COOLING OR HEATING FLUID CIRCULATION SYSTEM of A CANTILEVERED CENTRIFUGAL PUMP

Abstract

A cooling or heating fluid circulation system of a cantilevered centrifugal pump, comprises a pump shaft, one end of which is connected with a vane wheel, a shaft sleeve sleeved on the periphery of the pump shaft, a left sealing gland and a right sealing gland, which are sleeved on the periphery of the shaft sleeve, are connected in sequence from one side of the vane wheel along the axial direction of the shaft sleeve; the gap between the left sealing gland and the said shaft sleeve is arranged with an inside rotating sealing ring fixed with the shaft sleeve and an inside stationary sealing ring fixed with the left sealing gland, an outside rotating sealing ring fixed with the shaft sleeve and an outside stationary sealing ring fixed with the right sealing gland are arranged in the gap between the right sealing gland and the shaft sleeve and away from the left sealing gland; a flow-restricted ring is arranged between the inner peripheral surface of the right sealing gland and the shaft sleeve; and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland and the shaft sleeve, the shaft sleeve and the pump shaft, is connected with an external heat exchanger via an external channel. The present invention is capable of directly cooling or heating the rotating parts which are most in need of cooling or heating, thus the temperature of the rotating parts can be kept in a certain range.

Claims

1. A cooling or heating fluid circulation system of the cantilevered centrifugal pump, comprises a pump shaft (7), one end of which is connected with a vane wheel (10), a shaft sleeve (11) sleeved on the periphery of the pump shaft (7), a left sealing gland (51) and a right sealing gland (52), which are sleeved on the periphery of the shaft sleeve (11), are connected in sequence from one end of the vane wheel (10) along the axial direction of the shaft sleeve (11); gaps are formed between the left sealing gland (51) and the said shaft sleeve (11) and between the right sealing gland (52) and the said shaft sleeve (11) respectively, the gap between the left sealing gland (51) and the said shaft sleeve (11) is arranged with an inside rotating sealing ring (12) fixed with the shaft sleeve (11) and an inside stationary sealing ring (13) fixed with the left sealing gland (51), an outside rotating sealing ring (17) fixed with the shaft sleeve (11) and an outside stationary sealing ring (18) fixed with the right sealing gland (52) are arranged in the gap between the right sealing gland (52) and the shaft sleeve (11) and away from the left sealing gland (51); wherein, a flow-restricted ring (16) is arranged between the inner peripheral surface of the right sealing gland (52) and the shaft sleeve (11); and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland (52) and the shaft sleeve (11), the shaft sleeve (11) and the pump shaft (7), is connected with an external heat exchanger (8) via an external channel (9); the heat exchange fluid therein is capable of rotating simultaneously with the rotating parts of the cantilevered centrifugal pump and flowing along the axial direction of rotating parts.

2. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 1, wherein the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel (201) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9); a second channel (202) is formed in the space between the right sealing gland (52) and the shaft sleeve (11), and is arranged within the space of one end of the flow-restricted ring (16) adjacent to the left sealing gland (51); a third channel (203) which is formed on the shaft sleeve (11); a fourth channel (204) formed between the peripheral surface of the pump shaft (7) and the inner peripheral surface of shaft sleeve (11); a fifth channel (205) formed on the shaft sleeve (11), is arranged within the space formed between the flow-restricted ring (16) on the right sealing gland (52) and one end of the outside rotating sealing ring (17) which is away from the outside stationary sealing ring (18); a sixth channel (206) formed between the outside rotating sealing ring (17) and the right sealing gland (52), is arranged with an outside pumping ring (19); and a seventh channel (207) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9).

3. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 2, wherein the fourth channel (204) is the channel formed by a plurality of sealing strips (20) arranged between the peripheral surface of the pump shaft (7) and the inner peripheral surface of shaft sleeve (11), said sealing strips (20) are embedded into the peripheral surface of the pump shaft (7) respectively.

4. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 2, wherein the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel (201) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9); a second channel (202) is formed in the space between the right sealing gland (52) and the shaft sleeve (11), and arranged within the space of one end of the flow-restricted ring (16) adjacent to the left sealing gland (51); a third channel (203) which is formed on the shaft sleeve (11); an eighth channel (208) formed inside the pump shaft (7); a ninth channel (209) formed between the pump shaft (7) and the shaft sleeve (11); a fifth channel (205) formed on the shaft sleeve (11), is arranged within the space formed between the flow-restricted ring (16) on the right sealing gland (52) and one end of the outside rotating sealing ring (17) which is away from the outside stationary sealing ring (18); a sixth channel (206) formed between the outside rotating sealing ring (17) and the right sealing gland (52), is arranged with an outside pumping ring (19); and a seventh channel (207) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9).

5. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 4, wherein the eighth channel (208) formed inside the pump shaft (7) comprises: a first longitudinal channel (2081) formed along the longitudinal direction of the pump shaft (7), one end of the first longitudinal channel (2081) is communicated with the third channel (203); an axial channel (2082) formed along the axial direction of the pump shaft (7), one end of which is communicated with the other end of the first longitudinal channel (2081); and a second longitudinal channel (2083) formed along the longitudinal direction of the pump shaft (7), one end of which is communicated with the other end of the axial channel (2082), whereas the other end is communicated with the ninth channel (209).

6. A cooling or heating fluid circulation system of the cantilevered centrifugal pump, comprises a pump shaft (7), one end of which is connected with a vane wheel (10), a shaft sleeve (11) sleeved on the periphery of the pump shaft (7), a left sealing gland (51) and a right sealing gland (52), which are sleeved on the periphery of the shaft sleeve (11), are connected in sequence from one end of the vane wheel (10) along the axial direction of the shaft sleeve (11); gaps are formed between the left sealing gland (51) and the said shaft sleeve (11) and between the right sealing gland (52) and the said shaft sleeve (11) respectively, the gap between the left sealing gland (51) and the said shaft sleeve (11) is arranged with an inside rotating sealing ring (12) fixed with the shaft sleeve (11) and an inside stationary sealing ring (13) fixed with the left sealing gland (51), an outside rotating sealing ring (17) fixed with the shaft sleeve (11) and an outside stationary sealing ring (18) fixed with the right sealing gland (52) are arranged in the gap between the right sealing gland (52) and the shaft sleeve (11) and away from the left sealing gland (51); wherein, the flow-restricted rotating sealing ring (14) fixed with the shaft sleeve (11) and the flow-restricted stationary sealing ring (15) fixed with the right sealing gland (52) are arranged in the gap between right sealing gland (52) and the shaft sleeve (11) and adjacent to the left sealing gland (51); the flow-restricted rotating sealing ring (14) is in contact connection with the flow-restricted stationary sealing ring (15), and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland (52) and the shaft sleeve (11), the shaft sleeve (11) and the pump shaft (7), is connected with an external heat exchanger (8) via an external channel (9); the heat exchange fluid therein is capable of rotating simultaneously with the rotating parts of the cantilevered centrifugal pump and flowing along the axial direction of rotating parts.

7. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 6, wherein the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel (201) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9); a second channel (202) is formed in the space between the right sealing gland (52) and the flow-restricted rotating sealing ring (14); a third channel (203), formed inside the shaft sleeve (11), is arranged within the space formed between one end of the flow-restricted rotating sealing ring (14) which is away from the flow-restricted stationary sealing ring (15) and the left sealing gland (51); a fourth channel (204) formed between the peripheral surface of the pump shaft (7) and the inner peripheral surface of shaft sleeve (11); a fifth channel (205), formed inside the shaft sleeve (11), is arranged within the space formed between the flow-restricted stationary sealing ring (15) on the right sealing gland (52) and one end of the outside rotating sealing ring (17) which is away from the outside stationary sealing ring (18); a sixth channel (206) formed between the outside rotating sealing ring (17) and the right sealing gland (52), is arranged with an outside pumping ring (19); and a seventh channel (207) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9).

8. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 7, wherein the fourth channel (204) is the channel formed by a plurality of sealing strips (20) arranged between the peripheral surface of the pump shaft (7) and the inner peripheral surface of shaft sleeve (11), said sealing strips (20) are embedded into the peripheral surface of the pump shaft (7) respectively.

9. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 6, wherein the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel (201) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9); a second channel (202) is formed in the space between the right sealing gland (52) and the flow-restricted rotating sealing ring (14); a third channel (203), formed inside the shaft sleeve (11), is arranged within the space formed between one end of the flow-restricted rotating sealing ring (14) which is away from the flow-restricted stationary sealing ring (15) and the left sealing gland (51); an eighth channel (208) formed inside the pump shaft (7); a ninth channel (209) formed between the peripheral surface of the pump shaft (7) and the inner peripheral surface of the shaft sleeve (11); a fifth channel (205) formed inside the shaft sleeve (11), is arranged within the space formed between the flow-restricted stationary sealing ring (15) on the right sealing gland (52) and one end of the outside rotating sealing ring (17) which is away from the outside stationary sealing ring (18); a sixth channel (206) formed between the outside rotating sealing ring (17) and the right sealing gland (52), is arranged with an outside pumping ring (19); and a seventh channel (207) formed on the right sealing gland (52), an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger (8) via the external channel (9).

10. The cooling or heating fluid circulation system of the cantilevered centrifugal pump according to claim 6, wherein the eighth channel (208) formed inside the pump shaft (7) comprises: a first longitudinal channel (2081) formed along the longitudinal direction of the pump shaft (7), one end of the first longitudinal channel (2081) is communicated with the third channel (203); an axial channel (2082) formed along the axial direction of the pump shaft (7), one end of which is communicated with the other end of the first longitudinal channel (2081); and a second longitudinal channel (2083) formed along the longitudinal direction of the pump shaft (7), one end of which is communicated with the other end of the axial channel (2082), whereas the other end is communicated with the ninth channel (209).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG. 1 shows an external structural diagram of a cantilevered centrifugal pump of the prior art;

[0042] FIG. 2 shows an inner structural diagram of a cantilevered centrifugal pump of the prior art;

[0043] FIG. 3 shows an external structural diagram of the first embodiment of a cantilevered centrifugal pump of the present invention;

[0044] FIG. 4 shows an inner structural diagram of the first embodiment of the cantilevered centrifugal pump of the present invention;

[0045] FIG. 5 shows an inner structural diagram of the second embodiment of the cantilevered centrifugal pump of the present invention;

[0046] FIG. 6 shows the structural diagram of the heat exchange fluid circulation channel of the periphery of the pump shaft of the first and second embodiments of the cantilevered centrifugal pump of the present invention;

[0047] FIG. 7 shows an inner structural diagram of the third embodiment of the cantilevered centrifugal pump of the present invention;

[0048] FIG. 8 shows an inner structural diagram of the fourth embodiment of the cantilevered centrifugal pump of the present invention; and

[0049] FIG. 9 shows the structural diagram of the heat exchange fluid circulation channel inside the pump shaft of the first and second embodiments of the cantilevered centrifugal pump of the present invention, in which: [0050] 1 support 2 pump casing [0051] 3 medium inlet 4 medium outlet [0052] 5 sealing gland 6 bearing seat [0053] 7 pump shaft 8 heat exchanger [0054] 9 external channel 10 vane wheel [0055] 11 shaft sleeve 12 inside rotating sealing ring [0056] 13 inside stationary sealing ring 14 flow-restricted rotating sealing ring [0057] 15 flow-restricted stationary sealing ring 16 flow-restricted ring [0058] 17 outside rotating sealing ring 18 outside stationary sealing ring [0059] 19 outside pumping ring 20 sealing strips [0060] 51 left sealing gland 52 right sealing gland [0061] 201 first channel 202 second channel [0062] 203 third channel 204 fourth channel [0063] 205 fifth channel 206 sixth channel [0064] 207 seventh channel 208 eighth channel [0065] 209 ninth channel 2081 first longitudinal channel [0066] 2082 axial channel 2083 second longitudinal channel

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] The cooling or heating fluid circulation system of a cantilevered centrifugal pump of the present invention will be described in detail with reference to the embodiments and the accompanying drawings.

[0068] The cooling or heating fluid circulation system of a cantilevered centrifugal pump is capable of directly providing cooling or heating fluid to the rotating parts of the high-temperature centrifugal pump which are most in need of cooling or heating. The technical scheme is as follows: by the mechanical sealing or flow restricting mechanism, a circulating fluid with initial temperature flows from external into the rotating part via the stationary component of the pump, the fluid is capable of rotating simultaneously with the rotating part and flowing along the axial direction of the rotating part to the core position where most in need of cooling or heating. After performing sufficient heat exchange, fluid continuously flows out of the rotating part and takes the heat away from the rotating part, and the fluid passes from the inner pump to the external channel for heat exchange outside the pump, and the temperature returns back to the initial temperature, and then the cooled fluid flows into the rotating part of the pump for circulation again, and the heat exchange continuous with the circulation to achieve the purpose of controlling the temperature of rotating parts of the centrifugal pump.

[0069] As shown in FIG. 3, FIG. 4 and FIG. 7, the cooling fluid circulation system of the cantilevered centrifugal pump, comprises a pump shaft 7, one end of which is connected with a vane wheel 10, a shaft sleeve 11 sleeved on the periphery of the pump shaft 7, a left sealing gland 51 and a right sealing gland 52, which are sleeved on the periphery of the shaft sleeve 11, are connected in sequence from one end of the vane wheel 10 along the axial direction of the shaft sleeve 11; gaps are formed between the left sealing gland 51 and the said shaft sleeve 11 and between the right sealing gland 52 and the said shaft sleeve 11 respectively, the gap between the left sealing gland 51 and the said shaft sleeve 11 is arranged with an inside rotating sealing ring 12 fixed with the shaft sleeve 11 and an inside stationary sealing ring 13 fixed with the left sealing gland 51, an outside rotating sealing ring 17 fixed with the shaft sleeve 11 and an outside stationary sealing ring 18 fixed with the right sealing gland 52 are arranged in the gap between the right sealing gland 52 and the shaft sleeve 11 and away from the left sealing gland 51; a flow-restricted ring 16 is arranged between the inner peripheral surface of the right sealing gland 52 and the shaft sleeve 11; and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland 52 and the shaft sleeve 11, the shaft sleeve 11 and the pump shaft 7, is connected with an external heat exchanger 8 via an external channel 9; the heat exchange fluid therein is capable of rotating simultaneously with the rotating parts of the cantilevered centrifugal pump and flowing along the axial direction of rotating parts.

[0070] As shown in FIG. 4, the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel 201 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9; a second channel 202 is formed in the space between the right sealing gland 52 and the shaft sleeve 11, and is arranged within the space of one end of the flow-restricted ring 16 adjacent to the left sealing gland 51; a third channel 203 which is formed on the shaft sleeve 11; a fourth channel 204 formed between the peripheral surface of the pump shaft 7 and the inner peripheral surface of shaft sleeve 11; a fifth channel 205 formed on the shaft sleeve 11, is arranged within the space formed between the flow-restricted ring 16 on the right sealing gland 52 and one end of the outside rotating sealing ring 17 which is away from the outside stationary sealing ring 18; a sixth channel 206 formed between the outside rotating sealing ring 17 and the right sealing gland 52, is arranged with an outside pumping ring 19; and a seventh channel 207 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9.

[0071] As shown in FIG. 6, the fourth channel 204 is the channel formed by a plurality of sealing strips 20 arranged between the peripheral surface of the pump shaft 7 and the inner peripheral surface of shaft sleeve 11, said sealing strips 20 are embedded into the peripheral surface of the pump shaft 7 respectively.

[0072] As shown in FIG. 7, the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel 201 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9; a second channel 202 is formed in the space between the right sealing gland 52 and the shaft sleeve 11, and arranged within the space of one end of the flow-restricted ring 16 adjacent to the left sealing gland 51; a third channel 203 which is formed on the shaft sleeve 11; an eighth channel 208 formed inside the pump shaft 7; a ninth channel 209 formed between the peripheral surface of the pump shaft 7 and the inner peripheral surface of the shaft sleeve 11; a fifth channel 205 formed on the shaft sleeve 11, is arranged within the space formed between the flow-restricted ring 16 on the right sealing gland 52 and one end of the outside rotating sealing ring 17 which is away from the outside stationary sealing ring 18; a sixth channel 206 formed between the outside rotating sealing ring 17 and the right sealing gland 52, is arranged with an outside pumping ring 19; and a seventh channel 207 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9.

[0073] As shown in FIG. 9, the eighth channel 208 formed inside the pump shaft 7 comprises: a first longitudinal channel 2081 formed along the longitudinal direction of the pump shaft 7, one end of the first longitudinal channel 2081 is communicated with the third channel 203; an axial channel 2082 formed along the axial direction of the pump shaft 7, one end of which is communicated with the other end of the first longitudinal channel 2081; and a second longitudinal channel 2083 formed along the longitudinal direction of the pump shaft 7, one end of which is communicated with the other end of the axial channel 2082, whereas the other end is communicated with the ninth channel 209.

[0074] As shown in FIG. 3, FIG. 5 and FIG. 8, in another exemplary embodiment, the cooling or heating fluid circulation system of a cantilevered centrifugal pump, comprises a pump shaft 7, one end of which is connected with a vane wheel 10, a shaft sleeve 11 sleeved on the periphery of the pump shaft 7, a left sealing gland 51 and a right sealing gland 52, which are sleeved on the periphery of the shaft sleeve 11, are connected in sequence along the axial direction of the shaft sleeve 11; gaps are formed between the left sealing gland 51 and the said shaft sleeve 11 and between the right sealing gland 52 and the said shaft sleeve 11 respectively, the gap between the left sealing gland 51 and the said shaft sleeve 11 is arranged with an inside rotating sealing ring 12 fixed with the shaft sleeve 11 and an inside stationary sealing ring 13 fixed with the left sealing gland 51, an outside rotating sealing ring 17 fixed with the shaft sleeve 11 and an outside stationary sealing ring 18 fixed with the right sealing gland 52 are arranged in the gap between the right sealing gland 52 and the shaft sleeve 11 and away from the left sealing gland 51; wherein, a flow-restricted rotating sealing ring 14 fixed with the shaft sleeve 11 and a flow-restricted stationary sealing ring 15 fixed with the right sealing gland 52 are arranged in the gap between right sealing gland 52 and the shaft sleeve 11 and adjacent to the left sealing gland 51; the flow-restricted rotating sealing ring 14 is in contact connection with the flow-restricted stationary sealing ring 15, and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland 52 and the shaft sleeve 11, the shaft sleeve 11 and the pump shaft 7, is connected with an external heat exchanger 8 via an external channel 9; the heat exchange fluid therein is capable of rotating simultaneously with the rotating parts of the cantilevered centrifugal pump and flowing along the axial direction of rotating parts.

[0075] As shown in FIG. 5, in another exemplary embodiment, the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel 201 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9; a second channel 202 is formed in the space between the right sealing gland 52 and the flow-restricted rotating sealing ring 14; a third channel 203, formed inside the shaft sleeve 11, is arranged within the space formed between one end of the flow-restricted rotating sealing ring 14 which is away from the flow-restricted stationary sealing ring 15 and the left sealing gland 51; a fourth channel 204 formed between the peripheral surface of the pump shaft 7 and the inner peripheral surface of shaft sleeve 11; a fifth channel 205, formed inside the shaft sleeve 11, is arranged within the space formed between the flow-restricted stationary sealing ring 15 on the right sealing gland 52 and one end of the outside rotating sealing ring 17 which is away from the outside stationary sealing ring 18; a sixth channel 206 formed between the outside rotating sealing ring 17 and the right sealing gland 52, is arranged with an outside pumping ring 19; and a seventh channel 207 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9.

[0076] As shown in FIG. 6, wherein the fourth channel 204 is the channel formed by a plurality of sealing strips 20 arranged between the peripheral surface of the pump shaft 7 and the inner peripheral surface of shaft sleeve 11, said sealing strips 20 are embedded into the peripheral surface of the pump shaft 7 respectively.

[0077] As shown in FIG. 8, in another exemplary embodiment, the heat exchange fluid circulation channel comprises the following channels communicated in sequence: a first channel 201 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9; a second channel 202 is formed in the space between the right sealing gland 52 and the flow-restricted rotating sealing ring 14; a third channel 203, formed inside the shaft sleeve 11, is arranged within the space formed between one end of the flow-restricted rotating sealing ring 14 which is away from the flow-restricted stationary sealing ring 15 and the left sealing gland 51; an eighth channel 208 formed inside the pump shaft 7; a ninth channel 209 formed between the peripheral surface of the pump shaft 7 and the inner peripheral surface of the shaft sleeve 11; a fifth channel 205 formed inside the shaft sleeve 11, is arranged within the space formed between the flow-restricted stationary sealing ring 15 on the right sealing gland 52 and one end of the outside rotating sealing ring 17 which is away from the outside stationary sealing ring; a sixth channel 206 formed between the outside rotating sealing ring 17 and the right sealing gland 52, is arranged with an outside pumping ring 19; and a seventh channel 207 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9.

[0078] As shown in FIG. 9, the eighth channel 208 formed inside the pump shaft 7 comprises: a first longitudinal channel 2081 formed along the longitudinal direction of the pump shaft 7, one end of the first longitudinal channel 2081 is communicated with the third channel 203; an axial channel 2082 formed along the axial direction of the pump shaft 7, one end of which is communicated with the other end of the first longitudinal channel 2081; and a second longitudinal channel 2083 formed along the longitudinal direction of the pump shaft 7, one end of which is communicated with the other end of the axial channel 2082, whereas the other end is communicated with the ninth channel 209.

[0079] The first embodiment (as shown in FIG. 4) working process of the cooling or heating fluid circulation system of a cantilevered centrifugal pump of the present invention is: the fluid for heat exchanging inside the cantilevered centrifugal pump passes through the heat exchanger 8 via the external channel 9, and passes in sequence of the following communicated channels: the first channel 201 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9; the second channel 202 formed in the space between the right sealing gland 52 and the shaft sleeve 11, and is arranged within the space of one end of the flow-restricted ring 16 adjacent to the left sealing gland 51; the third channel 203 which is formed on the shaft sleeve 11; the fourth channel 204 formed between the peripheral surface of the pump shaft 7 and the inner peripheral surface of shaft sleeve 11; the fifth channel 205 formed on the shaft sleeve 11, is arranged within the space formed between the flow-restricted ring 16 on the right sealing gland 52 and one end of the outside rotating sealing ring 17 which is away from the outside stationary sealing ring 18; the sixth channel 206 formed between the outside rotating sealing ring 17 and the right sealing gland 52, is arranged with an outside pumping ring 19; and the seventh channel 207 formed on the right sealing gland 52, an external end of which is connected with the liquid inlet or liquid outlet of the heat exchanger 8 via the external channel 9. The fluid performs heat exchange with the rotating part inside the cantilevered centrifugal pump, in particularly performs heat exchange with the pump shaft 7, and the heat exchanged fluid flows out of the seventh channel 207 inside the right sealing gland 52 and flows through the heat exchanger 8 via the external channel 9 for heat exchange, and then the fluid flows into the first channel 201 in the right sealing gland 52 through the external channel 9 again for heat exchange with the rotating part inside the pump. This fluid circulation achieves the heat exchange of the rotating part of the cantilevered centrifugal pump. By arranging the flow-restricted ring 16 between the liquid inlet and liquid outlet of the right sealing gland 52, the fluid flowed into the cantilevered centrifugal pump via the fluid inlet of the heat exchange fluid circulation channel is capable of flowing in the designed heat exchange fluid circulation channel, and flowing out via the fluid outlet of the heat exchange fluid circulation channel after circulation. Thus, the fluid eliminates the absence of heat exchange, i.e., avoid the fluid flowing into the fluid inlet and immediately flowing out of the fluid outlet. Furthermore, using the flow-restricted ring instead of mechanical sealing method has the advantages of saving axial space, simplifying the structure, reducing the costs, shortening the processing cycle, etc.

[0080] The working process of the second embodiment of the cooling fluid circulation system of the cantilevered centrifugal pump as shown in FIG. 5 is similar to the first embodiment thereof as shown in FIG. 4. Only one difference in that the flow-restricted rotating sealing ring 14 and the flow-restricted stationary sealing ring 15 are arranged in the gap between right sealing gland 52 and the shaft sleeve 11 in the second embodiment. By arranging a set of throttle mechanical sealing equipment between the liquid inlet and liquid outlet of the right sealing gland 52, the flow-restricted rotating sealing ring 14 and the flow-restricted stationary sealing ring 15 are capable of arranging the fluid flowed into the cantilevered centrifugal pump via the fluid inlet of the heat exchange fluid circulation channel flowing in the designed heat exchange fluid circulation channel, and flowing out via the fluid outlet of the heat exchange fluid circulation channel after circulation. Thus, the fluid eliminates the absence of heat exchange, i.e., avoid the fluid flowing into the fluid inlet and immediately flowing out of the fluid outlet.

[0081] The working processes of the third and fourth embodiments of the cooling fluid circulation system of the cantilevered centrifugal pump as shown in FIG. 7 and FIG. 8 are similar to the first and second embodiments thereof. Only one difference in that the fluid for heat exchange flows inside the pump shaft 7 and performs heat exchange in the pump shaft 7 in the third and fourth embodiments. Whereas the fluid for heat exchange flows on the surface of the pump shaft 7 and performs heat exchange in the pump shaft 7 in the first and second embodiments.

[0082] In the whole circulation, restricted by oil refining and chemical process, the temperature of fluid feeding material transmitted by the centrifugal pump is constant, i.e., the feeding material transmits the heat to the rotating part requiring a certain time, the rotating part of the centrifugal pump of the present invention performs a new heat exchange with the cooling liquid flowing through the centrifugal pump when the temperature of the rotating part has not yet changed. Therefore, the temperature of the rotating part can always be controlled within a desired range.