DUAL-BRANCH COMBINED PLUNGER PUMP WITH BUILT-IN OIL CIRCUIT AND RIVETING TOOL

Abstract

The present disclosure discloses a dual-branch combined plunger pump with a built-in oil circuit and a riveting tool, and relates to the technical field of riveting tools. In a first aspect, a dual-branch combined plunger pump with a built-in oil circuit includes a pump body, a plunger is arranged in the pump body, a plunger chamber is arranged in the pump body, and an oil inlet is arranged on a wall surface. In a second aspect, a riveting tool includes a main body, a plunger port is arranged on the main body, and the main body is in a sealed connection with the above-mentioned dual-branch combined plunger pump with a built-in oil circuit on a wall surface. The present disclosure does require an oil pipe to connect the oil tank and the combined plunger pump, which effectively reduces the risk of oil leakage.

Claims

1. A dual-branch combined plunger pump with a built-in oil circuit, adapted for outputting oil to drive movement of a piston in a riveting work head, comprising a pump body (1), a plunger being arranged in the pump body (1), and a plunger chamber for the plunger to move being arranged in the pump body (1), wherein the pump body (1) is provided with an oil inlet (2) on a wall surface where an outlet of the plunger chamber is located, the oil inlet (2) is adapted to communicate with a crankshaft chamber (18) in a main body (17).

2. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 1, wherein the pump body (1) is provided with a boss (3) for embedding into the crankshaft chamber (18) in the main body (17), and the outlet of the plunger chamber and the oil inlet (2) are both arranged on the boss (3).

3. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 2, wherein an oil inlet channel (4) is arranged between the oil inlet (2) and the plunger chamber, the plunger chamber is communicated with an oil outlet channel, and an outlet of the oil outlet channel faces outward from the pump body (1) in a same direction as the oil inlet (2).

4. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 3, wherein the plunger comprises a high-pressure pump plunger (5) and a low-pressure pump plunger (6), the plunger chamber comprises a high-pressure chamber (7) for the high-pressure pump plunger to move and a low-pressure chamber (8) for the low-pressure pump plunger (6) to move, the oil inlet channel (4) is communicated with the low-pressure chamber (8), the oil outlet channel comprises a high-pressure oil outlet circuit (9) and a low-pressure oil outlet circuit (10), the low-pressure oil outlet circuit (10) is only communicated with the low-pressure chamber (8), and the low-pressure chamber (8) and the high-pressure chamber (7) are both communicated with the high-pressure oil outlet circuit (9).

5. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 4, wherein the outlet of the oil outlet channel comprises a low-pressure oil outlet (12) and a high-pressure oil outlet (11), the low-pressure oil outlet (12) is communicated with the low-pressure oil outlet circuit (10), the high-pressure oil outlet (11) is communicated with the high-pressure oil outlet circuit (9), and the low-pressure oil outlet (12) and the high-pressure oil outlet (11) are both located on a face of the pump body (1) on which the boss (3) is located.

6. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 5, wherein the oil inlet channel (4) is arranged with an oil inlet check valve (13) that allows oil to be transported only from the oil inlet (2) to the low-pressure chamber (8), the low-pressure oil outlet circuit (10) is arranged with a low-pressure pressurized oil check valve (14) that allows the oil to be transported only from the low-pressure chamber (8) to the low-pressure oil outlet (12), and the high-pressure oil outlet circuit (9) is arranged with a transition check valve (15) located between the low-pressure chamber (8) and the high-pressure chamber (7) that allows the oil to be transported only from the low-pressure chamber (8) to the high-pressure chamber (7), and a high-pressure pressurized oil check valve (16) located between the high-pressure chamber (7) and the high-pressure oil outlet (11) that allows the oil to be transported only from the high-pressure chamber (7) to the high-pressure oil outlet (11).

7. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 4, wherein the oil inlet (2) is located between an outlet of the high-pressure chamber (7) and an outlet of the low-pressure chamber (8) on the boss (3).

8. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 7, wherein the oil inlet channel (4) is arranged in parallel with the high-pressure chamber (7) and the low-pressure chamber (8), the oil inlet channel (4) is located between the high-pressure chamber (7) and the low-pressure chamber (8), and an end of the oil inlet channel (4) away from the oil inlet (2) is communicated with the low-pressure chamber (8).

9. The dual-branch combined plunger pump with a built-in oil circuit as claimed in claim 8, wherein an inner diameter of the low-pressure chamber (8) is larger than an inner diameter of the high-pressure chamber (7), and the low-pressure oil outlet circuit (10) and the high-pressure oil outlet circuit (9) are respectively located on opposite sides of an integrated structured formed by the low-pressure chamber (8), the oil inlet channel (4) and the high-pressure chamber (7).

10. A riveting tool, comprising a main body (17), wherein a crankshaft chamber (18) and an oil tank (20) are arranged in the main body (17), the oil tank (20) is communicated with the crankshaft chamber (18), a plunger port (19) for movement of a plunger is provided on a side face of the main body (17), the main body (17) is in a sealed connection with the dual-branch combined plunger pump with a built-in oil circuit as claimed in any one of claims 1 on a wall surface where the plunger port (19) is located, and the oil inlet (2) is communicated with the crankshaft chamber (18).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a schematic perspective view of a combined plunger pump in a first embodiment;

[0025] FIG. 2 is a schematic cross-sectional view of the combined plunger pump in the first embodiment;

[0026] FIG. 3 is a schematic cross-sectional view along line AA in FIG. 2;

[0027] FIG. 4 is a schematic exploded view of a riveting tool in the first embodiment; and

[0028] FIG. 5 is a schematic cross-sectional view of a crankshaft chamber of a main body mounted with a crankshaft and the combined plunger pump in the first embodiment.

[0029] Reference signs are as follows: 1, pump body; 2, oil inlet; 3, boss; 4, oil inlet channel; 5, high-pressure pump plunger; 6, low-pressure pump plunger; 7, high-pressure chamber; 8, low-pressure chamber; 9, high-pressure oil outlet circuit; 10, low-pressure oil outlet circuit; 11, high-pressure oil outlet; 12, low-pressure oil outlet; 13, oil inlet check valve; 14, low-pressure pressurized oil check valve; 15, transition check valve; 16, high-pressure pressurized oil check valve; 17, main body; 18, crankshaft chamber; 19, plunger port; 20, oil tank; 21, eccentric wheel; and 22, oil inlet gap.

DETAILED DESCRIPTION OF EMBODIMENTS

[0030] The present disclosure will be further described in detail below in conjunction with embodiments and accompanying drawings, but the embodiments of the present disclosure are not limited thereto.

[0031] In the description of the present disclosure, it should be noted that the terms center, up, down, left, right, vertical, longitudinal, lateral, horizontal, inside, outside, front, rear, top, bottom and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are merely for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present disclosure.

[0032] In the description of the present disclosure, it also should be noted that, unless otherwise clearly specified and limited, the terms disposed, opened, mounted, connected, and connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated structure; it may be a mechanical connection or an electrical connection; it may be a direct connection, or it may be indirectly connected through an intermediate medium, or it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

First Embodiment

[0033] In a first aspect, as shown in FIG. 1, a dual-branch combined plunger pump with a built-in oil circuit, adapted for outputting oil to drive a piston in a riveting work head to move, includes a pump body 1, a plunger is provided in the pump body 1, and a plunger chamber for the plunger to move is provided in the pump body 1. The pump body 1 is arranged with an oil inlet 2 on a wall surface where an outlet of the plunger chamber is located for communicating with a crankshaft chamber 18 on a main body 17. By arranging the oil inlet 2 on the wall surface where the outlet of the plunger chamber is located, the oil inlet 2 directly communicates with the crankshaft chamber 18, so that the oil in the crankshaft chamber 18 can directly enter the pump body 1 through the oil inlet 2. In the existing technology, the wall surface where the outlet of the plunger chamber is located is sealed with the main body 17, thus there is no need to set up an oil pipe to transport the oil in an oil tank to the pump body 1, which avoids oil leakage at the oil pipe, thereby effectively extending the service life of a riveting tool using the combined plunger pump. Moreover, since the oil intake of the pump body 1 is achieved through the pressure difference between the inside and outside of the pump body 1, the resistance of the oil circuit is proportional to the length of the path and inversely proportional to the cross-sectional area of the channel. When the oil pipe is communicated with the pump body 1, the oil inlet path of the pump body 1 is relatively long, and the oil inlet cross-section is relatively small, which will decrease the oil intake efficiency of the pump body 1. By removing the oil pipe and arranging the oil inlet 2 on the wall surface where the outlet of the plunger chamber is located, the length of the oil inlet path can be effectively reduced, thereby improving the oil intake efficiency of the pump body 1 and improving the overall volumetric efficiency of the hydraulic system under high-speed operation.

[0034] Specifically, as shown in FIG. 1, the pump body 1 is arranged with a boss 3 for embedding into the crankshaft chamber 18 on the main body 17, and the outlet of the plunger chamber and the oil inlet 2 are both located on the boss 3. Through the arrangement of the boss 3, a plane where the oil inlet 2 is located can be completely received within the crankshaft chamber 18, further avoiding the risk of oil leakage.

[0035] Specifically, as shown in FIG. 2, an oil inlet channel 4 is provided between the oil inlet 2 and the plunger chamber, and the plunger chamber is communicated with an oil outlet channel, and an outlet of the oil outlet channel faces outward from the pump body 1 in the same direction as the oil inlet 2. Through the arrangement of the oil outlet channel, the oil pressurized by the plunger in the plunger chamber can be transported to the main body 17, which is conducive to driving a riveting work head communicated with the main body 17.

[0036] Specifically, as shown in FIG. 3, the plunger includes a high-pressure pump plunger 5 and a low-pressure pump plunger 6, the plunger chamber includes a high-pressure chamber 7 for the movement of the high-pressure pump plunger 5 and a low-pressure chamber 8 for the movement of the low-pressure pump plunger 6. The oil inlet channel 4 is communicated with the low-pressure chamber 8. The oil outlet channel includes a high-pressure oil outlet channel 9 and a low-pressure oil outlet channel 10, the low-pressure oil outlet channel 10 is only communicated with the low-pressure chamber 8, and the low-pressure chamber 8 and the high-pressure chamber 7 are both communicated with the high-pressure oil outlet channel 9. Through the communication relationship between the high-pressure pump plunger 5, the low-pressure pump plunger 6, the high-pressure chamber 7, the low-pressure chamber 8, the high-pressure oil outlet channel 9, the low-pressure oil outlet channel 10, the oil inlet channel 4, the oil can enter the low-pressure chamber 8 from the oil inlet channel 4 and be pressurized by the low-pressure pump plunger 6 driven by the crankshaft, and the oil pressurized by the low-pressure pump plunger 6 enters the low-pressure oil outlet channel 10 and is discharged from the pump body 1 into the main body 17, alternatively, the oil pressurized by the low-pressure pump plunger 6 enters the high-pressure chamber 7 through the high-pressure oil outlet channel 9 and, after being further pressurized by the high-pressure pump plunger 5, is discharged through the high-pressure oil outlet channel 9 from the pump body 1 into the main body 17.

[0037] Specifically, as shown in FIG. 1, the outlet of the oil outlet channels includes a low-pressure oil outlet 12 and a high-pressure oil outlet 11, the low-pressure oil outlet 12 is communicated with the low-pressure oil outlet circuit 10, the high-pressure oil outlet 11 is communicated with the high-pressure oil outlet circuit 9, and the low-pressure oil outlet 12 and the high-pressure oil outlet 11 are both located on a side face of the pump body 1 arranged with the boss 3. By arranging the low-pressure oil outlet 12 and the high-pressure oil outlet 11 on the side face of the pump body 1 arranged with the boss 3, the low-pressure oil outlet 12 and the high-pressure oil outlet 11 can be closely fitted to the wall surface of the main body 17 and communicated with the oil channel in the main body 17 when the pump body 1 is mounted on the main body 17.

[0038] Specifically, as shown in FIG. 3, the oil inlet channel 4 is provided with an oil inlet check valve 13 that allows oil to be transported only from the oil inlet 2 to the low-pressure chamber 8, the low-pressure oil outlet circuit 10 is provided with a low-pressure pressurized oil check valve 14 that allows oil to be transported only from the low-pressure chamber 8 to the low-pressure oil outlet 12, and the high-pressure oil outlet circuit 9 is provided with a transition check valve 15 located between the low-pressure chamber 8 and the high-pressure chamber 7 that allows oil to be transported only from the low-pressure chamber 8 to the high-pressure chamber 7, and a high-pressure pressurized oil check valve 16 located between the high-pressure chamber 7 and the high-pressure oil outlet 11 that allows oil to be transported only from the high-pressure chamber 7 to the high-pressure oil outlet 11. Each check valve adopts a ball valve, which is composed of a spherical valve core and a spring (not shown). Four holding frames are evenly arranged in a rectangular array in the oil inlet channel 4. The four holding frames are parallel to each other, and outer walls of the spherical valve cores in the oil inlet channel 4 are respectively tangent to the four holding frames. The holding frames can prevent the spherical valve cores in the oil inlet channel 4 from wobbling. In addition, the holding frames allow the oil inlet check valve 13 to be reset as quickly as possible when it needs to be closed, so that the spherical valve cores in the oil inlet channel 4 can smoothly block the entrance of the oil inlet channel 4. A reset spring for ejecting the low-pressure pump plunger 6 out of the low-pressure chamber 8 is provided in the low-pressure chamber 8. As the crankshaft rotates, the crankshaft approaches the low-pressure pump plunger 6, while moving away from the high-pressure pump plunger 5, and the crankshaft moves away from the low-pressure pump plunger 6 while approaching the high-pressure pump plunger 5. The oil in each oil circuit in the pump body 1 flows in one direction through the check valves including the oil inlet check valve 13, the low-pressure oil check valve 14, the transition check valve 15, and the high-pressure oil check valve 16.

[0039] Specifically, as shown in FIG. 1, the oil inlet 2 is located between outlets of the high-pressure chamber 7 and the low-pressure chamber 8 on the boss 3. Since the high-pressure chamber 7 and the low-pressure chamber 8 need to be separated by a distance to separate the high-pressure chamber 7 and the low-pressure chamber 8, the space between the high-pressure chamber 7 and the low-pressure chamber 8 can be reasonably utilized by positioning the oil inlet 2 between the high-pressure chamber 7 and the low-pressure chamber 8. Compared with a configuration in which the oil inlet 2 is located outside the integrated structure formed by the high-pressure chamber 7 and the low-pressure chamber 8, the overall volume of the combined plunger pump can be significantly reduced.

[0040] An oil collecting groove is provided between the oil inlet channel 4 and the oil inlet 2, and a cross-sectional area of the oil collecting groove is larger than a cross-sectional area of the oil inlet channel 4. The oil collecting groove allows the length of the oil inlet channel 4 to be reduced, thereby reducing the resistance of the oil flow in the oil inlet channel 4, additionally, the weight of the pump body can be reduced.

[0041] Specifically, as shown in FIG. 2, the oil inlet channel 4 is arranged in parallel with the high-pressure chamber 7 and the low-pressure chamber 8, and the oil inlet channel 4 is located between the high-pressure chamber 7 and the low-pressure chamber 8. An end of the oil inlet channel 4 away from the oil inlet 2 is communicated with the low-pressure chamber 8. The design of the spatial relationship between the oil inlet channel 4, the high-pressure chamber 7 and the low-pressure chamber 8 facilitates the oil to enter the oil inlet channel 4 through a front side of the oil inlet 2.

[0042] Specifically, as shown in FIG. 2, an inner diameter of the low-pressure chamber 8 is larger than an inner diameter of the high-pressure chamber 7, and the low-pressure oil outlet circuit 10 and the high-pressure oil outlet circuit 9 are respectively located on opposite sides of the integrated structure composed of the low-pressure chamber 8, the oil inlet channel 4, and the high-pressure chamber 7. The low-pressure oil outlet circuit 10 is communicated with a bottom end of the low-pressure chamber 8, and a bottom end of the high-pressure chamber 7 and the bottom end of the low-pressure chamber 8 are both communicated with the high-pressure oil outlet circuit 9. Through the design of the relative size between the low-pressure chamber 8 and the high-pressure chamber 7, when the crankshaft rotates to output the same thrust to the high-pressure pump plunger 5 and the low-pressure pump plunger 6, the high-pressure chamber 7 can output oil with a higher pressure. Through the design of the spatial position of the low-pressure oil outlet circuit 10 and the high-pressure oil outlet circuit 9, the space of the integrated structure composed of the oil inlet channel 4, the low-pressure chamber 8, the high-pressure chamber 7, the low-pressure oil outlet circuit 10, and the high-pressure oil outlet circuit 9 can be reduced as much as possible, so that the volume of the pump body I can be reduced to save space.

[0043] In a second aspect, as shown in FIG. 4, a riveting tool includes a main body 17, an oil tank and a crankshaft chamber 18 are arranged in the main body 17, and the oil tank is communicated with the crankshaft chamber 18. A plunger port 19 for movement of the plunger is provided on a side face of the main body 17, and the main body 17 is sealed with the above-mentioned dual-branch combined plunger pump with a built-in oil circuit on a wall surface where the plunger port 19 is located. The oil inlet 2 is communicated with the crankshaft chamber 18. With the oil inlet 2 communicated with the crankshaft chamber 18, the path of the oil in the existing technology that passes through the oil tank, the oil pipe, and the pump body 1 in sequence is modified to a path passing through the oil tank, the crankshaft chamber 18, and the pump body 1. Since the main body 17 and the pump body 1 need to be sealed, the number of positions that need to be sealed is reduced by omitting the oil pipe, thereby reducing the risk of oil leakage.

[0044] Specifically, as shown in FIG. 5, a crankshaft is provided in the crankshaft chamber 18, and at least two eccentric wheels 21 are provided on the crankshaft along an axial direction thereof. An oil inlet gap 22 is provided between the two eccentric wheels 21, and the oil inlet gap 22 corresponds to the position of the oil inlet 2. The spatial relationship between the oil inlet gap 22 and the oil inlet 2 allows the eccentric wheels 21 to avoid the oil inlet 2, thereby preventing the eccentric wheels 21 from obstructing the oil inlet 2 during rotation, thus a smooth access to the oil inlet 2 is maintained in any state of the crankshaft.

[0045] The plunger port 19 has the same shape as the boss 3, and the boss 3 and the plunger port 19 are in an interference fitting. A sealing gasket sleeved outside the boss 3 is arranged between the pump body 1 and the main body 17. An oil tank communicated with the crankshaft chamber 18 is provided on the main body 17. Through the shape and size of the boss 3 and the plunger port 19, the pressure of the oil in the crankshaft chamber 18 applied to the pump body 1 is mainly on an end face of the boss 3 arranged with the oil inlet 2, rather than an end face of the pump body 1 with the boss 3, which ensures sealing effect of the end face of the pump body 1 arranged with the boss 3, so that the pressure of the oil in the gap between the end face of the pump body 1 arranged with the boss 3 and the main body 17 is small, thereby further improving the sealing effect between the pump body 1 and the main body 17, and preventing the oil from leaking from the gap where the pump body 1 is mounted.

[0046] The working principle of this embodiment is as follows: the boss 3 of the pump body 1 is embedded in the plunger port 19, so that the pump body 1 is in a sealed connection with the main body 17. The oil in the oil tank first enters the crankshaft chamber 18 and then directly enters the pump body 1 through the oil inlet 2. Low-pressure oil discharged from the low-pressure oil outlet 12 is the oil that sequentially passes through the oil inlet 2, the oil inlet channel 4, the low-pressure chamber 8, and the low-pressure oil outlet circuit 10. High-pressure oil discharged from the high-pressure oil outlet circuit 9 is the oil that sequentially passes through the oil inlet 2, the oil inlet channel 4, the low-pressure chamber 8, the high-pressure chamber 7, and the high-pressure oil outlet circuit 9. The discharge condition, discharge order, and discharge method of the high-pressure oil and the low-pressure oil can be adjusted according to the hydraulic system in which the combined plunger pump is applied. This belongs to the existing technology and will not be explained in detail herein.

[0047] The above description is merely a preferred embodiment of the present disclosure and should not be construed as imposing any limitation on the disclosure in any form. Based on the technical essence of the disclosure, any simple modifications, equivalent substitutions, or improvements made to the above embodiments within the spirit and principles of the disclosure shall still fall within the scope of protection of the technical solution of the present disclosure.