Adjustable jet valve

Abstract

An adjustable jet valve includes a valve body containing a cold water opening, a hot water opening and a mixed water opening for outputting mixed water; a spray nozzle arranged in the valve body includes a cold water inlet and a cold water outlet connected to a cold water channel of a valve by means of the cold water opening; a spray needle assembled inside the spray nozzle forms a cold water inflow space with an inner chamber of the spray nozzle, and forms a cold water spray outlet with the cold water outlet of the spray nozzle; and a throat pipe connected to the mixed water opening of the valve body for guiding the mixed water to flow into a device using mixed water.

Claims

1. An adjustable jet valve, comprising: a valve body, provided with a cold water port, a hot water port and a mixing outlet for mixed water disposed thereon; a nozzle disposed in said valve body, having a cold water inlet communicated with a cold water passage of a valve through said cold water port, and a cold water outlet; a needle assembled in said nozzle, forming a cold water inflow space with an inner cavity of said nozzle, and forming a cold water jetting outlet with said cold water outlet; and a throat pipe disposed in connection with said mixing outlet of said valve body, adapted for discharging mixed water; a rotatable member rotatably disposed in said valve body in a sealing manner; said rotatable member being axially movable relative to said nozzle and fitted therewith through an axially adjusting mechanism, so as to displace said nozzle in the axial direction of said needle by the rotation of said rotatable member; wherein said needle is unmovable in the axial direction of said adjustable jet valve; said nozzle is movable in the axial direction of said adjustable jet valve; and fluid flow rates of said cold water inflow space, said hot water port and said cold water jetting outlet are adjusted simultaneously through axially adjusting said nozzle; and wherein said rotatable member is in connection with said needle, so as to actuate said needle to rotate simultaneously; said valve body is coordinated with said nozzle through a rotation limiting part, adapted for stopping said nozzle to rotate relative to said valve body when said needle is rotated by said rotatable member.

2. The adjustable jet valve according to claim 1, wherein said axially adjusting mechanism comprises an internal thread formed on said nozzle and an external thread formed on said rotatable member and adapted for being engaged with said internal thread; and the stroke for engagement of said internal thread and said external thread is no less than the working stroke of said nozzle.

3. The adjustable jet valve according to claim 1, wherein said rotation limiting part is a polygonal end portion formed on said nozzle, and the inner wall of said valve body is fitted therewith.

4. The adjustable jet valve according to claim 1, wherein said rotation limiting part comprises a flange and/or a guiding groove circumferentially arranged in the external wall of said nozzle, and a guiding groove and/or a flange axially arranged in the inner wall of said valve body fitted therewith.

5. The adjustable jet valve according to claim 4, wherein said cold water inlet and said cold water outlet of said nozzle have a pair of circumferential flanges formed therebetween extending radially outward, and said circumferential flanges allow a sealing element to be disposed therebetween, and a hot water segment of said nozzle located between said circumferential flanges and said cold water outlet is able to be communicated with a hot water passage of the valve.

6. The adjustable jet valve according to claim 1, wherein said throat pipe is assembled in said valve body formed said hot water port thereon in connection with the hot water passage and said throat pipe, and said throat pipe comprises a path pipe and an expanding pipe.

7. The adjustable jet valve according to claim 6, wherein said path pipe has an inner diameter between 5 mm and 14 mm, and the length of said path pipe is 5 to 8 times of said inner diameter.

8. The adjustable jet valve according to claim 6, wherein said expanding pipe has an expanding angle (?) between 5? and 15?.

9. The adjustable jet valve according to claim 8, wherein said expanding pipe is expanding gradually from its small end to its big end.

10. The adjustable jet valve according to claim 9, wherein said expanding pipe expands in three steps manner.

11. The adjustable jet valve according to claim 1, wherein said needle comprises a needle body and a conical portion located on one end of said needle body and coordinated with said cold water outlet of said nozzle; said needle body is circumferentially provided with a supporting member so as to allow outer surface of said supporting member to coordinate with the inner cavity of said nozzle, in order to limit the position of said needle body and to form a fluid passage on said supporting member, as said needle is disposed inside said nozzle.

12. The adjustable jet valve according to claim 11, wherein said supporting member comprises a plurality of ribs circumferentially and uniformly arranged around said needle body in the axial direction, and said fluid passage is formed between said ribs.

13. The adjustable jet valve according to claim 12, wherein said rib comprises a first rib part and a second rib part; said first rib part is arranged towards said cold water inlet of said nozzle and has a radial dimension smaller than that of said second rib part, so as to coordinate with said inner wall of said nozzle to form said fluid passage, and the outer surface of said second rib part is fitted with the inner cavity of said nozzle.

14. The adjustable jet valve according to claim 12, wherein the number of said ribs is three or four or five or six; the sum of the cross section of all fluid passages formed between said ribs is larger than the cross section of said cold water outlet of said nozzle.

15. The adjustable jet valve of claim 11, wherein a water pressurizing and mixing segment is disposed between said conical portion and said supporting member of said needle body, and the shape of said water pressurizing and mixing segment is a cylinder.

16. The adjustable jet valve according to claim 15, wherein the diameter of said water pressurizing and mixing segment is larger than, equal to or slightly smaller than the diameter of a spout of said nozzle.

17. The adjustable jet valve according to claim 16, wherein the diameter of said conical portion declines from its root to its front end, the taper of which is between 10? and 150? and the length of said conical portion is smaller than or equal to the movable stroke of said nozzle.

18. The adjustable jet valve according to claim 1, wherein when said nozzle is displaced in the axial direction of said adjustable jet valve, the pressure of cold water of said cold water inlet disposed thereon is always consistent with the pressure of cold water of said cold water port disposed on said valve body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Detailed description will be given below in conjunction with accompanying drawings:

(2) FIG. 1 is a perspective diagram of an adjustable jet valve of the present invention;

(3) FIG. 2 is a sectional view of an adjustable jet valve of the present invention;

(4) FIG. 3 is a structural diagram of the combination between the nozzle and the needle of the present invention;

(5) FIG. 4 is a perspective diagram of the nozzle of the present invention;

(6) FIG. 5 is a perspective structural diagram of the needle of the present invention;

(7) FIG. 6 is a sectional view of the perspective structure of the nozzle of the present invention;

(8) FIG. 7 is a diagram of one embodiment of the expanding pipe of the throat pipe of the present invention;

(9) FIG. 8 is a diagram of another embodiment of the expanding pipe of the throat pipe of the present invention.

(10) In the drawings, the following reference numbers are used:

(11) 1needle body, 1awater pressurizing and mixing segment, 2conical portion, 2aroot, 2bfront end, 3fluid passage, 4rib, 41first rib part, 42second rib part, 9nozzle, 91nozzle inlet for cold water, 92cold water outlet, 93polygonal end portion, 94circumferential flange, 95hot water segment, 96nozzle conical portion, 11throat pipe, 11apath pipe, 11bexpanding pipe, 12valve body, 12aopening for hot water, 12bopening for cold water, 13rotatable member, 15cold water inflow space, 16cold water jetting outlet, ?expanding angle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(12) The embodiments of this invention will be illustrated in detail in combination with the accompanying figures as below. It should be understood that the embodiments described here are used to illustrate this invention rather than limit the scope of this invention.

(13) FIG. 1 and FIG. 2 show an embodiment of an adjustable jet valve adapted for being mounted in a valve, comprising a valve body 12 provided with a cold water port 12b, a hot water port 12a and a mixing outlet for mixed water disposed thereon, wherein said cold water port 12b is adapted for communicating with a cold water passage of the valve, and said hot water port 12a is in connection with an outlet for hot water of a hot water passage of the valve and said mixing outlet is adapted for discharging mixture of hot water and cold water. The adjustable jet valve further comprises a nozzle 9 disposed within the valve body, having a cold water inlet and a cold water outlet, wherein the cold water inlet is in connection with the cold water passage of the valve through the cold water port 12b. The adjustable jet valve further comprises a needle assembled in the nozzle, together with the inner cavity of the nozzle to form a cold water inflow space 15 as well as together with the cold water outlet to form a cold water jetting outlet 16; a throat pipe in connection with the mixing outlet of the valve body, in order to discharge the mixed water.

(14) Furthermore, the needle is unmovable in the axial direction of the adjustable jet valve, while the nozzle is adjustable in the axial direction of the adjustable jet valve. The cold water inflow space 15, the hot water port and the cold water jetting outlet 16 may be adjusted simultaneously by adjusting the nozzle in the axial direction. Specifically, the working principle will be explained as follows. The distance between the needle and the throat pipe 11 is fixed, and the nozzle 9 is adjustable in the axial direction between the needle and the throat pipe 11. When the nozzle moves towards the tip of the needle, the cold water inflow is decreased while the hot water inflow is increased, so as to increase the temperature of the mixed water; when the nozzle moves towards the throat pipe 11, the cold water inflow is increased while the hot water inflow in decreased, so as to decrease the temperature of the mixed water.

(15) Hence, when using the adjustable jet valve of the present embodiment, people only need to axially adjust the nozzle 9 so as to adjust the cold water inflow space 15, the hot water port 12a and the cold water jetting outlet 16 simultaneously. It solves the problem of the adjustable jet valve of prior art, i.e. for getting mixed water with comfortable temperature, both of the needle and the nozzle are required to be adjusted, which is quite difficult for the users and prone to be mishandled.

(16) In addition, in this embodiment, refer to FIG. 2, when the nozzle 9 is displacing in the axial direction of the jet valve, the cold water pressure of the cold water inlet 91 disposed thereon is kept the same with the cold water pressure of the cold water port 12b disposed on the valve body 12, which may be realized in two following methods.

(17) The length of the cold water inlet 91 in the axial direction of the needle may be larger than or equal to the length of the cold water port 12b in the axial direction plus the stroke of the nozzle 9, so that the cold water port 12b may be kept within the length range of the cold water inlet 91 during the displacement of the nozzle 9, in order to keep the pressure for jetting cold water from the inner of the nozzle.

(18) Alternatively, the length of the cold water port 12b in the axial direction of the needle may be larger or equal to the length of the cold water inlet 91 in the axial direction plus the stroke of the nozzle 9, so that the cold water inlet 91 may be kept within the length range of the cold water port 12b during the displacement of the nozzle 9, in order to keep the pressure for jetting cold water from the inner of the nozzle.

(19) The pressure of the cold water port 12b may be ensured to keep the same with that at the cold water outlet 16 via the two above described methods, avoiding the pressure of the cold water inlet from being lower than that of the cold water jetting outlet 16 during the axial displacement of nozzle 9 of prior art. In the prior technology, if the pressure of the cold water inlet is lower than that of the cold water jetting outlet 16, due to the structural limitation of the valve itself, people have to adjust the needle in the axial direction again to make the pressure of the cold water outlet 16 be greater or equal to that of the cold water inlet of the nozzle 9, thus making the cold water be jetted normally.

(20) In order to facilitate the adjustment of the nozzle 9 in the axial direction of the valve body 12 much more conveniently, furthermore, the adjustable jet valve provided in the present embodiment further comprises a rotatable member 13 for facilitating displacing the nozzle 9 in the axial direction, which is sealed through an O-shaped ring and the like and rotatably disposed on the valve body 12. Additionally, the rotatable member 13 is displaced relative to the nozzle 9 in the axial direction through an axially adjusting mechanism (described later), so as to axially displacing the nozzle 9 via the rotation of the rotatable member 13.

(21) Specifically, for example, the axially adjusting mechanism may be racks and gears fitted with each other for transmission, i.e. the racks are arranged on the nozzle 9 so as to axially displace the nozzle 9 through the gearing of the rotatable member 13 and the gears.

(22) As a preferred embodiment, refer to FIG. 1 and FIG. 2, the rotatable member 13 is in connection with the needle so as to drive the needle to rotate together. More specifically, for easier process, an internal threaded hole is formed at the end of the rotatable member 13 that is in connection with the needle, and an external thread is arranged at the end of the needle, so that the rotatable member 13 and the needle may be fitted with each other through the threads. Alternatively, the rotatable member 13 and the needle may be formed integrally.

(23) Meanwhile, the valve body 12 is fitted with the nozzle 9 through a rotation limiting part (described in details later), so that the nozzle 9 cannot rotate relative to the valve body 12 during the rotation of needle driven by the rotatable member 13. However, the nozzle 9 may be displaced relative to the valve body 12 in the axial direction of the needle driven by the axially adjusting mechanism.

(24) Specifically, the axially adjusting mechanism may comprise an internal thread and an external thread, wherein said internal thread is formed on the end of the nozzle 9 that is fitted with the rotatable member 13, and the external thread is formed on the rotatable member 13, adapted for fitting with the internal thread; wherein the engaging stroke of the internal thread and the external thread may be greater than or equal to the movable stroke of the nozzle, which is, when the nozzle 9 is in the position where the cold water passage is closed, shown in FIG. 2, the distance between the cold water outlet 92 and the throat pipe 11. Refer to FIG. 1 and FIG. 2, the needle is driven to rotate in the inner cavity of nozzle 9 by the rotation of the rotatable member 13, and the rotation limiting part may obstruct the nozzle 9 from rotating relative to the valve body 12. Meanwhile, because the nozzle 9 is fitted with the rotatable member 13 by the threads, it may cause the reciprocating motion of the nozzle 9 in the axial direction of the needle with the threads, so as to adjust the cold water inflow space 15, the hot water port 12a (shown in FIG. 2) and the jet outlet of cold water 16 simultaneously, which is quite convenient.

(25) Additionally, for the mechanism adapted for driving the needle to rotate through the rotatable member 13, the axially adjusting mechanism may be designed in various ways. For example, the axially adjusting mechanism may comprise skew gears and racks fitted with each other, adapted for displacing the racks through the rotation of the skew gears, i.e. the nozzle 9 is moving in the axial direction of the needle through rotatable member 13 on which the skew gears are arranged, and the racks are arranged on the nozzle 9 rotatable member.

(26) For driving the needle to rotate by the rotatable member 13, and displacing the nozzle 9 relative to the valve body 12 in the axial direction of the needle through the axially adjusting mechanism 7 without rotation, a rotation limiting part is provided in the present embodiment. The valve body 12 is fitted with the nozzle through the rotation limiting part, so as to displace the nozzle relative to the valve body in the axial direction of the needle through the axially adjusting mechanism, but not rotate relative to the valve body when the needle is driven to rotate by the rotatable member. It is disclosed in a preferred embodiment that the rotation limiting part is a polygonal end portion formed on the nozzle, shown in FIG. 4. Correspondingly, the inner wall of the valve body is shaped so as to be coordinated with the polygonal end portion, so that when the external thread of the rotatable member 13 is fitted with the internal thread of the nozzle 9, the nozzle 9 may be displaced in the axial direction of the needle without rotation due to the restriction of the rotation limiting part.

(27) As an alternative embodiment, the rotation limiting part comprises a flange arranged on the inner wall of the valve body and a guiding groove arranged on the side of the nozzle in the axial direction that is sliding fitted with the flange. It should be understood that the rotation limiting part might also be designed in various ways. For example, it can be a guiding groove arranged on the inner wall of the valve body as well as a flange arranged on the side of the nozzle in the axial direction which may be sliding fitted with the guiding groove.

(28) Refer to FIG. 3 and FIG. 4, it is provided in the present embodiment that a pair of circumferential flanges extend outward radially are formed between the cold water inlet and the cold water outlet, and a hot water segment of the nozzle located between the circumferential flanges and the cold water outlet may be connected with the hot water passage of the valve, so that the hot water port 12a may be separated from the cold water inlet 91 and the cold water port 12b, which disposed in the valve body 12 and connected with the cold water inlet 91, for better jet effects of the adjustable jet valve provided in the present invention. For entirely separating the cold water port 12b from the hot water port 12a to get a better sealing, during the assembly process, a sealing member is disposed between the circumferential flanges, adapted for making the surface of the circumferential flanges tightly fit with the inner wall of the nozzle 9, such as a sealing ring, so as to get better effects of sealing.

(29) Refer to FIG. 1 and FIG. 2, it is provided in the present embodiment that the throat pipe 11 is disposed in the valve body 12, and the valve body is provided with a hot water port formed thereon which is in connection with a hot water passage and the throat pipe. The throat pipe 11 is adapted for intensively mixing the hot water and the cold water and exchanging energy. The throat pipe 11 comprises a path pipe 11a and an expanding pipe 11b. In the present embodiment, the path pipe has an inner diameter between 5 mm and 14 mm, preferably between 6 mm and 10 mm. However, it should be understood that the inner diameter of the path pipe should not be limited within such range, which may be within a larger range according to various requirements. In the present embodiment, the inner diameter of the path pipe 11a is 8 mm. The length of the path pipe may be 5-8 times of the inner diameter, preferred 6 times.

(30) Refer to FIG. 7, it is provided in the present embodiment that the expanding pipe 11b is adapted for converting part of the kinetic energy of the mixed water into pressure energy, the mixed water coming from the outlet of the throat pipe 11. During such energy conversion, there may be diffusion losses and its amount is relevant to the distribution of the inflow speed of the inlet of the expanding pipe 11b, the expanding angle and the ratio of the diameters of the cross section of the expanding. As a preferred embodiment, the expanding angle is between 5? and 15?, but not restricted within that range, preferred 12?. In the present embodiment, the expanding pipe 11b preferably expands in a continuous linear manner. However, it also can expand in various manners such as stepped continuous manner without any restriction of the specification forms. Furthermore, in the present embodiment, the expanding pipe 11b expands from its smaller opening to its larger opening continuously. It is preferred that the expanding pipe 11b comprises three sections, shown in FIG. 8, and the expanding angle ? of each section is preferred to be 2?, 4?, 13? respectively. Alternatively, the angle also can be 1?, 3?, 12?, or other various angles fitted therewith according to different working requirements.

(31) It is provided in the present embodiment that the cold water outlet of the nozzle 9 has a diameter between 3 mm and 10 mm, preferred between 4 mm and 6 mm. However, the protection scope of this invention may not be restricted within such range. In this embodiment, the diameter is 5 mm.

(32) When the pressure of the fluid with an instable flow velocity passing through the cold water inlet 91 is great, the needle provided in the present invention may not be affected and still have better jet effects. In order to achieve this effects, in the present embodiment shown in FIG. 1, FIG. 2 and FIG. 5, the needle comprises a needle body 1 and a conical portion, and the conical portion is disposed on the end of the needle body 1 and coordinated with the cold water inlet, and the needle body 1 is circumferentially provided with a supporting member so as to allow outer surface of the supporting member to coordinate with the inner cavity of the nozzle, in order to limit the position of the needle body 1 and to form a fluid passage 3 on the supporting member, as the needle is disposed inside the nozzle 9.

(33) During the practical application of the needle illustrated above, even if the pressure of the fluid passing through the nozzle 9 is great with instable flow velocity, which means in the axial direction of the needle, even if the different portions of the needle may bear quite different radial pressures with others, the needle is adapted for preventing itself from deviating from the spout of the nozzle 9 or radially dithering or swinging due to the great and non-uniform radial pressure under the needle in its radial direction, without affecting the smooth flow of the fluid, thus adapted for preventing from affecting the effects of jet from the nozzle 9 to the spout 10.

(34) According to the function of the supporting member illustrated before, this supporting member can also be designed in various ways according to actual application. Some structures of the supporting members may be illustrated in details with the accompanying drawings. However, it should be noted the supporting member might not be limited to the following exemplary structures, and any variations, alternatives or amendments would be understood by the skilled in the art.

(35) FIG. 1 illustrates a first structure of the supporting member, comprising a plurality of ribs 4 circumferentially and uniformly arranged around the needle body 1 and extending in the axial direction of the needle, and forming the fluid passage 3 between the ribs 4, so that after assembly of the nozzle and the needle, the ribs 4 may be attached to the inner cavity of the nozzle, adapted for limiting the position of the needle body 1.

(36) For processing the ribs, the mechanical methods may be used such as cutting, or some methods may be used to form the ribs 4 on the needle body 1 in one-step such as casting and injecting, according to practical requirements.

(37) Additionally, for enhancing the jet effects of the nozzle, the ribs 4 comprise a first rib part 41 and a second rib part 42, and the first rib part 41 is arranged towards the cold water inlet 91 and has a radial dimension smaller than that of the second rib part 42, so as to coordinate with the inner wall of the nozzle to form the fluid passage 3, and the outer surface of the second rib part 41 is fitted with the inner cavity of the nozzle. By improving the structure of the ribs 4, it improves the jet effect of the nozzle 9 as well as the limitation of the position of the needle by the supporting member.

(38) When the position of the needle is limited by the supporting member, the needle may displace back and forth in the axial direction of the nozzle, as well as rotate in the nozzle.

(39) Of course, during the practical application, a groove may be formed in the inner wall of the nozzle 9, and the groove corresponds to the second rib part 42 and extends in the axial direction of the nozzle 9. The second rib part 42 may be engaged within the groove and slide along the axial direction of the nozzle. In such structure, the groove is adapted for guiding the movement of the needle as well as preventing the needle from rotating, which means the needle can only displace back and forth in the axial direction of the nozzle without rotation.

(40) For facilitating process, it is preferable that the number of the ribs may be three, four, five or six, preferably four. However, there is no limitation for the number of the ribs in the present invention as long as the technical effects of this invention will be achieved. The sum of the cross section of all fluid passages 3 formed between the ribs 4 is larger than the cross section of the cold water outlet 92 of the nozzle 9. It is ensured that the pressure of the cold water outlet 92 is great enough for good jet effects of the cold water jetting outlet 16.

(41) FIG. 4 illustrates a second structure of the supporting member, which is an annular supporting plate 5 disposed on the needle body 1, and a plurality of diversion openings 6 are formed on the annular supporting plate 5, being used as the fluid passage.

(42) The annular supporting plate 5 may have a certain thickness according to actual requirements. Additionally, the shape of the diversion opening 6 may not be limited to a circular hole shown in FIG. 4 but a fan shaped hole. Meanwhile, the diversion opening 6 should be designed for little impact or no impact on the flow velocity of the fluid passing by. For example, the connection portion between the diversion opening 6 and the annular supporting plate 5 is preferred to be a circular arc in favor of flowing of the fluid.

(43) FIG. 3 illustrates a third structure of the supporting member, which is a circular ring 7 in connection with the needle body 1 through a plurality of ribs 8, and fluid passage 3 is formed therebetween.

(44) The shapes of circular ring 7 and the ribs 8 are designed for smooth flowing of the fluid, for little impact or no impact.

(45) It should be noted that the structure of the supporting member should not be restricted to the above described examples.

(46) Furthermore, refer to FIG. 1 and FIG. 2, a water pressurizing and mixing segment 1a is disposed between the supporting member of the needle body 1 and the conical portion 2, the shape of which is a cylinder, so that after assembling the needle and the nozzle, a cold water inflow space 15 may be formed between the water pressurizing and mixing segment 1a of the needle and the wall of the inner cavity of the nozzle, shown in FIG. 2. It ensures that before the fluid flowing through the fluid passage flows into the jetting cone formed between the conical portion 2 and the spout 10, it may be fully mixed and pressurized, so as to ensure a good jet effect of the spout 10 of the nozzle 9. In the present embodiment, the length of the water pressurizing and mixing segment 1a is 7 mm.

(47) Refer to FIG. 2, when the needle is moving towards the spout 10 in the axial direction of the nozzle 9, the conical portion 2 of the needle is gradually fitted with the spout 10. Thus, for preventing cold water from jetting out of the spout 10 when the conical portion 2 is fully fitted with the spout 10, preferable, the diameter of the water pressurizing and mixing segment 1a may be larger than, equal to or slightly smaller than the diameter of the spout 10 of the nozzle. Here, the meanings of larger and slightly smaller than are: if the diameter of the root of the conical portion is greater than that of the cold water outlet 92 of the nozzle 9, the nozzle 9 is displaced in the axial direction. When the hot water port 12a is maximized opened, and the cold water jetting outlet 16 is closed, the edge of the cold water outlet 92 of the nozzle 9 contacts with the edge of the conical portion of the needle, so as to close the cold water jetting outlet 16; if the diameter of the root of the conical portion of the needle is a little bit less than the diameter of the cold water outlet 92 of the nozzle 9, the nozzle 9 is displaced in the axial direction. When the hot water port 12a is maximized opened, the conical portion of the needle passes through the cold water outlet 92 of the nozzle 9 so as to close most part of the cold water jetting outlet 16. An extremely small gap may be maintained between the conical portion of the needle and the cold water outlet 92 for cold water to flow by. At this moment, the hot water port 12a is entirely opened and the cold water flowing through the gap may be ignored.

(48) It should be noted that the length of the water pressurizing and mixing segment 1a provided in the present embodiment might not be too short, otherwise there might be possibilities of bifurcation of the water discharged from the nozzle. Specifically, the length of the water pressurizing and mixing segment 1a is relevant to the cross section of the flow path, the cross section of the spout of the nozzle and the thickness of the supporting member. However the impact will not be significant.

(49) In addition, refer to FIG. 5, the diameter of the conical portion 2 is decreasing from its root 2a to its front end 2b, with a conicity between 20? and 90?, including 20? and 90?, preferred 30?. After assembling the needle and the nozzle 9, the length of the conical portion 2 may be smaller than or equal to the movable stroke of the nozzle 9, so as to fit the cold water outlet 92 with the conical portion 2 appropriately.

(50) Accordingly, the conicity of the cold water outlet 16 is larger than or equal to that of the conical portion 2 of the needle. Hence, in the present embodiment, the conical portion of the nozzle has a conicity between 30? and 100?, preferred 60? in this embodiment.

(51) Furthermore, the diameter of the conical portion 2 is continuously decreasing from its root 2a to its front end 2b, i.e. the conical portion 2 is a cone. For smooth flow of the fluid, refer to FIG. 2, the conical portion 2 may be combined with the cold water outlet 92 of the nozzle 9 in a linear manner. Alternatively, the surface of the conical portion 2 also may be structured in a non-linear in accordance with the fluid mechanics or be structured in a parabolic manner, so that proper adjustments may be made automatically according to different flowing velocities.

(52) It is noted that the parameters for every element of the jet mixer provided in the present invention have a significant impact upon the effects of the absorption of hot water of the jet mixer. It is proved via experiments that the vacuum adsorption is quite good even when the inflow of the cold water is on a lower level due to the jet mixer with the specific parameters. The testing result is listed in the following table 1.

(53) TABLE-US-00001 adjusting for lowest inflow Test condition of cold water pressure of the cold negative pressure for absorbing hot water port (Mpa) water (meter water column) 0.05 ?0.29 0.1 ?0.48 0.15 ?0.8 0.2 ?1

(54) Obviously, the above embodiments are merely used for clearly describing the examples rather than limiting the scope of the invention. Those ordinary skilled in the art can also make changes or variations in other different forms on the basis of the above description. It is unnecessary to describe all the implementation ways herein. However, the obvious changes or variations derived from the invention still fall in the scope of protection of the present invention.