Valve

Abstract

A valve comprises a screw rod and a valve needle assembly, the screw rod comprises a first plane portion, the first plane portion is perpendicular to the axis of the screw rod, the valve needle assembly comprises a spherical surface portion, and the first plane portion is in contact with the spherical surface portion. The valve comprises a lead screw and a valve needle assembly, the lead screw comprises a first plane part, the first plane part is perpendicular to the axis of the lead screw, the valve needle assembly comprises a spherical part, the first plane part makes contact with the spherical part, the force of the spherical part on the plane part is perpendicular to the plane part, in the flow adjusting process of the valve, the acting force of the spherical part on the lead screw is reduced in the radial direction of the lead screw, and the flow adjusting efficiency is improved. And the lead screw deviation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and particularly to a valve. Background Art

[0002] Reference Figures 1-2 , an electronic expansion valve, in which a lead screw 23`, a valve needle component and a guide sleeve 26` are arranged in a valve cavity. The lead screw 23` is in threaded cooperation with the guide sleeve 26`. The valve needle component includes a force transmission component bushing 241`, a valve stem 242`, a valve needle 243` and a corrugated pipe 244`. A steel ball 231` is fixed at the bottom of the lead screw 23`. Both the bushing 241` and the steel ball 231` are force transmission components. The bottom of the lead screw 23` has an axial groove 232` opening downward, and the steel ball 231` is welded in the axial groove 232`. When the lead screw 23` moves axially, the movement is transmitted to the bushing 241` through the steel ball 231`, and then to the valve stem 242` and the valve needle 243`. The valve needle 243` moves up and down to control the opening degree of the valve port 25`.

[0003] When adjusting the flow rate, due to the impact force of the fluid on the valve needle 243`, the valve stem 242` deflects. In the radial direction of the lead screw 23`, the force of the valve stem 242` on the steel ball 231` increases. Since the steel ball 231` is welded to the lead screw 23`, the lead screw 23` deflects, resulting in the lead screw 23` being stuck. Summary of the Invention

[0004] The following technical solution is provided: a valve, the valve includes a lead screw and a valve needle assembly. The lead screw includes a first planar portion perpendicular to the axis of the lead screw. The valve needle assembly includes a spherical surface portion, and the first planar portion contacts the spherical surface portion.

[0005] For such a valve, the valve includes a lead screw and a valve needle assembly. The lead screw includes a first planar portion perpendicular to the axis of the lead screw. The valve needle assembly includes a spherical surface portion, and the first planar portion contacts the spherical surface portion. The force of the spherical surface portion on the planar portion is perpendicular to the planar portion. During the process of the valve adjusting the flow rate, in the radial direction of the lead screw, the force of the spherical surface portion on the lead screw is reduced, and the deflection of the lead screw is reduced. Brief Description of the Drawings

[0006] Figure 1 is a schematic structural diagram of the background art in the present invention;

[0007] Figure 2 is another schematic structural diagram of the background art in the present invention;

[0008] Figure 3 is a schematic structural diagram of an embodiment of the valve in the present invention;

[0009] Figure 4 is Figure 3Partial enlarged view of part A;

[0010] Figure 5 It is a schematic structural diagram of another embodiment of the valve in the present invention.

[0011] Reference numerals:

[0012] Lead screw 1, first planar portion 11,

[0013] Spherical surface portion 21, first mounting hole 221, fourth main body portion 222, valve needle portion 223, second convex portion 224, bushing 231, third main body portion 2311, first mounting portion 2312, first groove 2313, sphere 24, first portion 25,

[0014] Valve seat 31, first main body portion 311, first wall portion 3111, first extension portion 312, first limiting wall portion 313, valve port portion 314, first limiting member 32, second main body portion 321, first convex portion 322,

[0015] Bellows 4, first bending portion 41, second bending portion 42,

[0016] First screw sleeve 5, first guide sleeve 6, reduction gear set 7, power output mechanism 8. Specific embodiments

[0017] The technical solutions of the specific embodiments will be described below with reference to the accompanying drawings.

[0018] It should be noted that: Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify, combine or equivalently replace the present invention, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

[0019] Refer to Figures 3-4 , a valve, the valve includes a valve seat 31, a first screw sleeve 5, a first guide sleeve 6, a reduction gear set 7 and a power output mechanism 8. The first screw sleeve 5 is sleeved on the first guide sleeve 6. In the axial direction of the lead screw 1, the first screw sleeve 5 is limited to the first guide sleeve 6, and the first screw sleeve 5 is threadedly connected to the valve seat 31 to limit the first guide sleeve 6 to the valve seat 31.

[0020] Refer to Figures 3-4 , the first guide sleeve 6 has an internal thread, the valve includes a lead screw 1, the lead screw 1 has an external thread adapted to the internal thread, the power output mechanism 8 is drivingly connected to the reduction gear set 7, and the reduction gear set 7 is drivingly connected to the lead screw 1, so that the lead screw 1 rotates. Since the lead screw 1 is in threaded engagement with the first guide sleeve 6, the lead screw 1 moves up and down.

[0021] Refer toFigures 3-4 , the valve includes a valve needle assembly, the lead screw 1 includes a first planar portion 11, the first planar portion 11 is perpendicular to the axis of the lead screw 1, the valve needle assembly includes a spherical surface portion 21, and the first planar portion 11 contacts the spherical surface portion 21.

[0022] For such a valve, the valve includes a lead screw 1 and a valve needle assembly. The lead screw 1 includes a first planar portion 11, the first planar portion 11 is perpendicular to the axis of the lead screw 1, the valve needle assembly includes a spherical surface portion 21, the first planar portion 11 contacts the spherical surface portion 21, and the force of the spherical surface portion 21 on the planar portion is perpendicular to the planar portion. During the process of the valve adjusting the flow rate, in the radial direction of the lead screw 1, the acting force of the spherical surface portion 21 on the lead screw 1 is reduced, and the offset of the lead screw 1 is reduced.

[0023] The spherical surface portion 21 can roll and / or slide on the first planar portion 11, which will not be elaborated here.

[0024] Reference Figure 4 , the bottom wall of the lead screw 1 is the first planar portion 11, or a part of the bottom wall of the lead screw 1 is the first planar portion 11. During the process of the valve opening / closing and / or flow rate adjustment, the spherical surface portion 21 can roll and / or slide on the first planar portion 11, which will not be elaborated here.

[0025] Reference Figures 3-4 , the valve needle assembly includes a valve stem and a first component. The first component includes a spherical surface portion 21. The first component is fixed to the valve stem. The valve includes a valve seat assembly. The valve seat assembly has a first limiting hole. The valve stem passes through the first limiting hole. The valve stem can slide along the wall portion corresponding to the first limiting hole, or the valve stem has a clearance fit with the first limiting hole, and the valve stem is limited in the radial direction (the radial direction of the following fourth main body portion 222).

[0026] Reference Figure 4 , the valve seat assembly includes a valve seat 31 and a first limiting member 32. The valve seat 31 includes a first main body portion 311 and a first extending portion 312. The first main body portion 311 includes a first wall portion 3111. The first extending portion 312 protrudes from the first wall portion 3111. The first limiting member 32 includes a second main body portion 321. The second main body portion 321 is cylindrical. The first extending portion 312 is sleeved on the second main body portion 321. The first extending portion 312 is welded to the second main body portion 321. The second main body portion 321 contacts or is fixed to the first wall portion 3111. The first limiting hole penetrates the second main body portion 321 in the thickness direction of the second main body portion 321, which is convenient for assembly.

[0027] Reference Figure 4, the first component includes a bushing 231. The bushing 231 includes a third main body portion 2311. The valve stem has a first mounting hole 221, and the first mounting hole 221 is recessed in the top wall of the valve stem. The third main body portion 2311 is at least partially located in the first mounting hole 221. The bushing 231 is fixed or limited with respect to the valve stem. For example, the valve stem is welded to the bushing 231, threadedly connected to the first mounting hole 221, or interference-fitted, etc., which will not be elaborated here.

[0028] Reference Figure 4 , the bushing 231 includes a first mounting portion 2312. The third main body portion 2311 protrudes from the first mounting portion 2312. The bushing 231 includes a first groove 2313. The first groove 2313 is recessed in the wall portion of the first mounting portion 2312 facing away from the third main body portion 2311. The center line of the first groove 2313 coincides with the axis of the first mounting hole 221, improving the coaxiality of the sphere 24 and the valve stem. The first component includes a sphere 24. The sphere 24 is welded to the notch of the first groove 2313, and the spherical surface portion 21 is part of the sphere 24.

[0029] Reference Figure 4 , the first limiting member 32 includes a first convex portion 322. The first convex portion 322 is in the shape of a hollow cylinder. The first convex portion 322 protrudes from the second main body portion 321 away from the lead screw 1. The valve stem includes a fourth main body portion 222 and a second convex portion 224. The second convex portion 224 protrudes from the side wall of the fourth main body portion 222. The first convex portion 322 surrounds the fourth main body portion 222, and the inner diameter of the first convex portion 322 is greater than the outer diameter of the fourth main body portion 222.

[0030] Reference Figures 3-4 , the valve includes a bellows 4. One end of the bellows 4 is sleeved on the first convex portion 322, and one end of the bellows 4 is fixed to the first convex portion 322. The other end of the bellows 4 is fixed or limited with respect to the second convex portion 224.

[0031] Reference Figure 3 , the bellows 4 includes a first bent portion 41 and a second bent portion 42. The first bent portion 41 and the second bent portion 42 are substantially perpendicular. The first bent portion 41 is sleeved on the second convex portion 224, and the second bent portion 42 is in contact with or fixedly connected to the side wall of the second convex portion 224 facing away from the second main body portion 321.

[0032] Reference Figure 3 , the valve seat 31 includes a first limiting wall portion 313. The first limiting wall portion 313 is located on the side of the first limiting member 32 away from the lead screw 1. The first limiting wall portion 313 is sleeved on the valve stem.

[0033] Reference Figure 3, the valve seat 31 includes a valve port portion 314, the fourth main body portion 222 includes a valve needle portion 223 adapted to the valve port portion 314, the valve needle portion 223 is located on the side of the second convex portion 224 away from the second main body portion 321, and the first limiting wall portion 313 is sleeved on the valve needle portion 223 to limit the valve stem in the radial direction of the fourth main body portion 222.

[0034] Of course, the valve needle portion 223 can be separately provided and fixed to the valve stem, which will not be elaborated here.

[0035] Reference Figure 5 , the bushing 231 includes a first portion 25, the first portion 25 is hemispherical, the third main body portion 2311 protrudes from the first portion 25, and the spherical surface portion 21 is part of the first portion 25.

[0036] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A valve, characterized in that, The valve comprises a screw rod (1) and a valve needle assembly, wherein the screw rod (1) comprises a first plane portion (11), wherein the first plane portion (11) is perpendicular to the axis of the screw rod (1), and the valve needle assembly comprises a spherical portion (21), wherein the first plane portion (11) is in contact with the spherical portion (21).

2. The valve according to claim 1, characterized in that, The valve needle assembly includes a valve stem and a first component, the first component includes a spherical portion (21), the first component is fixed to the valve stem, the valve includes a valve seat assembly, the valve seat assembly has a first limiting hole, the valve stem passes through the first limiting hole, and the valve stem can slide along the wall corresponding to the first limiting hole.

3. The valve according to claim 2, characterized in that, The valve seat assembly comprises a valve seat (31) and a first limiting member (32); the valve seat (31) comprises a first main body portion (311) and a first extension portion (312); the first main body portion (311) comprises a first wall portion (3111); the first extension portion (312) protrudes from the first wall portion (3111); the first limiting member (32) comprises a second main body portion (321); the first extension portion (312) is sleeved on the second main body portion (321); the first extension portion (312) is welded to the second main body portion (321); the second main body portion (321) is in contact with or fixed to the first wall portion (3111); and the first limiting hole penetrates the second main body portion (321) in the thickness direction of the second main body portion (321).

4. The valve according to claim 3, characterized in that, The valve seat (31) comprises a first limiting wall portion (313), the first limiting wall portion (313) being located on a side of the first limiting member (32) away from the screw rod (1), and the first limiting wall portion (313) being sleeved on the valve stem.

5. The valve according to claim 4, characterized in that, The first component includes a bushing (231), the bushing (231) includes a third main body (2311), the valve stem has a first mounting hole (221), the first mounting hole (221) is recessed in the top wall of the valve stem, the third main body (2311) is at least partially located in the first mounting hole (221), and the bushing (231) is fixed or limited to the valve stem.

6. The valve according to claim 5, characterized in that, The bushing (231) includes a first mounting portion (2312), the third main body portion (2311) protrudes from the first mounting portion (2312), the bushing (231) includes a first groove (2313), the first groove (2313) is recessed in the wall portion of the first mounting portion (2312) away from the third main body portion (2311), the first component includes a sphere (24), the sphere (24) is welded to the notch of the first groove (2313), and the spherical portion (21) is a portion of the sphere (24).

7. The valve according to claim 5, characterized in that, The bushing (231) comprises a first portion (25), the first portion (25) is hemispherical, the third main body portion (2311) protrudes from the first portion (25), and the spherical portion (21) is part of the first portion (25).

8. The valve according to any one of claims 3 - 7, characterized in that The first limiting member (32) includes a first convex portion (322), the first convex portion (322) protrudes from the second main body portion (321) away from the lead screw (1), the valve stem includes a fourth main body portion (222) and a second convex portion (224), the second convex portion (224) protrudes from the side wall of the fourth main body portion (222), the first convex portion (322) surrounds the fourth main body portion (222), the valve includes a bellows (4), one end of the bellows (4) is sleeved on the first convex portion (322), one end of the bellows (4) is fixed to the first convex portion (322), and the other end of the bellows (4) is fixed or limited to the second convex portion (224).

9. The valve according to claim 8, characterized in that, The valve seat (31) includes a valve port portion (314), the fourth main body portion (222) includes a valve needle portion (223) adapted to the valve port portion (314), the valve needle portion (223) is located on a side of the second convex portion (224) away from the second main body portion (321), and the first limiting wall portion (313) is sleeved on the valve needle portion (223).

10. The valve according to claim 9, characterized in that, The valve includes a first screw sleeve (5), a first guide sleeve (6), a reduction gear set (7) and a power output mechanism (8), the first screw sleeve (5) is sleeved on the first guide sleeve (6), in the axial direction of the lead screw (1), the first screw sleeve (5) is limited to the first guide sleeve (6), the first screw sleeve (5) is threadedly connected to the valve seat (31), the first guide sleeve (6) has an internal thread, the lead screw (1) has an external thread adapted to the internal thread, the power output mechanism (8) is drivingly connected to the reduction gear set (7), and the reduction gear set (7) is drivingly connected to the lead screw (1).

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