Spindle member and flow control valve

Abstract

The present application provides a spindle member and a flow control valve, comprising a first rod segment, a second rod segment, and a third rod segment connected in sequence, the first rod segment having an outer diameter larger than that of the second rod segment, and the second rod segment having an outer diameter larger than that of the third rod segment, a bearing fitted to the second rod segment, and a bush fitted to the third rod segment, the bush being welded to the third rod segment, and two end faces of an inner ring of the bearing being abutted against the end faces of the first rod segment and the bush, respectively. According to the technical aspects provided by the present application, the problem in the prior art that the inner ring of the bearing is subjected to a relatively large force when the bearing is attached to the spindle member, the retainer inside the bearing is deformed and the bearing is stopped when it rotates is avoided, and the friction force when the bearing rotates is reduced, improving the performance of the product.

Description

[Technical Field]

[0001] The present application relates to the technical field of flow control valves, and more particularly to a spindle member and a flow control valve. [Background technology]

[0002] Currently, in the prior art, spindle members and flow control valves, such as electronic expansion valves, usually adopt a method in which a bearing is mounted on a screw, and then a flange hole is provided in the screw, and axial restriction is provided for the bearing by flanging.

[0003] The flange structure of the screw restricts the bearing, but the force received by the flange hole during the flanging process increases, which tends to increase the force received by the inner ring of the bearing. This causes the retainer inside the bearing to deform, preventing the bearing from rotating. This increases the frictional force when the bearing rotates, affecting the valve opening performance and product life. Summary of the Invention

[0004] The present application provides a spindle member and a flow control valve to solve the problem that the inner ring of the bearing in the spindle member in the prior art is subjected to a relatively large force.

[0005] In order to solve the above problems, according to one aspect of the present application, there is provided a spindle member including a first rod segment, a second rod segment, and a third rod segment connected in order, wherein the outer diameter of the first rod segment is larger than the outer diameter of the second rod segment and the outer diameter of the second rod segment is larger than the outer diameter of the third rod segment; a bearing fitted to the second rod segment; and a bushing fitted to the third rod segment, wherein the bushing is welded to the third rod segment and the two end faces of the inner ring of the bearing abut against the end faces of the first rod segment and the end faces of the bushing, respectively.

[0006] Furthermore, in the axial direction of the screw, the length of the second rod segment is defined as M, the length of the inner ring is defined as N, and M <Nである。

[0007] Furthermore, M≧N / 2.

[0008] Additionally, the inner diameter of the bushing is greater than the outer diameter of the third rod segment, or the inner diameter of the bushing is equal to the outer diameter of the third rod segment, or the inner diameter of the bushing is less than the outer diameter of the third rod segment.

[0009] Furthermore, the outer diameter of the bushing and the outer diameter of the first rod segment are both smaller than the inner diameter of the outer ring of the bearing.

[0010] Additionally, the spindle member further includes a valve head having an assembly chamber, the bearing being located within the assembly chamber.

[0011] Furthermore, the spindle member further includes a limiting seat provided in the assembly chamber, wherein the bushing and the third rod segment are both located within the chamber of the limiting seat, the limiting seat abutting against the outer ring of the bearing, and an elastic member provided in the assembly chamber, one end abutting against the limiting seat and the other end abutting against the bottom wall of the assembly chamber.

[0012] Furthermore, the limiting seat includes a limiting sleeve and a limiting protrusion provided at one end of the limiting sleeve, the bearing and the third rod segment are both located within the limiting sleeve, the limiting sleeve abuts against the outer ring, the elastic member is a spring, and the limiting protrusion penetrates into the elastic member.

[0013] According to another aspect of the present application, there is provided a flow control valve including the spindle member described above.

[0014] Furthermore, the screw of the spindle member further includes a fourth rod segment, the fourth rod segment is connected to the first rod segment, the fourth rod segment has an external thread, the flow control valve further includes a nut structure, the nut structure has an internal thread, and the internal thread and the external thread are engaged with each other.

[0015] Furthermore, the flow control valve is an electronic expansion valve.

[0016] Applying this technical aspect of the present application provides a spindle member including a screw including a first rod segment, a second rod segment, and a third rod segment connected in order, where the outer diameter of the first rod segment is larger than that of the second rod segment and the outer diameter of the second rod segment is larger than that of the third rod segment, a bearing fitted to the second rod segment, and a bushing fitted to the third rod segment, where the bushing is welded to the third rod segment and two end faces of an inner ring of the bearing abut against the end face of the first rod segment and the end face of the bushing, respectively. When this aspect is adopted, the outer diameters of the rod segments in the screw are, in descending order, the first rod segment, the second rod segment, and the third rod segment. Here, the second rod segment is a mounting segment for the bearing, and is clearance-fit, transition-fit, or interference-fit with the inner ring of the bearing, with the inner ring abutting against the step formed between the first rod segment and the second rod segment; the third rod segment is a mounting segment for the bushing, and is clearance-fit, transition-fit, or interference-fit with the inner hole of the bushing, with one end of the bushing abutting against the inner ring of the bearing, and the bushing is fixed to the screw by welding to form an integral unit, restricting the axial direction of the inner ring of the bearing; this structure avoids the problem in conventional flow control valves that, when a bearing is mounted on a spindle member, the inner ring of the bearing is subjected to a relatively large force, causing the retainer inside the bearing to deform and stop the bearing from rotating; it reduces the frictional force when the bearing rotates, and improves product performance. [Brief explanation of the drawings]

[0017] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0018] [Figure 1] 1 shows a structural schematic diagram of a spindle member provided in an example of the present application. [Figure 2] 2 is a schematic diagram of a part of the structure of the spindle member in FIG. 1. [Figure 3] 2 shows a schematic diagram of the pressing sleeve in FIG. 1.

[0019] Here, the above drawings include the following reference numerals: 10 screw, 11 first rod segment, 12 second rod segment, 13 third rod segment, 14 fourth rod segment, 20 bearing, 30 bushing, 40 valve head, 41 assembly chamber, 411 first chamber segment, 412 second chamber segment, 413 step surface, 414 third chamber segment, 415 transition segment, 42 sealing end, 50 limiting seat, 51 limiting sleeve, 52 limiting protrusion, 60 elastic member, 70 pressing sleeve, 71 accommodating passage. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The description of at least one exemplary embodiment below is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] 1 and 3, an embodiment of the present application provides a spindle member including a screw 10 including a first rod segment 11, a second rod segment 12, and a third rod segment 13 connected in order, the first rod segment 11 having an outer diameter larger than that of the second rod segment 12, the second rod segment 12 having an outer diameter larger than that of the third rod segment 13, a bearing 20 fitted to the second rod segment 12, and a bushing 30 fitted to the third rod segment 13, the bushing 30 being welded to the third rod segment 13, and two end faces of an inner ring of the bearing 20 abutting against the end face of the first rod segment 11 and the end face of the bushing 30, respectively. Specifically, the bearing 20 includes an inner ring, an outer ring, steel balls disposed between the inner ring and the outer ring, and a retainer.

[0022] In this embodiment, the bearing 20 and bushing 30 are provided on rod segments of the screw 10, and the outer diameters of the rod segments of the screw 10 are, in descending order, the first rod segment 11, the second rod segment 12, and the third rod segment 13. The second rod segment 12 is the mounting segment for the bearing 20, and is clearance-fitted, transition-fitted, or interference-fitted with the inner ring of the bearing 20. The bearing 20 is fitted onto the second rod segment 12, and one end of the inner ring of the bearing 20 abuts against a step surface formed by the first rod segment 11 and the second rod segment 12. The third rod segment 13 is the mounting segment for the bushing 30, and is clearance-fitted, transition-fitted, or interference-fitted with the inner hole of the bushing 30. The bushing 30 is fitted onto the third rod segment 13, and one end face of the bushing 30 abuts against the other end of the inner ring of the bearing 20. Furthermore, the bushing 30 and the third rod segment 13 are welded together to restrict the bearing 20. This structure avoids the problem of the conventional technology using flanging, in which the inner ring of the bearing 20 is subjected to a relatively large force, causing the retainer inside the bearing 20 to deform and stop the bearing 20 from rotating, thereby reducing the frictional force when the bearing 20 rotates and improving the performance of the product.

[0023] As shown in Fig. 2, in the axial direction of the screw 10, the length of the second rod segment 12 is M, the length of the inner ring is N, and M < N. Since the length of the inner ring of the bearing 20 is greater than that of the second rod segment 12, one end of the inner ring of the bearing 20 abuts against the stepped surface formed by the first rod segment 11 and the second rod segment 12, and the other end is ensured to protrude slightly from the second rod segment 12 and abut against the bush 30. In this way, the inner ring of the bearing 20 is restricted in both directions, improving the assembly accuracy and avoiding the reduction of the flow rate consistency of the flow control valve due to the axial sway of the bearing 20.

[0024] Specifically, M ≧ N / 2. That is, the length of the second rod segment 12 should not be too short, ensuring that the bearing 20 can be stably fitted onto the second rod segment 12 and avoiding unnecessary damage to the second rod segment 12, the bearing 20, and the third rod segment 13 when the spindle member operates.

[0025] In this embodiment, the length of the second rod segment 12 is less than the length of the inner ring of the bearing 20 and is greater than or equal to half of the length of the inner ring of the bearing, that is, N > M ≧ N / 2. This ensures that the bush 30 and the bearing 20 are properly abutted, restricts the bearing 20 by the stepped surface and the bush 30 against which the two ends of the bearing 20 are respectively abutted, prevents the bearing 20 from moving axially on the screw 10, and improves the valve opening performance, product life, and flow rate consistency of the product.

[0026] Optionally, the inner diameter of the bush 30 is greater than the outer diameter of the third rod segment 13, or the inner diameter of the bush 30 is equal to the outer diameter of the third rod segment 13, or the inner diameter of the bush 30 is less than the outer diameter of the third rod segment 13. According to the actual situation, the relationship between the inner diameter of the bush 30 and the outer diameter of the third rod segment 13 can be adjusted, facilitating adjustment and assembly.

[0027] [[ID=十六]] Furthermore, the outer diameter of the bushing 30 and the outer diameter of the first rod segment 11 are both smaller than the inner diameter of the outer ring of the bearing 20. And, the outer diameter of the bushing 30 and the outer diameter of the first rod segment 11 are both larger than half the outer diameter of the inner ring of the bearing 20. In this way, interference between the bushing 30, the first rod segment 11, and the outer ring can be avoided.

[0028] 1, the spindle member further includes a valve head 40 having an assembly chamber 41, and the bearing 20 is located in the assembly chamber 41. The valve head 40 is provided with the assembly chamber 41, and the movement of the valve head 40 is controlled by other spindle members assembled in the assembly chamber 41, which has a simple structure and occupies a small space.

[0029] Specifically, the spindle member is a limiting seat 50 provided in the assembly chamber 41, and the bushing 30 and the third rod segment 13 are both located within the chamber of the limiting seat 50, and the limiting seat 50 further includes a limiting seat 50 abutting against the outer ring of the bearing 20, and an elastic member 60 provided in the assembly chamber 41, one end abutting against the limiting seat 50 and the other end abutting against the bottom wall of the assembly chamber 41. The limiting seat 50 can restrict the outer ring of the bearing 20 in the axial direction.

[0030] In this embodiment, the bushing 30 and the third rod segment 13 are located in the chamber of the limiting seat 50, the limiting seat 50 is provided in the assembly chamber 41, and the elastic member 60 is also provided in the assembly chamber 41. From the above, it can be seen that in Fig. 1, the components in the assembly chamber 41 are, from bottom to top, the elastic member 60, the limiting seat 50, the third rod segment 13, the bushing 30 fitted onto the third rod segment 13, the bearing 20 abutting against the bushing 30, and the second rod segment 12 fitted with the bearing 20. By providing other structures of the spindle member in the assembly chamber 41 of the valve head 40, it is possible to reduce the overall space usage and, at the same time, the assembly chamber 41 can provide some axial restriction and guiding functions for other components.

[0031] Furthermore, the limiting seat 50 includes a limiting sleeve 51 and a limiting protrusion 52 provided at one end of the limiting sleeve 51, the bearing 20 and the third rod segment 13 are both located within the limiting sleeve 51, the limiting sleeve 51 abuts against the outer ring, the elastic member 60 is a spring, and the limiting protrusion 52 penetrates into the elastic member 60.

[0032] Here, the limiting sleeve 51 has a cylindrical structure, one end of which abuts against the outer ring of the bearing 20, and the other end of which is connected to a protruding limiting protrusion 52. The limiting protrusion 52 has a cylindrical structure, one end of which is connected to the limiting sleeve 51, and the other end of which penetrates into the elastic member 60. Alternatively, the abutment of one end of the elastic member 60 against the limiting seat 50 may be understood as the abutment of one end of the elastic member 60 against the limiting sleeve 51. In this embodiment, the limiting protrusion 52 provided within the elastic member 60 provides a certain degree of limiting and guiding function, ensuring stable movement of the limiting seat 50 abutted against the elastic member 60 and ensuring stable movement of the bearing 20 abutted against the limiting seat 50. In addition, by arranging both the bearing 20 and the third rod segment 13 within the limiting sleeve 51, structural interference can be avoided and the compactness of the spindle assembly can be improved.

[0033] In this embodiment, the screw 10, bearing 20 and bushing 30 constitute a screw assembly, the valve head 40 has a sealing end 42 for closing the valve port, and the spindle member further includes a pressing sleeve 70 provided at one end of the valve head 40 remote from the sealing end 42, and one end of the pressing sleeve 70 adjacent to the sealing end 42 abuts against the screw assembly, thereby restricting the screw assembly by the pressing sleeve 70.

[0034] With the above-described arrangement, at least a portion of the screw 10 is disposed within the assembly chamber 41, and the screw 10 is disposed movably relative to the valve head 40. The pressure sleeve 70 is disposed at one end of the valve head 40 remote from the sealing end 42, and the bearing 20 is fixed to the end of the valve head 40 remote from the sealing end 42. In this way, the bearing 20 and the pressure sleeve 70 are limitedly engaged to move the valve head 40 in unison. Since the sealing end 42 does not have a pressure-mounting structure, the impact on the sealing position of the bottom of the valve head (i.e., the sealing end 42) during assembly of the pressure sleeve 70 is greatly reduced, improving the sealing effect and flow consistency and solving the problem of the risk of leakage when the valve head is closed in the prior art.

[0035] To make the installation of the sleeve 70 easier, in this embodiment the pressing sleeve 70 has an annular structure, and the pressing sleeve 70 and the valve head 40 are interference-fitted or welded together.

[0036] To achieve the installation of the pressing sleeve 70, in the spindle member of this embodiment, the assembly chamber 41 includes a first chamber segment 411 and a second chamber segment 412, and along the extension direction of the valve head 40, the cross-sectional area of ​​the second chamber segment 412 is larger than the cross-sectional area of ​​the first chamber segment 411, thereby forming a step surface 413 between the first chamber segment 411 and the second chamber segment 412, and the pressing sleeve 70 abuts against the step surface 413.

[0037] In this embodiment, the pressure sleeve 70 has an accommodating passage 71, and the cross-sectional area of ​​the accommodating passage 71 is smaller than the cross-sectional area of ​​the first chamber segment 411 along the extension direction of the valve head 40, thereby forming a limiting surface between the pressure sleeve 70 and the first chamber segment 411 for contacting the screw assembly. In this way, the screw assembly can be stably restricted. Specifically, the limiting surface of the pressure sleeve 70 can be configured to contact the outer ring of the bearing 20 on one side away from the bushing 30, or a stepped surface can be provided on the screw 10 so that the limiting surface of the pressure sleeve 70 and the stepped surface of the screw 10 can contact each other. Both of these two methods can achieve axial restriction of the screw assembly.

[0038] Here, the assembly chamber 41 includes a third chamber segment 414, and the elastic member 60 is inserted into the third chamber segment 414. In this way, the attachment of the elastic member 60 becomes more secure.

[0039] The valve head 40 has a sealing end 42 for closing the valve port, and the assembly chamber 41 further includes a transition segment 415, which is located on one side of the third chamber segment 414 away from the sealing end 42, and the cross-sectional area of ​​the transition segment 415 gradually decreases along a direction approaching the sealing end 42 of the valve head 40. This structure provides a buffering effect against collisions that may occur between the screw 10 and the valve head 40 during operation.

[0040] According to another embodiment of the present application, there is provided a flow control valve including the spindle member described above.

[0041] As shown in FIG. 2, the screw 10 of the spindle member further includes a fourth rod segment 14, which is connected to the first rod segment 11. The fourth rod segment 14 has an external thread, and the flow control valve further includes a nut structure, which has an internal thread that is engaged with the external thread. The external thread of the fourth rod segment 14 engages with the internal thread of the nut structure, connecting the spindle member to other parts of the flow control valve. The nut structure does not rotate circumferentially. When the screw 10 rotates, the screw 10 moves axially under the guidance of the threaded engagement, which in turn moves the valve head 40 accordingly, thereby opening and closing the valve port. The elastic member 60 can be provided to cushion and protect the valve head 40 and seal the valve head 40 against the valve port.

[0042] Specifically, the flow control valve is an electronic expansion valve. In this embodiment, the screw 10 includes a first rod segment 11, a second rod segment 12, and a third rod segment 13 connected in order, and the outer diameters of the rod segments in the screw 10 are the first rod segment 11, the second rod segment 12, and the third rod segment 13 in descending order. Here, the second rod segment 12 is the mounting segment of the bearing 20, and is clearance-fit, transition-fit, or interference-fit with the inner ring of the bearing 20, with the inner ring abutting against the step formed between the first rod segment 11 and the second rod segment 12; the third rod segment 13 is the mounting segment of the bushing 30, and is clearance-fit, transition-fit, or interference-fit with the inner hole of the bushing 30, with one end of the bushing 30 abutting against the inner ring of the bearing 20, and the bushing 30 can be fixed to the screw 10 by welding to form an integral unit. This structure avoids the problem in conventional electronic expansion valves that, when the bearing 20 is mounted on the spindle member, the inner ring of the bearing 20 is subjected to a relatively large force, which causes the retainer inside the bearing 20 to deform and stop the bearing 20 from rotating. It reduces the frictional force when the bearing 20 rotates, improving product performance.

[0043] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. a screw (10) including a first rod segment (11), a second rod segment (12), and a third rod segment (13) connected in order, the outer diameter of the first rod segment (11) being larger than the outer diameter of the second rod segment (12), and the outer diameter of the second rod segment (12) being larger than the outer diameter of the third rod segment (13); a bearing (20) fitted to the second rod segment (12); a bushing (30) fitted to the third rod segment (13), the bushing (30) being welded to the third rod segment (13), and two end surfaces of an inner ring of the bearing (20) being abutted against the end surfaces of the first rod segment (11) and the bushing (30), respectively; The spindle member is a valve head (40) having an assembly chamber (41), the bearing (20) being located within the assembly chamber (41); The spindle member is a limiting seat (50) provided in the assembly chamber (41), wherein the bushing (30) and the third rod segment (13) are both located within the chamber of the limiting seat (50), and the limiting seat (50) abuts against an outer ring of the bearing (20).

2. A screw (10) comprising a first rod segment (11), a second rod segment (12), and a third rod segment (13) connected in order, wherein the outer diameter of the first rod segment (11) is larger than the outer diameter of the second rod segment (12), and the outer diameter of the second rod segment (12) is larger than the outer diameter of the third rod segment (13); a bearing (20) fitted to the second rod segment (12); a bushing (30) fitted to the third rod segment (13), the bushing (30) being welded to the third rod segment (13), and two end surfaces of an inner ring of the bearing (20) being abutted against the end surfaces of the first rod segment (11) and the bushing (30), respectively; The screw (10), the bearing (20), and the bush (30) constitute a screw assembly, and the valve head (40) has a sealing end (42) for closing a valve port. The spindle member is a valve head (40) having an assembly chamber (41), the bearing (20) being located within the assembly chamber (41); The valve head further includes a pressure sleeve (70) provided at one end remote from the sealing end (42), and one end of the pressure sleeve (70) close to the sealing end (42) abuts against the screw assembly, thereby restricting the screw assembly by the pressure sleeve (70); The pressure sleeve (70) has an annular structure, and the pressure sleeve (70) and the valve head (40) are interference-fitted or welded to each other.

3. 3. The spindle member according to claim 1, wherein the length of the second rod segment (12) in the axial direction of the screw (10) is M, the length of the inner ring is N, and M<N.

4. The spindle member according to claim 3 , wherein M≧N / 2.

5. 3. The spindle member according to claim 1, wherein the inner diameter of the bushing (30) is larger than the outer diameter of the third rod segment (13), or the inner diameter of the bushing (30) is equal to the outer diameter of the third rod segment (13), or the inner diameter of the bushing (30) is smaller than the outer diameter of the third rod segment (13).

6. 3. The spindle assembly according to claim 1, wherein the outer diameter of the bushing (30) and the outer diameter of the first rod segment (11) are both smaller than the inner diameter of the outer ring of the bearing (20).

7. 3. The spindle member according to claim 1 or 2, further comprising an elastic member (60) provided in the assembly chamber (41), one end of which abuts against the limiting seat (50) and the other end of which abuts against a bottom wall of the assembly chamber (41).

8. 8. The spindle assembly according to claim 7, wherein the limiting seat (50) includes a limiting sleeve (51) and a limiting protrusion (52) provided at one end of the limiting sleeve (51), the bearing (20) and the third rod segment (13) are both located within the limiting sleeve (51), the limiting sleeve (51) abuts against the outer ring, the elastic member (60) is a spring, and the limiting protrusion (52) penetrates into the elastic member (60).

9. The screw (10), the bearing (20), and the bush (30) constitute a screw assembly, and the valve head (40) has a sealing end (42) for closing a valve port. The spindle member is 2. The spindle member according to claim 1, further comprising a pressure sleeve (70) provided at one end of the valve head (40) remote from the sealing end (42), wherein one end of the pressure sleeve (70) adjacent to the sealing end (42) abuts against the screw assembly, thereby restricting the screw assembly by the pressure sleeve (70).

10. 10. The spindle member according to claim 9, wherein the pressure sleeve (70) is an annular structure, and the pressure sleeve (70) and the valve head (40) are interference-fitted or welded together.

11. 10. The spindle member of claim 2 or 9, wherein the assembly chamber (41) includes a first chamber segment (411) and a second chamber segment (412), and the cross-sectional area of ​​the second chamber segment (412) is larger than the cross-sectional area of ​​the first chamber segment (411) along the extension direction of the valve head (40), thereby forming a step surface (413) between the first chamber segment (411) and the second chamber segment (412), and the pressing sleeve (70) abuts against the step surface (413).

12. 12. The spindle member according to claim 11, wherein the pressure sleeve (70) has an accommodating passage (71) therein, and the cross-sectional area of ​​the accommodating passage (71) is smaller than the cross-sectional area of ​​the first chamber segment (411) along the extension direction of the valve head (40), thereby forming a limiting surface between the pressure sleeve (70) and the first chamber segment (411) for abutting against the screw assembly.

13. 8. The spindle member according to claim 7, wherein the assembly chamber (41) includes a third chamber segment (414), and the elastic member (60) is inserted into the third chamber segment (414).

14. 14. The spindle member of claim 13, wherein the valve head (40) has a sealing end (42) for closing a valve port, and the assembly chamber (41) further includes a transition segment (415), the transition segment (415) being located on one side of the third chamber segment (414) away from the sealing end (42), and the cross-sectional area of ​​the transition segment (415) gradually decreasing along a direction approaching the sealing end (42) of the valve head (40).

15. A flow rate control valve comprising the spindle member according to claim 1 or 2.

16. 16. The flow control valve according to claim 15, wherein the screw (10) of the spindle member further includes a fourth rod segment (14), the fourth rod segment (14) is connected to the first rod segment (11), the fourth rod segment (14) has an external thread, and the flow control valve further includes a nut structure, the nut structure has an internal thread, and the internal thread and the external thread are engaged with each other.

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