Flow regulating valve

Abstract

This invention provides a flow regulating valve, comprising: a main valve seat, which includes a first cylindrical section, a second cylindrical section, a third cylindrical section, and a fourth cylindrical section connected in sequence, wherein the inner diameters of the first, second, third, and fourth cylindrical sections increase sequentially, and the inner wall surfaces of the second and fourth cylindrical sections are coaxially arranged; a guide sleeve, disposed within the cavity of the main valve seat, wherein the outer wall surface of the guide sleeve is in a limiting fit with the inner wall surface of the second cylindrical section, and the end face of the first cylindrical section abuts against the guide sleeve; and an auxiliary valve seat, having a valve port, wherein the outer wall surface of the auxiliary valve seat is in a limiting fit with the inner wall surface of the fourth cylindrical section, and the end face of the fourth cylindrical section abuts against the auxiliary valve seat. The technical solution provided by this invention solves the problem in the prior art where the main valve seat in a flow regulating valve requires two clamping and machining operations, and the coaxiality of the main valve seat, guide sleeve, and auxiliary valve seat is poor, affecting valve opening performance and lifespan.

Description

Technical Field

[0001] This invention relates to the field of flow control valve technology, and more specifically, to a flow control valve. Background Technology

[0002] Currently, for the assembly of the main valve seat, guide sleeve, and auxiliary valve seat in existing flow control valves, a boss is usually set on the upper part of the main valve seat. The guide sleeve is axially limited by the limiting fit between the upper part of the boss and the upper cylindrical section. That is, the guide sleeve is installed from the upper part of the main valve seat. The auxiliary valve seat is installed from the lower part of the main valve seat by the limiting fit between the lower cylindrical section of the main valve seat and the auxiliary valve seat.

[0003] In the above method, the upper and lower cylindrical sections of the main valve seat need to be machined in two separate clamping operations, resulting in relatively poor coaxiality, which affects valve opening performance and service life. Summary of the Invention

[0004] This invention provides a flow regulating valve to solve the problem of poor coaxiality of the main valve seat, guide sleeve, and auxiliary valve seat in the prior art flow regulating valve.

[0005] To address the aforementioned problems, this invention provides a flow regulating valve, comprising: a main valve seat, which includes a first cylindrical section, a second cylindrical section, a third cylindrical section, and a fourth cylindrical section connected in sequence, wherein the inner diameters of the first cylindrical section, the second cylindrical section, the third cylindrical section, and the fourth cylindrical section increase sequentially, and the inner wall surfaces of the second cylindrical section and the fourth cylindrical section are coaxially arranged; a guide sleeve, disposed within the cavity of the main valve seat, wherein the outer wall surface of the guide sleeve is in a limiting fit with the inner wall surface of the second cylindrical section, and the end face of the first cylindrical section abuts against the guide sleeve; and an auxiliary valve seat, which has a valve port, wherein the outer wall surface of the auxiliary valve seat is in a limiting fit with the inner wall surface of the fourth cylindrical section, and the end face of the fourth cylindrical section abuts against the auxiliary valve seat.

[0006] Furthermore, the inner wall surfaces of the first cylindrical section and the third cylindrical section are coaxially arranged with the inner wall surface of the second cylindrical section.

[0007] Furthermore, the guide sleeve includes a first guide segment and a second guide segment connected in sequence. The outer diameter of the first guide segment is smaller than the outer diameter of the second guide segment. The outer wall surface of the first guide segment and the inner wall surface of the first cylindrical segment are in a limiting fit, and the outer wall surface of the second guide segment and the inner wall surface of the second cylindrical segment are in a limiting fit.

[0008] Furthermore, the guide sleeve also includes a third guide section, which is located on the side of the first guide section opposite to the second guide section. The outer diameter of the third guide section is smaller than that of the first guide section. The third guide section, the first guide section, and the second guide section are coaxially arranged. The flow regulating valve also includes a nut structure with an assembly hole, into which the third guide section passes.

[0009] Furthermore, the flow regulating valve also includes: a nut structure, which is matched with a guide sleeve for limiting; a connecting plate, which is fixedly connected to the nut structure, and the connecting plate is fixedly connected to the main valve seat.

[0010] Furthermore, the main valve seat also includes a fifth cylindrical section, which is located on the side of the first cylindrical section away from the second cylindrical section. The inner diameter of the fifth cylindrical section is larger than that of the first cylindrical section. One end of the nut structure extends into the fifth cylindrical section, and the connecting plate is welded to the fifth cylindrical section.

[0011] Furthermore, the flow regulating valve also includes: a valve head, movably disposed within the cavity of the main valve seat, for opening or closing the valve port, a portion of which extends into a guide sleeve.

[0012] Furthermore, the flow regulating valve also includes: a valve needle assembly, which includes a screw, a bearing, and a bushing. The screw includes a first rod section, a second rod section, and a third rod section connected in sequence. The outer diameter of the first rod section is larger than the outer diameter of the second rod section, and the outer diameter of the second rod section is larger than the outer diameter of the third rod section. The bearing is sleeved on the second rod section. The bushing is sleeved on the third rod section, and the bushing and the third rod section are fixedly connected. The two end faces of the inner ring of the bearing abut against the end faces of the second rod section and the bushing, respectively. The bearing is located in the cavity of the valve head.

[0013] Furthermore, along the axial direction of the screw, the length of the second segment is M, the length of the inner ring is N, and N / 2 ≤ M < N.

[0014] Furthermore, the flow control valve is an electronic expansion valve.

[0015] The present invention provides a flow regulating valve, comprising: a main valve seat, the main valve seat comprising a first cylindrical section, a second cylindrical section, a third cylindrical section and a fourth cylindrical section connected in sequence, wherein the inner diameters of the first cylindrical section, the second cylindrical section, the third cylindrical section and the fourth cylindrical section increase sequentially, wherein the inner wall surface of the second cylindrical section and the inner wall surface of the fourth cylindrical section are coaxially arranged; a guide sleeve disposed in the cavity of the main valve seat, wherein the outer wall surface of the guide sleeve is in limiting fit with the inner wall surface of the second cylindrical section, and the end face of the first cylindrical section abuts against the guide sleeve; and an auxiliary valve seat, the auxiliary valve seat having a valve port, wherein the outer wall surface of the auxiliary valve seat is in limiting fit with the inner wall surface of the fourth cylindrical section, and the end face of the fourth cylindrical section abuts against the auxiliary valve seat. This design allows for sequentially increasing inner diameters of the cylindrical sections connected to the main valve seat. When machining the second and fourth cylindrical sections, the main valve seat can be clamped in one operation and machined from one end, eliminating the need for separate clamping and machining from both ends. This improves the coaxiality of the second and fourth cylindrical sections compared to existing technologies. Further assembly of the guide sleeve and auxiliary valve seat further enhances the coaxiality of the main valve seat, guide sleeve, and auxiliary valve seat, thereby improving the opening performance and lifespan of the flow control valve. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the flow regulating valve provided in an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 Enlarged view of the selected location of the medium flow regulating valve;

[0019] Figure 3 It shows Figure 1 Schematic diagram of the main valve seat of the medium flow regulating valve;

[0020] Figure 4 It shows Figure 1 A schematic diagram of the guide sleeve of a medium flow regulating valve.

[0021] The above figures include the following reference numerals:

[0022] 10. Main valve seat; 11. First cylindrical section; 12. Second cylindrical section; 13. Third cylindrical section; 14. Fourth cylindrical section; 15. Fifth cylindrical section; 20. Guide sleeve; 21. First guide section; 22. Second guide section; 23. Third guide section; 30. Auxiliary valve seat; 31. Valve port; 40. Nut structure; 50. Connecting plate; 60. Valve head. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 4As shown, an embodiment of the present invention provides a flow regulating valve, comprising: a main valve seat 10, the main valve seat 10 comprising a first cylindrical section 11, a second cylindrical section 12, a third cylindrical section 13, and a fourth cylindrical section 14 connected in sequence, wherein the inner diameters of the first cylindrical section 11, the second cylindrical section 12, the third cylindrical section 13, and the fourth cylindrical section 14 increase sequentially, wherein the inner wall surface of the second cylindrical section 12 and the inner wall surface of the fourth cylindrical section 14 are coaxially arranged; a guide sleeve 20, disposed in the cavity of the main valve seat 10, wherein the outer wall surface of the guide sleeve 20 is in limiting fit with the inner wall surface of the second cylindrical section 12, and the end face of the first cylindrical section 11 abuts against the guide sleeve 20; and an auxiliary valve seat 30, the auxiliary valve seat 30 having a valve port 31, wherein the outer wall surface of the auxiliary valve seat 30 is in limiting fit with the inner wall surface of the fourth cylindrical section 14, and the end face of the fourth cylindrical section 14 abuts against the auxiliary valve seat 30.

[0025] In this embodiment, the main valve seat 10 of the flow control valve includes four cylindrical sections with progressively increasing inner diameters connected in sequence. A guide sleeve 20 is disposed on the second cylindrical section 12 and abuts against the end face of the first cylindrical section 11. An auxiliary valve seat 30 is disposed on the fourth cylindrical section 14 and abuts against the end face of the fourth cylindrical section 14. Using this embodiment, the inner diameters of the cylindrical sections connected in sequence on the main valve seat 10 increase progressively. When machining the second cylindrical section 12 and the fourth cylindrical section 14, the main valve seat 10 can be clamped in one clamp and machined from one end of the main valve seat 10, eliminating the need for two separate clamping and machining operations from both ends of the main valve seat 10. Therefore, compared to the prior art, the coaxiality of the second cylindrical section 12 and the fourth cylindrical section 14 is improved. Then, by assembling the guide sleeve 20 and the auxiliary valve seat 30, the coaxiality of the main valve seat 10, the guide sleeve 20, and the auxiliary valve seat 30 is further improved, thereby enhancing the opening performance and lifespan of the flow control valve.

[0026] Depend on Figure 3 As shown, the inner wall surfaces of the first cylindrical section 11 and the third cylindrical section 13 are coaxially arranged with the inner wall surface of the second cylindrical section 12. Combined with the above description that the inner wall surface of the fourth cylindrical section 14 is coaxial with the inner wall surface of the second cylindrical section 12, it can be seen that all four cylindrical sections on the main valve seat 10 are coaxially arranged. During processing, only one clamping is needed to complete the processing of all four cylindrical sections, simplifying the operation, saving clamping and processing time, and ensuring coaxiality.

[0027] like Figure 4As shown, the guide sleeve 20 includes a first guide section 21 and a second guide section 22 connected in sequence. The outer diameter of the first guide section 21 is smaller than the outer diameter of the second guide section 22. The outer wall surface of the first guide section 21 and the inner wall surface of the first cylindrical section 11 are in a limiting fit, and the outer wall surface of the second guide section 22 and the inner wall surface of the second cylindrical section 12 are in a limiting fit. The guide sleeve 20 is limited and positioned within the cavity of the main valve seat 10 through the limiting fit between the two pairs of inner and outer wall surfaces. The stepped surface formed between the first guide section 21 and the second guide section 22 abuts against the stepped surface formed between the first cylindrical section 11 and the second cylindrical section 12, which can more stably limit the guide sleeve 20 within the main valve seat 10.

[0028] Specifically, the guide sleeve 20 also includes a third guide section 23, which is located on the side of the first guide section 21 opposite to the second guide section 22. The outer diameter of the third guide section 23 is smaller than that of the first guide section 21, and the third guide section 23, the first guide section 21, and the second guide section 22 are coaxially arranged. The flow regulating valve also includes a nut structure 40, which has an assembly hole into which the third guide section 23 passes. The outer diameters of the three guide sections in the guide sleeve 20, from largest to smallest, are the second guide section 22, the first guide section 21, and the third guide section 23, and the three guide sections are coaxially arranged. During processing, the processing of the three guide sections of the guide sleeve 20 can be completed in one clamping, saving clamping time and ensuring the coaxiality between the guide sleeve 20 and the main valve seat 10. The third guide section 23 passes into the assembly hole on the nut structure 40 and is limited by the inner wall of the assembly hole, ensuring the stability of the assembly and ensuring the coaxiality between the center of the nut structure 40 and the guide sleeve 20.

[0029] like Figure 1 and Figure 2 As shown, the flow regulating valve also includes: a nut structure 40, which is mutually restrictive with the guide sleeve 20; and a connecting plate 50, which is fixedly connected to the nut structure 40 and the main valve seat 10. The restrictive fit between the nut structure 40 and the guide sleeve 20 ensures the coaxiality between each guide section of the guide sleeve 20 and the nut structure 40, and also ensures the coaxiality between the nut structure 40, the guide sleeve 20, the main valve seat 10, and the auxiliary valve seat 30, thus improving valve opening performance and extending product life. The connecting plate 50 is fixedly connected to both the nut structure 40 and the main valve seat 10, ensuring a stable connection between them. Furthermore, in this design, the connecting plate 50 does not need to be connected to the guide sleeve 20, eliminating the need for an annular groove on the guide sleeve 20 to accommodate the end of the nut structure 40, reducing processing difficulty and thus lowering costs. Specifically, the connecting plate 50 and the nut structure 40 are integrated using injection molding.

[0030] Specifically, the main valve seat 10 also includes a fifth cylindrical section 15, which is located on the side of the first cylindrical section 11 opposite to the second cylindrical section 12. The inner diameter of the fifth cylindrical section 15 is larger than the inner diameter of the first cylindrical section 11. One end of the nut structure 40 extends into the fifth cylindrical section 15, and the connecting plate 50 is welded to the fifth cylindrical section 15. Compared to the prior art, where the connecting plate 50 is welded to the guide sleeve 20 and a groove needs to be machined on the guide sleeve 20 to avoid the end of the nut structure 40, in this embodiment, the connecting plate 50 is instead welded to the fifth cylindrical section 15 on the main valve seat 10, and the guide sleeve 20 does not need to be machined with a groove, making the manufacturing process simpler.

[0031] like Figure 1 As shown, the flow regulating valve also includes a valve head 60, which is movably disposed within the cavity of the main valve seat 10 to open or close the valve port 31. A portion of the valve head 60 extends into the guide sleeve 20. The movement of the valve head 60 is controlled by a drive structure connected to the valve head 60, thereby opening and closing the valve port 31 and thus regulating the flow rate.

[0032] Specifically, the flow regulating valve further includes: a valve needle assembly, which includes a screw, a bearing, and a bushing. The screw includes a first rod section, a second rod section, and a third rod section connected in sequence. The outer diameter of the first rod section is larger than the outer diameter of the second rod section, and the outer diameter of the second rod section is larger than the outer diameter of the third rod section. The bearing is sleeved on the second rod section. The bushing is sleeved on the third rod section, and the bushing and the third rod section are fixedly connected. The two end faces of the inner ring of the bearing abut against the end faces of the second rod section and the bushing, respectively. The bearing is located in the cavity of the valve head 60.

[0033] In this embodiment, the third rod segment is a bushing mounting segment, which is fitted with the inner hole of the bushing with clearance, transition, or interference. One end of the bushing abuts against the inner ring of the bearing and can be fixed to the screw as a whole by welding. The second segment is a bearing mounting segment, which is fitted with the inner ring of the bearing with clearance, transition, or interference. The two ends of the inner ring of the bearing abut against the end face of the second rod segment and the bushing, respectively. In this way, the bushing achieves axial limiting of the inner ring of the bearing, avoiding excessive force and deformation of the inner ring of the bearing caused by other limiting methods, ensuring the reliability of the bearing and improving the performance of the regulating valve.

[0034] Furthermore, in the axial direction of the screw, the length of the second segment is M, and the length of the inner ring is N, where N / 2 ≤ M < N. The length of the second segment is slightly less than the length of the bearing inner ring, which ensures that the bushing abuts against the bearing and prevents axial movement of the bearing.

[0035] Specifically, the flow regulating valve in the above embodiment is an electronic expansion valve. Using the above embodiment, the inner diameters of the cylindrical sections connected sequentially on the main valve seat 10 increase sequentially. When machining the second cylindrical section 12 and the fourth cylindrical section 14, the main valve seat 10 can be clamped at once and machined from one end, eliminating the need for two separate clamping and machining operations at both ends. Therefore, compared to the prior art, the coaxiality of the second cylindrical section 12 and the fourth cylindrical section 14 is improved. Then, by assembling the guide sleeve 20 and the auxiliary valve seat 30, the coaxiality of the main valve seat 10, the guide sleeve 20, and the auxiliary valve seat 30 is further improved, thereby enhancing the opening performance and lifespan of the electronic expansion valve.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow regulating valve, characterized in that, include: The main valve seat (10) includes a first cylindrical section (11), a second cylindrical section (12), a third cylindrical section (13), and a fourth cylindrical section (14) connected in sequence. The inner diameters of the first cylindrical section (11), the second cylindrical section (12), the third cylindrical section (13), and the fourth cylindrical section (14) increase sequentially. The inner wall surface of the second cylindrical section (12) and the inner wall surface of the fourth cylindrical section (14) are coaxially arranged. A guide sleeve (20) is disposed in the cavity of the main valve seat (10). The outer wall surface of the guide sleeve (20) and the inner wall surface of the second cylindrical section (12) are in a limiting fit. The end face of the first cylindrical section (11) abuts against the guide sleeve (20). Auxiliary valve seat (30) has a valve port (31), the outer wall surface of the auxiliary valve seat (30) and the inner wall surface of the fourth cylindrical section (14) are in a limiting fit, and the end face of the fourth cylindrical section (14) abuts against the auxiliary valve seat (30). Nut structure (40), wherein the nut structure (40) and the guide sleeve (20) are in a limiting fit; The connecting plate (50) is fixedly connected to the nut structure (40), and the connecting plate (50) is fixedly connected to the main valve seat (10); The flow regulating valve is an electronic expansion valve.

2. The flow regulating valve according to claim 1, characterized in that, The inner wall surface of the first cylindrical segment (11) and the inner wall surface of the third cylindrical segment (13) are coaxially arranged with the inner wall surface of the second cylindrical segment (12).

3. The flow regulating valve according to claim 1, characterized in that, The guide sleeve (20) includes a first guide section (21) and a second guide section (22) connected in sequence. The outer diameter of the first guide section (21) is smaller than the outer diameter of the second guide section (22). The outer wall surface of the first guide section (21) and the inner wall surface of the first cylindrical section (11) are in a limiting fit, and the outer wall surface of the second guide section (22) and the inner wall surface of the second cylindrical section (12) are in a limiting fit.

4. The flow regulating valve according to claim 3, characterized in that, The guide sleeve (20) further includes a third guide section (23), which is located on the side of the first guide section (21) opposite to the second guide section (22). The outer diameter of the third guide section (23) is smaller than the outer diameter of the first guide section (21). The third guide section (23), the first guide section (21), and the second guide section (22) are coaxially arranged. The flow regulating valve further includes: The nut structure (40) has an assembly hole, and the third guide section (23) passes through the assembly hole.

5. The flow regulating valve according to claim 1, characterized in that, The main valve seat (10) also includes a fifth cylindrical section (15), which is located on the side of the first cylindrical section (11) away from the second cylindrical section (12). The inner diameter of the fifth cylindrical section (15) is larger than the inner diameter of the first cylindrical section (11). One end of the nut structure (40) extends into the fifth cylindrical section (15), and the connecting plate (50) is welded to the fifth cylindrical section (15).

6. The flow regulating valve according to claim 1, characterized in that, The flow regulating valve also includes: A valve head (60) is movably disposed in the cavity of the main valve seat (10) to open or close the valve port (31), and a portion of the valve head (60) extends into the guide sleeve (20).

7. The flow regulating valve according to claim 6, characterized in that, The flow regulating valve also includes: The valve needle assembly includes a screw, a bearing, and a bushing. The screw includes a first rod segment, a second rod segment, and a third rod segment connected in sequence. 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. The bearing is sleeved on the second rod segment. The bushing is sleeved on the third rod segment. The bushing and the third rod segment are fixedly connected. The two end faces of the inner ring of the bearing abut against the end faces of the second rod segment and the end faces of the bushing, respectively. The bearing is located in the cavity of the valve head (60).

8. The flow regulating valve according to claim 7, characterized in that, Along the axial direction of the screw, the length of the second rod segment is M, and the length of the inner ring is N, where N / 2 ≤ M < N.

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