Flow control valve and manufacturing method

Abstract

The present invention provides a flow control valve and a manufacturing method, the flow control valve comprising: a main valve seat, the main valve seat having an accommodating cavity; an auxiliary valve seat, the auxiliary valve seat having a first mounting groove, the auxiliary valve seat and the main valve seat having an interference fit, the interference between the auxiliary valve seat and the main valve seat being a, a≤0.04mm; a sealing gasket, the sealing gasket being arranged in the first mounting groove, the inner diameter of the sealing gasket being D1, the inner diameter of the first mounting groove being D2, |D1‑D2|≤0.04mm, the sealing gasket having a valve port between the sealing gasket and the first mounting groove, the valve port being connected to the accommodating cavity. The technical solution provided by the present invention can improve the coaxiality among the main valve seat, the auxiliary valve seat and the sealing gasket, thereby ensuring the reliability of the valve port position and improving the performance and reliability of the flow control valve.

Description

Technical Field

[0001] The present invention relates to the technical field of flow control valves, and in particular to a flow control valve and a manufacturing method thereof. Background Art

[0002] The flow control valve in the prior art usually adopts a method of installing a sealing gasket on the auxiliary valve seat and setting a valve port on the sealing gasket. However, this method of sealing with a sealing gasket may result in inaccurate installation position of the sealing gasket, which in turn causes the installation position of the valve port on the sealing gasket to deviate, affecting the sealing effect of the flow control valve. Summary of the Invention

[0003] The present invention provides a flow regulating valve and a manufacturing method thereof, so as to improve the installation accuracy of a valve port in the flow regulating valve.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, the present invention provides a flow regulating valve, including: a main valve seat, the main valve seat having an accommodating cavity; an auxiliary valve seat, the auxiliary valve seat having a first mounting groove, the auxiliary valve seat and the main valve seat having an interference fit, the interference amount between the auxiliary valve seat and the main valve seat being a, a≤0.04mm; a sealing gasket, the sealing gasket being arranged in the first mounting groove, the outer diameter of the sealing gasket being D1, the inner diameter of the first mounting groove being D2, |D1-D2|≤0.04mm, the sealing gasket having a valve port, and the valve port being connected to the accommodating cavity.

[0005] Furthermore, the flow regulating valve also includes a valve head, which is movably arranged in the accommodating cavity to block or open the valve port, and there is a gap b between the outer wall of the valve head and the inner wall of the accommodating cavity, 0.01mm≤b≤0.04mm.

[0006] Furthermore, the flow regulating valve also includes a valve needle structure and a nut. The valve needle structure includes a screw. The valve head sleeve is arranged at one end of the screw. The screw is arranged through the nut. The nut has an assembly hole. There is a gap c between the outer wall of the screw and the inner wall of the assembly hole, 0.01mm≤c≤0.04mm.

[0007] Furthermore, the main valve seat includes a main valve body and a limiting section that are connected to each other. The cavities of the main valve body and the limiting section together constitute a accommodating cavity. The nut has a first cylinder and a second cylinder that are connected to each other. The radial dimension of the second cylinder is larger than the radial dimension of the first cylinder. The assembly hole is located in the first cylinder. The second cylinder is sleeved on the limiting section. The inner diameter of the second cylinder is D3, and the outer diameter of the limiting section is D4. |D3-D4|≤0.04mm.

[0008] Furthermore, the accommodating chamber includes a limiting hole section, a guide hole section and a valve chamber that are connected in sequence. The cavity of the limiting section forms a limiting hole section. The guide hole section and the valve chamber are located in the main valve body. The outer wall of the valve head is limitedly matched with the inner wall of the guide hole section. The valve port and the valve chamber are connected, and the main valve seat is an integrally formed structure.

[0009] Furthermore, the screw includes a first rod segment, a second rod segment and a third rod segment which are connected in sequence and whose radial dimensions increase in sequence. The outer wall of the third rod segment and the inner wall of the limiting hole segment are limitedly matched; the valve needle structure also includes a bushing, a bearing and a press sleeve. The bushing is sleeved on the first rod segment and fixedly connected to the first rod segment; the bearing is sleeved on the second rod segment, and the two ends of the inner ring of the bearing are respectively abutted against the end face of the third rod segment and the end face of the bushing; the press sleeve is fixedly connected to the cavity of the valve head, and one end of the press sleeve is abutted against the outer ring of the bearing toward the end face of the third rod segment.

[0010] Furthermore, the screw has a first balancing hole, the valve head has a second balancing hole, and the nut has a third balancing hole. The first balancing hole is connected to the second balancing hole and the third balancing hole respectively, and the second balancing hole is connected to the accommodating cavity.

[0011] Furthermore, the flow areas of the first balancing hole, the second balancing hole and the third balancing hole are all S1, the accommodating cavity includes a limiting hole section, the outer wall of the screw is limitedly matched with the inner wall of the limiting hole section, and the flow area of ​​the area between the outer wall of the screw and the inner wall of the limiting hole section is S2, S2≥S1.

[0012] Furthermore, the valve head includes a guide head, a rod body and a sealing head connected in sequence. The radial dimension of the rod body is smaller than the radial dimension of the guide head and the sealing head. The outer wall of the guide head is gap-matched with the inner wall of the accommodating cavity. The sealing head is used to seal the valve port. The outer wall of the guide head has an annular groove. The flow regulating valve also has an annular sealing ring, which is arranged in the annular groove. The outer ring of the annular sealing ring is sealed with the inner wall of the accommodating cavity.

[0013] Furthermore, the side wall of the main valve seat is provided with a flow hole, which is connected to the accommodating cavity. The auxiliary valve seat also has a second mounting groove, which is connected to the valve port. The flow regulating valve also includes a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is passed through the flow hole, and the other end of the second connecting pipe is passed through the second mounting groove.

[0014] Furthermore, the auxiliary valve seat includes an auxiliary valve body connected to each other and an annular boss arranged on the auxiliary valve body. The auxiliary valve seat also has a flange structure, which is connected to the annular boss. The flange structure is an annular structure, and the flange structure and the sealing gasket are limited.

[0015] According to another aspect of the present invention, a manufacturing method is provided, which is used to manufacture the above-mentioned flow control valve, and the manufacturing method includes: S10: connecting the first connecting pipe and the main valve seat; S20: connecting the valve needle structure and the valve head; S30: inserting the structure assembled in S20 into the main valve seat, wherein the guide section of the valve head is installed in the wire hole section of the main valve seat; S40: screwing the nut onto the screw of the valve needle structure; S50: press-fitting the nut onto the main valve seat and welding it to the main valve seat; S60: connecting the second connecting pipe and the auxiliary valve seat; S70: connecting the auxiliary valve seat and the main valve seat.

[0016] Applying the technical solution of the present invention, a flow regulating valve is provided, including: a main valve seat, having an accommodating cavity therein; an auxiliary valve seat, having a first mounting groove, the auxiliary valve seat and the main valve seat having an interference fit, the interference amount between the auxiliary valve seat and the main valve seat being a, a≤0.04mm; a sealing gasket, the sealing gasket being arranged in the first mounting groove, the outer diameter of the sealing gasket being D1, the inner diameter of the first mounting groove being D2, |D1-D2|≤0.04mm, the sealing gasket having a valve port, the valve port being connected to the accommodating cavity; a valve head, the valve head being movably arranged in the accommodating cavity to seal or open the valve port, the outer wall of the valve head and the inner wall of the accommodating cavity having a clearance fit, the clearance amount being b, 0.02mm≤b≤0.08mm. This solution first improves the coaxiality between the main and auxiliary valve seats by limiting the interference fit a. Then, by limiting the relationship between D1 and D2, it improves the coaxiality between the sealing gasket and the auxiliary valve seat. This, in turn, improves the coaxiality between the valve port and the auxiliary valve seat, thereby enhancing the reliability of the valve port position. The combined effect of these two sets of limiting relationships improves the installation accuracy of the auxiliary valve seat, sealing gasket, and main valve seat, ensuring that the valve port position does not deviate and that the flow control valve is leak-tight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic structural diagram of a flow control valve provided by an embodiment of the present invention is shown;

[0019] Figure 2 Shown Figure 1 Schematic diagram of the structure of the main valve seat in the flow control valve;

[0020] Figure 3 Shown Figure 1 Schematic diagram of the structure of the auxiliary valve seat in the flow control valve;

[0021] Figure 4 Shown Figure 1Schematic diagram of the assembly of the valve needle structure and valve head in the flow control valve;

[0022] Figure 5 Shown Figure 1 A schematic diagram of the structure of a nut in a flow control valve;

[0023] Figure 6 Shown Figure 1 Schematic diagram of the structure of the sealing gasket in the flow control valve.

[0024] The above drawings include the following reference numerals:

[0025] 10. Main valve seat; 11. Accommodating cavity; 111. Position limiting hole section; 112. Guide hole section; 113. Valve cavity; 12. Main valve body; 13. Position limiting section; 14. Flow hole;

[0026] 20. Auxiliary valve seat; 21. First mounting groove; 22. Second mounting groove; 23. Auxiliary valve body; 24. Annular boss; 25. Flanged structure; 26. Connecting hole;

[0027] 30. Sealing gasket; 31. Valve port; 311. Diversion hole section; 312. Sealing hole section; 313. Flow hole section;

[0028] 40. Valve head; 41. Second balancing hole; 42. Guide head; 43. Rod body; 44. Sealing head; 45. Annular groove;

[0029] 50. Valve needle structure; 51. Screw; 511. First rod segment; 512. Second rod segment; 513. Third rod segment; 514. First balancing hole; 515. Fourth rod segment; 516. Fifth rod segment; 52. Bushing; 53. Bearing; 54. Press sleeve;

[0030] 60, nut; 61, assembly hole; 62, first cylinder; 621, assembly cylinder section; 622, connecting cylinder section; 63, second cylinder;

[0031] 70. Annular sealing ring;

[0032] 81. First takeover; 82. Second takeover;

[0033] 90. Valve cylinder; 91. Sealing chamber. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 6 As shown, an embodiment of the present invention provides a flow regulating valve, including: a main valve seat 10, the main valve seat 10 has an accommodating cavity 11; an auxiliary valve seat 20, the auxiliary valve seat 20 has a first mounting groove 21, the auxiliary valve seat 20 and the main valve seat 10 are interference fit, and the interference amount between the auxiliary valve seat 20 and the main valve seat 10 is a, a≤0.04mm; a sealing gasket 30, the sealing gasket 30 is arranged in the first mounting groove 21, the inner diameter of the sealing gasket 30 is D1, the inner diameter of the first mounting groove 21 is D2, |D1-D2|≤0.04mm, the sealing gasket 30 has a valve port 31, and the valve port 31 is connected to the accommodating cavity 11.

[0036] In this embodiment, the coaxiality between the main valve seat 10 and the auxiliary valve seat 20 is first improved by limiting the interference fit a. Furthermore, by limiting the relationship between D1 and D2, the coaxiality between the sealing gasket 30 and the auxiliary valve seat 20 is improved. This, in turn, improves the coaxiality between the valve port 31 and the auxiliary valve seat 20, thereby enhancing the reliability of the position of the valve port 31. The combined effect of these two sets of limiting relationships improves the installation precision of the auxiliary valve seat 20, the sealing gasket 30, and the main valve seat 10, ensuring that the position of the valve port 31 does not deviate and that the flow control valve maintains its tightness.

[0037] Specifically, the gap b between the outer side wall of the valve head 40 and the inner side wall of the accommodating chamber 11 is a single-side gap.

[0038] Furthermore, the flow regulating valve also includes a valve head 40, which is movably arranged in the accommodating chamber 11 to block or open the valve port 31. There is a gap b between the outer wall of the valve head 40 and the inner wall of the accommodating chamber 11, 0.01mm≤b≤0.04mm.

[0039] In this embodiment, the coaxiality between the valve head 40 and the main valve seat 10 is improved by limiting the gap amount b. Combined with the limitation of the interference amount a and the limitation of the relationship between D1 and D2, the coaxiality between the valve port 31 and the valve head 40 is ultimately improved, ensuring that when the valve head 40 is in a blocked state, the sealing surface formed by the valve head 40 and the valve port 31 is complete and not prone to leakage. At the same time, it also ensures that the valve head 40 will not get stuck during movement, thereby improving the performance and reliability of the flow control valve.

[0040] like Figure 1 As shown, the flow control valve further includes a valve needle structure 50 and a nut 60. The valve needle structure 50 includes a screw 51. The valve head 40 is sleeved on one end of the screw 51. The screw 51 is inserted through the nut 60. The nut 60 has an assembly hole 61. A gap c is defined between the outer wall of the screw 51 and the inner wall of the assembly hole 61, with 0.01mm≤c≤0.04mm. This arrangement, by limiting the range of the gap c, improves the coaxiality between the valve needle structure 50 and the nut 60, further improving the coaxiality between the valve head 40 and the nut 60, and thus improving the performance of the flow control valve.

[0041] Specifically, the gap c between the outer side wall of the screw rod 51 and the inner side wall of the assembly hole 61 is a single-side gap.

[0042] like Figure 1 and Figure 2 As shown, the main valve seat 10 includes a main valve body 12 and a limiting section 13 that are interconnected. The cavities of the main valve body 12 and the limiting section 13 together constitute an accommodating chamber 11. The nut 60 has a first cylinder 62 and a second cylinder 63 that are interconnected. The radial dimension of the second cylinder 63 is larger than the radial dimension of the first cylinder 62. The assembly hole 61 is located in the first cylinder 62. The second cylinder 63 is sleeved on the limiting section 13. The inner diameter of the second cylinder 63 is D3, and the outer diameter of the limiting section 13 is D4. |D3-D4|≤0.04mm.

[0043] In this embodiment, by limiting the dimensional relationship between D3 and D4, the coaxiality between the nut 60 and the main valve seat 10 is improved. Combined with the limitation of the value range of the gap c, the coaxiality between the valve head 40 and the main valve seat 10 is further improved, thereby ensuring the reliability of the movement of the valve head 40.

[0044] Specifically, the accommodating chamber 11 includes a limiting hole section 111, a guide hole section 112 and a valve chamber 113 that are connected in sequence. The cavity of the limiting section 13 forms the limiting hole section 111. The guide hole section 112 and the valve chamber 113 are located in the main valve body 12. The outer wall of the valve head 40 is limited and matched with the inner wall of the guide hole section 112. The valve port 31 and the valve chamber 113 are connected, and the main valve seat 10 is an integrally molded structure.

[0045] In this embodiment, the main valve seat 10 is an integrally formed structure, which ensures the coaxiality between the limiting hole section 111, the guide hole section 112 and the valve cavity 113 in the accommodating cavity 11. In addition, this arrangement also ensures the coaxiality between the main valve body 12 and the limiting section 13, and further ensures the coaxiality between the nut 60, the main valve seat 10, the valve needle structure 50 and the valve head 40, thereby ensuring the reliability of the movement of the valve head 40 and improving the performance of the flow control valve.

[0046] like Figure 4 As shown, the screw rod 51 includes a first rod segment 511, a second rod segment 512 and a third rod segment 513 which are connected in sequence and whose radial dimensions increase in sequence. The outer wall of the third rod segment 513 and the inner wall of the limiting hole segment 111 are limitedly matched; the valve needle structure 50 also includes a bushing 52, a bearing 53 and a pressing sleeve 54. The bushing 52 is sleeved on the first rod segment 511 and fixedly connected to the first rod segment 511; the bearing 53 is sleeved on the second rod segment 512, and the two ends of the inner ring of the bearing 53 are respectively abutted against the end face of the third rod segment 513 and the end face of the bushing 52; the pressing sleeve 54 is fixedly connected to the cavity of the valve head 40, and one end of the pressing sleeve 54 is abutted against the outer ring of the bearing 53 toward the end face of the third rod segment 513.

[0047] In this embodiment, the first rod segment 511 is the installation segment of the bushing 52, which has a gap, transition or interference fit with the inner hole of the bushing 52. One end of the bushing 52 abuts against the inner ring of the bearing 53 and can be fixed to the screw 51 as a whole by welding. The second rod segment 512 is the installation segment of the bearing 53, which has a gap, transition or interference fit with the inner ring of the bearing 53. The two ends of the inner ring of the bearing 53 respectively abut the end face of the third rod segment 513 and the bushing 52. In this way, the axial limitation of the inner ring of the bearing 53 is achieved by the bushing 52, avoiding the deformation of the inner ring of the bearing 53 caused by excessive force when other limiting methods are used, thereby ensuring the reliability of the bearing 53. Then, the bearing 53 is further limited by the abutment of the press sleeve 54 with the outer ring end face of the bearing 53 to prevent the bearing 53 from moving, thereby improving the performance of the flow control valve.

[0048] Alternatively, as Figure 5 As shown, the first barrel 62 includes an assembly barrel section 621 and a connecting barrel section 622 that are connected to each other. The assembly hole 61 is located in the assembly barrel section 621. The inner diameter of the assembly barrel section 621 is smaller than the inner diameter of the connecting barrel section 622. The hole in the assembly barrel section 621 is the assembly hole 61. The connecting barrel section 622 has an internal thread. The screw 51 also includes a fourth rod section 515 and a fifth rod section 516 that are sequentially connected to the third rod section 513. The radial dimension of the fourth rod section 515 is greater than the radial dimension of the fifth rod section 516. The fourth rod section 515 has an external thread. The fourth rod section 515 is threadedly connected to the connecting barrel section 622. The fifth rod section 516 and the assembly barrel section 621 are clearance-fitted. The length of the connecting barrel section 622 is greater than the moving distance of the valve head 40 from the valve closing state to the valve opening state. This arrangement ensures the reliability of opening and closing the flow control valve.

[0049] Furthermore, the screw 51 has a first balancing hole 514 , the valve head 40 has a second balancing hole 41 , and the nut 60 has a third balancing hole. The first balancing hole 514 is connected to the second balancing hole 41 and the third balancing hole respectively, and the second balancing hole 41 is connected to the accommodating chamber 11 .

[0050] In this embodiment, the pressure of the cavity inside the flow control valve is regulated by setting the first balancing hole 514, the second balancing hole 41 and the third balancing hole, so that the pressure of each part inside the flow control valve is balanced, thereby ensuring the reliability of opening and closing the flow control valve.

[0051] Specifically, the flow regulating valve also includes a valve cylinder 90, one end of which is connected to the main valve seat 10, and the nut 60 is fixedly arranged in the valve cylinder 90. The mating part of the screw 51 and the nut 60 is located in the cavity of the valve cylinder 90. The cavity of the valve cylinder 90 is a sealed cavity 91, and the sealed cavity 91 is connected to the accommodating cavity 11 through the third balancing hole. In this way, the pressure balance between the accommodating cavity 11 and the sealed cavity 91 is achieved through the joint action of the first balancing hole 514, the second balancing hole 41 and the third balancing hole, thereby ensuring the reliability of opening and closing the flow regulating valve.

[0052] Furthermore, the flow areas of the first balancing hole 514, the second balancing hole 41 and the third balancing hole are all S1, the accommodating cavity 11 includes a limiting hole section 111, the outer wall of the screw 51 is limitedly matched with the inner wall of the limiting hole section 111, and the flow area of ​​the area between the outer wall of the screw 51 and the inner wall of the limiting hole section 111 is S2, S2≥S1.

[0053] In this embodiment, the first balancing hole 514 and the second balancing hole 41 are located in the accommodating chamber, and the third balancing hole is located in the sealing chamber 91. The accommodating chamber 11 and the sealing chamber 91 are connected through the gap between the screw 51 and the limiting hole section 111. The pressure balance at various positions in the accommodating chamber 11 and the sealing chamber 91 is achieved through the joint action of the gap and the three balancing holes. The flow areas of the first balancing hole 514, the second balancing hole 41 and the third balancing hole are equal and are all S1, ensuring that the flow rate and flow velocity of the fluid flowing through the three balancing holes are the same, thereby improving the efficiency of pressure balance. The flow area S2 of the area between the screw 51 and the limiting hole section 111 is greater than S1, ensuring that the flow rate through the flow area S2 is greater than the flow rate through the flow area S1, thereby avoiding the fluid flow being blocked and the pressure balance being slow due to the difference in flow rate through the flow area S1 and the flow rate through the flow area S2, thereby affecting the opening or closing of the flow regulating valve. This arrangement improves the efficiency of pressure balance in each cavity of the flow regulating valve during the opening or closing process, thereby improving the efficiency of opening and closing the valve, and improving the performance of the flow regulating valve.

[0054] like Figure 4As shown, the valve head 40 includes a guide head 42, a rod body 43 and a sealing head 44 connected in sequence. The radial dimension of the rod body 43 is smaller than the radial dimension of the guide head 42 and the sealing head 44. The outer wall of the guide head 42 is gap-fitted with the inner wall of the accommodating chamber 11. The sealing head 44 is used to seal the valve port 31. The outer wall of the guide head 42 has an annular groove 45. The flow regulating valve also has an annular sealing ring 70. The annular sealing ring 70 is arranged in the annular groove 45. The outer ring of the annular sealing ring 70 is sealingly fitted with the inner wall of the accommodating chamber 11.

[0055] In this embodiment, the clearance fit between the guide head 42 and the accommodating chamber 11 ensures that the valve head 40 will not deviate during the movement, thereby ensuring the reliability of the movement of the valve head 40; an annular sealing ring 70 is provided in the annular groove 45 of the outer wall of the guide head 42, which can ensure that the fluid in the accommodating chamber 11 will not enter the sealing chamber 91 of the valve cylinder 90 through the gap between the outer wall of the guide head 42 and the inner wall of the accommodating chamber 11, thereby ensuring the reliability of the flow regulating valve.

[0056] Alternatively, as Figure 6 As shown, the outer wall of the guide head 42 is gap-fitted with the inner wall of the guide hole section 112 in the accommodating chamber 11, and the valve port 31 includes a guide hole section 311, a sealing hole section 312 and a flow hole section 313 which are connected in sequence and whose radial dimensions decrease in sequence. The radial dimension of the guide hole section 311 gradually decreases in the direction from the sealing hole section 312 to the flow hole section 313, and the radial dimension of the sealing hole section 312 gradually decreases in the direction from the sealing hole section 312 to the flow hole section 313. When the valve port is in a closed state, the sealing head 44 fits with the sealing hole section 312 to form a sealing surface, thereby closing the valve port.

[0057] like Figures 1 to 3 As shown, the side wall of the main valve seat 10 is provided with a flow hole 14, which is connected to the accommodating chamber 11. The auxiliary valve seat 20 also has a second mounting groove 22, which is connected to the valve port 31. The flow regulating valve also includes a first connecting pipe 81 and a second connecting pipe 82. One end of the first connecting pipe 81 is passed through the flow hole 14, and the other end of the second connecting pipe 82 is passed through the second mounting groove 22.

[0058] In this embodiment, fluid flows from the first connecting pipe 81 into the valve cavity 113 of the accommodating chamber 11, then flows into the second connecting pipe 82 through the valve port 31 connected to the valve cavity 113, and finally flows out of the second connecting pipe 82. Specifically, the flow hole 14 is provided on the inner sidewall of the valve cavity 113, and the axes of the first connecting pipe 81 and the second connecting pipe 82 are arranged perpendicularly. This arrangement can improve the flow capacity of the fluid and enhance the performance of the flow control valve.

[0059] Optionally, the auxiliary valve seat also has a connecting hole 26, and the valve port 31, the connecting hole 26 and the second connecting pipe 82 are connected in sequence. The connecting hole 26 is located between the first mounting groove 21 and the second mounting groove 22. The radial dimension of the connecting hole 26 is smaller than the radial dimension of the first mounting groove 21 and the second mounting groove 22. A first plane is formed between the connecting hole 26 and the first mounting groove 21, and a second plane is formed by the diameter of the connecting hole 26 and the second mounting groove 22. The sealing gasket 30 installed in the first mounting groove 21 abuts against the first plane, and the second connecting pipe 82 installed in the second mounting groove 22 abuts against the second plane. This arrangement limits the depth of the sealing gasket 30 installed in the auxiliary valve seat 20 and the depth of the second connecting pipe 82 inserted into the auxiliary valve seat 20, while preventing interference between the sealing gasket 30 and the second connecting pipe 82 during the installation process, thereby ensuring the stability and reliability of the flow control valve.

[0060] like Figure 3 As shown, the auxiliary valve seat 20 includes an auxiliary valve body 23 connected to each other and an annular boss 24 arranged on the auxiliary valve body 23. The auxiliary valve seat 20 also has a flange structure 25, which is connected to the annular boss 24. The flange structure 25 is an annular structure, and the flange structure 25 and the sealing gasket 30 are limited and matched.

[0061] In this embodiment, the sealing gasket 30 is fixed in the auxiliary valve body 23 and the annular boss 24 by the flange structure 25, which prevents the sealing gasket 30 from shaking or rotating in the auxiliary valve seat 20, and also prevents the sealing gasket 30 from being deformed due to a large radial force. Moreover, with this arrangement, there is no need to use the main valve seat 10 to limit the sealing gasket 30. In this way, the wall thickness of the main valve seat 10 can be made relatively thin, and the flange form is used to facilitate assembly operations, thereby reducing the cost of the flow control valve.

[0062] Another embodiment of the present invention provides a manufacturing method for manufacturing the above-mentioned flow control valve, comprising: S10: connecting the first connecting pipe 81 to the main valve seat 10; S20: connecting the valve needle structure 50 to the valve head 40; S30: inserting the structure assembled in S20 into the main valve seat 10, wherein the guide section of the valve head 40 is installed in the wire hole section of the main valve seat 10; S40: screwing the nut 60 onto the screw 51 of the valve needle structure 50; S50: press-fitting the nut 60 onto the main valve seat 10 and welding it to the main valve seat 10; S60: connecting the second connecting pipe 82 to the auxiliary valve seat 20; S70: connecting the auxiliary valve seat 20 to the main valve seat 10. This arrangement ensures the reliability and smoothness of installation, avoids interference between the various components in the flow control valve during installation, and ensures the reliability of the flow control valve.

[0063] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A flow control valve, characterized in that: include: A main valve seat (10), wherein the main valve seat (10) has an accommodating cavity (11); An auxiliary valve seat (20), the auxiliary valve seat (20) having a first mounting groove (21), the auxiliary valve seat (20) and the main valve seat (10) being interference-fitted, the interference between the auxiliary valve seat (20) and the main valve seat (10) being a, a≤0.04 mm; a sealing gasket (30), the sealing gasket (30) being arranged in the first mounting groove (21), the outer diameter of the sealing gasket (30) being D1, the inner diameter of the first mounting groove (21) being D2, |D1-D2|≤0.04 mm, the sealing gasket (30) having a valve port (31), the valve port (31) being in communication with the accommodating cavity (11); The flow regulating valve further comprises a valve head (40), the valve head (40) being movably disposed in the accommodating cavity (11) to block or open the valve port (31), and a gap b is provided between an outer side wall of the valve head (40) and an inner side wall of the accommodating cavity (11), wherein 0.01 mm ≤ b ≤ 0.04 mm; The flow regulating valve further comprises a valve needle structure (50) and a nut (60), wherein the valve needle structure (50) comprises a screw (51), the valve head (40) is sleeved on one end of the screw (51), the screw (51) is passed through the nut (60), the nut (60) has an assembly hole (61), and a gap c is provided between the outer side wall of the screw (51) and the inner side wall of the assembly hole (61), 0.01 mm ≤ c ≤ 0.04 mm; The main valve seat (10) includes a main valve body (12) and a limiting section (13) connected to each other, the cavities of the main valve body (12) and the limiting section (13) together constitute the accommodating chamber (11), the nut (60) has a first cylinder (62) and a second cylinder (63) connected to each other, the radial dimension of the second cylinder (63) is larger than the radial dimension of the first cylinder (62), the assembly hole (61) is located in the first cylinder (62), the second cylinder (63) is sleeved on the limiting section (13), the inner diameter of the second cylinder (63) is D3, the outer diameter of the limiting section (13) is D4, |D3-D4|≤0.04mm; The flow regulating valve further comprises a valve cylinder (90), one end of which is connected to the main valve seat (10).

2. The flow control valve according to claim 1, characterized in that: The accommodating cavity (11) includes a limiting hole section (111), a guide hole section (112) and a valve cavity (113) which are connected in sequence. The cavity of the limiting section (13) forms the limiting hole section (111). The guide hole section (112) and the valve cavity (113) are located in the main valve body (12). The outer wall of the valve head (40) is limitedly matched with the inner wall of the guide hole section (112). The valve port (31) and the valve cavity (113) are connected. The main valve seat (10) is an integrally formed structure.

3. The flow control valve according to claim 2, characterized in that: The screw rod (51) includes a first rod segment (511), a second rod segment (512) and a third rod segment (513) which are connected in sequence and whose radial dimensions increase in sequence. The outer wall of the third rod segment (513) is limitedly matched with the inner wall of the limiting hole segment (111); the valve needle structure (50) also includes a bushing (52), a bearing (53) and a pressing sleeve (54). The bushing (52) is sleeved on the first rod segment (511) and fixedly connected to the first rod segment (511); the bearing (53) is sleeved on the second rod segment (512), and the two ends of the inner ring of the bearing (53) are respectively in contact with the end face of the third rod segment (513) and the end face of the bushing (52); the pressing sleeve (54) is fixedly connected to the cavity of the valve head (40), and one end of the pressing sleeve (54) is in contact with the end face of the bearing (53) facing the third rod segment (513).

4. The flow control valve according to claim 1, characterized in that: The screw (51) has a first balancing hole (514), the valve head (40) has a second balancing hole (41), and the nut (60) has a third balancing hole. The first balancing hole (514) is communicated with the second balancing hole (41) and the third balancing hole, respectively. The second balancing hole (41) is communicated with the accommodating chamber (11).

5. The flow control valve according to claim 4, characterized in that: The flow areas of the first balancing hole (514), the second balancing hole (41), and the third balancing hole are all S1. The accommodating cavity (11) includes a limiting hole section (111). The outer wall of the screw (51) is limitedly matched with the inner wall of the limiting hole section (111). The flow area of ​​the area between the outer wall of the screw (51) and the inner wall of the limiting hole section (111) is S2, and S2 ≥ S1.

6. The flow control valve according to claim 1, characterized in that: The valve head (40) includes a guide head (42), a rod body (43) and a sealing head (44) connected in sequence. The radial size of the rod body (43) is smaller than the radial size of the guide head (42) and the sealing head (44). The outer wall of the guide head (42) is gap-matched with the inner wall of the accommodating cavity (11). The sealing head (44) is used to seal the valve port (31). The outer wall of the guide head (42) has an annular groove (45). The flow regulating valve also has an annular sealing ring (70). The annular sealing ring (70) is arranged in the annular groove (45). The outer ring of the annular sealing ring (70) is sealingly matched with the inner wall of the accommodating cavity (11).

7. The flow control valve according to claim 1, characterized in that: The side wall of the main valve seat (10) is provided with a flow hole (14), and the flow hole (14) is communicated with the accommodating chamber (11). The auxiliary valve seat (20) also has a second mounting groove (22), and the second mounting groove (22) is communicated with the valve port (31). The flow regulating valve also includes a first connecting pipe (81) and a second connecting pipe (82), one end of the first connecting pipe (81) is inserted into the flow hole (14), and the other end of the second connecting pipe (82) is inserted into the second mounting groove (22).

8. The flow control valve according to claim 6, characterized in that: The auxiliary valve seat (20) includes an auxiliary valve body (23) connected to each other and an annular boss (24) arranged on the auxiliary valve body (23). The auxiliary valve seat (20) also has a flange structure (25). The flange structure (25) is connected to the annular boss (24). The flange structure (25) is an annular structure. The flange structure (25) and the sealing gasket (30) are limited and matched.

9. A manufacturing method for manufacturing the flow control valve according to any one of claims 1 to 8, characterized in that: The manufacturing method comprises: S10: Connect the first connecting pipe (81) and the main valve seat (10); S20: Connecting the valve needle structure (50) and the valve head (40); S30: inserting the structure assembled in S20 into the main valve seat (10), wherein the guide section of the valve head (40) is installed in the wire hole section of the main valve seat (10); S40: Screw the nut (60) onto the screw (51) of the valve needle structure (50); S50: press-fitting the nut (60) onto the main valve seat (10) and welding the nut to the main valve seat (10); S60: Connect the second connecting pipe (82) and the auxiliary valve seat (20); S70: Connecting the auxiliary valve seat (20) and the main valve seat (10).

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