Valve needle assembly and valve device

Abstract

A valve needle assembly and a valve device, which relate to the field of thermal management systems. The valve needle assembly comprises a valve head component, a small valve needle, a valve port portion, a valve port seat and a connecting portion, wherein the valve head component is provided with an accommodating hole; the valve port portion and part of the valve port seat are located in the accommodating hole; correspondingly, part of the valve port seat is located outside the accommodating hole; the connecting portion is limited and connected to at least one of an outer peripheral wall and an outer end wall of the valve head component; the connecting portion is limited and connected to at least one of an outer peripheral wall and an outer end wall of the valve port seat; and the connecting portion can be limited and connected to an outer wall of the valve head component and an outer wall of the valve port seat, so as to make it convenient to assemble the valve needle assembly and the valve device.

Description

Valve needle assembly and valve device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 27, 2023, with application number 2023118205734 and invention name “Valve Needle Assembly and Valve Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of thermal management technology, and in particular to a valve needle assembly and a valve device. Background Art

[0003] The valve device used in the thermal management system includes a small valve needle and a valve head component. The valve head component includes a valve head, a sealing ring and a valve cover. The small valve port is formed on the sealing ring. The sealing ring and the small valve needle cooperate to form a soft sealing structure. The valve head has a mounting hole. The sealing ring and the valve cover are located in the mounting hole. The valve cover needs to be fixedly connected to the inner wall of the mounting hole. This makes the valve device inconvenient to assemble. Summary of the Invention

[0004] An object of the present invention is to provide a valve needle assembly which has the advantage of being easy to assemble.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a valve needle assembly, including a valve head component, a small valve needle, a valve mouth portion, a valve mouth seat and a connecting portion, the valve mouth portion having a small valve mouth that cooperates with the small valve needle, the valve mouth seat being far away from the small valve needle relative to the valve mouth portion, the valve head component having a accommodating hole, the valve mouth portion and part of the valve mouth seat being located in the accommodating hole, the valve mouth portion being limited to the valve mouth seat and the inner wall forming the accommodating hole, the connecting portion being limitedly connected to at least one of the outer peripheral wall of the valve head component and the outer end wall of the valve head component, the outer end wall of the valve head component being located on the peripheral side of the accommodating hole, and the connecting portion being limitedly connected to at least one of the outer peripheral wall of the valve mouth seat and the outer end wall of the valve mouth seat.

[0007] On the other hand, the present invention provides a valve device, including the above-mentioned valve needle assembly, the valve device also including a valve body, the valve body having a large valve port that cooperates with the valve head component, the valve head component and the small valve needle are respectively slidably connected to the valve body.

[0008] In a valve needle assembly provided in an embodiment of the present application, it includes a valve head component, a small valve needle, a valve mouth portion, a valve mouth seat and a connecting portion. The valve mouth component has a accommodating hole, the valve mouth portion and part of the valve mouth seat are located in the accommodating hole, and correspondingly, part of the valve mouth seat is located outside the accommodating hole. The connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component, and the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve mouth seat. The connecting portion can be limitedly connected to the outer wall of the valve head component and the outer wall of the valve mouth seat, thereby facilitating the assembly of the valve needle assembly.

[0009] A valve device provided in an embodiment of the present application includes a valve head component, a small valve needle, a valve mouth portion, a valve mouth seat, a connecting portion and a valve body, the valve head component and the small valve needle are respectively slidably connected to the valve body, the valve mouth component has a accommodating hole, the valve mouth portion and part of the valve mouth seat are located in the accommodating hole, and correspondingly, part of the valve mouth seat is located outside the accommodating hole, the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component, the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve mouth seat, and the connecting portion can be limitedly connected to the outer wall of the valve head component and the outer wall of the valve mouth seat, thereby facilitating the assembly of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of the three-dimensional structure of a valve according to Example 1 of the present invention;

[0011] FIG2 is a schematic cross-sectional view of the structure of FIG1 ;

[0012] FIG3 is a partial enlarged view of the structure at “A” in FIG2 ;

[0013] FIG4 is a schematic cross-sectional view of the valve head component in FIG2 ;

[0014] FIG5 is a schematic cross-sectional view of the valve port portion in FIG2 ;

[0015] FIG6 is a schematic cross-sectional view of the valve seat in FIG2 ;

[0016] FIG7 is a schematic diagram of the three-dimensional structure of a valve needle assembly provided in Example 2 of the present invention;

[0017] FIG8 is a schematic cross-sectional view of the structure of FIG7;

[0018] FIG9 is a schematic diagram of a partially enlarged structure of the portion “B” in FIG8 ;

[0019] FIG10 is a schematic cross-sectional view of the valve head component in FIG8;

[0020] FIG11 is a schematic diagram of the three-dimensional structure of a valve needle assembly provided in Example 3 of the present invention;

[0021] FIG12 is a schematic cross-sectional view of the structure of FIG11;

[0022] FIG13 is a schematic diagram of a partial enlarged structure of the portion “C” in FIG12 ;

[0023] FIG14 is a schematic cross-sectional view of the valve seat in FIG12;

[0024] FIG15 is a schematic diagram of the three-dimensional structure of a valve needle assembly provided in Example 4 of the present invention;

[0025] FIG16 is a schematic cross-sectional view of the valve needle assembly shown in FIG15 before stamping;

[0026] FIG17 is a schematic diagram of a partial enlarged structure of the portion “D” in FIG16 ;

[0027] FIG18 is a partial enlarged structural schematic diagram of the valve needle assembly shown in FIG17 after stamping;

[0028] FIG19 is a schematic cross-sectional view of the valve head component in FIG16;

[0029] FIG20 is a schematic diagram of the three-dimensional structure of a valve needle assembly provided in Example 5 of the present invention;

[0030] FIG21 is a schematic cross-sectional view of the valve needle assembly shown in FIG20 before stamping;

[0031] FIG22 is a partial enlarged structural diagram of the portion “E” in FIG21 ;

[0032] FIG23 is a partial enlarged structural schematic diagram of the valve needle assembly shown in FIG22 after stamping;

[0033] FIG24 is a schematic cross-sectional view of the valve head component in FIG21;

[0034] FIG25 is a schematic diagram of the three-dimensional structure of a valve needle assembly provided in Example 6 of the present invention;

[0035] FIG26 is a schematic cross-sectional view of the valve needle assembly shown in FIG25;

[0036] FIG27 is a partial enlarged structural diagram of the portion “F” in FIG26 ;

[0037] FIG28 is a schematic cross-sectional view of the valve head component in FIG25;

[0038] FIG29 is a schematic structural diagram of the clamping portion in FIG25;

[0039] 100. Valve device; 200. Valve needle assembly; 1. Valve head component; 2. Valve port; 3. Valve port seat; 4. Valve body; 5. Welding portion; 6. Pressing portion; 7. Clamping portion; 8. Small valve needle; 51. Fillet weld; 52. First flat weld; 53. Second flat weld; 11. Receiving hole; 12. First medium hole; 13. First outer end wall; 14. First inner circumferential wall; 15. First bottom wall; 16. Third shaft section; 17. Shaft cavity; 18. First outer circumferential wall; 19. Conical inner circumferential wall; 20. Top wall; 111. Third straight hole section; 112. Fourth straight hole section; 113. First straight hole section; 114. Second straight hole section; 21. Small valve 22. Fourth inner circumferential wall; 23. First end wall; 24. Second end wall; 25. Anti-mumbling portion; 31. First diameter section; 32. Second diameter section; 33. First inner end wall; 34. Second outer end wall; 35. Second outer circumferential wall; 36. Step wall; 37. Avoidance hole; 41. Second medium hole; 42. Mounting hole; 43. Flow channel hole; 44. Large valve port; 61. Base section; 62. Bending section; 71. Cantilever beam; 81. Conical head; 82. First shaft section; 83. Second shaft section; 321. Third outer end wall; 322. Third outer circumferential wall; 1111. Third inner circumferential wall; 1141. Second inner circumferential wall; 1142. Second bottom wall. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0041] In the current technology, the valve device used in the thermal management system includes a valve body and a valve needle assembly, the valve body includes a large valve port, the valve needle assembly includes a valve head component, the valve head component is slidably connected to the valve body, and the opening of the large valve port can be controlled by sliding the valve head component, the valve head component includes a small valve port, the valve needle assembly also includes a small valve needle, the small valve needle is slidably connected to the valve head component, and the opening of the small valve port can be controlled by sliding the small valve needle, the valve head component and the small valve needle are both made of metal material, and a hard sealing structure is formed between the small valve port and the small valve needle, but the roundness of the small valve needle and at least one of the small valve port is likely to fail to meet the design requirements, and the small valve needle cannot fully contact the inner wall of the small valve port, thereby reducing the sealing performance of the small valve needle and the small valve port.

[0042] Furthermore, as described above, in order to improve the sealing performance of the small valve needle and the small valve port, the valve head component includes a valve head, a sealing ring and a valve cover. The small valve port is formed in the sealing ring. The valve head has a mounting hole. The sealing ring and the valve cover are located in the mounting hole. The valve cover is used to limit the sealing ring in the axial direction of the mounting hole. The valve cover is fixedly connected to the inner wall forming the mounting hole. The connection structure between the valve cover and the valve head has the problem of being inconvenient to assemble.

[0043] Furthermore, the inner diameters of the large and small valve orifices need to be very small to facilitate precise flow control. For example, in automotive air conditioning and thermal management systems, the valves used as refrigerant valves have an inner diameter of only 10mm for the large orifice and 2.5mm for the small orifice. Accordingly, the outer diameters of the valve head and the small valve needle are controlled to be around 10mm and 2.5mm, respectively. Using conventional techniques, achieving a fixed connection between a valve head and a valve cover with such a small outer diameter is extremely difficult, if not impossible.

[0044] Based on the problems of current technology, an embodiment of the present application provides a valve needle assembly 200, including a valve head component 1, a small valve needle 8, a valve mouth portion 2, a valve mouth seat 3 and a connecting portion (5, 6), the valve mouth portion 2 having a small valve mouth 21 cooperating with the small valve needle 8, the valve mouth seat 3 being away from the small valve needle 8 relative to the valve mouth portion 2, the valve head component 1 having a accommodating hole 11, the valve mouth portion 2 and part of the valve mouth seat 3 being located in the accommodating hole 11, the valve mouth portion 2 being limited to the valve mouth seat 3 and the inner wall forming the accommodating hole 11, the connecting portion being limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component 1, the outer end wall of the valve head component 1 being located on the peripheral side of the accommodating hole 11, the connecting portion being limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve mouth seat 3, the connecting portion being limitedly connected to the outer wall of the valve head component 1 and the outer wall of the valve mouth seat 3, so as to facilitate the assembly of the valve needle assembly.

[0045] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0046] The following is a detailed description of a valve needle assembly provided in an embodiment of the present application, in conjunction with Figures 1 to 29. The valve needle assembly is a part of a valve device 100, and includes a valve head component 1, a small valve needle 8, a valve mouth portion 2, a valve mouth seat 3, and a connecting portion. The valve mouth portion 2 has a small valve mouth 21 that cooperates with the small valve needle 8, and the valve mouth seat 3 is away from the small valve needle 8 relative to the valve mouth portion 2. The valve head component 1 has a receiving hole 11, and the valve mouth portion 2 is located in the receiving hole 11. The connecting portion is limited to connect the valve head component 1 and the valve mouth seat 3, and the valve mouth portion 2 is limited to the valve mouth seat 3 and the inner wall forming the receiving hole 11. Specifically, the connecting portion is limited to at least one of the outer wall of the valve head component 1 and the outer wall of the valve mouth seat 3.

[0047] In one possible implementation, as shown in Figures 3, 9, 13, 17 and 22, the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component 1, the outer end wall of the valve head component 1 is located on the peripheral side of the accommodating hole 11, and the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat 3, which is equivalent to the connecting portion being limitedly connected to the outer wall of the valve head component 1 and the outer wall of the valve port seat 3, thereby facilitating the assembly of the valve needle assembly.

[0048] Furthermore, as shown in Figures 3, 9, 13, 17, and 22, a portion of the valve seat 3 is located within the accommodating hole 11, thereby improving the connection stability between the valve seat 3 and the valve head component 1. Accordingly, a portion of the valve seat 3 is exposed outside the accommodating hole 11. In other words, a portion of the outer peripheral wall of the valve seat 3 is exposed outside the accommodating hole 11, and the outer end wall of the valve seat 3 is exposed outside the accommodating hole 11, so that the connecting portion can limit the connection between at least one of the outer peripheral wall and the outer end wall of the valve seat 3.

[0049] Furthermore, the receiving hole 11 is formed in the outer end wall of the valve head component 1, the outer peripheral wall of the valve head component 1 is exposed outside the receiving hole 11, and the outer end wall of the valve head component 1 is exposed outside the receiving hole 11, so that the connecting portion is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component 1. Specifically, the valve head component 1 is a shaft-like component, the outer peripheral wall of the valve head component 1 is the first outer peripheral wall 18, the outer end wall of the valve head component 1 is the first outer end wall 13, the receiving hole 11 is formed in the first outer end wall 13, and the connecting portion is limitedly connected to at least one of the first peripheral wall 18 and the first outer end wall 13.

[0050] Furthermore, the valve port portion 2 is made of an elastic material, including but not limited to plastic, to facilitate forming a soft seal between the inner wall of the small valve port 21 and the small valve needle 8. The valve port seat 3 is made of a metal material, including but not limited to at least one of aluminum alloy, carbon steel, and stainless steel, exhibiting high mechanical strength and corrosion resistance. Specifically, as shown in Figure 2, the inner wall forming the small valve port 21 includes a fourth inner circumferential wall 22, with at least a portion of the outer circumferential wall of the small valve needle 8 contacting the fourth inner circumferential wall 22.

[0051] Furthermore, the small valve needle 8 can be slidably arranged relative to the valve head component 1. When the small valve needle 8 slides relative to the valve head component 1, the small valve needle 8 can open or close the small valve port 21, thereby controlling the opening of the small valve port 21.

[0052] Specifically, as shown in Figures 2 and 3, the small valve needle 8 includes a first shaft segment 82, and the accommodating hole 11 has a fourth straight hole segment 112. At least a portion of the first shaft segment 82 is located within the fourth straight hole segment 112. The first shaft segment 82 and the fourth straight hole segment 112 are adapted to each other, allowing the small valve needle 8 to slide axially along the fourth straight hole segment 112. Furthermore, during the process of the small valve needle 8 opening or closing the small valve port 21, at least a portion of the first shaft segment 82 remains within the fourth straight hole segment 112, thereby preventing leakage of the medium through the fourth straight hole segment 112.

[0053] Specifically, as shown in Figure 2, the small valve needle 8 also includes a second shaft segment 83, and the second shaft segment 83 is far away from the valve mouth portion 2 relative to the first shaft segment 82. The valve head component 1 also has an shaft cavity 17, and the shaft cavity 17 is far away from the valve mouth portion 2 relative to the fourth straight hole segment 112. The second shaft segment 83 is located in the shaft cavity 17, and the second shaft segment 83 slides along the axial direction of the shaft cavity 17. The second shaft segment 83 is limited between the inner walls on both sides of the shaft cavity 17, thereby limiting the sliding stroke of the small valve needle 8 relative to the valve head component 1.

[0054] Furthermore, as shown in FIG2 , the small valve needle 8 includes a tapered head 81 formed at one end of the small valve needle 8. When the small valve needle 8 closes the small valve opening 21, at least a portion of the tapered head 81 is located within the small valve opening 21. The outer wall of the tapered head 81 can fully contact the inner wall of the small valve opening 21. The tapered head 81 and the inner wall of the small valve opening 21 form a soft sealing structure, thereby improving the sealing effect of the tapered head 81 and the small valve opening 21.

[0055] Furthermore, as shown in Figures 2 and 3, the valve head component 1 also has a first medium hole 12, which is connected to the accommodating hole 11. In actual use, when the small valve needle 8 opens the small valve port 21, the first medium hole 12, the accommodating hole 11, and the small valve port 21 are connected, forming a pipeline for the flow of medium. The medium can flow through the first medium hole 12, the accommodating hole 11, and the small valve port 21 in sequence. The accommodating hole 11 is vertically opened in the valve head component 1, and the first medium hole 12 is horizontally opened in the valve head component 1. There are at least two first medium holes 12, and the at least two first medium holes 12 are arranged circumferentially and evenly located on the inner peripheral wall forming the accommodating hole 11. In actual use, the medium can flow into the accommodating hole 11 evenly from the circumference of the accommodating hole 11, thereby improving the flow smoothness of the medium into the accommodating hole 11.

[0056] Furthermore, the inner diameter of the small valve opening 21 is small, so as to adjust the medium flow more precisely. For example, the valve needle assembly is a part of an air conditioning refrigerant valve, and the small valve opening 21 is 2.5 mm.

[0057] Furthermore, as shown in Figures 3 and 6 , the valve seat 3 is roughly shaped like a shaft and has a relief hole 37 extending through the valve seat 3 and communicating with the small valve port 21, preventing the valve seat 3 from obstructing the flow of the medium. In actual use, the medium can flow through the first medium port 12, the fourth straight hole section 112, the small valve port 21, and the relief hole 37.

[0058] In a possible implementation, the accommodating hole 11 has a first straight hole section 113 , the valve port portion 2 is located in the first straight hole section 113 , the valve port seat 3 includes a first diameter section 31 , and at least part of the first diameter section 31 is located in the first straight hole section 113 .

[0059] Further, as shown in Figures 12 and 13, Figures 17 and 18, the valve mouth seat 3 is shaped like a straight axis and consists of a first diameter section 31. The outer peripheral wall of the valve mouth seat 3 includes the outer peripheral wall of the first diameter section 31, and the outer peripheral wall of the first diameter section 31 is the second outer peripheral wall 35. Part of the second outer peripheral wall 35 is exposed outside the accommodating hole 11. The outer end wall of the valve mouth seat 3 is the outer end wall of the first diameter section 31, and the outer end wall of the first diameter section 31 is the second outer end wall 34. The second outer end wall 34 is exposed outside the accommodating hole 11, so that the connecting part is limitedly connected to at least one of the second peripheral wall 35 and the second outer end wall 34.

[0060] The first diameter section 31 and the first straight hole section 113 can be configured with any of a clearance fit, a transition fit, and an interference fit. In one possible implementation, the outer diameter of the first diameter section 31 is smaller than the inner diameter of the first straight hole section 113, and at least a portion of the outer peripheral wall of the first diameter section 31 is spaced apart from the inner wall of the first straight hole section 113 to facilitate assembly of the first diameter section 31 within the first straight hole section 113. The outer peripheral wall of the first diameter section 31 is a second peripheral wall 35, and the inner wall of the first straight hole section 113 includes the first inner peripheral wall 14. At least a portion of the second peripheral wall 35 is spaced apart from the first inner peripheral wall 14.

[0061] Furthermore, as shown in Figures 12 and 13, a portion of the connecting portion is positionally connected to the outer peripheral wall of the first diameter section 31 and the inner wall forming the first straight hole section 113, thereby improving the stability of the connection between the valve head component 1 and the valve seat 3. Specifically, a gap is left between the second outer peripheral wall 35 and the first inner peripheral wall 14. When the connecting portion is positionally connected to the second peripheral wall 35 and the first outer end wall 13, a portion of the connecting portion can be formed in this gap. Specifically, the difference between the inner diameter of the first straight hole section 113 and the outer diameter of the first diameter section 31 is less than 2 mm, which prevents the connection from breaking.

[0062] In one possible implementation, the valve seat 3 is shaped roughly like a hollow stepped shaft and further includes a second diameter section 32. The outer diameter of the second diameter section 32 is greater than the outer diameter of the first diameter section 31. The second diameter section 32 is further away from the valve port 2 than the first diameter section 31. The outer wall of the second diameter section 32 includes a stepped wall 36 that extends from the outer circumferential wall of the first diameter section 31 to the outer circumferential wall of the second diameter section 32. When the connecting portion is positionally connected to the valve seat 3, it may be considered to positionally connect the connecting portion to the outer circumferential wall and outer end wall of the second diameter section 32. The outer diameter of the second diameter section 32 is greater than the outer diameter of the first diameter section 31, thereby facilitating assembly of the connecting portion and the valve seat 3.

[0063] Further, as shown in Figures 3, 6, 9 and 23, the outer peripheral wall of the valve mouth seat 3 includes the outer peripheral wall of the second diameter section 32, the outer peripheral wall of the second diameter section 32 is the third outer peripheral wall 322, at least part of the third outer peripheral wall 322 is exposed outside the accommodating hole 11, the outer end wall of the valve mouth seat 3 includes the outer end wall of the second diameter section 32, the outer end wall of the second diameter section 32 is the third outer end wall 321, the third outer end wall 321 is exposed outside the accommodating hole 11, and the connecting portion is limitedly connected to at least one of the third peripheral wall 322 and the third outer end wall 321.

[0064] In one possible implementation, the outer diameter of the second diameter section 32 is greater than the inner diameter of the first straight hole section 113 , and at least a portion of the step wall 36 is spaced apart from the outer end wall of the valve head component 1 to prevent wear between the second diameter section 32 and the valve head component 1 due to contact. Specifically, the second diameter section 32 is not located within the first straight hole section 113 and is exposed outside the receiving hole 11 .

[0065] Furthermore, as shown in Figure 3, the second diameter section 32 is positioned outside the receiving hole 11, with a portion of the connecting portion being positionally connected to the step wall 36 and the first outer end wall 13. This improves the stability of the connection between the valve head component 1 and the valve seat 3. Specifically, a gap is left between the step wall 36 and the first outer end wall 13. When the connecting portion is positionally connected to the third outer peripheral wall 322 and the first outer end wall 13, a portion of the connecting portion can penetrate this gap. Specifically, the gap between the step wall 36 and the first outer end wall 13 is less than 2 mm, preventing the connection from breaking.

[0066] Furthermore, the sum of the axial lengths of the valve mouth portion 2 and the first diameter section 31 is greater than the axial length of the first straight hole section 113 , so that a gap is retained between the step wall 36 and the first outer end wall 13 after the valve needle assembly is assembled.

[0067] The second diameter section 32 and the second straight hole section 114 can be any one of a clearance fit, a transition fit, and an interference fit. In one possible implementation, as shown in Figures 9, 10, 23, and 24, the receiving hole 11 has a second straight hole section 114, the inner diameter of which is greater than the outer diameter of the second diameter section 32, and a portion of the second diameter section 32 is located in the second straight hole section 114, further improving the connection stability between the valve seat 3 and the valve head component 1. Specifically, the inner wall forming the second straight hole section 114 includes a second inner peripheral wall 1141, and at least a portion of the third outer peripheral wall 322 is provided with a gap relative to the second inner peripheral wall 1141, thereby facilitating the assembly of the second straight hole section 114 and the second diameter section 32. Specifically, the inner wall forming the second straight hole section 114 also includes a second bottom wall 1142, which extends from the first inner peripheral wall 14 to the second inner peripheral wall 1141. At least part of the step wall 36 is set in a gap relative to the second bottom wall 1142 to avoid wear between the valve mouth seat 3 and the valve head component 1 due to contact.

[0068] Furthermore, as shown in FIG9 , a portion of the second diameter section 32 is exposed outside the receiving hole 11, and a portion of the connecting portion is positionally connected to the third outer peripheral wall 322 and the second inner peripheral wall 1141. A gap is left between the third peripheral wall 322 and the second inner peripheral wall 1141. When the connecting portion is positionally connected to the first outer end wall 13 and the third peripheral wall 322, a portion of the connecting portion penetrates the gap and is further positionally connected to the third peripheral wall 322 and the second inner peripheral wall 1141. Specifically, the difference between the inner diameter of the second straight hole section 114 and the outer diameter of the second diameter section 32 is less than 2 mm, thereby preventing the connection from breaking.

[0069] Furthermore, the sum of the axial lengths of the first diameter section 31 and the second diameter section 32 is greater than the sum of the axial lengths of the first straight hole section 113 and the second straight hole section 114, so that a gap is retained between the step wall 36 and the second bottom wall 1142 after the valve needle assembly is assembled.

[0070] Furthermore, as shown in FIG4 , the accommodating hole 11 is shaped like a stepped hole and further includes a third straight hole section 111. The third straight hole section 111 is further away from the second straight hole section 114 relative to the first straight hole section 113, and the fourth straight hole section 112 is further away from the first straight hole section 113 relative to the third straight hole section 111. The first medium hole 12 is located on the inner wall forming the third straight hole section 111. As shown in FIG10 and FIG24 , the fourth straight hole section 112, the third straight hole section 111, the first straight hole section 113, and the second straight hole section 114 are arranged in sequence from top to bottom. The inner diameter of the fourth straight hole section 112 is smaller than the inner diameter of the third straight hole section 111, smaller than the inner diameter of the first straight hole section 113, smaller than the inner diameter of the second straight hole section 114, so as to facilitate assembly of the valve head component 1 with the small valve needle 8, the valve port portion 2, and the valve port seat 3. Specifically, the inner wall forming the third straight hole section 111 includes a third inner peripheral wall 1111 , and the first medium hole 12 is formed in the third inner peripheral wall 1111 .

[0071] In one possible implementation, as shown in Figure 5, the outer wall of the valve mouth portion 2 includes a first end wall 23 and a second end wall 24, and the inner wall forming the accommodating hole 11 includes a first bottom wall 15. At least part of the first end wall 23 contacts the first bottom wall 15, and at least part of the second end wall 24 contacts the inner end wall of the valve mouth seat 3. The valve mouth seat 3 limits the valve mouth portion 2 in the axial direction of the accommodating hole 11, thereby improving the anti-internal leakage performance of the valve needle assembly.

[0072] Furthermore, the first end wall 23 and the second end wall 24 are located at either end of the valve port portion 2. The inner wall forming the first straight hole section 113 includes a first bottom wall 15, which is located around the third straight hole section 111, thereby improving the valve needle assembly's internal leakage prevention performance. The inner and outer end walls of the valve seat 3 are located at either end of the valve seat 3, respectively. The inner end wall of the valve seat 3 is located within the accommodating hole 11. The inner end wall of the valve seat 3 forms the inner end wall of the first diameter section 31, which in turn forms the first inner end wall 33.

[0073] Furthermore, as shown in Figure 5, the valve mouth portion 2 includes an anti-foolproof portion 25, which is formed on the first end wall 23 or the second end wall 24. The anti-foolproof portion 25 is designed to intuitively distinguish the first end wall 23 and the second end wall 24, thereby avoiding the problem of incorrect assembly of the valve mouth portion 2 relative to the accommodating hole 11 and ensuring that the first end wall 23 and the first bottom wall 15 can be in contact with each other.

[0074] Furthermore, the foolproof portion 25 includes, but is not limited to, at least one of a groove, a protrusion, a hole, and a mark, and only needs to satisfy the requirement that the user can intuitively perceive the foolproof portion 25. As shown in Figure 5, the foolproof portion 25 is a groove formed in the second end wall 24. During the process of manufacturing the valve mouth portion 2 using an injection molding process, the foolproof portion 25 is directly formed as a groove on the second end wall 24.

[0075] Furthermore, at least a portion of the outer wall of the valve opening 2 contacts the inner wall forming the first straight hole section 113, further improving the valve needle assembly's internal leakage resistance. Specifically, the outer wall of the valve opening 2 includes the outer peripheral wall of the valve opening 2, and the inner wall forming the first straight hole section 113 includes the first inner peripheral wall 14. At least a portion of the outer peripheral wall of the valve opening 2 contacts the first inner peripheral wall 14. The inner wall forming the first straight hole section 113 also includes a first bottom wall 15, which extends from the inner peripheral wall of the third straight hole section 111 to the first inner peripheral wall 14. The outer wall of the valve opening 2 also includes a first end wall 23, and at least a portion of the first bottom wall 15 contacts the first end wall 23.

[0076] Furthermore, at least one surface of the first end wall 23 and the first bottom wall 15 has been polished to eliminate any imperfections, particles, or unevenness that may exist on at least one of the surfaces. This improves the smoothness and roughness, thereby enhancing the valve needle assembly's internal leakage resistance. Specifically, the surface roughness of the first end wall 23 and the surface roughness of the first bottom wall 15 reach Ra0.8 or higher, respectively.

[0077] Furthermore, the valve mouth portion 2 is in a compressed state, and the valve mouth portion 2 in the compressed state tends to return to its original state and thus exerts an elastic force on the valve head component 1. The elastic force exerted by the valve mouth portion 2 on the valve head component 1 makes the first end wall 23 and the first bottom wall 15 fit together more closely. The first end wall 23 and the first bottom wall 15 cooperate to form a tight soft sealing structure, thereby preventing the medium from leaking from between the first bottom wall 15 and the first end wall 23, thereby improving the anti-internal leakage performance of the valve needle assembly.

[0078] In a possible implementation, the connection portion includes at least one of a welding portion 5 and a crimping portion 6 .

[0079] In a possible implementation, as shown in Figures 3, 9 and 13, the connection portion includes a welded fusion portion 5, which is formed on the outer peripheral wall of the valve seat 3 and also on the outer end wall of the valve head component 1.

[0080] Furthermore, the weld 5 is formed between the valve seat 3 and the valve head component 1 by welding. The welding method includes, but is not limited to, at least one of laser welding, ultrasonic welding, soldering, gas welding, argon arc welding, and submerged arc welding. Specifically, the welding method is laser welding. During the welding process, a laser beam directly acts on the valve seat 3 and the valve head component 1, heating the surfaces of the valve seat 3 and the valve head component 1 to form a molten pool. After the molten pool cools and solidifies, the weld 5 is formed, thereby facilitating the welding of the miniaturized valve head component 1 and the valve seat 3.

[0081] Furthermore, as shown in Figures 3, 9, and 13, the weld portion 5 includes a fillet weld 51. When the valve seat 3 is composed of the first diameter section 31, the fillet weld 51 is formed between the second outer peripheral wall 35 and the first outer end wall 13. When the valve seat 3 is composed of the first diameter section 31 and the second diameter section 32, the fillet weld 51 is formed between the third outer peripheral wall 322 and the first outer end wall 13. Specifically, the fillet weld 51 is annular in shape, encircling the valve seat 3 and surrounding the accommodating hole 11, thereby improving the stability of the connection between the valve seat 3 and the valve head component 1.

[0082] Furthermore, as shown in Figure 3, the second diameter section 32 is located outside the receiving hole 11. The welded portion 5 also includes a first flat weld 52. The welded portion 5 is composed of a fillet weld 51 and the first flat weld 52. The first flat weld 52 is formed between the step wall 36 and the first outer end wall 13, thereby improving the stability of the connection between the valve seat 3 and the valve head component 1. The first flat weld 52 is also located around the receiving hole 11, sealing the gap between the step wall 36 and the first outer end wall 13, thereby improving the valve needle assembly's internal leakage prevention performance. During the welding process to form the fillet weld 51, the step wall 36 and the first outer end wall 13 are heated to form a molten pool, which cools and solidifies to form the first flat weld 52.

[0083] Furthermore, as shown in Figures 9 and 13, a portion of the second diameter section 32 is located within the receiving hole 11, and correspondingly, a portion of the second diameter section 32 is located outside the receiving hole 11. The weld portion 5 also includes a second flat weld 53. The weld portion 5 is composed of a fillet weld 51 and a second flat weld 53. The second flat weld 53 is formed on the third outer peripheral wall 322 and the second inner peripheral wall 1141, thereby improving the stability of the connection between the valve seat 3 and the valve head component 1. The second flat weld 53 is generally annular and is located on the inner wall forming the receiving hole 11. It seals the third outer peripheral wall 322 and the second inner peripheral wall 1141, thereby improving the anti-internal leakage performance of the valve needle assembly. During the welding process to form the fillet weld 51, the third outer peripheral wall 322 and the second inner peripheral wall 1141 are heated to form a molten pool. After the molten pool cools and solidifies, it forms the second flat weld 53.

[0084] In one possible implementation, as shown in Figures 17, 18, 22 and 23, the connecting portion includes a bent crimping portion 6, the crimping portion 6 and the valve head component 1 are an integrated structure, the crimping portion 6 is formed on the outer end wall of the valve head component 1, and the crimping portion 6 is also limitedly connected to the outer end wall of the valve port seat 3.

[0085] Furthermore, the crimping portion 6 is bent using a plastic working method. This method involves plastically deforming the crimping portion 6 under at least one external force, thereby limiting its connection to the outer end wall of the valve seat 3. Plastic working methods include, but are not limited to, at least one of forging, extrusion, drawing, stamping, and spinning. Specifically, the plastic working method is stamping, and a high-precision mold can be used to stamp the crimping portion 6, thereby causing the bend, thereby facilitating the processing of the miniaturized valve seat 3 and valve head component 1.

[0086] Furthermore, the crimping portion 6 can be divided into a base section 61 and a bent section 62 based on the position of its bend. The bent section 62 is bent relative to the base section 61. The bent section 62, the base section 61, and the valve head component 1 are an integral structure. The bent section 62 is positionally connected to the outer end wall of the valve seat 3. Specifically, the bent angle of the bent section 62 relative to the base section 61 is approximately 90°, so that the bent section 62 fully abuts the outer end wall of the valve seat 3.

[0087] Furthermore, the crimping portion 6 is plate-shaped to facilitate stamping of the crimping portion 6. Specifically, considering that part of the first crimping portion 6 is located on the outer peripheral wall of the valve seat 3, the crimping portion 6 is in the shape of an arc-shaped plate, thereby improving the connection stability between the first crimping portion 6 and the valve seat 3.

[0088] Furthermore, there are at least three crimping portions 6, which enclose a circular area. Part of the valve seat 3 is located within the circular area, thereby improving the connection stability between the valve seat 3 and the crimping portions 6. Specifically, at least three base segments 61 enclose the circular area, and at least three bent segments 62 are positionally connected to the outer end wall of the valve seat 3.

[0089] Furthermore, the valve port seat 3 is composed of a first diameter section 31 , and the crimping portion 6 is limitedly connected to the second outer end wall 34 , thereby limiting the valve port portion 2 in the axial direction of the accommodating hole 11 .

[0090] Furthermore, the valve seat 3 is composed of a first diameter section 31 and a second diameter section 32 , and the crimping portion 6 is limitedly connected to the third outer end wall 321 , thereby limiting the valve port portion 2 in the axial direction of the accommodating hole 11 .

[0091] In one possible implementation, the connecting portion includes both a welding portion 5 and a bending portion 6. The welding portion 5 is formed on the outer peripheral wall of the valve mouth seat 3 and the outer end wall of the valve head component 1. The crimping portion 6 and the valve head component 1 are an integrated structure. The crimping portion 6 is located on the outer end wall of the valve head component 1. The crimping portion 6 is also limitedly connected to the outer end wall of the valve mouth seat 3.

[0092] In one possible implementation, the outer peripheral wall of the valve head component 1 is consistent with the outer peripheral wall of the cone, the outer diameter of the end of the valve head component 1 close to the large valve port 44 is smaller, the welding portion 5 is located on the outer peripheral wall of the valve head component 1, and the welding portion 5 is located on the outer peripheral wall of the valve port seat 3. In this way, when the valve head component 1 contacts the inner wall forming the large valve port 44, the welding portion 5 may not contact the inner wall forming the large valve port 44, thereby reducing the influence of the welding portion 5 on the sealing of the valve needle assembly.

[0093] In one possible implementation, as shown in Figures 25 to 29, at least one of the connection methods between the connecting portion and the valve head component 1 and the connection method between the connecting portion and the valve seat 3 includes a snap-fit ​​connection, which simplifies the assembly of the connecting portion with the valve head component 1 and / or the valve seat 3, thereby facilitating assembly of the valve needle assembly. Specifically, the valve seat 3 is snap-fitted to the connecting portion; alternatively, the valve head component 1 is snap-fitted to the connecting portion; or alternatively, the connecting portion is snap-fitted to both the valve head component 1 and the valve seat 3.

[0094] Furthermore, the valve mouth seat 3 includes a clamping portion 7. As shown in Figure 27, the clamping portion 7 and the valve mouth seat 3 are an integrated structure. The clamping portion 7 is clamped and connected to the valve head component 1, which simplifies the structure and assembly operation of the connecting portion, the valve head component 1 and the valve mouth seat 3, thereby facilitating the assembly of the valve needle assembly.

[0095] Furthermore, the clamping portion 7 and the accommodating hole 11 form a clamping structure, at least part of the clamping portion 7 is located in the accommodating hole 11, and at least part of the outer wall of the clamping portion 7 contacts the inner wall 11 forming the accommodating hole 11, thereby improving the compactness of the structure.

[0096] Furthermore, the inner wall forming the accommodating hole 11 includes a top wall 20, which is formed on the inner peripheral wall of the accommodating hole 11. The top wall 20 is away from the valve mouth seat 3 relative to the clamping portion 7, and at least part of the outer wall of the clamping portion 7 contacts the top wall 20, so that the clamping portion 7 limits the valve mouth seat 3 in the axial direction of the accommodating hole 11.

[0097] Furthermore, the top wall 20 is annular in shape, thereby enhancing the limiting effect of the top wall 20 on the clamping portion 7. Specifically, the opening of the accommodating hole 11 is located inside the annular top wall 20, and at least a portion of the valve port portion 2 and at least a portion of the valve port seat 3 are located axially with respect to the opening of the accommodating hole 11, so that the valve port portion 2 and the valve port seat 3 can be assembled into the accommodating hole 11 through the opening of the accommodating hole 11.

[0098] Furthermore, the inner circumferential wall of the accommodating hole 11 includes a tapered inner circumferential wall 19, and a top wall 20 is formed on the tapered inner circumferential wall 19. The tapered inner circumferential wall 19 serves as a relief, and at least a portion of the clamping portion 7 is located on the inner side of the tapered inner circumferential wall 19, allowing at least a portion of the clamping portion 7 to tilt relative to the tapered inner circumferential wall 19, thereby facilitating the assembly of the valve port 2, the valve port seat 3, and the clamping portion 7 into the accommodating hole 11. Specifically, the inner circumferential wall of the accommodating hole 11 also includes a first inner circumferential wall 14, the valve port 2 is located on the inner side of the first inner circumferential wall 14, and a portion of the valve port seat 3 is located on the first inner circumferential wall 14. The first inner circumferential wall 14 is formed at the end of the tapered inner circumferential wall 19 with a smaller inner diameter, and the top wall 20 is formed at the end of the tapered inner circumferential wall 14 with a larger inner diameter, thereby allowing the valve port 2, the valve port seat 3, and the clamping portion 7 to retreat toward the top wall 20 by a certain distance.

[0099] Furthermore, the clamping portion 7 is a cantilever beam 71, and the cantilever beam 71 can be deformed along the radial direction of the valve seat 3, and at least part of the cantilever beam 71 contacts the top wall 20. When the cantilever beam 71 is deformed by force, at least part of the clamping portion 7 is away from the valve head component 1 or close to the valve head component 1. When at least part of the clamping portion 7 is away from the valve head component 1, it plays a role of avoiding position, so as to facilitate the assembly of the clamping portion 7, the valve seat 3 and the valve head component 1. When at least part of the clamping portion 7 is close to the valve head component 1, the clamping portion 7 and the valve head component 1 are tightly connected, thereby improving the stability of the connection. Specifically, the cantilever beam 71 is made of an elastic metal material, and the elastic metal material includes but is not limited to at least one of aluminum alloy, carbon steel and stainless steel.

[0100] Furthermore, the cantilever beam 71 is formed on the outer peripheral wall of the valve seat 3 , and the cantilever beam 71 and the valve head component 1 can be fully engaged, thereby improving the connection stability between the engaging portion 7 and the valve head component 1 .

[0101] Furthermore, there are at least two cantilever beams 71 , and the at least two cantilever beams 71 enclose a circular area. The at least two cantilever beams 71 can abut against the top wall 20 , thereby improving the connection stability between the clamping portion 7 and the valve head component 1 .

[0102] Furthermore, adjacent cantilever beams 71 are provided with gaps, and the gaps between adjacent cantilever beams 71 avoid interference with each other, thereby facilitating the assembly of at least two cantilever beams 71 and the valve head component 1 .

[0103] Furthermore, the cantilever beam 71 and the valve seat 3 of the integral structure are thin-walled parts, which are made by a stamping process. In this stamping process, the cantilever beam 71 and the valve seat 3 of the integral structure can be obtained by cutting and stamping a thin plate.

[0104] As shown in Figures 1 to 6 , an embodiment of the present application further provides a valve device 100 comprising the valve needle assembly of the aforementioned embodiment. The valve device further comprises a valve body 4 having a large valve port 44 that engages with a valve head component 1 . The valve head component 1 and a small valve needle 8 are slidably connected to the valve body 4 . When the valve head component 1 and the small valve needle 8 slide relative to the valve body 4 , the valve head component 1 opens or closes the large valve port 44 , thereby controlling the opening of the large valve port 44 .

[0105] Furthermore, the outer diameter of the large valve port 44 is relatively small, so as to facilitate fine control of the medium flow through the large valve port 44. For example, the valve device is a part of an air conditioning refrigerant valve, and the aperture of the large valve port 44 is 10 mm.

[0106] Furthermore, as shown in Figure 2, the valve body 4 also has a mounting hole 42, the valve head component 1 includes a third shaft segment 16, part of the third shaft segment 16 is located in the mounting hole 42, the third shaft segment 16 and the mounting hole 42 are adapted to each other, thereby realizing the sliding connection of the valve head component 1 to the valve body 4.

[0107] Furthermore, the valve body 4 further includes a flow channel hole 43. The flow channel hole 43 and the large valve port 44 form a stepped hole. The inner diameter of the flow channel hole 43 is larger than that of the large valve port 44. The flow channel hole 43 communicates with the first medium port 12. The valve body 4 also includes a second medium port 41, which communicates with the flow channel hole 43. In actual use, the medium can flow through the second medium port 41, the flow channel hole 43, and the large valve port 44, and can also flow through the second medium port 41, the flow channel hole 43, the first medium port 12, the third straight hole section 111, and the small valve port 21.

[0108] Furthermore, there are at least two second medium holes 41, and the at least two second medium holes 41 are arranged circumferentially. The at least two second medium holes 41 are evenly formed on the outer peripheral wall of the valve head component 1, so that when the medium flows into the flow channel hole 43 through the at least two second medium holes 41, the medium can flow evenly on the inner peripheral wall forming the flow channel hole 43, thereby improving the smoothness of the medium flow.

[0109] Those skilled in the art should understand that the various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A valve needle assembly, comprising a valve head component (1), a small valve needle (8), a valve port part (2), a valve port seat (3), and connecting parts (5, 6). The valve port part (2) has a small valve port (21) that cooperates with the small valve needle (8). The valve port seat (3) is farther from the small valve needle (8) than the valve port part (2). The valve head component (1) has a receiving hole (11). The valve port part (2) and a part of the valve port seat (3) are located in the receiving hole (11). The valve port part (2) is limited between the valve port seat (3) and the inner wall forming the receiving hole (11). The connecting parts (5, 6) are limit-connected to at least one of the outer peripheral wall and the outer end wall of the valve head component (1). The outer end wall of the valve head component (1) is located on the periphery of the receiving hole (11). The connecting parts (5, 6) are limit-connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat (3).

2. The valve needle assembly according to claim 1, wherein, The receiving hole (11) has a first straight hole section (113). The valve port part (2) is located in the first straight hole section (113). The valve port seat (3) includes a first diameter section (31). At least part of the first diameter section (31) is located in the first straight hole section (113).

3. The valve needle assembly according to claim 2, characterized in that, The outer diameter of the first diameter section (31) is smaller than the inner diameter of the first straight hole section (113). The inner wall forming the first straight hole section (113) includes a first inner peripheral wall (14). The outer peripheral wall of at least part of the first diameter section (31) is arranged with a gap relative to the first inner peripheral wall (14).

4. The valve needle assembly according to claim 3, characterized in that, The connecting parts (5, 6) are limit-connected to the outer peripheral wall of the first diameter section (31) and the first inner peripheral wall (14). Part of the connecting parts (5, 6) is located in the gap between the outer peripheral wall of the first diameter section (31) and the first inner peripheral wall (14).

5. The valve needle assembly according to any one of claims 2 to 4, characterized in that, The valve port seat (3) further includes a second diameter section (32). The outer diameter of the second diameter section (32) is larger than the outer diameter of the first diameter section (31). The second diameter section (32) is farther from the valve port part (2) than the first diameter section (31). The outer wall of the second diameter section (32) includes a stepped wall (36). The stepped wall (36) extends from the outer peripheral wall of the first diameter section (31) to the outer peripheral wall of the second diameter section (32).

6. The valve needle assembly according to claim 5, wherein, The outer diameter of the second diameter section (32) is larger than the inner diameter of the first straight hole section (113). At least part of the stepped wall (36) is arranged with a gap relative to the outer end wall of the valve head component (1).

7. The valve needle assembly according to claim 6, characterized in that, The connecting parts (5, 6) are limit-connected to the stepped wall (36) and the outer end wall of the valve head component (1). Part of the connecting parts (5, 6) is located in the gap between the stepped wall (36) and the outer end wall of the valve head component (1).

8. The valve needle assembly according to any one of claims 5 to 7, characterized in that, The accommodating hole (11) has a second straight hole section (114), the inner diameter of the second straight hole section (114) is larger than the inner diameter of the second diameter section (32), a part of the second diameter section (32) is located in the second straight hole section (114), the inner wall of the second straight hole section (114) includes a second bottom wall (1142), and at least a part of the stepped wall (36) is arranged at a gap relative to the second bottom wall (1142).

9. The valve needle assembly according to claim 8, wherein, The connecting part (5, 6) is limit-connected to the stepped wall (36) and the second bottom wall (1142), and a part of the connecting part (5, 6) is located in the gap between the stepped wall (36) and the second bottom wall (1142).

10. The valve needle assembly according to any one of claims 1 to 9, characterized in that, The outer wall of the valve port part (2) includes a first end wall (23) and a second end wall (24), the inner wall of the accommodating hole (11) includes a first bottom wall (15), at least a part of the first end wall (23) contacts the first bottom wall (15), and a part of the second end wall (24) contacts the inner end wall of the valve port seat (3).

11. The valve needle assembly according to any one of claims 1 to 10, characterized in that, The connecting part (5, 6) includes a welded part (5), the welded part (5) is formed on the outer peripheral wall of the valve port seat (3), and the welded part (5) is also formed on the outer end wall of the valve head component (1).

12. The valve needle assembly according to any one of claims 1 to 11, characterized in that, The connecting part (5, 6) includes a crimping part (6) formed by bending, the crimping part (6) and the valve head component (1) are of an integral structure, the crimping part (6) is formed on the outer end wall of the valve head component (1), and the crimping part (6) is also limit-connected to the outer end wall of the valve port seat (3).

13. A valve device, characterized in that, Including the valve needle assembly (200) according to any one of claims 1 to 12, the valve device (100) further includes a valve body (4), the valve body (4) has a large valve port (44) that cooperates with the valve head component (1), and the valve head component (1) and the small valve needle (8) are respectively slidably connected to the valve body (4).

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