Valve needle assembly and valve device

Abstract

A valve needle assembly and a valve device relate to the field of thermal management systems, the valve needle assembly comprises a valve head part, a small valve needle, a valve port part, a valve port seat and a connecting part, the valve port part is provided with an accommodating hole, the valve port part and a part of the valve port seat are located in the accommodating hole, and correspondingly, a part of the valve port seat is located outside the accommodating hole. The connecting part is connected to at least one of the outer peripheral wall and the outer end wall of the valve head part in a limiting mode, the connecting part is connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat in a limiting mode, and the connecting part can be connected to the outer wall of the valve head part and the outer wall of the valve port seat in a limiting mode so that the valve needle assembly and the valve device can be assembled conveniently.

Description

Technical Field

[0001] The present invention relates to a thermal management system, and particularly to a valve needle assembly and a valve device. Background Art

[0002] The valve device applied to 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. A small valve port is formed in the sealing ring. The sealing ring and the small valve needle cooperate to form a soft seal 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, which results in the problem that the valve device is not convenient to assemble. Summary of the Invention

[0003] The purpose of the present invention is to provide a valve needle assembly, which has the advantage of being convenient to assemble.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention provides a valve needle assembly, including a valve head component, a small valve needle, a valve port part, a valve port seat and a connecting part. The valve port part has a small valve port that cooperates with the small valve needle. The valve port seat is away from the small valve needle relative to the valve port part. The valve head component has a receiving hole. The valve port part and part of the valve port seat are located in the receiving hole. The valve port part is limited between the valve port seat and the inner wall forming the receiving hole. The connecting part is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component. The outer end wall of the valve head component is located on the periphery of the receiving hole. The connecting part is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat.

[0006] On the other hand, the present invention provides a valve device, including the above valve needle assembly. The valve device further includes a valve body. The valve body has 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.

[0007] In a valve needle assembly provided by an embodiment of the present application, it includes a valve head component, a small valve needle, a valve port part, a valve port seat and a connecting part. The valve port component has a receiving hole. The valve port part and part of the valve port seat are located in the receiving hole. Correspondingly, part of the valve port seat is located outside the receiving hole. The connecting part is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve head component. The connecting part is limitedly connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat. The connecting part can be limitedly connected on the outer wall of the valve head component and the outer wall of the valve port seat, thereby facilitating the assembly of the valve needle assembly.

[0008] In a valve device provided by an embodiment of the present application, it includes a valve head component, a small valve needle, a valve port part, a valve port seat, a connecting part and a valve body. The valve head component and the small valve needle are respectively slidably connected to the valve body. The valve port component has a receiving hole, the valve port part and a part of the valve port seat are located in the receiving hole, correspondingly, a part of the valve port seat is located outside the receiving hole. The connecting part is limit-connected to at least one of the outer peripheral wall and the outer end wall of the valve head component, and the connecting part is limit-connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat. The connecting part can be limit-connected to the outer wall of the valve head component and the outer wall of the valve port seat, thereby facilitating the assembly of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a three-dimensional structural schematic diagram of a valve applying Embodiment 1 of the present invention;

[0010] Figure 2 is Figure 1 the sectional structural schematic diagram of;

[0011] Figure 3 is Figure 2 the partial enlarged structural view at "A" in;

[0012] Figure 4 is Figure 2 the sectional structural schematic diagram of the valve head component in;

[0013] Figure 5 is Figure 2 the sectional structural schematic diagram of the valve port part in;

[0014] Figure 6 is Figure 2 the sectional structural schematic diagram of the valve port seat in;

[0015] Figure 7 is a three-dimensional structural schematic diagram of a valve needle assembly provided by Embodiment 2 of the present invention;

[0016] Figure 8 is Figure 7 the sectional structural schematic diagram of;

[0017] Figure 9 is Figure 8 the partial enlarged structural view at "B" in;

[0018] Figure 10 is Figure 8 the sectional structural schematic diagram of the valve head component in;

[0019] Figure 11 is a three-dimensional structural schematic diagram of a valve needle assembly provided by Embodiment 3 of the present invention;

[0020] Figure 12 is Figure 11 the sectional structural schematic diagram of;

[0021] Figure 13 is Figure 12 The partial enlarged structural schematic diagram at "C" in

[0022] Figure 14 is Figure 12 The sectional structural schematic diagram of the valve port seat in

[0023] Figure 15 The three-dimensional structural schematic diagram of a valve needle assembly provided in Embodiment 4 of the present invention;

[0024] Figure 16 is Figure 15 The sectional structural schematic diagram of the valve needle assembly before stamping shown in

[0025] Figure 17 is Figure 16 The partial enlarged structural schematic diagram at "D" in

[0026] Figure 18 is Figure 17 The partial enlarged structural schematic diagram of the valve needle assembly after stamping shown in

[0027] Figure 19 is Figure 16 The sectional structural schematic diagram of the valve head component in

[0028] Figure 20 The three-dimensional structural schematic diagram of a valve needle assembly provided in Embodiment 5 of the present invention;

[0029] Figure 21 is Figure 20 The sectional structural schematic diagram of the valve needle assembly before stamping shown in

[0030] Figure 22 is Figure 21 The partial enlarged structural schematic diagram at "E" in

[0031] Figure 23 is Figure 22 The partial enlarged structural schematic diagram of the valve needle assembly after stamping shown in

[0032] Figure 24 is Figure 21 The sectional structural schematic diagram of the valve head component in

[0033] Figure 25 The three-dimensional structural schematic diagram of a valve needle assembly provided in Embodiment 6 of the present invention;

[0034] Figure 26 is Figure 25 The sectional structural schematic diagram of the valve needle assembly shown in

[0035] Figure 27 is Figure 26 a partial enlarged structural schematic diagram at "F" in

[0036] Figure 28 is Figure 25 a sectional structural schematic diagram of the valve head component in

[0037] Figure 29 is Figure 25 a structural schematic diagram of the clamping portion in

[0038] 100, valve device; 200, valve needle assembly; 1, valve head component; 2, valve port portion; 3, valve port seat; 4, valve body; 5, welded joint; 6, crimping 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 peripheral wall; 15, first bottom wall; 16, third shaft section; 17, shaft cavity; 18, first outer peripheral wall; 19, tapered inner peripheral 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 port; 22, fourth inner peripheral wall; 23, first end wall; 24, second end wall; 25, anti-fooling portion; 31, first diameter section; 32, second diameter section; 33, first inner end wall; 34, second outer end wall; 35, second outer peripheral wall; 36, stepped wall; 37, avoidance hole; 41, second medium hole; 42, mounting hole; 43, flow channel hole; 44, large valve port; 61, base section; 62, bent section; 71, cantilever beam; 81, tapered head; 82, first shaft section; 83, second shaft section; 321, third outer end wall; 322, third outer peripheral wall; 1111, third inner peripheral wall; 1141, second inner peripheral wall; 1142, second bottom wall. Detailed Embodiments

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0040] In the current technology, the valve device applied to 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 by sliding the valve head component, the opening degree of the large valve port can be controlled. The valve head component includes a small valve port, the valve needle assembly further includes a small valve needle, the small valve needle is slidably connected to the valve head component, and by sliding the small valve needle, the opening degree of the small valve port can be controlled. Both the valve head component and the small valve needle are made of metal materials, and a hard seal structure is formed between the small valve port and the small valve needle. However, the roundness of the small valve needle and at least one of the small valve ports are 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.

[0041] Furthermore, as described above, to improve the sealing performance between 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 axially in the mounting hole. The valve cover is fixedly connected to the inner wall forming the mounting hole. There is a problem that the connection structure between the valve cover and the valve head is not convenient for assembly.

[0042] Furthermore, the inner diameters of the large valve port and the small valve port need to be made very small to facilitate fine adjustment of the flow rate by the valve. For example, in the air conditioning system and thermal management system of an automobile, as an air conditioning refrigerant valve, the inner diameter of the large valve port is only 10 mm, and the inner diameter of the small valve port is only 2.5 mm. Correspondingly, the outer diameter of the valve head is controlled at about 10 mm, and the outer diameter of the small valve needle is controlled at about 2.5 mm. It is very difficult or even infeasible to achieve the fixed connection of the valve head and the valve cover with such small outer diameters by conventional technical means.

[0043] Based on the problems of the 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 port part 2, a valve port seat 3, and a connecting part (5, 6, 7). 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 part is 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 part is limit-connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat 3. The connecting part is limit-connected to the outer wall of the valve head component 1 and the outer wall of the valve port seat 3 to facilitate the assembly of the valve needle assembly.

[0044] To enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0045] The following combination Figures 1 to 29, a valve needle assembly provided by an embodiment of the present application will be introduced in detail. The valve needle assembly is a part of the valve device 100 and includes a valve head component 1, a small valve needle 8, a valve port part 2, a valve port seat 3, and a connecting part. 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 is located in the receiving hole 11. The connecting part limits and connects the valve head component 1 and the valve port seat 3. The valve port part 2 is limited between the valve port seat 3 and the inner wall forming the receiving hole 11. Specifically, the connecting part is limited and connected to at least one of the outer wall of the valve head component 1 and the outer wall of the valve port seat 3.

[0046] In a possible implementation, as Figure 3 , Figure 9 , Figure 13 , Figure 17 and Figure 22 shown, the connecting part is limited and 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 part is limited and connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat 3. That is, the connecting part is limited and connected on 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.

[0047] Furthermore, as Figure 3 , Figure 9 , Figure 13 , Figure 17 and Figure 22 shown, part of the valve port seat 3 is located in the receiving hole 11, thereby improving the connection stability between the valve port seat 3 and the valve head component 1. Correspondingly, part of the valve port seat 3 is exposed outside the receiving hole 11. That is to say, part of the outer peripheral wall of the valve port seat 3 is exposed outside the receiving hole 11, and the outer end wall of the valve port seat 3 is exposed outside the receiving hole 11, so as to facilitate the connecting part to be limited and connected to at least one of the outer peripheral wall and the outer end wall of the valve port seat 3.

[0048] 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 as to facilitate the connecting part to be limited and 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, and 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 part is limited and connected to at least one of the first outer peripheral wall 18 and the first outer end wall 13.

[0049] Further, the valve orifice portion 2 is made of an elastic material, and the elastic material includes, but is not limited to, plastic, so as to facilitate the formation of a soft seal structure between the inner wall of the small valve orifice 21 and the small valve needle 8. The valve orifice seat 3 is made of a metal material, and the metal material includes, but is not limited to, at least one of aluminum alloy, carbon steel, and stainless steel, and has the characteristics of high mechanical strength and corrosion resistance. Specifically, as Figure 2 shown, the inner wall forming the small valve orifice 21 includes a fourth inner peripheral wall 22, and at least a part of the outer peripheral wall of the small valve needle 8 contacts the fourth inner peripheral wall 22.

[0050] Further, the small valve needle 8 is slidably disposed relative to the valve head member 1. When the small valve needle 8 slides relative to the valve head member 1, the small valve needle 8 can open or close the small valve orifice 21, thereby controlling the opening degree of the small valve orifice 21.

[0051] Specifically, as Figure 2 and Figure 3 shown, the small valve needle 8 includes a first shaft section 82, the receiving hole 11 has a fourth straight hole section 112, at least a part of the first shaft section 82 is located in the fourth straight hole section 112, the first shaft section 82 and the fourth straight hole section 112 are adapted to each other, and the small valve needle 8 can slide along the axial direction of the fourth straight hole section 112. Moreover, during the process of the small valve needle 8 opening or closing the small valve orifice 21, at least a part of the first shaft section 82 is always located in the fourth straight hole section 112, preventing the medium from leaking through the fourth straight hole section 112.

[0052] Specifically, as Figure 2 shown, the small valve needle 8 further includes a second shaft section 83. The second shaft section 83 is farther from the valve orifice portion 2 than the first shaft section 82. The valve seat further has a shaft cavity 17. The shaft cavity 17 is farther from the valve orifice portion 2 than the fourth straight hole section 112. The second shaft section 83 is located in the shaft cavity 17, and the second shaft section 83 slides along the axial direction of the shaft cavity 17. The second shaft section 83 is limited between the two inner walls forming the shaft cavity 17, thereby defining the sliding stroke of the small valve needle 8 relative to the valve head member 1.

[0053] Further, as Figure 2 shown, the small valve needle 8 includes a tapered head 81, and the tapered head 81 is formed at one end of the small valve needle 8. When the small valve needle 8 closes the small valve orifice 21, at least a part of the tapered head 81 is located in the small valve orifice 21. The outer wall of the tapered head 81 can fully contact the inner wall forming the small valve orifice 21, and the tapered head 81 and the inner wall forming the small valve orifice 21 constitute a soft seal structure, thereby improving the sealing effect of the cooperation between the tapered head 81 and the small valve orifice 21.

[0054] Further, as Figure 2 and Figure 3As shown, the valve head component 1 further has a first medium hole 12, and the first medium hole 12 communicates with the accommodation hole 11. In actual use, when the small valve needle 8 opens the small valve port 21, the first medium hole 12, the accommodation hole 11, and the small valve port 21 are connected to form a pipeline for the medium to flow through. The medium can flow through the first medium hole 12, the accommodation hole 11, and the small valve port 21 in sequence. The accommodation 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 are evenly located on the inner peripheral wall forming the accommodation hole 11. In actual use, the medium can flow into the accommodation hole 11 evenly from the circumference of the accommodation hole 11, improving the flow stability of the medium flowing into the accommodation hole 11.

[0055] Further, the inner diameter of the small valve port 21 is small to facilitate more precise adjustment of the medium flow rate. For example, this valve needle assembly is part of an air-conditioning refrigerant valve, and the small valve port 21 is 2.5 mm.

[0056] Further, as Figure 3 and Figure 6 shown, the valve port seat 3 is generally an axial part. The valve port seat 3 has an avoidance hole 37, and the avoidance hole 37 penetrates through the valve port seat 3. The avoidance hole 37 communicates with the small valve port 21 to prevent the valve port seat 3 from obstructing the flow of the medium. In actual use, the medium can flow through the first medium hole 12, the fourth straight hole section 112, the small valve port 21, and the avoidance hole 37.

[0057] In a possible implementation manner, the accommodation hole 11 has a first straight hole section 113, the valve port part 2 is located in the first straight hole section 113, and 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.

[0058] Further, as Figure 12 and Figure 13 、 Figure 17 and Figure 18 shown, the shape of the valve port seat 3 is a straight shaft and is composed of the first diameter section 31. The outer peripheral wall of the valve port seat 3 includes the outer peripheral wall of the first diameter section 31. The outer peripheral wall of the first diameter section 31 is the second outer peripheral wall 35, and part of the second outer peripheral wall 35 is exposed outside the accommodation hole 11. The outer end wall of the valve port seat 3 is the outer end wall of the first diameter section 31. The outer end wall of the first diameter section 31 is the second outer end wall 34, and the second outer end wall 34 is exposed outside the accommodation hole 11 to facilitate the connecting part to be limited and connected to at least one of the second outer peripheral wall 35 and the second outer end wall 34.

[0059] The first diameter section 31 and the first straight hole section 113 can be any one of a clearance fit, an interference fit, and a transition fit. In a 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 part of the outer peripheral wall of the first diameter section 31 is arranged at a gap relative to the inner wall of the first straight hole section 113, so as to facilitate the assembly of the first diameter section 31 into the first straight hole section 113. The outer peripheral wall of the first diameter section 31 is the second outer peripheral wall 35, and the inner wall forming the first straight hole section 113 includes the first inner peripheral wall 14, and at least part of the second outer peripheral wall 35 is arranged at a gap relative to the first inner peripheral wall 14.

[0060] Further, as Figure 12 and Figure 13 shown, part of the connecting portion is limit-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 connection stability between the valve head component 1 and the valve port seat 3. Specifically, a gap is left between the second outer peripheral wall 35 and the first inner peripheral wall 14, and when the connecting portion is limit-connected to the second outer peripheral wall 35 and the first outer end wall 13, part 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, avoiding the problem of the connecting portion breaking.

[0061] In a possible implementation, the shape of the valve port seat 3 is generally a hollow stepped shaft. 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 portion 2 relative to the first diameter section 31. The outer wall of the second diameter section 32 includes a stepped wall 36, and 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. When the connecting portion is limit-connected to the valve port seat 3, it can be considered to limit-connect the connecting portion to the outer peripheral wall and the outer end wall of the second diameter section 32, and the outer diameter of the second diameter section 32 is larger than the outer diameter of the first diameter section 31, thereby facilitating the assembly of the connecting portion and the valve port seat 3.

[0062] Further, as Figure 3 、 Figure 9 and Figure 23 shown, the outer peripheral wall of the valve port 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, and at least part of the third outer peripheral wall 322 is exposed outside the receiving hole 11. The outer end wall of the valve port 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, and the third outer end wall 321 is exposed outside the receiving hole 11. The connecting portion is limit-connected to at least one of the third outer peripheral wall 322 and the third outer end wall 321.

[0063] ​In a 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 part of the step wall 36 is arranged with a clearance relative to the outer end wall of the valve head component 1 to avoid wear caused by contact between the second diameter section 32 and the valve head component 1. Specifically, the second diameter section 32 is not located in the first straight hole section 113, and the second diameter section 32 is exposed outside the receiving hole 11.

[0064] Furthermore, as Figure 3 shown, the second diameter section 32 is located outside the receiving hole 11, and a part of the connecting portion is limitedly connected to the step wall 36 and the first outer end wall 13. Thereby, the connection stability between the valve head component 1 and the valve port seat 3 is improved. Specifically, there is a clearance between the step wall 36 and the first outer end wall 13. When the connecting portion is limitedly connected to the third outer peripheral wall 322 and the first outer end wall 13, a part of the connecting portion can penetrate into this clearance. Specifically, the clearance between the step wall 36 and the first outer end wall 13 is less than 2 mm to avoid the problem of fracture of the connecting portion.

[0065] Furthermore, the sum of the axial length of the valve port portion 2 and the axial length of the first diameter section 31 is greater than the axial length of the first straight hole section 113, so that after the valve needle assembly is assembled, a clearance is reserved between the step wall 36 and the first outer end wall 13.

[0066] The second diameter section 32 and the second straight hole section 114 can be any one of clearance fit, transition fit and interference fit. In a possible implementation, as Figure 9 and Figure 23 shown, the receiving hole 11 has a second straight hole section 114, the inner diameter of the second straight hole section 114 is greater than the outer diameter of the second diameter section 32, and a part of the second diameter section 32 is located in the second straight hole section 114, further improving the connection stability between the valve port 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 part of the third outer peripheral wall 322 is arranged with a clearance 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 further includes a second bottom wall 1142, the second bottom wall 1142 extends from the first inner peripheral wall 14 to the second inner peripheral wall 1141, and at least a part of the step wall 36 is arranged with a clearance relative to the second bottom wall 1142 to avoid wear caused by contact between the valve port seat 3 and the valve head component 1.

[0067] Furthermore, as Figure 9As shown, a part of the second diameter section 32 is exposed outside the receiving hole 11, a part of the connecting portion is limitedly connected to the third outer peripheral wall 322 and the second inner peripheral wall 1141, and there is a gap between the third outer peripheral wall 322 and the second inner peripheral wall 1141. When the connecting portion is limitedly connected to the first outer end wall 13 and the third outer peripheral wall 322, a part of the connecting portion penetrates into this gap, and then is limitedly connected to the third outer 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 to avoid the problem of breakage of the connecting portion.

[0068] 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 as to leave a gap between the step wall 36 and the second bottom wall 1142 after the valve needle assembly is assembled.

[0069] Furthermore, as Figure 4 shown, the shape of the receiving hole 11 is a stepped hole. The receiving hole 11 further has a third straight hole section 111. The third straight hole section 111 is farther from the second straight hole section 114 than the first straight hole section 113. The fourth straight hole section 112 is farther from the first straight hole section 113 than the third straight hole section 111. The first medium hole 12 is located on the inner wall forming the third straight hole section 111. 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 less than the inner diameter of the third straight hole section 111, which is less than the inner diameter of the first straight hole section 113, which is less than the inner diameter of the second straight hole section 114, so as to facilitate the assembly of the valve head component 1 with the small valve needle 8, the valve port part 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 on the third inner peripheral wall 1111.

[0070] In a possible implementation manner, as Figure 5 shown, the outer wall of the valve port part 2 includes a first end wall 23 and a second end wall 24. The inner wall forming the receiving 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 at least a part of the second end wall 24 contacts the inner end wall of the valve port seat 3. The valve port seat 3 limits the valve port part 2 in the axial direction of the receiving hole 11, thereby improving the anti-inner leakage performance of the valve needle assembly.

[0071] Furthermore, the first end wall 23 and the second end wall 24 are located at both ends of the valve port part 2. The inner wall forming the first straight hole section 113 includes a first bottom wall 15. The first bottom wall 15 is located on the circumferential side of the third straight hole section 111, thereby improving the anti-inner leakage performance of the valve needle assembly. The inner end wall and the outer end wall of the valve port seat 3 are respectively located at both ends of the valve port seat 3. The inner end wall of the valve port seat 3 is located inside the receiving hole 11. The inner end wall of the valve port seat 3 is the inner end wall of the first diameter section 31, and the inner end wall of the first diameter section 31 is the first inner end wall 33.

[0072] Further, as Figure 5 shown, the valve port portion 2 includes an anti-misassembly portion 25 formed on the first end wall 23 or the second end wall 24. The anti-misassembly portion 25 is designed to visually distinguish the first end wall 23 from the second end wall 24, avoid the problem of incorrect assembly of the valve port portion 2 relative to the receiving hole 11, and ensure that the first end wall 23 and the first bottom wall 15 can contact each other.

[0073] Further, the anti-misassembly portion 25 includes at least one of, but is not limited to, a groove, a protrusion, a hole, and a mark, as long as it satisfies that the user can visually perceive the anti-misassembly portion 25. As shown in the figure, the anti-misassembly portion 25 is a groove formed on the second end wall 24, which is convenient for directly forming the anti-misassembly portion 25 as a groove on the second end wall 24 during the process of manufacturing the valve port portion 2 by an injection molding process.

[0074] Further, at least a part of the outer wall of the valve port portion 2 contacts the inner wall of the first straight hole section 113, which also improves the anti-inner leakage performance of the valve needle assembly. Specifically, the outer wall of the valve port portion 2 includes the outer peripheral wall of the valve port portion 2, and the inner wall of the first straight hole section 113 includes the first inner peripheral wall 14. At least a part of the outer peripheral wall of the valve port portion 2 contacts the first inner peripheral wall 14. The inner wall of the first straight hole section 113 also includes the first bottom wall 15, and the first bottom wall 15 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 port portion 2 also includes the first end wall 23, and at least a part of the first bottom wall 15 contacts the first end wall 23.

[0075] Further, at least one surface of the first end wall 23 and the first bottom wall 15 is ground to eliminate possible defects, particles, and unevenness on at least one surface of the first end wall 23 and the first bottom wall 15, improve the flatness and roughness, and further improve the anti-inner leakage performance of the valve needle assembly. Specifically, the surface roughness of the first end wall 23 reaches Ra 0.8 or more, and the surface roughness of the first bottom wall 15 reaches Ra 0.8 or more.

[0076] Further, the valve port portion 2 is in a compressed state. The valve port portion 2 in the compressed state tends to return to its original state and then applies an elastic force to the valve head component 1. The elastic force applied by the valve port portion 2 to the valve head component 1 makes the first end wall 23 and the first bottom wall 15 fit together more tightly. The first end wall 23 and the first bottom wall 15 cooperate to form a tight soft seal structure, avoiding leakage of the medium between the first bottom wall 15 and the first end wall 23, and further improving the anti-inner leakage performance of the valve needle assembly.

[0077] In a possible implementation manner, the connecting portion includes at least one of a welding portion 5 and a crimping portion 6.

[0078] In a possible implementation manner, asFigure 3 , Figure 9 and Figure 13 As shown in Figure 13 , the connecting portion includes a welded portion 5 formed by welding. The welded portion 5 is formed on the outer peripheral wall of the valve port seat 3, and the welded portion 5 is also formed on the outer end wall of the valve head member 1.

[0079] Furthermore, the welded portion 5 is formed on the valve port seat 3 and the valve head member 1 by a welding method. The welding method includes but is not limited to at least one of laser welding, ultrasonic welding, soldering, gas welding, tungsten inert gas welding, and submerged arc welding. Specifically, the welding method is laser welding. During the welding process, the laser beam directly acts on the valve port seat 3 and the valve head member 1, and the surfaces of the valve port seat 3 and the valve head member 1 are heated to form a molten pool. After the molten pool cools and solidifies, the welded portion 5 can be formed, which is convenient for welding the miniaturized valve head member 1 and the valve port seat 3.

[0080] Furthermore, as Figure 3 , Figure 9 and Figure 13 shown, the welded portion 5 includes a fillet weld 51. When the valve port seat 3 is composed of a first diameter section 31, the fillet weld 51 is formed on the second outer peripheral wall 35 and the first outer end wall 13. When the valve port seat 3 is composed of a first diameter section 31 and a second diameter section 32, the fillet weld 51 is formed on the third outer peripheral wall 322 and the first outer end wall 13. Specifically, the shape of the fillet weld 51 is annular, the fillet weld 51 surrounds the valve port seat 3, and the fillet weld 51 is also located on the periphery of the receiving hole 11, thereby improving the connection stability between the valve port seat 3 and the valve head member 1.

[0081] Furthermore, as Figure 3 shown, the second diameter section 32 is located outside the receiving hole 11. The welded portion 5 further includes a first butt weld 52. The welded portion 5 is composed of the fillet weld 51 and the first butt weld 52. The first butt weld 52 is formed on the stepped wall 36 and the first outer end wall 13, thereby improving the connection stability between the valve port seat 3 and the valve head member 1. The first butt weld 52 is also located on the periphery of the receiving hole 11, and seals the gap between the stepped wall 36 and the first outer end wall 13, thereby improving the anti-inner leakage performance of the valve needle assembly. During the process of welding to obtain the fillet weld 51, the stepped wall 36 and the first outer end wall 13 are heated to form a molten pool, and the molten pool cools and solidifies to form the first butt weld 52.

[0082] Furthermore, as Figure 9 and Figure 13As shown, a part of the second diameter section 32 is located inside the receiving hole 11. Correspondingly, a part of the second diameter section 32 is located outside the receiving hole 11. The welding part 5 further includes a second flat weld 53. The welding part 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 connection stability between the valve seat 3 and the valve head component 1. The second flat weld 53 is substantially annular. The second flat weld 53 is located on the inner wall forming the receiving hole 11, playing a role in sealing the third outer peripheral wall 322 and the second inner peripheral wall 1141, thereby improving the anti-inner leakage performance of the valve needle assembly. During the process of welding to obtain the fillet weld 51, the third outer peripheral wall 322 and the second inner peripheral wall 1141 are heated to form a molten pool, and the second flat weld 53 can be formed after the molten pool cools and solidifies.

[0083] In a possible implementation manner, as Figure 17 、 Figure 18 、 Figure 22 and Figure 23 shown, the connecting part 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 connected to the outer end wall of the valve seat 3 in a limiting manner.

[0084] Furthermore, the crimping part 6 is bent by a plastic processing method. The plastic processing method means that the crimping part 6 undergoes plastic deformation under the action of at least one external force, and then is connected to the outer end wall of the valve seat 3 in a limiting manner. The plastic processing method includes but is not limited to at least one of forging, extrusion, drawing, stamping, and spinning. Specifically, the plastic processing method is stamping. A high-precision mold can be used to stamp the crimping part 6 to cause bending, so as to facilitate the processing of the miniaturized valve seat 3 and valve head component 1.

[0085] Furthermore, the crimping part 6 can be divided into a base section 61 and a bent section 62 according to its bending position. 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 of an integral structure. The bent section 62 is connected to the outer end wall of the valve seat 3 in a limiting manner. Specifically, the bending angle of the bent section 62 relative to the base section 61 is approximately 90°, so as to facilitate the bent section 62 to fully abut against the outer end wall of the valve seat 3.

[0086] Furthermore, the shape of the crimping part 6 is plate-shaped, so as to facilitate the processing of the crimping part 6 by stamping. Specifically, considering that a part of the first crimping part 6 is located on the outer peripheral wall of the valve seat 3, the shape of the crimping part 6 is an arc-shaped plate, thereby improving the connection stability between the first crimping part 6 and the valve seat 3.

[0087] Furthermore, there are at least three crimping portions 6. The at least three crimping portions 6 enclose a circular area, and a part of the valve port seat 3 is located within the circular area, thereby improving the connection stability between the valve port seat 3 and the crimping portions 6. Specifically, the at least three base segments 61 enclose the circular area, and the at least three bending segments 62 are limit-connected to the outer end wall of the valve port seat 3.

[0088] Furthermore, the valve port seat 3 is composed of a first diameter segment 31, and the crimping portion 6 is limit-connected to the second outer end wall 34, thereby limiting the valve port portion 2 in the axial direction of the receiving hole 11.

[0089] Furthermore, the valve port seat 3 is composed of a first diameter segment 31 and a second diameter segment 32, and the crimping portion 6 is limit-connected to the third outer end wall 321, thereby limiting the valve port portion 2 in the axial direction of the receiving hole 11.

[0090] In a possible implementation manner, as Figures 25 to 29 shown, at least one of the connection manner between the connecting portion and the valve head component 1 and the connection manner between the connecting portion and the valve port seat 3 includes a clamping manner, which simplifies the assembly operation of the connecting portion with the valve head component 1 and / or the valve port seat 3, and thereby facilitates the assembly of the valve needle assembly. Specifically, the valve port seat 3 is clamped and connected to the connecting portion; or, the valve head component 1 is clamped and connected to the connecting portion; or, the connecting portion is clamped and connected to both the valve head component 1 and the valve port seat 3.

[0091] Furthermore, the connecting portion includes a clamping portion 7. The clamping portion 7 and the valve port seat 3 are of an integral structure, and the clamping portion 7 is clamped and connected to the valve head component 1, which simplifies the structures of the connecting portion, the valve head component 1 and the valve port seat 3 and the assembly operation, and thereby facilitates the assembly of the valve needle assembly.

[0092] Furthermore, the clamping portion 7 and the receiving hole 11 form a clamping structure. At least a part of the clamping portion 7 is located within the receiving hole 11, and the outer wall of at least a part of the clamping portion 7 contacts the inner wall 11 forming the receiving hole 11, thereby improving the structural compactness.

[0093] Furthermore, the inner wall forming the receiving hole 11 includes a top wall 20. The top wall 20 is formed on the inner peripheral wall of the receiving hole 11. The top wall 20 is relatively far from the valve port seat 3 with respect to the clamping portion 7. The outer wall of at least a part of the clamping portion 7 contacts the top wall 20, thereby the clamping portion 7 limits the valve port seat 3 in the axial direction of the receiving hole 11.

[0094] Furthermore, the shape of the top wall 20 is annular, thereby improving the limiting effect of the top wall 20 on the clamping portion 7. Specifically, the opening of the receiving hole 11 is located inside the annular top wall 20. At least a part of the valve port portion 2 and at least a part of the valve port seat 3 are located in the axial direction of the opening of the receiving hole 11, so as to facilitate the assembly of the valve port portion 2 and the valve port seat 3 into the receiving hole 11 through the opening of the receiving hole 11.

[0095] Further, the inner peripheral wall of the receiving hole 11 includes a conical inner peripheral wall 19, and a top wall 20 is formed on the conical inner peripheral wall 19. The conical inner peripheral wall 19 functions as an avoidance position. At least a part of the engaging portion 7 is located inside the conical inner peripheral wall 19, allowing at least a part of the engaging portion 7 to be inclined relative to the conical inner peripheral wall 19, facilitating the assembly of the valve port portion 2, the valve port seat 3, and the engaging portion 7 into the receiving hole 11. Specifically, the inner peripheral wall of the receiving hole 11 further includes a first inner peripheral wall 14. The valve port portion 2 is located inside the first inner peripheral wall 14, and a part of the valve port seat 3 is located on the first inner peripheral wall 14. The first inner peripheral wall 14 is formed at the end with a smaller inner diameter of the conical inner peripheral wall 19, and the top wall 20 is formed at the end with a larger inner diameter of the conical inner peripheral wall 14, thereby allowing the valve port portion 2, the valve port seat 3, and the engaging portion 7 to retract a certain distance towards the top wall 20.

[0096] Further, the engaging portion 7 is a cantilever beam 71. The cantilever beam 71 can be deformed along the radial direction of the valve port seat 3, and at least a part of the cantilever beam 71 contacts the top wall 20. When the cantilever beam 71 is deformed by force, at least a part of the engaging portion 7 moves away from or approaches the valve head component 1. When at least a part of the engaging portion 7 moves away from the valve head component 1, it functions as an avoidance position to facilitate the assembly of the engaging portion 7, the valve port seat 3, and the valve head component 1. When at least a part of the engaging portion 7 approaches the valve head component 1, the engaging portion 7 and the valve head component 1 are tightly connected, thereby improving the connection stability. 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.

[0097] Further, the cantilever beam 71 is formed on the outer peripheral wall of the valve port 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.

[0098] Further, there are at least two cantilever beams 71. At least two cantilever beams 71 enclose a circular area, and at least two cantilever beams 71 can abut against the top wall 20, thereby improving the connection stability between the engaging portion 7 and the valve head component 1.

[0099] Further, the adjacent cantilever beams 71 are arranged with a gap therebetween. The gap between the adjacent cantilever beams 71 avoids interference between them, thereby facilitating the assembly of at least two cantilever beams 71 and the valve head component 1.

[0100] Further, the integral structure of the cantilever beam 71 and the valve port seat 3 is a thin-walled part and is made by a stamping process. In this stamping process, the thin plate is cut and stamped to obtain the integral structure of the cantilever beam 71 and the valve port seat 3.

[0101] As Figures 1 to 6As shown in the figure, an embodiment of the present application further provides a valve device 100, including the valve needle assembly of the above embodiment. The valve device further includes a valve body 4, and the valve body 4 has a large valve port 44 that cooperates with the valve head component 1. The valve head component 1 and the small valve needle 8 are respectively 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 degree of the large valve port 44.

[0102] Further, the outer diameter of the large valve port 44 is relatively small, so as to facilitate the refined control of the medium flow rate passing 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.

[0103] Further, as Figure 2 shown in the figure, the valve body 4 further has a mounting hole 42. The valve head component 1 includes a third shaft section 16, and a part of the third shaft section 16 is located in the mounting hole 42. The third shaft section 16 and the mounting hole 42 are adapted to each other, thereby realizing the sliding connection between the valve head component 1 and the valve body 4.

[0104] Further, the valve body 4 further has 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 the inner diameter of the large valve port 44, and the flow channel hole 43 communicates with the first medium hole 12. The valve body 4 further includes a second medium hole 41, and the second medium hole 41 communicates with the flow channel hole 43. In actual use, the medium can flow through the second medium hole 41, the flow channel hole 43, and the large valve port 44, and can also flow through the second medium hole 41, the flow channel hole 43, the first medium hole 12, the third straight hole section 111, and the small valve port 21.

[0105] Further, there are at least two second medium holes 41. At least two second medium holes 41 are arranged circumferentially, and 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 at least two second medium holes 41, the medium can flow evenly on the inner peripheral wall of the formed flow channel hole 43, improving the smoothness of the medium flow.

[0106] Those skilled in the art should understand that the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as within the scope described in this specification.

[0107] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present application. Various modifications to these embodiments will be readily apparent to those 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. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded 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 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 periphery of the receiving hole (11). The connecting parts (5, 6) are limitedly 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, characterized in that, 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 a 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, wherein, 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). At least a part of the outer peripheral wall 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 limitedly connected to the outer peripheral wall of the first diameter section (31) and the first inner peripheral wall (14). A 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 step wall (36). The step 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 a part of the step 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 limitedly connected to the step wall (36) and the outer end wall of the valve head component (1). A part of the connecting parts (5, 6) is located in the gap between the step 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 accommodation 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, characterized in that, The connecting part (5, 6) is limitedly 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 accommodation 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 crimped part (6) formed by bending, the crimped part (6) and the valve head component (1) are of an integral structure, the crimped part (6) is formed on the outer end wall of the valve head component (1), and the crimped part (6) is also limitedly 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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