Valve needle assembly, electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses a valve needle assembly, an electronic expansion valve and refrigeration equipment, and relates to the technical field of fluid control components, the valve needle assembly is applied to the electronic expansion valve, the valve needle assembly comprises a valve needle and a non-metal sealing piece, the valve needle is provided with a first end and a second end which are opposite, and the second end is used for being connected with a rotor of the electronic expansion valve; the non-metal sealing piece is connected to the first end and used for conducting soft sealing on a valve port of the electronic expansion valve. According to the technical scheme, the non-metal sealing piece is arranged at the first end of the valve needle, so that the non-metal sealing piece can slightly deform to conduct soft sealing with the valve port, the sealing performance of the electronic expansion valve is improved, and meanwhile the requirement for the machining precision of the non-metal sealing piece is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to a valve needle assembly, an electronic expansion valve and a refrigeration device. Background Art

[0002] For electronic expansion valves, especially large-diameter electronic expansion valves, when the valve needle and valve port are closed, the sealing curve length between the metal valve needle and the metal valve port increases significantly due to the increase in diameter, resulting in failure to meet the leakage requirements within the thermal management system.

[0003] At present, soft sealing technology is generally used to solve the problem of leakage in thermal management systems. In the prior art, a non-metallic seal is generally set at the valve port, and the seal needs to match the valve port height before it can be installed at the valve port, so this requires high processing accuracy of the seal. Utility Model Content

[0004] The main purpose of the utility model is to provide a valve needle assembly, an electronic expansion valve and a refrigeration device, aiming to reduce the requirements for the processing accuracy of non-metallic sealing parts.

[0005] In order to achieve the above-mentioned purpose, the valve needle assembly proposed in the utility model is applied to an electronic expansion valve, and the valve needle assembly includes:

[0006] A valve needle having a first end and a second end opposite to each other, wherein the second end is used for connecting to a rotor of the electronic expansion valve;

[0007] A non-metallic sealing component is connected to the first end, and the non-metallic sealing component is used to soft-seal the valve port of the electronic expansion valve.

[0008] In one embodiment, the non-metallic sealing member is sleeved on the outer peripheral wall of the first end, and the first end is provided with a riveted portion, and the riveted portion is riveted to the non-metallic sealing member.

[0009] In one embodiment, a mounting groove is formed on the outer peripheral wall of the first end, and the riveting portion rivets the sealing member into the mounting groove.

[0010] In one embodiment, the valve needle assembly further includes a gasket, which is disposed between the non-metallic sealing component and the riveted portion and connects the non-metallic sealing component and the riveted portion.

[0011] In one embodiment, the non-metallic seal has a mounting hole for the valve needle to pass through, a notch groove is formed on the inner wall surface of one end of the mounting hole away from the second end, the gasket is arranged in the notch groove, and the riveting part corresponds to the notch groove and is riveted to the gasket.

[0012] In one embodiment, the gasket is a stamped part.

[0013] In one embodiment, a port of the mounting hole close to the second end is provided with a chamfer.

[0014] In one embodiment, the non-metallic sealing component and the valve needle are integrally formed by injection molding.

[0015] In one embodiment, the non-metallic sealing component is made of polytetrafluoroethylene.

[0016] The utility model also provides an electronic expansion valve, comprising the valve needle assembly mentioned above.

[0017] In one embodiment, the outer periphery of the non-metallic seal is chamfered at one end close to the valve port, the inner wall surface of the valve port is a conical surface, and the conical surface is gradually tapered in a direction away from the valve needle assembly. When the valve port is closed, the rounded corner of the non-metallic seal abuts against the conical surface.

[0018] The utility model also provides a refrigeration device, comprising the above-mentioned electronic expansion valve.

[0019] The technical solution of the utility model arranges the non-metallic seal at the first end of the valve needle so that the non-metallic seal can be slightly deformed to form a soft seal with the valve port, thereby improving the sealing performance of the electronic expansion valve and reducing the processing accuracy requirements of the non-metallic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A structural schematic diagram of an embodiment of an electronic expansion valve provided by the utility model;

[0022] Figure 2 for Figure 1 A cross-sectional view of the middle valve needle assembly;

[0023] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 for Figure 2 Cross-section of the middle valve needle;

[0025] Figure 5 for Figure 2 Cross-section of a non-metallic seal.

[0026] Description of Figure Numbers:

[0027] 10. Electronic expansion valve; 100. Valve needle assembly; 200. Valve port; 110. Valve needle; 111. First end; 112. Second end; 113. Riveted portion; 114. Mounting groove; 120. Non-metallic sealing member; 121. Mounting hole; 122. Notch groove; 123. Chamfer; 124. Fillet; 130. Gasket; 210. Conical surface.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] The utility model provides a valve needle assembly 100 .

[0033] See also Figure 2 and Figure 3In one embodiment of the utility model, the valve needle assembly 100 is applied to an electronic expansion valve 10, and the valve needle assembly 100 includes a valve needle 110 and a non-metallic seal 120, the valve needle 110 has a first end 111 and a second end 112 relative to each other, and the second end 112 is used to connect the rotor of the electronic expansion valve 10; the non-metallic seal 120 is connected to the first end 111, and the non-metallic seal 120 is used to soft-seal the valve port 200 of the electronic expansion valve 10.

[0034] Specifically, the valve needle assembly 100 is applied to the electronic expansion valve 10 to realize the opening and closing of the valve port 200 of the electronic expansion valve 10. The valve needle assembly 100 includes a valve needle 110 and a non-metallic seal 120, and the valve needle 110 has a first end 111 and a second end 112 opposite to each other. The first end 111 of the valve needle 110 is connected to the non-metallic seal 120, and the second end 112 of the valve needle 110 is used to connect to the rotor of the electronic expansion valve 10. Through the connection with the rotor, the valve needle 110 can accurately control the opening and closing of the valve port 200, thereby adjusting the medium flow and pressure.

[0035] The non-metallic seal 120 performs a soft sealing function on the valve port 200 of the electronic expansion valve 10. By being connected to the first end 111 of the valve needle 110, the non-metallic seal 120 can be slightly deformed and fit perfectly with the valve port 200 to form an effective sealing structure, prevent medium leakage, and ensure the stability and reliability of the electronic expansion valve 10.

[0036] The non-metallic seal 120 is arranged at the first end 111 of the valve needle 110. The non-metallic seal 120 does not need to be highly matched with the size of the valve port 200 in order to be fixedly installed on the valve port 200, thereby reducing the requirements for the dimensional accuracy of the non-metallic seal 120, thereby reducing the processing difficulty and processing cost of the non-metallic seal 120. Moreover, the non-metallic seal 120 abuts against the inner wall surface of the valve port 200 to achieve the closure of the valve port 200. Therefore, the size of the non-metallic seal 120 arranged on the valve needle 110 is smaller, and the production cost of the non-metallic seal 120 is lower. In addition, for the scheme of setting the seal at the valve port 200, the seal is easily deformed by the installation force after installation, and the seal is arranged inside the valve port 200, so it is difficult to visually confirm and adjust the deformation problem of the seal, resulting in poor product consistency. The technical solution of the utility model can not only reduce the influence of the installation force on the non-metallic seal 120 by setting the non-metallic seal 120 at the first end 111 of the valve needle 110, but also can intuitively confirm and adjust the deformation of the non-metallic seal 120 before assembling the electronic expansion valve 10, thereby effectively improving the consistency of the product. In addition, the non-metallic seal 120 is more standardized, and only one part, the valve port 200, needs to be adjusted when adjusting the flow curve.

[0037] The technical solution of the utility model arranges the non-metallic seal 120 at the first end 111 of the valve needle 110 so that the non-metallic seal 120 can be slightly deformed to form a soft seal with the valve port 200, thereby improving the sealing performance of the electronic expansion valve 10 and reducing the processing accuracy requirements of the non-metallic seal 120.

[0038] In one embodiment, the non-metallic sealing member 120 is sleeved on the outer peripheral wall of the first end 111 . The first end 111 is provided with a riveted portion 113 , and the riveted portion 113 is riveted to the non-metallic sealing member 120 .

[0039] See also Figure 2 and Figure 3 The non-metallic seal 120 is sleeved on the outer peripheral wall of the first end 111 of the valve needle 110, and the rivet portion 113 is used to rivet with the non-metallic seal 120, which strengthens the connection between the non-metallic seal 120 and the valve needle 110, ensuring that it will not loosen or fall off during use, thereby ensuring the reliability and durability of the valve needle assembly 100. At the same time, the non-metallic seal 120 and the valve needle 110 are fixedly connected through the rivet portion 113, which can greatly reduce the processing accuracy requirements for the non-metallic seal 120, lower the cost, and more reliable the structure. In addition, the rivet portion 113 is riveted with the non-metallic seal 120, which can more conveniently test the coaxiality and roundness of the non-metallic seal 120 and the valve needle 110, so as to improve the coaxiality and roundness of the valve needle assembly 100.

[0040] In one embodiment, a mounting groove 114 is formed on the outer peripheral wall of the first end 111 , and the riveting portion 113 rivets the sealing member into the mounting groove 114 .

[0041] See also Figure 3 and Figure 4 The outer peripheral wall of the first end 111 is provided with a mounting groove 114, which extends along the circumference of the valve needle 110 and is annular. The function of the mounting groove 114 is to better accommodate and fix the non-metallic seal 120, ensure that the connection between the non-metallic seal 120 and the valve needle 110 is firm and reliable, and effectively prevent loosening or falling off due to vibration or pressure changes.

[0042] By forming the installation groove 114 on the outer peripheral wall of the first end 111, a suitable installation position can be provided for the non-metallic seal 120, so that it can be accurately positioned and aligned with the valve needle 110, ensuring that the non-metallic seal 120 will not be offset or loosened during operation. At the same time, when the riveting part 113 rivets the non-metallic seal 120 to the installation groove 114, a groove side wall of the installation groove 114 away from the first end 111 abuts against the non-metallic seal 120, so as to facilitate the riveting operation of the riveting part 113.

[0043] In addition, during the installation process, it is possible to determine whether the non-metallic seal 120 meets the standards by observing whether the circumferential side wall of the non-metallic seal 120 is flush with the outer circumferential wall of the valve needle 110, thereby ensuring the consistency of the valve needle assembly 100 and the valve port 200, thereby improving product quality.

[0044] In another embodiment, the non-metallic seal 120 may also be directly sleeved on the outer peripheral wall of the first end 111 of the valve needle 110, and the peripheral side wall of the non-metallic seal 120 protrudes from the outer peripheral wall of the valve needle 110. In this way, there is no need to set a mounting groove 114 for installing the non-metallic seal 120, and the processing of the valve needle 110 is simpler.

[0045] In one embodiment, the valve needle assembly 100 further includes a gasket 130 , which is disposed between the non-metallic sealing component 120 and the riveted portion 113 , and connects the non-metallic sealing component 120 and the riveted portion 113 .

[0046] See also Figure 3 The valve needle 110 and the non-metallic seal 120 are riveted together by a riveting portion 113. In order to reduce the deformation of the non-metallic seal 120 during the riveting process, a gasket 130 can be provided at the riveted position between the riveting portion 113 and the non-metallic seal 120 to buffer and disperse the riveting force, thereby preventing the deformation of the non-metallic seal 120 during the riveting process.

[0047] In one embodiment, the non-metallic sealing member 120 has a mounting hole 121 for the valve needle 110 to pass through, and a notch groove 122 is formed on the inner wall surface of one end of the mounting hole 121 away from the second end 112, and the gasket 130 is disposed in the notch groove 122, and the riveting portion 113 is riveted to the gasket 130 corresponding to the notch groove 122.

[0048] See also Figure 3 and Figure 5 The non-metallic seal 120 has a mounting hole 121 for the valve needle 110 to pass through, so that the non-metallic seal 120 can be sleeved on the outer peripheral wall of the first end 111 of the valve needle 110. A notch groove 122 is formed on the inner wall surface of the end of the mounting hole 121 away from the second end 112, and the notch groove 122 is used to accommodate the gasket 130. The rivet portion 113 is riveted to the gasket 130 corresponding to the notch groove 122, that is, there is no direct contact between the rivet portion 113 and the non-metallic seal 120, and the rivet portion 113 is riveted to the non-metallic seal 120 through the gasket 130, so that while the fixed connection between the rivet portion 113 and the non-metallic seal 120 is achieved, the gasket 130 can be used to reduce the riveting force of the rivet portion 113 on the non-metallic seal 120 to prevent the non-metallic seal 120 from deforming.

[0049] By forming a notch groove 122 on the inner wall surface of the end of the mounting hole 121 away from the second end 112, a suitable mounting position can be provided for the gasket 130, ensuring that the gasket 130 will not be offset or loosened during operation. At the same time, when the riveting part 113 rivets the non-metallic sealing member 120 to the mounting groove 114, a groove side wall of the notch groove 122 away from the first end 111 abuts against the gasket 130, so as to facilitate the riveting operation of the riveting part 113.

[0050] In another embodiment, the notch groove 122 may not be provided, and the gasket 130 is directly sandwiched between the riveted portion 113 and the non-metallic sealing member 120 , which simplifies the processing of the non-metallic sealing member 120 .

[0051] In one embodiment, the gasket 130 is a stamped part.

[0052] The material of the gasket 130 is metal, and the gasket 130 is formed by stamping, which can achieve precise control of the shape and size of the gasket 130 to ensure its fit with the notch 122. The stamping manufacturing process is simple and efficient, and can mass-produce gaskets 130 that meet specification requirements, thereby meeting production needs and ensuring stable product quality, and can reduce processing costs and production costs. In addition, stamping parts usually have good strength and wear resistance, which can extend the service life of the gasket 130.

[0053] In one embodiment, a chamfer 123 is disposed at an end of the mounting hole 121 close to the second end 112 .

[0054] See also Figure 5 On the one hand, during the assembly process of the valve needle 110 and the non-metallic seal 120, it is convenient for the first end 111 of the valve needle 110 to pass through the mounting hole 121, thereby reducing the difficulty of assembling the valve needle 110 and the non-metallic seal 120 and improving the installation efficiency and convenience. On the other hand, the chamfer 123 can remove the burrs on the end of the mounting hole 121, making it smoother and more uniform, and reducing the sharpness of the edge, thereby helping to prevent the valve needle 110 from being scratched or damaged during the assembly process.

[0055] In one embodiment, the non-metallic sealing member 120 and the valve needle 110 are integrally formed by injection molding.

[0056] The non-metallic seal 120 and the valve needle 110 are molded by secondary injection molding to achieve close integration and seamless connection between the two, avoiding possible seams or gaps in the traditional assembly process, and improving the stability of the connection between the non-metallic seal 120 and the valve needle 110. In addition, the injection molding process can also achieve precise molding of the non-metallic seal 120 and the valve needle 110, ensuring the accuracy and consistency of their shapes and sizes, and improving the quality stability and production efficiency of the product.

[0057] In one embodiment, the non-metallic sealing member 120 is made of polytetrafluoroethylene.

[0058] The non-metallic sealing member 120 achieves a soft seal with the inner wall of the valve port 200 by slightly deforming. Polytetrafluoroethylene has good elasticity and resilience, can quickly restore to its original shape under pressure, maintains sealing performance, and is not easy to deform permanently.

[0059] In other embodiments, the non-metallic sealing member 120 may also be made of materials such as PPS (polyphenylene sulfide) and PEEK (polyetheretherketone) that can produce slight deformation and have good elasticity and recovery.

[0060] The utility model also proposes an electronic expansion valve 10, which includes a valve needle assembly 100. The specific structure of the valve needle assembly 100 refers to the above embodiment. Since the electronic expansion valve 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0061] The electronic expansion valve 10 proposed in the utility model can be applied to an air-conditioning system, and the fluid medium flowing through the electronic expansion valve 10 is a refrigerant used for heat exchange in the air-conditioning system. At this time, the electronic expansion valve 10 is installed at the inlet of the evaporator of the air-conditioning system. The electronic expansion valve 10 serves as a dividing element between the high-pressure side and the low-pressure side of the air-conditioning system, and throttles and reduces the pressure of the high-pressure liquid refrigerant from the liquid storage dryer and other devices, thereby adjusting and controlling the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can meet the requirements of the external refrigeration load. Alternatively, the electronic expansion valve 10 is applied to other types of refrigeration equipment, and the fluid medium flowing through the electronic expansion valve 10 can also be other fluid media besides the refrigerant, as long as the electronic expansion valve 10 can achieve throttling and reducing the pressure of the fluid medium, and there is no specific restriction on this.

[0062] In one embodiment, a chamfered corner 124 is provided on the outer periphery of the non-metallic seal 120 at one end near the valve port 200, and the inner wall surface of the valve port 200 is a conical surface 210, which is gradually tapered in a direction away from the valve needle assembly 100. When the valve port 200 is closed, the rounded corner 124 of the non-metallic seal 120 abuts against the conical surface 210.

[0063] See also Figure 1 and Figure 5By applying a certain regular electric pulse to the coil, the rotor of the electronic expansion valve 10 is stimulated to rotate, thereby driving the valve stem of the electronic expansion valve 10 to rotate and move up and down in the nut assembly of the electronic expansion valve 10, and then driving the valve needle assembly 100 to open and close the valve port 200, so as to realize the switch and flow regulation of the electronic expansion valve 10. When the valve port 200 is closed, the conical surface 210 of the valve port 200 abuts against the fillet 124 of the non-metallic seal 120, and forms a line seal to ensure the sealing effect of the non-metallic seal 120 and the valve port 200. At the same time, the setting of the fillet 124 of the non-metallic seal 120 helps to reduce the friction between the non-metallic seal 120 and the valve port 200, improve the wear resistance of the non-metallic seal 120, and ensure the good fit between the non-metallic seal 120 and the valve port 200.

[0064] The utility model also proposes a refrigeration device, which includes an electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0065] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A valve needle assembly, applied to an electronic expansion valve, characterized in that: The valve needle assembly comprises: A valve needle having a first end and a second end opposite to each other, wherein the second end is used for connecting to a rotor of the electronic expansion valve; A non-metallic sealing component is connected to the first end, and the non-metallic sealing component is used to soft-seal the valve port of the electronic expansion valve.

2. The valve needle assembly according to claim 1, characterized in that: The non-metallic sealing component is sleeved on the outer peripheral wall of the first end. The first end is provided with a riveted portion, and the riveted portion is riveted to the non-metallic sealing component.

3. The valve needle assembly according to claim 2, characterized in that: An installation groove is formed on the outer peripheral wall of the first end, and the riveting portion rivets the sealing member in the installation groove.

4. The valve needle assembly according to claim 2 or 3, characterized in that: The valve needle assembly further includes a gasket, which is disposed between the non-metallic sealing component and the riveted portion and connects the non-metallic sealing component and the riveted portion.

5. The valve needle assembly according to claim 4, characterized in that: The non-metallic sealing component has a mounting hole for the valve needle to pass through, and a notch groove is formed on the inner wall surface of one end of the mounting hole away from the second end. The gasket is arranged in the notch groove, and the riveting part corresponds to the notch groove and is riveted to the gasket.

6. The valve needle assembly according to claim 5, characterized in that The gasket is a stamping part.

7. The valve needle assembly according to claim 5, characterized in that: A port of one end of the mounting hole close to the second end is provided with a chamfer.

8. The valve needle assembly according to claim 1, characterized in that: The non-metallic sealing component and the valve needle are integrally formed by injection molding.

9. The valve needle assembly according to claim 1, characterized in that: The non-metallic sealing component is made of polytetrafluoroethylene.

10. An electronic expansion valve, characterized in that: The invention comprises a valve needle assembly according to any one of claims 1 to 9.

11. The electronic expansion valve according to claim 10, characterized in that: The outer periphery of one end of the non-metallic seal close to the valve port is chamfered, and the inner wall surface of the valve port is a conical surface, which is gradually tapered in the direction away from the valve needle assembly. When the valve port is closed, the rounded corner of the non-metallic seal abuts against the conical surface.

12. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in claim 10 or 11.

Images