Valve needle assembly, electronic expansion valve and refrigeration equipment

Abstract

The invention 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 part, 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 present application 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

[0002] The electronic expansion valve, especially the large-diameter electronic expansion valve, when the valve needle and the valve port are in the closed state, the sealing curve length of the metal valve needle and the metal valve port increases greatly due to the increase in the diameter, which cannot meet the leakage requirement in the thermal management system.

[0003] At present, the soft sealing technology is generally used to solve the leakage problem in the thermal management system. In the prior art, a sealing member made of non-metal material is arranged at the valve port, and the sealing member needs to be highly matched with the valve port to be installed at the valve port, so that the machining precision of the sealing member is required to be high. SUMMARY

[0004] The main purpose of the present application is to provide a valve needle assembly, an electronic expansion valve and a refrigeration device, which aims to reduce the machining precision requirement of the non-metal sealing member.

[0005] To achieve the above-mentioned purpose, the valve needle assembly provided by the present application is applied to an electronic expansion valve, and the valve needle assembly comprises:

[0006] a valve needle having opposite first and second ends, the second end being used for connecting a rotor of the electronic expansion valve;

[0007] a non-metal sealing member connected to the first end, the non-metal sealing member being used for soft sealing a valve port of the electronic expansion valve.

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

[0009] In an embodiment, the outer peripheral wall of the first end is formed with a mounting groove, and the riveting portion is used for riveting the sealing member in the mounting groove.

[0010] In an embodiment, the valve needle assembly further comprises a gasket, the gasket is arranged between the non-metal sealing member and the riveting portion, and the gasket connects the non-metal sealing member and the riveting portion.

[0011] In an embodiment, the non-metal sealing member has a mounting hole through which the valve needle passes, an inner wall surface of one end of the mounting hole away from the second end is formed with a notched groove, the gasket is arranged in the notched groove, and the riveting portion is riveted with the gasket corresponding to the notched groove.

[0012] In an embodiment, the gasket is a stamping part.

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

[0014] In an embodiment, the non-metallic sealing piece is integrally formed with the valve needle by injection molding.

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

[0016] The application also provides an electronic expansion valve comprising the valve needle assembly.

[0017] In an embodiment, the non-metallic sealing piece is provided with a chamfer near the outer periphery of one end of the valve port, the inner wall surface of the valve port is a tapered surface, and the tapered surface is tapered away from the valve needle assembly, and the chamfer of the non-metallic sealing piece abuts against the tapered surface when the valve port is closed.

[0018] The application also provides a refrigeration device comprising the electronic expansion valve.

[0019] The technical solution of the application sets the non-metallic sealing piece at the first end of the valve needle, so that the non-metallic sealing piece can be slightly deformed to perform soft sealing with the valve port, thereby improving the sealing performance of the electronic expansion valve and reducing the processing precision requirement of the non-metallic sealing piece. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor.

[0021] Figure 1 The structure schematic diagram of an embodiment of the electronic expansion valve provided by the application;

[0022] Figure 2 The structure schematic diagram of an embodiment of the electronic expansion valve provided by the application; Figure 1 The sectional view of the valve needle assembly in the embodiment;

[0023] Figure 3 The structure schematic diagram of an embodiment of the electronic expansion valve provided by the application; Figure 2 The enlarged view of A in the embodiment;

[0024] Figure 4 The structure schematic diagram of an embodiment of the electronic expansion valve provided by the application; Figure 2 The sectional view of the valve needle in the embodiment;

[0025] Figure 5 The structure schematic diagram of an embodiment of the electronic expansion valve provided by the application; Figure 2 The sectional view of the non-metallic sealing piece in the embodiment.

[0026] Brief Description of Drawings

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

[0028] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present application.

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

[0031] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0032] The present application proposes a valve needle assembly 100.

[0033] Please refer to Figure 2 and Figure 3In an embodiment of the present application, the valve needle assembly 100 is applied to the electronic expansion valve 10, and the valve needle assembly 100 comprises a valve needle 110 and a non-metallic sealing member 120, the valve needle 110 has opposite first and second ends 111 and 112, the second end 112 is used to connect the rotor of the electronic expansion valve 10, and the non-metallic sealing member 120 is connected to the first end 111, and the non-metallic sealing member 120 is used to perform soft sealing on 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 comprises a valve needle 110 and a non-metallic sealing member 120, and the valve needle 110 has opposite first and second ends 111 and 112. The first end 111 of the valve needle 110 is connected to the non-metallic sealing member 120, and the second end 112 of the valve needle 110 is used to connect the rotor of the electronic expansion valve 10, and 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 sealing member 120 performs the function of soft sealing 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 sealing member 120 can be slightly deformed and perfectly fit the valve port 200, forming an effective sealing structure to prevent medium leakage and ensure the stability and reliability of the electronic expansion valve 10.

[0036] The non-metallic sealing member 120 is arranged at the first end 111 of the valve needle 110, and the non-metallic sealing member 120 does not need to be fixedly installed on the valve port 200, but is highly matched with the size of the valve port 200, thereby reducing the requirement for the size precision of the non-metallic sealing member 120, and further reducing the processing difficulty and processing cost of the non-metallic sealing member 120. Moreover, the non-metallic sealing member 120 abuts against the inner wall surface of the valve port 200 to realize the closing of the valve port 200, and therefore, the size of the non-metallic sealing member 120 arranged on the valve needle 110 is smaller, and the production cost of the non-metallic sealing member 120 is lower. In addition, for the scheme of arranging the sealing member on the valve port 200, the sealing member is easily deformed by the installation force after installation, and the sealing member is arranged inside the valve port 200, and it is difficult to visually confirm and adjust the deformation of the sealing member, thereby leading to poor consistency of the product. The technical scheme of the present application arranges the non-metallic sealing member 120 at the first end 111 of the valve needle 110, which not only reduces the influence of the installation force on the non-metallic sealing member 120, but also enables the deformation of the non-metallic sealing member 120 to be visually confirmed and adjusted before the electronic expansion valve 10 is assembled, thereby effectively improving the consistency of the product. In addition, the non-metallic sealing member 120 has a higher degree of standardization, and only one part of the valve port 200 needs to be adjusted when adjusting the flow curve.

[0037] The technical scheme of the present application sets the non-metallic sealing element 120 at the first end 111 of the valve needle 110, so that the non-metallic sealing element 120 can be slightly deformed to achieve a soft seal with the valve port 200, thereby improving the sealing performance of the electronic expansion valve 10 while reducing the processing precision requirements of the non-metallic sealing element 120.

[0038] In an embodiment, the non-metallic sealing element 120 is sleeved on the outer peripheral wall of the first end 111, and the first end 111 is provided with a riveting portion 113 for riveting with the non-metallic sealing element 120.

[0039] Referring to Figure 2 and Figure 3 , the non-metallic sealing element 120 is sleeved on the outer peripheral wall of the first end 111 of the valve needle 110, and the riveting portion 113 is used for riveting with the non-metallic sealing element 120, thereby strengthening the connection between the non-metallic sealing element 120 and the valve needle 110 and ensuring that the non-metallic sealing element 120 does 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 sealing element 120 and the valve needle 110 are fixedly connected through the riveting portion 113, which can greatly reduce the processing precision requirements of the non-metallic sealing element 120, is lower in cost, and is more reliable in structure. In addition, the riveting portion 113 is riveted with the non-metallic sealing element 120, which can more conveniently test the coaxiality and roundness of the non-metallic sealing element 120 and the valve needle 110, thereby facilitating the improvement of the coaxiality and roundness of the valve needle assembly 100.

[0040] In an embodiment, the outer peripheral wall of the first end 111 is formed with a mounting groove 114, and the riveting portion 113 is used for riveting the sealing element in the mounting groove 114.

[0041] Referring to Figure 3 and Figure 4 , the outer peripheral wall of the first end 111 is provided with a mounting groove 114, and the mounting groove 114 extends along the circumference of the valve needle 110 and is annular. The mounting groove 114 is used to better accommodate and fix the non-metallic sealing element 120, thereby ensuring that the connection between the non-metallic sealing element 120 and the valve needle 110 is firm and reliable, and effectively preventing loosening or falling off due to vibration or pressure changes.

[0042] By forming the mounting groove 114 on the outer peripheral wall of the first end 111, a suitable mounting position can be provided for the non-metallic sealing element 120, so that the non-metallic sealing element 120 can be accurately positioned and aligned with the valve needle 110, thereby ensuring that the non-metallic sealing element 120 does not deviate or loosen during operation. At the same time, during the riveting of the non-metallic sealing element 120 in the mounting groove 114 by the riveting portion 113, the groove side wall away from the first end 111 of the mounting groove 114 abuts against the non-metallic sealing element 120, thereby facilitating the riveting operation of the riveting portion 113.

[0043] In addition, during the installation process, whether the non-metallic seal 120 meets the standard can be determined by observing whether the peripheral wall of the non-metallic seal 120 is flush with the outer peripheral wall of the valve needle 110, so as to ensure the consistency of the cooperation between the valve needle assembly 100 and the valve port 200, thereby improving the product quality.

[0044] In another embodiment, the non-metallic seal 120 can also be directly sleeved on the outer peripheral wall of the first end 111 of the valve needle 110, and the peripheral wall of the non-metallic seal 120 protrudes from the outer peripheral wall of the valve needle 110. In this way, the installation groove 114 for installing the non-metallic seal 120 is not required, and the machining of the valve needle 110 is simpler.

[0045] In an embodiment, the valve needle assembly 100 further comprises a gasket 130, which is arranged between the non-metallic seal 120 and the riveting portion 113 and connects the non-metallic seal 120 and the riveting portion 113.

[0046] Referring to Figure 3 , the valve needle 110 and the non-metallic seal 120 are riveted through the riveting portion 113. In order to reduce the deformation of the non-metallic seal 120 during the riveting process, the gasket 130 can be arranged at the position where the riveting portion 113 and the non-metallic seal 120 are riveted, so as to buffer and disperse the riveting force, thereby preventing the deformation of the non-metallic seal 120 during the riveting process.

[0047] In an embodiment, the non-metallic seal 120 has a mounting hole 121 through which the valve needle 110 passes, and the inner wall surface of the end away from the second end 112 of the mounting hole 121 is formed with a notched groove 122, and the gasket 130 is arranged in the notched groove 122, and the riveting portion 113 is riveted to the gasket 130 corresponding to the notched groove 122.

[0048] Referring to Figure 3 and Figure 5 , the non-metallic seal 120 has a mounting hole 121 through which the valve needle 110 passes, 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. The inner wall surface of the end away from the second end 112 of the mounting hole 121 is formed with a notched groove 122 for accommodating the gasket 130. The riveting portion 113 is riveted to the gasket 130 corresponding to the notched groove 122, that is, there is no direct contact between the riveting portion 113 and the non-metallic seal 120. The riveting portion 113 is riveted and fixed to the non-metallic seal 120 through the gasket 130, so as to realize the fixed connection between the riveting portion 113 and the non-metallic seal 120, and at the same time, the riveting force of the riveting portion 113 on the non-metallic seal 120 can be reduced through the gasket 130, thereby preventing the deformation of the non-metallic seal 120.

[0049] By forming a notch groove 122 on the inner wall surface of the mounting hole 121 at one end 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 loose during operation. At the same time, during the riveting of the non-metallic sealing element 120 to the mounting groove 114 at the riveting portion 113, the groove side wall of the notch groove 122 away from the first end 111 abuts against the gasket 130, facilitating the riveting operation of the riveting portion 113.

[0050] In another embodiment, the notch groove 122 can also not be provided, and the gasket 130 is directly clamped between the riveting portion 113 and the non-metallic sealing element 120, and the processing of the non-metallic sealing element 120 is simpler.

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

[0052] The gasket 130 is made of metal and formed by stamping, which can achieve precise control of the shape and size of the gasket 130, ensuring its fit with the notch groove 122. The stamping process is simple and efficient, allowing for mass production of gaskets 130 that meet the specifications, thereby meeting production needs and ensuring stable product quality, while also reducing processing and production costs. In addition, stamped parts generally have good strength and wear resistance, which can extend the service life of the gasket 130.

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

[0054] Please refer to Figure 5 On the one hand, during assembly of the valve needle 110 and the non-metallic sealing element 120, the first end 111 of the valve needle 110 can be easily passed through the mounting hole 121, thereby reducing the difficulty of assembly of the valve needle 110 and the non-metallic sealing element 120 and improving installation efficiency and convenience. On the other hand, the chamfer 123 can remove burrs from the port 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 assembly.

[0055] In an embodiment, the non-metallic sealing element 120 and the valve needle 110 are integrally molded by injection molding.

[0056] The non-metallic sealing element 120 and the valve needle 110 are formed by secondary injection molding to achieve a tight and seamless connection between the two, avoiding the seams or gaps that can occur during traditional assembly, thereby improving the stability of the connection between the non-metallic sealing element 120 and the valve needle 110. Moreover, the injection molding process can also achieve precise molding of the non-metallic sealing element 120 and the valve needle 110, ensuring the accuracy and consistency of their shape and size, thereby improving the quality stability and production efficiency of the product.

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

[0058] The non-metallic sealing member 120 achieves soft sealing with the inner wall surface of the valve port 200 by slight deformation. The polytetrafluoroethylene has good elasticity and recovery, and can quickly recover to the original state under pressure, maintaining the sealing performance and being not easy to be permanently deformed.

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

[0060] The present application also proposes an electronic expansion valve 10, which comprises the valve needle assembly 100, the specific structure of which is referred to the above embodiments. Since the electronic expansion valve 10 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0061] The electronic expansion valve 10 proposed by the present application can be applied to an air conditioning system, and the fluid medium flowing through the electronic expansion valve 10 is refrigerant used for heat exchange in the air conditioning system. At this time, the electronic expansion valve 10 is installed at the evaporator inlet of the air conditioning system, and the electronic expansion valve 10 is used as a dividing element between the high-pressure side and the low-pressure side of the air conditioning system, throttles and depressurizes the high-pressure liquid refrigerant from the liquid receiver and other devices, thereby adjusting and controlling the dose of the liquid refrigerant entering the evaporator, so that the dose of the liquid refrigerant can adapt to the requirements of 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 in addition to refrigerant, as long as the electronic expansion valve 10 can achieve throttling and depressurization of the fluid medium. No specific limitation is made.

[0062] In an embodiment, the non-metallic sealing member 120 is provided with a rounded corner 124 at the outer periphery of one end close to the valve port 200, the inner wall surface of the valve port 200 is a tapered surface 210, and the tapered surface 210 is tapered away from the valve needle assembly 100. When the valve port 200 is closed, the rounded corner 124 of the non-metallic sealing member 120 abuts against the tapered surface 210.

[0063] Please refer to Figure 1 and Figure 5By applying certain regular electric pulse to the coil, the rotation of the rotor of the electronic expansion valve 10 is excited, thereby driving the valve rod of the electronic expansion valve 10 to rotate and move up and down in the nut assembly of the electronic expansion valve 10, and further driving the valve needle assembly 100 to open and close the valve port 200, so as to realize the opening and closing 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 rounded corner 124 of the non-metallic sealing element 120 and forms a line seal, so as to ensure the sealing effect of the non-metallic sealing element 120 and the valve port 200. At the same time, the rounded corner 124 of the non-metallic sealing element 120 is arranged, which helps to reduce the friction between the non-metallic sealing element 120 and the valve port 200, improve the wear resistance of the non-metallic sealing element 120, and ensure the good fit between the non-metallic sealing element 120 and the valve port 200.

[0064] The application further provides a refrigeration device comprising the electronic expansion valve 10, the specific structure of which is referred to the above-mentioned embodiments. Since all the technical solutions of the above-mentioned embodiments are adopted in the refrigeration device, all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are at least possessed by the refrigeration device, which will not be repeated here.

[0065] The above-mentioned is only an exemplary embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made under the technical concept of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A valve needle assembly for use in an electronic expansion valve, characterized in that The valve needle assembly comprises: a valve needle having opposite first and second ends, the second end being configured to connect a rotor of the electronic expansion valve; a non-metallic seal connected to the first end, the non-metallic seal being configured to soft seal a valve port of the electronic expansion valve.

2. The valve needle assembly of claim 1, wherein The non-metallic seal is sleeved on an outer peripheral wall of the first end, the first end is provided with a riveting portion, and the riveting portion is riveted with the non-metallic seal.

3. The valve needle assembly of claim 2, wherein, An outer peripheral wall of the first end is formed with a mounting groove, and the riveting portion is configured to rivet the seal in the mounting groove.

4. A valve needle assembly as claimed in claim 2 or 3, characterized in that The valve needle assembly further comprises a gasket, which is arranged between the non-metallic seal and the riveting portion and connects the non-metallic seal and the riveting portion.

5. The valve needle assembly of claim 4, wherein, The non-metallic seal has a mounting hole through which the valve needle passes, an inner wall surface of one end of the mounting hole away from the second end is formed with a notched groove, the gasket is arranged in the notched groove, and the riveting portion is riveted with the gasket corresponding to the notched groove.

6. The valve needle assembly of claim 5, wherein, The gasket is a stamped part.

7. The valve needle assembly of claim 5, wherein, An end of the mounting hole close to the second end is provided with a chamfer.

8. The valve needle assembly of claim 1, wherein, The non-metallic seal is integrally formed with the valve needle by injection molding.

9. The valve needle assembly of claim 1, wherein, The non-metallic seal is made of polytetrafluoroethylene.

10. An electronic expansion valve characterized by The valve needle assembly as claimed in any one of claims 1 to 9.

11. The electronic expansion valve of claim 10, wherein An outer peripheral edge of one end of the non-metallic seal close to the valve port is chamfered, an inner wall surface of the valve port is a tapered surface, the tapered surface is tapered in a direction away from the valve needle assembly, and when the valve port is closed, the chamfered corner of the non-metallic seal abuts against the tapered surface.

12. A refrigeration appliance characterized in that, The electronic expansion valve as claimed in claim 10 or 11.

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