Valve needle assembly and electronic expansion valve

Abstract

The embodiment of the utility model provides a valve needle assembly and an electronic expansion valve, and relates to the field of electronic control valves. The valve needle assembly comprises a valve needle body and a sealing piece. The valve needle body is provided with a sealing end, and an embedded structure is arranged on the side wall and / or the bottom wall of the sealing end. The sealing piece is formed at the sealing end, connected with the embedded structure and used for being connected with the valve seat in an abutting mode to achieve sealing. Through the embedded connection of the sealing piece and the embedded structure, the bonding strength of the sealing piece and the sealing end of the valve seat can be enhanced, and therefore the problem that the sealing piece falls off can be avoided. The sealing part is directly formed at the sealing end, so that the sealing part and the sealing end can be bonded together, the bonding strength of the sealing part and the sealing end can be enhanced, and forming of the sealing part is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric valve technical field, specifically, a valve needle subassembly and electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve as one of indispensable components in air conditioning system. With the stability and control precision of air conditioning system are put forward higher request, this also promotes the internal leakage control of electronic expansion valve has more strict standard.

[0003] To solve the problem of internal leakage of electronic expansion valve, the method commonly used in the prior art is to design the end of the valve needle as a cone, and match the corresponding conical valve seat. When the valve is closed, the valve needle is inserted into the valve seat, and the sealing is realized by the close fit of the two conical surfaces. However, the conical sealing method is prone to loose sealing, so the conical surface usually needs to be finely ground to meet the sealing requirements. This process not only requires high processing equipment and technology, increases the processing cost, but also the conical surface is prone to wear in the long-term use.

[0004] Another prior art solution is to provide a sealing ring at the end of the valve needle. However, since the sealing ring is installed at the end of the valve needle, it is easy to fall off during frequent movement of the valve needle, resulting in sealing failure and unable to meet the actual application requirements.

[0005] Therefore, how to provide a reliable sealing structure of electronic expansion valve has become a technical problem to be solved in the field. UTILITY MODEL CONTENTS

[0006] The purpose of the utility model includes providing a valve needle assembly and electronic expansion valve, which can better set a sealing structure on the valve needle, thereby improving the problem of sealing element falling off.

[0007] The embodiment of the utility model can be implemented as follows:

[0008] In a first aspect, the utility model provides a valve needle assembly, which comprises a valve needle body and a sealing element.

[0009] The valve needle body has a sealing end, and the side wall and / or bottom wall of the sealing end are provided with an embedded structure.

[0010] The sealing element is formed on the sealing end and connected with the embedded structure, and the sealing element is used to abut against the valve seat to realize sealing.

[0011] In an optional embodiment, the embedded structure comprises a first embedded groove provided on the side wall of the sealing end and a second embedded groove provided on the bottom wall of the sealing end, and the sealing element is partially embedded in the first embedded groove and the second embedded groove.

[0012] In an optional embodiment, at least one of the first and second fitting grooves is a ring groove.

[0013] In an optional embodiment, the fitting structure comprises a first boss provided on the sealing end sidewall and a second boss provided on the sealing end bottom wall, and the sealing member is wrapped around the outer periphery of the first boss and the second boss.

[0014] In an optional embodiment, the first and second fitting grooves are communicated so that the portions of the sealing member extending into the first and second fitting grooves are connected to each other.

[0015] In an optional embodiment, the first fitting groove is a first side hole provided on the sealing end sidewall, and the second fitting groove is a second side hole provided on the sealing end bottom wall, and the first and second side holes are communicated.

[0016] In an optional embodiment, an end portion of the sealing end and located at the outer periphery of the sealing end is provided with a first receiving ring groove;

[0017] The first fitting groove is provided on the sidewall of the receiving ring groove, and the top wall of the sealing member is connected to the top wall of the first receiving ring groove.

[0018] In an optional embodiment, an end portion of the sealing end and located at the outer periphery of the sealing end is provided with a second receiving ring groove;

[0019] The depth of the first receiving ring groove is greater than the depth of the second receiving ring groove, and the inner diameter of the second receiving ring groove is smaller than the inner diameter of the first receiving ring groove.

[0020] The second fitting groove is provided on the top wall of the second receiving ring groove.

[0021] Part of the sealing member is accommodated in the second receiving ring groove and connected to the sidewall and top wall of the second receiving ring groove.

[0022] In an optional embodiment, the sealing member is made of plastic material.

[0023] In a second aspect, the utility model provides a kind of electronic expansion valve, including valve body, drive mechanism and the valve needle subassembly of any one of the preceding embodiments;

[0024] The valve body is provided with a first flow passage, a second flow passage and a valve seat, the valve needle body and the drive mechanism are installed on the valve body, and the sealing end corresponds to the valve seat.

[0025] When the driving mechanism moves the valve needle body to make the seal abut against the valve seat, the valve needle can block the connection between the first flow port and the second flow port;

[0026] When the driving mechanism moves the valve needle body to disengage the seal from the valve seat, the valve needle can connect the first flow port and the second flow port.

[0027] The beneficial effects of the valve needle and electronic expansion valve provided in this embodiment of the invention include:

[0028] This application provides an interlocking structure at the sealing end and / or bottom wall of the valve needle body, and directly molds the seal onto the sealing end, connecting the seal to the interlocking structure. This interlocking connection enhances the bonding strength between the seal and the valve seat, thus preventing seal detachment. Furthermore, directly molding the seal onto the sealing end allows for adhesion between the two, further strengthening the bond and facilitating seal molding. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of a valve needle assembly provided in this embodiment;

[0031] Figure 2 for Figure 1 A schematic diagram of the valve needle body of the valve needle assembly shown;

[0032] Figure 3 A cross-sectional view of another valve needle assembly provided in this embodiment;

[0033] Figure 4 for Figure 3 The diagram shows the structure of the valve needle body of the valve needle assembly.

[0034] Icons: 100-Valve needle assembly; 110-Valve needle body; 111-Sealing end; 112-Matching structure; 113-First mating groove; 114-Second mating groove; 115-First side hole; 116-Second side hole; 117-First receiving annular groove; 118-Second receiving annular groove; 130-Seal. Detailed Implementation

[0035] To solve the problem of internal leakage of electronic expansion valve, the method commonly used in the prior art is to design the end of the valve needle as a cone and match it with a corresponding conical valve seat. When the valve is closed, the valve needle is inserted into the valve seat and relies on the close fit of the two conical surfaces to achieve sealing. However, the conical surface sealing method is prone to sealing failure, so the conical surface usually needs to be finely ground to meet the sealing requirements. This process not only requires very high processing equipment and technology, increasing the processing cost, but also the conical surface is prone to wear during long-term use. Another prior art solution is to provide a sealing ring at the end of the valve needle. However, since the sealing ring is installed at the end of the valve needle, it is easy to fall off during frequent movement of the valve needle, resulting in sealing failure and failing to meet the requirements of actual application. How to provide a reliable sealing structure for an electronic expansion valve has become a technical problem to be solved in the field.

[0036] To solve the above problems, the utility model provides a valve needle and electronic expansion valve, which can better set a sealing structure on the valve needle, thereby improving the problem of falling of the sealing element 130.

[0037] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0039] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the utility model, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0041] In addition, if the terms "first", "second" and the like are used herein, they are merely used to distinguish one entity from another, and do not imply or suggest a relative importance.

[0042] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0043] The overall structure, working principle and technical effects of the valve needle assembly and the electronic expansion valve provided by the present application will be described in detail below by means of embodiments and in combination with the drawings.

[0044] Please refer to Figure 1 , the electronic expansion valve comprises a valve body, a driving mechanism and a valve needle assembly 100. The valve body is provided with a first flow passage, a second flow passage and a valve seat. The valve needle assembly 100 and the driving mechanism are installed in the valve body. The driving mechanism can drive the valve needle assembly to move to adjust the opening degree between the first flow passage and the second flow passage, thereby controlling the flow of refrigerant.

[0045] Please refer to Figures 1 to 4 In the present embodiment, the valve needle assembly 100 comprises a valve needle body 110 and a sealing member 130. The valve needle body 110 has a sealing end 111, and the side wall and / or bottom wall of the sealing end 111 is provided with a fitting structure 112. The sealing member 130 is formed on the sealing end 111 and connected with the fitting structure 112, and the sealing member 130 is used to abut against the valve seat to achieve sealing. When the driving mechanism drives the valve needle body 110 to move so that the sealing member 130 abuts against the valve seat, the valve needle body 110 can block the communication between the first flow passage and the second flow passage. When the driving mechanism drives the valve needle body 110 to move so that the sealing member 130 is removed from abutting against the valve seat, the valve needle body 110 can make the first flow passage and the second flow passage communicate.

[0046] In the present embodiment, the fitting structure 112 is provided on the sealing end 111 and / or the bottom wall of the valve needle body 110, and the sealing member 130 is directly formed on the sealing end 111, so that the sealing member 130 is connected with the fitting structure 112. Through the fitting connection of the sealing member 130 and the fitting structure 112, the bonding strength of the sealing member 130 and the sealing end 111 of the valve seat can be enhanced, so that the problem of the sealing member 130 falling off can be avoided. Directly forming the sealing member 130 on the sealing end 111 can make the two adhere together, and also enhance the bonding strength of the two, and facilitate the molding of the sealing member 130.

[0047] It should be noted that the valve needle assembly 100 can be a single valve needle or a double valve needle assembly 100 in which the large valve needle and the small valve needle are nested together. When the valve needle assembly 100 is a double valve needle assembly 100, the sealing member 130 is formed on the large valve needle.

[0048] In the embodiment, the fitting structure 112 can be a groove or a boss. When the sealing member 130 is formed, the part of the sealing member 130 can be filled in the groove or wrapped outside the boss, forming the fitting connection structure, so as to enhance the bonding strength of the two.

[0049] In the embodiment, the sealing member 130 is made of plastic material. The forming mode of the sealing member 130 on the sealing end 111 can adopt die sealing or injection molding.

[0050] Please refer to Figures 1 to 4 In the embodiment, the fitting structure 112 includes a first fitting groove 113 arranged on the side wall of the sealing end 111 and a second fitting groove 114 arranged on the bottom wall of the sealing end 111, and the sealing member 130 is partially fitted in the first fitting groove 113 and the second fitting groove 114.

[0051] In the embodiment, the first fitting groove 113 is arranged on the side wall of the sealing end 111, and the second fitting groove 114 is arranged on the bottom wall of the sealing end 111, so as to better enhance the bonding strength between the two.

[0052] In an embodiment of the application, the first fitting groove 113 and the second fitting groove 114 are annular grooves.

[0053] Arranging the first fitting groove 113 and the second fitting groove 114 as annular grooves facilitates processing, reduces the weight of the valve needle, and improves the sensitivity of the valve needle.

[0054] Of course, in some embodiments of the application, one of the first fitting groove 113 and the second fitting groove 114 is an annular groove, and the other is a hole.

[0055] Please refer to Figure 2 and Figure 3 Further, the first fitting groove 113 and the second fitting groove 114 can be communicated, so that the parts of the sealing member 130 extending into the first fitting groove 113 and the second fitting groove 114 are connected to each other.

[0056] In the embodiment, the first fitting groove 113 and the second fitting groove 114 are communicated, so that the part of the sealing member 130 extending into the first fitting groove 113 and the part of the sealing member 130 extending into the second fitting groove 114 can be connected, thereby wrapping part of the valve needle inside, so as to have higher bonding strength between the two.

[0057] Further, the first fitting groove 113 is a first side hole 115 arranged on the side wall of the sealing end 111, the second fitting groove 114 is a second side hole 116 arranged on the bottom wall of the sealing end 111, and the first side hole 115 and the second side hole 116 are communicated.

[0058] In another embodiment, one of the first and second fitting grooves 113 and 114 is a ring groove, and the other is a hole, and the hole is communicated with the ring groove.

[0059] Of course, the first and second fitting grooves 113 and 114 can also be ring grooves, but a communication hole is formed in the wall of the ring groove, and the two are communicated by the communication hole.

[0060] In some other embodiments of the present application, the fitting structure 112 includes a first boss arranged on the side wall of the sealing end 111 and a second boss arranged on the bottom wall of the sealing end 111, and the sealing member 130 is partially wrapped around the outer periphery of the first and second bosses.

[0061] Please refer to Figures 1 to 4 In the present embodiment, a first accommodating ring groove 117 is arranged at the end of the sealing end 111 and at the outer periphery of the sealing end 111. The first fitting groove 113 is arranged on the side wall of the accommodating ring groove, and the top wall of the sealing member 130 is connected to the top wall of the first accommodating ring groove 117.

[0062] The first accommodating ring groove 117 is arranged to accommodate the sealing member 130 in the present embodiment, which can avoid the sealing member 130 protruding from the side wall of the valve needle body 110, and can facilitate injection molding and increase the bonding strength.

[0063] In the present embodiment, a second accommodating ring groove 118 is arranged at the end of the sealing end 111 and at the outer periphery of the sealing end 111. The depth of the first accommodating ring groove 117 is greater than the depth of the second accommodating ring groove 118, and the inner diameter of the second accommodating ring groove 118 is smaller than the inner diameter of the first accommodating ring groove 117. The second fitting groove 114 is arranged on the top wall of the second accommodating ring groove 118. Part of the sealing member 130 is accommodated in the second accommodating ring groove 118 and connected to the side wall and the top wall of the second accommodating ring groove 118.

[0064] The second accommodating ring groove 118 is arranged in the present embodiment, which can avoid the sealing member 130 protruding from the bottom surface of the sealing end 111, and can facilitate injection molding and increase the bonding strength.

[0065] In summary, the fitting structure 112 is arranged on the sealing end 111 and / or the bottom wall of the valve needle body 110 in the present embodiment, and the sealing member 130 is directly formed on the sealing end 111, so that the sealing member 130 is connected to the fitting structure 112. Through the fitting connection between the sealing member 130 and the fitting structure 112, the bonding strength between the sealing member 130 and the sealing end 111 of the valve seat can be increased, thereby avoiding the problem of the sealing member 130 falling off. Directly forming the sealing member 130 on the sealing end 111 can bond the two together, which can also increase the bonding strength and facilitate the formation of the sealing member 130.

[0066] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A valve needle assembly, characterized in that The valve needle assembly comprises a valve needle body (110) and a sealing member (130); The valve needle body (110) has a sealing end (111), and a side wall and / or a bottom wall of the sealing end (111) are provided with an embedded structure (112); The sealing member (130) is formed on the sealing end (111) and connected with the embedded structure (112), and is used for sealing with a valve seat.

2. The valve needle assembly of claim 1, wherein The embedded structure (112) comprises a first embedded groove (113) provided on the side wall of the sealing end (111) and a second embedded groove (114) provided on the bottom wall of the sealing end (111), and the sealing member (130) is partially embedded in the first embedded groove (113) and the second embedded groove (114).

3. The valve needle assembly of claim 2, wherein, At least one of the first embedded groove (113) and the second embedded groove (114) is an annular groove.

4. The valve needle assembly of claim 1, wherein The embedded structure (112) comprises a first boss provided on the side wall of the sealing end (111) and a second boss provided on the bottom wall of the sealing end (111), and the sealing member (130) is partially wrapped around the outer periphery of the first boss and the second boss.

5. The valve needle assembly of claim 2, wherein The first embedded groove (113) and the second embedded groove (114) are communicated, so that the parts of the sealing member (130) extending to the first embedded groove (113) and the second embedded groove (114) are connected with each other.

6. The valve needle assembly of claim 5, wherein, The first embedded groove (113) is a first side hole (115) provided on the side wall of the sealing end (111), and the second embedded groove (114) is a second side hole (116) provided on the bottom wall of the sealing end (111), and the first side hole (115) and the second side hole (116) are communicated.

7. The valve needle assembly of claim 2, wherein An end portion of the sealing end (111) and an outer periphery of the sealing end (111) are provided with a first accommodating ring groove (117); The first embedded groove (113) is provided on the side wall of the accommodating ring groove, and a top wall of the sealing member (130) is connected with a top wall of the first accommodating ring groove (117).

8. The valve needle assembly of claim 7, wherein, An end portion of the sealing end (111) and an outer periphery of the sealing end (111) are provided with a second accommodating ring groove (118); The depth of the first accommodating ring groove (117) is greater than the depth of the second accommodating ring groove (118), and the inner diameter of the second accommodating ring groove (118) is smaller than the inner diameter of the first accommodating ring groove (117); The second embedded groove (114) is provided on the top wall of the second accommodating ring groove (118); Part of the sealing member (130) is accommodated in the second accommodating ring groove (118) and connected with the side wall and the top wall of the second accommodating ring groove (118).

9. The valve needle assembly of claim 1, wherein, The sealing member (130) is made of plastic material.

10. An electronic expansion valve characterized by The valve needle assembly comprises a valve body, a driving mechanism and the valve needle assembly according to any one of claims 1-9; The valve body is provided with a first flow passage, a second flow passage and a valve seat, the valve needle body (110) and the driving mechanism are mounted on the valve body, and the sealing end (111) corresponds to the valve seat; In a state where the driving mechanism drives the valve needle body (110) to move so that the sealing member (130) abuts against the valve seat, the valve needle body (110) can block the first flow passage and the second flow passage from communicating; In a state where the driving mechanism drives the valve needle body (110) to move so that the sealing member (130) is removed from abutting against the valve seat, the valve needle body (110) can make the first flow passage and the second flow passage communicate.

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