Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve body, a coil assembly and a sealing ring, the coil assembly comprises a shell and a coil, the shell is provided with a containing cavity, one axial side of the containing cavity is provided with an opening, the coil surrounds the peripheral side of the containing cavity, part of the valve body is movably installed in the containing cavity, and the sealing ring is arranged on the valve body. The side wall, close to the opening, of the containing cavity is provided with a sealing groove, the sealing ring is installed in the sealing groove and used for sealing an assembling gap between the valve body and the coil assembly, the sealing ring comprises a body part and a deformation part, the radial inner side of the deformation part is connected with the body part, and the radial outer side of the deformation part inclines towards the opening. According to the electronic expansion valve, when the valve body 1 moves towards the containing cavity 213 from the opening, gas in the containing cavity can be exhausted out of the containing cavity, so that the valve body can be well assembled in the containing cavity, the assembling difficulty of the valve body can be reduced, and the assembling efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration control technology, and in particular to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves are mainly used in variable frequency air conditioning systems to regulate refrigerant flow and keep the refrigerant circuit system in optimal condition. Currently, existing electronic expansion valves consist of a valve body for flow regulation and a coil for providing driving force, with the valve body and coil axially connected.

[0003] In the existing electronic expansion valve coil structure, when the valve body is inserted into the coil, the air between the top of the valve body and the coil cannot be expelled. The continuously compressed air will create resistance to the insertion of the valve body, thus affecting the assembly of the valve body. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide an electronic expansion valve whose valve body can be well assembled.

[0005] The electronic expansion valve according to an embodiment of the present invention includes: a valve body, a coil assembly, and a sealing ring. The coil assembly includes a housing and a coil. The housing has a receiving cavity with an opening on one axial side. The coil surrounds the outer periphery of the receiving cavity. A portion of the valve body is movably mounted in the receiving cavity. The side wall of the receiving cavity adjacent to the opening has a sealing groove. The sealing ring is annular and is installed in the sealing groove. The sealing ring seals between the valve body and the coil assembly. The sealing ring includes a body portion and a deformable portion. The radially inner side of the deformable portion is connected to the body portion, and the radially outer side of the deformable portion is inclined toward the opening.

[0006] According to an embodiment of the present invention, the electronic expansion valve includes a sealing ring comprising a body and a deformable portion. The radially inner side of the deformable portion is connected to the body, and the radially outer side of the deformable portion is inclined toward the opening. The sealing ring not only seals well between the valve body and the coil assembly, but also, because the radially outer side of the deformable portion is inclined toward the opening, when the air pressure in the receiving cavity is greater than the air pressure of the external environment, the gas can better squeeze the deformable portion along the inclined direction of the deformable portion, causing the deformable portion to deform toward the direction closer to the body. After deformation, the deformable portion can create an airflow channel between the sealing ring and the sealing groove. The gas in the receiving cavity can be discharged from the receiving cavity through the airflow channel, so that the valve body can be better assembled into the receiving cavity, which can reduce the assembly difficulty of the valve body and improve the assembly efficiency.

[0007] In addition, the electronic expansion valve according to this utility model may also have the following additional technical features:

[0008] In some embodiments of this utility model, the sealing ring is interference-fitted between the valve body and the coil assembly in the radial direction, and the sealing ring is clearance-fitted within the sealing groove in the axial direction.

[0009] In some embodiments of this utility model, the housing includes a housing body and a fixing bracket. The housing body has the receiving cavity, and the side wall of the housing body near the opening has a recess. The fixing bracket is fixed at the opening and defines the sealing groove with the recess.

[0010] In some embodiments of this utility model, the fixed bracket includes a bracket plate, which is an annular plate and is radially spaced from the valve body.

[0011] In some embodiments of this utility model, the fixing bracket is riveted to the shell body.

[0012] In some embodiments of this utility model, the cross-section of the main body is rectangular, and the radial dimension of the main body is greater than the axial dimension of the main body.

[0013] In some embodiments of this utility model, the corners of the main body are rounded.

[0014] In some embodiments of this utility model, the body portion and the deformable portion have a circular arc transition.

[0015] In some embodiments of this utility model, the deformed portion extends with equal thickness in the direction away from the body portion, or at least a portion of the deformed portion gradually increases in thickness.

[0016] In some embodiments of this utility model, the end of the deformable portion away from the body portion is rounded.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a cross-sectional view of an electronic expansion valve according to an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A magnified view of region A in the middle.

[0021] Figure 3 This is a schematic diagram of the sealing ring of the electronic expansion valve according to an embodiment of the present invention.

[0022] Figure label:

[0023] 100. Electronic expansion valve;

[0024] 1. Valve body;

[0025] 2. Coil assembly; 21. Housing; 211. Housing body; 212. Fixing bracket; 213. Receiving cavity; 214. Sealing groove; 22. Coil;

[0026] 3. Sealing ring; 31. Body part; 32. Deformable part. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] The following is for reference. Figures 1-3 The electronic expansion valve 100 according to an embodiment of the present invention is described.

[0029] like Figures 1-3 As shown, the electronic expansion valve 100 according to an embodiment of the present invention includes a valve body 1, a coil assembly 2, and a sealing ring 3. The coil assembly 2 includes a housing 21 and a coil 22. The housing 21 has a receiving cavity 213 with an opening on one axial side. The coil 22 surrounds the outer periphery of the receiving cavity 213. A portion of the valve body 1 is movably mounted in the receiving cavity 213. The side wall of the receiving cavity 213 near the opening has a sealing groove 214. The sealing ring 3 is mounted in the sealing groove 214 and seals between the valve body 1 and the coil assembly 2. The sealing ring 3 includes a body portion 31 and a deformable portion 32. The radially inner side of the deformable portion 32 is connected to the body portion 31, and the radially outer side of the deformable portion 32 is inclined toward the opening.

[0030] In other words, the sealing ring 3 includes a body part 31 and a deformable part 32 that is radially outward and inclined toward the opening direction. When the valve body 1 moves toward the receiving cavity 213, the deformable part 32 deforms under pressure, which can better seal between the valve body 1 and the coil assembly 2. Furthermore, the inclined deformable portion 32 can adaptively adjust the sealing state according to pressure changes. Specifically, when the valve body 1 moves from the opening toward the receiving cavity 213, the air pressure in the receiving cavity 213 will gradually increase due to the sealing effect of the sealing ring 3. Under the action of the increased air pressure, the gas can squeeze the deformable portion 32 along the side wall of the sealing groove 214, causing the deformable portion 32 to deform. Since the radial outer side of the deformable portion 32 is inclined toward the opening, the gas can squeeze the deformable portion 32 better along the inclined direction of the deformable portion 32, causing the deformable portion 32 to deform toward the direction closer to the main body portion 31. After the deformable portion 32 is deformed, an airflow channel can be generated between the sealing ring 3 and the sealing groove 214. The gas in the receiving cavity 213 can be discharged from the receiving cavity 213 through the airflow channel. Thus, the valve body 1 can be better assembled into the receiving cavity 213, which can reduce the assembly difficulty of the valve body 1 and improve the assembly efficiency.

[0031] Furthermore, as the gas in the receiving cavity 213 is gradually discharged, the deformable part 32 gradually recovers its deformation, thereby allowing the sealing ring 3 to seal well between the valve body 1 and the coil assembly 2. This prevents moisture or water from the external environment from easily penetrating between the valve body 1 and the coil assembly 2, effectively improving the reliability of the electronic expansion valve 100. Specifically, when external gas presses against the deformable part 32 along the side wall of the sealing groove 214, because the radially outer side of the deformable part 32 is inclined towards the opening, the external gas can cause the deformable part 32 to deform away from the main body 31. This allows the sealing ring 3 to seal more firmly between the valve body 1 and the coil assembly 2, reducing the risk of moisture or water from the external environment penetrating the inside of the coil 22 and causing a decrease in the electrical insulation performance of the coil 22. This results in the electronic expansion valve 100 having higher safety and reliability.

[0032] Therefore, according to the embodiment of the present invention, the electronic expansion valve 100 has a sealing ring 3 including a body part 31 and a deformable part 32. The radial inner side of the deformable part 32 is connected to the body part 31, and the radial outer side of the deformable part 32 is inclined towards the opening. The sealing ring 3 can not only seal well between the valve body 1 and the coil assembly 2, but also, because the radial outer side of the deformable part 32 is inclined towards the opening, when the air pressure in the receiving cavity 213 is greater than the air pressure of the external environment, the gas can better squeeze the deformable part 32 along the inclined direction of the deformable part 32, so that the deformable part 32 deforms towards the direction closer to the body part 31. After the deformable part 32 is deformed, an airflow channel can be generated between the sealing ring 3 and the sealing groove 214. The gas in the receiving cavity 213 can be discharged from the receiving cavity 213 through the airflow channel, so that the valve body 1 can be better assembled into the receiving cavity 213, which can reduce the assembly difficulty of the valve body 1 and improve the assembly efficiency.

[0033] In some embodiments of this utility model, such as Figure 2 As shown, in the radial direction, the sealing ring 3 is interference-fitted between the valve body 1 and the coil assembly 2, and in the axial direction, the sealing ring 3 is clearance-fitted within the sealing groove 214.

[0034] In other words, in the radial direction, the sealing ring 3 is interference-fitted between the valve body 1 and the coil assembly 2, which can effectively seal the valve body 1 and the coil assembly 2, reducing the risk of moisture or water from the external environment penetrating into the coil 22 and causing a decrease in the electrical insulation performance of the coil 22. This makes the electronic expansion valve 100 have high safety and reliability. Furthermore, in the axial direction, the sealing ring 3 is gap-fitted in the sealing groove 214, which allows the gas in the receiving cavity 213 to enter the groove wall of the sealing groove 214 and the sealing ring 3, thereby effectively squeezing the deformable part 32 along the inclined direction of the deformable part 32, causing the deformable part 32 to deform towards the direction closer to the main body 31.

[0035] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the housing 21 includes a housing body 211 and a fixing bracket 212. The housing body 211 has a receiving cavity 213. The side wall of the housing body 211 near the opening has a recess. The fixing bracket 212 is fixed at the opening and defines a sealing groove 214 with the recess.

[0036] In other words, the sealing groove 214 is constructed by the assembly between the shell body 211 and the fixed bracket 212. In this way, the assembly difficulty of the sealing ring 3 can be reduced, and the sealing ring 3 can be easily disassembled when it needs to be replaced or repaired.

[0037] Furthermore, the recess is located near the opening, which allows for better machining of the recess on the shell body 211, reducing machining difficulty and thus production costs.

[0038] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fixed bracket 212 includes a bracket plate, which is an annular plate and is radially spaced from the valve body 1.

[0039] In other words, the annular plate has a simple structure. By making the annular plate a support plate, it can better cooperate with the recess to form a sealing groove 214. By making the support plate and the valve body 1 radially spaced apart, the interference between the valve body 1 and the support plate can be reduced better when the valve body 1 moves axially.

[0040] In some embodiments of this utility model, the fixing bracket 212 is riveted to the shell body 211.

[0041] For example, the fixed bracket 212 includes a bracket plate, which is an annular plate. The bracket plate is riveted to the shell body 211. The riveting fixing method is simple, convenient and relatively firm, which can reduce the assembly difficulty and improve the assembly efficiency.

[0042] For example, the fixing bracket 212 can be fixed to the shell body 211 by hot riveting. Hot riveting is a method of connection that utilizes the property of thermoplastic materials to soften when heated and solidify when cooled. During the hot riveting process, rivets corresponding to the fixing bracket 212 are provided on the shell body 211. The rivets on the shell body 211 are inserted into the corresponding holes on the fixing bracket 212, and then the rivets are heated and melted. After being deformed by pressure and cooled, the fixing bracket 212 and the shell body 211 are fixed together. The shell body 211 and the rivets can be processed into a single piece by injection molding, and the fixing bracket 212 can be made of metal.

[0043] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the cross-section of the body part 31 is rectangular, and the radial dimension of the body part 31 is greater than the axial dimension of the body part 31.

[0044] In other words, the body part 31 and the valve body 1 are in contact or even in contact. By making the cross-section of the body part 31 rectangular and making the radial dimension of the body part 31 larger than the axial dimension of the body part 31, when the valve body 1 moves relative to the body part 31, the body part 31 can be more firmly confined in the sealing groove 214, making the body part 31 less prone to deformation and less prone to falling out of the sealing groove 214. As a result, the sealing ring 3 can be reliably sealed between the valve body 1 and the coil assembly 2, which can reduce the risk of moisture or water from the external environment penetrating into the coil 22 and causing a decrease in the electrical insulation performance of the coil 22, thereby making the electronic expansion valve 100 have high safety and reliability.

[0045] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the corners of the body portion 31 are rounded. Therefore, when the valve body 1 comes into contact with or even moves relative to the body portion 31, the body portion 31 is less likely to deform.

[0046] For details, please refer to [link / reference]. Figure 2 As shown, the cross-section of the main body 31 is rectangular, the deformable part 32 is connected to one corner of the rectangle, and the other three corners of the rectangle are all rounded.

[0047] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the body part 31 and the deformable part 32 are connected by an arc. In this way, when the gas in the receiving cavity 213 compresses the deformable part 32 and causes it to deform, the deformable part 32 can be compressed better. Furthermore, when the deformable part 32 deforms relative to the body part 31, the stress concentration between the body part 31 and the deformable part 32 can be reduced, thereby improving the reliability of the sealing ring 3.

[0048] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, in the direction away from the main body 31, the deformable portion 32 extends with equal thickness, or at least part of the deformable portion 32 gradually increases in thickness.

[0049] For example, the deformable part 32 extends with equal thickness, which has a simple structure, low production difficulty, and can reduce production costs.

[0050] For example, in the direction away from the main body 31, the thickness of the deformable portion 32 may gradually increase in part or all of the deformable portion 32. Thus, when the gas in the receiving cavity 213 compresses the deformable portion 32 and deforms it, the thickness of the deformable portion 32 near the main body 31 is relatively small, making it easier for the deformable portion 32 to deform. This not only facilitates the discharge of gas from the receiving cavity 213, but also, when external gas compresses the deformable portion 32 along the side wall of the sealing groove 214, the external gas can better deform the deformable portion 32 in a direction away from the main body 31. This allows the sealing ring 3 to more firmly seal the assembly gap between the valve body 1 and the coil assembly 2, reducing the risk of moisture or water from the external environment penetrating the inside of the coil 22 and causing a decrease in the electrical insulation performance of the coil 22. This results in the electronic expansion valve 100 having higher safety and reliability.

[0051] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the end of the deformable part 32 that is away from the main body part 31 is rounded.

[0052] In other words, the end of the deformable part 32 abuts against the wall of the sealing groove 214. When the deformable part 32 deforms, by making the end of the deformable part 32 away from the main body part 31 rounded, the end of the deformable part 32 is not easily damaged, thereby reliably sealing.

[0053] Finally, regarding the above examples, it should be noted that the situation where the gas in the receiving cavity 213 compresses the deformable part 32 occurs when the valve body 1 moves, causing the gas pressure in the receiving cavity 213 to be greater than the gas pressure of the external environment. Although the above examples are not described in every example, they are only omitted for the sake of ease of description.

[0054] Other configurations and operations of the electronic expansion valve 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0055] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic expansion valve (100) characterized by, The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

2. Electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

3. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

4. Electronic expansion valve (100) according to claim 3, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

5. The electronic expansion valve (100) according to claim 3, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

6. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

7. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

8. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

9. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together.

10. The electronic expansion valve (100) according to claim 1, characterized in that The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. The utility model relates to a valve body (1) and a coil assembly (2) which are connected together. 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