Electronic expansion valve
By designing sealing grooves and pressure relief channels in the electronic expansion valve, as well as deformation gaps and arc surface structures, the problem of pressure difference and residual refrigerant when opening the valve is solved, and the protection and sealing performance of the seal are achieved Improvement.
Patent Information
- Application Number
- CN202323575667.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-26
AI Technical Summary
When the electronic expansion valve is opened, the seal is affected by the refrigerant pressure difference, resulting in a degradation of sealing performance, and the refrigerant residue causes expansion and deformation of the sealing performance, affecting the sealing performance.
An electronic expansion valve is designed, including a valve seat assembly, a valve needle assembly and a sealing member. The valve needle assembly has a sealing groove and a pressure relief passage. The pressure relief passage connects the sealing groove and the valve cavity to ensure that the fluid can be discharged in time and avoid the sealing member. Extrusion, deformation gap and arc surface structure are adopted to accommodate the expansion of the seal, enhancing seal performance.
Effectively protect the seal, extend its service life, ensure sealing performance, prevent fluid residue from extrusion and deformation of the seal, and improve sealing performance and fluid discharge efficiency.
Smart Images
Figure CN222210860U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of valve technology, and in particular to an electronic expansion valve. Background Art
[0002] An electronic expansion valve is a throttling element that can adjust the refrigerant flow rate according to a preset program. In the related art, a seal is installed on the valve needle to facilitate sealing when the valve is closed, and there is a gap between the seal and the valve needle to accommodate the thermal expansion of the seal. However, when the electronic expansion valve is opened, the gap will be filled with refrigerant, and a pressure difference will be formed between the refrigerant in the gap and the refrigerant outside the gap, which will in turn produce an extrusion force on the seal, causing the seal to deform and affect the sealing performance of the seal; or the refrigerant that enters the gap cannot be discharged in time, and the refrigerant accumulates in the gap, causing the seal to expand and deform, affecting the sealing performance of the seal. Utility Model Content
[0003] Based on this, it is necessary to provide an electronic expansion valve to protect the structure of the seal and ensure the sealing performance of the seal.
[0004] An electronic expansion valve comprises a valve seat assembly, a valve needle assembly and a first sealing member; the valve seat assembly is provided with a valve cavity, and a cavity wall of the valve cavity is located at one axial end of the valve seat assembly and is configured with an abutment portion; the valve needle assembly can be movably installed in the valve cavity; the valve needle assembly is configured with a sealing groove and a pressure relief channel, and the pressure relief channel is connected to the sealing groove and the valve cavity; the first sealing member is installed in the sealing groove, and the fluid in the sealing groove can be discharged to the valve cavity through the pressure relief channel; wherein the valve needle assembly has a valve opening position and a valve closing position, and in the valve opening position, the first sealing member is pressed against the abutment portion; in the valve closing position, the first sealing member is away from the abutment portion.
[0005] It is understandable that the valve needle controls the matching state of the first sealing member and the abutting portion through its own movement, thereby realizing the regulation of the opening and closing of the electronic expansion valve. When opening the valve, the valve needle drives the first sealing member away from the abutting portion to realize the fluid circulation. At this time, part of the fluid will enter the sealing groove; when closing the valve, the valve needle drives the first sealing member to abut against the abutting portion to form a seal to block the fluid circulation. At this time, part of the fluid remains in the sealing groove. The pressure relief channel can discharge the fluid in the sealing groove in time to avoid the fluid squeezing the first sealing member, so as to protect the structure of the first sealing member, extend the service life of the first sealing member, and ensure the sealing performance of the first sealing member.
[0006] In one of the embodiments, a deformation gap is constructed between the first sealing member and the groove wall of the sealing groove, the deformation gap is arranged opposite to the pressure relief channel, and the deformation gap is connected to the pressure relief channel.
[0007] It can be understood that there is a deformation gap between the first sealing member and the sealing groove to accommodate thermal expansion of the first sealing member.
[0008] In one of the embodiments, a side of the first sealing member facing the pressure relief channel is configured as an arc surface, and the deformation gap is formed between the arc surface and the groove wall of the sealing groove.
[0009] It can be understood that the arc surface can reduce flow resistance, guide the fluid to flow into the pressure relief channel, and promote fluid discharge.
[0010] In one embodiment, the valve needle assembly is configured with a sealing groove having a wall surface including a first wall surface, a second wall surface and a third wall surface, the first wall surface and the third wall surface are radially oppositely arranged along the valve needle assembly, the second wall surface is located between the first wall surface and the third wall surface, and at least one of the first wall surface, the second wall surface and the third wall surface is provided with the pressure relief channel.
[0011] It can be understood that by providing a pressure relief channel in at least one of the three wall surfaces so as to be directly connected to the sealing groove, the structure is simple.
[0012] In one of the embodiments, a second sealing member is provided between the valve needle assembly and the valve seat assembly; the valve cavity includes a back pressure cavity, the valve seat assembly is provided with a first through hole and a second through hole, and along the axial direction of the valve seat assembly, the first sealing member is located between the first through hole and the second through hole; along the radial direction of the valve seat assembly, the second sealing member is located between the back pressure cavity and the second through hole; the valve needle assembly is provided with a balancing flow channel connecting the first through hole and the back pressure cavity.
[0013] It can be understood that the second seal is provided to enhance the moving sealing performance of the valve needle assembly relative to the valve seat assembly to prevent the fluid from entering the gap between the valve needle assembly and the valve seat assembly. The balancing flow channel is provided to discharge the pressure in the back pressure chamber and reduce the interference of the pressure in the back pressure chamber on the movement of the valve needle assembly.
[0014] In one embodiment, the pressure relief channel of the third wall includes a first pressure relief hole and a second pressure relief hole connected to the first pressure relief hole, the first pressure relief hole and the second pressure relief hole are arranged at an angle, and the axial direction of the second pressure relief hole is in the same direction as the axial direction of the valve needle assembly, the first pressure relief hole is connected to the sealing groove, the second pressure relief hole is the balancing flow channel, and the second pressure relief hole is connected to the back pressure chamber and the first through hole.
[0015] It can be understood that the first pressure relief hole and the second pressure relief hole can together form a pressure relief channel to transport the fluid from the sealing groove to the valve chamber, which has a simple structure and is easy to process.
[0016] In one embodiment, the electronic expansion valve also includes a drive assembly, which includes a screw and a bearing, wherein the screw is connected to the inner ring of the bearing, and the outer ring of the bearing is fixed in the valve needle assembly; the electronic expansion valve also includes an elastic member, which is sleeved on the valve needle assembly, and the elastic member is axially connected between the valve needle assembly and the valve seat assembly along the valve needle assembly.
[0017] It is understandable that the screw can transmit power to the valve needle assembly through the bearing, thereby driving the valve needle assembly to move and realize the opening and closing of the electronic expansion valve. The elastic member exerts elastic force on the valve needle assembly to balance the force exerted by the fluid on the valve needle assembly, thereby ensuring the stability of the sealing performance of the first sealing member in the valve needle assembly.
[0018] In one embodiment, the valve seat assembly includes a first guide section and a second guide section, and the first guide section and the second guide section are both guided and cooperated with the valve needle assembly; a first seal is arranged on the second guide section, and the second seal is located between the first guide section and the valve needle assembly.
[0019] It can be understood that the first guide section and the second guide section are provided to enhance the guidance of the valve needle movement and improve the smoothness of the overall movement of the valve needle assembly.
[0020] In one embodiment, the valve needle assembly includes a valve needle and a guide seat, the first guide section and the second guide section are both guided and cooperated with the guide seat; the end of the valve needle away from the bearing is connected to the guide seat; the guide seat includes a first seat body and a second seat body, the first seat body is sleeved on the valve needle, the second seat body is sleeved on the outer peripheral side of the first seat body, and together with the first seat body, they are surrounded to form the sealing groove.
[0021] It is understandable that the guide seat has a guiding effect on the valve needle. Specifically, the first seat body guides the axial movement of the valve needle, and the second seat body can enhance the guiding effect on the valve needle, and try to avoid the end of the valve needle close to the abutment portion from shaking. At the same time, the second seat body and the first seat body jointly form a sealing groove to facilitate the assembly of the first sealing member.
[0022] In one embodiment, the first seat body has an assembly groove, which is formed by being recessed inward from the outer peripheral surface of the first seat body along the radial direction of the first seat body; the inner wall of the second seat body and the groove wall of the assembly groove are jointly arranged to form the sealing groove; along the axial direction of the first seat body, the sealing groove is provided with an opening on one side facing the abutment portion.
[0023] It is understandable that the second seat body cooperates with the assembly groove to form a sealing groove, so that the first sealing member is first installed into the assembly groove, and then the second seat body is assembled for further positioning, which is easy to assemble. The sealing groove opening is arranged so that the abutment portion passes through the opening and abuts against the first sealing member.
[0024] In one embodiment, the valve seat assembly includes a first valve seat and a second valve seat, the first valve seat forms the valve cavity, at least a portion of the second valve seat extends into the first valve seat, and the abutment portion is formed at the end of the second valve seat extending into the first valve seat; the first valve seat is provided with a third through hole connected to the valve cavity, and the axial direction of the third through hole is arranged at an angle to the axial direction of the valve cavity.
[0025] It can be understood that the provision of the first valve seat and the second valve seat facilitates processing and assembly, and the provision of the third through hole facilitates the release of pressure in the valve cavity, thus promoting smooth opening and closing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0027] Figure 1 A cross-sectional view of the electronic expansion valve provided for this application;
[0028] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.
[0029] Reference numerals: 100, electronic expansion valve; 10, valve seat assembly; 101, first through hole; 102, second through hole; 103, first guide section; 104, second guide section; 11, first valve seat; 111, valve cavity; 1111, back pressure cavity; 112, third through hole; 12, second valve seat; 121, abutment portion; 20, valve needle assembly; 21, valve needle; 22, guide seat; 2201, sealing groove; 22011, first wall surface; 22012, second wall surface; 22013, third wall surface; 2202, opening; 2203, deformation gap; 22021, tapered section; 22022, flush section; 221, first seat body; 2211, assembly groove; 22111, first side; 22112, second side; 2212, pressure relief channel; 22121, first pressure relief hole; 22122, second pressure relief hole; 222, second seat body; 2221, limit stop arm; 31, first seal; 32, second seal; 40, drive assembly; 41, screw; 42, bearing; 50, elastic member. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0031] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0034] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.
[0035] See also Figure 1 to Figure 2The present application provides an electronic expansion valve 100, which includes a valve seat assembly 10, a valve needle assembly 20 and a first sealing member 31; the valve seat assembly 10 is provided with a valve cavity 111, and the cavity wall of the valve cavity 111 is located at one end of the axial direction of the valve seat assembly 10 and is configured with an abutment portion 121; the valve needle assembly 20 can be movably installed in the valve cavity 111; the valve needle assembly 20 is configured with a sealing groove 2201 and a pressure relief channel 2212, and the pressure relief channel 2212 is connected to the sealing groove 2201 and the valve cavity 111; the first sealing member 31 is installed in the sealing groove 2201, and the fluid in the sealing groove 2201 can be discharged to the valve cavity 111 through the pressure relief channel 2212; wherein the valve needle assembly 20 has a valve opening position and a valve closing position, in which the first sealing member 31 is pressed against the abutment portion 121 in the valve opening position; in the valve closing position, the first sealing member 31 is away from the abutment portion 121.
[0036] In this way, the valve seat assembly 10 is provided with a valve cavity 111 to accommodate the valve needle assembly 20. Specifically, the valve needle 21 can move in the valve cavity 111, and a sealing groove 2201 is provided to facilitate the installation of the first sealing member 31. In the valve opening position, the valve needle 21 moves to make the first sealing member 31 away from the abutting portion 121, and the fluid inside the electronic expansion valve 100 circulates, and part of the fluid enters the sealing groove 2201. In the valve closing position, the valve needle 21 moves to make the first sealing member 31 pressed against the abutting portion 121, and there is residual fluid in the sealing groove 2201. The fluid in the sealing groove 2201 will squeeze the first sealing member 31, causing it to deform and fail, so the pressure relief channel 2212 is provided to timely discharge the fluid in the sealing groove 2201 into the valve cavity 111, so as to avoid the squeezing and deformation of the first sealing member 31 by the fluid as much as possible, which is beneficial to protecting the first sealing member 31, extending the service life of the first sealing member 31, and ensuring the sealing performance of the first sealing member 31.
[0037] Since the first seal 31 generates extrusion force when it expands due to heat, a deformation gap 2203 is configured between the first seal 31 and the groove wall of the sealing groove 2201, and the deformation gap 2203 is arranged opposite to the pressure relief channel 2212, and the deformation gap 2203 is connected to the pressure relief channel 2212, so that the deformation gap 2203 can accommodate the deformation caused by the thermal expansion of the first seal 31 to protect the structure of the first seal 31. Exemplarily, the first seal 31 can be set as a sealing gasket.
[0038] like Figure 2 As shown, in an optional embodiment, the side of the first sealing member 31 facing the pressure relief channel 2212 is set as an arc surface, and the deformation gap 2203 is formed between the arc surface and the groove wall of the sealing groove 2201. In this way, the arc surface is set to form a deformation gap 2203 to accommodate the thermal expansion of the first sealing member 31. The arc surface also has a drainage effect on the fluid, which can guide the fluid to the pressure relief channel 2212, and at the same time can reduce the flow resistance and promote the discharge of the fluid.
[0039] In an optional embodiment, the valve needle assembly 20 is constructed with a sealing groove 2201 having a wall surface including a first wall surface 22011, a second wall surface 22012 and a third wall surface 22013, the first wall surface 22011 and the third wall surface 22013 are radially arranged opposite to each other along the valve needle assembly 20, the second wall surface 22012 is located between the first wall surface 22011 and the third wall surface 22013, and at least one of the first wall surface 22011, the second wall surface 22012 and the third wall surface 22013 is provided with a pressure relief channel 2212.
[0040] In this way, the first wall 22011, the second wall 22012 and the third wall 22013 can respectively limit the first sealing component 31. At least one of the first wall 22011, the second wall 22012 and the third wall 22013 is provided with a pressure relief channel 2212, which facilitates the pressure relief channel 2212 to be directly connected to the sealing groove 2201, and the operation is simple.
[0041] In a further embodiment, a second sealing member 32 is provided between the valve needle assembly 20 and the valve seat assembly 10; the valve cavity 111 includes a back pressure cavity 1111, and the valve seat assembly 10 is provided with a first through hole 101 and a second through hole 102, and along the axial direction of the valve seat assembly 10, the first sealing member 31 is located between the first through hole 101 and the second through hole 102; along the radial direction of the valve seat assembly 10, the second sealing member 32 is located between the back pressure cavity 1111 and the second through hole 102; the valve needle assembly 20 is provided with a balancing flow channel connecting the first through hole 101 and the back pressure cavity 1111.
[0042] In this way, when the valve needle assembly 20 moves in the valve cavity 111, the gas in the back pressure cavity 1111 is compressed, the pressure in the back pressure cavity 1111 increases, and the pressure can be released outward through the balance flow channel to achieve pressure balance, thereby ensuring the smooth back and forth movement of the valve needle assembly 20. At the same time, the second sealing member 32 is provided to ensure the sealing performance of the valve needle assembly 20 when it moves.
[0043] like Figure 1 As shown, in a specific embodiment, the valve seat assembly 10 includes a first valve seat 11 and a second valve seat 12, the first valve seat 11 forms a valve cavity 111, at least a portion of the second valve seat 12 extends into the first valve seat 11, and the abutment portion 121 is formed at the end of the second valve seat 12 extending into the first valve seat 11. In this way, the valve cavity 111 and the abutment portion 121 are respectively processed through the first valve seat 11 and the second valve seat 12, the structure is simple, the assembly is simple, it is conducive to reducing the difficulty of processing and improving production efficiency.
[0044] like Figure 1 and Figure 2As shown, in an optional embodiment, taking the third wall 22013 as an example in which a pressure relief channel 2212 is provided, the pressure relief channel 2212 includes a first pressure relief hole 22121 and a second pressure relief hole 22122 connected to the first pressure relief hole 22121, the first pressure relief hole 22121 and the second pressure relief hole 22122 are arranged at an angle, and the axial direction of the second pressure relief hole 22122 is in the same direction as the axial direction of the valve needle assembly 20, the first pressure relief hole 22121 is connected to the sealing groove 2201, the second pressure relief hole 22122 is a balancing flow channel, and the second pressure relief hole 22122 is connected to the back pressure chamber 1111 and the first through hole 101.
[0045] In this way, the fluid in the sealing groove 2201 can first enter the first pressure relief hole 22121, then enter the second pressure relief hole 22122 and enter the valve cavity 111 and the first through hole 101 along the axial direction of the second pressure relief hole 22122, so as to discharge the fluid in the sealing groove 2201. In a specific embodiment, the axial direction of the first pressure relief hole 22121 can be in the same direction as the radial direction of the valve needle assembly 20, so that the position and size of the first pressure relief hole 22121 and the second pressure relief hole 22122 can be easily determined during processing, so as to reduce the processing difficulty and improve the production efficiency.
[0046] In an optional embodiment, the valve needle assembly 20 includes a valve needle 21 and a guide seat 22. The guide seat 22 can limit the radial shaking of the valve needle 21 and promote the axial movement of the valve needle 21.
[0047] Furthermore, one end of the valve needle 21 away from the bearing 42 is connected to the guide seat 22; the valve seat assembly 10 includes a first guide section 103 and a second guide section 104, both of which are guided and matched with the valve needle assembly 20; the first sealing member 31 is arranged in the second guide section 104, and the second sealing member 32 is located between the first guide section 103 and the valve needle assembly 20. In this way, the first guide section 103 and the second guide section 104 can further guide the valve needle assembly 20 to move axially as a whole, and promote the stability of the overall movement of the valve needle assembly 20. At the same time, the second sealing member 32 is arranged to ensure the sealing performance of the valve needle assembly 20 when it moves.
[0048] like Figure 1 As shown, in a specific embodiment, the guide seat 22 includes a first seat body 221, which is sleeved on the valve needle 21, and the first seat body 221 is provided with a pressure relief channel 2212. In this way, the first seat body 221 has a guiding effect on the axial movement of the valve needle 21, and pressure is relieved through the pressure relief channel 2212 on the basis of guiding, achieving a dual-purpose effect.
[0049] like Figure 1As shown, in a further embodiment, the guide seat 22 further includes a second seat body 222, which is sleeved on the outer peripheral side of the first seat body 221 and is surrounded together with the first seat body 221 to form a sealing groove 2201. In this way, the second seat body 222 can further guide the valve needle 21 on the basis of the first seat body 221, reduce or avoid the shaking of the valve needle 21 in the radial direction, and enable the valve needle 21 to drive the first sealing member 31 to accurately press the abutment portion 121.
[0050] like Figure 1 and Figure 2 As shown, in a further embodiment, the first seat body 221 has an assembly groove 2211, which is formed by being recessed radially inward from the outer peripheral surface of the first seat body 221 along the first seat body 221; the inner wall of the second seat body 222 and the groove wall of the assembly groove 2211 are jointly arranged to form a sealing groove 2201; along the axial direction of the first seat body 221, an opening 2202 is provided on one side of the sealing groove 2201 facing the abutment portion 121.
[0051] In this way, the assembly groove 2211 forms the main body space of the sealing groove 2201, and the first sealing member 31 can be first installed in the assembly groove 2211 and then the second seat body 222 can be installed, and the assembly method is simple. The second seat body 222 forms the groove wall of the sealing groove 2201 to limit the first sealing member 31 along the radial direction of the valve needle 21 to prevent the first sealing member 31 from falling out. The second seat body 222 and the first seat body 221 form the opening 2202 of the sealing groove 2201 so that the abutting portion 121 passes through the opening 2202 and is pressed and matched with the first sealing member 31.
[0052] like Figure 1 and Figure 2 In a further embodiment, along the axial direction of the valve needle assembly 20, the notch of the assembly groove 2211 has a first side 22111 and a second side 22112 that are opposite and spaced apart, the second side 22112 is disposed toward the abutment portion 121, and the first side 22111 is disposed away from the abutment portion 121; wherein, along the radial direction of the valve needle assembly 20, the first side 22111 is disposed protruding from the second side 22112.
[0053] In this way, along the radial direction of the valve needle 21, the groove wall size of the assembly groove 2211 on the second side 22112 is smaller than the groove wall size of the assembly groove 2211 on the first side 22111, so as to reserve sufficient space on the second side 22112 to cooperate with the second seat body 222 to form an opening 2202 of the sealing groove 2201.
[0054] like Figure 1 and Figure 2As shown, in a specific embodiment, along the axis of the valve needle assembly 20, one end of the second seat body 222 facing the abutting portion 121 is configured with a limit stop arm 2221, the limit stop arm 2221 and the second side 22112 are opposite and spaced apart along the radial direction of the valve needle assembly 20, the opening 2202 is formed between the limit stop arm 2221 and the second side 22112, and the limit stop arm 2221 is limited to the side of the first sealing member 31 facing the abutting portion 121. In this way, the limit stop arm 2221 has a limiting effect on the first sealing member 31 along the axial direction of the valve needle 21, and can form an opening 2202 with the second side 22112.
[0055] like Figure 2 As shown, in a further embodiment, along the axial direction of the valve needle assembly 20, from the abutting portion 121 toward the valve needle assembly 20, the opening 2202 includes a tapered section 22021 and a flush section 22022 connected to the tapered section 22021. In this way, the size of the opening 2202 facing the abutting portion 121 is larger, and the size of the opening 2202 gradually decreases from the abutting portion 121 toward the valve needle assembly 20 until it remains unchanged at the flush section 22022, so as to form a larger space for the abutting portion 121 to extend therein, and at the same time, the tapered section 22021 can also guide the abutting portion 121 to slide along the tapered section 22021 to the flush section 22022 until the first sealing member 31 is crimped with the abutting portion 121, and the tapered section 22021 and the flush section 22022 respectively have a radial limiting effect on the abutting portion 121.
[0056] like Figure 1 As shown, in an optional embodiment, the first valve seat 11 is provided with a third through hole 112 communicating with the valve cavity 111, and the axial direction of the third through hole 112 is arranged at an angle with the axial direction of the valve cavity 111. In this way, the movement of the valve needle assembly 20 in the valve cavity 111 has a compression effect on the gas in the valve cavity 111, which easily causes the pressure in the valve cavity 111 to increase, and forms a pressure difference with the external fluid of the valve seat assembly 10, affecting the reciprocating movement of the valve needle assembly 20. The third through hole 112 can connect the fluid in the valve cavity 111 with the external fluid to discharge the high-pressure fluid, which is conducive to the normal movement of the valve needle assembly 20.
[0057] In a specific embodiment, the electronic expansion valve 100 further includes a drive assembly 40, which includes a screw 41 and a bearing 42, wherein the screw 41 is connected to the inner ring of the bearing 42, and the outer ring of the bearing 42 is fixed in the valve needle assembly 20; thus, the bearing 42 can support the rotation of the screw 41 and promote the smooth rotation of the screw 41. The screw 41 transmits the rotation to the valve needle assembly 20 through the bearing 42 to drive the valve needle assembly 20 to move.
[0058] In a further embodiment, the electronic expansion valve 100 further includes an elastic member 50, which is sleeved on the valve needle assembly 20, and the elastic member 50 is axially connected between the valve needle assembly 20 and the valve seat assembly 10 along the valve needle assembly 20. The elastic member 50 is used to improve the sealing performance between the valve needle assembly 20 and the first sealing member 31. When the electronic expansion valve 100 is closed, the screw 41 rotates through the bearing 42 to directly drive the valve needle assembly 20 to move toward the first through hole 101. The elastic member 50 always exerts an elastic force on the valve needle assembly 20 toward the first through hole 101, which can provide a pre-tightening force for closing the valve, so that the valve needle assembly 20 and the first sealing member 31 are closely matched, thereby improving the sealing performance when closing the valve. Exemplarily, the elastic member 50 can be set as a spring.
[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.
Claims
1. An electronic expansion valve, characterized in that: include: A valve seat assembly (10) is provided with a valve cavity (111), wherein a cavity wall of the valve cavity (111) is located at one axial end of the valve seat assembly (10) and is provided with an abutment portion (121); A valve needle assembly (20) is movably mounted in the valve cavity (111); the valve needle assembly (20) is configured with a sealing groove (2201) and a pressure relief channel (2212), and the pressure relief channel (2212) is connected to the sealing groove (2201) and the valve cavity (111); A first sealing member (31) is installed in the sealing groove (2201), and the fluid in the sealing groove (2201) can be discharged to the valve chamber (111) through the pressure relief channel (2212); The valve needle assembly (20) has an open valve position and a closed valve position. In the open valve position, the first sealing member (31) is pressed against the abutment portion (121); in the closed valve position, the first sealing member (31) is away from the abutment portion (121).
2. The electronic expansion valve according to claim 1, characterized in that: A deformation gap (2203) is constructed between the first sealing component (31) and the groove wall of the sealing groove (2201), and the deformation gap (2203) is arranged opposite to the pressure relief channel (2212), and the deformation gap (2203) is connected to the pressure relief channel (2212).
3. The electronic expansion valve according to claim 2, characterized in that: The side of the first sealing member (31) facing the pressure relief channel (2212) is arranged as an arc surface, and the deformation gap (2203) is formed between the arc surface and the groove wall of the sealing groove (2201).
4. The electronic expansion valve according to claim 2, characterized in that: The valve needle assembly (20) is configured with a sealing groove (2201) having a wall surface including a first wall surface (22011), a second wall surface (22012) and a third wall surface (22013); the first wall surface (22011) and the third wall surface (22013) are radially arranged opposite to each other along the valve needle assembly (20); the second wall surface (22012) is located between the first wall surface (22011) and the third wall surface (22013); and at least one of the first wall surface (22011), the second wall surface (22012) and the third wall surface (22013) is provided with the pressure relief channel (2212).
5. The electronic expansion valve according to claim 4, characterized in that: A second sealing member (32) is provided between the valve needle assembly (20) and the valve seat assembly (10); The valve cavity (111) comprises a back pressure cavity (1111), the valve seat assembly (10) is provided with a first through hole (101) and a second through hole (102), and along the axial direction of the valve seat assembly (10), the first sealing member (31) is located between the first through hole (101) and the second through hole (102); Along the radial direction of the valve seat assembly (10), the second sealing member (32) is located between the back pressure chamber (1111) and the second through hole (102); and the valve needle assembly (20) is provided with a balancing flow channel connecting the first through hole (101) and the back pressure chamber (1111).
6. The electronic expansion valve according to claim 5, characterized in that: The pressure relief channel (2212) of the third wall (22013) includes a first pressure relief hole (22121) and a second pressure relief hole (22122) connected to the first pressure relief hole (22121), the first pressure relief hole (22121) and the second pressure relief hole (22122) are arranged at an angle, and the axial direction of the second pressure relief hole (22122) is in the same direction as the axial direction of the valve needle assembly (20), the first pressure relief hole (22121) is connected to the sealing groove (2201), the second pressure relief hole (22122) is the balancing flow channel, and the second pressure relief hole (22122) is connected to the back pressure chamber (1111) and the first through hole (101).
7. The electronic expansion valve according to claim 5, characterized in that: The electronic expansion valve further comprises a drive assembly (40), wherein the drive assembly (40) comprises a screw (41) and a bearing (42), wherein the screw (41) is connected to an inner ring of the bearing (42), and an outer ring of the bearing (42) is fixed in the valve needle assembly (20); The electronic expansion valve further comprises an elastic member (50), wherein the elastic member (50) is sleeved on the valve needle assembly (20), and the elastic member (50) is axially connected between the valve needle assembly (20) and the valve seat assembly (10) along the valve needle assembly (20).
8. The electronic expansion valve according to claim 7, characterized in that: The valve seat assembly (10) includes a first guide section (103) and a second guide section (104), and the first guide section (103) and the second guide section (104) are both guided and matched with the valve needle assembly (20); a first sealing member (31) is arranged on the second guide section (104), and the second sealing member (32) is located between the first guide section (103) and the valve needle assembly (20).
9. The electronic expansion valve according to claim 8, characterized in that: The valve needle assembly (20) comprises a valve needle (21) and a guide seat (22), wherein the first guide section (103) and the second guide section (104) are both guided and matched with the guide seat (22); an end of the valve needle (21) away from the bearing (42) is connected to the guide seat (22); The guide seat (22) includes a first seat body (221) and a second seat body (222), wherein the first seat body (221) is sleeved on the valve needle (21), and the second seat body (222) is sleeved on the outer peripheral side of the first seat body (221), and together with the first seat body (221) form the sealing groove (2201).
10. The electronic expansion valve according to claim 9, characterized in that: The first seat body (221) has an assembly groove (2211), and the assembly groove (2211) is formed by being recessed inwardly from the outer peripheral surface of the first seat body (221) along the radial direction of the first seat body (221); the inner wall of the second seat body (222) and the groove wall of the assembly groove (2211) are jointly arranged to form the sealing groove (2201); Along the axial direction of the first seat body (221), an opening (2202) is provided on one side of the sealing groove (2201) facing the abutting portion (121).
11. The electronic expansion valve according to any one of claims 1 to 10, characterized in that: The valve seat assembly (10) comprises a first valve seat (11) and a second valve seat (12), wherein at least a portion of the second valve seat (12) extends into the first valve seat (11), and the abutment portion (121) is formed at an end portion of the second valve seat (12) extending into the first valve seat (11); The first valve seat (11) is provided with a third through hole (112) communicating with the valve cavity (111), and the axial direction of the third through hole (112) is arranged at an angle to the axial direction of the valve cavity (111).