Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat assembly and a valve element assembly. A valve cavity is formed in the valve seat assembly and provided with a first valve port. The valve element assembly comprises a first valve needle, a second valve needle and a drainage groove body. The first valve needle is arranged in the valve cavity, one end of the first valve needle is in sealing fit with the first valve port, and a transverse channel and a second valve port which communicate with each other are formed in the first valve needle. The extending direction of the transverse channel is perpendicular to the axial direction, and at least one end is opened in the side face of the first valve needle. The second valve needle is in sealing fit with the second valve port; the drainage groove body is arranged on the periphery of the first valve needle, a groove opening of the drainage groove body faces the first valve needle and is sealed by the first valve needle, a drainage hole is formed in the groove wall of the drainage groove body, and the transverse channel is communicated with the valve cavity through a groove cavity of the drainage groove body and the drainage hole.

Description

Technical Field

[0001] The present disclosure relates to the technical field of valves, and particularly to an electronic expansion valve. Background Art

[0002] As a throttling element, an electronic expansion valve is used to regulate the on-off and flow rate of a fluid. In the existing design of an electronic expansion valve, the valve core assembly is disposed in the valve cavity of a valve seat and includes a large valve needle and a small valve needle. The large valve needle is used to cooperate with the large valve port of the valve cavity to achieve the opening and closing of the large valve port. The large valve needle is provided with a small valve port, and the small valve needle is partially inserted into the large valve needle and used to cooperate with the small valve port to achieve the opening and closing of the small valve port. In the above existing solution, the large valve needle is provided with a transverse channel communicating with the small valve port, and the fluid in the valve cavity can flow into the small valve port through the transverse channel and then flow out of the small valve port. However, when the structure of the valve core assembly becomes complex, there will be a problem that it is inconvenient to arrange the transverse channel. Therefore, how to improve the convenience of arranging the transverse channel in the valve core assembly has become an important issue to be solved urgently in the related field. Summary of the Utility Model

[0003] A main object of the present disclosure is to overcome at least one defect of the above existing technology, and to provide an electronic expansion valve with relatively convenient processing of a transverse channel.

[0004] To achieve the above object, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, there is provided an electronic expansion valve, which includes a valve seat assembly and a valve core assembly; a valve cavity is provided inside the valve seat assembly, and the valve cavity is provided with a first valve port; the valve core assembly includes a first valve needle, a second valve needle and a drainage groove body; the first valve needle is disposed in the valve cavity; one end of the first valve needle is in sealing cooperation with the first valve port, and a transverse channel and a second valve port that are connected to each other are provided inside the first valve needle; the extending direction of the transverse channel is perpendicular to the axial direction, and at least one end of the transverse channel opens on the side surface of the first valve needle; the second valve needle is in sealing cooperation with the second valve port; the drainage groove body is disposed on the outer periphery of the first valve needle, the notch of the drainage groove body faces the first valve needle and is closed by the first valve needle, and a drainage hole is provided on the groove wall of the drainage groove body, and the transverse channel is connected to the valve cavity through the cavity of the drainage groove body and the drainage hole.

[0006] According to one embodiment of the present disclosure, the groove wall of the drainage groove body includes a bottom wall that is radially away from the first valve needle, and the drainage hole is provided on the bottom wall so that the fluid flows radially between the drainage groove body and the valve cavity.

[0007] According to one embodiment of the present disclosure, at least two of the drainage holes are provided on the bottom wall of the drainage groove body.

[0008] According to one embodiment of the present disclosure, the width of the cavity of the drainage groove body in the axial direction is greater than the width of the transverse channel in the axial direction.

[0009] According to one embodiment of the present disclosure, the drainage groove body has an annular groove structure and is arranged around the outer periphery of the first valve needle.

[0010] According to one embodiment of the present disclosure, the second valve port is located at the axial center position of the first valve needle, and the extending direction of the transverse channel is the radial direction of the first valve needle.

[0011] According to one embodiment of the present disclosure, at least one of the transverse channels is provided on the first valve needle, the transverse channel penetrates the first valve needle in the radial direction, both ends of the transverse channel open on the side surface of the first valve needle, and the second valve port communicates with the middle position of the transverse channel.

[0012] According to one embodiment of the present disclosure, one end of the transverse channel opens on the side surface of the first valve needle, and the other end communicates with the second valve port.

[0013] According to one embodiment of the present disclosure, at least two of the transverse channels are provided on the first valve needle, and the other ends of at least two of the transverse channels converge at one place and jointly communicate with the second valve port.

[0014] According to one embodiment of the present disclosure, at least two of the transverse channels are uniformly arranged along the circumferential direction of the first valve needle.

[0015] According to one embodiment of the present disclosure, wherein: the positions of at least one of the drainage holes and at least one of the transverse channels correspond to each other in the circumferential direction; and / or, the positions of at least one of the drainage holes and at least one of the transverse channels are offset in the circumferential direction.

[0016] According to one embodiment of the present disclosure, the first valve needle includes a first assembly body and a second assembly body that are separately arranged and connected to each other. A groove is provided on the side of the first assembly body facing the first valve port, and the groove and the side of the second assembly body facing away from the first valve port jointly form a flow cavity.

[0017] According to one embodiment of the present disclosure, the drainage groove body is located at one end of the first assembly body close to the first valve port.

[0018] According to one embodiment of the present disclosure, a first sealing ring is disposed on the outer periphery of the first valve needle. The material hardness of the first sealing ring is less than that of the material of the first valve port. When the first valve port is closed, the first sealing ring is in contact with the first valve port to achieve soft sealing. Wherein, a sealing boss is provided on the periphery of the end of the first valve needle close to the first valve port, and the drainage groove body is spaced apart on the side of the sealing boss axially away from the first valve port. The first sealing ring is axially clamped between the drainage groove body and the sealing boss.

[0019] As can be seen from the above technical solutions, the advantages and positive effects of the electronic expansion valve proposed by the present disclosure are as follows:

[0020] The spool assembly of the electronic expansion valve proposed by the present disclosure includes a first valve needle, a second valve needle, and a drainage groove body. One end of the first valve needle is in sealing cooperation with the first valve port of the valve cavity. A transverse channel and a second valve port that are connected are provided inside the first valve needle. The extending direction of the transverse channel is perpendicular to the axial direction, and the transverse channel opens on the side surface of the first valve needle. The second valve needle is in sealing cooperation with the second valve port. The drainage groove body is disposed on the outer periphery of the first valve needle. The notch of the drainage groove body faces the first valve needle and is closed by the first valve needle. Drainage holes are provided on the groove wall of the drainage groove body. The transverse channel is connected to the valve cavity through the cavity of the drainage groove body and the drainage holes. Through the above structural design, since the transverse channel can be connected to the valve cavity through the cavity of the drainage groove body and the drainage holes, the fluid can flow to the cavity of the drainage groove body through the drainage holes, and then flow to the transverse channel through the cavity of the drainage groove body. Due to the presence of the drainage groove body, the present disclosure does not need to arrange the drainage holes and the transverse channels in one-to-one correspondence, thereby reducing the processing difficulty of arranging the transverse channels in the spool assembly and improving the convenience of processing. Description of the Drawings

[0021] By considering the following detailed description of the preferred embodiments of the present disclosure in conjunction with the drawings, various objectives, features, and advantages of the present disclosure will become more apparent. The drawings are only exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0022] Figure 1 is a three-dimensional structural schematic diagram of an electronic expansion valve shown according to an exemplary embodiment;

[0023] Figure 2 is Figure 1 an axonometric sectional view of the electronic expansion valve shown;

[0024] Figure 3 is Figure 2 an enlarged schematic view of part E in

[0025] Figure 4 is Figure 1Schematic perspective view of the valve core assembly of the shown electronic expansion valve;

[0026] Figure 5 is Figure 4 an axonometric sectional view;

[0027] Figure 6 is Figure 4 a schematic perspective exploded view;

[0028] Figure 7 is Figure 4 a schematic perspective view of the shown valve core sleeve;

[0029] Figure 8 is Figure 7 an axonometric sectional view;

[0030] Figure 9 is Figure 4 a schematic cross-sectional view of the shown valve core assembly.

[0031] Explanation of reference numerals is as follows:

[0032] 100. Valve seat assembly;

[0033] 101. Valve cavity;

[0034] 1011. First valve port;

[0035] 200. Valve core assembly;

[0036] 210. First valve needle;

[0037] 2101. Flow cavity;

[0038] 2102. Second valve port;

[0039] 2103. Lateral channel;

[0040] 2104. Longitudinal channel;

[0041] 2105. Flow channel;

[0042] 211. First assembly;

[0043] 212. Second assembly;

[0044] 2121. Sealing boss;

[0045] 220. Second valve needle;

[0046] 231. First sealing ring;

[0047] 260. Drainage trough body;

[0048] 2601. Bottom wall;

[0049] 2602. Side wall;

[0050] 261. Drainage hole;

[0051] 400. Drive assembly;

[0052] 500. Housing. DETAILED DESCRIPTION

[0053] Typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different embodiments without departing from the scope of the present disclosure, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present disclosure.

[0054] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure and in which different exemplary structures, systems and steps that can implement multiple aspects of the present disclosure are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present disclosure. Moreover, although the terms "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present disclosure.

[0055] See also Figure 1 , which representatively shows a three-dimensional structural schematic diagram of the electronic expansion valve proposed in the present disclosure. In this exemplary embodiment, the electronic expansion valve proposed in the present disclosure is described by taking a valve applied to a refrigeration system as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the present disclosure to other application scenarios, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the electronic expansion valve proposed in the present disclosure.

[0056] like Figure 1 As shown, in one embodiment of the present disclosure, the electronic expansion valve provided by the present disclosure includes a valve seat assembly 100, a valve core assembly 200 and a drive assembly 400. Figures 2 to 8 , Figure 2 A representative axial cross-sectional view of an electronic expansion valve is shown in FIG. Figure 3 Representatively shown in Figure 2 An enlarged schematic diagram of part E in FIG. Figure 4 A three-dimensional structural schematic diagram of the valve core assembly 200 is representatively shown in FIG. Figure 5 Representatively shown inFigure 4 Axonometric sectional view; Figure 6 is representatively shown in Figure 4 Exploded perspective view; Figure 7 is representatively shown in the perspective structural view of the valve core sleeve;

[0057] Figure 8 is representatively shown in Figure 7 Axonometric sectional view; Figure 9 is representatively shown in the cross-sectional view of the valve core assembly 200, where the specific intercepting position is axially located at the drainage hole 261. The structures, connection methods, and functional relationships of the main components of the electronic expansion valve proposed in the present disclosure will be described in detail below in conjunction with the above-mentioned drawings.

[0058] As Figures 1 to 5 shown, in an embodiment of the present disclosure, a valve cavity 101 is provided inside the valve seat assembly 100, and a first valve port 1011 is provided in the valve cavity 101. The valve core assembly 200 includes a first valve needle 210, a second valve needle 220, and a drainage groove body 260. The first valve needle 210 is disposed in the valve cavity 101. One end of the first valve needle 210 is in sealing cooperation with the first valve port 1011, and a transverse channel 2103 and a second valve port 2102 that are connected are provided inside the first valve needle 210. The extending direction of the transverse channel 2103 is perpendicular to the axial direction, and at least one end of the transverse channel 2103 opens on the side surface of the first valve needle 210. One end of the second valve needle 220 facing the first valve port 1011 is in sealing cooperation with the second valve port 2102. The drainage groove body 260 is disposed on the outer periphery of the first valve needle 210. The notch of the drainage groove body 260 faces the first valve needle 210 and is closed by the first valve needle 210. Drainage holes 261 are provided on the groove wall of the drainage groove body 260, and the transverse channel 2103 is connected to the valve cavity 101 through the groove cavity of the drainage groove body 260 and the drainage holes 261. Through the above structural design, since the transverse channel 2103 can be connected to the valve cavity 101 through the groove cavity of the drainage groove body 260 and the drainage holes 261, the fluid can flow to the groove cavity of the drainage groove body 260 through the drainage holes 261, and then flow to the transverse channel 2103 through the groove cavity of the drainage groove body 260. Due to the presence of the drainage groove body 260, the present disclosure does not need to arrange the drainage holes 261 and the transverse channels 2103 in one-to-one correspondence, thereby reducing the processing difficulty of arranging the transverse channels 2103 in the valve core assembly 200 and improving the processing convenience.

[0059] As Figure 2As shown, in one embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure includes a driving assembly (400). The driving assembly 400 is used to drive the first valve needle 210 and the second valve needle 220 to move axially, so as to realize the opening and closing control of the first valve port 1011 and the second valve port 2102. For example, the driving assembly 400 can be arranged in a housing 500 and located at one end of the valve seat assembly 100 away from the first valve port 1011.

[0060] As Figure 2 and Figure 5 As shown, in one embodiment of the present disclosure, a flow cavity 2101, a flow channel 2105 and a longitudinal channel 2104 can also be arranged inside the first valve needle 210. The flow cavity 2101 is located on the side of the transverse channel 2103 and the longitudinal channel 2104 facing away from the first valve port 1011. One end of the flow channel 2105 communicates with the flow cavity 2101, and the other end of the flow channel 2105 opens at the end face of the first valve needle 210 facing away from the first valve port 1011. The extending direction of the longitudinal channel 2104 is parallel to the axial direction. One end of the longitudinal channel 2104 opens at the end face of the first valve needle 210 facing the first valve port 1011, and the other end of the longitudinal channel 2104 communicates with the flow cavity 2101. On this basis, the second valve needle 220 can be partially inserted into the flow cavity 2101 from the side of the first valve needle 210 facing away from the first valve port 1011.

[0061] As Figure 3 As shown, in one embodiment of the present disclosure, the groove wall of the drainage groove body 260 includes a bottom wall 2601 that is radially away from the first valve needle 210. In other words, since the opening direction (i.e., the orientation of the groove opening) of the drainage groove body 260 is radially facing the first valve needle 210 (for example, the circumferential surface of the second assembly 212 facing the first valve needle 210), the bottom wall 2601 of the drainage groove body 260 can be understood as the wall surface arranged opposite to the circumferential surface of the second assembly 212. On this basis, the drainage hole 261 can be arranged on the above-mentioned bottom wall 2601 of the drainage groove body 260, so that the fluid flows radially between the drainage groove body 260 and the valve cavity 101.

[0062] As Figure 7 and Figure 9 As shown, based on the structural design that the drainage hole 261 is arranged on the bottom wall 2601 of the drainage groove body 260, in one embodiment of the present disclosure, at least two drainage holes 261 can be arranged on the bottom wall 2601 of the drainage groove body 260, such as but not limited to the four drainage holes 261 shown in the drawings. Through the above structural design, the present disclosure can improve the uniformity of the fluid flow entering the drainage groove body 260 through the drainage hole 261. In some embodiments, only one drainage hole 261 can also be arranged on the bottom wall 2601 of the drainage groove body 260, and this embodiment is not limited.

[0063] AsFigure 7 and Figure 9 As shown in Figure 9 , based on the structural design in which at least two drainage holes 261 are provided on the bottom wall 2601 of the drainage groove body 260, in an embodiment of the present disclosure, at least two drainage holes 261 provided on the bottom wall 2601 of the drainage groove body 260 may be arranged uniformly in the circumferential direction. Through the above structural design, the present disclosure can further improve the uniformity of the fluid flow entering the drainage groove body 260 via the drainage holes 261.

[0064] As Figure 3 shown, in an embodiment of the present disclosure, along the axial direction, the width of the cavity of the drainage groove body 260 may be greater than the width (e.g., inner diameter) of the transverse channel 2103. In some embodiments, the width of the cavity of the drainage groove body 260 may also be equal to the axial width of the transverse channel 2103, and this is not limited to this embodiment.

[0065] As Figures 4 to 8 shown, in an embodiment of the present disclosure, the drainage groove body 260 may be in a ring groove structure, and the drainage groove body 260 is arranged around the outer periphery of the first valve needle 210. Through the above structural design, the present disclosure can make the fluid flow into each transverse channel 2103 via the drainage groove body 260 more uniform.

[0066] As Figure 9 shown, in an embodiment of the present disclosure, the second valve port 2102 may be located at the axial center position of the first valve needle 210. On this basis, the extending direction of the transverse channel 2103 may be the radial direction of the first valve needle 210. In some embodiments, the second valve port 2102 may also be located at other positions of the first valve needle 210. On this basis, the extending direction of the transverse channel 2103 may be the radial direction of the first valve needle 210, or may also be other directions perpendicular to the axial direction.

[0067] As Figure 2 , Figure 5 and Figure 9 shown, based on the structural design in which the transverse channel 2103 extends in the radial direction, in an embodiment of the present disclosure, the transverse channel 2103 may not extend through the first valve needle 210, that is, only one end of the transverse channel 2103 opens on the side surface of the first valve needle 210. Specifically, one end of the transverse channel 2103 opens on the side surface of the first valve needle 210, and the other end of the transverse channel 2103 communicates with the second valve port 2102. In other embodiments, still taking the structural design in which the extending direction of the transverse channel 2103 is the radial direction as an example, the first valve needle 210 is provided with at least one transverse channel 2103 that penetrates in the radial direction, that is, both ends of at least one transverse channel 2103 open on the side surface of the first valve needle 210, and then the second valve port 2102 communicates with the middle position of this transverse channel 2103.

[0068] AsFigure 9 As shown, based on the design that the lateral channels 2103 do not penetrate the first valve needle 210, in an embodiment of the present disclosure, the first valve needle 210 may be provided with three lateral channels 2103. One end of each of these three lateral channels 2103 opens to the side of the first valve needle 210 respectively, and the other ends of the three lateral channels 2103 converge at one place (such as the axis of the first valve needle 210) and are commonly connected to the second valve port 2102. In some embodiments, the first valve needle 210 may also be provided with two, four or more lateral channels 2103 that do not penetrate the first valve needle 210, and the present disclosure is not limited to the above embodiments.

[0069] As Figure 9 As shown, based on the design that one end of at least two lateral channels 2103 is commonly connected to the second valve port 2102, in another embodiment of the present disclosure, at least two lateral channels 2103 may be evenly arranged along the circumferential direction of the first valve needle 210. Through the above design, the present disclosure can make the fluid force received by the second valve needle 220 laterally more uniform, and make the total resultant force of the fluid force smaller, reducing the influence of the fluid force on the second valve needle 220.

[0070] As Figure 9 As shown, based on the structural design that the first valve needle 210 is provided with at least two lateral channels 2103, in an embodiment of the present disclosure, at least one drainage hole 261 corresponds to at least one lateral channel 2103 in the circumferential direction. On this basis, when the drainage groove body 260 is further provided with at least two drainage holes 261, at least one drainage hole 261 may be staggered from at least one lateral channel 2103 in the circumferential direction. Specifically, taking the three lateral channels 2103 and four drainage holes 261 shown in the drawings as an example, one lateral channel 2103 corresponds to one drainage hole 261, and the positions of the remaining lateral channels 2103 and the remaining drainage holes 261 are staggered in the circumferential direction. In some embodiments, when the number of drainage holes 261 is equal to the number of lateral channels 2103, each drainage hole 261 and each lateral channel 2103 may correspond one by one in the circumferential direction, or may not correspond at all, and the present disclosure is not limited to the above embodiments.

[0071] As Figures 5 to 8As shown, in an embodiment of the present disclosure, the first valve needle 210 may include a first assembly body 211 and a second assembly body 212 that are separately arranged and connected to each other. A groove may be provided on one side of the first assembly body 211 facing the first valve port 1011, and the groove and the side of the second assembly body 212 facing away from the first valve port 1011 together form a flow cavity 2101, that is, the groove participates in forming at least part of the cavity of the flow cavity 2101. Through the above design, the present disclosure can improve the structural rationality of the first valve needle 210. With a relatively small number of components and a relatively simple component structure, the formation of each channel and cavity of the first valve needle 210 can be achieved, and the structure is relatively reasonable, which is convenient for processing and assembly.

[0072] As Figures 5 to 8 shown, based on the structural design that the first valve needle 210 includes the first assembly body 211 and the second assembly body 212, in an embodiment of the present disclosure, the first assembly body 211 and the second assembly body 212 may be connected by means such as crimping, socketing, welding, etc., and the first assembly body 211 is located on the side of the second assembly body 212 away from the first valve port 1011. On this basis, the lateral channel 2103, the second valve port 2102, and the longitudinal channel 2104 are all provided in the second assembly body 212. Through the above design, the present disclosure can further improve the structural rationality of the first valve needle 210. With a relatively small number of components and a relatively simple component structure, the formation of each channel and cavity of the first valve needle 210 can be achieved, and the structure is relatively reasonable, which is convenient for processing and assembly.

[0073] As Figures 5 to 8 shown, based on the structural design that the first valve needle 210 includes the first assembly body 211 and the second assembly body 212, in an embodiment of the present disclosure, the drainage groove body 260 may be located at one end of the first assembly body 211 close to the first valve port 1011. Further, the drainage groove body 260 and the first assembly body 211 may be an integral structure. Through the above structural design, the present disclosure can reduce the number of components of the valve core assembly 200 and reduce the assembly difficulty. In some embodiments, the drainage groove body 260 may also be connected to the first assembly body 211 in other ways, or formed in the valve core assembly 200 in other ways, and is not limited to this embodiment.

[0074] As Figures 3 to 6As shown, in an embodiment of the present disclosure, a first sealing ring 231 may be provided on the outer periphery of the first valve needle 210. The material hardness of the first sealing ring 231 is less than that of the first valve port 1011. When the first valve port 1011 is closed, the first sealing ring 231 contacts the first valve port 1011 to achieve soft sealing. On this basis, a sealing boss 2121 may be provided on the periphery of one end of the first valve needle 210 (such as the second assembly 212) close to the first valve port 1011, and the drainage groove body 260 is spaced apart on the side of the sealing boss 2121 axially away from the first valve port 1011. Accordingly, the first sealing ring 231 can be axially clamped between the drainage groove body 260 and the sealing boss 2121. Through the above structural design, the present disclosure can use the first sealing ring 231 to achieve soft sealing of the first valve needle 210 to the first valve port 1011, and use the drainage groove body 260 (such as the side wall 2602 of the drainage groove body 260 close to the first valve port 1011) to participate in the fixed assembly of the first sealing ring 231, reducing the additional arrangement of other sealing ring positioning structures, which is beneficial to reducing the structural complexity and the number of components.

[0075] It should be noted here that the electronic expansion valves shown in the drawings and described in this specification are only a few examples of many electronic expansion valves that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details of the electronic expansion valves shown in the drawings or described in this specification or any components of the electronic expansion valves.

[0076] In summary, the spool assembly 200 of the electronic expansion valve proposed by the present disclosure includes a first valve needle 210, a second valve needle 220, and a drainage groove body 260; one end of the first valve needle 210 is in sealed cooperation with the first valve port 1011 of the valve cavity 101, and a transverse channel 2103 and a second valve port 2102 are provided inside the first valve needle 210; the extending direction of the transverse channel 2103 is perpendicular to the axial direction, and the transverse channel 2103 opens on the side surface of the first valve needle 210; the second valve needle 220 is in sealed cooperation with the second valve port 2102; the drainage groove body 260 is provided on the outer periphery of the first valve needle 210, the notch of the drainage groove body 260 faces the first valve needle 210 and is closed by the first valve needle 210, and drainage holes 261 are provided on the groove wall of the drainage groove body 260. The transverse channel 2103 is connected to the valve cavity 101 through the cavity of the drainage groove body 260 and the drainage holes 261. Through the above structural design, since the transverse channel 2103 can be connected to the valve cavity 101 through the cavity of the drainage groove body 260 and the drainage holes 261, the fluid can flow to the cavity of the drainage groove body 260 through the drainage holes 261, and then flow to the transverse channel 2103 through the cavity of the drainage groove body 260. Due to the presence of the drainage groove body 260, the present disclosure does not need to arrange the drainage holes 261 and the transverse channels 2103 in one-to-one correspondence, thereby reducing the processing difficulty of arranging the transverse channels 2103 in the spool assembly 200 and improving the processing convenience.

[0077] Exemplary embodiments of the electronic expansion valve proposed by the present disclosure have been described and / or illustrated in detail above. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from the other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with the other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", and "the above", etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including", and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. In addition, the terms "first", "second", etc. in the claims and the specification are only used as labels and are not numerical limitations on their objects.

[0078] Although the electronic expansion valve proposed by the present disclosure has been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the embodiments of the present disclosure within the spirit and scope of the claims.

Claims

1. An electronic expansion valve, characterized in that, Comprising: A valve seat assembly (100) with a valve cavity (101) formed inside, and a first valve port (1011) is provided in the valve cavity (101); A valve core assembly (200), comprising: A first valve needle (210) disposed in the valve cavity (101); One end of the first valve needle (210) is in sealing cooperation with the first valve port (1011), and a transverse channel (2103) and a second valve port (2102) that are connected and communicated are provided inside the first valve needle (210); the extending direction of the transverse channel (2103) is perpendicular to the axial direction, and at least one end of it opens on the side surface of the first valve needle (210); A second valve needle (220) that is in sealing cooperation with the second valve port (2102); and A drainage groove body (260) disposed on the outer periphery of the first valve needle (210), the notch of the drainage groove body (260) faces the first valve needle (210) and is closed by the first valve needle (210), a drainage hole (261) is provided on the groove wall of the drainage groove body (260), and the transverse channel (2103) is connected and communicated with the valve cavity (101) through the cavity of the drainage groove body (260) and the drainage hole (261).

2. The electronic expansion valve according to claim 1, wherein The groove wall of the drainage groove body (260) includes a bottom wall (2601) that is radially away from the first valve needle (210), and the drainage hole (261) is provided on the bottom wall (2601) so that fluid flows radially between the drainage groove body (260) and the valve cavity (101).

3. The electronic expansion valve according to claim 2, wherein, At least two drainage holes (261) are provided on the bottom wall (2601) of the drainage groove body (260).

4. The electronic expansion valve according to claim 1, wherein The width of the cavity of the drainage groove body (260) along the axial direction is greater than the width of the transverse channel (2103) along the axial direction.

5. The electronic expansion valve according to claim 1, characterized in that The drainage groove body (260) has an annular groove structure and is arranged around the outer periphery of the first valve needle (210).

6. The electronic expansion valve according to any one of claims 1 to 5, characterized in that, The second valve port (2102) is located at the axial center position of the first valve needle (210), and the extending direction of the transverse channel (2103) is the radial direction of the first valve needle (210).

7. The electronic expansion valve according to claim 6, characterized in that At least one transverse channel (2103) is provided on the first valve needle (210), the transverse channel (2103) penetrates the first valve needle (210) in the radial direction, both ends of the transverse channel (2103) open on the side surface of the first valve needle (210), and the second valve port (2102) is communicated with the middle position of the transverse channel (2103).

8. The electronic expansion valve according to claim 6, wherein, One end of the transverse channel (2103) opens on the side surface of the first valve needle (210), and the other end is communicated with the second valve port (2102).

9. The electronic expansion valve according to claim 8, wherein, At least two transverse channels (2103) are provided on the first valve needle (210), and the other ends of at least two transverse channels (2103) converge at one place and are jointly communicated with the second valve port (2102).

10. The electronic expansion valve according to claim 9, characterized in that, At least two transverse channels (2103) are evenly arranged along the circumferential direction of the first valve needle (210).

11. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: At least one of the drainage holes (261) corresponds to at least one of the transverse channels (2103) in the circumferential direction; and / or At least one of the drainage holes (261) is offset from at least one of the transverse channels (2103) in the circumferential direction.

12. The electronic expansion valve according to any one of claims 1 to 5, characterized in that, The first valve needle (210) includes a first assembly body (211) and a second assembly body (212) that are separately arranged and connected to each other. A groove is provided on one side of the first assembly body (211) facing the first valve port (1011). The groove and one side of the second assembly body (212) facing away from the first valve port (1011) together form a flow cavity (2101).

13. The electronic expansion valve according to claim 12, characterized in that, The drainage groove body (260) is located at one end of the first assembly body (211) close to the first valve port (1011).

14. The electronic expansion valve according to any one of claims 1 to 5, characterized in that, A first sealing ring (231) is provided on the outer periphery of the first valve needle (210). The material hardness of the first sealing ring (231) is less than the material hardness of the first valve port (1011). When the first valve port (1011) is closed, the first sealing ring (231) contacts the first valve port (1011) to achieve soft sealing. Among them, a sealing boss (2121) is provided on the periphery of one end of the first valve needle (210) close to the first valve port (1011). The drainage groove body (260) is spaced apart on one side of the sealing boss (2121) axially away from the first valve port (1011). The first sealing ring (231) is axially clamped between the drainage groove body (260) and the sealing boss (2121).

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