Electronic expansion valve

Abstract

An electronic expansion valve, comprising: a valve seat assembly (100), a valve core assembly (200) and a driving assembly (400). A valve chamber (101) is provided inside the valve seat assembly (100), and the valve chamber (101) is provided with a first valve port (1011); the valve core assembly (200) comprises: a first valve pin (210) and a second valve pin (220); the first valve pin (210) is arranged in the valve chamber (101); one end part of the first valve pin (210) is in sealing fit with the first valve port (1011); the first valve pin (210) is internally provided with a flow chamber (2101), a transverse channel (2103), a second valve port (2102) and a longitudinal channel (2104); the flow chamber (2101) is located on the sides of the transverse channel (2103) and the longitudinal channel (2104) facing away from the first valve port (1011); at least one end of the transverse channel (2103) is open at a side surface of the first valve pin (210); one end of the second valve port (2102) leads to the flow chamber (2101), and the other end thereof leads to the transverse channel (2103); one end of the longitudinal channel (2104) is open at the end surface of the first valve pin (210) facing the first valve port (1011), and the other end thereof leads to the flow chamber (2101); the second valve pin (220) is partially inserted into the flow chamber (2101); the end part of the second valve pin (220) facing the first valve port (1011) is in sealing fit with the second valve port (2102); the driving assembly (400) is used for driving the first valve pin (210) and the second valve pin (220) to move in the axial direction, so as to control the opening and closing of the first valve port (1011) and the second valve port (2102).

Description

Electronic expansion valve

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese application No. 2024113539381 filed on September 26, 2024, Chinese application No. 2024223627948 filed on September 26, 2024, Chinese application No. 2024223700939 filed on September 26, 2024, and Chinese application No. 2024223676588 filed on September 26, 2024, the contents of which are incorporated herein in their entirety or in part by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of valves, and in particular to an electronic expansion valve. BACKGROUND

[0004] The electronic expansion valve is used as a throttling element to regulate the on-off and flow rate of fluid. In the existing design scheme of the electronic expansion valve, a valve core assembly of the electronic expansion valve is arranged in a 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 a large valve port of the valve cavity to realize the opening and closing of the large valve port. The large valve needle is provided with a transverse channel and a longitudinal channel. The large valve needle is also provided with a small valve port, and the small valve needle is partially arranged in the large valve needle and used to cooperate with the small valve port to realize the opening and closing of the small valve port.

[0005] In the above-mentioned existing scheme, the large valve needle is internally provided with a valve needle cavity, and the valve needle cavity is provided with the small valve port. The two ends of the small valve port are respectively communicated with the valve needle cavity and the large valve port. In addition, the large valve needle is internally provided with the transverse channel, and the fluid in the valve cavity can enter the valve needle cavity through the transverse channel. The balance channel penetrates the large valve needle along the valve axis. In use, to avoid the situation that the fluid in the valve needle cavity flows out of the large valve needle through the gap between the small valve needle and the large valve needle and the balance channel in sequence when the small valve port is closed, resulting in the failure of the fluid to be shut off, a sealing member needs to be arranged between the large valve needle and the small valve needle. However, the arrangement of the sealing member often increases the overall processing difficulty.

[0006] Therefore, how to simplify the structural complexity of the electronic expansion valve adopting the double-valve needle design has become an important topic to be solved in the related field. SUMMARY

[0007] The technical problem to be solved by the present disclosure is how to provide an electronic expansion valve with relatively simple structure.

[0008] In order to achieve the above object, the present disclosure provides an electronic expansion valve, which comprises a valve seat assembly, a valve core assembly and a driving assembly. The valve seat assembly is internally provided with a valve cavity, and the valve cavity is provided with a first valve port. The valve core assembly comprises a first valve needle and a second valve needle. The first valve needle is arranged in the valve cavity. One end of the first valve needle is in sealing cooperation with the first valve port. The first valve needle is internally provided with a flow-through cavity, a transverse channel, a second valve port and a longitudinal channel. The flow-through cavity is located on the side of the transverse channel and the longitudinal channel away from the first valve port. At least one end of the transverse channel is open to the side surface of the first valve needle. One end of the second valve port is communicated with the flow-through cavity, and the other end is communicated with the transverse channel. One end of the longitudinal channel is open to the end surface of the first valve needle facing the first valve port, and the other end is communicated with the flow-through cavity. The second valve needle is partially inserted into the flow-through cavity, and one end of the second valve needle facing the first valve port is in sealing cooperation with the second valve port. The driving assembly is used to drive the first valve needle and the second valve needle to move in the axial direction, so as to realize the opening and closing control of the first valve port and the second valve port.

[0009] According to one of the embodiments of the present disclosure, the first valve needle comprises a first assembly body and a second assembly body arranged separately and connected with each other. The side of the first assembly body facing the first valve port is provided with a groove, and the groove and the side of the second assembly body away from the first valve port jointly form the flow-through cavity. The transverse channel, the second valve port and the longitudinal channel are arranged in the second assembly body.

[0010] According to one of the embodiments of the present disclosure, a valve core sealing ring is arranged between the first valve needle and the valve seat assembly. The part of the valve cavity on the side of the valve core sealing ring away from the first valve port is a back pressure cavity. The first valve needle is provided with a balance channel, and two ends of the balance channel are respectively communicated with the first valve port and the back pressure cavity. The balance channel comprises the longitudinal channel and a flow-through channel arranged in the first valve needle. One end of the flow-through channel is communicated with the flow-through cavity, and the other end is open and communicated with the back pressure cavity.

[0011] According to one of the embodiments of the present disclosure, wherein: the valve core sealing ring is arranged on the first valve needle; the circular area corresponding to the sealing area between the valve core sealing ring and the valve seat assembly is S1, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S1=S3+S4; or, the valve core sealing ring is arranged on the valve seat assembly; the circular area corresponding to the sealing area between the valve core sealing ring and the first valve needle is S2, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S2=S3+S4.

[0012] According to one of the embodiments of the present disclosure, wherein: the valve core sealing ring is arranged on the first valve needle; the circular area corresponding to the sealing area between the valve core sealing ring and the valve seat assembly is S1, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S1=S3+S4; or, the valve core sealing ring is arranged on the valve seat assembly; the circular area corresponding to the sealing area between the valve core sealing ring and the first valve needle is S2, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S2=S3+S4.

[0013] According to one of the embodiments of the present disclosure, wherein: the valve core sealing ring is arranged on the first valve needle; the circular area corresponding to the sealing area between the valve core sealing ring and the valve seat assembly is S1, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S1=S3+S4; or, the valve core sealing ring is arranged on the valve seat assembly; the circular area corresponding to the sealing area between the valve core sealing ring and the first valve needle is S2, the circular area corresponding to the sealing area between the first valve needle and the first valve port is S3, and the circular area corresponding to the sealing area between the second valve needle and the second valve port is S4; wherein S2=S3+S4.

[0014] According to one of the embodiments of the present disclosure, the first valve needle is provided with a through hole for the second valve needle to pass through; wherein the flow passage and the through hole are connected in the circumferential direction to form an integrated hole structure, or the flow passage and the through hole are arranged in a spaced manner.

[0015] According to one of the embodiments of the present disclosure, the second valve port is located at the center of the first valve needle, and the extending direction of the transverse channel is the radial direction of the first valve needle; the first valve needle is provided with at least one transverse channel, the transverse channel penetrates the first valve needle in the radial direction, and both ends of the transverse channel are open to the side surface of the first valve needle; and the second valve port is connected to the middle position of the transverse channel.

[0016] According to one of the embodiments of the present disclosure, the number of longitudinal channels on both sides of the transverse channel is equal; wherein a reference plane parallel to the radial direction and perpendicular to the axial direction is defined, and the orthogonal projection of the longitudinal channels on both sides of the transverse channel on the reference plane is arranged in axial symmetry, and the symmetry axis is the center line of the orthogonal projection of the transverse channel.

[0017] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a first elastic member connected between the end of the first valve needle away from the first valve port and the valve seat assembly; wherein the end of the first valve needle away from the first valve port is provided with a receiving groove, and the first elastic member is partially accommodated in the receiving groove.

[0018] According to one of the embodiments of the present disclosure, the electronic expansion valve further comprises a second elastic member; wherein the driving assembly comprises a first screw rod and a spring sleeve; the second valve needle is fixedly connected with the spring sleeve, and the spring sleeve is limitingly connected with the first screw rod and can move axially relative to the spring sleeve; the second elastic member is located in the spring sleeve and between the second valve needle and the first screw rod; or the electronic expansion valve further comprises a support seat connected with the valve seat assembly; the driving assembly comprises a second screw rod, the second elastic member is sleeved on the outer periphery of the second screw rod and located between the support seat and the second screw rod.

[0019] According to one of the embodiments of the present disclosure, a first sealing structure is arranged between the end of the first valve needle facing the first valve port and the first valve port, and the first sealing structure comprises a first sealing ring, the material hardness of the first sealing ring is less than the material hardness of the first valve port; wherein when the first valve port is closed, the first valve needle is in contact with the first valve port through the first sealing ring.

[0020] According to one of the embodiments of the present disclosure, when the first valve port is closed, the first valve needle is directly in contact with the first valve port.

[0021] According to one of the embodiments of the present disclosure, the second valve port is provided with a second sealing ring, the material hardness of the second sealing ring is less than the material hardness of the second valve needle; when the second valve port is closed, the second sealing ring is in contact with the second valve needle; or the end of the second valve needle facing the first valve needle is provided with a sealing head, the material hardness of the sealing head is less than the material hardness of the second valve port; when the second valve port is closed, the sealing head is in contact with the second valve port to achieve soft sealing; or when the second valve port is closed, the second valve needle is directly in contact with the second valve port.

[0022] According to one of the embodiments of the present disclosure, the valve core assembly comprises a drainage groove body; the drainage groove body is arranged on the first valve needle, the groove opening of the drainage groove body faces part of the first valve needle and is closed by the part of the first valve needle, the groove wall of the drainage groove body is provided with drainage holes, at least one of the drainage holes corresponds to or is staggered with the position of at least one of the transverse channels in the circumferential direction; the transverse channels are communicated with the valve cavity through the groove cavity of the drainage groove body and the drainage holes; the groove wall of the drainage groove body comprises a bottom wall, and the drainage holes are arranged on the bottom wall to enable the fluid to flow in the radial direction between the drainage groove body and the valve cavity.

[0023] According to one of the embodiments of the present disclosure, the first valve needle is provided with at least two transverse channels, and the other ends of the at least two transverse channels are merged together and are commonly communicated with the second valve port.

[0024] According to one of the embodiments of the present disclosure, the first valve needle comprises a first assembly body and a second assembly body arranged separately and connected to each other, one side of the first assembly body facing the first valve port is provided with a groove, and the groove and one side of the second assembly body away from the first valve port together form a flow cavity; wherein the drainage groove body is located at one end of the first assembly body close to the first valve port.

[0025] According to one of the embodiments of the present disclosure, the outer periphery of the first valve needle is provided with a first sealing ring, the material hardness of the first sealing ring is less than the material hardness of the first valve port, and when the first valve port is closed, the first sealing ring is in contact with the first valve port to achieve soft sealing; wherein the periphery of one end of the first valve needle close to the first valve port is provided with a sealing boss, the drainage groove body is located on one side of the sealing boss away from the first valve port in the axial direction, and the first sealing ring is clamped between the drainage groove body and the sealing boss in the axial direction.

[0026] According to one of the embodiments of the present disclosure, the first valve needle is provided with a guide portion located at the opening of the flow cavity and having a guide surface; the guide surface matches the shape of at least part of the outer periphery of the second valve needle to guide the second valve needle; the drive assembly includes a first screw rod connected to the second valve needle, and the first screw rod can drive the second valve needle to move axially relative to the first valve needle to realize the opening and closing control of the first valve port and the second valve port.

[0027] According to one of the embodiments of the present disclosure, a valve core sealing ring is arranged between the first valve needle and the valve seat assembly, and the valve cavity is located at the portion of the valve core sealing ring away from the first valve port, which is a back pressure cavity; the first valve needle is provided with a balance channel, and the two ends of the balance channel are respectively communicated with the first valve port and the back pressure cavity; the gap between the guide surface and the second valve needle is respectively communicated with the back pressure cavity and the flow cavity.

[0028] According to one of the embodiments of the present disclosure, the balance channel includes a flow channel and a longitudinal channel arranged in the first valve needle, the flow cavity is located between the flow channel and the longitudinal channel, and the flow channel is communicated with the flow cavity and the back pressure cavity; the longitudinal channel is communicated with the first valve port and the flow cavity.

[0029] According to one of the embodiments of the present disclosure, in the circumferential direction, the portion between the second valve needle and the opening of the flow cavity which is not occupied by the guide portion forms the flow channel.

[0030] According to one of the embodiments of the present disclosure, the valve core assembly includes at least two guide portions arranged in the circumferential direction and forming at least two flow channels arranged in the circumferential direction at intervals.

[0031] According to one of the embodiments of the present disclosure, the guide portion has a ring structure, a guide hole is formed in the middle of the guide portion, the hole wall of the guide hole is the guide surface, and the second valve needle is arranged in the guide hole; wherein the flow channel is arranged in the guide portion and penetrates the guide portion in the axial direction.

[0032] According to one of the embodiments of the present disclosure, the flow channel is a through hole, and the through hole is arranged at intervals with the guide hole.

[0033] According to one of the embodiments of the present disclosure, the flow channel is a through slot, and the slot opening of the through slot is communicated with the guide hole.

[0034] The beneficial effects of the present disclosure mainly include:

[0035] The electronic expansion valve provided by the present disclosure comprises a valve seat assembly and a valve core assembly; the valve cavity of the valve seat assembly is provided with a first valve port; the valve core assembly comprises a first valve needle and a second valve needle; one end of the first valve needle is in sealing cooperation with the first valve port; the first valve needle is internally provided with a flow-through cavity, a transverse channel, a second valve port and a longitudinal channel; the flow-through cavity is located on the side of the longitudinal channel away from the first valve port; one end of the transverse channel is open on the side surface of the first valve needle; one end of the second valve port is communicated with the flow-through cavity, and the other end is communicated with the transverse channel; one end of the longitudinal channel is open on the end surface of the first valve needle facing the first valve port, and the other end is communicated with the flow-through cavity; part of the second valve needle is inserted into the flow-through cavity, and one end of the second valve needle facing the first valve port is in sealing cooperation with the second valve port. Through the above design, when the second valve port is opened, the present disclosure can realize that the throttling refrigerant first flows through the flow-through cavity of the first valve needle and then flows out of the first valve port, thereby enabling the second valve needle to realize a non-inner balance structure. Compared with the existing scheme in which a small valve needle adopts an inner balance structure, the present disclosure can utilize the longitudinal channel as a flow-through path and a balance channel at the same time, thereby avoiding that the longitudinal channel is blocked by the oil in the valve cavity. At the same time, since the second valve needle adopts the above non-inner balance structure, that is, the transverse channel, the second valve port, the flow-through cavity and the longitudinal channel are sequentially communicated to form a flow-through path of fluid. On this basis, since one end of the second valve port is open towards the flow-through cavity rather than towards the first valve port, when the second valve port is closed, even if there is no sealing element between the second valve needle and the first valve needle, the fluid entering the first valve needle will be shut off by the second valve needle, ensuring that the flow rate of the second valve port is zero flow rate. Accordingly, it is possible to avoid setting an additional sealing element between the first valve needle and the second valve needle, to reduce the number of components of the electronic expansion valve, and to reduce the structural complexity. Since the setting of the above sealing element is avoided, the present disclosure also does not need to weld a corresponding pressing sheet, can reduce the welding process, and is conducive to improving the production efficiency of the product. BRIEF DESCRIPTION OF DRAWINGS

[0036] FIG. 1 is a perspective structural schematic view of an electronic expansion valve according to an exemplary embodiment;

[0037] FIG. 2 is a bottom view of FIG. 1;

[0038] FIGS. 3 and 4 are cross-sectional schematic views taken along straight lines A-A and B-B in FIG. 2, respectively;

[0039] FIGS. 5 and 6 are enlarged cross-sectional structural schematic views of the valve core assembly shown in FIGS. 3 and 4, respectively;

[0040] FIG. 7 is a perspective structural schematic view of the valve core assembly shown in FIGS. 3 and 4;

[0041] FIG. 8 is a perspective structural schematic view of part of the components shown in FIG. 7;

[0042] FIGS. 9 and 10 are perspective exploded schematic views of FIG. 8 from two different perspectives, respectively;

[0043] Fig. 11 is a perspective structural schematic view of a second assembly of an electronic expansion valve according to another exemplary embodiment;

[0044] Fig. 12 is a cross-sectional schematic view of the second assembly of the electronic expansion valve according to another exemplary embodiment;

[0045] Fig. 13 is a partial cross-sectional schematic view of the electronic expansion valve according to another exemplary embodiment;

[0046] Figs. 14 and 15 are cross-sectional schematic views of a valve core assembly of the electronic expansion valve according to two other exemplary embodiments, respectively;

[0047] Fig. 16 is a cross-sectional schematic view of the electronic expansion valve according to another exemplary embodiment;

[0048] Fig. 17 is an enlarged schematic view of a portion C in Fig. 16;

Replaced by Fig. 3 of 2024223627948 case

[0049] Fig. 18 is a cross-sectional schematic view of the electronic expansion valve according to another exemplary embodiment;

[0050] Fig. 19 is an enlarged schematic view of a portion E in Fig. 18;

[0051] Fig. 20 is a cross-sectional schematic view of the electronic expansion valve according to another exemplary embodiment;

Replaced by Fig. 3 of 2024223676588 case

[0052] Fig. 21 is an enlarged schematic view of a portion structure shown in Fig. 20;

[0053] Fig. 22 is a perspective structural schematic view of a valve core assembly of the electronic expansion valve shown in Fig. 20;

[0054] Fig. 23 is a perspective structural schematic view of a first assembly shown in Fig. 22;

[0055] Fig. 24 is a perspective structural schematic view of a portion member of the electronic expansion valve shown in Fig. 1;

[0056] Fig. 25 is a perspective exploded sectional view of Fig. 24;

[0057] Fig. 26 is a perspective structural schematic view of a valve core sleeve shown in Fig. 24;

[0058] Fig. 27 is a perspective structural schematic view of a valve core sleeve of the electronic expansion valve according to another exemplary embodiment;

[0059] Fig. 28 is a perspective structural schematic view of the electronic expansion valve according to another exemplary embodiment;

[0060] FIG. 29 is a sectional view of an electronic expansion valve;

[0061] FIG. 30 is a structural schematic view of a rotor assembly and a guide rod;

[0062] FIG. 31 is a partially exploded view of an electronic expansion valve;

[0063] FIG. 32 is a structural schematic view of a guide seat;

[0064] FIG. 33 is a schematic view of a mounting position of the guide seat;

[0065] FIG. 34 is a structural schematic view of a first seat body;

[0066] FIG. 35 is another structural schematic view of the guide seat;

[0067] FIG. 36 is a perspective structural schematic view of an electronic expansion valve according to an exemplary embodiment;

[0068] FIG. 37 is a perspective structural schematic view of a spool assembly of the electronic expansion valve shown in FIG. 36;

[0069] FIG. 38 is an axial sectional view of FIG. 37;

[0070] FIG. 39 is a perspective exploded schematic view of FIG. 37;

[0071] FIG. 40 is a perspective structural schematic view of a spool sleeve shown in FIG. 37;

[0072] FIG. 41 is an axial sectional view of FIG. 40;

[0073] FIG. 42 is a cross-sectional schematic view of the spool assembly shown in FIG. 37;

[0074] FIG. 43 is a bottom view of FIG. 1;

[0075] FIG. 44 is a cross-sectional schematic view taken along the line Q-Q in FIG. 43;

[0076] FIG. 45 is an enlarged schematic view of a portion of the structure shown in FIG. 20;

[0077] FIG. 46 is a top view of FIG. 23;

[0078] FIG. 47 is a perspective sectional view taken along the line F-F in FIG. 46;

[0079] FIG. 48 is a top view of a first valve needle of an electronic expansion valve according to another exemplary embodiment;

[0080] FIG. 49 is a top view of a first valve needle of an electronic expansion valve according to another exemplary embodiment. DETAILED DESCRIPTION

[0081] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and detailed descriptions of the figures are omitted as such.

[0082] Referring to FIG. 1, a perspective structural schematic diagram of an electronic expansion valve according to the present disclosure is shown. In the example implementation, the electronic expansion valve according to 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 various modifications, additions, substitutions, deletions, or other changes can be made to the specific implementation described below in order to apply the relevant design of the present disclosure to other application scenarios, and such changes are still within the scope of the principle of the electronic expansion valve according to the present disclosure.

[0083] As shown in FIG. 1, in an embodiment of the present disclosure, the electronic expansion valve according to the present disclosure includes a valve seat assembly 100, a valve core assembly 200, and a driving assembly 400. For reference, FIG. 2 shows a bottom view of FIG. 1, FIG. 3 shows a sectional view along the straight line A-A in FIG. 2, FIG. 4 shows a sectional view along the straight line B-B in FIG. 2, FIG. 5 shows an enlarged sectional view of the valve core assembly 200 in FIG. 3, FIG. 6 shows an enlarged sectional view of the valve core assembly 200 in FIG. 4, FIG. 7 shows a perspective structural schematic diagram of the valve core assembly 200, FIG. 8 shows a perspective structural schematic diagram of part of the components (e.g., the second assembly 212 and the sealing head 242) shown in FIG. 7, and FIGS. 9 and 10 show perspective exploded schematic diagrams of FIG. 8 from two different angles, respectively. The structure, connection mode, and functional relationship of the main components of the electronic expansion valve according to the present disclosure will be described in detail below with reference to the above-mentioned figures.

[0084] As shown in FIGS. 1-9, in an embodiment of the present disclosure, a valve seat assembly 100 is provided with a valve cavity 101, which is provided with a first valve port 1011. A valve core assembly 200 includes a first valve needle 210 and a second valve needle 220. The first valve needle 210 is arranged in the valve cavity 101, and one end of the first valve needle 210 is in sealing cooperation with the first valve port 1011. The first valve needle 210 is internally provided with a flow passage 2101, a transverse channel 2103, a second valve port 2102, and a longitudinal channel 2104. The flow passage 2101 is located on the side of the transverse channel 2103 and the longitudinal channel 2104 away from the first valve port 1011. The transverse channel 2103 is open at least at one end to the side surface of the first valve needle 210. One end of the second valve port 2102 is in communication with the flow passage 2101, and the other end of the second valve port 2102 is in communication with the transverse channel 2103. One end of the longitudinal channel 2104 is open to the end surface of the first valve needle 210 facing the first valve port 1011, and the other end of the longitudinal channel 2104 is in communication with the flow passage 2101, whereby the longitudinal channel 2104 can be used as both a balance channel and a flow passage. The second valve needle 220 is partially inserted into the flow passage 2101, for example, in actual installation, the second valve needle 220 can be inserted outward from the flow passage 2101. One end of the second valve needle 220 facing the first valve port 1011 is in sealing cooperation with the second valve port 2102. A drive assembly 400 is used to drive the first valve needle 210 and the second valve needle 220 to move axially to achieve opening and closing control of the first valve port 1011 and the second valve port 2102. For example, the drive assembly 400 can be arranged in a housing 500 and located at the end of the valve seat assembly 100 away from the first valve port 1011. Through the above design, when the second valve port 2102 is opened, the present disclosure can realize that the throttling refrigerant first flows through the flow passage 2101 of the first valve needle 210 and then flows out of the first valve port 1011, for example, the throttling refrigerant flows through the transverse channel 2103, the second valve port 2102, the flow passage 2101, the longitudinal channel 2104, and the first valve port 1011 in sequence, that is, forward flow. The present disclosure can also realize reverse flow, that is, the throttling refrigerant flows through the first valve port 1011, the longitudinal channel 2104, the flow passage 2101, the second valve port 2102, and the transverse channel 2103 in sequence. Compared with the existing scheme of using an inner balance structure for a small valve needle, the present disclosure can use the longitudinal channel 2104 as both a flow passage and a balance channel, thereby avoiding that the longitudinal channel 2104 is blocked by oil in the valve cavity 101. At the same time, the present disclosure sequentially connects the transverse channel 2103, the second valve port 2102, the flow passage 2101, and the longitudinal channel 2104 to form a flow passage for fluid.On this basis, since one end of the second valve port 2102 is open towards the flow-through cavity 2101 instead of the first valve port 1011, when the second valve port 2102 is closed, even if there is no sealing element between the second valve needle 220 and the first valve needle 210, the fluid entering the first valve needle 210 will be shut off by the second valve needle 220, ensuring that the flow of the second valve port 2102 is zero flow, thereby avoiding the need to set an additional sealing element between the first valve needle 210 and the second valve needle 220, reducing the number of components of the electronic expansion valve, and reducing the structural complexity. Since the above-mentioned sealing element is avoided, the present disclosure also does not need to weld the corresponding pressure plate for fixing the sealing element, thereby reducing the welding process and improving the production efficiency of the product.

[0085] As shown in FIGS. 5-7, in an embodiment of the present disclosure, the first valve needle 210 includes a first assembly body 211 and a second assembly body 212 which are separately arranged and connected to each other. The first assembly body 211 is provided with a groove on the side facing the first valve port 1011, and the groove and the side of the second assembly body 212 away from the first valve port 1011 together form the flow-through cavity 2101 described above. The transverse channel 2103, the second valve port 2102, and the longitudinal channel 2104 are arranged in the second assembly body 212.

[0086] As shown in FIGS. 3-7, in an embodiment of the present disclosure, a valve core sealing ring 213 can be arranged between the first valve needle 210 and the valve seat assembly 100. The portion of the valve cavity 101 away from the first valve port 1011 is a back pressure cavity 1014. The first valve needle 210 is provided with a balance channel, both ends of which are communicated with the first valve port 1011 and the back pressure cavity 1014, respectively. The balance channel includes the longitudinal channel 2104 described above and a flow-through channel 2105 arranged in the first valve needle 210. One end of the flow-through channel 2105 is communicated with the flow-through cavity 2101, and the other end of the flow-through channel 2105 is open and communicated with the back pressure cavity 1014. Through the above design, the present disclosure can realize the internal balance structure design of the first valve needle 210, and the back pressure cavity 1014 and the first valve port 1011 are communicated through the balance channel, thereby reducing the force of the fluid acting on the first valve needle 210.

[0087] In an embodiment of the present disclosure, the first assembly body 211 and the second assembly body 212 can be connected by, for example, crimping, welding, or the like, 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 transverse channel 2103, the second valve port 2102, and the longitudinal channel 2104 are arranged 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, and the formation of the channels and cavities of the first valve needle 210 can be realized by using a smaller number of components and a simpler component structure, and the structure is more reasonable and convenient for processing and assembly.

[0088] In an embodiment of the present disclosure, the valve core sealing ring 213 can be arranged on the first valve needle 210, for example, as shown in FIGS. 5 and 6, the valve core sealing ring 213 is arranged in the sealing groove on the outer periphery of the first valve needle 210. At this time, the circular area corresponding to the sealing area between the valve core sealing ring 213 and the valve seat assembly 100 is defined as S1. In addition, the circular area corresponding to the sealing area between the first valve needle 210 and the first valve port 1011 is defined as S3, and the circular area corresponding to the sealing area between the second valve needle 220 and the second valve port 2102 is defined as S4. Then, S1=S3+S4. In other embodiments of the present disclosure not shown in the drawings, the valve core sealing ring 213 can also be arranged on the valve seat assembly 100. At this time, the circular area corresponding to the sealing area between the valve core sealing ring 213 and the first valve needle 210 is defined as S2. On this basis, taking the above definitions of S3 and S4 as an example, S2=S3+S4. Based on the above design, the valve core assembly 200 can be used in both forward and reverse directions, that is, bidirectional flow. The above relationship can make the fluid force acting on the first valve needle 210 in the inner balance design approach zero, avoiding the action force of the inlet and outlet fluid of the electronic expansion valve on the first valve needle 210, and avoiding the first valve needle 210 in the closed state being lifted up due to the large action force.

[0089] Different from the above area relationship design, in other embodiments of the present disclosure, other area relationship designs can also be used. For example, when the fluid of the electronic expansion valve is side-in and bottom-out (i.e. forward fluid), the circular area corresponding to the sealing area between the first valve needle 210 and the first valve port 1011 (i.e. S3 in the above description) can be increased. On this basis, taking the valve core sealing ring 213 arranged on the first valve needle 210 as an example, S1<S3+S4. Or, taking the valve core sealing ring 213 arranged on the valve seat assembly 100 as an example, S2<S3+S4. Through the above design, the present disclosure can make the inlet and outlet fluid act on the first valve needle 210, and use the action force to close the first valve port 1011 to avoid leakage of the first valve port 1011. For another example, when the fluid of the electronic expansion valve is bottom-in and side-out (i.e. reverse fluid), the circular area corresponding to the sealing area between the first valve needle 210 and the first valve port 1011 (i.e. S3 in the above description) can be reduced. On this basis, taking the valve core sealing ring 213 arranged on the first valve needle 210 as an example, S1>S3+S4. Or, taking the valve core sealing ring 213 arranged on the valve seat assembly 100 as an example, S2>S3+S4. Through the above design, the present disclosure can also make the inlet and outlet fluid act on the first valve needle 210, and use the action force to close the first valve port 1011 to avoid leakage of the first valve port 1011.

[0090] As shown in FIG. 7, in an embodiment of the present disclosure, the first valve needle 210 can be provided with a through hole 2106 capable of allowing the second valve needle 220 to pass through. On this basis, the flow passage 2105 of the first valve needle 210 and the through hole 2106 can be in communication in the circumferential direction to form an integrated hole structure. Through the above design, since the flow passage 2105 and the through hole 2106 adopt an integrated hole structure, the present disclosure can simplify the structural complexity of the first valve needle 210 and reduce the processing difficulty. On this basis, while the flow passage 2105 is used to communicate the valve cavity 101 and the flow cavity 2101, the present disclosure can avoid the second valve needle 220 entering the flow passage 2105, ensure the cooperation of the second valve needle 220 and the through hole 2106, and improve the stability and reliability of the relative movement of the second valve needle 220 and the first valve needle 210.

[0091] As shown in FIG. 7, based on the design that the first valve needle 210 is provided with the through hole 2106 and the through hole 2106 and the flow passage 2105 form an integrated hole structure, in an embodiment of the present disclosure, the first valve needle 210 can be provided with at least two flow passages 2105, for example but not limited to two flow passages 2105 shown in the figure, and these flow passages 2105 can be uniformly distributed along the circumferential direction of the through hole 2106. Through the above design, the present disclosure can improve the balance of the fluid flowing between the valve cavity 101 and the flow cavity 2101 via the flow passage 2105, and at the same time can make the stress of the first valve needle 210 more uniform, further ensuring the stable stress of the component.

[0092] In an embodiment of the present disclosure, the flow area of the transverse channel 2103 can be equal to the flow area of the longitudinal channel 2104, ensuring the consistency of the forward and reverse flow curves when flowing forward and reverse. Specifically, the above-mentioned relationship of the flow area is for the comparison of all transverse channels 2103 and all longitudinal channels 2104, that is, the sum of the flow areas of all transverse channels 2103 (when the transverse channel 2103 is one, it is the flow area of a single transverse channel 2103) is equal to the sum of the flow areas of all longitudinal channels 2104 (when the longitudinal channel 2104 is one, it is the flow area of a single transverse channel 2103).

[0093] As shown in FIGS. 3 to 6, in an embodiment of the present disclosure, the second valve port 2102 can be located at the axial center position of the first valve needle 210, and on this basis, the extension direction of the transverse channel 2103 can be the radial direction of the first valve needle 210. In some embodiments, the second valve port 2102 can also be located at other positions of the first valve needle 210, and on this basis, the extension direction of the transverse channel 2103 can be the radial direction of the first valve needle 210, or other directions perpendicular to the axial direction.

[0094] As shown in FIGS. 3-6, based on the design that the extending direction of the lateral passage 2103 is radial, in an embodiment of the present disclosure, the first valve needle 210 can be provided with at least one lateral passage 2103, and the at least one lateral passage 2103 penetrates the first valve needle 210 in the radial direction, i.e., both ends of the at least one lateral passage 2103 are open to the side surface of the first valve needle 210, and the second valve port 2102 is connected to the intermediate position of the lateral passage 2103. In other words, for the above-mentioned lateral passage 2103 penetrating the first valve needle 210 in the radial direction, it can also be understood as two lateral passages 2103, the extending directions of the two lateral passages 2103 are consistent, and the opposite ends of the two lateral passages 2103 are respectively open to the side surface of the first valve needle 210, and the opposite ends of the two lateral passages 2103 are connected together and jointly form the second valve port 2102.

[0095] As shown in FIGS. 3-6, based on the design that the extending direction of the lateral passage 2103 is radial, in an embodiment of the present disclosure, the first valve needle 210 can be provided with one lateral passage 2103, i.e., the lateral passage 2103 penetrates the first valve needle 210 in the radial direction. On this basis, one longitudinal passage 2104 can be arranged on each side of the lateral passage 2103. In other words, due to the fact that the lateral passage 2103 penetrates the first valve needle 210 in the radial direction, the first valve needle 210 is divided into two regions in the circumferential direction by the lateral passage 2103, and accordingly, one longitudinal passage 2104 can be arranged in each region. Through the above-mentioned design, the present disclosure can improve the balance of fluid flow. In some embodiments, when the first valve needle 210 is provided with one lateral passage 2103 penetrating in the radial direction, two or more longitudinal passages 2104 can also be arranged on each side of the lateral passage 2103, and the number of longitudinal passages 2104 arranged on each side of the lateral passage 2103 can be, but is not limited to, equal.

[0096] As shown in FIGS. 2-6, based on the design that at least one longitudinal passage 2104 is arranged on each side of the lateral passage 2103, in an embodiment of the present disclosure, the number of longitudinal passages 2104 arranged on each side of the lateral passage 2103 can be equal, for example, but not limited to, one as shown in the drawings. On this basis, a reference plane parallel to the radial direction and perpendicular to the axial direction is defined, and on the reference plane, the orthogonal projection of the longitudinal passages 2104 arranged on each side of the lateral passage 2103 can be arranged in axial symmetry, and the symmetry axis is the center line of the orthogonal projection of the lateral passage 2103. Through the above-mentioned design, the present disclosure can further improve the balance of fluid flow.

[0097] Referring to FIG. 11, FIG. 11 schematically shows a perspective structural schematic view of a second assembly 212 of an electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment.

[0098] Different from the design of the two embodiments shown in FIGS. 2-6, in which the lateral passage 2103 penetrates the first valve needle 210 along the radial direction, in another embodiment of the present disclosure, as shown in FIG. 11, still taking the first valve needle 210 provided with one lateral passage 2103 penetrating along the radial direction as an example, the first valve needle 210 can be provided with four longitudinal passages 2104, which are distributed on the two sides of the lateral passage 2103 in pairs, and the projections of the four longitudinal passages 2104 are arranged in pairs on the central line of the projection of the lateral passage 2103 as the axis of symmetry.

[0099] Referring to FIG. 12, FIG. 12 schematically shows a cross-sectional view of a second assembly 212 of an electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment.

[0100] Different from the design of the two embodiments shown in FIGS. 2-6, in which the lateral passage 2103 penetrates the first valve needle 210 along the radial direction, in another embodiment of the present disclosure, as shown in FIG. 12, still taking the first valve needle 210 provided with one lateral passage 2103 penetrating along the radial direction as an example, the first valve needle 210 can be provided with four longitudinal passages 2104, which are distributed on the two sides of the lateral passage 2103 in pairs, and the projections of the four longitudinal passages 2104 are arranged in pairs on the central line of the projection of the lateral passage 2103 as the axis of symmetry.

[0101] As shown in FIG. 12, based on the design that the lateral passage 2103 does not penetrate the first valve needle 210, in another embodiment of the present disclosure, the first valve needle 210 can be provided with three lateral passages 2103, each end of which is respectively open to the side surface of the first valve needle 210, and the other end of each of the three lateral passages 2103 converges at one point (e.g., the axis of the first valve needle 210) and is commonly connected to the second valve port 2102. In some embodiments, the first valve needle 210 can also be provided with two, four or more lateral passages 2103 that do not penetrate the first valve needle 210, and is not limited to the above-mentioned embodiments.

[0102] As shown in FIG. 12, based on the design that each end of the at least two lateral passages 2103 commonly communicates with the second valve port 2102, in another embodiment of the present disclosure, the at least two lateral passages 2103 can be uniformly arranged along the circumferential direction of the first valve needle 210. Through the above design, the present disclosure can make the fluid force acting on the second valve needle 220 more uniform, and the overall resultant force of the fluid force smaller, thereby reducing the influence of the fluid force on the second valve needle 220.

[0103] As shown in FIG. 12, based on the design that the lateral passage 2103 does not penetrate the first valve needle 210, in another embodiment of the present disclosure, a longitudinal passage 2104 can be arranged between any two adjacent lateral passages 2103. In other words, since the extension direction of the lateral passage 2103 is the radial direction of the first valve needle 210, at least two lateral passages 2103, each of which has one end meeting together, will divide the first valve needle 210 into at least two regions (for example, three regions as shown in the figure) in the circumferential direction, and accordingly the present disclosure can arrange a longitudinal passage 2104 in each region. Through the above design, the present disclosure can improve the balance of fluid flow. In some embodiments, when the first valve needle 210 is provided with at least two lateral passages 2103 that do not penetrate, the at least two regions of the first valve needle 210 divided by the at least two lateral passages 2103 can also be respectively provided with two or more longitudinal passages 2104, and the number of longitudinal passages 2104 arranged in each region can be but not limited to equal.

[0104] As shown in FIG. 12, based on the design that the lateral passage 2103 does not penetrate the first valve needle 210, in another embodiment of the present disclosure, the first valve needle 210 can be provided with at least three lateral passages 2103, for example but not limited to three lateral passages 2103 as shown in the figure, which can be arranged uniformly along the circumferential direction of the first valve needle 210, and a longitudinal passage 2104 is arranged between any two adjacent lateral passages 2103, and each longitudinal passage 2104 is uniformly distributed in the circumferential direction of the first valve needle 210. Through the above design, the present disclosure can further improve the balance of fluid flow. It should be noted that when the first valve needle 210 is provided with two lateral passages 2103 that do not penetrate and the two lateral passages 2103 are arranged uniformly in the circumferential direction, that is, the extension direction of the two lateral passages 2103 is consistent and can form a structure similar to the lateral passage 2103 in the embodiment shown in FIGS. 3-6.

[0105] As shown in FIG. 3 and FIG. 4, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure can further comprise a first elastic member 410 connected between the end of the first valve needle 210 away from the first valve port 1011 and the valve seat assembly 100 (e.g. the end cavity wall of the valve cavity 101 away from the first valve port 1011). On this basis, the end of the first valve needle 210 (e.g. the first assembly body 211 described above) away from the first valve port 1011 can be provided with a containing groove 2107, and the first elastic member 410 is partially contained in the containing groove 2107. Through the above design, the present disclosure can realize the sealing of the first valve port 1011 in the open state of the second valve port 2102 by the compensation of the first elastic member 410. On this basis, the present disclosure can arrange the first elastic member 410 by the containing groove 2107 to ensure the installation space of the first elastic member 410, while ensuring that the first valve needle 210 has a certain length in the axial direction to ensure that the first valve needle 210 has sufficient length for guiding cooperation with the valve seat assembly 100 (e.g. the valve core sleeve 110).

[0106] As shown in FIG. 3 and FIG. 4, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure can further comprise a second elastic member 420. Specifically, the drive assembly 400 comprises a first screw rod 430 and a spring sleeve 440. The second valve needle 220 is fixedly connected with the spring sleeve 440, and the spring sleeve 440 is limitingly connected with the first screw rod 430 and can move axially relative to the spring sleeve 440. The second elastic member 420 is located in the spring sleeve 440 and between the second valve needle 220 and the first screw rod 430. After the second valve port 2012 is closed, the first screw rod 430 moves relative to the second valve needle 220 in the direction close to the second valve port 2012, the compression degree of the second elastic member 420 increases, and the second valve needle 220 presses the second valve port 2012.

[0107] As shown in FIG. 16, in another embodiment of the present disclosure, after the second valve port 2012 is closed, the first screw rod 430 moves relative to the second valve needle 220 in the direction away from the second valve port 2012, the compression degree of the second elastic member 420 increases, and the second valve needle 220 presses the second valve port 2012.

[0108] As shown in FIGS. 3-8, in an embodiment of the present disclosure, one end of the first valve needle 210 facing the first valve port 1011 can be provided with a first sealing structure, which includes a first sealing ring 231, the material hardness of the first sealing ring 231 being less than that of the first valve port 1011. On this basis, when the first valve port 1011 is closed, the first sealing ring 231 is in contact with the first valve port 1011 to achieve soft sealing. In some embodiments, still taking the design that the first sealing ring 231 is provided between the first valve needle 210 and the first valve port 1011 to achieve soft sealing as an example, the first sealing structure including the first sealing ring 231 can also be provided at the first valve port 1011, according to which when the first valve port 1011 is closed, the first sealing ring 231 is in contact with the first valve needle 210 to achieve soft sealing.

[0109] As shown in FIGS. 5, 6, 9 and 10, based on the design that the first valve needle 210 is provided with the first sealing ring 231, in an embodiment of the present disclosure, the first sealing structure can further include a first pressing piece 232 for pressing the first sealing ring 231 to be assembled at the first valve needle 210. The first pressing piece 232 can be connected to the first valve needle 210 by welding or riveting, etc.

[0110] Referring to FIG. 13, FIG. 13 schematically shows a partial cross-sectional view of an electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment.

[0111] Unlike the design that the first valve needle 210 and the first valve port 1011 are in soft sealing in the embodiments shown in FIGS. 3-6, as shown in FIG. 13, in another embodiment of the present disclosure, when the first valve port 1011 is closed, the first valve needle 210 can be directly in contact with the first valve port 1011, i.e., the first valve needle 210 and the first valve port 1011 are in hard sealing.

[0112] It should be noted that in some embodiments of the present disclosure, regardless of whether the first valve needle 210 and the first valve port 1011 are in soft sealing or hard sealing, the sealing fit between the first valve port 1011 and the first valve needle 210 can be provided in a conical chamfer shape or an arc chamfer shape. The above chamfer shape design can refer to the shape of the first valve needle 210 and the first valve port 1011, or the shape of the first sealing ring 231 and the sealing fit therebetween.

[0113] As shown in FIGS. 5 and 6, in an embodiment of the present disclosure, the outer periphery of the second valve needle 220 can be provided with a transmission portion 221. Specifically, the transmission portion 221 is integrally arranged with the second valve needle 220, and the transmission portion 221 is located in the flow cavity 2101 and has a thickness less than the height of the flow cavity 2101 in the axial direction. On this basis, the driving assembly 400 can drive the second valve needle 220 to move away from the first valve port 1011, so that the transmission portion 221 abuts against the side cavity wall of the flow cavity 2101 away from the first valve port 1011, to drive the first valve needle 210 to move away from the first valve port 1011.

[0114] As shown in FIGS. 5 to 7, based on the design that the second valve needle 220 is provided with the transmission portion 221, in an embodiment of the present disclosure, when the first valve needle 210 is provided with the through hole 2106 (i.e., the guide hole of the guide portion 270) and the through hole 2106 and the flow passage 2105 (e.g., a design of a through groove) adopt an integrated hole structure, the shape of the transmission portion 221 can match the shape of the hole structure, i.e., in the assembly process of the valve core assembly 200, part of the second valve needle 220 protrudes out of the flow cavity 2101, and the maximum outer diameter of the transmission portion 221 is greater than the inner diameter of the through hole 2106, so as to ensure that the part of the second valve needle 220 provided with the transmission portion 221 cannot be axially pulled out of the flow cavity 2101. Through the above design, the present disclosure can reduce the assembly difficulty of the valve core assembly 200 and improve the assembly efficiency.

[0115] As shown in FIGS. 5, 6, 8 and 9, in an embodiment of the present disclosure, the end of the second valve needle 220 facing the first valve needle 210 can be provided with a sealing head 242, and the material hardness of the sealing head 242 is less than that of the second valve port 2102. On this basis, when the second valve port 2102 is closed, the sealing head 242 is in contact with the second valve port 2102 to achieve soft sealing.

[0116] As shown in FIGS. 5 and 6, based on the design that the second valve needle 220 is provided with the sealing head 242, in an embodiment of the present disclosure, the end of the second valve needle 220 facing the first valve needle 210 can be further provided with a second pressing piece 243 for pressing the sealing head 242 to be assembled on the second valve needle 220. The second pressing piece 243 is riveted and fixed with the sealing head 242. Further, the axial cross section of the sealing head 242 can be substantially in the shape of a "T" and has a horizontal part and a vertical part. The horizontal part is pressed against the end of the second valve needle 220 facing the first valve port 1011 by the second pressing piece 243, the second pressing piece 243 is substantially annular and surrounds the vertical part, one end of the vertical part is connected to the horizontal part, and the other end extends axially toward the second valve port 2102, and the sealing head 242 is in sealing cooperation with the second valve port 2102 by the vertical part.

[0117] Referring to FIG. 14, a cross-sectional view of a valve core assembly 200 of an electronic expansion valve embodying principles of the present disclosure in another exemplary embodiment is schematically shown.

[0118] Different from the design of the axial cross-section of the sealing head 242 in the embodiments shown in FIGS. 5 and 6 being in a "T" shape, as shown in FIG. 14, in an embodiment of the present disclosure, still taking the example of the second valve needle 220 being provided with the sealing head 242, the side of the sealing head 242 facing the second valve port 2102 can also be planar, for example, the axial cross-section of the sealing head 242 being rectangular. On this basis, the sealing head 242 is sealed with the second valve port 2102 in a sealing fit by the side of the sealing head 242 facing the second valve port 2102 being planar. Further, the second valve port 2102 can be provided with a sealing protrusion protruding axially towards the second valve needle 220, and the second valve port 2102 penetrates the sealing protrusion, whereby the second valve port 2102 is conducive to the sealing protrusion being sealed with the above-mentioned planar surface of the sealing head 242, and is not limited to the above-mentioned embodiment.

[0119] Referring to FIG. 15, a cross-sectional view of a valve core assembly 200 of an electronic expansion valve embodying principles of the present disclosure in another exemplary embodiment is schematically shown.

[0120] As shown in FIG. 15, in an embodiment of the present disclosure, the end of the second valve port 2102 facing the second valve needle 220 can be provided with a second sealing structure, and the second sealing structure includes a second sealing ring 241, and the material hardness of the second sealing ring 241 is less than the material hardness of the second valve needle 220. On this basis, when the second valve port 2102 is closed, the second sealing ring 241 is in contact with the second valve needle 220 to achieve soft sealing.

[0121] As shown in FIG. 15, based on the design of the second valve port 2102 being provided with the second sealing ring 241, in an embodiment of the present disclosure, the second sealing structure can further include a second pressing piece 243, and the second pressing piece 243 is used to press against the second sealing ring 241 to assemble it at the second valve port 2102.

[0122] Different from the design of the second valve needle 220 and the second valve port 2102 being soft sealed in the embodiments shown in FIGS. 3 to 6 or FIGS. 14 to 15, as shown in FIG. 13, in another embodiment of the present disclosure, when the second valve port 2102 is closed, the second valve needle 220 can be directly in contact with the second valve port 2102, that is, the second valve needle 220 and the second valve port 2102 are hard sealed.

[0123] Referring to FIGS. 16 and 17, a cross-sectional view of an electronic expansion valve embodying principles of the present disclosure in another exemplary embodiment is schematically shown in FIG. 16, and an enlarged view of part C in FIG. 16 is schematically shown in FIG. 17.

[0124] As shown in FIGS. 16 and 17, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure further comprises a guide seat 300. Specifically, at least a portion of the guide seat 300 is arranged in the valve cavity 101 of the valve seat assembly 100 and fixedly connected with the valve seat assembly 100, and the material hardness of the guide seat 300 is less than that of the valve seat assembly 100. On this basis, the cavity wall of the valve cavity 101 is provided with a first positioning surface 1012 facing the guide seat 300 and located on the side of the guide seat 300 facing the first valve port 1011, and the guide seat 300 has a second positioning surface 3101 facing the first positioning surface 1012. The first positioning surface 1012 is provided with a positioning protrusion 1013, and the positioning protrusion 1013 is pressed against the guide seat 300 (for example, the second positioning surface 3101), so that the guide seat 300 with relatively small material hardness is deformed, thereby achieving the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. Through the above structural design, the present disclosure can utilize the positioning protrusion 1013 to press against the valve seat assembly 100 or the guide seat 300 to cause deformation thereof, so that the deformed guide seat 300 is limited and matched with the valve seat assembly 100 in the circumferential direction, thereby avoiding the relative rotation of the guide seat 300 and the valve seat assembly 100 in the circumferential direction or the relative displacement of the guide seat 300 and the valve seat assembly 100 in the axial direction, and achieving reliable positioning of the guide seat 300.

[0125] It should be noted that in an embodiment not shown in the present disclosure, the material hardness of the guide seat 300 can also be greater than that of the valve seat assembly 100. On this basis, the positioning protrusion 1013 can be arranged on the guide seat 300, i.e., the positioning protrusion 1013 is located on the second positioning surface 3101, and the positioning protrusion 1013 is pressed against the valve seat assembly 100 (for example, the first positioning surface 1012), so that the valve seat assembly 100 with relatively small material hardness is deformed, thereby achieving the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. In other words, in various possible embodiments consistent with the design concept of the present disclosure, the material hardness of the guide seat 300 is different from that of the valve seat assembly 100, and among the two, the one with greater material hardness is provided with the positioning protrusion 1013, and the positioning protrusion 1013 is located on the first positioning surface 1012 or the second positioning surface 3101, and the positioning protrusion 1013 is pressed against the other one (i.e., the one with smaller material hardness) of the valve seat assembly 100 and the guide seat 300.

[0126] As shown in FIG. 16, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure can further comprise a second elastic member 420. Specifically, the electronic expansion valve further comprises a support seat 130 connected to the valve seat assembly 100. The drive assembly 400 comprises a second screw rod 450, and the second elastic member 420 is sleeved on the outer periphery of the second screw rod 450 and located between the support seat 130 and the second screw rod 450.

[0127] Referring to FIG. 18, a cross-sectional view schematically illustrating an electronic expansion valve embodying principles of the present disclosure in another exemplary embodiment is shown; and referring to FIG. 19, an enlarged view schematically illustrating portion E of FIG. 18 is shown.

[0128] As shown in FIGS. 18 and 19, in an embodiment of the present disclosure, the valve core assembly 200 further comprises a flow guide groove 260. Specifically, the flow guide groove 260 is arranged on the outer periphery of the first valve needle 210, the groove opening of the flow guide groove 260 faces the first valve needle 210 and is closed by the first valve needle 210, the groove wall of the flow guide groove 260 is provided with flow guide holes 261, and the transverse channel 2103 is connected in communication with the valve cavity 101 via the groove cavity of the flow guide groove 260 and the flow guide holes 261. Through the above design, since the transverse channel 2103 can be connected in communication with the valve cavity 101 via the groove cavity of the flow guide groove 260 and the flow guide holes 261, the fluid can flow to the groove cavity of the flow guide groove 260 through the flow guide holes 261, and then flow to the transverse channel 2103 through the groove cavity of the flow guide groove 260. Due to the presence of the flow guide groove 260, the flow guide holes 261 do not need to be arranged one by one corresponding to the transverse channel 2103, thereby reducing the processing difficulty of arranging the transverse channel 2103 in the valve core assembly 200 and improving the processing convenience.

[0129] In an embodiment of the present disclosure, the flow guide groove 260 can have a ring groove structure, and the flow guide groove 260 is arranged around the outer periphery of the first valve needle 210. Through the above structure design, the present disclosure can make the flow of the fluid entering each transverse channel 2103 through the flow guide groove 260 more uniform.

[0130] Referring to FIGS. 20 to 23, FIG. 20 schematically illustrates a cross-sectional view of an electronic expansion valve embodying principles of the present disclosure in another exemplary embodiment, for example, a cross-sectional view taken along the straight line P-P in FIG. 43; FIG. 21 schematically illustrates an enlarged view of the partial structure shown in FIG. 20; FIG. 22 schematically illustrates a perspective view of the valve core assembly 200 shown in FIG. 20; and FIG. 23 schematically illustrates a perspective view of the first assembly body 211.

[0131] As shown in FIGS. 20-23, in an embodiment of the present disclosure, the first valve needle 210 is provided with a guide portion 270 located at the opening of the flow cavity 2101 and having a guide surface 2701. The guide surface 2701 matches the shape of at least part of the outer periphery of the second valve needle 220 to guide the second valve needle 220. The gap between the guide surface 2701 and the second valve needle 220 communicates the back pressure cavity 1014 and the flow cavity 2101 (also via the flow passage 2105) described above. The drive assembly 400 includes a first screw rod 430 connected to the second valve needle 220, which can drive the second valve needle 220 to move axially relative to the first valve needle 210. Through the above design, the present disclosure realizes the guiding function of the second valve needle 220 by the guide portion 270, avoids large-angle tilting of the second valve needle 220 during movement, and ensures the stability and reliability of the valve core assembly 200 movement.

[0132] The gap between the guide surface 2701 and the second valve needle 220 communicates the back pressure cavity 1014 and the flow cavity 2101, i.e., the second valve needle 220 and the first valve needle 210 have no sealing structure, and the two valve needles 220 are non-inner balanced structures. The first valve needle 210 of the present disclosure adopts the above-mentioned non-inner balanced structure, which can avoid setting an additional sealing ring between the first valve needle 210 and the second valve needle 220, reduce the number of parts of the electronic expansion valve, and reduce the structural complexity. Since the above-mentioned sealing ring is avoided, the present disclosure also does not need to weld the corresponding pressure plate, which can reduce the welding process and improve the production efficiency of the product. On this basis, compared with the prior art, when the additional sealing ring between the first valve needle 210 and the second valve needle 220 is cancelled, the second valve needle 220 is more likely to tilt at a large angle during movement. To this end, the present disclosure can further adapt to the guiding needs of the second valve needle 220 in this case through the guiding function of the guide portion 270, which is conducive to the specific implementation of the design of cancelling the additional sealing ring. Of course, the design of the valve core assembly 200 of the present disclosure can also adopt the above-mentioned inner balanced structure design. At this time, through the guiding function of the guide portion 270, the present disclosure can still improve the guiding effect of the second valve needle 220, and further reduce the possibility of large-angle tilting during movement.

[0133] As shown in FIGS. 1, 16 and 17, in an embodiment of the present disclosure, at least part of the guide seat 300 is arranged in the valve cavity 101 of the valve seat assembly 100 and fixedly connected with the valve seat assembly 100. On this basis, the first positioning surface 1012 is provided with a positioning protrusion 1013, according to which the positioning protrusion 1013 is pressed against the guide seat 300 (for example, the second positioning surface 3101), the material hardness of the positioning protrusion 1013 is greater than that of the guide seat 300 abutting against it, so that the guide seat 300 with relatively smaller material hardness is deformed, thereby achieving the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. Through the above structural design, the present disclosure can utilize the positioning protrusion 1013 to press against the valve seat assembly 100 or the guide seat 300 to make it deformed, according to which the deformed guide seat 300 is limited and matched with the valve seat assembly 100 in the circumferential direction, avoiding the relative rotation of the guide seat 300 and the valve seat assembly 100 along the circumferential direction or the relative displacement of the guide seat 300 and the valve seat assembly 100 along the axial direction, and realizing the reliable positioning of the guide seat 300.

[0134] As shown in FIG. 17, in an embodiment of the present disclosure, the cavity wall of the valve cavity 101 is provided with a first positioning surface 1012, the first positioning surface 1012 faces the guide seat 300, and the guide seat 300 has a second positioning surface 3101 facing the first positioning surface 1012. The positioning protrusion 1013 is located in one of the first positioning surface 1012 and the second positioning surface 3101, and abuts against the other one.

[0135] It should be noted that, in an embodiment of the present disclosure which is not shown in the drawings, the material hardness of the guide seat 300 can also be greater than that of the valve seat assembly 100. On this basis, the positioning protrusion 1013 can be arranged on the guide seat 300, that is, the positioning protrusion 1013 is located on the second positioning surface 3101, according to which the positioning protrusion 1013 is pressed against the valve seat assembly 100 (for example, the first positioning surface 1012), so that the valve seat assembly 100 with relatively smaller material hardness is deformed, thereby achieving the positioning function of the valve seat assembly 100 and the guide seat 300 in the axial and circumferential directions. In other words, in various possible embodiments consistent with the design concept of the present disclosure, one of the guide seat 300 and the valve seat assembly 100 with greater material hardness is provided with the positioning protrusion 1013, and the positioning protrusion 1013 is pressed against the other one (that is, the one with smaller material hardness) of the valve seat assembly 100 and the guide seat 300.

[0136] As shown in FIG. 16, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure comprises a valve core assembly 200, which is arranged in the valve cavity 101 of the valve seat assembly 100 and can move in the valve cavity 101 in the axial direction, thereby realizing the opening or closing of the first valve port 1011 (which can be realized by the first valve needle of the valve core assembly 200). The valve core assembly 200 is provided with a sliding part 250. The sliding part 250 is in sliding cooperation with the guide seat 300, and the end of the guide seat 300 away from the first valve port 1011 abuts against the end wall of the valve cavity 101 away from the first valve port 1011.

[0137] As shown in FIGS. 24-26, in an embodiment of the present disclosure, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and the orthographic projection of the positioning protrusion 1013 can form a closed annular shape on the reference plane. Through the above structural design, the positioning protrusion 1013 is designed as a closed annular structure, thereby realizing the pressing positioning of the guide seat 300 at each position in the circumferential direction, and at the same time, it is beneficial to simplify the structural complexity when the positioning protrusion 1013 is arranged on the valve seat assembly 100, and to reduce the processing difficulty.

[0138] Referring to FIG. 27, a perspective structural schematic view of the valve core sleeve 110 of the electronic expansion valve capable of embodying the principles of the present disclosure is shown in another exemplary embodiment.

[0139] Unlike the embodiment shown in FIG. 26, in which the positioning protrusion 1013 is designed as a closed annular structure, as shown in FIG. 27, in another embodiment of the present disclosure, the first positioning surface 1012 (or the second positioning surface 3101) can be provided with two positioning protrusions 1013. On this basis, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and the orthographic projection of the two positioning protrusions 1013 can be arranged along a closed annular path. Through the above structural design, the positioning protrusion 1013 is designed as a plurality of disconnected structures, thereby further pressing the guide seat 300 at the end of the positioning protrusion 1013 in the extending direction (such as the above-mentioned annular path, i.e., the circumferential direction), thereby further improving the positioning effect of the guide seat 300. In some embodiments, the first positioning surface 1012 can also be provided with three or more positioning protrusions 1013, and the orthographic projection of the positioning protrusions 1013 is arranged along a closed annular path, which is not limited to the above-mentioned embodiment.

[0140] As shown in FIG. 27, based on the structure design that the first positioning surface 1012 is provided with at least two positioning protrusions 1013, in an embodiment of the present disclosure, the shape of each positioning protrusion 1013 can be the same, and the at least two positioning protrusions 1013 can be uniformly arranged along the above-mentioned annular path. Through the above-mentioned structure design, the present disclosure can make the positioning effect of each positioning protrusion 1013 on each position of the guide seat 300 more uniform.

[0141] In an embodiment of the present disclosure not shown in the figure, when the positioning protrusions 1013 are arranged along the annular path, the positioning protrusions 1013 arranged along one annular path can also be only one, and the shape is not closed, for example but not limited to "C" shape, and is not limited to the above-mentioned embodiment.

[0142] In an embodiment of the present disclosure not shown in the figure, the first positioning surface 1012 (or the second positioning surface 3101) can be provided with at least two positioning protrusions 1013, and the at least two positioning protrusions 1013 can be arranged in radial direction. For example, taking the positioning protrusions 1013 in the closed annular structure shown in FIG. 26 as an example, on this basis, the first positioning surface 1012 can be provided with two or more positioning protrusions 1013, and these positioning protrusions 1013 are arranged in radial direction in the form of nested annular. For another example, taking the at least two annular protrusions arranged in the annular path shown in FIG. 27 as an example, on this basis, the first positioning surface 1012 can be provided with two or more groups of positioning protrusions 1013, wherein at least one group of positioning protrusions 1013 can adopt the above-mentioned structure design of FIG. 27, and the remaining groups of positioning protrusions 1013 can adopt similar structure design, or can also adopt the above-mentioned structure design of FIG. 26. For another example, different from the structure design that the positioning protrusions 1013 are arranged along the annular path in the embodiments shown in FIG. 26 or FIG. 27, in other embodiments of the present disclosure, the positioning protrusions 1013 can also not be arranged along the annular path (whether closed or not), on this basis, the first positioning surface 1012 can be provided with at least two positioning protrusions 1013, and the two positioning protrusions 1013 are arranged in radial direction.

[0143] As shown in FIG. 17, in an embodiment of the present disclosure, the cross section of the positioning protrusion 1013 can be triangular. In other embodiments, the cross section of the positioning protrusion 1013 can also be other shapes, for example but not limited to trapezoidal, rectangular, arc-shaped, etc.

[0144] As shown in FIGS. 1, 24 and 25, in an embodiment of the present disclosure, the valve seat assembly 100 can include the valve core sleeve 110 and the valve cover 120 connected in an axial direction, the valve core sleeve 110 is provided with a first cavity penetrating in an axial direction, the valve cover 120 is provided with a second cavity penetrating in an axial direction, and the first valve port 1011 is arranged at one end of the valve core sleeve 110 away from the valve cover 120. On this basis, the end face of the valve core sleeve 110 at the end facing the valve cover 120 can partially form the first positioning face 1012. Through the above structural design, the present disclosure realizes the clamping of the guide seat 300 by the mutually assembled valve core sleeve 110 and valve cover 120, that is, a part of the end face of the valve core sleeve 110 at the end facing the valve cover 120 is provided with the positioning protrusion 1013 to realize the positioning function, and the other part directly participates in the fixed assembly of the guide seat 300. Accordingly, the present disclosure can realize the machining of the positioning protrusion 1013 when manufacturing the valve core sleeve 110, which is conducive to reducing the assembly difficulty and component machining difficulty.

[0145] As shown in FIGS. 25 and 26, based on the structural design that the valve seat assembly 100 includes the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the positioning protrusion 1013 is arranged on the valve seat assembly 100 and located at the first positioning face 1012, and the end of the valve core sleeve 110 facing the valve cover 120 can be provided with a first opening 1101, which is communicated with the first cavity of the valve seat assembly 100. Accordingly, the end face of the valve core sleeve 110 at the end facing the valve cover 120 is annular. On this basis, the positioning protrusion 1013 can be arranged at the inner edge of the above-mentioned end face, that is, in a radial direction, the positioning protrusion 1013 is arranged in a spaced manner with the outer edge of the end face, so as to realize that a part of the end face directly serves as the above-mentioned first positioning face 1012. In other embodiments, the positioning protrusion 1013 can also be arranged at the middle part of the above-mentioned end face, that is, in a radial direction, the positioning protrusion 1013 is arranged in a spaced manner with the inner edge and the outer edge of the end face, or the positioning protrusion 1013 can also be arranged at the outer edge of the above-mentioned end face, which is not limited to the above-mentioned embodiments.

[0146] As shown in FIG. 17, based on the structural design that the positioning protrusion 1013 is arranged at the inner edge of the end face of the valve core sleeve 110, in an embodiment of the present disclosure, the cavity wall of the first cavity of the valve core sleeve 110 at the first opening 1101 thereof can be provided with a slope, which is connected with the side face of the positioning protrusion 1013 (for example, the cross section of the positioning protrusion 1013 can be triangular, trapezoidal, etc., and the side face is also a slope) as an integral guide slope 1102.

[0147] As shown in FIG. 17, based on the structural design of the valve seat assembly 100 including the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the cavity wall of the second cavity of the valve cover 120 can be provided with a third positioning surface 1201 facing the first positioning surface 1012 and arranged axially spaced apart, so that the valve cavity 101 forms a positioning chamber between the first positioning surface 1012 and the third positioning surface 1201. On this basis, the outer periphery of the guide seat 300 can be provided with a positioning boss 310 at least partially accommodated in the positioning chamber, and the positioning boss 310 has a fourth positioning surface 3102 facing the valve cover 120, the fourth positioning surface 3102 abutting against the third positioning surface 1201, and the positioning protrusion 1013 abutting against the side surface of the positioning boss 310 facing the valve core sleeve 110, i.e., the side surface of the positioning boss 310 facing the valve core sleeve 110 is the second positioning surface 3101.

[0148] In an embodiment of the present disclosure, the material hardness of the guide seat 300 can be less than the material hardness of the valve core sleeve 110, and the material hardness of the guide seat 300 can be greater than the material hardness of the sliding part 250. For example, the sliding part 250 can be a guide nut, the material of which can be plastic, the material of the guide seat 300 can be aluminum alloy or brass, and the material of the valve core sleeve 110 can be stainless steel.

[0149] Based on the structural design of the valve seat assembly 100 including the valve core sleeve 110 and the valve cover 120, in an embodiment of the present disclosure, the guide seat 300 can be press-fitted into the valve cover 120 (e.g., the second cavity) in an interference fit manner. Accordingly, under the fluid cold and hot environment, the guide seat 300 can expand and contract due to heat, causing the connection between the guide seat 300 and the valve cover 120 to loosen, and thus the fixing strength of the guide seat 300 needs to be increased. The guide seat 300 is pressed between the valve cover 120 and the valve core sleeve 110 and deformed, clamped by the valve cover 120 and the valve core sleeve 110, and the deformed guide seat 300 is limited in the circumferential direction by the valve core sleeve 110, preventing the guide seat 300 from rotating.

[0150] Referring to FIGS. 28 to 35, FIG. 28 representatively shows a perspective structural schematic view of an electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment; FIG. 29 representatively shows a sectional view of the electronic expansion valve; FIG. 30 representatively shows a structural schematic view of a rotor assembly and a guide rod; FIG. 31 representatively shows a partially exploded view of the electronic expansion valve; FIG. 32 representatively shows a structural schematic view of a guide seat; FIG. 33 representatively shows an installation position schematic view of the guide seat; FIG. 34 representatively shows a structural schematic view of a first seat body; and FIG. 35 representatively shows another structural schematic view of the guide seat.

[0151] As shown in FIGS. 28-32, the present disclosure proposes an electronic expansion valve, which comprises a housing 6100, a stator assembly, a rotor assembly 6200, a lead screw 6300, a valve core assembly 6400, and a valve seat assembly 6500. The housing 6100 covers the outer side of the rotor assembly 6200, part of the lead screw 6300, and part of the valve core assembly 6400, and is welded to the valve seat assembly 6500. The stator assembly is sleeved on the outer side of the housing 6100, and can drive the rotor assembly 6200 to rotate. The valve seat assembly 6500 is provided with a valve port 6510, the valve core assembly 6400 can move along the axial direction of the lead screw 6300 relative to the valve seat assembly 6500, one end of the lead screw 6300 is fixedly connected to the rotor assembly 6200, the other end is threadedly connected to the valve core assembly 6400, and the rotor assembly 6200 can drive the valve core assembly 6400 to move towards the direction of approaching or moving away from the valve port 6510 through the lead screw 6300.

[0152] The electronic expansion valve further comprises a stop ring 6600, a guide rod 6700, and a stop seat 6800, the stop seat 6800 is sleeved on the outer side of the lead screw 6300 and is fixedly connected to the valve seat assembly 6500. The outer circumferential side of the stop seat 6800 away from the lead screw 6300 is further provided with an outer guide rail portion 6810 (in this embodiment, an outer threaded guide rail), the stop ring 6600 is sleeved on the outer circumferential side of the stop seat 6800 and is movably matched with the outer guide rail portion 6810, the guide rod 6700 is fixedly connected to the rotor assembly 6200 or the lead screw 6300, and the rotor assembly 6200 can drive the guide rod 6700 to push the stop ring 6600 to move spirally along the outer guide rail portion 6810.

[0153] The valve core assembly 6400 comprises a sliding nut 6410, a first valve needle 6420, and a second valve needle 6430, the end of the lead screw 6300 away from the rotor assembly 6200 is threadedly matched with the sliding nut 6410, and the lead screw 6300 can drive the sliding nut 6410 to drive the second valve needle 6430 to open or close the valve port 6510 through the first valve needle 6420. The second valve needle 6430 is provided with an adjusting passage 6431 capable of communicating with the valve port 6510, the flow area of the adjusting passage 6431 is smaller than that of the valve port 6510, and the lead screw 6300 can drive the sliding nut 6410 to drive the first valve needle 6420 to movably match with the adjusting passage 6431, so as to control the liquid inflow amount of the adjusting passage 6431.

[0154] In this way, the lead screw 6300 can be first rotated in a preset direction to drive the sliding nut 6410 to drive the first valve needle 6420 and the second valve needle 6430 to close the valve port 6510, and then the lead screw 6300 can be rotated in a direction opposite to the preset direction to drive the sliding nut 6410 to drive the first valve needle 6420 to move in a direction away from the adjusting passage 6431, so as to realize the fine adjustment of the liquid inflow amount at the adjusting passage 6431.

[0155] In an embodiment of the present disclosure, the electronic expansion valve further comprises a first elastic member 6910, one end of the first elastic member 6910 is connected to the screw rod 6300, and the other end is connected to the stop seat 6800 or the valve seat assembly 6500, and the connection here includes abutting. The first elastic member 6910 is a compression elastic member, so that the screw rod 6300 and the stop seat 6800 (or the valve seat assembly 6500) can be movably matched along the axial direction of the screw rod 6300 through the first elastic member 6910.

[0156] When the valve core assembly 6400 moves to the position of closing the valve port portion 6510, and the rotor assembly 6200 continues to rotate, both the first valve needle 6420 and the second valve needle 6430 cannot continue to move towards the valve port portion 6510. Since the screw rod 6300 and the valve seat assembly 6500 can be movably matched along the axial direction of the screw rod 6300 through the first elastic member 6910, the screw rod 6300 and the rotor assembly 6200 move towards the direction away from the valve port portion 6510, and the first elastic member 6910 is squeezed during the movement of the screw rod 6300. Under the pushing of the reaction force, the first elastic member 6910 generates an elastic force on the screw rod 6300, which can drive the screw rod 6300 to further squeeze the valve port portion 6510 to generate a pre-tightening force on the valve port portion 6510, thereby improving the sealing between the valve port portion 6510 and the second valve needle 6430.

[0157] Specifically, in an embodiment of the present disclosure, the first elastic member 6910 is a compression spring or a metal elastic sheet.

[0158] In an embodiment of the present disclosure, the electronic expansion valve further comprises a second elastic member 6920, one end of the second elastic member 6920 abuts against the second valve needle 6430, and the other end abuts against the valve seat assembly 6500, and the second elastic member 6920 is a compression elastic member, so that the second valve needle 6430 has a tendency to move towards the direction close to the valve port portion 6510.

[0159] In this way, the second valve needle 6430 is always driven by the driving force of the second elastic member 6920, which can avoid the left and right shaking of the second valve needle 6430, thereby facilitating the centering of the first valve needle 6420 and the adjustment channel 6431.

[0160] Specifically, in an embodiment of the present disclosure, the second elastic member 6920 is a compression spring, and the second elastic member 6920 is sleeved on the outer side of part of the second valve needle 6430 and part of the sliding nut 6410.

[0161] In this way, it is beneficial to control the size of the driving force of the second elastic member 6920 on the second valve needle 6430.

[0162] In an embodiment of the present disclosure, as shown in FIGS. 29, 31 and 32, the electronic expansion valve further comprises a guide seat 6820 arranged on the stop seat 6800 close to one end of the valve port 6510 and connected to the valve seat assembly 6500, and the sliding nut 6410 is movably connected to the guide seat 6820 along the preset axial direction. The valve core assembly 6400 and the guide seat 6820 are limitingly connected along the circumferential direction around the preset axial direction. Therefore, without machining the sliding groove on the stop seat 6800 for limiting the rotation of the valve core assembly 6400, only one guide seat 6820 needs to be machined, which reduces the difficulty of the limiting design of the rotation of the valve core assembly 6400.

[0163] Specifically, the guide seat 6820 is connected to the valve seat assembly 6500 in an interference fit, and the top of the guide seat 6820 extends into the stop seat 6800.

[0164] It should be noted that the preset axial direction, the axial direction of the screw rod 6300, the axial direction of the stop seat 6800, the axial direction of the valve core assembly 6400, the axial direction of the rotor assembly 6200 and the axial direction of the electronic expansion valve are all in the same direction, that is, in the electronic expansion valve, the screw rod 6300, the stop seat 6800 and the valve core assembly 6400 are coaxially arranged.

[0165] Since the guide seat 6820 and the stop seat 6800 are respectively connected to the valve seat assembly 6500, and the guide seat 6820 and the stop seat 6800 are independent components, the guide seat 6820 can be machined independently, which greatly reduces the machining difficulty of the guide seat 6820 and the stop seat 6800.

[0166] Specifically, in an embodiment of the present disclosure, the guide seat 6820 is a metal piece, specifically, the guide seat 6820 is made of aluminum alloy, stainless steel or copper alloy, etc., which are not listed one by one here.

[0167] In this way, the wear resistance of the guide seat 6820 axially connected to the sliding nut 6410 is increased, and the machining cost of the guide seat 6820 is reduced.

[0168] Further, in an embodiment of the present disclosure, as shown in FIGS. 29 and 31, the sliding nut 6410 comprises a nut body 6411 and a rotation-stopping protrusion 6412 fixedly arranged on the outer circumferential side of the nut body 6411, the guide seat 6820 is provided with a main body hole 6821 and a limiting hole 6822 communicating with the main body hole 6821, the nut body 6411 and the main body hole 6821 are movably connected along the preset axial direction, and the rotation-stopping protrusion 6412 and the limiting hole 6822 are movably connected along the preset axial direction and limitingly connected along the circumferential direction around the preset axial direction.

[0169] That is, the rotation-stopping protrusion 6412 does not affect the sliding fit of the sliding nut 6410 and the guide seat 6820 along the preset axial direction, but under the limiting action of the limiting hole 6822, the rotation-stopping protrusion 6412 cannot rotate around the preset axial direction, that is, the sliding nut 6410 cannot rotate relative to the guide seat 6820.

[0170] In an embodiment of the present disclosure, the main body hole 6821 and the limiting hole 6822 both pass through the guide seat 6820 along the preset axial direction.

[0171] Specifically, the number of the rotation-stopping protrusion 6412 can be one or multiple. For example, when the number of the rotation-stopping protrusion 6412 is two, the two rotation-stopping protrusions 6412 are arranged at the opposite ends of the nut main body 6411. For the convenience of processing, multiple rotation-stopping protrusions 6412 are uniformly spaced along the direction around the preset axial direction.

[0172] In an embodiment of the present disclosure, as shown in FIGS. 29, 31 and 32, the guide seat 6820 is in a cylindrical shape, the main body hole 6821 and the guide seat 6820 are coaxially arranged, and the limiting hole 6822 passes through the side wall of the guide seat 6820 along the preset axial direction. Of course, the limiting hole 6822 can also not pass through the side wall of the guide seat 6820.

[0173] It should be noted that when one limiting hole 6822 also passes through the side wall of the guide seat 6820 along the radial direction, the guide seat 6820 is in a C shape with one side notched.

[0174] When the length of the rotation-stopping protrusion 6412 along the radial direction of the guide seat 6820 is greater than or equal to the thickness of the side wall of the guide seat 6820, the limiting hole 6822 passes through the side wall of the guide seat 6820 along the radial direction of the guide seat 6820. In this way, the guide seat 6820 is separated by the limiting hole 6822. In order to improve the structural strength of the guide seat 6820, in the present embodiment, as shown in FIGS. 29, 31 and 32, a first connecting piece 6823 is fixedly sleeved on the outer periphery of the guide seat 6820. Specifically, the first connecting piece 6823 is sleeved on the middle part of the guide seat 6820, and the first connecting piece 6823 and the guide seat 6820 are an integral molded piece.

[0175] Further, when the length of the rotation-stopping protrusion 6412 continues to be lengthened, in an embodiment of the present disclosure, as shown in FIGS. 29, 31 and 32, the first connecting piece 6823 is provided with a through hole 6824 passing through itself along the preset axial direction, and the through hole 6824 is communicated with one end of the limiting hole 6822 away from the main body hole 6821.

[0176] In an embodiment of the present disclosure, as shown in FIGS. 31 and 32, the guide seat 6820 is provided with a ring of protrusions 6825 at one end close to the valve port 6510, and the valve seat assembly 6500 is provided with a clamping protrusion 6520 corresponding to the protrusions 6825, which can be clamped into the protrusions 6825 along the preset axial direction to prevent the guide seat 6820 from rotating relative to the valve seat assembly 6500.

[0177] In this way, during assembly, the guide seat 6820 can be prevented from rotating relative to the valve seat assembly 6500 by clamping the clamping protrusion 6520 into the protrusions 6825 along the preset axial direction.

[0178] Specifically, the number of clamping protrusions 6520 can be one or multiple, and when the number of clamping protrusions 6520 is multiple, the multiple clamping protrusions 6520 are arranged on the valve seat assembly 6500 along the direction around the preset axial direction.

[0179] However, the protrusions 6825 can also be arranged on the valve seat assembly 6500, and the guide seat 6820 is provided with a clamping protrusion 6520 corresponding to the protrusions 6825, but not limited thereto.

[0180] In an embodiment of the present disclosure, as shown in FIG. 31, the valve seat assembly 6500 is provided with a first limiting protrusion 6530 and a second limiting protrusion 6540 arranged oppositely at one end close to the guide seat 6820, and the guide seat 6820 is clamped between the first limiting protrusion 6530 and the second limiting protrusion 6540.

[0181] In this way, the guide seat 6820 can be limited to prevent the guide seat 6820 from tilting when the protrusions 6825 are deformed.

[0182] As shown in FIGS. 33 to 35, in an embodiment of the present disclosure, the guide seat 6820 has a second connecting piece 1-2 in addition to the first connecting piece 6823. Specifically, the first seat body 1-5 has a first mounting groove 1-1, and the end of the second seat body 1-6 is located in the first mounting groove 1-1. The outermost circumference of the guide seat 6820 is provided with the second connecting piece 1-2, which is clamped between the bottom wall of the first mounting groove 1-1 and the end of the second seat body 1-6. The bottom wall of the first mounting groove 1-1 has a through hole, and the inner wall of the first seat body 1-5 is L-shaped. The two end faces of the second connecting piece 1-2 along the valve axial direction are respectively attached to the first seat body 1-5 and the second seat body 1-6, and the second connecting piece 1-2 is clamped firmly by the first seat body 1-5 and the second seat body 1-6 to prevent the guide seat 6820 from rotating.

[0183] The gap between the circumferential outer wall of the second connecting piece 1-2 and the circumferential inner wall of the first mounting groove 1-1 can avoid the second connecting piece 1-2 being too large in the radial direction of the valve and being difficult to install in the first seat body 1-5. The circumferential outer wall of the second connecting piece 1-2 specifically refers to the annular side wall between the two end faces of the second connecting piece 1-2. The circumferential inner wall of the first mounting groove 1-1 specifically refers to the annular inner wall in the axial direction of the valve.

[0184] The second connecting piece 1-2 is located outside the first connecting piece 6823. The first seat body 1-5 has a second mounting groove 1-3, the bottom wall of the second mounting groove 1-3 has a through hole, and the second mounting groove 1-3 makes the inner wall of the first seat body 1-5 L-shaped. The bottom wall of the first mounting groove 1-1 is recessed in the direction away from the valve port to form the second mounting groove 1-3. The circumferential outer wall of the first connecting piece 6823 is fixedly connected with the circumferential inner wall of the second mounting groove 1-3, which can further avoid the rotation of the guide seat 6820, wherein the fixed connection includes detachable movable connection. The circumferential outer wall of the first connecting piece 6823 specifically refers to the annular wall in the axial direction of the valve. The circumferential inner wall of the second mounting groove 1-3 specifically refers to the annular inner wall in the axial direction of the valve.

[0185] The circumferential outer wall of the first connecting piece 6823 and the circumferential inner wall of the second mounting groove 1-3 can be fixedly connected in a threaded connection manner. In order to avoid the deformation of the guide seat 6820 caused by the extrusion between the end of the first connecting piece 6823 away from the second connecting piece 1-2 and the bottom wall of the second mounting groove 1-3 during the threaded connection process, there is a gap between the end of the first connecting piece 6823 away from the second connecting piece 1-2 and the bottom wall of the second mounting groove 1-3 after the first connecting piece is installed.

[0186] The specific installation process of the guide seat 6820 is as follows: the guide seat 6820 is threadedly connected with the first seat body 1-5 until the second connecting piece 1-2 is attached to the first seat body 1-5, at this time the installation between the guide seat 6820 and the first seat body 1-5 is in place; then, the second seat body 1-6 is installed, specifically, the second seat body 1-6 is attached to the side of the second connecting piece 1-2 away from the first seat body 1-5, and then the second seat body 1-6 is fixedly connected with the first seat body 1-5, at this time the guide seat 6820 is compressed between the first seat body 1-5 and the second seat body 1-6, and the guide seat 6820 is fixedly installed.

[0187] As shown in FIG. 33, the electronic expansion valve further includes a mounting seat 1-7, the mounting seat 1-7 is a mounting cavity, the second seat body 1-6 is located in the mounting cavity, and at least part of the first seat body 1-5 is located in the mounting cavity and connected with the mounting seat 1-7. The mounting seat 1-7 has a fluid inlet and a fluid outlet, the fluid inlet is in communication with the inside of the second seat body 1-6, and the valve port portion 6510 is in communication with the fluid outlet.

[0188] As shown in FIG. 33, in an embodiment of the present disclosure, the valve port 6510 can be made of metal. To avoid the problem of poor sealing performance between the second valve needle 6430 made of metal and the valve port 6510 made of metal, the second valve needle 6430 can be provided with a sealing member 1-4. The hardness of the sealing member 1-4 is less than that of the valve port 6510. The sealing member 1-4 can be made of rubber or plastic. The sealing member 1-4 is in sealing cooperation with the valve port 6510 to ensure that the valve port 6510 does not leak when closed.

[0189] As described above, according to the above-mentioned embodiments shown in FIGS. 28-35, the present disclosure provides an electronic expansion valve, which comprises a valve core assembly and a valve seat assembly. The valve seat assembly is provided with a valve port. The valve core assembly can open or close the valve port. The electronic expansion valve further comprises a guide seat. The guide seat is arranged at one end of the valve seat assembly away from the valve port. The valve core assembly and the guide seat are in movable cooperation along a predetermined axial direction. The valve core assembly and the guide seat are in limiting cooperation along a circumferential direction around the predetermined axial direction.

[0190] In an embodiment of the present disclosure, the guide seat is in interference fit connection with the valve seat assembly.

[0191] In an embodiment of the present disclosure, a stop seat is further included. The top of the guide seat extends into the stop seat.

[0192] In an embodiment of the present disclosure, the valve core assembly comprises a sliding nut. The sliding nut comprises a nut body and a rotation-stopping protrusion. The rotation-stopping protrusion is fixedly arranged on the outer circumferential side of the nut body. The guide seat is provided with a main body hole and a limiting hole communicating with the main body hole. The nut body and the main body hole are in movable cooperation along the predetermined axial direction. The rotation-stopping protrusion and the limiting hole are in movable cooperation along the predetermined axial direction and in limiting cooperation along the circumferential direction around the predetermined axial direction.

[0193] In an embodiment of the present disclosure, the guide seat is in the shape of a cylinder. The main body hole and the guide seat are coaxially arranged. The limiting hole is arranged on the side wall of the guide seat along the predetermined axial direction.

[0194] In an embodiment of the present disclosure, a first connecting member is fixedly sleeved on the outer circumferential side of the guide seat.

[0195] In an embodiment of the present disclosure, the first connecting member is provided with a through hole penetrating through itself along the predetermined axial direction. The through hole is in communication with one end of the limiting hole away from the main body hole.

[0196] Referring to FIG. 36, a perspective structural schematic view of another exemplary embodiment of the electronic expansion valve provided by the present disclosure is representatively shown.

[0197] As shown in FIG. 36, in an embodiment of the present disclosure, the electronic expansion valve provided by the present disclosure comprises a valve seat assembly 100, a valve core assembly 200, and a driving assembly 400. Referring to FIGS. 18, 19, 37-41, FIG. 37 shows a perspective view of the valve core assembly 200; FIG. 38 shows an axial sectional view of FIG. 37; FIG. 39 shows an exploded view of FIG. 37; FIG. 40 shows a perspective view of a valve core sleeve; FIG. 41 shows an axial sectional view of FIG. 40; and FIG. 42 shows a cross-sectional view of the valve core assembly 200, where the cross-sectional position is located at the drainage hole 261 in the axial direction.

[0198] As shown in FIGS. 36-38, in an embodiment of the present disclosure, the valve core assembly 200 comprises a drainage groove body 260. The first valve needle 210 is arranged in the valve cavity 101. The drainage groove body 260 is arranged on the outer periphery of the first valve needle 210, the groove opening of the drainage groove body 260 faces the first valve needle 210 and is closed by the first valve needle 210, the groove wall of the drainage groove body 260 is provided with a drainage hole 261, and the transverse channel 2103 is connected with the valve cavity 101 via the groove cavity of the drainage groove body 260 and the drainage hole 261. Through the above structure design, since the transverse channel 2103 can be connected with the valve cavity 101 via the groove cavity of the drainage groove body 260 and the drainage hole 261, the fluid can flow to the groove cavity of the drainage groove body 260 through the drainage hole 261, and then flow to the transverse channel 2103 through the groove cavity of the drainage groove body 260. Since the drainage groove body 260 exists, the present disclosure does not need to arrange the drainage hole 261 and the transverse channel 2103 one by one, thereby reducing the processing difficulty of arranging the transverse channel 2103 in the valve core assembly 200 and improving the processing convenience.

[0199] As shown in FIG. 18, in an embodiment of the present disclosure, the electronic expansion valve provided by the present disclosure comprises a driving assembly 400 for driving the first valve needle 210 and the second valve needle 220 to move in the axial direction, 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 the end of the valve seat assembly 100 away from the first valve port 1011.

[0200] As shown in FIG. 18 and FIG. 38, in an embodiment of the present disclosure, the first valve needle 210 can further be provided with a flow passage cavity 2101, a flow passage channel 2105 and a longitudinal channel 2104. The flow passage cavity 2101 is located at a side of the transverse channel 2103 and the longitudinal channel 2104 which is away from the first valve port 1011. One end of the flow passage channel 2105 is communicated with the flow passage cavity 2101, and the other end of the flow passage channel 2105 is opened at an end face of the first valve needle 210 which is away from the first valve port 1011. The longitudinal channel 2104 extends in parallel to the axial direction, one end of the longitudinal channel 2104 is opened at an end face of the first valve needle 210 which faces the first valve port 1011, and the other end of the longitudinal channel 2104 is communicated with the flow passage cavity 2101. On this basis, the second valve needle 220 can be partially inserted into the flow passage cavity 2101 from a side of the first valve needle 210 which is away from the first valve port 1011.

[0201] As shown in FIG. 19, in an embodiment of the present disclosure, the groove wall of the flow guide groove body 260 includes a bottom wall 2601 which is away from the first valve needle 210 in the radial direction, in other words, since the opening direction (i.e. the orientation of the slot) of the flow guide groove body 260 is in the radial direction towards the first valve needle 210 (for example, towards the peripheral surface of the second assembly body 212 of the first valve needle 210), the bottom wall 2601 of the flow guide groove body 260 can be understood as a wall surface which is arranged opposite to the peripheral surface of the second assembly body 212. On this basis, the flow guide hole 261 can be provided at the above-mentioned bottom wall 2601 of the flow guide groove body 260, so that the fluid flows in the radial direction between the flow guide groove body 260 and the valve cavity 101.

[0202] As shown in FIG. 40 and FIG. 42, based on the structural design that the flow guide hole 261 is provided at the bottom wall 2601 of the flow guide groove body 260, in an embodiment of the present disclosure, the bottom wall 2601 of the flow guide groove body 260 can be provided with at least two flow guide holes 261, for example but not limited to four flow guide holes 261 as shown in the drawings. Through the above-mentioned structural design, the present disclosure can improve the uniformity of the fluid flow into the flow guide groove body 260 through the flow guide hole 261. In some embodiments, the bottom wall 2601 of the flow guide groove body 260 can also be provided with only one flow guide hole 261, which is not limited to the present embodiment.

[0203] As shown in FIG. 40 and FIG. 42, based on the structural design that the bottom wall 2601 of the flow guide groove body 260 is provided with at least two flow guide holes 261, in an embodiment of the present disclosure, the at least two flow guide holes 261 provided on the bottom wall 2601 of the flow guide groove body 260 can be arranged uniformly in the circumferential direction. Through the above-mentioned structural design, the present disclosure can further improve the uniformity of the fluid flow into the flow guide groove body 260 through the flow guide hole 261.

[0204] As shown in FIG. 19, in an embodiment of the present disclosure, the width of the groove cavity of the drainage groove body 260 can be greater than the width (e.g. inner diameter) of the transverse channel 2103 in the axial direction. In some embodiments, the width of the groove cavity of the drainage groove body 260 can also be equal to the width of the transverse channel 2103 in the axial direction, which is not limited by the present embodiment.

[0205] As shown in FIGS. 37-41, in an embodiment of the present disclosure, the drainage groove body 260 can have 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 flow of fluid into each transverse channel 2103 via the drainage groove body 260 more uniform.

[0206] As shown in FIG. 42, based on the structural design that the first valve needle 210 is provided with at least two transverse channels 2103, in an embodiment of the present disclosure, at least one drainage hole 261 corresponds to the position of at least one transverse 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 can be staggered with at least one transverse channel 2103 in the circumferential direction. Specifically, taking the three transverse channels 2103 and the four drainage holes 261 shown in the drawings as an example, one of the transverse channels 2103 corresponds to the position of one of the drainage holes 261, and the positions of the remaining transverse 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 transverse channels 2103, each drainage hole 261 can correspond to each transverse channel 2103 in the circumferential direction, or can not correspond at all, which is not limited by the above embodiments.

[0207] As shown in FIGS. 38-41, in an embodiment of the present disclosure, the first valve needle 210 can include a first assembly body 211 and a second assembly body 212 which are separately provided and connected to each other. The side of the first assembly body 211 facing the first valve port 1011 can be provided with a groove, and the groove and the side of the second assembly body 212 facing away from the first valve port 1011 together form the flow-through cavity 2101, i.e. the groove participates in forming at least part of the cavity of the flow-through cavity 2101. Through the above design, the present disclosure can improve the structural rationality of the first valve needle 210, and realize the formation of the channels and cavities of the first valve needle 210 with fewer number of parts and simpler part structure, which is more reasonable in structure and convenient for processing and assembly.

[0208] As shown in FIGS. 38-41, based on the structural design that the first valve needle 210 comprises 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 can be connected in a manner such as crimping, 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 transverse channel 2103, the second valve port 2102 and the longitudinal channel 2104 are all arranged 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, and the formation of the channels and cavities of the first valve needle 210 can be realized by using fewer parts and simpler part structures, and the structure is more reasonable and convenient for processing and assembly.

[0209] As shown in FIGS. 38-41, based on the structural design that the first valve needle 210 comprises the first assembly body 211 and the second assembly body 212, in an embodiment of the present disclosure, the drainage groove body 260 can 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 can be an integral structure. Through the above structural design, the present disclosure can reduce the number of parts of the valve core assembly 200 and reduce the assembly difficulty. In some embodiments, the drainage groove body 260 can 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 the present embodiment.

[0210] As shown in FIGS. 19, 36-39, in an embodiment of the present disclosure, the outer periphery of the first valve needle 210 can be provided with a first sealing ring 231, the material hardness of the first sealing ring 231 is less than that of the first valve port 1011, and the first sealing ring 231 is in contact with the first valve port 1011 when the first valve port 1011 is closed, so as to realize soft sealing. On this basis, the periphery of one end of the first valve needle 210 (for example, the second assembly body 212) close to the first valve port 1011 can be provided with a sealing boss 2121, and the drainage groove body 260 is located on the side of the sealing boss 2121 axially away from the first valve port 1011. Accordingly, the first sealing ring 231 can be clamped axially between the drainage groove body 260 and the sealing boss 2121. Through the above structural design, the present disclosure can realize the soft sealing of the first valve needle 210 to the first valve port 1011 by using the first sealing ring 231, and the drainage groove body 260 (for example, the side wall 2602 close to the first valve port 1011 of the drainage groove body 260) is used to participate in the fixing and assembly of the first sealing ring 231, which reduces the additional arrangement of other sealing ring positioning structures, and is beneficial to reduce the structural complexity and reduce the number of parts.

[0211] Referring to Figs. 43-47, Fig. 43 shows a bottom view of Fig. 1; Figs. 20 and 44 show cross-sectional views taken along lines P-P and Q-Q of Fig. 43, respectively; Fig. 45 shows an enlarged view of the portion of Fig. 20, in which the axial cross-sectional structure of the valve core assembly 200 is shown in detail; Fig. 46 shows a top view of Fig. 23; and Fig. 47 shows a perspective cross-sectional view taken along line F-F of Fig. 46.

[0212] As shown in Figs. 1, 20-23, in an embodiment of the present disclosure, the first valve needle 210 is provided with a guide portion 270 located at the opening of the flow passage 2101 and having a guide surface 2701. The guide surface 2701 of the guide portion 270 matches the shape of at least part of the outer periphery of the second valve needle 220, thereby guiding the second valve needle 220. The drive assembly 400 includes a first screw rod 430 connected to the second valve needle 220, which can drive the second valve needle 220 to move axially relative to the first valve needle 210, thereby controlling the opening and closing of the first valve port 1011 and the second valve port 2102. For example, the drive assembly 400 can be arranged in a housing 500 and located at the end of the valve seat assembly 100 away from the first valve port 1011. The first screw rod 430 is guided by other structures of the electronic expansion valve, and the second valve needle 220 is located at the end of the first screw rod 430, far from the guide structure of the first screw rod 430, so that the second valve needle 220 is prone to tilt during movement. Through the above structure design, the present disclosure uses the guide portion 270 to realize the guiding function of the second valve needle 220, avoids large-angle tilting of the second valve needle 220 during movement, ensures the stability and reliability of the movement of the valve core assembly 200, and avoids leakage of the second valve port 2102 in the closed state due to tilting of the second valve needle 220.

[0213] As shown in FIGS. 20-22, in an embodiment of the present disclosure, a valve core sealing ring 213 is arranged between the first valve needle 210 and the valve seat assembly 100, and the valve cavity 101 on the side of the valve core sealing ring 213 away from the first valve port 1011 is a back pressure cavity 1014. The first valve needle 210 is provided with a balance channel, both ends of the balance channel are communicated with the first valve port 1011 and the back pressure cavity 1014, respectively, so that the first valve needle 210 realizes an internal balance structure, and the fluid acting force on the first valve needle 210 is reduced. Moreover, the gap between the guide surface 2701 and the second valve needle 220 is communicated with the back pressure cavity 1014 and the flow-through cavity 2101, respectively, that is, the second valve needle 220 has no sealing structure with the first valve needle 210, and the second valve needle 220 realizes a non-internal balance structure, and the second valve needle 220 will be subjected to fluid acting force. Through the above structure design, since the first valve needle 210 adopts the above non-internal balance structure, the present disclosure can avoid arranging an additional sealing ring between the first valve needle 210 and the second valve needle 220, can reduce the number of parts of the electronic expansion valve, and reduce the structural complexity. Since the arrangement of the sealing ring is avoided, the present disclosure also does not need to weld the tablet for mounting the sealing ring, can reduce the welding process, and is beneficial to improving the production efficiency of the product. On this basis, compared with the prior art, when the additional sealing ring between the first valve needle 210 and the second valve needle 220 is cancelled, the second valve needle 220 is more likely to tilt at a large angle during movement. To this end, the present disclosure can further adapt to the guiding needs of the second valve needle 220 in this case through the guiding function of the guide portion 270, and is beneficial to the specific implementation of the design of cancelling the additional sealing ring.

[0214] As shown in FIGS. 20-23, in an embodiment of the present disclosure, in order to realize the pressure balance at the upper and lower ends of the first valve needle 210, the balance channel includes a flow-through channel 2105 and a longitudinal channel 2104 arranged on the first valve needle 210, the flow-through cavity 2101 is located between the flow-through channel 2105 and the longitudinal channel 2104, the flow-through channel 2105 is communicated with the flow-through cavity 2101 and the back pressure cavity 1014; and the longitudinal channel 2104 is communicated with the first valve port 1011 and the flow-through cavity 2101.

[0215] In an embodiment of the present disclosure, in the radial direction, the gap between the guide surface 2701 of the guide portion 270 and the outer periphery of the second valve needle 220 can be less than or equal to 0.1 mm. Through the above structure design, the present disclosure can avoid that the gap is too small, and when the gap is too small, the friction between the guide surface 2701 and the second valve needle 220 is easy to occur, which affects the movement of the second valve needle 220. At the same time, the present disclosure can avoid that the gap is too large, so as to ensure that the first valve needle 210 tilts at a large angle during movement.

[0216] As shown in FIGS. 45-47, in an embodiment of the present disclosure, the guide portion 270 can have a ring structure, and a guide hole 2702 is formed in the middle of the guide portion 270, the hole wall of the guide hole 2702 being the aforementioned guide surface 2701 of the guide portion 270, and the second valve needle 220 being arranged in the guide hole 2702. In other words, the guide surface 2701 in this embodiment surrounds the second valve needle 220 in the circumferential direction. Further, the flow passage 2105 can be arranged in the guide portion 270, and the flow passage 2105 extends through the guide portion 270 in the axial direction. Through the above structural design, the present disclosure can provide the guide function of the guide portion 270 at each position of the second valve needle 220 in the circumferential direction, improve the guiding effect of the second valve needle 220, and further avoid large-angle tilting of the second valve needle 220 during movement.

[0217] As shown in FIGS. 45-47, based on the structural design that the guide portion 270 has a ring structure, in an embodiment of the present disclosure, the flow passage 2105 can be a through hole, i.e., the flow passage 2105 has a complete (one full circle) inner wall in the circumferential direction, and the through hole is arranged at intervals with the guide hole 2702. Through the above structural design, the present disclosure utilizes the arrangement of the through hole at intervals with the guide hole 2702 to avoid affecting the guide function of the guide hole 2702 for providing the guide function at each position of the second valve needle 220 in the circumferential direction due to the arrangement of the through hole on the guide portion 270, ensure better guide function, and optimize structural rationality.

[0218] Referring to FIG. 48, FIG. 48 schematically shows a top view of the first valve needle 210 (e.g., the first assembly 211) of the electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment.

[0219] Unlike the structural design that the guide portion 270 is provided with one flow passage 2105 in the embodiments shown in FIGS. 22, 23, 45-47, as shown in FIG. 48, in another embodiment of the present disclosure, still taking the case that the guide portion 270 has a ring structure as an example, the guide portion 270 can be provided with three flow passages 2105. Through the above structural design, the present disclosure can improve the balance of the fluid flowing between the valve cavity 101 and the flow cavity 2101 via the flow passage 2105, and can make the stress on the first valve needle 210 more uniform, further ensuring the stability of the stress on the components. In some embodiments, the guide portion 270 can also be provided with two, four, or more than four flow passages 2105, and is not limited to this embodiment.

[0220] As shown in FIG. 48, based on the structural design that the guide portion 270 is provided with at least two flow-through passages 2105, in another embodiment of the present disclosure, the at least two flow-through passages 2105 can be uniformly distributed in the circumferential direction. Through the above-mentioned structural design, the present disclosure can further improve the balance of the fluid flowing between the valve cavity 101 and the flow-through cavity 2101 via the flow-through passages 2105.

[0221] Referring to FIG. 49, FIG. 49 represents a top view of the first valve needle 210 (e.g., the first assembly 211) of the electronic expansion valve capable of embodying the principles of the present disclosure in another exemplary embodiment.

[0222] Unlike the structural design that the flow-through passage 2105 is a through hole in the embodiments shown in FIGS. 22, 23, 45-47, or 48, as shown in FIG. 49, in another embodiment of the present disclosure, the flow-through passage 2105 can be a through slot, where “through” means that it penetrates the guide portion 270 in the axial direction, and “slot” means that it is open to the side facing the guide hole 2702 and communicates with the guide hole 2702, in other words, the slot of the through slot communicates with the guide hole 2702. In other words, the guide hole 2702 and the through slot adopt an integrated hole structure. Through the above-mentioned structural design, the present disclosure can reduce the structural complexity of the first valve needle 210, facilitating processing.

[0223] As shown in FIG. 49, and referring to FIG. 45 simultaneously, in the above-mentioned embodiments of the present disclosure, the outer periphery of the second valve needle 220 can be provided with a transmission portion 221. Specifically, the transmission portion 221 is located in the flow-through cavity 2101, and in the axial direction, the thickness of the transmission portion 221 is less than the height of the flow-through cavity 2101. On this basis, the driving assembly 400 can drive the second valve needle 220 to move away from the first valve port 1011, so that the transmission portion 221 abuts against the cavity wall of the flow-through cavity 2101 away from the first valve port 1011, to drive the first valve needle 210 to move away from the first valve port 1011.

[0224] Unlike the structural design that the guide portion 270 adopts a ring structure in the embodiments shown in FIGS. 45-49, in an embodiment of the present disclosure not shown in the drawings, the guide portion 270 can also adopt a non-closed structure, for example, an arc structure, whereby the portion between the second valve needle 220 and the opening of the flow-through cavity 2101 not occupied by the guide portion 270 in the circumferential direction can form a flow-through passage 2105.

[0225] Based on the structural design that the guide portion 270 adopts a non-closed structure, in an embodiment of the present disclosure not shown in the drawings, the valve core assembly 200 can include at least two guide portions 270, and the at least two guide portions 270 are arranged in the circumferential direction with a spacing, and form at least two flow-through passages 2105 arranged in the circumferential direction with a spacing.

[0226] Based on the non-closed structure design of the guide portion 270, in an embodiment not shown in the disclosure, at least two guide portions 270 can be uniformly distributed in the circumferential direction.

[0227] As shown in FIG. 45 and FIG. 22, in an embodiment of the disclosure, the first valve needle 210 can include a first assembly body 211 and a second assembly body 212. Specifically, the first assembly body 211 is assembled and connected with the second assembly body 212, for example, crimping, 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 side of the first assembly body 211 facing the first valve port 1011 can be provided with a groove, and the groove and the side of the second assembly body 212 away from the first valve port 1011 together form a flow-through cavity 2101, that is, the groove participates in forming at least part of the cavity of the flow-through cavity 2101. And the flow-through passage 2105 is provided on the first assembly body 211, and the transverse passage 2103, the second valve port 2102 and the longitudinal passage 2104 are provided on the second assembly body 212. Through the above structural design, the disclosure can improve the structural rationality of the first valve needle 210, and realize the formation of each passage and cavity of the first valve needle 210 with fewer number of parts and simpler part structure, and the structure is more reasonable, which is convenient for processing and assembly.

[0228] It should be noted that the electronic expansion valve shown in the drawings and described in the specification is only a few examples of many electronic expansion valves that can employ 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 or any components of the electronic expansion valve shown in the drawings or described in the specification.

[0229] In summary, the electronic expansion valve provided by the present disclosure comprises a valve seat assembly 100 and a valve core assembly 200. The valve cavity 101 of the valve seat assembly 100 is provided with a first valve port 1011. The valve core assembly 200 comprises a first valve needle 210 and a second valve needle 220. One end of the first valve needle 210 is in sealing cooperation with the first valve port 1011. The first valve needle 210 is internally provided with a flow-through cavity 2101, a transverse channel 2103, a second valve port 2102, and a longitudinal channel 2104. The flow-through cavity 2101 is located on the side of the longitudinal channel 2104 away from the first valve port 1011. One end of the transverse channel 2103 is open on the side surface of the first valve needle 210. One end of the second valve port 2102 is communicated with the flow-through cavity 2101, and the other end is communicated with the transverse channel 2103. One end of the longitudinal channel 2104 is open on the end surface of the first valve needle 210 facing the first valve port 1011, and the other end is communicated with the flow-through cavity 2101. Part of the second valve needle 220 is inserted into the flow-through cavity 2101, and one end of the second valve needle 220 facing the first valve port 1011 is in sealing cooperation with the second valve port 2102. Through the above design, when the second valve port 2102 is opened, the present disclosure can realize that the throttled refrigerant first flows through the flow-through cavity 2101 of the first valve needle 210 and then flows out of the first valve port 1011, for example, the throttled refrigerant flows through the flow-out path of the transverse channel 2103, the second valve port 2102, the flow-through cavity 2101, the longitudinal channel 2104, and the first valve port 1011 in sequence. Accordingly, the second valve needle 220 realizes a non-inner balance structure. Compared with the existing scheme that a small valve needle adopts an inner balance structure, the present disclosure can utilize the longitudinal channel 2104 as a flow-through path and a balance channel at the same time, thereby avoiding that the longitudinal channel 2104 is blocked by the oil in the valve cavity 101. At the same time, the present disclosure sequentially connects the transverse channel 2103, the second valve port 2102, the flow-through cavity 2101, and the longitudinal channel 2104 to form a flow-through path of fluid. On this basis, since one end of the second valve port 2102 is open toward the flow-through cavity 2101 rather than toward the first valve port 1011, when the second valve port 2102 is closed, even if there is no sealing element between the second valve needle 220 and the first valve needle 210, the fluid entering the first valve needle 210 will be shut off by the second valve needle 220, ensuring that the flow rate of the second valve port 2102 is zero flow rate. Accordingly, it can be avoided to set an additional sealing element between the first valve needle 210 and the second valve needle 220, the number of parts of the electronic expansion valve can be reduced, and the structural complexity can be reduced. Since the setting of the above sealing element is avoided, the present disclosure also does not need to weld the corresponding pressure plate for fixing the sealing element, the welding process can be reduced, and the production efficiency of the product can be improved.

[0230] While the disclosure has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. As previously mentioned, changes and modifications can be made to the above-described embodiments without departing from the spirit or scope of the disclosure. Therefore, it is made clear that the above-mentioned embodiments are illustrative only and not restrictive, and that the scope of the disclosure is not limited to any of the above-mentioned details, but is defined by the appended claims and their equivalents.

Claims

1. An electronic expansion valve characterized by, The valve seat assembly (100) is internally provided with a valve cavity (101) provided with a first valve port (1011); the valve core assembly (200) comprises: a first valve needle (210) arranged in the valve cavity (101); one end of the first valve needle (210) is in sealing cooperation with the first valve port (1011); the first valve needle (210) is internally provided with a flow-through cavity (2101), a transverse channel (2103), a second valve port (2102) and a longitudinal channel (2104); the flow-through cavity (2101) is located on the side of the transverse channel (2103) and the longitudinal channel (2104) away from the first valve port (1011); at least one end of the transverse channel (2103) is open to the side surface of the first valve needle (210); one end of the second valve port (2102) is communicated with the flow-through cavity (2101), and the other end is communicated with the transverse channel (2103); one end of the longitudinal channel (2104) is open to the end surface of the first valve needle (210) facing the first valve port (1011), and the other end is communicated with the flow-through cavity (2101); and a second valve needle (220) partially inserted into the flow-through cavity (2101), one end of the second valve needle (220) facing the first valve port (1011) is in sealing cooperation with the second valve port (2102); and a driving assembly (400) for driving the first valve needle (210) and the second valve needle (220) to move axially to realize the opening and closing control of the first valve port (1011) and the second valve port (2102). The first valve needle (210) comprises a first assembly body (211) and a second assembly body (212) arranged separately and connected with each other, the side of the first assembly body (211) facing the first valve port (1011) is provided with a groove, and the groove and the side of the second assembly body (212) away from the first valve port (1011) jointly form the flow-through cavity (2101); the transverse channel (2103), the second valve port (2102) and the longitudinal channel (2104) are arranged in the second assembly body (212). The valve core sealing ring (213) is arranged between the first valve needle (210) and the valve seat assembly (100), the part of the valve cavity (101) on the side of the valve core sealing ring (213) away from the first valve port (1011) is a back pressure cavity (1014); the first valve needle (210) is provided with a balance channel, both ends of the balance channel are communicated with the first valve port (1011) and the back pressure cavity (1014) respectively; the balance channel comprises the longitudinal channel (2104) and a flow-through channel (2105) arranged in the first valve needle (210); one end of the flow-through channel (2105) is communicated with the flow-through cavity (2101), and the other end is open to be communicated with the back pressure cavity (1014).

2. The electronic expansion valve according to claim 1, characterized in that 4. The electronic expansion valve according to claim 3, characterized in that:

3. The electronic expansion valve according to claim 1, wherein ​ ​ The valve core sealing ring (213) is installed on the first valve needle (210); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the valve seat assembly (100) is S1, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S1=S3+S4; or The valve core sealing ring (213) is installed on the valve seat assembly (100); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the first valve needle (210) is S2, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S2=S3+S4.

5. The electronic expansion valve according to claim 3, wherein: The valve core sealing ring (213) is installed on the first valve needle (210); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the valve seat assembly (100) is S1, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S1=S3+S4; or The valve core sealing ring (213) is installed on the valve seat assembly (100); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the first valve needle (210) is S2, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S2=S3+S4.

6. The electronic expansion valve according to claim 3, wherein: The valve core sealing ring (213) is installed on the first valve needle (210); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the valve seat assembly (100) is S1, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S1=S3+S4; or The valve core sealing ring (213) is arranged on the valve seat assembly (100); the circular area corresponding to the sealing area between the valve core sealing ring (213) and the first valve needle (210) is S2, the circular area corresponding to the sealing area between the first valve needle (210) and the first valve port (1011) is S3, and the circular area corresponding to the sealing area between the second valve needle (220) and the second valve port (2102) is S4; wherein S2>S3+S4.

7. The electronic expansion valve according to claim 3, wherein The first valve needle (210) is provided with a through hole (2106) for the second valve needle (220) to pass through; wherein the flow channel (2105) and the through hole (2106) are in circumferential communication to form an integrated hole structure, or the flow channel (2105) and the through hole (2106) are arranged in a spaced manner.

8. The electronic expansion valve according to claim 1, wherein The second valve port (2102) is located at the axial center position of the first valve needle (210), and the extension direction of the transverse channel (2103) is the radial direction of the first valve needle (210); the first valve needle (210) is provided with at least one transverse channel (2103) penetrating the first valve needle (210) in the radial direction, both ends of the transverse channel (2103) are open to the side surface of the first valve needle (210), and the second valve port (2102) is connected to the middle position of the transverse channel (2103).

9. The electronic expansion valve according to claim 8, characterized in that The number of longitudinal channels (2104) located on both sides of the transverse channel (2103) is equal; wherein a reference plane parallel to the radial direction and perpendicular to the axial direction is defined, and on the reference plane, the orthogonal projections of the longitudinal channels (2104) located on both sides of the transverse channel (2103) are arranged in axial symmetry, and the symmetry axis is the center line of the orthogonal projection of the transverse channel (2103).

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that The electronic expansion valve further comprises a first elastic member (410) connected between one end of the first valve needle (210) away from the first valve port (1011) and the valve seat assembly (100); wherein the first valve needle (210) is provided with a containing groove (2107) at the end away from the first valve port (1011), and the first elastic member (410) is partially contained in the containing groove (2107).

11. The electronic expansion valve according to any one of claims 1 to 9, characterized in that The electronic expansion valve further comprises a second elastic member (420); wherein the drive assembly (400) comprises a first screw rod (430) and a spring sleeve (440); the second valve needle (220) is fixedly connected with the spring sleeve (440), the spring sleeve (440) is limitingly connected with the first screw rod (430) and can move axially relative to the spring sleeve (440); the second elastic member (420) is located in the spring sleeve (440) and between the second valve needle (220) and the first screw rod (430).

12. The electronic expansion valve according to any one of claims 1 to 9, characterized in that The electronic expansion valve further comprises a second elastic member (420); wherein the electronic expansion valve further comprises a support seat (130) connected to the valve seat assembly (100); the drive assembly (400) comprises a second screw rod (450), and the second elastic member (420) is sleeved outside the second screw rod (450) and located between the support seat (130) and the second screw rod (450).

13. The electronic expansion valve according to any one of claims 1 to 9, characterized in that An end of the first valve needle (210) facing the first valve port (1011) is provided with a first sealing structure, and the first sealing structure comprises a first sealing ring (231), and a material hardness of the first sealing ring (231) is less than a material hardness of the first valve port (1011); when the first valve port (1011) is closed, the first valve needle (210) is in contact with the first valve port (1011) through the first sealing ring (231).

14. The electronic expansion valve according to any one of claims 1 to 9, characterized in that When the first valve port (1011) is closed, the first valve needle (210) is in direct contact with the first valve port (1011).

15. The electronic expansion valve according to any one of claims 1-9, characterized in that: The second valve port (2102) is provided with a second sealing ring (241), and a material hardness of the second sealing ring (241) is less than a material hardness of the second valve needle (220); when the second valve port (2102) is closed, the second sealing ring (241) is in contact with the second valve needle (220); or An end of the second valve needle (220) facing the first valve needle (210) is provided with a sealing head (242), and a material hardness of the sealing head (242) is less than a material hardness of the second valve port (2102); when the second valve port (2102) is closed, the sealing head (242) is in contact with the second valve port (2102); or When the second valve port (2102) is closed, the second valve needle (220) is in direct contact with the second valve port (2102).

16. The electronic expansion valve of claim 1, wherein The valve core assembly (200) comprises a flow guide groove body (260) in the form of an annular groove structure, the flow guide groove body (260) is arranged on the first valve needle (210), a groove opening of the flow guide groove body (260) faces a part of the first valve needle (210) and is closed by the part of the first valve needle (210), a groove wall of the flow guide groove body (260) is provided with a flow guide hole (261), at least one flow guide hole (261) corresponds to or is staggered with at least one transverse channel (2103) in a circumferential direction; the transverse channel (2103) is connected with the valve cavity (101) via a groove cavity of the flow guide groove body (260) and the flow guide hole (261); the groove wall of the flow guide groove body (260) comprises a bottom wall (2601), and the flow guide hole (261) is arranged on the bottom wall (2601) so that fluid flows in a radial direction between the flow guide groove body (260) and the valve cavity (101).

17. The electronic expansion valve of claim 1, wherein, The first valve needle (210) is provided with at least two lateral channels (2103), and the other ends of the at least two lateral channels (2103) are connected together and communicate with the second valve port (2102).

18. Electronic expansion valve according to claim 16 or 17, characterized in that The first valve needle (210) comprises a first assembly body (211) and a second assembly body (212) which are separately arranged and connected to each other, the first assembly body (211) is provided with a groove on the side facing the first valve port (1011), and the groove and the side of the second assembly body (212) away from the first valve port (1011) jointly form a flow passage (2101); and the drainage groove body (260) is located at one end of the first assembly body (211) close to the first valve port (1011).

19. The electronic expansion valve according to claim 16 or 17, characterized in that The first valve needle (210) is provided with a first sealing ring (231) on the outer periphery, the material hardness of the first sealing ring (231) is less than that of the first valve port (1011), and the first sealing ring (231) is in contact with the first valve port (1011) when the first valve port (1011) is closed, so as to realize soft sealing; the periphery of one end of the first valve needle (210) close to the first valve port (1011) is provided with a sealing boss (2121), the drainage groove body (260) is located on the side of the sealing boss (2121) away from the first valve port (1011) in the axial direction, and the first sealing ring (231) is clamped between the drainage groove body (260) and the sealing boss (2121) in the axial direction.

20. The electronic expansion valve of claim 1, wherein, The first valve needle (210) is provided with a guide portion (270) located at the opening of the flow passage (2101) and having a guide surface (2701); the guide surface (2701) is matched with the shape of at least part of the outer periphery of the second valve needle (220) to guide the second valve needle (220); the drive assembly (400) comprises a first screw rod (430) connected to the second valve needle (220), and the first screw rod (430) can drive the second valve needle (220) to move in the axial direction relative to the first valve needle (210) to realize the opening and closing control of the first valve port (1011) and the second valve port (2102).

21. The electronic expansion valve of claim 20, wherein, A valve core sealing ring (213) is arranged between the first valve needle (210) and the valve seat assembly (100), the part of the valve cavity (101) on the side of the valve core sealing ring (213) away from the first valve port (1011) is a back pressure cavity (1014); the first valve needle (210) is provided with a balance channel, and the two ends of the balance channel communicate with the first valve port (1011) and the back pressure cavity (1014) respectively; and the gap between the guide surface (2701) and the second valve needle (220) respectively communicates with the back pressure cavity (1014) and the flow passage (2101).

22. The electronic expansion valve of claim 21, wherein, The balance channel comprises a flow channel (2105) arranged on the first valve needle (210), a flow cavity (2101) is located between the flow channel (2105) and the longitudinal channel (2104), and the flow channel (2105) communicates the flow cavity (2101) with the back pressure cavity (1014); the longitudinal channel (2104) communicates the first valve port (1011) with the flow cavity (2101).

23. The electronic expansion valve of claim 22, wherein, In the circumferential direction, the part between the second valve needle (220) and the opening of the flow cavity (2101) which is not occupied by the guide part (270) forms the flow channel (2105).

24. The electronic expansion valve of claim 23, wherein, The valve core assembly (200) comprises at least two guide parts (270), and the at least two guide parts (270) are arranged in the circumferential direction and form at least two flow channels (2105) arranged in the circumferential direction at intervals.

25. The electronic expansion valve of claim 22, wherein, The guide part (270) has an annular structure, a guide hole (2702) is formed in the middle of the guide part (270), the hole wall of the guide hole (2702) is the guide surface (2701), and the second valve needle (220) is arranged in the guide hole (2702); wherein the flow channel (2105) is arranged on the guide part (270), and the flow channel (2105) penetrates the guide part (270) in the axial direction.

26. The electronic expansion valve of claim 25, wherein, The flow channel (2105) is a through hole, and the through hole is arranged at intervals with the guide hole (2702).

27. The electronic expansion valve of claim 25, wherein, The flow channel (2105) is a through slot, and the slot opening of the through slot is communicated with the guide hole (2702).

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