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CN-121977308-A - Electronic expansion valve

CN121977308ACN 121977308 ACN121977308 ACN 121977308ACN-121977308-A

Abstract

The invention provides an electronic expansion valve which comprises a valve body, a guide piece, a check valve core, a valve needle and a second interface, wherein the valve body is provided with a valve cavity, a large valve port, a first interface and a second interface, the guide piece is arranged in the valve cavity, the guide piece is arranged on the inner wall of the valve body in a protruding mode along the radial direction of the electronic expansion valve, the guide piece is provided with a small valve port and a guide hole, the flow area of the large valve port is larger than that of the small valve port, the check valve core is internally provided with a through valve core channel, at least part of the check valve core is axially movably arranged in the guide hole and is positioned between the first interface and the large valve port, the check valve core is used for opening and closing the large valve port, the valve needle is axially movably arranged in the valve cavity, the valve needle can move along the axial direction of the electronic expansion valve in the forward flow state so as to adjust the flow of the small valve port, and the second interface, the large valve port and the first interface can be sequentially communicated in the reverse flow state. By the adoption of the scheme, the problem that the existing electronic expansion valve cannot meet the requirement of large circulation capacity in reverse circulation is solved.

Inventors

  • HUANG HONGFENG
  • ZHAO JUN
  • XU GUANJUN
  • WANG YI

Assignees

  • 浙江盾安人工环境股份有限公司

Dates

Publication Date
20260505
Application Date
20260403

Claims (14)

  1. 1. An electronic expansion valve, comprising: A valve body (10), wherein the valve body (10) is provided with a valve cavity (11), a large valve port (12), a first interface (13) and a second interface (14); the guide piece (40) is arranged in the valve cavity (11), the guide piece (40) is arranged on the inner wall of the valve body (10) in a protruding mode along the radial direction of the electronic expansion valve, the guide piece (40) is provided with a small valve port (41) and a guide hole (44), and the flow area of the large valve port (12) is larger than that of the small valve port (41); The unidirectional valve core (20) is internally provided with a through valve core channel (21), at least part of the unidirectional valve core (20) is axially movably arranged in the guide hole (44) and is positioned between the first interface (13) and the large valve port (12), and the unidirectional valve core (20) is used for opening and closing the large valve port (12); A valve needle (30) axially movably arranged in the valve cavity (11), the valve needle (30) being used for adjusting the flow rate of the small valve port (41); The electronic expansion valve is provided with a forward circulation state and a reverse circulation state, in the forward circulation state, the first interface (13) inputs fluid to the valve cavity (11), the one-way valve core (20) closes the large valve port (12) under the driving of pressure difference force, the valve needle (30) can move along the axial direction of the electronic expansion valve so as to adjust the flow of the small valve port (41), in the reverse circulation state, the second interface (14) inputs fluid to the valve cavity (11), the one-way valve core (20) moves under the driving of pressure difference force and opens the large valve port (12), and the second interface (14), the large valve port (12) and the first interface (13) can be communicated sequentially.
  2. 2. The electronic expansion valve according to claim 1, characterized in that the one-way valve core (20) has a first limit position along the axial direction of the electronic expansion valve, the one-way valve core (20) is in the first limit position when the one-way valve core (20) is abutted against the large valve port (12), and when the one-way valve core (20) is in the first limit position, a gap is formed between the inner wall of the valve core channel (21) and the valve needle (30) when the valve needle (30) is abutted against the small valve port (41).
  3. 3. The electronic expansion valve according to claim 1, wherein the check valve element (20) has a second limit position along an axial direction of the electronic expansion valve, the check valve element (20) is in the second limit position when moving to a position abutting against the guide member (40) after opening the large valve port (12), and when the check valve element (20) is in the second limit position, and when the valve needle (30) abuts against the small valve port (41), a gap is formed between an inner wall of the valve element passage (21) and the valve needle (30).
  4. 4. The electronic expansion valve according to claim 1, wherein the check valve cartridge (20) includes a valve cartridge body (22) and a stopper portion provided on an outer peripheral surface of the valve cartridge body (22), a surface of the stopper portion facing the guide member (40) being capable of stopper-engaging with a lower surface (47) of the guide member (40) facing the large valve port (12) to restrict a position of the check valve cartridge (20) away from the large valve port (12).
  5. 5. The electronic expansion valve according to claim 1, wherein the diameter of the small valve port (41) is smaller than the diameter of the guide hole (44), a stop surface (45) is formed between the small valve port (41) and the guide hole (44), and the end surface of the one-way valve core (20) on the side far away from the large valve port (12) can be in stop fit with the stop surface (45) so as to limit the position of the one-way valve core (20) far away from the large valve port (12).
  6. 6. The electronic expansion valve according to claim 1, wherein a lower surface (47) of the guide member (40) and a bottom wall of the valve chamber (11) are arranged at intervals along an axial direction, a circulation cavity (111) is arranged between the lower end of the guide member (40) and the bottom wall of the valve chamber (11), the guide member (40) comprises a guide main body (42) and a circulation portion (43), the small valve port (41) and the guide hole (44) are coaxially arranged, the circulation portion (43) is arranged in the guide main body (42), the circulation portion (43) is arranged on the radial outer side of the guide main body (42), the circulation portion (43) is provided with a circulation channel penetrating along the axial direction of the electronic expansion valve, the circulation area of the circulation channel is larger than the minimum circulation area of the large valve port (12), and the second interface (14), the large valve port (12), the circulation cavity (111), the circulation channel and the first interface (13) can be sequentially communicated in the reverse circulation state.
  7. 7. The electronic expansion valve of claim 6, wherein, The guide piece (40) and the valve body (10) are integrally arranged, and the circulation channel is an opening in the axial direction of the guide piece (40); Or the guide piece (40) and the valve body (10) are arranged in a split mode, the guide piece (40) is fixedly connected with the valve body (10), the circulation channel is an opening in the axial direction of the guide piece (40), and/or the circulation channel is a circulation groove formed in the outer wall of the guide piece (40).
  8. 8. The electronic expansion valve according to claim 6, wherein the flow-through portion (43) includes a plurality of flow-dividing blocks (431), the plurality of flow-dividing blocks (431) being disposed at intervals radially outside the guide body (42), a cavity between two adjacent flow-dividing blocks (431) forming the flow-through passage; Or, the flow-through portion (43) has a plurality of flow-through holes, the plurality of flow-through holes are arranged at intervals around the radial outside of the guide body (42), and the plurality of flow-through holes form the flow-through passage.
  9. 9. The electronic expansion valve according to claim 8, wherein when the flow-through portion (43) includes a plurality of the flow-dividing blocks (431), the flow-dividing blocks (431) are of a fan-shaped structure, the outer peripheral surface of the guide main body (42) is of a circular arc shape, the small ends of the flow-dividing blocks (431) are connected with the outer peripheral surface of the guide main body (42), and the large ends of the flow-dividing blocks (431) are connected with the inner wall of the valve chamber (11).
  10. 10. The electronic expansion valve according to claim 1, wherein the valve needle (30) comprises a cylindrical body (31) and a conical body (32), a large end of the conical body (32) is connected with one end of the cylindrical body (31), an inner diameter of the small valve port (41) is smaller than an outer diameter of the cylindrical body (31), and the conical body (32) is used for opening and closing the small valve port (41) and adjusting an opening degree of the small valve port (41).
  11. 11. The electronic expansion valve according to claim 10, characterized in that the guide member (40) has a first fitting cone surface (46), the first fitting cone surface (46) being located at an end of the small valve port (41) remote from the large valve port (12), the first fitting cone surface (46) being for fitting with an outer peripheral surface of the cone (32) to close the small valve port (41), or the small valve port (41) being a straight hole, a peripheral edge of which is for fitting with an outer peripheral surface of the cone (32) to close the small valve port (41).
  12. 12. The electronic expansion valve of claim 10, wherein said large valve port (12) is a tapered port having a tapered surface (121), said one-way valve element (20) has a second mating tapered surface (23), said second mating tapered surface (23) being located at an end of said one-way valve element (20) adjacent to said large valve port (12), said second mating tapered surface (23) being adapted to mate with said tapered surface (121) to close said large valve port (12), or said large valve port (12) is a straight bore having a periphery adapted to mate with said tapered surface (121) to close said large valve port (12).
  13. 13. The electronic expansion valve according to claim 1, wherein the valve body (10) further comprises a limiting structure (50), the limiting structure (50) is disposed on an inner wall of the valve chamber (11), and an end surface of the guide member (40) abuts against the limiting structure (50).
  14. 14. The electronic expansion valve according to claim 1, further comprising a driving member (61), an outer housing (62), a first connecting tube (63) and a second connecting tube (64), wherein the outer housing (62) is connected with the valve body (10), the driving member (61) is movably arranged in a cavity of the outer housing (62), the driving member (61) drives the valve needle (30) to move, the first connecting tube (63) is mounted on the valve body (10) and is communicated with the valve cavity (11), and the second connecting tube (64) is mounted on the valve body (10) and is communicated with the large valve port (12).

Description

Electronic expansion valve Technical Field The invention relates to the technical field of valves, in particular to an electronic expansion valve. Background In refrigeration, air conditioning and heat pump systems, electronic expansion valves are used as important flow regulating elements, the performance of which is directly related to the energy efficiency and the operational stability of the system. With the development of heat pump systems and air conditioning systems including mode switching for cooling and heating, electronic expansion valves are generally required to satisfy the forward and reverse flow of a fluid medium therein. In order to meet specific flow requirements, forward small flow regulation and reverse large flow circulation are realized, in the related technology, certain electronic expansion valves are integrated with one-way valve cores, the electronic expansion valves are provided with valve bodies, valve needles and one-way valve cores, large valve ports are arranged on the valve bodies, small valve ports are arranged on the one-way valve cores, when the electronic expansion valves are in a forward circulation state, the one-way valve cores close the large valve ports under the action of fluid pressure difference, and the valve needles move along the axial direction of the electronic expansion valves so as to regulate the flow of the small valve ports; when the electronic expansion valve is in a fully closed state, the one-way valve core and the valve needle are respectively plugged at the large valve port and the small valve port, when the electronic expansion valve is in the fully closed state, the flow direction of fluid in the electronic expansion valve is switched from forward circulation to reverse circulation, the one-way valve core has a trend of moving away from the large valve port under the action of pressure difference, however, because the valve needle is abutted with the small valve port, the axial position of the valve needle can interfere the movement of the one-way valve core, at the moment, the valve needle is required to be moved upwards, the one-way valve core can be abutted with the valve needle only when the valve needle is moved upwards, or the logic of fully opening the valve needle is not designed when a part of the system is used reversely, so that the axial position of the valve needle can influence the movement position of the one-way valve core when the electronic expansion valve is in reverse circulation, thereby influencing the opening of the large valve port, and reducing the response speed of the valve opening when the refrigerant flows reversely. Disclosure of Invention The invention provides an electronic expansion valve, which solves the problem that the existing electronic expansion valve cannot meet the requirement of large circulation capacity in reverse circulation. According to one aspect of the present invention, there is provided an electronic expansion valve comprising: The guide piece is arranged in the valve cavity, protrudes out of the inner wall of the valve body along the radial direction of the electronic expansion valve, is provided with a small valve port and a guide hole, and the flow area of the large valve port is larger than that of the small valve port; The unidirectional valve core is internally provided with a through valve core channel, at least part of the unidirectional valve core is axially movably arranged in the guide hole and positioned between the first interface and the large valve port, and the unidirectional valve core is used for opening and closing the large valve port; The valve needle can be axially movably arranged in the valve cavity and is used for adjusting the flow of the small valve port; The electronic expansion valve is provided with a forward circulation state and a reverse circulation state, in the forward circulation state, a first interface inputs fluid to the valve cavity, the one-way valve core closes the large valve port under the drive of pressure difference force, the valve needle can move along the axial direction of the electronic expansion valve to adjust the flow of the small valve port, in the reverse circulation state, a second interface inputs fluid to the valve cavity, the one-way valve core moves under the drive of pressure difference force and opens the large valve port, and the second interface, the large valve port and the first interface can be communicated in sequence. Further, the one-way valve core is provided with a first limit position along the axial direction of the electronic expansion valve, the one-way valve core is positioned at the first limit position when the one-way valve core is abutted against the big valve port, and a gap is reserved between the inner wall of a valve core channel and the valve needle when the valve needle is abutted against the small valve port under the condition that the one-way valve core is positioned at the first limit position. The valve c