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CN-224230396-U - Electronic expansion valve

CN224230396UCN 224230396 UCN224230396 UCN 224230396UCN-224230396-U

Abstract

The invention provides an electronic expansion valve which comprises a valve seat assembly, a valve core assembly and a driving assembly, wherein the valve seat assembly is provided with a first valve port, a first valve hole and a second valve hole which is closer to the first valve port, the valve core assembly comprises a first valve needle and a second valve needle, the first valve needle is in sealing fit with the first valve port, a fluid passage is arranged in the valve core assembly, the fluid passage is provided with the second valve port, one end of the fluid passage is communicated with the first valve hole, the other end of the fluid passage is communicated with the first valve port, a transverse passage is opened on the side surface of the first valve needle, a longitudinal passage axially penetrates through the second valve port, the other end of the second valve needle is communicated with the transverse passage, the second valve needle is in sealing fit with the second valve port, and the driving assembly is used for driving the first valve needle and the second valve needle to axially move so as to control the first valve port and the second valve port.

Inventors

  • YANG ZHONGYU
  • CAI PEIYU
  • CHAI HUILIAN

Assignees

  • 盾安汽车热管理科技有限公司

Dates

Publication Date
20260512
Application Date
20250424

Claims (18)

  1. 1. An electronic expansion valve, comprising: The valve seat assembly (100) is internally provided with a valve cavity (101), and the valve seat assembly (100) is provided with a first valve port (102), a first valve hole (103) and a second valve hole (104) which is close to the first valve port (102) than the first valve hole (103); A spool assembly (200) comprising: A first valve needle (210) arranged in the valve cavity (101), one end part of the first valve needle (210) is in sealing fit with the first valve port (102), a fluid passage is arranged in the first valve needle (210), a second valve port (2103) is arranged in the fluid passage, one end of the fluid passage is communicated with the first valve hole (103), the other end of the fluid passage is communicated with the first valve port (102), and A second valve needle (220) arranged in the valve cavity (101), an end part of the second valve needle (220) facing the first valve port (102) is in sealing fit with the second valve port (2103), and A driving assembly (300) for driving the first valve needle (210) and the second valve needle (220) to move along the axial direction so as to realize the opening and closing control of the first valve port (102) and the second valve port (2103); The valve comprises a first valve opening (102), a second valve opening (2103), a first valve opening (102) and a second valve opening (2103), wherein when the first valve opening (102) is closed and the second valve opening (2103) is opened, the first valve opening (102) is separated from the second valve opening (104), the first valve opening (102) is connected with the first valve opening (104) when the first valve opening (102) is opened and the second valve opening (2103) is closed, the first valve opening (102) is separated from the first valve opening (103), and when the first valve opening (102) is closed and the second valve opening (2103) is closed, the second valve opening (104) is separated from the first valve opening (102), and the first valve opening (102) is separated from the first valve opening (103).
  2. 2. The electronic expansion valve of claim 1, wherein the fluid pathway comprises a transverse channel (2101), a longitudinal channel (2102) and a valve port channel disposed inside a first valve needle (210), wherein the second valve port (2103) is located in the valve port channel, wherein at least one end of the transverse channel (2101) is open to a side surface of the first valve needle (210), wherein the longitudinal channel (2102) axially penetrates the first valve needle (210), wherein the valve port channel communicates an end of the first valve needle (210) facing away from the first valve port (102) with the transverse channel (2101), wherein an end of the first valve needle (210) facing away from the first valve port (102) is communicated with the first valve port (102) through the longitudinal channel (2102), and wherein the first valve needle (210) comprises: A body part (211) provided in the valve chamber (101) and provided with the lateral passage (2101) and the valve port passage, and An extension part (212), one end part of which is connected with the body part (211), and the other end part of which is provided with a sealing structure, wherein when the first valve port (102) is closed, the sealing structure is sealed on the first valve port (102); Wherein the body portion (211) is provided with a first sub-channel (2111) penetrating in the axial direction, the extension portion (212) is provided with a second sub-channel (2121) penetrating in the axial direction, and the first sub-channel (2111) is communicated with the second sub-channel (2121) to form the longitudinal channel (2102).
  3. 3. The electronic expansion valve of claim 2, wherein the valve port channel does not extend through the body portion (211).
  4. 4. The electronic expansion valve according to claim 2, wherein the outer wall surface of the extension portion (212) is provided with an annular groove, and the groove depth of the portions of the groove at both ends in the axial direction is smaller than the groove depth of the middle portion of the groove.
  5. 5. The electronic expansion valve according to claim 2, wherein the body portion (211) is provided with at least two first sub-channels (2111), the end portion of the second sub-channel (2121) adjacent to the body portion (211) is provided with an open structure (21211), the inner diameter of the open structure (21211) is larger than the inner diameter of the second sub-channel (2121), and the second sub-channel (2121) communicates with at least two first sub-channels (2111) simultaneously via the open structure (21211).
  6. 6. The electronic expansion valve according to claim 2, wherein a first groove is formed in an end face of the body portion (211) facing the extension portion (212), the end face of the extension portion (212) facing the body portion (211) is connected to the body portion (211), the first sub-channel (2111) is opened at a bottom of the first groove, the second sub-channel (2121) is opened at an end face of the extension portion (212) facing the body portion (211), and a distance between the bottom of the first groove and the end face of the body portion (211) is greater than or equal to zero.
  7. 7. The electronic expansion valve according to claim 6, characterized in that an end surface of the extension portion (212) facing the body portion (211) is provided with a projection, which is accommodated in the first groove, and the second sub-passage (2121) opens to an end surface of the projection facing the body portion (211).
  8. 8. The electronic expansion valve of claim 1, wherein an end of the first valve needle (210) facing away from the second valve needle (220) extends beyond the first valve port (102) and is provided with a sealing structure, the sealing structure sealing against a side of the first valve port (102) facing away from the second valve port (2103) when the first valve port (102) is closed, wherein the first valve needle (210) is provided with a flow regulating segment adjacent to a side of the sealing structure adjacent to the first valve port (102), and a flow regulating slope (2104) is provided at an outer periphery of the flow regulating segment such that an outer diameter of the flow regulating segment decreases in a direction axially away from the sealing structure.
  9. 9. The electronic expansion valve of claim 1, characterized in that a first sealing ring (230) and a second sealing ring (240) are arranged between the first valve needle (210) and the valve seat assembly (100), the first sealing ring (230) is positioned on one side of the first valve hole (103) away from the second valve hole (104), and the second sealing ring (240) is positioned between the first valve hole (103) and the second valve hole (104).
  10. 10. The electronic expansion valve of claim 1, the electronic expansion valve is characterized by further comprising: The valve comprises a valve cavity (101), a first elastic piece (410), a first limiting plate (215) and a first elastic piece (410), wherein the first elastic piece (410) is positioned in the valve cavity (101) and used for providing a pretightening force when the first valve needle (210) closes the first valve port (102), one end of the first valve needle (210) is in sealing fit with the first valve port (102), the other end of the first valve needle (210) is provided with the first limiting plate (215), the first limiting plate (215) extends away from the first valve needle (210) in the radial direction, and the first elastic piece (410) is positioned between the first limiting plate (215) and the inner wall of the valve cavity (101).
  11. 11. The electronic expansion valve of claim 10, wherein the valve seat assembly (100) includes a first valve seat (110) and a second valve seat (120), at least a portion of the second valve seat (120) extending into the first valve seat (110), the first valve needle (210) being axially movable relative to an inner wall of the second valve seat (120), the first elastic member (410) being located in a gap between a portion of the second valve seat (120) extending into the first valve seat (110) and the first valve seat (110).
  12. 12. The electronic expansion valve of claim 1, the electronic expansion valve is characterized by further comprising: The driving assembly (300) comprises a valve rod (310), the valve rod (310) can move axially and is used for pushing and pulling the second valve needle (220) to move axially, the end portion, facing the valve rod (310), of the second valve needle (220) is connected with a pressing sleeve (222), the pressing sleeve (222) and the second valve needle (220) form a containing cavity (2221) together, the end portion, facing the second valve needle (220), of the valve rod (310) stretches into the containing cavity (2221) and is provided with a limiting portion (311), the limiting portion (311) is in limiting fit with the pressing sleeve (222), and the second elastic member (420) is located in the containing cavity (2221) and is connected with the limiting portion (311) and the second valve needle (220).
  13. 13. The electronic expansion valve according to claim 12, wherein a T-shaped bushing (312) is further disposed in the accommodating cavity (2221), a top surface of the bushing (312) is attached to the limiting portion (311), the second elastic member (420) is sleeved on the bushing (312) and located between the bushing (312) and the second valve needle (220), and a maximum distance (h) between a bottom surface of the bushing (312) and the second valve needle (220) is a maximum distance that the valve rod (310) can move relative to the second valve needle (220).
  14. 14. The electronic expansion valve according to claim 12, further comprising a third elastic member (430) located in the valve cavity (101), the other end of the first valve needle (210) being further provided with a second limiting plate (216), the second limiting plate (216) extending radially close to the first valve needle (210), the third elastic member (430) being located between the second limiting plate (216) and the second valve needle (220).
  15. 15. The electronic expansion valve according to claim 1, wherein the driving assembly (300) comprises a valve rod (310), the valve rod (310) can move along the axial direction and is used for pushing and pulling the second valve needle (220) to move along the axial direction, a containing cavity (2221) is formed inside the second valve needle (220), the end of the valve rod (310) facing the second valve needle (220) stretches into the containing cavity (2221) and is provided with a limiting part (311), the limiting part (311) is in limiting fit with a pressing plate at the opening of the containing cavity (2221), and the second valve needle (220) is provided with a second sealing structure (221) in sealing fit with a second valve port.
  16. 16. The electronic expansion valve according to claim 14 or 15, characterized in that the end face of the first valve needle (210) facing the second valve needle (220) is provided with a second groove (2113), the second valve needle (220) being partly accommodated in the second groove (2113), the fluid passage comprises a longitudinal channel (2102) arranged inside the first valve needle (210), the longitudinal channel (2102) extending axially through the first valve needle (210), the longitudinal channel (2102) opening at the bottom of the second groove (2113), wherein a baffle (214) is arranged at the notch of the first valve needle (210) at the second groove (2113), the baffle (214) comprising a first stop (2141) and a second stop (2142) arranged integrally, the first stop (2141) extending radially away from the first valve needle (210) and the second stop (2142) extending radially to the notch of the second groove (2113).
  17. 17. The electronic expansion valve of claim 16, wherein the barrier (214) is connected with the first valve needle (210) via a penetration welding process.
  18. 18. The electronic expansion valve of claim 17, wherein a stepped structure (2143) is provided on a surface of the baffle plate (214) facing away from the first valve needle (210), such that a first stepped surface (21431) located radially on an outer ring and a second stepped surface (21432) located on an inner ring are formed on the surface of the baffle plate (214), the first stepped surface (21431) being axially farther from the first valve needle (210) than the second stepped surface (21432), and the second stepped surface (21432) being opposite to a notch outer edge of the second groove (2113).

Description

Electronic expansion valve Technical Field The disclosure relates to the technical field of valves, and in particular relates to an electronic expansion valve. Background The electronic expansion valve is used as a throttling element for adjusting the on-off state and the flow of the fluid. In the existing design scheme of the electronic expansion valve, the electronic expansion valve comprises a valve seat, an upper valve port and a lower valve port are arranged in a valve cavity in the valve seat, the two valve ports cannot be closed at the same time, and customer requirements are difficult to meet. Therefore, how to realize simultaneous closing of the upper valve port and the lower valve port of the electronic expansion valve has become an important issue to be solved in the related field. Disclosure of Invention It is a primary object of the present disclosure to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide an electronic expansion valve. In order to achieve the above purpose, the present disclosure adopts the following technical scheme: according to one aspect of the present disclosure, there is provided an electronic expansion valve comprising a valve seat assembly, a valve core assembly, and a drive assembly; The valve seat assembly is internally provided with a valve cavity, the valve seat assembly is provided with a first valve port, a first valve hole and a second valve hole which is close to the first valve port compared with the first valve hole, 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 part of the first valve needle is in sealing fit with the first valve port, a fluid passage is arranged in the first valve needle, the fluid passage is provided with a second valve port, one end of the fluid passage is communicated with the first valve hole, the other end of the fluid passage is communicated with the first valve port, the second valve needle is arranged in the valve cavity, the second valve needle is in sealing fit with the second valve hole towards the end part of the first valve port, and the driving assembly is used for driving the first valve needle and the second valve needle to move along the axial direction so as to realize opening and closing control of the first valve port and the second valve port, when the first valve port is closed and the second valve hole is opened, and when the first valve port and the second valve hole are closed, and the first valve hole and the second valve hole are disconnected, and when the first valve port and the first valve hole and the second valve hole are opened, and the first valve hole are disconnected. According to one embodiment of the disclosure, the fluid passage comprises a transverse passage, a longitudinal passage and a valve port passage which are arranged in a first valve needle, the second valve port is arranged in the valve port passage, at least one end of the transverse passage is opened on the side face of the first valve needle, the longitudinal passage axially penetrates through the first valve needle, the valve port passage is communicated with the end part, opposite to the first valve port, of the first valve needle, the end part, opposite to the first valve port, of the first valve needle is communicated with the first valve port through the longitudinal passage, the first valve needle comprises a body part and an extension part, the body part is arranged in the valve cavity, the transverse passage and the valve port passage are arranged, one end part of the extension part is connected with the body part, the other end part is provided with a sealing structure, and when the first valve port is closed, the sealing structure is sealed with the first valve port, the body part is provided with a first sub-passage axially penetrating through, and the extension part is provided with a second sub-passage axially penetrating through, and the body part is communicated with the second sub-passage. According to one embodiment of the present disclosure, the valve port channel does not extend through the body portion. According to one embodiment of the present disclosure, the outer wall surface of the extension portion is provided with an annular groove, and the groove depth of the portion of the groove axially located at both ends is smaller than the groove depth of the middle portion of the groove. According to one embodiment of the invention, the body part is provided with at least two first sub-channels, the end part, close to the body part, of the second sub-channel is provided with an open structure, the inner diameter of the open structure is larger than that of the second sub-channel, and the second sub-channel is simultaneously communicated with at least two first sub-channels through the open structure. According to one embodiment of the disclosure, a first groove is formed in the end face, f