Electronic expansion valve for air conditioners

Abstract

The present invention relates to the technical field of electronic expansion valves, and discloses an electronic expansion valve for air conditioners, wherein the electronic expansion valve for air conditioners comprises a drive box, a stepper motor is used to drive a valve needle assembly to move vertically, a first connecting pipe is detachably connected to a collection bucket at the bottom, the valve needle assembly comprises a lifting shaft, a filter is installed in a movable sleeve, the movable sleeve is limited to move vertically in a conveying bucket, and the connecting port is connected to the first connecting pipe. The electronic expansion valve for air conditioners realizes the isolation of the first connecting pipe from the second connecting pipe, the connection between the first connecting pipe and the second connecting pipe, and the connection between the second square channel and the first square channel by utilizing the vertical movement of the valve needle assembly. The impurities filtered by the connecting port are recovered into the collection bucket by the push of a piston plate, thereby filtering the refrigerant and avoiding clogging of the electronic expansion valve. The operation is simple, and the refrigeration system can be easily cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve for air conditioners. Background Art

[0002] An electronic expansion valve is a control element commonly used in refrigeration and air conditioning systems to regulate the flow and pressure of the refrigerant. A stepper motor, a key component of the electronic expansion valve, drives the needle valve. This valve's opening is adjusted based on pressure and temperature fluctuations in the refrigeration system, thereby controlling the refrigerant flow and pressure to achieve the desired cooling effect.

[0003] When the cooling system is not cleaned regularly, sediment in the old refrigerant gradually accumulates to form impurities. When different refrigerants are mixed, chemical additives may also precipitate to form impurities. When the refrigerant is mixed with impurities, when the liquid is controlled by the electronic expansion valve, the impurities may aggravate the wear of the valve needle of the expansion valve, and may also cause the electronic expansion valve channel to be blocked. The flow of refrigerant is restricted, resulting in a decrease in the cooling effect of the air-conditioning system, affecting the use of air conditioning. Therefore, we have made improvements to this and proposed an electronic expansion valve for air conditioning. Summary of the Invention

[0004] The present invention is proposed in view of the problem that the refrigerant in the above-mentioned existing cooling system contains impurities that affect the electronic expansion valve's delivery of the refrigerant, thereby affecting the use of the air conditioner.

[0005] Therefore, the purpose of the present invention is to provide an electronic expansion valve for air conditioning, which aims to: filter the refrigerant by utilizing the vertical movement of the valve needle assembly, avoid blockage of the electronic expansion valve, simplify the operation, and realize convenient cleaning of the refrigeration system.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: an electronic expansion valve for an air conditioner, comprising a drive box, a drive barrel installed on one side of the drive box, a delivery barrel installed on the bottom end of the drive barrel, a first connecting pipe connected to one side of the delivery barrel, a second connecting pipe connected to the bottom of the delivery barrel, a valve seat installed in the second connecting pipe, a valve needle assembly provided in the drive barrel, a stepping motor installed in the drive box, the stepping motor used to drive the valve needle assembly to move vertically, a second connecting pipe and a first connecting pipe connected to opposite sides of the delivery barrel, a collecting barrel detachably connected to the bottom of the first connecting pipe, a first square channel provided in the delivery barrel, the first square channel being used to connect the first connecting pipe and the second connecting pipe to form an impurity recovery channel, a piston plate with linear limit movement provided in the impurity recovery channel;

[0007] The valve needle assembly includes a lifting shaft, a movable sleeve is concentrically installed on the bottom end of the lifting shaft, a plug sleeve is concentrically installed on the bottom end of the movable sleeve, the plug sleeve is plugged into the valve seat, a second square channel is opened in the movable sleeve, a filter screen is installed in the movable sleeve, the horizontal surface of the filter screen is flush with the bottom horizontal surface of the second square channel, the movable sleeve is limited to vertical movement in the conveying barrel, a connecting port is opened on the side wall of the conveying barrel, and the connecting port is connected to the first connecting pipe.

[0008] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, the width of the second square channel is equal to the diameter of the filter, the width of the second square channel is equal to the width of the first square channel, and the width of the first square channel is smaller than the diameter of the movable sleeve.

[0009] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, the height of the second square channel is not less than the height of the first square channel, and the distance from the top of the second square channel to the bottom of the lifting shaft is not less than the height of the connecting port.

[0010] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, wherein: the height of the piston plate is equal to the height of the first square channel, a push rod is connected to the side of the piston plate away from the first connecting tube, the push rod is movable through to the outside of the second connecting tube, a first spring is provided on the outer sleeve of the push rod, two baffles are symmetrically installed on the side of the first square channel close to the second connecting tube, and the baffles are located on the side of the piston plate away from the first connecting tube.

[0011] As a preferred solution of the electronic expansion valve for air conditioner of the present invention, a valve slot is installed at the center of the valve seat, the socket is plugged into the valve slot, and a plurality of leakage holes are opened in a ring array in the valve seat.

[0012] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, a transmission shaft is movably installed in the drive box, a worm wheel and a gear are externally connected to the transmission shaft, the output shaft of the stepper motor is transmission-connected with a worm, the worm is meshed with the worm wheel, and a gear plate is movably installed at the center position of the drive barrel, and the gear plate is meshed with the gear.

[0013] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, wherein: the bottom of the toothed disc is concentrically connected to a screw sleeve, a limiting ring is concentrically installed on the bottom end of the screw sleeve, a movable seat is assembled on the outside of the screw sleeve, two positioning rods are symmetrically installed on the bottom of the driving barrel, a sliding sleeve is provided on the outer sliding sleeve of the positioning rod, the top of the sliding sleeve is connected to the movable seat, and the toothed disc rotates to drive the movable seat to move vertically.

[0014] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, wherein: a through hole is opened at the bottom of the driving barrel, the inner diameter of the through hole is equal to the outer diameter of the movable sleeve, the outer diameter of the lifting shaft is smaller than the outer diameter of the movable sleeve, the bottom of the sliding sleeve and the lifting shaft are detachably installed, the inner diameter of the screw sleeve is not less than the outer diameter of the movable sleeve, the top of the driving barrel is connected to a limiting ring, the inner diameter of the limiting ring is not less than the outer diameter of the movable sleeve, and a protective cover is detachably connected to the outside of the limiting ring.

[0015] As a preferred solution of the electronic expansion valve for air conditioning described in the present invention, wherein: a protrusion is installed on the top outer wall of the lifting shaft, a locking cavity is opened at the top of the lifting shaft, a disassembly shaft is screwed together with a thread in the locking cavity, the top of the disassembly shaft extends above the lifting shaft, and locking holes are respectively opened at relative positions on the outer wall of the lifting shaft, the locking holes are connected to the locking cavity, a telescopic tube assembly is installed on one side of the sliding sleeve perpendicular to the axial centerline direction of the lifting shaft, a splint is installed on the extending end of the telescopic tube assembly, a pin is connected to the side of the splint close to the lifting shaft, the pin is plugged into the locking hole, and a second spring is provided on the outer sleeve of the telescopic tube assembly.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention utilizes the vertical movement of the valve needle assembly to achieve the transition between the three states of isolation between the first connecting pipe and the second connecting pipe, communication between the first connecting pipe and the second connecting pipe, and communication between the second square channel and the first square channel. The piston plate is pushed to recover impurities filtered from the communication port into the collection barrel, thereby filtering the refrigerant and avoiding clogging of the electronic expansion valve. The operation is simple, and the refrigeration system can be easily cleaned.

[0018] 2. The present invention forms a valve needle assembly by disassembling a locking shaft, a lifting shaft, a movable sleeve and a plug-in sleeve, and utilizes the detachable connection between the lifting shaft and the sliding sleeve to realize the self-locking assembly of the valve needle assembly and the electronic expansion valve. At the same time, it is convenient to disassemble the valve needle assembly as a whole from the expansion valve body, facilitate the regular maintenance and replacement of the valve needle assembly, and improve the convenience of using the electronic expansion valve.

[0019] 3. The present invention can protect the valve needle assembly and prevent theft by providing a protective cover, and can recover impurities by directly rotating the collection barrel, thereby improving the convenience of refrigerant impurity recovery and the usability of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0021] Figure 1 Schematic diagram of the overall structure of the electronic expansion valve for air conditioning of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of the drive box and drive barrel of the electronic expansion valve for air conditioning of the present invention.

[0023] Figure 3 This is a schematic cross-sectional view of the driving barrel of the electronic expansion valve for air conditioning according to the present invention.

[0024] Figure 4 This is a schematic diagram of the connection structure of the bottom of the sleeve of the electronic expansion valve for air conditioning of the present invention.

[0025] Figure 5 This is a schematic structural diagram of the valve needle assembly of the electronic expansion valve for air conditioners of the present invention.

[0026] Figure 6 This is a schematic diagram of the vertical cross-section structure of the delivery barrel of the electronic expansion valve for air conditioning of the present invention when it is in the impurity recovery state.

[0027] Figure 7 This is a schematic cross-sectional structural diagram of the delivery barrel of the electronic expansion valve for air conditioning of the present invention when it is in the magazine recovery state.

[0028] Figure 8 This is a schematic cross-sectional structural diagram of the delivery barrel of the electronic expansion valve for air conditioning according to the present invention when the first connecting pipe and the second connecting pipe are in a connected state.

[0029] Figure 9 The figure is a schematic cross-sectional structural diagram of the second connecting pipe of the electronic expansion valve for air conditioner of the present invention when the socket and the valve slot are plugged in.

[0030] Description of reference numerals:

[0031] 1. Drive box; 11. Stepper motor; 12. Worm; 13. Drive shaft; 14. Worm gear; 15. Gear;

[0032] 2. Drive barrel; 21. Protective cover; 22. Toothed disc; 23. Screw sleeve; 24. Limiting ring; 25. Moving seat; 26. Sliding sleeve; 261. Telescopic tube assembly; 262. Second spring; 263. Clamp; 264. Latch; 27. Positioning rod; 28. Through hole;

[0033] 3. Delivery barrel; 31. Collection barrel; 32. First connecting pipe; 33. Second connecting pipe; 34. Piston plate; 35. Push rod; 36. First spring; 37. First square channel; 38. Connecting port; 39. Stop bar;

[0034] 4. First connecting pipe; 5. Second connecting pipe; 51. Valve seat; 52. Leak hole; 53. Valve slot;

[0035] 6. Valve needle assembly; 61. Locking shaft; 62. Lifting shaft; 63. Locking cavity; 64. Locking hole; 65. Protrusion; 66. Movable sleeve; 67. Second square channel; 68. Filter screen; 69. Insert sleeve. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] Reference Figure 1-9 , which is a first embodiment of the present invention, provides an electronic expansion valve for air conditioning, which includes a drive box 1, a drive barrel 2 is installed on one side of the drive box 1, a delivery barrel 3 is installed at the bottom end of the drive barrel 2, a first connecting pipe 4 is connected to one side of the delivery barrel 3, a second connecting pipe 5 is connected to the bottom of the delivery barrel 3, a valve seat 51 is installed in the second connecting pipe 5, a valve needle assembly 6 is provided in the drive barrel 2, a stepping motor 11 is installed in the drive box 1, and the stepping motor 11 is used to drive the valve needle assembly 6 to move vertically, the opposite sides of the delivery barrel 3 are respectively connected to the second connecting pipe 33 and the first connecting pipe 32, the bottom of the first connecting pipe 32 is detachably connected to the collecting barrel 31, and the collecting barrel 31 is screwed together with the bottom thread of the first connecting pipe 32, and a first square channel 37 is provided in the delivery barrel 3. The first square channel 37 is used to connect the first connecting pipe 32 and the second connecting pipe 33 to form an impurity recovery channel. A piston plate 34 with linear limited movement is provided in the impurity recovery channel. The valve needle assembly 6 includes a lifting shaft 62. A movable sleeve 66 is concentrically installed at the bottom end of the lifting shaft 62. A plug sleeve 69 is concentrically installed at the bottom end of the movable sleeve 66. The plug sleeve 69 is plugged into the valve seat 51. A second square channel 67 is provided in the movable sleeve 66. A filter screen 68 is installed in the movable sleeve 66. The horizontal surface of the filter screen 68 is flush with the bottom horizontal surface of the second square channel 67. Figure 8 and Figure 9 As shown, the filter screen 68 is located at the bottom of the second square channel 67 , the movable sleeve 66 is limited to move vertically in the conveying barrel 3 , and a connecting port 38 is opened on the side wall of the conveying barrel 3 , which is connected to the first connecting pipe 4 .

[0039] Combined with attachment Figure 6-9, the width of the second square channel 67 is equal to the diameter of the filter screen 68, so the width of the second square channel 67 is equal to the inner diameter of the movable sleeve 66, so that the impurities filtered by the upper end surface of the filter screen 68 are gathered at the second square channel 67; the width of the second square channel 67 is equal to the width of the first square channel 37, and the piston plate 34 moves linearly in the first square channel 37, so that when the second square channel 67 moves to the position of the first square channel 37, it converges with the impurity recovery channel. At this time, the piston plate 34 moves linearly, which can push the impurities in the channel to move toward the first connecting pipe 32 and fall and be collected in the collection barrel 31; the width of the first square channel 37 is smaller than the diameter of the movable sleeve 66, and the inner diameter of the conveying barrel 3 is equal to the outer diameter of the movable sleeve 66, so that the movable sleeve 66 can be limited; the height of the second square channel 67 is not less than the height of the first square channel 37 to ensure that the piston plate 34 can move linearly in the magazine recovery channel; the distance from the top of the second square channel 67 to the bottom of the lifting shaft 62 is not less than the height of the connecting port 38, as shown in the attached figure. Figure 9 As shown, the part above the second square channel 67 can block the connecting port 38 to isolate the connection state of the first connecting pipe 4 and the second connecting pipe 5; the height of the piston plate 34 is equal to the height of the first square channel 37, and the side of the piston plate 34 away from the first connecting pipe 32 is connected to the push rod 35, and the push rod 35 is movable through the outside of the second connecting pipe 33. A first spring 36 is provided on the outer sleeve of the push rod 35, and two baffles 39 are symmetrically installed on the side of the first square channel 37 close to the second connecting pipe 33. The baffle 39 is located on the side of the piston plate 34 away from the first connecting pipe 32, and the first spring 36 is used to drive the piston plate 34 to move in the direction of the baffle 39. By manually pushing the push rod 35, the piston plate 34 can be moved linearly in the impurity recovery channel to push the impurity recovery paper collection barrel 31 at the second square channel 67.

[0040] Combined with attachment Figure 2 and Figure 3 A valve groove 53 is installed at the center of the valve seat 51, and the socket 69 is plugged into the valve groove 53. A number of leakage holes 52 are opened in a ring array in the valve seat 51. When the socket 69 is plugged into the valve groove 53, the first connecting pipe 4 and the second connecting pipe 5 are not connected. The leakage holes 52 are set for the flow of refrigerant.

[0041] The operating principle of the electronic expansion valve is as follows: Figure 9 The valve needle assembly 6 is in the initial state. The valve needle assembly 6 is controlled by the stepping motor 11 in the driving box 1 to move vertically upward. Figure 9 Status changes to Figure 8State, at this time the plug sleeve 69 is separated from the valve groove 53, the position of the second square channel 67 moves to be flush with the connecting port 38, the horizontal surface of the filter screen 68 is flush with the horizontal surface of the bottom of the connecting port 38, the refrigerant enters from the first connecting pipe 4, passes through the connecting port 38 and enters the second square channel 67, the top is limited by the lifting shaft 62, the refrigerant is filtered by the filter screen 68 and flows down to the second connecting pipe 5 to flow out, so as to realize the transportation of the refrigerant; when the transportation is stopped, the valve needle assembly 6 can be controlled to reset to the initial state, or impurities can be recovered, by continuing to control the valve needle assembly 6 to move upward, so that the valve needle assembly 6 is Figure 8 Status changes to Figure 6 Status, where Figure 7 for Figure 6 The cross-sectional view of the state shows that in this state, by manually pushing the push rod 35, the piston plate 34 pushes the impurities in the impurity recovery channel to move into the first connecting pipe 32. During the movement, the piston plate 34 passes through the upper surface of the filter screen 68 and the first square channel 37 until it moves above the connection point of the collection barrel 31. The impurities fall into the collection barrel 31 for recovery, and then the valve needle assembly 6 is controlled to reset to the initial state. The valve needle assembly 6 moves downward until the sleeve 69 is against the valve groove 53. At this time, the first connecting pipe 4 and the second connecting pipe 5 are not connected, and the collection barrel 31 can be removed for cleaning, thereby realizing an air-conditioning electronic expansion valve with impurity filtering function.

[0042] Example 2

[0043] Reference Figure 1-5 , which is the second embodiment of the present invention, differs from the first embodiment in that:

[0044] A transmission shaft 13 is movably installed in the drive box 1, and a worm gear 14 and a gear 15 are connected to the outer sleeve of the transmission shaft 13. The output shaft of the stepper motor 11 is connected to the worm 12, and the worm 12 is meshed with the worm gear 14. A toothed disc 22 is movably installed at the center position of the drive barrel 2, and the toothed disc 22 is meshed with the gear 15. The bottom of the toothed disc 22 is concentrically connected to a screw sleeve 23, and a limit ring 24 is concentrically installed at the bottom end of the screw sleeve 23. A moving seat 25 is assembled outside the screw sleeve 23. Two positioning rods 27 are symmetrically installed at the bottom of the drive barrel 2. The outer sliding sleeve of the positioning rod 27 is provided with a sliding sleeve 26. The top of the sliding sleeve 26 is connected to the moving seat 25. The toothed disc 22 rotates to drive the moving seat 25 to move vertically. The driving principle of the stepper motor 11 is: through the movement of the stepper motor 11 The worm 12 rotates in a circular motion, and the worm 12 meshes with the worm wheel 14, so that the transmission shaft 13 rotates, and the gear 15 rotates synchronously with the transmission shaft 13. The tooth diameter of the gear 15 is smaller than the tooth diameter of the toothed disc 22. Each time the gear 15 rotates several circles, the toothed disc 22 rotates one circle. The top of the toothed disc 22 is movably connected to the inner wall of the driving barrel 2 using a bearing sleeve. The rotation of the toothed disc 22 causes the screw sleeve 23 to rotate concentrically, and the moving seat 25 installed outside the screw sleeve 23 is limited by the positioning rod 27, so that the moving seat 25 moves vertically downward on the screw sleeve 23. During the vertical downward movement, the sliding sleeve 26 slides vertically along the positioning rod 27. When the stepping motor 11 rotates in the opposite direction, the screw sleeve 23 rotates in the opposite direction, and the moving seat 25 moves vertically upward.

[0045] Combined with attachment Figure 1 、 Figure 2 、 Figure 3 and Figure 5 A through hole 28 is provided at the bottom of the driving barrel 2, and the inner diameter of the through hole 28 is equal to the outer diameter of the movable sleeve 66, so that the movable sleeve 66 can vertically penetrate the through hole 28, and the outer diameter of the lifting shaft 62 is smaller than the outer diameter of the movable sleeve 66. The bottom of the sliding sleeve 26 and the lifting shaft 62 are detachably installed, and the inner diameter of the screw sleeve 23 is not less than the outer diameter of the movable sleeve 66, so that the movable sleeve 66 can vertically penetrate. The top of the driving barrel 2 is connected to a limiting ring 24, and the inner diameter of the limiting ring 24 is not less than the outer diameter of the movable sleeve 66, so that the movable sleeve 66 can vertically penetrate. A protective cover 21 is detachably connected to the outside of the limiting ring 24. The protective cover 21 is convenient for protecting the valve needle assembly 6 from accidental touch.

[0046] Combined with attachment Figure 1 、 Figure 2 、 Figure 3 and Figure 5, a protrusion 65 is installed on the outer wall of the top end of the lifting shaft 62, and a locking cavity 63 is opened at the top of the lifting shaft 62. The internal thread of the locking cavity 63 is screwed together with the unlocking shaft 61, and the top of the unlocking shaft 61 extends above the lifting shaft 62. Locking holes 64 are respectively opened at relative positions on the outer wall of the lifting shaft 62. The locking holes 64 are connected to the locking cavity 63. On one side of the sliding sleeve 26, a telescopic tube assembly 261 is installed perpendicular to the axial centerline direction of the lifting shaft 62, and a splint 263 is installed on the extending end of the telescopic tube assembly 261. The side of the splint 263 close to the lifting shaft 62 is connected with a latch 264, and the latch 264 is plugged into the locking hole 64. A second spring 262 is provided on the outer sleeve of the telescopic tube assembly 261. The extending section of the latch 264 is a conical structure, and the bottom end of the unlocking shaft 61 is a conical structure.

[0047] The replacement principle of the valve needle assembly 6 of the electronic expansion valve is as follows: when the valve needle assembly 6 is in the state of the delivery barrel 3 as Figure 6 As shown, the state of the lifting shaft 62 in the driving barrel 2 is shown in the conveying barrel 3. In this state, the protective cover 21 can be disassembled, and then the unlocking shaft 61 can be rotated downward so that the bottom end of the unlocking shaft 61 pushes out the pins 264 on both sides, and then the protrusion 65 is pulled upward to pull the lifting shaft 62 out from the limiting ring 24. The movable sleeve 66 passes through the through hole 28, the screw sleeve 23, and is pulled out from the limiting ring 24, so that the entire valve needle assembly 6 is pulled out, which is convenient for regular maintenance and replacement of the valve needle assembly 6. When the new When the valve needle assembly 6 is inserted and installed from the limiting ring 24, the valve needle assembly 6 moves vertically downward, the movable sleeve 66 passes through the through hole 28 and enters the conveying barrel 3, and the locking hole 64 on the side wall of the lifting shaft 62 encounters the pin 264, and the pin 264 is plugged into the locking hole 64 under the drive of the second spring 262. At this time, the disassembly locking shaft 61 is located above the locking hole 64, and the assembly of the valve needle assembly 6 is completed, which can achieve the effect of vertically moving the movable seat 25 downward and vertically moving the lifting shaft 62 downward with the sliding sleeve 26.

[0048] The remaining structures are the same as those of Example 1.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Electronic expansion valve for air conditioner, characterized by: The invention comprises a driving box (1), wherein a driving barrel (2) is installed on one side of the driving box (1), a conveying barrel (3) is installed at the bottom end of the driving barrel (2), a first connecting pipe (4) is connected to one side of the conveying barrel (3), a second connecting pipe (5) is connected to the bottom of the conveying barrel (3), a valve seat (51) is installed in the second connecting pipe (5), a valve needle assembly (6) is provided in the driving barrel (2), a stepping motor (11) is installed in the driving box (1), the stepping motor (11) is used to drive the valve needle assembly (6) to move vertically, a second connecting pipe (33) and a first connecting pipe (32) are connected to opposite sides of the conveying barrel (3), the bottom of the first connecting pipe (32) is detachably connected to a collecting barrel (31), a first square channel (37) is opened in the conveying barrel (3), the first square channel (37) is used to connect the first connecting pipe (32) and the second connecting pipe (33) to form an impurity recovery channel, and a piston plate (34) with linear limit movement is provided in the impurity recovery channel; The valve needle assembly (6) includes a lifting shaft (62), a movable sleeve (66) is concentrically mounted on the bottom end of the lifting shaft (62), a plug sleeve (69) is concentrically mounted on the bottom end of the movable sleeve (66), the plug sleeve (69) is plugged into the valve seat (51), a second square channel (67) is provided in the movable sleeve (66), a filter screen (68) is installed in the movable sleeve (66), the horizontal surface of the filter screen (68) is flush with the bottom horizontal surface of the second square channel (67), the movable sleeve (66) is limited to move vertically in the conveying barrel (3), a connecting port (38) is provided on the side wall of the conveying barrel (3), and the connecting port (38) is connected to the first connecting pipe (4); The width of the second square channel (67) is equal to the diameter of the filter screen (68), the width of the second square channel (67) is equal to the width of the first square channel (37), and the width of the first square channel (37) is smaller than the diameter of the movable sleeve (66); The height of the second square channel (67) is not less than the height of the first square channel (37), and the distance from the top of the second square channel (67) to the bottom of the lifting shaft (62) is not less than the height of the communication port (38); The height of the piston plate (34) is equal to the height of the first square channel (37); A valve groove (53) is installed at the center of the valve seat (51), the insert sleeve (69) is plugged into and matched with the valve groove (53), and a plurality of leakage holes (52) are opened in a circular array in the valve seat (51); The operating principle of the electronic expansion valve for air conditioners is as follows: in the initial state, when the socket (69) is plugged into the valve groove (53), the first connecting pipe (4) and the second connecting pipe (5) are not connected. When the refrigerant is transported, the control valve needle assembly (6) is positioned and moved vertically upward. At this time, the socket (69) is separated from the valve groove (53), and the second square channel (67) is moved to be flush with the connecting port (38). The horizontal surface of the filter screen (68) is flush with the bottom horizontal surface of the connecting port (38). The refrigerant enters from the first connecting pipe (4), passes through the connecting port (38) and enters the second square channel (67). The top is affected by the pressure. When the lifting shaft (62) reaches the limit position, the refrigerant is filtered by the filter (68) and flows out into the second connecting pipe (5) to realize the transportation of the refrigerant; when the transportation is stopped, the impurities are recovered by continuing to control the valve needle assembly (6) to move upward; in this state, the piston plate (34) pushes the impurities in the impurity recovery channel to move into the first connecting pipe (32), and the piston plate (34) passes through the upper surface of the filter (68) and the first square channel (37) during the movement until it moves above the connection point of the collection barrel (31), and the impurities fall into the collection barrel (31) for recovery.

2. The electronic expansion valve for air conditioning according to claim 1, characterized in that: A push rod (35) is connected to the side of the piston plate (34) away from the first connecting pipe (32), and the push rod (35) is movable and extends outside the second connecting pipe (33). A first spring (36) is provided on the outer sleeve of the push rod (35). Two baffles (39) are symmetrically installed on the side of the first square channel (37) close to the second connecting pipe (33). The baffles (39) are located on the side of the piston plate (34) away from the first connecting pipe (32).

3. The electronic expansion valve for air conditioning according to claim 2, characterized in that: A transmission shaft (13) is movably mounted in the drive box (1), a worm wheel (14) and a gear (15) are connected to the outer surface of the transmission shaft (13), an output shaft of the stepping motor (11) is connected to a worm (12), the worm (12) and the worm wheel (14) are meshed together, and a toothed disc (22) is movably mounted at a central position in the drive barrel (2), and the toothed disc (22) is meshed together with the gear (15).

4. The electronic expansion valve for air conditioning according to claim 3, characterized in that: The bottom of the toothed disc (22) is concentrically connected to a screw sleeve (23), the bottom end of the screw sleeve (23) is concentrically mounted with a limit ring (24), the screw sleeve (23) is externally mounted with a movable seat (25), two positioning rods (27) are symmetrically mounted on the bottom of the driving barrel (2), the outer sliding sleeve of the positioning rod (27) is provided with a sliding sleeve (26), the top of the sliding sleeve (26) is connected to the movable seat (25), and the toothed disc (22) rotates to drive the movable seat (25) to move vertically.

5. The electronic expansion valve for air conditioning according to claim 4, characterized in that: A through hole (28) is provided at the bottom of the driving barrel (2), the inner diameter of the through hole (28) is equal to the outer diameter of the movable sleeve (66), the outer diameter of the lifting shaft (62) is smaller than the outer diameter of the movable sleeve (66), the bottom of the sliding sleeve (26) and the lifting shaft (62) are detachably mounted, the inner diameter of the screw sleeve (23) is not smaller than the outer diameter of the movable sleeve (66), the top of the driving barrel (2) is connected to a limiting ring (24), the inner diameter of the limiting ring (24) is not smaller than the outer diameter of the movable sleeve (66), and a protective cover (21) is detachably connected to the outside of the limiting ring (24).

6. The electronic expansion valve for air conditioning according to claim 5, characterized in that: The top outer wall of the lifting shaft (62) is provided with a protrusion (65), the top of the lifting shaft (62) is provided with a locking cavity (63), the internal thread of the locking cavity (63) is screwed and connected with a dismantling shaft (61), the top of the dismantling shaft (61) extends to the top of the lifting shaft (62), and locking holes (64) are respectively provided at relative positions on the outer wall of the lifting shaft (62), the locking holes (64) are connected with the locking cavity (63), one side of the sliding sleeve (26) is provided with a telescopic tube assembly (261) perpendicular to the axis direction of the lifting shaft (62), the extending end of the telescopic tube assembly (261) is provided with a splint (263), the side of the splint (263) close to the lifting shaft (62) is connected with a latch (264), the latch (264) is plugged into the locking hole (64), and the outer sleeve of the telescopic tube assembly (261) is provided with a second spring (262).

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