An electronic expansion valve

Abstract

An electronic expansion valve comprises a valve needle screw assembly (1), wherein the valve needle screw assembly (1) comprises a gasket portion (13), a spring (14) and a screw assembly (15), wherein the screw assembly (15) comprises a screw (151), wherein the spring (14) is sleeved on the screw (151); the screw assembly (15) comprises a lower stop portion (153) and an upper stop portion (155), wherein the lower stop portion (153) comprises a lower flange portion (1531) or a main body portion (1562), and the lower stop portion (153) or the main body portion (1562) can abut against the gasket portion (13). The upper stopper (155) includes an upper flange (1551) and / or an upper stopper (1552), and the upper flange (1551) and / or the upper stopper (1552) abut against the spring (14); the lower end of the spring (14) abuts against the washer (13). In the electronic expansion valve, the spring (14) is sheathed on the screw rod (151), and the upper end of the spring (14) abuts against the upper stopper (155), and the lower end of the spring (14) abuts against the lower stopper (153). The spring (14) cooperates with the screw rod assembly (15), and the spring (14) of the valve needle screw rod assembly (1) is not easy to deflect.

Description

[Technical field]

[0001] The invention relates to the technical field of refrigeration control, and in particular to an electronic expansion valve. [Background technology]

[0002] Figure 1 The figure shows a typical valve needle assembly structure of an electronic expansion valve, which has a screw rod 16', which is connected to the valve needle 5' by a sleeve 25' in a floating manner; a gasket 27' is provided between the valve needle 5' and the sleeve 25'. A compression spring 8' is installed in the sleeve 25', the upper end of the compression spring 8' abuts against the bushing at the lower end of the screw rod 16', and the lower end surface of the spring 8' abuts against the bearing 24'.

[0003] Those skilled in the art may provide another valve needle screw assembly whose spring is not easily deflected. [Summary of the invention]

[0004] The object of the present invention is to provide an electronic expansion valve, the spring of the valve needle screw assembly of which is not easily deflected.

[0005] To achieve the above object, the following technical solution is adopted: an electronic expansion valve, characterized in that it includes a valve needle screw assembly, the valve needle screw assembly includes a washer portion, a spring and a screw assembly, the screw assembly includes a screw, and the spring is sleeved on the screw;

[0006] The screw assembly includes a lower stopper and an upper stopper, wherein the lower stopper includes a lower flange portion or a main body portion, and the lower stopper or the main body portion can abut against the washer portion.

[0007] The upper stopper comprises an upper flange portion and / or an upper retaining ring, and the upper flange portion and / or the upper retaining ring abut against the spring;

[0008] The lower end of the spring abuts against the washer portion.

[0009] The electronic expansion valve provided by the present invention has a spring sleeved on the screw rod, and the upper end of the spring abuts against the upper stopper, and the lower end of the spring abuts against the lower stopper. The spring cooperates with the screw rod assembly, and the spring of the valve needle screw rod assembly is not easily deflected.

Brief Description of the Drawings

[0010] Figure 1 It is a typical valve needle assembly structure of an electronic expansion valve;

[0011] Figure 2 A cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state;

[0012] Figure 3A partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0013] Figure 4 A partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing portion just come into contact;

[0014] Figure 5 A partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the spring has not yet reached a critical point of being further compressed;

[0015] Figure 6 A partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state;

[0016] Figure 7 for Figure 2 A cross-sectional view of the middle valve needle screw assembly;

[0017] Figure 8 for Figure 7 Exploded view of the middle valve needle screw assembly;

[0018] Fig. 9 A partial cross-sectional view of the second embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0019] Fig.10 A partial cross-sectional view of the third embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0020] Fig.11 A partial cross-sectional view of a fourth embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0021] Fig.12 A partial cross-sectional view of the fifth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0022] Fig.13 A partial cross-sectional view of the sixth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0023] Fig.14 A partial cross-sectional view of the seventh embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0024] Fig.15 A partial cross-sectional view of the eighth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0025] Fig.16 A partial cross-sectional view of the ninth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0026] The above drawings include the following reference numerals:

[0027] 1. Valve needle screw rod assembly; 11. Valve needle; 111. Valve needle sealing part; 12. Valve needle sleeve; 121. Matching part; 122. Peripheral wall part; 13. Gasket part; 14. Spring; 15. Screw rod assembly; 151. Screw rod; 1511. Spring lower groove part; 1512. Valve needle support groove part; 1513. Valve needle support flange part; 1514. Spring upper annular groove Spring upper annular groove; 153. Lower stopper; 1531. Lower flange part; 154. Valve needle support part; 1541. Valve needle support washer; 155. Upper stopper; 1551. Upper flange part; 1552. Upper retainer ring; 1 56, sleeve component; 1561, structural hole portion; 1562, body portion; 1563, suspension clamping portion; 20, valve body; 2, valve seat assembly; 21, valve seat; 211, valve port; 2111, valve port sealing portion; 212, internal control guide portion; 22, first connecting portion; 23, second connecting portion; 24, guide seat; 241, inner hole guide portion; 25, connecting seat; 3, nut assembly; 31, nut; 32, nut connecting portion; 33, sliding ring; 4, rotor assembly; 41, rotor magnet; 42, rotor connecting portion; 43, rotor stopper; 5, housing; 30, stator coil; [Specific implementation method]

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Please refer to Figures 2 to 8 ,in, Figure 2 This is a cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state. Figure 3 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state. Figure 4 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing portion just come into contact. Figure 5 A partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the spring has not yet been further compressed to a critical point, Figure 6 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state. Figure 7 for Figure 2 Cross-sectional view of the middle valve needle screw assembly, Figure 8 for Figure 7 Exploded view of the middle valve needle screw assembly.

[0030] Please refer to Figure 2 , Figure 2The cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in the fully closed state, in a specific embodiment, the electronic expansion valve provided by the present invention includes a valve body 20 and a stator coil 30. The valve body 20 includes a valve needle screw assembly 1, a valve seat assembly 2, a nut assembly 3, a rotor assembly 4 and a housing 5. The stator coil 30 of the electronic expansion valve is connected to the drive controller. After the drive controller is powered on, a pulse drive signal is sent to the stator coil 30, and the stator coil 30 generates a periodically changing magnetic field, thereby driving the rotor assembly 4 of the electronic expansion valve to rotate forward or reverse. The rotor assembly 4 is fixedly connected to the screw 151 of the valve needle screw assembly 1, and the rotor assembly 4 will synchronously drive the screw 151 to rotate when rotating. The screw 151 of the valve needle screw assembly 1 is provided with an external thread, and the inner hole of the nut 31 of the nut assembly 3 is provided with an internal thread. The screw 151 and the nut 31 are threadedly matched. When the rotor assembly 4 rotates, the screw 151 will move along the axial direction, thereby driving the valve needle screw assembly 1 to approach or move away from the valve port 211.

[0031] Please refer to Figure 2 The valve seat assembly 2 provided in this embodiment includes a valve seat 21, a first connecting pipe part 22, a second connecting pipe part 23, a guide seat 24 and a connecting seat 25, and the first connecting pipe part 22, the second connecting pipe part 23, the guide seat 24 and the connecting seat 25 are fixedly assembled with the valve seat 21. The first connecting pipe part 22 and the second connecting pipe part 23 serve as inflow or outflow channels for the fluid medium of the electronic expansion valve, and are generally used to connect with the system pipeline when it is installed in a refrigeration or heating system such as an air conditioner. The valve seat 21 is provided with a valve port 211 at a position close to the center of the second connecting pipe part 23, and a valve port sealing part 2111 is provided at the upper edge of the valve port 211.

[0032] An inner hole guide portion 241 matching the outer wall of the valve needle screw assembly is provided at the central inner hole position of the guide seat 24 of the valve seat assembly 2. When the electronic expansion valve is opened and closed, the inner hole guide portion 241 provides guidance and correction for the valve needle screw assembly.

[0033] On the upper side of the valve seat assembly 2, a nut assembly 3 is coaxially arranged, and the nut assembly 3 includes a nut 31, a nut connector 32, a sliding ring 33 and a spiral guide 34. The nut 31 can be fixedly connected to the valve seat assembly 3 by welding or other methods through the nut connector 32. On the outer edge of the upper side of the nut 31, a sliding ring 33 and a spiral guide 34 are arranged. The sliding ring 33 can spirally rotate along the spiral guide 34 within the upper and lower limited stroke ranges. The above-mentioned sliding ring 33 and spiral guide 34 cooperate with the rotor assembly 4 to realize the stroke control of the electronic expansion valve from fully open to fully closed.

[0034] Please refer to Figure 2The rotor assembly 4 includes a rotor magnet 41, a rotor connection portion 42, and a rotor stopper 43 (the rotor stopper 43 and the rotor magnet 41 can be integrally formed, and in this embodiment, a separate assembly method is adopted). The rotor assembly 4 can be fixedly connected to the screw 151 of the valve needle screw assembly 1 through the rotor connection body 42 (for example, a welding connection can be adopted). The rotor assembly 4 drives the screw 151 to rotate synchronously under the drive of the stator coil 60. A rotor stopper 43 is provided on the inner side of the rotor assembly 4. The rotor stopper 43 cooperates with the sliding ring 33 and the spiral guide rail 34 on the nut 31 to limit the rotation of the rotor assembly 4 within a specified stroke range.

[0035] In addition, the electronic expansion valve provided in this embodiment further comprises a housing 5 with an opening at one end, which is sleeved on the outside of the rotor assembly 4, and the opening of the housing 5 is welded and sealed to the connecting seat 25 on the upper side of the valve seat assembly 2 to form a closed accommodating cavity.

[0036] The valve needle screw assembly 1 mainly includes a valve needle 11, a valve needle sleeve 12, a gasket 13, a spring 14 and a screw assembly 15. For details, please refer to Figure 7 and Figure 8 , Figure 7 It is a cross-sectional view of the valve needle screw assembly; Figure 8 This is an exploded view of the valve needle screw assembly;

[0037] The valve needle 11 and the valve needle sleeve 12 can be fixedly connected by welding or other methods. One end of the valve needle 11 includes a valve needle sealing portion 111, which is used to cooperate with the valve port sealing portion 2111 to close the valve port 211. The valve needle sleeve 12 includes a peripheral wall portion 122 located on its periphery and a matching portion 121 integrally formed with the peripheral wall portion 122. Of course, the peripheral wall portion 122 and the matching portion 121 can also be fixedly connected by welding, clamping or other methods, and the inner diameter of the peripheral wall portion 122 is greater than the inner diameter of the matching portion 121. After the valve needle 11 and the valve needle sleeve 12 are fixedly connected, an accommodating cavity A is formed. Therefore, the valve needle 11 and the valve needle sleeve 12 define the accommodating cavity A.

[0038] The gasket portion 13 provided in the present embodiment can adopt the combination of an open retaining ring and a gasket, that is, in the present embodiment, the gasket portion 13 includes an open retaining ring and a gasket at the same time. Of course, based on the functional principle of the present invention, the open retaining ring of the gasket portion 13 in the present embodiment is not limited to the C-shaped open retaining ring shown in the figure, and can also be replaced by open retaining rings of other shapes; similarly, the gasket in the present embodiment is not limited to the circular ring gasket shown in the figure, and can also be replaced by other retaining rings that can play the same role, for example, it can also be replaced by an open retaining ring.

[0039] In the present embodiment, when the valve needle sleeve 12 fixedly connected to the valve needle 11 rotates relative to the screw rod 151, the rotational friction fitting surfaces are mainly on the upper and lower surfaces of the opening retaining ring, or on the upper and lower surfaces of the gasket. In order to further reduce the friction resistance of its relative rotation, it is preferred to spray or plate a coating with lubricating and wear-resistant functions (for example, a coating containing polytetrafluoroethylene, or graphite, or molybdenum disulfide), thereby increasing the service life of the electronic expansion valve.

[0040] The screw assembly 15 includes a lower stop portion 153, which abuts against the washer portion 13. Specifically, in this embodiment, the screw 151 includes a spring lower groove portion 1511, which is formed by being recessed along the surface of the screw 151. At this time, the screw assembly 15 forms a lower flange portion 1531. In this embodiment, the lower stop portion 153 is the lower flange portion 1531.

[0041] A washer portion 13 is provided in the groove portion 1511 under the spring. At this time, the washer portion 13 is limitedly connected with the groove portion 1511 under the spring.

[0042] It is worth noting that the lower flange portion 1531 can also be formed in a different manner. For example, the screw rod 151 does not include the spring lower groove portion 1511, and the lower flange portion 1531 can be formed by the lower end of the screw rod 151 extending circumferentially along its surface. At this time, the lower flange portion 1531 can still be against the gasket portion 13.

[0043] In addition, the screw assembly 15 also includes an upper stop portion 155, which abuts against the spring 14. Specifically, in the present embodiment, the screw assembly 15 includes an upper flange portion 1551, which extends circumferentially along the surface of the screw 151. The upper flange portion 1551 and the screw 151 can be integrally formed or fixedly connected by welding or the like. In the present embodiment, the upper stop portion 155 is the upper flange portion 1551.

[0044] In addition, the spring 14 is also sleeved on the screw rod 151. Specifically, one end of the spring 14 abuts against the upper flange portion 1551, and the other end of the spring 14 abuts against the washer portion 13. Under the action of the spring 14, the washer portion 13 abuts against the lower flange portion 1531. It is worth noting that the abutment of one end of the spring 14 against the upper flange portion 1551 includes direct abutment of one end of the spring 14 against the upper flange portion 1551, and also includes indirect abutment of one end of the spring 14 against the upper flange portion 1551, for example, a retaining ring or other components are directly provided between the spring 14 and the upper flange portion 1551.

[0045] Since the washer portion 13 is connected to the lower groove portion 152 of the spring in a limiting manner, at this time, due to the influence of the spring 14 on the washer portion 13, the washer portion 13 abuts against the lower flange portion 1531.

[0046] The electronic expansion valve provided in this embodiment has a spring 14 which is sleeved on the screw rod 151, and the upper end of the spring 14 is against the upper stopper 155, and the lower end of the spring 14 can be against the lower stopper 153 through the washer portion 13. The spring 14 cooperates with the screw rod assembly 15 to relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.

[0047] In addition, the screw valve needle assembly 1 provided in this embodiment also includes a valve needle supporting portion 154, and the valve needle supporting portion 154 is against the mating portion 121. Specifically, in this embodiment, the screw assembly 15 includes a shaft sleeve component 156, and the shaft sleeve component 156 includes a connecting hole portion 1561, a main body portion 1562 and a hanging clamping portion 1563. The connecting hole portion 1561 can be a through hole or a blind hole. One end of the screw 151 can be fixedly connected to the connecting hole portion 1561 by welding, interference fit, etc.

[0048] The hanging clamping part 1563 extends along the circumference of the main body 1562. At this time, the outer diameter of the hanging clamping part 1563 is larger than the outer diameter of the main body 1562. In this embodiment, the valve needle support part 154 is the hanging clamping part 1563. At this time, the outer diameter of the hanging clamping part 1563 is larger than the inner diameter of the matching part 121.

[0049] In addition, when the valve port is fully opened, the distance D1 between the hanging engaging portion 1563 and the first retaining ring 13 is greater than or equal to the distance D2 between the hanging engaging portion 1563 and the upper end of the matching portion 121 .

[0050] At this time, the valve needle 11 can be suspended on the suspension clamping part 1563 through the valve needle sleeve 12. Since the valve needle 11 is suspended on the suspension clamping part 1563 through the valve needle sleeve 12, the valve needle 11 is not subjected to the elastic load generated by the spring 14.

[0051] Please refer to Figure 3 , Figure 3 It is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in the fully open state. When the electronic expansion valve is in the fully open state, the distance between the valve needle 11 and the valve port 211 is L. At this time, the valve needle screw assembly 1 is at the uppermost end of its stroke, the spring 14 is in its initial compression state, and the slidable washer portion 13 provided on the valve needle screw assembly 1 abuts against the upper surface of the lower flange portion 1531, and the valve needle 11 is not subjected to the elastic load generated by the spring 14. The valve needle 11 is suspended on the suspension clamping portion 1563 through the valve needle sleeve 12, and the lower surface of the washer portion 13 abuts against the upper surface of the lower flange portion 1531. At this time, there is a certain amount of gap D1-D2 between the lower surface of the washer portion 13 and the upper surface of the matching portion 121, so the valve needle is not subjected to the elastic load generated by the spring 14. At this time, the valve needle 11 is suspended and supported by the suspension clamping portion 1563 of the shaft sleeve component 156.

[0052] In addition, as the rotor assembly 4 rotates, the screw rod 151 will move along the axial direction, and the distance between the valve needle sealing portion 111 of the valve needle 11 and the valve port sealing portion 2111 of the valve port 211 will also change.

[0053] Please refer to Figure 4 , Figure 4 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the valve needle and the valve port sealing part just come into contact. At this time, the electronic expansion valve is in a fully open state, and the valve needle sealing part 111 just comes into contact with the valve port sealing part 2111. At this time, the downward displacement of the valve needle 11 is L. During this process, the spring 11 is always in its initial compression state, and the lower stopper 153 provided on the screw rod 151 always rests on the lower flange part 1531 of the screw rod assembly 15. In this state, the valve needle 11 is not subjected to the elastic load generated by the compression spring 11. At this time, the lower surface of the gasket part 13 and the upper surface of the matching part 121 of the valve needle sleeve 12 still maintain a certain amount of gap D1-D2.

[0054] Please refer to Figure 5 , Figure 5 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention when the spring has not been further compressed to the critical point. Figure 4 Compared with the status in Figure 5 The screw rod 151 continues to move downward by a displacement of D1-D2, at which time the lower surface of the gasket portion 13 and the upper end of the matching portion 121 of the valve needle sleeve 12 are just at the critical point of contact, which is equivalent to the spring 14 being at the critical point to be further compressed, and also equivalent to the valve needle 11 and the valve needle sleeve 12 being at the critical point to withstand the elastic load of the compression spring 14 that is further compressed.

[0055] Please refer to Figure 6 , Figure 6 This is a partial cross-sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully closed state. Figure 5 Compared with the status in Figure 6 The screw rod 151 in the valve stem moves downward by a displacement of α. At this time, the lower surface of the retaining ring portion 13 is already pressed against the matching portion 121 of the valve needle sleeve 12, and the spring 14 is further compressed. The valve needle sealing portion 111 of the valve needle screw assembly 1 is pressed against the valve port sealing portion 2111 of the valve seat component 2. The washer portion 13 provided on the screw rod 151 is pressed against the upper surface of the matching portion 121 of the valve needle sleeve 12, and the valve needle 11 is loaded by the elastic force generated by the further compressed spring 14. At this time, the electronic expansion valve is in a fully closed state, the screw rod 151 is at the lowest position of its stroke, and the downward stroke of the screw rod 151 from the fully open state to the fully closed state is L+α+D1-D2.

[0056] Please refer to Fig. 9 , Fig. 9 A partial cross-sectional view of the second embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0057] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the second embodiment. The differences from the first embodiment are described in detail below.

[0058] In this embodiment, the screw assembly 15 includes a lower stop portion 153, which can be abutted against the washer portion 13. Specifically, the screw assembly 15 includes a sleeve component 156, and the sleeve component 156 includes a connecting hole portion 1561, a main body portion 1562 and a hanging clamping portion 1563. The connecting hole portion 1561 can be a through hole or a blind hole. One end of the screw 151 can be fixedly connected to the connecting hole portion 1561 by welding, interference fit, or the like.

[0059] The electronic expansion valve provided in this embodiment has a spring 14 which is sleeved on the screw rod 151, and the upper end of the spring 14 abuts against the upper stop 155, and the lower end of the spring 14 abuts against the lower stop 153. The spring 14 cooperates with the screw rod assembly 15 to relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.

[0060] The hanging clamping part 1563 extends along the circumference of the main body part 1562. At this time, the outer diameter of the hanging clamping part 1563 is larger than the outer diameter of the main body part 1562. In the present embodiment, the valve needle support part 154 is the hanging clamping part 1563. At this time, the outer diameter of the hanging clamping part 1563 is larger than the inner diameter of the matching part 121. Therefore, the hanging clamping part 1563 can be offset against the matching part 121 of the valve needle sleeve 12.

[0061] In addition, different from the first embodiment, the lower stop portion 153 in this embodiment is no longer the lower flange portion 1531. At this time, the lower stop portion 153 is the main body portion 1562 of the sleeve component 156, that is, in this embodiment, the main body portion 1562 and the gasket portion 13 can be offset.

[0062] It is worth noting that the "can" mentioned in the present invention refers to a specific state, and does not mean that the electronic expansion valve is in all working states. For example, in this embodiment, the main body 1562 can be offset against the gasket part 13, which means that the valve port 211 is fully opened.

[0063] Of course, at this time, the distance D1 between the hanging engaging portion 1563 and the first retaining ring 13 and the distance D2 between the hanging engaging portion 1563 and the upper end of the matching portion 121 still satisfy D1≥D2.

[0064] Please refer to Fig.10 , Fig.10 This is a partial cross-sectional view of the third embodiment of the electronic expansion valve provided by the present invention in a fully open state.

[0065] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment. The description of the components in the first embodiment is also applicable to the third embodiment. The differences from the first embodiment are described in detail below.

[0066] In this embodiment, the screw assembly 15 includes a valve needle support portion 154, and the upper surface of the valve needle support portion 154 can be abutted against the matching portion 121 of the valve needle sleeve 12. Specifically, the screw assembly 15 includes a valve needle support gasket 1541. In addition, a valve needle support groove portion 1512 and a valve needle support flange portion 1513 are also provided on the screw 151. The valve needle support groove portion 1512 is recessed along the surface of the screw 151, so that the valve needle support flange portion 1513 located below the valve needle support groove portion 1512 protrudes circumferentially relative to the valve needle support groove portion 1512, and the valve needle support gasket 1541 is assembled on the valve needle support groove portion 1512. Specifically, the valve needle support gasket 1541 is fixedly connected or limit-connected to the valve needle support groove portion 1512.

[0067] It is worth noting that the valve needle support flange portion 1513 may also be formed in other forms. For example, the valve needle support groove portion 1512 is not provided on the screw rod 151, and the valve needle support flange portion 1513 may be formed by extending circumferentially along the surface of the screw rod 151 near the lower end. At this time, the valve needle support flange portion 1513 may still be against the valve needle support gasket 1541.

[0068] The electronic expansion valve provided in this embodiment has a spring 14 which is sleeved on the screw rod 151, and the upper end of the spring 14 abuts against the upper stop 155, and the lower end of the spring 14 abuts against the lower stop 153. The spring 14 cooperates with the screw rod assembly 15 to relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.

[0069] At this time, the valve needle support part 154 is a valve needle support gasket 1541, and the upper surface of the valve needle support gasket 1541 can be against the matching part 121 of the valve needle sleeve 12. When the valve port 211 is open, the valve needle 11 can be supported on the valve needle support gasket 154 through the valve needle sleeve 12 fixedly connected thereto.

[0070] Different from the first embodiment, in this embodiment, the valve needle support portion 154 is no longer the suspended clamping portion 1563, and the valve needle support portion 154 is a valve needle support gasket 154, that is, in this embodiment, the matching portion 121 and the valve needle support gasket 1541 can offset each other.

[0071] It is worth noting that the "can" mentioned in the present invention refers to a specific state, and does not mean that the electronic expansion valve is in all states. For example, in this embodiment, the matching part 121 and the valve needle support gasket 1541 can offset each other, which means that the valve port 211 is fully open.

[0072] Of course, at this time, the distance D1 between the valve needle supporting washer 1541 and the first retaining ring 13, and the distance D2 between the valve needle supporting washer 1541 and the upper end of the matching portion 121 still satisfy D1≥D2.

[0073] In order to further reduce the rotational friction resistance of the mating part 121 relative to the screw rod 151, a coating with lubricating and wear-resistant functions (for example, a coating containing polytetrafluoroethylene, graphite, or molybdenum disulfide) can be sprayed or plated on the surface of the valve needle support washer 1541, thereby increasing the service life of the electronic expansion valve.

[0074] Please refer to Fig.11 , Fig.11 A partial cross-sectional view of a fourth embodiment of the electronic expansion valve provided by the present invention in a fully open state;

[0075] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment. The description of the components in the first embodiment is also applicable to the fourth embodiment. The differences from the first embodiment are described in detail below.

[0076] In this embodiment, the screw assembly 15 includes an upper stopper 155, which abuts against the spring 14. Specifically, in this embodiment, the screw assembly 15 is equipped with an upper stopper 1552. In addition, the screw 151 is also provided with a spring upper annular groove 1514, which is recessed along the surface of the screw 151. The upper stopper 1552 is assembled in the spring upper annular groove 1514. Specifically, the upper stopper 1552 is fixedly connected or limitedly connected with the spring upper annular groove 1514, that is, it is clamped into the spring upper annular groove 1514 for limiting. The upper flange 1551 and the upper stopper 1552 can also be provided at the same time, and the spring 14 directly abuts against the upper stopper 1552, and the spring 14 indirectly abuts against the upper flange 1551.

[0077] Different from the first embodiment, the upper stopper 155 in this embodiment is no longer the upper flange portion 1551 , but an upper stopper 1552 . That is, in this embodiment, the upper stopper 1552 abuts against the spring 14 .

[0078] At this time, the spring 14 is sleeved on the shaft of the screw rod 151, and the upper end of the spring 14 abuts against the lower end surface of the upper retaining ring 1552. It is worth noting that the present invention does not limit the number of retaining rings in the upper retaining ring 1552. Specifically, the upper retaining ring 1552 provided on the spring upper annular groove 1514 of the screw rod 151 can be composed of an open retaining ring, or one or more retaining rings can be added to the lower side of the open retaining ring and stacked.

[0079] Of course, at this time, the distance between the hanging clamping portion 1563 and the lower flange portion 1531 is D1, and the distance between the hanging clamping portion 1563 and the upper end of the matching portion 121 is D2, which still satisfies D1≥D2.

[0080] In this embodiment, when the valve needle 11 and the screw rod 151 rotate relative to each other, their rotational friction surface may also occur between the upper end of the spring 14 and the upper retaining ring 1552. In order to further reduce the friction resistance of their relative rotation, a coating with lubricating and wear-resistant functions (for example, a coating containing polytetrafluoroethylene, or graphite, or molybdenum disulfide) can be sprayed or plated on the surface of the above-mentioned upper retaining ring 1552, thereby improving the service life of the electronic expansion valve.

[0081] Please refer to Fig.12 , Fig.12 A partial cross-sectional view of the fifth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0082] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the fifth embodiment. The differences from the first embodiment are described in detail below.

[0083] Different from the first embodiment, in this embodiment, the number of the gasket portion 13 is one. This embodiment illustrates that in the present invention, the number of gaskets in the gasket portion 13 is not limited.

[0084] Of course, at this time, the distance between the hanging clamping portion 1563 and the washer portion 13 is D1, and the distance between the hanging clamping portion 1563 and the upper end of the matching portion 121 is D2, which still satisfies D1≥D2.

[0085] Please refer to Fig.13 , Fig.13 A partial cross-sectional view of the sixth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0086] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment. The description of the components in the first embodiment is also applicable to the sixth embodiment. The differences from the first embodiment are described in detail below.

[0087] In this embodiment, a sleeve gasket 157 is added between the sleeve component 156 and the valve needle sleeve 22. When the valve needle 11 is not subjected to the elastic load generated by the spring 14, the valve needle 11 and the valve needle sleeve 12 are suspended on the suspension clamping portion 1563 of the sleeve component 156 with the sleeve gasket 157 between them.

[0088] At this time, the valve needle supporting portion 154 is a shaft sleeve gasket 157 , and the upper surface of the shaft sleeve gasket 157 can abut against the lower surface of the matching portion 121 of the valve needle sleeve 12 .

[0089] This embodiment explains that: in the present invention, the upper end of the suspension engaging portion 1542 can abut against the matching portion 121 of the valve needle sleeve 12, which is not limited to direct abutment between the two, and also includes indirect abutment between the two.

[0090] Of course, at this time, the distance between the shaft sleeve washer 157 and the washer portion 13 is D1, and the distance between the shaft sleeve washer 157 and the upper end of the matching portion 121 is D2, which still satisfies D1≥D2.

[0091] Please refer to Fig.14 , Fig.14 A partial cross-sectional view of the seventh embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0092] It should be pointed out that the purpose of the present invention is mainly to improve the screw valve needle assembly 1 of the electronic expansion valve. For other components of the electronic expansion valve, such as the magnetic rotor assembly, the nut assembly 3, the stop device and other components, universal technology can be used, and other electronic expansion valve structures that can achieve the same function can also be used.

[0093] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the seventh embodiment. The differences from the first embodiment are described in detail below.

[0094] For example, in this embodiment, the structure of the valve seat assembly 2 is slightly different. The valve seat assembly includes a valve seat 21, a first connecting portion 22, a second connecting portion 23, and a guide seat 24. The nut component 30 in this embodiment is fixedly connected to the upper side of the valve seat assembly 2 (specifically, connected to the upper side of the valve seat 21) through a nut connector 32, and the fixed connection method can preferably be a welding fixed connection method.

[0095] In this embodiment, the guide seat 24 cooperates with the valve needle screw assembly 1 , and the guide seat 24 has a guiding effect on the valve needle screw assembly 1 .

[0096] See Fig.15 , Fig.15A partial cross-sectional view of the eighth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0097] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the eighth embodiment. The differences from the first embodiment are described in detail below.

[0098] In this embodiment, the valve seat assembly 2 includes a valve seat 21, a first connecting portion 12, and a second connecting portion 13. An inner hole guide portion 212 that matches the valve needle screw assembly 1 is provided at the central inner hole position of the valve seat 21 of the valve seat assembly 2. When the electronic expansion valve is opened and closed, the inner hole guide portion 212 of the valve seat 21 provides a guiding and correcting function for the valve needle screw assembly 1. Specifically, the inner hole guide portion 212 of the valve seat 21 matches the outer edge of the valve needle 11 and / or the peripheral wall portion 122 of the valve needle sleeve 12 to provide guidance for the valve needle screw assembly 1.

[0099] Please refer to Fig.16 , Fig.16 A partial cross-sectional view of the ninth embodiment of the electronic expansion valve provided by the invention in a fully open state;

[0100] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the ninth embodiment. The differences from the first embodiment are described in detail below.

[0101] In this embodiment, the valve seat assembly 2 includes a valve seat 21, a first connecting portion 22, a second connecting portion 23, and a connecting seat 25. The first connecting portion 22 is fixedly connected to the connecting seat 25, and the second connecting portion 13 is fixedly connected to the valve seat 21. The inner hole guide portion 212 in this embodiment is arranged on the inner hole wall on the upper side of the valve port 211 of the valve seat 21. The inner hole guide portion 212 of the valve seat assembly 2 provides a guiding and correcting function for the valve needle screw assembly 1. When the electronic expansion valve is opened and closed, the valve needle screw assembly 1 cooperates with the inner hole guide portion 212 of the valve seat component to achieve a guiding and correcting function for the valve needle portion. Specifically, the inner hole guide portion 212 of the valve seat 21 cooperates with the outer edge of the valve needle 11 and / or the peripheral wall portion 122 of the valve needle sleeve 12 to provide guidance for the valve needle screw assembly 1.

[0102] The electronic expansion valve provided in this embodiment has a spring 14 which is sleeved on the screw rod 151, and the upper end of the spring 14 abuts against the upper stop 155, and the lower end of the spring 14 abuts against the lower stop 153. The spring 14 cooperates with the screw rod assembly 15 to relatively reduce the deflection of the spring 14, thereby reducing eccentric wear.

[0103] It should be noted that the directional nouns such as up, down, left, and right mentioned in this embodiment are all based on the drawings in the specification and are introduced for the convenience of description; and the ordinal numbers such as "first" and "second" in the names of the components are also introduced for the convenience of description and do not mean any limitation on any order of the components.

[0104] The electronic expansion valve provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The valve needle screw assembly (1) comprises a washer portion (13), a spring (14) and a screw assembly (15), the screw assembly (15) comprises a screw (151), and the spring (14) is sleeved on the screw (151); The screw rod assembly (15) comprises a lower stop portion (153) and an upper stop portion (155), and the lower stop portion (153) can abut against the washer portion (13); The upper stopper (155) abuts against the spring (14); The lower end of the spring (14) abuts against the washer portion (13); The gasket portion (13) comprises an opening retaining ring and a gasket; The valve needle screw assembly (1) further comprises a valve needle (11) and a valve needle sleeve (12); the valve needle (11) and the valve needle sleeve (12) are fixedly connected to form an accommodating chamber A; the valve needle sleeve (12) comprises a peripheral wall portion (122) and a matching portion (121); the gasket portion (13) is located inside the peripheral wall portion (122); the inner diameter of the matching portion (121) is smaller than the inner diameter of the peripheral wall portion (122); the fixedly connected valve needle (11) and valve needle sleeve (12) are limitedly connected to the screw assembly (15); the gasket portion (13) abuts against the upper surface of the matching portion (121) of the valve needle sleeve (12) in a fully closed state; The lower stopper (153) comprises a lower flange portion (1531), the lower flange portion (1531) extending along the circumference of the screw rod (151), the lower stopper (1531) being integrally formed with the screw rod (151) or fixedly connected thereto, and the lower stopper (153) being capable of abutting against the washer portion (13); The screw rod assembly (15) comprises a valve needle support portion (154), and the valve needle support portion (154) comprises a suspension clamping portion (1563), and the suspension clamping portion (1563) can be abutted against the matching portion (121) of the valve needle sleeve (12).

2. The electronic expansion valve according to claim 1, characterized in that: The screw assembly (15) includes a sleeve component (156), the sleeve component includes a connection hole portion (1561) for the screw (151) to be inserted, a main body portion (1562) and a suspension clamping portion (1563), the lower stop portion (153) is the main body portion (1562), the main body portion (1562) can be abutted against the washer portion (13), and the suspension clamping portion (1563) extends along the circumference of the main body portion (1562).

3. The electronic expansion valve according to claim 1, characterized in that: The upper stop portion (155) comprises an upper flange portion (1551), the upper flange portion (1551) extending along the circumference of the screw rod (151), the upper flange portion (1551) being integrally formed with or fixedly connected to the screw rod (151), and the spring (14) abutting against the upper flange portion (1551).

4. The electronic expansion valve according to claim 1, characterized in that: The upper stop portion (155) comprises an upper stop ring (1552), the screw rod (51) comprises an upper annular groove (1514) on the spring, the upper annular groove (1514) on the spring is positionally connected or fixedly connected to the upper stop ring (1552), and the spring (14) abuts against the upper stop ring (1552).

5. The electronic expansion valve according to claim 1, characterized in that: The upper stop portion (155) comprises an upper flange portion (1551) and an upper retaining ring (1552); the upper flange portion (1551) extends along the circumference of the screw rod (151); the upper flange portion (1551) and the screw rod (151) are integrally formed or fixedly connected; the upper retaining ring (1552) is located between the spring (14) and the upper flange portion (1551); the spring (14) directly abuts against the upper retaining ring (1552); and the spring (14) indirectly abuts against the upper flange portion (1551).

6. The electronic expansion valve according to any one of claims 1, 3-5, characterized in that: The screw assembly (15) is replaced by: including a valve needle support portion (154), the valve needle support portion (154) including a valve needle support gasket (1541) and a valve needle support groove portion (1512), the valve needle support gasket (1541) is fixedly connected or limit-connected to the valve needle support groove portion (1512), and the valve needle support gasket (1541) can be abutted against the matching portion (121) of the valve needle sleeve (12).

7. The electronic expansion valve according to claim 2, characterized in that: The screw assembly (15) is replaced by: comprising a valve needle support portion (154), wherein the valve needle support portion (154) comprises a shaft sleeve washer (157), wherein the shaft sleeve washer (157) is supported by the suspension clamping portion (1563), and wherein the shaft sleeve washer (157) is capable of abutting against the matching portion (121) of the valve needle sleeve (12).

8. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The distance between the suspension clamping portion (1563) and the washer portion (13) is D1, the distance between the suspension clamping portion (1563) and the upper end of the matching portion (121) is D2, and D1≥D2.

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