Electronic expansion valve

Abstract

An electronic expansion valve comprises a valve core screw rod assembly, the valve core screw rod assembly comprises a valve core, a gasket part, a first spring and a screw rod assembly; the screw rod assembly comprises a lower stop part, a support part and an upper stop part, the lower stop part can abut against the gasket part, further comprising a first abutting part, the first abutting part can abut against the gasket part, the relative position between the first abutting part and the valve core remains unchanged; further comprising a second abutting part, the support part can abut against the second abutting part, the relative position between the second abutting part and the valve core remains unchanged; the upper stop part abuts against the first spring; when the lower stop part abuts against the gasket part, the distance between the support part and the gasket part is D1, the distance between the support part and the first abutting part is D2, and D1 >= D2; further comprising an elastic part, one end of the elastic part abuts against the screw rod assembly, the other end of the elastic part abuts against the valve core, before the first spring is further compressed, the elastic force of the first spring on the gasket part is greater than the elastic force of the elastic part on the valve core.

Description

[0001] The present application relates to the technical field of refrigeration control, in particular to an electronic expansion valve.

[0002] Figure 1 A valve needle assembly structure of a typical electronic expansion valve is shown, the valve needle assembly of the electronic expansion valve has a screw rod 16', the screw rod 16' is connected with the valve needle 5' through a sleeve 25'; a second gasket 27' is arranged between the valve needle 5' and the sleeve 25'. The sleeve 25' is internally provided with a compression spring 8', 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] The elastic load of the spring 8' is transmitted to the valve needle 5' through the bearing 24', the steel ball 35' and finally the valve needle 5'.

[0004] When the valve needle 5' abuts against the valve port, the elastic load of the spring 8' is transmitted to the valve port through the valve core 5'.

[0005] The present application aims to provide an electronic expansion valve, which comprises a valve core screw rod assembly, the valve core screw rod assembly comprises a valve core, a gasket part, a first spring and a screw rod assembly;

[0006] The screw rod assembly comprises a lower stop part, a support part and an upper stop part, the lower stop part can abut against the gasket part, the valve core screw rod assembly further comprises a first abutting part, the first abutting part can abut against the gasket part, and the relative position between the first abutting part and the valve core remains unchanged;

[0007] The valve core screw rod assembly further comprises a second abutting part, the support part can abut against the second abutting part, and the relative position between the second abutting part and the valve core remains unchanged;

[0008] The upper stop part abuts against the first spring;

[0009] When the lower stop part abuts against the gasket part, the distance between the support part and the gasket part is D1, the distance between the support part and the first abutting part is D2, and D1 is greater than D2;

[0010] The valve core screw rod assembly further comprises an elastic component, one end of the elastic component abuts against the screw rod assembly, and the other end of the elastic component abuts against the valve core; before the first spring is further compressed, the elastic load of the first spring on the gasket part is greater than the elastic load of the second spring on the valve core.

[0011] ​​​The electronic expansion valve provided by the application is characterized in that the valve core is subjected to the elastic load of the second spring and not subjected to the elastic load of the first spring before the first spring is further compressed, and the elastic load of the second spring is smaller than the elastic load of the first spring, so that the friction force of the valve core when the screw rod rotates can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The valve core assembly structure of a typical electronic expansion valve;

[0013] Figure 2 The partial sectional view of the first embodiment of the electronic expansion valve provided by the application in the fully closed state;

[0014] Figure 3 The partial sectional view of the first embodiment of the electronic expansion valve provided by the application in the fully open state;

[0015] Figure 4 The partial sectional view of the first embodiment of the electronic expansion valve provided by the application when the valve core and the valve port sealing part are in contact;

[0016] Figure 5 The partial sectional view of the first embodiment of the electronic expansion valve provided by the application at the critical point when the first spring has not been further compressed;

[0017] Figure 6 The partial sectional view of the first embodiment of the electronic expansion valve provided by the application in the fully closed state;

[0018] Figure 7 The sectional view of the valve core and screw rod assembly of the application; Figure 3

[0019] The exploded view of the valve core and screw rod assembly of the application; Figure 8 Figure 7 The partial sectional view of the second embodiment of the electronic expansion valve provided by the application in the fully open state;

[0020] Figure 9 The partial sectional view of the third embodiment of the electronic expansion valve provided by the application in the fully open state;

[0021] Figure 10 The partial sectional view of the fourth embodiment of the electronic expansion valve provided by the application in the fully open state;

[0022] Figure 11 The partial sectional view of the fifth embodiment of the electronic expansion valve provided by the application in the fully open state;

[0023] Figure 12

[0024] Figure 13 ​​Partial cross-sectional view of the electronic expansion valve according to the sixth embodiment of the present invention in a fully open state;

[0025] Figure 14 Partial cross-sectional view of the electronic expansion valve according to the seventh embodiment of the present invention in a fully open state;

[0026] Figure 15 Partial cross-sectional view of the electronic expansion valve according to the eighth embodiment of the present invention in a fully open state;

[0027] Figure 16 Partial cross-sectional view of the electronic expansion valve according to the ninth embodiment of the present invention in a fully open state;

[0028] Figure 17 Partial cross-sectional view of the electronic expansion valve according to the tenth embodiment of the present invention in a fully open state;

[0029] Figure 18 Partial cross-sectional view of the electronic expansion valve according to the eleventh embodiment of the present invention;

[0030] Figure 19 Partial cross-sectional view of the electronic expansion valve according to the twelfth embodiment of the present invention; Figure 18 Structure diagram of the elastic sheet;

[0031] Figure 20 Partial cross-sectional view of the electronic expansion valve according to the thirteenth embodiment of the present invention;

[0032] Figure 21 Partial cross-sectional view of the electronic expansion valve according to the thirteenth embodiment of the present invention;

[0033] In the above drawings, the following reference numerals are used:

[0034] 1, valve core screw assembly; 11, valve core; 111, valve core sealing part; 112, valve core fitting hole part; 12, abutting part; 121, abutting part; 1211, first abutting part; 1212 second abutting part; 122, peripheral wall part; 13, washer part; 14, first spring; 15, screw assembly; 151, screw; 1511, spring lower groove part; 1512, valve core support groove part; 1513, valve core support flange part; 1514, spring upper annular groove; 153, lower stop part; 1531, lower flange part; 154, support part; 1541, valve core support washer; 155, upper stop part; 1551, upper flange part; 1552, upper stop washer; 156, shaft sleeve part; 1561, hole part; 1562, body part; 1563, engaging part; 157, shaft sleeve washer; 158, protrusion; 16, elastic part; 161, second spring; 162, elastic sheet; 1621, body part; 1622, extension part; 17, steel ball; 20, valve body; 2, valve seat assembly; 21, valve seat; 211, valve port; 2111, valve port sealing part; 212, inner control guide part; 22, first connecting pipe part; 23, second connecting pipe part; 24, guide seat; 241, inner hole guide part; 25, connecting seat; 3, nut assembly; 31, nut; 32, nut connecting part; 33, sliding ring; 4, rotor assembly; 41, rotor magnet; 42, rotor connecting part; 43, rotor stop part; 5, housing; 30, stator coil;

DETAILED DESCRIPTION

[0035] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Please refer to Figures 2 to 8 , wherein Figure 2 is a cross-sectional view of the electronic expansion valve provided by the present application in a fully closed state, Figure 3 is a partial cross-sectional view of the electronic expansion valve provided by the present application in a fully open state, Figure 4 is a partial cross-sectional view of the electronic expansion valve provided by the present application when the valve core and the valve port sealing part are in contact, Figure 5 is a partial cross-sectional view of the electronic expansion valve provided by the present application when the spring is not further compressed at the critical point, Figure 6 is a partial cross-sectional view of the electronic expansion valve provided by the present application in a fully closed state, Figure 7 is Figure 3 is a cross-sectional view of the valve core screw assembly in Figure 8 is Figure 7 is an exploded view of the valve core screw assembly in

[0037] Please refer to Figure 2 ,Figure 2 The electronic expansion valve provided by the present application is composed of a valve body 20 and a stator coil 30. The valve body 20 includes a valve core screw rod 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 a driving controller. After the driving controller is powered on, the stator coil 30 is sent a pulse driving signal, and a periodically changing magnetic field is generated by the stator coil 30, thereby driving the rotor assembly 4 of the electronic expansion valve to rotate forward or reversely. The rotor assembly 4 is fixedly connected to a screw rod 151 of the valve core screw rod assembly 1, and the screw rod 151 is rotated synchronously when the rotor assembly 4 rotates. The screw rod 151 is provided with external threads, and an inner hole part of a nut 31 of the nut assembly 3 is provided with internal threads. The screw rod 151 is threadedly connected to the nut 31. When the rotor assembly 4 rotates, the screw rod 151 moves along the axial direction, thereby driving the valve core screw rod assembly 1 to realize the opening and closing action of a valve port 211.

[0038] The valve seat assembly 2 provided by the present 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. 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 are used as inflow or outflow channels of the fluid medium of the electronic expansion valve, and are generally used for connecting with the system pipeline when the electronic expansion valve is installed in a refrigeration or heating system such as an air conditioner. The valve seat 21 is provided with the valve port 211 at a position close to the center of the second connecting pipe part 23. An upper side edge of the valve port 211 is provided with a valve port sealing part 2111.

[0039] Of course, the first connecting pipe part 22 and the second connecting pipe part 23 can not be provided, and the flow path through which the refrigerant fluid passes can be directly provided on the valve seat. In the present embodiment, the first connecting pipe part 22 and the second connecting pipe part 23 are taken as examples.

[0040] The guide seat 24 of the valve seat assembly 2 is provided with an inner hole guide part 241 at a central inner hole position, which is matched with the outer wall of the valve core screw rod assembly 1 (that is, the inner hole guide part 241 can be matched with the valve core 11 and / or the circumferential wall part 122 of the abutting part 12 of the valve core screw rod assembly 1). When the electronic expansion valve performs the opening and closing action, the inner hole guide part 241 provides a guiding and aligning action for the valve core screw rod assembly 1.

[0041] The upper side of the valve seat assembly 2 is coaxially provided with a nut assembly 3, which includes a nut 31, a nut connecting body 32, a sliding ring 33 and a spiral guide rail 34. The nut 31 can be fixedly connected with the valve seat assembly 3 by welding or the like through the nut connecting body 32. The nut 31 is provided on the outer circle of the upper side with the sliding ring 33 and the spiral guide rail 34, and the sliding ring 33 can rotate spirally within the upper and lower limited stroke range of the spiral guide rail 34. The sliding ring 33 and the spiral guide rail 34 are matched with the rotor assembly 4, and are used to realize the stroke control of the electronic expansion valve between full opening and full closing.

[0042] The rotor assembly 4 includes a rotor magnet 41, a rotor connecting part 42, and a rotor stop part 43 (the rotor stop part 43 can be integrally formed with the rotor magnet 41, and in the present embodiment, a split assembly mode is adopted). The rotor assembly 4 can be fixedly connected (such as by welding) with the screw rod 151 of the valve core screw rod assembly 1 through the rotor connecting part 42, and the rotor assembly 4 is driven to rotate synchronously with the screw rod 151 under the driving of the stator coil 60. The inner side of the rotor assembly 4 is provided with the rotor stop part 43, which is matched with the sliding ring 33 and the spiral guide rail 34 on the nut 31, and is used to limit the rotation of the rotor assembly 4 within a specified stroke range.

[0043] In addition, the electronic expansion valve provided by the present embodiment further includes an open-ended shell 5, which is sleeved outside the rotor assembly 4, and the opening of the shell 5 is welded and sealed with the connecting seat 25 on the upper side of the valve seat assembly 2, thereby forming a closed containing cavity.

[0044] The valve core screw rod assembly 1 mainly includes a valve core 11, an abutting part 12, a gasket part 13, a first spring 14 and a screw rod assembly 15. For details, please refer to Figure 7 and Figure 8 , Figure 7 is a sectional view of the valve core screw rod assembly 1; Figure 8 is an exploded view of the valve core screw rod assembly 1;

[0045] The valve core 11 and the abutting component 12 can be fixedly connected by welding or the like. One end of the valve core 11 includes a valve core sealing portion 111 for cooperating with a valve port sealing portion 2111 to close the valve port 211. The abutting component 12 includes a peripheral wall portion 122 on the outer periphery thereof and an abutting portion 121 integrally formed with the peripheral wall portion 122. The abutting portion 121 includes a first abutting component 1211 at the upper end of the abutting portion 121 and a second abutting component 1212 at the lower end of the abutting portion 121. The relative positions of the first abutting component 1211 and the second abutting component 1212 to the valve core 11 remain unchanged. Of course, the peripheral wall portion 122 and the abutting portion 121 can also be fixedly connected by welding, clamping or the like. The inner diameter of the peripheral wall portion 122 is greater than the inner diameter of the abutting portion 121. The valve core 11 and the abutting component 12 are fixedly connected to form a containing cavity A. Therefore, the valve core 11 and the abutting component 12 define the containing cavity A.

[0046] Of course, when the inner edge of the peripheral wall portion 122 is not circular or the inner edge of the abutting portion 121 is not circular, it can also be understood that the inner edge of the peripheral wall portion 122 is located outside the inner edge of the abutting portion 121 along the normal projection of the plane in which the cross section of the electronic expansion valve is located.

[0047] The gasket portion 13 provided in the embodiment can be in the form of a combination of an open retainer and a gasket. In the embodiment, the gasket portion 13 includes an open retainer and a gasket. Of course, according to the functional principle of the present application, the open retainer of the gasket portion 13 in the embodiment is not limited to the C-shaped open retainer shown in the figure, but can also be replaced by an open retainer of another shape. Similarly, the gasket in the embodiment is not limited to the circular ring-shaped gasket shown in the figure, but can also be replaced by another gasket that has the same function, for example, an open retainer.

[0048] In the present embodiment, when the abutting component 12 fixedly connected to the valve core 11 rotates relative to the screw rod 151, the rotating frictional surface is mainly on the upper and lower surfaces of the open retainer or on the upper and lower surfaces of the gasket. In order to further reduce the frictional resistance of the relative rotation, the surface can be sprayed or plated with a coating layer having a lubricating and wear-resistant function (for example, a coating layer containing polytetrafluoroethylene, or containing graphite, or containing molybdenum disulfide), thereby improving the service life of the electronic expansion valve.

[0049] The screw rod assembly 15 includes a lower stop portion 153 abutting against the gasket portion 13. Specifically, in the present embodiment, the screw rod 151 includes a spring lower recessed groove portion 1511 which is a structure formed by recessing the surface of the screw rod 151. At this time, the screw rod assembly 15 forms a lower flange portion 1531. In the present embodiment, the lower stop portion 153 is the lower flange portion 1531.

[0050] In the spring lower groove part 151, the gasket part 13 is arranged, and the gasket part 13 is limitedly connected with the spring lower groove part 152.

[0051] It is worth noting that the lower flange part 1531 can also be formed in different ways, for example, the lower flange part 1531 can be formed by extending the lower end of the lead screw 151 along the surface thereof, and the lower flange part 1531 can still abut against the gasket part 13.

[0052] In addition, the lead screw assembly 15 further comprises an upper stop part 155, and the upper stop part 155 abuts against the first spring 14. Specifically, in the embodiment, the lead screw assembly 15 comprises an upper flange part 1551, and the upper flange part 1551 extends along the surface of the lead screw 151 in a circumferential direction. The upper flange part 1551 and the lead screw 151 can be formed in an integral manner, or can be fixedly connected by welding or the like. In the embodiment, the upper stop part 155 is the upper flange part 1551.

[0053] In addition, the first spring 14 is sleeved on the lead screw 151. Specifically, one end of the first spring 14 abuts against the upper flange part 1551, and the other end of the first spring 14 abuts against the gasket part 13. Under the action of the first spring 14, the gasket part 13 abuts against the lower flange part 1531. It is worth noting that the one end of the first spring 14 abutting against the upper flange part 1551 includes the one end of the first spring 14 directly abutting against the upper flange part 1551, and also includes the one end of the first spring 14 indirectly abutting against the upper flange part 1551, for example, the first spring 14 and the upper flange part 1551 are directly provided with a check ring or other components.

[0054] Since the gasket part 13 is limitedly connected with the spring lower groove part 152, and under the influence of the first spring 14 on the gasket part 13, the gasket part 13 abuts against the lower flange part 1531.

[0055] The electronic expansion valve provided in the embodiment is characterized in that the first spring 14 is sleeved on the lead screw 151, the upper end of the first spring 14 abuts against the upper stop part 155, and the lower end of the first spring 14 abuts against the lower stop part 153. The first spring 14 cooperates with the lead screw assembly 15, so that the deflection of the first spring 14 can be reduced, the stability of the valve core 11 of the electronic expansion valve during operation can be improved, and the eccentric wear of the valve core 11 can be reduced.

[0056] In addition, the lead screw valve core assembly 1 provided in the embodiment further comprises a supporting part 154, and the supporting part 154 abuts against the abutting part 121. Specifically, in the embodiment, the lead screw assembly 15 comprises a shaft sleeve component 156, and the shaft sleeve component 156 comprises a connecting hole part 1561, a body part 1562, and a clamping part 1563. The connecting hole part 1561 can be a through hole or a blind hole (for example, in the embodiment, the connecting hole part 1561 is a through hole). Figure 20In the shaft sleeve part 156 of the electronic expansion valve shown, the hole part 1561 is in the form of a blind hole, and one end of the screw rod 151 is fixedly connected to the hole part 1561 by welding, interference fit, or the like.

[0057] The engaging part 1563 extends along the circumference of the body part 1562, and at this time, the outer diameter of the engaging part 1563 is greater than the outer diameter of the body part 1562. In this embodiment, the support part 154 is the engaging part 1563, and at this time, the outer diameter of the engaging part 1563 is greater than the inner diameter of the abutting part 121. The engaging part 1563 can support the abutting part 12, thereby supporting the valve needle 11.

[0058] Of course, the outer edge of the engaging part 1563 and the inner edge of the abutting part 121 do not necessarily need to be circular at this time. In the plane in which the cross section of the valve needle screw rod assembly lies, the orthogonal projection of the engaging part 1563 along the plane overlaps the orthogonal projection of the abutting part 121 along the plane, and thus the engaging part 1563 can support the abutting part 12, thereby supporting the valve needle 11.

[0059] In addition, in the case where the valve port 211 is fully open, or the like, the distance D1 between the engaging part 1563 and the first blocking ring 13 is greater than or equal to the distance D2 between the engaging part 1563 and the upper end of the first abutting part 1211 of the abutting part 121, and thus the first blocking ring 13 and the abutting part 121 have an axial distance D1-D2 in the axial direction in the case where the valve port 211 is fully open, or the like.

[0060] The distance D1-D2 can be between 0-0.3 mm.

[0061] At this time, the valve needle 11 can abut against the engaging part 1563 through the abutting part 12. Since the valve needle 11 abuts against the engaging part 1563 through the abutting part 12, and the distance D1 between the engaging part 1563 and the first blocking ring 13 is greater than or equal to the distance D2 between the engaging part 1563 and the upper end of the abutting part 121, at this time, the valve needle 11 is not subjected to the elastic load of the first spring 14.

[0062] In addition, the electronic expansion valve provided in this embodiment further includes an elastic part 16. In this embodiment, the elastic part 16 is a second spring 161. At least part of the second spring 161 is located in the accommodating part A, one end of the second spring 161 abuts against the valve needle 11, the other end of the second spring 161 abuts against the screw rod assembly 15, and the elastic coefficient of the second spring 161 is less than the elastic coefficient of the first spring 14. At this time, the valve needle 11 is subjected to the elastic load of the elastic part 16 / second spring 161.

[0063] For details, please refer to Figure 3 , Figure 3The partial sectional view of the first embodiment of the electronic expansion valve provided by the present application in the full open state, when the electronic expansion valve is in the full open state, the stroke of the valve core 11 from the valve port 211 is L, at this time the valve core screw assembly 1 is at the upper end of its stroke, the first spring 14 is in its initial compression state, the axially slidable washer part 13 provided on the valve core screw assembly 1 abuts against the upper surface of the lower flange part 1531, at this time the valve core 11 is not subjected to the elastic load generated by the first spring 14, the valve core 11 is subjected to the elastic load generated by the second spring 161. The valve core 11 abuts against the clamping part 1563 through the abutting part 12, the lower surface of the washer part 13 abuts against the upper surface of the lower flange part 1531, at this time there is a certain amount of gap D1-D2 between the lower surface of the washer part 13 and the upper surface of the abutting part 121, therefore the valve core 11 is not subjected to the elastic load generated by the first spring 14, at this time the valve core 11 is supported by the clamping part 1563 of the shaft sleeve part 156 due to the effect of the weight and the elasticity of the second spring 161.

[0064] In addition, with the rotation of the rotor assembly 4, the screw rod 151 will displace in the axial direction, and the distance between the valve core sealing part 111 of the valve core 11 and the valve port sealing part 2111 of the valve port 211 will also change.

[0065] Please refer to Figure 4 , Figure 4 The partial sectional view of the first embodiment of the electronic expansion valve provided by the present application when the valve core 11 just contacts the valve port sealing part 2111, at this time the electronic expansion valve is from the full open state to the state that the valve core sealing part 111 just contacts the valve port sealing part 2111, at this time the displacement amount of the downward movement of the valve core 11 is L, during this process the first spring 14 is always in its initial compression state, the washer part 13 provided on the lower stop part 153 of the screw rod 151 always abuts against the lower flange part 1531 of the screw assembly 15, the valve core 11 is also not subjected to the elastic load generated by the first spring 14 in this state, the valve core 11 is subjected to the elastic load of the second spring 161 in this state, at this time the lower surface of the first stop ring 13 and the first abutting part 1211 of the abutting part 12 still maintain a certain amount of gap D1-D2.

[0066] Please refer to Figure 5 , Figure 5 The partial sectional view of the first embodiment of the electronic expansion valve provided by the present application when the first spring 14 has not been further compressed. Compared with the state in Figure 4 , Figure 5The lead screw 151 continued to move downward by a displacement of D1-D2. At this point, the lower surface of the washer portion 13 and the first abutment portion 1211 of the abutment member 12 were just at the critical point of contact. This was equivalent to the first spring 14 being at the critical point of being further compressed, and also equivalent to the valve core 11 and the abutment member 12 being at the critical point of bearing the elastic load of the first spring 14 being further compressed. At this point, the second spring 161 relative to... Figure 4 In this state, the elastic force on the lead screw assembly 15 also increases.

[0067] Please refer to the following for details. Figure 6 , Figure 6 This is a partial cross-sectional view of the electronic expansion valve of the present invention in its fully closed state, according to the first embodiment. Figure 5 Compared to the state in the middle, Figure 6 The lead screw 151 in the valve core assembly moves down by a displacement of α. At this time, the lower surface of the retaining ring 13 is pressed against the abutting part 121 of the abutting member 12, and the first spring 14 is further compressed. The valve core sealing part 111 of the valve core lead screw assembly 1 abuts against the valve port sealing part 2111 of the valve seat member 2. The washer part 13 on the lead screw 151 abuts against the first abutting part 1211 of the abutting member 12. The valve core 11 is loaded by the elastic force generated by the further compressed first spring 14. At this time, the second spring 161 is relative to... Figure 5 In this state, the elastic force on the lead screw assembly 15 can also be increased. At this time, the electronic expansion valve is in the fully closed state, and the lead screw 151 is at the lowest position of its stroke. The downward stroke of the lead screw 151 from the fully open state to this state is L+α.

[0068] Please continue to refer to this. Figures 1-8 In this embodiment, the valve core 11 may also be provided with a valve core mating hole 112. The valve core mating hole 112 is generally a blind hole structure. It is located below the receiving portion A in the axial direction of the valve core 11, and the space in the receiving portion A is in communication with the space in the valve core mating hole 12. A portion of the second spring 161 is located in the receiving portion A, and a portion of the second spring 161 is located in the valve core mating hole 112. The second spring 162 is in clearance fit with the valve core mating hole 112.

[0069] It is worth noting that the electronic expansion valve of this application may also adopt a scheme without setting the valve core mating hole 112. The valve core mating hole 112 is not necessary. It should be understood that the "may" mentioned in this application should not be interpreted as "must".

[0070] By the above arrangement, the length of the second spring 161 can be increased relative to a case where the spool fitting hole portion 112 is not provided, and in addition, by the clearance fit between the second spring 161 and the spool fitting hole portion 112, the spool fitting hole portion 112 can restrict the deflection of the second spring 161 when the second spring 161 is intended to be deflected, and prevent the deflection of the second spring 161 from being too large.

[0071] Of course, the accommodation portion A and the spool fitting hole portion 112 do not necessarily need to have a clear boundary, and in a general sense, the accommodation portion A is a component that generally accommodates the support portion 154, and the spool fitting hole portion 112 is a component that is provided on the basis of the accommodation portion A in order to further accommodate the second spring 161.

[0072] In addition, the electronic expansion valve provided in the present embodiment is also provided with a steel ball 17, which is located in the spool fitting hole portion 112. In the axial direction of the spool 11, the steel ball 17 is located below the second spring 161, and the second spring 161 abuts against the steel ball 17.

[0073] Of course, please refer to Figure 18 The electronic expansion valve provided in the present embodiment can also be provided with a gasket 18, which is located in the spool fitting hole portion 112. In the axial direction of the spool 11, the gasket 18 is located below the second spring, and the second spring abuts against the gasket 18.

[0074] Therefore, the second spring 161 abuts against the spool 11, which includes direct abutment and indirect abutment.

[0075] Because the surface of the steel ball 17 and / or the gasket 18 is relatively smooth, by the above arrangement, the frictional force that the spool 11 receives from the lead screw assembly 15 can be reduced, and the phenomenon that the spool 11 also rotates can be reduced, and thus the phenomenon of wear of the spool 11 caused by the rotation of the spool 11 relative to the valve port 211 is also relatively slight.

[0076] Of course, please refer to Figure 9 In the present embodiment, the lead screw assembly 15 can also include a protruding portion 158, which is located at the lowermost end of the lead screw assembly 15. The protruding portion 158 can be a portion that protrudes below the shaft sleeve component 156 after the lead screw 151 is inserted into the hole portion 1561 of the shaft sleeve component 156, or can be a structure formed by the shaft sleeve component 156 itself (for example Figure 20The valve core screw assembly 1 shown has the following structure: the connecting hole portion 1561 is a blind hole structure. Below the connecting hole portion 1561 of the bushing component 156, there is an axially extending protrusion 158. The area of ​​the protrusion 158 is smaller than that of the support portion 154. Specifically, the orthographic projection of the protrusion 158 along the plane perpendicular to the axial direction of the screw assembly 15 is located within the orthographic projection of the support portion 154 along the plane. At least a portion of the protrusion 158 is located inside the second spring 161. Therefore, when the upper end of the second spring 161 is to produce radial displacement, the protrusion 158 can limit the radial displacement of the second spring 161, making the operation of the valve core 11 more stable.

[0077] With the above configuration, when the valve core 11 moves downward and contacts the valve port 211, the valve core 11 is not subjected to the elastic load of the first spring 14, but is subjected to the elastic load of the second spring 161. Since the elastic load of the first spring 14 is greater than that of the second spring 161, the elastic load on the valve core 11 at the moment of contact with the valve port 211 is smaller in this configuration compared to the case where the valve core 11 is subjected to the elastic load of the first spring 14 at the moment of contact with the valve port 211. This reduces the impact of the valve core 11 on the valve port 211, thereby reducing wear on both the valve core 11 and the valve port 211. This increases the lifespan of the valve core 11 and the valve port 211 of the electronic expansion valve.

[0078] Furthermore, even when the valve core 11 is not in contact with the valve port 211, if the refrigerant impacts the valve core 11, the valve core 11 will be affected by the second spring 161. Compared to the case where the second spring 161 is not provided, the electronic expansion valve of this solution can also reduce the shaking of the valve core 11, making the valve core 11 more stable inside the electronic expansion valve, and at the same time reducing the noise caused by the shaking of the valve core 11.

[0079] Furthermore, before the first spring 14 is further compressed, the valve core 11 is subjected to the elastic load of the second spring 161, but not the elastic load of the first spring 14. The elastic load of the second spring 161 is less than the elastic load of the first spring 14. Therefore, compared to the case where the valve core 11 is always subjected to the elastic load of the first spring 14, the elastic load on the valve needle 11 is smaller before the first spring 14 of the electronic expansion valve in this solution is further compressed, which can reduce the frictional force on the valve needle 11 when the lead screw assembly 15 rotates.

[0080] Please refer to the following for details. Figure 9 , Figure 9 This is a partial cross-sectional view of the electronic expansion valve in the fully open state according to the second embodiment of the present invention.

[0081] In the embodiment, the screw rod assembly 15 comprises a lower stop portion 153 capable of abutting against the gasket portion 13. Specifically, the screw rod assembly 15 comprises a sleeve component 156 comprising a hole portion 1561, a body portion 1562 and a clamping portion 1563. The hole portion 1561 can be a through hole or a blind hole. One end of the screw rod 151 is fixedly connected to the hole portion 1561 by welding, interference fit or the like.

[0082] In the embodiment, the electronic expansion valve comprises a first spring 14 sleeved on the screw rod 151. An upper end of the first spring 14 abuts against the upper stop portion 155 (through the gasket portion 13), and a lower end of the first spring 14 abuts against the lower stop portion 153. The first spring 14 cooperates with the screw rod assembly 15 to reduce the deflection of the first spring 14, thereby reducing eccentric wear.

[0083] The clamping portion 1563 extends along the circumference of the body portion 1562. In this case, the outer diameter of the clamping portion 1563 is greater than the outer diameter of the body portion 1562. In the embodiment, the support portion 154 is the clamping portion 1563. In this case, the outer diameter of the clamping portion 1563 is greater than the inner diameter of the abutting portion 121. Therefore, the clamping portion 1563 can abut against the abutting portion 121 of the abutting component 12.

[0084] In addition, unlike the first embodiment, the lower stop portion 153 is no longer a lower flange portion 1531 in the embodiment. In this case, the lower stop portion 153 is the body portion 1562 of the sleeve component 156. In the embodiment, the body portion 1562 can abut against the gasket portion 13.

[0085] It should be noted that the "can" in the present application refers to a specific state, and does not refer to all working states of the electronic expansion valve. For example, in the embodiment, the body portion 1562 can abut against the gasket portion 13, which refers to the case that the valve port 211 is fully open.

[0086] Of course, in this case, the distance D1 between the clamping portion 1563 and the first stop ring 13 and the distance D2 between the clamping portion 1563 and the upper end of the abutting portion 121 still satisfy D1≥D2.

[0087] The distance D1-D2 can be between 0-0.3mm.

[0088] For details, please refer to Figure 10 , Figure 10 Figure 6 is a partial cross-sectional view of the electronic expansion valve of the third embodiment of the present application in a fully open state.

[0089] In the embodiment, the screw rod assembly 15 comprises a supporting portion 154, and an upper surface of the supporting portion 154 is capable of abutting against the second abutting portion 1212 of the abutting component 12. Specifically, the screw rod assembly 15 comprises a valve core supporting washer 1541, and in addition, the screw rod 151 is provided with a valve core supporting groove portion 1512 and a valve core supporting flange portion 1513. The valve core supporting groove portion 1512 is recessed along the surface of the screw rod 151, and thus the valve core supporting flange portion 1513 below the valve core supporting groove portion 1512 is protruded relative to the circumferential direction of the valve core supporting groove portion 1512. The valve core supporting washer 1541 is assembled to the valve core supporting groove portion 1512, and specifically, the valve core supporting washer 1541 is fixedly connected or limitingly connected to the valve core supporting groove portion 1512.

[0090] At this time, the second spring 161 can abut against the valve core supporting flange portion 1513, and a protrusion 158 can be formed at the approximate center position of the valve core supporting flange portion 1513, and at least part of the protrusion 158 is located inside the second spring 161.

[0091] It is worth noting that the forming mode of the valve core supporting flange portion 1513 can also adopt other forms. For example, the screw rod 151 does not comprise the valve core supporting groove portion 1512, and the valve core supporting flange portion 1513 can be formed by extending along the surface of the lower end of the screw rod 151 in the circumferential direction. At this time, the valve core supporting flange portion 1513 can still abut against the valve core supporting washer 1541.

[0092] The electronic expansion valve provided in the embodiment comprises a first spring 14, and the first spring 14 is sleeved on the screw rod 151. The upper end of the first spring 14 abuts against the upper stop portion 155, and the lower end of the first spring 14 abuts against the lower stop portion 153. The first spring 14 cooperates with the screw rod assembly 15, so that the deflection of the first spring 14 can be relatively reduced, thereby reducing eccentric wear.

[0093] At this time, the supporting portion 154 is a valve core supporting washer 1541, and the upper surface of the valve core supporting washer 1541 is capable of abutting against the second abutting portion 1212 of the abutting component 12. In the case that the valve port 211 is opened, the valve core 11 can be supported on the valve core supporting washer 154 by the abutting component 12 fixedly connected thereto.

[0094] Different from the first embodiment, in the embodiment, the supporting portion 154 is no longer the clamping portion 1563, but is a valve core supporting washer 154. That is, in the embodiment, the abutting portion 121 can abut against the valve core supporting washer 1541.

[0095] It is worth mentioning that the "can" in the present application refers to a specific state, and not to the electronic expansion valve in all states, for example, in the present embodiment, the abutting portion 121 can abut against the valve core support washer 1541, which means that the valve port 211 is fully open.

[0096] Of course, at this time, the distance D1 between the valve core support washer 1541 and the first stop washer 13, and the distance D2 between the valve core support washer 1541 and the upper end of the abutting portion 121 still satisfy D1≥D2.

[0097] In order to further reduce the rotational friction resistance of the abutting portion 121 relative to the lead screw 151, a coating with lubricating and wear-resistant functions (such as a coating containing polytetrafluoroethylene, or containing graphite, or containing molybdenum disulfide) can be sprayed or plated on the surface of the valve core support washer 1541, thereby improving the service life of the electronic expansion valve.

[0098] For details, please refer to Figure 11 , Figure 11 the fourth embodiment of the electronic expansion valve provided by the present application is a partial cross-sectional view in a fully open state;

[0099] In the present embodiment, the lead screw assembly 15 includes an upper stop portion 155, which abuts against the first spring 14. Specifically, in the present embodiment, the lead screw assembly 15 is provided with an upper stop washer 1552, and the lead screw 151 is further provided with a spring upper annular groove 1514 recessed along the surface of the lead screw 151. The upper stop washer 1552 is assembled in the spring upper annular groove 1514, and specifically, the upper stop washer 1552 is fixedly connected or limitingly connected with the spring upper annular groove 1514, that is, it is clamped into the spring upper annular groove 1514 for limiting.

[0100] The electronic expansion valve provided by the present embodiment is characterized in that the first spring 14 is sleeved on the lead screw 151, the upper end of the first spring 14 abuts against the upper stop portion 155, and the lower end of the first spring 14 abuts against the lower stop portion 153. The cooperation of the first spring 14 and the lead screw assembly 15 can relatively reduce the occurrence of deflection of the first spring 14, thereby reducing eccentric wear.

[0101] Unlike the first embodiment, the upper stop portion 155 in the present embodiment is no longer an upper flange portion 1551, but an upper stop washer 1552, that is, in the present embodiment, the upper stop washer 1552 abuts against the first spring 14.

[0102] At this time, the first spring 14 is sleeved on the shaft of the screw rod 151, and the upper end of the first spring 14 abuts against the lower end surface of the upper stop ring 1552. It should be noted that the number of stop rings in the upper stop ring 1552 is not limited in the present application. Specifically, the upper stop ring 1552 arranged on the annular groove 1514 of the spring on the screw rod 151 can be composed of one open stop ring, or one or more stop rings can be additionally arranged below the open stop ring.

[0103] Of course, the distance between the clamping portion 1563 and the lower flange portion 1531 is D1, and the distance between the clamping portion 1563 and the upper end of the abutting portion 121 is D2, and D1≥D2 is still satisfied.

[0104] In the present embodiment, when the valve core 11 and the screw rod 151 rotate relative to each other, the rotating friction surface can also occur between the upper end of the first spring 14 and the upper stop ring 1552. In order to further reduce the friction resistance of the relative rotation, a coating layer with lubricating and wear-resistant functions (for example, a coating layer containing polytetrafluoroethylene, or containing graphite, or containing molybdenum disulfide) can be sprayed or plated on the surface of the upper stop ring 1552, thereby improving the service life of the electronic expansion valve.

[0105] Please refer to Figure 12 , Figure 12 the partial cross-sectional view of the electronic expansion valve provided by the present application in the fully open state of the sixth embodiment;

[0106] Different from the first embodiment, in the present embodiment, the number of gasket portions 13 is one. It is illustrated in the present embodiment that the number of gaskets in the gasket portion 13 is not limited in the present application.

[0107] The electronic expansion valve provided by the present embodiment is characterized in that the first spring 14 is sleeved on the screw rod 151, the upper end of the first spring 14 abuts against the upper stop portion 155, the lower end of the first spring 14 abuts against the lower stop portion 153, and the first spring 14 cooperates with the screw rod assembly 15 to relatively reduce the occurrence of deflection of the first spring 14, thereby reducing eccentric wear.

[0108] Of course, the distance between the clamping portion 1563 and the gasket portion 13 is D1, and the distance between the clamping portion 1563 and the upper end of the abutting portion 121 is D2, and D1≥D2 is still satisfied.

[0109] Please refer to Figure 13 , Figure 13 the partial cross-sectional view of the electronic expansion valve provided by the present application in the fully open state of the sixth embodiment;

[0110] In the present embodiment, a sleeve washer 157 is added between the sleeve member 156 and the abutment member 22. During a period when the valve element 11 is not subjected to the elastic load generated by the first spring 14, the valve element 11 is suspended from the sleeve washer 157 at the engaging portion 1563 of the sleeve member 156, with a spacing from the abutment member 12.

[0111] At this time, the support portion 154 is the sleeve washer 157, and the upper surface of the sleeve washer 157 can abut against the lower surface of the abutment portion 121 of the abutment member 12.

[0112] The electronic expansion valve provided in the present embodiment has the first spring 14 sleeved on the screw rod 151, and the upper end of the first spring 14 abuts against the upper stop portion 155, and the lower end of the first spring 14 abuts against the lower stop portion 153. The first spring 14 cooperates with the screw rod assembly 15, which can relatively reduce the occurrence of deflection of the first spring 14, thereby reducing eccentric wear.

[0113] It is illustrated in the present embodiment that, in the present application, the upper end of the engaging portion 1542 can abut against the abutment portion 121 of the abutment member 12, which is not limited to direct abutment, but also includes indirect abutment, and other components are the same.

[0114] Of course, at this time, the distance between the sleeve washer 157 and the washer portion 13 is D1, and the distance between the sleeve washer 157 and the upper end of the abutment portion 121 is D2, which still satisfies D1≥D2.

[0115] In order to further reduce the rotational frictional resistance of the abutment portion 121 of the abutment member 12 relative to the screw rod 151, preferably, a coating layer having a lubricating and wear-resistant function (for example, a coating layer containing polytetrafluoroethylene, or containing graphite, or containing molybdenum disulfide) can be sprayed or plated on the surface of the sleeve washer 157, thereby improving the service life of the electronic expansion valve.

[0116] For details, please refer to Figure 14 , Figure 14 Figure 7 is a partial cross-sectional view of the electronic expansion valve provided in the present application in a fully open state according to a seventh embodiment;

[0117] For example, in the present embodiment, the structure of the valve seat assembly 2 is slightly different. The valve seat assembly is assembled and fixedly connected by the valve seat 21, the first pipe portion 22, the second pipe portion 23, and the guide seat 24. In the present embodiment, the nut member 30 is fixedly connected to the upper side of the valve seat assembly 2 (specifically, the upper side of the valve seat 21) by the nut connecting body 32, and the fixed connection mode can preferably adopt a welded fixed connection mode.

[0118] In the present embodiment, the guide seat 24 cooperates with the valve element screw rod assembly 1, and the guide seat 24 has a guiding effect on the valve element screw rod assembly 1.

[0119] The electronic expansion valve provided by the embodiment has the first spring 14 sleeved on the screw rod 151, the upper end of the first spring 14 abuts against the upper stop portion 155, the lower end of the first spring 14 abuts against the lower stop portion 153, and the first spring 14 cooperates with the screw rod assembly 15, so that the deflection of the first spring 14 is reduced, and the eccentric wear is reduced.

[0120] Therefore, the main purpose of the present application is to improve the screw valve core assembly 1 of the electronic expansion valve, and other components of the electronic expansion valve, such as the magnetic rotor assembly, the screw valve core assembly, the nut assembly, the stop device and the like, can adopt common technology, or other electronic expansion valve structures that can achieve the same function.

[0121] See Figure 15 , Figure 15 The eighth embodiment of the electronic expansion valve provided by the present application is a partial cross-sectional view in a fully open state.

[0122] In the embodiment, the valve seat assembly 2 is assembled and fixedly connected by the valve seat 21, the first connecting pipe portion 12 and the second connecting pipe portion 13. The central inner hole of the valve seat 21 of the valve seat assembly 2 is provided with an inner hole guide portion 212 cooperating with the valve core screw rod assembly 1. 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 action for the valve core screw rod assembly 1. Specifically, the inner hole guide portion 212 of the valve seat 21 cooperates with the outer edge of the valve core 11 and / or the circumferential wall portion 122 of the abutting member 12 to provide guidance for the valve core screw rod assembly 1.

[0123] The electronic expansion valve provided by the embodiment has the first spring 14 sleeved on the screw rod 151, the upper end of the first spring 14 abuts against the upper stop portion 155, the lower end of the first spring 14 abuts against the lower stop portion 153, and the first spring 14 cooperates with the screw rod assembly 15, so that the deflection of the first spring 14 is reduced, and the eccentric wear is reduced.

[0124] Please refer to Figure 16 , Figure 16 The ninth embodiment of the electronic expansion valve provided by the present application is a partial cross-sectional view in a fully open state.

[0125] In the embodiment, the valve seat assembly 2 is assembled and fixedly connected by the valve seat 21, the first connecting pipe part 22, the second connecting pipe part 23 and the connecting seat 25, the first connecting pipe part 12 is fixedly connected with the connecting seat 17, and the second connecting pipe part 13 is fixedly connected with the valve seat 16. The inner hole guide part 212 in the embodiment is arranged on the inner hole wall of the upper side of the valve port 211 of the valve seat 21, and the inner hole guide part 212 of the valve seat assembly 2 provides a guiding and correcting action for the valve core screw rod assembly 1. When the electronic expansion valve performs opening and closing actions, the valve core screw rod assembly 1 cooperates with the inner hole guide part 10b of the valve seat part to realize the guiding and correcting action for the valve core part. Specifically, the inner hole guide part 212 of the valve seat 21 cooperates with the outer edge of the valve core 11 and / or the peripheral wall part 122 of the abutting part 12 to provide the guiding for the valve core screw rod assembly 1.

[0126] The electronic expansion valve provided in the embodiment is characterized in that the first spring 14 is sleeved on the screw rod 151, the upper end of the first spring 14 abuts against the upper stop part 155, the lower end of the first spring 14 abuts against the lower stop part 153, and the first spring 14 cooperates with the screw rod assembly 15 to relatively reduce the deflection of the first spring 14, thereby reducing eccentric wear.

[0127] Please refer to Figure 17 , Figure 17 the tenth embodiment of the electronic expansion valve provided in the application in a full opening state;

[0128] The valve core screw rod assembly 1 is characterized in that the structure of the valve core 11 and the abutting part 12 is changed, the valve core includes a stepped part 113, the peripheral wall part 122 of the abutting part 12 is sleeved on the side surface of the stepped part 113 and abuts against the stepped surface of the stepped part 113, the abutting part 121 is an annular protrusion formed by extending inward from the inner wall of the peripheral wall part 122, and compared with the above-mentioned embodiments, the clamping part 1563 is located at the upper end of the shaft sleeve part 156 and is easy to cooperate with the abutting part 121 formed as above. At this time, the valve core 11 and the abutting part 12 can be fixedly connected by welding, pressure connection and the like. At this time, the distance between the clamping part 1563 and the spring washer part 13 is D1, and the distance between the clamping part 1563 and the upper end of the abutting part 121 is D2, and D1≥D2 is still satisfied.

[0129] Please refer to Figures 18-19 , Figure 18 the eleventh embodiment of the electronic expansion valve provided in the application, Figure 19 is Figure 18 a structure diagram of the elastic sheet;

[0130] In the embodiment, the elastic part 16 is an elastic sheet 162, the elastic sheet 162 is located in the accommodating part A, the approximate middle position of the elastic sheet 162 abuts against the screw rod assembly 15, and the approximate edge position of the elastic sheet 162 abuts against the valve core 11.

[0131] Because the elastic coefficient of the elastic sheet 162 is not consistent, the elastic coefficient of the elastic sheet 162 changes with the deformation of the elastic sheet 162, and the elastic coefficient of the elastic component 16 is less than the elastic coefficient of the first spring 14. Here, the elastic coefficient of the elastic sheet 162 refers to the elastic coefficient when the valve core 11 just contacts the valve port 211.

[0132] In the embodiment, the valve core 11 includes a portion with a substantially same inner diameter and a portion with a gradually reduced inner diameter, the substantially middle position of the elastic sheet 162 abuts against the screw rod assembly 15, the substantially edge position of the elastic sheet 162 is located at the junction of the portion with the substantially same inner diameter and the portion with the gradually reduced inner diameter of the valve core, and abuts against the valve core 11.

[0133] Further, the elastic sheet 162 can further include an elastic sheet body portion 1621 and an elastic sheet extension portion 1622, the elastic sheet extension portion 1622 is substantially formed by extending radially from the elastic sheet body portion 1621, the number of the elastic sheet extension portion 1622 is more than three, the elastic sheet extension portion 1622 abuts against the valve core 11, and by setting the number, width, size, material, thickness and other parameters of the elastic sheet extension portion 1622, the elastic coefficient of the elastic sheet 162 can be changed, so that the elastic force load of the gasket portion 13 by the first spring 14 is greater than the elastic force load of the valve core 11 by the elastic sheet 162 before the first spring 14 is further compressed.

[0134] Please refer to Figure 20 , Figure 20 the partial cross-sectional view of the twelfth embodiment of the electronic expansion valve provided by the application;

[0135] In the embodiment, the first spring 161 adopts the form of a conical spring, the conical spring can better utilize the space in the accommodating cavity A, and has a better abutting effect.

[0136] Please refer to Figure 21 , Figure 21 the partial cross-sectional view of the thirteenth embodiment of the electronic expansion valve provided by the application;

[0137] In the embodiment, the circumferential wall portion 122 is relatively long, and the height of the circumferential wall portion 122 in the axial direction is higher than the height of the gasket portion 123. When the gasket portion 13 is displaced in the axial direction, the circumferential wall portion 122 can guide the gasket portion 13, and in addition, the outer wall of the circumferential wall portion 122 can also guide the axial displacement of the valve core screw rod assembly 1, so that the axis of the valve core screw rod assembly 1 and the axis of the valve port 211 have good coaxiality.

[0138] In addition, the first abutting portion 1211 and the second abutting portion 1212 described in the present application do not necessarily have to be formed in the same component, for example, the first abutting portion 1211 is formed in component A, and the second abutting portion 1212 is formed in component B, and component A and component B are respectively fixedly connected with the valve core 11. In addition, component A can be fixedly connected with the valve core 11 in a manner of welding, pressure connection (for example, a hole is opened in the side wall of the valve core 11, and component A is pressed into the hole in an interference manner) and the like, as long as the relative position between the first abutting portion 1211 and the valve core 11 remains unchanged, and the second abutting portion 1212 is the same.

[0139] It should be noted that the above, below, left, right and other directional terms mentioned in the present embodiment are all based on the drawings of the specification as the reference, which are introduced for the convenience of description; and the ordinal terms of "first", "second" and the like in the component names are also introduced for the convenience of description, and do not mean any limitation on the order of the components.

[0140] The electronic expansion valve provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in the present text, and the description of the above examples is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0141] The electronic expansion valve provided by the present application is described in detail above. The principles and implementation modes of the present application are described by applying specific examples in the present text, and the description of the above examples is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electronic expansion valve, characterized in that, It includes a valve core screw assembly (1), which includes a valve core (11), a washer portion (13), a first spring (14), and a screw assembly (15); The lead screw assembly (15) includes a lower stop (153), a support (154), and an upper stop (155). The lower stop (153) can abut against the washer (13). The valve core lead screw assembly (1) also includes a first abutting part (1211). The first abutting part (1211) can abut against the washer (13). The relative position of the first abutting part (1211) and the valve core (11) remains unchanged. The valve core screw assembly (1) further includes a second abutment portion (1212), and the support portion (154) is able to abut against the second abutment portion (1212), and the relative position of the second abutment portion (1212) and the valve core (11) remains unchanged; The upper stop (155) abuts against the first spring (14); When the lower stop (153) abuts against the washer (13), the distance between the support (154) and the washer (13) is D1, the distance between the support (154) and the first abutting part is D2, and D1≥D2; The valve core screw assembly (1) further includes an elastic component (16), one end of which abuts against the screw assembly (15), and the other end of which abuts against the valve core (11). Before the first spring (14) is further compressed, the elastic load on the washer portion (13) from the first spring (14) is greater than the elastic load on the valve core (11) from the elastic component (16).

2. The electronic expansion valve according to claim 1, characterized in that, The elastic component (16) is a second spring (161).

3. The electronic expansion valve according to claim 2, characterized in that, The valve core (11) includes a valve core mating hole (112), which is located below the receiving portion (A) in the axial direction of the valve core (11). The space inside the receiving portion (A) communicates with the space inside the valve core mating hole (12). A portion of the second spring (161) is located in the receiving portion (A), and a portion of the second spring (161) is located in the valve core mating hole (112). The second spring (161) is in clearance fit with the valve core mating hole (112).

4. The electronic expansion valve according to claim 3, characterized in that, It also includes a steel ball (17), which is located inside the valve core mating hole (112), and the second spring (161) abuts against the steel ball (17); And / or, it also includes a gasket (18) located within the valve core mating hole (112), and the second spring (161) abuts against the gasket (18).

5. The electronic expansion valve according to claim 1, characterized in that, The elastic component (16) is an elastic sheet (162), which is located in the receiving part (A). The approximately middle position of the elastic sheet (162) abuts against the lead screw assembly (15), and the approximately edge position of the elastic sheet (162) abuts against the valve core (11).

6. The electronic expansion valve according to claim 5, characterized in that, The elastic sheet (162) includes a body portion (1621) and an extension portion (1622). The extension portion (1622) is generally formed by extending radially along the body portion (1621). The number of extension portions (1622) is three or more. The extension portion (1622) abuts against the valve core (11).

7. The electronic expansion valve according to any one of claims 1-6, characterized in that, The lead screw assembly (15) further includes a protrusion (158) located at the lowest end of the lead screw assembly (15); When the elastic component (16) is a second spring 161, the orthographic projection of the protrusion (158) along a plane perpendicular to the axial direction of the lead screw assembly (15) is located within the orthographic projection of the support portion (154) along the plane, and at least a portion of the protrusion (158) is located inside the second spring (161); or, when the elastic component (16) is an elastic sheet (162), the protrusion (158) abuts against the elastic sheet (162).

8. The electronic expansion valve according to any one of claims 1-6, characterized in that, The valve core screw assembly (1) further includes an abutment component (12), which includes an abutment portion (121), the abutment portion (121) including a first abutment portion (1211) and a second abutment portion (1212). The abutment component (12) is fixedly connected to the valve core (11) so that the relative positions of the first abutment portion (1211), the second abutment portion (1212) and the valve core (11) remain unchanged.

9. The electronic expansion valve according to claim 8, characterized in that, The abutting component (12) further includes a peripheral wall portion (122), which is integrally formed with the abutting portion (121) or is fixedly connected. The orthographic projection of the inner edge of the peripheral wall portion (122) along the plane containing the cross-section of the electronic expansion valve is located outside the orthographic projection of the inner edge of the abutting portion (121) along the plane.

10. The electronic expansion valve according to any one of claims 1-6, characterized in that, The lower stop (153) includes a lower flange (1531) that extends circumferentially along the lead screw (151). The lower flange (1531) is integrally formed or fixedly connected to the lead screw (151), and the lower flange (1531) can abut against the washer (13).

11. The electronic expansion valve according to any one of claims 1-6, characterized in that, The lead screw assembly (15) includes a bushing component (156), which includes a receiving hole (1561) for inserting the lead screw (151), a body (1562), and a locking part (1563). The lower stop part (153) is the body part (1562), and the body part (1562) can abut against the washer part (13). The valve core lead screw assembly (1) also includes an abutting part (12).

12. The electronic expansion valve according to claim 11, characterized in that, The engaging portion (1563) extends circumferentially along the body portion (1562), the supporting portion (154) is the engaging portion (1563), and the engaging portion (1563) and the mating portion (121) of the abutting member (12) can directly or indirectly abut against each other.

13. The electronic expansion valve according to claim 11, characterized in that, The engaging portion (1563) extends circumferentially along the body portion (1562). The lead screw assembly (15) also includes a bushing washer (157), which is supported on the engaging portion (1563). The supporting portion (154) is the bushing washer (157). The bushing washer (157) can abut against the mating portion (121) of the abutting member (12). The engaging portion (1563) and the mating portion (121) of the abutting member (12) can indirectly abut against each other.

14. The electronic expansion valve according to any one of claims 1-6, characterized in that, The valve core screw assembly (1) further includes an abutment component (12), the support portion (154) includes a valve core support washer (1541), the screw (151) includes a valve core support groove portion (1512) and a valve core support flange portion (1513), the valve core support washer (1541) is fixedly connected or limitedly connected to the valve core support groove portion (1512), and the valve core support washer (1541) can abut against the mating portion (121) of the abutment component (12).

15. The electronic expansion valve according to any one of claims 1-6, characterized in that, The upper stop (155) includes an upper flange (1551) that extends circumferentially along the lead screw (151). The upper flange (1551) is integrally formed or fixedly connected to the lead screw (151), and the upper flange (1551) abuts against the first spring (14).

16. The electronic expansion valve according to any one of claims 1-6, characterized in that, The upper stop (155) includes an upper retaining ring (1552), and the lead screw (151) includes an annular groove (159) on the spring. The annular groove (159) on the spring is limited or fixedly connected to the upper retaining ring (1552), and the upper retaining ring (1552) abuts against the spring (14).

17. The electronic expansion valve according to any one of claims 1-6, characterized in that, The surface of the gasket portion (13) includes a coating comprising polytetrafluoroethylene, graphite, or molybdenum disulfide.

18. The electronic expansion valve according to any one of claims 1-6, characterized in that, 0≤D1-D2≤0.3mm.

Images