CN112879573A

CN112879573A - Electronic expansion valve

Info

Publication number: CN112879573A
Application number: CN201911197370.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2021-06-01

Abstract

An electronic expansion valve comprises a valve needle screw rod assembly, wherein the valve needle screw rod assembly comprises a valve needle, a sleeve part, an upper spring, a lower spring, an elastic carrier part and a screw rod part, the screw rod part comprises a screw rod body part and a butting part, the screw rod body part and the butting part are fixedly connected or are in an integral structure, the screw rod part is in limit connection with the sleeve part, the valve needle comprises a large-diameter section and a small-diameter section, the valve needle is in limit connection with the sleeve part, the upper spring, the lower spring and the elastic carrier part are positioned in the sleeve part, the upper end of the upper spring is abutted against the abutting part, the lower end of the upper spring is abutted against the elastic carrier part, the upper end of the lower spring is pressed against the elastic carrier component, the lower end of the lower spring is pressed against the sleeve component, the abrasion of the valve needle and the valve port caused by relative rotation can be reduced conveniently by changing the elasticity of the upper spring and the lower spring to the elastic carrier component in the initial state.

Description

Electronic expansion valve

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve.

[ background of the invention ]

The electronic expansion valve is mainly applied to a refrigeration system, the rotation of a rotor is controlled by an electromagnetic coil, and a valve needle is close to or far away from a valve port through the matching of a screw rod and a nut, so that the flow area of the valve port is adjusted, and the flow of a refrigerant is adjusted.

When the valve needle contacts with the valve port, the downward force applied to the valve needle affects the service life of the electronic expansion valve, and if the downward force applied to the valve needle when the valve needle contacts with the valve port is large, the valve needle is easy to rotate relative to the valve port, so that the valve needle and the valve port are easy to wear due to relative rotation of the valve needle and the valve port.

[ summary of the invention ]

The invention aims to provide an electric valve which can conveniently control the magnitude of spring load when a valve needle is contacted with a valve port.

In order to realize the purpose, the following technical scheme is adopted: an electronic expansion valve comprises a valve needle screw rod assembly, wherein the valve needle screw rod assembly comprises a valve needle, a sleeve part, an upper spring, a lower spring, an elastic carrier part and a screw rod part;

the screw rod component comprises a screw rod body part and an abutting part, the screw rod body part and the abutting part are fixedly connected or are in an integral structure, and the screw rod component is in limit connection with the sleeve part;

the valve needle comprises a large-diameter section and a small-diameter section, the outer diameter of the large-diameter section is larger than that of the small-diameter section, and the valve needle is in limit connection with the sleeve part;

the upper spring, the lower spring and the elastic carrier component are positioned in the sleeve component, the upper end of the upper spring is abutted against the abutting part, the lower end of the upper spring is abutted against the elastic carrier component, the upper end of the lower spring is abutted against the elastic carrier component, and the lower end of the lower spring is abutted against the sleeve component.

The electronic expansion valve provided by the invention is configured into the electronic expansion valve in the state, so that the rotating torque of the valve needle is smaller by conveniently changing the elasticity of the upper spring and the lower spring to the elastic carrier component in the initial state, the valve needle is not easy to rotate relative to the valve port, and the abrasion of the valve needle and the valve port caused by relative rotation is reduced.

[ description of the drawings ]

Fig. 1 is a sectional view of a first embodiment of an electronic expansion valve according to the present invention in a fully closed state;

FIG. 2 is a partial cross-sectional view of a first embodiment of an electronic expansion valve according to the present invention in a fully open state;

FIG. 3 is a partial cross-sectional view of the valve needle of the first embodiment of the electronic expansion valve provided in the present invention just after contact with the valve port seal;

FIG. 4 is a cross-sectional view of the valve needle stem assembly of FIG. 2;

FIG. 5 is an exploded view of the valve needle stem assembly of FIG. 4;

FIG. 6 is a schematic cross-sectional view of an abutment in the valve pin screw assembly;

FIG. 7 is a schematic cross-sectional view of a spring carrier component of the valve pin screw assembly;

fig. 8 is a cross-sectional view of a second embodiment of a valve needle screw assembly of an electronic expansion valve provided in accordance with the present invention;

fig. 9 is a sectional view of a valve needle screw assembly of an electronic expansion valve according to a third embodiment of the present invention.

Wherein the figures include the following reference numerals:

1. a valve needle screw assembly; 11. a valve needle; 111. a large diameter section; 112. a small diameter section; 113. a steel ball accommodating part; 12. a sleeve member; 121. a first cylindrical portion; 1211. a valve needle fitting through hole portion; 122. an upper cover portion of the sleeve; 1221. an upper cover through hole part; 123. a second cylindrical portion; 1231. a cylindrical upper portion; 12311. the screw rod is matched with the through hole part; 124. a sleeve lower cover portion; 1241. a lower cover through hole part; 13. an upper spring; 14. a lower spring; 15 a resilient carrier member; 151 an elastic carrier body portion; 152. a resilient carrier extension; 153. an elastic carrier steel ball accommodating part; 16. a screw member; 161. a lead screw body portion; 1612. a mating segment; 162. an abutting portion; 1621. an abutting hole part; 1622. abutting against the body part; 1623. abutting the axial extension; 17. a retainer ring member; 171. a retainer ring through hole portion; 18. a steel ball; 2. a valve seat assembly; 21. a valve seat; 211. a valve port; 2111. a valve port sealing part; 22. a first pipe receiving portion; 23. a second pipe receiving portion; 24. a guide seat; 241. an inner bore guide portion; 25. a connecting seat; 3. a nut assembly; 31. a nut; 32. a nut connector; 33. a slip ring; 34. a helical guide rail; 4. a rotor assembly; 41. a rotor magnet; 42. a rotor connecting portion; 43 a rotor stop; 5. outer casing

[ detailed description ] embodiments

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 7, wherein fig. 1 is a sectional view of a first embodiment of an electronic expansion valve provided by the present invention in a fully closed state, fig. 2 is a partial sectional view of the first embodiment of the electronic expansion valve provided by the present invention in a fully open state, fig. 3 is a partial sectional view of a valve needle of the first embodiment of the electronic expansion valve provided by the present invention just before being contacted with a valve port sealing portion, fig. 4 is a sectional view of a valve needle screw rod assembly in fig. 2, fig. 5 is an exploded view of the valve needle screw rod assembly in fig. 4, fig. 6 is a sectional view of a contact portion in the valve needle screw rod assembly, and fig. 7 is a sectional view of a spring carrier component in the valve needle screw rod assembly.

Referring to fig. 1 to 3, in an embodiment, the electronic expansion valve provided by the present invention is composed of a valve body and a stator coil. The valve body comprises a valve needle screw rod component 1, a valve seat component 2, a nut component 3, a rotor component 4 and a shell 5. The stator coil of the electronic expansion valve is connected with a driving controller, after the driving controller is electrified, a pulse driving signal is sent to the stator coil, the stator coil generates a periodically changing magnetic field, so that a rotor assembly 4 of the electronic expansion valve is driven to rotate forwards or reversely, the rotor assembly 4 is fixedly connected with a screw rod component 16 of a valve needle screw rod assembly 1, and the rotor assembly 4 can synchronously drive the screw rod component 16 to rotate when rotating. The screw rod part 16 of the valve needle screw rod component 1 is provided with an external thread, the inner hole part of the nut 31 of the nut component 3 is provided with an internal thread, the screw rod part 16 and the nut 31 are in threaded fit, and the screw rod part 16 can perform displacement motion along the axial direction while the rotor component 4 rotates, so that the rest part of the valve needle screw rod component 1 can be driven to realize the opening and closing action of the valve port 211.

The valve seat assembly 2 provided by the embodiment comprises a valve seat 21, a first pipe connecting part 22, a second pipe connecting part 23, a guide seat 24 and a connecting seat 25, wherein the first pipe connecting part 22, the second pipe connecting part 23, the guide seat 24 and the connecting seat 25 are fixedly assembled with the valve seat 21. The first connecting pipe portion 22 and the second connecting pipe portion 23 serve as inflow and outflow passages for fluid media of the electronic expansion valve, and are generally used for connecting to system pipes when the electronic expansion valve is installed in a cooling and heating system such as an air conditioner. The valve seat 21 is provided with a valve port 211 at a position near the center of the second pipe receiving portion 23, and a valve port seal portion 2111 is provided at an upper edge of the valve port 211.

An inner hole guide part 241 matched with the outer wall of the valve needle screw rod component 1 is arranged at the central inner hole position of the guide seat 24 of the valve seat component 1, and when the electronic expansion valve performs opening and closing actions, the inner hole guide part 241 provides a guide and guide effect for the valve needle screw rod component 1.

The upper side of the valve seat component 2 is provided with a nut component 3 coaxially, and the nut component 3 comprises a nut 31, a nut connecting body 32, a sliding ring 33 and a spiral guide rail 34. The nut 31 may be fixedly connected to the valve seat assembly 3 by welding or the like through a nut connector 32. A sliding ring 33 and a spiral guide rail 34 are arranged on the outer circle of the upper side of the nut 31, the sliding ring 33 can spirally rotate along the spiral guide rail 34 within the stroke range defined by the upper limit and the lower limit, and the sliding ring 33 and the spiral guide rail 34 are matched with the rotor assembly 4 for realizing the stroke control of the electronic expansion valve between the full opening and the full closing.

The rotor assembly 4 includes a rotor magnet 41, a rotor connecting portion 42, and a rotor stopper portion 43 (the rotor stopper portion 43 and the rotor magnet 41 may be integrally formed, and a separate assembly method is adopted in this embodiment). The rotor assembly 4 can be fixedly connected (for example, welded) with the screw rod part 16 of the valve needle screw rod assembly 1 through the rotor connecting body 4, and the rotor assembly 4 drives the screw rod part 16 to synchronously rotate under the driving of the stator coil. The rotor assembly 4 is provided with a rotor stopper 43 on the inner side, and the rotor stopper 43 is engaged with the slide ring 33 and the spiral guide rail 34 on the nut 31 to limit the rotor assembly 4 to rotate within a predetermined stroke range.

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

The valve needle screw assembly 1 mainly includes a valve needle 11, a sleeve part 12, an upper spring 13, a lower spring 14, an elastic carrier part 15 and a screw assembly 16, specifically, refer to fig. 4 to 6.

The sleeve member 12 mainly includes a first cylindrical portion 121 and a sleeve upper cover portion 122, the first cylindrical portion 121 is substantially a cylindrical structure with an open upper end, the sleeve upper cover portion 122 is fixedly connected to the upper end of the first cylindrical portion 121 by welding, and the sleeve upper cover portion 122 includes an upper through hole 1221 penetrating along the axial direction thereof.

The screw member 16 includes a screw body 161 and an abutting portion 162, and the screw body 161 and the abutting portion 162 may be fixedly connected by welding, or may be in an integrated structure, where the integrated structure is formed by machining an integrated body, and in the present embodiment, the screw body 161 and the abutting portion 162 are fixedly connected by welding.

Referring to fig. 6, the abutting portion 162 includes an abutting hole portion 1621, and the abutting hole portion 1621 may be a through hole penetrating through upper and lower surfaces of the abutting portion 162 or a blind hole structure. In the present embodiment, the abutment hole portion 1621 takes the form of a through hole. In addition, referring to fig. 5 specifically, the lead screw body 161 includes a matching section 1612, the matching section 1612 can extend into the abutting hole portion 1621, and after the matching section 1612 extends into the abutting hole portion 1621, the lead screw body 161 and the abutting portion 162 are fixedly connected by welding, screwing, or the like.

Specifically, in the present embodiment, the sleeve upper cover portion 122 can be inserted from the screw rod member 16 from top to bottom through the upper through hole 1221, but the abutting portion 16 of the screw rod member 16 can limit the sleeve upper cover portion 122 from passing through below the screw rod member 16, and when the sleeve upper cover portion 122 is about to pass through below the screw rod member 16, the sleeve upper cover portion 122 can abut against the abutting portion 162 to limit the sleeve upper cover portion 122 from passing through below the screw rod member 16.

Of course, the sleeve upper cover portion 122 is not limited to be sleeved from the screw rod member 16 from top to bottom through the upper sealing through hole 1221, the screw rod body portion 161 and the abutting portion 162 of the embodiment are fixedly connected by welding, or the sleeve upper cover portion 122 may be sleeved from the screw rod member from bottom to top or from top to bottom through the upper sealing through hole 1221, and then the screw rod body portion 161 and the abutting portion 162 are fixedly welded to limit the sleeve upper cover portion 122 from being separated from the lower end of the screw rod member 16.

After the first cylindrical portion 121 and the sleeve upper cover portion 122 are fixedly connected by welding, the abutting portion 162 of the screw member 16 is confined within the sleeve member 12, and the screw member 16 can move, but the movement is confined by the sleeve member 12, so that the screw member 16 and the sleeve member 12 are connected in a limited manner.

In addition, referring to fig. 1 to 5, inside the sleeve member 12, there are further provided an upper spring 13, a lower spring 14, and an elastic carrier member 15 located between the upper spring 13 and the lower spring 14 and capable of abutting against the upper spring 13 and the lower spring 14.

Specifically, the upper end of the upper spring 13 abuts against the abutting portion 162, the lower end of the upper spring 13 abuts against the elastic force carrier member 15, the upper end of the lower spring 14 abuts against the elastic force carrier member 15, and the lower end of the lower spring 14 abuts against the lower bottom surface of the sleeve member 12.

At this time, the elastic force carrier member 15 positioned between the upper spring and the

lower spring

13 and 14 receives the elastic force of the upper spring 13 and the elastic force of the lower spring 14.

Further, the valve needle 11 includes a large diameter section 111 and a small diameter section 112, and the outer diameter of the large diameter section 111 is larger than that of the small diameter section 112, and it is noted that the small diameter section 112 is not necessarily equal in its axial direction, and when the outer diameter of the small diameter section 112 is different in its axial direction, it is understood that the outer diameter of the large diameter section 111 is larger than that of the small diameter section 112, which means the outer diameter where the outer diameter of the small diameter section 112 is the largest, and the outer diameter of the large diameter section 111 is not necessarily equal in its axial direction.

The lower end of the first cylindrical portion 121 includes a needle fitting through-hole portion 1211. The needle fitting through hole 1211 is a through hole penetrating through the lower surface of the first cylindrical portion 121. At this time, the needle fitting through-hole portion 1221 has an inner diameter larger than an outer diameter of the small-diameter section 112 of the needle, the needle fitting through-hole portion 1211 has an inner diameter smaller than an outer diameter of the large-diameter section 111 of the needle, and when the outer diameters of the large-diameter section 111 are not equal in the axial direction thereof, the outer diameter of the large-diameter section 111 refers to an outer diameter at the lowermost portion of the large-diameter section 111. At this time, the small-diameter section 112 of the valve needle 11 can pass through the valve needle fitting through-hole 1211 from the inside of the sleeve member 12, but the large-diameter section 111 is restricted by the valve needle fitting through-hole 1211, so that the valve needle 11 and the sleeve member 12 are connected in a limited manner.

Depending on the configuration of the upper spring 13 and the lower spring 14, the force applied to the valve needle 11 can be roughly described as follows.

In the first case: the resultant force to which the valve needle 11 is subjected is 0. Under the condition that the valve needle screw assembly 1 is not subjected to an external force (i.e., the valve needle 11 is not in contact with the valve port 211), the elastic force of the upper spring 13 on the elastic carrier component 15 (i.e., the pressure applied to the elastic carrier component 15 from top to bottom) is F1, the elastic force of the lower spring 14 on the elastic carrier component 15 (i.e., the pressure applied to the elastic carrier component 15 from bottom to top) is F2, and F1 is F2, at this time, the elastic carrier component 15 can be located at a critical point of contact and separation with the valve needle 11, the elastic carrier component 15 can also be in a state of separation from the valve needle 11, at this time, no interaction force exists between the valve needle 11 and the elastic carrier component 15, and the valve needle 11 is suspended from the sleeve component 12 by.

In the electronic expansion valve with the upper spring 13 and the lower spring 14 configured in this state, at the moment that the valve needle 11 of the valve needle screw assembly 1 contacts the valve port 211, the valve needle 11 is not under the pressure of the spring, and at this moment, the pressure of the valve needle 11 on the valve port 211 is smaller, so that the rotation torque of the valve needle 11 is smaller, the valve needle 11 is not easy to rotate relative to the valve port 211, and the abrasion of the valve needle 11 and the valve port 211 caused by relative rotation or impact of the valve needle 11 on the valve port 211 can be reduced.

When the needle screw assembly 1 descends to further close the valve port 211, the needle 1 rises relative to the sleeve member 12, so that the upper end of the needle 11 abuts against the elastic carrier member 15, at this time, the needle 11 is subjected to a spring load (i.e., the pressure of the elastic carrier member 15 against the needle 11 is mainly provided by the upper spring 13), if the elastic coefficient of the upper spring 13 is K1, the elastic coefficient of the lower spring 14 is K2, the needle 11 abuts against the elastic carrier member 15 and then continues to move upward to X, at this time, the pressure of the needle 11 (the supporting force of the valve port 211 against the needle 11) is applied to the valve port 211 (F1 + K1X- (F2-K2X), and in an initial state, F1 is F2, so that the pressure of the needle 11 (the supporting force of the valve port 211 against the needle 11) is K1X + K2X, and at this time, the pressure also provides the capability of the needle 11 to close the valve port 211.

In the second case: the resultant force experienced by the valve needle 11 is different from 0. Under the condition that the valve needle screw assembly 1 is not subjected to an external force (i.e., the valve needle 11 is not in contact with the valve port 211), the elastic force of the upper spring 13 on the elastic carrier part 15 (i.e., the pressure applied to the elastic carrier part 15 from top to bottom) is F1, the elastic force of the lower spring 14 on the elastic carrier part 15 (i.e., the pressure applied to the elastic carrier part 15 from bottom to top) is F2, and the supporting force of the valve needle 11 on the elastic carrier part 15 is F3, in this case, F1 is F2+ F3, and the supporting force of the valve needle 11 on the elastic carrier part 15 is mainly provided by the supporting force of the sleeve part 12 on the large-diameter section 111 of the valve needle 11.

In the electronic expansion valve with the upper spring 13 and the lower spring 14 configured in this state, at the moment when the valve needle 11 of the valve needle screw assembly 1 contacts the valve port 211, the force applied to the valve needle 11 is F3, that is, after the valve needle 11 contacts the valve port 211, the supporting force of the valve needle 11 on the spring carrier member 15 is provided by the sleeve member 12 and is changed to be provided by the valve port 211, and at this time, the pressure applied to the valve needle 11 by the valve port 211 is F3 smaller, so that the electronic expansion valve configured in this state can conveniently reduce the magnitude of F3 by changing the elastic force of the upper spring 13 and the lower spring 14 on the elastic carrier member 15 in the initial state, the rotation torque of the valve needle 11 can be made smaller, the valve needle 11 is not easy to rotate relative to the valve port 211, and the abrasion of the valve needle 11 and the valve port 211 caused by relative rotation or impact of the.

When the valve needle screw assembly 1 descends to further close the valve port 211, the valve needle 11 rises relative to the sleeve component 12, at this time, the valve needle 11 is subjected to a load of the spring (i.e., the pressure of the elastic carrier component 15 on the valve needle 11 is mainly provided by the upper spring 13), if the elastic coefficient of the upper spring 13 is K1, the elastic coefficient of the lower spring 14 is K2, the valve needle 11 continuously displaces upward after abutting against the valve port 211 to be X, at this time, the pressure of the valve needle 11 (the supporting force of the valve port 211 on the valve needle 11) applied to the valve port 211 is F1+ K1X- (F2-K2X), and F1-F2 is F3, therefore, when the pressure of the valve port 211 applied to the valve needle 11 is F3+ K1X + K2X, the force can provide the valve needle 11 with the capability of closing the valve port 211.

It should be noted that the above stress applied to the elastic carrier member 15 is ideally performed, and the gravity of the elastic carrier member 15 itself is not considered, which is intended to make the technical solution of the present invention easier for those skilled in the art to understand, in practical cases, the electronic expansion valve to which the valve needle screw assembly 1 is applied may be complicated, for example, the elastic carrier member 15 is subjected to the friction force of the inner wall of the sleeve member 12 against it, and the stress applied to the elastic carrier member 15 and the valve needle 11 cannot constitute a limitation to this solution.

Referring to fig. 6 in particular, in order to reduce the displacement of the upper spring 11 in the sleeve member 12, the abutting portion 162 of the present embodiment includes an abutting main body portion 1622 and an abutting extension portion 1623, the abutting extension portion 1623 extends downward along the lower surface of the abutting main body portion 1622, and the upper spring 13 is sleeved on the outer periphery of the abutting extension portion 1623, at this time, the upper spring 13 abuts against the abutting main body portion 1622.

The needle screw assembly 1 of the electronic expansion valve is restricted by the abutting extension 1623 when the upper end of the upper spring 13 is about to shift, so as to reduce the shift of the upper spring 13 in the sleeve member 12.

Referring to fig. 7 specifically, in order to reduce the situation that the upper spring 13 is offset in the sleeve member 12, the elastic carrier member 15 provided in this embodiment includes an elastic carrier body 151 and an elastic carrier extension 1623, the elastic carrier extension 152 extends radially upward along the upper surface of the elastic carrier body 151 along the elastic carrier body 151, and the upper spring 13 is sleeved on the outer periphery of the elastic carrier extension 152, at this time, the lower spring 14 abuts against the elastic carrier body 151.

The valve needle screw assembly 1 of the electronic expansion valve is limited by the elastic carrier extension part 152 when the lower end of the upper spring 13 is about to shift, so that the situation that the upper spring 13 shifts in the sleeve part 12 can be reduced.

Of course, the elastic carrier extension portion 15 may also extend radially downward along the lower surface of the elastic carrier body portion 151, and the lower spring 14 is sleeved on the outer periphery of the elastic carrier extension portion 152, so that when the lower spring 14 is about to deflect, it is limited by the elastic carrier extension portion 152, and the deflection inside the sleeve member 12 of the lower spring 14 can be reduced.

When the valve needle 11 abuts against the elastic carrier part 15, there is a friction force between the valve needle 11 and the elastic carrier part 15, and when the elastic carrier part 15 rotates, the valve needle 11 sometimes rotates due to the friction force, and if the valve needle 11 contacts the valve port 211, the valve needle 11 and the valve port 211 are also worn.

Referring to fig. 1 to 4, in order to reduce the wear of the valve needle 11 and the valve port 211, the valve needle assembly 1 of the electronic expansion valve provided in this embodiment further includes a steel ball 18, the valve needle 11 is provided with a steel ball receiving portion 113, the steel ball receiving portion 113 is approximately a structure in which the upper end of the valve needle 11 is recessed, the steel ball 18 is placed in the steel ball receiving portion 113, and the surface of the steel ball 18 is relatively smooth, so that the friction coefficient between the steel ball 18 and the elastic carrier member 15 is relatively smaller than the friction coefficient between the valve needle 11 and the elastic carrier member 15, which can reduce the phenomenon that the valve needle 11 rotates due to the friction force, and can also relatively reduce the wear between the valve needle.

Correspondingly, the elastic carrier part 15 includes an elastic carrier steel ball accommodating portion 153, the elastic carrier steel ball accommodating portion 153 is approximately a structure in which the elastic carrier part 15 is recessed upwards along the lower surface thereof, a part of the steel ball 18 is placed in the elastic carrier steel ball accommodating portion 153, which can further increase the stability of the position of the steel ball 18, and specifically, when the elastic carrier part 15 is provided with the elastic carrier extension portion 152 extending downwards, the elastic carrier steel ball accommodating portion 153 is a structure in which the steel ball is recessed upwards along the lower surface of the elastic carrier extension portion 152; when the elastic carrier member 15 is not provided with the elastic carrier extension portion 152 extending downward, the elastic carrier ball receiving portion 153 is a structure recessed upward along the lower surface of the elastic carrier body portion 151.

Referring to fig. 8 in detail, fig. 8 is a sectional view of a valve needle screw assembly of an electronic expansion valve according to a second embodiment of the present invention.

For convenience of description of the present embodiment, the same reference numerals are used for components of the present embodiment having the same structure and the same function as those of the first embodiment, and the description of the components of the first embodiment is also applicable to the second embodiment, and the differences from the first embodiment will be described in detail below.

In the present embodiment, the needle screw assembly 1 further includes a retainer ring member 17, the retainer ring member 17 is located in the sleeve member 12, in which case, an upper surface of the retainer ring member 17 abuts against the lower spring 14, the retainer ring member 17 includes a retainer ring through hole portion 171, an outer diameter of the large diameter section 111 of the needle 11 is larger than an inner diameter of the retainer ring through hole portion 171, an outer diameter of the small diameter section 112 of the needle 11 is smaller than the inner diameter of the retainer ring through hole portion 171, and the retainer ring member 17 is directly or indirectly supported on a bottom portion of the sleeve member 12, in which case, the small diameter section 112 of the needle 11 can pass through the retainer ring through hole portion 171 of the retainer ring member 17, but the large diameter section 111 cannot pass through the retainer ring through hole portion 171 of the retainer ring member 17.

Referring to fig. 9, fig. 9 is a sectional view of a valve needle screw assembly of an electronic expansion valve according to a third embodiment of the present invention.

The sleeve member 12 mainly includes a second cylindrical portion 123 and a lower sleeve cover portion 124, the second cylindrical portion 123 is substantially a cylindrical structure with an open lower end, the lower sleeve cover portion 124 is fixedly connected to the lower end of the second cylindrical portion 123 by welding, and the lower sleeve cover portion 124 includes a lower seal through hole portion 1241 penetrating along the axial direction thereof.

The screw member 16 is connected to the sleeve member 12 in a limited manner, specifically, in this embodiment, the second cylindrical portion 123 includes a cylindrical upper portion 1231, the cylindrical upper portion 1231 includes a screw fitting through hole 12311 penetrating vertically therethrough, and the second cylindrical portion 123 can be fitted from the screw member 16 from top to bottom through the screw fitting through hole 12311, but the abutting portion 16 of the screw member 16 can limit the second cylindrical portion 123 from penetrating below the screw member 16, and when the second cylindrical portion 123 is going to penetrate below the screw member 16, the cylindrical upper portion 1231 can abut against the abutting portion 162 to limit the second cylindrical portion 123 from penetrating below the screw member 16.

Of course, the second cylindrical portion 123 is not limited to be inserted from the screw member 16 from top to bottom through the screw fitting through hole 12311, and the screw body 161 and the abutting portion 162 of the present embodiment are integrally formed.

The sleeve member 12 further includes a sleeve lower cap portion 1241, and the sleeve lower cap portion 1241 includes a lower cap through-hole portion 1241. The lower cover through hole 1241 is a through hole penetrating the upper and lower surfaces of the sleeve lower cover 1241. At this time, the inside diameter of the lower cap through hole portion 1241 is larger than the outside diameter of the small diameter section 112 of the needle, and the inside diameter of the lower cap through hole portion 1241 is smaller than the outside diameter of the large diameter section 111 of the needle. At this time, the small diameter section 111 of the needle 11 can pass through the lower cover through hole 1241 from inside the sleeve member 12, but the large diameter section 111 is restricted by the lower cover through hole 1241, and therefore, the needle 11 and the sleeve member 12 are connected in a limited manner.

In addition, the invention is explained aiming at a specific electronic expansion valve structure, and aims to improve a valve needle screw rod component 1 of the electronic expansion valve, and other components of the electronic expansion valve, such as a valve seat component 2, a nut component 3 and a rotor component 4, can adopt a general technology and can also adopt other electronic expansion valve structures which can realize the same function. The present invention is not limited to the above-mentioned components, and those skilled in the art can apply the same to all similar electronic expansion valve structures according to the technical solutions disclosed in the present invention.

It should be noted that, in the present embodiment, the terms of orientation such as up, down, left, right, etc. are used as references in the drawings of the specification and are introduced for convenience of description; and the use of ordinal numbers such as "first," "second," etc., in the component names, are also included for convenience of description and are not intended to imply any limitation on the order in which the components are recited.

In the present specification, the description of "abutting" of components in the electronic expansion valve includes both direct abutting and indirect abutting between the components.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An electronic expansion valve is characterized by comprising a valve needle screw rod assembly (1), wherein the valve needle screw rod assembly (1) comprises a valve needle (11), a sleeve part (12), an upper spring (13), a lower spring (14), an elastic carrier part (15) and a screw rod part (16);

the screw rod component (16) comprises a screw rod body part (161) and an abutting part (162), the screw rod body part (161) and the abutting part (162) are fixedly connected or are in an integral structure, the screw rod component (16) is in limit connection with the sleeve component (12), and the valve needle (11) is in limit connection with the sleeve component (12);

the upper spring (13), the lower spring (14) and the elastic carrier member (15) are positioned in the sleeve member (12), the upper end of the upper spring (13) abuts against the abutting portion (162), the lower end of the upper spring (13) abuts against the elastic carrier member (15), the upper end of the lower spring (14) abuts against the elastic carrier member (15), and the lower end of the lower spring (14) abuts against the sleeve member (12).

2. The electronic expansion valve according to claim 1, wherein the sleeve member (12) includes a first cylindrical portion (121) and a sleeve upper cover portion (122), the first cylindrical portion (121) and the sleeve upper cover portion (122) are welded and fixed, the sleeve upper cover portion (122) includes an upper seal through hole portion (1221), the screw member (16) is inserted through the upper seal through hole portion (1221), and the abutting portion (162) is capable of abutting against the sleeve upper cover portion (122).

3. The electronic expansion valve according to claim 2, wherein the valve needle (11) includes a large diameter section (111) and a small diameter section (112), the first cylindrical portion (121) includes a needle fitting through hole portion (1221), an inner diameter of the needle fitting through hole portion (1221) is larger than an outer diameter of the small diameter section (112), an inner diameter of the needle fitting through hole portion (1221) is smaller than an outer diameter of the large diameter section (111), and the valve needle (11) is capable of abutting against the first cylindrical portion (121).

4. The electronic expansion valve according to claim 1, wherein the sleeve member (12) includes a second cylindrical portion (123) and a sleeve lower cover portion (124), the second cylindrical portion (123) is welded and fixed to the sleeve lower cover portion (124), the second cylindrical portion (123) includes a cylindrical upper portion (1231), the cylindrical upper portion (1231) includes a screw fitting through hole portion (12311), the screw member (16) is inserted through the screw fitting through hole portion (12311), and the abutting portion (162) is capable of abutting against the cylindrical upper portion (1231).

5. The electronic expansion valve according to claim 4, wherein the sleeve lower cover portion (124) includes a lower seal through hole portion (1241), the valve needle (11) includes a large diameter section (111) and a small diameter section (112), an inner diameter of the lower seal through hole portion (1241) is larger than an outer diameter of the small diameter section (112), an inner diameter of the lower seal through hole portion (1241) is smaller than an outer diameter of the large diameter section (111), and the valve needle (11) is capable of abutting against the sleeve lower cover portion (1241).

6. The electronic expansion valve according to claim 2 or 4, wherein the valve needle screw assembly (1) further comprises a retainer ring member (17), the retainer ring member (17) is located inside the sleeve member (12), the retainer ring member (17) abuts against the lower spring (14), the retainer ring member (17) comprises a retainer ring through hole portion (171), the valve needle (11) comprises a large diameter section (111) and a small diameter section (112), an inner diameter of the retainer ring through hole portion (171) is larger than an outer diameter of the small diameter section (112), and an inner diameter of the retainer ring through hole portion (171) is smaller than an outer diameter of the large diameter section (111).

7. An electronic expansion valve according to any one of claims 1-6, wherein the abutment portion (162) comprises an abutment through hole portion (1621), the screw member (16) comprises a fitting section (1612) fitted with the abutment through hole portion (1621), the fitting section (1612) is inserted through the abutment through hole portion (1621), and the fitting section (1612) is welded to the abutment through hole portion (1621).

8. The electronic expansion valve of claim 7, wherein the abutment portion (162) comprises an abutment body portion (1622) and an abutment extension portion (1623), the abutment extension portion (1623) extending radially along a lower surface of the abutment body portion (1622), the upper spring (13) abutting the abutment body portion (1622), the upper spring (13) being sheathed over the abutment extension portion (1623).

9. An electronic expansion valve according to any of claims 1-6, wherein the resilient carrier member (15) comprises a resilient carrier body portion (151) and a resilient carrier extension portion (152);

the elastic carrier extension part (152) extends upwards along the surface of the elastic carrier body part (151), the upper spring (13) is sleeved on the elastic carrier extension part (152), and the upper spring (13) is abutted against the elastic carrier body part (151);

and/or the elastic carrier extension part (152) extends downwards along the surface of the elastic carrier body part (151), the lower spring (14) is sleeved on the elastic carrier extension part (151), and the lower spring (14) is abutted against the elastic carrier body part (151).

10. An electronic expansion valve according to any of claims 1-3, wherein the valve needle screw assembly (1) further comprises a steel ball (18), the valve needle (11) comprises a steel ball receiving portion (113), the steel ball receiving portion (113) is substantially recessed along the upper end of the valve needle (11), the steel ball (18) is disposed in the steel ball receiving portion (113), and the steel ball (18) can abut against the elastic carrier member (15).