阅读说明：本技术 一种电子膨胀阀 (Electronic expansion valve ) 是由 不公告发明人 于 2020-05-27 设计创作，主要内容包括：一种电子膨胀阀,其特征在于,包括阀体部件、丝杆阀针组件以及螺母部件,所述阀体部件包括阀口部,所述螺母部件与所述阀体部件固定连接,所述丝杆阀针组件包括丝杆和阀针,所述丝杆包括丝杆螺纹部,所述螺母部件包括螺母螺纹部,所述丝杆螺纹部与所述螺母螺纹部螺纹配合,通过螺纹配合作用所述阀针能够接近或远离所述阀口部；所述电子膨胀阀还包括止动结构,所述止动结构包括第一止动部和第二止动部,所述第一止动部与所述螺母部件为一体成型结构,或所述第一止动部与所述螺母部件固定连接或限位连接,所述第二止动部与所述丝杆为一体成型结构,或所述第二止动部与所述丝杆固定连接或限位连接,所述第一止动部能够与所述第二止动部相抵。(An electronic expansion valve is characterized by comprising a valve body part, a screw rod valve needle assembly and a nut part, wherein the valve body part comprises a valve port part, the nut part is fixedly connected with the valve body part, the screw rod valve needle assembly comprises a screw rod and a valve needle, the screw rod comprises a screw rod thread part, the nut part comprises a nut thread part, the screw rod thread part is in thread fit with the nut thread part, and the valve needle can approach or be far away from the valve port part through the thread fit effect; the electronic expansion valve further comprises a stopping structure, wherein the stopping structure comprises a first stopping part and a second stopping part, the first stopping part and the nut component are of an integrally formed structure, or the first stopping part and the nut component are fixedly connected or in a limiting connection mode, the second stopping part and the lead screw are of an integrally formed structure, or the second stopping part and the lead screw are fixedly connected or in a limiting connection mode, and the first stopping part can abut against the second stopping part.)

1. An electronic expansion valve is characterized by comprising a valve body part, a screw rod valve needle assembly and a nut part, wherein the valve body part comprises a valve port part, the nut part is fixedly connected with the valve body part, the screw rod valve needle assembly comprises a screw rod and a valve needle, the screw rod comprises a screw rod thread part, the nut part comprises a nut thread part, the screw rod thread part is in thread fit with the nut thread part, and the valve needle can approach or be far away from the valve port part through the thread fit effect;

the electronic expansion valve further comprises a stopping structure, wherein the stopping structure comprises a first stopping part and a second stopping part, the first stopping part and the nut component are of an integrally formed structure, or the first stopping part and the nut component are fixedly connected or in a limiting connection mode, the second stopping part and the lead screw are of an integrally formed structure, or the second stopping part and the lead screw are fixedly connected or in a limiting connection mode, and the first stopping part can abut against the second stopping part.

2. The electronic expansion valve according to claim 1, wherein the nut member comprises a nut body including a base portion and a side wall portion, the side wall portion extending axially from the base portion in a direction approaching the valve opening portion, the base portion including the nut threaded portion, the lead screw further including a lead screw guide portion and a transition portion, the transition portion being located between the lead screw threaded portion and the lead screw guide portion, the lead screw guide portion being in sliding guiding fit or clearance fit with the side wall portion.

3. An electronic expansion valve according to claim 2, wherein the first stopper portion comprises a first stopper projection, the second stopper portion comprises a second stopper projection, the base portion has a base end surface, the first stopper projection is axially extended in a direction approaching the valve port portion from the base end surface, the first stopper projection has a first stopper end surface, the screw guide portion has a guide end surface, the second stopper projection is axially extended in a direction away from the valve port portion from the guide end surface, the second stopper projection has a second stopper end surface, and the first stopper end surface can abut against the second stopper end surface.

4. An electronic expansion valve according to claim 2, wherein the first stopper portion comprises a first stopper projection, the second stopper portion comprises a second stopper projection, the base portion has a base end surface, the first stopper projection projects radially from the inner peripheral wall of the side wall portion in a direction close to the central axis of the lead screw, the first stopper projection has a first stopper end surface, the lead screw guide portion has a guide end surface, the second stopper projection projects radially in a direction close to the central axis of the lead screw in a direction close to the transition portion, the second stopper projection has a second stopper end surface, and the first stopper end surface is capable of abutting against the second stopper end surface.

5. The electronic expansion valve according to claim 3 or 4, wherein the first stopper projection is integrally formed with the nut body, or the first stopper projection is integrally formed with the nut member by powder sintering, or the base portion and the side wall portion are separately provided, and the first stopper projection is fixedly connected to the side wall portion after being integrally formed with the base portion, or the first stopper projection is fixedly connected to the base portion after being integrally formed with the side wall portion; after the second stop boss and the screw rod guide part are integrally injection-molded, the screw rod guide part is fixedly connected with other parts of the screw rod, or the second stop boss and the screw rod are integrally molded in a powder sintering mode, or the second stop boss and the external thread part are integrally molded and then fixedly connected with other parts of the screw rod; or the second stop boss and the transition part are fixedly connected with other parts of the screw rod after being integrally formed.

6. An electronic expansion valve according to claim 2, wherein the first stopper portion comprises a stopper pin, the second stopper portion comprises a stopper engaging member, the side wall portion is provided with a first through hole, the stopper pin comprises a stopper body portion and a surrounding portion, the stopper body portion extends from the surrounding portion to a direction close to the central axis of the nut member, the stopper body portion passes through the first through hole, the stopper body portion is in clearance fit with the side wall portion, the surrounding portion is fitted with the nut body and clamps the peripheral wall of the side wall portion, the stopper pin comprises a stopper pin side wall, the stopper engaging member is engaged with the transition portion or the stopper engaging member is welded and fixed to the screw guide portion, the stopper engaging member comprises a notch including a base body and a catching protrusion, the catching protrusion extends from the base body to a direction away from the valve opening portion, the side wall of the stop pin can be abutted against the clamping protrusion.

7. The electronic expansion valve according to claim 6, wherein the first through-hole penetrates through an inner peripheral wall and an outer peripheral wall of the side wall portion, and the first through-hole has a first center line extending in a direction relatively close to a center axis of the nut member.

8. The electronic expansion valve according to claim 2, wherein the first stopper portion comprises a stopper pin, the second stopper portion comprises a stopper engaging member, the side wall portion has a second through hole, the stopper pin passes through the second through hole, the stopper pin comprises a stopper body portion and a surrounding portion, the stopper body portion is substantially protruded from the surrounding portion in a direction away from the central axis of the nut member, the stopper body portion passes through the second through hole, the stopper body portion is in clearance fit with the side wall portion, the surrounding portion is fitted with the nut body and clamps the outer peripheral wall of the side wall portion, the stopper pin has a stopper pin end surface, the stopper engaging member is engaged with the transition portion or the stopper engaging member is welded and fixed to the lead screw guide portion, the stopper engaging member has a notch, including base member and card protruding, the card protruding roughly by the base member is towards keeping away from valve port portion direction axial extension is protruding, the stop pin terminal surface can with the protruding counterbalance of card.

9. The electronic expansion valve according to claim 8, wherein the second through hole penetrates through an inner peripheral wall and an outer peripheral wall of the side wall portion, the second through hole having a second center line extending in a direction relatively away from a center axis of the nut member.

10. The electronic expansion valve according to any of claims 6-9, wherein the retaining pin is insert-molded with the nut member, or the retaining pin is press-fitted with the sidewall portion to fixedly connect the retaining pin with the nut member, or the retaining pin is welded and fixed with the sidewall portion.

11. The electronic expansion valve according to any of claims 6-9, wherein the locking engaging member has a locking groove, the locking groove is adapted to the transition portion, the base body has a substantially plate-shaped structure with the notch, the locking protrusion includes a locking protrusion connecting portion, a locking protrusion transition portion, and a locking protrusion flanging portion, the locking protrusion transition portion is located between the locking protrusion connecting portion and the locking protrusion flanging portion, the locking protrusion flanging portion extends in a direction away from the valve opening portion, and the locking protrusion and the base body are integrally formed or fixedly connected.

12. The electronic expansion valve according to claim 2, wherein the base portion has a third through hole having a center line substantially parallel to a central axis of the screw, the first stopper portion includes a stopper pin, the second stopper portion includes a stopper engaging member, the stopper pin includes a stopper body portion, a hook, and an engaging portion, the stopper body portion passes through the third through hole, the stopper body portion extends axially downward in a direction approaching the valve port portion, a groove is provided in an outer peripheral portion of the base portion, the hook engages and is fitted into the groove, and the engaging portion abuts against an upper end surface of the base portion.

13. The electronic expansion valve according to claim 2, wherein the base has a base end surface, the screw guide has a guide end surface, the first stopper is the base end surface, the second guide is the guide end surface, and the base end surface and the guide end surface are capable of abutting each other.

14. The electronic expansion valve according to claim 1, wherein the second stopper portion is set to have an abutment position against the first stopper portion, and the nut member includes a highest end surface position and a lowest end surface position, the abutment position being located between the highest end surface position and the lowest end surface position.

[ 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 ]

As shown in fig. 1, the electronic expansion valve includes a magnetic rotor 1, a lead screw 2, a stop rod 3, a nut 61 and a sliding ring 63, the lead screw 2 is fixedly connected with the magnetic rotor 1, the stop rod 3 is fixedly connected with the rotor 1, a guide rail 62 is arranged outside the nut 61, the guide rail 62 includes an upper stop section 62a and a lower stop section 62b, the stop rod 3 drives the sliding ring 63 to rotate on the guide rail 62 along with the rotation of the magnetic rotor 1, and due to the limiting function of the upper stop section 62a and the lower stop section 62b, the magnetic rotor 1 stops rotating at the two positions, thereby limiting the lead screw 2 from further moving along the axial direction.

[ summary of the invention ]

The invention aims to provide an electronic expansion valve with a new structure, wherein the whole stopping structure is simpler.

The invention provides an electronic expansion valve, which comprises a valve body part, a screw rod valve needle assembly and a nut part, wherein the valve body part comprises a valve port part, the nut part is fixedly connected with the valve body part, the screw rod valve needle assembly comprises a screw rod and a valve needle, the screw rod comprises a screw rod thread part, the nut part comprises a nut thread part, the screw rod thread part is in thread fit with the nut thread part, and the valve needle can approach or be far away from the valve port part through the thread fit;

the electronic expansion valve further comprises a stopping structure, wherein the stopping structure comprises a first stopping part and a second stopping part, the first stopping part and the nut component are of an integrally formed structure, or the first stopping part and the nut component are fixedly connected or in a limiting connection mode, the second stopping part and the lead screw are of an integrally formed structure, or the second stopping part and the lead screw are fixedly connected or in a limiting connection mode, and the first stopping part can abut against the second stopping part.

The electronic expansion valve comprises a stop structure, wherein the stop structure comprises a first stop part and a second stop part, and the first stop part is fixedly connected or in limited connection with a nut component; the second stop part and the screw rod are of an integral structure, or the second stop part is fixedly connected or in limited connection with the screw rod, the first stop part can abut against the second stop part, and the stop structure is overall simpler.

[ description of the drawings ]

FIG. 1 is a cross-sectional view of an electronic expansion valve according to the prior art;

fig. 2 is a sectional view of the overall structure of an electronic expansion valve according to a first embodiment of the present invention (valve closed state);

fig. 3 is a sectional view (open state) of the overall structure of the electronic expansion valve according to the first embodiment of the present invention;

FIG. 4 is an enlarged perspective view of the nut member of FIG. 2;

FIG. 5 is an enlarged perspective view of the lead screw of FIG. 2;

fig. 6 is a sectional view of an overall structure of an electronic expansion valve according to a third embodiment of the present invention;

fig. 7 is a cross-sectional view of the overall structure of an electronic expansion valve according to a third embodiment of the present invention (no stop pin is provided);

FIG. 8 is a perspective view of the retaining pin of FIG. 6 mated with a nut member;

fig. 9 is a schematic perspective view of a stop pin structure of the electronic expansion valve of fig. 6;

fig. 10 is a schematic perspective view of a screw rod structure of the electronic expansion valve of fig. 6;

FIG. 11 is a perspective view of a stop engaging member of the electronic expansion valve of FIG. 6;

fig. 12 is a sectional view of a stop pin structure of an electronic expansion valve according to a fourth embodiment of the present invention;

fig. 13 is a sectional view of the entire structure of an electronic expansion valve according to a fourth embodiment of the present invention (valve-closed state);

fig. 14 is a sectional view (open state) of the overall structure of an electronic expansion valve according to a fourth embodiment of the present invention;

fig. 15 is a schematic sectional view of an electronic expansion valve in a top view according to a fifth embodiment of the present invention;

fig. 16 is a schematic perspective view of a stop pin of the electronic expansion valve of fig. 15;

fig. 17 is a schematic view of an overall structure of an electronic expansion valve according to a fifth embodiment of the present invention (no stop pin is provided);

FIG. 18 is a schematic view of an electronic expansion valve according to a fifth embodiment of the present invention

[ detailed description ] embodiments

It should be noted that, in the present application, the locking structure of the electronic expansion valve, the matching relationship between the first locking part and the nut component, and the matching relationship between the second locking part and the screw rod are emphasized, and the adaptive adjustment of the structure of other structures of the electronic expansion valve, such as the valve needle screw rod assembly, the rotor component, the coil component, etc., can be performed according to the system or other needs and according to the occasion.

The application provides an electronic expansion valve, including valve body component 10, nut component 50, feed screw needle assembly 60, valve body component 10 includes valve port portion 11, valve port portion 11 is equipped with valve port 110, valve body component 10 can be integrated into one piece by lathing etc., valve port portion 11 refers to the part of valve body component 10 forming valve port 110, valve port portion 11 can be integrated with valve body component 10 as an organic whole structure or can be set up after the split body fixedly connects, nut component 50 is fixedly connected with valve body component 10, needle assembly 60 includes feed screw 61 and needle 62, feed screw 61 and needle 62 can set up the needle cover, can be equipped with the elastic component in the needle cover, feed screw 61 realizes the floating connection with needle 62 through the elastic component, or feed screw 61 is equipped with the support portion, needle 62 is equipped with the suspension portion, feed screw 61 and needle 62 hang and support the connection, in this application do not restrict the structure of feed screw needle assembly 60, the screw 61 includes a screw thread portion 611, i.e., an external screw thread portion, the nut member 50 includes a nut thread portion 53, i.e., an internal screw thread portion, the internal screw thread portion and the external screw thread portion form a thread feeding mechanism of the electronic expansion valve, the screw thread portion 611 is in thread fit with the nut thread portion 53, the valve needle 62 can approach to or be away from the valve port 110 of the valve port portion 11 through the thread fit to adjust the flow rate of the refrigerant flowing through the valve port 110, the electronic expansion valve further includes a stopper structure 100, the stopper structure 100 includes a first stopper 70 and a second stopper 80, the first stopper 70 and the nut member 50 are integrally formed, or the first stopper 70 and the nut member 50 are fixedly connected or in a limiting manner, the second stopper 80 and the screw 61 are integrally formed, or the second stopper 80 and the screw 61 are fixedly connected or in a limiting manner, the first stopper can abut against the second stopper, by the above arrangement, compared with the stop structure of the electronic expansion valve provided by the background art, the stop structure has the advantages that the number of parts is relatively small, the processing and the assembly of the stop structure are more convenient, and the whole stop structure is simpler.

Referring to fig. 1-5, in the first embodiment of the electronic expansion valve provided by the present application, the valve body 10 may further include a guiding portion 13, the guiding portion 13 may provide a guiding function for the valve needle 62, the valve needle 62 may be slidably engaged with the guiding portion 13, and includes a nut body 51 and a connecting portion 51, the nut body 51 includes a base portion 511 and a side portion 512, the nut body 51 may be made of a plastic material, and may be insert-molded with the connecting portion 51 through an injection molding process, the connecting portion 51 is welded and fixed with the valve body 10 to integrally fix the nut member 50 to the valve body 10, or the nut member 50 may be directly fixedly connected to the valve body 10 by using a metal material, it should be noted that the nut member 50 set forth in the present application may be a structure integrally formed by lathing or the like, or a nut assembly structure formed by fixedly connecting or insert-molding several components, the electronic expansion valve further includes a rotor component, the rotor component includes a rotor and a rotor seat, the screw 61 includes a screw end 614, the screw end 614 can be fixedly connected or slidably engaged with the rotor seat, the screw 61 rotates synchronously when the rotor rotates, the nut body 51 includes a base 511 and a sidewall 512, the base 511 has a base end face 5111, the base 511 includes a nut threaded portion 53, the sidewall 512 extends axially and downwardly from the base 511 in a direction close to the valve opening 11, the screw 61 further includes a screw guide portion 612 and a transition portion 613, the transition portion 613 is located between the screw threaded portion 611 and the screw guide portion 612, the transition portion 613 can be a smooth section structure, the screw guide portion 612 has a guide end face 6121, it should be noted that the screw 61 can also eliminate the transition portion 613, so that the upper portion of the screw guide portion 612 is fully provided with the screw threaded portion 611 of a full-thread section, the screw 61 may also be configured without the screw guide 612, and a structure that the screw guide 612 is configured to have a slightly larger outer diameter than the screw thread portion 611 may also achieve the technical effects achieved by the present application, in the present embodiment, the example that the screw 61 includes the transition portion and the screw guide is taken as an example, the electronic expansion valve further includes the receiving cavity 50A, the screw guide 612 is substantially located in the receiving cavity 50A, and the screw guide 612 is in sliding guiding fit or clearance fit with the side wall portion 512 so as to keep the coaxiality of the screw, the valve needle and the valve port, it should be noted that the screw guide 612 in the screw 61 may also be configured to have a structure with an outer diameter equal to that of the transition portion 613 or the like, or the screw guide 612 is not provided in the screw 61, so as to achieve the technical effects provided by the present application, the electronic expansion valve further includes the stopper structure 100, and the stopper structure 100 includes the first stopper 70 and the second stopper 80, in this embodiment, the first stopping portion includes a first stopping boss 70a, the second stopping portion includes a second stopping boss 80a, the first stopping boss 70a and the nut member 50 are integrally formed, the second stopping boss 80a and the lead screw are integrally formed, in this embodiment, the first stopping boss 70a is located at a position substantially below the nut screw portion 53, the first stopping boss 70a is closer to the valve port portion 11 than the nut screw portion 53, the first stopping boss 70a extends downward from the base end face 5111 in a direction close to the valve port portion 11, the first stopping boss 70a has a first stopping end face 71a, the first stopping boss 70a can have a trapezoidal, rectangular or irregular structure, and the like, so that the specific structure of the first stopping boss 70a is not limited, the second stopping boss 80a extends upward from the guide end face 6121 in a direction away from the valve port portion 11, the second stop boss 80a has a second stop end surface 81a, when the valve needle 70 abuts against the valve port portion 11, the second stop boss 80a is relatively far away from the first stop boss 70a and is located below the first stop boss 70a, and the second stop boss 80a is closer to the valve port portion 11 than the first stop boss 70 a; when the second stop end surface 81a abuts against the first stop end surface 71a, the valve needle 70 is relatively far away from the valve port 11, and at this time, the valve needle 70 is farthest away from the valve port 11, the first stop boss 70a abuts against the second stop boss 80a to form an upper stop position of the electronic expansion valve, and when the second stop end surface 81a abuts against the first stop end surface 71a, the magnetic rotor stops rotating, the screw rod valve needle assembly 60 cannot further move upwards in the axial direction, and the first stop boss 70a and the nut body 51 are formed into an integral structure through an integral injection molding mode; or when the nut member 50 is a metal member, the first stopper projection 70a and the nut member 50 are integrally formed, and may be integrally formed by powder sintering or the like; alternatively, the base portion and the side wall portion may be provided separately, and the first stopper projection 70a may be integrally formed with the side wall portion and then fixedly connected to the base portion 511, for example, the base portion 511 may be provided as a metal part, the first stopper projection 70a may be formed integrally with the side wall portion 512 by injection molding, and then insert-molded with the base portion 511 and the connecting portion 52 to form the nut member 50, or the first stopper projection 70a may be integrally formed with the side wall portion 512 by powder sintering and then fixedly connected to the base portion 511 by welding or the like; alternatively, the first stopper projection 70a may be integrally formed with the base portion 511 and then fixedly connected to the side wall portion 512, for example, the side wall portion may be formed as a metal part, the first stopper projection 70a and the base portion 511 are integrally formed by injection molding, and then insert-molded with the side wall portion 512 and the connecting portion 52 to form the nut member 50, or the first stopper projection 70a is integrally formed with the base portion 511 by powder sintering and then fixedly connected to the side wall portion 512 by welding or the like; or the nut body 51 is integrally formed as an insert molding structure, and includes a first nut body and a second nut body, the first nut body is relatively close to the center line of the nut component 50, the second nut body is relatively far from the center line of the nut component 50, the first stop boss 70a and the first nut body are integrally formed as a structure, the first nut body may be a plastic component, the second nut body is a metal component, or the first nut body is a metal component, and the second nut body is a plastic component, it should be noted that the statement that the first stop portion and the nut component are integrally formed in the electronic expansion valve provided in the present application is only to exemplify several embodiments, and for those skilled in the art, other ways to integrally form the first stop portion and the nut component as an integrally formed structure, such as appropriate improvement or decoration thereof, also belong to the protection scope of the present application, the second stopping boss 80a and the screw guide portion 613 can be formed integrally, and the second stopping boss 80a and the screw guide portion 613 can be formed in an integral injection molding manner and then the whole screw guide portion 613 and other parts of the screw 61 are fixedly connected; or the second stopping boss 80a may be integrally formed with the external thread portion 611 and then fixedly connected to the other portion of the screw rod 61, or the second stopping boss 80a may be integrally formed with the transition portion 613 and then fixedly connected to the other portion of the screw rod 61, for example, the second stopping boss 80a may be integrally formed with the external thread portion 611 near the transition portion 613 by powder sintering and then fixedly connected to the screw rod guide portion 612 by welding, insert molding, or the second stopping boss 80a may be integrally injection molded with the external thread portion 611 and then fixedly connected to the screw rod guide portion 613 by welding, insert molding, or the like; alternatively, the second stop boss 80a is directly formed integrally with the screw 61, for example, by powder sintering. It should be noted that the screw valve needle assembly 60 described in the present application may be a structure in which the screw and the valve needle are respectively disposed and then connected by adding an intermediate member, or may be an integrally formed structure, and the screw 61 refers to a screw member integrally formed by lathing or the like, and also includes a screw assembly formed by respectively machining and assembling a plurality of components. Wherein the second stop boss 80A is set to have an abutting position A1 when abutting against the first stop boss 70A, the nut member 50 has a highest end surface position 50B and a lowest end surface position 50C, the abutting position A1 is set between the highest end surface position 50B and the lowest end surface position 50C, in the present embodiment, the abutting position A1 is located in the accommodating chamber 50A, the operation principle of the electronic expansion valve is briefly described below, the rotor rotates by the excitation of the coil, the screw rod 61 rotates synchronously therewith, the screw rod 61 and the valve needle 62 move axially and downwardly by the screw thread matching action of the screw thread portion 611 and the nut thread portion 53, the screw rod 61 and the valve needle 62 gradually approach the valve port 110, the second stop boss 80A gradually separates from the first stop boss 70A, when the valve needle 62 abuts against the valve port 11, the second stop boss 80A relatively separates from the first stop boss 70A farthest away, when the rotor rotates reversely and the screw rod 61 rotates synchronously and moves axially upwards, the valve needle 62 is gradually far away from the valve port 11, the second stop boss 80a is gradually close to the first stop boss 70a, when the second stop boss 80a abuts against the first stop boss 70a, an upper stop position of the electronic expansion valve is formed, the rotor stops rotating the screw rod and the valve needle cannot move axially upwards further.

Through the structure arrangement, the first stop part and the nut component can be of an integrated structure, the second stop part and the screw rod can be of an integrated structure, the first stop part and the second stop part abut against each other to realize the upper stop position of the electronic expansion valve, the stop structure of the electronic expansion valve comprises fewer parts, the integral structure is simplified, in addition, the processing mode of the first stop part and the second stop part of the stop structure is more convenient and more convenient to realize and is not limited by the material and the processing mode of the part, the abutting position when the first stop part and the second stop part abut against each other is always positioned between the highest end surface position 50B and the lowest end surface position 50C of the nut component 50, the internal space of the nut component 50 is fully and effectively utilized for arranging the stop structure, and the additional occupation of the space between the outer peripheral part of the nut component 50 and the rotor is relatively avoided to arrange the stop structure, the electronic expansion valve provided by the application can relatively improve the noise problem generated when the electronic expansion valve stops operating compared with the stop structure of the electronic expansion valve in the background art, the stop position A1 is positioned in the accommodating cavity 50A, the nut component 50 approximately covers the stop position A1, the external noise is isolated by the nut component 50, and the noise when the electronic expansion valve stops operating can be relatively improved, in addition, in the stop structure in the background art, because the sliding ring has a certain elastic action, the amplitude generated by the sliding ring is larger when the sliding ring abuts against the stop component, and the larger impact noise is easily generated when the sliding ring abuts against the stop component, while the first stop part and the nut component of the stop structure provided by the application are of an integrated structure, and the second stop part and the screw rod are of an integrated structure, the impact noise generated when the first stop part is abutted against the second stop part is small, and the stop noise problem of the electronic expansion valve can be relatively improved.

The second embodiment of the electronic expansion valve provided by the present application is described below, and is different from the first embodiment in the arrangement positions of the first stopping protrusion 70a and the second stopping protrusion 80a, in this embodiment, the first stopping protrusion 70a is substantially protruded from the inner peripheral wall of the side wall 512 in the radial direction close to the central axis direction of the screw rod 61, the first stopping protrusion 70a and the nut body 51 are integrally formed, the second stopping protrusion 80a and the screw rod 61 are integrally formed, and the second stopping protrusion 80a is substantially protruded from the transition portion 613 in the radial direction close to the central axis direction of the screw rod 61.

Referring to fig. 6-11, a third embodiment of the present invention will be described, which is different from the first two embodiments in the structure of the first and second stopping portions, in which the first stopping portion 70 includes a stopping pin 70b, the second stopping portion 80 includes a stopping engaging member 80b, the side wall portion 512 has a first through hole 5121, the first through hole 5121 extends through the inner peripheral wall and the outer peripheral wall of the side wall portion 512, the first through hole 5121 has a first central line S1, the first central line S1 extends in the direction relatively close to the central axis of the nut member 50, the stopping pin 70b includes a stopping body portion 711b and a surrounding portion 712b, the stopping body portion 711b substantially extends from the surrounding portion 712b to protrude in the direction close to the central axis of the nut member 50, the stopping body portion 711b of the stopping pin 70b extends through the first through hole 5121, and the stopping body portion 711b is closely matched with the side wall portion 512 in a clearance manner, the surrounding portion 712b is substantially matched with the sidewall portion 512 of the nut body 51 and tightly embraces the outer periphery of the sidewall portion 512 to abut against the sidewall portion 512, so as to realize the limit connection between the stop pin 70b and the nut member 50, in this embodiment, the whole stop pin 70b can be substantially located below the nut thread portion 53, it should be noted that the surrounding portion 712b can also be provided with an overall annular structure, so as to better embrace the nut member 50, or the surrounding portion 712b can only be provided with a semi-circular structure capable of embracing the nut member 50 to abut against the semi-circular structure.

Or, when the nut component 50 is molded by injection molding, the stop pin 70b and the nut body 51 are fixedly connected to form insert molding of the stop pin 70b and the nut component 50 through an injection molding process, so that the stop pin 70b and the nut component 50 are integrated; alternatively, when the nut member 50 is a metal member, the stopper body 711b of the stopper pin 70b and the side wall 512 can be tightly fitted in the first through hole 5121 by press fitting to fixedly connect the stopper pin 70b and the nut member 50, or the stopper pin 70b and the side wall 512 can be fixedly connected by welding or the like to fixedly connect the stopper pin 70b and the nut member 50. It should be noted that what is stated in the present application is only an exemplary embodiment of the fixed or limit connection of the stop pin 70b to the nut member 50, and it is actually impossible to exhaust the structural manner of the stop pin 70b, and those skilled in the art can also fall within the scope of the present application by making several improvements or modifications to the stop pin structure, the stop pin 70b has a stop pin side wall 71b, the stop engaging member 80b has a notch 811b and a locking groove 812b, and includes a base 81b and a locking projection 82b, the base 81b has a substantially plate-shaped structure with the notch 811b, the locking groove 812b is adapted to the transition portion 613 of the lead screw 61, the locking projection 82b extends upward from the base 81b in a direction away from the valve opening portion 11, the locking projection 82b includes a locking projection connecting portion, a locking projection transition portion and a locking projection flange portion, the locking projection transition portion is located between the locking projection connecting portion and the locking flange portion, the flange part of the locking projection extends upwards axially to form a projection, the locking projection 82b and the base 81b are integrated or fixedly connected, the locking clamping piece 80b and the screw rod 61 are in limit connection through the clamping limit of the clamping groove 812b and the transition part 613 of the screw rod 61, or the locking clamping piece 80b and the screw rod 61 are welded and then welded and fixed with the guide end face 6121 of the screw rod guide part 612 to realize the fixed connection of the two, the rotor rotates under the action of coil excitation, the screw rod 61 rotates synchronously along with the rotor, the screw rod 61 and the valve needle 62 can move downwards axially through the thread matching action of the screw rod thread part 611 and the nut thread part 53, the valve needle is gradually close to the valve port 110, when the valve needle 62 abuts against the valve port 11, the locking clamping piece 80b is positioned below the stop pin 70b and relatively far away from the stop pin 70b, when the rotor rotates reversely, the synchronous rotation of the screw rod 61 moves upwards axially, the screw rod and the valve needle move axially upward, the valve needle 62 gradually moves away from the valve port 11, the stop fastener 80B gradually approaches the stop pin 70B, when the stop fastener 80B abuts against the stop pin sidewall 71B of the stop pin 70B, an upper stop position of the electronic expansion valve is formed, the rotor stops rotating, the screw rod and the valve needle cannot further move axially upward, when the stop fastener 80B abuts against the stop pin 70B, the stop fastener 80B has an abutment position a1, the abutment position a1 is located between the highest end surface position 50B and the lowest end surface position 50C of the nut member 50, specifically, in this embodiment, the abutment position a1 is located in the accommodating cavity 50A, the first stop portion of the stop structure is fixedly connected or in a limiting manner with the nut member, the second stop portion is fixedly connected or in a limiting manner with the screw rod, the stop structure includes fewer parts, and the overall structure is simplified, in addition, the first stopper portion and the second stopper portion of the stopper structure can be more easily processed without being limited by the material of the component and the processing method, the stopper structure can be provided by making full use of the internal space of the nut member 50 when the abutment position a1 at which the stopper engaging piece 80B abuts against the stopper pin 70B is located between the highest end surface position 50B and the lowest end surface position 50C of the nut member 50, the miniaturization of the nut member and the miniaturization design of the electronic expansion valve product can be realized, the abutment position a1 is always located in the nut member 50, and the stopper noise problem can be relatively improved by further isolating the external noise by the nut member 50.

Referring to fig. 12 to 14, a fourth embodiment of the present invention will be described, which is different from the third embodiment in the structure of the stop pin, in this embodiment, the first stop portion 70 includes a stop pin 70b ', the second stop portion 80 includes a stop engaging member 80b, the side wall portion 512 is provided with a second through hole 5122, the second through hole 5122 penetrates through the inner circumferential wall and the outer circumferential wall of the side wall portion 512, the second through hole 5122 has a second center line S2, the second center line S2 extends in the direction relatively away from the central axis of the nut member 50, the stop pin 70b' includes a stop body portion 711b 'and a surrounding portion 712b', the stop body portion 711b 'substantially protrudes from the surrounding portion 712b' in the direction away from the central axis of the nut member 50, the stop body portion 711b 'penetrates through the second through hole 5122, the stop body portion 711b' is closely fitted to the side wall portion 512 with a clearance, the surrounding portion 712b 'fits into the side wall portion 512 and tightly grips the outer peripheral portion of the side wall portion 512 to abut against it, thereby achieving the position-limiting connection between the stop pin 70b' and the nut member 50.

Or, when the nut component 50 is molded by injection molding, the stop pin 70b ' and the nut body 51 are insert molded by the injection molding process to realize the fixed connection of the stop pin 70b ' and the nut component 50, so that the stop pin 70b ' and the nut component 50 are integrated; alternatively, when the nut member 50 is a metal member, the stopper body 711b ' of the stopper pin 70b ' and the side wall 512 may be press-fitted and tightly fitted in the second through hole to fixedly connect the stopper pin 70b ' and the nut member 50, or the stopper pin 70b ' and the side wall 512 are welded to fixedly connect the stopper pin 70b ' and the nut member 50. The stop pin 70b ' has a stop pin end surface 72b ', and the locking protrusion 82b of the locking engaging member 80b can abut against the stop pin end surface 72b ', and the specific structure, operation principle and technical effect of the related components are specifically described in the third embodiment, and are not described in detail herein.

The fifth embodiment provided by the present application is described with reference to fig. 15 to 18, and is different from the first four embodiments in that the setting position and the abutting position of the first stopper are changed, the electronic expansion valve has an accommodating groove 50D, the accommodating groove 50D is substantially axially recessed from the base 511 in a direction away from the valve port 11, the accommodating groove 50D has a groove bottom wall 51D, the base 511 is provided with a third through hole 5123, the third through hole 5123 has a third center line S3, the third center line S3 is substantially parallel to the central axis of the screw rod, the first stopper in this embodiment includes a stopper pin 70C, the stopper pin 70C passes through the third through hole 5123, specifically, the stopper pin 70C includes a stopper body portion 71C, a hook 72C and an engaging portion 73C, the engaging portion 73C connects the stopper body portion 71C and the hook 72C, the stopper portion 71C passes through the third through hole 5123, the stopper body 71C extends axially downward toward the valve port 11, the outer periphery of the base 511 is provided with a groove 50E, the groove 50E is recessed from the outer surface of the outer periphery of the base 511 toward the central axis of the nut member 50, the hook 72C is engaged and abutted with the groove 50E, when the stopper 70C is mounted, the stopper body 71C may be inserted into the accommodating groove 50D through the third through hole 5123, and the portion of the stopper 70C exposed to the upper end surface of the base 511 is deformed to form the engaging portion 73C and the hook 72C, so that the hook 72C is engaged and fitted into the groove 50E, and the engaging portion 73C is abutted with the upper end surface of the base 511, thereby realizing the limit connection between the stopper 70C and the nut member 50.

Or, when the nut member 50 is injection molded, the stop pin 70C and the nut member 51 may be fixedly connected by insert molding the stop pin 70C and the nut member 50 through an injection molding process, so that the stop pin 70C and the nut member 50 are formed into an integral structure; or, when the nut member 50 is a metal piece, the stopper body portion 71C of the stopper pin 70C and the base portion may be tightly fitted by press-fitting to realize the fixed connection of the stopper pin 70C and the nut member 50; or the stop pin 70C and the base 511 are fixedly connected to the nut member 50 by welding, etc., it should be noted that the description of the present application only exemplifies several embodiments of the stop pin 70C and the nut member 50, and it is practically impossible to exhaust the structural manner of the stop pin 70C, and compared with other embodiments, the stop pin 70C in the present embodiment may be relatively located above the threaded portion of the nut or flush with the threaded portion of the nut, the second stop portion includes a stop engaging member 80C, the stop engaging member 80C is fixedly connected or connected to the lead screw, the stop engaging member 80C has a catching protrusion 82C, the catching protrusion 82C can abut against the stop pin 70C, when the valve needle abuts against the valve mouth portion, the stop engaging member 80C is relatively far away from the stop pin 70C, when the stop engaging member 80C abuts against the stop pin 70C, when the valve needle is relatively far away from the valve port portion, the stop engaging piece 80C abuts against the stop pin 70C to form an abutting position a1, the abutting position a1 is located between the highest end surface position 50B and the lowest end surface position 50C, in this embodiment, the abutting position a1 is located in the accommodating groove 50D, it is to be noted that the accommodating groove 50D may be extended upward continuously, or a through hole and a stop pin or a first stop boss may be provided near the lowest end surface 50C of the valve body member 10 according to a stroke or other setting requirements, but the abutting position a1 of the first stop portion and the second stop portion is always located between the highest end surface position 50B and the lowest end surface position 50C of the nut member 50, and related operation principles and technical effects are specifically stated in other embodiments and are not repeated herein.

Briefly describing the sixth embodiment, different from the first five embodiments, the stop structure is changed from the stop manner of the circumferential position between the first stop portion and the second stop portion to the stop manner of the axial position between the first stop portion and the second stop portion, in this embodiment, the stop structure of the electronic expansion valve includes an end surface of the nut member 50 and an end surface of the lead screw 61, the two end surfaces directly or indirectly abut against each other to form the upper stop position of the electronic expansion valve, specifically, the first stop portion includes a base end surface 5111, the second stop portion includes a guide end surface 6121, when the valve needle 62 abuts against the valve port 11, the guide end surface 6121 is relatively far away from the base end surface 5111, when the guide end surface 6121 abuts against the base end surface 5111, the guide end surface 6121 is relatively far away from the valve port 11, and when the guide end surface 6121 abuts against the base end surface 5111, the abutment position a1 is formed, the abutting position a1 is located between the highest end surface 50B and the lowest end surface 50C, the guiding end surface 6121 abuts against the base end surface 5111 to form an upper stop position of the electronic expansion valve, and the magnetic rotor and the lead screw 61 are prevented from further moving axially upwards to limit the position of the magnetic rotor and the lead screw, the stop structure is relatively convenient to arrange, no additional component is needed to arrange to realize the stop, the stop can be realized by abutting the end surface of the nut member against the end surface of the lead screw member directly, the guiding end surface 6121 abuts against the base end surface 5111 directly, and there may be a large friction force between the two, but as long as the driving force of the electronic expansion valve is enough to realize the corresponding stop requirement, it should be noted that in this embodiment, the base end surface 5111 and the nut member 50 are integrally formed, in other embodiments, for example, a nut mating part may be separately arranged, the nut mating part includes the base end surface 5111, the nut matching part is fixedly connected or limited with the nut component 50, the guide end face 6121 and the lead screw are in an integrally formed structure in the embodiment, in other embodiments, the lead screw matching part can be independently arranged and provided with the guide end face 6121, and the lead screw matching part is fixedly connected or limited with the lead screw, so that the technical effect to be achieved by the application can be achieved as well; or the first stopping part is a base end face 5111, the second stopping part is a stopping clamping piece 80b, and when the screw rod moves upwards in the axial direction, the clamping protrusion 82b of the stopping clamping piece 80b can abut against the base end face 5111 to form an upper stopping position of the electronic expansion valve; or the first stopping part is a first stopping boss 70a, the second stopping part is a guiding end face 6121, when the screw rod moves axially upward, the guiding end face 6121 can abut against the first stopping boss 70a to form an upper stopping position of the electronic expansion valve, it should be noted that several embodiments of the stopping structure 100 at the axial position are merely exemplified in this embodiment, and it is obvious to those skilled in the art that several improvements or decorations on the corresponding structure are also within the protection scope of the present application.

The application provides an electronic expansion valve, including valve body part 10, nut part 50, feed screw valve needle assembly 60, valve body part 10 includes valve port 11, valve port 11 has valve port 110, nut part 50 is fixedly connected with valve body part 10, feed screw valve needle assembly 60 includes feed screw 61 and valve needle 62, feed screw 61 includes feed screw thread portion 611, nut part 50 includes nut thread portion 53, feed screw thread portion 611 and nut thread portion 53 are screw-engaged, valve needle 62 can be close to or keep away from valve port 110 of valve port 11 by screw-engaged action in order to regulate the coolant flow through the valve port, electronic expansion valve also includes stop structure 100, stop structure includes first stop part 70 and second stop part 80, first stop part 70 and nut part 50 are the integrated into one piece structure, or first stop part 70 and nut part 50 are fixedly connected or spacing connection, second stop part 80 and feed screw 61 are the integrated into one piece structure, or the second stopping part 80 is fixedly connected or in a limiting way with the screw rod 61, and the first stopping part can be abutted against the second stopping part.

It should be noted that the ordinal numbers of "first" and "second" and the directional terms of "upper" and "lower" are set forth in the specification and drawings, respectively, and are not intended to limit the structure or sequence of the components.

The present invention has been described in terms of specific embodiments, which are merely illustrative of the principles and concepts that can be employed to facilitate an understanding 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.