CN-121993607-A - Electric valve and assembling method thereof

Abstract

The invention discloses an electric valve and an assembling method thereof, wherein the electric valve comprises a screw rod, a valve rod and a connecting structure, the valve rod is of an integrated structure, the valve rod comprises a first cylindrical part, a part of the screw rod is positioned in the first cylindrical part, the connecting structure is at least partially positioned in the first cylindrical part, the connecting structure is connected with the valve rod and the screw rod, the screw rod can rotate relative to the valve rod, and the screw rod can drive the valve rod to axially displace. In the scheme, the valve rod is of an integrated structure, the valve rod can be directly manufactured and formed without secondary assembly, and the forming preparation of the valve rod can be relatively simple, so that the assembly process of the electric valve provided by the embodiment of the invention is facilitated to be simplified. And the valve rod of integral type structure does not basically have the poor problem of axiality, still is favorable to guaranteeing the displacement smoothness of valve rod.

Inventors

• Request for anonymity
• Request for anonymity
• Request for anonymity

Assignees

• 浙江三花商用制冷有限公司

Dates

Publication Date

20260508

Application Date

20241101

Claims (12)

1. 1. The utility model provides an electric valve, its characterized in that includes lead screw, valve rod and connection structure, the valve rod is integrated into one piece structure, the valve rod includes first tube-shape portion, the part of lead screw is located in the first tube-shape portion, connection structure is at least partly located in the first tube-shape portion, connection structure connects the valve rod with the lead screw, the lead screw can for the valve rod rotates, the lead screw can drive the valve rod axial displacement.
2. 2. The electric valve according to claim 1, wherein the connection structure includes a rolling bearing and an axial fixing member, the rolling bearing includes an inner ring portion and an outer ring portion, the inner ring portion and the screw are fixedly connected or circumferentially limitedly connected, the outer ring portion is capable of abutting against the axial fixing member, and the axial fixing member is connected with the first cylindrical portion.
3. 3. The electrically operated valve according to claim 2, wherein the axial fixing member includes a seat portion, an elastic member, and a connecting portion, the seat portion being capable of abutting against the outer ring portion, the connecting portion being fixedly connected to the first cylindrical portion, one end of the elastic member being abutted directly or indirectly against the seat portion, and the other end of the elastic member being abutted directly or indirectly against the connecting portion.
4. 4. A valve according to claim 3, wherein the seat portion has a second bore comprising a second large neck bore section and a second small neck bore section, the second large neck bore section and the second small neck bore section being arranged in the axial direction of the valve stem, the rolling bearing being located in the second large neck bore section, the depth H1 of the second large neck bore section being greater than the axial dimension H2 of the rolling bearing, the difference between the depth H1 and the axial dimension H2 being between 0.05mm and 0.3 mm.
5. 5. The electrically operated valve of claim 3 wherein said axially stationary member further comprises a filter element comprising a filter housing and a mounting portion, said filter housing comprising a second cylindrical portion, an end bottom portion and a wing portion connected, said end bottom portion and said wing portion being located at respective axial ends of said second cylindrical portion, said end bottom portion being located radially inward of said second cylindrical portion, said wing portion being located radially outward of said second cylindrical portion, said mounting portion being connected to said wing portion, said mounting portion being located between said elastic member and said connecting portion.
6. 6. The electrically operated valve of claim 3 wherein said connecting portion includes a tight fit section, said first cylindrical portion includes an interference connecting section, said tight fit section and said interference connecting section are interference fit, and an outer wall surface of said interference connecting section is provided with a notch groove.
7. 7. The electrically operated valve of claim 6 wherein said first cylindrical portion includes a third stepped surface facing downwardly, said connecting portion contacting said third stepped surface, said notch groove having a radial dimension D of between 0.05mm and 0.4 mm.
8. 8. The electrically operated valve of claim 3 wherein said connecting portion has a first bore including a first large neck bore section and a first small neck bore section, said first large neck bore section and said first small neck bore section being axially distributed along said valve stem, said connecting portion defining a first stepped surface between said first large neck bore section and said first small neck bore section.
9. 9. The electrically operated valve of any one of claims 1-8, wherein the valve stem further comprises an end plate portion at an axial end of the first cylindrical portion, the end plate portion having a through hole, the lead screw being inserted into the through hole.
10. 10. The electrically operated valve of claim 9 further comprising a nut having a third bore, the third bore comprising a threaded section and a receiving section, the receiving section having an inner diameter greater than the threaded section, a portion of the lead screw being threadably connected to the threaded section; The first cylindrical part comprises a small-diameter section, a part of the small-diameter section stretches into the accommodating section, the small-diameter section is connected with the end plate part, a part of the connecting structure is positioned in the small-diameter section, the small-diameter section is further provided with an opening, and the opening is communicated with the inside and the outside of the small-diameter section.
11. 11. An assembly method of an electric valve is characterized in that the electric valve comprises a screw rod, a valve rod and a connecting structure, the valve rod is of an integrated structure, the valve rod comprises a first cylindrical part, and the assembly method at least comprises the following steps: inserting the lead screw portion into the first cylindrical portion; the connecting structure is arranged in the first cylindrical part to connect the screw rod and the first cylindrical part, so that the screw rod can rotate relative to the valve rod, and the screw rod can drive the valve rod to axially displace.
12. 12. The method of assembling an electrically operated valve according to claim 11, wherein the connecting structure includes a rolling bearing, a housing portion, an elastic member, a filter member, and a connecting portion, and the fitting the connecting structure into the first cylindrical portion includes: the inner ring part of the rolling bearing is arranged at the part of the screw rod extending into the first cylindrical part; Install pedestal portion the elastic component the filter element with connecting portion makes pedestal portion with antifriction bearing's outer lane portion looks butt, the elastic component is located pedestal portion with filter element between, filter element is located the elastic component with between the connecting portion, connecting portion with first tube-shape portion welded fastening, or interference pressure equipment is fixed.

Description

Electric valve and assembling method thereof Technical Field The invention relates to the technical field of valves for refrigeration systems, in particular to an electric valve and an assembly method thereof. Background The electric valve comprises a screw rod and a valve rod, the screw rod is connected with the valve rod, and the screw rod can drive the valve rod to displace, so that the valve opening and closing can be realized. In the related art, the valve rod has more parts, the assembly process is relatively complex, and the coaxiality of the valve rod is easy to be degraded, so that the normal displacement of the valve rod in the electric valve is influenced. Therefore, how to provide a solution to overcome or alleviate the above-mentioned drawbacks is still a technical problem to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide an electric valve and an assembly method thereof, wherein a valve rod of the electric valve is of an integrated structure, so that the electric valve is convenient to prepare and has good coaxiality. In order to solve the technical problems, the invention provides an electric valve, which comprises a screw rod, a valve rod and a connecting structure, wherein the valve rod is of an integrated structure, the valve rod comprises a first cylindrical part, a part of the screw rod is positioned in the first cylindrical part, the connecting structure is at least partially positioned in the first cylindrical part, the connecting structure is connected with the valve rod and the screw rod, the screw rod can rotate relative to the valve rod, and the screw rod can drive the valve rod to axially displace. In the scheme, the valve rod is of an integrated structure, and the coaxiality of the valve rod of the integrated structure is easy to ensure. Optionally, the connection structure includes antifriction bearing and axial fixed part, antifriction bearing includes inner circle portion and outer lane portion, inner circle portion with lead screw fixed connection or circumference spacing connection, outer lane portion can with axial fixed part looks butt, axial fixed part with first tube-shape portion links to each other. Optionally, the axial fixing component includes pedestal portion, elastic component and connecting portion, the pedestal portion can with outer lane portion looks butt, connecting portion with first tube-shape portion fixed connection, the one end of elastic component directly or indirectly with pedestal portion looks butt, the other end of elastic component directly or indirectly with connecting portion looks butt. Optionally, the seat body has a second inner bore comprising a second large neck bore section and a second small neck bore section, the second large neck bore section and the second small neck bore section being arranged axially along the valve stem, the rolling bearing being located in the second large neck bore section, the depth H1 of the second large neck bore section being greater than the axial dimension H2 of the rolling bearing, the difference between the depth H1 and the axial dimension H2 being between 0.05mm and 0.3 mm. Optionally, the axial fixing component further includes a filter component, the filter component includes a filter housing and a mounting portion, the filter housing includes a second tubular portion, an end bottom portion and a wing plate portion that are connected, the end bottom portion and the wing plate portion are respectively located at two axial ends of the second tubular portion, the end bottom portion is located at a radial inner side of the second tubular portion, the wing plate portion is located at a radial outer side of the second tubular portion, the mounting portion is connected to the wing plate portion, and the mounting portion is located between the elastic member and the connecting portion. Optionally, the connecting portion includes the tight fit section, first tube-shape portion includes interference connecting section, the tight fit section with interference connecting section interference fit, the outer wall surface of interference connecting section is provided with the breach groove. Optionally, the first cylindrical portion includes a third step surface facing downward, the connecting portion is in contact with the third step surface, and a radial dimension D of the notch groove is between 0.05mm and 0.4 mm. Optionally, the connecting portion has a first inner bore, the first inner bore includes a first large neck bore section and a first small neck bore section, the first large neck bore section and the first small neck bore section are distributed along an axial direction of the valve rod, and a first step surface is formed between the first large neck bore section and the first small neck bore section by the connecting portion. Optionally, the valve rod further comprises an end plate portion, the end plate portion is located at one axial end of the first cylindr