WO2012048581A1

WO2012048581A1 - Electric valve

Info

Publication number: WO2012048581A1
Application number: PCT/CN2011/075863
Authority: WO
Inventors: 魏先让
Original assignee: 浙江三花股份有限公司
Priority date: 2010-10-15
Filing date: 2011-06-17
Publication date: 2012-04-19
Also published as: CN103249977A; JP2012533717A; CN103249977B; CN102454818A; JP5510685B2; KR101375377B1; KR20120066032A

Abstract

An electric valve for regulating fluid flow includes a valve seat assembly, a nut assembly and a valve needle screw assembly. The valve seat assembly includes a valve seat (12) and a valve core seat (11), and the nut assembly includes a nut (32) for installing said valve needle screw assembly. The lower end of the nut (32) is sleeved with the upper end of the valve core seat (11). The electric valve has high coaxality between the valve needle and the valve core seat, can avoid the problem of eccentric wear, and obviously reduces the friction force when the rotor rotates.

Description

An electric valve is claimed in the Chinese Patent Application No. 201010515234.1, the entire disclosure of which is incorporated herein by reference. in.

Technical field

The present invention relates to the field of control valves, and more particularly to an electric valve for regulating fluid flow.

Background technique

In air conditioners, refrigerators, heat pump water heaters, and various types of refrigeration and heating equipment, electric valves are often used to regulate the flow of fluid.

The electric valve usually includes a valve seat assembly, a nut assembly, a needle screw assembly, and a rotor assembly. The valve seat assembly generally includes a valve seat, a valve seat and a connecting tube, and the valve seat has a valve port, a valve seat, a valve seat and a connection. The tubes are typically welded together to form a wide seat assembly, and the wide needles of the wide needle screw assembly are mounted within the nut of the nut assembly.

An electric valve is disclosed in the patent document (Japanese Laid-Open Patent Publication No. 2010-25932). The nut of the nut assembly is fixed in the guide sleeve, and the guide sleeve is fixed on the valve seat, and the valve needle needs to be fixed in the valve port of the valve seat. Therefore, the coaxiality of the valve seat and the nut is relatively high. The above-mentioned electric valve needs to be indirectly controlled through multiple assembly processes to ensure the coaxiality of the valve core seat and the nut, and the coaxiality of the valve seat and the nut is guided by the nut. The influence of the machining accuracy of the sleeve, valve seat, valve needle and other parts, the coaxiality is not easy to guarantee. If the spool seat and the nut are different shafts, the valve shaft and the valve port are different from each other, which causes the valve to be different. The problem of the mouth seal is not strict or the valve port is eccentrically worn, so that the reliability of the action of the electric valve is low, and the service life of the electric valve is also short.

In addition, the replacement of metal materials with plastic materials has become a development trend in the field. In the above electric valve, if the nut is made of plastic material, the nut and the guide sleeve are not easily ensured by the interference fit, and the connection strength is not ensured. The lower the nut, the nut can not be made of plastic material, still have to use expensive metal material, so that the processing cost of the electric valve is higher.

Therefore, how to develop an electric valve with a high coaxiality between the nut and the valve core seat has become a technical problem to be solved by those skilled in the art. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric valve having a high coaxiality of a nut and a spool seat.

In order to achieve the above object, the present invention provides an electric valve including a valve seat assembly, a nut assembly, a wide needle screw assembly, the wide seat assembly including a wide seat, a wide core seat, and the nut assembly including a mounting base The nut of the wide needle screw assembly is characterized in that the lower end of the nut is fitted with the upper end of the valve core seat.

Preferably, the upper end of the valve core seat is inserted into the inner hole of the lower end of the nut, and the valve core seat is sleeved with the nut in a clearance fit, a transition fit or an interference fit.

Preferably, the lower end of the nut is inserted into the inner hole of the upper end of the valve core seat, and the nut is sleeved with the valve core seat in a clearance fit, a transition fit or an interference fit.

Preferably, the nut comprises a plastic nut and an annular metal connecting piece, and the plastic nut is injection molded by engineering plastic on the basis of the annular metal connecting piece.

Preferably, the outer side of the annular metal connecting piece is welded and fixed to the valve seat.

Preferably, the outer side of the annular metal connecting piece is provided with not less than one outer notch. Preferably, the inner side of the annular metal connecting piece is provided with not less than one inner side notch; and the annular connecting piece has at least one through hole on the annular portion.

Preferably, the wide needle screw assembly includes a wide needle with a wide needle sleeve at one end, and a screw rod; the valve needle is disposed in a through hole of the valve core seat, and one end of the valve needle is inserted into the valve The valve end of the seat is provided with a valve needle inner hole at one end, and one end of the screw rod is inserted into the inner hole of the valve needle through a retaining ring.

Preferably, a spring is disposed in the inner hole of the valve needle, and an end of the lead screw abuts against the spring. Preferably, the upper end of the nut is provided with an inner hole for mounting the screw rod, the upper end of the inner hole is a guiding hole, and the lower end of the inner hole is a threaded hole, and the threaded hole is external to the screw rod The threads form the drive thread pair.

The electric valve provided by the invention is used for installing the nut of the valve needle screw assembly, and the lower end thereof is connected with the upper end of the valve core seat in a set manner, so that the coaxiality of the nut and the valve port of the valve core seat is easily ensured. In addition, the coaxiality between the valve needle and the valve core seat is high, and the problem that the valve port is not tightly sealed or the valve port is eccentrically worn can be avoided; meanwhile, since the coaxiality of the valve needle and the valve port is improved, the rotor assembly is improved. The friction of the rotor will be significantly reduced, and the reliability of the electric valve will also be improved. High.

In a preferred embodiment, the nut comprises a plastic nut and an annular metal connecting piece, and the plastic nut is injection molded by engineering plastic on the basis of the annular metal connecting piece. The nut is injection-molded together with a ring-shaped metal connecting piece. The main body of the nut is injection-molded by engineering plastics. While ensuring the strength of the connection between the nut and the valve seat, the nut has a single process, high production efficiency and low cost. DRAWINGS

Figure 1 is a cross-sectional structural view showing a specific embodiment of an electric valve according to the present invention;

Figure 2 is a schematic structural view of the nut of Figure 1;

Figure 3 is a schematic structural view of the annular metal connecting piece of Figure 2;

Figure 4 is a schematic view showing the structure of the electric valve of Figure 1 when the outer casing is not installed;

Figure 5 is a cross-sectional structural view showing another embodiment of the electric valve according to the present invention;

Among them, Figure 1 - Figure 5:

Spool seat 11, valve seat 12, first connecting tube 13, second connecting tube 14, valve needle 21, valve sleeve 22, lead screw 23, retaining ring 24, spring 25, annular metal connecting piece 31, inner edge notch 31-1, communication hole 31-2, outer notch 31-3, plastic nut 32, plastic nut upper portion 32-1, plastic nut middle portion 32-2, plastic nut lower portion 32-3, spring guide 33, slip ring 34, rotor 41. Rotor stop portion 42 and outer casing 5.

detailed description

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 to FIG. 4, FIG. 1 is a cross-sectional structural view showing a specific embodiment of an electric valve according to the present invention; FIG. 2 is a schematic structural view of the nut of FIG. 1; FIG. 4 is a schematic structural view of the electric valve of FIG. 1 when the outer casing is not installed.

As shown in Figure 1, the present invention provides an electric valve that includes a valve seat assembly, a nut assembly, a valve stem wire assembly, and a rotor assembly.

Wherein, the valve seat assembly includes a spool seat 11, a valve seat 12, a first connecting tube 13, and a second connection The tube 14, the valve core seat 11, the valve seat 12, the first connecting tube 13, and the second connecting tube 14 are integrally connected to form a valve seat assembly, a valve core seat 11, a valve seat 12, a first connecting tube 13, and a second connecting tube 14 can be joined together by welding, or it can be integrally formed.

The nut assembly includes a nut for mounting a wide needle screw assembly, and an outer circumference of the upper portion of the nut is provided with a spring rail 33 and a retaining slip ring 34. The lower end of the nut is fitted with the upper end of the valve core seat 11, and the side of the nut is The valve seat 12 is fixed. In a specific embodiment, as shown in FIG. 1, the upper end of the valve core seat 11 is inserted into the inner hole of the lower end of the nut, and the valve core seat 11 and the nut are matched with each other by a clearance fit. Or a suit of interference fit. .

The wide needle screw assembly may include a wide needle 21, a wide needle sleeve 22, a screw rod 23, a retaining ring 24, and a spring 25. The valve needle 21 and the valve needle sleeve 22 are integrally connected, and the valve needle 21 and the valve needle sleeve 22 are specifically It can be connected by welding, interference and pressure fitting, etc. The head of the screw rod 23 is provided with a retaining ring 24, and the retaining ring 24 can be set with the screw rod 23 by welding, interference fit, etc., and the screw rod 23 is fitted. In the inner bore of the valve needle 21, a spring 25 is also provided in the inner bore of the valve needle 21, and the end of the lead screw 23 can abut against the spring 25.

The rotor assembly includes a rotor 41, a rotor stopper 42 and a joint connecting the two, and the rotor assembly is fixed to the upper end of the screw shaft 23.

In a specific solution, the electric valve further includes a casing 5, and the casing 5 is fitted on the valve seat 12 for sealing the valve body.

The electric valve provided by the invention is used for installing a nut of a valve needle screw assembly, the lower end of which is connected with the upper end of the valve core seat 11 in a set manner, and the side of the nut is fixed to the valve seat 12 so that the nut and the valve core seat 11 are The coaxiality of the valve port is easily ensured, so that the coaxiality between the valve needle 21 and the valve core seat 11 is high, and the problem that the valve port is not tightly sealed or the valve port is eccentrically worn can be avoided; The coaxiality between the 21 and the valve port is improved, the frictional force of the rotor 41 of the rotor assembly is significantly reduced, and the operational reliability of the electric valve is also improved.

In the above embodiment, the wide needle screw assembly, the rotor assembly and the housing 5 are not related to the inventive point of the present invention, and the present invention does not specifically define the structure of the valve needle screw assembly, the rotor assembly and the housing 5, the valve needle wire The rod assembly, the rotor assembly and the housing 5 are of any other construction and are within the scope of the present invention.

In a preferred solution, as shown in FIG. 2 and FIG. 3, the nut includes a plastic nut 32 and a ring metal connection. The connecting piece 31, the annular metal connecting piece 31 has an annular shape and a specific through hole in the middle, and the annular metal connecting piece 31 can be stamped by a metal plate. The plastic nut 32 is injection molded by engineering plastic on the basis of the annular metal connecting piece 31. .

The nut adopts the annular metal connecting piece 31—the same as the injection molding. The main body of the nut is injection molded of engineering plastic. While ensuring the strength of the connection between the nut and the valve seat 12, the nut has a single process, high production efficiency and low cost.

In the specific solution, the outer side of the annular metal connecting piece 31 is welded and fixed to the valve seat 12, and the nut is fixedly connected to the valve seat 12 through the annular metal connecting piece 31, and the annular metal connecting piece 31 and the valve seat 12 can form a firm connection, which can ensure The strength of the connection between the nut and the valve seat 12.

In a preferred embodiment, the inner side of the annular metal connecting piece 31 is provided with not less than one inner edge gap.

31- 1 , a ring-shaped portion of the annular metal connecting piece 31 is provided with a plurality of connecting holes 31-2, and the inner side notch 31-1 and the connecting hole 31-2 can strengthen the upper and lower sides of the annular metal connecting piece 31 and the plastic nut The connection strength of 32 prevents the annular metal connecting piece 31 from rotating relative to the plastic nut 32.

In a preferred embodiment, the outer side of the annular metal connecting piece 31 is provided with not less than one outer notch 31-3, and the outer notch 31-3 can serve as a passage for the refrigerant to balance the pressure on the upper and lower sides of the connecting piece. In the solution, one of the outer notches 31-3 can be used to limit the tail of the spring 25 rail.

In the specific scheme, as shown in Fig. 3 and Fig. 4, the plastic nut 32 can be divided into the upper part of the plastic nut.

32-1, the middle of the plastic nut 32-2, the lower part of the plastic nut 32-3 three parts.

The outer circumference of the plastic nut upper portion 32-1 is a moving rail set portion for the set spring 25 rail and the retaining slip ring 34; the upper portion of the inner hole of the plastic nut upper portion 32-1 is a screw guide hole, and the lower portion of the inner hole is The threaded hole, the lead screw guiding hole cooperates with the outer circle of the upper end of the screw shaft 23 to provide a circumferential positioning guide for the rotor 41, and the internal thread hole and the external thread on the screw shaft 23 form a transmission thread pair. The outer diameter of the plastic nut middle portion 32-2 is larger than the outer diameter of the upper portion 32-1 of the plastic nut, and the annular metal connecting piece 31 is injection-molded to the middle portion 32-2 of the plastic nut. The plastic nut lower portion 32-3 is for forming a set with the upper end of the spool seat 11. Insert the valve stem screw assembly into the nut from the bottom of the nut, screw the wide needle screw assembly into the nut, and then fit the valve stem screw assembly and nut onto the valve core seat 11, and weld the ring. The edge of the metal connecting piece 31 is welded to the valve seat 12; the position of the stopping slip ring 34 and the rotor stopper 42 is set, the rotor assembly is set on the top of the screw rod 23, and the screw rod is welded 23 is welded to the connector on the rotor 41; finally, the outer casing 5 is fitted over the valve seat 12, and the outer casing 5 and the valve seat 12 are hermetically welded by welding.

In the above embodiment, the nut is formed by injection molding of the annular metal connecting piece 31 and the plastic nut 32. The electric valve provided by the present invention is not limited thereto, and the nut may also be a metal material nut as long as the nut and the valve core seat 11 are used. The structure fixed in a set manner should be within the scope of the present invention.

In the above embodiment, the nut and the valve core seat 11 are assembled in such a manner that the upper end of the valve core seat 11 is inserted into the inner hole of the lower end of the nut, and the two are assembled by a clearance fit, a transition fit or an interference fit. The invention is not limited thereto, and the lower end of the nut may be inserted into the inner hole of the upper end of the valve body seat 11, and the following embodiment is described in the following.

Referring to FIG. 5, FIG. 5 is a cross-sectional structural view showing another embodiment of the electric valve according to the present invention.

As shown in FIG. 5, the lower end of the nut is inserted into the inner hole of the upper end of the valve core seat 11, and the lower end of the nut and the upper end of the valve core seat 11 are formed by a clearance fit, a transition fit or an interference fit, and the remaining implementation process is The above embodiments are similar and will not be described in detail herein.

In the above embodiment, the lower end of the nut and the upper end of the valve core seat are assembled by a clearance fit, a transition fit or an interference fit. The present invention is not limited thereto, and the lower end of the nut and the upper end of the valve core seat may be screwed, etc. Mode suits are all within the scope of the present invention. The above description is only a description of a preferred embodiment of the invention. It should be noted that due to the finiteness of the textual expression, there is an infinitely specific structure objectively, and those skilled in the art will not deviate from the principles of the present invention. A number of improvements and retouchings may also be made, and such improvements and refinements are also considered to be within the scope of the present invention.

Claims

Rights request

CLAIMS 1. An electric wide, including a wide seat assembly, a nut assembly, a wide needle screw assembly, the valve seat assembly including a wide seat, a wide core seat, the nut assembly including a wide needle screw assembly for mounting a nut, wherein a lower end of the nut is fitted to an upper end of the wide core seat.

2 . The electric valve according to claim 1 , wherein an upper end of the valve core seat is inserted into an inner hole of a lower end of the nut, and the valve core seat and the nut are matched with a gap, a transition fit or The suit of the fit.

The electric valve according to claim 1, wherein a lower end of the nut is inserted into an inner hole of an upper end of the valve core seat, and the nut and the valve core seat are clearance-fitted, transition-fitted or over The suit of the fit.

The electric valve according to any one of claims 1 to 3, wherein the nut comprises a plastic nut and an annular metal connecting piece, and the plastic nut is made of engineering plastic on the basis of the annular metal connecting piece. Injection molding.

The electric valve according to claim 4, wherein an outer side of the annular metal connecting piece is welded and fixed to the valve seat.

The electric valve according to claim 5, wherein the outer side of the annular metal connecting piece is provided with not less than one outer notch.

The electric valve according to claim 5, wherein the inner side of the annular metal connecting piece is provided with not less than one inner side notch; and the annular connecting piece has no less than one annular portion Through hole.

The electric valve according to claim 4, wherein the valve needle screw assembly comprises a valve needle having a valve needle sleeve at one end, and a screw rod; wherein the valve needle is disposed at the valve core seat In the hole, one end of the valve needle is inserted into the valve port of the valve seat, and the other end is provided with a valve needle inner hole, and one end of the screw rod is inserted into the wide needle inner hole through the retaining ring.

The electric valve according to claim 8, wherein a spring is disposed in the inner hole of the valve needle, and an end of the lead screw abuts against the spring.

The electric valve according to claim 8, wherein the upper end of the nut is provided with an inner hole for mounting the screw, the upper end of the inner hole is a guiding hole, and the lower end of the inner hole is a threaded hole that forms a drive thread pair with an external thread of the lead screw.