CN211117617U

CN211117617U - Electronic expansion valve

Info

Publication number: CN211117617U
Application number: CN201922059856.7U
Authority: CN
Inventors: 唐予松
Original assignee: JIANGXI AUDY BRASSWORK Inc
Current assignee: JIANGXI AUDY BRASSWORK Inc
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-28
Anticipated expiration: 2029-11-25

Abstract

The utility model provides an electronic expansion valve, which comprises a valve seat, and a housing, the outlet pipe of being connected with this disk seat lower extreme, import pipe with this disk seat outer wall connection, and establish the magnet in this shell, the rotor core, the valve rod, needle and compression spring, be equipped with the metal gasket on the spacing groove upper end of rotor core, its and this compression spring's upper end direct contact, thus, effectively avoided compression spring and the inside direct contact of rotor core, so the spring just can not cause certain wearing and tearing to the rotor core of PPS material when moving repeatedly, just also avoided because of the powder that the rotor core wearing and tearing come out to bring great quality hidden danger to the vice influence of screw thread, consequently the utility model discloses a structure is more reasonable, product quality is more reliable.

Description

Electronic expansion valve

Technical Field

The utility model relates to a valve especially indicates the electronic expansion valve of the flow of control fluid.

Background

Electronic expansion valves are widely used in the prior art for throttling and depressurizing a fluid and regulating the flow rate of the fluid, as shown in fig. 1, by generating a signal by using a regulated parameter, according to the computer set program, the voltage or current applied to the coil is controlled to drive the magnetic rotor of the main valve body to rotate, the rotor core 200, which is fixedly coupled to the magnetic rotor 100 and rotates following the magnetic rotor 100, moves the valve needle 300, and for this purpose, a rotor core (nut member) 200 is provided in the electronic expansion valve, an internal thread structure is provided in the rotor core (nut member) 200, and accordingly, an external thread structure is provided on the lead screw 400, through the matching of the screw thread pair, the rotor core 200 drives the valve needle 300 to do lifting motion while doing rotary motion, the flow rate of the refrigerant flowing through the valve port 501 is controlled by adjusting the opening degree of the valve needle 300 in the valve port 501 of the valve seat 500, so as to realize the system function and achieve the purpose of accurate control.

In order to reduce the internal leakage performance of the valve and improve the sealing performance between the valve needle 300 and the valve port 501, the expansion valve is provided with a valve opening pulse function, that is, after a certain step of current (generally 12 to 52 steps) is applied to the coil, the valve needle still does not generate lifting motion, that is, the valve opening pulse. This process is the process of releasing the compression spring pressure. On the same principle, the process of spring pre-tightening is performed when the valve is closed, pre-tightening force is generated between the valve needle 300 and the valve port 501, and reliability of internal leakage performance of the valve is guaranteed.

The rotor core 200 is made of PPS (engineering plastics), the valve needle 300 is installed in the limit groove 201 of the rotor core 200, and a compression spring 600 is arranged in the upper part of the limit groove 201, as shown in fig. 1, the upper end of the spring is in contact with the inner wall of the upper end of the limit groove of the rotor core, the lower end of the spring is in contact with the limit step 301 of the valve needle 300, and the spring pressure is released between the upper end and the lower end. When the valve opening pulse step is performed, the rotor rotates without the needle being lifted upward, and the spring pressure is released by the relative movement between the rotor core 200 and the compression spring 600. Because the spring is stainless steel, and the rotor core is the PPS material, and there is the difference in hardness between the two, consequently can lead to between them when the motion each other, the spring has caused certain wearing and tearing to the rotor core, perhaps grinds out the powder with the inner wall of the spring spacing groove upper end of rotor core, and serious maybe even wear through, we know, and the powder that produces when wearing and tearing if get into the screw thread pair, probably can lead to the screw thread card to die, leads to the valve body inefficacy, consequently there is great quality hidden danger in the present structure product.

Disclosure of Invention

An object of the utility model is to overcome prior art's not enough, provide a more reasonable, the more reliable electronic expansion valve of product quality of structure.

In order to solve the technical problem, the utility model adopts the following technical scheme:

an electronic expansion valve comprises a valve seat, a shell, an outlet pipe connected with the lower end of the valve seat, an inlet pipe connected with the outer wall of the valve seat, and a magnet, a rotor core, a valve rod, a valve needle and a compression spring which are arranged in the shell; the upper middle part of the valve rod is connected and installed in the rotor core through a thread pair, after the compression spring and the upper end of the valve needle are arranged in the limiting groove in the upper part of the rotor core, the lower middle part of the valve needle sequentially falls into the hollow holes of the valve rod and the valve seat, and the upper end of the limiting groove of the rotor core is provided with a metal gasket which is contacted with the upper end of the compression spring.

In a modification of the above electronic expansion valve, the metal gasket is circular.

In a modification of the above-described electronic expansion valve, the metal gasket is circular with positioning lugs.

In a modification of the above electronic expansion valve, the upper and lower ends of the compression spring are ground into flat heads.

Compared with the prior art, the beneficial effects of the utility model are that: because the spacing groove upper end at the rotor core is equipped with metal gasket, its upper end direct contact with this compression spring, like this, effectively avoided compression spring and the inside direct contact of rotor core, so the spring just can not cause certain wearing and tearing to the rotor core of PPS material when moving repeatedly, just also avoided because of the powder that the rotor core wearing and tearing come out brings great quality hidden danger to the screw thread side effect, consequently the utility model discloses a structure is more reasonable, product quality is more reliable.

The invention will be described in further detail with reference to the following detailed description and accompanying drawings:

[ description of the drawings ]

FIG. 1 is a schematic diagram of a prior art electronic expansion valve;

fig. 2 is a schematic structural diagram of an embodiment of the present invention;

fig. 3 is a schematic perspective view of a first embodiment of a metal gasket according to the present invention;

fig. 4 is a schematic perspective view of a second embodiment of a metal gasket according to the present invention;

fig. 5 is a schematic perspective view of a compression spring according to an embodiment of the present invention.

[ detailed description ] embodiments

The utility model relates to an electronic expansion valve, as shown in figure 2, comprising a valve seat 1, a shell 2, an outlet pipe 3 connected with the lower end of the valve seat 1, an inlet pipe 4 connected with the outer wall of the valve seat 1, and a magnet 5, a rotor core 6, a valve rod 7, a valve needle 8 and a compression spring 9 which are arranged in the shell 1; the upper and middle parts of the valve rod 7 are installed in the rotor core 6 through a screw thread pair connection, and after the compression spring 9 and the upper end of the valve needle 8 are arranged in the limiting groove 61 of the upper part of the rotor core 6, the lower and middle parts of the valve needle 8 sequentially fall into the hollow holes of the valve rod 7 and the valve seat 1, which are consistent with the structure of the current electronic expansion valve and are not described in detail herein, except that: the spacing groove 61 upper end of rotor core 6 is equipped with metal gasket 10, and its upper end contact with this compression spring 9 has effectively avoided compression spring 9 and the inside direct contact of rotor core 6, so the spring also can not cause wearing and tearing to the rotor core of PPS material when moving repeatedly, has just also avoided the powder that comes out because of the rotor core wearing and tearing to bring great quality hidden danger to the screw thread side effect, consequently the utility model discloses a structure is more reasonable, product quality is more reliable.

The metal gasket 10 is usually made of stainless steel, and may be in a shape of a circle (as shown in fig. 4), and preferably, the metal gasket 10 is in a shape of a circle with a positioning lug 101 (as shown in fig. 3), and a positioning slot (not shown in the figure, and the space formed by the positioning lug 101 and the receiving slot matches with the whole formed by the gasket and the positioning lug) is provided in the receiving slot 62 of the rotor core 6, so that when the gasket is installed in the rotor core, it is ensured that no relative movement is generated between the gasket and the rotor core, thereby further reducing the wear on the rotor core. In the embodiment shown in fig. 3, there are two positioning ears 101, but one may be used. The gasket can be directly embedded in the inner wall of one of the half cylinders of the rotor core during the injection molding processing of the rotor core; alternatively, the accommodating groove 62 may be formed at the upper end of the limiting groove 61 of the rotor core 6 during the injection molding of the rotor core, and the gasket may be inserted into the accommodating groove 62 during the later assembly process, as shown in the embodiment of fig. 2. As is known, the rotor core 6 is formed by two half-cylinders being closed together, for which purpose the receiving groove 62 is also formed by a groove provided on the contact surface of the two half-cylinders, respectively.

Preferably, the upper and lower ends of the compression spring 9 are ground to a flat end to make the force applied to the valve needle uniform.

Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art from this disclosure that various changes or modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims. Therefore, the detailed description of the embodiments of the present disclosure is to be construed as merely illustrative, and not limitative of the present disclosure, but rather to limit the scope thereof by the appended claims.

Claims

1. An electronic expansion valve comprises a valve seat, a shell, an outlet pipe connected with the lower end of the valve seat, an inlet pipe connected with the outer wall of the valve seat, and a magnet, a rotor core, a valve rod, a valve needle and a compression spring which are arranged in the shell; the upper portion installs in this rotor core through screw thread pair connection in the valve rod, compression spring and needle upper end set up in the spacing groove on this rotor core upper portion back, and lower part falls into in proper order in the cavity hole of this valve rod and disk seat in this needle, its characterized in that: and a metal gasket is arranged at the upper end of the limiting groove of the rotor core and is in contact with the upper end of the compression spring.

2. An electronic expansion valve according to claim 1, wherein: the metal gasket is circular.

3. An electronic expansion valve according to claim 1, wherein: the metal gasket is round with positioning lugs.

4. An electronic expansion valve according to any of claims 1 to 3, wherein: the upper end and the lower end of the compression spring are ground into flat heads.