KR20220024970A - Electronic expansion valve and its installation method - Google Patents

Abstract

An electromagnetic expansion valve and an installation method thereof, comprising: a valve seat assembly (10); Nut assembly 20 including a sequentially connected small-diameter section 21 and large-diameter section 22 - The large-diameter section 22 is connected to the valve seat assembly 10, and the small-diameter section 21 is the first Having a one-stop protrusion 211, the large-diameter section 22 is provided with a second stop protrusion 221 -; The valve needle assembly 30 is installed to pass through the nut assembly 20, the lower end of which is provided with a valve needle section 33, and the upper end is threadedly connected to the nut assembly 20; And the rotor assembly 40 having a third stop protrusion 41 that is fixedly connected to the valve needle assembly 30 through the top and drives the valve needle assembly 30 to rotate - the third stop protrusion 41 is installed so as to protrude inwardly at a position deviated from the bottom of the rotor assembly 40. When the electromagnetic expansion valve is fully opened, the third stop protrusion 41 comes into contact with the first stop protrusion 211 , and when the electromagnetic expansion valve is completely closed, the third stop protrusion 41 comes into contact with the second stop protrusion 221 . The present application solves the problem of relatively large noise during the operation of the electronic expansion valve in the prior art.

Description

Electronic expansion valve and its installation method

The present application relates to the field of valve technology, and more particularly, to an electronic expansion valve and a method for installing the same.

The fully open and fully closed position limiting function of the conventional electronic expansion valve is implemented through the common action of a spring guide rail, a slip ring, and a stop rod installed on the rotor. When the valve body is actuated, the stop rod rotates with the rotor, and the toggle slip ring slides within the stroke of the spring guide rail. This structure has two drawbacks.

1. All three parts are made of metal, so the metal impact noise is relatively high during operation. In particular, in the conventional multi-split system, since the electronic expansion valve is installed indoors, the operating noise generated by the electronic expansion valve cannot satisfy the use demand of people who seek comfort.

2. When installing the spring guide, only one end is fixed and the other end is not fixed, so the spring guide rail is easily deformed and the positional accuracy of the slip ring may be insufficient. In particular, during the reset operation of the electronic expansion valve, the initial position of the slip ring fluctuates relatively large, so the electronic expansion valve flow rate adjustment accuracy is insufficient and may affect the energy efficiency of the air conditioning system.

The main object of the present application is to solve the problem of relatively high noise during the operation of the electronic expansion valve of the prior art by providing an electronic expansion valve and a method for installing the same.

In order to achieve the above object, an aspect of the present application provides an electronic expansion valve. It includes: a valve seat assembly having a first connector and a second connector in communication with an external pipeline; Nut assembly comprising a sequentially connected small-diameter section and a large-diameter section - the large-diameter section is connected to the valve seat assembly, the small-diameter section has a first stop protrusion, and the large-diameter section has a second stop protrusion - ; a valve needle assembly installed to pass through the nut assembly, the lower end of which is provided with a valve needle section, and the upper end of which is threadedly connected to the nut assembly; and a rotor assembly fixedly connected to the valve needle assembly through the apex and driving the valve needle assembly to rotate, wherein the valve needle assembly moves along an axial direction of the electromagnetic expansion valve, so as to be in an on-off state between the first connector and the second connector. and the rotor assembly includes a third stop protrusion, the third stop protrusion being installed to protrude inwardly from a position deviated from the bottom of the rotor assembly. When the electromagnetic expansion valve is fully opened, the third stop protrusion comes into contact with the first stop protrusion, and when the electromagnetic expansion valve is completely closed, the third stop protrusion comes into contact with the second stop protrusion.

In addition, the valve needle assembly includes a diameter reduction section, a diameter expansion section and a valve needle section sequentially connected. The valve needle assembly extends into the nut assembly in the large diameter section, and the reduced diameter section is located in the small diameter section. The diameter expansion section is located in the large diameter section, and the valve needle section is located in the valve seat assembly. The small diameter section is threadedly connected to the diameter reduction section.

In addition, the rotor assembly has an inverted U-shaped structure and the rotor is installed to cover the outside of the nut assembly - the third stop protrusion is located inside the rotor, and the valve needle assembly passes through the cross section of the rotor - ; and an insert installed between the end face of the rotor and the valve needle assembly - the rotor drives the valve needle assembly to rotate through the insert, and a demolding hole is opened in the end face of the rotor, and the demolding hole is formed along the axial direction of the rotor assembly is opposite the third stop projection.

In addition, the nut assembly includes a nut having a large diameter section and a small diameter section; and a connecting plate installed outside the nut and integrally injection-molded with the nut, wherein the connecting plate is connected to the valve seat assembly.

Also, the length of the first stop protrusion is different from the length of the second stop protrusion.

Also, the distance from the end of the first stop protrusion to the nut center line is the same as the distance from the second stop protrusion to the nut center line.

In addition, the outside of the large-diameter section is provided with a plurality of positioning ribs. The positioning ribs abut against the inner wall of the valve seat assembly, and each positioning rib is installed along the circumferential direction of the large-diameter section.

Also, the large-diameter section forms a gap between the outer wall where the positioning rib is not installed and the inner wall of the valve seat assembly. A via is opened in the connecting plate, and the via communicates with the gap and forms a channel through which the fluid passes.

In addition, the nut further includes a balance hole, the balance hole being opened toward the axis of the nut.

In addition, in the large-diameter section, a positioning step is formed in a cross section close to the small-diameter section, and the third stop protrusion abuts on the positioning step to control the range of motion of the rotor assembly.

Further, the first stop projection, the second stop projection, and the third stop projection are all plastic members.

The electronic expansion valve further includes a sleeve. The sleeve connects with the valve seat assembly and forms a receiving cavity with the valve seat assembly. The first and second connectors are both located outside the receiving cavity, and the nut assembly, the valve needle assembly and the rotor assembly are all located within the receiving cavity.

The valve seat assembly also includes a valve seat having a first connector and a second connector, a portion of the nut assembly extending into the valve seat; and a sleeve seat installed outside the valve seat and connected to the valve seat, wherein the sleeve is connected to the sleeve seat.

Another aspect of the present application provides a method of installing an electronic expansion valve. The electromagnetic expansion valve is the electromagnetic expansion valve described above, and the installation method includes: assembling each member of a valve seat assembly of the electromagnetic expansion valve together; assembling each member of the valve needle assembly of the electromagnetic expansion valve together; extending the diameter reduction section of the valve needle assembly from the large diameter section of the nut assembly of the electromagnetic expansion valve into the nut assembly and tightening it on the small diameter section of the nut assembly; installing the nut assembly onto the valve seat assembly; Install the rotor assembly of the electromagnetic expansion valve on the outside of the nut assembly, bring the third stop projection of the rotor assembly into contact with the second stop projection of the nut assembly, and adjust the distance at which the valve needle assembly extends into the valve seat assembly. completely closing the electronic expansion valve and connecting the valve needle assembly together with the rotor assembly; and covering the sleeve of the electronic expansion valve outside the rotor assembly to connect it together with the valve seat assembly.

By applying the technical solution of the present application, the valve needle assembly is driven to rotate through the rotor assembly, and the nut assembly is fixedly installed with respect to the valve seat assembly. Since the valve needle assembly and the nut assembly are connected by a threaded structure, the valve needle assembly can rotate and simultaneously move along the axial direction. When the valve needle assembly moves to fully open the electromagnetic expansion valve, the third stop protrusion on the rotor assembly abuts the first stop protrusion on the nut assembly, preventing the rotor assembly from continuing to rotate. When the valve needle assembly moves to fully close the electronic expansion valve, a third stop protrusion on the rotor assembly abuts a second stop protrusion on the nut assembly, preventing the rotor assembly from continuing to rotate. The above-described installation method does not need to adopt parts such as springs and slip rings, and by directly driving the valve needle assembly to rotate through the rotor assembly to realize the opening and closing of the electronic expansion valve, relatively large noise due to metal impact is reduced. prevent problems from occurring. Also, because both the third stop protrusion and both ends of the rotor assembly keep a certain distance, that is, because the third stop protrusion is not located at the end of the rotor assembly, the third stop protrusion is relatively close to the center of the rotor assembly and the arm (arm) installation is more preferable. While more rationally stationary and receiving forces, the overall strength of the rotor assembly is improved and durability is improved. In addition, it follows the axial direction of the rotor assembly without interfering with the magnetism of the end of the rotor assembly, and both sides of the third stop protrusion exhibit a magnetic action. The rotor assembly is better subjected to the magnetic force of the energized coil, and the facing area of the rotor assembly and the outer magnetic ring is larger, so that the stroke demand of the valve needle assembly is more optimized.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which form a part of the present application, are provided to provide a further understanding of the present application. Exemplary embodiments of the present application and descriptions thereof are provided to interpret the present application, and do not limit the present application. The description of the accompanying drawings is as follows.
1 is a structural diagram when the electronic expansion valve of the present application is fully opened.
FIG. 2 is a structural diagram when the electromagnetic expansion valve is completely closed in FIG. 1 .
3 is a structural diagram of the rotor assembly of the electromagnetic expansion valve in FIG. 1 .
FIG. 4 is a plan view of FIG. 3 .
5 is a structural diagram of a nut assembly and a valve seat assembly of the electromagnetic expansion valve in FIG. 1 .
6 is a structural diagram of the nut assembly of the electromagnetic expansion valve in FIG. 1 .
Herein, the following reference numbers are included in the accompanying drawings.
Reference numeral 10 denotes a valve seat assembly, 11 a first connector, 12 a second connector, 13 a valve seat, 14 a sleeve seat, 20 a nut assembly, 21 a small diameter section, 211 a first stop protrusion, 22 a large diameter Section, 221 is a second stop protrusion, 23 is a nut, 24 is a connecting plate, 241 is a via, 25 is a positioning rib, 26 is a balance hole, 27 is a positioning step, 30 is a valve needle assembly, 31 is Reference numeral 32 is a diameter reduction section, 32 is a diameter expansion section, 33 is a valve needle section, 40 is a rotor assembly, 41 is a third stop protrusion, 42 is a rotor, 43 is an insert, 44 is a demolding hole, 50 is a sleeve.

Note that the embodiments of the present application and the features of the embodiments may be combined with each other as long as they do not conflict. Hereinafter, the present application will be described in detail with reference to the accompanying drawings and examples.

It is noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Unless otherwise specified, in the present application, the use of directional words such as "top, bottom, top, bottom" is typically described with respect to the direction shown in the drawings, or upright, perpendicular, or in the direction of gravity with respect to the member itself. has been explained about Similarly, for convenience of understanding and description, "inside and outside" means inside and outside based on the outline of each member itself, but the above-mentioned directional words are not used to limit the present application.

The present application provides an electronic expansion valve and a method for installing the same in order to solve the problem of relatively high noise during the operation of the electronic expansion valve in the prior art.

1 to 6 , the electromagnetic expansion valve includes a valve seat assembly 10 , a nut assembly 20 , a valve needle assembly 30 and a rotor assembly 40 . The valve seat assembly 10 has a first connector 11 and a second connector 12 that communicate with an external pipeline. The nut assembly 20 includes a small-diameter section 21 and a large-diameter section 22 that are sequentially connected. The large-diameter section 22 is connected to the valve seat assembly 10 , the small-diameter section 21 includes a first stop protrusion 211 , and the large-diameter section 22 includes a second stop protrusion 221 . be prepared The valve needle assembly 30 is installed to pass through the nut assembly 20 , the lower end thereof has a valve needle section 33 , and the upper end thereof is threadedly connected to the nut assembly 20 . The rotor assembly 40 is fixedly connected to the valve needle assembly 30 through the top and drives the valve needle assembly 30 to rotate. The valve needle assembly 30 controls the on-off state between the first connector 11 and the second connector 12 by moving along the axial direction of the electromagnetic expansion valve. The rotor assembly 40 has a third stop protrusion 41 , and the third stop protrusion 41 is installed to protrude inward from a position deviated from the bottom of the rotor assembly 40 . When the electromagnetic expansion valve is fully opened, the third stop protrusion 41 comes into contact with the first stop protrusion 211 , and when the electromagnetic expansion valve is completely closed, the third stop protrusion 41 comes into contact with the second stop protrusion 221 .

In this embodiment, the valve needle assembly 30 is driven to rotate through the rotor assembly 40 , and the nut assembly 20 is fixedly installed with respect to the valve seat assembly 10 . Since the valve needle assembly 30 and the nut assembly 20 are connected by a screw thread structure, the valve needle assembly 30 can rotate and simultaneously move along the axial direction. When the valve needle assembly 30 moves so that the electromagnetic expansion valve is fully opened, as shown in FIG. 1 , the third stop protrusion 41 on the rotor assembly 40 becomes the first stop protrusion on the nut assembly 20 . Abuts against 211 to prevent the rotor assembly 40 from continuing to rotate. When the valve needle assembly 30 moves so that the electromagnetic expansion valve is completely closed, as shown in FIG. 2 , the third stop protrusion 41 on the rotor assembly 40 moves to the second stop protrusion on the nut assembly 20 . Abuts against 221 to prevent the rotor assembly 40 from continuing to rotate. The above-described installation method does not need to adopt parts such as springs and slip rings, and by directly driving the valve needle assembly 30 to rotate through the rotor assembly 40 to implement the opening and closing of the electronic expansion valve, metal impact This avoids the problem of relatively loud noise. In addition, since both ends of the third stop protrusion 41 and the rotor assembly 40 maintain a certain distance, that is, since the third stop protrusion 41 is not located at the end of the rotor assembly 40, the second The arm installation is more preferable because the three-stop protrusion 41 is relatively close to the center of the rotor assembly 40 . Also, the overall strength of the rotor assembly 40 is improved and durability is improved while receiving the force by stopping more reasonably. In addition, it follows the axial direction of the rotor assembly 40 without interfering with the magnetism of the end of the rotor assembly 40, and both sides of the third stop protrusion 41 exhibit a magnetic action. The rotor assembly 40 is more susceptible to the magnetic force of the energized coil, and the facing area of the rotor assembly 40 and the external magnetic ring is larger, so that the stroke demand of the valve needle assembly 30 is more optimized.

In this embodiment, the valve needle assembly 30 includes a diameter reduction section 31, a diameter expansion section 32 and a valve needle section 33 connected sequentially. The valve needle assembly 30 extends into the nut assembly 20 in the large diameter section 22 . The diameter reduction section 31 is located in the small diameter section 21 , and the diameter expansion section 32 is located in the large diameter section 22 . The valve needle section 33 is located in the valve seat assembly 10 , and the small diameter section 21 is threadedly connected to the diameter reduction section 31 . The valve needle assembly 30 of this embodiment includes a valve needle, a gasket, a spring, a bush, a spring sleeve, and a screw rod. Here, the valve needle is used as the valve needle section 33 , the spring sleeve is used as the diameter expansion section 32 , and the screw rod is used as the diameter reduction section 31 . The valve needle is extended into the valve seat 13 to implement control for on/off of the first connector 11 and the second connector 12 . One end of the valve needle far from the first connector 11 is in contact with the gasket. The screw rod is extended into the nut 23 and is threadedly connected to the nut 23 . The spring is installed to cover the screw rod and the gasket at the same time, and both ends thereof are in contact with the screw rod and the gasket, respectively. Accordingly, the screw rod and the gasket tend to move away from each other, leaving a relatively small gap between the screw rod and the gasket. When the rotor assembly 40 drives the screw rod to move slightly larger, the valve needle and gasket abut against the valve seat 13 and thus cannot continue to move. At this time, the screw rod can continue to compress the spring without driving the gasket to move. The movement of the screw rod has a certain margin, and the spring sleeve is installed to cover the outer side of the spring and connected to the screw rod and gasket, so the spring is protected.

3 and 4 , the rotor assembly 40 includes a rotor 42 and an insert 43 . The rotor 42 has an inverted U-shaped structure and is installed to cover the outside of the nut assembly 20 . The third stop protrusion 41 is located inside the rotor 42 and extends along the radial direction of the rotor 42 . The rotor 42 is installed so that one end facing the valve seat assembly 10 is opened, and the one end far from the valve seat assembly 10 is installed so that it is closed. The valve needle assembly 30 passes through the installed end face of the rotor 42 to be closed and is injection-molded integrally with the rotor 42 . The insert 43 is a sleeve type, and is installed to cover the valve needle assembly 30 . It is also located between the end face of the rotor 42 and the valve needle assembly 30 . That is, the rotor 42 is driven and connected to the valve needle assembly 30 through the insert 43 . Therefore, the rotor 42 is driven to rotate the valve needle assembly 30 through the insert 43 to implement the drive for the valve needle assembly (30). In addition, a demolding hole 44 is opened in the cross section of the rotor 42 , along the axial direction of the rotor assembly 40 . The demolding hole 44 faces the third stop protrusion 41 , and the demolding hole 44 facilitates the demolding process and facilitates the processing of the third stop protrusion 41 .

5 and 6 , the nut assembly 20 includes a nut 23 and a connecting plate 24 . The nut 23 is the most important member of the nut assembly 20 , and has a large diameter section 22 and a small diameter section 21 . The connecting plate 24 is installed outside the nut 23 and is integrally injection-molded with the nut 23 . When the nut 23 is installed on the valve seat assembly 10 , the connecting plate 24 abuts the valve seat assembly 10 , meaning that the nut assembly 20 is installed in place. Again, the connection plate 24 and the valve seat assembly 10 may be connected together through a method such as laser welding.

Optionally, the first stop protrusion 211 and the second stop protrusion 221 start from sections of different diameters of the nut 23 and extend along the radial direction. Accordingly, the length of the first stop protrusion 211 is different from the length of the second stop protrusion 221 . Also preferably, the distance from the end of the first stop protrusion 211 to the center line of the nut 23 is the same as the distance from the second stop protrusion 221 to the center line of the nut 23 . Therefore, both the first stop protrusion 211 and the second stop protrusion 221 can be securely in contact with the third stop protrusion 41 to implement a position limiting function.

As shown in FIG. 6 , a plurality of positioning ribs 25 are provided on the outside of the large diameter section 22 . The positioning ribs 25 extend along the axial direction of the large-diameter section 22 . When the large diameter section 22 is installed in the valve seat assembly 10, the positioning ribs 25 are press-fitted with the inner wall of the valve seat assembly 10 to ensure the coaxiality of the installation. In general, three to four positioning ribs 25 are installed, and each positioning rib 25 is installed at equal intervals along the circumferential direction of the large-diameter section 22 .

The positioning rib 25 is positioned between the outer wall of the large diameter section 22 and the inner wall of the valve seat assembly 10 . Accordingly, in the large-diameter section 22 , a gap is naturally formed as a balance cavity between the outer wall on which the positioning rib 25 is not installed and the inner wall of the valve seat assembly 10 . In addition, a via 241 is opened in the connecting plate 24 , and the via 241 communicates with the gap to form a balance channel for the fluid to pass therethrough.

Optionally, the nut 23 also has a balance hole 26 . The balance hole 26 passes through the nut 23 from the outside of the nut 23 toward the axis of the nut 23 . Preferably, the balance hole 26 is outlined along the radial direction of the nut 23 . Of course, it may be opened obliquely at a certain angle.

In the present embodiment, the positioning step 27 is formed in the large-diameter section 22 in a cross section close to the small-diameter section 21 . The positioning step 27 matches the second stop protrusion 221 and stops the motion of the third stop protrusion 41 together. When the third stop protrusion 41 and the second stop protrusion 221 come into contact, the third stop protrusion 41 also comes into contact with the positioning step 27, so that the range of motion of the rotor assembly 40 is further increased. You can definitely control it.

In this embodiment, the first stop protrusion 211, the second stop protrusion 221, and the third stop protrusion 41 are all plastic members. Because it is a plastic member, the impact sound is relatively small when stopping and limiting the position. In addition, all three stop projections are injection molded in the mold, and the mold has high precision and excellent dimensional consistency. When the electromagnetic expansion valve is reset, there is no recoil and the initial positional consistency is excellent, so that the flow precision of the electromagnetic expansion valve is improved.

Preferably, only the rotor assembly 40 needs to be magnetic and the nut assembly 20 need not be magnetic. Accordingly, the nut 23 is a pure plastic member as a whole, and the rotor 42 is manufactured as a magnetic plastic member by adding magnetic powder to the plasticity. Through this, it is possible to reduce the effect of the impact sound while satisfying the magnetic requirements of the rotor 42 . Since the insert 43 does not collide, it can be installed as a metal member.

1 and 2 , the electronic expansion valve further includes a sleeve 50 . The sleeve 50 is connected to the valve seat assembly 10 and forms a receiving cavity with the valve seat assembly 10 . The first coupler 11 and the second coupler 12 are both located outside the receiving cavity. Nut assembly 20 , valve needle assembly 30 , and rotor assembly 40 are all located within the receiving cavity. The sleeve 50 protects the uncovered structure of the electronic expansion valve without affecting the normal use of the electronic expansion valve. In addition, the energizing coil may be installed to be wound on the outside of the sleeve 50 to implement driving of the rotor 42 .

In this embodiment, the valve seat assembly 10 includes a valve seat 13 and a sleeve seat 14 . The valve seat 13 has a first connector 11 and a second connector 12 . The large-diameter section 22 of the nut 23 extends into the valve seat 13 and is press-fitted with the valve seat 13 . When the large-diameter section 22 is mounted in the valve seat 13 through a pressure installation method, etc., when the connecting plate 24 and the sleeve seat 14 come into contact with each other, it means that they are installed in place. The valve seat 13 is a basic member of the electromagnetic expansion valve and provides a basic supporting function. The sleeve seat 14 is installed outside the valve seat 13 and is connected to the valve seat 13 . The sleeve 50 is connected to the sleeve seat 14 . The sleeve sheet 14 is used to install the sleeve 50 , and a coil plate is installed on the sleeve sheet 14 to arrange and wind the coil.

This embodiment further provides a method for installing an electromagnetic expansion valve. The electromagnetic expansion valve is the electromagnetic expansion valve described above, and the installation method is as follows.

First, each member of the valve seat assembly 10 of the electromagnetic expansion valve is assembled together, and the valve seat 13 , the external connector and the sleeve seat 14 are welded together by the valve seat assembly 10 . Each member of the valve needle assembly 30 of the electromagnetic expansion valve is assembled together, and the valve needle, gasket, spring, bush, spring sleeve and screw rod are assembled together as a valve needle assembly 30 . Thereafter, the diameter reduction section 31 of the valve needle assembly 30 is extended from the large diameter section 22 of the nut assembly 20 of the electromagnetic expansion valve into the nut assembly 20, and the small diameter of the nut assembly 20 is inserted. Screw on the diameter section 21 . The nut assembly 20 is installed on the valve seat assembly 10 again, and the connecting plate 24 and the sleeve seat 14 are welded together through a laser. The rotor assembly 40 of the electromagnetic expansion valve is installed on the outside of the nut assembly 20 , and the side of the third stop projection 41 of the rotor assembly 40 is attached to the second stop projection 221 of the nut assembly 20 . ) and the other side of the third stop protrusion 41 is brought into contact with the positioning step 27 on the nut 23 . After that, the position of the valve needle assembly 30 is adjusted, the distance at which the valve needle assembly 30 extends into the valve seat assembly 10 is adjusted, and the valve needle assembly 30 is tightened to the zero pulse position to electronically expand Close the valve completely. After the adjustment is completed, when the third stop protrusion 41 and the second stop protrusion 221 come into contact, the electronic expansion valve is in a completely closed state, and then the screw rod and the insert 43 are again laser welded. weld together Finally, when the sleeve 50 of the electromagnetic expansion valve is covered on the outside of the rotor assembly 40 and laser welded together with the sleeve seat 14, the assembly of the electromagnetic expansion valve can be completed.

It should be noted that in the above-described embodiment, the plurality means at least two.

As can be seen from the above description, the embodiment of the present application implements the following technical effects.

1. In the prior art, the problem of relatively large noise during the operation of the electromagnetic expansion valve has been solved.

2. The third stop protrusion is relatively close to the center, so the arm installation is more preferable, and the overall strength is improved and the durability is further improved.

3. The third stop projection does not interfere with the magnetism of the rotor assembly end. The rotor assembly is better subjected to the magnetic force of the energizing coil, and the facing area of the rotor assembly is relatively large to meet the stroke requirement of the valve needle assembly.

4. When the plastic member is stopped and position is limited, the impact sound is relatively small and the precision of the mold is high, so the dimensional consistency is excellent.

Of course, the above-described embodiments are only some, not all of the embodiments of the present application. All other embodiments obtained by those skilled in the art without creative work based on the embodiments of the present application fall within the protection scope of the present application.

Claims (14)

An electronic expansion valve comprising:
a valve seat assembly 10 having a first connector 11 and a second connector 12 communicating with an external pipeline;
Nut assembly 20 including a sequentially connected small-diameter section 21 and large-diameter section 22 - The large-diameter section 22 is connected to the valve seat assembly 10, and the small-diameter section 21 ) is provided with a first stop protrusion 211, the large diameter section 22 is provided with a second stop protrusion 221 -;
a valve needle assembly 30 installed to pass through the nut assembly 20 and provided with a valve needle section 33 at a lower end thereof and threadedly connected to the nut assembly 20 at an upper end; and
A rotor assembly 40 that is fixedly connected to the valve needle assembly 30 through an apex and drives the valve needle assembly 30 to rotate. The valve needle assembly 30 extends along the axial direction of the electromagnetic expansion valve. By moving, the on-off state between the first connector 11 and the second connector 12 is controlled, and the rotor assembly 40 has a third stop protrusion 41 , and the third stop The protrusion 41 is installed so as to protrude inward from a position deviated from the bottom of the rotor assembly 40,
When the electronic expansion valve is fully opened, the third stop protrusion 41 comes into contact with the first stop protrusion 211, and when the electronic expansion valve is completely closed, the third stop protrusion 41 moves to the second stop protrusion ( 221) and an electromagnetic expansion valve, characterized in that it abuts. According to claim 1,
The valve needle assembly 30 includes a sequentially connected diameter reduction section 31, a diameter expansion section 32 and the valve needle section 33,
The valve needle assembly 30 extends into the nut assembly 20 in the large diameter section 22, and the diameter reduction section 31 is located in the small diameter section 21, and the diameter expansion section ( 32) is located in the large diameter section 22, the valve needle section 33 is located in the valve seat assembly 10, and the small diameter section 21 is threadedly connected to the diameter reduction section 31 Electronic expansion valve, characterized in that. According to claim 1,
The rotor assembly 40,
Rotor 42 having an inverted U-shaped structure and installed to cover the outside of the nut assembly 20 - The third stop protrusion 41 is located inside the rotor 42, the valve needle assembly 30 ) through the cross section of the rotor 42 - ; and
Insert 43 installed between the end face of the rotor 42 and the valve needle assembly 30 - The rotor 42 is driven to rotate the valve needle assembly 30 through the insert 43 and a demolding hole 44 is opened in the end face of the rotor 42 , and the demoulding hole 44 faces the third stop protrusion 41 along the axial direction of the rotor assembly 40 . - Electronic expansion valve comprising: According to claim 1,
The nut assembly 20,
a nut 23 having the large-diameter section 22 and the small-diameter section 21; and
and a connecting plate (24) installed outside the nut (23) and integrally injection-molded with the nut (23), wherein the connecting plate (24) is connected to the valve seat assembly (10). electronic expansion valve. 5. The method of claim 4,
The electronic expansion valve, characterized in that the length of the first stop protrusion (211) and the length of the second stop protrusion (221) are different. 6. The method of claim 5,
The electromagnetic expansion valve, characterized in that the distance from the end of the first stop protrusion (211) to the center line of the nut (23) is the same as the distance from the second stop protrusion (221) to the center line of the nut (23). 5. The method of claim 4,
The outer side of the large diameter section 22 is provided with a plurality of positioning ribs 25, the positioning ribs 25 abut against the inner wall of the valve seat assembly 10, and each of the positioning ribs 25 ) is an electromagnetic expansion valve, characterized in that it is installed along the circumferential direction of the large diameter section (22). 8. The method of claim 7,
The large diameter section 22 forms a gap between the outer wall where the positioning rib 25 is not installed and the inner wall of the valve seat assembly 10 , and a via 241 is opened in the connecting plate 24 . and the via (241) communicates with the gap and forms a channel through which the fluid passes. 5. The method of claim 4,
The nut (23) further includes a balance hole (26), and the balance hole (26) is opened toward the axis of the nut (23). According to claim 1,
In the large-diameter section 22, a positioning step 27 is formed in a cross section close to the small-diameter section 21, and the third stop protrusion 41 abuts on the positioning step 27 and the Electronic expansion valve, characterized in that the range of motion of the rotor assembly (40) can be controlled. According to claim 1,
The electromagnetic expansion valve, characterized in that the first stop protrusion (211), the second stop protrusion (221) and the third stop protrusion (41) are all plastic members. According to claim 1,
The electromagnetic expansion valve further includes a sleeve (50), the sleeve (50) being connected to the valve seat assembly (10) and forming a receiving cavity with the valve seat assembly (10), the first connector (11) ) and the second connector (12) are both located outside the receiving cavity, and the nut assembly (20), the valve needle assembly (30) and the rotor assembly (40) are all located within the receiving cavity electronic expansion valve. 13. The method of claim 12,
The valve seat assembly 10,
a valve seat (13) having the first connector (11) and the second connector (12), a portion of the nut assembly (20) extending into the valve seat (13); and
Electronic expansion, characterized in that it includes a sleeve seat (14) installed outside the valve seat (13) and connected to the valve seat (13), wherein the sleeve (50) is connected to the sleeve seat (14) valve. A method for installing an electromagnetic expansion valve, comprising:
The electromagnetic expansion valve is an electromagnetic expansion valve according to any one of claims 1 to 13, wherein the installation method comprises:
assembling each member of the valve seat assembly (10) of the electromagnetic expansion valve together;
assembling each member of the valve needle assembly 30 of the electromagnetic expansion valve together;
The diameter reduction section 31 of the valve needle assembly 30 extends from the large diameter section 22 of the nut assembly 20 of the electromagnetic expansion valve into the nut assembly 20, and the nut assembly 20 Tightening on the small-diameter section (21) of;
installing the nut assembly (20) onto the valve seat assembly (10);
The rotor assembly 40 of the electromagnetic expansion valve is installed outside the nut assembly 20 , and the third stop protrusion 41 of the rotor assembly 40 is installed as a second stop of the nut assembly 20 . The electronic expansion valve is completely closed by making contact with the protrusion 221 , and adjusting the distance at which the valve needle assembly 30 extends into the valve seat assembly 10 , and rotates the valve needle assembly 30 . coupling together with an electronic assembly (40); and
and covering the sleeve (50) of the electromagnetic expansion valve on the outside of the rotor assembly (40) to connect the sleeve (50) together with the valve seat assembly (10).

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