WO2022142607A1

WO2022142607A1 - Electronic expansion valve and air conditioning device

Info

Publication number: WO2022142607A1
Application number: PCT/CN2021/124979
Authority: WO
Inventors: 詹少军; 楼金强; 郭夏亚
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2020-12-28
Filing date: 2021-10-20
Publication date: 2022-07-07
Also published as: JP2023546312A; CN214307709U; KR20230053725A

Abstract

An electronic expansion valve and an air conditioning device. The electronic expansion valve comprises a rotor (4), a screw rod (6), a first connecting plate (51), and a second connecting plate (52), the first connecting plate (51) is fixedly connected to the rotor (4), and the second connecting plate (52) is fixedly connected to the screw rod (6). The second connecting plate (52) is a metal member, the first connecting plate (51) is a plastic member, and the first connecting plate (51) is over-molded on the outer side of the second connecting plate (52); the rotor (4) drives, by means of the first connecting plate (51) and the second connecting plate (52), the screw rod (6) to rotate.

Description

Electronic expansion valve and air conditioning equipment

Related applications

This application claims the priority of the Chinese patent application filed on December 28, 2020, the application number is 202023222957.0, and the invention name is "Electronic Expansion Valve and Air Conditioning Equipment", the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the technical field of valves, in particular to an electronic expansion valve and air conditioning equipment.

Background technique

An electronic expansion valve is a throttling element that can control the flow of refrigerant into a refrigeration unit according to a preset program. As a new type of control element, the electronic expansion valve has become an important part of the intelligentization of the refrigeration system, and it is also an important means and guarantee for the optimization of the refrigeration system, and is used in more and more fields.

The electronic expansion valve includes a screw, a first connecting plate, a second connecting plate and a rotor, and the rotor drives the screw to rotate through the first connecting plate and the second connecting plate. However, the common connection between the first connecting plate and the second connecting plate is not firm enough, which leads to the situation that the first connecting plate and the second connecting plate are prone to relative sliding.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide an electronic expansion valve and an air conditioner to solve the problem that the connection between the first connecting plate and the second connecting plate is not firm enough.

The application provides an electronic expansion valve, the electronic expansion valve includes a rotor, a screw, a first connecting plate and a second connecting plate, the first connecting plate is fixedly connected to the rotor, and the second connecting plate is fixedly connected to the screw. The second connecting plate is a metal part, the first connecting plate is a plastic part, and the first connecting plate is overmolded on the outside of the second connecting plate; the rotor drives the screw to rotate through the first connecting plate and the second connecting plate.

In an embodiment of the present application, the electronic expansion valve further includes a guide piece, the guide piece is a plastic part, and the guide piece and the first connecting plate are integrally formed. Because the first connecting plate and the guide piece are integrally formed. The integral molding structure ensures the stability of the structure between the first connecting plate and the guide piece, and when the guide piece is subjected to external force, the external force can be evenly dispersed, so that there is no stress concentration that causes the guide piece to break. In addition, since the first connecting plate and the guide plate are integrally formed, the guide plate and the first connecting plate do not need to be connected by welding, that is, the welding steps are reduced, and the guide plate and the first connecting plate are not connected together by welding. There is no connection gap between a connection plate. Therefore, compared with the welding connection method of the first connecting plate and the guide piece, it is obvious that the connection method of the first connecting plate and the guide piece integrally formed is more firm, and the guide piece will not deviate from the original relative to the first connecting plate. Location.

In an embodiment of the present application, the first connecting plate and the guide piece are injection-molded structures. The injection molding process is suitable for mass production of parts with complex shapes, and the injection molding process has fast production speed, high production efficiency and high processing accuracy. The injection-molded structure processed by the injection-molding process has the advantages of high precision and low manufacturing cost.

In an embodiment of the present application, a side of the first connecting plate away from the guide plate is provided with an embedding portion, and the side of the embedding portion facing away from the first connecting plate is provided with an embedding groove, and the second connecting plate is embedded. in the socket. The second connecting plate is embedded in the embedding groove of the first connecting plate, so that the first connecting plate and the second connecting plate have a larger contact area. At this time, the first connecting plate and the second connecting plate are connected more closely. It is beneficial to the structural stability of the electronic expansion valve.

In an embodiment of the present application, the inner wall of the embedding groove is provided with a protrusion, the outer peripheral side of the second connecting plate is provided with a groove corresponding to the protrusion, and the protrusion is clamped in the groove, so that the second connecting plate is locked. connected to the first connection board. By arranging protrusions on the inner wall of the embedding groove, the outer peripheral side of the second connecting plate is provided with grooves corresponding to the protrusions, and the protrusions are clamped in the grooves. The contact area between the first connecting plate and the second connecting plate is further enlarged, so that the first connecting plate and the second connecting plate are connected more closely. In addition, the existence of the protrusions and grooves prevents the second connecting plate from rotating relative to the first connecting plate, which further improves the structural stability of the electronic expansion valve.

In an embodiment of the present application, the number of grooves is multiple, and the multiple grooves are evenly distributed along the circumferential direction of the second connecting plate. The number of grooves is set to be multiple, which can make the connection between the first connecting plate and the second connecting plate more firm, and the even distribution of the multiple grooves along the circumferential direction of the second connecting plate is beneficial to the processing and manufacture of the grooves.

In an embodiment of the present application, the first connecting plate and the second connecting plate are both disc-shaped, the center of the second connecting plate is provided with a first through hole, and the center of the first connecting plate is provided with a second through hole. One end of the screw rod passes through the second through hole and the first through hole in sequence, and the screw rod is in clearance fit with the first through hole, and the screw rod is in clearance fit with the second through hole, and the screw rod is welded and connected with the second connecting plate. In this way, when the rotor drives the first connecting plate and the second connecting plate to rotate, the screw can be positioned at the center of rotation, preventing the screw from being eccentric during the rotation process and affecting the opening and closing of the electronic expansion valve.

In an embodiment of the present application, the outer contour of the cross section of the first connecting plate is non-circular. Such arrangement is beneficial to further prevent the relative rotation of the first connecting plate and the rotor.

In an embodiment of the present application, the outer contour of the cross-section of the second connecting plate is non-circular. This arrangement is beneficial to further prevent the first connecting plate and the second connecting plate from rotating relative to each other.

The present application further provides an air conditioner, including the electronic expansion valve described in any one of the above embodiments.

In the electronic expansion valve and the air conditioner provided by the present application, the first connecting plate and the second connecting plate can be processed separately, which greatly improves the processing flexibility of the first connecting plate and the second connecting plate. In addition, the first connecting plate is overmolded on the outside of the second connecting plate, which also ensures that the second connecting plate can be firmly connected to the first connecting plate, so that the structure of the connecting plate assembly is more stable. That is, the electronic expansion valve provided by the present application solves the common problem that the connection between the first connecting plate and the second connecting plate is not firm enough.

Description of drawings

1 is a cross-sectional view of an electronic expansion valve according to an embodiment of the application;

FIG. 2 is a schematic diagram of the connection structure of the connection plate assembly and the guide piece according to an embodiment of the application;

FIG. 3 is a schematic diagram of the connection structure of the first connection plate and the guide piece according to an embodiment of the application;

FIG. 4 is a schematic structural diagram of a second connection board according to an embodiment of the application.

Reference numerals: 1, valve body; 11, valve cavity; 12, valve port; 2, first connecting pipe; 3, second connecting pipe; 4, rotor; 5, connecting plate assembly; 51, first connecting plate; 511, embedded part; 512, embedded groove; 513, protrusion; 514, second through hole; 52, second connecting plate; 521, groove; 522, first through hole; 6, screw rod; 7, nut Sleeve; 8. Limiting piece; 81. Guide piece; 82. Limiting spring; 83. Stop ring; 9. Valve head.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that when a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there may also be an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. When a component is said to be "fixed" to another component, it may be directly fixed to the other component or there may also be an intervening component.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present application provides an electronic expansion valve. The electronic expansion valve is used in a refrigeration system to realize the function of throttling and reducing pressure. The refrigeration system can be, for example, an automobile air conditioner, a cold chain system, or a commercial air conditioner system. Of course, in other embodiments, the electronic expansion valve can also be applied to other systems.

Referring to FIG. 1 , the present application provides an electronic expansion valve, which includes a valve body 1 , a rotor 4 , and a stator assembly (not shown), and the valve body 1 is connected with a first connecting pipe 2 and a second connecting pipe 3. In this embodiment, the electronic expansion valve is a two-way valve. When the first connecting pipe 2 is an inlet pipe, the medium enters the electronic expansion valve through the first connecting pipe 2, and then flows out through the second connecting pipe 3; When the connecting pipe 3 is an inlet pipe, the medium enters the interior of the electronic expansion valve through the second connecting pipe 3 , and then flows out through the first connecting pipe 2 . Of course, in other embodiments, the electronic expansion valve may also be a one-way valve, which is not limited in this application.

The valve body 1 is provided with a valve cavity 11 , the rotor 4 is provided in the valve cavity 11 , and the stator assembly is provided outside the valve cavity 11 . After the stator assembly is energized, a magnetic field is generated, and the rotor 4 made of magnetic material rotates under the driving of the magnetic field. The electronic expansion valve also includes a connecting plate assembly 5, a screw 6 and a nut sleeve 7. The screw 6 and the rotor 4 are fixedly connected through the connecting plate assembly 5, and the rotation of the rotor 4 drives the screw 6 to rotate. The nut sleeve 7 is fixed on the valve body 1 , and the screw 6 and the nut sleeve 7 form a nut-screw fit. Therefore, the rotation of the screw 6 relative to the nut sleeve 7 will cause the screw 6 to produce a relative axial direction of the valve body 1 . sports. Thus, the stator assembly drives the rotor 4 to move, and the rotor 4 drives the screw 6 to move.

The electronic expansion valve also includes a limiter 8, the limiter 8 is used to limit the rotation angle of the rotor 4, and the limiter 8 includes a guide plate 81, a limit spring 82, a stop ring 83 and a stopper (not shown in the figure). ). The limit spring 82 is sleeved on the outer side of the nut seat, the stop ring 83 is sleeved on the limit spring 82 , and the stop ring 83 can perform a helical motion along the limit spring 82 . One end of the guide piece 81 is connected to the connecting plate assembly 5, the rotor 4 can drive the guide piece 81 to rotate synchronously through the connecting plate assembly 5, and the guide piece 81 can drive the stop ring 83 along the limit spring during the rotation process 82 performs a helical motion to control the opening of the electronic expansion valve. The stopper is disposed at both ends of the limit spring 82 , and the stopper prevents the movement of the stop ring 83 on the limit spring 82 to limit the maximum opening of the electronic expansion valve.

The electronic expansion valve further includes a valve head 9 connected to one end of the screw 6 away from the connecting plate assembly 5 . The telescopic motion of the screw 6 relative to the axial direction of the valve body 1 will drive the valve head 9 to move, and the valve head 9 moves relative to the valve port 12 opened on the valve body 1 under the driving of the screw 6 .

As shown in Figures 1-4, in the electronic expansion valve provided by the present application, the connecting plate assembly 5 includes a first connecting plate 51 and a second connecting plate 52, the first connecting plate 51 is fixedly connected to the rotor 4, and the second connecting plate 52 is fixedly connected Screw 6. The second connecting plate 52 is a metal part, the first connecting plate 51 is a plastic part, and the first connecting plate 51 is overmolded on the outer side of the second connecting plate 52 . The rotor 4 drives the screw 6 to rotate through the first connecting plate 51 and the second connecting plate 52 .

In this way, the first connecting plate 51 and the second connecting plate 52 can be processed separately, which greatly improves the processing flexibility of the first connecting plate 51 and the second connecting plate 52 . Moreover, the first connecting plate 51 is overmolded on the outside of the second connecting plate 52 , which also ensures that the second connecting plate 52 can be firmly connected to the first connecting plate 51 , so that the structure of the connecting plate assembly 5 is more stable. That is, the electronic expansion valve provided by the present application solves the common problem that the first connecting plate 51 and the second connecting plate 52 are not firmly connected.

In one embodiment, as shown in FIGS. 1-3 , the electronic expansion valve further includes a guide piece 81 , the guide piece 81 is a plastic part, and the guide piece 81 is integrally formed with the first connecting plate 51 . The integral molding structure ensures the stability of the structure between the first connecting plate 51 and the guide piece 81 , and the external force can be evenly dispersed when the guide piece 81 is subjected to external force, so that there is no stress concentration that causes the guide piece 81 to break Case. In addition, since the first connecting plate 51 and the guide plate 81 are integrally formed, the guide plate 81 and the first connecting plate 51 do not need to be connected by welding, that is, the welding steps are reduced, and the guide There is no connection gap between the moving piece 81 and the first connecting plate 51 . Therefore, compared with the welding connection method of the first connecting plate 51 and the guide piece 81, it is obvious that the connection method of the first connecting plate 51 and the guide piece 81 integrally formed is more firm, and the guide piece 81 will not be connected relative to the first piece. The plate 51 is deviated from the original position.

Further, the first connecting plate 51 and the guide piece 81 are injection-molded structures. The injection molding structure refers to the parts processed by the usual injection molding process, and the injection molding process is a molding method of injection and molding. At a certain temperature, the completely melted plastic material is stirred by a stirring device, and the plastic material is injected into the inner cavity of the mold by a pressure device, and the plastic material is cooled and solidified in the inner cavity of the mold to obtain an injection molding structure. The injection molding process is suitable for mass production of parts with complex shapes, and the injection molding process has fast production speed, high production efficiency and high processing accuracy. The injection-molded structure processed by the injection-molding process has the advantages of high precision and low manufacturing cost.

Optionally, the first connecting plate 51 is a thermoplastic engineering plastic part, and the guide piece 81 is a thermoplastic engineering plastic part. Engineering thermoplastics are a class of plastics with good heat resistance, cold resistance, machinability, structural stability, electrical insulation, chemical resistance, and adhesion. Therefore, the first connecting plate 51 and the guide plate 81 are thermoplastic engineering plastic parts, which can make the first connecting plate 51 and the guide plate 81 easier to process and form, and the connection between the first connecting plate 51 and the guide plate 81 is more firm. .

In one embodiment, as shown in FIGS. 2-4 , a side of the first connecting plate 51 away from the guide piece 81 is provided with an embedment portion 511 , and the embedment portion 511 is provided with a side facing away from the first connecting plate 51 . In the embedding groove 512 , the second connecting plate 52 is embedded in the embedding groove 512 . In this way, the second connecting plate 52 can be processed first, and then the second connecting plate 52 can be set in the mold, and the first connecting plate 51 can be processed by injection molding, and the second connecting plate 52 can be embedded in the first connecting plate 51 at the same time. inside plate 51. But not limited to this, the first connecting plate 51 and the second connecting plate 52 can also be processed separately, and then the second connecting plate 52 is embedded in the embedding groove 512 of the first connecting plate 51 by extrusion processing. However, no matter which way the first connecting plate 51 and the second connecting plate 52 are processed, the second connecting plate 52 is embedded in the embedding groove 512 of the first connecting plate 51, so that the first connecting plate 51 and the second connecting plate 51 are connected to each other. The plate 52 has a larger contact area, and at this time, the first connection plate 51 and the second connection plate 52 are closely connected, which is beneficial to the structural stability of the electronic expansion valve.

Further, as shown in FIGS. 2-4 , the inner wall of the embedding groove 512 is provided with a protrusion 513 , the outer peripheral side of the second connecting plate 52 is provided with a groove 521 corresponding to the protrusion 513 , and the protrusion 513 is clamped in the groove 521 inside, so that the second connecting plate 52 is clamped to the first connecting plate 51 . By providing protrusions 513 on the inner wall of the embedding groove 512 , grooves 521 are provided on the outer peripheral side of the second connecting plate 52 corresponding to the protrusions 513 , and the protrusions 513 are snapped into the grooves 521 . The contact area between the first connecting plate 51 and the second connecting plate 52 is further enlarged, so that the first connecting plate 51 and the second connecting plate 52 are connected more closely. In addition, the existence of the protrusion 513 and the groove 521 prevents the second connecting plate 52 from rotating relative to the first connecting plate 51, which further improves the structural stability of the electronic expansion valve.

Further, as shown in FIG. 4 , the number of grooves 521 is multiple, and the multiple grooves 521 are evenly distributed along the circumferential direction of the second connecting plate 52 . The number of the grooves 521 is set to be multiple, which can make the connection between the first connecting plate 51 and the second connecting plate 52 more firm, and the multiple grooves 521 are evenly distributed along the circumferential direction of the second connecting plate 52, which is beneficial to the grooves 521. processing and manufacturing.

In one embodiment, as shown in FIGS. 1-4 , the first connecting plate 51 and the second connecting plate 52 are both disc-shaped, and the center of the second connecting plate 52 is provided with a first through hole 522 . The center of the plate 51 is provided with a second through hole 514 . One end of the screw 6 passes through the second through hole 514 and the first through hole 522 in sequence, and the screw 6 is in clearance fit with the first through hole 522, and the screw 6 is in clearance fit with the second through hole 514, and the screw 6 is connected with the second through hole 522. Plate 52 is soldered. In this way, when the rotor 4 drives the first connecting plate 51 and the second connecting plate 52 to rotate, the screw 6 can be located at the center of rotation, preventing the screw 6 from being eccentric during the rotation process and affecting the opening and closing of the electronic expansion valve.

In one embodiment, the outer contour of the cross section of the first connecting plate 51 is non-circular. This arrangement is beneficial to further prevent the first connecting plate 51 and the rotor 4 from rotating relative to each other.

In one embodiment, the outer contour of the cross-section of the second connecting plate 52 is non-circular. This arrangement is beneficial to further prevent the first connecting plate 51 and the second connecting plate 52 from rotating relative to each other.

The technical features of the above-described embodiments can be combined arbitrarily. In order to simplify the description, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be regarded as the scope described in this specification.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present application, but not to limit the present application, as long as the above embodiments can be appropriately changed within the scope of the essential spirit of the present application and variations all fall within the scope of protection claimed in this application.

Claims

An electronic expansion valve, characterized in that it comprises a rotor, a screw, a first connecting plate and a second connecting plate, the first connecting plate is fixedly connected to the rotor, and the second connecting plate is fixedly connected to the screw;

The second connecting plate is a metal part, the first connecting plate is a plastic part, and the first connecting plate is overmolded on the outside of the second connecting plate; the rotor passes through the first connecting plate and the The second connecting plate drives the screw to rotate.
The electronic expansion valve according to claim 1, wherein the electronic expansion valve further comprises a guide piece, the guide piece is a plastic part, and the guide piece and the first connecting plate are integrally formed .
The electronic expansion valve according to claim 2, wherein the first connecting plate and the guide piece are injection molding structures.
The electronic expansion valve according to claim 2, wherein a side of the first connecting plate away from the guide piece is provided with an embedment portion, and the embedment portion faces a side facing away from the first connecting plate. One side is provided with an embedding groove, and the second connecting plate is embedded in the embedding groove.
The electronic expansion valve according to claim 4, wherein the inner wall of the embedding groove is provided with a protrusion, the outer peripheral side of the second connecting plate is provided with a groove corresponding to the protrusion, and the protrusion is provided with a groove. The second connection board is clamped in the groove, so that the second connection board is clamped with the first connection board.
The electronic expansion valve according to claim 5, wherein the number of the grooves is plural, and the plurality of the grooves are evenly distributed along the circumferential direction of the second connecting plate.
The electronic expansion valve according to claim 1, wherein the first connecting plate and the second connecting plate are both disc-shaped, and the center of the second connecting plate is provided with a first through hole, The center of the first connecting plate is provided with a second through hole; one end of the screw rod is successively penetrated through the second through hole and the first through hole, and the screw rod and the first through hole clearance fit, and clearance fit between the screw rod and the second through hole, and the screw rod and the second connection plate are welded and connected.
The electronic expansion valve according to claim 1, wherein the outer contour of the cross section of the first connecting plate is non-circular.
The electronic expansion valve according to claim 1, wherein the outer contour of the cross section of the second connecting plate is non-circular.
An air conditioner, characterized in that it comprises the electronic expansion valve according to any one of claims 1-9.