WO2023241114A1

WO2023241114A1 - Electronic expansion valve

Info

Publication number: WO2023241114A1
Application number: PCT/CN2023/079891
Authority: WO
Inventors: 邓岳忠; 王傅钢
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2022-06-16
Filing date: 2023-03-06
Publication date: 2023-12-21
Also published as: CN217736284U

Abstract

An electronic expansion valve, comprising: a valve seat assembly (10), wherein the valve seat assembly (10) comprises a valve seat (11) and a valve core seat (12) connected to each other, and the valve core seat (12) is provided with a circulation hole (121); a soft sealing gasket (20), wherein the soft sealing gasket (20) is located at the end of the valve core seat (12) facing the valve seat (11), the valve seat (11) and the valve core seat (12) are both in limiting fit with the soft sealing gasket (20), and the soft sealing gasket (20) is provided with a valve port (21) communicating with the circulation hole (121); a valve needle (30), wherein the valve needle (30) can be axially and movably arranged in the valve seat (11), so as to open or close the valve port (21), and when the valve needle (30) closes the valve port (21), the valve needle (30) abuts against the soft sealing gasket (20), and a distance is provided between the valve needle (30) and an inner wall of the valve core seat (12); and a driving assembly (40), wherein the driving assembly (40) comprises a screw rod (41) and a transition structure (42), the screw rod (41) is connected to the valve needle (30) by means of the transition structure (42), the screw rod (41) can rotate relative to the valve needle (30), and when the screw rod (41) moves axially, the valve needle (30) is also driven to move axially. The electronic expansion valve can solve the problem of the poor sealing effect of the electronic expansion valve in the prior art.

Description

Electronic expansion valve

This application requires priority for the patent application submitted to the China State Intellectual Property Office on June 16, 2022, with the application number 202221510246.X and the invention name "Electronic Expansion Valve".

Technical field

The present application relates to the technical field of electronic expansion valves, specifically, to an electronic expansion valve.

Background technique

Currently, in various types of refrigeration and heating equipment such as air conditioners, refrigerators, and heat pump water heaters, electronic expansion valves are usually used to regulate the flow of fluids. Electronic expansion valves are usually composed of valve seat components, valve needles and drive components. The movement of the valve needle is used to adjust the opening of the valve port to achieve flow control. Electronic expansion valves in the prior art usually use a metal valve needle and a metal valve core line sealing to prevent internal leakage. Due to factors such as the processing accuracy of accessories and the roughness of the metal surface, the internal leakage failure rate is high, which will cause the valve to fail. The sealing effect of the port is poor and fluid leakage is prone to occur.

Application content

This application provides an electronic expansion valve to solve the problem of poor sealing effect of the electronic expansion valve in the prior art.

In order to solve the above problems, this application provides an electronic expansion valve, including: a valve seat assembly, the valve seat assembly includes an interconnected valve seat and a valve core seat, the valve core seat has a flow hole; a soft sealing gasket, the soft sealing gasket is located The valve core seat faces one end of the valve seat. The valve seat and the valve core seat are limitedly matched with the soft sealing gasket. The soft sealing gasket has a valve port connected to the flow hole; the valve needle is axially movably set on the valve seat. to open or close the valve port, and when the valve needle closes the valve port, the valve needle and the soft sealing gasket are in contact and there is a gap between the valve needle and the inner wall of the valve core seat; the driving assembly includes a screw and a transition structure, the screw is connected to the valve needle through a transition structure, the screw can rotate relative to the valve needle, and when the screw moves axially, it drives the valve needle to move axially.

Further, when the valve needle closes the valve port, a part of the valve needle penetrates into the valve port, and the outer wall of the valve needle contacts the inner wall of the valve port.

Further, the inner wall of the valve port is straight or conical.

Further, the valve needle includes a main body section, a first cone section and a second cone section connected in sequence. The cone angle of the first cone section is greater than the cone angle of the second cone section. When the valve needle closes the valve port downward, the outer wall of the first tapered section is in contact with the inner wall of the valve port, and the second tapered section penetrates into the flow hole.

Further, one end of the valve core seat facing the valve seat has an installation groove, and the soft sealing gasket is located in the installation groove; or, one end of the valve seat facing the valve core seat has an installation groove, and the soft sealing gasket is located in the installation groove.

Furthermore, the inner wall of the valve seat has a positioning step, a part of the valve core seat penetrates into the positioning step, and the step surface of the positioning step abuts the side of the soft sealing gasket away from the valve core seat.

Further, the valve core seat includes a first annular cylinder, a second annular cylinder and a third annular cylinder connected in sequence, the diameters of the first annular cylinder, the second annular cylinder and the third annular cylinder increase in sequence, and the soft sealing gasket is located on the third annular cylinder. In an annular cylinder, the first annular cylinder penetrates into the positioning step, and the end surface of the second annular cylinder is in contact with the end surface of the valve seat.

Further, the transition structure includes a rotating member, a guide sleeve and an elastic member. The inner ring of the rotating member is connected to the screw, the outer ring of the rotating member is connected to the inner wall of the guide sleeve, and the end of the valve needle away from the valve port is limitedly matched with the guide sleeve. The elastic member is located in the guide sleeve and between the rotating member and the valve needle.

Further, the transition structure also includes a bushing and a limiting sleeve. The bushing is located in the guide sleeve and contacts the outer ring of the rotating member. The elastic member is set on the bushing. The limiting sleeve and the guide sleeve face one end of the valve port. Fixed connection, the valve needle passes through the limit sleeve, the valve needle has a limit ring, and both sides of the limit ring are in contact with the elastic member and the limit sleeve respectively.

Further, the side wall of the valve seat has an overflow hole, which communicates with the overflow hole when the valve port is open. The electronic expansion valve also includes a connecting seat, a valve tube and a driving part, and the valve seat and the valve tube are connected to the connecting seat. The overflow hole and the valve core seat are located on the side of the connecting seat away from the valve pipe. The driving part is arranged in the valve pipe, and the driving part drives the screw to move.

Applying the technical solution of this application, an electronic expansion valve is provided, including: a valve seat assembly, which includes an interconnected valve seat and a valve core seat, the valve core seat has a flow hole; a soft sealing gasket, the soft sealing gasket is located The valve core seat faces one end of the valve seat. The valve seat and the valve core seat are limitedly matched with the soft sealing gasket. The soft sealing gasket has a valve port connected to the flow hole; the valve needle is axially movably set on the valve seat. to open or close the valve port, and when the valve needle closes the valve port, the valve needle and the soft sealing gasket are in contact and there is a gap between the valve needle and the inner wall of the valve core seat; the driving assembly includes a screw and a transition structure, the screw is connected to the valve needle through a transition structure, the screw can rotate relative to the valve needle, and when the screw moves axially, it drives the valve needle to move axially. Using this solution, instead of using a metal valve needle and a metal valve core to seal through a mating line in the prior art, a soft sealing gasket is set at one end of the valve core seat facing the valve seat, and the valve seat and the valve core seat are All are matched with the soft sealing gasket limiter. The soft sealing gasket has a valve port connected to the flow hole. This arrangement further improves the sealing effect of the electronic expansion valve, effectively avoids fluid leakage, and also increases the service life of the electronic expansion valve; And because when the screw moves axially, it will rotate relative to the valve needle. In this solution, a transition structure is set up to connect the screw and the valve needle, so that when the screw moves axially, the valve needle will only move axially and will not rotate. , thus avoiding the problem of soft sealing gasket wear caused by valve needle rotation, thereby increasing the service life of the soft sealing gasket.

Description of the drawings

The description and drawings that constitute a part of this application are used to provide a further understanding of this application. The illustrative embodiments and their descriptions of this application are used to explain this application and do not constitute an improper limitation of this application. In the attached picture:

Figure 1 shows a cross-sectional view of an electronic expansion valve provided by an embodiment of the present application with a straight cylindrical valve port;

Figure 2 shows a partial enlarged view of the electronic expansion valve in Figure 1;

Figure 3 shows a cross-sectional view of the cone-shaped valve port of the electronic expansion valve provided by the embodiment of the present application;

FIG. 4 shows a partial enlarged view of the electronic expansion valve in FIG. 3 .

Among them, the above-mentioned drawings include the following reference signs:

10. Valve seat assembly; 11. Valve seat; 111. Positioning step; 112. Overflow hole; 12. Valve core seat; 121. Flow hole; 122. First annular cylinder; 123. Second annular cylinder; 124. three-ring cylinder;

20. Soft sealing gasket; 21. Valve port;

30. Valve needle; 31. Main body section; 32. First conical section; 33. Second conical section; 34. Limiting ring;

40. Driving component; 41. Screw; 42. Transition structure; 421. Rotating part; 422. Guide sleeve; 423. Elastic member; 424. Bushing; 425. Limit sleeve;

50. Connecting seat;

60. Valve tube;

70. Drive department.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

As shown in Figures 1 to 4, embodiments of the present application provide an electronic expansion valve, including: a valve seat assembly 10. The valve seat assembly 10 includes an interconnected valve seat 11 and a valve core seat 12. The valve core seat 12 It has a flow hole 121; a soft sealing gasket 20. The soft sealing gasket 20 is located at one end of the valve core seat 12 facing the valve seat 11. The valve seat 11 and the valve core seat 12 are limitedly matched with the soft sealing gasket 20. The soft sealing gasket 20 has and The valve port 21 communicated with the flow hole 121; the valve needle 30. The valve needle 30 is axially movably disposed in the valve seat 11 to open or close the valve port 21. When the valve needle 30 closes the valve port 21, the valve needle 30 30 is in contact with the soft sealing gasket 20 and there is a gap between the valve needle 30 and the inner wall of the valve core seat 12; the driving assembly 40 includes a screw rod 41 and a transition structure 42, and the screw rod 41 is connected to the valve needle 30 through the transition structure 42 , the screw rod 41 can rotate relative to the valve needle 30, and when the screw rod 41 moves axially, it drives the valve needle 30 to move axially.

Using this solution, instead of using the metal valve needle and the metal valve core to be sealed by mating lines in the prior art, the soft sealing gasket 20 is placed on one end of the valve core seat 12 facing the valve seat 11, and the valve seat 11 , the valve core seat 12 is limitedly matched with the soft sealing gasket 20, and the soft sealing gasket 20 has a valve port 21 connected with the flow hole 121. Such an arrangement further improves the sealing effect of the electronic expansion valve, effectively avoids fluid leakage, and at the same time also The service life of the electronic expansion valve is improved; and because the screw 41 rotates relative to the valve needle when it moves in the axial direction, in this solution, a transition structure 42 is provided to connect the screw 41 and the valve needle 30 so that the screw 41 moves in the axial direction. When the valve needle 30 rotates, the valve needle 30 will only move axially and will not rotate. Therefore, the problem of the soft sealing gasket 20 being worn due to the rotation of the valve needle 30 is avoided, thereby increasing the service life of the soft sealing gasket 20 . Among them, soft seal The pad 20 is made of soft material, such as non-metal material or soft metal material. Preferably, a material that is both wear-resistant and has a material hardness lower than that of the valve needle 30 and the valve core seat 12 is used. In this solution, the material of the soft sealing gasket 20 can be rubber or plastic.

When the valve needle 30 closes the valve port 21, a part of the valve needle 30 penetrates into the valve port 21, and the outer wall of the valve needle 30 contacts the inner wall of the valve port 21. This arrangement achieves a sealing method in which the valve needle 30 and the soft sealing gasket 20 cooperate. The soft sealing method is used to further improve the sealing effect of the electronic expansion valve and effectively avoid fluid leakage.

As shown in Figures 1 and 2, the inner wall of the valve port 21 is straight-cylindrical. The inner wall of the valve port 21 is set into a straight cylinder, so that when the valve needle 30 closes the valve port 21, the seal between the valve needle 30 and the valve port 21 is a linear seal. The linear sealing method is used to ensure the sealing effect, thereby effectively Fluid leakage is avoided.

Alternatively, as shown in Figures 3 and 4, the inner wall of the valve port 21 is cone-shaped. The inner wall of the valve port 21 is set into a cone shape, so that when the valve needle 30 closes the valve port 21, the seal between the valve needle 30 and the valve port 21 is a face seal. The face seal is used to further ensure the sealing effect. This effectively avoids fluid leakage. Among them, the end surface or the inner wall surface of the soft sealing gasket 20 forms a contact surface. When the soft sealing gasket 20 uses the inner wall surface as the contact surface, the inner wall of the soft sealing gasket 20 can be set as a single section structure with the same slope or with different slopes. When the inner wall of the soft sealing gasket 20 is formed into a multi-section structure, one of the conical surfaces in the multi-section structure in the inner wall forms a contact surface for contacting the valve needle 30 when closing the valve port 21 .

In this embodiment, the valve needle 30 includes a main body section 31, a first cone section 32 and a second cone section 33 connected in sequence. The cone angle of the first cone section 32 is greater than the cone angle of the second cone section 33. , when the valve needle 30 closes the valve port 21 , the outer wall of the first tapered section 32 contacts the inner wall of the valve port 21 , and the second tapered section 33 penetrates into the flow hole 121 . The first cone section 32 and the second cone section 33 are provided, and the cone angle of the first cone section 32 is greater than the cone angle of the second cone section 33, so that when the valve needle 30 closes the valve port 21, the second cone The shaped section 33 penetrates into the flow hole 121, so that the outer wall of the first tapered section 32 and the inner wall of the valve port 21 are in contact, thereby closing the valve port 21; and such an arrangement can also adapt to valve ports 21 of different apertures, Improved the versatility of the electronic expansion valve.

Specifically, the valve core seat 12 has an installation groove at one end facing the valve seat 11, and the soft sealing gasket 20 is located in the installation groove; or, the valve seat 11 has an installation groove at one end facing the valve core seat 12, and the soft sealing gasket 20 is located in the installation groove. . The soft sealing gasket 20 is arranged in the installation groove, and the installation groove can limit the soft sealing gasket 20 to prevent the soft sealing gasket 20 from falling off, ensuring the stability and reliability of the sealing effect of the electronic expansion valve. The installation groove can be provided on the valve core seat 12; or, it can be provided on the valve seat 11.

In this embodiment, the inner wall of the valve seat 11 has a positioning step 111 , a part of the valve core seat 12 penetrates into the positioning step 111 , and the stepped surface of the positioning step 111 abuts the side of the soft sealing gasket 20 away from the valve core seat 12 . The positioning step 111 is provided so that when the valve core seat 12 penetrates into the valve seat 11, the positioning step 111 can position the valve core seat 12, thereby limiting the insertion depth of the valve core seat 12; at the same time, it can also contact the soft sealing gasket 20 The side away from the valve core seat 12 is in contact to further ensure that the soft sealing gasket 20 will not fall off.

Wherein, the valve core seat 12 includes a first annular cylinder 122, a second annular cylinder 123 and a third annular cylinder 124 connected in sequence. The diameters of the first annular cylinder 122, the second annular cylinder 123 and the third annular cylinder 124 increase in sequence. , the soft sealing gasket 20 is located in the first annular cylinder 122, the first annular cylinder 122 penetrates into the positioning step 111, and the end surface of the second annular cylinder 123 is in contact with the end surface of the valve seat 11. Using the above arrangement method, the soft sealing gasket 20 is arranged in the first annular cylinder 122, ensuring that the soft sealing gasket 20 It will not fall off; the end surface of the second annular cylinder 123 is in contact with the end surface of the valve seat 11, so that the end surface of the second annular cylinder 123 can limit the end surface of the valve seat 11. The flow hole 121 in the valve core seat 12 is provided through the valve core seat 12. The flow hole 121 is set as a trumpet hole with an increasingly larger diameter in the direction away from the valve needle 30 or a cylindrical hole with an equal diameter; the minimum diameter of the flow hole 121 is set to It is equal to the minimum inner diameter of the soft sealing gasket 20 to facilitate supporting the soft sealing gasket 20 while preventing the valve port 21 from being throttled.

Specifically, the transition structure 42 includes a rotating member 421, a guide sleeve 422 and an elastic member 423. The inner ring of the rotating member 421 is connected to the screw 41, the outer ring of the rotating member 421 is in clearance fit with the inner wall of the guide sleeve 422, and the valve needle 30 is away from the valve. One end of the port 21 is limitedly matched with the guide sleeve 422 , the elastic member 423 is located in the guide sleeve 422 , and the elastic member 423 is located between the rotating member 421 and the valve needle 30 . Through the above connection method, when the screw 41 moves in the axial direction, it will rotate relative to the valve needle. Through the clearance fit between the outer ring of the rotating member 421 and the inner wall of the guide sleeve 422, the end of the valve needle 30 away from the valve port 21 is limited by the guide sleeve 422. Cooperating with each other, the screw 41 drives the valve needle 30 to move axially without rotating, thereby avoiding the problem of the soft sealing gasket 20 being worn due to the rotation of the valve needle 30, thereby increasing the service life of the soft sealing gasket 20. The guide sleeve 422 is provided to guide the movement of the valve needle 30 . Among them, the rotating member 421 is preferably a rotating member.

Among them, the transition structure 42 also includes a bushing 424 and a limiting sleeve 425. The bushing 424 is located in the guide sleeve 422 and contacts the outer ring of the rotating member 421. The elastic member 423 is set on the bushing 424, and the limiting sleeve 425 It is fixedly connected to one end of the guide sleeve 422 facing the valve port 21. The valve needle 30 passes through the limit sleeve 425. The valve needle 30 has a limit ring 34. Both sides of the limit ring 34 are respectively in contact with the elastic member 423 and the limit sleeve 425. catch. A bushing 424 is provided, and the bushing 424 is arranged in the guide sleeve 422 and contacts the outer ring of the rotating member 421. This can not only limit the position of the rotating member 421, but also ensure the stability of the elastic member 423 during operation. A limit sleeve 425 is provided to limit the valve needle 30 and prevent the valve needle 30 from shaking; a limit ring 34 is provided, and both sides of the limit ring 34 are in contact with the elastic member 423 and the limit sleeve 425 respectively. , which further ensures the stability of the valve needle 30 when moving.

Specifically, the side wall of the valve seat 11 has an overflow hole 112, which communicates with the overflow hole 112 when the valve port 21 is open. The electronic expansion valve also includes a connecting seat 50, a valve tube 60 and a driving part 70. The valve seat 11 and The valve tube 60 is connected to the connecting seat 50 , and the overflow hole 112 and the valve core seat 12 are located on the side of the connecting seat 50 away from the valve tube 60 . The driving part 70 is disposed in the valve tube 60 , and the driving part 70 drives the screw 41 to move. An overflow hole 112 is provided. When the valve port 21 is opened, the valve port 21 and the overflow hole 112 are connected, thereby realizing the circulation function of the electronic expansion valve; a connecting seat 50 is provided to facilitate connection with the external structure; a valve tube 60 is provided to enable It protects the internal structure of the electronic expansion valve; the driving part 70 is provided to drive the screw 41 to move, thereby realizing the on-off function of the electronic expansion valve.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

An electronic expansion valve, characterized by including:

Valve seat assembly (10), the valve seat assembly (10) includes an interconnected valve seat (11) and a valve core seat (12), the valve core seat (12) has a flow hole (121);

Soft sealing gasket (20), the soft sealing gasket (20) is located at one end of the valve core seat (12) facing the valve seat (11), the valve seat (11), the valve core seat (12) ) are limitedly matched with the soft sealing gasket (20), and the soft sealing gasket (20) has a valve port (21) connected with the flow hole (121);

Valve needle (30), the valve needle (30) is axially movably arranged in the valve seat (11) to open or close the valve port (21), and the valve needle (30) is closed In the case of the valve port (21), the valve needle (30) and the soft sealing gasket (20) are in contact with each other, and there is a gap between the valve needle (30) and the inner wall of the valve core seat (12). have spacing;

Driving assembly (40), the driving assembly (40) includes a screw (41) and a transition structure (42), the screw (41) is connected to the valve needle (30) through the transition structure (42), so The screw (41) can rotate relative to the valve needle (30), and when the screw (41) moves axially, it drives the valve needle (30) to move axially.
The electronic expansion valve according to claim 1, characterized in that when the valve needle (30) closes the valve port (21), a part of the valve needle (30) penetrates the valve port. (21), the outer wall of the valve needle (30) is in contact with the inner wall of the valve port (21).
The electronic expansion valve according to claim 2, characterized in that the inner wall of the valve port (21) is straight or conical.
The electronic expansion valve according to claim 2, characterized in that the valve needle (30) includes a main body section (31), a first cone section (32) and a second cone section (33) connected in sequence, The cone angle of the first cone section (32) is greater than the cone angle of the second cone section (33). When the valve needle (30) closes the valve port (21), the The outer wall of the first tapered section (32) is in contact with the inner wall of the valve port (21), and the second tapered section (33) penetrates into the flow hole (121).
The electronic expansion valve according to claim 1, characterized in that the valve core seat (12) has an installation groove at one end facing the valve seat (11), and the soft sealing gasket (20) is located in the installation groove. Inside;

Alternatively, the valve seat (11) has an installation groove at one end facing the valve core seat (12), and the soft sealing gasket (20) is located in the installation groove.
The electronic expansion valve according to claim 1, characterized in that the inner wall of the valve seat (11) has a positioning step (111), and a part of the valve core seat (12) penetrates the positioning step (111) Inside, the step surface of the positioning step (111) is in contact with the side of the soft sealing gasket (20) away from the valve core seat (12).
The electronic expansion valve according to claim 6, characterized in that the valve core seat (12) includes a first annular cylinder (122), a second annular cylinder (123) and a third annular cylinder (124) connected in sequence. , the diameters of the first annular cylinder (122), the second annular cylinder (123) and the third annular cylinder (124) increase in sequence, and the soft sealing gasket (20) Located in the first annular cylinder (122), the first annular cylinder (122) penetrates into the positioning step (111), the end surface of the second annular cylinder (123) and the valve seat (11 ) end faces are in contact.
The electronic expansion valve according to claim 1, characterized in that the transition structure (42) includes a rotating member (421), a guide sleeve (422) and an elastic member (423), and the inner part of the rotating member (421) The ring is connected to the screw (41), the outer ring of the rotating member (421) is in clearance fit with the inner wall of the guide sleeve (422), and the end of the valve needle (30) away from the valve port (21) The elastic member (423) is located in the guide sleeve (422), and the elastic member (423) is located between the rotating member (421) and the valve needle. (30).
The electronic expansion valve according to claim 8, characterized in that the transition structure (42) further includes a bushing (424) and a limiting sleeve (425), the bushing (424) is located in the guide sleeve (424) 422) and in contact with the outer ring of the rotating member (421), the elastic member (423) is sleeved on the bushing (424), the limiting sleeve (425) and the guide sleeve (422) is fixedly connected toward one end of the valve port (21), the valve needle (30) passes through the limiting sleeve (425), and the valve needle (30) has a limiting ring (34), so Both sides of the limiting ring (34) are in contact with the elastic member (423) and the limiting sleeve (425) respectively.
The electronic expansion valve according to claim 1, characterized in that the side wall of the valve seat (11) has an overflow hole (112), and when the valve port (21) is open, the overflow hole (112), the electronic expansion valve also includes a connecting seat (50), a valve tube (60) and a driving part (70), and the valve seat (11) and the valve tube (60) are both connected to the The overflow hole (112) and the valve core seat (12) are both located on the side of the connecting seat (50) away from the valve tube (60), and the driving part (70) ) is arranged in the valve tube (60), and the driving part (70) drives the screw (41) to move.