Valve device

Abstract

According to the technical scheme, according to the valve device, the sealing piece is connected with the valve element body, the hardness of the sealing piece is smaller than that of the valve element body, and the machining difficulty of the balance channel on the sealing piece is lower than that of the balance channel on the valve element body; the balance channel can be directly processed on the sealing element with lower hardness, so that the processing difficulty of the balance channel is reduced; if one part of the balance channel is located on the sealing piece and the other part of the balance channel is located on the valve element body, on one hand, the sealing piece and the valve element body can be manufactured separately, namely, the balance channel is divided into two sections to be manufactured separately, and the machining difficulty is lower than that of a product with the balance channel completely located on the valve element body; on the other hand, the length of the balance channel located in the valve element body can be shortened, and the machining difficulty of the balance channel is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal management, in particular to a valve device for vehicles. BACKGROUND

[0002] In the related art, the first valve core assembly of the valve device includes a valve core body and a sealing element, the cavities on the two axial sides of the first valve core assembly are relatively not communicated when the valve device is in a closed valve state, when the pressure of the working medium on one axial side of the first valve core assembly is relatively large, the high-pressure working medium exerts a relatively large axial force on the first valve core assembly, which is not conducive to the smooth operation of the valve needle assembly, and in the related art, a long channel is machined on the metal valve core body to communicate the cavities on the two axial sides to balance the pressure on the two axial sides, but since the long channel is difficult to machine, how to reduce the machining difficulty of the balancing hole has been a research topic for those skilled in the art. CONTENT OF THE UTILITY MODEL

[0003] An object of the present application is to provide a valve device that facilitates reducing the machining difficulty.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] A valve device includes a valve seat and a valve core assembly, the valve core assembly includes a first valve core assembly and a second valve core assembly, the first valve core assembly has a containing cavity, and at least part of the second valve core assembly is located in the containing cavity; the valve seat has a first hole and a first valve port, the first hole can be communicated with the first valve port, and the containing cavity and the first hole are located on different sides of the first valve core assembly; the first valve core assembly includes a valve core body and a sealing element, the valve core body is connected with the sealing element, the sealing element has a second valve port, and the second valve core assembly can block the second valve port; the first valve core assembly has a balancing channel, the balancing channel is communicated with the containing cavity, the balancing channel is communicated with the first hole when the valve device is in a closed valve state, and at least part of the balancing channel is located in the sealing element; the hardness of the sealing element is less than the hardness of the valve core body.

[0006] In the technical solution of the application, the sealing member is connected with the valve core body, and because the hardness of the sealing member is less than the hardness of the valve core body, the machining difficulty of the balance channel on the sealing member is lower than the machining difficulty of the balance channel on the valve core body, compared with the scheme of machining the entire balance channel on the valve core body, if the balance channel is completely located on the sealing member, the balance channel can be directly machined on the sealing member with smaller hardness, so that the machining difficulty of the balance channel is reduced, if part of the balance channel is located on the sealing member and the other part of the balance channel is located on the valve core body, on the one hand, the sealing member can be manufactured separately from the valve core body, that is, the balance channel can be divided into two sections for separate manufacturing, which is lower in machining difficulty than the product with the balance channel completely located on the valve core body, on the other hand, the length of the balance channel located on the valve core body can be shortened, and the machining difficulty of the balance channel is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 An exploded view of the valve device is shown;

[0008] Figure 2 An exploded view of the valve device is shown; Figure 1 A sectional view of an embodiment of the valve device is shown;

[0009] Figure 3 An exploded view of the valve device is shown; Figure 2 An enlarged view of the valve device is shown;

[0010] Figure 4 An exploded view of the valve device is shown; Figure 2 A sectional view of an embodiment of the valve core assembly is shown;

[0011] Figure 5 An exploded view of the valve device is shown; Figure 4 An exploded view of an embodiment of the valve core assembly is shown at an angle;

[0012] Figure 6 An exploded view of the valve device is shown; Figure 5 An exploded view of an embodiment of the valve core assembly is shown at an angle;

[0013] Figure 7 An exploded view of the valve device is shown; Figure 5 A sectional view of an embodiment of the valve core assembly is shown;

[0014] Figure 8 An exploded view of the valve device is shown; Figure 5 A sectional view of an embodiment of the valve core assembly is shown at an angle;

[0015] Figure 9 An exploded view of the valve device is shown; Figure 5 A sectional view of an embodiment of the valve core assembly is shown at an angle;

[0016] 1000, valve device; 101, valve seat; 102, valve core assembly; 103, flow passage; 104, containing cavity; 105, first valve port; 106, first hole; 1, first valve core assembly; 2, second valve core assembly; 11, valve core body; 12, sealing element; 13, balance passage; 111, mounting portion; 112, small diameter portion; 113, large diameter portion; 114, end face portion; 115, first opening; 121, second valve port; 131, first balance hole; 132, second balance hole; 1111, extension portion; 1112, main body portion; 1113, concave portion; 1114, avoiding cavity. DETAILED DESCRIPTION

[0017] The embodiments will be described in detail below with reference to the drawings.

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in further detail below with reference to the drawings and specific embodiments. In this article, the relationship terms such as "first" and "second" are only used to distinguish one part from another part with the same name, and do not necessarily require or imply any actual relationship or order between the parts. It should be noted that the connection in the present application includes fixed connection and limiting connection, the "limiting connection" in the present application includes hinging, clamping, etc., and the "fixed connection" in the present application includes welding, bonding, vulcanization fixing, riveting, insert molding, etc.

[0019] The valve device 1000 can be applied to a vehicle thermal management system or an air conditioning system, especially to a circulating system using CO2 as refrigerant, wherein the vehicle thermal management system includes a new energy vehicle thermal management system, and in the vehicle thermal management system, the valve device 1000 is often used as a throttling element or a switching element.

[0020] As shown in Figures 1-2 A valve device 1000 includes a valve seat 101 and a valve core assembly 102, the valve seat 101 has a flow passage 103, at least part of the valve core assembly 102 is located in the flow passage 103, the valve core assembly 102 includes a first valve core assembly 1 and a second valve core assembly 2, the first valve core assembly 1 can adjust the opening degree of a first valve port 105, the first valve core assembly 1 has a second valve port 121, the second valve core assembly 2 can adjust the opening degree of the second valve port 121; in a small flow state, the first valve core assembly 1 blocks the first valve port 105, and the second valve core assembly 2 opens the second valve port 121; in a large flow state, the first valve core assembly 1 opens the second valve port 121 while the second valve core assembly 2 keeps opening the second valve port 121. As shown in Figures 1-3As shown, the valve seat 101 has a first channel 106 which can be in communication with the first valve port 105, and the fluid flowing into the valve seat 101 enters the flow cavity 103 and contacts the valve core assembly 102; the first valve core assembly 1 has a containing cavity 104, and at least part of the second valve core assembly 2 is located in the containing cavity 104; in a small flow state, the fluid flows from the flow cavity 103 into the containing cavity 104 and then flows out of the first valve core assembly 1 into the first channel 106; in a large flow state, the valve core assembly 102 is opened as a whole, and the fluid flows out of the first channel 106. When the valve device 1000 is in a closed valve state, the containing cavity 104 and the flow cavity 103 on the two axial sides of the valve core assembly 102 are relatively not in communication, and when the working medium pressure on one axial side of the valve core assembly 102 is relatively large, the high-pressure working medium exerts a relatively large axial force on the valve core assembly 102, which is not conducive to the stable operation of the valve core assembly 102. Therefore, the first valve core assembly 1 of the present scheme has a balance channel 13 which communicates the flow cavity 103 and the containing cavity 104, and the working medium in the flow cavity 103 can enter the containing cavity 104 through the balance channel 13, which is conducive to reducing or eliminating the pressure difference between the two axial ends of the valve core assembly 102, thereby facilitating the stable operation of the valve core assembly 102; as Figures 1-4 As shown, the first valve core assembly 1 of the present scheme includes a valve core body 11 and a sealing member 12, the valve core body 11 is connected with the sealing member 12, the valve seat 101 has a first valve port 105, the sealing member 12 has a second valve port 121, the second valve core assembly 2 is located inside the first valve core assembly 1, and the second valve core assembly 2 can seal the second valve port 121; in order to ensure the sealing performance in a closed valve state, the skilled in the art usually improves the sealing effect by arranging a sealing member on the valve seat or the valve core.

[0021] At least part of the sealing member 12 is away from the second valve port 121 relative to the balance channel 13, and when the valve device 1000 is in a closed valve state, the sealing member 12 abuts against the wall forming the first valve port 105, which is conducive to improving the sealing performance in the closed valve state.

[0022] Since the valve has two valve ports, those skilled in the art usually set two sealing members on the first valve core assembly respectively for sealing the two valve ports. The present application designs a sealing member 12, which is an integral structure, and can cooperate with the second valve core assembly 2 to realize the sealing function, and also can cooperate with the valve seat 101 to realize the sealing function, thereby simplifying the structure of the parts. The first valve core assembly 1 has a balance channel 13, which is in communication with the containing cavity 104. When the valve device 1000 is in a closed valve state, the second valve port 121 is not in communication with the first hole 106, the first valve port 105 is not in communication with the first hole 106, and the balance channel 13 is in communication with the first hole 106, and at least part of the balance channel 13 is located in the sealing member 12. In the prior art, the containing cavity 104 and the first hole 106 are located on different sides of the valve core assembly 102. In order to realize the pressure balance of both ends of the valve core assembly 102, the balance channel 13 is arranged on the valve core body 11 of the first valve core assembly 1, and in order to enhance the sealing effect, the sealing member 12 is usually arranged at the end of the valve core body 11 in contact with the valve seat 101. However, the inventors found during research that when the balance channel 13 is arranged on the valve core body 11, since the valve core body 11 is usually made of metal materials such as stainless steel, the balance channel 13 is usually machined, and it is difficult to machine an elongated balance hole on the valve core body 11. Therefore, at least part of the balance channel 13 is located in the sealing member 12 in the present application, the hardness of the sealing member 12 is less than that of the valve core body 11, the balance channel 13 is in communication with the first hole 106 and the containing cavity 104, and if the balance channel 13 is completely located in the sealing member 12, the balance channel 13 can be directly machined on the sealing member 12 with smaller hardness, thereby reducing the machining difficulty of the balance channel 13. It should be noted that the machining methods include but are not limited to machining, injection molding and the like. If part of the balance channel 13 is located in the sealing member 12 and the other part of the balance channel 13 is located in the valve core body 11, on the one hand, the sealing member 12 can be manufactured separately with the valve core body 11, that is, the balance channel 13 can be divided into two parts for separate manufacturing, which is lower in machining difficulty than the product with the balance channel 13 completely located in the valve core body 11; on the other hand, the length of the balance channel located in the valve core body 11 can be shortened, thereby reducing the machining difficulty of the balance channel 13. Furthermore, at least part of the balance channel 13 is located in the sealing member 12, which is more close to the second valve port 121 compared with the scheme in which the balance channel 13 is located only in the valve core body 11, and is conducive to reducing the radial size of the valve core assembly 102, thereby making the valve structure more compact.

[0023] Further, as Figures 5-8As shown, the valve core body 11 includes a mounting portion 111 located at one end of the valve core body 11 close to the first valve port 105, and the mounting portion 111 is connected or fixedly connected with the sealing member 12. By arranging the mounting portion 111 at one end of the valve core body 11, compared with the mode that the valve core body 11 is directly connected with the sealing member 12, the present scheme increases the contact area of the valve core body 11 and the sealing member 12, which is beneficial to reduce the leakage between the valve core body 11 and the sealing member 12.

[0024] Further, as shown in the drawings, Figures 5-8 As shown, the mounting portion 111 includes an extension portion 1111 and a main body portion 1112, the extension portion 1111 extends outward from the circumferential outer wall of the main body portion 1112, and / or the extension portion 1111 extends inward from the circumferential inner wall of the main body portion 1112, which increases the contact area of the mounting portion 111 and the sealing member 12, and is beneficial to reduce the leakage between the mounting portion 111 and the sealing member 12; the extension portion 1111 is connected to one end of the main body portion 1112 close to the first valve port 105, the sealing member 12 is connected with the extension portion 1111, and the sealing member 12 can seal the first valve port 105.

[0025] As shown in the drawings, Figures 5-8 As shown, the valve core body 11 includes an end face portion 114 located at one end face of the valve core body 11 close to the first valve port 105, the mounting portion 111 protrudes from the end face portion 114, at least part of the sealing member 12 is connected with the extension portion 1111 on one side and the end face portion 114 on the other side, and at least part of the sealing member 12 is located between the extension portion 1111 and the end face portion 114. At least part of the sealing member 12 is located between the extended extension portion 1111 and the end face portion 114 of the valve core body 11, and the extension portion 1111 and the end face portion 114 on both sides clamp the sealing member 12, which plays a limiting role on the sealing member 12, and increases the contact area of the mounting portion 111 and the sealing member 12, which is beneficial to reduce the leakage between the mounting portion 111 and the sealing member 12.

[0026] The sealing member 12 is of an integral structure, and the sealing member 12 is fixed by insert injection molding with the mounting portion 111. The material of the sealing member 12 includes plastic or rubber, which has a lower cost and a simpler process.

[0027] As shown in the drawings, Figures 5-9As shown, in another technical solution of the present application, at least part of the balance channel 13 is located in the valve core body 11, the valve core body 11 has a first balance hole 131 extending along the axial direction of the valve core assembly 102, and the first balance hole 131 forms part of the balance channel 13; the sealing element 12 has a second balance hole 132 extending along the axial direction of the valve core assembly 102 from the end of the sealing element 12 close to the valve core body 11, and the second balance hole 132 has an opening on the side of the sealing element 12 close to the first valve port 105, and the first balance hole 131 and the second balance hole 132 form at least part of the balance channel 13. When part of the balance channel 13 is located in the sealing element 12 and the other part of the balance channel 13 is located in the valve core body 11, on the one hand, the sealing element 12 can be manufactured separately from the valve core body 11, that is, the balance channel 13 can be divided into two sections for separate manufacturing, and the processing difficulty of the product is lower than that of the product with the balance channel 13 completely located in the valve core body 11.

[0028] The valve core body 11 includes an end face portion 114 located at the end face of the valve core body 11 close to the first valve port 105, the first balance hole 131 has a first opening 115 at the end face portion 114 of the valve core body 11 close to the first valve port 105, and the projection of the mounting portion 111 on the reference plane does not overlap the projection of the first opening 115 on the reference plane, so as to avoid the mounting portion 111 blocking the outlet of the first balance hole 131.

[0029] During the research, the inventor found that, in order to facilitate processing, the first balance hole 131 is first processed on the valve core body 11, a plug rod is inserted into the first balance hole 131, the plug rod extends out of the valve core body 11, and then the valve core body 11 is injection molded, the mounting portion 111 is used as an insert for injection molding and fixing, after molding, the plug rod is removed, at this time, the sealing element 12 formed by injection molding has the second balance hole 132, the first balance hole 131 and the second balance hole 132 are connected, that is, the balance channel 13 connecting the first hole channel 106 and the containing cavity 104 is formed, therefore, the projection of the mounting portion 111 on the reference plane does not overlap the projection of the first opening 115 on the reference plane, so as to avoid the mounting portion 111 blocking the outlet of the first balance hole 131, and facilitate reducing the processing difficulty.

[0030] And the inventor found in the research process that in order to ensure the strength of the embedded part, the mounting part 111 with the extension part 1111 needs to be clamped and embedded with the sealing part 12, so the sealing part 12 needs to leave space for the mounting part 111, and also needs to leave space for the second balance hole 132, and the volume of the valve core body 11 is small, the distance between the space occupied by the mounting part 111 and the second balance hole 132 on the sealing part 12 is close, which will cause the thickness of the injection molding material between the mounting part 111 and the second balance hole 132 to be small during injection molding, and the structure is prone to breakage. In order to avoid the mounting part 111 being too close to the balance channel 13, the mounting part 111 of the present scheme includes a concave part 1113, the outer edge of the mounting part 111 is inwardly recessed to form the concave part 1113, specifically, the distance between the concave part 1113 and the hole wall of the second balance hole 132 is greater than 0.6mm, and the mounting part 11 has at least 0.6mm wall thickness of injection molding material between the second balance hole 132, which reduces the probability of structure breakage.

[0031] As shown in Figures 5-9 , the outer edge of the mounting part 111 is inwardly recessed to form the concave part 1113, and the concave part 1113 defines an avoiding cavity 1114, which communicates with the balance channel 13. The structure that the concave part 1113 is recessed inwardly from the outer edge of the mounting part 111 facilitates processing, reduces processing difficulty, and can leave space for avoiding between the balance channel 13 and the mounting part 111.

[0032] As shown in Figure 8 , the valve core body 11 includes a small-diameter part 112 and a large-diameter part 113, the small-diameter part 112 is away from the sealing part 12 relative to the large-diameter part 113, and the outer diameter of the small-diameter part 112 is smaller than that of the large-diameter part 113. The inventor found in the research process that the small-diameter part 112 is in contact with the valve seat 101, and the outer surface of the small-diameter part 112 needs to have a small roughness, which can easily cause fluid leakage from the small-diameter part 112 when the outer surface of the small-diameter part 112 is worn, so it is necessary to reduce the wear of the small-diameter part 112, and thus the outer diameter of the small-diameter part 112 is smaller than that of the large-diameter part 113, which reduces the friction between the small-diameter part 112 and the valve seat 101; and the small-diameter part 112 is separated from the outer surface of the valve core body 11 during injection molding of the sealing part 12, reducing the outer diameter of the small-diameter part 112, and the outer diameter of the large-diameter part 113 is greater than that of the small-diameter part 112, which can reduce the wear of the small-diameter part 112 during demolding.

[0033] As shown in Figures 5-9 , the first valve core assembly 1 has a plurality of balance channels 13, which are uniformly distributed along the circumference of the mounting part 111, and the plurality of uniformly distributed balance channels 13 are beneficial to the pressure balance of the two sides of the valve core assembly 102, thereby facilitating the smooth operation of the valve core assembly 102.

[0034] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. A valve device, characterized by The valve device (1000) comprises a valve seat (101) and a valve core assembly (102), the valve core assembly (102) comprises a first valve core assembly (1) and a second valve core assembly (2), the first valve core assembly (1) has a containing cavity (104), at least part of the second valve core assembly (2) is located in the containing cavity (104); the valve seat (101) has a first hole (106) and a first valve port (105), the first hole (106) can communicate with the first valve port (105), the containing cavity (104) and the first hole (106) are located at different sides of the first valve core assembly (1); The first valve core assembly (1) comprises a valve core body (11) and a sealing element (12), the valve core body (11) is connected with the sealing element (12), the sealing element (12) has a second valve port (121), the second valve core assembly (2) can block the second valve port (121); The first valve core assembly (1) has a balance channel (13), the balance channel (13) communicates with the containing cavity (104), when the valve device (1000) is in a closed valve state, the balance channel (13) communicates with the first hole (106), at least part of the balance channel (13) is located in the sealing element (12); the hardness of the sealing element (12) is less than the hardness of the valve core body (11).

2. A valve device according to claim 1, characterised in that The valve core body (11) has a first balance hole (131), the first balance hole (131) forms part of the balance channel (13); the sealing element (12) has a second balance hole (132), the second balance hole (132) has an opening on the side of the sealing element (12) close to the first valve port (105), the first balance hole (131) and the second balance hole (132) form at least part of the balance channel (13).

3. A valve device according to claim 2, wherein At least part of the sealing element (12) is away from the second valve port (121) relative to the balance channel (13), when the valve device (1000) is in a closed valve state, the sealing element (12) abuts against the wall forming the first valve port (105).

4. A valve device according to claim 2 or 3, characterised in that The valve core body (11) comprises a mounting portion (111), the mounting portion (111) is located at one end of the valve core body (11) close to the first valve port (105), the mounting portion (111) is limitingly connected or fixedly connected with the sealing element (12).

5. A valve device according to claim 4, wherein The mounting portion (111) comprises an extension portion (1111) and a main body portion (1112), the extension portion (1111) extends outward from the circumferential outer wall of the main body portion (1112), and / or the extension portion (1111) extends inward from the circumferential inner wall of the main body portion (1112); The extension portion (1111) is connected to one end of the main body portion (1112) close to the first valve port (105).

6. A valve device according to claim 5, wherein The valve core body (11) includes an end face part (114) located at one end of the valve core body (11) close to the first valve port (105), and the mounting part (111) protrudes from the end face part (114), and at least part of the sealing element (12) is located between the extension part (1111) and the end face part (114).

7. A valve device according to claim 5 or 6, characterised in that The sealing element (12) is of an integral structure, and the sealing element (12) is fixed by insert injection molding with the mounting part (111), and the material of the sealing element (12) includes plastic or rubber.

8. A valve device according to claim 7, characterised in that The valve core body (11) includes an end face part (114) and a mounting part (111), the end face part (114) is located at one end of the valve core body (11) close to the first valve port (105), the first balance hole (131) extends along the axial direction of the valve core assembly (102), and the first balance hole (131) has a first opening (115) at the end face part (114) of the valve core body (11) close to the first valve port (105); a reference plane is defined as the plane where the end face part (114) is located, and the projection of the mounting part (111) on the reference plane does not overlap with the projection of the first opening (115) on the reference plane.

9. A valve device according to claim 8, wherein The mounting part (111) includes a concave part (1113), the outer edge of the mounting part (111) is inwardly recessed to form the concave part (1113), and the distance between the concave part (1113) and the hole wall of the second balance hole (132) is greater than 0.6mm.

10. A valve device according to any of claims 1-3, 5-6 and 8-9, characterized in that The valve core body (11) includes a small-diameter part (112) and a large-diameter part (113), the small-diameter part (112) is away from the sealing element (12) relative to the large-diameter part (113), and the outer diameter of the small-diameter part (112) is smaller than the outer diameter of the large-diameter part (113).

11. A valve device according to claim 4, wherein The valve core body (11) includes a small-diameter part (112) and a large-diameter part (113), the small-diameter part (112) is away from the sealing element (12) relative to the large-diameter part (113), and the outer diameter of the small-diameter part (112) is smaller than the outer diameter of the large-diameter part (113).

12. A valve device according to claim 7, wherein The valve core body (11) includes a small-diameter part (112) and a large-diameter part (113), the small-diameter part (112) is away from the sealing element (12) relative to the large-diameter part (113), and the outer diameter of the small-diameter part (112) is smaller than the outer diameter of the large-diameter part (113).

13. A valve device according to claim 4, wherein The first valve core assembly (1) has a plurality of balance channels (13), and the balance channels (13) are uniformly distributed along the circumference of the mounting part (111).

14. A valve device according to any of claims 5-6, 8-9, characterized in that The first valve core assembly (1) has a plurality of balance channels (13), and the balance channels (13) are uniformly distributed along the circumference of the mounting part (111).

15. The valve apparatus of claim 7, wherein The first valve core assembly (1) has a plurality of balance channels (13), and the balance channels (13) are uniformly distributed along the circumference of the mounting part (111).

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