Valve device

Abstract

The present invention discloses a valve device, comprising a valve body having a first interface and a second interface. The valve body includes an annular cavity, an upper cavity opening formed at the upper end of the annular cavity and a first outer cavity opening formed on the outer periphery. The annular cavity communicates with the first interface through the upper cavity opening and with the second interface through the first outer cavity opening. The valve body also includes a valve seat provided with a central hole. The valve also includes a valve shaft, a dynamic friction plate, and a stop block. The dynamic friction plate is fixed to the upper end of the valve shaft and provided with an opening, and the lower end surface of the dynamic friction plate is in close contact with the upper end surface of the valve seat. At least a portion of the valve shaft is rotatably embedded in the central hole. The valve device is configured such that when the valve shaft rotates to one position, the opening and the upper cavity opening communicate with each other, and when it rotates to another position, the upper cavity opening is sealed. The stop block is detachably fixed to the lower end of the valve shaft, and the upper end surface of the stop block contacts the lower end surface of the valve seat. The valve has a good sealing effect.

Description

Technical Field

[0001] The present invention relates to the field of fluid control, and in particular to a valve device. Background Art

[0002] Please refer to Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a typical sealing structure of a valve device in the background art; Figure 1 As shown, a sealing plate 03 is positioned above the valve's internal opening 02. This sealing plate 03 is capable of moving up and down and rotating. A flow port is provided on sealing plate 03. When this port is positioned above the channel on the right side of the diagram, the lower end surface of sealing plate 03 contacts the upper plane 04 of valve body 01 under the action of fluid pressure, closing internal opening 02. Summary of the Invention

[0003] The object of the present invention is to provide a valve device having relatively good sealing performance.

[0004] The valve device includes a valve body having a first interface and a second interface. The valve body includes an annular cavity having an upper cavity opening formed at the upper end of the annular cavity and a first outer cavity opening formed on the outer periphery. The annular cavity is in communication with the first interface through the upper cavity opening and with the second interface through the first outer cavity opening. The valve body also includes a valve seat having a central hole.

[0005] The valve device also includes a valve shaft, a dynamic friction plate and a limit block; the dynamic friction plate is fixed to the upper end of the valve shaft and is provided with an opening, and the lower end surface of the dynamic friction plate is in close contact with the upper end surface of the valve seat; at least part of the valve shaft is rotatably embedded in the center hole; and is configured as follows: when the valve shaft rotates to one position, the opening and the upper cavity port are communicated with each other, and when rotated to another position, the upper cavity port is sealed; the limit block is detachably fixed to the lower end of the valve shaft and the upper end surface of the limit block contacts the lower end surface of the valve seat.

[0006] When configured as above, the dynamic friction plate cannot move axially along the center hole, so that the lower end surface of the dynamic friction plate is always in close contact with the upper end surface of the valve seat, avoiding the problem of impurities in the fluid adhering to the two due to separation of the two, resulting in the two being unable to be in close contact and the two being worn by impurities, thereby having a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a simplified diagram of the sealing structure of a typical valve device in the background technology.

[0008] Figure 1 The reference numerals in the figures are described as follows:

[0009] 01 valve body, 02 internal opening, 03 sealing disc, 04 upper surface.

[0010] Figure 2 A cross-sectional view of the overall structure of a specific embodiment of the valve device provided by the present invention;

[0011] Figure 3 It is a structural schematic diagram of the valve body in a specific embodiment;

[0012] Figure 4 Schematic diagram of the structure of the valve shaft and the dynamic friction plate in a specific embodiment;

[0013] Figure 5 It is a structural diagram of a limit block in a specific embodiment;

[0014] Figure 6 Schematic diagram of the structure of the static friction plate in the first specific embodiment;

[0015] Figure 7 Schematic diagram of the structure of the sealing member in a specific embodiment.

[0016] Figures 2 to 7 The reference numerals in the figures are described as follows:

[0017] 10 valve body, 101 first interface, 102 second interface, 103 third interface, 104 valve seat, 1041 core, 1042 peripheral portion, 1043 baffle, 105 center hole, 106 first upper cavity opening, 107 second upper cavity opening, 108 first outer cavity opening, 109 second outer cavity opening;

[0018] a receiving slot, a1 lower part, a2 upper part;

[0019] 20 valve shaft, 201 upper groove, 202 lower groove, 203 ring groove;

[0020] 30 dynamic friction plate, 301 opening;

[0021] 40 limit block, 401 upper block, 402 lower block;

[0022] 50 static friction plate, 501 inner hole, 502 first flow port, 503 second flow port;

[0023] 60 sealing member, 601 outer ring portion, 602 inner ring portion, 603 strip portion;

[0024] 70 elastomers;

[0025] 80 connector;

[0026] 90 drives. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] Please refer to Figures 2 to 4 , Figure 2 A cross-sectional view of the overall structure of a specific embodiment of the valve device provided by the present invention; Figure 3 It is a structural schematic diagram of the valve body in a specific embodiment; Figure 4 Schematic diagram of the structure of the valve shaft and the dynamic friction plate in a specific embodiment; Figure 5 It is a structural diagram of a limit block in a specific embodiment; Figure 6 Schematic diagram of the structure of the static friction plate in the first specific embodiment; Figure 7 Schematic diagram of the structure of the sealing member in a specific embodiment.

[0029] First of all, it should be noted that the above and below mentioned in the context are based on Figure 2 From this perspective, the purpose is to clearly express the technical solution, and it should not be understood as a limitation of the technical solution.

[0030] like Figure 2 and Figure 3 As shown, the valve device includes a valve body 10. The valve body 10 has a first interface 101, a second interface 102, and a third interface 103. Specifically, the first interface 101 is located above the valve body 10, and the second interface 102 and the third interface 103 are located on the left and right sides of the valve body 10. In a specific embodiment, the first interface 101 of the valve body 10 is connected to the connector 80, and a sealing ring can be installed at the connection between the valve body 10 and the connector 80 to prevent fluid from leaking outward from the connection. Of course, the sealing method of the connection between the valve body 10 and the connector is not limited to this. For example, ultrasonic welding sealing or other methods can also be used.

[0031] The valve body 10 includes a valve seat 104 , which is provided with a central hole 105 . In this embodiment, the valve seat 104 includes a core portion 1041 , a peripheral portion 1042 surrounding the core portion 1041 , and a blocking portion 1043 . The central hole 105 is provided in the core portion 1041 .

[0032] The valve body 10 also includes an annular cavity. In this embodiment, the annular cavity is generally formed directly between the peripheral portion 1042 and the core portion 1041. However, an indirect formation method is also possible, such as by making the surrounding core portion a separate component and then securing it to the valve seat. In this way, the annular cavity is formed between the surrounding core portion and the valve seat. The upper end of the annular cavity forms an upper cavity opening, and the outer periphery of the annular cavity forms a first outer cavity opening 108 and a second outer cavity opening 109.

[0033] In this embodiment, a barrier 1043 is located within the annular cavity, dividing the annular cavity into a first cavity and a second cavity, and dividing the upper cavity opening into a first upper cavity opening 106 and a second upper cavity opening 107. The first cavity can communicate with the first interface 101 through the first upper cavity opening 106 and with the second interface 102 through the first external cavity opening 108. The second cavity can communicate with the first interface 101 through the second upper cavity opening 107 and with the third interface 103 through the second external cavity opening 109.

[0034] like Figure 2 and Figure 4 As shown, the valve device further includes a valve shaft 20 , a dynamic friction plate 30 and a limit block 40 .

[0035] At least a portion of the valve shaft 20 is embedded in the center hole 105 of the valve seat 104 and is rotatable within the center hole 105. In this embodiment, two annular grooves 203 are provided on the outer circumference of the valve shaft 20, each of which houses a sealing ring. In practical applications, a different number of annular grooves 203 can be configured as needed to accommodate a different number of sealing rings. This ensures a seal between the valve shaft 20 and the valve seat 104 via the sealing rings.

[0036] The stopper 40 is detachably fixed to the lower end of the valve shaft 20, and the upper end surface of the stopper 40 contacts the lower end surface of the valve seat 104 to limit the upward movement of the valve shaft 20 and the dynamic friction plate 30. Preferably, a gasket is provided between the upper end surface of the stopper 40 and the lower end surface of the valve seat 104 to prevent the stopper 40 from directly rubbing against the valve body 10.

[0037] The dynamic friction plate 30 is fixed to the upper end of the valve shaft 20. Specifically, the dynamic friction plate 30 can be integral with the valve shaft 20 or separate and fixedly connected. Furthermore, the dynamic friction plate 30 is provided with an opening 301. Furthermore, the lower end surface of the dynamic friction plate 30 is in close contact with the upper end surface of the valve seat 104, thereby sealing the first upper cavity opening 106 or the second upper cavity opening 107 and limiting the downward movement of the valve shaft 20 and the dynamic friction plate 30.

[0038] When in use, the flow path can be switched by rotating the valve shaft 20:

[0039] When the valve shaft 20 is rotated, the dynamic friction plate 30 will rotate along with it. When the dynamic friction plate 30 rotates to the first position ( Figure 2 When the dynamic friction plate 30 is rotated to the second position, the opening 301 is communicated with the second upper cavity port 107. At this time, the first upper cavity port 106 is sealed due to the close contact between the lower end surface of the dynamic friction plate 30 and the upper end surface of the valve seat 104. When the dynamic friction plate 30 is rotated to the second position, the opening 301 is communicated with the second upper cavity port 107. At this time, the first upper cavity port 106 is sealed due to the close contact between the lower end surface of the dynamic friction plate 30 and the upper end surface of the valve seat 104.

[0040] As described above, by limiting the axial movement (upward or downward in the figure) of the dynamic friction plate 30, the lower end surface of the dynamic friction plate 30 is always in close contact with the upper end surface of the valve seat 104, avoiding the problem of impurities in the fluid adhering to the two due to separation of the two, resulting in the two being unable to be in close contact and the two being worn by impurities, thereby achieving a better sealing effect.

[0041] Further, such as Figure 2 As shown, a static friction plate 50 is disposed between the upper end surface of the valve seat 104 and the lower end surface of the dynamic friction plate 30. Furthermore, the lower end surface of the dynamic friction plate 30 is in close contact with the upper end surface of the static friction plate 50, and the lower end surface of the static friction plate 50 is in close contact with the upper end surface of the valve seat 104, so that the lower end surface of the dynamic friction plate 30 and the upper end surface of the valve seat 104 are indirectly in close contact through the static friction plate 50. Specifically, the static friction plate 50 can be integrally provided with the valve seat 104 (may be injection molded as a whole) or separately provided.

[0042] And, as Figure 6 As shown, the static friction plate 50 is provided with an inner hole 501, a first flow opening 502, and a second flow opening 503. The inner hole 501 is aligned with the center hole 105 of the valve seat 104, the first flow opening 502 is aligned with the first upper cavity opening 106, and the second flow opening 503 is aligned with the second upper cavity opening 107. When the dynamic friction plate 30 rotates to the first position, the opening 301 communicates with the first flow opening 502, and the second flow opening 503 is sealed. When the dynamic friction plate 30 rotates to the second position, the opening 301 communicates with the second flow opening 503, and the first flow opening 502 is sealed.

[0043] It should be understood that the so-called friction plate is made of a relatively wear-resistant material. Preferably, the dynamic friction plate 30 and the static friction plate 50 are both ceramic plates, which are not only wear-resistant but also high-temperature resistant, enabling the valve to transport high-temperature fluids.

[0044] As described above, by providing a static friction plate 50, the problem of direct and close contact between the dynamic friction plate 30 and the valve body 10 with average wear resistance, which causes severe wear of the valve body 10 after a long period of use and affects the sealing performance, is avoided, so that the valve device can still maintain a good sealing effect after a long period of use.

[0045] In a specific embodiment, the static friction plate 50 and the valve body 10 are separated, and a sealing member 60 is pressed between the lower end surface of the static friction plate 50 and the upper end surface of the valve seat 104. Figure 7As shown, the seal 60 includes an outer ring portion 601, an inner ring portion 602 and a strip portion 603, wherein the outer ring portion 601 is located above the upper end surface of the peripheral portion 1042 of the valve seat 104, the inner ring portion 602 is located above the upper end surface of the core portion 1041 of the valve seat 104, and the strip portion 603 is located above the upper end surface of the blocking portion 1043 of the valve seat 104.

[0046] The seal 60, on the one hand, plays a sealing role, and on the other hand, when under pressure, it will apply an upward force to the static friction plate 50, so that the upper end surface of the static friction plate 50 contacts the lower end surface of the dynamic friction plate 30 more closely, thereby improving the sealing effect.

[0047] More specifically, Figure 2 、 Figure 3 and Figure 6 As shown, a receiving groove a for receiving the seal 60 is provided between the lower end surface of the static friction plate 50 and the upper end surface of the valve seat 104. The upper portion a2 of the receiving groove a is formed on the static friction plate 50, and the lower portion a1 is formed on the valve seat 104. This arrangement can avoid the risk of misalignment of the seal 60 to ensure the sealing effect.

[0048] Further, such as Figure 2 As shown, an elastic body 70 is pressed between the upper end surface of the limit block 40 and the lower end surface of the valve seat 104. Specifically, the elastic body 70 can be a rubber ring or a spring.

[0049] The elastic body 70 , when under pressure, applies a downward force to the static friction plate 50 , causing the lower end surface of the dynamic friction plate 30 to more closely contact the upper end surface of the static friction plate 50 , thereby improving the sealing effect.

[0050] In a specific embodiment, the limit block 40 is detachably fixed to the lower end of the valve shaft 20 and realizes the axial limit function by the following method:

[0051] like Figure 5 As shown, the limit block 40 is provided with an upper block 401 and a lower block 402. Figure 4 As shown, the lower end of the valve shaft 20 is provided with an upper groove 201 and a lower groove 202, and the upper groove 201 and the lower groove 202 both pass through the valve shaft 20 along the same radial direction. The upper block 401 and the lower block 402 are respectively embedded in the upper groove 201 and the lower groove 202 along the radial direction. In the embedded state, the upper end surface of the upper block 401 abuts against the upper groove 201 wall of the upper groove 201, and the lower end surface of the upper block 401 abuts against the lower groove 202 wall of the upper groove 201, thereby making the limit block 40 detachably fixed to the lower end of the valve shaft 20.

[0052] And, as Figure 5As shown, the maximum radial dimension of the upper block 401 is greater than the diameter of the center hole 105. With this arrangement, after the upper block 401 is embedded in the upper groove 201, the edge portion of the upper block 401 extends out of the upper groove 201, and the axial limiting function is achieved by making the upper end surface of the edge portion directly or indirectly contact the lower end surface of the valve seat 104.

[0053] Of course, the stop block 40 can also be detachably fixed to the lower end of the valve shaft 20 in other ways to achieve the axial limiting function. For example, the two can be connected by a stop pin, and the circumferential surface of the stop pin is made to contact the lower end surface of the valve seat 104. However, in comparison, the above-mentioned form does not require the provision of an additional fixing member (stop pin), the overall structure is simpler, and both fixing and limiting are more reliable.

[0054] Preferably, both the upper block 401 and the lower block 402 are non-circular, and both the upper groove 201 and the lower groove 202 are non-circular. The lower end of the lower block 402 extends outside the lower groove 202 and is connected to the actuator of the valve device. With this arrangement, the actuator drives the upper block 401 and the lower block 402 to rotate, the non-circular surface of the upper block 401 abuts against the non-circular groove wall of the upper groove 201, and the non-circular surface of the lower block 402 abuts against the non-circular groove wall of the lower groove 202, thereby driving the valve shaft 20 and the dynamic friction disk to rotate, achieving power transmission.

[0055] It should be noted that, in actual applications, the first interface 101 of the valve device can be a fluid inlet, and the second interface 102 and the third interface 103 can be fluid outlets. Alternatively, the second interface 102 and the third interface 103 can be fluid inlets, and the first interface 101 can be a fluid outlet.

[0056] Furthermore, in addition to being configured as a valve device with switchable flow paths as described above, the valve device can also be configured as a single-inlet, single-outlet valve device with only one flow path. When configured as a single-inlet, single-outlet valve device, it is only necessary to ensure that the opening 301 of the dynamic friction plate 30 is in communication with the upper cavity port when it is rotated to one position and that the upper cavity port is sealed when it is rotated to another position. The aforementioned blocking portion 1043, the aforementioned third interface 103, and the aforementioned second external cavity port 109 are not required, and the static friction plate 50 only needs to be provided with a single flow port aligned with the upper cavity port.

[0057] The above describes in detail a valve device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A valve device, characterized in that: The valve body (10) comprises a valve body (10), wherein the valve body (10) has a first interface (101) and a second interface (102), wherein the valve body (10) comprises an annular cavity, wherein an upper cavity opening is formed at the upper end of the annular cavity, and a first outer cavity opening (108) is formed at the outer periphery of the annular cavity, wherein the annular cavity is in communication with the first interface (101) via the upper cavity opening, and is in communication with the second interface (102) via the first outer cavity opening (108); the valve body (10) further comprises a valve seat (104), wherein the valve seat (104) is provided with a central hole (105); The valve device further comprises a valve shaft (20), a dynamic friction plate (30) and a limit block (40); the dynamic friction plate (30) is fixed to the upper end of the valve shaft (20) and is provided with an opening (301), and the lower end surface of the dynamic friction plate (30) is in close contact with the upper end surface of the valve seat (104); at least a portion of the valve shaft (20) is rotatably embedded in the center hole (105); and is configured such that: when the valve shaft (20) is rotated to one position, the opening (301) is communicated with the upper cavity port, and when it is rotated to another position, the upper cavity port is sealed; the limit block (40) is detachably fixed to the lower end of the valve shaft (20) and the upper end surface of the limit block (40) contacts the lower end surface of the valve seat (104); The limiting block (40) comprises an upper block (401) and a lower block (402), wherein the maximum radial dimension of the upper block (401) is greater than the diameter of the central hole (105); The lower end of the valve shaft (20) is provided with an upper groove (201) and a lower groove (202), and the upper groove (201) and the lower groove (202) both penetrate the valve shaft (20) along the same radial direction, and the upper block (401) and the lower block (402) are correspondingly embedded in the upper groove (201) and the lower groove (202) along the radial direction, and the upper end surface of the upper block (401) contacts the upper wall of the upper groove (201), and the lower end surface of the upper block (401) contacts the lower wall of the upper groove (201); The edge portion of the upper block (401) extends out of the upper groove (201), and the upper end surface of the edge portion directly or indirectly contacts the lower end surface of the valve seat (104) to achieve an axial limiting function.

2. The valve device according to claim 1, characterized in that The valve body (10) further comprises a third interface (103), and the valve seat (104) further comprises a baffle (1043); the baffle (1043) is located in the annular cavity and divides the annular cavity into a first cavity and a second cavity, and divides the upper cavity opening into a first upper cavity opening (106) and a second upper cavity opening (107); a second outer cavity opening (109) is further formed on the outer periphery of the annular cavity; the first cavity is in communication with the second interface (102) through the first outer cavity opening (108), and can be in communication with the first interface (101) through the first upper cavity opening (106); the second cavity is in communication with the third interface (103) through the second outer cavity opening (109), and can be in communication with the first interface (101) through the second upper cavity opening (107); The valve shaft (20) is configured such that when the valve shaft (20) rotates to one position, the opening (301) is communicated with the first upper cavity opening (106), and the second upper cavity opening (107) is sealed; when the valve shaft (20) rotates to another position, the opening (301) is communicated with the second upper cavity opening (107), and the first upper cavity opening (106) is sealed.

3. The valve device according to claim 2, characterized in that A static friction plate (50) is provided between the upper end surface of the valve seat (104) and the lower end surface of the dynamic friction plate (30), and the static friction plate (50) is provided with an inner hole (501) aligned with the central hole (105), a first flow port (502) aligned with the first upper cavity port (106), and a second flow port (503) aligned with the second upper cavity port (107); The static friction plate (50) and the valve seat (104) are integrally provided; or, the static friction plate (50) and the valve seat (104) are separately provided and a sealing member (60) is pressed between the lower end surface of the static friction plate (50) and the upper end surface of the valve seat (104); and, the upper end surface of the static friction plate (50) is in close contact with the lower end surface of the dynamic friction plate (30) to seal the first flow port (502) or the second flow port (503).

4. The valve device according to claim 3, characterized in that A receiving groove (a) for receiving the sealing member (60) is provided between the lower end surface of the static friction plate (50) and the upper end surface of the valve seat (104), wherein the upper portion (a2) of the receiving groove (a) is formed on the static friction plate (50), and the lower portion (a1) is formed on the valve seat (104).

5. The valve device according to claim 3, characterized in that The dynamic friction plate (30) and the static friction plate (50) are both made of ceramic material.

6. The valve device according to any one of claims 1 to 5, characterized in that: The upper block (401) and the lower block (402) are both non-circular blocks, and the upper groove (201) and the lower groove (202) are both non-circular grooves; and the lower end of the lower block (402) extends out of the lower groove (202) and is connected to the driver (90) of the valve device.

7. The valve device according to any one of claims 1 to 5, characterized in that: An annular groove (203) is provided on the outer periphery of the valve shaft (20), and a sealing ring is installed in the annular groove (203).

8. The valve device according to any one of claims 1 to 5, characterized in that: A gasket is provided between the upper end surface of the limit block (40) and the lower end surface of the valve seat (104).

9. The valve device according to any one of claims 1 to 5, characterized in that: An elastic body (70) is pressed between the upper end surface of the limit block (40) and the lower end surface of the valve seat (104).

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