Sealing structure of valve body and valve seat and gate valve

Abstract

This invention relates to a gate valve, and more particularly to a sealing structure for the valve body and seat, and the gate valve itself. The valve body has an annular region for mounting the valve seat. This annular region includes a first annular groove into which the valve seat is partially inserted, and a second annular groove coaxial with and connected to the first annular groove. A seal is formed between the valve seat and the wall of the first annular groove. The inner diameter of the second annular groove is larger than the inner diameter of the first annular groove, and the wall of the second annular groove is spaced apart from the valve seat, forming an annular space. The sealing structure includes an annular carbon seal and an annular pressing member fitted onto the valve seat, and further includes a force-applying component disposed within the annular space. The force-applying component pushes and locks the annular pressing member towards the bottom of the second annular groove. Compared with the prior art, this invention ensures a seamless seal between the valve seat and the valve body. Furthermore, the high-temperature resistance and corrosion resistance of the annular carbon seal allow the entire gate valve to meet the requirements of chemical production applications.

Description

Technical Field

[0001] The embodiments of the present invention relate to a gate valve, and more particularly to a sealing structure between a valve body and a valve seat, and a gate valve with the sealing structure. Background Art

[0002] In petrochemical, coal chemical, polysilicon, power plant ash removal, mud, boiler slag removal and other material systems, gate valves are often used as switch elements to cut off the pipelines of the material system. Since the conveying temperature of these media in the material system is generally high (generally greater than or equal to 500°C), the sealing performance of the gate valve is particularly important, that is, the sealing between the valve seat and the valve body. Conventional gate valves generally use O-rings to achieve the seal between the valve seat and the valve. Since these sealing rings are generally made of rubber, and the fragrant rubber material is difficult to withstand high temperature and corrosion resistance, it is difficult to meet the sealing requirements of chemical production. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to design a sealing structure between a valve body and a valve seat and a gate valve, which can improve the sealing and corrosion resistance between the valve seat and the valve body to meet the use requirements of the gate valve in chemical production.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a sealing structure between a valve body and a valve seat, wherein an annular area for mounting the valve seat is provided in the valve body, the annular area comprising: a first annular groove into which the valve seat is partially inserted, a second annular groove coaxial with and connected to the first annular groove, a seal is formed between the valve seat and the groove wall of the first annular groove, the inner diameter of the second annular groove is larger than the inner diameter of the first annular groove, the groove wall of the second annular groove is spaced from the valve seat to form an annular space, and the sealing structure comprises:

[0005] An annular carbon seal is sleeved on the valve seat and embedded in the annular space; the outer ring of the annular carbon seal abuts against the groove wall of the second annular groove to form a seal, and the inner ring of the annular carbon seal abuts against the valve seat to form a seal;

[0006] An annular pressing member is sleeved on the valve seat and embedded in the annular space to abut against the annular carbon sealing member;

[0007] The force-applying component is arranged in the annular space and is used for pushing and locking the annular pressing member toward the groove bottom of the second annular groove.

[0008] In addition, an embodiment of the present invention further provides a gate valve, comprising: a valve body, two valve seats arranged in the valve body, and a valve plate arranged in the valve body, wherein one of the valve seats is connected to the water inlet side of the valve body, and the other valve seat is connected to the water outlet side of the valve body, the two valve seats are separated from each other to form a cut-off area into which the valve plate can be inserted or withdrawn, and a sealing structure of the valve body and the valve seat as described above is provided between any one of the valve seats and the valve body.

[0009] Compared with the prior art, the embodiment of the present invention has the advantages that the annular area provided on the valve seat is composed of the first annular groove and the second annular groove, and the first annular groove can be inserted into the valve seat, and the inner diameter of the second annular groove is larger than the inner diameter of the first annular groove, so that the groove wall of the first annular groove can be separated from the valve seat to form an annular space, and the entire sealing structure includes an annular carbon seal and an annular pressure piece sleeved on the valve seat, and the annular carbon seal and the annular pressure piece are directly embedded in the annular space, and the outer ring and the inner ring of the annular carbon seal are respectively connected to the groove of the second annular groove. The wall and the valve seat abut against each other to form a seal, and the annular pressing piece directly abuts against the annular carbon seal. At the same time, the sealing structure also includes a force-adding component arranged in the annular space. In actual application, the force-adding component is used to push and lock the annular pressing piece toward the bottom of the second annular groove, so that the annular pressing piece can firmly press the annular carbon seal against the bottom of the second annular groove to ensure that a seamless seal can be achieved between the valve seat and the valve body. At the same time, with the help of the high temperature resistance and corrosion resistance of the annular carbon seal, the entire gate valve can meet the use requirements in chemical production.

[0010] Further, the force-applying assembly includes: a plurality of screws, an annular support seat disposed in the second annular groove;

[0011] The annular support seat is provided with a plurality of threaded holes around its own axis direction, and the number of the threaded holes is the same as the number of the screws and they are uniquely corresponding; each of the screws is threadedly connected to the annular support seat through the uniquely corresponding threaded hole, and each of the screws is used to penetrate the uniquely corresponding threaded hole and abut against the annular pressing member;

[0012] When any of the screws is used to rotate in the unique corresponding threaded hole, it performs linear motion along the axial direction of the threaded hole.

[0013] Furthermore, the threaded holes are equidistantly arranged on the annular support seat.

[0014] Further, the annular support seat comprises: an outer edge surface, and an inner edge surface opposite to the outer edge surface;

[0015] A portion of the outer edge surface protrudes in a direction away from the inner edge surface to form an annular protrusion, the outer edge surface is separated from the groove wall of the second annular groove, and the inner edge surface is tightly fitted to the valve seat;

[0016] The sealing structure further includes: a positioning component disposed on the groove wall of the second annular groove, wherein the positioning component is engaged with the annular protrusion along the axial direction of the second annular groove.

[0017] Further, the positioning component is a positioning ring coaxially arranged with the second ring groove;

[0018] Alternatively, the positioning component includes: a plurality of positioning blocks arranged around the axial direction of the second annular groove.

[0019] Furthermore, the positioning component includes: a plurality of positioning blocks arranged around the axial direction of the second annular groove;

[0020] The groove wall of the second ring groove is also provided with an installation groove in which each positioning block is embedded. Each positioning block is partially exposed outside the installation groove and is locked with the annular protrusion of the positioning ring.

[0021] Furthermore, a seal is formed between the outer ring of the annular pressing member and the valve body, and a seal is formed between the inner ring of the annular pressing member and the valve seat.

[0022] Furthermore, the bottom of the second annular groove is an annular inclined surface;

[0023] The vertical distance from the inner circle of the annular bevel to the bottom of the first annular groove is smaller than the vertical distance from the outer circle of the annular bevel to the bottom of the first annular groove, and the annular carbon seal abuts against one side of the annular bevel and fits with the annular bevel.

[0024] Furthermore, the annular carbon seal is a flexible graphite seal ring, and the flexible graphite seal ring is used to deform along an axial direction perpendicular to the second annular groove under the thrust of the force-applying component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0026] Figure 1 This is a schematic diagram of the internal structure of the valve body in the first embodiment of the present invention;

[0027] Figure 2This is a schematic diagram of the assembly of the valve body and the valve seat in the first embodiment of the present invention;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A part;

[0029] Figure 4 This is a schematic diagram of the distribution of the positioning blocks on the valve body in the first embodiment of the present invention;

[0030] Figure 5 This is a schematic structural diagram of the annular area on the valve body in the first embodiment of the present invention;

[0031] Figure 6 This is a schematic structural diagram of an annular support seat in the first embodiment of the present invention;

[0032] Figure 7 It is a schematic structural diagram of a gate valve according to a second embodiment of the present invention;

[0033] Figure 8 for Figure 7 A partial enlarged view of part B in the middle. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can be implemented.

[0035] The first embodiment of the present invention relates to a sealing structure between a valve body and a valve seat, such as Figure 1 and Figure 5 As shown, in this embodiment, an annular area 11 for mounting the valve seat 2 is provided in the valve body 1, and the annular area 11 includes: a first annular groove 111 partially inserted into the valve seat 2, and a second annular groove 112 coaxial with and connected to the first annular groove 111. Figure 1 As shown, a seal is formed between the valve seat 1 and the groove wall of the first annular groove 111. Specifically, Figure 2 and Figure 3 As shown, an annular receiving groove (not shown in the figure) can be opened on the groove wall of the first annular groove 111 around its own axial direction, and a sealing ring 3 is provided in the annular receiving groove, and the sealing ring 3 also abuts against the valve seat 2, so that a sealing surface can be formed between the valve seat 2 and the groove wall 1111 of the first annular groove 111 with the help of the sealing ring 3.

[0036] In addition, in this embodiment, if Figure 3 and Figure 5As shown, the inner diameter of the second annular groove 112 is larger than the inner diameter of the first annular groove 111, so that the groove wall 1121 of the second annular groove 112 and the valve seat 2 can be separated from each other to form an annular space (not shown in the figure). The corresponding sealing structure of this embodiment, such as Figure 2 and Figure 3 As shown, it includes: an annular carbon seal 4 and an annular pressure piece 5 which are sleeved on the valve seat 2, wherein the annular carbon seal 4 and the annular pressure piece 5 are both embedded in the annular space, and the annular carbon seal 4 and the annular pressure piece 5 are arranged in a direction from the water inlet side 12 to the water outlet side 13 of the valve body 1, and abut against each other, and at the same time, the outer ring of the annular carbon seal 4 abuts against the groove wall 1121 of the second annular groove 112 to form a seal, and the inner ring of the annular carbon seal 4 abuts against the valve seat 2 to form a seal.

[0037] In addition, if Figure 2 and Figure 3 As shown, the sealing structure of this embodiment further includes: a force component 6 disposed in the annular space, and the force component 6 is used to push and lock the annular pressing member 5 toward the bottom of the second annular groove 112 .

[0038] It is not difficult to see from the above content that in actual application, since the force-applying component 6 can be used to push and lock the annular pressing member 5 toward the bottom of the second annular groove 112, the annular pressing member 5 can firmly press the annular carbon seal 4 against the bottom of the second annular groove 112 to ensure seamless sealing between the valve seat 2 and the valve body 1. At the same time, with the help of the high temperature resistance and corrosion resistance of the annular carbon seal 4, the entire gate valve can meet the use requirements in chemical production.

[0039] Specifically, in this embodiment, if Figure 3 As shown, the force-adding assembly 6 includes: a plurality of screws 61, and an annular support seat 62 disposed in the second annular groove 112. Figure 6 As shown, the annular support seat 62 is provided with a plurality of threaded holes 621 around its own axis, and the number of the threaded holes 621 is the same as the number of the screws 61 and they are uniquely corresponding. Figure 3As shown, each screw 61 can be threadedly connected to the annular support seat 62 through each unique corresponding threaded hole 621, and each screw 61 is used to penetrate the unique corresponding threaded hole 621 and abut against the annular pressing member 5. At the same time, any screw 61 can be rotated in the threaded hole 621 with the help of the unique corresponding threaded hole 621, and when any screw 61 is rotating, it can move linearly along the axial direction of the threaded hole 621, so as to achieve the pushing of the annular pressing member 5. At the same time, under the rotation of each screw 61, the force applied by the annular pressing member 5 to the annular carbon seal 4 can also be adjusted, so that the annular carbon seal 4 has better sealing performance with the valve body 1 and the valve seat 2. And, as a preferred solution, each threaded hole 621 is equidistantly arranged on the annular support seat 62, so that when each screw 61 pushes the annular pressing member 5, the force applied by the annular pressing member 5 to the annular carbon seal 4 can be evenly distributed, avoiding the phenomenon of excessive local force.

[0040] It should be noted that, in this embodiment, the annular carbon seal 4 can be made of a flexible graphite seal ring, so that the seal ring can be deformed to a certain extent in the direction perpendicular to the axis of the second annular groove 112 after being subjected to the force of the annular pressing member 5, so that the valve seat 2 and the valve body 1 can be more closely fitted to the annular carbon seal 4, further improving the sealing performance between the valve seat 2 and the valve body 1. And, as a preferred solution, by Figure 3 and Figure 5 It is not difficult to see that the groove bottom 1122 of the second annular groove 112 disclosed in the present embodiment is an annular slope, and the vertical distance from the inner circle of the annular slope to the groove bottom of the first annular groove 111 is smaller than the vertical distance from the outer circle of the annular slope to the groove bottom of the first annular groove 111, and the corresponding annular carbon seal 4 presses against one side of the annular slope and fits with the annular slope, so that the annular carbon seal 4 can automatically move and squeeze toward the direction of the valve seat 2 with the help of the annular slope of the second annular groove 112 after being subjected to the force of the annular pressing member 5, thereby further improving the tightness of the fit between the annular carbon seal 4 and the valve seat 2, and then improving the sealing performance between the valve seat 2 and the valve body 1.

[0041] In addition, it is worth mentioning that in order to enable the annular support seat 62 to be fixed in the second annular groove 112, in this embodiment, Figure 3As shown, the annular support seat 62 includes: an outer edge surface 622, an inner edge surface 623 opposite to the outer edge surface 622, and the outer edge surface 622 of the annular support seat 62 has an annular protrusion 624 that partially protrudes in the direction away from the inner edge surface of the annular support seat 62, and at the same time, the outer edge surface 622 of the annular support seat 62 is separated from the groove wall 1121 of the second annular groove 112, and the inner edge surface 623 of the annular support seat 62 is tightly fitted with the valve seat 2. In addition, the sealing structure of this embodiment also includes: a positioning component 7 arranged on the groove wall 1121 of the second annular groove 112, and the positioning components 7 are all locked with the annular protrusion 624 along the axial direction of the second annular groove 112. Through the locking of each positioning component 7 with the annular protrusion 624, the annular support seat 62 can be retained in the second annular groove 112, and the annular support seat 62 is prevented from withdrawing from the second annular groove 112 due to the reverse force of each screw 61.

[0042] At the same time, in order to facilitate the assembly and fixation of the positioning component 7 and the annular support seat 62 in the second annular groove 112, Figure 4 It is not difficult to see that in this embodiment, the positioning component 7 is composed of a plurality of positioning blocks 71 arranged around the axial direction of the second annular groove 112. Figure 5 As shown, the groove wall 1121 of the second annular groove 112 is also provided with a mounting groove 1123 in which each positioning block can be embedded, and each positioning block is placed in the mounting groove 1123. For example, in this embodiment, there are two positioning blocks 71, and each positioning block 71 can be a semicircular structure, and the corresponding mounting groove 1123 is an annular structure. During installation, the two semicircular positioning blocks 71 can be spliced ​​together in the mounting groove 1123 to form an annular positioning component 7, and each positioning block 71 has a part exposed outside the mounting groove 1123 to achieve buckling with the annular protrusion 624 of the annular support seat 62. Through this assembly type, the assembly of the positioning component 7 and the annular support seat 62 in the second annular groove 112 can be completed without using any locking components, making the entire assembly process very simple.

[0043] It should be noted that, in actual application, the number of mounting grooves can also be matched according to the number of positioning blocks 71. For example, the number of positioning blocks 71 and the number of mounting grooves can be set to the same number, and each mounting groove is also arranged around the axis direction of the second annular groove 112, and is uniquely arranged corresponding to each positioning block 71. During operation, each positioning block 71 can be embedded in each uniquely corresponding mounting groove 1123. In this way, each positioning block 71 can also be buckled against the annular protrusion 624 of the annular support seat 62. Of course, as an alternative, the positioning component 7 in this embodiment can also be a fixed ring, that is, the positioning component 7 is an annular component arranged around the axis direction of the second annular groove 112, and this annular component 7 can also be buckled against the annular protrusion 624 of the annular support seat 62.

[0044] In addition, as a preferred solution, in order to further improve the sealing performance between the valve seat 2 and the valve body 1, in this embodiment, as Figure 3 As shown, the annular pressing member 5 forms a seal with the valve seat 2 and the groove wall 1121 of the second annular groove 112 respectively. Specifically, grooves can be respectively opened on the annular pressing member 5 and the valve seat 1, and a sealing component 20 is arranged in the groove. The sealing component 20 can form a sealing surface between the annular pressing member 5 and the groove wall 1121 of the valve seat 2 and the second annular groove 112 respectively, thereby further improving the sealing performance between the valve seat 2 and the valve body 1.

[0045] A second embodiment of the present invention relates to a gate valve, such as Figure 7 As shown, the gate valve comprises: a valve body 1, two valve seats 2 arranged in the valve body 1, and a valve plate 8 arranged in the valve body 1. The valve body 1 comprises a water inlet side 12, a water outlet side 13 opposite to the water inlet side 12, and a flow channel 14 connecting the water inlet side 12 and the water outlet side 13. At the same time, one of the two valve seats 2 is opposite to and connected to the water inlet side 12 of the valve body 1, while the other valve seat 2 is opposite to and connected to the water outlet side 13 of the valve body 1, and the two valve seats 2 are spaced apart from each other to form a cut-off area (not shown in the figure) into which the valve plate 8 can be inserted or withdrawn.

[0046] In addition, in this embodiment, if Figure 8 As shown, a sealing structure as described in the first embodiment is provided between any valve seat 2 and the valve body 1. It is not difficult to see that, since the sealing structure in the first embodiment is adopted between the two valve seats and the valve body, a seamless seal can be achieved between the valve seat 2 and the valve body 1. At the same time, with the help of the high temperature resistance and corrosion resistance of the annular carbon seal 4 in the sealing structure, the entire gate valve can meet the use requirements in chemical production.

[0047] In addition, it is worth mentioning that Figure 8As shown, the gate valve of this embodiment also includes: a plurality of resilient components 10 arranged at the bottom of each first annular groove 111, and each resilient component 10 in each first annular groove 111 is arranged around the axial direction of the first annular groove 111, and each resilient component 10 in each first annular groove 111 applies a resilient force to the valve seat 2 along the axial direction of the first annular groove 111, so that after the valve plate 8 cuts off the flow channel 14 of the valve body 1, that is, after the valve plate 8 is inserted into the cut-off area formed between the two valve seats 2, the valve seat 2 can rely on the resilient force of each resilient component 10 to fit tightly on the valve plate 8, thereby ensuring the sealing performance between the valve plate 8 and the valve seat 2 after cutting off the flow channel 14, and avoiding leakage.

[0048] In addition, in the present embodiment, since the annular support seat 62 and the positioning blocks 71 of the positioning component 7 are interlocked with each other, when the valve seat 2 moves toward the valve plate 8 with the aid of the rebound components 10, the annular support seat 62 can, with the aid of the interlocking relationship of the positioning blocks 71, prevent itself from withdrawing from the second annular groove 112 due to the force of the valve seat 2, so that the annular carbon seal 4 can still fit tightly against the bottom of the second annular groove 112, and form a seal with the groove wall 1121 of the second annular groove 112 and the valve seat 2, respectively, thereby effectively ensuring the sealing performance between the valve body 1 and the valve seat 2.

[0049] It should be noted that, in this embodiment, Figure 8 As shown, each rebound component 10 adopts a spring. At the same time, in order to avoid bending of each spring during the rebound process, a groove 21 in which the spring 10 can be partially embedded is opened on one side of the bottom of the first annular groove 111 of the valve seat 2. By partially accommodating the spring 10 by the groove 21, the rebound force applied by each spring 10 to the valve seat 2 can be concentrated on the bottom of each groove 111, thereby avoiding deflection of the valve seat 2 due to uneven rebound force applied by each spring 10.

[0050] Those skilled in the art will appreciate that the above-mentioned embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A sealing structure between a valve body and a valve seat, wherein an annular area for mounting the valve seat is provided in the valve body, characterized in that: The annular area includes: a first annular groove into which the valve seat is partially inserted, a second annular groove coaxial with and connected to the first annular groove, a seal is formed between the valve seat and the groove wall of the first annular groove, the inner diameter of the second annular groove is larger than the inner diameter of the first annular groove, the groove wall of the second annular groove and the valve seat are separated from each other to form an annular space, and the sealing structure includes: An annular carbon seal is sleeved on the valve seat and embedded in the annular space; the outer ring of the annular carbon seal abuts against the groove wall of the second annular groove to form a seal, and the inner ring of the annular carbon seal abuts against the valve seat to form a seal; An annular pressing member is sleeved on the valve seat and embedded in the annular space to abut against the annular carbon sealing member; A force-applying component is disposed in the annular space and is used to push and lock the annular pressing member toward the bottom of the second annular groove; The force-applying assembly includes: a plurality of screws and an annular support seat disposed in the second annular groove; The annular support seat is provided with a plurality of threaded holes around its own axis direction, and the number of the threaded holes is the same as the number of the screws and they are uniquely corresponding; each of the screws is threadedly connected to the annular support seat through the uniquely corresponding threaded hole, and each of the screws is used to penetrate the uniquely corresponding threaded hole and abut against the annular pressing member; When any of the screws is used to rotate in the unique corresponding threaded hole, it performs linear motion along the axis direction of the threaded hole; The annular support seat comprises: an outer edge surface and an inner edge surface opposite to the outer edge surface; A portion of the outer edge surface protrudes in a direction away from the inner edge surface to form an annular protrusion, the outer edge surface is separated from the groove wall of the second annular groove, and the inner edge surface is tightly fitted to the valve seat; The sealing structure further comprises: a positioning component disposed on the groove wall of the second annular groove, wherein the positioning component and the annular protrusion are locked with each other along the axial direction of the second annular groove; The positioning component includes: a plurality of positioning blocks arranged around the axis direction of the second annular groove; The groove wall of the second annular groove is also provided with an installation groove in which each positioning block is embedded, and each positioning block is partially exposed outside the installation groove and is locked with the annular protrusion; The threaded holes are arranged at equal distances on the annular support seat.

2. The sealing structure of the valve body and the valve seat according to claim 1, characterized in that: A seal is formed between the outer ring of the annular pressing member and the valve body, and a seal is formed between the inner ring of the annular pressing member and the valve seat.

3. The sealing structure of the valve body and the valve seat according to claim 1, characterized in that: The bottom of the second annular groove is an annular inclined surface; The vertical distance from the inner circle of the annular bevel to the bottom of the first annular groove is smaller than the vertical distance from the outer circle of the annular bevel to the bottom of the first annular groove, and the annular carbon seal abuts against one side of the annular bevel and fits with the annular bevel.

4. The sealing structure between the valve body and the valve seat according to any one of claims 1 to 3, characterized in that: The annular carbon seal is a flexible graphite seal ring, and the flexible graphite seal ring is used to deform along an axial direction perpendicular to the second annular groove under the thrust of the force-applying component.

5. A gate valve, comprising: A valve body, two valve seats arranged in the valve body, and a valve plate arranged in the valve body, wherein one of the valve seats is communicated with the water inlet side of the valve body, and the other valve seat is communicated with the water outlet side of the valve body, and the two valve seats are separated from each other to form a cut-off area into which the valve plate can be inserted or withdrawn, characterized in that: A sealing structure between the valve body and the valve seat as described in any one of claims 1 to 4 is provided between any one of the valve seats and the valve body.

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