A low temperature wedge-type single-cassette gate valve

Abstract

The present application relates to the technical field of gate valves, and discloses a low-temperature wedge-type single-box gate valve, including a valve body, a support frame provided on the valve body, a valve stem slidably connected in the support frame, a sealing block provided between the valve stem and the support frame, and a cooling ring provided on the support frame, the cooling ring surrounds the circumference of the support frame, and the diameter of the cooling ring is larger than the diameter of the support frame. In the present application, the cooling ring surrounds the circumference of the support frame, and the diameter of the cooling ring is larger than the diameter of the support frame, so that the low temperature of the medium needs to be transferred on the cooling ring, increasing the transfer area of ​​heat exchange, so that the low temperature of the medium can absorb sufficient heat during the heat exchange process, greatly increasing the temperature of the sealing block after heat exchange, reducing the phenomenon of icing of the sealing block, thereby enabling the sealing block to be used normally and allowing a stable seal between the valve stem and the support frame.

Description

Technical Field

[0001] The present application relates to the technical field of gate valves, and in particular to a low-temperature wedge-type single-cassette gate valve. Background Art

[0002] A gate valve is a valve used to control the flow of fluid. Its opening and closing parts (gate) move in the direction perpendicular to the flow direction of the medium to achieve the opening and closing function. The wedge-type single-disc gate valve is a type of gate valve. The seal is achieved by the cooperation of the gate and the valve seat. Gate valves are widely used in petrochemical, refrigeration systems and other fields.

[0003] In the related art, the gate valve includes a valve body, a bracket is provided on the valve body, a valve stem is slidably connected in the bracket, and the valve stem is used to control the opening and closing of the valve body. A sealing block is usually provided between the valve stem and the bracket, and the sealing block is usually made of flexible graphite material.

[0004] In the valve industry, the operating temperature of flexible graphite is generally required to be above 0 degrees Celsius, otherwise the sealing block is prone to ice and the overall sealing of the valve will be affected; when the gate valve is transporting low-temperature media, such as liquid nitrogen and other media, the low temperature of the medium will be transmitted to the sealing block along the support frame. Due to the heat exchange of the low temperature of the medium, the sealing block is prone to ice, so that the frozen sealing block will affect the sealing of the valve, thereby preventing the normal use of the valve. Summary of the invention

[0005] In order to improve the problem that the sealing block is easy to freeze, the present application provides a low-temperature wedge-type single-box plate gate valve.

[0006] The present application provides a low-temperature wedge-type single-box gate valve, which adopts the following technical solution:

[0007] A low-temperature wedge-type single-box gate valve comprises a valve body, a support frame is provided on the valve body, a valve stem is slidably connected in the support frame, a sealing block is provided between the valve stem and the support frame, a cooling ring is provided on the support frame, the cooling ring surrounds the circumference of the support frame, and the diameter of the cooling ring is greater than the diameter of the support frame.

[0008] By adopting the above technical scheme, the cooling ring is surrounded along the circumference of the support frame, and the diameter of the cooling ring is larger than the diameter of the support frame, so that the low temperature of the medium needs to be transferred on the cooling ring, increasing the transfer area of ​​heat exchange, so that the low temperature of the medium can absorb sufficient heat during the heat exchange process, greatly increasing the temperature of the sealing block after heat exchange, reducing the phenomenon of icing of the sealing block, and thus enabling the sealing block to be used normally, so that the valve stem and the support frame can be stably sealed; at the same time, the low temperature of the medium condenses into water droplets after heat exchange, and the cooling ring supports the water droplets so that the water droplets can fall along the edge of the cooling ring. At this time, the valve body is covered with thermal insulation cotton, and the water droplets will not directly fall into the openings of the thermal insulation cotton, so that the cooling ring has the function of blocking the flow of condensed water.

[0009] Optionally, a heating wire is sleeved on the support frame, and the heating wire is located outside the sealing block, and the heating wire is used to heat the sealing block.

[0010] By adopting the above technical solution, the heating wire is arranged outside the sealing block, and the heating wire is used to heat the sealing block, so that the sealing block is not easily affected by the heat exchange of the low-temperature medium, and the icing of the sealing block is further reduced.

[0011] Optionally, a fixing ring is provided on the support frame, a ring groove is provided in the fixing ring for placing the heating wire, the ring groove penetrates to the side of the fixing ring, and a limiting component for sealing the opening of the ring groove is provided on the fixing ring.

[0012] By adopting the above technical solution, a ring groove is opened on the fixing ring, and the heating wire is located in the ring groove, so that outsiders will not directly touch the heating wire, avoiding the situation where outsiders accidentally touch the heating wire and get injured, thereby increasing the safety performance of the use of the heating wire.

[0013] Optionally, the limit assembly includes a limit ring and a limit block, the limit ring is rotatably connected to the support frame, the limit block is arranged on the limit ring, the fixed ring is provided with a limit groove for the limit block to be inserted, the fixed ring is provided with a through hole connected to the limit groove, and the through hole is for the limit block to pass through; when the limit block is inserted into the limit groove, the limit ring blocks the opening passing through the ring groove; when the limit block is located at the through hole, the limit ring can be detached from the fixed ring.

[0014] By adopting the above technical solution, the limit block passes through the perforation, and the staff rotates the limit ring to move the limit block from the perforation to the limit groove, so that the groove wall of the limit groove limits the limit block, thereby reducing the possibility of the limit block detaching from the fixed ring, so that the fixed ring and the limit ring can be fixed to each other, avoiding debris from falling into the ring groove, and reducing the risk of igniting debris when the heating wire is heated; by opening a perforation on the fixed ring, the limit block is detached from the perforation, and the separation of the fixed ring and the limit ring is achieved, so that the heating wire can detach from the ring groove, so as to facilitate the maintenance or installation of the heating wire.

[0015] Optionally, a water storage tank is provided on the cooling ring, and the water storage tank extends along the circumference of the cooling ring. An absorbent sponge for absorbing water is provided in the water storage tank.

[0016] By adopting the above technical solution, the water storage tank extends along the circumference of the cooling ring, and the water-absorbing sponge is arranged in the water storage tank. When the low temperature of the medium is heat exchanged, the cold air will condense into water droplets and fall on the cooling ring. The water-absorbing sponge can absorb the moisture to prevent excessive moisture from accumulating on the cooling ring and dripping onto the thermal insulation cotton, causing the thermal insulation cotton to become damp.

[0017] Optionally, the water absorbent sponge is provided with a plurality of water absorbent strips, and the plurality of water absorbent strips are distributed along the length direction of the water absorbent sponge.

[0018] By adopting the above technical solution, the water-absorbing strips are distributed along the length direction of the water-absorbing sponge. When the water-absorbing sponge absorbs water, when the water in the water-absorbing sponge reaches the water-absorbing strips, the water-absorbing strips can share the water in the water-absorbing sponge. At this time, due to the gravity on the water-absorbing strips, the water-absorbing strips fall away from one end of the water-absorbing sponge, and the water-absorbing strips can bend. At this time, the staff can directly observe whether the water-absorbing strips are bent to determine whether the water-absorbing sponge can continue to absorb water.

[0019] Optionally, a placement strip is provided on the water-absorbing sponge, and a placement hole for inserting the placement strip is opened on the fixing ring; when the placement strip is located in the placement hole, the water-absorbing sponge is fixed on the fixing ring.

[0020] By adopting the above technical solution, the placement bar is located in the placement hole, and the hole wall of the placement hole limits the placement bar, so that the absorbent sponge can be fixed on the fixing ring, so that the absorbent sponge is not easily tilted due to absorbing too much water, and the absorbent sponge can be more stably located in the cooling ring.

[0021] Optionally, the limit ring is slidably connected to a limit strip, the limit strip is provided with a limit slope, the limit block can drive the limit strip to move via the limit slope, and the limit strip is provided with a placement groove for inserting the placement strip; when the limit block is located in the limit groove, the placement groove is aligned with the placement hole; when the limit strip is not in the limit groove, the limit strip blocks the placement hole.

[0022] By adopting the above technical solution, the limit block is inserted into the limit groove, and the limit block drives the limit bar to move through the limit slope, so that the placement groove is aligned with the placement hole, and then the staff inserts the placement bar through the placement hole into the placement groove; if the limit block is not in the limit groove, the limit bar blocks the placement hole, and the placement bar cannot be inserted into the placement hole. At this time, the absorbent sponge can protrude and the staff can directly see it, so that the staff can know that the limit ring is not installed in place.

[0023] Optionally, a stop ring is rotatably connected to the fixing ring, a through hole is formed on the stop ring for the water-absorbing sponge to pass through, and a receiving groove is formed on the fixing ring for the water-absorbing sponge to be placed; when the limit strip is located in the placement groove, the water-absorbing sponge is located in the receiving groove.

[0024] By adopting the above technical solution, the placement bar is inserted into the placement groove so that the water-absorbing sponge can be located in the receiving groove, and then the staff rotates the stop ring so that the stop ring can block the receiving groove, making it difficult for the water-absorbing sponge to escape from the receiving groove, thereby achieving the fixation of the water-absorbing sponge on the fixing ring; if the limit block is not in the limit groove, the placement bar cannot be inserted into the placement groove, and the water-absorbing sponge cannot be completely located in the receiving groove at this time. The staff can directly discover this when rotating the stop ring, thereby avoiding the situation where the staff does not discover the state of the water-absorbing sponge and the limit ring is not installed in place.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The cooling ring is surrounded by the circumference of the support frame, and the diameter of the cooling ring is larger than that of the support frame, so that the low temperature of the medium needs to be transferred on the cooling ring, increasing the transfer area of ​​heat exchange, so that the low temperature of the medium can absorb sufficient heat during the heat exchange process, greatly increasing the temperature of the sealing block after heat exchange, reducing the phenomenon of icing of the sealing block, and thus enabling the sealing block to be used normally, so that the valve stem and the support frame can be stably sealed; at the same time, the low temperature of the medium condenses into water droplets after heat exchange, and the cooling ring supports the water droplets so that the water droplets can fall along the edge of the cooling ring. At this time, the valve body is covered with thermal insulation cotton, and the water droplets will not directly fall into the opening of the thermal insulation cotton, so that the cooling ring has the function of blocking the flow of condensed water.

[0027] 2. The water-absorbing strips are distributed along the length of the water-absorbing sponge. When the water in the water-absorbing sponge reaches the water-absorbing strips when the water-absorbing sponge absorbs water, the water-absorbing strips can share the water in the water-absorbing sponge. At this time, due to the gravity on the water-absorbing strips, the water-absorbing strips fall away from one end of the water-absorbing sponge and the water-absorbing strips can bend. At this time, the staff can directly observe whether the water-absorbing strips bend to determine whether the water-absorbing sponge can continue to absorb water. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of Example 1;

[0029] Figure 2 is a cross-sectional view highlighting the sealing block in Example 1;

[0030] Figure 3 is a schematic structural diagram of Example 2;

[0031] Figure 4 is along Figure 3 Partial cross-sectional view along line AA;

[0032] Figure 5 yes Figure 4 A magnified schematic diagram of part B;

[0033] Figure 6 It is a schematic diagram of the structure of the highlight limit strip in Example 2.

[0034] 1. Valve body; 2. Support frame; 21. Operating part; 22. Support part; 221. Accommodating groove; 222. Sealing block; 23. Mounting part; 24. Valve stem; 3. Cooling ring; 31. Water storage tank; 311. Water storage slope; 32. Water-absorbing sponge; 321. Water-absorbing strip; 332. Placement strip; 4. Fixed ring; 41. Ring groove; 42. Pop-up spring; 421. Pop-up plate; 422. Heating wire; 43. Limiting groove; 431. Perforation; 44. Sliding groove; 441. Sliding spring; 442. Limiting strip; 443. Limiting slope; 444. Placement groove; 45. Accommodating groove; 451. Placement hole; 46. Stop ring; 461. Through hole; 5. Limiting assembly; 51. Limiting ring; 52. Limiting block. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] Example 1

[0037] This embodiment discloses a low temperature wedge-type single-cassette gate valve. Figure 1 and Figure 2 A low temperature wedge type single box gate valve includes a valve body 1, a support frame 2 is bolted to the valve body 1, a valve stem 24 is slidably connected in the support frame 2, and the valve stem 24 is used to open and close the valve body 1. The support frame 2 includes an operating part 21, a supporting part 22 and a mounting part 23, the operating part 21 is integrally formed on one end of the supporting part 22, and the mounting part 23 is integrally formed on the other end of the supporting part 22.

[0038] Reference Figure 1 and Figure 2 The inner wall of the support part 22 is provided with a receiving groove 221, and a sealing block 222 is fixedly connected in the receiving groove 221. The sealing block 222 is made of flexible graphite and is used to achieve sealing between the valve stem 24 and the support frame 2. The support part 22 is overall longer to increase the distance of heat exchange.

[0039] Reference Figure 1 and Figure 2 A cooling ring 3 is welded on the outer surface of the support portion 22 , and the cooling ring 3 extends along the circumference of the support portion 22 , and the diameter of the cooling ring 3 is greater than the diameter of the support portion 22 .

[0040] The implementation principle of Example 1 is as follows: by disposing the cooling ring 3 on the support portion 22, the heat exchange area is increased, so that the temperature of the sealing block 222 after the heat exchange can be increased, and the sealing block 222 is not easy to freeze.

[0041] Example 2

[0042] Reference Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that a fixing ring 4 is rotatably connected to the support portion 22 .

[0043] Reference Figure 5 The inner wall of the fixing ring 4 is provided with an annular groove 41, which extends along the circumference of the support portion 22 and penetrates to the ground where the fixing ring 4 is away from the ground. A plurality of pop-up springs 42 are fixedly connected to the groove wall of the annular groove 41, and the plurality of pop-up springs 42 are distributed in an array along the circumference of the annular groove 41. An ejection plate 421 is provided in the annular groove 41, and the ejection plate 421 is fixedly connected to the end surface of the ejection spring 42.

[0044] Reference Figure 5 The pop-up spring 42 drives the pop-up plate 421 to move away from the ground, that is, when the pop-up plate 421 is located in the annular groove 41, the pop-up spring 42 is in a compressed state; when the pop-up plate 421 extends out of the annular groove 41, the pop-up spring 42 is in a non-stressed state. A heating wire 422 is provided on the pop-up plate 421, and the heating wire 422 extends along the circumference of the support portion 22. The heating wire 422 is directly opposite to the sealing block 222, so that the heating wire 422 can heat the sealing block 222.

[0045] Reference Figure 5 The fixing ring 4 is provided with a limiting assembly 5 for blocking the opening of the ring groove 41, and the limiting assembly 5 includes a limiting ring 51 and a limiting block 52. The limiting ring 51 is sleeved on the support portion 22, and the limiting block 52 is integrally formed on the surface of the limiting ring 51.

[0046] Reference Figure 4 and Figure 5 The groove wall of the annular groove 41 is provided with a limiting groove 43 for inserting the limiting block 52, and the end surface of the fixing ring 4 is provided with a through hole 431 connected to the limiting groove 43, and the through hole 431 is for the limiting block 52 to pass through. When the limiting block 52 is located in the limiting groove 43, the limiting ring 51 can block the opening of the ring groove 41 on one side, and the heating wire 422 is fixed in the annular groove 41; when the limiting block 52 is located in the through hole 431, the limiting ring 51 can be separated from the fixing ring 4, and the staff can take out the heating wire 422.

[0047] Reference Figure 4 A water storage tank 31 is provided on the surface of the cooling ring 3 away from the ground, and the water storage tank 31 surrounds the cooling ring 3 in the circumferential direction. A water storage slope 311 is provided on the surface of the cooling ring 3 away from the ground, and the water storage slope 311 is connected to the water storage tank 31. The distance between the water storage slope 311 and the support part 22 gradually increases in the vertical upward direction. The water storage slope 311 is located on the side of the water storage tank 31 away from the support part 22.

[0048] Reference Figure 4 Two water-absorbing sponges 32 are bonded in the water storage tank 31, and the water-absorbing sponges 32 extend along the length direction of the support portion 22. A plurality of water-absorbing strips 321 are integrally formed on the surface of the water-absorbing sponge 32, and the plurality of water-absorbing strips 321 extend in a direction perpendicular to the length direction of the water-absorbing sponge 32, and the plurality of water-absorbing strips 321 are arranged in an array along the length direction of the water-absorbing sponge 32. When the water-absorbing strips 321 absorb enough water, the end of the water-absorbing strips 321 away from the water-absorbing sponge 32 falls due to gravity, so that the staff can directly observe the amount of water absorbed by the water-absorbing sponge 32 to choose whether to replace the water-absorbing sponge 32.

[0049] Reference Figure 5 The groove wall of the limiting groove 43 is provided with a sliding groove 44, and the sliding groove 44 extends in the vertical direction. A sliding spring 441 is fixedly connected to the bottom wall of the sliding groove 44, and a limiting strip 442 is fixedly connected to the bottom wall of the sliding spring 441 away from the sliding groove 44. The sliding spring 441 drives the limiting strip 442 to be inserted into the limiting groove 43. When the limiting strip 442 is located in the limiting groove 43, the sliding spring 441 is in a non-stressed state; when the limiting strip 442 is located in the sliding groove 44, the sliding spring 441 is in a compressed state.

[0050] Reference Figure 5 and Figure 6 A limiting slope 443 is provided on the surface of the limiting strip 442 , and the distance between the limiting slope 443 and the sliding spring 441 gradually increases along the direction in which the limiting block 52 is inserted into the limiting groove 43 , and the limiting slope 443 is located in the insertion path of the limiting block 52 .

[0051] Reference Figure 5 A placement strip 332 is fixedly connected to the surface of the water-absorbing sponge 32, and a receiving groove 45 for inserting the water-absorbing sponge 32 is provided on the outer surface of the fixing ring 4, and the receiving groove 45 penetrates to the end surface of the fixing ring 4. A placement hole 451 communicating with the limiting groove 43 is provided on the bottom wall of the receiving groove 45, and the placement strip 332 is inserted into the placement hole 451. A placement groove 444 for inserting the placement strip 332 is provided on the surface of the limiting strip 442.

[0052] Reference Figure 5 When the limiting block 52 is inserted into the limiting groove 43, the limiting block 52 drives the limiting bar 442 to move through the limiting slope 443, so that the placement groove 444 is aligned with the placement hole 451, and the placement bar 332 can pass through the placement hole 451 and be inserted into the placement groove 444. At this time, the absorbent sponge 32 is completely located in the accommodating groove 45.

[0053] Reference Figure 3 and Figure 5A stop ring 46 is rotatably connected to the outer surface of the fixing ring 4, and a through hole 461 is provided on the stop ring 46 for the water-absorbing sponge 32 to pass through. When the through hole 461 is aligned with the receiving groove 45, the water-absorbing sponge 32 can be located in the receiving groove 45; when the stop ring 46 blocks the receiving groove 45, the water-absorbing sponge 32 is difficult to escape from the receiving groove 45.

[0054] The implementation principle of Example 2 is as follows: the staff rotates the stop ring 46 to align the through hole 461 with the receiving groove 45, and then takes the absorbent sponge 32 out of the receiving groove 45. At this time, the placement bar 332 is disengaged from the placement groove 444, and the sliding spring 441 can drive the placement bar 332 to move. The staff rotates the limit ring 51 to allow the limit block 52 to move from the limit groove 43 to the perforation 431 to disengage from the fixing ring 4, and finally the pop-up spring 42 drives the pop-up plate 421 to move, so that the heating wire 422 can be replaced.

[0055] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A low temperature wedge type single box gate valve, comprising a valve body (1), a support frame (2) being provided on the valve body (1), a valve stem (24) being slidably connected inside the support frame (2), a sealing block (222) being provided between the valve stem (24) and the support frame (2), characterized in that: A cooling ring (3) is provided on the support frame (2), the cooling ring (3) surrounds the support frame (2) along the circumference, and the diameter of the cooling ring (3) is greater than the diameter of the support frame (2); The support frame (2) is sleeved with a heating wire (422), the heating wire (422) is located outside the sealing block (222), and the heating wire (422) is used to heat the sealing block (222); The support frame (2) is provided with a fixing ring (4), the fixing ring (4) is provided with a ring groove (41) for placing the heating wire (422), the ring groove (41) penetrates to the side of the fixing ring (4), and the fixing ring (4) is provided with a limit assembly (5) for sealing the opening of the ring groove (41); The limiting assembly (5) comprises a limiting ring (51) and a limiting block (52); the limiting ring (51) is rotatably connected to the support frame (2); the limiting block (52) is arranged on the limiting ring (51); a limiting groove (43) for the limiting block (52) to be inserted is provided on the fixing ring (4); a through hole (431) communicating with the limiting groove (43) is provided on the fixing ring (4); the through hole (431) is for the limiting block (52) to pass through; when the limiting block (52) is inserted into the limiting groove (43), the limiting ring (51) blocks the opening penetrating the ring groove (41); when the limiting block (52) is located in the through hole (431), the limiting ring (51) can be separated from the fixing ring (4); The cooling ring (3) is provided with a water storage tank (31), the water storage tank (31) extends along the circumference of the cooling ring (3), and a water-absorbing sponge (32) for absorbing water is provided in the water storage tank (31); The water-absorbing sponge (32) is provided with a plurality of water-absorbing strips (321), and the plurality of water-absorbing strips (321) are distributed along the length direction of the water-absorbing sponge (32); The water-absorbing sponge (32) is provided with a placement strip (332), and the fixing ring (4) is provided with a placement hole (451) for inserting the placement strip (332); when the placement strip (332) is located in the placement hole (451), the water-absorbing sponge (32) is fixed on the fixing ring (4); The limiting ring (51) is slidably connected to a limiting strip (442), a limiting inclined surface (443) is provided on the limiting strip (442), the limiting block (52) can drive the limiting strip (442) to move via the limiting inclined surface (443), and a placement groove (444) is provided on the limiting strip (442) for inserting the placement strip (332); when the limiting block (52) is located in the limiting groove (43), the placement groove (444) is aligned with the placement hole (451); when the limiting strip (442) is not located in the limiting groove (43), the limiting strip (442) blocks the placement hole (451).

2. A low temperature wedge type single box gate valve according to claim 1, characterized in that: The fixing ring (4) is rotatably connected to a stop ring (46), the stop ring (46) is provided with a through hole (461) for the water-absorbing sponge (32) to pass through, and the fixing ring (4) is provided with a receiving groove (45) for the water-absorbing sponge (32) to be placed; when the limiting strip (442) is located in the placement groove (444), the water-absorbing sponge (32) is located in the receiving groove (45).

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