Low-temperature gate valve with movable sealing surface

Abstract

The low-temperature gate valve with the movable sealing face comprises a valve body, the valve body comprises a circulation pipeline and an installation pipeline, the outer wall of the top of the installation pipeline is in flange connection with a closed shell, and the closed shell and the inner wall of the installation pipeline are provided with the same containing cavity. A plug and a valve plate are in sliding fit with the inner wall of the containing cavity, a valve rod is in threaded connection with the inner wall of the closed shell, a cavity is formed in the valve rod, a connecting rod is in sliding fit with the inner wall of the cavity, two opposite sliding grooves are formed in the side wall of the bottom end of the connecting rod, and limiting grooves are formed in the side walls of the top ends of the two sliding grooves. An inserting groove is formed in the outer wall of the top of the plug, a sliding cavity is formed in the side wall of the inserting groove, and a limiting ball head is slidably matched with the inner wall of the sliding cavity; through the arrangement of the limiting ball head, the spring and the sliding groove, when the connecting rod is connected with the plug, connection can be completed after the connecting rod rotates by a certain angle, multiple circles of rotation are not needed, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a cryogenic gate valve with a movable sealing surface. Background Technology

[0002] Cryogenic gate valves are valves used to control fluid flow in cryogenic environments. They can withstand high pressure and high temperature differences in extreme cryogenic environments, ensuring the safe operation of the system. They are widely used in liquefied natural gas, aerospace, nuclear energy, metallurgy and chemical industries.

[0003] A search revealed a Chinese patent publication number CN222910810U, which discloses a cryogenic gate valve with a movable sealing surface. The valve body includes an inlet pipe and a drain pipe, and its top is connected to an installation pipe. A closing element is slidably connected to the installation pipe via a valve stem. This patent allows the installation pipe to be blocked by a rubber plug when the valve plate is replaced. Thus, the placement cavity is closed while the valve plate is being disassembled, allowing the valve plate to be replaced without affecting the normal flow of the medium.

[0004] However, when assembling and disassembling the connecting rod and the rubber plug, the connecting rod needs to be manually rotated several times before assembly or disassembly, which is time-consuming and inconvenient for users. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cryogenic gate valve with a movable sealing surface.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cryogenic gate valve with a movable sealing surface includes a valve body, which includes a flow pipe and an installation pipe. A sealing shell is flanged to the top outer wall of the installation pipe. The sealing shell and the inner wall of the installation pipe share the same placement cavity. A plug and a valve plate are slidably fitted to the inner wall of the placement cavity. A valve stem is threaded to the inner wall of the sealing shell. A cavity is provided inside the valve stem. A connecting rod is slidably fitted to the inner wall of the cavity. An annular protrusion that abuts against the top of the valve stem is provided on the top side wall of the connecting rod. Two opposing sliding grooves are provided on the bottom side wall of the connecting rod. A limit groove is provided on the top side wall of both sliding grooves. An insertion groove is provided on the top outer wall of the plug. A limit block is provided on the inner wall of the insertion groove. The limit block is slidably fitted to the sliding groove. A sliding cavity is provided on the side wall of the insertion groove. A limit ball is slidably fitted to the inner wall of the sliding cavity. A spring is fixedly connected to one end of the limit ball. The other end of the spring is connected to the inner wall of the sliding cavity. An arc-shaped groove that limits the movement of the limit ball is provided on the side wall of the connecting rod.

[0008] As a further improvement of this utility model: the valve plate is located above the plug, and the inner wall of the top of the placement cavity in the installation pipe is provided with a protective pad that abuts against the plug.

[0009] As a further improvement of this utility model: the outer wall of the valve plate is covered with a sealing sleeve, and a handwheel is fixedly connected to the top of the valve stem.

[0010] As a further embodiment of this utility model: the bottom end of the valve stem is rotatably connected to a pressure plate, the pressure plate slides along the inner wall of the placement cavity, and the pressure plate is connected to the top of the valve plate.

[0011] As a further improvement of this utility model, a filter plate is provided at the liquid inlet end of the flow pipe of the valve body.

[0012] As a further improvement of this utility model: the inner wall of the flow pipe of the valve body is provided with a stepped groove, and the side wall of the stepped groove is provided with multiple connection holes.

[0013] As a further embodiment of this utility model: a connecting block is fixed to the side wall of the filter plate, the connecting block is inserted into the connecting hole, and a positioning magnetic sheet is fixed to one end of the connecting block and the inner wall of the connecting hole, and the two positioning magnetic sheets are magnetically attracted to each other.

[0014] Compared with the prior art, this utility model provides a cryogenic gate valve with a movable sealing surface, which has the following advantages:

[0015] 1. This utility model, by setting a limiting ball head, a spring and a sliding groove, allows the connecting rod to be rotated at a certain angle to complete the connection when connecting the plug, without needing to rotate multiple times, making it easy to operate.

[0016] 2. This utility model, by providing a filter plate, can filter the fluid and intercept solid particles that may be mixed in the fluid, such as pipe rust, to prevent solid particles from entering the placement chamber and causing the valve plate and plug to move and get stuck or increasing the wear rate of the plug.

[0017] 3. This utility model, by providing a connecting block, a connecting hole, and positioning magnets, allows the filter plate to be placed in the installation pipe during installation. The connecting block is inserted with the connecting hole aligned, and the filter plate is fixed by the magnetic attraction of the two positioning magnets, which facilitates the installation of the filter plate.

[0018] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a cryogenic gate valve with a movable sealing surface proposed in this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of a cryogenic gate valve with a movable sealing surface proposed in this utility model.

[0021] Figure 3 This is a partial structural diagram of a cryogenic gate valve with a movable sealing surface proposed in this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of a cryogenic gate valve connecting rod with a movable sealing surface proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the connection structure between the filter plate and the valve body of a cryogenic gate valve with a movable sealing surface, as proposed in this utility model.

[0024] In the diagram: 1. Valve body; 2. Enclosed housing; 3. Valve stem; 4. Handwheel; 5. Connecting rod; 6. Valve plate; 7. Plug; 8. Sealing sleeve; 9. Limiting ball head; 10. Spring; 11. Sliding groove; 12. Arc groove; 13. Placement cavity; 14. Filter plate; 15. Connecting block; 16. Connecting hole; 17. Positioning magnet. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example 1

[0028] A cryogenic gate valve with a movable sealing surface, such as Figures 1 to 4As shown, the device includes a valve body 1, which includes a flow pipe and an installation pipe. A flange on the top outer wall of the installation pipe is connected to a closed housing 2. The closed housing 2 and the inner wall of the installation pipe have the same placement cavity 13. A plug 7 and a valve plate 6 are slidably fitted on the inner wall of the placement cavity 13. The valve plate 6 is located above the plug 7. A protective gasket that abuts against the plug 7 is provided on the top inner wall of the placement cavity 13 in the installation pipe. A sealing sleeve 8 is covered on the outer wall of the valve plate 6. A valve stem 3 is threadedly connected to the inner wall of the closed housing 2. A handwheel 4 is fixedly connected to the top of the valve stem 3. A pressure plate is rotatably connected to the bottom of the valve stem 3. The pressure plate is slidably fitted along the inner wall of the placement cavity 13 and is connected to the top of the valve plate 6. A cavity is provided inside the valve stem 3. A connecting rod 5 is slidably fitted on the inner wall of the cavity.

[0029] The top sidewall of the connecting rod 5 is provided with an annular protrusion that abuts against the top of the valve stem 3. The bottom sidewall of the connecting rod 5 has two opposing sliding grooves 11. The top sidewall of each sliding groove 11 has a limiting groove. The top outer wall of the plug 7 has an insertion groove. The inner wall of the insertion groove has a limiting block. The limiting block slides with the sliding groove 11. The sidewall of the insertion groove has a sliding cavity. The inner wall of the sliding cavity slides with a limiting ball head 9. One end of the limiting ball head 9 is fixedly connected to a spring 10. The other end of the spring 10 is connected to the inner wall of the sliding cavity. The sidewall of the connecting rod 5 has an arc-shaped groove 12 that limits and cooperates with the limiting ball head 9.

[0030] When opening and closing the gate valve, the user turns the handwheel 4, causing the valve stem 3 to rotate and move. The valve plate 6 and the sealing sleeve 8 move synchronously with the valve stem 3. When the valve stem 3 moves upward, the top of the valve stem 3 moves the connecting rod 5 upward through the annular protrusion, and the plug 7 moves upward synchronously. When the valve stem 3 moves downward, the valve plate 6 moves downward and squeezes the plug 7, causing the plug 7 to move downward along the placement cavity 13. When the sealing sleeve 8 wears after long-term use and the valve plate 6 and sealing sleeve 8 need to be replaced, turn the handwheel 4 to move the valve plate 6 and the plug 7 upward until the plug 7 moves into the installation pipeline, where the anti-slip pad is pressed against the plug 7 and fixed, thus sealing the installation pipeline. Then, turn the connecting rod 5 to make the arc groove 12 squeeze the limiting ball head 9, causing the spring 10 to compress and deform, and the limiting ball head 9... Entering the buffer chamber, the limiting block located inside the limiting groove moves to the top of the sliding groove 11. At this time, the connecting rod 5 can be pulled upward, and the limiting block slides along the sliding groove 11, separating the connecting rod 5 from the plug 7. Then, the bolts are removed to remove the closed housing 2, and the valve plate 6 and sealing sleeve 8 are replaced. After the replacement is completed, the closed housing 2 is connected to the installation pipeline. The bottom end of the connecting rod 5 is inserted into the insertion groove along the cavity, and the limiting block enters the sliding groove 11. After the connecting rod 5 is fully inserted, the connecting rod 5 rotates at a certain angle, and the limiting block enters the limiting groove, connecting the connecting rod 5 to the plug 7. At this time, the limiting ball head 9 is pushed into the arc groove 12 by the spring 10 to limit the rotation of the connecting rod 5.

[0031] By setting a limiting ball head 9, a spring 10, and a sliding groove 11, when the connecting rod 5 is connected to the plug 7, the connection can be completed by rotating the connecting rod 5 at a certain angle without having to rotate it multiple times, making the operation convenient.

[0032] Example 2

[0033] A cryogenic gate valve with a movable sealing surface is described in this embodiment, which is based on Embodiment 1 and makes the following improvements, such as... Figure 2 , Figure 5 As shown, a filter plate 14 is provided at the liquid inlet end of the flow pipe of the valve body 1. A stepped groove is provided on the inner wall of the flow pipe of the valve body 1. Multiple connection holes 16 are opened on the side wall of the stepped groove. A connecting block 15 is fixed on the side wall of the filter plate 14. The connecting block 15 is inserted into the connection hole 16. A positioning magnetic piece 17 is fixed on one end of the connecting block 15 and the inner wall of the connection hole 16. The two positioning magnetic pieces 17 are magnetically attracted to each other.

[0034] When the fluid flows along the inner wall of the flow pipe, the filter plate 14 can filter the fluid and intercept solid particles that may be mixed in the fluid, such as pipe rust, to prevent solid particles from entering the placement cavity 13 and causing the valve plate 6 and plug 7 to move and get stuck or increase the wear rate of the plug 7. When installing the filter plate 14, place the filter plate 14 in the installation pipe, insert the connecting block 15 into the connecting hole 16, and fix the filter plate 14 by the magnetic attraction of the two positioning magnets 17.

[0035] By installing the filter plate 14, the fluid can be filtered to intercept solid particles that may be mixed in the fluid, such as pipe rust, and prevent solid particles from entering the placement chamber 13, which could cause the valve plate 6 and the plug 7 to move and get stuck or increase the wear rate of the plug 7.

[0036] With the connection block 15, connection hole 16 and positioning magnet 17 provided, when installing the filter plate 14, the filter plate 14 is placed in the installation pipe, the connection block 15 is inserted into the connection hole 16, and the filter plate 14 is fixed by the magnetic attraction of the two positioning magnets 17, which facilitates the installation of the filter plate 14.

[0037] Working principle: When opening and closing the gate valve, the user turns the handwheel 4, causing the valve stem 3 to rotate and move. The valve plate 6 and sealing sleeve 8 move synchronously with the valve stem 3. When the valve stem 3 moves upward, the top of the valve stem 3 drives the connecting rod 5 to move upward through the annular protrusion, and the plug 7 moves upward synchronously. When the valve stem 3 moves downward, the valve plate 6 moves downward and squeezes the plug 7, causing the plug 7 to move downward along the placement cavity 13. When the sealing sleeve 8 wears after long-term use and the valve plate 6 and sealing sleeve 8 need to be replaced, turn the handwheel 4 to move the valve plate 6 and plug 7 upward until the plug 7 moves into the installation pipeline. The anti-slip pad is pressed and fixed against the plug 7, thus sealing the installation pipeline. Then, turn the connecting rod 5 to make the arc groove 12 squeeze the limiting ball head 9, causing the spring 10 to compress and deform. The limiting ball head 9 enters the buffer cavity, and the limiting block located in the limiting groove moves to the top of the sliding groove 11. At this time, the connecting rod 5 can be pulled upward, and the limiting block slides along the sliding groove 11, separating the connecting rod 5 from the plug 7. Then, disassemble. The bolts are used to remove the sealed housing 2, and the valve plate 6 and sealing sleeve 8 are replaced. After replacement, the sealed housing 2 is connected to the installation pipe. The bottom end of the connecting rod 5 is inserted into the insertion groove along the cavity, and the limiting block enters the sliding groove 11. After the connecting rod 5 is fully inserted, the connecting rod 5 rotates at a certain angle, and the limiting block enters the limiting groove, so that the connecting rod 5 is connected to the plug 7. At this time, the limiting ball head 9 is pushed into the arc groove 12 by the spring 10 to limit the rotation of the connecting rod 5. When the fluid flows along the inner wall of the flow pipe, the filter plate 14 can filter the fluid and intercept solid particles that may be mixed in the fluid, such as pipe rust, to prevent solid particles from entering the placement cavity 13 and causing the valve plate 6 and plug 7 to move and get stuck or increasing the wear rate of the plug 7. When installing the filter plate 14, the filter plate 14 is placed in the installation pipe, and the connecting block 15 is inserted into the connecting hole 16. The filter plate 14 is fixed by the magnetic attraction of the two positioning magnetic pieces 17.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cryogenic gate valve with a movable sealing surface, comprising a valve body (1), characterized in that, The valve body (1) includes a flow pipe and an installation pipe. A flange is connected to the outer wall of the top of the installation pipe to a closed housing (2). The closed housing (2) and the inner wall of the installation pipe have the same placement cavity (13). A plug (7) and a valve plate (6) are slidably fitted on the inner wall of the placement cavity (13). A valve stem (3) is threadedly connected to the inner wall of the closed housing (2). A cavity is provided inside the valve stem (3). A connecting rod (5) is slidably fitted on the inner wall of the cavity. An annular protrusion is provided on the top side wall of the connecting rod (5) to limit and abut against the top of the valve stem (3). The bottom sidewall has two opposing sliding grooves (11), and the top sidewall of each sliding groove (11) has a limiting groove. The top outer wall of the plug (7) has an insertion groove, and the inner wall of the insertion groove has a limiting block. The limiting block slides with the sliding groove (11). The sidewall of the insertion groove has a sliding cavity, and the inner wall of the sliding cavity slides with a limiting ball head (9). One end of the limiting ball head (9) is fixedly connected to a spring (10), and the other end of the spring (10) is connected to the inner wall of the sliding cavity. The sidewall of the connecting rod (5) has an arc-shaped groove (12) that limits the movement of the limiting ball head (9).

2. The cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that, The valve plate (6) is located above the plug (7), and the inner wall of the top of the placement cavity (13) in the installation pipe is provided with a protective pad that abuts against the plug (7).

3. A cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that, The valve plate (6) is covered with a sealing sleeve (8) on its outer wall, and a handwheel (4) is fixedly connected to the top of the valve stem (3).

4. A cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that, The bottom end of the valve stem (3) is rotatably connected to a pressure plate, which slides along the inner wall of the placement cavity (13) and is connected to the top end of the valve plate (6).

5. A cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that, The valve body (1) is equipped with a filter plate (14) at the liquid inlet end of the flow pipe.

6. A cryogenic gate valve with a movable sealing surface according to claim 5, characterized in that, The valve body (1) has a stepped groove on the inner wall of the flow channel, and multiple connection holes (16) are provided on the side wall of the stepped groove.

7. A cryogenic gate valve with a movable sealing surface according to claim 6, characterized in that, The filter plate (14) has a connecting block (15) fixed on its side wall. The connecting block (15) is inserted into the connecting hole (16). A positioning magnetic piece (17) is fixed on one end of the connecting block (15) and the inner wall of the connecting hole (16). The two positioning magnetic pieces (17) are magnetically attracted to each other.

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