Low-temperature gate valve with movable sealing surface

Abstract

The utility model relates to the technical field of low-temperature gate valves, in particular to a low-temperature gate valve with a movable sealing surface, which comprises a valve body, a water inlet pipeline and a drainage pipeline are arranged in the valve body, the top of the valve body is communicated with an installation pipeline, and a closing piece is slidably connected in the installation pipeline through a valve rod. The closing piece is used for closing the water inlet pipeline, and the rubber plug is used for closing the mounting pipeline; wherein the periphery of the closing piece is wrapped with a sealing sleeve used for reducing abrasion, a connecting piece is arranged in the valve rod and used for disassembling and assembling the rubber plug, abrasion between the valve plate and the valve body can be reduced through the sealing sleeve, the service life of the valve plate can be prolonged, and when the valve plate is disassembled through the connecting piece, the sealing sleeve is not prone to falling off. And the rubber plug can be detached to block the mounting pipeline, so that the water inlet pipeline is in a sealed state while the valve plate is detached, and the valve plate can be replaced under the condition that normal circulation of a medium is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature gate valves, in particular to a low-temperature gate valve with a movable sealing surface. Background Art

[0002] Cryogenic gate valve is a valve used in low temperature environment, usually used in pipeline systems of cooling media such as liquefied natural gas, liquid nitrogen, liquid oxygen, etc. These valves are designed to operate normally at extremely low temperatures and ensure the safety and reliability of the system. Cryogenic gate valves usually use special materials and sealing designs to cope with problems such as temperature shrinkage and temperature creep that may occur in extremely low temperature environments.

[0003] In order to be able to cut off and circulate the medium in an extremely low temperature environment, it is necessary to use a low-temperature gate valve with a movable sealing surface to operate, such as the prior art Chinese patent announcement number "

[0004] CN116697073A" discloses a low-temperature gate valve with a movable sealing surface, comprising a valve body, a valve seat, a gate, a valve stem, a valve cover, a tube sheet, a soft sealing sleeve, and a pressure ring. The tube sheet is sleeved between the pressure rod and the valve cover. There are two soft sealing sleeves, which are respectively sleeved on the internal pipe opening of the valve body. There are two pressure rings, which are sleeved on the outer edge of the gate, and a guide block is installed on the pressure ring. A limiting groove is provided on the side of the gate, and the guide block is embedded in the limiting groove; and the prior art Chinese patent announcement number "CN115899293A" discloses a gate valve for reducing contact wear of the sealing surface, a filter mechanism is provided inside the water inlet area, and a cleaning mechanism is installed inside the filter mechanism, a water pressure and water flow detector is installed inside the water outlet area, and the upper valve body is connected to the bottom of the mounting sleeve through a plurality of sets of fixing bolts, and a protective box is provided on the top of the mounting sleeve.

[0005] Some cryogenic valve gates use the valve stem to drive the valve plate to move, and the valve plate uses a sealing sleeve to reduce the friction between the valve body and the valve body. However, in actual operation, it is considered that the sealing sleeve or the rubber plug will still wear out after long-term use and need to be replaced. However, because the installation channel cannot be blocked during the removal of the valve plate, the entire medium pipeline needs to be closed to prevent the medium from overflowing from the valve body during the replacement process, affecting the normal flow of the medium. Utility Model Content

[0006] The utility model aims to solve the defect in the prior art that when the valve plate is replaced, the valve body cannot be closed, which affects the normal flow of the medium, and proposes a cryogenic gate valve with a movable sealing surface.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A low-temperature gate valve with a movable sealing surface is designed, comprising a valve body, wherein a water inlet pipe and a drainage pipe are arranged in the valve body, and the top of the valve body is connected with an installation pipe, wherein a closing member is slidably connected in the installation pipe through a valve stem, and the closing member is used to close the water inlet pipe, and the valve body also comprises a rubber plug, and the rubber plug is used to close the installation pipe;

[0009] The periphery of the closing member is covered with a sealing sleeve for reducing wear, and a connecting member is provided inside the valve stem, and the connecting member is used for disassembling and assembling the rubber plug.

[0010] Furthermore, the installation pipe includes a base fixedly connected to the outer wall of the valve body, the top of the base is detachably connected to the shell via a connecting flange, a placement cavity is connected between the base and the interior of the shell, and the placement cavity extends to the bottom of the water inlet pipe to form a groove.

[0011] Furthermore, the closure member also includes a valve plate, the bottom of which is provided with the rubber plug, the rubber plug is engaged with the groove, and the rubber plug and the valve plate are both slidably connected with the placement cavity.

[0012] Furthermore, a plurality of evenly distributed annular tightening grooves are provided on the periphery of the sealing sleeve, and matching tightening belts are provided in the annular tightening grooves.

[0013] Furthermore, the connecting member includes a connecting rod, the valve stem is threadedly connected to the shell and is rotatably connected to the valve plate, a cavity is provided in the valve stem, the connecting rod is provided in the cavity, a threaded seat is embedded in the end face of the rubber plug, one end of the connecting rod is threadedly connected to the threaded seat via a thread line, and the rubber plug can close the base.

[0014] Furthermore, a handwheel is fixedly installed on the other end of the valve stem, the end of the connecting rod is rotatably connected to the valve stem through a damping bearing, and its axial end is extended and fixedly installed with a limit plate and a protrusion, and the handwheel can contact the limit plate.

[0015] The utility model proposes a low-temperature gate valve with a movable sealing surface, which has the beneficial effects that: the utility model can drive the valve plate to move through the valve stem, and the valve plate can reduce the wear between the valve body and the valve body by using the sealing sleeve, which is beneficial to extending the service life of the valve plate, and when the valve plate is disassembled by using the connecting piece, the rubber plug can be removed to block the installation pipe, so that the water inlet pipe is also in a sealed state when the valve plate is disassembled, and the valve plate can be replaced without affecting the normal circulation of the medium. The structure is simple, the operation is easy, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the closure member of the utility model;

[0019] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of area A;

[0020] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of area B.

[0021] In the figure: 1. valve body; 2. water inlet pipe; 3. drainage pipe; 4. installation pipe; 41. base; 42. shell; 43. placement cavity; 44. groove; 5. valve stem; 6. closing member; 61. rubber plug; 62. valve plate; 7. sealing sleeve; 71. tightening belt; 8. connecting member; 81. connecting rod; 82. handwheel; 83. limit plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-5 A low-temperature gate valve with a movable sealing surface comprises a valve body 1, wherein a water inlet pipe 2 and a drainage pipe 3 are arranged in the valve body 1, and a mounting pipe 4 is connected to the top thereof, wherein a closing member 6 is slidably connected to the mounting pipe 4 through a valve stem 5, and the closing member 6 is used to close the water inlet pipe 2, and the valve body also comprises a rubber plug 61, and the rubber plug 61 is used to close the mounting pipe 4;

[0024] The outer periphery of the closing member 6 is covered with a sealing sleeve 7 for reducing wear, and a connecting member 8 is provided inside the valve stem 5, and the connecting member 8 is used for disassembling and assembling the rubber plug 61;

[0025] Specifically, the valve stem 5 is a threaded rod, and is threadedly connected to the installation pipe 4 .

[0026] Furthermore, the installation pipe 4 includes a base 41 fixedly connected to the outer wall of the valve body 1, and the top of the base 41 is detachably connected to the shell 42 through a connecting flange. A placement cavity 43 is connected between the base 41 and the interior of the shell 42, and the placement cavity 43 extends to the bottom of the water inlet pipe 2 to form a groove 44.

[0027] Furthermore, the closing member 6 further includes a valve plate 62 , and the bottom of the valve plate 62 is provided with the rubber plug 61 , the rubber plug 61 is engaged with the groove 44 , and the rubber plug 61 and the valve plate 62 are both slidably connected with the placement cavity 43 .

[0028] It should be supplemented that the valve plate 62 and the rubber plug 61 are driven by the valve stem 5 to move into the placement cavity 43, so that the water inlet pipe 2 and the drainage pipe 3 are connected;

[0029] The rubber plug 61 is disposed in the groove 44 to ensure good sealing when the pipeline is cut off.

[0030] In more detail, a plurality of evenly distributed annular tightening grooves are provided on the periphery of the sealing sleeve 7, and matching tightening belts 71 are provided in the annular tightening grooves.

[0031] It is worth mentioning that the surface of the valve plate 62 body will rub against the placement cavity 43. By covering the sealing sleeve 7 on the outside of the valve plate 62 body, the existence of the sealing sleeve 7 can serve as an anti-wear medium, replacing the friction between the outer surface of the valve plate 62 body and the inner wall of the placement cavity 43; wherein, the sealing sleeve 7 is made of nitrile rubber, which has extremely strong wear resistance, and the nitrile rubber itself has a certain elasticity, so that the rigid seal between the sealing sleeve 7 and the placement cavity 43 is transformed into a soft seal. This sealing method has a higher degree of sealing and is less prone to wear. At the same time, the sealing sleeve 7 is provided with a number of evenly distributed annular tightening grooves, and the annular tightening grooves are provided with the tightening belt 71 matched therewith. The tightening belt 71 is made of elastic material. The existence of the tightening belt can share the force borne by the sealing sleeve 7 when it is deformed, thereby avoiding elastic fatigue caused by long-term deformation of the sealing sleeve 7, and extending the service life of the sealing sleeve 7.

[0032] In general, the connecting member 8 includes a connecting rod 81, the valve stem 5 is threadedly connected to the housing 42, and is rotatably connected to the valve plate 62, a cavity is provided in the valve stem 5, and the connecting rod 81 is provided in the cavity, a threaded seat is embedded in the end face of the rubber plug 61, one end of the connecting rod 81 is threadedly connected to the threaded seat through a thread line, and the rubber plug 61 can close the base 41.

[0033] It should be noted that, under the fixing action of the placement cavity 43, the rubber plug 61 is fixed to the connecting rod 81 by rotating the connecting rod 81, and because the rubber plug 61 is made of a rubber material with soft properties, the rubber plug 61 can fit tightly to the valve plate 62 when tightened.

[0034] Finally, a handwheel 82 is fixedly installed at the other end of the valve stem 5, the end of the connecting rod 81 is rotatably connected to the valve stem 5 through a damping bearing, and its axial end is extended and fixedly installed with a limit plate 83 and a protrusion, and the handwheel 82 can contact the limit plate 83.

[0035] In specific operation, the valve stem 5 contacts the limit plate 83 while rising, and then drives the connecting rod 81 to rise, and the connecting rod 81 drives the rubber plug 61 to rise with it, and when it falls, the protrusion is pressed to make the connecting rod 81 fall with it;

[0036] The damping bearing is used to prevent the connecting rod 81 from rotating due to accidental touching, and the inner wall of the placement cavity 43 is provided with an anti-slip pad. After the rubber plug 61 is pressed tightly against the rubber pads on both sides, the placement cavity 43 can be closed, and then the shell 42 can be disassembled to replace the valve plate 62.

[0037] Working mode: When working, the valve stem 5 is rotated to drive the valve plate 62 to rise, and at the same time, because the hand wheel 82 abuts against the limit plate 83, the connecting rod 81 will be driven to rise together, and the connecting rod 81 will drive the rubber plug 61 to rise with it;

[0038] Afterwards, the connecting rod 81 is rotated to separate it from the rubber plug 61. At this time, the rubber plug 61 is in the base 41 and is pressed tightly against the anti-slip pads on both sides, thereby closing the placement cavity 43.

[0039] Because the placement cavity 43 has a sufficient length, the valve plate 62 is separated from the rubber plug 61, and the housing 42 is disassembled to replace the valve plate 62.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cryogenic gate valve with a movable sealing surface, comprising a valve body (1), characterized in that: The valve body (1) is provided with a water inlet pipe (2) and a drainage pipe (3), and the top of the valve body (1) is connected to a mounting pipe (4). A closing member (6) is slidably connected to the mounting pipe (4) via a valve stem (5). The closing member (6) is used to close the water inlet pipe (2). The valve body (1) also includes a rubber plug (61). The rubber plug (61) is used to close the mounting pipe (4). The outer periphery of the closing member (6) is covered with a sealing sleeve (7) for reducing wear, and a connecting member (8) is provided inside the valve stem (5), and the connecting member (8) is used for disassembling and assembling the rubber plug (61).

2. A cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that: The installation pipe (4) comprises a base (41) fixedly connected to the outer wall of the valve body (1); the top of the base (41) is detachably connected to a shell (42) via a connecting flange; a placement cavity (43) is communicated between the base (41) and the interior of the shell (42); the placement cavity (43) extends to the bottom of the water inlet pipe (2) to form a groove (44).

3. A cryogenic gate valve with a movable sealing surface according to claim 2, characterized in that: The closing member (6) further comprises a valve plate (62), the bottom of which is provided with the rubber plug (61), the rubber plug (61) being engaged with the groove (44), and both the rubber plug (61) and the valve plate (62) are slidably connected with the placement cavity (43).

4. A cryogenic gate valve with a movable sealing surface according to claim 1, characterized in that: The outer periphery of the sealing sleeve (7) is provided with a plurality of evenly distributed annular tightening grooves, and matching tightening belts (71) are provided in the annular tightening grooves.

5. A cryogenic gate valve with a movable sealing surface according to claim 3, characterized in that: The connecting member (8) includes a connecting rod (81), the valve stem (5) is threadedly connected to the housing (42) and is rotatably connected to the valve plate (62), a cavity is provided in the valve stem (5), the connecting rod (81) is provided in the cavity, a threaded seat is embedded in the end face of the rubber plug (61), one end of the connecting rod (81) is threadedly connected to the threaded seat via a thread line, and the rubber plug (61) can close the base (41).

6. A cryogenic gate valve with a movable sealing surface according to claim 5, characterized in that: A hand wheel (82) is fixedly mounted on the other end of the valve stem (5); the end of the connecting rod (81) is rotatably connected to the valve stem (5) via a damping bearing, and a limit plate (83) and a protrusion are extended and fixedly mounted on the axial end thereof; the hand wheel (82) is capable of contacting the limit plate (83).

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