Natural gas pipeline stop valve

Abstract

The utility model provides a natural gas pipeline stop valve, which relates to the technical field of natural gas transportation and comprises a shell, a gas inlet is arranged on one side of the shell, a gas outlet is arranged at the lower end of the shell, a cylinder is fixedly mounted at the upper end of the shell, and the output end of the cylinder extends into the shell and is fixedly provided with a plugging plate. After the air outlet is blocked by the blocking plate, the connecting ring moves to the position between the two clamping plates, then a worker starts the motor to enable an output shaft of the motor to drive the two-way lead screw to rotate, the rotating two-way lead screw drives the two clamping plates to move relatively in a thread screwing-in mode, and then the air outlet is blocked by the blocking plate. The sealing plate is attached to the outer wall of the connecting ring and supports the connecting ring and the sealing plate, deformation of the sealing plate under high air pressure is avoided, and natural gas leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas transportation, and particularly relates to a natural gas pipeline cut-off valve. Background Technique

[0002] The natural gas pipeline cut-off valve is an important safety supporting device for gas pipeline projects. It is mainly used to be connected with a combustible gas leakage monitoring instrument. When the instrument detects the leakage of combustible gas, it automatically and quickly closes the main gas supply valve, cuts off the gas supply, and timely prevents the occurrence of serious accidents. A cut-off valve with the publication number of CN206563122U in the prior art includes a chamber, the chamber has an inlet and an outlet, a blocking plate is installed in the chamber, and the blocking plate is connected with an actuating device; when it is turned on, the inlet conveys materials to the outlet; when it is cut off, the actuating device drives the blocking plate to block the material conveying channel between the inlet and the outlet. The utility model has a simple structure, is convenient for the conveying of large-flow materials (especially non-fluid materials), and has simple control components, reducing the probability of controller errors and the like.

[0003] However, in this structure, when the blocking plate blocks the channel between the inlet and the outlet of the cut-off valve, due to the increase in air pressure in the chamber, the blocking plate is likely to be deformed, and the deformation of the blocking plate may cause the sealing surface between it and the valve seat to be not tight, thus causing leakage. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a natural gas pipeline cut-off valve, which can effectively solve the problem that when the blocking plate in the cut-off valve in the background technique blocks the channel between the inlet and the outlet of the cut-off valve, due to the increase in air pressure in the chamber, the blocking plate is likely to be deformed, and the deformation of the blocking plate may cause the sealing surface between it and the valve seat to be not tight, thus causing leakage.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A natural gas pipeline cut-off valve includes a housing. An air inlet is arranged on one side of the housing, an air outlet is arranged at the lower end of the housing, a cylinder is fixedly installed at the upper end of the housing, the output end of the cylinder extends into the housing and is fixedly installed with a blocking plate, and a connecting ring is fixedly installed at the upper end of the blocking plate through a plurality of connecting columns;

[0007] A support assembly for supporting the connecting ring is arranged on one side of the housing.

[0008] Preferably, the support assembly includes a bidirectional lead screw, the bidirectional lead screw is rotatably installed between two sides of the inner wall of the housing, moving plates are arranged on both sides of the lead screw body in a threaded manner, and clamping plates are fixedly installed on the opposite sides of the two moving plates;

[0009] A driving structure for driving the bidirectional lead screw to rotate is provided on one side of the housing.

[0010] Preferably, the driving structure includes a motor, the motor is fixedly installed on one side of the housing, and one end of the bidirectional lead screw passes through the housing and is fixedly connected to the output shaft end of the motor.

[0011] Preferably, a cross bar is fixedly installed between the two sides of the inner wall of the housing, and the two moving plates are respectively slidably arranged on both sides of the cross bar body.

[0012] Preferably, limiting grooves are formed on the opposite surfaces of the two clamping plates.

[0013] Preferably, an installation ring is sleeved on the column body of each connecting column, a plurality of installation blocks are fixedly installed on the upper surface of the plugging plate, and a traction rope is fixedly installed between each installation block and the corresponding plugging plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) After the plugging plate plugs the air outlet, the connecting ring moves between the two clamping plates. Then, the staff starts the motor, and its output shaft drives the bidirectional lead screw to rotate. The rotating bidirectional lead screw drives the two clamping plates to move relatively by means of screw-in, so that they are attached to the outer wall of the connecting ring and support the connecting ring and the plugging plate, avoiding deformation of the plugging plate under high air pressure and preventing natural gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of a natural gas pipeline cut-off valve of the utility model;

[0017] Figure 2 is a schematic top view structure diagram of a natural gas pipeline cut-off valve of the utility model;

[0018] Figure 3 is a schematic cross-sectional structure diagram of the A-A section of a natural gas pipeline cut-off valve of the utility model Figure 2 ;

[0019] Figure 4 is a schematic cross-sectional structure diagram of the B-B section of a natural gas pipeline cut-off valve of the utility model Figure 2 ;

[0020] Figure 5 is a schematic enlarged structure diagram of the structure at A of a natural gas pipeline cut-off valve of the utility model Figure 3 ;

[0021] In the figure: 1. Outer shell; 2. Air inlet; 3. Air outlet; 4. Cylinder; 5. Plugging plate; 6. Connecting column; 601. Connecting ring; 7. Support assembly; 701. Bidirectional lead screw; 702. Moving plate; 703. Clamping plate; 704. Driving structure; 7041. Motor; 8. Cross bar; 9. Limiting groove; 10. Mounting ring; 11. Mounting block; 12. Traction rope. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] As Figures 1 - 5 shown, a natural gas pipeline cut-off valve includes an outer shell 1. An air inlet 2 is arranged on one side of the outer shell 1, an air outlet 3 is arranged at the lower end of the outer shell 1, a cylinder 4 is fixedly installed at the upper end of the outer shell 1, the output end of the cylinder 4 extends into the outer shell 1 and is fixedly installed with a plugging plate 5, and a connecting ring 601 is fixedly installed at the upper end of the plugging plate 5 through a plurality of connecting columns 6;

[0024] A support assembly 7 for supporting the connecting ring 601 is arranged on one side of the outer shell 1.

[0025] The support assembly 7 includes a bidirectional lead screw 701. The bidirectional lead screw 701 is rotatably installed between the two inner walls of the outer shell 1. Moving plates 702 are threadedly arranged on both sides of the rod body of the bidirectional lead screw 701, and clamping plates 703 are fixedly installed on the opposite sides of the two moving plates 702;

[0026] A driving structure 704 for driving the bidirectional lead screw 701 to rotate is arranged on one side of the outer shell 1.

[0027] The driving structure 704 includes a motor 7041. The motor 7041 is fixedly installed on one side of the outer shell 1, and one end of the bidirectional lead screw 701 passes through the outer shell 1 and is fixedly connected to the output shaft end of the motor 7041.

[0028] A cross bar 8 is fixedly installed between the two inner walls of the outer shell 1, and the two moving plates 702 are respectively slidably arranged on both sides of the rod body of the cross bar 8.

[0029] The staff activates the cylinder 4, and its output shaft drives the sealing plate 5 to descend, enabling the sealing plate 5 to block the air outlet 3 and prevent natural gas from leaking from the air outlet 3. After the sealing plate 5 blocks the air outlet 3, the connecting ring 601 moves between the two clamping plates 703. Subsequently, the staff activates the motor 7041, and its output shaft drives the bidirectional lead screw 701 to rotate. The rotating bidirectional lead screw 701 drives the two clamping plates 703 to move relatively by means of screw-in, making them fit against the outer wall of the connecting ring 601 and supporting the connecting ring 601 and the sealing plate 5, preventing the sealing plate 5 from deforming under high air pressure and avoiding natural gas leakage.

[0030] In another embodiment of the present utility model, limiting grooves 9 are provided on the opposite surfaces of the two clamping plates 703.

[0031] By providing the limiting grooves 9, they can be inserted and matched with the connecting ring 601, thereby increasing the contact area between the clamping plates 703 and the connecting ring 601 and enhancing the supporting effect on the clamping plates 703.

[0032] In another embodiment of the present utility model, an installation ring 10 is sleeved on the body of each connecting column 6, and a plurality of installation blocks 11 are fixedly installed on the upper surface of the sealing plate 5. A traction rope 12 is fixedly installed between each installation block 11 and the corresponding sealing plate 5.

[0033] By providing the traction ropes 12, after the connecting ring 601 is supported, due to the traction of the traction ropes 12, the pressure received by the sealing plate 5 can be more evenly distributed, avoiding deformation caused by excessive local pressure.

[0034] The working principle of this natural gas pipeline cut-off valve:

[0035] During use, the staff activates the cylinder 4, and its output shaft drives the sealing plate 5 to descend, enabling the sealing plate 5 to block the air outlet 3 and prevent natural gas from leaking from the air outlet 3. After the sealing plate 5 blocks the air outlet 3, the connecting ring 601 moves between the two clamping plates 703. Subsequently, the staff activates the motor 7041, and its output shaft drives the bidirectional lead screw 701 to rotate. The rotating bidirectional lead screw 701 drives the two clamping plates 703 to move relatively by means of screw-in, making them fit against the outer wall of the connecting ring 601 and supporting the connecting ring 601 and the sealing plate 5, preventing the sealing plate 5 from deforming under high air pressure and avoiding natural gas leakage.

[0036] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or variations derived from the technical solutions of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A natural gas pipeline cut-off valve, comprising a housing (1), characterized in that: An air inlet (2) is provided on one side of the housing (1), an air outlet (3) is provided at the lower end of the housing (1), a cylinder (4) is fixedly installed at the upper end of the housing (1), the output end of the cylinder (4) extends into the housing (1) and is fixedly installed with a blocking plate (5), and a connecting ring (601) is fixedly installed at the upper end of the blocking plate (5) through a plurality of connecting columns (6); A support assembly (7) for supporting the connecting ring (601) is provided on one side of the housing (1).

2. The gas pipeline cut-off valve according to claim 1, characterized in that: The support assembly (7) includes a bidirectional lead screw (701), the bidirectional lead screw (701) is rotatably installed between the two inner walls of the housing (1), moving plates (702) are threadedly arranged on both sides of the rod body of the bidirectional lead screw (701), and clamping plates (703) are fixedly installed on the opposite sides of the two moving plates (702); A driving structure (704) for driving the bidirectional lead screw (701) to rotate is provided on one side of the housing (1).

3. The gas pipeline cut-off valve according to claim 2, characterized in that: The driving structure (704) includes a motor (7041), the motor (7041) is fixedly installed on one side of the housing (1), and one end of the bidirectional lead screw (701) passes through the housing (1) and is fixedly connected to the output shaft end of the motor (7041).

4. The gas pipeline cut-off valve according to claim 3, characterized in that: A cross bar (8) is fixedly installed between the two inner walls of the housing (1), and the two moving plates (702) are respectively slidably arranged on both sides of the rod body of the cross bar (8).

5. The gas pipeline cut-off valve according to claim 4, characterized in that: Limiting grooves (9) are formed on the opposite surfaces of the two clamping plates (703).

6. The gas pipeline cut-off valve according to claim 1, wherein: An installation ring (10) is sleeved on the column body of each connecting column (6), a plurality of installation blocks (11) are fixedly installed on the upper surface of the blocking plate (5), and a traction rope (12) is fixedly installed between each installation block (11) and the corresponding blocking plate (5).

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