Gas valve capable of being cut off emergently

Abstract

The utility model discloses a gas valve capable of being cut off emergently, which is characterized in that a valve body is provided with a positioning frame, the positioning frame is provided with a limiting barrel for a valve rod to pass through, the upper end of the part of the valve rod outside the valve body is provided with a stop dog, and a compression spring sleeved on the valve rod is arranged between the stop dog and the limiting barrel; a vertically-downward electric cylinder is further installed at the top of the positioning frame, a spline shaft is arranged at the telescopic end of the electric cylinder, an insertion cavity allowing the spline shaft to be inserted is formed in the valve rod, the valve rod and the spline shaft are fixed through a plug pin, and the valve rod and the spline shaft are each provided with a through hole allowing the plug pin to penetrate through. In emergency, the bolt can be pulled out, the compression spring performs elastic recovery, and the valve rod is driven to quickly descend, so that the valve core and the valve hole are tightly closed, and the quick cut-off effect is achieved; in this way, cutting-off can still be conducted quickly under the power-off condition.

Description

Technical Field

[0001] This utility model relates to the technical field of gas valves, specifically a gas valve capable of emergency shut-off. Background Technology

[0002] Based on their function and purpose, gas valves can be divided into three types. One type is the shut-off valve, also known as a closed-loop valve, which connects or shuts off the flow of gas in a pipeline. Existing ordinary shut-off valves use a screw to raise or lower the valve disc, thereby cutting off or opening the flow path of the valve body. To close the shut-off valve, the screw needs to be turned many times. In the event of a power outage emergency, the shut-off valve needs to be closed manually by turning the screw, which is time-consuming and laborious. Especially in the event of a fire, it poses a serious threat to the life safety of the operator. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a gas valve capable of emergency shut-off.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses an emergency shut-off gas valve, comprising a valve body, an inlet channel and an outlet channel, and a partition separating the inlet and outlet channels within the valve body's inner cavity. The partition is horizontally positioned and has a valve hole. A valve stem extending into the valve body is mounted on the valve body, and a valve core for opening and closing the valve hole is mounted on the valve stem. A positioning frame is mounted on the valve body, and a limiting cylinder for the valve stem to pass through is provided on the positioning frame. A stop block is provided at the upper end of the portion of the valve stem outside the valve body, and a compression spring fitted onto the valve stem is provided between the stop block and the limiting cylinder.

[0006] The top of the positioning frame is also equipped with a vertically downward electric cylinder, wherein the telescopic end of the electric cylinder is provided with a spline shaft, and the valve stem is provided with a cavity for inserting the spline shaft, and the valve stem and the spline shaft are fixed by a pin, and both the valve stem and the spline shaft are provided with through holes through which the pin passes.

[0007] As a preferred embodiment of this utility model, the valve body is provided with an installation port, and a valve cover is fixed on the valve body to close the installation port. The valve cover is provided with an installation hole for the valve stem to pass through, and the valve cover is also provided with a sealing mechanism for sealing the connection between the valve cover and the valve body.

[0008] As a preferred embodiment of this utility model, the valve core has an inverted frustum-shaped structure that is narrow at the bottom and wide at the top, and the surface of the valve core has a soft rubber sealing layer; the inner contour of the valve hole is adapted to the valve core, and a rubber buffer sealing layer is provided on the inner wall of the valve hole.

[0009] As a preferred technical solution of this utility model, the valve body, the partition and the valve core are all made of high-strength material.

[0010] As a preferred technical solution of this utility model, a buffer anti-collision mechanism is provided between the valve stem and the valve core. The buffer anti-collision mechanism includes a vertically upward telescopic rod provided on the back side of the valve core, and the inner end of the valve stem is provided with a telescopic cavity for the telescopic rod to be inserted and telescopically extended. A limiting block is provided on the valve stem, and a buffer spring is installed between the limiting block and the back side of the valve core.

[0011] The beneficial effects of this utility model are:

[0012] 1. In this type of emergency shut-off gas valve, the valve stem is normally raised and lowered by an electric cylinder, which in turn drives the valve core to close the valve orifice. In an emergency, when the electric cylinder is de-energized, the valve stem rises when the shut-off valve is open, and the pressure spring is in a compressed state. The pressure spring in the compressed state exerts a downward thrust on the stop block and the valve stem. In an emergency, the pin can be pulled out, and the pressure spring will elastically return to its original position, causing the valve stem to descend rapidly, so that the valve core and the valve orifice are tightly closed, thus achieving the function of rapid shut-off. In this way, it can still quickly shut off even when the power is off.

[0013] 2. The valve stem and valve core of this type of emergency shut-off gas valve are equipped with a buffer anti-collision mechanism. When the pressure spring drives the valve stem to descend rapidly, the valve core and valve hole are in elastic contact, which avoids severe instantaneous impact force and easy deformation. The elastic deformation of the buffer spring is used to absorb the instantaneous impact force. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a gas valve capable of emergency shut-off according to the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a buffer and anti-collision mechanism for a gas valve that can be shut off in an emergency according to this utility model.

[0017] Figure 3This is a schematic diagram of the valve body of a gas valve capable of emergency shut-off according to this utility model;

[0018] Figure 4 This is a schematic diagram of the pin structure of a gas valve capable of emergency shut-off according to this utility model;

[0019] Figure 5 This is a schematic diagram of the cavity structure of a gas valve capable of emergency shut-off according to this utility model.

[0020] In the diagram: 1. Valve body; 2. Inlet passage; 3. Outlet passage; 4. Baffle plate; 5. Valve hole; 6. Valve stem; 7. Valve core; 8. Positioning bracket; 9. Limiting cylinder; 10. Compression spring; 11. Electric cylinder; 12. Splined shaft; 13. Insert cavity; 14. Pin; 15. Through hole; 16. Mounting port; 17. Valve cover; 18. Mounting hole; 19. Rubber sealing layer; 20. Rubber buffer sealing layer; 21. Stop block; 22. Limiting block; 23. Telescopic rod; 24. Buffer spring. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example: Figure 1-5 As shown, this utility model discloses an emergency shut-off gas valve, comprising a valve body 1, an inlet channel 2 and an outlet channel 3, and a partition 4 separating the inlet channel 2 and the outlet channel 3 within the inner cavity of the valve body 1. The partition 4 is horizontally positioned and has a valve hole 5. A valve stem 6 extending into the valve body 1 is mounted on the valve body 1, and a valve core 7 is installed inside the valve body 1 to open and close the valve hole 5. This is a conventional valve assembly. The valve core is located inside the inlet channel 2.

[0023] A positioning frame 8 is installed on the valve body 1. A limiting cylinder 9 is provided on the positioning frame 8 for the valve stem to pass through. A stop block 21 is provided at the upper end of the part of the valve stem 6 outside the valve body 1. A compression spring 10 is provided between the stop block 21 and the limiting cylinder 9 and is fitted on the valve stem 6.

[0024] The top of the positioning frame 8 is also equipped with a vertically downward electric cylinder 11, wherein the telescopic end of the electric cylinder 11 is provided with a spline shaft 12, and the valve stem 6 is provided with a cavity 13 for inserting the spline shaft 12, and the valve stem 6 and the spline shaft 12 are fixed together by a pin 14, and both the valve stem 6 and the spline shaft 12 are provided with a through hole 15 through which the pin 14 passes. Normally, the electric cylinder 11 drives the valve stem 6 to rise and fall, thereby causing the valve core 7 to close the valve hole 5. In an emergency, when the electric cylinder 11 is de-energized, the valve stem 6 rises when the shut-off valve is open, and the pressure spring 10 is in a compressed state. The pressure spring 10 in the compressed state exerts a downward pushing force on the stop block 21 and the valve stem 6. In an emergency, the pin 14 can be pulled out, and the pressure spring 10 will elastically recover, causing the valve stem 6 to fall quickly, so that the valve core 7 and the valve hole 5 are tightly closed, thus achieving the function of rapid shut-off. In this way, the shut-off can still be performed quickly even when the power is off.

[0025] The splined shaft and valve stem are fixed by a pin, which facilitates quick disassembly during manual cutting. During installation, an electric cylinder drives the splined shaft to move slowly along the valve stem's insertion cavity, aligning the valve stem 6 with the through hole 15 on the splined shaft 12. Then, the pin is inserted into the through hole to fix it in place. This simple and feasible method is widely used in mechanical manufacturing, and the specific details will not be elaborated further.

[0026] The valve body 1 has an installation port 16, and a valve cover 17 is fixedly attached to the valve body 1 to close the installation port 16. The valve cover 17 has an installation hole 18 for the valve stem 6 to pass through, and a sealing mechanism is also provided on the valve cover 17 to seal the connection between the valve cover 17 and the valve body 1. The flip cover has an installation cavity for installing the sealing mechanism. The sealing structure is composed of multiple sealing gaskets and washers. The innovation of this application is not related to the sealing mechanism, and the sealing mechanism is a structural component of an existing sealing mechanism, the specific structure of which will not be described again. The installation port in this application is larger than the valve core, which facilitates installation. The valve cover 17 and the valve body are fixed with bolts, and a sealing ring is provided at the connection between them for sealing.

[0027] The valve core 7 has an inverted frustum-shaped structure that is narrow at the bottom and wide at the top, and the surface of the valve core 7 is covered with a soft rubber sealing layer 19; the inner contour of the valve hole 5 is adapted to the valve core 7, and the inner wall of the valve hole 5 is provided with a rubber buffer sealing layer 20, thus ensuring a good mating seal between the valve core 7 and the valve hole 5.

[0028] The valve body 1, the partition 4, and the valve core are all made of high-strength materials, making them less prone to damage.

[0029] The valve stem 6 and valve core 7 are provided with a buffer anti-collision mechanism. The buffer anti-collision mechanism includes a vertically upward telescopic rod 23 set on the back side of the valve core 7, and the inner end of the valve stem 6 is provided with a telescopic cavity for the telescopic rod 23 to be inserted and extended. The valve stem 6 is provided with a limiting block 22, and a buffer spring 24 is installed between the limiting block 22 and the back side of the valve core 7. The buffer anti-collision mechanism between the valve stem 6 and valve core 7 ensures that when the compression spring 10 drives the valve stem 6 to descend rapidly, the valve core 7 and valve hole 5 are in elastic contact, thus avoiding severe instantaneous impact force and easy deformation. The elastic deformation of the buffer spring 24 is used to absorb the instantaneous impact force. The spring stiffness of the buffer spring is smaller than that of the compression spring, thus having a better buffering effect.

[0030] During operation, this type of emergency shut-off gas valve normally operates by raising and lowering the valve stem 6 via the electric cylinder 11, which in turn drives the valve core 7 to close the valve orifice 5. In an emergency, when the electric cylinder 11 is de-energized, the valve stem 6 rises when the shut-off valve is open, and the pressure spring 10 is in a compressed state. The pressure spring 10 exerts a downward pushing force on the stop block 21 and the valve stem 6. In an emergency, the pin 14 can be pulled out, causing the pressure spring 10 to elastically recover, which in turn drives the valve stem 6 to descend rapidly, causing the valve core 7 to tightly close the valve orifice 5, thus achieving rapid shut-off. This allows for rapid shut-off even when power is off.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas valve capable of emergency shut-off, comprising a valve body (1), wherein the valve body (1) is provided with an inlet channel (2) and an outlet channel (3), and the inner cavity of the valve body (1) is provided with a partition (4) separating the inlet channel (2) and the outlet channel (3), wherein the partition (4) is horizontally arranged, and the partition (4) is provided with a valve hole (5), and a valve stem (6) extending into the valve body (1) is installed on the valve body (1), wherein the valve stem (6) extends into the valve body (1) and is provided with a valve core (7) for opening and closing the valve hole (5), characterized in that; A positioning frame (8) is installed on the valve body (1). The positioning frame (8) is provided with a limiting cylinder (9) for the valve stem to pass through. A stop block (21) is provided at the upper end of the part of the valve stem (6) outside the valve body (1). A compression spring (10) fitted on the valve stem (6) is provided between the stop block (21) and the limiting cylinder (9). The top of the positioning frame (8) is also equipped with a vertically downward electric cylinder (11), wherein the telescopic end of the electric cylinder (11) is provided with a spline shaft (12), and the valve stem (6) is provided with a cavity (13) for the spline shaft (12) to be inserted, and the valve stem (6) and the spline shaft (12) are fixed by a pin (14), and both the valve stem (6) and the spline shaft (12) are provided with a through hole (15) through which the pin (14) passes.

2. An emergency shut-off gas valve according to claim 1, wherein, The valve body (1) is provided with an installation port (16), and a valve cover (17) is fixed on the valve body (1) to close the installation port (16). The valve cover (17) is provided with an installation hole (18) for the valve stem (6) to pass through. The valve cover (17) is also provided with a sealing mechanism for sealing the connection between the valve cover (17) and the valve body (1).

3. An emergency shut-off gas valve according to claim 1, wherein, The valve core (7) has an inverted frustum-shaped structure that is narrow at the bottom and wide at the top, and the surface of the valve core (7) has a soft rubber sealing layer (19); the inner contour of the valve hole (5) is adapted to the valve core (7), and the inner wall of the valve hole (5) is provided with a rubber buffer sealing layer (20).

4. An emergency shut-off gas valve according to claim 2, wherein, The valve body (1), partition (4) and valve core are all made of high-strength material.

5. The emergency shut-off gas valve of claim 1, wherein, A buffer anti-collision mechanism is provided between the valve stem (6) and the valve core (7). The buffer anti-collision mechanism includes a vertically upward telescopic rod (23) provided on the back side of the valve core (7). The inner end of the valve stem (6) is provided with a telescopic cavity for the telescopic rod (23) to be inserted and telescopically extended. A limiting block (22) is provided on the valve stem (6). A buffer spring (24) is installed between the limiting block (22) and the back side of the valve core (7).

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