Pressure vacuum valve for exhaust pipe opening of gasoline tank of gasoline station

Abstract

The utility model relates to the technical field of gas station equipment, and aims to solve the technical problem of high fire risk. In order to solve the technical problem, the utility model provides the pressure vacuum valve for the exhaust pipe opening of the gasoline tank of the gasoline station. A main valve body is provided with a first channel and a second channel which are communicated with each other, and a communicating hole is formed in the connecting position of the second channel and the first channel; the positive pressure valve abuts against the top of the communicating hole. The fire extinguishing valve assembly comprises a fire extinguishing valve seat, a fire extinguishing valve rod and a fire extinguishing valve body; the fire extinguishing valve seat is connected to the top end of the main valve body; a third channel communicated with the outside is arranged in the fire extinguishing valve seat; the fire extinguishing valve rod is connected with the fire extinguishing valve seat; the fire extinguishing valve body is slidably connected to the top of the fire extinguishing valve rod. The thermosensitive assembly is connected between the top cover and the fire extinguishing valve body; in a use state, the third channel is communicated with the outside; in the fire extinguishing state, the thermosensitive assembly is burnt out, and the third channel is not communicated with the outside. The automatic fire extinguishing device can automatically extinguish fire.

Description

Technical Field

[0001] This utility model relates to the field of gas station equipment technology, and in particular to a pressure vacuum valve for the exhaust pipe port of gasoline tanks in gas stations. Background Technology

[0002] Pressure vacuum valves are required to be installed on the vent pipes of underground gasoline tanks at gas stations. These valves serve to reduce emissions, block rainwater, dust, insects, and provide fire and explosion protection. However, due to environmental factors such as lightning strikes, in extreme situations, these pressure vacuum valves may ignite, posing a serious safety hazard to the gas station and surrounding area. In the event of a disaster, the pressure vacuum valves will continue to burn as gasoline fumes are released. Currently, these valves lack active fire extinguishing capabilities and require either natural fire suppression or manual intervention to extinguish the fire, thus posing a significant risk. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station, comprising:

[0005] The main valve body has a first channel and a second channel that are interconnected. The second channel is located at the top of the first channel and has a larger diameter than the first channel. The connection between the second channel and the first channel is a connecting hole.

[0006] A positive pressure valve is abutted against the top of the connecting hole; the positive pressure valve moves up and down in the second channel, and there is a gap between the positive pressure valve and the inner wall of the main valve body;

[0007] The fire extinguishing valve assembly has a service state and a fire extinguishing state; the fire extinguishing valve assembly includes a fire extinguishing valve seat, a fire extinguishing valve stem, and a fire extinguishing valve body; the fire extinguishing valve seat is connected to the top of the main valve body; the fire extinguishing valve seat has a third channel communicating with the outside; the fire extinguishing valve stem is located in the third channel and is connected to the fire extinguishing valve seat; the fire extinguishing valve body is slidably connected to the top of the fire extinguishing valve stem.

[0008] Top cover, connected above the fire extinguishing valve assembly;

[0009] A heat-sensitive component is connected between the top cover and the fire extinguishing valve body;

[0010] Specifically: In the operating state, the third channel is connected to the outside; in the fire extinguishing state, the heat-sensitive component is burned out, and the fire extinguishing valve body moves axially, so that the third channel is not connected to the outside.

[0011] In one embodiment of this utility model, the fire extinguishing valve stem includes a valve stem body and a valve stem; the valve stem body is connected to the fire extinguishing valve seat; the valve stem is connected to the center of the valve stem body by a plurality of connecting members spaced apart along the axial direction; the valve stem is provided with a mounting hole; the fire extinguishing valve body is provided with a guide rod, the guide rod is slidably connected to the mounting hole, and an elastic member is connected between the fire extinguishing valve body and the fire extinguishing valve stem.

[0012] In one embodiment of this utility model, the guide rod includes a rod portion and a head connected to the top of the rod portion, the head being connected to the upper surface of the fire extinguishing valve body; the rod portion passes through the fire extinguishing valve body and is slidably connected to the fire extinguishing valve stem.

[0013] In one embodiment of this utility model, the inner wall of the fire extinguishing valve seat is provided with a groove; in the fire extinguishing state, the outer wall of the fire extinguishing valve body is sealed to the groove.

[0014] In one embodiment of this utility model, the heat-sensitive component is a fusible head, which includes a fusible head body and a fusible head support connected to the top of the fusible head body. The bottom of the fusible head body is connected to the valve body of the fire extinguishing valve, and the fusible head support is connected to the top cover.

[0015] In one embodiment of the present invention, the main valve body includes a first valve body and a second valve body connected to the top of the first valve body, a first channel is disposed in the first valve body, and a second channel is disposed in the second valve body.

[0016] In one embodiment of this utility model, the application further includes a lower flame arrestor mesh, which is connected between the main valve body and the flange, and the bottom of the lower flame arrestor mesh extends into the flange.

[0017] In one embodiment of this utility model, the application further includes a guide seat connected to the main valve body; a positive pressure valve is sleeved in the guide seat and moves up and down in the guide seat; at least one opening is provided on the side wall of the guide seat.

[0018] In one embodiment of this utility model, this application also includes an upper flame arrestor mesh; the upper flame arrestor mesh is vertically sleeved between the main valve body and the positive pressure valve.

[0019] In one embodiment of this utility model, the application further includes a flange, which is sealed to the bottom of the main valve body.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The pressure vacuum valve for the exhaust pipe of a gasoline tank at a gas station, as described in this utility model, uses a heat-sensitive component that breaks upon heating, causing the valve body of the fire extinguishing valve to move and seal against the valve seat. This closes the gas path connecting the third channel to the outside, effectively cutting off flammable materials for fire extinguishing. This embodiment employs a purely mechanical structure to achieve automatic fire extinguishing, reducing fire hazards, preventing the spread of fire damage, and avoiding significant economic losses and personal injury accidents. It also improves the safety of gas stations, enhances the safety credibility of enterprises, and provides a guarantee for the normal operation of gas stations. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0023] Figure 1 This is a three-dimensional schematic diagram of a pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station, according to a preferred embodiment of the present invention.

[0024] Figure 2 yes Figure 1 A schematic diagram of the internal structure of a pressure vacuum valve used at the exhaust port of a gasoline tank at a gas station;

[0025] Figure 3 yes Figure 1 Front view of a pressure vacuum valve used for the exhaust pipe of gasoline tanks at gas stations;

[0026] Figure 4 yes Figure 3 A sectional view;

[0027] Explanation of reference numerals in the accompanying drawings: 100, main valve body; 110, first channel; 120, second channel; 130, connecting hole; 140, first valve body; 150, second valve body;

[0028] 200. Positive pressure valve; 210. Positive pressure valve seat;

[0029] 300. Fire extinguishing valve assembly; 310. Fire extinguishing valve seat; 311. Third channel; 312. Slot; 320. Fire extinguishing valve stem; 321. Stem body; 322. Stem; 323. Connector; 324. Mounting hole; 325. Elastic element; 330. Fire extinguishing valve body; 331. Guide rod; 332. Sealing groove;

[0030] 400. Top cover; 410. Top cover support column;

[0031] 500. Thermistor component; 510. Fusible link body; 520. Fusible link support base;

[0032] 600, Flange;

[0033] 700. Lower fire barrier net;

[0034] 800, guide seat; 810, opening;

[0035] 900. Install fire-resistant mesh. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0037] Reference Figures 1-4 As shown, this utility model embodiment provides a pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station, comprising:

[0038] The main valve body 100 has a first channel 110 and a second channel 120 that are interconnected. The second channel 120 is located at the top of the first channel 110 and the diameter of the second channel 120 is larger than the diameter of the first channel 110. The connection between the second channel 120 and the first channel 110 is a connecting hole 130.

[0039] A positive pressure valve 200 is abutted against the top of the connecting hole 130; the positive pressure valve 200 moves up and down in the second channel 120, and there is a gap between the positive pressure valve 200 and the inner wall of the main valve body 100.

[0040] The fire extinguishing valve assembly 300 has a working state and a fire extinguishing state. The fire extinguishing valve assembly 300 includes a fire extinguishing valve seat 310, a fire extinguishing valve stem 320, and a fire extinguishing valve body 330. The fire extinguishing valve seat 310 is connected to the top of the main valve body 100. In some embodiments, the fire extinguishing valve seat 310 and the main valve body 100 are threadedly connected. The fire extinguishing valve seat 310 has a third channel 311 communicating with the outside. The fire extinguishing valve stem 320 is disposed in the third channel 311 and is connected to the fire extinguishing valve seat 310. The fire extinguishing valve body 330 is slidably connected to the top of the fire extinguishing valve stem 320.

[0041] A top cover 400 is connected above the fire extinguishing valve assembly 300; in some embodiments, the top cover 400 is bolted to the top of the fire extinguishing valve seat 310. In some possible embodiments, this application also includes a plurality of circumferentially spaced top cover support columns 410. The top cover 400 is fixed to the top of the fire extinguishing valve seat 310 by the plurality of top cover support columns 410. The bottom end of the top cover support column 410 is bolted to the fire extinguishing valve seat 310. The top end of the top cover support column 410 is threaded to the top cover 400.

[0042] The thermal component 500 is connected between the top cover 400 and the fire extinguishing valve body 330. In use, the thermal component 500 presses down on the fire extinguishing valve body 330, so that the third channel 311 can be unblocked from the outside.

[0043] Specifically: In the operating state, the third channel 311 is connected to the outside; in the fire extinguishing state, the heat-sensitive component 500 is burned off, and the fire extinguishing valve body 330 moves axially, so that the third channel 311 is not connected to the outside.

[0044] This device is installed at the top of the exhaust pipe of the gasoline tank at the gas station. When the gas pressure in the tank rises to the valve opening pressure specified by the national standard, the positive pressure valve 200 moves upward under the action of the gas pressure, opening the valve and connecting the first channel 110 and the second channel 120.

[0045] In operation: With the support of the thermal component 500, the fire extinguishing valve body 330 is separated from the fire extinguishing valve seat 310, thus keeping the air passage connecting the third channel 311 to the outside unobstructed. At this time, the oil and gas discharged through the positive pressure valve 200 can be normally discharged to the outside through the first channel 110, the second channel 120, and the third channel 311.

[0046] In the fire-extinguishing state, if a thunderstorm occurs during the discharge of oil and gas, the exhaust pipe may be affected by lightning, generating a discharge spark that could ignite the discharged oil and gas, causing a fire. Once ignited, the heat generated by the flames will come into contact with the heat-sensitive component 500, causing it to melt and break within a short time. This causes the fire extinguishing valve body 330 to lose its support, and the valve body 330 will rapidly move upward until its outer wall tightly seals against the inner wall of the valve seat 310. Ultimately, this cuts off the connection between the third channel 311 and the outside, stopping the discharge of oil and gas, extinguishing the flames, and thus achieving the fire extinguishing function.

[0047] Therefore, this embodiment utilizes the thermal component 500 to fracture upon heating, causing the fire extinguishing valve body 330 to move and seal against the fire extinguishing valve seat 310. This closes the gas path connecting the third channel 311 to the outside, effectively cutting off combustible materials for fire extinguishing. This embodiment employs a purely mechanical structure to achieve automatic fire extinguishing, reducing fire hazards, preventing the spread of fire damage, and avoiding significant economic losses and personal injury accidents. It also improves the safety of gas stations, enhances the safety credibility of enterprises, and provides a guarantee for the normal operation of gas stations.

[0048] Further, the fire extinguishing valve stem 320 includes a stem body 321 and a stem 322; the stem body 321 is connected to the fire extinguishing valve seat 310; in some embodiments, the stem body 321 is an annular structure, and the stem body 321 is threadedly connected to the fire extinguishing valve seat 310. The stem 322 is connected to the center of the stem body 321 by a plurality of connecting members 323 spaced apart along the axial direction; the stem 322 is provided with a mounting hole 324; the fire extinguishing valve body 330 is provided with a guide rod 331, the guide rod 331 is slidably connected to the mounting hole 324, and an elastic element 325 (e.g., a spring) is connected between the fire extinguishing valve body 330 and the fire extinguishing valve stem 320. In some embodiments, the outer wall of the stem 322 is provided with a step, the bottom end of the elastic element 325 is connected to the step, and the top end of the elastic element 325 is connected to or in contact with the bottom of the fire extinguishing valve body 330. In the use state, the elastic element 325 is in a compressed state.

[0049] Specifically, in this embodiment, the valve stem body 321 is connected to the fire extinguishing valve seat 310, and the perforation between multiple connecting parts 323 enables the connection between the third channel 311 and the second channel 120. Therefore, this embodiment has a simple structure and a stable and reliable connection. Furthermore, the guide rod 331, in conjunction with the mounting hole 324, guides the movement of the fire extinguishing valve body 330, thereby ensuring that the fire extinguishing valve body 330 can seal with the fire extinguishing valve seat 310 after moving upwards.

[0050] Furthermore, the guide rod 331 includes a rod portion and a head connected to the top of the rod portion, the head being connected to the upper surface of the fire extinguishing valve body 330; the rod portion passes through the fire extinguishing valve body 330 and is slidably connected to the fire extinguishing valve stem 320.

[0051] Furthermore, the inner wall of the fire extinguishing valve seat 310 is provided with a groove 312; in the fire extinguishing state, the outer wall of the fire extinguishing valve body 330 is sealed to the groove 312 by a sealing ring. In some embodiments, the outer wall of the fire extinguishing valve body 330 is provided with a sealing groove 332, and a sealing ring is installed in the sealing groove 332. Specifically, in this embodiment, after the fire extinguishing valve body 330 rises, it is engaged in the groove 312 and sealed, thereby blocking the third channel 311, disconnecting the third channel 311 from the outside, and thus extinguishing the fire.

[0052] Furthermore, the heat-sensitive component 500 is a fusible head, which includes a fusible head body 510 and a fusible head support 520 connected to the top of the fusible head body 510. The bottom of the fusible head body 510 is connected to the guide rod 331 of the fire extinguishing valve body 330, and the fusible head support 520 is connected to the top cover 400. In some embodiments, the fusible head support 520 is threadedly connected to the top cover 400.

[0053] Specifically, in use, the bottom of the fusible head body 510 presses against the fire extinguishing valve body 330, and the top of the fusible head body 510 presses against the lower surface of the fusible head support 520. The fusible head body 510 is essentially wedged between the fire extinguishing valve body 330 and the fusible head support 520, ensuring unobstructed airflow in the third channel 311. In the event of a fire, the fusible head body 510 will melt rapidly, causing the fire extinguishing valve body 330 to lose its support and move upwards, disconnecting the third channel 311 from the outside environment. This embodiment has a simple structure and low cost.

[0054] Further, the main valve body 100 includes a first valve body 140 and a second valve body 150 connected to the top of the first valve body 140. In some embodiments, the first valve body 140 and the second valve body 150 are connected by bolts. A first channel 110 is disposed in the first valve body 140, and a second channel 120 is disposed in the second valve body 150. In some embodiments, this application also includes a positive pressure valve seat 210, which has an annular structure. The bottom of the second valve body 150 is provided with a mounting groove, and the positive pressure valve seat 210 is disposed in the mounting groove. The positive pressure valve 200 is placed on top of the positive pressure valve seat 210. In some embodiments, the positive pressure valve seat 210 can be connected to the second valve body 150 by turning or casting.

[0055] Specifically, in this embodiment, the main valve body 100 is designed as a split structure to facilitate the installation of other internal components.

[0056] Furthermore, this application also includes a flange 600, which is sealed to the bottom of the main valve body 100. Specifically, the flange 600 is threaded to the bottom of the main valve body 100 and then sealed by a sealing ring. This embodiment includes a flange 600 to facilitate installation of this application at the top of the exhaust pipe of a gasoline tank at a gas station.

[0057] Furthermore, this application also includes a lower flame arrestor 700, which is connected between the main valve body 100 and the flange 600, with the bottom of the lower flame arrestor 700 extending into the flange 600. In some embodiments, the lower flame arrestor 700 includes a flame arrestor body and a flange connected to the top of the flame arrestor body. The flange is engaged between the upper end face of the flange 600 and the lower end face of the main valve body 100, and the flame arrestor body extends into the inner hole of the flange 600. Specifically, the lower flame arrestor 700 provided in this embodiment serves as heat insulation.

[0058] Furthermore, this application also includes a guide seat 800 connected to the main valve body 100; a positive pressure valve 200 is sleeved in the guide seat 800, and the positive pressure valve 200 moves up and down within the guide seat 800; at least one opening 810 is provided on the side wall of the guide seat 800. The opening 810 increases the area of ​​communication between the first channel 110 and the second channel 120. In some embodiments, a slot is formed at the connection position of the first valve body 140 and the second valve body 150, and the bottom of the guide seat 800 is engaged in the slot. In this way, when connecting the first valve body 140 and the second valve body 150, the guide seat 800 can be connected and fixed to the main valve body 100, making assembly simple and convenient. Specifically, in this embodiment, the guide seat 800 enhances the guiding function for the up and down movement of the positive pressure valve 200.

[0059] Furthermore, this application also includes an upper flame arrestor 900; the upper flame arrestor 900 is vertically sleeved between the main valve body 100 and the positive pressure valve 200. In some embodiments, the upper flame arrestor 900 is fixedly connected to the main valve body 100. When this application includes a guide seat 800 and a positive pressure valve seat 210, the upper flame arrestor 900 is sleeved on the outside of the guide seat 800, and the upper flame arrestor 900 abuts against the top of the positive pressure valve seat 210. Specifically, the upper flame arrestor 900 provided in this embodiment serves to filter and isolate external insects and impurities, as well as to disperse heat.

[0060] This application relates to a pressure vacuum valve for the exhaust pipe of gasoline tanks at gas stations. It features an automatic fire extinguishing function; in the event of a fire, it automatically activates the fire extinguishing mechanism to stop the fire. Therefore, this application demonstrates automatic fire detection and the ability to automatically extinguish a fire within seconds of its occurrence, preventing the fire from spreading from the exhaust pipe.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station, characterized in that: include: The main valve body has a first channel and a second channel that are interconnected. The second channel is located at the top of the first channel and has a diameter larger than that of the first channel. The connection between the second channel and the first channel is a connecting hole. A positive pressure valve is abutted against the top of the connecting hole; the positive pressure valve moves up and down in the second channel, and there is a gap between the positive pressure valve and the inner wall of the main valve body; A fire extinguishing valve assembly has a working state and a fire extinguishing state; the fire extinguishing valve assembly includes a fire extinguishing valve seat, a fire extinguishing valve stem, and a fire extinguishing valve body; the fire extinguishing valve seat is connected to the top of the main valve body; the fire extinguishing valve seat has a third channel communicating with the second channel; the fire extinguishing valve stem is disposed in the third channel and is connected to the fire extinguishing valve seat; the fire extinguishing valve body is slidably connected to the top of the fire extinguishing valve stem; Top cover, connected above the fire extinguishing valve assembly; A heat-sensitive component is connected between the top cover and the fire extinguishing valve body; Wherein: in the operating state, the third channel is connected to the outside; in the fire extinguishing state, the heat-sensitive component is burned out, and the fire extinguishing valve body moves axially, thereby cutting off the connection between the third channel and the outside.

2. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: The fire extinguishing valve stem includes a valve stem body and a valve stem; the valve stem body is connected to the fire extinguishing valve seat; the valve stem is connected to the center of the valve stem body by a plurality of connecting pieces spaced apart along the axial direction; the valve stem has a mounting hole; the fire extinguishing valve body has a guide rod, the guide rod is slidably connected to the mounting hole, and an elastic element is connected between the fire extinguishing valve body and the fire extinguishing valve stem.

3. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 2, characterized in that: The guide rod includes a rod portion and a head connected to the top of the rod portion, the head being connected to the upper surface of the fire extinguishing valve body; the rod portion passes through the fire extinguishing valve body and is slidably connected to the fire extinguishing valve stem.

4. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 3, characterized in that: The inner wall of the fire extinguishing valve seat is provided with a groove; in the fire extinguishing state, the outer wall of the fire extinguishing valve body is sealed to the groove.

5. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: The heat-sensitive component is a fusible head, which includes a fusible head body and a fusible head support connected to the top of the fusible head body. The bottom of the fusible head body is connected to the fire extinguishing valve body, and the fusible head support is connected to the top cover.

6. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: The main valve body includes a first valve body and a second valve body connected to the top of the first valve body. The first channel is located in the first valve body, and the second channel is located in the second valve body.

7. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: It also includes a flange, which is sealed to the bottom of the main valve body.

8. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 7, characterized in that: It also includes a lower flame arrestor mesh, which is connected between the main valve body and the flange, and the bottom of the lower flame arrestor mesh extends into the flange.

9. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: It also includes a guide seat connected to the main valve body; the positive pressure valve is sleeved in the guide seat and moves up and down in the guide seat; at least one opening is provided on the side wall of the guide seat.

10. The pressure vacuum valve for the exhaust pipe port of a gasoline tank at a gas station according to claim 1, characterized in that: It also includes an upper flame arrestor mesh; the upper flame arrestor mesh is vertically sleeved between the main valve body and the positive pressure valve.

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