Natural gas valve well lid explosion-proof device

Abstract

The utility model provides a natural gas valve well lid explosion-proof device, which belongs to the technical field of well lids and comprises an energy absorption plate and a plurality of energy absorption hydraulic cylinders. The energy absorption plate is arranged on the supporting step and arranged in the natural gas valve well in a sliding mode. The multiple energy absorption hydraulic cylinders are located above the energy absorption plate and arranged in the circumferential direction of the energy absorption plate at intervals. A piston rod of each energy absorption hydraulic cylinder faces the energy absorption plate, and a sliding space is formed between the piston rod of each energy absorption hydraulic cylinder and the energy absorption plate; wherein the energy absorption hydraulic cylinder is fixed on the inner circumferential wall of the natural gas valve well; a pressure relief channel is formed in the position, in the sliding space, of the interior of the natural gas valve well, extends upwards and communicates with the top of the natural gas valve well; a sealing cover is arranged on the top of the pressure relief channel. Through the arrangement, energy generated by explosion can be absorbed, then the impact of explosion on the well lid is reduced, and therefore the situation that the well lid flies out can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of manhole covers, and in particular relates to an explosion-proof device for a natural gas valve manhole cover. Background Art

[0002] Most of the natural gas transportation pipelines are buried underground. In order to facilitate the regulation of natural gas, valve wells are usually set up, and valves are set at the location of the valve wells. During operation, natural gas will escape at the valve location and gather in the valve well; it is easy to explode when encountering open flames, so the well cover will fly out, posing a safety hazard. Utility Model Content

[0003] The embodiment of the utility model provides an explosion-proof device for a natural gas valve manhole cover, aiming to solve the technical problem in the prior art that the manhole cover is easy to fly out during an explosion.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] Provided is a natural gas valve well cover explosion-proof device, which is arranged in a natural gas valve well, and a supporting step is arranged in the natural gas valve well, comprising:

[0006] An energy absorbing plate is arranged on the supporting step and is slidably arranged in the natural gas valve well;

[0007] A plurality of energy absorbing hydraulic cylinders are located above the energy absorbing plate and are spaced apart along the circumference of the energy absorbing plate; the piston rod of each energy absorbing hydraulic cylinder faces the energy absorbing plate, and there is a sliding space between the piston rod of the energy absorbing hydraulic cylinder and the energy absorbing plate;

[0008] Among them, the energy-absorbing hydraulic cylinder is fixed on the inner circumferential wall of the natural gas valve well; the interior of the natural gas valve well is provided with a pressure relief channel at the position of the sliding space, the pressure relief channel extends upward and is connected with the top of the natural gas valve well; the top of the pressure relief channel is provided with a sealing cover.

[0009] In a possible implementation, a rope is connected to the cover, and the other end of the rope is connected to the ground.

[0010] In one possible implementation, an alarm light is provided on the top of the natural gas valve well, and the explosion-proof device also includes a battery box, wherein opposite ends of the battery box respectively have a positive pole and a negative pole, and the battery box is used to install dry batteries; an insulating sheet is provided between the dry batteries and the positive pole, and one end of the insulating sheet extends out of the battery box and is connected to the sealing cover; the battery box is fixed on the ground.

[0011] In a possible implementation, an inner peripheral wall of the natural gas valve well is provided with a mounting groove corresponding to the energy-absorbing hydraulic cylinder one by one, and the energy-absorbing hydraulic cylinder is fixed in the mounting groove.

[0012] In a possible implementation, the liquid in each of the energy-absorbing hydraulic cylinders is water, and a one-way valve is provided at a discharge port near the bottom of the cylinder barrel of the energy-absorbing hydraulic cylinder;

[0013] Wherein, the one-way valve opens at a preset pressure to discharge the water in the energy-absorbing hydraulic cylinder.

[0014] In a possible implementation, the energy absorbing plate has an entrance and exit in the middle, and a sealing plate is provided at the entrance and exit of the energy absorbing plate, and the sealing plate is detachably connected to the energy absorbing plate.

[0015] In a possible implementation, the outer peripheral wall of the sealing plate has an external thread, the inlet and outlet have an internal thread, and the sealing plate and the energy absorbing plate are threadedly matched;

[0016] Wherein, when the sealing plate and the energy absorbing plate are connected in place, the top of the sealing plate is coplanar with the top of the energy absorbing plate.

[0017] In a possible implementation, the top of the sealing plate has a groove, and a handle is hinged in the groove.

[0018] In a possible implementation, the bottom of the energy absorbing plate has a counterweight ring, and the counterweight ring is coaxially arranged with the inlet and outlet.

[0019] The utility model provides a natural gas valve manhole cover explosion-proof device. Compared with the prior art, when an explosion occurs in the natural gas valve well, the energy absorbing plate slides upward under the action of the impact force; when the energy absorbing plate contacts the piston rod of the energy absorbing hydraulic cylinder, the energy absorbing plate provides upward pressure on the piston rod, and the piston rod retracts into the hydraulic cylinder, thereby playing a role of energy absorption and reducing the impact of the explosion on the manhole cover; when the energy absorbing plate moves to the top of the pressure relief channel, the explosion area is connected to the outside through the pressure relief channel, thereby playing a role of pressure relief and further reducing the impact on the manhole cover; through the above-mentioned arrangement of the present application, the energy generated by the explosion can be absorbed, thereby reducing the impact of the explosion on the manhole cover, thereby reducing the situation where the manhole cover flies out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a natural gas valve manhole cover explosion-proof device provided by an embodiment of the utility model;

[0021] Figure 2 A cross-sectional view of a natural gas valve manhole cover explosion-proof device provided in an embodiment of the utility model;

[0022] Figure 3 for Figure 2 The enlarged schematic diagram of the middle A part;

[0023] Figure 4 A schematic diagram of a sealing plate portion of a natural gas valve manhole cover explosion-proof device provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of a pressure relief channel portion of a natural gas valve manhole cover explosion-proof device provided in an embodiment of the utility model.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Natural gas valve well; 11. Support step; 12. Pressure relief channel; 13. Cover; 14. Mounting groove; 2. Energy absorbing plate; 21. Inlet and outlet; 22. Cover plate; 23. Groove; 24. Handle; 25. Counterweight ring; 3. Energy absorbing hydraulic cylinder; 31. One-way valve. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Please also read Figures 1 to 5 , now a natural gas valve manhole cover explosion-proof device provided by the utility model is described. The natural gas valve manhole cover explosion-proof device is arranged in a natural gas valve well 1, and a support step 11 is provided in the natural gas valve well 1, including an energy absorption plate 2 and a plurality of energy absorption hydraulic cylinders 3; the energy absorption plate 2 is arranged on the support step 11, and is slidably arranged in the natural gas valve well 1; a plurality of energy absorption hydraulic cylinders 3 are located above the energy absorption plate 2, and are arranged at intervals along the circumference of the energy absorption plate 2; the piston rod of each energy absorption hydraulic cylinder 3 faces the energy absorption plate 2, and there is a sliding space between the piston rod of the energy absorption hydraulic cylinder 3 and the energy absorption plate 2; wherein the energy absorption hydraulic cylinder 3 is fixed on the inner circumferential wall of the natural gas valve well 1; the interior of the natural gas valve well 1 is provided with a pressure relief channel 12 at the position of the sliding space, the pressure relief channel 12 extends upward, and is connected with the top of the natural gas valve well 1; the top of the pressure relief channel 12 is provided with a sealing cover 13. There are air holes on the manhole cover.

[0028] The utility model provides a natural gas valve manhole cover explosion-proof device. Compared with the prior art, when an explosion occurs in the natural gas valve well 1, the energy absorbing plate 2 slides upward under the action of the impact force; when the energy absorbing plate 2 contacts the piston rod of the energy absorbing hydraulic cylinder 3, the energy absorbing plate 2 provides upward pressure on the piston rod, and the piston rod retracts into the hydraulic cylinder, thereby playing a role of energy absorption and reducing the impact of the explosion on the manhole cover; when the energy absorbing plate 2 moves to the top of the pressure relief channel 12, the explosion area is connected to the outside through the pressure relief channel 12, thereby playing a role of pressure relief and further reducing the impact on the manhole cover; through the above-mentioned arrangement of the present application, the energy generated by the explosion can be absorbed, thereby reducing the impact of the explosion on the manhole cover, thereby reducing the situation where the manhole cover flies out.

[0029] In some embodiments, Figures 1 to 5 As shown, a rope is connected to the cover 13, and the other end of the rope is connected to the ground; an alarm light is arranged on the top of the natural gas valve well 1, and the explosion-proof device also includes a battery box, and the opposite ends of the battery box have a positive pole and a negative pole respectively, and the battery box is used to install dry batteries; an insulating sheet is provided between the dry battery and the positive pole, and one end of the insulating sheet extends out of the battery box and is connected to the cover 13; the battery box is fixed on the ground.

[0030] It should be noted that the other end of the rope is fixed to the ground by an anchor bolt; the rope is connected to the cover 13, which can limit the cover 13 and reduce the loss of the cover 13 when the cover 13 flies out under the impact. When there is no explosion, the cover 13 covers the top of the pressure relief channel 12, which can reduce the entry of debris into the pressure relief channel 12.

[0031] Exemplarily, the battery box and the alarm light are both fixed on the ground, the battery box is made of waterproof material, and has a through hole for the insulating sheet to extend out, and a rubber strip is connected to the through hole of the battery box, and the rubber strip is pressed against the insulating sheet to reduce the water entering the battery box from the through hole. When the cover 13 flies out, the insulating sheet can be pulled out of the battery box, at which time the positive pole of the dry cell is connected to the positive pole of the battery box, and the negative pole of the dry cell is connected to the negative pole of the battery box, and the alarm sounds an alarm, which can serve as a reminder.

[0032] In some embodiments, Figures 1 to 5 As shown, the inner peripheral wall of the natural gas valve well 1 has mounting grooves 14 corresponding to the energy-absorbing hydraulic cylinders 3, and the energy-absorbing hydraulic cylinders 3 are fixed in the mounting grooves 14. The liquid in each energy-absorbing hydraulic cylinder 3 is water, and the cylinder barrel of the energy-absorbing hydraulic cylinder 3 has a one-way valve 31 near the bottom of the cylinder. The one-way valve 31 opens at a preset pressure to discharge the water in the energy-absorbing hydraulic cylinder 3.

[0033] It should be noted that fixing the energy-absorbing hydraulic cylinder 3 in the mounting groove 14 can axially limit the energy-absorbing hydraulic cylinder 3; when the energy-absorbing plate 2 pushes the piston rod, the one-way valve 31 on the energy-absorbing hydraulic cylinder 3 is in a conducting state under a preset pressure, at which time the water in the energy-absorbing hydraulic cylinder 3 can be discharged, and during the movement of the piston rod, the energy of the energy-absorbing plate 2 can be absorbed, thereby reducing the impact energy of the energy-absorbing plate 2.

[0034] In some embodiments, Figures 1 to 5 As shown, the energy absorbing plate 2 has an inlet and outlet 21 in the middle, and a sealing plate 22 is provided at the inlet and outlet 21 of the energy absorbing plate 2, and the sealing plate 22 is detachably connected to the energy absorbing plate 2. The sealing plate 22 has an external thread on its outer peripheral wall, and an internal thread on the inlet and outlet 21, and the sealing plate 22 is threadedly matched with the energy absorbing plate 2; wherein, when the sealing plate 22 is connected to the energy absorbing plate 2 in place, the top of the sealing plate 22 is coplanar with the top of the energy absorbing plate 2.

[0035] It should be noted that when maintenance is required, the operator stands on the energy absorbing plate 2 and then rotates the sealing plate 22 to remove the sealing plate 22 from the energy absorbing plate 2, and then the operator enters from the inlet and outlet 21 to the bottom to perform maintenance on the natural gas transportation pipeline valve. After the maintenance is completed, the sealing plate 22 is rotated to the position of the inlet and outlet 21.

[0036] In some embodiments, Figures 1 to 5 As shown, the top of the sealing plate 22 is provided with a groove 23 , and a handle 24 is hinged in the groove 23 ; the bottom of the energy absorbing plate 2 is provided with a counterweight ring 25 , and the counterweight ring 25 is coaxially arranged with the inlet and outlet 21 .

[0037] It should be noted that when the sealing plate 22 needs to be rotated, the handle 24 is unscrewed from the groove 23, and then the sealing plate 22 is rotated by holding the handle 24, so that the sealing plate 22 can be removed from the energy absorbing plate 2, or the sealing plate 22 can be installed on the energy absorbing plate 2. By providing a counterweight ring 25 at the bottom of the energy absorbing plate 2, the weight of the energy absorbing plate 2 can be increased, so that more energy can be absorbed and the impact force can be weakened.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural gas valve well cover explosion-proof device, arranged in a natural gas valve well, wherein a supporting step is provided in the natural gas valve well, characterized in that: include: An energy absorbing plate is arranged on the supporting step and is slidably arranged in the natural gas valve well; A plurality of energy absorbing hydraulic cylinders are located above the energy absorbing plate and are spaced apart along the circumference of the energy absorbing plate; the piston rod of each energy absorbing hydraulic cylinder faces the energy absorbing plate, and there is a sliding space between the piston rod of the energy absorbing hydraulic cylinder and the energy absorbing plate; Among them, the energy-absorbing hydraulic cylinder is fixed on the inner circumferential wall of the natural gas valve well; the interior of the natural gas valve well is provided with a pressure relief channel at the position of the sliding space, the pressure relief channel extends upward and is connected with the top of the natural gas valve well; the top of the pressure relief channel is provided with a sealing cover.

2. A natural gas valve manhole cover explosion-proof device as claimed in claim 1, characterized in that: The cover is connected with a rope, and the other end of the rope is connected to the ground.

3. A natural gas valve manhole cover explosion-proof device as claimed in claim 2, characterized in that: An alarm light is provided on the top of the natural gas valve well. The explosion-proof device also includes a battery box. The opposite ends of the battery box have a positive pole and a negative pole respectively. The battery box is used to install dry batteries. An insulating sheet is provided between the dry batteries and the positive pole. One end of the insulating sheet extends out of the battery box and is connected to the sealing cover. The battery box is fixed on the ground.

4. The explosion-proof device for a natural gas valve manhole cover according to claim 1, characterized in that: The inner peripheral wall of the natural gas valve well is provided with mounting grooves corresponding to the energy-absorbing hydraulic cylinders one by one, and the energy-absorbing hydraulic cylinders are fixed in the mounting grooves.

5. A natural gas valve manhole cover explosion-proof device as claimed in claim 1 or 4, characterized in that: The liquid in each of the energy-absorbing hydraulic cylinders is water, and a one-way valve is provided at a discharge port near the bottom of the cylinder barrel of the energy-absorbing hydraulic cylinder; Wherein, the one-way valve opens at a preset pressure to discharge the water in the energy-absorbing hydraulic cylinder.

6. The explosion-proof device for a natural gas valve manhole cover according to claim 1, characterized in that: The energy absorbing plate has an entrance and exit in the middle, and a sealing plate is provided at the entrance and exit of the energy absorbing plate, and the sealing plate is detachably connected to the energy absorbing plate.

7. A natural gas valve manhole cover explosion-proof device as claimed in claim 6, characterized in that: The outer peripheral wall of the sealing plate is provided with an external thread, the inlet and outlet are provided with an internal thread, and the sealing plate and the energy absorbing plate are threadedly matched; Wherein, when the sealing plate and the energy absorbing plate are connected in place, the top of the sealing plate is coplanar with the top of the energy absorbing plate.

8. The explosion-proof device for a natural gas valve manhole cover according to claim 7, characterized in that: The top of the sealing plate is provided with a groove, and a handle is hinged in the groove.

9. The explosion-proof device for a natural gas valve manhole cover according to claim 6, characterized in that: The bottom of the energy absorbing plate is provided with a counterweight ring, and the counterweight ring is coaxially arranged with the inlet and outlet.

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