Exhaust device for natural gas valve well

Abstract

The utility model provides an exhaust device for a natural gas valve well, which belongs to the technical field of natural gas valve wells and comprises a first air inducing pipeline and a second air inducing pipeline. The first air inducing pipeline is connected into the natural gas valve well; the bottom end of the first air inducing pipeline is close to the bottom of the natural gas valve well, and the top end of the first air inducing pipeline is bent and communicates with the ventilation hole of the annular boss; the second air inducing pipeline is connected into the natural gas valve well; the top end of the second air inducing pipeline is bent and penetrates out of the peripheral wall of the annular boss; the penetrating-out end of the second air inducing pipeline is used for being connected with an induced draft fan. A non-return structure is arranged at the ventilation hole of the annular boss, and when rainwater overflows the ventilation hole, the non-return structure is used for blocking the ventilation hole. And after circulation is conducted for preset time, fuel gas accumulated in the natural gas valve well can be reduced, and therefore potential safety hazards can be reduced during overhauling.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas valve wells, and in particular relates to an exhaust device used for a natural gas valve well. Background Art

[0002] The function of the natural gas valve well is to control the start and stop of the natural gas pipeline so that it can be maintained more effectively. Since the valve well is equipped with a natural gas transmission pipeline, maintenance personnel are required to regularly go underground for maintenance in order to ensure safe use. A manhole cover is installed on the top of the natural gas valve well. The flowability between the inside and outside of the natural gas valve well is poor, and harmful gases are easily accumulated, which is prone to safety hazards when maintenance personnel are performing maintenance. Utility Model Content

[0003] The embodiment of the utility model provides an exhaust device for a natural gas valve well, aiming to solve the technical problem in the prior art that the natural gas valve well is prone to accumulate harmful gases and is prone to potential safety hazards during maintenance.

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

[0005] Provided is an exhaust device for a natural gas valve well, which is arranged in the natural gas valve well. The opening position of the natural gas valve well has an annular boss, a well cover is arranged on the top of the annular boss, and a plurality of vents are arranged on the outer peripheral wall of the annular boss. The exhaust device comprises:

[0006] A first air duct is connected to the natural gas valve well; the bottom end of the first air duct is close to the bottom of the natural gas valve well, and the top end of the first air duct is bent and connected to the ventilation hole of the annular boss;

[0007] A second induced air duct is connected to the natural gas valve well; the top end of the second induced air duct is bent and passes through the outer peripheral wall of the annular boss; the passing end of the second induced air duct is used to connect to the induced draft fan;

[0008] Wherein, a non-return structure is provided at the ventilation hole of the annular boss, and when rainwater overflows the ventilation hole, the non-return structure is used to block the ventilation hole.

[0009] In a possible implementation, the outer side wall of the annular boss is connected to a curved pipe at the position of the ventilation hole, and the opening of the curved pipe is arranged downward; the anti-return structure includes:

[0010] A sealing plate, one side of which is hinged at the opening of the elbow; the angle between the sealing plate and the opening end of the elbow is an acute angle;

[0011] A floating body connected to a side of the sealing plate away from the elbow opening;

[0012] When the liquid surface of rainwater contacts the floating body, the floating body can rotate around the hinge axis and finally close the open end of the bent pipe.

[0013] In a possible implementation, a sealing gasket is connected to the sealing plate, and when the sealing plate contacts the open end of the bent pipe, the sealing gasket can seal the open end of the bent pipe.

[0014] In one possible implementation, the bent pipe has a supporting rod, one end of which is connected to the bent pipe, and the other end of which is bent and contacts the side of the sealing plate away from the bent pipe, so that an acute angle is formed between the sealing plate and the bent pipe.

[0015] In one possible implementation, a threaded hole is provided on the bent pipe, and the supporting rod has a plurality of through holes aligned with the threaded holes; when the supporting rod is placed in a preset position, the through holes on the supporting rod are aligned with the threaded holes on the bent pipe, and the supporting rod and the bent pipe are fixed by bolts.

[0016] In a possible implementation, filter cotton is provided in the bent pipe, and the filter cotton is detachably connected to the bent pipe.

[0017] In a possible implementation, a first mounting ring is provided in the bent pipe near the opening end, the first mounting ring has an arc-shaped groove, one end of the arc-shaped groove has an insertion hole, and the length of the insertion hole is greater than the width of the arc-shaped groove;

[0018] The filter cotton is provided with a second mounting ring, and the second mounting ring is provided with a T-shaped protrusion; the T-shaped protrusion can be plugged and matched with the plug hole.

[0019] In a possible implementation, a one-way valve is connected to the outlet end of the second air duct, and the conducting direction of the one-way valve is from the inside of the second air duct to the outside of the second air duct.

[0020] In a possible implementation, the outer peripheral wall of the outlet end of the second air duct has an external thread, and the exhaust device further includes a cover body that matches the thread of the outlet end of the second air duct.

[0021] The utility model provides an exhaust device for a natural gas valve well. Compared with the prior art, when the natural gas valve well needs to be inspected and repaired, the air inlet of the induced draft fan is connected to the outlet end of the second induced draft duct, and then the induced draft fan is started, so that the air in the natural gas valve well can be extracted, and at the same time, the external air enters the natural gas valve well from the first induced draft duct; after circulating for a preset time, the gas accumulated in the natural gas valve well can be reduced, so that the safety hazard can be reduced during inspection and repair; by arranging a non-return structure at the ventilation hole position of the annular boss, when rainwater overflows the ventilation hole position, the non-return structure can close the ventilation hole, thereby reducing the rainwater entering the first induced draft duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of an exhaust device for a natural gas valve well provided in an embodiment of the utility model;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part;

[0024] Figure 3 A cross-sectional view of an exhaust device for a natural gas valve well provided in an embodiment of the utility model;

[0025] Figure 4 for Figure 3 The enlarged schematic diagram of the middle B part;

[0026] Figure 5 A schematic diagram of a supporting rod portion of an exhaust device for a natural gas valve well provided by an embodiment of the utility model;

[0027] Figure 6 for Figure 5 Enlarged schematic diagram of part C in the middle.

[0028] Explanation of the reference numerals in the accompanying drawings: 1. natural gas valve well; 2. annular boss; 3. first induced air duct; 4. second induced air duct; 5. non-return structure; 51. elbow; 511. threaded hole; 512. bolt; 52. sealing plate; 53. float; 54. supporting rod; 55. filter cotton; 56. first mounting ring; 561. arc groove; 562. socket; 57. second mounting ring; 58. T-shaped protrusion. DETAILED DESCRIPTION

[0029] 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.

[0030] Please also read Figures 1 to 6, now an exhaust device for a natural gas valve well provided by the utility model is described. The exhaust device for a natural gas valve well is arranged in a natural gas valve well 1, and the opening position of the natural gas valve well 1 is provided with an annular boss 2, and a well cover (not shown in the figure) is arranged on the top of the annular boss 2, and a plurality of vents are arranged on the outer peripheral wall of the annular boss 2; the exhaust device comprises a first induced air duct 3 and a second induced air duct 4; the first induced air duct 3 is connected in the natural gas valve well 1; the bottom end of the first induced air duct 3 is close to the bottom of the natural gas valve well 1, and the top end of the first induced air duct 3 is bent and connected with the vent of the annular boss 2; the second induced air duct 4 is connected in the natural gas valve well 1; the top end of the second induced air duct 4 is bent and passes through the outer peripheral wall of the annular boss 2; the passing end of the second induced air duct 4 is used to connect an induced draft fan (not shown in the figure); wherein, a non-return structure 5 is arranged at the vent of the annular boss 2, and when rainwater overflows the vent, the non-return structure 5 is used to block the vent. The natural gas valve well 1 in the present application is not arranged on the road, so it will not hinder the vehicles on the road. There is a gap between the bottom of the first induced air duct 3 and the bottom of the second induced air duct 4 and the bottom of the natural gas valve well 1.

[0031] The utility model provides an exhaust device for a natural gas valve well 1. Compared with the prior art, when the natural gas valve well 1 needs to be repaired, the air inlet of the induced draft fan is connected to the outlet end of the second induced draft duct 4, and then the induced draft fan is started, so that the air in the natural gas valve well 1 can be extracted, and at the same time, the external air enters the natural gas valve well 1 from the first induced draft duct 3; after circulating for a preset time, the gas accumulated in the natural gas valve well 1 can be reduced, so that the safety hazard can be reduced during maintenance; by arranging a non-return structure 5 at the ventilation hole position of the annular boss 2, when rainwater overflows the ventilation hole position, the non-return structure 5 can close the ventilation hole, thereby reducing the rainwater entering the first induced draft duct 3.

[0032] In some embodiments, Figures 1 to 6 As shown, the outer wall of the annular boss 2 is connected to a curved pipe 51 at the position of the ventilation hole, and the opening of the curved pipe 51 is set downward; the non-return structure 5 includes a sealing plate 52 and a float 53; one side of the sealing plate 52 is hinged at the opening position of the curved pipe 51; the angle between the sealing plate 52 and the opening end of the curved pipe 51 is an acute angle; the float 53 is connected to the side of the sealing plate 52 away from the opening of the curved pipe 51; wherein, when the liquid surface of rainwater contacts the float 53, the float 53 can rotate around the hinge axis and finally close the opening end of the curved pipe 51.

[0033] It should be noted that when rainwater comes into contact with the float 53 and gradually rises, the float 53 can drive the sealing plate 52 to rotate around the hinge position under the action of the buoyancy of water, and finally close the opening position of the curved pipe 51, thereby reducing the situation where rainwater enters the curved pipe 51.

[0034] Exemplarily, since the included angle between the sealing plate 52 and the curved pipe 51 is an acute angle, the sealing plate 52 can close the opening position of the curved pipe 51 in time under the buoyancy of the floating body 53 .

[0035] In some embodiments, Figures 1 to 6 As shown, a sealing gasket is connected to the sealing plate 52 , and when the sealing plate 52 contacts the open end of the curved pipe 51 , the sealing gasket can seal the open end of the curved pipe 51 .

[0036] It should be noted that, by providing a sealing gasket on the sealing plate 52 , the sealing effect of the sealing plate 52 can be improved, and the rainwater entering the curved pipe 51 can be reduced.

[0037] In some embodiments, Figures 1 to 6 As shown, the curved pipe 51 has a supporting rod 54, one end of which is connected to the curved pipe 51, and the other end of which is bent and contacts the side of the sealing plate 52 away from the curved pipe 51, so that an acute angle is formed between the sealing plate 52 and the curved pipe 51.

[0038] It should be noted that by providing a supporting rod 54 on the curved pipe 51 and the bottom end of the supporting rod 54 is bent, the lowest position of the sealing plate 52 can be supported, so that an acute angle is formed between the sealing plate 52 and the curved pipe 51 .

[0039] In some embodiments, Figures 1 to 6 As shown, a threaded hole 511 is provided on the bent pipe 51, and a plurality of through holes aligned with the threaded hole 511 are provided on the supporting rod 54; when the supporting rod 54 is placed in a preset position, the through holes on the supporting rod 54 are aligned with the threaded holes 511 on the bent pipe 51, and the supporting rod 54 and the bent pipe 51 are fixed by bolts 512.

[0040] It should be noted that the supporting rod 54 is connected to different threaded holes 511 of the bent pipe 51 through bolts 512 , which can change the supporting position of the supporting rod 54 on the sealing plate 52 , thereby facilitating the adjustment of the opening size of the sealing plate 52 .

[0041] In some embodiments, Figures 1 to 6 As shown, the curved pipe 51 has filter cotton 55 inside, and the filter cotton 55 is detachably connected to the curved pipe 51; the curved pipe 51 has a first mounting ring 56 near the open end, and the first mounting ring 56 has an arc groove 561, and one end of the arc groove 561 has a socket 562, and the length of the socket 562 is greater than the width of the arc groove 561; the filter cotton 55 has a second mounting ring 57, and the second mounting ring 57 has a T-shaped protrusion 58; the T-shaped protrusion 58 can be plugged into and matched with the socket 562.

[0042] It should be noted that, when the T-shaped protrusion 58 on the second mounting ring 57 is inserted from the socket 562, the T-shaped protrusion 58 is located at the top of the first mounting ring 56; by rotating the second mounting ring 57, the T-shaped protrusion 58 can be rotated to a position misaligned with the socket 562, so that the T-shaped protrusion 58 can be snapped onto the first mounting ring 56. At this time, the second mounting ring 57 can be fixed on the first mounting ring 56.

[0043] In some embodiments, Figures 1 to 6 As shown, a one-way valve is connected to the outlet end of the second air duct 4 , and the conducting direction of the one-way valve is from the inside of the second air duct 4 to the outside of the second air duct 4 .

[0044] It should be noted that, by providing a one-way valve on the second air duct 4 , the gas in the natural gas valve well 1 can be discharged, and external impurities can be restricted from entering the second air duct 4 through the one-way valve.

[0045] In some embodiments, Figures 1 to 6 As shown, the outer peripheral wall of the outlet end of the second air duct 4 has an external thread, and the exhaust device also includes a cover body that is threadedly matched with the outlet end of the second air duct 4.

[0046] It should be noted that, by providing a cover at the outlet end of the second air duct 4 , the outlet end of the second air duct 4 can be blocked when not under maintenance, thereby reducing impurities entering the second air duct 4 .

[0047] 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. An exhaust device for a natural gas valve well, arranged in the natural gas valve well, characterized in that: The opening position of the natural gas valve well is provided with an annular boss, a well cover is arranged on the top of the annular boss, and a plurality of vents are arranged on the outer peripheral wall of the annular boss; the exhaust device comprises: A first air duct is connected to the natural gas valve well; the bottom end of the first air duct is close to the bottom of the natural gas valve well, and the top end of the first air duct is bent and connected to the ventilation hole of the annular boss; A second induced air duct is connected to the natural gas valve well; the top end of the second induced air duct is bent and passes through the outer peripheral wall of the annular boss; the passing end of the second induced air duct is used to connect to the induced draft fan; Wherein, a non-return structure is provided at the ventilation hole of the annular boss, and when rainwater overflows the ventilation hole, the non-return structure is used to block the ventilation hole.

2. The exhaust device for a natural gas valve well according to claim 1, characterized in that: The outer side wall of the annular boss is connected with a curved pipe at the position of the ventilation hole, and the opening of the curved pipe is arranged downward; the anti-return structure includes: A sealing plate, one side of which is hinged at the opening of the elbow; the angle between the sealing plate and the opening end of the elbow is an acute angle; A floating body connected to a side of the sealing plate away from the elbow opening; When the liquid surface of rainwater contacts the floating body, the floating body can rotate around the hinge axis and finally close the open end of the bent pipe.

3. The exhaust device for a natural gas valve well according to claim 2, characterized in that: A sealing gasket is connected to the sealing plate, and when the sealing plate contacts the open end of the bent pipe, the sealing gasket can seal the open end of the bent pipe.

4. The exhaust device for a natural gas valve well according to claim 2, characterized in that: The curved pipe is provided with a supporting rod, one end of which is connected to the curved pipe, and the other end of which is bent and contacts the side of the sealing plate away from the curved pipe, so that an acute angle is formed between the sealing plate and the curved pipe.

5. The exhaust device for a natural gas valve well according to claim 4, characterized in that: The bent pipe is provided with a threaded hole, and the supporting rod has a plurality of through holes aligned with the threaded holes; when the supporting rod is placed in a preset position, the through holes on the supporting rod are aligned with the threaded holes on the bent pipe, and the supporting rod and the bent pipe are fixed by bolts.

6. The exhaust device for a natural gas valve well according to claim 2, characterized in that: The bent pipe is provided with filter cotton, and the filter cotton is detachably connected to the bent pipe.

7. The exhaust device for a natural gas valve well according to claim 6, characterized in that: A first mounting ring is provided in the bent pipe near the opening end, the first mounting ring has an arc-shaped groove, one end of the arc-shaped groove has an insertion hole, and the length of the insertion hole is greater than the width of the arc-shaped groove; The filter cotton is provided with a second mounting ring, and the second mounting ring is provided with a T-shaped protrusion; the T-shaped protrusion can be plugged and matched with the plug hole.

8. The exhaust device for a natural gas valve well according to claim 1, characterized in that: The outlet end of the second air duct is connected with a one-way valve, and the conducting direction of the one-way valve is from the inside of the second air duct to the outside of the second air duct.

9. The exhaust device for a natural gas valve well according to claim 1, characterized in that: The outer peripheral wall of the outlet end of the second air duct has an external thread, and the exhaust device also includes a cover body that is threadedly matched with the outlet end of the second air duct.

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