Anti-backfire water seal safety device

Abstract

According to the anti-backfire water seal safety device, a pressure relief safety valve, a rupture disk, a check valve mechanism, a water seal and an accident cut-off valve are combined into a whole, the pressure relief safety valve and the rupture disk are provided with a high gear pressure relief pressure and a low gear pressure relief pressure, and on the premise that pressure relief safety is met, the design pressure of the rupture disk is improved, and the maintenance amount formed by breaking of the rupture disk is reduced. The check valve mechanism is arranged below the liquid level of the water seal, the good check sealing effect of the check valve mechanism and the water seal is fully played, and backfire is prevented. In addition, when tempering and detonation are carried out, and the pressure reaches the designed pressure of the rupture disk, the rupture disk is broken, gas impacts the anti-explosion recoil plate, the handle is triggered to turn over to enable the accident cut-off valve to be closed emergently, and danger caused by emission of flammable and combustible media is prevented. According to the anti-backfire water seal safety device, the pressure relief safety valve, the rupture disk, the check valve, the water seal and the accident cut-off valve are ingeniously combined into a whole, sealing is reliable, automatic pressure relief and automatic medium cut-off in an accident are achieved, and multiple reliable anti-backfire safety protection is provided for equipment.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to an anti-backfire water seal safety device. Background Art

[0002] When the combustion medium is closed or the combustion medium pressure is reduced, the flow rate is likely to be lower than the flame propagation speed, and flashback is likely to occur, that is, the flame or its root returns to the burner, pipeline, storage tank and other upstream, damaging equipment and even causing an explosion in severe cases.

[0003] The existing anti-flashback technical solutions have the following disadvantages:

[0004] 1. Failure to release pressure in time, causing equipment damage;

[0005] 2. The seal is not tight, resulting in fire barrier failure;

[0006] 3. After the flashback accident occurs, the medium is not cut off in time, causing fire or even explosion.

[0007] Take hydrogen and oxygen as an example. Hydrogen and oxygen are mixed gases with a volume ratio of 2:1 produced by electrolysis of water. They burn quickly and the combustion temperature can reach 2800℃~3200℃. Once tempered, they will explode in the pipeline. The instantaneous high pressure generated by the explosion is very harmful, and the reliability of the anti-flashback device is extremely high. Therefore, it is necessary to develop an anti-flashback water seal safety device to achieve reliable sealing, automatic pressure relief, and automatic medium cut-off in case of accidents, so as to provide multiple reliable anti-flashback safety protection for the equipment. Summary of the invention

[0008] In view of the problems in the related technology, the present invention discloses an anti-backfire water seal safety device, which solves the disadvantages of the existing anti-backfire technical solutions in the background technology, such as failure to timely relieve pressure, poor sealing, and failure to cut off the medium in time.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An anti-backfire water seal safety device, comprising an emergency cut-off valve, an inlet pipe, a water seal cylinder, and a bursting disc, characterized in that: the lower end of the emergency cut-off valve is connected to the lower end of the water seal cylinder through the inlet pipe, a check valve mechanism is arranged at the center of the lower end of the water seal cylinder, a manual ball valve is arranged on one side of the lower end of the water seal cylinder, a bursting disc is arranged at the top connection of the water seal cylinder, and the bursting disc is compressed and sealed by a butt-welded flange and a gasket; a pressure relief safety valve is arranged at the outlet of the water seal cylinder, and water is injected into the water seal cylinder;

[0011] A bursting recoil plate is provided on the top of the bursting disc, and the bursting recoil plate is triggerably connected to the emergency cut-off valve through a handle.

[0012] As a further solution of the present invention: the emergency shut-off valve is cut off by a bursting disc, a bursting recoil plate installed at the tail of the handle on the emergency shut-off valve is concentric with the bursting disc, and the bursting disc is no higher than the butt-welded flange by no more than 10 mm.

[0013] As a further solution of the present invention: a valve seat is provided at the center of the lower end of the valve body shell of the emergency shut-off valve, the valve stem is inserted from the center of the top of the valve body shell, a valve core is provided at the bottom of the valve stem, and a reset spring is provided between the valve core and the valve body shell; the pin shaft passes through the pin shaft hole on the handle and is connected at the top of the valve stem; when the emergency shut-off valve is in an open state, the reset spring is in a compressed state, and the gap between the valve seat and the valve core is d1; the contact surface between the handle and the valve body shell is the bottom surface, the left end surface of the handle is the left end surface, the distance between the center of the pin shaft hole and the bottom surface is d2, and the distance between the center of the pin shaft hole and the left end surface is d3.

[0014] As a further solution of the present invention: the check valve mechanism is concentric with the water seal cylinder, the base of the check valve mechanism is installed on the connecting flange at the bottom center of the water seal cylinder, a sealing gasket is fitted on the upper sealing surface of the base, a guide sleeve is provided under the sealing gasket, a protective sleeve is provided on the outer side of the sealing gasket, and a locking bolt passes through the central through holes of the guide sleeve, the sealing gasket and the protective sleeve from bottom to top in sequence, and is tightened into an integral valve disc with a locking nut.

[0015] As a further solution of the present invention: the guide sleeve is inserted into the base, the guide sleeve includes three evenly distributed guide posts and a center hole, the guide posts are inscribed in a circle with an outer diameter of d, and d is 2 mm smaller than the inner diameter of the base.

[0016] As a further solution of the present invention: a counterweight is provided on the integral valve disc of the check valve mechanism, a locking bolt and a locking nut pass through the center of the counterweight, and an outer arc diameter of the counterweight is 2 mm smaller than the inner diameter of the water seal cylinder.

[0017] As a further solution of the present invention: the bottom of the handle is provided with a smooth rounded corner tangent to the bottom surface, and the difference between the distance d2 between the center of the pin shaft hole and the bottom surface and the distance d3 between the left end surface is greater than the gap d1 between the valve seat and the valve core, and less than the compression deformation of the reset spring.

[0018] As a further solution of the present invention: a visible window is provided at the lower end of the water seal cylinder at a height of 300 mm from the center of the inlet pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A pressure relief safety valve is installed at the outlet of the water seal cylinder, and a bursting disc is installed at its upper end. Two-level relief pressure is set. When the equipment flashback and deflagration pressure is low, the pressure relief safety valve is triggered to release and reduce the pressure. When the equipment flashback and deflagration pressure is high, the pressure relief safety valve releases and the bursting disc breaks at the same time to achieve rapid pressure relief. The high and low two-level relief pressure design can effectively protect the equipment while increasing the bursting pressure of the bursting disc, reducing the impact of the bursting disc breakage on the operation of the equipment and reducing the maintenance.

[0021] 2. The guide sleeve is inserted into the base, and the three evenly distributed guide posts of the guide sleeve are inscribed in a circle with an outer diameter d of the center hole, and d is 2mm smaller than the inner diameter of the base. The three evenly distributed guide posts on the guide sleeve restrict the check valve mechanism from moving up and down in the base. When the medium overcomes the resistance and pushes the check valve mechanism open, the medium passes through the gap between the guide posts to prevent the guide sleeve from being separated from the base due to pressure buildup.

[0022] 3. A counterweight is set on the overall valve disc of the check valve mechanism. The locking bolt and the locking nut pass through the center hole of the counterweight, and the outer arc diameter of the counterweight is 2mm smaller than the inner diameter of the water seal cylinder. The outer arc diameter of the counterweight is 2mm smaller than the inner diameter of the water seal cylinder. The counterweight limits the up and down movement of the check valve mechanism and prevents it from being deflected and stuck. A certain amount of water is injected into the anti-flashback water seal safety device. The check valve mechanism is below the liquid level. Since the counterweight is set on the check valve mechanism, the check valve opening pressure can be adjusted by the weight of the counterweight, without simply increasing the liquid level to form a potential difference, thereby reducing the water seal level and the size of the water seal cylinder. The check valve mechanism is below the liquid level, and the sealing gasket and the valve seat form an effective sealing surface, which prevents flashback while preventing the high pressure generated by flashback from causing water to flow back; in addition, the water seal has good sealing performance and can reduce the flame temperature, so that the flame cannot burn upstream; the combination of the two has a good sealing and anti-flashback effect. As the medium will take away some water when it passes through, a window is set at the lower end of the water seal cylinder at a height of 300mm from the center of the inlet pipe. When the liquid level is insufficient, water is replenished in time through a manual ball valve.

[0023] 4. The emergency cut-off valve is triggered by the bursting disc. The bursting recoil plate installed at the tail of the handle on the emergency cut-off valve is concentric with the bursting disc, and the bursting disc is no higher than the butt-welded flange by no more than 10mm. The benefit of this solution is that the bursting recoil plate obtains sufficient triggering force. When the medium backfires and deflagration high pressure exceeds the bursting pressure, even if the bursting disc is slightly broken, it can generate sufficient triggering force.

[0024] 5. The smooth rounded corner of the handle is tangent to the bottom surface, and the difference between the distance d2 between the center of the pin hole and the bottom surface and the distance d3 from the left end surface is greater than the gap between the valve seat and the valve core, and less than the compression deformation of the reset spring. The smooth rounded corner of the handle is tangent to the bottom surface, which has the benefit of reducing the resistance to the handle flipping. The difference between the distance d2 between the center of the pin hole and the bottom surface and the distance d3 from the left end surface is greater than the gap between the valve seat and the valve core, and less than the compression deformation of the reset spring. When the backfire triggers the bursting disc to release pressure, the instantaneous air pressure pushes the bursting recoil plate, causing the handle to flip, the reset spring to reset, and the valve core to press against the valve seat, quickly cutting off the medium, thereby preventing fire and further accidents.

[0025] In short, this new anti-backfire water seal safety device solves the shortcomings of existing anti-backfire technical solutions such as inability to relieve pressure in time, poor sealing, and failure to cut off the medium in time. It has reliable sealing, automatic pressure relief, and automatic medium cut-off in the event of an accident, providing multiple reliable anti-backfire safety protections for the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] In the attached picture:

[0028] Figure 1 The present invention is a schematic structural diagram of an anti-backfire water seal safety device.

[0029] 1. Emergency shut-off valve; 2. Inlet pipe; 3. Lock bolt; 4. Lock nut; 5. Washer; 6. Protective cover; 7. Sealing pad; 8. Guide sleeve; 9. Base; 10. Counterweight; 11. Window; 12. Water seal cylinder; 13. Safety valve; 14. Bursting disc; 15. Butt welding flange; 16. Manual ball valve;

[0030] Figure 2 The present invention is a schematic structural diagram of an emergency cut-off valve of an anti-backfire water seal safety device.

[0031] 101, handle; 102, return spring; 103, valve core; 104, valve seat; 105, pin shaft; 106, valve stem; 107, valve body shell;

[0032] Figure 3 The present invention is a schematic structural diagram of an emergency cut-off valve handle of an anti-backfire water seal safety device.

[0033] 201, bottom surface; 202, left end surface; 203, blasting recoil plate; 204, pin hole

[0034] Figure 4 The present invention is a schematic structural diagram of an emergency shut-off valve check valve mechanism of an anti-backfire water seal safety device.

[0035] 4. Locking nut; 5. Washer; 6. Protective cover; 7. Sealing pad; 8. Guide sleeve; 9. Base; 10. Counterweight; 12. Water seal cylinder;

[0036] Figure 5 The present invention is a schematic structural diagram of a guide sleeve of an emergency cut-off valve of an anti-backfire water seal safety device.

[0037] 301, center hole; 302 guide column;

[0038] Figure 6 The present invention is a schematic diagram of the top view of the structure of an emergency cut-off valve guide sleeve of an anti-backfire water seal safety device.

[0039] 301, center hole; 302 guide column; DETAILED DESCRIPTION

[0040] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0041] like Figure 1-6 As shown:

[0042] The anti-backfire water seal safety device includes an accident cut-off valve 1, an inlet pipe 2, a water seal cylinder 12, and a bursting disc 14. Its main features are that the lower end of the accident cut-off valve 1 is connected to the lower end of the water seal cylinder 12 through the inlet pipe 2, a check valve mechanism is arranged at the center of the lower end of the water seal cylinder 12, a manual ball valve 16 is arranged next to it, a bursting disc 14 is arranged at the top connection of the water seal cylinder 12, and it is tightly sealed by a butt-welded flange 15 and a gasket; a pressure relief safety valve 13 is arranged at the outlet of the water seal cylinder 12. A certain amount of water is injected into the anti-backfire water seal safety device, and a viewing window 11 is arranged at the lower end of the water seal cylinder 12 at a height of 300mm from the center of the inlet pipe 2.

[0043] The check valve mechanism is concentric with the water seal cylinder 12. The base 9 of the check valve mechanism is installed on the connecting flange at the bottom center of the water seal cylinder 12. The sealing gasket 7 is in contact with the sealing surface of the base 9. A guide sleeve 8 is provided below the sealing gasket 7 and a protective sleeve 6 is provided above the sealing gasket 7. The locking bolt 3 passes through the central through holes of the guide sleeve 8, the sealing gasket 7 and the protective sleeve 6 from bottom to top in sequence and is tightened into an integral valve disc with a locking nut 4.

[0044] The valve seat 104 is arranged at the center of the lower end of the valve body shell 107 of the emergency cut-off valve 1, the valve stem 106 is inserted from the center of the top of the valve body shell 107, the valve core 103 is arranged at the bottom of the valve stem 106, and a return spring 102 is arranged between the valve core 103 and the valve body shell 107; the pin 105 passes through the pin hole 204 on the handle 101 and is connected at the top of the valve stem 106. When the emergency cut-off valve 1 is in the open state, the return spring 102 is in the compressed state, and the gap between the valve seat 104 and the valve core 103 is d1; the contact surface between the handle 101 and the valve body shell 107 is the bottom surface 201, the left end surface of the handle is the left end surface 202, and the distance between the center of the pin hole 204 and the bottom surface 201 is d2 and the distance between the left end surface 202 is d3.

[0045] The guide sleeve 8 is inserted into the base 9 , and three evenly distributed guide posts 302 of the guide sleeve 8 are inscribed in a circle with an outer diameter d of the center hole 301 , and d is 2 mm smaller than the inner diameter of the base 9 .

[0046] A counterweight block 10 is arranged on the integral valve disc of the check valve mechanism, and the locking bolt 3 and the locking nut 4 pass through the central hole of the counterweight block 10 , and the outer arc diameter of the counterweight block 10 is 2 mm smaller than the inner diameter of the water seal cylinder 12 .

[0047] The emergency shut-off valve 1 is cut off by a bursting disc 14 , and the bursting recoil plate 203 installed at the tail of the handle 101 on the emergency shut-off valve 1 is concentric with the bursting disc 14 , and the bursting disc 14 is not more than 10 mm higher than the butt-welding flange 15 .

[0048] The smooth rounded corner of the handle 101 is tangent to the bottom surface 201 , and the difference between the distance d2 between the center of the pin hole and the bottom surface 201 and the distance d3 between the left end surface 202 is greater than the gap d1 between the valve seat 104 and the valve core 103 , and less than the compression deformation of the return spring 102 .

[0049] The blasting recoil plate 113 installed at the tail of the handle 101 is concentric with the butt-welded flange 15. The fillet at the lower left corner of the handle 101 is tangent to the bottom surface, and the difference between the center of the pin hole 204 and the bottom surface and the left end surface is greater than the gap d1 between the valve seat 112 and the valve core 109, and less than the compression deformation of the reset spring 108.

[0050] In practical application:

[0051] A pressure relief safety valve 13 is provided at the outlet of the water seal cylinder 12, and a bursting disc 14 is provided at the upper end thereof. Two-stage relief pressure is set, high and low. When the equipment flashback and deflagration pressure is low, the pressure relief safety valve 13 is triggered to release and reduce the pressure. When the equipment flashback and deflagration pressure is high, the pressure relief safety valve releases and the bursting disc 14 breaks to achieve rapid pressure relief. The high and low two-stage relief pressure design can effectively protect the equipment while increasing the bursting pressure of the bursting disc 14, reducing the impact of the bursting disc breakage on the operation of the equipment and reducing the maintenance.

[0052] The guide sleeve 8 is inserted into the base 9, and the three evenly distributed guide posts 302 of the guide sleeve 8 are inscribed in a circle with an outer diameter d of the center hole 30), and d is 2 mm smaller than the inner diameter of the base 9. The three evenly distributed guide posts 302 on the guide sleeve 8 restrict the check valve mechanism from moving up and down in the base 9. When the medium overcomes the resistance and pushes the check valve mechanism open, the medium passes through the gap of the guide posts 302 to prevent the guide sleeve 8 from being separated from the base 9 due to pressure buildup.

[0053] A counterweight 10 is provided on the integral valve disc of the check valve mechanism, and the locking bolt 3 and the locking nut 4 pass through the central hole of the counterweight 10, and the outer arc diameter of the counterweight 10 is 2 mm smaller than the inner diameter of the water seal cylinder 12. The outer arc diameter of the counterweight 10 is 2 mm smaller than the inner diameter of the water seal cylinder 12, and the counterweight 10 limits the up and down movement of the check valve mechanism and prevents its deflection from causing jamming. A certain amount of water is injected into the anti-backfire water seal safety device, and the check valve mechanism is below the liquid level. Since the counterweight 10 is provided on the check valve mechanism, the check valve opening pressure can be adjusted by the weight of the counterweight 10, without simply increasing the liquid level to form a potential difference, thereby reducing the water seal liquid level and the size of the water seal cylinder 12. The check valve mechanism is below the liquid level, and the sealing gasket 7 and the base 9 form an effective sealing surface, which prevents backfire while preventing the high pressure generated by the backfire from causing the water to flow back; in addition, the water seal has good sealing performance and can reduce the flame temperature at the same time, so that the flame cannot burn upstream; the combination of the two has a good sealing and anti-backfire effect. Since the medium will take away some water when it passes through, a window 11 is set at the lower end of the water seal cylinder 12 at a height of 300 mm from the center of the inlet pipe 2. When the liquid level is insufficient, water is replenished in time through the manual ball valve 16.

[0054] The emergency cut-off valve 1 is cut off by the bursting disc 14. The bursting recoil plate 203 installed at the tail of the handle 101 on the emergency cut-off valve 1 is concentric with the bursting disc 14, and the bursting disc 14 is no higher than the butt-welded flange 15 by no more than 10 mm. The benefit of this solution is that the bursting recoil plate 203 obtains sufficient triggering force. When the medium backfires and deflagration high pressure exceeds the bursting pressure, even if the bursting disc 14 is slightly broken, it can generate sufficient triggering force.

[0055] The smooth rounded corner of the handle 101 is tangent to the bottom surface 201, and the difference between the distance d2 between the center of the pin hole and the bottom surface 201 and the distance d3 between the left end surface 202 is greater than the gap d1 between the valve seat 104 and the valve core 103, and less than the compression deformation of the reset spring 102. The smooth rounded corner of the handle 101 is tangent to the bottom surface 201, which has the benefit of reducing the flipping resistance of the handle 101. The difference between the distance d2 between the center of the pin hole and the bottom surface 201 and the distance d3 between the left end surface 202 is greater than the gap d1 between the valve seat 104 and the valve core 103, and less than the compression deformation of the reset spring 102. When the backfire triggers the bursting disc to release pressure, the instantaneous air pressure pushes the bursting recoil plate, causing the handle to flip, the reset spring to reset, and the valve core 103 to press the valve seat 104, quickly cutting off the medium, thereby preventing fire and further accidents.

[0056] In summary, an anti-backfire water seal safety device solves the shortcomings of existing anti-backfire technical solutions such as inability to unload pressure in time, poor sealing, and failure to cut off the medium in time. It has reliable sealing, automatic pressure relief, and automatic medium cutting off in case of accidents, providing multiple reliable anti-backfire safety protections for the equipment.

[0057] Finally, it should be noted that the above disclosure is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The scope of this application is limited only by the attached claims.

Claims

1. A backfire prevention water seal safety device, comprising an emergency cut-off valve (1), an inlet pipe (2), a water seal cylinder (12), and a bursting disc (14), characterized in that: The lower end of the emergency shut-off valve (1) is connected to the lower end of the water seal cylinder (12) through an inlet pipe (2); a check valve mechanism is provided at the center of the lower end of the water seal cylinder (12); a manual ball valve (16) is provided on one side of the lower end of the water seal cylinder (12); a bursting disc (14) is provided at the top connection of the water seal cylinder (12); the bursting disc (14) is compressed and sealed by a butt-welded flange (15) and a gasket; a pressure relief safety valve (13) is provided at the outlet of the water seal cylinder (12); and water is injected into the water seal cylinder (12); A bursting recoil plate (203) is provided on the top of the bursting disc (14), and the bursting recoil plate (203) is triggerably connected to the emergency shut-off valve (1) via a handle (101).

2. The anti-backfire water seal safety device according to claim 1, characterized in that: The emergency shut-off valve (1) is shut off by a bursting disc (14), the bursting recoil plate (203) installed at the tail of the handle (101) on the emergency shut-off valve (1) is concentric with the bursting disc (14), and the bursting disc (14) is not higher than the butt-welded flange (15) by more than 10 mm.

3. The anti-backfire water seal safety device according to claim 1, characterized in that: The emergency shut-off valve (1) has a valve seat (104) at the center of the lower end of the valve body shell (107); a valve stem (106) is inserted from the center of the top of the valve body shell (107); a valve core (103) is provided at the bottom of the valve stem (106); a return spring (102) is provided between the valve core (103) and the valve body shell (107); a pin shaft (105) passes through a pin shaft hole (204) on the handle (101) and is connected to the top of the valve stem (106); Therefore, when the shut-off valve (1) is in an open state, the return spring (102) is in a compressed state, and the gap between the valve seat (104) and the valve core (103) is d1; the contact surface between the handle (101) and the valve body housing (107) is the bottom surface (201), the left end surface of the handle (101) is the left end surface (202), the distance between the center of the pin shaft hole (204) and the bottom surface (201) is d2, and the distance between the center of the pin shaft hole (204) and the left end surface (202) is d3.

4. The anti-backfire water seal safety device according to claim 1, characterized in that: The check valve mechanism is concentric with the water seal cylinder (12), and the base (9) of the check valve mechanism is installed on the connecting flange at the bottom center of the water seal cylinder (12). A sealing gasket (7) is provided on the upper sealing surface of the base (9), a guide sleeve (8) is provided below the sealing gasket (7), and a protective sleeve (6) is provided outside the sealing gasket (7). The locking bolt (3) passes through the central through hole of the guide sleeve (8), the sealing gasket (7), and the protective sleeve (6) from bottom to top in sequence, and is tightened into an integral valve disc by a locking nut (4).

5. The anti-backfire water seal safety device according to claim 4, characterized in that: The guide sleeve (8) is inserted into the base (9), and the guide sleeve (8) comprises three evenly distributed guide posts (302) and a center hole (301). The guide posts (302) are inscribed in a circle with an outer diameter d, and d is 2 mm smaller than the inner diameter of the base (9).

6. The anti-backfire water seal safety device according to claim 4, characterized in that: A counterweight (10) is arranged on the integral valve disc of the check valve mechanism, a locking bolt (3) and a locking nut (4) pass through the center of the counterweight (10), and the outer arc diameter of the counterweight (10) is 2 mm smaller than the inner diameter of the water seal cylinder (12).

7. The anti-backfire water seal safety device according to claim 3, characterized in that: The bottom of the handle (101) is provided with a smooth rounded corner tangent to the bottom surface (201), and the difference between the distance d2 between the center of the pin shaft hole (204) and the bottom surface (201) and the distance d3 from the left end surface (202) is greater than the gap d1 between the valve seat (104) and the valve core (103), and is less than the compression deformation of the return spring (102).

8. The anti-backfire water seal safety device according to claim 1, characterized in that: A visible window (11) is provided at the lower end of the water seal cylinder (12) at a height of 300 mm from the center of the inlet pipe (2).

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