Dry backfire prevention device for hydrogen-oxygen mixture

Abstract

The utility model discloses a dry-type anti-backfire device for hydrogen-oxygen mixed gas, which relates to the technical field of anti-backfire devices and comprises a shell, a cover body is in threaded connection with the inside of the shell, a fire stopping sheet is placed in the shell, a first sealing ring matched with the fire stopping sheet for use is placed in the shell, and a second sealing ring matched with the fire stopping sheet for use is placed in the shell. The surface of the shell communicates with a sleeve, and the interior of the sleeve is slidably connected with a piston rod. According to the anti-backfire device, the fire stopping sheet is mounted in the shell, so that after the anti-backfire device is mounted at one end, far away from an external pipeline, of a pipeline in equipment through the air inlet connector and the pipeline in the equipment is subjected to backfire, flames can be effectively blocked after passing through the fire stopping sheet, and the flames are prevented from entering the hydrogen-oxygen generator; the anti-backfire device can effectively protect the interior of equipment, and the whole anti-backfire device is simple in structure and small in size, can be installed in the equipment for the last fire prevention work of the equipment, and improves the practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-backfire devices, in particular to a dry-type anti-backfire device for hydrogen-oxygen mixed gas. Background Art

[0002] At present, during the use of hydrogen-oxygen generators, two wet anti-backfire devices are installed on the external transmission pipelines, which can effectively prevent the backfire phenomenon in the external pipelines. However, after long-term use, it was found that the internal pipeline inside the equipment is used to connect the external pipeline. The internal pipeline is directly connected to the equipment. During the use of the internal pipeline, backfire will also occur, causing the flame to enter the interior of the equipment. In order to form a more comprehensive protection for the equipment and prevent the backfire phenomenon inside the equipment, an anti-backfire device must also be installed inside the equipment. However, due to the limited internal space of the equipment, the wet anti-backfire device is not applicable. Therefore, it is necessary to design an anti-backfire device that can be used inside the equipment. Utility Model Content

[0003] The purpose of the present utility model is to provide a dry-type flashback preventer for hydrogen-oxygen mixture to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: it includes a shell, the internal thread of the shell is connected to a cover body, a fire stop plate is placed inside the shell, a first sealing ring used in conjunction with the fire stop plate is placed inside the shell, the surface of the shell is connected to a sleeve, the interior of the sleeve is slidably connected to a piston rod, an exhaust hole is opened inside the piston rod, and a hole groove connected to the exhaust hole is opened on the surface of the piston rod.

[0005] In a further embodiment, a second sealing ring is sleeved on the surface of the cover.

[0006] The above technical solution is adopted to improve the sealing performance between the cover and the shell, thereby preventing gas leakage.

[0007] In a further embodiment, the top of the cover is connected to an air inlet connector.

[0008] The above technical solution is adopted to facilitate the intake and transportation of gas inside the equipment, so that the gas is transported to the external pressure-reducing exhaust pipeline through the backfire preventer.

[0009] In a further embodiment, the bottom of the shell is connected to a gas outlet connector.

[0010] The above technical solution is adopted to facilitate the gas to be transported away from the backfire preventer and into the external pipeline.

[0011] In a further embodiment, one end of the sleeve away from the housing is connected to a pipeline connector.

[0012] The above technical solution is adopted: it is convenient to connect external pipelines, and when the internal pressure of the backfire preventer increases, the gas pressure can be transported to the outside of the device.

[0013] In a further embodiment, a return spring is sleeved on the surface of the piston rod.

[0014] The above technical solution is adopted to support the piston rod and provide reverse elastic force, so that the piston rod can return to its normal position after the pressure inside the backfire preventer returns to normal.

[0015] In a further embodiment, sliders are symmetrically mounted on the surface of the piston rod, and a sliding groove cooperating with the sliders is provided inside the sleeve.

[0016] By adopting the above technical solution, when the piston rod moves inside the sleeve, the piston rod can be limited in sliding and the friction during sliding can be reduced.

[0017] In a further embodiment, an annular groove for cooperating with the second sealing ring is formed on the surface of the cover.

[0018] Adopting the above technical solution makes it easy to install and fix the second sealing ring.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The utility model is provided with a fire stopper installed inside the shell. When the backfire preventer is installed at one end of the pipeline inside the equipment away from the external pipeline through the air inlet joint, when backfire occurs in the pipeline inside the equipment, the flame will be effectively blocked by the fire stopper to prevent the flame from entering the interior of the oxyhydrogen generator, which can effectively protect the interior of the equipment. In addition, the entire backfire preventer has a simple structure and a small size. It can be installed inside the equipment for the last line of fire prevention of the equipment, thereby improving practicality.

[0021] 2. The utility model has a sleeve installed on the outer shell, and a piston rod installed inside the sleeve. When the pressure inside the backfire preventer increases due to backfire, the piston rod will be pushed inside the sleeve, and the pressure will be relieved under the action of the exhaust hole and the hole groove, thereby preventing the backfire preventer or the internal pipeline from being damaged due to the increase in pressure, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of the structure of an embodiment of the utility model;

[0023] Figure 2 This is a cross-sectional view of the structure of an embodiment of the present utility model;

[0024] Figure 3 For this utility model Figure 2Enlarged view of point A in the middle.

[0025] In the figure: 1. Shell; 2. Cover; 3. Fire stopper; 4. First sealing ring; 5. Sleeve; 6. Piston rod; 7. Exhaust hole; 8. Hole groove; 9. Second sealing ring; 10. Air inlet connector; 11. Air outlet connector; 12. Pipe connector; 13. Return spring; 14. Slider; 15. Slide groove; 16. Annular groove. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] See also Figure 1 and Figure 2 As shown, a dry-type flashback preventer for hydrogen-oxygen mixture includes a shell 1, a cover body 2 is connected to the inner thread of the shell 1, a fire stopper 3 is placed inside the shell 1, a first sealing ring 4 used in conjunction with the fire stopper 3 is placed inside the shell 1, and a second sealing ring 9 is sleeved on the surface of the cover body 2. The second sealing ring 9 is provided to improve the sealing performance between the cover body 2 and the shell 1 to prevent gas leakage. The top of the cover body 2 is connected to an air inlet joint 10. The provision of the air inlet joint 10 facilitates the air intake and transportation of the gas inside the equipment, so that the gas is transported to the external pressure-reducing exhaust pipeline through the flashback preventer. The bottom of the shell 1 is connected to an air outlet joint 11. The provision of the air outlet joint 11, In order to facilitate the transportation of gas from the backfire preventer to the external pipeline, the surface of the cover body 2 is provided with an annular groove 16 for use with the second sealing ring 9. The setting of the annular groove 16 facilitates the installation and fixation of the second sealing ring 9. A fire stopper 3 is installed inside the shell 1. When the backfire preventer is installed in the end of the pipeline inside the equipment away from the external pipeline through the air inlet joint 10, when the pipeline inside the equipment flashes back, the flame will be effectively blocked by the fire stopper 3 to prevent the flame from entering the interior of the hydrogen-oxygen generator, which can effectively protect the interior of the equipment. In addition, the entire backfire preventer has a simple structure and a small size. It can be installed inside the equipment for the last line of fire prevention of the equipment, thereby improving practicality.

[0029] Brief description of use process: install the anti-backfire device between the hydrogen oxygen generator gas outlet and the inner pipeline, install the anti-backfire device in the equipment inner pipeline far away from the external pipeline through the gas inlet joint 10, when the equipment inner pipeline appears backfire phenomenon, the flame is effectively blocked by the fire stopping piece 3, prevents the flame from entering the inside of the hydrogen oxygen generator, can effectively protect the inside of the equipment, improves the practicability.

[0030] Please refer to Figure 2 and Figure 3 As shown in the figure, a dry type anti-backfire device for hydrogen oxygen mixed gas, the surface of the shell 1 is communicated with the sleeve 5, the inside of the sleeve 5 is slidably connected with the piston rod 6, the inside of the piston rod 6 is provided with the exhaust hole 7, the surface of the piston rod 6 is provided with the hole groove 8 communicated with the exhaust hole 7, the end of the sleeve 5 away from the shell 1 is communicated with the pipeline connector 12, through the setting of the pipeline connector 12, it is convenient to connect the external pipeline, when the internal pressure of the anti-backfire device increases, the gas pressure can be delivered to the outside of the equipment, the surface of the piston rod 6 is sleeved with the reset spring 13, through the setting of the reset spring 13, the piston rod 6 is supported and provided with reverse elastic force, so that the piston rod 6 can return to the normal position when the pressure in the anti-backfire device is normal, the surface of the piston rod 6 is symmetrically installed with the sliding block 14, the inside of the sleeve 5 is provided with the sliding groove 15 matched with the sliding block 14, through the setting of the sliding block 14 and the sliding groove 15, when the piston rod 6 moves in the sleeve 5, the piston rod 6 can be limited and the friction when sliding is reduced, through the setting of the sleeve 5 on the shell, the inside of the sleeve 5 is installed with the piston rod 6, when the internal pressure of the anti-backfire device increases due to backfire, the piston rod 6 is pushed in the sleeve 5, and the pressure relief work is carried out under the action of the exhaust hole 7 and the hole groove 8, so that the anti-backfire device or the inner pipeline is prevented from being damaged due to the increase of pressure, and the safety in use is improved.

[0031] Brief description of use process: when the internal pressure of the anti-backfire device increases due to backfire, the piston rod 6 is pushed in the sleeve 5, and the pressure relief work is carried out under the action of the exhaust hole 7 and the hole groove 8, so that the anti-backfire device or the inner pipeline is prevented from being damaged due to the increase of pressure, and the safety in use is improved.

[0032] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A dry-type flashback preventer for hydrogen-oxygen mixture, comprising a housing (1), characterized in that: The shell (1) is internally threadedly connected to a cover body (2), a fire stop plate (3) is placed inside the shell (1), a first sealing ring (4) used in conjunction with the fire stop plate (3) is placed inside the shell (1), the surface of the shell (1) is connected to a sleeve (5), the interior of the sleeve (5) is slidably connected to a piston rod (6), an exhaust hole (7) is provided inside the piston rod (6), and a hole groove (8) connected to the exhaust hole (7) is provided on the surface of the piston rod (6).

2. A dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: A second sealing ring (9) is sleeved on the surface of the cover body (2).

3. The dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: The top of the cover body (2) is connected to an air inlet connector (10).

4. The dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: The bottom of the housing (1) is connected to a gas outlet connector (11).

5. The dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: One end of the sleeve (5) away from the housing (1) is connected to a pipeline connector (12).

6. A dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: A return spring (13) is sleeved on the surface of the piston rod (6).

7. The dry-type flashback preventer for hydrogen-oxygen mixture according to claim 1, characterized in that: A sliding block (14) is symmetrically mounted on the surface of the piston rod (6), and a sliding groove (15) for use with the sliding block (14) is provided inside the sleeve (5).

8. The dry-type flashback preventer for hydrogen-oxygen mixture according to claim 2, characterized in that: The surface of the cover body (2) is provided with an annular groove (16) for use with the second sealing ring (9).

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