Anti-backfire device for gas engineering

Abstract

The utility model discloses an anti-backfire device for gas engineering, and relates to the technical field of gas engineering. The device comprises two mounting cylinders which are symmetrically arranged left and right; three positioning sleeves which are linearly connected are arranged at the position between the two mounting cylinders, metal net discs are arranged at the positions inside the positioning sleeves, the hole diameters of meshes of the metal net discs are sequentially reduced from right to left, and the upper surface walls of the metal net discs are sleeved with assembling sleeves which abut against the two ends of the positioning sleeves; and two assembling screw rods which are symmetrical front and back are arranged at the lower position between the two mounting cylinders, positioning toothed plates are arranged at the lower positions of the left end and the right end of each assembling screw rod, and spiral ring blocks which are spirally arranged on the assembling screw rods are arranged over the positioning toothed plates. The assembling sleeve and the positioning sleeve are combined for use, so that the metal net disc is convenient to clean or replace, and meanwhile, the positioning toothed plate is in meshed connection with the spiral ring block, so that the assembling stability between the structures is improved.

Description

Technical Field

[0001] This utility model belongs to the field of gas engineering technology, and in particular relates to a backfire prevention device for gas engineering. Background Technology

[0002] In the event of an accident or system instability, when the gas pressure in the pipe decreases, the flame at the combustion point can spread towards the gas source through the pipe, a phenomenon known as flashback. Devices designed to prevent and block this flashback are called flashback arrestors. In gas engineering projects, a large number of gas pipelines are used, and appropriate flashback prevention devices are required to ensure the safe use of these pipelines.

[0003] However, existing backfire prevention devices mostly use metal mesh discs to block fires internally. Over long-term use, the mesh of these discs accumulates dirt and wear. Cleaning or replacement requires disassembling the entire device from the pipeline, which reduces efficiency due to the lack of a mechanism to disassemble the metal mesh disc. Furthermore, most backfire prevention devices use bolted connections, which can loosen over time, leading to insufficient structural stability. Therefore, we provide a backfire prevention device for gas engineering to address these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a backfire prevention device for gas engineering. By combining the assembly and positioning sleeve, it is convenient to clean or replace the metal mesh disc. At the same time, the meshing connection between the positioning tooth plate and the screw ring block improves the assembly stability of the structure.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a backfire prevention device for gas engineering, comprising two mounting cylinders arranged symmetrically from left to right; three positioning sleeves arranged linearly connected between the two mounting cylinders, each with a metal mesh disc inside, the mesh size of each metal mesh disc decreasing from right to left, and an assembly fitting fitted on the upper surface of each metal mesh disc that abuts against both ends of the positioning sleeve; two symmetrical assembly screws arranged between the two mounting cylinders below each other, and positioning tooth plates located below the left and right ends of each assembly screw; a spiral ring block spirally mounted on the assembly screw is located directly above each positioning tooth plate, and the circumference of the spiral ring block engages with the positioning tooth plate through toothed openings.

[0007] The present invention is further provided with a sealing strip between the metal mesh disc and the positioning sleeve and the mounting kit, and a sealing strip between the positioning sleeve and the mounting kit and the mounting cylinder.

[0008] The present invention is further configured such that both ends of the positioning sleeve are provided with notches, and both ends of the mounting sleeve are fixed with protrusions that are inserted into the positions inside the notches.

[0009] The present invention is further configured such that the lower part of the side of the positioning sleeve is fixed with an installation strip, and the side of the mounting cylinder is fixed with an abutting block that abuts against the adjacent installation strip.

[0010] The present invention is further configured such that the side wall of the mounting strip has two symmetrically arranged assembly holes, and the side wall of the abutment block has a through hole at the position corresponding to the assembly hole, and the assembly screw passes through the corresponding through hole and the assembly hole respectively.

[0011] The present invention is further configured such that each end face of the abutment block corresponding to the positioning tooth plate is provided with a movable hole, one end of the positioning tooth plate is inserted into the port position of the movable hole, a spring is fixed on the end face of the positioning tooth plate and one end is fixedly connected to the inner end face of the movable hole, a cross post passing through the inner position of the spring is fixed on the inner end face of the movable hole, and the positioning tooth plate is fitted onto the cross post through a cross opening on the side wall.

[0012] The present invention is further configured such that a limiting block is fixed on the upper part of the side of the device, and two symmetrically arranged insertion holes are opened through the side wall of the limiting block.

[0013] The present invention is further configured such that a slider is slidably provided on the surface of the mounting cylinder to abut against the limiting block, and an insertion rod inserted into the insertion hole is fixed on the end face of the slider, with the end faces of the two insertion rods in the same left-right direction abutting against each other.

[0014] The present invention is further configured such that a connecting plate is fixed on the side of the mounting cylinder away from the slider, and a screw hole is provided through the middle of the connecting plate. A progressive screw is provided on the other end face of the slider, which spirals through the inside of the screw hole.

[0015] The present invention is further configured such that a T-shaped hole is provided at the part of the slider relative to the advancing screw, a T-shaped rod is fixed at one end of the advancing screw to cooperate with the T-shaped hole, a rotating block is fixed at the other end of the advancing screw, a positioning hole is provided through the side wall of the connecting plate located in front of and behind the screw hole, and a positioning rod is fixed at the end face of the slider to slide through the inside of the positioning hole.

[0016] This utility model has the following beneficial effects:

[0017] Remove the corresponding positioning sleeve from the assembly to expose the metal mesh disc, which can then be directly removed from inside the positioning sleeve. This allows for the disassembly of the metal mesh disc, facilitating quick cleaning of the mesh openings and enabling replacement of the metal mesh disc.

[0018] When the screw ring block can no longer be turned, loosening the positioning tooth plate will cause the positioning tooth plate to mesh with the teeth on the side wall of the screw ring block. Therefore, after the positioning tooth plate is prevented from rotating, the screw ring block will not be able to rotate, thus ensuring that the screw ring block will not come loose on the assembly screw.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a backfire prevention device used in gas engineering.

[0022] Figure 2 This is a structural diagram of the positioning sleeve, the mounting kit, and the metal mesh tray in this utility model.

[0023] Figure 3 This is a structural diagram of the mounting cylinder in this utility model.

[0024] Figure 4 This is a structural diagram of the positioning toothed plate in this utility model.

[0025] Figure 5 This is a structural diagram of the abutment block in this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1-Installation cylinder, 101-Flange pipe, 102-Abutment block, 103-Connecting plate, 104-Screw hole, 105-Positioning hole, 106-Modible hole, 107-Cross post, 108-Through hole, 2-Positioning sleeve, 201-Installation strip, 202-Assembly hole, 203-Notch, 3-Assembly kit, 301-Limiting block, 302-Insertion hole, 303-Protrusion, 4-Assembly screw, 5-Positioning toothed plate, 501-Screw ring block, 502-Toothed edge, 503-Crossed edge, 504-Spring, 6-Slider, 601-Insertion rod, 602-Positioning rod, 603-T-shaped hole, 604-Progressive screw, 605-Rotating block, 606-T-shaped rod, 7-Metal mesh tray. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] Please see Figures 1 to 5 This utility model is a backfire prevention device for gas engineering. By combining the assembly sleeve 3 and the positioning sleeve 2, it is convenient to clean or replace the metal mesh plate 7. At the same time, the meshing connection between the positioning tooth plate 5 and the screw ring block 501 improves the assembly stability between the structures.

[0031] Specifically, there are two mounting cylinders 1 arranged symmetrically from left to right; three positioning sleeves 2 are arranged linearly between the two mounting cylinders 1, and a metal mesh disc 7 is opened inside each positioning sleeve 2. The mesh diameter of each metal mesh disc 7 decreases from right to left. The upper surface of each metal mesh disc 7 is fitted with a fitting 3 that abuts against both ends of the positioning sleeve 2. Two mounting screws 4 are arranged symmetrically from front to back below the two mounting cylinders 1. Positioning tooth plates 5 are set below the left and right ends of each mounting screw 4. Above the positioning tooth plate 5, there are screw ring blocks 501 spirally mounted on the assembly screw 4. The circumference of the screw ring blocks 501 is engaged with the positioning tooth plate 5 through the toothed openings 502. A sealing strip is provided between the metal mesh disc 7 and the positioning sleeve 2 and the mounting sleeve 3. A sealing strip is provided between the positioning sleeve 2, the mounting sleeve 3 and the mounting cylinder 1. A notch 203 is provided on both ends of the positioning sleeve 2. A protrusion 303 is fixed to both ends of the mounting sleeve 3 and inserted into the notch 203. A flange tube 101 is fixed to the opposite ends of the two mounting cylinders 1.

[0032] The operation process of this embodiment is as follows: The mounting cylinder 1 is assembled at the gas pipe position of the gas project through the flange pipe 101. Therefore, the metal mesh disc 7 is located between two mounting cylinders 1. Thus, when the flame retreats to the position in the mounting cylinder 1, the metal mesh disc 7 prevents backfire. At the same time, when disassembling different metal mesh discs 7, the mounting sleeve 3 is removed from the corresponding positioning sleeve 2, thereby exposing the metal mesh disc 7. The metal mesh disc 7 can then be directly removed from inside the positioning sleeve 2, thus disassembling the metal mesh disc 7. This facilitates quick cleaning of its mesh area and allows for further cleaning of the metal mesh disc 7. In addition, when multiple positioning sleeves 2 and mounting cylinders 1 are assembled and connected, they are screwed onto the assembly screw 4 by screw ring blocks 501. Then, two screw ring blocks 501 abut against multiple positioning sleeves 2, so that multiple positioning sleeves 2 are relatively squeezed together, improving the sealing between the structures. At the same time, when the screw ring blocks 501 can no longer be screwed, the positioning tooth plate 5 is loosened, which will cause the positioning tooth plate 5 to mesh with the toothed edge 502 of the peripheral side wall of the screw ring block 501. Therefore, after the positioning tooth plate 5 is not rotated, the screw ring block 501 will not be able to rotate, thus ensuring that the screw ring block 501 will not be loosened on the assembly screw 4.

[0033] Example 2

[0034] Please see Figure 2 , Figure 3 and Figure 4 Based on Example 1, the positioning toothed plate 5 moves inside the movable hole 106 to ensure that the positioning toothed plate 5 will not cause any rotational interference to the screw ring block 501.

[0035] Specifically, mounting strips 201 are fixed to the lower part of the outer side of the positioning sleeve 2, and abutting blocks 102 that abut against the mounting strips 201 are fixed to the outer side of the mounting cylinder 1. The side wall of the mounting strip 201 has two symmetrically arranged assembly holes 202. The side wall of the abutting block 102 has a through hole 108 at the position corresponding to the assembly hole 202. The assembly screw 4 passes through the corresponding through hole 108 and the assembly hole 202 respectively. The abutting block 102 has a movable hole 106 at the end face of the positioning tooth plate 5. One end of the positioning tooth plate 5 is inserted into the port position of the movable hole 106. A spring 504 is fixed to the end face of the positioning tooth plate 5, and a cross post 107 passing through the inside of the spring 504 is fixed to the inner end face of the movable hole 106. The positioning tooth plate 5 is fitted onto the cross post 107 through a cross opening 503 on its side wall.

[0036] In this embodiment, the operation process is as follows: when the screw ring block 501 is rotated onto the assembly screw 4, the positioning tooth plate 5 needs to be pressed into the movable hole 106. As a result, the positioning tooth plate 5 will compress the spring 504. Therefore, after the screw ring block 501 is screwed onto the assembly screw 4, the positioning tooth plate 5 is released. As a result, the spring 504 will push the positioning tooth plate 5 out of the movable hole 106 and make the positioning tooth plate 5 mesh with the screw ring block 501, ensuring that the positioning tooth plate 5 will not interfere with the rotation of the screw ring block 501. At the same time, the positioning tooth plate 5 is inserted into the cross mouth 503 through the cross post 107, thereby ensuring that the positioning tooth post will not rotate, thus ensuring that the screw ring block 501 cannot rotate.

[0037] Example 3

[0038] Please see Figure 2 , Figure 3 and Figure 5 Based on Example 1, the sliding of the progressive screw 604 within the screw hole 104 facilitates control of the movement of the abutment block 102.

[0039] Specifically, each of the upper parts of the mounting cylinder 3 has a limiting block 301 fixed on its surface. Each limiting block 301 has two symmetrically arranged insertion holes 302 penetrating through its side wall. Each of the mounting cylinder 1 has a sliding block 6 that abuts against the limiting block 301. The end face of the sliding block 6 is fixed with a rod 601 inserted into the insertion hole 302. The end faces of the two rods 601, which are aligned in the left-right direction, abut against each other. A connecting plate 103 is fixed on the mounting cylinder 1 at a position away from the sliding block 6. Each connecting plate 103 has a threaded hole 104 penetrating through its center. The other end face of the slider 6 is provided with a progressive screw 604 that spirals through the inside of the screw hole 104. The slider 6 is provided with T-shaped holes 603 at the part of the progressive screw 604. One end of the progressive screw 604 is fixed with a T-shaped rod 606 that cooperates with the T-shaped hole 603. The other end of the progressive screw 604 is fixed with a rotating block 605. The side walls of the connecting plate 103 located in front of and behind the screw hole 104 are provided with positioning holes 105. The end face of the slider 6 is fixed with a positioning rod 602 that slides through the inside of the positioning hole 105.

[0040] The operation process of this embodiment is as follows: When it is necessary to ensure the stability of the position of the assembly 3, the assembly 3 is connected to the corresponding positioning sleeve 2, which will cause the limiting blocks 301 on each assembly 3 to abut against each other. Then, the rotating block 605 is controlled to rotate and move, so the rotating block 605 will rotate and move in the screw hole 104 through the advancing screw 604, and thus push the abutting block 102 to move through the T-shaped rod 606, and will abut the slider 6 against the limiting block 301, and insert the insertion rod 601 into the corresponding insertion hole 302, assembling and positioning the limiting block 301, thereby installing the assembly 3. At the same time, when the slider 6 moves, it will drive the positioning rod 602 to slide in the positioning hole 105, moving the sliding position of the slider 6.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-backfire device for gas engineering, comprising two installation cylinders (1) arranged in left-right symmetry; characterized in that: Three positioning sleeves (2) are arranged linearly between the two mounting cylinders (1). A metal mesh disk (7) is provided inside each positioning sleeve (2). The mesh diameter of each metal mesh disk (7) decreases from right to left. The upper surface of each metal mesh disk (7) is fitted with a fitting (3) that abuts against both ends of the positioning sleeve (2). Two symmetrical assembly screws (4) are provided below the two mounting cylinders (1). A positioning tooth plate (5) is provided below the left and right ends of each assembly screw (4). A spiral ring block (501) is provided directly above the positioning tooth plate (5) and is spirally mounted on the assembly screw (4). The circumference of the spiral ring block (501) is engaged with the positioning tooth plate (5) through the toothed opening (502). A flange pipe (101) is fixed on the opposite end face of the two mounting cylinders (1).

2. A flashback arrestor for gas engineering according to claim 1, characterized in that A sealing strip is provided between the metal mesh disk (7) and the positioning sleeve (2) and the mounting sleeve (3), and a sealing strip is provided between the positioning sleeve (2), the mounting sleeve (3) and the mounting cylinder (1).

3. A flashback arrestor for gas engineering according to claim 1, characterized in that The positioning sleeve (2) has notches (203) on both ends, and the mounting sleeve (3) has protrusions (303) fixed on both ends, which are inserted into the notches (203).

4. A flashback guard for a gas appliance as claimed in claim 1, characterised in that, The lower part of the outer side of the positioning sleeve (2) is fixed with an installation strip (201), and the outer side of the mounting cylinder (1) is fixed with an abutting block (102) that abuts against the adjacent installation strip (201).

5. A flashback guard for a gas appliance as claimed in claim 4, characterised in that, The side wall of the mounting strip (201) has two symmetrically arranged assembly holes (202). The side wall of the abutment block (102) has a through hole (108) at the position corresponding to the assembly hole (202). The assembly screw (4) passes through the corresponding through hole (108) and the assembly hole (202) respectively.

6. A flashback arrestor for gas engineering according to claim 5, characterised in that The abutment block (102) has a movable hole (106) on the end face of the positioning tooth plate (5). One end of the positioning tooth plate (5) is inserted into the port position of the movable hole (106). A spring (504) is fixed on the end face of the positioning tooth plate (5) and its end is fixedly connected to the inner end face of the movable hole (106). A cross post (107) passing through the inner position of the spring (504) is fixed on the inner end face of the movable hole (106). The positioning tooth plate (5) is fitted onto the cross post (107) through a cross opening (503) on its side wall.

7. A flashback guard for gas appliances as claimed in claim 1, wherein, Each of the above-ground parts of the assembly (3) has a limiting block (301) fixed on its upper part. Each of the limiting blocks (301) has two symmetrically arranged insertion holes (302) through its side wall.

8. A flashback guard for a gas appliance as claimed in claim 7, characterised in that, The mounting cylinder (1) is slidably provided with sliders (6) that abut against the limiting block (301). The end face of the slider (6) is fixed with a plug rod (601) inserted into the insertion hole (302). The end faces of the two plug rods (601) in the same left and right direction abut against each other.

9. A flashback guard for a gas appliance as claimed in claim 8, characterised in that, A connecting plate (103) is fixed on the side of the mounting cylinder (1) away from the slider (6). A screw hole (104) is provided through the middle of the connecting plate (103). A progressive screw (604) is provided on the other end face of the slider (6) and spirally passes through the screw hole (104).

10. A flashback guard for a gas appliance as claimed in claim 9, characterised in that, The slider (6) has T-shaped holes (603) at the position relative to the advancing screw (604). One end of the advancing screw (604) is fixed with a T-shaped rod (606) that cooperates with the T-shaped hole (603). The other end of the advancing screw (604) is fixed with a rotating block (605). The side walls of the connecting plate (103) located in front of and behind the screw hole (104) are all provided with positioning holes (105). The end face of the slider (6) is fixed with a positioning rod (602) that slides through the inside of the positioning hole (105).

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