A high-efficiency flame arrestor and explosion-proof valve suitable for dusty gas environments

Abstract

This utility model discloses a high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments, including a valve body, a valve disc, a counterweight device, and a self-locking device. The valve body includes a valve shell and a top cover plate. Inlet flanges and outlet flanges are provided on the left and right sides of the valve shell. The inner side of the inlet flange extends into the valve body and is equipped with a rubber ring. The upper side of the valve disc is welded to a rotating shaft via a rotating arm. The two ends of the rotating shaft are rotatably connected to the valve body via bearings. The counterweight device includes a counterweight, a slender rod, and a stop rod. The self-locking device is a combination of a spring pin and a locking switch. In the event of an explosion, the high-efficiency flame-arresting and explosion-proof valve provided by this utility model closes the valve disc and is locked by the self-locking device, effectively cutting off the propagation path, achieving flame arrest and explosion isolation, preventing the propagation of shock waves and flames generated by the explosion, effectively preventing secondary and multiple explosions, and effectively protecting the safety of personnel and upstream equipment.

Description

Technical Field

[0001] This utility model relates to the field of dust explosion protection, specifically a high-efficiency flame-arresting explosion-proof valve suitable for dust gas environments. Background Technology

[0002] In industrial production processes, numerous industries such as petroleum, chemical, light industry, pharmaceutical, mining, and fields involving dust control face the serious threat of explosion accidents. Once an explosion occurs, it not only severely damages production equipment but can also lead to significant casualties and property losses, and even trigger secondary or systemic explosions, resulting in even more serious consequences. On February 15, 2025, a dust explosion occurred at Qingdao Qianbaiwei Food Ingredients Co., Ltd. in Qingdao City, Shandong Province, resulting in 5 deaths. The company mainly produces seasonings. At the time of the incident, the legal representative was leading employees to debug new equipment. Preliminary analysis indicated that during the equipment installation and debugging process, friction and impact of metal debris generated mechanical sparks, triggering an initial explosion of starch dust. The shockwave then stirred up raw materials in the workshop, leading to a secondary explosion. To prevent such incidents, relevant departments should strictly supervise the implementation of explosion protection measures. Installing explosion-proof valves can effectively block the spread of flames and protect the safety of relevant personnel, containing the explosion within pipelines, avoiding equipment damage, and effectively reducing losses.

[0003] Patent search and analysis (CN201580012345.6) revealed that existing technologies mostly employ gravity-driven flap structures, such as the vertical axis swing valve in publication number CN2090540U. While these valves possess basic explosion-proof capabilities, they suffer from the following technical defects.

[0004] 1. The valve disc rotation mechanism lacks an angle limiting device, which can easily cause excessive swinging due to inertia, leading to collision and wear of the sealing surface;

[0005] 2. The spring reset mechanism has a response delay (≥0.5s), which makes it difficult to meet the 0.25s valve closing requirement specified in NFPA 69;

[0006] 3. Without a self-locking device, the valve disc may open abnormally due to the impact of a secondary explosion.

[0007] In summary, there is a need to invent a flap-type one-way explosion-proof valve that can overcome the above-mentioned defects. Therefore, this utility model designs a high-efficiency flame-arresting explosion-proof valve suitable for dusty gas environments. Utility Model Content

[0008] The purpose of this invention is to provide a high-efficiency flame arrestor and explosion-proof valve suitable for dusty gas environments, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency flame arrestor and explosion-proof valve suitable for dusty gas environments, comprising a valve body, a valve disc, a counterweight device, and a self-locking device;

[0010] The left and right pipes are fixed on the left and right sides of the valve body, respectively. The left pipe extends into the inner cavity of the valve body, and a ring is added to the inner cavity of the valve body to increase the contact area.

[0011] The valve disc is located in the inner cavity of the valve body. The upper part of the valve disc is welded and fixed to the rotating shaft. The rotating shaft at the top is rotatably connected to the side of the valve body through the first bearing seat and the second bearing seat. The rotating shaft extends out and is welded and fixed to the sleeve near the first bearing seat. A stop rod is welded and fixed at the vertical position. In the closed state, the valve disc is also in contact with the surface of the left pipe that extends into the inner cavity of the valve body.

[0012] A rubber ring is attached to the surface of the left pipe extending into the valve body, and the size of the rubber ring is slightly larger than the size of the pipe, so that it contacts the valve plate when closed.

[0013] There is a welded flat bracket on the side wall of the valve body at the position of the stop rod. The spring pin is fixed to the flat bracket with bolts. The locking switch works in conjunction with the spring pin.

[0014] Preferably, the explosion-proof valve base is integrally welded to the annular bottom surface of the explosion-proof valve housing and welded to the square side of the valve body.

[0015] Preferably, the inlet and outlet pipes include a feed pipe on the left and a discharge pipe on the right. The right end of the feed pipe on the left extends into the valve body cavity and has an annular surface designed on the right end. A rubber ring is attached to the annular surface to increase the contact area. A feed flange is installed on the left side of the feed pipe.

[0016] Preferably, the discharge pipe includes a main discharge pipe connected to the explosion-proof valve body, the size of the discharge pipe on the right side is designed to decrease from large to small, and a discharge flange is installed on the right side.

[0017] Preferably, the rotating shaft is welded to the valve disc inside the valve body via a rotating arm. The rotating shaft extends out as a step near the first bearing seat and is welded to the sleeve. A stop bar is welded to the side of the sleeve perpendicular to the rotating shaft.

[0018] Preferably, the sleeve that is welded and fixed to the rotating shaft has a slender rod welded and fixed to the upper right side of the sleeve, and a counterweight is fixed on the slender rod.

[0019] Preferably, a set of self-locking devices is provided on the outside of the explosion-proof valve housing.

[0020] Preferably, the limiting beam inside the valve body is welded and fixed to the inner surface of the valve body on both sides, which has the function of blocking the valve disc and controlling the opening angle of the valve disc. The opening angle of the valve disc is controlled between 40° and 45° to prevent the valve disc inside the valve body from opening too large, causing the flame to pass through but not to close, which would endanger relevant personnel and equipment.

[0021] Preferably, the valve body includes a valve shell, with the top and both ends of the valve shell being open. The inlet flange and outlet flange are respectively fixed to both ends of the valve shell. The flanges at both ends of the valve body serve as a connection. The bottom of the valve body is bolted to the upper cover plate, and handles are installed on the left and right sides of the upper cover plate to facilitate the handling and inspection of the various components inside the valve body for timely maintenance. Multiple fixing holes are evenly arranged around the upper cover plate to fix the upper cover plate and the valve body. The upper cover plate is fixed to the valve body at the four corners by eye bolts.

[0022] Preferably, reinforcing plates are intersected and vertically fixed on the side surface of the valve disc inside the valve body away from the feed flange. The reinforcing plates serve to strengthen the valve disc. The vertical arrangement makes the reinforcement effect better. They are symmetrical on the same side surface and welded and fixed to the rotating arm, which also serves to strengthen the valve disc. At the same time, the rotating arm is also welded and fixed to the rotating shaft.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is a one-way explosion-proof valve designed for dust explosion protection. It is used for installation on dust removal pipelines. After an explosion occurs downstream of the pipeline, when the explosion shock wave and flame act on the valve disc, the valve disc closes and fits against the rubber ring on the left feed pipeline. This can effectively prevent the hazards of the explosion and avoid the explosion from spreading to the upstream of the pipeline, thus endangering the safety of the workers. The explosion-proof valve can quickly cut off the connection between the pipeline and the outside world, ensuring the safety of the workers and equipment. Due to the existence of the self-locking device, it can effectively avoid the danger caused by secondary explosions inside the pipeline and minimize the explosion losses. Subsequently, the internal equipment can be disassembled and maintained or replaced through the top cover plate, effectively ensuring the safety of personnel. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 This is a front view of the present invention.

[0027] Figure 3 This is the left view of the present invention.

[0028] Figure 4 This is a top view of the present invention.

[0029] The components are as follows: 1. Valve body; 11. Valve shell; 111. Inlet flange; 112. Outlet flange; 113. Support seat; 114. Limiting beam; 12. Top cover plate; 121. Handle; 2. Valve disc; 21. Rotating arm; 3. Counterweight device; 31. Counterweight; 32. Slender rod; 33. Stop bar; 4. Self-locking device; 41. Spring pin; 42. Locking switch; 43. Fixed bracket; 5. Rotating shaft; 51. Sleeve; 52. Bearing seat. Detailed Implementation

[0030] The technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to the attached drawings. This utility model provides a technical solution: a high-efficiency flame arrestor and explosion-proof valve suitable for dusty gas environments, including a valve body 1, a valve disc 2 inside the valve body 1, a counterweight device 3, and a self-locking device 4.

[0032] The valve body 1 includes a valve shell 11 and an upper cover plate 12. The two ends of the valve shell 11 are respectively fixed with a feed flange 111 and a discharge flange 112. The inner section of the feed flange 111 extends into the valve shell 11, and the end face is treated with a circular surface and a rubber ring is attached.

[0033] The top and ends of the valve housing 11 extend outwards. The inlet flange 111 and outlet flange 112 are fixedly installed at both ends of the valve housing 11. The two flanges serve as a connection to facilitate the passage of gas and other media, enabling the explosion-proof valve to function as a connection in the pipeline. The upper end of the valve housing 11 is fixedly connected to the upper cover plate 12. Multiple fixing holes are evenly arranged around the upper cover plate 12. The fixing holes are used to fix the valve housing 11 and the upper cover plate 12 with bolts, and eye bolts are used to fix them at the four corners. At the same time, two handles 121 are installed and fixed on both sides of the upper cover plate 12 to facilitate the operation of personnel to pick up and inspect the various components inside the cavity and perform timely maintenance.

[0034] Valve disc 2 is installed in the inner cavity of valve body 1. When closed, valve disc 2 is in contact with the inner end face opposite to the end face of feed flange 111. The outer end face of valve disc 2 is welded and fixed to rotating arm 21. Rotating arm 21 is welded and fixed to rotating shaft 5 above valve disc 2. The two ends of rotating shaft 5 are rotatably connected to the upper side wall of valve body 1 through bearing 52. Rotating shaft 5 extends out from the first bearing seat and is welded and fixed to sleeve 51. A stop rod 33 is welded and fixed to the rotating shaft 5 in the vertical direction below sleeve 51.

[0035] A fixed bracket 43 is provided on the outer surface of the valve body 1 at the bottom position of the vertical stop 33. A spring pin 41 is placed on the fixed bracket 43 and fixed with bolts. The locking switch 42 and the spring pin 41 are used together.

[0036] The outer bottom annular surface of the valve body 1 is fixed by welding with an explosion-proof support seat 113, and the side square surface of the valve body 1 is fixed by welding with a reinforcing rod.

[0037] A limiting beam 114 is provided on the inner side of the valve body 1 to control the opening angle of the valve disc 2. This prevents the opening angle from being too large, which would cause the flame and explosion shock wave to act on the upstream of the pipeline before the valve disc 2 is closed, resulting in damage to equipment and related personnel. The limiting beam 114 extends inward on both sides of the inner side of the valve body 1, penetrating into the inner cavity of the valve body 1 and fixing the limiting beam 114. This serves to block the valve disc 2. At the same time, the angle of the limiting beam 114 is controlled so that the opening angle of the valve disc 2 is between 40° and 45°, preventing the explosion flame from passing through when the explosion-proof valve is working.

[0038] The counterweight device 3 includes a stop bar 33, a slender rod 32, and a counterweight 31. At the position of the first bearing seat, a portion of the rotating shaft 5 extends out and is welded and fixed to the sleeve 51. The stop bar 33 is welded and fixed to the side of the sleeve 51 in a direction perpendicular to the rotating shaft 5. A slender rod 32 is also welded and fixed to the upper left of the sleeve 51. The slender rod 32 needs to be threaded. The counterweight 31 is set on the top of the slender rod 32 and fixed to the slender rod 32 with a nut.

[0039] The valve disc 2 has reinforcing plates that are crossed and vertically fixed on the side surface away from the feed flange 111. The reinforcing plates serve to strengthen the valve disc 2. The vertical setting makes the reinforcement effect better. They are symmetrical on the same side surface and welded and fixed to the rotating arm 21, which also serves to strengthen the valve disc 2.

[0040] Two symmetrical rotating arms 21 are welded and fixed on the rotating shaft 5. The rotating arms 21 are welded and fixed to the valve disc 2 inside the valve body 1. The rotating shaft 5 is rotatably connected to the outer surface of the valve body 1.

[0041] A self-locking device 4 is provided on the outside of the explosion-proof valve body 1, including a spring pin 41, a locking switch 42, and a fixed bracket 43. A fixed bracket 43 is welded and fixed to the outer side of the valve body 1, located below the stop rod 33. The spring pin 41 is placed on the fixed bracket 43 and connected by bolts, so that the stop rod 33 is located inside the spring pin 41. The locking switch 42 works in conjunction with the spring pin 41. The locking switch 42 controls the opening and closing of the spring pin 41. After an explosion, the spring pin 41 needs to be opened manually to return the valve disc 2 to its original position.

[0042] This utility model provides a one-way explosion-proof valve suitable for dust explosions. It features a simple structure, convenient processing, short processing cycle, and widespread applicability in dusty environments. Installed on dusty pipelines, it prevents downstream explosions and sparks from propagating upstream, effectively isolating high-speed flames and pressure waves generated by dust explosions to prevent secondary and multiple explosions, thereby ensuring the safety of personnel and equipment. It plays a significant role in dust explosion environments.

[0043] During normal operation, valve disc 2 opens naturally by the weight of the counterweight device 3, and the distance and opening angle of valve disc 2 are controlled by the limiting beam 114 fixed on the inner surface of valve body 1.

[0044] After the explosion, the blast impact upstream of the pipeline acts on valve disc 2, causing it to close instantly. The stop lever 33 is positioned at the spring pin 41. At this time, the locking switch 42 immediately pops out after the stop lever 33 enters the spring pin 41, preventing the stop lever 33 from returning to its original position. This prevents sparks and blast impacts from reaching upstream of the pipeline. Simultaneously, the self-locking device 4 is activated. Without human intervention, valve disc 2 and the feed flange 111 end face remain closed, effectively preventing secondary or multiple explosions and preventing the shock wave and flames from returning to the pipeline, thus ensuring the safety of personnel and equipment upstream of the pipeline.

[0045] 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 specific implementations. 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. A high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments, characterized in that: The valve body (1) includes a valve disc (2) inside the valve body, a counterweight device (3), and a self-locking device (4). The valve body (1) includes a valve shell (11), an upper cover plate (12), a feed flange (111), and a discharge flange (112). The valve disc (2) is located inside the valve body (1). When the valve disc (2) inside the valve body (1) closes, it needs to contact the surface of the feed flange (111). A rubber ring is attached to the inner end of the feed flange (111) inside the valve body (1) to reduce the impact of the explosion. The upper side of the valve disc (2) is welded to the rotating shaft (5). The two ends of the rotating shaft (5) are rotatably connected to the valve body (1) through bearings (52). The counterweight device (3) includes a counterweight (31), a slender rod (32) connecting the counterweight, and a stop rod (33). The self-locking device (4) includes a spring pin (41), a locking switch (42), and a fixed bracket (43).

2. The high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments according to claim 1, characterized in that: The valve body (11) and the upper cover plate (12) are connected by bolts and connected by eye bolts around the perimeter. Two handles (121) are installed on the upper cover plate (12). The two ends of the valve body (1) are respectively the feed flange (111) and the discharge flange (112) fixed at the two ends of the valve body (1). The inner end of the feed flange (111) extends into the interior of the valve body (1) and is designed as a ring. The end face of the discharge flange (112) on the right side does not need to extend into the interior of the valve body (1), and its size decreases from large to small. Limiting beams (114) are set at both ends of the side of the valve body (1) and extend into the interior of the valve body (1), and the limiting beams (114) are fixed.

3. The high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments according to claim 1, characterized in that: The valve disc (2) contacts the limiting beam (114) at a distance away from the feed flange (111), and a set of reinforcing plates are vertically fixed on one side surface. The valve disc (2) is welded and fixed to the rotating arm (21).

4. The high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments according to claim 3, characterized in that: The rotating arm (21) and the rotating shaft (5) are welded and fixed, and the rotating arm (21) and the valve disc (2) are welded and fixed.

5. The high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments according to claim 1, characterized in that: The self-locking device (4) is set on the outside of the explosion-proof valve body (1).

6. The high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments according to claim 5, characterized in that: The self-locking device (4) is welded and fixed to a rotating shaft (5) and a sleeve (51) on one side, and welded and fixed to a stop rod (33) in a vertical position. A fixed bracket (43) is installed at the vertical position of the stop rod (33) at the valve body (1). The spring pin (41) is fixed to the bracket by screws. The locking switch (42) and the spring pin (41) are used together.

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