Negative pressure spring explosion door for flue

Abstract

The utility model discloses a flue negative pressure spring explosion door which comprises an explosion door frame, the side surface of the upper end of the explosion door frame is fixedly connected with a supporting ring, the upper surface of the supporting ring is fixedly connected with a plurality of sets of limiting rods, the side surfaces of the limiting rods are sleeved with a cover plate, a limiting ring is arranged above the cover plate, and the limiting ring is in threaded connection with the limiting rods through installation nuts. A buffering assembly is arranged below the limiting ring, a supporting plate is fixedly connected to the upper surface of the limiting ring, a transverse plate is fixedly connected to one end of the supporting plate, a sliding rod is slidably connected into the transverse plate, a top plate is fixedly connected to the lower end of the sliding rod, and a limiting block is fixedly connected to the upper end of the sliding rod. The flue explosion-proof door solves the problem that a traditional flue explosion-proof door is simple in structure and prone to deformation and damage when subjected to explosion impact, the use stability of the explosion-proof door is improved, the situation that the explosion-proof door cannot be used again is avoided, the service life of the explosion-proof door is prolonged, and meanwhile certain economic losses are reduced.

Description

Technical Field

[0001] This utility model relates to the field of spring explosion-proof door technology, specifically a flue negative pressure spring explosion-proof door. Background Technology

[0002] Normally, the flue gas side of a thermal power plant boiler operates under negative pressure. However, when a deflagration occurs in the boiler or a leak occurs in the steam-water pipeline, the negative pressure on the flue gas side instantly turns into positive pressure, causing the flue gas pressure to increase by hundreds to thousands of times. This results in the flue gas pressure exceeding the pressure-bearing capacity of the flue, ultimately causing equipment damage. Therefore, to prevent equipment damage, explosion-proof doors for the flue are installed.

[0003] Currently available explosion-proof doors for flues generally rely on gravity to seal the flue, and the connection structure between the explosion-proof door and the installed pipe is relatively simple. When subjected to an explosion impact, the structure of the explosion-proof door is prone to deformation and damage. When subjected to a large impact force, the door frame, door panel and other components are prone to bending and breakage, affecting their normal pressure relief and reset functions. In severe cases, the explosion-proof door may become unusable, resulting in certain economic losses. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a flue negative pressure spring explosion-proof door, which solves the problem that traditional flue explosion-proof doors are easily deformed and damaged when subjected to explosive impact due to their simple structure. Therefore, it improves the stability of the explosion-proof door and avoids situations where the explosion-proof door cannot be used again, thereby extending the service life of the explosion-proof door and reducing certain economic losses.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flue negative pressure spring explosion-proof door, wherein a support ring is fixedly connected to the upper side surface of the explosion-proof door frame, and multiple sets of limiting rods are fixedly connected to the upper surface of the support ring. A cover plate is fitted onto the side surface of the limiting rod, and a limiting ring is provided above the cover plate. The limiting ring is threadedly connected to the limiting rod by a nut I, and a buffer assembly is provided below the limiting ring. A support plate is fixedly connected to the upper surface of the limiting ring, and a horizontal plate is fixedly connected to one end of the support plate. A sliding rod is slidably connected inside the horizontal plate. A top plate is fixedly connected to the lower end of the sliding rod, and a limiting block is fixedly connected to the upper end of the sliding rod. A mounting flange is fixedly connected to the lower end of the explosion-proof door frame.

[0006] Preferably, the buffer assembly includes a spring I, which is sleeved on the side surface of the limiting rod. The upper end of the spring I is rotatably connected to a nut II, and the nut II is threadedly connected to the side surface of the limiting rod.

[0007] Preferably, a spring II is sleeved on the side surface of the sliding rod, and the upper end of the spring II is fixedly connected to the lower surface of the horizontal plate, the lower end of the spring II is fixedly connected to the upper surface of the top plate, and a reinforcing plate is fixedly connected to the upper surface of the top plate.

[0008] Preferably, a sealing ring is fixedly connected to the inner wall of the explosion-proof door frame, and a collar is fixedly connected to the lower surface of the cover plate, wherein the outer diameter of the collar is the same as the inner diameter of the sealing ring.

[0009] Preferably, a sealing gasket is fixedly connected to the lower end side surface of the collar, and a sealing protrusion is fixedly connected to the upper surface of the sealing gasket. A groove is formed on the lower surface of the sealing ring, and the groove corresponds to the sealing protrusion on the upper surface of the sealing gasket.

[0010] Preferably, the spring I and the limiting rod are coaxially mounted, and the coaxiality error between the spring I and the limiting rod does not exceed ±0.5 mm.

[0011] This utility model provides a flue negative pressure spring explosion-proof door. Compared with the prior art, it has the following advantages:

[0012] 1. By cooperating with the buffer component below the limiting ring and the sliding rod that is slidably connected to the upper surface of the limiting ring through the support plate and the inside of the horizontal plate, and the top plate and the spring II on the side surface of the sliding rod that are fixedly connected to the lower end of the sliding rod, the problem of deformation and damage to the traditional explosion-proof door due to its simple structure is solved. Therefore, the stability of the explosion-proof door is improved, and the situation of the explosion-proof door becoming unusable is avoided, thereby extending the service life of the explosion-proof door and reducing certain economic losses.

[0013] 2. The sealing ring and the groove on the lower surface of the sealing ring, which are fixedly connected to the inner wall of the explosion-proof door frame, cooperate with the sealing ring and the sealing convex ring, which are fixedly connected to the lower side surface of the collar and the upper surface of the collar, to improve the sealing performance of the explosion-proof door and prevent the leakage of harmful gases from the flue after an explosion, thus avoiding pollution to the surrounding environment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This utility model Figure 1 Schematic diagram of the lower structure of the middle horizontal plate;

[0016] Figure 3 This utility model Figure 1 Schematic diagram of the middle cover plate;

[0017] Figure 4 This utility model Figure 1 A schematic diagram of the cross-sectional structure of a medium-sized explosion-proof door frame.

[0018] In the diagram: 1. Explosion-proof door frame; 101. Mounting flange; 102. Support ring; 103. Limiting rod; 104. Nut I; 105. Nut II; 106. Spring I; 107. Sealing ring; 108. Groove; 2. Cover plate; 201. Collar; 202. Sealing gasket; 3. Limiting ring; 301. Support plate; 302. Horizontal plate; 303. Limiting block; 304. Spring II; 305. Sliding rod; 306. Reinforcing plate; 307. Top plate. Detailed Implementation

[0019] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a flue negative pressure spring explosion-proof door, including an explosion-proof door frame 1, a support ring 102 fixedly connected to the upper side surface of the explosion-proof door frame 1, multiple sets of limiting rods 103 fixedly connected to the upper surface of the support ring 102, a cover plate 2 sleeved on the side surface of the limiting rods 103, a limiting ring 3 provided above the cover plate 2, the limiting ring 3 being threadedly connected to the limiting rods 103 by a mounting nut Ⅰ104, a buffer assembly provided below the limiting ring 3, a support plate 301 fixedly connected to the upper surface of the limiting ring 3, a horizontal plate 302 fixedly connected to one end of the support plate 301, a sliding rod 305 slidably connected inside the horizontal plate 302, a top plate 307 fixedly connected to the lower end of the sliding rod 305, a limiting block 303 fixedly connected to the upper end of the sliding rod 305, and a mounting flange 101 fixedly connected to the lower end of the explosion-proof door frame 1.

[0021] As a technical optimization of this utility model, the buffer assembly includes a spring I 106, which is sleeved on the side surface of the limiting rod 103. The upper end of the spring I 106 is rotatably connected to a nut II 105, which is threadedly connected to the side surface of the limiting rod 103. The spring I 106 can buffer the cover plate 2 and press the cover plate 2 against the upper end of the explosion-proof door frame 1. The length of the spring I 106 can be easily adjusted by the nut II 105, thus facilitating the buffering force on the cover plate 2.

[0022] As a technical optimization of this utility model, a spring II 304 is sleeved on the side surface of the sliding rod 305. The upper end of the spring II 304 is fixedly connected to the lower surface of the horizontal plate 302, and the lower end of the spring II 304 is fixedly connected to the upper surface of the top plate 307. A reinforcing plate 306 is fixedly connected to the upper surface of the top plate 307. The spring II 304 can provide secondary buffering for the explosion-proof door frame 1, thus further protecting the explosion-proof door frame 1 and preventing deformation. Secondly, the reinforcing plate 306 can improve the sturdiness of the top plate 307, thereby better protecting the explosion-proof door frame 1.

[0023] As a technical optimization of this utility model, a sealing ring 107 is fixedly connected to the inner wall of the explosion-proof door frame 1, and a collar 201 is fixedly connected to the lower surface of the cover plate 2. The outer diameter of the collar 201 is the same as the inner diameter of the sealing ring 107. The explosion-proof door can be sealed by the collar 201 and the sealing ring 107 to prevent the leakage of harmful gases in the flue after an explosion.

[0024] As a technical optimization of this utility model, a sealing gasket 202 is fixedly connected to the lower end side surface of the collar 201, and a sealing convex ring is fixedly connected to the upper surface of the sealing gasket 202. A groove 108 is provided on the lower surface of the sealing ring 107, and the groove 108 corresponds to the sealing convex ring on the upper surface of the sealing gasket 202. The sealing gasket 202 on the lower end side surface of the collar 201 and the groove 108 on the lower surface of the sealing ring 107 can further seal the explosion-proof door, thereby improving the sealing performance of the explosion-proof door.

[0025] As a technical optimization of this utility model, the spring I106 and the limiting rod 103 are coaxially installed, and the coaxiality error between the spring I106 and the limiting rod 103 does not exceed ±0.5 mm, so as to avoid the spring from deflecting during compression and affecting the buffering effect.

[0026] In use, the explosion-proof door frame 1 is fixedly installed on the flue via the mounting flange 101. When an explosion occurs, the pressure inside the flue will increase, which will push open the cover plate 2 at the upper end of the explosion-proof door frame 1. The cover plate 2 will then move upward along the limiting rod 103. During the upward movement, the spring I 106 can buffer the cover plate 2, thereby preventing the cover plate 2 from being knocked off the explosion-proof door frame 1 by the explosion impact. When the explosion force is relatively large, the cover plate 2 will continue to move upward after being buffered by the spring I 106. At this time, the spring II 304 on the side surface of the sliding rod 305 will further buffer the cover plate 2, thus relieving the force and buffering the cover plate 2 again. At the same time, the top plate 307 at the lower end of the sliding rod 305 can support the cover plate 2, thereby preventing the cover plate 2 from being deformed or damaged after being impacted by the explosion, and extending the service life of the cover plate 2.

[0027] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas duct negative pressure spring explosion-proof door, comprising an explosion-proof door frame (1), characterized in that: The upper side surface of the explosion-proof door frame (1) is fixedly connected to a support ring (102), and the upper surface of the support ring (102) is fixedly connected to multiple sets of limiting rods (103). The side surface of the limiting rod (103) is fitted with a cover plate (2), and a limiting ring (3) is provided above the cover plate (2). The limiting ring (3) is threadedly connected to the limiting rod (103) by a nut I (104), and a buffer assembly is provided below the limiting ring (3). The upper surface of the limiting ring (3) is fixedly connected to a support plate (301), and one end of the support plate (301) is fixedly connected to a horizontal plate (302). The inside of the horizontal plate (302) is slidably connected to a sliding rod (305). The lower end of the sliding rod (305) is fixedly connected to a top plate (307), and the upper end of the sliding rod (305) is fixedly connected to a limiting block (303). The lower end of the explosion-proof door frame (1) is fixedly connected to an installation flange (101).

2. The explosion-proof door for flue gas ducts with negative pressure springs according to claim 1, characterized in that: The buffer assembly includes a spring I (106), which is sleeved on the side surface of the limiting rod (103). The upper end of the spring I (106) is rotatably connected to a nut II (105), and the nut II (105) is threadedly connected to the side surface of the limiting rod (103).

3. The explosion-proof door with a negative pressure spring for flue gas as described in claim 1, characterized in that: The sliding rod (305) has a spring II (304) sleeved on its side surface, and the upper end of the spring II (304) is fixedly connected to the lower surface of the horizontal plate (302). The lower end of the spring II (304) is fixedly connected to the upper surface of the top plate (307), and a reinforcing plate (306) is fixedly connected to the upper surface of the top plate (307).

4. The explosion-proof door with a negative pressure spring for flue gas as described in claim 1, characterized in that: The inner wall of the explosion-proof door frame (1) is fixedly connected with a sealing ring (107), and the lower surface of the cover plate (2) is fixedly connected with a collar (201), and the outer diameter of the collar (201) is the same as the inner diameter of the sealing ring (107).

5. The explosion-proof door with a negative pressure spring for flue gas as described in claim 4, characterized in that: A sealing gasket (202) is fixedly connected to the lower end side surface of the collar (201), and a sealing protrusion ring is fixedly connected to the upper surface of the sealing gasket (202). A groove (108) is provided on the lower surface of the sealing ring (107), and the groove (108) corresponds to the sealing protrusion ring on the upper surface of the sealing gasket (202).

6. The explosion-proof door for flue gas ducts with negative pressure springs according to claim 2, characterized in that: The spring I (106) and the limiting rod (103) are coaxially mounted, and the coaxiality error between the spring I (106) and the limiting rod (103) does not exceed ±0.5 mm.

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