An explosion door for precisely controlling the release pressure

Abstract

An explosion door with precise control of the relief pressure, the relief cylinder one end port connected to the protected flue or equipment, the other end port connected to the holder; holder has a diaphragm assembly, the diaphragm assembly is configured as a breakable component when pressure relief and covers the block at the other end of the relief cylinder port; cutter device is configured above the holder diaphragm assembly; spring device is fixedly installed on the holder, the cutter device is slidingly arranged on the spring device, so that the cutter device is driven by the spring device to move downward to cut the diaphragm assembly when pressure relief is needed; push rod device is fixedly installed on the holder and is in separable contact with the spring device, so as to limit and lock the spring device in normal state, or to release the limit constraint of the spring device in overpressure state; pressure measuring control device is connected to the relief cylinder and is in signal connection with the push rod device, for monitoring the pressure in the relief cylinder and outputting a control signal to the push rod device. The ordinary material film plate can be used, and the explosion pressure can be precisely controlled.

Description

Technical Field

[0001] This utility model belongs to the field of industrial furnace flue gas treatment engineering, and relates to overpressure protection technology, specifically an explosion-proof door that precisely controls the pressure release. Background Technology

[0002] In the process of treating industrial furnace flue gas for dust removal, desulfurization, and denitrification, overpressure protection devices are required to prevent damage to related treatment equipment and flue ducts. Mechanical pressure relief valves and diaphragm-type explosion-proof doors are the most common. Diaphragm-type explosion-proof doors are widely used due to their simple design, light weight, and easy installation. However, in practical use, existing diaphragm-type explosion-proof doors have the following drawbacks:

[0003] First, diaphragm plates with constant burst pressure are expensive. Currently, the burst pressure set on flue gas systems is generally below 10 kPa, typically using austenitic stainless steel flat slotted rupture discs. Each batch of rupture discs undergoes rigorous testing and trial detonation, resulting in high prices. In actual production, many manufacturers use self-made diaphragm plates to reduce costs, but the burst pressure of self-made diaphragm plates cannot be guaranteed.

[0004] Secondly, because the flue gas contains a certain amount of dust and corrosive substances, after the membrane plate of the explosion-proof door has been installed for a certain period of time, the actual burst pressure deviates from the design value due to dust accumulation, corrosion and other reasons, which makes it impossible to guarantee the safety of production. Utility Model Content

[0005] In order to overcome the problems of existing diaphragm-type explosion-proof doors, this utility model provides an explosion-proof door that can precisely control the pressure release. It can use ordinary asbestos board, rubber board or thin metal board as the diaphragm, and can precisely control the burst pressure to ensure production safety.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An explosion-proof door with precise control of pressure relief includes:

[0008] The pressure relief cylinder has one end connected to the flue or equipment to be protected, and the other end connected to the clamp.

[0009] A clamp having a diaphragm assembly configured as a destructible component in the event of pressure relief and covering and sealing the other end port of the pressure relief cylinder;

[0010] A cutting device is positioned above the clamping diaphragm assembly;

[0011] A spring device is fixedly installed on the clamp, and a cutter device is slidably mounted on the spring device. When pressure needs to be released, the spring device drives the cutter device to move downward to cut the diaphragm assembly.

[0012] The push rod device is fixedly mounted on the clamp and can be separated from the spring device. It is used to limit and lock the spring device under normal conditions, or to release the limit constraint on the spring device under overpressure conditions.

[0013] The pressure control device is connected to the pressure relief cylinder and signal-connected to the push rod device. It is used to monitor the pressure inside the pressure relief cylinder and output control signals to the push rod device.

[0014] Furthermore, the clamp includes: an upper flange, a diaphragm assembly, a lower flange, and flange bolts; the diaphragm assembly is assembled between the upper flange and the lower flange, and the three are locked together by a number of flange bolts; the lower flange is fixedly connected to the pressure relief cylinder.

[0015] Furthermore, the diaphragm assembly includes an upper gasket, a lower gasket, and a diaphragm plate sandwiched between the upper and lower gaskets; when the diaphragm plate is made of a flexible material, the upper and lower gaskets are omitted.

[0016] Furthermore, the cutting device includes an annular cutter, guide sleeve A, guide sleeve B, guide rod A, guide rod B, and spring guide sleeve; the outer diameter of the annular cutter is smaller than the inner diameter of the pressure relief cylinder; guide rod A and guide rod B are respectively fixedly connected to the upper flange of the clamp; guide sleeve A, guide sleeve B, and spring guide sleeve are respectively fixedly connected to the upper part of the annular cutter and distributed circumferentially; guide sleeve A is correspondingly slidably sleeved on guide rod A; guide sleeve B is correspondingly slidably sleeved on guide rod B; and spring guide sleeve is correspondingly slidably sleeved on the spring device.

[0017] Furthermore, the spring device includes a spring rod, a spring, and a clamping bolt; the spring rod is vertically and fixedly connected to the upper flange of the clamp; the clamping bolt is fitted onto the top of the spring rod and the two are threaded together; the spring guide sleeve is slidably fitted onto the spring rod; the spring is fitted onto the spring rod and connected between the clamping bolt and the spring guide sleeve.

[0018] Furthermore, the push rod device includes a push rod bracket and a push rod; the lower end of the push rod bracket is fixedly connected to the upper flange sidewall of the clamp, and the push rod is fixedly mounted on the top of the push rod bracket; the push rod output shaft extends outward under normal conditions and engages with the lower edge of the spring guide sleeve so that the spring is compressed and contracted between the clamping bolt and the spring guide sleeve; the push rod output shaft retracts inward under overpressure conditions to release the engagement with the spring guide sleeve so that the spring force is released.

[0019] Furthermore, the push rod is an electric push rod or an electro-hydraulic push rod.

[0020] Furthermore, the pressure control device includes a pressure measuring device and a contactor. The pressure measuring device includes a pressure guiding tube and a pressure switch. One end of the pressure guiding tube is connected to the pressure relief cylinder, and the other end is connected to the pressure switch. The on / off signal of the pressure switch is connected to the contactor, and the contactor is connected to the push rod signal to control the push rod action.

[0021] Furthermore, the lower edge of the annular cutter is serrated.

[0022] Furthermore, the annular cutter has a C-shaped structure with a notch.

[0023] The beneficial effects of this utility model include:

[0024] This explosion-proof door uses a pressure control device to accurately measure the pressure inside the pressure relief cylinder in real time. When the pressure exceeds the set threshold, the pressure control device controls the push rod device to quickly release the constraint on the spring device through a switch signal. The spring force is released instantly, causing the spring device to drive the cutter device to move downwards and accurately cut the diaphragm assembly. The whole process is responsive and the burst pressure is precisely controlled, which improves the safety of the flue gas system. It eliminates the need to use expensive flat slotted diaphragm panels and can use diaphragm panels made of common materials such as asbestos boards, rubber boards, non-asbestos fiber boards, and thin metal boards, thus reducing the cost of use. Attached Figure Description

[0025] Figure 1 This is a front view of the overall structure of this utility model;

[0026] Figure 2 This is a top view of the overall structure of this utility model.

[0027] In the diagram: 1-Pressure relief cylinder, 2-Clamping device, 201-Upper flange, 202-Upper gasket, 203-Diaphragm plate, 204-Lower gasket, 205-Lower flange, 206-Flange bolt, 3-Cutter device, 301-Spring guide sleeve, 302-Guide rod A, 303-Guide sleeve A, 304-Guide rod B, 305-Guide sleeve B, 306-Annular cutter, 4-Spring device, 401-Spring rod, 402-Spring, 403-Clamping bolt, 5-Push rod device, 501-Push rod bracket, 502-Push rod, 6-Pressure measuring device, 601-Pressure guide tube, 602-Pressure switch, 7-Contaminator. Detailed Implementation

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

[0029] In the description of this utility model, it should be noted that the terms "A" and "B" are used only to distinguish components and should not be construed as indicating or implying relative importance. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] This utility model provides an explosion-proof door for precisely controlling pressure relief, comprising: a pressure relief cylinder 1, a clamp 2, a cutter device 3, a spring device 4, a push rod device 5, a pressure measuring device 6, and a contactor 7. (Reference) Figures 1-2 :

[0031] The clamp 2 includes an upper flange 201, an upper gasket 202, a diaphragm plate 203, a lower gasket 204, a lower flange 205, and flange bolts 206. The diaphragm plate 203 is clamped between the upper gasket 202 and the lower gasket 204 to form a diaphragm assembly. The diaphragm assembly is assembled between the upper flange 201 and the lower flange 205, and the three are locked together by a number of flange bolts 206 to form a sealing structure. The clamping force required for sealing is provided by the multiple flange bolts 206.

[0032] Considering that the flexible diaphragm can replace the sealing function of the gasket due to its own elasticity, the upper gasket 207 and the lower gasket 204 can be omitted when the diaphragm 203 is made of a flexible material. When the diaphragm 203 is made of a rigid material, the upper and lower gaskets are used to compensate for its sealing reliability.

[0033] One end of the pressure relief cylinder 1 is connected to the flue or equipment to be protected, and the other end is fixedly welded to the lower flange 205 of the clamp 2. After welding, the diaphragm assembly covers and seals the other end of the pressure relief cylinder 1.

[0034] The cutting device 3 includes an annular cutter 306, guide sleeve A303, guide sleeve B305, guide rod A302, guide rod B304, and spring guide sleeve 301. The annular cutter 306 is positioned above the diaphragm assembly of the clamp 2 and its outer diameter is smaller than the inner diameter of the pressure relief cylinder 1. The lower edge of the annular cutter 306 is serrated and sharpened. The annular cutter 306 has a C-shaped structure with a notch, that is, the annular cutter 306 is not a complete circle and has a certain notch. The central angle of the notch is 30 to 60° to avoid the safety hazard of the diaphragm assembly falling off or flying off as a whole after it bursts.

[0035] Guide rods A302 and B304 are fixedly welded to the upper flange 201 of the clamp 2; guide sleeves A303, B305, and spring guide sleeve 301 are fixedly welded to the upper part of the annular cutter 306 and are distributed circumferentially to form a sliding whole; guide sleeve A303 is slidably sleeved on guide rod A302; guide sleeve B305 is slidably sleeved on guide rod B304; spring guide sleeve 301 is slidably sleeved on spring rod 401 of spring device 4, so that guide sleeves A303, B305, and 301 can slide up and down along guide rods A302, B304, and 401 respectively;

[0036] The spring device 4 includes a spring rod 401, a spring 402, and a clamping bolt 403. The spring rod 401 is vertically and fixedly connected to the upper flange 201 of the clamp 2. The clamping bolt 403 is fitted onto the top of the spring rod 401 and the two are threaded together. The spring force of the spring 402 can be adjusted by the clamping bolt 403. The spring guide sleeve 301 is slidably fitted onto the spring rod 401. The spring 402 is fitted onto the spring rod 401 and connected between the clamping bolt 403 and the spring guide sleeve 301. Under the action of the spring 402, the spring guide sleeve 301 can slide up and down along the spring rod 401, thereby driving the guide sleeves A303 and B305 to slide up and down along the guide rods A302 and B304, respectively.

[0037] The push rod device 5 includes a push rod bracket 501 and a push rod 502; the lower end of the push rod bracket 501 is fixedly connected to the side wall of the upper flange 201 of the clamp 2, and the push rod 502 is fixedly installed on the top of the push rod bracket 501; the output shaft of the push rod 502 extends outward under normal conditions and is engaged with the lower edge of the spring guide sleeve 301 so that the spring 402 is compressed and contracted between the clamping bolt 403 and the spring guide sleeve 301, so that the spring guide sleeve 301 cannot move downward; when there is overpressure, the pressure measuring control device controls the output shaft of the push rod 502 to retract, release the engagement with the spring guide sleeve 301 so that the spring force of the spring 402 is released, and the spring guide sleeve 301 drives the annular cutter 306 to move downward under the action of the spring 402, cutting the diaphragm plate 203.

[0038] The push rod 502 is an electric push rod or an electro-hydraulic push rod, preferably an electric push rod.

[0039] The pressure measuring device 6 includes a pressure guide tube 601 and a pressure switch 602; one end of the pressure guide tube 601 is connected to the pressure relief cylinder 1, and the other end is connected to the pressure switch 602; the on / off signal of the pressure switch 602 is connected to the contactor 7, and the contactor 7 is connected to the push rod 502 to control the action of the push rod 502.

[0040] This explosion-proof door uses a pressure switch 602 to accurately measure the pressure of the flue gas, and controls the contactor 7 to retract the push rod 502 through a switch signal. This triggers the spring device 4, which drives the cutter device 3 to cut open the ordinary membrane 203. This achieves precise control of the burst pressure, improves the safety of the flue gas system, and prevents the actual burst pressure from being affected by dust accumulation or corrosion. At the same time, it eliminates the need for expensive flat slotted membranes and can use ordinary materials such as asbestos boards, rubber boards, non-asbestos fiber boards, and thin metal boards to make the membranes, thus reducing the cost of use.

[0041] Example 1: The explosion-proof door is designed with a burst pressure of 8 kPaG and a diameter of DN500. The diaphragm plate 203 is made of 4mm asbestos board, and the upper gasket 202 and lower gasket 204 are omitted. The pressure relief cylinder 1 has a diameter of DN500. The upper flange 201 and lower flange 205 of the clamp 2 are DN500 plate-type flat-welded flanges, with matching flange bolts 206.

[0042] The outer diameter of the annular cutter 306 is slightly smaller than the inner diameter of the pressure relief cylinder 1, and the lower edge is serrated and sharpened. The annular cutter 306 is not a complete circle and has a certain notch. In this embodiment, the central angle of the notch is α = 60°.

[0043] In this embodiment, the push rod 502 is an electric push rod.

[0044] The pressure switch 602 is set to a pressure of 8 kPaG. The on / off signal of the pressure switch 602 is connected to the contactor 7, thereby controlling the output shaft of the push rod 502.

[0045] Based on the specific structural design of this explosion-proof door, its overall working process is as follows:

[0046] When the flue gas pressure is lower than the set pressure, the output shaft of the push rod 502 is in the extended state, which just blocks the lower edge of the spring guide sleeve 301 of the cutter device 3, preventing it from moving downward; at this time, the flue gas is sealed in the flue gas system by the clamp 2 and the pressure relief cylinder 1.

[0047] When the flue gas pressure exceeds the set value, the pressure switch 602 is activated, generating a switch signal that is transmitted to the contactor 7, causing the contactor 7 to close and control the output shaft of the electric push rod 502 to retract. Under the elastic force of the spring 402, the spring guide sleeve 301 drives the annular cutter 306 to move downward, cutting the diaphragm plate 203. Under the pressure, the flue gas leaks out from the cut diaphragm plate 203, thus releasing the flue gas pressure.

[0048] Example 2: The explosion-proof door is designed with a burst pressure of 10 kPaG and a diameter of DN500. The diaphragm plate 203 is made of 0.5 mm stainless steel. The upper gasket 202 and lower gasket 204 are asbestos gaskets that match the flange, and the sealing surface type is raised face (RF). The pressure switch 602 is set to a pressure of 10 kPaG. The rest is the same as in Example 1.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An explosion-proof door for precisely controlling pressure relief, characterized in that, include: The pressure relief cylinder (1) has one end port connected to the flue or equipment to be protected, and the other end port connected to the clamp (2). The clamp (2) has a diaphragm assembly configured as a destructible component during depressurization and covering and sealing the other end port of the depressurization cylinder (1); A cutting device (3) is positioned above the membrane assembly of the clamp (2); The spring device (4) is fixedly installed on the clamp (2), and the cutter device (3) is slidably installed on the spring device (4) so ​​that when pressure needs to be released, the spring device (4) drives the cutter device (3) to move downward to cut the diaphragm assembly; The push rod device (5) is fixedly installed on the clamp (2) and can be separated from the spring device (4) to limit and lock the spring device (4) under normal conditions, or to release the limit constraint on the spring device (4) under overpressure conditions. The pressure control device is connected to the pressure relief cylinder (1) and is signal-connected to the push rod device (5) to monitor the pressure inside the pressure relief cylinder (1) and output control signals to the push rod device (5).

2. The explosion-proof door for precisely controlling pressure relief according to claim 1, characterized in that, The clamp (2) includes: an upper flange (201), a diaphragm assembly, a lower flange (205), and flange bolts (206); the diaphragm assembly is assembled between the upper flange (201) and the lower flange (205), and the three are locked together by a number of flange bolts (206); the lower flange (205) is fixedly connected to the pressure relief cylinder (1).

3. The explosion-proof door for precisely controlling pressure relief according to claim 2, characterized in that, The diaphragm assembly includes an upper gasket (202), a lower gasket (204), and a diaphragm plate (203) sandwiched between the upper gasket (202) and the lower gasket (204); when the diaphragm plate (203) is made of a flexible material, the upper gasket (202) and the lower gasket (204) are omitted.

4. The explosion-proof door for precisely controlling pressure relief according to claim 2, characterized in that, The cutting device (3) includes an annular cutter (306), guide sleeve A (303), guide sleeve B (305), guide rod A (302), guide rod B (304), and spring guide sleeve (301); the outer diameter of the annular cutter (306) is smaller than the inner diameter of the pressure relief cylinder (1); guide rod A (302) and guide rod B (304) are respectively fixedly connected to the upper flange (201) of the clamp (2); guide sleeve A (303), guide sleeve B (305) and spring guide sleeve (301) are respectively fixedly connected to the upper part of the annular cutter (306) and distributed circumferentially; guide sleeve A (303) is correspondingly slidably sleeved on guide rod A (302); guide sleeve B (305) is correspondingly slidably sleeved on guide rod B (304); spring guide sleeve (301) is correspondingly slidably sleeved on spring device (4).

5. The explosion-proof door for precisely controlling pressure relief according to claim 4, characterized in that, The spring device (4) includes a spring rod (401), a spring (402), and a clamping bolt (403); the spring rod (401) is vertically and fixedly connected to the upper flange (201) of the clamp (2); the clamping bolt (403) is fitted on the top of the spring rod (401) and the two are threaded together; the spring guide sleeve (301) is slidably fitted on the spring rod (401); the spring (402) is fitted on the spring rod (401) and connected between the clamping bolt (403) and the spring guide sleeve (301).

6. The explosion-proof door for precisely controlling pressure relief according to claim 5, characterized in that, The push rod device (5) includes a push rod bracket (501) and a push rod (502); the lower end of the push rod bracket (501) is fixedly connected to the side wall of the upper flange (201) of the clamp (2), and the push rod (502) is fixedly installed on the top of the push rod bracket (501); the output shaft of the push rod (502) extends outward under normal conditions and is engaged with the lower edge of the spring guide sleeve (301) so that the spring (402) is compressed and contracted between the clamping bolt (403) and the spring guide sleeve (301); the output shaft of the push rod (502) retracts inward under overpressure conditions to release the engagement with the spring guide sleeve (301) so that the spring force of the spring (402) is released.

7. The explosion-proof door for precisely controlling pressure relief according to claim 6, characterized in that, The push rod (502) is an electric push rod or an electro-hydraulic push rod.

8. The explosion-proof door for precisely controlling pressure relief according to claim 7, characterized in that, The pressure control device includes a pressure measuring device (6) and a contactor (7). The pressure measuring device (6) includes a pressure guide tube (601) and a pressure switch (602). One end of the pressure guide tube (601) is connected to the pressure relief cylinder (1), and the other end is connected to the pressure switch (602). The on / off signal of the pressure switch (602) is connected to the contactor (7), and the contactor (7) is connected to the push rod (502) to control the action of the push rod (502).

9. The explosion-proof door for precisely controlling pressure relief according to claim 4, characterized in that, The lower edge of the annular cutter (306) is serrated.

10. An explosion-proof door for precisely controlling pressure relief according to claim 4 or 9, characterized in that, The annular cutter (306) has a C-shaped structure with a notch.

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