Explosion-proof floor drain and air tightness detection method thereof

Abstract

The invention relates to the technical field of anti-explosion floor drains of civil air defense engineering, in particular to an anti-explosion floor drain and an air tightness detection method thereof.The anti-explosion floor drain comprises a drain body, a through hole is formed in the inner wall of the drain body, a containing box is arranged on the outer side wall of the drain body, the through hole is communicated with an inner cavity of the containing box, and a flange is arranged on the edge of an upper cover; the floor drain further comprises a driver and a supporting plate, and the supporting plate is suitable for being partially or completely located in the floor drain body to support the flange in a normal state and is suitable for being driven by the driver to enter the containing box through the through hole to be separated from the flange in a wartime state. The permanent magnet is fixed in the drain body and below the flange and is used for magnetically attracting the flange to enable the sealing gasket to press the pipe orifice; the power supply, the movable contact piece and the fixed contact piece are connected with the driver in series to form a loop, and the movable contact piece is suitable for moving to be in contact with the fixed contact piece when encountering shock waves. When blast waves rush to the anti-explosion floor drain through a pipeline, the anti-explosion floor drain automatically senses and triggers functions through a stable mechanical structure, so that an upper cover of the anti-explosion floor drain automatically sinks, and the anti-explosion floor drain is switched to a wartime state.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof floor drains in civil air defense projects, and in particular to an explosion-proof floor drain and an air tightness detection method thereof. Background Art

[0002] "Civil defense projects" are people's air defense projects, also called civil defense fortifications. They refer to underground protective buildings built separately to ensure the shelter of personnel and materials, civil air defense command, and medical rescue during wartime, as well as basements built in combination with ground buildings that can be used for air defense during wartime.

[0003] When arranging the contaminated water pool in the civil air defense project, an explosion-proof floor drain must be installed in each functional room, and then a sump must be set up outside the civil air defense area. The explosion-proof floor drain is connected to the sump to collect sewage for flushing the contaminated rooms after the war.

[0004] The explosion-proof floor drain in the prior art is usually in an open state, at which time the upper cover is at a high position, and the sealing gasket at the bottom of the upper cover is located a certain distance above the pipe mouth, so that the floor drain can drain water normally; in wartime, the upper cover is lowered and locked, so that the sealing gasket is pressed against the pipe mouth to prevent the shock wave and poisonous gas from entering the protection area. However, the upper cover needs to be manually removed and reinstalled to a lower position, and rotated and locked, which cannot cope with sudden war situations. Therefore, this explosion-proof floor drain has limitations. There is an urgent need for an explosion-proof floor drain that can automatically switch to a wartime state when a shock wave rebounds from the pipeline to the explosion-proof floor drain. Summary of the invention

[0005] In view of this, the present invention provides an explosion-proof floor drain, which is intended to realize the function of automatically switching to a wartime state when a shock wave rebounds from a pipeline toward the explosion-proof floor drain.

[0006] In order to solve the above problems, the explosion-proof floor drain provided by the present invention includes a drain body, a water leakage opening is arranged on the top of the drain body, and an interface for a pipeline is arranged on the bottom. An upper cover, a lower cover, and a sealing gasket fixed as one body are arranged in sequence from top to bottom inside the drain body, and the sealing gasket is located directly above the pipe mouth of the pipeline; at least two through holes are evenly arranged on the inner wall of the drain body along the circumferential direction, and a receiving box is arranged on the outer wall of the drain body, and the through hole is connected to the inner cavity of the receiving box, and a flange corresponding to the through hole is arranged on the edge of the upper cover; and a driver and a support plate are also included, and the support plate is suitable for being partially or completely located on the drain body in normal state. The flange is supported inside the drain box, and is suitable for being driven by the driver in a wartime state to enter the containing box through the through hole and separate from the flange; it also includes a permanent magnet, fixed inside the drain body and below the flange, for magnetically attracting the flange to make the sealing gasket press the pipe mouth; it also includes a power supply, a moving contact piece and a fixed contact piece, the fixed contact piece, the moving contact piece, the power supply and the driver are connected in series to form a loop, the fixed contact piece cooperates with the moving contact piece to form a switch of the loop, the moving contact piece is hinged to the pipeline, and the moving contact piece is suitable for moving to contact with the fixed contact piece when it is recoiled by the shock wave in the pipeline.

[0007] Optionally, the driver is a pneumatic actuator or an electric actuator.

[0008] Optionally, the driver includes an electromagnet and a second permanent magnet, the electromagnet including a cylindrical iron core and a coil wound on the iron core, the coil being connected in series in the circuit, the central axis of the iron core being perpendicular to the central axis of the upper cover, a limiting hole being provided on the support plate, one end of the iron core being fixed in the containing box, and the other end being slidably inserted into the limiting hole, the second permanent magnet being fixed on the support plate, and the magnetic pole direction of the second permanent magnet being the same as the magnetic pole direction of the electromagnet at the initial stage of power-on.

[0009] Optionally, a commutator is also included, which is connected in series in the circuit and is used to periodically change the direction of the current in the circuit. It is suitable for causing the electromagnet to repel the second permanent magnet when the flange contacts the permanent magnet, so that the support plate extends into the drain body to block the flange from moving upward.

[0010] Optionally, the through hole is a strip-shaped hole with a horizontal bottom wall, and the length direction of the strip-shaped hole is the circumference of the drain body, and the bottom wall of the strip-shaped hole is flush with the upper surface of the flange at the lowest position.

[0011] Optionally, a guide slope is provided at the place where the support plate and the flange initially meet when moving.

[0012] Optionally, guard plates are symmetrically provided on both sides of the through hole, and the flange in peacetime and wartime states is located between a pair of the guard plates.

[0013] Optionally, a mounting groove is provided at the center of the lower surface of the upper cover, a mounting column and the power supply are arranged in the mounting groove, a pressure pad is provided on the side of the sealing gasket facing the pipe mouth, screws are passed through the center of the pressure pad and the sealing gasket, and the screws pass through the lower cover to connect the mounting column.

[0014] Optionally, a threading hole is provided in the screw, and a wire connecting the fixed contact piece and the movable contact piece enters the installation slot through the threading hole to be connected to the power supply.

[0015] Another object of the present invention is to provide a method for detecting air tightness of an explosion-proof floor drain, comprising providing the above-mentioned explosion-proof floor drain, and the detection steps are as follows: The first step is to use a smoke generator to generate smoke in the pipe when the explosion-proof floor drain is in a wartime state; The second step is to connect the air pump to the end of the pipe away from the explosion-proof floor drain; The third step is to install a circle of filter membrane near the pipe opening in the explosion-proof floor drain; Step 4: Start the air pump to pressurize the pipeline to the specified pressure. After a certain period of time, remove the filter membrane and weigh it; The fifth step is to calculate the mass concentration of captured smoke particles by using the mass difference before and after filter membrane sampling.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages: 1. When the shock wave of the explosion rushes towards the explosion-proof floor drain through the pipeline, the explosion-proof floor drain automatically senses and triggers the function through the stable mechanical structure, so that the upper cover of the explosion-proof floor drain immediately sinks automatically and quickly switches to the wartime state.

[0017] 2. Not only can the upper cover be locked for the first time after sinking by magnetic adsorption, but the direction of the current in the circuit can also be changed by the delayed-triggered commutator, so that the support plate is pushed back to the top of the flange of the upper cover, thereby achieving the second locking of the upper cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a three-dimensional diagram of the explosion-proof floor drain in the embodiment.

[0020] Figure 2 4 is a top view of the explosion-proof floor drain in the embodiment.

[0021] Figure 3 yes Figure 2 AA direction cross-sectional view.

[0022] Figure 4 It is a schematic diagram of the structure arranged on the leakage body in the embodiment.

[0023] Figure 5 yes Figure 3 Enlarged view of part A in the middle.

[0024] Figure 6 3 is a diagram showing the positional relationship among the support plate, flange and permanent magnet in the wartime state in the embodiment.

[0025] In the figure: leak body 1, through hole 11, upper cover 2, flange 21, mounting groove 22, mounting column 23, lower cover 3, sealing gasket 4, accommodating box 5, supporting plate 6, limiting hole 61, guide slope 62, guard plate 7, permanent magnet 8, moving contact piece 9, fixed contact piece 10, electromagnet 111, second permanent magnet 112, pressure pad 12, screw 13, filter membrane 14, pipeline 15. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0030] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0031] Example 1 Please refer to Figure 1-Figure 3 The present invention provides an explosion-proof floor drain, comprising a drain body 1, an upper cover 2, a lower cover 3, a sealing gasket 4, a driver, a support plate 6, a permanent magnet 8, a power supply, a moving contact piece 9, a fixed contact piece 10 and a containing box 5; wherein the drain body 1 is equivalent to the shell of the explosion-proof floor drain, and is in the shape of a bowl with an open bottom, the top bowl mouth is used as an opening for leaking water to enter, and the opening in the center of the bottom is used as an interface for a pipe 15; the containing box 5 is fixed on the outer wall of the drain body 1, and the number is at least two, preferably three, and is evenly distributed along the circumference of the outer wall of the drain body 1; the upper cover 2, the lower cover 3 and the sealing gasket 4 are connected as a whole by a connecting piece, and the connecting piece can be a screw 13 or a glue, and the upper cover 2, the lower cover 3 and the sealing gasket 4 are sequentially arranged in the drain body 1 from top to bottom, wherein the sealing gasket 4 is located directly above the pipe mouth of the pipe 15, and the diameter of the sealing gasket 4 is larger than the outer diameter of the pipe mouth. When the upper cover 2 and the lower cover 3 sink as a whole, the sealing gasket 4 can completely cover and press on the pipe mouth.

[0032] Please refer to Figure 2 The upper cover 2 has multiple holes for water leakage. The diameter of the upper cover 2 is also smaller than the inner diameter of the top opening of the leakage body 1. There is an annular gap between the edge of the upper cover 2 and the inner wall of the leakage body 1. The annular gap is also for water leakage. The annular gap is divided into multiple arc gaps by the support plate 6 in the normal state (i.e., non-wartime state).

[0033] Please refer to Figure 4 and Figure 5 At least two through holes 11 are evenly arranged on the inner wall of the leakage body 1 along the circumferential direction. The positions and number of the through holes 11 correspond to the containing box 5, and each through hole 11 directly passes through the inner cavity of a containing box 5; the position and number of the support plate 6 correspond to the through holes 11, and the support plate 6 can be moved to multiple positions, but always moves in a certain diameter direction of the upper cover 2, and must move outward through the through holes 11 until it is partially or completely located in the containing box 5, or move inward through the through holes 11 until it is partially or completely located in the leakage body 1.

[0034] Please refer to Figure 2 and Figure 4 A plurality of flanges 21 are integrally formed on the side of the upper cover 2 , and the positions and numbers of the flanges 21 correspond to the through holes 11 .

[0035] Please refer to Figure 4 and Figure 5The upper permanent magnet 8 is fixed on the inner side wall or the inner bottom wall of the leakage body 1 and is located directly below the flange 21; the driver is preferably arranged in the accommodating box 5, and an automatically-actuated pneumatic actuator (such as a cylinder equipped with a miniature compressed gas tank) or an electric actuator (such as an electric cylinder) can be used.

[0036] Please refer to Figure 5 In normal state, the support plate 6 is partially or completely located in the leak body 1 and supports the flange 21, so that the upper cover 2 is in a higher position, and there is a gap between the sealing gasket 4 and the pipe mouth for water leakage (such as Figure 3 As shown), the explosion-proof floor drain can leak water normally at this time; in the wartime state, the driver drives the support plate 6 to enter the containing box 5 through the through hole 11 and separate from the flange 21. At this time, the upper cover 2 sinks under the action of gravity, and the permanent magnet 8 quickly absorbs the flange 21, so that the sealing gasket 4 can press the pipe mouth. The flange 21 is generally made of ferromagnetic material. If the flange 21 is a non-ferromagnetic material, another magnet with the same magnetic pole direction as the permanent magnet 8 is embedded on the lower surface of the flange 21 for mutual attraction.

[0037] The power source is a small power source, such as a small lithium battery, which is hidden in a water-proof place in the leakage body 1, or a protective box is separately set on the outer wall of the leakage body 1 to place the power source. The fixed contact piece 10, the moving contact piece 9, the power source and the driver are connected in series through wires to form a loop. If the wires encounter obstacles, holes are drilled to pass the wires, and then sealant is filled in the holes.

[0038] Please refer to Figure 3 The fixed contact piece 10 cooperates with the moving contact piece 9 to form a switch of the circuit. In normal state, the switch is normally open. In wartime, the switch will be closed under the influence of the explosion shock wave. The specific action is that the moving contact piece 9 moves toward the fixed contact piece 10, and the switch is closed after the two contact. The position of the fixed contact piece 10 is fixed, preferably fixed at the pipe mouth; the moving contact piece 9 is movable, preferably hinged at the pipe mouth, and is located below the fixed contact piece 10. The moving contact piece 9 will be lifted up and contact the fixed contact piece 10 under the influence of the shock wave.

[0039] Please refer to Figure 5 Preferably, the driver adopts an electromagnet 111 and a second permanent magnet 112, wherein the electromagnet 111 includes an iron core and a coil, the iron core is cylindrical, the coil is wound around the iron core and connected in series to the circuit; the central axis of the iron core is perpendicular to the central axis of the upper cover 2, a limiting hole 61 is provided on the support plate 6, one end of the iron core is fixed in the containing box 5, and the other end of the iron core is inserted into the limiting hole 61 in a sliding manner; the second permanent magnet 112 is fixed on the support plate 6, and the magnetic pole direction of the second permanent magnet 112 is the same as the magnetic pole direction of the electromagnet 111 at the initial stage of power-on, and the two attract each other.

[0040] When the shock wave of the explosion rushes toward the explosion-proof floor drain through the pipe 15, the explosion-proof floor drain automatically senses the circuit through a stable mechanical structure (a combination of the moving contact piece 9 and the fixed contact piece 10), and the electromagnet 111 in the circuit is energized. The electromagnet 111 attracts the second permanent magnet 112 on the support plate 6 to make the support plate 6 enter the receiving box 5 and release the flange 21, causing the flange 21 to fall and be attracted by the permanent magnet 8, that is, the upper cover 2 sinks, and the explosion-proof floor drain switches to a wartime state.

[0041] Furthermore, a commutator can be connected in series in the circuit, and the commutator has the function of periodically changing the direction of the current in the circuit. For example, the preset program is to switch the direction of the current in the circuit after the circuit is closed for 1 second. At this time, the magnetic pole direction of the electromagnet 111 changes, and the electromagnet 111 becomes to repel the second permanent magnet 112. The support plate 6 is partially pushed into the leakage body 1 under the repulsive force. At this time, the flange 21 is located below the support plate 6; when the flange 21 is attracted by the permanent magnet 8, it is best for the upper surface of the flange 21 to be flush with the lower surface of the support plate 6, which can prevent the flange 21 from moving upward and avoid the shock wave from breaking the sealing gasket 4 at the pipe mouth and causing leakage.

[0042] It should be noted that the support plate 6 can be completely moved out of the containing box 5, but cannot be completely entered into the leakage body 1, so as to prevent the support plate 6 from slipping out of the through hole 11 and falling into the leakage body 1. Therefore, a part of the support plate 6 needs to be left in the through hole 11 when entering the leakage body 1. If the repulsive force range of the electromagnet 111 is too large, resulting in the risk of the support plate 6 slipping out of the through hole 11 and falling into the leakage body 1, a limit structure for the moving range of the support plate 6 should be provided, which is a conventional technical means and will not be described in detail in this embodiment.

[0043] Preferably, in order to allow the support plate 6 to pass through the through hole 11 flexibly, the through hole 11 is designed to be a strip hole with a horizontal bottom wall, and the length direction of the strip hole is the circumference of the leak body 1, and the bottom wall of the strip hole is flush with the upper surface of the flange 21 in the lowest position (i.e., in the wartime state).

[0044] Please refer to Figure 6 Furthermore, additional pressure can be applied to the flange 21 in the wartime state through the support plate 6, so that the sealing gaskets 4 are further compressed. By setting a guide slope 62 at the initial contact point between the support plate 6 and the flange 21 when they move, and setting the bottom wall position of the through hole 11 to be 0-1 mm lower than the upper surface of the flange 21 at the lowest position, when the support plate 6 enters the leak body 1 under the action of the repulsive force, the upper surface of the flange 21 is squeezed by the guide slope 62, and smoothly moves to the top of the flange 21, thereby achieving compression of the flange 21.

[0045] Please refer to Figure 4 Furthermore, guard plates 7 are symmetrically arranged on both sides of the through hole 11, the guard plates 7 are straight plates, the facing surfaces of the two guard plates 7 are vertical, and the flange 21 between the two guard plates 7 is not affected by the guard plates 7 when rising or falling; the flange 21 in peacetime and wartime states is located between a pair of guard plates 7.

[0046] Please refer to Figure 3 Specifically, a cylindrical portion protrudes from the center of the lower surface of the upper cover 2. The portion is hollow and has an opening at the bottom, forming a mounting groove 22 in which the power supply is fixed; a mounting column 23 is protruded from the center of the mounting groove 22, and a threaded hole is provided at the downward end of the mounting column 23. A pressure pad 12 is laid on the side of the sealing gasket 4 facing the pipe opening, and a screw 13 is passed through the center of the pressure pad 12 and the sealing gasket 4. The screw 13 passes through the lower cover 3 and is connected to the threaded hole of the mounting column 23. The function of the pressure pad 12 is to press the sealing gasket 4 against the lower surface of the lower cover 3 and disperse the pressure of the screw 13 on the center of the sealing gasket 4.

[0047] In order to facilitate the insertion of wires, a thicker screw 13 can be selected, and a wire hole can be drilled axially at the nut of the screw 13, and the wire connecting the fixed contact piece 10 and the movable contact piece 9 can be passed through the wire hole into the installation groove 22 to connect to the power supply.

[0048] In summary, compared with the prior art, the technical solution of the present invention has the following advantages: when the shock wave of the explosion rushes towards the explosion-proof floor drain through the pipe 15, the explosion-proof floor drain automatically senses and triggers the function through a stable mechanical structure, so that the upper cover 2 of the explosion-proof floor drain immediately sinks automatically and quickly switches to a wartime state; not only can the upper cover 2 after sinking be locked for the first time by magnetic adsorption, but the direction of the current in the circuit can also be changed through a delayed-triggered commutator, so that the support plate 6 is pushed back to the top of the flange 21 of the upper cover 2, thereby realizing the second locking of the upper cover 2.

[0049] In addition, this embodiment also relates to a method for detecting air tightness of an explosion-proof floor drain. The above-mentioned explosion-proof floor drain is provided, and the detection steps are as follows: The first step is to generate smoke in the pipe 15 using a smoke generator when the explosion-proof floor drain is in a wartime state; The second step is to connect an air pump to the end of the pipe 15 away from the explosion-proof floor drain; The third step is to clean the inner wall of the explosion-proof floor drain and set a circle of filter membrane 14 near the pipe mouth in the explosion-proof floor drain, such as Figure 3 A filter membrane 14 is provided at the middle dotted line; Step 4: Start the air pump to pressurize the pipe 15 to a specified pressure, and after a certain period of time, remove the filter membrane 14 and weigh it; The fifth step is to calculate the mass concentration of the captured smoke particles by using the mass difference before and after the sampling of the filter membrane 14.

[0050] The above detection method simulates the shock wave by increasing the air pressure, and samples by weighing the filter membrane 14, so that the smoke particles leaked from the explosion-proof floor drain are captured on the high-performance filter membrane 14, and then the mass difference before and after sampling of the filter membrane 14 is weighed to calculate the mass concentration of the smoke particles. By stipulating the mass concentration range of smoke particles that the filter membrane 14 is allowed to detect under different shock wave pressures, it is determined whether the explosion-proof floor drain is airtight or not.

[0051] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An explosion-proof floor drain, characterized in that: It comprises a leaking body, wherein the leaking body is provided with an opening for leaking water at the top and an interface for a pipeline at the bottom, wherein the leaking body is provided with an upper cover, a lower cover and a sealing gasket fixed as one body from top to bottom in sequence, and the sealing gasket is located directly above the pipe opening of the pipeline; The inner wall of the drain body is evenly provided with at least two through holes along the circumferential direction, the outer wall of the drain body is provided with a receiving box, the through holes are connected to the inner cavity of the receiving box, and the edge of the upper cover is provided with a flange corresponding to the through holes; It also includes a driver and a support plate, wherein the support plate is adapted to be partially or completely located in the drain body to support the flange in a normal state, and adapted to be driven by the driver to pass through the through hole into the containing box and separate from the flange in a wartime state; It also includes a permanent magnet, which is fixed inside the drain body and below the flange, and is used to magnetically attract the flange so that the sealing gasket presses the pipe opening tightly; It also includes a power supply, a moving contact piece and a fixed contact piece. The fixed contact piece, the moving contact piece, the power supply and the driver are connected in series to form a loop. The fixed contact piece cooperates with the moving contact piece to form a switch of the loop. The moving contact piece is hinged to the pipeline, and the moving contact piece is suitable for moving to contact with the fixed contact piece when it is recoiled by the shock wave in the pipeline.

2. The explosion-proof floor drain according to claim 1, characterized in that: The driver is a pneumatic actuator or an electric actuator.

3. The explosion-proof floor drain according to claim 1, characterized in that: The driver includes an electromagnet and a second permanent magnet, the electromagnet includes a cylindrical iron core and a coil wound on the iron core, the coil is connected in series in the circuit, the central axis of the iron core is perpendicular to the central axis of the upper cover, a limiting hole is provided on the support plate, one end of the iron core is fixed in the containing box, and the other end is inserted into the limiting hole in a sliding manner, the second permanent magnet is fixed on the support plate, and the magnetic pole direction of the second permanent magnet is the same as the magnetic pole direction of the electromagnet at the initial stage of power-on.

4. The explosion-proof floor drain according to claim 3, characterized in that: It also includes a commutator, which is connected in series in the circuit and is used to periodically change the direction of the current in the circuit. It is suitable for causing the electromagnet to repel the second permanent magnet when the flange contacts the permanent magnet, so that the support plate extends into the drain body to block the flange from moving upward.

5. The explosion-proof floor drain according to claim 4, characterized in that: The through hole is a strip-shaped hole with a horizontal bottom wall, and the length direction of the strip-shaped hole is the circumference of the drain body, and the bottom wall of the strip-shaped hole is flush with the upper surface of the flange at the lowest position.

6. The explosion-proof floor drain according to claim 5, characterized in that: A guide slope is provided at the initial contact point between the support plate and the flange when the support plate and the flange move.

7. The explosion-proof floor drain according to claim 1, characterized in that: Guard plates are symmetrically arranged on both sides of the through hole, and the flange in both the peacetime state and the wartime state is located between a pair of the guard plates.

8. The explosion-proof floor drain according to claim 1, characterized in that: A mounting groove is provided at the center of the lower surface of the upper cover, a mounting column and the power supply are arranged in the mounting groove, a pressure pad is provided on the side of the sealing gasket facing the pipe mouth, screws are passed through the center of the pressure pad and the sealing gasket, and the screws pass through the lower cover to connect the mounting column.

9. The explosion-proof floor drain according to claim 8, characterized in that: A threading hole is provided in the screw, and the wire connecting the fixed contact piece and the movable contact piece enters the installation groove through the threading hole to connect to the power supply.

10. A method for detecting air tightness of explosion-proof floor leaks, characterized in that: The method comprises providing an explosion-proof floor drain as claimed in any one of claims 1 to 9, wherein the detection steps are as follows: The first step is to use a smoke generator to generate smoke in the pipe when the explosion-proof floor drain is in a wartime state; The second step is to connect the air pump to the end of the pipe away from the explosion-proof floor drain; The third step is to install a circle of filter membrane near the pipe opening in the explosion-proof floor drain; Step 4: Start the air pump to pressurize the pipeline to the specified pressure. After a certain period of time, remove the filter membrane and weigh it; The fifth step is to calculate the mass concentration of captured smoke particles by using the mass difference before and after filter membrane sampling.

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