Anti-explosion floor drain for civil air defense engineering

Abstract

The utility model relates to the technical field of anti-explosion floor drains, in particular to an anti-explosion floor drain for civil air defense engineering, which comprises a floor drain shell and a drain core, a valve cavity is formed on the floor drain shell, and a clamping structure for clamping and fixing the drain core is arranged in the valve cavity. The leakage core comprises an inner cover body used for blocking the channel in the valve cavity and a rotating body rotationally connected to the inner cover body, a sealing structure used for sealing the channel in the valve cavity is arranged on the inner cover body, and a positioning structure used for preventing the inner cover body from being separated from the rotating body is arranged on the rotating body. When the explosion-proof floor drain is used, the inner cover body and the rotating body are matched for use, so that the purpose of conveniently controlling opening or closing can be achieved on the premise of ensuring normal use of the explosion-proof floor drain, and the explosion-proof floor drain is more convenient to use.

Description

Technical Field

[0001] The present application relates to the technical field of explosion-proof floor drains, and in particular to an explosion-proof floor drain for civil air defense projects. Background Art

[0002] The explosion-proof floor drain is used in the inner end of the protection zone of the drainage network in the civil defense area. When it is sealed, it can prevent the explosion shock wave and other toxic gases from entering the protection body through the pipeline, playing a safety protection role. During wartime, when the area is contaminated and needs to be cleaned, the explosion-proof floor drain will be opened to drain the water and flush it.

[0003] The existing explosion-proof floor drain structure usually includes a floor drain shell and a leakage core arranged in the floor drain shell. A valve cavity is formed in the floor drain shell, and the leakage core is used to block the channel in the valve cavity. When in use, the staff carries the leakage core, places the leakage core in the valve cavity, and rotates the leakage core clockwise about 60 degrees to achieve complete sealing and locking of the explosion-proof floor drain. Conversely, the leakage core can be withdrawn by rotating it counterclockwise 60 degrees, and the explosion-proof floor drain can be opened.

[0004] However, when the above explosion-proof floor drain is actually used, it is necessary to manually lift the drain core and rotate it at a specified angle to open it. However, due to the large weight of the drain core and the friction of the inner wall of the valve cavity on the drain core, the drain core is more laborious to rotate and is more inconvenient to use. Utility Model Content

[0005] In order to solve the problem that the existing leakage core is relatively laborious during rotation, resulting in inconvenience in using the overall explosion-proof floor drain, the present application provides an explosion-proof floor drain for civil air defense projects.

[0006] This application provides an explosion-proof floor drain for civil air defense projects, which adopts the following technical solutions:

[0007] An explosion-proof floor drain for civil air defense projects includes a floor drain shell and a drain core. A valve cavity is formed on the floor drain shell, and a clamping structure for clamping and fixing the drain core is provided in the valve cavity. The drain core includes an inner cover body for blocking the channel in the valve cavity, and a rotating body rotatably connected to the inner cover body. The inner cover body is provided with a sealing structure for sealing the channel in the valve cavity, and the rotating body is provided with a positioning structure for preventing the inner cover body from separating from the rotating body.

[0008] By adopting the above technical solution, when in use, the leakage core is placed as a whole on the channel in the valve cavity, and the inner cover body is supported by the channel in the valve cavity. After that, the staff only needs to rotate the rotating body to fix the leakage core as a whole in the valve cavity through the clamping structure. At this time, the sealing of the channel in the valve cavity can be achieved through the sealing structure. Compared with the existing technology that requires the staff to carry the leakage core and rotate it at the same time, it is more convenient and labor-saving to use, and it also ensures that the use effect of the explosion-proof floor drain is not affected.

[0009] Preferably, the clamping structure includes several limit blocks fixed on the inner wall of the valve cavity, and several of the limit blocks are arranged rotationally symmetrically about the axis core of the valve cavity. Several abutment blocks are fixed on the rotating body, and several of the abutment blocks are arranged in a one-to-one correspondence with the limit blocks, and the abutment blocks are in abutment with the limit blocks. A first guide bevel is provided on the limit block, and a second guide bevel is provided on the abutment block. The first guide bevel and the second guide bevel are arranged in cooperation with each other, and the limit block is also provided with an embedding groove for embedding the abutment block.

[0010] By adopting the above technical solution, when in use, by rotating the rotating body, the abutment block is guided to the bottom of the limit block under the cooperation of the first guide bevel and the second guide bevel, so that the abutment block is tightened by the limit block, thereby ensuring the sealing effect of the sealing structure, and then achieving the overall clamping and fixing of the leakage core on the channel in the valve cavity.

[0011] Preferably, the sealing structure includes a first sealing gasket provided on the inner cover body, a snap-fit ​​groove is provided on the inner cover body, and the first sealing gasket is snap-fitted and embedded in the snap-fit ​​groove.

[0012] By adopting the above technical solution, when in use, the first sealing gasket is clamped and fixed to the inner cover body through the clamping groove, so that in the process of the limit block pressing down the abutment block, the inner cover body is buckled at the opening of the channel in the valve cavity, and then the connecting gap between the inner cover body and the channel in the valve cavity is sealed by the first sealing gasket, thereby ensuring the sealing effect of the leaking core blocking the channel in the valve cavity.

[0013] Preferably, the sealing structure includes a second sealing gasket fixed on the inner cover body, and a sealing groove is formed on the second sealing gasket, and the sealing groove is embedded in the end of the channel in the valve cavity.

[0014] By adopting the above technical solution, when in use, the abutment block is pressed down by the limit block, so that the open end of the channel in the valve cavity is embedded in the sealing groove, and the second sealing gasket covers the channel in the valve cavity to achieve sealing of the channel in the valve cavity, and the overall sealing effect is better.

[0015] Preferably, the positioning structure includes a limiting bolt threadedly connected to the rotating body and a pin passed through the rotating body. A first connecting column is fixed to the end of the inner cover body away from the sealing structure. A first mounting groove is provided on the rotating body. The first connecting column rotates in the first mounting groove. A first annular groove is provided on the side wall of the first connecting column. The end of the pin away from the limiting bolt passes through the rotating body and is inserted into the first annular groove. One end of the limiting bolt is in abutment with the pin.

[0016] By adopting the above technical solution, when in use, first insert the first connecting column into the first mounting groove, then pass the pin through the rotating body, and screw the limiting bolt so that the end of the limiting bolt abuts the pin, so that one end of the pin passes through the rotating body and is inserted into the first annular groove, thereby achieving the purpose of preventing the inner cover body and the rotating body from separating from each other while ensuring that the rotating body is rotatably connected to the inner cover body.

[0017] Preferably, the positioning structure includes a pin slidably arranged on the rotating body and a return spring sleeved on the pin, a second connecting column is fixed to the end of the inner cover body away from the sealing structure, a second mounting groove is provided on the rotating body, the second connecting column rotates in the second mounting groove, a second annular groove is provided on the side wall of the second connecting column, one end of the pin passes through the rotating body and is plugged into the second annular groove, one end of the return spring abuts on the pin, and the other end of the return spring abuts on the outer wall of the rotating body, and a limiting structure for preventing the pin from disengaging from the second annular groove is provided on the rotating body.

[0018] By adopting the above technical solution, when in use, after the second connecting column is inserted into the second mounting groove, the end of the pin can be passed through the rotating body and inserted into the second annular groove, thereby ensuring that the rotating body rotates on the inner cover body. At the same time, the limiting structure is used to ensure that the rotating body is separated from the inner cover body, thereby ensuring the convenience of using the leakage core.

[0019] Preferably, the limiting structure includes a limiting sleeve arranged on the rotating body, one end of the limiting sleeve is threadedly connected to the rotating body, the inner wall of the other end of the limiting sleeve is flared, and the end of the pin away from the second ring groove forms an abutment end, and the abutment end abuts and cooperates with the inclined surface of the inner wall of the limiting sleeve.

[0020] By adopting the above technical solution, when in use, the limit sleeve is screwed to gradually move downward along the axial direction of the rotating body, so that the inner wall of the limit sleeve is abutted against the abutting end of the latch, so that the latch is inserted into the second ring groove. At this time, the reset spring is in a compressed state. When the rotating body and the inner cover body need to be disassembled, it is only necessary to screw the limit sleeve in the opposite direction to move the limit sleeve assembly upward. Then, under the action of the reset spring force, the latch is disengaged from the second ring groove, thereby achieving the purpose of disassembling the rotating body and the inner cover body.

[0021] Preferably, the floor drain shell includes an upper shell and a lower shell, the upper shell is fixed with a plug-in block at one end facing the lower shell, the lower shell is provided with a plug-in slot at one end facing the upper shell, the plug-in block is plugged into the plug-in slot, and the snap-in structure is arranged on the upper shell.

[0022] By adopting the above technical solution, when in use, the floor drain shell is divided into an upper shell and a lower shell and processed separately, and then the upper shell and the lower shell are re-merged into the floor drain shell through the cooperation of the plug-in block and the plug-in slot, thereby making the shape processing of the floor drain shell more convenient and effectively reducing the processing cost of the floor drain shell.

[0023] Preferably, a weight-reducing hole is provided on the rotating body, and the weight-reducing hole is communicated with the valve cavity.

[0024] By adopting the above technical solution, when in use, the setting of the weight-reducing hole makes it easier for the staff to carry the leakage core, and on the other hand, the processing cost of the leakage core is reduced.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Through the coordinated use of the clamping structure, positioning structure and sealing structure, the channel in the valve cavity is sealed while ensuring the rotational coordination between the rotating body and the inner cover body, making it more convenient and labor-saving for workers to operate when closing the explosion-proof floor drain;

[0027] 2. By opening a sealing groove on the second sealing gasket, the sealing effect of the second sealing gasket on the channel in the valve cavity is ensured, thereby ensuring the performance of the explosion-proof floor drain;

[0028] 3. The inner wall of the limiting sleeve limits the position of the latch pin, and the elastic force of the reset spring is used to realize the detachable connection between the rotating body and the inner cover body, making the installation process simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an axonometric diagram mainly showing the overall structure in Example 1 of the present application;

[0030] Figure 2 This is a cross-sectional view mainly showing the overall structure of Example 1 of the present application;

[0031] Figure 3 This is an exploded view of the overall structure of Example 1 of the present application;

[0032] Figure 4 This is a cross-sectional view mainly showing the overall structure of the second embodiment of the present application;

[0033] Figure 5 This is a cross-sectional view mainly showing the overall structure of Example 3 of the present application;

[0034] Figure 6 It is an exploded diagram mainly showing the leaky core structure in Example 3 of the present application.

[0035] 1. Floor drain outer shell; 11. Upper shell; 12. Lower shell; 13. Connecting block; 14. Connecting slot; 2. Drain core; 21. Inner cover; 211. Connecting slot; 212. First connecting column; 213. Second connecting column; 214. First annular groove; 22. Rotating body; 221. First mounting groove; 222. Second mounting groove; 223. Second annular groove; 224. First handle; 23. Abutting block; 24. Second guide slope; 3. Connecting structure; 31. Limiting block; 32. First guide slope; 33. Embedded groove; 4. Sealing structure; 41. First sealing gasket; 42. Second sealing gasket; 43. Sealing slot; 5. Positioning structure; 51. Limiting bolt; 52. Pin; 53. Latch; 54. Reset spring; 6. Limiting structure; 61. Limiting sleeve; 7. Weight reduction hole; 8. Second handle; 9. Hexagonal bolt slot. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 6 This application is described in further detail.

[0037] The embodiments of the present application disclose an explosion-proof floor drain for civil air defense projects.

[0038] Example 1:

[0039] Reference Figure 1 and Figure 2 A explosion-proof floor drain for civil air defense projects includes a horizontally arranged floor drain shell 1 and a drain core 2, wherein a valve cavity is integrally formed in the floor drain shell 1, and an inner channel is formed in the valve cavity. In this embodiment, the floor drain shell 1 is composed of an upper shell 11 and a lower shell 12, wherein a plug-in block 13 is integrally formed at the bottom end of the upper shell 11, and a plug-in groove 14 is integrally formed at the top end of the lower shell 12.

[0040] Reference Figure 2 and Figure 3 In actual processing, since there are many structures in the valve cavity, in order to reduce the difficulty and cost of processing the floor drain shell 1, this application mainly adopts a split processing method, that is, the upper shell 11 and the lower shell 12 are processed separately, and then the plug-in block 13 is embedded in the plug-in groove 14 to achieve the preliminary assembly of the upper shell 11 and the lower shell 12, and then the upper shell 11 is fixed to the lower shell 12 by welding, thereby realizing the production of the floor drain shell 1.

[0041] Reference Figure 2 and Figure 3The leakage core 2 is composed of an inner cover body 21 and a rotating body 22, wherein the inner cover body 21 is located directly below the rotating body 22, and a first connecting column 212 is integrally formed at the top end of the inner cover body 21, and a first mounting groove 221 is integrally formed at the bottom end of the rotating body 22. The first connecting column 212 is inserted into the first mounting groove 221, and the first connecting column 212 rotates in the first mounting groove 221, and a positioning structure 5 is provided on the rotating body 22; when in use, by providing the positioning structure 5, it is ensured that the rotating body 22 and the inner cover body 21 will not separate from each other during the rotation of the rotating body 22 on the inner cover body 21, thereby ensuring the normal use of the leakage core 2.

[0042] Reference Figure 2 and Figure 3 The positioning structure 5 is composed of a limiting bolt 51 and a pin 52. There are several limiting bolts 51, and the limiting bolts 51 are evenly spaced along the circumference of the first connecting column 212. There are also several pins 52, and the pins 52 are arranged one by one corresponding to the limiting bolts 51. A first annular groove 214 is opened on the side wall of the first connecting column 212. The axis of the first annular groove 214 coincides with the axis of the first connecting column 212. One end of the pin 52 passes through the rotating body 22 and is inserted into the first annular groove 214. The limiting bolt 51 is located on the outside of the pin 52. In this embodiment, there are two limiting bolts 51. The limiting bolt 51 is preferably set as a headless screw, and the limiting bolt 51 is threadedly connected to the rotating body 22, and the end of the limiting bolt 51 abuts against the end of the pin 52.

[0043] Reference Figure 2 and Figure 3 When in use, after the first connecting column 212 is inserted into the first mounting groove 221, the staff can place the pin 52 in the rotating body 22 and tighten the limiting bolt 51 so that the end of the limiting bolt 51 presses the pin 52 tightly, so that the pin 52 is away from one end of the limiting bolt 51 and passes through the rotating body 22 and is inserted into the first annular groove 214, thereby limiting the pin 52 through the limiting bolt 51 and the first annular groove 214, so that the first connecting column 212 is clamped in the first mounting groove 221, and at the same time, the end of the pin 52 rotates in the first annular groove 214, and the outer surface of the pin 52 is smooth to ensure the rotational cooperation between the rotating body 22 and the inner cover body 21.

[0044] Reference Figure 2 and Figure 3A sealing structure 4 is provided on the inner wall of the bottom of the inner cover body 21. In this embodiment, the sealing structure 4 includes a first sealing gasket 41. A snap-in groove 211 is opened on the inner wall of the bottom of the inner cover body 21. The first sealing gasket 41 is snap-fitted and embedded in the snap-in groove 211. In this embodiment, the snap-in groove 211 limits the snap-in position of the first sealing gasket 41 to achieve the assembly of the first sealing gasket 41 and the inner cover body 21; when in use, the leakage core 2 is placed in the valve cavity, so that the inner cover body 21 is buckled on the channel in the valve cavity, and the gap between the inner cover body 21 and the channel in the valve cavity is sealed by the first sealing gasket 41, so as to ensure the sealing effect of the explosion-proof floor drain in the closed state.

[0045] Reference Figure 2 and Figure 3 The clamping structure 3 is arranged on the inner wall of the upper shell 11. The clamping structure 3 is composed of a plurality of limit blocks 31. The limit blocks 31 are integrally formed on the inner wall of the upper shell 11, and the plurality of limit blocks 31 are rotationally symmetrically arranged along the axis of the upper shell 11. A first guide inclined surface 32 is formed at the bottom end of the limit block 31, and an embedding groove 33 is formed at the top of the limit block 31. A plurality of abutment blocks 23 are integrally formed on the rotating body 22. The number of abutment blocks 23 is the same as the number of limit blocks 31, and they are arranged one-to-one with the limit blocks 31. A second guide inclined surface 24 is formed on the upper end surface of the abutment block 23. In this embodiment, the second guide inclined surface 24 and the first guide inclined surface 32 are arranged parallel to each other.

[0046] Reference Figure 2 and Figure 3 When the cam 23 is in the closed position, the locking cam 33 is engaged with the locking cam 31, and the locking cam 33 is engaged with the locking cam 31, thereby closing the cam 23 and closing the cam 23.

[0047] Reference Figure 1In addition, a number of weight-reducing holes 7 are provided through the rotating body 22, and the number of weight-reducing holes 7 are distributed at intervals on the rotating body 22, and the weight-reducing holes 7 are communicated with the valve cavity. A first handle 224 is installed on the rotating body 22, and a hexagonal bolt groove 9 is provided on the rotating body 22. When in use, the first handle 224 makes it convenient for the staff to lift the rotating body 22, and the opening of the hexagonal bolt groove 9 makes it convenient for the staff to use an inner hexagonal wrench to apply force to tighten the rotating body 22. The setting of the weight-reducing holes 7 can reduce the overall weight of the leakage core 2 on the one hand, making it easier for the staff to hold it, and on the other hand reduce the processing cost of the leakage core 2, making it more convenient for actual production.

[0048] Reference Figure 1 In this embodiment, in order to prevent the first handle 224 from affecting the staff's use of the hex wrench to insert the hexagonal bolt groove 9, a bent section is provided at the bottom end of the first handle 224, that is, when the first handle 224 is used, the first handle 224 is tilted as a whole on the rotating body 22.

[0049] The implementation principle of the embodiment of the present application is as follows: when in use, the leakage core 2 is placed in the valve cavity, so that the inner cover body 21 is buckled on the upper end of the channel in the valve cavity, thereby providing support force to the leakage core 2 as a whole through the channel in the valve cavity, reducing the burden on the staff. After that, the staff only needs to use an inner hexagonal wrench to insert it into the hexagonal bolt groove 9, and then apply force to the inner hexagonal wrench, rotate the rotating body 22 in the clockwise direction, so that the abutment block 23 is rotated to the bottom of the limit block 31, thereby realizing the abutment force of the limit block 31 on the abutment block 23, pressing the inner cover body 21 on the channel in the valve cavity, and then through the first sealing gasket 41 seals the channel in the valve cavity to achieve the closure of the explosion-proof floor drain. During this process, the greater the force applied by the staff on the hexagonal wrench, the better the sealing effect of the explosion-proof floor drain. When the explosion-proof floor drain needs to be opened, it is only necessary to rotate the rotating body 22 in the counterclockwise direction to rotate the abutment block 23 to the corresponding area of ​​the exit, and then move the leakage core 2 as a whole to the outside of the valve cavity, and place the leakage core 2 on top of the limit block 31. The abutment block 23 is embedded in the embedding groove 33 to achieve the placement of the leakage core 2, thereby achieving the opening of the explosion-proof floor drain. The overall use process is simple and convenient, and also ensures the use effect of the explosion-proof floor drain.

[0050] Example 2:

[0051] Reference Figure 4The difference between this embodiment and embodiment 1 is that, in this embodiment, the sealing structure 4 is composed of a second sealing gasket 42, the top end of the second sealing gasket 42 is directly fixed to the inner wall of the bottom of the inner cover body 21 through a rubber coating process, and a sealing groove 43 is opened on the bottom end surface of the second sealing gasket 42, and the sealing groove 43 forms an embedded fit with the end of the channel in the valve cavity; when in use, the inner cover body 21 and the second sealing gasket 42 are pressed down by the cooperation of the abutment block 23 and the limit block 31 until the end of the channel in the valve cavity is embedded in the sealing groove 43, thereby achieving the closure of the explosion-proof floor drain. At the same time, the covering of the channel in the valve cavity by the sealing groove 43 ensures the sealing performance of the explosion-proof floor drain after closure, which is more conducive to use.

[0052] Example 3:

[0053] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 2 is that the positioning structure 5 is composed of a latch 53 and a return spring 54, wherein a plurality of latches 53 are provided, and the plurality of latches 53 are evenly spaced along the circumference of the rotating body 22, the number of return springs 54 is the same as the number of latches 53, and the plurality of return springs 54 are provided in a one-to-one correspondence with the latches 53, and the return springs 54 are sleeved on the latch 53, and a second connecting column 213 is integrally formed at the top end of the inner cover 21, and a second mounting groove 222 is integrally formed at the bottom end of the rotating body 22, the second connecting column 213 is rotatably inserted in the second mounting groove 222, and a second annular groove 223 is opened on the outer wall of the second connecting column 213, the latch 53 is slidably inserted on the rotating body 22, and the end of the latch 53 passes through the rotating body 22 and is inserted into the second annular groove 223.

[0054] Reference Figure 5 and Figure 6 When the latch 53 is passed through the rotating body 22, one end of the return spring 54 abuts against the end of the latch 53, and the other end of the return spring 54 abuts against the rotating body 22. A limiting structure 6 is also provided on the rotating body 22. When in use, the second connecting column 213 is first inserted into the second mounting groove 222, and then the latch 53 and the return spring 54 are installed one by one at the corresponding positions on the rotating body 22. Finally, the latch 53 is limited by the limiting structure 6 to prevent the latch 53 from falling out of the second annular groove 223 under the elastic force of the return spring 54.

[0055] Reference Figure 5 and Figure 6The limiting structure 6 includes a limiting sleeve 61, which is coaxially arranged with the rotating body 22. The top of the limiting sleeve 61 is threadedly connected to the outer wall of the bottom end of the rotating body 22. The inner wall of the bottom end of the limiting sleeve 61 is flared, that is, the inner wall surface of the bottom end of the limiting sleeve 61 is inclined outward from top to bottom. An abutting end is formed at the end of the latch 53 away from the second annular groove 223. In this embodiment, the abutting end is a spherical surface, and the abutting end is in abutment with the inclined surface of the inner wall of the limiting sleeve 61.

[0056] Reference Figure 5 and Figure 6 When the cam 22 is in the unlocked position, the locking cam 61 is released and the locking cam 61 is released, and the locking cam 61 is released, and the locking cam 61 is released, and the locking cam 61 is released, and the locking cam 61 is released, and the locking cam 61 is released.

[0057] Reference Figure 5 and Figure 6 In order to facilitate the staff to screw the limit sleeve 61, a second handle 8 is rotatably provided on the limit sleeve 61. When in use, the staff can rotate the second handle 8 to drive the rotation of the limit sleeve 61. Compared with Example 1, which requires the use of tools to remove the limit bolt 51 and also requires attention to the storage of the limit bolt 51, the use of this embodiment is more convenient.

[0058] The implementation principle of the embodiment of the present application is: when in use, the leakage core 2 can be quickly disassembled and assembled by screwing the limit sleeve 61, and then the leakage core 2 is placed in the valve cavity as a whole, and then the rotating body 22 is screwed clockwise to rotate the abutment block 23 to the bottom of the limit block 31, so that the leakage core 2 is pressed tightly on the channel in the valve cavity through the abutment limit of the limit block 31, thereby realizing the closure of the explosion-proof floor drain; when the explosion-proof floor drain needs to be opened, it is only necessary to screw the rotating body 22 counterclockwise to disengage the abutment block 23 from the limit block 31, and then the leakage core 2 is taken out and placed above the limit block 31, and the abutment block 23 is limited by the embedded groove 33 to realize the opening of the explosion-proof floor drain, and the overall use process is simpler and more convenient.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An explosion-proof floor drain for civil air defense projects, characterized by: The invention comprises a floor drain shell (1) and a drain core (2); a valve cavity is formed on the floor drain shell (1); a clamping structure (3) for clamping and fixing the drain core (2) is provided in the valve cavity; the drain core (2) comprises an inner cover (21) for blocking a passage in the valve cavity, and a rotating body (22) rotatably connected to the inner cover (21); a sealing structure (4) for sealing the passage in the valve cavity is provided on the inner cover (21); and a positioning structure (5) for preventing the inner cover (21) from separating from the rotating body (22) is provided on the rotating body (22).

2. The explosion-proof floor drain for civil air defense projects according to claim 1, characterized in that: The clamping structure (3) includes a plurality of limit blocks (31) fixed on the inner wall of the valve cavity, and the plurality of limit blocks (31) are rotationally symmetrically arranged about the valve cavity axis core. The rotating body (22) is fixed with a plurality of abutment blocks (23), and the plurality of abutment blocks (23) are arranged in a one-to-one correspondence with the limit blocks (31), and the abutment blocks (23) and the limit blocks (31) are in abutment with each other. The limit block (31) is provided with a first guide bevel (32), and the abutment block (23) is provided with a second guide bevel (24). The first guide bevel (32) and the second guide bevel (24) are arranged in cooperation with each other. The limit block (31) is also provided with an embedding groove (33) for embedding the abutment block (23).

3. The explosion-proof floor drain for civil air defense projects according to claim 2, characterized in that: The sealing structure (4) comprises a first sealing gasket (41) arranged on the inner cover body (21); a snap-fit ​​groove (211) is provided on the inner cover body (21); and the first sealing gasket (41) is snap-fitted and embedded in the snap-fit ​​groove (211).

4. The explosion-proof floor drain for civil air defense projects according to claim 2, characterized in that: The sealing structure (4) includes a second sealing gasket (42) fixed on the inner cover body (21), and a sealing groove (43) is provided on the second sealing gasket (42), and the sealing groove (43) is embedded with the end of the channel in the valve cavity.

5. The explosion-proof floor drain for civil air defense projects according to claim 1, characterized in that: The positioning structure (5) includes a limiting bolt (51) threadedly connected to the rotating body (22) and a pin (52) passing through the rotating body (22); a first connecting column (212) is fixed to the end of the inner cover (21) away from the sealing structure (4); a first mounting groove (221) is provided on the rotating body (22); the first connecting column (212) rotates in the first mounting groove (221); a first annular groove (214) is provided on the side wall of the first connecting column (212); an end of the pin (52) away from the limiting bolt (51) passes through the rotating body (22) and is inserted into the first annular groove (214); one end of the limiting bolt (51) is in abutment with the pin (52).

6. The explosion-proof floor drain for civil air defense projects according to claim 1, characterized in that: The positioning structure (5) includes a latch (53) slidably arranged on the rotating body (22) and a return spring (54) sleeved on the latch (53); a second connecting column (213) is fixed to one end of the inner cover (21) away from the sealing structure (4); a second mounting groove (222) is provided on the rotating body (22); the second connecting column (213) rotates in the second mounting groove (222); a second annular groove (223) is provided on the side wall of the second connecting column (213); one end of the latch (53) passes through the rotating body (22) and is plugged into the second annular groove (223); one end of the return spring (54) abuts against the latch (53); the other end of the return spring (54) abuts against the outer wall of the rotating body (22); a limiting structure (6) for preventing the latch (53) from disengaging from the second annular groove (223) is provided on the rotating body (22).

7. The explosion-proof floor drain for civil air defense projects according to claim 6, characterized in that: The limiting structure (6) comprises a limiting sleeve (61) arranged on the rotating body (22), one end of the limiting sleeve (61) is threadedly connected to the rotating body (22), the inner wall of the other end of the limiting sleeve (61) is flared, and the end of the latch (53) away from the second annular groove (223) forms an abutting end, and the abutting end of the latch (53) abuts and cooperates with the inclined surface of the inner wall of the limiting sleeve (61).

8. The explosion-proof floor drain for civil air defense projects according to claim 1, characterized in that: The floor drain housing (1) comprises an upper shell (11) and a lower shell (12); a plug-in block (13) is fixed to one end of the upper shell (11) facing the lower shell (12); a plug-in slot (14) is provided at one end of the lower shell (12) facing the upper shell (11); the plug-in block (13) is plugged into and engaged with the plug-in slot (14); and the snap-in structure (3) is provided on the upper shell (11).

9. The explosion-proof floor drain for civil air defense projects according to claim 1, characterized in that: A weight-reducing hole (7) is provided on the rotating body (22), and the weight-reducing hole (7) is communicated with the valve cavity.

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