Protective box

Abstract

The utility model discloses a protection box, comprising: a box body with a mounting hole, a fireproof cover shell embedded in the mounting hole of the box body, a pressure relief valve is arranged at one end of the fireproof cover shell located outside the box body, and a fire-blocking assembly is arranged at the other end of the fireproof cover shell; the pressure relief valve comprises: a body with a through hole in the center, a piston disc and a guide column located on the opposite side of the body and the fire-blocking assembly, one end of the guide column embedded in the through hole of the body is connected to the piston disc, a spring is arranged between the other end of the guide column and the body, the body has a plurality of hollow areas around the through hole, a blind hole is opened at one end of the guide column facing the fire-blocking assembly, and the mounting hole has a flange located inside the box body, and the flange is matched and connected with the fireproof cover shell. The utility model protection box realizes rapid pressure relief of the protection box, and also improves the adjustment accuracy of the pressure balance between the inside and outside of the protection box, which is conducive to improving the stability of the internal pressure of the protection box.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof equipment, in particular to a protection box. Background Art

[0002] The explosion-proof boxes on the market are electrical protection boxes, which are mainly used as switch boxes or control boxes in inflammable and explosive places such as chemical plants. The explosion-proof principle is to seal the box body to isolate the air inside and outside, so that the flammable and explosive gases outside will not enter the box, and the sparks generated by the electrical appliances in the box will not escape to the outside. Its structure and usage characteristics are high sealing requirements. The internal explosion-proof equipment is to prevent the impact of the internal explosion of the box on the surrounding objects. Generally, it will release pressure when the internal pressure of the box increases sharply, and form a high-pressure gas release channel or storage space through the deformation of the shell, the breaking of local weak points, and the operation of the internal mechanical structure.

[0003] In the prior art, passive pressure relief is generally performed through the pressure relief piston disk of the protection box. The internal pressure of the protection box accumulates to the opening threshold of the piston disk, and the piston disk opens the pressure relief hole to relieve pressure. However, the opening threshold of the piston disk in the prior art is relatively high, resulting in a delay in the initial stage of pressure relief. When the internal pressure of the protection box drops, the pressure relief is interrupted in advance. When the internal pressure of the protection box accumulates above the opening threshold of the piston disk, the piston disk is opened again to relieve pressure, resulting in intermittent pressure relief process of the protection box, making it difficult to release the internal pressure continuously, resulting in unstable pressure inside the protection box. Summary of the invention

[0004] The purpose of the utility model is to provide a protection box, which realizes rapid pressure relief of the protection box and also improves the adjustment accuracy of the pressure balance inside and outside the protection box, which is beneficial to improving the stability of the internal pressure of the protection box.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a protective box, comprising: a box body with a mounting hole, a fireproof cover shell embedded in the mounting hole of the box body, a pressure relief valve is arranged at one end of the fireproof cover shell located outside the box body, and a fire-blocking assembly is arranged at the other end of the fireproof cover shell;

[0006] The pressure relief valve includes: a body with a through hole in the center, a piston disc and a guide column located on the side of the body opposite to the fire-blocking component, one end of the guide column embedded in the through hole of the body is connected to the piston disc, a spring is arranged between the other end of the guide column and the body, the body has a plurality of hollow areas around the through hole, and a blind hole is opened at one end of the guide column facing the fire-blocking component.

[0007] The further improved scheme in the above technical scheme is as follows:

[0008] 1. In the above solution, a fastener is installed at one end of the fireproof cover shell located in the box body.

[0009] 2. In the above solution, a first filter is provided at the end of the fire-blocking assembly opposite to the pressure relief valve, and a second filter is provided between the fire-blocking assembly and the pressure relief valve.

[0010] 3. In the above solution, the mounting hole has a flange located inside the box body, and the flange is connected with the fireproof cover shell.

[0011] 4. In the above solution, the main body and the fireproof cover shell are sealed and connected by a sealing ring.

[0012] 5. In the above solution, the number of the hollow areas is 3 to 6.

[0013] 6. In the above solution, a sealing door panel is provided on one side of the box body.

[0014] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0015] 1. The utility model provides a protective box, wherein the fireproof cover shell is embedded in the mounting hole of the box body, one end of the guide column in the through hole of the main body embedded in the pressure relief valve is connected to the piston disc, a spring is arranged between the other end of the guide column and the main body, the main body is provided with a plurality of hollow areas around the through hole, and a blind hole is arranged at one end of the guide column facing the fire-blocking component, the high-pressure gas in the box body enters the interior of the fireproof cover shell body and impacts the blind holes on the piston disc and the guide rod after passing through the fire-blocking component, and jointly pushes the piston disc to open and pass through the hollow area for rapid pressure relief, on the basis of achieving fire-blocking, reduces the pressure threshold for opening the piston disc, improves the response speed of the opening of the piston disc, realizes rapid pressure relief of the protective box, avoids the situation that the pressure relief process is intermittent due to repeated opening and closing of the piston disc, improves the adjustment accuracy of the pressure balance inside and outside the protective box, improves the continuity of the pressure relief process of the protective box, and is conducive to improving the stability of the internal pressure of the protective box.

[0016] 2. In the protective box of the utility model, a first filter screen 7 is provided at the end of the fire-blocking component opposite to the pressure relief valve, and a second filter screen is provided between the above-mentioned fire-blocking component and the pressure relief valve. The first filter screen and the second filter screen are used to filter on both sides of the fire-blocking component, and the ejected gas can be filtered multiple times, which not only reduces the situation where larger particles carried by the internal ejected gas clog the fire-blocking component, but also reduces the situation where debris inside the box is ejected and injures people during the pressure relief process, and also reduces the risk of the ejected debris jamming the piston disc and causing the piston disc to fail to close normally, thereby improving the safety and reliability of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a schematic diagram of the overall structure of the protective box of the utility model;

[0018] Attached Figure 2It is a cross-sectional perspective view of the protection box of the utility model;

[0019] Attached Figure 3 For the utility model Figure 2 A magnified image of point A;

[0020] Attached Figure 4 It is a schematic diagram of the partial structural decomposition of the protective box of the utility model.

[0021] In the above drawings: 1. Fireproof cover shell; 2. Pressure relief valve; 201. Main body; 202. Through hole; 203. Piston disc; 204. Guide column; 3. Fire-blocking assembly; 4. Spring; 5. Hollow area; 6. Blind hole; 7. First filter screen; 8. Second filter screen; 9. Sealing ring; 10. Flange; 11. Box body; 12. Mounting hole; 13. Sealing door panel; 14. Fastener. DETAILED DESCRIPTION

[0022] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0023] Embodiment 1: A protective box, comprising: a box body 11 having a mounting hole 12, a fireproof cover shell 1 embedded in the mounting hole 12 of the box body 11, a pressure relief valve 2 being arranged at one end of the fireproof cover shell 1 located outside the box body 11, and a fire-blocking assembly 3 being arranged at the other end of the fireproof cover shell 1;

[0024] When in use, the high-pressure gas carrying the flame in the protection box enters the interior of the fireproof cover shell, and pushes the piston disc and guide column of the pressure relief valve after passing through the fire-blocking component. The gas enters the blind hole of the guide column and jointly pushes the piston disc to compress the spring, so that the piston disc moves through the hollow area for rapid pressure relief, which is conducive to reducing the pressure threshold requirement for opening the piston disc.

[0025] The pressure relief valve 2 includes: a body 201 with a through hole 202 in the center, a piston disc 203 and a guide column 204 located on the side of the body 201 opposite to the fire-blocking component 3, one end of the guide column 204 embedded in the through hole 202 of the body 201 is connected to the piston disc 203, and a spring 4 is arranged between the other end of the guide column 204 and the body 201, the body 201 has a plurality of hollow areas 5 around the through hole 202, and a blind hole 6 is opened at one end of the guide column 204 facing the fire-blocking component 3.

[0026] During the process of pressure rising in the protection box, the piston disc can respond quickly to connect the hollow area with the outside to relieve pressure. During the process of pressure dropping in the protection box, it is beneficial to maintain the continuous opening of the piston disc, avoiding the repeated opening and closing of the piston disc during the pressure relief process.

[0027] A fastener 14 is installed at one end of the fireproof housing 1 located inside the box 11 .

[0028] A first filter screen 7 is disposed at one end of the fire-blocking assembly 3 opposite to the pressure relief valve 2 , and a second filter screen 8 is disposed between the fire-blocking assembly 3 and the pressure relief valve 2 .

[0029] The main body 201 is sealed and connected to the fireproof cover shell 1 via a sealing ring 9 .

[0030] The number of the hollow areas 5 is four.

[0031] Embodiment 2: A protective box, comprising: a box body 11 having a mounting hole 12, a fireproof cover shell 1 embedded in the mounting hole 12 of the box body 11, a pressure relief valve 2 being arranged at one end of the fireproof cover shell 1 located outside the box body 11, and a fire-blocking assembly 3 being arranged at the other end of the fireproof cover shell 1;

[0032] The high-pressure gas in the box enters the fireproof cover shell and impacts the blind holes on the piston disc and the guide rod after passing through the fire-blocking component, and jointly pushes the piston disc to open and quickly release pressure through the hollow area. On the basis of achieving fire blocking, the pressure threshold for opening the piston disc is reduced, the response speed of opening the piston disc is increased, and the situation of intermittent pressure relief caused by repeated opening and closing of the piston disc is avoided, the adjustment accuracy of the pressure balance inside and outside the protection box is improved, the continuity of the pressure relief process of the protection box is improved, and the stability of the internal pressure of the protection box is improved;

[0033] The pressure relief valve 2 includes: a body 201 with a through hole 202 in the center, a piston disc 203 and a guide column 204 located on the side of the body 201 opposite to the fire-blocking component 3, one end of the guide column 204 embedded in the through hole 202 of the body 201 is connected to the piston disc 203, and a spring 4 is arranged between the other end of the guide column 204 and the body 201, the body 201 has a plurality of hollow areas 5 around the through hole 202, and a blind hole 6 is opened at one end of the guide column 204 facing the fire-blocking component 3.

[0034] A fastener 14 is installed at one end of the fireproof housing 1 located inside the box 11 .

[0035] A first filter screen 7 is provided at the end of the fire-blocking component 3 opposite to the pressure relief valve 2, and a second filter screen 8 is provided between the fire-blocking component 3 and the pressure relief valve 2; the first filter screen and the second filter screen are used to filter on both sides of the fire-blocking component, so that the ejected gas can be filtered multiple times, which not only reduces the situation where larger particles carried by the internal ejected gas clog the fire-blocking component, but also reduces the situation where debris inside the box is ejected and injures people during the pressure relief process, and also reduces the risk of the ejected debris jamming the piston disc and causing the piston disc to fail to close normally, thereby improving the safety and reliability of the box use.

[0036] The mounting hole 12 has a flange 10 located inside the box body 11 , and the flange 10 is connected with the fireproof cover shell 1 .

[0037] The number of the hollow areas 5 is five.

[0038] A sealing door panel 13 is disposed on one side of the box body 11 .

[0039] The working principle is as follows: when in use, the high-pressure gas carrying the flame in the protection box enters the interior of the fireproof cover shell, and pushes the piston disc and guide column of the pressure relief valve after passing through the fire-blocking component, and the gas enters the blind hole of the guide column, and jointly pushes the piston disc to compress the spring, so that the piston disc moves through the hollow area for rapid pressure relief, which is conducive to reducing the pressure threshold requirement for the piston disc to open;

[0040] During the process of pressure rising in the protection box, the piston disc can respond quickly to connect the hollow area with the outside to relieve pressure. During the process of pressure dropping in the protection box, it is beneficial to maintain the continuous opening of the piston disc, avoiding the repeated opening and closing of the piston disc during the pressure relief process.

[0041] When the above-mentioned protection box is used, the high-pressure gas in the box enters the interior of the fireproof cover shell and impacts the blind holes on the piston disc and the guide rod after passing through the fire-blocking component, and jointly pushes the piston disc to open and quickly release pressure through the hollow area. On the basis of achieving fire blocking, the pressure threshold for opening the piston disc is reduced, the response speed of opening the piston disc is increased, and the situation that the pressure relief process is intermittent due to repeated opening and closing of the piston disc is avoided, the adjustment accuracy of the pressure balance inside and outside the protection box is improved, and the continuity of the pressure relief process of the protection box is improved, which is conducive to improving the stability of the internal pressure of the protection box;

[0042] In addition, the first filter and the second filter are used to filter on both sides of the fire-blocking component, so that the ejected gas can be filtered multiple times, which not only reduces the possibility of large particles carried by the internal ejected gas clogging the fire-blocking component, but also reduces the possibility of debris inside the box being ejected and injuring people during the pressure relief process. It also reduces the risk of the ejected debris jamming the piston disc and causing the piston disc to fail to close normally, thereby improving the safety and reliability of the box use.

[0043] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A protective box, comprising: A box (11) having a mounting hole (12), characterized in that: a fireproof cover shell (1) is embedded in the mounting hole (12) of the box (11), a pressure relief valve (2) is provided at one end of the fireproof cover shell (1) located outside the box (11), and a fire-blocking assembly (3) is provided at the other end of the fireproof cover shell (1); The pressure relief valve (2) comprises: a body (201) having a through hole (202) at the center, a piston disc (203) and a guide column (204) located on the side of the body (201) opposite to the fire-blocking assembly (3); one end of the guide column (204) embedded in the through hole (202) of the body (201) is connected to the piston disc (203); a spring (4) is arranged between the other end of the guide column (204) and the body (201); the body (201) has a plurality of hollow areas (5) located around the through hole (202); and a blind hole (6) is provided at one end of the guide column (204) facing the fire-blocking assembly (3).

2. The protective box according to claim 1, characterized in that: A fastener (14) is installed at one end of the fireproof cover shell (1) located inside the box body (11).

3. The protective box according to claim 1, characterized in that: A first filter screen (7) is provided at the end of the fire-blocking component (3) opposite to the pressure relief valve (2), and a second filter screen (8) is provided between the fire-blocking component (3) and the pressure relief valve (2).

4. The protective box according to claim 1, characterized in that: The mounting hole (12) has a flange (10) located inside the box body (11), and the flange (10) is connected to the fireproof cover shell (1).

5. The protective box according to claim 1, characterized in that: The main body (201) is sealedly connected to the fireproof cover shell (1) via a sealing ring (9).

6. The protective box according to claim 1, characterized in that: The number of the hollow areas (5) is 3 to 6.

7. The protective box according to claim 1, characterized in that: A sealing door panel (13) is provided on one side of the box body (11).

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