Positive pressure explosion-proof protection device

Abstract

The utility model relates to the technical field of explosion-proof protection, and discloses a positive pressure explosion-proof protection device, which comprises a gas storage cabinet and an exchanger, a compressed gas tank is arranged in the gas storage cabinet, the gas storage cabinet is fixedly arranged on the outer side of a power distribution cabinet, and the exchanger comprises a first connecting box and a second connecting box. A plurality of heat exchange pipes are fixedly mounted between the first connecting box and the second connecting box, the first connecting box is communicated with the second connecting box through the heat exchange pipes, the first connecting box is communicated with the compressed air tank through an input air pipe, and a pressure release valve is fixedly mounted on the surface of the second connecting box. Compressed nitrogen is introduced into the exchanger through the compressed gas tank, the exchanger is arranged in the power distribution cabinet, the compressed nitrogen expands in the exchanger to absorb heat so as to achieve the auxiliary heat dissipation effect, and meanwhile nitrogen discharged by the pressure release valve is introduced into the power distribution cabinet, so that the air pressure in the cabinet is larger than the external air pressure, and a positive pressure environment is formed. External combustible gas and dust can be effectively prevented from entering the power distribution cabinet, and the positive-pressure explosion-proof effect is achieved.

Description

Technical Field

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

[0002] At present, there are more and more explosion-proof electrical equipment used in explosion-hazardous places such as petroleum and chemical industries in my country. For example, the positive pressure explosion-proof protection device disclosed in the prior art with announcement number CN206585868U is used to be installed on the side wall of the positive pressure shell type equipment, including a mounting plate, a pressure reducing valve arranged on the inner wall of the mounting plate, a two-position four-way rotary valve and a one-way throttle valve, the inlet end of the pressure reducing valve is provided with a compressed gas pipe joint, the outlet end of the pressure reducing valve is connected to the medium input interface of the two-position four-way rotary valve, the two working interfaces of the two-position four-way rotary valve are connected to the two ends of the one-way throttle valve to realize the switching of the airflow direction, the outer wall of the mounting plate is provided with a gear switching knob of the two-position four-way rotary valve; the outer wall of the mounting plate is also provided with a first pressure gauge for detecting the internal pressure of the positive pressure shell type equipment. The positive pressure explosion-proof protection device provided by the utility model can realize the explosion-proof of positive pressure shell type equipment.

[0003] When using the explosion-proof device on a distribution cabinet, in order to ensure that the air pressure inside the distribution cabinet is greater than the external air pressure, many heat dissipation ports are cancelled, and the heat generated by the internal heating components cannot be discharged in time, posing a serious safety hazard and cannot be used directly. Based on this, the existing positive pressure explosion-proof device has the problem of hindering heat dissipation and needs further improvement. Utility Model Content

[0004] The purpose of the utility model is to provide a positive pressure explosion-proof protection device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a positive pressure explosion-proof protection device, comprising a gas storage cabinet and an exchanger, wherein a compressed gas tank is placed in the gas storage cabinet, and the gas storage cabinet is fixedly installed on the outside of the power distribution cabinet;

[0006] The exchanger includes a first connection box and a second connection box, a plurality of heat exchange tubes are fixedly installed between the first connection box and the second connection box, and the first connection box and the second connection box are connected through the heat exchange tubes, the first connection box is connected with the compressed gas tank through the input air pipe, and a pressure relief valve is fixedly installed on the surface of the second connection box;

[0007] A first mounting plate is fixedly installed on the lower side of the exchanger, and a circulating fan is embedded on the surface of the first mounting plate. The first mounting plate is fixedly installed inside the power distribution cabinet. The first mounting plate divides the inner cavity of the power distribution cabinet into an upper mounting cavity and a lower cooling cavity. The pressure relief valve extends into the cooling cavity on the lower side of the first mounting plate. The exchanger absorbs heat to achieve auxiliary heat dissipation. Nitrogen is introduced into the power distribution cabinet to make the air pressure inside the cabinet greater than the external air pressure, forming a positive pressure explosion-proof environment.

[0008] In some embodiments, a cabinet door is hinged on the surface of the gas storage cabinet, a clamp is fixedly installed inside the gas storage cabinet, the compressed gas tank is fixed in the clamp, an electromagnetic valve is fixedly installed inside the input air duct, and the electromagnetic valve is fixedly installed on the outside of the gas storage cabinet. The flow of the input air duct can be controlled by opening and closing the electromagnetic valve.

[0009] In some embodiments, an exhaust hood is embedded in the inner wall of the distribution cabinet, the outlet end of the exhaust hood extends to the outside of the distribution cabinet and is fixedly installed with a dust screen, and a circulating air duct is fixedly installed on the surface of the exhaust hood, the bottom end of the circulating air duct extends to the cooling cavity on the lower side of the first mounting plate, and the cooling cavity is connected with the inner cavity of the exhaust hood through the circulating air duct. The air discharged to the outside by the exhaust hood is introduced into the cooling cavity on the lower side of the first mounting plate by the circulating air duct for recycling, thereby reducing nitrogen loss.

[0010] In some embodiments, a gate plate is slidably installed inside the exhaust hood, a telescopic cylinder is fixedly installed on the upper side of the exhaust hood, the telescopic end of the telescopic cylinder is fixedly connected to the gate plate, and the gate plate is opened and closed by the telescopic movement of the telescopic cylinder. An exhaust fan is embedded on the inner side of the exhaust hood to adjust the opening size of the gate plate, thereby facilitating the control of the exhaust speed through the dustproof net.

[0011] In some embodiments, a second mounting plate is fixedly installed inside the power distribution cabinet, a ventilation window is opened on the surface of the second mounting plate, and a protective net is fixedly installed at the ventilation window, and the exchanger is arranged on the lower side of the ventilation window of the second mounting plate. Beneficial Effects

[0012] The utility model provides a positive pressure explosion-proof protection device, which has the following beneficial effects:

[0013] 1. This positive pressure explosion-proof protection device introduces compressed nitrogen into the exchanger through a compressed gas tank. The exchanger is set in the power distribution cabinet. The compressed nitrogen expands in the exchanger to absorb heat, thereby assisting the power distribution cabinet in heat dissipation. At the same time, the nitrogen discharged from the pressure relief valve is introduced into the power distribution cabinet, so that the air pressure in the cabinet is greater than the external air pressure, forming a positive pressure environment, which can effectively prevent external flammable gases and dust from entering the power distribution cabinet, so that it meets the requirements of rapid heat dissipation and achieves the effect of positive pressure explosion protection.

[0014] 2. The positive pressure explosion-proof protection device is provided with a gate plate in the exhaust hood, and the telescopic cylinder drives the gate plate to slide up and down, and the opening size of the gate plate is adjusted to facilitate the control of the exhaust speed through the dustproof net. By providing a circulating air duct, the internal air is introduced into the cooling cavity on the lower side of the first mounting plate through the circulating air duct. After mixing with nitrogen, the mixed gas is heat exchanged again by the exchanger, which plays the role of cooling and air pressure compensation, reduces nitrogen loss, and prolongs the service life of the compressed gas tank, which is more economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front section structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the side section structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-section structure of the exchanger;

[0019] Figure 5 for Figure 2 Enlarged structural diagram at A in the middle.

[0020] In the figure: 1 gas storage cabinet, 2 exchanger, 3 compressed gas tank, 4 power distribution cabinet, 5 first connection box, 6 second connection box, 7 heat exchange pipe, 8 input air duct, 9 pressure relief valve, 10 first mounting plate, 11 clamp, 12 solenoid valve, 13 exhaust hood, 14 dust net, 15 circulating air duct, 16 gate, 17 telescopic cylinder, 18 exhaust fan, 19 second mounting plate, 20 protective net, 21 circulating fan. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 The utility model provides a technical solution: a positive pressure explosion-proof protection device, including a gas storage cabinet 1 and an exchanger 2, a compressed gas tank 3 is placed in the gas storage cabinet 1, a cabinet door is hinged on the surface of the gas storage cabinet 1, a clamp 11 is fixedly installed in the gas storage cabinet 1, the compressed gas tank 3 is fixed in the clamp 11, and the gas storage cabinet 1 is fixedly installed on the outside of the distribution cabinet 4.

[0023] like Figure 4As shown, the exchanger 2 includes a first connecting box 5 and a second connecting box 6, a plurality of heat exchange tubes 7 are fixedly installed between the first connecting box 5 and the second connecting box 6, and the first connecting box 5 and the second connecting box 6 are connected through the heat exchange tubes 7, the first connecting box 5 is connected to the compressed gas tank 3 through the input air duct 8, an electromagnetic valve 12 is fixedly installed inside the input air duct 8, the electromagnetic valve 12 is fixedly installed on the outside of the gas storage cabinet 1, and a pressure relief valve 9 is fixedly installed on the surface of the second connecting box 6.

[0024] A first mounting plate 10 is fixedly mounted on the lower side of the exchanger 2, and a circulating fan 21 is embedded on the surface of the first mounting plate 10. The first mounting plate 10 is fixedly mounted inside the power distribution cabinet 4. The first mounting plate 10 divides the inner cavity of the power distribution cabinet 4 into an upper mounting cavity and a lower cooling cavity. The pressure relief valve 9 extends to the cooling cavity on the lower side of the first mounting plate 10. Compressed nitrogen is stored in the compressed gas tank 3. The compressed nitrogen is injected into the exchanger 2 through the input air duct 8. The nitrogen flows in the heat exchanger 2, so that the exchanger 2 absorbs a large amount of external heat to achieve the effect of heat dissipation.

[0025] A second mounting plate 19 is fixedly installed inside the power distribution cabinet 4 , a ventilation window is opened on the surface of the second mounting plate 19 , and a protective net 20 is fixedly installed at the ventilation window. The exchanger 2 is arranged at the lower side of the ventilation window of the second mounting plate 19 .

[0026] An exhaust hood 13 is embedded in the inner wall of the distribution cabinet 4. The outlet end of the exhaust hood 13 extends to the outside of the distribution cabinet 4 and is fixedly installed with a dustproof net 14. An exhaust fan 18 is embedded in the inner side of the exhaust hood 13 to blow air and pressurize the exhaust hood 13.

[0027] A gate plate 16 is slidably mounted inside the exhaust hood 13, and a telescopic cylinder 17 is fixedly mounted on the upper side of the exhaust hood 13. The telescopic end of the telescopic cylinder 17 is fixedly connected to the gate plate 16, and the gate plate 16 is opened and closed by the telescopic movement of the telescopic cylinder 17. Figure 5 As shown, by arranging a gate plate 16 in the exhaust hood 13, the telescopic cylinder 17 drives the gate plate 16 to slide up and down, and the opening size of the gate plate 16 is adjusted to facilitate the control of the exhaust speed through the dustproof net 14.

[0028] A circulating air duct 15 is fixedly installed on the surface of the exhaust hood 13, and the bottom end of the circulating air duct 15 extends to the cooling cavity on the lower side of the first mounting plate 10. The cooling cavity is connected with the inner cavity of the exhaust hood 13 through the circulating air duct 15. By setting the circulating air duct 15, the internal air is introduced into the cooling cavity on the lower side of the first mounting plate 10 by the circulating air duct 15. After mixing with nitrogen, the mixed gas is heat exchanged again by the exchanger 2, which plays the role of cooling and air pressure compensation, reduces nitrogen loss, and extends the service life of the compressed gas tank 3, making it more economical and practical to use.

[0029] Working principle: Compressed nitrogen is stored in the compressed gas tank 3. The compressed nitrogen is injected into the heat exchanger 2 through the input air duct 8. The nitrogen flows in the heat exchanger 2, causing the heat exchanger 2 to absorb a large amount of external heat. The circulating fan 21 blows air upward, and the air flows through the surface of the exchanger 2 to achieve the effect of heat dissipation. The nitrogen in the exchanger 2 is discharged by the pressure relief valve 9, mixed with the air on the lower side of the circulating fan 21, and is input into the installation cavity on the upper side of the distribution cabinet 4 through the pressurized circulating fan 21 to achieve a positive pressure explosion-proof protection environment. Figure 2 .

[0030] The positive pressure explosion-proof protection device introduces compressed nitrogen into the exchanger 2 through the compressed gas tank 3. The exchanger 2 is arranged in the distribution cabinet 4. The compressed nitrogen expands in the exchanger 2 to absorb heat, thereby achieving the function of assisting the distribution cabinet 4 in heat dissipation. At the same time, the nitrogen discharged by the pressure relief valve 9 is introduced into the distribution cabinet 4, so that the air pressure in the cabinet is greater than the external air pressure, forming a positive pressure environment, which can effectively prevent external flammable gases and dust from entering the distribution cabinet 4, so that it meets the requirements of rapid heat dissipation and achieves the effect of positive pressure explosion-proof.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positive pressure explosion-proof protection device, comprising a gas storage cabinet (1) and an exchanger (2), characterized in that: A compressed gas tank (3) is placed in the gas storage cabinet (1), and the gas storage cabinet (1) is fixedly installed on the outside of the power distribution cabinet (4); The exchanger (2) comprises a first connection box (5) and a second connection box (6); a plurality of heat exchange tubes (7) are fixedly mounted between the first connection box (5) and the second connection box (6); the first connection box (5) and the second connection box (6) are connected via the heat exchange tubes (7); the first connection box (5) is connected to the compressed gas tank (3) via an input air duct (8); and a pressure relief valve (9) is fixedly mounted on the surface of the second connection box (6); A first mounting plate (10) is fixedly mounted on the lower side of the exchanger (2), a circulating fan (21) is embedded on the surface of the first mounting plate (10), the first mounting plate (10) is fixedly mounted inside the power distribution cabinet (4), the first mounting plate (10) divides the inner cavity of the power distribution cabinet (4) into an upper mounting cavity and a lower cooling cavity, and the pressure relief valve (9) extends into the cooling cavity on the lower side of the first mounting plate (10).

2. A positive pressure explosion-proof protection device according to claim 1, characterized in that: A cabinet door is hingedly connected to the surface of the gas storage cabinet (1), a clamp (11) is fixedly installed inside the gas storage cabinet (1), and the compressed gas tank (3) is fixed inside the clamp (11).

3. A positive pressure explosion-proof protection device according to claim 2, characterized in that: An electromagnetic valve (12) is fixedly installed inside the input air duct (8), and the electromagnetic valve (12) is fixedly installed on the outside of the gas storage cabinet (1).

4. A positive pressure explosion-proof protection device according to claim 3, characterized in that: An exhaust hood (13) is embedded in the inner wall of the power distribution cabinet (4); an outlet end of the exhaust hood (13) extends to the outside of the power distribution cabinet (4) and is fixedly mounted with a dust screen (14).

5. A positive pressure explosion-proof protection device according to claim 4, characterized in that: A circulating air duct (15) is fixedly mounted on the surface of the exhaust hood (13); the bottom end of the circulating air duct (15) extends into a cooling cavity on the lower side of the first mounting plate (10); the cooling cavity is connected to the inner cavity of the exhaust hood (13) via the circulating air duct (15).

6. A positive pressure explosion-proof protection device according to claim 5, characterized in that: A gate plate (16) is slidably mounted inside the exhaust hood (13), a telescopic cylinder (17) is fixedly mounted on the upper side of the exhaust hood (13), the telescopic end of the telescopic cylinder (17) is fixedly connected to the gate plate (16), and the gate plate (16) is opened and closed by the telescopic movement of the telescopic cylinder (17).

7. A positive pressure explosion-proof protection device according to claim 6, characterized in that: An exhaust fan (18) is embedded inside the exhaust hood (13).

8. A positive pressure explosion-proof protection device according to any one of claims 1 to 7, characterized in that: A second mounting plate (19) is fixedly mounted inside the power distribution cabinet (4), a ventilation window is provided on the surface of the second mounting plate (19), and a protective net (20) is fixedly mounted at the ventilation window, and the exchanger (2) is arranged on the lower side of the ventilation window of the second mounting plate (19).

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