Positive pressure compensation type explosion-proof distribution cabinet, explosion-proof positive pressure cabinet

Explosion-proof positive pressure cabinet

Product Introduction

1. When the air pressure is higher than 1000Pa, the pressure relief valve automatically opens the exhaust valve to adjust the internal air pressure, so that the product will not be deformed or damaged by the impact of high air pressure.

2. When the air pressure is lower than 50Pa, the automatic control system will automatically send out an alarm and output an alarm signal. It is necessary to adjust the internal pressure. If the air supply is successful, it will automatically return to normal; otherwise, the system can be set to automatically power off when necessary (the national standard stipulates that the power of the cabinet must be cut off for low-pressure alarm in Zone 1, and the power does not need to be cut off for low-pressure alarm in Zone 2).

3. Only when the cabinet air pressure meets the specified air pressure requirements, the positive pressure purge control system will effectively ventilate the cabinet (Zone 1 needs to replace 7 times the free space of the cabinet, and Zone 2 needs to replace 5 times the free space of the cabinet). After the effective ventilation is completed, a signal will be provided to power on the cabinet.

4. The working air pressure inside the positive pressure cabinet is 50Pa ≤ P ≤ 1000Pa.

Scope of Application

1. Hazardous locations for gas mixtures: Zone 0, Zone 1, Zone 2.

2. Gas mixtures: ⅡA, ⅡB, ⅡC.

3. Temperature groups: T1～T6.

4. Indoor and outdoor use (IP55)

5. Combustible dust environments: Zone 20, Zone 21, Zone 22

6. Corrosion protection grade: WF1

7. Suitable for hazardous environments such as petroleum, petrochemical, chemical, brewing, pharmaceutical, paint, textile, printing and dyeing;

Technical Parameters

1. Explosion-proof mark: ExpeIICT4;

2. Rated voltage: AC220/380V, non-standard voltage: 12V/24V/36V/127V/660V;

3. Main switch current: 10A—40A;

4. Protection grade: IP54/IP55/IP65/IP66;

5. Thread specification: DN15-DN100/G1/2-G4 inches

6. Lead-in wire specification: diameter 6mm-80mm; Lead-out wire specification: diameter 6mm-80mm;

7. Lead-in and lead-out direction: top-in top-out, bottom-in bottom-out (can be customized as required by customers without restriction)

Functions of the positive pressure purge control system for explosion-proof positive pressure cabinets and structural features of the explosion-proof positive pressure cabinet

1. Its explosion-proof principle mainly adopts explosion-proof measures of medium isolation of ignition sources and forms positive pressure protection to achieve the purpose of electrical explosion protection;

2. Structurally, it can be customized into box-type, console-type and cabinet-type structures according to user requirements. The cabinet-type structure is divided into upper-lower structure and left-right structure. The box-type is generally made of steel plate welding, with surface spray painting and front door operation; The frame of the console-type and cabinet-type is welded with standard profiles, with surface spray painting, and each joint surface has undergone special sealing treatment; Front door operation, rear door for maintenance. The steel plate material generally uses GB710-88 cold-rolled steel plate.

3. According to the air intake method, it is divided into continuous purge type and leakage compensation type. The continuous purge type provides uninterrupted air supply, and the working heat of the components installed in the positive pressure cavity can be taken away by the air path, with good heat dissipation function; The leakage compensation type provides intermittent air supply, the positive pressure cavity has good sealing performance, and the air consumption is small;

4. The positive pressure purge control system has complete protection devices. Only after reaching the specified ventilation time can it be automatically powered on, and it has safety interlock protection such as high and low pressure automatic sound and light alarm, low pressure limit, automatic power off when opening the door, and emergency manual power off.

5. The sealing performance is reliable, the shell adopts multiple sealing protections, the pressure holding time is long, and the operation cost is saved.

6. This cabinet adopts the cable trench base installation form, and the user needs to provide a protective gas source.

7. The product can be equipped with detection instruments, analysis instruments, display instruments, low-voltage electrical appliances, frequency converters, soft starters or computer control systems, and can be used as a central signal processing system and a central control system. During manufacturing, the user must provide a complete electrical system diagram and a bill of materials for the control system.

8. Multiple cabinets can be connected in parallel.

9. It can be produced according to the electrical schematic diagram provided by the user.

10. The outer shell of this product is made of high-quality steel plate welding or stainless steel welding, and the surface is electrostatically sprayed with powder after high-speed shot blasting, with beautiful appearance;

11. The explosion-proof positive pressure cabinet consists of two parts: the cabinet and the positive pressure purge control device. The air source of the explosion-proof positive pressure cabinet enters the cabinet through the positive pressure purge control device to purge and meet the safe air pressure requirements. When a low-pressure alarm occurs, the positive pressure purge control device will output an alarm signal, and the power of the positive pressure cabinet will be cut off if necessary.

12. Under the control of the positive pressure control system, the positive pressure cabinet is filled with protective gas, and the pressure in the positive pressure cavity is higher than the pressure outside the positive pressure cavity, forming a micro-positive pressure safe small environment, which prevents flammable and dangerous gases from entering the positive pressure cavity, ensuring the safe operation of ordinary instruments and electrical components installed inside.

13. The automatic control system mainly completes high-end functions such as ventilation, air supply, automatic overpressure relief, low-pressure alarm and low-pressure interlock power off.