PXK 防爆正压柜

1、适用于环境温度：-20℃～+40℃；

2、适用于爆炸性气体混合物危险场所：1区、2区；

3、适用于可燃性粉尘场所：21区、22区；

4、适用于石油开采、炼油、化工、军工及军事设施、海洋石油平台、油轮、金属加工、医药等危险环境；

5、适用于对体积较大、内部元器件工作温升较高或电气线路较复杂的产品进行防爆处理；

6、具有稀释气流和泄漏补偿两种处理型式；

7、执行标准：GB/T 3836.1、GB/T 3836.2、GB/T 3836.3、GB/T 3836.5、GB/T 3836.9、IEC 60079-0、IEC 60079-1、IEC 60079-7、IEC 60079-2、IEC 60079-18。

1.Suitable for ambient temperature: -20℃～+40℃;

2.Suitable for dangerous places of explosive gas mixture: 1 zone and 2 zone;

3.Suitable for combustible dust places: 21 and 22 districts;

4.Suitable for hazardous environments such as petroleum exploitation, refining, chemical industry, military and military facilities, offshore oil platforms, oil tankers, metal processing, medicine, etc;

5.It is suitable for explosion-proof treatment of products with large volume, high temperature rise of internal components or complicated electrical circuits.

6.There are two types of treatment: dilution gas flow and leakage compensation.

7.Implementation standards: GB/T 3836.1, GB/T 3836.2, GB/T 3836.3, GB/T 3836.5, GB/T 3836.9, IEC 60079-0, IEC 60079-1, IEC 60079-7, IEC 60079-2, IEC 60079-18.

1、外壳采用优质碳素钢或不锈钢焊接成型，表面高压静电喷塑处理，耐腐蚀，抗静电，牢固可靠。

2、模块化结构设计，正压腔和控制腔可采用上下组合、左右组合、前后组合等方式，也可分离安装。

3、自带气体调压过滤装置，用户只需引入现场工业气源即可，不必安装其它气源元件。

4、设有火花和颗粒挡板，正压腔出气可就地排放，安全可靠。

5、控制系统采用PLC可编程逻辑控制器，稳定可靠，响应速度快。

6、人性化的人机界面，液晶文字显示，集多项功能于一身，减少控制系统面板按钮、指示灯。

7、带有通讯接口，可实现远程集中监视与控制。

8、实时监视正压腔压力、流量等重要参数。

9、可对传感器信号型式和信号值范围进行设定。

10、可对正式换气前的延时时间进行设定，确保正压腔通电前可燃性气体被彻底排出。

11、根据现场气源压力情况，可自行设定工作压力范围、报警压力范围和正压腔电源切断压力范围。

12、根据实际情况设定正压腔尺寸，提高控制程序通用性。

13、程序根据相关参数自动计算换气持续时间。

14、模块化程序设计，只需载入不同程序即可实现不同控制功能。

15、设有系统故障分析程序，并在人机界面以闪烁文字提示用户，方便检修。

16、正压腔内可安装各类检测仪表、分析仪表、显示仪表、低压电器、变频器、软起动器及各类电气控制系统，灵活多变。

1.The shell is welded with high-quality carbon steel or stainless steel. The surface is treated by high-voltage electrostatic spraying. It is corrosion-resistant, antistatic and reliable.

2.Modular structure design, positive pressure chamber and control chamber can be combined up and down, left and right, front and back, or separately installed.

3. With the self-contained gas pressure regulating and filtering device, the user only needs to introduce the industrial gas source on site, without installing other gas source components.

4.With sparks and particle baffles, positive pressure chamber exhaust can be discharged locally, which is safe and reliable.

5.The control system adopts PLC programmable logic controller, which is stable and reliable, and has fast response speed.

6.Humanized man-machine interface, LCD text display, set a number of functions in one, reduce the control system panel buttons, indicator lights.

7.With communication interface, remote centralized monitoring and control can be realized.

8.Real-time monitoring of pressure and flow rate of positive pressure chamber.

9.Sensor signal type and range can be set.

10.The delay time before the formal ventilation can be set to ensure that the combustible gas is completely discharged before the positive pressure chamber is electrified.

11.The working pressure range, alarm pressure range and cut-off pressure range of positive pressure chamber power supply can be set by oneself according to the pressure of gas source on site.

12.Set the size of the positive pressure chamber according to the actual situation to improve the universality of the control program.

13.The program automatically calculates the ventilation duration according to the relevant parameters.

14.Modular programming can realize different control functions by loading different programs.

15.The system fault analysis program is set up, and the user is prompted with flickering words in the man-machine interface for easy maintenance.

16.Positive pressure chamber can be equipped with various kinds of detection instruments, analysis instruments, display instruments, low voltage electrical appliances, frequency converters, soft starters and various electrical control systems, flexible and changeable.

站点名称

防爆原理 Explosion protection principle

1、正压防爆是一种特殊的防爆型式，其主要指导思想是将可燃性物质与点燃源进行隔离，达到防爆的目的。具体实现方法是通过防爆控制

箱内的控制系统与气路系统配合，将来自安全区域的保护气体引入正压腔，在对正压腔内的可燃性气体进行彻底的清洗与置换后，使正压

腔内保持一定的压力，阻止外部危险环境的可燃性气体、导电性粉尘的进入，从而达到防爆目的。

2、根据正压腔的压力保持方式，主要可分为具有稀释气流的正压和具有泄漏补偿的正压两种方式。

3、具有稀释气流的正压是由保护气体持续不断地流过正压腔，在达到防爆要求的同时也可以带走内部元件运行产生的热量，因此更适用于

安装一些发热量较大的电器元件或设备，如变频器、软起动器、大功率可控硅、电动机等。不足之处是所需气流量较大，用户现场气源需

提供足够的流量及压力。

4、具有泄漏补偿的正压是由控制系统实时检测正压腔的压力，通过电磁阀控制保护气体的流入与流出。当正压腔压力过低时，打开进气电

磁阀补气，使压力上升到工作压力范围内；当正压腔压力过高时，打开排气电磁阀排气，使压力下降到工作压力范围内。由于保护气体并

未持续流动，因此具有泄漏补偿的正压外壳内适合于安装发热量较小的低压电器元件，如各类电气控制系统等。

5、根据国家标准的要求，正压型防爆控制柜还必须具备联锁和报警功能。即当正压腔换气过程未完成或正压腔内压力未达到工作压力范围

时，正压腔不能受电，以确保安全。当处于运行中的正压腔内压力低于设定的报警压力下限或上限时，控制系统采取调整措施，同时发出

声光报警提醒用户注意。当控制系统采取的调整措施无效，压力持续降低或升高至设定的电源切断压力下限或上限时，系统应及时切断正

压腔电源，并停止运行。

6、从上述情况看，正压防爆型式的思路不同于其它防爆型式，在控制系统和保护气体的压力，流量设计合理的情况下，正压腔的尺寸设计

灵活性较大，可生产较大体积的产品，且内装电气元件与设备可根据用户要求安装或由用户自行安装，大大增强了用户使用的可扩展性。

1.Positive pressure explosion-proof is a special type of explosion-proof. Its main guiding ideology is to isolate flammable substances from ignition sources so as to achieve the purpose of explosion-proof. The specific method is to introduce the protective gas from the safety area into the positive pressure chamber through the cooperation of the control system and the gas path system in the explosion-proof control box. After thorough cleaning and replacement of the combustible gas in the positive pressure chamber, the pressure in the positive pressure chamber can be maintained to prevent the inflammable gas and conductive dust from entering the external dangerous environment, so as to achieve the purpose of explosion-proof.

2.According to the pressure holding mode of the positive pressure chamber, it can be divided into two kinds: the positive pressure with diluted air flow and the positive pressure with leakage compensation.

3.Positive pressure with diluted air flow is the continuous flow of protective gas through the positive pressure chamber, which can take away the heat generated by the operation of internal components while meeting the explosion-proof requirements. Therefore, it is more suitable for installing some electrical components or equipment with high calorific value, such as frequency converter, soft starter, high-power thyristor, motor, etc. The disadvantage is that the required air flow is large, and the user's on-site air source needs to provide sufficient flow and pressure.

4.Positive pressure with leakage compensation is the real-time detection of the pressure in the positive pressure chamber by the control system, and the inflow and outflow of the protective gas are controlled by the solenoid valve. When the pressure of the positive pressure chamber is too low, open the intake solenoid valve to fill the air, so that the pressure rises to the working pressure range; when the pressure of the positive pressure chamber is too high, open the exhaust solenoid valve to exhaust, so that the pressure drops to the working pressure range. Because the protective gas does not flow continuously, the positive pressure housing with leakage compensation is suitable for installing low-voltage electrical components with less calorific value, such as various electrical control systems.

5.According to the requirements of national standards, positive pressure explosion-proof control cabinet must also have interlocking and alarm functions. That is, when the positive pressure chamber ventilation process is not completed or the pressure in the positive pressure chamber does not reach the working pressure range, the positive pressure chamber can not be electrified to ensure safety. When the pressure in the positive pressure chamber in operation is lower than the set alarm pressure lower or upper limit, the control system takes adjusting measures and sends out sound and light alarm to remind users to pay attention. When the adjustment measures adopted by the control system are ineffective and the pressure continues to decrease or rise to the set lower or upper cut-off pressure limit of the power supply, the system should cut off the power supply of the positive voltage chamber in time and stop operation.

6.In view of the above situation, the idea of positive pressure explosion-proof type is different from other explosion-proof type. Under the condition of reasonable pressure and flow design of control system and protective gas, the size design of positive pressure chamber is more flexible, and can produce larger volume products. Moreover, the built-in electrical components and equipment can be installed according to user's requirements or installed by users themselves, which greatly enhances the user's usability. Scalability.

防爆正压柜

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