Dehumidification type explosion-proof box for electric control system

Abstract

The utility model relates to a dehumidification type explosion-proof box for an electric control system, which comprises a box body, and a dehumidification system is arranged in the box body. The dehumidification system comprises a dehumidifier, a humidity sensor, a time controller and a water drainage pipeline, the humidity sensor and the time controller are both in communication connection with the dehumidifier, the water drainage pipeline is connected with a water drainage opening of the dehumidifier and penetrates through the box body to extend out of the box body, and an electromagnetic valve controlled by the time controller to work is installed on the water drainage pipeline; the part, penetrating through the box body, of the drainage pipeline is an anti-explosion cable gland. According to the utility model, the interior of the explosion-proof box is dehumidified, and when the humidity in the box body is higher than the environmental humidity value required by normal work of electrical elements, the dehumidifier is started to dehumidify the interior of the box body to reduce the internal humidity value, and meanwhile, condensate water generated by dehumidification can be discharged out of the box body through the drainage pipeline; therefore, the humidity value in the box body is always maintained in a normal range, and the service life of the electric control system is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof boxes, in particular to a dehumidification-type explosion-proof box for an electric control system. Background Art

[0002] The electronic control system used with mechanical hydraulic products mainly includes sensors, PLC control units, solenoid valves and other electrical components. When used in oil field operations, the electronic control system must be explosion-proof. Sensors and solenoid valves can be installed in mechanical equipment products in an explosion-proof form, while PLC control units and other electrical components are non-explosion-proof and need to be explosion-proof. The current common design is to place these non-explosion-proof electrical components in an explosion-proof box. The cables inside the explosion-proof box are connected to the external explosion-proof sensor or explosion-proof solenoid valve through the external explosion-proof interface of the explosion-proof box, so that the entire electronic control system meets the explosion-proof requirements of oil field field applications.

[0003] When the existing explosion-proof box is used in a high temperature and high humidity environment, the seals gradually fail after long-term use, external humid gas enters the explosion-proof box, and the internal air produces condensed water attached to the inner box wall. This causes more water droplets to adhere to the inside of the explosion-proof box. If the explosion-proof box is frequently opened, external air or mold will also enter, resulting in the production of green mold substances. The falling of water droplets or the long-term humid environment inside the explosion-proof box will increase the conductivity of the air, thereby causing a short circuit in the electrical connection part, resulting in system failure, and the mold phenomenon will greatly reduce the reliability and life of the electrical components, and eventually cause the failure or malfunction of the electric control components in the explosion-proof box. In order to ensure the application of the product in a high temperature and high humidity environment, it is necessary to completely isolate the entry of external gas and ensure that the seal is permanently effective. This requires the use of positive pressure technology inside the explosion-proof box and the selection of high-cost seals, which will greatly increase the cost and volume of the explosion-proof box. To this end, the present application proposes a dehumidification explosion-proof box for an electric control system. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a dehumidification explosion-proof box for an electric control system, which automatically monitors and controls the humidity inside the explosion-proof box, so that the electrical components in the explosion-proof box can always work within a normal humidity range, avoiding the generation of condensed water and thus ensuring the service life of the product. The specific technical solution is as follows:

[0005] A dehumidification explosion-proof box for an electric control system comprises a box body, in which a dehumidification system is arranged; the dehumidification system comprises a dehumidifier, a humidity sensor, a time controller and a drainage pipeline, the humidity sensor and the time controller are both communicatively connected with the dehumidifier, the drainage pipeline is connected with the drainage port of the dehumidifier and extends to the outside of the box body through the box body, an electromagnetic valve controlled by the time controller is installed on the drainage pipeline, and the portion of the drainage pipeline passing through the box body is an explosion-proof gland.

[0006] Furthermore, the dehumidifier is a semiconductor refrigeration dehumidifier.

[0007] Furthermore, the humidity sensor is installed on the side wall inside the box.

[0008] Furthermore, the dehumidification system also includes an indicator light that is communicatively connected to the dehumidifier.

[0009] Furthermore, the box is a flameproof aluminum alloy box for installing electronic components of the electric control system.

[0010] Furthermore, the drainage pipeline includes an internal drainage pipe and an external drainage pipe. One end of the internal drainage pipe is connected to the water outlet of the dehumidifier, and the other end of the internal drainage pipe is connected to the water inlet of the solenoid valve through pipe joint I. The water outlet of the solenoid valve is connected to the explosion-proof gland through pipe joint II, and the other end of the explosion-proof gland is connected to the external drainage pipe.

[0011] Furthermore, the external drain pipe is made of hard material.

[0012] Furthermore, the dehumidifier, the time controller and the solenoid valve are connected to the power supply system through a circuit breaker.

[0013] The beneficial effects of the utility model are:

[0014] For dehumidification inside the explosion-proof box, when the humidity inside the box is higher than the ambient humidity value required for the normal operation of the electrical components, the dehumidifier starts to dehumidify the inside of the box to reduce the internal humidity value. At the same time, the condensed water generated by dehumidification can be discharged to the outside of the box through the drainage pipe, so that the humidity value inside the box is always maintained within the normal range.

[0015] The dehumidification system contains few components and has low cost. It can be selected according to different application environments. While meeting the explosion-proof and high-temperature and high-humidity application requirements of the control system products, it reduces the modification and upgrade costs of the explosion-proof box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] 1. Figure 1 It is a structural schematic diagram of a dehumidification explosion-proof box for an electric control system of the utility model;

[0018] 2. Figure 2 It is a schematic diagram of a dehumidification system of a dehumidification-type explosion-proof box for an electric control system according to the utility model.

[0019] In the figure: 101, box body; 102, cables in the electric control system; 103, indicator light; 104, circuit breaker; 105, humidity sensor; 106, connecting wire; 107, dehumidifier; 108, internal drainage pipe; 109, pipe joint I; 110, pipe joint II; 111, time controller; 112, solenoid valve; 113, explosion-proof gland; 114, external drainage pipe; 115, cables outside the electric control system; 116, fixing bracket. DETAILED DESCRIPTION

[0020] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0021] The utility model provides the following specific embodiments of the dehumidification explosion-proof box for the electric control system:

[0022] Embodiment 1:

[0023] like Figure 1-2As shown, a dehumidification explosion-proof box for an electric control system includes a box body 101, which is composed of a shell body with an opening forward and a reversible cover arranged on the front side of the shell body. A dehumidification system is arranged in the box body 101; the dehumidification system includes a dehumidifier 107, a humidity sensor 105, a time controller 111 and a drainage pipeline. The dehumidifier 107 is installed in the box body 101 through a fixed bracket 116, and the humidity sensor 105 and the time controller 111 are both connected to the dehumidifier 107 for communication; the dehumidifier 107 automatically dehumidifies according to the set upper and lower humidity limits. When the humidity is The device automatically starts when the humidity is higher than the upper limit, and stops when the humidity is lower than the lower limit; the drainage pipeline is connected to the drainage outlet of the dehumidifier 107 and extends through the box 101 to the outside of the box 101, and a solenoid valve 112 controlled by a time controller 111 is installed on the drainage pipeline; the time controller 111 controls the solenoid valve 112 according to the set drainage time and drainage interval, and automatically opens the solenoid valve 112 at a certain interval and then closes it after a period of time, and repeats this process; the part of the drainage pipeline that passes through the box 101 is an explosion-proof gland 113.

[0024] Preferably, the dehumidifier 107 is a semiconductor refrigeration dehumidifier, which, compared with the traditional air-cooled dehumidification, can work continuously for a long time, quickly condense and dehumidify, and quickly convert moisture into condensed water.

[0025] Preferably, since the humidity changes more obviously at the inner wall of the box 101, the humidity sensor 105 is installed on the side wall inside the box 101, and the humidity sensor 105 is connected to the sensor connection end on the dehumidifier 107 through the connecting line 106. The humidity sensor 105 is used to detect the humidity value inside the box 101 and send the value to the dehumidifier 107 through an electrical signal; the connecting line 106 reserves an RS485 connection terminal to be connected to the terminal block for backup.

[0026] Preferably, the dehumidification system also includes an indicator light 103 that is communicatively connected to the dehumidifier 107. The indicator light 103 is installed on the cover of the box 101. The working status output port of the dehumidifier 107 is connected to the indicator light 103. The indicator light 103 is on when the dehumidification is working, and is off when the dehumidification is not working, thereby serving as a reminder.

[0027] Preferably, the box 101 is a flameproof aluminum alloy box 101, which is used to install the electronic components of the electric control system, which are connected together through the cables 102 inside the electric control system, and the cables 115 outside the electric control system enter and exit through the explosion-proof wiring ports at the upper and lower parts of the box 101.

[0028] Preferably, the drainage pipeline includes an internal drainage pipe 108 and an external drainage pipe 114, one end of the internal drainage pipe 108 is connected to the water outlet of the dehumidifier 107, the other end of the internal drainage pipe 108 is connected to the water inlet of the solenoid valve 112 through a pipe joint Ⅰ109, the water outlet of the solenoid valve 112 is connected to the explosion-proof gland 113 through a pipe joint Ⅱ110, and the other end of the explosion-proof gland 113 is connected to the external drainage pipe 114; the external drainage pipe 114 is made of hard material, which is convenient for use with the explosion-proof gland 113 to ensure compliance with explosion-proof requirements.

[0029] Preferably, a 220V power supply is introduced as the power supply system through an external cable 115 of the electric control system. The power supply system is divided into two paths, one path is used to power the electric control system, and the other path is connected to the input end of the circuit breaker 104. The dehumidifier 107, the time controller 111 and the solenoid valve 112 are connected to the output end of the circuit breaker 104; the main function of the circuit breaker 104 is to protect the power supply of the electric control system. When a short circuit occurs in an electrical component in the dehumidification system, the power supply of the dehumidification system can be automatically cut off, thereby not affecting the normal power supply of the electric control system.

[0030] In this embodiment, the valve body electrical component of the solenoid valve 112 is connected to the time controller 111, and the time controller 111 is connected to the output activation terminal on the dehumidifier 107 through the connecting line 106; the dehumidifier 107 has a built-in temperature sensor, and the panel can simultaneously display the temperature value and humidity value inside the box 101. The lower limit value and the upper limit value of the humidity can be set by the buttons on the operation panel. This embodiment is set according to the requirements of the most important PLC control unit in the electric control system for the working environment humidity and retains sufficient margin. Specifically, the upper limit value of the humidity is 65%, and the lower limit value of the humidity is 30%, when the humidity value in the box 101 is greater than the set humidity upper limit of 65%, the dehumidifier 107 starts working, and when the humidity value inside the box 101 is less than the set humidity lower limit of 30%, the dehumidifier 107 stops working; there are two adjustment knobs on the panel of the time controller 111, one knob is used to set the drainage time, which can be set to any value in the range of 0.5-10 seconds. In this embodiment, the drainage time is set to 5S, and the other knob is used to set the drainage interval time, which can be set to any value in the range of 0.5-45 minutes. In this embodiment, the drainage interval is set to 2 minutes. When the dehumidifier 107 starts working, an activation signal is sent to the time controller 111, and the time controller 111 starts to control the solenoid valve 112 to open or close according to the set value. In this embodiment, the solenoid valve 112 is first opened and maintained for 5 seconds from the beginning of activation, and then the solenoid valve 112 is closed, and the timing is started. After the timing reaches 2 minutes, the solenoid valve 112 is opened again and the aforementioned steps are repeated, that is, during the activation period, the time controller 111 controls the solenoid valve 112 to open and maintain for 5 seconds every 2 minutes. When the dehumidifier 107 stops working, the activation signal disappears synchronously. At this time, the time controller 111 will also stop working, and the solenoid valve 112 will always be in a closed state.

[0031] Regarding dehumidification inside the explosion-proof box, when the humidity inside the box 101 is higher than the ambient humidity value required for the normal operation of the electrical components, the dehumidifier 107 starts to dehumidify the inside of the box 101 to reduce the internal humidity value. At the same time, the condensed water generated by dehumidification can be discharged to the outside of the box 101 through the drainage pipe, so that the humidity value inside the box 101 is always maintained within a normal range.

[0032] The dehumidification system contains few components and has low cost. It can be selected according to different application environments. While meeting the explosion-proof and high-temperature and high-humidity application requirements of the control system products, it reduces the modification and upgrade costs of the explosion-proof box.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A dehumidification explosion-proof box for an electric control system, characterized in that: It comprises a box body (101), wherein a dehumidification system is arranged in the box body (101); The dehumidification system comprises a dehumidifier (107), a humidity sensor (105), a time controller (111) and a drainage pipeline. The humidity sensor (105) and the time controller (111) are both communicatively connected to the dehumidifier (107). The drainage pipeline is connected to a drainage port of the dehumidifier (107) and passes through a housing (101) to extend outside the housing (101). A solenoid valve (112) controlled by the time controller (111) is installed on the drainage pipeline. The portion of the drainage pipeline that passes through the housing (101) is an explosion-proof gland (113).

2. The dehumidification explosion-proof box for an electric control system according to claim 1, characterized in that: The dehumidifier (107) is a semiconductor refrigeration dehumidifier.

3. The dehumidification explosion-proof box for an electric control system according to claim 1, characterized in that: The humidity sensor (105) is installed on the side wall inside the box (101).

4. The dehumidification explosion-proof box for an electric control system according to claim 1, characterized in that: The dehumidification system also includes an indicator light (103) that is communicatively connected to the dehumidifier (107).

5. The dehumidification explosion-proof box for an electric control system according to claim 1, characterized in that: The box (101) is a flameproof aluminum alloy box (101) and is used to install electronic components of the electric control system.

6. The dehumidification explosion-proof box for an electric control system according to claim 1, characterized in that: The drainage pipeline comprises an internal drainage pipe (108) and an external drainage pipe (114); one end of the internal drainage pipe (108) is connected to the water outlet of the dehumidifier (107); the other end of the internal drainage pipe (108) is connected to the water inlet of the solenoid valve (112) via a pipe joint I (109); the water outlet of the solenoid valve (112) is connected to the explosion-proof gland (113) via a pipe joint II (110); the other end of the explosion-proof gland (113) is connected to the external drainage pipe (114).

7. The dehumidification explosion-proof box for an electric control system according to claim 6, characterized in that: The external drain pipe (114) is made of a hard material.

8. A dehumidification explosion-proof box for an electric control system according to any one of claims 1 to 7, characterized in that: The dehumidifier (107), the time controller (111) and the solenoid valve (112) are connected to the power supply system via the circuit breaker (104).

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