Positive pressure controller and explosion-proof device

Abstract

The utility model provides a positive pressure controller and an explosion-proof device, and relates to the technical field of explosion-proof safety. The positive voltage controller comprises a substrate, a power supply circuit, a purging circuit, a detection circuit, a prompt circuit and a switch assembly. Wherein the power supply circuit, the purging circuit, the detection circuit, the prompt circuit and the switch assembly are arranged on the substrate; the power supply circuit is connected with the purging circuit, the detection circuit and the prompt circuit; the power supply circuit is connected with a control power supply of an external tested device through the switch assembly. The purging circuit is used for replacing gas in an electric control chamber of the tested equipment; the detection circuit is used for detecting the pressure of the electric control chamber to obtain a pressure value; wherein under the condition that the pressure value is greater than or equal to a preset value, the control power supply is conducted by the switch assembly; under the condition that the pressure value is smaller than a preset value, the prompt circuit generates a prompt signal, and the power supply circuit sends the prompt signal to external control equipment connected with the power supply circuit; and turning off the control power supply by the switch assembly.

Description

Technical Field

[0001] This application relates to the field of explosion-proof safety technology, and more specifically, to a positive pressure controller and an explosion-proof device. Background Technology

[0002] In the field of positive pressure explosion protection, positive pressure controllers have a wide range of important applications, such as flammable and explosive environments in petroleum, chemical, pharmaceutical, military, and manufacturing industries, as well as industrial sites that require high safety. They can prevent external flammable, explosive, or harmful gases, dust, etc. from entering the internal environment to protect the safety of equipment, processes, or personnel.

[0003] Existing positive pressure controllers are typically housed in explosion-proof control boxes. They check if the pressure meets the requirements, activating the power supply to the control equipment if it does, and deactivating it if the positive pressure requirement is not met. However, existing explosion-proof control boxes are bulky, difficult to install, and inconvenient to operate. Furthermore, in practical applications, a direct power outage will stop the equipment from operating. Users cannot determine whether the power outage indicates a pressure loss or equipment malfunction, requiring manual inspection and repair, thus affecting the normal use of the equipment. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a positive pressure controller and an explosion-proof device to improve the problem of poor performance of the positive pressure controller in the prior art.

[0005] In a first aspect, embodiments of this application provide a positive pressure controller, which includes: a base plate, a power supply circuit, a purge circuit, a detection circuit, an indication circuit, and a switching assembly;

[0006] The power supply circuit, the purging circuit, the detection circuit, the prompting circuit, and the switch assembly are disposed on the substrate.

[0007] The power supply circuit is connected to the purging circuit, the detection circuit, and the prompting circuit;

[0008] The power supply circuit is connected to the control power supply of the external device under test through the switching assembly;

[0009] The purging circuit is used to replace the gas in the electrical control chamber of the device under test;

[0010] The detection circuit is used to detect the pressure in the electrical control room and obtain the pressure value;

[0011] Wherein, when the pressure value is greater than or equal to a preset value, the control power supply is turned on by the switching assembly;

[0012] If the pressure value is less than the preset value, the prompting circuit generates a prompting signal and the power supply circuit sends the prompting signal to an external control device connected to the power supply circuit; and the switching assembly shuts off the control power supply.

[0013] In the above implementation process, placing multiple components on the substrate improves the integration, miniaturization, and modularity of the positive pressure controller. This effectively reduces the size of the positive pressure controller while meeting positive pressure control requirements, and also reduces the difficulty of installation and operation. A detection circuit monitors the pressure in the control room. When the pressure value is greater than or equal to a preset value, the control power is switched on via a switch assembly to achieve normal operation. When the pressure value is less than the preset value, i.e., in the event of pressure loss, a corresponding warning signal is generated by a warning circuit connected to the power supply circuit. This signal is then sent to external control equipment to alert the operator to the pressure loss in the control room. The operator can then choose whether to cut off the power in the event of pressure loss. The switch assembly only shuts off the control power when necessary. This allows for the identification of abnormal situations based on actual conditions, thus determining whether to cut off the power and effectively reducing the adverse effects of direct power outages on the normal operation of the tested equipment.

[0014] Optionally, the prompting circuit includes: a prompting device and a prompting switch;

[0015] The prompting device is connected to the detection circuit and the power supply circuit;

[0016] The notification switch connects the switch assembly and the notification device;

[0017] The prompting switch is used to activate the path of the prompting device when the pressure value is less than the preset value, and to activate the path of the switch assembly when the pressure value is greater than the preset value.

[0018] The prompting device is used to generate the prompting signal when it is turned on, and to send the prompting signal to the power supply circuit.

[0019] In the above implementation process, the prompting circuit can include corresponding prompting devices and prompting switches. The prompting device is connected to the detection circuit and the power supply circuit. The prompting device is connected to the switching assembly through the prompting switch. The prompting switch can activate the path of the prompting device when the pressure value is less than a preset value, i.e., when there is a pressure loss. In this activated state, the prompting device generates a corresponding prompting signal and sends the generated signal to the power supply circuit. The prompting switch can also activate the path of the switching assembly when the pressure value is less than a preset value, i.e., when the pressure is normal. This allows the switching assembly to activate the control power supply in the external device under test for normal positive pressure control. Different paths can be activated based on the actual pressure detection conditions to achieve different control effects.

[0020] Optionally, the positive pressure controller further includes: a time delay;

[0021] The delay unit is connected to the prompting device and the switch assembly;

[0022] The delay timer is used to control the switching assembly to delay shutting off the control power supply according to the prompt signal.

[0023] In the above implementation process, considering the safety hazards that may exist under pressure loss, a timer connected to the prompting device and the switching assembly can be set in the positive pressure controller. After the prompting device generates the corresponding prompting signal, the timer can automatically control the switching assembly to turn off the control power supply in the external device under test after a certain delay based on the prompting signal. This reduces the danger caused by pressure loss when there is no feedback for a long time, and further improves the safety of the positive pressure controller during use.

[0024] Optionally, the power supply circuit includes: a first power supply circuit and a second power supply circuit;

[0025] The first terminal of the first power supply circuit is connected to the power supply of the control device, and the second terminal of the first power supply circuit is connected to the purge circuit, the detection circuit and the prompting circuit.

[0026] The first terminal of the second power supply circuit is connected to the power supply of the control device, and the second terminal of the second power supply circuit is connected to the purging circuit, the detection circuit and the prompting circuit.

[0027] When the first terminal of the first power supply circuit is de-energized, the second power supply circuit is energized.

[0028] When the first terminal of the second power supply circuit is de-energized, the first power supply circuit is turned on.

[0029] In the above implementation process, the power supply circuit can include two branch power supply circuits. The first end of each power supply circuit is connected to the power supply of the control device, and the second end is connected to the internal circuit structure such as the purging circuit, detection circuit, and prompting circuit. When the first end of the first power supply circuit is de-energized, the second power supply circuit is energized to provide a stable operating power supply to the positive pressure controller; when the first end of the second power supply circuit is de-energized, the first power supply circuit is energized to provide a stable operating power supply to the positive pressure controller. By setting up a structure with two cross-operating power supply circuits, a stable and effective operating power supply can be provided to the positive pressure controller, effectively reducing the adverse effects of power supply circuit failure on the operation of the positive pressure controller.

[0030] Optionally, the first power supply circuit includes: a first power interface and a first controller;

[0031] The first end of the first power interface is connected to the power supply of the control device, and the second end of the first power interface is connected to the purge circuit, the detection circuit and the prompting circuit.

[0032] The first controller is connected to the second end of the first power interface and the second power circuit;

[0033] When the first terminal of the second power supply circuit is de-energized, the first controller controls the first power interface to be turned on.

[0034] In the above implementation process, the first power supply circuit may include a corresponding first power interface and a first controller. The first end of the first power interface is connected to the power supply of the control device, and the second end is connected to the internal circuit structure such as the purging circuit, the detection circuit, and the prompting circuit. The first controller is connected to the second end of the first power interface and the second power supply circuit. The first controller can determine the conduction status of the second power supply circuit. When the first end of the second power supply circuit is de-energized, it controls the first power interface to conduct, and the conducting first power supply circuit provides working power to the positive pressure controller.

[0035] Optionally, the second power supply circuit includes: a second power interface and a second controller;

[0036] The first end of the second power interface is connected to the power supply of the control device, and the second end of the second power interface is connected to the purge circuit, the detection circuit and the prompting circuit.

[0037] The second controller is connected to the second end of the second power interface and the first power circuit;

[0038] When the first terminal of the first power circuit is de-energized, the second controller controls the second power interface to be turned on.

[0039] In the above implementation process, the second power supply circuit may include a corresponding second power interface and a second controller. The first end of the second power interface is connected to the power supply of the control device, and the second end is connected to the internal circuit structure such as the purging circuit, detection circuit and prompting circuit. The second controller is connected to the second end of the second power interface and the first power circuit. The second controller can determine the conduction status of the first power circuit. When the first end of the first power circuit is de-energized, it controls the second power interface to conduct, and the conducted second power circuit provides working power to the positive pressure controller.

[0040] Optionally, the purging circuit includes: a starter and a purging device;

[0041] The starter is connected to the power circuit and the purging device;

[0042] The starter is used to activate the purging device based on the start signal from the power supply circuit.

[0043] The purging end of the purging device is positioned facing the electrical control room.

[0044] In the above implementation process, the purging circuit for gas replacement can include a corresponding starter and a purging device. The purging device and the power supply circuit are connected through the starter. The starter can receive a start signal sent by the power supply circuit and activate the purging device based on the start signal. The purging device, with its purging end facing the control room, achieves gas replacement through purging. It can quickly respond to the start signal to perform purging, effectively improving the efficiency of gas replacement.

[0045] Optionally, the purging device further includes: a timer;

[0046] The timer is connected to the purging device;

[0047] The timer is used to turn the purging device on / off based on a set working time.

[0048] In the above implementation process, a timer connected to the purging device is installed. The timer stores the corresponding working time and starts and stops the purging operation of the purging device based on the start signal sent by the starter. This allows for timed control of the purging operation of the purging device, further improving the effectiveness of the purging work.

[0049] Optionally, the detection circuit includes: a pressure detector and a pressure switch;

[0050] The pressure switch is connected to the pressure detector, the indication circuit, and the switch assembly;

[0051] The pressure detector is used to detect the pressure in the electrical control room and obtain the pressure value;

[0052] Wherein, when the pressure value is greater than or equal to a preset value, the pressure switch activates the switching assembly;

[0053] If the pressure value is less than the preset value, the pressure switch activates the indication circuit.

[0054] In the above implementation process, the detection circuit may include a pressure detector and a pressure switch. The pressure switch is connected to the pressure detector, the indicator circuit, and the switching assembly. The pressure detector detects the pressure in the electrical control room of the device under test and obtains the corresponding pressure value. When the pressure value is greater than or equal to a preset value, i.e., normal pressure, the pressure switch activates the circuit containing the switching assembly, thereby activating the control voltage of the device under test for normal positive pressure control. When the pressure value is less than the preset value, i.e., pressure loss, the pressure switch activates the indicator circuit to generate a corresponding indicator signal to alarm and alert in case of pressure loss.

[0055] Secondly, embodiments of this application also provide an explosion-proof device, the device including the positive pressure controller described in any of the above claims.

[0056] In summary, the embodiments of this application provide a positive pressure controller and an explosion-proof device, which can alert the operator to the pressure loss detected in the electrical control room of the equipment under test. This allows the operator to choose whether to cut off the power in the event of pressure loss, and to shut down the power only when necessary. The system can determine the corresponding abnormal situation based on the actual situation, thereby determining whether to cut off the power and effectively reducing the adverse effects of direct power-off on the normal use of the equipment under test. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of a positive pressure controller provided in an embodiment of this application;

[0059] Figure 2 This is a detailed structural diagram of a positive pressure controller provided in an embodiment of this application.

[0060] Icons: 100-Substrate; 200-Power supply circuit; 300-Purge circuit; 400-Detection circuit; 500-Indication circuit; 600-Switch assembly; A-DUT; B-Control device; 510-Indication device; 520-Indication switch; 530-Delay timer; 210-First power supply circuit; 211-First power interface; 212-First controller; 220-Second power supply circuit; 221-Second power interface; 222-Second controller; 310-Starting element; 320-Purge device; 330-Timer; 410-Pressure detector; 420-Pressure switch. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0062] Currently, positive pressure controllers are typically housed in explosion-proof control boxes. They check whether the pressure meets the requirements, activating the power supply to the control equipment if it does, and disconnecting the power if the positive pressure requirement is not met. However, existing explosion-proof control boxes are bulky, difficult to install, and inconvenient to operate. Furthermore, in practical applications, a direct power outage will stop the equipment from operating, making it impossible for users to determine whether the outage indicates a pressure loss or equipment malfunction. This necessitates manual inspection and maintenance, impacting the normal operation of the equipment.

[0063] To address the aforementioned issues, this application provides a positive pressure controller, which is housed within a corresponding explosion-proof device. This explosion-proof device can be a corresponding explosion-proof control device, explosion-proof enclosure, or the like. Since the positive pressure controller of this application is integrated onto a corresponding substrate, both the positive pressure controller and the explosion-proof device are relatively small in size, effectively reducing the difficulty of installation and operation.

[0064] Please see Figure 1 , Figure 1 This is a schematic diagram of a positive pressure controller provided in an embodiment of this application. The positive pressure controller may include: a base plate 100, a power supply circuit 200, a purging circuit 300, a detection circuit 400, a prompting circuit 500, and a switch assembly 600.

[0065] Among them, the power supply circuit 200, the purging circuit 300, the detection circuit 400, the prompting circuit 500 and the switch assembly 600 are all mounted on the substrate 100. The substrate 100 can be set as a corresponding PCB (Printed Circuit Board) board or other circuit substrate, and multiple circuit modules with different functions can be mounted on the substrate 100 by means of pin soldering.

[0066] The power supply circuit 200 is connected to the purge circuit 300, the detection circuit 400 and the indication circuit 500 to provide the power required for the operation of the purge circuit 300, the detection circuit 400 and the indication circuit 500. The power supply circuit 200 is connected to the control power supply of the external device under test A through the switch assembly 600 to control the control power supply of the device under test A, thereby realizing the explosion-proof function.

[0067] The purging circuit 300 is used to replace the gas in the electrical control room of the device under test A, thereby replacing flammable and explosive hazardous gases in the electrical control room, isolating the flammable gases from ignition sources, and introducing protective gas from a safe area into the electrical control room. After cleaning and replacing the flammable gases in the electrical control room, a certain pressure is maintained in the electrical control room to prevent the entry of flammable gases and conductive dust from the external hazardous environment, thus achieving the purpose of explosion protection. Considering the influence of pressure, in order to detect whether the pressure in the electrical control room is stable, the detection circuit 400 can perform pressure detection on the electrical control room after purging to obtain the corresponding pressure value.

[0068] It should be noted that a suitable preset value can be selected in advance as the threshold for pressure detection based on historical explosion-proof data or actual needs. For example, the preset value can be set to 50 Pa. If the pressure value is greater than or equal to the preset value, it indicates that the pressure in the electrical control room is normal, and the switch assembly 600 can be used to turn on the control power to achieve normal operation. If the pressure value is less than the preset value, it indicates that there is a pressure loss in the electrical control room. The prompting circuit 500 can generate a prompt signal, and the power supply circuit 200 can send a prompt signal to the external control device B connected to the power supply circuit 200 to inform the staff of the pressure loss in the electrical control room. The staff can then choose whether to cut off the power in the case of pressure loss. When power cutting is required, the switch assembly 600 turns off the control power, thereby cutting off the power to the tested device A.

[0069] Optionally, the device under test A can be an electrical device that needs to be tested for explosion-proof safety, such as a power supply box, etc. The control device B can be a corresponding electronic device with control functions, such as a server, personal computer (PC), tablet computer, smartphone, personal digital assistant (PDA), etc., which are electronic devices with logic calculation functions. The positive pressure controller can be directly installed inside the control device B as a module of the control device B. The positive pressure controller can also be electrically connected to the control device B through a cable so that the control device B can perform power supply, on / off and other control processes for the positive pressure controller.

[0070] It should be noted that the purge circuit 300, detection circuit 400 and prompting circuit 500 can all be configured as modular circuits with corresponding functions. Each modular circuit can include various corresponding devices and circuit wiring. For example, the purge circuit 300 can include a corresponding purge solenoid valve, the detection circuit 400 can include a corresponding pressure detector 410, differential pressure detector, etc., and the prompting circuit 500 can include corresponding buzzers, indicator lights and other devices with prompting functions.

[0071] It should be noted that in the event of a pressure loss, staff can choose to turn off the control power supply or not, based on the prompts and the actual situation. For example, if the pressure loss is short and the pressure quickly returns to normal, the control power supply can remain on so that the tested device A can continue to function normally. If the pressure loss is prolonged and the pressure does not return to normal, the control power supply should be turned off to reduce the risk of combustion, explosion, or other adverse events.

[0072] For example, the switch assembly 600 can be configured as a corresponding power switch circuit to turn the control power supply of the device under test A on or off by means of the circuit's conduction.

[0073] exist Figure 1 In the illustrated embodiment, the corresponding abnormal situation can be determined based on the actual situation, thereby determining whether to perform a power outage, effectively reducing the adverse effects of direct power outage on the normal use of the device under test A.

[0074] Optionally, please refer to Figure 2 , Figure 2 This is a detailed structural diagram of a positive pressure controller provided in an embodiment of this application.

[0075] Optionally, the prompting circuit 500 may include a prompting device 510 and a prompting switch 520. The prompting device 510 is connected to the detection circuit 400 and the power supply circuit 200, and the prompting switch 520 is connected to the switch assembly 600 and the prompting device 510. The prompting switch 520 is used to activate the path of the prompting device 510 when the pressure value is less than a preset value, and to activate the path of the switch assembly 600 when the pressure value is greater than the preset value. The prompting device 510 generates a prompt signal when activated and sends the signal to the power supply circuit 200. The prompting switch 520 can activate the path of the prompting device 510 when the pressure value is less than the preset value (i.e., underpressure), thereby generating a corresponding prompt signal and sending it to the power supply circuit 200. The prompting switch 520 can also activate the path of the switch assembly 600 when the pressure value is less than the preset value (i.e., normal pressure), thereby allowing the switch assembly 600 to connect the control power supply in the external device under test A for normal positive pressure control. It can activate different pathways based on the actual pressure detection to achieve different control effects.

[0076] For example, the prompting device 510 can be configured as a corresponding buzzer, indicator light, or other device with prompting function. The generated prompting signal can include an audible and visual signal and / or a corresponding electrical signal. The audible and visual signal can prompt the staff of an abnormal pressure loss, and the electrical signal can record the abnormal situation.

[0077] Optionally, the prompt switch 520 can be a corresponding electrical closing switch, with the first contact of the prompt switch 520 connected to the prompt device 510 and the second contact connected to the switch assembly 600 when the switch is closed.

[0078] Optionally, considering the safety hazards posed by pressure loss, the positive pressure controller may further include a timer 530. The timer 530 is connected to the indicator device 510 and the switch assembly 600. The timer 530 is used to control the switch assembly 600 to delay and shut off the control power supply based on the indicator signal. By configuring the timer 530 connected to the indicator device 510 and the switch assembly 600 in the positive pressure controller, after the indicator device 510 generates a corresponding indicator signal, the timer 530 can automatically control the switch assembly 600 to shut off the control power supply in the external device under test A after a certain delay, thereby reducing the risk of danger caused by pressure loss in the event of prolonged lack of feedback from the indicator signal and further improving the safety of the positive pressure controller during use.

[0079] Optionally, the delay unit 530 can be set as a corresponding delay timer, which can store a corresponding delay time. The delay time can be set and modified according to the actual situation and needs. After the set delay time is reached, the delay timer will trigger the corresponding control time. For example, after the prompting device 510 generates a prompt signal for 5 seconds, the delay unit 530 will control the switching component 600 to turn off the control power.

[0080] For example, the delay unit 530 can achieve precise time control through the charging and discharging process of a capacitor or inductor. The delay unit 530 may internally include components such as a comparator, voltage divider resistors, capacitors or inductors, triggers, and a regulated power supply. When the delay unit 530 is activated, the capacitor or inductor begins to charge and discharge. Once a preset voltage or current threshold is reached, the comparator sends a signal to trigger the circuit to operate, completing the delay task.

[0081] Optionally, considering that abnormal situations during power supply may affect the normal detection and control operation of the positive pressure controller, the power supply circuit 200 may include: a first power supply circuit 210 and a second power supply circuit 220.

[0082] In this circuit, the first terminal of the first power supply circuit 210 is connected to the power supply of the control device B, and the second terminal of the first power supply circuit 210 is connected to the purge circuit 300, the detection circuit 400, and the indication circuit 500. The first terminal of the second power supply circuit 220 is connected to the power supply of the control device B, and the second terminal of the second power supply circuit 220 is connected to the purge circuit 300, the detection circuit 400, and the indication circuit 500. The power supply circuit 200 may include two branch power supply circuits 200, with the first terminal of each branch power supply circuit 200 connected to the power supply of the control device B, and the second terminal connected to the internal circuit structures such as the purge circuit 300, the detection circuit 400, and the indication circuit 500.

[0083] It should be noted that when the first terminal of the first power supply circuit 210 is de-energized, the second power supply circuit 220 is energized, and when the first terminal of the second power supply circuit 220 is de-energized, the first power supply circuit 210 is energized. When the first terminal of the first power supply circuit 210 is de-energized, the second power supply circuit 220 is energized to provide a stable operating power supply to the positive pressure controller; when the first terminal of the second power supply circuit 220 is de-energized, the first power supply circuit 210 is energized to provide a stable operating power supply to the positive pressure controller. By setting up a structure with two cross-operating power supply circuits 200, a stable and effective operating power supply to the positive pressure controller is ensured, effectively reducing the adverse effects of power supply circuit 200 failure on the operation of the positive pressure controller.

[0084] Optionally, the first power supply circuit 210 may include a first power interface 211 and a first controller 212. The first end of the first power interface 211 is connected to the power supply of the control device B, and the second end of the first power interface 211 is connected to the purge circuit 300, the detection circuit 400, and the indication circuit 500. The first controller 212 is connected to the second end of the first power interface 211 and the second power supply circuit 220. When the first end of the second power supply circuit 220 is de-energized, the first controller 212 controls the first power interface 211 to conduct. The first controller 212 can determine the conduction status of the second power supply circuit 220. When the first end of the second power supply circuit 220 is de-energized, it controls the first power interface 211 to conduct, and the conducting first power supply circuit 210 provides operating power to the positive pressure controller.

[0085] Optionally, the second power supply circuit 220 may include a second power interface 221 and a second controller 222. The first end of the second power interface 221 is connected to the power supply of the control device B, and the second end of the second power interface 221 is connected to the purge circuit 300, the detection circuit 400, and the indication circuit 500. The second controller 222 is connected to the second end of the second power interface 221 and the first power circuit 210. When the first end of the first power circuit 210 is de-energized, the second controller 222 controls the second power interface 221 to conduct. The second controller 222 can determine the conduction status of the first power circuit 210 and, when the first end of the first power circuit 210 is de-energized, controls the second power interface 221 to conduct, so that the conducted second power circuit 220 provides operating power to the positive pressure controller.

[0086] For example, the first controller 212 and the second controller 222 can be configured as corresponding voltage detectors, which can detect the voltage in the other power supply circuit 200 to determine the conduction status of the power supply circuit 200, and then control the corresponding power interface to be turned on or off according to the conduction status.

[0087] Optionally, to achieve the corresponding gas replacement function, the purging circuit 300 may include a starter 310 and a purging device 320. The starter 310 is connected to the power supply circuit 200 and the purging device 320. The starter 310 is used to activate the purging device 320 based on the start signal from the power supply circuit 200. The purging device 320 and the power supply circuit 200 are connected through the starter 310. The starter 310 can receive the start signal sent by the power supply circuit 200 and activate the purging device 320 based on the start signal. This allows for rapid response to the start signal to perform purging operations, effectively improving the efficiency of gas replacement.

[0088] For example, the purging device 320 may include a device with purging and ventilation functions, such as a corresponding purging solenoid valve, and the starting device 310 may be a device such as a corresponding starting relay.

[0089] It should be noted that the purging end of the purging device 320 is oriented towards the electrical control room to perform normal purging and ventilation treatment of the electrical control room.

[0090] Optionally, the purging device 320 may further include a timer 330, which is connected to the purging device 320 and used to turn the purging device 320 on / off based on a set working time. The working time can be set and modified according to actual conditions and needs; for example, it can be set to 10 minutes. The timer 330 can store corresponding timing instructions and working times internally to start and time-lapse the purging operation of the purging device 320 based on a start signal sent by the starter 310 (e.g., automatically shutting off after 10 minutes). This allows for timed control of the purging operation of the purging device 320, further improving the effectiveness of the purging operation.

[0091] For example, the structure of timer 330 is similar to that of delayer 530, and will not be described in detail again.

[0092] Optionally, to achieve normal pressure detection, the detection circuit 400 may include a pressure detector 410 and a pressure switch 420. The pressure switch 420 connects the pressure detector 410, the indication circuit 500, and the switch assembly 600. The pressure detector 410 detects the pressure in the control room and obtains the pressure value. When the pressure value is greater than or equal to a preset value, the pressure switch 420 activates the switch assembly 600; when the pressure value is less than the preset value, the pressure switch 420 activates the indication circuit 500. The pressure detector 410 can detect the pressure in the control room of the device under test A and obtain the corresponding pressure value. When the pressure value is greater than or equal to the preset value (i.e., normal pressure), the pressure switch 420 activates the circuit containing the switch assembly 600, thereby activating the control voltage of the device under test A for normal positive pressure control. When the pressure value is less than the preset value (i.e., pressure loss), the pressure switch 420 activates the indication circuit 500 to generate a corresponding indication signal to alarm and alert in case of pressure loss.

[0093] For example, the pressure detector 410 may include a pressure detection chip and a signal processing unit. The pressure detection chip can quickly respond to pressure changes in the control room and convert them into electrical signals. The signal processing unit amplifies, filters, and converts the electrical signals to obtain data in the corresponding signal format as the pressure value. Considering the influence of temperature on pressure, the pressure detector 410 may also be equipped with a corresponding temperature control unit to regulate the internal temperature of the control room, keeping the internal temperature within a stable range and further reducing the adverse effects of temperature changes on pressure detection.

[0094] Optionally, the pressure switch 420 can be configured as a corresponding electrical double-pole switch, with the first end of the pressure switch 420 connected to the pressure detector 410 and the second end connected to the indication circuit 500 or the switch assembly 600, so as to achieve different functions by conducting different circuits through the pressure switch 420.

[0095] In addition, the components in the various embodiments of this application can be integrated together to form an independent part, or each component can exist independently, or two or more components can be integrated to form an independent part.

[0096] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0097] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0098] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

Claims

1. A positive pressure controller characterized by, The positive pressure controller comprises a substrate, a power supply circuit, a purge circuit, a detection circuit, a prompt circuit and a switch assembly; The power supply circuit, the purge circuit, the detection circuit, the prompt circuit and the switch assembly are arranged on the substrate; The power supply circuit is connected with the purge circuit, the detection circuit and the prompt circuit; The power supply circuit is connected with the control power supply of the external measured device through the switch assembly; The purge circuit is used for replacing the gas in the electric control chamber of the measured device; The detection circuit is used for detecting the pressure of the electric control chamber to obtain a pressure value; In the case that the pressure value is greater than or equal to a preset value, the control power supply is turned on by the switch assembly; In the case that the pressure value is less than the preset value, a prompt signal is generated by the prompt circuit, the prompt signal is sent to the external control device connected with the power supply circuit by the power supply circuit, and the control power supply is turned off by the switch assembly.

2. The positive pressure controller of claim 1, wherein, The prompt circuit comprises a prompt device and a prompt switch; The prompt device is connected with the detection circuit and the power supply circuit; The prompt switch is connected with the switch assembly and the prompt device; The prompt switch is used for turning on the path of the prompt device in the case that the pressure value is less than the preset value, and turning on the path of the switch assembly in the case that the pressure value is greater than the preset value; The prompt device is used for generating the prompt signal and sending the prompt signal to the power supply circuit in the case that the path is turned on. The positive pressure controller further comprises a time delay device; 3. The positive pressure controller of claim 2, wherein, The time delay device is connected with the prompt device and the switch assembly; The time delay device is used for controlling the switch assembly to delay turning off the control power supply according to the prompt signal. The power supply circuit comprises a first power supply circuit and a second power supply circuit; 4. The positive pressure controller of claim 1, wherein, The first end of the first power supply circuit is connected with the power supply of the control device, and the second end of the first power supply circuit is connected with the purge circuit, the detection circuit and the prompt circuit; The first end of the second power supply circuit is connected with the power supply of the control device, and the second end of the second power supply circuit is connected with the purge circuit, the detection circuit and the prompt circuit; In the case that the first end of the first power supply circuit is powered off, the second power supply circuit is turned on; In the case that the first end of the second power supply circuit is powered off, the first power supply circuit is turned on. The first power supply circuit comprises a first power supply interface and a first controller; The first end of the first power supply interface is connected with the power supply of the control device, and the second end of the first power supply interface is connected with the purge circuit, the detection circuit and the prompt circuit; 5. The positive pressure controller of claim 4, wherein, The first controller is connected with the second end of the first power supply interface and the second power supply circuit; In the case that the first end of the second power supply circuit is powered off, the first controller controls the first power supply interface to be turned on. The second power supply circuit comprises a second power supply interface and a second controller; ​ ​ 6. The positive pressure controller of claim 4, wherein, ​ ​ A first end of the second power interface is connected with a power supply of the control device, and a second end of the second power interface is connected with the purge circuit, the detection circuit and the prompt circuit; The second controller is connected with the second end of the second power interface and the first power circuit; In a case where the first end of the first power circuit is powered off, the second controller controls the second power interface to be turned on.

7. The positive pressure controller according to any one of claims 1-6, wherein, In the application, The purge circuit comprises a starting component and a purge component; The starting component is connected with the power circuit and the purge component; The starting component is configured to start the purge component based on a starting signal of the power circuit; The purge end of the purge component is arranged towards the electric control chamber.

8. The positive pressure controller of claim 7, wherein, In the application, The purge component further comprises a timer; The timer is connected with the purge component; The timer is configured to start / close the purge component based on a set working time.

9. The positive pressure controller of any one of claims 1-5, wherein, In the application, The detection circuit comprises a pressure detector and a pressure switch; The pressure switch is connected with the pressure detector, the prompt circuit and the switch assembly; The pressure detector is configured to detect a pressure condition of the electric control chamber to obtain the pressure value; In a case where the pressure value is greater than or equal to a preset value, the switch assembly is turned on by the pressure switch; In a case where the pressure value is less than the preset value, the prompt circuit is turned on by the pressure switch.

10. An explosion protection device, characterized in that The device comprises the positive pressure controller according to any one of claims 1-9.

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