A climate environment test box liquid nitrogen safety control system

Abstract

The present application belongs to the technical field of test chamber safety control, and specifically discloses a kind of climatic environment test chamber liquid nitrogen safety control system.The climatic environment test chamber liquid nitrogen safety control system includes: climatic environment test chamber, chamber oxygen concentration measuring system, chamber oxygen concentration measuring system, door machine interlock control system, chamber pressure control system, air replacement system;Chamber oxygen concentration measuring system is used to measure the oxygen concentration inside the test chamber;Chamber oxygen concentration measuring system is used to measure the oxygen concentration in the area where the test chamber door is located;Door machine interlock control system is used to control the opening and closing state of the chamber door based on oxygen concentration;Chamber pressure control system is used to adjust and control the pressure inside the test chamber to be in a stable equilibrium state;Air replacement system is used to remove nitrogen inside the test chamber.The present application solves the technical problem that the existing climate test chamber liquid nitrogen cannot achieve all-round safety control.

Description

Technical Field

[0001] This invention belongs to the technical field of test chamber safety control, specifically relating to a liquid nitrogen safety control system for a climate environment test chamber. Background Technology

[0002] Currently, mainstream equipment manufacturers and laboratories for climate experiments both domestically and internationally have limited means of controlling the safety of liquid nitrogen. The conventional approach is to monitor the oxygen concentration around the equipment and then measure the oxygen concentration inside the chamber after the experiment.

[0003] The existing oxygen concentration measurement has the following drawbacks: 1) It cannot monitor the oxygen concentration in the test chamber in real time and control the status of the test chamber door. It lacks control measures for the entire test process and abnormal situations, which poses certain safety risks; 2) The oxygen concentration sensor has a limited operating temperature. When conducting high and low temperature tests, the measured oxygen concentration may not be accurate; 3) During the use of liquid nitrogen, the test chamber lacks an organic and unified safety control system for oxygen detection, air replacement and door interlocking. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid nitrogen safety control system for a climate environment test chamber, so as to solve the technical problem that existing climate test chambers cannot achieve comprehensive safety control of liquid nitrogen.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A liquid nitrogen safety control system for a climate environment test chamber includes: a climate environment test chamber, an internal oxygen concentration measurement system, an external oxygen concentration measurement system, a door interlock control system, an internal pressure control system, and an air replacement system. The internal oxygen concentration measurement system is installed on the side wall of the test chamber and is used to measure the oxygen concentration inside the test chamber. The external oxygen concentration measurement system is installed on one side of the test chamber door and is used to measure the oxygen concentration in the area where the test chamber door is located. The door interlock control system is installed on the test chamber door and is used to control the opening and closing state of the door based on the oxygen concentration. The internal pressure control system is installed on the side wall of the test chamber and is used to regulate and control the internal pressure of the test chamber to maintain a stable equilibrium state. The air replacement system is installed on the side wall of the test chamber and is used to remove nitrogen gas from inside the test chamber.

[0006] Preferably, the above-mentioned oxygen concentration measurement system in the chamber is based on the pump suction method to extract the air from the test chamber, adjust the temperature of the air in the chamber through the replacement pipeline, and filter out the moisture through the mirror water separation device, and then use the oxygen concentration sensor to measure the oxygen content in the chamber.

[0007] Preferably, the above-mentioned external oxygen concentration measurement system is installed on one side of the test chamber door, and measures the oxygen content of the area through an oxygen concentration sensor.

[0008] Preferably, the door interlocking control system controls the test chamber door to remain closed when the oxygen concentration inside the chamber, as measured by the oxygen concentration measurement system inside the chamber, is lower than the safety threshold.

[0009] Preferably, when the above-mentioned door interlocking control system detects that the test chamber door is closed and remains closed, it detects whether the liquid nitrogen-assisted cooling program has been started.

[0010] Preferably, the above-mentioned internal pressure control system connects the sampling port to the detection box based on the detection tube, and determines whether the air pressure in the ocean phase is balanced based on the detection box.

[0011] Preferably, the pressure control system inside the chamber detects changes in the internal pressure of the test chamber through a micro-pressure sensor when the liquid nitrogen cooling program is started.

[0012] Preferably, the air replacement system includes an intake valve and an exhaust valve, wherein the intake valve introduces outside air into the test chamber and the exhaust valve replaces the air inside the test chamber with outside air.

[0013] Preferably, when the oxygen concentration inside the chamber reaches the preset concentration requirement, the above-mentioned control and replacement system controls the intake and exhaust valves to stop working.

[0014] Preferably, the above-mentioned climate environment test chamber is composed of one or more small climate environment test chambers, and each small climate test chamber completes the environmental test independently.

[0015] In this invention, an internal oxygen concentration measurement system is used to measure the oxygen concentration inside the test chamber; an external oxygen concentration measurement system is used to measure the oxygen concentration in the area where the test chamber door is located; a door interlock control system is used to control the opening and closing of the door based on the oxygen concentration; an internal pressure control system is used to regulate and control the pressure inside the test chamber to maintain a stable equilibrium; and an air replacement system is used to remove nitrogen from inside the test chamber. This establishes an internal oxygen concentration measurement system for the entire test process and connects it to the door interlock control system to avoid the risk of asphyxiation for test personnel. This solves the technical problem that existing climate test chambers cannot achieve comprehensive safety control of liquid nitrogen, thus achieving the technical effect of ensuring safety throughout the entire test process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a liquid nitrogen safety control system for a climate environment test chamber according to an embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not to a precise scale, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0018] It should be noted that, in order to clearly illustrate the content of this invention, several embodiments are provided to further explain different implementations of the invention. These embodiments are enumerated rather than exhaustive. Furthermore, for the sake of brevity, content mentioned in the preceding embodiments is often omitted in the following embodiments. Therefore, content not mentioned in the later embodiments can be referred to in the preceding embodiments.

[0019] Example 1 A liquid nitrogen safety control system for a climate environment test chamber, such as Figure 1 As shown, it includes: a climate environment test chamber, an internal oxygen concentration measurement system, an external oxygen concentration measurement system, a door interlock control system, an internal pressure control system, and an air replacement system; An internal oxygen concentration measurement system is installed on the side wall of the test chamber to measure the oxygen concentration inside the test chamber. An external oxygen concentration measurement system is installed on one side of the test chamber door to measure the oxygen concentration in the area where the test chamber door is located. The door interlocking control system is installed on the door of the test chamber and is used to control the opening and closing status of the door based on the oxygen concentration. The pressure control system inside the chamber is installed on the side wall of the test chamber and is used to regulate and control the pressure inside the test chamber to maintain a stable and balanced state. An air displacement system, installed on the side wall of the test chamber, is used to remove nitrogen gas from inside the test chamber.

[0020] As an optional implementation, the oxygen concentration measurement system in the chamber is based on the pump suction method to extract air from the test chamber, adjust the temperature of the air in the chamber through the replacement pipeline, filter out the moisture through the mirror water separation device, and then use the oxygen concentration sensor to measure the oxygen content in the chamber.

[0021] As an optional implementation, an external oxygen concentration measurement system is installed on one side of the test chamber door, and the oxygen concentration sensor measures the oxygen content in the area.

[0022] As an optional implementation, the door interlock control system controls the test chamber door to remain closed when the oxygen concentration inside the chamber, as measured by the oxygen concentration measurement system, is lower than the safety threshold.

[0023] As an optional implementation, the door interlocking control system detects whether the liquid nitrogen-assisted cooling program has been activated when it detects that the test chamber door is closed and remains closed.

[0024] As an alternative implementation, the chamber pressure control system connects the sampling port to the detection box based on the detection tube, and determines whether the air pressure in the ocean phase is balanced based on the detection box.

[0025] As an optional implementation, the chamber pressure control system detects changes in the internal pressure of the test chamber through a micro-pressure sensor when the liquid nitrogen cooling program is activated.

[0026] As an optional implementation, the air replacement system includes an intake valve and an exhaust valve. The intake valve introduces outside air into the test chamber, and the exhaust valve replaces the air inside the test chamber with outside air.

[0027] As an optional implementation, the control system stops the intake and exhaust valves when the oxygen concentration inside the chamber reaches the preset concentration requirement.

[0028] As an optional implementation, the climate environment test chamber is composed of one or more small climate environment test chambers, each of which performs environmental tests independently.

[0029] Specifically, the liquid nitrogen safety control system of the aforementioned climate environment test chamber is not limited to, for example, Figure 1 As shown (the control systems and water and electricity auxiliary systems of each device are not shown), the test chamber control system is not limited to being the control center of the safety control system. The safety control system specifically includes: climate environment test chamber, internal oxygen concentration measurement system, external oxygen concentration measurement system, door interlock control system, internal pressure control system, and air replacement system.

[0030] The internal oxygen concentration detection system measures the oxygen concentration inside the test chamber throughout the entire process. The external fixed oxygen concentration sensor measures the oxygen concentration in the area where the test chamber door is located. The door interlock control system ensures that the door is closed when the oxygen concentration is low. The internal pressure control system regulates the pressure inside the test chamber to maintain a stable balance. The air replacement system removes nitrogen from inside the test chamber.

[0031] Climate environment test chambers are used for comprehensive environmental testing. They may include multiple individual microclimate environment test chambers, each of which can perform environmental tests independently or be combined according to actual needs to complete environmental tests.

[0032] The oxygen concentration detection system inside the chamber uses a pump to extract air from the chamber, and then the air temperature is adjusted to the operating range of the oxygen concentration sensor through a heat exchange pipeline. After that, the air is filtered out of moisture by a water separator, and the oxygen concentration sensor is used to measure the oxygen content inside the chamber.

[0033] The door interlock control system connects the electromagnetic lock installed on the test chamber door to the test chamber control system. It controls the closing of the electromagnetic lock by judging the oxygen concentration inside the chamber, and controls whether the liquid nitrogen-assisted cooling program is started by detecting the closing status of the electromagnetic lock.

[0034] The pressure control system inside the chamber has a sampling port at the top of each test chamber, and a concentration detection box is located at the back of the test chamber. The sampling port is connected to the detection box via a detection tube to determine whether the air pressure inside the test chamber is balanced. When liquid nitrogen is used for assisted cooling, the test chamber uses a micro-differential pressure sensor to detect pressure changes inside the chamber. The sensor's function is to maintain a slightly positive pressure environment in the test chamber during ventilation and to monitor the operation of the nitrogen venting system during liquid nitrogen cooling.

[0035] The air replacement system achieves air replacement within the test chamber by controlling the air intake valve at the top and the exhaust valve at the back. Before or after the test, the ventilation fan starts working, replacing the air inside the test chamber with outdoor air and introducing outside air into the chamber for replacement. When the oxygen concentration reaches the set safe value, both the air intake and exhaust valves close simultaneously, and the ventilation fan stops working, thus achieving rapid air replacement inside the test chamber.

[0036] The entire environmental testing system is linked by multiple safety control systems to provide safety assurance throughout the entire testing process.

[0037] In this embodiment of the application, based on the safety hazard of suffocation when using liquid nitrogen-assisted cooling technology in climate environment tests, an oxygen concentration measurement system inside the chamber was established throughout the test process and connected to the door interlock control system to avoid the risk of suffocation for test personnel. The air replacement system can quickly replace the gas inside the test chamber after the test. The system architecture is complete and ingeniously designed, effectively improving the safety of the entire test process.

Claims

1. A liquid nitrogen safety control system for a climate environment test chamber, characterized in that, include: Climate environment test chamber, internal oxygen concentration measurement system, external oxygen concentration measurement system, door interlock control system, internal pressure control system, and air replacement system; The oxygen concentration measurement system inside the chamber is installed on the side wall of the test chamber and is used to measure the oxygen concentration inside the test chamber. The external oxygen concentration measurement system is installed on one side of the test chamber door and is used to measure the oxygen concentration in the area where the test chamber door is located. The door interlocking control system is installed on the door of the test chamber and is used to control the opening and closing status of the door based on the oxygen concentration. The pressure control system inside the chamber is installed on the side wall of the test chamber and is used to regulate and control the pressure inside the test chamber to maintain a stable and balanced state. The air replacement system is installed on the side wall of the test chamber and is used to remove nitrogen gas from inside the test chamber.

2. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The oxygen concentration measurement system inside the chamber is based on the pump suction method to extract air from the test chamber. After the temperature of the air inside the chamber is adjusted by the replacement pipeline and the water is filtered out by the mirror water separation device, the oxygen concentration sensor is used to measure the oxygen content inside the chamber.

3. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The external oxygen concentration measurement system is installed on one side of the test chamber door and measures the oxygen content in the area using an oxygen concentration sensor.

4. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The door interlocking control system controls the test chamber door to remain closed when the oxygen concentration inside the chamber, as measured by the oxygen concentration measurement system inside the chamber, is lower than the safety threshold.

5. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 4, characterized in that, When the door interlocking control system detects that the test chamber door is closed, it checks whether the liquid nitrogen-assisted cooling program has been activated.

6. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The pressure control system inside the chamber connects the sampling port to the detection box based on the detection tube, and determines whether the air pressure in the ocean phase is balanced based on the detection box.

7. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 5, characterized in that, When the liquid nitrogen cooling program is activated, the pressure control system inside the chamber detects changes in the internal pressure of the test chamber through a micro-pressure sensor.

8. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The air replacement system includes an intake valve and an exhaust valve. The intake valve introduces outside air into the test chamber, and the exhaust valve replaces the air inside the test chamber with outside air.

9. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 8, characterized in that, When the oxygen concentration inside the chamber reaches the preset concentration requirement, the control and replacement system stops the operation of the intake and exhaust valves.

10. The liquid nitrogen safety control system for the climate environment test chamber as described in claim 1, characterized in that, The climate environment test chamber is composed of one or more small climate environment test chambers, and each small climate test chamber completes environmental tests independently.

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