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A temperature-stabilized and pressure-stabilized low-temperature cold air generating device and control method

A technology for generating device and cold air, which is applied in the field of low temperature, can solve problems such as difficult to generate adjustable and stable cold air, complex system, etc., and achieve the effect of improving heat exchange stability and precision

Active Publication Date: 2021-11-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low-temperature cold air generating device and control method with stable temperature and pressure, so as to solve the problem that the existing system for generating cold air when liquid nitrogen is used as a cold air source is relatively complicated and difficult to produce cold air. well-tuned air conditioner

Method used

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  • A temperature-stabilized and pressure-stabilized low-temperature cold air generating device and control method
  • A temperature-stabilized and pressure-stabilized low-temperature cold air generating device and control method
  • A temperature-stabilized and pressure-stabilized low-temperature cold air generating device and control method

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Embodiment 1

[0042] This embodiment discloses a low-temperature cold air generating device with stable temperature and pressure, such as figure 1 As shown, the device includes a liquid nitrogen tank 1 for placing liquid nitrogen, a mixing container 2, a heat exchanger 3, a liquid nitrogen delivery pipeline 4, a nitrogen delivery pipeline 5, a controller 7, a first heating device 8, a second heating Device 9 , first temperature sensor 10 , second temperature sensor 11 , pressure sensor 12 , first control valve 13 and second control valve 14 .

[0043] Liquid nitrogen is placed in the liquid nitrogen tank 1, and the liquid nitrogen can be initially vaporized in the liquid nitrogen tank 1 to generate nitrogen gas. The liquid nitrogen tank 1 is provided with a first gas outlet 101 and a second gas outlet 102, wherein the first gas outlet 101 outputs liquid nitrogen, and the second gas outlet outputs nitrogen gas. The generated nitrogen can provide sufficient pressure to input liquid nitrogen ...

Embodiment 2

[0059] This embodiment discloses a method for controlling low-temperature cold air with stable temperature and pressure. In this method, the low-temperature cold air generating device described in the embodiment is used to generate cold air. During the process of generating cold air, the pressure and temperature of the cold air are controlled by the following methods:

[0060] The pressure and temperature of the gas in the mixing container 2 are monitored. Specifically, in this embodiment, the temperature and pressure of the gas in the mixing container 2 are monitored by the second temperature sensor 11 and the pressure sensor 12 .

[0061] If the pressure of the gas in the detected mixing container 2 is lower than the preset pressure, adjust the second control valve 14 to increase the gas supply of liquid nitrogen; if the pressure in the mixing container 2 is higher than the preset pressure, Adjust the second control valve 14 to reduce the gas supply of liquid nitrogen; if the...

Embodiment 3

[0067] This embodiment discloses a method for generating low-temperature cold air with stable temperature and pressure, including the following steps:

[0068] (1) Open the controller 7, and set the pressure, temperature and flow of the cold air on the controller 7; the controller 7 of the present embodiment stores the control program described in Embodiment 2.

[0069] (2) Open the liquid nitrogen valve and the nitrogen valve of the liquid nitrogen tank 1;

[0070] (3) Observe the pressure and temperature in the mixing container 2. It should be noted here that if the pressure and temperature are too far from the required pressure and temperature, properly adjust the pressure at the first gas outlet 101 of the liquid nitrogen tank 1. The nitrogen valve at the liquid nitrogen valve and the second gas outlet 102 places;

[0071] (4) Continue to observe the pressure and temperature in the mixing container, and let the system run stably for a period of time after the pressure and...

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Abstract

The invention discloses a temperature-stabilized and pressure-stabilized low-temperature cold air generating device and a control method. The generating device includes a liquid nitrogen tank for placing liquid nitrogen, a mixing container, a heat exchanger, a liquid nitrogen delivery pipeline, a nitrogen gas delivery pipeline, a control device, a first heating device, a second heating device, a first temperature sensor, a second temperature sensor, a pressure sensor, a first control valve and a second control valve. The invention can improve the heat exchange stability of the system by arranging the heat exchanger on the liquid nitrogen delivery pipeline, and can quickly adjust the required cold air pressure and temperature to meet the required requirements. The cold air generated by the device of the present invention is basically similar to low-temperature air, does not contain water vapor, and does not require much compression work; the control method of the present invention can improve the accuracy of the temperature control of the output cold air, so that the error is within 1.5°C.

Description

technical field [0001] The invention belongs to the field of low-temperature technology, and in particular relates to a temperature-stabilized and voltage-stabilized low-temperature cold air generating device and a control method. Background technique [0002] Refrigeration systems are widely used in scientific research and industrial production. According to different refrigeration cycles, different refrigeration cycles can be designed. The main refrigeration cycles are: compression refrigeration cycle, absorption refrigeration cycle, steam injection refrigeration cycle and semiconductor refrigeration. The compression refrigeration cycle is divided into a compressed air refrigeration cycle and a compressed vapor refrigeration cycle, and the latter is widely used in the industrial manufacturing of refrigeration systems. The compression refrigeration cycle needs to consume compression work, and the structure is complex. To use the compression refrigeration cycle to generate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D7/08F28F27/00F25D3/10
CPCF25D3/10F28D7/082F28F27/00
Inventor 刘振刚刘振侠张斐刘亚楠吴丁毅吕亚国胡剑平张丽芬朱鹏飞高文君刁伟楠
Owner NORTHWESTERN POLYTECHNICAL UNIV
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