Intermittent operation constant temperature control liquid nitrogen evaporation system

Abstract

The utility model discloses a liquid nitrogen evaporation system with intermittent operation and constant temperature control. Comprising a low-temperature liquid nitrogen storage tank, an air temperature type vaporizer, a low-temperature stop valve, a safety valve, a pressure gauge, a switch type pneumatic valve, a temperature sensor, a switch type electromagnetic valve, a blow-down pipe, a pressure sensor, a stop valve, a ball valve, a liquid nitrogen pipeline, a nitrogen pipeline and the like. A switch type pneumatic valve bypass is installed on a pipeline of the air temperature type vaporizer, a switch type electromagnetic valve is installed at an outlet of the pipeline of the air temperature type vaporizer, and the electromagnetic valve and the pneumatic valve are controlled through a temperature sensor arranged on a gas pipeline, so that the system can operate intermittently according to process requirements, and meanwhile it is guaranteed that the temperature of a gas source meets a set value. According to the utility model, under the condition of realizing the experimental environment requirement of stably conveying gas, on the basis of meeting the experimental constant-temperature control requirement, the aims of intermittently operating the system, saving liquid nitrogen consumption and prolonging the service life of equipment are fulfilled.

Description

Technical Field

[0001] The utility model relates to the design field of a gas constant temperature delivery system in a special laboratory. Specifically, it is a liquid nitrogen evaporation system with intermittent operation and constant temperature control. It provides nitrogen gas with constant temperature required by experiments within a specific time period. At the same time, the system operates intermittently according to experimental and production needs, thereby achieving the purpose of saving liquid nitrogen consumption, extending equipment life, and maintaining a constant gas temperature. Background Art

[0002] Nitrogen (N2) is the most abundant gas in Earth's atmosphere, accounting for approximately 78% of its volume. It is a colorless, odorless, non-toxic, and inert gas with low reactivity. Nitrogen's primary source is the nitrogen cycle, where Earth's plants and microorganisms convert atmospheric nitrogen into usable compounds for biological use. Due to its widespread presence and stability, nitrogen plays a vital role in nature and industry. Nitrogen (N2) is widely used in industrial and scientific fields, including industrial production, food and beverages, biomedicine, refrigeration and freezing, and the electronics and semiconductor industries.

[0003] When conducting some special scientific experiments, there will be some special requirements. In order to meet these special requirements, the system needs to be optimized and adjusted to achieve the purpose.

[0004] The utility model is a constant temperature gas delivery system for intermittent operation in special laboratories. Some experimental devices have very high requirements for gas temperature, requiring a temperature control range of 20±0.5℃. If this requirement is not met, the surfaces of the experimental device components will be damaged due to temperature changes. The experimental time is intermittent, and the experimental device needs to be corrected and adjusted during this period. Currently, there is basically no requirement for constant temperature of gas. If there is, it is only heated when the gas temperature is too low. In addition, during the intermittent period of the experiment, the gas system must be in a closed state to avoid unnecessary consumption of liquid nitrogen and shorten the service life of the equipment. Utility Model Content

[0005] Therefore, in order to address the above-mentioned shortcomings, the present invention provides an intermittently operated constant temperature controlled liquid nitrogen evaporation system; under the condition of achieving stable gas delivery requirements, the system operates intermittently, reduces liquid nitrogen consumption, extends the service life of the equipment and maintains a constant gas source temperature.

[0006] The utility model is realized by constructing an intermittently operated constant temperature controlled liquid nitrogen evaporation system, characterized in that the system comprises a low temperature liquid nitrogen storage tank (1), an air temperature type vaporizer (2), a low temperature stop valve (3), a safety valve (4), a pressure gauge (5), a switch type pneumatic valve (6), a temperature sensor (7), a switch type solenoid valve (8), a vent pipe (9), a pressure sensor (10), a stop valve (11), a ball valve (12), a liquid nitrogen pipeline (13), and a nitrogen pipeline (14); a switch type pneumatic valve (6) is installed in a bypass pipeline of the air temperature type vaporizer (2), a switch type solenoid valve (8) is installed in an outlet of the air temperature type vaporizer (2), and a temperature sensor (7), a vent pipe (9), a pressure sensor (10), a stop valve (11), and a ball valve (12) are respectively installed at the gas outlet end; the switch type pneumatic valve (6) and the switch type solenoid valve (8) are operated by the temperature sensor (7) on the corresponding pipeline to control the temperature of the obtained nitrogen and the intermittent operation of the vaporizer.

[0007] According to the utility model, an intermittently operated constant temperature controlled liquid nitrogen evaporation system is characterized in that a low-temperature liquid nitrogen storage tank (1) is connected to a liquid nitrogen tank truck via a liquid nitrogen pipeline (13).

[0008] According to the utility model, an intermittently operated constant temperature controlled liquid nitrogen evaporation system is characterized in that a low temperature stop valve (3) and a safety valve (4) are installed on the output pipeline of the low temperature liquid nitrogen storage tank (1).

[0009] A switch-type pneumatic valve bypass is installed in the air-temperature vaporizer pipeline, and a switch-type solenoid valve is installed at the outlet of the air-temperature vaporizer pipeline. The solenoid valve and pneumatic valve are controlled by a temperature sensor installed in the gas pipeline, allowing the system to operate intermittently according to process requirements while ensuring that the gas source temperature meets the set value. This utility model achieves the experimental environment requirements of stable gas delivery and meets the experimental constant temperature control requirements. The system operates intermittently, saving liquid nitrogen consumption and extending the life of the equipment.

[0010] The utility model has the following advantages: the utility model provides an intermittently operated constant temperature controlled gas delivery system; under the condition of achieving the constant temperature gas delivery requirement, the purpose of increasing the probability of successful experimental operation; the advantages of the utility model are reflected in;

[0011] 1. Precise temperature control: constant temperature control technology is used to accurately adjust the temperature. This system sets a temperature sensor on the carburetor outlet pipe. At the same time, to ensure the accuracy of the temperature sensor measurement value, three groups of temperature sensors are set on the gas supply main line. The measurement values ​​of two groups are selected to control the action of the solenoid valve to ensure that the system operates stably within the set range. It is very suitable for temperature-sensitive applications.

[0012] Second, energy-saving operation: The intermittent operation mode is controlled according to the terminal process requirements and is started only when needed, which reduces the overall energy consumption and liquid nitrogen consumption. In the case of large load fluctuations, it can effectively reduce energy waste.

[0013] 3. Reduce operating costs: By optimizing operating time and energy consumption, long-term operating costs are reduced and economic efficiency is improved.

[0014] 4. Flexibility: The operating cycle and temperature settings can be flexibly adjusted according to needs to adapt to different application scenarios.

[0015] 5. Safety: Liquid nitrogen is relatively safe under normal operation. The system is equipped with safety valves and relief pipes on the corresponding pipelines to ensure that the system pressure does not exceed the set value and ensure the safe operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system block diagram of the present utility model.

[0017] Among them: 1 low-temperature liquid nitrogen storage tank, 2 air-temperature vaporizer, 3 low-temperature stop valve, 4 safety valve, 5 pressure gauge, 6 on-off pneumatic valve, 7 temperature sensor, 8 on-off solenoid valve, 9 vent pipe, 10 pressure sensor, 11 stop valve, 12 ball valve, 13 liquid nitrogen pipeline, 14 nitrogen pipeline. DETAILED DESCRIPTION

[0018] The following will be combined with the Figure 1 This utility model is described in detail, and the technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the embodiments described are only some of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this utility model.

[0019] The present invention provides a liquid nitrogen evaporation system with intermittent operation and constant temperature control. Figure 1 As shown, the system includes a cryogenic liquid nitrogen storage tank 1, an air-temperature vaporizer 2, a cryogenic stop valve 3, a safety valve 4, a pressure gauge 5, an on-off pneumatic valve 6, a temperature sensor 7, an on-off solenoid valve 8, a vent pipe 9, a pressure sensor 10, a stop valve 11, a ball valve 12, a liquid nitrogen pipeline 13, and a nitrogen pipeline 14; the on-off pneumatic valve 6 is installed in the bypass pipeline of the air-temperature vaporizer 2, the on-off solenoid valve 8 is installed in the outlet of the air-temperature vaporizer 2, and the temperature sensor 7, the vent pipe 9, the pressure sensor 10, the stop valve 11, and the ball valve 12 are respectively installed in the gas outlet end; the temperature sensor 7 on the corresponding pipeline controls the operation of the on-off pneumatic valve 6 and the on-off solenoid valve 8, thereby controlling the temperature of the generated nitrogen and the intermittent operation of the vaporizer.

[0020] In the implementation of the intermittently operated constant temperature controlled liquid nitrogen evaporation system of the present invention, the low-temperature liquid nitrogen storage tank 1 is connected to the liquid nitrogen tank truck via the liquid nitrogen pipeline 13 .

[0021] In the implementation of the intermittently operated constant temperature controlled liquid nitrogen evaporation system of the present invention, a low temperature stop valve 3 and a safety valve 4 are installed on the output pipeline of the low temperature liquid nitrogen storage tank 1 .

[0022] The cryogenic liquid nitrogen storage tank is equipped with a pressure gauge, level indicator, and pressure control device to monitor the conditions within the tank. Liquid nitrogen from the cryogenic liquid nitrogen storage tank flows through a pipeline into an air-temperature vaporizer, where it is heated, vaporized, and converted into gaseous nitrogen. The temperature of the gas at the air-temperature vaporizer outlet is set to 20°C (adjustable). A temperature sensor, pressure gauge, and safety valve are installed at the vaporizer outlet. These temperature sensors are interlocked with a pneumatic on / off valve in the vaporizer bypass line to maintain the set temperature of the nitrogen at the outlet. When the vaporizer is not operating, the pneumatic valve in the bypass line is open. When the outlet nitrogen temperature exceeds the set value, the on / off valve closes, allowing the vaporizer to operate, heating the nitrogen and maintaining the set temperature. A bleed pipe and safety valve are also provided to ensure that the system pressure does not exceed the design pressure. The nitrogen outlet line is equipped with a pressure sensor and a temperature sensor, which are interlocked with the on / off solenoid valve in the vaporizer outlet line to control intermittent operation of the vaporization system.

[0023] The beneficial technical effects of this patent after the above improvements are:

[0024] 1. Precise temperature control: constant temperature control technology is used to accurately adjust the temperature. This system sets a temperature sensor on the carburetor outlet pipe. At the same time, to ensure the accuracy of the temperature sensor measurement value, three groups of temperature sensors are set on the gas supply main line. The measurement values ​​of two groups are selected to control the action of the solenoid valve to ensure that the system operates stably within the set range. It is very suitable for temperature-sensitive applications.

[0025] Second, energy-saving operation: The intermittent operation mode is controlled according to the terminal process requirements and is started only when needed, which reduces the overall energy consumption and liquid nitrogen consumption. In the case of large load fluctuations, it can effectively reduce energy waste.

[0026] 3. Reduce operating costs: By optimizing operating time and energy consumption, long-term operating costs are reduced and economic efficiency is improved.

[0027] 4. Flexibility: The operating cycle and temperature settings can be flexibly adjusted according to needs to adapt to different application scenarios.

[0028] 5. Safety: Liquid nitrogen is relatively safe under normal operation. The system is equipped with safety valves and relief pipes on the corresponding pipelines to ensure that the system pressure does not exceed the set value and ensure the safe operation of the system.

[0029] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intermittently operated constant temperature controlled liquid nitrogen evaporation system, characterized in that: The system comprises a cryogenic liquid nitrogen storage tank (1), an air-temperature vaporizer (2), a cryogenic stop valve (3), a safety valve (4), a pressure gauge (5), an on-off pneumatic valve (6), a temperature sensor (7), an on-off solenoid valve (8), a vent pipe (9), a pressure sensor (10), a stop valve (11), a ball valve (12), a liquid nitrogen pipeline (13), and a nitrogen pipeline (14); the on-off pneumatic valve (6) is installed on the bypass pipeline of the air-temperature vaporizer (2), the on-off solenoid valve (8) is installed on the outlet of the air-temperature vaporizer (2), and the temperature sensor (7), the vent pipe (9), the pressure sensor (10), the stop valve (11), and the ball valve (12) are respectively installed on the gas outlet end; the on-off pneumatic valve (6) and the on-off solenoid valve (8) are operated by the temperature sensor (7) on the corresponding pipeline to control the temperature of the generated nitrogen and the intermittent operation of the vaporizer.

2. The intermittently operated constant temperature controlled liquid nitrogen evaporation system according to claim 1, characterized in that: The low-temperature liquid nitrogen storage tank (1) is connected to the liquid nitrogen tank truck via a liquid nitrogen pipeline (13).

3. The intermittently operated constant temperature controlled liquid nitrogen evaporation system according to claim 1, characterized in that: A cryogenic shut-off valve (3) and a safety valve (4) are installed on the output pipeline of the cryogenic liquid nitrogen storage tank (1).

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