CN111947366A

CN111947366A - Liquid nitrogen refrigerating system

Info

Publication number: CN111947366A
Application number: CN202010968696.2A
Authority: CN
Inventors: 赵洪林
Original assignee: Wuxi Aisico Instrument Co ltd
Current assignee: Wuxi Aisico Instrument Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2020-11-17

Abstract

The invention provides a liquid nitrogen freezing system which comprises a liquid nitrogen tank and a controller, wherein a pipeline is communicated and arranged at the bottom of one side of the liquid nitrogen tank, a freezing box body is communicated and arranged at the other end of the pipeline, a first valve, a safety valve, a filter, a second valve, a safety valve and a control valve are sequentially and fixedly arranged on the pipeline from left to right, an atomizing device is fixedly arranged at the other end of the pipeline, the atomizing device is positioned in the freezing box body, the control valve is electrically connected with the controller, a temperature sensor is electrically connected onto the controller, and the temperature sensor is electrically connected with the freezing box body.

Description

Liquid nitrogen refrigerating system

Technical Field

The invention belongs to the technical field of liquid nitrogen application, and particularly relates to a liquid nitrogen freezing system.

Background

At present, liquid nitrogen is the most environment-friendly and efficient cooling and freezing mode at present, and can be applied to the technical fields of food freezing processing and cryogenic treatment of metal heat treatment processes.

Disclosure of Invention

The invention provides a liquid nitrogen refrigeration system which can achieve the purposes of degradability and refrigeration.

The technical scheme of the invention is realized as follows: the utility model provides a liquid nitrogen refrigerating system, includes liquid nitrogen container and controller, the bottom intercommunication of liquid nitrogen container one side is provided with the pipeline, the other end intercommunication of pipeline is provided with freezing box, from left to right fixed first valve, relief valve, filter, second valve, relief valve and the control valve of having set gradually on the pipeline, the fixed atomizing device that is provided with of the other end of pipeline, atomizing device is located freezing box, control valve and controller electric connection, electric connection has temperature sensor on the controller, temperature sensor and freezing box electric connection.

The controller monitors the temperature signal in the box body through the temperature sensor according to the temperature set value to determine the opening/closing of the valve, so as to realize the temperature control in the box body, and the valve control method 1 comprises the following steps: switching a valve, controlling the switching frequency of the valve to control temperature, and controlling the valve by a valve control method 2: the opening valve controls the opening of the valve to control the temperature, the liquid phase in the liquid nitrogen tank passes through the valve, the controller controls the opening and closing/opening of the valve to control the flow, and the liquid nitrogen is gasified in the tank through the atomizing device to realize the temperature control.

In a preferred embodiment, a fan is fixedly arranged in the freezing box body, a temperature equalizing fan is arranged in the box body, the temperature uniformity in the box body is improved, and the fan has a frequency conversion function.

As a preferred embodiment, a heater is arranged in the freezing box body, the heater is electrically connected with the controller, the heater is positioned between the fan and the atomizing device, and the heater is arranged in the box body, so that the function of controlling high and low temperatures in the box body can be realized.

As a preferred embodiment, a heat exchanger is fixedly arranged in the freezing box body, one end of the heat exchanger is communicated with the pipeline, the other end of the heat exchanger penetrates out of the lower portion of the right side wall of the freezing box body, an exhaust valve is fixedly arranged at the other end of the heat exchanger and electrically connected with a controller, and the fan is located on the rear side of the heat exchanger. The incasement is equipped with the heater, can realize that the incasement has high low temperature control function, and exhaust nitrogen gas can be retrieved.

In a preferred embodiment, the temperature sensor is located inside the freezer compartment, and the controller is electrically connected with the liquid level sensor, which is located inside the freezer compartment. The bottom of the freezing box body is communicated with a liquid discharge pipe, a liquid discharge valve is fixedly arranged on the liquid discharge pipe, and the liquid discharge valve is electrically connected with the controller. The liquid level sensor includes two that the interval set up from top to bottom, and the liquid level sensor of wherein the top is located the upper portion in the freezer box, and the liquid level sensor of below is located the lower part in the freezer box. The liquid level is controllable (liquid supply is stopped when the set liquid level value is reached), the liquid can be supplied automatically (liquid supply is stopped when the liquid level is reduced), the liquid level height can be displayed in real time, the temperature in the box can be displayed, and the liquid can be discharged through a liquid discharge valve (the liquid discharge valve can be operated manually or automatically)

After the technical scheme is adopted, the invention has the beneficial effects that:

the freezing system adopts a liquid nitrogen gasification refrigeration mode, the temperature equalizing fan is arranged in the freezing box body, the temperature in the box body can be uniformly controlled, the temperature uniformity can be improved by the internal fan, and the temperature of the freezing cavity is controllable.

Secondly, the freezing system adopts a liquid nitrogen immersion mode, can realize liquid level height control, can automatically supplement liquid, and can monitor the internal liquid level and the internal temperature.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an additional fan according to the present invention;

FIG. 3 is a schematic view of an additional heater according to the present invention;

FIG. 4 is a schematic view of the construction of an additional heat exchanger according to the present invention;

FIG. 5 is a schematic view of the present invention with the addition of a level sensor;

FIG. 6 is a schematic view of the connection of liquid nitrogen and piping;

FIG. 7 is a block flow diagram of the present invention;

fig. 8 is a schematic diagram of the structure of the present invention.

In FIGS. 1 to 7, 1 is a liquid nitrogen tank; 2-a controller; 3-a pipeline; 4-a freezer box; 5-a first valve; 6-safety valve; 7-a filter; 8-a second valve; 9-safety valve; 10-a control valve; 11-an atomizing device; 12-a temperature sensor; 13-a fan; 14-a heater; 15-a heat exchanger; 16-a liquid level sensor; 17-a drain pipe; 18-drain valve.

In FIG. 8, 1. Dewar flask; 2. a liquid nitrogen filling port; 3. a manual valve; 4. a liquid level meter; 5. a secondary low temperature pressure gauge; 6. a gas cylinder safety valve; 7. a rupture disk; 8. a low temperature solenoid valve; 9. an exhaust port; 10. a low temperature check valve; 11. a low temperature pressure reducing valve; 12. a low temperature flow meter; 13. a liquid nitrogen safety valve; 14. an electric low-temperature regulating valve; 15. the flow direction of liquid nitrogen; 16. a vacuum hose; 17. an injection device; 18. a heat-insulating layer; 19. a gasifier.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 8, a liquid nitrogen freezing system includes a liquid nitrogen tank 2 and a controller 2, a pipeline 3 is provided in communication with the bottom of one side of the liquid nitrogen tank 2, a freezing box 4 is provided in communication with the other end of the pipeline 3, a first valve 5, a safety valve 96, a filter 7, a second valve 8, the safety valve 96 and a control valve 10 are sequentially and fixedly provided on the pipeline 3 from left to right, an atomizing device 11 is fixedly provided at the other end of the pipeline 3, the atomizing device 11 is located in the freezing box 4, the control valve 10 is electrically connected with the controller 2, a temperature sensor 12 is electrically connected to the controller 2, and the temperature sensor 12 is electrically connected with the freezing box 4.

The controller 2 monitors the temperature signal in the box body through the temperature sensor 12 according to the temperature set value to determine the opening/closing of the valve, and the temperature control in the box body is realized. Valve control method 1: the valve is switched, and the switching frequency of the valve 10 is controlled; valve control method 2: the opening valve controls the opening size of the valve 10 to control the temperature; the liquid phase in the liquid nitrogen tank 2 passes through a valve, the controller 2 controls the opening/closing of the valve 10 to control the flow, and the liquid nitrogen is gasified in the tank through the atomizing device 11 to realize temperature control. (the nozzles may be collectively referred to as atomizing means 11); the first valve 5 and the second valve 8 can be manual valves, and can be intelligent control valves 10, such as electromagnetic valves or pneumatic valves; the control valve 10: the valve 10 is intelligently controlled, such as a solenoid valve or a pneumatic valve.

The freezing box body 4 is internally and fixedly provided with a fan 13, and the controller 2 monitors the temperature in the box body through a temperature sensor 12 to determine the opening/closing degree of the valve and realize the temperature control in the box body. Valve control method 1: the valve is switched, and the switching frequency of the valve 10 is controlled; valve control method 2: the opening valve controls the opening size of the valve 10 to control the temperature; the liquid phase in the liquid nitrogen tank 2 passes through a valve, the controller 2 controls the opening/closing of the valve 10 to control the flow, and the liquid nitrogen is gasified in the tank through the atomizing device 11 to realize temperature control. (the nozzles can be collectively called as an atomizing device 11) is internally provided with a temperature equalizing fan 13 to improve the temperature uniformity in the box, and the fan 13 has a frequency conversion function.

The inside of the freezer body 4 is provided with a heater 14, the heater 14 is electrically connected with the controller 2, the heater 14 is positioned between the fan 13 and the atomization device 11, and the controller 2 monitors the temperature in the freezer body through the temperature sensor 12 to determine the opening/closing degree of the valve, so as to realize the temperature control in the freezer body. Valve control method 1: the valve is switched, and the switching frequency of the valve 10 is controlled; valve control method 2: the liquid phase in the liquid nitrogen tank 2 is controlled by the opening degree of the control valve 10, the liquid phase passes through the valve, the controller 2 controls the opening and closing/opening degree control flow of the valve 10, and the liquid nitrogen is gasified in the tank through the atomizing device 11 to realize temperature control. (the nozzles can be collectively called as an atomizing device 11) is internally provided with a temperature equalizing fan 13 to improve the temperature uniformity in the box, and the fan 13 has a frequency conversion function. The heater 14 is arranged in the box, and the high-low temperature control function in the box can be realized.

The inside fixed heat exchanger 15 that is provided with of freezer chest 4, the lower part setting that freezer chest 4 right side wall was worn out to the one end and the pipeline 3 intercommunication of heat exchanger 15, the other end, the fixed discharge valve that is provided with on the 15 other ends of heat exchanger, discharge valve and controller 2 electric connection, fan 13 is located the rear side of heat exchanger 15, and controller 2 passes through the temperature in the temperature sensor 12 monitoring box, confirms the switch/aperture of discharge valve, realizes incasement temperature control. Valve control method 1: the valve is switched, and the switching frequency of the valve 10 is controlled; valve control method 2: the opening valve controls the opening size of the valve 10 to control the temperature; the liquid phase in the liquid nitrogen tank 2 enters the tank through the control valve 10, is refrigerated through the heat exchanger 15, the cold energy of the heat exchanger 15 is added and released into the tank through the fan 13, and the controller 2 controls the opening/closing of the exhaust valve to achieve the size of the heat exchange amount and achieve temperature control. The inside of the box is provided with a temperature equalizing fan 13 which can add and release the cold energy of the heat exchanger 15 into the box and improve the temperature uniformity in the box. Benefits of the heat exchanger 15: the liquid nitrogen/nitrogen gas does not directly enter the box and does not contact with frozen articles in the box, and the fan 13 has a frequency conversion function. The heater 14 is arranged in the box, and the high-low temperature control function in the box can be realized. The discharged nitrogen gas can be recovered.

The temperature sensor 12 is located inside the freezer body 4, the controller 2 is electrically connected with a liquid level sensor 16, and the liquid level sensor 16 is located inside the freezer body 4. A liquid discharge pipe 17 is communicated with the bottom of the refrigerator body 4, a liquid discharge valve 18 is fixedly arranged on the liquid discharge pipe 17, and the liquid discharge valve 18 is electrically connected with the controller 2. The liquid level sensors 16 include two liquid level sensors arranged at intervals up and down, wherein the upper liquid level sensor 16 is located at the upper part in the freezer compartment 4, and the lower liquid level sensor 16 is located at the lower part in the freezer compartment 4. The controller 2 monitors the temperature in the box body through the temperature sensor 12 to determine the opening/closing of the valve, and liquid inlet control in the box is realized. Valve control method 1: switching frequency valve control method 2 of switching valve, control valve 10: the opening valve controls the opening and closing of the liquid phase in the liquid nitrogen tank 2 by the opening of the valve 10 through the control valve 10, the controller 2 controls the opening and closing/opening control flow of the valve 10, the controller 2 controls the opening and closing/opening of the valve 10 according to the liquid level set value of the liquid level sensor 16, and when the liquid level reaches the set value, the valve is closed; when the liquid level is reduced, the valve is opened, automatic liquid supplement to a set liquid level is realized, and liquid level control is realized. The functions are as follows: the liquid level is controllable (liquid supply is stopped when the set liquid level value is reached), liquid can be automatically supplied (liquid supply is automatically performed when the liquid level is reduced), the liquid level height can be displayed in real time, the temperature in the box can be displayed, and liquid can be discharged through the liquid discharge valve 18 (the liquid discharge valve 18 can be operated manually or automatically).

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a liquid nitrogen refrigerating system, its characterized in that, includes liquid nitrogen container and controller, the bottom intercommunication of liquid nitrogen container one side is provided with the pipeline, the other end intercommunication of pipeline is provided with freezing box, from left to right fixed first valve, relief valve, filter, second valve, relief valve and the control valve of having set gradually on the pipeline, the fixed atomizing device that is provided with of the other end of pipeline, atomizing device is located freezing box, control valve and controller electric connection, electric connection has temperature sensor on the controller, temperature sensor and freezing box electric connection.

2. The liquid nitrogen refrigeration system of claim 1, wherein a fan is fixedly disposed inside the freezer compartment.

3. The liquid nitrogen refrigeration system of claim 2, wherein a heater is disposed inside the freezer compartment, the heater is electrically connected to the controller, and the heater is located between the fan and the atomizing device.

4. The liquid nitrogen refrigeration system according to claim 2, wherein a heat exchanger is fixedly arranged in the refrigerator body, one end of the heat exchanger is communicated with the pipeline, the other end of the heat exchanger penetrates through the lower portion of the right side wall of the refrigerator body, an exhaust valve is fixedly arranged at the other end of the heat exchanger and electrically connected with the controller, and the fan is located on the rear side of the heat exchanger.

5. The liquid nitrogen refrigeration system of claim 1, wherein the temperature sensor is located inside the freezer compartment, and the controller is electrically connected to a liquid level sensor located inside the freezer compartment.

6. The liquid nitrogen refrigeration system as claimed in claim 5, wherein a drain pipe is arranged at the bottom of the refrigerator body in a communicating manner, a drain valve is fixedly arranged on the drain pipe, and the drain valve is electrically connected with the controller.

7. The liquid nitrogen freezing system of claim 6, wherein the liquid level sensors comprise two liquid level sensors spaced up and down, wherein the upper liquid level sensor is located at an upper portion in the freezing box, and the lower liquid level sensor is located at a lower portion in the freezing box.