CN104990323A - Jacket type liquid nitrogen spraying refrigerator - Google Patents

Abstract

The invention discloses a jacketed liquid nitrogen spraying refrigerator, which adopts the jacketed air supply to send the low-temperature nitrogen after liquid nitrogen atomization and spraying into the refrigerator more evenly, so as to realize uniform cooling in the refrigerator. The jacket layer is separated by a partition on the top of the box, and there are multiple air outlet holes on the partition; there is a liquid nitrogen spray device in the jacket layer, which is connected to the liquid storage tank through the liquid inlet pipeline, and the A spray control valve and a booster valve are installed on the liquid pipeline; there is an air supply fan in the jacket layer, an air intake control valve in the jacket layer, and an exhaust control valve at the bottom of the box; the fruit and vegetable storage and transportation area in the box has The oxygen concentration detection device, the temperature detection device and the pressure detection device; the oxygen concentration detection device, the temperature detection device, the pressure detection device, the spray control valve, the intake control valve and the exhaust control valve are respectively connected with the controller. The refrigerated box adopts the jacket type spray air supply method, the temperature field is more uniform, and the setting of the partition prevents the liquid nitrogen from dripping on the fruits and vegetables, causing frostbite.

Description

A Jacketed Liquid Nitrogen Spray Refrigerator

technical field

The invention relates to the technical field of cold storage, in particular to a jacketed liquid nitrogen spray refrigerator.

Background technique

Refrigerators are important portable tools during food transportation. With the continuous development of the circulation field, refrigerators have a wide range of market application scenarios.

At present, most widely used refrigerators are mechanical refrigeration or cold storage. The structure of the mechanical refrigeration device is complicated, and the initial investment is relatively large; the temperature field of the cold storage type is uneven. With the continuous advancement of technology, liquid nitrogen spray technology has been applied in the field of refrigerators. However, the existing liquid nitrogen spray refrigerators use nozzles to directly atomize and spray the liquid nitrogen into the compartment, which will produce many liquid nitrogen droplets, which will cause frostbite to the stored fruits and vegetables, and the temperature field is not uniform enough.

Contents of the invention

The purpose of the present invention is to provide a jacketed liquid nitrogen spray refrigerator for the technical defects existing in the prior art, which adopts jacketed air supply to spray the liquid nitrogen atomized and sprayed low-temperature nitrogen more uniformly. Send it to the refrigerated box to achieve uniform cooling in the box.

The technical scheme adopted for realizing the purpose of the present invention is:

A jacketed liquid nitrogen spray refrigerator, comprising a box, the top of the box is separated from a jacket layer by a partition, and a plurality of air outlets are arranged on the partition; There is a liquid nitrogen spraying device, and the liquid nitrogen spraying device is connected to the liquid storage tank through a liquid inlet pipeline, and a spray control valve and a booster valve are installed on the liquid inlet pipeline; Air supply fan, the jacket layer is provided with an air intake control valve communicating with the outside world, and the bottom of the box is provided with an exhaust control valve; the fruit and vegetable storage and transportation area in the box is provided with an oxygen concentration detection device, a temperature detection device and pressure detection device; the oxygen concentration detection device, temperature detection device, pressure detection device, spray control valve, intake control valve and exhaust control valve are respectively connected with the controller; when the temperature detection device detects When the temperature value is greater than or equal to the set value, the oxygen concentration value is detected. If the oxygen concentration monitored by the oxygen concentration detection device is greater than or equal to the set value, the controller controls the spray control valve to fill the inside of the box with nitrogen. If When the oxygen concentration monitored by the oxygen concentration detection device is lower than the set value, the spray control valve is opened and the intake control valve is opened at the same time; when the temperature value monitored by the temperature detection device is less than or equal to the set value, the spray control valve is closed , stop nitrogen filling; if the pressure detection device monitors that the pressure in the fruit and vegetable storage and transportation area is greater than atmospheric pressure, then open the exhaust control valve to exhaust.

The spraying device includes a liquid nitrogen pipeline installed in the jacket layer and a plurality of atomizing nozzles, and the liquid nitrogen sprayed from the atomizing nozzles is sent to the fruits and vegetables in the box by the action of the air blower. storage area.

The oxygen concentration detection device is an oxygen concentration sensor; the temperature detection device is a temperature sensor; the pressure detection device is a pressure sensor.

The atomizing nozzle is a hollow cone atomizing nozzle.

All the liquid nitrogen pipelines need to be wrapped with thermal insulation materials.

Compared with prior art, the beneficial effect of the present invention is:

1. The refrigerated box of the present invention adopts a jacket type spraying air supply mode, so that the temperature field in the box is more uniform.

2. The refrigerated box of the present invention adopts a spray air supply mode, and the jacket layer is separated by a partition, and the partition is arranged to prevent liquid nitrogen droplets from dripping on fruits and vegetables, causing frostbite.

3. The refrigerated box of the present invention adopts the liquid nitrogen spraying method, and by controlling the oxygen concentration and temperature, the higher concentration of nitrogen suppresses the respiration of fruits and vegetables, and can play a better air conditioning effect.

Description of drawings

FIG. 1 is a schematic structural view of a jacketed liquid nitrogen spray refrigerator of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The jacketed liquid nitrogen spray refrigerator of the present invention includes a box body 1, the top of the box body 1 is separated into a jacket layer by a partition 3, and a plurality of air outlet holes are arranged on the partition 3. A liquid nitrogen spraying device is installed in the jacket layer. The liquid nitrogen spraying device is connected to the liquid storage tank 10 through a liquid inlet pipeline, and a spray control valve 8 and a booster valve 9 are installed on the liquid inlet pipeline. An air supply fan 2 is installed in the jacket layer, an air intake control valve 6 communicating with the outside is arranged in the jacket layer, and an exhaust control valve 13 is arranged at the bottom of the box body 1 . The fruit and vegetable storage and transportation area in the box body 1 is provided with an oxygen concentration detection device 11 , a temperature detection device 12 and a pressure detection device. The oxygen concentration detection device 11 , temperature detection device 12 , pressure detection device, spray control valve 8 , intake control valve 6 and exhaust control valve 13 are respectively connected to the controller 7 . When the temperature value detected by the temperature detection device 12 is greater than or equal to the set value, the oxygen concentration value is detected, and if the oxygen concentration monitored by the oxygen concentration detection device 11 is greater than or equal to the set value, the controller 7 controls the spraying The control valve 8 fills the inside of the box with nitrogen. If the oxygen concentration monitored by the oxygen concentration detection device 11 is lower than the set value, the spray control valve 8 is opened and the intake control valve 6 is opened simultaneously. When the temperature value monitored by the temperature detection device 12 is less than or equal to the set value, the spray control valve 8 is closed and the nitrogen filling is stopped. If the pressure detection device monitors that the pressure in the fruit and vegetable storage area is greater than the atmospheric pressure, the exhaust control valve 13 is opened to exhaust.

In this embodiment, the spraying device includes a liquid nitrogen pipeline 4 installed in the jacket layer and a plurality of atomizing nozzles 5, and the liquid nitrogen sprayed from the atomizing nozzles 5 passes through the blower fan The effect of 2 is sent to the fruit and vegetable storage and transportation area in the casing. In order to make the temperature field in the box uniform and prevent liquid nitrogen droplets from dripping on fruits and vegetables to cause frostbite, the liquid nitrogen pipelines need to be wrapped with thermal insulation materials. The atomizing nozzle is preferably a hollow cone atomizing nozzle.

In this embodiment, the oxygen concentration detection device 11 is an oxygen concentration sensor; the temperature detection device 12 is a temperature sensor; and the pressure detection device is a pressure sensor.

After the liquid nitrogen atomized droplets are sprayed from the nozzle, through the jacketed air supply method that can supply air more uniformly, not only the denser liquid nitrogen droplets are blown more evenly, but also some of the droplets are vaporized. The jacketed air supply method is used to spray the liquid nitrogen to supply air, which solves the problem of uneven temperature field in the box and avoids frostbite of low-temperature liquid nitrogen droplets on fruits and vegetables.

When the temperature value monitored by the temperature sensor in the fruit and vegetable storage and transportation area is higher than the set value, and the oxygen concentration value monitored by the oxygen concentration sensor is greater than or equal to the set value, the controller controls the spray control valve to discharge liquid; if the oxygen concentration sensor monitors If the oxygen concentration value is less than the set value, then open the spray control valve and open the intake control valve at the same time. If the temperature value detected by the temperature sensor is less than or equal to the set value, the spray control valve is closed and the nitrogen filling is stopped; if the temperature value detected by the temperature sensor is greater than or equal to the set value, the oxygen concentration value is detected. If the temperature value monitored by the temperature sensor is less than or equal to the set value, the nitrogen filling is stopped. If the pressure in the fruit and vegetable storage and transportation area is greater than the atmospheric pressure, then open the exhaust control valve to exhaust. So again and again.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (5)

1. a jacket type liquid nitrogen spraying refrigerating box, comprises casing, it is characterized in that, described casing top goes out chuck layer by baffle for separating, and described dividing plate is provided with multiple exhaust vent; Be provided with liquid nitrogen spraying device in described chuck layer, described liquid nitrogen spraying device is connected with fluid reservoir by water influent pipeline, described water influent pipeline is provided with spray control valve and pressure charging valve; Be provided with breeze fan in described chuck layer, be provided with the air intake control valve be in communication with the outside in described chuck layer, described bottom half is provided with gas exhausting valve; Fruit and vegetable storage and transportation district in described casing is provided with oxygen concentration checkout gear, temperature-detecting device and pressure-detecting device; Described oxygen concentration checkout gear, temperature-detecting device, pressure-detecting device, spray control valve, air intake control valve are connected with controller respectively with gas exhausting valve; When the temperature value that described temperature-detecting device detects is more than or equal to setting value, then detect oxygen density value, if when the oxygen concentration of oxygen concentration detection arrangement monitors is more than or equal to setting value, then controller control spray control valve fills nitrogen to box house, if when the oxygen concentration of oxygen concentration detection arrangement monitors is less than setting value, then open air intake control valve while opening spray control valve; When the temperature value of temperature-detecting device monitoring is less than or equal to setting value, then close spray control valve, stop filling nitrogen; If when the pressure-detecting device pressure monitored in fruit and vegetable storage and transportation district is greater than atmospheric pressure, then open gas exhaust inspecting valve exhaust.

2. jacket type liquid nitrogen spraying refrigerating box according to claim 1, it is characterized in that, described spray equipment comprises and is installed on liquid nitrogen pipeline in described chuck layer and multiple atomizer, and the liquid nitrogen of described atomizer ejection is by the fruit and vegetable storage and transportation district in the effect feeding casing of described breeze fan.

3. jacket type liquid nitrogen spraying refrigerating box according to claim 1 and 2, is characterized in that, described oxygen concentration checkout gear is oxygen concentration sensor; Described temperature-detecting device is temperature sensor; Described pressure-detecting device is pressure sensor.

4. jacket type liquid nitrogen spraying refrigerating box according to claim 2, is characterized in that, described atomizer is hollow tapered atomizer.

5. jacket type liquid nitrogen spraying refrigerating box according to claim 3, is characterized in that, described liquid nitrogen pipeline is all enclosed with insulation material.