CN210248197U - Cold accumulation type vacuum precooling system - Google Patents

Cold accumulation type vacuum precooling system Download PDF

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Publication number
CN210248197U
CN210248197U CN201920696961.9U CN201920696961U CN210248197U CN 210248197 U CN210248197 U CN 210248197U CN 201920696961 U CN201920696961 U CN 201920696961U CN 210248197 U CN210248197 U CN 210248197U
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vacuum
cold
ice
precooling
storage
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CN201920696961.9U
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Inventor
代灿丽
冯仁君
刘静
朱若红
孙玉会
段会荣
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Zhengzhou Kaixue Cold Chain Co ltd
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Zhengzhou Kaixue Cold Chain Co ltd
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Abstract

The utility model discloses a cold accumulation type vacuum precooling system, which comprises a vacuum system and a cold accumulation system; the vacuum system comprises a vacuum box provided with a sealing door, a vacuum degree sensor and a pressure release valve, a vacuum pump, a vacuum valve and a water catcher; the cold accumulation system consists of a compressor, a condenser, a liquid storage tank, a drying filter, an expansion valve, an ice cold accumulation steam collector and a steam-liquid separator; the ice-storage steam collector consists of a closed cavity, an air collecting pipe and an evaporator, wherein the air collecting pipe and the evaporator are arranged in the closed cavity. The utility model discloses a cold source is the ice cold-storage for change the high cold volume demand in the precooling process into long-time cold-storage process, effectively reduced the refrigerating unit specification, the decline range exceeds 50%. Meanwhile, the ice cold accumulation density is large, the cold storage capacity with limited volume can meet the huge cold load required by precooling, the equipment investment of the cold accumulation type vacuum precooling system is greatly reduced, and the product competitiveness of the precooler is enhanced. Meanwhile, the ice storage steam collector has simple structure and convenient installation.

Description

Cold accumulation type vacuum precooling system
Technical Field
The utility model relates to a fresh-keeping transportation field of fruit vegetables cold chain especially relates to cold-storage type vacuum precooling system.
Background
Precooling is a key step for keeping the product quality and prolonging the shelf life, and is also the first link of the fruit and vegetable cold chain. The traditional precooling method comprises refrigeration house precooling, differential pressure precooling, ice water precooling and vacuum precooling. The vacuum pre-cooling is based on the principle that the water content of fruits and vegetables is evaporated so as to reduce the temperature, and the evaporation of the water content depends on the reduction of the pressure of the environment.
Vacuum precooling is developed rapidly in recent years by virtue of the advantages of high precooling speed, low energy consumption, good quality maintenance and good microorganism inhibition effect, and the like, and is widely applied to precooling of leaf vegetables, fresh flowers, cooked foods and mushrooms. However, vacuum pre-cooling also has disadvantages: because the precooling process is fast, the cold quantity consumption is large, and the conventional vacuum system needs to be provided with a large-size cold accumulation system to supplement and collect flash steam, the cold accumulation type vacuum precooling system is inevitably expensive in manufacturing cost, and the popularization and the application of the cold accumulation type vacuum precooling system are limited. Therefore, the problem of reducing the initial investment of the cold accumulation type vacuum precooling system and meeting the instantaneous high cold quantity requirement is the subject of continuous research by the technical personnel in the field.
Disclosure of Invention
An object of the utility model is to provide a cold-storage type vacuum precooling system that initial investment cost is low, work efficiency is high.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model discloses a cold accumulation type vacuum precooling system, which comprises a vacuum system and a cold accumulation system; the vacuum system comprises a vacuum box provided with a sealing door, a vacuum degree sensor and a pressure release valve, a vacuum pump, a vacuum valve and a water catcher; the cold accumulation system consists of a compressor, a condenser, a liquid storage tank, a drying filter, an expansion valve, an ice cold accumulation steam collector and a steam-liquid separator; the ice-storage steam collector consists of a closed cavity, an air collecting pipe and an evaporator, wherein the air collecting pipe and the evaporator are arranged in the closed cavity; the vacuum box is communicated with the air collecting pipe inlet through a vacuum pumping pipeline, and the air collecting pipe outlet is communicated with the vacuum pump pumping port through the water catcher and the vacuum valve; the air outlet of the compressor is communicated with the inlet of the evaporator through the condenser, the liquid storage tank, the drying filter and the expansion valve, and the outlet of the evaporator is communicated with the liquid inlet of the compressor through the vapor-liquid separator; an ice-water mixture and a liquid level sensor for detecting the ice amount are arranged in the closed cavity; the control input ends of the vacuum pump, the vacuum valve, the pressure release valve and the compressor are respectively connected with the control output end of the controller, and the detection signal output ends of the vacuum degree sensor and the liquid level sensor are respectively connected with the signal input end of the controller.
The evaporator is of a coil pipe type structure, and the air collecting pipe is of a U-shaped pipe structure.
The bottom of the air collecting pipe of the U-shaped pipe structure extends out of the closed cavity, and a water drain valve is arranged on the air collecting pipe extending out of the closed cavity.
The vacuum system and the cold accumulation system operate independently; the work of the vacuum system is determined by the precooling and cooling process of the materials, and the work of the cold accumulation system is determined by the ice accumulation amount of the ice accumulation steam collector, namely, the ice amount signal detected by the liquid level sensor.
The utility model discloses a cold source is the ice cold-storage for change the cold volume demand of the high cold volume of precooling in-process into long-time cold-storage process, at vacuum system's precooling work intermittent type time promptly, the cold-storage system can not work intermittently, truns into the high precooling load demand of short time into long-time refrigeration cold-storage process, has effectively reduced the refrigerating unit specification, and the decline range exceeds 50%. Meanwhile, the ice cold accumulation density is large, the cold storage capacity with limited volume can meet the huge cold load required by precooling, the equipment investment of the cold accumulation type vacuum precooling system is greatly reduced, the product competitiveness of the precooler is enhanced, and the popularization and the application of the vacuum precooling are facilitated. Meanwhile, the ice storage steam collector has simple structure and convenient installation.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the cool storage type vacuum pre-cooling system of the present invention comprises a vacuum system and a cool storage system.
The vacuum system consists of a vacuum box 2 provided with a sealing door, a vacuum degree sensor and a pressure release valve 1, a vacuum pump 3, a vacuum valve 4 and a water catcher 5; the cold accumulation system consists of a compressor 6, a condenser 7, a liquid storage tank 8, a drying filter 9, an expansion valve 10, an ice cold accumulation steam collector 11 and a steam-liquid separator 12.
The ice-storage steam collector 11 consists of a closed cavity, a U-shaped air collecting pipe 13 arranged in the closed cavity, a coil evaporator 14 and an ice-water mixture 15 filled in the closed cavity; the bottom of the U-shaped air header 13 extends out of the closed chamber, and an electric control drain valve 16 is arranged on the U-shaped air header 13 extending out of the closed chamber.
The vacuum box 2 is communicated with the inlet of the U-shaped air collecting pipe 13 through a vacuum pumping pipeline, and the outlet of the U-shaped air collecting pipe 13 is communicated with the pumping hole of the vacuum pump 3 through the water catcher 5 and the vacuum valve 4. A liquid outlet of the compressor 6 is communicated with an inlet of the coil evaporator 14 through a condenser 7, a liquid storage tank 8, a drying filter 9 and an expansion valve 10, and an outlet of the coil evaporator 14 is communicated with a liquid inlet of the compressor 6 through a vapor-liquid separator 12; a liquid level sensor 17 for detecting the ice content of the ice-water mixture 15 is arranged in the closed cavity; the control input ends of the vacuum pump 3, the vacuum valve 4, the pressure relief valve 1 and the compressor 6 are respectively connected with the control output end, and the detection signal output ends of the vacuum degree sensor and the liquid level sensor 17 are respectively connected with the signal input end.
The working principle of the liquid level sensor 17 for detecting the ice amount in the closed cavity is briefly described as follows:
when the water freezing volume expansion in the closed cavity reaches the set upper limit of the liquid level (the cold accumulation amount is higher than the set value), the liquid level sensor 17 outputs a signal to the control system, outputs a stop control signal to the compressor 6, and controls the compressor 6 to stop refrigerating so as to maintain a certain amount of ice accumulation amount to meet the cold consumption in the precooling process.
When the ice melting volume in the closed cavity is reduced to a set liquid level lower limit (the cold accumulation amount is lower than a set value), the liquid level sensor 17 outputs a signal to the control system, outputs a working control signal to the compressor 6, and controls the compressor 6 to start refrigeration.
The utility model discloses the theory of operation is as follows briefly:
after the material 18 is placed in the vacuum box 2, the sealing door is closed, the vacuum pump 3 and the vacuum valve 4 are opened, and the pressure in the vacuum box 2 is gradually reduced from the normal pressure. At the moment, the boiling point of water is reduced along with the reduction of the pressure, and the moisture of the material 18 is vaporized and evaporated into water vapor through heat absorption so that the temperature of the material 18 is reduced. The gas in the vacuum box 2 firstly enters the air collecting pipe 13 of the ice storage steam collector 11 through a vacuum pumping pipeline, the flash steam in the gas contacts with the inner wall of the low-temperature air collecting pipe 13 to be condensed into water, and the water is discharged through the electric control water drain valve 16; the uncondensed gas is collected by the gas header 13, further water vapor is removed by the water catcher 5, and finally the gas is discharged by the vacuum pump 3. When the temperature of the material 18 reaches a set value, the vacuum valve 4 is closed, the vacuum pump 3 is stopped after delaying for 5min, the pressure release valve 1 is opened at the moment, outside air enters the vacuum box 2 through the pressure release valve 1 for repressurization, after the repressurization is finished, the sealing door is opened, and the material 18 can be taken out.
Superheated steam of a high-temperature high-pressure refrigerant is discharged from a compressor 6, enters a condenser 7, radiates heat to ambient air, is changed into saturated refrigerant liquid, enters a liquid storage tank 8, passes through a drying filter 9, enters an expansion valve 10, is throttled into a low-pressure low-temperature steam-liquid mixture, enters a coil evaporator 14 in an ice storage steam collector 11, is gradually cooled and frozen, and is evaporated and absorbed by the refrigerant, and then is sucked into the compressor through a steam-liquid separator 12 to circulate 6 for refrigeration.
The vacuum system and the cold accumulation system operate independently; the work of the vacuum system is determined by the precooling and cooling process of the materials, and the work of the cold accumulation system is determined by the ice accumulation amount of the ice accumulation steam collector, namely, the ice amount signal detected by the liquid level sensor.
The cold accumulation system not only can accumulate cold energy at high density, but also can realize high-efficiency cold discharge, and can meet the demand of precooling instantaneous high cold energy through the rapid ice melting capability.

Claims (4)

1. A cold accumulation type vacuum precooling system comprises a vacuum system and a cold accumulation system; the method is characterized in that: the vacuum system comprises a vacuum box provided with a sealing door, a vacuum degree sensor and a pressure release valve, a vacuum pump, a vacuum valve and a water catcher; the cold accumulation system consists of a compressor, a condenser, a liquid storage tank, a drying filter, an expansion valve, an ice cold accumulation steam collector and a steam-liquid separator; the ice-storage steam collector consists of a closed cavity, an air collecting pipe and an evaporator, wherein the air collecting pipe and the evaporator are arranged in the closed cavity; the vacuum box is communicated with the air collecting pipe inlet through a vacuum pumping pipeline, and the air collecting pipe outlet is communicated with the vacuum pump pumping port through the water catcher and the vacuum valve; the air outlet of the compressor is communicated with the inlet of the evaporator through the condenser, the liquid storage tank, the drying filter and the expansion valve, and the outlet of the evaporator is communicated with the liquid inlet of the compressor through the vapor-liquid separator; an ice-water mixture and a liquid level sensor for detecting the ice amount are arranged in the closed cavity; the control input ends of the vacuum pump, the vacuum valve, the pressure release valve and the compressor are respectively connected with the control output end of the controller, and the detection signal output ends of the vacuum degree sensor and the liquid level sensor are respectively connected with the signal input end of the controller.
2. The cold-storage vacuum pre-cooling system of claim 1, wherein: the evaporator is of a coil pipe type structure, and the air collecting pipe is of a U-shaped pipe structure.
3. The cold-storage vacuum pre-cooling system of claim 2, wherein: the bottom of the air collecting pipe of the U-shaped pipe structure extends out of the closed cavity, and a water drain valve is arranged on the air collecting pipe extending out of the closed cavity.
4. The cold-storage vacuum pre-cooling system according to claim 1 or 2, wherein: the vacuum system and the cold accumulation system operate independently; the work of the vacuum system is determined by the precooling and cooling process of the materials, and the work of the cold accumulation system is determined by the ice accumulation amount of the ice accumulation steam collector, namely, the ice amount signal detected by the liquid level sensor.
CN201920696961.9U 2019-05-16 2019-05-16 Cold accumulation type vacuum precooling system Active CN210248197U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920696961.9U CN210248197U (en) 2019-05-16 2019-05-16 Cold accumulation type vacuum precooling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920696961.9U CN210248197U (en) 2019-05-16 2019-05-16 Cold accumulation type vacuum precooling system

Publications (1)

Publication Number Publication Date
CN210248197U true CN210248197U (en) 2020-04-07

Family

ID=70024999

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920696961.9U Active CN210248197U (en) 2019-05-16 2019-05-16 Cold accumulation type vacuum precooling system

Country Status (1)

Country Link
CN (1) CN210248197U (en)

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