WO2020098279A1

WO2020098279A1 - Super-ice temperature refrigerator

Info

Publication number: WO2020098279A1
Application number: PCT/CN2019/092661
Authority: WO
Inventors: 董凯军; 孙钦
Original assignee: 中国科学院广州能源研究所
Priority date: 2019-04-29
Filing date: 2019-06-25
Publication date: 2020-05-22
Also published as: CN110131953B; CN110131953A; AU2019385786B2; AU2019385786A1

Abstract

A super-ice temperature refrigerator, comprising a super-ice temperature area (2), the super-ice temperature area (2) being internally provided with a cooling outer cavity (202), a phase change material cavity (203), a cooling inner cavity (204) and a concentration adjustment apparatus (205). The cooling outer cavity (202) covers the outer periphery of the phase change material cavity (203), and is used for creating a certain temperature environment for the phase change material cavity (203). The phase change material cavity (203) covers the outer periphery of the cooling inner cavity (204), and the phase change material cavity (203) is internally provided with a phase change material which implements phase change point adjustment by adjusting a solute concentration. The cooling inner cavity (204) is used for placing fresh products which require super-ice temperature storage. The concentration adjustment apparatus (205) is connected to the phase change material cavity (203), and is used for adjusting the solute concentration of the phase change material to adjust a phase change point so as to perform temperature control on the cooling inner cavity (204). The refrigerator expands the temperature control range of traditional refrigerators, has high super-ice temperature area control accuracy and low temperature fluctuation, and can implement super-ice temperature storage for different fresh products.

Description

Super ice temperature refrigerator

Technical field

The invention relates to an ultra-ice temperature storage technology, in particular to an ultra-ice temperature refrigerator.

Background technique

Super ice temperature storage technology is a kind of ice temperature technology that has been stored for a long time and can maintain the high quality of fresh products in recent years. It is to maintain the temperature of fresh products below the freezing point by adjusting the cooling rate and other special techniques. It is cold and does not freeze, maintaining the unique flavor of fresh products. Compared with ice temperature storage, its storage period can be extended by more than 1 times.

The storage temperature is required to be between the freezing point and the destruction point of fresh products during the storage process of super-ice temperature. This temperature area is called the super-ice temperature field. Different fresh products have different super-ice temperature areas. Generally, the super-ice temperature area of vegetables and fruits is lower in temperature, the super-ice temperature area of poultry is higher, and the super-ice temperature area of conventional fruits, vegetables, poultry, etc. is roughly -15. Within a certain temperature range between ℃ and 0 ℃, the accuracy of temperature control is extremely high. Traditional refrigerators generally only have a cold storage area above 0 ° C and a freezing area below -18 ° C. Usually, the refrigerant in the evaporator is used to evaporate the ambient heat, the temperature control accuracy is poor, and the temperature fluctuation is large, which cannot meet the requirements of super-ice temperature storage. .

Summary of the invention

The purpose of the present invention is to solve the shortcomings in the prior art, and to provide an ultra-ice temperature refrigerator, which can realize the ultra-ice temperature storage of fresh products.

To achieve the above objectives, the technical solutions of the present invention are:

An ultra-ice temperature refrigerator includes an ultra-ice temperature zone, and the ultra-ice temperature zone includes a cooling outer cavity, a phase change material cavity, a cooling inner cavity and a concentration adjustment device; the cooling outer cavity covers the periphery of the phase change material cavity, It is used to create a certain temperature environment for the phase change material cavity; the phase change material cavity covers the periphery of the cooling inner cavity, and the phase change material cavity is provided with a phase change material that can adjust the phase change point by adjusting the concentration of solute; the cooling inner cavity is used for Place fresh products that need to be stored under ultra-ice temperature; the concentration adjustment device is connected to the phase change material cavity, used to adjust the solute concentration of the phase change material and adjust the phase change point to achieve temperature control of the cooling inner cavity.

As an improvement of the present invention, it further includes a cold storage area and a freezing area. The temperature range of the cold storage area is 0-8 ° C, the temperature range of the super-ice temperature area is -15-0.5 ° C, and the temperature of the freezing area is lower than -18 ° C.

As an improvement of the present invention, the cooling outer cavity is provided with an air inlet and an air outlet, the air inlet is provided with a cooling / heating coil and a fan, and the cooling outer cavity is provided with an enhanced outer wall surface of the phase change material cavity Heat exchange ribs.

As another improvement of the present invention, the cooling outer cavity is provided with a cooling / heating coil in contact with the outer wall surface of the phase change material cavity.

As an improvement of the present invention, the concentration adjustment device includes a high-pressure pump, a semi-permeable membrane, and a solution tank. The semi-permeable membrane is disposed in the solution tank and divides the solution tank into a high-concentration solution area and a low-concentration solution area. The variable material chamber, the high-pressure pump, the high-concentration solution area, and the low-concentration solution area are sequentially connected to form a closed loop, and the phase-change material chamber, the high-pressure pump, and the high-concentration solution area are sequentially connected to form another closed loop.

As an improvement of the present invention, the concentration adjustment device further includes a solid particle concentration detection device, and the phase change material chamber, the high-pressure pump, and the solid particle concentration detection device are sequentially connected to form a closed loop.

As an improvement of the present invention, the concentration adjustment device further includes a liquid level sensor disposed in the phase change material cavity.

As an improvement of the present invention, when the refrigerator refrigeration system only has a refrigeration function, the concentration adjustment device further includes an electric heating device provided upstream of the high-pressure pump.

As an improvement of the present invention, the inner wall surface of the phase change material cavity is provided with parallel ribs, and a plurality of support ribs are provided at the bottom, and the parallel ribs and the support ribs are made of high thermal conductivity materials.

As an improvement of the present invention, the super-ice temperature zone further includes a heat-insulating outer wall and a heat-preservation door. A temperature monitoring display screen is provided on the heat-preservation door for real-time monitoring and adjusting the temperature in the super-ice temperature zone.

Compared with the prior art, the beneficial effects of the present invention are:

1. Increase the super-ice temperature zone, which enriches the temperature control range of the refrigerator;

2. Use the characteristics of low-temperature phase change materials to absorb heat and change phases without changing its own temperature, to maintain the temperature of the cooling cavity constant, the temperature fluctuation is small, the control accuracy is high, and it is easy to achieve super-ice temperature storage of fresh products.

3. Utilize the characteristics of semi-permeable membrane that can permeate the solvent but not the solute, and adopt the principle of reverse osmosis to control the solute concentration of the phase change material, so as to accurately control the temperature of the cooling inner cavity.

BRIEF DESCRIPTION

1 is a schematic structural diagram of an ultra-ice temperature refrigerator of the present invention;

2 is a schematic diagram 1 of the structure of the air in the super-ice temperature refrigerator in the super-ice temperature area of the present invention for cooling the outer cavity;

3 is a schematic structural view of a fin inside an ultra-ice temperature refrigerator phase change material cavity in an ultra-ice temperature refrigerator of the present invention;

4 is a schematic diagram of the structure of a cooling / heating coil in the cooling outer cavity of an ultra-ice temperature refrigerator of the present invention;

5 is a schematic diagram of the arrangement of the cooling / heating coil of the super-ice temperature refrigerator in the super-ice temperature zone of the present invention;

6 is a second schematic diagram showing the structure of the air in the super-ice temperature refrigerator in the super-ice temperature area of the present invention for cooling the outer cavity;

DESCRIPTION OF REFERENCE NUMERALS: 1-refrigeration zone; 2-super-ice temperature zone; 3-freezing zone; 201-insulation outer wall; 202-cooling outer cavity; 203-phase change material cavity; 204-cooling inner cavity; 205-concentration adjustment Device; 206-air inlet; 207-air outlet; 208-insulation door; 209-temperature monitoring display; 210-semi-permeable membrane; 211-low concentration solution area; 212-high concentration solution area; 213-high pressure pump; 214- Parallel fins; 215-supporting fins; 216-solid particle concentration detection device; 217-ribs; 218-heating / cooling coils; 219-level sensor; M-flow meter; V1-V6-valves.

detailed description

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in FIG. 1, an ultra-ice temperature refrigerator includes a refrigeration zone 1, an ultra-ice temperature zone 2, and a freezing zone 3. The super-ice temperature zone 2 is provided between the cold storage zone 1 and the freezing zone 3. The temperature range of the cold storage zone 1 is 0 to 8 ° C, the temperature range of the super-ice temperature zone 2 is -15 to -0.5 ° C, and the temperature of the freezing zone 3 is lower than -18 ° C.

As shown in FIG. 2, the super-ice temperature zone is a rectangular chamber enclosed by a heat-insulating outer wall 201 and a heat-insulating door 208, which is provided with a cooling outer chamber 202, a phase change material chamber 203, a cooling inner chamber 204 and a concentration Regulatory device 205. Both the thermal insulation door 208 and the thermal insulation outer wall 201 use thermal insulation materials with low thermal conductivity, such as polyurethane foamed plastic, aerogel thermal insulation material or vacuum insulation board. When the same material is used, the thermal insulation material of the thermal insulation door 208 is thicker than the thermal insulation outer wall 201 The thickness of the insulation material. The cooling inner cavity 204, the phase change material cavity 203, and the cooling outer cavity 202 are sequentially sleeved from the inside to the side of the super-ice temperature zone close to the heat preservation door 208, and the concentration adjusting device 205 is located on the other side of the super-ice temperature zone. The cooling inner cavity 204 is a rectangular cavity opened on one side, and is opened and closed by a heat insulation door 208. The phase change material cavity 203 is wrapped around the cooling inner cavity 204 except for the opening side, and the cooling outer cavity 202 is wrapped outside the phase change material cavity 203.

In this embodiment, the cooling outer cavity 202 is an air cavity, an air inlet 206 is provided on the upper side, an air outlet 207 is provided on the opposite side, and a rib 217 for strengthening heat exchange with the outer wall surface of the phase-change material cavity 203 is provided inside. The bottom of the tuyere 206 is provided with a cooling / heating coil and a fan (not shown in the figure). The cooling / heating coil is connected to the refrigeration system of the refrigerator to provide cold cooling or heat to enter the cooling outer chamber 202 Air and fan provide power for air circulation. The cooled or heated air enters the cooling outer cavity 202 through the air inlet 206, creating a low temperature environment or a high temperature environment for the periphery of the phase change material cavity 203.

The phase change material cavity 203 is provided with a phase change material that can adjust the phase change point by adjusting the solute concentration, such as a salt solution and an ethylene glycol solution. In order to prevent the vertical temperature difference caused by the uneven concentration of the upper and lower ice slurries caused by the ice slurry floating after the salt solution freezes, as shown in FIG. 3, a plurality of parallel ribs 214 are arranged at intervals on the inner wall surface of the phase change material cavity 203. The support strength of the phase change material cavity 203 is provided with a number of vertical support ribs 215 at the bottom. The body of the phase change material cavity 203 and the ribs (parallel ribs 214 and support ribs 215) are of good thermal conductivity Metal materials, such as copper, aluminum or corresponding alloys, etc., where the fins can also use high thermal conductivity plastic.

The cooling inner cavity 204 is used for placing fresh products that need to be stored in super ice temperature, and a temperature sensor (not shown in the figure) is provided inside.

The thermal insulation door 208 is provided with a temperature monitoring display screen 209 for displaying the temperature in the cooling cavity 204 obtained by monitoring, and at the same time has a temperature setting function, according to the super ice temperature field of different kinds of fresh products stored by the user Different, different cooling cavity temperature can be set by the user. The specific implementation method is the existing technology, which will not be repeated here.

The concentration adjustment device 205 includes a high-pressure pump 213, a semi-permeable membrane 210, a solution tank, a solid particle concentration detection device 216, valves V1-V6, and corresponding connecting pipes. When the refrigeration system of the refrigerator only has the refrigeration function, an electric heating device may be provided in the suction pipe section of the high-pressure pump 213. The semi-permeable membrane 210 is provided in a solution tank, and divides the solution tank into a high-concentration solution area 212 and a low-concentration solution area 211. The outlet of the phase-change material chamber 203 is connected to the inlet of the high-pressure pump 213 through the valve V6. The outlet of the high-pressure pump 213 is divided into two channels, one is connected to the inlet of the high-concentration solution area 212 through the valve V5, and the other is in turn through the valve V3 and the solid particle concentration detection device. 216. The valve V1 is connected to the inlet of the phase change material chamber 203. The outlet of the low-concentration solution area 211 passes through the flow meter M and the valve V2 in sequence, and is connected to the pipeline between the solid particle concentration detection device 216 and the valve V1. The outlet of the high-concentration solution zone 212 is connected to the pipeline between the high-pressure pump 213 and the valve V3 through the valve V4. The valve V3 and the solid particle concentration detection device 216 are connected in parallel at both ends of the solution tank to form a bypass pipe. The valve V3 is used to control the on-off of the bypass tube. The solid particle concentration detection device 216 is circulated by periodically turning on the high-pressure pump 213. Detect the concentration of solid particles in the phase change material cavity 203 (that is, the concentration of ice slurry) to control the start and stop of the cooling supply in the cooling outer cavity 202, so that the concentration of solid particles is always maintained within a certain range, if the phase change material is In the salt solution, the ice slurry concentration can be set to 30%, so that the temperature in the phase change material cavity 203 is always kept stable.

In order to better understand the operation of the super-ice temperature refrigerator of the present invention, a salt solution is taken as an example to explain the temperature adjustment steps in detail:

(1) The initial concentration of the salt solution in the phase change material cavity 203 is 23%, and the freezing point of the salt solution at this time is -15 ° C;

(2) When the temperature of the super-ice temperature zone set by the user increases, the concentration of the salt solution needs to be reduced. Open the heating operation to provide a high-temperature environment for cooling the outer cavity 202, melt all the low-temperature ice slurry in the phase-change material cavity 203 into a salt solution, then open the valves V1, V2, V5 and V6, and close the valves V3 and V4 to open The high-pressure pump 213 controls the starting time of the high-pressure pump 213 according to the concentration of the salt solution. The concentration of the salt solution can be calculated by the following algorithm: the desalination rate of the semi-permeable membrane 210 can reach more than 98%, then the initial concentration is m and the total mass of the salt solution is G. The mass passing through the semi-permeable membrane 210 is G1, and the concentration after termination of desalination is n, then n = (m · G-0.98m · G1) / G≈m · (G-G1) / G. The salt solution concentration and freezing point can be calculated according to the crystallization temperature formula of sodium chloride solution: T = -36.97n ² -57.28n + 0.1037, and the corresponding user set temperature T has a corresponding concentration n. After the specified concentration is reached, valves V2 and V5 are closed, valves V3 and V4 are opened, and the high-pressure pump 213 is used to fully circulate and evenly adjust the salt solution. After a certain period of time, the high-pressure pump 213 and all valves are closed, and the cooling operation is started. When the temperature of the cooling chamber 204 reaches After specifying the requirements, you can put in the fresh products that need to be stored in super ice temperature. After that, periodically open the valves V1, V3, and V6, and start the high-pressure pump 213 to bypass the circulation, monitor the ice slurry concentration, and control the cooling according to the change of the ice slurry concentration. Start and stop of the external cavity 202 refrigeration cycle.

(3) When the temperature of the super-ice temperature zone set by the user decreases, the concentration of the salt solution needs to be increased. First turn on the heating operation to melt all the low temperature ice slurry in the phase change material cavity 203 into a salt solution, then open the valves V1, V3, V4, V5 and V6, the valve V2 closes, turn on the high pressure pump 213, and fully circulate all the salt solution, Return it to the initial concentration of step (1), and then circulate according to step 2. When the temperature of the cooling cavity 204 reaches the specified requirements, you can put in the fresh products that need to be stored in super ice temperature, and then periodically open the valve V1 V3 and V6, the valves V2, V4 and V5 are closed, the high-pressure pump 213 is turned on for bypass circulation, the ice slurry concentration is monitored, and the refrigeration cycle of the cooling outer chamber 204 is controlled to start and stop according to the change of the ice slurry concentration.

Example 2

As shown in FIG. 4, an ultra-ice temperature refrigerator differs from Embodiment 1 in that the cooling outer cavity 204 of this embodiment is provided with a cooling / heating coil 218 as shown in FIG. The heat coil 218 is in contact with the outer wall surface (including the side wall, top, and bottom) of the phase change material cavity 203. The cooling / heating coil 218 is connected to the refrigeration system of the refrigerator, and creates a low temperature environment or a high temperature environment for the phase change material chamber 203 through heat exchange.

Example 3

As shown in FIG. 6, an ultra-ice temperature refrigerator differs from Embodiment 1 in that this embodiment removes the solid particle concentration detection device 216, and a liquid is provided on each side of the phase change material chamber 203 without fins The position sensor 219 is used to detect the height of the solid-liquid mixture. Since the volume of the liquid will change after the phase transition of the liquid, the solid particulate content of the solid-liquid mixture is calculated from the total height of the entire solid-liquid mixture. When the height of the mixture reaches the upper limit, it means that the solid particulate content is enough. Turn off the refrigeration. When the height of the mixture is below the lower limit, turn on the refrigeration.

The above embodiments are only for explaining the technical concept and features of the present invention, and the purpose thereof is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, but not to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the present invention should be covered in the protection scope of the present invention.

Claims

An ultra-ice temperature refrigerator includes an ultra-ice temperature zone, characterized in that: the ultra-ice temperature zone includes a cooling outer cavity, a phase change material cavity, a cooling inner cavity and a concentration adjustment device; the cooling outer cavity is covered with a phase change The periphery of the material cavity is used to create a certain temperature environment for the phase change material cavity; the phase change material cavity covers the periphery of the cooling inner cavity, and the phase change material cavity is provided with a phase change material that adjusts the phase change point by adjusting the solute concentration; cooling The inner cavity is used for placing fresh products that need to be stored in super-ice temperature; the concentration adjustment device is connected to the phase change material cavity, and is used to adjust the solute concentration of the phase change material to adjust the phase change point to achieve temperature control of the cooling inner cavity.
The ultra-ice temperature refrigerator according to claim 1, further comprising a cold storage area and a freezing area, the temperature range of the cold storage area is 0-8 ° C, and the temperature range of the ultra-ice temperature area is -15 ~ -0.5 ° C, The temperature in the freezing zone is lower than -18 ℃.
An ultra-ice temperature refrigerator according to claim 1, wherein the cooling outer cavity is provided with an air inlet and an air outlet, and the air inlet is provided with a cooling / heating coil and a fan to cool the inner cavity It is provided with ribs to strengthen heat exchange with the outer wall of the phase change material cavity.
An ultra-ice temperature refrigerator according to claim 1, wherein the cooling outer cavity is provided with a cooling / heating coil in contact with the outer wall surface of the phase change material cavity.
An ultra-ice temperature refrigerator according to claim 1, characterized in that the concentration adjustment device includes a high-pressure pump, a semi-permeable membrane and a solution tank, the semi-permeable membrane is provided in the solution tank to divide the solution tank into high The concentration solution area and the low concentration solution area, the phase change material cavity, the high-pressure pump, the high concentration solution area, and the low concentration solution area are sequentially connected to form a closed loop, and the phase change material cavity, the high pressure pump, and the high concentration solution area are sequentially connected to form another Close the loop.
An ultra-ice temperature refrigerator according to claim 5, wherein the concentration adjusting device further comprises a solid particulate concentration detection device, the phase change material chamber, the high-pressure pump, and the solid particulate concentration detection device are sequentially connected to form a closed loop .
An ultra-ice temperature refrigerator according to claim 5, wherein the concentration adjusting device further includes a liquid level sensor disposed in the phase change material cavity.
An ultra-ice temperature refrigerator according to claim 5, wherein when the refrigerator refrigeration system only has a refrigeration function, the concentration adjustment device further includes an electric heating device provided upstream of the high-pressure pump.
An ultra-ice temperature refrigerator according to claim 1, wherein the inner wall of the phase change material cavity is provided with parallel ribs, and the bottom is provided with a number of support ribs, both parallel ribs and support ribs are used Made of high thermal conductivity material.
The super-ice temperature refrigerator according to claim 1, characterized in that: the super-ice temperature zone further includes a heat preservation outer wall and a heat preservation door, the heat preservation door and the heat preservation outer wall are made of heat insulation materials with low thermal conductivity, when When the same material is used, the thickness of the thermal insulation door is greater than that of the thermal insulation outer wall. The thermal insulation door is provided with a temperature monitoring display screen for real-time monitoring and adjusting the temperature in the super-ice temperature zone.