Flexible and efficient freezing and thawing device and freezing and thawing method thereof

Abstract

The present invention relates to a flexible and efficient freezing and thawing device and freezing and thawing method thereof, including a freezing and thawing chamber, wherein a heat exchange plate is arranged in the freezing and thawing chamber, wherein the heat exchange plate comprises a porous heat exchange plate and a non-porous heat exchange plate, wherein the surface of the porous heat exchange plate is provided with a plurality of pores, and both the porous heat exchange plate and the non-porous heat exchange plate can be detachably installed in the freezing and thawing chamber; a refrigeration and thawing mechanism comprises a refrigerator and a medium distributor, wherein a heater and a circulation pump are arranged between the refrigerator and the medium distributor, and a plurality of distribution pipes are arranged on the medium distributor, wherein each distribution pipe is connected to the cavity of a porous heat exchange plate or a non-porous heat exchange plate, wherein the freezing and thawing chamber is connected to the refrigerator via a first circulation pipe, and the cavity of the non-porous heat exchange plate is connected to the refrigerator via a second circulation pipe. The present invention can be used for batch freezing of articles of various sizes and shapes, and can also freeze articles of various sizes and shapes at the same time, and has a thawing function, meeting the thawing requirements of some frozen articles.

Description

Technical Field

[0001] The invention relates to the field of freezing technology, in particular to a flexible and efficient freezing and thawing device and a freezing and thawing method thereof. Background Art

[0002] Many biological products, foods, and chemicals are stored frozen to maintain their product functions and extend their shelf life. Ultra-low temperature refrigerators are often used directly as freezing equipment on the market, and there are also programmed cooling devices, but these devices do not have heating and thawing functions. Programmed cooling devices usually use liquid nitrogen or compressor refrigeration, and set up fans in the freezing chamber to promote cold air circulation and accelerate the cooling of items. However, such a freezing process has the problem of uneven temperature distribution in the chamber and inconsistent cooling rates of items in different positions, resulting in differences in the quality of the same batch of products after freezing, causing challenges in quality control and evaluation. For the method of directly passing liquid nitrogen into the freezing chamber, there is also a risk of liquid nitrogen injuring the operator. Directly passing the heat exchange medium into the freezing chamber also has the problem of high energy consumption.

[0003] There are also devices on the market that use multi-layer flat plate contact heat transfer and circulate silicone oil in the flat plate for cooling and heating. Although the flat plate heat transfer improves the uniformity of temperature distribution, this type of equipment requires the product to be frozen and thawed to form good contact with the flat plate equipment, otherwise the heat transfer efficiency is very poor and it cannot adapt to a variety of freezing containers and sizes. At the same time, the circulating silicone oil also has the risk of leakage in the chamber and causing product contamination.

[0004] CN201822204088.5 discloses an independent refrigeration unit for a refrigerated truck with uniform heat dissipation, wherein a plurality of air holes are arranged on a fixed plate at the bottom of the refrigerated box body, and cold air is ejected from the air holes to refrigerate objects placed on the fixed plate. This refrigeration method improves the uniformity of refrigeration to a certain extent, but the device does not have a re-thawing function, and the fixed plate is fixedly installed, and the number of fixed plates cannot be flexibly adjusted according to the shape and size of the object, making it difficult to freeze objects of different sizes at the same time. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flexible and efficient freezing and thawing device and freezing and thawing method thereof, which can be used for batch freezing of objects of various sizes and shapes, and can also freeze objects of various sizes and shapes at the same time, and has a thawing function to meet the thawing needs of some frozen objects.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a flexible and efficient freezing and thawing device, including a freezing and thawing chamber, in which a plurality of heat exchange plates are arranged, and the heat exchange plates have cavities inside, and the cavity is connected to a refrigeration and thawing mechanism.

[0007] The heat exchange plate includes a porous heat exchange plate and a non-porous heat exchange plate. The surface of the porous heat exchange plate is provided with a plurality of pores communicating with the cavity. Both the porous heat exchange plate and the non-porous heat exchange plate can be detachably installed in the freezing and rethawing chamber.

[0008] The refrigeration and rethawing mechanism includes a refrigerator and a medium distributor connected to each other, a heater and a circulation pump are arranged between the refrigerator and the medium distributor, the medium distributor has a storage cavity inside, and a plurality of distribution pipes connected to the storage cavity are arranged on the medium distributor, each distribution pipe is connected to the cavity of a porous heat exchange plate or a non-porous heat exchange plate, the freezing and rethawing chamber is connected to the refrigerator through a first circulation pipe, and the cavity of the non-porous heat exchange plate is connected to the refrigerator through a second circulation pipe.

[0009] Furthermore, the heights of the porous heat exchange plate and the non-porous heat exchange plate are adjustable.

[0010] Furthermore, a movable bracket is provided in the freezing and rethawing chamber, and the porous heat exchange plate and the non-porous heat exchange plate can be detachably mounted on the movable bracket.

[0011] Furthermore, a first temperature sensor is provided in the freezing and rethawing chamber, a second temperature sensor is provided on the side walls of the porous heat exchange plate and the non-porous heat exchange plate, and a third temperature sensor is provided on the first circulation pipe and the second circulation pipe.

[0012] Furthermore, the pores of the porous heat exchange plate are arranged on the upper surface of the porous heat exchange plate.

[0013] Furthermore, the pores of the porous heat exchange plate are arranged on the lower surface of the porous heat exchange plate.

[0014] Furthermore, both the upper surface and the lower surface of the porous heat exchange plate are provided with pores.

[0015] The freeze-thaw method of the above-mentioned flexible and efficient freeze-thaw device,

[0016] When the items are packaged in frozen bottles, the frozen bottles are placed on the porous heat exchange plate, and then the refrigerant is driven to flow continuously through the refrigerator, and the circulation pump is started at the same time to drive the gas to circulate. When the gas flows through the refrigerator, it becomes cold air, which enters the cavity of the porous heat exchange plate through the medium distributor and the distribution pipeline, and then sprays out from each air hole to cool the frozen bottles. The gas in the freezing and thawing chamber flows to the refrigerator through the first circulation pipe to realize circulation; when thawing, the refrigerator is turned off and the heater is turned on at the same time;

[0017] When the items are packaged in a freezing box with flat upper and lower surfaces, the freezing box is placed on the non-porous heat exchange plate, and the distance between two adjacent non-porous heat exchange plates is adjusted so that the upper surface of the freezing box fits with the upper non-porous heat exchange plate; then the refrigerant is driven to flow continuously through the refrigerator, and the circulating pump is started at the same time to drive the heat exchange medium to circulate. The heat exchange medium becomes a cold medium when flowing through the refrigerator, and the cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor and the distribution pipeline, and cools the freezing box by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the refrigerator through the second circulation pipe to realize circulation; when thawing, the refrigerator is turned off and the heater is turned on at the same time.

[0018] Furthermore, when the items are packaged in flexible bags, the bags are first placed in a freezing box, and the non-porous heat exchange plate is installed at an angle, and then the freezing box is placed on the inclined non-porous heat exchange plate, and the distance between two adjacent non-porous heat exchange plates is adjusted so that the upper surface of the freezing box fits with the upper non-porous heat exchange plate; then the refrigerant is driven to flow continuously through the refrigerator, and the circulating pump is started at the same time to drive the heat exchange medium to circulate. The heat exchange medium becomes a cold medium when flowing through the refrigerator, and the cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor and the distribution pipeline, and the freezing box is cooled by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the refrigerator through the second circulation pipe to realize circulation; when thawing, the refrigerator is turned off and the heater is turned on at the same time.

[0019] Furthermore, when the height of the frozen bottle is relatively large, a porous heat exchange plate with air holes on both the upper and lower surfaces is used. Cold air is ejected from the upper and lower surfaces of the porous heat exchange plate simultaneously to evenly cool the upper and lower parts of the frozen bottle. During the thawing process, the sample is oscillated by the reciprocating motion of the mobile bracket to accelerate the thawing.

[0020] The beneficial effects of the present invention are: 1. By setting a heater, the frozen items can be heated and thawed when they are taken out as needed. 2. The multiple air holes evenly arranged on the porous heat exchange plate can spray cold air evenly, and the cold air can be evenly distributed around the frozen bottle, so that the frozen bottle is evenly cooled; and by respectively attaching the upper and lower surfaces of the cryopreservation box to two adjacent non-porous heat exchange plates, the upper and lower surfaces of the cryopreservation box are evenly cooled by heat exchange. 3. Since the porous heat exchange plate and the non-porous heat exchange plate are detachable and installable, the heat exchange plate can be replaced according to the container for storing frozen items. For example, all porous heat exchange plates can be used, or all non-porous heat exchange plates can be used, or non-porous heat exchange plates and porous heat exchange plates can be used at the same time. In this way, batch freezing of items of various sizes and shapes can be achieved, and items of various sizes and shapes can be frozen at the same time. It is very flexible to use and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the present invention;

[0022] Figure 2 Schematic diagram of freezing and thawing of a porous heat exchange plate with air holes arranged on the upper surface;

[0023] Figure 3 Schematic diagram of freezing and thawing of a porous heat exchange plate with air holes arranged on the lower surface;

[0024] Figure 4 Schematic diagram of freezing and thawing of a porous heat exchange plate with air holes arranged on both the upper and lower surfaces;

[0025] Figure 5 It is a schematic diagram of freezing and thawing of a non-porous heat exchange plate;

[0026] Figure 6 It is a schematic diagram of freezing and thawing of bagged liquid;

[0027] Figure numerals: 1—freezing and thawing chamber; 2—heat exchange plate; 3—movable bracket; 4—medium distributor; 5—circulation pump; 6—refrigerator; 7—heater; 8—third temperature sensor; 9—second temperature sensor; 10—first temperature sensor; 11—frozen bottle; 12—freezing box; 13—bag body; 14—distribution pipeline; 15—second circulation pipe; 16—first circulation pipe. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 1 to 6 As shown, the flexible and efficient freezing and rethawing device of the present invention comprises a freezing and rethawing chamber 1, which is provided with a side door for easy access to items, and is covered with a heat preservation layer to reduce energy consumption. The freezing and rethawing chamber 1 is provided with a multi-layer heat exchange plate 2, and the heat exchange plate 2 has a cavity inside, and the cavity is connected to a refrigeration and rethawing mechanism.

[0030] The heat exchange plate 2 includes a porous heat exchange plate and a non-porous heat exchange plate. The surface of the porous heat exchange plate is provided with a plurality of pores connected to the cavity, and the pores are evenly distributed to ensure the uniformity of the gas output. The non-porous heat exchange plate is a plate without pores, and refrigeration is performed by heat exchange.

[0031] The porous heat exchange plate and the non-porous heat exchange plate can be detachably installed in the freezing and rethawing chamber 1, and the heat exchange plate 2 can be replaced according to the container for storing frozen items. For example, all porous heat exchange plates can be used, or all non-porous heat exchange plates can be used, or non-porous heat exchange plates and porous heat exchange plates can be used at the same time. In this way, batch freezing of items of various sizes and shapes can be achieved, and items of various sizes and shapes can be frozen at the same time. The use is very flexible and has a wide range of applications.

[0032] In addition, the height of the porous heat exchange plate and the non-porous heat exchange plate is adjustable, that is, the number and spacing of the porous heat exchange plate and the non-porous heat exchange plate can be adjusted. When the height of the object is small, the number of the porous heat exchange plate or the non-porous heat exchange plate can be increased to facilitate freezing or thawing more objects at the same time; and when the size of the object is large, the number of the porous heat exchange plate or the non-porous heat exchange plate can be reduced to increase the spacing between two adjacent heat exchange plates 2. In addition, the height of the non-porous heat exchange plate is adjustable, and it is used to place a freezing box 12 with a regular rectangular shape. The height of the non-porous heat exchange plate can be adjusted so that the upper surface of the freezing box 12 fits with the non-porous heat exchange plate above, thereby ensuring that the top and bottom of the freezing box 12 are evenly cooled and refrigerated.

[0033] The refrigeration and rethawing mechanism includes a refrigerator 6 and a medium distributor 4 connected to each other, a heater 7 and a circulation pump 5 are arranged between the refrigerator 6 and the medium distributor 4, the medium distributor 4 has a storage cavity inside, and a plurality of distribution pipes 14 connected to the storage cavity are arranged on the medium distributor 4, each distribution pipe 14 is connected to the cavity of a porous heat exchange plate or a non-porous heat exchange plate, the freezing and rethawing chamber 1 is connected to the refrigerator 6 through a first circulation pipe 16, and the cavity of the non-porous heat exchange plate is connected to the refrigerator 6 through a second circulation pipe 15.

[0034] The refrigerator 6 is used for refrigeration, and various existing refrigeration equipment such as compressors can be used. Preferably, a heat exchanger is used to exchange heat with an external refrigerant through a heat exchange medium, so that the temperature of the heat exchange medium is reduced. The heat exchange medium uses harmless air, water, etc. to replace the solution of directly introducing refrigerants such as liquid nitrogen into the freezing and thawing chamber 1, eliminating the risk of harm to workers caused by refrigerants such as liquid nitrogen, while reducing energy consumption.

[0035] The medium distributor 4 has a certain storage function, is vertically arranged, and can be a pipe. It is also used to disperse the heat exchange medium into each distribution pipe 14. The distribution pipe 14 can use a hose with a certain telescopic performance. Quick-release joints are arranged on the side walls of the porous heat exchange plate and the non-porous heat exchange plate, so that the distribution pipe 14 can be quickly removed from the porous heat exchange plate or the non-porous heat exchange plate when disassembling the porous heat exchange plate and the non-porous heat exchange plate, and the distribution pipe 14 can be quickly connected to the porous heat exchange plate or the non-porous heat exchange plate.

[0036] The circulation pump 5 is used to drive the heat exchange medium to circulate and realize circulating refrigeration. The heater 7 is a common heating device. When remelting is required, the refrigerator 6 can be turned off and the heater 7 can be started. The heat exchange medium is heated by the heater 7 to heat the items. The first circulation pipe 16 and the second circulation pipe 15 are used to transport the heat exchange medium to the refrigerator 6 and the heater 7 again to ensure the circulation of the heat exchange medium. The second circulation pipe 15 can be a hose with certain telescopic performance. At the same time, a quick-release joint is set on the side wall of the non-porous heat exchange plate, so that the second circulation pipe 15 can be quickly removed when the non-porous heat exchange plate is disassembled and assembled, and the second circulation pipe 15 can be quickly connected to the non-porous heat exchange plate.

[0037] The heat exchange medium can be harmless gas, such as air, etc. When the heat exchange plates 2 are all non-porous heat exchange plates and there are no porous heat exchange plates, the heat exchange medium can be gas, such as air, etc., or liquid, such as water, ethylene glycol, silicone oil, etc. When the heat exchange plates 2 are all porous heat exchange plates or part of them are porous heat exchange plates, the heat exchange medium is gas, preferably air.

[0038] The porous heat exchange plate and the non-porous heat exchange plate can be directly installed on the inner wall of the freezing and rethawing chamber 1. In order to facilitate the disassembly and assembly of the porous heat exchange plate and the non-porous heat exchange plate, and the taking and placing of articles, a mobile bracket 3 is provided in the freezing and rethawing chamber 1, and the porous heat exchange plate and the non-porous heat exchange plate can be detachably installed on the mobile bracket 3. The bottom of the mobile bracket 3 is provided with rollers, which can push the mobile bracket 3 to move as a whole. During the rethawing process, the sample can be oscillated by the reciprocating movement of the mobile bracket 3 to accelerate the rethawing; when disassembling the heat exchange plate 2 or taking and placing articles, the mobile bracket 3 can be pushed outside the freezing and rethawing chamber 1, and then the operation is carried out to ensure sufficient operating space and improve the operating efficiency.

[0039] In order to facilitate the adjustment of the height of the porous heat exchange plate and the non-porous heat exchange plate, the movable bracket 3 can be provided with multiple vertical screws, and multiple sleeves that slide with the screws are provided on the screws. A support nut that fits the screw thread is provided below each sleeve. The porous heat exchange plate and the non-porous heat exchange plate can be detachably mounted on the sleeve, and the sleeve is supported by the support nut. By rotating the support nut, the height of the sleeve and the porous heat exchange plate and the non-porous heat exchange plate can be adjusted. The porous heat exchange plate and the non-porous heat exchange plate can be installed on the sleeve by bolts, or by pins, pin shafts, etc.

[0040] The freezing and rethawing chamber 1 is provided with a first temperature sensor 10, the side walls of the porous heat exchange plate and the non-porous heat exchange plate are provided with a second temperature sensor 9, and the first circulation pipe 16 and the second circulation pipe 15 are provided with a third temperature sensor 8. The first temperature sensor 10, the second temperature sensor 9 and the third temperature sensor 8 detect the temperature of different parts respectively, and adjust the flow rate of the refrigerant, the speed of the circulation pump 5 and the power of the heater 7 according to the detection results, so as to accurately control the freezing temperature, the cooling or heating rate and other indicators, and realize the controllability of the entire freezing or rethawing process.

[0041] There are many types of porous heat exchange plates. One is that the pores are set on the upper surface of the porous heat exchange plate, such as Figure 2 As shown; the second is that the pores are arranged on the lower surface of the porous heat exchange plate, such as Figure 3 As shown; third, both the upper and lower surfaces are provided with pores, such as Figure 4 As shown. According to the specific size of the packaging container, a suitable porous heat exchange plate is selected. For example, when the packaging container is a frozen bottle 11 with a relatively small height, a porous heat exchange plate with air holes on the upper surface can be used, and the heat exchange medium is uniformly sprayed upwards. Alternatively, a porous heat exchange plate with air holes on the lower surface can be used, and the heat exchange medium is uniformly sprayed downwards. When the packaging container is a frozen bottle 11 with a relatively large height, a porous heat exchange plate with air holes on both the upper and lower surfaces can be used, and the heat exchange medium is sprayed in both the upper and lower directions at the same time, so that the upper and lower parts of the frozen bottle 11 are uniformly surrounded by the heat exchange medium, thereby ensuring the uniformity of cooling or heating.

[0042] The freeze-thaw method of the above-mentioned flexible and efficient freeze-thaw device is:

[0043] When the items are packaged by the frozen bottle 11, the frozen bottle 11 includes all the existing bottle bodies of various shapes and materials, and is refrigerated by a porous heat exchange plate. Specifically, the frozen bottle 11 is placed on the porous heat exchange plate, and then the refrigerant is driven to flow continuously through the heat exchanger, and the circulating pump 5 is started at the same time to drive the gas to circulate. When the gas flows through the heat exchanger, it releases heat and becomes cold air. The cold air enters the cavity of the porous heat exchange plate through the medium distributor 4 and the distribution pipe 14, and cools the bottom of the frozen bottle 11 through heat exchange, and then sprays out from each pore to cool the body of the frozen bottle 11. The gas in the freezing and thawing chamber 1 flows to the heat exchanger through the first circulation pipe 16 to achieve circulation. During thawing, turn off the refrigerator 6 and turn on the heater 7 at the same time. The heater 7 heats the gas into hot gas. The hot gas enters the porous heat exchange plate, and heats the bottom of the frozen bottle 11 through heat exchange. At the same time, the hot gas sprays out from each pore to heat the body of the frozen bottle 11. According to the size of the frozen bottle 11, select Figure 2 , Figure 3 and Figure 4When the height of the frozen bottle 11 is relatively large, a porous heat exchange plate with air holes on both the upper and lower surfaces is used, and cold air is ejected from the upper and lower surfaces of the porous heat exchange plate at the same time, so that the upper and lower parts of the frozen bottle 11 are evenly cooled.

[0044] When the items are packaged in a freezing box 12 with flat upper and lower surfaces, the freezing box 12 can be a rectangular parallelepiped or cylindrical box, or a box with a lower height such as an elliptical or heart-shaped upper and lower surfaces. The freezing box 12 is placed on a non-porous heat exchange plate, such as Figure 5 As shown, the distance between two adjacent non-porous heat exchange plates is adjusted so that the upper surface of the cryopreservation box 12 fits with the non-porous heat exchange plate above; then the refrigerant is driven to flow continuously through the heat exchanger, and the circulating pump 5 is started at the same time to drive the heat exchange medium to circulate. When the heat exchange medium flows through the heat exchanger, it releases heat and becomes a cold medium. The cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor 4 and the distribution pipe 14, and cools the cryopreservation box 12 by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the heat exchanger through the second circulation pipe 15 to realize circulation. When thawing, the refrigerator 6 is turned off and the heater 7 is turned on at the same time. During the thawing process, the sample can be oscillated by the reciprocating motion of the mobile bracket 3 to accelerate the thawing.

[0045] Generally speaking, the height of the cryo bottle 11 is greater than the diameter, and the upper part is small and the bottom is large. Therefore, the uniformity of cooling or heating can be ensured by exchanging heat at the bottom and spraying heat exchange gas around. Box-type containers generally have large upper and lower areas and small heights. If the method of exchanging heat at the bottom and spraying heat exchange gas around is also adopted, the part with a larger top area cannot be cooled or heated in time, resulting in uneven cooling or heating. Therefore, for the freezing box 12, the upper and lower surfaces are cooled or heated by simultaneous heat exchange. The heat exchange area is large, the cooling or heating efficiency is improved, and the cooling or heating rate of the upper and lower parts is guaranteed to be consistent. Due to its low height, the overall cooling or heating rate is also relatively uniform.

[0046] When items are packaged in a flexible bag 13, if the bag 13 is directly placed on a porous heat exchange plate or a non-porous heat exchange plate, since the bag 13 is flexible and has no fixed shape, the thickness of the liquid inside the bag 13 at different horizontal positions will be different, and the cooling or heating rates at the center of different thickness positions will be different, that is, it is difficult to ensure uniform cooling or heating at different thickness positions. Therefore, when freezing the liquid packaged in the bag 13, the bag 13 is first placed in the cryo box 12. If the cryo box 12 is placed horizontally, it is difficult for the upper surface of the bag 13 to completely fit with the top plate of the cryo box 12, which will also affect the uniformity of cooling or heating. Therefore, the non-porous heat exchange plate is installed at an angle, and then the cryo box 12 is placed on the inclined non-porous heat exchange plate. In this way, the cryo box 12 is also in a tilted state. Under the action of gravity, the liquid in the bag 13 fills the lower space of the bag 13 and squeezes the bag 13, and the state is as follows. Figure 6 As shown, it is ensured that the upper and lower surfaces of the bag body 13 are closely attached to the top plate and the bottom plate of the freezing box 12, respectively, so that the upper and lower surfaces of the bag body 13 can exchange heat evenly, and the liquid thickness at most positions is kept consistent, and the cooling or heating rate can be kept consistent. Then adjust the distance between the two adjacent non-porous heat exchange plates so that the upper surface of the freezing box 12 is attached to the non-porous heat exchange plate above; then drive the refrigerant to flow through the heat exchanger continuously, and start the circulation pump 5 at the same time to drive the heat exchange medium to circulate. When the heat exchange medium flows through the heat exchanger, it releases heat and becomes a cold medium. The cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor 4 and the distribution pipe 14, and cools the freezing box 12 by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the heat exchanger through the second circulation pipe 15 to realize circulation. When thawing, turn off the refrigerator 6 and turn on the heater 7 at the same time. During the thawing process, the sample can be oscillated by the reciprocating motion of the mobile bracket 3 to accelerate the thawing.

[0047] In summary, the present invention can perform batch freezing and thawing of items packaged in a certain bag body 13, freezing bottle 11 or freezing box 12, and can also perform mixed freezing and thawing of bag body 13, freezing bottle 11 or freezing box 12, and can adjust the height and number of porous heat exchange plates and non-porous heat exchange plates according to the height of the items. It is very flexible to use, has strong applicability, and has a wide range of applications. Different freezing and thawing methods are adopted according to the characteristics of bag body 13, freezing bottle 11 and freezing box 12, which effectively ensures the heat exchange uniformity of bag body 13, freezing bottle 11 and freezing box 12.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flexible and efficient freezing and rethawing device, comprising a freezing and rethawing chamber (1), wherein a plurality of heat exchange plates (2) are arranged in the freezing and rethawing chamber (1), wherein the heat exchange plates (2) have cavities inside, wherein the cavities are connected to a refrigeration and rethawing mechanism, and wherein: The heat exchange plate (2) comprises a porous heat exchange plate and a non-porous heat exchange plate, the surface of the porous heat exchange plate is provided with a plurality of pores communicating with the cavity, and the porous heat exchange plate and the non-porous heat exchange plate can be detachably installed in the freezing and rethawing chamber (1); The refrigeration and rethawing mechanism comprises a refrigerator (6) and a medium distributor (4) connected to each other, a heater (7) and a circulation pump (5) are arranged between the refrigerator (6) and the medium distributor (4), the medium distributor (4) has a storage cavity inside, and a plurality of distribution pipes (14) connected to the storage cavity are arranged on the medium distributor (4), each distribution pipe (14) is connected to the cavity of a porous heat exchange plate or a non-porous heat exchange plate, the freezing and rethawing chamber (1) is connected to the refrigerator (6) through a first circulation pipe (16), and the cavity of the non-porous heat exchange plate is connected to the refrigerator (6) through a second circulation pipe (15).

2. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: The heights of the porous heat exchange plates and the non-porous heat exchange plates are adjustable.

3. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: A movable bracket (3) is arranged in the freezing and rethawing chamber (1), and both the porous heat exchange plate and the non-porous heat exchange plate can be detachably mounted on the movable bracket (3).

4. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: A first temperature sensor (10) is arranged in the freezing and rethawing chamber (1), a second temperature sensor (9) is arranged on the side walls of the porous heat exchange plate and the non-porous heat exchange plate, and a third temperature sensor (8) is arranged on the first circulation pipe (16) and the second circulation pipe (15).

5. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: The air holes of the porous heat exchange plate are arranged on the upper surface of the porous heat exchange plate.

6. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: The air holes of the porous heat exchange plate are arranged on the lower surface of the porous heat exchange plate.

7. The flexible and efficient freezing and thawing device according to claim 1, characterized in that: The upper surface and the lower surface of the porous heat exchange plate are both provided with air holes.

8. The freeze-thaw method of the flexible and efficient freeze-thaw device according to any one of claims 1 to 7, characterized in that: When the items are packaged from frozen bottles (11), the frozen bottles (11) are placed on the porous heat exchange plate, and then the refrigerator (6) is started, and the circulation pump (5) is started at the same time to drive the gas to circulate. When the gas flows through the refrigerator (6), it becomes cold air. The cold air enters the cavity of the porous heat exchange plate through the medium distributor (4) and the distribution pipe (14), and then sprays out from each air hole to cool the frozen bottles (11). The gas in the freezing and thawing chamber (1) flows to the refrigerator (6) through the first circulation pipe (16) to realize circulation. When thawing, the refrigerator (6) is turned off and the heater (7) is turned on at the same time. When the items are packaged in a freezing box (12) with flat upper and lower surfaces, the freezing box (12) is placed on a non-porous heat exchange plate, and the distance between two adjacent non-porous heat exchange plates is adjusted so that the upper surface of the freezing box (12) fits the upper non-porous heat exchange plate; then the refrigerator (6) is started, and the circulation pump (5) is started at the same time to drive the heat exchange medium to circulate. When the heat exchange medium flows through the refrigerator (6), it becomes a cold medium. The cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor (4) and the distribution pipe (14), and cools the freezing box (12) by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the refrigerator (6) through the second circulation pipe (15) to achieve circulation; when thawing, the refrigerator (6) is turned off and the heater (7) is turned on at the same time.

9. The freeze-thaw method according to claim 8, characterized in that: When the items are packaged in a flexible bag (13), the bag (13) is first placed in a freezing box (12), and the non-porous heat exchange plate is installed at an angle. The freezing box (12) is then placed on the inclined non-porous heat exchange plate, and the distance between two adjacent non-porous heat exchange plates is adjusted so that the upper surface of the freezing box (12) fits the upper non-porous heat exchange plate. Then, the refrigerator (6) is started, and the circulation pump (5) is started at the same time to drive the heat exchange medium to circulate. When the heat exchange medium flows through the refrigerator (6), it becomes a cold medium. The cold medium enters the cavity of the non-porous heat exchange plate through the medium distributor (4) and the distribution pipe (14), and cools the freezing box (12) by heat exchange. The heat exchange medium in the non-porous heat exchange plate flows to the refrigerator (6) through the second circulation pipe (15) to achieve circulation. When thawing, the refrigerator (6) is turned off and the heater (7) is turned on at the same time.

10. The freeze-thaw method according to claim 8, characterized in that: When the height of the frozen bottle (11) is relatively large, a porous heat exchange plate having air holes on both the upper and lower surfaces is used, and cold air is ejected from the upper and lower surfaces of the porous heat exchange plate simultaneously to evenly cool the upper and lower parts of the frozen bottle (11); during the thawing process, the sample is oscillated by reciprocating motion of the mobile bracket (3) to accelerate the thawing process.

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