Low temperature processing system and method

Abstract

The present invention relates to the field of cryogenic treatment technology, and in particular to a cryogenic treatment system and method, wherein the cryogenic treatment system includes a cryogenic treatment device and a cold recovery device, wherein the first exhaust port of the cryogenic treatment device, the first air inlet of the cold recovery device, the second exhaust port of the cold recovery device and the second air inlet of the cryogenic treatment device are sequentially connected to form a first cold circulation loop; the third exhaust port of the cold recovery device, the third air inlet of the cryogenic treatment device, the fourth exhaust port of the cryogenic treatment device and the fourth air inlet of the cold recovery device are sequentially connected to form a second cold circulation loop; the cryogenic treatment device includes a cryogenic box and a refrigeration component, and the refrigeration component includes a heat exchanger and a refrigerator, the heat exchanger is arranged inside the cryogenic box, and the refrigerator is connected to the heat exchanger. The cryogenic treatment device and the cold recovery device are connected through a cold circulation pipeline to form a closed circulation system, so as to realize the full recovery of cold.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic treatment, and in particular to a cryogenic treatment system and method. Background Art

[0002] At present, cryogenic treatment technology (such as cold treatment of metal materials, low-temperature quick freezing of food, etc.) usually uses refrigerators as refrigerants to treat materials at low temperatures to improve the performance of materials (such as wear resistance and dimensional stability of metal materials, storage time of food). During the cryogenic treatment process, the working gas is usually discharged to the environment at a temperature not higher than the material treatment temperature, resulting in a large amount of cold loss.

[0003] In response to the above-mentioned problem of cold energy loss, the existing technology usually uses phase change materials to recover the cold energy of the discharged low-temperature nitrogen gas, and then uses heat exchange equipment to send the cold energy back to the low-temperature treatment device when needed, thereby reducing the energy consumption of the system. However, the actual exhaust temperature after passing through the cold energy recovery device is still lower than the room temperature, and it is difficult to recover the cold energy 100%. In addition, the cold energy recovery device is non-continuous. During the cold energy utilization process, the working gas passed into the cold energy recovery device needs to be dehumidified or additionally nitrogen needs to be used, which increases the difficulty and cost of operation. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a low temperature treatment system, in which a low temperature treatment device and a cold recovery device are connected through a cold circulation pipeline to form a closed circulation system, thereby realizing full recovery of cold.

[0005] The invention also provides a low temperature treatment method.

[0006] According to the first aspect of the present invention, the cryogenic treatment system includes a cryogenic treatment device and a cold energy recovery device, wherein the first exhaust port of the cryogenic treatment device, the first air inlet of the cold energy recovery device, the second exhaust port of the cold energy recovery device and the second air inlet of the cryogenic treatment device are connected in sequence to form a first cold energy circulation loop; the third exhaust port of the cold energy recovery device, the third air inlet of the cryogenic treatment device, the fourth exhaust port of the cryogenic treatment device and the fourth air inlet of the cold energy recovery device are connected in sequence to form a second cold energy circulation loop; the cryogenic treatment device includes a cryogenic box and a refrigeration component, and the refrigeration component includes a heat exchanger and a refrigerator, the heat exchanger is arranged inside the cryogenic box, and the refrigerator is connected to the heat exchanger.

[0007] According to one embodiment of the present invention, the first exhaust port and the third air inlet are both located at the top of the cryogenic box, the second air inlet and the fourth exhaust port are both located at the bottom of the cryogenic box, and the heat exchanger is located on one side of the cryogenic box close to the second air inlet.

[0008] According to one embodiment of the present invention, the cold recovery device includes a cold storage box and cold storage material filled in the cold storage box, the first air inlet and the third exhaust port are both located at the top of the cold storage box, and the second exhaust port and the fourth air inlet are both located at the bottom of the cold storage box.

[0009] According to one embodiment of the present invention, the refrigeration assembly further includes a fan, and the fan is arranged inside the cryogenic box and below the heat exchanger.

[0010] According to one embodiment of the present invention, a liquid inlet valve is provided on the liquid inlet pipeline connecting the refrigerator and the heat exchanger, and a liquid outlet valve is provided on the liquid outlet pipeline connecting the refrigerator and the heat exchanger.

[0011] According to one embodiment of the present invention, a first temperature detector is provided at the top of the deep cold box, and a second temperature detector is provided at the top and bottom of the cold storage box.

[0012] According to one embodiment of the present invention, a first exhaust valve is provided at the first exhaust port, a first intake valve is provided at the first intake port, a second exhaust valve is provided at the second exhaust port, and a second intake valve is provided at the second intake port.

[0013] According to one embodiment of the present invention, a third exhaust valve is provided at the third exhaust port, a third intake valve is provided at the third intake port, a fourth exhaust valve is provided at the fourth exhaust port, and a fourth intake valve is provided at the fourth intake port.

[0014] According to an embodiment of the present invention, a branch pipeline is provided on the pipeline communicating the second exhaust port with the second air inlet, and a pressure relief valve is provided on the branch pipeline.

[0015] According to a second aspect of the present invention, a low temperature treatment method using the above-mentioned low temperature treatment system is performed, comprising:

[0016] Initial cooling treatment:

[0017] The refrigeration component is turned on, the fan rotates forward, the second cooling circulation loop is closed, the connecting pipeline between the first exhaust port of the low-temperature treatment device of the first cooling circulation loop and the first air inlet of the cooling recovery device is opened, the connecting pipeline between the second exhaust port of the cooling recovery device and the second air inlet of the low-temperature treatment device is closed, and the branch pipeline connected to the second exhaust port is opened;

[0018] When the temperature of the middle part of the cold storage material in the cold recovery device is lower than the preset temperature, the branch pipe connected to the second exhaust port is closed, the refrigeration component is stopped, the fan is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed;

[0019] First cooling cycle treatment:

[0020] When the temperature of the top of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed;

[0021] Second cooling cycle treatment:

[0022] When the temperature at the bottom of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened;

[0023] The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

[0024] The above one or more technical solutions in the embodiments of the present invention have at least the following technical effects: the low-temperature treatment system in the embodiments of the present invention provides a low-temperature treatment system in which the cooling medium can be recycled, in order to solve the problems that the existing low-temperature treatment devices cannot completely recover the cooling medium's cold, and the operation is difficult and the cost is high during the cold recovery process. The low-temperature treatment device and the cold recovery device are connected through a cold circulation pipeline to form a closed circulation system to achieve full recovery of cold. Two sets of air inlets and two sets of exhaust ports are respectively provided on the low-temperature treatment device and the cold recovery device to form two independent first cold circulation loops and second cold circulation loops, respectively, and the flow direction of the cooling medium in the first cold circulation loop is opposite to that in the second cold circulation loop. The first cold circulation loop allows the material to be cooled to exchange heat with the material in the low-temperature treatment device, that is, the heat exchanger fully exchanges heat between the cold of the refrigerator and the cooling medium, and the cooling medium cools down the material to be cooled in the deep cold box, and then the low-temperature cooling medium enters the cold recovery device, obtains full recovery of cold in the cold recovery device and discharges the cooling medium, or returns to the low-temperature treatment device after heat exchange and cooling in the cold recovery device; the second cold circulation loop allows the cooling medium in the low-temperature treatment device to enter the cold recovery device, and exchanges heat with the recovered cold in the cold recovery device to cool down, and then returns to the low-temperature treatment device to exchange heat with the material to be cooled, which greatly reduces the consumption of cooling medium.

[0025] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic structural diagram of a low temperature processing system according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1: low temperature treatment device; 11: deep cold box; 12: refrigeration component; 111: first temperature detector; 121: fan; 122: heat exchanger; 123: refrigerator; 124: liquid inlet valve; 125: motor; 126: liquid outlet valve;

[0030] 2: cold recovery device; 21: cold storage box; 22: cold storage material; 211: second temperature detector;

[0031] 31: Materials to be cooled;

[0032] 41: first exhaust valve; 42: second exhaust valve; 43: third exhaust valve; 44: fourth exhaust valve;

[0033] 51: first air intake valve; 52: second air intake valve; 53: third air intake valve; 54: fourth air intake valve;

[0034] 61: first pipeline; 62: second pipeline; 63: third pipeline; 64: fourth pipeline;

[0035] 7: branch line; 71: pressure relief valve. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance, nor can they be understood as representing any order or number of times.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0039] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] like Figure 1As shown, the cryogenic treatment system provided by the embodiment of the present invention includes a cryogenic treatment device 1 and a cold energy recovery device 2, the first exhaust port of the cryogenic treatment device 1, the first air inlet of the cold energy recovery device 2, the second exhaust port of the cold energy recovery device 2 and the second air inlet of the cryogenic treatment device 1 are connected in sequence to form a first cold energy circulation loop; the third exhaust port of the cold energy recovery device 2, the third air inlet of the cryogenic treatment device 1, the fourth exhaust port of the cryogenic treatment device 1 and the fourth air inlet of the cold energy recovery device 2 are connected in sequence to form a second cold energy circulation loop; the cryogenic treatment device 1 includes a cryogenic box 11 and a refrigeration component 12, the refrigeration component 12 includes a heat exchanger 122 and a refrigerator 123, the heat exchanger 122 is arranged inside the cryogenic box 11, and the refrigerator 123 is connected to the heat exchanger 122.

[0042] The cryogenic treatment system of the embodiment of the present invention provides a cryogenic treatment system that can recycle the cold of the cooling medium to address the problems that the existing cryogenic treatment devices cannot completely recover the cold of the cooling medium, and the operation is difficult and costly during the cold recovery process. The cryogenic treatment device 1 and the cold recovery device 2 are connected through a cold circulation pipeline to form a closed circulation system to achieve full recovery of cold. Two sets of air inlets and two sets of exhaust ports are respectively provided on the cryogenic treatment device 1 and the cold recovery device 2 to form two independent first cold circulation loops and second cold circulation loops, respectively, and the flow direction of the cooling medium in the first cold circulation loop is opposite to that in the second cold circulation loop. The first cold circulation loop allows the material to be cooled 31 to exchange heat with the low-temperature treatment device 1, that is, the heat exchanger 122 fully exchanges the cold of the refrigerator 123 with the cooling medium, and the cooling medium cools down the material to be cooled 31 in the deep cold box 11, and then the low-temperature cooling medium enters the cold recovery device 2, obtains full recovery of cold in the cold recovery device 2 and discharges the cooling medium, or returns to the low-temperature treatment device 1 after heat exchange and cooling in the cold recovery device 2; the second cold circulation loop allows the cooling medium in the low-temperature treatment device 1 to enter the cold recovery device 2, and exchanges heat with the recovered cold in the cold recovery device 2 to cool down, and then returns to the low-temperature treatment device 1 again to exchange heat with the material to be cooled 31, which greatly reduces the consumption of cooling medium.

[0043] According to one embodiment of the present invention, the first exhaust port and the third air inlet are both located at the top of the cryogenic box 11, the second air inlet and the fourth exhaust port are both located at the bottom of the cryogenic box 11, and the heat exchanger 122 is disposed on one side of the cryogenic box 11 near the second air inlet. The cold recovery device 2 includes a cold storage box 21 and a cold storage material 22 filled in the cold storage box 21, the first air inlet and the third exhaust port are both located at the top of the cold storage box 21, and the second exhaust port and the fourth air inlet are both located at the bottom of the cold storage box 21.

[0044] In this embodiment, the deep cold box 11 is vertically arranged, and the flow direction of the cooling medium inside it is from top to bottom or from bottom to top. The refrigerator 123 and the heat exchanger 122 of the refrigeration assembly 12 provide cold for the cooling medium circulating in the entire system. The cold storage box 21 is also vertically arranged, and the cold storage material 22 is filled inside it. The cooling medium exchanges heat with the cold storage material 22 and enters and exits the top or bottom of the cold storage box 21.

[0045] In the first cooling circulation loop, after the cooling medium exchanges heat with the material to be cooled 31, it is discharged from the first exhaust port on the top of the cryogenic box 11, passes through the first pipeline 61, and enters the cold storage box 21 through the first air inlet on the top of the cold storage box 21. After heat exchange with the cold storage material 22, the cooling medium is discharged from the second exhaust port at the bottom of the cold storage box 21, passes through the second pipeline 62, and enters the cold storage box 11 through the second air inlet at the bottom of the cold storage box 11, and exchanges heat with the material to be cooled 31.

[0046] In the second cooling circulation loop, the cooling medium is discharged from the fourth exhaust port at the bottom of the cryogenic box 11, passes through the third pipeline 63, and enters the cold storage box 21 through the fourth air inlet at the bottom of the cold storage box 21. After heat exchange with the cold storage material 22, the cooling medium is discharged from the third exhaust port at the top of the cold storage box 21, passes through the fourth pipeline 64, and enters the cryogenic box 11 through the third air inlet at the top of the cryogenic box 11, and exchanges heat with the material 31 to be cooled.

[0047] In this embodiment, the cold storage box 21 is an external cavity with a heat-insulating material, and the heat-insulating material is selected from polyurethane foam material, etc. The cold storage material 22 is a solid cold storage material or a phase-change cold storage material for recovering the cold of the low-temperature cooling medium. The cold storage material 22 can be selected from a low-temperature solid cold storage material such as a wire mesh or particles made of stone, stainless steel, copper, etc., or a phase-change cold storage material such as carbon dioxide, ammonia, etc.

[0048] According to one embodiment of the present invention, the refrigeration assembly 12 further includes a fan 121, a refrigerator 123 connected to a heat exchanger 122, and the fan 121 is arranged inside the cryogenic box 11 and below the heat exchanger 122. In this embodiment, the cooling medium is provided by the cooling medium, the fan 121 is located at the bottom inside the cryogenic box 11, and the heat exchanger 122 is installed above the fan 121. The refrigerator 123 is connected to the heat exchanger 122 through a refrigerant delivery pipeline, so that the cooling medium (such as air or cooling medium) in the cryogenic box 11 exchanges heat with the refrigerant from bottom to top through the heat exchanger 122 under the action of the fan 121, and the low-temperature cooling medium is controlled by the fan 121. When the fan 121 rotates forward, the low-temperature cooling medium flows in the first cold circulation loop, and when the fan 121 rotates reversely, the low-temperature cooling medium flows in the second cold circulation loop.

[0049] According to one embodiment of the present invention, a liquid inlet valve 124 is provided on the liquid inlet pipeline connecting the refrigerator 123 and the heat exchanger 122, and a liquid outlet valve 126 is provided on the liquid outlet pipeline connecting the refrigerator 123 and the heat exchanger 122. In this embodiment, a liquid inlet valve 124 and a liquid outlet valve 126 are provided on the liquid inlet and liquid storage refrigerant delivery pipelines connecting the refrigerator 123 and the heat exchanger 122, respectively, so as to control the time and flow rate of the cooling medium input. The fan 121 is connected through an external motor 125, so as to control the start, stop and direction of the fan 121.

[0050] In this embodiment, the cooling medium can be air or nitrogen, or other low-temperature liquids such as liquid alcohol. In the process of cold recovery and utilization, by using the low-temperature nitrogen inside the system as the working medium, the dehumidification operation involved in the existing equipment that needs to absorb external air as the working medium, or the high cost problem involved in the existing equipment that needs to introduce additional dry nitrogen as the working medium is avoided.

[0051] In this embodiment, the heat exchanger 122 is a plate-like structure, which divides the internal space of the cryogenic box 11 into two parts from top to bottom. The upper space is used to fill the material to be cooled 31, and the lower space is provided with a fan 121. After the heat exchanger 122 exchanges heat between the cooling medium and the refrigerant, since the fan 121 is below the heat exchanger 122, the cooling medium can flow upward and evenly contact the material to be cooled 31 in the upper space after the fan 121 rotates. After the heat exchange, the cooling medium absorbs heat and vaporizes to form a low-temperature cooling medium. Under the action of the fan 121, it continues to move upward and enters the first exhaust port, or the cooling medium entering the cryogenic box 11 from the third air inlet contacts the material to be cooled 31. After the heat exchange, the cooling medium is discharged from the fourth exhaust port to the cold recovery device 2 under the action of the fan 121.

[0052] According to one embodiment of the present invention, a first temperature detector 111 is provided at the top of the deep cold box 11, and a second temperature detector 211 is provided at the top and bottom of the cold storage box 21. In this embodiment, a first temperature detector 111 is arranged in the deep cold box 11 for detecting the real-time temperature inside the deep cold box 11, and a second temperature detector 211 is arranged near the top and bottom of the cold storage box 21 for detecting the real-time temperature inside the cold storage box 21. The direction of the cooling medium circulation can be controlled by the relationship between the detected temperatures of the first temperature detector 111 and the second temperature detector 211. In this embodiment, both the first temperature detector 111 and the second temperature detector 211 are thermometers.

[0053] According to one embodiment of the present invention, a first exhaust valve 41 is provided at the first exhaust port, a first intake valve 51 is provided at the first intake port, a second exhaust valve 42 is provided at the second exhaust port, and a second intake valve 52 is provided at the second intake port. A third exhaust valve 43 is provided at the third exhaust port, a third intake valve 53 is provided at the third intake port, a fourth exhaust valve 44 is provided at the fourth exhaust port, and a fourth intake valve 54 is provided at the fourth intake port.

[0054] In this embodiment, the cold circulation pipeline includes a first pipeline 61, a second pipeline 62, a third pipeline 63 and a fourth pipeline 64 connecting the deep cold box 11 and the cold storage box 21, all of which are arranged outside the deep cold box 11 and the cold storage box 21, and each is equipped with a switch valve, that is, the first pipeline 61 connecting the first exhaust port and the first air inlet is correspondingly provided with a first exhaust valve 41 and a first air inlet valve 51, the second pipeline 62 connecting the second exhaust port and the second air inlet is correspondingly provided with a second exhaust valve 42 and a second air inlet valve 52, the third pipeline 63 connecting the fourth exhaust port and the fourth air inlet is correspondingly provided with a fourth exhaust valve 44 and a fourth air inlet valve 54, and the fourth pipeline 64 connecting the third exhaust port and the third air inlet is correspondingly provided with a third exhaust valve 43 and a third air inlet valve 53.

[0055] When the first cooling circulation loop is opened, the first exhaust valve 41, the first air intake valve 51, the second exhaust valve 42 and the second air intake valve 52 are opened; when the first cooling circulation loop is closed, these four valves are also closed accordingly; when the second cooling circulation loop is opened, the third exhaust valve 43, the third air intake valve 53, the fourth exhaust valve 44 and the fourth air intake valve 54 are opened; when the second cooling circulation loop is closed, these four valves are also closed accordingly.

[0056] Each cooling circulation pipeline is wrapped with insulation material to reduce cooling loss. When the first cooling circulation loop or the second cooling circulation loop is operated, the relevant air inlet valve or exhaust valve control can be manually controlled or automatically controlled, so as to circulate and recycle the cooling capacity of the low-temperature cooling medium.

[0057] According to one embodiment of the present invention, a branch line 7 is provided on the pipeline connecting the second exhaust port and the second air inlet, and a pressure relief valve 71 is provided on the branch line 7. In this embodiment, during the initial cooling process, the refrigeration component 12 is turned on, and the refrigerant exchanges heat with the cooling medium through the heat exchanger 122. After the cooling medium exchanges heat with the material to be cooled 31, it enters the cold storage box 21 through the deep cold box 11 through the first pipeline 61, and the cold is stored in the cold storage material 22, and then discharged through the pressure relief valve 71 of the branch line 7 connected to the second exhaust port at the bottom of the cold storage box 21, so as to recover the cold of the cooling medium in the cold recovery device 2. That is, the first exhaust valve 41, the first air inlet valve 51, the second exhaust valve 42 and the pressure relief valve 71 are opened, and the second air inlet valve 52, the third exhaust valve 43, the third air inlet valve 53, the fourth exhaust valve 44 and the fourth air inlet valve 54 are all closed.

[0058] The embodiment of the present invention further provides a low temperature processing method using the low temperature processing system of the above embodiment, including:

[0059] Initial cooling treatment:

[0060] The refrigeration assembly 12 is turned on, the fan 121 rotates forward, the second cold circulation loop is closed, the connecting pipeline between the first exhaust port of the low temperature treatment device 1 and the first air inlet of the cold recovery device 2 of the first cold circulation loop is opened, the connecting pipeline between the second exhaust port of the cold recovery device 2 and the second air inlet of the low temperature treatment device 1 is closed, and the branch pipeline 7 connected to the second exhaust port is opened;

[0061] When the temperature of the middle part of the cold storage material 22 in the cold recovery device 2 is lower than the preset temperature, the branch pipe 7 connected to the second exhaust port is closed, the refrigeration component 12 is stopped, the fan 121 is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed;

[0062] First cooling cycle treatment:

[0063] When the temperature of the top of the cold storage material 22 in the cold recovery device 2 is higher than the temperature in the low temperature treatment device 1, the fan 121 rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed;

[0064] Second cooling cycle treatment:

[0065] When the temperature at the bottom of the cold storage material 22 in the cold recovery device 2 is higher than the temperature in the low temperature treatment device 1, the fan 121 is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened;

[0066] The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

[0067] S1, secondary cooling treatment:

[0068] The refrigerant input by the refrigerator 123 exchanges heat with the cooling medium through the heat exchanger 122, so that the cooling medium is cooled. The fan 121 rotates in a clockwise direction, and blows the cooling medium from the bottom to the top of the deep cold box 11 to the material to be cooled 31, and exchanges heat with the material to be cooled 31. After the cooling medium absorbs the heat of the material to be cooled 31, it enters the cold storage box 21 through the first pipeline to exchange heat with the cold storage material 22. The cooling medium stores the cold in the cold storage material 22, and its own temperature gradually increases. After reaching the preset temperature, it is discharged through the pressure relief valve 71 installed at the bottom of the cold storage box 21; at the same time, the temperature of the upper part of the cold storage material 22 gradually decreases, and the temperature is gradually increased from top to bottom, that is, the cold is mainly stored in the upper half of the cold storage material 22. In this embodiment, the preset temperature is room temperature.

[0069] When the temperature in the middle of the cold storage material 22 is lower than the room temperature, the pressure relief valve 71 at the bottom of the cold storage box 21 is closed, the refrigerant delivery of the refrigerator 123 is stopped, the heat exchanger 122 stops exchanging heat, and the direction of the fan 121 is changed to rotate in the counterclockwise direction. The cooling medium flowing out from the bottom of the deep cold box 11 enters the cold storage box 21 through the third pipeline 63, and then passes through the cold storage material 22 from bottom to top for heat exchange. The cooling medium is gradually heated by the cold storage material 22 with a high temperature in the lower part, and the temperature gradually increases. The temperature in the middle position returns to a high temperature, while the temperature of the cold storage material 22 at a high temperature in the lower part gradually decreases. After returning to high temperature, the cooling medium further exchanges heat with the low-temperature cold storage material 22 in the upper part, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the upper part gradually increases. After the cooling medium drops to the lowest temperature at the top of the cold storage material 22, it enters the deep cold box 11 through the fourth pipeline 64 to cool the material 31 to be cooled, and then enters the bottom of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0070] S2, first cooling cycle processing:

[0071] When the temperature at the top of the cold storage material 22 in the cold storage box 21 is higher than the temperature in the deep cold box 11, the direction of the fan 121 is changed to rotate in the clockwise direction. The cooling medium flowing out from the top of the deep cold box 11 enters the cold storage box 21 through the first pipeline 61, and then exchanges heat through the cold storage material 22 from top to bottom. The low-temperature cooling medium is gradually heated by the high-temperature cold storage material 22 in the upper part, and the temperature gradually increases. The temperature in the middle position returns to near room temperature, while the temperature of the high-temperature cold storage material 22 in the upper part gradually decreases. The cooling medium that has returned to high temperature further exchanges heat with the low-temperature cold storage material 22 in the lower part, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the lower part gradually increases. After the cooling medium drops to the lowest temperature at the bottom of the cold storage material 22, it enters the deep cold box 11 through the second pipeline 62 to cool the material 31 to be treated, and then enters the bottom of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0072] S3, second cooling cycle processing:

[0073] When the temperature at the bottom of the cold storage material 22 in the cold storage box 21 is higher than the temperature in the deep cold box 11, the direction of the fan 121 is changed to rotate in the counterclockwise direction. The low-temperature cooling medium flowing out from the bottom of the deep cold box 11 enters the cold storage box 21 through the third pipeline 63, and then exchanges heat through the cold storage material 22 from bottom to top. The low-temperature cooling medium is gradually heated by the cold storage material 22 with high temperature in the lower half, and the temperature gradually increases. The temperature reaches the highest state in the middle position, while the temperature of the cold storage material 22 at the lower half gradually decreases. The cooling medium after returning to high temperature further exchanges heat with the low-temperature cold storage material 22 in the upper half, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the upper half gradually increases. After the cooling medium drops to the lowest temperature at the top of the cold storage material 22, it enters the deep cold box 11 through the fourth pipeline 64, cools the material 31 to be treated with cold, and then enters the bottom of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0074] S4, step S2 and step S3 are continuously cycled, and the supply of cooling medium is stopped during these two cycles. The switching of each exhaust valve and intake valve is an automatic process, and the controller automatically switches according to the temperature in the deep cold box 11 measured by the first temperature detector 111 and the temperature relationship between the top and bottom of the cold storage material 22 measured by the second temperature detector 211.

[0075] After the material in the cryogenic box 11 is processed, it is sent out of the box through the automatic conveying device, and new materials are automatically added to the cryogenic box 11. During the entire automatic replacement and transmission process of the cold-treated material, the cryogenic box 11 remains closed throughout the process, and only the inlet and outlet of the material to be cold-treated 31 are left on the side of the cryogenic box 11 and insulation measures are taken, so there is almost no leakage of cold. At the same time, the automatic transmission and replacement process of the material does not interfere with the recovery and utilization process of the cold.

[0076] Considering that the low temperature system inevitably has heat leakage, after a long period of operation, if the low temperature cooling medium coming out of the cold recovery device 2 does not reach the preset temperature, a certain amount of cooling medium will be added to the system to obtain a lower temperature. The cold of the low temperature cooling medium is continuously stored and utilized through the first cold cycle or the second cold cycle, which reduces the problem that the cold of the single-direction cold recovery device cannot be fully recovered, and the complex and high-cost operation during the recovery process.

[0077] When in use, the valve is not limited to be a stop valve, an electric valve, a solenoid valve or other types of valves that can be turned on and off.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low temperature processing system, Features: The invention comprises a cryogenic treatment device and a cold recovery device, wherein a first exhaust port of the cryogenic treatment device, a first air inlet of the cold recovery device, a second exhaust port of the cold recovery device and a second air inlet of the cryogenic treatment device are connected in sequence to form a first cold circulation loop; a third exhaust port of the cold recovery device, a third air inlet of the cryogenic treatment device, a fourth exhaust port of the cryogenic treatment device and a fourth air inlet of the cold recovery device are connected in sequence to form a second cold circulation loop; the cryogenic treatment device comprises a deep cold box and a refrigeration component, wherein the refrigeration component comprises a heat exchanger and a control system. The heat exchanger is arranged inside the cryogenic box, and the refrigerator is connected to the heat exchanger; the first exhaust port and the third air inlet are both located at the top of the cryogenic box, the second air inlet and the fourth exhaust port are both located at the bottom of the cryogenic box, and the heat exchanger is located on the side of the cryogenic box close to the second air inlet; the cold recovery device includes a cold storage box and cold storage material filled in the cold storage box, the first air inlet and the third exhaust port are both located at the top of the cold storage box, and the second exhaust port and the fourth air inlet are both located at the bottom of the cold storage box.

2. The cryogenic treatment system according to claim 1, Features: The refrigeration assembly also includes a fan, which is arranged inside the cryogenic box and below the heat exchanger.

3. The cryogenic treatment system according to claim 1, Features: A liquid inlet valve is provided on the liquid inlet pipeline communicating with the refrigerator and the heat exchanger, and a liquid outlet valve is provided on the liquid outlet pipeline communicating with the refrigerator and the heat exchanger.

4. The cryogenic treatment system according to claim 1, Features: A first temperature detector is provided at the top of the deep cold box, and a second temperature detector is provided at the top and bottom of the cold storage box.

5. The cryogenic treatment system according to any one of claims 1 to 4, Features: A first exhaust valve is provided at the first exhaust port, a first intake valve is provided at the first intake port, a second exhaust valve is provided at the second exhaust port, and a second intake valve is provided at the second intake port.

6. The cryogenic treatment system according to claim 5, Features: The third exhaust port is provided with a third exhaust valve, the third air inlet is provided with a third air inlet valve, the fourth exhaust port is provided with a fourth exhaust valve, and the fourth air inlet is provided with a fourth air inlet valve.

7. The cryogenic processing system according to claim 5, Features: A branch pipeline is provided on the pipeline communicating the second exhaust port and the second air inlet, and a pressure relief valve is provided on the branch pipeline.

8. A low temperature treatment method using the low temperature treatment system according to any one of claims 1 to 7, Features: include: Initial cooling treatment: The refrigeration component is turned on, the fan rotates forward, the second cooling circulation loop is closed, the connecting pipeline between the first exhaust port of the low-temperature treatment device of the first cooling circulation loop and the first air inlet of the cooling recovery device is opened, the connecting pipeline between the second exhaust port of the cooling recovery device and the second air inlet of the low-temperature treatment device is closed, and the branch pipeline connected to the second exhaust port is opened; When the temperature of the middle part of the cold storage material in the cold recovery device is lower than the preset temperature, the branch pipe connected to the second exhaust port is closed, the refrigeration component is stopped, the fan is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed; First cooling cycle treatment: When the temperature of the top of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed; Second cooling cycle treatment: When the temperature at the bottom of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened; The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

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