Ultralow-temperature refrigerating system and ultralow-temperature equipment

Abstract

The ultralow-temperature refrigerating system comprises a first-stage refrigerating system, a second-stage refrigerating system and an evaporative condenser, and the first-stage refrigerating system, the second-stage refrigerating system and the evaporative condenser form a cascade system. The first-stage refrigerating system comprises a first compressor, a first heat exchanger, a second heat exchanger and a first throttling assembly. An outlet of the first compressor communicates with the first heat exchanger and the second heat exchanger through a reversing valve, the second heat exchanger communicates with the second heat exchanger and the evaporative condenser through a first throttling assembly, and the evaporative condenser communicates with an inlet of the first compressor. The second heat exchanger is communicated with an inlet of the first compressor through a reversing valve, and the second heat exchanger is adjacent to a second evaporator of the second-stage refrigerating system. When the ultralow-temperature refrigerating system is used for defrosting, only the primary refrigerating system needs to be started, and the primary refrigerating system and the secondary refrigerating system do not need to be started at the same time, so that the load of the ultralow-temperature refrigerating system during defrosting is reduced, and the energy consumption is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of refrigeration technology, especially to a super low temperature refrigeration system and super low temperature equipment. BACKGROUND

[0002] The super low temperature refrigerator is a refrigeration equipment which can control the temperature in a low temperature range, the temperature range is from minus 15 DEG C to minus 190 DEG C, and is widely used in the biological engineering, epidemic prevention, pharmaceutical and other industries.

[0003] At present, the super low temperature refrigerator in the domestic generally adopts the cascade refrigeration system, the cascade refrigeration system includes high temperature level refrigeration system and low temperature level refrigeration system, the high temperature level refrigeration system adopts the refrigerant suitable for the operation in the medium temperature range, such as R404A or R290 etc.;And the low temperature level refrigeration system adopts the refrigerant capable of working at extremely low temperature, such as R23, R508 etc. In the refrigeration process of the super low temperature refrigerator, the compressors of the two refrigeration systems are operated simultaneously, and the refrigerants of two different temperature levels exchange heat in the evaporative condenser, the high temperature level refrigerant evaporates here and takes away the heat;And the low temperature level refrigerant condenses here and freezes the super low temperature refrigerator.

[0004] And the super low temperature refrigerator generally adopts the direct cooling mode to reduce temperature, so after the super low temperature refrigerator works for a period of time, the inner wall of the super low temperature refrigerator will produce frost, and then the refrigeration effect is poor, and the energy consumption is also increased accordingly, since the storage environment temperature of the super low temperature refrigerator is extremely strict, therefore the frost will affect the normal use of the super low temperature refrigerator. At the same time, with the long-term use of the super low temperature refrigerator, the super low temperature refrigerator will inevitably produce the dirty blockage phenomenon, that is, the refrigeration pipeline in the super low temperature refrigerator is blocked by dust and impurities, which affects the normal circulation of the refrigerant, and seriously affects the reliability of the super low temperature refrigerator.

[0005] Therefore, the super low temperature refrigerator needs to be defrosted, and the existing defrosting methods include the following:

[0006] 1, the power of the super low temperature refrigerator is cut off to carry out natural defrosting or manual defrosting, but the defrosting method takes a long time, is not conducive to the preservation of stored goods, and consumes more manpower and is not convenient.

[0007] 2, the low temperature level refrigerant flows through the low temperature level evaporator in the low temperature level refrigeration system by the low temperature level compressor of the low temperature level refrigeration system to utilize the heat of the low temperature level refrigerant to defrost. But this defrosting method needs to start the high and low temperature level refrigeration systems simultaneously, and at the same time, the temperature in the compartment is low, and the load of the whole system is also large, resulting in high energy consumption. INVENTION CONTENTS

[0008] The utility model provides a super low temperature refrigeration system and super low temperature equipment for solving the problem of high energy consumption of the defrosting of the super low temperature refrigeration system in the prior art.

[0009] The technical scheme of the utility model discloses a kind of ultra-low temperature refrigeration systems, including primary refrigeration system, secondary refrigeration system and evaporative condenser, and constitute cascade system;The primary refrigeration system includes first compressor, first heat exchanger, second heat exchanger and first throttling component;

[0010] The outlet of the first compressor is communicated with the first heat exchanger and the second heat exchanger respectively through the reversing valve, the second heat exchanger is communicated with the second heat exchanger and the evaporative condenser respectively through the first throttling component, and the evaporative condenser is also communicated with the inlet of the first compressor;

[0011] The second heat exchanger is communicated with the inlet of the first compressor through the reversing valve, and the second heat exchanger is arranged adjacent to the second evaporator of the secondary refrigeration system.

[0012] Among them, first refrigerant is sequentially circulated in the first compressor, first heat exchanger, first throttling component and second heat exchanger through the reversing valve.

[0013] Further, a first valve is arranged between the first throttling component and the second heat exchanger, and the first valve is used to block the flow of the first refrigerant between the first throttling component and the second heat exchanger.

[0014] Further, a second valve is arranged between the first throttling component and the evaporative condenser, and the second valve is used to block the flow of the first refrigerant between the first throttling component and the evaporative condenser.

[0015] The utility model also proposes a kind of ultra-low temperature equipment, and the ultra-low temperature equipment includes the ultra-low temperature refrigeration system described above.

[0016] Further, the ultra-low temperature equipment includes a water pan structure, and the water pan structure is used to collect defrosting water generated by defrosting of the ultra-low temperature equipment.

[0017] Further, the water pan structure includes a water collecting tank and a water pan.

[0018] A water collecting tank is arranged at the bottom of the second evaporator of the secondary refrigeration system, and the lowest point in the water collecting tank is communicated with the water pan through a water collecting pipeline.

[0019] A third valve is arranged in the water collecting pipeline.

[0020] Further, a liquid level sensor is arranged in the water pan, and the liquid level sensor is used to detect the liquid level of defrosting water in the water pan.

[0021] Further, the bottom of the water pan is provided with at least one fluid channel, which is used for flowing the defrosting water to the first heat exchanger.

[0022] Further, the ultra-low temperature device is internally provided with a condensing fan matched with the first heat exchanger, which is used for accelerating the evaporation of the defrosting water to the first heat exchanger.

[0023] Further, the ultra-low temperature device comprises a spraying structure, which is used for spraying the pipeline assembly inside the ultra-low temperature device.

[0024] Further, the spraying structure comprises a water pump, a spraying pipeline and a spraying head.

[0025] The water pump is located in the water pan structure and is used for pumping the defrosting water collected by the water pan structure; the water pump is communicated with the spraying head through the spraying pipeline, and the spraying head is used for spraying the pipeline assembly inside the ultra-low temperature device.

[0026] The fourth valve is arranged in the spraying pipeline.

[0027] Compared with the prior art, the utility model has at least the following beneficial effects:

[0028] The ultra-low temperature refrigerating system provided by the utility model only needs to start the primary refrigerating system when defrosting, at this time, the first refrigerant flows in the first compressor, the second heat exchanger, the first throttling assembly and the first heat exchanger in sequence to defrost the first heat exchanger; meanwhile, because the second heat exchanger is arranged adjacent to the second evaporator, the heat generated by the second heat exchanger can also be transmitted to the second evaporator to defrost the second evaporator, so the primary refrigerating system and the secondary refrigerating system do not need to be started at the same time, thereby reducing the load of the ultra-low temperature refrigerating system when defrosting and further reducing the energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the utility model; the terms "include" and "have" and any variations thereof in the specification and claims of the utility model and the above description of drawings are intended to cover the non-exclusive inclusion; the terms "first", "second" and the like in the specification and claims of the utility model or the above description of drawings are used to distinguish different objects and are not used to describe a specific order.

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the cryogenic refrigeration system proposed in this utility model in startup mode;

[0032] Figure 2 This is a schematic diagram of the cryogenic refrigeration system proposed in this utility model in refrigeration mode;

[0033] Figure 3 This is a schematic diagram of the ultra-low temperature refrigeration system proposed in this utility model in defrost mode;

[0034] Figure 4 The flowchart is as follows: The ultra-low temperature refrigeration system proposed in this utility model;

[0035] Figure 5 This is a schematic diagram of the internal structure of the cryogenic device proposed in this utility model;

[0036] Figure 6 for Figure 5 An enlarged schematic diagram of reference numeral A in the attached figure;

[0037] Figure 7 for Figure 5 An enlarged schematic diagram of reference numeral B in the attached figure.

[0038] Figure label:

[0039] 10. Primary refrigeration system; 101. First compressor; 102. First heat exchanger; 103. Second heat exchanger; 104. First throttling assembly; 105. Reversing valve; 106. First valve; 107. Second valve;

[0040] 20. Secondary refrigeration system; 201. Second evaporator; 202. Second compressor; 203. Second throttling assembly;

[0041] 30. Evaporator-condenser;

[0042] 40. Water receiving tray structure; 401. Water receiving trough; 402. Water receiving tray; 403. Water receiving pipe; 404. Third valve; 405. Fluid passage;

[0043] 50. Liquid level sensor;

[0044] 60. Condensing fan;

[0045] 70, spray structure; 701, water pump; 702, spray pipeline; 703, spray head; 704, fourth valve;

[0046] 80, clean the fan. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. Therefore, the features described in the specification are used to explain one of the features of one embodiment of the present application, but not to imply that each embodiment of the present application must have the features described. In addition, it should be noted that the specification describes many features. Although some features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0048] The principles and structures of the present application are described in detail below in combination with the drawings and examples.

[0049] Example 1

[0050] The defrosting method of the prior art ultra-low temperature refrigerator includes the following methods:

[0051] 1. Turn off the power of the ultra-low temperature refrigerator for natural defrosting or manual defrosting, but this defrosting method takes a long time, is not conducive to the preservation of stored goods, and consumes a lot of manpower and is not convenient.

[0052] 2. The low-temperature level refrigerant flows through the low-temperature level evaporator in the low-temperature level compressor in the low-temperature level refrigeration system to utilize the heat of the low-temperature level refrigerant for defrosting. However, this defrosting method requires simultaneous opening of the high and low temperature level refrigeration systems, and due to the low temperature in the compartment, the load on the entire system is also large, resulting in high energy consumption.

[0053] Therefore, with reference to the accompanying drawings, Figures 1-3 The present application provides an ultra-low temperature refrigeration system with low energy consumption during defrosting, comprising a primary refrigeration system 10 and a secondary refrigeration system 20, and the primary refrigeration system 10 and the secondary refrigeration system 20 form a cascade system through an evaporative condenser 30; the primary refrigeration system 10 comprises a first compressor 101, a first heat exchanger 102, a second heat exchanger 103 and a first throttling assembly 104;

[0054] The outlet of the first compressor 101 can be communicated with the first heat exchanger 102 and the second heat exchanger 103 through a reversing valve 105, the second heat exchanger 103 is communicated with the second heat exchanger 103 and the evaporative condenser 30 through the first throttling assembly 104, and the evaporative condenser 30 is also communicated with the inlet of the first compressor 101;

[0055] The second heat exchanger 103 can be communicated with the inlet of the first compressor 101 through the reversing valve 105, and the second heat exchanger 103 is arranged adjacent to the second evaporator 201 of the secondary refrigeration system 20.

[0056] The first refrigerant flows in the first compressor 101, the first heat exchanger 102, the first throttling assembly 104 and the second heat exchanger 103 in sequence through the reversing valve 105.

[0057] It should be noted that the ultra-low temperature refrigeration system also comprises a main control unit (not shown, the same below), which is electrically connected with the first compressor 101 and the second compressor 202. The secondary refrigeration system 20 comprises a second evaporator 201, a second compressor 202 and a second throttling assembly 203.

[0058] The outlet of the second compressor 202 is communicated with the second inlet of the evaporative condenser 30, the second outlet of the evaporative condenser 30 is communicated with the inlet of the second evaporator 201 through the second throttling assembly 203, and the outlet of the second evaporator 201 is communicated with the inlet of the second compressor 202.

[0059] The outlet of the first compressor 101 can be communicated with the first heat exchanger 102 and the second heat exchanger 103 through a reversing valve 105, the second heat exchanger 103 is communicated with the second heat exchanger 103 and the evaporative condenser 30 through the first throttling assembly 104, and the evaporative condenser 30 is also communicated with the inlet of the first compressor 101;

[0060] The reversing valve 105 is preferably a four-way reversing valve. The first refrigerant suitable for medium temperature range operation, such as R404A or R290, is used in the primary refrigeration system 10, and the second refrigerant capable of working at extremely low temperature, such as R23 or R508, is used in the secondary refrigeration system 20. The first throttling assembly 104 and the second throttling assembly 203 are both preferably capillary tubes. The capillary tube is used to control the flow of refrigerant passing through itself, and the small inner diameter of the capillary tube limits the flow of refrigerant, so that the liquid refrigerant on the high pressure side can rapidly expand and reduce the pressure when passing through the capillary tube, which results in a sharp drop in temperature, which prepares for the subsequent evaporation process.

[0061] Wherein, the ultra-low temperature refrigeration system has the following three cases, the refrigerant circulation flow direction in each mode is different, specifically:

[0062] I. When the ultra-low temperature refrigeration system is powered on and enters the starting mode, the main control unit starts the primary refrigeration system 10, controls the switching of the reversing valve 105, so that the outlet of the first compressor 101 communicates with the first heat exchanger 102, and the second heat exchanger 103 communicates with the inlet of the first compressor 101, at this time the first refrigerant circulates in the first compressor 101, the first heat exchanger 102, the first throttling component 104 and the second heat exchanger 103 in turn, to carry out primary refrigeration; Wherein, the first heat exchanger 102 at this time is equivalent to a condenser, and the second heat exchanger 103 is equivalent to an evaporator.

[0063] II. When the ultra-low temperature refrigeration system carries out primary refrigeration through the primary refrigeration system 10, and the corresponding temperature is reduced to the preset refrigeration temperature, at this time the main control unit starts the secondary refrigeration system 20, so that the ultra-low temperature refrigeration system switches from the starting mode to the refrigeration mode, at this time the first refrigerant circulates in the first compressor 101, the first heat exchanger 102, the first throttling component 104 and the evaporative condenser 30 in turn, and the second refrigerant circulates in the second compressor 202, the evaporative condenser 30, the second throttling component 203 and the second evaporator 201 in turn, resulting in heat exchange between the first refrigerant and the second refrigerant of different temperatures in the evaporative condenser 30, the first refrigerant evaporates in the evaporative condenser 30, and the second refrigerant condenses in the evaporative condenser 30, to freeze and cool the ultra-low temperature equipment provided with the ultra-low temperature refrigeration system.

[0064] III. When the time of the ultra-low temperature refrigeration system in the refrigeration mode reaches the preset refrigeration time, the ultra-low temperature refrigeration system will switch from the refrigeration mode to the defrosting mode, at this time the main control unit will close the secondary refrigeration system 20, and the main control unit controls the switching of the reversing valve 105, so that the outlet of the first compressor 101 communicates with the second heat exchanger 103, and the first heat exchanger 102 communicates with the inlet of the first compressor 101, at this time the first refrigerant circulates in the first compressor 101, the second heat exchanger 103, the first throttling component 104 and the first heat exchanger 102 in turn, to carry out defrosting; Wherein, the first heat exchanger 102 at this time is equivalent to an evaporator, and the second heat exchanger 103 is equivalent to a condenser. And after the time of the ultra-low temperature refrigeration system switching to the defrosting mode reaches the preset defrosting time, the main control unit switches to the starting mode or the refrigeration mode correspondingly.

[0065] Therefore, the defrosting is performed by starting the first refrigeration system 10, and the first refrigerant flows in the first compressor 101, the second heat exchanger 103, the first throttling component 104 and the first heat exchanger 102 in sequence to defrost the first heat exchanger 102; meanwhile, the second heat exchanger 103 is arranged adjacent to the second evaporator 201, and the heat generated by the second heat exchanger 103 can be transferred to the second evaporator 201 to defrost the second evaporator 201, so that the super-low temperature refrigeration system does not need to start the first refrigeration system 10 and the second refrigeration system 20 simultaneously, thereby reducing the load of the super-low temperature refrigeration system during defrosting and further reducing the energy consumption.

[0066] Meanwhile, when the super-low temperature refrigeration system is powered on and exits the defrosting mode to enter the refrigeration mode, the second heat exchanger 103 can be used as an evaporator, the master control unit starts the first refrigeration system 10 to perform primary refrigeration to precool the entire super-low temperature refrigeration system, and when the first refrigeration system 10 reaches the preset refrigeration temperature and cannot continue to reduce the temperature, the master control unit starts the second refrigeration system 20, thereby reducing the operation load of the super-low temperature refrigeration system and achieving the purpose of energy saving or low energy consumption.

[0067] In order to ensure that the first refrigerant does not flow into the second heat exchanger 103 when the super-low temperature refrigeration system is in the refrigeration mode and affects the refrigeration effect of the super-low temperature refrigeration system, the first throttling component 104 is arranged between the first heat exchanger 102 and the second heat exchanger 103. Figure 1 A first valve 106 is arranged between the first throttling component 104 and the second heat exchanger 103, and the first valve 106 is used to block the flow of the first refrigerant between the first throttling component 104 and the second heat exchanger 103.

[0068] In order to ensure that the first refrigerant does not flow into the evaporative condenser 30 when only the first refrigeration system 10 is started and affects the operation of the first refrigeration system 10, the first throttling component 104 is arranged between the first heat exchanger 102 and the evaporative condenser 30. Figure 1 A second valve 107 is arranged between the first throttling component 104 and the evaporative condenser 30, and the second valve 107 is used to block the flow of the first refrigerant between the first throttling component 104 and the evaporative condenser 30.

[0069] The use process of the super-low temperature refrigeration system is as follows:

[0070] I. Refer to the attached Figure 1 and 4When the ultra-low temperature refrigeration system is powered on and enters the starting mode, the main control unit starts the primary refrigeration system 10, controls the switching of the reversing valve 105, so that the outlet of the first compressor 101 communicates with the first heat exchanger 102, and the second heat exchanger 103 communicates with the inlet of the first compressor 101; at the same time, the main control unit opens the first valve 106 and closes the second valve 107, so that the first refrigerant only circulates in the first compressor 101, the first heat exchanger 102, the first throttling assembly 104 and the second heat exchanger 103 in sequence, to carry out primary refrigeration; at this time, the first heat exchanger 102 corresponds to the condenser, and the second heat exchanger 103 corresponds to the evaporator.

[0071] II. Refer to the attached drawings Figure 2 and 4 When the ultra-low temperature refrigeration system carries out primary refrigeration through the primary refrigeration system 10 and reduces the temperature of the corresponding chamber to the preset refrigeration temperature, the main control unit starts the secondary refrigeration system 20 at this time, so that the ultra-low temperature refrigeration system switches from the starting mode to the refrigeration mode, and at the same time, the main control unit closes the first valve 106 and opens the second valve 107, so that the first refrigerant only circulates in the first compressor 101, the first heat exchanger 102, the first throttling assembly 104 and the evaporative condenser 30 in sequence, and the second refrigerant circulates in the second compressor 202, the evaporative condenser 30, the second throttling assembly 203 and the second evaporator 201 in sequence, so that the first refrigerant and the second refrigerant at different temperatures exchange heat in the evaporative condenser 30, the first refrigerant evaporates in the evaporative condenser 30 and takes away heat; and the second refrigerant condenses in the evaporative condenser 30 and freezes the ultra-low temperature equipment provided with the ultra-low temperature refrigeration system.

[0072] III. Refer to the attached drawings Figures 3-4 When the time of the ultra-low temperature refrigeration system in the refrigeration mode reaches the preset refrigeration time, the ultra-low temperature refrigeration system switches from the refrigeration mode to the defrosting mode, at this time, the main control unit closes the secondary refrigeration system 20 and the second valve 107, and opens the first valve 106; at the same time, the main control unit controls the switching of the reversing valve 105, so that the outlet of the first compressor 101 communicates with the second heat exchanger 103, and the first heat exchanger 102 communicates with the inlet of the first compressor 101, so that the first refrigerant only circulates in the first compressor 101, the second heat exchanger 103, the first throttling assembly 104 and the first heat exchanger 102 in sequence, to carry out defrosting; at this time, the first heat exchanger 102 corresponds to the evaporator, and the second heat exchanger 103 corresponds to the condenser.

[0073] And after the time of the ultra-low temperature refrigeration system switching to the defrosting mode reaches the preset defrosting time, the main control unit switches to the starting mode or the refrigeration mode correspondingly.

[0074] Example 2

[0075] On the basis of the embodiment 1, refer to the attached Figure 5 The utility model also proposes a kind of ultra-low temperature equipment, the ultra-low temperature equipment includes the above-mentioned ultra-low temperature refrigeration system.

[0076] It needs to be explained that, ultra-low temperature equipment includes ultra-low temperature refrigerator, ultra-low temperature cold store and other need ultra-low temperature equipment, not limited here.For easy understanding, the ultra-low temperature equipment proposed in this embodiment is preferably an ultra-low temperature refrigerator.

[0077] And the cascade system of the ultra-low temperature equipment proposed in this embodiment is illustrated by the double-pole cascade system formed by primary refrigeration system 10 and secondary refrigeration system 20, but the principle of the double-pole cascade system of the ultra-low temperature refrigeration system proposed in this embodiment can be extended to other ultra-low temperature equipment with multi-pole cascade system, not limited here.

[0078] Therefore, when the time of the ultra-low temperature equipment in refrigeration mode reaches the preset refrigeration time, the main control unit will control the ultra-low temperature refrigeration system to enter defrosting mode, at this time, the main control unit will close the secondary refrigeration system 20, and the main control unit controls the switching of the reversing valve 105 to switch, so that the outlet of the first compressor 101 communicates with the second heat exchanger 103, and the first heat exchanger 102 communicates with the inlet of the first compressor 101, at this time, the first refrigerant circulates in the first compressor 101, the second heat exchanger 103, the first throttling assembly 104 and the first heat exchanger 102 in turn, to defrost the first heat exchanger 102; At the same time, because the second heat exchanger 103 is arranged adjacent to the second evaporator 201, the heat generated by the second heat exchanger 103 can also be transmitted to the second evaporator 201, so that the second evaporator 201 is defrosted, so the ultra-low temperature equipment proposed in the utility model does not need to start the primary refrigeration system 10 and the secondary refrigeration system 20 at the same time, thereby reducing the load of the ultra-low temperature equipment when defrosting, and further reducing energy consumption.

[0079] At the same time, when the ultra-low temperature equipment starts in the starting mode and exits the defrosting mode to enter the refrigeration mode, the second heat exchanger 103 can be used as an evaporator, the main control unit starts the primary refrigeration system 10 first to perform primary refrigeration, to precool the entire ultra-low temperature equipment, until the primary refrigeration system 10 reaches the preset refrigeration temperature and cannot continue to cool, then the main control unit starts the secondary refrigeration system 20, thereby reducing the operating load of the ultra-low temperature equipment, achieving the purpose of energy saving or less energy consumption.

[0080] Among them, in order to prevent the defrosting water formed when the ultra-low temperature equipment defrosts from affecting the operation of the ultra-low temperature equipment, refer to the attached Figure 5 The ultra-low temperature equipment includes a water pan structure 40, which is used to collect the defrosting water generated by the defrosting of the ultra-low temperature equipment. Of course, the water pan structure 40 can also collect condensate water or other liquids generated during the operation of the ultra-low temperature equipment.

[0081] Specifically, to ensure that the water pan structure 40 can smoothly collect defrosting water, with reference to the accompanying drawings Figure 6 The embodiment provides a water pan structure 40.

[0082] The water pan structure 40 comprises a water collecting groove 401 and a water pan 402.

[0083] The bottom of the second evaporator 201 of the secondary refrigeration system 20 is provided with the water collecting groove 401, and the lowest point in the water collecting groove 401 is communicated with the water pan 402 through a water collecting pipeline 403, and the water pan 402 is arranged on the top of the first heat exchanger 102.

[0084] The water collecting pipeline 403 is provided with a third valve 404, and the third valve 404 is used for controlling whether the defrosting water in the water collecting groove 401 can flow to the water pan 402.

[0085] In this way, when the ultra-low temperature equipment is in the defrosting mode, the main control unit controls the third valve 404 to be opened, so that the defrosting water in the water collecting groove 401 flows to the water pan 402 through the water collecting pipeline 403.

[0086] With reference to the accompanying drawings Figures 5-6 The bottom of the water pan 402 is provided with at least one fluid passage 405, and the fluid passage 405 is used for flowing the defrosting water to the first heat exchanger 102.

[0087] In this way, when the defrosting water flows to the outer surface of the first heat exchanger 102, the defrosting water can absorb heat from the first refrigerant in the first heat exchanger 102, thereby helping to reduce the temperature of the first refrigerant, thereby improving the heat exchange efficiency of the first heat exchanger 102, so that the first refrigerant can be cooled and liquefied more quickly, the working load of the first compressor 101 is reduced, the condensation load of the first heat exchanger 102 is reduced, and the energy efficiency ratio of the ultra-low temperature refrigeration system is improved; and the defrosting water can also help to clean the surface of the first heat exchanger 102, wash away dust, impurities and other pollutants, reduce the possibility of fouling, thereby prolonging the service life of the first heat exchanger 102 and maintaining its high-efficiency heat exchange performance.

[0088] Further, with reference to the accompanying drawings Figure 5 The inside of the ultra-low temperature equipment is provided with a condensing fan 60 corresponding to the first heat exchanger 102, and the condensing fan 60 is used for accelerating the defrosting water evaporated to the first heat exchanger 102.

[0089] In this way, the main control unit can start the condensing fan 60 to accelerate the evaporation speed of the defrosting water flowing to the first heat exchanger 102, causing the defrosting water to take away the heat of the first refrigerant in the first heat exchanger 102 faster, so that the first refrigerant can be cooled and liquefied faster, further reducing the working load of the first compressor 101, further reducing the condensing load of the first heat exchanger 102, and further improving the energy efficiency ratio of the ultra-low temperature refrigeration system. The condensing fan 60 can also enhance the flow of air around the first heat exchanger 102, bringing more low-temperature air into contact with the surface of the first heat exchanger 102, thereby further enhancing the heat dissipation effect of the first heat exchanger 102, allowing the first heat exchanger 102 to more effectively transfer heat to the surrounding environment. The condensing fan 60 can also prevent excessive water or water droplets from forming on the surface of the first heat exchanger 102, avoiding problems caused by water accumulation, such as freezing risk (in low-temperature conditions), local overheating, and other conditions, thereby ensuring that the first heat exchanger 102 is always in optimal working condition, reducing maintenance requirements and the likelihood of failure.

[0090] To prevent excessive defrosting water in the water pan 402 from overflowing and affecting the normal operation of the ultra-low temperature equipment, with reference to the accompanying drawings, Figure 5 The water pan 402 is provided with a liquid level sensor 50, which is used to detect the liquid level of the defrosting water in the water pan 402.

[0091] It should be noted that the liquid level sensor 50 is electrically connected to the main control unit, so that the main control unit can receive the warning signal sent by the liquid level sensor 50.

[0092] To prevent excessive defrosting water in the water pan 402 from overflowing and affecting the normal operation of the ultra-low temperature equipment, with reference to the accompanying drawings, Figure 5 The ultra-low temperature equipment includes a spraying structure 70, which is used to spray the pipeline components (not shown, same throughout) or other waterproof components inside the ultra-low temperature equipment.

[0093] In this way, when the ultra-low temperature equipment is defrosting, causing excessive defrosting water in the water pan 402 to reach the preset detection point, the liquid level sensor 50 will send a warning signal to the main control unit, causing the main control unit to start the spraying structure 70 to consume excessive defrosting water and prevent excessive defrosting water in the water pan 402 from overflowing and affecting the normal operation of the ultra-low temperature equipment. When the spraying structure 70 sprays the pipeline components and other waterproof components inside the ultra-low temperature equipment, it also has the effect of cleaning dust from the surface, reducing the risk of clogging, ensuring the normal circulation of the first refrigerant and the second refrigerant, and improving the reliability of the ultra-low temperature equipment during operation.

[0094] To prevent excessive defrosting water in the water pan 402 from overflowing and affecting the normal operation of the ultra-low temperature equipment, with reference to the accompanying drawings, Figure 7 The present embodiment proposes a spraying structure 70:

[0095] The spraying structure 70 comprises a water pump 701, a spraying pipeline 702 and a spraying head 703.

[0096] The water pump 701 is located in the water pan 402 and is used to extract the defrosting water collected in the water pan 402.

[0097] The spraying pipeline 702 is provided with a fourth valve 704 for controlling whether the defrosting water in the water pan 402 is sprayed from the spraying head 703.

[0098] When the defrosting water in the water pan 402 is excessive and reaches a preset detection point, the liquid level sensor 50 sends a warning signal to the main control unit, so that the main control unit controls the water pump 701 and the spraying head 703 to start and the fourth valve 704 to open, so that the water pump 701 extracts the defrosting water in the water pan 402 to the spraying head 703, and then the spraying head 703 sprays the pipeline components and other waterproof components inside the ultra-low temperature equipment, so as to clean the surface dust, reduce the dirty blockage phenomenon, ensure the normal circulation of the first refrigerant and the second refrigerant, and improve the reliability of the ultra-low temperature equipment during operation.

[0099] When the liquid level of the defrosting water in the water pan 402 is lower than the preset detection point, the main control unit will close the water pump 701, the spraying head 703 and the fourth valve 704, so as to ensure that there is enough defrosting water in the water pan 402 to flow to the outer surface of the first heat exchanger 102, ensure the heat exchange efficiency of the first heat exchanger 102, reduce the condensation load of the first heat exchanger 102, and improve the energy efficiency ratio of the ultra-low temperature refrigeration system.

[0100] In the drawings: Figure 5 The ultra-low temperature equipment of the embodiment is also provided with a cleaning fan 80 corresponding to the pipeline components and other components, and the cleaning fan 80 is electrically connected with the main control unit.

[0101] When the ultra-low temperature equipment is operated for a preset cleaning time, the main control unit starts the cleaning fan 80 to blow to the pipeline components and other components, so as to clean the surface dust, reduce the dirty blockage phenomenon, ensure the normal circulation of the first refrigerant and the second refrigerant, and improve the reliability of the ultra-low temperature equipment during operation.

[0102] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. An ultralow temperature refrigeration system comprising a primary refrigeration system (10), a secondary refrigeration system (20) and an evaporative condenser (30) and constituting a cascade system; characterized in that, The primary refrigeration system (10) comprises a first compressor (101), a first heat exchanger (102), a second heat exchanger (103) and a first throttling component (104); The outlet of the first compressor (101) is communicated with the first heat exchanger (102) and the second heat exchanger (103) through a reversing valve (105), the second heat exchanger (103) is communicated with the second heat exchanger (103) and an evaporative condenser (30) through the first throttling component (104), and the evaporative condenser (30) is also communicated with the inlet of the first compressor (101); The second heat exchanger (103) is communicated with the inlet of the first compressor (101) through the reversing valve (105), and the second heat exchanger (103) is arranged adjacent to a second evaporator (201) of the secondary refrigeration system (20); The first refrigerant flows in the first compressor (101), the first heat exchanger (102), the first throttling component (104) and the second heat exchanger (103) in sequence through the reversing valve (105).

2. The ultra-low temperature refrigeration system of claim 1, wherein, A first valve (106) is arranged between the first throttling component (104) and the second heat exchanger (103), and the first valve (106) is used to block the flow of the first refrigerant between the first throttling component (104) and the second heat exchanger (103).

3. The ultra-low temperature refrigeration system of claim 1, wherein, A second valve (107) is arranged between the first throttling component (104) and the evaporative condenser (30), and the second valve (107) is used to block the flow of the first refrigerant between the first throttling component (104) and the evaporative condenser (30).

4. A cryogenic apparatus, characterized by, The ultra-low temperature equipment comprises the ultra-low temperature refrigeration system according to any one of claims 1-3.

5. The ultra-low temperature apparatus of claim 4, wherein, The ultra-low temperature equipment comprises a water collecting tray structure (40) used to collect defrosting water generated by defrosting of the ultra-low temperature equipment.

6. The ultra-low temperature apparatus of claim 5, wherein, The water collecting tray structure (40) comprises a water collecting groove (401) and a water collecting tray (402); A water collecting groove (401) is arranged at the bottom of the second evaporator (201) of the secondary refrigeration system (20), the lowest point in the water collecting groove (401) is communicated with the water collecting tray (402) through a water collecting pipeline (403), and the water collecting tray (402) is arranged at the top of the first heat exchanger (102); A third valve (404) is arranged in the water collecting pipeline (403).

7. The ultra-low temperature apparatus of claim 6, wherein, A liquid level sensor (50) is arranged in the water collecting tray (402), and the liquid level sensor (50) is used to detect the liquid level of the defrosting water in the water collecting tray (402).

8. The ultra-low temperature apparatus of claim 6, wherein, At least one fluid channel (405) is arranged at the bottom of the water collecting tray (402), and the fluid channel (405) is used to flow the defrosting water to the first heat exchanger (102).

9. The ultra-low temperature apparatus of claim 4, wherein, A condensing fan (60) is arranged in the ultra-low temperature equipment corresponding to the first heat exchanger (102), and the condensing fan (60) is used to accelerate the defrosting water evaporated to the first heat exchanger (102).

10. The ultra-low temperature apparatus of claim 5, wherein, The ultra-low temperature device comprises a spraying structure (70) for spraying the pipeline assembly inside the ultra-low temperature device.

11. The ultra-low temperature apparatus of claim 10, wherein, The spraying structure (70) comprises a water pump (701), a spraying pipeline (702) and a spraying head (703); The water pump (701) is located in the water pan structure (40) and is used for pumping the defrosting water collected by the water pan structure (40); the water pump (701) is communicated with the spraying head (703) through the spraying pipeline (702), and the spraying head (703) is used for spraying the pipeline assembly inside the ultra-low temperature device; A fourth valve (704) is arranged in the spraying pipeline (702).

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