A thermal system for a cold storage, its steam defrosting method and a cold storage

Abstract

The present invention provides a thermal system for a cold storage, its steam defrosting method and a cold storage. Among them, the thermal system for the cold storage includes a refrigeration system circulation loop and a water system circulation loop; the refrigeration system circulation loop is provided with an evaporator and a condenser; the water system circulation loop is provided with a water tank, and the water tank forms a first circulation loop with the condenser and a second circulation loop with the evaporator; the first circulation loop uses the water in the water tank to absorb the heat of the condenser; the second circulation waterway uses the water in the water tank to generate steam to defrost the evaporator. When the cold storage is refrigerated, the present invention uses the water in the water tank to exchange heat with the refrigerant in the condenser, thereby reducing the temperature of the condenser and improving the heat exchange effect; at the same time, the condensation heat is used to raise the temperature of the water and reduce the conditions for the water to turn into steam; during defrosting, the water in the water tank is turned into steam and introduced into the evaporator for defrosting, which can defrost evenly, has a good defrosting effect and is energy-saving.

Description

Technical Field

[0001] The invention belongs to the technical field of cold storage, and in particular relates to a thermal system for cold storage, a steam defrosting method and the cold storage. Background Art

[0002] At present, the defrosting methods used by evaporators are mainly the following: 1. Thermal fluorine defrosting; 2. Water defrosting; 3. Electric heating defrosting. Thermal fluorine defrosting is to introduce the high-temperature and high-pressure gaseous refrigerant discharged from the compressor into the evaporator. The gaseous refrigerant releases heat in the evaporator to melt the frost layer on the evaporator. However, when the ambient temperature is lower than 18°C, the exhaust temperature of the compressor is low, resulting in a low temperature of the gaseous refrigerant entering the evaporator, which cannot normally melt the frost layer on the evaporator, causing the evaporator to be blocked and the air duct to circulate poorly, thereby affecting the refrigeration effect and increasing the load on the compressor; therefore, the use of thermal fluorine defrosting alone will prolong the defrosting time, increase the power consumption, and affect the life of the compressor. If there is water in the evaporator, the frost layer on the evaporator will turn into an ice layer when it is refrigerated again, thus affecting the refrigeration effect; electric heating defrosting is a relatively common defrosting method in defrosting, but the energy consumption of electric heating defrosting is high, and there is a large fluctuation in the storage temperature during defrosting. Summary of the invention

[0003] In view of this, the present invention provides a thermal system for a cold storage, a steam defrosting method thereof, and a cold storage, so as to solve the problem of frosting of the evaporator.

[0004] In order to solve the above technical problems, the first aspect of the present invention provides a thermal system for cold storage, the thermal system comprising a refrigeration system circulation loop and a water system circulation loop;

[0005] The refrigeration system circulation loop is equipped with an evaporator and a condenser;

[0006] The water system circulation loop is provided with a water tank, which forms a first circulation loop with the condenser and a second circulation loop with the evaporator;

[0007] The first circulation loop uses water in the water tank to absorb the heat of the condenser;

[0008] The second circulating water circuit uses the water in the water tank to generate steam to defrost the evaporator.

[0009] Further optionally, a first control valve is provided on the first circulation loop; and a second control valve is provided on the second circulation waterway.

[0010] Further optionally, the thermal system for cold storage also includes:

[0011] The filter is arranged on the first circulation loop pipeline between the water outlet of the condenser and the water tank, and is used to filter out impurities in the condensed water.

[0012] Further optionally, a steam pipe for defrosting is preset on the evaporator, and the steam generated by the water in the water tank is introduced into the steam pipe for defrosting.

[0013] Further optionally, the thermal system is further provided with a gas-liquid mixing pump and a heating device;

[0014] The first circulation loop and the second circulation loop are provided with a common branch, and the water tank and the gas-liquid mixing pump are arranged on the common branch;

[0015] The first circulation loop includes a condenser, a water tank, a gas-liquid mixing pump and a first control valve connected by water fluid;

[0016] The second circulation loop includes a water tank, a gas-liquid mixing pump, a second control valve and an evaporator connected by water fluid;

[0017] The water tank is provided with a first inlet WA, a second inlet WB and a fluid outlet WC. Among them, the fluid outlet WC is communicated with the inlet of the gas-liquid mixing pump through the first circulation loop, the first inlet WA is communicated with the outlet of the condenser through the first circulation loop, and the second inlet WB is communicated with the outlet of the evaporator through the second circulation loop;

[0018] The condenser is provided with a first inlet CA and a first outlet CA, a second inlet CB and a second outlet CB. Among them, the first inlet CA and the first outlet CA are connected to the refrigeration system circulation loop, and the second inlet CB and the second outlet CB are connected to the first circulation loop of the water system; inside the condenser, a refrigerant flow path is formed between the first inlet CA and the first outlet CA, and a water flow path is formed between the second inlet CB and the second outlet CB;

[0019] The evaporator is provided with a first inlet EA and a first outlet EA, a second inlet EB and a second outlet EB. Among them, the first inlet EA and the first outlet EA are connected to the refrigeration system circulation loop, and the second inlet EB and the second outlet EB are connected to the second circulation loop of the water system; inside the evaporator, a refrigerant flow path is formed between the first inlet EA and the first outlet EA, and a water flow path is formed between the second inlet EB and the second outlet EB;

[0020] The heating device is arranged inside the water tank or on the common branch or on the side of the second inlet EB of the evaporator in the second circulation loop;

[0021] When the cold storage is refrigerated, the water in the water tank is transported to the condenser to cool the condenser, and then returns to the water tank; when the evaporator is defrosted, the condensed water in the water tank is heated to be converted into steam and then introduced into the evaporator for defrosting.

[0022] The second aspect of the present invention provides a steam defrosting method for the thermal system for cold storage in the first aspect. The steam defrosting method includes:

[0023] When the cold storage is refrigerating, the water in the water tank is conveyed to the condenser to cool the condenser, and the condensed water from cooling the condenser is collected and returned to the water tank; when it is determined that defrosting of the evaporator is required, the water in the water tank is converted into steam and then introduced into the evaporator for defrosting.

[0024] Further optionally, the water is conveyed to the condenser to cool the condenser, and the condensed water from cooling the condenser is collected; when it is determined that defrosting of the evaporator is required, the condensed water is converted into steam and then introduced into the evaporator for defrosting, including:

[0025] Control both the pump body and the first control valve to open, and control both the heating device and the second control valve to close, so as to pump the water in the water tank into the condenser, and utilize the water to absorb the condensation heat generated by the condenser;

[0026] Judge whether defrosting of the evaporator is required;

[0027] If so, close the first control valve and the pump body, and control the heating device to work to convert the water inside it into steam, open the second control valve, and introduce the steam into the inside of the evaporator for defrosting.

[0028] Further optionally, judging whether defrosting of the evaporator is required includes:

[0029] Obtain the refrigeration operation duration, and judge whether the refrigeration operation duration is greater than or equal to a first preset duration;

[0030] If so, it is regarded that defrosting of the evaporator is required.

[0031] Further optionally, controlling the heating device to work to convert the water inside it into steam, opening the second control valve, and introducing the steam into the inside of the evaporator for defrosting includes:

[0032] Obtain the defrosting heating duration, and judge whether the defrosting heating duration is greater than or equal to a second preset duration;

[0033] If so, open the second control valve, and introduce the generated steam into the inside of the evaporator for defrosting;

[0034] Obtain the steam introduction duration, and judge whether the steam introduction duration is greater than or equal to a third preset duration;

[0035] If so, close the second control valve and the heating device, and open the first control valve and the pump body.

[0036] The third aspect of the present invention provides a cold storage, which is provided with any one of the thermal systems in the first aspect or any one of the steam defrosting methods in the second aspect.

[0037] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0038] When the present invention is used for refrigeration in a cold storage, heat exchange occurs between the refrigerant in the condenser and the water in the water tank, thereby reducing the temperature of the condenser, improving the heat exchange effect, and at the same time using the condensation heat to raise the temperature of the water and reducing the conditions for the water to turn into steam. During defrosting, steam is introduced into the evaporator to perform defrosting, which can achieve uniform defrosting, good defrosting effect and energy saving.

[0039] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Brief Description of the Drawings

[0040] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0041] Figure 1 Shows a schematic structural diagram of a thermal system for a cold storage according to an embodiment of the present invention.

[0042] Figure 2 Shows a schematic structural diagram of an evaporator according to an embodiment of the present invention.

[0043] Figure 3 Shows a schematic diagram of a steam defrosting method for a thermal system for a cold storage according to an embodiment of the present invention.

[0044] Figure 4 Shows a schematic diagram of a steam defrosting method for a thermal system for a cold storage according to an embodiment of the present invention.

[0045] Wherein: 1 - compressor; 2 - condenser; 3 - first control valve; 4 - second control valve; 5 - heating device; 6 - gas-liquid mixing pump; 7 - water tank; 8 - throttling device; 9 - filter; 10 - evaporator; 11 - fin; 12 - heat copper tube; 13 - steam pipe socket.

[0046] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "contacted", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] When the refrigeration unit is working normally, as time goes by, the evaporator will be frosted on its surface due to the low working environment temperature. This will greatly reduce the refrigeration effect of the unit. At present, the commonly used defrosting methods for cold storage evaporators are generally: thermal fluorine defrosting; water defrosting; electric heating defrosting. Thermal fluorine defrosting is to introduce the high-temperature and high-pressure gaseous refrigerant discharged from the compressor into the evaporator. The gaseous refrigerant releases heat in the evaporator to melt the frost layer on the evaporator. However, when the ambient temperature is lower than 18°C, the exhaust temperature of the compressor is low, resulting in a low temperature of the gaseous refrigerant entering the evaporator, which cannot normally melt the frost layer on the evaporator, causing the evaporator to be blocked and the air duct circulation to be poor, thereby affecting the refrigeration effect and increasing the load on the compressor; therefore, simply using the thermal fluorine defrosting method will prolong the defrosting time, increase power consumption, and affect the life of the compressor. However, in case of water defrosting, if there is water in the evaporator, the frost layer on the evaporator will turn into ice layer when cooling again, thus affecting the refrigeration effect. Electric heating defrosting is a relatively common defrosting method, but the energy consumption of electric heating defrosting is high, and there is a large fluctuation in the storage temperature during defrosting.

[0050] To this end, the first aspect of this embodiment provides a thermal system for a cold storage. Figure 1 , a thermal system for a cold storage, the thermal system comprising a refrigeration system circulation loop and a water system circulation loop;

[0051] The refrigeration system circulation loop is provided with an evaporator 10 and a condenser 2;

[0052] The water system circulation loop is provided with a water tank 7, which forms a first circulation loop with the condenser 2 and a second circulation loop with the evaporator 10;

[0053] The first circulation loop uses the water in the water tank 7 to absorb the heat of the condenser 2;

[0054] The second circulating water circuit utilizes the water in the water tank 7 to generate steam to defrost the evaporator 10 .

[0055] For ease of control, preferably, a first control valve 3 is provided on the first circulation loop; a second control valve 4 is provided on the second circulation waterway; specifically, the first control valve 3 and the second control valve 4 are preferably solenoid valves.

[0056] Further optionally, the thermal system for the cold storage also includes: a filter 9, which is arranged on the first circulation loop pipeline between the water outlet of the condenser 2 and the water tank 7, and the filter 9 is used to filter out impurities in the condensed water.

[0057] Specifically, no water pipes are arranged on the condenser 2, and the water in the water tank can be directly sprayed on the condenser 2. Further, a container with a water outlet can be arranged below the condenser 2 to discharge the collected condensed water, and after passing through the filter 9, it is sent into the water tank 7. In this way, the water in the water tank 7 can be recycled. Since the water is directly sprayed on the condenser and then the condensed water is recovered. There will be impurities such as dust on the condenser. If not filtered, the condensed water will bring them into the water tank and enter the cycle. It may cause damage to the pump body. Secondly, after the impurities enter the heating device, they may cause the impurities to deposit at the bottom of the heating device.

[0058] Further optionally, a defrosting steam pipe is preset on the evaporator 10, and the steam generated by the water in the water tank 7 is introduced into the defrosting steam pipe.

[0059] Specifically, the evaporator 10 is preferably a fin, and a heat exchange copper pipe 12 is arranged inside the fin. The heat exchange copper pipe 12 is used for circulating the refrigerant to enable the normal refrigeration of the cold storage; a plurality of steam pipe insertion holes 13 are opened on the surface of the fin, and these steam hole insertion holes 13 are used to arrange steam pipelines in the evaporator 10. The steam pipelines are used to introduce steam to defrost the evaporator. Thus, the steam can be used for uniform defrosting, and the defrosting effect is better, thereby ensuring the refrigeration effect of the unit.

[0060] Further optionally, the thermal system is also provided with a gas-liquid mixing pump 6 and a heating device 5;

[0061] The first circulation loop and the second circulation loop are provided with a common branch, and the water tank 7 and the gas-liquid mixing pump 6 are arranged on the common branch;

[0062] The first circulation loop includes a condenser 2, a water tank 7, a gas-liquid mixing pump 6 and a first control valve that are connected by water fluid;

[0063] The second circulation loop includes a water tank 7, a gas-liquid mixing pump 6, a second control valve and an evaporator 10 that are connected by water fluid;

[0064] The first circulation loop and the second circulation loop are provided with a common branch, and the water tank 7 and the gas-liquid mixing pump 6 are arranged on the common branch;

[0065] The water tank is provided with a first inlet WA, a second inlet WB and a fluid outlet WC. Among them, the fluid outlet WC is connected to the inlet of the gas-liquid mixing pump 6 through the first circulation loop, the first inlet WA is connected to the outlet of the condenser 2 through the first circulation loop, and the second inlet WB is connected to the outlet of the evaporator 10 through the second circulation loop;

[0066] The condenser 2 is provided with a first inlet CA and a first outlet CA, a second inlet CB and a second outlet CB. The first inlet CA and the first outlet CA are connected to the refrigeration system circulation loop, and the second inlet CB and the second outlet CB are connected to the first circulation loop of the water system. Inside the condenser 2, a refrigerant flow path is formed between the first inlet CA and the first outlet CA, and a water flow path is formed between the second inlet CB and the second outlet CB.

[0067] The evaporator 10 is provided with a first inlet EA and a first outlet EA, a second inlet EB and a second outlet EB. The first inlet EA and the first outlet EA are connected to the refrigeration system circulation loop, and the second inlet EB and the second outlet EB are connected to the second circulation loop of the water system. Inside the evaporator 10, a refrigerant flow path is formed between the first inlet EA and the first outlet EA, and a water flow path is formed between the second inlet EB and the second outlet EB.

[0068] The heating device 5 is arranged inside the water tank or on the common branch or on the second inlet EB side of the evaporator 10 in the second circulation loop. In this embodiment, it is preferably to arrange the heating device 5 on the common branch.

[0069] During the refrigeration of the cold storage, the water in the water tank is delivered to the condenser 2 to cool the condenser 2, and then returns to the water tank. When the evaporator 10 defrosts, the condensed water in the water tank is heated to turn into steam and then introduced into the evaporator 10 for defrosting.

[0070] In this embodiment, during the refrigeration of the cold storage, the refrigerant in the condenser 2 exchanges heat with the water in the water tank, thereby reducing the temperature of the condenser 2, improving the heat exchange effect, and at the same time using the condensation heat to heat the water and reducing the condition for the water to turn into steam. During defrosting, the steam is introduced into the evaporator 10 for defrosting, which can defrost evenly, has a good defrosting effect and is energy-saving.

[0071] Preferably in this embodiment, the gas-liquid mixing pump 6 is connected to the condenser 2 through the heating device 5, that is, the water pumped out by the gas-liquid mixing pump 6 first passes through the heating device 5 and then is pumped into the condenser 2. Using the water pumped by the gas-liquid mixing pump 6 to exchange heat with the refrigerant in the condenser 2 can reduce the temperature of the condenser 2, thereby improving its heat exchange effect. At the same time, using the condensation heat to heat the water can reduce the adjustment of the water turning into steam, so the energy consumption required for steam defrosting can be reduced. The heating device 5 heats the water inside it into steam and introduces the steam into the steam pipeline in the evaporator 10 to defrost the frost layer in the evaporator with the steam, which can defrost evenly and has a better defrosting effect.

[0072] In addition, the single pump body is divided into a water pump and an air pump. In this embodiment, if a single pump body is to be used, both of the above two pumps need to be used, resulting in the complication of the system. Therefore, the gas-liquid mixing pump is preferably used in this embodiment.

[0073] In the second aspect of this embodiment, a steam defrosting method for the thermal system of a cold storage in the first aspect is provided. The steam defrosting method includes steps S1 to S2, where:

[0074] S1, when the cold storage is refrigerating, pump the water in the water tank to the condenser to cool the condenser, and collect the condensed water from the cooled condenser and return it to the water tank;

[0075] S2, when it is determined that defrosting of the evaporator is required, convert the water in the water tank into steam and introduce it into the evaporator for defrosting.

[0076] In the steam defrosting method of this embodiment, when the cold storage is refrigerating, heat exchange occurs between the refrigerant in the condenser 2 and the water in the water tank, thereby reducing the temperature of the condenser 2, improving the heat exchange effect, and at the same time using the condensation heat to heat the water and reducing the conditions for converting water into steam. During defrosting, steam is introduced into the evaporator 10 for defrosting, which can achieve uniform defrosting, good defrosting effect and energy saving.

[0077] Optionally, combined with Figure 3 , when the cold storage is refrigerating, this steam defrosting method pumps water to the condenser to cool the condenser and collects the condensed water from the cooled condenser; when it is determined that defrosting of the evaporator is required, convert the condensed water into steam and introduce it into the evaporator for defrosting, including steps A1 to A3, where:

[0078] A1, when the cold storage is refrigerating, control both the pump body and the first control valve to be open, and control both the heating device and the second control valve to be closed, so as to pump the water in the water tank into the condenser and use the water to absorb the condensation heat generated by the condenser;

[0079] A2, determine whether defrosting of the evaporator is required; if so, execute S3;

[0080] A3, close the first control valve and the pump body, control the heating device to work to convert the water inside it into steam, open the second control valve, and introduce the steam into the evaporator for defrosting.

[0081] In the steam defrosting method of this embodiment, when the unit is operating in normal refrigeration mode, the compressor 1 compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then the refrigerant enters the condenser 2 for heat exchange. At the same time, the first control valve 3 and the gas-liquid mixing pump 6 are opened to pump the condensed water in the water tank 7 to the condenser 2 to absorb the generated condensation heat, improving the heat exchange effect of the condenser 2. After that, the condensed water flows back to the water tank 7 through the filter 9. After heat exchange, the high-temperature and high-pressure refrigerant becomes a low-temperature and high-pressure refrigerant, which is throttled to a low-temperature and low-pressure refrigerant through the electronic expansion valve, and then evaporates and absorbs heat through the evaporator 10 to become a low-pressure and high-temperature refrigerant and flows back to the compressor 1. In addition, during the refrigeration process, it is necessary to determine whether defrosting of the evaporator 10 is required. If so, the first control valve 3 and the pump body 6 are closed, and the heating device 5 starts to heat the condensed water therein to turn the condensed water into steam. Then, the second control valve 4 is opened to introduce the steam into the evaporator 10 for steam defrosting. If not, the condensed water continues to be pumped to the condenser 2 for heat exchange with the refrigerant in the condenser 2.

[0082] Further optionally, in combination with Figure 4 , step A2 includes A21~A22, where:

[0083] A21, obtain the refrigeration operation duration and determine whether the refrigeration operation duration is greater than or equal to the first preset duration; if so,

[0084] A22, it is regarded that defrosting of the evaporator is required.

[0085] Generally, defrosting starts after 8 hours of refrigeration operation. In this embodiment, the first preset duration is preferably 8 hours. Specifically, starting from when the unit starts to operate, the time when the defrosting of the unit starts is set as t1, with the unit of seconds. Determine that the timing time t≥t1-T, where T is the defrosting heating time, and T is calculated as T = CmΔT / ƞP, where C is the specific heat of water, m is the mass of water, ΔT is the changing temperature, ƞ is the heating efficiency, and ƞ generally takes values of 90% - 98%, and P is the heating power. If the condition is met, the first control valve 3 and the gas-liquid mixing pump 6 are closed, and the heating device 5 starts to heat the condensed water therein. If the condition is not met, the condensed water continues to be pumped to the condenser 2 for heat exchange with it.

[0086] After the unit has met the condition of t≥t1-T, determine whether t≥t1. If the condition is met, the second control valve 4 and the gas-liquid mixing pump 6 are opened, and the high-temperature steam in the heating device 5 is pressed into the steam pipe reserved in the evaporator 10 through the gas-liquid mixing pump 6, and defrosting is carried out through the heat exchange between the steam pipe and the fins and the heat radiation with the heat exchange copper tube 12. If the condition is not met, the second control valve 4 and the gas-liquid mixing pump 6 remain closed.

[0087] Further optionally, in step S3, the heating device is controlled to operate to convert the water inside it into steam, and the second control valve is opened to introduce the steam into the evaporator for defrosting, including steps A31 to A34, where:

[0088] A31, obtain the defrost heating duration, and determine whether the defrost heating duration is greater than or equal to the second preset duration; if so, execute A32;

[0089] A32, open the second control valve and introduce the generated steam into the evaporator for defrosting;

[0090] A33, obtain the steam introduction duration, and determine whether the steam introduction duration is greater than or equal to the third preset duration; if so, execute A34;

[0091] A34, close the second control valve and the heating device, and open the first control valve and the pump body.

[0092] Generally, the steam introduction duration is within 5 min - 13 min, that is, the value range of the third preset duration is within 5 min - 13 min; the defrost heating duration is T, and its calculation formula is T = CmΔT / ƞP, and the second preset duration is greater than or equal to T. Specifically, set the defrost end time of the unit as t2, and t2 > t1. Determine t ≥ t2, if the condition is satisfied, then the second control valve 4 is closed, the first control valve 3 is opened, and the heating device 5 stops working, and the defrost ends. If the condition is not satisfied, continue defrosting.

[0093] In the third aspect of this embodiment, a cold storage is provided, including the thermal system according to any one of the first aspects or the steam defrosting method according to any one of the second aspects.

[0094] The thermal system for cold storage, its steam defrosting method and the cold storage provided by this embodiment enable the refrigerant to exchange heat with water through the condenser. On the one hand, the heat exchange effect is improved, and on the other hand, the water for steam defrosting can be preheated, reducing the conditions for water to turn into steam, that is, recycling the heat generated by the condenser, thus being more energy - saving; by arranging pipes in the evaporator, the steam can defrost evenly during defrosting.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0096] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0097] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A thermal system for a cold storage, characterized in that: The thermal system includes a refrigeration system circulation loop and a water system circulation loop; The refrigeration system circulation loop is provided with an evaporator and a condenser; The water system circulation loop is provided with a water tank, and the water tank forms a first circulation loop with the condenser and a second circulation loop with the evaporator; The first circulation loop uses the water in the water tank to absorb the heat of the condenser; The second circulation loop uses the water in the water tank to generate steam to defrost the evaporator; The thermal system is further provided with a heating device. When the evaporator is defrosted, the condensed water in the water tank is heated to turn it into steam and then introduced into the evaporator for defrosting.

2. The thermal system for cold storage as described in claim 1, wherein: A first control valve is provided on the first circulation loop; a second control valve is provided on the second circulation loop.

3. The thermal system for cold storage according to claim 2, characterized in that, The thermal system for the cold storage further includes: A filter is provided on the first circulation loop pipeline between the water outlet of the condenser and the water tank, and the filter is used to filter impurities in the condensed water.

4. The thermal system for cold storage according to claim 2, wherein A steam pipe for defrosting is preset on the evaporator, and the steam generated by the water in the water tank is introduced into the steam pipe for defrosting.

5. The thermal system for the cold storage according to any one of claims 2-4, wherein: The thermal system is further provided with a gas-liquid mixing pump; The first circulation loop and the second circulation loop are provided with a common branch, and the water tank and the gas-liquid mixing pump are arranged on the common branch; The first circulation loop includes a condenser, a water tank, a gas-liquid mixing pump and a first control valve connected by water fluid; The second circulation loop includes a water tank, a gas-liquid mixing pump, a second control valve and an evaporator connected by water fluid; The water tank is provided with a first inlet WA, a second inlet WB and a fluid outlet WC. Among them, the fluid outlet WC is connected to the inlet of the gas-liquid mixing pump through the first circulation loop, the first inlet WA is connected to the outlet of the condenser through the first circulation loop, and the second inlet WB is connected to the outlet of the evaporator through the second circulation loop; The condenser is provided with a first inlet CA and a first outlet CA, a second inlet CB and a second outlet CB. Among them, the first inlet CA and the first outlet CA are connected to the refrigeration system circulation loop, and the second inlet CB and the second outlet CB are connected to the first circulation loop of the water system; inside the condenser, a refrigerant flow path is formed between the first inlet CA and the first outlet CA, and a water flow path is formed between the second inlet CB and the second outlet CB; The evaporator is provided with a first inlet EA and a first outlet EA, a second inlet EB and a second outlet EB. Among them, the first inlet EA and the first outlet EA are connected to the refrigeration system circulation loop, and the second inlet EB and the second outlet EB are connected to the second circulation loop of the water system; inside the evaporator, a refrigerant flow path is formed between the first inlet EA and the first outlet EA, and a water flow path is formed between the second inlet EB and the second outlet EB; The heating device is arranged inside the water tank or on the common branch or on the side of the second inlet EB of the evaporator in the second circulation loop; When the cold storage is refrigerated, the water in the water tank is transported to the condenser to cool the condenser, and then returns to the water tank.

6. A steam defrosting method for the thermal system for cold storage according to any one of claims 2-5, characterized in that, The defrosting method includes: When the cold storage is refrigerating, the water in the water tank is conveyed to the condenser to cool the condenser, and the condensed water for cooling the condenser is collected and returned to the water tank; when it is determined that defrosting of the evaporator is required, the water in the water tank is converted into steam and introduced into the evaporator for defrosting.

7. The vapor defrosting method according to claim 6, characterized in that, Conveying water to the condenser to cool the condenser, and collecting the condensed water for cooling the condenser; when it is determined that defrosting of the evaporator is required, converting the condensed water into steam and introducing it into the evaporator for defrosting, includes: Controlling both the pump body and the first control valve to be opened, and controlling both the heating device and the second control valve to be closed, so as to pump the water in the water tank into the condenser and utilize the water to absorb the condensation heat generated by the condenser; Judging whether defrosting of the evaporator is required; If so, closing the first control valve and the pump body, and controlling the heating device to operate to convert the water inside it into steam, opening the second control valve, and introducing the steam into the interior of the evaporator for defrosting.

8. The vapor defrosting method according to claim 7, characterized in that, Judging whether defrosting of the evaporator is required, includes: Obtaining the refrigeration operation duration, and judging whether the refrigeration operation duration is greater than or equal to a first preset duration; If so, it is regarded that defrosting of the evaporator is required.

9. The vapor defrosting method according to claim 8, wherein Controlling the heating device to operate to convert the water inside it into steam, opening the second control valve, and introducing the steam into the interior of the evaporator for defrosting, includes: Obtaining the defrosting heating duration, and judging whether the defrosting heating duration is greater than or equal to a second preset duration; If so, opening the second control valve and introducing the generated steam into the interior of the evaporator for defrosting; Obtaining the steam introduction duration, and judging whether the steam introduction duration is greater than or equal to a third preset duration; If so, closing the second control valve and the heating device, and opening the first control valve and the pump body.

10. A cold storage, which is provided with the thermal system according to any one of claims 1-5 or the steam defrosting method according to any one of claims 6-9.

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