Refrigerator

Abstract

The present invention relates to a refrigerator, comprising at least two groups of absorption and evaporation systems connected in series; the evaporator and the absorber are connected so that the refrigerant vapor in the evaporator flows into the absorber; in at least two groups of absorption and evaporation systems, the absorber of the first group of absorption and evaporation systems is connected with the absorber of the second group of absorption and evaporation systems so that the absorbent solution in the first group of absorption and evaporation systems flows into the absorbent solution in the second group of absorption and evaporation systems; the absorber of the last group of absorption and evaporation systems is provided with a pipeline for cooling water circulation; the evaporator of the first group of absorption and evaporation systems is provided with a pipeline for external cold water circulation. By expanding the solution circulation concentration and circulation path, and by increasing the refrigerant circulation amount, the cooling water temperature used for cooling can be higher, and the heat source water temperature used for heating can be lower. At the same time, for heating and cooling, cooling water prepared by a cooling tower can be unnecessary, thereby improving energy utilization.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment, and in particular to a refrigerator. Background Art

[0002] Lithium bromide refrigeration unit is a device that uses steam, hot water, and fuel as driving heat sources and cooling water as cold source for refrigeration. Due to its advantages such as recycling waste heat, no pollution to the environment, and easy maintenance of the unit, this unit is becoming more and more widely used in air conditioning, process refrigeration and other fields. Lithium bromide units have two basic working conditions: one is refrigeration working condition, and the other is heat pump working condition. Under refrigeration working conditions, users use cold water output by the evaporator, while cooling water requires customers to use cooling towers or other methods to generate cooling water, and the cooling water inlet temperature cannot be too high; under heat pump working conditions, users use cooling water (also called hot network water), and the cold water inside the evaporator is used as a heat source, so it is also called heat source water.

[0003] At present, the normal refrigeration conditions are 12-7℃ for chilled water and 32-38℃ for cooling water. The higher the cooling water inlet temperature, the more severe the capacity decay. When the cooling water inlet temperature is higher than 40℃, the unit will alarm and shut down. In situations where cooling water needs to be used in a water-saving manner, or where the cooling water temperature is very high, such as desert water-scarce areas, areas where cooling water cannot be evaporated and cooled, etc., the traditional cooling tower system cannot be used to evaporate and cool the cooling water, and only air cooling can be used. At this time, the cooling water inlet temperature will be too high (exceeding or approaching 40℃), and the conventional lithium bromide refrigeration unit will not be able to operate.

[0004] Existing heat pumps require heat source water of about 30-20°C to produce 60°C hot water, and the heat of heat source water at about 12°C cannot be used. In situations where the heat source water temperature is too low, or where full use of heat is required, such as geothermal (using heat source water temperature of 15-9°C), conventional lithium bromide units cannot produce water above 60°C.

[0005] In situations where cooling and heating are used simultaneously, existing refrigerators can meet the needs of cooling and heating at the same time, and still require cooling water at about 32°C to participate in the refrigeration cycle. Therefore, the output cooling water usually needs to be passed into a cooling tower to be cooled to about 32°C before participating in the refrigeration cycle, which results in a large waste of cooling tower electricity and heat. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects in the prior art and provide a refrigerator. By adding a solution absorption link, the solution circulation concentration and circulation path are expanded, and by adding a refrigerant evaporation link, the refrigerant circulation volume is increased. Therefore, the cooling water temperature used for cooling can be higher, and the heat source water temperature used for heating can be lower. When heating and cooling are used at the same time, cooling water produced by a cooling tower is not required, thereby improving energy utilization.

[0007] To this end, the technical solution adopted is a refrigerator, comprising at least two groups of absorption and evaporation systems connected in series in sequence; the absorption and evaporation systems include an evaporator and an absorber; the evaporator and the absorber are connected so that the refrigerant vapor in the evaporator flows into the absorber; in at least two groups of the absorption and evaporation systems, the absorber of the first group of absorption and evaporation systems is connected to the absorber of the second group of absorption and evaporation systems, so that the absorbent solution in the absorber of the first group of absorption and evaporation systems flows into the absorbent solution of the absorber of the second group of absorption and evaporation systems; the absorber of the last group of absorption and evaporation systems is provided with a pipeline for cooling water circulation; the evaporator of the first group of absorption and evaporation systems is provided with a pipeline for external cold water circulation.

[0008] Preferably, in at least two groups of the absorption and evaporation systems, the absorber of the previous group of absorption and evaporation systems and the evaporator of the subsequent group of absorption and evaporation systems are connected, so that the cooling water in the absorber of the previous group of absorption and evaporation systems flows into the cooling water of the evaporator of the subsequent group of absorption and evaporation systems, forming an internal circulation water circulation route.

[0009] Preferably, the refrigerator also includes: a first generator and a condenser; the first generator is connected to the condenser so that the refrigerant vapor in the first generator flows into the condenser; the first generator is connected to the absorber of the first group of absorption and evaporation systems so that the absorbent solution in the first generator flows into the absorbent solution of the absorber of the first group of absorption and evaporation systems; the evaporator of the last group of absorption and evaporation systems is connected to the condenser so that the condensed water in the condenser flows into the evaporator of the last group of absorption and evaporation systems.

[0010] Preferably, the refrigerator further comprises: a channel for the circulation of heat source fluid is also provided in the first generator.

[0011] Preferably, a channel for cooling water circulation is provided in the condenser; the channel for cooling water circulation in the condenser is connected to the channel for cooling water circulation in the absorber of the last group of the absorption and evaporation system, and external cooling water flows through the absorber of the last group of the absorption and evaporation system and the condenser in turn to form a cooling water circulation circuit.

[0012] Preferably, the refrigerator also includes a second generator; a pipeline for circulating heat source fluid is provided in the second generator; the second generator is connected to the first generator, so that the refrigerant vapor in the second generator flows into the first generator as a heat source to heat the absorbent solution of the first generator.

[0013] Preferably, at least two groups of absorption and evaporation systems include a first shell in which a first evaporator and a first absorber are arranged, and the first evaporator and the first absorber are communicated with each other; a second shell in which a second evaporator and a second absorber are arranged, and the second evaporator and the second absorber are communicated with each other.

[0014] Preferably, the second absorber, the first generator, the second generator and the first absorber are connected in sequence to form a first absorbent solution circulation circuit; or the second absorber is connected in sequence with the second generator and the first generator, respectively, and the second generator and the first generator are connected in sequence with the first absorber, respectively, to form a second absorbent solution circulation circuit; or the second absorber, the second generator, the first generator and the first absorber are connected in sequence to form a third absorbent solution circulation circuit.

[0015] Preferably, the absorbent solution is a lithium bromide aqueous solution, and the concentration of the lithium bromide aqueous solution is 42-65%; the refrigerant is water.

[0016] Preferably, the cooling water input temperature is above 40°C, and the cold water input temperature is 12-16°C.

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. The refrigerator provided by the present invention can significantly increase the required temperature of cooling water in the use environment of the refrigerator from the original 32°C to a higher temperature, thereby expanding the use range of the cooling water temperature of the refrigerator.

[0019] 2. The refrigerator provided by the present invention can significantly reduce the required temperature of heat source water from the original 20°C to a lower temperature in the use environment of a heat pump, and can effectively utilize the waste heat of low-temperature heat source water to save energy.

[0020] 3. The refrigerator provided by the present invention can output cold water of a preset temperature when the input temperature of the low-temperature heat source water is relatively low in a heating and cooling environment;

[0021] At the same time, it supplies cooling water with a higher temperature and can output hot water of a preset temperature. It does not need cooling water produced by a cooling tower, thus improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a refrigerator provided by the present invention;

[0024] Figure 2 A schematic diagram of the structure of another refrigerator provided by the present invention;

[0025] Figure 3 A schematic diagram of the structure of another refrigerator provided by the present invention;

[0026] Figure 4 A schematic diagram of the structure of another refrigerator provided by the present invention;

[0027] 11-first evaporator; 12-first absorber; 13-second evaporator; 14-second absorber; 15-internal circulation pump; 16-first refrigerant pump; 17-second refrigerant pump; 18-first generator; 19-second generator; 20-condenser; 21-first heat exchanger; 22-second heat exchanger; 23-first concentrated solution pump; 24-second concentrated solution pump; 25-first solution pump; 26-second solution pump. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits detailed descriptions of known functions and known components.

[0031] An embodiment of the present invention provides a refrigerator, such as Figure 1-Figure 4 As shown, it includes: at least two groups of absorption and evaporation systems connected in series in sequence; the absorption and evaporation systems include an evaporator and an absorber; the evaporator and the absorber are connected so that the refrigerant vapor in the evaporator flows into the absorber; in at least two groups of the absorption and evaporation systems, the absorber of the first group of absorption and evaporation systems is connected with the absorber of the second group of absorption and evaporation systems, so that the absorbent solution in the absorber of the first group of absorption and evaporation systems flows into the absorbent solution of the absorber of the second group of absorption and evaporation systems; the absorber of the last group of absorption and evaporation systems is provided with a pipeline for circulating cooling water; the evaporator of the first group of absorption and evaporation systems is provided with a pipeline for circulating external cold water.

[0032] Some embodiments of the present invention are two groups of absorption and evaporation systems connected in series in sequence, including: a first shell, in which a first evaporator 11 and a first absorber 12 are arranged, and the first evaporator 11 and the first absorber 12 are connected; a second shell, in which a second evaporator 13 and a second absorber 14 are arranged, and the second evaporator 13 and the second absorber 14 are connected; the first absorber 12 and the second absorber 14 are connected; when the absorbent solution is set as a concentrated solution, it flows through the first absorber 12, and the concentrated solution absorbs the refrigerant vapor of the first evaporator 11 and then outputs an intermediate concentration solution, and the intermediate concentration solution enters the second absorber 14, and the intermediate concentration solution absorbs the refrigerant vapor of the second evaporator 13 and then outputs a dilute solution, forming an absorbent solution flow line, and the concentrated solution is diluted step by step and releases heat; cooling water flows through the second absorber 14, and the cooling water absorbs heat and heats up in the second absorber 14 and then outputs; cold water flows through the first evaporator 11, exchanges heat with the refrigerant vapor of the first evaporator 11, and the cold water temperature drops to a preset temperature and then outputs. Cold water (low-temperature heat source water) releases heat and cools down in the tube of the first evaporator 11, and the concentrated solution enters the first absorber 12, absorbs the refrigerant vapor from the first evaporator 11, and the refrigerant vapor liquefies and dissolves in the concentrated solution, dilutes to an intermediate concentration solution and releases heat. By adding a second absorber 14 to the internal absorbent solution cycle, a primary solution absorption link is added, and the change of the circulation concentration and the circulation path of the solution are expanded; the intermediate concentration solution enters the second absorber 14, and outputs a dilute solution and releases heat after absorbing the refrigerant vapor of the second evaporator 13; in this way, the second evaporator 13 is added to the refrigerant cycle, and a primary refrigerant evaporation link is added, which increases the refrigerant circulation amount, so that the cooling water temperature used for cooling can be high, and the heat source water temperature used for heating can be low. At the same time, heating and cooling can be performed without cooling water produced by a cooling tower, thereby improving energy utilization; the refrigerator provided by the present invention can be applied to high-temperature cooling water and low-temperature heat source water.

[0033] In the exemplary embodiment, the evaporator, absorber, generator and condenser all adopt shell and tube heat exchangers, the water circuit circulates in the tube side, the absorbent solution circulates in the shell side, and the refrigerant introduced into the evaporator circulates in the shell side.

[0034] In at least two groups of the absorption and evaporation systems, the absorber of the first group of absorption and evaporation systems is connected to the evaporator of the second group of absorption and evaporation systems, so that the cooling water in the absorber of the first group of absorption and evaporation systems flows into the cooling water of the evaporator of the second group of absorption and evaporation systems, forming an internal circulation water circulation route.

[0035] The refrigerator also includes: a first generator 18 and a condenser 20; the first generator 18 is connected to the condenser 20, so that the refrigerant vapor in the first generator 18 flows into the condenser 20; the first generator 18 is connected to the absorber of the first group of absorption and evaporation systems, so that the absorbent solution in the first generator 18 flows into the absorbent solution of the absorber of the first group of absorption and evaporation systems; the evaporator of the last group of absorption and evaporation systems is connected to the condenser 20, so that the condensed water in the condenser 20 flows into the evaporator of the last group of absorption and evaporation systems.

[0036] The refrigerator also includes: a channel for the heat source fluid to flow is also provided in the first generator 18.

[0037] The condenser 20 is provided with a channel for cooling water circulation; the channel for cooling water circulation in the condenser 20 is connected with the channel for cooling water circulation in the absorber of the last group of the absorption and evaporation system, and the external cooling water flows through the absorber of the last group of the absorption and evaporation system and the condenser 20 in sequence to form a cooling water circulation circuit.

[0038] The refrigerator also includes a second generator 19; a pipeline for circulating a heat source fluid is arranged in the second generator 19; the second generator 19 is connected to the first generator 18, so that the refrigerant vapor in the second generator 19 flows into the first generator 18 as a heat source to heat the absorbent solution of the first generator 18.

[0039] The second absorber 14, the first generator 18, the second generator 19 and the first absorber 12 are connected in sequence to form a first absorbent solution circulation circuit; or the second absorber 14 is connected in sequence with the second generator 19 and the first generator 18, respectively, and the second generator 19 and the first generator 18 are connected in sequence with the first absorber 12, respectively, to form a second absorbent solution circulation circuit; or the second absorber 14, the second generator 19, the first generator 18 and the first absorber 12 are connected in sequence to form a third absorbent solution circulation circuit.

[0040] In order to better transfer heat, the preferred solution is that the first absorber 12 is connected to the second evaporator 13, and an internal circulation pump 15 is provided outside the first shell and the second shell. The internal circulation water flows through the first absorber 12, the second evaporator 13 and the internal circulation pump 15 in sequence to form an internal circulation water circulation route, and the internal circulation water cools the concentrated solution in the first absorber 12. The internal circulation water absorbs heat and heats up in the first absorber 12, and cools the concentrated solution in the first absorber 12 at the same time, and releases heat and cools down in the second evaporator 13, thereby forming a cycle to complete the heat transfer, which also increases the cooling water heat transfer process, and can better realize the refrigerant evaporation of the second evaporator 13.

[0041] A first refrigerant pump 16 is provided outside the first shell, and the first refrigerant pump 16 is connected to the outlet of the first evaporator 11 through a pipeline. The first refrigerant flows through the first evaporator 11 and the first refrigerant pump 16 in sequence, and then enters the first evaporator 11 to form a first refrigerant circulation route; a second refrigerant pump 17 is provided outside the second shell, and the second refrigerant pump 17 is connected to the outlet of the second evaporator 13 through a pipeline. The second refrigerant flows through the second evaporator 13 and the second refrigerant pump 17 in sequence, and then enters the second evaporator 13 to form a second refrigerant circulation route. The first refrigerant forms a cycle, which can make the refrigerant exchange heat with cold water multiple times; the second refrigerant forms a cycle, which can make the refrigerant in the second evaporator 13 become steam after being heated and enter the second absorber 14 to liquefy and dilute the intermediate concentration solution. The first evaporator 11 and the second evaporator 13 can be connected by a pipeline to achieve the connection of the refrigerants.

[0042] In some embodiments of the present invention, the refrigerator also includes a generator, which is used for heating and concentrating a dilute solution, and the generator includes a first generator 18 and a second generator 19, the second generator 19 uses high-temperature steam as a heat source to heat the absorbent solution to generate refrigerant steam; the second generator 19 is connected to the first generator 18, and the refrigerant steam enters the first generator 18 to heat the absorbent solution of the first generator 18, and the absorbent solution generates refrigerant steam; the condenser 20 is used to cool the refrigerant steam generated by the first generator 18 and the second generator 19, so that the refrigerant steam condenses into liquid refrigerant, and uses the heat released during the condensation process to heat the cooling water; the condenser 20 is connected to the first generator 18, and the condenser 20 is connected to the second evaporator 13; the liquid refrigerant in the condenser 20 enters the second evaporator 13; the cooling water flows through the second absorber 14 and the condenser 20 in sequence to form a cooling water circulation circuit. When the liquid refrigerant in the condenser 20, ie, liquid water, enters the second evaporator 13, it expands rapidly and vaporizes, and absorbs a large amount of heat of the circulating cooling water in the second evaporator 13 during the vaporization process, thereby achieving the purpose of cooling and refrigerating.

[0043] There are two substances in the shell side of the second generator 19, one is the concentrated absorbent solution, and the other is the water vapor (refrigerant steam) generated after the solution is concentrated. This water vapor enters the tube side of the first generator 18 and serves as the heat source of the first generator 18 to heat the absorbent solution in the shell side of the first generator 18.

[0044] The dilute solution output by the second absorber 14 flows through the first generator 18 and the second generator 19 in sequence to form a concentrated solution, and then enters the first absorber 12 and the second absorber 14 in sequence to form an absorbent solution circulation circuit; or the dilute solution output by the second absorber 14 flows through the second generator 19 and the first generator 18 in sequence to form a concentrated solution, and then enters the first absorber 12 and the second absorber 14 in sequence to form an absorbent solution circulation circuit; or the dilute solution output by the second absorber 14 only flows through the second generator 19 or the first generator 18 to form a concentrated solution, and then enters the first absorber 12 and the second absorber 14 in sequence to form an absorbent solution circulation circuit; or the dilute solution output by the second absorber 14 is divided into two branches and flows through the second generator 19 and the first generator 18 at the same time to form a concentrated solution after merging, and then enters the first absorber 12 and the second absorber 14 in sequence to form an absorbent solution circulation circuit.

[0045] In some embodiments of the present invention, the refrigerator further includes a heat exchanger, which is used to achieve heat exchange between the concentrated solution and the dilute solution. The heat exchanger includes a first heat exchanger 21 and a second heat exchanger 22. The first heat exchanger 21 and the second heat exchanger 22 are both arranged on the absorbent solution circulation line. The first heat exchanger 21 is located between the second absorber 14 and the first generator 18, and the second heat exchanger 22 is located between the first generator 18 and the second generator 19. The temperature of the dilute solution output from the second absorber 14 is relatively low. In order to save the heat of heating the dilute solution and improve the thermal efficiency of the entire device, the first heat exchanger 21 allows the dilute solution output from the second absorber 14 to perform heat exchange with the concentrated solution flowing back from the first generator 18, thereby increasing the temperature of the dilute solution output from the second absorber 14; the second heat exchanger 22 performs heat exchange between the intermediate concentration solution output from the first generator 18 and the high-temperature and high-concentration solution flowing back through the second generator 19, thereby cooling the high-temperature and high-concentration solution.

[0046] In some embodiments of the present invention, the refrigerator also includes a first concentrated solution pump 23, which is arranged on the absorbent solution circulation line, and the first concentrated solution pump 23 is located on the concentrated solution loop between the generator and the first absorber 12; a second concentrated solution pump 24, which is arranged on the absorbent solution circulation line, and the second concentrated solution pump 24 is located between the first absorber 12 and the second absorber 14.

[0047] In some other embodiments of the present invention, the refrigerator also includes a first solution pump 25, which is arranged on the absorbent solution circulation line, the first solution pump 25 is located on the pipeline of the output dilute solution of the second absorber 14, and the first solution pump 25 is located between the second absorber 14 and the first heat exchanger 21.

[0048] The absorbent solution is a lithium bromide aqueous solution, and the concentration of the lithium bromide aqueous solution is 42-65%; the refrigerant is water. When the absorbent solution flows from the first absorber 12 to the second absorber 14, the concentration of the lithium bromide aqueous solution in the first absorber 12 is the largest, and the concentration of the lithium bromide aqueous solution output from the second absorber 14 is the smallest.

[0049] In some embodiments of the present invention, the cooling water input temperature is above 40°C, the cold water input temperature is 12-16°C, and the cold water output temperature is 7°C.

[0050] In some embodiments of the present invention, Figure 2 As shown, the dilute solution output from the second absorber 14 can be branched and connected in parallel to enter the first generator 18 and the second generator 19 at the same time; Figure 3 As shown, the dilute solution output from the second absorber 14 may first enter the second generator 19 and then enter the first generator 18; Figure 4 As shown, the dilute solution output from the second absorber 14 may also enter only one generator.

[0051] The heat source of the second generator can be steam, fuel, hot water, etc.

[0052] Working principle: the dilute solution output from the second absorber 14 is transported by the first solution pump 25, and after being heated in the first heat exchanger 21, it enters the first generator 18 for heating and concentration. A part of the intermediate concentration solution is transported by the second solution pump 26, and after being heated in the second heat exchanger 22, it enters the second generator 19 for heating and concentration. The high-temperature and high-concentration solution is cooled by the second heat exchanger 22, and then mixed with the remaining part of the intermediate concentration solution from the first generator 18 to form a concentrated solution, which is transported by the first concentrated solution pump 23 and enters the first absorber 12 to absorb the refrigerant vapor from the first evaporator 11 and is cooled by the internal circulating water. The intermediate concentration solution is transported to the second absorber 14 via the second concentrated solution pump 24, absorbs the refrigerant vapor from the second evaporator 13, and enters the first solution pump 25 after being cooled by cooling water for further circulation.

[0053] The refrigerant steam coming out of the second generator 19 enters the tube side of the first generator 18, heats the absorbent solution in the shell side, and at the same time, the refrigerant steam condenses into refrigerant water and enters the condenser 20. The refrigerant steam generated by the first generator 18 is condensed in the condenser 20, mixed with the refrigerant water from the first generator 18 and enters the second evaporator 13. The refrigerant enters the second evaporator 13 under the transportation of the second refrigerant pump 17, and undergoes self-circulation evaporation and heat absorption; the refrigerant enters the first evaporator 11 under the transportation of the first refrigerant pump 16, and undergoes self-circulation evaporation and heat absorption.

[0054] The cold water (low-temperature heat source water) releases heat and cools down in the tube of the first evaporator 11. The internal circulation water absorbs heat and heats up in the first absorber 12, releases heat and cools down in the second evaporator 13, and evaporates the refrigerant in the second evaporator 13. The cooling water (heat network water) absorbs heat and heats up in the second absorber 14, and continues to absorb heat and heat up in the condenser 20.

[0055] According to the absorbent solution circulation described above, due to the increase of solution absorption link, the circulation concentration and circulation path are expanded, which can significantly reduce the demand temperature of heat source water (cold water), from the original 20 ℃ to about 12 ℃; at the same time, due to the increase of refrigerant evaporation link, the refrigerant circulation volume is increased, which can significantly increase the demand temperature of cooling water, from the original 32 ℃ to about 40 ℃, and expand the use range of the refrigerator cooling water temperature; therefore, in an environment where heating and cooling are used at the same time, when the input temperature of low-temperature heat source water is 12 ℃, 7 ℃ of cold water can be output; at the same time, 40 ℃ of cooling water is supplied, and 60 ℃ of hot water can be output, which does not require cooling water produced by cooling tower, thereby improving energy utilization.

[0056] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of this application should be determined with reference to the attached claims and the full range of equivalent forms of these claims.

Claims

1. A refrigerator, characterized in that: include: At least two groups of absorption and evaporation systems connected in series; The absorption and evaporation system comprises an evaporator and an absorber; The evaporator and the absorber are in communication, so that the refrigerant vapor in the evaporator flows into the absorber; In at least two groups of the absorption and evaporation systems, the absorbers of the first group of absorption and evaporation systems are connected to the absorbers of the second group of absorption and evaporation systems, so that the absorbent solution in the absorber of the first group of absorption and evaporation systems flows into the absorbent solution in the absorber of the second group of absorption and evaporation systems; The absorber of the last group of absorption and evaporation systems is provided with a pipeline for circulating cooling water; The evaporator of the absorption evaporation system of the first group is provided with a pipeline for circulating external cold water; In at least two groups of the absorption and evaporation systems, the absorber of the first group of absorption and evaporation systems is connected to the evaporator of the second group of absorption and evaporation systems, so that the cooling water in the absorber of the first group of absorption and evaporation systems flows into the cooling water of the evaporator of the second group of absorption and evaporation systems, forming an internal circulation water circulation route.

2. The refrigerator according to claim 1, characterized in that Also includes: a first generator (18) and a condenser (20); The first generator (18) is in communication with the condenser (20), so that the refrigerant vapor in the first generator (18) flows into the condenser (20); The first generator (18) is in communication with the absorber of the first group of absorption and evaporation systems, so that the absorbent solution in the first generator (18) flows into the absorbent solution in the absorber of the first group of absorption and evaporation systems; The last group of evaporators of the absorption and evaporation system is connected to the condenser (20), so that the condensed water in the condenser (20) flows into the last group of evaporators of the absorption and evaporation system.

3. The refrigerator according to claim 2, characterized in that: Also includes: The first generator (18) is also provided with a channel for the circulation of heat source fluid.

4. The refrigerator according to claim 2, characterized in that: The condenser (20) is provided with a channel for cooling water to flow; The channel for cooling water circulation in the condenser (20) is connected to the channel for cooling water circulation in the absorber of the last group of the absorption and evaporation system, and the external cooling water flows through the absorber of the last group of the absorption and evaporation system and the condenser (20) in sequence to form a cooling water circulation circuit.

5. The refrigerator according to any one of claims 2 to 4, characterized in that: Also includes a second generator (19); The second generator (19) is provided with a pipeline for circulating a heat source fluid; The second generator (19) is connected to the first generator (18), so that the refrigerant vapor in the second generator (19) flows into the first generator (18) as a heat source to heat the absorbent solution in the first generator (18).

6. The refrigerator according to claim 5, characterized in that At least two groups of absorption and evaporation systems include a first shell in which a first evaporator (11) and a first absorber (12) are arranged, and the first evaporator (11) and the first absorber (12) are connected; and a second shell in which a second evaporator (13) and a second absorber (14) are arranged, and the second evaporator (13) and the second absorber (14) are connected.

7. The refrigerator according to claim 6, characterized in that The second absorber (14), the first generator (18), the second generator (19) and the first absorber (12) are connected in sequence to form a first absorbent solution circulation circuit; or The second absorber (14) is connected in sequence with the second generator (19) and the first generator (18), respectively, and the second generator (19) and the first generator (18) are connected in sequence with the first absorber (12), respectively, to form a second absorbent solution circulation circuit; or The second absorber (14), the second generator (19), the first generator (18) and the first absorber (12) are connected in sequence to form a third absorbent solution circulation circuit.

8. The refrigerator according to claim 6, characterized in that Also includes: A heat exchanger is used to achieve heat exchange between a concentrated solution and a dilute solution, the heat exchanger comprising a first heat exchanger (21) and a second heat exchanger (22), the first heat exchanger (21) and the second heat exchanger (22) are both arranged on an absorbent solution circulation line, the first heat exchanger (21) is located between a second absorber (14) and a first generator (18), and the second heat exchanger (22) is located between the first generator (18) and the second generator (19).

9. The refrigerator according to claim 1, characterized in that: The cooling water input temperature is above 40°C, and the cold water input temperature is 12-16°C.

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