Circulating cooling and heating system

Abstract

The circulating cooling and heating system comprises a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a storage tank (4), a throttling element (1003) and a circulating pump (5). Liquid and gaseous refrigerants are stored in the storage tank (4); the compressor (1) is used for absorbing a low-temperature and low-pressure gaseous refrigerant and compressing the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant; the first heat exchanger (2), the second heat exchanger (3), the storage tank (4) and the circulating pump (5) are communicated together through a plurality of pipelines, valves are arranged on parts of the pipelines, and the cooling and heating system is controlled to be switched between cooling and heating through opening and closing of part of the valves.

Description

Technical Field

[0001] The present invention belongs to a heating and cooling system, especially a circulating heating and cooling system. Background Art

[0002] Air source heat pumps are a relatively common heating method currently.

[0003] However, in the prior art, the refrigerant is directly expanded in the heat exchanger to transfer the cold to the outside, and the heat transfer efficiency of the heat exchanger is relatively low, thus the overall efficiency of the system is low. In addition, in the prior art, when the ambient temperature is low in winter, the outdoor heat exchanger frosts quickly and defrosts frequently. Defrosting is useless work for the terminal, so the overall energy consumption of the system is high and the heating efficiency is low. Moreover, the prior art is used for heating in winter, but the equipment is out of use in summer, and the equipment has a single function. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a circulating heating and cooling system to overcome the drawback that the air source heat pump in the prior art can only be used for heating in winter. And in the heating mode, the waste heat of the system is utilized to increase the temperature of the cooled medium, thereby improving the heating efficiency.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] A circulating heating and cooling system, characterized by comprising: a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a storage tank (4), a throttling element (1003) and a circulation pump (5);

[0007] The storage tank (4) stores liquid and gaseous refrigerants;

[0008] The compressor (1) is used to absorb low-temperature and low-pressure gaseous refrigerant and compress it into high-temperature and high-pressure gaseous refrigerant;

[0009] The first heat exchanger (2) is used to condense the high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant;

[0010] Or, absorb heat and evaporate the medium-temperature and low-pressure liquid refrigerant after being pressurized by the circulation pump into low-temperature and low-pressure gaseous refrigerant;

[0011] The second heat exchanger (3) is used to utilize the waste heat of the medium-temperature and high-pressure liquid refrigerant to increase the temperature of the heat exchange medium; absorb and evaporate the medium-temperature and low-pressure liquid refrigerant after being pressurized by the circulation pump into low-temperature and low-pressure gaseous refrigerant;

[0012] Or, condense the high-temperature and high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant and subcool the medium-temperature and high-pressure liquid refrigerant again;

[0013] The first heat exchanger (2), the second heat exchanger (3), the storage tank (4), and the circulation pump (5) are connected together through a plurality of pipelines, and valves and the throttling element (1003) are provided on some of the plurality of pipelines. The switching between refrigeration and heating of the above-mentioned cooling and heating system is controlled by the opening and closing of some valves.

[0014] After the present invention adopts the above solution, it realizes the switching between refrigeration and heating through valve control, realizes multiple functions of one device, avoids multiple equipment investments by users, and reduces the equipment investment cost.

[0015] Other features and advantages of the present invention will be described in the following specification, and partly will become obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structure specifically pointed out in the written specification and the drawings. Brief Description of the Drawings

[0016] The present invention will be described in detail below with reference to the drawings to make the above advantages of the present invention more clear. Among them,

[0017] Figure 1 is a schematic structural diagram of the circulating cooling and heating system of the present invention;

[0018] Figure 2 is a schematic pipeline diagram of the circulating cooling and heating system of the present invention in the heating mode;

[0019] Figure 3 is a schematic pipeline diagram of the circulating cooling and heating system of the present invention in the refrigeration mode. Detailed Description of the Embodiment

[0020] The following will describe in detail the embodiments of the present invention with reference to the drawings and embodiments, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present invention and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0021] As Figure 1 shown, a circulating cooling and heating system includes: a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a throttling element (1003), a storage tank (4), and a circulation pump (5);

[0022] The storage tank (4) stores liquid and gaseous refrigerants;

[0023] The compressor (1) is used to absorb low-temperature and low-pressure gaseous refrigerant and compress it into high-temperature and high-pressure gaseous refrigerant;

[0024] The first heat exchanger (2) is used to condense the high-pressure gaseous refrigerant formed by the compressor into a medium-temperature high-pressure liquid refrigerant; or, to absorb heat and evaporate the low-temperature low-pressure liquid refrigerant after being pressurized by the circulation pump into a low-temperature low-pressure gaseous refrigerant;

[0025] The second heat exchanger (3) is used to utilize the waste heat of the medium-temperature high-pressure liquid refrigerant to increase the temperature of the heat exchange medium; to absorb and evaporate the low-temperature low-pressure liquid refrigerant after being pressurized by the circulation pump into a low-temperature low-pressure gaseous refrigerant;

[0026] Or, to condense the high-temperature high-pressure gaseous refrigerant formed by the compressor into a medium-temperature high-pressure liquid refrigerant, and to subcool the medium-temperature high-pressure liquid refrigerant again;

[0027] The first heat exchanger (2), the second heat exchanger (3), the storage tank (4), and the circulation pump (5) are connected together through a plurality of pipelines, and valves and the throttling element (1003) are provided on some of the plurality of pipelines. The switching between refrigeration and heating of the above-mentioned heating and cooling system is controlled by opening and closing some of the valves.

[0028] After the present invention adopts the above scheme, it realizes the switching between refrigeration and heating through valve control, realizes multiple uses of one device, avoids multiple equipment investments by users, and reduces the equipment investment cost.

[0029] Among them, the throttling element (1003) adjusts the opening degree of the valve according to the load of the system. Among them, the throttling element (1003) is not limited to manual, mechanical, electromagnetic, electric, etc. In addition, the number and type of valves are not limited to the description of this scheme, and other pipeline accessories such as filters can be added as needed during actual implementation.

[0030] The compressor (1) is not limited to centrifugal, screw, piston, scroll, rotor, etc., the first heat exchanger (2) and the second heat exchanger (3) are not limited to finned, plate, shell-and-tube, etc., and one side of the heat exchanger is a refrigerant, and the medium on the other side is not limited to other fluids such as air and water.

[0031] Different from the prior art, in the embodiment of the present invention, the first heat exchanger (2) and the second heat exchanger (3) are filled with liquid refrigerant, and these liquid refrigerants are in full contact with the heat exchange surface, and the heat exchange between the liquid refrigerant and the heat exchange medium is realized. Through the above-mentioned flooded overfeeding method, the heat exchange area of the heat exchanger can be fully utilized, the suction superheat of the compressor can be reduced, and thus the overall efficiency of the system can be improved, achieving the effect of energy conservation and emission reduction.

[0032] In addition, the second heat exchanger (3) has two independent heat exchange pipeline systems. The second heat exchange pipeline system is respectively connected to the circulation pump (5) and the storage tank (4), and the first heat exchange pipeline system is respectively connected to the first heat exchanger (2) and the storage tank (4). In the embodiment, there is no limitation on whether the two pipelines are a unified whole, and they can be two separate components.

[0033] More specifically, as Figure 1 shown, in one embodiment, a circulating cooling and heating system includes: a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a storage tank (4), and a circulation pump (5);

[0034] The compressor (1) has a first interface (11) and a second interface (12);

[0035] The first heat exchanger (2) has a third interface (21) and a fourth interface (22);

[0036] The second heat exchanger (3) has four interfaces, namely a fifth interface (31) and a sixth interface (32) of the first heat exchange pipeline system, and a seventh interface (33) and an eighth interface (34) of the second heat exchange pipeline system;

[0037] The storage tank (4) has a ninth interface (41), a tenth interface (42), an eleventh interface (43), and a twelfth interface (44);

[0038] Both ends of the circulation pump (5) have a thirteenth interface (51) and a fourteenth interface (52);

[0039] The fourth interface (22) and the fifth interface (31) are respectively connected together through a third pipeline (201) and a fourth pipeline (202), and a second valve (1002) is provided at the connection of the pipelines;

[0040] The third interface (21) and the first interface (11) are connected together through a connecting pipeline composed of a second pipeline (102) and a first pipeline (101), and a first valve (1001) is provided at the connection of the above two pipelines;

[0041] The second interface (12) and the twelfth interface (44) are connected together through a ninth pipeline (402);

[0042] The ninth interface (41) and the sixth interface (32) are connected together through a connecting pipeline composed of a sixth pipeline (302) and a fifth pipeline (301), and a throttling element (1003) is provided at the connection of the two pipelines;

[0043] The eleventh interface (43) and the seventh interface (33) are connected together through a connecting pipeline composed of a seventh pipeline (303) and a sixth pipeline (302), and a fifth valve (1005) is provided at the connection of the two pipelines;

[0044] The tenth interface (42) and the thirteenth interface (51) are connected together through an eighth pipeline (401); the fourteenth interface (52) and the eighth interface (34) are connected together through a connecting pipeline composed of a tenth pipeline (501) and an eleventh pipeline (502), and a fourth valve (1004) is provided at the connection of the pipelines.

[0045] Among them, in a more preferred embodiment, branch pipelines composed of a nineteenth pipeline (902) and an eighteenth pipeline (901) are respectively connected to both sides of the first valve (1001), and a ninth valve (1009) is provided at the intersection of the two pipelines; and, branch pipelines composed of a seventeenth pipeline (802) and a sixteenth pipeline (801), and an eighth valve (1008) is provided at the connection of the two pipelines, and these two pipelines are respectively connected to both ends of the fourth valve (1004).

[0046] As Figure 1 shown, it can be seen that the sixteenth pipeline (801) is located on the side of the fourth valve (1004) close to the second heat exchanger (3) and is connected to the eleventh pipeline (502), and the nineteenth pipeline (902) is located on the side of the fourth valve (1004) close to the circulation pump (5) and is connected to the tenth pipeline (501) together.

[0047] Branch pipelines composed of a thirteenth pipeline (602) and a twelfth pipeline (601) are respectively provided at both ends of the second valve (1002), and a sixth valve (1006) is provided between them; and, branch pipelines composed of a fifteenth pipeline (702) and a fourteenth pipeline (701), and a seventh valve (1007) is provided between them, and these two pipelines are respectively connected to both ends of the fifth valve (1005).

[0048] As Figure 1 shown, the twelfth pipeline (601) is located on the side of the fifth valve (1005) close to the second heat exchanger (3) and is connected to the sixth pipeline (302) together, and the fourteenth pipeline (701) is located on the side of the fifth valve (1005) close to the storage tank (4) and is connected to the seventh pipeline (303) together.

[0049] In the heating mode, the first valve (1001), the second valve (1002), the fourth valve (1004), and the fifth valve (1005) are opened, and the sixth valve (1006), the seventh valve (1007), the eighth valve (1008), and the ninth valve (1009) are closed. At this time, the relevant pipelines form as shown in Figure 2 shown.

[0050] At this time, a low-temperature and low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature and high-pressure gaseous refrigerant in the compressor (1), and then transported to the first heat exchanger (2). In the first heat exchanger (2), the high-temperature and high-pressure gaseous refrigerant condenses into a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant then continues to enter the second heat exchanger (3). After raising the temperature of the heat exchange medium in the second heat exchanger (3), it enters the storage tank (4) after being depressurized by the throttling element (1003), and is continuously sucked by the circulation pump (5). After being pressurized by the circulation pump, it enters the second heat exchanger (3) again. Part of the refrigerant absorbs heat and evaporates from the low-temperature and low-pressure liquid into a low-temperature and low-pressure gas. The two-phase refrigerant is discharged and enters the storage tank (4). The gaseous refrigerant in the storage tank (4) is continuously sucked by the compressor (1) to form a cycle under heating. Among them, through the waste heat recovery of the medium-temperature and high-pressure liquid refrigerant, the temperature of the above heat exchanger can be fully increased, thereby reducing the defrosting frequency or even eliminating defrosting, reducing the loss of ineffective work, and improving the system efficiency.

[0051] In the cooling mode, the first valve (1001), the second valve (1002), the fourth valve (1004), and the fifth valve (1005) are closed, and the sixth valve (1006), the seventh valve (1007), the eighth valve (1008), and the ninth valve (1009) are opened. In addition, the relevant pipelines are as shown in Figure 3 shown.

[0052] At this time, a low-temperature and low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature and high-pressure gaseous refrigerant in the compressor (1), and enters the second heat exchanger (3). In the second heat exchanger (3), the high-temperature and high-pressure gaseous refrigerant condenses into a medium-temperature and high-pressure liquid refrigerant. After being discharged, it enters the second heat exchanger (3) again. The medium-temperature and high-pressure refrigerant is cooled again in the second heat exchanger (3), enters the storage tank (4) after being depressurized by the throttling element (1003), and is sucked by the circulation pump (5). After being pressurized by the circulation pump, it enters the first heat exchanger (2). Part of the refrigerant absorbs heat and evaporates from the low-temperature and low-pressure liquid into a low-temperature and low-pressure gas. The two-phase refrigerant is discharged into the storage tank (4). The gaseous refrigerant in the storage tank (4) is sucked by the compressor (1) again to complete the system cycle in the cooling mode. Among them, through the function of the refrigerant flowing through the independent pipeline at the bottom shown in the heat exchanger (3), the supply temperature of the refrigerant can be reduced during summer cooling, and the energy efficiency ratio of the system can be improved.

[0053] In one embodiment, the above-mentioned circulating cooling and heating system can be centrally arranged in a modular device, that is, the compressor, condenser, evaporator, and throttling device are all within the device. The device is highly integrated, occupies a small space, and does not need to occupy the original building, reducing the building cost and improving the installation and construction efficiency.

[0054] In another embodiment, a energy storage scheme can be optionally configured for summer refrigeration and winter heating, and it can operate during the low electricity price period of the off-peak electricity time period. During the peak time period, only the circulating device operates, reducing the equipment operation cost.

[0055] In the embodiment, the power of a single modular device is 6 kw to 2000 kw, which can adapt to a large end area.

[0056] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention 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 embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A circulating cooling and heating system, characterized in that, Comprising: A compressor (1), a first heat exchanger (2), a second heat exchanger (3), a storage tank (4), a throttling element (1003) and a circulation pump (5); The storage tank (4) stores liquid and gaseous refrigerants; The compressor (1) is used to absorb low-temperature and low-pressure gaseous refrigerant and compress it into high-temperature and high-pressure gaseous refrigerant; The first heat exchanger (2) is used to condense the high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant; Or, the low-temperature and low-pressure liquid refrigerant in the refrigerant pressurized by the circulation pump absorbs heat and evaporates into low-temperature and low-pressure gaseous refrigerant; The second heat exchanger (3) is used to utilize the waste heat of the medium-temperature and high-pressure liquid refrigerant to increase the temperature of the heat exchange medium; absorb and evaporate the low-temperature and low-pressure liquid refrigerant in the refrigerant pressurized by the circulation pump into low-temperature and low-pressure gaseous refrigerant; Or, condense the high-temperature and high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant, and subcool the medium-temperature and high-pressure liquid refrigerant again; The first heat exchanger (2), the second heat exchanger (3), the storage tank (4), and the circulation pump (5) are connected together through a plurality of pipelines, and valves and the throttling element (1003) are provided on some of the plurality of pipelines. The opening and closing of some valves are used to control the switching between refrigeration and heating of the above heating and cooling system.

2. The circulating cooling and heating system according to claim 1, characterized in that The throttling element (1003) is also used to adjust the opening degree of the valve according to the load of the system.

3. The circulating cooling and heating system according to claim 1 or 2, characterized in that, The first heat exchanger (2) and the second heat exchanger (3) are filled with liquid refrigerant, and these liquid refrigerants are in full contact with the heat exchange surface, and heat exchange between the liquid refrigerant and the heat exchange medium is realized.

4. The circulating cooling and heating system according to claim 3, characterized in that, In the first heat exchanger (2) and the second heat exchanger (3), the heat exchange medium is a mixture of air or water.

5. The circulating cooling and heating system according to claim 1, characterized in that The second heat exchanger (3) has two independent heat exchange pipeline systems. The second heat exchange pipeline system is respectively connected to the circulation pump (5) and the storage tank (4), and the first heat exchange pipeline system is respectively connected to the first heat exchanger (2) and the storage tank (4).

6. The circulating cooling and heating system according to claim 1 or 2, characterized in that, The compressor (1) has a first interface (11) and a second interface (12); The first heat exchanger (2) has a third interface (21) and a fourth interface (22); The second heat exchanger (3) has four interfaces, namely a fifth interface (31) and a sixth interface (32) of the first heat exchange pipeline system, and a seventh interface (33) and an eighth interface (34) of the second heat exchange pipeline system; The storage tank (4) has a ninth interface (41), a tenth interface (42), an eleventh interface (43) and a twelfth interface (44); The circulation pump (5) has a thirteenth interface (51) and a fourteenth interface (52); The fourth interface (22) and the fifth interface (31) are respectively connected together through a third pipeline (201) and a fourth pipeline (202), and a second valve (1002) is provided at the connection of the pipelines; The third interface (21) and the first interface (11) are connected together through a connection pipeline composed of a second pipeline (102) and a first pipeline (101), and a first valve (1001) is provided at the connection of the above two pipelines; The second interface (12) and the twelfth interface (44) are connected together through the ninth pipeline (402); The ninth interface (41) and the sixth interface (32) are connected together through a connecting pipeline composed of the sixth pipeline (302) and the fifth pipeline (301), and a throttling element (1003) is provided at the connection of the two pipelines; The eleventh interface (43) and the seventh interface (33) are connected together through a connecting pipeline composed of the seventh pipeline (303) and the sixth pipeline (302), and a fifth valve (1005) is provided at the connection of the two pipelines; The tenth interface (42) and the thirteenth interface (51) are connected together through the eighth pipeline (401); the fourteenth interface (52) and the eighth interface (34) are connected together through a connecting pipeline composed of the tenth pipeline (501) and the eleventh pipeline (502), and a fourth valve (1004) is provided at the connection of the pipelines.

7. The circulating cooling and heating system according to claim 6, wherein, On both sides of the first valve (1001), there are respectively connected sub-pipelines composed of the nineteenth pipeline (902) and the eighteenth pipeline (901), and a ninth valve (1009) is provided at the intersection of the two pipelines; and, a sub-pipeline composed of the seventeenth pipeline (802) and the sixteenth pipeline (801), and an eighth valve (1008) is provided at the connection of the two pipelines, and these two pipelines are respectively connected to both ends of the fourth valve (1004).

8. The circulating cooling and heating system according to claim 7, wherein At both ends of the second valve (1002), there are respectively provided sub-pipelines composed of the thirteenth pipeline (602) and the twelfth pipeline (601), and a sixth valve (1006) is provided therebetween; and, a sub-pipeline composed of the fifteenth pipeline (702) and the fourteenth pipeline (701), and a seventh valve (1007) is provided therebetween, and these two pipelines are respectively connected to both ends of the fifth valve (1005).

9. The circulating cooling and heating system according to claim 8, wherein In the heating mode, the first valve (1001), the second valve (1002), the fourth valve (1004), and the fifth valve (1005) are opened, and the sixth valve (1006), the seventh valve (1007), the eighth valve (1008), and the ninth valve (1009) are closed; a low-temperature and low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature and high-pressure gaseous refrigerant in the compressor (1), and then transported to the first heat exchanger (2). In the first heat exchanger (2), the high-temperature and high-pressure gaseous refrigerant condenses into a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant then continues to enter the second heat exchanger (3), and after raising the temperature of the heat exchange medium in the second heat exchanger (3), it enters the storage tank (4) after being depressurized by the throttling element (1003), and is then continuously sucked by the circulation pump (5). After being pressurized by the circulation pump, it enters the second heat exchanger (3) again. Part of the refrigerant absorbs heat and evaporates from the low-temperature and low-pressure liquid into a low-temperature and low-pressure gas. The two-phase refrigerant is discharged and enters the storage tank (4), and the gaseous refrigerant in the storage tank (4) is continuously sucked by the compressor (1) to form a cycle under heating.

10. The circulating cooling and heating system according to claim 8, wherein, In the refrigeration mode, the first valve (1001), the second valve (1002), the fourth valve (1004), and the fifth valve (1005) are closed, and the sixth valve (1006), the seventh valve (1007), the eighth valve (1008), and the ninth valve (1009) are opened; a low-temperature and low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature and high-pressure gaseous refrigerant in the compressor (1), and enters the second heat exchanger (3), where it condenses from a high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. After being discharged, it enters the second heat exchanger (3) again. The medium-temperature and high-pressure refrigerant is cooled again in the second heat exchanger (3), enters the storage tank (4) after being depressurized by the throttling element (1003), and is sucked by the circulation pump (5). After being pressurized by the circulation pump, it enters the first heat exchanger (2). Part of the refrigerant absorbs heat and evaporates from a low-temperature and low-pressure liquid into a low-temperature and low-pressure gas, and the two-phase refrigerant is discharged into the storage tank (4). The gaseous refrigerant in the storage tank (4) is sucked into the compressor (1) again to complete the system cycle in the refrigeration mode.

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