Circulating cooling and heating system

Abstract

The utility model discloses a circulating cooling and heating system which 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 utility model belongs to a cooling and heating system, in particular to a circulating cooling and heating system. Background Art

[0002] Air source heat pump is currently a more commonly used heating method.

[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 exchange efficiency of the heat exchanger is low, and the overall efficiency of the system is low. In addition, when the ambient temperature is low in winter, the outdoor heat exchanger part frosts quickly and defrosts frequently, while defrosting is useless for the terminal, and the overall energy consumption of the system is high and the heating efficiency is low. In addition, the prior art heats in winter, but the equipment is disabled in summer, and the equipment has a single function. Utility Model Content

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

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

[0006] A circulating cooling and heating system, characterized in that it 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);

[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, the low-temperature and low-pressure liquid refrigerant in the refrigerant pressurized by the circulating pump absorbs heat and evaporates into a 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 low-temperature and low-pressure liquid refrigerant in the refrigerant pressurized by the circulating pump into a low-temperature and low-pressure gaseous refrigerant;

[0012] Or, condensing the high-temperature and high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant, and supercooling 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 arranged on some of the plurality of pipelines, and the switching between cooling and heating of the above-mentioned heating and cooling system is controlled by opening and closing some of the valves.

[0014] After the utility model adopts the above scheme, the switching between cooling and heating is realized through valve control, so that one device can be used for multiple purposes, avoiding multiple device investments by users and reducing equipment investment costs.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a detailed description of the present invention in conjunction with the accompanying drawings to make the above advantages of the present invention more clear.

[0017] Figure 1 It is a structural schematic diagram of the utility model circulating cooling and heating system;

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

[0019] Figure 3 It is a schematic diagram of the pipelines of the circulating cooling and heating system of the utility model in the cooling mode. DETAILED DESCRIPTION

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

[0021] like Figure 1 As shown, a circulating cooling and heating system comprises: a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a throttling element (1003), a storage tank (4) and a circulating 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 medium-temperature and high-pressure liquid refrigerant; or to absorb heat and evaporate the low-temperature and low-pressure liquid refrigerant in the refrigerant pressurized by the circulating pump into low-temperature and low-pressure gaseous refrigerant;

[0025] 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 circulating pump into a low-temperature and low-pressure gaseous refrigerant;

[0026] Or, condensing the high-temperature and high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant, and supercooling the medium-temperature and 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 arranged on some of the plurality of pipelines, and the switching between cooling and heating of the above-mentioned heating and cooling system is controlled by opening and closing some of the valves.

[0028] In the first heat exchanger (2) and the second heat exchanger (3), the heat exchange medium is a mixture of air or water.

[0029] After the utility model adopts the above scheme, the switching between cooling and heating is realized through valve control, so that one device can be used for multiple purposes, avoiding multiple device investments by users and reducing equipment investment costs.

[0030] The throttling element (1003) adjusts the opening degree of the valve according to the load of the system. 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 solution. In actual implementation, other pipeline accessories such as filters can be added as needed.

[0031] 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 fin, plate, sleeve, etc. One side of the heat exchanger is refrigerant, and the medium on the other side is not limited to other fluids such as air and water.

[0032] Different from the prior art, in the embodiment of the utility model, the first heat exchanger (2) and the second heat exchanger (3) are filled with liquid refrigerant, and the liquid refrigerant is fully in contact with the heat exchange surface, and heat exchange between the liquid refrigerant and the heat exchange medium is achieved. Through the above-mentioned full liquid excess liquid supply method, the heat exchange area of ​​the heat exchanger can be fully utilized, the compressor suction superheat can be reduced, and the overall efficiency of the system can be improved, achieving the effect of energy saving and emission reduction.

[0033] 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, it is not limited whether the two sections of pipeline are a unified whole, and they can be two separate parts.

[0034] More specifically, if Figure 1 As shown, in one embodiment, a circulating cooling and heating system comprises: a compressor (1), a first heat exchanger (2), a second heat exchanger (3), a storage tank (4) and a circulating pump (5);

[0035] The compressor (1) has a first interface (11) and a second interface (12);

[0036] The first heat exchanger (2) has a third interface (21) and a fourth interface (22);

[0037] 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;

[0038] The storage tank (4) has a ninth interface (41), a tenth interface (42), an eleventh interface (43) and a twelfth interface (44);

[0039] The two ends of the circulation pump (5) are provided with a thirteenth interface (51) and a fourteenth interface (52);

[0040] The fourth interface (22) and the fifth interface (31) are connected together through a third pipeline (201) and a fourth pipeline (202) respectively, and a second valve (1002) is provided at the connection point of the pipelines;

[0041] The third interface (21) and the first interface (11) are connected together via a connecting pipeline formed by a second pipeline (102) and a first pipeline (101), and a first valve (1001) is provided at the connection point of the two pipelines;

[0042] The second interface (12) and the twelfth interface (44) are connected together via a ninth pipeline (402);

[0043] The ninth interface (41) and the sixth interface (32) are connected together through a connecting pipeline formed by a sixth pipeline (302) and a fifth pipeline (301), and a throttling element (1003) is provided at the connection of the two pipelines;

[0044] The eleventh interface (43) and the seventh interface (33) are connected together through a connecting pipeline formed by a seventh pipeline (303) and a sixth pipeline (302), and a fifth valve (1005) is provided at the connection between the two pipelines;

[0045] The tenth interface (42) and the thirteenth interface (51) are connected together via the eighth pipeline (401); the fourteenth interface (52) and the eighth interface (34) are connected together via a connecting pipeline formed by the tenth pipeline (501) and the eleventh pipeline (502), and a fourth valve (1004) is provided at the pipeline connection.

[0046] Among them, in a more preferred embodiment, the two sides of the first valve (1001) are respectively connected to a branch pipeline consisting of a nineteenth pipeline (902) and an eighteenth pipeline (901), and a ninth valve (1009) is arranged at the intersection of the two pipelines; and, a branch pipeline consisting of a seventeenth pipeline (802) and a sixteenth pipeline (801), an eighth valve (1008) is arranged at the connection of the two pipelines, and these two pipelines are respectively connected to the two ends of the fourth valve (1004).

[0047] like Figure 1 As 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).

[0048] The two ends of the second valve (1002) are respectively provided with a branch pipeline consisting of a thirteenth pipeline (602) and a twelfth pipeline (601), with a sixth valve (1006) arranged between the two; and a branch pipeline consisting of a fifteenth pipeline (702) and a fourteenth pipeline (701), with a seventh valve (1007) arranged between the two, and these two pipelines are respectively connected to the two ends of the fifth valve (1005).

[0049] like Figure 1As 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), 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).

[0050] 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 are formed as follows Figure 2 shown.

[0051] At this time, a low-temperature, low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature, high-pressure gaseous refrigerant in the compressor (1), and transported to the first heat exchanger (2). In the first heat exchanger (2), the high-temperature, high-pressure gaseous refrigerant is condensed into a medium-temperature, high-pressure liquid refrigerant. The medium-temperature, high-pressure liquid refrigerant continues to enter the second heat exchanger (3), and after the temperature of the heat exchange medium is increased in the second heat exchanger (3), it is reduced in pressure by the throttling element (1003) and enters the storage tank (4), 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, low-pressure liquid to become a low-temperature, low-pressure gas. The two-phase refrigerant is discharged and enters the storage tank (4). The gaseous refrigerant in the storage tank (4) continues to be sucked by the compressor (1), forming a cycle under heating. Among them, by recovering the waste heat of the medium-temperature and high-pressure liquid refrigerant, the temperature of the above-mentioned heat exchanger can be fully increased, thereby reducing the defrosting frequency or even eliminating defrosting, thereby reducing the ineffective power loss and improving system efficiency.

[0052] 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 related pipelines such as Figure 3 shown.

[0053] At this time, a low-temperature, low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature, high-pressure gaseous refrigerant in the compressor (1), and enters the second heat exchanger (3). In the second heat exchanger (3), the high-temperature, high-pressure gaseous refrigerant is condensed into a medium-temperature, high-pressure liquid refrigerant. After being discharged, it enters the second heat exchanger (3) again. The medium-temperature, high-pressure refrigerant is cooled again in the second heat exchanger (3), and after being reduced in pressure by the throttling element (1003), it enters the storage tank (4), and is sucked in by the circulating pump (5). After being pressurized by the circulating pump, it enters the first heat exchanger (2). Part of the refrigerant absorbs heat and evaporates from the low-temperature, low-pressure liquid to become a low-temperature, low-pressure gas. The two-phase refrigerant is discharged into the storage tank (4), and the gaseous refrigerant in the storage tank (4) is sucked in by the compressor (1) again, completing the system cycle in the refrigeration mode. In particular, by the function of the refrigerant flowing through the independent pipeline at the bottom of the heat exchanger (3), the refrigerant supply temperature can be reduced during summer refrigeration, thereby improving the system energy efficiency ratio.

[0054] 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 in the device. The equipment is highly integrated and occupies a small space. It does not need to occupy the original building, thereby reducing the building cost and improving the installation and construction efficiency.

[0055] In another embodiment, an energy storage solution may be optionally provided for cooling in summer and heating in winter. The system may be operated during off-peak hours when electricity prices are low, and only the circulation device may be operated during peak hours to reduce equipment operating costs.

[0056] In an embodiment, a single device of a modular device has a power of 6kw to 2000kw, which can adapt to a large terminal area.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circulating cooling and heating system, characterized in that: include: 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); 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 circulating pump absorbs heat and evaporates into a 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 circulating pump into a low-temperature and low-pressure gaseous refrigerant; Or, condensing the high-temperature and high-pressure gaseous refrigerant formed by the compressor into medium-temperature and high-pressure liquid refrigerant, and supercooling 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 arranged on some of the plurality of pipelines, and the switching between cooling and heating of the above-mentioned heating and cooling system is controlled by opening and closing some of the valves.

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 the liquid refrigerant is in full contact with the heat exchange surface, thereby achieving heat exchange between the liquid refrigerant and the heat exchange medium.

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 connected together through a third pipeline (201) and a fourth pipeline (202) respectively, and a second valve (1002) is provided at the connection point of the pipelines; The third interface (21) and the first interface (11) are connected together via a connecting pipeline formed by a second pipeline (102) and a first pipeline (101), and a first valve (1001) is provided at the connection point of the two pipelines; The second interface (12) and the twelfth interface (44) are connected together via a ninth pipeline (402); The ninth interface (41) and the sixth interface (32) are connected together through a connecting pipeline formed by a sixth pipeline (302) and a 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 via a connecting pipeline formed by a seventh pipeline (303) and a sixth pipeline (302), and a fifth valve (1005) is provided at the connection between the two pipelines; The tenth interface (42) and the thirteenth interface (51) are connected together via the eighth pipeline (401); the fourteenth interface (52) and the eighth interface (34) are connected together via a connecting pipeline formed by the tenth pipeline (501) and the eleventh pipeline (502), and a fourth valve (1004) is provided at the pipeline connection.

7. The circulating cooling and heating system according to claim 6, characterized in that: The first valve (1001) is respectively connected to two branch pipelines consisting of a nineteenth pipeline (902) and an eighteenth pipeline (901) on both sides, and a ninth valve (1009) is arranged at the intersection of the two pipelines; and a branch pipeline consisting of a seventeenth pipeline (802) and a sixteenth pipeline (801), and an eighth valve (1008) is arranged at the connection of the two pipelines, and these two pipelines are respectively connected to two ends of the fourth valve (1004).

8. The circulating cooling and heating system according to claim 7, characterized in that: The two ends of the second valve (1002) are respectively provided with a branch pipeline consisting of a thirteenth pipeline (602) and a twelfth pipeline (601), with a sixth valve (1006) arranged between the two; and a branch pipeline consisting of a fifteenth pipeline (702) and a fourteenth pipeline (701), with a seventh valve (1007) arranged between the two, and these two pipelines are respectively connected to the two ends of the fifth valve (1005).

9. The circulating cooling and heating system according to claim 8, characterized in that: 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, low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature, high-pressure gaseous refrigerant in the compressor (1), and transported to the first heat exchanger (2), where the high-temperature, high-pressure gaseous refrigerant is condensed into a medium-temperature, high-pressure liquid The medium-temperature and high-pressure liquid refrigerant continues to enter the second heat exchanger (3), and after the temperature of the heat exchange medium is increased in the second heat exchanger (3), it is reduced in pressure by the throttling element (1003) and enters the storage tank (4), and is continuously sucked in by the circulating pump (5). After being pressurized by the circulating 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 to become 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) continues to be sucked in by the compressor (1), forming a cycle under heating.

10. The circulating cooling and heating system according to claim 8, characterized in that: 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; a low-temperature, low-pressure gaseous refrigerant is sucked into the compressor (1), compressed into a high-temperature, high-pressure gaseous refrigerant in the compressor (1), and enters the second heat exchanger (3), where the high-temperature, high-pressure gaseous refrigerant is condensed into After being discharged, the medium-temperature and high-pressure liquid refrigerant enters the second heat exchanger (3) again, where it is cooled again, and after being reduced in pressure by the throttling element (1003), it enters the storage tank (4), and is sucked in by the circulating pump (5). After being pressurized by the circulating pump, it enters the first heat exchanger (2), where part of the refrigerant absorbs heat and evaporates from the low-temperature and low-pressure liquid to become a low-temperature and low-pressure gas. The two-phase refrigerant is discharged into the storage tank (4), and the gaseous refrigerant in the storage tank (4) is sucked in by the compressor (1), completing the system cycle in the refrigeration mode.

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