CN214581896U - Single-stage, overlapping circulation free conversion heat pump system - Google Patents

Single-stage, overlapping circulation free conversion heat pump system Download PDF

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Publication number
CN214581896U
CN214581896U CN202023281441.3U CN202023281441U CN214581896U CN 214581896 U CN214581896 U CN 214581896U CN 202023281441 U CN202023281441 U CN 202023281441U CN 214581896 U CN214581896 U CN 214581896U
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stage
pipe
heat exchanger
unit module
cascade
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石文星
肖寒松
杨子旭
李无言
王宝龙
李先庭
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Tsinghua University
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Tsinghua University
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Abstract

The utility model provides a heat pump system with free conversion of single-stage and overlapping circulation, which comprises a first single-stage circulation system, a second single-stage circulation system and an intermediate heat exchanger system, wherein the first single-stage circulation system comprises a first outdoor unit module and at least one first indoor unit module; the second single-stage circulating system comprises a second outdoor unit module and at least one second indoor unit module; the intermediate heat exchanger system is respectively connected with the first single-stage circulating system and the second single-stage circulating system; the first single-stage circulating system, the second single-stage circulating system and the intermediate heat exchanger system are combined into a cascade circulating system, and in the cascade circulating system, the first single-stage circulating system or the second single-stage circulating system can be used as one side of a high-temperature stage. The utility model discloses in, this system can high-efficiently satisfy the hot demand of different temperature grades.

Description

Single-stage, overlapping circulation free conversion heat pump system
Technical Field
The utility model relates to a refrigeration heat pump technical field especially relates to a heat pump system of single-stage, overlapping circulation free conversion.
Background
The heat pump is used as an important heating and refrigerating device, has the advantages of high efficiency, energy conservation, safety and reliability, and plays an important role in heating of civil buildings, domestic hot water and hot air and hot water preparation in industrial processes. For a heat pump system with a large temperature difference between a heat source side and a use side, such as a low-temperature heat pump system running in a low-temperature environment or an industrial heat pump needing to prepare high-temperature hot air and hot water, the common single-stage compression circulation system is difficult to adapt to a high-pressure ratio, so that the heating capacity is reduced and the energy efficiency ratio is reduced; and the adoption of a multi-stage compression system is limited by the performance of the refrigerant, the pressure-bearing capacity of a unit and the like. Therefore, for the low-temperature heat pump and the industrial heat pump which need to adapt to the large pressure ratio, the performance of the heat pump product is effectively improved by adopting the cascade cycle. The cascade cycle can divide the larger total temperature difference into two or more sections, select proper refrigerant cycle according to the temperature zone of each section, and then superpose them, so that the pressure ratio between the two ends of the heat source side and the use side can be reduced, and the operation performance of each section can be improved.
Taking an industrial high-temperature heat pump as an example, because industrial loads are often changed, different products have different requirements on corresponding process temperatures, and the requirement of temperature change cannot be met simultaneously by adopting a single-stage compression system and a cascade system. In addition, for low-temperature air source heat pumps for producing normal-temperature hot water and wind in cold and severe cold areas in the north of China, the requirements of different terminal temperatures, such as different requirements of heating and domestic hot water and the condition of temperature change at the outdoor heat source side, can not be met by adopting a single-stage compression system and a cascade system. The multi-connected heat pump system only needs one host, can convey the refrigerant to a plurality of tail ends so as to meet the tail end requirement of a plurality of use sides, and has the advantages of energy conservation, intelligent regulation and control and different tail end control.
In order to meet different temperature requirements, adapt to a large pressure ratio range and simultaneously meet different terminal differences, for example, the heat supply terminal temperature of the heat pump in winter is lower, the temperature difference is smaller and the pressure ratio is low; when the domestic hot water is prepared, the temperature of the hot water is high, the heating requirement of high pressure ratio needs to be met, and the temperature required by different users and terminals is different. Therefore, there is a need to develop a high-efficiency variable-temperature multi-connection heat pump system which can satisfy the large temperature difference between the heat source side and the use side and can meet the pressure ratio requirements of different use sides.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a heat pump system of single-stage, overlapping circulation free conversion for solve among the prior art the unable end that adapts to different heat temperatures of heat pump system.
The embodiment of the utility model provides a heat pump system of single-stage, overlapping circulation free conversion, include:
the first single-stage circulating system comprises a first outdoor unit module and at least one first indoor unit module;
the second single-stage circulating system comprises a second outdoor unit module and at least one second indoor unit module;
the intermediate heat exchanger system is respectively connected with the first single-stage circulating system and the second single-stage circulating system; wherein the content of the first and second substances,
the first single-stage circulation system and the second single-stage circulation system can operate independently or can be combined with the intermediate heat exchanger system to form a cascade circulation system, and in the cascade circulation system, the first single-stage circulation system or the second single-stage circulation system can be used as one side of a high-temperature stage.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the intermediate heat exchange system comprises an evaporative condenser, and a first pipe body, a second pipe body, a third pipe body and a fourth pipe body which are connected with the evaporative condenser;
the opposite sides of the first outdoor unit module and the first indoor unit module are connected with the first pipe and the third pipe;
the second outdoor unit module and the second indoor unit module are connected with the second pipe body and the fourth pipe body at two opposite sides.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the first indoor unit module comprises a first indoor heat exchanger and a first throttling device which is connected with the first indoor heat exchanger and communicated with the third pipe body;
the second indoor unit module comprises a second indoor heat exchanger and a second throttling device which is connected with the second indoor heat exchanger and communicated with the fourth pipe.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the first outdoor unit module comprises a third throttling device, a first outdoor heat exchanger, a first four-way reversing valve, a first compressor and a first gas-liquid separation device, wherein the first outdoor heat exchanger, the first four-way reversing valve and the first compressor are connected with the third throttling device;
the second outdoor unit module comprises a fourth throttling device, a second outdoor heat exchanger, a second four-way reversing valve, a second compressor and a second gas-liquid separation device, wherein the second outdoor heat exchanger, the second four-way reversing valve, the second compressor and the second gas-liquid separation device are connected with the fourth throttling device.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the first pipe body comprises a first through pipe, a second through pipe, a third through pipe and a fourth through pipe;
the air of the first flow pipe flows to the intermediate heat exchanger system from the first indoor unit module, and the second flow pipe is connected with the first flow pipe and flows through the first four-way reversing valve and the first gas-liquid separation device; the third flow pipe is connected with the second flow pipe and flows to the first outdoor heat exchanger and the third throttling device; the fourth circulation pipe is connected with the second circulation pipe and the third circulation pipe and flows to the intermediate heat exchanger system;
the second pipe body comprises a fifth circulating pipe, a sixth circulating pipe, a seventh circulating pipe and an eighth circulating pipe;
the air of the fifth circulating pipe flows to the intermediate heat exchanger system from the second indoor unit module, and the sixth circulating pipe is connected with the fifth circulating pipe and flows through the second four-way reversing valve and the second gas-liquid separation device; the seventh circulating pipe is connected with the sixth circulating pipe and flows to the second outdoor heat exchanger and the fourth throttling device; the eighth flow pipe is connected to the sixth flow pipe and the seventh flow pipe and flows to the intermediate heat exchanger system.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the middle heat exchanger system also comprises a fifth throttling device, a sixth throttling device, a third four-way reversing valve and a fourth four-way reversing valve;
the fifth throttling device is arranged on the third pipe body, and the third four-way reversing valve is respectively connected with the first circulating pipe and the fourth circulating pipe;
the sixth throttling device is arranged on the fourth pipe body, and the fourth four-way reversing valve is connected with the fifth circulating pipe and the eighth circulating pipe respectively.
According to the heat pump system with free conversion of single-stage and cascade circulation of the utility model,
the first single-stage circulating system further comprises a first defrosting channel, and the first defrosting channel is respectively connected with the second flow pipe and the outlet side of the first outdoor heat exchanger;
the second single-stage circulation system further includes a second defrosting passage that is connected to the sixth circulation pipe and an outlet side of the second outdoor heat exchanger, respectively.
According to the utility model discloses a single-stage, overlapping circulation heat pump system of free conversion of embodiment in overlapping circulation system, first single-stage circulation system perhaps second single-stage circulation system all can be high temperature side or low temperature side.
According to the utility model discloses a single-stage, overlapping circulation heat pump system of free conversion, among the overlapping circulation system, high temperature level one side is used for maintaining to be higher than first single-stage circulation system perhaps the second single-stage circulation system maintains the condensation temperature when alone operating.
According to the utility model discloses a heat pump system of single-stage, the free conversion of overlapping circulation, in the overlapping circulation system, the evaporative condenser includes evaporation side and condensation side; the evaporation side or the condensation side respectively corresponds to an evaporation end and a condensation end in the first single-stage circulation system or the second single-stage circulation system.
The utility model provides a single-stage, overlapping circulation heat pump system of free conversion, including first single-stage circulation system, second single-stage circulation system and middle heat exchanger system, and then first single-stage circulation system and second single-stage circulation system all can work alone and refrigerate or heat, and when first single-stage circulation system, second single-stage circulation system and middle heat exchanger system form overlapping circulation system jointly, first single-stage circulation system or second single-stage circulation system all can regard as the high temperature side, can adapt to the heat demand of different temperature grades from this.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a single-stage, overlapping cycle free-switching heat pump system of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a single-stage, overlapping cycle, free-switching heat pump system of the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of a single-stage, overlapping cycle free-switching heat pump system according to the present invention;
reference numerals:
10: a first single-stage circulation system; 110: a first outdoor unit module; 1110: a third throttling means;
1120: a first outdoor heat exchanger; 1130: a first four-way reversing valve; 1140: a first compressor;
1150: a first gas-liquid separation device;
120: a first indoor unit module; 1210: a first indoor heat exchanger;
1220: a first throttling device; 130: a first defrost channel; 20: a second single-stage circulation system;
210: a second outdoor unit module; 2110: a fourth throttling device; 2120: a second outdoor heat exchanger;
2150: a second gas-liquid separation device;
2130: a second four-way reversing valve; 2140: a second compressor;
220: a second indoor unit module; 2210: a second indoor heat exchanger; 2220: a second throttling device;
230: a second defrost channel; 30: an intermediate heat exchanger system; 310: an evaporative condenser;
3110: an evaporation side; 3120: a condensing side; 320: a first pipe body;
3210: a first flow pipe; 3220: a second flow pipe; 3230: a third flow pipe;
3240: a fourth flow-through pipe; 330: a second tube body; 3310: a fifth flow-through pipe;
3320: a sixth flow-through pipe; 3330: a seventh flow-through pipe; 3340: an eighth flow-through pipe;
340: a third tube; 350: a fourth tube body; 360: a fifth throttling device;
370: a sixth throttling means; 380: a third four-way reversing valve; 390: a fourth four-way reversing valve;
40: and a defrosting valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring now to fig. 1 and 3, the present invention provides a single-stage, overlapping cycle free-switching heat pump system, which includes a first single-stage cycle system 10 and a second single-stage cycle system 20
The intermediate heat exchanger system 30, the first single-stage circulating system 10, includes a first outdoor unit module 110 and at least one first indoor unit module 120; a second single-stage circulation system 20 including a second outdoor unit module 210 and at least one second indoor unit module 220; an intermediate heat exchanger system 30 connected to the first single-stage circulation system 10 and the second single-stage circulation system 20, respectively; the first single-stage circulation system 10 and the second single-stage circulation system 20 may operate independently or may be combined with the intermediate heat exchanger system 30 to form a cascade circulation system, and in the cascade circulation system, the first single-stage circulation system 10 or the second single-stage circulation system 20 may be used as a high-temperature stage side. That is, in the state where the first single-stage circulation system 10 or the second single-stage circulation system 20 operates alone, the temperature of the room temperature maintained by the first indoor unit module 120 or the second indoor unit module 220 alone is lower than the temperature of the room temperature maintained by the first indoor unit module 120 or the second indoor unit module 220 in the tandem circulation system. It should be noted that, when the first single-stage circulation system 10 or the second single-stage circulation system 20 is operated alone, the first single-stage circulation system 10 or the second single-stage circulation system 20 may respectively generate heat or cool. When the first single-stage circulation system 10, the second single-stage circulation system 20, and the intermediate heat exchanger system 30 are combined into a cascade circulation system, the first single-stage circulation system 10 or the second single-stage circulation system 20 may be a high-temperature stage, and taking the first single-stage circulation system 10 as the high-temperature stage as an example, the temperature of the room temperature maintained by the first indoor unit module 120 of the first single-stage circulation system 10 is higher than the temperature of the room temperature maintained by the first single-stage circulation system 10 when it operates alone. Therefore, when the cascade circulation system operates, the system can provide high-temperature hot water for users so as to meet the heat requirements of different grades. Specifically, fig. 1 is a schematic structural diagram of an embodiment of a single-stage, overlapping cycle free-switching heat pump system according to the present invention; FIG. 2 is a schematic structural diagram of another embodiment of a single-stage, overlapping cycle, free-switching heat pump system of the present invention; fig. 3 is a schematic structural diagram of a third embodiment of the single-stage, overlapping cycle free-switching heat pump system of the present invention. It should be noted that fig. 2 and fig. 3 are both modifications made on the basis of fig. 1, a defrosting channel is added on the basis of fig. 1 in fig. 2, and a plurality of four-way reversing valves are added on the basis of fig. 1 in fig. 3, so that the first single-stage circulation system 10 and the second single-stage circulation system 20 can be combined into a cascade circulation system to further meet the heat demands of different grades.
The intermediate heat exchange system comprises an evaporative condenser 310, a first pipe 320, a second pipe 330, a third pipe 340 and a fourth pipe 350 which are connected with the evaporative condenser 310; opposite sides of the first outdoor unit module 110 and the first indoor unit module 120 are connected to the first pipe 320 and the third pipe 340; the second outdoor unit module 210 and the second indoor unit module 220 are connected to the second pipe 330 and the fourth pipe 350 at opposite sides thereof.
For the first single-stage circulation system 10, the first indoor unit module 120 includes a first indoor heat exchanger 1210 and a first throttling device 1220 connected to the first indoor heat exchanger 1210 and communicated with the third pipe 340. The first outdoor unit module 110 includes a third throttling device 1110, a first outdoor heat exchanger 1120 connected to the third throttling device 1110, a first four-way reversing valve 1130, a first compressor 1140, and a first gas-liquid separating device 1150 connected to the first compressor 1140. The first pipe 320 includes a first flow pipe 3210, a second flow pipe 3220, a third flow pipe 3230, and a fourth flow pipe 3240. The air in the first flow pipe 3210 flows from the first indoor unit module 120 to the intermediate heat exchanger system 30, and the second flow pipe 3220 is connected to the first flow pipe 3210 and flows through the first four-way reversing valve 1130 and the first gas-liquid separating device 1150; the third flow pipe 3230 is connected to the second flow pipe 3220 and flows to the first outdoor heat exchanger 1120 and the third throttling device 1110; the fourth flow tube 3240 is connected to the second and third flow tubes 3220 and 3230 and flows to the intermediate heat exchanger system 30.
For the second single-stage circulation system 20, the second indoor unit module 220 includes a second indoor heat exchanger 2210 and a second throttling device 2220 connected to the second indoor heat exchanger 2210 and communicating with the fourth pipe 350. The second outdoor unit module 210 includes a fourth throttling device 2110, a second outdoor heat exchanger 2120 connected to the fourth throttling device 2110, a second four-way selector valve 2130, a second compressor 2140, and a second gas-liquid separator 2150 connected to a tank of the second compressor 2140. The second pipe 330 includes a fifth flow pipe 3310, a sixth flow pipe 3320, a seventh flow pipe 3330, and an eighth flow pipe 3340; the gas in the fifth flow pipe 3310 flows from the second indoor unit module 220 to the intermediate heat exchanger system 30, and the sixth flow pipe 3320 is connected to the fifth flow pipe 3310 and flows through the second four-way selector valve 2130 and the second gas-liquid separator 2150; the seventh circulation pipe 3330 is connected to the sixth circulation pipe 3320 and flows to the second outdoor heat exchanger 2120 and the fourth throttling device 2110; the eighth flow conduit 3340 is connected to the sixth flow conduit 3320 and the seventh flow conduit 3330 and flows to the intermediate heat exchanger system 30.
Further, the intermediate heat exchanger system 30 further includes a fifth throttle device 360, a sixth throttle device 370, a third four-way reversing valve 380, and a fourth four-way reversing valve 390; the fifth throttling device 360 is arranged on the third pipe 340, and the third four-way reversing valve 380 is respectively connected with the first circulation pipe 3210 and the fourth circulation pipe 3240; the sixth throttling means 370 is provided in the fourth pipe body 350, and the fourth four-way selector valve 390 is connected to the fifth flow pipe 3310 and the eighth flow pipe 3340, respectively.
In addition, the first single-stage circulation system 10 further includes a first defrost channel 130, and the first defrost channel 130 is connected to the second flow pipe 3220 and the outlet side of the first outdoor heat exchanger 1120, respectively; the second single-stage circulation system 20 further includes a second defrost passage 230, and the second defrost passage 230 is connected to the sixth circulation pipe 3320 and the outlet side of the second outdoor heat exchanger 2120, respectively.
The first four-way reversing valve 1130S side is communicated with an inlet of the first gas-liquid separating device 1150, the first four-way reversing valve 1130D side is communicated with an outlet of the first compressor 1140, the first four-way reversing valve 1130C side is communicated with an inlet of the first outdoor heat exchanger 1120, and the first four-way reversing valve 1130E side is communicated with an inlet of the first indoor unit module 120. The second four-way reversing valve 2130S side is communicated with the inlet of the second gas-liquid separation device 2150, the second four-way reversing valve 2130D side is communicated with the outlet of the second compressor 2140, the second four-way reversing valve 2130E side is communicated with the inlet of the second indoor unit module 220, and the second four-way reversing valve 2130C side is communicated with the inlet of the second outdoor heat exchanger 2120. The third four-way reversing valve 380S is connected to the outlet side of the first compressor 1140, the third four-way reversing valve 380C is closed, the third four-way reversing valve 380E is connected to the evaporative condenser 310, and the third four-way reversing valve 380D is connected to the first indoor unit module 120. The fourth four-way reversing valve 390S side is communicated with the outlet side of the second compressor 2140, the fourth four-way reversing valve 390C side is closed, the fourth four-way reversing valve 390E side is connected with the evaporative condenser 310, and the fourth four-way reversing valve 390D side is connected with the second indoor unit module 220.
In an embodiment of the present invention, the first single-stage circulation system 10 or the second single-stage circulation system 20 can both refrigerate. Here, the first single-stage circulation system 10 is taken as an example: referring to fig. 1, the first four-way reversing valve 1130E is connected to the first four-way reversing valve 1130S, the first four-way reversing valve 1130D is connected to the first four-way reversing valve 1130C, and the third throttling device 1110 is opened. In the intermediate heat exchanger system 30, the third four-way selector valve 380S is connected to the third four-way selector valve 380C, the third four-way selector valve 380E is connected to the third four-way selector valve 380D, the fourth four-way selector valve 390S is connected to the fourth four-way selector valve 390C, and the fourth four-way selector valve 390E is connected to the fourth four-way selector valve 390D. Evaporative condenser 310 is turned off. In the first single-stage cycle system 10, the refrigerator completes a single-stage compression cycle through the first compressor 1140, the first four-way reversing valve 1130, the first outdoor heat exchanger 1120, the third throttling device 1110, the first throttling device 1220, the first indoor heat exchanger 1210, and the first gas-liquid separating device 1150. The first indoor unit module 120 of the first single-stage circulation system 10 serves as an evaporator to supply a cooling capacity to the room for cooling.
Either the first single stage cycle system 10 or the second single stage cycle system 20 may also produce heat. Here, the first single-stage circulation system 10 is taken as an example: the first four-way reversing valve 1130D is connected to the first four-way reversing valve 1130E, and the first four-way reversing valve 1130S is connected to the first four-way reversing valve 1130C. The third throttling means 1110 is opened. In the intermediate heat exchanger system 30, the third four-way reversing valve 380D side is connected with the third four-way reversing valve 380C side, and the third four-way reversing valve 380E side is communicated with the third four-way reversing valve 380S side; the fourth four-way reversing valve 390D is connected to the fourth four-way reversing valve 390C, and the fourth four-way reversing valve 390E is connected to the fourth four-way reversing valve 390S. The fifth and sixth throttle devices 360 and 370 are closed and the evaporative condenser 310 is closed. For the first single-stage circulation system 10, the refrigerator sequentially passes through the first compressor 1140, the first four-way reversing valve 1130, the first indoor heat exchanger 1210, the first throttling device 1220, the third throttling device 1110, the first outdoor heat exchanger 1120, the first four-way reversing valve 1130, and the first gas-liquid separation device 1150 to complete a single-stage compression cycle. The first indoor unit module 120 of the first single-stage circulation system 10 serves as a condenser to supply heating power to the room to generate heat.
When the cascade cycle system is operated, both the first single-stage cycle system 10 and the second single-stage cycle system 20 may be used as a low temperature stage or a high temperature stage. With reference to fig. 1, the first single-stage circulation system 10 is taken as an example of a high-temperature stage: the first four-way selector valve 1130D is connected to the first four-way selector valve 1130E, the first four-way selector valve 1130C is connected to the first four-way selector valve 1130S, and the third throttling device 1110 is closed. In the intermediate heat exchanger system 30, the third four-way selector valve 380D is connected to the third four-way selector valve 380C, the third four-way selector valve 380E is connected to the third four-way selector valve 380S, the fourth four-way selector valve 390D is connected to the fourth four-way selector valve 390E, the fourth four-way selector valve 390C is connected to the fourth four-way selector valve 390S, and the fifth throttle device 360 and the sixth throttle device 370 are connected. In the second single-stage cycle system 20, the second four-way selector valve 2130E is connected to the second four-way selector valve 2130D, and the second four-way selector valve 2130C is connected to the second four-way selector valve 2130S. The fourth throttle device 2110 is opened, and the second indoor unit module 220 is completely closed. For high temperature stage operation of the first single stage cycle system 10, the first indoor unit module 120 releases heat to the environment and the evaporative condenser 310 acts as an evaporator of the first single stage cycle system 10. The second single-stage circulation system 20 operates as a low-temperature machine, the evaporative condenser 310 serves as a condenser of the second single-stage circulation system 20, and the second outdoor heat exchanger 2120 serves as an evaporator of the second single-stage circulation system 20. In the cascade cycle system, the evaporative condenser 310 includes an evaporative side 3110 and a condensation side 3120, that is, referring to fig. 3 in particular, when the first single-stage cycle system 10 is a low temperature side, a side of the evaporative condenser 310 close to the first single-stage cycle system 10 is the condensation side 3120, which also corresponds to the evaporative condenser 310 being a condenser in the first single-stage cycle system 10 and an evaporator in the second single-stage cycle system 20. The evaporative condenser 310 is an evaporative side 3110 on the side near the second single-stage circulation system 20. It should be noted that, similarly, when the second single-stage circulation system 20 is at the low temperature side, the evaporation side 3110 and the condensation side 3120 are disposed at opposite positions to those when the first single-stage circulation system 10 is at the low temperature side, and will not be described herein.
Further, please refer to fig. 2 and fig. 3, the present invention further provides a hot gas bypass defrosting mode, when the first outdoor heat exchanger 1120 of the first single-stage circulating system 10 or the second outdoor heat exchanger 2120 of the second single-stage circulating system 20 frosts, the hot gas bypass defrosting mode can be adopted to defrost. Taking the first single-stage circulation system 10 as an example, when the first outdoor heat exchanger 1120 frosts, the defrosting valve 40 and the third throttling device 1110 are opened, and the high-temperature exhaust gas enters the first outdoor heat exchanger 1120 from the first compressor 1140 through the defrosting valve 40 and the defrosting pipeline for defrosting, and then returns to the first compressor 1140 through the first gas-liquid separation device 1150.
In another embodiment, the first and second indoor heat exchangers 1210 and 2210 employ refrigerant-water heat exchangers, and a water side is connected with a heat consumer through a water separator, a water collector, and a water pump to deliver high temperature hot water to the heat consumer.
In summary, when the first single-stage circulation system 10 and the second single-stage circulation system 20 are operated individually, cold water or low-temperature hot water can be provided to the user, that is, in the cascade circulation system, the high-temperature stage side is used to maintain a higher condensation temperature than that maintained when the first single-stage circulation system 10 or the second single-stage circulation system 20 is operated individually, so that in the cascade circulation system, the system can provide hot water with a higher temperature to the user than that generated when the first single-stage circulation system 10 or the second single-stage circulation system 20 is operated individually, and the first single-stage circulation system 10 or the second single-stage circulation system 20 can be operated individually, and a plurality of systems are switched to meet different grade heat demands.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A single-stage, cascade cycle, free-switching heat pump system comprising:
the first single-stage circulating system comprises a first outdoor unit module and at least one first indoor unit module;
the second single-stage circulating system comprises a second outdoor unit module and at least one second indoor unit module;
the intermediate heat exchanger system is respectively connected with the first single-stage circulating system and the second single-stage circulating system; wherein the content of the first and second substances,
the first single-stage circulation system and the second single-stage circulation system can operate independently or can be combined with the intermediate heat exchanger system to form a cascade circulation system, and in the cascade circulation system, the first single-stage circulation system or the second single-stage circulation system can be used as one side of a high-temperature stage.
2. The single-stage, cascade cycle free-transfer heat pump system of claim 1 wherein the intermediate heat exchanger system comprises an evaporative condenser, a first tube, a second tube, a third tube, and a fourth tube connected to the evaporative condenser;
the opposite sides of the first outdoor unit module and the first indoor unit module are connected with the first pipe and the third pipe;
the second outdoor unit module and the second indoor unit module are connected with the second pipe body and the fourth pipe body at two opposite sides.
3. The single-stage, cascade cycle free-transfer heat pump system of claim 2 wherein the first indoor unit module comprises a first indoor heat exchanger and a first throttle device connected to the first indoor heat exchanger and in communication with the third tube;
the second indoor unit module comprises a second indoor heat exchanger and a second throttling device which is connected with the second indoor heat exchanger and communicated with the fourth pipe.
4. The single-stage, cascade cycle free-switching heat pump system of claim 3, wherein the first outdoor unit module comprises a third throttling device, a first outdoor heat exchanger connected to the third throttling device, a first four-way reversing valve, a first compressor, and a first gas-liquid separating device connected to the first compressor;
the second outdoor unit module comprises a fourth throttling device, a second outdoor heat exchanger, a second four-way reversing valve, a second compressor and a second gas-liquid separation device, wherein the second outdoor heat exchanger, the second four-way reversing valve, the second compressor and the second gas-liquid separation device are connected with the fourth throttling device.
5. The single-stage, cascade cycle free-transfer heat pump system of claim 4 wherein the first tube comprises a first flow tube, a second flow tube, a third flow tube, and a fourth flow tube;
the air of the first flow pipe flows to the intermediate heat exchanger system from the first indoor unit module, and the second flow pipe is connected with the first flow pipe and flows through the first four-way reversing valve and the first gas-liquid separation device; the third flow pipe is connected with the second flow pipe and flows to the first outdoor heat exchanger and the third throttling device; the fourth circulation pipe is connected with the second circulation pipe and the third circulation pipe and flows to the intermediate heat exchanger system;
the second pipe body comprises a fifth circulating pipe, a sixth circulating pipe, a seventh circulating pipe and an eighth circulating pipe;
the air of the fifth circulating pipe flows to the intermediate heat exchanger system from the second indoor unit module, and the sixth circulating pipe is connected with the fifth circulating pipe and flows through the second four-way reversing valve and the second gas-liquid separation device; the seventh circulating pipe is connected with the sixth circulating pipe and flows to the second outdoor heat exchanger and the fourth throttling device; the eighth flow pipe is connected to the sixth flow pipe and the seventh flow pipe and flows to the intermediate heat exchanger system.
6. The single-stage, cascade cycle free-transfer heat pump system of claim 5 wherein the intermediate heat exchanger system further comprises a fifth throttle device, a sixth throttle device, a third four-way reversing valve, and a fourth four-way reversing valve;
the fifth throttling device is arranged on the third pipe body, and the third four-way reversing valve is respectively connected with the first circulating pipe and the fourth circulating pipe;
the sixth throttling device is arranged on the fourth pipe body, and the fourth four-way reversing valve is connected with the fifth circulating pipe and the eighth circulating pipe respectively.
7. The single-stage, cascade cycle free-transfer heat pump system of claim 6 wherein the first single-stage cycle system further comprises a first defrost channel connecting the second flow line and the outlet side of the first outdoor heat exchanger, respectively;
the second single-stage circulation system further includes a second defrosting passage that is connected to the sixth circulation pipe and an outlet side of the second outdoor heat exchanger, respectively.
8. The single stage, cascade cycle, free-wheeling heat pump system of claim 7 wherein in the cascade cycle system, either the first single stage cycle system or the second single stage cycle system can be either a high temperature side or a low temperature side.
9. The single-stage, cascade-cycle, free-wheeling heat pump system of claim 2 wherein the high temperature stage side is used to maintain a higher condensing temperature than would be maintained if either the first single-stage cycle system or the second single-stage cycle system were operated alone in the cascade cycle system.
10. The single-stage, cascade-cycle, free-wheeling heat pump system of claim 2 wherein the evaporative condenser comprises an evaporation side and a condensation side in the cascade cycle system; the evaporation side or the condensation side respectively corresponds to an evaporation end and a condensation end in the first single-stage circulation system or the second single-stage circulation system.
CN202023281441.3U 2020-12-29 2020-12-29 Single-stage, overlapping circulation free conversion heat pump system Active CN214581896U (en)

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Application Number Priority Date Filing Date Title
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CN214581896U true CN214581896U (en) 2021-11-02

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