CN106500393B - Multi-split heat pump system with three-stage centrifugal compressor - Google Patents
Multi-split heat pump system with three-stage centrifugal compressor Download PDFInfo
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- CN106500393B CN106500393B CN201610990125.2A CN201610990125A CN106500393B CN 106500393 B CN106500393 B CN 106500393B CN 201610990125 A CN201610990125 A CN 201610990125A CN 106500393 B CN106500393 B CN 106500393B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a multi-split air-conditioning heat pump system with a three-stage centrifugal compressor, which comprises a compressor, a four-way valve, a gas-liquid separator, a condenser, an air pipe stop valve, an oil separator, a main electronic expansion valve, a liquid pipe stop valve and an evaporator, wherein the compressor comprises a first-stage compression cavity, a second-stage compression cavity and a three-stage compression cavity which are sequentially connected, an air inlet of the first-stage compression cavity is connected with an air outlet of the gas-liquid separator, the air outlet of the first-stage compression cavity is connected with a first three-way valve, the other two ends of the first three-way valve are respectively connected with the air inlet and the air outlet of the second-stage compression cavity, the air outlet of the second three-way valve is also connected with a second three-way valve, and the other end of the second three-stage compression cavity is respectively connected with the air inlet and the air outlet of the three-stage compression cavity. The heat pump system can meet the performance requirements of the system under different loads, and the system efficiency under partial loads is high.
Description
Technical Field
The invention relates to a heat pump system, in particular to a multi-split heat pump system with three-stage centrifugal compressors. .
Background
The existing multi-split heat pump system field mostly adopts a vortex compressor, particularly under the working condition of low temperature environment, the compressor efficiency is lower, and the centrifugal compressor is mostly used for a large-scale water chiller system, and although the efficiency is higher than that of the vortex compressor, the centrifugal compressor cannot be used for a small-cooling-capacity multi-split system due to the limitation of the size and the pressure ratio, and cannot be well converted and applied to the multi-split system. The heating quantity and the heating efficiency of the multi-split heat pump are continuously reduced along with the reduction of the ambient temperature, and the demand of people for the heating quantity is continuously increased along with the reduction of the ambient temperature. The main technical reason is that when the scroll compressor adopted by the common air source heat pump works in a low-temperature environment, the exhaust temperature of the compressor exceeds the allowable working range of the compressor, the compressor is frequently started and stopped and cannot work normally, when the environment temperature is reduced below 5 ℃, the surface of the evaporator is frosted, so that the heat exchange coefficient is reduced, and the heat pump system needs to be continuously frosted to ensure the normal operation of the system, so that the comfort of a user is greatly reduced. In addition, in order to absorb heat from outdoor air, the evaporation temperature of the heat pump is reduced to the minimum, at this time, the suction specific volume of the compressor is increased, the system refrigerant circulation amount is reduced, the pressure ratio of the compressor is increased, the volumetric efficiency is reduced, and the heating capacity and COP of the heat pump system are greatly reduced. Increasing the heating capacity of an air source heat pump under a low-temperature working condition has been a problem to be solved by the air conditioner.
In order to improve the heating capacity of the multi-split system under the low-temperature working condition, air-conditioning heat pump researchers do a lot of work, industry enterprises in recent years sequentially push out the low-temperature strong-heating multi-split system, a quasi two-stage compression system is mostly adopted, and a real two-stage compressor multi-split system is also pushed out by adding an auxiliary module. However, because the two-stage compression modules of the system are independently arranged, the system needs to be connected with the host module through a pipeline during field installation, so that the occupied area is increased, the installation difficulty is increased, the system cannot realize that a plurality of external machines with large numbers are connected in parallel, and the requirement of larger load cannot be met.
Disclosure of Invention
The invention provides a multi-split heat pump system with three-stage centrifugal compressors, which aims to solve a series of problems that a multi-stage compression module of the existing multi-split heat pump system is independently arranged, needs to be connected with a host module through a pipeline during field installation, has the advantages of large occupied area, high installation difficulty and the like, and can solve the problems.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
a multi-split heat pump system with three-stage centrifugal compressor comprises a compressor, a four-way valve, a gas-liquid separator connected with the s end of the four-way valve, a condenser connected with the c end of the four-way valve, an air pipe stop valve connected with the e end of the four-way valve, an oil separator connected with the d end of the four-way valve, a main electronic expansion valve connected with the condenser, a liquid pipe stop valve connected with the main electronic expansion valve, and an evaporator with two ends respectively connected with the air pipe stop valve and the liquid pipe stop valve, wherein the compressor comprises a first-stage compression cavity, a second-stage compression cavity and a third-stage compression cavity which are sequentially connected, an air inlet of the first-stage compression cavity is connected with an air outlet of the gas-liquid separator, the other two ends of the first-stage compression cavity are respectively connected with an air inlet and an air outlet of the second-stage compression cavity, the air outlet of the second-stage compression cavity is also connected with a second-stage three-way valve, and the other end of the second-stage three-stage valve is respectively connected with the air inlet of the third-stage compression cavity and the air outlet of the third-stage compression cavity.
Further, the multi-split heat pump system further comprises a first plate heat exchanger, the first plate heat exchanger comprises a first heat exchange channel and a first air supplementing channel, the first heat exchange channel is connected between the main electronic expansion valve and the liquid pipe stop valve, one end of the first air supplementing channel is connected with the main electronic expansion valve through the first electronic expansion valve, and the other end of the first air supplementing channel is connected with the air inlet of the secondary compression cavity.
Further, the multi-split heat pump system further comprises a second plate heat exchanger, the second plate heat exchanger comprises a second heat exchange channel and a second air supplementing channel, one end of the second heat exchange channel is connected with the first heat exchange channel, the other end of the second heat exchange channel is connected with the liquid pipe stop valve, one end of the second air supplementing channel is connected with the first heat exchange channel through a second electronic expansion valve, and the other end of the second air supplementing channel is connected with an air inlet of the three-stage compression cavity.
Further, the compressor is a centrifugal compressor, impellers are respectively arranged in the primary compression cavity, the secondary compression cavity and the tertiary compression cavity, and the sizes of the impellers in the primary compression cavity, the secondary compression cavity and the tertiary compression cavity are sequentially increased.
Further, the output end of the condenser is also connected with the input end of the gas-liquid separator through a passage, and a liquid spraying valve is arranged on the passage.
Further, the output end of the oil separator is connected with the input end of the gas-liquid separator through an unloading valve.
Compared with the prior art, the invention has the advantages and positive effects that: the multi-split heat pump system with the three-stage centrifugal compressor can respectively realize different series combinations of the first stage, the second stage and the third stage by adjusting the flow directions of the two three-way valves, so as to meet the performance requirements of the system under different loads, the capacity range is adjustable from 2Hp to 80Hp, one or more vortex compressors can be replaced, and the system efficiency under partial load is high, so that the operating range of the compressor can be widened, and the multi-split heat pump system can be used for even unit machine systems and household air conditioners, and high efficiency and energy saving can be realized.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system diagram of one embodiment of a multiple on-line heat pump system with three stage centrifugal compressor in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a first embodiment, as shown in fig. 1, the present embodiment proposes a multi-split heat pump system with a three-stage centrifugal compressor, which includes a compressor 1, a four-way valve 2, a gas-liquid separator 4 connected to an s-end of the four-way valve 2, a condenser 5 connected to a c-end of the four-way valve 2, a gas pipe stop valve 3 connected to an e-end of the four-way valve 2, an oil separator 14 connected to a d-end of the four-way valve 2, a main electronic expansion valve 6 connected to the condenser 5, a liquid pipe stop valve 7 connected to the main electronic expansion valve 6, an evaporator 8 with two ends connected to the gas pipe stop valve 3 and the liquid pipe stop valve 7, respectively, the compressor 1 includes a first-stage compression chamber 10, a second-stage compression chamber 11, and a three-stage compression chamber 12 connected in sequence, an air inlet of the first-stage compression chamber 10 is connected to an air outlet of the gas-liquid separator 4, two ends of the first three-way valve 9 are connected to an air inlet and an air outlet of the second-stage compression chamber 11, two-stage compression chamber 11 is further connected to a second three-way valve 13, two ends of the second three-way valve 13 are connected to an air outlet of the third-stage compression chamber 12, respectively, and two ends of the third three-stage compression chamber 12 is connected to an air inlet 12 is connected to an air outlet of the air inlet of the third compression chamber respectively. The multi-split heat pump system with the three-stage centrifugal compressor comprises the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity, the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity are of an integral structure design, the three cavities are not required to be respectively installed, different serial combinations of the first-stage compression cavity, the second-stage compression cavity and the third-stage compression cavity can be respectively realized by adjusting the flow directions of two three-way valves, so that the performance requirements of the system under different loads can be met, the capacity range is adjustable from 2Hp to 80Hp, one or more vortex compressors can be replaced, the system efficiency under partial loads is high, in addition, the advantages of the traditional centrifugal compressor are maintained, the operation range of the compressor can be widened, and the multi-split system, even the unit system and the household air conditioner can be used, and therefore the high efficiency and the energy saving can be realized.
The multiple on-line heat pump system in this embodiment further includes a first plate heat exchanger 15, as shown in fig. 1, where the first plate heat exchanger 15 includes a first heat exchange channel and a first air supplementing channel, the first heat exchange channel is connected between the main electronic expansion valve 6 and the liquid pipe stop valve 7, one end of the first air supplementing channel is connected with the main electronic expansion valve 6 through the first electronic expansion valve 16, and the other end is connected with the air inlet of the secondary compression cavity 11. When the exhaust pressure output by the primary compression cavity is insufficient, the first electronic expansion valve 16 is controlled to be opened to supplement air, so that the exhaust pressure of the primary compression cavity is increased, and the compression energy efficiency is improved.
The same reason is that the multi-split heat pump system further comprises a second plate heat exchanger 17, the second plate heat exchanger 17 comprises a second heat exchange channel and a second air supplementing channel, one end of the second heat exchange channel is connected with the first heat exchange channel, the other end of the second heat exchange channel is connected with the liquid pipe stop valve 7, one end of the second air supplementing channel is connected with the first heat exchange channel through the second electronic expansion valve 18, and the other end of the second air supplementing channel is connected with the air inlet of the three-stage compression cavity 12. When the exhaust pressure output by the secondary compression cavity is insufficient, the second electronic expansion valve 18 is controlled to be opened to supplement air, so that the exhaust pressure of the secondary compression cavity is improved.
In addition, the first plate heat exchanger 15 and the second plate heat exchanger 17 can also be realized by adopting a flash tank instead, and the functions of supplementing air for the secondary compression cavity and the tertiary compression cavity can also be realized.
The compressor 1 is a centrifugal compressor, impellers are respectively arranged in the first-stage compression cavity 10, the second-stage compression cavity 11 and the third-stage compression cavity 12, and the sizes of the impellers in the first-stage compression cavity 10, the second-stage compression cavity 11 and the third-stage compression cavity 12 are sequentially increased. Making the compression capacity of each stage differential. The control logic can adjust the flow direction of the three-way valve according to different loads, and can respectively realize different serial combinations of the first stage, the second stage and the third stage so as to meet the performance requirements of the system under different loads. For example, the load capacity of the primary compression chamber 10 is set to 10%, the load capacity of the secondary compression chamber 11 is set to 40%, and the load capacity of the tertiary compression chamber 12 is set to 50%:
when the capacity load of the compressor is 10%, the first three-way valve 9 and the pipeline are utilized to bypass the secondary compression cavity 11, and the second three-way valve 13 and the pipeline are utilized to bypass the tertiary compression cavity 12, so that only the primary compression cavity 10 is utilized to compress at the moment, and the performance requirement is met.
When the required load of the compressor capacity is 50%, the flow of the first three-way valve 9 is guided and regulated to the secondary compression cavity 11, the tertiary compression cavity 12 is bypassed by utilizing the second three-way valve 13 and a pipeline, and the serial combination of the primary compression cavity 10 and the secondary compression cavity 11 is realized at the moment, so that the performance requirement is met.
When the required load of the compressor capacity is 100%, the flow of the first three-way valve 9 is guided and adjusted to the secondary compression cavity 11, the flow of the second three-way valve 13 is guided and adjusted to the tertiary compression cavity 12, and the series combination of the primary compression cavity 10, the secondary compression cavity 11 and the tertiary compression cavity 12 is realized at the moment, so that the performance requirement is met.
The output end of the condenser 5 is also connected to the input end of the gas-liquid separator 4 through a passage, on which a liquid-spraying valve 19 is provided.
The output of the oil separator 14 is connected to the input of the gas-liquid separator 4 through an unloading valve 20.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that other variations, modifications, additions and substitutions are possible, without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (6)
1. The utility model provides a many online heat pump system with tertiary centrifugal compressor, includes compressor, cross valve, with the gas-liquid separator that the s end of cross valve is connected, with the condenser that the c end of cross valve is connected, with the trachea stop valve that the e end of cross valve is connected, with the oil separator that the d end of cross valve is connected, with the main electron expansion valve that the condenser is connected, with the liquid pipe stop valve that the main electron expansion valve links to each other, both ends respectively with the evaporimeter that trachea stop valve and liquid pipe stop valve are connected, its characterized in that: the compressor is including the one-level compression chamber, two-stage compression chamber and the tertiary compression chamber of connecting in order, the air inlet of one-level compression chamber with vapour and liquid separator's gas vent is connected, the gas vent of one-level compression chamber is connected with first three-way valve, the other both ends of first three-way valve respectively with the air inlet and the gas vent of two-stage compression chamber are connected, the gas vent of two-stage compression chamber still is connected with the second three-way valve, the other one end of second three-way valve respectively with the air inlet and the gas vent of three-stage compression chamber are connected, the gas vent of three-stage compression chamber with oil separator connects.
2. The multi-split heat pump system of claim 1, wherein: the multi-split heat pump system further comprises a first plate heat exchanger, the first plate heat exchanger comprises a first heat exchange channel and a first air supplementing channel, the first heat exchange channel is connected between the main electronic expansion valve and the liquid pipe stop valve, one end of the first air supplementing channel is connected with the main electronic expansion valve through the first electronic expansion valve, and the other end of the first air supplementing channel is connected with an air inlet of the secondary compression cavity.
3. The multi-split heat pump system of claim 2, wherein: the multi-split heat pump system further comprises a second plate heat exchanger, the second plate heat exchanger comprises a second heat exchange channel and a second air supplementing channel, one end of the second heat exchange channel is connected with the first heat exchange channel, the other end of the second heat exchange channel is connected with the liquid pipe stop valve, one end of the second air supplementing channel is connected with the first heat exchange channel through a second electronic expansion valve, and the other end of the second air supplementing channel is connected with an air inlet of the three-stage compression cavity.
4. A multiple on-line heat pump system according to any one of claims 1-3, wherein: the compressor is a centrifugal compressor, impellers are respectively arranged in the primary compression cavity, the secondary compression cavity and the tertiary compression cavity, and the sizes of the impellers in the primary compression cavity, the secondary compression cavity and the tertiary compression cavity are sequentially increased.
5. A multiple on-line heat pump system according to any one of claims 1-3, wherein: the output end of the condenser is also connected with the input end of the gas-liquid separator through a passage, and a liquid spraying valve is arranged on the passage.
6. A multiple on-line heat pump system according to any one of claims 1-3, wherein: the output end of the oil separator is connected with the input end of the gas-liquid separator through an unloading valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990125.2A CN106500393B (en) | 2016-11-10 | 2016-11-10 | Multi-split heat pump system with three-stage centrifugal compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610990125.2A CN106500393B (en) | 2016-11-10 | 2016-11-10 | Multi-split heat pump system with three-stage centrifugal compressor |
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| CN106500393A CN106500393A (en) | 2017-03-15 |
| CN106500393B true CN106500393B (en) | 2023-09-29 |
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| CN201610990125.2A Active CN106500393B (en) | 2016-11-10 | 2016-11-10 | Multi-split heat pump system with three-stage centrifugal compressor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489467B (en) * | 2017-08-03 | 2023-11-14 | 中国科学院理化技术研究所 | Compressed air pumping energy storage system |
| CN108444138A (en) * | 2018-04-17 | 2018-08-24 | 山东美琳达再生能源开发有限公司 | A kind of Two-stage Compression low-temperature air source heat pump unit and method with refrigerating function |
| CN108489130A (en) * | 2018-06-06 | 2018-09-04 | 深圳市派沃新能源科技股份有限公司 | A kind of screw single machine three stage compression heat pump heating system and control method |
| CN111237928B (en) * | 2020-01-19 | 2021-02-26 | 珠海格力电器股份有限公司 | Double-temperature double-flash air conditioner refrigerating system |
| CN114992910A (en) * | 2022-05-26 | 2022-09-02 | 浙江中广电器集团股份有限公司 | Three-stage compressed air source heat pump unit adopting flash tank and economizer |
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| GB535738A (en) * | 1938-12-24 | 1941-04-21 | Sulzer Ag | Improvements in or relating to pumps |
| DE202004001051U1 (en) * | 2004-01-27 | 2004-04-15 | BSW Verfahrenstechnik GmbH Ingenieur- und Beratungsbüro | Multi-headed pump used as a membrane pump for producing a vacuum comprises shut-off and switching devices integrated in the suction and pressure lines between the pump heads |
| CN206269418U (en) * | 2016-11-10 | 2017-06-20 | 青岛海尔中央空调有限公司 | Multi-connected machine heat pump with three-level centrifugal compressor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009056987A2 (en) * | 2007-11-01 | 2009-05-07 | Danfoss Turbocor Compressors Bv. | Multi-stage compressor |
| KR101873597B1 (en) * | 2012-02-23 | 2018-07-31 | 엘지전자 주식회사 | An air conditioner |
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2016
- 2016-11-10 CN CN201610990125.2A patent/CN106500393B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB535738A (en) * | 1938-12-24 | 1941-04-21 | Sulzer Ag | Improvements in or relating to pumps |
| DE202004001051U1 (en) * | 2004-01-27 | 2004-04-15 | BSW Verfahrenstechnik GmbH Ingenieur- und Beratungsbüro | Multi-headed pump used as a membrane pump for producing a vacuum comprises shut-off and switching devices integrated in the suction and pressure lines between the pump heads |
| CN206269418U (en) * | 2016-11-10 | 2017-06-20 | 青岛海尔中央空调有限公司 | Multi-connected machine heat pump with three-level centrifugal compressor |
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