CN110887231A - Air energy jet enthalpy-increasing ultralow-temperature cascade water boiler - Google Patents
Air energy jet enthalpy-increasing ultralow-temperature cascade water boiler Download PDFInfo
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- CN110887231A CN110887231A CN201911171518.0A CN201911171518A CN110887231A CN 110887231 A CN110887231 A CN 110887231A CN 201911171518 A CN201911171518 A CN 201911171518A CN 110887231 A CN110887231 A CN 110887231A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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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
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to an air energy enhanced vapor injection ultralow temperature cascade water boiler, which comprises a first circulation system of a refrigeration system and a second circulation system of a water boiling system, wherein the first circulation system and the second circulation system are connected through an intermediate heat exchanger; the first circulating system is provided with an auxiliary enthalpy increasing system, the auxiliary enthalpy increasing system comprises an enthalpy increasing valve and an enthalpy increasing electronic expansion valve, and the enthalpy increasing valve and the enthalpy increasing electronic expansion valve are installed on the first circulating system through an auxiliary pipeline. The air energy enhanced vapor injection ultralow temperature cascade water boiler can prepare 100 ℃ boiled water, is suitable for severe cold weather with the temperature of minus 15 ℃ and has high efficiency.
Description
Technical Field
The invention relates to the technical field of material drying, in particular to an air energy enhanced vapor injection ultralow temperature cascade water boiler.
Background
Known from the second law of thermodynamics: heat cannot spontaneously transfer from a low temperature environment to a high temperature environment. Since the heat is transferred from the low temperature environment to the high temperature environment, the external work is consumed, and the work is changed into heat.
The heat pump unit utilizes low-grade heat in the environment, so that the heat output efficiency is far greater than 1, and the heat pump is the best form for utilizing low-grade heat sources.
At present, heat pumps are divided into a plurality of forms according to different types of heat sources, but basically have the following two defects:
firstly, there is the restriction to ambient temperature, and current heat pump set is mainly applicable to the ambient temperature that the temperature is higher than one 15 ℃, after the temperature is less than one 15 ℃ for the start-up of heat pump is difficult, unable normal use, makes the range of application reduce greatly.
Secondly, the heating temperature is limited, and the existing heat pump unit generally produces bath hot water at 50-60 ℃ but cannot produce drinking boiled water at 100 ℃.
Disclosure of Invention
The air energy jet enthalpy-increasing ultralow temperature overlapping water boiler provided by the invention has high efficiency, is suitable for severe cold weather at the temperature of 15 ℃ below zero, and can be used for preparing boiled water.
In order to achieve the above purpose, the following technical solutions are provided.
An air energy jet enthalpy-increasing ultralow-temperature cascade water boiler comprises a first circulation system and a second circulation system, wherein the first circulation system is a refrigerating system, the second circulation system is a boiling water system, temperature detectors are arranged in the first circulation system and the second circulation system, the first circulation system and the second circulation system are connected through an intermediate heat exchanger, refrigerant gas evaporated by the first circulation system is subjected to heat exchange with liquid refrigerant condensed by the second circulation system through the intermediate heat exchanger, so that the refrigerant in the first circulation system is evaporated to absorb heat in air and then provides heat for the second circulation system through the intermediate heat exchanger to heat water in a water heater; the first circulation system is provided with an auxiliary enthalpy increasing system, the auxiliary enthalpy increasing system comprises an enthalpy increasing valve and an enthalpy increasing electronic expansion valve, and the enthalpy increasing valve and the enthalpy increasing electronic expansion valve are installed on the first circulation system through an auxiliary pipeline.
Further, the first circulation system comprises an evaporator, a first four-way valve, a first separator, a first compressor, a first filter, a first liquid storage device and a first expansion valve, a refrigerant outlet of the evaporator is connected with one port of the first four-way valve, two flows out of a port of the first four-way valve through the first four-way valve are connected with an inlet of the first separator through a pipeline, refrigerant gas after gas-liquid separation enters the first compressor through the pipeline, is compressed into high-temperature and high-pressure gas by the first compressor and then is discharged, is connected with a port three of the first four-way valve through the pipeline, flows out of a port four through the first four-way valve and enters an intermediate heat exchanger to perform heat exchange with the second circulation system for cooling, the refrigerant gas after heat exchange sequentially passes through the first filter and the first liquid storage device and then enters the first expansion valve, is throttled by the first expansion valve and then becomes low-temperature and low-pressure liquid to enter, the refrigerant is combined with an outdoor fan outside the evaporator to absorb heat through evaporation and become refrigerant gas, a refrigeration cycle of the first circulating system is completed, the refrigerant which absorbs heat through the evaporator and is evaporated into gas enters the first port of the first four-way valve again, and the next refrigeration cycle is continued.
Furthermore, the first circulating system also comprises a one-way converter, the one-way converter comprises two liquid one-way switching valves arranged on the two pipelines in parallel and two gas one-way switching valves arranged on the two pipelines in parallel, the refrigerant gas is filtered by a filter and then is respectively communicated with an inlet of one gas one-way switching valve and an outlet of one liquid one-way switching valve through the two pipelines, and outlet pipelines of the two gas one-way switching valves are communicated with an inlet of the first liquid reservoir through a main pipe; the refrigerant gas is throttled by a first expansion valve and then is respectively communicated with inlets of two liquid one-way conversion valves through two pipelines, and outlets of the two liquid one-way conversion valves are respectively communicated with an inlet of an evaporator and an inlet of one gas one-way conversion valve through pipelines.
Furthermore, the first circulating system also comprises an economizer, wherein the upper part and the lower part of the economizer are respectively provided with an inlet and an outlet, the economizer is positioned on a header pipe between the one-way converter and the first liquid storage device, the first header pipe is disconnected by the economizer, and the inlet at the upper part and the outlet at the lower part of the economizer are respectively communicated with two end parts of the disconnected header pipe; the other inlet of the economizer is positioned at the lower part of the economizer and is communicated with an enthalpy increasing system, and the enthalpy increasing system is positioned on a main pipe section between the economizer and a first liquid storage device; the other outlet of the economizer is positioned at the upper part of the economizer and is connected with the first compressor through a pipeline.
Furthermore, a one-way switching valve is arranged on a connecting pipeline between the economizer and the first compressor.
Further, the second circulating system comprises a water heater, a second four-way valve, a second separator, a second compressor, a second filter, a second liquid storage device and a second expansion valve, a liquid refrigerant after heat exchange by the intermediate heat exchanger is communicated with a first port of the second four-way valve through a pipeline, flows out of a second port of the second four-way valve after passing through the second four-way valve, is connected with an inlet of the second separator through a pipeline, the liquid refrigerant after separation by the second separator is communicated with a return air port of the compressor through a pipeline and enters the second compressor, high-temperature and high-pressure gas compressed by the second compressor is discharged through an exhaust port, is communicated with a third port of the second four-way valve through a pipeline, flows out of a fourth port of the second four-way valve after passing through the second four-way valve, is communicated with an inlet of a coil pipe positioned in the water heater through a pipeline, and enters the coil pipe in the water heater to, the outlet end of the coil pipe is sequentially connected with a second high-pressure liquid storage device, a second filter and a second expansion valve through a pipeline and then enters an intermediate heat exchanger to exchange heat with the gas refrigerant in the first circulating system, so that the preparation of the boiled water in the second circulating system is completed, the refrigerant after heat exchange in the intermediate heat exchanger enters the first port of the second four-way valve again, and the next circulation is continued.
Furthermore, the water boiler comprises a heat preservation box body, a coil pipe is arranged in the heat preservation box body, the inlet end and the outlet end of the coil pipe are respectively positioned outside the heat preservation box body, the coil pipe is an S-shaped coil pipe which is spirally wound from top to bottom, and the inlet end of the coil pipe is positioned at the upper part of one side of the heat preservation box body; the lower part of the other side of the insulation box body corresponding to the inlet and outlet ends of the coil pipe is provided with a water inlet, and the upper part of the insulation box body is provided with a water outlet.
Furthermore, a safety valve is arranged at the top of the heat preservation box body, and a sewage draining outlet is arranged at the bottom of the heat preservation box body.
Furthermore, valves are arranged on the inlet end pipeline and the outlet end pipeline of the coil pipe.
Furthermore, a high-pressure switch and a high-pressure meter are arranged on a pipeline between the first four-way valve and the first compressor and a pipeline between the second four-way valve and the second compressor, so that the pressure of the refrigerant and the pressure protection of the system can be timely obtained.
Compared with the prior art, the air energy enhanced vapor injection ultralow temperature cascade water boiler has the following beneficial effects:
the invention relates to an enhanced vapor injection ultralow temperature cascade water boiler, which adopts an air energy heat pump and mainly solves the following 3 problems:
1. the traditional heat pump unit can start the difficult technological problem in severe cold area air: the prior art is operated at the environmental temperature below 15 ℃ below zero in winter, and has the disadvantages of difficult start, low operation pressure, small air suction specific gravity and unstable system. The air energy enhanced vapor injection system in the ultralow temperature overlapping water boiler is added, so that the system can normally operate at the ambient temperature of-25 ℃;
2. the technical problem of high system pressure when the traditional heat pump unit produces hot water at 100 ℃ is as follows: when the air energy heat pump in the prior art is used for producing boiled water at 100 ℃, the system pressure is high, the exhaust temperature is high, and the pressure difference is large, so that the system cannot normally operate. The invention combines a cascade double-machine system, a high-temperature compressor and a high-temperature refrigerant are adopted at a high-temperature stage, the pressure of high-temperature hot water at 100 ℃ is not more than 25kg, and the exhaust temperature is not more than 115 ℃;
3. the technical problem of low efficiency of the traditional heat pump unit is as follows: the enhanced vapor injection system is additionally provided with the efficient economizer, and after the condensation of the system heat exchanger, the efficient economizer performs secondary supercooling, reduces the temperature of the evaporator, improves enthalpy difference and increases refrigerating capacity; meanwhile, a part of heat recovered by heat exchange is brought back to the compressor, so that the heating capacity of the compressor of the system is improved, and the energy efficiency of 100 ℃ boiled water produced in a low-temperature environment can be kept at 150%.
The invention relates to an enhanced vapor injection ultralow temperature cascade water boiler, wherein a first circulating system adopts an enhanced vapor injection system, when the first circulation system detects that the environmental temperature is lower than-15 ℃ or below, the main-path electronic expansion valve, namely the first electronic expansion valve, can close the opening degree due to the temperature difference of the evaporator, the exhaust temperature of the first compressor is increased, meanwhile, the flow of the refrigerant of the evaporator is reduced, so that the return gas low-pressure of the first compressor is reduced, the auxiliary system opens the enthalpy increasing valve, the enthalpy increasing electronic expansion valve, part of the refrigerant enters the inlet at the other side of the economizer, the refrigerant exchanges heat with the supercooling end in the economizer, the refrigerant is evaporated into gas after absorbing part of heat, the gas passes through the one-way valve and enters the gas supplementing port of the compressor, the return gas pressure of the compressor is increased, the exhaust temperature of the compressor is reduced, and the power and the efficiency of the compressor are improved.
Drawings
FIG. 1 is an overall schematic diagram of an air energy enhanced vapor injection ultralow temperature cascade water boiler;
FIG. 2 is a schematic view of the first cycle system of FIG. 1;
FIG. 3 is a schematic view of the second circulation system of FIG. 1.
Detailed Description
The air energy enhanced vapor injection ultralow temperature cascade water boiler of the invention is further described in detail by combining the specific embodiment and the attached drawings.
Referring to fig. 1 to 3, an air energy enhanced ultralow temperature cascade water boiler comprises a first circulation system and a second circulation system, wherein the first circulation system is a refrigeration system, the second circulation system is a water boiling system, temperature detectors 33 are arranged in the first circulation system and the second circulation system, the first circulation system and the second circulation system are connected through an intermediate heat exchanger 3, and refrigerant gas evaporated by the first circulation system exchanges heat with liquid refrigerant condensed by the second circulation system through the intermediate heat exchanger 3, so that the refrigerant gas evaporated in the first circulation system provides heat for the second circulation system to heat water in a water heater 19; the first circulation system is provided with an auxiliary enthalpy increasing system, the auxiliary enthalpy increasing system comprises an enthalpy increasing valve 7 and an enthalpy increasing electronic expansion valve 8, and the enthalpy increasing valve 7 and the enthalpy increasing electronic expansion valve 8 are installed on the first circulation system through auxiliary pipelines. According to the air energy enhanced vapor injection ultralow temperature cascade water boiler, the first refrigeration circulating system and the second boiled water preparing circulating system are arranged, and the first circulating system and the second circulating system are connected through the intermediate heat exchanger 3, so that part of energy in high-temperature and high-pressure gas discharged by a compressor of the first circulating system is transferred to the second circulating system through the intermediate heat exchanger 3, and the efficiency of the compressor is effectively utilized; the arrangement of the auxiliary enthalpy-increasing system on the first circulating system is characterized in that when the temperature detector 33 in the first circulating system detects that the ambient temperature is lower than minus 15 ℃ or below, the enthalpy-increasing valve 7 in the auxiliary enthalpy-increasing system is opened, one part of the refrigerant enters the inlet on the other side of the economizer 6, the refrigerant exchanges heat with the supercooling end in the economizer 6, absorbs a part of heat and evaporates into gas, and then the gas returns to the first compressor 1, so that the return pressure of the first compressor 1 is increased, the exhaust temperature of the compressor is reduced, and the power and the efficiency of the compressor are improved.
Referring to fig. 1 and 2, the first circulation system includes an evaporator 11, a first four-way valve 2, a first separator 13, a first compressor 1, a first filter 4, a first reservoir 9, and a first expansion valve 10, a refrigerant outlet of the evaporator 11 is connected to a port of the first four-way valve 2, flows out from a port of the first four-way valve 2 after passing through the first four-way valve 2 and is connected to an inlet of the first separator 13 through a pipe, a refrigerant gas after gas-liquid separation enters the first compressor 1 through a pipe, temperature detectors 33 are respectively disposed on pipes of an air inlet and an air outlet of the first compressor 1 and are respectively used for detecting an ambient temperature before air is introduced into the first compressor 1 and an ambient temperature at an air outlet position after the gas compression is completed by the compressor, a first high pressure switch 14 is disposed on a pipe between the first separator 13 and the first compressor 1 and is compressed into a high temperature and high pressure gas by the first compressor 1 and then discharged, the third port of the first four-way valve 2 is connected with a pipeline, a second high-voltage switch 15 and a first high-voltage meter 16 are sequentially arranged on a connecting pipeline between the first compressor 1 and the first four-way valve 2 from the first compressor 1, and the pressure of the front and the back of the first compressor 1 can be obtained in time. After passing through the first four-way valve 2, the refrigerant gas flows out from the port four to enter the intermediate heat exchanger 3 to perform heat exchange with the second circulating system for cooling, the refrigerant gas after heat exchange sequentially passes through the first filter 4 and the first liquid storage device 9 and then enters the first expansion valve 10, the refrigerant gas after heat exchange is throttled by the first expansion valve 10 and then becomes low-temperature low-pressure liquid to enter the evaporator 11, the low-temperature low-pressure liquid is combined with an outdoor fan 12 outside the evaporator 11 to evaporate and absorb heat to become refrigerant gas, a refrigeration cycle of the first circulating system is completed, the refrigerant which absorbs heat by the evaporator 11 and evaporates into gas enters the port one of the first four-way valve 2 again.
Referring to fig. 1 and 2, the first circulation system further includes a one-way converter 5, the one-way converter 5 includes two liquid one-way switching valves arranged in parallel on two pipelines and two gas one-way switching valves arranged in parallel on two pipelines, the refrigerant gas is filtered by a filter and then respectively communicated with an inlet of one-way switching valve and an outlet of one-way switching valve through two pipelines, and outlet pipelines of two gas one-way switching valves are communicated with an inlet of the first reservoir 9 through a main pipe; the refrigerant gas is throttled by the first expansion valve 10 and then is respectively communicated with the inlets of the two liquid one-way conversion valves through two pipelines, and the outlets of the two liquid one-way conversion valves are respectively communicated with the inlet of the evaporator 11 and the inlet of one of the gas one-way conversion valves through pipelines. Two gaseous one-way change-over valves set up between first filter 4 and first reservoir 9, effectively ensure that refrigerant gas flows from first filter 4 and first reservoir 9 direction, two liquid one-way valves set up between first electronic expansion valve and first evaporimeter 11, effectively ensure that the refrigerant gets into evaporimeter 11 after the throttle of first electronic expansion valve, the evaporation of absorbing heat in evaporimeter 11, effectively avoided the condition that the refluence appears because of the pipeline sets up, the system refrigeration problem that arouses because of the improper refluence of pipeline setting among the prior art has been solved.
Referring to fig. 1 and 2, the first circulation system further includes an economizer 6, wherein an upper portion and a lower portion of the economizer 6 are respectively provided with an inlet and an outlet, the economizer 6 is located on the manifold between the one-way converter 5 and the first reservoir 9, the economizer 6 cuts off the first manifold, and an upper inlet and a lower outlet of the economizer 6 are respectively communicated with two ends of the cut manifold; the other inlet of the economizer 6 is positioned at the lower part of the economizer 6 and is communicated with an enthalpy increasing system which is positioned on a main pipe section between the economizer 6 and a first liquid accumulator 9; the other outlet of the economizer 6 is located at the upper portion of the economizer 6 and connected to the first compressor 1 through a pipe. Two import and two exports on 6 and the economic ware of 6 set up, and economic ware 6 sets up between first unidirectional converter 5 and first reservoir 9, makes the refrigerant gas after first filter 4 filters by first unidirectional converter 5 after, carries out the heat exchange earlier through economic ware 6 and makes refrigerant gas carry out once heat exchange cooling and then get into first reservoir 9, effectively promotes the system efficiency, does benefit to energy-conservation. And an outlet of the economizer 6 is connected with the first compressor 1 through a pipeline, so that a part of refrigerant after heat exchange directly returns to the first compressor 1 for compression, the utilization efficiency of the refrigerant is improved, and the energy efficiency of the system is further improved.
Referring to fig. 1 and 2, a one-way switching valve is disposed on a connection pipe between the economizer 6 and the first compressor 1, so that refrigerant gas after heat exchange by the economizer 6 is supplemented to the first compressor 1, the return pressure of the first compressor 1 is increased, the discharge temperature of the first compressor 1 is reduced, and the power and efficiency of the first compressor 1 are improved.
Referring to fig. 1 and 3, the second circulation system includes a water heater 19, a second four-way valve 18, a second separator 23, a second compressor 17, a second filter 21, a second reservoir 20 and a second expansion valve 22, a liquid refrigerant after heat exchange by the intermediate heat exchanger 3 is communicated with a first port of the second four-way valve 18 through a pipeline, flows out from a second port of the second four-way valve 18 through the second four-way valve 18, is connected with an inlet of the second separator 23 through a pipeline, the liquid refrigerant after separation by the second separator 23 is communicated with an air return port of the compressor through a pipeline and enters the second compressor 17, temperature detectors 33 are respectively arranged on an air inlet end and an air outlet end of the second compressor 17, a third high pressure switch 24 is arranged on a pipeline between the second separator 23 and the second compressor 17, and a high temperature and high pressure gas compressed by the second compressor 17 is discharged through an exhaust port, the third port of the second four-way valve 18 is communicated with a pipeline, a fourth high-pressure switch 25 and a second high-pressure gauge 26 are sequentially arranged on a connecting pipeline between the second compressor 17 and the second four-way valve 18 from the second compressor 17, and the pressure of the refrigerant in front of and behind the second compressor 17 can be obtained timely. And the refrigerant after heat exchange by the intermediate heat exchanger 3 enters the first port of the second four-way valve 18 again to continue the next cycle after heat exchange with the gas refrigerant in the first cycle system.
Referring to fig. 1 and 3, the water heater 19 includes a thermal insulation box 27, a coil 29 is disposed inside the thermal insulation box 27, an inlet end and an outlet end of the coil 29 are respectively located outside the thermal insulation box 27, the coil 29 is an S-shaped coil 29 that spirals from top to bottom, and an inlet end of the coil 29 is located at an upper portion of one side of the thermal insulation box 27; the lower part of the other side of the insulation box body 27 corresponding to the inlet and outlet ends of the coil pipe 29 is provided with a water inlet 32, and the upper part is provided with a water outlet 30, so that the water in the water heater 19 is ensured to be in full heat exchange with the refrigerant. The top of the heat preservation box body 27 is provided with a safety valve 28, and the bottom of the heat preservation box body 27 is provided with a sewage draining outlet 31. The safety valve 28 is arranged, when the temperature in the heat preservation box body 27 is higher than the safety value, the safety valve 28 is opened to release the pressure, and the use safety of the water boiler is ensured. The arrangement of the drain outlet 31 is convenient for cleaning and discharging the dirt in the heat preservation box body 27. Valves are arranged on the inlet end pipeline and the outlet end pipeline of the coil 29, so that the inlet and the outlet of the refrigerant in the coil 29 can be conveniently controlled.
Referring to fig. 1 to 3, compared with the prior art, the air energy enhanced ultralow temperature overlapping water boiler has the following beneficial effects:
the invention relates to an enhanced vapor injection ultralow temperature cascade water boiler, which adopts an air energy heat pump and mainly solves the following 3 problems:
1. the traditional heat pump unit can start the difficult technological problem in severe cold area air: the prior art is operated at the environmental temperature below 15 ℃ below zero in winter, and has the disadvantages of difficult start, low operation pressure, small air suction specific gravity and unstable system. The air energy enhanced vapor injection system in the ultralow temperature overlapping water boiler is added, so that the system can normally operate at the ambient temperature of-25 ℃;
2. the technical problem of high system pressure when the traditional heat pump unit produces hot water at 100 ℃ is as follows: when the air energy heat pump in the prior art is used for producing boiled water at 100 ℃, the system pressure is high, the exhaust temperature is high, and the pressure difference is large, so that the system cannot normally operate. The invention combines a cascade double-machine system, a high-temperature compressor and a high-temperature refrigerant are adopted at a high-temperature stage, the pressure of high-temperature hot water at 100 ℃ is not more than 25kg, and the exhaust temperature is not more than 115 ℃;
3. the technical problem of low efficiency of the traditional heat pump unit is as follows: the enhanced vapor injection system is additionally provided with the efficient economizer 6, after the condensation of a system heat exchanger, the efficient economizer 6 performs secondary supercooling, reduces the temperature of the evaporator 11, improves enthalpy difference and increases refrigerating capacity; meanwhile, a part of heat recovered by heat exchange is brought back to the compressor, so that the heating capacity of the compressor of the system is improved, and the energy efficiency of 100 ℃ boiled water produced in a low-temperature environment can be kept at 150%.
The invention relates to an enhanced vapor injection ultralow temperature cascade water boiler, wherein a first circulating system adopts an enhanced vapor injection system, when the first circulation system detects that the environmental temperature is lower than-15 ℃ or below, the main circuit electronic expansion valve, namely the first electronic expansion valve, is closed by the opening degree due to the temperature difference of the evaporator 11, the exhaust temperature of the first compressor 1 is increased, at the same time, the refrigerant of the evaporator 11 reduces the flow rate, the return air low pressure of the first compressor 1 is reduced, at this time, the auxiliary system opens the enthalpy increasing valve 7 and the enthalpy increasing electronic expansion valve 8, a part of refrigerant enters the inlet on the other side of the economizer 6, the refrigerant exchanges heat with the supercooling end in the economizer 6, and after absorbing a part of heat, the refrigerant is evaporated into gas and enters the gas supplementing port of the compressor through the one-way valve, the return pressure of the compressor is increased, the exhaust temperature of the compressor is reduced, and meanwhile, the power and the efficiency of the compressor are improved.
In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (10)
1. The utility model provides an air can air injection enthalpy-increasing ultra-low temperature cascade water dispensers which characterized in that: the system comprises a first circulating system and a second circulating system, wherein the first circulating system is a refrigerating system, the second circulating system is a water boiling system, temperature detectors are arranged in the first circulating system and the second circulating system, the first circulating system and the second circulating system are connected through an intermediate heat exchanger, refrigerant gas evaporated by the first circulating system is subjected to heat exchange with liquid refrigerant condensed by the second circulating system through the intermediate heat exchanger, and the refrigerant in the first circulating system is evaporated to absorb heat in air and then provides heat for the second circulating system through the intermediate heat exchanger so as to heat water in the water heating machine; the first circulation system is provided with an auxiliary enthalpy increasing system, the auxiliary enthalpy increasing system comprises an enthalpy increasing valve and an enthalpy increasing electronic expansion valve, and the enthalpy increasing valve and the enthalpy increasing electronic expansion valve are installed on the first circulation system through an auxiliary pipeline.
2. The air energy enhanced vapor injection ultralow temperature cascade water boiler according to claim 1, wherein the first circulation system comprises an evaporator, a first four-way valve, a first separator, a first compressor, a first filter, a first reservoir and a first expansion valve, a refrigerant outlet of the evaporator is connected with a first port of the first four-way valve, two refrigerant gases after gas-liquid separation flow out of a first port of the first four-way valve and are connected with an inlet of the first separator through a pipeline, the refrigerant gases after gas-liquid separation flow into the first compressor through a pipeline, are compressed into high-temperature and high-pressure gases by the first compressor and are discharged, the high-temperature and high-pressure gases flow out of a second port of the first four-way valve and flow into an intermediate heat exchanger through a fourth port of the first four-way valve to perform heat exchange with the second circulation system, and the heat is transferred to the second system, and the refrigerant gases after heat exchange sequentially flow through the first filter, the first filter, The first liquid storage device enters a first expansion valve, the first expansion valve throttles the first liquid storage device to become low-temperature low-pressure liquid, the low-temperature low-pressure liquid enters an evaporator, the low-temperature low-pressure liquid is combined with an outdoor fan outside the evaporator to absorb heat and become refrigerant gas, a refrigeration cycle of the first circulating system is completed, the refrigerant which absorbs heat and is evaporated into gas through the evaporator enters a first port of the first four-way valve again, and the next refrigeration cycle is continued.
3. The air-energy enhanced vapor injection ultralow-temperature cascade water boiler as claimed in claim 2, wherein the first circulation system further comprises a one-way converter, the one-way converter comprises two liquid one-way switching valves arranged on two pipelines side by side and two gas one-way switching valves arranged on two pipelines side by side, the refrigerant gas is filtered by a filter and then is respectively communicated with an inlet of one-way liquid switching valve and an outlet of one-way liquid switching valve through two pipelines, and an outlet pipeline connected with the gas one-way switching valve is communicated with an inlet of the first reservoir through a main pipe; the refrigerant gas is throttled by a first expansion valve and then is respectively communicated with inlets of two liquid one-way conversion valves through two pipelines, and outlets of the two liquid one-way conversion valves are respectively communicated with an inlet of an evaporator and an inlet of one gas one-way conversion valve through pipelines.
4. The air energy enhanced vapor injection ultralow temperature cascade water boiler as claimed in claim 3, wherein the first circulation system further comprises an economizer, the upper part and the lower part of the economizer are respectively provided with an inlet and an outlet, the economizer is positioned on the header pipe between the one-way converter and the first liquid reservoir, the first header pipe is disconnected by the economizer, and the inlet and the outlet on the upper part of the economizer are respectively communicated with two ends of the disconnected header pipe; the other inlet of the economizer is positioned at the lower part of the economizer and is communicated with an enthalpy increasing system, and the enthalpy increasing system is positioned on a main pipe section between the economizer and a first liquid storage device; the other outlet of the economizer is positioned at the upper part of the economizer and is connected with the first compressor through a pipeline.
5. The air energy enhanced vapor injection ultralow temperature cascade water boiler as claimed in claim 4, wherein a one-way change-over valve is arranged on a connecting pipeline between the economizer and the first compressor.
6. The air energy enhanced vapor injection ultralow temperature cascade water boiler according to any one of claims 1 to 5, wherein the second circulation system comprises a water heater, a second four-way valve, a second separator, a second compressor, a second filter, a second liquid reservoir and a second expansion valve, the liquid refrigerant after heat exchange by the intermediate heat exchanger is communicated with a first port of the second four-way valve through a pipeline, flows out of a second port of the second four-way valve after passing through the second four-way valve, is connected with an inlet of the second separator through a pipeline, the liquid refrigerant after separation by the second separator is communicated with an air return port of the compressor through a pipeline and enters the second compressor, the high-temperature and high-pressure gas after compression by the second compressor is discharged through an exhaust port, is communicated with a third port of the second four-way valve through a pipeline, and flows out of a fourth port of the second four-way valve after passing through the second four-way valve, the outlet end of the coil pipe is sequentially connected with a second high-pressure liquid storage device, a second filter and a second expansion valve through the pipeline and then enters an intermediate heat exchanger to exchange heat with a gas refrigerant in a first circulating system, so that the preparation of boiled water in a second circulating system is finished, the refrigerant after heat exchange of the intermediate heat exchanger enters a first port of a second four-way valve again, and the next circulation is continued.
7. The air energy enhanced vapor injection ultralow temperature cascade water boiler according to claim 6, characterized in that the water heater comprises a heat preservation box body, a coil pipe is arranged in the heat preservation box body, the inlet end and the outlet end of the coil pipe are respectively positioned outside the heat preservation box body, the coil pipe is an S-shaped coil pipe which is spirally wound from top to bottom, and the inlet end of the coil pipe is positioned at the upper part of one side of the heat preservation box body; the lower part of the other side of the insulation box body corresponding to the inlet and outlet ends of the coil pipe is provided with a water inlet, and the upper part of the insulation box body is provided with a water outlet.
8. The air energy enhanced vapor injection ultralow temperature overlapping water boiler according to claim 7, characterized in that a safety valve is arranged at the top of the heat preservation box body, and a drain outlet is arranged at the bottom of the heat preservation box body.
9. The air energy enhanced vapor injection ultra-low temperature cascade water boiler according to claim 8, wherein valves are arranged on the inlet end pipeline and the outlet end pipeline of the coil.
10. The air energy enhanced vapor injection ultralow temperature cascade water boiler according to claim 9, wherein a high-pressure switch and a high-pressure gauge are arranged on a pipeline between the first four-way valve and the first compressor and a pipeline between the second four-way valve and the second compressor, so that the pressure of a refrigerant and the pressure protection of a system can be timely obtained.
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