CN106595142B - Carbon dioxide heat pump with enhanced vapor injection loop for extremely cold weather - Google Patents
Carbon dioxide heat pump with enhanced vapor injection loop for extremely cold weather Download PDFInfo
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- CN106595142B CN106595142B CN201710068204.2A CN201710068204A CN106595142B CN 106595142 B CN106595142 B CN 106595142B CN 201710068204 A CN201710068204 A CN 201710068204A CN 106595142 B CN106595142 B CN 106595142B
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a carbon dioxide heat pump with an enhanced vapor injection loop for use in extremely cold weather, and relates to the technical field of heat pumps, wherein an expansion device comprises a first auxiliary capillary tube, a second auxiliary capillary tube and a control capillary tube electromagnetic valve; the carbon dioxide heat pump used for the enhanced vapor injection loop in the extremely cold weather comprises an indoor heat exchanger and a compressor, wherein a main loop and an enhanced enthalpy loop are arranged between an outlet of the indoor heat exchanger and the compressor in parallel; said expansion device being connected in series with said main circuit; a main capillary tube and an outdoor heat exchanger are sequentially connected between the expansion device and the compressor; the carbon dioxide heat pump for the air-injection enthalpy-increasing loop in the extremely cold weather is characterized in that the expansion device is connected in series with the main loop, and the technical problems that the traditional air source heat pump is insufficient in heat supply, the compressor ratio is increased and the system performance coefficient is sharply reduced along with the continuous reduction of outdoor temperature and the continuous increase of indoor heating load in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to an expansion device and a carbon dioxide heat pump with an enhanced vapor injection loop in extremely cold weather.
Background
According to the law of heat energy, heat is transferred from a place where the temperature is high to a place where the temperature is low when not controlled by external factors, while a heat pump is a machine for transferring heat from the place where the temperature is low to the place where the temperature is high, and an air conditioner is a common heat pump type.
The refrigerant of current air conditioner mostly uses freon to take freon refrigerant air conditioner as an example, and its theory of operation is:
(1) compressing low-temperature low-pressure gaseous Freon by a compressor to convert the gaseous Freon into high-temperature high-pressure gaseous Freon; then the gas state freon with high temperature and high pressure becomes liquid freon with normal temperature and high pressure by using a condenser (namely an outdoor machine) to release heat. That is, hot air is blown out from the outdoor unit.
(2) The high-pressure liquid freon in the condenser expands rapidly after reaching the capillary tube, and becomes low-temperature low-pressure liquid freon.
(3) Liquid freon of low temperature low pressure gets into evaporimeter (indoor set), because the space increases suddenly after freon reachs the evaporimeter from the capillary, and pressure reduces, and liquid freon will vaporize, becomes gaseous microthermal freon to absorb a large amount of heats. After the heat of the air in the evaporator is absorbed, the air in the evaporator becomes cold air, so that the cold air is blown out from the indoor unit.
The above processes are circulated, and energy conversion is realized through heat input and output of the condenser and the evaporator.
However, the above cycle is accompanied by the continuous decrease of outdoor temperature, the continuous increase of indoor heating load, the problems of insufficient heat supply, the increase of compressor ratio, the rapid decrease of system performance coefficient, etc. appear. Therefore, an urgent need exists in the art to provide a heat pump that can still provide sufficient heating capacity in low-temperature areas and extremely cold regions and can stably operate.
Based on the technical problem, the invention provides a carbon dioxide heat pump with an enhanced vapor injection loop in extremely cold weather to solve the technical problem.
Disclosure of Invention
The invention aims to provide an expansion device to solve the technical problem that the expansion device in the prior art can stably operate under low-temperature and extremely cold conditions.
The expansion device provided by the invention comprises a first auxiliary capillary, a second auxiliary capillary and a control capillary electromagnetic valve;
the second end of the first auxiliary capillary and the first end of the second auxiliary capillary are connected; the first end of the first auxiliary capillary is connected with the second end of the second auxiliary capillary, a branch is arranged between the second end of the first auxiliary capillary and the second end of the second auxiliary capillary, and a control capillary electromagnetic valve is arranged on the branch.
The expansion device provided by the invention comprises a first auxiliary capillary tube, a second auxiliary capillary tube and a control capillary tube electromagnetic valve. During heating, if the ambient temperature is lower than a certain value, the first auxiliary capillary and the second auxiliary capillary are simultaneously connected into the circulation loop by opening the capillary electromagnetic valve, so that the number of capillaries in the circulation loop is increased. The increase in the number of capillaries can result in an increase in the pressure difference between the inlet and outlet of the capillaries, making the pressure reducing throttling of the capillaries more pronounced. The expansion device described herein thus ultimately enables an increase in the heating capacity of the heat pump in the heat pump cycle.
The invention also aims to provide a carbon dioxide heat pump with an enhanced vapor injection loop in extremely cold weather so as to solve the technical problems of insufficient heat supply, increased compressor ratio and rapid reduction of system performance coefficient of the traditional air source heat pump along with the continuous reduction of outdoor temperature and the continuous increase of indoor heating load in the prior art.
The invention provides a carbon dioxide heat pump with an enhanced vapor injection loop for extremely cold weather, which comprises an indoor heat exchanger and a compressor, wherein the inlet of the indoor heat exchanger is connected with the outlet of the compressor, and a main loop and an enhanced vapor loop are arranged between the outlet of the indoor heat exchanger and the compressor in parallel; said expansion device being connected in series with said main circuit; and a main capillary tube and an outdoor heat exchanger are sequentially connected between the expansion device and the compressor.
The heat regenerator comprises a first inlet, a second inlet, a first outlet and a second outlet, the main loop flows in from the first inlet and flows out from the first outlet, and the enthalpy-increasing loop flows in from the second inlet and flows out from the second outlet; the second inlet is connected to a first end of the first auxiliary capillary, and a second end of the second auxiliary capillary is connected to the compressor.
Further, the enthalpy-increasing loop comprises an enthalpy-increasing loop solenoid valve and an expander; one end of the enthalpy-increasing loop electromagnetic valve is connected with the indoor heat exchanger, the other end of the enthalpy-increasing loop electromagnetic valve is connected with one end of the expander, and the other end of the expander is connected with the first inlet.
Further, a check valve is disposed between the first end of the first auxiliary capillary and the branch.
Further, a filter is arranged between the main capillary tube and the outdoor heat exchanger.
The outdoor heat exchanger is arranged on the main loop, and the outdoor heat exchanger is arranged between the outdoor heat exchanger and the compressor; a four-way valve is arranged between the gas-liquid separator and the outdoor heat exchanger.
Furthermore, an electromagnetic valve is arranged between a starting point of the parallel connection of the main loop and the enthalpy-increasing loop and the indoor heat exchanger; and a bidirectional expander is arranged between the inlet of the indoor heat exchanger and the outlet of the compressor.
Further, the refrigerant is carbon dioxide.
Further, the device also comprises a controller, wherein the capillary control electromagnetic valve, the enthalpy-increasing loop electromagnetic valve and the electromagnetic valve are communicated with the controller.
Because of the existing heat pump, when the outdoor temperature is very low, the heat exchange capacity of the outdoor unit is reduced, the return air quantity of the normal return air port of the compressor is reduced, the power of the compressor is reduced, and the best effect cannot be achieved. When the carbon dioxide heat pump with the enhanced vapor injection loop is used in extremely cold weather, on one hand, the refrigeration gas is supplemented through the enhanced vapor loop when the carbon dioxide heat pump works in extremely cold weather, so that the displacement of the compressor is increased, the amount of the circulating refrigerant for heating the heat exchanger of the indoor unit is increased, and the increase of the heating capacity is realized. Meanwhile, on the other hand, the expansion device is connected to the main circuit, and the heating capacity is increased by adjusting the number of connected capillaries.
The carbon dioxide heat pump for the enhanced vapor injection loop in the extremely cold weather controls the operation of the system by controlling the capillary electromagnetic valve and the electromagnetic valve of the enhanced vapor injection loop. Automatic adjustment within a large temperature range is realized by controlling the capillary electromagnetic valve. The refrigerant gas is supplemented through the enthalpy increasing loop, so that the exhaust volume of the compressor is increased. According to the carbon dioxide heat pump with the enhanced vapor injection loop in the extremely cold weather, the heating capacity is increased under the combined action of the structure of the main loop and the method for increasing the enhanced vapor injection loop, so that the carbon dioxide heat pump can stably operate in the extremely cold weather.
Based on this, compared with the prior art, the invention has the advantages that the system can stably run in extremely cold weather and is not influenced by low-temperature severe environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of an expansion device as provided herein;
fig. 2 is a schematic diagram of a carbon dioxide heat pump for an enhanced vapor injection circuit in extreme cold weather.
Marking: 1-an outdoor heat exchanger; 2-a compressor; 3-a four-way valve; 4-a gas-liquid separator; 5-indoor heat exchanger; 6-enthalpy-increasing loop electromagnetic valve; 7-an expander; 8-a first auxiliary capillary; 9-a second auxiliary capillary; 10-a heat regenerator; 11-controlling a capillary electromagnetic valve; 12-a one-way valve; 13-a primary capillary; 14-a filter.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example one
As shown in fig. 1, in the present embodiment, there is provided an expansion device including a first auxiliary capillary tube 8, a second auxiliary capillary tube 9, and a control capillary tube solenoid valve 11;
the second end of the first auxiliary capillary 8 and the first end of the second auxiliary capillary 9 are connected; a first end of the first auxiliary capillary 8 is connected with a second end of the second auxiliary capillary 9, a branch is arranged between the second end of the first auxiliary capillary 8 and the second end of the second auxiliary capillary 9, and a control capillary solenoid valve 11 is arranged on the branch.
The expansion device provided by the invention comprises a first auxiliary capillary 8, a second auxiliary capillary 9 and a control capillary electromagnetic valve 11. During heating, if the ambient temperature is lower than a certain value, the first auxiliary capillary 8 and the second auxiliary capillary 9 are simultaneously connected to the circulation loop by opening the capillary electromagnetic valves, so that the number of capillaries in the circulation loop is increased. Since the performance of the heat pump mainly depends on the state of the refrigerant at the inlet of the capillary tube and the geometric size of the capillary tube, the increase of the number of the capillary tubes can cause the pressure difference between the inlet and the outlet of the capillary tube to increase, so that the pressure reduction and throttling effects of the capillary tube are more obvious. The expansion device described herein thus ultimately enables an increase in the heating capacity of the heat pump in the heat pump cycle.
Further, a check valve 12 is provided between the first end of the first auxiliary capillary 8 and the branch.
The expansion device provided by the invention can realize both cooling and heating, and the specifications of the capillary tube required for cooling and the capillary tube required for heating are the same, so that a one-way valve 12 is arranged between the first end of the first auxiliary capillary tube 8 and the branch. During cooling, the refrigerant passes through the circuit including the check valve 12.
Example two
The carbon dioxide heat pump for the enhanced vapor injection loop in the extreme cold weather provided by the embodiment also belongs to the technical scheme described in the embodiment one, and the technical scheme described in the embodiment one is not repeatedly described.
Specifically, as shown in fig. 2, in the present embodiment, a carbon dioxide heat pump for an enhanced vapor injection loop in extremely cold weather is provided, which includes an indoor heat exchanger 5 and a compressor 2, an inlet of the indoor heat exchanger 5 is connected to an outlet of the compressor 2, and a main loop and an enhanced vapor loop are arranged in parallel between an outlet of the indoor heat exchanger 5 and the compressor 2; the expansion device of claim 1 connected in series on the main circuit; a main capillary tube 13 and an outdoor heat exchanger 1 are connected between the expansion device and the compressor 2 in sequence.
Because of the existing heat pump, when the outdoor temperature is very low, the heat exchange capacity of the outdoor unit is reduced, the return air quantity of the normal return air port of the compressor 2 is reduced, the power of the compressor 2 is reduced, and the best effect can not be achieved. When the carbon dioxide heat pump with the enhanced vapor injection loop is used in extremely cold weather, on one hand, the refrigeration gas is supplemented through the enhanced vapor loop, so that the displacement of the compressor 2 is increased, the amount of the circulating refrigerant for heating the heat exchanger of the indoor unit is increased, and the heating capacity is increased. Meanwhile, on the other hand, the expansion device is connected to the main circuit, and the amount of heating is increased by adjusting the number of connected capillaries.
The carbon dioxide heat pump for the enhanced vapor injection loop in the extremely cold weather controls the operation of the system by controlling the capillary electromagnetic valve 11 and the electromagnetic valve of the enhanced vapor injection loop. Automatic regulation in a large temperature range is achieved by controlling the capillary solenoid valve 11. The refrigerant gas is supplemented through the enthalpy-increasing circuit, thereby increasing the discharge capacity of the compressor 2. According to the carbon dioxide heat pump with the enhanced vapor injection loop in the extremely cold weather, the heating capacity is increased under the combined action of the structure of the main loop and the method for increasing the enhanced vapor injection loop, so that the carbon dioxide heat pump can stably operate in the extremely cold weather.
Further, the heat regenerator 10 is further included, the heat regenerator 10 includes a first inlet, a second inlet, a first outlet and a second outlet, the primary loop flows in from the first inlet and flows out from the first outlet, and the enthalpy-increasing loop flows in from the second inlet and flows out from the second outlet; the second inlet is connected to a first end of the first auxiliary capillary 8, and a second end of the second auxiliary capillary 9 is connected to the compressor 2.
The heat regenerator 10 has three main functions, namely, high-pressure liquid before throttling is supercooled to avoid vaporization before throttling, and meanwhile, the suction temperature of the compressor 2 is increased to reduce harmful overheating and improve the working condition of the compressor 2; secondly, the refrigeration coefficient of the refrigeration device can be improved; thirdly, liquid vaporization carried in the gas is counteracted, cold energy can be recycled, and normal oil return of the compressor 2 can be ensured.
Further, the enthalpy-increasing loop comprises an enthalpy-increasing loop solenoid valve 6 and an expander 7; one end of the enthalpy-increasing loop electromagnetic valve 6 is connected with the indoor heat exchanger 5, the other end of the enthalpy-increasing loop electromagnetic valve is connected with one end of the expander 7, and the other end of the expander 7 is connected with the first inlet. When the heat pump detects that the external temperature should be connected into the enthalpy-increasing loop, whether the enthalpy-increasing loop is connected or not can be controlled by controlling the enthalpy-increasing loop electromagnetic valve 6, so that the automatic operation of the heat pump is realized.
In an alternative of this embodiment, as shown in fig. 2, a filter 14 is provided between the main capillary tube 13 and the outdoor heat exchanger 1. The filter 14 is used to remove impurities from the refrigerant liquid,
as shown in fig. 2, in the alternative of this embodiment, a gas-liquid separator 4 is further included, and the gas-liquid separator 4 is disposed on the main loop between the outdoor heat exchanger 1 and the compressor 2; a four-way valve 3 is provided between the gas-liquid separator 4 and the outdoor heat exchanger 1.
In an alternative of this embodiment, as shown in fig. 2, a solenoid valve is arranged between the starting point of the parallel connection of the main circuit and the enthalpy-increasing circuit and the indoor heat exchanger 5; a bidirectional expander 7 is arranged between the inlet of the indoor heat exchanger 5 and the outlet of the compressor 2.
In an alternative to this embodiment, as shown in fig. 2, the refrigerant is carbon dioxide. When the refrigerant is used as a refrigerant, the working principle of the carbon dioxide is basically the same as that of the freon, but the carbon dioxide is more environment-friendly when being used.
In an alternative of this embodiment, as shown in fig. 2, a controller is further included, and the control capillary solenoid valve 11, the enthalpy-increasing circuit solenoid valve 6 and the solenoid valves are all communicated with the controller. The controller can automatically control the opening and closing of each valve.
The invention provides a carbon dioxide heat pump with enhanced vapor injection loop in extreme cold weather, which comprises the following working processes:
when the indoor air heater is used for heating in winter, high-pressure refrigerant steam discharged by the compressor 2 flows into the indoor heat exchanger 5 (used as a condenser) through the four-way valve 3 and releases heat when the refrigerant steam is condensed, so that the indoor air is heated, and the aim of heating the indoor air is fulfilled. The refrigerant coming out of the indoor heat exchanger 5 will then be divided into two cases:
in the first case: when the system heats at the temperature higher than-5 ℃, the capillary electromagnetic valve 11 is controlled to be opened, the control electromagnetic valve is a normally open electromagnetic valve, the enthalpy-increasing loop electromagnetic valve 6 is closed, and the enthalpy-increasing loop electromagnetic valve is a normally closed electromagnetic valve. The refrigerant from the indoor heat exchanger 5 directly enters the heat regenerator 10, then passes through the first auxiliary capillary tube 8 loop, then enters the filter 14 through the main capillary tube 13, the filtered refrigerant enters the outdoor heat exchanger 1 (used as an evaporator), the evaporated steam passes through the four-way valve 3 again, enters the gas-liquid separator 4, and finally is sucked by the compressor 2, and the heating cycle is completed.
In the second case: when the system heats at the temperature lower than-5 ℃ in the environment, the capillary solenoid valve 11 is controlled to be closed, and the enthalpy-increasing loop solenoid valve 6 is controlled to be opened. The refrigerant from the indoor heat exchanger 5 enters the heat regenerator 10 through the expander 7, a small part of the refrigerant from the heat regenerator 10 directly returns to the compressor 2 again to supplement the refrigerant gas, so that the displacement of the compressor 2 is increased, the amount of the circulating refrigerant heated by the indoor heat exchanger is increased, and the increase of the heating capacity is realized; meanwhile, most of the refrigerant from the heat regenerator 10 passes through the first auxiliary capillary tube 8 and the second auxiliary capillary tube 9, namely, both the two capillary tubes are connected into a loop; then enters the filter 14 through the main capillary tube 13, the filtered refrigerant enters the outdoor heat exchanger 1 (used as an evaporator), the evaporated steam enters the gas-liquid separator 4 after passing through the four-way valve 3 again, and finally is sucked by the compressor 2, thus completing the heating cycle.
It should be noted that, in the above process, the critical outdoor temperature is-5 degrees, that is, when the outdoor temperature is lower than-5 degrees, the enthalpy increasing loop is opened, and the low-pressure and low-temperature refrigerant after being depressurized by the electronic expansion valve is properly preheated to reach a proper medium pressure, and then is supplied to the compressor 2 for secondary compression. The critical temperature may be other values.
The application has at least the following advantages:
1. by means of the expansion device, automatic adjustment in a large temperature range can be achieved.
2. The system can stably operate in the cold weather in the north, and is not influenced by the low-temperature severe environment.
3. The device can realize the high COP (coefficient of performance of circulation) value of the system in a large temperature range, and the whole system can run efficiently and save energy at the same time.
4. The device has low operation cost and simpler control.
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 the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A carbon dioxide heat pump with an enhanced vapor injection loop for use in extremely cold weather is characterized by comprising an indoor heat exchanger, an expansion device, a heat regenerator, a gas-liquid separator, a controller and a compressor, wherein an inlet of the indoor heat exchanger is connected with an outlet of the compressor, and a main loop and an enhanced vapor loop are arranged between an outlet of the indoor heat exchanger and the compressor in parallel; said expansion device being connected in series with said main circuit; a main capillary tube and an outdoor heat exchanger are sequentially connected between the expansion device and the compressor;
the expansion device comprises a first auxiliary capillary tube, a second auxiliary capillary tube and a control capillary tube electromagnetic valve;
the second end of the first auxiliary capillary and the first end of the second auxiliary capillary are connected; a first end of the first auxiliary capillary tube is connected with a second end of the second auxiliary capillary tube, a branch is arranged between the second end of the first auxiliary capillary tube and the second end of the second auxiliary capillary tube, and a control capillary tube electromagnetic valve is arranged on the branch;
a one-way valve is arranged between the first end of the first auxiliary capillary and the branch;
the regenerator comprises a first inlet, a second inlet, a first outlet and a second outlet, the main loop flows in from the first inlet and flows out from the first outlet, and the enthalpy-increasing loop flows in from the second inlet and flows out from the second outlet; the second inlet is connected to a first end of the first auxiliary capillary tube, and a second end of the second auxiliary capillary tube is connected to the compressor;
The enthalpy-increasing loop comprises an enthalpy-increasing loop electromagnetic valve and an expander; one end of the enthalpy-increasing loop electromagnetic valve is connected with the indoor heat exchanger, the other end of the enthalpy-increasing loop electromagnetic valve is connected with one end of the expander, and the other end of the expander is connected with the first inlet;
a filter is arranged between the main capillary tube and the outdoor heat exchanger; the gas-liquid separator is arranged on the main loop and is positioned between the outdoor heat exchanger and the compressor; a four-way valve is arranged between the gas-liquid separator and the outdoor heat exchanger;
an electromagnetic valve is arranged between a starting point of the parallel connection of the main loop and the enthalpy-increasing loop and the indoor heat exchanger; a bidirectional expander is arranged between the inlet of the indoor heat exchanger and the outlet of the compressor;
the control capillary solenoid valve, the enthalpy-increasing loop solenoid valve and the solenoid valve are all communicated with the controller;
the carbon dioxide heat pump for the enhanced vapor injection loop in the extremely cold weather comprises the following working processes:
when heating in winter, the high-pressure refrigerant steam discharged by the compressor flows into the indoor heat exchanger after passing through the four-way valve, the heat is released when the refrigerant steam is condensed, the indoor air is heated, the indoor heating purpose is achieved, and then the refrigerant coming out of the indoor heat exchanger can be divided into two situations:
In the first case: when the system heats at the temperature higher than-5 ℃, the capillary electromagnetic valve is controlled to be opened, the control electromagnetic valve is a normally open electromagnetic valve, the enthalpy-increasing loop electromagnetic valve is closed, and the enthalpy-increasing loop electromagnetic valve is a normally closed electromagnetic valve; the refrigerant coming out of the indoor heat exchanger directly enters the heat regenerator, then passes through the first auxiliary capillary tube loop, then enters the filter through the main capillary tube, the filtered refrigerant enters the outdoor heat exchanger, the evaporated steam enters the gas-liquid separator after passing through the four-way valve again, and finally is sucked by the compressor, so that the heating cycle is completed;
in the second case: when the system heats at the temperature lower than-5 ℃, the capillary tube electromagnetic valve is controlled to be closed, the enthalpy-increasing loop electromagnetic valve is controlled to be opened, the refrigerant coming out of the indoor heat exchanger enters the heat regenerator through the expander, a small part of the refrigerant coming out of the heat regenerator directly returns to the compressor again to supplement the refrigerant gas, so that the displacement of the compressor is increased, the amount of the circulating refrigerant heated by the heat exchanger of the indoor unit is increased, and the heating capacity is increased; meanwhile, part of the refrigerant from the heat regenerator passes through the first auxiliary capillary tube and the second auxiliary capillary tube, namely, the two capillary tubes are connected into a loop at the moment; and then the refrigerant enters a filter through a main capillary tube, the filtered refrigerant enters an outdoor heat exchanger, the evaporated steam enters a gas-liquid separator after passing through a four-way valve again, and finally the steam is sucked by a compressor to finish the heating cycle.
2. The carbon dioxide heat pump for an arctic weather lower band enhanced vapor injection circuit of claim 1, wherein the refrigerant is carbon dioxide.
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| CN106595142A (en) | 2017-04-26 |
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