CN108759151B - Evaporation cooling low temperature type air-cooled heat pump unit - Google Patents
Evaporation cooling low temperature type air-cooled heat pump unit Download PDFInfo
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- CN108759151B CN108759151B CN201810587528.1A CN201810587528A CN108759151B CN 108759151 B CN108759151 B CN 108759151B CN 201810587528 A CN201810587528 A CN 201810587528A CN 108759151 B CN108759151 B CN 108759151B
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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
- F25B39/00—Evaporators; Condensers
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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
- F25B41/40—Fluid line arrangements
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Abstract
The invention provides an evaporative cooling low-temperature type air-cooled heat pump unit, which comprises a low-temperature enhanced vapor injection compressor and a first heat exchange part; the low-temperature enhanced vapor injection compressor comprises two refrigerating medium return ports, the first heat exchange portion comprises an air cooling heat exchanger and a fan which enables air to flow through the surface of the air cooling heat exchanger, and the low-temperature enhanced vapor injection compressor further comprises an evaporative cooling heat exchanger and a spraying assembly which sprays cooling water to the surface of the evaporative cooling heat exchanger. The evaporative cooling low-temperature air-cooled heat pump unit can be in a cooperative working state of cooperative work of the air-cooled heat exchanger and the evaporative cooling heat exchanger in a heating mode and a cooling mode, has larger evaporation area and condensation area compared with the existing air-cooled heat pump unit and the existing evaporative cooling heat pump unit, thereby having higher heating efficiency and refrigeration efficiency, and two refrigeration medium backflow ports are simultaneously started in the heating mode, thereby being capable of efficiently heating in the outdoor environment as low as-25 ℃. In addition, the evaporative cooling low-temperature air-cooled heat pump unit is reasonable in layout and compact in overall structure.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to an evaporative cooling low-temperature air-cooled heat pump unit.
Background
At present, the air conditioning unit mainly has the following three cooling modes:
the air cooling mode is that air and a refrigerating medium are utilized for heat exchange;
the water cooling mode utilizes cooling water and a refrigerating medium, and the cooling water and the refrigerating medium both flow in the condenser.
The evaporative cooling mode is also characterized in that cooling water is utilized to exchange heat with a refrigerating medium, and different from the water cooling mode, the evaporative cooling mode is that the cooling water is directly sprayed on the surface of a condenser, and latent heat of vaporization of water is utilized to take away heat.
Among the three cooling modes, the same cooling capacity is obtained in the cooling mode in summer, and the energy consumption of the unit (evaporation cooling unit) adopting the evaporation cooling mode is the lowest. Generally, the same cooling capacity is obtained, and the evaporation cooling unit saves energy by more than 30% compared with a unit adopting an air cooling mode (air cooling unit) and saves energy by more than 15% compared with a unit adopting a water cooling mode (water cooling unit).
Among them, the water chiller is generally designed as a single chiller that only refrigerates but not heats.
The evaporative cooling unit has significant advantages in refrigeration, but when the evaporative cooling unit is designed as a heat pump unit capable of refrigerating and heating, the following two disadvantages exist:
on one hand, the evaporation cooling unit takes 'condensation heat' released from saturated water vapor in air absorbed by cooling water as a heat source in a winter heating mode, so that the heat exchange efficiency is very low, and the energy consumption of the evaporation cooling unit in the winter heating mode is high.
On the other hand, as the freezing point of the cooling water is 0 ℃, when the ambient temperature is lower than 0 ℃, the cooling water is sprayed to the surface of the condenser and is frozen, so that normal heat exchange with a refrigerating medium cannot be generated, the evaporation refrigerating unit can normally heat only in an area with the ambient temperature of more than 0 ℃, and cannot heat in an area with the ambient temperature of less than 0 ℃.
The air cooling unit is not limited by the environmental temperature in the aspect of heating, so that the heat pump unit is usually an air cooling unit in the industry, but the air cooling unit has higher energy consumption in the aspect of refrigeration.
From the above analysis, at present, the air cooling unit, the water cooling unit and the evaporation cooling unit in the industry cannot meet the requirements of high-efficiency refrigeration and high-efficiency heating (especially below 0 ℃), and how to develop a heat pump unit to enable the heat pump unit to efficiently refrigerate and heat and still efficiently heat below 0 ℃) is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to solve the technical problems, the invention provides an evaporation-cooling low-temperature air-cooled heat pump unit which comprises a low-temperature enhanced vapor injection compressor, a three-position four-way valve, a first heat exchange part, a first one-way valve, a liquid storage device, a drying filter, a first expansion valve, a second one-way valve, a third one-way valve, a second heat exchanger, a fourth one-way valve, a gas-liquid separator, a third electromagnetic valve, a second expansion valve, an economizer and a fan coil;
the first heat exchange part comprises an air-cooled heat exchanger, a fan for enabling air to flow through the surface of the air-cooled heat exchanger, an evaporative cold heat exchanger and a spraying assembly for spraying cooling water to the surface of the evaporative cold heat exchanger; the low-temperature enhanced vapor injection compressor is provided with a first refrigeration medium reflux port, a second refrigeration medium reflux port and a refrigeration medium outflow port; the economizer comprises a port A, a port B, a port C and a port D, wherein the port A and the port B are communicated with each other; the second heat exchanger is provided with a circulating water inlet and a circulating water outlet;
the refrigerating medium outlet is connected with the air-cooled heat exchanger and the evaporative cooling heat exchanger through the three-position four-way valve; the air-cooled heat exchanger and the evaporative cooling heat exchanger are connected with the liquid storage device through the first one-way valve; the liquid storage device is connected with the drying filter; the drying filter is connected with the port D and is also connected with the port A through the third electromagnetic valve and the second expansion valve; the port B is connected with the second refrigeration medium reflux port; the port C is connected with the first expansion valve; the first expansion valve is connected with the second heat exchanger through the second one-way valve; the second heat exchanger is connected with the gas-liquid separator through the three-position four-way valve, and a circulating water inlet and a circulating water outlet of the second heat exchanger are connected with the fan coil; the gas-liquid separator is connected with the first refrigeration medium reflux port; the second heat exchanger is also connected with the liquid storage device through the fourth one-way valve; the first expansion valve is also connected with the air-cooled heat exchanger and the evaporative cooling heat exchanger through the third one-way valve.
When the evaporative cooling low-temperature air-cooled heat pump unit is in a winter heating mode, the evaporative cooling low-temperature air-cooled heat pump unit can be in an independent air-cooled working state in which only the air-cooled heat exchanger works and the evaporative cooling heat exchanger does not work or in a cooperative working state in which the air-cooled heat exchanger and the evaporative cooling heat exchanger work cooperatively (the spraying component stops spraying). In the independent evaporation cold working state, the problem that cooling water is frozen and heating cannot be carried out is solved, so that heating can be carried out at the temperature of below 0 ℃. In a cooperative working state (the spraying component stops spraying), a refrigerating medium firstly enters the air-cooled heat exchanger for preliminary temperature rise and then enters the evaporative-cooled heat exchanger for secondary temperature rise, so that compared with the existing air-cooled unit and the evaporative-cooled unit, the refrigerating unit has larger evaporation area and higher heating efficiency, and the problem that the cooling water is frozen and cannot be heated is avoided, so that the high-efficiency heating can be realized at the temperature below 0 ℃. And the low-temperature enhanced vapor injection compressor and the corresponding communication pipeline are arranged, so that the evaporative cooling low-temperature air-cooled heat pump unit can still keep high-efficiency heating in an outdoor environment with the temperature as low as-25 ℃.
And when the evaporative cooling low-temperature type air-cooled heat pump unit is in a summer refrigeration mode, the evaporative cooling low-temperature type air-cooled heat pump unit can be in an independent evaporative cooling working state in which only the evaporative cooling heat exchanger works and the air-cooled heat exchanger does not work or a cooperative working state in which the air-cooled heat exchanger and the evaporative cooling heat exchanger work cooperatively (the spraying component starts spraying). In the independent evaporation cooling working state, the evaporation and evaporation of water are utilized to cool and condense the refrigeration medium, so that the air-cooled chiller has higher refrigeration efficiency compared with the existing air-cooled unit; in a cooperative working state, the refrigerating medium firstly enters the evaporation heat exchanger for primary cooling and then enters the air cooling heat exchanger for secondary cooling, so that the refrigerating medium has larger condensation area and higher refrigerating efficiency compared with the existing air cooling unit and the evaporation cooling unit.
Optionally, the air-cooled heat exchanger and the evaporative-cooled heat exchanger are arranged in parallel; and a first electromagnetic valve is arranged on a branch of the air-cooled heat exchanger, and a second electromagnetic valve is arranged on a branch of the evaporative cooling heat exchanger.
Optionally, the air-cooled heat exchanger and the evaporative-cooled heat exchanger are arranged in series; and a first electromagnetic valve is arranged between the air-cooled heat exchanger and the evaporative cooling heat exchanger, and the air-cooled heat exchanger and the first electromagnetic valve are connected in parallel with a second electromagnetic valve.
Optionally, the air-cooled heat exchanger is a fin-type heat exchanger, and the evaporative cooling heat exchanger is a plate-tube heat exchanger.
Optionally, the spray assembly includes a spray tank, a spray water pump, a spray pipe section provided with a nozzle, and a communication pipe section communicating the spray water pump and the spray pipe section.
Optionally, the evaporative cooling low temperature type air-cooled heat pump unit further comprises an outdoor unit housing, and two partition plates and a bottom plate located in the outdoor unit housing, wherein the two partition plates, the bottom plate and a top wall, a front wall and a rear wall of the outdoor unit housing jointly enclose a first accommodating cavity; the air-cooled heat exchanger and the evaporative cooling heat exchanger are both positioned in the first accommodating cavity, and the air-cooled heat exchanger is positioned above the evaporative cooling heat exchanger; the upper parts of the front wall and the rear wall are provided with air inlets, and the lower parts of the two partition plates are provided with air outlets.
Optionally, the spray pipe section is also arranged in the first accommodating cavity and is positioned between the air-cooled heat exchanger and the evaporative-cooled heat exchanger; the evaporative cooling low-temperature air-cooled heat pump unit further comprises an air filter, wherein the air filter is also arranged in the first accommodating cavity and is positioned between the air-cooled heat exchanger and the spraying pipe section.
Optionally, the outdoor unit casing includes a frame, and a guard plate and a grid plate provided on the frame, and the air inlet is formed through the grid plate.
Optionally, the left side of one partition and the right side of the other partition are both provided with an air duct; the two air ducts are communicated with the first accommodating cavity through the air outlets on the corresponding sides; outlets of the two air channels are formed on the top wall of the outdoor unit housing, and the fans are arranged at the outlets of the two air channels.
Optionally, water collectors for collecting moisture in the air are arranged in both the air ducts, and water collected by the water collectors falls back to the spray water tank.
Drawings
FIG. 1 is a schematic view of an overall flow of a first embodiment of an evaporative cooling low temperature type air-cooled heat pump unit according to the present invention;
FIG. 2 is a schematic view of the overall flow of a second embodiment of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention;
FIG. 3 is a schematic view illustrating the operation of the first embodiment in the winter heating mode;
FIG. 4 is a schematic diagram illustrating the operation of the first embodiment in the cooling mode in summer;
FIG. 5 is a partial cross-sectional view of the evaporative cooling low temperature type air-cooled heat pump unit of the present invention at a front view;
FIG. 6 is a full sectional view of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention at a main viewing angle;
FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 5 of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention
FIG. 8 is a top view of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention.
The reference numerals in fig. 1 to 8 are explained as follows:
1 low-temperature air injection enthalpy-increasing compressor, E first refrigeration medium return port, F second refrigeration medium return port, G refrigeration medium outlet port, 3 three-position four-way valve, 4 first heat exchanging part, 41 air-cooled heat exchanger, 42 evaporative cooling heat exchanger, 43 fan, 44 spray water tank, 45 spray water pump, 46 communicating pipe section, 47 spray pipe section, 48 first solenoid valve, 49 second solenoid valve, 5 first check valve, 6 liquid storage device, 7 drying filter, 8 first expansion valve, 9 second check valve, 10 third check valve, 11 second heat exchanger, 12 fourth check valve, 13 gas-liquid separator, 14 third solenoid valve, 15 second expansion valve, 16 economizer, 17 fan coil, 18 water receiver, 19 outdoor unit housing, 191 frame, 192 guard plate, 193 grid plate, 20 partition plate, 201 air outlet, 21 bottom plate, a first accommodating cavity, b, 22 air duct filter.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a schematic overall flow chart of a first embodiment of an evaporative cooling low temperature type air-cooled heat pump unit provided in the present invention; FIG. 2 is a schematic view of the overall flow of a second embodiment of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention; FIG. 3 is a schematic view illustrating the operation of the first embodiment in the winter heating mode; fig. 4 is a schematic diagram of the working process of the first embodiment in the cooling mode in summer.
As shown in fig. 1 to 4, the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention includes a first heat exchanging portion 4, the first heat exchanging portion 4 includes an air-cooled heat exchanger 41 and an evaporative cooling heat exchanger 42, and a refrigeration medium of the evaporative cooling low temperature type air-cooled heat pump unit flows inside the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42.
The first heat exchanging part 4 further includes a fan 43 for passing air over the surface of the air-cooled heat exchanger 41 and a spray unit for spraying cooling water onto the surface of the evaporative cold heat exchanger 42.
The following specifically describes the connection mode of the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 and the working state of the evaporative cooling low temperature air-cooled heat pump unit under each connection mode:
specifically, as shown in fig. 1, in the first embodiment, the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 are connected in parallel, and a first electromagnetic valve 48 is disposed in a branch of the air-cooled heat exchanger 41, and a second electromagnetic valve 49 is disposed in a branch of the evaporative cooling heat exchanger 42.
The evaporation cooling low-temperature type air-cooled heat pump unit in the embodiment can realize the following two working states:
one is an independent air cooling working state. In this operating state, the first solenoid valve 48 is opened, the second solenoid valve 49 is closed, the blower 43 is started, and the shower assembly stops spraying. At this time, the refrigerant flows through the inside of the air-cooled heat exchanger 41, exchanges heat with the air flowing over the surface of the air-cooled heat exchanger 41, and does not flow through the inside of the evaporative cooling heat exchanger 42. At this time, the air-cooled heat exchanger 41 is in an operating state, and the evaporative cooling heat exchanger 42 is in a non-operating state.
The other is an independent evaporation cold working state. In this operating state, the first solenoid valve 48 is closed, the second solenoid valve 49 is opened, the blower 43 is started, and the shower assembly starts spraying. At this time, the refrigerant flows through the inside of the evaporative cooling heat exchanger 42, exchanges heat with the cooling water sprayed to the surface of the evaporative cooling heat exchanger 42, and does not flow through the inside of the air-cooled heat exchanger 41. At this time, the evaporative cooling heat exchanger 42 is in the evaporative cooling operation state, and the air-cooled heat exchanger 41 is in the non-operation state.
Specifically, as shown in fig. 2, in the second embodiment, the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 are connected in series, and a first solenoid valve 48 ' is disposed between the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42, and the air-cooled heat exchanger 41 and the first solenoid valve 48 ' are connected in parallel to a second solenoid valve 49 '.
The evaporation cooling low-temperature type air-cooled heat pump unit in the embodiment can realize the following two working states:
one is an independent evaporation cold working state. In this operating state, the first solenoid valve 48 'is closed, the second solenoid valve 49' is opened, the fan 43 is started, and the spraying assembly starts spraying. At this time, the refrigerant flows through the inside of the evaporative cooling heat exchanger 42, exchanges heat with the cooling water sprayed to the surface of the evaporative cooling heat exchanger 42, and does not flow through the inside of the air-cooled heat exchanger 41. At this time, the evaporative cooling heat exchanger 42 is in the evaporative cooling operation state, and the air-cooled heat exchanger 41 is in the non-operation state.
The other is a cooperative working state. In this operating condition, the first solenoid valve 48 'is open, the second solenoid valve 49' is closed and the fan 43 is activated, on the basis of which:
if in the cooling mode, the spraying assembly is started to spray, at this time, the cooling medium flows through the inside of the air-cooled heat exchanger 41 to exchange heat with the air flowing through the surface of the air-cooled heat exchanger 41, and also flows through the inside of the evaporative cooling heat exchanger 42 to exchange heat with the cooling water flowing through the surface of the evaporative cooling heat exchanger 42, at this time, the air-cooled heat exchanger 41 is in a working state, and the evaporative cooling heat exchanger 42 is in an evaporative water-cooling working state.
If in the heating mode, the spraying component stops spraying, at this time, the cooling medium flows through the inside of the air-cooled heat exchanger 41 to exchange heat with the air flowing through the surface of the air-cooled heat exchanger 41, and also flows through the inside of the evaporative cooling heat exchanger 42 to exchange heat with the air flowing through the surface of the evaporative cooling heat exchanger 42, at this time, the air-cooled heat exchanger 41 is in a working state, and the evaporative cooling heat exchanger 42 is in an air-cooled working state.
The following specifically describes the working states of the evaporative cooling low-temperature air-cooled heat pump unit in the summer cooling mode and the winter heating mode respectively:
when the evaporative cooling low-temperature air-cooled heat pump unit is in a winter heating mode, the evaporative cooling low-temperature air-cooled heat pump unit can be in an independent air-cooled working state in which only the air-cooled heat exchanger works and the evaporative cooling heat exchanger does not work or in a cooperative working state in which the air-cooled heat exchanger and the evaporative cooling heat exchanger work cooperatively (the spraying component stops spraying). Generally speaking, in the heating mode in winter, the evaporative cooling low temperature air-cooled heat pump unit uses the air-cooled heat exchanger 41 as the main heat exchanger and the evaporative cooling heat exchanger 42 as the auxiliary heat exchanger.
In the independent evaporation cold working state, the problem that cooling water is frozen and heating cannot be carried out is solved, so that heating can be carried out at the temperature of below 0 ℃. In a cooperative working state (the spraying component stops spraying), a refrigerating medium firstly enters the air-cooled heat exchanger for preliminary temperature rise and then enters the evaporative-cooled heat exchanger for secondary temperature rise, so that compared with the existing air-cooled unit and the evaporative-cooled unit, the refrigerating unit has larger evaporation area and higher heating efficiency, and the problem that the cooling water is frozen and cannot be heated is avoided, so that the high-efficiency heating can be realized at the temperature below 0 ℃.
When the evaporative cooling low-temperature type air-cooled heat pump unit is in a summer refrigeration mode, the evaporative cooling low-temperature type air-cooled heat pump unit can be in an independent evaporative cooling working state in which only the evaporative cooling heat exchanger works and the air-cooled heat exchanger does not work or a cooperative working state in which the air-cooled heat exchanger and the evaporative cooling heat exchanger work cooperatively (the spraying component starts spraying). Generally speaking, in the refrigeration mode in summer, the evaporative cooling low temperature type air-cooled heat pump unit uses the evaporative cooling heat exchanger 42 as the main heat exchanger and the air-cooled heat exchanger 41 as the auxiliary heat exchanger.
In the independent evaporation cooling working state, the evaporation and evaporation of water are utilized to cool and condense the refrigeration medium, so that the air-cooled chiller has higher refrigeration efficiency compared with the existing air-cooled unit; in a cooperative working state (the spraying component starts spraying), the refrigerating medium firstly enters the evaporation heat exchanger for preliminary cooling and then enters the air-cooled heat exchanger for secondary cooling, so that the refrigerating machine set has larger condensing area and higher refrigerating efficiency compared with the existing air-cooled machine set and the evaporation heat exchanger.
The component composition, connection relationship and working flow under the cooling and heating mode of the evaporative cooling low temperature type air-cooled heat pump unit are explained in detail as follows:
as shown in fig. 1 to 4, the spray assembly of the first heat exchanging part 4 includes a spray water tank 44, a spray water pump 45, a spray pipe section 47, and a communication pipe section 46, a ball float valve, an overflow port, etc. for communicating the spray water pump 45 and the spray pipe section 47. Specifically, the air-cooled heat exchanger 41 may be a fin-type heat exchanger; the evaporative cooling heat exchanger 42 may be a plate-and-tube (plate) type heat exchanger that is less prone to fouling.
As shown in fig. 1 to 4, the evaporative cooling low temperature air-cooled heat pump unit includes, in addition to the first heat exchanging portion 4, a low temperature enhanced vapor injection compressor 1, a three-position four-way valve 3, a first check valve 5, a liquid reservoir 6, a drying filter 7, a first expansion valve 8, a second check valve 9, a third check valve 10, a second heat exchanger 11, a fourth check valve 12, a gas-liquid separator 13, a third solenoid valve 14, a second expansion valve 15, an economizer 16, a fan coil 17 located on the indoor side, and other components located on the indoor side (including indoor side control components and the like).
The above components are configured and connected as follows:
the low-temperature enhanced vapor injection compressor 1 is provided with a first refrigerating medium return port E, a second refrigerating medium return port F and a refrigerating medium outflow port G; the economizer 16 comprises a port A and a port B which are communicated with each other, and a port C and a port D which are communicated with each other; the second heat exchanger (11) is provided with a circulating water inlet and a circulating water outlet.
Wherein, the refrigerating medium outlet G is connected with the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 through the three-position four-way valve 3; the air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 are connected with the liquid storage device 6 through the first one-way valve 5; the liquid storage device 6 is connected with the drying filter 7; the drying filter 7 is connected with the port D and is also connected with the port A through a third electromagnetic valve 14 and a second expansion valve 15; the port B is connected with a second refrigeration medium reflux port F; the port C is connected with a first expansion valve 8; the first expansion valve 8 is connected with a second heat exchanger 11 through a second one-way valve 9; the second heat exchanger 11 is connected with a gas-liquid separator 13 through a three-position four-way valve 3, and the inlet and outlet of circulating water are connected with a fan coil 17; the gas-liquid separator 13 is connected with the first refrigeration medium reflux opening E; the second heat exchanger 11 is also connected with the liquid storage device 6 through a fourth one-way valve 12; the first expansion valve 8 is also connected to the air-cooled heat exchanger 41 and the evaporation-cooled heat exchanger 42 through the third check valve 10.
As shown in fig. 3, in the heating mode in winter, if the ambient temperature is low, the third electromagnetic valve 14 is opened, and at this time, the flow path of the refrigerant is shown by the arrow line in fig. 3: the refrigerant outlet G of the low-temperature enhanced vapor injection compressor 1 → the three-position four-way valve 3 → the second heat exchanger 11 → the fourth one-way valve 12 → the accumulator 6 → the filter drier 7, and then is divided into two paths.
The first path is as follows: the third solenoid valve 14 → the second expansion valve 15 → the port a of the economizer 16 → the port B of the economizer 16 → the second refrigerant medium reflux port F of the low-temperature enhanced vapor injection compressor 1. The second path is: the D port of the economizer 16 → the C port of the economizer 16 → the first expansion valve 8 → the third check valve 10 → the air-cooled heat exchanger 41 and/or the evaporative cold heat exchanger 42 → the three-position four-way valve 3 → the gas-liquid separator 13 → the first refrigerant medium reflux port E of the low-temperature enhanced vapor injection compressor 1. The refrigeration media in the two paths are subjected to heat exchange with each other in the economizer 16 and then flow back to the low-temperature enhanced vapor injection compressor 1 for compression. By the arrangement, the heat pump unit can still efficiently heat in an outdoor environment with the temperature as low as-25 ℃.
As shown in fig. 4, the evaporative cooling low temperature air-cooled heat pump unit can close the third electromagnetic valve 14 in the summer cooling mode, and the flow path of the cooling medium is shown by the arrow line in fig. 4: the refrigerant outlet G of the low-temperature enhanced vapor injection compressor 1 → the three-position four-way valve 3 → the air-cooled heat exchanger 41 and/or the evaporative cold heat exchanger 42 → the first check valve 5 → the accumulator 6 → the filter drier 7 → the D port of the economizer 16 → the C port of the economizer 16 → the first expansion valve 8 → the second check valve 9 → the second heat exchanger 11 → the three-position four-way valve 3 → the gas-liquid separator 13 → the first refrigerant return port E of the low-temperature enhanced vapor injection compressor 1. Of course, in the summer cooling mode, the third electromagnetic valve 14 may not be closed.
And, circulating water flows in the second heat exchanger 11, the circulating water exchanges heat with the refrigerant, and then the circulating water flows into the fan coil 17 from the second heat exchanger 11, exchanges heat with the air flowing through the fan coil 17, and then the circulating water flows back to the second heat exchanger 11.
Besides the above components, the evaporative cooling low-temperature air-cooled heat pump unit further comprises an electric control component, and specifically comprises a pressure sensor, a temperature sensor, a pressure switch, a temperature switch, a wire, a cable, an electric control box body, a relay, a contactor, a PLC microcomputer board and the like, wherein the relay, the contactor, the PLC microcomputer board and the like are positioned in the electric control box body.
The following specifically describes the arrangement positions of the components of the evaporative cooling low temperature type air-cooled heat pump unit, please refer to fig. 5-8, fig. 5 is a partial sectional view of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention in a front view; FIG. 6 is a full sectional view of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention at a main viewing angle; FIG. 7 is a sectional view taken along the direction A-A in FIG. 5 of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention; FIG. 8 is a top view of the evaporative cooling low temperature type air-cooled heat pump unit provided by the present invention.
As shown in fig. 5-8, the evaporative cooling low temperature heat pump unit further includes an outdoor unit casing 19, two partition boards 20 and a bottom board 21 are disposed in the outdoor unit casing 19, and the two partition boards 20 and the bottom board 21 and the top wall, the front wall and the rear wall of the outdoor unit casing 19 jointly enclose a first accommodating cavity a.
The air-cooled heat exchanger 41 and the evaporative cooling heat exchanger 42 are both located in the first housing chamber a. The air-cooled heat exchanger 41 is located above the evaporative-cooled heat exchanger 42; and, the upper portions of the antetheca and the back wall of first chamber a that holds all are provided with the air intake, and the lower part of the left side wall and the right side wall of first chamber a that holds all sets up air outlet 201.
Specifically, as shown in fig. 5, the outdoor unit casing 19 includes a frame 191, and a guard plate 192 and a grid plate 193 which are disposed on the frame 191, and the air inlet is formed through the grid plate 193.
Specifically, as shown in fig. 7, the air-cooled heat exchanger 41 may be configured as a V-fin heat exchanger. And the two side surfaces of the V-shaped part face the air inlet, the bottom surface of the V-shaped part faces downwards, the pointed top faces upwards, and the whole part is in an inverted V shape.
Specifically, the shower pipe section 47 is also disposed in the first accommodating chamber a, and is located between the air-cooled heat exchanger 41 and the evaporative-cooled heat exchanger 42. And, the evaporation cold low temperature type air-cooled heat pump unit also includes air cleaner 22 for filtering the impurity in the air, this air cleaner 22 also sets up in first holding chamber a, and it is located between air-cooled heat exchanger 41 and shower section 47.
Further, as shown in fig. 6, the left side of the partition plate 20 on the left side and the right side of the partition plate 20 on the right side are respectively provided with an air duct b, that is, the left side and the right side of the first accommodating chamber a are respectively provided with an air duct b. And, left wind channel b holds chamber a intercommunication through left air outlet 201 with first, and right wind channel b holds chamber a intercommunication through right air outlet 201 with first. As shown in fig. 8, outlets of the two air ducts b are formed on a top wall of the outdoor unit casing 19, and fans 43 are disposed in the two air ducts b, and the fans 43 are located near the outlets of the air ducts b.
Specifically, the two air ducts b are both provided with water collectors 18 for collecting moisture in the air, and water collected by the water collectors 18 falls back to the spray water tank 44 to reduce the loss of cooling water.
More specifically, the spray water tank 44 is disposed below the first receiving chamber a and the air duct b, and as shown in fig. 6, when the spray water tank 44 is disposed at a position shifted to the left, the right side of the bottom plate 21 is inclined upward. At this time, the water collected by the left water collector 18 may directly fall into the spray water tank 44, and the water collected by the right water collector 18 may be introduced into the spray water tank 44 through the bottom plate 21. And, the spray water pump 45 is directly provided in the spray water tank 44 so as to save space.
Specifically, other outdoor components of the evaporative cooling low-temperature air-cooled heat pump unit are also arranged below the first accommodating cavity a and the air duct b, and are arranged at positions on the right side as shown in fig. 6.
When the above arrangement is adopted, as shown by the arrow lines in fig. 5 and 6, under the action of the fan 43, the air enters the first accommodating cavity a from the grid plate 193, then flows through the surface of the air-cooled heat exchanger 41 located above, then flows through the surface of the evaporation-cooled heat exchanger 42, and then flows from the air outlets 201 on both sides to the air duct b on the corresponding side, and is discharged from the outlet of the air duct b. When the evaporative cooling low temperature type air-cooled heat pump unit is in a cooperative working state, the air entering the first accommodating cavity a firstly exchanges heat with the refrigeration medium flowing through the inside of the air-cooled heat exchanger 41 for the first time, and then exchanges heat with the refrigeration medium flowing through the inside of the evaporative cooling heat exchanger 42 for the second time
In summary, the evaporative cooling low temperature type air-cooled heat pump unit provided by the invention has the following technical effects:
1. the refrigeration and heating device can efficiently refrigerate and heat.
2. Can efficiently heat at the ambient temperature of-25 ℃ to 0 ℃, thereby having wider application
The application region (can also be used in northeast China) of China, and is convenient for popularization.
3. Reasonable arrangement of all parts, compact integral structure, and convenient saving of evaporative cooling low-temperature air
And the construction cost of the arrangement space of the cold and hot pump unit.
The evaporative cooling low-temperature air-cooled heat pump unit provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. An evaporation cooling low-temperature air-cooled heat pump unit is characterized by comprising a low-temperature enhanced vapor injection compressor (1), a three-position four-way valve (3), a first heat exchange part (4), a first one-way valve (5), a liquid storage device (6), a drying filter (7), a first expansion valve (8), a second one-way valve (9), a third one-way valve (10), a second heat exchanger (11), a fourth one-way valve (12), a gas-liquid separator (13), a third electromagnetic valve (14), a second expansion valve (15), an economizer (16) and a fan coil (17);
the first heat exchanging part (4) comprises an air-cooled heat exchanger (41) and a fan (43) which enables air to flow through the surface of the air-cooled heat exchanger (41), and also comprises an evaporative cold heat exchanger (42) and a spraying assembly which sprays cooling water to the surface of the evaporative cold heat exchanger (42); the low-temperature enhanced vapor injection compressor (1) is provided with a first refrigerating medium return port (E), a second refrigerating medium return port (F) and a refrigerating medium outflow port (G); the economizer (16) comprises a port A and a port B which are communicated with each other, and a port C and a port D which are communicated with each other; the second heat exchanger (11) is provided with a circulating water inlet and a circulating water outlet;
the refrigerating medium outlet (G) is connected with the air-cooled heat exchanger (41) and the evaporative cooling heat exchanger (42) through the three-position four-way valve (3); the air-cooled heat exchanger (41) and the evaporative-cooled heat exchanger (42) are connected with the liquid storage device (6) through the first one-way valve (5); the liquid storage device (6) is connected with the drying filter (7); the drying filter (7) is connected with the port D and is also connected with the port A through the third electromagnetic valve (14) and the second expansion valve (15); the port B is connected with the second refrigeration medium reflux port (F); the port C is connected with the first expansion valve (8); the first expansion valve (8) is connected with the second heat exchanger (11) through the second one-way valve (9); the second heat exchanger (11) is connected with the gas-liquid separator (13) through the three-position four-way valve (3), and a circulating water inlet and a circulating water outlet of the second heat exchanger are connected with the fan coil (17); the gas-liquid separator (13) is connected with the first refrigeration medium reflux opening (E); the second heat exchanger (11) is also connected with the liquid storage device (6) through the fourth one-way valve (12); the first expansion valve (8) is also connected with the air-cooled heat exchanger (41) and the evaporative-cooled heat exchanger (42) through the third one-way valve (10);
when the evaporative cooling low-temperature air-cooled heat pump unit is in a winter heating mode, the evaporative cooling low-temperature air-cooled heat pump unit is in an independent air-cooled working state in which only the air-cooled heat exchanger (41) works and the evaporative cooling heat exchanger (42) does not work or in a cooperative working state in which the air-cooled heat exchanger (41) and the evaporative cooling heat exchanger (42) work cooperatively; when the spraying assembly is in a cooperative working state, the spraying assembly stops spraying;
when the evaporative cooling low-temperature type air-cooled heat pump unit is in a summer refrigeration mode, the evaporative cooling low-temperature type air-cooled heat pump unit is in an independent evaporative cooling working state that only the evaporative cooling heat exchanger (42) works and the air-cooled heat exchanger (41) does not work or in a cooperative working state that the air-cooled heat exchanger (41) and the evaporative cooling heat exchanger (42) work cooperatively; when the spraying assembly is in a cooperative working state, the spraying assembly starts spraying;
wherein:
the air-cooled heat exchanger (41) and the evaporative-cooled heat exchanger (42) are arranged in parallel; a first electromagnetic valve (48) is arranged on a branch path where the air-cooled heat exchanger (41) is located, and a second electromagnetic valve (49) is arranged on a branch path where the evaporative cooling heat exchanger (42) is located;
or:
the air-cooled heat exchanger (41) and the evaporative-cooled heat exchanger (42) are arranged in series; and a first electromagnetic valve (48 ') is arranged between the air cooling heat exchanger (41) and the evaporative cooling heat exchanger (42), and the air cooling heat exchanger (41) and the first electromagnetic valve (48 ') are connected in parallel with a second electromagnetic valve (49 ') together.
2. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 1, wherein the air-cooled heat exchanger (41) is a fin type heat exchanger, and the evaporative cooling heat exchanger (42) is a tube-in-plate heat exchanger.
3. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 1, wherein the spray assembly comprises a spray water tank (44), a spray water pump (45), a spray pipe section (47) provided with nozzles, and a communication pipe section (46) communicating the spray water pump (45) and the spray pipe section (47).
4. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 3, further comprising an outdoor unit casing (19) and two partition boards (20) and a bottom board (21) therein, wherein the two partition boards (20) and the bottom board (21) and the top wall, the front wall and the rear wall of the outdoor unit casing (19) together enclose a first accommodating chamber (a); the air-cooled heat exchanger (41) and the evaporative cold heat exchanger (42) are both positioned in the first accommodating cavity (a), and the air-cooled heat exchanger (41) is positioned above the evaporative cold heat exchanger (42); the upper portions of the front wall and the rear wall are provided with air inlets, and the lower portions of the two partition plates are provided with air outlets (201).
5. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 4, wherein the shower section (47) is also disposed in the first accommodating chamber (a) and between the air-cooled heat exchanger (41) and the evaporative cooling heat exchanger (42); the evaporative cooling low-temperature air-cooled heat pump unit further comprises an air filter (22), wherein the air filter (22) is also arranged in the first accommodating cavity (a) and is positioned between the air-cooled heat exchanger (41) and the spraying pipe section (47).
6. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 4, wherein the outdoor unit casing (19) comprises a frame (191) and a protector plate (192) and a grid plate (193) provided on the frame (191), and the air intake opening is formed by the grid plate (193).
7. The evaporative cooling low temperature type air-cooled heat pump unit as set forth in claim 4, wherein air ducts (b) are provided on both the left side of one of the partitions (20) and the right side of the other partition (20); the two air ducts (b) are communicated with the first accommodating cavity (a) through the air outlets (201) on the corresponding sides; outlets of the two air ducts (b) are formed on a top wall of the outdoor unit housing (19), and the fans (43) are disposed at the outlets of the two air ducts (b).
8. The evaporative cooling low temperature type air-cooled heat pump unit as claimed in claim 7, wherein a water collector (18) for collecting moisture in the air is arranged in each of the air ducts (b), and water collected by the water collector (18) falls back to the spray water tank (44).
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| CN201810587528.1A CN108759151B (en) | 2018-06-08 | 2018-06-08 | Evaporation cooling low temperature type air-cooled heat pump unit |
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| CN201810587528.1A CN108759151B (en) | 2018-06-08 | 2018-06-08 | Evaporation cooling low temperature type air-cooled heat pump unit |
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| CN108759151B true CN108759151B (en) | 2021-01-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111256383B (en) * | 2018-11-30 | 2021-11-05 | 深圳麦克维尔空调有限公司 | Composite heat exchanger and heat exchange system with same |
| CN112797661B (en) * | 2021-01-05 | 2023-05-26 | 青岛海尔空调电子有限公司 | Outdoor unit of heat pump unit, heat pump unit and air supply method thereof |
| CN112963981A (en) * | 2021-04-20 | 2021-06-15 | 埃能科技(广州)有限公司 | Heat pump set |
| CN113606659A (en) * | 2021-07-28 | 2021-11-05 | 珠海格力电器股份有限公司 | Heat exchange device, fan coil, air conditioner and control method of heat exchange device |
| CN114812001A (en) * | 2022-06-02 | 2022-07-29 | 广州市华德工业有限公司 | Indirect evaporation air source heat pump device and control method |
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| CN101929715A (en) * | 2009-06-18 | 2010-12-29 | 西安井上人工环境有限公司 | Effective energy-saving air-conditioning unit |
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| CN101929715A (en) * | 2009-06-18 | 2010-12-29 | 西安井上人工环境有限公司 | Effective energy-saving air-conditioning unit |
| CN203657257U (en) * | 2013-12-06 | 2014-06-18 | 南京恒标斯瑞冷冻机械制造有限公司 | Evaporative cooling type water chilling unit |
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