CN108954899B - Wet film type low temperature air-cooled heat pump multi-connected unit - Google Patents
Wet film type low temperature air-cooled heat pump multi-connected unit Download PDFInfo
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- CN108954899B CN108954899B CN201811142823.2A CN201811142823A CN108954899B CN 108954899 B CN108954899 B CN 108954899B CN 201811142823 A CN201811142823 A CN 201811142823A CN 108954899 B CN108954899 B CN 108954899B
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- 238000001816 cooling Methods 0.000 claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000003507 refrigerant Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000005507 spraying Methods 0.000 claims abstract description 33
- 239000000498 cooling water Substances 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005187 foaming Methods 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 238000005057 refrigeration Methods 0.000 abstract description 7
- 239000003570 air Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
-
- 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
-
- 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
- F25B41/31—Expansion valves
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
Abstract
The invention provides a wet film type low-temperature air-cooled heat pump multi-connected unit, wherein a main one-way valve controls the other end of an outdoor heat exchange unit to be communicated with a liquid reservoir, and an auxiliary one-way valve controls the other end of an indoor heat exchange unit to be communicated with the liquid reservoir; the indoor heat exchange unit is a multi-connected indoor unit or a shell-and-tube heat exchanger; the outdoor heat exchange unit includes: the device comprises a water-cooling heat exchanger, an air-cooling heat exchanger connected with the water-cooling heat exchanger, a fan for enabling air to flow through the air-cooling heat exchanger, a wet film heat exchanger, a spraying device for spraying cooling water to the wet film heat exchanger, a spraying water pump connected with the spraying device, a cooling water tank positioned below the wet film heat exchanger and supplying water to the spraying water pump, and a spraying pipeline for communicating the spraying device with the spraying water pump; the water cooling heat exchange pipeline of the water cooling heat exchanger is connected to the spray pipeline, and the refrigerant heat exchange pipeline of the water cooling heat exchanger is connected to the refrigerant pipeline of the wet film type low temperature air cooling heat pump multi-connected unit. The wet film type low-temperature air-cooled heat pump multi-connected unit provided by the invention realizes efficient refrigeration and heating operation.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a wet film type low-temperature air-cooled heat pump multi-connected unit.
Background
The current air conditioning cooling technology can be divided into three forms:
1. air cooling unit: the temperature difference between the cold steam in the condenser and the outdoor ambient air is utilized to liquefy the refrigerant through the fin heat exchanger so as to achieve the aim of reducing the temperature of the refrigerant, namely, the refrigerant is cooled by utilizing the heat exchange between the outdoor ambient air and the cold steam;
2. and (3) a water cooling unit: the cooling water obtained by the cooling tower is utilized to liquefy the cooling steam in the shell-and-tube (sleeve) type heat exchanger to achieve the aim of reducing the temperature of the refrigerant, wherein the cooling water and the cooling steam adopt a heat exchange mode to cool the refrigerant;
3. and an evaporative cooling unit: the condenser is exposed in the cooling tower, and the refrigerant steam is liquefied by vaporization and evaporation of water in a spray water mode to achieve the purpose of cooling, namely saturated steam cooling. The plate-tube type heat exchanger of the evaporative cooling unit is easy to scale, so that the heat exchange efficiency is reduced, the refrigerating efficiency of the unit is increased, and the plate-tube heat exchanger is severely corroded; and, heating (or heating efficiency is low) cannot be performed in an environment where the temperature is low (e.g., winter).
The multi-connected unit is used as an independent model in the air cooling unit, adopts the refrigerant to directly exchange heat without secondary heat exchange, and is the model with highest efficiency in the air cooling unit. The wet film type unit is a water cooling unit which combines a water cooling unit and a cooling tower into a whole and adopts a filling material and spraying mode similar to evaporative cooling.
The evaporative cooling can efficiently refrigerate, but the environment with lower temperature has low heating efficiency and serious scaling; the multi-connected heat pump can heat but has lower refrigerating efficiency in summer than an evaporative cooling unit; in addition, the traditional multi-split air conditioner has low efficiency in a low-temperature environment. The water cooling unit has good refrigerating effect, the space is wasted due to repeated construction of the machine room because of the need of adding a cooling tower to the machine room, the long investment of a cooling pipe network is high, the energy consumption of a cooling water pump is high, the cooling water consumption of the cooling tower is large, and the heating cannot be performed in winter.
Therefore, the multi-connected unit has lower refrigerating efficiency in summer than the evaporative cooling unit and the water cooling unit; the heating efficiency in winter is low and the use in low-temperature cold areas is limited.
Therefore, how to achieve the effect of efficient heating and cooling has become a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a wet film type low temperature air-cooled heat pump multi-connected unit to achieve the effect of high-efficiency refrigeration and heating.
A wet film type low temperature air-cooled heat pump multi-connected unit comprises a compressor, an outdoor heat exchange unit, a four-way valve, an indoor heat exchange unit, a liquid reservoir, a first expansion valve, a first electromagnetic valve, a second electromagnetic valve, a main unidirectional valve, an auxiliary unidirectional valve, a first unidirectional valve and a second unidirectional valve;
the compressor is provided with a return port and a discharge port; the first port A of the four-way valve is communicated with one end of the outdoor heat exchange unit, the second port B of the four-way valve is communicated with the reflux port, the third port C of the four-way valve is communicated with one end of the indoor heat exchange unit, and the fourth port D of the four-way valve is communicated with the outflow port; the main one-way valve controls the other end of the outdoor heat exchange unit to be communicated with the liquid storage device, and the auxiliary one-way valve controls the other end of the indoor heat exchange unit to be communicated with the liquid storage device; the liquid storage device is connected with the first expansion valve, the first expansion valve is communicated with the other end of the outdoor heat exchange unit through the first electromagnetic valve and the first one-way valve, and the first expansion valve is communicated with the other end of the indoor heat exchange unit through the second electromagnetic valve and the second one-way valve;
the indoor heat exchange unit is a multi-connected indoor unit or a shell-and-tube heat exchanger; the outdoor heat exchange unit includes: the device comprises a water-cooling heat exchanger, an air-cooling heat exchanger connected with the water-cooling heat exchanger, a fan for enabling air to flow through the air-cooling heat exchanger, a wet film heat exchanger, a spraying device for spraying cooling water to the wet film heat exchanger, a spraying water pump connected with the spraying device, a cooling water tank positioned below the wet film heat exchanger and used for supplying water to the spraying water pump, and a spraying pipeline for communicating the spraying device with the spraying water pump;
the water cooling heat exchange pipeline of the water cooling heat exchanger is connected to the spray pipeline, and the refrigerant heat exchange pipeline of the water cooling heat exchanger is connected to the refrigerant pipeline of the wet film type low temperature type air cooling heat pump multi-connected unit.
Preferably, the wet film type low temperature air-cooled heat pump multi-connected unit further comprises an economizer, a second expansion valve and a main electromagnetic valve, and the compressor is further provided with an EVI injection port;
the economizer is provided with a first connecting port and a second connecting port which are communicated with each other, and a third connecting port and a fourth connecting port which are communicated with each other;
the connection mode of the liquid storage device and the first expansion valve is as follows: the liquid reservoir is communicated with the first connecting port through the main electromagnetic valve and the second expansion valve; the second connection port is communicated with the EVI jet port; the third connecting port is communicated with the first expansion valve, and the outlet of the liquid reservoir is communicated with the fourth connecting port.
Preferably, the wet film type low temperature type air-cooled heat pump multi-connected unit further comprises a high temperature protection pipeline;
the high-temperature protection pipeline is provided with a thermal expansion valve and an additional electromagnetic valve;
the connecting pipeline between the liquid reservoir and the main electromagnetic valve is communicated with the EVI injection port through the additional electromagnetic valve and the thermal expansion valve.
Preferably, in the wet film type low temperature air-cooled heat pump multi-connected unit, the water-cooled heat exchanger is connected in series with the air-cooled heat exchanger.
Preferably, in the wet film type low temperature air-cooled heat pump multi-connected unit, the water-cooled heat exchanger is connected in parallel with the air-cooled heat exchanger.
Preferably, in the wet film low temperature type air-cooled heat pump multi-connected unit, the air-cooled heat exchanger is a fin-on-fin type heat exchanger, and the wet film heat exchanger is located in a groove formed by the fin-on-fin type heat exchanger.
Preferably, in the wet film type low temperature air-cooled heat pump multi-connected unit, the outdoor heat exchange unit further comprises an outdoor unit housing and a water baffle, and the air-cooled heat exchanger and the wet film heat exchanger are both positioned in the outdoor unit housing;
the outdoor unit housing is provided with a pore plate;
an air outlet is formed in the top wall of the outdoor unit housing, and the fan is arranged at the air outlet;
the water baffle is positioned between the air cooling heat exchanger and the wet film heat exchanger.
Preferably, in the above wet film type low temperature type air-cooled heat pump multi-connected unit, the outdoor unit housing is further provided with a guard board, the air-cooled heat exchanger is located at the outer side of the lower portion of the wet film heat exchanger, the guard board is arranged at the outer side of the upper portion of the wet film heat exchanger, the pore plate is correspondingly arranged with the air-cooled heat exchanger, and the guard board is connected with the pore plate;
the inner side of the guard plate is provided with a foaming filling layer.
Preferably, in the wet film type low temperature type air-cooled heat pump multi-connected unit, the cooling water tank comprises a water collecting tank with a flaring structure, a water collecting tank communicated with the bottom of the water collecting tank, a water supplementing pipeline communicated with the water collecting tank or the water collecting tank, and a water level detection device for detecting the water level in the water collecting tank, and a water inlet of the spray water pump is communicated with the water collecting tank.
Preferably, in the wet film type low temperature air-cooled heat pump multi-connected unit, the multi-connected unit further comprises a gas-liquid separator, wherein the second interface B of the four-way valve is communicated with the reflux port through the gas-liquid separator;
and/or, further comprising a dry filter disposed at an outlet end of the reservoir.
According to the wet film type low-temperature air-cooled heat pump multi-connected unit, the wet film heat exchanger is adopted to cool water, the cooled water exchanges heat with the refrigerant through the water-cooled heat exchanger, and the water-cooled heat exchanger is combined with the air-cooled heat exchanger to exchange heat with the refrigerant, so that the refrigeration efficiency is effectively improved; and moreover, the evaporative cooling heat exchanger is avoided, so that the problem that the evaporative cooling heat exchanger cannot heat in winter due to low heating efficiency is solved, the problem of serious scaling of the evaporative cooling heat exchanger is solved, and the heating efficiency in winter is improved. Thereby realizing high-efficiency refrigeration and heating operation.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of a first wet film type low temperature air-cooled heat pump multi-connected unit provided by the invention;
fig. 2 is a schematic overall flow chart of a specific embodiment of a refrigeration mode of the wet film type low temperature air-cooled heat pump multi-connected unit provided by the invention;
fig. 3 is a schematic overall flow chart of a heating mode embodiment of the wet film type low temperature air-cooled heat pump multi-connected unit provided by the invention;
fig. 4 is a schematic side view of an outdoor heat exchange unit according to the present invention;
fig. 5 is a schematic sectional view of an outdoor heat exchange unit according to the present invention;
FIG. 6 is a schematic view of the cross-sectional structure taken along the A-A plane in FIG. 5;
fig. 7 is a schematic view of another cross-sectional structure of the outdoor heat exchange unit provided by the present invention;
FIG. 8 is a schematic view of the cross-sectional structure along the B-B plane in FIG. 7;
FIG. 9 is a schematic view of the structure of FIG. 7 taken along the C-C plane;
fig. 10 is a schematic top view of an outdoor heat exchange unit according to the present invention;
FIG. 11 is a schematic diagram of the overall flow of a second wet film type low temperature air-cooled heat pump multi-unit provided by the invention;
fig. 12 is a schematic overall flow diagram of a third wet film type low temperature air-cooled heat pump multi-connected unit provided by the invention;
fig. 13 is a schematic overall flow diagram of a fourth wet film type low temperature air-cooled heat pump multi-connected unit provided by the invention;
FIG. 14 is a schematic diagram of a first connection structure of a water-cooled heat exchanger and an air-cooled heat exchanger according to the present invention;
FIG. 15 is a schematic diagram of a second connection structure of a water-cooled heat exchanger and an air-cooled heat exchanger according to the present invention;
fig. 16 is a schematic diagram of a third connection structure of a water-cooled heat exchanger and an air-cooled heat exchanger according to the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, the embodiment of the invention provides a wet film type low temperature air-cooled heat pump multi-connected unit, which comprises a compressor 1, an outdoor heat exchange unit, a four-way valve 2, an indoor heat exchange unit 3, a liquid storage device 5, a first expansion valve 7, a first electromagnetic valve 19, a second electromagnetic valve 20, a main check valve 16, a secondary check valve 15, a first check valve 17 and a second check valve 18;
the compressor 1 is provided with a return port and a discharge port; the first interface A of the four-way valve 2 is communicated with one end of the outdoor heat exchange unit, the second interface B of the four-way valve 2 is communicated with the reflux port, the third interface C of the four-way valve 2 is communicated with one end of the indoor heat exchange unit 3, and the fourth interface D of the four-way valve 2 is communicated with the outflow port; the main one-way valve 16 controls the other end of the outdoor heat exchange unit to be communicated with the liquid reservoir 5, and the auxiliary one-way valve 15 controls the other end of the indoor heat exchange unit 3 to be communicated with the liquid reservoir 5; the liquid reservoir 5 is connected with the first expansion valve 7, the first expansion valve 7 is communicated with the other end of the outdoor heat exchange unit through the first electromagnetic valve 19 and the first one-way valve 17, and the first expansion valve 7 is communicated with the other end of the indoor heat exchange unit 3 through the second electromagnetic valve 20 and the second one-way valve 18;
the indoor heat exchange unit 3 is a multi-connected indoor unit or a shell-and-tube heat exchanger; the outdoor heat exchange unit includes: the device comprises a water-cooling heat exchanger 4, an air-cooling heat exchanger 12 connected with the water-cooling heat exchanger 4, a fan 13 for enabling air to flow through the air-cooling heat exchanger 12, a wet film heat exchanger 11, a spraying device 10 for spraying cooling water to the wet film heat exchanger 11, a spraying water pump 9 connected with the spraying device 10, a cooling water tank positioned below the wet film heat exchanger 11 and used for supplying water to the spraying water pump 9, and a spraying pipeline for communicating the spraying device 10 with the spraying water pump 9;
the water-cooling heat exchange pipeline of the water-cooling heat exchanger 4 is connected to the spray pipeline, and the refrigerant heat exchange pipeline of the water-cooling heat exchanger 4 is connected to the refrigerant pipeline of the wet film type low temperature air-cooling heat pump multi-connected unit.
According to the wet film type low-temperature air-cooled heat pump multi-connected unit provided by the embodiment of the invention, the wet film heat exchanger 11 is adopted to cool water, the cooled water exchanges heat with the refrigerant through the water-cooled heat exchanger 4, and the water-cooled heat exchanger 4 is combined with the air-cooled heat exchanger 12 to exchange heat with the refrigerant, so that the refrigeration efficiency is effectively improved; and moreover, the evaporative cooling heat exchanger is avoided, so that the problem that the evaporative cooling heat exchanger cannot heat in winter due to low heating efficiency is solved, the problem of serious scaling of the evaporative cooling heat exchanger is solved, and the heating efficiency in winter is improved. Thereby realizing high-efficiency refrigeration and heating operation.
It can be understood that the four-way valve can be switched to realize the communication of the first interface A, the second interface B, the third interface C and the fourth interface D of the four-way valve.
As shown in fig. 1 to 3, in the above embodiment, the wet film type low temperature air-cooled heat pump multi-unit further includes an economizer 14a, a second expansion valve 8, and a main solenoid valve 21, and the compressor 1 further has an EVI injection port; the economizer 14a has a first connection port and a second connection port that communicate with each other, and a third connection port and a fourth connection port that communicate with each other; the connection mode of the liquid reservoir 5 and the first expansion valve 7 is as follows: the liquid reservoir 5 is communicated with the first connecting port through the main electromagnetic valve 21 and the second expansion valve 8; the second connecting port is communicated with the EVI jet port; the third connection port is communicated with the first expansion valve 7, and the outlet of the liquid reservoir 5 is communicated with the fourth connection port.
The compressor 1 can be a vapor injection enthalpy-increasing scroll compressor and can be a vapor injection enthalpy-increasing screw compressor; the compressor can be a non-vapor injection enthalpy-increasing scroll compressor and a non-vapor injection enthalpy-increasing screw compressor.
Preferably, the compressor 1 is a jet culvert compressor. Through the arrangement, the energy conservation and high efficiency of the compressor 1 in operation are ensured, the performance is stable at severe cold temperature, and the unit can be ensured to stably operate in cold weather in the south and the north.
In the present embodiment, the compressor 1 is preferably an EVI scroll compressor. As compressor 1, an EVI screw compressor may be used, and the above-described effect can be achieved as well. Of course, other types of compressors may be employed, and are not all described in detail herein and are within the scope of protection.
A general compressor, that is, without the EVI injection port, may also be employed, and therefore, the economizer 14a is not required as shown in fig. 11 and 13.
In this embodiment, the indoor heat exchange unit 3 is preferably a multiple indoor unit. The indoor heat exchange unit 3 may be a shell-and-tube heat exchanger, as shown in fig. 12 and 13, that is, the wet film type low temperature air-cooled heat pump multi-connected unit is an air-cooled heat pump unit.
As shown in fig. 2, in the cooling mode, the second solenoid valve 20 and the main solenoid valve 21 are opened, and the first solenoid valve 19 is closed. The blower 13 is started. In this state, the spray water pump 9 is turned on, and the wet film heat exchanger 11 cools the water in the cooling water tank. Wherein, the water-cooling heat exchanger 4 (refrigerant heat exchange pipeline) is connected in series with the air-cooling heat exchanger 12; the water-cooled heat exchanger 4 (water-cooled heat exchange line) is connected in series with the wet film heat exchanger 11.
The first port A of the four-way valve 2 is communicated with the fourth port D, and the second port B is communicated with the third port C. That is, the outflow port of the compressor 1 is communicated with one end of the water-cooled heat exchanger 4 after passing through the four-way valve 2, and the refrigerant flows into the air-cooled heat exchanger 12 for secondary cooling after passing through the water-cooled heat exchanger 4 for water cooling. Then through the reservoir 5 and the drier-filter 6 and into a main circuit and an auxiliary EVI circuit:
in the main circuit, the refrigerant passes through the liquid storage device 5 and the dry filter 6, then passes through the fourth connection port of the economizer 14a and the third connection port thereof, then is cooled and supercooled further, then passes through the first expansion valve 7 to be reduced into low-temperature low-pressure refrigerant liquid refrigerant, and enters the indoor heat exchange unit 3 through the second electromagnetic valve 20 and the second one-way valve 18, and the refrigerant is vaporized and evaporated into low-temperature low-pressure steam and then enters the return port of the compressor 1 through the four-way valve 2 to carry out the next cycle.
In the auxiliary EVI circuit, the refrigerant passes through the liquid reservoir 5 and the dry filter 6, then passes through the main electromagnetic valve 21 and the second expansion valve 8, then passes through the first connection port and the second connection port of the economizer 14a, and further is vaporized and evaporated to become medium-temperature medium-pressure steam, and then enters the compressor 1 through the EVI injection port of the compressor 1 to complete a cycle.
Wherein, the water-cooling heat exchange pipeline of the water-cooling heat exchanger 4 is connected in series on the spray pipeline. The cooling water at the water outlet of the spray water pump 9 flows along the spray pipeline, enters the water-cooling heat exchange pipeline of the water-cooling heat exchanger 4 and then exchanges heat with the refrigerant in the refrigerant heat exchange pipeline of the water-cooling heat exchanger 4, the temperature of the refrigerant is reduced, the cooling water absorbing heat is sprayed on the wet film filler in the wet film heat exchanger 11 through the spray device 10, and the cooling water permeates into the wet film filler to exchange heat with air flowing through the wet film filler. The wet film heat exchanger 11 effectively increases the contact area of the cooling water and the air, so that the cooling water is cooled down quickly and simultaneously has a filtering effect on the cooling water.
The cooling medium is cooled through the water-cooling heat exchanger 4 and the air-cooling heat exchanger 12 which are connected in series, so that the temperature of the cooling medium is effectively reduced, and the refrigerating effect of the multi-connected unit is further improved.
As shown in fig. 3, in the heating mode, the second solenoid valve 20 and the main solenoid valve 21 are opened, and the first solenoid valve 19 is closed. The blower 13 is started. In this state, the spray water pump 9 is turned off, the wet film heat exchanger 11 is in a closed state, and the air-cooled heat exchanger 12 is operated alone.
The first port A of the four-way valve 2 is communicated with the second port B, and the third port C is communicated with the fourth port D. That is, the outflow port of the compressor 1 is communicated with one end of the indoor heat exchange unit 3 after passing through the four-way valve 2, and the high-temperature and high-pressure vaporous refrigerant releases heat to the indoor space and is condensed and liquefied, so that the high-pressure normal-temperature liquid refrigerant is changed into the high-pressure normal-temperature liquid refrigerant to flow out of the indoor heat exchange unit 3, and indoor heating is realized. The high-pressure liquid refrigerant enters the liquid reservoir 5 and the dry filter 6 after passing through the auxiliary one-way valve 15, and is divided into a main loop and an auxiliary EVI loop:
in the main loop, the refrigerant is supercooled and cooled through a fourth connection port and a third connection port of an economizer 14a after passing through a liquid reservoir 5 and a dry filter 6, then is cooled and reduced into low-temperature low-pressure refrigerant liquid refrigerant through a first expansion valve 7, enters an air-cooled heat exchanger 12 through a first electromagnetic valve 19 and a first one-way valve 17, absorbs heat through the air-cooled heat exchanger 12, and then is vaporized and evaporated into low-temperature low-pressure steam, and then enters a return port of the compressor 1 through a four-way valve 2 for the next cycle. Wherein, before entering the four-way valve 2, the water-cooled heat exchanger 4 passes through the water-cooled heat exchanger 4, and the wet film heat exchanger 11 is in a closed state, so the water-cooled heat exchanger 4 is also in a closed state.
In the auxiliary EVI circuit, the refrigerant passes through the liquid reservoir 5 and the dry filter 6, then passes through the main electromagnetic valve 21 and the second expansion valve 8, then passes through the first connection port and the second connection port of the economizer 14a, and further is vaporized and evaporated to become medium-temperature medium-pressure steam, and then enters the compressor 1 through the EVI injection port of the compressor 1 to complete a cycle.
It can be understood that one end of the outdoor heat exchange unit and the other end of the outdoor heat exchange unit are both connected ends of the refrigerant heat exchange pipeline of the water-cooling heat exchanger 4 and/or the air-cooling heat exchanger 12. That is, the refrigerant passes through the water-cooled heat exchanger 4 and the air-cooled heat exchanger 12, and does not flow into the wet film heat exchanger 11.
In this embodiment, the wet film type low temperature type air-cooled heat pump multi-connected unit further includes a high temperature protection pipeline, and the high temperature protection pipeline is provided with a thermal expansion valve 23 (i.e. capillary tube 13) and an additional electromagnetic valve 22. The compressor 1 also has an EVI injection port; the economizer 14a has a first connection port and a second connection port that communicate with each other, and a third connection port and a fourth connection port that communicate with each other; the connection mode of the liquid reservoir 5 and the first expansion valve 7 is as follows: the liquid reservoir 5 and the dry filter 6 are communicated with a fourth connecting port of the economizer 14a, and the liquid reservoir 5 is communicated with a first connecting port of the economizer 14a through the main electromagnetic valve 21 and the second expansion valve 8; the second connection port of the economizer 14a communicates with the EVI injection port; the third connection port communicates with the first expansion valve 7.
When the unit is in a refrigerating mode (shown in fig. 2) or a heating mode (shown in fig. 3), the exhaust temperature of the compressor 1 is higher than a set value t3 (such as 105 ℃) of a set normal exhaust temperature t0 (100 ℃), the first electromagnetic valve 19 is not opened, the main electromagnetic valve 21 is closed, the additional electromagnetic valve 22 is opened, and then the vapor-liquid reflux amount of the refrigerant is increased through the action of the thermal expansion valve 23, so that the exhaust temperature and pressure of the compressor 1 are reduced. When the exhaust temperature of the compressor 1 is lower than the set temperature t1 (for example, less than or equal to 90 ℃), the main electromagnetic valve 21 is opened, and the additional electromagnetic valve 22 is closed. The discharge temperature t0 of the compressor 1 is a safe operating temperature; t1 (e.g., 90 ℃) is a first lower limit; t2 (e.g., 85 ℃) is a second temperature lower limit; t3 (e.g., 105 ℃ C.) is the upper temperature limit. Wherein t2 is not less than t1 and not more than t0 is not less than t3, and all the values can be adjusted according to the needs.
Preferably, the unit also comprises a needle valve, a high-pressure gauge, a high-pressure protection switch, an exhaust temperature sensing probe and other components arranged at the outlet of the compressor 1; the back flow port of the compressor is provided with a needle valve, a low-pressure gauge, a low-pressure protection switch, an air cooling fin temperature sensing probe, an environment temperature sensing probe and other components, but the invention is not limited to the above.
The high-temperature protection pipeline H is not additionally arranged.
In this embodiment, the water-cooling heat exchanger 4 is connected in series with the air-cooling heat exchanger 12, so that the refrigerant heat exchange pipeline of the water-cooling heat exchanger 4 is connected in series with the refrigerant pipeline of the wet film type low temperature air-cooling heat pump multi-unit. That is, the first port a of the four-way valve 2 is connected in series with the air-cooled heat exchanger 12 through the refrigerant heat exchange pipeline of the water-cooled heat exchanger 4. Through the arrangement, the refrigerant flowing out of the compressor 1 sequentially passes through the water-cooling heat exchanger 4 and the air-cooling heat exchanger 12. Of course, it is also possible to pass through the air-cooled heat exchanger 12 and then the water-cooled heat exchanger 4.
As shown in fig. 15, in the first embodiment, the air-cooled heat exchanger 12 is disposed in series with the water-cooled heat exchanger 4, one end of the air-cooled heat exchanger 12 has an air-cooled electromagnetic valve 38b, one end of the water-cooled heat exchanger 4 is connected to one side of the air-cooled electromagnetic valve 38b through a water-cooled electromagnetic valve 39b, and the other end of the water-cooled heat exchanger 4 is connected to the other side of the air-cooled electromagnetic valve 38 b. By the above arrangement, the switching between the air-cooled heat exchanger 12 and the water-cooled heat exchanger 4 can be realized as well.
In the second embodiment, as shown in fig. 16, the air-cooled heat exchanger 12 is arranged in series with the water-cooled heat exchanger 4, one end of the air-cooled heat exchanger 12 is provided with an air-cooled electromagnetic valve 38c, one end of the water-cooled heat exchanger 4 is connected to one side of the air-cooled electromagnetic valve 38c through a water-cooled electromagnetic valve 39c, and the other end of the air-cooled heat exchanger 12 is connected to the other side of the water-cooled electromagnetic valve 39 c. By the above arrangement, the switching between the air-cooled heat exchanger 12 and the water-cooled heat exchanger 4 can be realized as well.
In another embodiment, the water-cooled heat exchanger 4 is connected in parallel with the air-cooled heat exchanger 12. The refrigerant flowing out of the compressor 1 can be split and then respectively pass through the water-cooling heat exchanger 4 and the air-cooling heat exchanger 12, and the refrigerant can be subjected to heat exchange through the two heat exchangers.
In the third embodiment, as shown in fig. 14, the air-cooled heat exchanger 12 and the water-cooled heat exchanger 4 are connected in parallel, and an air-cooled electromagnetic valve 38ba is provided on the branch where the air-cooled heat exchanger 12 is located, and a water-cooled electromagnetic valve 39a is provided on the branch where the water-cooled heat exchanger 4 is located. The switching between the air-cooled heat exchanger 12 and the water-cooled heat exchanger 4 is achieved by switching between the air-cooled electromagnetic valve 38ba and the water-cooled electromagnetic valve 39a.
In order to improve the structural compactness and ensure the heat exchange effect, the air-cooled heat exchanger 12 is positioned outside the wet film heat exchanger 11.
As shown in fig. 6, in the present embodiment, the air-cooled heat exchanger 42 is a fin-type heat exchanger, and the wet film heat exchanger 11 is located in a groove formed in the fin-type heat exchanger.
As shown in fig. 4 to 10, further, the outdoor heat exchange unit further comprises an outdoor unit housing and a water baffle 11-1, and the air-cooled heat exchanger 12 and the wet film heat exchanger 11 are both positioned in the outdoor unit housing; the outdoor unit housing is provided with a pore plate 98; an air outlet is formed in the top wall 92-1 of the outdoor unit housing, and the fan 13 is arranged at the air outlet; the water baffle 11-1 is located between the air-cooled heat exchanger 12 and the wet film heat exchanger 11. Through the arrangement, the independent operation of the air-cooled heat exchanger 12 and the wet film heat exchanger 11 is effectively ensured, the direct contact between the air-cooled heat exchanger 12 and cooling water is avoided, and the structural compactness of the outdoor heat exchange unit is also effectively improved.
The bottom of the outdoor unit casing is a base structure 95, and other components can be arranged at other component mounting positions 96, and the distribution box 97 is also positioned at other component mounting positions 96 and isolated from the cooling water tank.
Further, the outdoor unit housing is also provided with a guard plate 92, the air-cooled heat exchanger 12 is positioned at the outer side of the lower part of the wet film heat exchanger 11, the guard plate 92 is arranged at the outer side of the upper part of the wet film heat exchanger 11, the pore plate 98 is correspondingly arranged with the air-cooled heat exchanger 12, and the guard plate 92 is connected with the pore plate 98; the inner side of the guard 92 has a foam filling layer 50. By providing the foam filling layer 50, filling isolation is further achieved. And also allows the outside air to exchange heat with the air-cooled heat exchanger 12 through the orifice plate 98.
In this embodiment, the cooling water tank includes a water collecting tank of a flaring structure, a water collecting tank 94 communicated with the bottom of the water collecting tank, a water replenishing pipe 93 communicated with the water collecting tank 94 or the water collecting tank, and a water level detecting device for detecting the water level in the water collecting tank 94, and a water inlet of the shower water pump 9 is communicated with the water collecting tank 94. Through the above arrangement, the water source is conveniently supplemented, and the sufficiency of the cooling water is ensured, so that the stable operation of the wet film heat exchanger 11 is ensured.
Further, the wet film type low temperature type air-cooled heat pump multi-unit in the embodiment further comprises a gas-liquid separator 14, and the second interface B of the four-way valve 2 is communicated with the reflux port through the gas-liquid separator 14. By providing the gas-liquid separator 14, stable operation of the compressor 1 is ensured.
Still further, a drier-filter 6 is included, and the reservoir 5 communicates with a fourth connection port of the economizer 14a and the main solenoid valve 21 through the drier-filter 6. The service life of the compressor 1 is effectively prolonged through the filtering effect of the filter drier 6 on the refrigerant.
Preferably, the indoor heat exchange unit 3 of the wet film type low temperature type air-cooled heat pump multi-connected unit is a multi-connected indoor unit, so that the refrigerating efficiency of the multi-connected air-cooled heat pump is effectively improved.
Also, it is understood that the wet film heat exchanger 11 includes a housing and a wet film 11-2 filled in the housing. The wet film 11-2 is generally a polymer composite filler (fiber, resin or PVC material, etc.), is not easy to scale, has low replacement cost and has a filtering function. In this embodiment, the wet film 11-2 is a honeycomb structure.
The wet film type low temperature type air-cooled heat pump multi-connected unit provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The wet film type low-temperature air-cooled heat pump multi-connected unit is characterized by comprising a compressor (1), an outdoor heat exchange unit, a four-way valve (2), an indoor heat exchange unit (3), a liquid reservoir (5), a first expansion valve (7), a first electromagnetic valve (19), a second electromagnetic valve (20), a main unidirectional valve (16), a secondary unidirectional valve (15), a first unidirectional valve (17) and a second unidirectional valve (18);
the compressor (1) is provided with a return flow port and a discharge port; the first port A of the four-way valve (2) is communicated with one end of the outdoor heat exchange unit, the second port B of the four-way valve (2) is communicated with the reflux port, the third port C of the four-way valve (2) is communicated with one end of the indoor heat exchange unit (3), and the fourth port D of the four-way valve (2) is communicated with the outflow port; the main one-way valve (16) controls the other end of the outdoor heat exchange unit to be communicated with the liquid reservoir (5), and the auxiliary one-way valve (15) controls the other end of the indoor heat exchange unit (3) to be communicated with the liquid reservoir (5); the liquid storage device (5) is connected with the first expansion valve (7), the first expansion valve (7) is communicated with the other end of the outdoor heat exchange unit through the first electromagnetic valve (19) and the first one-way valve (17), and the first expansion valve (7) is communicated with the other end of the indoor heat exchange unit (3) through the second electromagnetic valve (20) and the second one-way valve (18);
the indoor heat exchange unit (3) is a multi-connected indoor unit or a shell-and-tube heat exchanger; the outdoor heat exchange unit includes: the device comprises a water-cooling heat exchanger (4), an air-cooling heat exchanger (12) connected with the water-cooling heat exchanger (4), a fan (13) for enabling air to flow through the air-cooling heat exchanger (12), a wet film heat exchanger (11), a spraying device (10) for spraying cooling water to the wet film heat exchanger (11), a spraying water pump (9) connected with the spraying device (10), a cooling water tank positioned below the wet film heat exchanger (11) and used for supplying water to the spraying water pump (9) and a spraying pipeline for communicating the spraying device (10) with the spraying water pump (9);
the water cooling heat exchange pipeline of the water cooling heat exchanger (4) is connected to the spray pipeline, and the refrigerant heat exchange pipeline of the water cooling heat exchanger (4) is connected to the refrigerant pipeline of the wet film type low temperature air cooling heat pump multi-connected unit.
2. The wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 1, further comprising an economizer (14 a), a second expansion valve (8) and a main electromagnetic valve (21), wherein the compressor (1) is further provided with an EVI injection port;
the economizer (14 a) is provided with a first connecting port and a second connecting port which are communicated with each other, and a third connecting port and a fourth connecting port which are communicated with each other;
the liquid storage device (5) and the first expansion valve (7) are connected in the following manner: the liquid reservoir (5) is communicated with the first connecting port through the main electromagnetic valve (21) and the second expansion valve (8); the second connection port is communicated with the EVI jet port; the third connecting port is communicated with the first expansion valve (7), and the outlet of the liquid reservoir (5) is communicated with the fourth connecting port.
3. The wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 2, further comprising a high temperature protection pipeline;
the high-temperature protection pipeline is provided with a thermal expansion valve (23) and an additional electromagnetic valve (22);
the connecting pipeline between the liquid reservoir (5) and the main electromagnetic valve (21) is communicated with the EVI injection port through the additional electromagnetic valve (22) and the thermal expansion valve (23).
4. Wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 1, wherein the water-cooled heat exchanger (4) is connected in series with the air-cooled heat exchanger (12).
5. Wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 1, wherein the water-cooled heat exchanger (4) is connected in parallel with the air-cooled heat exchanger (12).
6. Wet film low temperature type air-cooled heat pump multi-unit according to claim 1, wherein the air-cooled heat exchanger (12) is a fin-type heat exchanger, and the wet film heat exchanger (11) is located in a groove formed by the fin-type heat exchanger.
7. The wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 6, wherein the outdoor heat exchange unit further comprises an outdoor unit housing and a water baffle (11-1), and the air-cooled heat exchanger (12) and the wet film heat exchanger (11) are both positioned in the outdoor unit housing;
the outdoor unit housing is provided with a pore plate (98);
an air outlet is formed in the top wall (92-1) of the outdoor unit housing, and the fan (13) is arranged at the air outlet;
the water baffle (11-1) is positioned between the air cooling heat exchanger (12) and the wet film heat exchanger (11).
8. The wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 7, wherein the outdoor unit housing is further provided with a guard plate (92), the air-cooled heat exchanger (12) is located at the outer side of the lower portion of the wet film heat exchanger (11), the guard plate (92) is arranged at the outer side of the upper portion of the wet film heat exchanger (11), the orifice plate (98) is arranged corresponding to the air-cooled heat exchanger (12), and the guard plate (92) is connected with the orifice plate (98);
the inner side of the guard plate (92) is provided with a foaming filling layer (50).
9. Wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 1, wherein the cooling water tank comprises a water collecting tank with a flaring structure, a water collecting tank (94) communicated with the bottom of the water collecting tank, a water supplementing pipeline (93) communicated with the water collecting tank (94) or the water collecting tank, and a water level detection device for detecting the water level in the water collecting tank (94), and the water inlet of the spray water pump (9) is communicated with the water collecting tank (94).
10. The wet film type low temperature type air-cooled heat pump multi-connected unit according to claim 1, further comprising a gas-liquid separator (14), wherein a second interface B of the four-way valve (2) is communicated with the reflux port through the gas-liquid separator (14);
and/or, still include dry filter (6), dry filter (6) set up in the exit end of reservoir (5).
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