CN113137773A - Double-power heat pump refrigerating unit - Google Patents
Double-power heat pump refrigerating unit Download PDFInfo
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- CN113137773A CN113137773A CN202110241554.0A CN202110241554A CN113137773A CN 113137773 A CN113137773 A CN 113137773A CN 202110241554 A CN202110241554 A CN 202110241554A CN 113137773 A CN113137773 A CN 113137773A
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- 239000003507 refrigerant Substances 0.000 claims abstract description 184
- 238000005057 refrigeration Methods 0.000 claims abstract description 53
- 230000006698 induction Effects 0.000 claims abstract 2
- 238000001816 cooling Methods 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000005339 levitation Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 46
- 238000001704 evaporation Methods 0.000 description 14
- 230000008020 evaporation Effects 0.000 description 14
- 239000000725 suspension Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 241000233866 Fungi Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B39/04—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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to the technical field of refrigeration, and particularly provides a double-power heat pump refrigerating unit, aiming at solving the technical problem of insufficient circulating power in the unit in the prior art. The gas vent of the compressor of this unit and the refrigerant entry intercommunication of condenser, the induction port of compressor and the refrigerant export of evaporimeter are through first main switch valve intercommunication, and the refrigerant entry of condenser and the refrigerant export of evaporimeter are through second main switch valve intercommunication, and it still includes: the refrigerant pump and the first pump switch valve are connected in series in one branch of the first parallel refrigerant flow path, and the first press switch valve is arranged in the other branch of the first parallel refrigerant flow path; one branch of the second parallel refrigerant flow path is connected with the main throttling element and a second press switch valve in series, and the other branch of the second parallel refrigerant flow path is provided with a second pump switch valve; and the two are connected in series between the refrigerant outlet of the condenser and the refrigerant inlet of the evaporator in sequence along the refrigerant flow direction. Therefore, under the refrigeration mode of the refrigerant pump, the refrigerant directly enters the evaporator without throttling and pressure reduction, and sufficient circulating power in the unit is ensured.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly provides a double-power heat pump refrigerating unit.
Background
The double-power heat pump refrigerating unit can refrigerate all the year round, is particularly suitable for the edible fungus cultivation industry, and can create a temperature environment more favorable for fungus growth.
Chinese utility model patent with publication number CN211695483U discloses a natural cooling annual refrigeration type evaporative cooling directly-expanding magnetic suspension refrigerating unit, actually discloses a double dynamical heat pump refrigerating unit, and it can be known by referring to paragraph [ 0022 ] and [ 0023 ] and attached figure 1 of its specification, and the natural cooling annual refrigeration type evaporative cooling directly-expanding magnetic suspension refrigerating unit includes compressor refrigeration mode and refrigerant pump refrigeration mode, and the refrigeration principle of these two kinds of working modes is respectively:
a compressor refrigeration mode: when natural cooling is not started, gas exhausted from an exhaust port of the magnetic suspension compressor 1 is delivered into a condensing coil 21 in the evaporative cooling type condenser 3 through the check valve 2, flows into the liquid storage tank 5 through the electromagnetic valve five 4 after the process of condensation heat release in the condensing coil 21, and medium-temperature and high-pressure refrigerants in the liquid storage tank 5 enter the drying filter 7 through the electromagnetic valve four 6 and are divided into two paths: one path is a main path, and the medium-temperature and high-pressure refrigerant enters the direct evaporation coil 11 to complete the evaporation and heat absorption process after being throttled and depressurized by the electromagnetic valve I9 and the electronic expansion valve 10; the direct evaporation coils 11 are connected in parallel and directly arranged in the air-conditioning room, and the air treated by the direct evaporation coils 11 is sent into the air-conditioning room by a fan arranged at the top of the direct evaporation coils; the evaporated low-temperature low-pressure refrigerant steam passes through the solenoid valve six 12 to the vapor-liquid separator 13, the refrigerant steam passes through the butterfly valve 14 to the magnetic suspension compressor 1 to complete the air suction compression process, and the whole refrigeration process is completed in a circulating reciprocating mode.
Refrigerant pump refrigeration mode: the refrigerant pump 26, the electromagnetic valve III 27 and the electromagnetic valve II 28 are started, the magnetic suspension compressor 1 and the spray cooling water pump 24 are closed, the axial flow fan 19 at the top of the evaporative cooling type condenser 3 performs variable air volume operation, the refrigerant discharged from the direct evaporation coil 11 directly enters the evaporative cooling type condenser 3 for condensation, after the process of condensation and heat release in the condensation coil 21, the refrigerant in the liquid storage tank 5 flows into the liquid storage tank 5 through the electromagnetic valve five 4, enters the drying filter 7 through the electromagnetic valve four 6, enters the refrigerant pump 26 for pressurization through the drying filter 7 and then is sent to the electronic expansion valve 10 for throttling and pressure reduction, the refrigerant after throttling and pressure reduction enters the direct evaporation coil 11 to complete the process of evaporation and heat absorption, the direct evaporation coils 11 are connected in parallel and directly arranged in an air-conditioning room, and the air treated by the direct evaporation coil 11 is sent into the air-conditioning room through the fan arranged at the top of the direct evaporation coil 11.
In the refrigeration unit, under the refrigeration mode of the refrigerant pump, the refrigerant pump provides power for driving the refrigerant to circularly flow in the unit, and the throttling depressurization of the electronic expansion valve on the upstream side of the evaporator can offset part of circulating power of the refrigerant pump, so that the problems of insufficient circulating power in the unit and poor refrigeration effect of the unit are caused.
In view of this, how to solve the problem in the prior art that insufficient power of the internal circulation of the unit is caused by the cancellation of the power of the refrigerant pump by the electronic expansion valve is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a double-power heat pump refrigerating unit, aiming at solving the technical problem of insufficient circulating power in the unit caused by the offset of an electronic expansion valve to the partial power of a refrigerant pump in the prior art.
The invention relates to a double-power heat pump refrigerating unit, wherein the exhaust port of a compressor of the double-power heat pump refrigerating unit is communicated with the refrigerant inlet of a condenser, the air suction port of the compressor is communicated with the refrigerant outlet of an evaporator through a first main switch valve, the refrigerant inlet of the condenser is communicated with the refrigerant outlet of the evaporator through a second main switch valve, and the double-power heat pump refrigerating unit also comprises: one branch of the first parallel refrigerant flow path is connected with a refrigerant pump and a first pump switch valve in series, and the other branch is provided with a first press switch valve; one branch of the second parallel refrigerant flow path is connected with a main throttling element and a second press switch valve in series, and the other branch is provided with a second pump switch valve; the first parallel refrigerant flow path and the second parallel refrigerant flow path are sequentially connected in series between a refrigerant outlet of the condenser and a refrigerant inlet of the evaporator along a refrigerant flow direction, and the refrigerant pump is used for providing circulating power for driving the refrigerant to flow from the condenser to the evaporator.
In a preferable embodiment of the above dual-power heat pump refrigerating unit of the present invention, the condenser includes: the tower body is provided with an air inlet and an air outlet; a fin heat exchanger disposed in the tower body and provided with the refrigerant inlet and the refrigerant outlet of the condenser; the spraying mechanism is arranged in the tower body and is positioned above the fin heat exchanger; the water pump is communicated with the spraying mechanism and is used for providing spraying liquid for the spraying mechanism; and the condensation fan is arranged at the air supply port.
In a preferable scheme of the above dual-power heat pump refrigerating unit, the fin heat exchanger is a V-shaped fin heat exchanger.
In a preferable embodiment of the above dual-power heat pump refrigerating unit of the present invention, the air inlet includes a first air inlet and a second air inlet, the first air inlet is disposed on the left side wall of the tower body and located below the fin heat exchanger, the second air inlet is disposed at the top of the tower body and located right above the fin heat exchanger, and the air supply outlet is disposed at the top of the tower body and located on the right side of the fin heat exchanger.
In a preferable embodiment of the above dual-power heat pump refrigerating unit of the present invention, a first main check valve is further connected in series between the exhaust port of the compressor and the refrigerant inlet of the condenser, and the first main check valve is configured to allow the refrigerant to flow from the compressor to the condenser.
In a preferable embodiment of the above dual-power heat pump refrigeration unit, the dual-power heat pump refrigeration unit further includes an unloading bypass, the unloading bypass includes a bypass switch valve and a bypass throttling element, the bypass switch valve and the bypass throttling element are arranged in parallel, the unloading bypass is communicated with the exhaust port and the suction port of the compressor, and a communication end between the unloading bypass and the exhaust port is located on an upstream side of the first main check valve.
In a preferable embodiment of the above dual-power heat pump refrigerating unit of the present invention, the dual-power heat pump refrigerating unit further includes a load balancing valve, the load balancing valve communicates with the air outlet and the air inlet of the compressor, and a communication end of the load balancing valve and the air outlet is located on a downstream side of the first main check valve.
In a preferable embodiment of the above dual-power heat pump refrigerating unit, the dual-power heat pump refrigerating unit further includes a cooling switch valve and a cooling throttling element, one port of the cooling switch valve is communicated with a refrigerant outlet of the condenser, and the other port of the cooling switch valve is communicated with the air suction port of the compressor through the cooling throttling element and is also directly communicated with the cooling port of the compressor.
In a preferable embodiment of the above dual-power heat pump refrigerating unit of the present invention, the dual-power heat pump refrigerating unit includes a plurality of evaporators, the plurality of evaporators are arranged in parallel, and a branch where each of the evaporators is located is connected in series with the second parallel refrigerant flow path.
In a preferable scheme of the above dual-power heat pump refrigerating unit, the compressor is an oil-free magnetic suspension compressor.
The invention relates to a double-power heat pump refrigerating unit, wherein the exhaust port of a compressor of the double-power heat pump refrigerating unit is communicated with the refrigerant inlet of a condenser, the air suction port of the compressor is communicated with the refrigerant outlet of an evaporator through a first main switch valve, the refrigerant inlet of the condenser is communicated with the refrigerant outlet of the evaporator through a second main switch valve, and the double-power heat pump refrigerating unit also comprises: one branch of the first parallel refrigerant flow path is connected with a refrigerant pump and a first pump switch valve in series, and the other branch is provided with a first press switch valve; one branch of the second parallel refrigerant flow path is connected with a main throttling element and a second press switch valve in series, and the other branch is provided with a second pump switch valve; the first parallel refrigerant flow path and the second parallel refrigerant flow path are sequentially connected in series between a refrigerant outlet of the condenser and a refrigerant inlet of the evaporator along a refrigerant flow direction, and the refrigerant pump is used for providing circulating power for driving the refrigerant to flow from the condenser to the evaporator.
The double-power heat pump refrigerating unit comprises a compressor refrigerating mode and a refrigerant pump refrigerating mode, and the refrigerating principles are as follows:
a compressor refrigeration mode: starting the compressor, opening the first main switch valve, the first compressor switch valve and the second compressor switch valve, closing the refrigerant pump, the first pump switch valve and the second pump switch valve, enabling high-temperature and high-pressure gaseous refrigerant in the compressor to enter the condenser through the first main check valve, performing heat exchange with the environment where the condenser is located to release heat and cool, then enabling the gaseous refrigerant to flow into the main throttling element through the first compressor switch valve and the second compressor switch valve, throttling and depressurizing through the main throttling element, enabling the gaseous refrigerant to enter the evaporator, performing heat exchange with the environment where the evaporator is located to absorb heat, and then enabling the gaseous refrigerant to flow through the first main switch valve and return into the compressor from the air suction port, so that the circulation refrigeration is performed.
Refrigerant pump refrigeration mode: and closing the compressor, the first main switch valve, the first press switch valve and the second press switch valve, starting the refrigerant pump, and opening the second main switch valve, the first pump switch valve and the second pump switch valve. Under the action of the refrigerant pump, the refrigerant in the condenser directly flows into the evaporator through the first pump switch valve and the second pump switch valve, exchanges heat with the ambient air where the evaporator is located to absorb heat, then returns into the condenser through the second main switch valve, and the circulation refrigeration is carried out in such a way
Therefore, the dual-power heat pump refrigerating unit of the embodiment ensures the throttling and pressure reducing requirements before the refrigerant enters the evaporator in the compressor refrigeration mode by additionally arranging the first parallel refrigerant flow path and the second parallel refrigerant flow path, and meanwhile, the refrigerant directly enters the evaporator without throttling and pressure reducing in the refrigerant pump refrigeration mode, so that the problem of insufficient circulating power in the unit due to the fact that the throttling element offsets partial power of the refrigerant pump in the prior art is solved, sufficient circulating power for driving the refrigerant to flow in the unit is ensured, and the refrigerating effect of the unit is improved.
Drawings
FIG. 1 is a schematic view of a refrigerant flow direction structure of a dual-power heat pump refrigerating unit according to an embodiment of the present invention in a compressor refrigeration mode;
FIG. 2 is an enlarged schematic view of an evaporator of the dual power heat pump refrigeration unit of FIG. 1;
FIG. 3 is an enlarged schematic view of a second parallel refrigerant flow path of the dual-power heat pump refrigeration unit of FIG. 1;
fig. 4 is a schematic view of the refrigerant flow direction structure of the dual-power heat pump refrigeration unit according to the embodiment of the invention in the refrigerant pump refrigeration mode.
In fig. 1 to 4, the one-to-one correspondence between the names and reference numerals of the respective components is as follows:
1, a compressor, 10 a first main switch valve, 11 a second main switch valve, 12 a first main check valve, 13 a second main check valve, 14 a load balance valve, 15 a cooling switch valve, 16 a cooling throttling element, 17 a liquid storage device and 18 a gas-liquid separator;
2, condenser: 20 tower body, 20i1A first air inlet 20i2 Second air inlet 20oThe air supply outlet, the fin heat exchanger 21, the spraying mechanism 22, the water pump 23 and the condensing fan 24;
3, evaporator: 30 air-cooled heat exchangers and 31 evaporation fans;
4 first parallel refrigerant flow path: 40 refrigerant pumps, 41 first pump switch valves, 42 first press switch valves and 43 first pump one-way valves;
5 second parallel refrigerant flow path: 50 a main throttling element, 51 a second press switching valve, 52 a second pump switching valve and 53 a second pump one-way valve;
6, unloading and bypassing: the switching valve is bypassed by 60, and the throttling element is bypassed by 61.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to better understand the dual-power heat pump refrigerating unit of the present invention, the specific structure and the working principle of the dual-power heat pump refrigerating unit are described in detail with reference to fig. 1 to 4, wherein fig. 1 is a schematic diagram of a refrigerant flow direction structure of a specific embodiment of the dual-power heat pump refrigerating unit of the present invention in a compressor refrigerating mode, fig. 2 is an enlarged structural diagram of an evaporator of the dual-power heat pump refrigerating unit of fig. 1, fig. 3 is an enlarged structural diagram of a second parallel refrigerant flow path of the dual-power heat pump refrigerating unit of fig. 1, and fig. 4 is a schematic diagram of a refrigerant flow direction structure of the specific embodiment of the dual-power heat pump refrigerating unit of the present invention in a refrigerant pump refrigerating mode.
It should be noted that the dotted arrows in FIGS. 1 and 2 "
"represents the air flow direction, and solid arrows" → "represent the refrigerant flow direction. In addition, the terms "upstream side" and "downstream side" used herein to describe the refrigerant flow direction are set based on the chronological order of the refrigerant flow, and in the same refrigeration cycle, the refrigerant flow position is the upstream side and the refrigerant flow position is the downstream side.
Referring to fig. 1, the dual-power heat pump refrigerating unit includes a compressor 1, a condenser 2 and an evaporator 3, wherein an exhaust port of the compressor 1 is communicated with a refrigerant inlet of the condenser 2, an air suction port of the compressor 1 is communicated with a refrigerant outlet of the evaporator 3 through a first main switching valve 10, and the refrigerant inlet of the condenser 2 is communicated with the refrigerant outlet of the evaporator 3 through a second main switching valve 11.
The compressor 1 compresses a low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant. In the present embodiment, an oil-free magnetic levitation compressor is preferably used, and the oil-free magnetic levitation compressor includes an exhaust port, an intake port, and a cooling port.
Compared with traditional compressors such as a screw compressor and the like, the oil-free magnetic suspension compressor does not need lubricating oil for lubrication and has the advantages of high refrigeration performance, good operation stability and the like. Of course, under the condition of meeting the basic functions of the dual-power heat pump refrigerating unit, the compressor 1 can also be a traditional compressor.
In the present embodiment, it is preferable to use the evaporative cold condenser 2, and the evaporative cold condenser 2 includes at least a tower body 20, a fin heat exchanger 21, a spray mechanism 22, a water pump 23, a condensing fan 24, and a water pipe.
Wherein, the tower body 20 is provided with a first air inlet 20i1A second air inlet 20i2And an air supply outlet 20oA condensing fan 24 is installed at the air supply port 20oAfter the blower is started, air outside the tower body 20 flows from the first air inlet 20i1And a second air inlet 20i2Into the tower 20 and finally from the supply air outlet 20oAnd is discharged to the outside of the tower body 20.
The fin heat exchanger 21 is fixedly or detachably installed in the tower body 20 and provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet of the fin heat exchanger 21 directly penetrate through the tower body 20 and extend out of the tower body 20, or penetrate through the tower body 20 through a pipeline and extend out of the tower body 20 so as to be communicated with an external pipeline.
Specifically, the refrigerant inlet of the fin heat exchanger 21 communicates with the discharge port of the compressor 1 through a gas pipe.
In more detail, a first main check valve 12 is connected in series to a gas pipe connecting a refrigerant inlet of the finned heat exchanger 21 and a gas outlet of the compressor 1, and the first main check valve 12 is used for allowing the refrigerant to flow from the compressor 1 to the finned heat exchanger 21 so as to prevent the refrigerant from flowing back from the finned heat exchanger 21 to the compressor 1.
Compared with the prior evaporative condenser 2 adopting a coil type heat exchanger, the fin type heat exchanger 21 has large heat exchange area and better heat exchange effect.
In addition, V-shaped is adopted in the embodimentA finned heat exchanger 21, a first air inlet 20 of the tower body 20i1A second air inlet 20 arranged on the left side wall of the tower body 20 and positioned below the V-shaped fin heat exchanger 21i2An air supply outlet 20 is arranged at the top of the tower body 20 and is positioned right above the V-shaped finned heat exchanger 21oWhich opens at the top of the tower body 20 and is located to the right of the V-shaped finned heat exchanger 21, the terms of orientation "upper, lower, top and right" as used herein are set with reference to the perspective of the reader viewing fig. 1.
So arranged, under the action of the condensing fan 24, air outside the tower body 20 passes through the first air inlet 20i1And a second air inlet 20i2Enters the tower body 20, fully exchanges heat with the fin heat exchanger 21 and then passes through the air supply outlet 20oAnd the air is discharged outside the tower body 20, and the shape characteristics of the V-shaped fin heat exchanger 21 are utilized, so that the air and the fin heat exchanger 21 can exchange heat most fully.
In this embodiment, the evaporator 3 preferably adopts an air-cooled evaporator 3, the air-cooled evaporator 3 at least includes an air-cooled heat exchanger 30 and an evaporation fan 31, and the evaporation fan 31 is used for dissipating heat from the surface of the heat exchanger. Of course, the heat exchanger of the evaporator 3 is not limited to the air-cooled heat exchanger 30 of the present embodiment, and may be an evaporative cooling heat exchanger or the like.
More preferably, the dual-power heat pump refrigerating unit of the embodiment includes a plurality of evaporators 3, the plurality of evaporators 3 are arranged in parallel, a refrigerant outlet of the air-cooled heat exchanger 30 of each evaporator 3 is communicated with a main refrigerant pipeline, the main refrigerant pipeline collects the refrigerant from the air-cooled heat exchanger 30 of each evaporator 3 through a flow dividing pipe and then divides the refrigerant into two paths, wherein one path is communicated with the suction port of the compressor 1 through the first main switch valve 10 and the gas-liquid separator 18 in sequence, and the other path is communicated with the refrigerant inlet of the condenser 2 through the second main switch valve 11 and the second main check valve 13 in sequence.
In the present embodiment, the gas-liquid separator 18 is disposed in the flow path where the first main on-off valve 10 is located, so as to perform a gas-liquid separation process on the refrigerant, so as to prevent the liquid refrigerant from entering the compressor 1 to generate a liquid impact phenomenon, thereby preventing internal functional elements of the compressor 1 from being damaged. Of course, the gas-liquid separator 18 need not be provided in the flow path, that is, the refrigerant inlet of the evaporator 3 may communicate with the suction port of the compressor 1 only through the first main on-off valve 10 and the related piping.
A second main check valve 13 is provided in the flow path of the second main on/off valve 11, and the second main check valve 13 allows the refrigerant to flow from the evaporator 3 to the condenser 2, and prevents the refrigerant discharged from the discharge port of the compressor 1 from flowing into the evaporator 3 in the cooling mode of the compressor 1.
Also, the dual-power heat pump refrigeration unit of the present embodiment includes a plurality of evaporators 3, that is, the unit is preferably a one-drive-many dual-power heat pump refrigeration unit. Of course, by increasing or decreasing the number of the evaporators 3 and the condensers 2, the unit may be a multi-split dual-power heat pump refrigeration unit or a one-split dual-power heat pump refrigeration unit, and those skilled in the art may adjust the unit according to actual needs, which is not described herein again.
With reference to fig. 1, the dual-power heat pump refrigeration unit of the present embodiment further includes a first parallel refrigerant flow path 4 and a second parallel refrigerant flow path 5.
One branch of the first parallel refrigerant passage 4 is connected in series with a refrigerant pump 40 and a first pump switching valve 41, and the other branch is provided with a first press switching valve 42.
One branch of the second parallel refrigerant flow path 5 is connected in series with a main throttling element 50 and a second press switching valve 51, and the other branch is provided with a second pump switching valve 52. It should be noted that the number of the second parallel refrigerant paths 5 depends on the number of the evaporators 3, that is, the number is equal to the number of the evaporators 3, and each evaporator 3 is connected in series with one second parallel refrigerant path 5.
The first parallel refrigerant flow path 4 and the second parallel refrigerant flow path 5 are connected in series to the refrigerant outlet of the condenser 2 and the refrigerant inlet of the evaporator 3 in the refrigerant flow direction, and the refrigerant pump 40 provides power for driving the refrigerant to flow from the condenser 2 to the evaporator 3.
With reference to fig. 1, in the present embodiment, the branch of the refrigerant pump 40 of the first parallel refrigerant flow path 4 is further connected in series with a first pump check valve 43, and the first pump check valve 43 is used for allowing the refrigerant to flow from the refrigerant pump 40 to the second parallel refrigerant flow path 5, so as to prevent the refrigerant from flowing backwards.
Similarly, a branch of the second pump switch valve 52 of the second parallel refrigerant path 5 is connected in series with a second pump check valve 53, and the second pump check valve 53 is used for allowing the refrigerant to flow from the second pump switch valve 52 to the evaporator 3.
So far, the main refrigerant circulation loop of the dual-power heat pump refrigerating unit is introduced in more detail, the unit comprises a refrigeration mode of the compressor 1 and a refrigeration mode of the refrigerant pump 40, and the refrigeration principles of the two operation modes are explained in detail with reference to fig. 1 and 4.
A compressor refrigeration mode:
referring to fig. 1, the water pumps 23 of the compressor 1 and the condenser 2 are started, the first main switch valve 10, the first press switch valve 42 and the second press switch valve 51 are opened, the refrigerant pump 40, the first pump switch valve 41 and the second pump switch valve 52 are closed, the compressor enters a refrigeration mode at this time, the water pumps 23 pump the cooling water in the water tank at the bottom of the tower body 20 into the spraying system, the cooling water is sprayed onto the fin heat exchanger 21 from the spray head of the spraying system, the air outside the tower body 20 is also sucked into the tower body 20 under the action of the fan, and is discharged out of the tower body 20 from the air supply opening 20o after being exchanged with the fin heat exchanger 21 and the cooling water; meanwhile, the high-temperature and high-pressure gaseous refrigerant in the compressor 1 enters the fin heat exchanger 21 through the first main check valve 12, enters the reservoir 17 after being subjected to heat exchange with cooling water and cold air to release heat and reduce temperature, then flows into the main throttling element 50 through the first press switching valve 42 and the second press switching valve 51, enters the air-cooled heat exchanger 30 of the evaporator 3 after being throttled and reduced in pressure by the main throttling element 50, enters the gas-liquid separator 18 through the first main switching valve 10 after being subjected to heat exchange with the environment where the evaporator 3 is located to absorb heat, and returns to the compressor 1 from the air suction port after being subjected to gas-liquid separation by the gas-liquid separator 18, so that the circulating refrigeration is realized. The refrigeration mode of the compressor 1 is mainly suitable for seasons with relatively high outdoor temperature such as spring, summer and autumn.
Cooling mode of the refrigerant pump 40:
referring to fig. 2, the compressor 1, the water pump 23, the first main switching valve 10, the first press switching valve 42, and the second press switching valve 51 are turned off, the refrigerant pump 40 is turned on, and the second main switching valve 11, the first pump switching valve 41, and the second pump switching valve 52 are turned on, at which time, the cooling mode of the refrigerant pump 40 is entered. Under the action of the refrigerant pump 40, the refrigerant in the condenser 2 directly flows into the air-cooled heat exchanger 30 of the evaporator 3 through the reservoir 17, the first pump switch valve 41, the first pump check valve 43, the second pump switch valve 52 and the second pump check valve 53, exchanges heat with the ambient air in which the evaporator 3 is located to absorb heat, and then returns to the condenser 2 through the second main switch valve 11 and the second main check valve 13, thus performing circulating refrigeration. The cooling mode of the refrigerant pump 40 is mainly suitable for winter.
Therefore, the dual-power heat pump refrigerating unit of the embodiment ensures the throttling and pressure reducing requirements before the refrigerant enters the evaporator 3 in the refrigerating mode of the compressor 1 by additionally arranging the first parallel refrigerant flow path 4 and the second parallel refrigerant flow path 5, and simultaneously the refrigerant directly enters the evaporator 3 without throttling and pressure reducing in the refrigerating mode of the refrigerant pump 40, so that the problem of insufficient circulating power in the unit caused by the offset of a throttling element on partial power of the refrigerant pump 40 in the prior art is solved, the sufficient circulating power for driving the refrigerant to flow in the unit is ensured, and the refrigerating effect of the unit is improved.
With continued reference to fig. 1, the dual-power heat pump refrigeration unit of the present embodiment further includes an unloading bypass 6, and when the operating pressure ratio of the compressor 1 exceeds the allowable set pressure ratio threshold value, the unloading bypass 6 is used to relieve pressure to reduce the operating pressure ratio of the unit.
In detail, the unloading bypass 6 comprises a bypass switch valve 60 and a bypass throttling element 61 which are arranged in parallel, the unloading bypass 6 is communicated with the exhaust port and the suction port of the compressor 1, and the communication end of the unloading bypass 6 and the exhaust port of the compressor 1 is positioned at the upstream side of the first main check valve 12 and is used for reducing the pressure ratio in the system and further assisting in starting and stopping the compressor 1.
The double-power heat pump refrigerating unit also comprises a load balance valve 14 which is communicated with the exhaust port and the suction port of the compressor 1, and the communication end of the load balance valve 14 and the exhaust port of the compressor 1 is positioned at the downstream side of the first main check valve 12 and is mainly used for energy regulation and surge control of the compressor 1.
The double-power heat pump refrigerating unit also comprises a cooling switch valve 15 and a cooling throttling element 16, wherein one port of the cooling switch valve 15 is communicated with a refrigerant outlet of the condenser 2 through a liquid storage device 17, and the other port of the cooling switch valve 15 is communicated with a suction port of the compressor 1 through the cooling throttling element 16 and is directly communicated with a cooling port of the compressor 1.
The two cooling loops can meet the cooling requirement of the compressor 1, and can also prevent the problem of high suction superheat degree caused by gas separation of a refrigerant in the gas-liquid separator 18 through the cooling throttling element 16.
In this embodiment, the first main switching valve 10 and the second main switching valve 11 are specifically butterfly valves, the first press switching valve 42 and the first pump switching valve 41 are electric ball valves, the main throttle element 50 is a thermal expansion valve or an electronic expansion valve, and the cooling throttle element 16 and the bypass throttle element 61 are electronic expansion valves.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The utility model provides a double dynamical heat pump refrigerating unit, its characterized in that, the gas vent of double dynamical heat pump refrigerating unit's compressor communicates with the refrigerant entry of condenser, and the induction port of compressor communicates through first main switch valve with the refrigerant export of evaporimeter, the refrigerant entry of condenser with the refrigerant export of evaporimeter passes through second main switch valve and communicates, double dynamical heat pump refrigerating unit still includes:
one branch of the first parallel refrigerant flow path is connected with a refrigerant pump and a first pump switch valve in series, and the other branch is provided with a first press switch valve;
one branch of the second parallel refrigerant flow path is connected with a main throttling element and a second press switch valve in series, and the other branch is provided with a second pump switch valve;
the first parallel refrigerant flow path and the second parallel refrigerant flow path are sequentially connected in series between a refrigerant outlet of the condenser and a refrigerant inlet of the evaporator along a refrigerant flow direction, and the refrigerant pump is used for providing circulating power for driving the refrigerant to flow from the condenser to the evaporator.
2. The hybrid heat pump refrigeration unit of claim 1, wherein the condenser comprises:
the tower body is provided with an air inlet and an air outlet;
a fin heat exchanger disposed in the tower body and provided with the refrigerant inlet and the refrigerant outlet of the condenser;
the spraying mechanism is arranged in the tower body and is positioned above the fin heat exchanger;
the water pump is communicated with the spraying mechanism and is used for providing spraying liquid for the spraying mechanism;
and the condensation fan is arranged at the air supply port.
3. The hybrid heat pump refrigeration unit of claim 2, wherein the finned heat exchanger is a V-shaped finned heat exchanger.
4. The hybrid heat pump refrigeration unit as recited in claim 3 wherein the air inlet comprises a first air inlet and a second air inlet, the first air inlet is disposed on the left side wall of the tower body and below the fin heat exchanger, the second air inlet is disposed at the top of the tower body and directly above the fin heat exchanger, and the air supply outlet is disposed at the top of the tower body and right side of the fin heat exchanger.
5. The hybrid heat pump refrigeration unit according to any one of claims 1 to 4, wherein a first main check valve is connected in series between the discharge port of the compressor and the refrigerant inlet of the condenser, and the first main check valve is configured to allow refrigerant to flow from the compressor to the condenser.
6. The dual-power heat pump refrigeration unit as recited in claim 5 further comprising an unloading bypass, the unloading bypass comprising a bypass on-off valve and a bypass throttling element arranged in parallel, the unloading bypass communicating with the discharge port and the suction port of the compressor, and a communication end of the unloading bypass with the discharge port being located on an upstream side of the first main check valve.
7. The hybrid heat pump refrigeration unit according to claim 5, further comprising a load balancing valve that communicates between the discharge port and the suction port of the compressor, and a communication end of the load balancing valve with the discharge port is located on a downstream side of the first main check valve.
8. The hybrid heat pump refrigeration unit according to any one of claims 1 to 4, further comprising a cooling on-off valve and a cooling throttling element, wherein one port of the cooling on-off valve is communicated with the refrigerant outlet of the condenser, and the other port of the cooling on-off valve is communicated with the suction port of the compressor through the cooling throttling element and is also directly communicated with the cooling port of the compressor.
9. The hybrid heat pump refrigeration unit according to any one of claims 1 to 4, wherein the hybrid heat pump refrigeration unit comprises a plurality of evaporators, the plurality of evaporators are arranged in parallel, and a branch of each evaporator is connected with the second parallel refrigerant flow path in series.
10. The hybrid heat pump refrigeration unit according to any one of claims 1 to 4, wherein the compressor is an oil-free magnetic levitation compressor.
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| CN202110241554.0A CN113137773A (en) | 2021-03-04 | 2021-03-04 | Double-power heat pump refrigerating unit |
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| CN202110241554.0A CN113137773A (en) | 2021-03-04 | 2021-03-04 | Double-power heat pump refrigerating unit |
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| CN113137773A true CN113137773A (en) | 2021-07-20 |
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| CN202110241554.0A Pending CN113137773A (en) | 2021-03-04 | 2021-03-04 | Double-power heat pump refrigerating unit |
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