CN111765517A - Low-temperature starting air conditioning system - Google Patents
Low-temperature starting air conditioning system Download PDFInfo
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- CN111765517A CN111765517A CN202010508868.8A CN202010508868A CN111765517A CN 111765517 A CN111765517 A CN 111765517A CN 202010508868 A CN202010508868 A CN 202010508868A CN 111765517 A CN111765517 A CN 111765517A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 48
- 239000013589 supplement Substances 0.000 claims abstract description 30
- 239000003507 refrigerant Substances 0.000 claims description 89
- 239000007788 liquid Substances 0.000 claims description 70
- 238000004891 communication Methods 0.000 claims description 21
- 230000001502 supplementing effect Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 101100235345 Caenorhabditis elegans lev-9 gene Proteins 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a low-temperature starting air conditioning system, which comprises: the inlet of the low-temperature starting heat exchange device is communicated with the outlet of the secondary cooling device; the outlet of the low-temperature starting heat exchange device is communicated with a compressor of an air conditioning system; the inlet of the secondary cooling device is communicated with an inner machine of the air conditioning system; the compressor is communicated with the inner machine; the system also comprises a low-temperature starting air supplement device which is communicated with the compressor. The invention improves the air input of the compressor, establishes the starting pressure difference, realizes the normal starting of the compressor, can improve the application scene of the system and improve the product competitiveness through the combined action of the secondary cooling device, the low-temperature starting air supply device and the low-temperature starting heat exchange device in the low-temperature starting process of the compressor.
Description
Technical Field
The invention belongs to the technical field of data center heat dissipation, and particularly relates to a low-temperature starting air conditioning system.
Background
With the rapid development of the electronic information industry, the development of data centers is also entering a new stage. The reliability of the air conditioning system directly affects the security of the data center. Most of the existing data center refrigeration air conditioners are compression refrigeration cycles, most of precision air conditioners are split air conditioners, an indoor unit with cooling air is arranged on the heat source side of a machine room, an outdoor unit with a condenser and a compressor is arranged on the outdoor side, and the outdoor unit and the indoor unit are connected through refrigerant pipes. Due to the particularity of the data center, the compressor must be required to be started normally even in winter, and particularly, an air conditioner is usually required to heat the data machine room in a cold area so as to meet the temperature requirement of the air in the data center; however, when the external environment temperature is too low, the compressor cannot be started for various reasons, which seriously affects the safe and reliable operation of the data center.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a low-temperature start air conditioning system to solve the above-mentioned technical problems.
The invention provides a low-temperature starting air conditioning system, which comprises:
the inlet of the low-temperature starting heat exchange device is communicated with the outlet of the secondary cooling device; the outlet of the low-temperature starting heat exchange device is communicated with a compressor of an air conditioning system; the inlet of the secondary cooling device is communicated with an inner machine of the air conditioning system; the compressor is communicated with the inner machine;
the secondary cooling device heats a liquid refrigerant output by the internal machine, the low-temperature starting heat exchange device converts the heated liquid refrigerant into a gaseous refrigerant, and the gaseous refrigerant is supplemented to the compressor to enable the compressor to be normally started;
the system also comprises a low-temperature starting air supplement device which is communicated with the compressor and used for supplementing gaseous refrigerants to the compressor.
Further, the system further comprises:
the gas-liquid separator is respectively communicated with the compressor, the low-temperature starting gas supplementing device and the four-way valve; the outlet of the high-pressure liquid reservoir is communicated with a secondary cooling device; the inlet of the high-pressure liquid reservoir is communicated with an external machine; the outdoor unit is communicated with an outlet of the low-temperature starting heat exchange device; the inlet of the low-temperature starting heat exchange device is communicated with the four-way valve and is communicated with the compressor through the four-way valve; the secondary cooling device is connected with a gas-liquid separator; the gas-liquid separator is respectively communicated with the low-temperature starting gas supplementing device and the compressor;
after being shunted, the liquid refrigerant output from the air conditioner indoor unit is shunted and heated by a secondary cooling device, a part of the liquid refrigerant enters a low-temperature starting heat exchange device, and the low-temperature starting heat exchange device converts the liquid refrigerant into a gaseous refrigerant and then enters a compressor; the other path of refrigerant output from the secondary cooling device enters a high-pressure liquid reservoir and is taken by an external machine after being heated by the branch pipeline; the outdoor unit can convert the taken liquid refrigerant into a gaseous refrigerant and convey the gaseous refrigerant to the four-way valve, and the gaseous refrigerant enters the gas-liquid separator through the four-way valve; the gas separator performs gas-liquid separation on the refrigerant; the separated gaseous refrigerant is mainly conveyed to a compressor and is supplemented to a low-temperature starting air supplementing device; the low-temperature starting air supplement device conveys the stored gaseous refrigerant to the compressor when the compressor cannot be started.
Further, the low-temperature start air supply device comprises:
the low-temperature starting air supplement tank comprises a low-temperature starting air supplement tank, a first air supplement electromagnetic valve, a second air supplement electromagnetic valve and a capillary, wherein an outlet of the low-temperature starting air supplement tank is communicated with the compressor through the first air supplement electromagnetic valve; the inlet of the low-temperature starting air supplement tank is communicated with one end of a capillary tube; the other end of the capillary is connected with the gas-liquid separator through the second gas supplementing electromagnetic valve.
Further, the cold-start heat exchange device comprises:
the heat exchange unit comprises a heat exchanger, a heat exchange expansion valve and a heat exchange one-way valve, the heat exchange expansion valve and the heat exchange one-way valve are connected in parallel, and a parallel pipeline of the heat exchange expansion valve and the heat exchange one-way valve is connected with the heat exchanger in series; and the input end of the one-way valve is communicated with the heat exchanger.
Further, the secondary cooling device includes:
a heat conduction heat exchange box and a branch pipeline; the branch pipeline penetrates through the box body of the heat conduction heat exchange box, and the interior of the branch pipeline is isolated from the interior space of the heat conduction heat exchange box; the heat conduction heat exchange box is provided with a main path inlet and a main path outlet, and is connected to a refrigerant transmission main path of the air conditioning system through the main path inlet and the main path outlet; the two ends of the branch pipelines outside the heat conduction heat exchange box body are respectively communicated with the refrigerant transmission main pipeline through expansion pipelines, and the expansion pipelines at the two ends of the branch pipelines are respectively provided with an expansion valve; outlets are arranged at two ends of the branch pipeline, and the outlets at the two ends are respectively connected with the gas-liquid separator and the low-temperature starting heat exchange device; and the outlets at the two ends of the branch pipeline are respectively provided with an electromagnetic valve.
Furthermore, the four-way valve is communicated with a plurality of inner machines of the air conditioning system, and air pipe ball valves are arranged on communicating pipelines of the four-way valve and the inner machines.
Furthermore, the refrigerant outlets of the plurality of internal machines are all communicated with a refrigerant transmission main circuit, and a liquid pipe stop valve is arranged on the refrigerant transmission main circuit.
Furthermore, electromagnetic valves are arranged on a first communication pipeline between the secondary cooling device and the low-temperature start heat exchange device, a second communication pipeline between the secondary cooling device and the gas-liquid separator, a third communication pipeline between the outer unit and the four-way valve, a fourth communication pipeline between the outer unit and the low-temperature start heat exchange device, a fifth communication pipeline between the low-temperature start heat exchange device and the compressor, and a sixth communication pipeline between the low-temperature start heat exchange device and the third communication pipeline.
The beneficial effect of the invention is that,
according to the low-temperature start air conditioning system provided by the invention, the secondary cooling device, the low-temperature start air supplementing device and the low-temperature start heat exchange device are added in the refrigeration system, so that the amount of refrigerant required by the start of the compressor is met, and the normal start of the compressor is ensured. The invention improves the air input of the compressor, establishes the starting pressure difference, realizes the normal starting of the compressor, can improve the application scene of the system and improve the product competitiveness through the combined action of the secondary cooling device, the low-temperature starting air supply device and the low-temperature starting heat exchange device in the low-temperature starting process of the compressor.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a cold start air conditioning system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a low-temperature-start heat exchange device of a low-temperature-start air conditioning system according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a secondary cooling device of a cold start air conditioning system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a low-temperature-start air supplement device of a low-temperature-start air conditioning system according to an embodiment of the present application.
Wherein, 1, an internal machine; 2. a compressor; 3. starting the air supply device at low temperature; 31. starting an air supplement tank at low temperature; 32. a capillary tube; 4. a gas-liquid separator; 5. a secondary cooling device; 51. a heat transfer heat exchange box; 6. a high pressure reservoir; 7. an outdoor unit; 8. starting a heat exchange device at a low temperature; 81. a heat exchanger; 82. a heat exchange expansion valve; 83. a heat exchange one-way valve; 9. and a four-way valve.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Referring to fig. 1, the present embodiment provides a low temperature start air conditioning system. In a severe cold area, due to heat dissipation of the enclosure structure, heat dissipated by the data center is not enough to maintain the air temperature required by equipment of a machine room, the data machine room needs to be heated, but at outdoor low temperature, the outdoor part is in a low-pressure state, a large amount of refrigerants can flow outdoors, and when the compressor 2 is started, the compressor is difficult to start because the compressor does not have enough refrigerants to establish pressure difference; based on this, secondary cooling device 5, low temperature start-up air supplement unit 3, low temperature start-up heat transfer device 8 have been added in the refrigerating system to satisfy the required refrigerant volume of compressor 2 start-up, guarantee compressor 2 normal boot.
Specifically, the low-temperature start air conditioning system provided by this embodiment includes:
the system comprises a secondary cooling device 5 and a low-temperature starting heat exchange device 8, wherein an inlet of the low-temperature starting heat exchange device 8 is communicated with an outlet of the secondary cooling device 5, an outlet of the low-temperature starting heat exchange device 8 is communicated with a compressor 2 of the air conditioning system, an inlet of the secondary cooling device 5 is communicated with an inner machine 1 of the air conditioning system, and the compressor 2 is communicated with the inner machine 1. In addition, the system also comprises a low-temperature starting air supplement device 3, and the low-temperature starting air supplement device 3 is communicated with the compressor 2.
When the air conditioner is started at a low temperature, a liquid refrigerant flows into the secondary cooling device 5 from the air conditioner internal unit 1, part of the liquid refrigerant enters the low-temperature starting heat exchange device 8 after the secondary cooling device 5 processes initial heating processing, the liquid refrigerant is converted into a gaseous refrigerant by the low-temperature starting heat exchange device 8, the gaseous refrigerant is input into the compressor 2, and the air quantity of the compressor 2 is supplemented, so that the air conditioner compressor 2 can be normally started at the low temperature.
Example 2
The present embodiment provides a low-temperature start air conditioning system, as shown in fig. 1, which specifically includes the following structures:
the air conditioner comprises a secondary cooling device 5, a low-temperature starting heat exchange device 8, a low-temperature starting air supplement device 3, a gas-liquid separator 4, a high-pressure liquid reservoir 6 and an outer machine 7, wherein an inlet of the low-temperature starting heat exchange device 8 is communicated with an outlet of the secondary cooling device 5, an outlet of the low-temperature starting heat exchange device 8 is communicated with a compressor 2 of the air conditioning system, an inlet of the secondary cooling device 5 is communicated with an inner machine 1 of the air conditioning system, and the compressor 2 is communicated with. The gas-liquid separator 4 is respectively communicated with the compressor 2, the low-temperature starting gas supplementing device 3 and the four-way valve 9; the outlet of the high-pressure liquid receiver 6 is communicated with the secondary cooling device 5; the inlet of the high-pressure liquid receiver 6 is communicated with an outer machine 7; the outdoor unit 7 is communicated with an outlet of the low-temperature starting heat exchange device 8; the inlet of the low-temperature starting heat exchange device 8 is communicated with a four-way valve 9, and is communicated with the compressor 2 through the four-way valve 9; the secondary cooling device 5 is connected with the gas-liquid separator 4; the gas-liquid separator 4 is respectively communicated with the low-temperature starting gas supplementing device 3 and the compressor 2. In this embodiment, three air conditioner internal units 1 are adopted, the four-way valve 9 is communicated with the three internal units 1 of the air conditioning system, and the communicating pipelines of the four-way valve 9 and the three internal units 1 are respectively provided with an air pipe ball valve. The refrigerant outlets of the three inner machines 1 are all communicated with a refrigerant transmission main path, and liquid pipe stop valves are arranged on the refrigerant transmission main path. A solenoid valve SV5 is arranged in a first communication pipeline between the secondary cooling device 5 and the low-temperature start heat exchange device 8, a solenoid valve SV3 is arranged in a second communication pipeline between the secondary cooling device 5 and the gas-liquid separator 4, a solenoid valve SV11 is arranged in a third communication pipeline between the outer unit 7 and the four-way valve 9, a solenoid valve SV6 is arranged in a fourth communication pipeline between the outer unit 7 and the low-temperature start heat exchange device 8, a solenoid valve SV4 is arranged in a fifth communication pipeline between the low-temperature start heat exchange device 8 and the compressor 2, and a solenoid valve SV2 is arranged in a sixth communication pipeline between the low-temperature start heat exchange device 8 and the third communication pipeline.
As shown in fig. 2, the low-temperature-start heat exchange device 8 includes two heat exchange units (in other embodiments, more than two heat exchange units are adopted, and the number of the heat exchange units can be designed by itself), the heat exchange unit includes a heat exchanger 81, a heat exchange expansion valve 82 and a heat exchange check valve 83, the heat exchange expansion valve 82 and the heat exchange check valve 83 are connected in parallel, and a parallel pipeline of the heat exchange expansion valve 82 and the heat exchange check valve 83 is connected in series with the heat exchanger 81; wherein the input end of the one-way valve is communicated with the heat exchanger 81. The heat exchange unit of the low-temperature starting heat exchange device 8 is the same as the heat exchange units of the air conditioner internal unit 1 and the air conditioner external unit 7 in structure.
As shown in fig. 3, the secondary cooling device 5 includes a heat-transfer heat exchange tank 51 and a branch line; the branch pipeline penetrates through the box body of the heat conduction heat exchange box 51, and the interior of the branch pipeline is isolated from the interior space of the heat conduction heat exchange box 51; the heat conduction heat exchange box 51 is provided with a main path inlet and a main path outlet, and the heat conduction heat exchange box 51 is connected to a refrigerant transmission main path of the air conditioning system through the main path inlet and the main path outlet; the two ends of the branch pipeline outside the heat-conducting heat exchange box 51 are respectively communicated with the refrigerant transmission main pipeline through expansion pipelines, the expansion pipelines at the two ends of the branch pipeline are respectively provided with an expansion valve, the expansion valve on the expansion pipeline which is communicated with the air conditioner indoor unit 1 is LEV8, and the expansion valve on the expansion pipeline which is directly communicated with the high-pressure liquid reservoir 6 is LEV 9. Outlets are arranged at two ends of the branch pipeline, and the outlets at the two ends are respectively connected with the gas-liquid separator 4 and the low-temperature starting heat exchange device 8; and the outlets at the two ends of the branch pipeline are respectively provided with an electromagnetic valve, wherein the outlet of the continuous gas-liquid separator 4 is provided with an electromagnetic valve SV8, and the outlet communicated with the low-temperature starting heat exchange device 8 is provided with an electromagnetic valve SV 7.
As shown in fig. 3, the low-temperature start gas supply device 3 includes:
the low-temperature starting air supplement tank 31, the first air supplement electromagnetic valve SV9, the second air supplement electromagnetic valve SV10 and the capillary 32, wherein the outlet of the low-temperature starting air supplement tank 31 is communicated with the compressor 2 through the first air supplement electromagnetic valve SV9, the inlet of the low-temperature starting air supplement tank 31 is communicated with one end of the capillary 32, and the other end of the capillary 32 is connected with the air-liquid separator 4 through the second air supplement electromagnetic valve SV 10.
Under the condition of starting the air conditioning system at a low temperature, the air conditioning system is in a heating mode, the secondary cooling device 5 is partially used, SV2, SV3, SV6 and SV8 in a pipeline are closed, SV4, SV5 and SV7 are opened, LEV9 is closed, liquid refrigerant is divided into main refrigerant and branch refrigerant after being divided, and the branch refrigerant is heated by an expansion valve LEV8 of the secondary cooling device 5 and passes through a box body of the heat conduction and exchange box 51. The liquid refrigerant in the main refrigerant enters the heat transfer and exchange box 51 to exchange heat with the branch pipeline inside the box body. The refrigerant in the branch pipeline enters the low-temperature starting heat exchange device 8 through the solenoid valves SV7 and SV5, the liquid refrigerant is converted into a gas state by the low-temperature starting heat exchange device 8, and the gas refrigerant enters the compressor 2 from the low-temperature starting heat exchange device 8 through the solenoid valve SV 4. And the main path refrigerant output from the secondary cooling device 5 enters the high-pressure liquid receiver 6 after being heated by the branch pipeline, and is taken by the outer machine 7. The outdoor unit 7 converts the liquid refrigerant into a gaseous refrigerant, and transmits the gaseous refrigerant to the four-way valve 9 through the solenoid valve SV11, and the gaseous refrigerant enters the gas-liquid separator 4 through the four-way valve 9. The gas separator performs gas-liquid separation on the refrigerant, the separated gas refrigerant is mainly conveyed to the compressor 2, and the other part of the gas refrigerant is supplemented to the low-temperature starting gas supplementing device 3 (is supplemented to the low-temperature starting gas supplementing tank 31 through the capillary tube 32). The gaseous refrigerant in the low-temperature start air supplement tank 31 of the low-temperature start air supplement device 3 is conveyed to the compressor 2 through an electromagnetic valve SV 9. All gaseous refrigerants are compressed to the air conditioner internal unit 1 through the compressor 2, the air conditioner internal unit 1 condenses the gaseous refrigerants to release heat, the gaseous refrigerants are heated in a machine room of the data center and become high-pressure liquid, and the circulation heating is carried out.
The refrigeration process of the low-temperature start air conditioning system provided by the embodiment comprises the following steps:
the method comprises the steps of starting the heating start-up internal machine 1, then converting the heating start-up internal machine into a refrigeration mode through the four-way valve 9, enabling the compressor 2 to exhaust air, then enabling the air to enter the low-temperature start-up heat exchange device 8 through the SV2 to be condensed, then enabling the air to enter the external machine 7, enabling SV4, SV5 and SV11 to be closed, enabling SV2 and SV6 to be opened, and enabling a refrigerant after multiple times of condensation to enter the high-pressure liquid reservoir 6 through. The liquid refrigerant in the high-pressure receiver 6 is branched to the secondary cooling device 5 and output. One branch liquid refrigerant is throttled by an expansion valve LEV9, cooled and decompressed and enters a secondary cooling device 5 to cool the other main liquid refrigerant in the heat conduction heat exchange box 51, at the moment, the expansion valve LEV8 is closed, an electromagnetic valve SV7 is closed, electromagnetic valves SV3 and SV8 are opened, and the branch liquid refrigerant returns to the gas-liquid separator 4 through an electromagnetic valve SV8/SV 3. The main refrigerant output from the secondary cooling device 5 respectively enters the air conditioner indoor unit 1 through the liquid pipe stop valve, is throttled by the expansion valve of the air conditioner indoor unit 1, and is refrigerated, vaporized and evaporated into gaseous refrigerant through the evaporator. The gaseous refrigerant returns to the gas-liquid separator 4 after passing through the gas pipe ball valve and the four-way valve 9, and the gaseous refrigerant in the gas-liquid separator 4 returns to the air suction port of the compressor 2, and the circulation is carried out.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A cold start air conditioning system, said system comprising:
the low-temperature starting heat exchange device is communicated with the secondary cooling device; the low-temperature starting heat exchange device is communicated with a compressor of an air conditioning system; the secondary cooling device is communicated with an inner machine of the air conditioning system; the compressor is communicated with the inner machine;
the secondary cooling device heats a liquid refrigerant output by the internal machine, the low-temperature starting heat exchange device converts the heated liquid refrigerant into a gaseous refrigerant, and the gaseous refrigerant is supplemented to the compressor to enable the compressor to be normally started;
the system also comprises a low-temperature starting air supplement device which is communicated with the compressor and used for supplementing gaseous refrigerants to the compressor.
2. The cold start air conditioning system of claim 1, further comprising:
the gas-liquid separator is respectively communicated with the compressor, the low-temperature starting gas supplementing device and the four-way valve; the high-pressure liquid reservoir is communicated with a secondary cooling device; the high-pressure liquid reservoir is communicated with an outer machine; the outdoor unit is communicated with the low-temperature starting heat exchange device; the low-temperature starting heat exchange device is communicated with the four-way valve and is communicated with the compressor through the four-way valve; the secondary cooling device is connected with a gas-liquid separator; the gas-liquid separator is respectively communicated with the low-temperature starting gas supplementing device and the compressor;
after being shunted, the liquid refrigerant output from the air conditioner indoor unit is shunted and heated by a secondary cooling device, a part of the liquid refrigerant enters a low-temperature starting heat exchange device, and the low-temperature starting heat exchange device converts the liquid refrigerant into a gaseous refrigerant and then enters a compressor; the other path of refrigerant output from the secondary cooling device enters a high-pressure liquid reservoir and is taken by an external machine after being heated by the branch pipeline; the outdoor unit can convert the taken liquid refrigerant into a gaseous refrigerant and convey the gaseous refrigerant to the four-way valve, and the gaseous refrigerant enters the gas-liquid separator through the four-way valve; the gas separator performs gas-liquid separation on the refrigerant; the separated gaseous refrigerant is mainly conveyed to a compressor and is supplemented to a low-temperature starting air supplementing device; the low-temperature starting air supplement device conveys the stored gaseous refrigerant to the compressor when the compressor cannot be started.
3. The cold start air conditioning system of claim 1, wherein the cold start air make-up device comprises:
the low-temperature starting air supplement tank is communicated with the compressor through the first air supplement electromagnetic valve; the low-temperature starting air supplement tank is communicated with one end of the capillary tube; the other end of the capillary is connected with the gas-liquid separator through the second gas supplementing electromagnetic valve.
4. The cold-start air conditioning system of claim 1, wherein the cold-start heat exchange device comprises:
the heat exchange unit comprises a heat exchanger, a heat exchange expansion valve and a heat exchange one-way valve, the heat exchange expansion valve and the heat exchange one-way valve are connected in parallel, and a parallel pipeline of the heat exchange expansion valve and the heat exchange one-way valve is connected with the heat exchanger in series; and the input end of the one-way valve is communicated with the heat exchanger.
5. The cold start air conditioning system of claim 1, wherein the secondary cooling means comprises:
a heat conduction heat exchange box and a branch pipeline; the branch pipeline penetrates through the box body of the heat conduction heat exchange box, and the interior of the branch pipeline is isolated from the interior space of the heat conduction heat exchange box; the heat conduction heat exchange box is provided with a main path inlet and a main path outlet, and is connected to a refrigerant transmission main path of the air conditioning system through the main path inlet and the main path outlet; the two ends of the branch pipelines outside the heat conduction heat exchange box body are respectively communicated with the refrigerant transmission main pipeline through expansion pipelines, and the expansion pipelines at the two ends of the branch pipelines are respectively provided with an expansion valve; outlets are arranged at two ends of the branch pipeline, and the outlets at the two ends are respectively connected with the gas-liquid separator and the low-temperature starting heat exchange device; and electromagnetic valves are arranged at two ends of the branch pipeline.
6. The system of claim 2, wherein the four-way valve is connected to a plurality of indoor units of the air conditioning system, and a connecting pipeline between the four-way valve and the indoor units is provided with a gas pipe ball valve.
7. The system of claim 5, wherein the refrigerant outlets of the plurality of indoor units are all connected to a refrigerant main transmission path, and a liquid pipe stop valve is disposed on the refrigerant main transmission path.
8. The system of claim 2, wherein the first communication line between the secondary cooling device and the cold start heat exchanger, the second communication line between the secondary cooling device and the gas-liquid separator, the third communication line between the outdoor unit and the four-way valve, the fourth communication line between the outdoor unit and the cold start heat exchanger, the fifth communication line between the cold start heat exchanger and the compressor, and the sixth communication line between the cold start heat exchanger and the third communication line are provided with solenoid valves.
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| CN202010508868.8A CN111765517B (en) | 2020-06-06 | 2020-06-06 | Low-temperature starting air conditioning system |
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|---|---|---|---|---|
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