CN115523689A - Variable frequency air conditioner and refrigerating system thereof - Google Patents
Variable frequency air conditioner and refrigerating system thereof Download PDFInfo
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- CN115523689A CN115523689A CN202110712322.9A CN202110712322A CN115523689A CN 115523689 A CN115523689 A CN 115523689A CN 202110712322 A CN202110712322 A CN 202110712322A CN 115523689 A CN115523689 A CN 115523689A
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- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000005057 refrigeration Methods 0.000 claims description 60
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- 238000009833 condensation Methods 0.000 claims description 4
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- 230000005611 electricity Effects 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20354—Refrigerating circuit comprising a compressor
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/077—Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
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Abstract
The invention provides a variable frequency air conditioner and a refrigerating system thereof. Wherein inverter air conditioner's refrigerating system includes: the compressor is used for providing power for refrigerant circulation under the driving of the electric control board; the condenser assembly is connected with a gas outlet of the compressor and is used for cooling the refrigerant discharged by the compressor, and the condenser assembly comprises a first condenser; the gas-liquid separator is arranged at the downstream of the first condenser and used for separating the refrigerant discharged by the first condenser into liquid refrigerant and gaseous refrigerant; the heat dissipation pipeline is connected with the liquid outlet of the gas-liquid separator and used for introducing liquid refrigerant to flow; the heat dissipation plate is arranged at the high-temperature area of the electric control plate and provided with a pipe groove matched with the heat dissipation pipeline, and at least part of the heat dissipation pipeline penetrates through the pipe groove so as to take away part of heat of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation pipeline. The scheme of the invention reduces the size and the cost of the heat dissipation plate.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a variable frequency air conditioner and a refrigerating system thereof.
Background
A high-power electric control device is arranged in a strong current area of an electric control plate (or called a frequency conversion plate) in a household frequency conversion air conditioner, and the heat dissipation problem is a technical problem which needs to be solved urgently. Especially, the heat productivity of IPM (Intelligent Power Module) in the high-Power electronic control device is about 60% of the total heat productivity, and the heat flow density is the highest.
The high-power electronic control device needs to be provided with a special heat dissipation module, and the heat dissipation module generally comprises a temperature equalization plate and heat dissipation fins. Heat-conducting silicone grease is coated between the high-power device and the temperature-equalizing plate, and the high-power device and the temperature-equalizing plate are tightly combined through a fastening piece; and the other side of the temperature equalizing plate is provided with a radiating fin, and the radiating fin is used for radiating heat to the surrounding air in a convection heat exchange mode.
The traditional heat dissipation mode of the electric control plate mainly realizes heat dissipation by means of convection heat transfer of ambient airflow of a condenser to the heat dissipation fins. Because the condenser is a high-temperature component, the temperature of the air flow passing through the condenser is also obviously increased, and the cooling effect of the electric control device is seriously influenced. Especially under the condition of high outdoor environment temperature, the working temperature of the electric control device is very high, heat dissipation is urgently needed, the temperature of the condenser is also increased under the working condition, and the temperature of air flow passing through the condenser is higher than that of natural air flow by more than 15 ℃. At the moment, the heat dissipation condition of electric control devices such as IPM and the like is easy to worsen, and the compressor can only reduce the running frequency so as to reduce the heat productivity of the electric control devices, thereby greatly reducing the cold quantity of the whole machine.
In order to ensure the cooling effect, the solution of the prior art is to use a larger-sized heat dissipation fin, which will cause the consumption of cooling module to be large, and further cause the cost to be greatly increased.
Disclosure of Invention
The invention aims to provide a variable frequency air conditioner capable of improving the heat dissipation efficiency of an electric control plate and a refrigerating system thereof.
A further object of the present invention is to improve the cooling effect and cooling efficiency.
Another further object of the present invention is to achieve a good cooling effect of the electric control panel with a small amount of refrigerant.
According to one aspect of the present invention, there is provided a refrigeration system of an inverter air conditioner, comprising:
the compressor is used for providing power for refrigerant circulation under the driving of the electric control board;
a condenser assembly connected to a discharge port of the compressor for cooling a refrigerant discharged from the compressor, wherein the condenser assembly includes a first condenser;
a gas-liquid separator disposed downstream of the first condenser for separating the refrigerant discharged from the first condenser into a liquid refrigerant and a gaseous refrigerant;
the heat dissipation pipeline is connected with the liquid outlet of the gas-liquid separator and used for introducing liquid refrigerant to flow;
a heat dissipation plate arranged at the high-temperature region of the electric control plate and provided with a pipe groove matched with the heat dissipation pipeline, and
at least part of the heat dissipation pipeline is arranged in the pipe groove in a penetrating mode so as to take away heat of part of the heat dissipation plate by utilizing the flowing refrigerant in the pipe groove.
Optionally, the refrigeration system of the inverter air conditioner further comprises an evaporator assembly connected to the return air port of the compressor for evaporating the refrigerant flowing through the evaporator assembly;
the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so as to enable the liquid outlet of the gas-liquid separator to be communicated with the evaporator assembly; or
The heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so as to enable the liquid outlet of the gas-liquid separator to be communicated with the compressor.
Optionally, the refrigeration system of the inverter air conditioner further includes a first throttling device connected in series to the heat dissipation pipeline for throttling the refrigerant in the heat dissipation pipeline.
Optionally, the first throttling device is connected in series between the liquid outlet of the gas-liquid separator and the heat dissipation plate.
Optionally, the first throttling device is connected in series downstream of the heat sink.
Optionally, the first throttling means is such that the flow rate of the refrigerant in the heat dissipation pipe is 0.003 to 0.5 times the flow rate of the refrigerant in the compressor.
Optionally, the condenser assembly further comprises:
the second condenser is connected with the air outlet of the gas-liquid separator and is used for cooling the gaseous refrigerant discharged by the gas-liquid separator;
the refrigerating system of inverter air conditioner still includes:
and the second throttling device is connected between the second condenser and the evaporator assembly and used for throttling the refrigerant discharged by the second condenser.
Optionally, the pipe slots are uniformly arranged in the heat dissipation plate, and the extending configuration of the condensation connecting pipe is matched with the arrangement shape of the pipe slots;
the area of contact of chase and heat dissipation pipeline is first area of contact, and the area of contact of automatically controlled board and heating panel is the second contact surface, and first area of contact is 1 to 6 times of second area of contact.
Optionally, the heat dissipation plate includes:
the first plate body is used for covering a high-temperature area of an electric control plate of the compressor, and a first groove is formed in the second side of the first plate body;
the second plate body is arranged on the second side of the first plate body, and a second groove corresponding to the first groove is formed in the plate surface of the second plate body opposite to the first plate body, so that the first groove and the second groove can define the pipe groove together.
According to another aspect of the invention, an inverter air conditioner is provided, and the inverter air conditioner comprises a refrigerating system of any one of the inverter air conditioners.
According to the refrigeration system of the variable frequency air conditioner, the gas-liquid separator is arranged at the downstream of the first condenser, the refrigerant is separated into the liquid refrigerant and the gaseous refrigerant through the gas-liquid separation gas, the heat dissipation pipeline is connected with the liquid outlet of the gas-liquid separator, the heat dissipation pipeline is introduced into the heat dissipation plate, and the heat of part of the electric control plate is taken away by the flowing refrigerant, so that the problems of low heat dissipation efficiency and complex structure due to the fact that the heat dissipation is conducted only through air convection are solved. And the cost of the heat sink device is reduced due to the reduced size of the heat sink.
Further, in the refrigeration system of the variable frequency air conditioner, the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so as to enable the liquid outlet of the gas-liquid separator to be communicated with the evaporator assembly, if the refrigerant is still in a liquid state or a gas-liquid mixture after the electric control panel is cooled, the liquid state or gas-liquid mixed state refrigerant is input into the evaporator assembly so as to further release cold energy to realize air conditioning refrigeration, the refrigeration capacity of the liquid state or gas-liquid mixed state refrigerant can be fully utilized, electric energy is saved, and the refrigeration efficiency is improved. Or the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so as to enable the liquid outlet of the gas-liquid separator to be communicated with the compressor. The gaseous refrigerant is directly introduced into the compressor, so that the recycling of the refrigerant can be accelerated, and the refrigeration efficiency is improved. Meanwhile, the phenomenon that the evaporation of other liquid refrigerants is influenced and the refrigeration effect of the evaporator assembly is seriously influenced because the gaseous refrigerant with limited released cold quantity is introduced into the evaporator assembly is avoided.
Furthermore, the first throttling device is connected between the liquid outlet of the gas-liquid separator and the heat dissipation plate in series. The refrigerant flowing through the heat dissipation plate is the refrigerant after throttling, the temperature of the refrigerant is low, and the cooling effect on the heat dissipation plate can be achieved by using a small amount of refrigerant.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention;
FIG. 5 is a schematic view of an outdoor unit electrical control box in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an electronic control board in a refrigeration system of an inverter air conditioner according to one embodiment of the invention;
FIG. 7 is a schematic view of a heat sink plate in a refrigeration system of an inverter air conditioner according to an embodiment of the invention;
FIG. 8 is an exploded view of a cooling plate in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;
FIG. 9 is a schematic block diagram of an inverter air conditioner according to one embodiment of the present invention;
FIG. 10 is a schematic block diagram of an inverter air conditioner according to one embodiment of the present invention; and
fig. 11 is a schematic view of an outdoor unit in a variable frequency air conditioner according to an embodiment of the present invention.
Detailed Description
The embodiment provides a refrigerating system of an inverter air conditioner. FIG. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the invention. The refrigeration system is implemented by using a compression refrigeration cycle, as shown in fig. 1, the compression refrigeration cycle realizes heat transfer by using a compression phase change cycle of a refrigerant in a compressor 110, a condenser assembly 120, an evaporator assembly 140 and a throttling device 131.
The compressor 110 is driven by a motor to rotate continuously as power of a refrigeration cycle, draws out gaseous refrigerant in the evaporator, and increases the pressure and temperature of the refrigerant vapor by compression, thereby creating a condition for transferring the heat of the refrigerant vapor to an external environment medium, that is, the compressor 110 compresses the low-temperature and low-pressure refrigerant vapor to a high-temperature and high-pressure state.
The condenser assembly 120 is a heat exchange device, and takes away heat of the high-temperature and high-pressure refrigerant vapor from the compressor 110 by using an ambient cooling refrigerant, so that the high-temperature and high-pressure refrigerant vapor is cooled and condensed into a high-pressure and normal-temperature refrigerant liquid.
The high-pressure normal-temperature refrigerant liquid passes through the throttling device to obtain low-temperature low-pressure refrigerant, and then is sent into the evaporator assembly 140 for heat absorption and evaporation. The temperature of the refrigerant liquid can be lowered by lowering the pressure of the refrigerant liquid according to the principle of correspondence between the saturation pressure and the saturation temperature.
The evaporator assembly 140 serves as another heat exchange device, in which the throttled low-temperature and low-pressure refrigerant liquid evaporates (boils) to become vapor, thereby absorbing ambient heat and lowering ambient temperature to achieve the purpose of refrigeration.
In an air conditioner, the evaporator assembly 140 is generally disposed in an indoor environment for exchanging heat with indoor air to achieve indoor cooling. The condenser assembly 120 is disposed in an outdoor environment for heat exchange with an outdoor space to discharge heat to the outside.
In some embodiments, the refrigeration system may further include a reversing valve to change the flow direction of the refrigerant and to alternate the functions of the evaporator assembly and the condenser assembly to perform the cooling or heating function. The switching between the cooling and heating functions by reversing the refrigerant is well known to those skilled in the art and will not be described herein. Those skilled in the art can easily add a reversing valve to the refrigeration system provided in this embodiment.
Inverter air conditioners use inverter compressors. The rotational speed of the compressor 110 is adjusted according to the refrigeration demand. Thereby increasing the cooling capacity of the air conditioner by increasing the rotation speed of the compressor 110. The variable frequency air conditioner improves the electric energy efficiency by using a variable frequency technology and reduces the temperature fluctuation. The frequency conversion technology is to change the power supply frequency of the compressor 110 by a series of processing such as rectification, filtering, inversion and the like on the ac power of the power grid, and generally implements its function through an electronic control board. Since the frequency conversion technique itself is well known to those skilled in the art, it will not be described herein.
For a split type air conditioner, the compressor 110 and its electric control board are disposed in the outdoor unit. The high-power electric control device on the electric control board can seriously generate heat in the operation process. The existing convection heat dissipation method cannot realize reliable heat dissipation. Moreover, since the electronic control board has strong electricity, the safety regulations for electricity also need to be considered when arranging the electronic control board, which further makes the arrangement of the heat dissipation device on the electronic control board difficult.
In view of the above problem, as shown in fig. 1, the cooling system of the inverter air conditioner of the present embodiment is additionally provided with a heat dissipation plate 210, and the heat dissipation of the electronic control board is realized by using the refrigerant in the cooling system. In the refrigeration system, the compressor 110 is used for providing power for refrigerant circulation under the driving of the electronic control board, and the power supply frequency is adjusted through the electronic control board, so that the adjustment of the rotating speed is realized. A condenser assembly 120 is connected to a discharge port of the compressor 110 for cooling the refrigerant discharged from the compressor 110, wherein the condenser assembly 120 includes a first condenser 121. The gas-liquid separator 150 is disposed downstream of the first condenser 121 to separate the refrigerant discharged from the first condenser 121 into a liquid refrigerant and a gaseous refrigerant. The heat dissipating pipe 160 is connected to the liquid outlet of the gas-liquid separator 150 to introduce the liquid refrigerant for the refrigerant to flow. The heat dissipation plate 210 is disposed at a high temperature region of the electronic control board, and is provided with a pipe groove matched with the heat dissipation pipeline 160, and at least a part of the heat dissipation pipeline 160 penetrates through the pipe groove, so that a part of heat of the heat dissipation plate 210 is taken away by using a refrigerant flowing therein, thereby achieving heat dissipation. The evaporator assembly 140 is connected to the return air port of the compressor 110, and the heat dissipation pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator 140.
In some embodiments, as shown in fig. 1, the refrigeration system of the inverter air conditioner further includes a first throttling device 131, and the first throttling device 131 is connected in series to the heat dissipation pipe 160 and is used for throttling the refrigerant in the heat dissipation pipe 160 to fully realize the refrigeration effect of the refrigerant in the heat dissipation pipe 160.
The liquid outlet of the gas-liquid separator is connected with the heat dissipation pipeline 160, the heat dissipation pipeline 160 is communicated into the heat dissipation plate 210, and the heat of part of the electric control plate is taken away by the flowing liquid refrigerant, so that the problems of low heat dissipation efficiency and complex structure caused by the fact that only air is used for convection are solved. And the cost of the heat sink device is reduced due to the reduced size of the heat sink plate 210.
In addition, the temperature of the refrigerant in the heat dissipation pipeline 160 is higher than the ambient environment, and the refrigerant is used to take away the temperature of the heat dissipation plate 210, so that the problem of condensation caused by the fact that the temperature of the heat dissipation plate 210 is lower than the ambient environment can be avoided, and the electrical safety performance is also improved.
In addition, the gas-liquid separator 150 is additionally arranged, and a liquid outlet of the gas-liquid separator is connected with the heat dissipation pipeline 160, so that the liquid refrigerant is used for cooling the heat dissipation plate 210, sufficient heat dissipation of the heat dissipation plate 210 is ensured, and the gas refrigerant is prevented from influencing the throttling effect of the first throttling device 131.
In some embodiments, as shown in fig. 1, the condenser assembly 120 further comprises a second condenser 122, the second condenser 122 is connected to the gas outlet of the gas-liquid separator 150, and the second condenser 122 is used for cooling the gaseous refrigerant discharged from the gas-liquid separator 150. The refrigerating system of the inverter air conditioner further comprises a second throttling device 132, and the second throttling device 132 is connected between the second condenser 122 and the evaporator assembly 140 and is used for throttling the refrigerant discharged by the second condenser 122. The second condenser 122 is used for further cooling the gaseous refrigerant to obtain a liquid refrigerant, so as to fully exert the refrigeration effect of the refrigerant on the evaporator assembly 140, and ensure the refrigeration effect of the whole refrigeration system. Gaseous refrigerant is also prevented from affecting the throttling effect of the second throttling means 132.
In some embodiments, the first throttling device 131 allows the refrigerant flow rate in the heat dissipation pipe 160 to be 0.003 to 0.5 times the refrigerant flow rate in the compressor 110. The first throttling device 131 enables the flow rate of the refrigerant in the heat dissipation pipe 160 to be controlled by the multiple of the flow rate of the refrigerant in the compressor 110, and the setting can meet the requirements of different working conditions. For example, if the electrical control box 230 reaches a low cooling temperature or the refrigerant in the heat dissipation pipe 160 is not completely vaporized, the flow rate of the refrigerant in the heat dissipation pipe 160 may be increased appropriately. If the electronic control box 230 reaches a higher cooling temperature or the refrigerant in the heat dissipation pipe 160 is completely vaporized, the flow rate of the refrigerant in the heat dissipation pipe 160 can be appropriately reduced. The first throttling device 131 is not limited to a specific manner of adjusting the flow rate of the refrigerant in the heat dissipation pipe, and may be, for example, an electronic expansion valve, a mechanical method, a series of capillary tubes with different inner diameters, or the like.
FIG. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention; FIG. 2 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention; FIG. 3 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention; FIG. 4 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention. On the basis of the above embodiment, the refrigeration system of the inverter air conditioner further includes an evaporator assembly 140, and the evaporator assembly 140 is connected to the return port of the compressor 110 and is used for evaporating the refrigerant flowing through the evaporator assembly 140. As shown in fig. 1 and 3, a heat dissipation conduit 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator assembly 140 to communicate the liquid outlet of the gas-liquid separator 150 with the evaporator assembly 140. Alternatively, as shown in fig. 2 and 4, a heat dissipation pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the compressor 110 to communicate the liquid outlet of the gas-liquid separator 150 with the compressor 110.
The heat dissipation pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator assembly 140 to communicate the liquid outlet of the gas-liquid separator 150 with the evaporator assembly 140, so that the refrigeration efficiency of the refrigeration system can be improved. Specifically, if the refrigerant is still in a liquid state or a gas-liquid mixture after cooling the electric control board 230 according to a specific working condition, the liquid state or gas-liquid mixture state refrigerant is input into the evaporator assembly 140 to further release cold energy to realize air conditioner refrigeration, so that the refrigeration capacity of the liquid state or gas-liquid mixture state refrigerant can be fully utilized, electric energy is saved, and the refrigeration efficiency is improved.
In addition, the heat dissipating pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the compressor 110 to communicate the liquid outlet of the gas-liquid separator 150 with the compressor 110, so that the cooling efficiency and the cooling effect can be improved. Specifically, if the refrigerant is gaseous in the heat dissipation pipe 160 after cooling the electric control board 230, the gaseous refrigerant is introduced into the compressor. The gaseous refrigerant is directly introduced into the compressor 110 to accelerate the circulation of the refrigerant, thereby improving the refrigeration efficiency. Meanwhile, the gaseous refrigerant with limited released cold quantity is prevented from being introduced into the evaporator assembly 140, so that the evaporation of other liquid refrigerants is influenced, and the refrigeration effect of the evaporator assembly 140 is seriously influenced. In summary, the above embodiments provide different options under different working conditions to improve the refrigeration capacity and the refrigeration efficiency of the refrigeration system.
In some embodiments, the refrigeration system of the inverter air conditioner further includes a first throttling device 131, and the first throttling device 131 is connected in series to the heat dissipation pipe 160 and is used for throttling the refrigerant in the heat dissipation pipe 160 to fully realize the refrigeration effect of the refrigerant in the heat dissipation pipe 160. Specifically, as shown in fig. 3 and 4, the first throttle device 131 is connected in series downstream of the heat dissipation plate 210. Alternatively, as shown in fig. 1 and fig. 2, the first throttling device 131 is connected in series between the liquid outlet of the gas-liquid separator 150 and the heat dissipating plate 210.
The first throttling device 131 is connected in series between the liquid outlet of the gas-liquid separator 150 and the heat dissipation plate 210, so that the refrigerant flowing through the heat dissipation plate 210 is throttled, the temperature of the refrigerant is low, and the cooling effect on the heat dissipation plate 210 can be achieved by using a small amount of refrigerant. In this embodiment, the first throttling device 131 is disposed in such a way that the electronic control box 230 can be cooled to a lower temperature, which may be lower than the temperature of the ambient air flow or the liquid refrigerant after dissipating heat from the electronic control box 230, so as to prevent the electronic control box 230 from being rapidly deteriorated in a high-temperature environment.
The first throttling device 131 is connected in series with the downstream of the heat dissipation plate 210, so that the refrigerant in the heat dissipation pipeline 160 is evaporated in the evaporator assembly 140, the refrigeration capacity of the refrigerant is fully utilized, and the refrigeration effect of the whole refrigeration system is improved.
In the split type inverter air conditioner, the compressor 110, the electric control board thereof, the heat dissipation plate 210, and the condenser assembly 120 are all disposed on the outdoor unit. Generally, the electronic control board is generally disposed in an electronic control box, and the electronic control box is integrally disposed above the compressor 110. FIG. 5 is a schematic diagram of an electronic control box in a refrigerating system of an inverter air conditioner according to one embodiment of the invention, and FIG. 6 is a schematic diagram of an electronic control board in the refrigerating system of the inverter air conditioner according to one embodiment of the invention; FIG. 7 is a schematic diagram of a heat sink plate in a refrigeration system of an inverter air conditioner according to an embodiment of the invention; fig. 8 is an exploded view of a radiating plate in a refrigerating system of an inverter air conditioner according to an embodiment of the present invention.
The electric control box 220 has a rectangular parallelepiped box shape, and is generally disposed on the top of the area where the compressor 110 is located in the outdoor unit. The electronic control board 230 is disposed inside the electronic control box 220. The heat dissipation duct 160 enters the electronic control box 220 from the side of the electronic control box 220 opposite to the area where the condenser assembly 120 is located, and finally enters the heat dissipation plate 210. The high power electronic control devices on the electronic control board 230 are generally centrally located. The arrangement position and the coverage area of the heat dissipation plate 210 are set according to the arrangement state of the high-power electronic control devices on the electronic control board 230.
The pipe slots are uniformly arranged in the heat dissipation plate 210, and the extending configuration of the heat dissipation pipe 160 is adapted to the arrangement shape of the pipe slots. The distribution of the pipe grooves may be configured according to the size and structure of the heat dissipation plate 210. For example, for the heat dissipation plate 210 shown in fig. 5-8, the length direction is significantly larger than the width direction, the tube slots may be a plurality of tubes parallel to the length direction. The heat dissipation tube 160 is embedded in the tube slot and forms a U-shaped connecting section 124 on the other side of the opening direction.
The contact area between the pipe slot and the heat dissipation pipe 160 is a first contact area, the contact area between the electronic control board 230 and the heat dissipation plate 210 is a second contact area, and the first contact area is 1 to 6 times of the second contact area.
The effective heat dissipation area of the heat dissipation pipeline is guaranteed to be a reasonable value, excessive cooling and under-cooling of the electric control board 230 are avoided, and consumables are saved while the heat dissipation effect of the electric control board 230 is guaranteed.
The heat dissipation plate 210 may include: a first plate body 211 and a second plate body 212. The first plate 211 has a first side for covering a high temperature area of the electric control board 230 of the compressor 110, and a second side having a first groove 213 formed thereon. In some embodiments, the first board body 211 may be attached to the heat generating device of the electronic control board 230 by a fastener or by gluing.
The second plate body 212 is disposed on the second side of the first plate body 211, and a second groove 214 corresponding to the first groove 213 is disposed on a surface of the second plate body opposite to the first plate body 211, so that the first groove 213 and the second groove 214 define a tube slot together. The first plate 211 and the second plate 212 may be connected by fasteners or by gluing, so as to ensure reliable combination of the two for smooth heat transfer. That is, the opposite surfaces of the first board 211 and the second board 212 are respectively formed with grooves 213 and 214, and after the first board 211 and the second board 212 are fastened, the opposite grooves 213 and 214 jointly define a pipe slot.
The cross-sectional shape of the tube slots may also be adapted to the shape of the heat dissipation tube 160, and may be, for example, circular, oval, square, rectangular, etc. In order to improve the heat transfer efficiency, in the present embodiment, it may be preferable to use the circular heat dissipation pipe 160 and the circular interface tube groove. In order to ensure higher heat exchange efficiency, heat-conducting media such as heat-conducting silica gel can be coated between the heat-radiating pipeline 160 and the inner wall of the pipe groove.
The heat dissipation plate 210 is formed with a pipe groove by combining plate bodies, so that the heat dissipation plate can be conveniently manufactured and maintained, and can be conveniently connected with a frequency conversion plate. The heat dissipation plate 210 may be made of an aluminum material to improve heat dissipation efficiency.
The embodiment also provides the inverter air conditioner. The inverter air conditioner is provided with the refrigerating system of the inverter air conditioner in any one of the embodiments. Fig. 9 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention, and fig. 10 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention. Fig. 9 and 10 omit the throttling means.
The inverter air conditioner includes an indoor unit 30 disposed in a heat exchange environment and an outdoor unit 20 disposed in an outdoor environment. The outdoor unit 20 and the indoor unit 30 are connected to each other through a refrigerant pipe and an electric line. Wherein the refrigerant pipe is used to connect a refrigerant part in the indoor unit 30 and a refrigerant part in the outdoor unit 20 into a refrigerant circulation circuit. The heat exchange between the indoor and the outdoor is realized through the circulation flow of the refrigerant.
The indoor unit 30 includes an evaporator assembly 140 (or referred to as an indoor heat exchanger), an indoor fan (not shown in the drawings), and the like, and the indoor fan may be configured to be of various structures such as a wall-mounted type, a vertical type, a ceiling type, and the like, and the indoor fan is used for promoting the formation of an air flow flowing through the evaporator assembly 140 to adjust the temperature of the indoor environment. The wind speed of the indoor fan is matched with the temperature of the evaporator assembly 140, so that the indoor environment can meet the temperature regulation requirement.
Fig. 11 is a schematic view of an outdoor unit in a variable frequency air conditioner according to an embodiment of the present invention. The outdoor unit includes a casing 201, a condenser assembly 120 (or referred to as an outdoor heat exchanger), an outdoor fan 202, a compressor 110, and a throttling device. The compressor 110 is preferably an inverter compressor driven by an inverter motor. And adjusting the rotating speed of the air conditioner according to the refrigeration requirement. The cooling capability of the air conditioner is increased by increasing the rotation speed of the compressor 110. The compressor 110 is driven by the electronic control board 230 to provide power for refrigerant circulation, and the power supply frequency is adjusted by the electronic control board 230 to adjust the rotating speed. The condenser assembly 120 serves to cool the refrigerant discharged from the compressor 110. The outdoor fan 202 generates a heat-dissipating airflow for dissipating heat from the condenser assembly 120.
The cabinet 201 may have a rectangular parallelepiped shape, and the interior thereof is partitioned by partitions into a plurality of chambers, one of which is used for disposing the compressor 110 and its accessories, and the other of which is disposed with the outdoor fan 202 and the condenser assembly 120. The outdoor fan 202 draws ambient airflow through the condenser assembly 120 to dissipate heat.
The electric control panel 230 is used for controlling the operation state of the outdoor unit 20, and includes an inverter device for driving the compressor 110. When the electric control board 230 drives the compressor 110 to operate, the power element generates heat, and the heating value may increase as the cooling load increases and the state change frequency increases. The refrigerant in condenser package 120 is directed into heat sink 210 on electronic control board 230 to carry away at least some of the heat. The refrigerant returns to the condenser assembly 120, continues to exchange heat with the ambient air flow of the outdoor fan 202, and after condensation is completed, passes through the throttling device and enters the evaporator assembly 140.
As shown in fig. 1, the gas-liquid separator 150 divides the refrigerant flowing out of the first condenser 121 into two paths, wherein one path supplies pure liquid refrigerant from the gas-liquid separator 150 to the first throttling device 131; passes through the first throttling device 131, enters the heat dissipation plate 210, and enters the evaporator 140. The other path of the refrigerant is supplied from the gas-liquid separator 150 to the second condenser 122, the second condenser 122 further cools the gaseous refrigerant to a liquid refrigerant, the liquid refrigerant flows to the second throttle device 132, and the throttled refrigerant is passed to the evaporator 140. The gas-liquid separator 150 divides the refrigerant into the gas refrigerant and the liquid refrigerant, so that the heat dissipation plate 210 can be sufficiently cooled, and the gas refrigerant is prevented from affecting the throttling effect of the first throttling device 131. Meanwhile, the first throttling device 131 is positioned between the gas-liquid separator 150 and the heat dissipation plate 210, so that the refrigerant passing through the heat dissipation plate 210 is throttled, and a good heat dissipation effect of the heat dissipation plate 210 can be achieved by using a small amount of refrigerant. The second condenser 122 is used to cool the gaseous refrigerant into a liquid refrigerant, so as to ensure the cooling effect of the entire refrigeration system, while avoiding the adverse effect of the gaseous refrigerant on the second throttling device 132.
Based on the embodiment shown in fig. 1, as shown in fig. 2, under the condition that other connection modes are not changed, the heat dissipation pipe 160 is directly connected to the air return port or the air supplement port of the compressor 110, and if the refrigerant in the heat dissipation pipe 160 flows through the heat dissipation plate 210 and is called as a gaseous refrigerant, the direct connection of the heat dissipation pipe 160 to the compressor 110 can accelerate the recycling of the refrigerant, and also can prevent the gaseous refrigerant from affecting the evaporation and heat dissipation of other refrigerants after passing through the evaporator assembly 140.
Based on the embodiment in fig. 1, as shown in fig. 3, under the condition that other connection modes are not changed, the first throttling device 131 is located downstream of the heat dissipation plate 210, and the first throttling device 131 is used for throttling the refrigerant in the heat dissipation pipe 160, so that the refrigerant absorbs heat in the evaporator 140 to achieve cooling, and the cooling effect of the cooling system is improved.
Based on the embodiment in fig. 3, as shown in fig. 4, under the condition that other connection modes are not changed, the heat dissipation pipe 160 is directly connected to the air return port or the air supplement port of the compressor 110, and if the refrigerant in the heat dissipation pipe 160 flows through the heat dissipation plate 210 and is called as a gaseous refrigerant, the direct connection of the heat dissipation pipe 160 to the compressor 110 can accelerate the recycling of the refrigerant, and also can prevent the gaseous refrigerant from affecting the evaporation and heat dissipation of other refrigerants after passing through the evaporator assembly 140.
In the embodiment, the heat of part of the electric control board 230 is taken away by the flowing refrigerant, so that the problems of low heat dissipation efficiency and complex structure caused by simply relying on air convection are solved. And the cost of the heat sink device is reduced due to the reduced size of the heat sink plate 210. Through the test of the trial-manufactured sample, under the extreme working condition that the ambient temperature of the outdoor unit 20 reaches 60 ℃, the highest temperature on the electric control board 230 is only about 65 ℃ (the temperature value is far lower than the protection temperature), and the result shows that the cooling effect is obvious, and the heat dissipation requirement of the electric control board 230 in the high-temperature extreme operation state can be met. Meanwhile, the temperature regulation function of the air conditioner is basically not affected.
It should be further noted that, in the description of the present embodiment, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A refrigerating system of an inverter air conditioner comprises:
the compressor is used for providing power for refrigerant circulation under the driving of the electric control board;
a condenser assembly connected to a discharge port of the compressor for cooling refrigerant discharged from the compressor, wherein the condenser assembly includes a first condenser;
a gas-liquid separator disposed downstream of the first condenser for separating the refrigerant discharged from the first condenser into a liquid refrigerant and a gaseous refrigerant;
the heat dissipation pipeline is connected with the liquid outlet of the gas-liquid separator and used for introducing the liquid refrigerant to flow;
a heat dissipation plate arranged at the high temperature region of the electric control plate and provided with a pipe groove matched with the heat dissipation pipeline, and
at least part of the heat dissipation pipeline penetrates through the pipe groove so as to take away part of heat of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation pipeline.
2. The refrigeration system of the inverter air conditioner of claim 1, further comprising:
an evaporator assembly connected to the return port of the compressor for evaporating the refrigerant flowing through the evaporator assembly;
the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so as to enable the liquid outlet of the gas-liquid separator to be communicated with the evaporator assembly; or
The heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so as to enable the liquid outlet of the gas-liquid separator to be communicated with the compressor.
3. The inverter air conditioner refrigeration system according to claim 1, further comprising:
and the first throttling device is connected in series with the heat dissipation pipeline and is used for throttling the refrigerant in the heat dissipation pipeline.
4. The inverter air conditioner refrigerating system according to claim 3, wherein
The first throttling device is connected between the liquid outlet of the gas-liquid separator and the heat dissipation plate in series.
5. The refrigerating system of the inverter air conditioner of claim 3, wherein
The first throttle device is connected in series downstream of the heat dissipation plate.
6. The inverter air conditioner refrigerating system according to claim 3, wherein
The first throttling means makes the flow rate of the refrigerant in the heat radiation pipe 0.003 to 0.5 times the flow rate of the refrigerant in the compressor.
7. The refrigerating system of the inverter air conditioner of claim 2, wherein
The condenser assembly further comprises:
the second condenser is connected with the air outlet of the gas-liquid separator and is used for cooling the gaseous refrigerant discharged by the gas-liquid separator;
the refrigerating system of the inverter air conditioner also comprises:
and the second throttling device is connected between the second condenser and the evaporator assembly and is used for throttling the refrigerant discharged by the second condenser.
8. The refrigerating system of the inverter air conditioner of claim 1, wherein
The pipe grooves are uniformly arranged in the heat dissipation plate, and the extending structure of the condensation connecting pipe is matched with the arrangement shape of the pipe grooves;
the pipe chase with the area of contact of heat dissipation pipeline is first area of contact, automatically controlled board with the area of contact of heating panel is the second contact surface, first area of contact is 1 to 6 times of second area of contact.
9. The refrigeration system of the inverter air conditioner of claim 8, wherein the heat radiating plate comprises:
the first side of the first plate body is used for covering a high-temperature area of an electric control plate of the compressor, and the second side of the first plate body is provided with a first groove;
the second plate body is arranged on the second side of the first plate body, and a second groove corresponding to the first groove is formed in the plate surface of the second plate body opposite to the first plate body, so that the first groove and the second groove jointly limit the pipe groove.
10. An inverter air conditioner comprising:
the refrigeration system of the inverter air conditioner according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712322.9A CN115523689A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110712322.9A CN115523689A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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