CN115523685A - Variable frequency air conditioner and refrigerating system thereof - Google Patents
Variable frequency air conditioner and refrigerating system thereof Download PDFInfo
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- CN115523685A CN115523685A CN202110710644.XA CN202110710644A CN115523685A CN 115523685 A CN115523685 A CN 115523685A CN 202110710644 A CN202110710644 A CN 202110710644A CN 115523685 A CN115523685 A CN 115523685A
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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
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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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- 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
Abstract
The invention provides a frequency conversion air conditioner and a refrigerating system thereof, wherein the refrigerating system comprises: the refrigeration main cycle comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially connected, wherein an outlet of the first throttling device forms a first branch and a second branch, and the first branch is connected to the evaporator; the gas-liquid separator is arranged on the second branch, the inlet of the gas-liquid separator is used for receiving part of the refrigerant flowing out of the condenser, the first outlet of the gas-liquid separator is connected to the evaporator, and the second outlet of the gas-liquid separator is connected to the air supplementing port of the compressor; the heat dissipation plate is disposed at a high temperature region of an electric control plate of the compressor, and a pipe of a first outlet of the gas-liquid separator leading to the evaporator is configured to flow through the heat dissipation plate to take away heat of a part of the heat dissipation plate with refrigerant flowing therein. The scheme of the invention utilizes the refrigerant of the condenser to radiate the electric control board, solves the problems of low radiating efficiency and complex structure, can reduce the size of the radiating board and reduce the cost of radiating devices.
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. The high-Power electric control device mainly comprises an IPM (Intelligent Power Module), an IGBT (Insulated Gate Bipolar Transistor), a diode, a rectifier bridge and the like. The IPM generates about 60% of the total heat, and has the highest heat flux density.
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-uniforming plate, and the high-power device and the temperature-uniforming plate are tightly combined through a fastening piece; the other side of the temperature equalizing plate is provided with a radiating fin which can be arranged in an axial flow air duct of an outdoor unit of the air conditioner. The IPM, the IGBT, the diode and the rectifier bridge firstly conduct heat to the heat dissipation fins through the temperature equalization plate in a heat conduction mode, and then the heat dissipation fins dissipate the heat 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 higher outdoor environment temperature, the working temperature of an electric control device is very high, heat dissipation is urgently needed, the temperature of a 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 reliability of heat dissipation of the electronic control board.
Another further object of the present invention is to reduce the cost of the components for heat dissipation from the electronic control board.
According to one aspect of the invention, a refrigeration system of an inverter air conditioner is provided, and comprises:
the refrigeration system comprises a refrigeration main cycle, a refrigeration main cycle and a refrigeration main cycle, wherein the refrigeration main cycle comprises a compressor, a condenser, a first throttling device and an evaporator which are sequentially connected, a first branch and a second branch are formed at an outlet of the first throttling device, and the first branch is connected to the evaporator;
the gas-liquid separator is arranged on the second branch, the inlet of the gas-liquid separator is used for receiving part of the refrigerant flowing out of the condenser, the first outlet of the gas-liquid separator is connected to the evaporator, and the second outlet of the gas-liquid separator is connected to the air supplementing port of the compressor;
and a heat radiating plate disposed at a high temperature region of the electric control plate of the compressor, and a pipe of the first outlet of the gas-liquid separator leading to the evaporator is configured to flow through the heat radiating plate to take away heat of a part of the heat radiating plate with refrigerant flowing therein.
Optionally, the refrigerating system of the inverter air conditioner further comprises: and one end of the air supplementing branch is connected to the second outlet of the gas-liquid separator, and the other end of the air supplementing branch is connected to an air supplementing port of the compressor, so that the gaseous refrigerant in the gas-liquid separator is guided into the compressor.
Optionally, the refrigerating system of the inverter air conditioner further comprises: and the air supply flow regulating and controlling device is arranged on the air supply branch and is used for regulating and controlling the flow of the refrigerant in the air supply branch.
Optionally, when the refrigeration system of the inverter air conditioner enters the air make-up working condition, the first throttling device is configured to throttle the refrigerant flowing out of the condenser, and the gas-liquid separator is configured to open the second outlet, so that the gaseous refrigerant separated from the gas-liquid separator enters the compressor through the air make-up branch.
Optionally, when the refrigeration system of the inverter air conditioner exits the air make-up condition, the first throttling device is configured to be fully opened, and the gas-liquid separator is configured to close the second outlet, so that the refrigerant flowing out of the condenser enters the second branch, and enters the first outlet of the gas-liquid separator after being filled with the gas-liquid separator and leads to the pipeline of the evaporator.
Optionally, the refrigerating system of the inverter air conditioner further comprises:
and the second throttling device is arranged on the first branch and is used for throttling the refrigerant in the first branch.
And the third throttling device is arranged on a pipeline leading to the evaporator from the first outlet of the gas-liquid separator and is used for throttling the refrigerant in the pipeline.
Optionally, the refrigeration system of the inverter air conditioner further includes:
the flow dividing device is arranged at the downstream of the first throttling device and used for controlling the flow of the first branch and the second branch;
a first shunt opening of the shunt device is connected with the first branch, and a second shunt opening of the shunt device is connected with the second branch.
Optionally, a pipe groove is arranged in the heat dissipation plate, and the extending structure of the pipeline leading to the evaporator from the first outlet of the gas-liquid separator is matched with the arrangement shape of the pipe groove;
the contact area of the pipe groove and the pipeline leading to the evaporator from the first outlet of the gas-liquid separator is a first contact area, the contact area of the electric control plate and the heat dissipation plate is a second contact area, and the first contact area is 1-6 times of the second contact area.
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, which comprises a refrigerating system of any inverter air conditioner.
In the refrigerating system of the variable frequency air conditioner, the outlet of the first throttling device forms a first branch and a second branch. The gas-liquid separator is arranged on the second branch, an inlet of the gas-liquid separator is used for receiving part of the refrigerant flowing out of the condenser, and a first outlet of the gas-liquid separator is connected to the evaporator. A heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor, and a pipeline leading to the evaporator from a first outlet of the gas-liquid separator is configured to flow through the heat dissipation plate so as to take away part of heat of the heat dissipation plate by utilizing refrigerant flowing in the pipeline, 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.
Furthermore, the refrigerating system of the variable frequency air conditioner utilizes the refrigerant with the temperature higher than the ambient environment for heat dissipation, so that the problem of condensation caused by the fact that the temperature of the heat dissipation plate is lower than the ambient environment can be avoided. Through practical tests, the cooling effect of the scheme of the invention is limited, and the heat dissipation requirement of the IPM and other electric control devices in a high-temperature operation state can be met.
Furthermore, the refrigerating system of the inverter air conditioner is provided with an air supplement branch, one end of the air supplement branch is connected with the second outlet of the gas-liquid separator, and the other end of the air supplement branch is connected with the air supplement port of the compressor, so that the gaseous refrigerant in the gas-liquid separator is guided into the compressor, the energy efficiency of the system is improved, and the temperature regulation effect of the air conditioner is improved.
Furthermore, in the refrigeration system of the inverter air conditioner, the flow dividing device is arranged at the downstream of the first throttling device, the first flow dividing port of the flow dividing device is connected with the first branch, and the second flow dividing port of the flow dividing device is connected with the second flow dividing branch, so that the flow of the refrigerant of the first branch and the flow of the refrigerant of the second branch can be controlled through the flow dividing device, and the heat dissipation function can be controlled.
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 an outdoor unit electrical control box in a refrigeration system of an inverter air conditioner according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an electronic control board in a refrigeration system of an inverter air conditioner according to an embodiment of the invention;
FIG. 4 is a schematic view of a heat dissipation plate in a refrigeration system of an inverter air conditioner according to an embodiment of the invention;
FIG. 5 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. 6 is a schematic block diagram of an inverter air conditioner according to one embodiment of the present invention; and
fig. 7 is a schematic view of an inverter 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 present invention. The refrigeration system is implemented by using a compression refrigeration cycle, and the compression refrigeration cycle realizes heat transfer by using a compression phase change cycle of a refrigerant in the compressor 110, the condenser 120, the evaporator 140 and the first throttling device 130.
The compressor 110 is used as a power of a refrigeration cycle, is dragged by a motor to rotate continuously, extracts a gaseous refrigerant in the evaporator, and increases the pressure and temperature of the refrigerant vapor through compression, thereby creating a condition for transferring the heat of the refrigerant vapor to an external environment medium, i.e., the compressor 110 compresses the low-temperature and low-pressure refrigerant vapor to a high-temperature and high-pressure state.
The condenser 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 refrigerant liquid at high pressure and normal temperature passes through the first throttling device 130 to obtain low-temperature and low-pressure refrigerant, and then is sent into the evaporator 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 140 serves as another heat exchange device, in which the throttled low-temperature and low-pressure refrigerant liquid is evaporated (boiled) to become vapor, thereby absorbing ambient heat, lowering ambient temperature, and achieving the purpose of refrigeration.
In an air conditioner, the evaporator 140 is generally disposed in an indoor environment for exchanging heat with indoor air to cool the indoor. The condenser 120 is disposed in an outdoor environment for heat exchange with an outdoor space to release 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 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 cooling demand. Thereby increasing the cooling capability of the air conditioner by increasing the rotation speed of the compressor 110. The variable frequency air conditioner utilizes the variable frequency technology to improve the electric energy efficiency and reduce 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 of the ac power of the power grid, and generally realizes the function thereof through an electric control board. Since the frequency conversion technique itself is well known to those skilled in the art, it will not be described herein.
For the 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 of electricity need to be considered when the electronic control board is arranged, which further causes that the heat dissipation device on the electronic control board is difficult to arrange.
In view of the above problems, the cooling system of the inverter air conditioner of the embodiment is additionally provided with the heat dissipation plate 210, and the refrigerant in the cooling system is used to realize the heat dissipation of the electric control plate. The main refrigeration cycle includes a compressor 110, a condenser 120, a first throttling device 130, and an evaporator 140 sequentially connected by refrigerant pipes, wherein an outlet of the first throttling device 130 forms a first branch 121 and a second branch 122, and the first branch 121 is connected to the evaporator. The condenser 120 is connected to a discharge port of the compressor 110 for cooling the refrigerant discharged from the compressor 110.
The refrigerating system of the inverter air conditioner of the embodiment is provided with a gas-liquid separator 170. A gas-liquid separator 170 is disposed on the second branch 122, an inlet thereof is used for receiving a part of the refrigerant flowing out of the condenser 120, a first outlet thereof is connected to the evaporator 140, and a second outlet thereof is connected to the air supplement port of the compressor 110.
The heat radiating plate 210 is disposed at a high temperature region of the electric control board of the compressor, and the pipe 123 of the first outlet of the gas-liquid separator 170 leading to the evaporator 140 is configured to flow through the heat radiating plate 210 to take away part of the heat radiating plate 210 with the refrigerant flowing therein.
In the refrigeration system of the inverter air conditioner of the embodiment, the outlet of the first throttling device 130 forms a first branch 121 and a second branch 122. The gas-liquid separator 170 is disposed on the second branch 122, and has an inlet for receiving a portion of the refrigerant flowing out of the condenser 120 and a first outlet connected to the evaporator 140. The heat dissipation plate 210 is disposed at a high temperature region of the electric control plate of the compressor 110, and a pipeline of the first outlet of the gas-liquid separator 170 leading to the evaporator 140 is configured to flow through the heat dissipation plate 210 to take away part of heat of the heat dissipation plate 210 by using a refrigerant flowing therein, thereby avoiding problems of low heat dissipation efficiency and complex structure by simply relying on air convection. And the cost of the heat sink device is reduced due to the reduced size of the heat sink.
The refrigerating system of the inverter air conditioner of this embodiment is provided with an air supplement branch 124, one end of which is connected to the second outlet of the gas-liquid separator 170, and the other end of which is connected to the air supplement port of the compressor 110, so as to introduce the gaseous refrigerant in the gas-liquid separator 170 into the compressor 110, thereby improving the energy efficiency of the system and improving the temperature regulation effect of the air conditioner. In this embodiment, a gas supply flow control device 163 is further added, and the gas supply flow control device 163 is disposed on the gas supply branch 124 and is used for controlling the flow of the refrigerant in the gas supply branch 124.
When the refrigeration system of the inverter air conditioner enters the air supply working condition, the first throttling device 130 is configured to throttle the refrigerant flowing out of the condenser 120, and the gas-liquid separator 170 is configured to open the second outlet, so that the gaseous refrigerant separated from the gas-liquid separator 170 enters the compressor 110 through the air supply branch 124, and therefore the compressor 110 is supplied with air, the system energy efficiency is further improved, and the temperature regulation effect of the air conditioner is improved.
When the refrigeration system of the inverter air conditioner exits the air supply working condition, the first throttling device 130 is configured to be fully opened, and the gas-liquid separator 170 is configured to close the second outlet, so that the refrigerant flowing out of the condenser 120 enters the second branch 122, and enters the first outlet of the gas-liquid separator 170 after filling the gas-liquid separator 170 and leads to the pipeline 123 of the evaporator, thereby improving the heat dissipation efficiency of the heat dissipation plate 210.
In this embodiment, a second throttling device 161 and a third throttling device 162 are further added. The second throttling device 161 is disposed on the first branch passage 121 and is used for throttling the refrigerant in the first branch passage 121. The third throttling device 162 is provided in the line 123 of the first outlet of the gas-liquid separator 170 leading to the evaporator 140, and is configured to throttle the refrigerant in the line 123.
In the refrigeration system of the inverter air conditioner, a flow dividing device can be arranged at the downstream of the condenser 120, a first flow dividing port of the flow dividing device is connected with the first branch 121, and a second flow dividing port of the flow dividing device is connected with the second branch 122, so that the flow of the refrigerant of the first branch 121 and the flow of the refrigerant of the second branch 122 can be controlled through the flow dividing device, and the heat dissipation function can be controlled.
In the split type inverter air conditioner, the compressor 110, the electric control board thereof, the heat radiating plate 210, and the condenser 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. 2 is a schematic diagram of an electronic control box 220 in a refrigeration system of an inverter air conditioner according to one embodiment of the invention, and fig. 3 is a schematic diagram of an electronic control board 230 in the refrigeration system of the inverter air conditioner according to one embodiment of the invention; FIG. 4 is a schematic view of a heat dissipating plate 210 in a refrigerating system of an inverter air conditioner according to an embodiment of the present invention; fig. 5 is an exploded view of a heat radiating plate 210 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 pipe 123 enters the electrical control box 220 from the side of the electrical control box 220 opposite to the area where the condenser 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 heat radiation plate is provided with a pipe chase, and the extending configuration of the pipe 123 leading to the evaporator 140 from the first outlet of the gas-liquid separator 170 is adapted to the arrangement shape of the pipe chase. 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. 2-5, 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 pipe 123 is inserted into the pipe channel and forms a U-shaped connecting section 125 on the other side in the direction of opening.
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 212 is disposed on the second side of the first plate 211, and a second groove 214 corresponding to the first groove 213 is disposed on a surface of the second plate 211 opposite to the first plate 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 plate surfaces of the first plate 211 and the second plate 212 are respectively formed with grooves 213 and 214, and after the first plate 211 and the second plate 212 are fastened, the opposite grooves 213 and 214 jointly define a pipe groove.
The cross-sectional shape of the tube groove may be adapted to the shape of the pipeline 123, and may be, for example, circular, oval, square, rectangular, or the like. In order to improve the heat transfer efficiency, in the present embodiment, it is preferable to use a circular pipe 123 and a circular-interface pipe groove. In order to ensure higher heat exchange efficiency, heat-conducting media such as heat-conducting silica gel can be coated between the pipeline 123 and the inner wall of the pipe groove.
The area of contact of chase and pipeline 123 is first area of contact, and the area of contact of automatically controlled board 230 and heating panel 210 is the second contact surface, and first area of contact is 1 to 6 times of second area of contact, ensures that the effective heat radiating area of heat dissipation pipeline is reasonable value, avoids automatically controlled board 230 overcooling and undercooling, saves the consumptive material when guaranteeing automatically controlled board 230 radiating effect.
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 aluminum, thereby improving 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. 6 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention. Fig. 6 omits the first throttling device, the second throttling device and the air make-up flow regulating device.
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 units 30 are connected to each other through a refrigeration duct and an electric circuit. The refrigerant pipe is used to connect a refrigerant unit of the indoor unit 30 and a refrigerant unit of the outdoor unit 20 to form 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 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 have various structures such as a wall-mounted type, a vertical type, a ceiling type, and the like, and the indoor fan is configured to promote formation of an air flow flowing through the evaporator 140 to adjust the temperature of the indoor environment. The air speed of the indoor fan is matched with the temperature of the evaporator 140, so that the indoor environment can meet the temperature regulation requirement.
Fig. 7 is a schematic view of an inverter air conditioner according to an embodiment of the present invention. The outdoor unit includes a casing 201, a condenser 120 (or referred to as an outdoor heat exchanger), an outdoor fan 202, a compressor 110, a first throttling device 130, and the like. The indoor unit includes a casing 203, an evaporator 140, an indoor fan 204, and the like. 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 energy capacity 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 120 serves to cool the refrigerant discharged from the compressor 110. The outdoor fan 202 generates a heat radiation airflow for radiating heat to the condenser 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 120. The outdoor fan 202 draws ambient airflow through the condenser 120 to dissipate heat.
The electronic 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 120 is directed to heat sink 210 on electronic control board 230 to carry away at least some of the heat.
When the refrigeration system is in the air-make-up working condition, the refrigerant supplied from the compressor 110 is cooled by the condenser 120, throttled by the first throttling device 130, and then split into the first branch 121 and the second branch 122 by the splitting device. The refrigerant in the first branch path 121 is throttled by the second throttle device 161 and enters the evaporator 140. The refrigerant in the second branch 122 enters the gas-liquid separator 170, and at this time, the gas portion of the refrigerant enters the gas supplementing branch 124 through the second outlet, and the liquid portion enters the pipeline 123 through the first outlet. The refrigerant in the air supply branch 124 is throttled by the air supply flow control device 163 and then enters the compressor 110 through the air supply port of the compressor 110. The refrigerant in the pipe 123 exchanges heat with the heat dissipation plate 210, and then enters the evaporator 140 after being throttled by the third throttling device 162. The refrigerant in the evaporator 140 enters the compressor 110 after exchanging heat.
When the refrigeration system exits the air supply operation mode, the refrigerant supplied from the compressor 110 is radiated by the condenser 120, and then flows through the first throttling device 130, the first throttling device 130 is fully opened, and then is shunted into the first branch 121 and the second branch 122 by the shunting device. The refrigerant in the first branch path 121 is throttled by the second throttle device 161 and enters the evaporator 140. The refrigerant in the second branch 122 first enters the gas-liquid separator 170, and enters the pipeline 123 from the first outlet after the gas-liquid separator 170 is filled. The refrigerant in the pipe 123 exchanges heat with the heat dissipation plate 210, and then enters the evaporator 140 after being throttled by the third throttling device 162. The refrigerant in the evaporator 140 enters the compressor 110 after exchanging heat.
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 70 ℃ (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 adjusting 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Thus, it should be appreciated by those skilled in the art that while various exemplary embodiments of the invention have been shown and described in detail herein, many other variations or modifications which are consistent with the principles of this invention may be determined or derived directly 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 refrigeration system of an inverter air conditioner, comprising:
a refrigeration main cycle including a compressor, a condenser, a first throttling device, and an evaporator connected in sequence, wherein an outlet of the first throttling device forms a first branch and a second branch, wherein the first branch is connected to the evaporator;
the gas-liquid separator is arranged on the second branch, the inlet of the gas-liquid separator is used for receiving part of the refrigerant flowing out of the condenser, the first outlet of the gas-liquid separator is connected to the evaporator, and the second outlet of the gas-liquid separator is connected to the air supplement port of the compressor;
a heat dissipation plate disposed at a high temperature region of an electric control board of the compressor, and a pipe of the first outlet of the gas-liquid separator leading to the evaporator is configured to flow through the heat dissipation plate to take away part of heat of the heat dissipation plate with refrigerant flowing therein.
2. The refrigeration system of the inverter air conditioner of claim 1, further comprising:
and one end of the gas supplementing branch is connected to the second outlet of the gas-liquid separator, and the other end of the gas supplementing branch is connected to a gas supplementing port of the compressor so as to guide the gaseous refrigerant in the gas-liquid separator into the compressor.
3. The inverter air conditioner refrigeration system according to claim 2, further comprising:
and the air supply flow regulating and controlling device is arranged on the air supply branch and is used for regulating and controlling the flow of the refrigerant in the air supply branch.
4. The refrigeration system of the inverter air conditioner according to claim 2, wherein,
when a refrigerating system of the inverter air conditioner enters an air supplementing working condition, the first throttling device is configured to throttle the refrigerant flowing out of the condenser, and the gas-liquid separator is configured to open the second outlet so as to enable the gaseous refrigerant separated from the gas-liquid separator to enter the compressor through the air supplementing branch.
5. The refrigeration system of the inverter air conditioner according to claim 4, wherein,
when the refrigerating system of the variable-frequency air conditioner exits the air supplementing working condition, the first throttling device is configured to be completely opened, and the gas-liquid separator is configured to close the second outlet, so that the refrigerant flowing out of the condenser enters the second branch, and after the refrigerant is filled in the gas-liquid separator, the refrigerant enters the first outlet of the gas-liquid separator and leads to the pipeline of the evaporator.
6. The inverter air conditioner refrigeration system according to claim 1, further comprising:
the second throttling device is arranged on the first branch and used for throttling the refrigerant in the first branch;
and the third throttling device is arranged on a pipeline leading to the evaporator from the first outlet of the gas-liquid separator and is used for throttling the refrigerant in the pipeline.
7. The refrigeration system of the inverter air conditioner of claim 1, further comprising
The flow dividing device is arranged at the downstream of the first throttling device and used for controlling the flow of the first branch and the second branch;
the first shunt opening of the shunt device is connected with the first branch, and the second shunt opening of the shunt device is connected with the second branch.
8. The inverter air conditioner refrigerating system according to claim 1, wherein
A pipe groove is formed in the heat dissipation plate, and the extending structure of a pipeline leading to the evaporator from the first outlet of the gas-liquid separator is matched with the arrangement shape of the pipe groove;
the contact area of the pipe groove and a pipeline leading to the evaporator from a first outlet of the gas-liquid separator is a first contact area, the contact area of the electric control plate and the heat dissipation plate is a second contact area, and the first contact area is 1-6 times of the second contact area.
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 |
|---|---|---|---|
| CN202110710644.XA CN115523685A (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 |
|---|---|---|---|
| CN202110710644.XA CN115523685A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115523685A true CN115523685A (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110710644.XA Pending CN115523685A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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| Country | Link |
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| CN (1) | CN115523685A (en) |
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