CN115523694A - Variable frequency air conditioner and refrigerating system thereof - Google Patents
Variable frequency air conditioner and refrigerating system thereof Download PDFInfo
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- CN115523694A CN115523694A CN202110712348.3A CN202110712348A CN115523694A CN 115523694 A CN115523694 A CN 115523694A CN 202110712348 A CN202110712348 A CN 202110712348A CN 115523694 A CN115523694 A CN 115523694A
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- 238000011144 upstream manufacturing Methods 0.000 claims description 4
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a variable frequency air conditioner and a refrigerating system thereof. The refrigeration system comprises a refrigeration main cycle, a compressor, an outdoor unit heat exchange assembly, a first throttling device and an indoor unit heat exchange assembly, wherein the compressor, the outdoor unit heat exchange assembly, the first throttling device and the indoor unit heat exchange assembly are sequentially connected; the air supplementing branch is connected between the first throttling device and an air supplementing port of the compressor and used for guiding part of gaseous refrigerant in the refrigeration main cycle to the air supplementing port of the compressor for supplementing air; the heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor, and the air supply branch is configured to flow through the heat dissipation plate so as to take away heat of part of the heat dissipation plate by utilizing refrigerant flowing in the air supply branch; the flow control device is arranged on the air supply branch and used for controlling the flow of the refrigerant in the air supply branch. The scheme of the invention utilizes the refrigerant of the condenser to radiate the heat of 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 heat generation amount of the IPM accounts for about 60% of the total heat generation amount, and the heat flow density thereof 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; 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 equalizing plates in a heat conduction mode, and the heat dissipation fins then 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 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 the electric control devices such as IPM and the like is easy to deteriorate, and the compressor can only reduce the operating 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 main circulation comprises a compressor, an outdoor unit heat exchange assembly, a first throttling device and an indoor unit heat exchange assembly which are sequentially connected;
the air supplementing branch is connected between the first throttling device and an air supplementing port of the compressor and used for guiding part of gaseous refrigerant in the refrigeration main cycle to the air supplementing port of the compressor for supplementing air;
the heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor, and the air supply branch is configured to flow through the heat dissipation plate so as to take away heat of part of the heat dissipation plate by utilizing refrigerant flowing in the heat dissipation plate;
and the flow control device is arranged on the air supply branch and is used for controlling the flow of the refrigerant in the air supply branch.
Optionally, the refrigeration system of the inverter air conditioner further includes: and the inflow port of the four-way valve is connected with the refrigerant discharge port of the compressor, the second refrigerant port of the four-way valve is connected with the heat exchange assembly of the indoor unit, the third refrigerant port of the four-way valve is connected with the heat exchange assembly of the outdoor unit, and the fourth refrigerant port of the four-way valve is connected with the refrigerant reflux port of the compressor and used for controlling the refrigerant flow direction of the refrigeration main cycle.
Optionally, the refrigeration system of the inverter air conditioner further includes: and the second throttling device is connected between the heat exchange assembly of the indoor unit and the inflow port of the air supplementing branch and is used for throttling the refrigeration main circulation.
Optionally, when a refrigeration system of the inverter air conditioner enters a refrigeration condition, the four-way valve is configured to have a flow inlet communicated with the third refrigerant port, the second refrigerant port is communicated with the fourth refrigerant port, refrigerant supplied by the compressor enters the four-way valve from the flow inlet, flows out of the third refrigerant port and enters the outdoor unit heat exchange assembly for heat exchange, after being throttled by the first throttling device, part of the refrigerant enters the air supplementing branch, and after being throttled by the second throttling device, the rest of the refrigerant enters the indoor unit heat exchange assembly, flows into the four-way valve from the second refrigerant port after heat exchange is completed, and then flows out of the fourth refrigerant port and flows back to the compressor.
Optionally, when a refrigeration system of the inverter air conditioner enters a heating working condition, the four-way valve is configured to have a flow inlet communicated with the second refrigerant port, the third refrigerant port is communicated with the fourth refrigerant port, a refrigerant supplied by the compressor enters the four-way valve from the flow inlet, flows out of the second refrigerant port and enters the indoor unit heat exchange assembly for heat exchange, after being throttled by the second throttling device, part of the refrigerant enters the air supplementing branch, and after being throttled by the first throttling device, the rest of the refrigerant enters the outdoor unit heat exchange assembly, flows into the four-way valve from the third refrigerant port after heat exchange is completed, and then flows out of the fourth refrigerant port and flows back into the compressor.
Optionally, the flow control device controls the flow of the air supply branch to ensure that the temperature of the refrigerant in the refrigerant pipeline upstream of the heat dissipation plate is lower than that in the refrigerant pipeline downstream of the heat dissipation plate.
Optionally, the heat dissipation plate includes: the pipe groove is uniformly arranged in the heat dissipation plate, and the extending structure of the air supply branch is matched with the arrangement shape of the pipe groove.
Optionally, a contact area between the inner surface of the tube slot and the air supply branch is a first contact area, a contact area between the electric control plate and the heat dissipation plate is a second contact area, and a ratio of the first contact area to the second contact area is 0.5 to 5 times.
Optionally, the heat dissipation plate further 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.
The refrigerating system of the variable frequency air conditioner is also provided with an air supplementing branch besides the main refrigerating cycle. The air supplementing branch is connected between the first throttling device and the air supplementing port of the compressor and used for guiding part of gaseous refrigerants in the refrigeration main cycle to the air supplementing port of the compressor for supplementing air. And the air supply branch flows through the heat dissipation plate arranged in the high-temperature area of the electric control plate of the compressor so as to take away part of heat of the heat dissipation plate by utilizing the refrigerant flowing in the air supply branch, thereby avoiding the problems of low heat dissipation efficiency and complex structure caused by only depending on air convection. 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 requirements of electric control devices such as IPM and the like in a high-temperature operation state can be met.
Furthermore, the refrigerating system of the inverter air conditioner of the invention is provided with the flow control device on the air supply branch, and the flow control device controls the flow of the air supply branch to ensure that the temperature of the refrigerant in the refrigerant pipeline at the upstream of the heat dissipation plate is lower than that of the refrigerant in the refrigerant pipeline at the downstream of the heat dissipation plate, so as to ensure that the refrigerants participating in air supply of the compressor are all gaseous, and ensure the stable operation of the compressor.
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 one embodiment of the invention;
FIG. 4 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. 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 outdoor unit in 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 implements heat transfer by using a compression phase change cycle of a refrigerant in the compressor 110, the outdoor heat exchange assembly 120, the indoor and heat exchange assembly 140, and the first throttling device 130.
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.
In the cooling condition, the outdoor heat exchange assembly 120 is a condenser assembly, and takes away heat of the high-temperature and high-pressure refrigerant vapor from the compressor 110 by using an environmental cooling refrigerant, so that the high-temperature and high-pressure refrigerant vapor is cooled and condensed into a refrigerant liquid with high pressure and normal temperature.
The refrigerant liquid with 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 indoor unit heat exchange 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 indoor heat exchange assembly 140 is an evaporator assembly, in which 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, an evaporator assembly is typically disposed in an indoor environment for exchanging heat with indoor air to achieve indoor cooling. The condenser assembly is disposed in an outdoor environment for exchanging heat 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 alternately change the functions of the indoor heat exchange assembly 140 and the outdoor heat exchange assembly 120, so as to implement a 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 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 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 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 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. 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.
The refrigerating system of the inverter air conditioner of the present embodiment includes a main refrigeration cycle and a supplementary air branch 123. The main refrigeration cycle includes a compressor 110, an outdoor heat exchange assembly 120, a first throttling device 130, and an indoor heat exchange assembly 140, which are connected in sequence. The air supply branch 123 is connected between the first throttling device 130 and the air supply port of the compressor 110, and is used for guiding part of the gaseous refrigerant in the refrigeration main cycle to the air supply port of the compressor 110 for air supply.
The heat dissipating plate 210 is disposed at a high temperature region of the electric control plate of the compressor 110, and the air supply branch 123 is configured to flow through the heat dissipating plate 210 to take away part of heat of the heat dissipating plate 210 by using the refrigerant flowing therein, thereby avoiding the problems of low heat dissipating efficiency and complex structure caused 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 plate 210. The temperature of the refrigerant flowing through the air supply branch 123 is higher than that of the surrounding environment, and the temperature of the heat dissipation plate 210 is taken away by the refrigerant, so that the problem of condensation caused by the fact that the temperature of the heat dissipation plate 210 is lower than that of the surrounding environment can be avoided, and the electrical safety performance is improved.
The refrigeration system of the inverter air conditioner of the embodiment further comprises a flow control device 132. The flow control device 132 is disposed on the gas supplementing branch 123 and is used for controlling the flow of the refrigerant in the gas supplementing branch 123. The flow control device 132 controls the flow of the air supply branch 123 to ensure that the temperature of the refrigerant in the refrigerant pipeline upstream of the heat dissipation plate 210 is lower than that of the refrigerant in the refrigerant pipeline downstream of the heat dissipation plate 210, so as to ensure that the refrigerant which participates in air supply of the compressor 110 is in a gaseous state, and to ensure that the compressor 110 operates stably.
The refrigerating system of the inverter air conditioner of the present embodiment is further provided with a four-way valve 150. The inlet of the compressor is connected to the refrigerant outlet of the compressor 110, the second inlet of the compressor is connected to the indoor heat exchange assembly 140, the third inlet of the compressor is connected to the outdoor heat exchange assembly 120, and the fourth inlet of the compressor is connected to the refrigerant return port of the compressor 110, for controlling the refrigerant flow direction of the main refrigeration cycle.
The refrigerating system of the inverter air conditioner of the present embodiment is further provided with a second throttling device 131. The second throttling device 131 is connected between the indoor unit heat exchange assembly 140 and the inlet of the air make-up branch 123, and is used for throttling the refrigeration main cycle.
When the refrigerating system of the inverter air conditioner enters a refrigerating working condition, the four-way valve 150 is configured to have a flow inlet communicated with the third refrigerant port, the second refrigerant port is communicated with the fourth refrigerant port, the refrigerant supplied by the compressor 110 enters the four-way valve 150 from the flow inlet, flows out from the third refrigerant port and enters the outdoor unit heat exchange assembly 120 for heat exchange, after being throttled by the first throttling device 130, part of the refrigerant enters the air supplementing branch 123, and after being throttled by the second throttling device 131, the rest of the refrigerant enters the indoor unit heat exchange assembly 140, flows into the four-way valve 150 from the second refrigerant port after heat exchange is completed, and then flows out from the fourth refrigerant port and flows back into the compressor 110. The degree of throttling of the first throttling means 130 is smaller than the degree of throttling of the second throttling means 131. In some embodiments, the first throttling device 130 may be in a fully open state or a partially throttled state, and the opening degree of the flow control device 132 is controlled to control the state of the refrigerant entering the compressor through the gas supplementing branch 123.
When the refrigerating system of the inverter air conditioner enters a heating working condition, the four-way valve 150 is configured to have a flow inlet communicated with the second refrigerant port, the third refrigerant port is communicated with the fourth refrigerant port, the refrigerant supplied by the compressor 110 enters the four-way valve 150 from the flow inlet, flows out from the second refrigerant port and enters the indoor unit heat exchange assembly 140 for heat exchange, is throttled by the second throttling device 131, part of the refrigerant enters the air supplementing branch 123, the rest of the refrigerant enters the outdoor unit heat exchange assembly 120 after being throttled by the first throttling device 130, flows into the four-way valve 150 from the third refrigerant port after heat exchange is completed, and then flows out from the fourth refrigerant port and flows back into the compressor 110. The degree of throttling of the first throttling means 130 is greater than the degree of throttling of the second throttling means 131.
In the refrigeration system of the inverter air conditioner of the present invention, a flow dividing device may be disposed downstream of the outdoor heat exchanger 120, a first flow dividing port of the flow dividing device is connected to the air supply branch 123, and a second flow dividing port of the flow dividing device is connected to the refrigeration main cycle, so that the flow rate of the refrigerant of the air supply branch 123 may be controlled by the flow dividing device, thereby controlling the heat dissipation function.
In some alternative embodiments, the ratio of the flow area of the first flow-dividing opening to the flow area of the second flow-dividing opening is between 0.5% and 2%. The flow area can be obtained by testing the heat dissipation effect of the heat dissipation plate 210 and the temperature adjustment effect of the variable frequency air conditioner, so that on one hand, the refrigerant can reliably take away the heat of the electric control plate, and on the other hand, the influence on the refrigeration function of the refrigeration system per se can be avoided. Through practical tests, the ratio of the flow area of the first shunt opening to the flow area of the second shunt opening is 0.5% -2%, and the technical requirements can be met. In the refrigeration system of this embodiment, the high-temperature and high-pressure refrigerant compressed and discharged by the compressor 110 is cooled by the outdoor heat exchanger 120, and then further exchanges heat with the heat dissipation plate 210 to cool and heat the electronic control board (especially, the area where the power device such as the IPM module is located), thereby reducing the temperature thereof.
In the split type inverter air conditioner, the compressor 110, the electric control board thereof, the heat dissipation plate 210, and the outdoor unit heat exchange 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. 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 diagram of a heat sink 210 in a refrigeration 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 air supply branch 123 enters the electric control box 220 from a side of the electric control box 220 opposite to the area where the outdoor unit heat exchange assembly 120 is located, and is finally connected to 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 dissipation plate is provided with pipe slots, the pipe slots are uniformly arranged in the heat dissipation plate 210, and the extending structure of the air supply branch 123 is matched with 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. 4-6, 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 gas supply branch 123 is embedded in the pipe groove and forms a U-shaped connecting section 124 at the other side in the direction of the opening. The contact area of the inner surface of the pipe groove and the air supply branch 123 is a first contact area, the contact area of the electric control plate 230 and the heat dissipation plate 210 is a second contact area, and the ratio of the first contact area to the second contact area is 0.5 to 5 times, so that the effective heat dissipation area of the air supply branch 123 is a reasonable value, the electric control plate 230 is prevented from being excessively cooled and undercooled, the heat dissipation effect of the electric control plate 230 is guaranteed, and meanwhile, consumables are saved.
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 a fastener or by gluing, so as to ensure the 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 slot may also be adapted to the shape of the gas supply branch 123, and may be, for example, circular, oval, square, rectangular, etc. In order to improve the heat transfer efficiency, in this embodiment, a circular gas supply branch 123 and a circular interface tube groove can be preferably used. In order to ensure higher heat exchange efficiency, heat-conducting media such as heat-conducting silica gel can be coated between the air supply branch 123 and the inner wall of the pipe groove.
The heat dissipation plate 210 is formed as a pipe groove by combining plate bodies, so that the heat dissipation plate can be conveniently manufactured and maintained, and is also 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. 6 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention. Fig. 6 omits the first throttle device, the second throttle device, the flow control device, and the four-way valve.
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 indoor unit heat exchange assembly 140 (or referred to as an indoor heat exchanger), an indoor fan (not shown in the figure), and the like, and the indoor unit may be configured to be a wall-mounted type, a vertical type, a ceiling type, or other structures, and the indoor fan is configured to promote the formation of an air flow flowing through the indoor unit heat exchange assembly 140, so as to adjust the temperature of the indoor environment. The air speed of the indoor fan is matched with the temperature of the indoor heat exchange assembly 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, an outdoor unit heat exchange assembly 120 (or referred to as an outdoor heat exchanger), an outdoor fan 202, and a compressor 110. The indoor unit comprises an indoor unit heat exchange assembly 140, an indoor fan 204 and other components. 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 rotation speed. The outdoor heat exchanger assembly 120 cools the refrigerant discharged from the compressor 110. The outdoor fan 202 generates a heat radiation airflow for radiating heat of the outdoor heat exchange assembly 120.
The casing 201 may have a rectangular parallelepiped shape, and the inside thereof is partitioned into a plurality of chambers by partitions, wherein one chamber is used for arranging the compressor 110 and its accessories, and the other chamber is arranged with the outdoor fan 202 to arrange the outdoor heat exchange assembly 120. The outdoor fan 202 draws ambient air through the outdoor heat exchanger 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.
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. 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 refrigeration system of an inverter air conditioner, comprising:
the refrigeration main circulation comprises a compressor, an outdoor unit heat exchange assembly, a first throttling device and an indoor unit heat exchange assembly which are sequentially connected;
the air supplementing branch is connected between the first throttling device and the air supplementing port of the compressor and used for guiding part of gaseous refrigerant in the refrigeration main cycle to the air supplementing port of the compressor for supplementing air;
a heat dissipation plate disposed at a high temperature region of an electric control plate of the compressor, and the gas supply branch is configured to flow through the heat dissipation plate to take away part of heat of the heat dissipation plate by using a refrigerant flowing therein;
and the flow control device is arranged on the air supply branch and is used for controlling the flow of the refrigerant in the air supply branch.
2. The inverter air conditioner refrigeration system according to claim 1, further comprising:
and the inflow port of the four-way valve is connected with the refrigerant discharge port of the compressor, the second refrigerant port of the four-way valve is connected with the heat exchange assembly of the indoor unit, the third refrigerant port of the four-way valve is connected with the heat exchange assembly of the outdoor unit, and the fourth refrigerant port of the four-way valve is connected with the refrigerant backflow port of the compressor and is used for controlling the refrigerant flow direction of the refrigeration main cycle.
3. The inverter air conditioner refrigeration system according to claim 2, further comprising:
and the second throttling device is connected between the heat exchange assembly of the indoor unit and the inflow port of the air supplementing branch and is used for throttling the refrigeration main cycle.
4. The inverter air conditioner refrigeration system of claim 3,
when a refrigerating system of the variable-frequency air conditioner enters a refrigerating working condition, the four-way valve is configured to enable the inflow port to be communicated with the third refrigerant port, the second refrigerant port to be communicated with the fourth refrigerant port, refrigerant supplied by the compressor enters the four-way valve from the inflow port, flows out of the third refrigerant port and enters the outdoor unit heat exchange assembly to exchange heat, after being throttled by the first throttling device, part of the refrigerant enters the air supplementing branch, and after being throttled by the second throttling device, the rest of the refrigerant enters the indoor unit heat exchange assembly, flows into the four-way valve from the second refrigerant port after heat exchange is completed, and then flows out of the fourth refrigerant port and flows back into the compressor.
5. The refrigeration system of the inverter air conditioner according to claim 3, wherein,
when a refrigerating system of the variable-frequency air conditioner enters a heating working condition, the four-way valve is configured to enable the inflow port to be communicated with the second refrigerant port, the third refrigerant port to be communicated with the fourth refrigerant port, refrigerant supplied by the compressor enters the four-way valve from the inflow port, flows out of the second refrigerant port and enters the indoor unit heat exchange assembly for heat exchange, after being throttled by the second throttling device, part of the refrigerant enters the air supplementing branch, and after being throttled by the first throttling device, the rest of the refrigerant enters the outdoor unit heat exchange assembly, flows into the four-way valve from the third refrigerant port after heat exchange is completed, and then flows out of the fourth refrigerant port and flows back into the compressor.
6. The inverter air conditioner refrigerating system according to claim 1, wherein
The flow control device controls the flow of the air supply branch to ensure that the temperature of the refrigerant in the refrigerant pipeline at the upstream of the heat dissipation plate is lower than that of the refrigerant in the refrigerant pipeline at the downstream of the heat dissipation plate.
7. The refrigeration system of the inverter air conditioner of claim 1, wherein the heat radiating plate comprises:
and the pipe grooves are uniformly arranged in the heat dissipation plate, and the extending structures of the air supply branches are matched with the arrangement shapes of the pipe grooves.
8. The inverter air conditioner refrigeration system according to claim 7,
the contact area of the inner surface of the pipe groove and the air supply branch 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 ratio of the first contact area to the second contact area is 0.5-5.
9. The refrigeration system of the inverter air conditioner of claim 8, wherein the heat radiating plate further comprises:
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 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712348.3A CN115523694A (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 |
|---|---|---|---|
| CN202110712348.3A CN115523694A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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| CN115523694A true CN115523694A (en) | 2022-12-27 |
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| CN202110712348.3A Pending CN115523694A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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