CN115523687A - Variable frequency air conditioner and refrigerating system thereof - Google Patents
Variable frequency air conditioner and refrigerating system thereof Download PDFInfo
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- CN115523687A CN115523687A CN202110710651.XA CN202110710651A CN115523687A CN 115523687 A CN115523687 A CN 115523687A CN 202110710651 A CN202110710651 A CN 202110710651A CN 115523687 A CN115523687 A CN 115523687A
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 115
- 239000003507 refrigerant Substances 0.000 claims abstract description 113
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- 238000005057 refrigeration Methods 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000003570 air Substances 0.000 description 64
- 238000001816 cooling Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
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- 238000007906 compression Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
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- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a variable frequency air conditioner and a refrigerating system thereof. The refrigerating system comprises a refrigerating cycle, a compressor, a condenser, a throttling device and an evaporator, wherein the compressor, the condenser, the throttling device and the evaporator are sequentially connected in series through a refrigerant pipeline; the heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor and is internally provided with a pipe groove; the heat dissipation branch is arranged between the compressor and the evaporator and is connected with part of refrigerant pipelines between the compressor and the evaporator in parallel, and part of the heat dissipation branch is arranged in the pipe groove in a penetrating mode so as to take away heat of part of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation branch. The scheme of the invention utilizes the refrigerant in the heat dissipation shunt circuit to dissipate heat of the electric control board, solves the problems of low heat dissipation efficiency and complex structure, and can reduce the size of the heat dissipation board and the cost of heat dissipation 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 radiating module, and the radiating module generally comprises a temperature equalizing plate and radiating 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 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.
For guaranteeing the cooling effect, the solution of the prior art is to use the radiating fin of bigger specification, and this can cause the cooling module consumptive material volume big, and then leads to the cost to rise by a wide margin, perhaps adopts the main refrigerant flow path of use part to dispel the heat to automatically controlled board, and then leads to the performance that adjusts the temperature to descend.
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:
a refrigeration cycle comprising a compressor, a condenser, a throttling device and an evaporator connected in series in sequence by a refrigerant pipeline;
the heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor and is internally provided with a pipe groove;
and the heat dissipation branch is arranged between the compressor and the evaporator and is connected with part of refrigerant pipelines between the compressor and the evaporator in parallel, and part of the heat dissipation branch is arranged in the pipe groove in a penetrating way so as to take away the heat of part of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation branch.
Further, this inverter air conditioner's refrigerating system still includes:
the flow dividing device is arranged at the downstream of the evaporator;
the first shunt port of the shunt device is connected with the heat dissipation shunt, and the second shunt port of the shunt device is connected with the refrigerant pipeline.
Furthermore, the refrigerant flow of the heat dissipation branch is 5-30% of the total refrigerant quantity of the refrigeration system.
Further, the evaporator includes:
the discharge port is connected with a refrigerant pipeline at the downstream of the flow dividing device; and
and a supply inlet for supplying the refrigerant downstream of the condenser.
Further, the diverging device further comprises:
the liquid accumulator is used for separating residual liquid refrigerants in the refrigerants supplied by the evaporator, an inlet of the liquid accumulator is used for receiving refrigerants subjected to heat exchange with the evaporator, and an exhaust port of the liquid accumulator is connected to the heat dissipation pipeline so as to supply the refrigerants supplied by the exhaust port to the heat dissipation pipeline and the heat exchange section of the heat dissipation plate.
Further, the refrigerating system of the inverter air conditioner also comprises:
and the flow regulating device is arranged on the refrigerant pipeline and is used for regulating and controlling the flow of the refrigerant in the refrigerant pipeline.
Further, the flow regulating device is a capillary tube or a throttling short tube.
Furthermore, the pipe grooves are uniformly arranged in the heat dissipation plate, and the extending structure of the heat dissipation pipeline is matched with the arrangement shape of the pipe grooves;
the contact area of the inner surface of the pipe groove and the radiating branch is a first contact area, the contact area of the electric control plate and the radiating plate is a second contact area, and the ratio of the first contact area to the second contact area is 0.5-5.
Further, 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.
The refrigerating system of the variable frequency air conditioner is characterized in that the heat dissipation plate is arranged at the high-temperature area of the electric control plate of the compressor, and a pipe groove is formed in the heat dissipation plate. The heat dissipation branch is arranged between the compressor and the evaporator and is connected with part of refrigerant pipelines between the compressor and the evaporator in parallel, and part of the heat dissipation branch is arranged in the pipe groove in a penetrating mode to utilize flowing refrigerants to take away heat of part of heat dissipation plates, the problem that the heat dissipation efficiency is low and the structure is complex due to the fact that only air is relied on is avoided, and the cost during heat dissipation is reduced due to the fact that the size of the heat dissipation plate is reduced.
Furthermore, in the refrigeration system of the variable frequency air conditioner, the downstream of the evaporator is provided with the flow dividing device, the first flow dividing port of the flow dividing device is connected with the heat dissipation branch, and the second flow dividing port is connected with part of refrigerant pipelines between the compressor and the evaporator, so that the flow of the refrigerant of the heat dissipation branch can be controlled through the flow dividing device, and the heat dissipation function is controlled.
Furthermore, in the refrigerating system of the variable frequency air conditioner, the ratio of the refrigerant flow of the heat dissipation branch to the total refrigerant quantity of the refrigerating system is 5-30%, so that the heat dissipation function is ensured, the main refrigerant flow path is not influenced, and the integral temperature regulation effect of the air conditioner is ensured.
Furthermore, in the refrigeration system of the inverter air conditioner, the flow regulating device is arranged on a part of refrigerant pipelines between the compressor and the evaporator and used for regulating and controlling the flow of the refrigerant in the part of refrigerant pipelines between the compressor and the evaporator, so that the refrigerant flow ratio of the heat dissipation branch and the part of refrigerant pipelines between the compressor and the evaporator can be more accurately controlled, and the guarantee is provided when the flow dividing device fails.
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 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 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 heat dissipating 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 a variable frequency air conditioner according to an embodiment of the present invention.
Detailed Description
The embodiment provides a refrigerating system of an inverter air conditioner. FIG. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to one embodiment of the present invention. The refrigeration system is implemented using a compression refrigeration cycle. The refrigeration cycle includes a compressor 110, a condenser 120, a throttling device 130, and an evaporator 140 connected in series by a refrigerant line. The compression refrigeration cycle transfers heat by using a compression phase change cycle of the refrigerant in the compressor 110, the condenser 120, the evaporator 140, and the 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.
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 throttling device 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) into vapor, thereby absorbing ambient heat and lowering ambient temperature, thereby 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 to perform the cooling or heating function. Since the refrigerant is reversed to switch between the cooling and heating functions, which is well known to those skilled in the art, it is not 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 for electricity also need to be considered when arranging the electronic control board, which further makes the arrangement of the heat dissipation device on the electronic control board difficult.
In order to solve the above problem, the cooling system of the inverter air conditioner of this embodiment is additionally provided with a heat dissipation plate 210, and the refrigerant in the cooling system is used to realize heat dissipation of the electric control plate. The refrigeration cycle includes a compressor 110, a condenser 120, a throttling device 130, and an evaporator 140 connected in series by a refrigerant line, the condenser 120 is connected to an exhaust port of the compressor 110 for cooling a refrigerant discharged from the compressor 110.
The inverter air conditioner is provided with a heat radiating plate 210. The heat dissipation plate 210 is provided to be disposed at a high temperature region of the electric control board, and is provided with a pipe groove.
The heat dissipation branch 123 in the refrigeration system of the inverter air conditioner is disposed between the compressor 110 and the evaporator 140, and is connected in parallel with a portion of the refrigerant pipeline 122 between the compressor 110 and the evaporator 140, and a portion of the heat dissipation branch 122 is disposed in the pipe groove in a penetrating manner, so as to take away a portion of heat of the heat dissipation plate 210 by using the refrigerant flowing therein.
The throttle device 130 in the refrigeration system of the inverter air conditioner is provided downstream of the condenser 120, and throttles the refrigerant discharged from the condenser 120. The evaporator 140 is connected between the throttling device 130 and the return port of the compressor 110, so that the refrigerant flowing therethrough is evaporated to achieve the refrigeration capacity release. The refrigerant is eventually returned to the compressor through the evaporator 140, completing the entire refrigeration cycle.
In the refrigeration system of the inverter air conditioner of the present invention, the refrigerant pipeline between the throttling device 130 and the evaporator 140 is set as the heat dissipation branch 123 and the part of the refrigerant pipeline 122 between the compressor 110 and the evaporator 140 which are connected in parallel. The heat dissipation plate 210 is arranged in the high-temperature area of the electric control plate 230 of the compressor 110, the heat dissipation plate 210 is provided with a pipe groove, and a part of the heat dissipation branch 123 penetrates through the pipe groove to take away the heat of the part of the heat dissipation plate 210 by utilizing the refrigerant flowing in the heat dissipation branch, so that the problem of low heat dissipation efficiency and complex structure caused by the fact that the heat dissipation efficiency is low due to the fact that air is solely depended on convection is solved, and the cost during heat dissipation is reduced due to the fact that the size of the heat dissipation plate 210 is reduced.
The inverter air conditioner is provided with a flow dividing device 150. A flow diversion device 150 is disposed downstream of the condenser 120. The flow dividing device comprises a first flow dividing port, a second flow dividing port and a refrigerant inflow port. The refrigerant branch port is connected to a refrigerant pipeline located at the downstream of the condenser 120, the first branch port of the branch device 150 is connected to the heat dissipation branch 123, and the second branch port of the branch device 150 is connected to a portion of the refrigerant pipeline 122 between the compressor and the evaporator. The evaporator 140 includes a first inlet, a second inlet, and a discharge outlet. The first inlet is connected to the heat-dissipating branch 123, the second inlet is connected to a part of the refrigerant pipe 122 between the compressor and the evaporator, and the discharge port is connected to the return port of the compressor 110. One end of the heat dissipation branch 123 is connected to the first branch port of the current divider 150, and then passes through the heat dissipation plate 210, and the other end is connected to the first inlet of the evaporator 140. One end of a part of the refrigerant pipeline 122 between the compressor and the evaporator is connected to the second flow dividing port of the flow dividing device 150, and the other end is connected to the second inlet of the evaporator. In some embodiments, the heat dissipation branch 123 and a portion of the refrigerant pipeline 122 between the compressor and the evaporator may converge between the flow dividing device 150 and the evaporator 140, and then directly enter the evaporator 140.
In the refrigeration system of the inverter air conditioner, the downstream of the condenser 120 is provided with the flow dividing device 150, the first flow dividing port of the flow dividing device 150 is connected with the heat dissipation branch 123, and the second flow dividing port is connected with a part of refrigerant pipelines 122 between the compressor and the evaporator, so that the flow of the refrigerant of the heat dissipation branch 123 and the part of refrigerant pipelines 122 between the compressor and the evaporator can be controlled through the flow dividing device 150, and the heat dissipation function is controlled.
The flow dividing device 150 includes an accumulator for separating residual liquid refrigerant in the refrigerant supplied from the evaporator 140, an inlet for receiving the refrigerant that exchanges heat with the evaporator 140, and an outlet connected to the heat dissipation branch 122, so as to supply the refrigerant supplied from the outlet to the heat dissipation branch 122.
In some optional embodiments, the refrigerant flow rate of the heat dissipation branch 123 accounts for 5% to 30% of the total refrigerant amount of the refrigeration system. The flow rate can be obtained by testing the heat dissipation effect of the heat dissipation plate 210 and the temperature adjustment effect of the inverter air conditioner, so that on one hand, the heat of the electric control plate is reliably taken away by the refrigerant, and on the other hand, the influence on the refrigeration function of the refrigeration system is avoided. Through practical tests, the refrigerant flow of the heat dissipation branch 123 accounts for 5% -30% of the total refrigerant quantity of the refrigeration system. 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 condenser 120, and then 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 some embodiments, the inverter air conditioner further includes a flow regulating device 160. The flow rate control device 160 is disposed on a portion of the refrigerant pipeline 122 between the compressor and the evaporator, and is configured to control a flow rate of the refrigerant in the portion of the refrigerant pipeline 122 between the compressor and the evaporator. The flow regulating device 160 may be a capillary tube or a choke spool. In the refrigeration system of the inverter air conditioner, the flow regulating device 160 is arranged on part of the refrigerant pipeline 122 between the compressor and the evaporator and used for regulating and controlling the flow of the refrigerant in part of the refrigerant pipeline 122 between the compressor and the evaporator, so that the refrigerant flow ratio of the heat dissipation branch 123 and part of the refrigerant pipeline 122 between the compressor and the evaporator can be more accurately controlled, and the guarantee is provided when the flow dividing device 150 fails.
In the split type inverter air conditioner, the compressor 110, the electric control board 230 thereof, the heat radiating board 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 electric control box 220 in a refrigeration system of an inverter air conditioner according to an embodiment of the invention, and FIG. 3 is a schematic diagram of an electric control board 230 in the refrigeration system of the inverter air conditioner according to an 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 refrigeration system of an inverter air conditioner according to an embodiment of the present invention.
The electric control box 220 has a rectangular parallelepiped box shape, and is generally disposed on the top of the area where the compressor 110 is located in the outdoor unit. The electronic control board 230 is disposed inside the electronic control box 220. The heat dissipation branch 123 enters the electronic control box 220 from the side of the electronic 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 pipe slots are uniformly arranged in the heat dissipation plate 210, and the extension configuration of the heat dissipation branch 123 is adapted to the arrangement shape of the pipe slots. The contact area of the inner surface of the pipe groove and the heat dissipation branch 123 is a first contact area, the contact area of the electric control board 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 0.5-5, so that the effective heat dissipation area of the first branch heat dissipation branch 123 is a reasonable value, the electric control board 230 is prevented from being excessively cooled and undercooled, the heat dissipation effect of the electric control board 230 is guaranteed, and consumable materials are saved.
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 radiating branches 123 are embedded in the tube slots and form a U-shaped connecting section 124 on the other side in the direction of access.
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 pipe groove may be adapted to the shape of the radiating branch 123, and may be, for example, circular, elliptical, square, or rectangular. In order to improve the heat transfer efficiency, in the present embodiment, it is preferable to use the circular radiating branch 123 and the circular interface tube groove. In order to ensure higher heat exchange efficiency, heat-conducting media such as heat-conducting silica gel can be coated between the heat-radiating shunt 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 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 throttling 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 outdoor unit 20 in a variable frequency 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, and a throttling device 130. The compressor 110 is preferably an inverter compressor driven by an inverter motor. And adjusting the rotating speed of the air conditioner according to the refrigeration requirement. The cooling capability of the air conditioner is increased by increasing the rotation speed of the compressor 110. The compressor 110 is driven by the electronic control board 230 to provide power for refrigerant circulation, and the power supply frequency is adjusted by the electronic control board 230 to adjust the rotating speed. The condenser 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 air through the condenser 120 to dissipate heat.
The electric control panel 230 is used for controlling the operation state of the outdoor unit 20, and includes an inverter device for driving the compressor 110. When the electric control board 230 drives the compressor 110 to operate, the power element generates heat, and the heating value may increase as the cooling load increases and the state change frequency increases. The refrigerant in condenser 120 is directed to heat sink 210 on electronic control board 230 to remove at least some of the heat. The refrigerant returns to the condenser 120, continues to exchange heat with the ambient air flow of the outdoor fan 202, and enters the evaporator 140 through the throttling device after condensation is completed.
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 electronic 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 electronic 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 to imply that the number of indicated technical features is significant. 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 cycle comprising a compressor, a condenser, a throttling device and an evaporator connected in series in sequence by a refrigerant pipeline;
the heat dissipation plate is arranged at a high-temperature area of an electric control plate of the compressor, and a pipe groove is formed in the heat dissipation plate;
and the heat dissipation branch is arranged between the compressor and the evaporator and is connected with part of refrigerant pipelines between the compressor and the evaporator in parallel, and part of the heat dissipation branch is arranged in the pipe groove in a penetrating manner so as to take away part of heat of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation branch.
2. The inverter air conditioner refrigerating system according to claim 1, wherein
The flow dividing device is arranged at the downstream of the evaporator;
and a first shunt port of the shunt device is connected with the heat dissipation shunt, and a second shunt port of the shunt device is connected with the partial refrigerant pipeline.
3. The inverter air conditioner refrigerating system according to claim 2, wherein
The refrigerant flow of the heat dissipation branch is 5-30% of the total refrigerant quantity of the refrigeration system.
4. The inverter air conditioner refrigeration system according to claim 2, the evaporator comprising:
the discharge port is connected with a refrigerant pipeline at the upstream of the flow dividing device; and
and a supply inlet for supplying the refrigerant downstream of the condenser.
5. The refrigeration system of the inverter air conditioner of claim 4, wherein the flow dividing device comprises:
the liquid storage device is used for separating residual liquid refrigerants in refrigerants supplied by the evaporator, an inlet of the liquid storage device is used for receiving refrigerants subjected to heat exchange with the evaporator, and an exhaust port of the liquid storage device is connected to the heat dissipation branch circuit so as to supply the refrigerants supplied by the exhaust port to the heat dissipation branch circuit.
6. The inverter air conditioner refrigeration system according to claim 1, further comprising:
and the flow regulating and controlling device is arranged on the refrigerant pipeline and is used for regulating and controlling the flow of the refrigerant in the refrigerant pipeline.
7. The refrigerating system of the inverter air conditioner of claim 6, wherein
The flow regulating device is a capillary tube or a short throttling pipe.
8. The inverter air conditioner refrigerating system according to claim 1, wherein
The pipe grooves are uniformly arranged in the heat dissipation plate, and the extending structure of the heat dissipation branch is matched with the arrangement shape of the pipe grooves;
the contact area of the inner surface of the pipe groove and the heat dissipation 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 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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| CN202110710651.XA CN115523687A (en) | 2021-06-25 | 2021-06-25 | Variable frequency air conditioner and refrigerating system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117082845A (en) * | 2023-10-17 | 2023-11-17 | 湖南省康普通信技术有限责任公司 | Modularized data center heat dissipation cold channel device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117082845A (en) * | 2023-10-17 | 2023-11-17 | 湖南省康普通信技术有限责任公司 | Modularized data center heat dissipation cold channel device |
| CN117082845B (en) * | 2023-10-17 | 2024-01-30 | 湖南省康普通信技术有限责任公司 | Modularized data center heat dissipation cold channel device |
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