CN115523689A - Variable frequency air conditioner and refrigerating system thereof - Google Patents

Abstract

The invention provides an inverter air conditioner and a refrigeration system thereof. The refrigeration system of the inverter air conditioner includes: the compressor is used to provide power for the refrigerant cycle driven by the electric control board; the condenser assembly is connected to the exhaust port of the compressor to cool the refrigerant discharged from the compressor, The condenser assembly includes a first condenser; the gas-liquid separator is arranged downstream of the first condenser, and is used to separate the refrigerant discharged from the first condenser into liquid refrigerant and gaseous refrigerant; the heat dissipation pipe is connected to the gas-liquid separator The liquid outlet of the device is used to introduce liquid refrigerant for the refrigerant to flow; the heat dissipation plate is used to be arranged at the high temperature area of the electric control board, and is provided with a pipe groove matched with the heat dissipation pipe, and at least part of the heat dissipation pipe is passed through the In the pipe groove, the refrigerant flowing in it can take away part of the heat from the radiator plate. The solution of the invention reduces the size of the heat dissipation plate and reduces the cost.

Description

Inverter Air Conditioner and Its Refrigeration System

technical field

The present invention relates to the technical field of air conditioning, in particular, to an inverter air conditioner and its refrigeration system.

Background technique

The high-power electronic control device is installed in the high-power area of the electric control board (or called the frequency conversion board) in the household frequency conversion air conditioner, and its heat dissipation problem is a technical problem that needs to be solved urgently. In particular, the heat generated by IPM (Intelligent Power Module, Intelligent Power Module) in high-power electronic control devices accounts for about 60% of the total heat generated, and its heat flux density is the highest.

The above-mentioned high-power electronic control devices need to install a special heat dissipation module, and the heat dissipation module is generally composed of a vapor chamber and heat dissipation fins. The thermal conductive silicone grease is coated between the high-power device and the vapor chamber, and the combination of the two is realized by fasteners; the other side of the vapor chamber is installed with cooling fins, which transfer heat through convective heat exchange. Emit into the surrounding air.

The traditional heat dissipation method of the electronic control board mainly relies on the convective heat transfer of the ambient airflow of the condenser to the heat dissipation fins to achieve heat dissipation. Since the condenser itself is a high-temperature component, the temperature of the airflow passing through the condenser will also increase significantly, thereby seriously affecting the cooling effect of the electronic control device. Especially in the case of high outdoor ambient temperature, the operating temperature of the electronic control device is very high, and heat dissipation is urgently needed, and the temperature of the condenser also rises under this working condition, and the temperature of the airflow after passing through the condenser will be higher than that of the natural airflow by more than 15°C . At this time, the heat dissipation of electronic control devices such as IPM is likely to deteriorate, and the compressor can only reduce the operating frequency to reduce the heat generated by the electronic control devices, resulting in a significant reduction in the cooling capacity of the whole machine.

In order to ensure the cooling effect, the solution in the prior art is to use larger-sized cooling fins, which will result in a large amount of consumable materials for the cooling module, which in turn will lead to a significant increase in cost.

Contents of the invention

An object of the present invention is to provide an inverter air conditioner and its refrigeration system that improve the heat dissipation efficiency of the electric control board.

A further object of the present invention is to increase the refrigeration effect and refrigeration efficiency.

Another further object of the present invention is to achieve a good cooling effect of the electric control board with a small amount of refrigerant.

According to one aspect of the present invention, a refrigeration system for an inverter air conditioner is provided, including:

The compressor is used to provide power for the refrigerant cycle driven by the electric control board;

a condenser assembly connected to the discharge port of the compressor for cooling the refrigerant discharged from the compressor, wherein the condenser assembly includes a first condenser;

A gas-liquid separator, arranged downstream of the first condenser, is used to separate the refrigerant discharged from the first condenser into liquid refrigerant and gaseous refrigerant;

The heat dissipation pipe is connected to the liquid outlet of the gas-liquid separator to introduce liquid refrigerant for the refrigerant to flow;

The heat dissipation plate is used to be arranged at the high temperature area of the electric control board, and is provided with a pipe groove matched with the heat dissipation pipe, and

At least part of the heat dissipation pipes are passed through the pipe grooves to take away part of the heat from the heat dissipation plate by the refrigerant flowing in the pipe grooves.

Optionally, the refrigerating system of the inverter air conditioner further includes an evaporator assembly, which is connected to the air return port of the compressor, and is used to evaporate the refrigerant flowing through the evaporator assembly;

The heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so that the liquid outlet of the gas-liquid separator communicates with the evaporator assembly; or

The heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so that the liquid outlet of the gas-liquid separator communicates with the compressor.

Optionally, the refrigerating system of the inverter air conditioner further includes a first throttling device, which is connected in series with the heat dissipation pipe, and is used for throttling the refrigerant in the heat dissipation pipe.

Optionally, the first throttling device is connected in series between the liquid outlet of the gas-liquid separator and the cooling plate.

Optionally, the first throttling device is connected in series downstream of the cooling plate.

Optionally, the first throttling device makes the refrigerant flow in the heat dissipation pipe 0.003 to 0.5 times that of the refrigerant in the compressor.

Optionally, the condenser assembly also includes:

The second condenser is connected with the gas outlet of the gas-liquid separator, and is used for cooling the gaseous refrigerant discharged from the gas-liquid separator;

The refrigeration system of the inverter air conditioner also includes:

The second throttling device is connected between the second condenser and the evaporator assembly, and is used for throttling the refrigerant discharged from the second condenser.

Optionally, the pipe grooves are uniformly arranged in the heat dissipation plate, and the extension structure of the condensation connecting pipe is adapted to the arrangement shape of the pipe grooves;

The contact area between the pipe groove and the heat dissipation pipe is the first contact area, the contact area between the electric control board and the heat dissipation plate is the second contact area, and the first contact area is 1 to 6 times the second contact area.

Optionally, the cooling plate includes:

The first plate body, the first side of which is used to cover the high temperature area of the electric control board of the compressor, and the first groove is opened on the second side;

The second plate is arranged on the second side of the first plate, and a second groove corresponding to the first groove is opened on the surface of the plate opposite to the first plate, so that the first groove and the first groove are connected to each other. The second grooves collectively define a tube groove.

According to another aspect of the present invention, an inverter air conditioner is provided, which includes any refrigeration system of the above inverter air conditioner.

In the refrigeration system of the frequency conversion air conditioner of the present invention, a gas-liquid separator is arranged downstream of the first condenser, and the gas-liquid separation gas divides the refrigerant into liquid refrigerant and gaseous refrigerant, and the heat dissipation pipe is connected to the liquid outlet of the gas-liquid separator. The heat dissipation pipe leads into the heat dissipation plate, and uses the refrigerant flowing through to take away part of the heat of the electric control board, avoiding the problems of low heat dissipation efficiency and complex structure solely relying on air convection. And because the size of the heat dissipation plate is reduced, the cost of the heat dissipation device is reduced.

Further, in the refrigerating system of the inverter air conditioner of the present invention, the radiating pipe is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so that the liquid outlet of the gas-liquid separator communicates with the evaporator assembly, if the refrigerant After cooling the electric control board, it is still liquid or a gas-liquid mixture. The liquid or gas-liquid mixed refrigerant is input into the evaporator assembly to further release the cooling capacity to realize air conditioning refrigeration, which can make full use of the liquid or gas-liquid mixed refrigerant. Cooling capacity, save electricity, improve cooling efficiency. Or, the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so that the liquid outlet of the gas-liquid separator communicates with the compressor. Directly passing the gaseous refrigerant into the compressor can speed up the circulation of the refrigerant and improve the refrigeration efficiency. At the same time, it is avoided to pass the gaseous refrigerant with a very limited cooling capacity into the evaporator assembly, which will affect the evaporation of other liquid refrigerants and seriously affect the cooling effect of the evaporator assembly.

Furthermore, the first throttling device is connected in series between the liquid outlet of the gas-liquid separator and the cooling plate. The refrigerant flowing through the radiator plate is throttled refrigerant, the temperature of the refrigerant is relatively low, and the cooling effect on the radiator plate can be achieved by using a small amount of refrigerant.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

2 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

3 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

4 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of an outdoor machine electric control box in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of an electric control board in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of a cooling plate in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

Fig. 8 is an exploded view of a cooling plate in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention;

Fig. 9 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention;

Fig. 10 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention; and

Fig. 11 is a schematic diagram of an outdoor unit in an inverter air conditioner according to an embodiment of the present invention.

detailed description

This embodiment provides a refrigeration system for an inverter air conditioner. Fig. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention. The refrigerating system is implemented by using a compression refrigeration cycle, as shown in Figure 1, the compression refrigeration cycle uses the compression phase change cycle of the refrigerant in the compressor 110, condenser assembly 120, evaporator assembly 140, and throttling device 131 to achieve heat transfer .

The compressor 110, as the power of the refrigeration cycle, is driven by the motor to rotate continuously, extracts the gaseous refrigerant in the evaporator, increases the pressure and temperature of the refrigerant vapor through compression, and creates the heat transfer of the refrigerant vapor to the external environment medium conditions, that is, the compressor 110 compresses the low-temperature and low-pressure refrigerant vapor into a high-temperature and high-pressure state.

The condenser assembly 120 is a heat exchange device, which uses the ambient cooling refrigerant to take away the heat from the high-temperature and high-pressure refrigerant vapor from the compressor 110, so that the high-temperature and high-pressure refrigerant vapor is cooled and condensed into a high-pressure and normal-temperature refrigerant liquid.

The high-pressure and normal-temperature refrigerant liquid passes through the throttling device to obtain low-temperature and low-pressure refrigerant, which is then sent to the evaporator assembly 140 to absorb heat and evaporate. According to the corresponding principle of saturation pressure and saturation temperature, reducing the pressure of the refrigerant liquid can reduce the temperature of the refrigerant liquid.

The evaporator assembly 140 is another heat exchange device, in which the throttling low-temperature and low-pressure refrigerant liquid evaporates (boils) into vapor, absorbs surrounding heat, and lowers the surrounding temperature to achieve the purpose of cooling.

In an air conditioner, the evaporator assembly 140 is generally arranged in an indoor environment, and is used for exchanging heat with indoor air to achieve indoor cooling. The condenser assembly 120 is arranged in the outdoor environment, and is used for exchanging heat with the outdoor space and releasing heat to the outside.

In some embodiments, the refrigeration system can also be provided with a reversing valve to change the flow direction of the refrigerant and alternately change the functions of the evaporator assembly and the condenser assembly to realize cooling or heating functions. Since the switching of the cooling and heating functions is realized by switching the direction of the refrigerant, it is well known to those skilled in the art, and details will not be repeated here. Those skilled in the art can easily add a reversing valve to the refrigeration system provided by this embodiment.

Inverter air conditioners use inverter compressors. The rotation speed of the compressor 110 is adjusted according to the cooling demand. Therefore, by increasing the rotation speed of the compressor 110, the refrigeration capacity of the air conditioner is improved. Inverter air conditioners use frequency conversion technology to improve electrical energy efficiency and reduce temperature fluctuations. Among them, the frequency conversion technology is to change the power supply frequency of the compressor 110 through a series of treatments such as rectification, filtering, and inversion of the AC power of the grid, which generally realizes its function through the electric control board. Since the frequency conversion technology itself is well known to those skilled in the art, details will not be described here.

For split-type air conditioners, the compressor 110 and its electric control board are arranged inside the outdoor unit. The high-power electronic control devices on the electronic control board will generate serious heat during operation. However, the existing convection heat dissipation method cannot realize reliable heat dissipation. Moreover, since the electric control board has strong electricity, it is necessary to consider the safety regulations of electricity use when arranging it, which further makes it difficult to arrange the heat dissipation devices on the electric control board.

In view of the above problems, as shown in FIG. 1 , the refrigeration system of the inverter air conditioner of this embodiment is provided with a cooling plate 210 , and the refrigerant in the refrigeration system is used to realize the heat dissipation of the electric control board. In the refrigerating system, the compressor 110 is used to provide power for refrigerant circulation under the drive of the electric control board, and the power supply frequency is adjusted through the electric control board to realize the adjustment of the rotational speed. The condenser assembly 120 is connected to the discharge port of the compressor 110 for cooling the refrigerant discharged from the compressor 110 , wherein the condenser assembly 120 includes a first condenser 121 . The gas-liquid separator 150 is arranged downstream of the first condenser 121, and is used for separating the refrigerant discharged from the first condenser 121 into liquid refrigerant and gas refrigerant. The cooling pipe 160 is connected to the liquid outlet of the gas-liquid separator 150 to introduce liquid refrigerant for the refrigerant to flow. The heat dissipation plate 210 is used to be arranged at the high temperature area of the electric control board, and is provided with a pipe groove matched with the heat dissipation pipe 160, and at least part of the heat dissipation pipe 160 is passed through the pipe groove, so that the refrigerant flowing in it can take away Part of the heat from the cooling plate 210 is used to dissipate heat. The evaporator assembly 140 is connected to the air return port of the compressor 110 , and the cooling pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator 140 .

In some embodiments, as shown in FIG. 1 , the refrigerating system of the inverter air conditioner further includes a first throttling device 131, which is connected in series with the heat dissipation pipe 160, and is used to cool the heat in the heat dissipation pipe 160. The refrigerant is throttled to fully realize the cooling effect of the refrigerant in the cooling pipe 160 .

The liquid outlet of the gas-liquid separator is connected to the heat dissipation pipe 160, and the heat dissipation pipe 160 leads into the heat dissipation plate 210, and the liquid refrigerant flowing through it takes away part of the heat of the electric control board, avoiding the low efficiency of heat dissipation by relying solely on air convection , problems with complex structures. And because the size of the heat dissipation plate 210 is reduced, the cost of the heat dissipation device is reduced.

In addition, the temperature of the refrigerant in the heat dissipation pipe 160 is higher than the surrounding environment, and the temperature of the heat dissipation plate 210 is taken away by the refrigerant, which can avoid the condensation problem caused by the temperature of the heat dissipation plate 210 being lower than the surrounding environment, and also improves the electrical safety performance.

In addition, a gas-liquid separator 150 is added, and the liquid outlet of the gas-liquid separator is connected to the heat dissipation pipe 160, so as to use liquid refrigerant to cool the heat dissipation plate 210, to ensure sufficient heat dissipation of the heat dissipation plate 210, and to avoid the gaseous state refrigerant from affecting the first heat sink. The throttling effect of the throttling device 131.

In some embodiments, as shown in FIG. 1 , the condenser assembly 120 further includes a second condenser 122, the second condenser 122 is connected to the gas outlet of the gas-liquid separator 150, and the second condenser 122 is used for cooling the gas-liquid The gaseous refrigerant discharged from the separator 150. The refrigeration system of the inverter air conditioner also includes a second throttling device 132 connected between the second condenser 122 and the evaporator assembly 140 for throttling the refrigerant discharged from the second condenser 122 flow. The second condenser 122 is used to further cool the gaseous refrigerant to obtain liquid refrigerant, so as to give full play to the cooling effect of the refrigerant in the evaporator assembly 140 and ensure the cooling effect of the entire refrigeration system. It also prevents the gaseous refrigerant from affecting the throttling effect of the second throttling device 132 .

In some embodiments, the first throttling device 131 makes the flow rate of the refrigerant in the cooling pipe 160 0.003 to 0.5 times the flow rate of the refrigerant in the compressor 110 . The first throttling device 131 makes the flow rate of the refrigerant in the cooling pipe 160 account for a multiple of the flow rate of the refrigerant in the compressor 110 controllable, and this setting can meet the needs of different working conditions. For example, if the electric control box 230 reaches a lower refrigeration temperature or the refrigerant in the heat dissipation pipe 160 is not completely vaporized, the flow rate of the refrigerant in the heat dissipation pipe 160 may be appropriately increased. If the electric control box 230 reaches a higher cooling temperature or the refrigerant in the heat dissipation pipe 160 is completely vaporized, the flow rate of the refrigerant in the heat dissipation pipe 160 can be appropriately reduced. The specific way for the first throttling device 131 to adjust the flow rate of the refrigerant in the heat dissipation pipe is not limited, for example, it may be an electronic expansion valve, a mechanical method, a series of capillary tubes with different inner diameters, and the like.

Fig. 1 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention; Fig. 2 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention; Fig. 3 is a schematic diagram of an inverter air conditioner according to an embodiment of the present invention 4 is a schematic diagram of a refrigeration system of an inverter air conditioner according to an embodiment of the present invention. Based on the above embodiments, the refrigeration system of the inverter air conditioner further includes an evaporator assembly 140 connected to the air return port of the compressor 110 for evaporating the refrigerant flowing through the evaporator assembly 140 . As shown in FIGS. 1 and 3 , the cooling pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator assembly 140 so that the liquid outlet of the gas-liquid separator 150 communicates with the evaporator assembly 140 . Optionally, as shown in FIGS. 2 and 4 , the cooling pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the compressor 110 so that the liquid outlet of the gas-liquid separator 150 communicates with the compressor 110 .

The cooling pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the evaporator assembly 140 so that the liquid outlet of the gas-liquid separator 150 communicates with the evaporator assembly 140, which can improve the cooling efficiency of the refrigeration system. Specifically, if the refrigerant is still in a liquid state or a gas-liquid mixture after cooling the electric control board 230 according to specific working conditions, the liquid or gas-liquid mixture refrigerant is input into the evaporator assembly 140 to further release the cooling capacity to realize air-conditioning refrigeration. , can make full use of the cooling capacity of liquid or gas-liquid mixed refrigerant, save electric energy and improve cooling efficiency.

In addition, the cooling pipe 160 is connected between the liquid outlet of the gas-liquid separator 150 and the compressor 110 so that the liquid outlet of the gas-liquid separator 150 communicates with the compressor 110, which can improve the cooling efficiency and cooling effect. Specifically, if the refrigerant is in a gaseous state in the heat dissipation pipe 160 after cooling the electric control board 230 , then the gaseous refrigerant is passed into the compressor. Directly passing the gaseous refrigerant into the compressor 110 can speed up the circulation of the refrigerant and improve the refrigeration efficiency. At the same time, it is avoided to pass the gaseous refrigerant with limited cooling capacity into the evaporator assembly 140 , which will affect the evaporation of other liquid refrigerants and seriously affect the cooling effect of the evaporator assembly 140 . To sum up, the above embodiments provide different options under different working conditions, so as to improve the refrigeration capacity and refrigeration efficiency of the refrigeration system.

In some embodiments, the refrigerating system of the inverter air conditioner further includes a first throttling device 131, which is serially connected to the heat dissipation pipe 160, and is used for throttling the refrigerant in the heat dissipation pipe 160, so as to The cooling effect of the refrigerant in the heat dissipation pipe 160 is fully realized. Specifically, as shown in FIG. 3 and FIG. 4 , the first throttling device 131 is serially connected downstream of the cooling plate 210 . Optionally, as shown in FIGS. 1 and 2 , the first throttling device 131 is connected in series between the liquid outlet of the gas-liquid separator 150 and the cooling plate 210 .

The first throttling device 131 is connected in series between the liquid outlet of the gas-liquid separator 150 and the heat dissipation plate 210 so that the refrigerant flowing through the heat dissipation plate 210 is the refrigerant after throttling, and the temperature of the refrigerant is relatively low. A small amount of refrigerant can achieve the cooling effect on the cooling plate 210 . In this embodiment, the arrangement of the first throttling device 131 can cool the electric control box 230 to a lower temperature, which may be lower than the temperature of the electric control box 230 after the ambient air flow or liquid refrigerant dissipates heat. Prevent the rapid deterioration of the electric control box 230 in a high temperature environment.

The first throttling device 131 is serially connected to the downstream of the heat dissipation plate 210, so that the refrigerant in the heat dissipation pipe 160 evaporates in the evaporator assembly 140, fully utilizes the refrigeration capacity of the refrigerant, and improves the cooling effect of the entire refrigeration system.

In the split-type inverter air conditioner, the compressor 110 and its electric control board, heat sink 210, and condenser assembly 120 are all arranged on the outdoor unit. Generally speaking, the electric control board is generally arranged in an electric control box, and the electric control box is arranged above the compressor 110 as a whole. Fig. 5 is a schematic diagram of an electric control box in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention, and Fig. 6 is a schematic diagram of an electric control board in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention; Fig. 7 is a schematic diagram according to A schematic diagram of a heat dissipation plate in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention; FIG. 8 is an exploded view of a heat dissipation plate in a refrigeration system of an inverter air conditioner according to an embodiment of the present invention.

The electric control box 220 is in the shape of a cuboid box as a whole, and is generally arranged on the top of the area where the compressor 110 is located in the outdoor unit. The electric control board 230 is arranged inside the electric control box 220 . The heat dissipation pipe 160 enters the electric control box 220 from the side of the electric control box 220 opposite to the area where the condenser assembly 120 is located, and finally connects to the heat dissipation plate 210 . The high-power electric control devices on the electric control board 230 are generally arranged in a centralized manner. The arrangement position and coverage area of the heat dissipation plate 210 are set according to the arrangement state of the high-power electronic control devices on the electric control board 230 .

The pipe grooves are evenly arranged in the heat dissipation plate 210, and the extension structure of the heat dissipation pipe 160 is adapted to the arrangement shape of the pipe grooves. The distribution of the tube slots can be configured according to the size and structure of the heat sink 210 . For example, for the cooling plate 210 whose length direction is obviously larger than the width direction shown in FIGS. 5-8 , there may be multiple pipe grooves parallel to the length direction. The heat dissipation pipe 160 is embedded in the pipe groove, and forms a U-shaped connecting section 124 on the other side of the access direction.

The contact area between the pipe groove and the heat dissipation pipe 160 is the first contact area, the contact area between the electric control board 230 and the heat dissipation plate 210 is the second contact area, and the first contact area is 1 to 6 times the second contact area.

Ensure that the effective heat dissipation area of the heat dissipation pipe is a reasonable value, avoid overcooling and undercooling of the electric control board 230, and save consumables while ensuring the heat dissipation effect of the electric control board 230.

The cooling plate 210 may include: a first plate body 211 and a second plate body 212 . The first side of the first plate body 211 is used to cover the high temperature area of the electric control board 230 of the compressor 110 , and the first groove 213 is opened on the second side thereof. In some embodiments, the first board body 211 can be attached to the heat generating device of the electric control board 230 by means of fasteners or glue.

The second plate body 212 is arranged on the second side of the first plate body 211, and a second groove 214 corresponding to the first groove 213 is opened on its surface opposite to the first plate body 211, so that the second plate body 212 A groove 213 and a second groove 214 jointly define a pipe groove. The first plate body 211 and the second plate body 212 can be connected by fasteners or adhesive means to ensure reliable combination of the two for smooth heat transfer. That is to say, grooves 213 and 214 are respectively formed on the opposing board surfaces of the first board body 211 and the second board body 212. After the first board body 211 and the second board body 212 are fastened together, the opposite grooves 213, 214 214 collectively define a pipe slot.

The cross-sectional shape of the pipe groove can also be adapted to the shape of the heat dissipation pipe 160 , for example, it can be set as a circle, an ellipse, a square, a rectangle, and the like. In order to improve the heat transfer efficiency, in this embodiment, a circular heat dissipation pipe 160 and a pipe groove with a circular interface may be preferably used. In order to ensure a higher heat exchange efficiency, a heat-conducting medium such as heat-conducting silica gel may be coated between the heat-dissipating pipe 160 and the inner wall of the pipe groove.

The cooling plate 210 is combined with plate bodies to form pipe grooves, which is convenient for preparation and maintenance, and is also convenient for connection with the frequency conversion board. The heat dissipation plate 210 can be made of aluminum to improve heat dissipation efficiency.

This embodiment also provides an inverter air conditioner. The inverter air conditioner has the refrigeration system of the inverter air conditioner in any one of the above embodiments. Fig. 9 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention, and Fig. 10 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention. Figures 9 and 10 omit 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 unit 30 are connected to each other through cooling pipes and electrical lines. The refrigerating pipeline is used to connect the refrigerating components in the indoor unit 30 and the refrigerating components in the outdoor unit 20 to form a refrigerant circulation loop. The heat exchange between indoor and outdoor is realized through the circulating flow of refrigerant.

The indoor unit 30 includes an evaporator assembly 140 (or called an indoor heat exchanger), an indoor fan (not shown in the figure), etc., which can be set in various structures such as wall-mounted, vertical, and ceiling machines. In order to promote the formation of air flow through the evaporator assembly 140, the indoor environment is tempered. The wind speed of the indoor fan is matched with the temperature of the evaporator assembly 140, so that the indoor environment can better meet the temperature regulation requirements.

Fig. 11 is a schematic diagram of an outdoor unit in an inverter air conditioner according to an embodiment of the present invention. The outdoor unit includes a chassis 201, a condenser assembly 120 (or called an outdoor heat exchanger), an outdoor fan 202, a compressor 110, a throttling device and other components. The compressor 110 is preferably a variable frequency compressor driven by a variable frequency motor. According to cooling demand, adjust its speed. The refrigerating energy capacity of the air conditioner is improved by increasing the rotation speed of the compressor 110 . The compressor 110 is used to provide power for the refrigerant cycle driven by the electric control board 230 , and adjust the power supply frequency through the electric control board 230 to realize the adjustment of the rotational speed. The condenser assembly 120 is used to cool the refrigerant discharged from the compressor 110 . The outdoor fan 202 generates a cooling airflow for cooling the condenser assembly 120 .

The casing 201 may be in the shape of a cuboid, and its interior is divided into multiple chambers by partitions, one of which is used for arranging the compressor 110 and its accessories, and the other chamber is used for arranging the outdoor fan 202 and the condenser assembly 120 . The outdoor fan 202 draws ambient air to pass through the condenser assembly 120 to dissipate heat.

The electric control board 230 is used to control the running state of the outdoor unit 20 , including a frequency conversion device for driving the compressor 110 . When the electric control board 230 drives the compressor 110 to run, its power components generate heat. As the cooling load increases and the frequency of state changes increases, the heat generation may increase. The refrigerant in the condenser assembly 120 is introduced into the heat dissipation plate 210 on the electric control board 230 to take away at least part of the heat. The refrigerant returns to the condenser assembly 120 , continues to exchange heat with the ambient airflow of the outdoor fan 202 , and enters the evaporator assembly 140 through the throttling device after completion of condensation.

As shown in FIG. 1 , the gas-liquid separator 150 divides the refrigerant flowing out of the first condenser 121 into two paths, one of which supplies pure liquid refrigerant from the gas-liquid separator 150 to the first throttling device 131 ; After passing through the first throttling device 131 , it enters the cooling plate 210 and then enters the evaporator 140 . The refrigerant in the other path is supplied from the gas-liquid separator 150 to the second condenser 122, and the second condenser 122 further cools the gaseous refrigerant into a liquid refrigerant, and flows the liquid refrigerant to the second throttling device 132, throttling The refrigerant after flowing is passed into the evaporator 140 . The gas-liquid separator 150 divides the refrigerant into gaseous refrigerant and liquid refrigerant, so as to fully cool the cooling plate 210 and prevent the gaseous refrigerant from affecting the throttling effect of the first throttling device 131 . At the same time, the first throttling device 131 is located between the gas-liquid separator 150 and the radiator plate 210, so that the refrigerant passing through the radiator plate 210 is the refrigerant after throttling, and the use of a small amount of refrigerant can make the radiator plate 210 obtain good performance. cooling effect. The second condenser 122 is used to cool the gaseous refrigerant into a liquid refrigerant, so as to ensure the cooling effect of the entire refrigeration system, and at the same time avoid adverse effects of the gaseous refrigerant on the second throttling device 132 .

Based on the embodiment in FIG. 1 , as shown in FIG. 2 , under the condition that other connection methods remain unchanged, the heat dissipation pipe 160 is directly connected to the air return port or the air supply port of the compressor 110. If the refrigerant in the heat dissipation pipe 160 flows through the heat dissipation The plate 210 is referred to as gaseous refrigerant, and the heat dissipation pipe 160 is directly connected to the compressor 110 to speed up the circulation of the refrigerant, and also prevent the gaseous refrigerant from entering the evaporator assembly 140 from affecting the evaporation and heat dissipation of other refrigerants.

Based on the embodiment in FIG. 1 , as shown in FIG. 3 , under the condition that other connection modes remain unchanged, the first throttling device 131 is positioned at the downstream of the radiator plate 210 , and the first throttling device 131 is used to control the heat dissipation in the cooling pipe 160 The refrigerant is throttled so that the refrigerant absorbs heat in the evaporator 140 to achieve refrigeration, thereby improving the refrigeration effect of the refrigeration system.

Based on the embodiment in FIG. 3 , as shown in FIG. 4 , under the condition that other connection methods remain unchanged, the heat dissipation pipe 160 is directly connected to the air return port or the air supply port of the compressor 110. If the refrigerant in the heat dissipation pipe 160 flows through the heat dissipation The plate 210 is referred to as gaseous refrigerant, and the heat dissipation pipe 160 is directly connected to the compressor 110 to speed up the cycle utilization of the refrigerant, and also prevent the gaseous refrigerant from entering the evaporator assembly 140 from affecting the evaporation and heat dissipation of other refrigerants.

In this embodiment, the refrigerant flowing through is used to take away part of the heat of the electric control board 230 , so as to avoid the problems of low heat dissipation efficiency and complex structure simply relying on air convection. And because the size of the heat dissipation plate 210 is reduced, the cost of the heat dissipation device is reduced. After testing the prototype samples, under the extreme working condition that the temperature around the outdoor unit 20 reaches 60°C, the highest temperature on the electric control board 230 is only about 65°C (the temperature value is far lower than the protection temperature), and the results show that cooling The effect is remarkable, and the heat dissipation requirement of the electric control board 230 under extreme high-temperature operating conditions can be met. At the same time, there is basically no adverse effect on the temperature adjustment function of the air conditioner itself.

It should be further noted that in the description of this embodiment, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A refrigerating system of an inverter air conditioner comprises:

the compressor is used for providing power for refrigerant circulation under the driving of the electric control board;

a condenser assembly connected to a discharge port of the compressor for cooling refrigerant discharged from the compressor, wherein the condenser assembly includes a first condenser;

a gas-liquid separator disposed downstream of the first condenser for separating the refrigerant discharged from the first condenser into a liquid refrigerant and a gaseous refrigerant;

the heat dissipation pipeline is connected with the liquid outlet of the gas-liquid separator and used for introducing the liquid refrigerant to flow;

a heat dissipation plate arranged at the high temperature region of the electric control plate and provided with a pipe groove matched with the heat dissipation pipeline, and

at least part of the heat dissipation pipeline penetrates through the pipe groove so as to take away part of heat of the heat dissipation plate by utilizing the refrigerant flowing in the heat dissipation pipeline.

2. The refrigeration system of the inverter air conditioner of claim 1, further comprising:

an evaporator assembly connected to the return port of the compressor for evaporating the refrigerant flowing through the evaporator assembly;

the heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the evaporator assembly so as to enable the liquid outlet of the gas-liquid separator to be communicated with the evaporator assembly; or

The heat dissipation pipeline is connected between the liquid outlet of the gas-liquid separator and the compressor so as to enable the liquid outlet of the gas-liquid separator to be communicated with the compressor.

3. The inverter air conditioner refrigeration system according to claim 1, further comprising:

and the first throttling device is connected in series with the heat dissipation pipeline and is used for throttling the refrigerant in the heat dissipation pipeline.

4. The inverter air conditioner refrigerating system according to claim 3, wherein

The first throttling device is connected between the liquid outlet of the gas-liquid separator and the heat dissipation plate in series.

5. The refrigerating system of the inverter air conditioner of claim 3, wherein

The first throttle device is connected in series downstream of the heat dissipation plate.

6. The inverter air conditioner refrigerating system according to claim 3, wherein

The first throttling means makes the flow rate of the refrigerant in the heat radiation pipe 0.003 to 0.5 times the flow rate of the refrigerant in the compressor.

7. The refrigerating system of the inverter air conditioner of claim 2, wherein

The condenser assembly further comprises:

the second condenser is connected with the air outlet of the gas-liquid separator and is used for cooling the gaseous refrigerant discharged by the gas-liquid separator;

the refrigerating system of the inverter air conditioner also comprises:

and the second throttling device is connected between the second condenser and the evaporator assembly and is used for throttling the refrigerant discharged by the second condenser.

8. The refrigerating system of the inverter air conditioner of claim 1, wherein

The pipe grooves are uniformly arranged in the heat dissipation plate, and the extending structure of the condensation connecting pipe is matched with the arrangement shape of the pipe grooves;

the pipe chase with the area of contact of heat dissipation pipeline is first area of contact, automatically controlled board with the area of contact of heating panel is the second contact surface, first area of contact is 1 to 6 times of second area of contact.

9. The refrigeration system of the inverter air conditioner of claim 8, wherein the heat radiating plate comprises:

the first side of the first plate body is used for covering a high-temperature area of an electric control plate of the compressor, and the second side of the first plate body is provided with a first groove;

the second plate body is arranged on the second side of the first plate body, and a second groove corresponding to the first groove is formed in the plate surface of the second plate body opposite to the first plate body, so that the first groove and the second groove jointly limit the pipe groove.

10. An inverter air conditioner comprising:

the refrigeration system of the inverter air conditioner according to any one of claims 1 to 9.

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