CN115875881A - Control method of air conditioner refrigerating system and air conditioner - Google Patents
Control method of air conditioner refrigerating system and air conditioner Download PDFInfo
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- CN115875881A CN115875881A CN202111129401.3A CN202111129401A CN115875881A CN 115875881 A CN115875881 A CN 115875881A CN 202111129401 A CN202111129401 A CN 202111129401A CN 115875881 A CN115875881 A CN 115875881A
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Abstract
The invention provides a control method of an air conditioner refrigerating system and an air conditioner. The refrigeration system comprises a compressor, a reversing valve, an outdoor unit heat exchanger, a main throttle valve and an indoor unit heat exchanger which are sequentially connected through a refrigeration cycle pipeline, the main throttle valve is connected with a cooling branch in parallel, the cooling branch penetrates into a temperature equalizing plate arranged on a high-temperature area of an electric control plate, heat dissipated from the high-temperature area is taken away through a refrigerant introduced into the refrigeration system, a branch control valve is connected to the cooling branch in series, and the control method comprises the following steps: acquiring an operation mode of an air conditioner; in the refrigeration mode, the opening degree of the branch control valve is adjusted, so that the temperature at the outlet of the cooling branch is maintained within a preset temperature range; in the heating mode, the opening degree of the branch control valve is a preset fixed opening degree, so that the proportion of the refrigerant flow flowing through the cooling branch to the total flow is in a set proportion range. The scheme of the invention improves the cooling capacity and the temperature regulation efficiency.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for a refrigerating system of an air conditioner and the air conditioner.
Background
The electric control board of the outdoor unit of the air conditioner is provided with a high-power electric control device for driving the compressor, and the high-power electric control device can generate heat seriously in the working process. The heat productivity of IPM (Intelligent Power Module) is about 60% of the total heat productivity, the heat flux density is the highest, and the heat dissipation problem is an important influence factor affecting the performance of the air conditioner.
The air conditioner in the prior art generally installs special radiating fins for the electric control board, and the radiating fins are attached to the electric control board, so that the radiating area is enlarged. The radiating fins are also matched with an outdoor unit fan, and airflow formed by the outdoor unit fan and mainly used for radiating the condenser is used for accelerating the radiation. The electric control board heat dissipation technology has low heat dissipation efficiency, and particularly under the condition of high outdoor environment temperature, the working temperature of an electric control device is very high, and heat dissipation is urgently needed. At the moment, the heat dissipation condition of the electric control devices such as IPM and the like is easy to deteriorate, and the compressor can only reduce the operating frequency so as to reduce the heat productivity of the electric control devices, thereby greatly reducing the cold quantity of the whole machine. In order to improve the cooling effect, one solution is to use larger-sized heat dissipation fins, which results in large material consumption of the cooling module and further greatly increased cost.
In the prior art, the refrigerant of the refrigeration system of the air conditioner is utilized to radiate the electric control board, however, the radiating mode is difficult to control, the temperature adjusting function of the air conditioner is easily affected, and the energy consumption of the air conditioner is increased. On the other hand, most of the existing air conditioners have a refrigeration mode and a heating mode, because the refrigeration systems in the two modes have different flow directions of the refrigerant and different operation states of components, the scheme of utilizing the refrigerant to cool the electric control board can greatly reduce the efficiency of the refrigeration systems in certain modes.
Disclosure of Invention
The invention aims to provide a control method of an air conditioner refrigerating system for improving the heat dissipation efficiency of an electric control board and an air conditioner.
A further object of the present invention is to reduce the effect of the cooling of the electrically controlled panel on the temperature conditioning function of the air conditioner.
According to one aspect of the present invention, there is provided a control method of a refrigeration system of an air conditioner, wherein the refrigeration system includes a compressor, a reversing valve, an outdoor unit heat exchanger, a main throttle valve, and an indoor unit heat exchanger, which are sequentially connected by a refrigeration cycle pipe, wherein the reversing valve operates the air conditioner in a cooling mode or a heating mode by changing a flow direction of a refrigerant in the refrigeration system, cooling branches are connected in parallel to both sides of the main throttle valve, the cooling branches penetrate a temperature equalizing plate disposed on a high temperature area of an outdoor unit electric control plate of the air conditioner, heat emitted from the high temperature area is taken away by the refrigerant introduced into the refrigeration system, branch control valves are connected in series to the cooling branches, and the control method includes:
acquiring operation modes of an air conditioner, wherein the operation modes comprise a heating mode and a refrigerating mode;
when the operation mode is a refrigeration mode, adjusting the opening degree of the branch control valve to maintain the temperature at the outlet of the cooling branch within a preset temperature range;
and when the operation mode is the heating mode, the opening degree of the branch control valve is set to be a preset fixed opening degree, so that the proportion of the refrigerant flow passing through the cooling branch to the total flow is in a set proportion range.
Optionally, the step of adjusting the opening degree of the bypass control valve includes:
detecting the ambient temperature of the environment where the outdoor unit of the air conditioner is located so as to equalize the temperature of the temperature plate;
inquiring a preset opening value corresponding to the ambient temperature and the temperature of the temperature-equalizing plate from a preset corresponding relation table, wherein the corresponding relation table is used for storing the corresponding relation among the ambient temperature, the temperature of the temperature-equalizing plate and the preset opening value, which is formulated according to the test result;
and adjusting the branch control valve according to the preset opening degree value.
Optionally, after the step of adjusting the bypass control valve according to the preset opening degree value, the method further comprises:
acquiring the temperature of a heat exchanger of an indoor unit and the temperature of an air suction port of a compressor;
comparing the temperature of the heat exchanger of the indoor unit with the temperature of an air suction port of the compressor;
and adjusting the opening of the main throttle valve according to the comparison result of the temperature of the heat exchanger of the indoor unit and the temperature of the air suction port of the compressor.
Optionally, the step of adjusting the opening degree of the main throttle valve according to the comparison result of the temperature of the heat exchanger of the indoor unit and the temperature of the suction port of the compressor comprises:
and reducing the opening degree of the main throttle valve under the condition that the temperature of a suction port of the compressor is less than or equal to a first threshold value, wherein the first threshold value is the sum of the temperature of the heat exchanger of the indoor unit and a first set value.
Alternatively, the speed of decrease in the opening degree of the main throttle valve decreases as the difference between the first threshold value and the suction port temperature of the compressor decreases.
Optionally, the step of adjusting the opening degree of the main throttle valve according to the comparison result of the temperature of the heat exchanger of the indoor unit and the temperature of the suction port of the compressor comprises:
and under the condition that the temperature of the suction port of the compressor is greater than or equal to a second threshold value, increasing the opening degree of the main throttle valve, wherein the second threshold value is the sum of the temperature of the heat exchanger of the indoor unit and a second set value.
Alternatively, the speed of increase of the opening degree of the main throttle valve increases as the difference between the suction port temperature of the compressor and the second threshold value increases.
Optionally, after the step of adjusting the bypass control valve according to the preset opening degree value, the method further comprises:
acquiring the temperature of the IPM of the electric control board;
judging whether the temperature of the IPM is greater than a preset protection temperature or not;
and if so, blocking the gate drive circuit of the IPM and outputting a fault signal.
Optionally, setting the proportion range to be 15% -60%; and/or
The temperature range is set according to the dew point temperature of the environment where the outdoor unit of the air conditioner is located.
According to another aspect of the present invention, there is also provided an air conditioner including:
the refrigeration system comprises a compressor, a reversing valve, an outdoor unit heat exchanger, a main throttle valve and an indoor unit heat exchanger which are sequentially connected through a refrigeration cycle pipeline, wherein the reversing valve enables the air conditioner to operate in a refrigeration mode or a heating mode by changing the flow direction of a refrigerant in the refrigeration system;
the outdoor unit electric control board is provided with a temperature equalizing board in a high-temperature area;
the cooling branch circuits are connected in parallel with two sides of the main throttle valve, penetrate through the temperature equalizing plate, take away heat emitted by a high-temperature area through a refrigerant introduced into the refrigerating system, and are connected with branch circuit control valves in series;
a controller comprising a memory and a processor, wherein the memory stores a machine executable program which when executed by the processor implements a method of controlling an air conditioner refrigeration system according to any one of claims 1 to 9.
According to the control method of the air conditioner refrigeration system, the cooling branch penetrates through the temperature equalizing plate arranged on the high-temperature area of the electric control plate of the outdoor unit of the air conditioner. The refrigerant in the refrigeration cycle pipeline exchanges heat with the temperature equalizing plate in the process of passing through the cooling pipeline, so that the cooling is realized. The heat of part of the electric control board is taken away by the flowing refrigerant, so that the problems of low efficiency and complex structure of heat dissipation by simply relying on air convection are avoided, the size of the temperature equalizing plate can be reduced, and the cost of a heat dissipation device is reduced. The opening degree adjusting strategy of the branch control valve is configured according to the operation mode of the air conditioner, and the branch control valve is controlled in real time when the air conditioner operates in a refrigeration mode; when the air conditioner operates in a heating mode, the opening degree of the branch control valve is a preset fixed opening degree. The control mode of the branch control valve is selectively adjusted according to the operation mode of the air conditioner, and the efficiency requirements of the refrigeration system in different operation modes are met.
Further, according to the control method of the air conditioner refrigeration system, the opening degree of the branch control valve enables the outlet temperature of the cooling branch to be maintained within a preset temperature range according to the environment temperature of the environment where the outdoor unit of the air conditioner is located and the cooling temperature of the high-temperature area in the air conditioner refrigeration mode, so that the heat dissipation requirement of the electric control board is met, and the influence on the temperature regulation function of the air conditioner refrigeration system is avoided.
Furthermore, the control method of the air conditioner refrigerating system further adjusts the on-off of the main throttle valve according to the comparison result of the temperature of the evaporator and the temperature of the air suction port of the compressor, ensures that the whole machine runs under high energy efficiency, and thoroughly eliminates the influence of the cooling branch on the system.
Furthermore, the control method of the air conditioner refrigeration system is flexible and reliable in control, and the working reliability of the air conditioner is greatly improved.
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 example and not by way of 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 block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration system of an air conditioner according to one embodiment of the present invention;
fig. 3 is a schematic view of an outdoor unit electric control box of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic view of an electric control panel of an air conditioner according to an embodiment of the present invention;
fig. 5 is a schematic view of a temperature equalizing plate of an air conditioner according to an embodiment of the present invention;
fig. 6 is an exploded view of a temperature equalizing plate of an air conditioner according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a method of controlling an air conditioner refrigeration system according to one embodiment of the present invention;
fig. 8 is a detailed flowchart of a control method of a refrigerating system of an air conditioner according to an embodiment of the present invention; and
fig. 9 is a schematic view of a controller of an air conditioner according to an embodiment of the present invention.
Detailed Description
FIG. 1 is a schematic block diagram of an air conditioner according to one embodiment of the present invention; and fig. 2 is a schematic view of a refrigerating system of an air conditioner according to an embodiment of the present invention.
The air conditioner includes an indoor unit 30 disposed in a heat exchange environment and an outdoor unit 20 disposed in an outdoor environment. The outdoor unit 20 and the indoor unit 30 are connected to each other through a refrigeration cycle duct and an electric circuit. Wherein the refrigeration cycle pipe is used to connect a refrigeration component in the indoor unit 30 and a refrigeration component in the outdoor unit 20 to form a refrigerant cycle circuit. The heat exchange between the indoor and the outdoor is realized through the circulation flow of the refrigerant.
The indoor unit 30 may include an indoor heat exchanger 140, an indoor fan (not shown) and the like, and the indoor fan may be configured to have various structures such as a wall-mounted structure, a vertical structure, a ceiling-mounted structure and the like, and the indoor fan is configured to promote airflow flowing through the indoor heat exchanger 140 to adjust the temperature of the indoor environment. The air speed of the indoor fan is matched with the temperature of the indoor unit heat exchanger 140, so that the indoor environment can meet the temperature regulation requirement.
The outdoor unit includes an outdoor heat exchanger 120, an outdoor fan (not shown), a compressor 110, a main throttle 131, and the like. The compressor 110 is preferably an inverter compressor driven by an inverter motor. The rotation speed of the compressor 110 is adjusted according to the refrigeration requirement, and the refrigeration capacity of the air conditioner is improved by increasing the rotation speed of the compressor. The compressor 110 is driven by the electronic control board 230 to provide power for refrigerant circulation, and the power supply frequency is adjusted by the electronic control board 230 to adjust the rotation speed. The outdoor heat exchanger 120 cools the refrigerant discharged from the compressor 110. The outdoor fan generates a heat radiation airflow for radiating heat of the outdoor heat exchanger 120. Since the electric control board 230 is disposed at the outdoor unit 20, it is also called an outdoor unit electric control board.
The electronic control panel 230 is used for controlling an operation state of the outdoor unit 20, and includes an inverter device, such as an IPM (Intelligent Power Module), for driving the compressor 110. When electric control board 230 drives compressor 110 to operate, its power element generates heat, and as the cooling load increases and the state change frequency increases, the heat generation amount may increase, where IPM is the component with the largest heat generation amount, and generally the component with the highest temperature. The refrigerant is introduced into vapor chamber 210 above electronically controlled panel 230 and at least a portion of the heat is removed.
The rotational speed of the compressor 110 is adjusted according to the refrigeration demand. Thereby increasing the cooling capacity of the air conditioner by increasing the rotation speed of the compressor 110. The variable frequency air conditioner improves the electric energy efficiency by using a variable frequency technology and reduces the temperature fluctuation. The frequency conversion technology is to change the power supply frequency of the compressor 110 by a series of processing such as rectification, filtering, inversion and the like of the ac power of the power grid, and generally realizes the function of the compressor through the electronic control board 230. Since the frequency conversion technique itself is well known to those skilled in the art, it will not be described herein.
The refrigerating system includes a compressor 110, an outdoor heat exchanger 120, a main throttle valve 131, and an indoor heat exchanger 140, which are sequentially connected by a refrigeration cycle pipe. The compressor 110 is driven by a motor to rotate continuously as a power of a refrigeration cycle, and provides a power of a refrigerant cycle.
The refrigeration system can also be provided with a reversing valve 150 to change the flow direction of the refrigerant, so as to realize the refrigeration or heating function. The reversing valve 150 is connected to an exhaust port of the compressor 110 and configured to change a flow direction of the refrigerant to selectively return the refrigerant to the compressor 110 after passing through the outdoor heat exchanger 120, the main throttle valve 131, and the indoor heat exchanger 140, thereby implementing a cooling mode; or, the refrigerant passes through the indoor heat exchanger 140, then flows through the main throttle valve 131 and the outdoor heat exchanger 120, and then returns to the compressor 110, thereby implementing the heating mode. The directional valve 150 may preferably be implemented using a four-way valve. The direction of the solid arrows in fig. 2 is the flow direction of the refrigerant when the air conditioner is operating in the cooling state. The direction of the dashed arrow in fig. 2 is the flow direction of the refrigerant when the air conditioner is operating in the heating state.
The gaseous refrigerant in the indoor heat exchanger 140 is pumped out, and the pressure and temperature of the refrigerant vapor are increased by compression, so as to create a condition for transferring the heat of the refrigerant vapor to the external environment medium, that is, the compressor 110 compresses the low-temperature and low-pressure refrigerant vapor to a high-temperature and high-pressure state.
In the cooling state of the air conditioner, the outdoor heat exchanger 120 is a condenser, and the indoor heat exchanger 140 is an evaporator. The condenser uses the environment cooling refrigerant to take away the heat of the high-temperature and high-pressure refrigeration vapor from the compressor 110, so that the high-temperature and high-pressure refrigerant vapor is cooled and condensed into high-pressure and normal-temperature refrigerant liquid.
The refrigerant liquid with high pressure and normal temperature passes through the main throttle valve 131 to obtain low-temperature and low-pressure refrigerant, and then is sent into the evaporator 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 compressor 110 extracts the gaseous refrigerant in the indoor heat exchanger 140 again, and the pressure and temperature of the refrigerant vapor are increased by compression, so as to create a condition for transferring the heat of the refrigerant vapor to the 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 low-temperature and low-pressure refrigerant liquid throttled by the indoor heat exchanger 140 is evaporated (boiled) in the refrigerant liquid to become vapor, and the vapor absorbs ambient heat, so that the ambient temperature is reduced, and the purpose of refrigeration is achieved.
Since the outdoor heat exchanger 120 releases heat, the outdoor unit 20 of the air conditioner is in a cooling mode, and the temperature of the environment is high, and the electric control board 230 itself is operated to release heat, which causes overheating of the electric control board 230, especially IPM, and a forced cooling measure is required.
When the air conditioner is operated in a heating state, the outdoor heat exchanger 120 is an evaporator, and the indoor heat exchanger 140 is a condenser.
The air conditioner of the embodiment is additionally provided with a cooling assembly. Fig. 3 is a schematic view of an outdoor unit electrical control box 220 of an air conditioner according to an embodiment of the present invention; fig. 4 is a schematic view of an electric control board 230 of an air conditioner according to an embodiment of the present invention; fig. 5 is a schematic view of a temperature-uniforming plate 210 of an air conditioner according to an embodiment of the present invention; fig. 6 is an exploded view of a temperature-uniforming plate 210 of an air conditioner according to an embodiment of the present invention.
The cooling assembly 200 may generally include: a vapor chamber 210 and a cooling branch 123. The temperature equalization plate 210 is disposed at a high temperature region of the outdoor unit electronic control panel 230 to absorb heat emitted during the operation of the outdoor unit electronic control panel 230. The temperature equalization plate 210 may be made of aluminum or other heat conductive material, and may have a shape that is compatible with the electronic control plate 230, and may cover at least the high temperature area of the electronic control plate 230, i.e., the power device of the electronic control plate 230. The temperature equalizing plate 210 can be fixed with the electric control plate 230 by fixing methods such as screw bonding, and one surface of the temperature equalizing plate 210, which is attached to the electric control plate 230, can have a corresponding positioning structure and is coated with heat-conducting silica gel and the like to reduce thermal resistance. The temperature equalizing plate 210 may be a rectangular plate, and one side of the temperature equalizing plate is disposed adjacent to the electric control plate 230.
The cooling branch 123 is connected to both sides of the main throttle 131, that is, the cooling branch 123 is disposed in parallel with the main throttle and penetrates the temperature equalizing plate 210, so that the refrigerant introduced into the refrigeration system cools the temperature equalizing plate 210, and the branch control valve 124 is connected in series to the cooling branch 123.
In some embodiments, the temperature-uniforming plate 210 has a pipe groove matched with the cooling branch 123, and the cooling branch 123 is arranged in the pipe groove in a penetrating way, so as to realize reliable matching with the temperature-uniforming plate 210. The cooling branch 123 penetrates out from two ends of the temperature equalizing plate 210 to be connected with other refrigeration cycle pipelines. The contact area between the pipe groove and the cooling branch 123 is a first contact area (that is, the contact area between the inner wall of the pipe groove and the cooling branch 123 can be calculated by the inner diameter of the pipe groove and the contact length between the pipe groove and the cooling branch 123), the contact area between the electric control plate 230 and the temperature equalization plate 210 is a second contact area, and the first contact area is 1 to 6 times of the second contact area. Therefore, the effective heat dissipation area is a reasonable value, overheating caused by excessive cooling and insufficient cooling of the electric control board 230 is avoided, and consumables are saved while the heat dissipation effect of the electric control board 230 is ensured. The shape and the distribution structure of the pipe groove can realize better economical efficiency and heat dissipation effect under the condition of meeting the requirement of the contact area.
The vapor chamber 210 may include: a first plate body 211 and a second plate body 212. The first board 211 has a first side for covering the high temperature area of the electric control board 230, and a second side having a first groove 213. 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 first plate 211 and the second plate 212 have grooves 213 and 214 formed on their opposite surfaces, respectively. The opposing grooves 213, 214 together define a channel upon snap-fitting of the first plate 211 and the second plate 212.
The cross-sectional shape of the tube slots may also be adapted to the shape of the cooling branch 123, and may be, for example, circular, oval, square, rectangular, etc. In order to improve the heat transfer efficiency, in the present embodiment, it is preferable to use a circular cooling branch 123 and a circular-section pipe groove. In order to ensure higher heat exchange efficiency, heat-conducting media such as heat-conducting silica gel can be coated between the cooling branch 123 and the inner wall of the pipe groove.
The vapor chamber 210 is formed by combining plates to form a pipe groove, which is convenient for preparation and maintenance, and is also convenient for connection with the electric control plate 230.
The electric control board 230 is generally disposed in the electric control box 220, and the electric control box 220 is disposed on the top of the outdoor unit. The temperature equalizing plate 210 is attached to the bottom of the electric control plate 230. The cooling branch 123 passes through the electric control box 220 to be connected with a refrigeration circulation pipeline of the air conditioner.
The bypass control valve 124 is an electrically controlled valve, and can controllably adjust its opening degree to change the cooling capacity of the temperature equalization plate 210 by changing the flow rate of the refrigerant flowing through the cooling bypass 123. According to the control method of the air conditioner refrigeration system, the branch control valve 124 and the main throttle valve 131 are adjusted, so that the cooling capacity of the temperature equalizing plate 210 is matched with the operation condition of the air conditioner, the heat dissipation requirement of the electric control plate 230 for normal operation of the air conditioner is met, the influence on the temperature adjusting function of the air conditioner refrigeration system can be avoided, and the air conditioner can operate efficiently.
Fig. 7 is a schematic diagram of a control method of an air conditioner refrigeration system according to an embodiment of the present invention. The control method of the air conditioner refrigerating system comprises the following steps:
step S702, acquiring an operation mode of the air conditioner, namely determining that the air conditioner operates in a heating mode or a cooling mode;
step S704, when the operation mode is the cooling mode, adjusting the opening degree of the branch control valve 124 so as to maintain the temperature at the outlet of the cooling branch 123 within the preset temperature range. The temperature range may be set according to a dew point temperature of an environment where the outdoor unit 20 of the air conditioner is located, and may generally be set to a range of a certain value higher than the dew point temperature and a certain value lower than the alarm temperature, for example, a temperature of 5 degrees celsius higher than the dew point temperature to 10 degrees celsius lower than the alarm temperature.
In step S706, when the operation mode is the heating mode, the bypass control valve 124 is set to a predetermined fixed opening degree such that the ratio of the refrigerant flow rate flowing through the cooling bypass 123 to the total flow rate is within a predetermined ratio range. The proportion is set to be 15-60%.
The opening degree adjusting mode of the branch control valve 124 is configured according to the heating mode and the cooling mode of the air conditioner respectively, and the efficiency requirements of the air conditioner under different modes can be met. On one hand, in the refrigeration mode, the electric control board 230 can be reliably cooled; on the other hand, in the heating mode, the cooling branch 123 serves as a throttling branch, thereby improving the refrigerant circulation efficiency.
In the cooling mode, the adjusting of the opening degree of the bypass control valve may include: detecting the ambient temperature of the environment where the outdoor unit 20 of the air conditioner is located and the temperature of the temperature-uniforming plate 210; inquiring a preset opening value corresponding to the environment temperature and the temperature of the temperature-equalizing plate 210 from a preset corresponding relation table, wherein the corresponding relation table is used for storing the corresponding relation among the environment temperature, the temperature of the temperature-equalizing plate 210 and the preset opening value, which is formulated according to the test result; the bypass control valve 124 is adjusted according to the preset opening degree.
The temperature of the vapor chamber 210 reflects the actual temperature of the high temperature region of the electronic control board 230, that is, the cooling temperature of the electronic control board 230 can be determined by the vapor chamber 210; the environmental temperature reflects the difficulty of the heat dissipation of the temperature equalization plate to the surrounding environment.
An alternative way to adjust the opening of the bypass control valve 124 according to the ambient temperature and the cooling temperature is: inquiring a preset opening value corresponding to the environment temperature and the temperature of the temperature-equalizing plate 210 from a preset corresponding relation table, wherein the corresponding relation among the environment temperature, the temperature of the temperature-equalizing plate 210 and the preset opening value is set in the corresponding relation table in advance according to a test result; and adjusting the branch control valve according to the preset opening degree value. Table 1 shows an example of the above correspondence table.
TABLE 1
In table 1, the ambient temperature and the temperature of the vapor chamber are both given in degrees celsius. As shown in the above corresponding relationship, the preset opening degree value is increased with the increase of the ambient temperature and/or the temperature of the vapor chamber, and the flow rate of the refrigerant flowing through the cooling branch 123 is increased accordingly, so as to improve the cooling capacity and avoid the overheating situation.
Through the adjustment of the branch control valve 124, the outlet temperature of the cooling branch can be ensured to be maintained within a preset temperature range, in particular, normal cooling is ensured, and the working requirement of the electronic control board 230 is met. When the temperature of the temperature equalizing plate and the ambient temperature are highest, the valve opening of the branch control valve 124 is the largest; when the temperature of the temperature equalization plate is low and the ambient temperature is low, the valve opening of the bypass control valve 124 is minimum.
The temperature at the IPM of electronic control board 230 may also be acquired after step S706; judging whether the temperature of the IPM is greater than a preset protection temperature or not; if yes, the gate drive circuit of the IPM is blocked, and a fault signal is output. By combining IPM temperature protection with the cooling measures, comprehensive protection of IPM on the electric control board can be realized, and the reliability of the air conditioner is greatly improved.
The refrigerant flowing through the cooling branch 123 comes from the outdoor heat exchanger 120, the temperature of the refrigerant is generally higher than that of the ambient environment, the temperature of the temperature equalizing plate 210 is taken away by the refrigerant, the problem of condensation caused by the temperature of the temperature equalizing plate 210 being lower than that of the ambient environment can be avoided, and the electrical safety performance is also improved. The other path of refrigerant is throttled by the main throttle valve 131 and enters the indoor heat exchanger 140. In this process, the cooling branch 123 is not throttled, wherein the refrigerant flowing through the main circuit of the main throttle 131 is still relatively large and has little effect on the temperature control performance of the air conditioner.
The control method of the refrigeration system of the air conditioner of the embodiment may further improve the efficiency of the air conditioner by adjusting the opening degree of the main throttle valve 131. The step of adjusting the opening degree of the bypass control valve 124 according to the ambient temperature and the cooling temperature may be followed by: acquiring the temperature of the indoor unit heat exchanger 140 and the temperature of the suction port of the compressor 110; comparing the temperature of the indoor unit heat exchanger 140 with the temperature of the suction port of the compressor 110; the opening degree of the main throttle valve 131 is adjusted according to the result of comparing the temperature of the indoor unit heat exchanger 140 and the suction port temperature of the compressor 110. The temperature of the indoor heat exchanger 140 is denoted as T1, and the suction port temperature of the compressor 110 is denoted as T2.
The adjusting the opening degree of the main throttle valve 131 may specifically include: in the case where the suction port temperature of the compressor 110 is less than or equal to the first threshold value, which is the sum of the temperature of the indoor unit heat exchanger 140 and the first set value, the opening degree of the main throttle valve 131 is decreased, and the rate of decrease in the opening degree of the main throttle valve 131 decreases as the difference between the first threshold value and the suction port temperature of the compressor 110 decreases.
The adjusting the opening degree of the main throttle 131 may specifically include: in the case where the suction port temperature of the compressor 110 is greater than or equal to the second threshold value, the opening degree of the main throttle 131 is increased, and the increasing speed of the opening degree of the main throttle 131 increases as the difference between the suction port temperature of the compressor 110 and the second threshold value, which is the sum of the temperature of the indoor unit heat exchanger 140 and the second set value, increases.
The second set value is a value greater than the first set value. The first set point and the second set point may be set according to an actual state of the air conditioner cooling system, for example, the first set point may be set to 2 and the second set point may be set to 4. That is, when T2 is less than or equal to T1+2, the opening degree of the main throttle 131 is decreased, and when T2 is greater than or equal to T1+4, the opening degree of the main throttle 131 is increased.
The decreasing speed of the opening degree of the main throttle valve 131 decreases as the difference between the first threshold and the temperature of the suction port of the compressor 110 decreases, and one adjustment manner is to decrease in steps, for example, when T2 ≦ T1-2, the opening degree of the main throttle valve 131 decreases, and the closing rate is s1; when T1-2 is more than or equal to T2 and more than or equal to T1+2, the main throttle valve 131 is closed, and the valve closing speed is s2, wherein s1 is more than or equal to s2.
The increasing speed of the opening degree of the main throttle 131 increases as the difference between the temperature of the suction port of the compressor 110 and the second threshold value increases, and one adjustment is to increase the opening degree of the main throttle 131 in steps, for example, when T2 ≧ T1+ 4. The valve opening rate is s3 at this time; when T1+2 is more than or equal to T2 and less than or equal to T1+4, the opening degree of the main throttle valve 131 is increased, and the valve opening rate is s4 at the moment, wherein s3 is more than or equal to s4.
The specific values and the stepped gears and the valve adjusting speed can be set according to the specific configuration of the refrigeration system. On one hand, the method of the embodiment ensures the cooling effect and avoids the condensation risk of the electric control plate 230 caused by excessive cooling, so that the temperature of the temperature-equalizing plate 210 is always higher than the ambient temperature; on the other hand, the control mode of the main throttle valve 131 can ensure that the refrigeration system operates under high energy efficiency, and the influence of the cooling branch 123 on the system is eliminated.
Since the cooling branch 123 has a low refrigerant flow rate, the main throttle 131 can be adjusted by itself, and the adjustment of the opening degree of the branch control valve 124 is performed according to the ambient temperature and the cooling temperature, without being affected by the control of the main throttle 131. But the refrigerant flow of the cooling branch 123 affects the opening degree of the main throttle 131. In order to comprehensively reflect the influence, the main throttle valve 131 adjusts the opening of the valve in a suction superheat degree adjusting manner.
In the heating mode, the opening degree of the branch control valve 124 is a preset fixed opening degree, so that the ratio of the refrigerant flow flowing through the cooling branch to the total flow is within a set ratio range, which may be 15% to 60%, and preferably 20% to 30%, and the cooling branch 123 is used as a bypass flow path for the refrigerant, thereby improving the efficiency of the refrigeration system in the heating mode.
Fig. 8 is a detailed flowchart of a control method of a refrigerating system of an air conditioner according to an embodiment of the present invention. An optional procedure for executing the control method of the air conditioner refrigeration system of the above embodiment is as follows:
step S800, determining the operation mode of the air conditioner, namely judging that the air conditioner operates in a cooling mode or a heating mode;
step S802, in the heating mode, the opening degree of the branch control valve 124 is set to a preset fixed opening degree;
step S804, in the cooling mode, detecting an ambient temperature of an environment where the outdoor unit 20 of the air conditioner is located and obtaining a temperature of the temperature equalization plate 210 of the air conditioner;
step S806, inquiring a preset corresponding relation table to obtain an opening preset value corresponding to the ambient temperature and the temperature of the temperature-equalizing plate;
step S808, adjusting the branch control valve 124 according to the preset opening degree value;
step S810, judging whether the temperature of the IPM is greater than a preset protection temperature; and if so, blocking the gate drive circuit of the IPM and outputting a fault signal. By combining IPM temperature protection with the cooling measures, the comprehensive protection of the IPM on the electric control board can be realized, and the reliability of the air conditioner is greatly improved
Step S812, acquiring a temperature T1 of the indoor unit heat exchanger 140 and a suction port temperature T2 of the compressor 110;
step S814, reducing the opening of the main throttle valve 131 at the speed S1 under the condition that T2 is less than or equal to T1-2;
step S816, under the condition that T1-2 is more than or equal to T2 and more than or equal to T1+, the opening degree of the main throttle valve 131 is reduced at the speed of S2;
step S818, under the condition that T1+2 is more than or equal to T1+4, the opening degree of the main throttle valve 131 is reduced at the speed of S3;
in step S820, the opening of the main throttle 131 is decreased at the speed S4 when T2 is greater than or equal to T1+ 4.
S1 is not less than s2, and s3 is not less than s4. The numerical values in the above process can be determined by testing in advance according to the actual configuration of the air conditioner refrigeration system. The method meets the heat dissipation requirement of the electric control board 230 on one hand, and avoids influencing the temperature adjusting function of the air conditioner refrigerating system on the other hand.
Fig. 9 is a schematic view of a controller 40 of an air conditioner according to an embodiment of the present invention. The air conditioner of the present embodiment is further provided with a controller 40. The controller 40 may include a processor 420, a memory 410. The memory 410 stores a machine-executable program 411, and the machine-executable program 411 is executed by the processor 420 to implement any of the methods of controlling the air conditioner cooling system of the present embodiments. The machine-executable program may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, source code or object code written in any combination of one or more programming languages. Processor 141 may be a single core processor, a multi-core processor, a computing cluster, or any number of other configurations. Memory 142 may include Random Access Memory (RAM), read only memory, flash memory, or any other suitable storage system.
It should be further noted that, in the description of the present embodiment, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Thus, it should be appreciated by those skilled in the art that while 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 control method of a refrigeration system of an air conditioner comprises a compressor, a reversing valve, an outdoor unit heat exchanger, a main throttle valve and an indoor unit heat exchanger which are sequentially connected through a refrigeration cycle pipeline, wherein the reversing valve enables the air conditioner to operate in a refrigeration mode or a heating mode by changing the flow direction of a refrigerant in the refrigeration system, cooling branches are connected in parallel to two sides of the main throttle valve, penetrate through a temperature equalizing plate arranged on a high-temperature area of an outdoor unit electric control plate of the air conditioner, take away heat dissipated by the high-temperature area through the refrigerant introduced into the refrigeration system, and are connected with branch control valves in series, and the control method comprises the following steps:
acquiring operation modes of the air conditioner, wherein the operation modes comprise a heating mode and a cooling mode;
when the operation mode is a refrigeration mode, adjusting the opening degree of the branch control valve to maintain the temperature at the outlet of the cooling branch within a preset temperature range;
and when the operation mode is a heating mode, the opening degree of the branch control valve is set to be a preset fixed opening degree, so that the proportion of the refrigerant flow flowing through the cooling branch to the total flow is in a set proportion range.
2. The control method of an air conditioner refrigerating system as claimed in claim 1, wherein the step of adjusting the opening degree of the bypass control valve includes:
detecting the ambient temperature of the environment where the outdoor unit of the air conditioner is located and the temperature of the temperature equalizing plate;
inquiring a preset opening value corresponding to the ambient temperature and the temperature of the temperature-equalizing plate from a preset corresponding relation table, wherein the corresponding relation table is used for storing the corresponding relation among the ambient temperature, the temperature of the temperature-equalizing plate and the preset opening value, which is formulated according to a test result;
and adjusting the branch control valve according to the preset opening degree value.
3. The method of controlling an air conditioner refrigeration system as recited in claim 2 further comprising, after said step of adjusting said bypass control valve to said preset opening degree value:
acquiring the temperature of the heat exchanger of the indoor unit and the temperature of an air suction port of the compressor;
comparing the temperature of the heat exchanger of the indoor unit with the temperature of the air suction port of the compressor;
and adjusting the opening of the main throttle valve according to the comparison result of the temperature of the heat exchanger of the indoor unit and the temperature of the air suction port of the compressor.
4. The control method of an air conditioner refrigeration system as set forth in claim 3, wherein said step of adjusting the opening degree of said main throttle valve according to the comparison result of the temperature of said indoor unit heat exchanger and the suction port temperature of said compressor comprises:
and reducing the opening degree of the main throttle valve under the condition that the temperature of a suction port of the compressor is less than or equal to a first threshold value, wherein the first threshold value is the sum of the temperature of the heat exchanger of the indoor unit and a first set value.
5. The control method of an air conditioner refrigeration system as recited in claim 4 wherein,
a decreasing speed of the opening degree of the main throttle valve decreases as the difference between the first threshold value and the suction port temperature of the compressor decreases.
6. The control method of an air conditioner refrigeration system as set forth in claim 3, wherein said step of adjusting the opening degree of said main throttle valve according to the comparison result of the temperature of said indoor unit heat exchanger and the suction port temperature of said compressor comprises:
and under the condition that the temperature of the air suction port of the compressor is greater than or equal to a second threshold value, increasing the opening degree of the main throttle valve, wherein the second threshold value is the sum of the temperature of the heat exchanger of the indoor unit and a second set value.
7. The control method of an air conditioner refrigeration system as recited in claim 6 wherein,
the speed of increase of the opening degree of the main throttle valve increases as the difference between the suction port temperature of the compressor and the second threshold value increases.
8. The control method of an air conditioner refrigerating system as recited in claim 2, further comprising after said step of adjusting said bypass control valve according to said opening degree preset value:
acquiring the temperature of the IPM of the electric control board;
judging whether the temperature of the IPM is greater than a preset protection temperature or not;
and if so, blocking the gate drive circuit of the IPM and outputting a fault signal.
9. The control method of an air conditioner refrigeration system as set forth in claim 1, wherein
The set proportion range is 15% -60%; and/or
The temperature range is set according to the dew point temperature of the environment where the outdoor unit of the air conditioner is located.
10. An air conditioner comprising:
the refrigeration system comprises a compressor, a reversing valve, an outdoor unit heat exchanger, a main throttle valve and an indoor unit heat exchanger which are sequentially connected through a refrigeration cycle pipeline, wherein the reversing valve enables the air conditioner to operate in a refrigeration mode or a heating mode by changing the flow direction of a refrigerant in the refrigeration system;
the outdoor unit electric control board is provided with a temperature equalizing plate in a high-temperature area;
the cooling branch is connected in parallel to two sides of the main throttle valve, penetrates through the temperature equalizing plate, takes away heat emitted by the high-temperature area through a refrigerant introduced into the refrigeration system, and is connected with a branch control valve in series;
a controller comprising a memory and a processor, wherein the memory stores a machine executable program that when executed by the processor implements a method of controlling an air conditioner refrigeration system according to any one of claims 1 to 9.
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| CN202111129401.3A CN115875881A (en) | 2021-09-26 | 2021-09-26 | Control method of air conditioner refrigerating system and air conditioner |
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| CN202111129401.3A CN115875881A (en) | 2021-09-26 | 2021-09-26 | Control method of air conditioner refrigerating system and air conditioner |
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