CN111076350A - Control method and device for starting compressor and air conditioner - Google Patents
Control method and device for starting compressor and air conditioner Download PDFInfo
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- CN111076350A CN111076350A CN201911390218.1A CN201911390218A CN111076350A CN 111076350 A CN111076350 A CN 111076350A CN 201911390218 A CN201911390218 A CN 201911390218A CN 111076350 A CN111076350 A CN 111076350A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Abstract
A control method and device for starting a compressor and an air conditioner relate to the technical field of air conditioners and comprise the following steps: when the compressor is started, acquiring a mode signal, system high pressure and system low pressure; judging whether a preset pressure balance condition is met or not according to the mode signal, the system high-pressure and the system low-pressure; if the preset pressure balance condition is met, the initial load of the compressor during starting is controlled and changed, and the pressure difference between the high-pressure side and the low-pressure side of the refrigerant of the system is controlled and adjusted to balance the pressure. When the air conditioner is restarted after short shutdown, the high pressure and the low pressure of a system refrigerant are not completely balanced, and the air conditioner is easily damaged when the pressure is not balanced. The invention solves the problem of unbalanced pressure when the compressor is started by changing the running state of the compressor and the high-low pressure difference of the refrigerant of the system, ensures that the system can balance the pressure and work normally in time when starting under pressure, avoids the damage caused by unbalanced pressure and improves the use comfort level of users.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling starting of a compressor and an air conditioner.
Background
When the air conditioner is restarted after short-term shutdown, the refrigerant high pressure of the exhaust port of the compressor and the refrigerant low pressure of the return air port of the compressor are not completely balanced, and the compressor is started when the refrigerant high pressure and the refrigerant low pressure do not reach pressure balance, so that the load of the compressor is overlarge, the compressor motor is easily damaged, and the reliability of the operation of the whole air conditioning unit is adversely affected. In order to solve the above problems in the prior art, when an air-conditioning start-up command is received, an air-conditioning system generally sets a waiting time until a refrigerant high pressure and a refrigerant low pressure are balanced, and then starts. Despite the latency, there is a risk that the pressure will start out without being balanced during the latency, causing inconvenience to the user.
Thus, more and more manufacturers are concerned with pressure balancing techniques. The existing air conditioner pressure balance technology needs to arrange a plurality of passages between the compressor return pipe and the compressor exhaust port, and controls the connection or disconnection of the passages through a control valve, so as to realize the pressure balance of the air conditioner. However, the existing air conditioner pressure balancing technology is not beneficial to saving cost and being complex in control operation by setting additional hardware facilities to balance pressure. Generally, the existing pressure balancing techniques are not simple, efficient, and cost effective to balance high and low pressure pressures at air conditioner start-up.
Disclosure of Invention
The invention solves the problem that the existing pressure balancing technology cannot simply and efficiently balance high pressure and low pressure when an air conditioner is started.
In order to solve the above problems, the present invention provides a method for controlling the start of a compressor, comprising:
when the compressor is started, acquiring a mode signal, system high pressure and system low pressure;
judging whether a preset pressure balance condition is met or not according to the mode signal, the system high-pressure and the system low-pressure;
if the preset pressure balance condition is met, the initial load of the compressor during starting is controlled and changed, and the pressure difference between the high-pressure side and the low-pressure side of the refrigerant of the system is controlled and adjusted to balance the pressure.
Therefore, when the compressor is started, whether pressure balance control is needed or not is comprehensively judged according to the mode signal, the system high-pressure and the system low-pressure, and accurate execution of control action is ensured. Meanwhile, the initial load is controlled only by controlling the initial load when the compressor is started and adjusting the pressure difference between the high-pressure side and the low-pressure side of the system refrigerant, and the compressor is controlled to operate in a low-load state in a time period from the start to the normal operation, namely when the pressure is not balanced, so that the condition that the compressor is in fault due to overlarge load pressure during the start is avoided, and meanwhile, the pressure difference between the high-pressure side and the low-pressure side is adjusted only to promote the system to reach the pressure balance, so that the pressure balance can be controlled without the help of extra hardware facilities. The invention combines multiple factors to judge whether pressure balance is needed during starting, and adopts measures of controlling the initial load and adjusting the pressure difference between the high-pressure side and the low-pressure side of the refrigerant of the system, thereby completing simple and efficient pressure balance control during starting of the air conditioner, ensuring effective pressure balance control, enabling the air conditioner to be started without error, avoiding the damage of a compressor and improving the comfort level of users.
Further, the controlling changes an initial load when the compressor is started, and controls and adjusts a pressure difference between a high pressure side and a low pressure side of a system refrigerant to balance pressure, including: and controlling the compressor to start at a preset frequency, and controlling the four-way valve to switch a power-on state or a power-off state.
From this, start with the frequency of predetermineeing through the control compressor, the initial load of compressor has been reduced effectively, security when guaranteeing the compressor start, validity, and switch the power-on or outage state through the control cross valve, when needs pressure balance, the control compressor gas vent is connected the low pressure side all the time, the high pressure side is connected all the time to the compressor return-air inlet, thereby reduce the pressure differential of high pressure side and low pressure side in order to impel the system to reach pressure balance, effectual pressure balance control has been guaranteed, enable the air conditioner and normally take the pressure to start without mistake, the damage of compressor has been avoided.
Further, if the preset pressure balance condition is met, controlling to change an initial load when the compressor is started, and controlling to adjust a pressure difference between a high-pressure side and a low-pressure side of a system refrigerant to balance pressure, the method includes:
and if the mode signal is the refrigeration signal and the pressure difference between the high pressure of the system and the low pressure of the system is greater than a first preset pressure value, controlling to execute a first control action, wherein the first control action comprises controlling the compressor to start at the lowest frequency, controlling the four-way valve to be switched to the power-on state, controlling the outdoor fan and the throttling mechanism to be opened, and controlling the indoor fan to be closed.
From this, judge that the pressure is uneven under the refrigeration condition, carry out first control action, guarantee effectively to reduce the pressure differential of high-pressure side and low pressure side under the refrigeration condition, therefore reached the purpose of in time adjusting both sides pressure according to the state of difference, make the air conditioner maintain suitable pressure differential operation when starting, guaranteed the high-efficient safe start-up of air conditioner, improve user's convenient to use degree.
Further, after the first control action is executed, the method further includes:
and if the high-pressure of the system is equal to the low-pressure of the system, controlling the four-way valve to be switched to the power-off state, and controlling the indoor fan to be started.
From this, under the refrigeration state, when judging the pressure differential when too big, carry out first control action after, the pressure differential of high-pressure side and low pressure side can slowly reduce, and until the pressure differential of both sides is zero, at this moment, system high pressure equals system low pressure, has reached pressure balance, needs timely adjustment, and the control cross valve switches to the outage state to the fan is opened in the control room, guarantees normal refrigeration operation, and convenience of customers uses.
Further, if the preset pressure balance condition is met, controlling to change an initial load when the compressor is started, and controlling to adjust a pressure difference between a high-pressure side and a low-pressure side of a system refrigerant to balance pressure, the method includes:
and if the mode signal is the heating signal and the pressure difference between the high pressure of the system and the low pressure of the system is greater than the first preset pressure value, controlling to execute a second control action, wherein the second control action comprises controlling the compressor to start at the lowest frequency, controlling the four-way valve to be switched to a power-off state, controlling an outdoor fan and a throttling mechanism to be opened, and controlling an indoor fan to be closed.
Therefore, the pressure imbalance under the heating condition is judged, the second control action is executed, the pressure difference between the high-pressure side and the low-pressure side is effectively reduced under the heating condition, the purpose of timely adjusting the pressures of the two sides according to different states is achieved, the air conditioner is enabled to maintain the proper pressure difference to operate when being started, the efficient and safe starting of the air conditioner is guaranteed, and the use convenience of a user is improved.
Further, after executing the second control action, the method further includes:
and if the high-pressure of the system is equal to the low-pressure of the system, controlling the four-way valve to be switched to the power-on state, and controlling the indoor fan to be started.
Therefore, in the heating state, when the judgment pressure difference is too large, after the second control action is executed, the pressure difference between the high-pressure side and the low-pressure side can be slowly reduced until the pressure difference between the two sides is zero, the high-pressure of the system is equal to the low-pressure of the system at the moment, the pressure balance is achieved, the adjustment is needed in time, the four-way valve is controlled to be switched to the power-on state, the indoor fan is controlled to be opened, the normal heating operation is guaranteed, and the use of a user.
The second objective of the present invention is to provide a compressor start control device, which controls the load of the compressor and the pressure difference between the high pressure side and the low pressure side of the system according to the pressure conditions at the two sides of the air conditioner compressor, so as to simply and efficiently reduce the pressure difference between the high pressure side and the low pressure side, ensure effective pressure balance adjustment, enable the air conditioner to start normally and efficiently all the time, and improve the comfort level of users.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control apparatus for start-up of a compressor, comprising:
the acquisition unit is used for acquiring a mode signal, system high pressure and system low pressure when the compressor is started;
the processing unit is used for judging whether a preset pressure balance condition is met or not according to the mode signal, the system high-pressure and the system low-pressure;
and the control unit is used for controlling and changing the initial load when the compressor is started when the preset pressure balance condition is met, and controlling and adjusting the pressure difference between the high-pressure side and the low-pressure side of the system refrigerant to balance the pressure.
Compared with the prior art, the compressor starting control device and the compressor starting control method have the same beneficial effects, and are not repeated herein.
The third objective of the present invention is to provide an air conditioner, which controls the load of the compressor and the pressure difference between the high pressure side and the low pressure side of the system according to the pressure conditions at the two sides of the air conditioner compressor, so as to simply and efficiently reduce the pressure difference between the high pressure side and the low pressure side, ensure effective pressure balance adjustment, enable the air conditioner to start normally and efficiently all the time, and improve the comfort level of users.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program is read by the processor and runs to realize the control method for starting the compressor.
Compared with the prior art, the air conditioner and the control method for starting the compressor have the same beneficial effects, and are not repeated herein.
Further, the air conditioner includes a first pressure sensor and a second pressure sensor, the first pressure sensor is disposed at the exhaust port of the compressor to detect the system high pressure, and the second pressure sensor is disposed at the return port of the compressor to detect the system low pressure.
From this, set up first pressure sensor and second pressure sensor and ensure to judge the pressure differential of both sides accurately to the pressure at real-time supervision compressor both ends, when the pressure differential reaches certain extent, carry out corresponding pressure balance control action, make the system can carry out pressure measurement, pressure regulation and control in real time, guarantee the normal start of system, avoid the damage that the pressure differential is too big to bring.
A fourth objective of the present invention is to provide a computer readable storage medium, which controls the load of the compressor and the pressure difference between the high pressure side and the low pressure side of the system according to the pressure conditions at the two sides of the compressor of the air conditioner, so as to simply and efficiently reduce the pressure difference between the high pressure side and the low pressure side, ensure effective pressure balance adjustment, enable the air conditioner to be started normally and efficiently all the time, and improve the comfort level of users.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer-readable storage medium, which stores a computer program that, when read and executed by a processor, implements the above-described control method for compressor start-up.
The beneficial effects of the computer readable storage medium and the control method for starting the compressor are the same as those of the prior art, and are not described herein again.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for controlling the start-up of a compressor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a flow direction of a refrigerant under normal refrigeration conditions according to an embodiment of the present invention;
FIG. 3 is a schematic view of refrigerant flow direction for pressure balance in refrigeration according to an embodiment of the present invention;
FIG. 4 is a schematic view of a refrigerant flow direction with pressure balance in a heating situation according to an embodiment of the present invention;
FIG. 5 is a schematic view of a refrigerant flow direction under a normal heating condition according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a control device for starting the compressor according to an embodiment of the present invention;
reference numerals:
the system comprises a compressor 1, a four-way valve 2, an outdoor fan 3, a throttling mechanism 4, a first stop valve 5, an indoor fan 6, a second stop valve 7, a first pressure sensor 8 and a second pressure sensor 9.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
When the air conditioner is restarted after short shutdown, the high pressure and the low pressure of a system refrigerant are not completely balanced, and the system refrigerant is easy to start under pressure at the moment. The existing air conditioner pressure balance technology is provided with a plurality of passages between a compressor return pipe and an exhaust port of a compressor, and the communication or disconnection of the passages is controlled by a control valve, so that the pressure balance of the air conditioner is realized. However, the existing air conditioner pressure balance technology is not favorable for saving cost by setting additional hardware facilities to balance pressure, and the control operation is complex, the reliability is lower, and the efficient and simple pressure balance starting cannot be realized. The invention provides a control method and device for starting a compressor and an air conditioner, aiming at the problem that the existing pressure balance technology cannot simply and efficiently balance high-pressure and low-pressure when the air conditioner is started.
Fig. 1 is a schematic flow chart of a control method for starting a compressor 1 under pressure according to an embodiment of the present invention, including steps S1 to S3, wherein:
in step S1, a mode signal, a system high pressure, and a system low pressure are acquired when the compressor is started. Therefore, the embodiment of the invention combines various factors and judges whether the high-pressure and the low-pressure on the two sides of the compressor 1 are balanced or not through the mode signal, the system high-pressure and the system low-pressure.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram of a refrigerant flow direction under a normal refrigeration condition according to an embodiment of the present invention. In the embodiment of the invention, the air conditioning system comprises a compressor 1, a four-way valve 2, an outdoor fan 3, a throttling mechanism 4, a first stop valve 5, an indoor fan 6 and a second stop valve 7 which are connected in sequence.
Because the refrigerant flows in different directions in the cooling and heating modes, the description is given in terms of the cooling mode. In the cooling mode, the high pressure side of the compressor 1 is located at the side connected between the compressor 1 and the outdoor fan 3, and the low pressure side of the compressor 1 is located at the side connected between the compressor 1 and the second stop valve 7. Therefore, in a refrigeration state, if the four-way valve 2 is in a power-on state, the exhaust port of the compressor 1, the four-way valve 2 and the second stop valve 7 are sequentially connected, the return port of the compressor 1 is connected with the outdoor fan 3, the exhaust port of the compressor 1 is connected with the low-pressure side, and the return port of the compressor 1 is connected with the high-pressure side; if the four-way valve 2 is in a power-off state, the exhaust port of the compressor 1, the four-way valve 2 and the indoor fan 3 are sequentially connected, the return port of the compressor 1 is connected with the second stop valve 7, the exhaust port of the compressor 1 is connected with the high-pressure side, and the return port of the compressor 1 is connected with the low-pressure side.
In the heating mode, the high-pressure side of the compressor 1 is located on the side where the compressor 1 and the second stop valve 7 are connected to each other, and the low-pressure side of the compressor 1 is located on the side where the compressor 1 and the indoor fan 3 are connected to each other. Therefore, in a heating state, if the four-way valve 2 is in a power-on state, the exhaust port of the compressor 1, the four-way valve 2 and the second stop valve 7 are sequentially connected, the return port of the compressor 1 is connected with the outdoor fan 3, the exhaust port of the compressor 1 is connected with a high-pressure side, and the return port of the compressor 1 is connected with a low-pressure side; if the four-way valve 2 is in a power-off state, the exhaust port of the compressor 1, the four-way valve 2 and the indoor fan 3 are sequentially connected, the return port of the compressor 1 is connected with the second stop valve 7, the exhaust port of the compressor 1 is connected with the low-pressure side, and the return port of the compressor 1 is connected with the high-pressure side.
With reference to fig. 2, in the normal refrigeration operation mode, the four-way valve 2 is turned off, the exhaust port of the compressor 1 is connected to the high-pressure side, and the return port of the compressor 1 is connected to the low-pressure side, so as to achieve the purpose of normal refrigeration, and at this time, the flow direction of the refrigerant for normal refrigeration is: compressor 1-four-way valve 2-outdoor unit (not shown in the figure), throttle mechanism 4-first stop valve 5-indoor unit (not shown in the figure), second stop valve 7-compressor 1. The four-way valve 2 is turned to change by the power failure of the four-way valve 2, so that the flow direction of the refrigerant is the flow direction in the normal refrigeration state, and the normal refrigeration function is completed. Conventionally, the turning direction of the four-way valve 2 can be changed by electrifying and powering off, therefore, no matter how the refrigerant circulates under the cooling and heating states, when the pressure needs to be balanced, the turning direction can be further changed by changing the electrifying and powering off states of the four-way valve 2, thereby controlling and changing the connection mode of the four-way valve 2 and the compressor 1, changing the connection relation of a return air port, an exhaust port, a high pressure side and a low pressure side of the compressor, changing the flow direction of the refrigerant in a short time, controlling the exhaust port of the compressor 1 to be always connected with the low pressure side when the pressure needs to be balanced, always connecting the return air port of the compressor 1 with the high pressure side, ensuring to finish high-efficiency and simple pressure balance measures, and.
In an embodiment of the present invention, as seen in fig. 2, the air conditioning system further comprises a first pressure sensor 8 and a second pressure sensor 9. The first pressure sensor 8 is disposed at the exhaust port of the compressor 1 to detect the system high pressure, and the second pressure sensor 9 is disposed at the return port of the compressor 1 to detect the system low pressure. From this, set up first pressure sensor 8 and second pressure sensor 9 and ensure to judge the pressure differential of both sides accurately to the pressure at real-time supervision compressor 1 both ends, when the pressure differential reaches certain extent, carry out corresponding pressure balance control action, make the system can carry out pressure detection, pressure regulation and control in real time, guarantee the normal start of system, avoid the damage that the too big pressure differential brought.
In step S2, it is determined whether a pressure balance preset condition is satisfied based on the mode signal, the system high pressure, and the system low pressure. In the embodiment of the invention, the mode signals mainly comprise a refrigerating signal and a heating signal, and the preset conditions of pressure balance are different under the refrigerating and heating conditions because the circulating flow directions of the refrigerant are different during the refrigerating and heating. In the embodiment of the invention, the system high pressure is the pressure obtained by the exhaust port of the compressor 1, the system low pressure is the pressure obtained by the return port of the compressor 1, the obtaining of the system high pressure and the system low pressure is beneficial to judging the pressure difference of the system, and whether the pressure imbalance phenomenon exists in the system can be further judged according to the pressure difference. Therefore, the mode signal, the system high pressure and the system low pressure are indexes for effectively judging the refrigerant quantity of the system, and the accuracy of corresponding control action can be ensured.
In the embodiment of the present invention, the mode signal includes a cooling signal and a heating signal, and the preset condition of pressure balance includes a first preset condition and a second preset condition, where: the first preset condition is that the mode signal is a refrigeration signal, and the pressure difference between the high pressure of the system and the low pressure of the system is greater than a first preset pressure value; the second preset condition is that the mode signal is a heating signal, and the pressure difference between the high pressure of the system and the low pressure of the system is greater than the first preset pressure value. Therefore, when the refrigeration signal and the heating signal are received, the high-pressure and the low-pressure of the system are integrated to judge the pressure balance conditions at the two sides of the compressor. Judging the condition of starting under pressure during refrigeration by setting a first preset condition; and setting a second preset condition to judge the condition of starting under pressure during heating. Since the refrigerant flow direction during cooling and heating is different, it is necessary to determine the refrigerant flow direction by a mode signal. When a refrigeration signal and a heating signal are received, the pressure balance conditions of the two sides of the compressor 1 are judged by integrating the high-pressure of the system and the low-pressure of the system, if the difference value of the high-pressure and the low-pressure of the two sides is greater than a certain preset value, the pressure imbalance of the two ends can be determined, whether the pressure imbalance condition exists in the system or not can be accurately and efficiently judged, and the execution accuracy of the corresponding pressure balance control action is ensured.
Optionally, the first preset pressure value is 0.05Mpa, and when the pressure difference between the two sides reaches 0.05Mpa, the need of performing pressurized start can be effectively judged. It can be understood that, in the embodiment of the present invention, the value of the first preset pressure value is obtained through experiments, and the data may be adjusted accordingly according to the actual application requirement of the system, which is not limited thereto.
In step S3, if the preset pressure balance condition is satisfied, the initial load of the compressor at the start is changed, and the pressure difference between the high pressure side and the low pressure side of the system refrigerant is controlled to be adjusted to balance the pressure. In the embodiment of the invention, the initial load is controlled to enable the compressor to operate in a low-load state only by controlling the initial load when the compressor is started and adjusting the pressure difference between the high-pressure side and the low-pressure side of a system refrigerant in a time period from the start to the normal operation, namely when the pressure is not balanced, so that the condition that the compressor is in fault due to overlarge load pressure in the starting process is avoided, and meanwhile, the pressure difference between the high-pressure side and the low-pressure side is only adjusted to enable the system to achieve pressure balance, and the pressure balance can be controlled without extra hardware facilities. The positive pressure difference is converted into the negative pressure difference, so that the low pressure of the system is increased, and the high pressure of the system is reduced, therefore, the system is always in high-efficiency operation, and the use comfort of a user is improved.
In the embodiment of the present invention, the controlling and changing the initial load when the compressor is started and controlling and adjusting the pressure difference between the high pressure side and the low pressure side of the refrigerant of the system to balance the pressure comprises: the compressor 1 is controlled to start at a preset frequency, and the four-way valve 2 is controlled to switch the power-on state or the power-off state. The compressor is controlled to start at a preset frequency, so that the initial load of the compressor is effectively reduced, the safety and the effectiveness of the compressor during starting are ensured, the four-way valve is controlled to switch the power-on state or the power-off state, when pressure balance is needed, the exhaust port of the compressor is controlled to be always connected with the low-pressure side, and the return port of the compressor is always connected with the high-pressure side, so that the pressure difference between the high-pressure side and the low-pressure side is reduced to enable the system to reach the pressure balance, the effective pressure balance control is ensured, the air conditioner can be normally started without error under pressure, and.
In the embodiment of the present invention, if a preset pressure balance condition is satisfied, if the preset pressure balance condition is satisfied, the method for controlling and changing the initial load when the compressor is started and controlling and adjusting the pressure difference between the high pressure side and the low pressure side of the system refrigerant to balance the pressure includes steps S31 to S32:
in step S31, if the mode signal is a refrigeration signal and the pressure difference between the system high pressure and the system low pressure is greater than a first preset pressure value, a first control action is controlled to be executed, where the first control action includes controlling the compressor to start at the lowest frequency, controlling the four-way valve to switch to the power-on state, controlling the outdoor fan and the throttle mechanism to be turned on, and controlling the indoor fan to be turned off.
In the embodiment of the present invention, the first preset condition is that the mode signal is a refrigeration signal, and a pressure difference between a high pressure of the system and a low pressure of the system is greater than a first preset pressure value; if the mode signal is a refrigeration signal and the pressure difference between the system high pressure and the system low pressure is greater than a first preset pressure value, a first preset condition is met, and under the refrigeration condition, the difference between the system high pressure and the system low pressure exceeds a certain range in an initial state, which indicates that the pressures on both sides of the compressor 1 are unbalanced, measures are required to reduce the pressure difference, so that if the pressure difference on both sides is greater than the first preset pressure value in the refrigeration state, a first control action is required to be executed to balance the pressures on both sides. At this moment, control compressor 1 with the operation of lowest frequency, guarantee compressor 1 steady start, can avoid exhausting superheat degree, the not enough problem of oil temperature superheat degree, still can avoid the low pressure side refrigerant not totally evaporate into gaseous state just get into compressor 1, lead to compressor 1 compression to liquid refrigerant, prevent the harm that too high frequency starts to compressor 1 and bring. And the outdoor fan 3 and the throttling mechanism 4 are opened to ensure the flow of the refrigerant, and the indoor fan 6 is closed to prevent the damage to the compressor 1 caused by the operation of the indoor fan 6 when the pressure is not balanced. Meanwhile, the four-way valve 2 is switched to the electrified state, so that an exhaust port of the compressor 1 is connected with a low-pressure side, a high-pressure refrigerant is exhausted from the exhaust port of the compressor 1, the low-pressure side refrigerant is increased at the moment, and the pressure is increased; the return air port of the compressor 1 is connected with the high pressure side, the return air port of the compressor 1 sucks in the refrigerant, at the moment, the refrigerant on the high pressure side is reduced, and the pressure is naturally reduced. From this, the high pressure side reduces pressure, and the low pressure side risees pressure, and the pressure differential at both ends reduces, has guaranteed the pressure balance of taking the pressure to start to avoid the too big harm that brings compressor 1 of the pressure differential of both sides, prolonged compressor 1's life, increased the convenience that the user used.
Specifically, referring to fig. 3, fig. 3 is a schematic flow direction diagram of a refrigerant started under pressure in a refrigeration situation according to an embodiment of the present invention. In the case of refrigeration, the high-pressure side of the compressor 1 is located on the side of the connection between the compressor 1 and the outdoor fan 3, and the low-pressure side of the compressor 1 is located on the side of the connection between the compressor 1 and the second stop valve 7. Under the normal refrigeration running mode, four way valve 2 cuts off the power supply, and the gas vent of compressor 1 connects the high pressure side, and the return air inlet of compressor 1 connects the low pressure side. However, when the pressure starts in the refrigeration mode, the four-way valve 2 is powered on, the connection mode of the four-way valve 2 and the compressor 1 is changed due to the power-on state, the exhaust port of the compressor 1 is connected with the low-pressure side, the return air port of the compressor 1 is connected with the high-pressure side, and the positive pressure difference is converted into the negative pressure difference, so that the pressure difference at the two ends is reduced, and the purpose of balancing the pressure is achieved. At this time, the flow direction of the refrigerant started under pressure in the refrigeration mode is as follows: the compressor 1, the four-way valve 2, the second stop valve 7, the indoor unit (not shown in the figure), the first stop valve 5, the throttling mechanism 4, the outdoor unit (not shown in the figure) and the compressor 1, so that the flow of the refrigerant started under pressure is completed, and the safety, the stability and the reliability of the operation of the compressor 1 are ensured.
In step S32, if the mode signal is the heating signal and the pressure difference between the system high pressure and the system low pressure is greater than the first preset pressure value, a second control action is controlled to be executed, where the second control action includes controlling the compressor to start at the lowest frequency, controlling the four-way valve to switch to the power-off state, controlling the outdoor fan and the throttle mechanism to be turned on, and controlling the indoor fan to be turned off.
In an embodiment of the present invention, the second preset condition is that the mode signal is a heating signal, and a pressure difference between a high pressure of the system and a low pressure of the system is greater than a first preset pressure value, and if the mode signal is the heating signal, and the pressure difference between the high pressure of the system and the low pressure of the system is greater than the first preset pressure value, the second preset condition is satisfied. In the heating condition, the difference between the system high pressure and the system low pressure exceeds a certain range in the initial state, which indicates that the pressures on both sides of the compressor 1 are unbalanced, and measures are required to reduce the pressure difference, so that if the pressure difference on both sides is greater than the first preset pressure value in the heating state, a second control action is required to balance the pressures on both sides. At this moment, control compressor 1 starts with the lowest frequency, guarantees that compressor 1 starts steadily, avoids exhausting the superheat degree, the not enough problem of oil temperature superheat degree, has still avoided the low pressure side refrigerant not completely to evaporate into gaseous state just to get into compressor 1, leads to compressor 1 compression to liquid refrigerant, prevents the harm that too high frequency starts to compressor 1 and bring. And the outdoor fan 3 and the throttling mechanism 4 are opened to ensure the flow of the refrigerant, and the indoor fan 6 is closed to prevent the damage to the compressor 1 caused by the operation of the indoor fan 6 when the pressure is not balanced. Meanwhile, the power-off state of the four-way valve 2 is switched, because the flow directions of the cooling and heating refrigerants are opposite, the exhaust port of the compressor 1 is connected with the low-pressure side, the high-pressure refrigerant is exhausted from the exhaust port of the compressor 1, the low-pressure side refrigerant is increased, and the pressure is increased; the return air port of the compressor 1 is still connected with the high-pressure side, the return air port of the compressor 1 sucks in the refrigerant, at the moment, the refrigerant on the high-pressure side is reduced, and the pressure is naturally reduced. From this, the high pressure side reduces pressure, and the low pressure side risees pressure, and the pressure differential at both ends reduces, has guaranteed the pressure balance of taking the pressure to start to avoid the too big harm that brings compressor 1 of the pressure differential of both sides, prolonged compressor 1's life, increased the convenience that the user used.
Specifically, referring to fig. 4, fig. 4 is a schematic flow direction diagram of a refrigerant started under pressure in a heating situation according to an embodiment of the present invention. In the heating mode, the high-pressure side of the compressor 1 is located at the side where the compressor 1 is connected to the second stop valve 7, and the low-pressure side of the compressor 1 is located at the side where the compressor 1 is connected to the outdoor fan 3. Under the normal heating running mode, four-way valve 2 is electrified, the exhaust port of compressor 1 is connected with the high-pressure side, and the return air port of compressor 1 is connected with the low-pressure side. At the moment, the four-way valve 2 is started under pressure in a heating mode, the four-way valve 2 is powered off, the connection mode of the four-way valve 2 and the compressor 1 is changed in the power-off state, the exhaust port of the compressor 1 is connected with the low-pressure side, the air return port of the compressor 1 is connected with the high-pressure side, and the positive pressure difference is converted into the negative pressure difference, so that the pressure difference at the two ends is reduced, and the purpose of balancing the. At this time, the refrigerant flow direction of the pressurized start in the heating mode is as follows: the compressor 1, the four-way valve 2, the outdoor unit (not shown), the throttling mechanism 4, the first stop valve 5, the indoor unit (not shown), the second stop valve 7 and the compressor 1 are sequentially connected, so that the flow of a refrigerant started under pressure is completed, and the safety, the stability and the reliability of the operation of the compressor 1 are ensured.
In the embodiment of the present invention, after the first control action is executed, the method further includes step S311, where:
in step S311, if the system high pressure is equal to the system low pressure, the four-way valve 2 is controlled to switch to the power-off state, and the indoor fan 6 is controlled to be turned on. Therefore, under the refrigeration condition, after the first control action is executed, the pressure difference between two sides is reduced until the high-pressure of the system is equal to the low-pressure of the system, the pressures of the two sides are balanced, the starting under pressure is stopped at the moment, the normal refrigeration operation is switched, the four-way valve 2 is switched to turn, the exhaust port of the compressor 1 is connected with the high-pressure side, the return port of the compressor 1 is connected with the low-pressure side, the refrigerant normally circulates, and the refrigeration effect is achieved.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram of a refrigerant flow direction under a normal refrigeration condition according to an embodiment of the present invention. In the cooling mode, the high pressure side of the compressor 1 is located at the side connected between the compressor 1 and the outdoor fan 3, and the low pressure side of the compressor 1 is located at the side connected between the compressor 1 and the second stop valve 7. Under the normal refrigeration mode of operation, cross valve 2 outage, the high pressure side is connected to compressor 1 gas vent, and compressor 1 return-air inlet connects the low pressure side, reaches the purpose of normal refrigeration. At this time, the refrigerant flow direction of the normal refrigeration is as follows: the compressor 1, the four-way valve 2, the outdoor unit (not shown), the throttling mechanism 4, the first stop valve 5, the indoor unit (not shown), the second stop valve 7 and the compressor 1 are sequentially connected, so that the normal refrigeration refrigerant flow is completed, and the safety, the stability and the reliability of the operation of the compressor 1 are ensured.
In the embodiment of the present invention, after the second control action is executed, step S321 is further included, where:
in step S321, if the system high pressure is equal to the system low pressure, the four-way valve 2 is controlled to switch to the power-on state, and the indoor fan 6 is controlled to be turned on. Therefore, under the heating condition, after the first control action is executed, the pressure difference between two sides is reduced until the high-pressure of the system is equal to the low-pressure of the system, the pressures of the two sides are balanced, the starting under pressure is stopped at the moment, and the normal cooling operation is switched, so that the four-way valve 2 is switched to turn, the exhaust port of the compressor 1 is connected with the high-pressure side, the return port of the compressor 1 is connected with the low-pressure side, the refrigerant normally circulates, and the cooling effect is.
Specifically, referring to fig. 5, fig. 5 is a schematic view illustrating a refrigerant flow direction under a normal heating condition according to an embodiment of the present invention. In the heating mode, the high-pressure side of the compressor 1 is located at the side where the compressor 1 is connected to the second stop valve 7, and the low-pressure side of the compressor 1 is located at the side where the compressor 1 is connected to the outdoor fan 3. Under the normal heating running mode, cross valve 2 is electrified, and the gas vent of compressor 1 connects the high pressure side, and the return air inlet of compressor 1 connects the low pressure side, reaches the purpose of normal heating. At this time, the refrigerant flow direction in the normal heating mode is: the compressor 1, the four-way valve 2, the second stop valve 7, the indoor fan 6, the first stop valve 5, the throttling mechanism 4, the outdoor fan 3 and the compressor 1 are arranged, so that the normally heated refrigerant flows, and the safety, stability and reliability of the operation of the compressor 1 are ensured.
In the embodiment of the present invention, the throttle mechanism 4 includes an electronic expansion valve, a capillary tube or an electronic expansion valve and a capillary tube connected in parallel, which achieves the purpose of effectively adjusting the refrigerant flow. It should be understood that the choice of the throttling mechanism 4 in the embodiment of the present invention is not limited thereto, as long as the function of adjusting the flow rate is achieved.
In the embodiment of the invention, the first stop valve 5 and the second stop valve 7 are arranged to mainly complete the function of a stop passage, so that the air conditioner is convenient to overhaul. It is to be understood that the arrangement of the first stop valve 5 and the second stop valve 7 in the embodiment of the present invention is not limited thereto as long as the function of the respective stop passages can be achieved.
According to the control method for starting the compressor 1, provided by the embodiment of the invention, whether the control of starting under pressure is needed or not is comprehensively judged according to the mode signal, the system high-pressure and the system low-pressure, so that the control action is accurately executed. Meanwhile, by controlling the compressor 1 and the four-way valve 2, the pressure balance of the high-pressure side and the low-pressure side can be completed without extra hardware facilities, and the pressure balance can be efficiently realized only by controlling the pressure difference. The invention judges whether the pressurized start is needed or not by combining various factors, and adjusts the pressure difference between the high-side pressure of the system and the low-side pressure of the system by controlling the compressor 1 and the four-way valve 2 and changing the connection mode of the four-way valve 2 and the compressor 1 by utilizing the steering of the four-way valve 2, thereby completing simple and efficient pressure balance control when the air conditioner is started, enabling the air conditioner to be started in a pressurized mode all the time, avoiding the damage of the compressor 1 and improving the use comfort level of a user.
Fig. 6 is a schematic structural diagram of a control device 400 for starting a compressor according to an embodiment of the present invention, which includes an obtaining unit 401, a processing unit 402, and a control unit 403.
The obtaining unit 401 is configured to obtain a mode signal, a system high pressure, and a system low pressure when the compressor is started;
the processing unit 402 is configured to determine whether a preset pressure balance condition is satisfied according to the mode signal, the system high pressure, and the system low pressure;
the control unit 403 is configured to control to change an initial load when the compressor is started when a preset pressure balance condition is satisfied, and control to adjust a pressure difference between a high-pressure side and a low-pressure side of a system refrigerant to balance pressure.
The control device for starting the compressor 1 provided by the invention correspondingly controls the load of the compressor 1 and the pressure difference between the high-pressure side and the low-pressure side of the system according to the pressure conditions of the two sides of the air-conditioning compressor 1, simply and efficiently reduces the pressure difference between the high-pressure side and the low-pressure side, ensures effective pressure balance adjustment, enables the air-conditioning to be started normally and efficiently all the time, and improves the comfort level of use of a user.
In another embodiment of the present invention, an air conditioner includes a computer readable storage medium storing a computer program and a processor, when the computer program is read and executed by the processor, the control method for starting the compressor as described above is implemented, and the load of the compressor 1 and the pressure difference between the high pressure side and the low pressure side of the system are correspondingly controlled according to the pressure conditions at the two sides of the air conditioner compressor, so as to simply and efficiently reduce the pressure difference between the high pressure side and the low pressure side, thereby ensuring effective pressure balance adjustment, enabling the air conditioner to be always started normally and efficiently, and improving the comfort level of users.
In the embodiment of the present invention, the air conditioner as described above includes the first pressure sensor 8 and the second pressure sensor 9, the first pressure sensor 8 is disposed at the discharge port of the compressor 1 to detect the system high pressure, and the second pressure sensor 9 is disposed at the return port of the compressor 1 to detect the system low pressure. From this, set up first pressure sensor 8 and second pressure sensor 9 and ensure to judge the pressure differential of both sides accurately to the pressure at real-time supervision compressor 1 both ends, when the pressure differential reaches certain extent, carry out corresponding pressure balance control action, make the system can carry out pressure detection, pressure regulation and control in real time, guarantee the normal start of system, avoid the damage that the too big pressure differential brought.
In another embodiment of the present invention, a computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method for controlling the start of the compressor as described above is implemented, and accordingly, the load of the compressor 1 and the pressure difference between the high-pressure side and the low-pressure side of the system are controlled according to the pressure conditions at the two sides of the compressor of the air conditioner, so as to simply and efficiently reduce the pressure difference between the high-pressure side and the low-pressure side, thereby ensuring effective pressure balance adjustment, enabling the air conditioner to be always started normally and efficiently, and improving the comfort level of users.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for controlling the start-up of a compressor, comprising:
when the compressor is started, acquiring a mode signal, system high pressure and system low pressure;
judging whether a preset pressure balance condition is met or not according to the mode signal, the system high-pressure and the system low-pressure;
if the preset pressure balance condition is met, the initial load of the compressor during starting is controlled and changed, and the pressure difference between the high-pressure side and the low-pressure side of the refrigerant of the system is controlled and adjusted to balance the pressure.
2. The method as claimed in claim 1, wherein the controlling changes an initial load at the start of the compressor and controls to adjust a pressure difference between a high pressure side and a low pressure side of a system refrigerant to balance pressures, comprising: and controlling the compressor to start at a preset frequency, and controlling the four-way valve to switch a power-on state or a power-off state.
3. The method as claimed in claim 2, wherein if the preset pressure balance condition is satisfied, the method for controlling to change the initial load when the compressor is started and controlling to adjust the pressure difference between the high pressure side and the low pressure side of the system refrigerant to balance the pressure comprises:
and if the mode signal is the refrigeration signal and the pressure difference between the high pressure of the system and the low pressure of the system is greater than a first preset pressure value, controlling to execute a first control action, wherein the first control action comprises controlling the compressor to start at the lowest frequency, controlling the four-way valve to be switched to the power-on state, controlling the outdoor fan and the throttling mechanism to be opened, and controlling the indoor fan to be closed.
4. The method of controlling compressor startup as set forth in claim 3, wherein after performing said first control action, further comprising:
and if the high-pressure of the system is equal to the low-pressure of the system, controlling the four-way valve to be switched to the power-off state, and controlling the indoor fan to be started.
5. The method as claimed in claim 2, wherein if the preset pressure balance condition is satisfied, the method for controlling to change the initial load when the compressor is started and controlling to adjust the pressure difference between the high pressure side and the low pressure side of the system refrigerant to balance the pressure comprises:
and if the mode signal is the heating signal and the pressure difference between the high pressure of the system and the low pressure of the system is greater than the first preset pressure value, controlling to execute a second control action, wherein the second control action comprises controlling the compressor to start at the lowest frequency, controlling the four-way valve to be switched to a power-off state, controlling an outdoor fan and a throttling mechanism to be opened, and controlling an indoor fan to be closed.
6. The method of controlling compressor startup as set forth in claim 5, wherein after performing said second control action, further comprising:
and if the high-pressure of the system is equal to the low-pressure of the system, controlling the four-way valve to be switched to the power-on state, and controlling the indoor fan to be started.
7. A control apparatus for starting a compressor, comprising:
the acquisition unit is used for acquiring a mode signal, system high pressure and system low pressure when the compressor is started;
the processing unit is used for judging whether a preset pressure balance condition is met or not according to the mode signal, the system high-pressure and the system low-pressure;
and the control unit is used for controlling and changing the initial load when the compressor is started when the preset pressure balance condition is met, and controlling and adjusting the pressure difference between the high-pressure side and the low-pressure side of the system refrigerant to balance the pressure.
8. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the control method of compressor startup according to any one of claims 1 to 6.
9. The air conditioner according to claim 8, comprising a first pressure sensor provided at a discharge port of the compressor to detect a system high pressure and a second pressure sensor provided at a return port of the compressor to detect a system low pressure.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the control method of compressor start-up according to any one of claims 1 to 6.
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