CN113007862B - Air suction side pressure determining method and module, air conditioner control method and device and multi-split air conditioner - Google Patents
Air suction side pressure determining method and module, air conditioner control method and device and multi-split air conditioner Download PDFInfo
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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
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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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- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
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- F24F11/65—Electronic processing for selecting an operating mode
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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
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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
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Abstract
The invention provides a method and a module for determining the air suction side pressure, an air conditioner control method and device and a multi-split air conditioner, and relates to the technical field of air conditioners. The suction side pressure determining method includes determining the inner coil side pressure from the inner coil temperature, determining the pressure loss from the total capacity of the indoor unit in operation and the compressor frequency, and calculating the suction side pressure of the compressor. The method for acquiring the suction side pressure of the compressor can avoid using a low-pressure sensor or a low-pressure switch, reduce the cost, reduce the complexity of the pipeline layout and the risk of equipment failure during operation, and improve the stability of the whole multi-split air conditioner. The air conditioner control method provided by the embodiment of the invention controls the frequency of the compressor according to the air suction side pressure determined by the air suction side pressure determination method. The embodiment of the invention also provides a module and a device for realizing the method and a multi-split air conditioner.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a method and a module for determining air suction side pressure, an air conditioner control method and device and a multi-split air conditioner.
Background
The compressor is a core component of the air conditioner, and in order to keep the low pressure on the suction side of the compressor within a reasonable range, a low pressure sensor or a low pressure switch is usually configured on a suction side pipeline of the compressor to ensure the reliability of the operation of the compressor. However, the low-voltage sensor or the low-voltage switch is configured, so that not only is the cost increased and the complexity of the pipeline layout increased, but also the risk of equipment damage is increased, and the stability of the air conditioner is reduced.
Disclosure of Invention
The problem that this application will improve is that the method that the multi-connected air conditioner of correlation technique obtained the suction side pressure of compressor is complicated, the poor problem of stability.
In order to improve the above problem, in a first aspect, the present application provides a suction side pressure determining method for determining a suction side pressure of a compressor of a multi-split air conditioner in a cooling mode, the suction side pressure determining method including:
determining the side pressure of an inner coil according to the temperature of the inner coil of the running indoor unit;
determining pressure loss according to the frequency of the compressor and the total capacity of the indoor unit in operation;
the suction side pressure is obtained by subtracting the pressure loss from the inner disc side pressure.
The method for determining the suction side pressure is used for determining the suction side pressure of the compressor in the refrigeration mode. In the case of refrigeration, gaseous refrigerant flows from the inner coil to the suction side of the compressor, so the suction side pressure of the compressor can be obtained by determining the inner coil side pressure and the on-way loss of the refrigerant in the conveying process and subtracting the two pressures. Because the temperature of the inner coil can reflect the pressure of the inner disc to a certain degree, the pressure of the inner disc can be determined according to the temperature of the inner coil. The pressure loss of the refrigerant is related to the length and the pipe diameter of a connecting pipe from the indoor unit to the outdoor unit, and is also related to the flow velocity of the refrigerant; the length and diameter of the connecting pipe are often related to the capacity of the indoor unit, and the flow rate of the refrigerant is related to the frequency of the compressor. Therefore, the pressure loss of the refrigerant can be determined by the total capacity of the indoor unit in operation and the compressor frequency. The suction side pressure of the compressor can be calculated after the inner disc side pressure and the pressure loss are determined. The method for acquiring the suction side pressure of the compressor can avoid using a low-pressure sensor or a low-pressure switch, reduce the cost, reduce the complexity of the pipeline layout and the risk of equipment failure during operation, and improve the stability of the whole multi-split air conditioner.
In an alternative embodiment, the step of determining the inner coil side pressure based on the inner coil temperature of the operating indoor unit includes:
acquiring the temperature of an inner coil of each running indoor unit;
and determining the side pressure of the inner coil according to the lowest temperature of the inner coil.
In an alternative embodiment, the step of determining the inner coil side pressure based on the lowest inner coil temperature comprises:
and determining the side pressure of the inner disc according to the lowest temperature of the inner coil and the corresponding relation between the pre-stored temperature of the inner coil and the side pressure of the inner disc.
In this embodiment, the correspondence between the temperature of the internal coil and the pressure of the internal coil may be stored in the storage medium in advance, and recalled when it is necessary to determine the pressure of the internal coil. The correspondence may be obtained through a number of tests.
In an alternative embodiment, in the step of determining the pressure loss according to the frequency of the compressor and the total capacity of the indoor unit in operation, the pressure loss satisfies the formula:
wherein, Δ PcFor pressure loss, FcIs the current frequency, Q, of the compressorcFor the total capacity of the operating indoor unit, k1、k2、k3Is a preset correction coefficient.
In the embodiment, the pressure loss is positively correlated with the square of the flow velocity of the refrigerant, and is positively correlated with the ratio of the length of the connecting pipe to the pipe diameter; the refrigerant flow rate is positively correlated with the compressor frequency, and the ratio of the length to the pipe diameter of the connecting pipe is positively correlated with the total capacity of the indoor unit in operation, so that the pressure loss formula contains
And k2×Qc. In this embodiment, k may be paired according to the length of the connecting pipe actually installed3Corrections are made to differentiate between different usage scenarios to make the calculation of pressure loss and inspiratory pressure more accurate.
In a second aspect, the present application provides an air conditioner control method applied to a multi-split air conditioner, the air conditioner control method including:
determining the air suction side pressure of a compressor of the multi-split air conditioner in a refrigeration mode by using the air suction side pressure determination method in any one of the preceding embodiments;
the frequency of the compressor is controlled based on the suction side pressure.
In this embodiment, since the method for determining the suction side pressure provided by the first aspect is adopted, a pressure sensor or a pressure switch is not required to be installed, the cost and the complexity of the pipeline layout are reduced, and the stability of the whole air conditioner is improved.
In an alternative embodiment, the step of controlling the frequency of the compressor based on the suction side pressure comprises:
in case the suction side pressure is less than a first preset pressure, the frequency of the compressor is limited.
When the suction-side pressure is lower than the first preset pressure, this means that the suction-side pressure is too low, and the operation frequency of the compressor needs to be limited.
In an alternative embodiment, the step of limiting the frequency of the compressor in case the suction side pressure is lower than a first preset pressure comprises:
under the condition that the pressure of the air suction side is smaller than a first preset pressure and not smaller than a second preset pressure, controlling the compressor to reduce the frequency or forbidding the compressor to increase the frequency;
and controlling the compressor to stop under the condition that the pressure of the suction side is less than a second preset pressure.
In the embodiment, the method for limiting the frequency of the compressor is divided into at least two methods, one is to control the compressor to only down-convert or prohibit the compressor from up-convert under the condition that the suction side pressure is slightly smaller but not smaller than the minimum (second preset pressure); another is that in the case where the suction side pressure is lower than the second preset pressure, at which time the suction side pressure of the compressor is considered to be already lower than the minimum, the continued operation increases the wear of the moving parts of the compressor, increasing the risk of failure thereof, and therefore the compressor needs to be protected, thus controlling the compressor to stop.
Optionally, the first preset pressure is set to be 150-300 kPa; the second preset pressure is set to be 50-150 kPa.
In an optional embodiment, the air conditioner control method further includes determining whether the multi-split air conditioner is in an unstable state or a stable state;
the first preset pressure and the second preset pressure respectively float up to preset values in an unsteady state compared with a value in a steady state.
In the embodiment, in consideration of the time delay of the temperature change relative to the pressure change, the actually calculated suction side pressure may lag behind the actual pressure, and when the multi-split air conditioner is in an unstable state, the calculated suction side pressure may deviate from the actual pressure, so that when the multi-split air conditioner is in the unstable state, the first preset pressure and the second preset pressure are adjusted upwards, the compressor is prevented from being in a risk state and is judged to be normal, and the compressor can be better protected.
Optionally, the preset value is set to be 100-300 kPa.
In an alternative embodiment, when the multi-split air conditioner satisfies any one of the following conditions, it is determined that the multi-split air conditioner is in an unstable state:
the compressor is started within a first preset time;
the total capacity change of the running indoor units exceeds a preset proportion and is within a second preset time after the change.
In the running process of the multi-split air conditioner, the multi-split air conditioner is in an unstable state in a period of time after the compressor is started and after the total capacity of the indoor unit is greatly changed. Optionally, the first preset time is set to be 5-20 min; the second preset time is set to be 5-20 min.
In an alternative embodiment, the step of controlling the frequency of the compressor based on the suction side pressure further comprises:
after limiting the frequency of the compressor, if the suction side pressure is greater than a third preset pressure and lasts for a third preset time, the limitation on the frequency of the compressor is removed;
wherein the third preset pressure is greater than the first preset pressure.
In this embodiment, after limiting the frequency of the compressor, if the suction side pressure returns to normal, the limitation should be removed in time so that the cooling effect of the indoor unit can meet the user's demand. The first preset pressure is an early warning value of the compressor suction side pressure, and the third preset pressure represents the normal level of the suction side pressure, so that the third preset pressure is greater than the first preset pressure.
In a third aspect, the present application provides a suction side pressure determining module for determining a suction side pressure of a compressor of a multi-split air conditioner in a cooling mode, wherein the suction side pressure determining module includes:
the inner coil side pressure acquisition unit is used for determining the inner coil side pressure according to the temperature of an inner coil of the running indoor unit;
a pressure loss obtaining unit for determining a pressure loss according to a frequency of the compressor and a total capacity of the indoor unit in operation;
and the air suction side pressure calculating unit is used for subtracting the pressure loss from the inner disk side pressure to obtain the air suction side pressure.
In a fourth aspect, the present application provides an air conditioner control device applied to a multi-split air conditioner, including:
the air suction side pressure determining module is used for determining the air suction side pressure of the compressor of the multi-split air conditioner in the refrigerating mode;
and the compressor control module is used for controlling the frequency of the compressor according to the suction side pressure.
In a fifth aspect, the present application provides a multi-split air conditioner including a controller for executing an executable program to implement the suction side pressure determining method of any one of the foregoing embodiments or the air conditioner controlling method of any one of the foregoing embodiments.
Drawings
Fig. 1 is a schematic structural view of a multi-split air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit control diagram of a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method of determining an inspiratory side pressure provided in an embodiment of the present application;
FIG. 4 is a flowchart illustrating an air conditioning control method according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an air conditioning control apparatus according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an intake side pressure determination module in accordance with an embodiment of the present application;
fig. 7 is a block diagram illustrating a multi-split air conditioner according to an embodiment of the present application.
Description of reference numerals: 010-multi-split air conditioner; 100-an outdoor unit; 110-an outer coil; 120-a compressor; a 130-four-way reversing valve; 140-connecting tube; 200-indoor unit; 210-an inner coil; 220-a temperature sensor; 230-a throttling device; 300-a controller; 400-bus; 500-a storage medium; 600-air conditioning control means; 610-an inspiratory side pressure determination module; 611-an inner disk side pressure obtaining unit; 612-a pressure loss acquisition unit; 613-suction side pressure calculation means; 620-compressor control module.
Detailed Description
In the related art multi-split air conditioner, a low-pressure sensor or a low-pressure switch is arranged on a suction side pipeline of a compressor to ensure the operation reliability of the compressor. However, when a low-voltage sensor or a low-voltage switch is arranged, holes and welding points need to be added on the pipeline of the outdoor unit, and a conduit (usually a thin copper pipe with the outer diameter of phi 6) is connected with the pipeline. Not only increased the complexity of pipeline layout, there is the risk of ftractureing in the pipe moreover, increases the uncertainty in air conditioner production, transportation, the use, in case the ftractureing then can cause the refrigerant not enough, seriously influences the normal use of air conditioner. Meanwhile, the pressure sensor or the pressure switch is provided with a wiring, and needs to be connected to a controller, so that a wire bundle for fixing a circuit, a clamping groove, an interface terminal of a control panel and the like can be added, the complexity of design and production of the air conditioner is increased, and the cost is increased.
Therefore, in order to improve the disadvantages of the air conditioners in the related art, embodiments of the present invention provide a suction side pressure determining method applied to a multi-split air conditioner, which is capable of determining a suction side pressure of a compressor in a cooling mode. The method for determining the air suction side pressure does not depend on a low-pressure sensor, so that the cost and the complexity of pipeline layout are reduced, the risk of equipment failure is reduced, and the stability of the multi-split air conditioner is improved. The embodiment of the application provides an air conditioner control method, and the frequency of a compressor is controlled according to the suction side pressure determined by the suction side pressure determination method provided by the application. In addition, the embodiment of the application also provides an air suction side pressure determining module, an air conditioner control device and a multi-split air conditioner.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below.
Fig. 1 is a schematic structural diagram of a multi-split air conditioner 010 according to an embodiment of the present disclosure; fig. 2 is a schematic circuit control diagram of the multi-split air conditioner 010 according to an embodiment of the present disclosure. As shown in fig. 1 and 2, the multi-split air conditioner 010 includes an outdoor unit 100 and a plurality of indoor units 200, the indoor units 200 and the outdoor unit 100 form a loop through a pipe, and the plurality of indoor units 200 are arranged in parallel. The outdoor unit 100 includes an outer coil 110 and a compressor 120, the indoor unit 200 includes an inner coil 210 and a temperature sensor 220 for detecting a temperature of the inner coil, and the inner coil 210 and the outer coil 110 form a loop through a pipe for circulating a refrigerant. In this embodiment, the multi-split air conditioner 010 further includes a four-way reversing valve 130 and a plurality of throttling devices 230, where the four-way reversing valve 130 is used to switch the flow direction of a refrigerant in a pipeline to switch a cooling or heating mode; each throttling device 230 is disposed on a branch line of each indoor unit 200 in a one-to-one correspondence manner, and is used for converting a high-pressure liquid refrigerant into a low-pressure liquid refrigerant. The solid arrows on the lines shown in fig. 1 indicate the flow direction of the refrigerant in the cooling mode of the multi-split air conditioner 010, and in the cooling mode, the refrigerant absorbs heat in the inner coil 210 and is gasified into low-pressure gas, and then flows to the compressor 120 through the connection pipe 140. The refrigerant inlet of the compressor 120 is a suction side, and the pressure of the suction side is lower than that of the refrigerant outlet of the compressor 120. The compressor 120 of the multi-split air conditioner 010 and the temperature sensor 220 corresponding to each indoor unit 200 are electrically connected to the controller 300.
FIG. 3 is a flow chart of a method of determining an inspiratory side pressure provided in an embodiment of the present application. As shown in fig. 3, the inspiratory side pressure determination method includes:
and step S110, determining the pressure of the inner coil side according to the temperature of the inner coil of the running indoor unit.
Taking the multi-split air conditioner 010 provided in the embodiment of the present application as an example, the controller 300 may detect or determine which indoor units 200 are in an operating state according to a user instruction. It should be noted that the indoor unit 200 in operation herein shall mean the indoor unit 200 operating in the cooling mode. When each operating indoor unit 200 is determined, the temperature of the inner coil of the operating indoor unit 200 is detected by the corresponding temperature sensor 220, and the pressure of the connection pipe 140 on the side close to the indoor unit 200 is determined according to the temperature of the inner coil. It can be understood that since the gaseous refrigerant flows from the indoor unit 200 side to the suction side of the compressor 120 through the connection pipe 140, the pressure on the suction side of the compressor 120 can be calculated by obtaining the pressure on the indoor unit 200 side and the pressure loss of the refrigerant during the transportation process through the connection pipe 140.
Specifically, each indoor unit 200 is connected in parallel, and in this embodiment, the step S100 specifically includes: acquiring the temperature of the inner coil of each running indoor unit 200; and determining the side pressure of the inner coil according to the lowest temperature of the inner coil. Alternatively, the correspondence between the inner coil temperature and the inner disc side pressure may be pre-stored in the storage medium 500 and recalled by the controller 300 when it is desired to determine the inner disc side pressure. The correspondence may be obtained through a number of experimental tests.
And step S120, determining pressure loss according to the frequency of the compressor and the total capacity of the indoor unit in operation.
Taking the multi-split air conditioner 010 provided in the embodiment of the present application as an example, the controller 300 obtains the frequency of the compressor 120, and calculates the pressure loss of the refrigerant during the transmission process of the connection pipe 140 according to the frequency of the compressor 120 and the total capacity of the operating indoor unit 200.
Specifically, the pressure loss satisfies the formula:
wherein, Δ PcFor pressure loss, FcIs the current frequency, Q, of the compressor 120cIs the total capacity, k, of the operating indoor unit 2001、k2、k3Is a preset correction coefficient.
In the embodiment, the pressure loss is positively correlated with the square of the flow velocity of the refrigerant, and is positively correlated with the ratio of the length of the connecting pipe 140 to the pipe diameter, and the pressure loss and the connecting pipe exhibit a certain functional relationship. The refrigerant flow rate is positively correlated to the frequency of the compressor 120, and the ratio of the length to the diameter of the connection pipe 140 is positively correlated to the total capacity of the operating indoor unit 200, and there is a corresponding mapping relationship between them. The pressure loss can be determined by the frequency of the compressor 120 and the total capacity of the indoor unit 200 in operation, and therefore the pressure loss formula in this embodiment includes
And k2×QcThese two terms. In this embodiment, k may be set according to the length of the connection pipe 140 actually installed3Corrections are made to differentiate between different usage scenarios to make the calculation of pressure loss and inspiratory pressure more accurate. k is a radical of1、k2、k3Etc. may be obtained through a number of experiments and pre-stored in the storage medium 500.
It should be understood that the execution sequence of step S100 and step S200 is not limited, and the sequence of the two steps may be reversed or performed simultaneously.
In step S130, the suction-side pressure is obtained by subtracting the pressure loss from the inner-disc-side pressure.
In the embodiment of the present application, when the inner disk side pressure and the pressure loss are determined, the suction side pressure of the compressor 120 is obtained by subtracting the pressure loss from the inner disk side pressure.
In the method for determining the suction side pressure provided by the embodiment of the application, the suction side pressure of the compressor 120 can be obtained by determining the inner disk side pressure and the on-way loss of the refrigerant in the conveying process and subtracting the inner disk side pressure and the refrigerant. By obtaining the suction side pressure of the compressor 120 through the method, the use of a low-pressure sensor or a low-pressure switch can be avoided, the assembly cost of the multi-split air conditioner 010 is reduced, the complexity of the pipeline layout and the risk of faults such as cracking and leakage of the pipeline are reduced, and the stability of the whole multi-split air conditioner 010 is improved.
It will be appreciated that the suction side pressure of the compressor 120 needs to be maintained within a reasonable range to ensure reliability of operation of the compressor 120. Generally, the operation state of the compressor 120 is determined by acquiring the suction side pressure of the compressor 120, and the compressor 120 is adjusted according to the suction side pressure to prevent it from being damaged. Of course, the suction-side pressure of the compressor 120 may be used as a basis for other judgment and control. Next, an air conditioner control method is provided, which controls the compressor 120 based on the suction side pressure determined by the suction side pressure determination method provided in the above embodiment of the present application.
Fig. 4 is a flowchart illustrating an air conditioner control method according to an embodiment of the present disclosure. As shown in fig. 4, the air conditioner control method includes:
and step S100, determining the air suction side pressure of the compressor of the multi-split air conditioner in the refrigeration mode.
The specific implementation manner of this step may refer to steps S110 to S130 of the suction side pressure determination method provided in the above embodiment of the present application, and details are not described here.
In step S200, the frequency of the compressor is controlled according to the suction-side pressure.
Since the suction side pressure of the compressor 120 can reflect the operation state of the compressor 120 to some extent, the frequency of the compressor 120 can be controlled according to the suction side pressure to protect the reliability of the operation of the compressor 120. In the air conditioner control method, because the air suction side pressure determining method provided by the embodiment is adopted, a pressure sensor or a pressure switch is avoided, the cost and the complexity of the pipeline layout are reduced, and the stability of the whole air conditioner is improved.
Specifically, the step of controlling the frequency of the compressor 120 according to the suction side pressure in step S200 may include: in the case where the suction side pressure is less than the first preset pressure, the frequency of the compressor 120 is limited. When the suction-side pressure is lower than the first preset pressure, it means that the suction-side pressure is too low at this time, and the operation frequency of the compressor 120 needs to be limited.
In this embodiment, the operating frequency of the compressor 120 is optionally limited, including controlling the compressor 120 to down-frequency, prohibiting the compressor 120 from up-frequency, or controlling the compressor 120 to stop (i.e., frequency down to zero). In an alternative embodiment, the step of limiting the frequency of the compressor 120 in case the suction side pressure is less than the first preset pressure may comprise:
controlling the compressor 120 to reduce the frequency or prohibiting the compressor 120 from increasing the frequency under the condition that the suction side pressure is less than the first preset pressure and not less than the second preset pressure;
in case that the suction side pressure is less than the second preset pressure, the compressor 120 is controlled to be stopped.
In the present embodiment, the method for limiting the frequency of the compressor 120 is divided into two categories, one is to control only the compressor 120 to down-convert or prohibit the compressor 120 from up-converting when the suction-side pressure is slightly lower but not yet lower than the minimum (the second preset pressure); another is in the case where the suction side pressure is lower than the second preset pressure, at which time the suction side pressure of the compressor 120 is considered to be lower than the minimum, and the continued operation increases the wear of the moving parts of the compressor 120, increasing the risk of failure thereof, and therefore the compressor 120 needs to be protected, and the compressor 120 is controlled to stop.
Thus, the first preset pressure can be regarded as a warning value and the second preset pressure as a limit value. Optionally, the first preset pressure is set to be 150-300 kPa; the second preset pressure is set to be 50-150 kPa, and the second preset pressure is ensured to be smaller than the first preset pressure.
In an optional embodiment, the air conditioner control method further includes determining whether the multi-split air conditioner 010 is in an unstable state or a stable state; the first preset pressure and the second preset pressure respectively float up to preset values in an unsteady state compared with a value in a steady state.
In this embodiment, in consideration of the time delay of the temperature change with respect to the pressure change, the actually calculated suction side pressure may lag behind the actual pressure, and when the multi-split air conditioner 010 is in the unstable state, the calculated suction side pressure may deviate (is often larger) from the actual pressure, so that when the multi-split air conditioner 010 is in the unstable state, the first preset pressure and the second preset pressure are adjusted upward, and it is avoided that the compressor 120 is determined to be normal when the compressor 120 is already in the risk state, so that the compressor 120 can be better protected. Optionally, the preset value is set to be 100-300 kPa.
Optionally, when the multi-split air conditioner 010 meets any one of the following conditions, it is determined that the multi-split air conditioner 010 is in an unstable state:
within a first preset time period after the compressor 120 is started;
the total capacity change of the operating indoor unit 200 exceeds the preset ratio and is within the second preset time after the change.
In the operation process of the multi-split air conditioner 010, the multi-split air conditioner 010 is in an unstable state for a period of time after the compressor 120 is started and for a period of time after the total capacity of the indoor unit 200 is greatly changed. Optionally, the first preset time is set to be 5-20 min; the second preset time is set to be 5-20 min; the preset proportion can be selected to be 20-50%.
Optionally, after limiting the frequency of the compressor 120, if the suction-side pressure is greater than a third preset pressure for a third preset time period, the limitation on the frequency of the compressor 120 is removed; wherein the third preset pressure is greater than the first preset pressure.
In the present embodiment, after limiting the frequency of the compressor 120, if the suction side pressure returns to normal, the limitation should be removed in time so that the cooling effect of the indoor unit 200 can satisfy the user's demand. Specifically, the releasing of the limit on the frequency of the compressor 120 includes no longer prohibiting the compressor 120 from increasing the frequency, controlling the compressor 120 to normally operate, and for the compressor 120 that has been controlled to stop (stop due to the suction side pressure being lower than the second preset pressure), the releasing of the limit on the frequency of the compressor 120 is to restart the compressor 120. Since the first preset pressure is an early warning value of the suction side pressure of the compressor 120, and the third preset pressure represents a normal level of the suction side pressure, the third preset pressure is greater than the first preset pressure. Optionally, the third preset pressure is 300-600 kPa. Of course, when the multi-split air conditioner 010 is in an unstable state, the value of the third preset pressure may also be increased by a preset value as compared with that in a stable state.
Fig. 5 is a schematic diagram of an air conditioning control apparatus 600 according to an embodiment of the present application. As shown in fig. 5, air conditioning control apparatus 600 includes:
a suction side pressure determining module 610 for determining a suction side pressure of the compressor 120 of the multi-split air conditioner 010 in the cooling mode;
and a compressor control module 620 for controlling the frequency of the compressor 120 according to the suction side pressure.
The implementation of the corresponding functions of the above modules can be referred to the descriptions of the suction side pressure determining method and the air conditioner control method in the foregoing embodiments.
FIG. 6 is a schematic diagram of an inspiratory side pressure determination module 610 in one embodiment of the present application. As shown in fig. 6, the inspiratory side pressure determination module 610 includes:
an inner coil side pressure obtaining unit 611 for determining an inner coil side pressure according to an inner coil temperature of the operating indoor unit 200;
a pressure loss obtaining unit 612 for determining a pressure loss according to the frequency of the compressor 120 and the total capacity of the indoor unit 200 in operation;
a suction side pressure calculation unit 613 for obtaining the suction side pressure by subtracting the pressure loss from the inner disk side pressure.
The implementation of the corresponding functions of the above units can be referred to the description of steps S110 to S130 of the suction side pressure determining method in the foregoing embodiment.
It should be understood that the above modules and units may be executable computer programs for implementing corresponding functions, which can be stored in the storage medium 500 and called and executed by the controller 300 to implement the corresponding functions.
Fig. 7 is a schematic block diagram of a multi-split air conditioner 010 according to an embodiment of the present disclosure. As shown in fig. 7, the multi-split air conditioner 010 of the embodiment of the present application further includes a storage medium 500 and a bus 400, and the controller 300 is connected to the storage medium 500 through the bus 400.
The controller 300 may be an integrated circuit chip having signal processing capabilities. The controller 300 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps, and flowchart disclosed in the embodiments of the present invention may be implemented or performed.
The storage medium 500 stores a program, such as an air conditioning control device 600 shown in fig. 5. The air conditioner control device 600 includes at least one software function module that may be stored in the storage medium 500 in the form of software or firmware (firmware) or solidified in the operating system of the multi-split air conditioner 010, and the controller 300 executes the above program to implement the air conditioner control method disclosed in the above embodiment after receiving the execution instruction. The storage medium 500 may be in the form of a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or any other medium capable of storing program codes. In alternative embodiments, the storage medium 500 may be integrated with the controller 300, for example, the storage medium 500 may be integrated with the controller 300 in a chip.
While the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.
Claims (12)
1. A suction side pressure determining method for determining a suction side pressure of a compressor (120) of a multi-split air conditioner (010) in a cooling mode, the suction side pressure determining method comprising:
determining the side pressure of an inner coil (210) according to the temperature of the inner coil (210) of the running indoor unit (200);
determining a pressure loss according to a frequency of a compressor (120), a total capacity of the operating indoor unit (200);
subtracting the pressure loss from the inner disk side pressure to obtain the suction side pressure;
in the step of determining the pressure loss according to the frequency of the compressor (120) and the total capacity of the operating indoor unit (200), the pressure loss satisfies the formula:
ΔPc＝k1×Fc 2+k2×Qc+k3；
wherein, Δ PcFor said pressure loss, FcIs the current frequency, Q, of the compressor (120)cIs the total capacity, k, of the operating indoor unit (200)1、k2、k3Is a preset correction coefficient.
2. The suction side pressure determining method as set forth in claim 1, wherein the step of determining the inner coil side pressure based on the temperature of the inner coil (210) of the indoor unit (200) in operation comprises:
acquiring the temperature of an inner coil (210) of each running indoor unit (200);
-determining the inner coil side pressure based on the lowest inner coil (210) temperature.
3. The method of determining suction side pressure according to claim 2 wherein the step of determining the inner coil side pressure based on the lowest temperature of the inner coil (210) comprises:
and determining the pressure at the inner disc side according to the lowest temperature of the inner coil (210) and the pre-stored corresponding relation between the temperature of the inner coil (210) and the pressure at the inner disc side.
4. An air conditioner control method is applied to a multi-split air conditioner (010), and is characterized by comprising the following steps:
determining a suction side pressure of a compressor (120) of the multi-split air conditioner (010) in a cooling mode by the suction side pressure determination method of any one of claims 1 to 3;
controlling a frequency of the compressor (120) based on the suction side pressure.
5. The air conditioning control method according to claim 4, wherein the step of controlling the frequency of the compressor (120) according to the suction side pressure includes:
limiting the frequency of the compressor (120) in case the suction side pressure is less than a first preset pressure.
6. The air conditioning control method according to claim 5, wherein the step of limiting the frequency of the compressor (120) in the case where the suction side pressure is less than a first preset pressure comprises:
controlling the compressor (120) to reduce the frequency or prohibiting the compressor (120) to increase the frequency under the condition that the suction side pressure is smaller than the first preset pressure and not smaller than a second preset pressure;
and controlling the compressor (120) to stop when the suction side pressure is smaller than the second preset pressure.
7. The air conditioning control method according to claim 6, further comprising determining whether the multi-split air conditioner (010) is in an unsteady state or a steady state;
the first preset pressure and the second preset pressure respectively float up to preset values in the non-steady state compared with the steady state.
8. The air-conditioning control method according to claim 7, wherein it is determined that the multi-split air conditioner (010) is in the unstable state if the multi-split air conditioner (010) satisfies any one of the following conditions:
within a first preset time period after the compressor (120) is started;
the total capacity change of the running indoor unit (200) exceeds a preset proportion and is within a second preset time after the change.
9. The air conditioning control method according to claim 5, wherein the step of controlling the frequency of the compressor (120) according to the suction side pressure further includes:
after limiting the frequency of the compressor (120), if the suction side pressure is greater than a third preset pressure for a third preset time period, removing the limitation on the frequency of the compressor (120);
wherein the third preset pressure is greater than the first preset pressure.
10. A suction side pressure determination module for determining a suction side pressure of a compressor (120) of a multi-split air conditioner (010) in a cooling mode, wherein the suction side pressure determination module (610) comprises:
an inner coil side pressure acquisition unit (611) for determining an inner coil side pressure according to a temperature of an inner coil (210) of an operating indoor unit (200);
a pressure loss acquisition unit (612) for determining a pressure loss according to a frequency of a compressor (120), a total capacity of the operating indoor unit (200);
a suction side pressure calculation unit (613) for subtracting the pressure loss from the inner disc side pressure to obtain the suction side pressure;
in the step of determining the pressure loss according to the frequency of the compressor (120) and the total capacity of the operating indoor unit (200), the pressure loss satisfies the formula:
wherein, Δ PcFor said pressure loss, FcIs the current frequency, Q, of the compressor (120)cIs the total capacity, k, of the operating indoor unit (200)1、k2、k3Is a preset correction coefficient.
11. An air conditioner control device is applied to a multi-split air conditioner (010), and is characterized by comprising:
the suction side pressure determination module (610) of claim 10, configured to determine a suction side pressure of a compressor (120) of the multi-split air conditioner (010) in a cooling mode;
a compressor control module (620) for controlling a frequency of the compressor (120) based on the suction side pressure.
12. A multi-split air conditioner characterized by comprising a controller (300), the controller (300) being configured to execute an executable program to implement the suction side pressure determination method of any one of claims 1 to 3 or the air conditioner control method of any one of claims 4 to 9.
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| JPH1114125A (en) * | 1997-06-20 | 1999-01-22 | Matsushita Refrig Co Ltd | Multichamber type air conditioner |
| JP2005009794A (en) * | 2003-06-20 | 2005-01-13 | Sanden Corp | Freezing cycle control device |
| JP4711706B2 (en) * | 2005-03-18 | 2011-06-29 | 三菱電機株式会社 | Air conditioner |
| CN105466093B (en) * | 2015-11-17 | 2017-12-19 | 广东美的制冷设备有限公司 | The pressure at expulsion of compressor and the virtual detection method and device of back pressure |
| CN107270601B (en) * | 2017-07-07 | 2020-06-16 | 青岛海尔空调电子有限公司 | Control method of water chilling unit |
| CN108397375B (en) * | 2018-02-07 | 2019-12-20 | 广东美的暖通设备有限公司 | Compressor control method, air conditioner and storage medium |
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Effective date of registration: 20221018 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |