CN109210737B - Variable frequency air conditioner and variable frequency method thereof - Google Patents
Variable frequency air conditioner and variable frequency method thereof Download PDFInfo
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- CN109210737B CN109210737B CN201811081287.XA CN201811081287A CN109210737B CN 109210737 B CN109210737 B CN 109210737B CN 201811081287 A CN201811081287 A CN 201811081287A CN 109210737 B CN109210737 B CN 109210737B
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- 238000006243 chemical reaction Methods 0.000 description 12
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- 238000001816 cooling Methods 0.000 description 2
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Classifications
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides a variable frequency air conditioner and a variable frequency method thereof, wherein the variable frequency air conditioner comprises an indoor unit and an outdoor unit, the indoor unit comprises an indoor circuit board, the outdoor unit comprises a compressor, an external fan, a reversing device and a variable frequency driver, and the indoor circuit board is connected with the variable frequency driver, the external fan and the reversing device and used for controlling the working states of the variable frequency driver, the external fan and the reversing device; the output end of the variable frequency driver is connected with the compressor and used for controlling the working state of the compressor, so that the cost of the variable frequency air conditioner can be reduced by adopting the low-power variable frequency driver, or the cost of the variable frequency air conditioner can be reduced by not adopting a communication circuit.
Description
The present application claims priority from the chinese patent office, application number 201810644413.1, and chinese patent application entitled "variable frequency air conditioner and method for variable frequency" filed on 21/06/2018, the entire contents of which are incorporated herein by reference.
Technical Field
The application relates to the technical field of air conditioners, in particular to a variable frequency air conditioner and a variable frequency method thereof.
Background
Along with the deterioration of ecological environment, people's energy-saving consciousness is gradually improved, and in the air conditioner market, the frequency conversion air conditioner duty ratio is improved year by year. However, since the price of the variable frequency air conditioner is generally high, some users still select the fixed frequency air conditioner with low price. Based on this, how to reduce the cost of the variable frequency air conditioner is one of the problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present application provides a variable frequency air conditioner and a variable frequency method thereof, so as to reduce the cost of the variable frequency air conditioner.
In order to achieve the above purpose, the present application provides the following technical solutions:
the variable frequency air conditioner comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor circuit board, the outdoor unit comprises a compressor, an external fan and a reversing device, and the outdoor unit further comprises a variable frequency driver;
the indoor circuit board is connected with the variable frequency driver, the external fan and the reversing device and used for controlling the working states of the variable frequency driver, the external fan and the reversing device;
the indoor circuit board comprises a first control output end, a second control output end and a third control output end;
the first control output end is connected with the variable frequency driver and used for controlling the working state of the variable frequency driver;
the second control output end is connected with the external fan and used for controlling the working state of the external fan;
the third control output end is connected with the reversing device and is used for controlling the working state of the reversing device;
the variable frequency driver is connected with the compressor and used for controlling the working state of the compressor;
when the variable frequency driver and the compressor are in an on state, the variable frequency driver adjusts the output frequency of the variable frequency driver according to information of preset parameters, and controls the running frequency of the compressor.
Optionally, the second control output terminal and the third control output terminal are connected to the external fan and the reversing device respectively through a power circuit, and the power circuit comprises a driving capacitor.
Optionally, the preset parameters include:
and one or more of a difference between the indoor temperature and the set temperature, an operation parameter of the compressor and an operation parameter of the variable frequency air conditioner.
Optionally, the difference between the indoor temperature and the set temperature is related to the first time opening duration of the variable frequency drive;
the operating parameters of the compressor include an operating time of the compressor, an electromagnetic torque, or a discharge temperature;
the working parameters of the variable frequency air conditioner comprise power, current or voltage.
A control method of a variable frequency air conditioner, applied to the variable frequency air conditioner described in any one of the above, comprising:
the indoor circuit board controls the working states of the variable frequency driver, the external fan and the reversing device;
the indoor circuit board comprises a first control output end, a second control output end and a third control output end;
the first control output end is connected with the variable frequency driver and used for controlling the working state of the variable frequency driver;
the second control output end is connected with the external fan and used for controlling the working state of the external fan;
the third control output end is connected with the reversing device and used for controlling the working state of the reversing device;
the variable frequency driver controls the working state of the compressor;
when the variable frequency driver and the compressor are in an on state, the variable frequency driver adjusts the output frequency of the variable frequency driver according to information of preset parameters, and controls the running frequency of the compressor.
Optionally, the variable frequency driver adjusts its own output frequency according to information of preset parameters, and controlling the operation frequency of the compressor includes:
the variable frequency driver adjusts the output frequency of the variable frequency driver according to the first starting time length of the variable frequency driver when the variable frequency air conditioner is started, and controls the running frequency of the compressor;
wherein the first opening duration is related to a difference between the indoor temperature and the set temperature.
Optionally, the variable frequency driver adjusts its own output frequency according to information of preset parameters, and controlling the operation frequency of the compressor includes:
the variable frequency driver judges whether the running time of the compressor at the same frequency is longer than a preset time;
if so, judging whether the operating frequency of the compressor is the maximum frequency, if not, adjusting the output frequency of the compressor, and controlling the operating frequency of the compressor to be larger than the current frequency of the compressor.
Optionally, the variable frequency driver adjusts its own output frequency according to information of preset parameters, and controlling the operation frequency of the compressor includes:
the variable frequency driver judges whether the electromagnetic torque of the compressor is larger than an electromagnetic torque limit value corresponding to the current frequency of the compressor;
if so, judging whether the operating frequency of the compressor is the minimum frequency, if not, adjusting the output frequency of the compressor, and controlling the operating frequency of the compressor to be smaller than the current frequency of the compressor.
Optionally, the variable frequency driver adjusts its own output frequency according to information of preset parameters, and controlling the operation frequency of the compressor includes:
the variable frequency driver judges whether the exhaust temperature of the compressor is higher than a preset temperature;
the technical scheme provided by the application has the following advantages:
according to the variable frequency air conditioner and the variable frequency method thereof, the working states of the variable frequency driver, the external fan and the reversing device are controlled through the indoor circuit board, and the working states of the compressor are controlled through the variable frequency driver, so that the cost of the variable frequency air conditioner can be reduced through adopting the low-power variable frequency driver, and/or the cost of the variable frequency air conditioner is reduced through not adopting a communication circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a variable frequency air conditioner according to an embodiment of the present application;
fig. 2 is a flowchart of a frequency conversion method of a frequency conversion air conditioner according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a variable frequency air conditioner, as shown in fig. 1, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor circuit board 10, and the outdoor unit comprises a variable frequency driver 20, a compressor 21, an external fan 22 and a reversing device 23. Of course, the indoor unit further includes components such as an indoor heat exchanger, and the outdoor unit further includes components such as an outdoor heat exchanger, which are not described herein.
The reversing device 23 is usually a four-way valve, that is, the reversing device 23 of the present application may be a four-way valve, but the present application is not limited thereto, that is, the specific form of the reversing device 23 is not limited thereto.
In this embodiment, the variable frequency drive 20, the outdoor fan 22 and the reversing device 23 in the outdoor unit are all connected to the indoor circuit board 10, and the compressor 21 is connected to the variable frequency drive 20. The indoor circuit board 10 is used for controlling the working states of the variable frequency drive 20, the external fan 22 and the reversing device 23, such as controlling the opening of the variable frequency drive 20, the external fan 22 and the reversing device 23, controlling the closing of the variable frequency drive 20, the external fan 22 and the reversing device 23, controlling the working frequency when the external fan 22 is opened, controlling the opening state of the reversing device 23, etc.; the inverter driver 20 is used to control an operation state of the compressor 21, such as to control the on/off of the compressor 21, to control the operation frequency of the compressor 21, etc., so that the cost of the inverter air conditioner can be reduced by using a low-power inverter driver, and/or the cost of the inverter air conditioner can be reduced by not using a communication circuit.
In this embodiment, when the variable frequency drive 20 and the compressor 21 are in the on state, the variable frequency drive 20 can adjust its own output frequency according to the information of the preset parameters, so as to control the operation frequency of the compressor 21 by adjusting its own output power. That is, when the variable frequency drive 20 and the compressor 21 are in the on state, the variable frequency drive 20 may adjust its own output frequency according to information of preset parameters to control the operation frequency of the compressor 21. Based on this, the indoor unit and the outdoor unit do not adopt a communication circuit, and control of the operation frequency of the compressor can be realized, so that the cost of the variable frequency air conditioner can be reduced by not adopting a communication circuit.
In addition, since the variable frequency driver 20 in the embodiment of the present application only needs to control the working state of the compressor 21, it is no longer necessary to control the working states of the external fan 22 and the reversing device 23, and therefore, it is no longer necessary to drive the external fan 22 and the reversing device 23 by using the high-power variable frequency driver 20 (switch circuit), so that the cost of the variable frequency air conditioner can be reduced by using the low-power variable frequency driver 20.
In addition, because the existing fixed-frequency air conditioner also adopts a mode that an indoor circuit board directly controls the working states of an external fan and a reversing device, a variable frequency driver can be added on the basis of the existing fixed-frequency air conditioner, and the working states of a compressor are controlled through the variable frequency driver, so that the scheme of the application is realized, that is, the external fan and the reversing device can directly control the switching of the external fan and the reversing device along the control mode of the fixed-frequency air conditioner, namely, the indoor circuit board still supplies power to the indoor circuit board of the fixed-frequency air conditioner, the newly added variable frequency driver only needs to control the working states of the compressor, and the variable frequency effect is realized by controlling the working frequency of the compressor through the variable frequency driver according to the information of preset parameters, so that the related components of the outdoor unit of the existing fixed-frequency air conditioner can be directly replaced to convert the fixed-frequency air conditioner into the variable frequency air conditioner, the variable frequency air conditioner is low in conversion cost, and energy and electricity-saving.
It should be noted that, in the present application, the cost of the variable frequency air conditioner can be reduced only by using a low-power variable frequency driver, or the cost of the variable frequency air conditioner can be reduced only by not using a communication circuit, or the cost of the variable frequency air conditioner can be reduced by using a low-power variable frequency driver, or the cost of the variable frequency air conditioner can be reduced by not using a communication circuit.
The working states of the variable frequency driver 20, the external fan 22 and the reversing device 23 can be independently controlled by the indoor circuit board 10, or can be separately controlled, and the application is not limited to the above. Specifically, when the scheme of the application is adopted to improve the fixed-frequency air conditioner, the control mode of the indoor circuit board 10 on the working states of the external fan 22 and the reversing device 23 is preferably the same as that of the original fixed-frequency air conditioner.
In one embodiment of the present application, the indoor circuit board 10 includes a first control output, a second control output, and a third control output; the first control output end is connected with the variable frequency driver 20 and is used for controlling the working state of the variable frequency driver 20; the second control output end is connected with the external fan 22 and is used for controlling the working state of the external fan 22; the third control output is connected to the reversing device 23 for controlling the operating state of the reversing device 23. Optionally, the second control output and the third control output are connected to the external fan 22 and the reversing device 23, respectively, via a power circuit, further the power circuit comprising a driving capacitor.
It should be noted that the structure of the variable frequency air conditioner in this embodiment is basically the same as that of the conventional fixed frequency air conditioner, and the only difference is that the variable frequency air conditioner in this embodiment is added with a variable frequency driver 20, and the compressor 21 is not directly connected to the indoor circuit board 10 any more, but is connected to the indoor circuit board 10 through the variable frequency driver 20. That is, in the present embodiment, the operation state of the compressor 21 is no longer determined by the indoor circuit board 10, but the operation state of the variable frequency drive 20 is controlled by the indoor circuit board 10, and the operation state and the operation frequency of the compressor 21 are controlled by the variable frequency drive 20.
Further, the structure of the variable frequency driver 20 in this embodiment is the same as the principle of the variable frequency driver 20 of the existing variable frequency air conditioner, that is, the output frequency is controllable and variable according to the control signal, and the output signal can be used as the input signal of the compressor of the variable frequency air conditioner, so as to realize the variable frequency control of the compressor. When the indoor temperature of the indoor unit reaches the set temperature, the indoor circuit board 10 controls the variable frequency driver 20 to be turned off. The difference is that the variable frequency driver 20 of the existing variable frequency air conditioner controls the operation frequency of the compressor 21 according to the information of the indoor temperature, the set temperature and the like received by the indoor circuit board, and the variable frequency driver 20 in the present application controls the operation frequency of the compressor 21 according to the information of the pre-set parameters stored in advance.
Specifically, in this embodiment, the preset parameters include: one or more of a difference between the indoor temperature and the set temperature, an operation parameter of the compressor 21, and an operation parameter of the inverter air conditioner.
Further, in the present embodiment, the difference between the indoor temperature and the set temperature is related to the first time of the variable frequency drive 20. When the variable frequency air conditioner is started, the indoor circuit board 10 controls the variable frequency driver 20 to be turned on and off once, namely controls the variable frequency driver 20 to be turned on, and controls the variable frequency driver 20 to be turned off after a certain time interval, so that the difference between the indoor temperature and the set temperature is transmitted to the variable frequency driver 20. And finally, formally controlling the variable frequency drive 20 to be started for normal operation.
In this embodiment, the correspondence between the difference between the indoor temperature and the set temperature and the first time on period of the variable frequency drive 20 is preset, for example, the longer the on period of the variable frequency drive 20 is, the larger the difference between the indoor temperature and the set temperature is. Further, when the difference between the indoor temperature and the set temperature is large, the variable frequency driver 20 controls the compressor 21 to operate at a large frequency to achieve rapid cooling, and when the difference between the indoor temperature and the set temperature is small, the variable frequency driver 20 controls the compressor 21 to operate at a small frequency to achieve the energy saving effect.
In the present embodiment, the variable frequency drive 20 does not need to receive the indoor temperature and the set temperature, and thus a communication circuit is not required. The control of the operating frequency of the compressor 21 is realized by controlling the opening time of the variable frequency driver 20 only through the indoor circuit board 10, realizing the simulation of the difference between the indoor temperature and the set temperature, and controlling the output frequency of the variable frequency driver 20 during normal operation according to the first opening time. Of course, the present application is not limited thereto, and in other embodiments, the information of the difference between the indoor temperature and the set temperature may be transmitted to the variable frequency drive 20 by setting the difference between the indoor temperature and the set temperature to be smaller as the on period of the variable frequency drive 20 is longer.
In another embodiment, the operating parameters of the compressor 21 include an operating time of the compressor 21, an electromagnetic torque, or a discharge temperature. That is, the variable frequency drive 20 adjusts its own output frequency according to information of preset parameters to control the operation frequency of the compressor 21 includes: the variable frequency drive 20 controls the operating frequency of the compressor 21 according to the operating time of the compressor 21, electromagnetic torque, or discharge temperature. However, the present application is not limited thereto, and in other embodiments, the operating frequency thereof may be controlled according to other operating parameters of the compressor 21, for example, the discharge pressure or the discharge amount of the compressor 21, etc.
In addition, in other embodiments, the variable frequency driver 20 may also control the operation frequency of the compressor 21 according to other parameters of the variable frequency air conditioner, for example, adjust the operation frequency of the compressor 21 according to the power, current or voltage of the variable frequency air conditioner, which will not be described herein.
In one embodiment, the information of the preset parameter includes an operation time of the compressor 21. When the indoor temperature reaches the set temperature, the indoor circuit board 10 controls the variable frequency drive 20 and the compressor 21 to be turned off, and if the compressor 21 is operated at the same frequency for a long time without being turned off, the operation frequency of the compressor 21 is insufficient to reduce or raise the indoor temperature to the set temperature, and at this time, the frequency of the compressor 21 needs to be raised until the frequency of the compressor 21 is raised to the maximum frequency. That is, adjusting the own output frequency according to the information of the preset parameter to control the operation frequency of the compressor 21 includes: judging whether the operation time of the compressor 21 at the same frequency is greater than a preset time; if so, it is determined whether the operating frequency of the compressor 21 is the maximum frequency, and if not, the operating frequency of the compressor 21 is controlled to be greater than the current frequency of the compressor 21.
During operation of the compressor 21, an increase in frequency or load will result in an increase in the electromagnetic torque of the compressor 21. Based on this, in one embodiment, a plurality of intervals are set in advance for the frequency of the compressor 21, and an electromagnetic torque limit value is set for each frequency interval. If the electromagnetic torque of the compressor 21 exceeds the electromagnetic torque limit value of the current frequency interval, the compressor 21 is controlled to carry out frequency reduction until the electromagnetic torque is reduced below the corresponding torque limit value after frequency reduction, and the frequency reduction control of the compressor 21 is completed. Thereafter, the compressor 21 may be controlled to perform up-conversion. That is, adjusting the own output frequency according to the information of the preset parameter to control the operation frequency of the compressor 21 includes: judging whether the electromagnetic torque of the compressor 21 is larger than an electromagnetic torque limit value corresponding to the current frequency of the compressor 21; if so, it is determined whether the operating frequency of the compressor 21 is the minimum frequency, and if not, the operating frequency of the compressor 21 is controlled to be less than the current frequency of the compressor 21.
During operation of the compressor 21, if the discharge temperature of the compressor 21 is too high, the performance of the compressor 21 is affected, and thus, in one embodiment, the compressor 21 is subjected to the frequency-reducing process after the discharge temperature of the compressor 21 is greater than a preset temperature. That is, adjusting the own output frequency according to the information of the preset parameter to control the operation frequency of the compressor 21 includes: judging whether the exhaust temperature of the compressor 21 is greater than a preset temperature; if so, it is determined whether the operating frequency of the compressor 21 is the minimum frequency, and if not, the operating frequency of the compressor 21 is controlled to be less than the current frequency of the compressor 21.
In addition, it should be noted that, the existing outdoor unit of the conventional variable frequency air conditioner further includes an outside air temperature sensor and an outside coil temperature sensor, while the variable frequency air conditioner in this embodiment is improved by a conventional fixed frequency air conditioner, and the conventional fixed frequency air conditioner does not have the outside air temperature sensor and the outside coil temperature sensor, so the cost of the variable frequency air conditioner in the embodiment of the application is greatly reduced compared with that of the conventional variable frequency air conditioner.
According to the variable frequency air conditioner provided by the embodiment of the application, the indoor circuit board controls the working states of the variable frequency driver, the external fan and the reversing device, and the variable frequency driver controls the working states of the compressor, so that the outdoor unit does not need a high-power switch circuit (variable frequency driver) to drive the external fan, the reversing device and the like, and the indoor unit does not need a communication circuit to transmit information such as indoor temperature, set temperature and the like, and further the cost of the variable frequency air conditioner can be reduced by adopting the low-power variable frequency driver, and/or the cost of the variable frequency air conditioner can be reduced by not adopting the communication circuit. Moreover, by adopting the scheme of the embodiment of the application, the related components of the outdoor unit of the existing fixed-frequency air conditioner can be directly replaced to convert the fixed-frequency air conditioner into the variable-frequency air conditioner, so that the conversion cost is low, and the energy and the electricity are saved.
The embodiment of the application also provides a frequency conversion method of the frequency conversion air conditioner, which is applied to the frequency conversion air conditioner provided by any embodiment, as shown in fig. 2, and comprises the following steps:
s201: the indoor circuit board controls the working states of the variable frequency driver, the external fan and the reversing device;
s202: the variable frequency drive controls the operating state of the compressor.
Wherein when the variable frequency drive and the compressor are in an on state, further comprising:
and the variable frequency driver adjusts the output frequency of the variable frequency driver according to the information of the preset parameters and controls the running frequency of the compressor.
When the air conditioner is started, the indoor circuit board of the indoor unit controls the variable frequency driver, the external fan and the reversing device to be started, the variable frequency driver controls the compressor to be started, and the output frequency of the variable frequency driver is adjusted according to information of preset parameters in the operation process of the compressor so as to control the operation frequency of the compressor. It should be noted that, in this embodiment, when the indoor temperature does not reach the set temperature, the indoor circuit board controls the variable frequency driver and the compressor to be turned on, and in the process of the operation of the compressor, the variable frequency driver adjusts the frequency of the compressor, and when the indoor temperature reaches the set temperature, the indoor circuit board controls the variable frequency driver to be turned off, so as to turn off the compressor.
In this embodiment, the variable frequency driver adjusts its own output frequency according to information of preset parameters, so as to control the operation frequency of the compressor, including:
the variable frequency driver adjusts the output frequency of the variable frequency driver according to the first opening time length of the variable frequency driver when the variable frequency air conditioner is started so as to control the running frequency of the compressor, wherein the first opening time length is related to the difference value between the indoor temperature and the set temperature.
Specifically, when the variable frequency air conditioner is started, the indoor circuit board can control the variable frequency driver to be rapidly switched on and off once, namely, control the variable frequency driver to be switched on after a certain time interval, and control the variable frequency driver to be switched off, so that the difference value between the indoor temperature and the set temperature is transmitted to the variable frequency driver. And finally, formally controlling the variable frequency driver to be started so as to perform normal operation.
In this embodiment, a correspondence between the difference between the indoor temperature and the set temperature and the first turn-on duration of the variable frequency drive is preset, for example, the longer the turn-on duration of the variable frequency drive is, the larger the difference between the indoor temperature and the set temperature is. Further, when the difference between the indoor temperature and the set temperature is larger, the variable frequency driver controls the compressor to operate at a larger frequency so as to realize rapid cooling, and when the difference between the indoor temperature and the set temperature is smaller, the variable frequency driver controls the compressor to operate at a smaller frequency so as to achieve the energy-saving effect.
In this embodiment, the variable frequency drive does not need to receive the indoor temperature and the set temperature, and therefore, a communication circuit is not required. The control of the starting time of the variable frequency driver is only carried out through the indoor circuit board, the simulation of the difference value between the indoor temperature and the set temperature is realized, and the variable frequency driver controls the output frequency during normal operation according to the first starting time of the variable frequency driver, so that the control of the operation frequency of the compressor is realized. Of course, the present application is not limited thereto, and in other embodiments, the information of the difference between the indoor temperature and the set temperature may be transmitted to the variable frequency drive by setting the difference between the indoor temperature and the set temperature to be smaller as the variable frequency drive is turned on longer.
In addition, when the indoor temperature reaches the set temperature, the indoor circuit board controls the variable frequency driver and the compressor to be turned off, if the compressor runs at the same frequency for a long time without being turned off, the running frequency of the compressor is insufficient to reduce or raise the indoor temperature to the set temperature, and at this time, the frequency of the compressor needs to be raised until the frequency of the compressor is raised to the maximum frequency.
Based on this, in another embodiment of the present application, the variable frequency drive adjusts its own output frequency according to information of preset parameters to control the operation frequency of the compressor, including:
the variable frequency driver judges whether the running time of the compressor at the same frequency is longer than the preset time;
if so, judging whether the operating frequency of the compressor is the maximum frequency, and if not, adjusting the output frequency of the compressor to control the operating frequency of the compressor to be larger than the current frequency of the compressor.
In addition, during operation of the compressor, an increase in frequency or load may result in an increase in compressor electrical torque. Based on this, a plurality of frequency intervals are set for the compressor, and an electromagnetic torque limit value is set for each frequency interval. And if the electromagnetic torque of the compressor exceeds the electromagnetic torque limit value of the current frequency interval, controlling the compressor to carry out frequency reduction until the electromagnetic torque is reduced below the corresponding torque limit value after frequency reduction, and completing the frequency reduction control of the compressor. Thereafter, the compressor may be controlled to perform an up-conversion.
Based on this, in another embodiment of the present application, the variable frequency driver adjusts its own output frequency according to the information of the preset parameters, so as to control the operation frequency of the compressor, including:
the variable frequency driver judges whether the electromagnetic torque of the compressor is larger than an electromagnetic torque limit value corresponding to the current frequency of the compressor;
if so, judging whether the operating frequency of the compressor is the minimum frequency, and if not, adjusting the output frequency of the compressor to control the operating frequency of the compressor to be smaller than the current frequency of the compressor.
In addition, during the operation of the compressor, if the exhaust temperature of the compressor is too high, the performance of the compressor is affected, so that the compressor can be subjected to the frequency-reducing treatment after the exhaust temperature of the compressor is greater than the preset temperature.
Based on this, in another embodiment of the present application, the variable frequency driver adjusts its own output frequency according to the information of the preset parameters, so as to control the operation frequency of the compressor, including:
the variable frequency driver judges whether the exhaust temperature of the compressor is higher than a preset temperature;
if so, judging whether the operating frequency of the compressor is the minimum frequency, and if not, adjusting the output frequency of the compressor to control the operating frequency of the compressor to be smaller than the current frequency of the compressor.
According to the frequency conversion method of the variable frequency air conditioner, the indoor circuit board controls the working states of the variable frequency driver, the outer fan and the reversing device, and the variable frequency driver controls the working states of the compressor, so that the outdoor unit does not need a high-power switch circuit (variable frequency driver) to drive the outer fan, the reversing device and the like, a communication circuit is not needed on the indoor unit and the outdoor unit to transmit information such as indoor temperature, set temperature and the like, and further the cost of the variable frequency air conditioner can be reduced by adopting the low-power variable frequency driver, and/or the cost of the variable frequency air conditioner can be reduced by not adopting the communication circuit.
Moreover, by adopting the scheme of the embodiment of the application, the related components of the outdoor unit of the existing fixed-frequency air conditioner can be directly replaced to convert the fixed-frequency air conditioner into the variable-frequency air conditioner, so that the conversion cost is low, the energy consumption can be greatly improved, and the waste of resources can be reduced.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The variable frequency air conditioner is characterized by comprising an indoor unit and an outdoor unit, wherein the indoor unit comprises an indoor circuit board, the outdoor unit comprises a compressor, an external fan and a reversing device, and the outdoor unit further comprises a variable frequency driver;
the indoor circuit board is connected with the variable frequency driver, the external fan and the reversing device and used for controlling the working states of the variable frequency driver, the external fan and the reversing device;
the indoor circuit board comprises a first control output end, a second control output end and a third control output end;
the first control output end is connected with the variable frequency driver and used for controlling the working state of the variable frequency driver;
the second control output end is connected with the external fan and used for controlling the working state of the external fan;
the third control output end is connected with the reversing device and is used for controlling the working state of the reversing device;
the variable frequency driver is connected with the compressor and used for controlling the working state of the compressor;
when the variable frequency driver and the compressor are in an on state, the variable frequency driver adjusts the output frequency of the variable frequency driver according to information of preset parameters, and controls the running frequency of the compressor.
2. The variable frequency air conditioner of claim 1, wherein the second control output and the third control output are connected to the external blower and the reversing device, respectively, through a power circuit that includes a drive capacitor.
3. The variable frequency air conditioner according to claim 1, wherein the preset parameters include:
and one or more of a difference between the indoor temperature and the set temperature, an operation parameter of the compressor and an operation parameter of the variable frequency air conditioner.
4. A variable frequency air conditioner according to claim 3, wherein the difference between the indoor temperature and the set temperature is related to the on-time of the variable frequency drive for the first time;
the operating parameters of the compressor include an operating time of the compressor, an electromagnetic torque, or a discharge temperature;
the working parameters of the variable frequency air conditioner comprise power, current or voltage.
5. A control method of a variable frequency air conditioner, which is characterized in that the control method is applied to the variable frequency air conditioner according to any one of claims 1 to 4, and comprises the following steps:
the indoor circuit board controls the working states of the variable frequency driver, the external fan and the reversing device;
the indoor circuit board comprises a first control output end, a second control output end and a third control output end;
the first control output end is connected with the variable frequency driver and used for controlling the working state of the variable frequency driver;
the second control output end is connected with the external fan and used for controlling the working state of the external fan;
the third control output end is connected with the reversing device and used for controlling the working state of the reversing device;
the variable frequency driver controls the working state of the compressor;
when the variable frequency driver and the compressor are in an on state, the variable frequency driver adjusts the output frequency of the variable frequency driver according to information of preset parameters, and controls the running frequency of the compressor.
6. The control method according to claim 5, wherein the variable frequency drive adjusts its own output frequency according to information of preset parameters, and controlling the operating frequency of the compressor comprises:
the variable frequency driver adjusts the output frequency of the variable frequency driver according to the first starting time length of the variable frequency driver when the variable frequency air conditioner is started, and controls the running frequency of the compressor;
wherein the first opening duration is related to a difference between the indoor temperature and the set temperature.
7. The control method according to claim 5, wherein the variable frequency drive adjusts its own output frequency according to information of preset parameters, and controlling the operating frequency of the compressor comprises:
the variable frequency driver judges whether the running time of the compressor at the same frequency is longer than a preset time;
if so, judging whether the operating frequency of the compressor is the maximum frequency, if not, adjusting the output frequency of the compressor, and controlling the operating frequency of the compressor to be larger than the current frequency of the compressor.
8. The control method according to claim 5, wherein the variable frequency drive adjusts its own output frequency according to information of preset parameters, and controlling the operating frequency of the compressor comprises:
the variable frequency driver judges whether the electromagnetic torque of the compressor is larger than an electromagnetic torque limit value corresponding to the current frequency of the compressor;
if so, judging whether the operating frequency of the compressor is the minimum frequency, if not, adjusting the output frequency of the compressor, and controlling the operating frequency of the compressor to be smaller than the current frequency of the compressor.
9. The control method according to claim 5, wherein the variable frequency drive adjusts its own output frequency according to information of preset parameters, and controlling the operating frequency of the compressor comprises:
the variable frequency driver judges whether the exhaust temperature of the compressor is higher than a preset temperature;
if so, judging whether the operating frequency of the compressor is the minimum frequency, if not, adjusting the output frequency of the compressor, and controlling the operating frequency of the compressor to be smaller than the current frequency of the compressor.
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| CN109210737A (en) | 2019-01-15 |
| CN208887039U (en) | 2019-05-21 |
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