CN114165893A - Control device and method of machine room refrigerating system and machine room refrigerating system - Google Patents

Control device and method of machine room refrigerating system and machine room refrigerating system Download PDF

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Publication number
CN114165893A
CN114165893A CN202111444849.4A CN202111444849A CN114165893A CN 114165893 A CN114165893 A CN 114165893A CN 202111444849 A CN202111444849 A CN 202111444849A CN 114165893 A CN114165893 A CN 114165893A
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CN
China
Prior art keywords
machine room
temperature
refrigerating system
refrigeration system
unit
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CN202111444849.4A
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Chinese (zh)
Inventor
卢海
郑波
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202111444849.4A priority Critical patent/CN114165893A/en
Publication of CN114165893A publication Critical patent/CN114165893A/en
Pending legal-status Critical Current

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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
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • 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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

Abstract

The invention discloses a control device and a method of a machine room refrigerating system and the machine room refrigerating system, wherein the device comprises: a control unit configured to control the compressor to start and adjust an opening degree of the throttle unit to a first set opening degree; the sampling unit is configured to sample the outdoor temperature of the machine room refrigeration system after the compressor runs for a first set time; and the control unit is also configured to determine the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system so as to control the machine room refrigeration system to switch between the set refrigeration mode and the set air pump mode. According to the scheme, the air pump refrigerating system is adopted in the machine room refrigerating system, and the air pump refrigerating system is controlled to operate in different modes according to different indoor and outdoor working condition parameters, so that the power consumption of the machine room refrigerating system can be reduced.

Description

Control device and method of machine room refrigerating system and machine room refrigerating system
Technical Field
The invention belongs to the technical field of air pump refrigeration systems, and particularly relates to a control device and a control method of a machine room refrigeration system and the machine room refrigeration system, in particular to the control device and the control method of the machine room refrigeration system and the air pump refrigeration system.
Background
In public buildings, the power consumption of the air conditioner accounts for the total power consumption of the building. In the power consumption of the air conditioner, the power consumption of a machine room refrigerating system (including a cooler, a water pump and a cooling tower) is adjusted by about 85% of the power consumption.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a control device and a control method of a machine room refrigerating system and the machine room refrigerating system, which aim to solve the problem of high power consumption of the machine room refrigerating system and achieve the effect of reducing the power consumption of the machine room refrigerating system by adopting an air pump refrigerating system in the machine room refrigerating system and controlling the air pump refrigerating system to operate in different modes according to different indoor and outdoor working condition parameters.
In a control device of a machine room refrigeration system, the machine room air conditioning system includes: the system comprises a compressor unit, an evaporator, a throttling unit and a condenser; the compressor unit forms a refrigeration loop through the evaporator, the throttling unit and the condenser; the compressor unit includes: a compressor and an air pump; the control device of the machine room refrigerating system comprises: a sampling unit and a control unit; wherein the control unit is configured to control the compressor to start and adjust the opening degree of the throttling unit to a first set opening degree; the sampling unit is configured to sample the outdoor temperature of the machine room refrigeration system after the compressor runs for a first set time; the control unit is further configured to determine an operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system so as to control the machine room refrigeration system to switch between a set refrigeration mode and a set air pump mode.
In some embodiments, wherein in the compressor unit, the compressor and the air pump are integrally disposed or disposed in parallel; under the condition that the compressor and the air pump are integrally arranged, the compressor and the air pump form compressor integrated equipment; and/or, the throttling unit comprises: the electronic expansion valves are independently arranged or the electronic expansion valve modules are arranged in parallel; the electronic expansion valve module arranged in parallel comprises two electronic expansion valves arranged in parallel, or an electronic expansion valve and an electromagnetic valve arranged in parallel, or an electronic expansion valve and an electric flow regulating valve arranged in parallel.
In some embodiments, the control unit determining the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system includes: determining whether the outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature; if the outdoor temperature of the machine room refrigerating system is less than or equal to the set temperature, controlling the machine room refrigerating system to operate in a set air pump mode; and if the outdoor temperature of the machine room refrigerating system is higher than the set temperature, controlling the machine room refrigerating system to operate in a set refrigerating mode.
In some embodiments, the control unit, controlling the machine room refrigeration system to operate in a set refrigeration mode, includes: adjusting the rotating speed of an external fan of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system and the frequency of a compressor; adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system; adjusting the opening degree of a throttling unit of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system; if the outdoor temperature of the machine room refrigeration system is smaller than the difference between the set temperature and the set temperature multiplied by the set factor, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system; and if the outdoor temperature of the machine room refrigerating system is greater than or equal to the difference between the set temperature and the set temperature multiplied by the set factor, adjusting the opening of the throttling unit of the machine room refrigerating system again according to the suction temperature and the evaporation temperature of the machine room refrigerating system.
In some embodiments, wherein the controlling unit adjusts the external fan speed of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system and the compressor frequency, the controlling unit includes: determining the sum of a first temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system and a first frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the rotating speed of an outer fan of the machine room refrigerating system, and controlling the outer fan of the machine room refrigerating system to operate according to the rotating speed of the outer fan; the control unit adjusts the opening degree of the throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system, and comprises the following components: determining the sum of a second temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system, a third temperature proportional coefficient multiple of the indoor temperature of the machine room refrigerating system and a second frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the opening degree of the throttling unit of the machine room refrigerating system, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree; the control unit adjusts the opening degree of a throttling unit of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system, and comprises: and determining the opening degree of a throttling unit of the machine room refrigerating system as the fourth set temperature coefficient times of the difference between the suction temperature of the machine room refrigerating system, the evaporation temperature of the machine room refrigerating system and half of the sum of the upper limit and the lower limit of the set temperature interval, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
In some embodiments, the control unit, controlling the machine room refrigeration system to operate in the set air pump mode, includes: adjusting the rotating speed of an external fan of the machine room refrigerating system to a first set rotating speed; adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree; after the machine room refrigeration system is controlled to operate for a second set time, the operation mode of the compressor unit is switched from the refrigeration mode in which the compressor participates in operation to the air pump mode in which the air pump participates in operation; adjusting the rotating speed of an external fan of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system; if the outdoor temperature of the machine room refrigeration system is greater than the sum of the set temperature and the set temperature multiplied by the set coefficient, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system; and if the outdoor temperature of the machine room refrigerating system is less than or equal to the sum of the set temperature and the set temperature multiplied by the set coefficient, the suction temperature and the evaporation temperature of the machine room refrigerating system are increased again, and the rotating speed of an external fan of the machine room refrigerating system is adjusted.
In some embodiments, the control unit, the suction temperature and the evaporation temperature of the machine room refrigeration system, and adjusting the external fan speed of the machine room refrigeration system, includes: and determining the rotation speed of an external fan of the machine room refrigeration system as a fifth set temperature coefficient times the difference between the suction temperature of the machine room refrigeration system, the evaporation temperature of the machine room refrigeration system and half of the sum of the upper limit and the lower limit of a set temperature interval, and controlling the external fan of the machine room refrigeration system to operate according to the rotation speed of the external fan.
In accordance with another aspect of the present invention, there is provided a machine room cooling system, comprising: the control device of the machine room refrigeration system is described above.
In another aspect, the present invention provides a method for controlling a machine room refrigeration system, where the machine room air conditioning system includes: the system comprises a compressor unit, an evaporator, a throttling unit and a condenser; the compressor unit forms a refrigeration loop through the evaporator, the throttling unit and the condenser; the compressor unit includes: a compressor and an air pump; the control method of the machine room refrigerating system comprises the following steps: controlling the compressor to start, and adjusting the opening degree of the throttling unit to a first set opening degree; sampling the outdoor temperature of the machine room refrigerating system after the compressor runs for a first set time; and determining the operation mode of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system so as to control the machine room refrigerating system to switch between the set refrigerating mode and the set air pump mode for operation.
In some embodiments, determining the operating mode of the machine room refrigeration system based on an outdoor temperature of the machine room refrigeration system comprises: determining whether the outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature; if the outdoor temperature of the machine room refrigerating system is less than or equal to the set temperature, controlling the machine room refrigerating system to operate in a set air pump mode; and if the outdoor temperature of the machine room refrigerating system is higher than the set temperature, controlling the machine room refrigerating system to operate in a set refrigerating mode.
In some embodiments, controlling the machine room refrigeration system to operate in a set refrigeration mode includes: adjusting the rotating speed of an external fan of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system and the frequency of a compressor; adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system; adjusting the opening degree of a throttling unit of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system; if the outdoor temperature of the machine room refrigeration system is smaller than the difference between the set temperature and the set temperature multiplied by the set factor, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system; and if the outdoor temperature of the machine room refrigerating system is greater than or equal to the difference between the set temperature and the set temperature multiplied by the set factor, adjusting the opening of the throttling unit of the machine room refrigerating system again according to the suction temperature and the evaporation temperature of the machine room refrigerating system.
In some embodiments, wherein adjusting the speed of the external fan of the machine room refrigeration system based on the outdoor temperature of the machine room refrigeration system and the compressor frequency comprises: determining the sum of a first temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system and a first frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the rotating speed of an outer fan of the machine room refrigerating system, and controlling the outer fan of the machine room refrigerating system to operate according to the rotating speed of the outer fan; according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system, the opening degree of a throttling unit of the machine room refrigerating system is adjusted, and the method comprises the following steps: determining the sum of a second temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system, a third temperature proportional coefficient multiple of the indoor temperature of the machine room refrigerating system and a second frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the opening degree of the throttling unit of the machine room refrigerating system, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree; according to computer lab refrigerating system's temperature of breathing in and evaporating temperature, adjust the aperture of computer lab refrigerating system's throttle unit, include: and determining the opening degree of a throttling unit of the machine room refrigerating system as the fourth set temperature coefficient times of the difference between the suction temperature of the machine room refrigerating system, the evaporation temperature of the machine room refrigerating system and half of the sum of the upper limit and the lower limit of the set temperature interval, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
In some embodiments, controlling the machine room refrigeration system to operate in the set air pump mode includes: adjusting the rotating speed of an external fan of the machine room refrigerating system to a first set rotating speed; adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree; after the machine room refrigeration system is controlled to operate for a second set time, the operation mode of the compressor unit is switched from the refrigeration mode in which the compressor participates in operation to the air pump mode in which the air pump participates in operation; adjusting the rotating speed of an external fan of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system; if the outdoor temperature of the machine room refrigeration system is greater than the sum of the set temperature and the set temperature multiplied by the set coefficient, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system; and if the outdoor temperature of the machine room refrigerating system is less than or equal to the sum of the set temperature and the set temperature multiplied by the set coefficient, the suction temperature and the evaporation temperature of the machine room refrigerating system are increased again, and the rotating speed of an external fan of the machine room refrigerating system is adjusted.
In some embodiments, adjusting the external fan speed of the machine room refrigeration system based on the suction temperature and the evaporation temperature of the machine room refrigeration system comprises: and determining the rotation speed of an external fan of the machine room refrigeration system as a fifth set temperature coefficient times the difference between the suction temperature of the machine room refrigeration system, the evaporation temperature of the machine room refrigeration system and half of the sum of the upper limit and the lower limit of a set temperature interval, and controlling the external fan of the machine room refrigeration system to operate according to the rotation speed of the external fan.
Therefore, according to the scheme of the invention, the combination arrangement form of the air pump and the compressor is sampled in the machine room refrigeration system, and after the machine room refrigeration system is started, the refrigeration mode and the air pump mode of the compressor are controlled to switch and operate according to the outdoor temperature; therefore, the air pump refrigerating system is adopted in the machine room refrigerating system, and the air pump refrigerating system is controlled to operate in different modes according to different indoor and outdoor working condition parameters, so that the power consumption of the machine room refrigerating system can be reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a control device of a machine room refrigeration system according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a machine room refrigeration system;
FIG. 3 is a schematic flow chart diagram of one embodiment of a method for controlling the start-up and mode switching of a machine room refrigeration system;
FIG. 4 is a schematic flow chart diagram illustrating an embodiment of a method for pre-setting control of a cooling mode of a machine room cooling system;
FIG. 5 is a schematic flow chart diagram illustrating an exemplary method for controlling the air pump mode presetting of the machine room refrigeration system;
fig. 6 is a schematic flow chart of an embodiment of the control method of the machine room refrigeration system of the present invention;
fig. 7 is a schematic flow chart illustrating an embodiment of determining the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system in the method of the present invention;
fig. 8 is a schematic flow chart illustrating an embodiment of the method of the present invention for controlling the machine room refrigeration system to operate in the set refrigeration mode;
fig. 9 is a schematic flow chart illustrating an embodiment of the method for controlling the operation of the machine room refrigeration system in the set air pump mode according to the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
1-compressing the air pump integrated equipment; 2-a condenser; 3-an electromagnetic valve; 4-an electronic expansion valve; 5-evaporator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The energy-saving potential of the machine room refrigerating system is very great, so that the development of a fluorine pump air conditioner becomes a better choice. The fluorine pump technology utilizes the characteristic that the temperature is lower in most areas in winter, takes the refrigerant as a carrier, and utilizes the refrigerant pump to directly carry out heat exchange between indoor high temperature and outdoor low temperature, so that an outdoor cold source is fully utilized, and the energy consumption of the air conditioner in a machine room is reduced.
According to an embodiment of the present invention, a control apparatus of a machine room refrigeration system is provided. Fig. 1 shows a schematic structural diagram of an embodiment of the apparatus of the present invention. The machine room air conditioning system comprises: a compressor unit, an evaporator 5, a throttle unit and a condenser 2. The compressor unit, via the evaporator 5, the throttling unit and the condenser 2, forms a refrigeration circuit. The compressor unit includes: the compressor unit is in a form of combination arrangement of the compressor and the air pump.
In some embodiments, in the compressor unit, the compressor and the air pump are integrally disposed or disposed in parallel. In case the compressor and the air pump are arranged integrally, the compressor and the air pump form a compressor-integrated apparatus (1).
Fig. 2 is a schematic diagram of an embodiment of a machine room cooling system. As shown in fig. 2, a machine room refrigeration system, in particular to an air pump refrigeration system, mainly comprises a compression air pump integrated device 1, a condenser 2, an electromagnetic valve 3, an electronic expansion valve 4, an evaporator 5 and the like. The compression and air pump integrated device 1 passes through the evaporator 5, then passes through the electromagnetic valve 3 and the electronic expansion valve 4 which are connected in parallel, and then returns to the compression and air pump integrated device 1 after passing through the condenser 2.
In the example shown in fig. 2, the compression-air pump integrated apparatus 1 has two operation modes of the compressor and the air pump. The compression and air pump integrated equipment 1 can also adopt a scheme that a compressor is connected with an air pump device in parallel, or adopt other forms of air pump systems, and can also greatly improve the energy efficiency of the unit under the low-temperature refrigeration working condition.
In some embodiments, the throttling unit comprises: the electronic expansion valves are arranged independently or the electronic expansion valve modules are arranged in parallel. The electronic expansion valve module arranged in parallel comprises two electronic expansion valves arranged in parallel, or an electronic expansion valve and an electromagnetic valve arranged in parallel, or an electronic expansion valve and an electric flow regulating valve arranged in parallel.
In the example shown in fig. 2, the combination of the bypass solenoid valve (e.g., solenoid valve 3) and the electronic expansion valve 4 may be replaced by a single electronic expansion valve, or two electronic expansion valves connected in parallel, or an electronic expansion valve connected in parallel with the solenoid valve, or an electric flow rate regulating valve connected in parallel with the electronic expansion valve.
In some embodiments, the control device of the machine room refrigeration system comprises: a sampling unit and a control unit. A sampling unit, such as a sensor unit. A control unit, such as a controller for a machine room refrigeration system.
Wherein the control unit is configured to control the compressor to start and operate when the machine room refrigeration system needs to be started and operatedAnd adjusting the opening degree of the throttling unit to a first set opening degree. A first set opening, e.g. set opening b0。
The sampling unit is configured to sample the outdoor temperature of the machine room refrigeration system after the compressor operates for a first set time period.
The control unit is further configured to determine an operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system so as to control the machine room refrigeration system to switch between a set refrigeration mode and a set air pump mode.
The invention provides a control scheme of a machine room refrigerating system, which adopts integrated equipment with functions of an air pump and a compressor, and can greatly reduce the equipment cost while realizing the reduction of energy consumption by utilizing a natural cold source. The air pump air conditioning unit can greatly improve the energy efficiency of the unit at low temperature and in transition seasons, and reduce energy consumption.
The air pump technology is used as a year-round refrigeration system, the working condition range is very wide, the running state of the air pump technology is obviously changed along with day and night and seasons, and certain difficulty is brought to the stability of the air pump refrigeration system. Compared with the common machine room air conditioner, the air pump and compressor integrated equipment related by the scheme of the invention has more complex setting requirements on the air pump refrigeration system during operation, and provides a control method for starting and mode adjustment of the air pump refrigeration system to ensure normal and stable operation of the air pump refrigeration system all the year round.
In some embodiments, the control unit determining the operation mode of the machine room refrigeration system according to an outdoor temperature of the machine room refrigeration system includes:
the control unit is specifically further configured to determine whether an outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature, such as a set temperature T.
The control unit is specifically configured to control the machine room refrigeration system to operate in a set air pump mode if the outdoor temperature of the machine room refrigeration system is less than or equal to the set temperature.
The control unit is specifically configured to control the machine room refrigeration system to operate in a set refrigeration mode if the outdoor temperature of the machine room refrigeration system is greater than the set temperature.
Fig. 3 is a flowchart illustrating an embodiment of a method for controlling the start-up and mode switching of a machine room cooling system. As shown in fig. 3, a method for controlling the start-up and mode switching of a machine room refrigeration system includes:
step 11, when a unit of the machine room refrigeration system is started, firstly, a compressor of the unit needs to be started, for example, the compression and air pump integrated equipment 1 of the unit is started, and then, the opening degree of a throttling device (for example, an electronic expansion valve 4) of the unit is adjusted to be a set throttling opening degree b0And operates for a set time period t0And the stable starting of the unit is ensured when the unit is started.
And step 12, detecting the outdoor temperature, and judging whether the outdoor temperature is less than or equal to a set temperature T: if yes, go to step 13. Otherwise, step 14 is performed.
And step 13, when the outdoor temperature is less than or equal to the set temperature T, enabling the unit to operate the air pump mode. In the air pump mode, only the air pump is operated and the compressor is not operated. In the air pump mode, the rotating speed of an external fan of the machine room air conditioning system is controlled to be adjusted to a set rotating speed n0And controlling the opening degree of the throttling device to be adjusted to the set maximum opening degree. Set time t for operation2And then controlling the compression-air pump integrated device 1 to switch to the air pump mode, adjusting the rotating speed n2' of the external fan according to a preset method, and returning to the step 12 under the condition that the outdoor temperature is greater than the sum of the set temperature T and the set temperature T of which the set coefficient is multiplied by delta. Otherwise, the rotating speed n2' of the outer fan is adjusted according to the preset method.
And 14, when the outdoor temperature is higher than the set temperature T, enabling the unit to operate in a refrigeration mode. In the cooling mode, the air pump is not operated, and the compressor is operatedAnd (5) operating. In the refrigeration mode, the operation parameters and the operation conditions of the compression-air pump integrated equipment 1 are detected, and the opening b of the throttling device is calculated and adjusted according to the operation parameters and the operation conditions of the compression-air pump integrated equipment 11And the rotating speed n of the outer fan1. The opening degree of the throttle device is adjusted according to a preset method, and in the case where the outdoor temperature is less than the difference between the set temperature T and the set temperature T at which the set coefficient is multiplied by δ, the process returns to step 12. Otherwise, continuously adjusting the opening of the throttling device according to a preset method.
In the example shown in fig. 3, the air pump mode operating condition is that the outdoor temperature is less than or equal to the set temperature T, and the determination of the actual air pump mode operating condition includes, but is not limited to, such refrigeration system parameters as outdoor temperature, indoor temperature, outdoor humidity, indoor humidity, condensing pressure, evaporating pressure, pressure ratio, pressure difference, and the like, and parameters such as season, month, day and night.
For example: when the temperature of northern part cities is low in 11, 12, 1 and 2 months, the air pump mode can be operated to reduce the energy consumption, or the air pump mode can be operated to reduce the energy consumption in transition seasons (spring, autumn, 2, 3 and 10 months) when the temperature is low at night; the air pump mode can also be operated to reduce energy consumption when the pressure ratio is reduced below 1.8.
In the scheme of the invention, when the air pump unit is started to operate, different modes are operated according to different indoor and outdoor working condition parameters, so that the annual refrigeration requirement of the air pump unit is met, and the stability of the air pump unit is improved. According to the air pump unit starting and mode adjusting control logic provided by the scheme of the invention, the problem that the operation of the air pump unit is likely to fluctuate when the air pump unit is started under different working conditions and operates in different modes is solved, and the air pump refrigeration system can be stably started and normally operated. That is to say, the scheme of the invention adopts the starting and mode adjusting control logic of the air pump unit, and solves the problem of operation fluctuation possibly generated when the air pump unit is started under various working conditions and operates in different modes, thereby ensuring that the machine room refrigerating system can be stably started and normally operated.
In some embodiments, the control unit, controlling the machine room refrigeration system to operate in a set refrigeration mode, includes:
the control unit is specifically configured to adjust the rotation speed of the external fan of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system and the compressor frequency. And adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system.
In some embodiments, the control unit, adjusting the external fan speed of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system and the compressor frequency, includes: the control unit is specifically configured to determine a sum of a first temperature scaling factor multiple of the outdoor temperature of the machine room refrigeration system and a first frequency scaling factor multiple of the compressor frequency of the machine room refrigeration system as the rotating speed of the external fan of the machine room refrigeration system, and control the external fan of the machine room refrigeration system to operate at the rotating speed of the external fan.
In the example shown in fig. 4, the external fan speed n of the machine room refrigeration system1Can be adjusted according to outdoor temperature and compressor frequency, e.g. F (n)1)＝a1Tout+a1F where a1、a1"is a proportionality coefficient, ToutIs the outdoor temperature and f is the compressor frequency.
In some embodiments, the controlling unit adjusting an opening degree of a throttling unit of the machine room refrigeration system according to an outdoor temperature, an indoor temperature and a compressor frequency of the machine room refrigeration system includes: the control unit is specifically configured to determine a sum of a second temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigeration system, a third temperature proportional coefficient multiple of the indoor temperature of the machine room refrigeration system, and a second frequency proportional coefficient multiple of the compressor frequency of the machine room refrigeration system as an opening degree of a throttling unit of the machine room refrigeration system, and control the throttling unit of the machine room refrigeration system to operate according to the opening degree.
In the example shown in fig. 4, the throttle opening b1And also according to indoor and outdoor temperature and compressor frequency,such as F (b)1)＝a2Tin+a2`Tout+a2' f, wherein a2、a2`、a2"is the proportionality coefficient, TinIs the indoor temperature, ToutIs the outdoor temperature and f is the compressor frequency.
The control unit is specifically configured to adjust the opening degree of a throttling unit of the machine room refrigeration system according to the suction temperature and the evaporation temperature of the machine room refrigeration system.
In some embodiments, the controlling unit adjusts an opening degree of a throttling unit of the machine room refrigeration system according to a suction temperature and an evaporation temperature of the machine room refrigeration system, and includes: the control unit is specifically configured to determine a fourth set temperature coefficient of a difference between a suction temperature of the machine room refrigeration system, an evaporation temperature of the machine room refrigeration system, and a half of a sum of an upper limit and a lower limit of a set temperature interval as an opening degree of a throttling unit of the machine room refrigeration system, and control the throttling unit of the machine room refrigeration system to operate according to the opening degree.
In the example shown in fig. 4, in this embodiment, the preset method of the throttling device in the cooling mode is controlled according to the unit suction superheat degree, specifically: detecting the air suction temperature and the evaporation temperature of the unit, calculating the current air suction superheat degree of the unit, and then detecting whether the air suction superheat degree of the unit is in a set temperature interval [ T [ ]1，T2]And if the current air suction superheat degree is not met, adjusting the opening degree of the throttling device according to the current air suction superheat degree, and adjusting the original opening degree according to a formula (1). At running Δ t1And returning to the step 21 after the time length standby group is stable, and repeating the steps.
Figure BDA0003383705710000111
In the formula (1), Δ b is an adjustment amount of the opening degree of the throttle device, a3Is a proportionality coefficient, TisIs the compressor suction temperature, TeIs the evaporation temperature.
The control unit is specifically configured to determine the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system if the outdoor temperature of the machine room refrigeration system is less than the difference between the set temperature and the set temperature multiplied by the set factor.
The control unit is specifically configured to adjust the opening degree of the throttling unit of the machine room refrigeration system again according to the suction temperature and the evaporation temperature of the machine room refrigeration system if the outdoor temperature of the machine room refrigeration system is greater than or equal to the difference between the set temperature and the set temperature multiplied by the set factor.
Fig. 4 is a flowchart illustrating an embodiment of a method for controlling a preset cooling mode of a machine room cooling system. As shown in fig. 3 and 4, a preset control method for a cooling mode of a machine room cooling system includes:
step 21, when the unit of the machine room refrigeration system operates in the refrigeration mode, firstly, detecting the operation parameters and the operation conditions of the compression-air pump integrated device 1, including but not limited to the indoor and outdoor temperatures, the air suction temperature, the exhaust temperature, the evaporation temperature, the condensation temperature, and other relevant parameters.
When the suction superheat degree or the exhaust temperature or the exhaust superheat degree is smaller than corresponding preset thresholds (namely the preset thresholds corresponding to the suction superheat degree, the exhaust temperature and the exhaust superheat degree respectively), controlling the rotating speed of the outer fan to increase or controlling the opening degree of the throttling device to decrease; when the suction superheat degree or the exhaust temperature or the exhaust superheat degree is larger than a corresponding preset threshold value, controlling the rotating speed of the outer fan to be reduced or controlling the opening degree of the throttling device to be increased; and when the suction superheat degree or the exhaust temperature or the exhaust superheat degree is equal to the corresponding preset threshold value, the rotating speed of the outer fan or the opening degree of the throttling device is kept unchanged.
And step 22, after the operation state of the unit is adjusted for the first time, the opening degree of the throttling device can be adjusted according to a preset method of the unit, the stable operation of the unit is maintained, meanwhile, whether the outdoor temperature is lower than a difference value between the set temperature T and the set temperature T with the set coefficient multiplied by delta, namely T-delta T is detected, if the outdoor temperature is larger than or equal to T-delta T, the opening degree of the throttling device is continuously adjusted according to the preset method of the unit, and the stable operation of the unit is maintained. And if the outdoor temperature is less than T-delta T, mode judgment is carried out again to enable the unit to be converted into an air pump mode to operate.
According to the scheme provided by the invention, the air pump unit starting and mode adjusting control method can ensure that the unit can be stably started and operated under the working condition all the year around, and the unit operation fluctuation is reduced. The control method can complete the switching of the unit operation modes on the premise of ensuring the stable operation of the unit, and effectively avoids the problem of unit operation fluctuation caused by frequent switching of the unit operation modes in a transition season through the preset throttling device and the external fan control method.
In some embodiments, the control unit, controlling the machine room refrigeration system to operate in the set air pump mode, includes:
the control unit is specifically further configured to adjust the rotation speed of the external fan of the machine room refrigeration system to a first set rotation speed, such as a set rotation speed n0. And adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree.
The control unit is specifically configured to control the operation mode of the compressor unit to be switched from a refrigeration mode in which the compressor participates in operation to an air pump mode in which the air pump participates in operation after the machine room refrigeration system operates for a second set duration. A second set period of time, e.g. set period of time t2。
The control unit is specifically configured to adjust the rotation speed of the external fan of the machine room refrigeration system according to the suction temperature and the evaporation temperature of the machine room refrigeration system.
In some embodiments, the control unit, the suction temperature and the evaporation temperature of the machine room refrigeration system, and adjusting the external fan speed of the machine room refrigeration system, includes: the control unit is specifically configured to determine a fifth set temperature coefficient of a difference between a suction temperature of the machine room refrigeration system, an evaporation temperature of the machine room refrigeration system, and a half of a sum of an upper limit and a lower limit of a set temperature interval as an external fan rotation speed of the machine room refrigeration system, and control the external fan of the machine room refrigeration system to operate at the fan rotation speed.
In the example shown in fig. 5, in this embodiment, the preset method of the external fan in the air pump mode is controlled according to the suction superheat of the unit, specifically: detecting the air suction temperature and the evaporation temperature of the unit, calculating the current air suction superheat degree of the unit, and then detecting whether the air suction superheat degree of the unit is in a set temperature interval [ T [ ]1，T2]If the current air suction superheat degree is not satisfied, adjusting the rotating speed of the outer fan according to the current air suction superheat degree, and adjusting the rotating speed of the original outer fan to be in operation delta t according to a formula 22And returning to the step 31 after the time length standby group is stabilized, and repeating the steps.
Figure BDA0003383705710000121
In equation 2, Δ n is the adjustment amount of the rotation speed of the outer fan, a4Is a proportionality coefficient, TisIs the compressor suction temperature, TeIs the evaporation temperature.
The control unit is specifically configured to determine the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system if the outdoor temperature of the machine room refrigeration system is greater than the sum of the set temperature and the set temperature multiplied by the set factor.
The control unit is specifically configured to, if the outdoor temperature of the machine room refrigeration system is less than or equal to the sum of the set temperature and a set temperature multiplied by a set factor, restart the suction temperature and the evaporation temperature of the machine room refrigeration system, and adjust the rotating speed of the external fan of the machine room refrigeration system.
Fig. 5 is a flowchart illustrating an embodiment of a method for controlling air pump mode presetting of a machine room refrigeration system. As shown in fig. 3 and 5, an air pump mode presetting control method for a machine room refrigerating system includes:
step 31, when the machine room refrigerating system is adoptedWhen the set operates in the air pump mode, firstly, the rotating speed of the external fan is adjusted to a set rotating speed n0At the same time, the opening of the throttling device is adjusted to be maximum, and the set time length t is set during operation2And then, the operation mode of the compressor is switched to the air pump mode, so that the compressor can stably operate in the air pump mode.
And step 32, adjusting the rotating speed of the outer fan according to a preset method of the unit to maintain the stable operation of the unit, detecting whether the outdoor temperature is higher than the sum of the set temperature T and the set temperature T which is a set coefficient times delta, namely T + delta T, and if the outdoor temperature is less than or equal to T + delta T, continuously adjusting the rotating speed of the outer fan according to the preset method of the unit to maintain the stable operation of the unit. And if the outdoor temperature is greater than T + delta T, mode judgment is carried out again to enable the unit to be converted into a refrigeration mode to operate.
In this embodiment, after the unit is stably operated, the determination condition for switching the operation mode is set to T ± δ T to ensure that the operation mode of the unit is frequently switched when the outdoor temperature fluctuates in a range near T, thereby destroying the stable operation state of the unit, and therefore, a fluctuation interval of [ T- δ T, T + δ T ] is set to avoid the occurrence of unstable operation of the unit caused by frequent switching of the operation mode of the unit.
The embodiment selects the suction superheat as the specific control parameter, and the control parameter includes but is not limited to suction superheat, discharge temperature and other such control parameters of the refrigeration system.
When the suction superheat degree or the exhaust temperature or the exhaust superheat degree is smaller than corresponding preset thresholds (namely the preset thresholds corresponding to the suction superheat degree, the exhaust temperature and the exhaust superheat degree respectively), controlling the rotating speed of the external fan to increase; when the suction superheat degree or the exhaust temperature or the exhaust superheat degree is larger than a corresponding preset threshold value, controlling the rotating speed of the outer fan to be reduced; and when the suction superheat degree or the exhaust temperature or the exhaust superheat degree is equal to the corresponding preset threshold value, the rotating speed of the outer fan is kept unchanged.
In the scheme of the invention, the air pump technology is adopted, a special control strategy needs to be designed for the starting of the unit and the selection of the operation mode, and the stable and safe operation of the unit can be ensured. The stable starting and running of the annual refrigeration of the air pump unit are realized by designing a special control strategy of the refrigeration system with the air pump equipment. That is to say, the scheme of the invention adopts a special control strategy of the refrigeration system with the air pump equipment, and solves the problem of operation fluctuation of the air pump unit under the characteristic working condition, thereby obtaining the stable starting and operation effects of year-round refrigeration of the air pump unit.
By adopting the technical scheme of the invention, the combination arrangement form of the air pump and the compressor is sampled in the machine room refrigerating system, and after the machine room refrigerating system is started, the refrigerating mode and the air pump mode of the compressor are controlled to switch and operate according to the outdoor temperature. Therefore, the air pump refrigerating system is adopted in the machine room refrigerating system, and the air pump refrigerating system is controlled to operate in different modes according to different indoor and outdoor working condition parameters, so that the power consumption of the machine room refrigerating system can be reduced.
According to the embodiment of the invention, the machine room refrigeration system corresponding to the control device of the machine room refrigeration system is also provided. The air pump refrigeration system may include: the control device of the machine room refrigeration system is described above.
Since the processes and functions of the air pump refrigeration system of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of the present embodiment.
By adopting the technical scheme of the invention, the combination arrangement form of the air pump and the compressor is sampled in the machine room refrigerating system, and the refrigerating mode and the air pump mode of the compressor are controlled to switch to operate according to the outdoor temperature after the machine room refrigerating system is started, so that the energy efficiency of the unit can be greatly improved in low temperature and transition seasons, and the energy consumption is reduced.
According to the embodiment of the invention, a control method of the machine room refrigeration system corresponding to the air pump refrigeration system is also provided, as shown in the flow chart of fig. 6, which is an embodiment of the method of the invention. The machine room air conditioning system comprises: a compressor unit, an evaporator 5, a throttle unit and a condenser 2. The compressor unit, via the evaporator 5, the throttling unit and the condenser 2, forms a refrigeration circuit. The compressor unit includes: the compressor unit is in a form of combination arrangement of the compressor and the air pump.
Fig. 2 is a schematic diagram of an embodiment of a machine room cooling system. As shown in fig. 2, a machine room refrigeration system, in particular to an air pump refrigeration system, mainly comprises a compression air pump integrated device 1, a condenser 2, an electromagnetic valve 3, an electronic expansion valve 4, an evaporator 5 and the like. The compression and air pump integrated device 1 passes through the evaporator 5, then passes through the electromagnetic valve 3 and the electronic expansion valve 4 which are connected in parallel, and then returns to the compression and air pump integrated device 1 after passing through the condenser 2.
In the example shown in fig. 2, the compression-air pump integrated apparatus 1 has two operation modes of the compressor and the air pump. The compression and air pump integrated device 1 can also adopt a scheme that a compressor is connected with an air pump in parallel, or other forms of air pump systems.
In the example shown in fig. 2, the combination of the bypass solenoid valve (e.g., solenoid valve 3) and the electronic expansion valve 4 may be replaced by a single electronic expansion valve, or two electronic expansion valves connected in parallel, or an electronic expansion valve connected in parallel with the solenoid valve, or an electric flow rate regulating valve connected in parallel with the electronic expansion valve.
In some embodiments, the control method of the machine room refrigeration system includes: step S110 to step S130.
In step S110, in the case that the machine room refrigeration system needs to be started and operated, the compressor is controlled to be started, and the opening degree of the throttling unit is adjusted to a first set opening degree. A first set opening, e.g. set opening b0。
At step S120, after the compressor operates for a first set length of time, the outdoor temperature of the machine room refrigeration system is sampled.
At step S130, determining an operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system, so as to control the machine room refrigeration system to switch between a set refrigeration mode and a set air pump mode.
The invention provides a control scheme of a machine room refrigerating system, which adopts integrated equipment with functions of an air pump and a compressor, and can greatly reduce the equipment cost while realizing the reduction of energy consumption by utilizing a natural cold source. The air pump air conditioning unit can greatly improve the energy efficiency of the unit at low temperature and in transition seasons, and reduce energy consumption.
The air pump technology is used as a year-round refrigeration system, the working condition range is very wide, the running state of the air pump technology is obviously changed along with day and night and seasons, and certain difficulty is brought to the stability of the air pump refrigeration system. Compared with the common machine room air conditioner, the air pump and compressor integrated equipment related by the scheme of the invention has more complex setting requirements on the air pump refrigeration system during operation, and provides a control method for starting and mode adjustment of the air pump refrigeration system to ensure normal and stable operation of the air pump refrigeration system all the year round.
In some embodiments, the specific process of determining the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system in step S130 is as follows for exemplary description.
With reference to the flowchart of fig. 7, a specific process of determining the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system in step S130 is further described, where the specific process includes: step S210 to step S230.
Step S210, determining whether the outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature, such as a set temperature T.
And step S220, if the outdoor temperature of the machine room refrigerating system is less than or equal to the set temperature, controlling the machine room refrigerating system to operate in a set air pump mode.
And step S230, if the outdoor temperature of the machine room refrigerating system is greater than the set temperature, controlling the machine room refrigerating system to operate in a set refrigerating mode.
Fig. 3 is a flowchart illustrating an embodiment of a method for controlling the start-up and mode switching of a machine room cooling system. As shown in fig. 3, a method for controlling the start-up and mode switching of a machine room refrigeration system includes:
step 11, when the unit of the machine room refrigeration system is started, firstly, a compressor of the unit needs to be started, for example, the compression and air pump integrated device 1 of the unit is started, and then, the opening degree of a throttling method (for example, an electronic expansion valve 4) of the unit is adjusted to be a set throttling opening degree b0And operates for a set time period t0And the stable starting of the unit is ensured when the unit is started.
And step 12, detecting the outdoor temperature, and judging whether the outdoor temperature is less than or equal to a set temperature T: if yes, go to step 13. Otherwise, step 14 is performed.
And step 13, when the outdoor temperature is less than or equal to the set temperature T, enabling the unit to operate the air pump mode. In the air pump mode, the rotating speed of an external fan of the machine room air conditioning system is controlled to be adjusted to a set rotating speed n0And controlling the opening degree of the throttling method to be adjusted to the set maximum opening degree. Set time t for operation2And then controlling the compression-air pump integrated device 1 to switch to the air pump mode, adjusting the rotating speed n2' of the external fan according to a preset method, and returning to the step 12 under the condition that the outdoor temperature is greater than the sum of the set temperature T and the set temperature T of which the set coefficient is multiplied by delta. Otherwise, the rotating speed n2' of the outer fan is adjusted according to the preset method.
And 14, when the outdoor temperature is higher than the set temperature T, enabling the unit to operate in a refrigeration mode. In the refrigeration mode, the operation parameters and the operation conditions of the compression-air pump integrated equipment 1 are detected, and the opening b of the throttling method is calculated and adjusted according to the operation parameters and the operation conditions of the compression-air pump integrated equipment 11And the rotating speed n of the outer fan1. The throttle method opening is adjusted according to a preset method, and in case the outdoor temperature is less than the difference between the set temperature T and the set temperature T at which the set coefficient is multiplied by δ, the process returns to step 12. Otherwise, continue according to the preThe method is set to adjust the opening of the throttling method.
In the example shown in fig. 3, the air pump mode operating condition is that the outdoor temperature is less than or equal to the set temperature T, and the determination of the actual air pump mode operating condition includes, but is not limited to, such conventional refrigeration system parameters as outdoor temperature, indoor temperature, outdoor humidity, indoor humidity, condensing pressure, evaporating pressure, pressure ratio, differential pressure, and the like, as well as parameters of season, month, day and night, and the like.
In the scheme of the invention, when the air pump unit is started to operate, different modes are operated according to different indoor and outdoor working condition parameters, so that the annual refrigeration requirement of the air pump unit is met, and the stability of the air pump unit is improved. According to the air pump unit starting and mode adjusting control logic provided by the scheme of the invention, the problem that the operation of the air pump unit is likely to fluctuate when the air pump unit is started under different working conditions and operates in different modes is solved, and the air pump refrigeration system can be stably started and normally operated. That is to say, the scheme of the invention adopts the starting and mode adjusting control logic of the air pump unit, and solves the problem of operation fluctuation possibly generated when the air pump unit is started under various working conditions and operates in different modes, thereby ensuring that the machine room refrigerating system can be stably started and normally operated.
In some embodiments, the specific process of controlling the machine room refrigeration system to operate in the set refrigeration mode in step S230 is described in the following exemplary description.
The following further describes, with reference to a schematic flow chart of an embodiment of controlling the machine room refrigeration system to operate in the set refrigeration mode in the method of the present invention shown in fig. 8, a specific process of controlling the machine room refrigeration system to operate in the set refrigeration mode in step S230, including: step S310 to step S340.
And S310, adjusting the rotating speed of an external fan of the machine room refrigerating system according to the outdoor temperature and the compressor frequency of the machine room refrigerating system. And adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system.
In some embodiments, the adjusting the rotation speed of the external fan of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system and the compressor frequency in step S310 includes: and determining the sum of a first temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system and a first frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the rotating speed of the outer fan of the machine room refrigerating system, and controlling the outer fan of the machine room refrigerating system to operate according to the rotating speed of the outer fan.
In the example shown in fig. 4, the external fan speed n of the machine room refrigeration system1Can be adjusted according to outdoor temperature and compressor frequency, e.g. F (n)1)＝a1Tout+a1F where a1、a1"is a proportionality coefficient, ToutIs the outdoor temperature and f is the compressor frequency.
In some embodiments, the adjusting the opening degree of the throttling unit of the machine room refrigeration system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigeration system in step S310 includes: and determining the sum of a second temperature proportional coefficient of the outdoor temperature of the machine room refrigerating system, a third temperature proportional coefficient of the indoor temperature of the machine room refrigerating system and a second frequency proportional coefficient of the compressor frequency of the machine room refrigerating system as the opening degree of the throttling unit of the machine room refrigerating system, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
In the example shown in fig. 4, the throttle method opening b1Also adjusted according to indoor and outdoor temperature and compressor frequency, e.g. F (b)1)＝a2Tin+a2`Tout+a2' f, wherein a2、a2`、a2"is the proportionality coefficient, TinIs the indoor temperature, ToutIs the outdoor temperature and f is the compressor frequency.
And S320, adjusting the opening of a throttling unit of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system.
In some embodiments, the adjusting the opening degree of the throttling unit of the machine room refrigeration system according to the suction temperature and the evaporation temperature of the machine room refrigeration system in step S320 includes: and determining the opening degree of a throttling unit of the machine room refrigerating system as the fourth set temperature coefficient times of the difference between the suction temperature of the machine room refrigerating system, the evaporation temperature of the machine room refrigerating system and half of the sum of the upper limit and the lower limit of the set temperature interval, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
In the example shown in fig. 4, in this embodiment, the preset method of the throttling method in the cooling mode is controlled according to the unit suction superheat degree, specifically: detecting the air suction temperature and the evaporation temperature of the unit, calculating the current air suction superheat degree of the unit, and then detecting whether the air suction superheat degree of the unit is in a set temperature interval [ T [ ]1，T2]And if the current air suction superheat degree is not met, adjusting the opening of the throttling method according to the current air suction superheat degree, and adjusting the original opening according to a formula (1). At running Δ t1And returning to the step 21 after the time length standby group is stable, and repeating the steps.
Figure BDA0003383705710000181
In the formula (1), Δ b is an adjustment amount of the opening degree of the throttle method, a3Is a proportionality coefficient, TisIs the compressor suction temperature, TeIs the evaporation temperature.
And step S330, determining the operation mode of the machine room refrigerating system again according to the outdoor temperature of the machine room refrigerating system if the outdoor temperature of the machine room refrigerating system is less than the difference between the set temperature and the set temperature multiplied by the set factor.
And step S340, if the outdoor temperature of the machine room refrigerating system is greater than or equal to the difference between the set temperature and the set temperature multiplied by the set factor, adjusting the opening degree of the throttling unit of the machine room refrigerating system again according to the suction temperature and the evaporation temperature of the machine room refrigerating system.
Fig. 4 is a flowchart illustrating an embodiment of a method for controlling a preset cooling mode of a machine room cooling system. As shown in fig. 3 and 4, a preset control method for a cooling mode of a machine room cooling system includes:
step 21, when the unit of the machine room refrigeration system operates in the refrigeration mode, firstly, detecting the operation parameters and the operation conditions of the compression-air pump integrated device 1, including but not limited to the indoor and outdoor temperatures, the air suction temperature, the exhaust temperature, the evaporation temperature, the condensation temperature, and other relevant parameters.
And step 22, after the operation state of the unit is adjusted for the first time, the opening degree of the throttling method can be adjusted according to a preset method of the unit, the stable operation of the unit is maintained, meanwhile, whether the outdoor temperature is lower than a difference value between the set temperature T and the set temperature T with the set coefficient multiplied by delta, namely T-delta T is detected, if the outdoor temperature is larger than or equal to T-delta T, the opening degree of the throttling method is continuously adjusted according to the preset method of the unit, and the stable operation of the unit is maintained. And if the outdoor temperature is less than T-delta T, mode judgment is carried out again to enable the unit to be converted into an air pump mode to operate.
According to the scheme provided by the invention, the air pump unit starting and mode adjusting control method can ensure that the unit can be stably started and operated under the working condition all the year around, and the unit operation fluctuation is reduced. The control method can complete the switching of the unit operation modes on the premise of ensuring the stable operation of the unit, and effectively avoids the problem of unit operation fluctuation caused by frequent switching of the unit operation modes in a transition season through a preset throttling method and an external fan control method.
In some embodiments, the specific process of controlling the machine room refrigeration system to operate in the set air pump mode in step S220 is as follows.
With reference to the flowchart of fig. 9 illustrating an embodiment of the method for controlling the machine room refrigeration system to operate in the set air pump mode, a specific process of controlling the machine room refrigeration system to operate in the set air pump mode in step S220 is further described, which includes: step S410 to step S450.
Step S410, refrigerating the machine roomThe speed of the external fan of the system is adjusted to a first set speed, e.g. set speed n0. And adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree.
And step S420, after the machine room refrigerating system is controlled to operate for a second set time, the operation mode of the compressor unit is switched from the refrigerating mode in which the compressor participates in operation to the air pump mode in which the air pump participates in operation. A second set period of time, e.g. set period of time t2。
And step S430, adjusting the rotating speed of an external fan of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system.
In some embodiments, the adjusting the rotation speed of the external fan of the machine room refrigeration system according to the suction temperature and the evaporation temperature of the machine room refrigeration system in step S430 includes: and determining the rotation speed of an external fan of the machine room refrigeration system as a fifth set temperature coefficient times the difference between the suction temperature of the machine room refrigeration system, the evaporation temperature of the machine room refrigeration system and half of the sum of the upper limit and the lower limit of a set temperature interval, and controlling the external fan of the machine room refrigeration system to operate according to the rotation speed of the external fan.
In the example shown in fig. 5, in this embodiment, the preset method of the external fan in the air pump mode is controlled according to the suction superheat of the unit, specifically: detecting the air suction temperature and the evaporation temperature of the unit, calculating the current air suction superheat degree of the unit, and then detecting whether the air suction superheat degree of the unit is in a set temperature interval [ T [ ]1，T2]If the current air suction superheat degree is not satisfied, adjusting the rotating speed of the outer fan according to the current air suction superheat degree, and adjusting the rotating speed of the original outer fan to be in operation delta t according to a formula 22And returning to the step 31 after the time length standby group is stabilized, and repeating the steps.
Figure BDA0003383705710000201
In equation 2, Δ n is of the outer fanAdjustment of the rotational speed, a4Is a proportionality coefficient, TisIs the compressor suction temperature, TeIs the evaporation temperature.
Step S440, if the outdoor temperature of the machine room refrigerating system is greater than the sum of the set temperature and the set temperature multiplied by the set factor, determining the operation mode of the machine room refrigerating system again according to the outdoor temperature of the machine room refrigerating system.
And S450, if the outdoor temperature of the machine room refrigerating system is less than or equal to the sum of the set temperature and the set temperature multiplied by the set factor, re-adjusting the air suction temperature and the evaporation temperature of the machine room refrigerating system, and adjusting the rotating speed of an external fan of the machine room refrigerating system.
Fig. 5 is a flowchart illustrating an embodiment of a method for controlling air pump mode presetting of a machine room refrigeration system. As shown in fig. 3 and 5, an air pump mode presetting control method for a machine room refrigerating system includes:
step 31, when the unit of the machine room refrigeration system operates in the air pump mode, firstly, the rotating speed of the external fan is adjusted to a set rotating speed n0Meanwhile, the opening degree of the throttling method is adjusted to be maximum, and the set time length t is operated2And then, the operation mode of the compressor is switched to the air pump mode, so that the compressor can stably operate in the air pump mode.
And step 32, adjusting the rotating speed of the outer fan according to a preset method of the unit to maintain the stable operation of the unit, detecting whether the outdoor temperature is higher than the sum of the set temperature T and the set temperature T which is a set coefficient times delta, namely T + delta T, and if the outdoor temperature is less than or equal to T + delta T, continuously adjusting the rotating speed of the outer fan according to the preset method of the unit to maintain the stable operation of the unit. And if the outdoor temperature is greater than T + delta T, mode judgment is carried out again to enable the unit to be converted into a refrigeration mode to operate.
In this embodiment, after the unit is stably operated, the determination condition for switching the operation mode is set to T ± δ T to ensure that the operation mode of the unit is frequently switched when the outdoor temperature fluctuates in a range near T, thereby destroying the stable operation state of the unit, and therefore, a fluctuation interval of [ T- δ T, T + δ T ] is set to avoid the occurrence of unstable operation of the unit caused by frequent switching of the operation mode of the unit.
The embodiment selects the suction superheat as the specific control parameter, and the control parameter includes but is not limited to suction superheat, discharge temperature and other such control parameters of the refrigeration system.
In the scheme of the invention, the air pump technology is adopted, a special control strategy needs to be designed for the starting of the unit and the selection of the operation mode, and the stable and safe operation of the unit can be ensured. The stable starting and running of the annual refrigeration of the air pump unit are realized by designing a special control strategy of the refrigeration system with the air pump equipment. That is to say, the scheme of the invention adopts a special control strategy of the refrigeration system with the air pump equipment, and solves the problem of operation fluctuation of the air pump unit under the characteristic working condition, thereby obtaining the stable starting and operation effects of year-round refrigeration of the air pump unit.
Since the processes and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the air pump refrigeration system, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the embodiment, the combination arrangement form of the air pump and the compressor is sampled in the machine room refrigeration system, and after the machine room refrigeration system is started, the refrigeration mode and the air pump mode of the compressor are controlled to switch to operate according to the outdoor temperature, so that the machine room refrigeration system can be stably started and normally operated.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a control device of computer lab refrigerating system which characterized in that, computer lab air conditioning system includes: a compressor unit, an evaporator (5), a throttling unit and a condenser (2); the compressor unit forms a refrigeration circuit through the evaporator (5), the throttling unit and the condenser (2); the compressor unit includes: a compressor and an air pump;
the control device of the machine room refrigerating system comprises: a sampling unit and a control unit; wherein the content of the first and second substances,
the control unit is configured to control the compressor to start and adjust the opening degree of the throttling unit to a first set opening degree;
the sampling unit is configured to sample the outdoor temperature of the machine room refrigeration system after the compressor runs for a first set time;
the control unit is further configured to determine an operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system so as to control the machine room refrigeration system to switch between a set refrigeration mode and a set air pump mode.
2. The control device of the machine room refrigeration system according to claim 1, wherein,
in the compressor unit, the compressor and the air pump are integrally arranged or arranged in parallel; in the case where the compressor and the air pump are integrally provided, the compressor and the air pump form a compressor-integrated apparatus (1);
and/or the presence of a gas in the gas,
the throttling unit includes: the electronic expansion valves are independently arranged or the electronic expansion valve modules are arranged in parallel; the electronic expansion valve module arranged in parallel comprises two electronic expansion valves arranged in parallel, or an electronic expansion valve and an electromagnetic valve arranged in parallel, or an electronic expansion valve and an electric flow regulating valve arranged in parallel.
3. The control device for the machine room refrigeration system according to claim 1 or 2, wherein the control unit determines the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system, and comprises:
determining whether the outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature;
if the outdoor temperature of the machine room refrigerating system is less than or equal to the set temperature, controlling the machine room refrigerating system to operate in a set air pump mode;
and if the outdoor temperature of the machine room refrigerating system is higher than the set temperature, controlling the machine room refrigerating system to operate in a set refrigerating mode.
4. The control device for the machine room refrigeration system as claimed in claim 3, wherein the control unit controls the machine room refrigeration system to operate in a set refrigeration mode, and comprises:
adjusting the rotating speed of an external fan of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system and the frequency of a compressor; adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system;
adjusting the opening degree of a throttling unit of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system;
if the outdoor temperature of the machine room refrigeration system is smaller than the difference between the set temperature and the set temperature multiplied by the set factor, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system;
if the outdoor temperature of the machine room refrigerating system is larger than or equal to the difference between the set temperature and the set temperature multiplied by the set factor, adjusting the opening degree of a throttling unit of the machine room refrigerating system again according to the suction temperature and the evaporation temperature of the machine room refrigerating system;
wherein the content of the first and second substances,
the control unit adjusts the rotating speed of an outer fan of the machine room refrigerating system according to the outdoor temperature and the compressor frequency of the machine room refrigerating system, and comprises:
determining the sum of a first temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system and a first frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the rotating speed of an outer fan of the machine room refrigerating system, and controlling the outer fan of the machine room refrigerating system to operate according to the rotating speed of the outer fan;
the control unit adjusts the opening degree of the throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system, and comprises the following components:
determining the sum of a second temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system, a third temperature proportional coefficient multiple of the indoor temperature of the machine room refrigerating system and a second frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the opening degree of the throttling unit of the machine room refrigerating system, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree;
the control unit adjusts the opening degree of a throttling unit of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system, and comprises:
and determining the opening degree of a throttling unit of the machine room refrigerating system as the fourth set temperature coefficient times of the difference between the suction temperature of the machine room refrigerating system, the evaporation temperature of the machine room refrigerating system and half of the sum of the upper limit and the lower limit of the set temperature interval, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
5. The control device for the machine room refrigeration system according to claim 3, wherein the control unit controls the machine room refrigeration system to operate in the set air pump mode, and comprises:
adjusting the rotating speed of an external fan of the machine room refrigerating system to a first set rotating speed; adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree;
after the machine room refrigeration system is controlled to operate for a second set time, the operation mode of the compressor unit is switched from the refrigeration mode in which the compressor participates in operation to the air pump mode in which the air pump participates in operation;
adjusting the rotating speed of an external fan of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system;
if the outdoor temperature of the machine room refrigeration system is greater than the sum of the set temperature and the set temperature multiplied by the set coefficient, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system;
if the outdoor temperature of the machine room refrigerating system is less than or equal to the sum of the set temperature and the set temperature multiplied by the set coefficient, the suction temperature and the evaporation temperature of the machine room refrigerating system are increased again, and the rotating speed of an external fan of the machine room refrigerating system is adjusted;
wherein, the control unit, computer lab refrigerating system's the temperature of breathing in and evaporating temperature adjust computer lab refrigerating system's outer fan rotational speed includes:
and determining the rotation speed of an external fan of the machine room refrigeration system as a fifth set temperature coefficient times the difference between the suction temperature of the machine room refrigeration system, the evaporation temperature of the machine room refrigeration system and half of the sum of the upper limit and the lower limit of a set temperature interval, and controlling the external fan of the machine room refrigeration system to operate according to the rotation speed of the external fan.
6. A machine room refrigeration system, comprising: control device of a machine room refrigeration system according to any of claims 1 to 5.
7. A control method of a machine room refrigerating system is characterized in that the machine room air conditioning system comprises the following steps: a compressor unit, an evaporator (5), a throttling unit and a condenser (2); the compressor unit forms a refrigeration circuit through the evaporator (5), the throttling unit and the condenser (2); the compressor unit includes: a compressor and an air pump;
the control method of the machine room refrigerating system comprises the following steps:
controlling the compressor to start, and adjusting the opening degree of the throttling unit to a first set opening degree;
sampling the outdoor temperature of the machine room refrigerating system after the compressor runs for a first set time;
and determining the operation mode of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system so as to control the machine room refrigerating system to switch between the set refrigerating mode and the set air pump mode for operation.
8. The control method of the machine room refrigeration system according to claim 7, wherein,
determining the operation mode of the machine room refrigeration system according to the outdoor temperature of the machine room refrigeration system, wherein the operation mode comprises the following steps:
determining whether the outdoor temperature of the machine room refrigeration system is less than or equal to a set temperature;
if the outdoor temperature of the machine room refrigerating system is less than or equal to the set temperature, controlling the machine room refrigerating system to operate in a set air pump mode;
if the outdoor temperature of the machine room refrigerating system is higher than the set temperature, controlling the machine room refrigerating system to operate in a set refrigerating mode;
and/or the presence of a gas in the gas,
controlling the machine room refrigeration system to operate in a set refrigeration mode, comprising:
adjusting the rotating speed of an external fan of the machine room refrigerating system according to the outdoor temperature of the machine room refrigerating system and the frequency of a compressor; adjusting the opening of a throttling unit of the machine room refrigerating system according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system;
adjusting the opening degree of a throttling unit of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system;
if the outdoor temperature of the machine room refrigeration system is smaller than the difference between the set temperature and the set temperature multiplied by the set factor, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system;
if the outdoor temperature of the machine room refrigerating system is larger than or equal to the difference between the set temperature and the set temperature multiplied by the set factor, adjusting the opening degree of a throttling unit of the machine room refrigerating system again according to the suction temperature and the evaporation temperature of the machine room refrigerating system;
and/or the presence of a gas in the gas,
controlling the machine room refrigeration system to operate in a set air pump mode, comprising:
adjusting the rotating speed of an external fan of the machine room refrigerating system to a first set rotating speed; adjusting the opening degree of a throttling unit of the machine room refrigerating system to a set maximum opening degree;
after the machine room refrigeration system is controlled to operate for a second set time, the operation mode of the compressor unit is switched from the refrigeration mode in which the compressor participates in operation to the air pump mode in which the air pump participates in operation;
adjusting the rotating speed of an external fan of the machine room refrigerating system according to the air suction temperature and the evaporation temperature of the machine room refrigerating system;
if the outdoor temperature of the machine room refrigeration system is greater than the sum of the set temperature and the set temperature multiplied by the set coefficient, determining the operation mode of the machine room refrigeration system again according to the outdoor temperature of the machine room refrigeration system;
and if the outdoor temperature of the machine room refrigerating system is less than or equal to the sum of the set temperature and the set temperature multiplied by the set coefficient, the suction temperature and the evaporation temperature of the machine room refrigerating system are increased again, and the rotating speed of an external fan of the machine room refrigerating system is adjusted.
9. The control method of the machine room refrigeration system according to claim 8, wherein,
according to the outdoor temperature and the compressor frequency of the machine room refrigerating system, the rotating speed of an outer fan of the machine room refrigerating system is adjusted, and the method comprises the following steps:
determining the sum of a first temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system and a first frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the rotating speed of an outer fan of the machine room refrigerating system, and controlling the outer fan of the machine room refrigerating system to operate according to the rotating speed of the outer fan;
according to the outdoor temperature, the indoor temperature and the compressor frequency of the machine room refrigerating system, the opening degree of a throttling unit of the machine room refrigerating system is adjusted, and the method comprises the following steps:
determining the sum of a second temperature proportional coefficient multiple of the outdoor temperature of the machine room refrigerating system, a third temperature proportional coefficient multiple of the indoor temperature of the machine room refrigerating system and a second frequency proportional coefficient multiple of the compressor frequency of the machine room refrigerating system as the opening degree of the throttling unit of the machine room refrigerating system, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree;
according to computer lab refrigerating system's temperature of breathing in and evaporating temperature, adjust the aperture of computer lab refrigerating system's throttle unit, include:
and determining the opening degree of a throttling unit of the machine room refrigerating system as the fourth set temperature coefficient times of the difference between the suction temperature of the machine room refrigerating system, the evaporation temperature of the machine room refrigerating system and half of the sum of the upper limit and the lower limit of the set temperature interval, and controlling the throttling unit of the machine room refrigerating system to operate according to the opening degree.
10. The control method of the machine room refrigerating system according to claim 8, wherein adjusting the rotation speed of the external fan of the machine room refrigerating system according to the suction temperature and the evaporation temperature of the machine room refrigerating system comprises:
and determining the rotation speed of an external fan of the machine room refrigeration system as a fifth set temperature coefficient times the difference between the suction temperature of the machine room refrigeration system, the evaporation temperature of the machine room refrigeration system and half of the sum of the upper limit and the lower limit of a set temperature interval, and controlling the external fan of the machine room refrigeration system to operate according to the rotation speed of the external fan.
CN202111444849.4A 2021-11-30 2021-11-30 Control device and method of machine room refrigerating system and machine room refrigerating system Pending CN114165893A (en)

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CN108119996A (en) * 2017-12-15 2018-06-05 广东美的制冷设备有限公司 Air conditioner blower control method, electronic equipment and computer readable storage medium
CN109357443A (en) * 2018-10-18 2019-02-19 宁波奥克斯电气股份有限公司 A kind of electronic expansion valve opening control method, device and multi-line system
CN111928454A (en) * 2020-07-31 2020-11-13 海信（山东）空调有限公司 Air conditioner and control method thereof
CN113187726A (en) * 2021-05-06 2021-07-30 珠海格力电器股份有限公司 Compression mechanism, rotor compressor and air conditioner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005315469A (en) * 2004-04-27 2005-11-10 Mitsubishi Electric Corp Refrigerating cycle device
CN103512145A (en) * 2012-06-19 2014-01-15 珠海格力电器股份有限公司 Adjusting method and adjusting device of electronic expansion valve for air conditioning unit
CN107166642A (en) * 2017-05-16 2017-09-15 四川长虹电器股份有限公司 DC fan control method outside a kind of convertible frequency air-conditioner room
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