CN114151871B - Air conditioning system and cooling control device and method of frequency conversion module of air conditioning system - Google Patents

Air conditioning system and cooling control device and method of frequency conversion module of air conditioning system Download PDF

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Publication number
CN114151871B
CN114151871B CN202111449767.9A CN202111449767A CN114151871B CN 114151871 B CN114151871 B CN 114151871B CN 202111449767 A CN202111449767 A CN 202111449767A CN 114151871 B CN114151871 B CN 114151871B
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module
cooling
temperature
frequency conversion
conversion module
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CN114151871A (en
Inventor
马进军
张士兵
尚瑞
李天阳
荆莹
黄昌成
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/24—Cooling of electric components
    • 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
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a cooling control device and method for a variable frequency module in an air conditioning system and the air conditioning system, wherein the device comprises: a control unit determining an operation mode of the air conditioning system; the acquisition unit is used for acquiring the operation parameters of the air conditioning system in the operation mode; the control unit is used for controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operation parameters of the air conditioning system in the operation mode so as to realize the cooling control of the frequency conversion module; the first cooling throttling module is arranged in a first refrigerant pipeline, the second cooling throttling module is arranged in a second refrigerant pipeline, the first refrigerant pipeline is connected with the refrigerant pipeline where the cooling module is located in series, and the second refrigerant pipeline is connected with the refrigerant pipeline where the first cooling throttling module and the cooling module are located together in parallel. According to the scheme, the refrigerant quantity of the cooling flow path of the frequency conversion module is adjusted as required, and the problem that dew condensation is easy to occur on the surface of the frequency conversion module under the conditions of high ambient temperature and high ambient humidity can be avoided.

Description

Air conditioning system and cooling control device and method of frequency conversion module of air conditioning system
Technical Field
The invention belongs to the technical field of air conditioning systems, and particularly relates to a cooling control device and method for a variable frequency module in an air conditioning system and the air conditioning system, in particular to a control device and method for a variable frequency module cooling system in the air conditioning system and the air conditioning system.
Background
With the gradual development of air conditioning system technology, the variable frequency air conditioning system technology is widely applied in the air conditioning system industry. However, in the electric control system of the compressor driving board of the inverter air conditioning system, components in the inverter module, such as an IGBT (insulated gate bipolar transistor) module and an IPM (intelligent power module) module, generate a large amount of heat, and when the air conditioning system operates in an environment with a high temperature, the compressor has to be frequency limited, the inverter module operates in a frequency reducing manner, and even the air conditioning system is shut down due to an excessively high temperature of the inverter module.
In the heat dissipation mode of the frequency conversion module, most of the heat dissipation modes adopt the mode that the fan of the outdoor unit for air convection blows over the metal heat dissipation fins of the frequency conversion module to dissipate heat for components, but the heat dissipation effect of the heat dissipation mode is poor, when the outdoor environment temperature is high, the normal operation of the air conditioning system is ensured by the modes of frequency limiting, frequency reducing and even shutdown of the compressor, so that the refrigeration effect of the frequency conversion air conditioning system when the outdoor temperature is high is greatly influenced, and the use experience of the air conditioning system is poor. Therefore, in order to achieve a better heat dissipation effect, a metal heat sink with a larger surface area is required to ensure the heat dissipation effect, which results in a larger space occupied by the heat sink and higher cost. In addition, this cooling method is carrying out the in-process of heat transfer with external humid air, and the humid air of having of a specified duration can make the emergence of the condition such as fin surface oxidation, production condensation water, and then influences this radiating effect of cooling method and air conditioning system's life.
The other heat dissipation mode of the frequency conversion module is that a refrigerant pipe is led into a refrigerant of a circulating system of the air conditioning system, the refrigerant pipe is in contact with the metal radiating fin, heat emitted by components in the frequency conversion module is conducted to the metal radiating fin, and then the heat on the metal radiating fin is taken away through the refrigerant in the refrigerant pipe, so that the purpose of dissipating heat of the components in the frequency conversion module is achieved. The radiating mode has good radiating effect, small occupied space of the metal radiating fins and compact structure. However, when the metal heat sink and the circuit board attached to the metal heat sink are cooled by the cooling method under the conditions of high ambient temperature and high ambient humidity, the temperature of the metal heat sink is lower than the dew point temperature of air, so that the dewing phenomenon occurs on the circuit board, and the circuit board is short-circuited in severe cases, thereby burning out the circuit board.
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 cooling control device and method of a frequency conversion module in an air conditioning system and the air conditioning system, which are used for solving the problem that the surface of the frequency conversion module is easy to dewe under the conditions of high ambient temperature and high ambient humidity by directly installing the frequency conversion module on a refrigerant main circuit when a cooling flow path is formed by a refrigerant to dissipate heat of the frequency conversion module in the air conditioning system, and achieving the effect of avoiding the surface of the frequency conversion module from being easy to dewe under the conditions of high ambient temperature and high ambient humidity by adjusting the amount of the refrigerant in the cooling flow path of the frequency conversion module according to needs.
The invention provides a cooling control device of a variable frequency module in an air conditioning system, wherein the variable frequency module in the air conditioning system is provided with a heat dissipation plate; part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate to realize heat dissipation of the frequency conversion module; the cooling module of the frequency conversion module is formed by the cooling plate and part of the refrigerant pipeline which can exchange heat with the cooling plate; in the air conditioning system, a throttling unit is also arranged; the throttling unit comprises: a first cooling throttle module and a second cooling throttle module; the first cooling throttling module is arranged in the first refrigerant pipeline; the second cooling throttling module is arranged in a second refrigerant pipeline; the first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located; the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located; the cooling control device of the frequency conversion module in the air conditioning system comprises: the device comprises a collecting unit and a control unit; wherein the control unit is configured to determine an operation mode of the air conditioning system; the acquisition unit is configured to acquire the operation parameters of the air conditioning system in the operation mode; the control unit is further configured to control the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operation parameters of the air conditioning system in the operation mode, so as to realize cooling control of the frequency conversion module.
In some embodiments, an outdoor unit of the air conditioning system includes: the system comprises a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a flash evaporator and a filter; the exhaust port of the compressor is communicated with the first end of the outdoor heat exchanger and the first end of the indoor heat exchanger respectively after passing through the four-way valve; the second end of the outdoor heat exchanger is communicated to the first end of the flash evaporator; the second end of the flash evaporator is communicated to an air supplementing port of the compressor; the third end of the flash evaporator is divided into two paths, one path of the flash evaporator is communicated to the first end of the filter after passing through the cooling module and the first cooling throttling module, and the other path of the flash evaporator is communicated to the first end of the filter after passing through the second cooling throttling module; and the second end of the filter is communicated to the second end of the indoor heat exchanger.
In some embodiments, the first cooling throttling module and the second cooling throttling module are electronic expansion valves.
In some embodiments, the operation mode is a heating mode or a cooling mode; the operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator in the air-conditioning system; the temperature of the frequency conversion module is recorded as the temperature of the frequency conversion module; the temperature of a flash evaporator in the air-conditioning system is recorded as the temperature of the flash evaporator; the operation parameters in the refrigeration mode comprise: the temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system; and recording the temperature of the frequency conversion module as the temperature of the frequency conversion module.
In some embodiments, the control unit, in the cooling mode, controls an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to realize cooling control over the inverter module, and includes: if the temperature of the frequency conversion module is lower than the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be decreased, controlling the opening degree of the second cooling throttling module to be increased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the environment dew point temperature and lower than a set temperature; and if the temperature of the frequency conversion module is greater than or equal to the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously acquiring the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is greater than the environment dew point temperature and less than a set temperature.
In some embodiments, the control unit, in the heating mode, controls an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to realize cooling control over the inverter module, and includes: if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be reduced, continuously collecting the temperature of the frequency conversion module, and stopping regulating the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature; and if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously acquiring the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and less than a set temperature.
In accordance with another aspect of the present invention, there is provided an air conditioning system including: the cooling control device of the frequency conversion module in the air conditioning system is described above.
In another aspect, the present invention provides a cooling control method for an inverter module in an air conditioning system, where the inverter module in the air conditioning system has a heat sink; part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate to realize heat dissipation of the frequency conversion module; the cooling module of the frequency conversion module is formed by the cooling plate and part of the refrigerant pipeline which can exchange heat with the cooling plate; in the air conditioning system, a throttling unit is also arranged; the throttling unit includes: a first cooling throttle module and a second cooling throttle module; the first cooling throttling module is arranged in the first refrigerant pipeline; the second cooling throttling module is arranged in a second refrigerant pipeline; the first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located; the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located; the cooling control method of the frequency conversion module in the air conditioning system comprises the following steps: determining an operation mode of the air conditioning system; collecting operating parameters of the air conditioning system in the operating mode; and controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operating parameters of the air conditioning system in the operating mode so as to realize cooling control of the frequency conversion module.
In some embodiments, the operation mode is a heating mode or a cooling mode; the operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator in the air-conditioning system; the temperature of the frequency conversion module is recorded as the temperature of the frequency conversion module; the temperature of a flash evaporator in the air-conditioning system is recorded as the temperature of the flash evaporator; the operating parameters in the cooling mode include: the temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system; and recording the temperature of the frequency conversion module as the temperature of the frequency conversion module.
In some embodiments, in the cooling mode, controlling an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode to realize cooling control over the inverter module includes: if the temperature of the frequency conversion module is lower than the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be decreased, controlling the opening degree of the second cooling throttling module to be increased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the environment dew point temperature and lower than a set temperature;
and if the temperature of the frequency conversion module is greater than or equal to the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module until the temperature of the frequency conversion module is greater than the environment dew point temperature and less than a set temperature, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module.
In some embodiments, in the heating mode, controlling an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode to realize cooling control over the inverter module includes: if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be reduced, continuously collecting the temperature of the frequency conversion module, and stopping regulating the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature; and if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and is less than a set temperature.
Therefore, according to the scheme of the invention, the frequency conversion module in the air-conditioning system is connected in series and in parallel on the refrigerant pipeline by utilizing the two throttling elements (such as the electronic expansion valve), and the surface temperature of the frequency conversion module is controlled by adjusting the opening degrees of the two throttling elements, so that the surface of the frequency conversion module is prevented from being easily dewed under the conditions of high environmental temperature and high environmental humidity by adjusting the refrigerant quantity of the cooling flow path of the frequency conversion module according to needs.
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 the 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 cooling control apparatus for a frequency conversion module in an air conditioning system according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of an air conditioning system according to the present invention;
FIG. 3 is a schematic front view illustrating a frequency conversion module of an embodiment of an air conditioning system according to the present invention;
FIG. 4 is a flowchart illustrating an embodiment of a control method of an air conditioning system according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a 4G wireless data transmission module in the air conditioning system according to the present invention;
fig. 6 is a flowchart illustrating a cooling control method for a frequency conversion module in an air conditioning system according to an embodiment of the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
1-a compressor; 2-oil content; 3-a four-way valve; 4-outdoor heat exchanger; 5-a filter; 6-a first electronic expansion valve; 7-a filter; 8-a flash evaporator; 9-air supplement valve; 10-a second electronic expansion valve; 11-a heat sink; 12-heat sink bulb; 13-a third electronic expansion valve; 14-a filter; 15-a fourth electronic expansion valve; 16-a filter; 17-indoor double pipe heat exchanger; 18-a water pump; 19-a gas-liquid separator; 20-flash evaporator temperature sensing bulb; 21-frequency conversion module pipeline; 22-PCB board where the frequency conversion module is located.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In some schemes, the refrigerant in the air conditioning system is used for cooling the compressor variable frequency driving module, so that the heat dissipation efficiency of the compressor variable frequency driving module is improved, and the use effect of the air conditioning system in a high-temperature environment is enhanced. However, the proposal does not consider the occurrence of the condition that the frequency conversion driving module is burnt out due to dewing when the temperature of the frequency conversion driving module is lower than the dew point temperature of air when the air conditioning system uses the refrigerant to cool the frequency conversion driving module under the condition of high temperature and high humidity.
According to some schemes, the flow of a refrigerant used for cooling the frequency converter is controlled by a cooling pump, so that the heat dissipation of the frequency converter is achieved, and the phenomenon of condensation caused by too low surface temperature of the frequency converter is avoided. However, in the scheme, the cooling pump and the control module for controlling the frequency of the cooling pump are added, so that the system is more complex and higher in cost.
According to some schemes, the refrigerant in the air-conditioning system is used for dissipating heat of the compressor variable-frequency driving module, so that the running performance of the air-conditioning system is improved. However, according to the scheme, the compressor variable-frequency driving module is arranged at the position behind the electronic expansion valve, when the air conditioning system operates in a refrigeration mode, the temperature of a refrigerant throttled by the electronic expansion valve is low, the temperature of the variable-frequency module is easily lower than the dew point temperature of air, and the risk of dewing on the surface of a circuit board of the variable-frequency module is increased.
According to some schemes, the heat dissipation module is connected with the parallel branch of the refrigerant flow path, and then the refrigerant flow flowing through the heat dissipation module is adjusted by adjusting the opening degree of the electromagnetic valve of the parallel branch, so that the temperature of the surface of the heat dissipation module is higher than the dew point temperature of air, and the condensation water generated on the surface of the frequency conversion module is avoided. However, the electromagnetic valve is arranged on the main path of the refrigerant flow path, so that the opening degree of the electromagnetic valve is frequently adjusted, and the service life of the electromagnetic valve is shortened; in addition, frequent adjustment of the opening degree of the electromagnetic valve of the main refrigerant path can cause oscillation fluctuation of the refrigerant flow of the air conditioning system, so that the stable operation of the air conditioning system is not facilitated, and the difficulty of adjusting the air conditioning system to the required state parameters is increased.
According to an embodiment of the present invention, there is provided a cooling control apparatus of a frequency conversion module in an air conditioning system. Referring to fig. 1, a schematic structural diagram of an embodiment of a cooling control device of a frequency conversion module in an air conditioning system according to the present invention is shown. The frequency conversion module in the air conditioning system is provided with a heat dissipation plate 11. And part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate 11 to realize heat dissipation of the frequency conversion module. The heat dissipation plate 11 and a part of the refrigerant pipeline capable of exchanging heat with the heat dissipation plate 11 form a cooling module of the frequency conversion module. In the air conditioning system, a throttling unit is further provided. Particularly, a throttling unit is arranged at a cooling module of the frequency conversion module. The throttling unit comprises: a first cooling throttle module and a second cooling throttle module. The first cooling throttling module is arranged in the first refrigerant pipeline. And the second cooling throttling module is arranged in a second refrigerant pipeline. The first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located. And the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located. A first cooling throttle module, such as a second electronic expansion valve 10. A second cooling throttle module, such as a third electronic expansion valve 13.
The cooling control device of the frequency conversion module in the air conditioning system comprises: the device comprises a collecting unit and a control unit. A collection unit, such as a bulb. A control unit, such as a controller of an air conditioning system.
Wherein the control unit is configured to determine an operation mode of the air conditioning system.
The acquisition unit is configured to acquire the operation parameters of the air conditioning system in the operation mode.
The control unit is further configured to control the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operation parameters of the air conditioning system in the operation mode so as to realize cooling control on the frequency conversion module.
In view of the fact that the inverter module is directly mounted on the main refrigerant path in the past for cooling the inverter module, the flow rate of the refrigerant actually required for cooling the inverter module is very small. The scheme of the invention provides a frequency conversion module cooling system in an air conditioning system, wherein the frequency conversion module is connected in series and in parallel on a refrigerant pipeline through two electronic expansion valves, a liquid refrigerant of a circulating system is introduced, and heat dissipation is carried out on a driving plate power module. And the opening degree of the two electronic expansion valves is adjusted to realize the accurate control and management of the surface temperature of the frequency conversion module, and the refrigerant flow of the cooling branch of the drive plate is adjusted by self-feedback through detecting the temperature of the drive plate, so that the drive plate and the surrounding area of the drive plate are prevented from being supercooled to cause condensation. That is to say, by adding two electronic expansion valves, the heat dissipation plate can be connected in series in the refrigerant system or in parallel in the refrigerant system, so that the temperature of the heat dissipation plate can be kept within a reasonable range by simultaneously controlling the opening degrees of the two electronic expansion valves, the temperature of the heat dissipation plate can be accurately controlled, and the influence of the opening degrees of the electronic expansion valves on the refrigerant circulation quantity of the whole system can be avoided.
In some embodiments, an outdoor unit of the air conditioning system includes: compressor 1, four-way valve 3, outdoor heat exchanger 4, indoor heat exchanger, flash evaporator 8 and filter 14.
An exhaust port of the compressor 1 is communicated with a first end of the outdoor heat exchanger 4 and a first end of the indoor heat exchanger respectively after passing through the four-way valve 3. And the second end of the outdoor heat exchanger 4 is communicated to the first end of the flash evaporator 8. And a second end of the flash evaporator 8 is communicated to the air supplementing port of the compressor 1. The third end of the flash evaporator 8 is divided into two paths, one path is communicated to the first end of the filter 14 after passing through the cooling module and the first cooling throttling module, the other path is communicated to the first end of the filter 14 after passing through the second cooling throttling module. And a second end of the filter 14 is communicated to a second end of the indoor heat exchanger.
Fig. 2 is a schematic structural diagram of an embodiment of an air conditioning system according to the present invention. As shown in fig. 2, the air conditioning system includes: the system comprises a compressor 1, an oil component 2, a four-way valve 3, an outdoor heat exchanger 4, a filter 5, a first electronic expansion valve 6, a filter 7, a flash evaporator 8, an air compensating valve 9, a second electronic expansion valve 10, a heat dissipation plate 11, a heat dissipation plate temperature sensing bulb 12, a third electronic expansion valve 13, a filter 14, a fourth electronic expansion valve 15, a filter 16, an indoor double-pipe heat exchanger 17, a water pump 18, a gas-liquid separator 19, a flash evaporator temperature sensing bulb 20, a frequency conversion module pipeline 21 and a PCB 22 where a frequency conversion module is located.
In the example shown in fig. 2, the high-temperature and high-pressure gas generated by the compressor 1 enters the four-way valve 3 through the oil separator 2, enters the outdoor heat exchanger 4 for heat exchange, is filtered by the filter 5, is throttled by the first electronic expansion valve 6, is filtered by the filter 7, enters the flash evaporator 8, one path of the refrigerant coming out of the flash evaporator 8 enters the compressor 1 through the air compensating valve 9, passes through the frequency conversion module, passes through the second electronic expansion valve 10, passes through the third electronic expansion valve 13, passes through the filter 14, passes through the fourth electronic expansion valve 15, passes through the filter 16, enters the indoor double pipe heat exchanger 17 for heat exchange, passes through the four-way valve 3 again, enters the gas-liquid separator 19, and enters the compressor 1. The water in the indoor double pipe heat exchanger 17 exchanges heat with the refrigerant and is input to the end of the air conditioning system through the water pump 18.
In some embodiments, the first cooling throttling module and the second cooling throttling module are electronic expansion valves.
Fig. 3 is a schematic front view illustrating a frequency conversion module of an embodiment of an air conditioning system according to the present invention. As shown in fig. 3, the heat dissipation plate 11 is disposed on the PCB 22 where the inverter module is located, the inverter module pipeline 21 is disposed on the heat dissipation plate 11, the heat dissipation plate thermal bulb 12 is disposed on the heat dissipation plate 11, and the executing components are the second electronic expansion valve 10 and the third electronic expansion valve 13, and are used for adjusting the flow rate of the refrigerant of the inverter module branch.
In the scheme of the invention, the mode of connecting the frequency conversion module cooling flow path and the main path in series-parallel connection by adding a complex system of valves is adopted, so that the refrigerant flow of the frequency conversion module cooling flow path can be adjusted according to needs, the interference of the branch refrigerant flow to the whole refrigerant system is reduced, the purpose of easily controlling the temperature of surface components of the frequency conversion module is improved, and the problem that the surface of the frequency conversion module is easily subjected to dewing because the refrigerant flow of the frequency conversion module in the air-conditioning system can not be adjusted is solved.
In the scheme of the invention, the system pressure drop and the airflow sound caused by the cooling flow path of the frequency conversion module can be reduced by the connection scheme and the adjustable electronic expansion valve which are connected in series and in parallel, and the problems of the system pressure drop and the airflow sound caused by the cooling flow path of the frequency conversion module are solved.
In some embodiments, the operation mode is a heating mode or a cooling mode.
The operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator 8 in the air-conditioning system. And recording the temperature of the frequency conversion module as the temperature of the frequency conversion module. The temperature of the flash evaporator 8 in the air conditioning system is recorded as the temperature of the flash evaporator, such as a flash evaporator temperature bulb 20, and is used for detecting the flash evaporation temperature T Flashing 。
The operating parameters in the cooling mode include: the temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system. Wherein, the temperature of the frequency conversion module is recorded as the frequency conversion module temperature, such as the heat dissipation plate thermal bulb 12, and is used for detecting the temperature T of the frequency conversion module around the heat dissipation plate 11 Become 。
The invention also provides a control method of the frequency conversion module cooling system in the air conditioning system, which controls the opening degree of the electronic expansion valve by detecting the temperature of the heat dissipation plate near the frequency conversion module in the running process of the unit, thereby ensuring that the power components on the frequency conversion module are in a reasonable temperature range. And meanwhile, whether the surface of the frequency conversion module has the condensation condition is judged, and the condensation phenomenon caused by the excessively low surface temperature of the frequency conversion module is prevented by controlling the opening degree of an electronic expansion valve on a cooling branch of the frequency conversion module. According to the scheme of the invention, the function control is realized only by additionally arranging the electronic expansion valve and the heat-dissipating plate temperature sensing bulb, the parameters participating in the control are less, the cost is lower, and the control strategy is simple and reliable.
In some embodiments, the control unit, in the cooling mode, controls an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to realize cooling control over the inverter module, and includes: the process of cooling control on the frequency conversion module in the refrigeration mode specifically comprises any one of the following refrigeration control processes.
A first refrigeration control process: the control unit is specifically configured to control the opening degree of the first cooling and throttling module to be decreased and control the opening degree of the second cooling and throttling module to be increased if the temperature of the frequency conversion module is lower than the ambient dew point temperature, and continue to acquire the temperature of the frequency conversion module until the temperature of the frequency conversion module is higher than the ambient dew point temperature and lower than a set temperature, and stop adjusting the opening degrees of the first cooling and throttling module and the second cooling and throttling module, otherwise, continue to control the opening degree of at least one of the first cooling and throttling module and the second cooling and throttling module according to the operating parameters of the air conditioning system in the operating mode in the refrigeration mode, so as to realize cooling control of the frequency conversion module.
A second refrigeration control process: the control unit is specifically configured to control the opening degree of the first cooling throttling module to be increased and control the opening degree of the second cooling throttling module to be decreased if the temperature of the frequency conversion module is greater than or equal to the ambient dew point temperature, and continue to acquire the temperature of the frequency conversion module, and stop adjusting the opening degree of the first cooling throttling module and the opening degree of the second cooling throttling module until the temperature of the frequency conversion module is greater than the ambient dew point temperature and less than a set temperature, otherwise, continue to control the opening degree of at least one of the first cooling throttling module and the second cooling throttling module in the refrigeration mode according to the operating parameters of the air conditioning system in the operation mode, so as to realize cooling control over the frequency conversion module.
Fig. 4 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram illustrating a 4G wireless data transmission module in the air conditioning system according to an embodiment of the present invention. As shown in FIG. 5, the control unit acquires real-time data of local meteorological parameters through the 4G wireless data transmission module, and the control unit controls the relevant operation of the unit through the acquired dew point temperature of the external environment.
As shown in fig. 4, a control method of an air conditioning system includes:
step 1, determining an operation mode of an air conditioning system. The operation modes of the air conditioning system comprise a heating mode and a cooling mode. If the mode is the cooling mode, step 2 is executed. If the mode is the heating mode, step 3 is executed.
Step 2, if the operation mode of the air conditioning system is a refrigeration mode, namely, when the unit performs refrigeration operation, the 4G wireless data transmission module acquires the local environment dew point temperature T in real time Dew Let the frequency conversion module temperature be T Become The maximum upper limit value of the temperature when the frequency conversion module operates is set temperature T Is provided with 。
Wherein the local ambient dew point temperature T Dew The reference is a critical temperature value when the local ambient air is dewed, the dew will not be formed when the outdoor ambient temperature is higher than the dew point temperature, the dew will be formed when the outdoor ambient temperature is lower than the dew point temperature, and the dew point temperature is more accurate than the outdoor ambient temperature.
When the temperature T of the frequency conversion module Become <Local ambient dew point temperature T Dew And when the unit enters the frequency conversion module, the dew condensation risk is judged, the second electronic expansion valve 10 is adjusted to be small, and the third electronic expansion valve 13 is adjusted to be large according to the judgment condition. Detection ofTemperature T of frequency measurement and conversion module Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
When the temperature T of the frequency conversion module Become >Local ambient dew point temperature T Dew And then, opening the second electronic expansion valve 10 and reducing the third electronic expansion valve 13, increasing the branch refrigerant flow of the frequency conversion module, and fully cooling the frequency conversion module. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
In some embodiments, the control unit, in the heating mode, controls an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to realize cooling control over the inverter module, includes: the process of cooling control of the frequency conversion module in the heating mode specifically includes any one of the following heating control processes.
The first heating control process: the control unit is specifically configured to control the opening degree of the first cooling and throttling module to be decreased and control the opening degree of the second cooling and throttling module to be decreased if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, and continue to acquire the temperature of the frequency conversion module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature, and stop adjusting the opening degrees of the first cooling and throttling module and the second cooling and throttling module, otherwise, continue to control the opening degree of at least one of the first cooling and throttling module and the second cooling and throttling module according to the operating parameters of the air conditioning system in the operating mode in the heating mode, so as to realize cooling control over the frequency conversion module.
The second heating control process: the control unit is specifically configured to control the opening degree of the first cooling and throttling module to be increased and control the opening degree of the second cooling and throttling module to be decreased if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, and continue to acquire the temperature of the frequency conversion module, and stop adjusting the opening degrees of the first cooling and throttling module and the second cooling and throttling module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and less than a set temperature, otherwise, continue to control the opening degree of at least one of the first cooling and throttling module and the second cooling and throttling module in the heating mode according to the operating parameters of the air conditioning system in the operating mode, so as to realize cooling control over the frequency conversion module.
As shown in fig. 4, the control method of the air conditioning system further includes:
and 3, if the operation mode of the air conditioning system is a heating mode, namely when the unit is in heating operation, detecting the temperature of the flash evaporator 8 to obtain the temperature T of the flash evaporator Flashing Let the temperature T of the frequency conversion module Become The maximum upper limit value of the operating temperature of the frequency conversion module is set temperature T Is provided with 。
When the temperature T of the frequency conversion module Become <Temperature T of flash evaporator Flashing When the pressure is increased, the second electronic expansion valve 10 is decreased, and the third electronic expansion valve 13 is increased. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
When the temperature T of the frequency conversion module Become >Temperature T of flash evaporator Flashing And when the temperature of the first electronic expansion valve 10 is increased, the temperature of the second electronic expansion valve 13 is increased, and the temperature of the second electronic expansion valve is increased. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
In the scheme of the invention, the air conditioning system acquires local meteorological parameters in real time through the 4G wireless data transmission module and accurately judges the real-time dew point temperature of the external environment, so that the problem of dewing on the surface of the frequency conversion module is better solved, namely the problem of dewing on the surface of the frequency conversion module caused by inaccurate judgment of the dew point temperature is solved. Through the control logic of the reasonable design frequency conversion module, the problem that the surface of the frequency conversion module is easy to dewe due to overcooling is solved, the frequency conversion module is better suitable for extremely severe working conditions, and the running reliability of the unit is improved. Meanwhile, the problem that the cost of the air conditioning system is increased more due to the fact that the frequency conversion module achieves a good heat dissipation effect is solved.
By adopting the technical scheme of the invention, the frequency conversion module in the air-conditioning system is connected in series and in parallel on the refrigerant pipeline by utilizing the two throttling elements (such as the electronic expansion valve), and the control on the surface temperature of the frequency conversion module is realized by adjusting the opening degrees of the two throttling elements, so that the surface of the frequency conversion module is prevented from easily dewing under the conditions of higher environmental temperature and higher environmental humidity by adjusting the refrigerant quantity of the cooling flow path of the frequency conversion module according to the requirement.
According to the embodiment of the invention, the air conditioning system corresponding to the cooling control device of the frequency conversion module in the air conditioning system is also provided. The air conditioning system may include: the cooling control device of the frequency conversion module in the air conditioning system is described above.
Since the processing and functions of the air conditioning system of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus, 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 invention, the frequency conversion module in the air conditioning system is connected in series and in parallel on the refrigerant pipeline by utilizing two throttling elements (such as electronic expansion valves), the surface temperature of the frequency conversion module is controlled by adjusting the opening degrees of the two throttling elements, the problem that the surface of the frequency conversion module is easy to dewfall due to the fact that the flow of the refrigerant pipeline of the frequency conversion module in the air conditioning system is not adjustable is solved, and the running reliability of the unit is improved.
According to an embodiment of the present invention, there is also provided a cooling control method for a frequency conversion module in an air conditioning system corresponding to the air conditioning system, as shown in fig. 6, which is a schematic flow chart of an embodiment of the cooling control method for a frequency conversion module in an air conditioning system according to the present invention. The frequency conversion module in the air conditioning system is provided with a heat dissipation plate 11. And part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate 11 to realize heat dissipation of the frequency conversion module. The heat dissipation plate 11 and a part of the refrigerant pipeline capable of exchanging heat with the heat dissipation plate 11 form a cooling module of the frequency conversion module. In the air conditioning system, a throttling unit is further provided. The throttling unit includes: a first cooling throttle module and a second cooling throttle module. The first cooling throttling module is arranged in the first refrigerant pipeline. And the second cooling throttling module is arranged in a second refrigerant pipeline. The first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located. And the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located. A first cooling throttle module such as a second electronic expansion valve 10. A second cooling throttle module, such as a third electronic expansion valve 13.
The cooling control method of the frequency conversion module in the air conditioning system comprises the following steps: step S110 to step S130.
At step S110, an operation mode of the air conditioning system is determined.
At step S120, the operation parameters of the air conditioning system in the operation mode are collected.
At step S130, controlling an opening degree of at least one of the first cooling and throttling module and the second cooling and throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to implement cooling control on the inverter module.
In view of the above, the conventional inverter module is directly mounted on the main refrigerant path, but the flow rate of the refrigerant actually required for cooling the inverter module is very small. The scheme of the invention provides a frequency conversion module cooling system in an air conditioning system, wherein the frequency conversion module is connected in series and in parallel on a refrigerant pipeline through two electronic expansion valves, a liquid refrigerant of a circulating system is introduced, and heat dissipation is carried out on a driving plate power module. And the opening degree of the two electronic expansion valves is adjusted to realize the accurate control and management of the surface temperature of the frequency conversion module, and the flow of the refrigerant of the cooling branch of the drive plate is adjusted by self-feedback through the temperature detection of the drive plate, so that the drive plate and the surrounding thereof are prevented from being supercooled to cause condensation. That is to say, through adding two electronic expansion valves, the heat dissipation plate can be connected in series in the refrigerant system as well as in parallel in the refrigerant system, so that the temperature of the heat dissipation plate can be kept within a reasonable range by simultaneously controlling the opening degrees of the two electronic expansion valves, the temperature of the heat dissipation plate is accurately controlled, and the influence of the opening degrees of the electronic expansion valves on the refrigerant circulation volume of the whole system can be avoided.
Fig. 2 is a schematic structural diagram of an embodiment of an air conditioning system according to the present invention. As shown in fig. 2, the air conditioning system includes: the system comprises a compressor 1, an oil component 2, a four-way valve 3, an outdoor heat exchanger 4, a filter 5, a first electronic expansion valve 6, a filter 7, a flash evaporator 8, an air compensating valve 9, a second electronic expansion valve 10, a heat dissipation plate 11, a heat dissipation plate temperature sensing bulb 12, a third electronic expansion valve 13, a filter 14, a fourth electronic expansion valve 15, a filter 16, an indoor double-pipe heat exchanger 17, a water pump 18, a gas-liquid separator 19, a flash evaporator temperature sensing bulb 20, a frequency conversion module pipeline 21 and a PCB 22 where a frequency conversion module is located.
In the example shown in fig. 2, high-temperature and high-pressure gas generated by the compressor 1 enters the four-way valve 3 through the oil separator 2, enters the outdoor heat exchanger 4 for heat exchange, is filtered by the filter 5, is throttled by the first electronic expansion valve 6, is filtered by the filter 7, enters the flash evaporator 8, refrigerant discharged from the flash evaporator 8 enters the compressor 1 through the air make-up valve 9, passes through the frequency conversion module, passes through the second electronic expansion valve 10, passes through the third electronic expansion valve 13, passes through the filter 14, passes through the fourth electronic expansion valve 15, enters the indoor double pipe heat exchanger 17 for heat exchange through the filter 16, passes through the four-way valve 3 again, enters the gas-liquid separator 19, and enters the compressor 1. The water in the indoor double pipe heat exchanger 17 exchanges heat with the refrigerant and is input to the end of the air conditioning system through the water pump 18.
Fig. 3 is a schematic front view illustrating a frequency conversion module in an air conditioning system according to an embodiment of the present invention. As shown in fig. 3, the heat dissipation plate 11 is disposed on the PCB 22 where the frequency conversion module is located, the frequency conversion module pipeline 21 is disposed on the heat dissipation plate 11, the heat dissipation plate thermal bulb 12 is disposed on the heat dissipation plate 11, and the executing components are the second electronic expansion valve 10 and the third electronic expansion valve 13, and are configured to adjust the flow rate of the refrigerant of the branch of the frequency conversion module.
In the scheme of the invention, the refrigerant flow of the cooling flow path of the frequency conversion module can be adjusted according to the requirement by adding a complex system of valves to connect the cooling flow path of the frequency conversion module and the main path in series-parallel connection, thereby reducing the interference of the refrigerant flow of the branch path on the whole refrigerant system, improving the aim of easily controlling the temperature of surface components of the frequency conversion module, and solving the problem that the surface of the frequency conversion module is easy to dewfall due to the fact that the refrigerant flow of the frequency conversion module in the air-conditioning system can not be adjusted.
In the scheme of the invention, the system pressure drop and the airflow sound caused by the cooling flow path of the frequency conversion module can be reduced by the connection scheme and the adjustable electronic expansion valve which are connected in series and in parallel, and the problems of the system pressure drop and the airflow sound caused by the cooling flow path of the frequency conversion module are solved.
In some embodiments, the operation mode is a heating mode or a cooling mode.
The operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator 8 in the air-conditioning system. And recording the temperature of the frequency conversion module as the temperature of the frequency conversion module. The temperature of the flash evaporator 8 in the air conditioning system is recorded as the temperature of the flash evaporator, such as a flash evaporator temperature bulb 20, and is used for detecting the flash evaporation temperature T Flashing 。
The operating parameters in the cooling mode include: the above-mentionedThe temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system. Wherein, the temperature of the frequency conversion module is recorded as the frequency conversion module temperature, such as the heat dissipation plate thermal bulb 12, and is used for detecting the temperature T of the frequency conversion module around the heat dissipation plate 11 Become 。
The invention also provides a control method of the frequency conversion module cooling system in the air conditioning system, and in the running process of the unit, the opening degree of the electronic expansion valve is controlled by detecting the temperature of the heat dissipation plate near the frequency conversion module, so that the power components on the frequency conversion module are ensured to be in a reasonable temperature range. And meanwhile, whether the surface of the frequency conversion module has the condition of dewing or not is judged, and the dewing phenomenon caused by the excessively low surface temperature of the frequency conversion module is prevented by controlling the opening degree of an electronic expansion valve on a cooling branch of the frequency conversion module. According to the scheme of the invention, the function control is realized only by additionally arranging the electronic expansion valve and the heat-dissipating plate temperature sensing bulb, the parameters participating in the control are less, the cost is lower, and the control strategy is simple and reliable.
In some embodiments, in the cooling mode, in step S130, controlling an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode, so as to implement cooling control over the inverter module, includes: the process of cooling control on the frequency conversion module in the refrigeration mode specifically comprises any one of the following refrigeration control processes.
A first refrigeration control process: if the temperature of the frequency conversion module is smaller than the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be increased, continuously collecting the temperature of the frequency conversion module until the temperature of the frequency conversion module is larger than the environment dew point temperature and smaller than a set temperature, stopping adjusting the opening degree of the first cooling throttling module and the opening degree of the second cooling throttling module, and otherwise, continuously controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module in the refrigeration mode according to the operation parameters of the air conditioning system in the operation mode so as to realize cooling control on the frequency conversion module.
A second refrigeration control process: if the temperature of the frequency conversion module is greater than or equal to the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously acquiring the temperature of the frequency conversion module until the temperature of the frequency conversion module is greater than the environment dew point temperature and less than a set temperature, stopping adjusting the opening degree of the first cooling throttling module and the opening degree of the second cooling throttling module, and otherwise, continuously controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module in the refrigeration mode according to the operating parameters of the air conditioning system in the operating mode so as to realize cooling control on the frequency conversion module.
Fig. 4 is a flowchart illustrating an embodiment of a control method of an air conditioning system according to the present invention, and fig. 5 is a schematic structural diagram illustrating an embodiment of a 4G wireless data transmission module in the air conditioning system according to the present invention. As shown in FIG. 5, the control unit acquires real-time data of local meteorological parameters through the 4G wireless data transmission module, and the control unit controls the relevant operation of the unit through the acquired dew point temperature of the external environment.
As shown in fig. 4, the control method of the air conditioning system includes:
step 1, determining an operation mode of an air conditioning system. The operation modes of the air conditioning system comprise a heating mode and a cooling mode. If the mode is the cooling mode, step 2 is executed. If the mode is the heating mode, step 3 is executed.
Step 2, if the operation mode of the air conditioning system is a refrigeration mode, namely, when the unit performs refrigeration operation, the 4G wireless data transmission module acquires the local environmental dew point temperature T in real time Dew Let the frequency conversion module temperature be T Become The maximum upper limit value of the temperature when the frequency conversion module operates is set temperature T Is provided with 。
When the temperature T of the frequency conversion module Become <Local ambient dew point temperature T Dew When the unit enters the frequency conversion module, the dew condensation risk is judged, the second electronic expansion valve 10 is adjusted to be smaller and the second electronic expansion valve is adjusted to be larger according to the judgment conditionThree electronic expansion valves 13. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
When the temperature T of the frequency conversion module Become >Local ambient dew point temperature T Dew And then, opening the second electronic expansion valve 10 and reducing the third electronic expansion valve 13, increasing the branch refrigerant flow of the frequency conversion module, and fully cooling the frequency conversion module. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
In some embodiments, in the heating mode, in step S130, controlling an opening degree of at least one of the first cooling throttle module and the second cooling throttle module according to an operation parameter of the air conditioning system in the operation mode, so as to realize cooling control over the inverter module, includes: the process of cooling control of the frequency conversion module in the heating mode specifically comprises any one of the following heating control processes.
The first heating control process: if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be reduced, continuously collecting the temperature of the frequency conversion module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature, stopping adjusting the opening degree of the first cooling throttling module and the opening degree of the second cooling throttling module, and otherwise, continuously controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module in the heating mode according to the operation parameters of the air conditioning system in the operation mode so as to realize cooling control on the frequency conversion module.
The second heating control process: if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously acquiring the temperature of the frequency conversion module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and less than a set temperature, stopping adjusting the opening degree of the first cooling throttling module and the opening degree of the second cooling throttling module, and otherwise, continuously controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module in the heating mode according to the operating parameters of the air conditioning system in the operating mode so as to realize cooling control on the frequency conversion module.
As shown in fig. 4, the method for controlling an air conditioning system further includes:
step 3, if the operation mode of the air conditioning system is a heating mode, namely when the unit is in heating operation, detecting the temperature of the flash evaporator 8 to obtain the temperature T of the flash evaporator Flashing If the temperature T of the frequency conversion module Become The maximum upper limit value of the temperature when the frequency conversion module operates is set temperature T Is provided with 。
When the temperature T of the frequency conversion module Become <Temperature T of flash evaporator Flashing When the pressure is increased, the second electronic expansion valve 10 is decreased, and the third electronic expansion valve 13 is increased. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperature T Is provided with Time, frequency conversion module temperature T Become And when the target temperature range is met, the second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting. Otherwise, the adjustment is continued.
When the temperature T of the frequency conversion module Become >Temperature T of flash evaporator Flashing And when the temperature of the first electronic expansion valve 10 is increased, the temperature of the second electronic expansion valve 13 is increased, and the temperature of the second electronic expansion valve is increased. Detect frequency conversion module temperature T Become When local ambient dew point temperature T Dew <Temperature T of frequency conversion module Become <Set temperatureT Is provided with Time, frequency conversion module temperature T Become The second electronic expansion valve 10 and the third electronic expansion valve 13 stop adjusting when the target temperature range is satisfied. Otherwise, the adjustment is continued.
In the scheme of the invention, the air conditioning system acquires local meteorological parameters in real time through the 4G wireless data transmission module and accurately judges the real-time dew point temperature of the external environment, so that the problem of dew condensation on the surface of the frequency conversion module is better solved, namely the problem of dew condensation on the surface of the frequency conversion module caused by inaccurate judgment of the dew point temperature is solved. Through the control logic of reasonable design frequency conversion module, solve the frequency conversion module and make its surface easily dewfall's problem because of overcooling, make frequency conversion module adapt to extremely abominable operating mode better, improve the reliability of unit operation. Meanwhile, the problem that the cost of the air conditioning system is increased more due to the fact that the frequency conversion module achieves a good heat dissipation effect is solved.
Since the processing and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles and examples of the air conditioning system, 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 embodiment, the frequency conversion module in the air-conditioning system is connected in series and in parallel on the refrigerant pipeline by utilizing the two throttling elements (such as the electronic expansion valve), the control on the surface temperature of the frequency conversion module is realized by adjusting the opening degrees of the two throttling elements, the dewing phenomenon caused by the over-low surface temperature of the frequency conversion module is prevented by controlling the opening degree of the electronic expansion valve on the cooling branch of the frequency conversion module, the cost is low, and the control strategy is simple and reliable.
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 (8)

1. A cooling control device of an inverter module in an air conditioning system is characterized in that the inverter module in the air conditioning system is provided with a heat dissipation plate (11); part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate (11) to realize heat dissipation of the frequency conversion module; the cooling module of the frequency conversion module is formed by the heat dissipation plate (11) and a part of pipelines capable of exchanging heat with the heat dissipation plate (11) in the refrigerant pipeline; in the air conditioning system, a throttling unit is also arranged; the throttling unit comprises: a first cooling throttle module and a second cooling throttle module; the first cooling throttling module is arranged in the first refrigerant pipeline; the second cooling throttling module is arranged in a second refrigerant pipeline; the first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located; the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located; the outdoor unit of the air conditioning system includes: the system comprises a compressor (1), a four-way valve (3), an outdoor heat exchanger (4), an indoor heat exchanger, a flash evaporator (8) and a filter (14); an exhaust port of the compressor (1) is communicated with a first end of the outdoor heat exchanger (4) and a first end of the indoor heat exchanger respectively after passing through the four-way valve (3); the second end of the outdoor heat exchanger (4) is communicated to the first end of the flash evaporator (8); the second end of the flash evaporator (8) is communicated to an air supplementing port of the compressor (1); the third end of the flash evaporator (8) is divided into two paths, one path of the flash evaporator passes through the cooling module and the first cooling throttling module and then is communicated to the first end of the filter (14), and the other path of the flash evaporator passes through the second cooling throttling module and then is communicated to the first end of the filter (14); a second end of the filter (14) being connected to a second end of the indoor heat exchanger;
the cooling control device of the frequency conversion module in the air conditioning system comprises: the device comprises a collecting unit and a control unit; wherein the content of the first and second substances,
the control unit configured to determine an operation mode of the air conditioning system;
the acquisition unit is configured to acquire the operation parameters of the air conditioning system in the operation mode;
the control unit is further configured to control the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operation parameters of the air conditioning system in the operation mode so as to realize cooling control on the frequency conversion module;
the operation mode is a heating mode; the operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator (8) in the air-conditioning system; the temperature of the frequency conversion module is recorded as the temperature of the frequency conversion module; the temperature of a flash evaporator (8) in the air-conditioning system is recorded as the temperature of the flash evaporator; the control unit, in the heating mode, according to an operation parameter of the air conditioning system in the operation mode, controls an opening degree of at least one of the first cooling and throttling module and the second cooling and throttling module to realize cooling control over the inverter module, including: if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be reduced, continuously collecting the temperature of the frequency conversion module, and stopping regulating the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature; and if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and is less than a set temperature.
2. The cooling control device of the frequency conversion module in the air conditioning system according to claim 1, wherein the first cooling throttle module and the second cooling throttle module are electronic expansion valves.
3. The cooling control device of the variable frequency module in the air conditioning system according to claim 1 or 2, wherein the operation mode is a cooling mode;
the operating parameters in the cooling mode include: the temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system; and recording the temperature of the frequency conversion module as the temperature of the frequency conversion module.
4. The cooling control device of an inverter module in an air conditioning system according to claim 3, wherein the control unit controls an opening degree of at least one of the first cooling throttle module and the second cooling throttle module according to an operation parameter of the air conditioning system in the operation mode in the cooling mode to realize cooling control of the inverter module, and comprises:
if the temperature of the frequency conversion module is lower than the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be decreased, controlling the opening degree of the second cooling throttling module to be increased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the environment dew point temperature and lower than a set temperature;
and if the temperature of the frequency conversion module is greater than or equal to the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module until the temperature of the frequency conversion module is greater than the environment dew point temperature and less than a set temperature, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module.
5. An air conditioning system, comprising: the cooling control apparatus of an inverter module in an air conditioning system according to any one of claims 1 to 4.
6. A cooling control method of an inverter module in an air conditioning system is characterized in that the inverter module in the air conditioning system is provided with a heat dissipation plate (11); part of pipelines in the refrigerant pipeline of the air conditioning system can exchange heat with the heat dissipation plate (11) to realize heat dissipation of the frequency conversion module; the cooling module of the frequency conversion module is formed by the heat dissipation plate (11) and a part of pipelines capable of exchanging heat with the heat dissipation plate (11) in the refrigerant pipeline; in the air conditioning system, a throttling unit is also arranged; the throttling unit includes: a first cooling throttle module and a second cooling throttle module; the first cooling throttling module is arranged in the first refrigerant pipeline; the second cooling throttling module is arranged in a second refrigerant pipeline; the first refrigerant pipeline is connected in series with the refrigerant pipeline where the cooling module is located; the second refrigerant pipeline is connected in parallel with the refrigerant pipeline where the first cooling throttling module and the cooling module are jointly located; the outdoor unit of the air conditioning system includes: the system comprises a compressor (1), a four-way valve (3), an outdoor heat exchanger (4), an indoor heat exchanger, a flash evaporator (8) and a filter (14); an exhaust port of the compressor (1) is communicated with a first end of the outdoor heat exchanger (4) and a first end of the indoor heat exchanger respectively after passing through the four-way valve (3); the second end of the outdoor heat exchanger (4) is communicated to the first end of the flash evaporator (8); the second end of the flash evaporator (8) is communicated to an air supplementing port of the compressor (1); the third end of the flash evaporator (8) is divided into two paths, one path of the flash evaporator passes through the cooling module and the first cooling throttling module and then is communicated to the first end of the filter (14), and the other path of the flash evaporator passes through the second cooling throttling module and then is communicated to the first end of the filter (14); a second end of the filter (14) being connected to a second end of the indoor heat exchanger;
the cooling control method of the frequency conversion module in the air conditioning system comprises the following steps:
determining an operation mode of the air conditioning system;
collecting operating parameters of the air conditioning system in the operating mode;
controlling the opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to the operation parameters of the air conditioning system in the operation mode so as to realize the cooling control of the frequency conversion module;
the operation mode is a heating mode; in the heating mode, according to an operation parameter of the air conditioning system in the operation mode, controlling an opening degree of at least one of the first cooling throttling module and the second cooling throttling module to realize cooling control over the frequency conversion module, including: if the temperature of the frequency conversion module is lower than the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be reduced, controlling the opening degree of the second cooling throttling module to be reduced, continuously collecting the temperature of the frequency conversion module, and stopping regulating the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the temperature of the flash evaporator and lower than a set temperature; and if the temperature of the frequency conversion module is greater than or equal to the temperature of the flash evaporator, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is greater than the temperature of the flash evaporator and is less than a set temperature.
7. The cooling control method of a frequency conversion module in an air conditioning system according to claim 6, wherein the operation mode is a cooling mode;
the operating parameters in the heating mode include: the temperature of the frequency conversion module and the temperature of a flash evaporator (8) in the air-conditioning system; the temperature of the frequency conversion module is recorded as the temperature of the frequency conversion module; the temperature of a flash evaporator (8) in the air-conditioning system is recorded as the temperature of the flash evaporator;
the operating parameters in the cooling mode include: the temperature of the frequency conversion module and the ambient dew point temperature of the air conditioning system; and recording the temperature of the frequency conversion module as the temperature of the frequency conversion module.
8. The method for controlling cooling of a frequency conversion module in an air conditioning system according to claim 7, wherein in the cooling mode, controlling an opening degree of at least one of the first cooling throttling module and the second cooling throttling module according to an operation parameter of the air conditioning system in the operation mode to realize cooling control of the frequency conversion module comprises:
if the temperature of the frequency conversion module is lower than the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be decreased, controlling the opening degree of the second cooling throttling module to be increased, continuously collecting the temperature of the frequency conversion module, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module until the temperature of the frequency conversion module is higher than the environment dew point temperature and lower than a set temperature;
and if the temperature of the frequency conversion module is greater than or equal to the environment dew point temperature, controlling the opening degree of the first cooling throttling module to be increased, controlling the opening degree of the second cooling throttling module to be decreased, continuously collecting the temperature of the frequency conversion module until the temperature of the frequency conversion module is greater than the environment dew point temperature and less than a set temperature, and stopping adjusting the opening degrees of the first cooling throttling module and the second cooling throttling module.
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