CN112460774B - Frequency converter thermal management system of air conditioner and air conditioner - Google Patents
Frequency converter thermal management system of air conditioner and air conditioner Download PDFInfo
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- CN112460774B CN112460774B CN201910841949.7A CN201910841949A CN112460774B CN 112460774 B CN112460774 B CN 112460774B CN 201910841949 A CN201910841949 A CN 201910841949A CN 112460774 B CN112460774 B CN 112460774B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a frequency converter heat management system of an air conditioner, which comprises a frequency converter cooling unit, wherein the frequency converter cooling unit comprises a cooling loop for cooling a frequency converter power module, the cooling loop comprises a plurality of cooling branches which are connected in parallel, a cooler and a first switch module are arranged in each cooling branch, and each first switch module is positioned on the cooling branch corresponding to the outlet end of the cooler. The invention also discloses an air conditioner, which comprises a refrigeration system and a frequency converter, wherein the refrigeration system comprises a compressor, a condenser, a main evaporator and a throttling element, the inlet end of the compressor is connected with the main evaporator, the outlet end of the compressor is connected with the condenser, the throttling element is positioned between the condenser and the main evaporator, the frequency converter is provided with the frequency converter thermal management system of the air conditioner, and two ends of a frequency converter cooling unit in the frequency converter thermal management system are respectively connected with the condenser and the main evaporator. The heat management system has the advantages of simple structure, condensation prevention, accurate control and the like.
Description
Technical Field
The invention mainly relates to the technical field of power electronic heat management, in particular to a frequency converter heat management system of an air conditioner and the air conditioner.
Background
The frequency conversion of the refrigeration and heat pump unit has stronger working condition adjusting capability, and is an effective measure for improving the unit energy adjustment. The frequency conversion of the central air conditioner has become an industry trend. The frequency converter of the unit is cooled by adopting a refrigerant, and has the advantages of high efficiency, simplicity, cleanness, strong economy, convenience in maintenance and the like. However, thermal management of the frequency converter is also more complex, and a better performance thermal management system is needed.
The heat management load in the frequency converter of the refrigeration and heat pump unit is generally divided into two parts, one part is the heat of the power device, and the other part is the heat of other parts. The specific gravity of the heat of the power device is large, the heat is usually directly transferred to a refrigerant through a cold plate and taken away, other parts are taken away by air, and the air can be taken away by an air-cooled evaporator (an air-cooled module). The cold plate is usually controlled by an expansion valve with stepless regulation capacity, and the air-cooled evaporator is usually controlled by an electromagnetic valve with discontinuous regulation capacity. In actual operation, the temperature of the refrigerant cooling in the inverter may be below the ambient temperature, and compared with the conventional water cooling and air cooling system, the new problem of condensation may occur. In addition, for the multi-power module frequency converter, the cooling branches of each power module need to be designed in parallel, and when the difference of each cooling branch is large, each cooling branch cannot be accurately controlled.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the frequency converter heat management system of the air conditioner and the air conditioner, which have the advantages of simple structure, condensation prevention and accurate control.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a converter thermal management system of air conditioner, includes that both ends link to each other with condenser and main evaporimeter in the air conditioner refrigerating system respectively the converter cooling unit, converter cooling unit is including the cooling circuit who is used for cooling converter power module, cooling circuit includes a plurality of cooling branch circuits that connect in parallel each other, all is equipped with cooler and first switch module in each cooling branch circuit, each first switch module is located and corresponds the cooling branch circuit of cooler exit end.
As a further improvement of the technical scheme:
and a second switch module is arranged on the cooling branch at the inlet end of each cooler.
The first switch module is connected with a manual switch in parallel.
The manual switch is a manual ball valve.
The first switch module and the second switch module are solenoid valves, electronic expansion valves, thermal expansion valves, capillary tubes or orifice plates.
The frequency converter cooling unit further comprises an air-cooled evaporation loop for cooling air in the frequency converter, and the air-cooled evaporation loop is connected with each cooling branch in parallel.
The air-cooled evaporation loop comprises an air-cooled evaporator, and a switch element is arranged at the inlet end of the air-cooled evaporator.
The temperature detection piece is arranged at the air-cooled evaporator and used for detecting the temperature of the air inside the frequency converter; the switching element is connected with the temperature detection piece and is used for carrying out switching action or/and opening degree adjustment according to the temperature value detected by the temperature detection piece so as to maintain the temperature of the air in the frequency converter within a constant range.
The switching element is a solenoid valve.
The invention also discloses an air conditioner, which comprises a refrigeration system and a frequency converter, wherein the refrigeration system comprises a compressor, a condenser, a main evaporator and a first throttling element, the inlet end of the compressor is connected with the main evaporator, the outlet end of the compressor is connected with the condenser, the first throttling element is positioned between the condenser and the main evaporator, the frequency converter is provided with the frequency converter heat management system of the air conditioner, and two ends of a frequency converter cooling unit in the frequency converter heat management system are respectively connected with the condenser and the main evaporator.
Compared with the prior art, the invention has the advantages that:
according to the frequency converter thermal management system of the air conditioner and the air conditioner, the refrigerant flow of the corresponding cooling branch is controlled through the first switch module, so that each power module of the frequency converter operates within a reasonable temperature range; the first switch module is arranged on each cooling branch, so that each cooling branch can be independently adjusted, the temperature uniformity of the cooler is improved, difference adjustment is realized, and the cooling branch heat dissipation device is suitable for the condition that the loss of each cooling branch has certain difference (such as different heat dissipation capacity of a power device); on the basis, the first switch module is positioned at the downstream of the cooler, and compared with the mode of being arranged at the upstream of the cooler, the temperature of the cooler in the cooling branch is in a higher range, so that the possibility of condensation inside the frequency converter is greatly reduced, even completely eliminated.
According to the frequency converter heat management system of the air conditioner and the air conditioner, the second switch module and the first switch module are mutually matched for control, so that any temperature control under the full temperature region of the air conditioner can be realized, the frequency converter is not over-temperature or condensed under special units and working conditions, the reliability and working condition applicability are improved, and the frequency converter heat management system is particularly suitable for units with high power grade and high condenser temperature.
Drawings
Fig. 1 is one of block configuration diagrams in an embodiment of the present invention.
Fig. 2 is a second block diagram of the present invention in an embodiment.
The reference numbers in the figures denote: 1. a compressor; 2. a condenser; 3. a primary evaporator; 4. a frequency converter cooling unit; 41. a cooling circuit; 411. a cooling branch; 412. a cooler; 413. a first switch module; 414. a second switch module; 42. an air-cooled evaporation loop; 421. a switching element; 422. a capillary tube; 423. an air-cooled evaporator; 424. a fan; 43. a manual switch; 5. A first throttling element.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1, the inverter thermal management system of the air conditioner of this embodiment includes an inverter cooling unit 4 whose two ends are respectively connected to a condenser 2 and a main evaporator 3 in a refrigeration system of the air conditioner, where the inverter cooling unit 4 includes a cooling circuit 41 for cooling an inverter power module, the cooling circuit 41 includes a plurality of cooling branches 411 connected in parallel, each cooling branch 411 is provided with a cooler 412 and a first switch module 413, and each first switch module 413 is located on the cooling branch 411 corresponding to an outlet end of the cooler 412. Each power module in the frequency converter is installed on the cooler 412 to form heat transfer, and the heat generated when each power module works is taken away through the low-temperature refrigerant flowing through the cooler 412, so that the purpose of cooling is achieved.
According to the frequency converter thermal management system of the air conditioner, the refrigerant flow of the corresponding cooling branch 411 is controlled through the first switch module 413, so that each power module of the frequency converter operates within a reasonable temperature range; each cooling branch 411 is provided with a first switch module 413, so that each cooling branch 411 can be independently adjusted, the temperature uniformity of the cooler 412 is improved, and differential adjustment is realized, and the method is suitable for the condition that the loss of each cooling branch 411 has certain difference (for example, the heat dissipation capacity of a power device is different); on the basis that the first switching module 413 is located downstream of the cooler 412, the temperature of the cooler 412 in the cooling branch 411 is in a higher range than in the previous arrangement upstream of the cooler 412, and the possibility of internal condensation of the frequency converter is greatly reduced or even completely eliminated.
In this embodiment, the first switch module 413 is one or a combination of a solenoid valve, an electronic expansion valve, a thermal expansion valve, a capillary tube, or a throttle orifice; in addition, the first switch module 413 is connected in parallel with a manual switch 43 (such as a manual ball valve), when the first switch module 413 breaks down, the manual ball valve can be opened manually to ensure that the system can continue to work, the reliability of the system is ensured, and meanwhile, the maintenance of the broken switch module is facilitated.
As shown in fig. 2, in the present embodiment, a second switch module 414 is disposed on the cooling branch 411 at the inlet end of each cooler 412; the second switch module 414 is one or a combination of a solenoid valve, an electronic expansion valve, a thermostatic expansion valve, a capillary tube or a throttle orifice plate; through the mutual cooperation control between the first switch module 413 and the second switch module 414, the arbitrary temperature control under the full-temperature-zone of the air conditioner can be realized, so that the frequency converter is not over-temperature or condensation under special units and working conditions, the reliability and the working condition applicability are improved, and the frequency converter is particularly suitable for units with high power grade and higher temperature of the condenser 2.
In this embodiment, the frequency converter cooling unit 4 further includes an air-cooled evaporation circuit 42 for cooling air inside the frequency converter, and the air-cooled evaporation circuit 42 is connected in parallel with each cooling branch 411. Specifically, the air-cooled evaporation circuit 42 includes a switch element 421 (such as an electromagnetic valve), a capillary tube 422 and an air-cooled evaporator 423 that are sequentially arranged along a refrigerant conveying direction, one side of the air-cooled evaporator 423 is provided with a fan 424, the fan 424 blows air into the air-cooled evaporator 423 to exchange heat with a low-temperature refrigerant, so that low-temperature air is formed to cool each component in the frequency converter. In addition, a temperature detector (e.g., a temperature sensor, not shown) is disposed near the air-cooled evaporator 423 for detecting the temperature of the air inside the inverter and further adjusting the temperature inside the inverter: one is that the fan 424 can start and stop and variable speed regulation according to the temperature value that detects, and the other is that the solenoid valve can switch and the aperture is adjusted according to the temperature value that detects to maintain the air temperature in the converter in the constant range.
In this embodiment, the cooler 412 is a metal cold plate with a refrigerant medium channel therein, and each power module directly contacts with the cold plate, but the type of the cooler 412 may be selected according to the field situation. When the frequency converter is installed, an angle valve or an electromagnetic valve can be additionally arranged at the position of the frequency converter so as to facilitate pipeline connection; at the position of the frequency converter, a stop valve can be additionally arranged so as to facilitate pipeline connection.
The invention also discloses an air conditioner, which comprises a refrigeration system and a frequency converter, wherein the refrigeration system comprises a compressor 1, a condenser 2, a main evaporator 3 and a first throttling element 5, the inlet end of the compressor 1 is connected with the main evaporator 3, the outlet end of the compressor is connected with the condenser 2, the first throttling element 5 is positioned between the condenser 2 and the main evaporator 3, the frequency converter is provided with the frequency converter heat management system of the air conditioner, and two ends of a frequency converter cooling unit 4 in the frequency converter heat management system are respectively connected with the condenser 2 and the main evaporator 3. The air conditioner of the invention adopts a heat pump unit. The air conditioner of the present invention also has the advantages as described above for the thermal management system, since it includes the thermal management system as described above.
When the cooling system works, a compressor 1 compresses to obtain a high-pressure gas-phase refrigerant, the high-pressure gas-phase refrigerant is conveyed to a condenser 2 to be condensed to obtain a high-pressure liquid-phase refrigerant, and part of the high-pressure liquid-phase refrigerant enters a frequency converter cooling unit 4 to carry out heat exchange to cool a frequency converter; the refrigerant which completes heat exchange with the frequency converter enters the main evaporator 3, further performs heat exchange with the external environment in the main evaporator 3 to complete the refrigeration function to the outside, so as to obtain low-pressure gas-phase refrigerant, and then enters the compressor 1 to be compressed so as to obtain high-pressure gas-phase refrigerant, so as to complete one-time circulation. On the premise that an air conditioner refrigerating system exists, the frequency converter is communicated with the refrigerating system of the air conditioning unit, so that the structure is simple, and the influence on the whole structure of the unit is small; the refrigerant can not generate scaling and corrosion phenomena in the pipeline of the cooling unit 4 of the frequency converter; because the cooling method adopts the refrigerant in the condenser 2 to cool the frequency converter, the temperature of the refrigerant is controllable, the influence of the external environment is small, and the cooling effect is stable and reliable; the cooling function of the frequency converter and the cooling function of the air conditioner are simultaneously completed in one refrigerating system, and the normal operation of the air conditioning unit is effectively ensured on the premise of normal and stable operation of the frequency converter. In addition, the air conditioning unit comprises the frequency converter thermal management system of the air conditioning unit, and the air conditioning unit also has the advantages of the frequency converter thermal management system of the air conditioning unit.
In the embodiment, the refrigeration system further comprises a flash evaporator, a first change-over switch, a second throttling element and a third throttling element, the condenser 2 is connected with the main evaporator 3 through the flash evaporator, the first throttling element 5 is positioned between the condenser 2 and the flash evaporator, the second throttling element is positioned between the compressor 1 and the flash evaporator, the third throttling element is positioned between the flash evaporator and the main evaporator 3, and the outlet end of the frequency converter cooling unit 4 is connected with the flash evaporator through the first change-over switch and is connected with the main evaporator 3 through the second change-over switch; the first change-over switch and the second change-over switch are interlocked, and only one change-over switch is switched on during work. The first change-over switch and the second change-over switch correspond to the following two working modes:
the first mode of operation: the second switch is turned on and the first switch is turned off; compressing in a compressor 1 to obtain a high-pressure gas-phase refrigerant, conveying the high-pressure gas-phase refrigerant into a condenser 2 for condensation to obtain a high-pressure liquid-phase refrigerant, and partially entering a frequency converter cooling unit 4 for heat exchange to cool the frequency converter; the refrigerant which completes heat exchange with the frequency converter enters the main evaporator 3, further performs heat exchange with the external environment in the main evaporator 3 to complete the refrigeration function to the outside, so as to obtain low-pressure gas-phase refrigerant, and then enters the compressor 1 to be compressed so as to obtain high-pressure gas-phase refrigerant, so as to complete one-time circulation.
The second working mode is as follows: the first change-over switch is turned on and the second change-over switch is turned off; compressing in a compressor 1 to obtain a high-pressure gas-phase refrigerant, conveying the high-pressure gas-phase refrigerant into a condenser 2 for condensation to obtain a high-pressure liquid-phase refrigerant, and partially entering a frequency converter cooling unit 4 for heat exchange to cool the frequency converter; the refrigerant which completes heat exchange in the frequency converter and the refrigerant which directly flows out of the condenser 2 through the first throttling element 5 are mixed to form a gas-liquid two-phase refrigerant, the low-pressure gas-phase refrigerant obtained after flash vaporization enters the compressor 1, air is supplied to an impeller of the compressor 1, the low-pressure liquid-phase refrigerant obtained after flash vaporization enters the main evaporator 3 to complete the cooling function of the original refrigeration system, the original refrigeration system of the air conditioner is not influenced, in addition, the cooling effect of cooling the frequency converter by using the refrigerant is stable, the normal operation of the cooling system and the air conditioner is ensured, and the effect of simultaneously cooling the internal structure of the frequency converter and the external environment is realized.
For the switching control of the first switch and the second switch, the following control strategies are adopted: when the working pressure difference is enough (for example, a certain preset value is reached), the first change-over switch is closed, and the second change-over switch is opened (a first working mode); when the working pressure difference is not enough (for example, lower than the preset value), the second change-over switch is closed, and the first change-over switch is opened (second working mode). During specific application, in the starting process of the frequency converter, because the power demand is large, the corresponding heat dissipation capacity is also large, so that a first working mode can be adopted, the cooling effect of the internal structure of the frequency converter in the starting process is guaranteed, the working temperature area of the frequency converter is expanded, and the adaptability to the limit working condition is stronger.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (6)
1. An air conditioner comprises a refrigeration system and a frequency converter, wherein the refrigeration system comprises a compressor (1), a condenser (2), a main evaporator (3) and a first throttling element (5), the inlet end of the compressor (1) is connected with the main evaporator (3), the outlet end of the compressor is connected with the condenser (2), the first throttling element (5) is positioned between the condenser (2) and the main evaporator (3), the frequency converter is provided with a frequency converter heat management system of the air conditioner, the frequency converter heat management system of the air conditioner comprises a frequency converter cooling unit (4) of which two ends are respectively connected with the condenser (2) and the main evaporator (3) in the refrigeration system of the air conditioner, the frequency converter cooling unit (4) comprises a cooling loop (41) for cooling a frequency converter power module, the cooling loop (41) comprises a plurality of cooling branches (411) which are connected in parallel with each other, each cooling branch (411) is internally provided with a cooler (412) and a first switch module (413), and each first switch module (413) is positioned on the cooling branch (411) corresponding to the outlet end of the cooler (412);
the frequency converter cooling unit (4) further comprises an air-cooled evaporation loop (42) for cooling air inside the frequency converter, and the air-cooled evaporation loop (42) is connected with each cooling branch (411) in parallel;
the air-cooled evaporation loop (42) comprises an air-cooled evaporator (423), and the inlet end of the air-cooled evaporator (423) is provided with a switch element (421);
the temperature detection piece is arranged at the air-cooled evaporator (423) and is used for detecting the temperature of the air inside the frequency converter; the switch element (421) is connected with the temperature detection part and is used for performing switching action or/and opening degree adjustment according to the temperature value detected by the temperature detection part so as to maintain the temperature of the air in the frequency converter within a constant range;
the system is characterized in that two ends of a frequency converter cooling unit (4) in the frequency converter thermal management system are respectively connected with the condenser (2) and the main evaporator (3);
the refrigeration system also comprises a flash evaporator, a first change-over switch, a second throttling element and a third throttling element, wherein the condenser (2) is connected with the main evaporator (3) through the flash evaporator, the first throttling element (5) is positioned between the condenser (2) and the flash evaporator, the second throttling element is positioned between the compressor (1) and the flash evaporator, the third throttling element is positioned between the flash evaporator and the main evaporator (3), and the outlet end of the frequency converter cooling unit (4) is connected with the flash evaporator through the first change-over switch and is connected with the main evaporator (3) through the second change-over switch; the first change-over switch and the second change-over switch are interlocked, so that only one change-over switch is switched on during working; the first change-over switch and the second change-over switch correspond to the following two working modes:
the first mode of operation: the second switch is turned on and the first switch is turned off; compressing in a compressor (1) to obtain a high-pressure gas-phase refrigerant, conveying the high-pressure gas-phase refrigerant into a condenser (2) for condensation to obtain a high-pressure liquid-phase refrigerant, and partially entering a frequency converter cooling unit (4) for heat exchange to cool the frequency converter; the refrigerant which completes heat exchange with the frequency converter enters a main evaporator (3), further performs heat exchange with the external environment in the main evaporator (3) to complete the refrigeration function to the outside, so as to obtain a low-pressure gas-phase refrigerant, and then enters a compressor (1) to be compressed so as to obtain a high-pressure gas-phase refrigerant, so as to complete primary circulation;
the second working mode is as follows: the first change-over switch is turned on and the second change-over switch is turned off; compressing in a compressor (1) to obtain a high-pressure gas-phase refrigerant, conveying the high-pressure gas-phase refrigerant into a condenser (2) for condensation to obtain a high-pressure liquid-phase refrigerant, and partially entering a frequency converter cooling unit (4) for heat exchange to cool the frequency converter; the refrigerant which completes heat exchange in the frequency converter and the refrigerant which directly flows out of the condenser (2) through the first throttling element (5) are mixed to form a gas-liquid two-phase refrigerant, a low-pressure gas-phase refrigerant obtained after flash vaporization enters the compressor (1), air is supplied to an impeller of the compressor (1), and a low-pressure liquid-phase refrigerant obtained after flash vaporization enters the main evaporator (3) to complete the cooling function of the original refrigeration system;
for the switching control of the first switch and the second switch, the following control strategies are adopted: when the working pressure difference reaches a certain preset value, the first change-over switch is closed, the second change-over switch is opened, and the first working mode is switched; and when the working pressure difference is lower than the preset value, the second change-over switch is closed, the first change-over switch is opened, and the second working mode is switched.
2. The air conditioner according to claim 1, wherein a second switch module (414) is disposed on the cooling branch (411) at the inlet end of each cooler (412).
3. The air conditioner according to claim 1, wherein the first switch module (413) is connected in parallel with a manual switch (43).
4. The air conditioner according to claim 3, wherein the manual switch (43) is a manual ball valve.
5. The air conditioner according to claim 2, 3 or 4, wherein the first switch module (413) and the second switch module (414) are solenoid valves, electronic expansion valves, thermostatic expansion valves, capillary tubes or orifice plates.
6. The air conditioner according to claim 1, wherein the switching element (421) is a solenoid valve.
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| CN201910841949.7A CN112460774B (en) | 2019-09-06 | 2019-09-06 | Frequency converter thermal management system of air conditioner and air conditioner |
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| CN201910841949.7A CN112460774B (en) | 2019-09-06 | 2019-09-06 | Frequency converter thermal management system of air conditioner and air conditioner |
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| CN112460774B true CN112460774B (en) | 2022-08-02 |
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| CN114144030B (en) * | 2021-11-19 | 2023-03-28 | 珠海格力电器股份有限公司 | Heat dissipation device of frequency converter, control method and control device of heat dissipation device and electric appliance |
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| CN104638879A (en) * | 2013-11-08 | 2015-05-20 | 珠海格力电器股份有限公司 | Frequency converter and air conditioner |
| JP5626439B2 (en) * | 2013-12-04 | 2014-11-19 | ダイキン工業株式会社 | Refrigeration equipment |
| CN105299939A (en) * | 2015-11-30 | 2016-02-03 | 珠海格力电器股份有限公司 | Frequency changer cooling and dehumidification system, frequency conversion type compressor unit and refrigeration plant |
| CN106352615A (en) * | 2016-11-03 | 2017-01-25 | 广东美的暖通设备有限公司 | Air conditioner and refrigerant cooling control method for same |
| CN109842271A (en) * | 2017-11-27 | 2019-06-04 | 中车株洲电力机车研究所有限公司 | A kind of frequency converter that integrated air-conditioning is cooling |
| CN108775721A (en) * | 2018-07-27 | 2018-11-09 | 珠海格力电器股份有限公司 | Cooling system and its control method |
| CN110160279A (en) * | 2019-05-24 | 2019-08-23 | 广东美的暖通设备有限公司 | Frequency changing refrigeration system and water cooler with it |
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