CN106546045A - Frequency converter cooling device, air conditioning unit and control method - Google Patents
Frequency converter cooling device, air conditioning unit and control method Download PDFInfo
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- CN106546045A CN106546045A CN201611042631.5A CN201611042631A CN106546045A CN 106546045 A CN106546045 A CN 106546045A CN 201611042631 A CN201611042631 A CN 201611042631A CN 106546045 A CN106546045 A CN 106546045A
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- chilled water
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- frequency converter
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- 238000001816 cooling Methods 0.000 title claims abstract description 301
- 238000004378 air conditioning Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 253
- 239000003507 refrigerant Substances 0.000 claims abstract description 63
- 238000007791 dehumidification Methods 0.000 claims description 39
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 17
- 238000005057 refrigeration Methods 0.000 description 9
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 241000221535 Pucciniales Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a frequency converter cooling device, wherein the frequency converter cooling device comprises a refrigerant cooling system and a chilled water cooling system; the compressor, the cooling assembly and the heat exchanger assembly of the refrigerant cooling system are sequentially connected through pipelines to form a refrigerant loop; the chilled water inlet pipe, the frequency converter cooling module, the chilled water outlet pipe and the heat exchanger assembly of the chilled water cooling system are sequentially connected to form a chilled water loop. According to the frequency converter cooling device, water in the chilled water cooling system exchanges heat with the refrigerant in the refrigerant cooling system in the heat exchanger assembly for cooling, and the frequency converter is further cooled by the water in the chilled water cooling system, so that the frequency converter can be cooled in real time even if the circulating cooling system of the air conditioning unit where the frequency converter is located does not operate, and the operation safety of the frequency converter is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a frequency converter cooling device, an air conditioning unit and a control method.
Background
In the traditional technology, a cooling mode for a frequency converter in an air conditioning unit is to obtain a cold source from other independent air conditioning systems, and the cooling mode usually needs to construct a pipeline connected with the other independent air conditioning systems, so that the engineering installation is unchanged, and the occupied space is large. Another cooling method for the frequency converter in the air conditioning unit is to obtain a cold source from a refrigeration cycle system of the unit, and this cooling method must be implemented when the refrigeration cycle system of the unit is working, but in some special cases, such as a photovoltaic air conditioning unit, when the air conditioning unit is only operating in a photovoltaic power generation mode, the refrigeration cycle system of the air conditioning unit does not work, so that the frequency converter which needs to work cannot be cooled.
Disclosure of Invention
Therefore, it is necessary to provide an inverter cooling device, an air conditioning unit and a control method for solving the problem that the air conditioning unit cannot cool the inverter in real time in the conventional technology.
The invention provides a frequency converter cooling device, wherein the frequency converter cooling device comprises a refrigerant cooling system and a chilled water cooling system;
the refrigerant cooling system comprises a compressor, a cooling assembly and a heat exchanger assembly, wherein an exhaust port of the compressor, the cooling assembly, the heat exchanger assembly and a suction port of the compressor are sequentially connected through pipelines to form a refrigerant loop;
the chilled water cooling system comprises a chilled water inlet pipe, a chilled water outlet pipe and a frequency converter cooling module, wherein the chilled water inlet pipe, the frequency converter cooling module, the chilled water outlet pipe and the heat exchanger assembly are sequentially connected to form a chilled water loop, and the frequency converter cooling module is used for cooling the frequency converter;
the chilled water in the chilled water circuit exchanges heat with the refrigerant in the refrigerant circuit in the heat exchanger assembly.
In one embodiment, the chilled water cooling system includes a dehumidification evaporator assembly disposed on the chilled water inlet pipe.
In one embodiment, the dehumidification evaporator assembly comprises a shell, a first fan and a first heat exchanger, wherein an air return opening and an air outlet are formed in the shell, the first fan and the first heat exchanger are arranged in the shell, and the first fan is used for enabling air to flow through the first heat exchanger after entering the shell from the air return opening and then to flow out of the shell from the air outlet.
In one embodiment, the dehumidification evaporator further comprises a first temperature sensor disposed at the return air inlet.
In one embodiment, the bottom of the shell is provided with a water receiving tray.
In one embodiment, a bent water storage elbow is arranged at the bottom of the water pan, and the water pan is communicated with the outside of the frequency conversion cabinet through the water storage pipe.
In one embodiment, the chilled water cooling system comprises a chilled water inlet pipe of the air conditioner main unit and a chilled water outlet pipe of the air conditioner main unit;
the first end of the chilled water inlet pipe of the air-conditioning main unit is connected to the chilled water inlet pipe, and the chilled water inlet pipe of the air-conditioning main unit is used for introducing chilled water of a circulating cooling system of an air-conditioning unit into the chilled water cooling system;
the first end of the air conditioner main machine chilled water outlet pipe is connected to the chilled water outlet pipe, and the air conditioner main machine chilled water outlet pipe is used for conveying chilled water after the heat exchange of the chilled water cooling system back to the air conditioning unit circulating cooling system.
In one embodiment, the connection point of the chilled water inlet pipe of the main air conditioner and the chilled water inlet pipe is positioned between the dehumidification evaporator assembly and the heat exchanger assembly.
In one embodiment, a first switch assembly is arranged on the chilled water outlet pipe; the first end of the air conditioner host machine chilled water outlet pipe and the connection point of the chilled water outlet pipe are located between the first switch assembly and the frequency converter cooling module.
In one embodiment, a second temperature sensor is arranged at the joint of the chilled water outlet pipe and the frequency converter cooling module.
The invention also provides an air conditioning unit, wherein the air conditioning unit comprises a frequency converter and the frequency converter cooling device, and the frequency converter cooling module is used for cooling the frequency converter.
The invention also provides a control method of the frequency converter cooling device, wherein the control method comprises the following steps:
and when the circulating cooling system of the air conditioner unit is not operated, controlling the refrigerant cooling system and the chilled water cooling system to work.
In one embodiment, the controlling the operation of the refrigerant cooling system and the chilled water cooling system comprises the following steps:
controlling the work of a compressor in the refrigerant cooling system;
controlling a second fan of a cooling assembly in the refrigerant cooling system to work;
controlling a throttling device arranged on a pipeline between a cooling assembly and a heat exchanger assembly in the refrigerant cooling system to be opened;
controlling a water pump in the freezing water cooling system to work;
controlling a first fan of a dehumidification evaporator assembly in a chilled water cooling system to work;
and controlling a first switch assembly arranged on a chilled water outlet pipe in the chilled water cooling system to be opened.
In one embodiment, the control method comprises the following steps:
and when the circulating cooling system of the air conditioning unit operates, controlling the cooling water cooling system to work.
In one embodiment, the controlling the operation of the cooling water cooling system includes the following steps:
controlling a second switch component arranged on a chilled water inlet pipe of an air conditioner main unit in the chilled water cooling system to be turned on;
controlling a water pump in the freezing water cooling system to work;
controlling a first fan of a dehumidification evaporator assembly in a chilled water cooling system to work;
and controlling a third switch component arranged on a chilled water outlet pipe of the air conditioner main unit in the chilled water cooling system to be opened.
In one embodiment, the control method further comprises the steps of:
obtaining the frequency converter cooling temperature measured by a second temperature sensor arranged at the joint of the chilled water outlet pipe and the frequency converter cooling module, and comparing the frequency converter cooling temperature with a first preset temperature and a second preset temperature, wherein the first preset temperature is higher than the second preset temperature;
when the temperature of the variable-frequency cooler is higher than the first preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be increased;
and when the cooling temperature of the variable-frequency cooler is lower than the second preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be reduced.
The frequency converter cooling device comprises a refrigerant cooling system and a chilled water cooling system; the water in the chilled water cooling system exchanges heat with the refrigerant in the refrigerant cooling system in the heat exchanger assembly for cooling, the frequency converter is further cooled by the water in the chilled water cooling system, a cooling circulation system of other air conditioning units is not required to be connected, the problems of complex engineering installation and land occupation are solved, in addition, even if the circulating cooling system of the air conditioning unit where the frequency converter is located does not operate, the frequency converter can be cooled in real time, and the operation safety of the frequency converter is improved.
Above-mentioned converter cooling device still is provided with the dehumidification evaporator assembly in the refrigerated water cooling system, and this dehumidification evaporator assembly utilizes the refrigerated water cooling at first, consequently the temperature of dehumidification evaporator assembly is less than the temperature of converter cooling module and converter, so that the moisture in the air condenses the discharge converter in the dehumidification evaporator assembly in advance, avoid producing the condensation and cause the potential safety hazard on devices such as converter, in addition, the loss problems such as the device rusts such as converter have also been avoided.
Above-mentioned converter cooling device can also introduce the refrigerated water among the circulative cooling system of air conditioning unit the refrigerated water cooling system improves refrigerated efficiency.
The air conditioning unit is provided with the variable-frequency cooling device, and the variable-frequency cooling device can be used for cooling the frequency converter in real time when the circulating cooling system of the air conditioning unit does not operate, so that the operation safety of the frequency converter is improved.
According to the control method of the frequency converter cooling device, the working mode of the frequency converter cooling device is adjusted according to whether the circulating cooling system of the air conditioning unit is in the running state, so that the cooling efficiency and the safety performance of the frequency converter can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural diagram of a cooling apparatus for inverter according to a preferred embodiment of the present invention;
FIG. 2 is a schematic fluid flow diagram of a preferred embodiment of the cooling apparatus for frequency converter of the present invention;
FIG. 3 is a block flow diagram of a control method for a cooling device of an inverter according to a preferred embodiment of the present invention;
wherein,
110-a compressor; 120-a cooling assembly; 121-a first heat exchanger; 122-a second fan; 130-a heat exchanger assembly; 140-a throttling device; 150-an air-inlet grille; 160-an air outlet grid;
210-frequency converter cooling module; 211-a second temperature sensor; 220-a dehumidification evaporator assembly; 221-a housing; 222-air return; 223-a first temperature sensor; 224-air outlet; 225-a water-receiving tray; 226-trap; 227-a first fan; 228 — a first heat exchanger; 231-a water pump; 232-one-way valve; 233-a third temperature sensor; 241-a first switching component; 251-a second switching assembly; 252-a fourth temperature sensor; 261-a third switching component;
300-a frequency conversion cabinet;
400-control the mainboard.
Detailed Description
Referring to fig. 1 and 2, the inverter cooling device of the present invention includes a refrigerant cooling system, a chilled water cooling system, and a cooling cabinet.
The cold cabinet is attached to one side plate of the frequency conversion cabinet 300 and is hermetically connected with the frequency conversion cabinet, the refrigerant cooling system is arranged in the cold cabinet, the freezing water cooling system is arranged in the closed frequency conversion cabinet 300 where the frequency converter is located, and the refrigerant cooling system and the freezing water cooling system penetrate through the cold cabinet and are connected with the face, to which the frequency conversion cabinet is attached, of the cold cabinet.
The refrigerant cooling system includes a compressor 110, a cooling module 120, and a heat exchanger module 130, and an exhaust port of the compressor 110, the cooling module 120, the heat exchanger module 130, and a suction port of the compressor 110 are connected in sequence by pipes to form a refrigerant circuit. A throttle device 140 is provided in a pipe between the cooling unit 120 and the heat exchanger unit 130, and the cooling efficiency of the refrigerant cooling system can be controlled by controlling the throttle device 140.
The chilled water cooling system is provided with a chilled water inlet pipe, a chilled water outlet pipe and a frequency converter cooling module 210, wherein the chilled water inlet pipe, the frequency converter cooling module 210, the chilled water outlet pipe and the heat exchanger assembly 130 are sequentially connected to form a chilled water loop, and the frequency converter cooling module 210 is used for cooling the frequency converter.
A third temperature sensor 233 is arranged at the joint of the chilled water inlet pipe and the heat exchanger assembly 130, and the third temperature sensor 233 is used for measuring the temperature of the chilled water after heat exchange and temperature reduction with the heat exchanger. The chilled water inlet pipe is also provided with a water pump 231 and a one-way valve 232, the water pump 231 is used for providing circulating power of chilled water in the chilled water loop, and the one-way valve 232 is used for avoiding the backflow of the chilled water in the chilled water loop.
In other embodiments, the water pump 231 may be disposed at other positions of the chilled water circuit, for example, on the chilled water outlet pipe.
A first switch component 241 is disposed on the chilled water outlet pipe, and the first switch component 241 is preferably a solenoid valve. The inverter refrigerating apparatus can control whether the chilled water enters the heat exchanger assembly 130 to exchange heat with the refrigerant therein by controlling the opening and closing of the first switch assembly 241.
The junction of the chilled water outlet pipe and the frequency converter cooling module 210 is also provided with a second temperature sensor 211, the second temperature sensor 211 is used for measuring the cooling temperature of the frequency converter cooling module 210, and the cooling efficiency of the frequency converter cooling device can be judged through the temperature value measured by the second temperature sensor 211.
Chilled water in the chilled water loop exchanges heat with a refrigerant in the refrigerant loop in the heat exchanger assembly 130, the chilled water enters the frequency converter cooling module 210 through a chilled water inlet pipe after exchanging heat with the refrigerant and being cooled, the frequency converter is subjected to heat absorption and cooling in the frequency converter cooling module 210, and the chilled water after absorbing heat circularly enters the heat exchanger assembly 130 through a chilled water outlet pipe to exchange heat with the refrigerant.
The heat exchanger assembly 130 is a double-pipe heat exchanger, the chilled water in the chilled water loop and the refrigerant in the refrigerant loop respectively flow in a shell pass or a tube pass of the double-pipe heat exchanger in a reverse direction, and the refrigerant absorbs the heat of the chilled water, so that the temperature of the chilled water is reduced. In other embodiments, the heat exchanger assembly 130 may take other forms, such as a finned tube heat exchanger.
The cooling assembly 120 has a second fan 121 and a second heat exchanger 122, the refrigerant enters the second heat exchanger 122 from the exhaust port of the compressor 110, and releases heat and cools under the action of the second fan 121, and the generated low-temperature liquid refrigerant enters the heat exchanger assembly 130 to cool the water in the chilled water circuit.
An air inlet grille 150 and an air outlet grille 160 are arranged on any other side surface of the cooling cabinet, and under the action of the second fan 121, the cooling assembly 130 allows cold air outside the cooling cabinet to enter the cooling cabinet through the air inlet grille 150, flow through the second heat exchanger 122 to cool the second heat exchanger 122, and then be discharged out of the cooling cabinet through the air outlet grille 160.
The frequency converter cooling module 210 is a heat exchanger, such as a plate heat exchanger or a U-shaped tube plate heat exchanger, and the frequency converter cooling module can exchange heat with the frequency converter module to cool the frequency converter module and maintain a certain temperature.
Among this converter cooling device, refrigerant cooling system, refrigerated water cooling system set up in inverter cabinet 300 with the converter simultaneously, combine to be in the same place, have reduced the occupation of land and the installation of traditional cooling outer machine, simple structure, occupation space is little, need not even get the cooling circulation system of other air conditioning unit, has solved the problem that the engineering installation is complicated and occupation of land. In addition, when the circulating cooling system of the air conditioning unit where the frequency converter is located does not operate, the frequency converter can be cooled in real time through the refrigerant cooling system in the cold cabinet, and the operation safety of the frequency converter is improved.
As an alternative embodiment, a dehumidification evaporator assembly 220 is disposed on the chilled water inlet pipe, and the dehumidification evaporator assembly 220 includes a housing 221, a first fan 227, a first heat exchanger 228, a first temperature sensor 223, and a water pan 225. The shell 221 is provided with an air return opening 222 and an air outlet 224, the first fan 227 and the first heat exchanger 228 are disposed in the shell 221, and the first fan 227 enables air to enter the shell 221 from the air return opening 222 and flow through the first heat exchanger 228 and then flow out of the shell 221 from the air outlet 224. The air is cooled in the dehumidification evaporator assembly 220, and the water vapor carried by the air is condensed into water in the housing 221 and collected in the water pan 225.
As an alternative embodiment, the air return opening 222 is disposed at an upper portion of the housing 221, and the air outlet opening 224 is disposed at a lower portion of the housing 221.
In the converter operation process, especially in the great season of humidity, produce the condensation outside and inside the converter cabinet 300 of converter easily, and because the refrigerated water after cooling with heat exchanger subassembly 130 heat transfer in this embodiment at first gets into dehumidification evaporator assembly 220 and dehumidifies, then reentrant converter cooling module 210 cools down the converter, it is in minimum temperature point everywhere to have guaranteed dehumidification evaporator assembly 220, so that the vapor in the air condenses to water in dehumidification evaporator assembly 220, avoid supplying the temperature of frequency conversion cooling module low than initial evaporator assembly and produce the condensation on the converter module when dehumidification evaporator assembly 220 and converter cooling module 210 respectively, preferential dehumidification, reach and prevent that the condensation from appearing in the converter module, the potential safety hazard has been eliminated, avoided simultaneously because the vapor in the air makes the rust problem of components and parts.
Preferably, a bent water trap 226 is provided at the bottom of the water pan 225 of the dehumidifying evaporator assembly 220, and the water trap 226 passes through the inverter cabinet 300 to communicate with the outside. The crooked trap 226 on the one hand can draw the water in the water collector 225 out frequency conversion cabinet 300, and on the other hand because trap 226 has the flexion, has a certain amount of water at this flexion, and the effect of water seal can be realized to this hydroenergy of storing in the elbow, avoids in the outside humid air of frequency conversion cabinet 300 gets into frequency conversion cabinet 300.
As an alternative embodiment, a first temperature sensor 223 is disposed at the air return opening 222 of the dehumidification evaporator assembly 220, and the first temperature sensor 223 is used for measuring the air temperature at the air return opening 222, i.e. monitoring the temperature at the dehumidification evaporator assembly 220.
As an optional implementation mode, the chilled water cooling system is further provided with a chilled water inlet pipe of the air conditioner main unit and a chilled water outlet pipe of the air conditioner main unit. The first end of the chilled water inlet pipe of the air conditioner main unit is connected to the chilled water inlet pipe, and the other end of the chilled water inlet pipe of the air conditioner main unit is connected to a chilled water outlet pipeline in a circulating cooling system of an air conditioner unit where the frequency converter cooling device is located, and is used for introducing chilled water in the circulating cooling system of the air conditioner unit into the chilled water cooling system. The main machine chilled water inlet pipe of the air conditioner is provided with a second switch component 251 and a fourth temperature sensor 252, the second switch component 251 is preferably an electric valve, wherein the second switch component 251 is used for controlling the on-off and the flow rate of the main machine chilled water inlet pipe of the air conditioner, and the fourth temperature sensor 252 is used for measuring the temperature of chilled water flowing into the chilled water cooling system.
Preferably, the first end of the chilled water inlet pipe of the air conditioner main unit is connected to the chilled water inlet pipe between the heat exchanger assembly 130 and the dehumidification evaporator assembly 220, so that the chilled water introduced through the chilled water inlet pipe of the air conditioner main unit firstly exchanges heat and cools the dehumidification evaporator assembly 220.
The first end of the chilled water outlet pipe of the air-conditioning main unit is connected to the chilled water outlet pipe, and the other end of the chilled water outlet pipe of the air-conditioning main unit is connected to a main chilled water return pipe of a circulating cooling system of an air-conditioning unit where the frequency converter cooling device is located, and is used for conveying chilled water subjected to heat exchange in the chilled water cooling system back to the circulating cooling system of the air-conditioning unit. A third switch assembly 261 is arranged on the chilled water outlet pipe of the air conditioner main unit, and the third switch assembly 261 is preferably a solenoid valve.
Preferably, the first end of the chilled water outlet pipe of the air conditioner main unit is connected to the chilled water outlet pipe between the first switch component 241 and the frequency converter cooling module 210, and the chilled water in the chilled water system can be controlled to enter the heat exchanger component 130 for heat exchange and temperature reduction by controlling the opening and closing of the first switch component 241.
The refrigerated water source of the air conditioning unit is connected with the refrigerated water outlet pipe of the air conditioning main unit through the refrigerated water inlet pipe of the air conditioning main unit, and the refrigerated water source in the circulating cooling system of the air conditioning main unit is extracted for dehumidification and cooling according to the actual load running condition of the machine, for example, when the load of the machine is increased and the cooling capacity required by the frequency converter module is large, so that the cooling performance of the frequency conversion cooling device is improved.
As an alternative, when the chilled water source in the main air conditioner circulation cooling system is extracted for dehumidification and cooling, the refrigerant cooling system can be selected to be turned off because the main air conditioner circulation cooling system tends to have a larger cooling capacity.
As an alternative embodiment, the compressor 110 may be an inverter compressor 110, and the refrigeration efficiency of the refrigerant cooling system can be controlled by controlling the power of the inverter compressor 110.
As an optional implementation manner, the inverter cooling device is further provided with a control main board 400, the control main board 400 is in signal connection with the refrigerant cooling system and the chilled water cooling system, further, the control main board 400 is also in signal connection with the air conditioner host, and the control main board 400 is used for controlling the inverter cooling device to work, and in addition, the control main board can also receive an air conditioner host operation mode signal and control the cooling device according to the air conditioner host operation mode.
The invention also provides an air conditioning unit, which comprises an air conditioning unit host, a photovoltaic power generation system, a frequency converter and the frequency converter cooling device, wherein the air conditioning unit host is used for realizing the operation of the air conditioning unit, the frequency converter cooling device and the frequency converter are arranged in the frequency converter cabinet 300 together, and the structure of the frequency converter cooling device is described above and is not repeated herein.
Referring to fig. 3, the present invention further provides a method for controlling the cooling device of the frequency converter, including the following steps:
s100, when the circulating cooling system of the air conditioner unit does not operate, controlling the refrigerant cooling system and the chilled water cooling system to work;
and S200, when the circulating cooling system of the air conditioning unit runs, controlling the cooling water cooling system to work.
Specifically, the step S100 of controlling the refrigerant cooling system and the chilled water cooling system to operate includes the steps of:
controlling the operation of the compressor 110 in the refrigerant cooling system;
controlling the second fan 121 of the cooling assembly 120 in the refrigerant cooling system to work;
controlling the throttle device 140 on the conduit in the refrigerant cooling system disposed between the cooling assembly 120 and the heat exchanger assembly 130 to open;
controlling a water pump 231 in the chilled water cooling system to work;
controlling the first fan 227 of the dehumidification evaporator assembly 220 in the chilled water cooling system to operate;
the first switching element 241 provided on the chilled water outlet pipe in the chilled water cooling system is controlled to be turned on.
At this moment, the refrigerated water among the cooling water system cools off with refrigerant heat transfer in double-pipe heat exchanger, gain the cold source, the refrigerated water passes through water pump 231, the dehumidification is carried out in the check valve 232 reachs dehumidification evaporator assembly 220 earlier, give the frequency conversion cabinet 300 body cooling simultaneously (the air through in the dehumidification evaporator assembly 220 realizes in frequency conversion cabinet 300 mesocycle), later the refrigerated water gets into frequency conversion cooling module and cools down the frequency conversion module, get back to heat exchange assembly and refrigerant heat transfer cooling again, so circulation, reach the effect of frequency conversion dehumidification cooling.
Specifically, the step S200 of controlling the operation of the cooling water cooling system includes the following steps:
controlling a second switch component 251 arranged on a chilled water inlet pipe of an air conditioner main unit in the chilled water cooling system to be opened;
controlling a water pump 231 in the chilled water cooling system to work;
controlling the first fan 227 of the dehumidification evaporator assembly 220 in the chilled water cooling system to operate;
and controlling the opening of a third switch assembly 261 arranged on a chilled water outlet pipe of the air conditioner main unit in the chilled water cooling system.
At this moment, the refrigerated water of getting the cold source among the air conditioning unit circulative cooling system advances the pipe through air conditioner host refrigerated water and passes through water pump 231 in proper order, one-way valve 232 dehumidifies in arriving dehumidification evaporator assembly 220 first, give inverter cabinet 300 body cooling simultaneously (the air through in the dehumidification evaporator assembly 220 realizes in inverter cabinet 300 circulation), later the refrigerated water gets into frequency conversion cooling module and cools down the frequency converter module, rethread air conditioner host refrigerated water exit tube gets into air conditioning unit circulative cooling system and gets the cold source after through getting air conditioner host refrigerated water again and advances the pipe, so circulation, reach the effect of frequency converter dehumidification cooling.
In the control method of the frequency converter cooling device, when the air conditioner main machine does not operate, namely the circulating cooling system of the air conditioning unit does not operate, for example, the air conditioner main machine does not operate in the photovoltaic air conditioning unit, and only the photovoltaic power generation system operates, the heat productivity of the frequency converter is low, the needed cold source is less, and the cooling requirement of the frequency converter can be met by utilizing the cold source in the refrigerant cooling system of the frequency converter cooling device. When the air conditioner main unit operates, the air conditioner unit circulating cooling system operates, for example, when the air conditioner main unit operates in the photovoltaic air conditioner unit, and the photovoltaic power generation system operates or does not operate, the heat productivity of the frequency converter is large, and the cooling requirement of the frequency converter is met by utilizing a cold source in the air conditioner main unit circulating cooling system.
As an alternative embodiment, the control method of the frequency converter cooling device further comprises the following steps:
s300, obtaining the frequency converter cooling temperature measured by a second temperature sensor 211 arranged at the joint of the chilled water outlet pipe and the frequency converter cooling module 210, and comparing the frequency converter cooling temperature with a first preset temperature and a second preset temperature;
s400, when the temperature of the variable-frequency cooler is higher than a first preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be increased;
and S500, when the temperature of the variable-frequency cooler is lower than a second preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be reduced.
Specifically, the control of the increase of the cooling efficiency of the variable-frequency cooling device in the step S400 may be implemented in the following manners, which may be implemented individually or in combination.
A first possible embodiment is to increase the flow of chilled water in a chilled water cooling system.
For example, when the water pump 231 provided on the chilled water inlet pipe is the variable frequency water pump 231, the flow rate of the chilled water in the chilled water cooling system may be increased by increasing the frequency of the variable frequency water pump 231.
A second possible embodiment is to increase the refrigeration efficiency of the refrigerant cooling system.
For example, when the compressor 110 in the refrigerant cooling system is the inverter compressor 110, the refrigeration efficiency of the refrigerant cooling system may be increased by increasing the frequency of the compressor 110.
A third possible embodiment is to increase the amount of chilled water introduced from the hydronic system of the air conditioning unit.
For example, the opening degree of the second switch component 251 arranged on the chilled water inlet pipe of the main air conditioner is controlled to increase the flow rate of the chilled water in the circulating cooling system of the air conditioning unit introduced through the chilled water inlet pipe of the main air conditioner.
Specifically, the control of the reduction of the cooling efficiency of the variable-frequency cooling device in the step S500 may be implemented in the following manners, which may be implemented individually or in combination.
A first possible embodiment is to reduce the flow of chilled water in a chilled water cooling system.
For example, when the water pump 231 provided on the chilled water inlet pipe is the variable frequency water pump 231, the flow rate of the chilled water in the chilled water cooling system may be increased by decreasing the frequency of the variable frequency water pump 231.
A second possible implementation is to reduce the refrigeration efficiency of the refrigerant cooling system.
For example, when the compressor 110 in the refrigerant cooling system is the inverter compressor 110, the refrigeration efficiency of the refrigerant cooling system may be increased by reducing the frequency of the compressor 110.
A third possible embodiment is to reduce the amount of chilled water introduced from the air conditioning unit hydronic system.
For example, the opening degree of the second switch component 251 arranged on the chilled water inlet pipe of the main air conditioner is controlled to reduce the flow rate of the chilled water in the circulating cooling system of the air conditioning unit introduced through the chilled water inlet pipe of the main air conditioner.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (16)
1. The frequency converter cooling device is characterized by comprising a refrigerant cooling system and a chilled water cooling system;
the refrigerant cooling system comprises a compressor (110), a cooling assembly (120) and a heat exchanger assembly (130), wherein a gas outlet of the compressor (110), the cooling assembly (120), the heat exchanger assembly (130) and a gas suction port of the compressor (110) are sequentially connected through pipelines to form a refrigerant circuit;
the chilled water cooling system comprises a chilled water inlet pipe, a chilled water outlet pipe and a frequency converter cooling module (210), wherein the chilled water inlet pipe, the frequency converter cooling module (210), the chilled water outlet pipe and the heat exchanger assembly (130) are sequentially connected to form a chilled water loop, and the frequency converter cooling module (210) is used for cooling the frequency converter;
chilled water in the chilled water circuit exchanges heat with refrigerant in the refrigerant circuit in the heat exchanger assembly (130).
2. The inverter cooling device according to claim 1, wherein the chilled water cooling system comprises a dehumidification evaporator assembly (220), the dehumidification evaporator assembly (220) being disposed on the chilled water inlet pipe.
3. The frequency converter cooling device according to claim 2, wherein the dehumidifying evaporator assembly (220) comprises a casing (221), a first fan (227) and a first heat exchanger (228), the casing (221) is provided with an air return opening (222) and an air outlet (224), the first fan (227) and the first heat exchanger (228) are arranged in the casing (221), and the first fan (227) is used for making air flow through the first heat exchanger (228) after entering the casing (221) from the air return opening (222) and then flow out of the casing (221) from the air outlet (224).
4. Frequency converter cooling arrangement according to claim 3, wherein the dehumidifying evaporator assembly (220) further comprises a first temperature sensor (223), the first temperature sensor (223) being arranged at the return air opening (222).
5. Frequency converter cooling arrangement according to claim 3, characterized in that a water tray (225) is provided at the bottom of the housing (221).
6. The frequency converter cooling device according to claim 5, characterized in that a bent water trap (226) is arranged at the bottom of the water pan (225), and the water pan (225) is communicated with the outside of the frequency converter cabinet (300) through the water trap.
7. The frequency converter cooling device according to any one of claims 2 to 6, wherein the chilled water cooling system comprises an air conditioner main chilled water inlet pipe and an air conditioner main chilled water outlet pipe;
the first end of the chilled water inlet pipe of the air-conditioning main unit is connected to the chilled water inlet pipe, and the chilled water inlet pipe of the air-conditioning main unit is used for introducing chilled water of a circulating cooling system of an air-conditioning unit into the chilled water cooling system;
the first end of the air conditioner main machine chilled water outlet pipe is connected to the chilled water outlet pipe, and the air conditioner main machine chilled water outlet pipe is used for conveying chilled water after the heat exchange of the chilled water cooling system back to the air conditioning unit circulating cooling system.
8. The inverter cooling device according to claim 7, wherein the connection point of the main air conditioner chilled water inlet pipe and the chilled water inlet pipe is located between the dehumidification evaporator assembly (220) and the heat exchanger assembly (130).
9. The frequency converter cooling device according to claim 7, wherein a first switch assembly (241) is provided on the chilled water outlet pipe; the first end of the air conditioner main machine chilled water outlet pipe and the connection point of the chilled water outlet pipe are positioned between the first switch component (241) and the frequency converter cooling module (210).
10. The frequency converter cooling arrangement according to claim 1, characterized in that a second temperature sensor (211) is provided at the connection of the chilled water outlet pipe and the frequency converter cooling module (210).
11. Air conditioning assembly, characterized in that it comprises an inverter and an inverter cooling device according to any one of claims 1 to 17, the inverter cooling module (210) being intended for cooling the inverter.
12. A control method of a cooling apparatus of an inverter according to claim 7, characterized by comprising the steps of:
and when the circulating cooling system of the air conditioner unit is not operated, controlling the refrigerant cooling system and the chilled water cooling system to work.
13. The control method according to claim 12, wherein the controlling the refrigerant cooling system and the chilled water cooling system to operate includes the steps of:
controlling operation of a compressor (110) in a refrigerant cooling system;
controlling the second fan (121) of the cooling assembly (120) in the refrigerant cooling system to work;
controlling opening of a throttling device (140) arranged on a pipeline between a cooling assembly (120) and a heat exchanger assembly (130) in the refrigerant cooling system;
controlling a water pump (231) in the chilled water cooling system to work;
controlling a first fan (227) of a dehumidification evaporator assembly (220) in a chilled water cooling system to operate;
and controlling a first switch component (241) arranged on the chilled water outlet pipe in the chilled water cooling system to be opened.
14. The control method according to claim 12, characterized by comprising the steps of:
and when the circulating cooling system of the air conditioning unit operates, controlling the cooling water cooling system to work.
15. The control method according to claim 14, wherein the controlling the operation of the cooling water cooling system comprises the steps of:
controlling a second switch component (251) arranged on a chilled water inlet pipe of an air conditioner main unit in the chilled water cooling system to be opened;
controlling a water pump (231) in the chilled water cooling system to work;
controlling a first fan (227) of a dehumidification evaporator assembly (220) in a chilled water cooling system to operate;
and controlling a third switch component (261) arranged on a chilled water outlet pipe of the air conditioner main unit in the chilled water cooling system to be opened.
16. The control method according to any one of claims 12 to 15, characterized by further comprising the steps of:
obtaining the cooling temperature of the frequency converter measured by a second temperature sensor (211) arranged at the joint of the chilled water outlet pipe and the frequency converter cooling module (210), and comparing the cooling temperature of the frequency converter with a first preset temperature and a second preset temperature, wherein the first preset temperature is higher than the second preset temperature;
when the temperature of the variable-frequency cooler is higher than the first preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be increased,
and when the cooling temperature of the variable-frequency cooler is lower than the second preset temperature, controlling the cooling efficiency of the variable-frequency cooling device to be reduced.
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| CN201611042631.5A CN106546045B (en) | 2016-11-21 | 2016-11-21 | Frequency converter cooling device, air conditioning unit and control method |
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| CN115031384A (en) * | 2022-06-15 | 2022-09-09 | 珠海格力电器股份有限公司 | Heat dissipation device, heat dissipation unit, heat dissipation control method and heat dissipation control device |
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