CN113551329A - Frequency converter cooling system and method - Google Patents
Frequency converter cooling system and method Download PDFInfo
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- CN113551329A CN113551329A CN202010333722.4A CN202010333722A CN113551329A CN 113551329 A CN113551329 A CN 113551329A CN 202010333722 A CN202010333722 A CN 202010333722A CN 113551329 A CN113551329 A CN 113551329A
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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
- 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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid 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
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- Air Conditioning Control Device (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention claims a frequency converter cooling system and a method, wherein the cooling system comprises a condenser, a frequency converter, an economizer, an evaporator, a throttling device, a compressor, an inlet pipeline, a first outlet pipeline and a second outlet pipeline, the frequency converter is communicated with the condenser through the inlet pipeline, and a flow regulating valve is arranged on the inlet pipeline; the frequency converter is communicated with the economizer through a first outlet pipeline, and a first flow control valve is arranged on the first outlet pipeline; the frequency converter is communicated with the evaporator through a second outlet pipeline, and a second flow control valve is arranged on the second outlet pipeline. The invention can enable the frequency converter to always operate within the temperature reference range of the frequency converter, thereby playing a role in preventing the frequency converter from dewing and further having the function of prolonging the service life of the frequency converter; meanwhile, the refrigerant passing through the frequency converter can be selectively returned by the economizer or the evaporator according to the requirement, and the cooling effect of the cooling system is further ensured.
Description
Technical Field
The invention belongs to the technical field related to cooling of air conditioner frequency converters, and particularly relates to a frequency converter cooling system and a frequency converter cooling method.
Background
The inverter air conditioner is an air conditioner with an inverter, wherein the inverter is a control system used for controlling and adjusting the rotating speed of the compressor, so that the compressor is always in the optimal rotating speed state, the energy efficiency ratio is improved, and the energy-saving effect is achieved.
At present, the cooling mode of the existing frequency conversion air conditioner up-converter mainly uses air cooling, the air cooling frequency converter occupies the space of a machine room, wiring is carried out on the site of a user, the machine room needs to be ventilated and other inconvenient factors, and part of frequency conversion air conditioners adopt a refrigerant to cool the frequency converter, so that the inconvenient factors of the air cooling frequency converter are solved. The liquid refrigerant of the refrigerant value condenser used in the cooling of the frequency converter utilizes the phase change of the refrigerant to cool the heating element of the frequency converter, and the phase change cooling effect is good, however, the frequency converter is operated under partial working conditions of the frequency conversion air conditioner, the condensation phenomenon can be caused along with the operation, and therefore the service life of electronic components in the frequency converter is influenced.
Disclosure of Invention
In view of the above, it is necessary to provide a cooling system and method for an inverter, which solve the technical problems in the prior art.
The compressor and the condenser are respectively communicated with the economizer and the evaporator and form a channel for circulating a refrigerant; the cooling system further includes:
the frequency converter is communicated with the condenser through the inlet pipeline, and a flow regulating valve is arranged on the inlet pipeline;
the frequency converter is communicated with the economizer through the first outlet pipeline, and a first flow control valve is arranged on the first outlet pipeline;
and the frequency converter is communicated with the evaporator through the second outlet pipeline, and a second flow control valve is arranged on the second outlet pipeline.
As a preferable scheme of the present invention, the inlet pipeline is communicated with a capillary pipeline, and the refrigerant in the inlet pipeline can be communicated with the frequency converter through the capillary pipeline.
As a preferable aspect of the present invention, the number of the flow rate adjustment valves is two, and the two flow rate adjustment valves are respectively defined as a first flow rate adjustment valve and a second flow rate adjustment valve, and one of connection nodes between the inlet pipe and the capillary pipe is provided at a position between the first flow rate adjustment valve and the second flow rate adjustment valve.
As a preferable aspect of the present invention, the inlet pipeline, the first outlet pipeline, and the second outlet pipeline are respectively provided with a flow stop valve.
As a preferable aspect of the present invention, the number of the flow blocking valves is two, and the two flow blocking valves are respectively located at two outer sides of the corresponding inlet pipeline, the corresponding first outlet pipeline, or the corresponding second outlet pipeline.
As a preferable aspect of the present invention, a temperature sensor is provided on the frequency converter, and a comparison result between a temperature value measured by the temperature sensor and a temperature reference range of the frequency converter is used as a control signal to control the flow opening degree of the flow rate adjustment valve.
As a preferable embodiment of the present invention, the condenser, the economizer, and the evaporator are respectively provided with a pressure sensor, and the opening and closing of the first outlet line and the second outlet line are controlled by using a pressure difference between the evaporator and the condenser and a pressure difference between the evaporator and the economizer as control signals.
The invention also requests to protect a frequency converter cooling method, which is applied to any one of the frequency converter cooling systems, and the cooling method comprises the following steps:
acquiring the temperature of the frequency converter, comparing the measured temperature value with the temperature reference range of the frequency converter, and controlling the flow opening of the flow regulating valve on the inlet pipeline by taking the temperature value as a control signal;
and acquiring the pressures of the condenser, the economizer and the evaporator, comparing the pressure difference between the evaporator and the condenser and between the evaporator and the economizer by using the measured pressure values, and controlling the opening and closing of the first outlet pipeline and the second outlet pipeline by using the pressure difference as a control signal.
As a preferable aspect of the present invention, in the step of controlling opening and closing of the first outlet line and the second outlet line:
judging the relation between the pressure difference between the evaporator and the condenser and a first reference pressure value, and the relation between the pressure difference between the evaporator and the economizer and a second reference pressure value;
if the pressure difference between the evaporator and the condenser is larger than a first reference pressure value and the pressure difference between the evaporator and the economizer is larger than a second reference pressure value, controlling the first outlet pipeline to be opened and the second outlet pipeline to be closed;
otherwise, the first outlet pipeline is controlled to be closed, and the second outlet pipeline is controlled to be opened.
As a preferred scheme of the present invention, in the step of controlling the flow opening of the flow regulating valve on the inlet pipeline, when the inlet pipeline is in a fully open state, the relationship between the temperature value measured by the frequency converter and the temperature reference range of the frequency converter is judged;
and if the frequency is larger than the preset value, the frequency converter controls the compressor to stop and gives an alarm.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the frequency converter cooling system and method provided by the invention, the frequency converter is enabled to always operate within the temperature reference range of the frequency converter through reasonable pipeline arrangement and structural arrangement of the flow regulating valve, so that the function of preventing dewing on the frequency converter is achieved, and the service life of the frequency converter is further prolonged; meanwhile, the first flow control valve and the second flow control valve can be used for controlling the opening and closing of the first outlet pipeline and the second outlet pipeline, so that the refrigerant passing through the frequency converter can be selectively returned by the economizer or the evaporator according to the requirement, and the cooling effect of the cooling system is further ensured.
Drawings
Fig. 1 is a schematic structural diagram of a cooling system of an inverter according to an embodiment of the present invention.
Fig. 2 is a flowchart of the cooling-medium cooling start-up control in the cooling method of the frequency converter provided by the present invention.
Fig. 3 is a flow chart of the cooling operation control of the refrigerant in the cooling method of the frequency converter provided by the present invention.
Fig. 4 is a flow chart of the operation control of the cooling medium cooling-low pressure ratio in the cooling method of the frequency converter provided by the invention.
Fig. 5 is a flow chart of the operation control of the cooling medium cooling high pressure ratio in the cooling method of the frequency converter provided by the invention.
Fig. 6 is a flowchart of refrigerant cooling shutdown control in the cooling method of the frequency converter according to the present invention.
10, a condenser; 20. a frequency converter; 30. an economizer; 40. an evaporator; 50. a compressor; 60. a throttling device; 101. an inlet line; 102. a first outlet line; 103. a second outlet line; 104. a capillary tube; 105. a flow stop valve; 201. a first flow control valve; 202. a second flow control valve; 203. a first flow regulating valve; 204. a second flow regulating valve; 205. a flow stop valve; 301. a temperature sensor; 302. a pressure sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 to 6, an inverter cooling system according to an embodiment of the present invention includes a condenser 10, an inverter 20, an economizer 30, an evaporator 40, a compressor 50, and a throttling device 60.
The compressor 50, the condenser 10, and the throttling device 60 are respectively communicated with the economizer 30 and the evaporator 40 to form a channel for circulating a refrigerant. It should be noted that the condenser 10, the throttling device 60 and the economizer 30, the throttling device 60 and the evaporator 40 of the present embodiment are communicated, so that the compressor 50 can cool or heat the external air according to the use requirement when operating, and the conversion of the refrigerant among the economizer 30, the evaporator 40, the compressor 50 and the condenser 10, between the condenser 10 and the economizer 30, and between the economizer 30 and the evaporator 40 and the form thereof into the prior art is not described herein.
In the present embodiment, the cooling system of the present embodiment further includes an inlet piping 101, a first outlet piping 102, and a second outlet piping 103.
The condenser 10 is connected and communicated with the frequency converter 20 through an inlet pipeline 101, and the inlet pipeline 101 is provided with a flow regulating valve for controlling the flow of the refrigerant flowing from the bottom of the condenser 10 to the frequency converter 20 on the inlet pipeline 101; the frequency converter 20 is connected and communicated with the economizer 30 through a first outlet pipeline 102, and a first flow control valve 201 is arranged on the first outlet pipeline 102 and used for controlling the opening and closing of a return air passage which flows from the frequency converter 20 to the economizer 30 on the first outlet pipeline 102; the inverter 20 is connected and communicated with the evaporator 40 by a second outlet pipe 103, and a second flow control valve 202 is provided on the second outlet pipe 103 for controlling the opening/closing of a return air passage from the inverter 20 to the evaporator 40 on the second outlet pipe 103. That is, in the cooling system of the present embodiment, the inverter 20 can selectively return air to the economizer 30 or the evaporator 40 according to the pressure, thereby ensuring the cooling effect when the cooling system is operated. It should be noted that the first flow control valve 201 and the second flow control valve 202 are in an open/close operating state to ensure that the refrigerant on the inverter 20 in the cooling system can return air, and the first flow control valve 201 and/or the second flow control valve 202 may be specifically an electric control valve, an electronic expansion valve, a thermostatic expansion valve, an electromagnetic valve, and the like, and can close the corresponding first outlet pipeline 102 and the corresponding second outlet pipeline 103.
In the present embodiment, the inlet pipeline 101 is communicated with the capillary pipeline 104, and the refrigerant in the inlet pipeline 101 can be communicated with the frequency converter 20 through the capillary pipeline 104, so as to ensure that a small amount of liquid refrigerant in the inlet pipeline 101 cools the frequency converter 20 all the time when the cooling system operates, and further prevent the temperature of the frequency converter 20 from greatly fluctuating in the process of adjusting the refrigerant flow flowing from the condenser 10 to the frequency converter 20 by the flow adjusting valve of the cooling system. It should be noted that the pipe diameter of the capillary line 104 is smaller than the pipe diameter of the inlet line 101, so that the inlet line 101 can always flow a small amount of refrigerant to the frequency converter 20 through the capillary line 104.
As can be seen from the above, the flow regulating valve is applied to the inlet pipeline 101 for regulating the flow rate of the refrigerant flowing to the frequency converter 20, so as to control the temperature of the frequency converter 20 during operation, so that the frequency converter 20 always operates within the temperature reference range of the frequency converter 20, thereby performing the anti-condensation function on the frequency converter 20, and further prolonging the service life of the frequency converter 20.
Specifically, the number of the flow rate adjustment valves of the present embodiment is two, which are defined as a first flow rate adjustment valve 203 and a second flow rate adjustment valve 204, respectively, wherein one of the connection nodes between the inlet line 101 and the capillary line 104 is provided at a position between the first flow rate adjustment valve 203 and the second flow rate adjustment valve 204. The cooling system uses two flow regulating valves to regulate the refrigerant flowing from the inlet pipeline 101 to the frequency converter 20, and when the cooling system is used, the flow opening degree of the first flow regulating valve 203 adjacent to one side of the frequency converter 20 can be regulated firstly, and when the flow opening degree regulated by the first flow regulating valve 203 cannot meet the requirement of regulating the temperature of the frequency converter 20, the flow opening degree of the second flow regulating valve 204 is regulated. It should be noted that, one of the connection nodes of the inlet pipeline 101 and the capillary pipeline 104 specifically refers to a position where the refrigerant in the inlet pipeline 101 flows to the capillary pipeline 104, and the other connection node of the capillary pipeline 104 is specifically disposed on the inlet pipeline 101, and the first flow rate adjusting valve 203 is located between the two connection nodes of the capillary pipeline 104, but of course, the other connection node of the capillary pipeline 104 may also be disposed at a position where the frequency converter 20 is located, that is, one end of the capillary pipeline 104 is connected and communicated with the inlet pipeline 101, and the other end is connected and communicated with the frequency converter 20. It should be noted that the first flow regulating valve 203 and/or the second flow regulating valve 204 may be specifically an electric regulating valve, an electronic expansion valve, a thermal expansion valve, an electromagnetic valve, etc., wherein the first flow regulating valve 203 can be used for regulating or closing the flow rate of the liquid refrigerant on the inlet line 101, and the second flow regulating valve 204 is used for regulating or closing the amount of the refrigerant extracted from the condenser 10 by the inlet line 101.
As a preferable aspect of the present invention, in the cooling system of the present embodiment, the inlet pipeline 101, the first outlet pipeline 102, and the second outlet pipeline 103 are respectively provided with a flow stop valve 205, and the flow stop valve 205 may be specifically a valve having a shut-off function, such as a ball valve or a gate valve, for closing the inlet pipeline 101, the first outlet pipeline 102, and the second outlet pipeline 103, respectively, so as to facilitate the inspection or maintenance of the parts on the inlet pipeline 101, the first outlet pipeline 102, and the second outlet pipeline 103. That is, the flow shutoff valves 205 in the inlet line 101, the first outlet line 102, and the second outlet line 103 according to the present embodiment are normally open, and when maintenance or repair is required, the corresponding lines are closed by the flow shutoff valves 205. It should be noted that, in the present embodiment, a part of the pipe section can be shared between the first outlet pipeline 102 and the second outlet pipeline 103, so that the three flow shutoff valves 105 can be used to close the first outlet pipeline 102 and the second outlet pipeline 103.
Specifically, the number of the flow cut-off valves 205 on each line is two, and two flow cut-off valves 205 are divided on both outer sides of the corresponding inlet line 101, the corresponding first outlet line 102, or the corresponding second outlet line 103. When the cooling system overhauls or maintains the inlet pipeline 101, the first outlet pipeline 102 and the second outlet pipeline 103, the corresponding two flow stop valves 205 can be closed. In the present embodiment, the two flow blocking valves 205 are provided on both outer sides of the inlet pipe 101, the first outlet pipe 102, or the second outlet pipe 103, and specifically, the two flow blocking valves 205 are provided on both sides of the corresponding flow control valves, the first flow control valve 201, and the second flow control valve 202, on the inlet pipe 101, the first outlet pipe 102, and the second outlet pipe 103.
In the present embodiment, the inverter 20 is provided with the temperature sensor 301 for detecting the temperature of the inverter 20 during operation in real time, and the cooling system can control the flow opening degree of the flow rate adjustment valve using the comparison result between the temperature value measured by the temperature sensor 301 and the temperature reference range of the inverter 20 as control information. That is, in the present embodiment, the adjustment of the flow opening degree of the first flow rate adjustment valve 203 and the second flow rate adjustment valve 204 can be determined based on the real-time comparison result between the temperature value measured by the temperature sensor 301 and the temperature reference range of the inverter 20.
Specifically, the temperature reference range of the frequency converter 20 of the present embodiment is 20 ° to 60 °, that is, the temperature of the frequency converter 20 during operation cannot be lower than 20 ° and cannot be higher than 60 °, and the flow opening degree of the first flow regulating valve 203 is first adjusted as needed, and then the flow opening degree of the second flow regulating valve 204 is adjusted as needed, so that the temperature value of the frequency converter 20 during operation, measured by the temperature sensor 301, is always between 20 ° and 60 °. Of course, it should be noted that the temperature reference range of the frequency converter 20 can be specifically adjusted according to the operating conditions applied to the cooling system, and will not be described herein.
In the cooling system of the present embodiment, the condenser 10, the economizer 30, and the evaporator 40 are provided with pressure sensors 302, respectively, and the cooling system can control opening and closing of the first outlet line 102 and the second outlet line 103 using a differential pressure between the evaporator 40 and the condenser 10 and a differential pressure between the evaporator 40 and the economizer 30 as control signals.
For convenience of description, it is defined that the condensing pressure of the condenser 10 on the cooling system of the present embodiment is Pc, the intermediate pressure of the economizer 30 is Pm, the evaporating pressure of the evaporator 40 is Pe, and the pressure difference between the evaporator 40 and the condenser 10 needs to satisfy the condition of Pe +200kPa < Pc, and the pressure difference between the evaporator 40 and the economizer 30 needs to satisfy the condition of Pe +100kPa < Pm. Of course, it should be noted that the pressure difference condition among the evaporator 40, the condenser 10 and the economizer 30 can be specifically adjusted according to the operating conditions of the cooling system, and will not be described herein.
It is understood that, when the pressure difference among the evaporator 40, the condenser 10 and the economizer 30 in the cooling system of the present embodiment satisfies the above condition, the cooling system is in a high pressure ratio operation state, and the inverter 20 returns to the economizer 30 through the first outlet line 102; on the contrary, when the pressure difference among the evaporator 40, the condenser 10 and the economizer 30 does not satisfy one of the above conditions, the cooling system is in a low pressure ratio operation state, and the inverter 20 returns to the evaporator 40 through the second outlet line 103. That is, the cooling system of the present embodiment can select the return air from the first outlet line 102 or the second outlet line 103 according to the pressure among the condenser 10, the economizer 30, and the evaporator 40, and further has an effect of ensuring the cooling effect of the cooling system on the inverter 20 when the cooling system is in operation.
The invention also requests to protect a cooling method of the frequency converter, which is applied to the frequency converter cooling system, wherein the cooling method comprises the following steps:
acquiring the temperature of the frequency converter 20, comparing the measured temperature value with the temperature reference range of the frequency converter 20, and controlling the flow opening of the flow regulating valve on the inlet pipeline 101 by taking the temperature value as a control signal;
the pressures of the condenser 10, the economizer 30 and the evaporator 40 are obtained, the pressure differences between the evaporator 40 and the condenser 10 and between the evaporator 40 and the economizer 30 are compared by using the measured pressure values, and the pressure differences are used as control signals to control the opening and closing of the first outlet pipeline 102 and the second outlet pipeline 103.
Wherein, in the step of controlling the opening and closing of the first outlet pipeline 102 and the second outlet pipeline 103:
judging a relationship between a pressure difference between the evaporator 40 and the condenser 10 and a first reference pressure value, and a relationship between a pressure difference between the evaporator 40 and the economizer 30 and a second reference pressure value;
if the pressure difference between the evaporator 40 and the condenser 10 is greater than a first reference pressure value and the pressure difference between the evaporator 40 and the economizer 30 is greater than a second reference pressure value, controlling the first outlet pipeline 102 to be opened and the second outlet pipeline 103 to be closed;
otherwise, the first outlet pipeline 102 is controlled to be closed, and the second outlet pipeline 103 is controlled to be opened.
From the above, in the cooling method of the present embodiment, the first reference pressure value is 200kPa, and the second reference pressure value is 100 kPa. Of course, it should be noted that the first reference pressure value and the second reference pressure value are not limited to those shown above, and those skilled in the art may modify the pressure values according to different working conditions.
Further, in the cooling method of the present embodiment, in the step of controlling the flow opening degree of the flow rate adjustment valve on the inlet pipeline 101, when the inlet pipeline 101 is in the fully open state, the relationship between the temperature value measured by the frequency converter 20 and the temperature reference range of the frequency converter 20 is determined; if the value is larger than the preset value, the frequency converter 20 controls the compressor 50 to stop and give an alarm. That is, when the temperature value measured by the temperature sensor 301 cannot fall to the temperature reference range of the inverter 20, the inverter 20 controls the compressor 50 to stop and alarm, thereby preventing the inverter 20 from working under load. The refrigerant flows through the inlet pipe 101 when the inlet pipe 101 is fully opened, specifically, when the flow opening degrees of the first flow rate adjustment valve 203 and the second flow rate adjustment valve 204 are adjusted to the maximum.
As can be seen from the above, the inverter cooling system according to the present embodiment can adopt different control methods according to different operation processes, so as to meet the use requirement for cooling the inverter 20.
It can be understood that the cooling method of the inverter according to the present embodiment can be divided into a refrigerant cooling start-up control, a refrigerant cooling shut-down control, and a refrigerant cooling operation control, and the refrigerant cooling operation control can be specifically divided into a refrigerant cooling high pressure ratio operation and a refrigerant cooling low pressure ratio operation.
Specifically, the cooling and starting control of the refrigerant in the cooling method of the frequency converter is as follows: when the cooling system receives a starting command, the first flow regulating valve 203, the second flow regulating valve 204 and the second flow regulating valve 202 are fully opened, the first flow regulating valve 201 is closed, the temperature T1 of the frequency converter 20 is detected by the temperature sensor 301, whether T1 is in the temperature range of the frequency converter 20 is judged, if T1 is smaller than the lowest allowable temperature of the frequency converter 20, the state of the first flow regulating valve 203 is detected, if the first flow regulating valve 203 is in an opening state, the flow opening degree of the first flow regulating valve 203 is reduced until T1 meets an allowable requirement, and if the first flow regulating valve 203 is in a closing state, the flow opening degree of the second flow regulating valve 204 is reduced until T1 meets the allowable requirement; if T1 is higher than the maximum allowable temperature of the frequency converter 20, detecting the state of the first flow regulating valve 203, if the first flow regulating valve 203 is in a full-open state, detecting the state of the second flow regulating valve 204, if the second flow regulating valve 204 is also in a full-open state, the frequency converter 20 controls the compressor 50 to stop and give an alarm, if the second flow regulating valve 204 is not in a full-open state, increasing the flow opening degree of the second flow regulating valve 204 until T1 meets the allowable requirement, and if the first flow regulating valve 203 is not in a full-open state, increasing the flow opening degree of the first flow regulating valve 203 until T1 meets the allowable requirement, and when the target requirement is met, the starting control process is finished.
When the cooling operation of the refrigerant in the cooling method of the frequency converter is controlled, the following conditions are met according to the pressure difference among the condenser 10, the economizer 30 and the evaporator 40: pe +200kPa < Pc, and Pe +100kPa < Pm, if satisfied, the refrigerant cools the high pressure ratio operation, otherwise, the refrigerant cools the low pressure ratio operation.
Specifically, the cooling method of the frequency converter comprises the following steps of controlling the operation of the cooling medium at a low pressure ratio: judging whether the second flow control valve 202 is in an open state, if not, opening the second flow control valve 202, closing the first flow control valve 201 to enable the frequency converter 20 to be communicated with the evaporator 40, detecting the temperature T1 of the frequency converter 20 by using a temperature sensor 301, judging whether the temperature T1 is in the temperature range of the frequency converter 20, if the temperature T1 is smaller than the lowest allowable temperature of the frequency converter 20, detecting the state of the first flow control valve 203, if the first flow control valve 203 is in the open state, reducing the flow opening degree of the first flow control valve 203 until the temperature T1 reaches an allowable requirement, and if the first flow control valve 203 is in the closed state, reducing the flow opening degree of the second flow control valve 204 until the temperature T1 reaches the allowable requirement; if T1 is higher than the maximum allowable temperature of the frequency converter 20, detecting the state of the first flow regulating valve 203, if the first flow regulating valve 203 is in a full-open state, detecting the state of the second flow regulating valve 204, if the second flow regulating valve 204 is also in a full-open state, the frequency converter 20 controls the compressor 50 to stop and give an alarm, if the second flow regulating valve 204 is not in a full-open state, increasing the flow opening degree of the second flow regulating valve 204 until T1 meets the allowable requirement, if the first flow regulating valve 203 is not in a full-open state, increasing the flow opening degree of the first flow regulating valve 203 until T1 meets the allowable requirement, and when the target requirement is met, ending the control process.
When the cooling method of the frequency converter is used, the operation control of the cooling high pressure ratio of the refrigerant is as follows: judging whether the first flow control valve 201 is in an open state, if not, opening the first flow control valve 201, closing the second flow control valve 202 to enable the frequency converter 20 to be communicated with the economizer 30, detecting the temperature T1 of the frequency converter 20 by using a temperature sensor 301, judging whether T1 is in the temperature range of the frequency converter 20, if T1 is smaller than the lowest allowable temperature of the frequency converter 20, detecting the state of the first flow control valve 203, if the first flow control valve 203 is in the open state, reducing the flow opening degree of the first flow control valve 203 until T1 reaches an allowable requirement, and if the first flow control valve 203 is in the closed state, reducing the flow opening degree of the second flow control valve 204 until T1 reaches the allowable requirement; if T1 is higher than the maximum allowable temperature of the frequency converter 20, detecting the state of the first flow regulating valve 203, if the first flow regulating valve 203 is in a full-open state, detecting the state of the second flow regulating valve 204, if the second flow regulating valve 204 is also in a full-open state, the frequency converter 20 controls the compressor 50 to stop and give an alarm, if the second flow regulating valve 204 is not in a full-open state, increasing the flow opening degree of the second flow regulating valve 204 until T1 meets the allowable requirement, if the first flow regulating valve 203 is not in a full-open state, increasing the flow opening degree of the first flow regulating valve 203 until T1 meets the allowable requirement, and when the target requirement is met, ending the control process.
The cooling method of the frequency converter comprises the following steps of: when the cooling system receives a shutdown command, the first flow regulating valve 203, the second flow regulating valve 204, the first flow control valve 201 and the second flow control valve 202 are kept unchanged, the temperature T1 of the frequency converter 20 is detected by the temperature sensor 301, whether the temperature T1 is in the temperature range of the frequency converter 20 is judged, if the temperature T1 is smaller than the lowest allowable temperature of the frequency converter 20, the flow opening degree of the second flow regulating valve 204 is reduced, if the temperature T1 is greater than the highest allowable temperature, the flow opening degrees of the first flow regulating valve 203 and the second flow regulating valve 204 are increased, meanwhile, the control system executes a shutdown program of the compressor 50, after the compressor 50 is shutdown, the first flow regulating valve 203, the second flow regulating valve 204, the first flow control valve 201 and the second flow control valve 202 are closed, and shutdown control is finished.
In summary, the frequency converter cooling system and method provided by the invention enable the frequency converter to always operate within the temperature reference range of the frequency converter through reasonable pipeline arrangement and structural arrangement of the flow regulating valve, thereby playing a role in preventing dewing on the frequency converter and further prolonging the service life of the frequency converter; meanwhile, the first flow control valve and the second flow control valve can be used for controlling the opening and closing of the first outlet pipeline and the second outlet pipeline, so that the refrigerant passing through the frequency converter can be selectively returned by the economizer or the evaporator according to the requirement, and the cooling effect of the cooling system is further ensured.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
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 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 (10)
1. A frequency converter cooling system comprises a condenser, a frequency converter, an economizer, an evaporator, a throttling device and a compressor, wherein the compressor and the condenser are respectively communicated with the economizer and the evaporator and form a channel for circulating a refrigerant; characterized in that the cooling system further comprises:
the frequency converter is communicated with the condenser through the inlet pipeline, and a flow regulating valve is arranged on the inlet pipeline;
the frequency converter is communicated with the economizer through the first outlet pipeline, and a first flow control valve is arranged on the first outlet pipeline;
and the frequency converter is communicated with the evaporator through the second outlet pipeline, and a second flow control valve is arranged on the second outlet pipeline.
2. The frequency converter cooling system according to claim 1, wherein the inlet pipeline is communicated with a capillary pipeline, and a refrigerant in the inlet pipeline can be communicated with the frequency converter through the capillary pipeline.
3. The inverter cooling system according to claim 2, wherein the number of the flow control valves is two, and is defined as a first flow control valve and a second flow control valve, respectively, and one of the connection nodes between the inlet pipe and the capillary pipe is provided at a position between the first flow control valve and the second flow control valve.
4. The frequency converter cooling system according to claim 1, wherein the inlet pipeline, the first outlet pipeline and the second outlet pipeline are respectively provided with a flow stop valve.
5. The frequency converter cooling system according to claim 4, wherein the number of the flow cut-off valves is two, and the two flow cut-off valves are respectively located on both outer sides of the corresponding inlet pipe, the corresponding first outlet pipe, or the corresponding second outlet pipe.
6. The frequency converter cooling system according to claim 1, wherein a temperature sensor is provided on the frequency converter, and a comparison result between a temperature value measured by the temperature sensor and a temperature reference range of the frequency converter is used as a control signal to control a flow opening degree of the flow regulating valve.
7. The frequency converter cooling system according to claim 1, wherein pressure sensors are respectively provided on the condenser, the economizer and the evaporator, and the opening and closing of the first outlet line and the second outlet line are controlled by using a pressure difference between the evaporator and the condenser and a pressure difference between the evaporator and the economizer as control signals.
8. An inverter cooling method applied to the inverter cooling system according to any one of claims 1 to 7, wherein the cooling method comprises:
acquiring the temperature of the frequency converter, comparing the measured temperature value with the temperature reference range of the frequency converter, and controlling the flow opening of the flow regulating valve on the inlet pipeline by taking the temperature value as a control signal;
and acquiring the pressures of the condenser, the economizer and the evaporator, comparing the pressure difference between the evaporator and the condenser and between the evaporator and the economizer by using the measured pressure values, and controlling the opening and closing of the first outlet pipeline and the second outlet pipeline by using the pressure difference as a control signal.
9. The inverter cooling method according to claim 8, wherein in the step of controlling the opening and closing of the first outlet line and the second outlet line:
judging the relation between the pressure difference between the evaporator and the condenser and a first reference pressure value, and the relation between the pressure difference between the evaporator and the economizer and a second reference pressure value;
if the pressure difference between the evaporator and the condenser is larger than a first reference pressure value and the pressure difference between the evaporator and the economizer is larger than a second reference pressure value, controlling the first outlet pipeline to be opened and the second outlet pipeline to be closed;
otherwise, the first outlet pipeline is controlled to be closed, and the second outlet pipeline is controlled to be opened.
10. The frequency converter cooling method according to claim 8, wherein in the step of controlling the flow opening degree of the flow rate adjustment valve on the inlet line, when the inlet line is in a fully open state, the relationship between the temperature value measured by the frequency converter and the temperature reference range of the frequency converter is judged;
and if the frequency is larger than the preset value, the frequency converter controls the compressor to stop and gives an alarm.
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Effective date of registration: 20221122 Address after: No. 608, Bihua Road, High tech Industrial Development Zone, Nantong, Jiangsu 226010 Applicant after: JIANGSU TONGSHENG HEAT EXCHANGER Co.,Ltd. Address before: 311835 Industrial Zone of Diankou Town, Zhuji City, Shaoxing City, Zhejiang Province Applicant before: ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT Co.,Ltd. |
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