WO2016187939A1 - Frequency control method and system for variable frequency compressor of heat pump hot water machine - Google Patents

Frequency control method and system for variable frequency compressor of heat pump hot water machine Download PDF

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Publication number
WO2016187939A1
WO2016187939A1 PCT/CN2015/084252 CN2015084252W WO2016187939A1 WO 2016187939 A1 WO2016187939 A1 WO 2016187939A1 CN 2015084252 W CN2015084252 W CN 2015084252W WO 2016187939 A1 WO2016187939 A1 WO 2016187939A1
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WIPO (PCT)
Prior art keywords
frequency
temperature
unit
water
water tank
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PCT/CN2015/084252
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French (fr)
Chinese (zh)
Inventor
张登科
Original Assignee
广东美的暖通设备有限公司
美的集团股份有限公司
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Application filed by 广东美的暖通设备有限公司, 美的集团股份有限公司 filed Critical 广东美的暖通设备有限公司
Priority to US15/501,122 priority Critical patent/US20180106483A1/en
Priority to EP15893020.6A priority patent/EP3299744A4/en
Publication of WO2016187939A1 publication Critical patent/WO2016187939A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/38—Control of compressors of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/258—Outdoor temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F24H4/04—Storage heaters
    • 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
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data

Definitions

  • the invention relates to the technical field of heat pump water heaters, in particular to a frequency control method and system for a frequency conversion heat pump water heater compressor.
  • variable frequency heat pump water heaters As a high-efficiency, energy-saving and environmentally friendly equipment, heat pump water heaters have been widely used at home and abroad in recent years. With the development of frequency conversion technology, variable frequency heat pump water heaters have emerged. Compared with the fixed-frequency heat pump water heater, the variable frequency heat pump water heater has the advantages of large heat generation and high energy efficiency, especially at low temperature and temperature.
  • the frequency control method adopted by the variable frequency heat pump water heater compressor is based on the difference between the target temperature of the water tank and the instantaneous temperature of the water tank, that is, when the temperature difference between the two is greater than a certain value, the compressor runs at a high frequency as much as possible.
  • the compressor frequency is dynamically adjusted. In order to ensure that the temperature of the water tank is stable within the target temperature range, the operating frequency of the compressor is usually low.
  • the heat generated by the variable frequency heat pump water heater generally increases with the frequency of the reduction machine, but the energy efficiency ratio changes parabolically. That is, when the compressor frequency is higher than a certain frequency, the energy efficiency ratio of the heat pump water heater is The compressor frequency increases and decreases. Below this frequency, the energy efficiency ratio of the heat pump water heater decreases as the compressor frequency decreases. It can be seen that the existing energy-saving advantages of the frequency conversion heat pump water heater by the temperature in the water tank control the frequency of the frequency conversion heat pump water heater compressor, and the reliability of the compressor cannot be guaranteed. In addition, the maximum pressure of the compressor also increases as the frequency increases, and then decreases as the frequency increases.
  • the object of the present invention is to solve at least one of the above technical problems to some extent.
  • a first object of the present invention is to provide a frequency control method for a variable frequency heat pump water heater compressor.
  • the method controls the frequency of the compressor through the water outlet temperature of the heat exchanger, and can effectively reduce the operating frequency of the inverter compressor when the water temperature of the water tank is low, and improve the energy efficiency of the operation of the unit, and at the same time, while ensuring a constant outlet water temperature, Effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
  • a second object of the present invention is to provide a frequency control system for a variable frequency heat pump water heater compressor.
  • a frequency control method for a variable frequency heat pump water heater compressor includes: detecting a water outlet temperature of a heat exchanger and a water tank temperature of a water tank; and generating the heat exchange according to the water tank temperature.
  • the effluent setting temperature of the device includes: detecting a water outlet temperature of a heat exchanger and a water tank temperature of a water tank; and generating the heat exchange according to the water tank temperature.
  • the effluent setting temperature of the device includes: detecting a water outlet temperature of a heat exchanger and a water tank temperature of a water tank; and generating the heat exchange according to the water tank temperature.
  • the effluent setting temperature of the device includes controlling the frequency of the inverter compressor according to the outlet temperature of the heat exchanger and the set temperature of the effluent.
  • the frequency control method of the variable frequency heat pump water heater compressor firstly detecting the water outlet temperature of the heat exchanger and the water tank temperature of the water tank, and then generating the set water temperature of the heat exchanger according to the temperature of the water tank, and according to the heat exchange
  • the outlet temperature and the outlet set temperature of the device control the frequency of the inverter compressor.
  • This embodiment proposes a method of controlling the frequency of the compressor through the outlet temperature of the heat exchanger, which can be effective when the water temperature of the water tank is low. Reduce the operating frequency of the inverter compressor, improve the energy efficiency of the unit operation, and at the same time, under the condition of ensuring the constant outlet water temperature, effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
  • T1S a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, a2 is a heat pump unit capacity correction coefficient, and a3 is another correction. Parameter, b is the temperature difference correction.
  • the controlling the frequency of the inverter compressor according to the water outlet temperature of the heat exchanger and the set water temperature of the heat exchanger comprises: obtaining the water outlet temperature of the heat exchanger And a temperature difference between the set temperature of the effluent; obtaining an interval in which the temperature difference is located, and obtaining a correction value according to the interval in which the temperature difference is located; generating the according to a current frequency of the inverter compressor and the correction value The target frequency of the inverter compressor.
  • control method further comprises: comparing a target frequency of the inverter compressor with a unit operable frequency of the set of operable frequencies of the unit; obtaining a closest to the target frequency
  • the unit can operate at a frequency and use the unit operating frequency as the target frequency.
  • the operating frequency of the unit as the target frequency specifically includes: acquiring a minimum frequency of operation of the unit and a maximum frequency of operation of the unit at the temperature of the water tank; The group operating minimum frequency and the unit operating maximum frequency; if the unit operable frequency is between the unit operating minimum frequency and the unit operating maximum frequency, the unit operable frequency is used as the target frequency.
  • the obtaining the minimum frequency of operation of the unit and the maximum frequency of operation of the unit at the temperature of the water tank comprises: determining a minimum frequency of operation of the unit and a maximum frequency of operation of the unit according to the outdoor environmental temperature T4 and the water tank temperature T5; When the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, the water tank temperature T5 is greater than or equal to the first When the temperature threshold is preset, the compressor operates in a first preset frequency range, and the minimum operating frequency of the unit and the maximum frequency of the unit operation are determined according to the first preset frequency range, wherein the first preset temperature threshold is less than The third preset temperature threshold; when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range, Determining
  • control method further comprises: if the unit can operate at a frequency greater than the unit The maximum frequency of the line is used as the target frequency of the unit operating maximum frequency; if the unit operable frequency is less than the unit operating minimum frequency, the unit operating minimum frequency is taken as the target frequency.
  • a frequency control system for an electric variable frequency heat pump water heater compressor includes: an inverter compressor; a heat exchanger connected to the inverter compressor; a first temperature sensor for detecting the outlet of the heat exchanger; a water tank connected to the heat exchanger; a second temperature sensor disposed in the water tank for detecting the water tank a water tank temperature controller for obtaining an outlet water temperature of the heat exchanger from the first temperature sensor, and obtaining an outlet water temperature of the water tank from the second temperature sensor, and then according to the water tank temperature
  • the outlet set temperature of the heat exchanger is generated, and the frequency of the inverter compressor is controlled according to the outlet temperature of the heat exchanger and the set temperature of the outlet.
  • the controller obtains the water outlet temperature of the heat exchanger from the first temperature sensor, and obtains the water tank temperature of the water tank from the second temperature sensor, and then according to the water tank
  • the set temperature of the effluent of the temperature generating heat exchanger, and the frequency of the variable frequency compressor are controlled according to the outlet temperature of the heat exchanger and the set temperature of the effluent.
  • This embodiment proposes a frequency conversion compression of the water passing through the heat exchanger.
  • the frequency of the machine is controlled.
  • the minimum operating frequency of the compressor can be effectively controlled to ensure compression under the condition that the outlet water temperature is constant. Machine reliability.
  • T1S a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, a2 is a heat pump unit capacity correction coefficient, and a3 is another correction. Parameter, b is the temperature difference correction.
  • the controller is specifically configured to: acquire a temperature difference between a water outlet temperature and a water set temperature of the heat exchanger; acquire an interval in which the temperature difference is located, and according to the The interval in which the temperature difference is located acquires a correction value; the target frequency of the inverter compressor is generated according to the current frequency of the inverter compressor and the correction value.
  • the controller is further configured to: compare a target frequency of the inverter compressor with a unit operable frequency in the set of operable frequencies of the unit; obtain the most A similar unit can operate at a frequency and use the unit operating frequency as the target frequency.
  • the controller is further configured to: acquire a minimum frequency of operation of the unit at the water tank temperature and a maximum frequency of operation of the unit; and operate the frequency of the unit and the minimum frequency of the group operation and The maximum operating frequency of the unit; if the operating frequency of the unit is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the operating frequency of the unit is taken as the target frequency.
  • the controller is further configured to: determine a minimum operating frequency of the unit and a maximum operating frequency of the unit according to the outdoor ambient temperature T4 and the water tank temperature T5; when the outdoor ambient temperature T4 is less than or equal to the first preset The temperature threshold, when the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the compressor operates at the first Determining, according to the first preset frequency range, a unit operating minimum frequency and a unit operating maximum frequency, wherein the first preset temperature threshold is less than the third preset temperature threshold; and the outdoor environment The temperature T4 is between the first preset temperature range, and when the water tank temperature T5 is between the second preset temperature range, the compressor operates at the second preset frequency range And determining, according to the first preset frequency range, a unit operating minimum frequency and a unit operating maximum frequency, wherein the first
  • the controller is further configured to: if the unit operable frequency is greater than a unit operating maximum frequency, use the unit operating maximum frequency as the target frequency; if the unit is operable If the frequency is less than the minimum frequency of operation of the unit, the minimum frequency of operation of the unit is taken as the target frequency.
  • FIG. 1 is a flow chart of a frequency control method of a variable frequency heat pump water heater compressor in accordance with one embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing an example of the principle of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
  • FIG. 1 is a flow chart of a frequency control method of a variable frequency heat pump water heater compressor in accordance with one embodiment of the present invention.
  • the frequency control method of the variable frequency heat pump water heater compressor may include:
  • the first temperature sensor disposed at the water outlet of the heat exchanger can detect the water outlet temperature of the heat exchanger, and the second temperature sensor disposed in the water tank can detect the water tank. Water tank temperature.
  • the water set temperature T1S of the heat exchanger can be generated by the following formula.
  • T5 is the tank temperature.
  • T1S a1*a2*a3*T5+b, where a1 is the water-water heat exchanger correction coefficient in the water tank, a2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
  • the water-water heat exchanger correction coefficient, the heat pump unit capacity correction coefficient, the correction parameter and the temperature difference correction coefficient in the water tank can be set according to actual use conditions, that is, under different use conditions,
  • the correction coefficient of the water-water heat exchanger in the above water tank, the correction coefficient of the heat pump unit capacity, the correction parameter and the temperature difference correction coefficient may be different.
  • the temperature difference between the water outlet temperature of the heat exchanger and the set temperature of the water outlet may be obtained first, and then the temperature difference is obtained.
  • the interval, and the correction value is obtained according to the interval in which the temperature difference is located, and the target frequency of the inverter compressor is generated according to the current frequency and the correction value of the inverter compressor.
  • the frequency control system of the compressor pre-stores the correspondence between the interval in which the temperature difference is located and the correction value of the compressor frequency, and the temperature difference is a result obtained by indicating the water temperature minus the set temperature of the water.
  • the correspondence table between the interval in which the temperature difference stored in advance is stored and the correction value is as shown in Table 1.
  • Table 1 is only an example of the correspondence between the interval in which the temperature difference is located and the correction value, and only the portion in which the temperature difference is located and the correction value are shown in Table 1.
  • the outlet temperature of the heat exchanger is calculated to be 14 ° C according to the tank thermometer, and the second temperature sensor obtains the outlet temperature of the heat exchanger. 15.6 ° C, the current frequency of the inverter compressor is 18 Hz, the difference between the water temperature and the set temperature of the effluent is calculated to be 1.6 ° C by calculation.
  • the temperature difference can be obtained by looking up Table 1 (1, 2).
  • the correction value corresponding to the temperature difference is -4 Hz.
  • the result obtained by adding the current frequency of the inverter compressor to the correction value is the target frequency of the inverter compressor, that is, the target frequency of the inverter compressor is 12 Hz.
  • the target frequency of the inverter compressor after the target frequency of the inverter compressor is generated according to the current frequency and the correction value of the inverter compressor, the target frequency of the inverter compressor can be further adjusted according to the operable frequency of the unit.
  • the target frequency of the inverter compressor can be compared with the operable frequency of the unit in the set of operating frequencies of the unit, and then the unit operating frequency closest to the target frequency can be obtained.
  • the operating frequency range of the unit is different under different tank temperatures. After obtaining the unit operating frequency that is closest to the target frequency, the maximum frequency and minimum frequency of the unit operation at the current tank temperature can be obtained first, and the unit can be operated with the frequency and the unit. The maximum operating frequency is compared with the maximum operating frequency of the unit. If the operating frequency of the unit is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the operating frequency of the unit is used as the target frequency; if the unit can operate at the frequency If the maximum operating frequency of the unit is greater than the maximum frequency of the unit operation, the maximum frequency of the unit operation is taken as the target frequency; if the unit operating frequency is less than the minimum frequency of the unit operation, the minimum frequency of the unit operation is taken as the target frequency.
  • the minimum operating frequency of the unit and the maximum operating frequency of the unit may be determined based on the outdoor ambient temperature T4 and the tank temperature T5.
  • the compressor operating frequency range is related to the outdoor ambient temperature T4 and the water tank temperature T5. Specifically, when the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold. When the outdoor temperature T4 is greater than the third preset temperature threshold, and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the compressor operates within the first preset frequency range, and is determined according to the first preset frequency range.
  • the minimum frequency of the unit operation and the maximum frequency of the unit operation when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range According to the second preset frequency range, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined.
  • the first preset temperature threshold is smaller than the third preset temperature threshold, and the first preset frequency range is narrower than the second preset frequency range.
  • the first preset temperature threshold is -5 ° C
  • the second preset temperature threshold is 50 ° C
  • the third preset temperature threshold is 30 ° C
  • the second preset temperature threshold is 50 ° C
  • the first preset temperature range It is 5 ° C - 20 ° C
  • the second preset temperature range is 20 ° C - 40 ° C.
  • the compressor operating frequency range is 42-60 Hz At this time, it can be determined that the minimum operating frequency of the unit is 42 Hz, and the maximum operating frequency of the unit is 60 Hz.
  • the operating frequency range of the compressor is 10-92 Hz. At this time, the minimum operating frequency of the unit can be determined to be 10 Hz.
  • the maximum operating frequency of the unit is 92Hz.
  • the frequency that the unit can operate includes four frequencies, the unit operating frequency F1 is 10 Hz, and the unit operating frequency F2 is 14 Hz.
  • the operating frequency F3 is 18 Hz, and the unit operating frequency F4 is 22 Hz. If the maximum operating frequency F max of the current tank temperature is 17 Hz, the minimum operating frequency F min of the unit at the current tank temperature is 11 Hz. After obtaining the target frequency Fs of the inverter compressor, it can be compared with the frequency at which the unit can operate.
  • the operating frequency of the unit closest to the target frequency Fs of the inverter compressor is the operating frequency F2 of the unit. Since the 14 Hz is between 11 Hz and 17 Hz, the operating frequency F2 of the unit can be used as the target frequency of the inverter compressor.
  • the inverter compressor operates at a frequency of 14 Hz.
  • the outlet temperature of the heat exchanger to control the frequency of the inverter compressor, the operating frequency of the compressor can be effectively reduced, the energy efficiency of the unit can be improved, and the minimum frequency of the unit operation can be limited when the water temperature is high. Guarantee the reliability of the compressor.
  • the frequency control method of the variable frequency heat pump water heater compressor firstly detecting the water outlet temperature of the heat exchanger and the water tank temperature of the water tank, and then generating the set water temperature of the heat exchanger according to the temperature of the water tank, and according to the heat exchange
  • the outlet temperature and the outlet set temperature of the device control the frequency of the inverter compressor.
  • This embodiment proposes a method of controlling the frequency of the compressor through the outlet temperature of the heat exchanger, which can be effective when the water temperature of the water tank is low. Reduce the operating frequency of the inverter compressor, improve the energy efficiency of the unit operation, and at the same time, under the condition of ensuring the constant outlet water temperature, effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
  • the present invention also proposes an evaluation system for the consumption of magnesium rods in an electric water heater.
  • FIG. 2 is a schematic structural view of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
  • the frequency control system of the variable frequency heat pump water heater comprises an inverter compressor 10, a heat exchanger 20 connected to the inverter compressor 10, and a first temperature sensor disposed at the water outlet of the heat exchanger 20. 30.
  • a water tank 40 connected to the heat exchanger 20, a second temperature sensor 50 disposed in the water tank 40, and a controller 60. among them:
  • the first temperature sensor 30 is for detecting the water outlet temperature of the heat exchanger 20; the second temperature sensor 50 is for detecting the water tank temperature of the water tank 40; and the controller 60 is for obtaining the water outlet temperature of the heat exchanger 20 from the first temperature sensor 30. And obtaining the water outlet temperature of the water tank 40 from the second temperature sensor 50, then generating the outlet water set temperature of the heat exchanger 20 according to the water tank temperature, and the inverter compressor 10 according to the outlet water temperature and the outlet water set temperature of the heat exchanger 20. The frequency is controlled.
  • the controller 60 can generate the water set temperature T1S by the following formula.
  • T5 is the tank temperature.
  • T1S a1*a2*a3*T5+b, where a1 is the water-water heat exchanger correction coefficient in the water tank, a2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
  • the water-water heat exchanger correction coefficient, the heat pump unit capacity correction coefficient, the correction parameter and the temperature difference correction coefficient in the water tank can be set according to actual use conditions, that is, under different use conditions,
  • the correction coefficient of the water-water heat exchanger in the above water tank, the correction coefficient of the heat pump unit capacity, the correction parameter and the temperature difference correction coefficient may be different.
  • the controller 60 may first obtain the temperature difference between the water outlet temperature of the heat exchanger 20 and the set water temperature, and then obtain the interval where the temperature difference is located. And obtaining a correction value according to the interval in which the temperature difference is located, and generating a target frequency of the inverter compressor 10 based on the current frequency and the correction value of the inverter compressor 10.
  • control system pre-stores the correspondence between the interval in which the temperature difference is located and the correction value of the compressor frequency, and the temperature difference is a result obtained by indicating the water temperature minus the set temperature of the water.
  • the correspondence table between the interval in which the temperature difference stored in advance is stored and the correction value is as shown in Table 1.
  • Table 1 is only an example of the correspondence between the interval in which the temperature difference is located and the correction value, and only the portion in which the temperature difference is located and the correction value are shown in Table 1.
  • the corresponding relationship between the temperature difference and the correction value of the inverter compressor frequency is as shown in Table 1, assuming that the tank temperature is based on The outlet set temperature of the heat exchanger 20 is calculated to be 14 ° C, the second temperature sensor 50 obtains the outlet temperature of the heat exchanger is 15.6 ° C, and the current frequency of the inverter compressor 10 is 18 Hz.
  • the water temperature and the effluent can be calculated by calculation.
  • the temperature difference of the set temperature is 1.6 °C.
  • the temperature difference can be obtained between (1, 2) by looking up Table 1.
  • the correction value corresponding to the temperature difference is -4 Hz, and the current frequency of the inverter compressor is corrected.
  • the result obtained after the value is the target frequency of the inverter compressor, that is, the target frequency of the inverter compressor is 12 Hz.
  • the controller 60 after the controller 60 generates the target frequency of the inverter compressor 10 according to the current frequency and the correction value of the inverter compressor 10, the controller 60 can also target the inverter compressor 10 according to the operable frequency of the unit. The frequency is further adjusted.
  • the controller 60 can compare the target frequency of the inverter compressor 10 with the unit operable frequency in the set of operating frequency of the unit, and then obtain the unit operable frequency that is closest to the target frequency.
  • the range of operating frequency of the unit is different under different tank temperatures.
  • the controller 60 can obtain the maximum frequency and minimum frequency of the unit operation at the current tank temperature, and then the unit can be operated. The frequency is compared with the maximum operating frequency of the unit and the maximum frequency of the unit operation. If the operating frequency of the unit is between the minimum frequency of the unit operation and the maximum frequency of the unit operation, the unit operating frequency is taken as the target frequency; if the unit can operate at a frequency greater than When the maximum operating frequency of the unit is running, the maximum frequency of the unit operation is taken as the target frequency; if the unit operating frequency is less than the minimum frequency of the unit operation, the minimum frequency of the unit operation is taken as the target frequency.
  • the controller 60 may determine the minimum operating frequency of the unit and the maximum operating frequency of the unit based on the outdoor ambient temperature T4 and the tank temperature T5.
  • the compressor operating frequency range is related to the outdoor ambient temperature T4 and the water tank temperature T5.
  • the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold
  • the water tank temperature T5 is greater than or equal to the second preset temperature threshold.
  • the compressor operates within the first preset frequency range, and is determined according to the first preset frequency range.
  • the minimum frequency of the unit operation and the maximum frequency of the unit operation when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range According to the second preset frequency range, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined.
  • the first preset temperature threshold is smaller than the third preset temperature threshold, and the first preset frequency range is narrower than the second preset frequency range.
  • the first preset temperature threshold is -5 ° C
  • the second preset temperature threshold is 50 ° C
  • the third preset temperature threshold is 30 ° C
  • the first preset temperature range is 5 ° C - 20 ° C
  • the second pre- Set the temperature range from 20 °C to 40 °C.
  • the controller 60 can determine that the minimum operating frequency of the unit is 42 Hz, and the maximum operating frequency of the unit is 60 Hz.
  • the compressor operating frequency ranges from 10 to 92 Hz. At this time, the controller 60 can determine the minimum operating frequency of the unit. At 10 Hz, the maximum operating frequency of the unit is 92 Hz.
  • the target frequency Fs of the inverter compressor 10 is 15 Hz according to the outlet water temperature and the outlet water set temperature, and the unit operable frequency includes four frequencies
  • the unit operable frequency F1 is 10 Hz
  • the unit operable frequency F2 is 14 Hz.
  • the unit's operating frequency F3 is 18Hz
  • the unit's operating frequency F4 is 22Hz.
  • the maximum operating frequency F max is 17 Hz at the current tank temperature
  • the minimum operating frequency F min of the unit at the current tank temperature is 11 Hz.
  • the unit operating frequency closest to the target frequency Fs of the compressor is the operating frequency F2 of the unit. Since 14 Hz is between 11 Hz and 17 Hz, the controller 60 can use the unit operating frequency F2 as the target of the inverter 10 Frequency, the inverter compressor 10 operates at a frequency of 14 Hz.
  • FIG. 3 The schematic diagram of the principle of the frequency control system of the variable frequency heat pump water heater compressor is shown in FIG. 3, and the heat exchanger 20 between the inverter compressor 10 and the throttle portion 70 in FIG. 3 can exchange water-refrigerant heat.
  • the water tank 40 includes a second temperature sensor 50 and a water tank internal water-water heat exchanger 90, and the water tank internal water-water heat exchanger 90 passes through the circulating water pump 80 and the water-refrigerant heat exchanger 21 connected.
  • the controller obtains the water outlet temperature of the heat exchanger from the first temperature sensor, and obtains the water tank temperature of the water tank from the second temperature sensor, and then according to the water tank
  • the set temperature of the effluent of the temperature generating heat exchanger, and the frequency of the variable frequency compressor are controlled according to the outlet temperature of the heat exchanger and the set temperature of the effluent.
  • This embodiment proposes a frequency conversion compression of the water passing through the heat exchanger.
  • the frequency of the machine is controlled.
  • the minimum operating frequency of the compressor can be effectively controlled to ensure compression under the condition that the outlet water temperature is constant. Machine reliability.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • a "computer-readable medium” can be any program that can contain, store, communicate, propagate, or transport.
  • computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
  • portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

A frequency control method for a variable frequency compressor of a heat pump hot water machine. The method comprises: detecting the outlet water temperature of a heat exchanger and the water tank temperature (T5) of a water tank (40); generating an outlet water set temperature (T1S) of the heat exchanger according to the water tank temperature (T5); and controlling the frequency of the variable frequency compressor (10) according to the outlet water temperature and the outlet water set temperature (T1S) of the heat exchanger. In addition, a frequency control system for the variable frequency compressor of the heat pump hot water machine is also related to.

Description

变频热泵热水机压缩机的频率控制方法及系统Frequency control method and system for variable frequency heat pump water heater compressor
相关申请的交叉引用Cross-reference to related applications
本申请要求于2015年05月22日提交中国专利局、申请号为201510268372.7、发明名称为“变频热泵热水机压缩机的频率控制方法及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese Patent Application filed on May 22, 2015, the Chinese Patent Office, Application No. 201510268372.7, and the invention entitled "Frequency Control Method and System for Variable Frequency Heat Pump Water Heater Compressor", the entire contents of which are The citations are incorporated herein by reference.
技术领域Technical field
本发明涉及热泵热水机技术领域，尤其涉及一种变频热泵热水机压缩机的频率控制方法及系统。The invention relates to the technical field of heat pump water heaters, in particular to a frequency control method and system for a frequency conversion heat pump water heater compressor.
背景技术Background technique
热泵热水机作为一种高效节能环保的设备，近年来在国内外获得了日益广泛的应用。随着变频技术的发展，变频热泵热水机已崭露头角。与定频热泵热水机相比，变频热泵热水机具有制热量大、能效高等优点，特别在低温环境温度下其优点更加明显。As a high-efficiency, energy-saving and environmentally friendly equipment, heat pump water heaters have been widely used at home and abroad in recent years. With the development of frequency conversion technology, variable frequency heat pump water heaters have emerged. Compared with the fixed-frequency heat pump water heater, the variable frequency heat pump water heater has the advantages of large heat generation and high energy efficiency, especially at low temperature and temperature.
目前，变频热泵热水机压缩机采用的频率控制方法是以水箱目标温度与水箱即时温度的差值作为反馈对象，即当两者温差大于某一值时，压缩机尽可能的以高频率运行以提高产热量，缩短加热时间；当两者温差小于某一值时，动态调整压缩机频率，为了保证水箱温度稳定在目标温度范围内，通常此时压缩机的运行频率比较低。At present, the frequency control method adopted by the variable frequency heat pump water heater compressor is based on the difference between the target temperature of the water tank and the instantaneous temperature of the water tank, that is, when the temperature difference between the two is greater than a certain value, the compressor runs at a high frequency as much as possible. In order to increase the heat production and shorten the heating time; when the temperature difference between the two is less than a certain value, the compressor frequency is dynamically adjusted. In order to ensure that the temperature of the water tank is stable within the target temperature range, the operating frequency of the compressor is usually low.
然而，通常变频热泵热水机所产生的热量随着缩机频率提高而增加，但其能效比呈抛物线变化趋势，即当压缩机频率高于某一频率时，热泵热水机的能效比随压缩机频率提高而下降，在低于这一频率时，热泵热水机的能效比随压缩机频率下降而下降。由此可见，现有的通过水箱内的温度对变频热泵热水机压缩机的频率进行控制的方式，变频热泵热水机的节能优势未能充分发挥，无法保证压缩机的可靠性。另外，压缩机的最大压力也是随频率上升而加大，然后再随频率上升而降低。However, the heat generated by the variable frequency heat pump water heater generally increases with the frequency of the reduction machine, but the energy efficiency ratio changes parabolically. That is, when the compressor frequency is higher than a certain frequency, the energy efficiency ratio of the heat pump water heater is The compressor frequency increases and decreases. Below this frequency, the energy efficiency ratio of the heat pump water heater decreases as the compressor frequency decreases. It can be seen that the existing energy-saving advantages of the frequency conversion heat pump water heater by the temperature in the water tank control the frequency of the frequency conversion heat pump water heater compressor, and the reliability of the compressor cannot be guaranteed. In addition, the maximum pressure of the compressor also increases as the frequency increases, and then decreases as the frequency increases.
发明内容Summary of the invention
本发明的目的旨在至少在一定程度上解决上述的技术问题之一。The object of the present invention is to solve at least one of the above technical problems to some extent.
为此，本发明的第一个目的在于提出一种变频热泵热水机压缩机的频率控制方法。该方法通过换热器的出水温度对压缩机的频率进行控制的方式，在水箱水温较低时可以有效降低变频压缩机的运行频率，提升机组运行能效，同时，在保证出水温度恒定情况下，有效控制压缩机的运行最低频率，保证压缩机的可靠性。 To this end, a first object of the present invention is to provide a frequency control method for a variable frequency heat pump water heater compressor. The method controls the frequency of the compressor through the water outlet temperature of the heat exchanger, and can effectively reduce the operating frequency of the inverter compressor when the water temperature of the water tank is low, and improve the energy efficiency of the operation of the unit, and at the same time, while ensuring a constant outlet water temperature, Effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
本发明的第二个目的在于提出一种变频热泵热水机压缩机的频率控制系统。A second object of the present invention is to provide a frequency control system for a variable frequency heat pump water heater compressor.
为了实现上述目的，本发明第一方面实施例的变频热泵热水机压缩机的频率控制方法，包括：检测换热器的出水温度和水箱的水箱温度；根据所述水箱温度生成所述换热器的出水设定温度；以及根据所述换热器的出水温度和出水设定温度对变频压缩机的频率进行控制。In order to achieve the above object, a frequency control method for a variable frequency heat pump water heater compressor according to an embodiment of the present invention includes: detecting a water outlet temperature of a heat exchanger and a water tank temperature of a water tank; and generating the heat exchange according to the water tank temperature. The effluent setting temperature of the device; and controlling the frequency of the inverter compressor according to the outlet temperature of the heat exchanger and the set temperature of the effluent.
根据本发明实施例的变频热泵热水机压缩机的频率控制方法，首先检测换热器的出水温度和水箱的水箱温度，然后根据水箱温度生成换热器的出水设定温度，以及根据换热器的出水温度和出水设定温度对变频压缩机的频率进行控制，该实施例提出了一种通过换热器的出水温度对压缩机的频率进行控制的方式，在水箱水温较低时可以有效降低变频压缩机的运行频率，提升机组运行能效，同时，在保证出水温度恒定情况下，有效控制压缩机的运行最低频率，保证压缩机的可靠性。According to the frequency control method of the variable frequency heat pump water heater compressor according to the embodiment of the present invention, firstly detecting the water outlet temperature of the heat exchanger and the water tank temperature of the water tank, and then generating the set water temperature of the heat exchanger according to the temperature of the water tank, and according to the heat exchange The outlet temperature and the outlet set temperature of the device control the frequency of the inverter compressor. This embodiment proposes a method of controlling the frequency of the compressor through the outlet temperature of the heat exchanger, which can be effective when the water temperature of the water tank is low. Reduce the operating frequency of the inverter compressor, improve the energy efficiency of the unit operation, and at the same time, under the condition of ensuring the constant outlet water temperature, effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
其中，在本发明的一个实施例中，通过以下公式生成所述出水设定温度，T1S＝f(T5)，T1S为出水设定温度，T5为水箱温度。In one embodiment of the present invention, the outlet set temperature is generated by the following formula, T1S=f(T5), T1S is the outlet set temperature, and T5 is the tank temperature.
其中，在本发明的一个实施例中，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。In one embodiment of the present invention, T1S=a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, a2 is a heat pump unit capacity correction coefficient, and a3 is another correction. Parameter, b is the temperature difference correction.
根据本发明的一个实施例，所述根据所述换热器的出水温度和所述换热器的出水设定温度对变频压缩机的频率进行控制具体包括：获取所述换热器的出水温度和出水设定温度之间的温度差；获取所述温度差所在的区间，并根据所述温度差所在的区间获取修正值；根据所述变频压缩机的当前频率和所述修正值生成所述变频压缩机的目标频率。According to an embodiment of the present invention, the controlling the frequency of the inverter compressor according to the water outlet temperature of the heat exchanger and the set water temperature of the heat exchanger comprises: obtaining the water outlet temperature of the heat exchanger And a temperature difference between the set temperature of the effluent; obtaining an interval in which the temperature difference is located, and obtaining a correction value according to the interval in which the temperature difference is located; generating the according to a current frequency of the inverter compressor and the correction value The target frequency of the inverter compressor.
根据本发明的一个实施例，所述控制方法还包括：将所述变频压缩机的目标频率与所述机组可运行频率集合中的机组可运行频率进行比较；获得与所述目标频率最相近的机组可运行频率，并将所述机组可运行频率作为所述目标频率。According to an embodiment of the invention, the control method further comprises: comparing a target frequency of the inverter compressor with a unit operable frequency of the set of operable frequencies of the unit; obtaining a closest to the target frequency The unit can operate at a frequency and use the unit operating frequency as the target frequency.
根据本发明的一个实施例，所述将所述机组可运行频率作为所述目标频率具体地包括：获取所述水箱温度下机组运行最小频率和机组运行最大频率；将所述机组可运行频率与所述组运行最小频率和所述机组运行最大频率；如果所述机组可运行频率位于所述机组运行最小频率与所述机组运行最大频率之间，则将所述机组可运行频率作为所述目标频率。According to an embodiment of the present invention, the operating frequency of the unit as the target frequency specifically includes: acquiring a minimum frequency of operation of the unit and a maximum frequency of operation of the unit at the temperature of the water tank; The group operating minimum frequency and the unit operating maximum frequency; if the unit operable frequency is between the unit operating minimum frequency and the unit operating maximum frequency, the unit operable frequency is used as the target frequency.
根据本发明的一个实施例，所述获取所述水箱温度下机组运行最小频率和机组运行最大频率，具体包括：根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率；当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据所述第一预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设温度阈值小于所述第三预设温度阈值；当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范围内，根据所述第二预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设频率范围比所述第二预设频率范围窄。According to an embodiment of the invention, the obtaining the minimum frequency of operation of the unit and the maximum frequency of operation of the unit at the temperature of the water tank comprises: determining a minimum frequency of operation of the unit and a maximum frequency of operation of the unit according to the outdoor environmental temperature T4 and the water tank temperature T5; When the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, the water tank temperature T5 is greater than or equal to the first When the temperature threshold is preset, the compressor operates in a first preset frequency range, and the minimum operating frequency of the unit and the maximum frequency of the unit operation are determined according to the first preset frequency range, wherein the first preset temperature threshold is less than The third preset temperature threshold; when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range, Determining a minimum operating frequency of the unit and a maximum operating frequency of the unit according to the second preset frequency range, wherein the A predetermined frequency range is narrower than the second predetermined frequency range.
根据本发明的一个实施例，所述控制方法还包括：如果所述机组可运行频率大于机组运 行最大频率，则将所述机组运行最大频率作为所述目标频率；如果所述机组可运行频率小于机组运行最小频率，则将所述机组运行最小频率作为所述目标频率。According to an embodiment of the invention, the control method further comprises: if the unit can operate at a frequency greater than the unit The maximum frequency of the line is used as the target frequency of the unit operating maximum frequency; if the unit operable frequency is less than the unit operating minimum frequency, the unit operating minimum frequency is taken as the target frequency.
为了实现上述目的，本发明第二方面实施例的电变频热泵热水机压缩机的频率控制系统，包括：变频压缩机；与所述变频压缩机相连的换热器；设置在所述换热器的出水口的第一温度传感器，用于检测所述换热器的出水温度；与所述换热器相连的水箱；设置在所述水箱中的第二温度传感器，用于检测所述水箱的水箱温度；控制器，用于从所述第一温度传感器中获得所述换热器的出水温度，并从所述第二温度传感器中获得所述水箱的出水温度，然后根据所述水箱温度生成所述换热器的出水设定温度，以及根据所述换热器的出水温度和出水设定温度对变频压缩机的频率进行控制。In order to achieve the above object, a frequency control system for an electric variable frequency heat pump water heater compressor according to a second aspect of the present invention includes: an inverter compressor; a heat exchanger connected to the inverter compressor; a first temperature sensor for detecting the outlet of the heat exchanger; a water tank connected to the heat exchanger; a second temperature sensor disposed in the water tank for detecting the water tank a water tank temperature controller for obtaining an outlet water temperature of the heat exchanger from the first temperature sensor, and obtaining an outlet water temperature of the water tank from the second temperature sensor, and then according to the water tank temperature The outlet set temperature of the heat exchanger is generated, and the frequency of the inverter compressor is controlled according to the outlet temperature of the heat exchanger and the set temperature of the outlet.
根据本发明实施例的变频热泵热水机压缩机的频率控制系统，控制器从第一温度传感器中获得换热器的出水温度，并从第二温度传感器中获得水箱的水箱温度，然后根据水箱温度生成换热器的出水设定温度，以及根据换热器的出水温度和出水设定温度对变频压缩机的频率进行控制，该实施例提出了一种通过换热器的出水温度对变频压缩机的频率进行控制的方式，在水箱水温较低时可以有效降低变频压缩机的运行频率，提升机组运行能效，同时，在保证出水温度恒定情况下，有效控制压缩机的运行最低频率，保证压缩机的可靠性。According to the frequency control system of the variable frequency heat pump water heater compressor according to the embodiment of the invention, the controller obtains the water outlet temperature of the heat exchanger from the first temperature sensor, and obtains the water tank temperature of the water tank from the second temperature sensor, and then according to the water tank The set temperature of the effluent of the temperature generating heat exchanger, and the frequency of the variable frequency compressor are controlled according to the outlet temperature of the heat exchanger and the set temperature of the effluent. This embodiment proposes a frequency conversion compression of the water passing through the heat exchanger. The frequency of the machine is controlled. When the water temperature of the water tank is low, the operating frequency of the inverter compressor can be effectively reduced, and the energy efficiency of the unit can be improved. At the same time, the minimum operating frequency of the compressor can be effectively controlled to ensure compression under the condition that the outlet water temperature is constant. Machine reliability.
其中，在本发明的一个实施例中，所述控制器通过以下公式生成所述出水设定温度，T1S＝f(T5)，T1S为出水设定温度，T5为水箱温度。In one embodiment of the present invention, the controller generates the outlet set temperature by the following formula, T1S=f(T5), T1S is the outlet set temperature, and T5 is the tank temperature.
其中，在本发明的一个实施例中，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。In one embodiment of the present invention, T1S=a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, a2 is a heat pump unit capacity correction coefficient, and a3 is another correction. Parameter, b is the temperature difference correction.
根据本发明的一个实施例，所述控制器，具体用于：获取所述换热器的出水温度和出水设定温度之间的温度差；获取所述温度差所在的区间，并根据所述温度差所在的区间获取修正值；根据所述变频压缩机的当前频率和所述修正值生成所述变频压缩机的目标频率。According to an embodiment of the present invention, the controller is specifically configured to: acquire a temperature difference between a water outlet temperature and a water set temperature of the heat exchanger; acquire an interval in which the temperature difference is located, and according to the The interval in which the temperature difference is located acquires a correction value; the target frequency of the inverter compressor is generated according to the current frequency of the inverter compressor and the correction value.
根据本发明的一个实施例，所述控制器，还用于：将所述变频压缩机的目标频率与所述机组可运行频率集合中的机组可运行频率进行比较；获得与所述目标频率最相近的机组可运行频率，并将所述机组可运行频率作为所述目标频率。According to an embodiment of the present invention, the controller is further configured to: compare a target frequency of the inverter compressor with a unit operable frequency in the set of operable frequencies of the unit; obtain the most A similar unit can operate at a frequency and use the unit operating frequency as the target frequency.
根据本发明的一个实施例，所述控制器，还用于：获取所述水箱温度下机组运行最小频率和机组运行最大频率；将所述机组可运行频率与所述组运行最小频率和所述机组运行最大频率；如果所述机组可运行频率位于所述机组运行最小频率与所述机组运行最大频率之间，则将所述机组可运行频率作为所述目标频率。According to an embodiment of the present invention, the controller is further configured to: acquire a minimum frequency of operation of the unit at the water tank temperature and a maximum frequency of operation of the unit; and operate the frequency of the unit and the minimum frequency of the group operation and The maximum operating frequency of the unit; if the operating frequency of the unit is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the operating frequency of the unit is taken as the target frequency.
根据本发明的一个实施例，所述控制器，还用于：根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率；当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据所述第一预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设温度阈值小于所述第三预设温度阈值；当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范 围内，根据所述第一预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设频率范围比所述第二预设频率范围窄。According to an embodiment of the present invention, the controller is further configured to: determine a minimum operating frequency of the unit and a maximum operating frequency of the unit according to the outdoor ambient temperature T4 and the water tank temperature T5; when the outdoor ambient temperature T4 is less than or equal to the first preset The temperature threshold, when the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the compressor operates at the first Determining, according to the first preset frequency range, a unit operating minimum frequency and a unit operating maximum frequency, wherein the first preset temperature threshold is less than the third preset temperature threshold; and the outdoor environment The temperature T4 is between the first preset temperature range, and when the water tank temperature T5 is between the second preset temperature range, the compressor operates at the second preset frequency range And determining, according to the first preset frequency range, a unit operating minimum frequency and a unit operating maximum frequency, wherein the first preset frequency range is narrower than the second preset frequency range.
根据本发明的一个实施例，所述控制器，还用于：如果所述机组可运行频率大于机组运行最大频率，则将所述机组运行最大频率作为所述目标频率；如果所述机组可运行频率小于机组运行最小频率，则将所述机组运行最小频率作为所述目标频率。According to an embodiment of the present invention, the controller is further configured to: if the unit operable frequency is greater than a unit operating maximum frequency, use the unit operating maximum frequency as the target frequency; if the unit is operable If the frequency is less than the minimum frequency of operation of the unit, the minimum frequency of operation of the unit is taken as the target frequency.
本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。The additional aspects and advantages of the invention will be set forth in part in the description which follows.
附图说明DRAWINGS
本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中，The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from
图1是根据本发明一个实施例的变频热泵热水机压缩机的频率控制方法的流程图。1 is a flow chart of a frequency control method of a variable frequency heat pump water heater compressor in accordance with one embodiment of the present invention.
图2是根据本发明一个实施例的变频热泵热水机压缩机的频率控制系统的结构示意图。2 is a schematic structural view of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
图3是根据本发明一个实施例的变频热泵热水机压缩机的频率控制系统的原理示例图。3 is a diagram showing an example of the principle of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
附图标记：Reference mark:
变频压缩机10、换热器20、第一温度传感器30、水箱40、第二温度传感器50、控制器60、节流部分70、循环水泵80、水箱内部水-水换热器90、水-冷媒换热器21。Inverter compressor 10, heat exchanger 20, first temperature sensor 30, water tank 40, second temperature sensor 50, controller 60, throttling portion 70, circulating water pump 80, water tank internal water-water heat exchanger 90, water - Refrigerant heat exchanger 21.
具体实施方式detailed description
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.
下面参考附图描述本发明实施例的变频热泵热水机压缩机的频率控制方法及系统。A frequency control method and system for a variable frequency heat pump water heater compressor according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
图1是根据本发明一个实施例的变频热泵热水机压缩机的频率控制方法的流程图。1 is a flow chart of a frequency control method of a variable frequency heat pump water heater compressor in accordance with one embodiment of the present invention.
如图1所示，该变频热泵热水机压缩机的频率控制方法可以包括：As shown in FIG. 1, the frequency control method of the variable frequency heat pump water heater compressor may include:
S101，检测换热器的出水温度和水箱的水箱温度。S101, detecting a water outlet temperature of the heat exchanger and a water tank temperature of the water tank.
具体地，在变频热泵热水机工作的过程中，设置在换热器的出水口的第一温度传感器可以检测出换热器的出水温度，设置在水箱中的第二温度传感器可以检测水箱的水箱温度。Specifically, during the operation of the variable frequency heat pump water heater, the first temperature sensor disposed at the water outlet of the heat exchanger can detect the water outlet temperature of the heat exchanger, and the second temperature sensor disposed in the water tank can detect the water tank. Water tank temperature.
S102，根据水箱温度生成换热器的出水设定温度。S102. Generate a set temperature of the water outlet of the heat exchanger according to the temperature of the water tank.
在获得水箱的水箱温度后，可通过以下公式生成出换热器的水设定温度T1S，After obtaining the water tank temperature of the water tank, the water set temperature T1S of the heat exchanger can be generated by the following formula.
T1S＝f(T5)T1S=f(T5)
其中，T5为水箱温度。Among them, T5 is the tank temperature.
例如，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。 For example, T1S=a1*a2*a3*T5+b, where a1 is the water-water heat exchanger correction coefficient in the water tank, a2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
需要说明的是，上述水箱内水-水换热器修正系数、热泵机组能力修正系数、修正参数和温差修正系数可根据实际的使用情况进行设定，也就是说，在不同的使用情况下，上述水箱内水-水换热器修正系数、热泵机组能力修正系数、修正参数和温差修正系数的取值可能不同。It should be noted that the water-water heat exchanger correction coefficient, the heat pump unit capacity correction coefficient, the correction parameter and the temperature difference correction coefficient in the water tank can be set according to actual use conditions, that is, under different use conditions, The correction coefficient of the water-water heat exchanger in the above water tank, the correction coefficient of the heat pump unit capacity, the correction parameter and the temperature difference correction coefficient may be different.
S103，根据换热器的出水温度和出水设定温度对变频压缩机的频率进行控制。S103, controlling the frequency of the inverter compressor according to the outlet temperature of the heat exchanger and the set temperature of the outlet water.
在本发明的一个实施例中，在根据水箱温度生成换热器的出水设定温度后，可先获取换热器的出水温度和出水设定温度之间的温度差，然后获取温度差所在的区间，并根据温度差所在的区间获取修正值，以及根据变频压缩机的当前频率和修正值生成变频压缩机的目标频率。In an embodiment of the present invention, after the set temperature of the outlet of the heat exchanger is generated according to the temperature of the water tank, the temperature difference between the water outlet temperature of the heat exchanger and the set temperature of the water outlet may be obtained first, and then the temperature difference is obtained. The interval, and the correction value is obtained according to the interval in which the temperature difference is located, and the target frequency of the inverter compressor is generated according to the current frequency and the correction value of the inverter compressor.
其中，压缩机的频率控制系统预先保存温度差所在的区间与压缩机频率的修正值的对应关系，上述温度差是指出水温度减去出水设定温度所获得的结果。Wherein, the frequency control system of the compressor pre-stores the correspondence between the interval in which the temperature difference is located and the correction value of the compressor frequency, and the temperature difference is a result obtained by indicating the water temperature minus the set temperature of the water.
例如，预先保存的温度差所在的区间与修正值的对应关系表，如表1所示。For example, the correspondence table between the interval in which the temperature difference stored in advance is stored and the correction value is as shown in Table 1.
表1 温度差所在的区间与修正值的对应关系表Table 1 Correspondence table between the interval where the temperature difference is located and the correction value
温度差的区间(单位为℃)Temperature difference interval (in °C) 修正值(单位为Hz)Correction value (in Hz)
(2,3](2,3) -8Hz-8Hz
(1,2](1,2) -4Hz-4Hz
[-1,1][-1,1] 0Hz0Hz
(-1,-2](-1,-2] 4Hz4Hz
(-2,-3](-2,-3] 8Hz8Hz
需要说明的是，表1仅是仅是温度差所在的区间与修正值之间的对应关系的一种示例，表1中仅示出了温度差所在的区间与修正值的一部分对应关系。It should be noted that Table 1 is only an example of the correspondence between the interval in which the temperature difference is located and the correction value, and only the portion in which the temperature difference is located and the correction value are shown in Table 1.
例如，假定温度差与压缩机频率的修正值的对应关系如表1所示，假定根据水箱温度计算出换热器的出水设定温度为14℃，第二温度传感器获得换热器的出水温度为15.6℃，变频压缩机的当前频率为18Hz，通过计算可以算出出水温度与出水设定温度的温度差值为1.6℃，通过查表1可以获得该温度差位于(1,2]之间，该温度差对应的修正值为-4Hz，将变频压缩机的当前频率加上修正值后所获得的结果即为变频压缩机的目标频率，即变频压缩机的目标频率12Hz。For example, suppose the correspondence between the temperature difference and the correction value of the compressor frequency is as shown in Table 1. It is assumed that the outlet temperature of the heat exchanger is calculated to be 14 ° C according to the tank thermometer, and the second temperature sensor obtains the outlet temperature of the heat exchanger. 15.6 ° C, the current frequency of the inverter compressor is 18 Hz, the difference between the water temperature and the set temperature of the effluent is calculated to be 1.6 ° C by calculation. The temperature difference can be obtained by looking up Table 1 (1, 2). The correction value corresponding to the temperature difference is -4 Hz. The result obtained by adding the current frequency of the inverter compressor to the correction value is the target frequency of the inverter compressor, that is, the target frequency of the inverter compressor is 12 Hz.
另外，在该实施例中，在根据变频压缩机的当前频率和修正值生成变频压缩机的目标频率后，还可以根据机组可运行频率对变频压缩机的目标频率进行进一步调整。In addition, in this embodiment, after the target frequency of the inverter compressor is generated according to the current frequency and the correction value of the inverter compressor, the target frequency of the inverter compressor can be further adjusted according to the operable frequency of the unit.
具体地，可将变频压缩机的目标频率与机组可运行频率集合中的机组可运行频率进行比较，然后获得与目标频率最相近的机组可运行频率。Specifically, the target frequency of the inverter compressor can be compared with the operable frequency of the unit in the set of operating frequencies of the unit, and then the unit operating frequency closest to the target frequency can be obtained.
通常不同水箱温度下机组运行频率的范围不同，在获得与目标频率最相近的机组可运行频率后，可先获得当前水箱温度下机组运行最大频率和最小频率，并将该机组可运行频率与机组运行最大频率和机组运行最大频率进行比较，如果该机组可运行频率位于机组运行最小频率与机组运行最大频率之间，则将机组可运行频率作为目标频率；如果该机组可运行频率 大于机组运行最大频率，则将机组运行最大频率作为目标频率；如果机组可运行频率小于机组运行最小频率，则将机组运行最小频率作为目标频率。Generally, the operating frequency range of the unit is different under different tank temperatures. After obtaining the unit operating frequency that is closest to the target frequency, the maximum frequency and minimum frequency of the unit operation at the current tank temperature can be obtained first, and the unit can be operated with the frequency and the unit. The maximum operating frequency is compared with the maximum operating frequency of the unit. If the operating frequency of the unit is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the operating frequency of the unit is used as the target frequency; if the unit can operate at the frequency If the maximum operating frequency of the unit is greater than the maximum frequency of the unit operation, the maximum frequency of the unit operation is taken as the target frequency; if the unit operating frequency is less than the minimum frequency of the unit operation, the minimum frequency of the unit operation is taken as the target frequency.
在本发明的一个实施例中，可根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率。具体地，压缩机运行频率范围与室外环境温度T4和水箱温度T5有关，具体而言，当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据第一预设频率范围确定机组运行最小频率和机组运行最大频率；当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范围内，根据第二预设频率范围确定机组运行最小频率和机组运行最大频率。In one embodiment of the present invention, the minimum operating frequency of the unit and the maximum operating frequency of the unit may be determined based on the outdoor ambient temperature T4 and the tank temperature T5. Specifically, the compressor operating frequency range is related to the outdoor ambient temperature T4 and the water tank temperature T5. Specifically, when the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold. When the outdoor temperature T4 is greater than the third preset temperature threshold, and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the compressor operates within the first preset frequency range, and is determined according to the first preset frequency range. The minimum frequency of the unit operation and the maximum frequency of the unit operation; when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range According to the second preset frequency range, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined.
其中，需要说明的是，上述第一预设温度阈值小于上述第三预设温度阈值，上述第一预设频率范围比上述第二预设频率范围窄。It should be noted that the first preset temperature threshold is smaller than the third preset temperature threshold, and the first preset frequency range is narrower than the second preset frequency range.
例如，假定第一预设温度阈值为-5℃，第二预设温度阈值为50℃，第三预设温度阈值为30℃，第二预设温度阈值为50℃，第一预设温度范围为5℃-20℃，第二预设温度范围20℃-40℃。当室外环境温度T4小于或者等于-5℃，水箱温度T5大于等于50℃时，或者当室外环境温度T4大于30℃，水箱温度T5大于或者等于50℃时，压缩机运行频率范围为42-60Hz，此时，可确定机组最小运行频率为42Hz，机组最大运行频率为60Hz。当室外环境温度T4位于5℃至20℃之间，且水箱温度T5位于20℃至40℃之间时，缩机运行频率范围为10-92Hz，此时，可确定机组最小运行频率为10Hz，机组最大运行频率为92Hz。例如，假定根据出水温度和出水设定温度计算得到变频压缩机的目标频率Fs为15Hz，机组可运行的频率包括四种频率，机组可运行频率F1为10Hz，机组可运行频率F2为14Hz，机组可运行频率F3为18Hz，机组可运行频率F4为22Hz。若当前水箱温度下机组运行最大频率Fmax为17Hz，当前水箱温度下机组运行最小频率Fmin为11Hz，在获得变频压缩机的目标频率Fs后，通过与机组可运行的频率进行比较，可以看出，与变频压缩机的目标频率Fs最接近的机组可运行频率为机组可运行频率F2，由于14Hz位于11Hz与17Hz之间，因此，可将机组可运行频率F2作为变频压缩机的目标频率，变频压缩机以14Hz的频率运行。For example, assume that the first preset temperature threshold is -5 ° C, the second preset temperature threshold is 50 ° C, the third preset temperature threshold is 30 ° C, and the second preset temperature threshold is 50 ° C, the first preset temperature range It is 5 ° C - 20 ° C, and the second preset temperature range is 20 ° C - 40 ° C. When the outdoor ambient temperature T4 is less than or equal to -5 ° C, the water tank temperature T5 is greater than or equal to 50 ° C, or when the outdoor ambient temperature T4 is greater than 30 ° C, the water tank temperature T5 is greater than or equal to 50 ° C, the compressor operating frequency range is 42-60 Hz At this time, it can be determined that the minimum operating frequency of the unit is 42 Hz, and the maximum operating frequency of the unit is 60 Hz. When the outdoor ambient temperature T4 is between 5 °C and 20 °C, and the water tank temperature T5 is between 20 °C and 40 °C, the operating frequency range of the compressor is 10-92 Hz. At this time, the minimum operating frequency of the unit can be determined to be 10 Hz. The maximum operating frequency of the unit is 92Hz. For example, suppose that the target frequency Fs of the inverter compressor is 15 Hz according to the outlet water temperature and the set temperature of the effluent, the frequency that the unit can operate includes four frequencies, the unit operating frequency F1 is 10 Hz, and the unit operating frequency F2 is 14 Hz. The operating frequency F3 is 18 Hz, and the unit operating frequency F4 is 22 Hz. If the maximum operating frequency F max of the current tank temperature is 17 Hz, the minimum operating frequency F min of the unit at the current tank temperature is 11 Hz. After obtaining the target frequency Fs of the inverter compressor, it can be compared with the frequency at which the unit can operate. The operating frequency of the unit closest to the target frequency Fs of the inverter compressor is the operating frequency F2 of the unit. Since the 14 Hz is between 11 Hz and 17 Hz, the operating frequency F2 of the unit can be used as the target frequency of the inverter compressor. The inverter compressor operates at a frequency of 14 Hz.
综上可以看出，通过采用换热器的出水温度来控制变频压缩机的频率，可以有效的降低压缩机的运行频率，提升机组运行能效，在水温较高的时候限定机组运行的最低频率，保证压缩机的可靠性。In summary, it can be seen that by using the outlet temperature of the heat exchanger to control the frequency of the inverter compressor, the operating frequency of the compressor can be effectively reduced, the energy efficiency of the unit can be improved, and the minimum frequency of the unit operation can be limited when the water temperature is high. Guarantee the reliability of the compressor.
根据本发明实施例的变频热泵热水机压缩机的频率控制方法，首先检测换热器的出水温度和水箱的水箱温度，然后根据水箱温度生成换热器的出水设定温度，以及根据换热器的出水温度和出水设定温度对变频压缩机的频率进行控制，该实施例提出了一种通过换热器的出水温度对压缩机的频率进行控制的方式，在水箱水温较低时可以有效降低变频压缩机的运行频率，提升机组运行能效，同时，在保证出水温度恒定情况下，有效控制压缩机的运行最低频率，保证压缩机的可靠性。 According to the frequency control method of the variable frequency heat pump water heater compressor according to the embodiment of the present invention, firstly detecting the water outlet temperature of the heat exchanger and the water tank temperature of the water tank, and then generating the set water temperature of the heat exchanger according to the temperature of the water tank, and according to the heat exchange The outlet temperature and the outlet set temperature of the device control the frequency of the inverter compressor. This embodiment proposes a method of controlling the frequency of the compressor through the outlet temperature of the heat exchanger, which can be effective when the water temperature of the water tank is low. Reduce the operating frequency of the inverter compressor, improve the energy efficiency of the unit operation, and at the same time, under the condition of ensuring the constant outlet water temperature, effectively control the minimum operating frequency of the compressor to ensure the reliability of the compressor.
为了实现上述实施例，本发明还提出了一种电热水器中镁棒的消耗情况评估系统。In order to achieve the above embodiment, the present invention also proposes an evaluation system for the consumption of magnesium rods in an electric water heater.
图2是根据本发明一个实施例的变频热泵热水机压缩机的频率控制系统的结构示意图。2 is a schematic structural view of a frequency control system of a variable frequency heat pump water heater compressor according to an embodiment of the present invention.
如图2所示，该变频热泵热水机压缩机的频率控制系统包括变频压缩机10、与变频压缩机10相连的换热器20、设置在换热器20的出水口的第一温度传感器30、与换热器20相连的水箱40、设置在水箱40中的第二温度传感器50和控制器60。其中：As shown in FIG. 2, the frequency control system of the variable frequency heat pump water heater comprises an inverter compressor 10, a heat exchanger 20 connected to the inverter compressor 10, and a first temperature sensor disposed at the water outlet of the heat exchanger 20. 30. A water tank 40 connected to the heat exchanger 20, a second temperature sensor 50 disposed in the water tank 40, and a controller 60. among them:
第一温度传感器30用于检测换热器20的出水温度；第二温度传感器50用于检测水箱40的水箱温度；控制器60用于从第一温度传感器30中获得换热器20的出水温度，并从第二温度传感器50中获得水箱40的出水温度，然后根据水箱温度生成换热器20的出水设定温度，以及根据换热器20的出水温度和出水设定温度对变频压缩机10的频率进行控制。The first temperature sensor 30 is for detecting the water outlet temperature of the heat exchanger 20; the second temperature sensor 50 is for detecting the water tank temperature of the water tank 40; and the controller 60 is for obtaining the water outlet temperature of the heat exchanger 20 from the first temperature sensor 30. And obtaining the water outlet temperature of the water tank 40 from the second temperature sensor 50, then generating the outlet water set temperature of the heat exchanger 20 according to the water tank temperature, and the inverter compressor 10 according to the outlet water temperature and the outlet water set temperature of the heat exchanger 20. The frequency is controlled.
其中，控制器60可通过以下公式生成出水设定温度T1S，The controller 60 can generate the water set temperature T1S by the following formula.
T1S＝f(T5)T1S=f(T5)
其中，T5为水箱温度。Among them, T5 is the tank temperature.
例如，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。For example, T1S=a1*a2*a3*T5+b, where a1 is the water-water heat exchanger correction coefficient in the water tank, a2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
需要说明的是，上述水箱内水-水换热器修正系数、热泵机组能力修正系数、修正参数和温差修正系数可根据实际的使用情况进行设定，也就是说，在不同的使用情况下，上述水箱内水-水换热器修正系数、热泵机组能力修正系数、修正参数和温差修正系数的取值可能不同。It should be noted that the water-water heat exchanger correction coefficient, the heat pump unit capacity correction coefficient, the correction parameter and the temperature difference correction coefficient in the water tank can be set according to actual use conditions, that is, under different use conditions, The correction coefficient of the water-water heat exchanger in the above water tank, the correction coefficient of the heat pump unit capacity, the correction parameter and the temperature difference correction coefficient may be different.
控制器60在根据水箱温度生成换热器20的出水设定温度后，控制器60可先获取换热器20的出水温度和出水设定温度之间的温度差，然后获取温度差所在的区间，并根据温度差所在的区间获取修正值，以及根据变频压缩机10的当前频率和修正值生成变频压缩机10的目标频率。After the controller 60 generates the set water temperature of the heat exchanger 20 according to the water tank temperature, the controller 60 may first obtain the temperature difference between the water outlet temperature of the heat exchanger 20 and the set water temperature, and then obtain the interval where the temperature difference is located. And obtaining a correction value according to the interval in which the temperature difference is located, and generating a target frequency of the inverter compressor 10 based on the current frequency and the correction value of the inverter compressor 10.
其中，控制系统预先保存温度差所在的区间与压缩机频率的修正值的对应关系，上述温度差是指出水温度减去出水设定温度所获得的结果。Wherein, the control system pre-stores the correspondence between the interval in which the temperature difference is located and the correction value of the compressor frequency, and the temperature difference is a result obtained by indicating the water temperature minus the set temperature of the water.
例如，预先保存的温度差所在的区间与修正值的对应关系表，如表1所示。For example, the correspondence table between the interval in which the temperature difference stored in advance is stored and the correction value is as shown in Table 1.
表1 温度差所在的区间与修正值的对应关系表Table 1 Correspondence table between the interval where the temperature difference is located and the correction value
温度差的区间(单位为℃)Temperature difference interval (in °C) 修正值(单位为Hz)Correction value (in Hz)
(2,3](2,3) -8Hz-8Hz
(1,2](1,2) -4Hz-4Hz
[-1,1][-1,1] 0Hz0Hz
(-1,-2](-1,-2] 4Hz4Hz
(-2,-3](-2,-3] 8Hz8Hz
需要说明的是，表1仅是仅是温度差所在的区间与修正值之间的对应关系的一种示例，表1中仅示出了温度差所在的区间与修正值的一部分对应关系。It should be noted that Table 1 is only an example of the correspondence between the interval in which the temperature difference is located and the correction value, and only the portion in which the temperature difference is located and the correction value are shown in Table 1.
例如，假定温度差与变频压缩机频率的修正值的对应关系如表1所示，假定根据水箱温 度计算出换热器20的出水设定温度为14℃，第二温度传感器50获得换热器的出水温度为15.6℃，变频压缩机10的当前频率为18Hz，通过计算可以算出出水温度与出水设定温度的温度差值为1.6℃，通过查表1可以获得该温度差位于(1,2]之间，该温度差对应的修正值为-4Hz，将变频压缩机的当前频率加上修正值后所获得的结果即为变频压缩机的目标频率，即变频压缩机的目标频率为12Hz。For example, assume that the corresponding relationship between the temperature difference and the correction value of the inverter compressor frequency is as shown in Table 1, assuming that the tank temperature is based on The outlet set temperature of the heat exchanger 20 is calculated to be 14 ° C, the second temperature sensor 50 obtains the outlet temperature of the heat exchanger is 15.6 ° C, and the current frequency of the inverter compressor 10 is 18 Hz. The water temperature and the effluent can be calculated by calculation. The temperature difference of the set temperature is 1.6 °C. The temperature difference can be obtained between (1, 2) by looking up Table 1. The correction value corresponding to the temperature difference is -4 Hz, and the current frequency of the inverter compressor is corrected. The result obtained after the value is the target frequency of the inverter compressor, that is, the target frequency of the inverter compressor is 12 Hz.
另外，在该实施例中，控制器60在根据变频压缩机10的当前频率和修正值生成变频压缩机10的目标频率后，控制器60还可以根据机组可运行频率对变频压缩机10的目标频率进行进一步调整。In addition, in this embodiment, after the controller 60 generates the target frequency of the inverter compressor 10 according to the current frequency and the correction value of the inverter compressor 10, the controller 60 can also target the inverter compressor 10 according to the operable frequency of the unit. The frequency is further adjusted.
具体地，控制器60可将变频压缩机10的目标频率与机组可运行频率集合中的机组可运行频率进行比较，然后获得与目标频率最相近的机组可运行频率。Specifically, the controller 60 can compare the target frequency of the inverter compressor 10 with the unit operable frequency in the set of operating frequency of the unit, and then obtain the unit operable frequency that is closest to the target frequency.
通常不同水箱温度下机组运行频率的范围不同，控制器60在获得与目标频率最相近的机组可运行频率后，可先获得当前水箱温度下机组运行最大频率和最小频率，然后将该机组可运行频率与机组运行最大频率和机组运行最大频率进行比较，如果该机组可运行频率位于机组运行最小频率与机组运行最大频率之间，则将机组可运行频率作为目标频率；如果该机组可运行频率大于机组运行最大频率，则将机组运行最大频率作为目标频率；如果机组可运行频率小于机组运行最小频率，则将机组运行最小频率作为目标频率。Generally, the range of operating frequency of the unit is different under different tank temperatures. After obtaining the unit operating frequency that is closest to the target frequency, the controller 60 can obtain the maximum frequency and minimum frequency of the unit operation at the current tank temperature, and then the unit can be operated. The frequency is compared with the maximum operating frequency of the unit and the maximum frequency of the unit operation. If the operating frequency of the unit is between the minimum frequency of the unit operation and the maximum frequency of the unit operation, the unit operating frequency is taken as the target frequency; if the unit can operate at a frequency greater than When the maximum operating frequency of the unit is running, the maximum frequency of the unit operation is taken as the target frequency; if the unit operating frequency is less than the minimum frequency of the unit operation, the minimum frequency of the unit operation is taken as the target frequency.
在本发明的一个实施例中，控制器60可根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率。具体地，压缩机运行频率范围与室外环境温度T4和水箱温度T5有关，具体而言，当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据第一预设频率范围确定机组运行最小频率和机组运行最大频率；当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范围内，根据第二预设频率范围确定机组运行最小频率和机组运行最大频率。In one embodiment of the present invention, the controller 60 may determine the minimum operating frequency of the unit and the maximum operating frequency of the unit based on the outdoor ambient temperature T4 and the tank temperature T5. Specifically, the compressor operating frequency range is related to the outdoor ambient temperature T4 and the water tank temperature T5. Specifically, when the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold. When the outdoor temperature T4 is greater than the third preset temperature threshold, and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the compressor operates within the first preset frequency range, and is determined according to the first preset frequency range. The minimum frequency of the unit operation and the maximum frequency of the unit operation; when the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range According to the second preset frequency range, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined.
其中，需要说明的是，上述第一预设温度阈值小于上述第三预设温度阈值，上述第一预设频率范围比上述第二预设频率范围窄。It should be noted that the first preset temperature threshold is smaller than the third preset temperature threshold, and the first preset frequency range is narrower than the second preset frequency range.
例如，假定第一预设温度阈值为-5℃，第二预设温度阈值为50℃，第三预设温度阈值为30℃，第一预设温度范围为5℃-20℃，第二预设温度范围20℃-40℃。当室外环境温度T4小于或者等于-5℃，水箱温度T5大于等于50℃时，或者当室外环境温度T4大于30℃，水箱温度T5大于或者等于50℃时，压缩机运行频率范围为42-60Hz，此时，控制器60可确定机组最小运行频率为42Hz，机组最大运行频率为60Hz。当室外环境温度T4位于5℃至20℃之间，且水箱温度T5位于20℃至40℃之间时，缩机运行频率范围为10-92Hz，此时，控制器60可确定机组最小运行频率为10Hz，机组最大运行频率为92Hz。For example, assume that the first preset temperature threshold is -5 ° C, the second preset temperature threshold is 50 ° C, the third preset temperature threshold is 30 ° C, and the first preset temperature range is 5 ° C - 20 ° C, the second pre- Set the temperature range from 20 °C to 40 °C. When the outdoor ambient temperature T4 is less than or equal to -5 ° C, the water tank temperature T5 is greater than or equal to 50 ° C, or when the outdoor ambient temperature T4 is greater than 30 ° C, the water tank temperature T5 is greater than or equal to 50 ° C, the compressor operating frequency range is 42-60 Hz At this time, the controller 60 can determine that the minimum operating frequency of the unit is 42 Hz, and the maximum operating frequency of the unit is 60 Hz. When the outdoor ambient temperature T4 is between 5 ° C and 20 ° C, and the water tank temperature T5 is between 20 ° C and 40 ° C, the compressor operating frequency ranges from 10 to 92 Hz. At this time, the controller 60 can determine the minimum operating frequency of the unit. At 10 Hz, the maximum operating frequency of the unit is 92 Hz.
例如，假定根据出水温度和出水设定温度计算得到变频压缩机10的目标频率Fs为15Hz，机组可运行的频率包括四种频率，机组可运行频率F1为10Hz，机组可运行频率F2为14Hz，机组可运行频率F3为18Hz，机组可运行频率F4为22Hz。若当前水箱温度下机组运行最大 频率Fmax为17Hz，当前水箱温度下机组运行最小频率Fmin为11Hz，在获得压缩机的目标频率Fs后，通过与机组可运行的频率进行比较，可以看出，与压缩机的目标频率Fs最接近的机组可运行频率为机组可运行频率F2，由于14Hz位于11Hz与17Hz之间，因此，控制器60可将机组可运行频率F2作为变频压缩机10的目标频率，变频压缩机10以14Hz的频率运行。For example, suppose that the target frequency Fs of the inverter compressor 10 is 15 Hz according to the outlet water temperature and the outlet water set temperature, and the unit operable frequency includes four frequencies, the unit operable frequency F1 is 10 Hz, and the unit operable frequency F2 is 14 Hz. The unit's operating frequency F3 is 18Hz, and the unit's operating frequency F4 is 22Hz. If the maximum operating frequency F max is 17 Hz at the current tank temperature, the minimum operating frequency F min of the unit at the current tank temperature is 11 Hz. After obtaining the target frequency Fs of the compressor, it can be seen by comparing with the frequency at which the unit can operate. The unit operating frequency closest to the target frequency Fs of the compressor is the operating frequency F2 of the unit. Since 14 Hz is between 11 Hz and 17 Hz, the controller 60 can use the unit operating frequency F2 as the target of the inverter 10 Frequency, the inverter compressor 10 operates at a frequency of 14 Hz.
其中，该变频热泵热水机压缩机的频率控制系统的原理示例图，如图3所示，图3中变频压缩机10与节流部分70之间的换热器20可以水-冷媒换热器或者空气-冷媒换热器，水箱40中包括第二温度传感器50和水箱内部水-水换热器90，且水箱内部水-水换热器90通过循环水泵80与水-冷媒换热器21相连。The schematic diagram of the principle of the frequency control system of the variable frequency heat pump water heater compressor is shown in FIG. 3, and the heat exchanger 20 between the inverter compressor 10 and the throttle portion 70 in FIG. 3 can exchange water-refrigerant heat. Or air-refrigerant heat exchanger, the water tank 40 includes a second temperature sensor 50 and a water tank internal water-water heat exchanger 90, and the water tank internal water-water heat exchanger 90 passes through the circulating water pump 80 and the water-refrigerant heat exchanger 21 connected.
根据本发明实施例的变频热泵热水机压缩机的频率控制系统，控制器从第一温度传感器中获得换热器的出水温度，并从第二温度传感器中获得水箱的水箱温度，然后根据水箱温度生成换热器的出水设定温度，以及根据换热器的出水温度和出水设定温度对变频压缩机的频率进行控制，该实施例提出了一种通过换热器的出水温度对变频压缩机的频率进行控制的方式，在水箱水温较低时可以有效降低变频压缩机的运行频率，提升机组运行能效，同时，在保证出水温度恒定情况下，有效控制压缩机的运行最低频率，保证压缩机的可靠性。According to the frequency control system of the variable frequency heat pump water heater compressor according to the embodiment of the invention, the controller obtains the water outlet temperature of the heat exchanger from the first temperature sensor, and obtains the water tank temperature of the water tank from the second temperature sensor, and then according to the water tank The set temperature of the effluent of the temperature generating heat exchanger, and the frequency of the variable frequency compressor are controlled according to the outlet temperature of the heat exchanger and the set temperature of the effluent. This embodiment proposes a frequency conversion compression of the water passing through the heat exchanger. The frequency of the machine is controlled. When the water temperature of the water tank is low, the operating frequency of the inverter compressor can be effectively reduced, and the energy efficiency of the unit can be improved. At the same time, the minimum operating frequency of the compressor can be effectively controlled to ensure compression under the condition that the outlet water temperature is constant. Machine reliability.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本发明的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本发明的实施例所属技术领域的技术人员所理解。Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain.
在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的定序列表，可以具体实现在任何计算机可读介质中，以供指令执行系统、装置或设备(如基于计算机的系统、包括处理器的系统或其他可以从指令执行系统、装置或设备取指令并执行指令的系统)使用，或结合这些指令执行系统、装置或设备而使用。就本说明书而言，"计算机可读介质"可以是任何可以包含、存储、通信、传播或传输程序以 供指令执行系统、装置或设备或结合这些指令执行系统、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电连接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。The logic and/or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer readable medium, Used in conjunction with, or in conjunction with, an instruction execution system, apparatus, or device (eg, a computer-based system, a system including a processor, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Or use with equipment. For the purposes of this specification, a "computer-readable medium" can be any program that can contain, store, communicate, propagate, or transport. A device for use in an instruction execution system, apparatus, or device, or in conjunction with such an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
应当理解，本发明的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.
此外，在本发明各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
上述提到的存储介质可以是只读存储器，磁盘或光盘等。尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。 The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like. Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (16)

  1. 一种变频热泵热水机压缩机的频率控制方法，其特征在于，包括以下步骤：A frequency control method for a variable frequency heat pump water heater compressor, characterized in that the method comprises the following steps:
    检测换热器的出水温度和水箱的水箱温度；Detecting the outlet temperature of the heat exchanger and the tank temperature of the water tank;
    根据所述水箱温度生成所述换热器的出水设定温度；以及Generating a set temperature of the outlet of the heat exchanger according to the temperature of the water tank;
    根据所述换热器的出水温度和出水设定温度对变频压缩机的频率进行控制。The frequency of the inverter compressor is controlled according to the outlet temperature of the heat exchanger and the set temperature of the outlet water.
  2. 如权利要求1所述的变频热泵热水机压缩机的频率控制方法，其特征在于，通过以下公式生成所述出水设定温度，A frequency control method for a variable frequency heat pump water heater compressor according to claim 1, wherein said outlet water set temperature is generated by the following formula,
    T1S＝f(T5)，T1S为出水设定温度，T5为水箱温度。T1S=f(T5), T1S is the set temperature of the effluent, and T5 is the tank temperature.
  3. 如权利要求2所述的变频热泵热水机压缩机的频率控制方法，其特征在于，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。A frequency control method for a variable frequency heat pump water heater compressor according to claim 2, wherein T1S=a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, A2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
  4. 如权利要求1所述的变频热泵热水机压缩机的频率控制方法，其特征在于，所述根据所述换热器的出水温度和所述换热器的出水设定温度对变频压缩机的频率进行控制具体包括：A frequency control method for a variable frequency heat pump water heater compressor according to claim 1, wherein said variable temperature compressor is based on an outlet temperature of said heat exchanger and a set temperature of said heat exchanger Frequency control includes:
    获取所述换热器的出水温度和出水设定温度之间的温度差；Obtaining a temperature difference between a water outlet temperature and a water set temperature of the heat exchanger;
    获取所述温度差所在的区间，并根据所述温度差所在的区间获取修正值；Obtaining an interval in which the temperature difference is located, and obtaining a correction value according to the interval in which the temperature difference is located;
    根据所述变频压缩机的当前频率和所述修正值生成所述变频压缩机的目标频率。A target frequency of the inverter compressor is generated based on a current frequency of the inverter compressor and the correction value.
  5. 如权利要求4所述的变频热泵热水机压缩机的频率控制方法，其特征在于，还包括：The frequency control method of the variable frequency heat pump water heater compressor according to claim 4, further comprising:
    将所述变频压缩机的目标频率与所述机组可运行频率集合中的机组可运行频率进行比较；Comparing a target frequency of the inverter compressor with a unit operable frequency in the set of operable frequencies of the unit;
    获得与所述目标频率最相近的机组可运行频率，并将所述机组可运行频率作为所述目标频率。Obtaining a unit operable frequency that is closest to the target frequency, and using the unit operable frequency as the target frequency.
  6. 如权利要求5所述的变频热泵热水机压缩机的频率控制方法，其特征在于，所述将所述机组可运行频率作为所述目标频率具体地包括：The frequency control method of the variable frequency heat pump water heater compressor according to claim 5, wherein the operating frequency of the unit as the target frequency specifically includes:
    获取所述水箱温度下机组运行最小频率和机组运行最大频率；Obtaining the minimum frequency of operation of the unit and the maximum frequency of operation of the unit at the temperature of the water tank;
    将所述机组可运行频率与所述组运行最小频率和所述机组运行最大频率进行比较；Comparing the operational frequency of the unit with the minimum frequency of operation of the group and the maximum frequency of operation of the unit;
    如果所述机组可运行频率位于所述机组运行最小频率与所述机组运行最大频率之间，则将所述机组可运行频率作为所述目标频率。If the unit operating frequency is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the unit operable frequency is taken as the target frequency.
  7. 如权利要求6所述的变频热泵热水机压缩机的频率控制方法，其特征在于，所述获取所述水箱温度下机组运行最小频率和机组运行最大频率，具体包括：The frequency control method of the variable frequency heat pump water heater compressor according to claim 6, wherein the obtaining the minimum operating frequency of the unit and the maximum operating frequency of the unit at the temperature of the water tank comprises:
    根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率；According to the outdoor ambient temperature T4 and the water tank temperature T5, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined;
    当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据所述第一预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设温度阈值小于所述第三预设 温度阈值；When the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, the water tank temperature T5 is greater than or equal to the first When the temperature threshold is preset, the compressor operates in a first preset frequency range, and the minimum operating frequency of the unit and the maximum frequency of the unit operation are determined according to the first preset frequency range, wherein the first preset temperature threshold is less than The third preset Temperature threshold
    当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范围内，根据所述第二预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设频率范围比所述第二预设频率范围窄。When the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range, according to the second preset frequency range Determining a minimum operating frequency of the unit and a maximum operating frequency of the unit, wherein the first predetermined frequency range is narrower than the second predetermined frequency range.
  8. 如权利要求6所述的变频热泵热水机压缩机的频率控制方法，其特征在于，还包括：The frequency control method of the variable frequency heat pump water heater compressor according to claim 6, further comprising:
    如果所述机组可运行频率大于所述机组运行最大频率，则将所述机组运行最大频率作为所述目标频率；If the operating frequency of the unit is greater than the maximum operating frequency of the unit, the maximum operating frequency of the unit is taken as the target frequency;
    如果所述机组可运行频率小于所述机组运行最小频率，则将所述机组运行最小频率作为所述目标频率。If the unit operable frequency is less than the unit operating minimum frequency, the unit operating minimum frequency is taken as the target frequency.
  9. 一种变频热泵热水机压缩机的频率控制系统，其特征在于，包括：A frequency control system for a variable frequency heat pump water heater compressor, characterized in that it comprises:
    变频压缩机；Inverter compressor
    与所述变频压缩机相连的换热器；a heat exchanger connected to the inverter compressor;
    设置在所述换热器的出水口的第一温度传感器，用于检测所述换热器的出水温度；a first temperature sensor disposed at a water outlet of the heat exchanger for detecting a water outlet temperature of the heat exchanger;
    与所述换热器相连的水箱；a water tank connected to the heat exchanger;
    设置在所述水箱中的第二温度传感器，用于检测所述水箱的水箱温度；a second temperature sensor disposed in the water tank for detecting a water tank temperature of the water tank;
    控制器，用于从所述第一温度传感器中获得所述换热器的出水温度，并从所述第二温度传感器中获得所述水箱的出水温度，然后根据所述水箱温度生成所述换热器的出水设定温度，以及根据所述换热器的出水温度和出水设定温度对变频压缩机的频率进行控制。a controller for obtaining an outlet water temperature of the heat exchanger from the first temperature sensor, and obtaining an outlet water temperature of the water tank from the second temperature sensor, and then generating the replacement according to the water tank temperature The outlet of the heater sets the temperature, and controls the frequency of the inverter compressor according to the outlet temperature of the heat exchanger and the set temperature of the outlet.
  10. 如权利要求9所述的变频热泵热水机压缩机的频率控制系统，其特征在于，所述控制器通过以下公式生成所述出水设定温度，A frequency control system for a variable frequency heat pump water heater compressor according to claim 9, wherein said controller generates said outlet water set temperature by the following formula,
    T1S＝f(T5)，T1S为出水设定温度，T5为水箱温度。T1S=f(T5), T1S is the set temperature of the effluent, and T5 is the tank temperature.
  11. 如权利要求10所述的变频热泵热水机压缩机的频率控制系统，其特征在于，T1S＝a1*a2*a3*T5+b，其中，a1为水箱内水-水换热器修正系数，a2为热泵机组能力修正系数，a3为其他修正参数，b为温差修正。A frequency control system for a variable frequency heat pump water heater compressor according to claim 10, wherein T1S=a1*a2*a3*T5+b, wherein a1 is a water-water heat exchanger correction coefficient in the water tank, A2 is the heat pump unit capacity correction coefficient, a3 is the other correction parameter, and b is the temperature difference correction.
  12. 如权利要求9所述的变频热泵热水机压缩机的频率控制系统，其特征在于，所述控制器，具体用于：The frequency control system of the variable frequency heat pump water heater compressor according to claim 9, wherein the controller is specifically configured to:
    获取所述换热器的出水温度和出水设定温度之间的温度差；Obtaining a temperature difference between a water outlet temperature and a water set temperature of the heat exchanger;
    获取所述温度差所在的区间，并根据所述温度差所在的区间获取修正值；Obtaining an interval in which the temperature difference is located, and obtaining a correction value according to the interval in which the temperature difference is located;
    根据所述变频压缩机的当前频率和所述修正值生成所述变频压缩机的目标频率。A target frequency of the inverter compressor is generated based on a current frequency of the inverter compressor and the correction value.
  13. 如权利要求12所述的变频热泵热水机压缩机的频率控制系统，其特征在于，所述控制器，还用于：The frequency control system of the variable frequency heat pump water heater compressor according to claim 12, wherein the controller is further configured to:
    将所述变频压缩机的目标频率与所述机组可运行频率集合中的机组可运行频率进行比较；Comparing a target frequency of the inverter compressor with a unit operable frequency in the set of operable frequencies of the unit;
    获得与所述目标频率最相近的机组可运行频率，并将所述机组可运行频率作为所述目标频率。Obtaining a unit operable frequency that is closest to the target frequency, and using the unit operable frequency as the target frequency.
  14. 如权利要求13所述的变频热泵热水机压缩机的频率控制系统，其特征在于，所述 控制器，还用于：A frequency control system for a variable frequency heat pump water heater compressor according to claim 13, wherein said Controller, also used to:
    获取所述水箱温度下机组运行最小频率和机组运行最大频率；Obtaining the minimum frequency of operation of the unit and the maximum frequency of operation of the unit at the temperature of the water tank;
    将所述机组可运行频率与所述组运行最小频率和所述机组运行最大频率进行比较；Comparing the operational frequency of the unit with the minimum frequency of operation of the group and the maximum frequency of operation of the unit;
    如果所述机组可运行频率位于所述机组运行最小频率与所述机组运行最大频率之间，则将所述机组可运行频率作为所述目标频率。If the unit operating frequency is between the minimum operating frequency of the unit and the maximum operating frequency of the unit, the unit operable frequency is taken as the target frequency.
  15. 如权利要求14所述的变频热泵热水机压缩机的频率控制方法，其特征在于，所述控制器，还用于：The frequency control method of the variable frequency heat pump water heater compressor according to claim 14, wherein the controller is further configured to:
    根据室外环境温度T4和水箱温度T5来确定机组运行最小频率和机组运行最大频率；According to the outdoor ambient temperature T4 and the water tank temperature T5, the minimum frequency of the unit operation and the maximum frequency of the unit operation are determined;
    当室外环境温度T4小于或者等于第一预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，或者当室外环境温度T4大于第三预设温度阈值，水箱温度T5大于或者等于第二预设温度阈值时，压缩机运行在第一预设频率范围内，根据所述第一预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设温度阈值小于所述第三预设温度阈值；When the outdoor ambient temperature T4 is less than or equal to the first preset temperature threshold, the water tank temperature T5 is greater than or equal to the second preset temperature threshold, or when the outdoor ambient temperature T4 is greater than the third preset temperature threshold, the water tank temperature T5 is greater than or equal to the first When the temperature threshold is preset, the compressor operates in a first preset frequency range, and the minimum operating frequency of the unit and the maximum frequency of the unit operation are determined according to the first preset frequency range, wherein the first preset temperature threshold is less than The third preset temperature threshold;
    当室外环境温度T4处于第一预设温度范围之间，水箱温度T5处于第二预设温度范围之间时，压缩机运行在第二预设频率范围内，根据所述第二预设频率范围确定机组运行最小频率和机组运行最大频率，其中，所述第一预设频率范围比所述第二预设频率范围窄。When the outdoor ambient temperature T4 is between the first preset temperature range and the water tank temperature T5 is between the second preset temperature range, the compressor operates within the second preset frequency range, according to the second preset frequency range Determining a minimum operating frequency of the unit and a maximum operating frequency of the unit, wherein the first predetermined frequency range is narrower than the second predetermined frequency range.
  16. 如权利要求14所述的变频热泵热水机压缩机的频率控制系统，其特征在于，所述控制器，还用于：The frequency control system of the variable frequency heat pump water heater compressor according to claim 14, wherein the controller is further configured to:
    如果所述机组可运行频率大于所述机组运行最大频率，则将所述机组运行最大频率作为所述目标频率；If the operating frequency of the unit is greater than the maximum operating frequency of the unit, the maximum operating frequency of the unit is taken as the target frequency;
    如果所述机组可运行频率小于所述机组运行最小频率，则将所述机组运行最小频率作为所述目标频率。 If the unit operable frequency is less than the unit operating minimum frequency, the unit operating minimum frequency is taken as the target frequency.
PCT/CN2015/084252 2015-05-22 2015-07-16 Frequency control method and system for variable frequency compressor of heat pump hot water machine WO2016187939A1 (en)

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