CN104819547A - Method and system for fluorine lacking detection and protection during startup of variable frequency air-conditioning system - Google Patents
Method and system for fluorine lacking detection and protection during startup of variable frequency air-conditioning system Download PDFInfo
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- CN104819547A CN104819547A CN201510250634.7A CN201510250634A CN104819547A CN 104819547 A CN104819547 A CN 104819547A CN 201510250634 A CN201510250634 A CN 201510250634A CN 104819547 A CN104819547 A CN 104819547A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a method and system for fluorine lacking detection and protection during the startup of a variable frequency air-conditioning system. According to the method and system for fluorine lacking detection and protection during the startup of the variable frequency air-conditioning system, through sensing bulbs arranged at the positions of an inlet of an evaporator, an outlet of the evaporator, an indoor unit and an outdoor unit and a pressure sensor arranged on the outdoor unit, the evaporator inlet temperature, the evaporator outlet temperature, the indoor temperature, the outdoor environment temperature and outdoor condensing pressure are detected respectively, and calculation and assessment are performed according to the detection result. When preset conditions are met, the fluorine lacking determination is performed step by step; when it is determined that a compressor is in a fluorine lacking state, the running of the compressor and an outer fan is stopped timely, so that after the variable frequency air-conditioning system is placed for a long term or transported for a long distance, whether the fluorine lacking occurs is detected during the startup and the protection is performed, and the problem that the low refrigerating efficiency and compressor abrasion intensification or burndown of the compressor occur when the compressor runs in a fluorine lacking state is solved.
Description
Technical field
The application relates to refrigeration technology field, and more particularly, scarce fluorine when relating to the start of a kind of frequency-conversion air-conditioning system detects and guard method and system.
Background technology
Air-conditioning system generally has specified refrigerant injection rate, and within the scope of certain injection rate, system can normally work, if intrasystem coolant quantity is very few not only seriously can reduce refrigeration, more can increase the weight of compressor abrasion, even can cause burning of compressor.But, air-conditioning system through to place for a long time or after long-distance transportation, refrigerant likely has certain leakage, if at this moment directly start run; might because coolant quantity could not be up to standard and cause that the refrigeration of frequency-conversion air-conditioning system reduces, compressor abrasion aggravates or burns.Too low by pressure of inspiration(Pi) for fixed frequency air conditioner, or pressure at expulsion is crossed high mode and is carried out scarce fluorine detection, and frequency-conversion air-conditioning system changes due to compressor frequency, pressure of inspiration(Pi) and pressure at expulsion scope larger, cannot by carrying out scarce fluorine judgement to the detection of pressure of inspiration(Pi) or pressure at expulsion.
Summary of the invention
In view of this; scarce fluorine when the application provides a kind of frequency-conversion air-conditioning system to start shooting detects and guard method and system; for protecting compressor when frequency-conversion air-conditioning system is started shooting after placement or long-distance transportation for a long time, to avoid causing refrigeration reduction, compressor abrasion aggravation because of scarce fluorine or burning.
To achieve these goals, the existing scheme proposed is as follows:
Scarce fluorine during frequency-conversion air-conditioning system start detects and a guard method, and described frequency-conversion air-conditioning system comprises compressor, condenser, electric expansion valve, evaporimeter and outer blower fan and pressure sensor, comprising:
After described frequency-conversion air-conditioning system start, when described compressor operating is to original frequency, detect each parameter of described frequency-conversion air-conditioning system, if saturation temperature corresponding to the condensing pressure that detects of described pressure sensor is less than or equal to outdoor environment temperature, then carry out scarce fluorine protection operation; Otherwise, if the evaporator outlet temperature of described evaporimeter is greater than the difference of indoor temperature and the first preset temperature, and the difference between the evaporator temperature of described evaporator outlet temperature and described evaporimeter is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure, then carry out scarce fluorine and judge in advance; Otherwise keep normal to run;
Described scarce fluorine judges to comprise in advance: the current running frequency keeping described compressor, the aperture of described electric expansion valve is turned down first preset aperture and continue the second preset duration, if current described evaporator temperature is less than or equal to the difference of the described evaporator temperature before turning down and the 3rd preset temperature, then carry out scarce fluorine judgement; Otherwise the aperture of described electric expansion valve is opened from default initial opening preset aperture to described second greatly further, if now current described evaporator temperature is more than or equal to the evaporator temperature before action and described 3rd preset temperature sum, then carry out scarce fluorine judgement, otherwise the aperture of described electric expansion valve is adjusted to default initial opening, and keeps described compressor and described outer blower fan normally to run;
Described scarce fluorine judges to comprise: the aperture of described electric expansion valve is remained on described second and preset aperture, control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency, and run the 3rd preset duration, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, or, the difference of described evaporator outlet temperature and described evaporator temperature is greater than the 4th preset temperature, and described evaporator outlet temperature is greater than the difference of indoor temperature and described first preset temperature, and described outer machine pressure is less than or equal to preset pressure, then judge that described compressor is in scarce fluorine state, carry out scarce fluorine protection operation, otherwise, described compressor and described blower fan is kept normally to run,
Described scarce fluorine protection comprises: close described compressor and described outer blower fan.
Optionally, described first preset temperature is 1 ~ 3 degree Celsius, and described second preset temperature is 10 ~ 18 degrees Celsius, and described 3rd preset temperature is 1 ~ 3 degree Celsius, and described 4th preset temperature is 15 ~ 20 degrees Celsius;
Described preset pressure is 1600 ~ 3300 kPas, and the described first default step-length is 150 ~ 300 steps, and the described second default step-length is 300 ~ 500 steps, and described default initial opening is 150 ~ 300 steps;
Described second preset duration is 1 ~ 3 minute, and described 3rd preset duration is 1 ~ 4 minute, and described predeterminated frequency is 50 ~ 90 hertz.
Optionally, also comprise:
After carrying out described scarce fluorine protection at every turn, record and show the fault-signal representing and lack fluorine state, and record trouble number of times, after the 4th preset duration of pausing, the aperture of shown electric expansion valve is adjusted to described default initial opening, restarts described compressor and described outer blower fan;
Prescribe a time limit when the described number of stoppages is more than or equal on preset failure number of times, described compressor and described outer blower fan are remained on stopped status.
Optionally, described 4th preset duration is 1 ~ 6 minute, and the described preset failure number of times upper limit is 3 times.
Optionally, when the variable frequency range of described compressor is 10 ~ 100 hertz:
Described first preset temperature is 3 degrees Celsius, and described second preset temperature is 16 degrees Celsius, and described 3rd preset temperature is 2 degrees Celsius, and described 4th preset temperature is 20 degrees Celsius;
Described first default aperture is 80 steps, and the described second default aperture is 500 steps, and described default initial opening is 150 steps;
Described preset pressure is 3200 kPas, and described second preset duration is 2 minutes, and described 3rd preset duration is 2 minutes, and described 4th preset duration is 5 minutes, and described predeterminated frequency is 80 hertz.
Scarce fluorine during frequency-conversion air-conditioning system start detects and a protection system, and described frequency-conversion air-conditioning system comprises compressor, condenser, electric expansion valve, evaporimeter, outer blower fan and pressure sensor, comprising:
Open state detection module, for after described frequency-conversion air-conditioning system start, when described compressor operating is to original frequency, respectively evaporator temperature, evaporator outlet temperature, indoor temperature, outdoor environment temperature and outdoor condensing pressure are detected, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, then carry out scarce fluorine protection operation; Otherwise, if the evaporator outlet temperature of described evaporimeter is greater than the difference of indoor temperature and the first preset temperature, and the difference between the evaporator temperature of described evaporator outlet temperature and described evaporimeter is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure, then carry out scarce fluorine and judge in advance; Otherwise keep normal to run;
Lack the pre-determination module of fluorine, for keeping the current running frequency of described compressor according to described evaporator temperature detection signal, the aperture of described electric expansion valve is turned down first preset aperture and continue the second preset duration, if current described evaporator temperature is less than or equal to the difference of the described evaporator temperature before turning down and the 3rd preset temperature, then exports and lack fluorine decision signal; Otherwise the aperture of described electric expansion valve is opened from default initial opening preset aperture to described second greatly further, if now current described evaporator temperature is more than or equal to the evaporator temperature before action and described 3rd preset temperature sum, then export described scarce fluorine decision signal, otherwise the aperture of described electric expansion valve is adjusted to default initial opening, and keeps described compressor and described outer blower fan normally to run;
Lack fluorine determination module, aperture is preset with the aperture of described electric expansion valve being remained on described second according to described scarce fluorine decision signal, control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency, and run the 3rd preset duration, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, or, the difference of described evaporator outlet temperature and described evaporator temperature is greater than the 4th preset temperature, and described evaporator outlet temperature is greater than the difference of indoor temperature and described first preset temperature, and outer machine pressure is less than or equal to preset pressure, then judge that described compressor is in scarce fluorine state, export and lack fluorine guard signal, otherwise, described compressor and described blower fan is kept normally to run,
Lack fluorine protection module, for closing described compressor and described outer blower fan according to described scarce fluorine guard signal.
Optionally, described first preset temperature is 1 ~ 3 degree Celsius, and described second preset temperature is 10 ~ 18 degrees Celsius, and described 3rd preset temperature is 1 ~ 3 degree Celsius, and described 4th preset temperature is 15 ~ 20 degrees Celsius;
Described preset pressure is 1600 ~ 3300 kPas, and the described first default step-length is 150 ~ 300 steps, and the described second default step-length is 300 ~ 500 steps, and described default initial opening is 150 ~ 300 steps;
Described second preset duration is 1 ~ 3 minute, and described 3rd preset duration is 1 ~ 4 minute, and described predeterminated frequency is 50 ~ 90 hertz.
Optionally, also comprise:
Protection determination module, for after carrying out described scarce fluorine protection at every turn, record and show the fault-signal representing and lack fluorine state, and record trouble number of times, after the 4th preset duration of pausing, the aperture of shown electric expansion valve is adjusted to described default initial opening, restarts described compressor and described outer blower fan;
Prescribe a time limit when the described number of stoppages is more than or equal on preset failure number of times, described compressor and described outer blower fan are remained on stopped status.
Optionally, described 4th preset duration is 1 ~ 6 minute, and the described preset failure number of times upper limit is 3 times.
Optionally, when the variable frequency range of described compressor is 10 ~ 100 hertz:
Described first preset temperature is 3 degrees Celsius, and described second preset temperature is 16 degrees Celsius, and described 3rd preset temperature is 2 degrees Celsius, and described 4th preset temperature is 20 degrees Celsius;
Described first default aperture is 80 steps, and the described second default aperture is 500 steps, and described default initial opening is 150 steps;
Described preset pressure is 3200 kPas, and described second preset duration is 2 minutes, and described 3rd preset duration is 2 minutes, and described 4th preset duration is 5 minutes, and described predeterminated frequency is 80 hertz.
As can be seen from technique scheme; scarce fluorine when this application provides the start of a kind of frequency-conversion air-conditioning system detects and guard method and system; this scarce fluorine detect and guard method and system when starting shooting by being arranged on the temperature-sensitive bag at the import of evaporimeter, the outlet of evaporimeter, indoor set and off-premises station place; and the pressure sensor be arranged on outer machine; respectively evaporator temperature, evaporator outlet temperature, indoor temperature, outdoor environment temperature and outdoor condensing pressure are detected, and carry out calculating and assessing according to testing result.Scarce fluorine judgement is progressively carried out when meeting pre-conditioned; when judging that compressor stops the operation of compressor and outer blower fan in time when being in scarce fluorine state; thus enable frequency-conversion air-conditioning system whether occur scarce fluorine through to place for a long time or detect when starting shooting after long-distance transportation and protect, and then avoid compressor to run under scarce fluorine state occurring that refrigerating efficiency is low, compressor abrasion aggravates or burns.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 1 provides for the embodiment of the present application and the flow chart of guard method;
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 2 provides for another embodiment of the application and the flow chart of guard method;
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 3 provides for the another embodiment of the application and the schematic diagram of protection system;
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 4 provides for the another embodiment of the application and the schematic diagram of protection system.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 1 provides for the embodiment of the present application and the flow chart of guard method.
The frequency-conversion air-conditioning system that the present embodiment provides comprises compressor, condenser, and condensation fan, electric expansion valve, evaporimeter and outer blower fan, also comprise gas-liquid separator, oil eliminator, the parts such as reservoir, above-mentioned each parts are in turn connected into coolant circulating system by pipeline, in the import of evaporimeter, the outlet of evaporimeter, indoor set and off-premises station are provided with temperature-sensitive bag, for to evaporator temperature, evaporator outlet temperature, indoor temperature and outdoor environment temperature detect, in system high pressure side, namely off-premises station is furnished with pressure sensor, detect for external machine pressure.Certainly in order to ensure the normal operation of whole frequency-conversion air-conditioning system, the temperature-sensitive bag at oil temperature temperature-sensitive bag and some other position bottom compressor air-discharging temperature-sensitive bag, compressor is also comprised, and the low-pressure lateral pressure sensor of layout and system low-voltage side.
As shown in Figure 1, the scarce fluorine that the present embodiment provides detects and guard method comprises following operation:
S101: the open state of frequency-conversion air-conditioning system is detected.
Respectively the outer machine pressure of the evaporator temperature of evaporimeter and evaporator outlet temperature, off-premises station and indoor temperature are detected, if the scarce fluorine that carries out first meeting following condition judges in advance, otherwise keep frequency-conversion air-conditioning system normally to run, do not do other operations.
1) saturation temperature that condensing pressure is corresponding is less than or equal to outdoor environment temperature;
2) evaporator temperature is greater than the difference of indoor temperature and the first preset temperature, and the difference of evaporator outlet temperature and evaporator temperature is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure.
In each condition above-mentioned, the second default aperture is 300 ~ 500 steps, and the first preset temperature is 1 ~ 3 degree Celsius, and the second preset temperature is 10 ~ 18 degrees Celsius, and preset pressure is 1600 ~ 3300 kPas, and default initial opening is 150 ~ 300 steps.
S102: scarce fluorine judges in advance.
The running frequency keeping compressor current is constant, the electronic expansion valve opening of electric expansion valve is turned down first preset aperture and keep the second preset duration, if current evaporator temperature is less than or equal to the difference of the evaporator temperature before turning down and the 3rd preset temperature, then carry out scarce fluorine decision; Otherwise, further the aperture of electric expansion valve is opened from default initial opening and preset aperture to second greatly, if now current evaporator temperature is more than or equal to the evaporator temperature before action and the 3rd preset temperature sum, then carry out scarce fluorine decision equally, otherwise the aperture of electric expansion valve is adjusted to default initial opening, and keep the current operating conditions of frequency-conversion air-conditioning system, namely keep compressor and outer blower fan normally to run.
In this step, the first default aperture is 50 ~ 150 steps, and the second preset duration is 1 ~ 3 minute, and the 3rd preset temperature is 1 ~ 3 degree Celsius, and default initial opening is 150 ~ 300 steps.
S103: lack fluorine and judge.
Electronic expansion valve opening is kept or adjusts to second presetting aperture, and control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency from default original frequency, after being adjusted to predeterminated frequency, keep the 3rd preset duration.If the saturation temperature that the condensing pressure that pressure sensor detects is corresponding is less than or equal to outdoor environment temperature; or the difference of evaporator outlet temperature and evaporator temperature is greater than the 4th preset temperature and evaporator outlet temperature is greater than the difference of indoor temperature and the first preset temperature and outer machine pressure is less than or equal to preset pressure; then judge that this compressor is in scarce fluorine state; carry out scarce fluorine protection operation; otherwise judge that this compressor fluorine amount is normal, now keep compressor and described blower fan normally to run.
Predeterminated frequency is 50 ~ 90 hertz, and the 3rd preset duration is 1 ~ 4 minute, the 4th preset temperature 15 ~ 20 degrees Celsius.
S104: lack fluorine protection.
When determining compressor in scarce fluorine determination step for lacking fluorine state, compressor and exogenous wind office are closed, corresponding display unit shows corresponding fault cues, and send chimes of doom, note to point out the user of this frequency-conversion air-conditioning system, enable to obtain corresponding warning message in advance, to operate accordingly or to dispose, and then avoid compressor lack fluorine operation for a long time and cause refrigerating efficiency lowly even to burn out compressor.
As can be seen from technique scheme; scarce fluorine when present embodiments providing the start of a kind of frequency-conversion air-conditioning system detects and guard method; this scarce fluorine detect and guard method when starting shooting by being arranged on the temperature-sensitive bag at the import of evaporimeter, the outlet of evaporimeter, indoor set and off-premises station place; and the pressure sensor be arranged on outer machine; respectively evaporator temperature, evaporator outlet temperature, indoor temperature, outdoor environment temperature and outdoor condensing pressure are detected, and carry out calculating and assessing according to testing result.Scarce fluorine judgement is progressively carried out when meeting pre-conditioned; when judging that compressor stops the operation of compressor and outer blower fan in time when being in scarce fluorine state; thus enable frequency-conversion air-conditioning system whether occur scarce fluorine through to place for a long time or detect when starting shooting after long-distance transportation and protect, and then avoid compressor to run under scarce fluorine state occurring that refrigerating efficiency is low, compressor abrasion aggravates or burns.
Embodiment two
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 2 provides for another embodiment of the application and the flow chart of guard method.
As shown in Figure 2, the scarce fluorine that the present embodiment provides detects and guard method comprises the steps:
S201: the open state of frequency-conversion air-conditioning system is detected.
Respectively the outer machine pressure of the evaporator temperature of evaporimeter and evaporator outlet temperature, off-premises station and indoor temperature are detected, if the scarce fluorine that carries out first meeting following condition judges in advance, otherwise keep frequency-conversion air-conditioning system normally to run, do not do other operations.
1) saturation temperature that condensing pressure is corresponding is less than or equal to outdoor environment temperature;
2) evaporator temperature is greater than the difference of indoor temperature and the first preset temperature, and the difference of evaporator outlet temperature and evaporator temperature is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure.
In each condition above-mentioned, the second default aperture is 300 ~ 500 steps, and the first preset temperature is 1 ~ 3 degree Celsius, and the second preset temperature is 10 ~ 18 degrees Celsius, and preset pressure is 1600 ~ 3300 kPas.
S202: scarce fluorine judges in advance.
The running frequency keeping compressor current is constant, the electronic expansion valve opening of electric expansion valve is turned down first preset aperture and keep the second preset duration, if current evaporator temperature is less than or equal to the difference of the evaporator temperature before turning down and the 3rd preset temperature, then carry out scarce fluorine decision; Otherwise, further the aperture of electric expansion valve is opened from default initial opening and preset aperture to second greatly, if now current evaporator temperature is more than or equal to the evaporator temperature before action and the 3rd preset temperature sum, then carry out scarce fluorine decision equally, otherwise the aperture of electric expansion valve is adjusted to default initial opening, and keep the current operating conditions of frequency-conversion air-conditioning system, namely keep compressor and outer blower fan normally to run.
In this step, the first default aperture is 50 ~ 150 steps, and the second preset duration is 1 ~ 3 minute, and the 3rd preset temperature is 1 ~ 3 degree Celsius, and default initial opening is 150 ~ 300 steps.
S203: lack fluorine and judge.
Electronic expansion valve opening is kept or adjusts to second presetting aperture, and control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency from default original frequency, after being adjusted to predeterminated frequency, keep the 3rd preset duration.If the saturation temperature that the condensing pressure that pressure sensor detects is corresponding is less than or equal to outdoor environment temperature; or the difference of evaporator outlet temperature and evaporator temperature is greater than the 4th preset temperature and evaporator outlet temperature is greater than the difference of indoor temperature and the first preset temperature and outer machine pressure is less than or equal to preset pressure; then judge that this compressor is in scarce fluorine state; carry out scarce fluorine protection operation; otherwise judge that this compressor fluorine amount is normal, now keep compressor and described blower fan normally to run.
Predeterminated frequency is 50 ~ 90 hertz, and the 3rd preset duration is 1 ~ 4 minute, the 4th preset temperature 15 ~ 20 degrees Celsius.
S204: lack fluorine protection.
When determining compressor in scarce fluorine determination step for lacking fluorine state, compressor and exogenous wind office are closed, corresponding display unit shows corresponding fault cues, and send chimes of doom, note to point out the user of this frequency-conversion air-conditioning system, enable to obtain corresponding warning message in advance, to operate accordingly or to dispose, and then avoid compressor lack fluorine operation for a long time and cause refrigerating efficiency lowly even to burn out compressor.
S205: protection is determined.
Found through experiments, when scarce fluorine being protected by above-mentioned steps, sometimes may occur wrong report, at this moment need the possibility repeatedly repeating to detect to get rid of wrong report, for this reason, take following operation:
After first appearance lacks fluorine protection, record and show the fault-signal representing and lack fluorine state, then recording this fault.Again to start shooting after compressor and outer fan parking the 4th preset duration operation; again do not shut down after there is not abnormal scarce fluorine fault and increase a record; if determine to occur real scarce fluorine state after the accumulative number of stoppages reaches the preset failure number of times upper limit; now compressor and exogenous wind office are closed, operation of no longer starting shooting.
In this step, the 4th preset duration is 1 ~ 6 minute, the preset failure number of times upper limit preferably 3 times.By aforesaid operations, effectively can discharge the possibility of wrong report, increase the reliability of this method work.
Embodiment three
The present embodiment is with the R410A unit for a compressor frequency scope being 10 ~ 100 hertz, and wherein second of expansion valve the default aperture is 500 steps.Determine that the first preset temperature is 3 degrees Celsius through unit test data, the second preset temperature is 16 degrees Celsius, and the 3rd preset temperature is 2 degrees Celsius, and the 4th preset temperature is 20 degrees Celsius, and preset pressure is 3200kPa.Rule of thumb initial opening is preset in setting is 150 steps, and the first default aperture is 80 steps, and the second preset duration is 2 minutes, and the 3rd preset duration is 2 minutes, and the 4th preset duration is 5 minutes, and predeterminated frequency is 80 hertz.
Manually boot unit, after compressor reaches default original frequency 40 hertz operation end in three minutes, detecting that pressure sensor that now unit is arranged on condenser obtains current condensing pressure is 2300 kPas, calculating saturation temperature corresponding to this condensing pressure by built-in controller is 38 degrees Celsius, compare with current outdoor environment temperature 40 degrees Celsius, the saturation temperature that condenser pressure is corresponding is less than outdoor environment temperature, then can be judged as scarce fluorine, close compressor and outer blower fan, and display lacks fluorine fault on a display screen.Shut down after 5 minutes, judging that unit whether continuous appearance for three times lacks fluorine fault by controller counting, is lack fluorine protection first time here; therefore compressor restarts; and according to the preparation before compressor start by expansion valve opening, open to initial opening 150 step, compressor start.
Reach 40 hertz after compressor starts again, after operation terminates for three minutes, re-start the protection of scarce fluorine at the moment and judge.Pressure sensor detects that current condensing pressure is 2850 kPas, and corresponding saturation temperature is 45 degrees Celsius, and detect that now outdoor environment temperature is 40 degrees Celsius, then the saturation temperature not meeting condenser pressure corresponding is less than outdoor environment temperature.The evaporator temperature that unit detects evaporimeter is simultaneously 10 degrees Celsius, evaporator outlet temperature is 27 degrees Celsius, return air temperature is 28 degrees Celsius, now evaporator outlet temperature >=(return air temperature-3 DEG C), (evaporator outlet temperature-evaporator temperature) >=10 degrees Celsius, and outer machine pressure is less than or equal to 3200 kPas.Then compressor frequency remains unchanged, Current electronic expansion valve 340 step, reduces 80 steps under current aperture, is adjusted to 260 steps, detect that evaporimeter inlet pipe temperature is now 9 degrees Celsius, namely evaporating inlet pipe temperature≤(action front evaporator inlet pipe temperature-2 degrees Celsius) is false.Expansion valve leaves to maximum opening 500 step, and run 2 minutes, evaporimeter inlet pipe temperature is 13 degrees Celsius.Compressor raising frequency to 80 hertz, electronic expansion valve opening remains unchanged, and runs 2 minutes, detects that condensing pressure is 2900 kPas, outdoor environment temperature is 40 degrees Celsius.Then continuation detection return air temperature, evaporimeter inlet pipe temperature, evaporimeter go out pipe temperature, be respectively 29 degrees Celsius, 7 degrees Celsius and 28 degrees Celsius, and pressure sensor detected pressures is 2900 kPas, now lack fluorine fault again to set up, display screen display lacks fluorine fault, and compressor and outer blower fan stop simultaneously.Shut down 5 minutes, be judged as lacking fluorine fault for the second time in succession, compressor starts again.
Reach 40 hertz after compressor starts again, at the end of 40 hertz are run three minutes, enter next round and judge, describe above if similar and again meet scarce fluorine protective condition, then compressor shutdown is no longer opened
Embodiment four
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 3 provides for the another embodiment of the application and the schematic diagram of protection system.
As shown in Figure 3, the scarce fluorine that the present embodiment provides detects and protection system comprises: open state detection module 10, the scarce pre-determination module of fluorine 20, scarce fluorine determination module 30 and scarce fluorine protection module 40.
Open state detection module 10 is for detecting the outer machine pressure of the evaporator temperature of evaporimeter and evaporator outlet temperature, off-premises station, outdoor temperature and indoor temperature respectively, if meet exporting first of following condition to lack the pre-decision signal of fluorine, otherwise keep frequency-conversion air-conditioning system normally to run, do not do other operations.
1) saturation temperature that condensing pressure is corresponding is less than or equal to outdoor temperature.
2) evaporator temperature is greater than the difference of indoor temperature and the first preset temperature; And the difference of evaporator outlet temperature and evaporator temperature is greater than the second preset temperature; And the outer machine pressure of off-premises station is less than or equal to preset pressure.
In each condition above-mentioned, preset duration is 10 minutes for the first time, second default aperture is 300 ~ 500 steps, and the first preset temperature is 1 ~ 3 degree Celsius, and the second preset temperature is 10 ~ 18 degrees Celsius, preset pressure is 1600 ~ 3300 kPas, and default initial opening is 150 ~ 300 steps.
Lack the pre-determination module 20 of fluorine for after receiving open state detection signal, the running frequency keeping compressor current is constant, the electronic expansion valve opening of electric expansion valve is turned down first preset aperture and keep the second preset duration, if current evaporator temperature is less than or equal to the difference of the evaporator temperature before turning down and the 3rd preset temperature, then exports and lack fluorine decision signal; Otherwise, further the aperture of electric expansion valve is opened from default initial opening and preset aperture to second greatly, if now current evaporator temperature is more than or equal to the evaporator temperature before action and the 3rd preset temperature sum, then same output lacks fluorine decision signal, otherwise the aperture of electric expansion valve is adjusted to default initial opening, and keep the current operating conditions of frequency-conversion air-conditioning system, namely keep compressor and outer blower fan normally to run.
First default aperture is 50 ~ 150 steps, and the second preset duration is 1 ~ 3 minute, and the 3rd preset temperature is 1 ~ 3 degree Celsius, and default initial opening is 150 ~ 300 steps.
Lack fluorine determination module 30 for carrying out scarce fluorine judgement according to lacking the pre-decision signal of fluorine.
First electronic expansion valve opening is kept or adjust to second presetting aperture, and control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency from default original frequency, after being adjusted to predeterminated frequency, keep the 3rd preset duration.If the saturation temperature that the condensing pressure that pressure sensor detects is corresponding is less than or equal to outdoor environment temperature; or the difference of evaporator outlet temperature and evaporator temperature is greater than the 4th preset temperature and evaporator outlet temperature is greater than the difference of indoor temperature and the first preset temperature and outer machine pressure is less than or equal to preset pressure; then judge that this compressor is in scarce fluorine state; and export scarce fluorine guard signal; otherwise judge that this compressor fluorine amount is normal, now keep compressor and described blower fan normally to run.
Predeterminated frequency is 50 ~ 90 hertz, and the 3rd preset duration is 1 ~ 4 minute, the 4th preset temperature 15 ~ 20 degrees Celsius.
Lack fluorine protection module 40 for compressor and exogenous wind office being closed according to lacking fluorine guard signal; and in corresponding display unit, show corresponding fault cues; and send chimes of doom; note to point out the user of this frequency-conversion air-conditioning system; enable to obtain corresponding warning message in advance; to operate accordingly or to dispose, and then compressor is avoided to lack fluorine operation for a long time and cause refrigerating efficiency lowly even to burn out compressor.
As can be seen from technique scheme; scarce fluorine when this application provides the start of a kind of frequency-conversion air-conditioning system detects and protection system; this scarce fluorine detect and protection system when starting shooting by being arranged on the temperature-sensitive bag at the import of evaporimeter, the outlet of evaporimeter, indoor set and off-premises station place; and the pressure sensor be arranged on outer machine; respectively evaporator temperature, evaporator outlet temperature, indoor temperature, outdoor environment temperature and outdoor condensing pressure are detected, and carry out calculating and assessing according to testing result.Scarce fluorine judgement is progressively carried out when meeting pre-conditioned; when judging that compressor stops the operation of compressor and outer blower fan in time when being in scarce fluorine state; thus enable frequency-conversion air-conditioning system whether occur scarce fluorine through to place for a long time or detect when starting shooting after long-distance transportation and protect, and then avoid compressor to run under scarce fluorine state occurring that refrigerating efficiency is low, compressor abrasion aggravates or burns.
Embodiment five
Scarce fluorine detection during a kind of frequency-conversion air-conditioning system start that Fig. 4 provides for the another embodiment of the application and the schematic diagram of protection system.
As shown in Figure 4, the scarce fluorine that the present embodiment provides detects and protection system has set up protection determination module 50 on the basis of a upper embodiment.
Found through experiments, when scarce fluorine being protected by above-mentioned steps, sometimes may occur wrong report, at this moment need the possibility repeatedly repeating to detect to get rid of wrong report, set up this operational module for this reason.
Protect determination module 50 for after first appearance lacks fluorine protection, record and show the fault-signal representing and lack fluorine state, then recording this fault.Again to start shooting after compressor and outer fan parking the 4th preset duration operation; again do not shut down after there is not abnormal scarce fluorine fault and increase a record; if determine to occur real scarce fluorine state after the accumulative number of stoppages reaches the preset failure number of times upper limit; now compressor and exogenous wind office are closed, operation of no longer starting shooting.
4th preset duration is 1 ~ 6 minute, the preset failure number of times upper limit preferably 3 times.By aforesaid operations, effectively can discharge the possibility of wrong report, increase the reliability of native system work.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. scarce fluorine during frequency-conversion air-conditioning system start detects and a guard method, and described frequency-conversion air-conditioning system comprises compressor, condenser, electric expansion valve, evaporimeter and outer blower fan and pressure sensor, it is characterized in that, comprising:
After described frequency-conversion air-conditioning system start, when described compressor operating is to original frequency, detect each parameter of described frequency-conversion air-conditioning system, if saturation temperature corresponding to the condensing pressure that detects of described pressure sensor is less than or equal to outdoor environment temperature, then carry out scarce fluorine protection operation; Otherwise, if the evaporator outlet temperature of described evaporimeter is greater than the difference of indoor temperature and the first preset temperature, and the difference between the evaporator temperature of described evaporator outlet temperature and described evaporimeter is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure, then carry out scarce fluorine and judge in advance; Otherwise keep normal to run;
Described scarce fluorine judges to comprise in advance: the current running frequency keeping described compressor, the aperture of described electric expansion valve is turned down first preset aperture and continue the second preset duration, if current described evaporator temperature is less than or equal to the difference of the described evaporator temperature before turning down and the 3rd preset temperature, then carry out scarce fluorine judgement; Otherwise the aperture of described electric expansion valve is opened from default initial opening preset aperture to described second greatly further, if now current described evaporator temperature is more than or equal to the evaporator temperature before action and described 3rd preset temperature sum, then carry out scarce fluorine judgement, otherwise the aperture of described electric expansion valve is adjusted to default initial opening, and keeps described compressor and described outer blower fan normally to run;
Described scarce fluorine judges to comprise: the aperture of described electric expansion valve is remained on described second and preset aperture, control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency, and run the 3rd preset duration, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, or, the difference of described evaporator outlet temperature and described evaporator temperature is greater than the 4th preset temperature, and described evaporator outlet temperature is greater than the difference of indoor temperature and described first preset temperature, and described outer machine pressure is less than or equal to preset pressure, then judge that described compressor is in scarce fluorine state, carry out scarce fluorine protection operation, otherwise, described compressor and described blower fan is kept normally to run,
Described scarce fluorine protection comprises: close described compressor and described outer blower fan.
2. the fluorine that lacks as claimed in claim 1 detects and guard method, it is characterized in that, described first preset temperature is 1 ~ 3 degree Celsius, and described second preset temperature is 10 ~ 18 degrees Celsius, described 3rd preset temperature is 1 ~ 3 degree Celsius, and described 4th preset temperature is 15 ~ 20 degrees Celsius;
Described preset pressure is 1600 ~ 3300 kPas, and the described first default step-length is 150 ~ 300 steps, and the described second default step-length is 300 ~ 500 steps, and described default initial opening is 150 ~ 300 steps;
Described second preset duration is 1 ~ 3 minute, and described 3rd preset duration is 1 ~ 4 minute, and described predeterminated frequency is 50 ~ 90 hertz.
3. the fluorine that lacks as claimed in claim 1 or 2 detects and guard method, it is characterized in that, also comprises:
After carrying out described scarce fluorine protection at every turn, record and show the fault-signal representing and lack fluorine state, and record trouble number of times, after the 4th preset duration of pausing, the aperture of shown electric expansion valve is adjusted to described default initial opening, restarts described compressor and described outer blower fan;
Prescribe a time limit when the described number of stoppages is more than or equal on preset failure number of times, described compressor and described outer blower fan are remained on stopped status.
4. the fluorine that lacks as claimed in claim 3 detects and guard method, and it is characterized in that, described 4th preset duration is 1 ~ 6 minute, and the described preset failure number of times upper limit is 3 times.
5. the fluorine that lacks as claimed in claim 4 detects and guard method, it is characterized in that, when the variable frequency range of described compressor is 10 ~ 100 hertz:
Described first preset temperature is 3 degrees Celsius, and described second preset temperature is 16 degrees Celsius, and described 3rd preset temperature is 2 degrees Celsius, and described 4th preset temperature is 20 degrees Celsius;
Described first default aperture is 80 steps, and the described second default aperture is 500 steps, and described default initial opening is 150 steps;
Described preset pressure is 3200 kPas, and described second preset duration is 2 minutes, and described 3rd preset duration is 2 minutes, and described 4th preset duration is 5 minutes, and described predeterminated frequency is 80 hertz.
6. scarce fluorine during frequency-conversion air-conditioning system start detects and a protection system, and described frequency-conversion air-conditioning system comprises compressor, condenser, electric expansion valve, evaporimeter, outer blower fan and pressure sensor, it is characterized in that, comprising:
Open state detection module, for after described frequency-conversion air-conditioning system start, when described compressor operating is to original frequency, respectively evaporator temperature, evaporator outlet temperature, indoor temperature, outdoor environment temperature and outdoor condensing pressure are detected, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, then carry out scarce fluorine protection operation; Otherwise, if the evaporator outlet temperature of described evaporimeter is greater than the difference of indoor temperature and the first preset temperature, and the difference between the evaporator temperature of described evaporator outlet temperature and described evaporimeter is greater than the second preset temperature, and the outer machine pressure of off-premises station is less than or equal to preset pressure, then carry out scarce fluorine and judge in advance; Otherwise keep normal to run;
Lack the pre-determination module of fluorine, for keeping the current running frequency of described compressor according to described evaporator temperature detection signal, the aperture of described electric expansion valve is turned down first preset aperture and continue the second preset duration, if current described evaporator temperature is less than or equal to the difference of the described evaporator temperature before turning down and the 3rd preset temperature, then exports and lack fluorine decision signal; Otherwise the aperture of described electric expansion valve is opened from default initial opening preset aperture to described second greatly further, if now current described evaporator temperature is more than or equal to the evaporator temperature before action and described 3rd preset temperature sum, then export described scarce fluorine decision signal, otherwise the aperture of described electric expansion valve is adjusted to default initial opening, and keeps described compressor and described outer blower fan normally to run;
Lack fluorine determination module, aperture is preset with the aperture of described electric expansion valve being remained on described second according to described scarce fluorine decision signal, control compressor, with normal lifting frequency speed, running frequency is adjusted to predeterminated frequency, and run the 3rd preset duration, if the saturation temperature that the condensing pressure that described pressure sensor detects is corresponding is less than or equal to outdoor environment temperature, or, the difference of described evaporator outlet temperature and described evaporator temperature is greater than the 4th preset temperature, and described evaporator outlet temperature is greater than the difference of indoor temperature and described first preset temperature, and outer machine pressure is less than or equal to preset pressure, then judge that described compressor is in scarce fluorine state, export and lack fluorine guard signal, otherwise, described compressor and described blower fan is kept normally to run,
Lack fluorine protection module, for closing described compressor and described outer blower fan according to described scarce fluorine guard signal.
7. the fluorine that lacks as claimed in claim 6 detects and protection system, it is characterized in that, described first preset temperature is 1 ~ 3 degree Celsius, and described second preset temperature is 10 ~ 18 degrees Celsius, described 3rd preset temperature is 1 ~ 3 degree Celsius, and described 4th preset temperature is 15 ~ 20 degrees Celsius;
Described preset pressure is 1600 ~ 3300 kPas, and the described first default step-length is 150 ~ 300 steps, and the described second default step-length is 300 ~ 500 steps, and described default initial opening is 150 ~ 300 steps;
Described second preset duration is 1 ~ 3 minute, and described 3rd preset duration is 1 ~ 4 minute, and described predeterminated frequency is 50 ~ 90 hertz.
8. scarce fluorine as claimed in claims 6 or 7 detects and protection system, it is characterized in that, also comprises:
Protection determination module, for after carrying out described scarce fluorine protection at every turn, record and show the fault-signal representing and lack fluorine state, and record trouble number of times, after the 4th preset duration of pausing, the aperture of shown electric expansion valve is adjusted to described default initial opening, restarts described compressor and described outer blower fan;
Prescribe a time limit when the described number of stoppages is more than or equal on preset failure number of times, described compressor and described outer blower fan are remained on stopped status.
9. the fluorine that lacks as claimed in claim 8 detects and protection system, and it is characterized in that, described 4th preset duration is 1 ~ 6 minute, and the described preset failure number of times upper limit is 3 times.
10. the fluorine that lacks as claimed in claim 9 detects and protection system, it is characterized in that, when the variable frequency range of described compressor is 10 ~ 100 hertz:
Described first preset temperature is 3 degrees Celsius, and described second preset temperature is 16 degrees Celsius, and described 3rd preset temperature is 2 degrees Celsius, and described 4th preset temperature is 20 degrees Celsius;
Described first default aperture is 80 steps, and the described second default aperture is 500 steps, and described default initial opening is 150 steps;
Described preset pressure is 3200 kPas, and described second preset duration is 2 minutes, and described 3rd preset duration is 2 minutes, and described 4th preset duration is 5 minutes, and described predeterminated frequency is 80 hertz.
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