CN104807113A - Air conditioner outdoor unit, air conditioner outdoor unit defrosting judging system and air conditioner outdoor unit defrosting judging method - Google Patents
Air conditioner outdoor unit, air conditioner outdoor unit defrosting judging system and air conditioner outdoor unit defrosting judging method Download PDFInfo
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- CN104807113A CN104807113A CN201510222077.8A CN201510222077A CN104807113A CN 104807113 A CN104807113 A CN 104807113A CN 201510222077 A CN201510222077 A CN 201510222077A CN 104807113 A CN104807113 A CN 104807113A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the field of a refrigeration air conditioner of a steam compressor, in particular to an air conditioner outdoor unit, an air conditioner outdoor unit defrosting judging system and an air conditioner outdoor unit defrosting judging method. According to the air conditioner outdoor unit, the air conditioner outdoor unit defrosting judging system and the air conditioner outdoor unit defrosting judging method, disclosed by the invention, the air conditioner outdoor unit is internally and additionally provided with an anemograph which is used for detecting the air speed of an air outlet, whether an outdoor air-cooled heat exchanger is frosted or not can be judged by the air conditioner outdoor unit defrosting judging system by combining the changing situation of the air speed and the tube temperature of the outdoor air-cooled heat exchanger, defrosting can be carried out by controlling the state of a defrosting switch, the accuracy of judging the defrosting by the system is increased, the purposes that the defrosting can be carried out when frost exists and the defrosting cannot be carried out when no frost exists can be achieved, the defrosting period can be prolonged to the maximum, the influence on indoor air temperature by an air conditioner defrosting process can be reduced, and the using comfort of a user and the heating effect of the air conditioner are increased.
Description
Technical field
The present invention relates to vapour compression machine field of Refrigeration and Air-conditioning, particularly a kind of air-conditioner outdoor unit, air conditioner outdoor machine defrosting decision-making system and method.
Background technology
The compression-type refrigerating system of general air-conditioning is made up of compressor, condenser, evaporimeter and restricting element etc., closed system is formed according to being necessarily linked in sequence by pipeline, appropriate refrigerant is filled in closed system, under the effect of compressor, cold-producing medium out comes back to compressor through condenser, evaporimeter and throttle structure from compressor, heat is movement along with the movement of refrigerant, achieves the process of refrigerastion from evaporimeter heat absorption to condenser heat rejection.
Time air-conditioning system heats, heat is delivered to indoor outdoor by system, and outdoor unit heat exchanger serves as evaporimeter, if when the temperature of outdoor air is lower and humidity is higher, the water vapour in air will in outdoor heat exchanger surface condensation and frosting.The frosting of outdoor heat exchanger increases the heat transfer resistance between outdoor heat exchanger surface and air, add air-flow by flow resistance during outdoor heat exchanger, make to be reduced by the air mass flow of outdoor heat exchanger, heat exchange efficiency obviously reduces, not only affect indoor comfort, and cause system energy efficiency to decline.In order to prevent this phenomenon, outdoor heat exchanger frost amount exceeded a certain amount of time, needing the frost being melted outdoor heat exchanger by defrosting running, make it flow down and discharge outside machine.At present, the way of most of producer is all set time defrost, at low ambient temperatures, carry out judging whether frosting according to outdoor heat exchange organ pipe temperature, but reality is under worst cold case, outdoor heat exchanger not necessarily can frosting, if judged according to pipe temperature, erroneous judgement will be caused, increase defrost number of times, and usually need during defrost to become kind of refrigeration cycle by heating cyclic switching, using compressor as thermal source, the high-temperature gas flow of refrigerant from compressor is made to enter in outdoor heat exchanger to carry out defrost, thus cause indoor temperature significantly to decline, and the time that room temperature reaches needed for design temperature is elongated, the comfortableness that user uses is had a greatly reduced quality.Therefore, in order to improve user's comfort, should extend defrost periods as far as possible, reducing defrost number of times, having accomplished white defrost, frostless not defrost, how accurately whether frosting is crucial to decision-making system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of air-conditioner outdoor unit, air conditioner outdoor machine defrosting decision-making system and method, solve prior art defrost often, reduce the technical problem that user's comfort and power consumption increase.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of air-conditioner outdoor unit, comprise compressor 1, cross valve, outdoor fan, outdoor air cooling heat exchanger, the first off-premises station stop valve, the second off-premises station stop valve, pipe temperature checkout gear and wind speed detection device
Described compressor comprises exhaust outlet and gas returning port;
Described cross valve comprises exhaust port D, condensation port C, evaporimeter port E and air intake duct port S, and described exhaust port D connects the exhaust outlet of described compressor;
Described outdoor air cooling heat exchanger arrival end connects described cross valve condensation port C, and the port of export connects described first off-premises station stop valve; Described outdoor air cooling heat exchanger is provided with outdoor fan, and described outdoor fan air outlet place is provided with the wind speed detection device for gathering described outdoor fan air outlet wind speed;
Described second off-premises station stop valve connects the evaporimeter port E of described cross valve;
Described pipe temperature checkout gear is arranged between the described outdoor air cooling heat exchanger port of export and described cross valve air intake duct port S, for gathering the Guan Wen of described outdoor air cooling heat exchanger.
On the basis of technique scheme, the present invention can also do following improvement.
Further, also comprise gas-liquid separator, described gas-liquid separator arrival end connects described cross valve air intake duct port S, and the port of export connects the gas returning port of described compressor.
Further, electronic throttle parts are provided with between the described outdoor air cooling heat exchanger port of export and described first off-premises station stop valve.
Further, described electronic throttle parts are capillary, electric expansion valve or heating power expansion valve.
Further, described wind speed detection device is anemobiagraph; Described pipe temperature checkout gear is temperature sensor, and described temperature sensor is thermistor.
Further, described first off-premises station stop valve is liquid side stop valve; Described second off-premises station stop valve is for being gas side stop valve.
A kind of air conditioner outdoor machine defrosting decision-making system, comprise described air-conditioner outdoor unit, also comprise processor, described processor input connects described pipe temperature checkout gear and wind speed detection device, output connects defrost switch, the wind speed of the outdoor fan air outlet that described processor collects for the pipe temperature T of outdoor air cooling heat exchanger that receives described pipe temperature checkout gear and collect and described wind speed detection device, according to the size of pipe temperature T and default pipe temperature threshold value Ts, and the wind speed changing value of outdoor fan air outlet and the size of wind speed change threshold judge whether that carrying out defrosting processes, and control the state of defrost switch.
Further, described processor comprises timing unit, collecting unit, setup unit and judging unit,
Described timing unit is for calculating the heating operation time T1 of air-conditioner outdoor unit;
The pipe temperature T of outdoor air cooling heat exchanger, the wind speed of outdoor fan air outlet of described wind speed detection device transmission and/or the blower fan gear of described outdoor fan that described collecting unit sends for gathering described pipe temperature checkout gear;
Described setup unit is for setting the pipe temperature threshold value Ts of outdoor air cooling heat exchanger, the scope of the wind speed change threshold C of outdoor fan air outlet and described heating operation time T1;
Described judging unit is used for the pipe temperature T of more outdoor air cooling heat exchanger and the size of pipe temperature threshold value Ts, the wind speed changing value of described outdoor fan air outlet and the size of wind speed change threshold C and the blower fan gear change situation of described outdoor fan, and judged result is sent to described defrost switch.
A kind of air conditioner outdoor machine defrosting decision method, adopts described air conditioner outdoor machine defrosting decision-making system, comprises the following steps:
Step 1, the scope of wind speed setting change threshold C, the pipe temperature threshold value Ts of outdoor air cooling heat exchanger and heating operation time T1;
Step 2, outdoor fan 3 is selected suitable gear according to outdoor environment temperature and is heated;
Step 3, pipe temperature checkout gear 6 moment gathers the pipe temperature T of outdoor air cooling heat exchanger, and in heating operation time T1, continue the size judging pipe temperature T and default pipe temperature threshold value Ts, if pipe temperature T continues the T1 time and is less than pipe temperature threshold value Ts, and the blower fan gear of outdoor fan 3 remains unchanged, then gather wind speed B and the blower fan gear of described outdoor fan 3 in the described T1 time period in the outdoor fan exit at the end of wind speed A, the described heating operation time T1 in the outdoor fan exit when heating operation time, T1 started;
Step 4, according to the blower fan gear of described outdoor fan 3, wind speed change threshold C is selected in the scope of the wind speed change threshold C preset, judge the difference of wind speed A and wind speed B and the size of wind speed change threshold C, if the difference of wind speed A and wind speed B is greater than wind speed change threshold C, then judge outdoor air cooling heat exchanger 4 frosting of air-conditioner outdoor unit, enter step 5; If the difference of wind speed A and wind speed B is not more than wind speed change threshold C, then judge that the outdoor air cooling heat exchanger 4 of air-conditioner outdoor unit does not have frosting, air-conditioning continues to run;
Step 5, starts defrost, until default stopping defrost condition detected, exits defrost, and enter step 1, so circulate.
Further, described step 3 is specially:
Step 301, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and the size of pipe temperature threshold value Ts judging pipe temperature T and preset, if pipe temperature T is not less than pipe temperature threshold value Ts, then air-conditioner outdoor unit continuation normally operation; If pipe temperature T is less than pipe temperature threshold value Ts, then the blower fan gear recorded now is the first blower fan gear, and the wind speed gathering outdoor fan exit is designated as wind speed A, enters step 302;
Step 302, starts timing, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and within the described T1 time period, lastingly judges whether pipe temperature T is less than pipe temperature threshold value Ts, if not, then, when judging that pipe temperature T is less than pipe temperature threshold value Ts again, restarts timing; If so, then step 303 is entered;
Step 303, at the end of the described T1 time, gathers now blower fan gear and is designated as the second blower fan gear, the wind speed gathering outdoor fan exit is designated as wind speed B, and judge that whether the first blower fan gear is identical with the second blower fan gear, if identical, then calculates the difference of wind speed A and wind speed B; If not identical, then described second blower fan gear and wind speed B be recorded as the first new blower fan gear and wind speed A respectively again, and repeat step 302.
Further, the span of described pipe temperature threshold value Ts is-13 DEG C≤Ts≤2 DEG C; The span of described heating operation time T1 is 40min≤T1≤120min; The span of described wind speed change threshold C is 0.1m/s≤C≤0.5m/s.
Further, described blower fan gear comprises low wind shelves, apoplexy shelves and high wind shelves; The span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.2m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.2m/s≤C < 0.3m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.3m/s≤C≤0.4m/s;
Or the span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.3m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.3m/s≤C < 0.4m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.4m/s≤C≤0.5m/s;
Or the span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.2m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.2m/s≤C < 0.35m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.35m/s≤C≤0.5m/s.
The invention has the beneficial effects as follows: the present invention increases by one for detecting the anemobiagraph of air port wind speed in air-conditioner outdoor unit, air conditioner outdoor machine defrosting decision-making system judges the whether frosting of outdoor air cooling heat exchanger in conjunction with the situation of change of wind speed and the pipe temperature of outdoor air cooling heat exchanger, and the state controlling defrost switch defrosts, improve the accuracy that system judges defrosting, accomplish white defrost, frostless not defrost, defrost periods can not only be extended to greatest extent, reduce air-conditioner defrost process to the impact of indoor air temperature, and improve the comfort of user and the heating effect of air-conditioning.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of air-conditioner outdoor unit of the present invention;
Fig. 2 is air conditioner outdoor machine defrosting decision-making system structure chart of the present invention;
Fig. 3 is the flow chart of air conditioner outdoor machine defrosting decision method of the present invention;
In accompanying drawing, the list of parts representated by each label is as follows:
1, compressor, 2, cross valve, 3, outdoor fan, 4, outdoor air cooling heat exchanger, 5, electronic throttle parts, 6, pipe temperature checkout gear, 7, gas-liquid separator, the 8, first off-premises station stop valve, the 9, second off-premises station stop valve, 10, wind speed detection device.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, for the system construction drawing of the present embodiment air-conditioner outdoor unit, comprise compressor 1, cross valve 2, outdoor fan 3, outdoor air cooling heat exchanger 4, electronic throttle parts 5, gas-liquid separator 7, first off-premises station stop valve 8, second off-premises station stop valve 9, pipe temperature checkout gear 6 and wind speed detection device 10, in the present embodiment, first off-premises station stop valve 8 is liquid side stop valve, described second off-premises station stop valve is 9 is gas side stop valve, described wind speed detection device 10 is anemobiagraph, described pipe temperature checkout gear 6 is temperature sensor, described temperature sensor is thermistor.The judgement whether temperature sensor of the present embodiment can perform defrost operation for processor provides data foundation accurately, thus ensure that the accuracy that system defrosting judges, and the advantages such as thermistor has that volume is little, highly sensitive, good stability, easily machine-shaping, use thermistor as the Guan Wen of temperature sensor sensing chamber external air cooling system heat exchanger, effectively can ensure the accuracy of testing result.
In the present embodiment, described compressor 1 comprises exhaust outlet and gas returning port, and refrigerant to be sucked in the compression chamber of compressor 1 through gas returning port and to be compressed in this compression chamber, becomes the cold media gas of HTHP, then discharges compressor 1 by the exhaust outlet of compressor 1; Described cross valve 2 comprises exhaust port D, condensation port C, evaporimeter port E and air intake duct port S, and described exhaust port D connects the exhaust outlet of described compressor 1; Described outdoor air cooling heat exchanger 4 arrival end connects described cross valve 2 condensation port C, and the port of export connects described first off-premises station stop valve 8; Described outdoor air cooling heat exchanger 4 is provided with outdoor fan 3, and described outdoor fan 3 air outlet place is provided with the anemobiagraph for gathering described outdoor fan air outlet wind speed; Described gas-liquid separator 7 arrival end connects described cross valve 2 air intake duct port S, and the port of export connects the gas returning port of described compressor 1; Electronic throttle parts 5 are provided with between described outdoor air cooling heat exchanger 4 port of export and described first off-premises station stop valve 8; Described second off-premises station stop valve 9 connects the evaporimeter port E of described cross valve 2; Described temperature sensor is arranged between described outdoor air cooling heat exchanger 4 port of export and described cross valve 2 air intake duct port S, for gathering the Guan Wen of described outdoor air cooling heat exchanger 4.In the present embodiment, described electronic throttle parts 5 are heating power expansion valve, and in other embodiments, described electronic throttle parts 5 can also be capillary or electric expansion valve.Capillary or electric expansion valve or heating power expansion valve all have good throttling action, and wherein, the aperture of electric expansion valve and heating power expansion valve can degree of supercooling as required control, and the production cost of capillary low, assemble simple and convenient.In the present embodiment, adopt gas-liquid separator gas coolant can be separated with liquid refrigerants, prevent liquid refrigerants from entering through the air inlet pipe of compressor, and cause the phenomenon of liquid refrigerants liquid hazards compressor, thus improve the functional reliability of this air-conditioner outdoor unit.
Need explanation, here exhaust outlet is connected should makes broad understanding with exhaust port D, namely can be not directly be connected, such as in one embodiment of the invention, oil eliminator (scheming not shown) is also provided with between exhaust outlet and exhaust port D, that is, the exhaust outlet of compressor 1 is indirectly connected with the exhaust port D of cross valve 2 by oil eliminator.Wherein, oil eliminator has been prior art, is not therefore just described in detail here.
When air-conditioner outdoor unit heats operation, after refrigerant is compressed in compressor 1, exhaust outlet through compressor 1 enters cross valve 2, the now DE conducting of cross valve 2, refrigerant after compression discharge from the evaporimeter port E of cross valve after through the second off-premises station stop valve 9, namely gas side stop valve flow out after after the condensation of indoor set heat exchanger (not shown) from the first off-premises station stop valve 8, namely electronic throttle parts 5 got back to by liquid side stop valve, and become low-pressure liquid refrigerant to enter outdoor air cooling heat exchanger 3 by electronic throttle parts 5 throttling to carry out heat exchange, low-pressure gaseous refrigerant after evaporation is entering cross valve 2, the now CS conducting of cross valve 2, low-pressure gaseous refrigerant enters gas-liquid separator 7 from the air intake duct port S of cross valve 2, and after gas-liquid separator 7 is separated, enter the gas returning port of compressor 1, complete and once heat circulation.
As shown in Figure 2, for a kind of air conditioner outdoor machine defrosting decision-making system of the embodiment of the present invention, comprise the air-conditioner outdoor unit in accompanying drawing 1 and processor, described processor input connects described pipe temperature checkout gear 6 and wind speed detection device 10, output connects defrost switch, the wind speed of the outdoor fan air outlet that described processor collects for the pipe temperature T of outdoor air cooling heat exchanger that receives described pipe temperature checkout gear 6 and collect and described wind speed detection device 10, according to the size of pipe temperature T and default pipe temperature threshold value Ts, and the wind speed changing value of outdoor fan air outlet and the size of wind speed change threshold judge whether that carrying out defrosting processes, and control the state of defrost switch.
In the present embodiment, described processor comprises timing unit, collecting unit, setup unit and judging unit, and described timing unit is for calculating the heating operation time T1 of air-conditioner outdoor unit; The pipe temperature T of outdoor air cooling heat exchanger, the wind speed of outdoor fan air outlet of described wind speed detection device 10 transmission and/or the blower fan gear of described outdoor fan 3 that described collecting unit sends for gathering described pipe temperature checkout gear 6; Described setup unit is for setting the pipe temperature threshold value Ts of outdoor air cooling heat exchanger, the scope of the wind speed change threshold C of outdoor fan air outlet and described heating operation time T1; Described judging unit is used for the pipe temperature T of more outdoor air cooling heat exchanger and the size of pipe temperature threshold value Ts, the wind speed changing value of described outdoor fan air outlet and the size of wind speed change threshold C and the blower fan gear change situation of described outdoor fan 3, and judged result is sent to described defrost switch.
As shown in Figure 3, be a kind of air conditioner outdoor machine defrosting decision method of the embodiment of the present invention, adopt above-mentioned air conditioner outdoor machine defrosting decision-making system, comprise the following steps:
Step 1, the pipe temperature threshold value Ts setting outdoor air cooling heat exchanger is 0 DEG C, heating operation time T1 is 40min, wind speed change threshold C scope is 0.1m/s≤C≤0.5m/s;
Step 2, outdoor fan 3 is selected high wind gear according to outdoor environment temperature and is heated;
Step 301, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and the size judging pipe temperature T and the pipe temperature threshold value Ts preset; If pipe temperature T is not less than 0 DEG C, then air-conditioner outdoor unit continues normal operation; If pipe temperature T is less than 0 DEG C, then the high wind gear recorded now is the first blower fan gear, and the wind speed gathering outdoor fan exit is designated as wind speed A, enters step 302;
Step 302, starts timing, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and judges whether pipe temperature T continues to be less than 0 DEG C in 40min, if not, then, when judging that pipe temperature T is less than 0 DEG C again, restarts timing; If so, then step 303 is entered;
Step 303, the outdoor fan gear gathered at the end of 40min is designated as the second blower fan gear, the wind speed in outdoor fan exit is designated as wind speed B, and judge that whether the first blower fan gear is identical with the second blower fan gear, if identical, then calculate the difference of wind speed A and wind speed B, in the present embodiment, the first blower fan gear and the second blower fan gear are high wind gear; If not identical, then described second blower fan gear and wind speed B be recorded as the first new blower fan gear and wind speed A respectively again, and repeat step 302;
Step 4, according to the high wind gear of described outdoor fan 3, wind speed change threshold C is selected to be 0.45m/s, judge the difference of wind speed A and wind speed B and the size of 0.45m/s, if the difference of wind speed A and wind speed B is greater than 0.45m/s, then judge outdoor air cooling heat exchanger 4 frosting of air-conditioner outdoor unit, enter step 5; If the difference of wind speed A and wind speed B is not more than 0.45m/s, then judge that the outdoor air cooling heat exchanger 4 of air-conditioner outdoor unit does not have frosting, air-conditioning continues to run;
Step 5, starts defrost, until detect that outdoor air cooling heat exchanger pipe temperature T is more than or equal to 15 DEG C, exits defrost.In the present embodiment, the stopping defrost condition preset is that outdoor air cooling heat exchanger pipe temperature T is more than or equal to 15 DEG C.
In the present embodiment, pipe temperature checkout gear 6 is temperature sensor, and the acquisition interval of temperature sensor is 1 second, so not only can monitor the pipe temperature T of outdoor air cooling heat exchanger the moment, and temperature sensor is by detecting voltage and resistance signal, be sent to mainboard control chip, the process converting temperature value to consumes energy hardly, can not increase power consumption.In order to ensure efficiency of heat exchanger and heating effect, need heating operation time T1 when pipe temperature threshold value Ts being rationally set and detecting wind speed B, generally, Ts is lower, T1 should be shorter, in the present embodiment, Ts is set as 0 DEG C, T1 is set as 40min, in other embodiments, according to actual conditions, the gear of such as outdoor fan, environment temperature etc., Ts can be set as-13 DEG C, 2 DEG C, 5 DEG C, arbitrary value between 0 DEG C and-13 DEG C ~ 2 DEG C, and T1 is according to the value of Ts, can be 40min, 60min, 80min, arbitrary value between 120min and 40min ~ 120min.
In the present embodiment, when comparing judgement, wind speed change threshold C is relevant with blower fan gear, and blower fan gear is low, then C value is lower; Blower fan gear is high, then C value is higher.Can preset the scope of wind speed change threshold C, set C value span in such as above-described embodiment between 0.1m/s ~ 0.5m/s, judging unit, when judging, according to the blower fan gear collected, selects suitable C value to judge within the scope of C value.
In other embodiments, can also preset the C value range size that different blower fan gear is corresponding, as shown in following table 1, table 2, table 3, be the C value scope that different blower fan gear is corresponding.Judging unit, when judging, according to the blower fan gear collected, selects suitable C value to judge within the scope of the C value that following table is corresponding.
The first blower fan gear of table 1 is corresponding with wind speed change threshold C to be shown
| Wind shelves | C value scope |
| Low wind shelves | 0.1m/s≤C＜0.2m/s |
| Apoplexy shelves | 0.2m/s≤C＜0.3m/s |
| High wind shelves | 0.3m/s≤C≤0.4m/s |
Table 2 the second blower fan gear is corresponding with wind speed change threshold C to be shown
| Wind shelves | C value scope |
| Low wind shelves | 0.1m/s≤C＜0.3m/s |
| Apoplexy shelves | 0.3m/s≤C＜0.4m/s |
| High wind shelves | 0.4m/s≤C≤0.5m/s |
The third blower fan gear of table 3 is corresponding with wind speed change threshold C to be shown
| Wind shelves | C value scope |
| Low wind shelves | 0.1m/s≤C＜0.2m/s |
| Apoplexy shelves | 0.2m/s≤C＜0.35m/s |
| High wind shelves | 0.35m/s≤C≤0.5m/s |
The present invention increases by one for detecting the anemobiagraph of air port wind speed in air-conditioner outdoor unit, air conditioner outdoor machine defrosting decision-making system judges the whether frosting of outdoor air cooling heat exchanger in conjunction with the situation of change of wind speed and the pipe temperature of outdoor air cooling heat exchanger, and the state controlling defrost switch defrosts, improve the accuracy that system judges defrosting, accomplish white defrost, frostless not defrost, defrost periods can not only be extended to greatest extent, reduce air-conditioner defrost process to the impact of indoor air temperature, and improve the comfort of user and the heating effect of air-conditioning.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an air-conditioner outdoor unit, it is characterized in that: comprise compressor (1), cross valve (2), outdoor fan (3), outdoor air cooling heat exchanger (4), the first off-premises station stop valve (8), the second off-premises station stop valve (9), pipe temperature checkout gear (6) and wind speed detection device (10)
Described compressor (1) comprises exhaust outlet and gas returning port;
Described cross valve (2) comprises exhaust port D, condensation port C, evaporimeter port E and air intake duct port S, and described exhaust port D connects the exhaust outlet of described compressor (1);
Described outdoor air cooling heat exchanger (4) arrival end connects described cross valve (2) condensation port C, and the port of export connects described first off-premises station stop valve (8); Described outdoor air cooling heat exchanger (4) is provided with outdoor fan (3), and described outdoor fan (3) air outlet place is provided with the wind speed detection device (10) for gathering described outdoor fan air outlet wind speed;
Described second off-premises station stop valve (9) connects the evaporimeter port E of described cross valve (2);
Described pipe temperature checkout gear (6) is arranged between described outdoor air cooling heat exchanger (4) port of export and described cross valve (2) air intake duct port S, for gathering the Guan Wen of described outdoor air cooling heat exchanger (4).
2. air-conditioner outdoor unit according to claim 1, it is characterized in that: also comprise gas-liquid separator (7), described gas-liquid separator (7) arrival end connects described cross valve (2) air intake duct port S, and the port of export connects the gas returning port of described compressor (1).
3. air-conditioner outdoor unit according to claim 1, is characterized in that: be provided with electronic throttle parts (5) between described outdoor air cooling heat exchanger (4) port of export and described first off-premises station stop valve (8); Described electronic throttle parts (5) are capillary, electric expansion valve or heating power expansion valve.
4., according to the arbitrary described air-conditioner outdoor unit of claims 1 to 3, it is characterized in that: described wind speed detection device (10) is anemobiagraph; Described pipe temperature checkout gear (6) is temperature sensor, and described temperature sensor is thermistor.
5. an air conditioner outdoor machine defrosting decision-making system, comprise the arbitrary described air-conditioner outdoor unit of Claims 1 to 4, it is characterized in that, also comprise processor, described processor input connects described pipe temperature checkout gear (6) and wind speed detection device (10), output connects defrost switch, the wind speed of the outdoor fan air outlet that described processor collects for the pipe temperature T of outdoor air cooling heat exchanger that receives described pipe temperature checkout gear (6) and collect and described wind speed detection device (10), according to the size of pipe temperature T and default pipe temperature threshold value Ts, and the wind speed changing value of outdoor fan air outlet and the size of wind speed change threshold judge whether that carrying out defrosting processes, and control the state of defrost switch.
6. defrosting decision-making system according to claim 5, is characterized in that: described processor comprises timing unit, collecting unit, setup unit and judging unit,
Described timing unit is for calculating the heating operation time T1 of air-conditioner outdoor unit;
The wind speed of outdoor fan air outlet that described collecting unit sends for the pipe temperature T of the outdoor air cooling heat exchanger that gathers described pipe temperature checkout gear (6) and send, described wind speed detection device (10) and/or the blower fan gear of described outdoor fan (3);
Described setup unit is for setting the pipe temperature threshold value Ts of outdoor air cooling heat exchanger, the scope of the wind speed change threshold C of outdoor fan air outlet and described heating operation time T1;
Described judging unit is used for the pipe temperature T of more outdoor air cooling heat exchanger and the size of pipe temperature threshold value Ts, the wind speed changing value of described outdoor fan air outlet and the size of wind speed change threshold C and the blower fan gear change situation of described outdoor fan (3), and judged result is sent to described defrost switch.
7. an air conditioner outdoor machine defrosting decision method, adopt the air conditioner outdoor machine defrosting decision-making system described in claim 5 or 6, described air conditioner outdoor machine defrosting decision method comprises the following steps:
Step 1, the scope of wind speed setting change threshold C, the pipe temperature threshold value Ts of outdoor air cooling heat exchanger and heating operation time T1;
Step 2, outdoor fan 3 is selected suitable gear according to outdoor environment temperature and is heated;
Step 3, pipe temperature checkout gear 6 moment gathers the pipe temperature T of outdoor air cooling heat exchanger, and in heating operation time T1, continue the size judging pipe temperature T and default pipe temperature threshold value Ts, if pipe temperature T continues the T1 time and is less than pipe temperature threshold value Ts, and the blower fan gear of outdoor fan 3 remains unchanged, then gather wind speed B and the blower fan gear of described outdoor fan 3 in the described T1 time period in the outdoor fan exit at the end of wind speed A, the described heating operation time T1 in the outdoor fan exit when heating operation time, T1 started;
Step 4, according to the blower fan gear of described outdoor fan 3, wind speed change threshold C is selected in the scope of the wind speed change threshold C preset, judge the difference of wind speed A and wind speed B and the size of wind speed change threshold C, if the difference of wind speed A and wind speed B is greater than wind speed change threshold C, then judge outdoor air cooling heat exchanger 4 frosting of air-conditioner outdoor unit, enter step 5; If the difference of wind speed A and wind speed B is not more than wind speed change threshold C, then judge that the outdoor air cooling heat exchanger 4 of air-conditioner outdoor unit does not have frosting, air-conditioning continues to run;
Step 5, starts defrost, until default stopping defrost condition detected, exits defrost, and enter step 1, so circulate.
8. air conditioner outdoor machine defrosting decision method according to claim 7, is characterized in that: described step 3 is specially:
Step 301, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and the size of pipe temperature threshold value Ts judging pipe temperature T and preset, if pipe temperature T is not less than pipe temperature threshold value Ts, then air-conditioner outdoor unit continuation normally operation; If pipe temperature T is less than pipe temperature threshold value Ts, then the blower fan gear recorded now is the first blower fan gear, and the wind speed gathering outdoor fan exit is designated as wind speed A, enters step 302;
Step 302, starts timing, the pipe temperature T of collection per second once outdoor air cooling heat exchanger, and within the described T1 time period, lastingly judges whether pipe temperature T is less than pipe temperature threshold value Ts, if not, then, when judging that pipe temperature T is less than pipe temperature threshold value Ts again, restarts timing; If so, then step 303 is entered;
Step 303, at the end of the described T1 time, gathers now blower fan gear and is designated as the second blower fan gear, the wind speed gathering outdoor fan exit is designated as wind speed B, and judge that whether the first blower fan gear is identical with the second blower fan gear, if identical, then calculates the difference of wind speed A and wind speed B; If not identical, then described second blower fan gear and wind speed B be recorded as the first new blower fan gear and wind speed A respectively again, and repeat step 302.
9. the air conditioner outdoor machine defrosting decision method according to claim 7 or 8, is characterized in that: the span of described pipe temperature threshold value Ts is-13 DEG C≤Ts≤2 DEG C; The span of described heating operation time T1 is 40min≤T1≤120min; The span of described wind speed change threshold C is 0.1m/s≤C≤0.5m/s.
10. air conditioner outdoor machine defrosting decision method according to claim 9, is characterized in that: described blower fan gear comprises low wind shelves, apoplexy shelves and high wind shelves; The span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.2m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.2m/s≤C < 0.3m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.3m/s≤C≤0.4m/s;
Or the span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.3m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.3m/s≤C < 0.4m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.4m/s≤C≤0.5m/s;
Or the span of described low wind shelves corresponding wind speed change threshold C is 0.1m/s≤C < 0.2m/s, the span of described apoplexy shelves corresponding wind speed change threshold C is 0.2m/s≤C < 0.35m/s, and the span of described high wind shelves corresponding wind speed change threshold C is 0.35m/s≤C≤0.5m/s.
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