CN103591669B

CN103591669B - The antifrost method of air-conditioning equipment and antifrost device, air-conditioning equipment

Info

Publication number: CN103591669B
Application number: CN201310492192.8A
Authority: CN
Inventors: 李永镇; 张�浩; 谭周衡; 晏玉林
Original assignee: Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2013-10-18
Filing date: 2013-10-18
Publication date: 2016-03-30
Anticipated expiration: 2033-10-18
Also published as: CN103591669A

Abstract

The invention provides a kind of antifrost method of air-conditioning equipment, comprising: obtain the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Judge whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; If it is determined that the presence of frosting risk, then by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk.The present invention also correspondingly proposes a kind of antifrost device of air-conditioning equipment and a kind of air-conditioning equipment.By technical scheme of the present invention, can Timeliness coverage effectively eliminate the frosting risk of the outdoor unit heat exchanger of air-conditioning equipment, the generation of prevention frost, avoids defrost process to make troubles to user, contributes to the experience promoting user.

Description

The antifrost method of air-conditioning equipment and antifrost device, air-conditioning equipment

Technical field

The present invention relates to air conditioner technical field, in particular to a kind of antifrost method and antifrost device of air-conditioning equipment, and a kind of air-conditioning equipment.

Background technology

For the air-conditioning equipment being configured with off-premises station, low-temperature heating run process in, often cause the dew condensation phenomenon on outdoor unit heat exchanger, and if the temperature of surrounding environment is lower, then may cause condensation frosting further, have a strong impact on the service behaviour of outdoor unit heat exchanger.

In correlation technique, air-conditioning equipment after outdoor unit heat exchanger generation frost, can remove frost layer by defrost operation.Particularly, switch as by cross valve, use indoor heat to heat outdoor unit heat exchanger, cause defrost process very large on the impact of indoor comfort.

Therefore, how effectively to process the frosting problem of outdoor unit heat exchanger, defrost process can be avoided again the impact of indoor comfort, become technical problem urgently to be resolved hurrily at present.

Summary of the invention

The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.

For this reason, one object of the present invention is a kind of antifrost method proposing air-conditioning equipment.

Another object of the present invention is the antifrost device proposing a kind of air-conditioning equipment.

Another object of the present invention is to propose a kind of air-conditioning equipment.

For achieving the above object, embodiment according to a first aspect of the invention, proposes a kind of antifrost method of air-conditioning equipment, comprising: obtain the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Judge whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; If it is determined that the presence of frosting risk, then by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk.

Antifrost method according to an embodiment of the invention, the frost of outdoor unit heat exchanger, first needs to form condensation on outdoor unit heat exchanger surface; Further, if external environment temperature is lower, condensation is frozen, will frost layer be formed.In a kind of situation, after outdoor unit heat exchanger surface forms condensation, if environment temperature is lower, in the possible short time, will frost layer be formed, thus there is frosting risk; In another kind of situation, if current environmental temperature is higher, condensation temporarily can not form frost layer, if but after a period of time, when environment temperature declines, still there is condensation, then still there is frosting risk.

Visible, by obtaining the evaporating temperature of outdoor unit heat exchanger and the condensation temperature of outdoor, effectively can judge currently whether dew condensation phenomenon may occur, thus determine whether there is frosting risk further, contribute to improving the judgment accuracy to frosting risk, avoid the frost of outdoor unit heat exchanger as much as possible, guarantee the comfortableness of indoor.

Because outdoor unit heat exchanger is used for the heat outside absorption chamber, for indoor heating, thus cause the evaporating temperature of outdoor unit heat exchanger lower, easily condensation and frost occur.Therefore, antifrost method according to an embodiment of the invention, when there is frosting risk, by reducing the heat exchange amount of outdoor unit heat exchanger, outdoor unit heat exchanger can be slowed down from surrounding environment, absorb heat, thus contribute to the rise of the evaporating temperature of outdoor unit heat exchanger, avoid condensation or frost occur, also just do not need to remove frost layer by defrost operation, reduce the impact of the comfortableness on indoor as much as possible.

Meanwhile, due to when reducing the heat exchange amount of outdoor unit heat exchanger, the heat not in absorption chamber, thus compared to defrost operation, by to the detection of frosting risk and elimination, less on the comfortableness impact of indoor, be conducive to the experience promoting user.

In addition, the antifrost method of air-conditioning equipment according to the above embodiment of the present invention, can also have following additional technical characteristic:

According to one embodiment of present invention, describedly judge whether that the process that there is frosting risk comprises: judge whether described evaporating temperature meets first condition: be less than or equal to early warning temperature, wherein, described early warning temperature equals described dew-point temperature or exceeds preset temperature than described dew-point temperature poor; If meet described first condition, then it is determined that the presence of frosting risk.

Due to when evaporating temperature is less than dew-point temperature, the moisture in air will form condensation on outdoor unit heat exchanger surface, thus according to the antifrost method of the embodiment of the present invention, evaporating temperature should be made to be increased to and be greater than dew-point temperature, to eliminate frosting risk.

Particularly, in one case, can directly judge the size of evaporating temperature and dew-point temperature, make when detecting that evaporating temperature is less than or equal to dew-point temperature, evaporating temperature can be improved in time, avoid producing condensation as far as possible, thus frosting risk can be eliminated.

In another case, early warning temperature can be set as higher than condensation temperature, concrete preset temperature difference can be set by manufacturer or user, make evaporating temperature can really all the time higher than dew-point temperature, guarantee that the surface of outdoor unit heat exchanger can not form condensation, more can not there is frosting, thus contribute to the control time shortening exchange heat as much as possible, reduce the impact on indoor.

According to another embodiment of the invention, judge whether described in that the process that there is frosting risk also comprises: judge whether described evaporating temperature meets second condition: be less than or equal to freezing point temperature; If meet described first condition and described second condition simultaneously, then it is determined that the presence of frosting risk.

According to antifrost method of the present invention, " frosting risk " refers to the generation that may cause frost, if but ambient temperature is higher time, then currently only may can generate condensation, and temporarily can not form frost layer.Therefore, by comparing further evaporating temperature, can determine the current risk that whether there is formation frost layer, the temperature if evaporating temperature is below the freezing point, just determines to there is frosting risk, makes judged result have more reference value in current slot.In this embodiment, for the elimination of frosting risk, can make evaporating temperature higher than condensation temperature the temperature that is below the freezing point, also can higher than freezing point temperature lower than condensation temperature, can also simultaneously higher than condensation temperature and freezing point temperature.

Certainly, freezing point temperature not necessarily 0 degree (degree Celsius/DEG C).Such as a normal atmosphere pressure, water starts to freeze below 0 degree; And along with atmospheric change, the temperature that water-setting build-ups ice may change, the temperature value of thus concrete second condition, may change with the difference of landing pit, this numerical value by factory default, also can be arranged or amendment according to actual conditions by user.

According to one embodiment of present invention, the process obtaining described dew-point temperature comprises various ways, such as: (1) utilizes ambient temperature information and the humidity information of the outdoor collected, and calculates described dew-point temperature according to preset formula; Or (2) set up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor, and from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature; Or (3) set up in advance and memory time information and the dew-point temperature of outdoor between the second relation table, and from described second relation table, search the dew-point temperature corresponding with current time; Or other modes, will not enumerate.

For mode (1), by real-time temperature acquisition and calculating, contribute to improving the precision of Temperature numerical and the accuracy of judgement.For mode (2), adopt the mode of the first relation table set up in advance, combine the collection in real time to dry-bulb temperature and wet-bulb temperature, while reducing real-time amount of calculation compared to mode (1), also can guarantee the accuracy of judgement.For mode (3), because the temperature and humidity situation of each area in certain hour section has certain regularity, such as north of china in winter temperature is relatively low, comparatively dry, south winter temperature is relatively high, comparatively moist, thus can for the dew-point temperature of different geographical in different time sections, set up the second relation table, thus while reducing amount of calculation further, ensure that the accuracy of dew-point temperature to a certain extent.Wherein, it is one or more that temporal information can comprise in morning and evening in season, month, one day, current residing time interval etc., and more temporal information contributes to the accuracy improving dew-point temperature.

According to one embodiment of present invention, when described air-conditioning equipment is configured with frequency-changeable compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform down conversion process to described frequency-changeable compressor; When described air-conditioning equipment is configured with invariable frequency compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform hesitation process to described invariable frequency compressor.

According to antifrost method of the present invention, for frequency-changeable compressor, the mode of frequency reducing can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, thus the frosting risk of outdoor unit heat exchanger can be eliminated on the one hand, the impact of the comfortableness on indoor can be avoided on the other hand as far as possible.For invariable frequency compressor, the mode of hesitation can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, although the heat supply to indoor can be suspended, obtain heat indoor compared in defrost process, still relatively less on the impact of indoor; Meanwhile, owing to just there is frosting risk, processing procedure is obviously more prone to than elimination frost layer and easily, thus down time ratio defrosting time is relatively shorter, also relatively less on the impact being interior survey.

According to one embodiment of present invention, the process of described frequency-changeable compressor execution down conversion process is comprised: the operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency; Or the operating frequency of described frequency-changeable compressor is progressively reduced according to preset ratio.

According to antifrost method of the present invention, to the frequency reducing process of frequency-changeable compressor, also different processing modes can be adopted, as by directly operating frequency being down to predeterminated frequency, then contribute to shortening the processing time to frosting risk, or by progressively operating frequency being down to predeterminated frequency, then making to gradually reduce the heating load of indoor, contributing to reducing the impact on indoor.Wherein, predeterminated frequency can be certain the concrete frequency values pre-set, and also can be the relative changing value relative to different ongoing frequency, such as reduce 80% of ongoing frequency, or both all have, therefrom select according to user's actual needs.

According to one embodiment of present invention, if it is determined that the presence of frosting risk, then described antifrost method also comprises: heat described outdoor unit heat exchanger.

According to antifrost method of the present invention, for being configured with the air-conditioning equipment determining frequency or frequency-changeable compressor, all can heat outdoor unit heat exchanger.Wherein, the mode heated exists a variety of, in such as a kind of situation, can by machine heat exchanger disposed in the outdoor inner or outside as electric heater unit, directly outdoor unit heat exchanger is heated, in another kind of situation, also can adopt the mode that other parts are heated, indirectly realize the heating operation to outdoor unit heat exchanger.

Such as according to one embodiment of present invention, the process that described outdoor unit heat exchanger heats is comprised: the refrigerant flowing into described outdoor unit heat exchanger is heated.

According to antifrost method of the present invention, such as restricting element (as capillary, electric expansion valve, heating power expansion valve etc.) in air-conditioning equipment and the pipeline between outdoor unit heat exchanger can arrange refrigerant heater, realize the heating operation that convection current enters the refrigerant of outdoor unit heat exchanger.Direct-fired above-mentioned electric heater unit is carried out compared to outdoor unit heat exchanger, refrigerant heater and other equipment or device relatively independent, no matter be then in installation or maintenance process, can both reduce as much as possible and the associating of other equipment or device, lower and install and maintenance difficulty, increase ease for use.

According to one embodiment of present invention, also comprise: obtain outdoor humidity information; If outside humidity higher than the humidity threshold preset, then allows to heat described outdoor unit heat exchanger.

According to antifrost method of the present invention, when the humidity of outdoor environment is lower, by means of only the heat exchange amount reducing outdoor unit heat exchanger, frosting risk can be eliminated at short notice, recover indoor heating; And when the humidity of outdoor environment is higher, if only reduce the heat exchange amount of outdoor unit heat exchanger, its temperature recovery speed is slower, may cannot recover the heat supply to indoor in a long time, thus the heating to outdoor unit heat exchanger is combined, contribute to shortening the processing time, reduce the impact of the comfort level on indoor.

Embodiment according to a second aspect of the present invention, proposes a kind of antifrost device of air-conditioning equipment, comprising: acquiring unit, for obtaining the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Judging unit, for judging whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; Processing unit, for when it is determined that the presence of frosting risk, by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk.

Antifrost device according to an embodiment of the invention, the frost of outdoor unit heat exchanger, first needs to form condensation on outdoor unit heat exchanger surface; Further, if external environment temperature is lower, condensation is frozen, will frost layer be formed.In a kind of situation, after outdoor unit heat exchanger surface forms condensation, if environment temperature is lower, in the possible short time, will frost layer be formed, thus there is frosting risk; In another kind of situation, if current environmental temperature is higher, condensation temporarily can not form frost layer, if but after a period of time, when environment temperature declines, still there is condensation, then still there is frosting risk.

According to one embodiment of present invention, described judging unit is used for: when described evaporating temperature meets first condition, it is determined that the presence of frosting risk; Wherein, described first condition comprises: be less than or equal to early warning temperature, and wherein, described early warning temperature equals described dew-point temperature or exceed preset temperature than described dew-point temperature poor.

According to another embodiment of the invention, described judging unit also for: when described evaporating temperature meets described first condition and second condition simultaneously, it is determined that the presence of frosting risk; Wherein, described second condition comprises: be less than or equal to freezing point temperature.

According to antifrost device of the present invention, " frosting risk " refers to the generation that may cause frost, if but ambient temperature is higher time, then currently only may can generate condensation, and temporarily can not form frost layer.Therefore, by comparing further evaporating temperature, can determine the current risk that whether there is formation frost layer, the temperature if evaporating temperature is below the freezing point, just determines to there is frosting risk, makes judged result have more reference value in current slot.In this embodiment, for the elimination of frosting risk, can make evaporating temperature higher than condensation temperature the temperature that is below the freezing point, also can higher than freezing point temperature lower than condensation temperature, can also simultaneously higher than condensation temperature and freezing point temperature.

According to one embodiment of present invention, described acquiring unit comprises multiple concrete functional structure: (1) gathers subelement and computation subunit; Or (2) pre-stored subelement and inquiry subelement, wherein:

For structure (1), concrete obtain manner can be: described collection subelement is for gathering outdoor ambient temperature information and humidity information, and described computation subunit is used for utilizing described ambient temperature information and described humidity information, calculates described dew-point temperature according to preset formula.

For structure (2), concrete obtain manner can be: 1) described pre-stored subelement is used for setting up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor, and described inquiry subelement is used for from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature; Or 2) described pre-stored subelement be used in advance set up and memory time information and the dew-point temperature of outdoor between the second relation table, and described inquiry subelement be used for from described second relation table, search the dew-point temperature corresponding with current time.

For structure (1), by real-time temperature acquisition and calculating, contribute to improving the precision of Temperature numerical and the accuracy of judgement.For structure (2), in mode 1) in, adopt the mode of the first relation table set up in advance, combine the collection in real time to dry-bulb temperature and wet-bulb temperature, while reducing real-time amount of calculation compared to structure (1), also can guarantee the accuracy of judgement; In mode 2) in, because the temperature and humidity situation of each area in certain hour section has certain regularity, such as north of china in winter temperature is relatively low, comparatively dry, south winter temperature is relatively high, comparatively moist, thus can for the dew-point temperature of different geographical in different time sections, set up the second relation table, thus while reducing amount of calculation further, ensure that the accuracy of dew-point temperature to a certain extent.Wherein, it is one or more that temporal information can comprise in morning and evening in season, month, one day, current residing time interval etc., and more temporal information contributes to the accuracy improving dew-point temperature.

According to one embodiment of present invention, when described air-conditioning equipment is configured with frequency-changeable compressor, described processing unit is used for: perform down conversion process to described frequency-changeable compressor; When described air-conditioning equipment is configured with invariable frequency compressor, described processing unit is used for: perform hesitation process to described invariable frequency compressor.

According to antifrost device of the present invention, for frequency-changeable compressor, the mode of frequency reducing can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, thus the frosting risk of outdoor unit heat exchanger can be eliminated on the one hand, the impact of the comfortableness on indoor can be avoided on the other hand as far as possible.For invariable frequency compressor, the mode of hesitation can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, although the heat supply to indoor can be suspended, obtain heat indoor compared in defrost process, still relatively less on the impact of indoor; Meanwhile, owing to just there is frosting risk, processing procedure is obviously more prone to than elimination frost layer and easily, thus down time ratio defrosting time is relatively shorter, also relatively less on the impact being interior survey.

According to one embodiment of present invention, described processing unit is used for: the operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency, or progressively reduces the operating frequency of described frequency-changeable compressor according to preset ratio.

According to antifrost device of the present invention, to the frequency reducing process of frequency-changeable compressor, also different processing modes can be adopted, as by directly operating frequency being down to predeterminated frequency, then contribute to shortening the processing time to frosting risk, or by progressively operating frequency being down to predeterminated frequency, then making to gradually reduce the heating load of indoor, contributing to reducing the impact on indoor.Wherein, predeterminated frequency can be certain the concrete frequency values pre-set, and also can be the relative changing value relative to different ongoing frequency, such as reduce 80% of ongoing frequency, or both all have, therefrom select according to user's actual needs.

According to one embodiment of present invention, described processing unit also for: when it is determined that the presence of frosting risk, described outdoor unit heat exchanger is heated.

According to antifrost device of the present invention, for being configured with the air-conditioning equipment determining frequency or frequency-changeable compressor, all can heat outdoor unit heat exchanger.Wherein, the mode heated exists a variety of, in such as a kind of situation, can by machine heat exchanger disposed in the outdoor inner or outside as electric heater unit, directly outdoor unit heat exchanger is heated, in another kind of situation, also can adopt the mode that other parts are heated, indirectly realize the heating operation to outdoor unit heat exchanger.

Such as according to one embodiment of present invention, described processing unit specifically for: heat flowing into the refrigerant of described outdoor unit heat exchanger.

According to antifrost device of the present invention, such as restricting element in air-conditioning equipment and the pipeline between outdoor unit heat exchanger can arrange refrigerant heater, realize the heating operation that convection current enters the refrigerant of outdoor unit heat exchanger.Direct-fired above-mentioned electric heater unit is carried out compared to outdoor unit heat exchanger, refrigerant heater and other equipment or device relatively independent, no matter be then in installation or maintenance process, can both reduce as much as possible and the associating of other equipment or device, lower and install and maintenance difficulty, increase ease for use.

According to one embodiment of present invention, described acquiring unit also for: obtain outdoor humidity information; And the antifrost device of described air-conditioning equipment also comprises: control unit, for when outside humidity is higher than the humidity threshold preset, described processing unit is allowed to heat described outdoor unit heat exchanger.

According to antifrost device of the present invention, when the humidity of outdoor environment is lower, by means of only the heat exchange amount reducing outdoor unit heat exchanger, frosting risk can be eliminated at short notice, recover indoor heating; And when the humidity of outdoor environment is higher, if only reduce the heat exchange amount of outdoor unit heat exchanger, its temperature recovery speed is slower, may cannot recover the heat supply to indoor in a long time, thus the heating to outdoor unit heat exchanger is combined, contribute to shortening the processing time, reduce the impact of the comfort level on indoor.

Embodiment according to a third aspect of the present invention, proposes a kind of air-conditioning equipment, comprises the antifrost device of the air-conditioning equipment according to any one of technique scheme.

By above technical scheme, can Timeliness coverage effectively eliminate the frosting risk of the outdoor unit heat exchanger of air-conditioning equipment, the generation of prevention frost, avoids defrost process to make troubles to user, contributes to the experience promoting user.

Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 shows the schematic block diagram of the antifrost device of air-conditioning equipment according to an embodiment of the invention;

Fig. 2 A is the schematic block diagram of the acquiring unit under a kind of embodiment embodiment illustrated in fig. 1;

Fig. 2 B is the schematic block diagram of the acquiring unit under another kind of embodiment embodiment illustrated in fig. 1;

Fig. 3 shows the structural representation of air-conditioning equipment according to an embodiment of the invention;

Fig. 4 is the schematic diagram of the execution step of antifrost function embodiment illustrated in fig. 1;

Fig. 5 shows the schematic block diagram of air-conditioning equipment according to an embodiment of the invention;

Fig. 6 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to an embodiment of the invention;

Fig. 7 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to another embodiment of the invention;

Fig. 8 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to still another embodiment of the invention;

Fig. 9 A shows the schematic flow diagram judging whether to exist frosting risk according to an embodiment of the invention;

Fig. 9 B shows the schematic flow diagram judging whether to exist frosting risk according to another embodiment of the invention;

Figure 10 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention;

Figure 11 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to another embodiment of the invention;

Figure 12 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to still another embodiment of the invention;

Figure 13 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to still another embodiment of the invention.

Detailed description of the invention

In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.

Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not limited to the restriction of following public specific embodiment.

Fig. 1 shows the schematic block diagram of the antifrost device of air-conditioning equipment according to an embodiment of the invention.

As shown in Figure 1, the antifrost device 100 of air-conditioning equipment according to an embodiment of the invention, comprising: acquiring unit 102, for obtaining the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Judging unit 104, for judging whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; Processing unit 106, for when it is determined that the presence of frosting risk, by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk.

Antifrost device 100 according to an embodiment of the invention, the frost of outdoor unit heat exchanger, first needs to form condensation on outdoor unit heat exchanger surface; Further, if external environment temperature is lower, condensation is frozen, will frost layer be formed.In a kind of situation, after outdoor unit heat exchanger surface forms condensation, if environment temperature is lower, in the possible short time, will frost layer be formed, thus there is frosting risk; In another kind of situation, if current environmental temperature is higher, condensation temporarily can not form frost layer, if but after a period of time, when environment temperature declines, still there is condensation, then still there is frosting risk.

1, judging unit 104

Judgment mode for judging unit 104 pairs of frosting risks has a lot, is described below for kind of the concrete embodiment of two wherein.

Embodiment one

Judging unit 104, when described evaporating temperature meets first condition, it is determined that the presence of frosting risk; Wherein, described first condition comprises: be less than or equal to early warning temperature, and wherein, described early warning temperature equals described dew-point temperature or exceed preset temperature than described dew-point temperature poor.

Due to when evaporating temperature is less than dew-point temperature, the moisture in air will form condensation on outdoor unit heat exchanger surface, thus according to the antifrost method of the embodiment of the present invention, evaporating temperature should be made to be increased to and be greater than dew-point temperature, to eliminate frosting risk.Particularly, two kinds of concrete conditions are wherein comprised again:

In one case, directly can judging the size of evaporating temperature and dew-point temperature, making when detecting that evaporating temperature is less than or equal to dew-point temperature, evaporating temperature can be improved in time, avoid producing condensation as far as possible, thus frosting risk can be eliminated.

Embodiment two

Judging unit 104, when described evaporating temperature meets described first condition and second condition simultaneously, it is determined that the presence of frosting risk; Wherein, first condition and the condition described in above-mentioned embodiment one, described second condition comprises: be less than or equal to freezing point temperature.

According to antifrost device 100 of the present invention, " frosting risk " refers to the generation that may cause frost, if but ambient temperature is higher time, then currently only may can generate condensation, and temporarily can not form frost layer.Therefore, by comparing further evaporating temperature, can determine the current risk that whether there is formation frost layer, the temperature if evaporating temperature is below the freezing point, just determines to there is frosting risk, makes judged result have more reference value in current slot.In this embodiment, for the elimination of frosting risk, can make evaporating temperature higher than condensation temperature the temperature that is below the freezing point, also can higher than freezing point temperature lower than condensation temperature, can also simultaneously higher than condensation temperature and freezing point temperature.

2, acquiring unit 102

According to embodiments of the invention, acquiring unit 102 can adopt multiple different mode, to realize the acquisition to dew-point temperature, below with wherein two kinds of concrete functional structures, describe the multiple obtain manner to dew-point temperature in detail, wherein, Fig. 2 A is the schematic block diagram of the acquiring unit 102 under a kind of embodiment embodiment illustrated in fig. 1; Fig. 2 B is the schematic block diagram of the acquiring unit 102 under another kind of embodiment embodiment illustrated in fig. 1.

Embodiment one

As shown in Figure 2 A, acquiring unit 102 comprises: gather subelement 102A and computation subunit 102B.For this structure, then the obtain manner (1) of dew-point temperature is comprised:

Described collection subelement 102A is for gathering outdoor ambient temperature information and humidity information, and described computation subunit 102B is used for utilizing described ambient temperature information and described humidity information, calculates described dew-point temperature according to preset formula.

In obtain manner (1), by real-time temperature acquisition and calculating, contribute to improving the precision of Temperature numerical and the accuracy of judgement.Wherein, can there is various ways for the preset formula calculating dew-point temperature, such as a kind of concrete form can be:

X1=In(RH1)+17.62×T1/(243.12+T1)；

Tdp=X1×243.12/(17.62-X1)；

Wherein, RH1 represents current environment relative humidity, and T1 represents current environment Celsius temperature, and X1 is the intermediate variable calculated, and Tdp represents the dew-point temperature of current environment.

Embodiment two

As shown in Figure 2 B, acquiring unit 102 comprises: pre-stored subelement 102C and inquiry subelement 102D.For this structure, then the obtain manner of dew-point temperature is comprised:

Obtain manner (2): described pre-stored subelement 102C is used for setting up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor, and described inquiry subelement 102D is used for searching the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature from described first relation table.

In obtain manner (2), adopt the mode of the first relation table set up in advance, combine the collection in real time to dry-bulb temperature and wet-bulb temperature, while reducing real-time amount of calculation compared to obtain manner (1), also can guarantee the accuracy of judgement.

Obtain manner (3): described pre-stored subelement 102C be used in advance set up and memory time information and the dew-point temperature of outdoor between the second relation table, and described inquiry subelement 102D be used for from described second relation table, search the dew-point temperature corresponding with current time.

In obtain manner (3), because the temperature and humidity situation of each area in certain hour section has certain regularity, such as north of china in winter temperature is relatively low, comparatively dry, south winter temperature is relatively high, comparatively moist, thus can for the dew-point temperature of different geographical in different time sections, set up the second relation table, thus while reducing amount of calculation further, ensure that the accuracy of dew-point temperature to a certain extent.Wherein, it is one or more that temporal information can comprise in morning and evening in season, month, one day, current residing time interval etc., and more temporal information contributes to the accuracy improving dew-point temperature.

3, processing unit 106

Embodiment one

According to embodiments of the invention, mention above: processing unit 106 by reducing the heat exchange amount of outdoor unit heat exchanger, thus solves frosting risk.Such as Fig. 3 shows the structural representation of air-conditioning equipment according to an embodiment of the invention, when there is frosting risk, by the FREQUENCY CONTROL to compressor 3, can realize regulating the temperature of outdoor unit heat exchanger 1, avoid condensation and frosting, and reduce the impact on indoor set heat exchanger 2 as much as possible.

Wherein, when described air-conditioning equipment is configured with frequency-changeable compressor, described processing unit 106 for: down conversion process is performed to described frequency-changeable compressor; When described air-conditioning equipment is configured with invariable frequency compressor, described processing unit 106 for: hesitation process is performed to described invariable frequency compressor.

According to antifrost device 100 of the present invention, for frequency-changeable compressor, the mode of frequency reducing can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, thus the frosting risk of outdoor unit heat exchanger can be eliminated on the one hand, the impact of the comfortableness on indoor can be avoided on the other hand as far as possible.For invariable frequency compressor, the mode of hesitation can be adopted to reduce the heat exchange amount of outdoor unit heat exchanger, although the heat supply to indoor can be suspended, obtain heat indoor compared in defrost process, still relatively less on the impact of indoor; Meanwhile, owing to just there is frosting risk, processing procedure is obviously more prone to than elimination frost layer and easily, thus down time ratio defrosting time is relatively shorter, also relatively less on the impact being interior survey.

For frequency-changeable compressor, although be all perform frequency reducing operation, but can various ways be adopted for the adjustment of the operating frequency of compressor, such as the operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency by processing unit 106, or progressively reduces the operating frequency of described frequency-changeable compressor according to preset ratio.

Wherein, by directly operating frequency being down to predeterminated frequency, then contribute to shortening the processing time to frosting risk, or by progressively operating frequency being down to predeterminated frequency, then make to gradually reduce the heating load of indoor, contribute to reducing the impact on indoor.Wherein, predeterminated frequency can be certain the concrete frequency values pre-set, and also can be the relative changing value relative to different ongoing frequency, such as reduce 80% of ongoing frequency, or both all have, therefrom select according to user's actual needs.

Embodiment two

According to one embodiment of present invention, described processing unit 106 also for: when it is determined that the presence of frosting risk, described outdoor unit heat exchanger is heated.

According to antifrost device 100 of the present invention, for being configured with the air-conditioning equipment determining frequency or frequency-changeable compressor, all can heat outdoor unit heat exchanger.Wherein, the mode heated exists a variety of, in such as a kind of situation, can by machine heat exchanger disposed in the outdoor inner or outside as electric heater unit, directly outdoor unit heat exchanger is heated, in another kind of situation, also can adopt the mode that other parts are heated, indirectly realize the heating operation to outdoor unit heat exchanger.

Such as according to one embodiment of present invention, described processing unit 106 specifically for: heat flowing into the refrigerant of described outdoor unit heat exchanger.

Particularly, such as Fig. 3 shows the structural representation of air-conditioning equipment according to an embodiment of the invention, wherein, the restricting element 5 in air-conditioning equipment and the pipeline between outdoor unit heat exchanger 1 arrange refrigerant heater 4, realizes the heating operation that convection current enters the refrigerant of outdoor unit heat exchanger 1.Direct-fired above-mentioned electric heater unit (not shown) is carried out compared to outdoor unit heat exchanger 1, refrigerant heater 4 and other equipment or device relatively independent, no matter be then in installation or maintenance process, can both reduce as much as possible and the associating of other equipment or device, lower and install and maintenance difficulty, increase ease for use.

In the construction shown in fig. 1, for the different embodiments of above-mentioned reduction heat exchange amount and heating, wherein, reduce heat exchange amount be applicable to the humidity of outdoor environment lower when, by means of only the heat exchange amount reducing outdoor unit heat exchanger, frosting risk can be eliminated at short notice, recover indoor heating; And when the humidity of outdoor environment is higher, if only reduce the heat exchange amount of outdoor unit heat exchanger, its temperature recovery speed is comparatively slow, the heat supply to indoor may cannot be recovered in a long time.

Therefore, acquiring unit 102 also for: obtain outdoor humidity information; And the antifrost device 100 of described air-conditioning equipment also comprises: control unit 108, for when outside humidity is higher than the humidity threshold preset, described processing unit 106 is allowed to heat described outdoor unit heat exchanger.In the program, by combining the heating to outdoor unit heat exchanger, contributing to shortening the processing time, reducing the impact of the comfort level on indoor.

Based on shown in Fig. 1 the structure of antifrost device, Fig. 4 shows the schematic diagram of the execution step of corresponding antifrost function.

As shown in Figure 4, the execution step of concrete antifrost function comprises:

Step 402, starts the heat-production functions of air-conditioning equipment.

Step 404, acquiring unit 102 obtains required temperature parameter numerical value, comprises the evaporating temperature as outdoor unit heat exchanger and outdoor dew-point temperature.

Step 406, main control module determines whether there is frosting risk, and execution processes operation accordingly.

Wherein, main control module and the judge module shown in Fig. 1 104 and processing module 106, by evaporating temperature and dew-point temperature being compared, or also compare evaporating temperature and freezing point temperature simultaneously, to determine currently whether there is frosting risk; If there is frosting risk, then perform step 408A and/or step 408B.

Step 408A, by carrying out down conversion process to frequency-changeable compressor, or carries out hesitation process to invariable frequency compressor, thus reduces the heat exchange amount of outdoor unit heat exchanger, helps its temperature of ging up as early as possible, eliminates frosting risk.

Step 408B, by heating the refrigerant that will flow into outdoor unit heat exchanger, making the refrigerant after heating when Liu Jing outdoor unit heat exchanger, heating, thus improve evaporating temperature, eliminate frosting risk to it.

Wherein, step 408A and step 408B, only can use any one processing mode wherein, also can use simultaneously.Such as by detecting the humidity of current outdoor environment, if humidity is higher than default humidity threshold, then can use step 408B, or using step 408A and step 408B simultaneously, otherwise using step 408A.

Fig. 5 shows the schematic block diagram of air-conditioning equipment according to an embodiment of the invention.

As shown in Figure 5, air-conditioning equipment 500 according to an embodiment of the invention, comprises the antifrost device 100 of air-conditioning equipment as shown in Figure 1, and has above-mentioned relevant all processing capacities, and can realize corresponding beneficial effect.

Below in conjunction with Fig. 6 to Figure 13, the antifrost method of air-conditioning equipment of the present invention is described in detail.

Embodiment one

Fig. 6 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to an embodiment of the invention.

As shown in Figure 6, the antifrost method of air-conditioning equipment according to an embodiment of the invention comprises:

Step 602, obtains the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Step 604, judges whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; Step 606, if it is determined that the presence of frosting risk, then by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk.

As the embodiment of the heat exchange amount of concrete reduction outdoor unit heat exchanger, the present invention proposes:

When described air-conditioning equipment is configured with frequency-changeable compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform down conversion process to described frequency-changeable compressor; When described air-conditioning equipment is configured with invariable frequency compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform hesitation process to described invariable frequency compressor.

More specifically, the process of described frequency-changeable compressor execution down conversion process is comprised: the operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency; Or the operating frequency of described frequency-changeable compressor is progressively reduced according to preset ratio.

Certainly, except reducing the heat exchange amount of outdoor unit heat exchanger, other processing mode can also be adopted.

Embodiment two

Fig. 7 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to another embodiment of the invention.

As shown in Figure 7, the antifrost method of air-conditioning equipment according to another embodiment of the invention, comprising:

Step 702, obtains the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Step 704, judges whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; Step 706, if it is determined that the presence of frosting risk, then by heating described outdoor unit heat exchanger, to eliminate described frosting risk.

Compared to the embodiment shown in Fig. 6, this programme, by " heating described outdoor unit heat exchanger ", substituted for the processing mode of " the reducing the heat exchange amount of described outdoor unit heat exchanger " in embodiment one.

Particularly, according to antifrost method of the present invention, for being configured with the air-conditioning equipment determining frequency or frequency-changeable compressor, all can heat outdoor unit heat exchanger.Wherein, the mode heated exists a variety of, in such as a kind of situation, can by machine heat exchanger disposed in the outdoor inner or outside as electric heater unit, directly outdoor unit heat exchanger is heated, in another kind of situation, also can adopt the mode that other parts are heated, indirectly realize the heating operation to outdoor unit heat exchanger.

According to antifrost method of the present invention, such as restricting element in air-conditioning equipment and the pipeline between outdoor unit heat exchanger can arrange refrigerant heater, realize the heating operation that convection current enters the refrigerant of outdoor unit heat exchanger.Direct-fired above-mentioned electric heater unit is carried out compared to outdoor unit heat exchanger, refrigerant heater and other equipment or device relatively independent, no matter be then in installation or maintenance process, can both reduce as much as possible and the associating of other equipment or device, lower and install and maintenance difficulty, increase ease for use.

Certainly, for the processing mode that Fig. 6 and Fig. 7 proposes respectively, also can be integrated in same air-conditioning equipment, then concrete embodiment is as follows simultaneously.

Embodiment three

Fig. 8 shows the schematic flow diagram of the antifrost method of air-conditioning equipment according to still another embodiment of the invention.

As shown in Figure 8, the antifrost method of air-conditioning equipment according to still another embodiment of the invention, comprising:

Step 802, obtains the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature; Step 804, judges whether to there is frosting risk according to described evaporating temperature and described dew-point temperature; Step 806, if it is determined that the presence of frosting risk, then reduces the heat exchange amount of described outdoor unit heat exchanger, and heats described outdoor unit heat exchanger, to eliminate described frosting risk.

The program is integrated with the processing mode of the elimination frosting risk proposed respectively in embodiment one and embodiment two simultaneously, but also can determine concrete executive mode according to actual conditions, such as:

Obtain outdoor humidity information; If outside humidity higher than the humidity threshold preset, then allows to heat described outdoor unit heat exchanger.

In embodiment one to three shown in Fig. 6 to Fig. 8, also relate to the judgement for whether there is frosting risk, be described in detail below in conjunction with Fig. 9 A and Fig. 9 B, wherein, Fig. 9 A shows the schematic flow diagram judging whether to exist frosting risk according to an embodiment of the invention; Fig. 9 B shows the schematic flow diagram judging whether to exist frosting risk according to another embodiment of the invention.

Embodiment one

As shown in Figure 9 A, according to an embodiment of the inventionly judge whether that the exemplary flow that there is frosting risk comprises:

Step 902A, judges whether described evaporating temperature meets first condition: be less than or equal to early warning temperature, and wherein, described early warning temperature equals described dew-point temperature or exceed preset temperature than described dew-point temperature poor; Step 904A, if meet described first condition, then it is determined that the presence of frosting risk.

Due to when evaporating temperature is less than dew-point temperature, the moisture in air will form condensation on outdoor unit heat exchanger surface, thus according to the antifrost method of the embodiment of the present invention, evaporating temperature should be made to be increased to and be greater than dew-point temperature, to eliminate frosting risk.Wherein, two kinds of different situations are specifically comprised:

Embodiment two

As shown in Figure 9 B, according to another embodiment of the invention judge whether that the exemplary flow that there is frosting risk comprises:

Step 902B, judges whether described evaporating temperature meets above-mentioned first condition and second condition: be less than or equal to freezing point temperature; Step 904B, if meet described first condition and described second condition simultaneously, then it is determined that the presence of frosting risk.

In embodiment one to embodiment three shown in Fig. 6 to Fig. 8, also relate to the acquisition for dew-point temperature, be described in detail for multiple concrete obtain manner wherein below:

(1) utilize ambient temperature information and the humidity information of the outdoor collected, calculate described dew-point temperature according to preset formula.

X1=In(RH1)+17.62×T1/(243.12+T1)；

Tdp=X1×243.12/(17.62-X1)；

(2) to set up in advance and dry-bulb temperature, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor outside locker room, and from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature.

(3) set up in advance and memory time information and the dew-point temperature of outdoor between the second relation table, and from described second relation table, search the dew-point temperature corresponding with current time.

Below in conjunction with Figure 10 to Figure 13, the functional steps for several concrete air-conditioning equipment antifrost is described in detail, and wherein, Figure 10 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention; Figure 11 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to another embodiment of the invention; Figure 12 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to still another embodiment of the invention; Figure 13 shows the schematic flow diagram of the functional steps of air-conditioning equipment antifrost according to still another embodiment of the invention.

Embodiment one

As shown in Figure 10, the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention comprises:

Step 1002, opens the heating mode of air-conditioning equipment.

Step 1004, obtains outdoor dry-bulb temperature T1, wet-bulb temperature T2, and the outdoor unit heat exchanger evaporating temperature T3 of air-conditioning equipment.

Step 1006, according to dry-bulb temperature T1, wet-bulb temperature T2, calculates outdoor dew-point temperature Tdp.Based on the humidity and temperature of outdoor environment, default formulae discovery can be used to go out corresponding dew-point temperature, and such as a kind of concrete form can be:

X1=In(RH1)+17.62×T1/(243.12+T1)；

Tdp=X1×243.12/(17.62-X1)；

Wherein, RH1 represents current environment relative humidity (can be determined by wet-bulb temperature T2), and T1 represents current environment Celsius temperature (i.e. dry-bulb temperature T1), and X1 is the intermediate variable calculated, and Tdp represents the dew-point temperature of current environment.

Step 1008, judges whether the evaporating temperature T3 of the outdoor unit heat exchanger got is less than or equal to 0 degree (degree Celsius/DEG C), and is less than or equal to dew-point temperature, if so, then enter step 1010, otherwise terminate.Wherein, in fact temperature 0 degree refers to freezing point temperature, according to the difference of actual conditions, can adjust accordingly 0 herein degree.

Step 1010, reduces the heat exchange amount of outdoor unit heat exchanger, such as particularly, can by reducing the frequency of frequency-changeable compressor, or the mode of invariable frequency compressor break-off be realized.

After step 1010, return step 1008, continue the relative size relation judged between evaporating temperature T3 and 0 degree and dew-point temperature Tdp.

Embodiment two

As shown in figure 11, the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention comprises:

Step 1102, opens the heating mode of air-conditioning equipment.

Step 1104, obtains current time information, and the outdoor unit heat exchanger evaporating temperature T3 of air-conditioning equipment.

Step 1106, the dew-point temperature Tdp that inquiry is outdoor.

Be different from the step 1006 shown in Figure 10, can set up in advance herein and memory time information and the dew-point temperature of outdoor between the second relation table, and from described second relation table, search the dew-point temperature corresponding with current time.

Because the temperature and humidity situation of each area in certain hour section has certain regularity, such as north of china in winter temperature is relatively low, comparatively dry, south winter temperature is relatively high, comparatively moist, thus can for the dew-point temperature of different geographical in different time sections, set up the second relation table, thus while reducing amount of calculation further, ensure that the accuracy of dew-point temperature to a certain extent.Wherein, it is one or more that temporal information can comprise in morning and evening in season, month, one day, current residing time interval etc., and more temporal information contributes to the accuracy improving dew-point temperature.

Step 1108, judges whether the evaporating temperature T3 of the outdoor unit heat exchanger got is less than or equal to 0 degree (degree Celsius/DEG C), and is less than or equal to dew-point temperature, if so, then enter step 1010, otherwise terminate.Wherein, in fact temperature 0 degree refers to freezing point temperature, according to the difference of actual conditions, can adjust accordingly 0 herein degree.

Step 1110, heats outdoor unit heat exchanger, such as particularly, by heating the refrigerant that will flow into outdoor unit heat exchanger, refrigerant can being made when flowing through outdoor unit heat exchanger, heating it.Particularly, between the throttling arrangement of air-conditioning equipment and outdoor unit heat exchanger, refrigerant heater can be set, thus realize the heating to refrigerant.

After step 1110, return step 1108, continue the relative size relation judged between evaporating temperature T3 and 0 degree and dew-point temperature Tdp.

Embodiment three

As shown in figure 12, the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention comprises:

Step 1202, opens the heating mode of air-conditioning equipment.

Step 1204, obtains outdoor dry-bulb temperature T1, wet-bulb temperature T2, and the outdoor unit heat exchanger evaporating temperature T3 of air-conditioning equipment.

Step 1206, the dew-point temperature Tdp that inquiry is outdoor.

Be different from the step 1106 shown in the step 1006 shown in Figure 10 and Figure 11, can set up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor herein, and from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature.

By adopting the mode setting up the first relation table in advance, in conjunction with in real time to the collection of dry-bulb temperature and wet-bulb temperature, then compared to step 1006 as shown in Figure 10, reduce real-time amount of calculation, and the accuracy that judges can be guaranteed.

Step 1208, judges whether the evaporating temperature T3 of the outdoor unit heat exchanger got is less than or equal to 0 degree (degree Celsius/DEG C), and is less than or equal to dew-point temperature, if so, then enter step 1210, otherwise terminate.Wherein, in fact temperature 0 degree refers to freezing point temperature, according to the difference of actual conditions, can adjust accordingly 0 herein degree.

Step 1210, judges whether outdoor ambient humidity is greater than default humidity threshold.Particularly, can pass through to judge whether outdoor wet-bulb temperature T2 is more than or equal to wet-bulb temperature threshold value Tc, if not, then enter step 1212A, if so, then enter step 1212B.

Step 1212A, reduces the heat exchange amount of outdoor unit heat exchanger, such as particularly, can by reducing the frequency of frequency-changeable compressor, or the mode of invariable frequency compressor break-off be realized.

Step 1212B, heats outdoor unit heat exchanger, such as particularly, by heating the refrigerant that will flow into outdoor unit heat exchanger, refrigerant can being made when flowing through outdoor unit heat exchanger, heating it.Particularly, between the throttling arrangement of air-conditioning equipment and outdoor unit heat exchanger, refrigerant heater can be set, thus realize the heating to refrigerant.

After step 1212A or step 1212B, return step 1208, continue the relative size relation judged between evaporating temperature T3 and 0 degree and dew-point temperature Tdp.

Embodiment four

As shown in figure 13, the functional steps of air-conditioning equipment antifrost according to an embodiment of the invention comprises:

Step 1302, opens the heating mode of air-conditioning equipment.

Step 1304, obtains outdoor dry-bulb temperature T1, wet-bulb temperature T2, and the outdoor unit heat exchanger evaporating temperature T3 of air-conditioning equipment.

Step 1306, the dew-point temperature Tdp that inquiry is outdoor.

Step 1308, judges whether the evaporating temperature T3 of the outdoor unit heat exchanger got is less than or equal to 0 degree (degree Celsius/DEG C), and is less than or equal to dew-point temperature, if so, then enter step 1310 and step 1312, otherwise terminate.Wherein, in fact temperature 0 degree refers to freezing point temperature, according to the difference of actual conditions, can adjust accordingly 0 herein degree.

Step 1310, reduces the heat exchange amount of outdoor unit heat exchanger, such as particularly, can by reducing the frequency of frequency-changeable compressor, or the mode of invariable frequency compressor break-off be realized.

Step 1312, judges whether outdoor ambient humidity is greater than default humidity threshold.Particularly, by judging whether outdoor wet-bulb temperature T2 is more than or equal to wet-bulb temperature threshold value Tc, if so, then enters step 1314, otherwise can terminate.

Step 1314, heats outdoor unit heat exchanger, such as particularly, by heating the refrigerant that will flow into outdoor unit heat exchanger, refrigerant can being made when flowing through outdoor unit heat exchanger, heating it.Particularly, between the throttling arrangement of air-conditioning equipment and outdoor unit heat exchanger, refrigerant heater can be set, thus realize the heating to refrigerant.

Wherein, after step 1310 and step 1314, return step 1308, continue the relative size relation judged between evaporating temperature T3 and 0 degree and dew-point temperature Tdp.

More than be described with reference to the accompanying drawings technical scheme of the present invention, consider in correlation technique, only after generation frost, just avoid the service behaviour of outdoor unit heat exchanger to be affected by defrost operation, but defrost process needs heat in absorption chamber, affect the comfortableness of indoor.Therefore, the present invention proposes a kind of antifrost method and antifrost device of air-conditioning equipment, and a kind of air-conditioning equipment, can Timeliness coverage effectively eliminate the frosting risk of the outdoor unit heat exchanger of air-conditioning equipment, the generation of prevention frost, avoid defrost process to make troubles to user, contribute to the experience promoting user.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.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

1. an antifrost method for air-conditioning equipment, is characterized in that, comprising:

Obtain the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature;

Judge whether to there is frosting risk according to described evaporating temperature and described dew-point temperature;

If it is determined that the presence of frosting risk, then by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk;

Wherein, when described air-conditioning equipment is configured with frequency-changeable compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform down conversion process to described frequency-changeable compressor;

When described air-conditioning equipment is configured with invariable frequency compressor, the process of the heat exchange amount of the described outdoor unit heat exchanger of described reduction comprises: perform hesitation process to described invariable frequency compressor.

2. the antifrost method of air-conditioning equipment according to claim 1, is characterized in that, described in judge whether that the process that there is frosting risk comprises:

Judge whether described evaporating temperature meets first condition: be less than or equal to early warning temperature, wherein, described early warning temperature equals described dew-point temperature or exceeds preset temperature than described dew-point temperature poor;

If meet described first condition, then it is determined that the presence of frosting risk.

3. the antifrost method of air-conditioning equipment according to claim 2, is characterized in that, described in judge whether that the process that there is frosting risk also comprises:

Judge whether described evaporating temperature meets second condition: be less than or equal to freezing point temperature;

If meet described first condition and described second condition simultaneously, then it is determined that the presence of frosting risk.

4. the antifrost method of air-conditioning equipment according to claim 1, is characterized in that, the process obtaining described dew-point temperature comprises:

Utilize ambient temperature information and the humidity information of the outdoor collected, calculate described dew-point temperature according to preset formula;

Or set up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor, and from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature;

Or set up in advance and memory time information and the dew-point temperature of outdoor between the second relation table, and from described second relation table, search the dew-point temperature corresponding with current time.

5. the antifrost method of air-conditioning equipment according to claim 1, is characterized in that, the process described frequency-changeable compressor being performed to down conversion process comprises:

The operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency;

Or the operating frequency of described frequency-changeable compressor is progressively reduced according to preset ratio.

6. the antifrost method of air-conditioning equipment according to any one of claim 1 to 5, is characterized in that, if it is determined that the presence of frosting risk, then described antifrost method also comprises:

Described outdoor unit heat exchanger is heated.

7. the antifrost method of air-conditioning equipment according to claim 6, is characterized in that, comprises the process that described outdoor unit heat exchanger heats:

The refrigerant flowing into described outdoor unit heat exchanger is heated.

8. the antifrost method of air-conditioning equipment according to claim 6, is characterized in that, also comprise:

Obtain outdoor humidity information;

If outside humidity higher than the humidity threshold preset, then allows to heat described outdoor unit heat exchanger.

9. an antifrost device for air-conditioning equipment, is characterized in that, comprising:

Acquiring unit, for obtaining the evaporating temperature of the outdoor unit heat exchanger of described air-conditioning equipment and outdoor dew-point temperature;

Judging unit, for judging whether to there is frosting risk according to described evaporating temperature and described dew-point temperature;

Processing unit, for when it is determined that the presence of frosting risk, by reducing the heat exchange amount of described outdoor unit heat exchanger, to eliminate described frosting risk;

Wherein, when described air-conditioning equipment is configured with frequency-changeable compressor, described processing unit is used for: perform down conversion process to described frequency-changeable compressor;

When described air-conditioning equipment is configured with invariable frequency compressor, described processing unit is used for: perform hesitation process to described invariable frequency compressor.

10. the antifrost device of air-conditioning equipment according to claim 9, is characterized in that, described judging unit is used for: when described evaporating temperature meets first condition, it is determined that the presence of frosting risk;

Wherein, described first condition comprises: be less than or equal to early warning temperature, and wherein, described early warning temperature equals described dew-point temperature or exceed preset temperature than described dew-point temperature poor.

The antifrost device of 11. air-conditioning equipments according to claim 10, is characterized in that, described judging unit also for: when described evaporating temperature meets described first condition and second condition simultaneously, it is determined that the presence of frosting risk;

Wherein, described second condition comprises: be less than or equal to freezing point temperature.

The antifrost device of 12. air-conditioning equipments according to claim 9, is characterized in that, described acquiring unit comprises: gather subelement and computation subunit, or pre-stored subelement and inquiry subelement, wherein:

Described collection subelement is for gathering outdoor ambient temperature information and humidity information, and described computation subunit is used for utilizing described ambient temperature information and described humidity information, calculates described dew-point temperature according to preset formula;

Described pre-stored subelement is used for setting up in advance and the dry-bulb temperature outside locker room, the first relation table between wet-bulb temperature and the dew-point temperature of outdoor, and described inquiry subelement is used for from described first relation table, search the dew-point temperature corresponding with the current dry-bulb temperature of described outdoor unit heat exchanger and wet-bulb temperature;

Or described pre-stored subelement be used in advance set up and memory time information and the dew-point temperature of outdoor between the second relation table, and described inquiry subelement be used for from described second relation table, search the dew-point temperature corresponding with current time.

The antifrost device of 13. air-conditioning equipments according to claim 9, it is characterized in that, described processing unit is used for: the operating frequency of described frequency-changeable compressor is directly adjusted to predeterminated frequency, or progressively reduces the operating frequency of described frequency-changeable compressor according to preset ratio.

The antifrost device of 14. air-conditioning equipments according to any one of claim 9 to 13, is characterized in that, described processing unit also for: when it is determined that the presence of frosting risk, described outdoor unit heat exchanger is heated.

The antifrost device of 15. air-conditioning equipments according to claim 14, is characterized in that, described processing unit specifically for: heat flowing into the refrigerant of described outdoor unit heat exchanger.

The antifrost device of 16. air-conditioning equipments according to claim 14, is characterized in that, described acquiring unit also for: obtain outdoor humidity information; And

The antifrost device of described air-conditioning equipment also comprises:

Control unit, for when outside humidity is higher than the humidity threshold preset, allows described processing unit to heat described outdoor unit heat exchanger.

17. 1 kinds of air-conditioning equipments, is characterized in that, comprise the antifrost device of the air-conditioning equipment according to any one of claim 9 to 16.