CN105987484A - Defrosting control method and system used during heating frequent high-temperature prevention protection of air conditioner - Google Patents

Abstract

The invention relates to a defrosting control method and system used during heating frequent high-temperature prevention protection of an air conditioner. When the air conditioner operates in a heating mode, whether the air conditioner is in a frequent high-temperature prevention protection state or not is detected; if yes, the outdoor environment temperature T<outer circle> and outdoor coil pipe temperature T<e> are detected; and whether the air conditioner is in a defrosting state or not is judged through the relationship between the cumulative time t<b> when the outdoor environment temperature T<outer circle> is smaller than or equal to T<setting> and set time t<setting>. The influence of temperature fluctuation of an indoor coil pipe on the outdoor coil pipe temperature when the air conditioner is in the frequent high-temperature prevention protection state can be avoided, and the purpose of accurate defrosting is realized.

Description

The defrosting control method during protection of air-conditioning heating frequent high temperature-proof and system

Technical field

The invention belongs to air-conditioner defrosting and control technical field, specifically, relate to defrosting control method when the frequent high temperature-proof of a kind of air-conditioning heating is protected and system.

Background technology

Air-conditioning heating operation at low ambient temperatures, when outdoor heat exchanger surface temperature is in subzero, and during less than surrounding air dew point temperature, it may appear that frost, affects air-conditioning heating effect, needs to defrost it.Convertible frequency air-conditioner typically uses the defrosting control method that time and temperature combine at present: such as, under certain outdoor environment temperature, after operation of air conditioner exceedes the setting time, as continuous a period of time (such as: 2min) detects that outdoor coil temperature is less than design temperature, judge air-conditioning frosting, need to enter defrosting.

In actual use, there is situations below: when space excessive, residing, space heat insulating ability is poor, indoor environment temperature does not reaches design temperature in air-conditioning, air-conditioning can under less than a certain ambient temperature of design temperature continuous service.Now, if indoor apparatus of air conditioner air inlet or heat exchanger exist dirty stifled, then inside pressure can be caused higher, indoor coil pipe is bigger than normal, and air-conditioning can enter high temperature-proof protection, and compressor frequency reducing is until indoor coil pipe is less than high temperature-proof frequency reducing temperature；But owing to ambient temperature does not reaches design temperature, the target frequency of compressor still can be gradually increased, and causes indoor coil pipe to raise, it is again introduced into high temperature-proof protection, constantly repeats, occur fluctuating frequently.Owing in air conditioning chamber, off-premises station connected by connecting tube, indoor coil pipe fluctuation also results in outdoor pipe coil temperature and fluctuates the most accordingly, now, if off-premises station frosting is thicker, but due to the indoor coil pipe fluctuation impact on outdoor coil temperature, it is unable to reach entrance defrosting condition, it is impossible to enough defrost.Actual test finds, inner side 27(dry-bulb temperature)/-(wet bulb temperature), outside-7(dry-bulb temperature)/-8(wet bulb temperature) operating mode, high wind runs, half stifled interior machine both sides air inlet, outdoor coil temperature starts frequent fluctuation after running 5min, run after 30min outdoor coil temperature and be down to minimum temperature to during rising again, start that the situation less than design temperature occurs, in running subsequently, gradually stable less than the time of design temperature continuously, but it is unable to reach defrosting continuous detecting a period of time (such as: the 2min) requirement less than design temperature all the time, now, although the frosting of outer machine is thicker, but defrosting can not be entered.

Summary of the invention

It is an object of the invention to provide the defrosting control method during protection of a kind of air-conditioning heating frequent high temperature-proof, when solving the protection of existing air-conditioning heating frequent high temperature-proof, in the case of outdoor heat exchanger frosting, it is impossible to enough technical problems entering defrosting.

For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:

The defrosting control method during protection of a kind of air-conditioning heating frequent high temperature-proof, described method comprises the steps:

(1) air-conditioning heating runs, and detects indoor coil pipe T_k;

(2) if at a period of time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}, enter step (3)；

(3) detection outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, calculate outdoor coil temperature T_e≤T_SetCumulative time t_bIf, t_b≥t_Set, then defrosting is entered.

The accuracy of defrosting Rule of judgment, described outdoor environment temperature T is entered in order to promote air-conditioning further_{Outer shroud}Set at least to two temperature ranges, outdoor environment temperature T_{Outer shroud}It is in a T during temperature range_SetAnd t_SetFor fixed value, T_SetAnd t_SetAccording to T_{Outer shroud}The change of residing temperature range and change.

Further, described T_{Outer shroud}It is positioned at T during the high temperature range of temperature_SetMore than T_{Outer shroud}It is positioned at T during the low temperature range of temperature_Set.Described T_{Outer shroud}It is positioned at t during the high temperature range of temperature_SetLess than or equal to T_{Outer shroud}It is positioned at t during the low temperature range of temperature_Set。

Preferably, described outdoor environment temperature is divided into 4 temperature ranges.

The design of defrosting control method when protecting based on the frequent high temperature-proof of above-mentioned air-conditioning heating, the invention allows for a kind of control system, including:

Timing unit, is used for recording time t_a、t_b, and transmit to control unit；

Temperature detecting unit, is used for detecting indoor coil pipe T_k, outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, and transmit to control unit；

Control unit, at time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}After, outdoor coil temperature T_e≤T_SetCumulative time t_b≥t_SetTime, control air-conditioning and enter defrosting.

Compared with prior art, advantages of the present invention and good effect are: air-conditioning of the present invention is when heating operation, and whether detection air-conditioning is in frequent high temperature-proof guard mode, the most then detection outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, by outdoor coil temperature T_e≤T_SetCumulative time t_bWith setting time t_SetRelation judge whether to enter defrosting, it is possible to the indoor coil pipe fluctuation impact on outdoor coil temperature when avoiding air-conditioning frequent high temperature-proof guard mode, reach the purpose accurately defrosted.

After reading in conjunction with the accompanying the detailed description of embodiment of the present invention, the other features and advantages of the invention will become clearer from.

Accompanying drawing explanation

Fig. 1 is the flow chart of the specific embodiment of the invention.

Fig. 2 is indoor coil pipe and outdoor coil temperature variable condition schematic diagram in the specific embodiment of the invention.

Fig. 3 is the theory diagram of the specific embodiment of the invention.

Detailed description of the invention

Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in detail.

When air-conditioning heating runs, in the case of indoor set air inlet or heat exchanger exist dirty blocking up, inside pressure can be caused higher; indoor coil pipe is bigger than normal; now, air-conditioning can enter the high temperature-proof protection stage, i.e. controls compressor frequency reducing until indoor coil pipe is less than high temperature-proof frequency reducing temperature.And now; if indoor apparatus of air conditioner is in excessive space or heat-insulating property poor space; ambient temperature can be there is and do not reach the situation of design temperature all the time; the target frequency making compressor continues to increase; indoor coil pipe is caused to raise; it is again introduced into the high temperature-proof protection stage, constantly repeats, frequent high temperature-proof guard mode occurs.Now, if outdoor heat exchanger surface temperature is in subzero, and during less than surrounding air dew point temperature, outdoor heat exchanger surface there will be frosting, affects the heating effect of air-conditioning.But, owing in air conditioning chamber, off-premises station connected by connecting tube, outdoor coil temperature is caused to fluctuate the most accordingly while indoor coil pipe fluctuation, now, if the frosting of outer machine is thicker, but due to the indoor coil pipe fluctuation impact on outdoor coil temperature, outdoor coil temperature cannot be consistently lower than design temperature within continuous a period of time (such as: 2min), it is unable to reach entrance defrosting condition, it is impossible to enough defrost.The improvement that the present invention is carried out for above-mentioned situation just, when air-conditioning is in properly functioning, existing defrosting condition is utilized to defrost, as continuous a period of time (such as: 2min) detects that outdoor coil temperature is less than design temperature, judge air-conditioning frosting, enter defrosting mode；When air-conditioning is in frequent high temperature-proof guard mode, the cumulative time utilizing outdoor coil temperature to be less than design temperature judges air-conditioning whether frosting, enters defrosting mode, in order to preferably improve the heating effect of air-conditioning.

Concrete, as shown in Figure 1, 2, the defrosting control method during protection of the present embodiment air-conditioning heating frequent high temperature-proof comprises the steps:

S1, air-conditioning are opened, and enter heating operation mode.

S2, detection indoor coil pipe T_k；

If S3 is at a period of time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}, illustrate that air-conditioning is in frequent high temperature-proof guard mode, wherein, time t_aThe arbitrary value of 25-35min, preferably 30min, n is at least 3.

S4, detection outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, calculate outdoor coil temperature T_e≤T_SetCumulative time t_b。

If S5 is t_b≥t_Set, enter step S6.

S6, entrance defrosting.

Wherein, outdoor environment temperature T_{Outer shroud}Set at least to two temperature ranges, outdoor environment temperature T_{Outer shroud}It is in a T during temperature range_SetAnd t_SetFor fixed value, T_SetAnd t_SetAccording to T_{Outer shroud}The change of residing temperature range and change.T_{Outer shroud}It is positioned at T during the high temperature range of temperature_SetMore than T_{Outer shroud}It is positioned at T during the low temperature range of temperature_Set。T_{Outer shroud}It is positioned at t during the high temperature range of temperature_SetLess than or equal to T_{Outer shroud}It is positioned at t during the low temperature range of temperature_Set。

Outdoor environment temperature is divided into 4 temperature ranges by the present embodiment:

T_{Outer shroud}≥T_{Outer shroud 1}DEG C, T_Set= T_{Set 1}DEG C, t_Set= t_{Set 1}min；

T_{Outer shroud 2}℃≤T_{Outer shroud}＜ T_{Outer shroud 1}DEG C, T_Set= T_{Set 2}DEG C, t_Set= t_{Set 2}min；

T_{Outer shroud 3}℃≤T_{Outer shroud}< T_{Outer shroud 2}DEG C, T_Set= T_{Set 3}DEG C, t_Set= t_{Set 3}min；

T_{Outer shroud}< T_{Outer shroud 3}DEG C, T_Set= T_{Set 4}DEG C, t_Set= t_{Set 4}min。

Wherein, T_{Set 1}＞ T_{Set 2}＞ T_{Set 3}＞ T_{Set 4}, t_{Set 1}＜ t_{Set 2}＜ t_{Set 3}=t_{Set 4}。

Preferably,

T_{Outer shroud}>=-1 DEG C, T_Set=-5 DEG C, t_Set=7min；

-5℃≤T_{Outer shroud}＜-1 DEG C, T_Set=-10 DEG C, t_Set=10min；

-7℃≤T_{Outer shroud}<-5 DEG C, T_Set=-13 DEG C, t_Set=12min；

T_{Outer shroud}<-7 DEG C, T_Set=-15 DEG C, t_Set=12min。

The design of defrosting control method when protecting based on the frequent high temperature-proof of above-mentioned air-conditioning heating, the present embodiment also proposed the defrosting control system during protection of a kind of air-conditioning heating frequent high temperature-proof, including timing unit, temperature detecting unit and control unit.Control unit compares with pre-conditioned according to time parameter, the temperature parameter of temperature detecting unit detection of timing unit record, when meeting pre-conditioned, controls air-conditioning and enters defrosting mode.

Concrete, as it is shown on figure 3, the defrosting control system during protection of the present embodiment air-conditioning heating frequent high temperature-proof includes:

Timing unit, is used for recording time t_a、t_b, and transmit to control unit；

Temperature detecting unit, including the temperature sensor being installed on indoor heat exchanger coil pipe, is used for detecting indoor coil pipe T_k；It is installed on the outdoor environment temperature sensor of outdoor, is used for detecting outdoor environment temperature T_{Outer shroud}；It is installed on the temperature sensor on outdoor heat exchanger coil pipe, is used for detecting outdoor coil temperature T_e, and transmit to control unit；

Control unit, for receiving the clock signal that timing unit sends, the temperature signal of temperature detecting unit detection.At time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}After, as outdoor coil temperature T_e≤T_SetCumulative time t_b≥t_SetTime, control air-conditioning and enter defrosting.

Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (6)

1. defrosting control method during an air-conditioning heating frequent high temperature-proof protection, it is characterised in that described method comprises the steps:

Air-conditioning heating runs, and detects indoor coil pipe T_k;

If at a period of time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}, enter step (3)；

Detection outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, calculate outdoor coil temperature T_e≤T_SetCumulative time t_bIf, t_b≥t_Set, then defrosting is entered.

The defrosting control method during protection of air-conditioning heating the most according to claim 1 frequent high temperature-proof, it is characterised in that described outdoor environment temperature T_{Outer shroud}Set at least to two temperature ranges, outdoor environment temperature T_{Outer shroud}It is in a T during temperature range_SetAnd t_SetFor fixed value, T_SetAnd t_SetAccording to T_{Outer shroud}The change of residing temperature range and change.

The defrosting control method during protection of air-conditioning heating the most according to claim 2 frequent high temperature-proof, it is characterised in that described T_{Outer shroud}It is positioned at T during the high temperature range of temperature_SetMore than T_{Outer shroud}It is positioned at T during the low temperature range of temperature_Set。

The defrosting control method during protection of air-conditioning heating the most according to claim 2 frequent high temperature-proof, it is characterised in that described T_{Outer shroud}It is positioned at t during the high temperature range of temperature_SetLess than or equal to T_{Outer shroud}It is positioned at t during the low temperature range of temperature_Set。

The defrosting control method during protection of air-conditioning heating the most according to claim 2 frequent high temperature-proof, it is characterised in that described outdoor environment temperature is divided into 4 temperature ranges.

6. defrosting control system during an air-conditioning heating frequent high temperature-proof protection, it is characterised in that described control system includes:

Timing unit, is used for recording time t_a、t_b, and transmit to control unit；

Temperature detecting unit, is used for detecting indoor coil pipe T_k, outdoor environment temperature T_{Outer shroud}, outdoor coil temperature T_e, and transmit to control unit；

Control unit, at time t_aIn T detected n time continuously_k=T_{High temperature-proof frequency reducing}After, outdoor coil temperature T_e≤T_SetCumulative time t_b≥t_SetTime, control air-conditioning and enter defrosting.