CN1124460C - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN1124460C CN1124460C CN00101669A CN00101669A CN1124460C CN 1124460 C CN1124460 C CN 1124460C CN 00101669 A CN00101669 A CN 00101669A CN 00101669 A CN00101669 A CN 00101669A CN 1124460 C CN1124460 C CN 1124460C
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- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
To prevent drying of the heat-exchanger of an indoor unit by a method wherein the opening of a motor-drive expansion valve situated in a refrigerating cycle is properly controlled. In an air-conditioner, when a compressor is operated, an operation degree D-dis is computed from a discharge temperature T-dis and a preceding target discharge temperature TGT-dism. When the absolute value of the computed operation degree D-dis attains a given range, a dry degree D-sh is computed from a charge temperature T-sh and a coil temperature T-coil. Thereafter, an operation amount USH is set from the computed operation degree D-dis and the dry degree D-sh to determine a correction amount CSH. Based on a target discharge temperature Tgt-dis corrected by a discharge temperature Tgt-dis computed by the correction amount CSH, the opening of the motor-drive expansion valve is controlled.
Description
The present invention relates to a kind of separate type air conditioner, this air conditioner has indoor unit and outdoor unit, and the parts such as compressor, condenser, decompressor (electric expansion valve) and evaporimeter that constitute kind of refrigeration cycle are installed separately in said two units.
The air conditioner (hereinafter referred to as " air-conditioner ") that room air is regulated is to circulate in the kind of refrigeration cycle of utilizing cold-producing medium to form between indoor unit and outdoor unit, and the air that blows out from indoor unit is carried out adjustment.This air-conditioner is controlled the refrigerating capacity and the heating amount of the heat exchanger that is arranged on indoor unit (use as evaporimeter during refrigerating operaton, and use as condenser during heating operation) by the aperture that is controlled at the electric expansion valve that is provided with in the kind of refrigeration cycle.
This air-conditioner earlier will be to the target temperature of the cold-producing medium of discharging from compressor, be that the target discharge temperature is set, then, the control electric expansion valve makes the refrigerant temperature (discharge temperature) of discharging from compressor reach this target discharge temperature.
Yet, only controlling under the situation of electric expansion valve according to the target discharge temperature, if when moving with refrigeration mode, because of descending, evaporator temperature cause refrigerant pressure to descend, then under its acting in opposition, near the temperature the heat exchanger outlet of indoor unit tends to rising (heat exchanger begins to become the beginning exsiccation).If when on the heat exchanger of indoor unit, dry-out phenomenon occurring, this part just can not normally be carried out the cooling (and dehumidifying) of air, on the radiator fan of air-supply usefulness, can dewfall occur and adhere to water droplet, if under this dewfall state, blow, moisture will fly in the indoor unit, and in the outlet inlet chamber.
In view of the above problems, the objective of the invention is to propose a kind of control method of electric expansion valve, this method is by suitably controlling the electric expansion valve in the air-conditioner, and dry-out phenomenon appears in the heat exchanger of indoor unit when preventing as refrigerating operaton.
The air conditioner that the present invention relates to is for being controlled at the air conditioner of the flow of the cold-producing medium that circulates in the kind of refrigeration cycle by the aperture that changes electric expansion valve, this kind of refrigeration cycle is made of compressor, use side heat exchanger, electric expansion valve and heat source side heat exchanger at least.In addition, the aperture of control electric expansion valve, make the refrigerant temperature of discharging reach the target discharge temperature from compressor, simultaneously, the several values the temperature value of the cold-producing medium of discharging according to the temperature value that uses the side heat exchanger, from compressor and the refrigerant temperature value that compressor sucks is come the revise goal discharge temperature.
According to the present invention, according to the temperature of the cold-producing medium of discharging from compressor be discharge temperature, the refrigerant temperature that sucked by compressor is inlet temperature and to use the temperature of side heat exchanger be that coil temperature comes the revise goal discharge temperature.
Towards opening the direction action, thus, the temperature of heat exchanger is that coil temperature rises to electric expansion valve by reducing the target discharge temperature, and inlet temperature descends.
Here, owing to come the revise goal discharge temperature according to discharge temperature, inlet temperature and coil temperature, and control the aperture of electric expansion valve according to this target discharge temperature, therefore can suppress to use the drying of side heat exchanger, and can prevent because of using the side heat exchanger dewfall phenomenon that dry-out phenomenon produces to occur on radiator fan etc.
In the present invention, above-mentioned correction is performed such: when with coil temperature and inlet temperature being the value calculated of basis when surpassing setting, the target discharge temperature is reduced.
When inlet temperature increased, heat exchanger was easy to drying.Here, relatively coil temperature and discharge temperature judge whether heat exchanger is in easy drying regime.When being easy baking temperature, the target discharge temperature is descended.By above-mentioned correction, can suppress the drying of heat exchanger.
The present invention revises the target discharge temperature when inlet temperature is higher than coil temperature, so that the aperture of electric expansion valve increases.
When discharge temperature surpasses the target discharge temperature, use the side heat exchanger to be easy to drying.Here, when discharge temperature is high, the target discharge temperature is revised, made its decline.Thus, electric expansion valve is towards opening the direction action, and discharge temperature descends, and coil temperature rises, and inlet temperature descends simultaneously, thereby has suppressed the drying of heat exchanger.
In addition, the present invention also includes the external temperature checkout gear that detects external temperature, and above-mentioned correcting device is revised above-mentioned target discharge temperature according to external temperature.
According to the present invention, because when external temperature reduced, refrigerant pressure also can descend, therefore, when externally temperature is low, compare when high with external temperature, should be to the target discharge temperature towards the adjustment in direction that reduces.Thus, incident drying in the time of can suppressing to use the side heat exchanger externally temperature is relatively low.
In the present invention, preferably include according to coil temperature and inlet temperature and come the cold-producing medium of limit compression machine to discharge the restraint device of capacity.
By improving the rotating speed of compressor, improve refrigerating capacity.But if improve refrigerating capacity under heat exchanger is easy to dry status, cold-producing medium will liquefy, and heat exchanger is easier to drying.Therefore, under heat exchanger is easy to dry status, preferably reduce refrigerating capacity, will suppress the raising of refrigerating capacity at least, thus, reach the dewfall that inhibition causes because of the drying of heat exchanger.
Brief description of drawings is as follows:
Fig. 1 is the structure diagram that is applicable to the expression air-conditioner kind of refrigeration cycle of present embodiment.
Fig. 2 is the structure diagram of expression air-conditioner indoor unit.
Fig. 3 is the block diagram of the concise and to the point formation of element circuit in the expression air conditioner chamber.
Fig. 4 is the block diagram of the concise and to the point formation of expression outdoor unit of air-conditioner circuit.
Fig. 5 is the flow chart of the setting summary of expression revise goal discharge temperature correction.
Fig. 6 is the flow chart of the setting summary of expression target discharge temperature.
Fig. 7 comes the flow chart of one of the rotating speed of limit compression machine example according to the aridity of indoor unit heat exchanger for expression.
Below, embodiments of the invention are described.
Fig. 1 is the structure diagram of the air conditioner (calling " air-conditioner 10 " in the following text) that is applicable to present embodiment.Air-conditioner 10 is made of indoor unit 12 and outdoor unit 14, in addition, also can connect many indoor units 12 on outdoor unit 14.
The indoor unit 12 of air-conditioner 10 is connected circulation liquid refrigerant in the circulation gaseous refrigerant in the extra heavy pipe, tubule with the rough cryogen pipe arrangement of outdoor unit 14 usefulness 16A with thin refrigerant piping 16B.Be provided as the heat exchanger 18 that uses the side heat exchanger in the indoor unit 12, refrigerant piping 16A, a 16B end separately is connected with this heat exchanger 18.In addition, the other end of refrigerant piping 16A is connected on the valve 20A of outdoor unit 14.This valve 20A is connected with cross valve 24 through muffler 22A.Memory 28 is connected with this cross valve 24 with muffler 22B.Memory 28 and muffler 22B connect compressor 26 separately.
Be provided with heat exchanger 30 in the outdoor unit 14 as the heat source side heat exchanger.One side of this heat exchanger 30 connects cross valve 24, and opposite side is connected with valve 20B through capillary 32, filter 34 and adjuster 38.Electric expansion valve 36 is arranged between filter 34 and the adjuster 38.The other end of refrigerant piping 16B is connected with valve 20B, like this, and the closed circuit that the cold-producing medium of a formation of formation kind of refrigeration cycle is sealed between indoor unit 12 and outdoor unit 14.
As shown in Figure 2, indoor unit 12 possesses shell 42, has formed air entry 48 and exhaust outlet 50 on this shell 42, and utilizes substrate 40 on the medial surface be arranged on this shell 42 to be fixed on the specified altitude place of air conditioning chamber's wall etc.
Shutter 54 and left and right sides shutter 52 up and down are set on the outlet 50 of indoor unit 12, and shutter 54 and left and right sides shutter 52 just can change from the wind direction of the air-conditioning wind of outlet 50 discharges by adjusting up and down.For this air-conditioner 10, can manual mode change the direction of left and right sides shutter 52, mainly be by control up and down the direction of shutter 54 control the wind direction of the air-conditioning wind that outlet 50 blows out.Certainly, it is also passable fully to control the direction of the shutter up and down 54 of indoor unit 12 and left and right sides shutter 52 simultaneously.
As shown in Figure 3, power panel 56, control panel 58 and power relay plate 60 are arranged in the indoor unit 12.Motor power 62, control circuit power supply 64, series connection (serial) power supply 66 and drive circuit 68 are set on the power panel 56, are used to provide electric power (for example, the alternating current of single-phase 100V), make air-conditioner 10 operations.Series circuit 70, drive circuit 72 and microcomputer (microprocessor) 74 are arranged on the control panel 58.
The fan electromotor 76 (for example, dc brushless motor) that drives above-mentioned radiator fan 44 is connected on the drive circuit 68 of power panel 56, according to the control signal from the microprocessor on the control panel 58 74, provides driving electric power from motor power 62.At this moment, the output voltage of microprocessor 74 control drive circuits 68 changes 256 strides in the scope of 12V～36V, so that the air quantity of the air-conditioning wind that the outlet 50 of adjustment indoor unit 12 blows out.
Shutter motor 78 moves according to the control signal of microprocessor 74 and operates shutter 54 up and down up and down.Thus, air-conditioning wind blows out to desired zone from the outlet 50 of indoor unit 12.
Be connected the series circuit 70 on the series connection power supply 66 of microprocessor 74 and power circuit 56, be connected with outdoor unit 14, thus, between indoor unit 12 and outdoor unit 14, can carry out serial communication through binding post 90B, 90C.
On the other hand, display board 82 is connected with microprocessor 74.This display board 82 has display part and light accepting part.Display part is provided with the demonstration LED of demonstration running status etc., and light accepting part then possesses the photo detector of the operation signal that receives 120 outputs of not shown remote control switch.Thus, by the operating and remote controlling switch, this air-conditioner 10 carries out serial communication between indoor unit 12 and outdoor unit 14, and the line space of going forward side by side allocation and transportation row makes the indoor air-conditioning state of being set by remote control switch that becomes.
Fig. 4 shows the structure diagram of outdoor unit 14.Outdoor unit 14 is provided with terminal base 92, and the distribution that serial communication is used is connected on binding post 92A, the 92B of this terminal base 92 and the binding post 92B and 92C among the 92C.By binding post 90A and 90B to outdoor unit 14 supplying operation powers.
This outdoor unit 14 is provided with cowling panel 94 and control panel 96.Noise filter 100A, 100B, 100C, serial circuit 102 and Switching Power Supply 104 etc. are arranged on the control panel 96 with microprocessor 98.
94 pairs of electric currents of supplying with through noise filter 100A of cowling panel carry out rectification, become plateau current through noise filter 100B, 100C and supply with Switching Power Supply 104.Microprocessor 98 and change-over circuit 106 all are connected on the Switching Power Supply 104, from the control signal corresponding electric power of change-over circuit 106 to compressor electric motor 108 output frequencies and microprocessor 98 outputs, compressor 26 are rotated.
Microprocessor 98 controls are from the electric current of change-over circuit 106 outputs, so that it is stopped or the prescribed limit (upper limit is controlled at running current and is no more than setting) more than 14Hz (revolution is converted into frequency) in, thus, compressor electric motor 108 is that the revolution of compressor 26 obtains changing, thereby has controlled the ability (the cooling and warming ability of air-conditioner 10) of compressor 26.
As the method that changes compressor 26 rotating speeds, with Induction Motor Drive compressor 26 time, be the emulation sine wave of basic controlled frequency with the PWM theory from change-over circuit 106 outputs.Change the sinusoidal wave frequency of emulation, just can change the revolution of compressor 26.
If during with direct current generator (dc brushless motor) drive compression machine 26, with to turned position that should rotor and predefined energising figure, through change-over circuit 106 to the stator coil energising of regulation and keep rotation.At this moment, the cycle is intermittently to the stator coil energising, to alleviate the load of the switch element that constitutes change-over circuit 106 in accordance with regulations.Rotating speed is changed by changing chopped waveform connection load (ON-duty).
Fan electromotor 110, fan electromotor capacitor 110A are connected with this control panel 96, and fan electromotor 110 drives the not shown cooling cross valve 24 and the fan of heat exchanger 30 usefulness.
Microprocessor 98 corresponding operational modes are switched cross valve 24, according to from the control signal of indoor unit 12 and the testing result of various sensors described later, control the on/off of fan electromotor 110 and the rotating speed of compressor electric motor 108 etc. simultaneously.
The compressor temperature sensor 116 of the temperature that outdoor unit 14 is provided with the external temperature sensor 112, the coil temperature sensor 114 that detects the cold-producing medium coil temperature of heat exchanger 30 that detect external temperature, detect compressor 26 and the refrigerant temperature sensors 150,152 that detects the refrigerant temperature in the kind of refrigeration cycle, these sensors are connected with microprocessor 98.Microprocessor 98 carries out the output of these temperature sensors to deposit inside in and be used for control after A/D (analog/digital) conversion.
As shown in Figure 1, refrigerant temperature sensors 150 is arranged on the cold-producing medium outflow side of flowing out from compressor 26, and the temperature of the cold-producing medium that flows out from compressor 26 is detected as discharge temperature.Refrigerant temperature sensors 152 for example is arranged between the valve 20A and cross valve 24, when air-conditioner 10 moves with refrigeration mode, the temperature of the cold-producing medium that is inhaled into compressor 26 is detected as inlet temperature.
Air-conditioner 10 corresponding indoor temperatures and design temperature are set the rotating speed and the drive compression machine 26 of compressor 26.At this moment, the microprocessor 98 target setting discharge temperatures of outdoor unit 14 are controlled electric expansion valve 36 then, make by refrigerant temperature sensors 150 detected discharge temperatures consistent with the target discharge temperature.
Yet, air-conditioner 10 with the aperture of refrigeration mode control electric expansion valve 36 in service the time, the coil temperature that detects according to heat-exchanger temperature sensor 86, the discharge temperature that detects by refrigerant temperature sensors 150, the inlet temperature that detects by refrigerant temperature sensors 152 and revise by the external temperature that external temperature sensor 112 detects by indoor unit 12.Thus, for air-conditioner 10, can prevent to occur on the heat exchanger 18 because of indoor unit 12 dry-out phenomenon and cause dewfall on the radiator fan 44, promptly prevent the drying of heat exchanger 18.Dewfall on the radiator fan 44 is that the flabellum because of the humid air at the drying place of flowing through heat exchanger 18 contact cooling produces.
Air-conditioner 10 is revised the aperture of this electric expansion valve 36 by the revise goal discharge temperature.
Therefore, air-conditioner 10 is according to target discharge temperature Tgt-dism, discharge temperature T-dis, inlet temperature T-sh and the coil temperature T-coil of last time, obtains the aridity D-sh of heat exchanger 18 of indoor unit 12 and the operational readiness D-dis of the electric expansion valve 36 when revising the aperture of electric expansion valve 36 simultaneously.This aridity D-sh and operational readiness (deviation) D-dis presses following formula as an example and sets:
D-dis＝T-dis-Tgt-dism
D-sh＝T-sh-(T-coil-α)
Microprocessor 98 is set the operational ton USH of electric expansion valve 36 according to this aridity D-sh and operational readiness D-dis, sets the correction CSH of revise goal discharge temperature Tgt-dism again according to this operational ton USH.
According to following formula and according to operational ton USH and last time correction CSHm computed correction CSH.
CSH＝USH+CSHm
The initial value of correction CSHm is set at ' 0 ' (CSHm=0).
Air-conditioner 10 is according to operational readiness D-dis and aridity D-sh, in an embodiment with a routine setting operation amount USH shown in the table 1, be stored in the memory that do not go out among the figure that is arranged on the microprocessor 98 with the setting value of operational readiness D-dis and the corresponding operational ton USH of aridity D-sh.Table 1
| D-dis＞2 | 2≥D-dis＞1 | 1≥D-dis＞-1 | -1＞D-dis | |
| D-sh≥2 | 0 | -A | -B | - |
| 2＞D-sh≥1 | 0 | 0 | 0 | - |
| 1＞D-sh≥-1 | 0 | 0 | 0 | 0 |
| -1＞D-sh | E | F | G | 0 |
The ability that respectively is worth common corresponding kind of refrigeration cycle of A～G is set optimum value, but preferably in 1～5 scope.
Be shown below, according to external temperature To and correction CSH to last time target discharge temperature Tgt-dism revise and target setting discharge temperature Tgt-dism.
Tgt-dism＝Tgt-dism+C(To)+CSH
C (To) is the function based on external temperature, adjust each unit of air conditioner.
That is, when air-conditioner 10 serves as basis change target discharge temperature Tgt-dism with outside temperature T o, increase and decrease target discharge temperature Tgt-dism with correction CSH.
When discharge temperature T-dis was lower than target discharge temperature Tgt-dism, operational readiness D-dis was for negative.According to table 1, to reducing adjustment in direction USH, to closing direction operation electric expansion valve 36.When discharge temperature T-dis is higher than target discharge temperature Tgt-dism, operational readiness D-dis is timing, to increasing adjustment in direction operational ton USH, and towards opening direction operation electric expansion valve 36.Actual USH also wants the value of corresponding D-sh further to revise.
Poor for inlet temperature T-sh and coil temperature T-coil, promptly the constant alpha value among the aridity D-sh should be set like this, make its heat exchanger 18 during for wet condition for negative, make its heat exchanger 18 during for drying regime for just.
Thus, the setting of operational ton USH is carried out as follows: at aridity D-sh is timing, makes target discharge temperature Tgt-dism towards reducing adjustment in direction, and at aridity D-sh when negative, make target discharge temperature Tgt-dism towards the rising adjustment in direction.In the present embodiment, with 1 〉=D-dis 〉=-1,1.0＞D-sh 〉=-1.0 as the dead band so that heating mode when operation do not revise (correction CSH=0) according to correction CSH.
C (To) be one according to the predefined numerical value of external temperature To, in the present embodiment, table 2 shows the establishing method of one example, and this value is stored in the not shown memory of microprocessor 98 with operational ton USH, but, this correction C (To) also can omit.Table 2
| External temperature | Refrigeration | Heating mode | |
| 44≤To | | O | |
| 38≤To＜44 | I | ||
| 32≤To＜38 | | ||
| 26≤To＜32 | -J | ||
| 20≤To＜26 | -K | ||
| 5≤To＜20 | -L | ||
| -1≤To＜5 | -M | ||
| To＜-1 | -N |
Each value of H～N is set optimum value according to the kind of refrigeration cycle ability, but preferably is set in 1～30 the scope.
External temperature To is when reducing direction and change, and the temperature that then will only add 1 ℃ on by external temperature sensor 112 detected external temperature To is selected C (To) as external temperature To with this.
Air-conditioner 10 is operated electric expansion valve 36 according to the control stride that the target discharge temperature Tgt-dism that sets like this sets electric expansion valve 36 (stepper motor of electric expansion valve) with the control stride of setting.
Air-conditioner 10 just calculates target discharge temperature Tgt-dism every a stipulated time tsl (for example 120 seconds), through the PI computing, in each stipulated time ts2 (for example 10 seconds), electric expansion valve 36 is carried out stride control, so that discharge temperature T-dis becomes target discharge temperature Tgt-dism.
Below, the correction of target discharge temperature Tgt-dism mainly 98 that carry out by the microprocessor of outdoor unit 14, that carry out for control electric expansion valve 36 with reference to the flowchart text of Fig. 5 to Fig. 7.
When air-conditioner 10 entrys into service, calculate target discharge temperature Tgt-dism.This target discharge temperature Tgt-dism can set according to calculating as the rotating speed factors such as (average frequency in past and even present rotating speeds) of compressor 26.
This air-conditioner 10 is according to by refrigerant temperature sensors 150 detected discharge temperature T-dis, by refrigerant temperature sensors 152 detected inlet temperature T-ch, by external temperature sensor 112 detected external temperature To, and by the coil temperature T-coil of the heat exchanger 18 of the heat-exchanger temperature sensor 86 detected indoor units 12 of indoor unit 12, Tgt-dism revises to this target discharge temperature, thus, target discharge temperature Tgt-dism that can controlled electric expansion valve 36 apertures.
When Fig. 5 illustrates air-conditioner 10 and brings into operation, the setting program of the correction CSH that carries out in the tsl (for example at interval 120 seconds) at the appointed time.In the initial step 200 of this flow process, after correction CSH zero clearing, confirm in step 202 whether compressor 26 stops (whether the rotating speed f of compressor 26 is ' 0 '),, just begins to set correction CSH when compressor 26 begins to rotate that is.
Therefore, when compressor 26 rotates,, just jump to step 204 if in step 202, make affirmative determination.In step 204, calculating operation degree D-dis.
Operational readiness D-dis be discharge temperature T-dis and last time target discharge temperature Tgt-dism temperature difference, in this step 204, if read by refrigerant temperature sensors 150 detected discharge temperature T-dis, then can calculate this discharge temperature T-dis and last time target discharge temperature Tgt-dism poor.
In next step 206, whether the absolute value of confirming the operational readiness D-dis calculate is in setting.That is, confirm discharge temperature T-dis and last time target discharge temperature Tgt-dism difference whether in prescribed limit (in the present embodiment be example with 5 °).
Thus, the temperature difference of the target discharge temperature Tgt-dism that set when discharge temperature T-dis and last time then jumps to step 208, calcuating correction value CSH in setting the time (making affirmative determination in step 206).
In this step 208, read by refrigerant temperature sensors 182 detected inlet temperature T-sh and 86 detected by heat-exchanger temperature sensor, through the coil temperature T-coil of serial communication from indoor unit 12 outputs, just can calculate the aridity D-sh of heat exchanger 18.
Then, according to the operational readiness D-dis that calculates and aridity D-sh and table 1 setting operation amount USH,, calculate this correction CSH according to the correction CSHm of this operational ton USH and last time.
If try to achieve correction CSH with this, whether the correction CSH that then confirms to calculate in next step 210 is less than setting.And in step 212, confirm whether the correction CSH that calculates surpasses setting.That is, in step 210,212, the correction CSH that affirmation calculates whether (set :-15＜CSH＜0) in prescribed limit by an example of present embodiment.
Here, when the correction CSH that calculates (has made affirmative determination) in step 210,212 in prescribed limit, jump to step 214, the correction CSH that calculates is set at correction used when calculating target discharge temperature Tgt-dism.
Relatively, when the correction CSH that calculates when (CSH≤-15) (making negative judgement in step 210), jumps to step 216 below setting, correction CSH is set at lower limit (CSH=-15).And the correction CSH that calculates (0≤CSH) time (making negative evaluation in step 212), jumps to step 218, sets correction CSH for higher limit (CSH=0) more than setting.That is, correction CSH is limited in the scope (15≤CSH≤0) of regulation.
Like this, when set calculating the employed correction CSH of target discharge temperature Tgt-dism, in step 220, this correction CSH is set at employed correction CSHm last time (CSH=CSHm) when calculating next correction CSH.
Fig. 6 shows the summary of the target discharge temperature Tgt-dism that sets the stride control that is used for electric expansion valve 36 in air-conditioner 10.In the step 230 of beginning, calculate target discharge temperature Tgt-dism.
In next step 232, read by external temperature sensor 112 detected external temperature To, in step 234,, set correction C (To) according to operational mode and external temperature To according to above-mentioned table 2.
Afterwards, in step 236, confirm whether revise with correction CSH.
When revising, jump to step 238 here, with the repairing amount, read after the correction CSH by process settings shown in Figure 5, in step 238, calculate target discharge temperature Tgt-dism with external temperature To and correction CSH, just target discharge temperature Tgt-dism is revised.
This air-conditioner 10 when heating mode and the rotating speed of compressor 26 when significantly changing etc. under the situation, is preestablishing under the condition of target discharge temperature Tgt-dism being revised without correction CSH, after step 236 is made negative judgement, jumps to step 240.Thus, calculate target discharge temperature Tgt-dism in step 240, being convenient to carry out is the correction of benchmark with outside temperature T o only.
Like this, when calculating target discharge temperature Tgt-dism, in next step 242, confirm whether target discharge temperature Tgt-dism is being set at below the set point of temperature of ceiling temperature (for example 86 ℃).When target discharge temperature Tgt-dism is lower than ceiling temperature, (in step 242, be judged as certainly), then jump in the step 246, electric expansion valve 36 is carried out stride control with this target discharge temperature Tgt-dism.When surpassing, target discharge temperature Tgt-dism should go up (in step 242, being judged as negative) in limited time, then this target discharge temperature Tgt-dism is set at ceiling temperature (for example Tgt-dism=68 ℃), and electric expansion valve 36 is carried out stride control according to this target discharge temperature Tgt-dism.
When air-conditioner 10 moves with refrigeration mode, temperature according to the heat exchanger 18 of inlet temperature T-sh and indoor unit 12 is coil temperature T-coil, be difficult to occur dry status at heat exchanger 18, be to be under the moisture state before heat exchanger 18 outlets, aridity D-sh is for negative.
Relatively, when coil temperature T-coil rises, easily do near the outlet of heat exchanger 18.When heat exchanger 18 is comparatively dry, will be with dew on the radiator fan 44.At this moment, because of coil temperature T-coil can rise relatively for inlet temperature T-sh, aridity D-sh also can increase.
When discharge temperature T-dis is higher than target discharge temperature Tgt-dism, operational readiness D-dis become on the occasion of, and when discharge temperature T-dis was lower than target discharge temperature Tgt-dism, operational readiness D-dis became negative value.If the rotating speed of compressor 26 is certain, by opening electric expansion valve 36, increase refrigerant flow, then discharge temperature T-dis will descend, if the aperture of electric expansion valve 36 is diminished, suppresses refrigerant flow, and then discharge temperature T-dis will rise.
Target discharge temperature Tgt-dism increases by increasing correction CSH, reduces by reducing correction CSH.
The operational ton USH of correction CSH sets like this: reduce correction CSH by increasing aridity D-sh.Thus, when heat exchanger 18 is in easily wet state, and aridity D-sh is when increasing, and target discharge temperature Tgt-dism rises, and electric expansion valve 36 is towards opening the direction operation.Thereby suppressed heat exchanger 18 and become dry.
On the other hand, influenced by external temperature To bigger for refrigerant pressure.That is to say that external temperature increases, refrigerant pressure also rises, and when external temperature descended, refrigerant pressure also descended.For this reason, the aperture of electric expansion valve 36 is moved too, when external temperature To reduces, is easy to accumulate cold-producing medium in the outdoor heat converter 30, the result, and the cold-producing medium of supplying with heat exchanger 18 reduces, and heat exchanger 18 easily becomes dry.
Relatively, in the present invention, when external temperature To increased, target discharge temperature Tgt-dism changed towards the direction that raises.Thus, when external temperature To reduces, will not be opened to more than the required degree by electric expansion valve 36, simultaneously, when external temperature To raises, can suppress heat exchanger 18 and dry-out phenomenon occur.
Air-conditioner 10 is controlled the rotating speed of compressor 26 according to aridity D-sh.The example that the aridity D-sh that Fig. 7 uses when illustrating according to revise goal discharge temperature Tgt-dism controls the rotating speed of compressor 26.
In this flow process, in beginning step 250, time used in this flow process and mark made initial setting (reset) after, in step 252, read in the aridity D-sh that calculates in the flow process shown in Fig. 5.
In next step 254, confirm whether this aridity D-sh surpasses setting (is example with 3.0).And in step 256, read the control stride of electric expansion valve 36.In step 258, confirm whether the control stride reaches the upper limit.
The control stride that is lower than setting (D-sh＜3.0) or electric expansion valve 36 at aridity D-sh does not reach (being judged as negative) in limited time in step 254 or step 258, just jump to step 260, confirm according to the rotating speed of compressor 26 whether compressor 26 is in halted state.(be judged as negative in step 260) when compressor 26 is in halted state, this flow process finishes.Promptly this flow process is only carried out when compressor 26 rotates, and promptly resets whenever compressor 26 is under the halted state.
On the other hand, when the control stride that surpasses setting (D-sh 〉=3.0) and electric expansion valve 36 at aridity D-sh reaches the upper limit (being judged as certainly) in step 254 and step 258, jump to step 262, reset or bring into operation and be intended to control the timer of compressor 26 rotating speeds.
Afterwards, in step 264,266,268 and 270, with step 252,254,256,258 the same, confirm aridity D-sh whether more than setting and the control stride of electric expansion valve 36 whether reach the upper limit.In addition, in step 272, confirm whether the time of being counted by timer has reached the stipulated time (as 30 minutes).Promptly in step 264～272, confirm that at aridity D-sh be more than the setting and the control stride of electric expansion valve 36 reaches the time of whether continuing defined under the state of the upper limit.
Thus, if at the appointed time, when any one of aridity D-sh and control stride descends (be judged as under the negative state, be judged as negative) in step 266 or step 270 in step 272, will not restrictedly return step 252 to the rotating speed of compressor 26.On the contrary, if aridity D-sh more than the setting and the control stride of electric expansion valve 36 reached the time (in step 266,270,272, being judged as certainly) that the state of the upper limit continues defined, then the rotating speed to compressor 26 limits.
The rotating speed that limits this compressor 26 be exactly in step 274, make the rotating speed of compressor 26 drop to setting (as for current revolution 75%), and forbid that in step 276 rotating speed rises.Thus, air-conditioner 10 forbids that when the rotating speed that makes compressor 26 descends rotating speed rises, and forbids that promptly the cold-producing medium discharge pressure rises.
Thus, even the cold-producing medium discharge pressure descends with the rotating speed of compressor 26, for example, liquid refrigerant is trapped in the heat exchanger 30 that in the kind of refrigeration cycle, particularly is trapped in outdoor unit, become easy dry status on the heat exchanger 18 of indoor unit 12, also can suppress the drying of heat exchanger 18, and prevent to occur on the radiator fan 44 the dewfall phenomenon.
In next step 278, confirm whether to be provided with mark.If in the time of will resetting mark, jump to step 280, set expression and set the mark of forbidding that rotating speed rises.
If the rotating speed to compressor 26 is limited like this, then in next step 282, read aridity D-sh, confirm whether this aridity D-sh drops to below the value of regulation (for example-1.0).
If aridity D-sh does not drop to below the setting, when heat exchanger 18 is in hygrometric state, in step 284, be judged as certainly.Thus, jump to step 286, remove to the rotating speed of compressor 26 forbid rise.
Like this, air-conditioner 10 is by revising target discharge temperature Tgt-dism, the heat exchanger 18 that just can prevent indoor unit 12 produces dry-out phenomenon, however, when on heat exchanger 18, continuing to keep dry state, then, forbid that simultaneously the rotating speed of compressor 26 rises, just can prevent the drying of heat exchanger 18 more reliably by reducing the rotating speed of compressor 26.In case heat exchanger 18 reaches in the time of can not producing dry status, just allow the revolution of compressor 26 to rise.
After having set that the rotating speed of forbidding compressor 26 rises and mark when being set, in step 278, being judged as certainly, jump to step 288, confirm whether compressor 26 is in halted state.When compressor 26 is in halted state, then jump to step 290, remove to compressor 26 rotating speeds forbid rise after, this flow process finishes.
If this air-conditioner 10 is when preventing that the dry rotating speeds to compressor 26 of heat exchanger 18 from limiting for the second time, before compressor 26 stops, not removing revolution forbid rise.
The aforesaid air-conditioner 10 that is suitable for present embodiment is not limited to the structure of the air conditioner that the present invention is suitable for, and the present invention also is applicable to the air conditioner of being adjusted any a structure of the refrigerant flow in the kind of refrigeration cycle by electric expansion valve.
According to aforesaid the present invention, its optimum efficiency is: by take discharge temperature, inlet temperature and coil temperature as foundation the target discharge temperature being revised, can control electric expansion valve corresponding to the aridity of the heat exchanger of indoor unit, can prevent the dewfall phenomenon that the drying because of heat exchanger causes.
Claims (5)
1. air conditioner, this air conditioner by the aperture that changes electric expansion valve be controlled at least by compressor, use side heat exchanger, electric expansion valve and heat source side heat exchanger to constitute kind of refrigeration cycle in the refrigerant flow that circulates, it is characterized in that, control the aperture of described electric expansion valve, make the refrigerant temperature of discharging from compressor reach the target discharge temperature, the temperature value of the cold-producing medium of discharging according to the temperature value that uses the side heat exchanger, from compressor and the several values of the refrigerant temperature value that compressor sucks are revised above-mentioned target discharge temperature simultaneously.
2. air conditioner according to claim 1, it is characterized in that, above-mentioned correction is the temperature of the cold-producing medium that sucks in above-mentioned compressor when being higher than the temperature of above-mentioned use side heat exchanger, opens above-mentioned electric expansion valve, and above-mentioned target discharge temperature is revised and made its reduction.
3. air conditioner according to claim 1 and 2, it is characterized in that, above-mentioned correction is the temperature of the cold-producing medium that sucks when above-mentioned compressor when higher than above-mentioned target discharge temperature, and above-mentioned electric expansion valve is opened, and above-mentioned target discharge temperature is revised made its reduction.
4. air conditioner according to claim 1 and 2 is characterized in that, above-mentioned correction is that the above-mentioned target discharge temperature of the above-mentioned target discharge temperature when making external temperature low when higher than external temperature reduces.
5. air conditioner according to claim 1 and 2, it is characterized in that, the temperature of the cold-producing medium that sucks according to the temperature of above-mentioned use side heat exchanger and above-mentioned compressor limits the service ability of above-mentioned compressor, when the temperature of the cold-producing medium that sucks when above-mentioned compressor and the temperature of above-mentioned use side heat exchanger are high, to suppress the service ability of above-mentioned compressor at least.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP026325/1999 | 1999-02-03 | ||
| JP2632599 | 1999-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1264024A CN1264024A (en) | 2000-08-23 |
| CN1124460C true CN1124460C (en) | 2003-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00101669A Expired - Fee Related CN1124460C (en) | 1999-02-03 | 2000-01-28 | Air conditioner |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100545009B1 (en) |
| CN (1) | CN1124460C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3772777B2 (en) * | 2002-03-27 | 2006-05-10 | ダイキン工業株式会社 | Air conditioner and control method of air conditioner |
| WO2004068045A1 (en) * | 2003-01-28 | 2004-08-12 | Halla Climate Control Corp. | Supercritical refrigerating cycle |
| KR101479240B1 (en) * | 2008-07-14 | 2015-01-06 | 삼성전자 주식회사 | Air conditioner and method of controlling the same |
| JP5040975B2 (en) * | 2008-09-30 | 2012-10-03 | ダイキン工業株式会社 | Leakage diagnostic device |
| CN104005214B (en) * | 2013-02-22 | 2017-09-29 | 青岛海尔洗衣机有限公司 | A kind of control method of heat pump clothes dryer expansion valve |
| CN103398446B (en) * | 2013-07-11 | 2015-09-30 | 四川长虹电器股份有限公司 | A kind of method improving air-conditioning heating refrigeration |
| CN105627524B (en) * | 2016-03-14 | 2018-06-01 | 广东美的制冷设备有限公司 | Air conditioner anti-freeze control method and air conditioner |
| CN108626844A (en) * | 2018-04-18 | 2018-10-09 | 芜湖乐锐思信息咨询有限公司 | The application method of heating ventilation air-conditioning system based on big data technology |
| CN109099559A (en) * | 2018-07-25 | 2018-12-28 | 广东美的制冷设备有限公司 | The modification method and device of air conditioner delivery temperature |
| CN111322801B (en) * | 2020-02-27 | 2021-05-11 | 广东志高暖通设备股份有限公司 | Control method and device of electronic expansion valve |
-
1999
- 1999-12-14 KR KR1019990057616A patent/KR100545009B1/en not_active IP Right Cessation
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2000
- 2000-01-28 CN CN00101669A patent/CN1124460C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1264024A (en) | 2000-08-23 |
| KR100545009B1 (en) | 2006-01-24 |
| KR20000057057A (en) | 2000-09-15 |
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