CN1135337C - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN1135337C
CN1135337C CNB001288830A CN00128883A CN1135337C CN 1135337 C CN1135337 C CN 1135337C CN B001288830 A CNB001288830 A CN B001288830A CN 00128883 A CN00128883 A CN 00128883A CN 1135337 C CN1135337 C CN 1135337C
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CN
China
Prior art keywords
mentioned
compressor
microcomputer
sensing means
current sensing
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Expired - Lifetime
Application number
CNB001288830A
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Chinese (zh)
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CN1292479A (en
Inventor
甲斐昭裕
Ҳ
板垣政也
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication of CN1292479A publication Critical patent/CN1292479A/en
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Publication of CN1135337C publication Critical patent/CN1135337C/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • F25B2700/151—Power, e.g. by voltage or current of the compressor motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention relates to air conditioner which is capable to enable operation of a high-pressure switch to be judged in a short period of time. The air conditioner comprises a refrigerant circulating circuit for circulating refrigerant discharge from a condenser to an evaporator, a current sensing means for sensing an operating current of the compressor, a microcomputer for discriminating an operating state of the compressor on the basis of detection result; a driving means for receiving the instruction from the microcomputer and driving the compressor, a high-pressure switch inserted in an electric circuit of the driving means in series and operated, in response to a discharged pressure of the compressor. The microcomputer discriminates activation of the high pressure gas switch, in reference to a result of sensing operation of the current sensing means.

Description

Air-conditioner
Technical field
The present invention relates to air-conditioner.
Background technology
Fig. 8 represents for example special figure that drives the control device of disclosed existing aircondition in the flat 9-14805 communique.Among the figure, (being between the R-S among the figure) holding circuit that all is being connected in series 42, relay contact 36 and compressor magnet (the compressor operating magnet exciting coil of electromagnetic contactor) 38 between any two-phase in the three-phase alternating-current supply (R, S, T) of air-conditioner.
Holding circuit 42 comprises inner thermoswitch (bimetallic) 26 of the inner thermoswitch of pressure fan (bimetallic) 24, compressor and the high-voltage switch gear 28 that is connected in series.
Be connected in parallel with the photoelectrical coupler (photoelectricity bidirectional triode thyristor coupler etc.) 44 of optical coupler and relay contact 36 and compressor magnet 38 as signal transmission, be supplied to microcomputer 46 from the anomaly detection signal of photoelectrical coupler 44.In addition, microcomputer 46 makes relay contact 36 carry out on-off action.
In above-mentioned circuit structure; if the temperature anomaly of wind pushing motor; then thermoswitch 24 disconnects; if the temperature anomaly of air compressor motor; then thermoswitch 24 disconnects, if the temperature anomaly of air compressor motor becomes unusually, then protection switch 26 disconnects; if abnormal pressure appears in compressor, then high-voltage switch gear 28 disconnects.These three kinds of abnormalities also can overlap generation sometimes simultaneously except situation about taking place separately separately.If any one disconnection in thermoswitch 24,26, the high-voltage switch gear 28, just holding circuit 42 is off-state.Therefore stop to 38 power supplies of compressor magnet, compressor stops.
Secondly, illustrate that air-conditioner takes place when unusual, poor according to the recovery time of thermoswitch 24,26, high-voltage switch gear 28, the work of judgement out-of-the way position.
In Fig. 8, photoelectrical coupler 44 is off-state, has following four kinds of situations.
(1) instantaneous power failure (power supply between the R-S disconnects)
When (2) high-voltage switch gear 28 of compressor disconnects
When (3) the inner thermoswitch 24 of pressure fan disconnects
When (4) the inner thermoswitch 26 of compressor disconnects
Here, in general, the instantaneous power failure of (1) is the longest in several milliseconds of extremely hundreds of milliseconds, so instantaneous power failure takes place after 1 second, photoelectrical coupler 44 just recovers on-state.
In addition, the high-voltage switch gear 28 of (2) is set differential usually like this, makes it " 30Kg/cm 2The time open (disconnection), 28.5Kg/cm 2Shi Huifu (connection) ".Therefore, the pressure of compressor is greater than 30Kg/cm 2The time, high-voltage switch gear 28 disconnects, even compressor stops, high-voltage switch gear 28 does not also recover at once, makes the hp and lp bypass of refrigerant loop with magnetic valve (with reference to the by-passing valve among Fig. 9 30), and the pressure in the compressor drops to 28.5Kg/cm 2The time high-voltage switch gear 28 return to closure state, the needed time of this recovery process is the several seconds.
On the other hand, the pressure fan of (3), (4) and the inside thermoswitch of compressor 24,26 be according to the anomaly detection signal from photoelectrical coupler 44, utilizes recovery time poor of each thermoswitch 26,28, judged which switch motion.
Existing air-conditioner is exactly as above to constitute, and as the method for judging which protective device has moved, is according to judging the recovery time of each thermoswitch, so there is the problem that spended time is wanted in judgement of finishing.
In addition,,, owing to be switch motion arbitrarily, and do not show the device whether compressor stops, so efficient is not high when keeping in repair though which switch motion microcomputer has judged no matter after which switch motion, compressor all can stop.
In addition, under the situation that the wiring between the switch comes off, perhaps under the situation of the broken string of the wiring between the switch, even connect main power source, make the air-conditioner running, compressor magnet can not be switched on, the problem that exists compressor not turn round.
Summary of the invention
The present invention finishes in order to solve such problem, and purpose is just can judge at short notice the action of high-pressure switch.
Maintenance when in addition, purpose is to carry out the high-pressure switch action effectively.
In addition, purpose is to carry out effectively the maintenance of high-pressure switch when unusual.
In addition, purpose is to carry out effectively the maintenance when unusual of the current sensing means of compressor.
According to a kind of air-conditioner of the present invention, it is characterized in that having: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge; Detect the current sensing means of the revolution electric current of above-mentioned compressor; According to the testing result of this current sensing means, judge the microcomputer of the operating condition of above-mentioned compressor; Receive the instruction of this microcomputer, drive the drive unit of above-mentioned compressor; And the circuit of this drive unit is inserted in series connection, based on the discharge pressure of above-mentioned compressor and the high-pressure switch that moves, above-mentioned microcomputer comparison detects current value from the revolution electric current value of above-mentioned current sensing means and the action of above-mentioned high-pressure switch, and detect current value when following in this action in the revolution electric current value of this compressor, stop the running of above-mentioned compressor.
In addition, have, show the display unit of the operating condition of compressor according to instruction from microcomputer.
In addition, have: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge; Detect the current sensing means of the revolution electric current of compressor; The high-pressure side refrigerant temperature checkout gear of the temperature of the on high-tension side cold-producing medium of detection refrigerant circulation loop; According to the testing result of current sensing means and high-pressure side refrigerant temperature checkout gear, judge the microcomputer of the operating condition of compressor; And the instruction that receives this microcomputer, the drive unit of drive compression machine, temperature-resistantization that is detected at high-pressure side refrigerant temperature checkout gear and the detected value of current sensing means are under the situation below the high-pressure switch motion detection current value, and microcomputer concludes that the drive unit broken string or the line of compressor come off.
In addition, have, show the drive unit broken string of compressor or the display unit that line comes off according to instruction from microcomputer.
In addition, have: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge; Detect the current sensing means of the revolution electric current of compressor; The high-pressure side refrigerant temperature checkout gear of the temperature of the on high-tension side cold-producing medium of detection refrigerant circulation loop; According to the testing result of current sensing means and high-pressure side refrigerant temperature checkout gear, judge the microcomputer of the operating condition of compressor; And the instruction that receives this microcomputer, the drive unit of drive compression machine, the temperature that is detected at high-pressure side refrigerant temperature checkout gear rise change and also the detected value of current sensing means under the situation below the high-pressure switch motion detection current value, microcomputer concludes that current sensing means is unusual.
In addition, have, show the unusual display unit of current sensing means according to instruction from microcomputer.
Current sensing means constitutes like this: make the wiring that becomes detected object pass toroidal core, according to the size of the electric current that flows through in the wiring, utilize the mutual inductance effect, change the size of induced electromotive force.
In addition, the detected temperatures of discharging refrigerant temperature-detecting device rise change and also the detected value of current sensing means under the situation below the high-pressure switch motion detection current value, microcomputer concludes that current sensing means normally is not arranged on the power of compressor line.
In addition, refrigerant temperature checkout gear in high-pressure side detects the refrigerant temperature that compressor is discharged.
In addition, refrigerant temperature checkout gear in high-pressure side detects the temperature of condenser.
In addition, refrigerant temperature checkout gear in high-pressure side detects the outlet temperature of condenser.
Description of drawings
Fig. 1 is the figure of expression embodiment 1～3, is the air-conditioner overall construction drawing.
Fig. 2 is the figure of expression embodiment 1, is the flow chart of the action checking method of high-pressure switch.
Fig. 3 is the figure of expression embodiment 2, is when detecting the action of high-pressure switch, operating condition is presented at the flow chart of the method on the monitor display part.
Fig. 4 is the figure of expression embodiment 2, is the figure of one of the displaying contents example on the expression monitor display part.
Fig. 5 is the figure of expression embodiment 3, is to utilize current sensor and the discharging refrigerant temperature detection variations in temperature with thermistor, detect wiring come off or break, connect up be provided with the flow chart of abnormal detection method.
Fig. 6 is the figure of expression embodiment 3, is the figure of one of the displaying contents example on the expression monitor display part.
Fig. 7 is the figure of expression embodiment 3, is the figure of one of the displaying contents example on the expression monitor display part.
Fig. 8 is the circuit diagram of the protective device of existing air-conditioner.
Fig. 9 is the refrigeration cyclic graph of existing air-conditioner.
The specific embodiment
Embodiment 1
Below, with reference to description of drawings embodiments of the invention 1.
Fig. 1 is the figure of expression embodiment 1, is the air-conditioner overall construction drawing.
Among the figure, the 1st, the compressor of compressed refrigerant connects into ring-type with compressor 1 and cross valve 2, condenser 3, electric expansion valve 4, evaporimeter 5 successively with refrigerant tubing, constitutes the kind of refrigeration cycle as refrigerant circulation loop.
The 6th, the outdoor control substrate that carries out the control of off-premises station, 7 off-premises stations that are mounted on this outdoor control substrate 6 are controlled with microcomputer (also claiming microcomputer).
The 8th, the high-pressure switch that utilizes discharge pressure to move, the 9th, the low pressure switch that utilizes suction pressure to move.The operating state of low pressure switch 9 is taken into off-premises station control with in the microcomputer 7.The 10th, the thermoswitch that utilizes temperature to move, the operating state of thermoswitch 10 are taken into off-premises station control with in the microcomputer 7.
Electric expansion valve 4 is electric expansion valves of control refrigerant flow, controls with the instruction of microcomputer 7 according to controlling from off-premises station.
As high-pressure side refrigerant temperature checkout gear, the thermistor 13 of the outlet temperature of the thermistor 11 of the discharging refrigerant temperature that detects compressor 1, the thermistor 12 that detects the temperature of condenser, detection condenser is set.The information of thermistor 11～13 is taken into off-premises station control with in the microcomputer 7.
14 are arranged on the monitor display part that conduct on the outdoor control substrate 6 shows the display unit of various information, the 15th, as the current sensor of current sensing means, it adopts and makes the wiring that becomes detected object pass toroidal core, size according to the electric current that flows through in the wiring, utilize the mutual inductance effect, change the method for the size of induced electromotive force, detect the revolution electric current of compressor 1, be taken into off-premises station control with in the microcomputer 7 by translation circuit 16.
17a is the contact of compressor control with relay, utilization applies the wiring 18 that voltage uses and connects the contact 17a of compressor control with relays, utilize the switching of compressor control, industrial power 21 is switched on or switched off, the running of control compressor 1 with the contact 17a of relay.In addition, make to compressor 1 and apply the toroidal core that current sensor 15 is passed in any wiring in the wiring 18 that voltage uses.
17b is a magnet exciting coil of using relay as the compressor control of the drive unit of drive compression machine 1.19a applies voltage or disconnects the control relay of controlling the magnet exciting coil 17b of compressor control with relay, and 19b is the magnet exciting coil of control relay 19a.According to from the instruction of off-premises station control, control magnet exciting coil 19b by drive circuit portion 20 with microcomputer 7.
Here, the contact of high-pressure switch 8 is connected in series between the magnet exciting coil 17b and the wiring of compressor control with the control relay 19a of relay of compressor control relay.
With flow chart shown in Figure 2, the work of the air-conditioner that as above constitutes is described.
At first, air-conditioner is running in a single day, and in step 201, outdoor control is read in temperature of being set by the remote controller that is connected on the indoor set and the temperature that is detected the thermistor detection by indoor temperature with microcomputer 7.
Secondly, in step 202, to the design temperature of the remote controller that in step 201, reads in detect the temperature that thermistor detects by indoor temperature and compare, judge whether compressor 1 is under the operating condition.
In step 202, under compressor 1 is not in situation under the operating condition, return step 201, outdoor control is read in the temperature set by the remote controller that is connected on the indoor set once more and is detected the temperature that thermistor detects by indoor temperature with microcomputer 7.
Compressor 1 is under the situation of operating condition in step 202, makes compressor 1 running in step 203.
Secondly, in step 204, whether the revolution electric current of judging the compressor 1 that detects with current sensor 15 is below high-pressure switch motion detection current value.
In step 204, under the situation more than the high-pressure switch motion detection current value, return step 203 in the revolution electric current of the compressor 1 that detects with current sensor 15, compressor 1 is remained in operation.
In step 204, under the situation below the high-pressure switch motion detection current value, compressor 1 is stopped in the revolution electric current of the compressor 1 that detects with current sensor 15.
Above result can judge that high-pressure switch 8 has attonity according to the testing result of current sensor 15.
In addition, in the above-described embodiment, as apply voltage method (industrial power 21) to compressor 1, though Fig. 1 shows the method for using the three-phase industrial power, even under the situation of using single-phase industrial power, also can obtain same effect.
Embodiment 2
Below, with reference to description of drawings embodiments of the invention 2.
Fig. 3, the 4th, the figure of expression embodiment 2, Fig. 3 is expression when detecting the action of high-pressure switch, and operating condition is presented at the flow chart of the method on the monitor display part, Fig. 4 is the figure of one of the displaying contents on expression monitor display part example.In addition, the general structure of air-conditioner is identical with Fig. 1.
Below, according to flow process shown in Figure 3, the work of the air-conditioner of embodiment 2 is described.
At first, air-conditioner is running in a single day, and in step 301, outdoor control is read in temperature of being set by the remote controller that is connected on the indoor set and the temperature that is detected the thermistor detection by indoor temperature with microcomputer 7.
Secondly, in step 302, to the design temperature of the remote controller that in step 301, reads in detect the temperature that thermistor detects by indoor temperature and compare, judge whether compressor 1 is under the operating condition.
Compressor 1 is not under the situation of operating condition in step 302, returns step 301, and off-premises station control is read in temperature of being set by the remote controller that is connected on the indoor set and the temperature that is detected the thermistor detection by indoor temperature once more with microcomputer 7.
In step 302, be at compressor 1 under the situation of operating condition, in step 303, make compressor 1 running, secondly, in step 304, show that with mark compressor 1 has turned round.
Secondly, in step 305, whether the revolution electric current of judging the compressor 1 that detects with current sensor 15 is below high-pressure switch motion detection current value.
In step 305, under the situation more than the high-pressure switch motion detection current value, return step 303 in the revolution electric current of the compressor 1 that detects with current sensor 15, compressor 1 is remained in operation.
In step 305, under the situation below the high-pressure switch motion detection current value, compressor 1 is stopped in the revolution electric current of the compressor 1 that detects with current sensor 15.
Secondly, in step 307, as shown in Figure 4, on monitor display part 14, show that with mark high-pressure switch 8 actions, compressor 1 have stopped.
Above result can show that on monitor display part 14 high-pressure switch 8 has attonity, so can raise the efficiency according to the testing result of current sensor 15 under the situation of keeping in repair.
Embodiment 3
Below, with reference to description of drawings embodiments of the invention 3.
Fig. 5,6, the 7th, the figure of expression embodiment 3, Fig. 5 utilizes current sensor and the discharging refrigerant temperature detection variations in temperature of thermistor, detect wiring come off or break, connect up be provided with the flow chart of abnormal detection method, Fig. 6, the 7th represents the routine figure of one of displaying contents on the monitor display part.In addition, the general structure of air-conditioner is identical with Fig. 1.
Below, according to flow process shown in Figure 5, the work of the air-conditioner of embodiment 3 is described.
At first, air-conditioner is running in a single day, and in step 501, outdoor control is read in temperature of being set by the remote controller that is connected on the indoor set and the temperature that is detected the thermistor detection by indoor temperature with microcomputer 7.
Secondly, in step 502, to the design temperature of the remote controller that in step 501, reads in detect the temperature that thermistor detects by indoor temperature and compare, judge whether compressor 1 is under the operating condition.
Compressor 1 is not under the situation under the operating condition in step 502, returns step 501, and outdoor control is read in the temperature set by the remote controller that is connected on the indoor set once more and detected the temperature that thermistor detects by indoor temperature with microcomputer 7.
In step 502, be at compressor 1 under the situation of operating condition, in step 503, be taken into the temperature (T0) of discharging refrigerant temperature detection with thermistor 11, in step 504, make compressor 1 running.In addition, in step 505, show that with mark compressor 1 has turned round.
Secondly, in step 506, set the timer t1 that the 1 running stipulated time of compressor is used.
Secondly, in step 507, make the timer t1 that the 1 running stipulated time of compressor is used that in step 506, sets subtract 1.
Secondly, in step 508, judge whether the running (t1) of the stipulated time of compressor 1 finishes.In step 508, if the running of the stipulated time of compressor 1 does not finish, compressor 1 is remained in operation, return step 507.
If the running of the stipulated time of compressor 1 finishes in step 508, in step 510, the eliminating refrigerant temperature after the running (t1) that is taken into the stipulated time finishes detects the temperature (T1) with thermistor 11.
Secondly, in step 511, the eliminating refrigerant temperature that is taken in step 503 detected with the temperature (T0) of thermistor 11 and the eliminating refrigerant temperature detection that is taken in step 510 temperature (T1) with thermistor 11 compare.
In step 511, under the situation of T0＜T1, in step 512, whether the revolution electric current of judging the compressor 1 that detects with current sensor 15 is below high-pressure switch motion detection current value, not when high-pressure switch motion detection current value is following, in step 513, compressor 1 is remained in operation.
In step 512, in the revolution electric current of compressor 1 under the situation below the high-pressure switch motion detection current value, compressor 1 is stopped, in step 515, show error condition as shown in Figure 7 normally not being arranged on the current sensor 15 as wiring on the monitor display part 14.
In step 511, under the situation that is not T0＜T1, in step 516, whether the revolution electric current of judging the compressor 1 that detects with current sensor 15 is below high-pressure switch motion detection current value, when high-pressure switch motion detection current value is following, do not return step 503.
In step 516, in the revolution electric current of compressor 1 under the situation below the high-pressure switch motion detection current value, compressor 1 is stopped, in step 518, the wiring of the circuit that connects as the magnet exciting coil 17b of the contact of high-pressure switch 8 or compressor control relay on monitor display part 14 comes off or breaks and show error condition as shown in Figure 6.
Above result can conclude that wiring comes off or breaks or connect up normally not to be arranged on the current sensor, shows error condition on monitor display part 14.
In addition, in the above-described embodiment, though utilize the temperature that detects with thermistor 11 by the discharging refrigerant temperature detection, judge whether refrigerant temperature has changed, but when the temperature of promptly using condenser temperature to detect thermistor 13 detections of using with thermistor 12 or with detection condensator outlet temperature is judged, also can obtain same effect.
Air-conditioner of the present invention can be judged the action of high-pressure switch in high-pressure switch work and compressor when stopping according to the testing result of current sensing means, judges that high-pressure switch has attonity in the very short time.
In addition, after the high-pressure switch action,, can improve the efficient when keeping in repair by showing that on display unit compressor stops.
In addition, microcomputer can judge that according to the detected temperatures of high-pressure side refrigerant temperature checkout gear and the detected value of current sensing means the drive unit broken string or the line of compressor comes off.
In addition, according to instruction, show that on display unit the drive unit broken string or the line of compressor comes off, even desire to make compressor operation from microcomputer, there is not the problem that to switch in the drive unit of compressor and can not turn round yet, can improves the efficient when keeping in repair.
In addition, microcomputer utilizes the detected temperatures of high-pressure side refrigerant temperature checkout gear and the detected value of current sensing means, can judge the unusual of current sensing means.
In addition,, on display unit, show the unusual of current sensing means, can improve the efficient when keeping in repair according to instruction from microcomputer.

Claims (11)

1. an air-conditioner is characterized in that having: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge;
Detect the current sensing means of the revolution electric current of above-mentioned compressor;
According to the testing result of this current sensing means, judge the microcomputer of the operating condition of above-mentioned compressor;
Receive the instruction of this microcomputer, drive the drive unit of above-mentioned compressor; And
The circuit of this drive unit is inserted in series connection, the high-pressure switch that moves based on the discharge pressure of above-mentioned compressor,
Above-mentioned microcomputer comparison detects current value from the revolution electric current value of above-mentioned current sensing means and the action of above-mentioned high-pressure switch, and detects current value when following in the revolution electric current value of this compressor in this action, stops the running of above-mentioned compressor.
2. air-conditioner according to claim 1 is characterized in that: have according to the instruction from above-mentioned microcomputer, show the display unit of the operating condition of above-mentioned compressor.
3. an air-conditioner is characterized in that having: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge;
Detect the current sensing means of the revolution electric current of above-mentioned compressor;
Detect the high-pressure side refrigerant temperature checkout gear of temperature of the on high-tension side cold-producing medium of above-mentioned refrigerant circulation loop;
According to the testing result of above-mentioned current sensing means and above-mentioned high-pressure side refrigerant temperature checkout gear, judge the microcomputer of the operating condition of above-mentioned compressor; And
Receive the instruction of this microcomputer, drive the drive unit of above-mentioned compressor,
Temperature-resistantization that is detected at above-mentioned high-pressure side refrigerant temperature checkout gear and the detected value of above-mentioned current sensing means are under the situation below the high-pressure switch motion detection current value, and above-mentioned microcomputer concludes that the drive unit broken string or the line of above-mentioned compressor come off.
4. air-conditioner according to claim 3 is characterized in that: have according to the instruction from above-mentioned microcomputer, show the drive unit broken string of above-mentioned compressor or the display unit that line comes off.
5. an air-conditioner is characterized in that having: make the refrigerant circulation loop that circulates from condenser to evaporimeter from the cold-producing medium of compressor discharge;
Detect the current sensing means of the revolution electric current of above-mentioned compressor;
Detect the high-pressure side refrigerant temperature checkout gear of temperature of the on high-tension side cold-producing medium of above-mentioned refrigerant circulation loop;
According to the testing result of above-mentioned current sensing means and above-mentioned high-pressure side refrigerant temperature checkout gear, judge the microcomputer of the operating condition of above-mentioned compressor; And
Receive the instruction of this microcomputer, drive the drive unit of above-mentioned compressor,
The temperature that is detected at above-mentioned high-pressure side refrigerant temperature checkout gear rise change and also the detected value of above-mentioned current sensing means under the situation below the high-pressure switch motion detection current value, above-mentioned microcomputer concludes that above-mentioned current sensing means is unusual.
6. air-conditioner according to claim 5 is characterized in that: have according to the instruction from above-mentioned microcomputer, show the display unit that above-mentioned current sensing means is unusual.
7. according to claim 1,3 or 5 described air-conditioners, it is characterized in that above-mentioned current sensing means constitutes like this: make the wiring that becomes detected object pass toroidal core, according to the size of the electric current that flows through in the wiring, utilize the mutual inductance effect, change the size of induced electromotive force.
8. air-conditioner according to claim 5, it is characterized in that: the detected temperatures of above-mentioned high-pressure side refrigerant temperature checkout gear rise change and also the detected value of above-mentioned current sensing means under the situation below the high-pressure switch motion detection current value, above-mentioned microcomputer concludes that above-mentioned current sensing means normally is not arranged on the power line of above-mentioned compressor.
9. according to claim 3 or the described air-conditioner of claim 5, it is characterized in that: above-mentioned high-pressure side refrigerant temperature checkout gear detects the discharging refrigerant temperature of above-mentioned compressor.
10. according to claim 3 or the described air-conditioner of claim 5, it is characterized in that: above-mentioned high-pressure side refrigerant temperature checkout gear detects the temperature of above-mentioned condenser.
11. according to claim 3 or the described air-conditioner of claim 5, it is characterized in that: above-mentioned high-pressure side refrigerant temperature checkout gear detects the outlet temperature of above-mentioned condenser.
CNB001288830A 1999-09-24 2000-09-22 Air conditioner Expired - Lifetime CN1135337C (en)

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JP270362/1999 1999-09-24
JP27036299A JP3703346B2 (en) 1999-09-24 1999-09-24 Air conditioner

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EP1087184A2 (en) 2001-03-28
EP1087184B1 (en) 2005-05-04
EP1087184A3 (en) 2002-10-02
JP2001091022A (en) 2001-04-06
CN1292479A (en) 2001-04-25
JP3703346B2 (en) 2005-10-05

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