WO2004016998A1 - コンプレッサの冷媒漏れ検知装置 - Google Patents
コンプレッサの冷媒漏れ検知装置 Download PDFInfo
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- WO2004016998A1 WO2004016998A1 PCT/JP2003/002817 JP0302817W WO2004016998A1 WO 2004016998 A1 WO2004016998 A1 WO 2004016998A1 JP 0302817 W JP0302817 W JP 0302817W WO 2004016998 A1 WO2004016998 A1 WO 2004016998A1
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- Prior art keywords
- duty
- value
- drive value
- refrigerant
- drive
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Classifications
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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
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/12—Inflammable refrigerants
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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
- F25B2500/00—Problems to be solved
- F25B2500/19—Calculation of parameters
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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
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/221—Preventing leaks from developing
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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
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/222—Detecting refrigerant leaks
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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
- 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
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/24—Protection against refrigerant explosions
Definitions
- the present invention relates to a refrigerant leak detection device in a compressor of a refrigerator using a flammable refrigerant.
- an invention for detecting the leakage of combustible refrigerant when the drive circuit of the brushless DC motor that drives the compressor is driven by the PWM control, the load fluctuation of the refrigeration cycle is monitored and specified.
- a load fluctuation there has been proposed an invention that determines that refrigerant is leaking, stops energization of components such as electrical components, and reduces the risk of ignition of flammable refrigerants (for example, Japanese Patent Application No. 20-210). 0 2-0 1 0 8 1 7).
- the load of the compressor that supplies the flammable refrigerant to the refrigerant flow path fluctuates greatly, and this load fluctuation is reduced by the duty of the PWM controlled compressor. It is determined by measuring the value, and when the rate of change of the duty value fluctuates within a predetermined range, it is determined that there is leakage of the flammable refrigerant.
- the duty value changes regardless of the load fluctuation of the refrigeration cycle, and the flammability is actually increased. Even if refrigerant leakage has not occurred, erroneous detection may be triggered by leakage of flammable refrigerant from a change in the duty value.
- the present invention has been made in view of the above-described problems, and has been developed in consideration of the above problems. To provide.
- the invention of claim 1 is a compressor for supplying a compressed flammable refrigerant to a refrigeration cycle of a refrigerator, a brushless DC motor for driving the compressor, and a drive signal to the brushless DC motor.
- a refrigerant leakage detection device for a compressor comprising: a switching circuit to be supplied; a control unit that performs PWM control of the switching circuit; and a DC power supply unit that supplies DC power for driving the switching circuit.
- a duty measuring means for measuring a duty value of the PWM signal in the control means, a driving value measuring means for measuring a driving value of a voltage, current, power, etc.
- the duty value measured by the duty measuring means is the duty measured at the duty measurement time.
- Duty determining means for determining whether or not a duty-variation range based on a drive value has been exceeded; and a time change per unit time of a drive value measured at a drive value measurement reference time by the drive value measuring means.
- Drive value determining means for determining whether the rate exceeds a drive value reference change rate, and the duty value determining means determines that the duty exceeds the fluctuation range, and the drive value determining means determines the drive value reference value.
- the duty determination means determines that the duty exceeds one fluctuation range, and the drive value determination change rate determines the drive value reference change rate.
- Refrigerant leakage determining means for determining that no flammable refrigerant has leaked when it is determined that refrigerant gas has exceeded refrigerant refrigerant leakage. It is a detection device.
- the invention of claim 2 is the refrigerant leakage detection device for a compressor according to claim 1, wherein the duty-one measurement reference time and the drive value measurement reference time are set at different times.
- the invention according to claim 3 is a compressor that compresses and supplies a combustible refrigerant to a refrigeration cycle of a refrigerator, a brushless DC motor that drives the compressor, and a switching circuit that supplies a drive signal to the brushless DC motor.
- the switching A refrigerant leakage detection device for a compressor, comprising: a control unit for performing a PWM control of a circuit; and a DC power supply unit for supplying a DC power supply for driving to the switching circuit, wherein a duty of a PWM signal in the control unit is provided.
- a drive value determining means for determining whether or not a drive value fluctuation range based on a drive value measured at the measurement reference time has been exceeded; It is determined that the flammable refrigerant has leaked when the duty-one determination means determines that the duty-per-hour rate of change has been exceeded and the drive value determination means determines that the drive value fluctuation width does not exceed, and Refrigerant leak determining means for determining that the flammable refrigerant has not leaked when the duty determining means determines that the duty time change rate has been exceeded and when the drive value determining means has determined that the drive value fluctuation range has been exceeded.
- a refrigerant leak detection device for a compressor comprising:
- the invention according to claim 4 is the refrigerant leakage detection device for a compressor according to claim 3, wherein the duty-one measurement reference time and the drive value measurement reference time are set at different times.
- the invention according to claim 5 is a compressor that compresses and supplies a flammable refrigerant to a refrigeration cycle of a refrigerator, a brushless DC motor that drives the compressor, and a switching that supplies a drive signal to the brushless DC motor.
- a refrigerant leakage detection device for a compressor comprising: a circuit; and a control means for performing PWM control on the switching circuit, wherein a duty measurement means for measuring a duty value of a PWM signal in the control means; First duty determining means for determining whether or not the duty value measured by the duty one measuring means has exceeded a duty fluctuation range based on the duty value measured at the first duty measuring reference time; And the duty value per unit time measured at the second duty-one measurement reference time by the duty measuring means.
- the first duty determining means determine that the duty-variable range has been exceeded, and that the second duty determining means does not exceed the duty-reference change rate.
- the first duty determining means has determined that the duty-variation range has been exceeded, and the second duty-determining means has determined that the duty reference change rate has been exceeded.
- a refrigerant leakage determination unit that determines that no flammable refrigerant is leaking.
- the invention of claim 6 is the compressor leakage detection device according to claim 5, wherein the first duty-one measurement reference time and the second duty-one measurement reference time are set at different times. .
- the invention according to claim 7 provides a compressor that compresses and supplies a flammable solvent to a refrigeration cycle of a refrigerator, a brushless DC motor that drives the compressor, and a drive signal that supplies a brushless DC motor to the refrigerator.
- a refrigerant leak detection device for a compressor comprising: a switching circuit; control means for performing PWM control of the switching circuit; and DC power supply means for supplying DC power for driving the switching circuit.
- a drive value measuring means for measuring a drive value such as a voltage, a current, and an electric power of the DC power supply supplied by the supply means, and a drive value measured by the drive value measuring means is measured at a first drive value measurement reference time.
- First drive value determining means for determining whether or not a drive value variation range based on the measured drive value has been exceeded, and second drive value measurement by the drive value measuring means.
- a second drive value determining means for determining whether a time change rate per unit time of the drive value measured at the reference time exceeds the drive value reference change rate, and a drive value variation width in the first drive value determination means.
- the first drive value determination means drives Refrigerant leakage determining means for determining that the flammable refrigerant is not leaking when it is determined that the value fluctuation range has been exceeded and when the second drive value determining means determines that the drive value reference change rate has been exceeded.
- This is a compressor leakage detecting device for a compressor.
- the invention of claim 8 wherein the first drive measurement reference time and the previous second drive value measurement reference time 8.
- the flammable refrigerant is used when the duty-one determining means determines that the duty-variation width has been exceeded and the drive-value determining means determines that the drive-value-based change rate does not exceed the reference value. Is determined to have leaked. On the other hand, if the measured drive value based on the drive value reference change rate exceeds the drive value, the duty value is changed by the DC power supply means, and it is determined that the flammable refrigerant is not leaking.
- the flammable refrigerant has leaked when it is detected.
- the first duty determination means determines that the duty-variation range has been exceeded and the second duty-determination means determines that the duty-reference change rate has been exceeded, the flammable refrigerant leaks. It is determined that there is not.
- the first drive value determination means determines that the drive value fluctuation range is exceeded and the second drive value determination means determines that the drive value reference change rate is not exceeded. Is determined when the flammable refrigerant has leaked. On the other hand, when the first drive value determination means determines that the drive value fluctuation range has been exceeded and the second drive value determination means determines that the drive value reference change rate has been exceeded, the flammable refrigerant has leaked. It is determined that there is not.
- FIG. 1 is a longitudinal sectional view of a refrigerator showing one embodiment of the present invention.
- FIG. 2 is a block diagram of the refrigeration cycle of the refrigerator.
- FIG. 3 is a block diagram of a motor driving device in a refrigerator.
- FIG. 4 is a waveform diagram of each signal in the driving device.
- FIG. 5 is a flowchart showing detection of the duty value D (t) and the voltage value V (t).
- FIG. 6 is a graph showing the relationship between the single duty value D (t) and the time in the upper part, and the graph showing the relationship between the voltage value V (t) of the DC power supply and the time in the lower part.
- FIG. 7 is a flowchart of a process for determining whether there is a refrigerant leak.
- FIG. 1 is a sectional view of an intercooled refrigerator 1 according to the present embodiment.
- a refrigerator room 2 Inside the refrigerator 1, a refrigerator room 2, a vegetable room 3, a switching room 4, and a freezing room 5 are provided from the top. An ice-making room (not shown) is provided beside the switching room 4 as a part of the freezing room 5.
- a compressor room 12 and a blower fan 29 for a condenser are provided in a machine room 6 behind the freezer room 5.
- a freezing room evaporator (hereinafter referred to as F eva) 26 for cooling the switching room 4 and the freezing room 5 is provided on the back side of the switching room 4. Further, on the back of the switching room 4, a switching room damper 8 for adjusting the flow rate of the cool air from the F-eva 26 to adjust the temperature inside the switching room 4 to a set temperature is arranged.
- F eva freezing room evaporator
- a refrigerator compartment evaporator (hereinafter referred to as R-eva) 18 for cooling the refrigerator compartment 2 and the vegetable compartment 3 is provided.
- a blower fan (hereinafter, referred to as an F fan) 28 for blowing the cool air cooled by the F eva 26 to the switching room 4 and the freezing room 5 is provided above the F eva 26.
- R Eva 18 the cold air cooled by R Eva 18 is sent to refrigerator compartment 2 and vegetable compartment 3.
- a blower fan (hereinafter referred to as R fan) 20 for blowing air is provided.
- a deodorizing device 32 is provided on the partition plate 30 of the refrigerator compartment 2 and the vegetable compartment 3.
- a main control unit 7 composed of a microcomputer is provided. The main controller 7 controls the compressor 12, the R fan 20, the F-an 28, and a three-way valve 22, which will be described later.
- the operation unit 9 of the main control unit 7 is provided in front of the door of the refrigerator compartment 2.
- FIG. 2 shows a refrigeration cycle 10 of the refrigerator 1.
- the refrigerant flow path is switched by the refrigerant switching mechanism of the three-way valve 22.
- the one-way outlet of the three-way valve 22 is connected to the cold storage tube 16 and the R-eva 18 in order, the other outlet of the three-way valve 22 is connected to the free-side cavity tube 24, and the R-eva 18 It merges with the outlet pipe and is connected to the inlet side of F-eva 26.
- the outlet pipe of the Feva 26 is connected to the suction side of the compressor 12.
- the alternate cooling operation means that the high-temperature refrigerant compressed and pressurized by the compressor 12 is radiated by the condenser 14, and the refrigerant discharged from the refrigerant enters the three-way valve 22, cools the R-eva 18 or F 26, and
- R mode the refrigeration / cooling mode
- F mode the refrigeration / cooling mode
- the three-way valve 22 is switched, the refrigerant flows through the refrigerator tube 16, evaporates at the R evaporator 18, and the cool air is sent to the refrigerator compartment 2 and the vegetable compartment 3 by the R fan 20 for cooling. .
- the three-way valve 22 is switched, and the refrigerant is The refrigerant flow path is switched so that the refrigerant flows, and the refrigerant evaporates in the fuel evaporator 26 and returns to the compressor 12.
- the cool air in F-eva 26 is sent to freezing room 5 by F fan 28
- the mode is switched at predetermined time intervals, or when the temperature in the refrigerator 2 becomes higher than the upper limit temperature in the refrigerator, or when the refrigerator is frozen.
- Each mode is started when the inside temperature of the room 5 becomes higher than the inside upper limit temperature.
- the compressor 12 stops.
- the compressor 12 is a reciprocating compressor and is driven by a series-wound three-phase brushless DC motor 101.
- the drive device 100 of the brushless DC motor (hereinafter simply referred to as motor) 101 will be described with reference to FIGS.
- the structure of the driving device 100 will be described based on the circuit diagram of FIG.
- the driving device 100 is roughly divided into a switching circuit 102, a voltage doubler rectifier circuit 103, an AC power supply 104, a gate drive circuit 105, a position detection circuit 106, a motor control unit 107, a current limit detection circuit 108, and a voltage detection circuit 150. Consisting of This driving device 100 is configured to generate a DC power supply 280 V from an AC power supply 104 of AC 100 V by a voltage doubler rectifier circuit 103 and drive a motor 101 by a switching circuit 102.
- the switching circuit 102 composed of one three-phase bridge driver has the following configuration.
- Two NPN-type switching transistors Tr 1 and Tr 4 are connected in series, and diodes 118 and 121 are connected between the respective collector terminals and the emitter terminals of the switching transistors Tr 1 and Tr 4. Are connected to form one series circuit are doing.
- one series circuit is composed of the switching transistors Tr2 and Tr5 and the diodes 119, 122, and one series circuit is composed of the switching transistors Tr3 and Tr6 and the diodes 120 and 123.
- Three series circuits are connected in parallel.
- Each of the Y-connected stator windings 101 u, v, of the motor 101 is connected to two switching transistors Tr 1, Tr 4 and Tr 2, Tr 5 and ⁇ ⁇ 3, Tr 6 of the respective series circuits. Connected to points 125U, 125V, 125w.
- the voltage doubler rectifier circuit 103 converts AC 100 to 0 to 280 V. After full-wave rectification is performed by a pre-charge circuit 109 composed of diodes, the smoothing capacitors 110 and 111 Double voltage.
- the gate drive circuit 105 generates and outputs gate signals to the gate terminals of the six switching transistors Tr 1 to Tr 6 of the switching circuit 102 based on a conduction signal based on the PWM signal from the motor control unit 107.
- the position detection circuit 106 detects the drive current flowing through the stator winding of each phase, and branches the detection line from the stator windings 101u, 101V, 101w of each phase.
- the detection lines 130 and 131 are connected in series to the detection line branched from the u phase, and then grounded.
- the detection resistors 132, 133 are also connected in series to the V phase and then grounded.
- the detection resistors 134 and 135 are connected in series and grounded.
- Two resistors 128, 130 are connected between the emitter-side terminals of the three switching transistors Tr1, Tr2, Tr3 and the collector-side terminals of the switching transistors Tr4, Tr5, Tr6. Is connected, and an intermediate detection line for taking the DC intermediate voltage is drawn from the connection point of these resistors 128 and 130.
- the above-mentioned intermediate voltage detection line is connected to one terminal side, and a line for taking the voltage between the detection resistors 130 and 131 in the u-phase detection line is connected to the + terminal. Connected.
- the V-phase comparison 13 In the 7th and w-phase comparators 138, the DC Zhonglu voltage line and the detection lines of each phase are connected to one terminal side and + terminal side.
- the outputs of the three comparators 136, 137, and 138 are connected to the input terminals of the controller 107.
- the output from this comparator will be referred to as position signals Pul.PV1 and Pwl.
- the current limit detection circuit 108 detects a current flowing through the shunt resistor 140 provided between the voltage doubler rectifier circuit 103 and the switching circuit 102, and limits the output when the current exceeds a threshold value. Is output to the control unit 107.
- the voltage detection circuit 150 detects a voltage value of the DC voltage output from the voltage doubler rectification circuit 103, and the detected voltage value is output to the motor control unit 107.
- the motor control unit 107 which is composed of a microcomputer, receives an energization signal by PWM control based on the position signal from the position detection circuit 106, the limit instruction signal from the current limit detection circuit 108, and the speed command signal from the main control unit 7 of the refrigerator 1. Is generated and output to the gate drive circuit 105. That is, the driving is performed overnight.
- the motor control unit 107 is provided with a ROM 127b and a RAM 127a for storing data.
- the operating state of the driving device 100 will be described with reference to FIGS.
- the rotor position detection of the motor 101 is a method of detecting the induced voltage generated in the non-conducting phase in the 120 ° energized rectangular wave driving method, and the stator windings 101 1 u, 10 lv, 101
- the voltage based on the drive current of w and the intermediate voltage of DC 280 V are divided and compared by the comparators 136 to 138 and input to the motor controller 107 as the position signals Pu 1.PV 1 and Pw 1 .
- This position signal Pu l. Pv l, Pw 1 is the reference signal for turning the motor 101
- the motor control unit 107 converts these signals based on the position signals Pu1, PV1, and Pwl of the comparators 1336 to 1338.
- the position signals Pu2, PV2, and Pw2 corrected by shifting the phase by 30 ° are generated.
- These phase-corrected position signals are converted into logic to generate energization signals.
- the PWM signal is omitted in FIG. 4, for example, the PWM signal is combined with the PWM signal of the switching transistor on the high side, that is, on the upstream side, to adjust the voltage, and to adjust the rotational speed.
- An energization signal based on the signal is output.
- the electrical angle is 60 as shown in (a) to (d) of FIG. Since the signal changes from high to low or from low to high each time, this time is measured each time, and half of the time is set to 30 ° of the electrical angle, and phase shift, that is, commutation is performed.
- the current limit in the current limit detection circuit 108 is converted into a voltage by the shunt resistor 140, compared with the reference voltage in the comparator inside the current limit detection circuit 108, and when the current exceeds the threshold, The motor control unit 107 cuts the 0 N period of the PWM signal.
- the motor control unit 107 in the driving device 100 also detects refrigerant leakage of combustible refrigerant. A configuration for detecting the leakage of the flammable refrigerant will be described.
- the position of the leak greatly differs between the high pressure side and the low pressure side of the refrigeration cycle 10.
- the temperature of FEV 26 is from 118 ° C to 126 ° C.
- C is the boiling point of isobutane. C (1 atm) or less.
- R eva 18 the temperature of the refrigerator 2 approaches the boiling point when the refrigerator 2 is cooled. Therefore, if pinholes or cracks occur in the F-eva 26 or R-eva 18 inside the chamber (low-pressure side), the refrigerant is hardly released to the atmosphere during the start-up operation. Rather, outside air is drawn into the refrigeration cycle.
- the refrigerant pressure is higher than the atmospheric pressure.
- similar pinholes and cracks are generated on the high pressure side, so that the refrigerant immediately leaks from the perforated portion, and the refrigerant pressure in the refrigerant flow path decreases.
- the refrigerant In order to reliably determine the leakage of the flammable refrigerant when such a flammable refrigerant leaks or is likely to occur, the refrigerant is divided into the high pressure side and the low pressure side of the refrigeration cycle 10 and A corresponding determination method is required. Therefore, in consideration of this point, the refrigerant leakage is determined based on one duty value for controlling the compressor 12.
- the duty value of the compressor 12 is, as described above,
- the motor 101 is controlled by a PWM signal.
- the ratio between the ON period and the OFF period of this PWM signal is called a duty value. For example, if the duty value is 100%, The power is full power because the ON period is 100%, half power when the ON period is 50%, and stops when the ON period is 0% because the ON period is zero.
- This duty value depends on the rotation speed of the motor 101 and the load, but even if the load is constant, the duty value changes with the operating frequency (rotation speed), and the load changes.
- the degree of change of the duty value with respect to varies with the operating frequency.
- load fluctuation can be observed regardless of the operating frequency.
- a (t) D (t 0) -D (t) ⁇ ⁇ (1)
- a (t) is the duty fluctuation range at the inspection time t
- D (t 0) is the duty measurement reference time
- the duty value at t0, D (t) is the duty value at the inspection time t.
- the calculated duty fluctuation width A (t) exceeds the predetermined reference duty fluctuation width Aa. In this case, it can be determined that there is a refrigerant leak.
- the method of obtaining this reference duty one value D (t0) is as follows.When the operation of the refrigeration cycle 10 changes or after the operating frequency of the compressor 12 is switched, the duty value D ( The duty value D (to) at time t0 when t) changes is set as the reference duty value. Details will be described later.
- the refrigeration cycle 10 draws in air from the pressure difference with the atmosphere, and the pressure inside the refrigeration cycle 10 increases. Then, a load is applied to the compressor 12 as the pressure increases, and the duty value D (t) increases.
- the duty value D (t) of the compressor 12 is reduced.
- the duty value changes, but also when the voltage value of the DC power source changes, the duty value also changes.
- the relationship between the DC 280V and the duty value is such that the duty value increases as the voltage value decreases, and the duty value decreases as the voltage value increases.
- the refrigerant for preventing the output value of the voltage doubler rectifier circuit 103 that is, the change in the duty value due to the change in the voltage value of the DC power supply from being erroneously detected as a refrigerant leak.
- the leak detecting means will be described below. (5-3) Details of refrigerant leak detection
- step 1 Measurement of one duty value D (t) and voltage value of DC power supply V (t)
- Fig. 5 shows measurement of one duty value D (t) and voltage value of DC power supply V (t). It is a flowchart for performing. Hereinafter, description will be made based on this flowchart.
- step 1 the duty value D (t) and the current value are measured every 16 seconds, so if 16 seconds have elapsed, proceed to step 2; otherwise, continue counting for 16 seconds.
- step 2 the duty value D (t) and the voltage value V (t) are sampled.
- the motor control section 107 samples the duty value D (t) because the duty value D (t) of the currently output PWM signal is known.
- the current voltage value V (t) is sampled based on the output from the circuit 150. Then go to step 3.
- step 3 in order to calculate the average value for one minute, it is determined whether or not one minute has elapsed. If one minute has not elapsed, the process returns to step 1, and if one minute has elapsed, Go to step 4.
- step 4 the average value of the duty value D (t) and the voltage value V (t) measured during one minute is calculated. That is, since the duty one value D (t) and the voltage value V (t) are sampled every 16 seconds, it is possible to sample three times in one minute. Calculate the average value of the voltage value V (t) and proceed to step 5.
- step 5 the process returns to step 1 if sampling of the duty value D (t) and the voltage value V (t) is continued, and ends if sampling is stopped.
- the duty value D (t) and the current value every 16 seconds can be sampled, and the average value at one minute intervals can be calculated. It is assumed that the sampling of the duty one value D (t) and the voltage value V (t) is always continued irrespective of the driving state of the compressor 12 and the like. When the power is turned off, the process ends.
- Fig. 6 shows that when the refrigerant leaks on the low pressure side, the duty value D (t) rises and the voltage increases. This is an explanation when the value V (t) drops, and the upper graph in FIG. 6 shows the temporal change of the duty value D (t), and the duty per minute as described above. The average value of one value D (t) is indicated by a black circle. In addition, the lower part of FIG. 6 shows a temporal change of the voltage value V (t), and the average value of the voltage value V (t) for one minute is indicated by a black circle.
- the time of the change is set as the duty measurement reference time t0.
- the motor control unit 107 stores the duty value D (t 0) at the time t 0 in the RAM 127 a as a reference duty value, and updates the value each time there is a change.
- the change can be the following cases.
- step 11 it is determined whether or not the inspection time is the duty value D (t).
- the test of this duty value; D (t) is performed every minute.
- step 12 the average value of the duty value D (t) at the inspection time t calculated in the flowchart of FIG. 6 is extracted.
- step 13 the average value of the duty value D (t) is increased, and it is determined whether or not the duty fluctuation width A (t) described above exceeds the reference duty fluctuation width Aa. For example, it is determined in Step 1 that there is no refrigerant leakage. On the other hand, if it exceeds, it is determined that there is a possibility of refrigerant leakage, and the process proceeds to step 14.
- step 14 the average value of the voltage value V (t) at the inspection time t is extracted, and the voltage of the unit time before the inspection time t-1 (specifically, one minute before) is extracted.
- the average of the value V (t-1) is extracted, and the time change rate ⁇ per unit time (per minute) is calculated.
- step 15 when the voltage value V (t) decreases and the time change rate AV exceeds the voltage value reference change rate ⁇ a as shown by the solid line at the bottom of FIG. 6, that is, when AV> AVa Then, it is determined that the DC power supply (the output of the voltage doubler rectifier circuit 103) is fluctuating and no refrigerant leakage has occurred, and the process proceeds to step S17.
- time t8 is the measurement reference time.
- the time change rate ⁇ V of the voltage value V (t) does not exceed the voltage value reference change rate a as shown by the dotted line in FIG.
- step 16 the controller 107 determines that there is a refrigerant leak, outputs a refrigerant leak detection signal to the main controller 7, stops all the driving of the refrigerator 1, and sends the user a Inform
- the duty value D (t ) Since not only the duty fluctuation width of the duty value D (t) but also the time change rate ⁇ of the voltage value V (t) is detected, the duty value D (t ) Does not erroneously be judged as a refrigerant leak, and the refrigerant leak can be accurately judged.
- the duty measurement reference time of the duty value D (t) is at t0, and the measurement reference time for checking the time change rate of the voltage value V (t) is at t8. By changing the measurement reference time in this way, refrigerant leakage can be detected. (5-3-3-2-3) Processing when refrigerant leaks on the high pressure side
- Fig. 5 describes the case where a refrigerant leak occurs on the low pressure side, the duty value D (t) increases, and the voltage value V (t) decreases, but conversely, a refrigerant leak occurs on the high pressure side. Then, when the duty value D (t) decreases and the voltage value V (t) increases, it can be detected in the same manner.
- duty fluctuation width A in the above embodiment is defined by the expression (1), it may be defined by the following expression (2) instead.
- a (t) (D (t 0) -D (t)) / D (t 0)
- a (t) is the duty fluctuation width at the inspection time t
- D (t 0) is the duty-one value at the measurement reference time t
- D (t) is the duty value at the inspection time t It is.
- the duty value D (t) is detected by the duty-variation range A, and the voltage value V (t) is detected by the time-change rate ⁇ . Is calculated by the rate of change of time, and the voltage value V (t) is calculated by
- the time change rate of the duty one value D (t) and the duty one fluctuation width may be detected to determine whether there is a refrigerant leak.
- the voltage value fluctuation range of the voltage value V (t) and the time rate of change ⁇ may be simultaneously detected to determine whether there is a refrigerant leak.
- the time of the voltage value V (t) detected by the voltage detection circuit 150 is determined by the same control based on the time rate of change ⁇ I of the current value detected by the current limit detection circuit 108 and the current value fluctuation range. May be performed.
- the power value P (t) V (t) XI obtained by multiplying the current value I (t) detected by the drive current limit detection circuit 108 and the voltage value V (t) detected by the voltage detection circuit 150 (t) may be used for the determination.
- the change in the duty value is a change based on a change in the DC power supply.
- the refrigerant leak detection device of the compressor in a refrigerator, it is possible to reliably detect a refrigerant leak in the refrigerator.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/522,145 US7181954B2 (en) | 2002-08-19 | 2003-03-10 | Refrigerant leak detector compressor |
| EP03708533A EP1531310A4 (en) | 2002-08-19 | 2003-03-10 | REFRIGERANT DETECTION DEVICE FOR COMPRESSOR |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002/238667 | 2002-08-19 | ||
| JP2002238667A JP4028779B2 (ja) | 2002-08-19 | 2002-08-19 | コンプレッサの冷媒漏れ検知装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004016998A1 true WO2004016998A1 (ja) | 2004-02-26 |
Family
ID=31884465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2003/002817 Ceased WO2004016998A1 (ja) | 2002-08-19 | 2003-03-10 | コンプレッサの冷媒漏れ検知装置 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7181954B2 (ja) |
| EP (1) | EP1531310A4 (ja) |
| JP (1) | JP4028779B2 (ja) |
| CN (1) | CN1318810C (ja) |
| TW (1) | TWI228584B (ja) |
| WO (1) | WO2004016998A1 (ja) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1783442A1 (en) * | 2004-07-16 | 2007-05-09 | Daikin Industries, Ltd. | Air-conditioning apparatus |
| KR100730186B1 (ko) * | 2005-12-15 | 2007-06-19 | 삼성에스디아이 주식회사 | 유기 박막 트랜지스터의 제조방법 |
| JP4860379B2 (ja) * | 2006-07-07 | 2012-01-25 | ミネベアモータ株式会社 | ブラシレスモータ駆動回路及びこれを備えるモータ |
| US7672107B2 (en) * | 2006-10-13 | 2010-03-02 | Advanced Analogic Technologies, Inc. | Current limit control with current limit detector |
| US7532448B2 (en) * | 2006-10-13 | 2009-05-12 | Advanced Analogic Technologies, Inc. | Current limit detector |
| US7957116B2 (en) | 2006-10-13 | 2011-06-07 | Advanced Analogic Technologies, Inc. | System and method for detection of multiple current limits |
| KR100850670B1 (ko) * | 2007-03-29 | 2008-08-07 | 엘지전자 주식회사 | 냉장고 및 그 동작방법 |
| US9970698B2 (en) | 2011-10-24 | 2018-05-15 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
| US9605884B2 (en) | 2011-10-24 | 2017-03-28 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
| EP2803921B1 (en) * | 2011-12-14 | 2020-04-22 | Mitsubishi Electric Corporation | Heat pump device, and air conditioner, heat pump/hot-water supply machine, refrigerator, and freezer equipped with same |
| US9465370B2 (en) | 2012-06-26 | 2016-10-11 | Johnson Controls Technology Company | HVAC actuator with soft stall control |
| US9641122B2 (en) | 2012-06-26 | 2017-05-02 | Johnson Controls Technology Company | HVAC actuator with automatic end stop recalibration |
| US8947031B1 (en) * | 2012-06-26 | 2015-02-03 | Johnson Controls Technology Company | Systems and method for speed and torque control of a DC motor |
| US20140250925A1 (en) * | 2013-03-06 | 2014-09-11 | Esco Technologies (Asia) Pte Ltd | Predictive Failure Algorithm For Refrigeration Systems |
| KR102220911B1 (ko) * | 2014-01-06 | 2021-02-25 | 엘지전자 주식회사 | 냉장고, 및 홈 어플라이언스 |
| KR102173371B1 (ko) * | 2014-01-06 | 2020-11-03 | 엘지전자 주식회사 | 냉장고, 및 홈 어플라이언스 |
| US10199962B2 (en) | 2015-03-18 | 2019-02-05 | Johnson Controls Technology Company | Plug and play universal input actuator |
| JPWO2016157538A1 (ja) * | 2015-04-03 | 2017-04-27 | 三菱電機株式会社 | 冷凍サイクル装置 |
| KR101998570B1 (ko) * | 2015-05-20 | 2019-07-10 | 삼성전자주식회사 | 냉장고 |
| US10094736B2 (en) * | 2015-07-16 | 2018-10-09 | Schneider Electric USA, Inc. | Method for detecting compressed air system leakage |
| WO2017199340A1 (ja) * | 2016-05-17 | 2017-11-23 | 三菱電機株式会社 | 空気調和機 |
| CN107036354B (zh) * | 2017-05-25 | 2019-05-07 | 绵阳美菱软件技术有限公司 | 一种空调器漏氟的检测方法、装置以及空调系统 |
| CN110895019B (zh) * | 2018-09-12 | 2021-03-12 | 奥克斯空调股份有限公司 | 一种空调冷媒泄漏检测方法及使用该方法的空调 |
| US11231198B2 (en) | 2019-09-05 | 2022-01-25 | Trane International Inc. | Systems and methods for refrigerant leak detection in a climate control system |
| CN112179592B (zh) * | 2020-09-02 | 2022-05-24 | 四川虹美智能科技有限公司 | 制冷系统检测方法、装置和可读介质 |
| US12487008B2 (en) | 2022-01-14 | 2025-12-02 | Trane International Inc. | Method of commissioning an HVAC system |
| US12117191B2 (en) | 2022-06-24 | 2024-10-15 | Trane International Inc. | Climate control system with improved leak detector |
| CN115218442A (zh) * | 2022-07-14 | 2022-10-21 | 青岛海尔空调器有限总公司 | 用于空调器的控制方法及装置、空调器、存储介质 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07337081A (ja) * | 1994-06-10 | 1995-12-22 | Toshiba Corp | インバータ装置およびエアコンディショナ |
| JP2001165552A (ja) * | 1999-12-08 | 2001-06-22 | Mitsubishi Electric Corp | 冷蔵庫 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0359371A (ja) * | 1989-07-27 | 1991-03-14 | Toshiba Corp | 冷凍サイクルの冷媒漏洩検出装置 |
| JPH0455671A (ja) * | 1990-06-26 | 1992-02-24 | Toshiba Corp | 冷凍サイクル装置 |
| JPH08126377A (ja) * | 1994-10-19 | 1996-05-17 | Fujitsu General Ltd | モータの制御方法 |
| JPH08168287A (ja) * | 1994-12-09 | 1996-06-25 | Fujitsu General Ltd | モータの制御方法 |
| US6047557A (en) * | 1995-06-07 | 2000-04-11 | Copeland Corporation | Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| JPH10122711A (ja) * | 1996-10-18 | 1998-05-15 | Matsushita Electric Ind Co Ltd | 冷凍サイクル制御装置 |
| JP3456902B2 (ja) * | 1998-09-08 | 2003-10-14 | 株式会社東芝 | 冷蔵庫 |
| JP2000146429A (ja) * | 1998-11-05 | 2000-05-26 | Hitachi Ltd | 冷凍装置 |
| JP3708405B2 (ja) * | 2000-06-19 | 2005-10-19 | 三菱電機株式会社 | 可燃性冷媒使用の家電機器 |
| JP2002039649A (ja) * | 2000-07-24 | 2002-02-06 | Funai Electric Co Ltd | 空気調和機の運転警報装置 |
| JP2002099535A (ja) * | 2000-09-26 | 2002-04-05 | Nec Corp | 組織間のデータベース情報変更方式 |
| JP2003042655A (ja) * | 2001-07-27 | 2003-02-13 | Toshiba Corp | 冷蔵庫 |
| JP2003214734A (ja) * | 2002-01-18 | 2003-07-30 | Toshiba Corp | 冷凍冷蔵庫の制御装置及び冷凍冷蔵庫の冷媒漏れ判定方法 |
| JP3999961B2 (ja) * | 2001-11-01 | 2007-10-31 | 株式会社東芝 | 冷蔵庫 |
-
2002
- 2002-08-19 JP JP2002238667A patent/JP4028779B2/ja not_active Expired - Fee Related
-
2003
- 2003-03-10 CN CNB038063719A patent/CN1318810C/zh not_active Expired - Fee Related
- 2003-03-10 WO PCT/JP2003/002817 patent/WO2004016998A1/ja not_active Ceased
- 2003-03-10 EP EP03708533A patent/EP1531310A4/en not_active Withdrawn
- 2003-03-10 US US10/522,145 patent/US7181954B2/en not_active Expired - Fee Related
- 2003-04-16 TW TW092108799A patent/TWI228584B/zh not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07337081A (ja) * | 1994-06-10 | 1995-12-22 | Toshiba Corp | インバータ装置およびエアコンディショナ |
| JP2001165552A (ja) * | 1999-12-08 | 2001-06-22 | Mitsubishi Electric Corp | 冷蔵庫 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP1531310A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004077030A (ja) | 2004-03-11 |
| JP4028779B2 (ja) | 2007-12-26 |
| US20060162427A1 (en) | 2006-07-27 |
| EP1531310A1 (en) | 2005-05-18 |
| CN1318810C (zh) | 2007-05-30 |
| US7181954B2 (en) | 2007-02-27 |
| TW200403419A (en) | 2004-03-01 |
| EP1531310A4 (en) | 2008-04-09 |
| TWI228584B (en) | 2005-03-01 |
| CN1643316A (zh) | 2005-07-20 |
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