JP2007139224A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner, capable of preventing damage and failure of electrical components and the like, resulting from abnormality of a switch means, and improving durability, making the supply to power to the electrical components stopped promptly, by promptly detecting the abnormality in the switching means. <P>SOLUTION: This air conditioner comprises a power source device 6, supplying electric power to a starter 5 or the like for starting a gas engine 1 that is utilized as a power source of a compressor 33 disposed in the air conditioner, relays 7a, 7b disposed on a passage connecting the power source device 6 and the starter 5 or the like, for supplying/cutting off the electric power to the starter 5 or the like, a leakage breaker 9 cutting off the power supply from the power source device 6, an abnormality detecting portion 101 detecting abnormality of the relays 7a, 7b, and a leaked electric current outputting portion 102 supplying the leaked electric current to the leakage breaker 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner.

Conventionally, in an air conditioner, various operation control methods and operation control devices have been proposed in order to improve the durability of components.
For example, Japanese Patent Laid-Open No. 2002-155840 discloses a gas heat pump type air conditioner that uses a gas engine as a power source for a compressor to improve the durability of an engine starter motor (hereinafter simply referred to as “starter”). In order to ensure, an engine operating method is disclosed in which the temperature of the starter is measured every time the gas engine is started, and the starter operating time is determined based on the measured temperature.
JP 2002-155840 A

A plurality of electric components (for example, a fan, a compressor, a solenoid valve, etc.) provided in an air conditioner such as the starter described above are usually supplied with power from a commercial power source or a power supply device built in the electric conditioner. Made. In order to maintain / shut off the power supply, a switch means such as a relay is provided in an electrical path connecting the power supply device and the electrical component. This switch means is appropriately on / off controlled by the control device of the air conditioner.
By the way, when an abnormality such as welding occurs in the switch means such as the relay, power supply to the electrical components is maintained against a control command from the control device.
However, the conventional air conditioner does not have an effective means for quickly shutting off the power supply to the electrical component when the abnormality of the switch means is detected. There was a problem of causing failure.

  The present invention has been made to solve the above-described problems. When an abnormality such as welding occurs in a switch means such as a relay, the abnormality is promptly detected, and the power supply to the electrical component is promptly stopped. It is an object of the present invention to provide an air conditioner that can prevent damage and breakdown of electrical components and improve the durability of the components.

In order to solve the above problems, the present invention employs the following means.
The present invention provides a power supply device that supplies power to at least one electrical component, and a switch unit that is provided in a path connecting the power supply device and the electrical component, and that switches on / off power to the electrical component. And, when an abnormality signal is input, a blocking means for cutting off power supply from the power supply device, an abnormality detection means for detecting an abnormality in the switch means, and an abnormality in the switch means are detected, An air conditioner including an abnormal signal output unit that outputs the abnormal signal to the blocking unit is provided.

  According to the above configuration, when an abnormality occurs in the switch means for turning on / off the electric power to the electrical component, the abnormality is detected by the abnormality detection means, and the abnormality signal is output from the abnormality signal output means to the interruption means. The power supply from the power supply device is interrupted by the interrupting means. As a result, when an abnormality occurs in the switch means, it is possible to quickly stop the power input to the electrical component, so that damage or failure of the electrical component can be prevented.

  The interruption means is, for example, an earth leakage breaker that interrupts power supply from the power supply device when a current exceeding a specified value is input. As described above, when the breaker is employed as the shut-off means, it is only necessary to pass a current exceeding a specified value as the abnormal signal, so that the abnormal signal output means can have a very simple circuit configuration.

  In the air conditioner, the electrical component is, for example, at least one of a starter for starting a gas engine and a gas shut-off valve for shutting off a gas supplied to the gas engine, and the abnormality detection means is For example, when the engine is rotating and no operation command is issued to the starter and the gas supply valve, an abnormality of the switch means is detected.

  In the case of a gas heat pump type air conditioner that uses a gas engine as a power source for the compressor, the path connecting the starter and the power supply for starting the gas engine and the flow rate of the gas supplied to the gas engine are adjusted. The switch means is provided in the path | route which connects the gas supply valve for performing and a power supply device. When an abnormality occurs in any of the switch means, power is supplied to the starter and the gas supply valve even though no start command is issued to the starter and the gas supply valve. As a result, the gas engine is driven. Therefore, when such a situation occurs, it is determined that the switch means is abnormal, and the power supply to the electrical component is quickly stopped.

  In the air conditioner, the electrical component is, for example, an electric motor for driving a compressor, and the abnormality detection means is, for example, an operation command to the electric motor when the compressor is rotating. When no is issued, an abnormality of the switch means is detected.

  In the case of an air conditioner that uses an electric motor as a power source for the compressor, a switch means for controlling power supply to the electric motor is interposed in a path connecting the electric motor and the power supply device. And, when an abnormality such as welding or contact failure occurs in this switch means, the state in which electric power is supplied to the motor is maintained even though no operation command is issued to the motor, The compressor is driven. Therefore, when such a situation occurs, it is determined that the switch means is abnormal, and the power supply to the electrical component is quickly stopped.

In the air conditioner, the abnormality detection means may detect an abnormality of the switch means when the ambient temperature is equal to or higher than a specified value or the rate of increase of the ambient temperature is equal to or higher than a specified value.
When an abnormality such as welding or contact failure occurs in the switch means, heat may be generated due to excessive power supply, and the ambient temperature may increase. Therefore, the abnormality detecting means may detect the abnormality of the switch means by detecting this temperature rise.

  The present invention is provided in a path connecting a plurality of electrical components, a power supply device for supplying power to the electrical components, and the power supply device and the electrical components, and turning on / off power to the electrical components A protection device for use in an air conditioner comprising a switching means for performing an operation, and when an abnormal signal is input, a blocking means for cutting off power supply from the power supply device, and detecting an abnormality in the switching means Provided is a protection device comprising an abnormality detection means and an abnormality signal output means for outputting the abnormality signal to the blocking means when an abnormality of the switch means is detected.

  According to such a configuration, when an abnormality of the switch means is detected, an abnormality signal is output to the interruption means, so that the power supply from the power supply device is interrupted by the interruption means that has received this abnormality signal. It will be. As a result, when an abnormality occurs in the switch means, it is possible to quickly stop the power supply to the electrical component, so that damage or failure of the electrical component can be prevented.

  According to the present invention, it is possible to prevent the electrical component from being damaged or failed due to the occurrence of an abnormality in the switch means, and thus it is possible to improve the durability of the electrical component.

Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an air conditioner according to the present embodiment. The air conditioner according to the present embodiment is a gas heat pump type air conditioner that uses a gas engine as a power source of a compressor, and is mainly composed of an indoor unit 10 and an outdoor unit 20. The indoor unit 10 has an indoor heat exchanger for evaporating and evaporating a low-temperature and low-pressure liquid refrigerant during cooling operation to remove heat from the room air, and for heating operation, condensing and liquefying high-temperature and high-pressure gas refrigerant to heat indoor air. 11, a fan 12 that circulates indoor air, and an indoor unit expansion valve 13 that decompresses and expands the liquid refrigerant during cooling.

  The outdoor unit 20 is mainly composed of two components: a refrigerant circuit unit 30 that further constitutes a refrigerant circuit therein, and a gas engine unit 40 that includes the gas engine 1 and a device that accompanies the gas engine 1. Yes.

  In the refrigerant circuit section 30, an outdoor heat exchanger 31, a water heat exchanger 32, a compressor 33, an accumulator 34, a four-way valve 35, an oil separator 36, an expansion valve 37, a water heat exchanger expansion valve 38, and a fan 39 are provided. It is equipped. The outdoor heat exchanger 31 condenses and liquefies high-temperature and high-pressure gas refrigerant during cooling operation and dissipates heat to the outdoor air, and conversely evaporates and vaporizes low-temperature and low-pressure liquid refrigerant during heating operation to take heat from the outdoor air. That is, the outdoor heat exchanger 31 performs the reverse operation of the previous indoor heat exchanger 11 during each cooling and heating operation.

  The water heat exchanger 32 is provided so that the refrigerant recovers heat from the cooling water of the gas engine 1 described later. That is, during the heating operation, the refrigerant is given heat from the cooling water of the gas engine 1, so that the effect of the heating operation can be enhanced.

  The compressor 33 compresses the gas refrigerant sucked from either the indoor heat exchanger 11 or the outdoor heat exchanger 31 and discharges it as a high-temperature and high-pressure gas refrigerant. The accumulator 34 is provided to store the liquid component contained in the gas refrigerant flowing into the compressor 33. The four-way valve 35 is provided to selectively send the high-temperature and high-pressure gas refrigerant compressed in the compressor 33 to either the indoor heat exchanger 11 or the outdoor heat exchanger 31. The oil separator 36 separates oil contained in the refrigerant.

  The expansion valve 37 is for depressurizing and expanding the high-temperature and high-pressure liquid refrigerant sent from the outdoor heat exchanger 31 during the cooling operation to obtain a low-temperature and low-pressure liquid refrigerant. The fan 39 is provided to introduce outdoor air into the outdoor unit 20 and distribute it to the outdoor heat exchanger 31 and a radiator 53 described later.

  On the other hand, the gas engine unit 40 includes four systems, a cooling water system 50, an exhaust gas system 60, a fuel and air intake system 70, and an engine oil system 80, centering on the gas engine 1. The gas engine 1 is directly connected to a compressor 33 installed in the refrigerant system 30 by a shaft, so that power is transmitted from the gas engine 1 to the compressor 33.

  The cooling water system 50 includes a water pump 51, a reservoir tank 52, and a radiator 53, and the cooling water goes around a circuit constituted by these and the water heat exchanger 32 to cool the gas engine 1. The water pump 51 is provided for circulating the cooling water of the gas engine 1 to the circuit. The reservoir tank 52 is for temporarily storing the surplus in the cooling water flowing through this circuit, or for supplying it when the cooling water is insufficient in the circuit. The radiator 53 is configured integrally with the outdoor heat exchanger 31 and is provided to release heat taken by the cooling water from the gas engine 1 to the outside air.

  The cooling water system 50 is provided with an exhaust gas heat exchanger 54 in addition to the above-described configuration. This is provided to recover the heat of the exhaust gas into the cooling water. Further, the cooling water system 50 is provided with the water heat exchanger 32 described above, and is arranged so as to straddle both the refrigerant system 30 and the cooling water system 50. Therefore, during heating operation, the cooling water not only takes heat from the gas engine 1 but also recovers heat from the exhaust gas, and the recovered heat is transferred from the cooling water to the refrigerant through the water heat exchanger 32. It is a mechanism to be given.

Further, the cooling water system 50 is provided with a bypass pipe 55 that bypasses the cooling water flowing into the water heat exchanger 32. In addition, a first water valve 56 that is a distribution flow rate adjustment valve is provided at a branch between the path through which the cooling water flows to the water heat exchanger 32 and the bypass pipe 55. Further, a second water valve 57 is provided at a branch between a path through which the cooling water flows through the water heat exchanger 32 and a path through which the cooling water flows through the radiator 53. The first water valve 56 switches the flow path of the cooling water between the second water valve 57 side and the bypass pipe 55 side, and the second water valve 57 supplies the cooling water to the hydrothermal exchanger 32 side and the radiator 53 side. Distribute.
The first and second water valves 56 and 57 are controlled by, for example, a control device (see FIG. 2) described later, and change the flow path of the cooling water flowing through the water heat exchanger 32, the radiator 53, and the bypass pipe 55. To do.

  The exhaust gas system 60 includes a muffler 61, an exhaust top 62, and a drain filter 63, and is a system for guiding the exhaust gas discharged from the gas engine 1 to the outside. The muffler 61 is provided to absorb noise that accompanies when the gas engine 1 discharges exhaust gas. The exhaust top 62 is provided so as to separate moisture contained in the exhaust gas and prevent it from being scattered into the external environment. The drain filter 63 is provided for temporarily storing the water separated from the exhaust top 62 described above.

  The fuel and air intake system 70 includes a gas regulator 71, a solenoid valve 72, an intake box 73, and an air cleaner 74, and is a system for supplying fuel and air to the gas engine 1. The gas regulator 71 is provided to adjust the delivery pressure of the gas supplied from the outside of the outdoor unit 20 via the gas shut-off valve 8 described later. On the other hand, the intake box 73 is provided for taking in air from the outside of the outdoor unit 20. The intake box 73 also has a function of suppressing the generation of noise during intake. The air cleaner 74 is provided to remove dust from the air thus sucked.

  The engine oil system 80 includes an oil sub tank 81 and is provided to supply lubricating oil to the gas engine 1. An oil pan 41a for receiving oil in the oil sub-tank 81 and storing oil supplied to the engine sliding portion is provided at the lower part of the gas engine 1.

  Next, in the gas heat pump type air conditioner having the above-described configuration, the operation during each of the indoor cooling and heating will be described. First, during the cooling operation, the four-way valve 35 of the refrigerant circuit unit 30 is in a state where the compressor 33 and the outdoor heat exchanger 31, and the indoor heat exchanger 11 and the accumulator 34 are connected to each other. In this state, the high-temperature and high-pressure gas refrigerant discharged from the compressor 33 is sent to the outdoor heat exchanger 31.

  The high-temperature and high-pressure gas refrigerant is condensed and liquefied by the outdoor heat exchanger 31 and dissipates heat to the outdoor air to become a high-temperature and high-pressure liquid refrigerant. Further, the high-temperature and high-pressure liquid refrigerant is reduced in pressure in the process of passing through the expansion valve 37 to become a low-temperature and low-pressure liquid refrigerant, and then evaporated and evaporated in the indoor heat exchanger 11. The refrigerant removes heat from the indoor air and cools it to become a low-temperature and low-pressure gas refrigerant. The refrigerant flows into the accumulator 34 through the four-way valve 35, and the liquid component is separated and sucked into the compressor 33. The gas refrigerant sucked into the compressor 33 is compressed by the operation of the compressor 33, becomes a high-temperature and high-pressure gas refrigerant, and is sent to the outdoor heat exchanger 31 again.

  On the other hand, during the heating operation, the four-way valve 35 is in a state where the compressor 33 and the indoor heat exchanger 11, and the water heat exchanger 32 and the accumulator 34 are connected to each other. In this state, the high-temperature and high-pressure gas refrigerant discharged from the compressor 33 is sent to the indoor heat exchanger 11 of the indoor unit 10. The high-temperature and high-pressure gas refrigerant is condensed and liquefied in the indoor heat exchanger 11 and radiates and warms the indoor air, and then becomes a high-temperature and high-pressure liquid refrigerant. Flows into either. In the water heat exchanger 32, the high-temperature and high-pressure liquid refrigerant takes heat from the engine coolant and evaporates to become a low-temperature and low-pressure gas refrigerant. In the outdoor heat exchanger 31, heat is taken from the outdoor air to evaporate and become a low-temperature and low-pressure gas refrigerant. These gas refrigerants flow into the accumulator 34 and are separated into liquid components and then sucked into the compressor 33. The gas refrigerant sucked into the compressor 33 is compressed, becomes a high-temperature and high-pressure gas refrigerant, and is sent to the indoor heat exchanger 11 again.

  The gas engine 1 is in a driving state to transmit power to the compressor 33 regardless of the cooling operation or the heating operation. In the cooling water system 50, exhaust heat recovery in the exhaust gas heat exchanger 54 and engine cooling in the gas engine are performed. Is always done. Then, after collecting the exhaust heat, the cooling water heated through the gas engine is circulated to the radiator 53 and the water heat exchanger 32 through the pipe 50 a constituting the cooling water system 50.

  The operation of the gas engine 1 of such a gas heat pump type air conditioner is controlled by a control device 2 shown in FIG. That is, the gas engine 1 is operated in an optimum state corresponding to the load by controlling the ignition timing, throttle opening, fuel valve opening, and the like by the control device 2. Data necessary for driving the gas engine 1 is input to the control device 2 from the gas engine 1 and various sensors attached to the periphery of the gas engine 1. For example, a detection signal from a rotation speed sensor 3 that detects the rotation speed of the gas engine 1 and a detection signal from a temperature sensor 4 that detects an outside air temperature (gas engine ambient temperature) are input.

The gas engine 1 is provided with a starter 5 for giving a starting force. The starter 5 is driven by electric power supplied from the power supply device 6. Here, the power supply device 6 includes, for example, a transformer that steps down a voltage from a commercial power supply to a voltage suitable for various electrical components. In the path connecting the starter 5 and the power supply device 6, a relay (switch means) 7 a for turning on / off power to the starter 5 is provided.
Further, the gas piping for supplying gas to the gas engine 1 is provided with a gas cutoff valve 8 for cutting off the gas supply. The gas shut-off valve 8 is, for example, an electromagnetic valve, and is controlled by electric power supplied from the power supply device 6 like the starter 5. A relay (switch means) 7b for turning on / off power to the gas cutoff valve 8 is provided in a path connecting the gas cutoff valve 8 and the power supply device 6.

The above-described power supply device 6 is provided with a leakage breaker (shut-off means) 9 for cutting off power supply from the power supply device 6 when an overcurrent is input. In the present embodiment, the power supply device 6 and the earth leakage breaker 9 are incorporated in the air conditioner.
The operation control of the starter 5 described above, the opening control of the gas cutoff valve 8, and the opening / closing control of the relays 7a and 7b are performed by the control device 2.

  Further, the control device 2 includes a protection device 100 for detecting an abnormality in the relays 7a and 7b and protecting the starter 5, the gas cutoff valve 8, and the electric parts such as the gas engine. Specifically, the protection device 100 detects a leakage current with respect to the leakage breaker 9 when an abnormality is detected by the abnormality detection unit (abnormality detection unit) 101 that detects abnormality of the relays 7a and 7b. A leakage current output unit (abnormal signal output means) 102 is provided.

In such a configuration, the protection device 100 built in the control device 2 operates as follows.
First, the abnormality detection unit 101 of the protection device 100 constantly monitors whether or not an abnormality has occurred in the relays 7a and 7b. Specifically, the abnormality detection unit 101 detects an abnormality according to the processing procedure shown in FIG. First, in step SA1 of FIG. 3, the abnormality detection unit 101 determines whether a detection signal from the rotation speed sensor 3 is input. As a result, when the gas engine 1 is driven and a detection signal related to the rotational speed from the rotational speed sensor 3 is input, the process proceeds to step SA2 where a drive command is output to the starter 5. It is determined whether or not. As a result, when the starter drive command is not output, the process proceeds to step SA3, and it is determined whether or not the open command is output to the gas shut-off valve 8. As a result, when an open command is not output to the gas shut-off valve 8, it is determined that an abnormality has occurred in at least one of the relays 7a and 7b, and the flow proceeds to step SA5 and the leakage current output unit 102 Notify the occurrence of abnormality.

  That is, in the above-described case, the starter 5 and the gas cutoff valve 8 are not controlled by the control device 2 with respect to the starter 5 and the gas cutoff valve 8, despite the control of the control device 2. It can be determined that the gas engine is operating. In such a situation, there is a possibility that the power supply from the power supply device 6 to the starter 5 or the gas cutoff valve 8 is maintained due to an abnormality such as welding of the relays 7a and 7b. , 7b, it is determined that an abnormality has occurred, and the leakage current output unit 102 is notified to that effect.

  On the other hand, if the detection signal from the rotation speed sensor 3 is not input in step SA1, the operation command is output to the starter 5 in step SA2, or the open command is output to the gas cutoff valve 8 in step SA3. If yes, the process proceeds to step SA4, where the rate of increase (increase) in the detected value by the temperature sensor 4 is equal to or greater than a specified value, or the detected value is a specified value (a value different from the specified value related to the rate of increase). It is determined whether it is above. As a result, if the increase in the detected value is equal to or greater than the specified value, it is determined that an abnormality has occurred in at least one of the relays 7a and 7b, and the process proceeds to step SA5 where an abnormality has occurred in the leakage current output unit 102. To be notified.

  That is, in this case, the starter 5 and the gas shut-off valve 8 which are peripheral devices of the gas engine 1 are normally driven, but the starter 5 and the like generate heat and the ambient temperature rises due to some factor. Judgment can be made. Even in such a situation, since there is a possibility that the power supply from the power supply device 6 is maintained due to an abnormality such as welding of the relays 7a and 7b, the abnormality detection unit is provided in at least one of the relays 7a and 7b. It is determined that an abnormality has occurred, the process proceeds to step SA5, and the leakage current output unit 102 is notified of the occurrence of the abnormality.

  In this way, the leakage current output unit 102 that has received the abnormality notification from the abnormality detection unit 101 outputs the current exceeding the specified value to the leakage breaker 9, thereby forcibly operating the leakage breaker 9. As a result, the earth leakage breaker 9 that has detected a current exceeding the specified value operates to quickly cut off the power supply from the power supply device 6 and the power supply to the starter 5 and the gas cutoff valve 8 is stopped. .

  As described above, according to the air conditioner according to the present embodiment, an abnormality occurs in the switch means such as the relays 7a and 7b that turn on / off the electric power to the electrical parts such as the starter 5 and the gas cutoff valve 8. In such a case, the abnormality is detected by the abnormality detection unit 101, and the leakage current is flowed from the leakage current output unit 102 to the leakage breaker 9, whereby the leakage breaker 9 is forcibly activated and the power supply device 6 Since the power supply is cut off, it is possible to prevent the starter 5, the gas cutoff valve 8, the gas engine 1 and its peripheral parts from being damaged or broken.

  In the above-described embodiment, the starter 5, the gas shut-off valve 8, and the gas engine 1 are given as examples of the electrical parts included in the air conditioner, and the relays 7 a and 7 b are given as examples of the switch means for detecting an abnormality. However, the switch means such as a relay to be detected by the abnormality detection unit 101 is not limited to these. That is, if it is a relay etc. which intervenes in the path which connects the electric component with which an air conditioner is equipped, and a power supply device, it will be a candidate for abnormality detection. The abnormality detection of the switch unit in this case is not limited to the above-described determination method, and an abnormality detection method according to the characteristics of each switch unit can be employed.

In the above-described embodiment, the gas heat pump type air conditioner that uses the gas engine 1 as the power source of the compressor 33 has been described. However, the protection device 100 described above uses an electric motor as the power source of the compressor 33. The present invention can also be applied to an air conditioner.
In this case, for example, the abnormality detection unit 101 is a switch such as a relay interposed in a path connecting the electric motor and the power supply device when the electric motor is driven and a start command is not issued to the electric motor. It may be determined that an abnormality has occurred in the means. Similarly to the gas heat pump type air conditioner described above, when a detection value is received from the temperature sensor 4 installed around the motor, and the increase in the detection value is equal to or higher than a specified value, a switch such as a relay It is also possible to detect abnormality of the means.
As described above, the power supply device is not limited to the gas heat pump air conditioner, and the air conditioner in which the compressor is driven by the electric motor can quickly detect the abnormality of the switch means such as the relay and forcibly operate the leakage breaker 9. Since the power supply from 6 is stopped, it is possible to prevent damage to electric parts such as an electric motor.

In the above-described embodiment, the protection device 100 is premised on processing by hardware, but it is not necessary to be limited to such a configuration. For example, a configuration in which software is separately processed based on output signals from each sensor is also possible. In this case, the protection device 100 is a computer-readable program in which a program for realizing all or part of the processing realized by the main storage device such as CPU and RAM, the abnormality detection unit 101 and the leakage current output unit 102 is recorded. A possible recording medium is provided. Then, the CPU reads out the program recorded in the storage medium and executes information processing / calculation processing, thereby realizing processing similar to that of the above-described failure diagnosis apparatus.
Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.

It is a figure which shows the whole schematic structure of the gas heat pump type air conditioner which concerns on one Embodiment of this invention. It is a figure which shows the principal part structure of the gas heat pump type air conditioner which concerns on one Embodiment of this invention. It is a flowchart which shows the control content of the protection apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas engine 2 Control apparatus 3 Rotation speed sensor 4 Temperature sensor 5 Starter 6 Power supply device 7a, 7b Relay 8 Gas shut-off valve 9 Earth leakage breaker 33 Compressor 100 Protection device 101 Abnormality detection part 102 Leakage current output part

Claims (6)

A power supply for supplying power to at least one electrical component;
Switch means provided in a path connecting the power supply device and the electrical component, and for turning on / off power to the electrical component;
A shut-off means for shutting off power supply from the power supply device when an abnormal signal is input;
An abnormality detection means for detecting an abnormality of the switch means;
An air conditioner comprising: an abnormality signal output unit that outputs the abnormality signal to the blocking unit when an abnormality of the switch unit is detected.   2. The air conditioner according to claim 1, wherein the shut-off unit is a breaker that cuts off power supply from the power supply device when a current of a specified value or more is input as the abnormal signal. The electrical component is at least one of a starter for starting a gas engine and a gas shut-off valve for shutting off a gas supplied to the gas engine;
The abnormality detection unit detects an abnormality of the switch unit when the engine is rotating and an operation command is not issued to the starter and the gas supply valve. 2. The air conditioner according to 2. The electrical component is an electric motor for driving a compressor,
3. The abnormality detection unit according to claim 1, wherein the abnormality detection unit detects an abnormality of the switch unit when the compressor is rotating and an operation command is not issued to the electric motor. 4. Air conditioner.   5. The abnormality detection unit according to claim 1, wherein the abnormality detection unit detects an abnormality of the switch unit when the ambient temperature is equal to or higher than a specified value or the rate of increase in the ambient temperature is equal to or higher than a specified value. The air conditioner described. A plurality of electrical components, a power supply device that supplies power to the electrical components, and a switch unit that is provided in a path connecting the power supply device and the electrical components, and that switches on / off power to the electrical components A protection device used for an air conditioner comprising:
A shut-off means for shutting off power supply from the power supply device when an abnormal signal is input;
An abnormality detection means for detecting an abnormality of the switch means;
A protection device comprising: an abnormality signal output means for outputting the abnormality signal to the blocking means when an abnormality of the switch means is detected.

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