JP3178348B2 - Control device for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner, and more particularly to a measure for determining the operation of a protection switch.

[0002]

2. Description of the Related Art Conventionally, an ice storage type air conditioner has been
The purpose is to reduce the power demand at the peak of the cooling load and to expand the power demand at the off-peak time,
Slurry ice, which becomes cold during cooling, is generated and stored during off-peak cooling loads.

An air conditioner of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-251177, a compressor, an outdoor heat exchanger, an expansion valve, a supercooling heat exchanger, and an indoor heat exchanger. And a heat storage circuit provided with a heat storage tank and a pump and connected to the supercooling heat exchanger.

[0004] In the air conditioner, during the ice making operation, the heat storage water is guided from the heat storage tank to the supercooling heat exchanger, cooled to a supercooled state, and the supercooled state is eliminated to produce slurry ice. The ice is stored in a heat storage tank.

In order to cool the room using the ice, the cooling water cooled by the ice is supplied to the supercooling heat exchanger, while the refrigerant discharged from the compressor is guided to the supercooling heat exchanger. And heat exchange with cold water to condense. After reducing the pressure of the condensed refrigerant, the refrigerant is evaporated by an indoor heat exchanger to cool the room.

On the other hand, various air conditioners including the above-mentioned ice storage type air conditioner are disclosed in Japanese Patent Application Laid-Open No. 2-27226.
As disclosed in Japanese Patent Publication No. 0, a protection circuit having a plurality of protection switches such as an overcurrent relay of a compressor motor is provided. When an abnormality such as an overcurrent flows, the air-conditioning operation is stopped.

[0007]

In the above-mentioned protection circuit for an air conditioner, a plurality of protection switches are connected in series, and the operation is stopped uniformly without discriminating the contents of the abnormality with respect to various abnormalities. Was like that.

However, in the air conditioner of the ice storage type, if the stop control is uniformly performed for various abnormalities,
Conversely, inconvenience may occur.

For example, when the temperature of the high-pressure refrigerant rises abnormally during the cooling operation and the protection switch is activated, the pump of the heat storage circulation circuit is conventionally stopped, but in this case, the temperature of the high-pressure refrigerant is reduced. There was a problem that it could not be reduced.

That is, when there is no abnormality in the pump, it is better to drive the pump to circulate the heat storage water so that the refrigerant can be cooled in the supercooling heat exchanger and the temperature of the high-pressure refrigerant is reduced. Can be done.

On the other hand, in order to be able to determine the contents of the abnormality, it is necessary to provide a detection circuit for each input of the protection switch, and there is a problem that the circuit configuration becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to determine the operation of a protection switch and to drive a normal actuator so that an abnormality can be quickly eliminated. It is the purpose.

[0013]

[Means for Solving the Problems]

-Summary of the invention-In the present invention, the pump (32) of the heat storage circuit (30) and the actuator (21, ...) such as the compressor (21) of another refrigerant circuit (20) operate in different periods. Because the compressor (2
When the protection circuit (50) outputs an operation signal during the operation of 1), while the abnormality of the actuator (21, ...) is determined,
When the protection circuit (50) outputs an operation signal when the compressor (21) is stopped, an abnormality of the pump (32) is determined and an abnormality determination signal is output. Based on the abnormality determination signal, the pump (32)
Is normal, abnormal processing such as continuous driving of the pump (32) is executed.

-Specific Items of the Invention- Specifically, as shown in FIG. 1, means taken by the invention according to claim 1 includes a plurality of actuators (21, 32,...) Including a compressor (21). ), And the operation control means (41) drives and controls the actuators (21, 32,...) To perform an air-conditioning operation, while the one first actuator (32)
It is assumed that the air conditioner is driven at least at a different time from the second actuator (21,...) To perform the air conditioning operation.

Further, a plurality of protection switches (51, 52,...) Which are activated when an abnormality occurs are provided. Further, the protection circuit (50) connected to the plurality of protection switches (51, 52,...) And outputting one operation signal to the operation control means (41) when the protection switches (51, 52,. Is provided.
In addition, when the protection circuit (50) outputs an activation signal when the at least one second actuator (21) is activated, the second signal is output.
While the abnormality of the actuators (21,...) Is determined and the protection circuit (50) outputs an operation signal when the one second actuator (21) is stopped, the abnormality of the first actuator (32) is determined. An abnormality determining means (42) for outputting a determination signal to the operation control means (41) is provided.

Further, the means adopted by the invention of claim 2 is the same as that of the invention of claim 1 except that at least the compressor (21), the heat source side heat exchanger (23), and the expansion mechanism (EV-3) are provided. A refrigerant circulation circuit (20) in which a supercooling heat exchanger (12) is connected in order and a refrigerant circulates, and at least a heat storage tank (31) and a pump (32) are connected in order and a heat storage medium circulates, A heat storage circuit (30) connected to the subcooling heat exchanger (12) and exchanging heat between the refrigerant and the heat storage medium in the subcooling heat exchanger (12) is provided. The first actuator (32) includes a pump (32) of a heat storage circuit (30), and the second actuator (21,...) Includes a compressor (21) of a refrigerant circuit (20). . In addition, the abnormality determining means (42) is provided with a protection circuit (5) when the compressor (21) operates.
0) outputs an activation signal, the second actuator (2
While the protection circuit (50) outputs an activation signal when the compressor (21) is stopped, the pump (3,...)
It is configured to determine the abnormality in 2) and output an abnormality determination signal.

The means adopted by the third aspect of the present invention is the same as the first aspect of the invention, except that the protection circuit (50)
Include a plurality of protection switches (51, 52,...) Connected in series and an operation detection circuit (54). When any of the protection switches (51, 52,. )
Outputs an operation signal.

-Driving operation-According to the above-mentioned invention specifying matter, in the invention according to claim 1,
The first actuator (32) and the second actuator (21,
..) Are controlled by the operation control means (41) to control the air-conditioning operation. Specifically, according to the second aspect of the present invention, the air-conditioning operation is performed by controlling the pump (32) of the heat storage circuit (30) and the compressor (21) of the refrigerant circuit (20).

The pump (32) and the compressor (2)
The status of each actuator such as 1) is indicated by the protection switch (5
1, 52, ...). That is, for example, when an overcurrent flows to the compressor (21) and the protection switch (51) of the compressor (21) is opened, the protection circuit (50) is shut off and the compressor (21) stops.

Therefore, during the air-conditioning operation, it is determined whether or not the protection switch (51, 52,...) Has been activated, and when any one of the protection switches (51, 52,.
0) outputs an operation signal, and specifically, in the invention according to claim 3, the operation detection circuit (54) outputs an operation signal.

In response to the operation signal, abnormality determining means (42)
Means that if the compressor (21), which is one of the second actuators, is operating, it is determined that an abnormality other than that of the pump (32) has occurred and abnormal processing such as operation stop is performed, while the compressor (21) is stopped. When the protection switch (52) is operated, it is determined that the pump (32) as the first actuator is abnormal, and abnormal processing such as operation stop is performed.

That is, for example, when detecting the water temperature, there is a state where only the pump (32) of the heat storage circuit (30) is driven and the compressor (21) and the like are stopped. In this state, when the protection switch (52) is activated,
Since the pump (32) itself is abnormal, the operation of the pump (32) is stopped.

On the other hand, when the protection switch (52) does not operate when only the pump (32) is operated, the compressor (2)
If the protection switches (51,...) Are activated during the operation of 1), an abnormality has occurred in the compressor (21) other than the pump (32).

At this time, since there is no abnormality in the pump (32) itself, the compressor (21) is stopped to stop the operation, but the pump (32) is driven to circulate the heat storage medium. As a result, for example, when the high pressure is excessively increased during the cooling operation using the cold storage, the pump (3) is provided in addition to the compressor (21).
If the operation is stopped until 2), the high-pressure refrigerant is not cooled and the high pressure does not decrease. Therefore, the pump (32) is driven to circulate the heat storage water.

[0025]

Thus, according to the first aspect of the present invention, it is possible to distinguish between an abnormality of the first actuator (32) and an abnormality of the second actuators (21,...) Other than the first actuator (32). As a result, it is possible to take measures corresponding to the details of the abnormality as compared with the case where the operation is stopped uniformly in the event of an abnormality as in the related art, and it is possible to perform a reliable abnormality processing.

In particular, according to the second aspect of the present invention, there is a state in which the heat storage circulation circuit (30) is provided and only the pump (32) as the first actuator is driven.
Since it is possible to accurately determine the abnormality of the actuator other than 2) and the pump (32), when the pump (32) is normal, the pump (32) can be continuously operated.

As a result, for example, when the temperature of the high-pressure refrigerant rises abnormally during the cooling operation, the operation of the pump (32) can be continued to surely lower the temperature of the high-pressure refrigerant.

According to the third aspect of the present invention, the plurality of protection switches (51, 52,...) Are merely connected in series as in the conventional case, and the detection circuit is connected to the protection switch (5).
1, 52,...) Does not need to be provided for each input, so that the abnormality content can be accurately determined with a simple circuit configuration without increasing the number of control elements.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 2, the regenerative air conditioner (10) includes a refrigerant circuit (20) for circulating a refrigerant and a heat storage circuit (30) for circulating heat stored water. Although not shown, the circulation circuit (20) and the heat storage circulation circuit (30) are housed in an outdoor unit and an indoor unit. Therefore, the refrigerant circulation circuit (20) and the heat storage circulation circuit (30) will be described in order.

-Refrigerant circuit (20)-The refrigerant circuit (20) comprises a compressor (21), a four-way switching valve (22), an outdoor heat exchanger (23) as a heat source side heat exchanger, and an outdoor. A reversible operable main refrigerant in which an electric expansion valve (EV-1) and an indoor electric expansion valve (EV-2), an indoor heat exchanger (24), and an accumulator (25) are sequentially connected by a refrigerant pipe (26). A circuit (27) is provided. The indoor heat exchanger (24) and the indoor electric expansion valve (EV-2) are provided in the indoor unit, while another compressor (21) and the like are provided in the outdoor unit.

Further, the refrigerant circulation circuit (20) has a heat storage refrigerant circuit (2a), an ice core circuit (2b) and a hot gas passage (2).
c) is provided. The heat storage refrigerant circuit (2a) is a circuit in which the refrigerant circulates during a cold storage operation or a cooling operation using cold storage, and has one end having an outdoor heat exchanger (23) and an outdoor electric expansion valve (EV-1). ), The other end is connected between the four-way switching valve (22) and the accumulator (25).
Solenoid valve (SV-1), preheater (11), heat storage electric expansion valve (EV-3) as expansion mechanism, supercooling heat exchanger (12), and second solenoid valve (SV-2) are connected in order. It is configured.

The ice nucleus circuit (2b) is a circuit for generating ice nuclei in a heat storage circulating circuit (30), which will be described later, and has one end provided with a heat storage electric expansion valve (EV-3) in the heat storage refrigerant circuit (2a). ) And the subcooling heat exchanger (12), the other end is connected between the subcooling heat exchanger (12) and the second solenoid valve (SV-2), and the capillary tube (CP) And an ice nucleus generator (13) are connected in order.

The hot gas passage (2c) is a circuit for supplying the refrigerant discharged from the compressor (21) to the subcooling heat exchanger (12) during a cooling operation utilizing cold storage and the like. (2
On the discharge side of 1), the other end is connected to the subcooling heat exchanger (12), and a third solenoid valve (SV-3) is provided.

-Heat storage circulation circuit (30)-As shown in FIG. 3, the heat storage circulation circuit (30) includes a heat storage tank (31), a pump (32), a preheater (11), and a mixer (33). The supercooling heat exchanger (12) and the supercooling elimination unit (34) are sequentially connected by a water pipe (35) so that circulation of heat storage water as a heat storage medium (see an arrow in FIG. 3) is possible.

The supercooling heat exchanger (12) is a vertical shell-and-tube heat exchanger, and although not shown, is constituted by housing a plurality of heat transfer tubes in a container. The subcooling heat exchanger (12) is a refrigerant circuit (20)
The heat exchange is performed between the refrigerant flowing in the container and the heat storage water flowing in the heat transfer tube, and the heat storage water is cooled to a supercooled state during the cold heat storage operation.

The preheater (11) is a double-pipe heat exchanger, in which a refrigerant flows outside the inner pipe and heat storage water flows inside the inner pipe, and heats the heat storage water to form a water pipe ( The ice flowing through 35) is thawed.

The ice nucleus generator (13) is attached to a water pipe (35) at a position downstream of the subcooling heat exchanger (12), and a part of the heat storage water flowing through the water pipe (35). Is cooled and iced by the refrigerant in the refrigerant circulation circuit (20), and is supplied as ice nuclei to the subcooling elimination section (34).

The mixer (33) and the subcooling eliminating section (34)
Are each formed of a hollow cylindrical container, and are configured such that the heat storage water introduced in the tangential direction forms a swirling flow.
The mixer (33) stirs the heat storage water heated by the preheater (11) and ice to promote melting of the ice,
The supercooling eliminator (34) agitates the ice nuclei generated by the ice nucleus generator (13) and the supercooled water generated by the supercooled heat exchanger (12) to eliminate supercooling. ing.

-Configuration of Sensors- The refrigerant circulation circuit (20) and the heat storage circulation circuit (30) include:
Various sensors are provided. First, an outdoor air temperature sensor (Th-1) for detecting an outdoor air temperature is provided near an outdoor heat exchanger (23), and an outdoor liquid temperature sensor (Th-2) for detecting a liquid refrigerant temperature of the outdoor heat exchanger (23). ) Is on the liquid side of the outdoor heat exchanger (23), and a discharge gas temperature sensor (Th-3) for detecting the discharge gas refrigerant temperature of the compressor (21) is on the discharge side of the compressor (21). A suction gas temperature sensor (Th-4) for detecting the suction gas refrigerant temperature of 21) is provided on the suction side of the compressor (21).

Further, a high-pressure sensor (H-PS) for detecting the pressure of the refrigerant discharged from the compressor (21) is provided on the discharge side of the compressor (21) at a low pressure for detecting the pressure of the suction refrigerant of the compressor (21). A pressure sensor (L-PS) is provided on each suction side of the compressor (21), and a high-pressure protection switch (P-PS) that operates when the discharge refrigerant pressure of the compressor (21) reaches a predetermined high pressure is provided by the compressor. (2
It is provided on the discharge side of 1).

On the other hand, an inlet water temperature sensor (TW-1) is provided at the water inlet of the preheater (11), and an outlet water temperature sensor (TW-2) is provided at the water outlet of the mixer (33). A supercooling water temperature sensor (TW-3) is provided at the water outlet side of the exchanger.
4) is provided with an ice formation detection sensor (TW-4). Further, a flow switch (SW-F) that detects the flow rate of the heat storage water and turns on when the flow rate becomes equal to or lower than a predetermined value is provided at the lower end of the preheater (11).

-Control Configuration- Detection signals from the above sensors (Th-1 to L-PS, TW-1 to TW-4) are input to a controller (40). As shown in FIG. 6, the controller (40) outputs a control signal such as an operation command to the compressor (21) and the pump (32) based on the detection signal, and also controls each electric expansion valve (EV-1). , EV-3,...) Are provided with operation control means (41) for controlling operation by outputting a control signal such as an opening degree. And the above pump (3
2) constitutes the first actuator while the compressor (2
Other electric expansion valves (EV-1, EV-3,...) Including 1) constitute the second actuator.

Further, the controller (40) has the configuration shown in FIG.
As shown in (1), as a feature of the present invention, a protection circuit (50) to which a plurality of protection switches (51, 52,...) For detecting an overcurrent abnormality or the like are provided. The protection switch (5
1, 52,...) Are normally-closed contacts and have a first protection switch (51) that opens when the compressor (21) is abnormal and a second protection switch (open) that opens when the pump (32) is abnormal. 52)
And a third protection switch (53) that opens when an abnormality occurs in another second actuator such as an electric expansion valve (EV-1, EV-3,...).
It is composed of

The protection circuit (50) is connected between two power supply lines (5a, 5b), and each protection switch (51, 52,
…) Are connected in series and a relay switch (Ry)
And an exciting coil (MC) of an electromagnetic contactor of the compressor (21) are connected in series. Further, in the protection circuit (50),
An operation detection circuit (54) is connected in parallel with the relay switch (Ry) and the exciting coil (MC). When any one of the protection switches (51, 52,...) Is opened, the protection circuit (50) demagnetizes the exciting coil (MC) of the electromagnetic contactor of the compressor (21) and deactivates the compressor (21). ) Is stopped, while the operation detection circuit (54) outputs one operation signal to the operation control means (4).
1) is configured to output.

The controller (40) is provided with abnormality determining means (42), and the abnormality determining means (42) operates when the compressor (21) operates, and the operation detecting circuit (54) of the protection circuit (50).
Outputs an activation signal, determines that the second actuator is abnormal, and when the compressor (21) stops, the protection circuit (50)
When the operation detection circuit (54) outputs an operation signal, it determines an abnormality of the pump (32) and outputs an abnormality determination signal to the operation control means (41).

That is, the heat storage type air conditioner (10)
As shown in FIG. 8, there are three driving modes of the actuator.

When detecting the water temperature of the heat storage circuit (30), the second actuator such as the compressor (21) is stopped and the pump (3) as the first actuator is stopped.
In some cases, only 2) is driven (see FIG. 6A).

During the heat storage operation or the cooling operation using the stored cold heat, the pump (32) may be simultaneously driven in addition to the compressor (21) (see FIG. 6B).

During normal cooling operation, the pump (3
While 2) is stopped, only the second actuator such as the compressor (21) may be driven (see FIG. 6C).

Therefore, the second protection switch (52) does not operate when only the pump (32) is driven.
When the first protection switch (51) is activated during 1),
Since it is considered that the second actuator such as the compressor (21) is abnormal, the contents of the abnormality are determined.

-Operation and Control Operation- Next, the operation and control operation of the above-described regenerative air conditioner (10) will be described. Therefore, first, the main driving operation will be described.

-Normal Cooling Operation- In this operation mode, the four-way switching valve (22) is switched to the solid line side in FIG. 2, the indoor electric expansion valve (EV-2) is superheated, and the outdoor electric expansion valve (EV) is controlled. -1) is controlled to be fully open, and the thermal storage electric expansion valve (EV-3) is controlled to be fully closed. On the other hand, each solenoid valve (SV-1, SV-2, SV-3) is closed.

In this state, the refrigerant discharged from the compressor (21) exchanges heat with the outside air in the outdoor heat exchanger (23) and condenses. After that, this refrigerant is used for indoor electric expansion valve (EV-2)
, And evaporates in the indoor heat exchanger (24) to return to the compressor (21). This circulation operation cools the room.

-Cold heat storage operation- In this operation mode, as shown in FIG. 4, the four-way switching valve (22) is switched to the solid line side, and the heat storage electric expansion valve (EV-3)
Is adjusted to a predetermined opening, while other electric expansion valves (EV-1,
EV-2) is closed. In addition, the first and second solenoid valves (SV-1,
SV-2) is open, and the third solenoid valve (SV-3) is closed.

In this state, the heat storage circulation circuit (30) drives the pump (32) to circulate the heat storage water. On the other hand, in the refrigerant circulation circuit (20), the refrigerant discharged from the compressor (21) exchanges heat with outside air in the outdoor heat exchanger (23) and condenses, as indicated by the arrow in FIG. Thereafter, the refrigerant is decompressed by the heat storage electric expansion valve (EV-3), exchanges heat with the heat storage water in the supercooling heat exchanger (12), and evaporates. C). Thereafter, the refrigerant returns to the compressor (21).

In this operation, part of the refrigerant is
After shunting from the downstream side of the thermal storage electric expansion valve (EV-3) to the ice nucleus circuit (2b), the pressure is reduced by the capillary tube (CP), and then evaporated by the ice nucleus generator (13) to the compressor (21). Return. In the ice nucleus generator (13), the refrigerant exchanges heat with the heat storage water flowing through the water pipe (35) to generate ice blocks on the inner wall surface of the water pipe (35). Ice nuclei are generated around the ice blocks, and the ice nuclei are supplied to the supercooling elimination section (34).

The ice nucleus and the supercooled water are agitated in the supercool elimination section (34), and slurry-like ice for heat storage is generated and collected and stored in the heat storage tank (31).

In this operation, even if a relatively high-temperature refrigerant flows through the preheater (11) and ice flows into the water pipe (35), the refrigerant is heated and melted by the preheater (11) and supercooled. Ice is prevented from entering the heat exchanger (12).

In this operation mode, as shown in FIG. 5, the four-way switching valve (22) is switched to the solid line side, and the indoor electric expansion valve (EV-2)
Controls the opening degree to a predetermined value, and fully opens other electric expansion valves (EV-1, EV-1). In addition, the first and third solenoid valves (SV-1, SV-3)
Is open, and the second solenoid valve (SV-3) is closed.

In this state, in the heat storage circulation circuit (30), the pump (32) is driven to circulate cold water as heat storage water in the heat storage circulation circuit (30). On the other hand, in the refrigerant circulation circuit (20), a part of the refrigerant discharged from the compressor (21) passes through the four-way switching valve (22) as shown by the arrow in FIG. (23), and exchanges heat with outside air in the outdoor heat exchanger (23) to condense. Further, the other discharged refrigerant flows into the supercooling heat exchanger (12) through the hot gas passage (2c), and exchanges heat with cold water circulating in the heat storage circuit (30) to condense. The refrigerant condensed in the heat-source-side heat exchanger and the supercooling heat exchanger (12) is joined, decompressed by the indoor electric expansion valve (EV-2), and then evaporated in the indoor heat exchanger (24). Then, the room air is cooled and returned to the compressor (21). Thereby, the indoor cooling operation using the cold heat of the ice stored in the heat storage tank (31) is performed.

-Normal Heating Operation- In this operation mode, the four-way switching valve (22) is switched to the broken line side in FIG. 2, the outdoor electric expansion valve (EV-1) is controlled to a predetermined opening, and the indoor electric expansion valve is controlled. (EV-2) is controlled to the fully open state, and the heat storage electric expansion valve (EV-3) is controlled to the fully closed state. On the other hand, each solenoid valve (SV-1, SV-2, SV-3) is closed.

In this state, the refrigerant discharged from the compressor (21) flows into the indoor heat exchanger (24), exchanges heat with room air, condenses, and heats the room air. Thereafter, the refrigerant is decompressed by the outdoor electric expansion valve (EV-1), and then evaporates by exchanging heat with the outside air in the outdoor heat exchanger (23). Thereafter, the refrigerant returns to the compressor (21), and performs indoor heating by this circulation operation.

-Control operation- On the other hand, a control operation which is a feature of the present invention will be described. Each of the above-mentioned operations is controlled based on a command signal from the controller (40), while the pump (32) is controlled. The state of each actuator such as the compressor (21) is monitored by protection switches (51, 52,...).

That is, as shown in FIG. 6, a command signal is output from the controller (40) to the pump (32), the compressor (21), and the like. For example, as shown in FIG. When turned on, the excitation coil (M
C) is excited to drive the compressor (21). On the other hand, switch signals of the protection switches (51, 52,...) Are input to the controller (40).

For example, when an overcurrent flows through the compressor (21) and the first protection switch (51) of the compressor (21) is opened, the protection circuit (50) is shut off and the excitation coil of the electromagnetic contactor is turned off. (MC) is demagnetized and the compressor (21) stops. Further, the operation detection circuit (54) of the protection circuit (50) outputs an operation signal when at least one of the protection switches (51, 52,...) Is activated, and performs various types of abnormality processing based on the operation signal. Will be

The abnormal processing operation will be described with reference to the control flow shown in FIG.

First, when the control operation is started, step ST
In step 1, the output processing of each actuator is performed. That is, after the controller (40) receives and processes a state signal corresponding to a command signal such as operation, the process proceeds to step ST2.
An operation detection process of the protection circuit (50) is executed. In other words, it executes a process of extracting switch signals output from the plurality of protection switches (51, 52, ...).

Subsequently, the process proceeds to step ST3, where it is determined whether or not the protection switches (51, 52,...) Have been operated. Specifically, when any of the protection switches (51, 52,...) Is opened, the operation detection circuit (54) causes the protection switches (51, 52,.
Is detected and an operation signal is output. If this operation signal is not output, normal operation is performed. In this case, the determination in step ST3 is NO, and the process proceeds to step ST4, where normal operation is continued and the process returns.

On the other hand, in step ST3, if any one of the protection switches (51, 52,...) Is opened and the operation detection circuit (54) outputs an operation signal, the determination is YES and the process proceeds to step ST3. Moving to ST5, it is determined whether the compressor (21) is stopped.

Specifically, when the operation detection circuit (54) outputs an operation signal, the abnormality determining means (42) receives the operation signal and simultaneously determines whether or not the compressor (21) is operating. I do. If the compressor (21) is currently operating, the determination in step ST5 becomes YES and the
Move on to ST6, where the first protection switch (5
It is determined that 1) and the like have been activated, and the process proceeds to step ST7 to execute an output process of the content of the abnormality, that is, output an abnormality signal. Thereafter, the process proceeds to step ST8, where an abnormal stop is performed, the operation is stopped, and the process returns.

On the other hand, in step ST5, although the operation detection circuit (54) outputs the operation signal, the compressor (2)
If the operation is stopped in step 1), the determination is NO, and step S
Moving to T9, it is determined that the second protection switch (52) of the pump (32) has been operated, and the process proceeds to step ST7 to output an abnormal signal as described above. Thereafter, the process proceeds to step ST8, where an abnormal stop is performed, the operation is stopped, and the process returns.

That is, as shown in FIG. 8A, there is a state where only the pump (32) of the heat storage circulation circuit (30) is driven and the compressor (21) is stopped, for example, when detecting the water temperature. . In this state, the second protection switch (5
When 2) operates, it is necessary to stop the operation of the pump (32) because the pump (32) itself is abnormal.

On the other hand, as shown in FIG. 8C, the first protection switch (52) does not operate during the operation of the compressor (21) although the second protection switch (52) does not operate when the pump (32) alone is operated. If 51) etc. operate, it means that an abnormality has occurred in the compressor (21) other than the pump (32) and the outdoor electric expansion valve (EV-1).

At this time, since there is no abnormality in the pump (32) itself, the compressor (21) is stopped to stop the air conditioning operation, but the pump (32) is driven to circulate the heat storage water. . That is, for example, when the high pressure is excessively increased during the cooling operation using the cold heat, the pump (32) besides the compressor (21)
If the operation is stopped, the high-pressure refrigerant is not cooled and the high pressure does not decrease. Therefore, the pump (32) is driven to circulate the heat storage water.

-Effects of this Embodiment- As described above, according to this embodiment, the abnormality of the pump (32) and the abnormality other than the pump (32) can be distinguished, so that the conventional In the event of an abnormality, it is possible to take measures corresponding to the details of the abnormality as compared with the case where the operation is stopped uniformly, and it is possible to perform reliable abnormality processing.

In particular, there is a state in which the heat storage circulation circuit (30) is provided and only the pump (32) is driven.
Since the abnormality of the actuators other than the pump (32) and the pump (32) can be accurately determined, the pump (32) can be continuously operated when the pump (32) is normal.

As a result, for example, if the temperature of the high-pressure refrigerant rises abnormally during the cooling operation, the operation of the pump (32) can be continued to surely lower the temperature of the high-pressure refrigerant.

A plurality of protection switches (51, 52,...)
Is simply connected in series as in the prior art, and there is no need to provide a detection circuit for each input of the protection switch (51, 52,...). With the configuration, the content of the abnormality can be accurately determined.

[0080]

Other Embodiments In the present embodiment, the air conditioner (10) having the refrigerant circulation circuit (20) and the heat storage circulation circuit (30) has been described. However, the present invention is not limited to this.

Further, in the first aspect of the present invention, the air conditioner (10) without the heat storage circuit (30) may be used, that is, the air conditioner (23) having the water-cooled outdoor heat exchanger (23). In that case, at that time, as the first actuator,
A cooling water system pump (32) may be used.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a circuit diagram showing a refrigerant circulation circuit and a heat storage circulation circuit.

FIG. 3 is a water circuit diagram showing a heat storage circuit in detail.

FIG. 4 is a circuit diagram of a refrigerant circulation circuit and a heat storage circulation circuit during a cold heat storage operation.

FIG. 5 is a circuit diagram of a refrigerant circulation circuit and a heat storage circulation circuit during a cooling operation using cold storage heat.

FIG. 6 is a schematic configuration diagram showing a control system.

FIG. 7 is an electric circuit diagram showing a protection circuit.

FIG. 8 is a relationship diagram showing an operation relationship of the actuator.

FIG. 9 is a control flowchart showing an abnormality processing operation.

[Explanation of symbols]

 10 Heat storage air conditioner 12 Subcooling heat exchanger 20 Refrigerant circulation circuit 21 Compressor 23 Outdoor heat exchanger (heat source side heat exchanger) 24 Indoor heat exchanger 26 Refrigerant piping 30 Heat storage circulation circuit 31 Heat storage tank 32 Pump EV- 1, EV-2, EV-3 Electric expansion valve 40 Controller 41 Operation control means 42 Abnormality judgment means 50 Protection circuit 51, 52, 53 Protection switch 54 Operation detection circuit

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-223314 (JP, A) JP-A-6-3411693 (JP, A) JP-A-3-91648 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F24F 11/02 102 F25B 13/00 351

Claims (3)

(57) [Claims] A plurality of actuators (21, 32,...) Including a compressor (21) are provided, and an operation control means (41) drives and controls each of the actuators (21, 32,...) To perform an air conditioning operation. On the other hand, the one first actuator (32) is at least a second actuator (21,...) Which is another actuator.
In an air conditioner that performs air-conditioning operation by driving even at different times, a plurality of protection switches (51, 52, ...) that operate when an abnormality occurs
A protection circuit (50) connected to the plurality of protection switches (51, 52,...) And outputting one operation signal to the operation control means (41) when the protection switches (51, 52,. When the protection circuit (50) outputs an activation signal when the at least one second actuator (21) is activated, the abnormality of the second actuator (21,...) Is determined, while the abnormality of the one second actuator (21) is determined. When the protection circuit (50) outputs an operation signal at the time of a stop, an abnormality determination unit (42) that determines an abnormality of the first actuator (32) and outputs an abnormality determination signal to the operation control unit (41). An operation control device for an air conditioner, comprising: 2. The control device for an air conditioner according to claim 1, wherein at least the compressor (21), the heat source side heat exchanger (23), the expansion mechanism (EV-3), and the supercooling heat exchanger (12). And a refrigerant circulation circuit (20) in which the refrigerant is circulated and the refrigerant is circulated, and at least a heat storage tank (31) and a pump (32) are sequentially connected to circulate the heat storage medium and the supercooling heat exchanger (12)
And a heat storage circuit (30) for exchanging heat between the refrigerant and the heat storage medium in the subcooling heat exchanger (12), while the first actuator (32) is connected to the heat storage circuit (30). The second actuator (21,...) Is constituted by a pump (32).
0), the abnormality determining means (42) detects an abnormality of the second actuator (21,...) When the protection circuit (50) outputs an operation signal when the compressor (21) operates. On the other hand, when the protection circuit (50) outputs an operation signal when the compressor (21) is stopped, the abnormality of the pump (32) is determined and an abnormality determination signal is output, and the control of the air conditioner is characterized in that apparatus. 3. The control device for an air conditioner according to claim 1, wherein the protection circuit (50) includes a plurality of protection switches (51, 52,...).
Are connected in series and provided with an operation detection circuit (54), wherein the operation detection circuit (54) outputs an operation signal when any of the protection switches (51, 52, ...) is operated. Harmonic control device.