JP2010032111A - Integrated air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce operation current to prevent overcurrent caused by a load while preventing a user from feeling uncomfortable with respect to operation. <P>SOLUTION: During cooling operation or dehumidifying operation, the operation current supplied from a power source is changed by fluctuation of the load. When the operation current exceeds a reference value, rotational frequency of an air exhaust fan is increased. If such an increase cannot lower the operation current from the reference value, an expansion valve is throttled. Then, if the operation current cannot be still lowered from the reference value, rotational frequency of an air blowing fan is reduced. During this operation, air is blown out from the air conditioner all the time and thus, the user can recognize that the operation is performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an integrated air conditioner that exhausts exhaust heat generated by heat exchange to the outside through a duct and blows out cooled air into the room.

  Generally, in an integrated air conditioner, a compressor, an evaporator, a condenser, an evaporator fan, and a condenser fan are incorporated in a main body. In such an integrated air conditioner, Patent Document 1 discloses an exhaust air duct having an exhaust duct. When the cooling operation is performed, indoor air is taken in and the condenser is cooled with this air. The hot air is discharged outside the room through the duct. The taken-in indoor air is cooled by an evaporator and blown into the room as cold air. Drain water is generated by cooling the indoor air. The drain water is poured into a condenser and evaporated to treat the drain water.

Patent Document 2 describes that in an integrated air conditioner, in order to increase the efficiency of the refrigeration cycle, the temperature of the condenser is detected and the exhaust fan is rotationally controlled.
JP-A-5-256472 JP 2006-234249 A

  At the beginning of the cooling operation or dehumidifying operation, the amount of accumulated drain water is small and cannot be poured into the condenser. In addition, when the humidity is low, the amount of drain water generated is small. The refrigerant passing through the condenser is not sufficiently cooled, and the efficiency of the refrigeration cycle is deteriorated. As a result, the load applied to the compressor increases and the operating current supplied during operation increases. As the operating current increases, an overcurrent occurs. Then, the protection circuit is activated, the supply of power is cut off, and the operation stops. Further, when a thermal relay is provided to prevent the motor from burning due to an increase in load due to an overcurrent, the thermal relay is activated and the compressor is protected and stopped. In this case, several tens of minutes are required to restore the thermal relay. During this time, cooling operation or dehumidifying operation is not possible.

  Therefore, the driving of the exhaust fan for the condenser is controlled according to the temperature of the condenser. However, the maximum number of rotations of the exhaust fan is limited and is insufficient for improving the efficiency of the refrigeration cycle. Therefore, it is not always possible to eliminate the overload on the compressor, and there is still a possibility that the power supply may be cut off due to the breaker falling due to overcurrent. Furthermore, a thermal relay for protecting the compressor may be activated.

  Here, in order to reduce the load applied to the compressor, it is conceivable to control the blower fan for the evaporator for blowing out cool air together with the exhaust fan. By reducing the rotational speed of the blower fan, the heat exchange amount of the evaporator is reduced. The low-temperature refrigerant returns to the compressor, the load on the compressor is reduced, and the operating current is reduced.

  However, if the rotational speed of the blower fan decreases during the cooling operation, the amount of cool air blown out decreases. The user may feel uncomfortable whether the driving is abnormal, and may give the user an anxiety about the failure.

  In view of the above, the present invention provides an integrated air conditioner that enables continuous operation of cooling or dehumidification by preventing the stop of operation due to an operation overcurrent while wiping the user's uncomfortable feeling with respect to operation abnormality. Objective.

  In the present invention, a compressor, a condenser, a throttle device, and an evaporator are installed in a cabinet. During cooling operation, exhaust heat generated from the condenser is exhausted to the outside of the cabinet by an exhaust fan, and is supplied to the evaporator by a blower fan. In an integrated air conditioner that blows air and blows out the generated cold air into the room, a current detector that detects the operating current supplied during operation, a throttling device, an exhaust fan, and a blower so that the operating current does not become an overcurrent And a control device that controls at least one of the fans. During operation, the compressor is driven at a constant rotational speed.

  The control device first controls the throttle device or the exhaust fan in order to reduce the operating current, and finally controls the blower fan. The control device controls the exhaust fan, the throttle device, and the blower fan in this order in order to reduce the operating current.

  In addition, water supply means for pouring drain water generated from the evaporator into the condenser is provided, and the control device performs control on the water supply means prior to control on the blower fan in order to reduce the operating current.

  When the operating current exceeds the reference value, the control device operates the throttle device to increase the rotational speed of the exhaust fan and reduce the refrigerant flow rate for each of the exhaust fan, the throttle device, the blower fan, and the water supply means. Then, control is performed such as lowering the rotational speed of the blower fan and forcibly operating the water supply means. The control device operates the throttle device so as to reduce the refrigerant flow rate in a range where the refrigerant discharge temperature from the compressor does not exceed a certain temperature.

  In order to prevent the operating current from becoming overcurrent, increase the rotation speed of the exhaust fan, throttle the throttle by the throttle device, decrease the rotation speed of the blower fan, and pour drain water into the condenser. The load is reduced and the operating current is reduced.

  In such control, the first-stage control, for example, control for the exhaust fan is performed, but when the operating current does not fall below the reference value, the second-stage control, for example, control for the throttle device is performed. Even when these controls are performed independently or in combination, when the operating current does not fall below the reference value, the blower fan is finally controlled.

  Since the control over the blower fan is the last, the blower fan operates normally until then. The wind always blows out from the air conditioner, and the user recognizes that driving is being performed, and does not feel uncomfortable.

  The control device may simultaneously control the exhaust fan, the throttle device, and the water supply means. When a sudden overcurrent occurs, it can be dealt with and the operating current can be reduced at once.

  According to the present invention, when a load is applied during operation and the operation current is increased, the load applied to the compressor can be reduced and the operation current can be reliably reduced by combining a plurality of controls. As a result, it is possible to avoid that the power is cut off due to the breaker falling and the operation is stopped, or the thermal relay of the compressor is activated to stop the protection of the compressor, thereby enabling continuous operation.

  And by performing control with respect to a ventilation fan last, while controlling by another method, the air volume which blows off does not change. Therefore, the user recognizes that the user is driving as usual, and does not give the user a sense of discomfort with respect to abnormal driving. As a result, an air conditioner that provides a sense of security that it is operating properly can be realized.

  In the integrated air conditioner of the present embodiment, as shown in FIGS. 1 and 2, a cabinet 1 is equipped with a compressor 2, a condenser 3, an evaporator 4, and a throttle device (not shown). A cycle is formed. The air conditioner performs a cooling operation for generating cold air to cool the room. Therefore, the air conditioner includes a blower fan 5 for the evaporator 4, an exhaust fan 6 for the condenser 3, an exhaust duct 7, and a pump 8 for treating drain water generated by the cooling operation. Yes.

  The cabinet 1 has a structure surrounded by a front panel 10, a pair of left and right side plates 11, and a back plate 12, as shown in FIGS. The cabinet 1 is partitioned into an upper cooling chamber 13 and a lower exhaust heat chamber 14. The cooling chamber 13 and the exhaust heat chamber 14 are partitioned by a partition plate 15, and the upper and lower spaces are thermally insulated.

  The cooling chamber 13 accommodates the evaporator 4 and the blower fan 5, and the exhaust heat chamber 14 accommodates the compressor 2, the condenser 3, the exhaust fan 6, and the pump 8. In the cooling chamber 13, the evaporator 4 is disposed on the front side, and the blower fan 5 including a sirocco fan is disposed on the back side. In the heat exhaust chamber 14, the condenser 3 is disposed on the front side, and the exhaust fan 6 including a sirocco fan is disposed on the back side. Between the condenser 3 and the exhaust fan 6, the compressor 2 and the pump 8 are arrange | positioned at right and left, respectively. The condenser 3 is located below the evaporator 4, and the evaporator 4 and the condenser 3 are lined up and down. Note that an expansion valve is used as the expansion device, and is interposed in a pipe connecting the condenser 3 and the evaporator 4.

  The front side of the cabinet 1 is opened, and this opening is covered with the front panel 10. The evaporator 4 and the condenser 3 face the opening, and a gap 16 is formed between the front panel 10 and the evaporator 4 and the condenser 3. A filter 17 is detachably attached to the gap 16.

  A front suction port 20 and an air outlet 21 are formed in the front panel 10. Further, a side suction port 22 is formed between the front panel 10 and the side plate 11. The front suction port 20 is located in the center of the front panel 10 and is arranged in the vertical direction. The front suction port 20 and the side suction port 22 communicate with the gap 16. The blower outlet 21 is located in the upper part of the front panel 10, and is opened toward the diagonally upward direction from the horizontal direction. The air outlet 21 is provided with a louver 23, and the louver 23 is swung by a motor. The blower outlet 21 communicates with the cooling chamber 13, and a ventilation path is formed from the front suction port 20 and the side suction port 22 through the evaporator 4 to the blower outlet 21. Thereby, the suction from the front surface of the cabinet 1 and the forward blowing can be realized.

  The exhaust heat chamber 14 projects to the back side of the cooling chamber 13, and an exhaust port 24 is formed on the upper surface of the exhaust heat chamber 14. One end of a bellows-like duct 7 is attached to the exhaust port 24. The other end of the duct 7 is attached to the opening of the wall 25, and the exhaust heat chamber 14 communicates with the outside via the duct 7. Therefore, in the exhaust heat chamber 14, a ventilation path is formed from the front suction port 20 and the side suction port 22 through the condenser 3 to the exhaust port 24. This ventilation path communicates with the duct 7 and communicates with the outside.

  One end of the duct 7 is rotatable and detachable with respect to the exhaust port 24. That is, the fan guard 27 is rotatably fitted in the exhaust port 24 formed in the casing 26 of the exhaust fan 6. A duct connector 28 is provided at one end of the duct 7. The duct connector 28 is detachably attached to the fan guard 27, but the duct connector 28 is attached so as not to rotate with respect to the fan guard 27. As the duct 7 and the fan guard 27 rotate integrally, the duct 7 and the cabinet 1 rotate relatively.

  The other end of the duct 7 is detachably attached to the opening of the wall 25. That is, the mounting panel 31 for mounting the duct 7 is fixed to the window frame using the window 30 in the opening. The window 30 may be either a raising / lowering window or a sliding window, and the length of the mounting panel 31 can be varied according to the size of the window 30.

  A duct holder 33 is fitted into the attachment port 32 of the attachment panel 31, and a duct connector 34 provided at the other end of the duct 7 is detachably attached to the duct holder 33. By attaching the duct connector 34 to the duct holder 33, the duct holder 33 is attached so as not to be detached from the attachment panel 31. A rain guard 35 is attached to the outdoor side of the duct holder 33 so that rain does not enter. Therefore, by removing the duct connector 34 from the duct holder 33, the duct 7 can be removed from the window 30, and the duct holder 33 can also be detached from the mounting panel 31. Here, when the duct 7 is removed, the attachment port 32 of the attachment panel 31 remains open, so that a cover for closing the attachment port 32 is provided on the attachment panel 31. In FIG. 1, reference numeral 36 denotes a ventilation hole to which a ventilation fan can be attached.

  A wheel 40 is attached to the bottom surface of the cabinet 1. Therefore, this air conditioner can be moved and can be moved indoors with the duct 7 being extendable. Further, by removing the duct 7, the air conditioner can be carried into another room and can be used in any place.

  By the way, in the evaporator 4, when performing heat exchange of indoor air, the water | moisture content in air will condense and drain water will generate | occur | produce. A drain pan 41 that receives drain water is provided below the evaporator 4, and a drip pan 42 is provided below the drain pan 41. The drain pan 41 is accommodated in the dropping tray 42, and the dropping tray 42 is attached to the cabinet 1. The drain water dripped onto the drain pan 41 flows down to the dropping tray 42 and further flows from the dropping tray 42 to the condenser 3. The drain water evaporates while cooling the condenser 3 when passing through the condenser 3. A drain tray 43 is provided below the condenser 3, and drain water that has flowed through the condenser 3 accumulates in the drain tray 43. The drain tray 43 is placed on the bottom of the heat exhaust chamber 14, and the drain tray 43 is formed with a drain hole 44 and plugged. When the stopper is removed, drain water is discharged.

  And in order to process the drain water collected in the drain pan 43, the drain water is again led to the condenser 3 by the pump 8 and evaporated. The pump 8 is installed in a drain tray 43, a drain hose 45 is connected to the pump 8, and a drain hose 44 is connected to the dropping tray 42. The pump 8 and the dropping tray 42 constitute a water supply means.

  The pump 8 sucks the drain water and sends it to the dropping tray 42. The drain water flows down from the dropping tray 42 and is evaporated by the heat of the condenser 3. Thus, by draining the drain water, waste water treatment can be performed inside without draining outside. In the middle of the drain hose 45, a cock for switching the flow path is provided, and a drain pipe 46 is connected. By turning the cock, the flow path is switched to a flow path that circulates toward the dropping dish 42 and a flow path that is drained toward the drain pipe 46.

  As shown in FIG. 5, the air conditioner includes a control device 50 that drives and controls the compressor 2, the blower fan 5, the exhaust fan 6, the pump 8, and the expansion valve 9. A control device 50 including a microcomputer is built in the cabinet 1 and executes various operations such as a cooling operation, a dehumidifying operation, and a ventilation operation in response to an operation signal from a remote controller 51 or an operation switch provided in the cabinet. In addition, the front panel 10 is provided with a display 52 made of LEDs or the like, and the control device 50 controls the lighting of the display 52 according to various operations or warns when the drain water is full. The display 52 is turned on or blinked.

  In the cooling operation, room air is sucked from the front suction port 20 and the side suction port 22 by driving the blower fan 5 and passes through the evaporator 4 from the gap 16 of the front panel 10. At this time, the sucked air is cooled by the evaporator 4 and becomes cold air. The cold air is blown out into the room from the air outlet 21.

  On the other hand, by driving the exhaust fan 6, room air is sucked from the front suction port 20 and the side suction port 22 and passes through the condenser 3 from the gap 16 of the front panel 10. At this time, the sucked air is warmed by the condenser 3 and becomes warm air. The warm air passes through the duct 7 from the exhaust port 24 and is discharged outside the room.

  The drain water generated from the evaporator 4 by the cooling operation flows down and accumulates in the drain tray 43. When the drain water is accumulated up to a predetermined water level, the pump 8 is driven, and the drain water in the drain tray 43 is pumped up and guided to the dropping tray 42. The drain water drawn up flows down along the surface of the condenser 3 and evaporates. The drain water that has not evaporated is collected in the drain tray 43, pumped up again, and circulated until it evaporates. The water level of the drain water in the drain tray 43 is detected by a water level detector 53. When the water level detector 53 accumulates drain water in the drain pan 43 to a predetermined level, the control device 50 starts driving the pump 8. When it is detected that the water is full, the control device 50 stops the cooling operation by stopping the compressor 2, the pump 8, and the like.

  In the dehumidifying operation, the compressor 2, the blower fan 5, the exhaust fan 6, and the pump 8 are driven and controlled as in the cooling operation. However, the drain water collected in the drain tray 43 is not circulated, but the drain water is discharged from the drain pipe 46 by the operation of the cock. In this case, the duct 7 is removed. The air dehumidified through the exhaust heat chamber 14 is exhausted from the exhaust port 24 into the room. Therefore, dehumidification can be performed without changing the indoor temperature.

  In the ventilation operation, the compressor 2, the blower fan 5, and the pump 8 are stopped, and only the exhaust fan 6 is driven. Indoor air sucked from the front of the cabinet 1 is discharged from the heat exhaust chamber 14 through the duct 7 to the outside. At this time, outdoor air enters through the ventilation hole 36 of the wall 25 or the space between the rooms, and the room is ventilated.

  The air conditioner is provided with a temperature sensor 54 that detects the temperature of the refrigerant discharged from the compressor 2, a room temperature sensor 55 that detects the indoor temperature, and an outside air temperature sensor 56 that detects the outdoor temperature.

  The temperature sensor 54 is provided in contact with or close to the discharge pipe connecting the compressor 2 and the condenser 3, and detects the pipe temperature corresponding to the temperature of the refrigerant discharged from the compressor 2. The room temperature sensor 55 is provided in the vicinity of the front inlet 20 or the side inlet 22 of the cabinet 1. The outside air temperature sensor 56 is provided on the outdoor side of the mounting panel 31, and the outside air temperature sensor 56 and the control device 50 are connected by a cable routed along the duct 7.

  During the cooling operation or the dehumidifying operation, the control device 50 determines the initial rotational speeds of the exhaust fan 6 and the blower fan 5 at the start of the operation based on the room temperature. Alternatively, the initial rotational speed may be determined based on the room temperature set through the remote controller.

  The control device 50 drives and controls a drive motor for operating the compressor 2 during the cooling operation or the dehumidifying operation. This drive motor is a motor whose rotational speed is determined by the power supply voltage and the power supply frequency, and inverter control is not performed. Therefore, during operation, the compressor 2 has a constant rotational speed (constant speed). A drive current is supplied from the power source to the compressor 2 through the drive circuit, and the drive motor operates. If the compressor 2 is overloaded, an overcurrent exceeding the limit value flows. In such a case, the power supply is cut off and the operation is stopped, for example, when the protection circuit operates or the breaker falls. For example, when a thermal relay is provided in order to prevent the motor from burning due to an overcurrent flowing through the motor, the thermal relay is activated and the compressor 2 is protected and stopped. Thereby, the compressor 2 can be protected against damage.

  By the way, when a load is applied to the compressor 2, the operating current supplied from the power source increases. In particular, when the cooling operation or the dehumidifying operation is started or when the humidity is low, the drain water is small, so that the condenser 3 cannot be sufficiently cooled, and the temperature of the refrigerant does not decrease. Therefore, a load is applied to the compressor 2 and the rotation of the compressor 2 is kept constant, so that an increase in operating current becomes significant. As a result, the possibility of operating the breaker or the possibility of operating the thermal relay is increased. In particular, if the thermal relay is activated and the compressor 2 is protected and stopped, it takes several tens of minutes to restore the thermal relay. During this time, the cooling operation or the dehumidifying operation cannot be performed, which is inconvenient.

  Therefore, a current detector 57 that detects an operating current supplied from the power supply during operation is provided. The current detector 57 may be a known one, and detects the input current to the drive circuit using, for example, a current transformer. Alternatively, the current detector 57 may detect a drive current flowing through the compressor 2.

  In order to prevent overcurrent during cooling operation or dehumidification operation and to enable continuous operation, the control device 50 determines whether the compressor 2, the exhaust fan 6, the blower fan 5, and the The expansion valve 9 is controlled.

  In the control of the blower fan 5 for reducing the operating current, the control device 50 controls the rotation of the blower fan 5 based on the detected operating current. That is, the controller 50 reduces the rotational speed of the blower fan 5 when the detected operating current exceeds the reference value during operation.

  In addition, you may make it control the rotation speed of the ventilation fan 5 in steps according to an operating current value. Further, when the operating current becomes equal to or less than the reference value, the control device 50 returns the rotational speed of the blower fan 5 to the initial rotational speed. At this time, the rotation speed of the blower fan 5 is gradually increased. As a result, noise is generated when the rotational speed is returned at once, but this noise can be prevented.

  In the control of the exhaust fan 6, the control device 50 controls the rotation of the exhaust fan 6 based on the detected operating current. That is, the controller 50 increases the rotational speed of the exhaust fan 6 when the detected operating current exceeds the reference value during operation.

  Note that the control of the rotational speed of the exhaust fan 6 may be increased stepwise in accordance with the operating current value. Further, when the operating current becomes equal to or less than the reference value, the control device 50 returns the rotational speed of the exhaust fan 6 to the initial rotational speed. At this time, the rotational speed of the exhaust fan 6 is gradually reduced.

  In the control of the expansion valve 9, the control device 50 controls the operation of the expansion valve 9 based on the detected operating current. That is, during operation, the control device 50 operates to throttle the expansion valve 9 when the detected operating current exceeds the reference value.

  At this time, the control device 50 controls the operation of the expansion valve 9 based on the temperature detected by the temperature sensor 54 within the actual operating range where the refrigerant discharge temperature from the compressor 2 does not exceed a certain temperature. When the expansion valve 9 is throttled, heat exchange in the evaporator 4 is suppressed, and the temperature of the refrigerant increases. When the detected temperature becomes equal to or higher than a certain temperature, the control device 50 does not control the expansion valve 9. That is, the temperature of the refrigerant is increased and the temperature of the compressor 2 is also increased. If the compressor 2 becomes too high in temperature, the life of the compressor 2 is shortened, or the circulating oil in the compressor 2 reacts with the refrigerant to produce impurities, which are clogged and the refrigerant flow becomes worse. Such a bad effect occurs. For this reason, the control device 50 controls the expansion valve 9 in an actual operating range that does not exceed a certain temperature and does not impair reliability.

  And when the control apparatus 50 controls the ventilation fan 5, the exhaust fan 6, and the expansion valve 9 in order to reduce an operating current, it controls these three control objects in the order decided. In order to dispel the user's uncomfortable feeling during operation when overcurrent measures are taken, the control device 50 controls the exhaust fan 6 as a first step, then controls the expansion valve 9, and finally blows air. Control the fan 5.

  When the cooling operation or the dehumidifying operation is started, the control device 50 determines the initial rotational speeds of the blower fan 5 and the exhaust fan 6 based on the room temperature. The initial rotational speed is, for example, 500 rpm. During operation, the current detector 57 detects the operation current. When the operating current exceeds a reference value, for example, 15 A, the control device 50 executes a control operation for reducing the operating current.

  As shown in FIG. 6, the control device 50 first confirms that the rotational speed of the exhaust fan 6 is not the maximum rotational speed, and increases the rotational speed of the exhaust fan 6.

  By increasing the rotational speed of the exhaust fan 6, the amount of air sucked from the room and passing through the condenser 3 is increased. The amount of heat dissipated in the condenser 3 is increased, heat exchange is promoted, and the temperature of the liquid refrigerant coming out of the condenser 3 is lowered. The temperature of the refrigerant flowing through the evaporator 4 decreases, and a low-temperature gas refrigerant flows into the compressor 2. As a result, the load on the compressor 2 is reduced, so that the drive current of the compressor 2 is also reduced, and the total operating current supplied is reduced.

  The control device 50 confirms whether the operating current has fallen below the reference value. When the operating current is lower than the reference value, the control device 50 maintains the current operation. That is, the operation in which the rotational speed of the exhaust fan 6 is increased is continued. Thereafter, when the operating current decreases to a normal current value lower than the reference value, the rotational speed of the exhaust fan 6 is returned to a predetermined rotational speed.

  When the operating current is equal to or higher than the reference value, the control device 50 further increases the rotational speed of the exhaust fan 6. When the rotational speed of the exhaust fan 6 reaches a predetermined maximum rotational speed, the control device 50 starts control of the expansion valve 9 as a second stage. First, the control device 50 confirms that the discharge temperature of the refrigerant is not higher than a certain value, and operates the throttle valve 9 to throttle. The rotational speed of the exhaust fan 6 is the maximum rotational speed.

  By restricting the expansion valve 9, the flow rate of the refrigerant decreases. In a general separator type air conditioner, when the expansion valve 9 is throttled, the condensation pressure increases and the operating current increases. On the other hand, in the integrated air conditioner, because the heat exchangers such as the condenser 3 and the evaporator 4 are small and the amount of refrigerant is small, the condensing pressure is lowered by reducing the amount of refrigerant, and the load on the compressor 2 is reduced. As a result, the operating current decreases.

  When the control device 50 confirms that the operating current has fallen below the reference value, the control device 50 maintains the current operation. That is, the operation of increasing the rotational speed of the exhaust fan 6 while continuing the throttle of the expansion valve 9 is continued. Thereafter, the operation is returned to the operation before the control operation in the same manner as described above. The throttle of the expansion valve 9 is returned to the determined opening degree.

  When the operating current is equal to or greater than the reference value, the control device 50 further reduces the opening degree of the expansion valve 9. By the way, similarly to a general air conditioner, when the expansion valve 9 is throttled, the discharge temperature of the refrigerant increases. If the discharge temperature is too high, the compressor 2 is adversely affected and the reliability of the device is impaired. Therefore, the control device 50 checks whether or not the discharge temperature detected by the temperature sensor 54 is equal to or higher than a certain temperature.

  When the temperature is not higher than a certain temperature, the expansion valve 9 is further throttled. When the temperature is equal to or higher than the certain temperature, the control device 50 starts control of the blower fan 5 as a third stage. The control device 50 confirms that the rotational speed of the blower fan 5 is not the minimum rotational speed, and lowers the rotational speed of the blower fan 5. The rotational speed of the exhaust fan 6 is the maximum rotational speed, and the throttle of the expansion valve 9 is the maximum throttle in the actual operating range.

  By reducing the rotational speed of the blower fan 5, the amount of air sucked from the room and passing through the evaporator 4 is reduced. As a result, the amount of heat absorbed by the evaporator 4 decreases, and the temperature of the gas refrigerant flowing through the evaporator 4 decreases. Since the low-temperature gas refrigerant flows into the compressor 2, the load on the compressor 2 is reduced. As a result, the driving current of the blower fan 5 decreases, the driving current of the compressor 2 also decreases, and the supplied operating current decreases.

  The control device 50 confirms whether the operating current has fallen below the reference value. When the operating current is lower than the reference value, the control device 50 maintains the current operation. That is, with the rotation speed of the blower fan 5 lowered, the operation is continued with the expansion valve 9 set to the maximum throttle in the actual operating range and the exhaust fan 6 set to the maximum rotation speed. Thereafter, when the operating current decreases to a normal current value lower than the reference value, the operation before the control operation is restored.

  When the operating current is equal to or higher than the reference value, the control device 50 further reduces the rotational speed of the blower fan 5. Here, when the rotation speed of the blower fan 5 decreases, the amount of gas refrigerant flowing into the compressor 2 increases, and the amount of refrigerant circulation increases. As a result, the expansion valve 9 can be further throttled within the actual operation range. In other words, since the discharge temperature falls below a certain temperature, the control device 50 reduces the throttle of the expansion valve 9 and reduces the rotational speed of the blower fan 5.

  When the operating current does not fall below the reference value and the rotational speed of the blower fan 5 reaches a predetermined minimum rotational speed, the control device 50 stops the compressor 2 as a final stage. Thereby, the drive current of the compressor 2 does not flow, and the operation current for driving the fans 5 and 6 flows. In addition, the minimum rotation speed of the ventilation fan 5 may be 0, and the ventilation fan 5 stops.

  As described above, the load on the compressor 2 can be reduced by combining the three control objects of the exhaust fan 6, the expansion valve 9, and the blower fan 5 so that the operating current does not become an overcurrent. Can be lowered. At this time, since the blower fan 5 is controlled last, the rotation speed of the blower fan 5 does not change during the control operation, and the wind blows out from the air conditioner, so that the user does not feel uncomfortable during operation. .

  In particular, when the expansion valve 9 is throttled, the circulation amount of the refrigerant is reduced and the refrigerating capacity is reduced. Therefore, the user can realize an air conditioner that does not notice that the control operation for the abnormality is performed and does not give the user anxiety.

  Next, as another form of control operation, water supply means is added to the controlled object. The control device 50 forcibly operates the pump 8 of the water supply means in order to reduce the operating current. Normally, when the drain water has accumulated to a predetermined water level during the cooling operation, the control device 50 drives the pump 8 to pour the drain water into the condenser 3. However, not only during the cooling operation but also during the dehumidifying operation, the control device 50 performs water supply control for forcibly driving the pump 8 so that the operating current does not become an overcurrent.

  That is, when the operating current exceeds the reference value, the pump 8 is driven and drain water is poured into the condenser 3. The drain water evaporates, takes heat from the condenser 3, and the condensation temperature falls. The temperature of the liquid refrigerant coming out of the condenser 3 is lowered, the temperature of the refrigerant flowing through the evaporator 4 is lowered, and the low-temperature gas refrigerant flows into the compressor 2. As a result, the load applied to the compressor 2 is reduced, so that the drive current of the compressor 2 is reduced and the operation current is also reduced.

  And the control apparatus 50 performs this water supply control combining control with respect to the exhaust fan 6, the expansion valve 9, and the ventilation fan 5. FIG. At this time, control is performed on the four control targets in the order determined. The control device 50 controls the exhaust fan 6 as the first stage, performs control of the expansion valve 9 as the second stage, performs water supply control as the third stage, and finally controls the blower fan 5. . The control for the exhaust fan 6, the expansion valve 9 and the blower fan 5 is the same as described above.

  As shown in FIG. 7, when the control operation is started, the control device 50 first performs control to increase the rotational speed of the exhaust fan 6. Next, control to throttle the expansion valve 9 is performed. Also by these, the control device 50 drives the pump 8 when the operating current is equal to or higher than the reference value. When the pump 8 is already operating, the blower fan 5 is controlled.

  When the operating current falls below the reference value by driving the pump 8, the control device 50 maintains the current operation. That is, the operation with the throttle of the expansion valve 9 set to the maximum in the actual operation range and the rotational speed of the exhaust fan 6 set to the maximum rotational speed is continued. Thereafter, when the operating current decreases to a normal current value lower than the reference value, the operation before the control operation is restored. When the operating current is equal to or higher than the reference value, the control device 50 finally lowers the rotational speed of the blower fan 5 as the fourth stage.

  By performing the water supply control in this way, it is possible to reliably prevent the operating current from becoming an overcurrent even in an environment with a high load on the air conditioner. Therefore, it is possible to delay the start of the control for reducing the rotational speed of the blower fan 5, and to give the user a sense of security that the air conditioner is operating properly.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. The throttle device is a combination of a capillary tube and a flow rate adjustment valve, and the flow rate adjustment valve is controlled during the control operation.

  The order for the exhaust fan, the expansion valve, and the water supply control may be arbitrarily determined regardless of the above-described embodiment. Moreover, you may perform control with respect to these three control objects simultaneously. Furthermore, you may perform control with respect to a ventilation fan simultaneously. The operating current can be reduced immediately, which is effective when a sudden overcurrent occurs.

  When performing the control operation, the water supply control may always be performed regardless of the order. Since the effect of reducing operating current by water supply control is high, it is effective to use it together with other controls. Alternatively, the water level may be detected by detecting the water level of the drain water and when there is no drain water. The drive current for operating the pump unnecessarily can be eliminated.

Whole block diagram of integrated air conditioner of the present invention The figure which shows arrangement | positioning inside the exhaust heat chamber of an air conditioner External perspective view of the air conditioner viewed from the front side External perspective view of the air conditioner viewed from the back side Air conditioner control block diagram Flow chart of control operation to reduce operating current Flowchart of control operation for reducing operation current in another form

Explanation of symbols

2 Compressor 3 Condenser 4 Evaporator 5 Blower Fan 6 Exhaust Fan 8 Pump 9 Expansion Valve 50 Controller 54 Temperature Sensor 57 Current Detector

Claims (7)

The cabinet is equipped with a compressor, a condenser, a throttle device, and an evaporator. During cooling operation, exhaust heat generated from the condenser is exhausted to the outside by an exhaust fan, and blown to the evaporator by a blower fan. In an integrated air conditioner that blows out the generated cold air into the room, at least one of a current detector that detects an operating current supplied during operation and an expansion device, an exhaust fan, and a blower fan so that the operating current does not become an overcurrent And a control device for controlling one, the control device first controls the throttle device or the exhaust fan to lower the operating current, and finally controls the blower fan. Harmony machine. 2. The integrated air conditioner according to claim 1, wherein the control device controls the exhaust fan, the throttle device, and the blower fan in this order in order to reduce the operating current. The water supply means for pouring drain water generated from the evaporator into the condenser is provided, and the control device performs control on the water supply means before control on the blower fan in order to reduce the operating current. The integrated air conditioner according to 1 or 2. 4. The integrated air conditioner according to claim 3, wherein the control device simultaneously controls the exhaust fan, the throttle device, and the water supply means. When the operating current exceeds the reference value, the control device operates the throttle device to increase the rotational speed of the exhaust fan and reduce the refrigerant flow rate for each of the exhaust fan, the throttle device, the blower fan, and the water supply means. 5. The integrated air conditioner according to claim 3, wherein control is performed such as lowering the rotational speed of the blower fan and forcibly operating the water supply means. The integrated apparatus according to any one of claims 1 to 5, wherein the control device operates the expansion device so as to reduce the flow rate of the refrigerant in a range where the discharge temperature of the refrigerant from the compressor does not exceed a certain temperature. Air conditioner. The integrated air conditioner according to any one of claims 1 to 6, wherein the compressor is driven at a constant rotational speed during operation.

Images