JP2002195706A - Air conditioner and control device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save resources by reducing the number of connecting wires in an air conditioner (room air conditioner). SOLUTION: A compressor is driven by a motor 450 in an outdoor control unit 400 of an outdoor unit. A fan motor 29B of an outdoor heat exchanger and one end of the motor 450 are connected through a common power wire 220, while the other end is connected to a compressor control wire 221. An indoor control unit 300 of an indoor unit and the outdoor control unit 400 are connected through only the two wires, the wire 220 and the wire 221. A compressor driver C9 constituted of a driver, a relay (coil) and a relay contact is disposed on the wire 221 in the indoor control unit 300. Power supply to the fan motor 92B and the motor 450 is controlled through a microcomputer 330 by switching on/off the compressor driver C9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner provided with a heat pump type refrigeration cycle, and an air conditioner control device for controlling the operation of the air conditioner.

[0002]

2. Description of the Related Art FIG. 32 is a basic block diagram showing an example of a refrigeration cycle and a control device thereof in a conventional air conditioner.
FIG. 33 is an electric block diagram of the air conditioner, and FIG.
Correspond to the respective elements in FIG. 33 and combinations thereof. As shown in FIG. 32, the compressor 4, the flow path switching valve 10
0, the indoor heat exchanger 9A, the expansion device 10A, the outdoor heat exchanger 9B, and the accumulator 200 constitute a refrigeration cycle A.

[0003] The indoor control unit 300 and the outdoor control unit 400
The common power supply line 220, the compressor control line 221, the outdoor heat exchanger control line 620, and the flow path switching valve control line 710 are connected by four electric wires, and four terminals are connected to the terminal block on the indoor unit side and the outdoor unit side. Are provided with four terminals.
The compressor 4 is driven using a compressor power source 450, which is an AC motor having a constant operating frequency, as a power source. The power is a single-phase alternating current, and is supplied to an AC / DC converter 320 via a power switch 310, and DC power converted into various internal voltages is supplied to each unit. The microcomputer 330 controls a flow path switching valve driving unit 406 including a driver, a relay, and a switch, an outdoor heat exchanger driving unit C8, and a compressor driving unit C9. Then, electric power is supplied to the coil (flow path switching valve driving source) 101, the fan motor (outdoor heat exchanger driving source) 401, and the compressor power source 450 of the flow path switching valve 100.

The coil temperature Tc 'of the outdoor heat exchanger 9B in the outdoor control section 400 is detected by a temperature sensor 403, and is taken into the indoor control section 300 via a 2P connector. In addition, the indoor control unit 300 detects the indoor temperature Ta with the temperature sensor 302, and
3, the temperature (coil temperature) Tc of the indoor heat exchanger 9A is detected. In addition, by receiving a signal of a remote controller 500 such as an infrared type by the receiving unit 304, the indoor control unit 300
The operation switching and setting can be performed by remote control operation.

Further, as shown in FIGS. 34 and 35, the expansion device 10A uses, for example, a capillary which is a fixed expansion device, and is set so that the flow rate of the refrigerant is different between the heating mode and the cooling mode. . Here, a first example shown in FIG. 34 is a heating-dedicated capillary 10Ah and a check valve 1
0H, a cooling-only capillary 10Ac and a check valve 10C, and the second example shown in FIG. 35 includes a heating-only capillary 10Ah, a cooling / heating shared capillary 10Ac, and a check valve 10C. ing.

[0006]

The prior art described above requires an electric wire for driving and controlling the fan motor of the outdoor heat exchanger and an electric wire for driving and controlling the coil of the flow path switching valve. . In addition, when performing defrosting control during the heating operation, it is necessary to additionally provide a temperature sensor wire from the indoor unit to the outdoor unit as a means for detecting the temperature of the outdoor heat exchanger of the outdoor unit. As described above, according to the related art, there is a problem that the extra wiring member is required, so that it becomes economically expensive, and that it is not preferable in terms of global resources.

According to the prior art, the first example shown in FIG. 34 is provided with dedicated throttle devices for cooling and heating, so that the design is relatively easy. Since extra members are required, there is a problem that it is not preferable in terms of the earth resources or the global environment. Further, the second example shown in FIG. 35 has a problem in that the design is difficult and the number of man-hours is extra because the capillary is shared, so that it becomes economically expensive. In addition, as shown in FIG. 36, a physical diagram of the second example of FIG. 35 is an example of 4 turns and 7 turns.
In the case of 2 kW, 2.5 kW, 2.8 kW, and 3.2 kW models, it is necessary to determine the number of turns according to each capacity, and the design man-hours are also extra, and the types of piping members increase. There was a problem that it would be economically expensive in that respect.

The present invention reduces the number of connecting wires to reduce the cost and save resources, and also reduces the number of design steps by reducing the number of types of piping members by replacing the capillary of the expansion device with an electric expansion device. It is an object of the present invention to provide an air conditioner and a control device for the same, which reduce the cost and save resources.

[0009]

According to a first aspect of the present invention, there is provided an air conditioner including a heat pump type refrigeration cycle in which a flow path of a fluid is separated into an indoor unit and an outdoor unit. There are two control lines connecting the indoor unit and the outdoor unit.

According to a second aspect of the present invention, there is provided an air conditioner including a heat pump type refrigeration cycle in which a flow path of a fluid is separated into an indoor unit and an outdoor unit, wherein the physical quantity of the fluid is controlled. A flow path switching valve that switches a flow path of the fluid using non-electric power generated by the operation, and two control lines connecting the indoor unit and the outdoor unit are provided. And

According to a third aspect of the present invention, there is provided a control device for an air conditioner, which is a flow path switching valve of the air conditioner, wherein the non-electric power generated by controlling a physical quantity of the fluid is used for the fluid control. In an air conditioner control apparatus for controlling an air conditioner having a flow path switching valve for switching a flow path mode of the air conditioner, two control lines connecting an indoor unit and an outdoor unit of the air conditioner are provided with two control lines. It is characterized by comprising.

According to a fourth aspect of the present invention, there is provided a control device for an air conditioner, wherein the control device is a flow path switching valve for the air conditioner, the non-motorized power generated by controlling a physical quantity of the fluid. A control line for connecting an indoor unit and an outdoor unit of the air conditioner with a common power supply line. , And a compressor control line.

According to a fifth aspect of the present invention, there is provided a control device for an air conditioner, which is a flow path switching valve which is controlled to be switched by a predetermined operation of a compressor of the air conditioner. An air conditioner control apparatus for controlling an air conditioner having a flow path switching valve for switching a flow mode from a cooling mode to a heating mode or a heating mode to a cooling mode by an operation, the indoor unit and the outdoor unit of the air conditioner And a control line connecting between the control unit and the control unit. The control unit includes a common power supply line and a compressor control line, and the outdoor unit includes outdoor control means.

According to a sixth aspect of the present invention, there is provided an air conditioner control apparatus including a coilless four-way valve, wherein an indoor unit and an outdoor unit are connected by two electric wires,
A step of controlling the opening degree of the expansion device by the control means of the outdoor unit.

A control device for an air conditioner according to a seventh aspect of the present invention is an air conditioner having a coilless four-way valve, wherein an indoor unit and an outdoor unit are connected by two electric wires,
The control means of the outdoor unit includes a step of controlling the opening degree of the expansion device, and further determines the flow path mode of the refrigerant, sets the first predetermined opening degree in the heating mode, and sets the second predetermined opening degree in the cooling mode. The method is characterized by comprising a step of setting a degree.

An air conditioner control device according to an eighth aspect of the present invention is an air conditioner having a coilless four-way valve, wherein an indoor unit and an outdoor unit are connected by two electric wires,
The outdoor unit control means includes a step of controlling the opening degree of the expansion device, and further, at the start of operation of the outdoor unit, the opening degree of the expansion device is set to the first predetermined opening degree in the heating mode and the opening degree in the cooling mode. The method further comprises a step of averaging the opening degree with the second predetermined opening degree to obtain a third predetermined opening degree.

According to the air conditioner of the first aspect of the present invention,
3 control lines connecting the indoor unit and the outdoor unit
Compared to the case of more than one book, it becomes cheaper and saves resources.

According to the air conditioner of claim 2 of the present invention,
Since the flow path switching valve is switched by non-motorized power, there is no need for an electric wire for driving and controlling the coil and the like of the flow path switching valve,
3 control lines connecting the indoor unit and the outdoor unit
Compared to the case of more than one book, it becomes cheaper and saves resources.

According to the control device for an air conditioner of the third aspect of the present invention, since the flow path switching valve is switched by a non-motorized power, it is possible to drive and control the coil of the flow path switching valve in the air conditioner. No electric wires are required, and the cost is reduced and resources are saved as compared with the case where three or more control lines connect between the indoor unit and the outdoor unit.

According to the control device for an air conditioner of the fourth aspect of the present invention, the same operation and effect as those of the third aspect can be obtained.

According to the air conditioner control device of the fifth aspect of the present invention, the same operation and effect as those of the third aspect are obtained, and the outdoor control means overloads the outdoor heat exchanger in the cooling operation. By detecting the state, the power supply to the motor of the compressor, the fan motor of the outdoor heat exchanger, and the like can be cut off, which saves energy without increasing the number of wires.

According to the control device for an air conditioner of the present invention, the same operation and effect as those of the third embodiment can be obtained, and the opening degree of the expansion device can be controlled by the control means of the outdoor unit. By using the diaphragm device of the formula,
Design man-hours can be significantly reduced. In addition, by reducing the number of types of piping members, the number of design steps can be reduced, the cost can be reduced, and resources can be saved.

According to the control apparatus for an air conditioner of the present invention, the same effect as that of the sixth aspect can be obtained, and the control means of the outdoor unit controls the expansion device in the heating mode and the cooling mode. The opening can be suitably controlled.

According to the control apparatus for an air conditioner of claim 8 of the present invention, the same operation and effect as those of claim 6 can be obtained, and the opening degree of the expansion device in the heating mode can be controlled by the control means of the outdoor unit. Of the first predetermined opening degree and the second in the cooling mode
Since the opening is controlled to be a third predetermined opening obtained by averaging the opening with the predetermined opening, the opening of the expansion device can be controlled in accordance with the capacity of the air conditioner. Compared to the case where a capillary is used, since one type of electric expansion device can be used, the number of piping members can be significantly reduced.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of an air conditioner control apparatus according to the present invention will be described with reference to the drawings.

First, the flow path switching valve 100 in the embodiment
An example will be described. 29 and 30 are cross-sectional views of the flow path switching valve 100 in the embodiment. FIG. 29 is a cross-sectional view showing a stopped state of the compressor 4 or a state in which the flow path is being switched, and FIG. It is shown in cross section.
The flow path switching valve 100 communicates with a valve housing 61, which is cylindrical and has a reduced upper diameter, a substantially cylindrical main valve body 62, a valve seat 63, a center shaft 64, and a discharge port of the compressor 4. Discharge pipe 5, accumulator 2 connected to the suction port of compressor 4
The main components are a suction pipe 6 communicated with 00 and conduits 7 and 8 connected to two indoor and outdoor heat exchangers 9A and 9B, respectively.

The main valve body 62 is rotatably supported on a central shaft 64 by a through hole 621 in the valve housing 61 so as to be rotatable about the central shaft 64, and is vertically movable in the direction of the rotational axis (vertical direction in FIG. 29). It is movable. Further, a first spring 65 whose upper end is fitted to the boss portion 622a of the retainer 622 is disposed in a vertical hole formed above the central shaft 64, whereby the main valve body 62 is It is urged to be separated from the valve seat 63. A second spring 66 compressed between the step portion of the center shaft 64 and the valve seat 63 is provided around the center shaft 64 on the valve seat 63 side. Is applied.

A retainer 62 is provided in a through hole 621 of the main valve body 62.
2, two balls 62c are held, and these balls 62c are engaged in guide grooves formed around the central shaft 64. Note that the ball 62c is attached to the main valve body 62.
The ball 62c itself is rotatable with respect to the retainer 622 in the rotation direction and the vertical direction of the main valve body 62. Then, when the main valve body 62 moves up and down, the ball 62c moves following the cam groove, and the main valve body 62 moves up and down once along the central axis 64 every time the valve seat 6 moves.
The seat is rotated 180 ° with respect to 3.

The main valve body 62 is formed with a low-pressure side communication groove 62a and a high-pressure side communication path 62b.
2b is formed so as to open to the valve seat 63 side and the side surface of the main valve body 62, avoiding the low pressure side communication groove 62a. Also,
A gap is provided between the side surface of the main valve body 62 and the inner surface of the valve housing 61, and the high-pressure side communication passage 62 b communicates with the upper space in the valve housing 61 and the discharge pipe 5 through this gap. You.

With the above configuration, when the compressor 4 is stopped, the main valve body 62 is separated from the valve seat 63 by the urging force of the first spring 65. In this state, when the compressor 4 starts operating, the high-pressure refrigerant flowing into the valve housing 61 moves the main valve body 62 toward the valve seat 63 against the urging force of the first spring 65. Works.
Thereby, the main valve body 62 moves to the valve seat 63 side while rotating in the valve housing 61, and rotates 90 °. And
Since the compressor 4 is operated with the ability to seat the main valve body 62, the compressor 4 further moves against the urging force of the second spring 66, and the main valve body 62 sits on the valve seat 63 as shown in FIG. I do. In this state, the discharge pipe 5 communicates with the conduit 8 and the suction pipe 6 communicates with the conduit 7, and the flow path mode of the flow path switching valve 100 is the cooling mode.

Thereafter, when the operation of the compressor 4 is stopped,
Since the pressure of the refrigerant flowing into the inside of the valve housing 61 decreases, the second spring 66 and the first spring 65
The main valve body 62 is separated from the valve seat 63 by the urging force of the above, and the main valve body 62 returns to the top dead center rotated 90 ° from the seated position in the cooling mode. Next, in this state, when the compressor 4 starts operating, the main valve body 62 is further rotated by 90 ° to rotate the valve seat 6.
3, the discharge pipe 5 communicates with the conduit 7, and the suction pipe 6 communicates with the conduit 8. Therefore, the flow path switching valve 1
The flow path mode of 00 is a heating mode.

FIG. 31 is a graph showing the spring characteristics of the first spring 65 and the second spring 66. The horizontal axis indicates the vertical movement distance (m) of the main valve body 62 from the main valve body return position.
m), the vertical axis corresponds to the spring load (N) corresponding to the biasing force of each spring. The first spring 65 is a weak spring, and as shown in FIG. 31, the main valve body 62 reaches the point a and approaches the valve seat 63 by a small change of a small load.
Further, the second spring 66 is applied with an initial load greater than that of the first spring 65, and the main valve is maintained until the force for lowering the main valve body 62 becomes a force that opposes the initial load of the second spring 66. The body 62 stays at the point a without descending. When the force for lowering the main valve body 62 exceeds the initial load of the second spring 66, the main valve body 62 is stopped.
Descends and sits on the valve seat 63.

That is, in this embodiment, the main valve body 62
The threshold value of the driving force at which the seat can be seated is set at the position immediately before the switching (when the distance between the lower end surface of the main valve body 62 and the upper surface of the valve seat 63 is 0.
(At a position of about 5 mm). Thereby, whether to sit or not to sit can be easily, reliably, and accurately set by switching the operation capability of the compressor 4.

For example, by operating the compressor 4 at the first predetermined capacity (for example, 30 Hz), the main valve body 62 is set to reach the point a, and the compressor 4 is further operated at the second predetermined capacity (for example, 60 Hz). ), The main valve body 62 is set to pass through the point a and reach the main valve body seating position.

As described above, the flow path switching valve 10 of this embodiment
In the case of 0, in order to switch the flow path of the flow path switching valve, current is not supplied to the electromagnetic coil of the flow path switching valve, the motor, or the like, for example, by a relay contact or a semiconductor switch. That is, the flow path switching valve 100 is called a coilless four-way valve.

(First Embodiment) FIG. 1 is a principle block diagram of a refrigeration cycle of an air conditioner and a control device thereof according to a first embodiment of the present invention, and FIG. 2 is a block diagram of the air conditioner (and control device). It is an electric block diagram, and this 1st embodiment is an embodiment of an area-limited type air conditioner which does not require a defrosting operation. This air conditioner includes a control device C, an indoor heat exchanger drive source 301, an outdoor heat exchanger drive source 401, and a compressor drive source 450, and controls the refrigeration cycle A. Also,
In the refrigeration cycle A, the compressor 4, the flow path switching valve 100,
The accumulator 200, the outdoor heat exchanger 9B and the expansion device 10A are provided in the outdoor unit, and the indoor heat exchanger 9A
Are provided in the indoor unit.

In the control device C, the input unit C2 is
Corresponds to the receiving unit 304 provided in the indoor unit for receiving the infrared signal transmitted from the transmitting unit 500a of the remote controller 500 or a manual switch (not shown). The detection unit C3 includes a temperature sensor 302 that detects the indoor temperature Ta, and a coil temperature Tc of the indoor heat exchanger 9A.
Corresponding to the temperature sensor 303 for detecting the Further, the power failure detection unit C4 corresponds to a voltage detector (not shown),
The semi-fixed storage unit C5 corresponds to the EEPROM 340. Further, the indoor heat exchanger driving section C7 outputs a control signal to the indoor heat exchanger driving source (cross flow fan 91A) 301, and the heat exchange capacity of the indoor heat exchanger 9A is controlled. The compressor driving unit C9 is configured by, for example, a driver, a relay (coil), and a relay contact, and controls supply of electric power to a compressor power source (electric motor) 450. Note that the indoor heat exchanger driving unit C7 is a unit that functions by executing a control program described below.

Further, as shown in FIG. 2, the control device C
The microcomputer 330 includes an indoor control unit 300, and sends a control signal to the compressor driving unit C9 based on a result of a predetermined process. On the other hand, the outdoor heat exchanger drive source 401 (outdoor fan motor 92B) and the electric motor 450 for driving the compressor 4 are connected in parallel, and the common power supply line 220 and the compressor control are connected via the outdoor terminal block and the indoor terminal block. The line 221 allows the indoor control unit 3
00 is wired. Here, as described above, the switching control of the flow path switching valve 100 configuring the refrigeration cycle A is performed using non-electric power generated by the control device C controlling the physical quantity (pressure) of the fluid. Since it is a so-called coilless four-way valve, the flow path switching valve 100 is not shown in the electric block diagram of FIG. This is the same in the second to sixth embodiments described later.

The first embodiment operates, for example, as follows. First, the power switch 310 is turned on, the microcomputer 330 of the indoor control unit 300 functions, executes a predetermined program described later, and controls, for example, the compressor driving unit C9. Then, for example, when a cooling operation or a heating operation is requested by the remote controller 500, the microcomputer 330 turns on / off the compressor driving unit C9 according to the operation command. This ON
In synchronization with / OFF, the electric motor 450 (compressor 4) and the outdoor fan motor 92B (401) are also turned ON / OFF to perform the cooling operation or the heating operation.

Here, the flow path switching valve 100 is a coilless four-way valve configured to alternately switch the flow path mode such as cooling → heating → cooling or heating → cooling → heating as described above. If the operation is started and the flow path mode is different from the requested flow path mode, the compressor driving unit C9 is temporarily turned off for a predetermined time (for example, 2 minutes).
If the compressor drive unit C9 is turned on again later, the required flow mode is set. Therefore, comfortable air-conditioning operation can be realized without any trouble.

The microcomputer 330 of the indoor control unit 300
Detects the coil temperature Tc of the indoor heat exchanger 9A by the temperature sensor 303. Therefore, it is determined whether or not the control according to the requested operation is being performed by the indoor heat exchanger 9.
It becomes possible by monitoring the coil temperature Tc of A. For example, in response to a request for cooling operation, the compressor drive unit C
9 is turned on, and the coil temperature Tc after a predetermined time is room temperature (indoor temperature) Ta, or the coil temperature Tc before the compressor 4 is started.
If it gets higher, it is actually heating. Also, in response to the request for the heating operation, if the compressor drive unit C9 is turned on and the coil temperature Tc after a predetermined time becomes lower than the room temperature (indoor temperature) Ta or the coil temperature Tc before the compressor 4 is started, Actually, it is in cooling operation.

In the first embodiment, since the indoor control unit 300 only has the microcomputer 330 as a means for controlling, the microcomputer 330 of the indoor control unit 300 makes all the judgments and It is preferably controlled to perform the air-conditioning operation.

Next, the microcomputer 33 of the indoor control unit 300 in the first embodiment (and the second to sixth embodiments described later).
The control operation by 0 will be described based on a flowchart. FIG. 3 is a flowchart of the main routine. This main routine is first started by a power-on reset of the first priority level, and the RAM starts at step S11.
"Initialization processing-1" such as all clear, and the process proceeds to step S13. In addition, the second start is performed at the second priority level due to the reset of the watchdog timer, the release of the standby state (Wait), and the like.
Proceed to 13.

In step S13, it is determined whether or not the data in the EEPROM is all 1s. If the data is all 1, the process proceeds to step S15.
At 14, the data of the operating state of the EEPROM is stored in the RAM, and the process proceeds to step S15. In step S15, various timers are started, and in step S16, the indoor control unit 300
Is performed, and the process proceeds to step S17. In addition,
At the time of factory shipment, etc., the data in the EEPROM is all 1s.
S ", but" NO "for the second and subsequent power feedings.

Next, in step S17, the input signal is calculated,
A comparison and determination process is performed, and it is determined in step S18 whether or not the data is normal as a result of the process. If the data is abnormal, the operation of the air conditioner is stopped in step S19, the mask timer is started in step S101, and the process waits for a predetermined time. Then, in step S102, it is determined whether or not the degree of abnormality is such that the standby state (Wait) is required. If not, the process returns to step S17. If necessary, the data of the operating state of the RAM is stored in step S103. Is stored in the EEPROM, and a standby state (Wait) is set.

On the other hand, if the data is normal in step S18, output processing such as display is performed in step S104.
In step S105, control processing based on an operation command is performed by a subroutine of FIG. 4 described later, and the process proceeds to step S106. Then, in step S106, the flow path switching valve 100
It is determined whether or not the position of the valve is as required, and if it is as requested, the process returns to step S17, and if not, the process at step S19 and thereafter is performed at the time of abnormality.

The processing in FIG. 4 is a subroutine of step S105 in FIG. In the subroutine of the control process based on the operation command in FIG. 4, in step S21, for example, it is determined whether or not the request command of the remote controller is "operation".
If not, an operation stop control process is performed in step S21 ', and the process returns to the original routine. If "operation", it is determined whether or not the operation mode requested in step S22 is "automatic". If "auto", automatic operation control processing is performed in step S22 'and the process returns to the original routine. I do. If it is not "automatic", it is determined whether or not the operation mode requested in step S23 is "heating", and if it is "heating", a heating operation control process is performed in step S23 'and the process returns to the original routine. I do. If it is not “heating”, step S24
It is determined whether or not the requested operation mode is "cooling". If it is "cooling", a cooling operation control process is performed in step S24 'and the process returns to the original routine. If not "cooling", a dehumidifying operation control process is performed in step S25, and the process returns to the original routine.

FIG. 5 shows the operation stop control processing in step S21 'in FIG. 4, the automatic operation control processing in step S22', the heating operation control processing in step S23 ', and step S24'.
It is a flowchart explaining the outline of the cooling operation control processing of FIG. 7 and the dehumidification operation control processing of step S25. FIG. 5 shows an example of the heating operation control process, but the other processes have the same step structure, and the corresponding processes will be described each time.

First, in step S31, it is determined whether or not the result of various processing is "operation". If "operation", the process returns to the original routine. If "operation", the process returns to step S3.
It is monitored whether or not the room temperature Ta deviates from the set value by a predetermined value in step S2.
Turn on 9 (relay) to start the air conditioner.

That is, in the case of the cooling operation control process, as shown in FIG. 6A, for example, it is determined whether the room temperature Ta is higher than a set value (eg, 22 ° C.) by a predetermined value (eg, 1.2 ° C.) or more. Monitor and set a predetermined value higher than the set value (23.2 ° C).
), The air conditioner is started in step S33.
In the case of the heating operation control process, for example, as shown in FIG. 6B, it is monitored whether the room temperature Ta is lower than a set value (for example, 22 ° C.) by a predetermined value (for example, 1.2 ° C.), If the temperature is lower than the set value by a predetermined value or more (to 20.8 ° C.), the air conditioner is started in step S33. In the case of the dehumidification operation control process, for example, as shown in FIG. 6 (C), it is monitored whether the room humidity Rh is higher than a set value RH1 by a predetermined value (RH2−RH1) or more. Higher than (R
If H2), the air conditioner is started in step S33.

Next, in step S34, the operation of the air conditioner is continued. In step S35, it is determined whether or not the room temperature Ta has exceeded a set value. If it exceeds, step S3
At 6, the compressor drive unit C9 (relay) is turned off to stop the air conditioner.

That is, in the case of the cooling operation control process, for example, as shown in FIG. 6A, it is determined whether or not the room temperature Ta is lower than a set value (for example, 22 ° C.). If the value is lower than the set value, the air conditioner is similarly stopped in step S36.
In the case of the heating operation control process, for example, as shown in FIG. 6B, it is determined whether or not the room temperature Ta exceeds a set value (for example, 22 ° C.). And if it exceeds the set value, step S
At 36, the air conditioner is stopped. In the case of the dehumidifying operation control process, for example, as shown in FIG.
It is determined whether or not h is below the set value RH1, and if not, the process returns to step S34. If it is below the set value, the air conditioner is stopped in step S36.

Next, at a step S37, the process waits for a predetermined time.
In step S38, it is determined whether or not the flow path mode is to be changed next time. If so, the process proceeds to step S301. If not, the compressor driving unit C9 (relay) is turned on in step S39. To start the air conditioner,
After a predetermined time, the compressor drive unit C9 is turned off to stop the air conditioner and wait. In step S301, it is determined whether the result of each output process is “stop”. This “stop” is determined by the “compressor drive unit C”
It is not "OFF of 9" but "stop of operation" of the air conditioner by a remote controller or the like. If it is not "stop", the process returns to step S32. If it is stopped, another process is performed and the process returns to the original routine.

Incidentally, in the case of the automatic operation control processing, any of heating, cooling, and dehumidification is performed.
The same processing as heating, cooling, or dehumidification is performed as necessary.

FIG. 7 is a flowchart showing an example of the freezing prevention process of the indoor heat exchanger 9A during the cooling operation. This process is a process of the microcomputer 330 and is included in other processes of the cooling operation control process. First, step S41
The pipe temperature (coil temperature) Tc of the indoor heat exchanger 9A is 2
It is determined whether the temperature is lower than 2 ° C., and if the temperature is not lower than 2 ° C., the process proceeds to another process. . Next, in step S43, the control unit waits for a predetermined time and turns on the compressor drive unit C9.
9 is turned off and the process proceeds to step S44. Step S44
Then, it monitors whether the coil temperature Tc exceeds 10 ° C., and if it exceeds 10 ° C., turns on the compressor drive unit C9 in step S45 to start the operation of the air conditioner, and proceeds to another process.

FIG. 8 is a flow chart showing an example of the process of preventing the cold air of the indoor heat exchanger 9A during the heating operation, during the heating operation, and during the defrosting operation. This process is a process of the microcomputer 330 and is included in other processes of the heating operation control process. First, in step S51, the coil temperature Tc is set to 30 ° C.
When the temperature exceeds 30 ° C., the operation of the fan 91A of the indoor heat exchanger is started in step S52. next,
Other processing is performed, and in step S53, it is determined whether or not the coil temperature Tc is lower than 25 ° C. If the coil temperature Tc is not lower than 25 ° C, the process directly proceeds to another processing.
At 54, the operation of the fan 91A is stopped. Next, it is monitored in step S55 whether the coil temperature Tc exceeds 30 ° C.
If the temperature exceeds ° C, the operation of the fan 91A is started in step S56, and the process proceeds to another process.

FIG. 9 is a flowchart showing an example of the excessive heat prevention process (of the coil temperature Tc) of the indoor heat exchanger 9A during the heating operation. This process is a process of the microcomputer 330 and is included in other processes of the heating operation control process.
First, in step S61, it is determined whether or not the coil temperature Tc has exceeded 60 ° C. If the coil temperature Tc has not exceeded 60 ° C, the process proceeds directly to another process.
At 2, the compressor drive unit C9 (relay) is turned off, and the air conditioner is stopped. Next, in step S63, the process waits for a predetermined time, turns on the compressor drive unit C9, and after a predetermined time, turns off the compressor drive unit C9 and proceeds to step S64. In step S64, it is monitored whether the coil temperature Tc is lower than 50 ° C.
If the temperature is lower than 50 ° C., in step S65, the compressor drive unit C9 is turned on to start the operation of the air conditioner, and proceeds to another process.

(Second Embodiment) FIG. 10 is a principle block diagram of a refrigeration cycle of an air conditioner and a control device therefor according to a second embodiment of the present invention, and FIG. 11 is a block diagram of the air conditioner (and control device). It is an electric block diagram, and this 2nd embodiment is an embodiment of an air conditioner which performs reverse cycle defrosting operation. The refrigeration cycle A is the same as in the first embodiment. This air conditioner has an outdoor heat exchanger drive source 40 in addition to the configuration of the first embodiment (elements having the same reference numerals as in FIGS. 1 and 2).
1 is provided with an outdoor heat exchanger driving section C8 for controlling the driving of the motor 1 and an outdoor control section 400 '(FIG. 11). The outdoor heat exchanger driving unit C8 is a unit that functions by executing a control program described below.

As shown in FIG. 11, the outdoor controller 400 '
Is a microcomputer 470, a temperature sensor 403 for detecting the pipe temperature (coil temperature) Tc 'of the outdoor heat exchanger, a switch means C8' for controlling the outdoor heat exchanger drive source 401 (the outdoor fan motor 92B), and the compressor 4 A switch means C9 'for controlling the electric motor 450 to be driven is provided.

The control unit C shown in FIG. 1 of the first embodiment is used.
The control unit C1 in FIG. 10 of the first and second embodiments is denoted by the same reference numeral, but in the first embodiment of FIG.
The control unit C1 corresponds to the microcomputer 330 of the indoor control unit 300, and in the second embodiment of FIG.
Corresponds to the microcomputer 330 of the indoor control unit 300 of FIG. 11 and the microcomputer 470 of the outdoor control unit 400 'of FIG.

The second embodiment operates, for example, as follows. The indoor control unit 300 performs the same operation as that of the first embodiment. In addition to the operation of the indoor control unit 300, when the compressor driving unit C9 is turned on, the outdoor control unit 4 is simultaneously operated.
00 ′ is supplied with power, the microcomputer 470 functions, and executes processing by a predetermined program shown in the flowcharts of FIGS. Note that, in the second embodiment, the compressor 4 is not directly driven by the compressor driving unit C9 (driver, relay (coil), relay contact). Further, in the outdoor control unit 400 ', the microcomputer 470 turns on the switch means C8' and the switch means C9 'both in the cooling operation and in the heating operation, so that the electric motor 450 (compressor 4) and the outdoor fan motor 92B (4
01) to start the air-conditioning operation. Note that the microcomputer 470 stops the process when the compressor driving unit C9 is turned off (the supply of power to the outdoor control unit 400 'is stopped).

When the air-conditioning operation is started, in the case of the cooling operation, the microcomputer 470 of the outdoor control unit 400 ′ starts counting of the time counting means (timer), and the temperature sensor 403 detects the pipe temperature of the outdoor heat exchanger. Tc 'is detected, and when this pipe temperature Tc' exceeds a predetermined temperature (for example, 70 ° C.), it is determined that “overload” has occurred, and the switch means C9 ′ is turned off.

When the air-conditioning operation is started, in the case of the heating operation, the microcomputer 470 of the outdoor control section 400 ′ starts counting of the time counting means (timer), and the temperature sensor 403 detects the pipe temperature of the outdoor heat exchanger. Tc 'is detected. The time counting means counts the time longer than the defrost inhibition time,
The pipe temperature Tc 'is a predetermined temperature (for example, -5 ° C).
When the following time continues for, for example, 5 minutes, the reverse cycle defrosting operation is performed. The control process in that case is (defrosting start determination) → switch means C9′OFF → switch means C
8 'OFF → (approx. 1 minute standby) → switch means C9' ON
→ (Start of defrosting operation) → “Reverse cycle defrosting operation” → (Defrosting end determination) → Switch means C9 'OFF → (Approximately one minute standby) → Switch means C9' ON → Switch means C8'O
N → (Return to heating operation). The flow path switching valve 100 is controlled to switch between a heating mode, a cooling mode, and a heating mode.

In the second embodiment, since the outdoor control section 400 'also includes the microcomputer 470, it is possible for the outdoor control section to make the determination, and FIGS. 13 and 14 show examples of this. Further, in the second embodiment, since the indoor control unit 300 includes the microcomputer 330, the processes of FIGS. 3 to 9 are executed similarly to the first embodiment. However, the "overload protection" and the "defrost control" of the second embodiment can be executed only by the outdoor control unit 400 '.

In a commercial air conditioner or the like,
As shown in FIG. 12, an electric motor 45 for driving the compressor 4
A three-phase motor is used as 0 ". In this case, an electromagnetic contactor 450 'and the like are provided in place of the motor 450 in Fig. 11, so that both the compressor drive section C9 and the switch means C9' do not require a contact capacity. The effect that the configuration of the control device is inexpensive compared to the single-phase motor can be obtained.

FIG. 13 shows an indoor control unit 400 according to the second embodiment.
14 is a flowchart of the overload protection processing mainly during the cooling operation, and FIG. 14 is a flowchart relating to the defrosting operation during the heating. The microcomputer 470 starts power-on by turning on the compressor driving unit C9 (relay), and first performs an initial process in step S71 of FIG.
In step S72, the timer starts counting time. Next, in step S73, the coil temperature Tc '(1) at the time of starting is read, and
In step S74, the switch means C9 'is turned on to start the AC motor 450 (compressor 4). In step S75, the switch means C8' is turned on and the outdoor fan motor 92 is turned on.
Start B (401). Next, it is monitored in step S76 that a predetermined time has elapsed, and when the predetermined time has elapsed, the current coil temperature Tc '(2) is read in step S77, and the process proceeds to step S78.

In step S78, Tc '(1) <Tc'
It is determined whether or not (2). If Tc ′ (1) <Tc ′ (2), the current outdoor heat exchanger 9 (after a predetermined time from start-up)
Since the coil temperature Tc '(2) of B is higher than the coil temperature Tc' (1) at the time of starting, the air conditioner is in the cooling operation (the outdoor heat exchanger 9B is in the condenser state), and other processing is performed. If it is not Tc '(1) <Tc' (2), since the heating operation is being performed, the other processing in FIG. 14 is performed, and the processing proceeds to step S708.

In step S79, the coil temperature Tc '(3) is read at predetermined intervals, and in step S701, Tc'(3)>
It is determined whether the temperature is 70 ° C., and if Tc ′ (3)> 70 ° C., another process is performed and the process returns to step S79, where T
If c ′ (3)> 70 ° C., the switch C9 ′ is turned off in step S702 to stop the AC motor 450 (compressor 4). Next, in step S703, the coil temperature Tc '(3) is read every predetermined time, and in step S704, it is determined whether Tc' (3) <50 ° C., and Tc '(3) <
If it is not 50 ° C., the process returns to step S703. As described above, when the coil temperature Tc ′ (3) exceeds 70 ° C., the overload protection processing is performed in steps S701 to S704.

Then, in step S704, Tc '(3) <
If it is 50 ° C. (return to less than 50 ° C.), step S70
In 5 to S707, the mode returns to the cooling mode. That is, the main valve element 62 of the flow path switching valve 100 returns to the main valve element return position by turning off the switch means C9 'in step S702. Therefore, in step S705, the switch means C9 '
Is turned on to drive the compressor 4. As a result, the flow path switching valve 100 enters the heating mode, so that step S706 is performed.
After a predetermined time, the switch means C9 'is turned off. Further, at step S707, after a predetermined time, the switch means C9' is turned off.
By turning on 9 ', the flow path switching valve 100 is set to the cooling mode. Then, other processing is performed, and step S7 is performed.
Return to 9.

On the other hand, in step S708 of FIG. 14, the timer of the defrost prohibition timer is started, and in step S709, the coil temperature Tc '(3) is read every predetermined time, and in step S71.
At 0, the defrost prohibition timer determines whether 45 minutes have elapsed,
If the minutes have not elapsed, the process returns to step S709, and if the minutes have elapsed, the process proceeds to step S711. Next, according to steps S711 and S712, after the lapse of 45 minutes, the coil temperature Tc '(3) is continuously lowered to -5.degree.
Monitor for the following: Thereby, frost formation (defrosting start state) is detected. After 5 minutes, the coil temperature T
When c '(3) becomes equal to or lower than -5 ° C, it is assumed that frost formation has been detected, the switch means C9' is turned off in step S713 to stop the compressor 4, and the switch means C8 'is turned off in step S714. Outdoor fan motor 9
Stop 2B. Then, at step S715, after a predetermined time, the switch means C9 'is turned on to start the compressor 4, and the defrosting operation is started in the cooling mode. Next, in step S716, the defrost prohibition timer is cleared, and in step S71.
At 7, the defrosting operation timer is started.

Next, at step S718, the coil temperature Tc '(3) is read every predetermined time, and at step S719, Tc' (3) is read.
It is determined whether or not c ′ (3) ≧ 15 ° C., and Tc ′ (3) ≧ 1
If it is 5 ° C., it is determined that defrosting has been completed, and the flow advances to step S722. If Tc ′ (3) ≧ 15 ° C., step S720
Then, the defrosting operation timer determines whether 10 minutes have elapsed. 10
If it has not elapsed, the process returns to step S718. If 10 minutes have elapsed, the defrosting operation timer is cleared in step S721, and the mode returns to the heating mode in steps S722 to S724.

In step S722, the switch means C9 'is turned off to set the main valve body 62 to the main valve body return position. In step S723, after a predetermined time, the switch means C9' is turned on to set the flow path switching valve 100 to the heating mode. . Then, in step S724, the switch means C8 'is turned on to start the outdoor fan motor 92B, other processing is performed, and the flow returns to step S708.

(Third Embodiment) FIG. 15 is a principle block diagram of a refrigeration cycle of an air conditioner and a control device therefor according to a third embodiment of the present invention, and FIG. 16 is a block diagram of the air conditioner (and control device). It is an electric block diagram, and this 3rd embodiment is an embodiment of an air conditioner which performs hot gas bypass defrosting operation. Note that the refrigeration cycle A includes a hot gas bypass pipe and a hot gas bypass valve 600 in the configuration of the first embodiment. The configuration of the second embodiment (FIG. 1)
0, the hot gas bypass valve 6
Fluid control valve drive source (electromagnetic coil) 601 for driving 00
The drive of the fluid control valve drive source 601 is controlled by an outdoor heat exchanger drive unit C8.

As shown in FIG. 16, the outdoor control unit 4
Reference numeral 00 ′ includes switch means C8 for controlling the microcomputer 470 to switch the energization of the outdoor fan motor 92B (the outdoor heat exchanger drive source 401) and the electromagnetic coil 601 (the fluid control valve drive source). The electric motor 450 that drives the compressor 4 is a compressor driving unit C of the indoor control unit 300.
9 (relay).

FIG. 17 shows an outdoor control unit 40 according to the third embodiment.
FIG. 18 is a flowchart of a process mainly in the cooling operation of the microcomputer 470 of 0 ', and FIG. 18 is a flowchart of a process mainly in the heating operation. The microcomputer 330 of the indoor control unit 300
Executes the processing of FIGS. 3 to 9 similarly to the first embodiment.
The microcomputer 470 turns on the compressor drive unit C9 (relay).
As a result, power-on start is performed. First, an initial process is performed in step S81 in FIG. 17, and time counting by a timer is started in step S82. Next, in step S83, the coil temperature Tc '(1) at the time of starting is read, and in step S84, the switch means C8 is turned off to turn on the outdoor fan motor 92B (4).
01) is started. Next, in step S85, the elapse of a predetermined time is monitored.
At step 6, the current coil temperature Tc '(2) is read, and step S
Proceed to 87.

In step S87, Tc '(1) <Tc'
It is determined whether or not (2) is satisfied. If Tc '(1) <Tc' (2), the cooling operation is performed, so that other processing is performed and step S8 is performed.
Then, in step S88, the switch means C8 is turned off to make sure that the outdoor fan motor 92B is driven, other processing is performed, and the flow proceeds to step S88.
On the other hand, if Tc '(1) <Tc' (2), the heating operation is being performed, so that the other processing in FIG. 18 is performed, and the process proceeds to step S89.

In step S89 of FIG. 18, the timer of the defrosting prohibition timer is started, and in step S801, the switch means C8 is turned off to make sure that the outdoor fan motor 92 is pressed.
The driving state of B is maintained, and in step S802, the defrost inhibition timer determines whether 45 minutes have elapsed. If 45 minutes have not elapsed, the process returns to step S801, and if 45 minutes has elapsed, the process proceeds to step S803. Next, in steps S803 and S804, after the 45 minutes have elapsed, the coil temperature Tc '(3) is monitored to be kept at -5 ° C or lower for, for example, 5 minutes, and frost formation (defrosting start state) is monitored. To detect. And 5
If the coil temperature Tc '(3) drops below -5 ° C. after a lapse of one minute (frost detection), the switch means C8 is turned on in step S805 to stop the outdoor fan motor 92B and the electromagnetic coil of the hot gas bypass valve 600. 601 ON
And start the defrosting operation (hot gas bypass) in the heating mode. Then, the defrost prohibition timer is cleared in step S806, and the counting of the defrost operation timer is started in step S807.

Next, at step S808, the coil temperature Tc '(3) is read at predetermined time intervals, and at step S809, Tc' (3) is read.
It is determined whether or not c ′ (3) ≧ 10 ° C., and Tc ′ (3) ≧ 1
If it is 0 ° C., it is determined that defrosting has been completed, and the process proceeds to step S812. If Tc ′ (3) ≧ 10 ° C., the process proceeds to step S810.
Then, the defrosting operation timer determines whether 10 minutes have elapsed. 10
If the minutes have not elapsed, the process returns to step S808. If the minutes have elapsed, the defrosting operation timer is cleared in step S811 and the process proceeds to step S812.

In step S812, the switch means C8
Is turned off, the outdoor fan motor 92B is started, and the electromagnetic coil 601 of the hot gas bypass valve 600 is turned off to return to the heating mode. Then, another process is performed, and the process returns to step S89.

(Fourth Embodiment) FIG. 19 is a basic block diagram of a refrigeration cycle of an air conditioner and a control device therefor according to a fourth embodiment of the present invention, and FIG. 20 is a block diagram of the air conditioner (and control device). It is an electric block diagram, and this 4th embodiment is an embodiment of an air conditioner which performs reverse cycle defrosting operation like a 2nd embodiment. The refrigeration cycle A is the same as the first and second embodiments except for the expansion device 10A.
This air conditioner includes an aperture device drive unit (transistor array) C6 and an aperture device drive source (stepping motor) 404 in addition to the configuration of the second embodiment (elements having the same reference numerals as in FIG. 10). That is, the aperture device 10A
Is an electric expansion device (electric expansion valve) whose opening is controlled by a stepping motor 404, for example. In the following embodiment, the throttle device 10A is mainly referred to as the “motorized valve 10”.
A ".

Here, in the fourth embodiment (and a fifth embodiment to be described later), the flow rate of the refrigerant of the refrigeration cycle A is different between the time of cooling and the time of heating, and also differs depending on the capacity. For example, as shown in FIG.
As the capacity increases, such as W, 2.5 kW, 2.8 kW, and 3.2 kW, the flow rate increases, and even with the same capacity, the flow rate during cooling becomes greater than the flow rate during heating.

Therefore, as shown in FIG.
The opening degree of 0A, the opening degree Pc at the time of cooling and the opening degree Ph at the time of heating are determined by the capacity (2.2kW, 2.5kW, 2.8kW, 3.2k).
W). The average opening Pm at this time is (P
h + Pc) / 2. As shown in FIG. 20, a 2-bit jumper C2J is provided in the input section C2 of the microcomputer 470, and the microcomputer 470 is connected to the jumper C2J.
, The capacity of the air conditioner can be identified, for example, 2.2 kW, 2.5 kW, 2.8 kW, 3.2 kW
For example, four types of selection can be determined. Note that jumper C
2J is set according to the capacity of the air conditioner at the time of shipment or the like.

The fourth embodiment operates, for example, as follows. It should be noted that also in the fourth embodiment, the indoor control unit 30
0 to the microcomputer 330 shown in FIGS.
Execute the processing of At the same time when the compressor driving unit C9 is turned on, electric power is supplied to the outdoor control unit 400 ', and the outdoor control unit 4
The microcomputer 470 of 00 'operates. In the fourth embodiment, the compressor 4 is not directly driven by the compressor driving unit C9 as in the second embodiment. The microcomputer 470 reads the data of the jumper C2J, selects and determines (determines) the performance of the air conditioner, and detects the pipe temperature Tc 'of the outdoor heat exchanger 9B of the outdoor unit by the temperature sensor 4.
03 to determine whether the flow path mode is the heating mode or the cooling mode. Then, the opening of the electric valve 10A is set to the opening Ph for heating or the opening Pc for cooling. In addition,
The opening of the motor-operated valve 10A at the start of the outdoor unit is set to the average opening Pm of Ph and Pc.

FIG. 23 is a flowchart of the processing of the microcomputer 470 of the fourth embodiment. The microcomputer 470 starts power-on by turning on the compressor drive unit C9 (relay). First, the microcomputer 470 performs an initial process in step S91 of FIG. 23, and starts counting a timer in step S92. next,
In step S93, the motor-operated valve 10A is fully opened or closed to perform a reference position setting of the motor-operated valve 10A,
In step S94, the data of the jumper C2J is read, and the capability of the air conditioner is selected and determined. Next, in step S95, the opening of the motor-operated valve 10A is returned to the average opening Pm corresponding to the determined capacity, the coil temperature Tc '(1) at the time of starting is read in step S96, and the switching means is switched in step S97. C9 'is turned on to start the AC motor 450 (compressor 4).
8 'is turned on to start the outdoor fan motor 92B (401). Next, in step S99, the elapse of a predetermined time is monitored. When the predetermined time has elapsed, the current coil temperature Tc '(2) is read in step S901, and the flow proceeds to step S902.
Proceed to.

In step S902, Tc '(1) <T
It is determined whether or not c ′ (2). Tc '(1) <Tc'
If (2), the coil temperature Tc '(2) of the outdoor heat exchanger 9B at the present time (after a predetermined time from the start) is the coil temperature Tc at the start.
Since it is higher than c '(1), it is the cooling operation, and the other processing is performed, and the process proceeds to step S903, where Tc' (1) <T
If it is not c '(2), the operation is the heating operation, so that another process is performed and the process proceeds to step S905. In step S903, the opening of the electric valve 10A is set to the opening Pc during cooling. Then, in step S904, the same overload protection processing as in the second embodiment is performed, and other processing is performed, and step S90 is performed.
Return to 3.

On the other hand, in step S905, the electric valve 10
The opening degree of A is set to the opening degree Ph at the time of heating, and step S9
In step 06, it is determined whether or not defrosting is necessary. If not, another process is performed and the process returns to step S905. If necessary, a reverse cycle defrosting operation control process is performed in step S907 to perform another process. And returns to step S905.

(Fifth Embodiment) FIG. 24 is a principle block diagram of a refrigeration cycle of an air conditioner and a control device therefor according to a fifth embodiment of the present invention, and FIG. 25 is a block diagram of the air conditioner (and control device). It is an electric block diagram, and this 5th embodiment is an embodiment of an air conditioner which performs hot gas bypass defrosting operation like a 3rd embodiment. In addition to the configuration of the third embodiment shown in FIG. 16, a 2-bit jumper C2J
And the motor-operated valve 10A is provided with a transistor array C6 and a stepping motor 4
At 04, the opening is controlled. Also, in the fifth embodiment, the microcomputer 330 of the indoor control unit 300 executes the processing of FIGS. 3 to 9 as in the first embodiment.

FIG. 26 is a flowchart of the processing of the microcomputer 470 of the fifth embodiment. The microcomputer 470 starts power-on by turning on the compressor drive unit C9 (relay). First, the microcomputer 470 performs an initial process in step S111 in FIG. 26, and starts counting a timer in step S112. Next, in step S113, the motor-operated valve 10A is fully opened to set the reference position of the motor-operated valve 10A.
At 114, the data of the jumper C2J is read and the capability of the air conditioner is selected and determined. Next, step S11
In step 5, the opening of the motor-operated valve 10A is returned to the average opening Pm corresponding to the determined capacity, the coil temperature Tc '(1) at the start is read in step S116, and the switch C8 is turned off in step S117. And the outdoor fan motor 92B
Is started, and the electromagnetic coil 601 of the hot gas bypass valve 600 is turned off. Next, step S118
Monitoring the elapse of a predetermined time, and when the predetermined time elapses,
In step S119, the current coil temperature Tc '(2) is read, and the process proceeds to step S120.

In step S120, Tc '(1) <T
It is determined whether or not c ′ (2). Tc '(1) <Tc'
If (2), the operation is the cooling operation, other processes are performed, and the process proceeds to step S121. If Tc '(1) <Tc' (2), the process is the heating operation unless Tc '(1) <Tc' (2). move on. In step S121, the opening of the electric valve 10A is
The opening degree Pc at the time of cooling is set. Then, step S12
In step 2, the switch means C8 is turned off to make sure that the driving state of the outdoor fan motor 92B is maintained, other processing is performed, and the process returns to step S121.

On the other hand, in step S123, the electric valve 10
The opening of A is set to the opening Ph at the time of heating, and step S1
At 24, it is determined whether or not defrosting is necessary. If not, the process proceeds to step S127.
At 125, the switch means C8 is turned on to stop the outdoor fan motor 92B and the hot gas bypass valve 60
The 0 electromagnetic coil 601 is turned on. Then, in step S126, for example, steps S806 to S81 in FIG.
The hot gas bypass defrosting operation control processing is performed in the same manner as in step 1, and in step S127, the switch C8 is turned off.
F, the outdoor fan motor 92B is started, and the electromagnetic coil 601 of the hot gas bypass valve 600 is turned off.
To return to the heating mode. Then, another process is performed, and the process returns to step S123.

(Sixth Embodiment) FIG. 27 is an electric block diagram of an air conditioner (and a control device) according to a sixth embodiment. The sixth embodiment is an air conditioner that performs hot liquid defrost control. FIG. The principle block diagram is the same as FIG. Also in the sixth embodiment, the microcomputer 330 of the indoor control unit 300 executes the processing of FIGS. 3 to 9 as in the first embodiment.

FIG. 28 is a flowchart of the process of the microcomputer 470 of the sixth embodiment. The microcomputer 470 starts power-on by turning on the compressor drive unit C9 (relay). First, the microcomputer 470 performs an initial process in step S131 of FIG. 28, and starts counting a timer in step S132. Next, in step S133, steps S113 to S113 in FIG.
The same processing as in S115 is performed, that is, the reference position of the motor-operated valve 10A is determined, the data of the jumper C2J is read and the ability is selected, and the opening of the motor-operated valve 10A is set to the average opening Pm. Next, at step S134, the coil temperature T at the start
c '(1) is read, the switch means C8 is turned off in step S135, and the outdoor fan motor 92B is started. Next, in step S136, the elapse of a predetermined time is monitored. When the predetermined time elapses, the current coil temperature Tc '(2) is read in step S137, and the flow advances to step S138.

In step S138, Tc '(1) <T
It is determined whether or not c '(2), and Tc' (1) <Tc '(2)
If (cooling operation), other processing is performed and step S1 is performed.
If it is not Tc '(1) <Tc' (2) (heating operation), other processing is performed and the processing proceeds to step S141. In step S139, the opening of the electric valve 10A is set to the opening P during cooling.
Then, in step S140, the switch means C8 is turned off for the purpose of pressing down, the driving state of the outdoor fan motor 92B is maintained, another process is performed, and the process returns to step S139.

On the other hand, in step S141, the electric valve 10
The opening of A is set to the opening Ph at the time of heating, and step S14 is performed.
In step 2, it is determined whether or not defrosting is necessary. If not, the process proceeds to step S147.
At 43, the switch means C8 is turned on to stop the outdoor fan motor 92B. Then, in step S144, the opening of the electric valve 10A is fully opened, and in step S145, the hot liquid defrosting operation control process is performed. Then, Step S146
To set the opening of the motor-operated valve 10A to the heating opening Ph.
In step 147, the switch means C8 is turned off to start the outdoor fan motor 92B, and other processing is performed.
Return to 41.

As described above, although the defrosting ability is inferior to the reverse cycle type, the defrosting operation can be performed while performing the heating operation. Also, compared to hot gas bypass defrosting, there is no need for an electromagnetic valve and a piping member, which is advantageous in terms of cost.

[0096]

According to the air conditioner of the first aspect of the present invention, the cost is reduced and resources are saved as compared with the case where the number of control lines connecting between the indoor unit and the outdoor unit is three or more.

According to the air conditioner of the second aspect of the present invention,
Since the flow path switching valve is switched by non-motorized power, there is no need for an electric wire for driving and controlling the coil and the like of the flow path switching valve,
3 control lines connecting the indoor unit and the outdoor unit
Compared to the case of more than one book, it becomes cheaper and saves resources.

According to the control device for an air conditioner of the third aspect of the present invention, the flow path switching valve is switched by a non-motorized power, so that the air conditioner drives and controls the coil of the flow path switching valve. No electric wires are required, and the cost is reduced and resources are saved as compared with the case where three or more control lines connect between the indoor unit and the outdoor unit.

According to the control device for an air conditioner of the fourth aspect of the present invention, the same effect as that of the third aspect can be obtained.

According to the control device for an air conditioner of claim 5 of the present invention, the same effect as that of claim 3 can be obtained,
The outdoor control means detects an overload state of the outdoor heat exchanger in the cooling operation, and can cut off the power supply to the motor of the compressor and the fan motor of the outdoor heat exchanger without increasing the wiring. Energy saving.

According to the control device for an air conditioner of claim 6 of the present invention, the same effect as that of claim 3 can be obtained,
Since the opening of the expansion device can be controlled by the control means of the outdoor unit, the number of design steps can be significantly reduced by using an electric expansion device. In addition, by reducing the number of types of piping members, the number of design steps can be reduced, the cost can be reduced, and resources can be saved.

According to the control device for an air conditioner of claim 7 of the present invention, the same effect as that of claim 6 can be obtained,
The opening degree of the expansion device in the heating mode and the cooling mode can be suitably controlled by the control means of the outdoor unit.

According to the control device for an air conditioner of claim 8 of the present invention, the same effect as that of claim 6 can be obtained,
The control unit of the outdoor unit controls the opening degree of the expansion device to be a third predetermined opening degree obtained by averaging the opening degree of the first predetermined opening degree in the heating mode and the second predetermined opening degree in the cooling mode. Therefore, the degree of opening of the throttle device can be controlled according to the capacity of the air conditioner, and compared with the case of using many types of capillaries to meet the required capacity, it can be covered by one type of electric throttle device, Piping members can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of a control device for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an electric block diagram of the air conditioner according to the first embodiment of the present invention.

FIG. 3 is a flowchart of processing of a microcomputer of an indoor control unit common to the first to sixth embodiments of the present invention.

FIG. 4 is a flowchart of processing (control processing) by a microcomputer of the indoor control unit.

FIG. 5 is a flowchart of a process (schematic) of a microcomputer of the indoor control unit.

FIG. 6 shows a cooling operation control process of a microcomputer of the indoor control unit,
It is a figure which shows the example of the pattern of operation / stop in heating operation control processing and dehumidification operation control processing.

FIG. 7 is a flowchart of processing (freezing prevention processing) of a microcomputer of an indoor control unit common to the first to sixth embodiments of the present invention.

FIG. 8 is a flowchart of a process (cold air prevention process) by a microcomputer of the indoor control unit.

FIG. 9 is a flowchart of processing (excessive rise prevention processing) by a microcomputer of the indoor control unit.

FIG. 10 is a principle block diagram of a control device for an air conditioner according to a second embodiment of the present invention.

FIG. 11 is an electric block diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 12 is a circuit diagram of a control circuit example of a three-phase motor according to a second embodiment of the present invention.

FIG. 13 is a flowchart of a process at the time of cooling of a microcomputer of the outdoor control unit according to the second embodiment of the present invention.

FIG. 14 is a flowchart of a process at the time of heating of a microcomputer of the outdoor control unit according to the second embodiment of the present invention.

FIG. 15 is a principle block diagram of a control device for an air conditioner according to a third embodiment of the present invention.

FIG. 16 is an electric block diagram of an air conditioner according to a third embodiment of the present invention.

FIG. 17 is a flowchart of a process at the time of cooling of the microcomputer of the outdoor control unit according to the third embodiment of the present invention.

FIG. 18 is a flowchart of a process at the time of heating of the microcomputer of the outdoor control unit according to the third embodiment of the present invention.

FIG. 19 is a principle block diagram of a control device for an air conditioner according to a fourth embodiment of the present invention.

FIG. 20 is an electric block diagram of an air conditioner according to a fourth embodiment of the present invention.

FIG. 21 is a conceptual diagram of a flow rate during heating and a flow rate during cooling according to each capacity in the fifth embodiment of the present invention.

FIG. 22 is an explanatory diagram of the degree of opening versus flow rate characteristics when one type of electric expansion valve of the present invention is used.

FIG. 23 is a flowchart of a process of the microcomputer of the outdoor control unit according to the fourth embodiment of the present invention.

FIG. 24 is a principle block diagram of a control device for an air conditioner according to a fifth embodiment of the present invention.

FIG. 25 is an electric block diagram of an air conditioner according to a fifth embodiment of the present invention.

FIG. 26 is a flowchart of a process of the microcomputer of the outdoor control unit according to the fifth embodiment of the present invention.

FIG. 27 is an electric block diagram of an air conditioner according to a sixth embodiment of the present invention.

FIG. 28 is a flowchart of a process of the microcomputer of the outdoor control unit according to the sixth embodiment of the present invention.

FIG. 29 is a cross-sectional view of the passage switching valve according to the embodiment of the present invention when the compressor is stopped.

FIG. 30 is a cross-sectional view of the passage switching valve according to the embodiment of the present invention when the compressor is operating.

FIG. 31 is an operation characteristic diagram of the flow path switching valve according to the embodiment of the present invention.

FIG. 32 is a basic block diagram of a conventional technique.

FIG. 33 is an electric block diagram of a conventional technique.

FIG. 34 is a diagram showing a first example of a conventional diaphragm device.

FIG. 35 is a diagram showing a second example of the conventional diaphragm device.

FIG. 36 is a substantial view of a second example of the conventional diaphragm device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 flow switching valve 300 indoor control unit 400 outdoor control unit 220 common power supply line 221 compressor control line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Sato 535 Sasai, Sayama-shi, Saitama Prefecture Sagimiya Manufacturing Co., Ltd. (72) Inventor Seiichi Nakahara 535 Sasai, Sayama-shi, Saitama F-term (reference) 3L092 AA14 BA23 BA26 DA08 DA19 EA20 FA22 FA26

Claims (8)

[Claims] 1. An air conditioner having a heat pump type refrigeration cycle in which a flow path of a fluid is separated into an indoor unit and an outdoor unit, wherein a control line connecting the indoor unit and the outdoor unit has two lines. An air conditioner characterized by being a book. 2. An air conditioner having a heat pump type refrigeration cycle in which a flow path of a fluid is separated into an indoor unit and an outdoor unit, wherein a non-electric power generated by controlling a physical quantity of the fluid is generated. An air conditioner, comprising: a flow path switching valve for switching a flow path of the fluid, wherein two control lines are connected between the indoor unit and the outdoor unit. 3. A flow path switching valve for an air conditioner, comprising: a flow path switching valve that switches a flow path mode of the fluid by using a non-electric power generated by controlling a physical quantity of the fluid. A control device for an air conditioner for controlling an air conditioner, wherein a control line connecting between an indoor unit and an outdoor unit of the air conditioner is composed of two lines. apparatus. 4. A flow path switching valve for an air conditioner, comprising: a flow path switching valve that switches a flow path mode of the fluid by using a non-electric power generated by controlling a physical quantity of the fluid. In a control device for an air conditioner that controls an air conditioner, a control line connecting between an indoor unit and an outdoor unit of the air conditioner is configured by a common power supply line and a compressor control line. Characteristic air conditioner control device. 5. A flow path switching valve that is controlled to be switched by a predetermined operation of a compressor of an air conditioner, wherein the flow path mode is changed from a cooling mode to a heating mode or a heating mode by one predetermined operation of the compressor. An air conditioner control device for controlling an air conditioner having a flow path switching valve for switching from a mode to a cooling mode, wherein a control line connecting an indoor unit and an outdoor unit of the air conditioner includes a common power supply line. And a compressor control line, and the outdoor unit includes outdoor control means. 6. An air conditioner provided with a coilless four-way valve, wherein an indoor unit and an outdoor unit are connected by two electric wires, and a control unit of the outdoor unit controls an opening degree of the expansion device. A control device for an air conditioner, comprising: 7. An air conditioner having a coilless four-way valve, wherein an indoor unit and an outdoor unit are connected by two electric wires, and a control unit of the outdoor unit controls a degree of opening of the expansion device. The control device for an air conditioner, further comprising: determining a flow path mode of the refrigerant, setting the first predetermined opening in the heating mode, and setting the second predetermined opening in the cooling mode. 8. An air conditioner including a coilless four-way valve, wherein the indoor unit and the outdoor unit are connected by two electric wires, and a control unit of the outdoor unit includes a step of controlling an opening degree of the expansion device. Further, at the start of the operation of the outdoor unit, the opening of the expansion device is set to a third predetermined opening obtained by averaging the opening of the first predetermined opening in the heating mode and the second predetermined opening in the cooling mode. A control device for an air conditioner, comprising: