JPH07117279B2 - Air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a hot water circuit for heating operation, a refrigerant circuit for cooling operation, and a hot water circuit and a refrigerant circuit for dehumidifying operation. It relates to the sequential activation of each device when installed in a general home.

[0002]

2. Description of the Related Art As a conventional air conditioner, Jikho Sho 56
As described in JP-A-12532, there is shown one using a refrigerant circuit using a compressor and a hot water circuit using a burner. Heating operation is performed using the hot water circuit, and cooling operation is performed using the refrigerant circuit. What was done using was described.

[0003]

In such an air conditioner according to the prior art, hot water controlled to a constant temperature by a burner is circulated in a heat exchanger of an indoor unit by a pump, especially during heating operation. The conditioned air heated by this heat exchanger was supplied to the room using a blower, but this air conditioner stops the burner operation when the room temperature reaches the set value during heating operation. It was something that made me do it.
Further, the thus-configured one can perform the dehumidifying operation by simultaneously operating the hot water circuit and the refrigerant circuit.

In a general household, the maximum current capacity of each indoor wiring is 30 A, and the instantaneous current capacity (the maximum value of the starting current of the compressor etc.) is regulated to 45 A or less (the breaker operation is 20 A). Is set).

When an air conditioner as shown in the related art is connected to this indoor wiring, it is the air conditioner that all the devices constituting the air conditioner such as the compressor and the heat source device are connected to the same indoor wiring. It was common due to the simplification of installation work and wiring work.

In such a case, when the operation of the air conditioner is started from the dehumidifying operation, the devices such as the compressor, the air blower, the heat source device, the pump, etc. start to be started at the same time, and the sum of the starting currents flowing through the indoor wiring (for example, The starting current of the compressor is 38A,
The starting current of the pump is 7A, the starting current of the burner fan of the heat source unit is 3A, the starting current of the blowers (2 units) is 8A, etc.) exceeds the maximum value of 45A, and the indoor wiring is heated, causing a fire. I was afraid to wake up. In particular, when it takes a long time to start the compressor due to the influence of the pressure balance of the refrigerant circuit and the temperature of the outside air, the starting current flows for a long time, which further increases the danger. In addition, the breaker may be activated each time the dehumidifying operation is started.

Therefore, whether the power source of the air conditioner is set to 200V, the wiring work using a plurality of indoor wirings is performed, or the capacity of the compressor or the heat source device is reduced to reduce the maximum current at the time of startup, Furthermore, measures such as not performing the dehumidifying operation were considered, but all of them had problems in terms of construction and capacity for general household use.

In order to solve the above problems, the present invention provides an air conditioner which can suppress the starting current flowing through the indoor wiring to a low level even when the air conditioner is being dehumidified.

[0009]

According to the present invention, a refrigerant circuit in which a compressor, a condenser, a decompression device, and an evaporator are sequentially connected by a refrigerant pipe, and a heat source device, a pump, and a heat exchanger are sequentially annularly by a hot water pipe. It has a connected hot water circuit, and during the cooling operation, conditioned air cooled by the evaporator of the refrigerant circuit is supplied to the room using the blower, and during the heating operation, it was heated by the heat exchanger of the hot water circuit. Conditioned air is supplied indoors using a blower, and during dehumidification operation, the conditioned air cooled by the evaporator in the refrigerant circuit is reheated by the heat exchanger in the hot water circuit and then supplied indoors by the blower. In the created air conditioner, connect the compressor, blower, heat source, pump, etc. to the same power source,
When the operation of the air conditioner is started from the dehumidifying operation, the controller is first provided to start the compressor and then, after a predetermined time, start the blower, the heat source device, and the pump.

[0010]

In the air conditioner of the present invention configured as described above, when starting the dehumidifying operation for simultaneously operating the refrigerant circuit and the hot water circuit, the compressor, the heat source device, the blower, and the pump are sequentially activated. The maximum value of the starting current flowing through the indoor wiring can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioner according to the present invention, in which 1 is a compressor, 2 is a condenser, 3 is a decompression device, and 4 is an evaporator, and these devices are annularly connected by a refrigerant pipe. And constitutes a refrigerant circuit. Air blowers 6 and 7 respectively blow air to the condenser 2 and the evaporator 4. This refrigerant circuit radiates the heat absorbed by the evaporator from the condenser by operating the compressor. That is, the blower 6,
By operating No. 7, the air supplied to the room can be cooled by the evaporator.

A heat exchanger 8 is connected to hot water supply pipes 10 and 11 via control valves 12 and 13. The hot water supply pipes 10 and 11 are connected to the heat source device 9 and hot water is constantly circulated. Therefore, when the control valves 12 and 13 are opened, the pump 14 is operated to cause the hot water heated by the heat source device 9 to circulate through the hot water supply pipes 10 and 11 through the heat exchanger 3 in the direction of the solid line arrow. That is, a hot water circuit is formed.

The control valves 12 and 13 are flow rate variable valves whose opening can be changed, and the amount of hot water flowing through the hot water circuit, that is, the heat exchanger 8 can be changed by changing the opening. The opening degree of the control valves 12 and 13 can be changed in 31 steps from fully closed to fully opened according to the control signal. This opening degree changes in one step every time the control signal is given once (1 step). Further, the opening degree of the control valve is usually changed every predetermined time (for example, every 4 minutes).

As such a control valve, it is preferable to use a step motor. By using the step motor, the valve opening and the step (step) coincide with each other, so that the valve opening can be accurately set without obtaining feedback from the control valve. Further, in the step motor, since the torque for changing the opening degree from each stage is constant, the opening degree can be accurately changed especially when the control valve is fully closed. If you try to control the opening of the valve by the current supplied to the exciting coil without using the step motor, the current flow may be small near the fully closed position and the valve opening / closing torque may be less than the circulating pressure of hot water. In some cases, the valve opening could not be changed.

Reference numeral 15 denotes a controller, which controls the output of control signals to the control valves 12 and 13 and the operation of the compressor 1, the blowers 6 and 7, the heat source unit 9 and the pump 14. The control of these devices is controlled based on the room temperature TR detected by the temperature sensor 20 and the set value set by the setter 16.

Therefore, when the cooling operation is performed, the compressor 1 and the blowers 6 and 7 are operated, and when the control valves 12 and 13 are closed, the conditioned air cooled by the evaporator 4 is supplied into the room to perform the cooling operation. It can be carried out. When performing the heating operation, the heat source unit 9, the pump 14, the blower 7 are operated, and the control valves 12, 1
By opening 3, the conditioned air heated by the heat exchanger can be supplied to the room for heating operation. At this time, the compressor 1 and the blower 6 are stopped.

When performing the dehumidifying operation, if the heating operation and the cooling operation are simultaneously performed, the conditioned air cooled by the evaporator 4 is reheated by the heat exchanger 7.
The conditioned air supplied by the blower 7 has the same temperature as room temperature, and is cooled by the evaporator 4 once to condense and remove water, so that the air is dehumidified.

The controller 15 controls the above cooling operation, heating operation,
In addition to the dehumidifying operation, the following control is performed.

During the dehumidifying operation, the amount of air blown by the air blower 7 is controlled to be almost weak.

The opening / closing range of the control valves 12 and 13 during the dehumidifying operation is regulated to be equal to or less than the opening obtained by the heat exchanger 8 for canceling the cooling capacity of the evaporator 4 while operating the compressor 1. .

When the operation mode of the air conditioner is switched from the heating operation to the dehumidifying operation due to the change in the room temperature TR, when the compressor 1 starts the operation, the control valves 12 and 13 are opened by a certain step (for example, 10 steps) ( Control valve 12,
The control signal is output 10 times in the direction of opening 13. ).

When the operation mode of the air conditioner is switched from the cooling operation to the dehumidifying operation due to the change in the room temperature TR, the control valves 12 and 13 are opened at certain steps (for example, 5 steps) when the heat source device 9 starts to operate ( Control valves 12, 1
The control signal is output 5 times in the direction of opening 3. ).

When the operation mode at the start of the operation of the air conditioner is the dehumidifying operation, first the compressor 1 is started up for a predetermined time (the time when the start-up of the compressor 1 ends, for example, about 10 seconds).
After that, the heat source device 9, the pump 14, and the blowers 6 and 7 are activated.

FIG. 2 shows that the indoor unit (mainly containing the evaporator 4, the blower 7, the heat exchanger 8, and the control valves 12 and 13) 17 of the air conditioner shown in FIG. FIG. 3 is a schematic cross-sectional view showing a closed state. In this figure, 19 is a single radiator, and a tube for the evaporator 4 and a tube for the heat exchanger 8 are inserted into the same heat radiating plate to be integrally formed.

Therefore, an evaporator portion (evaporator 4) is formed on the windward side of the heat dissipation portion 19, and a heat exchanger portion (heat exchanger 8) is formed on the leeward side.

The temperature sensor 20 is attached to the primary side of the radiator 19 so as to detect the room temperature TR. 2
Reference numeral 1 is a temperature sensor mounted so as to detect the temperature of the secondary side of the radiator 19.

Reference numeral 22 denotes a room air intake port, and 23
Is an air filter, and 24 is a flap for changing the direction of the conditioned air that blows out the conditioned air.
6 is provided.

FIG. 3 is a flow chart showing the main operation of the controller 15. In this flowchart, it is first determined in step S0 and step S1 whether the room temperature TR satisfies the relationship of TS-1> TR, the relationship of TS + 2≤TR, or the relationship of TS + 2> TR≥TS-1. To do. When the relationship of TS + 2≤TR is satisfied, the cooling operation is performed, when the relationship of TS-1> TR is satisfied, the heating operation is performed, and when the relationship of TS + 2> TR≥TS-1 is satisfied, the dehumidifying operation is performed. .

When the condition of step S1 is satisfied, the operation proceeds to step S3 and the cooling operation is performed. That is, the compressor 1 and the blowers 6 and 7 are operated, and the control valves 12 and 13 are fully closed. At this time, the amount of air blown by the blower 7 is arbitrarily set according to the preference of the user. This cooling operation is performed in step S4 until TS = TR (the room temperature becomes equal to the set value). The heat source unit 9 and the pump 14 are stopped.

When TS = TR is determined in step S4,
After step S5, the dehumidifying operation of steps S6 to S9 is started. In step S5, the control signal is sent five times to the control valves 12 and 13 that were closed during the cooling operation, and the control valve 1
2 and 13 are forcibly opened from fully closed to 5 stages (valve opening degree correction means).

In the dehumidifying operation, first, in step S6, the compressor 1,
The heat source unit 9 is operated and the air blowers 7 and 8 are operated, and the air flow rate of the air blower 7 is set to a weak air flow rate. This time,
When none of the compressor 1, the heat source device 9, the blowers 7, 8 and the pump 14 is in operation, the flow chart of FIG.
The sequential startup shown in G. When the dehumidifying operation is started, it is first determined in step S41 whether or not the compressor 1 is operating (whether or not the cooling operation is being performed), and then step S41.
When the condition of is satisfied, the process proceeds to step S42. In step S42, the heat source unit 9 and the pump 14 are activated to start the dehumidifying operation. After that, the process proceeds to step S6 shown in FIG. 3 to continue the dehumidifying operation.

When the condition of step S41 is not satisfied, it is determined in step S43 whether the heat source unit 9 is operating (whether the heating operation is performed). Step S4
When the condition of 3 is satisfied, the process proceeds to step S44. In step S44, the compressor 1 and the sending devices 7 and 8 are activated to start the dehumidifying operation. After this, step S6 shown in FIG.
Proceed to and continue the dehumidification operation.

When neither of the conditions of step S41 and step S43 is satisfied (when the air conditioner is stopped), the process proceeds to step S45. In step S45, the compressor 1 is first started, and in step S46, a predetermined time (a time when the start of the compressor 1 ends, for example, about 10 seconds) is measured. After this timing is completed, the heat source unit 9 and the pump 1
4. Activate the blowers 6 and 7. After that, the process proceeds to step S6 shown in FIG. 3 to continue the dehumidifying operation.

As described above, when the start-up of the compressor 1 is completed and the start-up current of the compressor 1 disappears and the compressor 1 is operating normally with the operating current, the heat source device 9, the pump 14 and the blower 7 , 8 and the starting current of these devices flows, the current flowing through the indoor wiring does not exceed 45A.
For example, a compressor 1 with an output of 650 W having an operating current of 7 A and a starting current of 38 A, an operating current of 1 A, and a starting current of 7 A
Pump 14, operating current of 0.6 A, heat source unit 9 equipped with a burner fan of starting current of 3 A, operating current of 0.5
A, blower 7 with starting current 4A, operating current 0.6
A, when the blower device 8 having a starting current of 4A is used, a current of 38A flows when the compressor 1 is started, but the remaining devices are simultaneously started when the operating current (7A) is flowing to the compressor 1. However, the maximum current at startup is 25A (= 7A + 7A +
3A + 4A + 4A), which does not exceed the maximum current capacity of indoor wiring.

Next, in the flow chart of FIG. 3, in step S7, a control signal is sent from the room temperature TR and the set value TS to the control signal 1
It is determined whether or not to output to 2 and 13. For example, whether or not to output the control signal is determined as follows: "When TS> TR, the control valve 12,
A control signal for opening 13 is output, a control signal for closing control valves 12 and 13 is output when TS <TR, and a control signal is not output when TS = TR. Control. still,
This step S7 is performed every 4 minutes.

Next, in steps S8 and S9, the openings (number of steps) of the control valves 12 and 13 are regulated so as not to exceed 20 steps. These 20 stages are openings at which the cooling capacity by the evaporator and the heating capacity by the heat exchanger are almost balanced.

As described above, when the operation mode of the air conditioner is changed from the cooling operation to the dehumidifying operation, the control valves 12 and 13 are opened in five stages without waiting for a cycle of 4 minutes, so that the dehumidifying operation is performed. The temperature of conditioned air can be quickly brought close to room temperature. That is, since the opening degrees of the control valves 12 and 13 can be changed based on the change of the room temperature, the opening degrees of the control valves 12 and 13 do not change until the room temperature decreases even if the dehumidifying operation is started. Further, since the opening degrees of the control valves 12 and 13 are set every 4 minutes in consideration of the lifespan of the control valves 12 and 13, the control valve 12 and 4 are set for 4 minutes after the dehumidifying operation is started.
The opening of 13 does not change. If the openings of the control valves 12 and 13 do not increase, the cooling capacity of the refrigerant circuit and the heating capacity of the hot water circuit are not balanced, and cold air is supplied to the room for a while despite the dehumidifying operation. Therefore, in the present invention, step S5 is provided to forcibly open the control valves 12 and 13 for 5 steps, and the cool air feeling of the discharge air after the operation of the air conditioner is changed from the cooling operation to the dehumidifying operation. Is to prevent.

Further, in the dehumidifying operation, the amount of air blown by the air blower 7 is set to be weak, so that the time taken for the air sucked from the room to pass through the evaporator can be lengthened and the temperature of this air can be sufficiently reduced. be able to. That is, the moisture in the air can be sufficiently condensed, and the dehumidifying ability is improved.

Such dehumidifying operation is performed while it is determined in step S1 and step S2 that the room temperature TR is in the range of TS + 2> TR ≧ 15. That is, if the condition of step S1 is satisfied during the dehumidifying operation, the cooling operation is restarted,
If the condition of step S2 is satisfied during the dehumidifying operation, the heating operation is restarted.

When the condition of step S0 is satisfied, the operation proceeds to step S10 and the heating operation is performed. That is, the compressor 1 and the air blower 6 are stopped, the pump 14, the heat source device 9, and the air blower 7 are operated, and the control valves 12 and 13 are opened. At this time, the amount of air blown by the blower 7 is arbitrarily set according to the preference of the user. In step S11, the same determination as in step S7 described above is performed and a control signal for controlling the control valves 12 and 13 is output. This heating operation is performed in step S12 until TS = TR (room temperature becomes equal to the set value).

When TS = TR is determined in step S12, step S13 is followed by step S6 as described above.
~ The dehumidifying operation of step S9 is started. Step S1
In 3, the control signal is sent 10 times to the control valves 12 and 13 controlled by the heating operation, and the control valves 12 and 13 are opened 10 steps from the current opening.

As described above, when the operation mode of the air conditioner is changed from the heating operation to the dehumidifying operation, the control valves 12 and 13 are opened in 10 steps without waiting for a period of 4 minutes. The temperature of conditioned air can be quickly brought close to room temperature. That is, when the heating operation is changed to the dehumidifying operation, the room temperature is almost the set value, so that the opening degrees of the control valves 12 and 13 are almost 0 (closed). If the dehumidifying operation is started in this state, cold air will be discharged into the room as in the case of changing from the cooling operation to the dehumidifying operation. However, in the present invention, step S13 is provided to forcibly control the control valves 12 and 13. By opening 10 steps, the feeling of cool air of the discharged air after the operation of the air conditioner is changed from the heating operation to the dehumidifying operation is prevented.

The time when the operation of the air conditioner changes from the heating operation to the dehumidifying operation is the beginning of spring or the rainy season, and it is extremely uncomfortable for the user to blow cold air during the dehumidifying operation. Is. Therefore, in step S13 of the present invention, the opening degree at which the control valves 12 and 13 are forcibly opened is made larger than when the operation of the air conditioner is changed from the cooling operation to the dehumidifying operation to start the warming dehumidifying operation. Is set.

FIG. 4 is an explanatory diagram showing a change when the air conditioner starts the cooling operation, that is, when the operation is started from the condition satisfying the condition of step S1. In this figure, first, the cooling operation is performed until TR = TS. During this cooling operation, the control valves 12 and 13 are in a fully closed state. Next, when the dehumidifying operation (dry operation) is started, first, the control valve 1
2 and 13 are forcibly opened in five stages, the operation of the heat source device 9 is started, and the blower device 7 is operated with a weak wind. Thereafter, the opening degree of the control valves 12 and 13 is changed every 4 minutes based on the room temperature and the set value. This dehumidifying operation is continued until the room temperature drops and TR <15. When the room temperature reaches TR <15, heating operation is started. Next, when the room temperature becomes TR = TS, the dehumidifying operation is restarted, and when the room temperature becomes TS + 2≤TR, the cooling operation is restarted.

FIG. 5 is an explanatory diagram showing a change when the air conditioner starts the heating operation, that is, when the operation is started from the state satisfying the condition of step S0. In this figure, first, the heating operation is performed until TR = TS. In this heating operation, the heat source unit 9 and the pump 14 are operated, and the opening degrees of the control valves 12 and 13 are changed every 4 minutes based on the room temperature and the set value. Next, when the dehumidifying operation is started, the control valves 12 and 13 are forcibly opened from the 10-step current valve opening degree, the operation of the refrigerant circuit is started, and the blower 7 is operated with a weak wind. Thereafter, the opening degree of the control valves 12 and 13 is changed every 4 minutes based on the room temperature and the set value. This dehumidifying operation is continued until the room temperature drops and TS + 2≤TR. When the room temperature becomes TS + 2≤TR, the cooling operation is started. Next, when the room temperature becomes TR = TS, the dehumidifying operation is restarted, and when the room temperature becomes TR <15, the cooling operation is restarted.

[0046]

The air conditioner configured as described above has a hot water circuit for heating operation and a refrigerant circuit for cooling operation, and the dehumidifying operation is performed by operating the hot water circuit and the refrigerant circuit at the same time. In addition, after starting the compressor with the maximum starting current in the controller, other devices such as the heat source device, pump, and blower are started after a predetermined time has passed. Even if it is connected to, it is possible to prevent the starting current flowing when the device is started from exceeding the current capacity of the indoor wiring.

Therefore, it is possible to prevent the ignition due to the heating of the indoor wiring and the voltage drop due to the increase of the starting current.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of an air conditioner according to the present invention.

FIG. 2 is a schematic cross-sectional view of a state where the indoor unit of the air conditioner shown in FIG. 1 is attached to a wall.

FIG. 3 is a flowchart showing main operations of the air conditioner of the present invention.

FIG. 4 is a flowchart showing the starting order of equipment when the dehumidifying operation of the air conditioner of the present invention is started.

FIG. 5 is an explanatory diagram showing a relationship between an indoor temperature and a control valve when starting from a cooling operation.

FIG. 6 is an explanatory diagram showing a relationship between an indoor temperature and a control valve when the heating operation is started.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Pressure reducing device 4 Evaporator 5 Refrigerant pipe 7 Blower 8 Heat exchanger 9 Heat source device 10 Hot water supply pipe 11 Hot water supply pipe 12 Control valve 13 Control valve 14 Pump 15 Controller

Continuation of the front page (56) Reference JP-A-57-65533 (JP, A) JP-A-55-20385 (JP, A) Actually opened 63-92143 (JP, U) Actually opened 56-92028 (JP , U)

Claims (1)

[Claims] 1. A refrigerant circuit in which a compressor, a condenser, a pressure reducing device, and an evaporator are sequentially connected in an annular shape by a refrigerant pipe, and a hot water circuit in which a heat source device, a pump, and a heat exchanger are sequentially connected in an annular shape by a hot water pipe. During the cooling operation, the conditioned air cooled by the evaporator of the refrigerant circuit is supplied to the room using the air blower, and during the heating operation, the conditioned air heated by the heat exchanger of the hot water circuit is used by the air blower. In an air conditioner configured to supply indoors by a blower after reheating the conditioned air cooled by the evaporator of the refrigerant circuit in the heat exchanger of the hot water circuit during dehumidifying operation, A compressor, a blower, a heat source, a pump, etc. are connected to the same power source, and when the operation of the air conditioner is started from the dehumidifying operation, first the compressor is started, and after a predetermined time, the blower, the heat source, Specially equipped with a controller to start the pump Control device for an air conditioner to.