JPS5947221B2 - Air conditioner control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for an air conditioner equipped with a refrigeration cycle that uses a power cycle as a drive source for a compressor.

Conventionally, there have been refrigeration cycle compressor drive sources equipped with a Rankine cycle expander and an electric motor, but there has been no system that automatically controls these drive sources to provide comfortable air conditioning.

The present invention solves the above-mentioned drawbacks and provides an air conditioner control device that realizes comfortable air conditioning.

The present invention will be explained below with reference to the drawings showing one embodiment thereof.

In FIG. 1, reference numeral 1 denotes a power cycle, which is composed of an expander 2, a condenser 3, a refrigerant pump 4, a refrigerant vapor generator 5, and a control valve 6.

Further, the refrigerant steam generator 5 is heated by a heat source supplied from the solar collector 7 through a pipe 8.

9 is an output shaft of the expander 2, and an electric motor 11 and a compressor 12 are directly connected via an electric clamper 10.

The compressor 12 is a component of the refrigeration cycle 13, and is also composed of a condenser 14, a pressure reducing device 15, an evaporator 16, and the like.

Note that 1γ and 18 are blowers for the condenser 14 and the evaporator 16.

A pressure detector 19 detects the refrigerant pressure upstream of the control valve 6.

20 is an indoor thermostat for the air-conditioned room installed on the windward side of the evaporator 16.

Next, in FIG. 2, 21 is a power supply, an operation switch 22, a contact 23 of the indoor thermostat 20, a contact 2 of the pressure detector.
4 and relay coil 25 are connected in series, and contact 2
4 and the relay coil 25 in a series circuit, the relay coil 25
A series circuit consisting of the normally open contact 26 and the coil 27 of the electric clamp 10, a series circuit of the normally open contact 28 and the motor coil 29 of the pump 4, and a series circuit of the normally open contact 30 and the coil 31 of the control valve 6. Like the circuit, a series circuit of a normally closed contact 32 and a coil 33 of the motor 11 are connected in parallel.

Note that the control circuits for the blowers 17 and 18 are omitted.

With the above configuration, the present invention will now be described in detail.

First, a case will be described in which cooling is performed when sufficient energy is available from the solar collector 7.

In this case, the capacity of the refrigerant vapor generator 5 is large and the pressure detector 19 detects a sufficient amount of refrigerant n, and the contact 24 is closed, and the room temperature is high, so the contact 23 of the indoor thermostat 20 is also closed. ing.

At this time, when the operation switch 22 is turned on, the relay coil 2
5 is energized, the normally open contacts 26, 28, 30 are closed, and the coil 2γ, motor coil 29, and coil 31 are energized, thereby connecting the electric clamper 10 and opening the control valve 6. Refrigerant pump 4 is driven.

Therefore, the high pressure generated in the refrigerant vapor generator 5.

The high-temperature refrigerant vapor passes through the control valve 6, enters the expander 2, rotates the output shaft 9, reduces its pressure, enters the condenser 3, liquefies, and is sent to the refrigerant evaporator 5 again by the refrigerant pump 4. sent to.

On the other hand, the rotating output shaft 9 is sent to an evaporator 16 via an electric clamper 10, a compressor 14, a pressure reducer 15,
Returning to the compressor 12 again.

In this case, the coil 33 is not energized and the motor 11 is not excited. At this time, the air conditioned room is cooled by the blower 18.

Furthermore, when the room temperature falls below the setting, the contact 23 of the room temperature thermostat 20 is opened, the refrigerant pump 4 is stopped, the control valve 6 is closed, and the electric clamper 10 is disconnected, so the compressor 12 is stopped. The air conditioner will be temporarily stopped.

Next, consider a case where the solar collector 7 is no longer able to obtain sufficient energy when the room temperature is higher than the set value and the expander 2 is used as the drive source for the compressor 12 to cool the room.

In this case, since the inlet pressure of the expander 2 drops, the contact 24 of the pressure detector 19 is opened, the coil 33 is energized, the compressor is driven by the electric motor 11, and cooling continues.

Note that at this time, since the electric clamper 10 is disconnected, the expander does not become a load on the electric motor 11.

As described above, in the above embodiment, since the inlet pressure of the expander 2 is detected, control with quick response is possible.

Furthermore, when the rotation of the expander 2 is stopped, the refrigerant pump 4 is stopped and the control valve 6 is closed. This prevents the energy of the refrigerant in the refrigerant vapor generator 5 from escaping, and It rises quickly.

Further, when the electric motor 11 is used as the drive source, the electric clamper 10 is disconnected, and the expander 2 does not become a load.
No extra load is applied to the electric motor 11 (G).

Further, when the expander 2 is rotating, the rotor (not shown) of the electric motor 11 is also rotating, but this does not result in a large load.

And expander 2, electric motor 11. Since the compressors 12 are connected by the same shaft, they can be configured compactly.

Furthermore, since the detection point of the pressure detector 19 is located upstream of the control valve 6, the refrigerant pressure within the refrigerant vapor generator 5 can be sensed even when the control valve 6 is closed.

In the above embodiment, the heat source of the refrigerant steam generator 5 is solar heat, but the present invention is not limited to this, and a heat source such as gas or kerosene may be used.

In addition, the state of the refrigerant flowing into the expander 2 was detected by the refrigerant pressure near the inlet, but the refrigerant temperature or.

The surface temperature of the solar collector γ, the temperature or pressure inside the refrigerant vapor generator 5, etc. may be used as long as the state of the refrigerant flowing into the expander 2 can be detected directly or indirectly.

Further, the electric clutch 10 is not necessarily necessary, and there is no problem as long as the load on the expander 2 is small while the electric motor 11 is in use. For example, if the expander is a Rokuri type expander, the load is small.

In addition, although the cooling cycle is shown as the refrigeration cycle,
The cycle is not limited to this, and a heat pump cycle may also be used.

As is clear from the above embodiments, the air conditioner control device of the present invention has a power cycle including a refrigerant vapor generator, an expander, a condenser, and a refrigerant pump, and a compressor driven by the expander and electric motor. a refrigeration cycle consisting of an expander, a condenser, a pressure reducer, and an evaporator; a detector that directly or indirectly detects the state of the refrigerant flowing into the expander; and a detector that controls starting and stopping of the electric motor. A controller and an indoor thermostat for the air-conditioned room that is air-conditioned by the refrigeration cycle are provided, and the contacts of the indoor thermostat and the controller are connected in series, so that the drive source of the compressor can be automatically switched. This allows for comfortable air conditioning.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a control device for an air conditioner showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a main part of the control device for the air conditioner. 1... Power cycle, 2... Expander,
3... Condenser, 4... Refrigerant pump, 5
... Refrigerant vapor generator, 11 ... Electric motor, 12 ... Compressor, 13 ... ° ... Refrigeration cycle, 14 ... Condenser, 15... Pressure reducer, 16... Evaporator, 19... Pressure detector (detector), 20... Indoor thermostat, 23...
...Indoor thermostat contact, 24...Pressure detector contact, 25...Relay coil.

Claims (1)

[Claims] 1. A power cycle consisting of a refrigerant vapor generator, an expander, a condenser, and a refrigerant pump, and a refrigeration cycle consisting of a compressor, a condenser, a pressure reducer, and an evaporator driven by the expander and electric motor are provided. , a detector that directly or indirectly detects the state of the refrigerant flowing into the expander, a controller that controls starting and stopping of the electric motor using the detector, and an indoor thermostat of the air-conditioned room that is air-conditioned by the refrigeration cycle. A control device for an air conditioner, characterized in that the contact point of the indoor sensor and the controller are connected in series.