JPH0552384A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide an air conditioner wherein air of low temperature can be blown off at the beginning of cooling operation and further dewdrops are prevented from falling from a unit. CONSTITUTION:An air conditioner 20 comprises a compressor 1, an outdoor heat exchanger 3, a pressure reducing device 4, and an indoor heat exchanger 5, wherein a control device 15 is provided to operate the compressor 1 intermittently for a predetermined set time during the stoppage of cooling operation. With this arrangement, the heat exchanger 5 is cooled at a temperature lower than the room temperature by a predetermined temperature, so that air of low temperature can be blown off at the beginning of cooling operation. Furthermore, even if dewdrops attach to a unit having the indoor heat exchanger, the dewdrops are naturally evaporated during the stoppage of the compressor so that the dewdrops are prevented from falling down to the utmost extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a compressor, an outdoor heat exchanger, a pressure reducer and an indoor heat exchanger.

[0002]

2. Description of the Related Art In a conventional air conditioner, the temperature of an indoor heat exchanger often becomes almost the same as room temperature while the operation of the air conditioner is stopped.

Therefore, particularly when the indoor blower is operated at the start of the cooling operation, uncooled air is blown out and the user feels uncomfortable.

An air conditioner that turns on and off the compressor so that the air having a predetermined temperature is blown out when the heating operation is started and the temperature of the indoor heat exchanger is kept at the predetermined temperature when the heating operation is stopped, It is described in JP-A-3-28651.

However, the air conditioner described in this publication is constructed such that air having a predetermined temperature is blown out at the start of heating operation, and air having a predetermined temperature is blown out at the start of cooling operation. It is not configured in.

Although it is possible to configure the air conditioner so that cold air of a predetermined temperature is blown out at the start of the cooling operation by applying the technique described in the above-mentioned publication, the temperature of the indoor heat exchanger can be controlled. Since the temperature detector for detection has a time delay, the heat exchanger may be cooled to a temperature below the dew point temperature, which may cause dew condensation and dripping of the unit.

When the indoor heat exchanger is cooled to a predetermined temperature when the humidity is high, the unit may be condensed and the dew may drip.

The present invention provides an air conditioner which can blow out low-temperature air at the start of cooling operation and can prevent dew drop from the unit.

[0009]

The present invention relates to an air conditioner provided with a compressor, an outdoor heat exchanger, a decompressor and an indoor heat exchanger, wherein the compressor is set for a preset time while the cooling operation is stopped. It is equipped with a control device for intermittent operation.

[0010]

In this air conditioner, the compressor is intermittently operated for a preset time while the cooling operation is stopped by the control device, so that the indoor heat exchanger is cooled by a predetermined temperature with respect to the room temperature while the cooling operation is stopped. It has been chilled.

Moreover, even if dew adheres to the unit having the indoor heat exchanger, this dew naturally evaporates while the compressor is not operating.

[0012]

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

1 to 4 show an embodiment of the present invention.

In FIG. 1, 1 is an operating frequency [8 Hz-
120 Hz], a compressor whose capacity can be changed by 2, a four-way valve for switching the refrigerant flow path, 3 an outdoor heat exchanger, 4 a pressure reducer, 5 an indoor heat exchanger arranged in the indoor unit 6, 7
Is an accumulator.

The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the pressure reducer 4, the indoor heat exchanger 5, and the accumulator 7 are sequentially connected by refrigerant pipes 8, 9, 10, 11, 12, 13. The refrigeration circuit 14 is configured.

Reference numeral 15 is a control device for controlling the operation of the compressor 1 and the outdoor blower 16, and 17 and 18 are outdoor and indoor temperature detectors, respectively.

Further, the control device 15 includes an indoor blower 19
Also controls the operation of.

As described above, the air conditioner 20 is mainly composed of the refrigeration circuit 14 and the controller 15.

In FIG. 2, 21 is an exterior body of the indoor unit 6, 22 is a dew tray for receiving dew from the indoor heat exchanger 5,
23 is a vertical blade for changing the blowing air to the left and right, 24
Is a horizontal blade for changing the blown air up and down, 25 is an outlet, and 26 is an inlet.

In FIG. 3, 27 is a wireless remote controller, 28 is an operation switch, 29 and 30 are operation switches,
Reference numeral 31 is a display unit showing the set temperature, the room temperature, the operation mode and the like.

These switches 28, 29 and 30 are provided with a lid 51.
The switch is provided to set the room temperature when the lid is opened.

In the air conditioner thus constructed, when the operation switch 29 is pressed while the cooling operation is stopped, the air conditioner operates as described below (see FIG. 4).

At least one of room temperature and outside temperature is 2
If the temperature is not higher than 5 ° C., the control for intermittently operating the compressor 1 and the outdoor blower 16 for a preset time is not performed.

The control is not performed within 10 minutes after the cooling operation is stopped.

The reason for this is that when the room temperature or the outside air temperature is low, control for rapidly blowing cold air is not required, and
This is because immediately after the cooling operation is stopped, the heat exchanger 5 is cold and the cold air is blown out immediately after the operation switch 28 is turned on without performing control for rapidly blowing out the cool air.

At least one of room temperature and outside temperature is 2
When the temperature is 5 ° C. or higher and 10 minutes have elapsed after the cooling operation was stopped, the controller 15, the compressor 1 and the outdoor blower 16 are operated for 1 minute and intermittently operated for 10 minutes.

The frequency of the compressor 1 when operating for 1 minute is 10 Hz, which is close to the minimum operating frequency.

When the intermittent operation is performed, the indoor heat exchanger 5
Is kept at about room temperature minus 5 ° C.

The reason why the indoor heat exchanger 5 is kept at approximately room temperature minus 5 ° C. in the intermittent operation is as follows.

For example, considering keeping the indoor heat exchanger 5 at approximately room temperature minus 10 ° C. by merely intermittent operation,
This temperature is often lower than the dew point temperature, and the indoor unit 6 is cooled by the heat exchanger 5 to cause dew condensation, and the dew of the indoor unit 6 grows significantly, and for example, there is a possibility that the dew drops from the outlet 25.

Since the drain pan 22 is provided below the heat exchanger 5, dew is received by the drain pan 22, but when dew grows on the indoor unit 6 and the dew grows and drops,
This dew stains or damages furniture, electrical appliances, carpets and the like below the indoor unit 6.

Therefore, it is not preferable to control the indoor heat exchanger 5 to cool so much that the dew attached to the indoor unit 6 grows.

Considering severe conditions, for example, when it rains or when it is cooked indoors without rotating the ventilation fan, the room temperature is 30 ° C. and the humidity is 90%. Although the dew point temperature is about 28 ° C., such a severe condition is rare in practice, and the dew point temperature is often a little lower than room temperature, for example, 3 to 4 ° C. lower.

When the indoor unit 6 cools to the indoor heat exchanger 5 below the dew point temperature, dew condensation occurs, but since there is a time lag, even if dew condensation occurs on the indoor unit 6, the indoor unit 6 will be slightly faint. Dew is attached.

If the indoor heat exchanger 5 is kept in this state, the dew in the indoor unit 6 may grow and drop.

However, in this air conditioner 20, the compressor 1
, The dew of the indoor unit 6 does not grow, and the dew of the indoor unit 6 is generated when the compressor 1 is stopped, that is, when the indoor heat exchanger 5 is not cooled. It spontaneously evaporates.

As described above, the control device 1 is operated while the cooling operation is stopped.
5, the compressor 1 and the outdoor blower 16 are operated for 1 minute, 1
When intermittent operation is performed for 0 minutes, even if dew is attached to the indoor unit 6, the dew spontaneously evaporates while the compressor 1 is stopped, that is, when the indoor heat exchanger 5 and the indoor unit 6 are not cooled. , Dew does not grow and drip.

When the operation switch 28 is pushed during the intermittent operation, the indoor blower 19 is operated by starting the cooling operation, and the room blower 19 is operated at about room temperature minus 5
C cold air is blown out.

If the operation switch 28 is not operated during 72 hours, the intermittent operation of operating the compressor 1 and the outdoor blower 16 for 1 minute and 10 minutes is stopped.

On a hot day, the user may want to return home from home or take a bath after hitting a strong wind.

In such a case, when the operation switch 30 of the remote controller 27 is pushed, the air conditioner 20 is controlled as follows.

When the operation switch 30 is pressed during the cooling operation, the blower 19 is controlled to be stronger than the normally controlled strong blow, and the operating frequency of the compressor 1 is controlled to the maximum frequency.

When controlled in this way, the user can feel a great deal of comfort since he can hit the strong cold wind after returning home or taking a bath in summer.

However, this control is performed only for 15 minutes, and after 15 minutes have elapsed, the normal cooling operation is resumed.

[0045]

INDUSTRIAL APPLICABILITY According to the present invention, in an air conditioner provided with a compressor, an outdoor heat exchanger, a decompressor and an indoor heat exchanger, the compressor is intermittently operated at a preset time while the cooling operation is stopped. Since the control device is provided, the indoor heat exchanger is cooled to a room temperature by a predetermined temperature while the cooling operation is stopped, and low-temperature air can be blown at the start of the cooling operation.

Moreover, even if dew adheres to the unit having the indoor heat exchanger, the dew naturally evaporates while the compressor is not operating, so that the dew drop from the unit can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a sectional view of an indoor unit of the air conditioner showing the embodiment.

FIG. 3 is a front view of a remote controller of the air conditioner.

FIG. 4 is a flowchart showing control of the air conditioner.

[Explanation of symbols]

 1 Compressor 3 Outdoor heat exchanger 4 Pressure reducer 5 Indoor heat exchanger 15 Control device 20 Air conditioner

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masato Watanabe 2-18 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. Incorporated (72) Inventor Shohei Nomura 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. An air conditioner comprising a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger, comprising a control device for intermittently operating the compressor at a preset time while the cooling operation is stopped. An air conditioner characterized by that.