JP2614565B2 - 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 in which a plurality of indoor units having a heat exchanger for circulating water from a heat source unit for supplying cold or hot water are connected by a plurality of water pipes.

[0002]

2. Description of the Related Art As a prior art of an air conditioner in which a plurality of outdoor units are connected to a heat source unit for supplying cold or hot water by a water pipe, there is one disclosed in Japanese Utility Model Publication No. 58-1710.

[0003] Such an air conditioner is provided with a heat exchanger in which cold water or hot water circulates in the indoor unit, and a drain pan disposed below the heat exchanger.

[0004]

In the above-described air conditioner, cold or hot water is always supplied to the heat exchanger of the indoor unit, and the drain from the heat exchanger is drained to the drain pan in order to constantly drain the drain. In general, a drain hose that is arranged to be inclined toward is connected.

[0005] For this reason, when there is not enough space to incline the drain hose, the drain is difficult to flow, and there is a disadvantage that the indoor unit cannot be installed in a ceiling space or the like.

Further, since cold or hot water is constantly supplied to the heat exchanger, and even when the indoor unit is not operated, the indoor air is slightly cooled or heated, so that the cooling or heating of the water by the heat source unit is performed. There is a disadvantage that the required energy is wasted.

[0007] When the indoor unit is installed in a high place such as a ceiling space and cold water is supplied from a heat source unit,
Even when the operation of the indoor unit is stopped, the indoor air is cooled by the heat exchanger, and since the cooled air naturally descends, the warm indoor air is guided to the heat exchanger side. Energy on the machine is likely to be wasted.

[0008] The present invention provides an air conditioner having a high degree of freedom in installing an indoor unit and saving energy.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a ceiling having a heat source unit for supplying cold or hot water, a heat exchanger through which water from the heat source unit flows, and a drain pan disposed below the heat exchanger. In an air conditioner in which a plurality of indoor units installed in a space are connected by a water pipe, the indoor unit includes a drain pump that discharges drain in a drain pan, an on-off valve attached to the water pipe, and an indoor unit. And a control device for closing the on-off valve and stopping the drain pump when the operation of the machine is stopped.

[0010]

In this air conditioner, since the drain pump is provided in the indoor unit, the drain in the drain pan is pumped and drained by the drain pump.

In addition, a control device is provided for mounting the on-off valve on the water pipe and closing the on-off valve when the operation of the indoor unit is stopped.
When the operation of the indoor unit is stopped, the flow of the cold water to the heat exchanger is stopped by the on-off valve, and the heat loss in the heat exchanger is suppressed.

[0012]

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

In FIG. 1, reference numeral 31 denotes a heat source unit for supplying cold and hot water such as an absorption chiller / heater, and 1 denotes a ceiling space 3 of a building.
3 are a plurality of indoor units, and 34 and 35 are heat source units 3.
1 is a water pipe for connecting the indoor unit 1 with a water pipe 34.
, Water is sent to the indoor unit 1, and the water is returned to the heat source unit 31 by the water pipe 35.

Reference numeral 36 denotes an open / close valve using a thermal valve. The open / close valve controls the flow of cold water or hot water in the water pipe 35.

2 and 3, reference numeral 2 denotes a suspension bolt, 3
Is a suspending tool, 4 is a heat exchanger composed of a water pipe 5 through which cold or hot water flows and a heat transfer fin 6, and 7 is connected to three water pipes located at the bottom of the heat exchanger. The water inlet pipe, 8 is a large-diameter water inlet pipe connected to these three pipes, and 9 is a connection part of these pipes.

Reference numeral 10 denotes a water outlet pipe connected to three water pipes located above the heat exchanger 4, and reference numeral 11 denotes a large-diameter water outlet pipe connected to the pipes.

Reference numeral 12 denotes a drain pan disposed below the heat exchanger 4, 13 denotes a drain pump having a suction port at the lowest bottom of the drain pan, and 14 denotes a drain discharge drain connected to the drain pump. A hose 15 is a cover of the drain pump, and 16 is a float switch for detecting a water level in the drain pan 12.

Reference numeral 17 denotes an air vent pipe branched and connected to the upper part of the water outlet pipe 11, an air vent port 18, an air vent valve 19 opened at the time of the air venting operation, a knob 20 for opening and closing this valve, and an inner diameter of about 17 mm. A restriction device 21 for restricting the amount of drainage using a 1 mm capillary tube.

Since the limiting device 21 is provided,
The amount of drainage of water flowing from the air vent 18 when the air vent valve 19 is opened is limited to be smaller than the pumping amount of the drain pump 13.

Reference numeral 22 denotes a drain pipe arranged in the heat exchanger 4 so as to face the inside of the drain pan 12, and this drain pipe and the air vent 18 are connected by a resin pipe 30.

For this reason, during the air bleeding operation, the water mixed with the air is guided from the drain pipe 22 into the drain pan 12.

Reference numeral 23 denotes a blower arranged in the indoor unit 1.
It is composed of a sirocco fan 24 and a fan motor 25 controlled to be strong, medium, weak and weak.

Reference numeral 26 denotes an electric equipment box, in which a control device 27 composed of electric components for controlling the on-off valve 36, the drain pump 13 and the fan motor 25 is arranged.

Reference numeral 28 denotes a drain pan provided below the indoor unit 1 for receiving drain from an exposed metal portion such as a screw portion of the indoor unit.

Reference numeral 29 denotes a drain guide for receiving drain from a pipe connection or the like and guiding the drain to a drain pan 28.

Reference numeral 37 denotes a wireless remote controller having a room temperature sensor therein for transmitting a signal of a set temperature and a room temperature and a signal of an operation mode.

Numeral 38 denotes a receiving section provided on the suction grill 39.
A signal from the wireless remote controller 37 is received.

In the air conditioner configured as described above,
It is controlled as follows.

During the cooling operation, the control device 27 controls the on-off valve 3
6 and the drain pump 13 are controlled as shown in FIG.

The on-off valve 36 uses a thermal valve, and it takes 3 to 4 minutes to completely close. Therefore, the drain adheres to the heat exchanger 4 also at this time.

The drain pump 13 is provided with a delay time of about one minute from the start of closing of the on-off valve 36 in order to pump up and discharge the drain.

Since the delay time of about 1 minute is provided, the drain from the heat exchanger 4 is discharged to the drain pump 13 without overflowing from the drain pan 12 when the thermostat is turned off or the cooling operation is stopped.

Further, since the drain pump 13 is provided in the indoor unit 1, the drain can be pumped and discharged by the drain pump 13, and the degree of freedom of installation of the indoor unit 1 can be increased.

When the drain pump 13 stops due to a malfunction, the drain switch 13 starts operating because the float switch 16 detects an abnormal water level due to a rise in the water level.

In the cooling operation, the on-off valve 36 and the fan motor 25 are switched according to the difference between the room temperature and the set temperature.
Is controlled by the control device 27 as shown in FIG.

A 3-minute hold timer is provided for opening and closing the on-off valve 36, and the on-off valve 36 is not opened or closed for a shorter time.

During the cooling operation, that is, when the cold water is supplied to the water pipe 34, the on-off valve 36 is controlled to be opened and closed by the control device 27, and when the cold water flowing through the water pipe 34 is unnecessary (at the time of thermo-off, at the time of operation stop) Since it can be stopped, the heat loss in the heat exchanger 4 is suppressed, and the energy required for cooling the water by the heat source unit 31 can be saved.

During the dry operation, control is performed by the control device 27 as shown in FIG. 6 according to the difference between the room temperature and the set temperature.

When the room temperature is higher than or equal to 15 ° C. and lower than the set temperature minus 1 ° C., the controller 27 performs the dry B operation in which the temperature drop is small.

The room temperature is equal to or higher than the set temperature minus 1 ° C.
In addition, when the temperature is in a range of less than the set temperature plus 2 ° C., the control device 27 performs a dry A operation in which the temperature is slightly lowered.

When the room temperature is equal to or higher than the set temperature plus 2 ° C., the control device 27 performs a cooling operation for lowering the temperature to dehumidify the room.

During the heating operation, the on-off valve 36 and the fan motor 25 are controlled by the control device 27 as shown in FIG. 7 according to the difference between the room temperature and the set temperature.

Note that a 30-second hold timer is provided for air blowing, and a 1-minute hold timer is provided for automatic air volume switching.

As described above, the indoor unit 1 is controlled in accordance with the difference between the indoor temperature and the set temperature during the cooling operation and the heating operation, so that the air conditioner can automatically control the indoor temperature. it can.

The controller 27 opens and closes the on-off valve 36 only when the heat source unit 31 supplies cold water, such as during a cooling operation or a dry operation. Therefore, the life of the on-off valve 36 can be extended.

Further, since a thermal valve is used as the on-off valve 36, it is cheaper and quieter than an electromagnetic valve or the like.

[0047]

The present invention relates to an air conditioner in which a heat source unit for supplying cold water or hot water and a plurality of indoor units are connected by a water pipe, wherein a drain pump, an on-off valve, a cold water Since the drain pump pumps and drains the drain in the drain pan because the control device that controls this open / close valve and the drain pump when the air is supplied, the degree of freedom of installation of the indoor unit can be increased and the narrow ceiling Indoor units can be installed in the space.

Further, when the operation of the indoor unit is stopped, the flow of the cold water to the heat exchanger is stopped, and the heat loss in the heat exchanger can be suppressed, so that the energy in the heat source unit can be saved.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of an indoor unit of the air conditioner.

FIG. 4 is a diagram showing control of a drain pump and an on-off valve during a cooling operation of the air conditioner.

FIG. 5 is a diagram showing control during cooling operation of the air conditioner.

FIG. 6 is a diagram showing control during a dry operation of the air conditioner.

FIG. 7 is a diagram showing control during a heating operation of the air-conditioning apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor unit 4 Heat exchanger 12 Drain pan 13 Drain pump 27 Control device 31 Heat source unit 33 Ceiling space 34, 35 Water piping 36 On-off valve

Claims (1)

(57) [Claims] 1. A heat source device for supplying cold water or hot water, a heat exchanger through which water from the heat source device flows, and a plurality of drain pans disposed below the heat exchanger and installed in a ceiling space. In the air conditioner in which the indoor unit is connected to the indoor unit by a water pipe, the indoor unit includes a drain pump for discharging drain in a drain pan, an on-off valve attached to the water pipe, and the on-off valve when the operation of the indoor unit is stopped. And a control device for closing the drain pump and stopping the drain pump.