JP3442248B2 - 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 that performs a cooling operation and a heating operation, and more particularly to prevention of dew condensation in an air passage.

[0002]

2. Description of the Related Art A conventional dew condensation preventing device for an air conditioner is disclosed, for example, in Japanese Utility Model Laid-Open No. 2-147720. This is an air conditioner equipped with a heat exchanger for cooling and an air blower that blows out air from an air outlet after cooling the air sucked from the air inlet through the heat exchanger for cooling. A dew condensation sensor is provided, and the amount of air blown by the blower is variably controlled based on the detection signal from the dew condensation sensor.

[0003]

Since the conventional dew condensation preventing device for an air conditioner is constructed as described above, dew condensation is prevented by controlling the dew condensation sensor during operation, especially on the outside of the air passage. However, it is not detected in the wind path.

In addition, immediately after switching from the cooling operation to the heating operation, or when the indoor unit is stopped as in the case of the multi-type, the refrigerant flows and the heat exchanger is exposed to dew, and then the heat is generated by the heating operation. When the exchanger gets warm, there is a problem that dew condensation occurs in the air passage due to steam from the heat exchanger.

The present invention has been made to solve the above problems, and particularly when the indoor unit in the cooling operation is switched to the heating operation, or even after the indoor unit in the operation is stopped, the air passage The purpose is to obtain an air conditioner that can prevent condensation inside.

[0006]

[0007]

[0008]

An air conditioner according to the invention of claim 1 is provided with an indoor unit main body, an indoor heat exchanger provided in the indoor unit main body for exchanging heat with indoor air, and an indoor heat exchange provided in the indoor unit main body. A fan that blows the air that has been heat-exchanged in the room through the air duct into the room, a dew condensation detection unit that is installed in the air duct and that detects dew condensation, and a dew condensation detection unit that detects dew condensation when the cooling operation is stopped. Includes means for rotating the blower for a certain period of time so that the steam that spontaneously evaporates from the indoor heat exchanger is blown out of the air passage.

The air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect, wherein the means for rotating the blower for a certain period of time operates when the cooling operation is switched to the heating operation. is there.

An air conditioner according to a third aspect of the present invention includes an indoor unit main body, an indoor heat exchanger provided in the indoor unit main body for exchanging heat with the indoor air, and an indoor heat exchange provided in the indoor unit main body. A blower that blows the air that has been heat-exchanged in the room through the air passage into the room, an indoor piping temperature detection unit that is installed in the indoor heat exchanger and detects the indoor piping temperature, and the indoor piping temperature when the cooling operation is stopped. When the detecting means detects that the temperature of the indoor piping has risen above a preset temperature within a certain time, the blower is blown for a certain period of time so that the steam that spontaneously evaporates from the indoor heat exchanger is blown out of the air passage. And means for rotating the.

An air conditioner according to a fourth aspect of the present invention is the air conditioner according to the third aspect, which is provided with one outdoor unit and a plurality of indoor units.

[0013]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a circuit configuration diagram of an air conditioner according to Embodiment 1 of the present invention. In the figure, 1 is an AC power supply, 2 is a low voltage power supply circuit connected to the AC power supply circuit 1 and low voltage circuit, 3 is control means, 4 is control means 3.
A signal receiving circuit 5 connected to the operation receiving means 5 is an operation content setting means, which normally transmits a signal to the signal receiving circuit 4 by an infrared signal or the like. Reference numeral 6 is a fan motor control means for receiving a signal from the control means 3, and 7 is a fan motor for driving a blower (fan) to which electric power is supplied from the AC power source 1 by the fan motor control means 6.

FIG. 2 is a vertical sectional view of the air conditioner according to the first embodiment of the present invention, showing a state in which dew due to steam is attached to the air passage. In the figure, 12 is a heat exchanger, and 13 and 14 are a first air passage forming member and a second air passage forming member that form an air passage.

In FIG. 1, when the AC power source 1 is applied and the DC power source is applied to each circuit by the low voltage power source circuit 2, when the operation setting is performed by the operation content setting means 5, the control means 3 becomes Signal receiving circuit 4 for normal infrared signals
Receive the settings through. The control means 3 sends a control signal to the connected fan motor control means 6 to control the rotation of the fan motor 7 by varying the supply of the electric power of the AC power supply 1 to the fan motor 7.

In the present embodiment, as shown in the flow chart of FIG. 3, during the cooling operation (step S
1), when switched to heating operation (step S2),
The cooling operation is stopped (step S3), and the heating operation is started (step S4). When the heating operation starts, the dew condensation prevention timer starts counting (step S
5) Rotate the fan motor 7 for a certain period of time (step S
6) The rotation is continued until the dew condensation prevention timer counts up (step S7). When the dew condensation prevention timer counts up (step S7), the fan motor 7 returns to the normal control and stops when the indoor tube temperature is low (step S8).

By the above operation, when the heating operation is started with the dew on the heat exchanger 12 during the cooling operation, the air naturally evaporates and the dew is adhered to the wall surface of the air passage 14, but for a certain period of time. By rotating the fan motor 7 and continuing until the timer for dew condensation prevention counts up, the naturally evaporated steam does not reach the wall surface of the air passage 14 and does not condense in the air passage.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a circuit configuration diagram of an air conditioner according to Embodiment 2 of the present invention. In the figure, 8 is a dew condensation detecting means, which is connected to the control means 3 via a dew condensation signal input circuit 9. Others are the same as in FIG.

FIG. 5 is a vertical sectional view of an air conditioner according to a second embodiment of the present invention, showing a state in which dew due to steam is attached to the air passage. As shown in the figure, the dew condensation detecting means 8 is attached to the air passage on the downstream side of the heat exchanger 12. Others are the same as FIG.

In FIG. 4, when the AC power source 1 is applied and the low voltage power source circuit 2 applies the DC power source to each circuit, when the operation content setting means 5 sets the operation, the control means 3 Signal receiving circuit 4 for normal infrared signals
Receive the settings through. The control means 3 sends a control signal to the connected fan motor control means 6 to control the rotation of the fan motor 7 by varying the supply of the electric power of the AC power supply 1 to the fan motor 7.

In the present embodiment, the dew condensation detecting means 8
When it is detected that condensation has occurred on a preset portion via the condensation signal input circuit 9, the control means 3 controls the fan motor control means 6 to rotate the fan motor 7. As shown in the flowchart of FIG. 6, when the heating operation is switched to during the cooling operation (step S11) (step S12), the cooling operation is stopped (step S11).
13) The heating operation is started (step S14).
When the heating operation is started, it is determined by the dew condensation detecting means 8 via the dew condensation signal input circuit 9 whether or not dew is condensed on a preset portion (step S15). When it is determined that there is condensation, the condensation prevention timer starts counting (step S16), the fan motor 7 is rotated for a certain time (step S17), and rotation continues until the condensation prevention timer counts up. (Step S18). When the dew condensation preventing timer counts up (step S19), the fan motor 7 returns to the normal control and stops when the indoor pipe temperature is low in general. Also,
When it is determined that no condensation has occurred (step S15), the fan motor returns to normal control and stops without counting the condensation prevention timer (step S19).

By the above operation, when the heating operation is started with the dew on the heat exchanger 12 during the cooling operation, the air naturally evaporates and dew is attached to the wall surface of the air passage 14. When it is determined by the means input 8 that dew condensation has occurred on the preset portion, the fan motor is rotated for a certain period of time and the dew condensation prevention timer continues until the timer counts up, so that the steam is on the wall surface of the air passage 14. Condensation in the airway does not grow without reaching.

Embodiment 3. Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a circuit configuration diagram of an air conditioner according to Embodiment 3 of the present invention. In the figure, reference numeral 10 is an indoor pipe temperature detection means, which is connected to the control means 3 via an indoor pipe temperature input circuit 11.

FIG. 8 is a vertical cross-sectional view of an air conditioner according to a third embodiment of the present invention, showing a state in which dew due to steam is attached in the air passage. As shown in the figure, the indoor pipe temperature detecting means 10 is attached to the heat exchanger 12. Others are the same as FIG.

In FIG. 7, when the AC power source 1 is applied and the DC power source is applied to each circuit by the low voltage power source circuit 2, when the operation setting is performed by the operation content setting means 5, the control means 3 Signal receiving circuit 4 for normal infrared signals
Receive the settings through. The control means 3 sends a control signal to the connected fan motor control means 6 to control the rotation of the fan motor 7 by varying the supply of the electric power of the AC power supply 1 to the fan motor 7.

In the present embodiment, the indoor pipe temperature detecting means 10 causes the indoor pipe temperature input circuit 11 to
When detecting that the temperature of the inner pipe temperature has risen above the preset temperature, the control means 3 controls the fan motor control means 6 to rotate the fan motor 7.

As shown in the flow chart of FIG. 9, while operating in the cooling operation (step S21), the cooling operation is stopped by the stop signal (step S22). Pipe temperature input circuit 11
If the temperature of the indoor piping rises above the set temperature within a certain time (step S23), the control means 3 determines that dew condensation occurs (step S2).
4) The dew condensation prevention timer starts counting (step S25), the fan motor 7 is rotated for a certain time (step S26), and the rotation is continued until the dew condensation prevention timer counts up (step S27). When the dew condensation prevention timer counts up (step S2
7), the fan motor 7 returns to the normal control and stops in the general case.

When the cooling operation is stopped by the stop signal (step S22), if the data of the indoor pipe temperature detecting means 10 by the indoor pipe temperature input circuit 11 determines that there is no dew condensation (step S24), the dew condensation prevention is performed. The fan motor 7 returns to the normal control and stops without counting the timer for use (step S28).

By the above operation, when the temperature of the indoor piping rises above the set temperature while the heat exchanger 12 is exposed to dew during the cooling operation, the air passage 1 evaporates naturally.
Although there was dew on the wall surface of No. 4, the control means 3 judges that it is a condition for causing dew condensation, and the fan motor 7 is rotated for a certain period of time to continue until the dew condensation preventing timer counts up. There is no condensation on the air duct component 14 without the generation of steam.

Further, in the above-described embodiment, a model in which one indoor unit is connected to one outdoor unit has been described, but a plurality of indoor units are connected to one outdoor unit. In the case of the connected multi-model, it is possible to prevent the occurrence of dew condensation in the stopped indoor unit, which is more effective.

[0031]

EFFECTS OF THE INVENTION The air conditioner according to the present invention can prevent dew condensation in the air passage after the cooling operation is stopped and the operation is stopped or the cooling operation is switched to the heating operation. Further, since the detection of dew condensation in the air passage is determined by using the timing of switching from the cooling operation to the heating operation, the device can be made inexpensive. Further, by providing the dew condensation detecting means, it is possible to judge that the dew condensation prevention operation is unnecessary even at the timing of switching the operation mode, and it is possible to perform more effective air conditioning operation. Further, by detecting the temperature of the indoor piping and determining the conditions under which dew condensation occurs, the timing of switching from cooling to heating operation is not used, so that control is highly effective in a multi-model that uses a plurality of indoor units.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a vertical cross-sectional view of the air conditioner according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing control of the air conditioner according to Embodiment 1 of the present invention.

FIG. 4 is a circuit configuration diagram of an air conditioner according to Embodiment 2 of the present invention.

FIG. 5 is a vertical sectional view of an air conditioner according to Embodiment 2 of the present invention.

FIG. 6 is a flowchart showing control of the air conditioner according to Embodiment 2 of the present invention.

FIG. 7 is a circuit configuration diagram of an air conditioner according to Embodiment 3 of the present invention.

FIG. 8 is a vertical cross-sectional view of an air conditioner according to Embodiment 3 of the present invention.

FIG. 9 is a flowchart showing control of the air conditioner according to Embodiment 3 of the present invention.

[Explanation of symbols]

1 AC power supply, 2 low voltage power supply circuit, 3 control means, 4
Signal receiving circuit, 5 operation content setting means, 6 fan motor control means, 7 fan motor, 8 dew condensation detecting means, 9
Condensation signal input circuit, 10 indoor pipe temperature detection means, 1
1 Indoor piping temperature input circuit, 12 Indoor heat exchanger, 13
First air passage component, 14 Second air passage component.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Kazama 2-6-2 Otemachi, Chiyoda-ku, Tokyo Within Mitsubishi Electric Engineering Co., Ltd. (72) Toshiya Sugiyama 2-6-2 Otemachi, Chiyoda-ku, Tokyo Issue Mitsubishi Electric Engineering Co., Ltd. (56) Reference JP-A-9-14735 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 11/02-11/08

Claims (4)

(57) [Claims] 1. An indoor unit main body, an indoor heat exchanger provided in the indoor unit main body for exchanging heat with indoor air, and an air provided in the indoor unit main body and heat-exchanged by the indoor heat exchanger. A blower for blowing air into the room through an air passage, a dew condensation detecting means provided in the air passage for detecting dew condensation, and when the dew condensation detecting means detects dew condensation when the cooling operation is stopped, the indoor heat An air conditioner comprising: a unit that rotates the blower for a certain period of time so that steam that spontaneously evaporates from the exchanger is blown out of the air passage. Wherein means for rotating said predetermined time the blower is, when switching from the cooling operation to the heating operation, the air conditioner according to claim 1, wherein the work. 3. An indoor unit main body, an indoor heat exchanger provided in the indoor unit main body for exchanging heat with indoor air, and air provided in the indoor unit main body and having undergone heat exchange in the indoor heat exchanger. There is an air blower for blowing air into the room through an air passage, an indoor pipe temperature detecting means provided in the indoor heat exchanger for detecting the indoor pipe temperature, and the indoor pipe temperature detecting means when the cooling operation is stopped. When it is detected that the temperature of the indoor piping has risen above a preset temperature within the time, the blower is rotated for a certain period of time so that the steam that spontaneously evaporates from the indoor heat exchanger is blown out of the air passage. An air conditioner characterized by comprising: 4. The air conditioner according to claim 3 , comprising one outdoor unit and a plurality of indoor units.