JPH07120005A - Air-conditioning apparatus - Google Patents

Abstract

PURPOSE:To enable using a cold-air dehumidifier as a hot-air heater and using it for hot-air heating when the room temperature is low. CONSTITUTION:The subject relates to a cold-air dehumidifier which is equipped with a refrigeration cycle inside a casing 1. Fir the supply of hot air the number of revolution of a cold-air fan 5 is increased or that of a hot-air fan 5 is decreased, the efficiency of the refrigeration cycle is lowered, the temperature of the refrigerant discharged from the compressor 2 is raised, the range of an increase of the hot-air temperature is increased, and hot air of high temperature can be provided when the temperature is low. Furthermore, duct sensors 10 are provided close to cold/hot-air outlets 7, 8 respectively so that a duct 9 can be prevented from being attached wrongly and the compressor 2, from being damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a cold air dehumidifier having a refrigeration cycle provided with a compressor, a condenser and an evaporator in a frame so that it can be used as a heater.

[0002]

2. Description of the Related Art A proposal for constructing a heater using a cool air dehumidifier equipped with a compressor, a condenser and an evaporator in a frame is the applicant's application, Japanese Utility Model Application No. 63-14790.
It is well known for its number. When this air conditioner is used in a closed space, dehumidification operation is performed, and since dehumidification that lowers indoor humidity is an isenthalpic change in a closed indoor space, the room temperature tends to rise, and the electricity consumed during operation is also reduced. The room temperature rises due to energy, and the dehumidifying operation also functions as the heating operation.

Conventionally, in order to improve heating efficiency, cold air is exhausted to the outside using a duct, and if the room temperature is a living space of 10 ° C. or higher, plus 20 is added.
It can blow hot air above ℃ and is effective as a hot air blower.

Further, unlike a heat pump air conditioner which blows cold air to the condenser, warm room air is blown to the condenser in a state where warm air can be heated, so that the condenser can be used without fear of freezing.
Therefore, even if high efficiency like a heat pump air conditioner using a refrigeration cycle cannot be expected, the rise in room temperature is more efficient than a heater using an electric heater, and if the average room temperature rises, the warm air blown toward the user. The temperature rises.

[0005]

The preferred method of using the cold air dehumidifier as a warm air machine is to start the operation when the feeling of a little cold starts, but the operation is started in an extremely cold room. However, as with the small electric heaters currently on the market, there is a problem that the expected heating cannot be obtained. For this reason, cold air that hinders the rise in room temperature is exhausted to the outside of the room by ducts, and the greatest challenge is to lower the minimum room temperature that can be used, so distinguish it from normal cold air dehumidification operation. A heating operation mode is provided, and each devised system is operated to perform an operation to improve efficiency, but it is still not sufficient.

[0006]

The present invention improves the efficiency of heating operation so that it can be used even at a lower room temperature. A compressor 2, a condenser 3 and an evaporator are provided in a frame 1 arranged indoors. In a cool air dehumidifier that attaches 4 and sucks indoor air by the cool air / warm air fans 5 and 6 installed in the frame 1 and blows out as cold air / warm air,
During warm air operation, the number of rotations of the cold air fan 5 is increased or the number of rotations of the warm air fan 6 is decreased, and a duct 9 connected to the cold air outlet 7 or the warm air outlet 8 is provided, and the duct 9 is attached to the duct. The sensor 10 is attached, the duct sensor 10 detects an attachment position defect of the duct 9 in the warm air operation, and stops the operation of the compressor 2 to prevent abnormal operation.

Further, two evaporators 4 mounted in the frame 1 are mounted in parallel so that the air flow is equal to that of both evaporators 4.
And the refrigerant pipe to the evaporator 4 is connected in parallel, and the solenoid valve 1 is connected to the refrigerant pipe of one evaporator 4.
1 is attached, the solenoid valve 11 is opened during hot air operation, and the refrigerant is supplied to the two evaporators 4.

Further, a cold air temperature sensor 12, an open / close damper 13 for the cold air outlet 7, and a cool air escape passage 14 that opens / closes in conjunction with the open / close damper 13 are provided in the cold air flow path blown out from the cold air fan 5. When the cold air temperature sensor 12 detects a temperature equal to or higher than a predetermined temperature during warm air operation, the open / close damper 13 is closed and the cold air escape passage 14 is opened to switch to indoor exhaust, so that the exhaust air temperature is high even if the duct 9 is attached. It is possible to prevent heat energy loss.

Further, a hot air passage extending from the hot air fan 6 to the hot air outlet 8 is branched to form a bypass passage 15 communicating with the evaporator 4, and a temperature sensor 16 for detecting room temperature or hot air temperature is provided. Temperature sensor 16 during warm air operation
Detects a temperature equal to or lower than a predetermined temperature, hot air is supplied from the bypass passage 15 to the evaporator 4, and the hot air before the indoor air is not mixed prevents the evaporator 4 from freezing.

[0010]

[Operation] The structure of the cool air dehumidifier is exactly the same as the conventional product,
In the heating operation mode, the duct 9 for exhausting air to the outside is attached to the cold air outlet 7 to increase the rotation speed of the cold air fan 5, so that the refrigerant is vaporized in the evaporator 4 even in low temperature indoor air, and the compressor is compressed. The refrigerant never returns to the liquid state as liquid 2.

Further, by reducing the rotation speed of the hot air fan 6, the gaseous refrigerant pressurized by the compressor 2 is cooled by the entire condenser 3 and flows into the evaporator 4, so that it passes through the condenser 3. The warm air temperature rises.

On the other hand, the duct 9 for exhausting air to the outside has a considerable flow resistance, and if the duct 9 is mistakenly attached to the hot air outlet 8 in the heating operation mode in which the number of rotations of the hot air fan 6 is reduced, cooling is performed. Evaporator 4 with high temperature due to lack of refrigerant
However, the trouble that the compressor 2 is abnormally loaded and destroyed may occur, but this can be prevented by combining it with a safety device for attaching the duct 9.

Further, when performing a heating operation at a low room temperature, it is a requirement to obtain a high temperature hot air without raising the room temperature quickly. In the present invention, when the temperature of the air that has cooled the evaporator 4 is still high. Prevents the loss of heat energy by returning it indoors without exhausting it outside.

Further, as a trouble when the heating operation is performed at a low room temperature, there is freezing of the evaporator. When there is a fear of freezing, hot air is directly sent to the evaporator 4 to cope with the freezing trouble.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the drawings. 1 is a frame of a cold air dehumidifier that operates in hot air, 2 is a compressor mounted in the frame 1, 3 is a condenser, and 4 is an evaporator. The refrigerant pressurized by the compressor 2 is liquefied by the condenser 3, passes through the capillary 17, is gasified by the evaporator 4, and is returned to the compressor 2 again to form a refrigeration cycle. 5 is an evaporator 4
A cold air fan that blows the cooled air obtained in step 7 is a cold air outlet that blows the cool air out of the frame 1. Further, 6 is a warm air fan that blows high temperature air obtained by the condenser 3, and 8 is a warm air outlet for blowing warm air to the outside of the frame 1.

Reference numeral 9 denotes a duct which is detachably attached to the cold air outlet 7 or the warm air outlet 8, and the other end of the duct 9 extends to the outside of the room to provide warm air when using cold air or cold air when using warm air. Is discharged to the outside by the duct 9. Reference numeral 10 is a duct sensor provided at the duct 9 attachment portion of the cold air outlet 7 or the hot air outlet 8, and when the cold air / warm air operation and the attachment position of the duct 9 which are instructed by the user are incorrect,
The operation of the compressor 2 is stopped, and an alarm lamp notifies the abnormality if necessary.

Reference numeral 18 denotes a water tank for accommodating the drainage condensed by the evaporator 4. When the water tank 18 becomes full, the full water detection switch 19 operates to stop the operation of the compressor 2 or to issue an alarm. Reference numeral 20 is an operation switch of the air conditioner, 21 is a cold air switch, and 22 is a hot air switch. When the duct 9 is attached to the hot air outlet 8 and the cold air switch 21 is operated, a cold air operation mode is set and hot air is discharged to the outside of the room. In addition, the cold air is blown out from the cold air outlet 7. If the cold air switch 21 is operated without using the duct 9, cold air / warm air is discharged into the room, and the dehumidifying operation is performed in the closed room.

On the other hand, when the duct 9 is attached to the cold air outlet 7 and the warm air switch 22 is operated, a warm air operation mode is set, and the rotation speed of the cold air fan 5 is increased. Alternatively, the number of rotations of the warm air fan 6 is reduced. If the number of rotations of the cold air fan 5 increases, even in low temperature indoor air, vaporization is promoted in the evaporator 4, and the refrigerant does not return to the compressor 2 as a liquid. However, the temperature of the gasified refrigerant is increased by approaching room temperature by exchanging heat with the room air, which may cause overload of the compressor 2.

When the number of rotations of the warm air fan 5 is reduced, the amount of air passing through the condenser 3 is reduced, the liquefaction of the refrigerant is delayed and the condenser 3 maintains a high temperature, and the warm air temperature rises. At this time, since the temperature of the refrigerant discharged from the condenser 3 also rises, even if the refrigerant is cooled by the evaporator 4, the refrigerant may return to the compressor 2 as a liquid, which causes an overload of the compressor 2.

In the compressor 2 which is about to overload, not only the temperature of the discharged refrigerant but also the temperature of the main body of the compressor 2 rises. Therefore, if the heat of the compressor 2 is radiated to the air flow toward the condenser 3, the temperature of the warm air is increased. It will rise further.

In the configuration of the present invention, since the compressor 2 is burdened in the warm air mode, if the duct 9 is attached to the warm air outlet 8 by mistake, the blowing resistance increases and the heat radiation of the condenser 3 becomes worse. Which causes failure of the compressor 2. Therefore, a safety device for attaching the duct 9 is required, and the cold air / warm air outlet 7
The duct sensor 10 attached to the unit 8 detects a mounting failure, and stops the compressor 2 and issues an alarm.

On the other hand, in order to improve the vaporization of the refrigerant in the evaporator 4, two evaporators 4 are attached in parallel in the present invention, and 11 is a solenoid valve attached to one refrigerant pipe of the two evaporators 4. Therefore, in the cold air operation mode, the solenoid valve 11 is closed to send the refrigerant only to one evaporator 4, and in the hot air operation mode, the solenoid valve 11 is opened to send the refrigerant to both evaporators 4. Therefore, the refrigerant is surely vaporized in the evaporator 4 as in the case where the rotation speed of the cold air fan 5 is increased.

Reference numeral 12 is a cold air temperature sensor mounted in the cold air flow passage between the cold air fan 5 and the cold air outlet 7, 13 is an opening / closing damper installed between the cold air temperature sensor 12 and the cold air outlet 7, and 14 is an opening / closing damper 13. Cold wind damper 13 that works with
When the cold air temperature sensor 12 detects a temperature higher than the temperature set in advance by referring to the outside air temperature or the like, the open / close damper 13 is closed, and the cold air damper 13a is opened instead to open the cold air. The cool air of the fan 5 is blown into the room from the cool air escape passage 14. Therefore, it is possible to prevent the trouble of discharging the cool air having a temperature higher than the outside temperature to the outside of the room and preventing the outside air having a temperature lower than that of the discharged cool air from entering the room as draft air and suppressing the rise in room temperature, thereby improving the heating effect.

Reference numeral 15 denotes a bypass passage that branches the warm air passage from the warm air fan 6 toward the warm air outlet 8 and opens at the front face of the evaporator 4, 15a denotes a warm air damper that opens and closes the bypass passage 15, and 16 denotes a room temperature. Alternatively, the temperature sensor 1 is a temperature sensor attached to the hot air flow path to detect the temperature of the hot air.
6 detects the risk of freezing of the evaporator 4 by the room temperature or the temperature of the warm air that has risen from room temperature, and opens the warm air damper 15a before starting the freezing to open a part of the warm air from the bypass passage 15 to the evaporator 4. The evaporator 4 is prevented from being frozen in advance.

The warm air damper 15a may be opened by a signal from the freeze detection sensor of the evaporator 4 instead of the temperature sensor 16. At this time, it takes a considerable time to eliminate the freeze, but the temperature sensor 16 It is better to have a backup.

Reference numeral 23 denotes an electric heater attached to a warm air flow path extending from the warm air fan to the warm air outlet 8, and when the warm air temperature is low, it is energized manually to raise the warm air temperature. Further, it is desirable that the air heated by the electric heater 23 flows as the warm air flowing from the bypass passage 15 toward the evaporator 4.

[0027]

As described above, according to the present invention, the cool air / warm air fan 5, which is set so as to be optimal during the cold air / dehumidifying operation,
Since the rotation speed of No. 6 was changed during the hot air operation, the efficiency of the refrigeration cycle deteriorates, but the temperature rise becomes large, and hot air of high temperature can be obtained even when the room temperature is low.

Further, the higher the temperature of the hot air, the more the load is applied to the compressor 2 and the temperature of the compressor 2 increases, which is advantageous for obtaining the hot air. This may lead to the destruction of the compressor 2, and in the present invention, a safety device for mounting the duct 9 incorrectly is also provided, and the range of use for obtaining warm air using the conventional cold air dehumidifier has expanded.

Further, in order to obtain high-temperature air with the cold air dehumidifier, it is necessary to raise the average room temperature, and indoor exhaust is selected according to the exhaust air temperature to carry out the dehumidifying operation, so that the electricity consumed even when the outside air temperature is low. All of the energy contributes to the rise in room temperature.

Further, when the refrigeration cycle is operated at a low temperature, the evaporator 4 is frozen and it is necessary to stop the operation of the compressor 2 and thaw it. However, in the present invention, a part of warm air is fed to the evaporator 4 at a low temperature. Since it was sent, the evaporator 4 did not freeze even when the room temperature was low, and continuous operation of the refrigeration cycle was possible. Therefore, the hot air does not stop suddenly while the warm air blower is in use, and the usability is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an air conditioner according to the present invention during cold air operation.

FIG. 2 is a cross-sectional view of the air conditioner according to the present invention during warm air operation when the outdoor is extremely cold.

FIG. 3 is a pipeline of the refrigeration cycle of the air conditioner according to the present invention.

[Explanation of symbols]

 1 Frame 2 Compressor 3 Condenser 4 Evaporator 5 Cold Air Fan 6 Hot Air Fan 7 Cold Air Outlet 8 Hot Air Outlet 9 Duct 10 Duct Sensor 11 Solenoid Valve 12 Cold Air Temperature Sensor 13 Open / Close Damper 14 Cold Air Escape Path 15 Bypass Path 16 Temperature Sensor

Claims (4)

[Claims] 1. A compressor 1, a condenser 3, and an evaporator 4 are mounted in a frame body 1 arranged in a room, and indoor air is sucked by cool air / warm air fans 5 and 6 installed in the frame body to obtain cool air. In the cool air dehumidifier that blows out as warm air, the number of rotations of the cold air fan 5 is increased or the number of rotations of the warm air fan 6 is decreased during the operation of the warm air, and the duct 9 connected to the cold air outlet 7 or the hot air outlet 8 is installed. An air conditioner characterized by being provided with a duct sensor 10 attached to the attachment portion of the duct 9, the duct sensor 10 detecting an inadequate attachment position of the duct 9 during warm air operation, and stopping the operation of the compressor 2. 2. The evaporators 4 mounted in the frame 1 are mounted in parallel so that the air flow passes through both evaporators 4 and the refrigerant pipes to the evaporators 4 are connected in parallel, and the refrigerant of one evaporator 4 is connected. The air conditioner according to claim 1, wherein a solenoid valve 11 is attached to the pipe, the solenoid valve 11 is opened during warm air operation, and the refrigerant is supplied to the two evaporators 4. 3. The cold air flow path blown out from the cold air fan 5 includes:
Cold air temperature sensor 12 and open / close damper 13 for cold air outlet 7.
And the cold air escape passage 1 that opens and closes in conjunction with the opening and closing damper 13.
4. When the cold air temperature sensor 12 detects a temperature equal to or higher than a predetermined temperature during warm air operation, the opening / closing damper 13 is closed and the cold air escape passage 14 is opened to switch to indoor exhaust air. Harmony device. 4. A hot air flow path from the hot air fan 6 to the hot air outlet 8 is branched to form a bypass path 15 communicating with the evaporator 4, and a temperature sensor 16 for detecting room temperature or hot air temperature is provided, The air conditioner according to claim 1, wherein when the temperature sensor 16 detects a temperature equal to or lower than a predetermined temperature during the hot air operation, the hot air is supplied from the bypass passage 15 to the evaporator 4.