JPH08200903A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE: To enable the continuation of operation with a high efficiency with a limited load of a compressor even in the dehumidifying operation liable to cause poor heat exchange of an evaporator for an air conditioning apparatus using a refrigerating circuit. CONSTITUTION: A refrigerant pipe 6 with a radiation fin 2a in common is mounted on a condenser 2 of air conditioning equipment, the outlet side of an evaporator 4 is connected to an inlet of the refrigerant pipe 6 while an outlet of the refrigerant pipe 6 is connected to an inlet of a compressor 1. In dehumidification, a liquid refrigerant delivered from the evaporator 4 promotes the radiation of heat of the condenser 2 to reduce the load of the compressor 1 while the refrigerant gasified is sent to the compressor 1 thereby preventing a trouble of the compressor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner which reduces the load on a compressor and improves the efficiency of a refrigeration circuit during dehumidifying operation.

[0002]

2. Description of the Related Art A high-temperature and high-pressure refrigerant pressurized by a compressor is sent to a condenser, the condenser is cooled by outdoor air to liquefy the refrigerant, and the refrigerant is sent to an evaporator through a capillary to be vaporized. The evaporator is cooled to a low temperature by the heat of vaporization of the refrigerant, and the indoor air is sent to the evaporator to obtain low-temperature air to cool the room. Then, the refrigerant vaporized by the evaporator is sent to the compressor, again pressurized to high temperature and high pressure, and circulated.

[0003]

By the way, the refrigerant vaporized by the evaporator cannot be vaporized only by the evaporator if it is used when the indoor air temperature is lowered during the dehumidifying operation, etc. May be vaporized.

For this reason, an accumulator is attached to the inlet of the compressor so that only the vaporized refrigerant is sent to the compressor. If the refrigerant compresses the liquid, the compressor is subjected to an extremely large load, It was causing trouble.

In addition, a large accumulator is required to reliably send only the refrigerant gas to the compressor.
The cooling capacity that I still had when I left the evaporator
It meant discarding until the inlet of the compressor and could not avoid efficiency reduction.

[0006]

According to the present invention, a pipe of a connecting pipe through which a refrigerant flows is specified for efficient operation, and a compressor 1, a condenser 2, a capillary 3, and an evaporator 4 are connected by a connecting pipe 5. A refrigerating circuit is provided, a refrigerant pipe 6 having a common radiating fin 2a is attached to the condenser 2, and the refrigerant pipe 6 is connected in the middle of a connecting pipe 5 that connects the evaporator 4 and the compressor 1.

Further, a temperature sensor 7 is attached to the evaporator 4 or a connecting pipe 5 on the outlet side of the evaporator 4, and a heat radiating fin 2a is provided in parallel with a common refrigerant pipe 6 to provide a bypass pipe 8, and a solenoid valve is provided in the bypass pipe 8. 9 is attached, and when the temperature sensor 7 detects a low temperature, the electromagnetic valve 9 is closed to return the refrigerant to the compressor 1 via the condenser 2.

[0008]

When the refrigerant compressed by the compressor 1 and radiated by heat radiation is sent to the evaporator 4 through the capillary 3,
Since the capillaries 3 are set for the normal cooling operation, the evaporator 4 freezes or the evaporator 4 freezes when the indoor air temperature decreases under the operating conditions such as low temperature inside the room and dehumidifying operation.
It sometimes happens that the refrigerant is discharged as a liquid to the connecting pipe 5.

The capacitor 2 of the present invention includes a radiation fin 2
Since the refrigerant pipe 6 having a common a is attached and the refrigerant discharged from the evaporator 4 returns to the compressor 1 via the refrigerant pipe 6 of the condenser 2, even the liquid-mixed refrigerant is surely in a gaseous state, and the abnormal operation of the compressor 1 Could be prevented.

Since the temperature of the refrigerant passing through the refrigerant pipe 6 is low with respect to the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1, the refrigerant has a function of cooling the high-temperature and high-pressure refrigerant through the radiation fins 2a. As in the case of combining with a large condenser or sprinkling water on the condenser, the cooling capacity is improved and the compressor 1 can be operated at a low load.

Further, when a high temperature gaseous refrigerant is discharged from the evaporator 4 as in the summer cooling operation,
When passing through the refrigerant pipe 6 of the compressor 1, the temperature becomes even higher, and the compressor 1 that compresses a high temperature refrigerant operates under high load. However, the bypass pipe 8 and the solenoid valve 9 work, so that the refrigerant temperature is high. Can directly send the refrigerant to the compressor 1 via the bypass pipe 8, and the compressor 1
No abnormalities occur.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a compressor, 2 is a compressor 1
A condenser to which the high-temperature and high-pressure refrigerant compressed by 4 is sent.
Is an evaporator to which the refrigerant liquefied by the condenser 2 is sent, and the compressor 1, the condenser 2, and the evaporator 4 are connected by a connecting pipe 5 so that the refrigerant circulates.

Reference numeral 3 denotes a capillary attached to a connecting pipe 5 for connecting the condenser 2 and the evaporator 4. The capacity of the capillary 3 is determined in accordance with the heat exchange capacity of the evaporator 4, so that the evaporator 4 can be cooled efficiently. Is set to.

Reference numeral 10 denotes an accumulator mounted close to the compressor 1. The accumulator 10 separates the refrigerant flowing through the connecting pipe 5 toward the compressor 1 into a liquid and a gas, and only the gas is sent to the compressor 1. I am allowed to do so.

Reference numeral 11 denotes a propeller-type blower for air-cooling the condenser 2, and reference numeral 12 denotes an indoor unit mounted on a wall in the room separated from an outdoor unit in which the compressor 1 and the condenser 2 are installed. A line flow fan 13 is installed therein, and a discharge port 14 at which a cooling air passing through the evaporator 4 blows out at a lower part of the indoor unit 12.
Is formed.

The above-described structure is a cooler using a general refrigeration circuit, and the cooler also functions as a dehumidifier for liquefying and discharging water vapor in the air when the evaporator 4 cools the air. In addition, the use as a dehumidifier is often used during the rainy season rather than during the summer, and since the room temperature is low at this time, the liquid refrigerant that has passed through the capillary 3 is
In the evaporator 4, everything is vaporized and becomes a gas body so that it cannot go to the compressor 1 and is sent to the compressor 1 in a liquid state.

Further, in this state, the liquefied water vapor on the surface of the evaporator 4 adheres as ice, and the heat exchange of the evaporator 4 is hindered by the ice, and the compressor 1
The amount of liquid refrigerant sent to the
If the compressor 1 sucks the refrigerant in the liquid state, the compressor 1 may be destroyed in the worst case.

In the present invention, the compressor 1 is prevented from being broken, 2a is a heat radiation fin of the condenser 2, 6 is a refrigerant pipe attached to the condenser 2 which shares the heat radiation fin 2a, and is connected to the outlet side of the evaporator 4. The pipe 5 is connected to the refrigerant pipe 6, and the other side of the refrigerant pipe 6 is connected to the compressor 1 via the accumulator 10.

As when the room temperature drops during dehumidification operation,
The liquid refrigerant discharged from the evaporator 4 completely becomes a gas in the refrigerant pipe 6 of the condenser 2 in which the high-temperature and high-pressure refrigerant gas of the compressor 1 flows, and is then sent to the compressor 1, so that the liquid compression of the compressor 1 is completely eliminated.
Stable operation became possible.

Further, since the refrigerant sent from the evaporator 4 has a lower temperature than the high temperature / high pressure refrigerant discharged from the compressor 1, the high temperature / high pressure refrigerant is efficiently cooled and the condenser 2 is cooled by water. The load on the compressor 1 is reduced in the same manner as when the pressure is applied or the shape is increased, and energy saving operation becomes possible. Further, if the evaporator 4 freezes and the amount of heat exchange by the evaporator 4 decreases, the amount of liquid refrigerant sent to the refrigerant pipe 6 increases, so the load on the compressor 1 further decreases, and energy loss decreases. is there.

On the other hand, corresponding to the cooling operation in summer, 7 is a temperature sensor attached to the evaporator 4 or the connection pipe 5 on the outlet side of the evaporator 4, 8 is a bypass pipe connected in parallel with the refrigerant pipe 6, and 9 is a bypass pipe. When the temperature sensor 7 is at a high temperature and the refrigerant is assumed to be completely gaseous, the electromagnetic valve 9 is opened and the refrigerant is sent directly to the compressor 1. By setting the state, troubles of the compressor 1 are prevented.

[0022]

As described above, according to the present invention, the capacitor 2
Since the heat dissipation fin 2a is provided with the common refrigerant pipe 6, even if the liquid refrigerant is discharged from the evaporator 4 as in the dehumidifying operation, the energy remaining in this refrigerant is recovered by the condenser 2. The compressor 1 is operated under a low load, and the efficiency of the refrigeration circuit is improved.

If the temperature of the refrigerant on the suction side of the compressor 1 is too high, the compressor 1 will be too hot and an emergency stop will occur. In this invention, the connection pipe 5 on the outlet side of the evaporator 4 is connected to the compressor 1 by the signal of the temperature sensor 7 for detecting the refrigerant temperature, so that it becomes the same as the conventional refrigeration circuit and the abnormal operation of the compressor 1 can be prevented. Is.

[Brief description of drawings]

FIG. 1 is a refrigeration circuit showing an embodiment of the present invention.

[Explanation of symbols]

 1 Compressor 2 Condenser 2a Radiating fin 3 Capillary 4 Evaporator 5 Connection pipe 6 Refrigerant pipe 7 Temperature sensor 8 Bypass pipe 9 Solenoid valve

Claims (2)

[Claims] 1. A refrigeration circuit for connecting a compressor 1, a condenser 2, a capillary 3 and an evaporator 4 with a connecting pipe 5 is provided, and a refrigerant pipe 6 having a radiating fin 2a in common is attached to the condenser 2, and the evaporator 4 and the compressor 1 are connected.
An air conditioner characterized in that a refrigerant pipe 6 is interposed in the middle of a connecting pipe 5 for connecting with. 2. The evaporator 4 or the evaporator 4
The temperature sensor 7 is attached to the connection pipe 5 on the outlet side, the heat radiation fin 2a is provided in parallel with the common refrigerant pipe 6, the bypass pipe 8 is provided, and the solenoid valve 9 is attached to the bypass pipe 8 to detect the low temperature. The electromagnetic valve 9 is sometimes closed.
The air conditioner described.