JPS6027853Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner, and more particularly, to an air conditioner that can take in fresh outside air and ventilate a room.

Conventional air conditioners are known that take in fresh outside air to ventilate the room, but generally, when taking in fresh outside air, the load is 30 to 40% of the full load.
%, and there was a problem of lack of ability.

In addition, in the past, devices have been proposed that effectively utilize the heat exhausted by a total heat exchanger or the like to solve the above-mentioned problems, but the equipment costs are high and the overall thickness of the device is large. There was also the problem that maintenance was troublesome.

The present invention was devised in view of the above-mentioned problems.The purpose of this invention is to introduce fresh outside air into the room without using any special equipment, with a simple structure, and without reducing the cooling capacity. The object of the present invention is to provide an air conditioner that can cool the air.

In other words, the present invention proposes that even if refrigerant is sucked into a screw compressor or rotary compressor during the compression process at an intermediate pressure between low and high pressures, the amount of refrigerant sucked through the suction port decreases, resulting in a decrease in capacity. Focusing on the fact that it has a so-called superfeed effect, which is rare, we used a compressor with a superfeed effect, connected the main first evaporator that cools indoor circulating air to the inlet of the compressor, and A second evaporator is provided outside the first evaporator, and the second evaporator is connected to the intermediate suction port of the compressor, and the second evaporator utilizes the superfeed effect to evaporate indoors. It acts as if it were cooling fresh outside air, which is higher in temperature than the indoor air, so intermediate pressure (superfeed pressure) can be easily obtained without reducing cooling capacity. , the fresh outside air can be cooled.

Embodiments of the device of the present invention will be described below based on the drawings.

Reference numeral 1 designates a screw compressor, which has a main suction port 1a and an intermediate portion that communicates with the intermediate pressure portion during the compression process of the gas refrigerant sucked through the suction port 1a, that is, during the compression process after the suction process has ended. Inlet port 1b and one outlet port 1c
The motor M drives a screw (not shown) built into the compressor housing.
In addition to sucking gas refrigerant through the suction port 1a, additional gas refrigerant is sucked in through the intermediate suction port 1b during the compression process, and after the compression process is completed, high-temperature, high-pressure gas refrigerant is discharged from the discharge port IC. .

Further, 2 is a condenser connected to the discharge port 1c, 3 is a liquid receiver, and this liquid receiver 3 has two first and second liquid pipes 4.
, 5, and among these liquid pipes 4, 5, the first
In the middle of the liquid pipe 4, there is an expansion mechanism 6 that reduces the pressure of the liquid refrigerant to a low pressure.
In addition, an expansion mechanism 7 is interposed in the middle of the second liquid pipe 5 to reduce the pressure of the liquid refrigerant to an intermediate pressure (super feed pressure) higher than the low pressure.

Further, 8 is a main first evaporator, 9 is a second evaporator,
Both of these evaporators 8 and 9 are air heat exchangers, and are arranged in a casing 11 together with an indoor circulation fan 10.

That is, an air outlet 11a that communicates with the chamber R is provided on the front surface of the casing 11, and an inlet 11b that communicates with the chamber R is provided in the middle of the side surface of the casing 11 in the front-rear direction. A circulation passage 12 leading to the suction port 11b is formed through the circulation passage 12, and indoor air is circulated through this circulation passage 12.
The evaporator 8 is disposed, and the casing 11 is
An outside air intake port 11c is provided on the rear surface, and this intake port 11c
An outside air intake pipe 13a is connected to the outside air intake pipe 13a, and an outside air intake passage 13 is formed which runs from this outside air introduction pipe 13a through the outside air intake port 11c and then to the circulation passage 12.
Specifically, the second evaporator 9 is disposed between the outside air intake port 11c and the suction port 11b.

Therefore, the first and second evaporators 8 provided as above,
Among the refrigerant inlets of the first evaporator 9, the first liquid pipe 4 is connected, and the refrigerant outlet is connected to the suction port 1a of the compressor 1. The second liquid pipe 5 is connected to the refrigerant inlet of the compressor 1, and the refrigerant outlet is brought into contact with the intermediate suction port 1b of the compressor 1, respectively.

In the above configuration, by driving the compressor 1, the gas refrigerant discharged from the discharge port IC is condensed in the condenser 2, and the condensed liquid refrigerant is transferred from the liquid receiver 3 to the two first The liquid is divided into the first and second evaporators 8 and 9 via the second liquid pipes 4 and 5.

The liquid refrigerant flowing into the first evaporator 8 exchanges heat with the indoor circulation air passing through the circulation passage 12 and evaporates at a low evaporation pressure of F-A shown in the Mollier diagram in FIG. The liquid refrigerant that is pre-cooled by the air and the second evaporator and returns to the suction port 1a of the compressor 1 and flows into the second evaporator 9 exchanges heat with the outside air that passes through the outside air intake passage 13. , the high evaporation pressure of E-B shown in the Mollier diagram in Figure 2 (
The outside air is evaporated at an intermediate pressure), cooled (precooled), and returned to the intermediate suction port 1b of the compressor 1.

In the above cycle, since the temperature of the outside air is higher than the temperature of the indoor circulating air, an intermediate pressure can be easily obtained, and the gas refrigerant that evaporates at this intermediate pressure is transferred to the compressor.
Even if the gas refrigerant is additionally sucked into the intermediate suction port 1b of the compressor 1, the amount of gas refrigerant evaporated at low pressure in the first evaporator 8 and sucked into the suction port 1a does not decrease. By effectively utilizing the superfeed effect,
The outside air can be cooled without reducing the cooling capacity.

In the Mollier diagram in FIG. 2, A is the main suction point in the compressor 1, B is the intermediate suction point, C is the discharge point, A to C are the compression process, C is the condensation process, D-F
is the expansion process of the expansion mechanism 6, D-E is the expansion process of the expansion mechanism 7, F-A is the evaporation process of the first evaporator 8, and F-B is the second
This is the evaporation process of the evaporator 9.

Further, in FIG. 1, 12a is a blow-off duct connected to the blow-off port 11a, and 12b is a suction duct connected to the suction port 11b.These ducts 12a and 12b form the circulation passage 12.

Further, 14 is an indoor air exhaust pipe connected to the suction duct 12b, 15 is an exhaust fan, and 16 is the exhaust pipe 14.
17 is a damper for adjusting the amount of outside air intake provided in the outside air introduction pipe 13a,
These dampers 16 and 17 are driven, for example, by a motor, and are synchronously controlled so that they have the same opening amount.

Further, 18 is a check valve. Also, in the drawing, the first and second evaporators 8 and 9 are arranged in one casing 11, but the first evaporator 8 is located in the circulation passage 1 for indoor circulating air.
2, the second evaporator 9 may be placed in the outside air intake passage 13 that takes in fresh outside air into the room, or may be installed in independent gauging units.

Further, the circulation passage 12 is constructed by connecting a blow-off duct 12a to the blow-off port 11a and a suction duct 12b to the suction port 11b. The suction port 11b may be opened directly into the chamber R.

In addition, when the suction duct 12b is provided, the exhaust pipe 14 for indoor air is connected to the suction duct 12b, but when the suction duct 12b is not provided, an exhaust port is provided in the room R or the exhaust pipe 14 is connected to the suction duct 12b. The casing 11 is provided with an exhaust pipe.

As described above, according to the present invention, by utilizing the superfeed effect of a compressor that has a superfeed effect, fresh outside air taken into a room can be cooled without reducing the cooling capacity. Ventilation can be performed with a simple structure without insufficient capacity, without increasing the equipment cost, and can be done at low cost, and the entire device can be made compact and maintenance is easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a Mollier diagram. 1...Compressor, 1a...Suction port, 1b
...Intermediate suction port, 1c...Discharge port, 2
...Condenser, 8...First evaporator, 9.
...Second evaporator, 12...Circulation passage, 1
3...Outside air intake passage

Claims (1)

[Scope of utility model registration request] Equipped with a compressor and a condenser having a superfeed effect, and two first and second evaporators, these evaporators are used as air heat exchangers, and the first evaporator is used as a circulation path for indoor circulating air.
Further, the second evaporators are arranged in respective outside air intake passages that introduce fresh outside air into the room, and the outside air intake passages are communicated with the air inlet side of the first evaporator in the circulation passage, while the An air conditioner characterized in that an intermediate suction port is provided in the middle of a compression process of the compressor, and the first evaporator is connected to the suction port of the compressor, and the second evaporator is connected to the intermediate suction port.