JPS6141387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner equipped with a variable capacity compressor.

Conventionally, in an air conditioner in which multiple indoor units are connected to one outdoor unit, an opening is provided in the middle of the compressor cylinder, and this opening is connected to the suction side of the compressor through a bypass pipe. In some cases, a pressure introduction pipe for controlling refrigerant is provided to a control valve that opens and closes this opening, and a solenoid valve provided in the middle of the pressure introduction pipe is controlled depending on the number of operating indoor units.

However, in this case, the solenoid valve is usually a three-way valve, and high-pressure gas is applied to the control valve to close the opening, and high-pressure gas applied to the control valve is released to the low-pressure side to open the opening. It required work and was structurally complex.

The present invention solves the above-mentioned drawbacks, has a simple structure,
The capacity of the compressor is controlled, depending on the air conditioning load.
To provide an air conditioner that can have an optimal capacity.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an outdoor unit, and an indoor unit A2 and an indoor unit B3 are connected in parallel to the outdoor unit 1 by high pressure pipes 4 and 5 and low pressure pipes 6 and 7. A compressor 8 has a rotor 10 rotating eccentrically with respect to the center of the cylinder 9. 11 is cylinder 9
This is a gate valve that separates a high pressure chamber and a low pressure chamber, and is pressed against the rotor 10 by a spring 12.
A suction pipe 13 communicates with the inside of the cylinder 9, and is connected to the low pressure pipes 6 and 7. Reference numeral 14 denotes a discharge pipe for discharging compressed refrigerant gas, which is connected to a condenser 15 and from there to high-pressure pipes 4 and 5. 16 is an opening provided in the cylinder 9, through which the suction pipe 13 is connected via the cylindrical part 17 and the bypass pipe 18.
is connected to. Reference numeral 19 denotes a plunger that opens and closes the opening 16, and is provided within the cylindrical portion 17, and a force is applied by a spring 20 in the direction of opening the opening. 21 is a pressure introduction pipe, one end of which is connected to the plunger 19.
It is connected to the cylindrical part 17 so that pressure is applied to the back surface of the cylindrical part 17. Next, the indoor units A2 and B3 are connected to the low pressure pipes 4 and 5, as well as electromagnetic valves 22 and 23, pressure reducers 24 and 25, and evaporators 26 and 27, respectively. Note that the capacity of the evaporator 26 is about 1.5 times larger than that of the evaporator 27. In addition, the pressure introduction pipe 2
The other end of the valve 1 is connected between the solenoid valve 22 and the pressure reducer 24 . Note that this pressure introduction pipe 21 may be a relatively thin pipe.

Figures 2 and 3 are enlarged diagrams of the broken line circles in Figure 1.
Parts that are the same as those in the figure are given the same numbers.

Next, the operation of the present invention with the above configuration will be explained. First, only indoor unit A2 is operated, and solenoid valve 2
Consider the case where only 2 is open. Discharge pipe 1
The high-pressure refrigerant gas discharged from 4 is liquefied in the condenser 15, passes through the high-pressure piping 4 and the solenoid valve 22, and is sent to the pressure reducer 2.
4, the gas becomes low pressure in the evaporator 26, passes through the low pressure pipe 6, and returns to the suction pipe 13 again. At this time, if the air that has undergone heat exchange with the evaporator 26 is sent to the air-conditioned room A, cooling can be achieved. Also, at this time, since the pressure introduction pipe 21 is connected between the solenoid valve 22 and the pressure reducer 24, high pressure is applied to the back of the plunger 19, and the opening 16 is closed, as shown in FIG. . Therefore, all the refrigerant gas sucked into the cylinder 9 from the suction pipe 13 is discharged from the discharge pipe 14, so that the compressor 8 achieves its maximum capacity and the air-conditioned room A, which has a large cooling load, is sufficiently cooled. It turns out.

Next, when the solenoid valves 22 and 23 are opened at the same time, the opening 16 is closed and the compressor 8 produces its maximum capacity, similar to when only the solenoid valve 22 is opened.

Next, consider a case where only the solenoid valve 23 is open. The air-conditioned room B in which the indoor unit B3 is installed has a smaller cooling load than the air-conditioned room A. Therefore,
The compressor 8 may have a small capacity. At this time, since the solenoid valve 22 is closed, the pressure from the solenoid valve 22 to the low pressure pipe 6 is all low. Therefore, even if there is high-pressure refrigerant in the pressure introduction pipe 21, it escapes to the low-pressure side, and high pressure is not applied to the back surface of the plunger 19. Therefore, as shown in FIG. 3, the opening 16 is opened and a part of the refrigerant sucked into the cylinder 9 from the suction pipe 13 passes through the opening 16, the cylindrical part 17, the bypass pipe 18, and enters the suction pipe 13. bypassed,
The remaining refrigerant is discharged from the discharge pipe 14. Therefore, the amount of refrigerant circulation is suitable for the small capacity evaporator 27, and the air-conditioned room B with a small cooling load is appropriately cooled.

In this embodiment, the bypass pipe 18 is provided, but the present invention is not limited to this. When the opening 16 is opened, the refrigerant flowing out from the cylinder 9 through the opening 16 is transferred to the side surface of the plunger 19. It may also be bypassed to the suction pipe 13 through the pressure introduction pipe 21 through the gap between the inner wall of the cylindrical part 17, the pressure reducer 24, the evaporator 26, and the low-pressure pipe 6.

Additionally, a capillary tube may be provided in the middle of the pressure introduction pipe 21, or the middle of the pressure introduction pipe 21 may be overheated by the high temperature section of the refrigeration cycle. Less is enough.

In the above embodiment, two chambers were used, but more than two chambers may be used.

As described above, according to the present invention, a refrigeration cycle is configured by sequentially connecting a plurality of parallel circuits each including a solenoid valve, a pressure reducer, and an evaporator connected in series to a compressor and a condenser, and An opening provided in a part of the cylinder and communicating with the low pressure side of the refrigeration cycle, an opening/closing device for opening and closing this opening, and a pressure introduction pipe for introducing refrigerant gas acting on this opening/closing device are provided. Since the other end of the pipe is connected between one of the solenoid valves in the plurality of parallel circuits and the pressure reducer, the capacity of the compressor can be changed depending on the capacity or number of evaporators used, and Since the high pressure or low pressure within the pressure introduction pipe is controlled using the opening and closing of the electromagnetic valves that control refrigerant to each evaporator, there is no need to provide a separate control valve in the middle of the pressure introduction pipe.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention, and Figs.
FIG. 2 is an enlarged sectional view within a broken line circle in the figure. 8...Compressor, 9...Cylinder, 13...Suction pipe, 14...Discharge pipe, 15...Condenser, 16...
Opening, 19...plunger, 21...pressure introduction pipe, 22, 23...electromagnetic valve, 24, 25...pressure reducer, 26, 27...evaporator.

Claims (1)

[Claims] 1 A refrigeration cycle is constructed by connecting a plurality of parallel circuits in which a solenoid valve, a pressure reducer, and an evaporator are connected in series to a compressor and a condenser, and a refrigeration cycle is constructed by connecting a plurality of parallel circuits in which a solenoid valve, a pressure reducer, and an evaporator are connected in series. An opening that communicates with the low pressure side of the cycle, a switch that opens and closes this opening, and a pressure introduction section that introduces refrigerant gas that acts on this switch are provided, and the other end of this pressure introduction pipe is connected to the plurality of parallel pipes. An air conditioner characterized in that the air conditioner is connected between one solenoid valve in a circuit and a pressure reducer.