JPS6038846Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacity control variable capacity air conditioner in which the cooling capacity can be changed with one two-way return.

As shown in FIG. 1, a conventional capacity-controlled variable capacity air conditioner has a compressor 1, a condenser 2, a primary capillary 3, a gas-liquid separator 4, a secondary capillary 5, and an evaporator 6 connected in series. The gas injection port of the compressor 1 and the gas outlet of the gas-liquid separator 4 are connected by a gas injection pipe 8 with a three-way valve 7 interposed therebetween, and a save pipe 10 with a two-way valve 9 interposed therebetween. A refrigeration cycle in which a portion of a gas injection pipe 8 on the compressor 1 side and an inlet side of the compressor 1 are connected is known.

According to this, the two-way valve 7 of the gas injection pipe 8
When the two-way valve 9 of the save pipe 10 is opened and the two-way valve 9 of the save pipe 10 is closed, the gaseous part of the refrigerant separated by the gas-liquid separator 4 enters the gas injection port provided in the middle of compression of the cylinder of the compressor 1. Because the air is guided, the cooling capacity is increased.

Conversely, when the two-way valve 9 of the save pipe 10 is opened and the two-way valve 7 of the gas injection pipe 8 is closed, a part of the refrigerant that is being compressed by the compressor 1 passes through the save pipe 10. Since the air returns to the suction side of the compressor 1, the cooling capacity decreases.

Therefore, the cooling capacity can be changed by opening and closing these two-way valves 7 and 9.

However, since two two-way valves 7 and 9 are used, the operation becomes cumbersome.

In the case where each two-way valve 7゜9 is a solenoid valve, even if the energization method is changed, input to each two-way valve 7, 9 is required, resulting in a high EER (here, EER is EnergyEffi).
It is an abbreviation for science ratio.

), the inputs from the two-way valves 7 and 9 are becoming a force that cannot be ignored.

Furthermore, the two two-way valves 7 and 9 also lead to increased costs.

Therefore, as shown in FIG. 2, it may be considered to remove the three-way valve 7 of the gas injection pipe 8.

However, in this case, when the two-way valve 9 is closed, the operation can be performed at a high cooling capacity, but when the three-way valve 9 of the save pipe 10 is opened, most of the refrigerant coming out of the discharge port of the compressor 1 is transferred to the condenser 2.
, the primary capillary 3, the gas-liquid separator 4, the gas injection pipe 8, the save pipe 10, and the two-way valve 9 before returning to the inlet of the compressor 1, so the evaporator 6 hardly absorbs heat. It can no longer be called cooling operation.

Therefore, even if there is only one two-way valve 9, it is useless as a variable cooling capacity air conditioner in a refrigeration cycle as shown in FIG.

The present invention was developed in view of the above-mentioned problems and to effectively solve them, and its purpose is to:
To provide an air conditioner which can change cooling capacity while maintaining IER during gas injection with one two-way valve, and can promote simplification of structure and cost reduction.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, 1 is a compressor, and a condenser 2, a primary capillary 3, a gas-liquid separator 4, a secondary capillary 5, and an evaporator 6 are connected in series on the discharge port side of the compressor.
The outlet side of the evaporator 6 is connected to the inlet side of the compressor 1, forming a refrigerant circuit.

The gas injection port provided in the middle of compression of the cylinder of the compressor 1 and the gas outlet of the gas-liquid separator 4 are connected by a gas injection pipe 8, and the refrigerant that has not been liquefied is transferred to the compressor 1 on the way. By returning the air conditioner, the cooling capacity can be increased.

In order to increase the cooling capacity to some extent, a save pipe 12 for bypassing the refrigerant flowing from the gas-liquid separator 4 to the secondary capillary 5 to the evaporator is connected almost in parallel to the secondary capillary 5. A two-way valve 11 for opening and closing this passage is interposed in this save pipe 12.

That is, one end of the save pipe 12 is connected to the gas injection pipe 8, and the other end is connected to the pipe 13 that connects the secondary capillary 5 and the evaporator 6, thereby forming a bypass for the secondary capillary 5. .

Next, the operation of the present invention will be described.

First, when increasing the cooling capacity, the three-way valve 11 is closed.

When the two-way valve 11 is closed, there is no bypass of the refrigerant to the secondary capillary 5, so the liquid portion of the refrigerant flows from the gas-liquid separator 4 into the secondary capillary 5 and flows out to the evaporator 6, resulting in high cooling capacity. .

At the same time, the gaseous part of the refrigerant separated by the gas-liquid separator 4 passes through the gas injection pipe 8, flows into the gas injection port of the compressor 1, and is discharged from the compressor 1 again. The amount of liquid refrigerant flowing in increases, further increasing the cooling capacity.

At this time, since no particular valve is provided in the gas injection pipe 8, there is little fluid resistance, and therefore the gas injection action can be made more effective.

Next, when lowering the cooling capacity, the two-way valve 11 is opened.

When the two-way valve 11 is opened, the save pipe 12 connects the gas outlet of the gas-liquid separator 4 and the inlet of the evaporator 6, so the flow of refrigerant to the secondary capillary 5 is bypassed and the compressor 1 flows into the evaporator 6 via the condenser 2, the primary capillary 3, the gas-liquid separator 4, and the three-way valve 11, and a part of the discharged refrigerant passes through the secondary capillary 5 and flows into the evaporator 6. Inflow.

Further, a part of the refrigerant that is being compressed flows from the gas injection port of the compressor 1 into the evaporator 6 via the gas injection pipe 8, the save pipe 12, and the two-way valve 11.

Therefore, most of the refrigerant flowing into the evaporator 6 does not pass through the secondary capillary 5, and since some of the refrigerant is still being compressed from the gas injection port of the compressor 1, the evaporator 6 absorbs heat. The effect becomes lower.

In this case, the input to the compressor 1 increases by the amount that the pressure at the injection port increases slightly, but almost no refrigerant flows into the secondary capillary 5, and the overall amount of fringing becomes almost equal to that in the primary capillary 3. Since the discharge pressure of the compressor 1 decreases, the increase is canceled out.

Therefore, no extra input is required when saving.

In addition, in terms of cooling capacity, if you aim to increase the EER, there will be too much heat when saving, and depending on the conditions, the super heat will increase, and the cooling capacity will decrease, but this will be resolved by loosening the heat. .

This is the compressor 1, gas injection pipe 8, save pipe 12, two-way valve 11, and evaporator 6 when saving.
This counteracts the decrease in cooling capacity due to refrigerant flow.

By repeating the above operations, the cooling capacity can be increased or decreased with one three-way valve 11.

In the above embodiment, the case where one end of the save pipe 12 was connected to the gas injection pipe 8 was explained.
The present invention also includes a case where one end of the save pipe 12 is connected to the liquid outlet of the gas-liquid separator 4 as shown in FIG.

In this case, when the two-way valve 11 of the save pipe 12 is opened, the liquid refrigerant in the gas-liquid separator 4 passes through the save pipe 12 and the two-way valve 11 to the evaporator 6 without passing through the secondary capillary 5.
flows into.

At this time, the pressure inside the gas-liquid separator 4 decreases, so a part of the refrigerant that is being compressed flows into the gas-liquid separator 4 from the gas injection port of the compressor 1 via the gas injection pipe 8. The refrigerant in the gas-liquid separator 4 will be heated.

Therefore, since the temperature of the refrigerant flowing into the evaporator 6 becomes high in the safe state, the heat absorption effect of the evaporator 6 becomes low.

Although the cooling capacity can be lowered in this way, other effects are the same as in the previous embodiment.

As is clear from the above explanation, the present invention provides the following effects.

(1) Since only one two-way valve can be used, the structure is simple and the operation thereof is also easy.

Therefore, the two-way valve operating circuit can also be simplified.

(2) Even if there is only one two-way valve, the cooling capacity is not impaired, and the input can be improved by about the same as the two-way valve input (7 to 8 W).

(3) Since there is only one two-way valve, significant cost reductions are possible.

(4) Since there is no need to connect the save pipe to the short section of the inflow pipe of the evaporator compressor, this product has excellent effects such as being particularly useful for window-type air conditioners with particularly short pipes. be.

[Brief explanation of drawings]

Fig. 1 is a piping diagram showing an example of a conventional air conditioner, Fig. 2 is a piping diagram showing another example of a conventional air conditioner, and Fig. 3 is an example of an air conditioner according to the present invention. FIG. 4 is a piping diagram showing another embodiment of the air conditioner according to the present invention. In the figure, 1 is a compressor, 2 is a condenser, 3 is a primary capillary, 4 is a gas-liquid separator, 5 is a secondary capillary, 6 is an evaporator, 8 is a gas injection pipe, 11 is a two-way valve, and 12 is a saver 13 is a pipe.

Claims (4)

[Scope of utility model registration request] (1) In an air conditioner in which a compressor, a condenser, a primary capillary, a gas-liquid separator, a secondary capillary, and an evaporator are connected in series, the gas injection port of the compressor and the gas outlet of the gas-liquid separator are connected for gas injection. 1. An air conditioner characterized in that an air conditioner is provided with a saving pipe that is connected to the secondary capillary by a saving pipe and bypasses the refrigerant flowing from the gas-liquid separator to the secondary capillary to the evaporator. (2) Claim 1 of the above-mentioned utility model registration, characterized in that the above-mentioned saving pipe has a three-way valve for opening and closing its passage.
Air conditioner as described in section. (3) The above-mentioned utility model registration claim is characterized in that the save pipe is configured such that one end thereof is connected to a gas injection pipe and the other end is connected to a pipe connecting a secondary capillary and an evaporator. Range 1 or 2
Air conditioner as described in section. (4) The above-mentioned practical use characterized in that the save pipe is configured such that one end thereof is connected to the liquid outlet of the gas-liquid separator and the other end is connected to a pipe connecting the secondary capillary and the evaporator. An air conditioner according to claim 1 or 2 of the patent registration claim.