JPH0544582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat pump device that uses a non-azeotropic mixed refrigerant and is capable of changing the composition of the refrigerant flowing through a main circuit using a refrigerant rectifier to generate a capacity that is adapted to the load. It is.

BACKGROUND ART In recent years, heat pump refrigeration devices that use non-azeotropic mixed refrigerants and whose capacity can be varied have been developed.

FIG. 3 is a configuration diagram showing a conventional example of a heat pump device. In FIG. 3, during heating, refrigerant vapor compressed by the compressor 1 passes through the four-way valve 2, flows in the direction of the solid arrow, and is condensed and liquefied in the load-side heat exchanger 3.
It enters the squeezing device 4.

During normal operation, the three-way valve 9 is open in the direction shown in FIG.
After entering the heat source side heat exchanger 8 and being vaporized, it returns to the compressor 1.

Next, when changing the refrigerant composition in the main circuit, the three-way valve 9 is rotated 90 degrees to the right, and the refrigerant exiting the expansion device 4 is introduced into the refrigerant rectification column 10 through the three-way valve 9. To make it rich in low-boiling components, close stop valves 14 and 18, and close stop valves 13 and 17.
Let's open. That is, the refrigerant that has passed through the stop pulp 17 is introduced into the top section 10a of the refrigerant rectification column 10, and the refrigerant liquid flows downward through the refrigerant rectification column 10, is heated in the heating section 12 and boils, and the generated gas The components rise in the refrigerant rectification column 10, are newly introduced into the column top 10a, and come into gas-liquid contact with the descending refrigerant liquid.

In this case, the refrigerant introduced into the top section 10a of the refrigerant rectification column 10 exchanges heat and material with the gas generated from the heating section 12, and the low boiling point components are gradually vaporized.
It flows to the heat source side heat exchanger 8.

Next, in order to enrich the main circuit with higher boiling point components, the stop pulps 13 and 17 are closed and the
4.18 is opened. That is, the refrigerant that has passed through the stop pulp 18 is introduced into the bottom section 10b of the refrigerant rectification column 10, heated in the heating section 12, and boiled.
The generated gas components rise within the refrigerant rectification tower 10 and are cooled and liquefied in the cooling section 11. This liquefied refrigerant further descends in the refrigerant rectification column 10,
A so-called rectification effect is performed in which heat and substances are exchanged with the gas newly generated from the heating section 12, and low boiling point components thereof are vaporized and stored in the cooling section 11.

Problems to be Solved by the Invention However, in the above configuration, not only is the circuit extremely complicated, but also the amount of heat from the heating section 12 heats the refrigerant in the main circuit and may be discharged from the load-side heat exchanger 3 during cooling. I had a problem that caused me to lose my ability.

In view of the above problems, the present invention focuses on separating the composition of a non-azeotropic mixed refrigerant so that the main circuit is enriched with high boiling point components, and has a capacity control system that eliminates circuit complexity and capacity loss. This is to provide an air conditioner that is possible.

Means for Solving the Problems In order to solve the above problems, the heat pump device of the present invention uses a non-azeotropic mixed refrigerant, a compressor,
A four-way valve, a condenser, a main circuit pressure reducing device, and an evaporator are connected in sequence to constitute a main circuit of a refrigeration cycle, and a cooler is provided between the suction side of the compressor and the four-way valve,
introducing a portion of the liquid refrigerant liquefied in the condenser from between the condenser and the main circuit pressure reducing device;
By reducing the pressure of the refrigerant through a pressure reducer and making the refrigerant coexist in gas and liquid phases, the filler for the purpose of rectification is enclosed and introduced from the lower part of the rectification column. The refrigerant rich in low-boiling components that has become a gas phase rises in the rectification tower and is introduced into the cooler installed at the top of the rectification tower, where the gas-phase refrigerant is liquefied and further contains low-boiling components for cooling. A large amount of refrigerant is stored. The liquid phase rich in high-boiling components is introduced from the vicinity of the bottom of the rectification column into the bottom of the rectification column between the main circuit throttling device and the evaporator, and a pressure reducing device is used to adjust and stabilize the pressure. and connect them. The rectification circuit described above makes the main circuit a cycle rich in high-boiling components. Furthermore, since the pressure reducer, which determines the gas phase and liquid phase states at the bottom of the rectification column, is fixed, the condenser is on the user side when the refrigerant liquefied in the condenser is supercooled, for example during heating. When used as a heat exchanger and the temperature difference between the condenser and the air on the user side is large and a large amount of heating capacity is required, the state of the refrigerant flowing into the bottom of the rectification column is made into a liquid phase refrigerant. A refrigerant rich in low boiling point components flows into the main circuit without storing low boiling point components to form a circuit.

Effects The present invention has the above-described configuration, and by separating the low boiling point refrigerant component of the non-azeotropic mixed refrigerant according to the load during heating, and changing the refrigeration mixing ratio on the main circuit side, a wide range of efficient capacity control operations can be performed. can be made possible.

Embodiment Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram of the present invention. A compressor 11, a four-way valve 12, a condenser 15, a main circuit pressure reducing device 14, and an evaporator 13 are connected in series. A pressure reducer 17 is connected between the condenser 15 and the main circuit pressure reduction device 14, and a compressor 11 and a four-way valve 1 are connected to the top of the rectification column 16, which is connected to the bottom of the rectification column 16.
A cooler 19 is disposed to penetrate between the two. This cooler 19 is connected to the top of the rectification column 16 and also serves as a refrigerant reservoir. This lower part is further connected to the top of the rectification column 16, and the gas phase refrigerant that has flowed into the rectification column is liquefied in a cooler 19 that also serves as a reservoir, and flows through due to the difference in specific gravity between the gas and liquid phases of the refrigerant. .
Further, the refrigerant liquefied in the cooler 19 from the bottom of the rectification column 16 is connected to the pressure regulating decompressor 18, the main circuit pressure reducing device 14, and the evaporator 13, thereby forming a rectification circuit.

Next, the operation of the circuit having the above configuration will be explained.

The refrigerant discharged from the compressor 11 during heating is switched by the four-way valve 12, and high-temperature refrigerant flows into the condenser 15, which serves as a user-side heat exchanger and heats a room or the like. Furthermore, the refrigerant radiated by the condenser 15 is liquefied and divided into a rectification circuit provided in the middle of the pressure reducing device 14 in the main circuit and an evaporator 13 provided in the main circuit.

A pressure reducing device 17 is provided in the circuit branched to the rectification circuit, and the pressure of the refrigerant is reduced.

Here, the state of the refrigerant at point B is the required capacity of the Mollier wire utilization side heat exchanger shown in Figure 2 (solid line),
Small (dashed line) changes result in liquid region, two-phase (gas phase,
(liquid phase) region.

When the liquid region flows into the rectification column 16, the refrigerant composition is not separated as described above, and the refrigerant rich in low-boiling components circulates, increasing the capacity. Furthermore, the refrigerant in the two-phase region (the type of refrigerant in the two-phase region contains many low-boiling point components in the gas phase region and many high-boiling point components in the liquid phase region) similarly flows into the rectification column from the bottom. The gas phase in the two-phase region rises to the top of the rectification column, is cooled by the cooler 19, liquefied, and stored.

That is, a refrigerant rich in low-boiling components is stored in the cooler 19, and a refrigerant rich in high-boiling components is circulated in the main circuit, reducing the capacity.

In this way, efficient heat pump operation can be achieved by changing the composition of the refrigerant according to the required capacity.

Effects of the Invention As described above, the present invention constructs a refrigeration cycle by sequentially connecting a compressor, a four-way valve, a heat exchanger, and a main circuit decompression device using a non-azeotropic mixed refrigerant. A rectification column is installed between the pressure reduction device and the pressure reduction device, and depending on the required load, it is possible to easily separate or mix the low boiling point components of the non-azeotropic mixed refrigerant, and adjust the mixing ratio of the refrigerant flowing in the main circuit. By varying the capacity, it is possible to easily perform a wide range of efficient capacity control operations.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner according to an embodiment of the present invention, FIG. 2 is a Mollier diagram, and FIG. 3 is a refrigeration cycle diagram of a conventional heat pump room type air conditioner. 11... Compressor, 12... Four-way valve, 13... Evaporator, 14... Pressure reducing device, 15... Condenser, 16
... Rectification column, 17, 18 ... Pressure reducer, 19 ... Cooler.

Claims (1)

[Claims] 1 A compressor, a condenser, a throttling device, and an evaporator are connected in order in a ring to form a non-azeotropic mixed refrigerant refrigeration cycle, and between the freezing of the condenser and the throttling device of this non-azeotropic mixed refrigerant refrigeration cycle, , the bottom part of a refrigerant rectification column having a cooling function is connected to the upper part through a first pressure reduction device which is in a normally open state, and the bottom part of the refrigerant rectification column is connected to the top part through a second pressure reduction device which is in a normally open state. , a heat pump device connected between the throttle device and the evaporator connection.