JPH0246864B2 - NETSUHONPUSOCHI - 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 performs capacity control by changing the concentration of refrigerant circulating in a cycle using a refrigerant rectification column.

Configuration of conventional example and its problems Figure 1 shows the concentration of the non-azeotropic mixed refrigerant circulating in the cycle between the refrigerant liquid with a high concentration of low boiling point components and the refrigerant with a high concentration of high boiling point components separated by a refrigerant rectification column. FIG. 2 is a schematic configuration diagram of a heat pump device described in a previous application (Japanese Patent Application Laid-open No. 59-38566) that controls the refrigerating capacity by changing the mixing ratio of liquids. In Fig. 1, 1 is a compressor, 2 is a high temperature side heat exchanger, 3 is a refrigerant rectification column, 4 is a heat exchanger, 5 and 6 are flow control valves, 7 and 8 are throttling devices, and 9 is a low temperature side It is a heat exchanger.

The operation of the heat pump device configured as above will be explained. First, the refrigerant vapor discharged from the compressor 1 is condensed in the high temperature heat exchanger 2, and is then condensed in the rectification column 3.
and is separated into vapor V rich in low boiling point components and liquid L rich in high boiling point components. Liquid L rich in high boiling point components
is divided into two circuits, one is heated in the high-temperature side heat exchanger 2 and returns to the rectification column 3, and the high-temperature side heat exchanger 2 is used as a heating source for the rectification column, and the other is a throttle device 7.
After being expanded to a low pressure and generating cold within the heat exchanger 4, it is circulated to the inlet of the compressor 1. In addition, the steam V rich in low-boiling components is condensed in the heat exchanger 4 and then divided into two circuits, one of which returns to the rectification column 3 and the other expanded to a low pressure by the throttle device 8 and passed through the low-temperature side heat exchanger 9. It absorbs heat and circulates to the compressor 1. It is generally known that in order to change the capacity of a heat pump device, it is sufficient to change the concentration of the refrigerant circulating in the cycle, and for this purpose, the flow control valves 5 and 6 are used in the configuration shown in FIG. It is possible to change the mixing ratio of refrigerant vapor rich in high powder point components and refrigerant vapor rich in low boiling point components, which are mixed at the inlet of the compressor 1 by adjusting as appropriate.

However, in the heat pump device configured as described above, since the steam at the outlet of the compressor 1 whose pressure is approximately equal to the internal pressure of the rectification column 3 is used as the heating source for the rectification column 3, There was a problem in that the difference in heat transfer temperature with the liquid L rich in boiling point components was small, and the high temperature side heat exchanger 2 required a large heat transfer area.
In some cases, an electric heater is used as a heating source for the rectification column, but this is not preferable because the electric input increases.

Purpose of the Invention The purpose of the present invention is to reduce the size of a heat exchanger used in a rectification column for changing the concentration of refrigerant circulating in a cycle, and to reduce the amount of power required to operate the rectification column. It provides:

Composition of the Invention As a structure for achieving this object, the present invention has a refrigerant rectification column with an intermediate pressure between the internal pressure of the high temperature side heat exchanger and the internal pressure of the low temperature side heat exchanger, and the rectification column is used for thermal cycling. It is characterized by adjusting the refrigerant composition ratio of the non-azeotropic mixed refrigerant.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a schematic diagram of an embodiment of the heat pump device of the present invention. In FIG. 2, 10 is a compressor, 11 is a three-way valve, 12 is a high temperature side heat exchanger, 1
3 and 14 are expansion devices, 15 is a three-way valve, 16 is a low-temperature side heat exchanger, 17 is a refrigerant rectification column, 18 is a heat exchanger for heating the rectification column, 19 is a high boiling point liquid reservoir, and 20 is a rectification column 21 is a cooling throttle device, 22 is a heat exchanger for cooling the rectification tower, and 23 is a low boiling point liquid reservoir; 23 and 24 are flow rate regulating valves 2;
5 and 26 are check valves.

The operation of the pump device configured as above will be explained below. First, during normal operation, the three-way valves 11 and 15 are open in the direction shown in FIG.
3, the three-way valve 15, the throttling device 14, the low temperature side heat exchanger 16, the compressor 10, and the high temperature side heat exchanger 1.
2 performs heat radiation, and the low temperature side heat exchanger 16 performs heat absorption. To change the concentration of the refrigerant circulating in the cycle, first switch the three-way valves 11 and 15 to the right by 180 degrees, and transfer a part of the refrigerant discharged from the compressor 10 to the three-way valve 11 for heat exchange for heating the rectification column. 18 , a rectifier cooling expansion device 20 , a rectifier cooling heat exchanger 21 , a check valve 25 , and a compressor 10 . Squeezing device 1
In the rectifying column 17 located at the intermediate pressure position between 3 and 14, the refrigerant liquid rich in high-boiling components in the high-boiling point liquid reservoir 19 is boiled in the rectifying column heating heat exchanger 18.
A heat exchanger 21 for cooling the rectifying column condenses the refrigerant vapor rich in low-boiling components generated in the rectifying column 17, and the condensed liquid is stored in a low-boiling liquid reservoir 22. Low boiling point liquid reservoir 22
The liquid overflowing from the rectifier 17 flows down into the rectifier 17.
It comes in contact with the refrigerant vapor rising inside the tube, increasing the rectification effect. Next, the three-way valve 11 is returned to its original position, the three-way valve 15 is switched 90 degrees to the right from the figure, and the flow rate control valves 23 and 24 are adjusted to keep the liquid rich in high boiling point components and the liquid rich in low boiling point components at a predetermined level. The mixture is mixed in proportion and flows through the check valve 26 toward the throttle device 14, after which the three-way valve 15 is returned to its original position.

In the present invention shown in the upper air embodiment, the operating pressure of the rectification column 17 is set to an intermediate pressure between the internal pressure of the high-temperature side heat exchanger 12 and the internal pressure of the low-temperature heat exchanger 16.
The boiling temperature of the high boiling point liquid in the rectifying column 17 can be lowered as necessary, and the condensing temperature of the low boiling point vapor in the rectifying column 17 can be increased as necessary. When the rectifying column 17 is heated and cooled by the heat exchangers 18 and 21 connected to the outlet side and the inlet side of the rectifying column 10, the heat transfer temperature difference between these heat exchangers becomes large. The heat transfer area of both the heat exchanger 18 and the cooling heat exchanger 21 can be reduced, and both heat exchangers can be made smaller and cheaper. Further, since the heat pump effect of the compressor 10 is used to heat the rectification column 17 without using an electric heater, there is an effect that less electric power is required to operate the rectification column 17.

Although this embodiment does not explain the injection injection into the compressor that is normally performed, the present invention also includes a heat pump device having an injection circuit as well as a rectification column that operates at an intermediate pressure. It is within the scope of the present invention that the refrigerant circulation direction of the high temperature heat exchanger and the low temperature heat exchanger can be switched in the opposite direction to that of the above embodiment using a four-way valve or the like.

Effects of the Invention According to the present invention, the heating heat exchanger and the cooling heat exchanger of the refrigerant rectification column for changing the concentration of the refrigerant circulating in the cycle can be made small and inexpensive, and the refrigerant rectification column can be operated. It requires less electricity to do so.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a heat pump device using a refrigerant rectification column described in the previous application, and FIG. 2 is a circuit diagram showing an embodiment of the heat pump device of the present invention. 10... Compressor, 11, 15, 20... Three-way valve, 12... High temperature side heat exchanger, 13, 14... Throttle device, 17... Refrigerant rectification column, 23, 24... Flow control valve.

Claims (1)

[Claims] 1. A heat pump cycle in which a compressor, a high temperature side heat exchanger, a first expansion device, a second expansion device, and a low temperature side heat exchanger are connected in an annular manner, and a heat pump cycle that circulates through the heat pump cycle. A non-azeotropic mixed refrigerant consisting of two or more components is connected via a branch valve between the first throttle device and the second throttle device, and the intermediate pressure between the high temperature side heat exchanger and the low temperature side heat exchanger is a refrigerant rectification column operating in
A liquid reservoir for storing the refrigerant component liquid of the non-azeotropic mixed refrigerant separated in the refrigerant rectification column, and a liquid reservoir for storing the refrigerant component liquid of the non-azeotropic mixed refrigerant separated in the refrigerant rectification column, and a concentration of the refrigerant circulating in the heat pump cycle by adjusting the amount of the refrigerant component liquid flowing into the heat pump cycle. A heat pump device comprising at least a flow rate adjusting means for changing the flow rate, the liquid reservoir being connected to a pressure section lower than the intermediate pressure of the heat pump cycle via the flow rate adjusting means. 2. The heat pump device according to claim 1, wherein the heating of the liquid in the refrigerant rectification column and the condensation of the vapor are performed by heat exchangers connected to the outlet side and the inlet side of the compressor.