JPH0621722B2 - Super heat pump device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a compressor used in a super heat pump.

[Technical background of the invention and its problems] Recently, by using night surplus power as a means for leveling the load of electric power, energy is highly efficiently and highly multiplied and stored, and energy for daytime is stored. It is used as a large-scale heat source for air conditioning of large buildings, large-scale district heating / cooling, and heating in various industrial processes by taking out as temperature or cold when necessary.

In the above-mentioned means, a super heat pump is used, and its development has been actively promoted in recent years. Fourth
The figure is a diagram showing a cycle of a conventional super heat pump. This heat pump has a structure capable of suppressing irreversible energy loss during heat exchange with a heat source fluid by using a single-component working medium, and has a high temperature cycle unit 1 having a structure described below. And a low temperature cycle unit 2. The high temperature cycle unit 1 is connected to a compressor 4 driven by a motor 3 for compressing a working medium, and a plurality of extraction pipes 5a to 5d for extracting air from each stage of compression of the compressor 4 so as to connect the respective independent heat exchange chambers. The condenser 6, the expanders 7a to 7d for communicating the high temperature heat fluid 16 and the high temperature heat-exchanged working medium communicating with the independent heat exchange chamber of the condenser, and the working medium discharged from the expander together. And a pipe 9 which passes through the cascade heat exchanger 8 and guides it to the suction port of the compressor 4 to form a closed loop.

On the other hand, the low temperature cycle section 2 drives the motor 10 to compress the working medium, and the working medium to the evaporator 13 via the cascade heat exchanger 8 and the expander 12 which are connected to the discharge port of the compressor. A closed loop is constituted by a pipe 14 for guiding and a pipe 15 for guiding the working medium, which has undergone low-temperature heat exchange with the low-temperature heat medium 17 in the evaporator, to the suction port of the compressor 11. In the figure, 16 indicates a high temperature thermal fluid, and 17 indicates a low temperature thermal fluid.

In the super heat pump configured as above,
Whereas designing a compressor with high operating efficiency is one of the most important things, the conventional compressor is an integrated type,
Since it has a complicated structure such as extracting the working medium in the stage of compression, it is difficult to make it a highly efficient compressor.

[Object of the Invention] The present invention has been made based on the above circumstances, and an object of the present invention is to obtain a compressor for a super heat pump having extremely high operating efficiency.

[Summary of the Invention] A super heat pump device of the present invention has a first compressor for compressing a working medium enclosed in a first closed circuit, and a plurality of independent heat exchange chambers for condensing the working medium. A condenser, a second compressor for compressing the working medium enclosed in the second closed circuit, and a plurality of independent heat exchange chambers for evaporating the working medium compressed by the second compressor A super heat pump device comprising an evaporator, wherein at least one of the first compressor and the second compressor is a combination of a plurality of unit centrifugal compressors connected by the same shaft, and One is a multi-stage compressor composed of a double suction type unit centrifugal compressor, and the discharge port or the suction port of the unit compressor of each stage is independent of the condenser or evaporator by an extraction pipe or pipe for each stage. In each of the heat exchange chambers It is characterized in that they are made to correspond to each other, and the discharge port or the suction port of the unit centrifugal compressor of each stage is communicated with the suction port or the discharge port of the next stage, respectively.

[Embodiment of the Invention] The same parts as those in FIG. 4 are designated by the same reference numerals, and FIG. 1 shows a cycle of a super heat pump apparatus using an embodiment of the present invention. In this super heat pump, the compressor of the present invention is used in the high temperature cycle unit 1. That is, the double suction type unit centrifugal compressors 4a, 4b, 4c and the single suction type unit centrifugal compressor 4d are connected to the same shaft to form the multi-stage compressor 4 of the high temperature cycle unit 1. The discharge ports of the unit centrifugal compressors 4a to 4d are connected to the independent heat exchange chambers of the condenser 6 by extraction pipes 5a to 5d, respectively.
Further, the discharge ports from the first-stage unit centrifugal compressor 4a to the third-stage unit centrifugal compressor 4c are connected to the suction ports of the next-stage unit centrifugal compressors. In addition, each extraction pipe 5
A flow control valve 1 is provided at a position near each compressor discharge port of a to 5d.
8a to 18d are provided respectively. Also, the inflator 7a
The working medium passing through 7d is collectively returned to the intake port of the first-stage unit centrifugal compressor 4a via the cascade heat exchanger 8. The structure of the low temperature cycle unit 2 is similar to that shown in FIG.

As is apparent from the above, the compressor of the present invention drives a plurality of unit centrifugal compressors to be connected and driven by the same shaft, extracts the working medium from the discharge port of each unit centrifugal compressor, or Since it is supplied to the unit centrifugal compressor, it is possible to eliminate bleed air in the middle of compression of the compressor and supply to the next stage, which does not require a calculation process with many uncertain factors for compressor design, An accurate and highly efficient compressor can be designed. In addition, even though the compressor is configured with a multi-stage unit centrifugal compressor, it is as described above,
Since it is not necessary to consider each stage in a coupled manner and each stage can be explained independently, it is possible to design speedily without degrading the calculation accuracy.

FIG. 2 in which the same parts as those in FIGS. 4 and 1 are designated by the same reference numerals shows another embodiment of the present invention. In this embodiment, a single-suction type unit centrifugal compressor is added in addition to the single-suction type centrifugal compressor 5d of the embodiment shown in FIG. 1 so that the suction ports 5e are opposite to each other. In this embodiment, the thrust force acting on the shaft during operation can be controlled.

FIG. 3 in which the same parts as those in the above figures are denoted by the same reference numerals shows a cycle of another example of a super heat pump using the compressor of the present invention. In this figure, the structure of the high temperature cycle unit 1 is exactly the same as that of FIG. 1, and the compressor of the low temperature cycle unit 2 is the same as the first compressor 4 in the unit centrifugal compressors 11a.
The multi-stage compressor 11 has a multi-stage 11d. The suction side of each unit centrifugal compressor 11a-11d is pipe 1
5a to 15d are respectively connected to the outlet side of the evaporator 13, and the discharge ports of the unit centrifugal compressors 11d to 11d are sequentially connected to the suction port of the unit centrifugal compressor of the next stage, and the final stage unit centrifugal compressor. The discharge port of the compressor 11a communicates with the independent heat exchange chamber of the evaporator 13 via the pipe 14 to the expander 1
2a to 12d. The working medium that has undergone low-temperature heat exchange with the low-temperature heat fluid 17 in the independent heat exchange chamber of the evaporator 13 is subjected to a unit centrifugation at a corresponding pressure from pressure ports provided in each heat exchange chamber and having different pressure levels through the pipes 15a to 15d. Guided to the compressor suction port of the compressor.

In addition, the compressor of the present invention is not limited to the illustrated usage mode, and it is possible to use the conventional compressor for the high temperature cycle part and use the compressor of the present invention only for the low temperature cycle part. .

[Effects of the Invention] Since the compressor of the present invention is a multi-stage compressor composed of unit centrifugal compressors connected to the same shaft, it is easy to provide a working medium having a pressure level according to the purpose from the discharge port of each unit centrifugal compressor. Since it is possible to bleed air into the compressor and there is no need to bleed air during compression of the compressor, it is not necessary to take complicated calculation processes with many uncertain factors, and it is possible to design the compressor with high accuracy, which results in high efficiency. It becomes possible to design the compressor. Further, since it has the above-mentioned configuration, it is not necessary to consider each stage in combination in designing, and each stage can be designed independently, so that the design can be simplified without lowering the accuracy.

[Brief description of drawings]

FIG. 1 is a diagram showing a cycle of a super heat pump using the compressor of the present invention, FIG. 2 is a schematic diagram of an essential part of another embodiment of the present invention, and FIG. 3 is a diagram showing the use of the compressor of the present invention in FIG. FIG. 4 is a diagram showing a cycle of another example of the super heat pump
The figure is a diagram showing a cycle of a conventional super heat pump. 1 ... High temperature cycle part, 2 ... Low temperature cycle part, 4, 1
1 ... Compressor, 4a-4d ... Unit centrifugal compressor, 6 ...
Condenser, 7a to 7d, 12 ... Expander, 8 ... Cascade heat exchanger, 13 ... Evaporator

Claims (1)

[Claims] 1. A first compressor for compressing a working medium enclosed in a first closed circuit, a condenser having a plurality of independent heat exchange chambers for condensing the working medium, and a second closed circuit. Super heat pump device having a second compressor for compressing the working medium enclosed in the circuit, and an evaporator having a plurality of independent heat exchange chambers for evaporating the working medium compressed by the second compressor At least one of the first compressor and the second compressor is a combination of a plurality of unit centrifugal compressors connected by the same shaft, and one of them is a double suction unit centrifugal unit. It is a multi-stage compressor composed of compressors, and the discharge port or suction port of the unit compressor of each stage corresponds to each independent heat exchange chamber of the condenser or evaporator by the extraction pipe or piping for each stage. And communicate with each other, and unit centrifugation at each stage A super heat pump device characterized in that the discharge port or the suction port of the compressor is connected to the suction port or the discharge port of the next stage, respectively.