JPH0460352A - Heat pump device - Google Patents

Abstract

PURPOSE:To make a pump run safely in a wide variety of temperature conditions, by charging the circulation of refrigerant in the first and, second refrigerating cycle according to running temperature conditions using the first and second four way type value to run the rectification separator. CONSTITUTION:The top end of rectification separator is connected with first supplementary throttle devices 32, 33 and first and second four way type valves 34, 35 by bypassing first main throttle device 24 of first refrigerating cycle C. The lower end of the rectification separator is connected with second supplementary throttle devices 36, 37 and the first and second four way type valve 34, 35 by bypassing second main throttle 29 of second refrigerating cycle D. when utilized heat exchanger 23 is used for heating circulating nonazeotropic mixed refrigerant of concentrated low boiling point refrigerant R22 in the second refrigerating cycle D and circulating nonazeotropic mixed refrigerant of concentrated high boiling point refrigerant R12 in the first refrigerating cycle C, make the temperature of heat exchanger 23 higher efficiently.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to improvements in heat pump devices for obtaining higher or lower temperatures for air conditioning, hot water supply, or ultra-low temperature equipment. 1. X. As a heat pump device that changes the refrigerant composition in the refrigeration cycle by composition separation, a device as shown in Fig. 2 has been proposed. A first refrigeration cycle A is constructed by connecting a throttling device 3, an evaporator 4, etc.L-A water side heat exchanger that acts as a condenser or an evaporator by switching the second compressor 5, four-way valve 6, and four-way valve 6 7. A second refrigeration cycle B is constructed by connecting a second main throttling device 8, an air-side heat exchanger 9 that acts as an evaporator or a condenser by switching the four-way valve 6, etc. By exchanging heat between the evaporator 4 of the first refrigeration cycle A and the water side heat exchanger 7 of the second refrigeration cycle B, it is possible to operate as a so-called two-way refrigeration cycle, and only the first refrigeration cycle can be operated. It is also possible to connect the bottom of the rectification separator 11 to the outlet of the condenser 2 via the first auxiliary throttle device 10, and connect the bottom of the rectification separator 11 to the second auxiliary throttle device 12 and the evaporator 4.
is connected to the suction side of the first compressor 1 through the water side heat exchanger 7, and connected to the top of the rectification separator 11 through a third auxiliary throttling device 13 to the outlet of the water side heat exchanger 7. 11 is connected to the four-way valve 6 via a fourth auxiliary throttle device 14 and an air-side heat exchanger 9 to form a composition separation circuit.

When operating both the first refrigeration cycle A and the second refrigeration cycle B of such a heat pump device, the first refrigeration cycle A and the second refrigeration cycle B are connected via the rectification separator 11. A rectification action occurs, and the high boiling point refrigerant is concentrated and circulated in the first refrigeration cycle A connected to the bottom of the rectification separator 11, and then circulated to the second refrigeration cycle B connected to the top of the rectification separator 11. The low boiling point refrigerant is concentrated and circulated.
The evaporator 4 of the refrigeration cycle and the water side heat exchanger 7 of the second refrigeration cycle are used for heat exchange.The condenser 2 of the first refrigeration cycle
Then, the higher temperature is transferred to the air side heat exchanger 9 of the second refrigeration cycle.
Therefore, it is possible to obtain a lower temperature.Problems to be Solved by the Invention As in Conventional Example 1 above, when composition separation is performed, the high boiling point refrigerant is always concentrated in the first refrigeration cycle A, and the high boiling point refrigerant is always concentrated in the second refrigeration cycle B. Even if the low boiling point refrigerant is concentrated, Konotabe Part 1
The refrigeration cycle A is suitable for heating, but when used for cooling, the specific volume of the refrigerant increases, resulting in a large device (L), which inevitably reduces efficiency. When used for heating, the refrigerant condensation pressure increases, making it unavoidable to increase the size of the device, and it also poses a problem from a safety standpoint. 1st compressor 1st condenser
First main throttling device A first refrigeration cycle consisting of a first evaporator, etc., a second compressor, a second condenser, a second main throttling device, a second
a second refrigeration cycle consisting of an evaporator, etc., and a rectification separator as main components; The lower end of the rectification separator is connected by bypassing the main throttling device of the second refrigeration cycle through the first four-way valve and the second four-way valve. The present invention is characterized by enclosing a non-azeotropic mixed refrigerant consisting of a boiling point refrigerant and a high boiling point refrigerant. By operating the rectification separator by switching the mixed refrigerant to the first refrigeration cycle or by switching the first four-way valve and the second four-way valve, the first refrigeration cycle is supplied with non-azeotropic mixed cold air enriched with high-boiling refrigerant.The second refrigeration cycle A non-azeotropic mixed refrigerant with a concentrated low-boiling refrigerant is used in the first refrigeration cycle, or a non-azeotropic mixed cold air with a concentrated low-boiling refrigerant is used in the second refrigeration cycle. The heat pump of the present invention circulates a boiling mixed refrigerant and improves the coefficient of performance under a wide range of operating conditions.Example: Hereinafter, an example of the present invention will be explained based on the accompanying drawings. 21 is a first compression 4a, 22 is a first main four-way valve, 23 is a user-side heat exchanger, and 24 is a first main throttle device 2.
5 is a first heat exchanger, and by connecting these pipes in sequence, a first refrigeration cycle C is constructed; 26 is a second compression; 27 is a second main four-way valve; and 28 is a second heat exchanger. 29 is a second main throttling device, 30 is an air side heat exchanger, and by connecting these in sequence, a second refrigeration cycle D is constructed. 31 is a rectification separator, the upper end of which is connected to the first The first main throttling device 24 of the refrigeration cycle C is bypassed and the first auxiliary throttling device 32, 33 is connected via the first sub-four-way valve 34 and the second sub-four-way valve 35. Bypassing the second main throttle device 29, the second auxiliary throttle device 36.37
In such a heat pump device, a non-azeotropic refrigerant mixture containing, for example, R12 as a high-boiling point refrigerant and, for example, R22 as a low-boiling point refrigerant, is used. First, we will explain the operation when operating with the refrigeration cycle C sealed.
A mixed refrigerant of a low boiling point refrigerant and a high boiling point refrigerant is circulated, and the cooling and heating capacity is increased compared to the case where only a high boiling point refrigerant is circulated.The second refrigeration cycle D functions to store surplus refrigerant of the mixed refrigerant.

Next, the case where both the first refrigeration cycle C and the second refrigeration cycle D are operated will be explained in order of the case where the user-side heat exchanger 23 is used for heating and the case where the user-side heat exchanger 23 is used for cooling. When used in the rectification separator 31, the first sub-four-way valve 34 and the second sub-four-way valve 35 are switched.
The bottom of the refrigeration cycle C is connected to the first refrigeration cycle C, and the top of the rectification separator 31 and the second refrigeration cycle D are connected. A part of the refrigerant that has passed through the exchanger 23 (passes through the first sub-four-way valve 34 and is depressurized to some extent by the second auxiliary throttling device 37 to become a gas-liquid two-phase state. In particular, the gas refrigerant passes through the rectification separator 31
In the second refrigeration cycle D, part of the refrigerant that has passed through the second compressor 26, the second main four-way valve 27, and the second heat exchanger 28 passes through the second sub-four-way valve 35, and then passes through the second sub-four-way valve 35. 1 The pressure is reduced to some extent by the auxiliary throttling device 33, resulting in a gas-liquid two-phase state, and in particular, the liquid refrigerant descends from the top of the rectification separator 31.At this time, inside the rectification separator 31, the rising gas refrigerant and the descending gas refrigerant flow. A rectification effect occurs due to sufficient gas-liquid contact with the liquid refrigerant, and the liquid refrigerant is enriched with R12, which is a high boiling point refrigerant, and the gas refrigerant is enriched with R22, which is a low boiling point refrigerant.
In this way, the R12 concentrated liquid refrigerant is mixed with the liquid refrigerant supplied by the second auxiliary throttling device 37 at the bottom of the rectification separator 31, and the liquid refrigerant is mixed with the liquid refrigerant supplied by the second auxiliary throttling device 36,
R2 is guided to the first heat exchanger 25 side through the sub four-way valve 35.
The gas refrigerant in which 2 is concentrated is mixed with the gas refrigerant supplied by the first auxiliary throttle device 33 at the top of the rectification separator 31, passes through the first auxiliary throttle device 32 and the first sub-four-way valve 34, and then heats the air side. If the operation continues as described above through the exchanger 30, R2, which is a low boiling point refrigerant, enters the second refrigeration cycle D.
A non-azeotropic mixed refrigerant enriched with R12, which is a high boiling point refrigerant, circulates in the first refrigeration cycle C, and the non-azeotropic mixed refrigerant enriched with R12, which is a high boiling point refrigerant, circulates to efficiently drive the user-side heat exchanger 23 to a higher temperature. However, when the user-side heat exchanger 23 is used for cooling, the first sub-four-way valve 34 and the second sub-four-way valve 35 are switched, and the rectification separator 31
The top of the refrigeration cycle C is connected to the first refrigeration cycle C, and the bottom of the rectification separator 31 is connected to the second refrigeration cycle D. A part of the refrigerant that has passed through the exchanger 25 (passes through the second auxiliary four-way valve 35 and is reduced in pressure to some extent by the first auxiliary throttling device 33 and becomes a gas-liquid two-phase state. Descending from the top & -4, in the second refrigeration cycle D, the second
A portion of the refrigerant that passes through the compressor 26, the second main four-way valve 27, and the air side heat exchanger 30 passes through the first sub-four-way valve 34, and then passes through the second
The pressure is reduced to some extent by the auxiliary throttling device 37, resulting in a gas-liquid two-phase state, and in particular, the gas refrigerant rises from the bottom of the rectification separator 31. A rectification effect occurs due to sufficient gas-liquid contact with the descending liquid refrigerant, and the gas refrigerant becomes R2, a low boiling point refrigerant.
In this way, the gas refrigerant enriched with R22 is transferred to the first auxiliary throttling device 33 at the top of the rectification separator 31.
The liquid refrigerant enriched with R12 is mixed with the gas refrigerant supplied by the auxiliary throttle device 32 and the first auxiliary four-way valve 34 and guided to the user-side heat exchanger 23.
The liquid refrigerant is mixed with the liquid refrigerant supplied by the second auxiliary throttling device 37 at the bottom of the refrigerant 1, and is led to the second heat exchanger 28 via the second auxiliary throttling device 36 and the second sub-four-way valve 35.

If the above operation continues, a non-azeotropic mixed refrigerant in which R12, a high boiling point refrigerant, is concentrated circulates in the second refrigeration cycle D, and R2, a low boiling point refrigerant, circulates in the first refrigeration cycle C.
The non-azeotropic mixed refrigerant in which the refrigerant 2 is concentrated is circulated, and the user-side heat exchanger 23 can be efficiently brought to a lower temperature.

Effects of the Invention As described above, the heat pump device of the present invention circulates high boiling point refrigerant in the first refrigeration cycle to the heating refrigeration cycle by switching the four-way valve connected to the rectification separator. In addition, in the cooling refrigeration cycle, a low boiling point refrigerant is circulated through the first refrigeration cycle to increase the pressure inside the evaporator, making it possible to operate efficiently and safely under a wide range of temperature conditions. can.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a heat pump device according to an embodiment of the present invention. Fig. 2 is a block diagram of a conventional heat pump device. ,
23... User-side heat exchange image 24... First main expansion device 25... First heat exchanger 26... Second compression a 27
...Second main four-way valve, 28...Second heat exchange bolt 29.
...Second main restrictor W1.30...Air side heat exchange @ 3
1... Rectification separator 32. 33... First auxiliary throttling device 34... First sub four-way valve, 35... Second sub four-way valve,
36, 37...Second auxiliary throttling device C...First refrigeration cycle, D...Second refrigeration cycler

Claims (1)

[Claims] A first refrigeration cycle consisting of a first compressor, a first condenser, a first main throttle device, a first evaporator, etc., a second compressor, a second condenser, a second main throttle device, a second evaporator, etc. and a rectification separator as main components, the upper end of the rectification separator is connected to the first main throttling device of the first refrigeration cycle through a first four-way valve and a second four-way valve. The lower end of the rectification separator is connected by bypassing the second main throttling device of the second refrigeration cycle through the first four-way valve and the second four-way valve, and A heat pump device characterized by enclosing a non-azeotropic mixed refrigerant consisting of a refrigerant and a high boiling point refrigerant.