JPH0735930B2 - Heat pump device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a heat pump device that uses a non-azeotropic mixed refrigerant to store a high boiling point refrigerant by composition separation to change the circulating composition.

2. Description of the Related Art Conventionally, as a heat pump device that uses a non-azeotropic mixed refrigerant and stores a high boiling point refrigerant by composition separation to change the composition,
A device as shown in the figure has been proposed. In FIG. 2, 1 is a compressor, 2 is a condenser, 3 is a first expansion device, and 4 is an evaporator, and these are connected by piping to form a main circuit. 5 is a rectification separator filled with a packing material,
This top is connected to the outlet of the condenser 2, and the top is also connected to the inside of the cylinder of the compressor 1 via the on-off valve 6, and a reservoir 8 having a heater 7 built in is provided below the rectification separator 5. The reservoir 8 has an open / close valve 9
It is also connected to the evaporator 4 via the second expansion device 10.

A method of enclosing a non-azeotropic mixed refrigerant in such a refrigeration cycle apparatus and varying the circulating composition will be described. First, in the non-separation mode, the heater 7 is turned off, the on-off valve 6 is closed, and the on-off valve 9 is opened, so that the reservoir 8
Since the excess refrigerant is stored in the refrigerant and only a part of the refrigerant flows out to the evaporator 4 via the second expansion device 10, the main circuit remains the composition of the mixed refrigerant rich in the high boiling point refrigerant. I will drive. Next, in the separation / separation mode, the heater 7 is turned on, the opening / closing valve 6 is opened, and the opening / closing valve 9 is closed, so that the low boiling point refrigerant in the refrigerant inside the reservoir 8 is mainly vaporized, and the rectification separator 5 Ascend inside. At this time, the liquid refrigerant is supplied from the outlet of the condenser 2 to the upper part of the rectification separator 5, and the rectification action occurs due to the gas-liquid contact inside the rectification separator 5, and the rising gas increases the concentration of the low boiling point refrigerant, The liquid descending to the high concentration has a high concentration of the high boiling point refrigerant, and the high boiling point refrigerant is mainly stored in the reservoir 8 in the state of a condensed liquid. On the other hand, the rising gas rich in low boiling point refrigerant is injected into the cylinder of the compressor 1 through the on-off valve 6, compressed to a high pressure together with the suction gas, and then flows into the condenser 2 again.
The main circuit can be operated with a mixed refrigerant composition rich in low boiling point refrigerant. To restore the composition of the main circuit, turn off the heater 7 and open the on-off valve 9, and open the reservoir 8.
The high-boiling-point refrigerant therein mixes into the main circuit, and the main circuit has a composition of a mixed refrigerant rich in high-boiling-point refrigerant in a sealed state.

Such a composition-variable type heat pump device is applied to a hot water supply device, etc., and in normal use, it is necessary to operate with the enclosed composition rich in high boiling point refrigerant as it is to obtain high temperature water and store hot water in the shortest possible time. In this case, a method of operating with a composition rich in a low boiling point refrigerant having a high heating capacity becomes possible.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the heat pump device as described above, when the switching mode is switched from the separation mode to the non-separation mode, the on-off valve 9 is opened so that the high boiling point of the high temperature heated by the heater or the like in the separation mode. The liquid refrigerant passes through the on-off valve 9 as it is,
After the pressure was reduced to a low pressure by the second expansion device 10, it flowed into the evaporator 4. Therefore, since the high temperature liquid refrigerant with a relatively high enthalpy flows into the evaporator as it is, the amount of heat absorption that can be obtained from the heat source side in the evaporator originally decreases, and therefore the amount of heat radiation on the use side also decreases. However, there was a problem that the coefficient of performance decreased.

Means for Solving the Problems A heat pump device of the present invention is a main circuit in which a non-azeotropic mixed refrigerant is sealed and a compressor, a condenser, a first expansion device, an evaporator, an auxiliary heat exchanger, etc. are sequentially connected. The upper part of the rectification separator, which is provided with a reservoir and heating means for heating the refrigerant inside the reservoir, is connected to the condenser outlet, and the bottom of the reservoir is connected via an on-off valve. Is connected to the auxiliary heat exchanger to indirectly exchange heat with the refrigerant flowing in the main circuit, and is further connected to the evaporator inlet via the second expansion device from the auxiliary heat exchanger. It is characterized by that.

Effect The present invention has the above-described configuration, and the high boiling liquid refrigerant in the bottom reservoir which has been heated by a heater or the like in the mode with separation is heated between the evaporator and the compressor at the time of switching to the mode without separation. After the heat exchange with the intake gas of the main circuit by the provided auxiliary heat exchanger, it flows into the evaporator inlet, the high temperature liquid refrigerant is cooled and the enthalpy decreases, so the amount of heat absorbed by the evaporator increases. To do. Also, since the inhaled gas is heated oppositely, the enthalpy increases and the amount of heat released on the user side can be increased sufficiently,
The coefficient of performance is improved.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 11 is a compressor, 12 is a condenser, 13 is a first expansion device, 14 is an evaporator, and 15 is an auxiliary heat exchanger, and these are connected by piping to form a main circuit. . Reference numeral 16 denotes a rectification separator filled with a packing material, the top of which is connected to the outlet of the condenser 12 by a pipe, and the top of which is also connected to the inside of the cylinder of the compressor 11 via an opening / closing valve 17. Further, a reservoir 19 having a built-in heater 18 is arranged below the rectification separator 16, and the bottom of this reservoir 19 is connected to an auxiliary heat exchanger 15 via an on-off valve 20 and the main circuit there. After the heat is exchanged with the refrigerant discharged from the side evaporator 14, it is connected to the inlet of the evaporator 14 via the second expansion device 21.

An operation method of enclosing a non-azeotropic mixed refrigerant in such a refrigeration cycle apparatus and varying the circulation composition will be described. First, in the separation mode, turn on the heater 18,
By opening the on-off valve 17 and closing the on-off valve 20, mainly the low boiling point refrigerant in the refrigerant inside the reservoir 19 is vaporized and the inside of the rectification separator 16 rises. At this time, the liquid refrigerant is supplied from the outlet of the condenser 12 to the upper part of the rectification separator 16, and the rectification action occurs due to the gas-liquid contact inside the rectification separator 16, and the rising gas has a high concentration of the low boiling point refrigerant, and the reverse The liquid descending to the high concentration has a high concentration of the high boiling point refrigerant, and the high boiling point refrigerant is mainly stored in the reservoir 19 in a condensed state. On the other hand, the rising gas rich in low boiling point refrigerant is injected into the cylinder of the compressor 11 through the on-off valve 17, compressed to a high pressure together with the suction gas, and flows into the condenser 12. By doing so, the main circuit can be operated with the composition of the mixed refrigerant rich in the low boiling point refrigerant.

And to switch to the no separation mode, the heater 18
Is turned off, the on-off valve 17 is closed, and the on-off valve 20 is opened. By doing so, the high-temperature high-boiling-point liquid refrigerant in the reservoir 19 flows into the main circuit through the on-off valve 20, the auxiliary heat exchanger 15, and the second expansion device 21, so that the main circuit has a high-boiling point in a sealed state. It will be operated with the composition of the mixed refrigerant rich in refrigerant. Here, the high-temperature high-boiling-point liquid refrigerant in the reservoir 19 is cooled in the auxiliary heat exchanger 15 by indirectly exchanging heat with the low-temperature gas refrigerant discharged from the evaporator 14 of the main circuit,
The temperature decreases, and after the pressure is further reduced to a low pressure by the second expansion device 21, it merges with the main circuit and flows into the evaporator 14. This reduces the enthalpy of the hot liquid refrigerant and increases the amount of heat absorbed by the evaporator. Further, since the inhaled gas is heated, the enthalpy increases, and the amount of heat released on the user side can be sufficiently increased.

Further, even after the hot liquid refrigerant in the reservoir 19 flows out, a part of the liquid refrigerant leaving the condenser 12 continuously flows into the auxiliary heat exchanger 15 through the on-off valve 20 and evaporates. Since it exchanges heat with the gas refrigerant flowing out of the vessel 14, the same effect is exhibited.

To return to the separation mode, turn on the heater 18.
Then, when the on-off valve 20 is closed and the on-off valve 17 is opened, the rectification action is started again, and the main circuit becomes the composition of the mixed refrigerant rich in the low boiling point refrigerant.

A high-temperature heat source in the refrigeration cycle such as the discharge pipe of the compressor 11 may be used as the heating source of the rectification separator, instead of the heater 17, and these are included in the present invention.

Further, in the present embodiment, the top of the rectification separator 16 is connected to the inside of the cylinder of the compressor 11 via the outlet of the condenser 12 and the on-off valve 17 by piping, but both are connected to the outlet of the condenser. Alternatively, the condenser outlet and the evaporator inlet may be connected, and these are also included in the present invention.

As described above, in the heat pump device of the present invention, after the high-temperature high-boiling-point liquid medium in the bottom reservoir is indirectly heat-exchanged with the intake gas of the main circuit by the auxiliary heat exchanger. , The liquid refrigerant is cooled, the enthalpy is reduced, and the amount of heat absorbed by the evaporator can be increased. Further, since the inhaled gas is heated, the enthalpy increases, the amount of heat released on the user side can be sufficiently increased, and the coefficient of performance improves.

[Brief description of drawings]

FIG. 1 is a block diagram of a heat pump device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional heat pump device. 11 …… Compressor, 12 …… Condenser, 13 …… First throttling device, 14
…… Evaporator, 15 …… Auxiliary heat exchanger, 16 …… Rectification separator,
17,20 …… Open / close valve, 18 …… Heater, 19 …… Reservoir, 21 …… Second throttling device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Yoshida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koji Arita, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A non-azeotropic mixed refrigerant is enclosed, and a compressor, a condenser, a first expansion device, an evaporator, an auxiliary heat exchanger, etc. are sequentially connected to form a main circuit, and a reservoir and a reservoir are provided at a lower portion. The top of the rectification separator provided with heating means for heating the refrigerant inside the reservoir is connected to the condenser outlet, and the bottom of the reservoir is connected to the auxiliary heat exchanger via an on-off valve. A heat pump device, which is configured to indirectly exchange heat with the refrigerant flowing through the main circuit, and is further connected to the evaporator inlet via the second expansion device from the auxiliary heat exchanger.