JPS63279062A - Refrigeration cycle device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in refrigeration cycle devices for obtaining extremely high or low temperatures, such as air conditioning, hot water supply, or ultra-low temperature devices.

2. Description of the Related Art Conventionally, as a refrigeration cycle apparatus for obtaining high or low temperature, a multi-component refrigeration cycle apparatus in which a plurality of refrigeration cycle apparatuses are connected in a cascade manner is known. Figure 2 shows an example in which this is applied as an air-conditioning/heating/hot water supply system.Compressor AI, hot water supply heat exchanger A2 which always acts as a condenser,
The upper stage refrigeration cycle A is constructed by connecting an expansion valve A3 that performs a pressure reducing action, a water side heat exchanger A4 that always functions as an evaporator, and the like. Next, compressor B6, four-way valve B6, four-way valve B
6, the water side heat exchanger B7 acts as a condenser or evaporator, the expansion valve B8 acts as a pressure reducer, and the four-way valve B6
A lower refrigeration cycle B is constructed by connecting the air side heat exchanger B9, which functions as an evaporator or a condenser, by switching between the two. Here, the upper refrigeration cycle A is filled with a fluorocarbon-based single refrigerant R12, and the lower refrigeration cycle B is filled with a fluorocarbon-based single refrigerant R22, and the water side heat exchangers A4 and BT are the same. It is arranged in a heat storage tank 10, and is configured so that heat-exchanged water and the like are passed through a circulation circuit (not shown) for heating and cooling.

In the summer season, this device mainly operates in the refrigeration cycle A, and while the water side heat exchanger A4 produces cold water, the exhaust heat is used to produce hot water in the hot water supply heat exchanger A2. Also, when the cooling load increases, the refrigeration cycle B
The water side heat exchanger B7 acts as an evaporator to supplement the cold water, and its waste heat is discharged from the air side heat exchanger B9, which acts as a condenser. Furthermore, when the cooling load decreases and the chilled water temperature drops extremely, the refrigeration cycle B is switched and the water side heat exchanger BT acts as a condenser to heat the water.

Next, in the intermediate period, since there is generally only hot water supply mode, the refrigeration cycle B is operated as appropriate and hot water is supplied by the refrigeration cycle A while being heated by the water side heat exchanger B7.

Further, in the winter, while the refrigeration cycle B is continuously operated and heated, the refrigeration cycle A is operated to supply hot water, and when the heating load increases, the refrigeration cycle A is stopped and the heating mode is prioritized.

Problems to be Solved by the Invention The above conventional example uses a dual refrigeration cycle device, and a high temperature A boiling point refrigerant R12 and a low boiling point refrigerant 122 are used in the lower stage.

However, during the summer and mid-season, the upper 112
Since the flow refrigerant has a small cooling and heating capacity, the refrigeration cycle B of R22 on the lower stage side is frequently operated, resulting in uneconomical operation. Furthermore, in the hot water supply mode during the summer, there is no need to raise the temperature of the hot water to a high temperature, and the range of temperature change may be small, which is also uneconomical.

The present invention does not merely solve the problems of the conventional air-conditioning/heating water heater, but also addresses the need to temporarily increase the air outlet temperature of the air-conditioning/heating system, especially in the heating mode.
This proposes a new refrigeration cycle configuration.

Means for Solving the Problems The refrigeration cycle device according to the present invention includes an upper refrigeration cycle consisting of a compressor, a condenser, a pressure reducing device, an evaporator, etc. The main components are a rectification separator and a lower refrigeration cycle consisting of By bypassing and connecting the upper stage evaporator and lower stage condenser to exchange heat directly or indirectly, and by enclosing a non-azeotropic mixed refrigerant consisting of a low boiling point refrigerant and a high boiling point refrigerant in the refrigeration cycle. configured.

In such a refrigeration cycle device, when only the upper refrigeration cycle is operated, a mixed refrigerant of a low-boiling point refrigerant and a high-boiling point refrigerant is circulated, and cooling and cooling are improved compared to when only a high-boiling point refrigerant is circulated. The heating capacity increases, and the lower refrigeration cycle functions to store surplus refrigerant of the mixed refrigerant. On the other hand, when operating both the upper and lower stages, rectification occurs because they are connected via a rectification separator, and the high boiling point refrigerant is concentrated in the upper stage refrigeration cycle connected to the bottom. The low boiling point refrigerant is condensed and circulated in the lower refrigeration cycle connected to the top, and the upper evaporator and lower condenser exchange heat, so the upper condenser has higher temperature. The lower evaporator makes it possible to obtain a much lower temperature.

Embodiment The refrigeration cycle device according to the present invention will first be described with reference to an embodiment in which it is applied to an air-conditioning/heating/hot-water supply device in comparison with a conventional example. 1st
In the figure, 11 to 20 are the same components as 1 to 1o in the conventional example, and a rectification separator 21 is sandwiched between them, and the bottom part bypasses the expansion valve A13 of the upper refrigeration cycle A and is throttled. The top part of the refrigeration cycle B bypasses the expansion valve B1s of the lower refrigeration cycle B and is connected via the throttle devices 24 and 25.

In such a refrigeration cycle device, a case will be described below in which a non-azeotropic refrigerant mixture consisting of, for example, R12, which is a high boiling point refrigerant, and R22, which is a low boiling point refrigerant, is sealed. When operating only the upper refrigeration cycle device A (for example, hot water supply cooling mode in summer), the lower refrigeration cycle B
is not operated, liquid return from the top of the rectification separator 21 is not performed, and no rectification action occurs, so the lower stage side simply serves to store surplus refrigerant of the mixed refrigerant. For this reason, the upper stage refrigeration cycle A is operated with the same concentration of the enclosed mixed refrigerant, and the cooling capacity for air conditioning and the heating capacity for hot water supply are increased more than before, and the lower stage refrigeration cycle A is operated as the cooling load increases or decreases. Cycle B is operated less frequently. In addition, when the lower stage refrigeration cycle B is also subjected to cooling operation, in the refrigeration cycle B, a part of the refrigerant that has passed through the compressor B16, four-way valve B16, and air side heat exchanger B19 is passed through the throttling device 25. The pressure is reduced to some extent and a gas-liquid two-phase state is formed. In particular, the liquid component descends from the top of the rectification separator 21. On the other hand, in the refrigeration cycle A operated on the upper stage side, the compressor A11 and the hot water supply heat exchanger 12
A part of the refrigerant that has passed through is reduced in pressure to some extent by the throttling device 22 and becomes a gas-liquid two-phase state, and the gas component in particular rises from the bottom of the rectification separator 21. At this time, inside the rectification separator 21, through the surface of the packed filler (not shown),
Rectification occurs due to gas-liquid contact between the descending liquid component and the ascending gas component. Therefore, the rising gas component has a high concentration of low boiling point refrigerant, and is circulated through the throttling device 24 to the low pressure circuit of the refrigeration cycle B. However, it joins with the refrigerant passing through the expansion valve B18, and then flows through the refrigeration cycle B. The refrigerant that circulates has an increased concentration of R22, which is a low boiling point refrigerant. On the contrary, rectification separator 21
The liquid component that descends at high boiling point refrigerant concentration is circulated through the throttling device 23 to the low pressure circuit of the refrigeration cycle A, but it joins with the refrigerant passing through the expansion valve A13 to stop the refrigeration cycle A. The circulating refrigerant has an increased concentration of R12, which is a high boiling point refrigerant. Therefore, it is possible to increase the cooling capacity of the lower refrigeration cycle B. Furthermore, when the lower stage refrigeration cycle B is also subjected to heating operation (for example, hot water supply heating mode in winter), the four-way valve B1e in the refrigeration cycle B is switched, and the water passes through the water side heat exchanger B17, which acts as a condenser. A part of the refrigerant is depressurized to some extent by the throttling device 24 and becomes a gas-liquid two-phase state, and in particular, the liquid component descends from the top of the rectification separation N21. Therefore, in this case as well, a rectification effect occurs due to the interaction with refrigeration cycle A, which is operated in the same way. When the concentration of a certain R12 increases, the water-side heat exchangers A14 and B17 exchange heat to raise the temperature of the hot water supply, and hot water supply and heating operation becomes possible. Note that when only the refrigeration cycle B is operated (for example, heating priority mode in winter), the refrigeration cycle A side acts as a reservoir for surplus refrigerant, and the refrigeration cycle B is operated with the concentration of the enclosed mixed refrigerant unchanged.

Next, the refrigeration cycle device according to the present invention will be described using an example in which the refrigeration cycle device according to the present invention is applied to an air-conditioning device that has a need to temporarily increase the blowout temperature in heating mode. In Figure 3,
Compressor A31, four-way valve A32, load-side heat exchange WA that acts as a condenser or evaporator by switching four-way valve A32
33, an expansion valve A34 that acts to reduce pressure, a switching four-way valve A32, a heat source side heat exchanger A35 that acts as an evaporator or a condenser, etc. are connected to form the upper refrigeration cycle A. In addition, the compressor Ba6, the load side heat exchanger B37 that always acts as a condenser, the expansion valve B38 that acts as a pressure reduction,
A lower refrigeration cycle B is constructed by connecting the heat source side heat exchanger B39, which always acts as an evaporator. Here, the heat source side heat exchanger A35 on the upper stage side and the load side heat exchanger B37 on the lower stage are integrally formed as an air heat exchanger 40, and are capable of direct heat exchange, as well as a circulation fan (not shown). ) and also exchanges heat with the air. Furthermore, the rectification separator 41 is sandwiched between the bottom part and the expansion valve A34 of the refrigeration cycle A on the upper stage side.
The top is connected to the lower refrigeration cycle B.
The expansion valve Bss is bypassed and connected via the throttle device 44,45.

In such a refrigeration cycle device, when a non-azeotropic mixed refrigerant consisting of a high boiling point refrigerant and a low boiling point refrigerant is sealed, normal heating and cooling operation is performed only in the refrigeration cycle A. Next, when you want to temporarily raise the blowout temperature during the start-up of the heating mode, if you also operate the refrigeration cycle B at the same time, a rectification effect will occur in the same way as in the hot water supply heating mode of the embodiment shown in Fig. 1. The heat source side heat exchanger A35 in which the boiling point refrigerant circulates and the load side heat exchanger B37 in which the low boiling point refrigerant circulates exchange heat, and the blowing temperature in the upper load side heat exchanger 33 can be raised to a high temperature. .

The embodiments shown in FIGS. 1 and 3 show an example of a method of connection with a rectification separator, and include a variable throttling device and additional means for promoting the rectification action. The present invention also includes additions of the following, and the application is not limited to the embodiments, and it goes without saying that the present invention may be applied to ultra-low temperature equipment and the like.

Effects of the Invention As described above, the refrigeration cycle device according to the present invention is not an idiot that can achieve a high temperature in the upper condenser and a low temperature in the lower evaporator, but can perform rectification separation. When not in use, it is possible to increase or decrease the capacity for economical operation.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a refrigeration cycle device according to an embodiment of the present invention applied to an air-conditioning/heating/water supply system, Fig. 2 is a block diagram of a conventional air-conditioning/heating/water supply system, and Fig. 3 is a block diagram of a refrigeration cycle system according to an embodiment of the present invention. FIG. 2 is a configuration diagram in which a tickle device is applied to an air-conditioning device. 11.15...Compressor, 12...Hot water supply heat exchanger, 14,17...Water side heat exchanger, 1
9... Air side heat exchanger, 13.18...
- Expansion valve, 21... Rectification separator, 22.23.
24.25...Shibori! 7 devices. Name of agent: Patent attorney Toshio Nakao and 1 other person22
．． 2j, 24.25-Aperture shell placement Fig. 1 Fig. 2 ゝ9

Claims (1)

[Claims] The upper refrigeration cycle is equipped with a compressor, condenser, pressure reduction device, evaporator, etc., the lower refrigeration cycle is also equipped with a compressor, condenser, pressure reduction device, evaporator, etc., and a rectification separator. as main components, the bottom of the rectification separator is connected by bypassing the pressure reducing device of the upper refrigeration cycle, and the top of the rectification separator is connected by bypassing the pressure reducing device of the lower refrigeration cycle, A refrigeration cycle characterized in that the evaporator of the upper refrigeration cycle and the condenser of the lower refrigeration cycle directly or indirectly exchange heat, and a non-azeotropic mixed refrigerant consisting of a low boiling point refrigerant and a high boiling point refrigerant is sealed. Device.