JPH0244131A - Cooler-heater - Google Patents

Abstract

PURPOSE:To enable reductions in a piping time and in a piping space by connecting an exterior unit and an interior unit to each other by one double pipe. CONSTITUTION:In a heating operation, a refrigerant cycle is established. In the refrigerant cycle on the heat source side, a high-temperature high-pressure refrigerant from a compressor 13 is fed through a four-way valve 14 to a first auxiliary heat exchanger 20, where it is condensed into a liquid by releasing heat. The liquefied refrigerant is decompressed while being fed through a check valve 19 into a heating decompressor 17, is then evaporated through heat absorption in an exterior heat exchanger 15, and the evaporated refrigerant is circulated through the four-way valve 14 to the compressor 13. In this case, a second auxiliary heat exchanger 12 in the refrigerant cycle on the utilization size exchanges heat with the heat exchanger 20, whereby a refrigerant on the utilization size is evaporated through heating, and the refrigerant with less liquid is passed through an annular refrigerant passage (c) in a double pipe to a heat exchanger 24 on the utilization side, where it is liquefied through releasing heat, thereby heating. The resultant liquid-rich refrigerant is passed through a central refrigerant passage c' in the double pipe to a refrigerant feeder 23, and is recirculated through a refrigerant quantity regulating tank 22 to the heat exchanger 21. In this case, as in the case of cooling, there is little difference in refrigerant temperature or pressure between the annular passage (c) and the central passage c' in the double pipe, and only a difference in dryness exists therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to heating and cooling systems, and particularly to refrigerant piping.

BACKGROUND OF THE INVENTION Conventionally, the refrigerant cycle of a heating and cooling system has been constructed as shown in FIG. In Fig. 3, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a cooling pressure reducing device, 5 is a heating pressure reducing device, and 6 is a check that bypasses the cooling pressure reducing device 4 during heating. A valve 7 is a check valve that bypasses the pressure reducing device 5 for heating during cooling, and 81 is an indoor heat exchanger. These are connected in an annular manner by a source side pipe 9 and a gas side pipe 10 to form a refrigerant cycle. There is.

In addition, Fig. 4 shows the heat insulation specifications of the source side piping 9 and the gas side piping 1o.
0 is a heat insulating material that heats and insulates the source pipe 9 and the gas side pipe 10'f, which are insulated by the heat insulating material 1-1, and a cover 12 that is pressed together.

The operation of the heating and cooling system configured as described above will be explained below.

During cooling operation, the refrigerant cycle is shown by the solid line arrow in the figure, and the high-temperature, high-pressure refrigerant from the compressor 1 passes through the four-way valve 2, radiates heat in the outdoor heat exchanger 3, condenses and liquefies, and passes through the check valve 7 and the source pipe 9. The refrigerant is then depressurized in the cooling pressure reducing device 4 and evaporated in the indoor heat exchanger 8 to become a low-pressure low-temperature refrigerant, which is circulated through the gas side pipe 10 and the four-way valve 2 to the compressor 1.

On the other hand, during heating operation, the refrigerant cycle is as indicated by the broken line arrow in the figure, and the high-temperature, high-pressure refrigerant from the compressor 1 is sent from the four-way valve 2 to the indoor heat exchanger 8 through the gas side pipe 10'e, where it radiates heat and condenses. It liquefies into a medium-temperature, high-pressure refrigerant, passes through the check valve 6 and the source pipe 9, is depressurized by the heating pressure reducing device 5, is endothermically evaporated in the outdoor heat exchanger 8, and is circulated through the four-way valve 2 to the compressor 1.

Problems to be Solved by the Invention However, in the above configuration, the temperature difference between the source side piping and the gas side piping is very large. The piping and the gas side piping exchange heat, which caused problems such as the compressor suction gas overheating during cooling, and the compressor burning out.

Furthermore, during heating, heat exchange between the source side piping and the gas side piping causes problems such as a decrease in heating capacity. For this reason, it is necessary to insulate the source side piping and the gas side piping with separate insulation materials and combine them into one, which is very difficult to construct, and if the distance of the connecting piping is long, the connecting piping Construction is very expensive and
In the case of installing multiple units, there was a problem in that the connection piping space became extremely large.

In view of the above-mentioned problems, the present invention provides an air-conditioning system that allows connection piping work to be performed at low cost even if the distance of the connection piping is long, and that requires less space for connection piping even when multiple units are installed. .

Means for Solving the Problems In order to solve the above problems, the air conditioning system of the present invention includes a heat source formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, a pressure reduction device, and a first auxiliary heat exchanger in an annular manner. side refrigerant cycle;
A second auxiliary heat exchanger is formed integrally with the first auxiliary heat exchanger to exchange heat.
An outdoor unit including a user-side refrigerant cycle in which an auxiliary heat exchanger, a refrigerant transport device, and an indoor heat exchanger are connected in a ring, a heat source-side refrigerant cycle, a second auxiliary heat exchanger of the user-side refrigerant cycle, a refrigerant transport device, etc. and an indoor unit equipped with an indoor heat exchanger etc. are connected by double pipes.

Operation The present invention reduces the number of connecting pipes connecting the outdoor unit and the indoor unit by the above-described configuration.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

In Fig. 1, 13 is a compressor, 14 is a four-way valve, 15 is an outdoor heat exchanger, 16 is a cooling pressure reducing device, 17 is a heating pressure reducing device, and 18 is an inverter that closes the cooling pressure reducing device 16 during heating. A stop valve 19 is a check valve that closes the heating pressure reducing device 17 during cooling, and 20 is a first auxiliary heat exchanger, which are connected in an annular manner to form a heat source side refrigerant cycle. A second auxiliary heat exchanger 21 is integrally formed to exchange heat with the first auxiliary heat exchanger 20. 22 is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating. Reference numeral 23 denotes a refrigerant conveying device which has a reversible characteristic such that the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the outdoor unit a. 24 is an indoor heat exchanger that is housed in indoor unit b, and 25 is a double pipe that connects outdoor unit a and indoor unit b.
f! :Connected. The second auxiliary heat exchanger 21, the refrigerant amount adjustment tank 22, the refrigerant conveyance device 23, and the indoor heat exchanger 2
4 and the double pipe are connected in an annular manner to form a user-side refrigerant cycle.

FIG. 2 shows a perspective view of the double pipe in this embodiment.

The operation of the heating and cooling system configured as described above will be described below.

During cooling operation, the refrigerant cycle is indicated by the solid line arrow in the figure. In the heat source side refrigerant cycle, the high-temperature, high-pressure refrigerant from the compressor 13 passes through the four-way valve 14, radiates heat in the outdoor heat exchanger 15, condenses and liquefies, and closes the check valve 18. The air is then depressurized in the cooling pressure reducing device 16, evaporated in the first auxiliary heat exchanger 20, and circulated through the four-way valve 14 to the compressor 13. At this time, the second auxiliary heat exchanger 21 of the user-side refrigerant cycle and the first auxiliary heat exchanger 20 exchange heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied.
It becomes a multi-liquid state and passes through the refrigerant amount adjustment link 22,
The refrigerant 3 in the inner pipe of the double pipe is transported by the refrigerant conveying device 23.
It is sent to the refrigerant path C' in the indoor heat exchanger 24, where it undergoes endothermic evaporation, cooling, and gasification into a small liquid state. second auxiliary heat exchanger 21
It will be circulated. At this time, there is almost no difference in temperature or pressure of the refrigerant between the refrigerant passage C' in the inner pipe of the double pipe and the refrigerant passage C in the outer pipe of the double pipe, but there is a difference in dryness. .

On the other hand, during heating operation, the refrigerant cycle is indicated by the dashed arrow in the figure, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1;
It is sent to 0, heat is radiated and condensed and liquefied, the pressure is reduced from the check valve 19 to the heating pressure reducing device @ 17, the heat exchanger 15 absorbs heat and evaporates, and it passes through the four-way valve 14 to the compressor 13. circulate. The second auxiliary heat exchanger 21 of the refrigerant cycle on the user side and the first auxiliary heat exchanger 20 exchange heat [-C) The refrigerant in the refrigerant cycle on the user side is heated and gasified to a low liquid state. The refrigerant is then sent to the user-side heat exchanger 24 through the refrigerant passage C in the outer pipe of the double pipe. /Heating is performed and the liquid becomes a multi-liquid state, which is sent to the refrigerant conveying device 23 through the refrigerant passage C' inside the double pipe. From the adjustment tank 22 to the second auxiliary heat exchanger 21. At this time, as well as during cooling, the refrigerant passage C in the pipe outside the double pipe
In the refrigerant passage C' in the inner pipe of the double pipe, there is almost no difference in temperature and pressure between the refrigerants, but there is a difference in the degree of stiffness IS'.

As shown in 1- above, in the heat-source embodiment (A7i), since the refrigerant cycle is separated into two refrigerant cycles, the heat source side refrigerant cycle and the user-side refrigerant cycle, the indoor heat exchanger and outdoor unit of the user-side refrigerant cycle are Since there is almost no difference in temperature or pressure between the refrigerant in the refrigerant passage inside the connecting double pipe and the refrigerant passage in the outside pipe of the double pipe, the refrigerant in both passages can exchange heat with each other. Therefore, the suction gas of the compressor does not get superheated, and the inside and outside of the double pipe can be cooled. Time and piping space can be reduced.

Effects of the Invention As described above, the present invention includes a second auxiliary heat exchanger for a heat source side refrigerant cycle and a user side refrigerant cycle, a refrigerant conveying device, etc., an outdoor unit, an indoor heat exchanger, etc. , Indoor unit 9″: -Tsuto and existing, -connected with two double pipes l no 1
5 pipes, it has the effect of shortening the time for piping work and reducing the piping space.

[Brief explanation of the drawing]

No. 1 is a refrigeration cycle diagram of a heating and cooling system according to an embodiment of the present invention, FIG. 2 is a perspective view of a double pipe according to an embodiment of the invention, and FIG. 3 is a diagram of a refrigeration cycle of a heating and cooling system according to a conventional example. , FIG. 4 is a cross-sectional view showing the heat insulation specifications of a conventional connecting pipe. 13... Compressor, ], 4... Four-way valve, 15... Outdoor heat exchanger, 16.17... Pressure reducing device, 20... First auxiliary heat exchanger, 21... No. 2 auxiliary heat exchanger, 23.
・・Refrigerant conveyance device, 24 ・・Indoor heat exchanger, Qp O
'... Refrigerant passage, 25... Connection piping. 1 (', Attorney's name on the patent attorney Awano Nailskin 1 idiot/
3-1-ru shocho/, j--Yoyukata ki/, 5--Goto Netsu-Hani! Miya, Figure 1 Bar - Arrival 11 Kidney A2-1 - Bean j Kumuni L2, To

Claims (1)

[Claims] A heat source side refrigerant cycle consisting of a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger connected in an annular manner; a user-side refrigerant cycle in which two auxiliary heat exchangers, a refrigerant transport device, and an indoor heat exchanger are connected in an annular manner; a second auxiliary heat exchanger of the heat source-side refrigerant cycle and the user-side refrigerant cycle;
A heating and cooling device characterized in that an outdoor unit equipped with a refrigerant conveyance device and an indoor unit equipped with an indoor heat exchanger, etc. are connected through a double pipe.