JPH0221507B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating and cooling system that performs heating and cooling using a cold cycle of a refrigerant, and particularly to a heating and cooling system that improves the heating effect by indirectly heating a refrigerant using an auxiliary heat source such as a boiler. It is related to.

2. Description of the Related Art Generally, it is known that in order to improve the heating effect of equipment that performs heating and cooling using a cooling/heating cycle of a refrigerant, the refrigerant is heated by an auxiliary heat source during heating. If the refrigerant is directly heated, it will be locally abnormally heated due to uneven heating, etc., resulting in damage such as decomposition and deterioration of the heating medium. Therefore, it has been considered to heat this heating medium indirectly using a boiler or the like. That is, a heat exchanger pipe coil of a heat medium is loaded into the boiler's body, and the heat exchanger pipe coil is indirectly heated by hot water inside the body.

In this heating and cooling system, the boiler unit and the outdoor unit are usually separated, resulting in the problem of complicated piping and the like. Moreover, the surface temperature of the boiler mentioned above is 40 to 50 degrees Celsius, and the heat radiation loss is large, approximately 5% for boilers with a combustion rate of 3000 to 6000 kcal/n.
~10% is heat radiation loss, which is a major factor that reduces the efficiency of the entire system. For this reason, the boiler unit is usually covered with glass wool to insulate it, but this is not desirable from the viewpoint of workability and cost.

The present invention has been made in view of the above problems, and one embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows outdoor unit 1 installed outdoors.
FIG. 3 is a piping diagram of a separate type air-conditioning system in which the air conditioner 3 and an indoor unit 12 installed indoors are separated and connected through a connecting pipe 11. The outdoor unit 13 is equipped with the compressor 1, the outdoor coil 9, the accumulator 5, the four-way valve 6, the boiler unit 2, the expansion mechanism 8, the check valve 7, and the two-way valve 14, and the indoor unit 12 An expansion mechanism (not shown) and an indoor coil 10 which functions as an evaporator during cooling and a condenser during heating are installed inside. These devices are connected to each other by refrigerant piping.

During cooling, the refrigerant discharged from the compressor 1 flows in the direction of the broken line arrow in FIG. It is sent to coil 10. Here, the pressure is further reduced by an expansion mechanism (not shown) built into the indoor unit 12, evaporated by the indoor coil 10, and returned to the compressor 1 via the connecting pipe 11 for cooling by a refrigeration cycle. . In the refrigerant circulation path configured as described above, a branch path 40 is provided midway between the expansion mechanism 8 and the indoor unit 12, and a two-way valve 14 and a boiler unit 2 for heating the refrigerant are provided on the suction side of the compressor 1. There is. An accumulator 5 is provided on the suction side of the compressor 1 to store liquefied refrigerant immediately before suction, and serves to prevent liquefied refrigerant from being directly sucked into the compressor 1 when vaporization is insufficient.

During heating, the four-way valve 6 controls the refrigerant to flow as indicated by the solid arrow in FIG. 1, forming a heating refrigerant circulation path. That is, the refrigerant heated by the boiler unit 2 is sucked into the compressor 1 via the accumulator 5, sent to the indoor unit 12 by the four-way valve 6, where it is condensed and liquefied, the heat of condensation is radiated, and the liquefied refrigerant is recycled again. Heating is performed by returning the water to boiler unit 2. As shown in FIG. 2, the boiler unit 2 has an air reservoir 51 in the upper part, an antifreeze liquid made of ethylene glycol, propylene glycol, etc. is sealed in the inner lower part as a heat medium 15, and a can body has a combustion chamber 26 in the center. 2
0, a burner 4 using gas or oil as a heat source,
It is composed of a hot water temperature thermistor 27 for detecting the hot water temperature, and a coil-shaped heating coil 3 arranged so as to be immersed in the antifreeze liquid 15 inside the can body 20.

Further, as can be seen from FIG. 1, the boiler unit 2, the compressor 1, the outdoor coil 9, the blower 44 that blows air to the outdoor coil 9, the expansion mechanism 8, the four-way valve 6, the two-way valve 14, and the check valve 7. The accumulator 5 is arranged close to each other within the box 41 to form a unit.

In Fig. 2, 16 is a cylindrical combustion tube;
17 is a screw for mounting the burner 4, 18 is an exhaust gas discharge port, 19 is a cylindrical inner shell, 22 is a refrigerant inlet, 2
3 is a refrigerant outlet, and 24 is a lid of a heat medium supply port 25 made of a pipe. This lid 24 may be configured with a safety valve or the like that opens when abnormal pressure rises.

Figure 3 shows the specific arrangement inside the box 41. The boiler unit 2, compressor 1, and accumulator 5, which have high surface temperatures, are arranged in close proximity to each other so that they have good heat insulation and heat shielding properties. 2, except for the air supply and exhaust ports 43 and 45, are covered with an inner case 42 to reduce convection near the boiler unit 2, compressor 1, and accumulator 5, thereby reducing heat loss due to heat radiation from the surface. Efficiency is increased by allowing the compressor 1 and accumulator 5, which are disposed near the boiler unit 2 whose surface temperature is highest, to absorb heat. Furthermore, these are covered with a box 41 to further enhance the effect.

Although not shown in Fig. 3,
The expansion mechanism 8, the four-way valve 6, the two-way valve 14, and the check valve 7 are provided outside the inner box 42 on the outdoor coil 9 side.

As is clear from the above description, according to the present invention, by arranging the boiler unit, which has the highest surface temperature among the equipment constituting the air conditioning system, in the box together with the compressor, outdoor coil, blower, etc.
It is possible to shorten the length of refrigerant piping that connects equipment and eliminate connecting members such as flare bolts and flare nuts. Furthermore, by providing an inner box inside the box and arranging the boiler unit, compressor, and accumulator inside this inner box, heat convection within the box can be reduced.
Heat radiation from the surface of the boiler unit can be reduced, and the compressor and accumulator absorb heat, improving system efficiency.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a heating and cooling device according to an embodiment of the present invention, FIGS. 2a and 2b are a front sectional view and a side sectional view of the same device, and FIG. 3 shows a specific arrangement inside the case of the present invention. FIG. 1... Compressor, 2... Boiler unit, 5...
Accumulator, 6...Four-way valve, 7...Check valve,
9...Outdoor coil, 14...Two-way valve.

Claims (1)

[Claims] 1. A boiler unit that uses gas or oil as a heat source to heat the refrigerant, a compressor that compresses the refrigerant, an outdoor coil through which the refrigerant flows, an expansion mechanism, a four-way valve, a two-way valve, a check valve, and an accumulator. and an air blower for blowing air to the outdoor coil, which are arranged in a box, an inner box is provided in the box, and the boiler unit, the compressor, and the accumulator are arranged in the inner box.