CN201014816Y - Double cycle solar water heater storage tank - Google Patents

Abstract

The utility model relates to a double-circulation solar water heater heat storage tank. It is mainly composed of a water tank liner, an insulation layer, an outer shell and a heat exchange core installed in the liner. Its characteristic is that the heat exchange core is connected with the inner tank through the flange plate welded on the inner tank and can be disassembled for maintenance and cleaning of the water tank. The heat exchange core is welded by sleeve shell, head and chassis. The utility model is mainly used for manufacturing various double-cycle pressurized solar water heaters.

Description

Double cycle solar water heater storage tank

Technical field

The utility model belongs to a solar water heater hot water storage tank

Background technique

At present, the vast majority of household solar water heaters in my country use a single-cycle system, that is, the heated water in the solar collector directly enters the water storage tank for use. Although this single-cycle system has a simple structure and low manufacturing cost, it is difficult to avoid the accumulation of scale in the channel of the heat collector or in the vacuum heat collecting tube. After scaling, it will not only reduce the performance of the solar water heater, but also block the channel of the heat collector. As a result, it cannot be used, and it is difficult to prevent the water in the collector from freezing and causing the heat absorbing body to freeze in cold regions in winter. In order to prevent freezing and anti-scaling, the secondary heat exchange system is widely used in the world, that is, a heat exchanger is added between the heat collector and the hot water storage tank to form two reliable isolated circulation loops. A non-freezing heat transfer working fluid is added to the heat collection circuit, and the heat transfer working medium heats domestic water through the heat exchanger. The separation of heat collection circuit and domestic water circuit has become the basic requirement and development trend of solar water heaters. Our country is gradually developing and improving in this area, but there are no suitable heat exchangers and hot water storage tanks at present. The country has not yet formulated corresponding standards. According to the introduction of the fourth issue of solar energy in 2006, there are currently welded metal spiral pipes or coils in the hot water storage tank. This structure has a large resistance to the flow of working fluid and is not suitable for natural circulation systems, and it is not easy to repair and clean. The water tank liner is made into a double-layer structure. Although this structure has a large heat exchange area, it requires a lot of materials, a large amount of welding, and high manufacturing costs.

Contents of the invention

The purpose of this utility model is to provide a hot water storage tank suitable for manufacturing double-circulation solar water heaters. A detachable heat exchange core is installed in the hot water storage tank, and the circulation resistance is small, which is convenient for maintenance and cleaning.

In order to achieve the above purpose, the utility model hot water storage tank is composed of an inner tank, an insulating layer, an outer shell and a heat exchange core installed in the inner tank. Open a hole and weld a flange at the end of the inner tank of the hot water storage tank or on the inner tank body to install the heat exchange core. The heat exchange core is welded by the sleeve tube, the head and the chassis. The circulation guide pipe and the exhaust pipe are welded on the chassis. There are threaded joints at the end of the pipe for connecting the circulation pipeline.

Because the utility model adopts a detachable assembly structure, the heat exchange core and the water tank can be assembled separately through specialized production, which is convenient for quality inspection and maintenance. Since the heat exchange core adopts the shell tube structure, the volume is small, and the circulation resistance of the working medium is small, so it is suitable for manufacturing water heaters with natural circulation. Since the solar heat collection circuit is separated from the domestic water circuit, the heat collection circuit can use non-freezing working fluid, which can completely solve the scaling and freezing problems of solar water heaters, and fundamentally improve the performance of solar water heaters, which is conducive to the popularization and application of solar water heaters . +

Description of drawings

Fig. 1 is an assembly drawing of the utility model, and Fig. 2 is a sectional view of A-A of Fig. 1 . Fig. 3 is a front view of the heat exchange core, and Fig. 4 is a view taken along the direction B of Fig. 3 .

In the figure 1 shell, 2 insulation layer, 3 liner, 4 hot water outlet pipe, 5 heat exchange core, 6 flange, 7 screw, 8 heat exchange core chassis, 9 gasket, 10 water inlet pipe, 11 water inlet pipe joint , 12 hot water outlet pipe joint, 13, exhaust pipe, 14 diversion pipe, 15 diversion pipe joint, 16 exhaust pipe joint, 17 circulation outlet pipe joint, 18 heat exchange core head, 19 fins, 20 exchange Heat core shell.

Detailed ways

The utility model is mainly made up of water tank liner 3, heat preservation 2, shell 1, heat exchange core 5. On the lower head of the water tank liner 3, a hole is welded to the flange 6, and the heat exchange core chassis 8 is fixed on the liner flange 6 with screws 7, so that the heat exchange core is placed in the middle of the water tank liner 3. There is a gasket 9 between the flange plate 6 and the heat exchange core chassis 8 to form a good seal. Allow the tank to withstand tap water pressure. Welded with water inlet pipe joint 11 on the lower head of water tank liner, outlet hot water pipe joint 12, outlet hot water pipe 4 is housed on the outlet hot water pipe joint and stretches to the water tank top.

The heat exchange core is welded by a cylindrical heat exchange core shell 20 covered with fins 19, a head 18 and a heat exchange core chassis 8, and a flow guide tube 14, a joint 15, and a circulation outlet pipe joint 17 are welded on the chassis 8 And the exhaust pipe 13, the exhaust pipe joint 16, the outlet of the exhaust pipe are higher than the outlet of the draft pipe, so that the circulating working medium liquid level is higher than the outlet of the draft pipe during normal operation and the circulation will not be interrupted.

The heat exchange core is connected with the solar heat collector through a circulation pipeline to form a common heat collection path. A non-freezing working fluid is added to the heat collection circuit. The working medium is heated in the solar collector, the temperature rises, and the density drops through the circulation pipeline to rise to the outlet of the draft tube and flow out into the heat exchange core shell to pass the heat through. After the shell wall of the heat exchange core is passed to the surrounding water, the temperature decreases and the density increases, and the working fluid drops and flows back to the heat collector through the outlet to form a natural circulation of the heat collection circuit.

The hot water storage tank enters the water pipe joint 11, and the hot water outlet pipe joint 12 is connected with the tap water pipe and the water system respectively. During operation, the tap water inlet valve is normally open, and the hot water outlet valve is normally closed. When the tap water supply pressure is normal, the water tank is always filled with tap water, and the heat obtained by the solar collector is transferred to the surrounding cold water through the heat exchange core. , As the water temperature rises and the density decreases, hot water floats upwards, and relatively low-temperature water flows downwards to form a natural cycle of convective heat exchange. The water is continuously heated and stored in the water tank.

When hot water is used, as long as the hot water valve is opened, the hot water on the top of the water tank is pushed out from the hot water pipe by the running water entering from the bottom, and it can be used for various purposes the same as running water. When needed, unscrew the connecting screw to remove the heat exchange core for inspection and cleaning of the water tank.

The utility model can be used to manufacture various double-cycle pressurized solar water heaters. The hot water storage tank can be compactly installed together with the solar heat collector and placed outdoors, or can be installed separately, and the hot water storage tank can be installed indoors.

Claims (2)

1. two circulating solar energy water heater heat storage water tanks are made up of shell, heat-insulation layer, inner water tank and heat exchange core, it is characterized in that perforate welding flange on inner water tank, heat exchange core chassis is connected with the inner bag ring flange with screw, and the heat exchange core is placed in the middle of the inner water tank.

2. water tank according to claim 1 is characterized in that the heat exchange core is welded with the pipe, end socket and the chassis that are with fin, is welded with circulation mozzle and blast pipe on the chassis, and pipe end has nipple.

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