Bursting preventive shell tube structure and water heater

Abstract

The invention discloses a bursting preventive shell tube structure and a water heater. The bursting preventive shell tube structure comprises a shell, a copper tube in the shell, a tube plate and a vessel head, wherein an opening is formed in one end of the shell; the tube plate is arranged at the opening of the shell; the tube plate is covered with the vessel head; a cavity between the tube plateand the vessel head is divided into a water flowing space and a compensation space by an elastic separating piece; and the copper tube communicates with the water flowing space. The bursting preventive shell tube structure is provided with the compensation space, so that under the low temperature condition, the compensation space can be provided for the increased size formed after water freezes to reduce the risk that the copper tube bursts.

Description

technical field [0001] The invention relates to the field of commercial air-energy water heaters, and more specifically relates to an anti-expansion shell and tube structure and a water heater. Background technique [0002] At present, most commercial air-energy water heaters on the market use flooded shell tubes to make hot water. The working principle of the flooded shell and tube is that the high-temperature and high-pressure cold coal flows in the shell, and the water to be heated flows in the copper tube, and the two exchange heat energy to achieve the result of heating the water. The advantage of this heating method is that it has good heat exchange effect, high energy efficiency, simple structure and low price. [0003] However, such flooded shells also have some disadvantages. In a low temperature environment, the copper tube may break. When the air energy water heater is defrosting below 0°C, the temperature of the flooded shell tube is lower than the ambient temp...

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Problems solved by technology

[0003] However, this flooded shell also has some disadvantages

In a low temperature environment, the copper tube may break. When the air energy water heater is defrosting below 0°C, the temperature of the flooded shell tube is lower than the ambient temperature. At this time, the water flow is too small, which will cause As a result of freezing, the volume of frozen water will increase, but the temperature of the copper tube will decrease, which may cause the risk of cracking the copper tube; in addition, when the flooded shell tube is not in use, the residual water will freeze due to unclean drainage The above situation will also occur, the copper pipe may crack

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