Water flow sensor and fuel gas water heater

Abstract

The invention discloses a water flow sensor and a fuel gas water heater. The water flow sensor comprises a shell. The shell is provided with a Hall flowmeter component. A pressure relief channel is arranged on the shell, the pressure relief channel has a left section and a right section, a piston is arranged in the pressure relief channel, the piston is arranged between the left section and the right section, the left section is connected with an inner cavity of the shell, an elastic component is arranged in the right section. A right side of the right section is provided with an end cover, the end cover is detachably connected to the shell, and the end cover is provided with a venting port. When water in a waterway of the fuel gas water heater freezes and expands outwardly, because a freezing process is a slow process, an ice cube is squeezed towards the piston, the squeezed piston moves to the right, air in the right section is vented to the outside air through the venting port, an enough space is released for the expanded ice cube so as to prevent the shell from being frosted and cracked or the Hall flowmeter component from being damaged, and a protection effect can be achievedunder a condition that the water heater is power off.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to a water flow sensor and a gas water heater. Background technique [0002] In winter, due to the rapid drop in temperature, when the water in the waterway of the gas water heater freezes, the ice cubes will expand outwards, causing damage to the components of the waterway, and in severe cases, it will cause the components of the waterway to freeze and crack; most of the current market Most of the gas water heaters do not have anti-freeze crack structure, usually through artificial drainage to play a protective role, while gas water heaters with anti-freeze crack usually use an anti-freeze heating body on the water pipe or control it under the action of the water pump through the program. Circulate the water flow inside. These solutions still have many loopholes and deficiencies in actual operation. For example, the parts of the water heater tank or the waterway are froz...

AI Technical Summary

Problems solved by technology

[0002] In winter, due to the rapid drop in temperature, when the water in the waterway of the gas water heater freezes, the ice will expand outwards, causing damage to the components of the waterway, and in severe cases, it will cause the components of the waterway to freeze and crack; most of the current market Most gas water heaters do not have antifreeze cracking structures, and are usually protected by artificial drainage, while gas water heaters with antifreeze cracking usually use antifreeze heating elements on the water pipes or are controlled by programs under the action of water pumps. circulate the water inside

These solutions still have many loopholes and deficiencies in actual operation. For example, the parts of the water heater tank or the waterway are frozen and cracked due to the user’s power failure, forgetting to drain water, etc., and because there are many precision parts in the water flow sensor. Flow sensors are especially vulnerable to damage from water freezing in the waterway

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