Safety valve with expansion function and electric water heater

Abstract

The invention discloses a safety valve with an expansion function. The safety valve comprises a valve body, a connecting cavity formed in the valve body, an inner pressure relief cavity, an outer pressure relief cavity, an inner pressure relief module and an outer pressure relief module, wherein the inner pressure relief cavity and the outer pressure relief cavity communicate with the connecting cavity, the inner pressure relief module is installed in the inner pressure relief cavity, and the outer pressure relief module is installed in the outer pressure relief cavity. The safety valve is characterized in that a water storage cavity communicating with the connecting cavity is further formed in the valve body, an end face seal is arranged at one end of the water storage cavity, an expansion module is arranged in the water storage cavity, the expansion module comprises a partition plate which is arranged in the water storage cavity in a sliding mode and used for blocking water and an expansion spring used for connecting the bottom of the partition plate with the water storage cavity, and working pressure of the inner pressure relief module is smaller than that of the expansion module which is smaller than that of the outer pressure relief module. The expansion module is arranged to collect water from the water heater due to the heated expansion. When a user uses the water heaterfor discharging hot water, water stored in the water storage cavity is automatically discharged, water resources are saved, and the water dripping phenomenon of the safety valve is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of water control devices for electric water heaters, in particular to a safety valve with an expansion function and an electric water heater. Background technique [0002] After the electric water heater is heated, the water stored in the liner expands, causing the safety valve to drip, which has always been a problem in the electric water heater industry, and has always occupied the top three positions in the industry's maintenance rate. Because the inner tank is a closed pressure vessel, after the water is filled, the electric heater will work, and the water density will shrink with the increase of temperature, resulting in the continuous increase of the inner tank water volume, while the inner tank volume remains unchanged, the existing safety valve structure only It can carry out internal and external pressure relief. When the inner tank water of the electric water heater is released into the tap water p...

AI Technical Summary

Problems solved by technology

Because the inner tank is a closed pressure vessel, after the water is filled, the electric heater will work, and the water density will decrease with the temperature rise, causing the water volume of the inner tank to continue to increase, while the inner tank volume remains unchanged. The existing safety valve structure only It can carry out internal and external pressure relief. When the inner tank water of the electric water heater is released into the tap water pipeline and the pressure can no longer be relieved, it can only be discharged from the external discharge port of the safety valve, resulting in waste of water resources; when the pressure When it remains high, the safety valve even keeps dripping water, which will intuitively give the user a false impression of the water heater leaking, affect the user experience and cause incomprehensible user complaints and require replacement or repair of the safety valve

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