Water return valve for water heater and water heater

Abstract

The invention discloses a water return valve for a water heater and the water heater. The water return valve can be switched between a first working state and a second working state and comprises a valve body and a flow limiting valve, the valve body is provided with a first flow channel, a second flow channel and a flow limiting flow channel, and the flow limiting flow channel is in communicationwith the first flow channel and the second flow channel; at least one part of the flow limiting valve is movably arranged in the flow limiting flow channel between a full flow position and a flow limiting position, and in the first working state, the flow limiting valve moves to the full flow position so as to control the opening degree of the flow limiting flow channel to be maximum; and in thesecond working state, the flow limiting valve moves to the flow limiting position so as to control the opening degree of the flow limiting flow channel to be minimum. According to the water return valve, by controlling the opening degree of the flow limiting flow channel, the water return flow can be guaranteed during circulating preheating, the pressurization effect can be guaranteed during low-water-pressure water using, and the water return valve is also suitable for a water heater with a water return pipeline and a water heater without a water return pipeline.

Description

technical field [0001] The present invention relates to the technical field of water heaters, in particular to a return valve for a water heater and a water heater with the return valve for a water heater. Background technique [0002] The water heaters with circulation preheating function in the related art usually adopt DC water pumps with relatively large head (greater than 10m). In addition to being used for the circulation preheating function, the large lift water pump can also be used as a booster when bathing. boosting effect. However, since the water heater with circulation preheating function has a return water pipeline, when the user needs to pressurize when the water pressure is low (such as 0.01MPa-0.05MPa), the water resistance of the water pump sucked into the water inlet pipe will be relatively large under a certain flow rate. Large, so that a certain flow of water will be drawn back into the water pump in the built return water pipeline, which will reduce th...

AI Technical Summary

Problems solved by technology

However, since the water heater with circulation preheating function has a return water pipeline, when the user needs to pressurize when the water pressure is low (such as 0.01MPa-0.05MPa), the water resistance of the water pump sucked into the water inlet pipe will be relatively large under a certain flow rate. Large, so that a certain flow of water will be drawn back into the water pump in the return water pipeline built, which will reduce the effect of boosting

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