Backwater valves and water heaters for water heaters

Abstract

The invention discloses a water return valve for a water heater and a water heater. The water return valve is switchable between a first working state and a second working state and includes: a valve body, the valve body having a first flow channel, The second flow path and the flow-limiting flow path, the flow-limiting flow path communicates with the first flow path and the second flow path respectively; the flow-limiting valve, at least a part of the flow-limiting valve is in the full-flow position and the flow-limiting position Positions are movably arranged in the flow-restricting channel, and in the first working state, the flow-limiting valve moves to the full-flow position to control the maximum opening of the flow-limiting channel. In the second working state, the flow-limiting valve moves to the flow-limiting position to control the opening of the flow-limiting channel to be minimum. According to the return water valve of the present invention, by controlling the opening of the flow-limiting flow channel, the return water flow rate can be guaranteed during the cycle preheating, and the pressurization effect can be ensured when the water is used at low water pressure. The same applies to water heaters and those without a return line.

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. boost 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 the e...

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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