Dual-temperature zone heating once-through electric boiler

Abstract

A dual-temperature zone heating once-through electric boiler includes: a water collection pipe, at least one preheating pipe connected to the water collection pipe, at least one heating pipe connected to the preheating pipe, a collection pipe connected to the heating pipe, and a liquid level control unit for monitoring the liquid level in the heating pipe. Accordingly, through a segmented heating design of low-temperature preheating by the preheating pipe and high-temperature gas generation by the heating pipe, the liquid is preheated to a specified temperature by the first heater to reduce dissolved oxygen and prevent corrosion, and then reheated by the second heater. This two-stage heating process can significantly shorten the time for the liquid to be converted into a hot fluid, achieving energy saving and rapid start-up, and helping to improve energy efficiency. It also improves the problems of thermal shock and scaling that are prone to occur in traditional electric boilers, and enhances the overall durability of the equipment.

Claims

1. A once-through electric boiler with dual-temperature zone heating, comprising: A water collection pipe has an inlet end and at least one outlet manifold extending along the direction of the water collection pipe. The inlet end is connected to a water inlet motor, which guides liquid into the water collection pipe according to a water supply signal. At least one preheating pipe has an inlet manifold and a guide manifold. The inlet manifold is connected to the outlet manifold of the water collection pipe, and the preheating pipe is erected vertically to the water collection pipe. A first heater is installed inside the preheating pipe, which is activated according to a heating signal to preheat the liquid introduced into the preheating pipe and maintain it at a preheated temperature. At least one heating pipe has an inlet manifold and an outlet manifold. The inlet manifold and the guide manifold of the preheating pipe are connected by a conduit. A second heater is installed inside the heating pipe, which is activated according to a heating signal to heat the liquid entering the heating pipe to a predetermined temperature to form a hot fluid. A manifold has at least one inlet manifold and one outlet manifold. The inlet manifold is connected to the outlet manifold of the heating pipe via a hot fluid conduit, which further guides the hot fluid generated by the heating pipe into the manifold. The outlet manifold is connected to a downstream device to output the hot fluid for use. A drain manifold is provided at the bottom of the manifold, and the other end of the drain manifold is connected to the water collection pipe to return the liquid to the water collection pipe. A liquid level control unit is erected between the water collection pipe and the manifold, and the top of the liquid level control unit is flush with the top of the heating pipe to display and control the liquid level in the heating pipe.

2. The dual-temperature zone heating once-through electric boiler as described in claim 1, wherein, It includes a base for supporting the water collection pipe, the water inlet motor, the preheating pipe, and the heating pipe.

3. A once-through electric boiler with dual-temperature zone heating as described in claim 1, wherein, The water collection pipe system is provided with a plurality of outlet manifolds, and is equipped with a plurality of preheating pipes and a plurality of heating pipes corresponding to the number of preheating pipes. A plurality of outlet manifolds are arranged sequentially along the extension direction on one side of the outer circumference of the water collection pipe, and a plurality of support columns are arranged sequentially along the extension direction on the other side. The water collection pipe is also provided with a liquid level lower connector and a return manifold. The liquid level lower connector is connected to the bottom end of the liquid level control unit through a liquid level lower conduit, and the top end of the liquid level control unit is connected to the collection pipe through a liquid level upper conduit.

4. A once-through electric boiler with dual-temperature zone heating as described in claim 3, wherein, Each of the outlet manifolds of the water collection pipe is equipped with a water supply valve that connects to the inlet manifold of each of the preheating pipes. The inlet manifold is located in the lower half of the preheating pipe, while the guide manifold is located in the upper half of the preheating pipe. Each preheating pipe is also equipped with a drain valve at its bottom.

5. A once-through electric boiler with dual-temperature zone heating as described in claim 4, wherein, Each preheating pipe and each heating pipe is connected to the inlet manifold via a conduit. The inlet manifold is located in the lower half of the heating pipe, while the outlet manifold is located in the upper half of the heating pipe. Each conduit extends downward from the water outlet manifold in the upper half of the preheating pipe to the inlet manifold in the lower half of the heating pipe. Each heating pipe can be equipped with a control valve connected to the conduit. Furthermore, each heating pipe has a connecting post below the inlet manifold, which is used to fix it to the support post of the water collection pipe. Each heating pipe also has a drain valve at its bottom.

6. A once-through electric boiler with dual-temperature zone heating as described in claim 5, wherein, The manifold lies horizontally above the tops of each preheating pipe and each heating pipe, and its height is fixed by the drain manifold. The bottom of the manifold is provided with a plurality of inlet manifolds, each of which is connected to the outlet manifold of each heating pipe via a hot fluid conduit. The outlet manifold is located at the top of the manifold. The top of the manifold is further provided with a liquid level connector, a pressure relief valve port, and a pressure testing valve port. The liquid level connector is connected to the top of the liquid level control unit via the liquid level conduit. The pressure relief valve port and the pressure testing valve port are respectively provided with a pressure relief valve and a pressure valve assembly.

7. A once-through electric boiler with dual-temperature zone heating as described in claim 6, wherein, The manifold is symmetrically equipped with two baffles inside. The two baffles do not completely cover the inner diameter of the manifold, which has a flow channel and forms a water vapor condensation zone between the two baffles. The drain manifold is located between the two baffles. After the water vapor comes into contact and condenses, it drips to the bottom of the manifold and is discharged back.

Images