Water heating device

Abstract

A water heating device includes a first heating cavity and at least one second heating cavity provided side by side. A lower end of the first heating cavity and a lower end of each second heating cavity are respectively provided with a heater axially. A first connector connected to a water inlet pipe is arranged at an upper end of the first heating cavity, and is connected to an adjacent second connector through a bypass pipe. A second connector is arranged at an upper end of each second heating cavity, and adjacent second heating cavities are connected through the second connector. The lower end of the first heating cavity is connected to each second heating cavity through a communicating pipe. The second connector on a last second heating cavity along a water flow direction is communicated with a water outlet pipe.

What is claimed is: 
     
         1 . A water heating device, comprising:
 a first heating cavity; and   at least one second heating cavity;   wherein the at least one second heating cavity is provided side by side at a side of the first heating cavity; a lower end of the first heating cavity and a lower end of each of the at least one second heating cavity are each axially and insertedly provided with a heater; an upper end of the first heating cavity is provided with a first connector configured to allow water to pass through; an end of the first connector is connected to a water inlet pipe; an upper end of each of the at least one second heating cavity is provided with a second connector configured to allow water to pass through; the first connector is connected to the second connector of one of the at least one second heating cavity adjacent to the first connector through a bypass pipe; the lower end of the first heating cavity is communicated with each of the at least one second heating cavity through a communicating pipe provided on a side of the lower end of the first heating cavity; and the second connector on a last one of the at least one second heating cavity along a water flow direction is communicated with a water outlet pipe.   
     
     
         2 . The water heating device of  claim 1 , wherein the number of the at least one second heating cavity is at least two; and for any adjacent two second heating cavities among at least two second heating cavities, the second connector of one of the adjacent two second heating cavities is insertedly connected with the second connector of the other of the adjacent two second heating cavities. 
     
     
         3 . The water heating device of  claim 1 , wherein the heater comprises a mounting base and a heating pipe; the mounting base is configured to be axially inserted into the first heating cavity or a corresponding one of the at least one second heating cavity; and the mounting base is connected to the heating pipe. 
     
     
         4 . The water heating device of  claim 3 , wherein a side of the mounting base is provided with a pipe joint extending tangentially along a circumference of the mounting base; and the pipe joint is communicated with the communicating pipe. 
     
     
         5 . The water heating device of  claim 3 , wherein the mounting base is connected to the lower end of the first heating cavity or the lower end of the corresponding one of the at least one second heating cavity through a screw arranged axially; an outer circumference of the mounting base is sleevedly provided with a sealing ring; and the sealing ring is configured to be in contact with an inner wall of the first heating cavity or an inner wall of the corresponding one of the at least one second heating cavity. 
     
     
         6 . The water heating device of  claim 1 , wherein a bore diameter of the bypass pipe is smaller than a bore diameter of the first connector and a bore diameter of each second connector. 
     
     
         7 . The water heating device of  claim 1 , wherein both the water inlet pipe and the water outlet pipe are configured to extend in a direction toward the lower end of the first heating cavity. 
     
     
         8 . The water heating device of  claim 6 , wherein the bore diameter of the bypass pipe is smaller than a half of a bore diameter of the communicating pipe; and the first connector, the second connector and the communicating pipe are configured to fit each other in bore diameter.