Heat storage tank with improved heat insulating performance

Abstract

A heat storage tank, comprises an inner cylinder 81 having a storage section 811 for storing liquid, an opening 812 at a lower position of the storage section 811 and a body 84 in which a liquid inflow channel 841 and a liquid outflow channel 842 are formed. The body blocks the opening 812. When the inner diameter of the inner cylinder 81 is referred to as a tank inner diameter D and the vertical length of the storage section 811 is referred to as a tank height H, D/H≦0.5 holds. Therefore, the storage section 811 is elongated in the vertical direction and the distance between the body 84, which is a main heat radiating portion, and the high temperature water region is increased and, as a result, the high temperature water region is extended in the vertical direction.

1 . A heat storage tank comprising: 
 an inner cylinder having a storage section for storing liquid and an opening at a lower position of the storage section;    an outer cylinder accommodating the inner cylinder therein and forming a thermally insulated space between the inner cylinder and the outer cylinder; and    a body in which a liquid inflow channel and a liquid outflow channel for causing the storage section to be communicated with an outside are formed, the body blocking the opening,    wherein an inner diameter of the inner cylinder is referred to as a tank inner diameter D, a length of the storage section in a vertical direction is referred to as a tank height H in the heat storage tank in which the storage section is a columnar space extending in the vertical direction, and a ratio D/H satisfies the following: D/H≦0.5.    
   
   
       2 . The heat storage tank as set forth in  claim 1 , mounted in a vehicle having a water-cooled internal combustion engine that is cooled by cooling water, wherein liquid stored in the storage section is cooling water that has risen in temperature after cooling the water-cooled internal combustion engine.