Heating-Type Reservoir Tank

Abstract

A pressure type reserve tank (TA) includes a liquid-tight outer circumferential wall portion ( 1 a, 2 a ) hermetically containing liquid, a central wall portion ( 3, 7; 11 ), arranged in the center of an inner space of the outer circumferential wall portion ( 1 a, 2 a ), having a substantially circular cylinder shape for forming a circular-cylindrical central chamber ( 5 a, 9 a ), and a plurality of partition wall portions ( 4 a to 4 d, 8 a to 8 d; 12 ) radially extending from the central wall portion ( 3, 7; 12 ) to the outer circumferential wall portion ( 1 a, 2 a ) to define a plurality of outer circumferential chambers ( 5 a to 5 e, 9 b to 9 e ) formed between the central wall portion ( 3, 7; 11 ) and the outer circumferential wall portion ( 1 a, 2 a ) and around the central chamber ( 5 a, 9 a ). A plurality of slits ( 6 a to 6 d, 10 a to 10 d ) is provided on the central wall portion ( 3, 7; 11 ) to fluidically communicate the central chamber ( 5 a, 9 a ) and the outer circumferential chambers ( 5 a to 5 e, 9 b to 9 e ).

1 . A pressure type reserve tank comprising:
 a liquid-tight outer circumferential wall portion which contains liquid in a sealed state;   a central wall portion which is shaped in a substantially circular cylinder to form a central chamber therein and is arranged in the center of an inner space of the outer circumferential wall portion; and   a plurality of partition wall portions which radially extend from the central wall portion to the outer circumferential wall portion to define a plurality of outer circumferential chambers formed between the central wall portion and the outer circumferential wall portion and around the central chamber, wherein   a plurality of slits is provided on the central wall portion to fluidically communicate the central chamber and the outer circumferential chambers with each other.   
   
   
       2 . The pressure type reserve tank according to  claim 1 , wherein
 the outer circumferential wall portion, the central wall portion, the partition wall portions and the slits are formed on an upper vessel and a lower vessel which are to be coupled with each other.   
   
   
       3 . The pressure type reserve tank according to  claim 2 , wherein
 the slits includes slits formed on the upper vessel and slits formed on the lower vessel, the slits of the upper and lower vessels being arranged at positions where the slits of the upper vessel and the slits of the lower vessel can be prevented from fluidically communicating the slits of the upper and lower vessels with each other when the upper and lower vessels are coupled with each other, and   an opening end portion of the slits on the upper vessel and an opening end portions of the slits on the lower vessel are blocked off by the central wall portion formed on the lower vessel and the central wall portion formed on the upper vessel, respectively.   
   
   
       4 . The pressure type reserve tank according to  claim 1 , wherein
 the slits are formed at positions which are away from the partition wall portions.   
   
   
       5 . The pressure type reserve tank according to  claim 1 , wherein
 the outer circumferential wall portion, the central wall portion and the partition wall portions are integrally formed of plastic material.   
   
   
       6 . The pressure type reserve tank according to  claim 2 , wherein
 the slits are formed at positions which are away from the partition wall portions.   
   
   
       7 . The pressure type reserve tank according to  claim 3 , wherein
 the slits are formed at positions which are away from the partition wall portions.   
   
   
       8 . The pressure type reserve tank according to  claim 2 , wherein
 the outer circumferential wall portion, the central wall portion and the partition wall portions are integrally formed of plastic material.   
   
   
       9 . The pressure type reserve tank according to  claim 3 , wherein
 the outer circumferential wall portion, the central wall portion and the partition wall portions are integrally formed of plastic material.   
   
   
       10 . The pressure type reserve tank according to  claim 4 , wherein
 the outer circumferential wall portion, the central wall portion and the partition wall portions are integrally formed of plastic material.