Patent ID: 7607471

Claim:
A temperature control device, comprising: a liquid tank including an upper portion covered by a detachable upper lid, a circulation passage through which constant-temperature fluid circularly flows, and a heat transfer tube provided in the circulation passage, through which a liquid chemical flows such that a heat exchange between the liquid chemical and the constant-temperature fluid is performed via the heat transfer tube for controlling a temperature of the liquid chemical, the circulation passage including a plurality of concentrically layered channels each being screened by concentrically arranging a plurality of screening cylinders configured for screening said channels, said screening cylinders each having a different diameter and being centered around a center axis of the liquid tank, wherein adjacent channels of said plurality of channels are communicated at opposite axial ends thereof alternately, a communication passage that extends along a bottom wall of the liquid tank, and wherein an inner most channel of said plurality of channels is communicated with an outer most channel of said plurality of channels through said communication passage; a circular screening plate positioned inside said liquid tank, wherein the communication passage is formed between said circular screening plate and a bottom wall of the liquid tank, said screening plate provided above the bottom wall of the liquid tank at a uniform gap and parallel to the bottom wall, wherein an inner circumferential portion of the screening plate connects a lower end of an inner screening cylinder with a first diameter and an outer circumferential portion of the screening plate connects a lower end of an outer screening cylinder with a second diameter; said plurality of screening cylinders including the inner screening cylinder with the first diameter, the outer screening cylinder with the second diameter larger than the first diameter, and an intermediate screening cylinder with a third diameter intermediate of the first and second diameters, wherein the inner screening cylinder and the outer screening cylinder are directed upwardly and are attached to inner and outer circumferential portions of the screening plate, and wherein the intermediate screening cylinder is directed downwardly and is attached to the upper lid so as to be interposed between the inner screening cylinder and the outer screening cylinder; said heat transfer tube including an inlet tube end through which a flow of the liquid chemical is accommodated, an outlet tube end through which the liquid chemical is discharged, and at least one spiral heat transfer coil connected to the tube end so as to be concentrically disposed within the channel and which is concentric with the channel; and a pump which is positioned at a center position of a bottom portion of the liquid tank for circulating the constant-temperature fluid along the circulation passage.