Patent Publication Number: US-11654451-B2

Title: Temperature control device for chemical liquid used in semiconductor manufacturing process

Description:
CROSS REFERENCE TO RELATED APPLICATION OF THE INVENTION 
     The present application claims the benefit of Korean Patent Application No. 10-2020-0004302 filed in the Korean Intellectual Property Office on Jan. 13, 2020, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a temperature control device for a chemical liquid used in a semiconductor manufacturing process that has an improvement in a heat transfer structure to thus allow heat generated from a heat generating source to be more efficiently transferred to the chemical liquid. 
     BACKGROUND ART 
     Generally, a substrate processing apparatus, which performs a semiconductor manufacturing process and a liquid crystal display (LCD) manufacturing process, makes use of various chemical liquids for a substrate manufacturing process. 
     For example, the substrate processing apparatus performs etching and cleaning for a substrate, and in such substrate manufacturing process are used various kinds of chemical liquids like acidic solutions such as hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, etc., alkaline solutions such as potassium hydroxide, sodium hydroxide, ammonium, etc., or any one of them or a mixture of them. 
     Through various kinds of chemical liquids, chemical reactions occur to eliminate materials unnecessary from the substrate or to clean the substrate. In this case, a temperature of the chemical liquid applied to the substrate has an important role in the substrate manufacturing process. So as to obtain the uniformity and efficiency in the substrate manufacturing process, accordingly, it is necessary to constantly hold a temperature of the chemical liquid and to stably supply the chemical liquid during the etching or cleaning process. 
     One of conventional devices for controlling a temperature of a chemical liquid is suggested in  FIG.  1   . 
     As shown in  FIG.  1   , a double tube type module is provided to have an outer tube with cooling water introduced into one side thereof and discharged from the other side thereof and a chemical liquid tube located inside the outer tube to flow a chemical liquid therealong. According to the conventional double tube type module, bulky devices like a heater, a cooling device, and so on are required to control the temperature of the chemical liquid, and also, it is hard to induce fast changes in the temperature of the chemical liquid. 
     So as to solve such problems, another conventional device as shown in  FIGS.  2 A and  2 B  is suggested. 
     As shown in  FIGS.  2 A and  2 B , the conventional device includes a chemical liquid jacket  10  along which a chemical liquid flows, silicon carbide (SiC) sheets  20  located on both sides of the chemical liquid jacket  10 , aluminum plates  30  located on the outer surfaces of the silicon carbide sheets  20 , thermoelectric modules  40  located on the outer surfaces of the aluminum plates  30 , and heat sinks  50  located on the outermost sides thereof and having cooling water flow paths. 
     Through such a configuration, heat transfer is applied to the thermoelectric modules  40 , the aluminum plates  30 , the high purity silicon carbide sheets  20 , and the chemical liquid in the order mentioned. The thermoelectric modules  40  electrically connect n-type and p-type thermoelectric semiconductors in series and thermally connect them in parallel with each other, and through changes in a current application direction, heat generated in the n-type and p-type thermoelectric semiconductors can become a high or low temperature quickly. Further, the silicon carbide (SiC) has excellent properties such as good heat resistance and high thermal conductivity, and accordingly, the silicon carbide (SiC) sheets  20  advantageously transfer the heat generated from the thermoelectric modules  40  to the chemical liquid efficiently, without any heat loss. 
     If impurities are produced by the chemical reactions between the chemical liquid and the components around the chemical liquid, further, various defects may occur in the semiconductor manufacturing process, and in this case, the silicon carbide (SiC) sheets  20  do not have any proved chemical resistance. If the silicon carbide (SiC) sheets  20  are used, however, defects often occur due to the generation of impurities. The use of the silicon carbide (SiC) sheets whose chemical resistance is not proved in controlling the temperature of the chemical liquid may cause serious dangers and have many difficulties in manufacturing products. 
     Further, the chemical liquid jacket  10  is made of perfluoroalkoxy (PFA) whose chemical resistance is proved against high temperature available (allowed for flowing the chemical liquid) and the direct contact with the chemical liquid, but the chemical liquid jacket  10  has low heat transfer efficiency according to the properties of the material. If the chemical liquid jacket  10  has the shape of a straight tube, especially, a flow of the chemical liquid becomes laminar, thereby making it hard to ensure high heat exchange efficiency. 
     DISCLOSURE 
     Technical Problem 
     Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the related art, and it is an object of the present invention to provide a temperature control device for a chemical liquid used in a semiconductor manufacturing process that is capable of being configured to allow heat transfer efficiency to the chemical liquid to be raised, without having the silicon carbide (SiC) sheets used in the conventional practice, thereby efficiently controlling a temperature of the chemical liquid. 
     Technical Solution 
     To accomplish the above-mentioned object, according to the present invention, there is provided a temperature control device for a chemical liquid used in a semiconductor manufacturing process, which is located on a chemical liquid circulating and supplying tube to control a temperature of the chemical liquid, the device including: a first heat sink having a cooling water flow path formed therein; a plurality of thermoelectric modules coming into contact with both side surfaces of the first heat sink, respectively; and a second heat sink having first and second heat sink blocks located on one side and the other side of the first heat sink in such a manner as to come into contact with the thermoelectric modules, while placing the first heat sink therebetween, a chemical liquid inlet tube and a chemical liquid outlet tube connected to the first and second heat sink blocks to allow the chemical liquid to be introduced thereinto and discharged therefrom, and a plurality of chemical liquid flow path tubes inserted into the insides of the first and second heat sink blocks in such a manner as to communicate with one another and with the chemical liquid inlet tube and the chemical liquid outlet tube, respectively, to flow the chemical liquid therealong, wherein the plurality of chemical liquid flow path tubes include: a plurality of first rows of chemical liquid flow path tubes located at adjacent positions to the first heat sink; and a plurality of n (n is 2, 3, or 4) rows of chemical liquid flow path tubes spaced apart from the first heat sink by a relatively longer distance than the plurality of first rows of chemical liquid flow path tubes in such a manner as to have different separation distances from each other. 
     The second heat sink further includes: first and second manifold blocks located on one side of the first and second heat sink blocks, having internal flowing spaces therein to accommodate the chemical liquid supplied to or discharged from the chemical liquid flow path tubes thereinto, and communicating with the chemical liquid inlet tube and the chemical liquid outlet tube; and a third manifold block located on the other side of the first and second heat sink blocks, having an internal flowing space therein, and allowing the plurality of chemical liquid flow path tubes arranged on the first and second heat sink blocks to communicate with one another. 
     Each of the first and second heat sink blocks includes first to n+1 heat sink block pieces separably coupled to each other in such a manner as to fix the first and n rows of chemical liquid flow path tubes thereto, while having insertion grooves corresponding to the sectional shapes of the first and n rows of chemical liquid flow path tubes. 
     The second heat sink further includes turbulent flow generating blocks inserted into the end peripheries of the plurality of chemical liquid flow path tubes to generate turbulent flows in the chemical liquid of the plurality of chemical liquid flow path tubes. 
     The plurality of chemical liquid flow path tubes have the shape of a straight tube, and each turbulent flow generating block includes: a turbulent flow generating block body; and a plurality of turbulent flow inducing paths formed on the turbulent flow generating block body in such a manner as to be inclined with respect to a longitudinal center axis of each chemical liquid flow path tube to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube to thus induce the turbulent flows caused by the collision with the inner peripheral surface of the chemical liquid flow path tube. 
     The plurality of chemical liquid flow path tubes have the shape of a straight tube, and each turbulent flow generating block includes: a turbulent flow generating block body; and a plurality of turbulent flow inducing paths formed on the turbulent flow generating block body in such a manner as to be gradually increased in a sectional area thereof toward the inner side of each chemical liquid flow path tube to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube to thus induce the turbulent flows caused by the collision with the inner peripheral surface of the chemical liquid flow path tube. 
     The plurality of chemical liquid flow path tubes have the shape of a straight tube, and each turbulent flow generating block includes: a turbulent flow generating block body; a plurality of turbulent flow inducing paths passing through the turbulent flow generating block body in longitudinal directions in such a manner as to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube to thus induce the turbulent flows caused by the collision with the inner peripheral surface of the chemical liquid flow path tube, and spiral guide vanes formed along the inner peripheral surfaces of the plurality of turbulent flow inducing paths in such a manner as to generate spiral vortexes, while the chemical liquid is passing through the turbulent flow generating block body. 
     Advantageous Effects 
     According to the present invention, the temperature control device according to the present invention is configured to allow the second heat sink to have the plurality of chemical liquid flow path tubes with the given diameter arranged in a plurality of rows, not having a single flow path, so that the heat transfer efficiency from the second heat sink to the chemical liquid can be improved to thus control the temperature of the chemical liquid easily and efficiently. 
     In addition, the temperature control device according to the present invention is provided with the second heat sink having the first and second heat sink blocks, so that the chemical liquid receives heat multiple times, while flowing around the first heat sink, thereby more upgrading the heat exchange efficiency. 
     Further, the temperature control device according to the present invention inserts the turbulent flow generating blocks into the end peripheries of the chemical liquid flow path tubes and freely changes the internal structures of the chemical liquid flow path tubes, so that the heat transferred to the second heat sink can be more evenly transferred to the chemical liquid, thereby enhancing the heat exchange efficiency. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIGS.  1  to  2 B  are views showing temperature control devices for a chemical liquid used in a semiconductor manufacturing process in conventional practices. 
         FIG.  3    is a perspective view showing a temperature control device for a chemical liquid used in a semiconductor manufacturing process according to the present invention. 
         FIG.  4    is a front sectional view showing the temperature control device of  FIG.  3   . 
         FIG.  5    is a side sectional view showing the temperature control device of  FIG.  3   . 
         FIGS.  6 A and  6 B  are views showing laminar flows in a straight tube. 
         FIG.  7    is a sectional view showing a state where a turbulent flow generating block is inserted into an end periphery of a chemical liquid flow path tube in the temperature control device according to the present invention. 
         FIGS.  8 A and  8 B  are perspective and front views showing an example of the turbulent flow generating block of  FIG.  7   . 
         FIG.  9    is a sectional view showing a state where the turbulent flow generating blocks are inserted into the temperature control device according to the present invention. 
         FIGS.  10 A and  10 B  are perspective and front views showing another example of the turbulent flow generating block of the temperature control device according to the present invention. 
         FIGS.  11 A and  11 B  are perspective and front views showing still another example of the turbulent flow generating block of the temperature control device according to the present invention. 
         FIGS.  12 A to  12 C  are top views showing the chemical liquid flow path tube with various shapes in the temperature control device according to the present invention. 
     
    
    
     MODE FOR THE INVENTION 
     Hereinafter, the present invention will be in detail described with reference to the attached drawings. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to variously employ the present invention in virtually any appropriately detailed structure. In the drawings, it should be noted that the corresponding parts in the embodiments of the present invention are indicated by corresponding reference numerals. 
     A temperature control device for a chemical liquid used in a semiconductor manufacturing process according to the present invention is located on a section where the chemical liquid flows in various processes of manufacturing a semiconductor, like wet etching, cleaning, and so on, to hold the chemical liquid at a given temperature constantly when the chemical liquid is heated or cooled, and to do this, the temperature control device is configured to improve heat transfer efficiency to the chemical liquid flowing along an interior of a tube, thereby ensuring excellent temperature control for the chemical liquid. 
     Hereinafter, an explanation on a temperature control device for a chemical liquid used in a semiconductor manufacturing process according to the present invention will be in detail given with reference to the attached drawings. 
     As shown in  FIGS.  3  to  5   , a temperature control device for a chemical liquid used in a semiconductor manufacturing process according to the present invention is located on a chemical liquid circulating and supplying tube  370  to control a temperature of the chemical liquid and includes a first heat sink  100 , thermoelectric modules  200 , and a second heat sink  300 . 
     The first heat sink  100  has the shape of a general rectangular tube and is provided with a cooling water flow path  110  formed therein to flow processing cooling water (PCW) or other cooling water therealong. If a high temperature is generated on one side surface of the thermoelectric modules  200  coming into contact with the first heat sink  100  through the operations of the thermoelectric modules  200 , in this case, the cooling water serves to rapidly cool a portion (heat radiation side surface) where the high temperature is generated and thus to constantly maintain a temperature on the heat radiation side surface, so that cooling/heating efficiency of the thermoelectric modules  200  can be prevented from being lowered to thus improve the durability of the thermoelectric modules  200 . So as to allow low temperature heat of the processing cooling water to be efficiently transferred to one side surface of the thermoelectric modules  200  from which high temperature is emitted, like this, the first heat sink  100  and the second heat sink  300  (including first and second heat sink blocks  340  and  350  as will be discussed later) are made of aluminum alloys with high thermal conductivity. 
     The thermoelectric modules  200  are located to come into contact with both side surfaces of the first heat sink  100  and serve to heat or cool the chemical liquid through control of heat generated therefrom. In detail, a high or low temperature is generated on contacted surfaces of the thermoelectric modules  200  with the second heat sink  300  as will be discussed later, thereby controlling a temperature of the chemical liquid. The thermoelectric modules  200  are arranged uniformly on both side surfaces of the first heat sink  100 , respectively. 
     As shown in  FIGS.  4  and  5   , the second heat sink  300  comes into contact with the thermoelectric modules  200 , while placing the first heat sink  100  between the thermoelectric modules  200 , and has a plurality of chemical liquid flow path tubes  310  along which the chemical liquid flows. 
     On the other hand, the heat generated from the thermoelectric modules  200  is transferred to the second heat sink  300 , the chemical liquid flow path tubes  310 , and the chemical liquid in the order mentioned, thereby causing the change in the temperature of the chemical liquid. According to the present invention, the second heat sink  300  does not have any single flow path, but has a plurality of flow paths (chemical liquid flow path tubes  310 ) with a given diameter, so that the efficiency in the heat transfer from the second heat sink  300  to the chemical liquid can be improved, thereby easily and conveniently performing the temperature control for the chemical liquid. If the single chemical liquid flow path is formed in the second heat sink like the conventional practice, in detail, the heat transfer efficiency may be gradually decreased toward the inner side of the single chemical liquid flow path with respect to the sectional area thereof in a flowing direction. According to the present invention, however, the plurality of chemical liquid flow paths, not the single chemical liquid flow path are formed in the second heat sink  300 , and also, the sectional areas of the plurality of chemical liquid flow paths have given sizes, so that the heat of the second heat sink  300  can be transferred to the chemical liquid most efficiently. 
     According to the present invention, the second heat sink  300  includes a chemical liquid inlet tube  320 , a chemical liquid outlet tube  330 , the first and second heat sink blocks  340  and  350 , and first to third manifold blocks  361 ,  362 , and  363 . 
     The chemical liquid inlet tube  320  is connected to the chemical liquid circulating and supplying tube  370  to thus form a flow path along which the chemical liquid flows to the plurality of chemical liquid flow path tubes  310 . The chemical liquid outlet tube  330  is connected to the chemical liquid circulating and supplying tube  370  to thus form a flow path along which the chemical liquid discharged from the plurality of chemical liquid flow path tubes  310  flows to the chemical liquid circulating and supplying tube  370 . 
     The first heat sink block  340  and the second heat sink block  350  are located on one side and the other side of the first heat sink  100  and have the plurality of chemical liquid flow path tubes  310  located at the insides thereof in such a manner as to communicate with the chemical liquid inlet tube  320  and the chemical liquid outlet tube  33 . 
     According to the present invention, the second heat sink  300  is separable into the first heat sink block  340  and the second heat sink block  350 , so that while the chemical liquid is flowing around the first heat sink  100 , the chemical liquid continuously receives the heat from the first heat sink block  340  and the second heat sink block  350 , thereby improving the heat exchange efficiency thereof. 
     As mentioned above, after the heat generated from the thermoelectric modules  200  is transferred to the first heat sink block  340  and the second heat sink block  350 , it is transferred to the chemical liquid through the chemical liquid flow path tubes  310 , and so as to increase the heat transfer efficiency between the first heat sink block  340  and the second heat sink block  350  and the chemical liquid flow path tubes  310 , in this case, the outer peripheral surfaces of the chemical liquid flow path tubes  310  desirably come into close contact with the first heat sink block  340  and the second heat sink block  350 . 
     Of course, after a plurality of through holes are formed on the first heat sink block  340  and the second heat sink block  350 , the chemical liquid flow path tubes  310  are press-fitted to the through holes, but in the fitting process, the chemical liquid flow path tubes  310  may be undesirably broken. 
     Hereinafter, an explanation of the plurality of chemical liquid flow path tubes  310 , the first heat sink block  340 , and the second heat sink block  350  will be in more detail given. 
     According to the present invention, as shown in  FIGS.  4  and  5   , the plurality of chemical liquid flow path tubes  310  include a plurality of first rows of chemical liquid flow path tubes  316  located at adjacent positions to the first heat sink  100  and a plurality of n rows of chemical liquid flow path tubes  317  spaced apart from the first heat sink  100  by a relatively longer distance than the plurality of first rows of chemical liquid flow path tubes  316 . 
     In specific, the plurality of rows of the chemical liquid flow path tubes  310  are arranged in transverse directions (X-axis directions) and longitudinal directions (Y-axis directions) with respect to the first heat sink block  340  and the second heat sink block  350 . Under the above-mentioned configuration, the heat generated from the thermoelectric modules  200  is transferred to the chemical liquid in the plurality of rows of the chemical liquid flow path tubes  310 , thereby increasing the heat transfer area. 
     In the case of the plurality of n rows of chemical liquid flow path tubes  317 , for example, n is 2, 3, or 4, and accordingly, the plurality of n rows of chemical liquid flow path tubes  317  may include a plurality of second, third, and fourth rows of chemical liquid flow path tubes  317 . That is, total four rows of chemical liquid flow path tubes are formed in the longitudinal directions. The plurality of second, third, and fourth rows of chemical liquid flow path tubes  317  are spaced apart from the first heat sink  100  at different separation distances from each other. On the other hand, in the drawings, an example in which n is 2 is adopted, so that total two rows of chemical liquid flow path tubes are arranged in the longitudinal directions. Hereinafter, the example in which n is 2 will be suggested and explained for the convenience of the description. Only if the heat generated from the thermoelectric modules  200  is sufficiently transferred to the chemical liquid flow path tubes, however, n is not limited to 2, 3, or 4, and of course, n may be greater than the value mentioned above. 
     As shown in  FIG.  4   , the first heat sink block  340  and the second heat sink block  350  have first to n+1 heat sink block pieces  345 ,  346 , and  347  separably coupled to each other in such a manner as to fix the first and n (n=2) rows of chemical liquid flow path tubes  316  and  317  thereto. 
     According to the present invention, for example, the respective heat sink block pieces have semicircular insertion grooves  341 , and after the chemical liquid flow path tubes  310  are seated onto the insertion grooves  341  of any one heat sink block piece, the neighboring heat sink block piece is coupled to one block piece by means of bonding or screw-fastening. As shown, if the heat sink block pieces are three, they can be simultaneously coupled or separated through screws. 
     The first and second manifold blocks  361  and  362  are located on one side of the first and second heat sink blocks  340  and  350  in such a manner as to have internal flowing space therein and also accommodate the chemical liquid supplied to or discharged from the chemical liquid flow path tubes  310  thereinto in such a manner as to communicate with the chemical liquid inlet tube  320  and the chemical liquid outlet tube  330 . 
     In detail, an end periphery of the chemical liquid inlet tube  320  is sealedly inserted into one side of the first manifold block  361 , and the chemical liquid flow path tubes  310  are sealedly inserted into the other side of the first manifold block  361 . Accordingly, the chemical liquid, which is introduced into the first manifold block  361  through the chemical liquid inlet tube  320 , distributedly flows to the interiors of the chemical liquid flow path tubes  310 . In more detail, the chemical liquid with a given flowing pressure flows to the interior of the first manifold block  361  through the chemical liquid circulating and supplying tube  370  and the chemical liquid inlet tube  320 , so that the internal space of the first manifold block  361  is filled with the chemical liquid to allow the chemical liquid to distributedly flow to the chemical liquid flow path tubes  310  as uniform as possible by means of the negative pressure in the first manifold block  361 . 
     Further, an end periphery of the chemical liquid outlet tube  330  is sealedly inserted into one side of the second manifold block  362 , and the chemical liquid flow path tubes  310  are sealedly inserted into the other side of the second manifold block  362 . Accordingly, the chemical liquid, which is introduced into the second manifold block  362  through the chemical liquid flow path tubes  310  after flowing to the interiors of the first and second heat sink blocks  340  and  350 , is discharged through the chemical liquid outlet tube  330 . 
     As shown in  FIG.  5   , the third manifold block  363  has an internal flowing space therein and is located on the other side of the first and second heat sink blocks  340  and  350  in such a manner as to allow the chemical liquid flow path tubes  310  arranged on the first and second heat sink blocks  340  and  350  to communicate with one another. 
     In detail, the end peripheries of the chemical liquid flow path tubes  310  arranged on the first and second heat sink blocks  340  and  350  are sealedly inserted into one side of the third manifold block  363 . Accordingly, the chemical liquid, which is introduced through the chemical liquid inlet tube  320 , flows to the first manifold block  361 , the chemical liquid flow path tubes  310  of the first heat sink block  340 , the third manifold block  363 , the chemical liquid flow path tubes  310  of the second heat sink block  350 , and the second manifold block  362  and is then discharged through the chemical liquid outlet tube  330 . While the chemical liquid is being circulatedly moved, like this, it receives the heat generated from the thermoelectric modules  200  and is thus heated or cooled, so that it is changed in temperature and is then supplied to a next processing line. 
     According to the present invention, the chemical liquid flow path tubes  310  may be made of perfluoroalkoxy (PFA), and the first to third manifold blocks  361 ,  362 , and  363  are made of polytetrafluoroethylene (PTFE). 
     As mentioned above, the chemical liquid flow path tubes  310  and the first to third manifold blocks  361 ,  362 , and  363  actually come into direct contact with the chemical liquid, and accordingly, they are made of PFA and PTFE having good chemical resistances, thereby to the maximum preventing impurities from being produced due to chemical reactions occurring through the direct contacts with the chemical liquid. 
     So as to prevent the production of fine impurities, like this, the components coming into direct contact with the chemical liquid are made of PFA and PTFE, but since the PFA and PTFE have relatively low thermal conductivity, the heat transfer efficiency may be deteriorated. 
     As described above, however, the second heat sink  300  does not have any single flow path, but has the plurality of the chemical liquid flow path tubes  310  with the given diameter, so that the efficiency in the heat transfer from the second heat sink  300  to the chemical liquid can be improved, thereby overcoming the disadvantages the PFA and PTFE have had. 
     In addition to the structure where the heat transfer efficiency is increased, another structure in which the heat transfer efficiency in the chemical liquid flowing to the chemical liquid flow path tubes  310  of the second heat sink  300  can be raised is suggested. 
     In detail, as shown in  FIGS.  7  to  11 B , the second heat sink  300  further includes turbulent flow generating blocks  380 ,  390 , or  400  inserted into the end peripheries of the chemical liquid flow path tubes  310  to generate turbulent flows in the chemical liquid of the chemical liquid flow path tubes  310 . 
     According to the present invention, the chemical liquid flow path tubes  310  are straight tubes that provide straight line flow paths, and as shown in  FIGS.  6 A and  6 B , generally, a flow of a fluid in the interior of the straight tube is laminar. In this case, the heat transfer efficiency in the chemical liquid flowing to the chemical liquid flow path tubes  310  of the second heat sink  300  is more lowered than that in the turbulent flows. 
     According to the present invention, as shown in  FIG.  7   , the turbulent flows in the chemical liquid flow path tubes  310  are induced through the turbulent flow generating blocks  380 , so that the heat generated from the second heat sink  300  can be uniformly transferred to the chemical liquid in the chemical liquid flow path tubes  310 , thereby more increasing the heat exchange efficiency of the chemical liquid. 
     For example, as shown in  FIGS.  7  to  9   , each turbulent flow generating block  380  includes a turbulent flow generating block body  381  and a plurality of turbulent flow inducing paths  382  formed on the turbulent flow generating block body  381  in such a manner as to be inclined with respect to a longitudinal center axis of each chemical liquid flow path tube  310  to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube  310  to thus induce the turbulent flows caused by the collision with the inner peripheral surfaces of the chemical liquid flow path tube  310 . 
     For another example, as shown in  FIGS.  10 A and  10 B , each turbulent flow generating block  390  includes a turbulent flow generating block body  391  and a plurality of turbulent flow inducing paths  392  formed on the turbulent flow generating block body  391  in such a manner as to be gradually increased in a sectional area thereof toward the inner side of each chemical liquid flow path tube  310  to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube  310  to thus induce the turbulent flows caused by the collision with the inner peripheral surfaces of the chemical liquid flow path tube  310 . 
     For still another example, as shown in  FIGS.  11 A and  11 B , each turbulent flow generating block  400  includes a turbulent flow generating block body  401 , a plurality of turbulent flow inducing paths  402  passing through the turbulent flow generating block body  401  in longitudinal directions in such a manner as to allow the chemical liquid to flow toward the inner peripheral surface of the chemical liquid flow path tube  310  to thus induce the turbulent flows caused by the collision with the inner peripheral surface of the chemical liquid flow path tube  310 , and spiral guide vanes  403  formed along the inner peripheral surfaces of the plurality of turbulent flow inducing paths  402  in such a manner as to generate spiral vortexes, while the chemical liquid is passing through the turbulent flow generating block body  401 . 
     In case of all of the turbulent flow generating blocks  380 , the turbulent flow generating blocks  390 , and the turbulent flow generating blocks  400 , the turbulent flow inducing paths  382 ,  392 , and  402  are formed penetratedly into the turbulent flow generating block bodies  381 , the turbulent flow generating block bodies  391 , and the turbulent flow generating block bodies  401 . 
     In addition thereto, the turbulent flow inducing paths may be configured to have free structures wherein the turbulent flows can be generated. Even if not shown, the turbulent flow inducing paths may be formed curvedly at least one time, and in the same manner as above, in this case, the chemical liquid flows to the inner peripheries of the turbulent flow inducing paths toward the inner peripheral surface of the chemical liquid flow path tube  310 . 
     Further, even though not specifically shown in the drawings, the spiral guide vanes  403  may be formed along the inner peripheral surfaces of the turbulent flow generating blocks as shown in  FIGS.  8 A,  8 B,  10 A and  10 B , and in this case, the turbulent flow generating effectiveness can be maximized to thus improve heat exchange efficiency. 
     In this case, the turbulent flow generating blocks  380 ,  390 , or  400  are press-fitted to the chemical liquid flow path tubes  310 , and they are located on a chemical liquid inlet side toward the interior of the first heat sink block  340  and on a chemical liquid inlet side toward the interior of the second heat sink block  350 . Also, the turbulent flow generating blocks  380 ,  390  or  400  come into direct contact with the chemical liquid, and in the same manner as above, accordingly, they are made of PFA or PTFE. 
     In addition to the turbulent flow generating blocks  380 ,  390 , or  400 , another structure in which the heat transfer efficiency in the chemical liquid flowing to the chemical liquid flow path tubes  310  of the second heat sink  300  can be raised is suggested. 
     For example, as shown in  FIG.  12 A , each chemical liquid flow path tube  310  has protruding portions  311  and concave portions  312  repeatedly formed on the inner peripheral surface thereof along a circumferential direction thereof in such a manner as to be extended along a longitudinal direction thereof. Through the formation of the protruding portions  311  and the concave portions  312 , heat exchange areas between the chemical liquid flow path tube  310  and the chemical liquid flowing therealong can be increased, thereby improving the heat exchange efficiency between the second heat sink  300  and the chemical liquid. 
     For other examples, as shown in  FIGS.  12 B and  12 C , each chemical liquid flow path tube  310  has a plurality of partitioning bars  313  extendedly formed at the inside thereof along a longitudinal direction thereof in such a manner as to partition the flow path into a plurality of areas. Through the formation of the partitioning bars  313 , heat exchange areas between the chemical liquid flow path tube  310  and the chemical liquid flowing therealong can be increased, thereby improving the heat exchange efficiency between the second heat sink  300  and the chemical liquid. 
     Even if not shown, in detail, the turbulent flow generating blocks  380 ,  390  or  400  may be inserted into the chemical liquid flow path tubes  310  having the structures as shown in  FIGS.  12 A to  12 C , and in this case, degrees of turbulent flows generated in the chemical liquid flow path tubes  310  can be more raised to thus upgrade the heat transfer efficiency. Through the formation of the portioning bars  313 , especially, if the sectional area of each chemical liquid flow path tube  310  is partitioned into the plurality of small sectional areas, degrees of turbulent flows generated in the partitioned flow paths can be increased to the maximum. 
     While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention. Therefore, it should be understood that the invention covers all the modifications, equivalents, and replacements within the idea and technical scope of the invention. 
     EXPLANATIONS OF REFERENCE NUMERALS 
     
         
         
           
               100 : first heat sink 
               200 : thermoelectric module 
               300 : second heat sink 
               310 : chemical liquid flow path tube 
               320 : chemical liquid inlet tube 
               330 : chemical liquid outlet tube 
               340 : first heat sink block 
               350 : second heat sink block 
               361 : first manifold block 
               362 : second manifold block 
               363 : third manifold block 
               380 ,  390 ,  400 : turbulent flow generating block