Abstract:
The present invention provides an exhaust machine which includes a first exhaust tube, a second exhaust tube, a first closed box, a second closed box, a pipe and a motor. The first exhaust tube is connected to the first closed box and the second exhaust tube is connected to the second closed box. The pipe penetrates the first closed box and the second closed box and connects to an exhaust gas source. The pipe includes a first inner opening and a second inner opening. The motor connects to the pipe and drives the pipe to make the exhaust gas pass into the first closed box through the first inner opening or into the second closed box through the second inner opening.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to an exhaust device, and more specifically, to an exhaust device capable of emitting different gases to different exhaust pipes. 
     2. Description of the Prior Art 
     A vacuum exhaust device is widely used in various semiconductor equipments in order to remove the exhaust gas produced during the semiconductor process. In general, semiconductor equipment may produce different kinds of exhaust, wherein some of them must be treated or recycled respectively. Therefore, an exhaust machine capable of diverging and emitting the different exhausts to different exhaust pipes is necessary. 
     Please refer to  FIG. 1  which illustrates a schematic view of a conventional exhaust machine. The conventional exhaust machine  100  includes a first enclosed chamber  102 , a second enclosed chamber  104 , and a third enclosed chamber  106 . The first enclosed chamber  102  is connected to an exhaust source  126 . An opening  118  is formed between the first enclosed chamber  102  and the third enclosed chamber  106 . The second enclosed chamber  104  is connected to a first exhaust tube  108 , while the third enclosed chamber  106  is connected to a second exhaust pipe  110  and a third exhaust pipe  112 . The first enclosed chamber  102  is provided with a rotary valve  114  to selectively close one of the opening  118  and the opening  120 . The third enclosed chamber  106  is provided with a rotary valve  116  to selectively close one of the second exhaust pipe  110  and the third exhaust pipe  112 . The rotary valves  114  and  116  may block selected openings and exhaust pipes such that the exhaust may be extracted to a corresponding exhaust pipe. 
     Though the conventional exhaust machine  100  may selectively emit different exhausts to different exhaust pipes, the rotary valves  114  and  116  are vulnerable to the wearing of repeating rotation due to their ill-designed structure. 
     SUMMARY OF THE INVENTION 
     The present invention, therefore, provides an exhaust machine capable of diverging and emitting different exhausts to different exhaust pipes and has the advantages of smaller volume and being less prone to malfunctioning. 
     According to one embodiment, the present invention provides an exhaust machine comprising a first exhaust pipe connected to a first enclosed chamber, a second exhaust pipe connected to a second enclosed chamber, and a extraction tube penetrating through the first enclosed chamber and the second enclosed chamber and connecting to an exhaust source, wherein the extraction tube is provided with a first inner opening and a second inner opening. A pump is connected to the extraction tube and may drive the extraction tube to rotate around such that the exhaust produced from the exhaust source may enter the first enclosed chamber via the first opening or enter the second enclosed chamber via the second opening. 
     The exhaust machine disclosed in the present invention is provided with a particular extraction tube and the openings formed thereon to diverge and emit the different exhausts to different exhaust pipes via pumping. Therefore, the exhaust machine provided by present invention is smaller in size and less prone to malfunctioning. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a schematic view of a convention exhaust machine; 
         FIG. 2  illustrates a schematic view of an exhaust machine in a first embodiment of the present invention; 
         FIG. 3  illustrates a schematic cross-sectional view of an extraction in the present invention; 
         FIG. 4  illustrates a schematic view of the inner openings in the present invention; and 
         FIG. 5  illustrates a schematic view of an exhaust machine in a second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     In order to provide a better understanding of the present invention to those of ordinarily skilled in the art, several preferred embodiments are enumerated with reference to the accompanying drawings, to explain the construction and the desired efficacy of the present invention. 
     Please refer to  FIG. 2  which illustrates the schematic view of an exhaust machine in accordance with a first embodiment of the present invention. As shown in  FIG. 2 , the exhaust machine  300  of the present invention includes a first enclosed chamber  302 , a second enclosed chamber  304  and a third enclosed chamber  306 . The three enclosed chambers may or may not be adjacent to each other. Preferably, the three enclosed chambers are arranged in a first direction  301 . In the present invention, the first enclosed chamber  302  is connected to a first exhaust pipe  308 , the second enclosed chamber  304  is connected to a second exhaust pipe  310 , and the third enclosed chamber  306  is connected to a third exhaust pipe  312 . The three exhaust pipes may provide the pumping force to the connected enclosed chamber respectively in order to pump out the air in the enclosed chambers. In one embodiment of the present invention, the other end of the first exhaust pipe  308 , the second exhaust pipe  310  and the third exhaust pipe  312  are connected respectively to different exhaust recycling devices. For example, the first exhaust pipe  308  may be connected to an alkali exhaust recycling device for treating the alkali gas such as NH 4 OH. The second exhaust pipe  310  may be connected to an organic exhaust recycling device for treating the organic gas such as isopropyl alcohol (IPA), acetone, or propylene glycol monomethyl ether (PGME). The third exhaust pipe  312  may be connected to an acidic exhaust recycling device for treating the acidic gas such as hydrochloric acid (HCl), sulfuric acid (H 3 PO 4 ), etc. The exhaust emitted from the first, second, and third exhaust pipes are not limited thereto. For example, the first exhaust pipe  308  may emit organic exhaust, the second exhaust pipe  310  may emit acidic exhaust, and the third exhaust pipe  312  may emit alkaline exhaust. In consideration of the acidic exhaust and alkaline exhaust not being adjacent to each other, it is preferable to separate the exhaust pipe for emitting acidic exhaust and the exhaust pipe for emitting alkaline exhaust by other exhaust pipes. 
     One main feature of the exhaust machine  300  in the present invention is an extraction tube  317  penetrating through the first enclosed chamber  302 , the second enclosed chamber  304 , and the third enclosed chamber  306 . One end of the extraction tube  317  is connected to an exhaust source  326  such as a reaction chamber of a semiconductor equipment, while the other end of the extraction tube  317  is connected to a pump  328 . The extraction tube  317  includes an outer tube  314  and an inner tube  316 . The outer tube  314  is provided with a long narrow opening extending and being exposed to the first enclosed chamber  302 , the second enclosed chamber  304  and the third enclosed chamber  306 . The inner tube  316  disposed inside the outer tube  314  is provided with a first inner opening  320 , a second inner opening  322 , and a third inner opening  324  corresponding respectively to the first enclosed chamber  302 , the second enclosed chamber  304 , and the third enclosed chamber  306 . One end of the inner tube  316  is connected to pump  328 . The pump  328  may drive the inner tube  316  to rotate in the first direction  301  such that only one of the first inner opening  320 , the second inner opening  322  and the third inner opening  324  is aligned with the outer opening  318 . 
     Please refer now to  FIG. 3  which illustrates the cross-sectional view of the extraction tube in the present invention taken along the line A-A in  FIG. 2 . As shown in  FIG. 3 , the first inner opening  320 , the second inner opening  322 , and the third inner opening are oriented at different angles rather than overlapping with each other while seen from the first direction  301 . As shown in  FIG. 3 , please also refer to  FIG. 2 , a control component  330  will instruct the pump  328  to rotate the inner tube  316  of the extraction tube  317  as the exhaust is produced from the exhaust source  326 . The inner tube  316  of the extraction tube  317  is rotated by the pump  328  such that the second inner opening  322  of the inner tube  316  is aligned with the outer opening  318  of the outer tube  316  while the first inner opening  320  and the third inner opening  322  are not aligned with the outer opening  318 . In this way, the organic exhaust produced from the exhaust source  326  will enter the second enclosed chamber  304  via the second inner opening  322  and the outer opening  318 , and then be emitted from the second exhaust pipe  310 . Similarly, if acidic exhaust is produced from the exhaust source  326 , the third inner opening  324  will be rotated to align with the outer opening  318  for allowing the acidic exhaust to enter the third enclosed chamber  306  and the third exhaust pipe  312  and then be emitted therefrom. 
     Please refer to  FIG. 4  which illustrates a schematic view of the inner opening in the present invention. The sizes of the first inner opening  320 , the second inner opening  322 , and the third inner opening  324  must be adequately dimensioned to provide best exhaust efficiency. In a preferred embodiment of the present invention, take the second inner opening  322  as example, the height H of the second inner opening  322  is generally ranging from 100 mm to 155 mm, preferably 130 mm, while the surface area of the opening is generally ranging from 15000 mm 2  to 20000 mm 2 , preferably 17500 mm 2 . The included angle defined by the second inner opening  322  and the center of inner tube  316  is generally ranging from 90° to 110°, preferably 100°. Moreover, the extraction pressure of the first exhaust pipe  308 , the second exhaust pipe  310 , and the third exhaust pipe  312  is about −400 Pa, while the extraction speed is about 305 m 2 /min. 
     Please note that the exhaust machine  300  of the present invention is not limited to three enclosed chambers or one extraction tube. The numbers of the components may be modified depending on the requirements of products. For example, two kinds of exhaust will need two enclosed chambers to be emitted therefrom. Alternatively, please refer to  FIG. 5  which illustrates the schematic view of the exhaust machine in accordance with a second embodiment of the present invention, the exhaust machine  300  may be additionally provided with another extraction tube  317   a  which is connected to another exhaust source  326   a  and is penetrating through the first enclosed chamber  302 , the second enclosed chamber  304 , and the third enclosed chamber  306 . The embodiment of extraction tube  317   a  is generally the same as the one of extraction tube  317 , thus the details of extraction tube  317   a  is omitted herein for the simplicity of description. When the exhaust is produced from the exhaust source  326   a , the exhaust may be emitted into the first enclosed chamber  302 , the second enclosed chamber  304 , or the third enclosed chamber  306  via the extraction tube  317   a  in a similar manner. The exhaust machine  300  of the present invention can extract simultaneously the different exhausts produced from the exhaust source  326  and the exhaust source  326   a  without interfering with each other, thereby significantly enhancing the efficiency and practicability of the exhaust machine. 
     In conclusion, the exhaust machine provided by present invention has the features of a particular extraction tube and the opening formed thereon. The different exhausts may be diverged and emitted to different exhaust pipes by a pump. The advantages of the present invention are smaller volume and being less prone to malfunctioning. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.