Patent Publication Number: US-2018045466-A1

Title: Gas exhausting system and method for exhausting gas

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure is related to a gas exhausting system and a method for exhausting gas. In particular, the present disclosure relates to a gas exhausting system disposed in an exhaust pending region of a heating furnace for accelerating gas exhaust, with better gas exhaust efficiency, and a method for exhausting gas. 
     2. Description of Related Art 
     A heating furnace can be used to heat a workpiece to be processed. The heating furnace has a proper delivery structure to transport the workpiece to pass through an inside of the furnace body, and heats the workpiece by a heater. When the heating furnace is operating, it gives off waste gas. Thus, a gas exhausting device is needed to properly discharge the exhaust gas for avoiding endangering human health. The current gas exhausting device has an exhaust pipe. One end of the exhaust pipe is connected to an exhaust pending region, so that the waste gas can be discharged through the exhaust pipe after the burning process. However, the gas exhausting performance of current gas exhausting devices usually is poor, and the waste gas remained in the furnace body of the heating furnace may react with the workpiece. Consequently, the appearance and characteristics of the workpiece are affected due to the waste gas, resulting in reduced product yield. 
     Hence, the inventor of the present disclosure believes that the above mentioned disadvantages can be overcome, and has been studying and working on the case. Finally the present disclosure which has a better design is proposed to effectively improve the above mentioned disadvantages. 
     SUMMARY OF THE INVENTION 
     One of the objectives of the present disclosure is to provide a gas exhausting system and a method for exhausting gas, which can enhance the performance of gas exhaust and prevent the waste gas from affecting the appearance and characteristics of the workpiece. 
     In order to achieve the above objectives, according to one exemplary embodiment of the present disclosure, a gas exhausting system is provided and is disposed in a heating furnace. The heating furnace has a furnace body. A workpiece is transported in the furnace body along a transporting direction. The gas exhausting system includes at least two gas exhausting modules. The at least two gas exhausting modules are disposed on the heating furnace, and respectively arranged at a front position and a rear position along the transporting direction of the heating furnace. Each gas exhausting module has a casing and an exhausting channel. The casing has two ends which are respectively defined as a first end and a second end. The first end and the second end are opened. The first end is connected to an exhaust pending region in the furnace body of the heating furnace. The exhausting channel has an opening end formed at an upper end thereof. The opening end of the exhausting channel is lower than the second end of the casing. One side of the exhausting channel is formed with a lateral opening, and the lateral opening is connected to a blowing machine. The blowing machine is capable of propelling air into the exhausting channel, so as to upward output a hyperbaric gas through the opening end of the exhausting channel, and accelerate the waste gas to be exhausted in the furnace body. 
     In order to achieve the above objectives, according to one exemplary embodiment of the present disclosure, a method for exhausting gas is provided and includes the steps as follows: providing a gas exhausting system in a heating furnace, the heating furnace having a furnace body to process a workpiece, the workpiece being movable in the furnace body along a transporting direction; wherein the gas exhausting system includes at least two gas exhausting modules disposed on the heating furnace, and respectively at a front position and a rear position of the heating furnace along the transporting direction; wherein each of the gas exhausting modules includes a casing and an exhausting channel, the casing having two ends respectively defined as a first end and a second end, the first end and the second end being opened, the first end connected to an exhaust pending region in the furnace body of the heating furnace, the exhausting channel having an upper end formed with an opening end; wherein the opening end of the exhausting channel is lower than the second end of the casing, and the exhausting channel has one side formed with a lateral opening, the lateral opening being connected to a blowing machine; and driving the blowing machine of the at least two gas exhausting modules to propel air into the exhausting channel of the at least two gas exhausting modules, so as to upward output a hyperbaric gas through the opening end of the exhausting channel of the at least two gas exhausting modules; when the hyperbaric gas is upward outputted through the opening end of the exhausting channel of the at least two gas exhausting modules, the gas with higher flow velocity providing a siphonic action for waste gas in the casing, so as to accelerate the waste gas to be exhausted from the furnace body of the heating furnace. 
     According to one exemplary embodiment of the present disclosure, the at least two gas exhausting modules are spaced out along the transporting direction on the heating furnace. The at least two gas exhausting modules are separately arranged at an upstream position and a downstream position respectively for exhausting gases from different temperature regions. A region temperature of the gas exhausting module at the downstream position is higher than a region temperature of the gas exhausting module at the upstream position. 
     According to one exemplary embodiment of the present disclosure, the gas exhausting module has a sensing device. The sensing device includes at least one of a temperature sensor, an aerometer and a gas sensor. 
     Thus, the present disclosure has advantages as follows. The at least two gas exhausting modules are disposed in the heating furnace, and are respectively arranged at a front position and a rear position of the heating furnace along the transporting direction, so that better gas exhaust efficiency can be achieved. Moreover, the gas exhausting modules are disposed separately and arranged at the front position and the rear position respectively, so that they can exhaust gas from different temperature regions. Therefore, the present disclosure enables the waste gases produced separately at different temperatures to be exhausted from the heating furnace in a regional manner and in a classified manner. The present disclosure can prevent waste gas from reacting with the workpiece, and avoid waste gas affecting the appearance and characteristic of the workpiece, so as to increase the product yield of the workpiece. Furthermore, the classified waste gases are easily to be processed. 
     For further understanding of the present disclosure, reference is made to the following detailed description illustrating the embodiments and examples of the present disclosure. The description is for illustrative purpose only and is not intended to limit the scope of the claim. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a gas exhausting system according to the present disclosure; 
         FIG. 2  is a partial enlarged view of part B in  FIG. 1  according to the present disclosure; 
         FIG. 3  is a cross-sectional view of the gas exhausting module according to the present disclosure; 
         FIG. 4  is a perspective view of the gas exhausting module according to the present disclosure; 
         FIG. 5  is a perspective view of the gas exhausting module exhausting gas according to the present disclosure; and 
         FIG. 6  is a flow chart of a method for exhausting gas according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     The aforementioned illustrations and following detailed descriptions are exemplary for the purpose of further explaining the scope of the present disclosure. Other objectives and advantages related to the present disclosure will be illustrated in the subsequent descriptions and appended drawings. 
     First Embodiment 
     Reference is made to  FIGS. 1 to 4 . The present disclosure provides a gas exhausting system, which is arranged in a heating furnace  1 . The type and structure of the heating furnace  1  are not limited thereto. For example, it can be a continuous heating furnace. The heating furnace  1  has a furnace body  11 , and the furnace body  11  can be equipped with a plurality of heaters  12  for heating a workpiece. The structure of the heater  12  can be, for example an electrical heater . . . etc., and is not limited thereto. The heating furnace  1  has a useful transporting structure for transporting the workpiece. The workpiece is able to be transported in the furnace body  11  along a transporting direction A. The workpiece can be inputted from one end (such as a left end of  FIG. 1 ) of the furnace body  11 , and outputted from the other end (such as a right end of  FIG. 1 ) of the furnace body  11 . The two ends of the heating furnace  1  can be further inputted a positive pressure airflow, so as to accelerate the gas exhaust. 
     The gas exhausting system includes at least two gas exhausting modules  2 . The at least two gas exhausting modules  2  are disposed on the heating furnace  1 , and respectively arranged at a front position and a rear position of the heating furnace  1  along the transporting direction A. That is, the at least two gas exhausting modules  2  are separately arranged on the heating furnace  1  along the transporting direction A. However, the amount of the gas exhausting modules  2  is not limited, three, four or five or more can be provided. 
     Each gas exhausting module  2  includes a casing  21  and an exhausting channel  22 . The casing  21  is a hollow casing made of a metallic board. The casing  21  has two ends which are respectively defined as a first end  211  and a second end  212 . The first end  211  and the second end  212  are opened, and in this embodiment, they are formed at a lower part and an upper part of the casing  21 , respectively. The first end  211  is connected to an exhaust pending region  13  in the furnace body  11  of the heating furnace  1 . The first end  211  can be directly connected to the exhaust pending region  13  in the heating furnace  1 , or the first end  211  can be connected to the exhaust pending region  13  in the heating furnace  1  by a pipe . . . etc. (not shown), so that an interior of the casing  21  is communicated with the exhaust pending region  13  in the heating furnace  1 . The exhaust pending region  13  is formed in the furnace body  11  of the heating furnace  1 , and the casing  21  can be formed with an exhausting pipe, so that the waste gas in the heating furnace  1  can be guided and upward expelled through the second end  212  of the casing  21 . 
     The exhausting channel  22  is disposed in the casing  21 . The exhausting channel  22  can be partitioned in the casing  21  by arranging a partition wall  221 . The partition wall  221  can partition off the interior of the casing  21  to form the exhausting channel  22 . An upper end of the exhausting channel  22  is formed with an opening end  222 , and the opening end  222  of the exhausting channel  22  is lower than the second end  212  of the casing  21 . The exhausting channel  22  has one side which is formed with a lateral opening  223 , and the lateral opening  223  is communicated with an external environment. In addition, the lateral opening  223  is connected to a blowing machine  23 . The lateral opening  223  can be directly connected to the blowing machine  23 , or the lateral opening  223  can be connected to the blowing machine  23  by a pipe (not shown). 
     When the blowing machine  23  is driven, the blowing machine  23  can propel air into the exhausting channel  22 , so as to upward output a hyperbaric gas through the opening end  222  of the exhausting channel  22 , as shown in  FIG. 5 . When the hyperbaric gas is upward outputted from the opening end  222 , the gas with higher flow velocity can provide a siphonic action for waste gas in the casing  21 , so as to accelerate the waste gas to be exhausted from the furnace body  11  of the heating furnace  1 . Thus, better gas exhaust efficiency can be achieved. According to the present disclosure, the interior of the casing  21  is formed with the exhausting channel  22  in a partitioned manner. The exhausting channel  22  is separated from the interior space of the casing  21  by the partition wall  221 . When waste gas is discharged through the interior of the casing  21 , residues will not remain in the exhausting channel  22 , and the opening end  222  of the exhausting channel  22  has a larger sectional area. Therefore, the exhausting channel  22  will not be choked. Moreover, by using the blowing machine  23  to output the hyperbaric gas, the cost can be lowered. 
     According to the present disclosure, the at least two gas exhausting modules  2  are disposed at a front and a rear positions respectively along the transporting direction A of the heating furnace  1 . In other words, at least two gas exhausting modules  2  are separately arranged at an upstream position and a downstream position respectively, so that they can exhaust gases from different temperature regions. A region temperature of the gas exhausting module  2  at the upstream position is higher than a region temperature of the gas exhausting module  2  at the downstream position. For example, the gas exhausting module  2  at the upstream position and the gas exhausting module  2  at the downstream position can be disposed in a region at 350 degrees Celsius and in a region at 450 degrees Celsius, respectively. When the workpiece is heated in the two different temperature regions, different waste gases and reaction products are produced. Take a circuit board for example, the organic compound materials, such as plasticizer, solvent etc. will produce different waste gases and reaction products in different temperature conditions. 
     The gas exhausting module  2  can further include a sensing device  24 , as shown in  FIG. 3 . The sensing device  24  can be disposed in the casing  21  of the gas exhausting module  2  or in the exhausting channel  22 . In this embodiment, the sensing device  24  is disposed in the casing  21  of the gas exhausting module  2 . The sensing device  24  can include at least one of a temperature sensor, an aerometer or a gas sensor, which is used to monitor data of waste gas, so as to ensure whether the system stability and adjustment are correct or not. For example, the temperature sensor can be used to detect the gas temperature; the aerometer can be used to detect the gas velocity for understanding the gas exhausting condition and whether the blowing machine  23  functions normally or not; and the gas sensor can be a CO sensor, a CO 2  sensor, a H 2 O sensor or a O 2  sensor respectively detecting CO, CO 2 , H 2 O and O 2  contained in waste gas. The gas sensor also can be a VOCs sensor, which can be used to detect the volatile organic compounds (VOCs). 
     Second Embodiment 
     Reference is made to  FIG. 6 . The present disclosure provides a method for exhausting gas, particularly related to a method for exhausting gas from the exhaust pending region of the heating furnace, which can accelerate exhausting waste gas. The method includes the steps as follows. 
     A gas exhausting system as shown in  FIG. 1  to  FIG. 5  is provided, and the gas exhausting system includes at least two gas exhausting modules  2 . The at least two gas exhausting modules  2  are disposed on the heating furnace  1 , and are respectively arranged at a front position and a rear position of the heating furnace  1  along the transporting direction A. Each gas exhausting module  2  has a casing  21  and an exhausting channel  22 . The casing  21  has two ends which are respectively defined as a first end  211  and a second end  212 . The first end  211  and the second end  212  are opened. The first end  211  is connected to an exhaust pending region  13  in the furnace body  11  of the heating furnace  1 . An upper end of the exhausting channel  22  is formed with an opening end  222 , and the opening end  222  of the exhausting channel  22  is lower than the second end  212  of the casing  21 . The exhausting channel  22  has one side which is formed with a lateral opening  223 , and the lateral opening  223  is connected to a blowing machine  23 . The gas exhausting system provided in the present embodiment is the same as that mentioned in the above embodiment, and it is thus not described here in detail. 
     Then, the method includes: driving the blowing machine  23  of the at least two gas exhausting modules  2  to propel air into the exhausting channel  22  of the at least two gas exhausting modules  2 , so that a hyperbaric gas is upward outputted through the opening end  222  of the exhausting channel  22  of the at least two gas exhausting modules  2 , as shown in  FIG. 5 . 
     When the hyperbaric gas is upward outputted through the opening end  222  of the exhausting channel  22  of the at least two gas exhausting modules  2 , the gas with higher flow velocity can provide a siphonic action for waste gas in the casing  21 , so as to accelerate the waste gas to be exhausted from the furnace body  11  of the heating furnace  1 . 
     To sum up, according to the present disclosure, the at least two gas exhausting modules are disposed in the heating furnace, and are respectively arranged at a front position and a rear position of the heating furnace along the transporting direction, so that better gas exhaust efficiency can be achieved. Moreover, the gas exhausting modules are disposed separately and arranged at the front position and the rear position respectively, so that they can exhaust gas from different temperature regions. When the workpiece is heated in the two different temperature regions, different waste gases and reaction products are produced. Therefore, the present disclosure enables the waste gases produced separately at different temperatures to be exhausted from the heating furnace in a regional manner and in a classified manner. The present disclosure can prevent waste gas from reacting with the workpiece, and avoid waste gas affecting the appearance and characteristic of the workpiece, so as to increase the product yield of the workpiece. Furthermore, the classified waste gases are easily to be processed. 
     The descriptions illustrated supra set forth simply the preferred embodiments of the present disclosure; however, the characteristics of the present disclosure are by no means restricted thereto. All changes, alterations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the present disclosure delineated by the following claims.