Abstract:
The present invention provides an exhaustion pipe in the mechanical field. The exhaustion pipe of the invention comprises a casing, on the sidewall of which a plurality of ventilation through holes are provided; and a cooling pipe mounted within the housing, which includes a heat dissipative air inlet end and a heat dissipative air outlet end, and on the sidewall of which a plurality of heart dissipative ventilation holes are provided. The exhaustion pipe has advantages including a simple structure, a rapid cooling effect and good safety performance.

Description:
BACKGROUND OF THE INVENTION 
     Field of Invention 
     The present invention relates to an exhaustion pipe in the mechanical field. 
     Related Art 
     The exhaustion system refers to a system for collecting and discharging exhaust gas, including an exhaust manifold, an exhaustion pipe, a hush pipe and a resonator. The exhaustion pipe is one of the important parts of the exhaustion system. The exhaust gas has a large amount of heat. Not only does the exhaust gas discharged have a high temperature, but also the heat of the exhaust gas is transferred to the exhaustion pipe, for which the exhaustion pipe will keep having a high temperature. To this end, vehicles and persons behind the exhaustion pipe will be put in a dangerous position. 
     The exhaustion pipes available on the market simply discharge the exhaust gas to the atmosphere. The temperature of the exhaust gas and the exhaustion pipe is higher than normal discharge temperature, which brings a higher risk. 
     For example, in Chinese patent publication CN104564291A, the gas discharge space of the exhaustion pipes is added by increasing the number of channels of the exhaustion pipe, which is complicated in production and mounting. Even though heat dissipation is achieved, the production cost is increased. Such an exhaustion pipe could not achieve a good heat dissipation effect within a short time period as external air could not enter into the pipe. And after being continuously sued, the heat dissipation efficiency of the exhaustion pipe is greatly decreased, for which the discharge temperature requirement could not be obtained. 
     For example, in Chinese patent CN203822436U, a number of coolers are added to the exhaustion pipe. Such an exhaustion pipe has a larger number of components and a complicated configuration. The coolers are transversely mounted in the exhaustion pipe by being transverse (i.e., substantially perpendicular) to the exhaust tailpipes. The air and the exhaust gas are evenly mixed, which nevertheless could hinder discharge of the exhaust gas and is not suitable for large-power exhaust gas discharge. 
     For example, in Chinese patent publication CN104481660A, a heat dissipation layer is added to the outer side the exhaustion pipe and on the outer sidewall of the exhaustion pipe. The heat dissipation layer is of a high cost and tends to be damaged for being mounted on the outer side. The heat dissipation efficiency of the exhaust gas within the exhaustion pipe is largely decreased and the discharge temperature requirement could not be met. 
     To sum up, an exhaustion pipe having a simple configuration, a fast heat dissipative effect and safe performance, is required to address the shortcomings of configuration of the exhaustion pipe. 
     SUMMARY OF THE INVENTION 
     In order to address the aforesaid defects, the present invention provides an exhaustion pipe having a simple structure, rapid heat dissipation and good safety performance. 
     It is therefore an object of the present invention to provide an exhaustion pipe comprising:
         a casing, on the sidewall of which a plurality of ventilation through holes  11  are provided; and   a cooling pipe mounted within the housing, which includes a heat dissipative air inlet end and a heat dissipative air outlet end, and on the sidewall of which a plurality of heat dissipative ventilation holes are provided.       

     In the exhaustion pipe according to an embodiment of the invention, an edge of each of the heat dissipative ventilation holes extends to the interior of the cooling pipe to form an air deflector which forms a ventilation opening together with the heat dissipative ventilation hole. 
     In the exhaustion pipe according to an embodiment of the invention, the heat dissipative ventilation holes are of a semi-circular shape, and the air deflectors are fixedly connected with an arc edge of the heat dissipative ventilation holes. 
     In the exhaustion pipe according to an embodiment of the invention, the air deflectors are tilted toward the heat dissipative air outlet end. 
     In the exhaustion pipe according to an embodiment of the invention, each of the air deflectors includes an air guide side which is configured as an arc concave face. 
     In the exhaustion pipe according to an embodiment of the invention, the casing includes a connecting tail pipe and a heat dissipative tail pipe, and the cooling pipe is fixedly connected with the connecting tail pipe and inserted into the heat dissipative tail pipe. 
     In the exhaustion pipe according to an embodiment of the invention, the cooling pipe, the connecting tail pipe and the heat dissipative tail pipe are all configured as a hollow cylinder, and the diameter of the connecting tail pipe is smaller than that of the heat dissipative tail pipe. 
     In the exhaustion pipe according to an embodiment of the invention, the end of the heat dissipative tail pipe at the exhaustion direction is an oblique surface. 
     In the exhaustion pipe according to an embodiment of the invention, the casing further includes a connecting element mounted between the connecting tail pipe and the heat dissipative tail pipe, the connecting element is configured as a round table and the ventilation through holes are provided on the outer sidewall of the connecting element. 
     In the exhaustion pipe according to an embodiment of the invention, the cooling pipe, the connecting tail pipe, the heat dissipative tail pipe and the connecting element are all coaxially disposed. 
     Compared with the prior art, the exhaustion pipe of the invention has a simple structure, in which the exhaust as enters the heat dissipative air inlet end through the connecting tail pipe and then enters into the cooling pipe. Air enters into the casing through the ventilation through holes and follows within the casing. The heat dissipative ventilation holes are provided on the cooling pipe, and the air within the casing is drawn into the cooling pipe to be mixed with the exhaust gas when the exhaust gas is discharged at a high speed, for which the temperature of the exhaust gas is dramatically decreased and the air within the casing is continuously transferred into the cooling pipe through the ventilation through holes. Therefore, the exhaustion pipe of the invention could be cooled rapidly. Meanwhile, the air deflectors are tilted toward the heat dissipative air outlet end. Consequently, the air entering into the cooling pipe from the casing is led by the air deflectors to the air outlet end of the cooling pipe, which provides a good cooling effect and good safety performance. The exhaustion pipe of the invention is convenient for large-scale production. 
     Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a diagram of a preferred embodiment of the invention; 
         FIG. 2  is a front view of a preferred embodiment of the invention; 
         FIG. 3  is an enlarged view of the A-A portion; 
         FIG. 4  is an enlarged view of the portion B of  FIG. 3 ; and 
         FIG. 5  is an enlarged view of the portion  13  of  FIG. 3  in another form. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention shall not be limited to these embodiments. 
     As shown in  FIGS. 1 and 2 , the exhaustion pipe of the invention comprises:
         a casing  10 , on the sidewall of which a plurality of ventilation through holes  11  are provided; and   a cooling pipe  20  mounted within the housing  10 , which includes a heat dissipative air inlet end  21  and a heat dissipative air outlet end  22 , and on the sidewall of which a plurality of heat dissipative ventilation holes  23  are provided.       

     The exhaustion pipe of the invention has a simple configuration and is adapted for large-scale production. The solid arrow direction in the figures indicates the air flow direction. The external air enters into the casing  10  via the ventilation through holes  11 , flows within the casing  10 , and then enters into the cooling pipe  20  via the heat dissipative ventilation holes  23  to mix with the exhaust gas for cooling purposes. The hollow arrow direction indicates the exhaust gas flow direction. The exhaust gas enters from the heat dissipative air inlet end  21  and is discharged from the heat dissipative air outlet end  22 . 
     As the exhaust gas flows at a high speed within the cooling pipe  20  and draws strong attraction to the air within the casing  10 , the air within the casing  10  is drawn into the cooling pipe  20  via heat dissipative ventilation holes and mixed with the exhaust gas. The temperature of the exhaust gas is decreased abruptly. The air within the casing  10  is continuously transferred to the cooling pipe  20  through the ventilation through holes  11 . As such, the exhaustion pipe of the invention could achieve first cooling. 
     In a preferred embodiment, the edge of the heat dissipative ventilation hole  23  extends to the interior of the cooling pipe  20  to form an air deflector  24  which forms a ventilation opening  25  together with the heat dissipative ventilation hole  23 . 
     The air within the casing  10  enters into the cooling pipe  20  through the heat dissipative ventilation holes  23 . The air deflector  24  is configured to guide the air, so that the air enters into the cooling pipe  20  through the ventilation openings  25 . 
     In a preferred embodiment, as shown in  FIG. 3 , the heat dissipative ventilation holes  23  are of a semi-circular shape. The air deflectors  24  are fixedly connected with the arc edge of the heat dissipative ventilation holes  23 . 
     There could be various shapes of the heat dissipative ventilation holes  23 , for example a triangular or square shape, as long as air could pass through these holes. Preferably, the heat dissipative ventilation holes  23  are semi-circular and the arc edges of the heat dissipative ventilation holes  23  are connected with the air deflectors  24 . The connection part of the air deflector  24  with the heat dissipative ventilation hole  23  has a smooth-curve transition, for which the air could enter into the cooling pipe  20  via the ventilation openings in a more convenient manner. 
     In a further preferred embodiment, as shown in  FIG. 4 , the air deflectors  24  are tilted toward the heat dissipative air outlet end  22 . 
     The casing  10  is filled with air and the ventilation through holes  11  are continuously supplied with external air. The air deflector  24  are obliquely disposed and tilted toward the heat dissipative air outlet end  22 . The cooling pipe  20  is in communication with the casing  10  through the ventilation openings  25 . The attraction brought by high-speed exhaust gas transfer draws air within the casing  10  into the cooling pipe through the ventilation openings  25 . As such, the direction of transmission of the inhaled air is the same as that of the exhaust gas. The direction of transmission of the air from the casing  10  to the cooling pipe  20  is led by the air deflectors  24  to the air outlet end of the cooling pipe  20 , so that reflux is prevented and temperature is quickly decreased. 
     In a further preferred embodiment, the air deflector  24  includes an air guide side  241  which is configured as an arc concave face. 
     The air guide side  241  is a side of the ventilation opening and air passes through the air guide side  241 . The air guide side  241  is an arc concave face to efficiently lead air into the cooling pipe  20  to he mixed with the exhaust gas, so that heat is dissipated. The arc concave face is used as the air guide side  241  to alter the air flow direction so many times that the air flow speed is decreased and the exhaust gas could be mixed with the air sufficiently. 
     Referring to  FIG. 5 , the air deflector  24  is configured as a planar surface to lead air into the cooling pipe  20  to be mixed with the exhaust gas. Accordingly, heat is dissipated. 
     In a preferred embodiment, the casing  10  includes a connecting tail pipe  12  and a heat dissipative tail pipe  13 . The cooling pipe  20  is fixedly connected with the connecting tail pipe  12  and inserted into the heat dissipative tail pipe  13 . 
     The connecting tail pipe  12  receives exhaust gas and transfers the exhaust gas from the heat dissipative air inlet end  21  to the cooling pipe  20 . The air within the heat dissipative pipe  13  is used a heat absorption layer and absorbs a part of heat. The air enters into the ventilation openings  25  through heat dissipative ventilation holes  23  and into the cooling pipe  20  to mix with the exhaust gas which exchanges heat with the air, so that the temperature is rapidly decreased. The mixture of exhaust gas and air is discharged from the heat dissipative air outlet end  22  of the cooling pipe  20  and then exits out of the casing  10 . 
     Preferably, the cooling pipe  20 , the connecting tail pipe  22  and the heat dissipative tail pipe  13  are all configured as a hollow clinder. The diameter of the connecting tail pipe  12  is smaller than that of the heat dissipative tail pipe  13 . 
     The cooling pipe  20 , the connecting tail pipe  22  and the heat dissipative tail pipe  13  could be of various shapes and preferably be of a hollow cylinder for ease of mounting. 
     The diameter of the connecting tail pipe  12  is smaller than that of the heat dissipative tail pipe  13 . Consequently, a space is formed between the cooling pipe  20  and the heat dissipative tail pipe  13 , which guarantees discharge of the exhaust gas out of the casing  10  and prevents the exhaust gas directly escaping out of the ventilation through holes  11  to cause danger. And the amount of air entering the casing  10  is significantly increased, which improves mixture of the exhaust gas with the air. When the exhaust gas transmits at a high speed within the cooling pipe  20 , a huge attraction is formed to draw the air entering the casing  10  into the cooling pipe  20 . The air and the exhaust gas mix with each other within the cooling pipe  20 , so as to reduce the temperature of the gas within the cooling pipe  20 . 
     Preferably, the end of the heat dissipative tail pipe  13  at the exhaustion direction is an oblique surface which could discharge the exhaust gas downward and provide a safer configuration. 
     In a preferred embodiment, the casing  10  further includes a connecting element  26  mounted between the connecting tail pipe  12  and the heat dissipative tail pipe  13 . The connecting element  26  is configured as a round table. The ventilation through holes  11  are provided on the outer sidewall of the connecting element  26 . 
     If the ventilation through holes  11  are disposed on the connecting tail pipe  12 , the exhaust gas within the connecting tail pipe  12  will be leaked and the high temperature exhaust gas thus leaked would destroy the exhaustion pipe and the like. And if the ventilation through holes  11  are disposed on the heat dissipative tail pipe  13 , a pail of the heat dissipative through holes  23  would fail and a large amount of air could not be absorbed, for which the cooling efficiency of the cooling pipe  20 . The ventilation through holes  11  could be disposed on the connecting element  26  in such a manner that the exhaust gas will not be leaked and the cooling efficiency of the cooling pipe could be guaranteed. 
     The cooling pipe  20 , the connecting tail pipe  12 , the heat dissipative tail pipe  13  and the connecting element  26  are all coaxially disposed. 
     The cooling pipe  20  and the connecting tail pipe  12  are coaxially provided, so that the flow direction of the exhaust gas will be in the same direction to prevent the exhaust gas running unevenly to cause danger. The heat dissipative tail pipe  13  and the cooling pipe  20  are coaxially provided, so that the cooling pipe  20  will be mounted in the middle of the heat dissipative tail pipe  13  and the cooling pipe  20  has the same air layer thickness. Meanwhile, the air entering the cooling pipe  20  has substantially the same amount and is kept in a stable state within the cooling pipe  20 , thereby providing a safer and better cooling effect. 
     The specific embodiments described herein are merely illustrative of the spirit of the invention. it is apparent to those skilled in the art that various modifications, amendments and alternatives can be made to these embodiments without departing from the spirit or scope defined by the appended claims. 
     LIST OF REFERENCE NUMERALS 
       10  Casing 
       11  Ventilation Through Hole 
       12  Connecting Tail Pipe 
       13  Heat Dissipative Tail Pipe 
       20  Cooling Pipe 
       21  Heat Dissipative Air Inlet End 
       22  Heat Dissipative Air Outlet End 
       23  Heat Dissipative Ventilation Hole 
       24  Air Deflector 
       241  Air Guide Side 
       25  Ventilation Opening 
       26  Connecting Element