Patent Publication Number: US-8985078-B2

Title: Combustion chamber structure by using preheating net and spark plug to ignite

Description:
The current application claims a foreign priority to the patent application of Taiwan No. 101208223 filed on May 2, 2012. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a combustion chamber structure by using a preheating net and a spark plug to ignite. 
     2. Description of the Prior Art 
     The combustion chamber of a conventional engine is disposed in a cylinder. The existing combustion chamber structure comprises a spark plug screwed to a cylinder cover. The spark plug comprises a central electrode inserted in a ceramic insulation body. The ceramic insulation body is surrounded with a grounding metallic casing. Through the metallic casing, the spark plug is screwed to the cylinder cover. The top of the metallic casing is further fixedly connected with a grounding member. A gap is formed between the central electrode and the grounding member. Through the gap, the spark plug is electrified to ignite the mixing oil gas in the combustion chamber. 
     However, the existing combustion chamber structure uses the gap of the spark plug to discharge electricity to ignite the mixing oil gas. There is no device to preheat the oil gas or other device for complete combustion. When the existing combustion chamber structure is applied to a small-exhaust and high-speed model engine, the mixing oil gas in the combustion chamber is not complete combustion to exhaust a great amount of exhaust gas, which results in that the horsepower cannot release completely. The idling of the engine is not stable to extinguish the engine sometimes. 
     Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a combustion chamber structure by using a preheating net and a spark plug to ignite. The oil gas in the combustion chamber can be preheated. When igniting, the oil gas can be compete combustion to lower the exhaust gas. The present invention can decrease the exhaust gas so it is environment-friendly and can enhance horsepower and save oil. 
     The combustion chamber structure by using a preheating net and a spark plug to ignite of the present invention comprises a cylinder. The cylinder has a combustion chamber therein. The cylinder has an opening to communicate with the combustion chamber. The combustion chamber structure comprises a connection seat located on the opening and connected with the cylinder. The connection seat has a threaded hole which communicates with the combustion chamber. The spark plug is fixedly connected in the threaded hole. The spark plug has a central electrode therein. The central electrode has an axial discharge end at one end thereof toward the combustion chamber. The discharge end functions as a positive pole of the spark plug. The other end of the central electrode protrudes out of the spark plug to form a connection portion. The preheating net is transversely disposed in the combustion chamber. The preheating net is fixedly connected to the connection seat and disposed under the discharge end of the spark plug. A certain distance is defined between the discharge end of the spark plug and the preheating net. When electrified, the discharge end of the spark plug and the preheating net will generate an electric arc to ignite. 
     Through the distance between the discharge end of the spark plug and the preheating net, the spark plug is electrified to generate an electric arc to ignite the mixing oil gas. Through the design of the preheating net, the electric arc results in that the temperature of the preheating net rises, meanwhile, the mixing oil gas in the combustion chamber is preheated. When igniting, the oil gas in the combustion chamber will be complete combustion. The present invention enhances the burning efficiency through the preheating oil gas to stabilize the idling of the model engine, not extinguishing easily. The oil gas in the combustion chamber is complete combustion to enhance horsepower and to save oil. Besides, the present invention can decrease the exhaust gas so it is environment-friendly. The discharge end of the spark plug won&#39;t be influenced through the protection of the preheating nut. The discharge end will not be humid because of the excess missing oil gas. There is no problem to ignite the spark plug. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view according to a first embodiment of the present invention; 
         FIG. 2  is an exploded view according to the first embodiment of the present invention; 
         FIG. 3  is a sectional view taken along line  3 - 3  of  FIG. 1 ; and 
         FIG. 4  is a side sectional view according to the first embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
       FIG. 1  is a side view according to a first embodiment of the present invention.  FIG. 2  is an exploded view according to the first embodiment of the present invention. The present invention comprises a cylinder  10 , a connection seat  20 , a preheating net  30 , and a spark plug  40 . 
     The cylinder  10  has a combustion chamber  11  therein to accommodate mixing oil gas. The cylinder  10  has an opening  12  communicating with the combustion chamber  11  and four spaced connection holes  13  around the outer edge of the opening  12 . 
     The connection seat  20  is located on the opening  12 . The outer circumferential portion of the connection seat  20  has four spaced connection holes  22  corresponding in position to the connection holes  13  for connection of four bolts  23 , so that the connection seat  20  is connected to the cylinder  10  to seal the opening  12 . The connection seat  20  has a threaded hole  21 . The threaded hole  21  communicates with the combustion chamber  11 . 
       FIG. 3  is a sectional view taken along line  3 - 3  of  FIG. 1 . The preheating net  30  is transversely fixed to the connection seat  20 . The preheating net  30  is a grounding member as a negative pole. In this embodiment of the present invention, the preheating net  30  has a concentric annular fixing portion  32 , a central stop portion  31  and three support portions  33  which are equally spaced and extend from the stop portion  32 . The support portions  33  are fixedly connected to the outer circumferential edge of the threaded hole  21  of the connection seat  20 . 
       FIG. 2  is an exploded view according to the first embodiment of the present invention.  FIG. 4  is a side sectional view according to the first embodiment of the present invention. The spark plug  40  is fixedly connected in the threaded hole  21 . The spark plug  40  has a central electrode  41  therein. The central electrode  41  has an axial discharge end  42  at one end thereof toward the combustion chamber  11 . The discharge end  42  is located above the stop portion  31  of the preheating net  30 , functioning as the positive pole of the spark plug  40 . A certain distance is defined between the discharge end  42  of the spark plug  40  and the preheating net  30 . The discharge end  42  of the spark plug  40  as the positive pole and the preheating net  30  as the negative pole will generate an electric arc when electrified to ignite. The central electrode  41  has a connection portion  43  at another end thereof. The connection portion  43  protrudes out of the spark plug  40  and is electrically connected with a power source. 
     Referring to  FIG. 1  to  FIG. 4 , the present invention is mounted on a model engine. When the model engine is started, the electric current passes the electric electrode  41  through the connection portion  43  to the discharge end  42  to generate the electric arc through the distance defined between the discharge end  42  and the preheating net  30 . This results in that the temperature of the preheating net  30  rises, meanwhile, the mixing oil gas is poured into the combustion chamber  11  to spread and fill the whole combustion chamber  11 . Through the rise in the temperature of the preheating nut  30 , the temperature of the oil gas rises to preheat the oil gas. After that, the oil gas is ignited by the electric arc at the gap between the discharge end  42  and the preheating net  30  to expand to the whole combustion chamber  11 , so that the oil gas in the combustion chamber  11  is complete combustion to drive the engine. The present invention enhances the burning efficiency through the preheating oil gas to stabilize the idling of the model engine, not extinguishing easily. The oil gas in the combustion chamber  11  is complete combustion to enhance horsepower and to save oil. Besides, the present invention can decrease the exhaust gas so it is environment-friendly. 
     During the process that the mixing oil gas is poured into the combustion chamber  11  to spread and fill the whole combustion chamber  11 , the discharge end  42  of the spark plug  40  won&#39;t be influenced through the protection of the stop portion  31  of the preheating nut  30 . The discharge end  42  will not be humid because of the excess missing oil gas. There is no problem to ignite the spark plug  40 . 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.