Patent Publication Number: US-9850851-B2

Title: Carburetor base of engine

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims benefit to Chinese application number 201310059284.7 filed Feb. 26, 2013, and claims priority to PCT International Application No. PCT/CN2014/070895 filed Jan. 20, 2014, both of which are incorporated herein. 
     TECHNICAL FIELD 
     The present invention relates to an engine, and more particularly, to a carburetor base of an engine. 
     BACKGROUND ART 
     At present, in hand-held mowers (shears) and backpack-type lawn and garden machines, conventional two-stroke and four-stroke small-size general-purpose engines have been widely used, requiring operating personnel to hold the device with the hands or bear on the back during operation. 
     An engine usually includes a cylinder, a carburetor disposed at one side of the cylinder, and a carburetor base disposed between the carburetor and the cylinder. An air inlet channel is disposed on the carburetor base, so that liquid oil enters the cylinder after being vapourized by the carburetor. Furthermore, a pulsation hole is also disposed on the carburetor, negative pressure generated due to reciprocating motion of a piston being transferred into the carburetor through the pulsation hole to drive the carburetor to run up. A pulsation hole channel is disposed on the carburetor base. The pulsation hole channel is connected between the air inlet channel on the carburetor base and the pulsation hole, so as to introduce a negative pressure power inside the air inlet channel into the pulsation hole. However, the existing pulsation hole channel is directly connected to the air inlet channel on the carburetor base; in this way, the oil and gas in the air inlet channel is very easily liquefied to thereby block the cooling of the engine, so that the carburetor cannot run up stably. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide an improved carburetor base of an engine directed to the foregoing defects in the related art, which can prevent blocking of condensed fuel oil inside a pulsation hole channel thereof. 
     To realize the foregoing objects, the present invention employs a major technical solution as follows. A carburetor base of an engine is provided with an axial through hole and a pulsation hole channel, wherein: the carburetor base is further provided with an anti-blocking component, the anti-blocking component is mounted in the axial through hole and is provided with an air inlet channel, and the air inlet channel is communicated with the pulsation hole channel. 
     Furthermore, the present invention also provides a technical solution attached as follows. 
     The anti-blocking component is provided with an annular recess on an outer wall thereof, and the annular recess is communicated with the pulsation hole channel. 
     The annular recess is provided with a through hole. 
     The through hole is located above the air inlet channel. 
     The engine is provided with a cylinder and a carburetor, and the carburetor base is disposed between the cylinder and the carburetor. 
     The carburetor base is provided with a first end portion and a second end portion opposite to the first end portion, the first end portion is matched with the cylinder, and the second end portion is matched with the carburetor. 
     The anti-blocking component is a tubular article, and is tightly matched with the axial through hole. 
     Compared with the prior art, the present invention has the advantages that: by mounting the anti-blocking component inside the axial through hole and is provided with the air inlet channel, and making the air inlet channel communicated with the pulsation hole channel, the blocking of the condensed fuel oil inside the pulsation hole channel is avoided. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view of an engine corresponding to a preferred embodiment of the present invention. 
         FIG. 2  is an isometric view of a carburetor base and anti-blocking component assembly of the engine in  FIG. 1 . 
         FIG. 3  is an isometric view of the carburetor base in  FIG. 2 . 
         FIG. 4  is an isometric view of an anti-blocking component in  FIG. 2   
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Further not-limiting description will made on the technical solution of the present invention in detail below with reference to the preferred embodiments and drawings. 
     Referring to  FIG. 1 , an engine corresponding to the preferred embodiment of the present invention is a four-stroke petrol (gasoline) engine, which includes a cylinder  1 , a carburetor  3  and a carburetor base  5  disposed between the cylinder  1  and the carburetor  3 . The carburetor base  5  includes a first end portion  50  and a second end portion  52  opposite to the first end portion  50 , wherein the first end portion  50  is matched with the cylinder  1 , while the second end portion  52  is matched with the carburetor  3 . 
     Further referring to  FIG. 2  to  FIG. 4 , the foregoing carburetor base  5  is provided with an axial through hole  54 , a pulsation hole channel  56  and an anti-blocking component  60 . The pulsation hole channel  56  is disposed on the inner wall  51  of the axial through hole  54  and is provided with an anti-blocking gap  58 . The anti-blocking gap  58  is communicated with the pulsation hole  32  of the carburetor  3 . 
     The foregoing anti-blocking component  60  is mounted in the axial through hole  54  and is provided with an air inlet channel  53 , and the air inlet channel  53  can be communicated with the pulsation hole channel  56 . The anti-blocking component  60  is a tubular article, and is tightly matched with the axial through hole  54 . The outer wall  55  of the anti-blocking component  60  is provided with an annular recess  57 , and the annular recess  57  is provided with a through hole  59 . When the anti-blocking component  60  is mounted in the axial through hole  54 , the through hole  59  is located above the air inlet channel  53  (see  FIGS. 1 and 2 ). The annular recess  57  realizes more convenient manufacturing and assembling; and meanwhile, the position of the through hole  59  can be adjusted according to different use situations of the machine during manufacturing, so that the through hole is located above the air inlet channel  53 , and blocking of the through hole  59  is prevented. 
     In this way, the air inlet channel  53  communicates with the pulsation hole channel  56  through the foregoing through hole  59 ; moreover, by disposing the through hole  59  above the air inlet channel  53 , the fuel oil vapourized by the carburetor  3  will smoothly pass through the air inlet channel  53  and then enter the cylinder  1 , thus reducing and even avoiding the pulsation hole channel  56  or pulsation hole  32  from being blocked by the condensed fuel oil. The carburetor base  5  of the engine provided by the present invention has the advantages of novel structure and excellent running effect, and has excellent effects on the stable working of the engine. 
     It should be noted that the foregoing preferred embodiments are merely to explain the technical concepts and features of the present invention, intended to enable those familiar with this technology to understand the contents of the present invention and implement accordingly, but cannot limit the protection scope of the present invention for this account. Any equivalent change or modification made according to the spirit of the present invention shall all fall within the scope of the present invention.