Abstract:
A composite structure of a rotary valve includes a valve body including a containing hole of the disc, and a metal valve body corresponding to the shape of the valve body and formed in the valve body and covered by the valve body, wherein the metal valve body improves the explosion-proof, pressure-proof, and acid/base-resistant strength and circularity of the valve body in the manufacturing process of the rotary valve, the circularity of the valve body is suitable for connecting with a pipe line. A stem is mounted on the disc, wherein the stem is extended upwardly and combined with a handle/gear/electric/pneumatic/hydraulic, or chain operation component, such that the disc can be opened or closed.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a composite structure of a rotary valve, in particular to a metal valve body formed in a valve body of a rotary valve and completely covered by the valve body, so as to improve the explosion-proof, pressure-proof, and acid/base-resistant and keep the circularity of the valve body in the manufacturing process, thus the rotary valve is conducive to connect with a pipe, and archives a structural innovation of the rotary valve with the benefit of controlling the rotary valve to control a liquid flowing or not. 
     DESCRIPTION OF RELATED ART 
     According to commercially available rotary valves, the bodies thereof are made of plastic material, such as ABS plastic material (ACRYLONITRILE-BUTADIENE-STYRENE, propylene, butadiene and styrene copolymer), each body includes a disc which is capable to rotate and determine liquid flowing or not, and the valve body is made of plastic material to provide excellent fluidity and color uniformity in the heating and melting process and has advantages of non-toxic, toughness and impact resistance. The ABS plastic material has the above advantages, but the manufacturer has to consider how to increase the forming thickness of the valve body for ensuring that the valve body can withstand high pressure of flowing fluid in the pipe with the characteristics of the plastic material. In the injection molding process, plastic material has to be molded in very short time without deformation. Thus, people have been doing their utmost to improve the structural strength of traditional rotary valves. However, increasing the thickness of the valve body causes risks of increasing the rate of defective unit and decreasing the rate of non-defective unit in the manufacturing process. 
     Secondly, since the rotary valve is made of plastic material, of which pressure resistant is inadequate, thus delivery of high-pressure liquid can not be performed, problems of leakage fault can easily occur. 
     And to increase the pressure-resistant strength of the rotary valve itself, there is the structure of the valve body made of metal material. Its advantage is great resistant to pressure, but the drawback is that the metal valve body is easy to rust, and has a heavy weight; construction is not easy, and is vulnerably impacted by environmental pH value, as a result, can be damaged by erosion. 
     Therefore, the inventor of the present invention with extensive experiences of product designing and manufacturing researched the structural problem of the above rotary valve, and invented the rotary valve of the present invention to solve the above problem. 
     SUMMARY OF THE INVENTION 
     The main objective of the present invention is to provide a structural innovation of the composite structure for a rotary valve with good structural strength, pressure-resistant, and enough to resist the pH of the environment to prolong usage life, moderate weight, achieve easy construction, and improve product quality. 
     To archive above objective, the composite structure of a rotary valve of the present invention includes a containing hole of the disc of the valve body, which includes a valve seat for matching the containing hole of the disc, and a metal valve body is formed in the valve body and covered by the valve body, wherein the metal valve body improves the explosion-proof and pressure-resistant strength and circularity of the valve body in the manufacturing process of the rotary valve, the circularity of the valve body is conducive to connect with a pipe line, thus provides benefit of controlling the rotary valve to control the liquid flowing or not. 
     The composite structure of a rotary valve of the present invention can be widely used in all kinds of rotary valves, such as handle/gear/electric/pneumatic/hydraulic, or chain operation, so that the disc can be opened or closed. 
     The metal valve body of the rotary valve of the present invention located in the valve body is designed according to the shape of the valve body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of the handle-operation rotary valve of the present invention; 
         FIG. 2  is a side view of the valve body of the rotary valve of embodiment 1 of the present invention; 
         FIG. 3  is a cross sectional view of the cutting line A-A in  FIG. 2 ; 
         FIG. 4  is a cross sectional view of the cutting line B-B in  FIG. 2 ; 
         FIG. 5  is a side view of the metal valve body of embodiment 1 of the present invention; 
         FIG. 6  is a front view of the metal valve body of embodiment 1 of the present invention; 
         FIG. 7  is a front view of the metal valve body of embodiment 2 of the present invention; 
         FIG. 8  is a cross sectional view of the cutting line C-C in  FIG. 7 ; 
         FIG. 9  is a cross sectional of embodiment 2 of the present invention combined with a valve body; 
         FIG. 10  shows a rotary valve body applying the present invention in gear operation; 
         FIG. 11  shows a rotary valve body applying the present invention in pneumatic operation; 
         FIG. 12  shows a rotary valve body applying the present invention in electric operation. 
     
    
    
     FIGURES 
     Representative figure:  FIG. 3   
     Symbols of representative figure: 
     valve body  1 , valve stem groove  1   a , containing hole  10 , encircled body  11 , ribs  111 , encircled neck  12 , operation component base  13 , through hole  120 , metal valve body  3 , encircled part  30 , operation component setting part  32 , via hole  320   
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Herein below the composite structure of the rotary valve of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  shows an embodiment of the composite structure of the handle-operation rotary valve of the present invention. The present invention not only can be used in the embodiment of the rotary valve in  FIG. 1 , but also can be used in other type rotary valve, such as gear operation (refer to  FIG. 10 ), or pneumatic operation (refer to  FIG. 11 ), or electric operation (refer to  FIG. 12 ), or hydraulic operation or chain operation component rotary valve. The rotary valve of the present invention comprises valve body  1 , and a containing hole  10  of the disc is formed for a disc  2 ; the disc  2  comprises a stem  20 , which extends downwardly from a handle operation component  21 , or gear operation (refer to  FIG. 10 ) or pneumatic operation (refer to  FIG. 11 ), or electric operation (refer to  FIG. 12 ), or hydraulic operation, or chain operation component, and passes through disc  2 , whereby the distal end of which is located in a stem groove  1   a  of the valve body  1 , and fixed by a nut  22  over the handle operation component  21 , such that the disc  2  can be rotated to open or close by controlling the handle operation component  21 . 
     Refer to  FIG. 2-4 , the valve body  1  is made of ABS plastic material, such as ACRYLONITRILE-BUTADIENE-STYRENE, propylene, butadiene and styrene copolymer, the valve body  1  also can be made of other suitable plastic materials. The valve body  1  comprises an encircled body  11  which includes multiple bolt holes  110  formed on the encircled body  11  and the valve body  1  can be fixed by bolts via the bolt holes  110  when needed according to the environment under which the rotary valve is used. Multiple ribs  111  are formed on the surfaces of both sides of the encircled body  11 , which improve the impact resistance of the valve body  1 ; an encircled neck  12  is formed on the valve body  1  and comprises an operation component base  13  formed on the upper end of the encircled neck  12 . A through hole  120  is formed between the containing hole  10  of the disc and the operation component base  13  and the stem  20  is capable to perforate through the through hole  120  easily. A metal valve body  3  is located in the valve body  1  and covered by the valve body  1 . 
     Refer to  FIGS. 4-6 , showing embodiment 1 of metal valve body  3 ; the metal valve body  3  is an integrally molded structure. The rotary valve further comprises an encircled part  30  with multiple via holes  300  thereon, and the encircled part  30  is designed for fitting in the encircled body  11  of the valve body  1 , whereby the via holes  300  of the encircled part  30  correspond to the bolt holes  110  of the encircled body  11  of the valve body  1 . A neck  31  is formed on the encircled part  30  and comprises a passage  310  formed on the neck  31  for coordinating the encircled neck  12  of the valve body  1  and the through hole  120  thereof. An operation component setting part  32  is mounted on the neck  31  and comprises multiple via holes  320  for matching the operation component base  13  of the valve body  1 . 
     Refer to  FIGS. 7-9 , showing embodiment 2 of metal valve body  3 , and the embodiment 2 of metal valve body  3   a  is more suitable for a large rotary valve; of course it could be used in a small rotary valve too. The metal valve body  3  is an integrally molded structure. The rotary valve further comprises an encircled part  30  with multiple via holes  300  thereon, and the encircled part  30  is designed for fitting in the encircled body  11  of the valve body  1 , whereby the via holes  300  of the encircled part  30  correspond to the bolt holes  110  of the encircled body  11  of the valve body  1 . An upper neck  31   a  is formed on the encircled part  30 ; the upper neck  31   a  is an encircled shape, slightly different from the neck  31  of embodiment 1, comprising a through hole  310   a  for matching the encircled neck  12  of the valve body  1  and the through hole  120  thereof. Refer to  FIG. 9 , multiple elongated holes  312  are formed on the encircled wall  311  of upper neck  31   a  in order to enable the valve body  1 , while molding, to completely cover the upper neck  31   a , and avoid the destruction of metal valve body  3   a  due to environmental pH value. An operation component setting part  32  is mounted on the upper neck  31   a  and comprises multiple via holes  320  for matching the operation component base  13  of the valve body  1 . A lower neck  33  is formed on the encircled part  30 ; the lower neck  33  is an encircled shape corresponding to the setting location and shape of the upper neck  31   a , and comprises a via hole  330  for matching downwardly formation of the stem  20  of the valve body  1 . Refer to  FIG. 9 , multiple elongated holes  332  are formed on the encircled wall  331  of lower neck  33  in order to enable the valve body  1  to completely cover the lower neck  33 , and avoid the destruction of metal valve body  3   a  due to environmental pH value. The combination of encircled part  30 , upper neck  31   a  and lower neck  33  of metal valve body  3   a  can be either by welded or connected way. Refer to  FIG. 7  and  FIG. 8 , to combine the encircled part  30  and the upper neck  31   a , slots  313  are formed at two sides of upper neck  31   a , wherein the upper end of encircled part  30  is set, and then welded or connected integrally. Refer to  FIG. 7  and  FIG. 8 , to combine the encircled part  30  and the lower neck  33 , slots  333  are formed at two sides of lower neck  33 , wherein the lower end of encircled part  30  is set, and then welded or connected integrally. 
     In summary, the metal valve body  3  has to be put in a mold of the valve body  1  before molding the valve body  1 , referring to  FIG. 2  and  FIG. 9 . The metal valve bodies  3  and  3   a  are covered by the valve body  1  after the valve body is molded. Thus, the metal valve bodies  3  and  3   a  improve the structural strength of the valve body  1  without increasing the thickness of the valve body  1 . The shape of the metal valve body  3  corresponds to the shape of the valve body, such that the valve body is capable to sustain higher liquid flow pressure of pipe and increase the explosion-proof and pressure-resistant strength thereof, with the advantages of both plastic and metal valve bodies. Without increasing the thickness of the valve body in the manufacturing process, the consumption of the plastic material can be maintained, and the valve body can be rapidly formed and molded, such that the liquid in the pipe cannot leak and can avoid environmental contamination or waste of water resources. 
     DESCRIPTION OF SYMBOLS 
     valve body  1 , stem slot  1   a , containing hole of the disc  10 , encircled body  11 , bolt holes  110 , ribs  111 , encircled neck  12 , operation component base  13 , via hole  120 , disc  2 , stem  20 , handle  21 , nut  22  metal valve body  3 , encircled part  30 , through holes  300 , neck  31 , passage  310 , operation component setting part  32 , through holes  320 , 
     metal valve body  3   a , upper neck  31   a , via holes  310   a , encircled wall  311 , elongated hole  312 , slot  313 , lower neck  33 , via holes  330 , encircled wall  331 , elongated hole  332 , slot  333 .