Check valve and pump including check valve

Abstract

A check valve includes a tubular valve seat frame, a valve seat that is fixedly secured to the inside of the valve seat frame and has a communication hole through which a working fluid flows, and a valve body that is on the working fluid outflow side of the valve seat for opening and closing the valve seat. The valve seat frame, the valve seat, and the valve body are put into one unit so that the check valve has a simple structure and a good assembly property, and can be manufactured at low cost. The check valve is included, whereby a small, durable, and high-performance pump can be provided.

1 . A check valve comprising:
 a tubular valve seat frame and a valve seat being fixedly secured to the inside of said valve seat frame and having a communication hole through which working fluid flows; and   a valve body being on the working fluid outflow side of said valve seat for opening and closing said valve seat,   wherein said valve seat frame, said valve seat, and said valve body are put into one unit;   wherein said valve body is placed in a recess part provided on said valve seat frame so that it can move in a thickness direction, and   wherein a ring-like fixing member for said valve body to support the communication hole so as to be able to open and close the communication hole is provided on the recess part periphery of said valve seat frame.   
   
   
       2 . The check valve as claimed in  claim 1  wherein
 said valve seat is formed of a material having higher hardness than that of said valve seat frame and that of said valve body.   
   
   
       3 . The check valve as claimed in  claim 1  wherein
 said valve body is made up of a fixing part on the periphery and an opening-closing part of the communication hole of said valve seat and is provided on the side of said valve seat where working fluid flows out and the fixing part is fixedly secured to said valve seat frame.   
   
   
       4 . A check valve comprising:
 a tubular valve seat frame and a valve seat being fixedly secured to the inside of said valve seat frame and having a communication hole through which working fluid flows; and   a valve body being on the working fluid outflow side of said valve seat for opening and closing said valve seat,   wherein said valve seat frame, said valve seat, and said valve body are put into one unit, and   wherein said valve body is made up of a fixing part on the periphery, an opening-closing part roughly at the center, and a plurality of blade parts for concatenating the opening-closing part and the fixing part.   
   
   
       5 . The check valve as claimed in  claim 4  wherein
 said valve seat is formed of a material having higher hardness than that of said valve seat frame and that of said valve body.   
   
   
       6 . The check valve as claimed in  claim 4  wherein
 said valve body is made up of a fixing part on the periphery and an opening-closing part of the communication hole of said valve seat and is provided on the side of said valve seat where working fluid flows out and the fixing part is fixedly secured to said valve seat frame.