Feeder channel for diluting fluid

Abstract

Feeder channel for diluting a fluid, in connection with a headbox of a paper machine includes one or more reservoir-type spaces for receiving diluting fluid. An aperture is formed in the reservoir-type space, wherein the diluting fluid can be conducted into the stock flow space of the headbox. One or more shut-off/adjustment members, for adjusting the flow of diluting fluid, is fitted into the feeder channel. The shut-off/adjustment member is a shut-off/adjustment device that can be moved in the longitudinal direction in the aperture formed in the wall of the reservoir-type space. The shut-off/adjustment member that is partly or wholly inside the aperture with one or more cavities and/or recesses, via which the flow of diluting fluid from the reservoir-type space either directly or via an intermediate piece into the stock flow space can be adjusted by moving the shut-off/adjustment member in the aperture.

1 . Feeder channel ( 1 ) for diluting fluid, such as for diluting water, which feeder channel is in connection with the headbox ( 10 ) of a paper machine and comprises one or more reservoir-type spaces ( 7 ), such as a chamber, for receiving diluting fluid, which space comprises one or more walls ( 4 ), and that an aperture ( 13 ) is formed in the reservoir-type space ( 7 ), via which aperture the diluting fluid can be conducted into the stock flow space ( 9 ) of the headbox, and that one or more shut-off/adjustment means ( 5 ), with which the flow of diluting fluid via the aforementioned aperture ( 13 ) can be adjusted, is fitted into the feeder channel ( 1 ), and that the shut-off/adjustment means ( 5 ) is a shut-off/adjustment means that can be moved in the longitudinal direction of an aperture that is in connection with the aperture ( 13 ) formed in the wall ( 4 ) of the reservoir-type space, characterized in that in the shut-off/adjustment means ( 5 ) that is partly or wholly inside the aperture there are one or more cavities and/or recesses ( 6 ,  14 )) via which the flow of diluting fluid from the reservoir-type space ( 7 ) either directly or via an intermediate piece ( 11 ) into the stock flow space ( 9 ) can be adjusted by moving the shut-off/adjustment means ( 5 ) in the aperture ( 13 ), and in that the shut-off/adjustment means ( 5 ) comprises a support surface or support surfaces ( 6 ″), which can rest on the inside surface ( 13 ′) of the aperture ( 13 ) for preventing vibration of the adjustment means ( 5 ) caused by the flow of the diluting fluid at least during operation of the shut-off/adjustment means. 
     
     
         2 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the support surface/support surfaces ( 6 ″) of the shut-off/adjustment means ( 5 ) are the side surface/side surfaces of the shut-off/adjustment means ( 5 ). 
     
     
         3 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the necks ( 5 ′) remaining between the cavities and/or recesses ( 6 ) comprise support surfaces ( 6 ″) that can rest on the inside surface ( 13 ′) of the aperture ( 3 ) for preventing vibration. 
     
     
         4 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the part comprising the support surface/support surfaces ( 6 ″) of the shut-off/adjustment means ( 5 ), which part can rest on the inside surface ( 13 ′) of the aperture ( 13 ), or alternatively the whole shut-off/adjustment means ( 5 ), is smaller in diameter than the diameter of the aperture ( 13 ). 
     
     
         5 . Feeder channel for diluting fluid according to  claim 1 , characterized in that by moving the shut-off/adjustment means the cross-sectional area of flow forming between the aperture ( 13 ) in the wall ( 4 ) and the shut-off/adjustment means ( 5 ) can be reduced or increased. 
     
     
         6 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the shut-off/adjustment means ( 5 ) is sleeve-shaped. 
     
     
         7 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the shut-off/adjustment means ( 5 ) is cylindrical, elliptical, polygonal or circular. 
     
     
         8 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the cavities and/or recesses ( 6 ,  14 ) in the shut-off/adjustment means ( 5 ) are formed in the shut-off/adjustment means such that they expand in the direction of the stock flow space ( 9 ), i.e. the cross-sectional area of them increases in the direction of the stock flow space. 
     
     
         9 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the cavities and/or recesses ( 6 ,  14 ) in the shut-off/adjustment means ( 5 ) comprise one or more straight and/or curved surfaces ( 6 ′,  14 ′). 
     
     
         10 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the cavities and/or recesses ( 6 ,  14 ) are concave in shape. 
     
     
         11 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the cavities and/or recesses ( 6 ,  14 ) are triangular or rectangular in shape. 
     
     
         12 . Feeder channel for diluting fluid according to  claim 1 , characterized in that one or more cavity or recess ( 6 ,  14 ) are in connection with each other. 
     
     
         13 . Feeder channel for diluting fluid according to  claim 1 , characterized in that the cavities or recesses ( 6 ,  14 ) are formed symmetrically in the shut-off/adjustment means ( 5 ). 
     
     
         14 . Feeder channel for diluting fluid according to  claim 1 , characterized in that an intermediate piece ( 11 ), such as e.g. a hose, a line or a pipe, is fitted into the aperture ( 13 ), in the wall, for conducting the diluting fluid from the reservoir-type space into the stock flow space. 
     
     
         15 . Feeder channel for diluting fluid according to  claim 1 , characterized in that an actuator ( 3 ) is connected to the shut-off/adjustment means with a connector part ( 16 ), for moving the shut-off/adjustment means ( 5 ). 
     
     
         16 . Feeder channel for diluting fluid according to  claim 15 , characterized in that the connector part ( 16 ) is wholly or partially fitted inside the reservoir-type space ( 7 ). 
     
     
         17 . Feeder channel for diluting fluid according to  claim 1 , characterized in that between the support surface and/or support surfaces ( 6 ″) of the shut-off/adjustment means and the inside surface ( 13 ′) of the aperture ( 13 ) in the wall ( 4 ) is a gap ( 18 ), which is preferably 0.05 mm-1 mm. 
     
     
         18 . Feeder channel for diluting fluid according to  claim 15 , characterized in that with the actuator ( 3 ) a linear movement of the shut-off/adjustment means ( 5 ) in the longitudinal direction of the aperture ( 13 ) is achieved.