JPS5922000B2 - Improved inlet body for double disc refiner - Google Patents

Description

[Detailed description of the invention] Double disk stock stock is well known in the paper industry.

Dual disc fine machines are usually characterized by a disc having fine blades on both sides and rotating between a pair of stators. Stock is fed in two streams into the space between each side of the disk and the stator adjacent to each side of the disk. The flow of stock on both sides of the disc must be balanced for optimum operating efficiency and minimum maintenance costs. Furthermore, the flow must be evenly distributed around the inner circumference (small circumference) of the fine plate attached to the disc. As a result of these demands,
Many designers' emphasis has been placed on the structure of the entrance of the double disc fine machine. The inlet must be easy to clog and must ensure a minimum pressure drop within the inlet structure and at the interface between the incoming stock and the fine disc. No prosthetic device has ever existed that fully achieves the desired characteristics described above.

It is therefore a principal object of the present invention to provide a double disc refiner with improved working characteristics due to novel inlet flow regulating means.

It is another object of the invention to provide an improved feed inlet means for a double disc finer, the inlet means imparting little pressure drop to the stock being conveyed and being self-turbulent; Thereby, no pockets are provided in which pulp fibers may settle so as to alter the flow characteristics of the stock through the inlet means.

Another object of the present invention is to provide an improved inlet flow control means for a double disc finer which provides an inward thrust to the stock at the same time as a tangential flow vector. The above purpose is to provide two stock inlets of substantially identical design, except that one of them is required to be modified to accommodate the drive shaft for the cantilevered fine disc. This is substantially achieved by providing a double disc refiner having the means.

Here, identical design means that their flow-imparting properties are mirror images of each other. On either side of the disk, the flow entering the machine from the two inlets is such that it has a tangential velocity component in the same direction as the direction of rotation of the disk. Each of the inlet means includes an inlet piece or conduit, the inlet itself being arranged tangentially to the opening communicating with the refiner.

The flow from the conduit arranged in this contact direction enters the inlet chamber and encounters the wall portion of the chamber. The wall section slopes suitably toward the refiner, thereby imparting an axial thrust to the tangentially swirling inlet flow. This tangential spiral is provided along the direction of rotation of the refining disk. This stock is then discharged through an annular opening 36, which opening is aligned with a region close to the inner periphery of the refining disk.

Referring to Figure 1, a double disc refiner (Double disc refiner)
10 includes a housing 12 of a rotor 14 and two stators 16, the stators being mounted within the housing 12 facing opposite sides of the rotor 14.

The stock enters the sides of the rotor 14 at the inner edge 18 of the refining blade 20 and exits the refiner through the annular chamber 22 and the tangential outlet 24. The rotor 14 has a bearing 2
8 is arranged to rotate together with a shaft 26 attached to the shaft 26. Connected to the inside of the housing 12 are stock inlet means 30 which include a conduit 32 leading tangentially into a flow regulating chamber 34 .

The chamber 34 includes a radially extending rear wall 36 which has a helical structure and is inclined towards the disc of the refiner, so that the stock flow velocity vector impinges on the rear wall. The rear wall 36 is. It extends from a cylindrical plug 38 filling the central portion of the chamber 34 to the outer wall 41 of the chamber 34 . As a result, the paper cost is 3
6'The velocity and circular motion of the stock initially imparted by the tangential conduit 32 is maintained during the passage of the fluid through the inlet until it is discharged from the inlet in the annular opening 42. Furthermore, an axial velocity component is imparted to the stock by the rear wall 36, thereby facilitating feeding into the refiner discs. The shaft packing box and bearing are preferably housed within one of the inlets, as shown at 44, and this is done without any undue interference with the flow of the flow path through the inlet. .

The input robots and the conduits leading to them form a self-turbulent flow path for the stock, in which all the structural elements forming the flow path work together in imparting an effective movement to the stock to be fed into the double-disc refiner. It plays a supporting role.

[Brief explanation of the drawing]

FIG. 1 is a front view, partially in section, showing a double disc refiner of the present invention. Figure 2 shows the flow of stock through the stock inlet means;
It is a partial view similar to the figure. FIG. 3 is an end view from the refiner toward the rightmost inlet of FIG. 2; 10・
...Refiner, 12 ...Housing, 14
...Rotor, 16...Stator,
18...rim, 20...refining blade,
22...Ring, 24...Exit, 26...
...Shaft, 28...Bearing, 30...
...Inlet means, 32...Inlet conduit, 34...
...Flow control chamber, 36...Radially extending rear wall, 38...Cylindrical plug, 41...
Outer wall, 42... Annular opening, 44... Place where the shaft packing box is accommodated.

Claims (1)

[Claims] 1 In a double disc stock refiner having a pair of opposed inlet means, each of the inlet means directs the stock axially through the center of one of the stators to the refining boundary between the rotor and the stator. a generally cylindrical housing having a concentrically spaced cylindrical plug therein and defining an annular flow regulating chamber; a spiral rear wall slanted to
and an inlet conduit leading tangentially to the flow control chamber.