JPS6313268Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dewatering device that can be applied to dewater a fiber suspension installed in the wet section of a paper machine.

(Prior Art) A conventional paper machine has an upper mesh 1, a lower mesh 2, a fiber suspension layer 3 between these meshes, and a continuously running formation component as shown in FIG. In this dewatering apparatus, a fiber suspension is dehydrated by attaching a large number of foils 7, 7a to a plurality of suction boxes 4, 5, 6 provided on the top or bottom side. In addition, the fourth
The figure shows an example in which suction boxes 4, 5, and 6 are installed only on the top side.

In this way, the suction boxes 4, 5, 6 are installed on the top side,
In a reverse suction box that dehydrates upwards, the slot portions 8 and 8a formed by the foils 7 and 7a are more likely to be blocked than when dehydrates downwards, depending on operating conditions such as the properties and concentration of the fiber suspension. The rear slot portion 8a tends to have a higher concentration of fiber suspension.
However, there was a drawback that the front slot portion 8 had a greater tendency to become clogged.

As a means of preventing blockage in the oil section, Japanese Patent Application No. 164278/1983 proposes to provide an adjustable weir in the flow path of the suction box, and to introduce low-pressure compressed air into the plate at the bottom of the suction box. A method has been proposed to increase the flow rate by thinning the dehydrated white water.

In a dehydration device consisting of several consecutive suction boxes,
Since the concentration of the fiber suspension gradually increases, the amount of white water dehydrated to the front suction box is greater than the amount of white water dehydrated to the rear suction box. Therefore, the flow velocity of white water in the flow path decreases as it moves toward the rear, and therefore the foil portion of the rear suction box tends to become clogged.

(Problems to be solved by the invention) The present invention was proposed to solve the above-mentioned drawbacks of the conventional technology. The purpose is to prevent the dehydrator slot from clogging.

(Means for solving the problem) In order to achieve this object, the present invention provides a fiber suspension dehydration device consisting of a plurality of consecutive suction boxes and a large number of foils connected to the suction boxes. The structure is such that a foil having a penetrating groove is attached to the boundary between the rear flow path and the following rear flow path.

(Function) Now, in the above configuration, a part of the white water dehydrated to the front flow path is passed through the groove of the foil and added to the rear flow path, and in the rear flow path, the white water dehydrated from the slot is mixed with the white water from the front flow path. The added white water increases the flow rate and prevents clogging.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 shows an embodiment of the present invention, and shows a reverse dewatering device capable of dewatering at the top, and a attached to the component. Now fiber suspension 3
remains sandwiched between upper net 1 and lower net 2,
Travel in the direction of arrow 12. A large number of solid foils 7, 7a are installed at appropriate intervals on the lower side of the dewatering device shown in FIG. 1, forming a large number of slots 8, 8a which serve as passages during dewatering. .

Also, the flow path 5a of white water connected to the front suction box 5
A partition plate 9 is provided between the flow path 6a connected to the rear suction box 6, and a groove penetrating in the same direction (flow direction) as the fiber suspension 3 travels in the lower part of the partition plate 9. A special foil 10 with 11 is installed. FIG. 2 shows details of this special foil 10, and FIG.
A cross-sectional view is shown.

Next, to explain the operation of the embodiment configured as above, a vacuum is applied to the suction boxes 4, 5, and 6, and the fiber suspension 3 is transferred to the upper net 1 and the lower net 2.
Driving while being stuck in the Fiber suspension 3
The dehydrated white water first passes through the leading flow path 4a and is sucked into the leading suction box 4. Subsequently, the white water is sucked into the front suction box 5 by passing through a number of slots 8 and the front passage 5a, and further passed through the slots 8a and the rear passage 6a by the rear suction box 6, where white water is sucked.

As described above, the fiber suspension 3 is dehydrated and has a high concentration at the outlet of the dehydrator, and is further transferred to a rear press section (not shown) as a wet paper 3a. Since the concentration of the fiber suspension 3 increases toward the rear of the dehydration device, the amount of white water 15 sucked into the rear suction box 6 is considerably smaller than the amount of white water 14 sucked into the front suction box 5. . Therefore, since the flow velocity in the rear flow path 6a is lower than the flow velocity in the front flow path 5a, blockage generally tends to occur in the rear slot 8a portion.

(Effects of the invention) Since the present invention is configured as explained in detail above, a part of the white water that has been dehydrated into the front flow path can be passed through the special foil groove and added to the rear flow path. In the rear flow path, the flow velocity increases due to the white water dehydrated from the slot and the white water added from the front flow path, making it possible to prevent blockage. Therefore, according to the present invention, in a fiber suspension dewatering device comprising a plurality of consecutive suction boxes and a large number of foils, it is possible to prevent the slots of the foils from being blocked.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a fiber suspension dewatering device showing an embodiment of the present invention, Fig. 2 is a detailed view of the main parts, Fig. 3 is a sectional view taken from X to X in Fig. 2, and Fig. 4 The figure is a side sectional view of a conventional fiber suspension dewatering device. Explanation of the main parts of the diagram, 1... Upper mesh, 2... Lower mesh, 3... Fiber suspension, 4, 5, 6... Suction box, 5a... Front flow path, 6a... Back flow Road, 7,
7a...oil, 8,8a...slot, 9...
...Partition plate, 10...Foil, 11...Groove.

Claims (1)

[Scope of utility model registration request] In a fiber suspension dehydration device consisting of a plurality of consecutive suction boxes and a large number of foils connected to the suction boxes, a foil having a penetrating groove is installed at the boundary between the front flow path and the rear flow path following this. A dehydration device featuring: