Tube bank structure and flow tube producing method
A technology for flow tubes and tube parts, which is applied in the field of manufacturing the flow tubes, can solve the problems of increasing the manufacturing cost of the flow tube bundle, condensing strips, complex structures, etc., and achieve the effects of improving maintainability, improving dispersion, and simplifying the structure
Inactive Publication Date: 2003-12-10
MITSUBISHI HEAVY IND LTD
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Problems solved by technology
In order to prevent the development of turbulence, a flow seat is provided to stabilize the stock flow immediately downstream of each rectangular outlet end, which leads to complex structures and undesirable maintainability
[0009] In Japanese Patent Application Laid-Open No. 56-148990, each flow tube is formed in such a way that its diameter increases from the inlet open end to the outlet open end, and while aligning the plurality of flow tubes, the diameter of each inlet open end is The inlet ends are welded to a plate, thus increasing the manufacturing cost of the flow tube bundle
In addition, to compensate for the reduced dispersion effect due to the lack of a stepped section, the length of the flow tube is very long, which can lead to the generation of coagulated strands after the paper stock flows out of the flow tube
Method used
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[0033] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. However, unless otherwise specified, the dimensions, materials, relative positions and other elements in this embodiment are only for explanation and do not limit the scope of the present invention.
[0034] Fig. 1 shows the structure according to flow pipe of the present invention, and it is installed on the pipe bundle of paper machine head box, and Fig. 1 (A) is a front view, and Fig. 1 (B) is along the direction of arrow A in Fig. 1 (A) view. figure 2 is a diagram for explaining a method of manufacturing the flow tube. image 3 is a schematic cross-sectional view of the tube bundle near the headbox, Figure 4 is along image 3 The view from the direction of the arrow B-B in the middle. Figure 5 is in the second embodiment in image 3 An enlarged partial cross-sectional view of the part Z circled in, Figure 6 yes Figure 5 The view al...
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The invention provides tube bank structure and a method of manufacturing a flow tube, which can improve the stabilization of the flow of stock in the tube bank of the headbox of a papermaking machine and prevent the development of turbulence and uneven concentration of stock flow by a simple and inexpensive means, resulting in speedup of papermaking process. Said flow tubes has a smaller diameter pipe portion of a circular cross-section in the inlet side, a larger diameter pipe portion connected to said smaller diameter pipe portion, a tapered pipe portion, and a rectangular pipe portion, the cross-sectional configuration of said tapered pipe portion being changed smoothly from circular to rectangular configuration.
Description
technical field [0001] The invention relates to a tube bundle structure of a paper machine head box comprising a plurality of flow tubes provided with paper stock (paper stock) flowing therein, and a method of manufacturing said flow tubes. Background technique [0002] In the tube bundle of the head box of a paper machine, a large number of paper raw materials (paper stock) flow through the flow pipes, which are used to stabilize the paper stock flowing there and guide the paper stock to the nozzles arranged in the downstream part of the pipe place. A steady flow of stock at the exit of the tube bundle is important and as the machines become faster, various techniques are implemented to increase the stabilization effect in the bundle to suppress turbulent flow of the stock at the exit of the tube bundle. [0003] A kind of improved technology is disclosed in the Japanese patent that publication number is 6-506274, and the front view of its tube bundle is as Figure 7 shown...
Claims
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IPC IPC(8): D21F1/02D21F1/06
CPCD21F1/026D21F1/02
Inventor 藤木惠一牧野哲夫伊泽明峰
Owner MITSUBISHI HEAVY IND LTD