JPS6214912A - Bucket type strainer - Google Patents

Abstract

PURPOSE:To inexpensively obtain a strainer having high grade, high capacity and excellent durability in a form suitable for mass production, by integrally forming a branched pipe part from the matrix pipe part of a pipe joint consisting of a matrix pipe and a branched pipe crossing at right angles in a seamless state by pull-off processing capable of arbitrarily setting the position of branching out and the number of branching out portions. CONSTITUTION:The branched part, where a fluid moves from a matrix pipe part 1 to a branched pipe part 11, is constituted of a bent pipe part 3 in a seamless state by branching out pull-out processing so that no welded part or corner part is formed and the outflow pressure loss of a fluid is reduced. Because the nozzle part comprising the seamless branched pipe part 11 is formed by utilizing a pipe joint branched out by the pull-off processing from the matrix pipe, a strainer having high reliability can be formed. As a result, the strainer having high grade, high capacity and excellent durability can be inexpensively prepared in a mass production system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bucket-type strainer equipped with an element that can remove and clean dust contained in a liquid or gas.

[Prior art]

As shown in Fig. 3, a conventional bucket-type strainer uses a cylindrical body A made of a steel pipe or steel plate formed into a circular cross section as its main body, and holes are bored in the main body to form an inlet B and an outlet C for the fluid. A short pipe with open ends is inserted into this hole and welded to form a branch pipe portion E, that is, a nozzle portion.

[Problem that the invention seeks to solve]

Therefore, in conventional products, the nozzle part is fillet welded to the main body part as a short pipe, or is half-circumferentially welded with a groove at most, so the degree of fusion at the welded part of the nozzle part to the main body part is low, In addition, the transition point from the main body to the nozzle forms a 90-degree angle, and the unevenness of the welded part not only creates high fluid flow resistance, but also causes a lot of turbulence and causes a significant fluid outflow pressure loss. In addition, it has the disadvantage that the strainer element is frequently damaged, and furthermore, the manufacturing is complicated, the manufacturing cost is relatively high, and the productivity is not improved.

The present invention eliminates these conventional problems, reduces flow resistance, prevents turbulence, and allows fluid to pass through the strainer under conditions approaching laminar flow. The purpose of this project is to provide a bucket-type strainer of high quality, high performance, and excellent durability, which is inexpensive and suitable for mass production, and which has good results in terms of the life of the element.

Means for Solving Problem c] The present invention provides a bucket-type strainer in which an element is housed in a cylindrical shell having a nozzle portion forming an inlet and an outlet for fluid, in which a branch pipe serving as the nozzle portion is The main body of the shell is a pipe joint in which at least one or more branch pipes are seamlessly formed into the main pipe by a drawing process in which the position and number of the starting points can be arbitrarily set on the main pipe. This is a bucket type strainer.

〔Example〕

To explain the present invention with reference to an example shown in FIG. 1, FIG. 1(a) shows a vertical bucket strainer, that is, a shell, in which the fluid input and output flow paths are stepless straight lines using pipe joints S where the main pipe and branch pipes are perpendicular to each other. , which is equipped with two branch pipes perpendicular to a cylindrical main pipe, and these branch pipes are on both sides of the main pipe, and the axis of each branch pipe forms the same plane as the main pipe axis, and the branch pipes are in the same plane. The branch pipes are of a straight fluid flow type in which the fluid input and output channels are formed in a straight line with no steps.
Figure (b) similarly shows that a vertical bucket strainer, i.e., a shell, has parallel linear fluid input and output channels with steps using pipe joints S where the main pipe and branch pipes are perpendicular to each other. tubes, the branch tubes are on both sides of the main tube, the axis of each branch tube is in the same plane as the main tube axis, but not on the same straight line, The pipe is of a fluid parallel movement type in which the fluid inlet and outlet flow paths are formed in parallel lines with steps, and in both cases, the branch pipe part 2 is the main pipe part 1 of the pipe fitting S where the main pipe and the branch pipe are orthogonal to each other. Alternatively, it is formed seamlessly and integrally by a drawing process in which the position and number of starting points can be arbitrarily set from 1', and the transition area from the main pipe part 1 or 1' to the branch pipe part 2 is all on the inner and outer surfaces. Both are formed as smooth curved pipe portions 3 with uniform curvature.

Inside the main pipe part 1 or 1', a strainer element 5 made of a porous cylinder of wire mesh, pitting metal, glass wool sintered metal, cloth, or other furnace material is installed inside the main pipe part 1 or 1' via a sheet 4. , a strainer is provided with a bottom plate 6 and a removable cover 7, a nozzle flange 8 is provided on the nozzle pipe serving as the branch pipe section 2, and a gel flange 9 to which the cover 7 can be fixed is connected to a leg 10. It is attached.

In the figure, 11 is an inlet, 12 is an outlet, 13 is a stopper, 1
4 is a gasket, 15 is a grip, 16 is a drain port, 1
7 is Ventro.

The branch pipe section 2, the bottom plate 6, and the flange 8.9 are fixed by welding means, but if necessary, they can be integrally and continuously formed without welding parts, that is, without any joints in the pipe line, by bulge processing. It can also have a tubular configuration.

Furthermore, although a vertical configuration is shown in each embodiment, a horizontal configuration may also be used depending on the relationship between the inlet 11 and the outlet 12.
For example, the openings of the branch pipe parts 2.2 in the main pipe part 1 are arranged in the vertical direction so that the fluid flows in the vertical direction.

In the straight-advance type bucket-type strainer with no step between the inflow and outflow axes shown in Fig. 1(a), the fluid flows from the inflow nozzle to the main body, or from the main body to the outflow nozzle. The pressure drop at h (m) is the inflow or outflow velocity Vl (m/5ec).

When the gravitational acceleration is g (m/sec") and the loss coefficient is ξ, the following relational expression holds true for the intermelting of these quantities.

g Here, in the case of inflow, that is, when the fluid flow expands rapidly, the value of the loss coefficient (ξ) is It is equal to 1.

Therefore, there is no difference in the inflow pressure loss of fluid between the conventional example and the example of the present invention in the stepless, straight-advance type bucket-type strainer. However, in the case of outflow from the strainer body to the outflow nozzle, When the flow suddenly decreases, if the transition point from the strainer body to the outflow nozzle is the conventional example (forming a 90° angle), the loss coefficient ( The value of ξ) is 0.5, whereas if the transition point is rounded as in the example of the present invention,
The value of the loss coefficient (ξ) is 0.06 or less. That is,
In the product related to the present invention, when there is no step difference between the inflow shaft and the outflow shaft, the fluid outflow pressure loss is extremely reduced to about one-tenth or less compared to that of the corresponding conventional product. I will do it.

Similarly, in the case of the bucket-type strainer of the flow path parallel movement type in which a step is set between the inflow axis and the outflow axis shown in Fig. 1(b), the example of the present invention has a higher It is possible to reduce fluid flow resistance and prevent turbulence, and also to sufficiently reduce fluid outflow pressure loss.

In the embodiment shown in Fig. 2, a pair of Heinenck T-type pipe joints S', in which the branch pipe part 11 is constructed seamlessly with one branch pipe extending from the main pipe part 1#, are connected by welding or other means in a step orthogonal shape. The main body of the shell is made up of a pipe joint in which the main pipe and branch pipe are orthogonal to each other by means of connection.

Fluid, for example, liquid enters the shell from the inlet 11 and passes through the strainer element 5 in a state approaching laminar flow, whereupon dust is captured and removed by the element and is led out from the outlet 12 as purified fluid. If the element becomes clogged and no longer functions, it should be cleaned and reused or replaced.

〔Effect of the invention〕

According to the present invention, the branch part where the fluid moves from the main pipe part to the branch pipe part is made up of a rounded bent pipe part made by drawing the head and has no joints, so there are no welded parts or corners, and the fluid flows smoothly. The outflow pressure loss can be significantly reduced, and the nozzle section, which consists of seamless branch pipe sections, is formed using a pipe joint that is drawn out from the main pipe, making it a highly reliable strainer. It is also possible to mass-produce bucket-type strainers with high quality, high performance, and excellent durability at low cost compared to conventional manufacturing methods.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are longitudinal cross-sectional views showing embodiments of the present invention,
FIG. 2 is a longitudinal sectional view of another embodiment, and FIGS. 3(a) and 3(b) are longitudinal sectional views of a conventional example. 1, l', 1''...Main pipe part, 11...Branch pipe part, 2.
・Branch pipe part, 3... Bent pipe part, 4... Sheet, 5...
・Strainer element, 6...Bottom plate, 7
...cover, 8.9...flange, s, s'...
Orthogonality of main tube and branch tube. pipe fittings. Patent applicant: Nippon Benkan Kogyo Co., Ltd. Representative patent attorney
Masayuki Takagi Representative Patent Attorney Pharmacist
Minoru Patent Attorney Yori 1) Takashi Part 3 Figure 3

Claims (1)

[Scope of Claims] 1. In a bucket-type strainer in which an element is housed in a cylindrical shell having a nozzle portion forming an inlet and an outlet for fluid, the position of the head of a branch pipe serving as the nozzle portion; A bucket-type strainer characterized in that the main body of the shell is a pipe joint in which at least one or more branch pipes are seamlessly formed into a main pipe by a drawing process that allows the main pipe to be arbitrarily set in number. 2. The shell is provided with two branch pipes perpendicular to a cylindrical main pipe, and the branch pipes are on both sides of the main pipe, and the axis of each branch pipe is in the same plane as the main pipe axis. 2. The strainer according to claim 1, wherein the branch pipes are of a straight fluid type in which a fluid input/output flow path is formed in a straight line without a step. 3. The shell is provided with two branch pipes perpendicular to the cylindrical main pipe, and the branch pipes are on both sides of the main pipe, and the axis of each branch pipe is the same as the main pipe axis. The strainer according to claim 1, wherein the strainer is of a fluid parallel movement type, which is configured in a plane but not on the same straight line, and whose branch pipes form fluid input and output flow paths in parallel linear shapes with steps. .