JP2012081371A - Screen changer for fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen changer for fluid, which is reduced in size and weight without reduction in filtering area.SOLUTION: A main inlet port of fluid is directly or indirectly provided on one side of a cubic casing, and two branch paths are extended from the main inlet port along the side to form sub-inlet ports of the casing at the respective ends. A cylindrical space is provided substantially at the center of the casing at a right angle to the inlet port, and two filtering means are removably inserted to the space from both axial sides thereof, and the inlet ports of the respective filtering means communicate with the branch paths through the sub-inlet ports of the casing. The outlet sides of the filtering means are located close to the center of the casing, and combined together to form a communicating path, and an outlet port is provided at the middle thereof to be opened to the outer surface near the axial center of the casing. A selector valve is provided at an intersection of the main inlet port with the branch paths to distribute an inlet flow to the whole or one side of the branch paths.

Description

  The present invention relates to a fluid screen changer.

  There existed what was shown to the following patent document 1 as a prior art. That is, a casing main body having a rotating rod hole for guiding a cylindrical rotating rod to rotate about its central axis, and a rotatable passage inserted into the rotating rod hole so that the movable passage is connected to the outer circumferential surface. And two rotation rods arranged in parallel in the axial direction, and a rotation drive shaft coupled to one or both ends of the rotation rod. And the movable passage provided in the said rotation rod penetrates on the straight line which passes through the diameter of this rod substantially, and the filtration means is inserted coaxially in it.

Japanese Patent No. 3806767

  However, in this technique, the movable passage provided in the rotating rod passes through a straight line passing through the diameter of the rod, and the filtering means is inserted coaxially therein. Therefore, the diameter and axial length of the passage are limited to the diameter of the rod. In other words, the passage volume is in principle limited by the rod diameter. Accordingly, the size of the filtering means accommodated therein, that is, the filtration area, is severely limited by the diameter of the rod. For this reason, in order to obtain a necessary filtration area, the diameter of the rod has to be increased, and an increase in the size and weight of the entire apparatus including the momentary casing must be accepted.

  An object of the present invention is to solve the above problems and to provide a fluid screen changer that can be reduced in size and weight without reducing the filtration area.

  The first of the means for solving the problems of the present invention is that one main inlet of the fluid is provided directly or indirectly to one side of the cubic casing, and from the main inlet, it is divided into two branches along the side, Each end serves as a secondary inlet for the casing. A cylindrical space perpendicular to the inlet is provided at a substantially central portion of the casing, and two filtering means are freely inserted and removed from both sides in the axial direction of the space, and the inlets of the respective filtering means are connected via the secondary inlet of the casing. To the branch path. The outlet side of the filtering means is on the casing central portion side, and they merge to form a communication path, and an outlet opening from the middle to the outer surface near the axial center of the casing is provided, and the branch path from the main inlet One switching valve is provided at the intersection of the two and the inlet flow is diverted to the entire branch path or to one side.

  A second problem-solving means of the present invention is that, in addition to the first means, one switching valve is provided at the intersection of the outlet and the communication path.

  The third problem solving means of the present invention is that, in addition to the first means or the second means, the outlet direction of the casing outlet is coaxial or perpendicular to the inflow direction of the main inlet.

  A fourth problem solving means of the present invention is that, in addition to the first means, the second means or the third means, the filtering means comprises a perforated plate and a screen on the surface thereof.

  The fifth means for solving the problems of the present invention is that, in addition to the first means, the second means or the third means, the filtering means comprises a bottomed filter tube and a screen attached to the surface, the inner surface or the intermediate surface thereof. .

  According to the present invention, it is possible to reduce the size and weight without reducing the filtration area.

It is a front view of one Example of this invention. It is X2-X2 sectional drawing of FIG. It is Y3-Y3 sectional drawing of FIG. It is Y4-Y4 sectional drawing of FIG. It is a figure corresponding to FIG. 2 of another Example. It is a figure corresponding to Drawing 2 of other examples. It is a figure corresponding to Drawing 3 of other examples. It is a graph explaining the effect of this invention. It is a graph explaining the effect of this invention.

An embodiment of the present invention will be described below with reference to the drawings.
1, 2, 3, and 4, the casing body 10 is a steel block having an outer shape that is a horizontally long rectangle in a front view, a rectangle in a side view, and a horizontally long rectangle in a plan view. One side of the rectangular parallelepiped casing (front surface) is provided with one main inlet 11 of the fluid, and the main inlet 11 is divided into two branch passages 11b along the side, each end being a secondary inlet 11a of the casing. It becomes.

  A cylindrical space 13 is provided at a substantially central portion of the casing 10 at a right angle to the inlet. Then, two filtering means 20 are freely inserted in and out from both sides in the axial direction of the space, and the inlets of the respective filtering means communicate with the branch path 11b through the secondary inlet 11a of the casing. The outlet side of the filtering means 20 is on the casing central part side, and they merge together to form the communication path 14, and an outlet 12 is provided that opens from the middle to the outer surface (rear surface) near the axial center of the casing. One of the inlet three-way switching valves 30 is provided at a crossing portion from the main inlet 11 to the branch path 11ba, and the inlet flow is divided into the entire branch path or one side.

  Here, the space 13 has a cylindrical shape having an axis along the horizontal side (front surface, rear surface) of the casing body, and is deeply opened from the left and right end surfaces of the casing body toward the center. And in the center part, it becomes the bottom 13a (it consists of a large diameter part and a small diameter part through a cutting | disconnection) which became a taper diameter reduction part, respectively. A circular communication path 14 is provided through both bottoms, and the outlet 12 opens from the center of the casing to the rear surface (rear surface). One outlet three-way switching valve 40 is provided at the intersection of the communication passage 14 from the outlet 12.

  The switching valves 30 and 40 have T-shaped flow passages 30b and 40b in the vicinity of the tips of the cylindrical valve rods 30a and 40a extending vertically, and the operation rods 30 and 40c extend from the end of the valve rod to the outside of the upper surface of the casing. The handle 30d, 40d is provided at the tip. Packings 30e and 40e are provided in the vicinity of the end of the valve stem to maintain liquid tightness with the holes in the casing. The flow paths 30b and 40b are T-shaped in a horizontal cross section including the axis.

  In the space 13, a filtering means 20 is inserted coaxially. The filtering means comprises a bottomed filter cylinder and is configured as follows. The reinforced porous cylinder 21 has a right cylinder and is concentric with the space, and a cylindrical screen 22 is mounted on the outer periphery (or the inner periphery and the middle). The bottom member 23 attached to one end of the reinforced porous cylinder with a screw has an outer center protruding outward. The guide member 24 has a tapered taper bar shape protruding on the inner axis of the bottom member. The other end of the reinforced porous cylinder 21 is fitted into the small diameter portion of the bottom 13a. Thereby, a space | interval is maintained between the cylindrical screen 22 and the inner surface of space, and the filtration chamber is comprised inside this space | interval and the reinforcement porous cylinder 21. As shown in FIG.

  At the opening end of the space 13, the flange portion of the lid 3 is fixed to the casing body with a bolt. The center of the lid rushes into the space. The filtering means 20 is attached to the lid 3 by the attachment member 4 so as to be able to advance and retract as follows. That is, the headed bolt 4a penetrating through the center axis of the guide member 24 and the bottom member 23 through the screw passes through the center of the lid 3 through the screw, and the nut 4b is screwed to the outside thereof. The lid 3 is provided with a discharge hole 3a used in backwashing described later.

The operating state will be described above.
During normal operation, the fluid entering from the main inlet 11 of the casing 10 is divided into two branch passages 11b, enters the filtration chamber from the left and right sub-inlets 11a, enters from the hole of the filter cylinder 20 with a screen, passes through the outlet of the filter cylinder, and then the casing. It is discharged from the outlet 12. The fluid containing impurities is filtered by the screen 22.

  When the screen on the left in FIG. 2 is clogged during screen backwashing, the flow of fluid in the left filtration chamber stops when the inlet switching valve 30 is turned 90 degrees to the left. At this time, the fluid due to the pressure on the outlet side of the casing enters the inside of the left porous cylinder 21 on the reverse side of the communication passage 14, flows in from the back surface of the screen 22, peels off the impurities attached to the screen together with the fluid, and discharges the holes. It is discharged from 3a. At this time, all the fluid passes through the right filtration chamber and flows out from the outlet 12, so there is no problem in operation. This time, when the inlet switching valve 30 is turned 90 degrees to the right, the flow of fluid in the right filtration chamber stops, and the right filtration cylinder is backwashed in the same manner.

  When replacing the left screen, when the left screen is replaced, if the inlet switching valve 30 is turned 90 degrees to the left and the outlet valve 40 is turned 90 degrees to the right, the fluid in the left filtration chamber is shut off, the lid 3 is removed, and the filter cylinder 20 is removed. Take it out and replace it with a new one. When changing the left screen, turn the switching valve 90 degrees backward. When there is no outlet switching valve 40, the entire molding line is stopped.

  FIG. 5 shows a perforated plate and a screen as the filtering means. A screen 6 is attached to the surface of the disk perforated plate 5, and this perforated plate is screwed into the large diameter portion of the bottom 13 a in the space 13.

  In the above, the outflow direction of the casing outlet is coaxial with the inflow direction of the main inlet. However, it may be perpendicular. That is, in FIGS. 6 and 7, the outlet 12 extends from the center of the communication path 14 and opens on the lower surface of the casing (or on the upper surface indicated by the phantom line). One outlet three-way switching valve 40 is provided from the outlet 12 to the intersection of the communication passage 14.

  The outlet switching valve 40 has a T-shaped flow path 40b in the vicinity of the front end of a cylindrical valve rod 40a extending in the front-rear direction. Provided. A packing 40e is provided in the vicinity of the end of the valve stem to maintain liquid tightness with the hole in the casing. The channel 40b is T-shaped in a vertical cross section including the axis thereof and extending left and right.

  8 and 9 are graphs for explaining the effects of the present invention. FIG. 8 shows the difference in diameter of the rotating rod between the present invention (bottomed filter tube 20 in FIG. 2) and the prior art (described in the background art) (bottomed filter tube similar to the present invention). The horizontal axis is the screen area, and the vertical axis is the diameter. FIG. 9 shows the difference in machine weight due to the difference in diameter of the rotating rod, where the horizontal axis is the screen area and the vertical axis is the weight. From this, it can be seen that due to the difference in structure, the diameter of the rotating rod is reduced, the entire machine is compact, lightweight, and cost is reduced.

  The present invention is not limited to the embodiments and embodiments described above, and includes various modifications without departing from the scope of the claims.

  The present invention is used in a fluid screen changer.

10 Casing body 11 Main inlet 11a Sub inlet
11b Branch path 12 Outlet 13 Space 14 Communication path 20 Filtering means 21 Reinforcing tube 22 Screen 23 Bottom member 24 Guide member 30 Inlet three-way switching valve 40 Outlet three-way switching valve 3 Lid 3a Discharge hole 4 Mounting member 5 Disc perforated plate 6 Circular screen

Claims (5)

One main fluid inlet is provided directly or indirectly to one side of the cubic casing, from which it divides into two branches along the side, each end being a secondary inlet for the casing,
A cylindrical space perpendicular to the inlet is provided at a substantially central portion of the casing, and two filtering means are freely inserted and removed from both sides in the axial direction of the space, and the inlets of the respective filtering means are connected via the secondary inlet of the casing. , Leading to the branch,
The outlet side of the filtering means is on the casing center side, and each merges to form a communication path, and an outlet opening from the middle to the outer surface near the axial center of the casing is provided,
A fluid screen changer characterized in that one switching valve is provided at a crossing portion from the main inlet to the branch path to divert the inlet flow to the entire branch path or to one side.
The fluid screen changer according to claim 1, wherein one switching valve is provided at a crossing portion between the outlet and the communication path.
3. The fluid screen changer according to claim 1, wherein the outlet direction of the casing outlet is coaxial or perpendicular to the inlet direction of the main inlet. 4. A fluid screen changer according to claim 1, wherein said filtering means comprises a perforated plate and a screen on the surface thereof.
4. A fluid screen changer according to claim 1, wherein said filtering means comprises a bottomed filter tube and a screen attached to the surface, the inner surface or the intermediate surface thereof.

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