JPH073704U - strainer - Google Patents

Abstract

(57) [Summary] [Purpose] In addition to exhibiting an excellent filtration function, long and narrow hairs can be easily removed by backwashing, and mounting can be facilitated. [Structure] A net-like or porous partition plate 8 is provided in a substantially cylindrical container 1 having pipe connecting portions 4 and 7 at both ends in the axial direction, and is positioned on the downstream side in the normal flow direction of a fluid. 1 is accommodated in the container 1 with a large number of balls 9 (9A, 9B) that are fixed by intersecting with the axis of 1 and that are blocked by the partition plate 8 when the fluid is flowing normally and that are free to move when backwashing. Become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a strainer which is used for removing dust and the like contained in a fluid by being interposed in a pipe connecting portion such as a plate heat exchanger.

[0002]

[Prior art]

 Conventional strainers include those constructed by inserting punching metal or wire mesh into the pipe connection section in a direction orthogonal to the flow direction, and those formed by arranging multiple bars in a saw-like shape. It was used relatively often.

[0003]

[Problems to be solved by the device]

 Among the conventional strainers having the above-mentioned structure, the former strainer has a drawback that soft and slender items such as hair and fibers are easily entangled, and once entangled, it is difficult to remove without disassembling the strainer itself. There is. In the latter case, the spacing between the bars is relatively large, and the filtration function is not sufficiently exerted.

Further, instead of the strainer as described above, it is also known that sand, pebbles, or ceramic pieces are laid in layers in a tank to form a filtration layer, but this tends to be large. However, there is a difficulty in attaching it to the pipe connection part, especially in the case of sand and pebbles, it is in a densely packed state, so if dust gets into this, even if it is backwashed, it will be completely It cannot be removed and is not practical.

The present invention has been made in view of the above circumstances, and not only can exhibit an excellent filtering function, but also can trap long slender dust and the like, and easily remove it by backwashing. It is an object of the present invention to provide a strainer that can be easily mounted on a pipe connection part and used.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a strainer according to the present invention is placed in a substantially cylindrical container having pipe connecting portions at both ends in the axial direction, and is placed in a net-like shape by being positioned on the downstream side in the forward flow direction of the fluid. A porous partition plate is fixed by intersecting the axis of the cylindrical container, and is blocked by the partition plate when the fluid is flowing normally in the container, and is movable when backwashing. It accommodates the ball. The ball does not only mean a hollow ball, but also a solid ball.

[0007]

[Action]

 According to the present invention, a large number of balls are deposited by being blocked by a mesh or porous partition plate during normal flow of the fluid, so that the fluid passes through the minute gaps between the balls during the normal flow. While the fluid flows smoothly, the dust and solids contained in the fluid are caught in the balls and cannot pass through the minute gaps, so the fluid is sufficiently filtered. Next, when the fluid is made to flow backward, the balls float in the container, so that the dust entangled in the balls, particularly long hair, is easily separated and discharged. Therefore, long hair can be easily removed by backwashing while sufficiently utilizing the above-mentioned function. Further, the container has a substantially cylindrical shape and can be relatively compacted, and can be easily attached to various pipe connection parts for use.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing a strainer according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a substantially cylindrical container made of metal or the like, which includes a cylindrical portion 2 and a lower small-diameter cylindrical portion 4 connected to a lower end of the cylindrical portion 2 via a funnel-shaped portion 3. An upper small-diameter tubular portion 6 having a flange 5 as one pipe connecting portion is connected and fixed to the upper end side of the cylindrical portion 2 at the outer end thereof, and the lower small-diameter tubular portion 4 is provided. A flange 7 is formed at the outer end of the pipe as another pipe connecting portion.

In the container 1, a large number of partition plates are provided at positions downstream of the normal flow direction (white arrow) of the fluid, specifically, at the boundary positions between the cylindrical portion 2 and the funnel-shaped portion 3. A multi-hole plate or mesh 8 having small holes is fixed orthogonally to the axis (streamline) of the container 1. Reference numeral 9 denotes a large number of balls housed in the container 1 in a state of being blocked by the upstream side surface 8a of the mesh body 8 in the forward flow direction, that is, in a sinking state, and having a specific gravity larger than 1. As shown in FIG. 2, the mesh body 8 is formed to have a small diameter that does not pass through the openings 8b of the mesh body 8, and when the fluid is back-flowed (backwashed) as shown by the black arrow, the container 1 is It is set to be able to float inside.

A bypass pipe 10 is connected to the container 1 in a state of straddling the net body 8 and a part of the fluid from the upstream side of the net body 8 at the time of backflow is disposed at the deposition position of the balls 9. The swirl flow P is generated in the container 1 by returning to the downstream side. Reference numerals 11 and 12 are a throttle mechanism and a check valve, respectively, which are interposed in the bypass pipe 10.

The strainer configured as described above is used in various devices that need to prevent dust and solids from flowing into the interior. For example, strainers S1 and S2 are respectively connected to the inlet pipe 32 (32A, 32B) and the outlet pipe 33 (33A, 33B) of the plate heat exchanger 31 as shown in FIG. Is inserted and connected so that it faces the upstream side during normal flow. This is because the container 1 is formed in a substantially cylindrical shape and is compact, so that the pipes 32 and 33 can be easily connected. Reference numerals 34 and 35 are normally open on-off valves inserted in the inlet and outlet pipes 32A and 33A, and 36 and 37 are normally closed on-off valves connected between the inlet pipe 32A and the outlet pipe 33A.

In FIG. 3, during normal use, the fluid flows in the forward flow direction indicated by the white arrow. At this time, in each strainer S1 and S2, a large number of balls 9 in the container 1 are placed on the mesh body 8, That is, it is deposited in a state of being sunk on the upstream side surface 8a. Therefore, the fluid flows through the minute gaps between the balls 9. Here, since only the minute gaps g as shown in FIG. 4 exist between the balls 9, the dust or solid matter M in the fluid does not pass through the minute gaps g, and the balls 9 as shown in FIG. The flow is blocked by 9 and the fluid is well filtered. In particular, when the fluid contains an elongated object M such as hair or fibers, the elongated object M is also blocked by the ball 9 as in the above case.

During backwashing, the normally open on-off valves 34 and 35 shown in FIG. 3 are closed, and the normally closed on-off valves 36 and 37 are opened, so that the fluid flows in the opposite direction shown by the black arrow. It will be The backflow of the fluid causes the fluid to pass through the mesh bodies 8 in the strainers S1 and S2, whereby the dust and solid matter M attached to the balls 9 in the container 1 are flown upward. At this time, since the ball 9 floats in the container 1, the hair M entangled in the ball 9 is easily separated from the ball 9 and discharged as shown in FIG.

Further, at the time of this reverse flow, a part of the fluid passes through the bypass pipe 10 and is discharged into the container 1 on the downstream side of the ball 9 to generate the swirling flow P in the container 1, so that the dust is removed. M is more easily discharged, and the swirling flow P makes it possible for the balls 9 to rub each other for self-cleaning. If there is a risk that the balls 9 will flow out during backwashing, the flow rate through the bypass pipe 10 may be adjusted by the throttling mechanism 11 or the like.

By the way, although the balls 9 having the same specific gravity are used in the above-mentioned embodiment, a plurality of types of balls having different specific gravities, for example, two types of balls 9A and 9B as shown in FIG. The cross-sectional area may be reduced to ensure the filtering function.

Further, as shown in FIG. 8, an inverted funnel-shaped portion 81 is formed on the upper end side of the container 1, and a ball separating plate 82 inclined at a constant angle with respect to the fluid flow direction is formed in the container 1. In addition to being provided, it is possible to reliably prevent the loose balls 9 from flowing out at the time of backwashing by the ball separating plate 82, and even if the bypass pipe 10 is not provided, the vortex flow generated at the downstream side of the ball separating plate 82 at the time of backwashing can be used. The balls 9 can be mutually self-cleaning.

Further, as shown in FIG. 9, if the container 1 having the cylindrical portion 91 whose cross-sectional area increases toward the downstream side during backwashing, the downstream side during backwashing Therefore, the flow velocity is reduced, and the outflow of the balls 9 is prevented more reliably.

Furthermore, as shown in FIG. 10, a small-diameter cylindrical portion 6 on the upper end side is provided in the cylindrical portion 2 of the container 1 so as to be displaced in the radial direction to form a U-shaped channel 100, By using the ball separating plate 82 in combination, it is possible to reliably prevent the balls 9 from flowing out during backwashing.

As a matter of course, as a structure for preventing the outflow of the balls 9 at the time of the above-mentioned backwash, as shown in FIG. 11, even if the axial length L of the container 1 is increased, the effect can be exhibited. In this case, the structure can be simplified.

FIG. 12 shows another embodiment of the present invention, in which the balls 9 having a specific gravity smaller than 1 are used, and the container 1 is also installed in the opposite direction to the state shown in FIG. . In this case as well, in addition to the same effect as the above-mentioned embodiment, no special measure is required as a measure for preventing the outflow of the balls 9 during backwashing.

[0022]

[Effect of device]

 As described above, according to the present invention, a mesh-shaped or porous partition plate is arranged in a substantially cylindrical container, which is blocked by the partition plate at the time of normal flow of fluid and can move freely when backwashing. Since a number of balls are held in the container, dust in the fluid can be blocked by the balls to exert a predetermined filtering function, and even long hair such as hair can be used. It can be easily removed by loosening of the balls during backwashing, thus maintaining the desired filtering function for a long period of time. Furthermore, by using a substantially cylindrical container, it is possible to connect various piping connections. Is also easy to implement and the applicability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a strainer according to an embodiment of the present invention.

FIG. 2 is a bottom view comparing the size of the balls used in the strainer and the opening of the net in the same embodiment.

FIG. 3 is a configuration diagram showing a usage state of the strainer of the above embodiment.

FIG. 4 is an explanatory diagram of a mutual gap of the balls.

FIG. 5 is an explanatory diagram of a normal operation of the strainer in the same embodiment.

FIG. 6 is an operation explanatory view when the strainer is backwashed in the embodiment.

FIG. 7 is a schematic vertical sectional view showing a modified example of the main part of the strainer of the present invention.

FIG. 8 is a schematic vertical sectional view showing another strainer in which a ball separation plate is provided in the container.

FIG. 9 is a schematic vertical sectional view of a strainer showing a modified example of the container.

FIG. 10 is a schematic vertical sectional view of a strainer showing another modified example of the container.

FIG. 11 is a schematic vertical cross-sectional view of a strainer showing still another modified example of the container.

FIG. 12 is a schematic vertical sectional view of a strainer showing another embodiment of the present invention.

[Explanation of symbols]

 1 Container 5,7 Pipe connection part 8 Partition plate 8a Upstream side face at the time of forward flow 9,9A, 9B Ball

Claims (1)

[Scope of utility model registration request] 1. A net-like or porous partition plate located near the downstream side in the normal flow direction of the fluid in a substantially cylindrical container having pipe connection portions at both ends in the axial direction of the cylindrical container. A strainer which is fixed by intersecting with the axis, and accommodated in the container a large number of balls which are blocked by the partition plate at the time of normal flow of the fluid and which can float when backwashing. .