JPH04119398U - vortex pump strainer stand - Google Patents

Abstract

(57) [Summary] [Purpose] By simply changing the overlapping state of the double strainer in the circumferential direction, it is possible to change the overlapping state between coarse and fine depending on the internal state of the swirl chamber. To provide a strainer stand for a vortex pump. [Structure] An annular inner strainer 1 attached to a pump suction port 2 and an annular outer strainer 3 that fits around the outer periphery of the inner strainer 1 are arranged between the lower surface of the suction cover 11 and the upper surface of the bottom plate 6. The width of the water passage hole can be changed to wide or narrow by sandwiching the strainer and changing the overlapping state of the opening 4a of the inner strainer 1 and the closed hole 5b of the outer strainer 3.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a strainer stand for a centrifugal pump.

0002

[Conventional technology]

In a centrifugal pump, if pump performance is important, the suction cover should be It is desirable to minimize the distance between the surface and the lower edge of the blade plate, and it is also desirable to If you prioritize not clogging the room, remove the top surface of the suction cover and the blades. The distance from the bottom edge of the board must be increased.

0003 Furthermore, the space between the upper surface of the suction cover and the lower edge of the blade plate can be changed in two ways. If a strainer is used, the strainer must also be compatible. Two Therefore, if the distance between the top surface of the suction cover and the lower edge of the blade plate is narrowed, Solids must be separated from the pump suction by a strainer, and If the distance between the top surface of the suction cover and the bottom edge of the blade is increased, the coarse strain It is sufficient to block only extremely large solid objects using the filter.

0004

[Problem that the idea aims to solve]

It has a structure that can change the distance between the upper surface of the suction cover and the lower edge of the blade plate to be wide or narrow. Even if it is, the roughness of the strainer attached to the pump suction port may vary. If it's strange, you won't be able to demonstrate its characteristics.

[0005] The purpose of this invention is to reduce the distance between the upper surface of the suction cover and the lower edge of the blade plate. The distance between the top surface of the suction cover and the lower edge of the blade plate has been increased, focusing on A strainer stand that can be used in two different ways, even when The objective is to provide a

[0006]

[Means to solve the problem] In the strainer stand according to the present invention, the strainer stand surrounds the outer periphery of the pump suction port. and an annular outer strainer that fits around the outer circumference of the inner strainer. Both strainers have an inner strainer opening and an outer strainer. The plugged part of the side strainer faces the plugged part of the inner strainer, and the plugged part of the inner strainer and the outer strainer A double-layered strainer with holes arranged in such a way that the holes in the strainer face each other. - and the inner and outer strainers forming the double structure are connected to the bottom surface of the suction cover and the bottom plate. Secure it with the mounting bolt so that it is sandwiched between the top surface of the

[0007] In this state, the opening of the outer strainer is connected to the plugged part of the inner strainer. It is divided into two parts to form fine water passage holes, and when the centrifugal pump is operated, it is mixed in the wastewater. Large solids that are in Only the more filtered water and minute solids are sucked in through the pump suction, so the vortex It will not clog the flow chamber. Therefore, the upper surface of the suction cover and the lower edge of the blade plate It is possible to cope with the condition inside the vortex chamber configured to have a narrow interval.

[0008] In addition, the strainer stand according to the present invention has an inner strainer and an outer strainer. It is also possible to fix the trainer using a double structure with the openings facing each other. the law of nature, In this case, the opening becomes fully open and a coarse water passage hole is formed. subordinate Therefore, the vortex chamber has a wide gap between the upper surface of the suction cover and the lower edge of the blade plate. This means that it will be possible to respond to the state of the part.

[0009]

【Example】

Embodiments will be explained below with reference to drawings.

0010 1 is an inner strainer made in an annular shape so as to surround the outer periphery of the pump suction port 2; 3 is an outer strainer made in an annular shape to fit around the outer periphery of the inner strainer 1; The inner strainer 1 has holes in the peripheral walls of both strainers 1 and 3. The portion 4a...4a and the plugged portion 5b...5b of the outer strainer 3 face each other, and the inner Blocked portion 4b of side strainer 1 4b and opening portion 5a of outer strainer 3 The holes are arranged in such a manner that the strainers 5a face each other, and both strainers 1 and 3 form a double structure. A structural strainer is formed. 6 is a bottom with mounting holes 12 on the periphery. It is a board.

[0011] 7 is a bottom open type pump casing, 8...8 is the circumference of pump casing 7. A screw hole 9 provided on the lower surface of the side is connected to the motor shaft 1 in the pump casing 7. 0 is a fitted impeller, and 11 is a suction unit facing the lower edge 9e of the blade plate of the impeller 9. The cover has a pump suction port 2 in the center, and the outer edge is the pump casing. 7 to the lower edge of the peripheral wall, and the mounting hole 12 is provided in the mounting portion 13. and bolt insertion holes 14 facing the screw holes 8...8, and one of them. The surface 13a is formed into a convex annular surface that protrudes higher than the other surface 13b. Therefore figure 2, when one side 11a of the suction cover 11 is opposed to the lower edge 9e of the blade plate, In this case, the axial dimension of the swirl chamber S becomes longer, and the suction cover When the other surface 11b of 11 faces the lower edge 9e of the blade plate, the axial dimension of the swirl chamber S The law becomes shorter. Depending on any of these conditions, use tightening bolt 15...15. , the suction cover 11 is removably fixed to the lower edge of the peripheral wall of the pump casing 7. It is.

0012 In the embodiment of FIG. 1, the upper surface of the suction cover 11 and the lower edge 9e of the blade plate The interval between the two is narrow, and the swirl chamber S is easily clogged with solid matter. corresponds to this condition To attach the invented strainer stand to the centrifugal pump, follow the steps shown in Figure 3. Opening part 4a of sea urchin inner strainer 1... 4a is the closed part 5 of outer strainer 3 b..It is divided into two parts by 5b to form a narrow water passage hole 16a. The inner and outer strainers 1 and 3 are connected to the lower surface of the suction cover 11 and the upper surface of the bottom plate 6. It is fixed with the mounting bolts 17 so as to sandwich it. Books in this manner By attaching the devised strainer stand, dirt is removed when the centrifugal pump is operated. Large solids mixed in the water are blocked and passed through the narrow water passage holes 16a...16a. Only the more filtered water and minute solids are sucked in from the pump suction port 12. , clogging of the swirl chamber S with large solid matter can be avoided in advance.

[0013] In addition, the strainer stand and suction cover 11 in the usage example of FIG. , turn the suction cover 11 over and place one side 11a against the lower edge 9e of the blade plate. In the embodiment of FIG. 2 in which the upper surface of the suction cover 11 and the lower edge 9e of the blade plate The distance between the two becomes larger, making it easier for solids to pass through the swirl chamber S. this state For details on how to fasten the invented strainer stand to a centrifugal pump, see the figure below. As shown in 4, the opening 4a of the inner strainer 1 and the opening 4a of the outer strainer 3 The opening 5a...5a matches with the fully opened coarse water passage hole 16b...16b. The lower surface of the suction cover 11 and the upper surface of the bottom plate 6 form an inner and outer strut. The laners 1 and 3 are fixed by mounting bolts 17 so as to sandwich them. child Driving a centrifugal pump by installing a strainer stand in a manner similar to Sometimes only very large solids that cannot pass through the pump suction 2 block the inflow. The remaining small solids pass through the coarse water passage hole 16b along with the water. The vortex chamber S, which is sucked in from the pump suction port 2 and has an increased axial dimension, can be easily It will not pass through and cause blockages.

[0014]

[Effect of the idea]

According to the present invention, the double strainer attached to the suction port of the centrifugal pump overlaps. By simply changing the condition slightly in the circumferential direction, the condition inside the vortex chamber can be adjusted. It is extremely convenient because it can be converted into two types, coarse and fine.

[Brief explanation of drawings]

[Fig. 1] A longitudinal cross-sectional side view of main parts showing an example of use in which the strainer stand of the present invention is installed around the suction port of a centrifugal pump in response to the narrow gap between the upper surface of the suction cover and the lower edge of the blade plate. be.

[Fig. 2] A longitudinal cross-sectional side view of main parts showing an example of use in which the strainer stand of the present invention is installed around the suction port of a centrifugal pump in response to the wide gap between the upper surface of the suction cover and the lower edge of the blade plate. be.

FIG. 3 is a cross-sectional plan view taken along line AA in FIG. 1;

FIG. 4 is a cross-sectional plan view taken along line BB in FIG. 2;

FIG. 5 is a side view of the inner strainer in the strainer stand of the present invention.

FIG. 6 is a side view of the outer strainer in the strainer stand of the present invention.

FIG. 7 is a longitudinal sectional side view of the bottom plate of the strainer stand of the present invention.

[Explanation of symbols]

1 Inner strainer 2 Pump suction port 3 Outside strainer 4a Opening part of inner strainer 4b Blocked part of inner strainer 5a Outer strainer opening 5b Blocked part of outer strainer 6 Bottom plate 11 Suction cover 17 Mounting bolt

Claims (1)

[Scope of utility model registration request] It has an annular inner strainer (1) surrounding the outer periphery of the pump suction port (2), and an annular outer strainer (3) that fits around the outer periphery of the inner strainer (1), and both of these strainers (1, 3), the opening (4a) of the inner strainer (1) and the plugged part (5b) of the outer strainer (3) face each other, and the inner strainer (1)
The holes are arranged in such a manner that the plugged part (4b) of the outer strainer (3) faces the opening part (5a) of the outer strainer (3) to form a double-structured strainer. , 3) between the lower surface of the suction cover (11) and the upper surface of the bottom plate (6).
A strainer stand for a centrifugal pump, characterized by being fixed by.