JP2592893Y2 - Centrifugal pump strainer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strainer for a centrifugal pump. 2. Description of the Related Art In a centrifugal pump, it is desirable to minimize the distance between the upper surface of a suction cover and the lower edge of a vane plate when the performance of the pump is emphasized. If priority is given to the absence of such a gap, the distance between the upper surface of the suction cover and the lower edge of the blade must be increased. In the case where the distance between the upper surface of the suction cover and the lower edge of the blade plate can be changed in a wide and narrow manner,
The strainer must also be compatible. In other words, when the distance between the upper surface of the suction cover and the lower edge of the blade is narrow, solid matter must be cut off from the pump suction port by a fine strainer,
When the distance between the upper surface of the suction cover and the lower edge of the blade is increased, it is sufficient to block only extremely large solids with a coarse strainer. [0004] Even if the structure has a structure in which the distance between the upper surface of the suction cover and the lower edge of the blade plate can be changed in a wide and narrow manner, the roughening of the strainer attached to the pump suction port can be achieved. If the value is constant, the characteristics cannot be exhibited. It is also inconvenient to prepare two types of strainers, a fine one and a coarse one, and use them properly according to the state of the inside of the swirl chamber. An object of the present invention is to provide a single strainer which can respond to the state of the inside of the swirl chamber only by changing its mounting mode. [0006] In the strainer of the centrifugal pump according to the present invention, a large number of pores for water passage are provided near one edge of an annular plate having a coarse water passage opening on the peripheral side. The solid material inflow prevention body provided with a hole is horizontally arranged to be integrated with the annular plate, and one surface of the solid material inflow prevention body is fixed to the lower surface of the suction cover so as to be fixed therethrough. forced water passage configuration leading to the pump inlet via, also via the by Ri water passage for pores to fixing to face the other surface of the solid inflow preventing member to the lower surface of the suction cover
A water passage from the water inlet to the pump suction port via the lower surface of the suction cover was configured. When one surface of the solid substance inflow inhibiting member is fixed to the lower surface of the suction cover, large solids mixed in the sewage are prevented from flowing into the solid when the spiral pump is driven. Only water and fine solids, which are blocked by the body and filtered by the water passage pores, are sucked from the pump suction port, so that the swirl chamber is not clogged. Therefore, it is possible to correspond to the state of the inside of the swirl chamber in which the distance between the upper surface of the suction cover and the lower edge of the blade plate is narrow. Further, when the other surface of the solid substance inflow prevention member is fixed to the lower surface of the suction cover, the extremely large size that cannot pass through the pump suction port when the centrifugal pump is driven. Only the solids are prevented from flowing in by the annular plate, and the remaining solids are sucked from the pump inlet through the coarse water inlet together with water. Therefore, it is possible to cope with the state of the inside of the swirl chamber in which the distance between the upper surface of the suction cover and the lower edge of the blade plate is wide. An embodiment will be described below with reference to the drawings. Reference numeral 1 denotes an annular plate made of a synthetic resin, 2 denotes a synthetic resin inflow-inhibiting body fixed laterally in the vicinity of one edge 1a of the annular plate 1, and 3 ‥‥ 3 denotes a solid Object inflow prevention body 2
A large number of water passage pores 4 are provided in the peripheral side of the annular plate 1, and the water passage pores 3 ‥‥ 3
It is formed coarser than that. H1 is a bolt insertion hole formed in the periphery of the solid inflow inhibiting body 2. Reference numeral 5 denotes a pump casing made of a synthetic resin formed in an open bottom type, 6 denotes an impeller fitted to a motor shaft 7 in the pump casing 5, and 8 faces a lower edge 6 e of a blade plate of the impeller 6. A suction cover made of synthetic resin having a suction port 9 formed at the center, and an outer edge portion serving as a mounting portion 10 to a lower edge of a peripheral wall of the pump casing 5;
One surface 10a of the mounting portion 10 is formed as a convex annular surface protruding higher than the other surface 10b. Therefore, when one surface 8a of the suction cover 8 is opposed to the lower edge 6e of the blade plate as shown in FIG. 7, the axial dimension of the swirl chamber 11 becomes longer, and the other surface 8b of the suction cover 8 as shown in FIG. Is made to face the blade lower edge 6e, the axial dimension of the swirl chamber 11 becomes shorter. In any one of these states, the suction cover 8 is detachably fixed to the lower edge of the peripheral wall of the pump casing 5 by using the tightening bolts 12 # 12. In the embodiment shown in FIG. 6, the distance between the upper surface of the suction cover 8 and the lower edge 6e of the blade plate is small, and the swirl chamber 11 is likely to be clogged with solids. When the strainer is mounted in accordance with this state, the one surface 2a of the solid inflow prevention member 2 is opposed to the lower surface of the suction cover 8, and the one edge 1a of the annular plate 1 is
The mounting bolt 13 is inserted through the bolt insertion hole H1 in a state in which the fixing bolt 13 is brought into contact with the lower surface peripheral portion, and the fixing is performed, so that the water flows from the water inlet 4 to the pump inlet 9 through the water holes 3 細孔 3. A waterway will be constructed. Therefore, when the centrifugal pump is driven, large solids mixed in the sewage are blocked by the solid inflow preventing body 2, and only the water and fine solids filtered through the water passage pores 3 ‥‥ 3 are pumped. Suction port 9
Therefore, it is possible to prevent a large solid matter from being clogged in the swirl chamber 11. Further, in the embodiment shown in FIG. 7 in which the strainer and the suction cover 8 in the use example of FIG. 6 are removed, the suction cover 8 is turned upside down, and one surface 8a faces the lower edge 6e of the blade plate, the upper surface of the suction cover 8 is The distance between the lower edge 6e and the blade plate 6e is increased, so that the solid material easily passes through the swirl chamber 11. When the strainer is mounted in accordance with this state, the other surface 2b of the solid inflow prevention member 2 is opposed to the lower surface of the suction cover 8, and the annular plate 1
The other end 1b of the mounting bolt 13 is attached to the peripheral portion of the lower surface of the suction cover 8 through the bolt insertion hole H1.
Is inserted and fixed, thereby forming a water passage from the water passage 4 to the pump suction port 9 through the lower surface of the suction cover 8. Therefore, when the centrifugal pump is driven, only the very large solids that cannot pass through the pump suction port 9 are prevented from flowing in by the annular plate 1, and the remaining solids together with the water are removed from the coarse water inlet 4. Through the swirl chamber 11 which is drawn through the pump suction port 9 and has an increased axial dimension without clogging. According to the present invention, one strainer can handle the state of the inside of the vortex chamber with a simple operation of changing the mounting direction of the strainer attached to the suction port of the volute pump to the front and back. It is very convenient because it can be converted into coarse and fine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view seen from one side of the strainer of the present invention. FIG. 2 is a plan view of the strainer of the present invention as viewed from the other side. FIG. 3 is an outer side view of the strainer of the present invention. FIG. 4 is a vertical sectional side view taken along line AA of FIG. 1; FIG. 5 is a longitudinal sectional side view taken along line BB of FIG. 1; FIG. 6 is a longitudinal sectional side view of a main part showing an example of use in which the strainer of the present invention is mounted around the suction port of the centrifugal pump in accordance with a state where the distance between the upper surface of the suction cover and the lower edge of the blade plate is small. . FIG. 7 is a vertical sectional side view of a main part showing an example of use in which the strainer of the present invention is mounted around the suction port of the centrifugal pump in accordance with a state in which the distance between the upper surface of the suction cover and the lower edge of the blade plate is wide; . [Description of Signs] 1 Annular plate 2 Solid inflow-inhibiting body 2a One surface of solid inflow-inhibiting body 2b Other surface of solid inflow-inhibiting body 3 Pores for water passage 4 Water passage 8 Suction cover 9 Pump suction port

Claims (1)

(57) [Claims for registration of utility model] Near one end of the annular plate (1) having a coarse water inlet (4) on the circumferential side, a large number of water passage holes (3 mm) are provided.
3) The solid inflow inhibiting body (2) having the perforated body is laterally integrated with the annular plate (1), and one surface (2a) of the solid inflow inhibiting body (2) is connected to the suction cover (8). A water passage from the water inlet (4) to the pump suction port (9) through the water passage hole (3 ‥‥ 3) is formed by being fixed to face the lower surface. (2) The other side (2
I Ri water passage for pores to fixing in opposition to the lower surface of the b) a suction cover (8) (3 ‥‥ 3) going through the
Without passing Mizuguchi (4) water passage leading to the pump inlet through the lower surface of the suction cover (8) (9) from is characterized in that it is configured, strainer centrifugal pumps.