JPH04109500U - vortex pump strainer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a strainer that can be converted into two types, coarse and fine, depending on the condition inside the pump swirl chamber, by simply changing the installation direction from front to back. [Structure] A solid matter inflow prevention plate 2 having a large number of water passage pores 3 is installed horizontally near one edge of the annular plate 1, and a solid matter inflow prevention plate 2 has water passage pores 3. By opening a water inlet 4 coarser than 3 on the circumferential side of the annular plate 1, and changing the mounting direction to the front or back depending on the condition inside the pump vortex chamber,
From the water inlet 4 to the pump suction port 9 through the water passage pore 3.
It becomes a strainer consisting of a water passage leading to the
The strainer has a water passageway extending from the coarse water passage port 4 to the pump suction port 9 via the lower surface of the suction cover 8.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a strainer 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 remains constant. If there is, it will not be possible to demonstrate its characteristics. Also, fine and coarse Prepare two types of strainers and use them according to the conditions inside the swirl chamber. It is inconvenient to separate them.

[0005] The purpose of this invention is to provide a single strainer, and only change the way it is installed. The object of the present invention is to provide a strainer that can respond to the conditions inside a swirl chamber.

[0006]

[Means to solve the problem] In the strainer for the centrifugal pump according to the present invention, the strainer is located near one edge of the annular plate. Then, a solid matter inflow prevention plate with a large number of water passage holes is installed horizontally and integrated with the annular plate. In addition, a water passage hole that is coarser than the water passage pores of the solid matter inflow prevention plate is installed on the circumferential side of the annular plate. Open the solid matter inflow prevention plate and fix it with one side facing the bottom surface of the suction cover. By doing so, a water passage is formed from the water inlet to the pump suction port via the water passage pore. Also, the other side of the solids inflow prevention plate should be faced to the bottom of the suction cover to fix the solids. By doing so, the water flow from the water inlet to the pump suction port via the bottom surface of the suction cover is Waterways are now configured.

[0007]

[Effect]

When fixed with one side of the solid matter inflow prevention plate corresponding to the bottom surface of the suction cover When operating a centrifugal pump, large solids mixed in wastewater are Water and minute solids blocked by the material inflow prevention plate and filtered by the water passage pores Since the fluid is sucked in from the pump suction port, it does not clog the vortex chamber. Therefore, the vortex flow is created by narrowing the gap between the upper surface of the suction cover and the lower edge of the blade plate. This makes it possible to respond to the conditions inside the room.

[0008] In addition, the other side of the solid matter inflow prevention plate should be fixed to the bottom of the suction cover. When the centrifugal pump is operated, there is a possibility that it cannot pass through the pump suction port Only extremely large solids are prevented from flowing in by the annular plate, and the remaining solids are mixed with water. Both water passes through a coarse water inlet and is sucked in from the pump suction port. Therefore, suction It corresponds to the condition inside the swirl chamber where the distance between the top surface of the cover and the lower edge of the blade plate is wide. You will get it.

[0009]

【Example】

Embodiments will be explained below with reference to drawings.

0010 1 is a metal annular plate, 2 is fixed horizontally close to one edge 1a of the annular plate 1 The metal solid matter inflow prevention plate 3 is arranged on the plate surface of the solid matter inflow prevention plate 2. A large number of water passage pores 4 are water passage holes opened on the circumferential side of the annular plate 1, The water passage pores 3 are formed more coarsely than the water passage pores 3. H1 is a solid matter inflow prevention plate This is a bolt insertion hole drilled in the periphery of 2.

[0011] 5 is a pump casing with an open bottom, and 6 is inside the pump casing 5. The impeller 8 is fitted on the motor shaft 7, and the impeller 8 is a support opposite to the lower edge 6e of the blade plate of the impeller 6. It is a pump casing cover with a suction port 9 in the center and a pump casing at the outer edge. A mounting portion 10 is attached to the lower edge of the peripheral wall of the ring 5, and one surface 10a of the mounting portion 10 is attached to the other surface. It is formed into a convex annular surface that protrudes higher than 10b. Therefore, as shown in Figure 3, When one side 8a of the sion cover 8 is opposed to the lower edge 6e of the blade plate, the swirl chamber 11 is The axial dimension becomes longer, and the other surface 8b of the suction cover 8 is winged as shown in FIG. When facing the lower edge 6e of the root plate, the axial dimension of the swirl chamber 11 becomes shorter. these Depending on the condition, use the tightening bolts 12...12 to tighten the suction cover 8. is detachably fixed to the lower edge of the peripheral wall of the pump casing 5.

0012 In the embodiment of FIG. 4, the upper surface of the suction cover 8 and the lower edge 6e of the blade plate are The interval is narrow, and the swirl chamber 11 is likely to be clogged with solid matter. corresponds to this condition When installing a strainer, one side 2a of the solid matter inflow prevention plate 2 is The suction cover 8 is placed opposite to the lower surface of the annular plate 1, and 8. Insert the mounting bolt 13 through the bolt insertion hole H1 while making contact with the periphery of the lower surface of the bolt 8. By fixing it, the water flows from the water passage port 4 through the water passage pore 3...3 to the pump suction port. 9 will be constructed. Therefore, when operating a centrifugal pump, sewage Large solids mixed inside are blocked by the solids inflow prevention plate 2, and the water passage Only the water and minute solids filtered through the holes 3 are sucked from the pump suction port 9. Therefore, clogging of the swirl chamber 11 with large solid matter can be avoided.

[0013] Also, remove the strainer and suction cover 8 in the usage example shown in Figure 4. Figure 3 shows the suction cover 8 turned over so that one side 8a faces the lower edge 6e of the blade plate. In the embodiment, the distance between the upper surface of the suction cover 8 and the lower edge 6e of the blade plate is large. This makes it easy for solid matter to pass through the swirl chamber 11. In response to this condition, When installing the laner, cover the other surface 2b of the solid matter inflow prevention plate 2 with a suction cover. -8, and the other edge 1b of the annular plate 1 is placed opposite the lower surface of the suction cover 8. Insert the mounting bolt 13 through the bolt insertion hole H1 so that it is in contact with the peripheral part and fix it. By doing so, the pump suction port 9 is passed from the water inlet 4 through the bottom surface of the suction cover 8. A waterway will be constructed leading to the area. Therefore, when driving a centrifugal pump, the pump Only extremely large solids that cannot pass through the suction port 9 are blocked from flowing in by the annular plate 1. The remaining solids pass through the coarse water inlet 4 along with the water to the pump suction port 9. It easily passes through the vortex chamber 11 whose axial dimension has been increased to prevent blockages. No damage will occur.

[0014]

[Effect of the idea]

According to the present invention, the installation direction of the strainer attached to the suction port of the centrifugal pump can be changed. By simply changing the front and back sides, you can easily change the condition inside the swirl chamber with a single strainer. It is extremely convenient because it can be converted into two types, coarse and fine, depending on the situation.

[Brief explanation of drawings]

FIG. 1 is a plan view of the strainer of the present invention.

FIG. 2 is a longitudinal sectional side view of the strainer of the present invention.

FIG. 3 is a longitudinal cross-sectional side view of essential parts showing an example of use in which the strainer of the present invention is installed around the suction port of a centrifugal pump in response to a wide gap between the upper surface of the suction cover and the lower edge of the blade plate. .

FIG. 4 is a longitudinal cross-sectional side view of essential parts showing an example of use in which the strainer of the present invention is installed around the suction port of a centrifugal pump in response to a narrow gap between the upper surface of the suction cover and the lower edge of the blade plate. .

[Explanation of symbols]

1 Annular plate 2 Solid matter inflow prevention plate 2a One side of the solid matter inflow prevention plate 2b Other side of solid matter inflow prevention plate 3 Pores for water passage 4 Water outlet 8 Suction cover 9 Pump suction port

Claims (1)

[Scope of utility model registration request] Near one edge of the annular plate (1), a solid matter inflow prevention plate (2) having a large number of water passage holes (3...3) is installed horizontally to connect it to the annular plate (1). A water passage port (4), which is coarser than the water passage pores (3) of the solid matter inflow prevention plate (2), is provided on the circumferential side of the annular plate (1) to prevent the solid matter inflow. Cover one side (2a) of the blocking plate (2) with the suction cover (8).
By fixing them facing each other on the lower surface, a water passage is formed from the water inlet (4) to the pump suction port (9) via the water flow pores (3...3), and also prevents the inflow of solids. By fixing the other surface (2b) of the plate (2) facing the lower surface of the suction cover (8), a passage from the water inlet (4) to the pump suction port (9) via the lower surface of the suction cover (8) is established. A strainer for a centrifugal pump characterized by a water channel.