JPH0227857Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a strainer for a pump, especially a submersible motor pump.

``Prior Art'' Conventionally, strainers for submersible motor pumps have been made into a cylindrical shape with multiple rows of vertical grooves or a large number of fine suction holes on the outer periphery, and have been made of cast or sheet metal. It is made separately from the pump body and is attached directly to the pump casing suction port. The suction hole of the strainer gets clogged with foreign matter, but such a strainer spans multiple suction hole members, so soft foreign matter such as fibrous foreign matter that is sucked into the strainer at both ends may be strongly pushed into the strainer suction hole or clogged within the strainer. The fiber ends get tangled and harden, making it extremely difficult to remove. Furthermore, when the submersible pump is stopped, transferred water containing foreign matter may flow back and clog the strainer, making it impossible to start suction.

A strainer is clogged by such backflow water, for example, when fibrous dust clogs the strainer's suction hole, but when the dust gets entangled and is pulled out from the outside through the suction hole, it pushes a bundle of fibers into the suction hole, making it impossible to remove it. Now I have to remove the strainer and clean it one by one.

Strainers disclosed in Japanese Utility Model Application Publication No. 59-170700 and Japanese Utility Model Application Publication No. 59-84299 solve the above problems of pump strainers. The former idea is an improvement on the latter. ``In a pump strainer, foreign matter prevention pieces that are elongated protrusions that extend vertically on the strainer outer peripheral member and are elongated in the inner and outer directions of the strainer are arranged circumferentially in a comb-like manner. and a strainer characterized in that the fluid passages on both sides of the foreign matter blocking piece are connected through the tip side. The former invention of this prior application solves the conventional problems, and the foreign matter blocking pieces are rigid in the internal and external directions and maintain the function of the strainer. A long fluid passage is formed in the circumferential direction of the strainer, allowing a large amount of water to pass through.
Foreign matter is easily removed by backflow water. If a foreign object becomes clogged, the foreign object blocking piece can be manually pushed out in the circumferential direction, making it easy to remove the foreign object without removing the strainer. The foreign matter blocking piece vibrates due to the water flow, which has the effect of returning foreign matter. Since it is elastic as a pump base, it increases the impact resistance of the pump and has other effects.

"The problem that the idea attempts to solve" However, the following problems have been found.

FIG. 14 is a drawing schematically showing the main part of the invention disclosed in this Japanese Utility Model Publication No. 59-170700, which is integrated with the pedestal of the strainer and has a foreign matter blocking piece 2 attached to the outer peripheral member.
9, which entered the bottom of the pump casing 14, which is the upper member of the strainer, and the fluid passages on both sides of the foreign object blocking piece were connected at the tip side, so if dirt 30 stuck to the strainer, the strainer In some cases, the suction hole of the product was blocked. Also, since this foreign matter blocking piece 29 was located inside the strainer bottom plate 26 that was integrated with the pedestal, the outer peripheral upper surface 26a of the strainer bottom plate 26
There were times when garbage accumulated in the tank and water could not be pumped.

This invention inherits the main effects of the pump, especially the strainer of the submersible motor pump, of the earlier application, and also eliminates the above-mentioned drawbacks, and makes it difficult for foreign matter, especially fibrous foreign matter, to get stuck in the handled liquid, and even if the foreign matter gets stuck between the foreign matter blocking pieces. It is an object of the present invention to provide a strainer that can still ensure water flow even when

[Structure of the idea]

"Means for Solving the Problem" This invention has foreign matter blocking pieces that extend vertically on the bottom plate of the strainer and are arranged in the circumferential direction with elongated protrusions extending inward and outward from the strainer, so that the fluid passages on both sides of the foreign matter blocking pieces are arranged in the circumferential direction. In the pump strainer configured to be connected through the vicinity of the tip, the inner end surface of the tip of the foreign matter blocking piece in the inner and outer direction is located away from the side surface of the strainer upper member.

``Function'' Because there is a foreign matter prevention piece on the outside of the side surface of the upper member of the strainer, even if dirt gets entangled in the foreign matter prevention piece, fluid flows diagonally inward or downward between the upper member and the tip of the foreign matter prevention piece. Since the passage is structured, it is difficult for foreign objects to become clogged.

"Example" Hereinafter, an example of this invention will be described with reference to the drawings. FIG. 1 is a partially sectional side view of a submersible motor pump equipped with a strainer of this invention. The motor has a motor cover 2 on the top of the motor frame 1.
is fixed, a handle 3 is fixed to the motor cover 2, an underwater cable 4 is connected to an internal stator via a connector 5, and a main shaft 6 to which a rotor is fixed is supported by a bearing (not shown). In the sealed chamber 7, it protrudes downward from the motor frame 1 via a shaft sealing device 8 such as a mechanical seal.

An intermediate casing 9 is fitted into the motor frame 1 via a seal ring 11, and bolts 12 are inserted into the bolt holes of the intermediate casing 9 and screwed into the motor frame 1, so that the motor frame 1 and the intermediate casing 9 are fixed. .

Gasket packing 13 is installed in the intermediate casing 9.
The strainer 15 is in contact with the lower surface of the pump casing 14, and the strainer is tightened by tightening bolts and nuts 16 that are inserted through the bolt holes of the strainer 15, the bolt holes of the pump casing 14, and the bolt holes of the intermediate casing 9. By pulling the strainer 15 and the intermediate casing 9 together, the pump casing 14 is pressed and held between the strainer 15 and the intermediate casing 9.

In the pump casing 14, the square hole of the impeller 17 fits into the square shaft portion of the end of the main shaft 6, and the impeller 17 is prevented from moving in the axial direction by an impeller nut 18 screwed into the end of the main shaft 6. The front surface of the impeller 17 is open, and there is a space between the front surface of the impeller and the inner bottom surface of the pump casing 14. The front surface 19a of the main plate 19 of the impeller 17 is substantially flush with the upper cover 14b of the pump casing 14.

In the impeller nut 18, a stirring blade 18a having a single letter in a plan view is inserted through the suction port 21 and slightly extends downward. 22 is a discharge port, 23 is a discharge port 2
This is a liquid feed pipe joint attached to 2 with bolts and nuts 24.

The strainer 15 has a bolt stopper 25 integrally molded therein, and the bolt of the bolt nut 16 is inserted through the center hole of the bolt stopper 25.

FIG. 2 is an enlarged plan view of the strainer 15 shown in FIG. 1. Around this bolt stopper 25 are tightening pedestals 27 provided on the strainer bottom plate 26 at three equal intervals on the circumference.
Pedestals 28, 28' for receiving 4 are provided, and foreign matter blocking pieces 29, 29' are arranged in the circumferential direction between each of these pedestals 27, 28, 28' so that fluid passages are formed at equal intervals in the radial direction. These bolt stopper 25, bottom plate 26, each pedestal 27, 28, 2
8' and foreign matter blocking pieces 29, 29' are integrally molded from an elastic material such as rubber or synthetic resin.

3 is a vertical sectional view of the bolt stopper, FIG. 4 is a front view of the right side of FIG. FIG.

The bolt stopper 25 is cut into the center of the end of the cylindrical tube material to form an opposing surface with a width across flats 25a and a seat surface 25b.
has been formed. The bolt shaft of the bolt nut 16 is loosely inserted into the center hole of the bolt stopper 25.
The opposite side portion 16a of the hexagonal head of the bolt has a width across flats of 2
5a, so that the seat of the hexagonal head comes into contact with the seat surface 25b. A groove 25c is formed on the cylindrical outer periphery of the bolt stopper 25 so as to form a width across flat portion, and a molded portion of the pedestal 27 forms a groove 25c.
5c, so that it cannot be turned by the bolt of the bolt/nut 16 and cannot come out of the pedestal 27. Therefore, when attaching the strainer 15 using the bolt nut 16, it can be attached by rotating only the nut, so two tools are not required.

The pedestal 2 is installed vertically on the strainer bottom plate 26.
Numerals 8 and 28' are radially long protrusions whose upper surfaces are flush with the tightening pedestal 27 and which can come into contact with the bottom surface of the pump casing 14, and are located on the outer periphery of the strainer bottom plate 26. The foreign matter blocking pieces 29, 29' extend vertically on the strainer bottom plate 26, are elongated protrusions in the radial direction of the strainer bottom plate 26, and are disposed in the circumferential direction. That is, the foreign matter blocking pieces 29, 2
When the planar shape of the strainer is not circular, 9' can be thought of as a long thin protrusion extending from the inside to the outside of the strainer. The bottom plate 14a of the pump casing 14 also serves as the upper member of the strainer.
The outer periphery of 4a is shown as a circle 14 centered on the main shaft 6.
It is c. When the strainer 15 is provided with an upper member, the upper member is attached with the same diameter as the outer circumference of the bottom plate 14a.

7 is an enlarged sectional view taken along line AA in FIG. 2, and FIG. 8 is an enlarged sectional view taken along line BB in FIG. Foreign object prevention piece 2
Reference numeral 9 denotes an inclined surface 29b in which an inner end surface 29a in the inner and outer direction of the strainer forms a vertical surface, and an outer end surface in the inner and outer direction of the strainer descends toward the outer circumferential side of the strainer.
The lower end of the inclined surface 29b coincides with the outer periphery of the strainer 15, that is, the outer periphery of the strainer bottom plate 26. The top surface 29c is the pump casing 1
It is approximately the same height as the bottom plate 14a of No. 4. Therefore, arrow F
It has a shape that is relatively rigid in response to a force in the direction, but easily deflects in response to a force in the direction of arrow G, as shown in FIG. The deflection characteristics of the foreign matter blocking piece 29 are optimal in such a case, but it is preferable if it has flexibility.

The foreign matter blocking piece 29 is located outside the outer periphery 14c of the bottom plate 14a of the pump casing of the strainer upper member. That is, the distance d is between the outer circumference 14c of the bottom plate of the pump casing in the radial direction and the inner end surface 29a of the foreign object blocking piece in the radial direction.
is far away. This distance d may be provided at the upper part of the inner end surface of the foreign matter blocking piece 29, and the foreign matter blocking piece may have the shape shown in FIGS. 9 and 10.

Although the top surface 29c of the foreign matter blocking piece is not limited as described above, the shortest distance between the bottom plate 14a of the pump casing and the foreign matter blocking piece 29 (=d in this embodiment),
The fluid passage S1 shown in FIG. 2 is determined by the distance between the inner sides in the inner and outer directions of the opposing side surfaces of adjacent foreign object blocking pieces 29, and the distance between the inner sides in the inner and outer directions of the side surfaces of the foreign object blocking pieces 29 and the pedestal 27 or 28. The illustrated fluid passage S defined by the bottom plate 14a of the pump casing
2. The height of S3 is allowed within the range of the size of the foreign matter targeted for filtration. These fluid passages S1, S2, and S3 are connected in the circumferential direction and form part of an arcuate fluid passage.

As shown in FIG. 2, the foreign matter blocking pieces 29 adjacent to each other are oriented in the radial direction and are equally spaced as shown by the fluid passages S4 and S5, so S5>S4. A fluid passage S is provided between the foreign matter blocking piece 29 and the pedestal 28.
7. A fluid passage S6 is provided between the foreign matter blocking piece 29 and the tightening pedestal 27. Fluid passages S1-4, S6, S
The size of 7 is determined in conjunction with the pump configuration in relation to foreign matter contained in the handled liquid.

Among the pedestals 28, the pedestal 2 that is in contact with the bottom plate 14a of the pump casing 14 that constitutes the discharge port 22
8' is not provided with a protrusion 28a into which the bottom plate 14a of the pump casing shown in FIG. 11 in the direction of arrow C in FIG. 2 is fitted (FIG. 2). Furthermore, the bottom plate 1 of the pump casing 14 that constitutes the discharge port 22
The foreign object blocking piece 29' below 4a is shown as D-D in Fig. 2.
As shown in FIG. 12, which is a sectional view, the shape is the same as that of the foreign object blocking piece 29 located elsewhere, except that there is a top surface 29c located at a position below the lower surface of the bottom plate 14a of the pump casing by the distance S0 of the fluid passage. However, although the foreign matter blocking pieces 29 have the effect of the present invention, the small number of foreign matter blocking pieces 29' does not have that effect.

When the motor is energized and the main shaft 6 rotates, the impeller 1
7 rotates and passes through the strainer 15 to the suction port 21
Aspirate the liquid through the In the pump chamber, a vortex as shown in FIG. 22 and is discharged. Strainer 15
, a fluid passageway S0, and an arcuate fluid passageway from top to bottom including S1, S2, S3, S4, S6,
Foreign matter in the liquid is blocked by passing through the radial fluid passage of S7. At this time, the foreign object blocking pieces 29, 29' receive a force in the direction of arrow F in FIG.
However, since the foreign matter blocking pieces 29, 29' have the same effect as a rigid body, the fluid passages S0, S1, S2, S
It functions as a strainer with 3, S4, S6, S7, etc. That is, foreign matter in the liquid is removed by the foreign matter blocking piece 2.
It is blocked at 9,29'.

Dust 30 contained in the liquid is removed by a foreign object prevention piece 29
It accumulates on the outer inclined surface 29b. This foreign object is the first
Even if the fluid path between the inclined surfaces 29b is blocked as shown in the schematic diagram of FIG. There is no possibility that water cannot be pumped due to the structure of the passage. Further, since the outer end surface of the foreign matter blocking piece is an inclined surface 29b that descends outward, and the lower end of the inclined surface coincides with the outer circumferential surface of the strainer 15, that is, the outer circumferential surface of the strainer bottom plate 26, the inclined surface 29b
The garbage can easily slide off the strainer bottom plate 2.
No debris will accumulate on the 6. Also, when the pump is pulled up, the backflow of water automatically causes the garbage to slide down, allowing for garbage removal.

When the pump stops, backflow water enters the pump chamber from the liquid feed pipe (not shown) following the liquid feed pipe joint 23 with a water head larger than the normal suction pressure,
The dirt that enters the strainer 15 from inside the strainer is also pushed back, but at this time the foreign matter blocking piece 29
The fluid passages on both sides (excluding the foreign matter blocking piece 29') are connected at the upper part, and since this upper part allows dirt to escape even when facing upward, it is easy for the dirt to return to the water reservoir during backflow.

[Effect of idea]

In this device, foreign matter blocking pieces that extend vertically on the bottom plate of the strainer and are elongated protrusions in the inside and outside directions of the strainer are arranged in the circumferential direction so that the fluid passages on both sides of the foreign matter blocking pieces are connected through the vicinity of the tip. In the pump casing, the strainer is arranged such that the inner end surface of the tip of the foreign object blocking piece in the outward and outward direction is located away from the side surface of the strainer upper member, so that even if the outer end surface of the foreign object blocking piece becomes clogged with foreign objects such as dirt, This prevents the pump from being unable to pump water due to a gap remaining in the circumferential direction between the inner end surface of the tip of the foreign object blocking piece and the side surface of the strainer upper member.

In this invention, in the above structure, the outer end surface of the foreign matter blocking piece is an inclined surface descending toward the outer periphery of the strainer, and the lower end of the inclined surface coincides with the outer periphery of the strainer bottom plate. The surface area and the fluid passage on the surface are large, and it is difficult for foreign matter such as dirt to accumulate on the outer periphery of the strainer, and the backflow water has the effect of causing foreign matter such as dirt to fall outside the strainer.

In the embodiment, the pump stand and the strainer are integrally molded and the foreign matter blocking piece is erected, but the pump stand and the strainer may be made separately by attaching the strainer to the pump stand that supports the pump so as to fit it into the outer circumference of the pump stand, for example. good.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of an embodiment of this invention, Fig. 2 is an enlarged plan view of the strainer shown in Fig. 1, Fig. 3 is a longitudinal sectional view of the bolt stopper, and Fig. 4 is a side view of the strainer shown in Fig. 3. A front view, FIG. 5 is an assembled vertical sectional view of the bolt stopper, FIG. 6 is a front view of FIG. 5, FIG. 7,
8 is an enlarged sectional view taken along lines AA and BB in FIG. 2, FIGS. 9 and 10 are sectional views at the same position as FIG. 7 of another embodiment of this invention, and FIG. The figure is a view from arrow C in Fig. 2, and Fig. 12 is D-D in Fig. 2.
13 is a longitudinal sectional view showing the effect in the same section as FIG. 7, and FIG. 14 is a longitudinal sectional view in the internal and external direction of the conventional example. 1...Motor frame, 2...Motor cover, 3
... Handle, 4 ... Underwater cable, 5 ... Connector, 6 ... Main shaft, 7 ... Shaft sealing chamber, 8 ... Shaft sealing device, 9 ... Intermediate casing, 11 ... Sealing ring, 1
2...Bolt, 13...Gasket packing, 1
4...Pump casing, 14a...Bottom plate, 14
b... Upper wall, 14c... Outer periphery, 15... Strainer, 16... Tightening bolt nut, 16a... Opposite side portion, 17... Impeller, 18... Impeller nut,
18a... Stirring blade, 19... Main plate, 19a...
Front, 21...Suction port, 22...Discharge port, 23...
...Liquid pipe joint, 24...Bolt nut, 25...
Bolt stopper, 25a... Width across flats, 25b...
Seat surface, 25c...Groove, 26...Strainer bottom plate,
27, 28, 28'...Pedestal, 28a...Protrusion,
29, 29'... Foreign matter blocking piece, 29a... Inner end surface, 29b... Inclined surface, 29c... Top surface, 30...
...Garbage, S0-S7...Fluid passage, F, G...
arrow.

Claims (1)

[Claims for Utility Model Registration] 1. Foreign matter blocking pieces that extend vertically on the bottom plate of the strainer and are elongated protrusions in the inner and outer directions of the strainer are arranged in the circumferential direction, and the fluid passages on both sides of the foreign matter blocking pieces are arranged through the vicinity of the tip. In the pump strainer configured to be connected to each other, the inner end surface of the tip of the foreign matter blocking piece in the inner and outer direction is located away from the side surface of the strainer upper member. 2. The strainer according to claim 1 of the utility model registration claim, wherein the outer end surface of the foreign matter blocking piece is an inclined surface that slopes down toward the outer periphery of the strainer, and the lower end of the inclined surface coincides with the outer periphery of the strainer bottom plate. . 3. The strainer according to claim 1 or 2, wherein the strainer and the pump stand are integrally made of an elastic material.