JP2018109389A - Strainer device for submerged pump suction inlet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strainer device for a submerged pump suction inlet capable of simply retrofitting the existing submerged pump while being removable debris adsorbed on the water pores of the strainer.SOLUTION: A strainer device 1a comprises: an umbrella member 2 mounted on a casing 51 via a first fixture 4; a strainer 3 with a top edge 3a attached at the edge 2a of the umbrella member 2; and a debris removal member 10 mounted on the circumference of the casing 51 via a second fixture 9. The strainer 3 includes: a passing water part 5 provided near the top edge 3a; and a non-passing water part 6 provided between a bottom edge 3b and the passing water part 5. The debris removal member 10 includes: a center frame 11 fitted into the second fixture 9; a lateral frame 12 provided along from the center frame 11 to the edge 2a; a blade 13 installed upright on the top surface of the lateral frame 12; a vertical frame 14 disposed downward from the lateral frame 12; and a brush 15 supported by the vertical frame 14 in which bristle tips of the brush come in contact with the circumference of the passing water part 5.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a strainer device that prevents foreign matter from entering a submersible pump suction port, and more particularly, to a strainer device for a submersible pump suction port that can be easily retrofitted without changing the structure of an existing submersible pump.

Conventionally, the suction port of the submersible pump installed in the river is clogged with foreign matter and the pump capacity decreases, so for example, a strainer with a water passage and a stirring blade are installed around the suction port to allow the foreign matter to flow. Technologies have been developed that make it difficult to adsorb in the pores.
However, when a large amount of foreign matter exists in water, it is difficult to completely prevent the foreign matter from adsorbing to the water passage hole. Further, when the foreign matter has flexibility such as falling leaves, the foreign matter adsorbed on the water passage hole is likely to be deformed or broken, and thus the foreign matter often passes through the water passage hole. Therefore, even with the above-described technique, the problem of preventing the pump capacity from being lowered cannot be sufficiently solved.
Therefore, prior arts for removing foreign substances adsorbed on the strainer have been developed, and some inventions have already been disclosed.

Patent Document 1 discloses an invention relating to a strainer for a pump suction pipe, which is capable of dispersing dust approaching the strainer under the name of “strainer for a pump suction pipe”.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention disclosed in Patent Document 1 includes a strainer that is rotatably connected to a pump suction port. The strainer is formed with an inclined surface that rotates the strainer in the vicinity of the water flow hole and approaches the inflow hole. It is characterized by including a protrusion for separating dust.
According to the strainer for the pump suction pipe having such a feature, when the pump is operated, the component of the velocity energy of the water flowing from the inflow hole of the strainer rotates the strainer, so that the foreign matter can be separated from the strainer. Moreover, when a soft and long foreign substance like an algae is entangled with a blade disposed below the strainer, high-pressure water can be ejected from the suction pipe to cause the foreign substance to flow away.

Next, Patent Document 2 discloses an invention related to a self-straining strainer for preventing clogging of the strainer under the name “self-cleaning strainer”.
Hereinafter, the invention disclosed in Patent Document 2 will be described. The invention disclosed in Patent Document 2 includes a cylindrical screen that is attached to the lower end of the suction pipe and is connected to a water turbine that can be rotated by the water pressure in the suction pipe, and a scraper that is attached to the suction pipe and meshes with the screen. It is characterized by that.
According to the self-cleaning strainer having such a feature, the water turbine is rotated by the water flow pressure, so that the cylindrical screen can be rotated without using a power source. In addition, since the scraper does not rotate but rotates relative to the screen, it is possible to scrape off foreign substances adhering to the outer peripheral surface of the screen.

Japanese Patent Publication No. 37-8871 JP-A-55-88815

  However, in the invention disclosed in Patent Document 1, the strainer is attached to the vertical axis that is continuously suspended from the center of the radial arm that is installed at the lower end of the outer casing. When it is attached to the pump, it is necessary to change the structure of the submersible pump suction port, and it may take time and money to modify or replace the existing submersible pump. Therefore, the invention disclosed in Patent Document 1 is unsuitable for retrofitting to an existing submersible pump.

  In the invention disclosed in Patent Document 2, since the screen is a birdcage formed by arranging donut-shaped disks at a constant pitch, when the screen is installed near the riverbed, it is swollen by the water flow. It is considered that fine foreign matter easily passes through the screen.

  The present invention has been made in response to such a conventional situation, and can remove foreign matter adsorbed on the strainer's water passage hole, and fine foreign matter can be removed even when installed near the riverbed. It is an object of the present invention to provide a strainer device for a submersible pump suction port that can be prevented from passing through and can be easily retrofitted without changing the structure of an existing submersible pump.

In order to achieve the above object, a first invention includes a casing in which a motor is built and a suction port that opens to a lower end surface of the casing, and the suction port is attached to a submersible pump installed near the bottom of the water. An apparatus comprising: an umbrella-shaped umbrella member that is attached to a periphery of a casing via a first fixture; and a cylindrical strainer having an upper end attached to an outer edge of the umbrella member. A water passage is provided, and a non-water passage is provided between the lower end and the water passage.
In the invention having such a configuration, since the umbrella member is disposed above the strainer, the foreign matter that has dropped from directly above the strainer falls to a position slightly away from the strainer. In addition, the umbrella member may have a polygonal shape in addition to the circular shape when viewed from above.
Further, since the strainer is provided with a water passage near the upper end, water passes through the water passage and is supplied to the suction port. Furthermore, since the non-water-permeable portion is provided between the lower end and the water-permeable portion, the frequency of minute foreign matters that have risen from the bottom of the water due to the water flow to the suction port is reduced.

Next, according to a second aspect, in the first aspect, a foreign matter removing member that is attached to the periphery of the casing via the second fixture is provided above the umbrella member. An annular center frame that is fitted to the outer periphery of the fixture, a horizontal frame that extends from the center frame to the outer edge of the umbrella member, a blade that stands on the upper surface of the horizontal frame, and a lower frame that passes through the frame. A vertical frame that reaches the height of the water portion and is spaced apart from the water flow portion, a brush that is supported by the vertical frame and whose hair tip contacts or approaches the outer periphery of the water flow portion, It is characterized by providing.
In the invention having such a configuration, in addition to the action of the first invention, since the blades are erected on the upper surface of the horizontal frame, when the blades receive the pressure of the water flow, the foreign matter removing member is the central axis of the casing. Rotate around the center. Therefore, the brush rotates in a state where the hair tip contacts or approaches the outer periphery of the water passing portion, and scrapes and removes the foreign matter adsorbed on the water passing portion.
Further, when the blades are rotated, water existing around the foreign matter removing member is stirred and a water flow is generated, so that the foreign matter is also separated by the water flow in a direction away from the strainer. In addition, at least one horizontal frame is provided, and the rotation direction of the foreign matter removing member is not particularly limited.

Furthermore, the third invention is characterized in that, in the second invention, the horizontal frame is provided radially about the central axis of the casing.
In the invention with such a configuration, in addition to the operation of the second invention, the horizontal frame is provided radially around the central axis of the casing, and thus a plurality of blades are also provided radially. Since the plurality of blades arranged in this manner receive the water flow from various directions, the foreign matter removing member continuously rotates around the central axis of the casing as long as the water flow exists.

A fourth invention is characterized in that, in the second or third invention, the circular plate member is provided integrally with the horizontal frame beyond the outer edge of the umbrella member from the center frame.
In the invention having such a configuration, the plate member is provided so as to cover the frame with a certain distance from the umbrella member while supporting the horizontal frame, for example. The “circular shape” includes a “polygonal shape” that can cover the umbrella member.
In the invention of the above configuration, in addition to the action of the second or third invention, foreign matter is prevented from falling into the gap between the umbrella member and the strainer and the plate member.

Finally, a fifth invention is characterized in that, in any one of the first to fourth inventions, the second fixture is a bearing.
In the invention having such a configuration, it is desirable that the bearing used is designed to rotate with a slight force and to easily maintain the rotation.
In the invention of the above configuration, in addition to the action of any one of the first to fourth inventions, the pressure of the water flow received by the blade is immediately converted into the rotational movement of the foreign matter removing member via the bearing.

According to 1st invention, since a foreign material settles a little apart from a strainer by an umbrella member, this can be removed by a water flow, before a foreign material adsorb | sucks to the water flow part of a strainer.
In addition, water can be supplied from the water passage portion to the suction port, and the frequency of minute foreign matter flowing into the suction port by the non-water passage portion is reduced, so that a reduction in pump capacity can be suppressed.

According to the second invention, in addition to the effect of the first invention, the brush removes the foreign matter adsorbed on the water passage portion, so that the strainer can be prevented from being clogged. Furthermore, since the foreign matter is also separated from the strainer by the water flow when the blades are rotated, it is possible to prevent the foreign matter from being adsorbed to the water passage portion. Therefore, a reduction in pump capacity can be further suppressed as compared with the first invention.
In addition, since the foreign substance removing member rotates by the water flow, an electric power source is unnecessary, and the configuration becomes simple and contributes to energy saving.

  According to the third invention, in addition to the effect of the second invention, the foreign matter removing member continuously rotates, so that the foreign matter adsorbed on the water passage portion is efficiently scraped and at the same time the water passage portion. It can suppress that a foreign material adjoins.

  According to the fourth invention, in addition to the effects of the second or third invention, foreign matter is prevented from falling into the gap between the umbrella member and the strainer and the plate member. Can be prevented.

  According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, the pressure of the water flow received by the blade is immediately converted into the rotational movement of the foreign matter removing member via the bearing. Thus, the foreign matter removing member can be continuously rotated while responding to changes in the direction of the water flow. Therefore, scraping of foreign matters in the water passage portion is also performed continuously.

It is a side view of the strainer apparatus of the submersible pump suction port concerning Example 1. FIG. (A) And (b) is a side view of the umbrella member and strainer which comprise the strainer apparatus of the submersible pump inlet which concerns on Example 1, respectively. (A) And (b) is a side view of the umbrella member and strainer which comprise the strainer apparatus of the submersible pump inlet which concerns on the modification of Example 1, respectively. It is a side view of the strainer apparatus of the submersible pump suction port which concerns on Example 2. FIG. It is a top view of the foreign material removal member which comprises the strainer apparatus of the submersible pump suction port which concerns on Example 2. FIG. It is an assembly figure at the time of attaching the strainer apparatus of the submersible pump inlet which concerns on Example 2 to the existing submersible pump. It is a side view for demonstrating an effect | action of the strainer apparatus of the submersible pump suction port which concerns on Example 2. FIG. It is a top view of the foreign material removal member which comprises the strainer apparatus of the submersible pump inlet port which concerns on the modification of Example 2. FIG. It is a side view for demonstrating an effect | action of the strainer apparatus of the submersible pump suction port which concerns on the modification of Example 2. FIG.

The strainer device for the submersible pump suction port of Example 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. 1 is a side view of a strainer device for a submersible pump suction port according to a first embodiment.
As shown in FIG. 1, a strainer device 1 for a submersible pump suction port (hereinafter referred to as a strainer device 1) according to this embodiment includes a motor 51 (not shown) and a casing 51 having a circular cross section. A suction port 52 that opens to the lower end surface of the casing 51 is provided, and the suction port 52 is attached to a submersible pump 50 installed near the bottom B.
An impeller (not shown) that rotates by driving of a motor is provided inside the casing 51 and above the suction port 52. A substantially cylindrical strainer 53 is already provided around the suction port 52. Therefore, when the motor operates, the water drawn through the strainer 53 and sucked from the suction port 52 through the rotation of the impeller passes between the casing 51 and the motor and reaches the water suction pipe 54.

The strainer device 1 includes an umbrella-shaped umbrella member 2 attached to the periphery of a casing 51 via a first fixture 4, and a cylindrical strainer 3 having an upper end 3 a attached to the outer edge 2 a of the umbrella member 2. .
Among these, the umbrella member 2 includes an opening end 2b having an inner diameter equivalent to the outer diameter of the casing 51, and an inclined surface 2c inclined downward toward the outer edge 2a with the opening end 2b as a center. The first fixture 4 is wound around the opening end 2 b and the inner periphery of the opening end 2 b is crimped around the casing 51, whereby the umbrella member 2 and the strainer 3 are fixed to the casing 51. Therefore, the upper end 3 a of the strainer 3 is closed by the umbrella member 2 and the casing 51. The absolute value of the inclination angle θ with respect to the horizontal direction H of the inclined surface 2c is about 20 degrees. Further, as the material of the umbrella member 2 and the strainer 3, stainless steel or plastic is selected in order to prevent the generation of rust.
Moreover, as the 1st fixture 4, the thing which can connect the both ends of a strip | belt-shaped metal plate with the thumbscrew 4a and the nut 4b is used, for example. Therefore, the umbrella member 2 and the strainer 3 are fitted into the casing 51 from above the casing 51 from which the water absorption pipe 54 has been removed, and the first attachment 4 is wound around the outer periphery of the open end 2b, and then the thumbscrew 4a and the nut 4b are attached. By tightening, the strainer device 1 is fixed to the casing 51. At this time, it is desirable that the strainer device 1 is arranged so that the lower end 3b of the strainer 3 does not have a gap with the bottom B.

Next, the strainer which comprises the strainer apparatus of the submersible pump inlet which concerns on this invention is demonstrated in detail using FIG. FIG. 2A and FIG. 2B are side views of the umbrella member and the strainer that constitute the strainer device for the submersible pump suction port according to the first embodiment. In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
As shown in FIG. 2A and FIG. 2B, the strainer 3 is provided with a water passage portion 5 near the upper end 3a, and a non-water passage portion 6 is provided between the lower end 3b and the water passage portion 5. Provided. The water flow part 5 has a plurality of slits 5a arranged in a row in the horizontal direction. Moreover, although the ratio of the length of the water flow part 5 and the non-water flow part 6 in a vertical direction is about 1: 1, it is not limited to this ratio.
In such a strainer 3, as shown in FIG. 2 (b), the foreign matter X falling from above the umbrella member 2 rides on the water flow W flowing along the inclined surface 2 c of the umbrella member 2, and the strainer 3 It is transported to a place slightly away from. In addition, although the fallen leaves are assumed as the foreign material X in the figure, for example, the type is not particularly limited as long as it is a lightweight one that can float in water.

In the strainer device 1 configured as described above, since the upper end 3a of the strainer 3 is closed by the umbrella member 2 and the casing 51 (see FIG. 1), the foreign matter X is prevented from falling into the strainer 3.
Further, the foreign matter X that has fallen from above the umbrella member 2 by the inclined surface 2 c of the umbrella member 2 falls to a position slightly away from the strainer 3, so that the foreign matter X is not easily caught in the water flow sucked into the suction port 52. Thus, the frequency of adsorbing to the water flow portion 5 decreases.
Further, in the strainer 3, the water passage 5 is provided near the upper end 3 a, so that water passes through the water passage 5 and the strainer 53 and is supplied to the suction port 52. At the same time, since the strainer 3 is provided with the non-water-permeable portion 6, for example, in the river, fallen leaves, fine earth and sand, etc. that have risen from the bottom B (see FIG. 1) due to the water flow, respectively. The frequency of adsorbing or flowing into the suction port 52 decreases. This effect is particularly effective when the lower end 3b of the strainer 3 is installed in contact with the water bottom B.
Further, when the lower end 3b of the strainer 3 is installed in contact with the water bottom B, the foreign matter X is prevented from flowing into the suction port 52 through the lower end 3b.

According to the strainer device 1 according to the present embodiment, the umbrella member 2 prevents the foreign matter X from falling into the strainer 3, so the foreign matter X passes through the strainer 53 and is sucked into the suction port 52. The frequency can be reduced. Furthermore, since the foreign matter X settles slightly apart from the strainer 3 by the umbrella member 2, it can be removed by the water flow W before the foreign matter X is adsorbed to the water passage portion 5 of the strainer 3.
In addition, according to the strainer device 1, water can be supplied from the water passage portion 5 of the strainer 3 to the suction port 52, and the frequency of foreign matter X and the like flowing into the suction port 52 by the non-water passage portion 6 is reduced. It is possible to suppress a decrease in pump capacity.

Next, the umbrella member and the strainer which constitute the strainer device for the submersible pump suction port according to the modification of the first embodiment will be described with reference to FIG. FIG. 3A and FIG. 3B are side views of the umbrella member and the strainer that constitute the strainer device for the submersible pump suction port according to the modification of the first embodiment. 1 and 2 are denoted by the same reference numerals in FIG. 3 and description thereof is omitted.
As shown in FIG. 3A, the strainer device for the submersible pump suction port according to the modification of the first embodiment includes an umbrella member 2 ′ and a strainer 7. In the umbrella member 2 ', the absolute value of the inclination angle θ' with respect to the horizontal direction H of the inclined surface 2c 'is 45 degrees, which is approximately twice the inclination angle θ with respect to the horizontal direction H of the inclined surface 2c (see Figs. 1 and 2). It has become. Therefore, compared with the case of the umbrella member 2, the speed of the water flow W is increased in the umbrella member 2 ', so that the foreign matter X falling from above the umbrella member 2' is transferred to a farther place. It will be.
The strainer 7 is obtained by replacing the plurality of slits 5a in the strainer 3 with a plurality of circular holes 8a arranged in a plurality of rows in the horizontal direction. Other configurations, operations, and effects of the strainer device for the submersible pump suction port according to the modification of the first embodiment are the same as those of the strainer device 1.

The submersible pump suction port strainer device of Example 2 according to the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 4 is a side view of the strainer device for the submersible pump suction port according to the second embodiment. The constituent elements shown in FIGS. 1 to 3 are denoted by the same reference numerals in FIG. 4 and the description thereof is omitted.
As shown in FIGS. 4A and 4B, the strainer device 1a for the submersible pump suction port (hereinafter referred to as the strainer device 1a) according to this embodiment is located above the opening end 2b of the umbrella member 2. The foreign matter removing member 10 is provided around the casing 51 via the second fixture 9.
The foreign matter removing member 10 includes an annular central frame 11 that is fitted on the outer periphery of the second fixture 9, and a horizontal frame 12 that is provided so as to be inclined downward from the central frame 11 to the outer edge 2 a of the umbrella member 2. And the blades 13 erected on the upper surface 12a of the horizontal frame 12 so as to be orthogonal to the upper surface 12a, and descend from the outermost end of the horizontal frame 12 to reach the height of the water flow portion 5. A vertical frame 14 disposed at a distance from the water flow portion 5, and a brush 15 supported by the vertical frame 14 and in contact with or approaching the outer periphery of the slit 5 a.

Among these, the horizontal frame 12 is provided radially every 45 degrees around the central axis C of the casing 51. However, this figure shows only the horizontal frame 12, the blade 13, the vertical frame 14, and the brush 15 that are provided symmetrically with a center axis C as the center when viewed from the side in a certain direction, and the rest. The horizontal frame 12 and the like are not shown. The same applies to FIGS. 7 and 9 described later.
Next, the blade 13 increases as the length along the vertical direction V increases from the casing 51. The second fixture 9 is a bearing, and an inner ring thereof is fitted into the casing 51, and an outer ring is fixed to the center frame 11.

Next, the foreign matter removing member constituting the strainer device of the submersible pump inlet will be described in detail with reference to FIG. FIG. 5 is a plan view of the foreign matter removing member constituting the strainer device for the submersible pump suction port according to the second embodiment. 1 to 4 are denoted by the same reference numerals in FIG. 5 and description thereof is omitted.
As shown in FIG. 5, the horizontal frame 12 constituting the foreign substance removing member 10 has a proximal end portion 12b and a distal end that bends at an angle of about 140 degrees with respect to the proximal end portion 12b when viewed from above. It is comprised from the part 12c. In the plurality of horizontal frames 12, the respective base end portions 12 b are provided radially every 45 degrees around the central axis C.
Other configurations of the strainer device 1a are the same as the configuration of the strainer device 1 of the first embodiment.

In the strainer device 1a configured as described above, when the water flow W flows in the clockwise direction (CW in the figure) around the central axis C, the water flow W collides with one surface of the horizontal frame 12, and the horizontal frame 12, blade 13 and the vertical frame 14 rotate integrally in the clockwise direction. Therefore, the water around the blades 13 is pushed by the blades 13 to generate a water flow W ₁ , whereby the foreign matter X existing in the vicinity of the slit 5 a is moved away from the strainer 3. Further, the brush 15 supported by the vertical frame 14 also rotates in a state where the hair tip 15a is in contact with the outer periphery of the slit 5a, so that the foreign matter X adhering to the slit 5a is scraped off and removed by the brush 15. The removed foreign matter X moves further away from the strainer 3 by the water flow W.

Although illustration is omitted, conversely, even when the water flow W flows counterclockwise about the central axis C of the casing 51, the water flow W collides with the other surface of the horizontal frame 12. The frame 12, the blade 13, the vertical frame 14, and the brush 15 are integrally rotated in the counterclockwise direction. Therefore, in the same manner as described above, the foreign matter X or the like existing in the vicinity of the slit 5 a is carried away in a direction away from the strainer 3.
However, when the strainer device 1a is installed in, for example, a river and the direction of the water flow W is limited to one direction as in the case of flowing from upstream to downstream, the horizontal frame 12 is more easily rotated. It is desirable to arrange this for the water stream W.

Then, the attachment method of the strainer apparatus which concerns on Example 2 is demonstrated in detail, using FIG. FIG. 6 is an assembly diagram in a case where the strainer device for the submersible pump suction port according to the second embodiment is attached to an existing submersible pump. The components shown in FIGS. 1 to 5 are denoted by the same reference numerals in FIG. 6 and the description thereof is omitted.
As shown in FIG. 6, when the strainer device 1 a is attached to the casing 51 of an existing submersible pump, the water absorption pipe 54 (see FIG. 1) is previously removed from the casing 51.
Next, the casing 51 is fitted into the opening end 2b of the umbrella member 2 from above the casing 51, and the umbrella member 2 and the strainer 3 are connected to the casing 51 using the first fixture 4 as described above. Fix to.
Subsequently, the second fixture 9 fixed to the foreign matter removing member 10 is fitted into the casing 51 and fixed above the first fixture 4.

And the effect | action of the strainer apparatus concerning Example 2 is demonstrated in detail using FIG. FIG. 7 is a side view for explaining the operation of the strainer device for the submersible pump suction port according to the second embodiment. The components shown in FIGS. 1 to 6 are denoted by the same reference numerals in FIG. 7 and the description thereof is omitted.
As shown in FIG. 7, in the strainer device 1a, when the water flow W flows from the left to the right in the drawing, the foreign matter removing member 10 rotates in the CW direction as described in FIG. Therefore, water W ₁ is generated ambient water blade 13 is pushed by the blades 13, the gap between the lateral frame 12 and the lateral frame 12 is a portion of the water flow W ₁ adjacent the water flow W ₂ passes through the slit 5a And flows into the strainer 3.
This water flow W ₂ is not derived from the water flow W ₁ but merges with the water that has passed through the slit 5 a to form the water flow W _3, and then is sucked into the suction port 52, passes through the inside of the casing 51, and enters the water suction pipe 54. Sent.

In the strainer device 1a, the foreign matter X present above the foreign matter removing member 10 is moved little water W, the W _1, but away from the strainer 3, a portion of the foreign substance X is the water flow W ₂ of the slit 5a Go around, it is attracted to the water flow W ₃ being sucked into the suction port 52 which may be adsorbed to the slit 5a. That is, as compared with the case where the water flow W ₂ is not generated, there are cases where the amount of the foreign matter X adsorbed on the slit 5a is increased. However, even in this case, the foreign matter X adsorbed to the slit 5 a is removed by the brush 15, so that the foreign matter X is prevented from being sucked into the suction port 52.
The operation of the strainer device 1a other than the above is the same as that of the strainer device 1 of the first embodiment.

As described above, according to the strainer device 1a, the foreign matter X present in the vicinity of the slit 5a is separated from the strainer 3 by the rotation of the blades 13, so that the frequency with which the foreign matter X adheres to the slit 5a can be reduced. it can. In particular, since the height of the blade 13 increases as the distance from the casing 51 increases, the pressure of the water flow W is applied to the blade 13 exclusively at a position away from the casing 51. Therefore, the foreign matter removing member 10 has a structure that allows the horizontal frame 12 to be easily rotated.
However, according to the strainer apparatus 1a, in order to water flow W ₂ which passes through the gap of the transverse frame 12 and the lateral frame 12 adjacent occurs, the utilization efficiency of the pressure by the water flow W ₁ is also considered not good. However, this is, conversely, it means that the resistance of the water flow W ₁ applied to the blade 13 is lowered slightly, the lateral frame 12 is capable of exhibiting an excellent effect that tends to rotate. Further, as described above, even when the amount of the foreign matter X adhering to the slit 5a due to the water flow W ₂ is increased, it is possible to remove foreign matter X by the brush 15, if according to the water flow W ₁ Even if the pressure utilization efficiency is not good, this disadvantage can be sufficiently compensated.

Thus, according to the strainer device 1a, the clogging of the slit 5a can be reliably prevented while the configuration is simple because an electric drive source is unnecessary. Therefore, compared with the strainer apparatus 1 which concerns on Example 1, the fall of pump capacity can be suppressed further.
Further, since the horizontal frame 12 can be rotated in either the clockwise direction or the counterclockwise direction around the central axis C, the clogging described above corresponds to a change in the direction in which the water flow W flows. The prevention effect can be exhibited at all times.
Furthermore, as shown in FIG. 6, the strainer device 1a can be easily retrofitted without changing the structure of the existing submersible pump. Therefore, it is not necessary to remove or modify the existing submersible pump, and the burden on the work and costs is minimal, and it is not necessary to change the contents of notification under the River Law.
The effects of the strainer device 1a other than those described above are the same as those of the strainer device 1 of the first embodiment.

And the foreign material removal member which comprises the strainer apparatus of the submersible pump inlet port which concerns on the modification of Example 2 is demonstrated in detail, using FIG. FIG. 8 is a plan view of the foreign matter removing member constituting the strainer device for the submersible pump suction port according to the modification of the second embodiment. The components shown in FIGS. 1 and 7 are denoted by the same reference numerals in FIG. 8 and description thereof is omitted.
As shown in FIG. 8, the foreign matter removing member 16 constituting the strainer of the submersible pump suction port according to the modification of the present embodiment has a circular plate member 17 extending from the center frame 11 to the outer edge 2 a of the umbrella member 2. Thus, it is provided integrally with the plurality of horizontal frames 12 up to the vertical frame 14.
The plate member 17 is an umbrella-shaped member that is provided so as to cover the umbrella member 2 at a predetermined interval, and closes all the gaps between the adjacent horizontal frames 12.

The effect | action of the strainer apparatus which concerns on the modification of Example 2 is demonstrated in detail using FIG. FIG. 9 is a side view for explaining the operation of the strainer device for the submersible pump suction port according to the modification of the second embodiment. 1 to 8 are denoted by the same reference numerals in FIG. 9 and description thereof is omitted.
As shown in FIG. 9, even in a strainer device 1b (hereinafter referred to as a strainer device 1b) of a submersible pump suction port according to a modification of the present embodiment, when the water flow W flows from the left to the right in the figure, the blade 13 surrounding water is pushed by the blades 13 water W ₁ to occur. However, since the plate member 17 closes all the gaps between the adjacent horizontal frames 12 and 12, the water flow W ₂ (see FIG. 7) generated in the foreign material removing member 10 according to the second embodiment is a foreign material. It does not occur in the removal member 16. Therefore, only the water that has not been derived from the water flow W ₁ but has passed through the slit 5 a becomes the water flow W ₃ , and is sucked into the suction port 52 and sent to the water suction pipe 54.
In addition, the foreign matter X is moved by the water flows W and W ₁ , and is separated from the strainer 3 and is also sucked by the water flow W ₃ sucked into the suction port 52 and adsorbed to the slit 5 a. However, the foreign matter X adsorbed on the slit 5 a is removed by the brush 15.
The operation of the strainer device 1b other than the above is the same as that of the strainer device 1 of the first embodiment.

As described above, according to the strainer device 1b, different from the strainer apparatus 1a according to the second embodiment, since the water flow W ₂ which passes through the gap of the transverse frame 12 and the lateral frame 12 adjacent does not occur, umbrella member 2 and a strainer 3, and at the same time the foreign matter X in the gap between the plate member 17 is prevented from falling, the utilization efficiency of the pressure by the water flow W ₁ is good. Therefore, it is possible to move more foreign matter X away from the strainer 3 per rotation of the horizontal frame 12.
However, utilization efficiency of the pressure by the water flow W ₁ is good, conversely, the resistance force of the water flow W ₁ applied to the blade 13 is increased than in the strainer device 1a, the horizontal frame 12 is rotated It becomes difficult. However, by increasing the length of the horizontal frame 12 or increasing the height of the blade 13, the pressure utilization efficiency by the water flow W ₁ and the ease of rotation of the horizontal frame 12 are improved simultaneously. be able to.
The effects of the strainer device 1b other than those described above are the same as those of the strainer device 1 of the first embodiment.

In addition, the structure of the strainer apparatus 1, 1a, 1b of the present invention is not limited to that shown in the embodiments. For example, the umbrella member 2 may have a polygonal shape, or may be formed in a mesh shape in which the foreign matter X is difficult to pass. The water flow part 5 of the strainer 3 may also be formed in a mesh shape. Further, only one horizontal frame 12 may be provided, and in the case of a plurality of horizontal frames 12, the horizontal frame 12 may be provided radially at an angle other than 45 degrees around the central axis C of the casing 51.
Further, the bristles 15 a of the brush 15 may be in a state of being slightly separated from the outer periphery of the water flow portion 5 and approaching the outer periphery of the water flow portion 5 in addition to being in a state of being in contact with the outer periphery of the water flow portion 5. The plate member 17 of the foreign matter removing member 16 may also have a polygonal shape, and may be formed in a mesh shape in which the foreign matter X is difficult to pass. Furthermore, the thickness of the plate member 17 is not limited as long as all the gaps between the adjacent horizontal frames 12 and the horizontal frame 12 are closed. In addition, the strainer devices 1, 1a and 1b may be attached not only to the existing submersible pump but also to a newly installed submersible pump.

  The present invention is applicable as a strainer device for a submersible pump suction port attached to an existing or newly installed submersible pump.

  DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Strainer apparatus 2, 2 '... Umbrella member 2a ... Outer edge 2b ... Open end 2c, 2c' ... Inclined surface 3 ... Strainer 3a ... Upper end 3b ... Lower end 4 ... First attachment 4a ... Thumb screw 4b ... Nut 5 ... Water-permeable part 5a ... Slit 6 ... Non-water-permeable part 7 ... Strainer 8a ... Round hole 9 ... Second fitting 10 ... Foreign substance removing member 11 ... Center frame 12 ... Horizontal frame 12a ... Top surface 12b Part 12c ... Terminal part 13 ... Blade 14 ... Vertical frame 15 ... Brush 15a ... Bristles 16 ... Foreign matter removing member 17 ... Plate member 50 ... Submersible pump 51 ... Casing 52 ... Suction port 53 ... Strainer 54 ... Water absorption pipe

Claims (5)

A strainer device that includes a casing in which the motor is built in, and a suction port that opens at a lower end surface of the casing, and the suction port is attached to a submersible pump installed near the bottom of the water,
An umbrella-shaped umbrella member attached to the periphery of the casing via a first fixture;
A cylindrical strainer having an upper end attached to the outer edge of the umbrella member;
The strainer is a strainer device for a submersible pump suction port, wherein a water passage portion is provided near the upper end, and a non-water passage portion is provided between the lower end and the water passage portion. Above the umbrella member, provided with a foreign matter removing member attached to the periphery of the casing via a second fixture,
The foreign matter removing member includes an annular center frame that is fitted to the outer periphery of the second fixture, a horizontal frame that extends from the center frame to the outer edge of the umbrella member, and an upper surface of the horizontal frame. And a vertical frame that is lowered from the horizontal frame and reaches the height of the water flow portion and is spaced from the water flow portion, and the water flow supported by the vertical frame. The strainer device for a submersible pump suction port according to claim 1, further comprising: a brush whose tip contacts or approaches the outer periphery of the portion.   The strainer device for the submersible pump suction port according to claim 2, wherein the horizontal frame is provided radially about the central axis of the casing.   4. The submersible pump suction port according to claim 2, wherein a circular plate member is provided integrally with the lateral frame beyond the outer edge of the umbrella member from the center frame. 5. Strainer device. The strainer device for a submersible pump suction port according to any one of claims 2 to 4, wherein the second fixture is a bearing.

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