Submerged pump

Abstract

To provide a submerged pump capable of reducing water remaining inside the submerged pump (strainer) after a submerged pump body stops operating.SOLUTION: A submerged pump 10 comprises a pump body 100, and a strainer 200 arranged so as to cover a suction port 160 of the pump body 100. The strainer 200 has slits 211 and 212 extending from an outer peripheral side surface 210a of the strainer 200 to at least a part of a bottom surface 220b.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a submersible pump. [Background technology]

[0002] Conventionally, submersible pumps have been used at construction sites for purposes such as draining spring water. Submersible pumps use a motor to draw up water that has accumulated in a tank and drain it, but they are equipped with a strainer that covers the suction port of the pump body to prevent foreign matter from clogging the suction port when drawing water.

[0003] For example, Patent Document 1 discloses a submersible pump having an opening in which a plurality of holes of the same diameter are drilled in a predetermined arrangement on the side of a strainer. The arrangement density of the holes in the relatively lower part of the opening is set lower than the arrangement density of the holes in the relatively upper part, thereby preventing clogging of the holes and suppressing the intake of small foreign objects. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-287468 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the submersible pump disclosed in Patent Document 1 does not take into consideration water remaining inside the submersible pump (strainer) after the operation of the submersible pump main body is stopped.

[0006] For example, it is possible to drain the water remaining inside the submersible pump (strainer) by providing a drain hole on the bottom of the strainer, but if the submersible pump is installed on the ground, the hole will become blocked and the water will not be able to drain sufficiently.

[0007] If water remains inside the submersible pump (strainer), for example, cement and sludge that are contained in the water and enter the submersible pump when it is sucked in may harden and adhere, resulting in a reduction in the submersible pump's drainage function.

[0008] Therefore, an object of the present invention is to provide an underwater pump that reduces the amount of water remaining inside the underwater pump (strainer) after the operation of the underwater pump body is stopped. [Means for solving the problem]

[0009] An underwater pump according to one aspect of the present invention comprises a pump body and a strainer arranged to cover the suction port of the pump body, the strainer having an opening extending from the outer side surface of the strainer to at least a portion of the bottom surface.

[0010] In the above aspect, the strainer may have a facing surface that faces the suction port and is inclined so as to approach the suction port from the outer periphery toward the center.

[0011] In the above aspect, the opening may be formed by a plurality of slits.

[0012] In the above aspect, the plurality of slits may be formed on the outer peripheral side surface of the strainer so that their width increases toward the bottom surface.

[0013] In the above aspect, the plurality of slits may be formed on the bottom surface so as to have a predetermined width and extend from the outer periphery toward the center.

[0014] In the above aspect, the plurality of slits may be formed on the bottom surface such that adjacent slits have different lengths.

[0015] In the above aspect, among the multiple slits, the slit formed at a position corresponding to a flow path formed in the pump body to guide water sucked in from the suction port to the discharge port may be smaller than the slits formed at other positions.

[0016] In the above aspect, the opening areas of the plurality of slits formed on the outer peripheral side surface of the strainer may be formed to be inclined in the thickness direction so that the opening areas are larger on the inner peripheral surface than on the outer peripheral surface.

[0017] In the above aspect, the strainer may further include a cutout portion provided between the two slits, the cutout portion being a part of the outer peripheral side surface opposite to the bottom surface. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a submersible pump that reduces the amount of water remaining inside the submersible pump (strainer) after the operation of the submersible pump body is stopped. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing the appearance of a submersible pump 10 according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view showing the internal structure of a submersible pump 10 according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view of a strainer 200 according to a first embodiment of the present invention, as viewed from above. [Figure 4] 1 is a plan view of a strainer 200 according to a first embodiment of the present invention, viewed from below. [Figure 5] FIG. 2 is a perspective view showing a detailed configuration of a casing unit 140 according to the first embodiment of the present invention. [Figure 6] FIG. 10 is a schematic diagram showing the appearance of a submersible pump 11 according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a perspective view of a strainer 201 according to a second embodiment of the present invention, as viewed from above. [Figure 8]FIG. 10 is a perspective view of a strainer 201 according to a second embodiment of the present invention, as viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiment described below is merely a specific example for carrying out the present invention and is not intended to limit the scope of the present invention. Furthermore, to facilitate understanding of the description, the same components in each drawing will be designated by the same reference numerals wherever possible, and duplicate descriptions may be omitted.

[0021] First Embodiment [Submersible pump configuration] FIG. 1 is a schematic diagram showing the exterior of a submersible pump 10 according to a first embodiment of the present invention. Each drawing may show an x-axis, a y-axis, and a z-axis. The x-axis, y-axis, and z-axis form a right-handed, three-dimensional Cartesian coordinate system. Hereinafter, the direction of the x-axis arrow may be referred to as the x-axis + side, and the direction opposite the arrow may be referred to as the x-axis - side, and the same applies to the other axes. The z-axis + side and z-axis - side may also be referred to as the "upper side" and "lower side," respectively. The z-axis direction may also be referred to as the "up-down direction." Planes perpendicular to the x-axis, y-axis, or z-axis, respectively, may also be referred to as the yz plane, zx plane, or xy plane.

[0022] As shown in FIG. 1, the submersible pump 10 includes a pump body 100 and a strainer 200 provided below the pump body 100.

[0023] 2 is a cross-sectional view showing the internal structure of the submersible pump 10 according to the first embodiment of the present invention. As shown in FIG. 2, the pump body 100 includes a rotating shaft 110, a motor 120, an impeller 130, and a casing unit 140.

[0024] The pump body 100 has a generally cylindrical shape. A discharge port 170 and a suction port 160 are provided on the upper and lower sides of the pump body 100, respectively.

[0025] The submersible pump 10 is a vertical submersible electric pump in which the central axis of rotation of the rotating shaft 110 extends in the vertical direction. The rotating shaft 110 has a cylindrical shape that extends in the vertical direction and is rotatably fixed to the pump body 100. An impeller 130 is fixed to the lower end of the rotating shaft 110. A rotor of a motor 120 is fixed to the upper side of the rotating shaft 110. The rotation of the rotating shaft 110 is driven by electromagnetic force between a stator included in the motor 120 and the rotor. The rotating shaft 110 transmits the rotational force generated by the motor 120 to the impeller 130.

[0026] Casing unit 140 is provided below motor 120 and forms pump chamber 150 in which impeller 130 is housed. A suction port 160 is provided below rotating shaft 110 and opens into a wall separating pump chamber 150 from the space below casing unit 140. Water to be drained is introduced into pump chamber 150 from the space below casing unit 140 through suction port 160.

[0027] When the motor 120 is driven to rotate the impeller 130, the water introduced into the pump chamber 150 is given momentum by the impeller 130, moves along the flow path FP, and is discharged from the discharge port 170. As the water introduced into the pump chamber 150 is discharged, new water flows into the pump chamber 150 from the space below the casing unit 140 through the suction port 160. As a result, a continuous flow of water is generated in the pump body 100 along the flow path FP, which is provided to guide the water sucked in from the suction port 160 through the pump chamber 150 to the discharge port 170, and the water is discharged by the submersible pump 10.

[0028] [Strainer configuration] Fig. 3 is a perspective view of the strainer 200 according to the first embodiment of the present invention as seen from above. Fig. 4 is a plan view of the strainer 200 according to the first embodiment of the present invention as seen from below.

[0029] 2 to 4, strainer 200 includes a cylindrical portion 210 and a bottom portion 220. Bottom portion 220 is a disk-shaped member extending along an xy plane intersecting with the z-axis. Bottom portion 220 has an upper opposing surface 220a and a bottom surface 220b opposite opposing surface 220a. The shape of bottom portion 220 is not limited to a disk shape, and may be any plate-like shape.

[0030] The cylindrical portion 210 has a generally cylindrical shape extending in the up-down direction. The shape of the cylindrical portion 210 is not limited to a generally cylindrical shape, and may be any cylindrical shape. The cylindrical portion 210 includes three tall portions 210H and three short portions 210L. The tall portions 210H and the short portions 210L are arranged alternately in the circumferential direction. A smooth outer peripheral side surface 210a is formed over the entire cylindrical portion 210 by the outer peripheral surfaces of the tall portions 210H and the short portions 210L.

[0031] The lower end of the tall portion 210H and the lower end of the short portion 210L are aligned and connected to the outer periphery 220ae of the bottom surface 220b. Meanwhile, the upper end of the tall portion 210H is positioned higher than the upper end of the short portion 210L. By connecting the cylindrical portion 210 and the bottom portion 220, the strainer 200 has a cup shape that is open at the top when viewed as a whole.

[0032] The upper side of the strainer 200 is connected to the lower side of the pump body 100. The submersible pump 10 is placed in the boiler pit so that the bottom surface 220b is in contact with the bottom of the boiler pit, whereby the submersible pump 10 stands independently on the bottom of the water with the strainer 200 and the pump body 100 positioned on the lower and upper sides, respectively.

[0033] The strainer 200 is positioned to cover the suction port 160 of the pump body 100. Specifically, the strainer 200 is connected to the pump body 100 so that the opposing surface 220a faces the suction port 160 of the pump body 100. The strainer 200 and the pump body 100 form the overall shape of the submersible pump 10.

[0034] The strainer 200 has one or more openings extending from the outer peripheral side surface 210a to at least a portion of the bottom surface 220b. In this embodiment, the openings are formed by, for example, a plurality of slits 211 (an example of an "opening") and a plurality of slits 212 (an example of an "opening").

[0035] The plurality of slits 211 are formed in the high back portion 210H, and the plurality of slits 212 are formed in the low back portion 210L.

[0036] When the submersible pump 10 is stopped after the water discharge from the boiler room is completed, or when the submersible pump 10 is stopped and raised from the boiler room before the water discharge from the boiler room is completed, the residual water accumulated in the pump chamber 150 etc. drips by gravity onto the bottom surface 220b through the suction port 160. Because the slits 211 and 212 are configured to extend from the outer peripheral side surface 210a to at least a part of the bottom surface 220b, the residual water that drips onto the bottom surface 220b can be quickly discharged from the slits 211 and 212 to the outside of the submersible pump 10, thereby preventing the residual water from accumulating inside the strainer 200.

[0037] Furthermore, even if the residual water is muddy water or water containing cement, the residual water can be prevented from accumulating inside the strainer 200, thereby preventing the sludge or cement that has entered the inside of the strainer 200 from solidifying and adhering, and ultimately preventing a decline in the drainage function of the submersible pump 10.

[0038] Opposing surface 220a of bottom 220 faces suction port 160 and is inclined so as to approach suction port 160 from outer periphery 220ae toward central portion 220ac (see FIG. 2). In other words, bottom surface 220b is formed to be inclined downward from central portion 220ac toward outer periphery 220ae. In this embodiment, the approximate center of opposing surface 220a is most elevated, and there is a uniform downward slope from the center toward outer periphery 220ae.

[0039] With this configuration, when residual water accumulated in the pump chamber 150 or the like drips down to the bottom surface 220b through the suction port 160 due to gravity, the gradient formed on the bottom surface 220b allows the residual water to move to the outer periphery 220ae and be quickly discharged outside the submersible pump 10 through the slits 211 and 212.

[0040] The plurality of slits 211 and the plurality of slits 212 are formed on the bottom surface 220b so as to have a predetermined width and extend from the outer periphery 220ae toward the center 220ac (see FIG. 4).

[0041] In this way, by setting the width of slits 211 and 212 to a predetermined width that is, for example, equal to or less than the diameter of foreign matter that can be allowed to pass through pump body 100, it is possible to prevent foreign matter larger than that width from passing through strainer 200 and then through pump body 100. In addition, since slits 211 and 212 are formed to extend from outer periphery 220ae toward central portion 220ac, it is possible to prevent a decrease in the efficiency of draining residual water.

[0042] The plurality of slits 211 are formed in the bottom surface 220b in a generally parallel fashion (see FIG. 4). The plurality of slits 212 are formed in the bottom surface 220b in a generally parallel fashion (see FIG. 4).

[0043] The plurality of slits 211 and the plurality of slits 212 are formed on the bottom surface 220b so that adjacent slits have different lengths (see FIG. 4).

[0044] With this configuration, the distance between the two slits 211 and the distance between the two slits 212 can be made substantially constant, which prevents the slits from getting closer to each other and becoming thinner, thereby reducing the strength of the strainer 200. This ensures the strength of the strainer 200.

[0045] 5 is a perspective view showing a detailed configuration of the casing unit 140 according to the first embodiment of the present invention. As shown in FIG. 5, the casing unit 140 includes a pump casing 310, a wear ring 320, and a suction cover 330.

[0046] The suction cover 330 has a cup shape that opens upward, and an opening that functions as the suction port 160 is formed in the bottom surface. The wear ring 320 is a substantially disk-shaped member that extends along the xy plane, and is connected to the suction cover 330 on the upper side thereof.

[0047] By connecting the wear ring 320 and the suction cover 330, an internal space surrounded by the wear ring 320 and the suction cover 330 is formed.

[0048] The pump casing 310 has a cup shape that opens upward, and an opening that functions as the suction port 160 is formed in the bottom surface. The pump casing 310 is housed in the above-mentioned internal space. The pump casing 310 and the wear ring 320 form the pump chamber 150. Although not shown in FIG. 5, the impeller 130 (see FIG. 2) is housed in the pump chamber 150.

[0049] The pump casing 310, the wear ring 320, and the suction cover 330, i.e., the casing unit 140, are cylindrical as a whole. Three radially protruding convex portions and three concave portions located between the convex portions are formed on the outer periphery of the casing unit 140. Each convex portion is located between the two high-back portions 210H of the strainer 200 and above the low-back portion 210L.

[0050] Three openings 320a are formed at the positions where the three protrusions are formed on the wear ring 320. Below the openings 320a, the pump casing 310 is formed with a bag-shaped portion that extends circumferentially, one end of which communicates with the pump chamber 150, and the other end of which is closed.

[0051] The path from the slit 211 or 212 to the pump body 100 via the suction port 160, the pump chamber 150, the bag-shaped portion and the opening 320a is the flow path FP.

[0052] Of the plurality of slits 211 and the plurality of slits 212, the slits 212 formed at positions corresponding to the flow paths FP are smaller than the slits 211 formed at other positions.

[0053] In this embodiment, the upper end of the slit 212 located below the flow path FP is located lower than the upper end of the slit 211 provided in the tall portion 210H, and the vertical length of the slit 212 is smaller than the vertical length of the slit 211.

[0054] In this way, by arranging the slit 211, which has a long vertical length (large opening area), in a position where it does not interfere with the flow path FP, it is possible to ensure a certain degree of opening area overall, thereby suppressing resistance during suction.

[0055] [Strainer Modification] The opening areas of the slits 211 and 212 formed in the outer peripheral side surface 210a of the strainer 200 are formed so as to expand as they approach the inner peripheral surface. In other words, the opening areas of the multiple slits 211 and 212 are smaller on the outside than on the inside.

[0056] This configuration prevents floating pieces of wood and other objects from getting stuck in the slits, which prevents water from flowing into the strainer 200 and reduces the drainage capacity of the submersible pump 10.

[0057] Furthermore, the plurality of slits 211 and the plurality of slits 212 may be formed on the outer peripheral side surface 210a of the strainer 200 so that their widths increase toward the bottom surface 220b.

[0058] Since the width of the slits 211 and 212 is larger on the lower side, the sludge and cement accumulated on the bottom surface 220b can be easily discharged through the slits 211 and 212.

[0059] Second Embodiment A submersible pump 11 according to a second embodiment will be described. From the second embodiment onwards, descriptions of matters common to the first embodiment will be omitted, and only differences will be described. In particular, similar effects resulting from similar configurations will not be mentioned in each embodiment.

[0060] The submersible pump 11 according to the second embodiment differs from the submersible pump 10 according to the first embodiment in that a notch is provided between two slits in the strainer.

[0061] Fig. 6 is a schematic diagram showing the appearance of a submersible pump 11 according to a second embodiment of the present invention. Fig. 7 is a perspective view of a strainer 201 according to the second embodiment of the present invention, seen from above. Fig. 8 is a perspective view of a strainer 201 according to the second embodiment of the present invention, seen from below.

[0062] As shown in FIGS. 6 to 8, the submersible pump 11 includes a strainer 201 instead of the strainer 200 in comparison with the submersible pump 10 according to the first embodiment.

[0063] In this embodiment, three screw fastening portions 217 are provided at approximately equal intervals along the circumferential direction of cylindrical portion 210 of strainer 201. Strainer 201 is fixed to pump body 100 by fastening screw fastening portions 217 to pump body 100 with screws (nuts).

[0064] The strainer 201 has a plurality of slits 213 that are elongated in the vertical direction. In this embodiment, the strainer 201 has nine slits 213. Specifically, three slits 213 are provided at approximately equal intervals between each of the two screw fastening portions 217. The slits 213 are formed to extend from the outer peripheral side surface 210a to a portion of the bottom surface 220b.

[0065] A cutout portion 216 is provided between the two slits 213. The cutout portion 216 is formed by cutting out a part of the outer peripheral side surface 210a on the side opposite the bottom surface 220b. In this embodiment, four cutout portions 216 are provided at approximately equal intervals between each of the two screw fastening portions 217.

[0066] Two of the four cutout portions 216 are provided between the screw fastening portion 217 and the slit 213. The other two of the four cutout portions 216 are provided between two of the slits 213.

[0067] That is, between each pair of screw fastening portions 217, the notches 216 and the slits 213 are alternately provided along the circumferential direction of the outer peripheral side surface 210a.

[0068] The cylindrical portion 210 extends in a bellows (accordion) shape along the circumferential direction from one screw fastening portion 217 toward the other screw fastening portion 217, while alternately forming notches 216 and slits 213. In other words, the cylindrical portion 210 is zigzag along the circumferential direction from one screw fastening portion 217 toward the other screw fastening portion 217, while alternately forming notches 216 and slits 213.

[0069] For example, when the strainers 200 and 201 are made of a resin such as polyvinyl chloride, the strainers 200 and 201 may soften during hot seasons such as summer. In the strainer 200 (see FIGS. 3 to 5), a portion of the cylindrical portion 210 (hereinafter, sometimes referred to as the L-shaped plate portion 231) located between the two slits 211 (between the two slits 212) divides the cylindrical portion 210 from the outer peripheral side surface 210a to the bottom surface 220b, forming a thin plate. The L-shaped plate portion 231 bends in an L-shape at the connection between the outer peripheral side surface 210a and the bottom surface 220b, forming a tip that protrudes outward. For example, when the submersible pump 10 is installed at an angle and a load is applied to the tip, the L-shaped plate portion 231 may deform and not return to its original shape.

[0070] In contrast, strainer 201 has a cutout portion 216 between two slits 213, and the lower sides of two plate-shaped portions 232 facing each other across cutout portion 216, i.e., the lower sides of cutout portion 216, are connected, thereby increasing rigidity and suppressing deformation of strainer 201 even in hot seasons such as summer.

[0071] Furthermore, by not connecting the upper side of the cutout portion 216, the area of ​​the opening through which water flows can be increased. This allows for a larger inflow rate, thereby preventing a decrease in the discharge rate of the submersible pump 10.

[0072] In this embodiment, a configuration in which the notch 216 is provided between the two slits 213 has been described, but the present invention is not limited to this. A configuration in which an opening is formed in the outer peripheral side surface 210a between the two slits 213 so that the bottom surface 220b remains may also be used. The opening is formed, for example, by connecting the upper sides of two plate-like portions 232 that face each other with the notch 216 in between.

[0073] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0074] 10, 11...Submersible pump, 100...Pump body, 110...Rotating shaft, 120...Motor, 130...Impeller, 140...Casing unit, 150...Pump chamber, 160...Suction port, 170...Discharge port, 200, 201...Strainer, 210...Cylindrical portion, 210a...Outer peripheral side, 210H...High back portion, 210L...Low back portion, 211, 212, 213...Slit, 216...Notch portion, 217...Screw-fastened portion, 220...Bottom, 220a...Facing surface, 220ac...Central portion, 220ae...Outer peripheral portion, 220b...Bottom, 231...L-shaped plate-shaped portion, 232...Plate-shaped portion, 310...Pump casing, 320...Wearing, 320a...Opening, 330...Suction cover, 211a...Water surface, FP...Flow path

Claims

1. A pump body, a strainer disposed to cover the suction port of the pump body, The strainer has an opening formed extending from an outer peripheral side surface of the strainer to at least a part of a bottom surface. Submersible pump.

2. The strainer has an opposing surface facing the suction port and inclined so as to approach the suction port from the outer periphery toward the center.

2. The submersible pump of claim 1.

3. The opening is formed by a plurality of slits.

2. The submersible pump of claim 1.

4. The plurality of slits are formed on the outer peripheral side surface of the strainer so as to increase in width toward the bottom surface.

4. The submersible pump of claim 3.

5. The plurality of slits are formed on the bottom surface so as to have a predetermined width and extend from the outer periphery toward the center.

4. The submersible pump of claim 3.

6. The plurality of slits are formed on the bottom surface such that adjacent slits have different lengths.

6. The submersible pump according to claim 5.

7. Among the plurality of slits, the slits formed at positions corresponding to flow paths formed in the pump body to guide water sucked from the suction port to the discharge port are smaller than the slits formed at other positions.

4. The submersible pump of claim 3.

8. The opening areas of the plurality of slits formed on the outer peripheral side surface of the strainer are formed to expand as they approach the inner peripheral surface.

4. The submersible pump of claim 3.

9. The strainer further includes a notch portion provided between the two slits and formed by cutting out a part of the outer peripheral side surface on the opposite side of the bottom surface.

4. The submersible pump of claim 3.

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