Underwater pump

Abstract

An underwater pump (10) is provided with: a pump main body (100); and a filter (200) disposed so as to cover the suction port (160) of the pump body (100), the filter (200) having slits (211 and 212) formed so as to extend from the outer peripheral side surface (210a) of the filter (200) to at least a part of the bottom surface (220b).

Description

TECHNICAL FIELD

[0001] The present application relates to an underwater pump. BACKGROUND

[0002] Conventionally, there is an underwater pump used for water discharge and the like in a construction site. The underwater pump is driven by a motor to suck up and discharge water accumulated in a sump (water tank), and has a filter covering an intake port in the pump main body in order to prevent foreign matter from clogging the intake port when water is sucked.

[0003] For example, Patent Literature 1 discloses an underwater pump having a plurality of holes of the same diameter perforated in an opening portion of a filter in a predetermined arrangement. Further, in the opening portion, the arrangement density of the holes is set to be lower in a lower portion than in an upper portion, thereby preventing clogging of the holes and suppressing intake of small foreign matter.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2009-287468 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the underwater pump disclosed in Patent Literature 1, water and the like remaining inside the underwater pump (filter) is not taken into consideration after the operation of the underwater pump main body is stopped.

[0009] For example, it is conceivable to provide a drain hole in the bottom surface of the filter to discharge water remaining inside the underwater pump (filter), but if the underwater pump is provided on the ground, there is a problem that the hole is clogged and water cannot be sufficiently discharged.

[0010] If water remains inside the underwater pump (filter), cement and sludge contained in the water and intruding into the inside of the underwater pump solidify and adhere, for example, when water is sucked, as a result, the water discharge function of the underwater pump can be degraded.

[0011] Therefore, an object of the present application is to provide an underwater pump that reduces water remaining inside the underwater pump (filter) after the operation of the underwater pump main body is stopped.

[0012] MEANS FOR SOLVING THE PROBLEMS

[0013] An underwater pump according to one aspect of the present application includes a pump main body, and a filter arranged to cover an intake port of the pump main body, the filter having an opening portion formed from a portion of a bottom surface to at least an outer peripheral side surface of the filter.

[0014] In the above aspect, the filter can also have an opposing surface that opposes the suction port and is inclined so as to approach the suction port as it goes from the outer peripheral portion toward the central portion.

[0015] In the above aspect, the opening portion can also be formed by a plurality of slits.

[0016] In the above aspect, the plurality of slits can also be formed so as to increase in width as they go toward the bottom surface from the outer peripheral side surface of the filter.

[0017] In the above aspect, the plurality of slits can also be formed so as to have a predetermined width at the bottom surface and extend from the outer peripheral portion toward the central portion.

[0018] In the above aspect, the plurality of slits can also be formed so as to differ in length of the slits that are adjacent to each other at the bottom surface.

[0019] In the above aspect, among the plurality of slits, the slits formed at positions corresponding to flow passages formed in the pump main body so as to guide water drawn in from the suction port to the discharge port can be smaller than the slits formed at other positions.

[0020] In the above aspect, the plurality of slits formed at the outer peripheral side surface of the filter can also be formed so as to be inclined in the thickness direction with the inner peripheral surface side being larger than the outer peripheral surface side.

[0021] In the above aspect, the filter can also further include a cutout portion provided between two slits and cut out by a portion of the outer peripheral side surface and a portion of the opposite side of the bottom surface.

[0022] Effects of Invention

[0023] According to the present application, it is possible to provide an underwater pump that reduces water remaining inside an underwater pump (filter) after stopping operation of a pump main body. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a diagram showing an outline of the external appearance of an underwater pump 10 of a first embodiment of the present application.

[0025] Figure 2 is a cross-sectional view showing the internal structure of the underwater pump 10 of the first embodiment of the present application.

[0026] Figure 3 is a perspective view of a filter 200 of the first embodiment of the present application as viewed from the upper side.

[0027] Figure 4 is a plan view of the filter 200 of the first embodiment of the present application as viewed from the lower side.

[0028] Figure 5is a perspective view showing a detailed structure of the casing unit 140 of the first embodiment of the present application.

[0029] Figure 6 is a schematic view showing an external appearance of the underwater pump 11 of the second embodiment of the present application.

[0030] Figure 7 is a perspective view of the filter 201 of the second embodiment of the present application, as viewed from the upper side.

[0031] Figure 8 is a perspective view of the filter 201 of the second embodiment of the present application, as viewed from the lower side. DETAILED DESCRIPTION

[0032] Hereinafter, a preferred embodiment of the present application will be specifically described with reference to the accompanying drawings. Furthermore, in the following described embodiment, a specific example for implementing the present application is always cited, and the present application is not limitedly explained. In addition, in order to easily understand the description, the same reference numerals are sometimes attached to the same structural elements in each drawing, and repeated description is omitted.

[0033] <First Embodiment>

[0034] [Structure of Underwater Pump]

[0035] Figure 1 is a schematic view showing an external appearance of the underwater pump 10 of the first embodiment of the present application. In each drawing, sometimes x-axis, y-axis, and z-axis are shown. The x-axis, y-axis, and z-axis form a right-hand system of three-dimensional orthogonal coordinates. Hereinafter, sometimes the arrow direction of the x-axis is referred to as the x-axis + side, and the direction opposite to the arrow is referred to as the x-axis - side, and the same applies to other axes. Furthermore, sometimes the z-axis + side and the z-axis - side are referred to as "upper side" and "lower side", respectively. In addition, sometimes the z-axis direction is referred to as "vertical direction". In addition, sometimes the planes orthogonal to the x-axis, y-axis, or z-axis are referred to as yz plane, zx plane, or xy plane, respectively.

[0036] As shown in Figure 1 , the underwater pump 10 is provided with: a pump body 100; and a filter 200 provided at the lower side of the pump body 100.

[0037] Figure 2 is a sectional view showing an internal structure of the underwater pump 10 of the first embodiment of the present application. As shown in Figure 2 , the pump body 100 includes a rotating shaft 110, a motor 120, an impeller 130, and a casing unit 140.

[0038] The pump body 100 has a substantially cylindrical shape. At the upper side and the lower side of the pump body 100, a discharge port 170 and a suction port 160 are provided, respectively.

[0039] The underwater pump 10 is a vertical underwater electric pump in which the rotational center axis of the rotating shaft 110 extends vertically. The rotating shaft 110 has a cylindrical shape extending vertically and is rotatably fixed to the pump body 100. An impeller 130 is fixed to the lower end of the rotating shaft 110. The rotor of the motor 120 is fixed to the upper side of the rotating shaft 110. The rotation of the rotating shaft 110 is driven by the electromagnetic force between the stator and the rotor of the motor 120. The rotating shaft 110 transmits the rotational force generated by the motor 120 to the impeller 130.

[0040] The housing unit 140 is disposed below the motor 120 and forms a pump chamber 150 that accommodates the impeller 130. A suction port 160 with an opening in the wall is provided below the rotating shaft 110, the wall separating the pump chamber 150 from the space below the housing unit 140. Water intended for drainage is guided from the space below the housing unit 140 to the pump chamber 150 through the suction port 160.

[0041] If the impeller 130 is rotated by driving the motor 120, the water guided to the pump chamber 150 is propelled by the impeller 130, moves along the flow channel FP, and is discharged from the outlet 170. As the water guided to the pump chamber 150 is discharged, new water flows into the pump chamber 150 from the space on the lower side of the housing unit 140 through the suction port 160. Thus, a continuous water flow is generated in the pump body 100 along the flow channel FP, which is arranged such that water drawn in from the suction port 160 is guided through the pump chamber 150 to the outlet 170, and the water is discharged by the submersible pump 10.

[0042] [Structure of the filter]

[0043] Figure 3 This is a perspective view of the filter 200 according to the first embodiment of the present invention, viewed from above. Figure 4 This is a top view of the filter 200 according to the first embodiment of the present invention, viewed from below.

[0044] like Figures 2 to 4 As shown, the filter 200 includes a cylindrical portion 210 and a bottom portion 220. The bottom portion 220 is a circular plate-shaped component extending along an xy plane intersecting the z-axis. The bottom portion 220 has an upper opposing surface 220a and a bottom surface 220b on the opposite side of the opposing surface 220a. Furthermore, the shape of the bottom portion 220 is not limited to a circular plate shape; it can be any plate shape.

[0045] The cylindrical portion 210 has a substantially cylindrical shape extending in the up-down direction. Furthermore, the shape of the cylindrical portion 210 is not limited to a substantially cylindrical shape, and can be any shape as long as it is cylindrical. The cylindrical portion 210 includes three high projections 210H and three low depressions 210L. The high projections 210H and the low depressions 210L are alternately arranged in the circumferential direction. The outer peripheral side surface 210a of the entire range of the cylindrical portion 210 is formed by the outer peripheral surface of the high projections 210H and the outer peripheral surface of the low depressions 210L.

[0046] The end portion of the lower side of the high projection 210H is aligned with the end portion of the lower side of the low depression 210L, and is connected to the outer peripheral portion 220ae of the bottom surface 220b. On the other hand, the end portion of the upper side of the high projection 210H is located on the upper side compared to the end portion of the upper side of the low depression 210L. By connecting the cylindrical portion 210 and the bottom portion 220, the filter 200 has a cup shape with an opening on the upper side when viewed as a whole.

[0047] The upper side of the filter 200 is connected to the lower side of the pump main body 100. By placing the submersible pump 10 in the sump in such a manner that the bottom surface 220b contacts the water bottom of the sump, the submersible pump 10 is self-standing with respect to the water bottom in a state in which the filter 200 and the pump main body 100 are located on the lower side and the upper side, respectively.

[0048] The filter 200 is arranged so as to cover the suction port 160 of the pump main body 100. In detail, the filter 200 is connected to the pump main body 100 in such a manner that the opposing surface 220a opposes the suction port 160 of the pump main body 100. The entire shape of the submersible pump 10 is formed by the filter 200 and the pump main body 100.

[0049] The filter 200 has one or a plurality of opening portions formed from at least a portion of the outer peripheral side surface 210a to the bottom surface 220b. In the present embodiment, the opening portions are formed by, for example, a plurality of slits 211 ("opening portion" example) and a plurality of slits 212 ("opening portion" example).

[0050] The plurality of slits 211 are formed in the high projections 210H. The plurality of slits 212 are formed in the low depressions 210L.

[0051] When the discharge of water in the sump ends and the submersible pump 10 is stopped, or when the discharge of water in the sump ends, the submersible pump 10 is stopped, and the submersible pump 10 is pulled out of the sump, the residual water accumulated in the pump chamber 150 and the like drips to the bottom surface 220b through the suction port 160 due to gravity. According to the structure in which the slits 211 and 212 are formed from at least a portion of the outer peripheral side surface 210a to the bottom surface 220b, the residual water that drips to the bottom surface 220b can be quickly discharged to the outside of the submersible pump 10 from the slits 211 and 212, and thus it is possible to suppress the residual water from remaining in the inside of the filter 200.

[0052] In addition, even if the residual water is water including mud water, cement, for example, the residual water can be inhibited from remaining inside the filter 200, and thus the sludge and cement that intrude into the inside of the filter 200 can be inhibited from solidifying and adhering, and further the drainage function of the submersible pump 10 can be inhibited from deteriorating.

[0053] The opposing surface 220a of the bottom portion 220 opposes the suction port 160 and is inclined so as to approach the suction port 160 as it goes from the outer peripheral portion 220ae toward the central portion 220ac (see FIG. 2). Figure 2 In other words, the bottom surface 220b is formed so as to be inclined downward from the central portion 220ac toward the outer peripheral portion 220ae. In the present embodiment, the substantially center of the opposing surface 220a is raised to the uppermost side, and from the center, it becomes a downward slope toward the outer peripheral portion 220ae.

[0054] According to this structure, in a case where the residual water accumulated in the pump chamber 150 or the like drips to the bottom surface 220b through the suction port 160 due to gravity, the residual water can be moved to the outer peripheral portion 220ae by the slope formed in the bottom surface 220b and rapidly discharged to the outside of the submersible pump 10 from the slits 211 and 212.

[0055] The plurality of slits 211 and the plurality of slits 212 have a predetermined width in the bottom surface 220b and are formed so as to extend from the outer peripheral portion 220ae toward the central portion 220ac (see FIG. 2). Figure 4

[0056] Thus, by setting the width of the slits 211 and 212 to a predetermined width that can allow a diameter of a foreign object that passes through the pump main body 100, for example, it is possible to inhibit a foreign object larger than the width from passing through the filter 200 and the pump main body 100. In addition, since it is formed so as to extend from the outer peripheral portion 220ae toward the central portion 220ac, it is possible to inhibit a decrease in the discharge efficiency of the residual water.

[0057] The plurality of slits 211 are formed so as to be substantially parallel in the bottom surface 220b (see FIG. 2). Figure 4 In addition, the plurality of slits 212 are formed so as to be substantially parallel in the bottom surface 220b (see FIG. 2). Figure 4

[0058] The plurality of slits 211 and the plurality of slits 212 are formed so as to have different lengths of the slits adjacent to each other in the bottom surface 220b (see FIG. 2). Figure 4

[0059] According to this structure, since it is possible to substantially fix the interval between the two slits 211 and the interval between the two slits 212, it is possible to inhibit the slits from becoming thin-walled and decreasing in strength as they approach each other. Thus, it is possible to ensure the strength of the filter 200.​​​

[0060] Figure 5 is a perspective view showing a detailed structure of the casing unit 140 of the first embodiment of the present application. As shown in the drawing, the casing unit 140 includes a pump casing 310, a wear piece 320, and a suction cover 330. Figure 5

[0061] The suction cover 330 has a cup shape open upward, and an opening portion functioning as the suction port 160 is formed in a bottom surface. The wear piece 320 is a substantially circular plate-shaped member extending along the xy plane, and is connected to the suction cover 330 on the upper side of the suction cover 330.

[0062] By connecting the wear piece 320 to the suction cover 330, an internal space surrounded by the wear piece 320 and the suction cover 330 is formed.

[0063] The pump casing 310 has a cup shape open upward, and an opening portion functioning as the suction port 160 is formed in a bottom surface. The pump casing 310 is housed in the above-described internal space. A pump chamber 150 is formed by the pump casing 310 and the wear piece 320. Although not shown in the drawing, an impeller 130 (refer to FIG. 2) is housed in the pump chamber 150. Figure 5 Figure 2

[0064] The pump casing 310, the wear piece 320, and the suction cover 330, that is, the casing unit 140 as a whole is cylindrical. Three protruding portions projecting in the radial direction and three recessed portions between the protruding portions are formed in the outer periphery of the casing unit 140. Each of the protruding portions is provided on the upper side of the low recessed portion 210L between the two high protruding portions 210H in the filter 200.

[0065] In the wear piece 320, three opening portions 320a are formed at positions where the three protruding portions are formed. A bag-shaped portion extending in the circumferential direction on the lower side of the opening portion 320a and having one end communicating with the pump chamber 150 and the other end closed is formed in the pump casing 310.

[0066] A path from the slits 211 or 212, through the suction port 160, the pump chamber 150, the bag-shaped portion, and the opening portion 320a, to the pump main body 100 becomes a flow passage FP.

[0067] Among the plurality of slits 211 and the plurality of slits 212, the slits 212 formed at positions corresponding to the flow passage FP are smaller than the slits 211 formed at other positions.

[0068] In the present embodiment, the end portion of the slits 212 on the upper side of the lower side of the flow passage FP is located more on the lower side than the end portion on the upper side of the slits 211 provided to the high protruding portion 210H, and the length in the vertical direction of the slits 212 is smaller than the length in the vertical direction of the slits 211. ​​​

[0069] Thus, according to the structure in which the slit 211 having a long length in the up-down direction (large opening area) is disposed at a position not interfering with the flow passage FP, a certain degree of opening area can be ensured as a whole, and thus the resistance at the time of suction can be suppressed.

[0070] [Deformed Example of Filter]

[0071] The opening areas of the slits 211 and 212 formed in the outer peripheral side surface 210a of the filter 200 are formed so as to expand as they approach the inner peripheral surface. That is, the outer side is smaller than the inner side in terms of the opening areas of the plurality of slits 211 and 212.

[0072] According to this structure, the wood chips and the like floating in the water can be suppressed from being caught in the slits. Thus, the inflow of water into the inside of the filter 200 can be suppressed from being hindered, and thus the decrease in the discharge capacity of the submersible pump 10 can be suppressed.

[0073] In addition, the plurality of slits 211 and the plurality of slits 212 can also be formed so as to have widths that increase as they approach the bottom surface 220b in the outer peripheral side surface 210a of the filter 200.

[0074] Since the widths of the slits 211 and 212 increase on the lower side, the sludge and the cement accumulated in the bottom surface 220b can be easily discharged from the slits 211 and 212.

[0075] <Second Embodiment>

[0076] The submersible pump 11 of the second embodiment will be described. The description of matters common to the first embodiment will be omitted in the second embodiment, and only the different points will be described. In particular, the same effects based on the same structure will not be mentioned in each embodiment in order.

[0077] The submersible pump 11 of the second embodiment differs from the submersible pump 10 of the first embodiment in that a cutout portion is provided between the two slits in the filter.

[0078] Figure 6 is a diagram schematically showing the appearance of the submersible pump 11 of the second embodiment of the present application. Figure 7 is a perspective view of the filter 201 of the second embodiment of the present application as viewed from the upper side. Figure 8 is a perspective view of the filter 201 of the second embodiment of the present application as viewed from the lower side.

[0079] As shown in Figures 6 to 8 , the submersible pump 11 has the filter 201 instead of the filter 200 as compared with the submersible pump 10 of the first embodiment.

[0080] In this embodiment, three threaded fastening portions 217 are provided at approximately equal intervals along the circumference of the cylindrical portion 210 in the filter 201. The threaded fastening portions 217 are fixed to the pump body 100 by screws (nuts), thereby fixing the filter 201 to the pump body 100.

[0081] The filter 201 has a plurality of slits 213, which are elongated in the vertical direction. In this embodiment, the filter 201 has nine slits 213. Specifically, three slits 213 are arranged at approximately equal intervals in each of the two threaded fasteners 217. The slits 213 are formed extending from the outer peripheral side surface 210a to a portion of the bottom surface 220b.

[0082] Between the two slits 213, a cutout 216 is provided, in which a portion of the outer peripheral side surface 210a is cut off and the portion opposite to the bottom surface 220b is removed. In this embodiment, four cutouts 216 are provided at approximately equal intervals between each of the two threaded fasteners 217.

[0083] Two of the four cutouts 216 are located between the threaded fastening part 217 and the slit 213. The other two of the four cutouts 216 are located between the two slits 213.

[0084] That is, in each of the two threaded fasteners 217, the cutout 216 and the slit 213 are alternately arranged along the circumferential direction of the outer peripheral side surface 210a.

[0085] The cylindrical portion 210 extends circumferentially in a corrugated (foldable) manner from one threaded fastening portion 217 toward the other threaded fastening portion 217, while alternately forming cutout portions 216 and slits 213. In other words, the cylindrical portion 210 bends circumferentially from one threaded fastening portion 217 toward the other threaded fastening portion 217, while alternately forming cutout portions 216 and slits 213.

[0086] For example, when filters 200 and 201 are made of resins such as vinyl chloride, they may soften during hot seasons such as summer. In filter 200 (refer to...) Figures 3 to 5 In the underwater pump 10, a portion of the cylindrical section 210 located between the two slits 211 (between the two slits 212) (hereinafter sometimes referred to as the L-shaped plate section 231) is divided from the outer peripheral side 210a to the bottom surface 220b, becoming a thin plate. In the L-shaped plate section 231, the connection between the outer peripheral side 210a and the bottom surface 220b is bent into an L-shape, forming a front end that protrudes outward. For example, when the underwater pump 10 is tilted, if a load is applied to the front end, the L-shaped plate section 231 deforms and sometimes cannot directly return to its original shape.

[0087] In contrast, in the filter 201, the structure in which the cutout portion 216 is provided between the two slits 213 and the lower side of the cutout portion 216, that is, the lower side of the two plate-shaped portions 232 facing each other with the cutout portion 216 interposed therebetween, is connected, can improve rigidity, and thus can suppress deformation of the filter 201 even in seasons with high air temperature such as summer.

[0088] In addition, according to the structure in which the upper side of the cutout portion 216 is not connected, the area of the opening through which water flows can be increased. Thus, the inflow amount can be increased, and thus the discharge amount of the submersible pump 10 can be suppressed from decreasing.

[0089] Further, in the present embodiment, the structure in which the cutout portion 216 is provided between the two slits 213 is described, but is not limited thereto. The structure in which an opening portion is formed on the outer peripheral side surface 210a in such a manner that the bottom surface 220b is left between the two slits 213 can also be employed. The opening portion is formed, for example, by connecting the upper side of the two plate-shaped portions 232 facing each other with the cutout portion 216 interposed therebetween.

[0090] The embodiments described above are for facilitating understanding of the present application and are not intended to limit the explanation of the present application. The elements and their arrangement, materials, conditions, shapes, and dimensions, and the like possessed by the embodiments are not limited to the examples described, but can be appropriately changed. In addition, the structures shown in different embodiments can be partially replaced or combined with each other.

[0091] Explanation of Reference Numerals:

[0092] 10, 11 … submersible pump, 100 … pump main body, 110 … rotating shaft, 120 … motor, 130 … impeller, 140 … housing unit, 150 … pump chamber, 160 … suction port, 170 … discharge port, 200, 201 … filter, 210 … cylindrical portion, 210a … outer peripheral side surface, 210H … high convex portion, 210L … low concave portion, 211, 212, 213 … slit, 216 … cutout portion, 217 … threaded fastening portion, 220 … bottom portion, 220a … facing surface, 220ac … central portion, 220ae … outer peripheral portion, 220b … bottom surface, 231 … L-shaped plate-shaped portion, 232 … plate-shaped portion, 310 … pump housing, 320 … wear-resistant member, 320a … opening portion, 330 … suction cover, 211a … water surface, FP … flow passage.

Claims

1. An underwater pump, characterized in that, have: Pump body; and A filter configured to cover the suction inlet of the pump body, The filter has an opening that extends at least a portion of its outer peripheral side to its bottom surface.

2. The underwater pump according to claim 1, characterized in that, The filter has an opposing surface that faces the inlet and is inclined toward the inlet as it moves from the outer periphery toward the center.

3. The underwater pump according to claim 1, characterized in that, The opening is formed by multiple slits.

4. The underwater pump according to claim 3, characterized in that, The plurality of slits are formed such that the width increases toward the bottom surface on the outer peripheral side of the filter.

5. The underwater pump according to claim 3, characterized in that, The plurality of slits are formed to have a predetermined width on the bottom surface and extend from the outer periphery toward the center.

6. The underwater pump according to claim 5, characterized in that, The plurality of slits are formed such that, on the bottom surface, adjacent slits have different lengths.

7. The underwater pump according to claim 3, characterized in that, Of the plurality of slits, the slit formed at the position corresponding to the flow channel is smaller than the slits formed at the other positions. The flow channel is formed in the pump body in such a way that it guides the water drawn in from the suction port to the discharge port.

8. The underwater pump according to claim 3, characterized in that, The opening regions of the plurality of slits formed on the outer peripheral side of the filter are configured to expand as they approach the inner peripheral surface.

9. The underwater pump according to claim 3, characterized in that, The filter also includes a cutout portion disposed between the two slits and formed by cutting off a portion of the outer peripheral side surface and the portion opposite to the bottom surface.

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