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

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202580004492.8 (22) Application Date 2025.01.07 (30) Priority Data 2024-061514 2024.04.05 JP (85) PCT International Application Entering National Phase Date 2026.03.11 (86) PCT International Application Application Data PCT / JP2025 / 000113 2025.01.07 (87) PCT International Application Publication Data WO2025 / 210974 JA 2025.10.09 (71) Applicant: Tsurumi Manufacturing Co., Ltd. Address: Osaka, Japan (72) Inventors: Kaito Iwama, Yu Terada, Shingo Yoshida (74) Patent Agency: Beijing Qingyihua Intellectual Property Agency (General Partnership) 11201 Patent Agent Song Rongbing (51) Int.Cl. F04D 13 / 08 (2006.01) (54) Invention Title: Underwater Pump (57) Abstract: An underwater pump (10) comprises: a pump body (100); and a filter (200) configured to cover the suction port (160) of the pump body (100), the filter (200) having slits (211 and 212) formed from at least a portion of the outer peripheral side surface (210a) of the filter (200) to the bottom surface (220b). Claims 1 page Description 6 pages Drawings 8 pages CN 121844140 A 2026.04.10 CN 1 21 84 41 40 A 1. An underwater pump, characterized in that it comprises: a pump body; and a filter configured to cover the suction port of the pump body, the filter having an opening formed from at least a portion of the outer peripheral side surface of the filter to the bottom surface. 2. The underwater pump according to claim 1, characterized in that the filter has an opposing surface opposite the inlet and inclined in a manner that approaches the inlet from the outer periphery toward the center. 3. The underwater pump according to claim 1, characterized in that the opening is formed by a plurality of slits. 4. The underwater pump according to claim 3, characterized in that the plurality of slits are formed such that their 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 such that they 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 adjacent slits on the bottom surface have different lengths.7. The underwater pump according to claim 3, wherein the slit formed at the position corresponding to the flow channel among the plurality of slits is smaller than the slits formed at other positions, and the flow channel is formed in the pump body in such a way as to guide water drawn in from the suction port to the discharge port. 8. The underwater pump according to claim 3, wherein the opening area of ​​the plurality of slits formed on the outer peripheral side of the filter is formed to expand as it approaches the inner peripheral surface. 9. The underwater pump according to claim 3, wherein the filter further includes a cut-out portion disposed between two of the slits, and formed by cutting off a portion of the outer peripheral side and the portion opposite to the bottom surface. Claims 1 / 1 page 2 CN 121844140 A Underwater Pump Technical Field

[0001] The present invention relates to underwater pumps. Background Art

[0002] Conventionally, underwater pumps exist for purposes such as draining gushing water at construction sites. An underwater pump, driven by a motor, draws up water accumulated in a sump (water tank) and drains it. To prevent foreign objects from clogging the suction port in the pump body when water is drawn in, a filter is provided to cover the suction port.

[0003] For example, Patent Document 1 discloses an underwater pump that has a plurality of holes of the same diameter on the side of the filter to form a perforated opening. Moreover, in this opening, the density of the holes on the lower side is set to be lower than the density of the holes on the upper side, thereby preventing the holes from clogging and suppressing the intake of small foreign objects.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-287468 Summary of the Invention

[0007] Problems to be Solved by the Invention

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

[0009] For example, it is conceivable to drain water remaining inside the underwater pump (filter) by providing a drain hole on the bottom surface of the filter. However, if the underwater pump is placed on the ground, there is a problem that the hole may become clogged and not drain sufficiently.

[0010] If water remains inside the underwater pump (filter), cement and sludge contained in the water that penetrates into the underwater pump may solidify and adhere, resulting in a possible decrease in the drainage function of the underwater pump.

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

[0012] Solution to the Problem

[0013] One aspect of the present invention is an underwater pump comprising: a pump body; and a filter configured to cover the suction port of the pump body, the filter having an opening formed extending at least a portion of its outer peripheral side surface to a bottom surface.

[0014] In the above solution, the filter may also have an opposing surface opposite the suction port and inclined in a manner that approaches the suction port from the outer periphery toward the center.

[0015] In the above solution, the opening may also be formed by a plurality of slits.

[0016] In the above solution, the plurality of slits may also be formed such that, on the outer peripheral side surface of the filter, the width increases toward the bottom surface.

[0017] In the above solution, the plurality of slits may also be formed such that, on the bottom surface, they have a predetermined width and extend from the outer periphery toward the center.

[0018] In the above solution, the plurality of slits may also be formed such that, on the bottom surface, adjacent slits have different lengths. Instruction manual, page 1 / 6, CN 121844140 A

[0019] In the above embodiment, the slit formed at the position corresponding to the flow channel among the plurality of slits may be smaller than the slits formed at 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.

[0020] In the above embodiment, the opening area of ​​the plurality of slits formed on the outer peripheral side of the filter may also be formed inclined in the thickness direction such that one of the inner peripheral surfaces is larger than the outer peripheral surface.

[0021] In the above embodiment, the filter may also include a cut-out portion provided between two slits and formed by cutting off a portion of the outer peripheral side and the portion opposite to the bottom surface.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide an underwater pump that reduces the amount of water remaining inside the underwater pump (filter) after the operation of the underwater pump body is stopped. Brief Description of the Drawings

[0024] FIG1 is a schematic diagram showing the appearance of the underwater pump 10 according to the first embodiment of the present invention.

[0025] FIG2 is a cross-sectional view showing the internal structure of the underwater pump 10 according to the first embodiment of the present invention.

[0026] FIG3 is a perspective view of the filter 200 of the first embodiment of the present invention viewed from above.

[0027] FIG4 is a top view of the filter 200 of the first embodiment of the present invention viewed from below.

[0028] FIG5 is a perspective view showing the detailed structure of the housing unit 140 of the first embodiment of the present invention.

[0029] FIG6 is a schematic diagram showing the appearance of the underwater pump 11 according to the second embodiment of the present invention.

[0030] FIG7 is a perspective view of the filter 201 of the second embodiment of the present invention viewed from above.

[0031] FIG8 is a perspective view of the filter 201 of the second embodiment of the present invention viewed from below.Detailed Description of Embodiments

[0032] Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the accompanying drawings. In addition, in the embodiments described below, specific examples for implementing the present invention are always given, and the present invention is not explained in a limited way. In addition, for ease of understanding, the same structural elements are sometimes labeled with the same reference numerals in each drawing, and repeated descriptions are omitted.

[0033] <First Embodiment>

[0034] [Structure of the Submersible Pump]

[0035] FIG1 is a schematic diagram showing the appearance of the submersible pump 10 according to the first embodiment of the present invention. In each drawing, the x-axis, y-axis and z-axis are sometimes indicated. The x-axis, y-axis and z-axis form a three-dimensional orthogonal coordinate system in a right-handed system. Hereinafter, the direction of the arrow on the x-axis is sometimes referred to as the x-axis + side, and the direction opposite to the arrow is sometimes referred to as the x-axis - side, and the same applies to other axes. In addition, the z-axis + side and z-axis - side are sometimes referred to as the "upper side" and the "lower side", respectively. In addition, the z-axis direction is sometimes referred to as the "upper and lower direction". Additionally, surfaces orthogonal to the x-axis, y-axis, or z-axis are sometimes referred to as yz-plane, zx-plane, or xy-plane, respectively.

[0036] As shown in FIG1, the underwater pump 10 includes: a pump body 100; and a filter 200 disposed on the lower side of the pump body 100.

[0037] FIG2 is a cross-sectional view showing the internal structure of the underwater pump 10 according to the first embodiment of the present invention. As shown in FIG2, the pump body 100 includes a rotating shaft 110, a motor 120, an impeller 130, and a housing unit 140.

[0038] The pump body 100 has a generally cylindrical shape. An outlet 170 and an inlet 160 are respectively disposed on the upper and lower sides of the pump body 100.

[0039] The underwater pump 10 is a vertical underwater electric pump in which the rotation center axis of the rotating shaft 110 extends in the vertical direction. Rotation Instruction Manual 2 / 6 Page 4 CN 121844140 A Shaft 110 has a cylindrical shape extending 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. 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 included in the motor 120. The rotating shaft 110 transmits the rotational force generated by the motor 120 to the impeller 130.

[0040] A housing unit 140 is provided 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, which separates the space between the pump chamber 150 and the lower side of 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 provided with motion 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, in the pump body 100, a continuous water flow is generated along the flow channel FP, which is arranged in such a way that the water sucked 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] FIG3 is a perspective view of the filter 200 of the first embodiment of the present invention viewed from the top. FIG4 is a top view of the filter 200 of the first embodiment of the present invention viewed from the bottom.

[0044] As shown in FIGS. 2 to 4, the filter 200 includes a cylindrical portion 210 and a bottom portion 220. The bottom 220 is a circular plate-shaped component extending along the xy plane intersecting the z-axis. The bottom 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 220 is not limited to a circular plate shape, as long as it is plate-shaped.

[0045] The cylindrical portion 210 has a generally cylindrical shape extending in the vertical direction. Furthermore, the shape of the cylindrical portion 210 is not limited to a generally cylindrical shape, as long as it is cylindrical. The cylindrical portion 210 includes three raised portions 210H and three recessed portions 210L. The raised portions 210H and the recessed portions 210L are alternately arranged in the circumferential direction. The outer peripheral surfaces of the raised portions 210H and the recessed portions 210L form a smooth outer peripheral side surface 210a throughout the entire range of the cylindrical portion 210.

[0046] The lower end of the high convex portion 210H is aligned with the lower end of the low concave portion 210L and connected to the outer periphery 220ae of the bottom surface 220b. On the other hand, the upper end of the high convex portion 210H is located above the upper end of the low concave portion 210L. By connecting the cylindrical portion 210 and the bottom 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 body 100. By placing the underwater pump 10 in the sump with the bottom surface 220b in contact with the bottom of the sump, the underwater pump 10 stands upright relative to the bottom of the sump with the filter 200 and the pump body 100 located on the lower and upper sides respectively.

[0048] The filter 200 is configured to cover the suction port 160 of the pump body 100. In detail, the filter 200 is connected to the pump body 100 with its opposing surface 220a facing the suction port 160 of the pump body 100. The overall shape of the underwater pump 10 is formed by the filter 200 and the pump body 100.

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

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

[0051] When the water in the sump is drained and the submersible pump 10 is stopped, or when the submersible pump 10 is stopped before the water in the sump is drained and the submersible pump 10 is pulled up from the sump, the residual water accumulated in the pump chamber 150, etc., drips to the bottom surface 220b through the suction port 160 due to gravity. According to the structure formed by the slits 211 and 212 extending from the outer peripheral side 210a to at least the bottom surface 220b in the specification page 3 / 6 5 CN 121844140 A, residual water dripping onto the bottom surface 220b can be quickly discharged to the outside of the underwater pump 10 through the slits 211 and 212, thus preventing residual water from accumulating inside the filter 200.

[0052] In addition, even if the residual water is, for example, water including mud or cement, the residual water can be prevented from accumulating inside the filter 200, thus preventing the sludge and cement that have entered the filter 200 from solidifying and adhering, thereby preventing the drainage function of the underwater pump 10 from decreasing.

[0053] The opposing surface 220a of the bottom 220 is opposite to the suction port 160 and is inclined in a manner that it approaches the suction port 160 from the outer peripheral portion 220ae toward the central portion 220ac (see FIG2). In other words, the bottom surface 220b is formed such that it slopes downward from the central portion 220ac toward the outer peripheral portion 220ae. In this embodiment, the uppermost side of the approximate center of the opposing surface 220a is raised, and it slopes downward from the center toward the outer peripheral portion 220ae.

[0054] According to this structure, when residual water accumulated in the pump chamber 150, etc., drips into 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 on the bottom surface 220b and quickly discharged to the outside of the underwater 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 to extend from the outer peripheral portion 220ae toward the central portion 220ac (see FIG4).

[0056] Thus, by setting the widths of the slits 211 and 212 to a predetermined width, for example, that allows foreign objects larger than that width to pass through the pump body 100, it is possible to suppress foreign objects that are larger than that width from passing through the filter 200 and through the pump body 100. In addition, since they are formed to extend from the outer periphery 220ae toward the central portion 220ac, it is possible to suppress the decrease in the discharge efficiency of residual water.

[0057] A plurality of slits 211 are formed in a substantially parallel manner in the bottom surface 220b (see FIG4). Additionally, a plurality of slits 212 are formed in a substantially parallel manner in the bottom surface 220b (see FIG4).

[0058] The lengths of the slits 211 and 212 that are formed adjacent to each other in the bottom surface 220b are different (see FIG4).

[0059] According to this structure, since the interval between two slits 211 and the interval between two slits 212 can be substantially fixed, it is possible to prevent the slits from becoming too close to each other and thus reducing their strength. Therefore, the strength of the filter 200 can be ensured.

[0060] FIG5 is a perspective view showing the detailed structure of the housing unit 140 according to the first embodiment of the present invention. As shown in FIG5, the housing unit 140 includes a pump housing 310, a wear-resistant member 320, and a suction cap 330.

[0061] The suction cap 330 has a cup shape with an upward opening, and an opening that functions as a suction port 160 is formed on its bottom surface. The wear-resistant component 320 is a generally circular plate-shaped part extending along the xy plane and is connected to the suction cover 330 on the upper side.

[0062] The wear-resistant component 320 is connected to the suction cover 330, thereby forming an internal space surrounded by the wear-resistant component 320 and the suction cover 330.

[0063] The pump housing 310 has a cup shape with an upward opening and an opening that functions as a suction port 160 is formed on the bottom surface. The pump housing 310 is accommodated in the aforementioned internal space. The pump housing 310 and the wear-resistant component 320 form a pump chamber 150. Although not shown in FIG. 5, the pump chamber 150 accommodates an impeller 130 (see FIG. 2).

[0064] The pump housing 310, the wear-resistant component 320, and the suction cover 330, i.e., the housing unit 140, are cylindrical as a whole. Three radially protruding protrusions and three recesses located between the protrusions are formed on the outer periphery of the housing unit 140. Each protrusion is disposed between two high protrusions 210H in the filter 200 and on the upper side of the low concave portion 210L.

[0065] In the wear-resistant part 320, three openings 320a are formed at the positions where the three protrusions are formed. A bag-shaped portion is formed on the pump housing 310, which extends circumferentially below the openings 320a and communicates with the pump chamber 150 at one end and is closed at the other.

[0066] The path from the slits 211 or 212 through the suction port 160, the pump chamber 150, the bag-shaped portion and the openings 320a to the pump body 100 is called the flow channel FP.

[0067] Among the plurality of slits 211 and the plurality of slits 212, the slit 212 formed at the position corresponding to the flow channel FP is smaller than the slits 211 formed at other positions.

[0068] In this embodiment, the upper end of the slit 212 located on the lower side of the flow channel FP is located further down than the upper end of the slit 211 provided on the high protrusion 210H, and the vertical length of the slit 212 is less than the vertical length of the slit 211.

[0069] Thus, according to the structure of arranging the slit 211, which has a long vertical length (large opening area), in a position that does not interfere with the flow channel FP, a certain opening area can be ensured as a whole, thereby suppressing the resistance during suction.

[0070] [Modified Example of Filter]

[0071] The opening areas of the slits 211 and 212 formed on the outer peripheral side surface 210a of the filter 200 are formed 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, it is possible to suppress wood chips and the like floating in the water from getting stuck in the slits. Therefore, it is possible to suppress the inflow of water into the interior of the filter 200, thereby suppressing the decrease in the drainage capacity of the underwater pump 10.

[0073] In addition, the plurality of slits 211 and the plurality of slits 212 may also be formed such that the width of the outer peripheral side 210a of the filter 200 increases towards the bottom surface 220b.

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

[0075] <Second Embodiment>

[0076] The underwater pump 11 of the second embodiment will be described. The description of things common to the first embodiment will be omitted after the second embodiment, and only the differences will be described. In particular, the same effects produced by the same structure will not be mentioned in each embodiment.

[0077] The difference between the underwater pump 11 of the second embodiment and the underwater pump 10 of the first embodiment is that a cutout is provided between the two slits in the filter.

[0078] FIG6 is a schematic view showing the appearance of the underwater pump 11 according to the second embodiment of the present invention. FIG7 is a perspective view of the filter 201 of the second embodiment of the present invention viewed from above. FIG8 is a perspective view of the filter 201 of the second embodiment of the present invention viewed from below.

[0079] As shown in FIG6 to FIG8, the underwater pump 11 has a filter 201 instead of a filter 200, compared to the underwater 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 have a shape that is longer 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 210a to a portion of the bottom surface 220b.

[0082] Between two slits 213, a cutout 216 is provided on the opposite side of the outer peripheral side 210a and the bottom surface 220b, as shown on page 5 / 6 of this specification 7 CN 121844140 A. In this embodiment, four cutouts 216 are arranged at approximately equal intervals in each of the two threaded fasteners 217.

[0083] Two of the four cutouts 216 are provided between the threaded fasteners 217 and the slits 213. The other two of the four cutouts 216 are provided between the two slits 213.

[0084] That is, in each of the two threaded fastening portions 217, the cutout portion 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 the cutout portion 216 and the slit 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 the cutout portion 216 and the slit 213.

[0086] For example, when the filters 200 and 201 are formed of a resin such as vinyl chloride, the filters 200 and 201 may soften in seasons with relatively high temperatures, such as summer. In the filter 200 (see Figures 3-5), 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, applying a load to the front end causes the L-shaped plate section 231 to deform, and sometimes it cannot directly return to its original shape.

[0087] In contrast, in the filter 201, the structure in which a cutout portion 216 is provided between the two slits 213 and the lower side of the two plate-shaped portions 232 facing each other across the cutout portion 216 is connected can improve rigidity, thus suppressing deformation of the filter 201 even in hot seasons such as summer.

[0088] Furthermore, the structure in which the upper side of the cutout portion 216 is not connected can increase the area of ​​the opening for water flow. This increases the inflow rate, thus suppressing a decrease in the discharge rate of the underwater pump 10.

[0089] Furthermore, in this embodiment, the structure in which a cutout 216 is provided between the two slits 213 has been described, but it is not limited thereto. It is also possible that an opening is formed on the outer peripheral side 210a between the two slits 213, leaving the bottom surface 220b exposed. This opening is formed, for example, by connecting the upper sides of two plate-like portions 232 that are opposed to each other across the cutout 216.

[0090] The embodiments described above are intended to facilitate understanding of the present invention and are not intended to limit the interpretation of the present invention. The various elements, their configurations, materials, conditions, shapes, and dimensions, etc., provided in the embodiments are not limited to the examples described and can be appropriately modified. Furthermore, the structures shown in different embodiments can be partially substituted or combined with each other.

[0091] Explanation of reference numerals:

[0092] 10, 11… underwater pump, 100… pump 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 part, 210a… outer peripheral side, 210H… high convex part, 210L… low concave part, 211, 212, 213… slit, 216… cut-out part, 217… threaded fastening part, 220… bottom, 220a… opposing surface, 220ac… central part, 220ae… outer peripheral part, 220b… bottom surface, 231… L-shaped plate part, 232…plate-shaped part, 310…pump casing, 320…wear-resistant part, 320a…opening, 330…suction cover, 211a…water surface, FP…flow channel. Instruction manual, page 6 / 6, CN 121844140 A, Figure 1; Instruction manual, Figure 1 / 8, page 9, CN 121844140 A, Figure 2; Instruction manual, Figure 2 / 8, page 10, CN 121844140 A, Figure 3; Instruction manual, Figure 3 / 8, page 11, CN 121844140 A, Figure 4; Instruction manual, Figure 4 / 8, page 12, CN 121844140 A, Figure 5; Instruction manual, Figure 5 / 8, page 13, CN 121844140 A, Figure 6; Instruction manual, Figure 6 / 8, page 14, CN 121844140 A, Figure 7; Instruction manual, Figure 7 / 8, page 15, CN 121844140 A, Figure 8; Instruction manual, Figure 8 / 8, page 16, CN 121844140 A.

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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