Submerged pump

Abstract

To provide a submerged pump capable of shortening a time required for maintenance of an impeller and a pump chamber.SOLUTION: A submerged pump 10 includes: a pump casing 310 having a suction port 160, and forming a pump chamber 150 in which an impeller 130 for sucking water from the suction port is arranged; a strainer 200 having a bottom 220 formed with two or more openings 221, and arranged so as to cover the suction port 160; and a suction cover 330 arranged between the strainer 200 and the pump casing 310 so as to cover the pump casing 310, and having two or more projections 331 projecting from the two or more openings 221.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Submersible pumps have been used in 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 an impeller for drawing in water, a pump casing that forms a pump chamber that houses the impeller, and a strainer that covers the suction port of the pump chamber to prevent foreign matter from clogging the suction port when water is being drawn in.

[0003] For example, in Patent Document 1, the pump casing is divided into an intermediate casing and a lower casing, and the intermediate casing is attached to the motor with bolts. The strainer is attached to the outer periphery of the lower casing with a narrow gap between them, surrounding the entire side of the lower casing. Bolts extend from below the bottom plate that supports the strainer and lower casing from below, through holes in the lower casing, and are screwed into the intermediate casing. This allows the lower casing, strainer, and bottom plate to be attached together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-208383 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the submersible pump disclosed in Patent Document 1, the pump chamber and impeller are exposed by removing the bolts, the bottom plate, and then the strainer and lower casing. This poses a problem in that it takes time to perform maintenance such as checking, cleaning, or replacing the pump chamber and impeller.

[0006] Therefore, an object of the present invention is to provide an underwater pump that can reduce the time required for maintenance of the impeller and pump chamber. [Means for solving the problem]

[0007] An underwater pump according to one embodiment of the present invention comprises a pump casing having an intake port and forming a pump chamber in which an impeller for drawing water through the intake port is disposed, a strainer having a bottom with at least two openings formed therein and disposed so as to cover the intake port, and a suction cover disposed between the strainer and the pump casing so as to cover the pump casing, and having at least two protrusions each protruding from the at least two openings.

[0008] In the above aspect, the bottom of the strainer may include a first bottom surface and a second bottom surface that is recessed from the opening to the outer periphery from the first bottom surface.

[0009] In the above aspect, the bottom of the strainer may further include a side surface formed to face the central portion at the step between the first bottom surface and the second bottom surface.

[0010] In the above aspect, the protrusion of the suction cover may protrude from the opening along a side surface of the strainer.

[0011] In the above aspect, the at least two protrusions of the suction cover may be formed to face the center of the bottom of the strainer.

[0012] In the above aspect, the at least two protrusions of the suction cover may be formed to face each other.

[0013] In the above aspect, the thickness of the protruding portion of the suction cover may be thicker than the thickness of the other portion of the suction cover.

[0014] In the above aspect, the protrusion of the suction cover may include a recess recessed toward the center of the bottom of the strainer.

[0015] In the above aspect, each of the suction cover and the pump casing may have a cup shape, and the inner side surface of the suction cover and the outer side surface of the pump casing may abut against each other.

[0016] In the above aspect, a portion of the outer side surface of the pump casing may extend perpendicular to the bottom of the suction cover, and the inner side surface of the suction cover may be tapered so as to narrow as it approaches the bottom of the suction cover.

[0017] In the above aspect, each of the suction cover and the pump casing may have a cup shape, and the inner side surface of the suction cover and the outer side surface of the pump casing may be provided with mating concave and convex portions, respectively.

[0018] In the above aspect, the strainer, pump casing, and suction cover may be separable from one another, and the strainer and suction cover may be fixed to the pump body by two screws that are provided on either side of the center of the bottom of the strainer, with the suction cover covering the pump casing. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide an underwater pump that can reduce the time required for maintenance of the impeller and pump chamber. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram showing the appearance of a submersible pump 10 according to an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view showing a schematic internal structure of a submersible pump 10 according to an embodiment of the present invention. [Figure 3]1 is a perspective view of a casing unit 140 and a strainer 200 in an assembled state according to an embodiment of the present invention, as viewed from below. [Figure 4] 1 is a perspective view of a casing unit 140 and a strainer 200 in a separated state according to an embodiment of the present invention, as viewed from below. [Figure 5] 1 is a perspective view of a casing unit 140 and a strainer 200 in a separated state according to an embodiment of the present invention, as viewed from above. [Figure 6] 3 is an enlarged cross-sectional view of a portion where a pump casing 310 and a suction cover 330 contact each other according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] 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.

[0022] <One embodiment> [Submersible pump configuration] FIG. 1 is a schematic diagram showing the exterior of a submersible pump 10 according to one 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.

[0023] As shown in FIG. 1, the submersible pump 10 includes a pump body 100, a casing unit 140 provided below the pump body 100, and a strainer 200.

[0024] Figure 2 is a cross-sectional view showing a schematic internal structure of a submersible pump 10 according to one embodiment of the present invention. As shown in Figures 1 and 2, the pump body 100 has a generally cylindrical shape. A discharge port 170 is provided on the upper side of the pump body 100. A suction port 160 is provided on the lower side of the casing unit 140.

[0025] The strainer 200 and the casing unit 140 are assembled and provided below the pump body 100. The casing unit 140 forms a pump chamber 150.

[0026] The pump body 100 includes a rotating shaft 110 , a motor 120 , an impeller 130 , and an oil casing 180 .

[0027] The oil casing 180 is provided above the casing unit 140. The motor 120 is provided above the oil casing 180. The impeller 130 is provided in the pump chamber 150.

[0028] 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 fixed to the pump body 100 so as to be rotatable.

[0029] 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.

[0030] The suction port 160 is located below the rotary shaft 110. Water to be discharged is guided into the pump chamber 150 from a space 220g below the casing unit 140 through the suction port 160.

[0031] 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 220g 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.

[0032] Figure 3 is a perspective view of the casing unit 140 and strainer 200 in an assembled state according to one embodiment of the present invention, as viewed from below. Figures 4 and 5 are perspective views of the casing unit 140 and strainer 200 in a separated state according to one embodiment of the present invention, as viewed from below and above, respectively.

[0033] As shown in FIGS. 2 to 5, the casing unit 140 includes a pump casing 310, a wear ring 320, and a suction cover 330.

[0034] The strainer 200, the pump casing 310, the suction cover 330, and the wear ring 320 are separable from one another (see FIGS. 4 and 5). For example, they are separated during maintenance such as disassembly, cleaning, and part replacement.

[0035] When the submersible pump 10 is used to supply or discharge water, the strainer 200, pump casing 310, suction cover 330, and wear ring 320 are attached together to the underside of the oil casing 180 in the pump body 100 with two screws 400. In this way, by using two screws 400 to secure the strainer 200 and casing unit 140 to the pump body 100, the number of steps required to fasten and loosen the screws 400 can be reduced.

[0036] [Stretcher 200 Configuration] The strainer 200 is made of, for example, aluminum and has a cup shape that opens upward when viewed as a whole. The strainer 200 is disposed so as to cover the suction port 160. Specifically, the strainer 200 includes three protrusions 210 and a bottom 220.

[0037] Two openings 221 are formed in the bottom portion 220. Note that three or more openings 221 may be formed in the bottom portion 220.

[0038] The bottom portion 220 includes a first bottom surface 220b seen from below, and a second bottom surface 220c recessed upward from the first bottom surface 220b from the opening 221 to the outer periphery 220ae of the bottom portion 220. Each of the first bottom surface 220b and the second bottom surface 220c extends along an xy plane that intersects with the z axis.

[0039] The bottom 220 further includes a side surface 220d formed at the step between the first bottom surface 220b and the second bottom surface 220c so as to face the central portion 220ac of the bottom 220. Hereinafter, the portion recessed above the first bottom surface 220b due to this step may be referred to as a recess 222.

[0040] By placing the submersible pump 10 in the boiler pit so that the first bottom surface 220b is in contact with the bottom of the boiler pit, 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.

[0041] In the recess 222, two notches 220f are formed on the outer periphery 220ae side of the two openings 221, respectively, cutting toward the center 220ac of the bottom 220. A screw 400 passes through the notch 220f. In this way, by forming the notch 220f in the recess 222 that is recessed one step higher than the second bottom surface 220c, it is possible to prevent the head of the screw 400 from protruding below the first bottom surface 220b, thereby improving the stability of the submersible pump 10 when standing on its own.

[0042] The opposing surface 220a seen from above faces the suction port 160. The bottom 220 has three mounting portions 220ap, each having a mounting surface located above the opposing surface 220a. Two of the three mounting portions 220ap face each other across a central portion 220ac, and have recesses 222 formed below them. The mounting portions 220ap are provided along the outer periphery 220ae of the bottom 220.

[0043] The protruding portions 210 have a shape that protrudes upward from the outer periphery 220ae of the bottom portion 220. The three protruding portions 210 are provided at intervals from one another along the circumferential direction of the bottom portion 220. A mounting portion 220ap is located between two of the protruding portions 210.

[0044] A plurality of slits 211, each having a rectangular opening with its major axis extending in the vertical direction, are formed from the side surface of the strainer 200 to the first bottom surface 220b. The slits 211 form a part of the flow path FP.

[0045] [Wearing 320 Configuration] The wear ring 320 is a substantially disk-shaped member extending along the xy plane. Three openings 320a that form part of the flow path FP are formed in the wear ring 320. The impeller 130 (not shown in FIGS. 3 to 5) is provided below the wear ring 320. The rotating shaft 110 (not shown in FIGS. 3 to 5) fixed to the impeller 130 passes through a hole 320e formed in the center of the wear ring 320.

[0046] Therefore, once the two screws 400 are removed and the wear ring 320 is free to move, it is possible to separate the wear ring 320 from the oil casing 180, but this movement is limited between the oil casing 180 and the impeller 130 due to the presence of the impeller 130. Note that the movement of the wear ring 320 may be limited by its fit with the oil casing 180.

[0047] Two through holes 320f extending in the up-down direction and facing each other with the hole 320e interposed therebetween are formed in the wear ring 320. Two screws 400 are inserted into the two through holes 320f, respectively.

[0048] [Configuration of Suction Cover 330] The suction cover 330 is disposed between the strainer 200 and the pump casing 310 so as to cover the pump casing 310, and has two protrusions 331. Note that the suction cover 330 may have three or more protrusions 331.

[0049] Specifically, suction cover 330 is made of, for example, aluminum and has a cup shape that opens upward. An opening 330e that functions as suction port 160 is formed in the approximate center of bottom surface 330b of suction cover 330 as seen from below.

[0050] The two protrusions 331 protrude from the two openings 221 in the strainer 200, respectively. The two protrusions 331 protrude from the openings 221 along the side surface 220d of the strainer 200. With this configuration, the recess 222 is located on the outer periphery 220ae side of the protrusions 331, so the two protrusions 331 can be exposed so that they can be easily pinched between fingers. This makes it easier to hold the suction cover 330 and the strainer 200 together.

[0051] The two protrusions 331 are formed to face the central portion 220ac of the bottom portion 220 of the strainer 200. With this configuration, for example, when the protrusions 331 are pressed with a finger, a force directed toward the central portion 220ac can be applied to the suction cover 330. Therefore, when the suction cover 330 is removed together with the strainer 200 by hooking a finger on each protrusion 331, the strainer 200 and the suction cover 330 can be removed without rotating them.

[0052] The two protrusions 331 protrude downward from the bottom surface 330b and are formed to face each other. With this configuration, for example, each protrusion 331 can be provided at a position where force can be easily applied when pinching with the thumb and at least one of the index finger, middle finger, and ring finger, thereby improving the ease of gripping the suction cover 330.

[0053] Two through holes 330f extending in the up-down direction are formed in the suction cover 330, positioned between an inner side surface 330c and an outer side surface 330d, facing each other across an opening 330e. Two screws 400 are inserted into the two through holes 330f, respectively.

[0054] A mounting surface 330a of the suction cover 330 seen from above faces the wear ring 320 with the pump casing 310 sandwiched therebetween.

[0055] 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.

[0056] An inner side surface 330c of the suction cover 330 is tapered toward the placement surface 330a (an example of the "bottom") of the suction cover 330.

[0057] [Configuration of pump casing 310] The pump casing 310 has an inlet 160 and forms a pump chamber 150 in which an impeller 130 for drawing water from the inlet 160 is disposed.

[0058] Pump casing 310 is made of an elastic material such as rubber and has a cup shape that opens upward. An opening that is suction port 160 is formed in bottom surface 310b of pump casing 310.

[0059] The pump casing 310 is housed in an internal space surrounded by a wear ring 320 and a suction cover 330. The pump casing 310 and the wear ring 320 form a pump chamber 150. Although not shown in FIG. 5, the pump chamber 150 houses the impeller 130 (see FIG. 2).

[0060] The outer side surface 310d of the pump casing 310 includes three straight surfaces 310s extending in a direction perpendicular to the mounting surface 330a (an example of a "bottom") of the suction cover 330, and three tapered surfaces 310t that taper toward the mounting surface 330a of the suction cover 330. The straight surfaces 310s and the tapered surfaces 310t are alternately provided along the circumferential direction of the pump casing 310.

[0061] [assembly] The pump casing 310 is fitted onto the suction cover 330 from above so that the bottom surface 310b of the pump casing 310 and the mounting surface 330a of the suction cover 330 come into contact with each other.

[0062] 6, inner side surface 330c of suction cover 330 is tapered toward mounting surface 330a of suction cover 330, which allows the size of the opening of suction cover 330 to be larger than the size of bottom surface 310b of pump casing 310, making it easier to insert pump casing 310 into the opening of suction cover 330. Also, inner side surface 330c of the suction cover and outer side surface 310d of pump casing 310 can easily come into contact with each other.

[0063] Furthermore, because the straight surface 310s included in the outer side surface 310d of the pump casing 310 extends in a direction perpendicular to the mounting surface 330a of the suction cover 330, the pump casing 310 and the suction cover 330 can be tightly fitted together below the straight surface 310s. This makes it possible to prevent the pump casing 310 from coming off the suction cover 330 after assembly. Furthermore, the pump casing 310 and the suction cover 330 can be loosely fitted together above the straight surface 310s. This reduces frictional resistance when fitting the pump casing 310 into the suction cover 330 from above, making it easier to assemble them.

[0064] As described above, the tapered surface 310t included in the outer side surface 310d of the pump casing 310 is tapered toward the mounting surface 330a of the suction cover 330. In this embodiment, the tolerance is designed so that there is a slight gap between the inner side surface 330c of the suction cover 330 and the tapered surface 310t. This allows the size of the bottom surface 310b of the pump casing 310 to be smaller than the size of the opening of the suction cover 330, making it easier to insert the pump casing 310 into the opening of the suction cover 330.

[0065] Furthermore, by forming straight surfaces 310s only on a portion of the outer side surface 310d of the pump casing 310, rather than the entire circumference, when fitting the pump casing 310 into the suction cover 330, assembly can be performed by pushing only a portion (three locations in this embodiment) of the pump casing 310 downward, rather than the entire circumference. This simplifies assembly. Furthermore, because the surfaces that require adjustment of the fit dimensions are limited to the three straight surfaces 310s, the amount of work required to modify the mold used when mass-producing the pump casing 310 can be reduced.

[0066] When bottom surface 310b of pump casing 310 and mounting surface 330a of suction cover 330 are in contact, inner side surface 330c of suction cover 330 and outer side surface 310d of pump casing 310 are in contact. With this configuration, when pump casing 310 made of an elastic material such as rubber, which is easily deformed, is fitted into suction cover 330 made of aluminum, which is less likely to deform, pump casing 310 is elastically deformed, and the restoring force of pump casing 310 can increase the adhesion between inner side surface 330c of suction cover 330 and outer side surface 310d of pump casing 310. This allows pump casing 310 to be fixed to suction cover 330 at least to the extent that they will not be separated by gravity.

[0067] The suction cover 330 is connected to the wear ring 320. 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 convex portions protruding in the radial direction and three concave portions located between the convex portions are formed on the outer periphery of the casing unit 140.

[0068] The suction cover 330 is placed on the upper side of the mounting portion 220ap so that the two protrusions 331 on the suction cover 330 are inserted into the two openings 221 on the strainer 200, respectively, and the three convex portions are positioned above the three mounting portions 220ap on the strainer 200.

[0069] At this time, the bottom surface 330b of the suction cover 330 and the mounting surface of the mounting portion 220ap abut against each other. The two protrusions 331 protrude downward from the two openings 221, respectively. However, because the second bottom surface 220c is recessed from the first bottom surface 220b from the openings 221 to the outer periphery 220ae, the vertical position of the lower end of the protrusion 331 can be positioned above the vertical position of the first bottom surface 220b of the strainer 200. This allows the protrusions 331 to protrude from the openings 221 without protruding below the first bottom surface 220b and to be exposed from the strainer 200. Furthermore, for example, the first bottom surface can be placed on the bottom of the water, allowing the submersible pump 10 to stand independently and stably.

[0070] The strainer 200 and the casing unit 140 are integrated together (see FIG. 3). The strainer 200 and the casing unit 140 are fixed to the pump body 100 by threading two screws 400 into the pump body 100 through the notches 220f, the through holes 330f, and the through holes 320f.

[0071] [Separation] First, the two screws 400 are separated from the pump body 100 by loosening each of them.

[0072] For example, the suction cover 330 is grasped by pinching the two protrusions 331 of the suction cover 330 between the thumb and at least one of the index finger, middle finger, and ring finger.

[0073] Then, the suction cover 330 is pulled in the negative direction of the z-axis. Because the bottom surface 330b of the suction cover 330 abuts against the mounting surface of the mounting portion 220ap, the strainer 200 can be reliably separated from the pump body 100 together with the suction cover 330. This makes it easy to remove the strainer 200 and suction cover 330 that cover the pump casing 310.

[0074] Since the inner side surface 330c of the suction cover 330 and the outer side surface 310d of the pump casing 310 abut against each other, the pump casing 310 can be separated from the pump body 100 together with the suction cover 330. This allows the impeller 130 and the pump chamber 150 to be exposed, thereby reducing the time required for maintenance of the impeller 130 and the pump chamber 150.

[0075] For example, the suction cover 330 can be separated from the strainer 200 by holding the strainer 200 with one hand and pressing the protrusion 331 in the + direction of the z axis with the thumb of the other hand.

[0076] For example, the pump casing 310 can be separated from the suction cover 330 by holding the suction cover 330 with one hand and pulling out the pump casing 310 in the +z-axis direction with the other hand.

[0077] [Variations] The thickness of the protrusion 331 of the suction cover 330 is thicker than the thickness of other parts of the suction cover 330. With this configuration, for example, the lower end of the protrusion 331 can be easily pushed upward with the thumb, making it easier to separate the suction cover 330 and the strainer 200.

[0078] The protrusions 331 of the suction cover 330 include recesses recessed toward the center 220ac of the bottom 220 of the strainer 200. With this configuration, for example, when pinching the two protrusions 331 of the suction cover 330 between the thumb and at least one of the index finger, middle finger, and ring finger, the pads of the fingers can be hooked in the recesses. This makes it easier to grip the suction cover 330, and prevents the fingers from slipping when pinching the two protrusions 331 and applying force in the z-axis direction.

[0079] An inner side surface 330c of suction cover 330 and an outer side surface 310d of pump casing 310 are each provided with mating projections and recesses. With this configuration, when strainer 200 is separated from pump body 100 together with suction cover 330 by pinching projections 331 with fingers and applying force in the z-axis direction, pump casing 310 can also be more reliably separated from pump body 100.

[0080] 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]

[0081] 10...Submersible pump, 100...Pump body, 110...Rotating shaft, 120...Motor, 130...Impeller, 140...Casing unit, 150...Pump chamber, 160...Suction port, 170...Discharge port, 180...Oil casing, 200...Strainer, 210...Protrusion, 211...Slit, 220...Bottom, 220a...Opposite surface, 220ac...Central portion, 220ae...Outer periphery, 220ap...Placement portion, 220b...First bottom surface, 220c...Second bottom surface, 220d...Side, 220f...Notch portion , 220g...space, 221...opening, 222...recess, 310...pump casing, 310b...bottom surface, 310d...outer side surface, 310s...straight surface, 310t...tapered surface, 320...wear ring, 320a...opening, 320e...hole, 320f...through hole, 330...suction cover, 330a...mounting surface, 330b...bottom surface, 330c...inner side surface, 330d...outer side surface, 330e...opening, 330f...through hole, 331...projection, 400...screw, FP...flow path

Claims

1. a pump casing having a suction port and forming a pump chamber in which an impeller for sucking water from the suction port is disposed; a strainer having a bottom portion with at least two openings formed therein and disposed to cover the suction port; a suction cover disposed between the strainer and the pump casing so as to cover the pump casing, the suction cover having at least two protrusions protruding from the at least two openings, respectively; Submersible pump.

2. The bottom of the strainer includes a first bottom surface and a second bottom surface recessed from the first bottom surface to the outer periphery.

2. The submersible pump of claim 1.

3. The bottom of the strainer further includes a side surface formed to face a central portion at a step between the first bottom surface and the second bottom surface.

3. The submersible pump of claim 2.

4. The protrusion of the suction cover protrudes from the opening along the side surface of the strainer.

4. The submersible pump according to claim 3.

5. At least two of the protrusions of the suction cover are formed to face the center of the bottom of the strainer.

2. The submersible pump of claim 1.

6. At least two of the protrusions of the suction cover are formed to face each other.

2. The submersible pump of claim 1.

7. The thickness of the protrusion of the suction cover is greater than the thickness of the other portion of the suction cover.

2. The submersible pump of claim 1.

8. The protrusion of the suction cover includes a recess recessed toward the center of the bottom of the strainer.

2. The submersible pump of claim 1.

9. each of the suction cover and the pump casing has a cup shape; The inner side surface of the suction cover and the outer side surface of the pump casing are in contact with each other.

2. The submersible pump of claim 1.

10. a portion of the outer side surface of the pump casing extends in a direction perpendicular to a bottom portion of the suction cover; The inner side surface of the suction cover is tapered toward the bottom of the suction cover.

10. The submersible pump of claim 9.

11. each of the suction cover and the pump casing has a cup shape; The inner side surface of the suction cover and the outer side surface of the pump casing are respectively provided with mating concave and convex portions.

2. The submersible pump of claim 1.

12. the strainer, the pump casing, and the suction cover are separable from one another; The strainer and the suction cover are fixed to the pump body by two screws provided on either side of the center of the bottom of the strainer, with the suction cover covering the pump casing.

2. The submersible pump of claim 1.

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