JP2009243445A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device provided with a built-in strainer which is easily replaceable and can prevent breakage. <P>SOLUTION: The pump device 1 is provided with a pump casing 30 for covering an impeller 20 provided with a suction port 32 and connected with a motor 10 via a rotary shaft 12, a joint member 60 provided for the pump casing 30, a strainer 70 arranged between the suction port 32 and the joint member 60 and a fixing tool 80 for fixing the joint member 60 to the pump casing 30. A bearing part 48 for holding the rotary shaft 12 and a plurality of ribs 47 for continuously connecting this bearing part 48 and the suction port 32 are structured to be capable of holding the strainer 70 by a bearing rib 34 formed at the suction port 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pump device having a built-in strainer, and more particularly, to a device in which the strainer can be easily replaced.

  Currently, various pumps are used to supply (pump) water. As one of such pumps, for example, a land-use spiral pump in which an impeller is directly connected to a rotating shaft of a motor is known.

  In such a pump, a strainer is provided in a pipe connected to the suction port, a water source, or the like, so that filtration is performed so that solid particles such as foreign matter are not mixed in the water to be supplied and the pump. However, when a strainer is provided in a pipe or a water source, a separate strainer is required, and the strainer installation and manufacturing costs increase.

  In addition, when a strainer is provided in a pipe or a water source, there are cases where the installation is restricted due to the shape of the pipe or the water source or the surrounding conditions, and it is difficult to attach the strainer.

  For this reason, there is known a pump apparatus in which a disk-shaped filter member (strainer) provided in a suction passage that penetrates a drive shaft and communicates a reservoir and a pump portion is disposed in a pump chamber formed in a housing. (For example, refer to cited document 1).

By incorporating such a filter member in the pump device, it is not necessary to provide a strainer outside the pump device (pipe, water source, etc.), and the pump device can be downsized.
JP 2006-138285 A

  The pump device as described above has the following problems. That is, even if the pump device can be miniaturized, when a disc-shaped strainer through which the drive shaft passes is used, the pump device must be disassembled and the strainer must be taken out during maintenance inspection. That is, when the strainer is replaced, the replacement work becomes complicated and the workability is poor. In particular, when the liquid flowing through the strainer has a lot of solid particles, the strainer is likely to be clogged and needs to be replaced, and water cannot be supplied during that time.

  In addition, since the strainer is provided inside the pump device, it is difficult to confirm the clogging of the strainer, and the strainer clogging increases the pressure on the primary side of the strainer and may cause the strainer to be damaged. If the strainer breaks, solid particles filtered by the strainer may flow into the pump, damaging the pump, and there is a risk that the solid particles may enter the supplied liquid. There is also a risk.

  Therefore, the present invention relates to a pump device incorporating a strainer, and in particular, an object of the present invention is to provide a strainer that can be easily replaced and can prevent the strainer from being damaged.

  In order to solve the above problems and achieve the object, the pump device of the present invention is configured as follows.

  An impeller connected to the rotating shaft of the motor; a pump casing that covers the rotating shaft and the impeller and has a suction port located on an extension of the rotating shaft; and an outer surface side of the suction port of the pump casing. A suction flange having a cylindrical portion having an inner diameter larger than the inner diameter of the suction port, and forming an annular strainer seating surface around the suction port; and detachably provided in the suction port The suction port side end portion is opened, the end portion positioned in the pump casing is closed, and the filtration portion is formed integrally with the suction port side end portion, A strainer having an outer diameter smaller than the outer diameter of the strainer seat surface and having an edge portion having a diameter larger than that of the suction port, and the edge portion abutting against the strainer seat surface; In front of the suction flange Characterized in that it comprises a joint member having an insertion portion inserted into the cylindrical portion.

  According to the present invention, even in a pump device incorporating a strainer, the strainer can be easily replaced and the strainer can be prevented from being damaged.

  FIG. 1 is a side view showing a partial cutout of a pump device 1 according to an embodiment of the present invention, FIG. 2 is a front view showing the configuration of the pump device 1, and FIG. 3 is a pump casing used in the pump device 1. FIG. 4 is a front view showing the configuration of the pump casing 30, FIG. 5 is a rear view showing the configuration of the pump casing 30, and FIG. 6 shows the use of the strainer 70 used in the pump device 1. FIG. 7 is a cross-sectional view showing an example of use of the strainer 70. In FIG. 1, B indicates a bolt, C indicates a solid particle, F indicates a flow direction of water, and S indicates a screw member.

  As shown in FIGS. 1 and 2, the pump device 1 includes a motor 10, an impeller 20 connected to a rotating shaft 12 connected to the motor 10, and a screw member S connected to the motor 10 to cover the impeller 20. And a pump casing 30 having a suction port 32. The pump device 1 also fixes the joint member 60 provided to the pump casing 30, the strainer 70 provided between the suction port 32 of the pump casing 30 and the joint member 60, and the pump casing 30. And a fixing tool 80.

  The motor 10 includes a case portion 11 provided outside the motor 10 and a rotating shaft 12 (indicated by a chain line in FIG. 1) that rotates when the motor 10 is operated. The case portion 11 includes a fixing portion 13 provided below the case portion 11 for fixing to the installation surface, and a screwing portion 14 into which the screw member S for fixing the pump casing 30 is screwed.

  The impeller 20 is fixed to the rotating shaft 12 of the motor 10 and is formed to be able to rotate following the rotation of the rotating shaft 12. The impeller 20 includes a pair of shrouds 22 having an annular suction portion 21 projecting outward around one rotation center, and blades 23 formed between the shrouds 22.

  That is, the impeller 20 is formed so as to be able to suck water from the suction portion 21 on the rotation center side and to increase the pressure of the water by the blades 23 and to discharge water from the peripheral portion of the shroud 22 by rotating. If the impeller 20 can increase the pressure of water, the shape, configuration, and quantity of the impeller 20 can be appropriately set depending on the performance of the pump device 1 and the like. Further, the impeller 20 may be integrally formed of resin or the like, or may be formed by combining a pair of shrouds provided with blades on one side. Moreover, the fixing method to the rotating shaft 12 of the impeller 20 can be suitably set, such as a key and a pin.

  As shown in FIGS. 1 to 5, the pump casing 30 includes a dish-shaped case part 31 with one end face opened and a suction provided on the other end face (positioned on the right side face in FIG. 3) of the case part 31. A mouth 32 and a discharge port 33 provided on the outer peripheral surface of the case portion 31 are provided. Further, the pump casing 30 has a seat rib (strainer seat surface) having a bearing rib 34 projecting on the side facing the end surface of the suction port 32 and a seat surface on which a strainer 70 described later contacts the suction port 32. ) 35, a suction flange 38 having a flange portion 37 at the end of a cylindrical portion 38 a formed continuously with the case portion 31, and a discharge flange 39 provided at the discharge port 33. ing. The flange portion 37 of the suction flange 38 is formed so as to be able to contact the joint member 60.

  The pump casing 30 is provided on the inner surface side of the case portion 31 and around the suction port 32, and is provided on the inner surface side of the case portion 31. The impeller 20 is provided on the inner surface side of the housing portion 40 that houses a part of the suction portion 21 of the impeller 20. And an impeller chamber 41 for storing the housing.

  The pump casing 30 includes a plurality of externally provided reinforcing ribs 42, a plurality of screw through holes 43 through which the screw member S is passed for connection to the motor 10 via the screw member S, and a diameter of the suction flange 38. And a convex portion 44 protruding in the direction. The pump casing 30 includes a screw hole 45 that can drain water in the pump casing 30 outside the case portion 31. Note that a drainage bolt B is screwed into the screw hole 45. By removing the bolt B, the pump casing 30 can be drained. The pump casing 30 is formed by integrally molding each component with a resin material or the like, and necessary processing such as chamfering or screw cutting is formed by additional processing.

  The bearing rib 34 is formed on a plurality of, for example, three ribs 47 extending from the suction port 32, and an extension of the rib 47, and the bearing portion is formed so as to hold and rotate and slide the end of the rotating shaft 12. 48. The ribs 47 are formed such that the adjacent intervals are arranged at equal intervals, and the distances facing each other toward the bearing portion 48 are close to each other.

  The distance between the ribs 47 facing each other is formed to be substantially the same as or slightly larger than the outer diameter of the strainer 70. That is, the strainer 70 is inserted between the ribs 47, and the ribs 47 are held or arranged with a minute gap.

  The bearing portion 48 is cylindrical and is provided on the other side of the side integrally connected to the rib 47 and has an insertion portion 49 into which the end of the rotating shaft 12 is inserted. The bearing portion 48 is a side that is integrally connected to the ribs 47, and contacts the center of the arrangement of the plurality of ribs 47 when the strainer 70 is deformed, thereby restricting deformation of the strainer 70. A contact portion 50 is formed.

  The diameter of the inner peripheral surface 51 of the impeller chamber 41 is formed by an involute curve shape in which, for example, a part of the extension of the discharge port 33 starts from a diameter substantially the same as the outer diameter of the impeller 20. That is, the inner peripheral surface 51 of the impeller chamber 41 is rotated from a part on the extension of the discharge port 33 by 360 ° (rotated clockwise in FIG. 5) until returning to a part on the extension of the discharge port 33. The diameter is gradually increased. As a result, the gap between the inner peripheral surface of the impeller chamber 41 and the peripheral edge of the impeller 20 gradually spreads from the extension of the discharge port 33 and becomes the maximum on the extension of the discharge port 33, thereby efficiently discharging water. It is formed to flow to the outlet 33.

  The joint member 60 is provided with a screw hole 61 to which piping or the like can be connected, an insertion portion 62 inserted into the inner peripheral surface of the suction flange 38, and an inner peripheral surface of the insertion portion 62 and the suction flange 38. And an O-ring 63 that seals. The joint member 60 includes a flange portion 64 that abuts on the flange portion 37 of the suction flange 38 and a fixing portion 65 provided on the flange portion 64.

  The strainer 70 is formed of, for example, a net-like member, abuts against the seat portion 35, and is held or pressed and held between the seat portion 35 and the end surface of the insertion portion 62, and a bearing is formed from the edge portion 71. The filter part 72 which protrudes in the rib 34 side is provided. The edge portion 71 has an inner diameter that is substantially the same as or smaller than the suction port 32, and an outer diameter that is smaller than that of the seat portion 35.

  The outer diameter of the filtration part 72 is smaller than the inner diameter of the suction port 32, one end is opened, the other end is closed, and the suction part 32 can be inserted into the bearing part 48. It is formed into a shape. Specifically, the filtration part 72 is formed in, for example, a triangular pyramid (the cross section is substantially triangular) and has a rounded tip, and is disposed between the ribs 47 in the pump casing 30. In addition, as long as the outer diameter of the connection part with the edge 71 of the filtration part 72 is formed smaller than the suction inlet 32, the filtration part 72 may be a semispherical body (a cross section is a semicircle).

  That is, the strainer 70 is formed so that the filtering part 72 can be inserted into the suction port 32, and the suction port 32 is covered with the edge part 71 and the filtering part 72 by the seat part 35 and the edge part 71 coming into contact with each other at the time of insertion. At the same time, the filtration part 72 can be disposed in the pump casing 30. The strainer 70 is held by the rib 47 or spaced apart from the rib 47 with a minute gap when the outer surface of the filtration portion 72 is in contact with or close to the rib 47.

  The fixture 80 is made of a metal material having elasticity, for example, a stainless material. The fixture 80 is provided in the arc portion 81 having a slightly smaller diameter than the flange portions 37 and 64 of the suction flange 38 and the joint member 60 and in the middle of the arc portion 81, and is substantially the same as the outer shape of the convex portion 44 and the fixing portion 65. A lock portion 82 having the same shape and an end portion 83 provided at the tip of the arc portion 81 are provided. The fixture 80 is provided on a partial side surface of the arc portion 81 and the end portion 83, and has an insertion hole 84 that can restrict movement in the axial direction by inserting each flange portion 37, 64. Yes.

  In the pump device 1 configured as described above, when the rotating shaft 12 is rotated by the motor 10, the impeller 20 connected and fixed to the rotating shaft 12 rotates following the rotating shaft 12. When the impeller 20 rotates, the water inside the impeller 20 is pressurized by the blades 23 and sent downstream. At this time, as shown in the flow direction F of water, the pressure of water is increased inside the impeller 20, water is discharged from the periphery of the impeller 20, and water is sent to the discharge port 33.

  When the water inside the impeller 20 is increased in this way and the water is sent downstream, the water pressure is reduced at the suction portion 21 of the impeller 20, so that water is sucked from the suction port 32. The water sucked from the suction port 32 passes through the filtration part 72 of the strainer 70, passes through the ribs 47, and water is sucked from the suction part 21 of the impeller 20. By repeating this, the pump device 1 pumps up the water.

  As shown in FIG. 6, when the pumped water 1 contains contaminants (hereinafter “solid particles”) C such as metal pieces and dust in the sucked water, the water passes through the filtration unit 72 of the strainer 70. During the passage, the solid particles C are filtered by the filtering unit 72. Thus, during operation of the pump device 1, the filtering unit 72 prevents the solid particles C from entering the pump casing 30 by filtering the solid particles C.

  Here, when the solid particles C filtered by the filtering unit 72 accumulate more than a certain amount, the filtering unit 72 is clogged. When clogging occurs in the filtration unit 72, the flow channel area when water passes through the filtration unit 72 is reduced, thereby increasing the flow channel resistance, and the water pressure on the primary side (upstream side) of the filtration unit 72 is increased. Will increase.

  When the water pressure on the primary side of the filtration part 72 increases in this way, the water pressure on the secondary side of the filtration part 72 with a small flow path area decreases, so the filtration part 72 moves to the secondary side, that is, the bearing part 48 side. It will be pressed by water pressure. Stress is applied to the filtration part 72 of the strainer 70 by water pressure, and the strainer 70 is deformed.

  Here, the deformation | transformation of the strainer 70 is demonstrated using FIG. 6, FIG.

  As shown in FIG. 6, first, when the pump device 1 is under a normal operation or the stress applied to the filtration unit 72 due to the clogging of the solid particles C is lower than the allowable stress of the strainer 70. In this case, the strainer 70 maintains the shape as it is or changes in shape due to elastic deformation. That is, when the filtration part 72 of the strainer 70 maintains the shape as it is, or when the shape is changed due to elastic deformation, the filtration part 72 is not in contact with the rib 47 or the contact part 50 or is partly in point contact. It becomes.

  From this state, when the water pressure on the primary side of the filtration unit 72 increases (further increases) due to the clogging of the filtration unit 72, the stress applied to the filtration unit 72 by the water pressure also increases. Here, when the primary side of the filtration part 72 is increased to a certain level of water pressure, permanent strain is generated in the strainer 70, that is, the strainer 70 is plastically deformed by a stress exceeding the allowable stress. At this time, as shown in FIG. 7, the filtering portion 72 of the strainer 70 plastically deformed more than a certain amount is abutted and held by the rib 47 and / or the abutting portion 50, i.e., the rib 47 and / or the abutting portion 50. A part of the filtration part 72 is in surface contact. By this surface contact, the filtration part 72 is held by the rib 47 and / or the contact part 50, and the stress (water pressure) is distributed to the rib 47 and the contact part 50, and the plastic deformation of the filtration part 72 stops. In addition, the filtration part 72 is prevented from being broken.

  Note that when the suction flange 38 and the joint member 60 are connected, the suction flange 38 and the joint member 60 first abut each flange portion 37, 64 to be fixed. Next, the arc portion 81 is elastically deformed to the outer peripheral side by applying an outward force to the end portion 83 of the fixture 80. In this state, the flange portion 64 is inserted into the insertion hole 84, and one of the convex portion 44 and the fixing portion 65 is disposed in the lock portion 82 to remove the force applied to the arc portion 81. The arc portion 81 returns to the closing direction due to the elastic force. As a result, the flange portions 37 and 64 are inserted into the insertion hole 84, the roots of the flange portions 37 and 64 are pressed by the arc portion 81, the movement of the flange portions 37 and 61 is restricted, and the suction flange 38 is controlled. The joint member 60 is fixed to the joint. When the joint member 60 is detached, it is only necessary to apply an outward force to the end portion 83 to elastically deform the arc portion 81 and to remove the fixture 80 from the flange portions 37 and 64.

  Moreover, even if the joint member 60 is connected to the suction flange 38 as described above, the state of the strainer 70 (the clogged state of the filtration portion 72) is shown in FIG. 2 simply by removing the pipe connected to the joint member 60. Thus, the state of the strainer 70 can be visually confirmed from the outside.

  According to the pump device 1 configured as described above, the strainer 70 is inserted into the suction port 32 and the edge portion 71 is pressed by the insertion portion 62, so that the edge portion 71 is held by the seat portion 35 and the insertion portion 62. As a result, the strainer 70 can be fixed. It should be noted that there is no problem even if the pressing force of the edge portion 71 by the insertion portion 62 slightly decreases due to a dimensional error or the like, and the edge portion 71 of the strainer 70 is pressed against the seat portion 35 by water pressure even if they are separated from each other. It does not decrease the filtration function.

  Also, since the joint member 60 can be attached to and detached from the suction flange 38 only by attaching and detaching the fixture 80, the strainer 70 can be replaced by removing the joint member 60 and inserting the strainer 70 into the suction port 32 again. It is only necessary to attach 60 with the fixture 80. Also, the state of the strainer 70 can be confirmed by simply removing the pipe from the joint member 60 and visually confirming it.

  In particular, the strainer 70 used in such a pump device 1 should be replaced frequently depending on the operating conditions such as the operating time of the pump device 1 and the use conditions such as when connecting between water supplies or using well water. There are also many. Further, the strainer 70 may be clogged frequently depending on use conditions and operating conditions, and a worker who performs maintenance on the pump device 1 performs maintenance on a plurality of pump devices 1 per day. Sometimes.

  For this reason, by making it easy to check and replace the strainer 70, workability can be improved, and the replacement work time of the strainer 70 can be reduced. Further, instead of replacing the strainer 70 only during the operation period of the determined pump device 1, it is possible to periodically check the strainer 70 and replace the strainer 70 when necessary. Thereby, the maintainability of the pump apparatus 1 will be improved.

  In addition, by allowing the plastic deformation of the filtration portion 72 due to clogging of the strainer 70 to be held by the rib 47 and the contact portion 50 of the bearing rib 34, it becomes possible to prevent plastic deformation above a certain level. When the strainer 70 progresses more than a certain amount of such plastic deformation, it will cause the strainer 70 to break (break). Here, as a breakage point of the strainer 70, breakage of the filtration part 72, breakage of the connection part of the edge part 71 and the filtration part 72, etc. can be considered. When the strainer 70 is broken, there is a possibility that the solid particles C attached to the filtration unit 72 may move (inflow) downstream, or the filtration function of the filtration unit 72 may be reduced (disappeared).

  For this reason, when the solid particles C are not filtered by the strainer 70, the solid particles C may flow into the pump casing 30 and enter the sliding portions such as the impeller 20 and the rotary shaft 12, or the water supply There is a possibility that the water to be contained contains the solid particles C.

  If the solid particles C enter the sliding portion such as the impeller 20, the sliding portion may become tangled (bite) by the solid particles C, and the sliding resistance may increase or the sliding portion may be seized. . In addition, there is a risk of overloading the motor 10 due to the winding. Due to such an increase in sliding resistance, there is a risk that the operating efficiency of the pump device 1 may be reduced or a failure may occur. In addition, the solid particles C may enter the sliding portion, and the surface of the sliding portion may be damaged, and the pump function (pumping function or pressure increasing function) may be deteriorated due to water leakage from the sliding portion. There is.

  Moreover, when the solid particle | grains C are contained in the water supplied, when the pump apparatus 1 is used for supply of drinking water, there exists a possibility that the solid particle | grains C may invade into a human body. Further, in the case of water used for cleaning, there is a possibility that the cleaning object may be damaged by the solid particles C. That is, there is a risk of reducing the safety of the supplied water.

  For this reason, by preventing the strainer 70 from being broken by the bearing ribs 34, it is possible to prevent the pump function of the pump device 1 from being lowered and the pump device 1 from being broken. Moreover, it becomes possible to improve the safety of the supplied water. That is, the reliability of the pump device 1 can be improved.

  As described above, according to the pump device 1 according to the present embodiment, the strainer 70 is inserted into the suction port 32 and pressed by the insertion portion 62, and the suction flange 38 and the joint member 60 are fixed by the fixture 80. Only by this, the strainer 70 can be held. Thereby, the strainer 70 can be easily attached and detached, the workability of replacing the strainer 70 is improved, and the maintainability of the pump device 1 can be improved.

  Further, the filtering portion 72 of the strainer 70 can be held by the rib 47 of the bearing rib 34 and the contact portion 50 so that the filtering portion 72 plastically deformed due to an increase in water pressure due to clogging of the filtering portion 72 or the like. Thereby, it becomes possible to prevent the filtration part 72 from being damaged, and by reliably filtering the solid particles C, the reliability of the pump device 1 can be improved.

  The present invention is not limited to the above embodiment. For example, three ribs 47 are provided, but can be set as appropriate if three or more ribs 47 are arranged at equal intervals. It should be noted that the number of ribs 47 may be a number that does not increase the flow path resistance, for example, about 3-6. That is, as the number of ribs 47 increases, the flow path area of water between the ribs 47 decreases, and the flow path resistance increases. That's fine.

  Further, the shape of the bearing rib 34 can be appropriately changed depending on the combination of the rotating shaft 12 and the bearing portion 48 or the combination of the suction port 32 and the rib 47. For example, a hole may be provided in the rib 47 so as to increase the flow area, and the bearing rib 34 is formed separately from the rib 47 and the bearing 48, and the bearing is fitted to the end of the rib. It may be configured to be attached with a bolt or a bolt. Further, the suction flange 38 and the joint member 60 may not be assembled with the fixture 80. For example, a configuration in which the joint member 60 can be screwed into the suction flange 38 by forming a female screw in the inner diameter portion of the suction flange 38 and forming a male screw in the insertion portion 62 of the joint member 60 may be adopted. Moreover, the structure which assembles the suction flange 38 and the coupling member 60 with a volt | bolt etc. may be sufficient. In addition, although the pump casing 30 is formed of a resin material, the pump casing 30 may be formed of a metal material. In addition, various modifications can be made without departing from the scope of the present invention.

The side view which shows the partial notch of the pump apparatus in connection with one embodiment of this invention. The front view which shows the structure of the pump apparatus. Sectional drawing which shows the structure of the pump casing used for the pump apparatus. The front view which shows the structure of the pump casing. The rear view which shows the structure of the pump casing. Sectional drawing which shows an example of use of the strainer used for the pump apparatus. Sectional drawing which shows an example of use of the strainer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 10 ... Motor, 11 ... Case part, 12 ... Rotating shaft, 13 ... Fixed part, 14 ... Screwing part, 20 ... Impeller, 21 ... Suction part, 22 ... Shroud, 23 ... Blade | wing, 30 ... Pump Casing, 31 ... Case portion, 32 ... Suction port, 33 ... Discharge port, 34 ... Bearing rib, 35 ... Seat portion (straining surface for strainer), 37,64 ... Flange portion, 37.61 ... Flange portion, 38 ... Suction Flange, 39 ... discharge flange, 40 ... storage portion, 41 ... impeller chamber, 42 ... reinforcing rib, 43 ... screw through hole, 44 ... convex portion, 45 ... screw hole, 47 ... rib, 48 ... bearing portion, 49 ... insertion 50, abutment portion, 51 ... inner peripheral surface, 60 ... joint member, 61 ... screw hole, 62 ... insertion portion, 63 ... O-ring, 65 ... fixing portion, 70 ... strainer, 71 ... edge, 72 ... Filtration part, 80 ... Fixing tool, 81 ... Arc part, 82 ... B Click section, 83 ... end 84 ... insertion hole, B ... bolt, C ... contamination (solid particles), F ... Water flow direction, S ... screw member.

Claims (6)

An impeller connected to the rotating shaft of the motor;
A pump casing that covers the rotating shaft and the impeller and has a suction port located on an extension of the rotating shaft;
The pump casing has a cylindrical portion continuously provided on the outer surface side of the suction port, the inner diameter of which is larger than the inner diameter of the suction port, and an annular strainer seating surface is formed around the suction port. A suction flange;
A filtration part that is detachably provided in the suction port, an end part on the suction port side is open, and an end part located in the pump casing is closed, and an end part on the suction port side of the filtration part And the outer diameter is smaller than the outer diameter of the strainer seat surface, and has an edge that is larger in diameter than the suction port, and the edge portion is formed on the strainer seat surface. A strainer that abuts,
And a coupling member having an insertion portion that is inserted into the cylindrical portion of the suction flange. A bearing portion that is provided on the motor side of the suction port of the pump casing and supports the end portion of the rotary shaft, and a plurality that extends in a direction away from the bearing portion toward the suction port. A bearing rib having a rib of
2. The pump device according to claim 1, wherein at least a part of an outer surface of the filtration unit is adjacent to or abuts on the plurality of ribs.   The pump device according to claim 2, wherein the bearing rib has three or more ribs at equal intervals in a circumferential direction of the bearing.   The pump device according to claim 2, wherein the pump casing and the bearing rib are integrally formed of a resin material or a metal material.   2. The pump device according to claim 1, wherein the strainer is held by the edge portion by the seat surface and the end surface of the insertion portion. The joint member has a joint flange adjacent to the suction flange;
The pump device according to claim 6, further comprising: a stopper that restricts movement of the suction flange and the joint flange in directions opposite to each other.

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