JP2010116788A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent locking of an impeller caused by foreign matters intruding into a pump chamber, and to facilitate maintenance without requiring dismantlement. <P>SOLUTION: A slit 17 is provided in a suction port 10 to the pump chamber, and a foreign matter collecting member 80 including an attachment part 81 and a filter part 85 is fitted in. The attachment part 18 has a semicircular profile having an outside diameter equal to a small diameter part of the suction port, and a radial width equal to a thickness of the small diameter part, and the filter part is formed by a plurality of circular rings 86 crossing a through-hole 11 of the suction port. The slit part is covered by a suction hose inserted into the suction port. The foreign matters mixed into sucked water are collected by the filter part before flowing into the pump chamber 2, and do not reach an impeller in the pump chamber, and are not accumulated in the pump chamber. Extensive dismantling such as separation of an upper body 3 and a lower body 4 can be dispensed for removing the foreign matters or replacing the foreign matter collecting member 80. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pump device that sucks liquid from a suction port by rotating an impeller or the like and discharges the liquid from a discharge port.

As a conventional pump device, for example, there is a water pump used for washing water circulation in a washing machine.
This is to suck in the water discharged from the washing tub and return it to the washing tub again, but the water discharged from the washing tub contains lint and other foreign matter. There arises a problem that it is caught around and causes a failure such as an impeller lock.
Therefore, for example, in Japanese Patent Application Laid-Open No. 2008-121430, a foreign matter collecting flow path is provided along the vortex chamber flowing direction on the outer peripheral side of the vortex chamber formed on the outer peripheral side of the impeller chamber. Water pumps have been proposed that are arranged to prevent foreign matter.
JP 2008-121430 A

However, in the above conventional countermeasure technology, the foreign matter collecting flow path and the foreign matter filtering net are arranged inside the pump chamber where the impeller is installed. Therefore, the foreign matter does not necessarily touch the impeller. There is no risk of locking.
Further, when the amount of foreign matter accumulated in the foreign matter collecting flow path increases, the flow path becomes clogged and the function as a foreign matter countermeasure cannot be performed.
And since the foreign material collection flow path is inside the pump chamber, it cannot be directly accessed from the outside, and in order to remove the accumulated foreign material, a large-scale disassembly of the water pump itself is required.

  Therefore, in view of the above problems, the present invention provides a pump device that collects foreign matter so that the foreign matter does not flow into the pump chamber, and can easily perform a function holding operation without requiring disassembly. The purpose is to provide.

  For this reason, the present invention provides a pump device having a pump chamber, a suction port for sucking liquid into the pump chamber, and a discharge port for discharging liquid from the pump chamber, and the suction port is provided with a slit extending from the hole to the outer periphery, It was assumed that a foreign material capturing member having a filter portion was inserted into the slit, and the filter portion of the foreign material capturing member crossed the hole of the suction port.

The slit is preferably formed partway in the radial direction in a direction perpendicular to the axis of the suction port, and the foreign matter catching member has an engaging portion that engages with the bottom wall of the slit.
In particular, the foreign material capturing member has an outer shape of a semicircular arc whose upper half has the same outer diameter as that of the portion where the slit of the suction port is formed, and the lower half has the same inner diameter as the hole of the suction port. It is desirable to have a front shape that fits within a semicircular arc of a circle having an outer diameter, and the step portion between the upper half and the lower half constitutes the engagement portion.

  The filter part of the foreign material capturing member is formed by connecting a plurality of circular rings concentric with the axial center of the hole of the suction port by a connecting portion in the radial direction, and the outer peripheral circular ring and the inner wall of the hole of the suction port It can be set to provide a gap between them.

  As the slit formation position, when the outer periphery of the suction port has a plurality of large diameter portions and a small diameter portion sandwiched between the large diameter portions, the slit is formed on the small diameter portion and on both sides of the small diameter portion. The suction hose externally inserted into the suction port over the large diameter part can seal the slit and the foreign matter capturing member from the outside, or it can be formed on the large diameter part provided on the tip side of the suction port, The slit and the foreign matter catching member may be sealed from the outside by a suction hose that is externally inserted into the suction port beyond the diameter portion.

According to the present invention, the foreign matter mixed in the liquid sucked into the pump chamber through the suction port is captured before flowing into the pump chamber by the filter portion of the foreign matter capturing member crossing the through hole. Accordingly, foreign matter does not reach the impeller, for example, in the pump chamber, and does not accumulate in the pump chamber.
In addition, since the foreign material capture member is attached to the suction port outside the pump chamber, there is no need to perform extensive disassembly for removing foreign material captured by the filter unit or replacing the foreign material capture member, and maintenance is also simple. It can be carried out.

Next, embodiments of the present invention will be described in detail with reference to examples.
FIGS. 1A and 1B show the appearance of a first embodiment applied to a water pump for washing machine circulation. FIG. 1A is a perspective view and FIG. 1B is a top view. 2 is a cross-sectional view taken along the line AA in FIG.
The water pump 1 includes an upper body 3, a lower body 4, and a motor unit 5 that form a pump chamber 2.
The upper body 3 made of resin has a substantially rectangular outer shape, and is provided with a suction port 10 and a discharge port 20 extending outward from the front end wall 3a thereof, and an introduction path 35 connected to the suction port 10 inside. And an upper discharge passage 37 (described later) connected to the discharge port 20 is formed.
The suction port 10 and the discharge port 20 are parallel to each other and parallel to the upper surface of the upper body 3.
The resin-made lower body 4 has a substantially rectangular outer shape corresponding to the upper body 3, and has an impeller chamber 45 for accommodating the impeller H and a lower discharge passage 46 formed therein.

In particular, as shown in FIG. 2, the motor unit 5 includes a stator 52 disposed in a resin motor case 51 and a rotor 60 that is surrounded by the stator 52 and rotates.
The stator 52 includes a stator core 52a made of an annular laminated core, and a drive coil 52b wound around the stator core 52a.
The lower body 4 includes a lower body main body 41 and a cylindrical portion 42 extending from the bottom wall 4c. The cylindrical portion 42 is arranged to be inserted inside the stator 52. The stator 52 has an inner periphery of the stator core 52a. The side is fixed in contact with the outer peripheral surface of the cylindrical portion 42. Further, the bottom wall 4c and the cylinder part 42 of the lower body 4 function as a partition wall that partitions the motor part 5 (stator 52) and the pump chamber 2 in a watertight manner.
The bottom wall of the cylinder part 42 is provided with a boss part 43 protruding inward of the cylinder part, and a motor shaft 53 is supported on the lower end of the boss part 43 and extends upward. A rotor 60 is rotatably supported on the motor shaft 53 via a bearing 54.

The rotor 60 is made of resin, and includes a rotor forming portion 61 positioned in the cylindrical portion 42 and an impeller unit portion 65 that extends upward from the rotor forming portion 61 and forms an impeller H positioned in the lower body main body portion 41. Have.
A magnet 62 is attached to the outer peripheral surface of the rotor forming portion 61 so as to face the stator 52 across the side wall of the cylindrical portion 42, and a bearing 54 is attached to the inner peripheral surface of the rotor forming portion 61. Yes.
The upper end of the motor shaft 53 is inserted into and supported by a receiving recess 34 provided at the lower end of a shaft support column 33 extending from the upper body 3 into the lower body 4. That is, the motor shaft 53 is supported by the receiving concave portion 34 and the boss portion 43 to constitute a fixed shaft.
The rotor forming portion 61 to which the magnet 62 is attached and the stator 52 form a motor M that drives the impeller H.

The impeller unit portion 65 forms an impeller H by providing blades 68 between two upper and lower disk-shaped discs 66 and 67 arranged coaxially with the motor shaft 53.
An annular upper tube portion 70 extends upward from the inner edge of the upper disk 66 to the vicinity of the mating surface of the upper body 3 and the lower body 4. An annular lower cylindrical portion 71 extending downward from the inner diameter edge of the lower disk 67 is connected to the rotor forming portion 61.
The upper cylinder part 70 and the lower cylinder part 71 have the same inner diameter, and a predetermined gap is provided between the upper cylinder part 70 and the lower cylinder part 71.
A metal plate separator 7 and a sealing elastic sheet 8 are overlapped on the mating surface of the upper body 3 and the lower body 4 to partition the pump chamber 2 vertically. By fixing the body 3 and the lower body 4, the separator 7 and the elastic sheet 8 are sandwiched between the mating surfaces. In particular, the elastic sheet is slightly wider outward than the separator 7 and prevents water leakage to the outside of the water pump 1, and also prevents water leakage at portions other than the flow path inside the water pump 1.
The separator 7 and the elastic sheet 8 are provided with a hole 9 having a diameter slightly larger than the outer diameter of the upper cylindrical portion 70 of the impeller H with the shaft support column 33 as the center.

FIG. 3 is a perspective view of the upper body 3 as viewed from below (lower body 4 side).
The introduction path 35 and the upper discharge path 37 are partitioned by the partition wall 31, and the introduction path 35 connected to the suction port 10 surrounds the shaft support column 33, that is, the shaft support column 33 is positioned in the introduction path 35. .
FIG. 4 is a perspective view of the lower body 4 as viewed from above (upper body 3 side).
The impeller chamber 45 is defined by a circular side wall 47 having a predetermined gap with respect to the outer periphery of the impeller H, and is set closer to the rear end wall 4b. The lower discharge path 46 is formed by a first wall 48 and a second wall 49 having a constant width interval, one end connecting the first wall 48 to the side wall 47 of the impeller chamber 45 in the tangential direction, and the other end being the lower body. The main body 41 extends in the direction of the front corner.

In addition to the holes 9 described above, the separator 7 and the elastic sheet 8 are further provided with openings 75 (indicated by phantom lines in FIG. 4) at portions corresponding to the front corners of the lower body main body 41. The upper discharge passage 37 of the body 3 and the lower discharge passage 46 of the lower body 4 communicate with each other.
The discharge port 20 has a through hole 21 having a constant inner diameter. The outer shape of the discharge port 20 has a predetermined basic outer diameter, is chamfered to facilitate insertion of the discharge hose at the tip, and has two bead-shaped large-diameter portions 24 spaced apart in the axial direction. 25.

FIG. 5 is an enlarged view of the suction port, where (a) is a longitudinal sectional view and (b) is a sectional view taken along the line BB in (a).
As with the discharge port 20, the suction port 10 has a through hole 11 having a constant inner diameter and a basic outer diameter, and includes two bead-shaped large-diameter portions 14 and 15 that are spaced apart in the axial direction. Relatively, the basic outer diameter portion becomes the small diameter portion 12. Further, the tip of the suction port 10 is chamfered.
The suction port 10 is further provided with a slit 17 perpendicular to the axial direction in the upper half. The slit 17 is formed between the two large diameter portions 14 and 15. As will be described later, the foreign substance capturing member 80 is fitted into the slit 17 and traverses the through hole 11.
The axial width of the slit 17 has a width that matches the thickness D of the foreign material capturing member 80 shown in FIG. 6B, and the bottom wall 18 of the slit 17 is flat horizontally on the diameter line of the through hole 11. It is a surface.

6A and 6B show the shape of the foreign matter capturing member, where FIG. 6A is a front view and FIG. 6B is a side view.
The foreign matter capturing member 80 is made of resin and includes an attachment portion 81 and a filter portion 85.
As shown to (a), the upper half part of the foreign material capture member 80 has the outer shape of the semicircular arc which has the same outer diameter as the basic outer diameter (diameter of a small diameter part) of the suction inlet 10, and a lower half part penetrates it. It has a front shape that fits within a semicircular arc having the same outer diameter as the diameter of the hole 11. The centers of the respective arcs coincide with each other, a plurality of circular rings 86 (86a, 86b, 86c) centering on the centers are formed, and a gap 88 (88a, 88b) is formed between the adjacent circular rings 86. Yes. The plurality of circular rings 86 are connected by a radial connecting portion 87 having the same width as the circular ring 86.
A plurality of circular rings 86 and a connecting portion 87 connecting them form a filter portion 85, and foreign matter is captured when water passes through a gap 88 between the circular rings 86. For washing machine circulation, if the width of the gap 88 is set to 1 mm or less, a high catching rate with respect to lint can be obtained.
The foreign matter capturing member 80 has a constant thickness D through the upper half and the lower half as shown in FIG. The thickness D is set so as to match the width (axial direction) of the slit 17 in the suction port 10.

The attachment portion 81 is the outermost semicircular ring portion of the upper half portion, and its radial width is the same as the thickness t (see (a) of FIG. 5) of the basic outer diameter portion of the suction port 10. The inner wall is aligned with the inner wall of the through hole 11.
This attachment portion 81 is engaged with the suction port 10 when the foreign material capturing member 80 is inserted into the slit 17 of the suction port 10, and the thickness D is fitted in conformity with the width of the slit 17. The position of the foreign material capturing member 80 in the axial direction with respect to the suction port 10 is determined.

In the filter portion 85, the outermost semicircular ring in the lower half is set to have an outer diameter smaller than the inner diameter of the through hole 11, and the second semicircular ring from the outermost circumference in the upper half is continuous with both. The circular ring 86c is formed, and a gap 88c is formed between the circular ring 86c and the inner wall of the through hole 11.
In the lower half, the connecting portion 87 extends from the outermost circular ring 86 c to a position corresponding to the inner wall of the through hole 11. That is, as described above, the lower half is within the diameter of the through hole 11 indicated by the phantom line in FIG. 6, and the area up to the phantom line is the filter function area. The step portion between the lower half portion and the upper half attachment portion 81 whose outer edge is defined by an imaginary line, that is, both ends of the outermost semicircular ring are aligned on the diameter line and are flat contact surfaces 82. 82.
As shown in FIG. 7A, when the foreign material capturing member 80 is fitted into the slit 17 from above, the contact surface 82 is seated on the bottom wall 18 of the slit 17 as shown in FIG. Contact with. Thereby, the vertical direction and the circumferential direction position of the foreign material capturing member 80 with respect to the suction port 10 are also determined.

FIG. 8 shows a state in which the suction hose is attached to the suction port in which the foreign matter capturing member is fitted.
The suction hose 90 is inserted from the tip of the suction port 10 until it covers the two large diameter portions 14 and 15, and is fixed between the large diameter portions 14 and 15 by the clamp 92.
Since the slit 17 into which the foreign material capturing member 80 is fitted is covered with the suction hose 90 between the large diameter portions 14 and 15, water does not leak out from the slit 17. Further, since the foreign matter catching member 80 is blocked by the suction hose 90, there is no possibility of dropping off.

In the water pump 1 configured as described above, water flows through the following route.
First, the water flowing into the suction port 10 from the suction hose 90 flows through the introduction path 35 of the upper body 3 from the suction port 10 and reaches around the shaft support column 33. A hole 9 is provided in the separator 7 and the elastic sheet 8 around the shaft support column 33, and the upper cylinder portion 70 and the lower cylinder portion 71 of the impeller H are opposed to the hole 9. 4 flows into the central part of the impeller H in 4.

The water urged in the radial direction by the blades 68 of the impeller H rotated by the motor M is pushed out to the lower discharge passage 46 of the lower body 4 and flows through the lower discharge passage 46. 8 proceeds to the upper discharge passage 37 of the upper body 3 through the opening 75 provided in the upper body 3. In this way, it finally reaches the discharge port 20 from the upper discharge path 37 and is discharged to a discharge hose (not shown) connected to the discharge port 20.
In this series of flows, when passing through the suction port 10, it passes through the filter portion 85 of the foreign material catching member, so that lint and other foreign matters mixed in the water flowing through the suction hose 90 are contained in the suction port 10. Captured.

  In this embodiment, the contact surface 82 of the foreign material capturing member corresponds to the engaging portion in the present invention.

The present embodiment is configured as described above, and the suction port 10 is provided with the slit 17 extending from the through hole 11 to the outer periphery, and the foreign matter capturing member 80 having the filter portion 85 is fitted into the slit 17, so that the filter portion Since 85 has crossed the through hole 11 of the suction port 10, the foreign matter mixed in the water sucked into the pump chamber 2 through the suction port 10 is a filter of the foreign matter capturing member that crosses the through hole 11. It is captured by the portion 85 before flowing into the pump chamber 2. Accordingly, the foreign matter does not reach the impeller H and does not accumulate in the pump chamber 2.
In addition, since the foreign matter capturing member 80 is attached to the suction port 10 outside the pump chamber 2, the upper body 3 and the lower body 4 can be removed to remove the foreign matter captured by the filter unit 85 or to replace the foreign matter capturing member 80. There is no need for large-scale disassembly such as separation, and maintenance can be performed easily.

  The slit 17 is formed up to the center height of the through hole 11 in a direction perpendicular to the axis of the suction port 10, and the foreign matter capturing member 80 has an abutment surface 82 that engages with the bottom wall 18 of the slit 17. By simply inserting the foreign matter capturing member 80 into the slit 17 and pushing it in, the abutment surface 82 is seated on the bottom wall 18 at both ends of the slit, and positioning with high accuracy can be achieved.

  The foreign matter capturing member 80 has a semicircular outer shape whose outer half has the same outer diameter (basic outer diameter) as the outer half (basic outer diameter) of the portion where the slit 17 of the suction port 10 is formed. It has a front shape that fits within a semicircular arc of a circle having the same outer diameter as the inner diameter of the through hole 11 of the suction port 10, and a stepped portion between the upper half and the lower half serves as the contact surface 82. Therefore, the outer periphery of the mounting portion 81 whose outer shape is the same as the outer diameter of the small diameter portion 12 of the suction port 10 is aligned with the outer periphery of the small diameter portion 12 of the suction port 10 where the slit 17 is formed, and the suction hose 90 When it is inserted into the suction port 10, there is no obstacle.

  The filter portion 85 of the foreign matter capturing member 80 is configured by connecting a plurality of circular rings 86 that are concentric with the axial center of the through hole 11 of the suction port 10 when connected to the suction port 10 with a connecting portion 87 in the radial direction. The gap 88 c is set between the outermost circular ring and the inner wall of the through hole 11 of the suction port 10. For this reason, water can flow also to the part along the inner wall of the through-hole 11, and it has the advantage that flow resistance is low especially.

  Further, the outer periphery of the suction port 10 has a plurality of large-diameter portions 14 and 15 and a small-diameter portion 12 sandwiched between the large-diameter portions, and a slit 17 is formed in the small-diameter portion 12 and the small-diameter portion. Since the slit 17 and the foreign matter capturing member 80 are sealed from the outside by the suction hose 90 inserted into the suction port 10 across the large-diameter portions 14 and 15 on both sides, the slit 17 is provided in the water flow path. Even if it is provided, water does not leak from it, and a reliable sealing function is exhibited.

Next, a second embodiment will be described.
This is because, in the first embodiment, the slit 17 into which the foreign substance capturing member 80 is fitted is provided in the small diameter portion sandwiched between the two large diameter portions in the suction port 10, instead of the slit 17 ′. It is arranged at the large diameter portion 14 'of the mouth 10'.
Except for the area around the suction port, the second embodiment is the same as the first embodiment.
9A and 9B show a suction port portion according to the second embodiment, wherein FIG. 9A is a longitudinal sectional view, and FIG. 9B is a sectional view taken along the line CC in FIG.
The suction port 10 ′ has a large-diameter portion 14 ′ wider than the thickness D of the foreign matter capturing member 80 ′ on the tip side.
Also in this case, the bottom wall 18 of the slit 17 ′ is a flat surface that is horizontal on the diameter line of the through hole 11 of the suction port 10 ′.

As shown in FIG. 10, the upper half portion of the foreign matter capturing member 80 ′ has a semicircular outer shape having the same outer diameter as the large diameter portion 14 ′ of the suction port 10 ′, and the outermost portion of the upper half portion. The outer circumferential semicircular ring has a radial width that is the same as the wall thickness t ′ of the large-diameter portion 14 ′ of the suction port 10 ′, and becomes an attachment portion 81 ′. Others are the same as the foreign material capturing member 80 in the embodiment.
This produces the same effect as in the first embodiment, and as shown in FIG. 11, the suction hose 90 inserted into the suction port 10 ′ is in close contact with the outer peripheral surface of the suction port 10 ′ particularly at the large diameter portion 14 ′. Therefore, regardless of the presence or absence of clamping in the small diameter portion 12, the slit 17 ′ and the foreign matter capturing member 80 ′ provided in the large diameter portion 14 ′ are reliably sealed from the outside.

In the embodiment, the pump chamber 2 is formed by the upper body 3 and the lower body 4, and the upper body 3 is provided with the suction port 10 (10 ') and the discharge port 20. However, the present invention is not limited thereto. It is not limited, The structure of the pump chamber 2 and arrangement | positioning of suction inlet 10 (10 ') can be set arbitrarily.
In addition, although the foreign material capturing member 80 (80 ′) is an integrally molded product of resin, various shapes can be selected as the shape, particularly the shape of the filter portion 85, depending on the properties of the foreign material to be captured. It can also be set as a two-member molded product in which the filter portion is a wire mesh.
Furthermore, although the embodiment has been described by taking a non-positive displacement pump as an example, the present invention is not limited to this, and the present invention can also be applied to a positive displacement pump device.

It is a figure which shows the external appearance of a 1st Example. It is sectional drawing of a 1st Example. It is the perspective view which looked at the upper body from the lower part. It is the perspective view which looked at the lower body from the upper part. It is an enlarged view which shows a suction inlet part. It is a figure which shows a foreign material capture member. It is a figure which shows the state which fitted the foreign material capture member in the slit. It is a figure which shows the state which inserted the suction hose in the suction inlet. It is an enlarged view which shows the suction inlet part concerning a 2nd Example. . It is a figure which shows the foreign material capture member of a 2nd Example. It is a figure which shows the state which inserted the suction hose in the suction inlet in a 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water pump 2 Pump chamber 3 Upper body 4 Lower body 5 Motor part 7 Separator 8 Elastic sheet 10, 10 'Suction port 11 Through-hole 12 Small diameter part 14, 14', 15 Large diameter part 17, 17 'Slit 18 Bottom wall 20 Discharge Exit 31 Bulkhead 35 Inlet path 37 Upper discharge path 45 Impeller chamber 46 Lower discharge path 52 Stator 60 Rotor 61 Rotor formation part 62 Magnet 65 Impeller unit part 66, 67 Disk-shaped disk 68 Blade 75 Opening 80, 80 'Foreign matter capturing member 81 , 81 ′ Mounting portion 82, 82 Contact surface 85 Filter portion 86 a, 86 b, 86 c Circular ring 87 Connecting portion 88 a, 88 b, 88 c Gap 92 Clamp H Impeller M Motor

Claims (7)

In a pump device having a pump chamber, a suction port for sucking liquid into the pump chamber, and a discharge port for discharging liquid from the pump chamber,
The suction port is provided with a slit from the hole to the outer periphery,
A foreign matter capturing member having a filter portion is inserted into the slit,
The pump device, wherein the filter part of the foreign material capturing member crosses the hole of the suction port. The slit is formed halfway in the radial direction in a direction perpendicular to the axis of the suction port,
The pump device according to claim 1, wherein the foreign matter capturing member has an engaging portion that is engaged with a bottom wall of the slit. The foreign matter catching member has an outer shape of a semicircular arc whose upper half has the same outer diameter as that of the portion of the suction port where the slit is formed, and the lower half has an inner diameter of the hole of the suction port. Having a front shape that fits within a semicircular arc of a circle having the same outer diameter as
The pump device according to claim 2, wherein a step portion between the upper half and the lower half constitutes the engaging portion.   The filter portion is formed by connecting a plurality of circular rings concentric with the axial center of the hole of the suction port by a connecting portion in the radial direction, and a gap is formed between the outermost circular ring and the inner wall of the hole of the suction port. The pump device according to claim 3, wherein the pump device is set to be provided. The outer periphery of the suction port has a plurality of large diameter portions and a small diameter portion sandwiched between the large diameter portions,
The slit is formed in the small diameter portion,
The pump according to any one of claims 1 to 4, wherein the slit and the foreign matter catching member are sealed from the outside by a suction hose externally inserted into the suction port over a large diameter portion on both sides of the small diameter portion. apparatus. The outer periphery of the suction port has a large diameter portion and a small diameter portion,
The slit is formed in the large diameter portion,
5. The pump device according to claim 1, wherein the slit and the foreign matter catching member are sealed from the outside by a suction hose that is extrapolated to the suction port beyond the large diameter portion.   The pump device according to claim 6, wherein the large-diameter portion is formed on an outer distal end side of the suction port.

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