CN110242582B - Pump device - Google Patents

Abstract

The invention provides a pump device, which can restrain the strength reduction of the side wall part of the shell and prevent the accumulation of air bubbles in the drain hole when the shell forming the pump chamber is provided with the drain hole. The pump device (1) is provided with a pump chamber (9) between a housing (7) and a casing (8). The drain hole (42) opens at the bottom surface (90) rather than at the inner peripheral surface (91) of the pump chamber. The drain hole is connected to an inner opening (43) provided in the bottom surface, and extends in the radial direction at a position offset in the axial direction (Z) with respect to the pump chamber. Therefore, even though the drain hole (42) is opened at the side surface (82) of the housing, the strength of the side wall part of the housing (8) can be prevented from being reduced. In addition, the inner opening (43) is provided with an inclined surface (431) which is connected with the bottom surface (90) at an obtuse angle, so that the accumulation of bubbles in the drain hole (42) can be inhibited. Therefore, the generation of sound abnormality, the reduction of pump characteristics, and the damage of the impeller (2) can be suppressed.

Description

Pump device

Technical Field

The present invention relates to a pump device in which a housing forming a pump chamber is provided with a drain hole.

Background

In a non-self-contained pump device in which an impeller disposed in a pump chamber is rotated by a motor, a drain hole (water discharge hole) is provided in a housing constituting the pump chamber in order to prevent a liquid remaining in the pump chamber from freezing. In the conventional pump device, the drain hole is provided in an inner peripheral surface (a radial surface) of the pump chamber. Patent document 1 discloses a pump device in which a drain hole (drain plug hole) is provided in a bottom surface of a pump chamber to discharge circulating water.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4168474

Disclosure of Invention

Technical problem to be solved by the invention

When the drain hole is provided in the inner peripheral surface of the pump chamber, the strength of the side wall portion of the housing surrounding the outer peripheral side of the pump chamber is reduced by the provision of the drain hole. Therefore, in order to avoid a decrease in the pressure resistance of the casing, the wall thickness of the side wall portion of the casing in the axial direction and the wall thickness in the direction perpendicular to the axial direction need to be increased. Therefore, in the high pressure pump device, it is difficult to reduce the thickness of the side wall portion of the casing in the axial direction and the direction orthogonal to the axial direction, and it is difficult to reduce the size of the casing.

On the other hand, as in patent document 1, a drain hole may be provided in the bottom surface of the pump chamber instead of the inner circumferential surface. In this case, since the drain hole does not penetrate the side wall portion of the housing, a decrease in strength of the side wall portion of the housing can be avoided. However, in the case where the drain hole is provided in the bottom surface of the pump chamber, the drain hole opens in the direction orthogonal to the flow direction of the circulating water in the pump chamber, and therefore air bubbles are likely to accumulate in the drain hole. When the air bubbles accumulate in the drain hole, there is a possibility that sound abnormality, deterioration of pump characteristics, and damage to the impeller occur.

In view of the above problems, it is an object of the present invention to provide a pump device in which, when a drain hole is provided in a housing constituting a pump chamber, a reduction in strength of a side wall portion of the housing is suppressed, and bubbles are less likely to accumulate in the drain hole.

Technical scheme for solving problems

In order to solve the above-described problems, the present invention provides a pump device including a housing constituting a pump chamber, an impeller disposed in the pump chamber, and a motor for rotating the impeller, wherein the housing is provided with a suction port and a discharge port communicating with the pump chamber, and a drain hole disposed in a direction different from the discharge port, an inner surface of the pump chamber is provided with a bottom surface facing the impeller in an axial direction, the drain hole is connected to an inner opening portion provided in the bottom surface, and the inner opening portion is provided with an inclined surface connected to the bottom surface at an obtuse angle.

In the pump device of the present invention, the drain hole is opened in the bottom surface, not in the inner peripheral surface of the pump chamber, and therefore the drain hole can be configured not to penetrate the side wall portion of the housing surrounding the outer peripheral side of the pump chamber. Therefore, it is possible to avoid a reduction in the strength of the side wall portion of the housing due to the provision of the drain hole. Therefore, the axial direction of the side wall portion of the housing and the direction orthogonal to the axial direction can be made thin, and deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed. The drain hole is connected to an inner opening provided in the bottom surface of the pump chamber, and the inner opening has an inclined surface connected to the bottom surface at an obtuse angle. Therefore, even if the air bubbles reach the inner opening portion, the air bubbles easily flow along the inclined surface, and therefore, although the drain hole is opened in the bottom surface, the accumulation of the air bubbles in the drain hole can be suppressed. Therefore, the generation of sound abnormality due to air bubbles, the reduction of pump characteristics, and the damage of the impeller can be suppressed.

In the present invention, it is preferable that the inner opening is a recess formed in the bottom surface, an inner surface of the recess on a radially inner side is the inclined surface, and the drain hole is opened on an inner surface of the recess on a radially outer side. In this way, if the drain hole is connected to the inner surface of the recess portion on the radially outer side, the drain hole can be extended in the radial direction at a position offset in the axial direction with respect to the pump chamber. Therefore, although the drain hole is configured to be opened in the radial direction, a decrease in the strength of the side wall portion of the housing can be avoided. Further, when the pump device is installed so that the drain hole faces vertically downward, the inclined surface is inclined upward in the vertical direction of the drain hole, and therefore accumulation of air bubbles in the drain hole can be suppressed.

In the present invention, it is desirable that the inclined surface is continuous with a flat surface portion parallel to the bottom surface. Thus, the inner opening has a shape having a bottom surface (flat surface portion) continuous with the inclined surface. Therefore, in the mold for forming the housing, the leading end of the mold part for forming the inside opening portion can be prevented from being formed in a pointed shape. Therefore, the strength of the die component can be ensured.

In the present invention, it is preferable that a connecting portion between the inner surface of the inner opening and the bottom surface is formed in a rounded shape. In this way, in the mold for forming the housing, the mold component for forming the inner opening portion can be easily manufactured. Further, flow path loss at the time of discharging water from the pump chamber through the inner opening portion can be reduced.

In the present invention, it is preferable that the housing has an end surface facing the opposite side in the axial direction with respect to the bottom surface, the end surface includes a plurality of ribs extending radially about the suction port, and at least one of the plurality of ribs is provided at a position where the drain hole extends. In this way, the strength of the portion forming the bottom of the pump chamber can be increased by the ribs. In addition, the rib can reinforce the part where the water discharge hole is formed. Therefore, deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed.

In the present invention, it is preferable that the pump device includes a metal plate fixed to the housing, and the metal plate is in contact with front end surfaces of the plurality of ribs. Thus, the deformation of the housing can be suppressed by the metal plate, and therefore, the deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed.

In the present invention, it is preferable that the housing includes a side surface facing radially outward and a drainage hole forming portion protruding from the side surface, and the side surface is formed with a protruding portion connected to the drainage hole forming portion. Thus, the drain hole forming portion can be reinforced, and the strength of the side wall portion of the case can be prevented from being lowered by the provision of the drain hole. Therefore, deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed.

Effects of the invention

According to the present invention, the drain hole is not formed in the inner peripheral surface of the pump chamber but is formed in the bottom surface, so that the drain hole does not penetrate the side wall portion of the housing on the outer peripheral side of the pump chamber. Therefore, it is possible to avoid a reduction in the strength of the side wall portion of the housing due to the provision of the drain hole. Therefore, the axial direction of the side wall portion of the housing and the direction orthogonal to the axial direction can be made thin, and deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed. The drain hole is connected to an inner opening provided in the bottom surface, and the inner opening has an inclined surface connected at an angle forming an obtuse angle with the bottom surface. Therefore, even if the air bubbles reach the inner opening portion, the air bubbles easily flow along the inclined surface, and therefore, the accumulation of the air bubbles in the drain hole can be suppressed even though the drain hole is opened in the bottom surface. Therefore, the generation of sound abnormality or the deterioration of the pump characteristics and the damage of the impeller due to the bubbles can be suppressed.

Drawings

Fig. 1 is an external perspective view of a pump device and a drain plug according to embodiment 1 to which the present invention is applied.

Fig. 2 is an exploded perspective view of the pump device according to embodiment 1, as viewed from one side in the axial direction.

Fig. 3 is an exploded perspective view of the pump device according to embodiment 1 as viewed from the other side in the axial direction.

Fig. 4 is a sectional view of the pump device and the drain plug according to embodiment 1.

Fig. 5 is a perspective view of the circuit board, the stator, and the partition member viewed from the other side in the axial direction.

Fig. 6 is a perspective view of the housing.

Fig. 7 is a bottom view and a top view of the housing.

Fig. 8 is an external perspective view of the pump device according to embodiment 2.

Fig. 9 is a front view of the pump device of embodiment 2.

Fig. 10 is a sectional view of the pump device of embodiment 2.

Description of the reference numerals

1. 1a … pump device, 2 … impeller, 3 … motor, 4 … circuit board, 5 … rotor, 6 … stator, 7 … casing (casing body), 8a … casing, 9 … pump chamber, 10 … sealing member, 11 … partition member, 11a … cylindrical portion, 11b … flange portion, 11c … bottom portion, 11d … annular convex portion, 11h … shaft holding portion, 11j … fixing protrusion, 11k … positioning protrusion, 12 … resin sealing member, 13 … screw, 14 … driving magnet, 15 … sleeve, 16 … holding member, 16a … flange portion, 17 … fixing shaft, 18 … thrust bearing member, 19 … connector, 20 … suction port, 21 … suction flow path forming portion, 22 … suction flow path, 3623 … driving coil, 24 … stator, 24a … core outer peripheral ring portion, 24b … pole portion, … insulator, … pole portion, … discharge port 30, … pin 72, … discharge port 30, … discharge port forming portion, …, and …, 31 discharge flow path forming portion, 32 discharge flow path, 40 drain port, 41 drain hole forming portion, 42 drain hole, 43 inner opening portion, 44 tapered surface, 60 metal plate, 61 upper surface facing portion, 62 side surface facing portion, 63 metal plate fixing hole, 64 circular hole, 80 casing body portion, 81 end surface, 82 side surface, 83 circular recess, 84 annular end surface, 85 annular rib, 86a, 86b, 86c radial rib, 87 gate mark, 88 fixing hole, 89 mounting portion, 90 bottom surface, 91 inner peripheral surface, 92 groove portion, 100 drain plug, 101 shaft portion, 102 sealing member, 190 screw, 191 nut, 192 screw fixing portion, 193 through hole, 431 inclined surface, 432 radially outer inner surface, 433, 434 circumferential inner surface, 435 bottom surface (planar portion), 436 … chamfered portion, 811 … frame portion, 821 … projecting portion, 822 … lightening portion, 831 … annular step portion, 832 … inner recess portion, C … virtual center line, Z … axial direction.

Detailed Description

Hereinafter, an embodiment of a pump device to which the present invention is applied will be described with reference to the drawings.

[ embodiment 1]

(Overall Structure)

Fig. 1 is an external perspective view of a pump device 1 and a drain plug 100 to which embodiment 1 of the present invention is applied. Fig. 2 and 3 are exploded perspective views of the pump device 1 according to embodiment 1, fig. 2 is an exploded perspective view viewed from one side Z1 in the axial direction Z, and fig. 3 is an exploded perspective view viewed from the other side Z2 in the axial direction Z. Fig. 4 is a sectional view of the pump device 1 and the drain plug 100 according to embodiment 1, and is a sectional view taken at a position a-a in fig. 1. In the present specification, the three directions XYZ are mutually orthogonal directions. The Z direction is an axial direction of the motor 3 and the impeller 2 described later. Further, one side in the axis direction Z is Z1, the other side is Z2, one side in the X direction is X1, the other side is X2, one side in the Y direction is Y1, and the other side is Y2.

The pump device 1 according to embodiment 1 is a type of pump called a waterproof pump (canned motor pump), and includes an impeller 2 and a motor 3 for rotating the impeller 2. The motor 3 includes a rotor 5, a stator 6, and a circuit board 4 for controlling the motor 3. The motor 3 is a DC brushless motor. The impeller 2 and the rotor 5 are disposed inside a casing formed by a casing 7 and a casing 8, the casing 7 is a casing main body that is integrally formed with the stator 6 and the circuit board 4 and forms a part of the motor 3, and the casing 8 covers one side Z1 in the axial direction Z of the casing 7.

The housing 7 (housing body) and the housing 8 are fixed to each other by a screw 190 and a nut 191 as fixing members. The pump device 1 further includes a metal plate 60 that is fixed in contact with the housing 8 from one side Z1 in the axial direction Z. The case 8 and the metal plate 60 are fixed to the housing 7 by a common screw 190 and a common nut 191.

The housing 8 is provided with a fluid inlet 20, a fluid outlet 30, and a drain port 40. A pump chamber 9 through which the fluid sucked from the suction port 20 passes toward the discharge port 30 is formed between the housing 7 and the casing 8. Further, a seal member 10 such as an O-ring for ensuring the sealing property of the pump chamber 9 is disposed at a joint portion between the housing 7 and the housing 8 (see fig. 4). The housing 7 includes a partition member 11 disposed between the pump chamber 9 and the stator 6 so as to separate the pump chamber 9 from the stator 6, and a resin sealing member 12 made of resin and covering a lower surface and side surfaces of the partition member 11. The resin sealing member 12 is made of BMC (Bulk Molding Compound).

As shown in fig. 2 and 3, the housing 8 includes a substantially rectangular housing main body portion 80 as viewed from the axial direction Z, and mounting portions 89 provided at three of four corner portions of the housing main body portion 80. As shown in fig. 1, the mounting portion 89 protrudes radially outward from the corner portion of the housing main body portion 80. The pump device 1 is attached to the support body via a fixing hole penetrating the attachment portion 89 in the axial direction Z. As shown in fig. 2 and 4, the housing main body portion 80 includes an end surface 81 facing one side Z1 in the axial direction Z and a side surface 82 facing the radially outer side. The end surface 81 is a surface opposite to the bottom surface 90 of the pump chamber 9 in the axial direction Z, and is a surface on which the suction port 20 is provided. The side surface 82 includes four surfaces, i.e., a side surface provided with one side Y1 in the Y direction of the drain port 40, a side surface provided with the other side Y2 in the Y direction of the drain port 30, and side surfaces provided with one side X1 and the other side X2 in the X direction.

(suction inlet, discharge outlet, and water outlet)

In the pump device 1, the fluid suction port 20 is formed at the tip of the tubular suction flow path forming portion 21 that protrudes from the center of the end surface 81 of the housing main body portion 80 to the one side Z1 in the axial direction Z. An intake flow path 22 extending in the axial direction Z is formed inside the intake flow path forming portion 21. As shown in fig. 4, the end of the other side Z2 in the axial direction Z of the suction flow path 22 opens at the center of the bottom surface 90, which is the inner surface of the one side Z1 in the axial direction Z of the pump chamber 9. The discharge port 30 is open to the other side Y2 in the Y direction at the tip of the discharge flow path forming portion 31 projecting from the side surface facing the other side Y2 in the Y direction of the housing 8. A discharge flow path 32 extending in the Y direction is formed inside the discharge flow path forming portion 31 (see fig. 3, 6, and 7). The discharge flow path 32 opens to an inner circumferential surface 91 that is an inner surface on the radially outer side of the pump chamber 9, and extends in the tangential direction of the inner circumferential surface 91 (see fig. 7). The pump device 1 pumps the liquid sucked from the center of the pump chamber 9 by the impeller 2 and discharges the liquid from the discharge flow path 32 in the tangential direction of the pump chamber 9.

The drain port 40 opens to the Y-side Y1 at the tip of the drain hole forming portion 41 projecting from the side surface facing the Y-side Y1 of the housing main body portion 80. A drain hole 42 (see fig. 7) extending in the Y direction is formed in the drain hole forming portion 41. The drain hole 42 extends in the radial direction of the pump chamber 9. As will be described later, the drain hole 42 is connected to an inner opening 43 that opens at the bottom surface 90 of the pump chamber 9, and communicates with the pump chamber 9 via the inner opening 43. In the present embodiment, the drain port 40 faces the opposite side of the drain port 30. That is, the discharge port 30 faces the other side Y2 in the Y direction, and the discharge port 40 faces the one side Y1 in the Y direction. As shown in fig. 4, the pump device 1 is set in an attitude in which one side Y1 in the Y direction is oriented vertically downward (downward in the sheet of fig. 4), and the other side Y2 in the Y direction is oriented vertically upward (upward in the sheet of fig. 4). In this installation posture, the drain hole 42 extends vertically downward from the lower end of the pump chamber 9, and the drain port 40 opens vertically downward.

As shown in fig. 1, a drain plug 100 is detachably attached to the drain port 40. When the pump device 1 is used, the drain port 40 is closed by the drain plug 100. When the pump device 1 is not used, the drain plug 100 is removed from the drain port 40 to open the drain port 40 when the liquid in the pump chamber 9 is discharged (see fig. 4). Thereby, the liquid in the pump chamber 9 is discharged from the drain hole 42. As shown in fig. 4, the drain plug 100 includes a shaft 101 and an annular seal member 102 such as an O-ring held on a distal end surface of the shaft 101. The inner surface of the water discharge hole 42 is provided with a tapered surface 44. The drain plug 100 is configured such that the sealing member 102 is closely attached to the tapered surface 44 over the entire circumference thereof to close the drain hole 42.

(electric motor)

As shown in fig. 4, the rotor 5 includes a driving magnet 14, a cylindrical sleeve 15, and a holding member 16 that holds the driving magnet 14 and the sleeve 15. The holding member 16 is formed in a substantially cylindrical shape with a flange. The driving magnet 14 is fixed to the outer peripheral side of the holding member 16, and the sleeve 15 is fixed to the inner peripheral side of the holding member 16. The impeller 2 is fixed to the flange portion 16a of the holding member 16 disposed on one side Z1 in the axial direction Z of the drive magnet 14. That is, the impeller 2 is attached to the rotor 5. The impeller 2 and the rotor 5 are disposed inside the pump chamber 9.

The rotor 5 is rotatably supported by a fixed shaft 17. The fixed shaft 17 extends in the axial direction Z. An end portion of one side Z1 of the fixed shaft 17 in the axial direction Z is held by the case 8, and an end portion of the other side Z2 of the fixed shaft 17 in the axial direction Z is held by the housing 7. The fixed shaft 17 is inserted through the inner peripheral side of the sleeve 15. Further, a thrust bearing member 18 is attached to the fixed shaft 17 so as to abut on an end surface of one side Z1 of the sleeve 15 in the axial direction Z. In the present embodiment, the sleeve 15 functions as a radial bearing of the rotor 5, and the sleeve 15 and the thrust bearing member 18 function as a thrust bearing of the rotor 5.

Fig. 5 is a perspective view of the circuit board 4, the stator 6, and the partition member 11 as viewed from the other side Z2 in the axial direction Z. As shown in fig. 4 and 5, the stator 6 includes a driving coil 23, a stator core 24, and an insulator 25 as an insulating member, and is formed in a substantially cylindrical shape as a whole. As shown in fig. 4, the stator 6 is disposed on the outer peripheral side of the rotor 5 via a partition member 11. That is, the partition member 11 is disposed between the rotor 5 and the stator 6. The stator 6 is disposed such that the center line of the stator 6 coincides with the axial direction Z.

The stator core 24 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. The stator core 24 of the present embodiment includes an outer peripheral ring portion 24a (see fig. 5) and six salient pole portions 24b (see fig. 4) formed at equal angular pitches on an inner peripheral side of the outer peripheral ring portion 24 a. The driving coil 23 is wound around the salient pole portion 24b of the stator core 24 via an insulator 25. The stator 6 includes a plurality of terminal pins 26 around which end portions of the driving coils 23 are wound and electrically connected. The terminal pin 26 is press-fitted into the insulator 25 and arranged parallel to the axial direction Z.

(partition member)

The partition member 11 is formed into a substantially bottomed cylindrical shape with a flange, and includes a cylindrical portion 11a extending in the axial direction Z, a flange portion 11b formed so as to extend radially outward of the cylindrical portion 11a from an end portion of one side Z1 of the cylindrical portion 11a in the axial direction Z, and a bottom portion 11c closing an opening of the other side Z2 of the cylindrical portion 11a in the axial direction Z. The cylindrical portion 11a is disposed so as to cover the outer peripheral surface of the drive magnet 14.

As shown in fig. 4, a shaft holding portion 11h that holds an end portion of the other side Z2 of the fixed shaft 17 in the axial direction Z is formed in the center of the bottom portion 11c so as to protrude toward one side Z1 in the axial direction Z. Further, a fixing protrusion 11j for fixing the circuit board 4 to the partition member 11 is formed at the center of the bottom portion 11c so as to protrude toward the other side Z2 in the axial direction Z. As shown in fig. 5, a positioning protrusion 11k for positioning the circuit board 4 is formed on the bottom portion 11c so as to protrude toward the other side Z2 in the axial direction Z.

As shown in fig. 4, the inner peripheral side of the partition member 11 and one side Z1 in the axial direction Z form the pump chamber 9, and the partition member 11 and the housing 8 form the pump chamber 9. The impeller 2 and the rotor 5 are disposed on the inner peripheral side of the partition member 11 and on one side Z1 in the axial direction Z. The partition member 11 prevents the fluid in the pump chamber 9 from flowing into the stator 6 and the circuit board 4 at the arrangement portion.

(Circuit Board)

The circuit board 4 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The circuit board 4 is disposed on one side Z1 in the axial direction Z with respect to the driving coil 23, the stator core 24, and the insulator 25. The circuit board 4 is fixed to the partition member 11 by a screw 13 (see fig. 4 and 5) screwed into the fixing projection 11j in a state of being positioned in the radial direction by the fixing projection 11j and the positioning projection 11 k. That is, the circuit board 4 is disposed outside the pump chamber 9. The tip portions of the terminal pins 26 are soldered and fixed to the circuit board 4. Various electronic components not shown are mounted on the circuit board 4.

(resin sealing Member)

The resin sealing member 12 is formed by injecting a resin material such as BMC into the partition member 11 to which the stator 6 and the circuit board 4 are fixed. Specifically, the partition member 11 to which the stator 6 and the circuit board 4 are fixed is disposed in a mold, and a resin material is injected into the mold and cured to form the resin sealing member 12.

The resin sealing member 12 is provided to completely cover the circuit board 4, the driving coil 23, and the like to protect the circuit board 4, the driving coil 23, and the like from the fluid. The resin sealing member 12 is formed in a substantially bottomed cylindrical shape as a whole, and completely covers the circuit board 4, the stator 6, the cylindrical portion 11a, and the bottom portion 11 c. Further, resin seal member 12 covers the lower surface of flange portion 11 b. A connector 19 is attached to an outer peripheral end of the circuit board 4. The connection portion with the circuit substrate 4 on the connector 19 is completely covered with the resin sealing member 12. The outer portion of the connector 19 in the radial direction is not covered with the resin sealing member 12, but is exposed on the side surface of one side X1 in the X direction of the resin sealing member 12, and constitutes a connector portion for external connection (see fig. 1).

(Metal plate)

The metal plate 60 includes an upper surface facing portion 61 that is substantially square when viewed in the axial direction Z, and a side surface facing portion 62 that protrudes outward from four sides of the upper surface facing portion 61 and extends so as to curve toward the other side Z2 in the axial direction Z. The metal plate 60 is assembled such that the suction flow path forming portion 21 is fitted in the circular hole 64 provided in the center of the upper surface facing portion 61, the upper surface facing portion 61 abuts against the end surface 81 of the housing main body portion 80 from one side Z1 in the axial direction Z, and the side surface facing portion 62 is disposed outside the side surface 82 of the housing main body portion 80. By bringing the upper surface facing portion 61 into contact with the end surface 81, deformation of the housing main body portion 80 can be suppressed.

As shown in fig. 2, a plurality of ribs 86 extending radially about the intake flow passage forming portion 21 are formed on the end surface 81 on one side Z1 in the axial direction Z of the housing main body portion 80. A rectangular frame portion 811 having the same height as the rib 86 is provided on the outer peripheral portion of the end surface 81, and the outer peripheral end portion of the rib 86 is connected to the frame portion 811. The upper surface facing portion 61 of the metal plate 60 abuts against the frame portion 811 and the front end surface of the rib 86.

The upper surface facing portion 61 is provided with metal plate fixing holes 63 at four corners. The side surface facing portion 62 is formed on each side of the upper surface facing portion 61 in a range excluding both end portions of each side, and the side surface facing portion 62 is provided in a range on the center side of the position where the metal plate fixing hole 63 is provided. That is, the side surface facing portion 62 is provided at an angular position different from the angular position at which the metal plate fixing hole 63 is provided. By providing the side surface facing portion 62 and the metal plate fixing hole 63 at different angular positions, it is possible to reduce the possibility that the metal plate fixing hole 63 is deformed and the screw 190 cannot be inserted into the metal plate fixing hole 63 when bending is performed to bend the side surface facing portion 62. In addition, a reduction in flatness of the upper surface facing portion 61 can be suppressed. Therefore, the gap can be suppressed from being generated between the upper surface facing portion 61 and the housing 8.

As shown in fig. 2, the housing 7 is substantially rectangular when viewed from the axial direction Z, and screw fixing portions 192 are provided at four corners. The screw fixing portion 192 is formed with a through hole 193 penetrating the corner portion of the resin sealing member 12 and the corner portion of the flange portion 11b in the axial direction Z. The screws 190 are inserted into the metal plate fixing holes 63 provided at the four corners of the upper surface facing portion 61 and the fixing holes 88 penetrating the four corners of the housing main body portion 80 in the axial direction Z, and project from the screw fixing portions 192 to the other side Z2 in the axial direction Z through the through holes 193. Then, the nut 191 is screwed into the tip of the screw 190, whereby the casing of the pump device 1 is formed, and the casing 8 is reinforced by the metal plate 60.

(Structure of connection part of drain hole to pump chamber)

As shown in fig. 2, the outer shape of a portion on one side Z1 in the axial direction Z of the housing body portion 80 is substantially square. The side surface 82 of the housing main body 80 includes four surfaces facing in the Y direction, i.e., one side Y and the other side Y2, and one side X1 and the other side X2, and an extension portion 821 extending outward is formed at the center of each surface. The housing main body 80 has an extension 821 formed at the other side Z2 in the axial direction Z, and has a substantially circular outer shape at the other side Z2 in the axial direction Z (see fig. 3). The housing main body 80 has an extension 821 at a portion constituting a side wall portion surrounding the outer periphery of the pump chamber 9, and the side wall portion surrounding the outer periphery of the pump chamber 9 is reinforced by the extension 821. Further, the extension 821 formed on the side surface of the housing main body 80 in the Y1 direction is connected to the drain hole forming part 41 radially protruding from the side surface, and the drain hole forming part 41 is reinforced by the extension 821.

As shown in fig. 3, a circular recess 83 that opens on the other side Z2 of the housing main body 80 in the axial direction Z is formed inside the housing main body 80. An annular end surface 84 that abuts the flange portion 11b of the partition member 11 is formed on the outer peripheral side of the circular recess 83. A weight-reduced portion 822 (see fig. 2) which is a recess formed on the inner peripheral side of the protruding portion 821 is formed on the opposite side of the annular end surface 84 in the axial direction Z. Since the reduced weight portion 822 is provided on the back side of the annular end surface 84, the flatness of the annular end surface 84 can be improved, and therefore, the formation of a gap between the annular end surface 84 and the flange portion 11b can be suppressed. Further, by securing the height of the extension 821 in the axial direction Z, it is possible to suppress the outer peripheral end of the housing main body 80 from floating from the flange portion 11b and failing to secure the sealing property at the portion where the seal member 10 is disposed between the flange portion 11b and the extension 821.

As shown in fig. 3 and 4, the circular recess 83 is provided with an annular step 831 in an outer peripheral portion thereof, and an inner recess 832 recessed toward a side Z1 in the axial direction Z with respect to the annular step 831 is formed inside the annular step 831. As shown in fig. 2 and 4, an annular convex portion 11d that is fitted inside the circular concave portion 83 of the housing main body portion 80 and abuts against the annular stepped portion 831 in the axial direction Z is formed in the partition member 11 that constitutes the housing 7. The bottom surface of the inner recess 832 is the bottom surface 90 that is the inner surface of one side Z1 in the axial direction Z of the pump chamber 9. The inner peripheral surface of the inner recess 832 is the inner peripheral surface 91 of the pump chamber 9.

Fig. 6 is a perspective view of the housing 8. The discharge flow path 32 is partially formed by a groove formed in the annular step 831 of the circular recess 83, and opens in the tangential direction of the pump chamber 9 in the inner circumferential surface 91 of the pump chamber 9. Further, the intake flow path 22 opens in the axial direction Z at the center of the bottom surface 90 of the pump chamber 9, and the inner opening 43 connected to the drain hole 42 opens at the outer peripheral portion of the bottom surface 90. The inner opening 43 is a recess formed in the bottom surface 90 of the pump chamber 9. The inner surface of the inner opening 43 includes a radially inner surface, i.e., a sloped surface 431, a radially outer inner surface 432, circumferential one and other inner surfaces 433 and 434, and a bottom surface 435 (a flat surface portion). The inclined surface 431 is connected to the bottom surface 90 of the pump chamber 9 at an obtuse angle. Further, a rounded chamfer 436 is provided at the junction between the inner surface (the inclined surface 431 and the inner surfaces 433 and 434) of the inner opening 43 and the bottom surface 90 of the pump chamber 9. The bottom 435 of the inner opening 43 is a flat surface parallel to the bottom 90 of the pump chamber 9, and is continuous with the inclined surface 431 and the inner surfaces 432, 433, and 434.

The radially outer inner surface 432 of the inner opening 43 is continuous with the inner circumferential surface 91 of the pump chamber 9. The inner peripheral surface 91 of the pump chamber 9 forms a groove 92 in which the other side Z2 of the inner surface 432 of the inner opening 43 in the axial direction Z is slightly recessed toward the outer peripheral side, and the inner surface 432 is a surface flush with the bottom surface of the groove 92. The drain hole 42 opens to an inner surface 432 radially outside the inner opening 43. The inclined surface 431, which is an inner surface in the radial direction, is provided at a position facing the inner surface 432 of the opening of the drain hole 42. As shown in fig. 4 and 6, in a state where the pump device 1 is installed such that the drain port 40 faces downward in the vertical direction (Y1 direction in fig. 4 and 6), the inclined surface 431 is located above the drain port 42 in the vertical direction (Y2 direction in fig. 4 and 6) and extends obliquely upward toward the bottom surface 90 of the pump chamber 9. Therefore, even if the bubbles in the pump chamber 9 reach the inner opening 43, the bubbles easily flow along the inclined surface 431, and therefore the bubbles are not easily accumulated in the inner opening 43.

As shown in fig. 4, the drain hole 42 is a flow path that opens at an inner surface 432 radially outward of a recess (inner opening 43) formed in the bottom surface 90 of the pump chamber 9 and extends radially outward from the inner surface 432. That is, the drain hole 42 is a flow path extending in the radial direction at a position offset in the axial direction Z with respect to the pump chamber 9. When the drain hole 42 is provided at such a position, the drain hole 42 does not penetrate the portion of the housing 8 surrounding the outer periphery of the pump chamber 9, and therefore, the strength of the side wall portion of the housing 8 surrounding the outer periphery of the pump chamber 9 can be suppressed from being reduced.

(arrangement of Ribs)

Fig. 7 is a bottom view and a top view of the housing 8. Fig. 7(a) is a bottom view of the housing 8 as viewed from the other side Z2 in the axial direction Z, and fig. 7(b) is a top view of the housing 8 as viewed from the one side Z1 in the axial direction Z. As shown in fig. 7(b), a portion of one side Z1 in the axial direction Z of the housing 8 is substantially square, and fixing holes 88 are formed at the corners of four positions. In addition, eight ribs 86 extending radially about the intake flow path forming portion 21 are formed on the end surface 81 on one side Z1 in the axial direction Z of the housing 8. The eight ribs 86 are arranged at equal angular intervals. Four ribs 86a of the eight ribs 86 extend toward the corner portions where the fixing holes 88 are formed, being formed at the same angular positions as the fixing holes 88. In addition, the other four ribs 86b of the eight ribs 86 are formed at angular positions in the middle of the circumferentially adjacent fixing holes 88. One of the four ribs 86b extending to the one side Y1 in the Y direction is formed at a position where the drain hole 42 extends, and is connected to the drain hole forming portion 41. Therefore, the drain hole forming portion 41 is reinforced by the rib 86 b.

As shown in fig. 7(a), gate marks 87 of a mold used for injection molding of the housing 8 are formed at four locations on the bottom surface 90 of the pump chamber 9. The gate marks 87 are arranged at equal angular intervals around the intake port 20 and the intake passage 22. The four gate marks 87 are formed at angular positions where the four virtual center lines C passing through the centers of the gate marks 87 adjacent in the circumferential direction coincide with the angular positions of the fixing holes 88, respectively. As described above, the rib 86a is formed at the angular position of the fixing hole 88. Therefore, the four virtual center lines C coincide with the angular positions of the ribs 86a, respectively. Further, the gate marks 87 at the four positions are formed at angular positions corresponding to one of the four ribs 86b, respectively. A virtual center line C passing through the centers of the gate marks 87 adjacent in the circumferential direction is a position which becomes a confluence point of the resin at the time of injection molding, and is a position of the weld line. Therefore, the four ribs 86a are provided at positions where the portions where the fixing holes 88 are formed are reinforced and the portions where the weld lines are formed are reinforced.

(main effects of embodiment 1)

As described above, in the pump device 1 according to embodiment 1, the drain hole 42 is opened at the bottom surface 90 and is not opened at the inner circumferential surface 91 of the pump chamber 9, so that the drain hole 42 can be configured not to penetrate the side wall portion of the housing 8 surrounding the outer circumferential side of the pump chamber 9. Therefore, the strength of the side wall portion surrounding the outer peripheral side of the pump chamber 9 can be prevented from being reduced by the provision of the drain hole 42. Therefore, the axial direction Z of the side wall portion of the housing 8 and the direction orthogonal to the axial direction Z can be thinned, and deformation or damage of the housing 8 due to the internal pressure of the pump chamber 9 can be suppressed. The drain hole 42 is connected to an inner opening 43 provided in the bottom surface 90, and the inner opening 43 includes an inclined surface 431 connected to the bottom surface 90 at an obtuse angle. Therefore, even if the air bubbles reach the inner opening 43, the air bubbles easily flow along the inclined surface 431, so that the water drain hole 42 can be opened in the bottom surface 90, and accumulation of the air bubbles in the water drain hole 42 can be suppressed. Therefore, the generation of sound abnormality due to air bubbles, the reduction of pump characteristics, and the damage of the impeller 2 can be suppressed.

In embodiment 1, the inner opening 43 for connecting the drain hole 42 is a recess formed in the bottom surface 90, the inner surface of the recess (inner opening 43) on the radially inner side is an inclined surface 431, and the drain hole 42 is opened on the inner surface 432 on the radially outer side. By connecting the drain hole 42 to the radially outer inner surface 432 in this way, the drain hole 42 can be extended in the radial direction at a position offset in the axial direction Z with respect to the pump chamber 9. Therefore, the drain hole 42 can be opened in the radial direction while avoiding a decrease in the strength of the side wall portion of the housing 8. When the pump device 1 is installed such that the drain hole 42 faces downward in the vertical direction, the inclined surface 431 is formed as a surface inclined upward obliquely above the drain hole 42 in the vertical direction. Therefore, accumulation of air bubbles in the drain hole 42 can be suppressed.

In embodiment 1, the inclined surface 431 of the inner opening 43 is continuous with the bottom surface 435 which is a flat surface portion parallel to the bottom surface 90 of the pump chamber 9. In this way, if the inner opening 43 has a shape having the bottom surface 435 (flat surface portion) continuous with the inclined surface 431, the shape of the die component for forming the inner opening 43 can be prevented from being tapered in the die for forming the housing 8. Therefore, the strength of the die component can be ensured.

In embodiment 1, the connecting portion between the inner surface of the inner opening 43 and the bottom surface 90 of the pump chamber 9 is formed in a rounded shape. By providing the connecting portion between the surfaces in a rounded shape as described above, the die component for forming the inner opening 43 can be easily manufactured in the die for forming the housing 8. Further, flow path loss at the time of discharging water from the pump chamber 9 through the inner opening 43 can be reduced.

The housing 8 of embodiment 1 includes an end surface 81 facing the opposite side to the bottom surface 90 of the pump chamber 9, and the end surface 81 includes a plurality of ribs 86 extending radially about the suction port 20. Therefore, the strength of the portion constituting the bottom of the pump chamber 9 can be increased by the rib 86. Further, since one of the plurality of ribs 86 is provided at a position where the drain hole 42 extends, the portion where the drain hole 42 is formed can be reinforced by the rib 86. Therefore, deformation or damage of the housing 8 due to the internal pressure of the pump chamber 9 can be suppressed.

The housing 8 according to embodiment 1 includes a side surface 82 facing radially outward, and a protruding portion 821 protruding radially outward is formed on the side surface 82. A drain hole forming portion 41 is formed on the side surface of the housing main body portion 80 in the Y1 direction, and an extension portion 821 is connected to the drain hole forming portion 41. Therefore, since the drain hole forming portion 41 can be reinforced by the extension portion 821, a reduction in strength of the side wall portion of the housing 8 due to the provision of the drain hole 42 can be avoided. Therefore, deformation or damage of the housing 8 due to the internal pressure of the pump chamber 9 can be suppressed.

In embodiment 1, the metal plate 60 fixed to the case 8 is provided, and the upper surface facing portion 61 of the metal plate 60 abuts against the distal end surfaces of the plurality of ribs 86. Therefore, since the deformation of the housing 8 can be suppressed by the metal plate 60, the deformation or damage of the housing 8 due to the internal pressure of the pump chamber 9 can be suppressed. Further, since the metal plate 60 includes the upper surface facing portion 61 that abuts against the rib 86 and the side surface facing portion 62 that covers the side surface 82 of the case 8, the strength of the metal plate 60 can be increased by the side surface facing portion 62.

In embodiment 1, a metal plate fixing hole 63 for allowing a screw 190 for fixing to the case 8 to pass therethrough is provided in a corner portion of the metal plate 60. The side surface facing portion 62 of the metal plate 60 is provided at an angular position different from the metal plate fixing hole 63. Therefore, when the side surface facing portion 62 is formed by bending the metal plate, the metal plate fixing hole 63 is less likely to be deformed, and therefore, the screw 190 cannot be inserted into the metal plate fixing hole 63 and the metal plate 60 cannot be fixed. In addition, since the flatness of the upper surface facing portion 61 is less likely to be lowered, there is less likelihood that a gap is generated between the metal plate 60 and the case 8, so that the reinforcing effect is lowered.

In embodiment 1, gate marks 87 of a mold used for injection molding of the housing 8 are formed at four positions at equal intervals in the circumferential direction around the suction port 20. Further, the virtual center line C passing through the centers of the gate marks 87 adjacent in the circumferential direction coincides with the angular position of any one of the plurality of ribs 86 (rib 86a in embodiment 1) and coincides with the angular position of the fixing hole 88 for fixing the housing 7 (housing body) and the housing 8. A virtual center line C passing through the middle of the circumferentially adjacent gate marks 87 is an angular position where a weld line is formed. In the present embodiment, since the rib 86a is formed at an angular position where the weld line is formed, the portion where the weld line is formed can be reinforced by the rib 86 a. Therefore, the case 8 can be suppressed from being deformed and damaged from the weld line. Further, since the rib 86a is formed at the angular position of the fixing hole 88, the portion where the fixing hole 88 is formed can be reinforced by the rib 86 a. In this way, since the strength of the case 8 can be secured by reinforcing the portion with reduced strength with the rib 86a, the occurrence of deformation or damage due to the internal pressure can be suppressed.

In embodiment 1, the gate marks 87 at four positions are aligned with the angular positions of one of the plurality of ribs 86 (rib 86b in embodiment 1). By forming the rib 86 also in the gate mark 87 in this way, the plurality of ribs 86 can be arranged uniformly to enhance the reinforcing effect of the housing 8.

[ embodiment 2]

Fig. 8 is an external perspective view of a pump device 1A according to embodiment 2. Fig. 9 is a front view of the pump device 1A according to embodiment 2, and fig. 10 is a sectional view of the pump device 1A according to embodiment 2 (sectional view at the position B-B in fig. 9). Hereinafter, points different from embodiment 1 will be described, and the same points are denoted by the same reference numerals as embodiment 1, and description thereof will be omitted. The pump device 1A according to embodiment 2 includes the casing 7 (casing main body) and the casing 8A covering one side Z1 in the axial direction Z of the casing 7, but does not include the metal plate 60 for reinforcing the casing 8A. The case 8A and the housing 7 are fixed to each other by screws 190 as fixing members. As shown in fig. 10, the fixing hole 88 of the case 8A is a screw hole, and the front end of the screw 190 is screwed into the fixing hole 88 instead of the nut.

As shown in fig. 8 and 9, the housing 8A is provided with a fluid intake port 20, a fluid discharge port 30, and a water discharge port 40. The drain port 40 opens at the tip of a drain hole forming portion 41 protruding from the side surface of one side Y1 in the Y direction of the housing 8A. The housing 8A includes a housing main body 80 and mounting portions 89 formed at three corners of the housing main body 80. On an end surface 81 of one side Z1 in the axial direction Z of the housing main body portion 80, a plurality of ribs 86 extending radially about the suction port 20 and a plurality of ribs 85 extending annularly about the suction port 20 are formed. The annular rib 85 is connected to the drain hole forming portion 41.

The plurality of ribs 86 extending in the radial direction include four ribs 86a and four ribs 86b, as in embodiment 1, the four ribs 86a are provided at the same angular positions as the virtual center line C passing through the centers of the gate marks 87 adjacent in the circumferential direction, and the four ribs 86b are provided at the same angular positions as the gate marks 87. The rib 86a provided at the same angular position as the virtual center line C is provided at the same angular position as the fixing hole 88 for fixing the case 8A and the housing 7. In embodiment 2, the intervals between the radial ribs 86 are narrower than those of the radial ribs 86 of embodiment 1, and one rib 86c is provided at each angular position between the ribs 86a and 86 b. In this way, the interval between the ribs 86 is set to be narrow, and the reinforcing effect of the case 8A is enhanced by providing the annular rib 85, so that the occurrence of deformation or damage due to the internal pressure can be suppressed even without attaching the metal plate 60. Instead of the annular rib 85, an arc-shaped rib may be provided. That is, a rib extending in the circumferential direction can be provided to improve the reinforcing effect.

As shown in fig. 10, a pump chamber 9 is formed between the housing 8A and the casing 7. In embodiment 2, an inner opening 43 is formed in a bottom surface 90 of the pump chamber 9, and the drain hole 42 opens on an inner surface radially outside the inner opening 43. The inner surface of the inner opening 43 on the radially inner side is an inclined surface 431 connected to the bottom surface 90 of the pump chamber 9 at an obtuse angle.

As described above, in the pump device 1A according to embodiment 2, the drain hole 42 is opened in the bottom surface 90, not in the inner circumferential surface 91 of the pump chamber 9, as in embodiment 1, and therefore the drain hole 42 may not penetrate the side wall portion of the housing 8 on the outer circumferential side of the pump chamber 9. Therefore, a decrease in the strength of the side wall portion of the housing 8A can be avoided, so that deformation or damage of the housing 8A due to the internal pressure of the pump chamber 9 can be suppressed. The drain hole 42 is connected to an inner opening 43 provided in the bottom surface 90, and the inner opening 43 includes an inclined surface 431 connected at an angle forming an obtuse angle with the bottom surface 90. Therefore, even if the air bubbles reach the inner opening 43, the air bubbles easily flow along the inclined surface 431, and therefore the water drain hole 42 can be opened in the bottom surface 90, and accumulation of the air bubbles in the water drain hole 42 can be suppressed. Therefore, the generation of sound abnormality due to air bubbles, the reduction of pump characteristics, and the damage of the impeller 2 can be suppressed.

Claims (8)

1. A pump device comprising a housing constituting a pump chamber, an impeller disposed in the pump chamber, and a motor for rotating the impeller,

the housing is provided with a suction port and a discharge port communicating with the pump chamber, and a drain hole disposed in a direction different from the discharge port,

an inner surface of the pump chamber has a bottom surface facing the impeller in an axial direction,

the drain hole is connected with an inner side opening part arranged on the bottom surface,

the inner opening has an inclined surface connected to the bottom surface at an obtuse angle, and is a recess formed in the bottom surface,

the inner surface of the radially inner side of the concave portion is the inclined surface, and the drain hole is opened at the inner surface of the radially outer side of the concave portion.

2. Pump apparatus according to claim 1,

the inclined surface is connected with a plane part parallel to the bottom surface.

3. Pump apparatus according to claim 2,

the inner surface of the inner opening and the connecting part of the bottom surface are in a shape of a circular horn.

4. Pump apparatus according to claim 1,

the inner surface of the inner opening and the connecting part of the bottom surface are in a shape of a circular horn.

5. Pump device according to any one of claims 1 to 4,

the housing has an end surface facing the opposite side in the axial direction with respect to the bottom surface,

the end face has a plurality of ribs extending radially about the suction port,

at least one of the ribs is provided at a position where the drain hole extends.

6. Pump apparatus according to claim 5,

the pump device comprises a metal plate fixed on the shell,

the metal plate abuts against front end surfaces of the plurality of ribs.

7. The pump arrangement according to claim 6,

the housing includes a side surface facing radially outward and a drainage hole forming portion protruding from the side surface,

and a protruding part connected to the drain hole forming part is formed on the side surface.

8. Pump apparatus according to claim 1,

the housing includes a side surface facing radially outward and a drainage hole forming portion protruding from the side surface,

and a protruding part connected to the drain hole forming part is formed on the side surface.

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