JP5641874B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device in which a partition wall is disposed between a pump chamber in which an impeller and a rotor are arranged and a stator arrangement portion to prevent inflow of fluid.

  2. Description of the Related Art Conventionally, there is known a pump device in which a partition plate (partition wall) that prevents inflow of fluid is disposed between a pump chamber in which an impeller and a rotor are disposed and an arrangement position of a stator and a substrate (for example, Patent Documents). 1). In the pump device described in Patent Document 1, the partition plate is formed in a bottomed cylindrical shape with a flange having a cylindrical portion and a flange portion. Further, in this pump device, the stator and the substrate are covered with a mold resin in order to prevent fluid from entering the stator and the substrate. In addition to the stator and the substrate, this mold resin covers one surface of the flange portion and the cylindrical portion.

  Moreover, this mold resin is formed by injection molding. Specifically, the partition plate to which the stator and the substrate are attached is placed in a mold, and the resin is injected into the mold and cured to form a mold resin. In the pump device described in Patent Document 1, there is provided a retaining protrusion for preventing the partition plate from being lifted from the mold resin (that is, the mold resin is peeled off from the partition plate) after the mold is opened. It has been. The retaining projection is formed at the bottom of the cylindrical portion of the partition plate.

JP 2008-75462 A

  In the pump device described in Patent Document 1, as described above, since the retaining projection is formed on the partition plate, it is possible to prevent peeling of the mold resin from the partition plate. However, in this pump device, since the retaining projection is formed at the bottom of the cylindrical portion of the partition plate, it is possible to effectively prevent the mold resin from peeling off from the bottom of the cylindrical portion of the partition plate. However, peeling of the mold resin from the collar portion of the partition plate cannot be effectively prevented. Since the boundary surface between the flange portion and the mold resin appears on the outer peripheral surface of the pump device, when the mold resin peels from the flange portion of the partition plate, the possibility that fluid enters the stator or the like increases.

  Then, the subject of this invention is providing the pump apparatus which can prevent effectively the penetration | invasion of the fluid to the stator etc. which are covered with the resin member.

In order to solve the above-described problems, a pump device according to the present invention includes an impeller, a rotor to which the impeller is attached, a stator that is disposed on the outer peripheral side of the rotor, and a pump through which the impeller and the rotor are disposed and the fluid passes. A partition member having a partition wall disposed between the stator and the pump chamber to prevent the fluid in the pump chamber from flowing into the location where the stator is disposed, and a resin resin member formed so as to cover the stator The partition is formed in a substantially bottomed cylindrical shape with a flange having a bottom portion, a cylindrical portion, and a flange portion, and the flange portion extends from the opening side end portion of the cylindrical portion to the outside in the radial direction of the cylindrical portion. In the axial direction of the cylindrical portion, when the side on which the bottom portion is disposed is one side, the resin member is formed so as to cover the bottom portion and the cylindrical portion and to cover the surface on one side of the flange portion. On one side of the bulkhead Peeling prevention portion for preventing the separation of the fat member is arranged, the peeling prevention part includes a plurality of peeling prevention projection which is disposed so as to surround the cylindrical portion with projecting from the flange portion to one side, the outer peripheral side of the cylindrical portion Including a ring-shaped peeling prevention member fixed to a plurality of peeling prevention protrusions so as to surround the entire circumference, a gap is formed between the collar portion and the peeling prevention member, A part of the resin member is arranged .

  In the pump device of the present invention, if the side on which the bottom is disposed is one side in the axial direction of the cylindrical portion, a separation preventing portion that prevents separation of the resin member from the partition member is disposed on one side of the flange portion. ing. Therefore, it is possible to effectively prevent the resin member formed so as to cover the surface on one side of the flange from the surface on one side of the flange. Therefore, in the present invention, even if the boundary surface between the flange portion and the resin member appears on the outer peripheral surface of the pump device, it is possible to effectively prevent fluid from entering the stator or the like covered with the resin member. Become.

Further, in the present invention , the peeling prevention portion includes a plurality of peeling prevention projections, and the peeling prevention member is formed in an annular shape and is fixed to the plurality of peeling prevention projections so as to surround the cylindrical portion . Compared with the case where the separation preventing portion includes a plurality of separation preventing members divided in the circumferential direction of the cylindrical portion, handling of the separation preventing member during assembly of the pump device is facilitated. In addition, the number of parts of the pump device can be reduced.

In the present invention, the stator preferably includes a stator core, and when viewed from the axial direction of the cylindrical portion, it is preferable that a part of the separation preventing part and a part of the stator core overlap each other.

  As described above, in the pump device of the present invention, it is possible to effectively prevent fluid from entering the stator or the like covered with the resin member.

It is sectional drawing of the pump apparatus concerning embodiment of this invention. It is a bottom view of the state where the stator shown in FIG. 1 is fixed to the partition member. It is a perspective view which shows the state by which the peeling prevention member is being fixed to the partition member shown in FIG. 1 from the lower surface side. It is a side view which shows the state by which the peeling prevention member is being fixed to the partition member shown in FIG. It is a disassembled perspective view which shows the state which decomposed | disassembled the partition member and peeling prevention member shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of the pump device)
FIG. 1 is a cross-sectional view of a pump device 1 according to an embodiment of the present invention. FIG. 2 is a bottom view of the state in which the stator 5 shown in FIG. 1 is fixed to the partition wall member 11. In the following description, the upper side (Z1 direction side) in FIG. 1 is the “upper” side, and the lower side (Z2 direction side) in FIG. 1 is the “lower” side.

  The pump device 1 of this embodiment is a type of pump called a can pump, and includes an impeller 2 and a DC brushless motor 3 (hereinafter referred to as “motor 3”) that rotates the impeller 2. The motor 3 includes a rotor 4 and a stator 5. The impeller 2 and the motor 3 are disposed inside a case body constituted by a housing 6 and an upper case 7 that covers an upper portion of the housing 6. The housing 6 and the upper case 7 are fixed to each other by screws 8.

  The upper case 7 is formed with a fluid suction portion 7a and a fluid discharge portion 7b. A pump chamber 9 is formed between the housing 6 and the upper case 7 through which the fluid sucked from the suction portion 7a passes toward the discharge portion 7b. In addition, a seal member (O-ring) 10 for securing the hermeticity of the pump chamber 9 is disposed at a joint portion between the housing 6 and the upper case 7.

  The housing 6 includes a partition member 11 having a partition 11 a disposed between the pump chamber 9 and the stator 5 so as to separate the pump chamber 9 and the stator 5, and a resin resin that covers a lower surface and side surfaces of the partition member 11. And a member 12. A detailed configuration of the housing 6 will be described later.

  The rotor 4 includes a drive magnet 14, a cylindrical sleeve 15, and a holding member 16 that holds the drive magnet 14 and the sleeve 15. The holding member 16 is formed in a substantially cylindrical shape with a hook. The drive 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 the upper side. The impeller 2 and the rotor 4 are disposed inside the pump chamber 9.

  The rotor 4 is rotatably supported on the fixed shaft 17. The fixed shaft 17 is arranged with the vertical direction as the axial direction. That is, the vertical direction is the axial direction of the rotor 4. The upper end of the fixed shaft 17 is held by the upper case 7, and the lower end of the fixed shaft 17 is held by the housing 6. The fixed shaft 17 is inserted through the inner peripheral side of the sleeve 15. In addition, two thrust bearing members 18 are attached to the fixed shaft 17 so as to sandwich the sleeve 15 in the vertical direction. In this embodiment, the sleeve 15 functions as a radial bearing for the rotor 4, and the sleeve 15 and the thrust bearing member 18 function as a thrust bearing for the rotor 4.

  The stator 5 includes a drive coil 23, a stator core 24, and a bobbin 25, and is formed in a substantially cylindrical shape as a whole. The stator 5 is disposed on the outer peripheral side of the rotor 4 via a partition wall 11a described later. Hereinafter, the radial direction of the rotor 4 and the stator 5 is referred to as “radial direction”, and the circumferential direction of the rotor 4 and the stator 5 is referred to as “circumferential direction”.

  The stator core 24 is a laminated core formed by laminating thin magnetic plates made of a magnetic material. As shown in FIG. 2, the stator core 24 includes a substantially annular ring portion 24a that constitutes the outer peripheral surface of the stator core 24, and a plurality of salient pole portions 24b that protrude radially inward from the annular portion 24a. I have. The plurality of salient pole portions 24b are formed at an equiangular pitch. The bobbin 25 is made of an insulating material such as resin. Moreover, the bobbin 25 is formed in the cylindrical shape with a hook which has a collar part in both ends.

  The driving coil 23 is wound around the outer peripheral surface of the bobbin 25. Both end portions of the driving coil 23 are entangled with terminal pins 26 fixed to the collar portion of the bobbin 25. The bobbin 25 around which the driving coil 23 is wound is inserted into the salient pole portion 24b from the inside in the radial direction and fixed to the stator core 24. That is, the driving coil 23 is wound around the salient pole portion 24 b via the bobbin 25.

(Housing configuration)
FIG. 3 is a perspective view showing the state where the separation preventing member 32 is fixed to the partition wall member 11 shown in FIG. 1 from the lower surface side. FIG. 4 is a side view showing a state in which the peeling preventing member 32 is fixed to the partition wall member 11 shown in FIG. FIG. 5 is an exploded perspective view showing a state in which the partition wall member 11 and the peeling prevention member 32 shown in FIG. 3 are disassembled.

  As described above, the partition wall member 11 includes the partition wall 11a. The partition wall 11a is formed in a substantially bottomed cylindrical shape with a flange, and includes a cylindrical portion 11b, a bottom portion 11c, and a flange portion 11d. The cylindrical portion 11 b is formed in a cylindrical shape and is disposed so as to cover the outer peripheral surface of the driving magnet 14. Moreover, the cylindrical part 11b is arrange | positioned so that the axial direction may correspond with an up-down direction substantially. The bottom part 11c is formed in a disk shape that closes the lower end of the cylindrical part 11b. The flange part 11d is formed so as to spread outward in the radial direction from the upper end part serving as the opening side end part of the cylindrical part 11b. As shown in FIG. 1, the inner side and the upper side of the partition wall 11a serve as the pump chamber 9, and the impeller 2 and the rotor 4 are disposed on the inner side and the upper side of the partition wall 11a. The partition wall 11 a functions to prevent the fluid in the pump chamber 9 from flowing into the place where the stator 5 is disposed.

  As shown in FIG. 1, two substrates 27 and 28 are fixed below the bottom 11c with a predetermined gap in the vertical direction. A fixing projection 11e for fixing the substrate 27 to the partition wall member 11 and a positioning projection 11f for positioning the substrate 27 are formed on the lower surface of the bottom portion 11c. As shown in FIG. 1, the substrate 27 is fixed to the lower surface side of the bottom portion 11c by a screw 29 screwed into the fixing protrusion 11e while being positioned by the fixing protrusion 11e and the positioning protrusion 11f. The substrate 28 is fixed to the lower surface of the bottom portion 11c by adhesion in a state where the substrate 28 is positioned by the fixing projection 11e and the positioning projection 11f.

  A plurality of anti-rotation grooves 11g for preventing rotation of the stator core 24 relative to the partition wall member 11 is formed on the outer peripheral surface of the cylindrical portion 11b. The rotation preventing groove 11g is formed in parallel with the vertical direction. Further, the rotation preventing groove 11g is formed in a square groove shape, and is formed in almost the entire area of the cylindrical portion 11b excluding a part on the upper end side in the vertical direction. The plurality of rotation preventing grooves 11g are formed at an equiangular pitch. As shown in FIG. 2, the leading end side of the salient pole portion 24 b disposed on the inner side in the radial direction is disposed in the rotation preventing groove 11 g. A convex portion 11h is formed between the plurality of rotation preventing grooves 11g. As shown in FIG. 2, a gap is formed between the flange portion 25a disposed on the radially inner side of the bobbin 25 and the outer peripheral surface of the convex portion 11h.

  A plurality of peeling prevention grooves 11j that prevent the resin member 12 from being peeled from the partition wall member 11 are formed on the outer peripheral surface of the convex portion 11h. The separation preventing groove 11j is formed in a square groove shape. Further, the peeling preventing groove 11j is formed so as to be inclined with respect to the vertical direction when viewed from a direction orthogonal to the vertical direction. In this embodiment, the separation preventing groove 11j is formed so as to be substantially orthogonal to the vertical direction. Further, the peeling prevention grooves 11j are formed at a constant pitch in the vertical direction, and are formed in almost the entire area of the convex portion 11h excluding a part on the upper end side. Further, the peeling prevention groove 11j is formed in the entire area of the convex portion 11h in the circumferential direction, and both ends of the peeling prevention groove 11j communicate with the rotation prevention groove 11g. Note that a magnetic sensor (not shown) that detects magnetic poles formed on the outer peripheral surface of the driving magnet 14 is provided at the lower end side of some convex portions 11h (three convex portions 11h in the example shown in FIG. 3 and the like). ) Is formed in the cutout portion 11k.

  A peeling preventing portion 31 for preventing the resin member 12 from peeling from the partition wall member 11 is disposed below the flange portion 11d. The peeling prevention part 31 includes a plurality of peeling prevention protrusions 11m protruding downward from the lower surface of the flange part 11d, and a peeling prevention member 32 fixed to the peeling prevention protrusion 11m.

  The peeling prevention protrusions 11m are formed in a stepped columnar shape, and are disposed on the lower surface of the flange portion 11d at a pitch of approximately 90 °. The peeling preventing member 32 is formed in a flat plate shape and an annular shape. The peeling preventing member 32 is fixed to the lower end side of the peeling preventing projection 11m so as to surround the upper end side of the cylindrical portion 11b. The peeling preventing member 32 is fixed to the lower end side of the peeling preventing projection 11m so as to be substantially parallel to the flange 11d, and a gap S is formed between the flange 11d and the peeling preventing member 32. Has been. In this embodiment, for example, the peeling preventing member 32 is fixed to the lower end side of the peeling preventing projection 11m by thermal welding or ultrasonic welding. The peeling preventing member 32 may be fixed to the lower end side of the peeling preventing projection 11m with a screw or an adhesive.

  The resin member 12 is provided to completely cover the drive coil 23 and the substrates 27 and 28 and protect the drive coil 23 and the substrates 27 and 28 from the fluid. The resin member 12 is formed by injecting a resin material onto the partition wall member 11 in a state where the stator 5 and the substrates 27 and 28 are fixed. Specifically, the resin member 12 is formed by placing the partition member 11 to which the stator 5 and the substrates 27 and 28 are fixed in a mold, and injecting a resin material into the mold and curing it. . That is, the resin member 12 is integrally formed with the partition wall member 11 after the stator 5 and the substrates 27 and 28 are fixed.

  The resin member 12 of this embodiment is formed in a substantially bottomed cylindrical shape as a whole, and completely covers the stator 5 and the substrates 27 and 28. The resin member 12 completely covers the cylindrical portion 11b and the bottom portion 11c, and covers the lower surface of the flange portion 11d. A part of the resin member 12 is filled in the gap S between the flange portion 11d and the peeling prevention member 32, and a part of the resin member 12 is arranged in the gap S. Further, at the time of injection molding of the resin member 12, the resin material goes into the gap between the flange portion 25a of the bobbin 25 and the outer peripheral surface of the convex portion 11h and also enters the peeling prevention groove 11j. That is, a part of the resin member 12 is also disposed in the gap between the flange portion 25a of the bobbin 25 and the outer peripheral surface of the convex portion 11h and in the separation preventing groove 11j. As shown in FIG. 1, in this embodiment, the boundary surface between the flange portion 11 d and the resin member 12 appears on the outer peripheral surface of the pump device 1.

(Main effects of this form)
As described above, in this embodiment, the peeling prevention unit 31 for preventing the resin member 12 from peeling from the partition wall member 11 is disposed below the flange portion 11d, and constitutes the peeling prevention unit 31. A part of the resin member 12 is disposed in a gap S formed between the peeling preventing member 32 and the flange portion 11d. Therefore, in this embodiment, the peeling prevention member 32 disposed on the lower side of the flange portion 11d functions as an anchor that prevents the resin member 12 from peeling off from the flange portion 11d. Therefore, in this embodiment, it is possible to effectively prevent the resin member 12 from being peeled from the lower surface of the flange portion 11d by the peel preventing portion 31. As a result, in this embodiment, even if the boundary surface between the flange portion 11d and the resin member 12 appears on the outer peripheral surface of the pump device 1, fluid enters the stator 5 and the substrates 27 and 28 covered with the resin member 12. Can be effectively prevented.

  Further, in this embodiment, a plurality of peeling prevention grooves 11j for preventing the resin member 12 from peeling off from the partition wall member 11 is formed in the convex portion 11h of the partition wall member 11, and a part of the resin member 12 is formed as a peeling prevention groove. 11j. Therefore, in this embodiment, it is possible to more effectively prevent the resin member 12 from being separated from the partition wall member 11 by the separation preventing groove 11j.

  In this embodiment, since the resin member 12 is formed so as to completely cover the substrates 27 and 28, the substrates 27 and 28 also function to prevent the resin member 12 from peeling off from the partition wall member 11.

  In this embodiment, the peeling prevention member 32 is formed in an annular shape, and is fixed to the plurality of peeling prevention protrusions 11m so as to surround the cylindrical portion 11b. Therefore, for example, compared with the case where each of the plurality of separation preventing members is fixed to each of the plurality of separation preventing protrusions 11m, the handling of the separation preventing member 32 at the time of assembling the pump device 1 is facilitated. Further, the number of parts of the pump device 1 can be reduced.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

In the embodiment described above, the peeling preventing member 32 is fixed to the peeling preventing projection 11m. In addition, for example, the annular peeling prevention member 32 may be formed integrally with the peeling prevention protrusion 11m. That is, the peeling preventing member 32 may be formed integrally with the partition wall member 11.

  With the form mentioned above, the peeling prevention member 32 is formed in the annular | circular shape, and is being fixed to the some protrusion 11m for peeling prevention so that the cylindrical part 11b may be enclosed. In other words, in the embodiment described above, the peeling prevention unit 31 includes one peeling prevention member 32. In addition to this, for example, the peeling prevention unit 31 may include a plurality of peeling prevention members.

In this case, the number of separation preventing projections 11m and the number of separation preventing members may be the same, and each of the plurality of separation preventing members may be fixed to each of the plurality of separation preventing projections 11m. For example, an annular washer may be fixed to each of the plurality of peeling prevention protrusions 11m as a peeling prevention member . Further, the number of peeling prevention projections 11m may be the same as the number of peeling prevention members, and each of the plurality of peeling prevention members 11m may be integrally formed with each of the plurality of peeling prevention projections 11m. In this case, for example, a mushroom-shaped projection is formed by the separation preventing projection 11m and the separation preventing member.

  Further, when the peeling preventing portion 31 includes a plurality of peeling preventing members, the number of peeling preventing members is smaller than the number of peeling preventing projections 11m, and one for each peeling preventing projection 11m. The peeling preventing member may be fixed or integrally formed.

  In the embodiment described above, the plurality of separation preventing grooves 11j are formed in the convex portion 11h, but the separation preventing grooves 11j may not be formed in the convex portion 11h. Even in this case, it is possible to obtain the above-described effect that it is possible to effectively prevent the fluid from entering the stator 5 and the substrates 27 and 28 covered with the resin member 12.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Impeller 4 Rotor 5 Stator 9 Pump chamber 11 Bulkhead member 11a Bulkhead 11b Cylindrical part 11c Bottom part 11d Eaves part 11m Protrusion prevention 12 Resin member 31 Peeling prevention part 32 Peeling prevention member S Gap

Claims (2)

An impeller, a rotor to which the impeller is attached, a stator disposed on an outer peripheral side of the rotor, a pump chamber in which the impeller and the rotor are disposed and a fluid passes, and the stator and the pump chamber A partition member having a partition wall arranged between the stator chambers to prevent the fluid in the pump chamber from flowing into the pump, and a resin resin member formed so as to cover the stator;
The partition wall is formed in a substantially bottomed cylindrical shape with a flange having a bottom portion, a cylindrical portion, and a flange portion,
The flange portion is formed so as to spread from the opening side end portion of the cylindrical portion to the outside in the radial direction of the cylindrical portion,
In the axial direction of the cylindrical part, when the side on which the bottom part is arranged is one side,
The resin member is formed so as to cover the bottom portion and the cylindrical portion, and to cover the one side surface of the flange portion,
On one side of the flange portion, a peeling preventing portion for preventing peeling of the resin member from the partition member is disposed ,
The peeling preventing part protrudes from the flange part to the one side and surrounds the cylindrical part and a plurality of peeling preventing protrusions, and surrounds the outer peripheral side of the cylindrical part over the entire circumference. An annular peeling prevention member fixed to the plurality of peeling prevention protrusions,
A gap is formed between the flange and the peeling preventing member,
A part of the resin member is disposed in the gap . The stator includes a stator core,
2. The pump device according to claim 1, wherein when viewed from the axial direction of the cylindrical portion, a part of the separation preventing part and a part of the stator core overlap each other.

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