JP5663265B2 - 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. For example, the retaining protrusion is formed at the center of the bottom of the cylindrical portion. Also, the retaining projection is formed in a cylindrical shape with a hook.

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, the area of the collar portion of the retaining projection formed at the center of the bottom of the cylindrical portion is not large. Therefore, in this pump device, when the mold resin peeling force acts on one of the axial directions of the pump device, which is the peeling direction of the mold resin from the partition plate, the amount of mold resin caught on the flange of the retaining projection Less is. Therefore, in this pump apparatus, the deterrent which suppresses peeling of the mold resin from a partition plate becomes small, and there exists a possibility that peeling of the mold resin from a partition plate cannot fully be prevented.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pump device capable of increasing the deterring force for preventing the resin member covering the stator and the like from being separated from the partition member in which the partition disposed between the stator and the pump chamber is formed. Is to provide.

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 stator includes a driving coil and a stator core formed with a plurality of salient pole portions around which the driving coil is wound, and the partition wall is substantially provided with a hook having a bottom portion, a cylindrical portion, and a flange portion. In the axial direction of the cylindrical part, the resin member is formed to cover the bottom part and the cylindrical part, and to cover the surface of one side of the collar part. Of the cylindrical part The peripheral surface, peeling prevention grooves to prevent peeling of the resin member from the partition member is formed to be inclined with respect to the axial direction of the cylindrical portion when viewed from the direction perpendicular to the axial direction of the cylindrical portion In addition, a plurality of anti-rotation grooves for preventing the stator core from rotating relative to the partition wall member are formed in parallel with the axial direction of the cylindrical portion, and the anti-peeling portion is arranged at the tip side of the salient pole portion in the anti-rotation groove. The groove is formed on the convex portion arranged between the plurality of anti-rotation grooves, and is formed on the entire area of the convex portion in the circumferential direction of the cylindrical portion, and both ends of the peeling prevention groove are anti-rotation grooves. characterized in that it communicates with.

In the pump device of the present invention, a separation preventing groove for preventing the separation of the resin member from the partition member is formed on the outer peripheral surface of the cylindrical portion. Therefore, it is possible to form the separation preventing groove in a relatively wide range in the circumferential direction of the cylindrical portion and in a relatively wide range in the axial direction of the cylindrical portion. Therefore, when the peeling force of the resin member acts on one of the axial directions of the cylindrical portion, which is the peeling direction of the resin member from the partition wall member, it becomes possible to increase the amount of the resin member that is caught in the peeling preventing groove. . As a result, in the present invention, it is possible to increase the deterrence force that suppresses the separation of the resin member from the partition member. In the present invention, a plurality of rotation prevention grooves for preventing the rotation of the stator core relative to the partition wall member are formed on the outer peripheral surface of the cylinder portion in parallel with the axial direction of the cylinder portion. The tip end side of the pole portion is disposed, and the separation preventing groove is formed on the convex portion disposed between the plurality of rotation preventing grooves, and is formed on the entire region of the convex portion in the circumferential direction of the cylindrical portion. Both ends of the prevention groove communicate with the rotation prevention groove. Therefore, when a resin member is formed by performing injection molding on the partition wall member after the stator is fixed, the resin material passes through the rotation prevention groove to the inside of the separation prevention groove during injection molding. This makes it easier for the resin material to enter the groove for preventing peeling. Therefore, when the peeling force of the resin member acts in the peeling direction of the resin member from the partition member, it becomes possible to increase the amount of the resin member caught with respect to the separation preventing groove, and the resin member from the partition member It is possible to effectively increase the deterrence that suppresses peeling.

  In this invention, it is preferable that the peeling prevention groove is formed so as to be orthogonal to the axial direction of the cylindrical portion. If comprised in this way, the peeling force of the resin member which acts on one side of the axial direction of the cylindrical part used as the peeling direction of the resin member from a partition member can be received efficiently by the side surface of the groove | channel for peeling prevention. Therefore, it is possible to effectively increase the deterring force that suppresses the separation of the resin member from the partition member.

  As described above, in the pump device of the present invention, it is possible to increase the deterring force that suppresses the separation of the resin member from the partition 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.

  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.

  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, a plurality of separation preventing grooves 11j are formed on the outer peripheral surface of the convex portion 11h. Specifically, the separation preventing groove 11j is formed in substantially the entire region of the convex portion 11h excluding a part on the upper end side in the vertical direction, and is formed in the entire region of the convex portion 11h in the circumferential direction. . Further, a part of the resin member 12 is disposed in the separation preventing groove 11j. Therefore, in this embodiment, when the peeling force of the resin member 12 acts in the downward direction, which is the peeling direction of the resin member 12 from the partition wall member 11, the amount of the resin member 12 caught on the peeling preventing groove 11j is increased. Is possible. Therefore, in this embodiment, it is possible to increase the deterring force that suppresses the separation of the resin member 12 from the partition wall member 11.

  In particular, in this embodiment, since the peeling preventing groove 11j is formed so as to be substantially orthogonal to the vertical direction, the peeling force of the resin member 12 acting downward is the peeling direction of the resin member 12 from the partition wall member 11. , It can be received efficiently on the side surface of the peeling preventing groove 11j. Therefore, in this embodiment, it is possible to effectively increase the deterring force that suppresses the peeling of the resin member 12 from the partition wall member 11.

  In this embodiment, 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. Therefore, at the time of injection molding of the resin member 12, the resin material easily turns into the peeling prevention groove 11j via the rotation prevention groove 11g, and the resin material easily enters the peeling prevention groove 11g. Therefore, in this embodiment, when the peeling force of the resin member 12 acts in the downward direction, which is the peeling direction of the resin member 12 from the partition wall member 11, the amount of the resin member 12 caught on the peeling preventing groove 11j is increased. As a result, it is possible to effectively increase the deterrence of suppressing the separation of the resin member 12 from the partition wall member 11.

  Further, in this embodiment, a peeling prevention member 32 for preventing the resin member 12 from peeling off from the partition wall member 11 is disposed below the flange portion 11d, and between the peeling prevention member 32 and the flange portion 11d. A part of the resin member 12 is disposed in the gap S formed in the. Therefore, in this embodiment, the peeling preventing member 32 can effectively prevent the resin member 12 from peeling from the lower surface of the flange portion 11d.

  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.

(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 prevention groove 11j is formed so as to be substantially perpendicular to the vertical direction. However, as described above, the peeling prevention groove 11j is formed vertically when viewed from the direction perpendicular to the vertical direction. What is necessary is just to be formed so that it may incline with respect to a direction. For example, the peeling preventing groove 11j is formed to be inclined by 45 ° or more with respect to the vertical direction when viewed from a direction orthogonal to the vertical direction.

  In the embodiment described above, the separation preventing groove 11j is formed in the entire area of the convex portion 11h in the circumferential direction, and both ends of the separation preventing groove 11j communicate with the rotation preventing groove 11g. In addition, for example, the peeling preventing groove 11j may be formed in a part of the convex portion 11h in the circumferential direction. In this case, only one end of the separation preventing groove 11j communicates with the rotation preventing groove 11g, and the other end of the separation prevention groove 11j does not need to communicate with the rotation prevention groove 11g. In this case, both ends of the separation preventing groove 11j do not have to communicate with the rotation preventing groove 11g.

  In the embodiment described above, the peeling preventing groove 11j is formed in substantially the entire area of the convex portion 11h excluding a part on the upper end side in the vertical direction. In addition, for example, the peeling preventing groove 11j may be formed in the entire area of the convex part 11h in the vertical direction, or may be formed in a part of the convex part 11h in the vertical direction. Further, in the embodiment described above, the peeling prevention grooves 11j are formed at a constant pitch in the vertical direction, but the interval between the peeling prevention grooves 11j in the vertical direction may be irregular.

  In the embodiment described above, the peeling prevention unit 31 is disposed below the collar part 11d, but the peeling prevention part 31 may not be disposed below the collar part 11d. Even in this case, it is possible to obtain the effect of the above-described form in which it is possible to increase the deterrence force that suppresses the separation of the resin member 12 from the partition wall member 11.

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 Ridge part 11g Anti-rotation groove 11h Protrusion part 11j Stripping prevention groove 12 Resin member 23 Driving coil 24 Stator core 24b Projection Extreme part

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 through which 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 stator includes a driving coil and a stator core formed with a plurality of salient pole portions around which the driving coil is wound.
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,
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 the outer peripheral surface of the cylindrical portion, a peeling prevention groove for preventing the resin member from peeling from the partition member is formed in the axial direction of the cylindrical portion when viewed from a direction orthogonal to the axial direction of the cylindrical portion. A plurality of anti-rotation grooves for preventing rotation of the stator core with respect to the partition wall member are formed in parallel with the axial direction of the cylindrical portion;
In the rotation preventing groove, a tip side of the salient pole part is disposed,
The separation preventing groove is formed in a convex portion disposed between the plurality of rotation preventing grooves, and is formed in the entire region of the convex portion in the circumferential direction of the cylindrical portion. Both ends of the pump device communicate with the rotation preventing groove . The peeling prevention groove, the pump apparatus according to claim 1, characterized in that it is formed so as to be perpendicular to the axial direction of the cylindrical portion.

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