JP5685414B2 - 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, a driving magnet constituting a rotor is arranged on the inner peripheral side of a cylindrical part constituting the partition plate, and a stator is arranged on the outer peripheral side of the cylindrical part.

  Further, in the pump device described in Patent Document 1, the stator and the substrate are covered with a mold resin in order to prevent fluid from entering the stator and the substrate. This mold resin is formed by injection molding. Specifically, a partition plate in which a stator and a substrate are arranged on the outer peripheral side of a cylindrical portion is placed in a mold, and a resin material is injected into the mold with a predetermined pressure and cured to obtain a mold resin. Is formed.

JP 2008-75462 A

  As described above, in the pump device described in Patent Document 1, the partition plate in which the stator is disposed on the outer peripheral side of the cylindrical portion is disposed in the mold, and the resin material is injected into the mold at a predetermined pressure. The mold resin is formed by injection molding to be cured. Therefore, the relative position of the stator disposed on the outer peripheral side of the cylindrical portion with respect to the partition plate may be shifted due to the pressure of the resin material injected during the injection molding of the mold resin.

  Accordingly, an object of the present invention is to prevent displacement of the relative position of the stator with respect to the partition member in which the partition wall disposed between the stator and the pump chamber is formed at the time of injection molding of the resin member covering the stator or the like. Is to provide a simple pump device.

In order to solve the above problems, a pump device according to the present invention includes an impeller, a rotor to which the impeller is attached, an insulating member that is disposed on the outer peripheral side of the rotor and is made of a driving coil and an insulating material. A stator having a stator core formed with a plurality of salient pole portions around which a drive coil is wound via a conductive member, a pump chamber in which an impeller and a rotor are disposed, and a fluid passing therethrough, and a stator and a pump chamber A partition member having a partition wall disposed between them and preventing a fluid in the pump chamber from flowing into a position where the stator is disposed, and the partition wall is formed in a substantially bottomed cylindrical shape 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, and the insulating member is formed with a contact portion that contacts the flange portion, and at least one of the contact portions. parts are, by ultrasonic welding Rutotomoni is fixed to parts, the contact portion before being ultrasonically welded, a concave portion is formed, the flange portion before being ultrasonically welded convex portion engaged with the concave portion is formed, the recess and Centering on the convex portion, at least a part of the abutting portion and the flange portion are ultrasonically welded .

  In the pump device of the present invention, the insulating member constituting the stator is formed with an abutting portion that abuts on the collar portion constituting the partition wall, and at least a part of the abutting portion is fixed to the collar portion. . That is, in the present invention, the stator is fixed to the partition member. Therefore, in the present invention, even when a predetermined pressure is applied to the stator at the time of injection molding of the resin member that covers the stator or the like, it is possible to prevent the relative position of the stator from shifting relative to the partition wall member.

  In the present invention, for example, the insulating member includes an inner insulating portion disposed inside the stator core in the radial direction, an outer insulating portion disposed outside the stator core in the radial direction, an inner insulating portion, and an outer insulating portion. And a driving coil is wound around the coupling insulating portion, and a contact portion is formed on at least one of the inner insulating portion and the outer insulating portion, and at least of the inner insulating portion and the outer insulating portion. Either one is fixed to the buttocks. In this case, it is preferable that contact portions are formed on the inner insulating portion and the outer insulating portion, and the inner insulating portion and the outer insulating portion are fixed to the flange portion. If comprised in this way, since a stator is fixed to a partition member on the inner side and outer side of the radial direction of a stator core, it becomes possible to raise the fixing strength of the stator with respect to a partition member. Accordingly, it is possible to effectively prevent the displacement of the relative position of the stator with respect to the partition member during the injection molding of the resin member that covers the stator and the like.

  In the present invention, the stator core is constituted by a plurality of divided cores divided for each salient pole part, and the stator includes the same number of insulating members as the number of salient pole parts attached to each of the salient pole parts, It is preferable that a contact portion is formed on each of the insulating members, and each of the plurality of insulating members is fixed to the flange portion. If comprised in this way, even if it is a case where a stator core is comprised by the some division | segmentation core, each of a some division | segmentation core can be fixed to a partition member via an insulating member. Therefore, even when the stator core is composed of a plurality of divided cores, it is possible to prevent a deviation of the relative position of the stator with respect to the partition member during injection molding of a resin member that covers the stator and the like.

  In the present invention, the stator core is constituted by a plurality of divided cores divided for each salient pole part, and the partition wall member is disposed on the outer peripheral side of the cylindrical part, and is a substantially cylindrical outer peripheral wall that rises from the flange part toward the bottom part side. The stator is preferably held between the cylindrical portion and the outer peripheral wall portion. If comprised in this way, even if it is a case where a stator core is comprised by several division | segmentation cores, it will become possible to integrate several division | segmentation cores using an outer peripheral wall part. That is, it becomes possible to integrate a plurality of divided cores by using a partition member for preventing the fluid in the pump chamber from flowing into the place where the stator is disposed. Therefore, even if the stator core is constituted by a plurality of divided cores, the configuration of the pump device can be simplified.

  In the present invention, the outer peripheral surface of the stator core is preferably in contact with the inner peripheral surface of the outer peripheral wall portion with a predetermined contact pressure. That is, the stator core is preferably press-fitted into the outer peripheral wall portion. If comprised in this way, it will become possible to raise the fixed strength of the stator with respect to a partition member. Accordingly, it is possible to effectively prevent the displacement of the relative position of the stator with respect to the partition member during the injection molding of the resin member that covers the stator and the like. Moreover, when comprised in this way, the some division | segmentation core is integrated, for example by press-fitting the some division | segmentation core of the combined state to the inner peripheral side of an outer peripheral wall part, and a some division | segmentation core is made into a partition member It becomes possible to fix to. Therefore, it is possible to simplify the assembly work of the pump device.

  In this case, in order to increase the fixing strength of the stator to the partition member, it is preferable to increase the contact pressure between the outer peripheral surface of the stator core and the inner peripheral surface of the outer peripheral wall portion. On the other hand, when the contact pressure between the outer peripheral surface of the stator core and the inner peripheral surface of the outer peripheral wall portion is too high, it is difficult to press the stator core into the outer peripheral wall portion. In the present invention, since the insulating member constituting the stator is fixed to the flange portion constituting the partition wall member, in order to increase the fixing strength of the stator with respect to the partition wall member, the outer peripheral surface of the stator core and the inner peripheral surface of the outer peripheral wall portion There is no need to make the contact pressure higher than necessary. That is, in the present invention, when the outer peripheral surface of the stator core is in contact with the inner peripheral surface of the outer peripheral wall portion with a predetermined contact pressure, the contact pressure between the outer peripheral surface of the stator core and the inner peripheral surface of the outer peripheral wall portion is reduced. However, it is possible to ensure the fixing strength of the stator with respect to the partition member. Accordingly, the contact pressure between the outer peripheral surface of the stator core and the inner peripheral surface of the outer peripheral wall portion can be reduced, and the press-fitting operation of the stator core to the outer peripheral wall portion can be facilitated.

Further, in the present invention, since at least a portion of the contact portion is fixed to the flange portion by ultrasonic welding, even when the outer peripheral wall portion is formed in the partition wall member, the flange portion, the abutment It is possible to fix the insulating member to the flange by applying the vibration horn to the surface opposite to the surface with which the portion abuts. Therefore, the fixing work of the insulating member to the buttock becomes easy.

In the present invention, the insulating member and the partition member, it is preferably formed of the same material. If comprised in this way, it will become easy to fix an insulating member to a collar part by ultrasonic welding. Therefore, the fixing work of the insulating member to the buttock becomes easy. Moreover, it becomes possible to fix an insulating member to a collar part reliably.

  As described above, in the pump device of the present invention, it is possible to prevent the displacement of the relative position of the stator with respect to the partition member during the injection molding of the resin member that covers the stator and the like.

It is sectional drawing of the pump apparatus concerning embodiment of this invention. It is a disassembled perspective view which shows the state which decomposed | disassembled the stator shown in FIG. 1, a partition member, etc. FIG. It is a perspective view which shows the state by which the drive coil was wound by the division | segmentation core shown in FIG. It is a perspective view of the division | segmentation core shown in FIG. It is sectional drawing of the state by which the stator was fixed to the partition member shown in FIG. It is an enlarged view of the E section of 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. 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 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 pump device 1 also includes a magnetic sensor 20 (see FIG. 2) for detecting magnetic poles formed on the outer peripheral surface of the drive magnet 14.

(Structure of stator)
FIG. 2 is an exploded perspective view showing a state in which the stator 5 and the partition member 28 shown in FIG. 1 are disassembled. FIG. 3 is a perspective view showing a state where the driving coil 23 is wound around the split core 24c shown in FIG. FIG. 4 is a perspective view of the split core 24c shown in FIG.

  The stator 5 includes a drive coil 23, a stator core 24, and an insulating member (insulator) 25 made of an insulating material, 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 28a 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. 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. The stator core 24 is configured by a plurality of divided cores 24c divided for each salient pole portion 24b. The stator core 24 of this embodiment is composed of six divided cores 24c.

  As shown in FIG. 4, the split core 24c includes a salient pole portion 24b and an outer peripheral portion 24d that constitutes a part of the annular portion 24a. The outer peripheral portion 24d is formed in a substantially arc shape. The salient pole part 24b is composed of a salient pole tip part 24e which is the tip part of the salient pole part 24b, and a connecting part 24f connecting the salient pole tip part 24e and the outer peripheral part 24d. The salient pole portion 24b has a substantially T shape. The inner peripheral surface of the salient pole tip 24e is opposed to the outer peripheral surface of the drive magnet 14 via a partition wall 28a described later.

  The insulating member 25 is made of a thermoplastic resin material. The insulating member 25 is integrally formed with the split core 24c. That is, the stator 5 includes the same number of insulating members 25 as the number of salient pole portions 24b, and the insulating members 25 are attached to the respective divided cores 24c. The insulating member 25 covers the outer peripheral side of the salient pole tip portion 24e, the connecting portion 24f, and the inner peripheral side of the outer peripheral portion 24d in order to prevent contact between the driving coil 23 and the split core 24c. Is formed. In addition, as shown in FIGS. 1 and 3, the insulating member 25 includes an inner insulating portion 25a disposed inside in the radial direction, an outer insulating portion 25b disposed outside in the radial direction, and an inner insulating portion 25a. And a connecting insulating portion 25c that connects the outer insulating portion 25b.

  The inner insulating portion 25a is formed so that the shape when viewed in the vertical direction is a substantially arc shape. The inner insulating portion 25a is formed so as to extend from the salient pole tip portion 24e to both sides in the vertical direction. The inner insulating portion 25a covers the other portion of the salient pole tip portion 24e excluding the inner peripheral surface of the salient pole tip portion 24e and both ends in the circumferential direction.

  The outer insulating portion 25b is formed so that the shape when viewed from the up-down direction is a substantially arc shape. The outer insulating portion 25b is formed to extend from the outer peripheral portion 24d to both sides in the vertical direction. The outer insulating portion 25b covers a part of the inner peripheral surface and the upper and lower end surfaces of the outer peripheral portion 24d.

  The connection insulating part 25c is formed in a substantially rectangular tube shape that covers the connection part 24f, and the driving coil 23 is wound around the outer periphery of the connection insulating part 25c. That is, the driving coil 23 is wound around the outer periphery of the connecting portion 24f via the connecting insulating portion 25c. Both ends of the driving coil 23 are entangled with terminal pins 26 fixed to the lower surface of the outer insulating portion 25b.

  The plurality of split cores 24c in a state where the driving coil 23 is wound are combined in a substantially cylindrical shape so that end faces of the outer peripheral portions 24d adjacent in the circumferential direction are in contact with each other, and an outer peripheral wall portion 28b described later Fixed to the inner periphery. At this time, a gap is formed between the end surfaces of the salient pole tip portions 24e adjacent in the circumferential direction, and a gap is also formed between the end surfaces of the inner insulating portions 25a adjacent in the circumferential direction.

(Housing configuration)
FIG. 5 is a cross-sectional view of the state in which the stator 5 is fixed to the partition wall member 28 shown in FIG. FIG. 6 is an enlarged view of a portion E in FIG.

  As shown in FIG. 1, the housing 6 includes a partition member 28 having a partition wall 28 a disposed between the pump chamber 9 and the stator 5 so as to separate the pump chamber 9 and the stator 5, a lower surface of the partition member 28, and And a resin resin member 29 covering the side surface.

  The partition member 28 is formed of a thermoplastic resin material. In this embodiment, the partition member 28 is formed of the same resin material as the insulating member 25. For example, the partition member 28 and the insulating member 25 are made of a resin material such as polyphenylene ether (PPE) or polyphenylene sulfide (PPS). In addition to the partition wall 28a, the partition member 28 includes a substantially cylindrical outer peripheral wall portion 28b disposed on the outer peripheral side of the partition wall 28a.

  The partition wall 28a is formed in a substantially bottomed cylindrical shape with a flange, and includes a cylindrical portion 28c, a bottom portion 28d, and a flange portion 28e. The cylindrical portion 28 c is formed in a cylindrical shape and is disposed so as to cover the outer peripheral surface of the driving magnet 14. The bottom portion 28d is formed in a disc shape that closes the lower end of the cylindrical portion 28c. The flange portion 28e is formed so as to spread radially outward from the upper end portion that is the opening side end portion of the cylindrical portion 28c. As shown in FIG. 1, the inside and the upper side of the partition wall 28a are the pump chamber 9, and the impeller 2 and the rotor 4 are arranged on the inner side and the upper side of the partition wall 28a. The partition wall 28 a functions to prevent the fluid in the pump chamber 9 from flowing into the place where the stator 5 is disposed.

  On the lower surface of the bottom portion 28d, a fixing protrusion 28f for fixing the substrate 30 to the partition member 28 and a positioning protrusion 28g for positioning the substrate 30 are formed. As shown in FIG. 1, the substrate 30 is fixed to the lower surface side of the bottom portion 28d by a screw 31 screwed into the fixing protrusion 28f in a state where the substrate 30 is positioned by the fixing protrusion 28f and the positioning protrusion 28g. A terminal of the magnetic sensor 20 is connected to the substrate 30. In addition, terminal pins 26 are connected to the substrate 30, and current is supplied from the substrate 30 to the driving coil 23. In this embodiment, after the stator 5 is fixed to the partition member 28, the substrate 30 with the magnetic sensor 20 attached thereto is fixed to the bottom portion 28d.

  As shown in FIG. 2, a plurality of convex portions 28h and 28j projecting outward in the radial direction are formed on the outer peripheral surface of the cylindrical portion 28c. In this embodiment, six convex portions 28h and 28j are formed at an equiangular pitch. The convex portions 28h and 28j are formed in an elongated rectangular parallelepiped shape extending in the vertical direction. Of the six protrusions 28h and 28j, the three protrusions 28h are longer in the vertical direction than the remaining three protrusions 28j in the vertical direction. Specifically, the convex portion 28h is formed in the entire region from the upper end to the lower end of the cylindrical portion 28c. On the other hand, the convex portion 28j is formed from the upper end of the cylindrical portion 28c, but is not formed to the lower end of the cylindrical portion 28c.

  The outer peripheral wall portion 28b is formed in a substantially cylindrical shape, and is disposed on the outer peripheral side of the cylindrical portion 28c. The outer peripheral wall portion 28b is formed so as to rise downward from the flange portion 28e. The height (length in the vertical direction) of the outer peripheral wall portion 28b is lower than the height of the cylindrical portion 28c. The inner diameter of the outer peripheral wall portion 28b is larger than the outer diameter of the cylindrical portion 28c, and the stator 5 is disposed between the inner peripheral surface of the outer peripheral wall portion 28b and the outer peripheral surface of the cylindrical portion 28c.

  The inner diameter of the outer peripheral wall portion 28 b is smaller than the outer diameter of the annular portion 24 a of the stator core 24. In the present embodiment, the plurality of divided cores 24c in which the driving coil 23 is wound are press-fitted to the inner peripheral side of the outer peripheral wall portion 28b in a state of being combined in a substantially cylindrical shape. The stator 5 is fixed to the partition member 28, and the outer peripheral surface of the stator core 24 is in contact with the inner peripheral surface of the outer peripheral wall portion 28b with a predetermined contact pressure.

  In a state where the stator 5 is press-fitted into the inner peripheral side of the outer peripheral wall portion 28b, the upper end of the insulating member 25 is in contact with the lower surface of the flange portion 28e as shown in FIG. Specifically, the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b are in contact with the lower surface of the flange portion 28e. At least a part of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b is fixed to the lower surface of the flange portion 28e. In this embodiment, the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b serve as a contact portion 25d that contacts the flange portion 28e, and at least a part of the contact portion 25d is fixed to the flange portion 28e. Yes.

  In this embodiment, at least a part of the contact portion 25d is fixed to the lower surface of the flange portion 28e by ultrasonic welding. When fixing all or part of the contact portion 25d to the lower surface of the flange portion 28e, a vibrating horn is applied to the upper surface of the flange portion 28e with the contact portion 25d being in contact with the lower surface of the flange portion 28e. Then, all or a part of the contact part 25d and the lower surface of the flange part 28e are ultrasonically welded.

  As shown in FIG. 6, for example, a recess 25e having a substantially triangular cross section is formed in the contact portion 25d before ultrasonic welding (that is, the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b). A convex portion 28n having a substantially triangular cross section that engages with the concave portion 25e is formed on the lower surface of the flange portion 28e before being formed and ultrasonically welded. The convex portion 28n is formed around the concave portion 25e and the convex portion 28n. All or a part of the contact portion 25d is welded to the lower surface of the flange portion 28e. Here, the recessed part 25e may be formed in the whole area of the contact part 25d in the circumferential direction, or may be formed in a part of the contact part 25d in the circumferential direction. However, at least one recess 25e is formed in each of the plurality of insulating members 25. That is, at least one concave portion 25e is formed for one salient pole portion 24b (for one divided core 24c). Even if the concave portion 25e is formed in the entire area of the contact portion 25d in the circumferential direction, or even when the concave portion 25e is formed in a part of the contact portion 25d in the circumferential direction, the convex portion The portion 28n is formed in a range corresponding to the formation range of the recess 25e.

  When the stator 5 is fixed to the partition wall member 28, the gap is formed between the end surfaces of the salient pole tip portions 24e adjacent in the circumferential direction and the end surfaces of the inner insulating portions 25a adjacent in the circumferential direction. The convex portions 28h and 28j are disposed in the gap. The convex portions 28h and 28j can be brought into contact with the end face of the salient pole tip portion 24e in the circumferential direction, and function to prevent the stator 5 from rotating with respect to the partition member 28.

  The motor 1 according to this embodiment is a three-phase brushless motor and includes three magnetic sensors 20. In the motor 1, the current supplied to the driving coil 23 is controlled based on the detection result of the magnetic sensor 20. The magnetic sensor 20 is disposed below the convex portion 28j. Moreover, the magnetic sensor 20 is arrange | positioned in the clearance gap formed between the end surfaces of the inner side insulation part 25a adjacent in the circumferential direction.

  The resin member 29 is provided to completely cover the drive coil 23, the substrate 30, and the like and to protect the drive coil 23, the substrate 30 and the like from the fluid. The resin member 29 is formed by injecting a resin material onto the partition member 28 in a state where the stator 5 and the substrate 30 are fixed. Specifically, the partition member 28 in a state where the stator 5 and the substrate 30 are fixed is disposed in a mold, and a resin material is injected into the mold at a predetermined pressure and cured, whereby the resin member 29 is formed. Is formed. That is, the resin member 29 is integrally formed with the partition wall member 28 after the stator 5 and the substrate 30 are fixed. In this embodiment, the resin member 29 is formed in a substantially bottomed cylindrical shape, and completely covers the partition wall member 28 excluding the upper surface and side surfaces of the flange portion 28e, the lower end portion of the stator 5, and the substrate 30. .

(Main effects of this form)
As described above, in the present embodiment, the outer peripheral wall portion 28b is formed on the partition wall member 28, and the plurality of divided cores 24c around which the driving coil 23 is wound are combined in a substantially cylindrical shape. The split core 24c is integrated by being press-fitted into the inner peripheral side of the outer peripheral wall portion 28b. That is, in this embodiment, the plurality of divided cores 24 c are integrated using the partition member 28 for preventing the fluid in the pump chamber 9 from flowing into the place where the stator 5 is disposed. Therefore, in this embodiment, even if the stator core 24 is configured by a plurality of divided cores 24c, it is not necessary to separately provide a member for integrating the plurality of divided cores 24c, and the configuration of the pump device 1 Can be simplified.

  In this embodiment, the divided cores 24c are integrated and fixed to the partition wall member 28 by being press-fitted into the inner peripheral side of the outer peripheral wall portion 28b in a state where the plurality of divided cores 24c are combined in a substantially cylindrical shape. Therefore, the fixing operation of the stator core 24 to the partition member 28 is facilitated. The stator core 24 is press-fitted on the inner peripheral side of the outer peripheral wall portion 28b, and the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b are in contact with each other with a predetermined contact pressure. The fixing strength of the stator 5 can be increased. Therefore, in this embodiment, even when pressure is applied to the stator 5 fixed to the partition wall member 28 during the injection molding of the resin member 29, it is possible to prevent the relative position of the stator 5 from being shifted with respect to the partition wall member 28.

  Here, in order to prevent the displacement of the relative position of the stator 5 with respect to the partition wall member 28 during the injection molding of the resin member 29, the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b is increased. Thus, it is preferable to increase the fixing strength of the stator 5 with respect to the partition member 28. On the other hand, when the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b is too high, it is difficult to press the stator core 24 into the outer peripheral wall portion 28b.

  However, in this embodiment, at least a part of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b of the insulating member 25 constituting the stator 5 is fixed to the lower surface of the flange portion 28e. Therefore, even if the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b is reduced, the fixing strength of the stator 5 with respect to the partition member 28 can be ensured. That is, in this embodiment, it is possible to ensure the fixing strength of the stator 5 with respect to the partition member 28 while reducing the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b. Therefore, in this embodiment, it is possible to facilitate the press-fitting operation of the stator core 24 while preventing the displacement of the relative position of the stator 5 with respect to the partition wall member 28 during the injection molding of the resin member 29.

  Further, in this embodiment, at least a part of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b of the insulating member 25 is fixed to the lower surface of the flange portion 28e, and the stator 5 is positioned on the inner side and the outer side in the radial direction. It is fixed to the partition member 28. Therefore, the fixing strength of the stator 5 with respect to the partition member 28 can be further increased. Therefore, in this embodiment, even if the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b is further reduced, the relative position of the stator 5 with respect to the partition wall member 28 during the injection molding of the resin member 29 is reduced. A shift can be prevented.

  In this embodiment, at least one recess 25e is formed in each of the plurality of insulating members 25, and at least with respect to one salient pole portion 24b (that is, with respect to one divided core 24c). One recess 25e is formed. Therefore, even if the stator core 24 is configured by a plurality of divided cores 24c, each of the plurality of divided cores 24c can be fixed to the flange portion 28e via the insulating member 25. Therefore, in this embodiment, even when the stator core 24 is configured by a plurality of divided cores 24c, the contact pressure between the outer peripheral surface of the stator core 24 and the inner peripheral surface of the outer peripheral wall portion 28b is further reduced, and the resin It is possible to prevent displacement of the relative position of the stator 5 with respect to the partition wall member 28 at the time of injection molding of the member 29.

  In the present embodiment, at least a part of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b are fixed to the lower surface of the flange portion 28e by ultrasonic welding. Therefore, even when the outer peripheral wall portion 28b is formed on the partition wall member 28, the insulating member 25 can be fixed to the flange portion 28e by applying a vibration horn to the upper surface of the flange portion 28e. Therefore, in this embodiment, the fixing work of the insulating member 25 to the flange portion 28e is facilitated.

  In this embodiment, the insulating member 25 and the partition member 28 are formed of the same material. Therefore, it becomes easy to fix the insulating member 25 to the flange portion 28e by ultrasonic welding. Therefore, in this embodiment, the fixing work of the insulating member 25 to the flange portion 28e is facilitated. Further, in this embodiment, the insulating member 25 can be reliably fixed to the flange portion 28e.

(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, all or part of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b are fixed to the lower surface of the flange portion 28e. In addition, for example, all or a part of only one of the upper end of the inner insulating portion 25a and the upper end of the outer insulating portion 25b may be fixed to the lower surface of the flange portion 28e. In this case, since it is not necessary to match the position of the upper end of the inner insulating portion 25a with the position of the upper end of the outer insulating portion 25b in the vertical direction, the insulating member 25 can be easily formed. In this case, in order to increase the fixing strength of the stator 5 with respect to the partition member 28, it is preferable that all or part of only the upper end of the outer insulating portion 25b is fixed to the lower surface of the flange portion 28e.

  In the embodiment described above, the stator core 24 is constituted by a plurality of divided cores 24c. In addition to this, for example, the stator core 24 is an integral core constituted by a substantially annular ring portion 24a formed integrally and a plurality of salient pole portions 24b projecting radially inward from the ring portion 24a. It may be. In this case, the driving coil 23 wound around the bobbin serving as the insulating member is inserted into the salient pole portion 24b from the radially inner side together with the bobbin and fixed to the stator core 24. In this case, a contact portion that contacts the flange portion 28e is formed on the bobbin, and at least a part of the contact portion is fixed to the flange portion 28e.

  In the embodiment described above, the outer peripheral wall portion 28 b is formed on the partition wall member 28, but the outer peripheral wall portion 28 b may not be formed on the partition wall member 28. In this case, for example, the plurality of divided cores 24c are integrated by a predetermined coupling member. Even in this case, since the insulating member 25 is fixed to the flange portion 28e (that is, because the stator 5 is fixed to the partition wall member 28), the partition wall member 28 at the time of the injection molding of the resin member 29 is performed. This makes it possible to prevent the relative position of the stator 5 from being shifted. Further, even when the stator core 24 is an integral core, the outer peripheral wall portion 28 b may not be formed on the partition wall member 28. Even in this case, as described above, since the bobbin as the insulating member is fixed to the flange portion 28e (that is, the stator 5 is fixed to the partition wall member 28), the injection of the resin member 29 is performed. It is possible to prevent displacement of the relative position of the stator 5 with respect to the partition wall member 28 during molding.

  In the embodiment described above, the insulating member 25 is fixed to the flange portion 28e by ultrasonic welding, but the insulating member 25 may be fixed to the flange portion 28e by adhesion. When only the upper end of the outer insulating portion 25b is fixed to the flange portion 28e, and the outer peripheral wall portion 28b is not formed on the partition wall member 28, the upper end of the outer insulating portion 25b is fixed to the flange portion 28e by heat welding. It may be fixed to. In the embodiment described above, the insulating member 25 and the partition member 28 are formed of the same resin material, but the insulating member 25 and the partition member 28 may be formed of different resin materials.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Impeller 4 Rotor 5 Stator 9 Pump chamber 23 Driving coil 24 Stator core 24b Salient pole part 24c Divided core 25 Insulating member 25a Inner insulating part 25b Outer insulating part 25c Connection insulating part 25d Contact part 28 Bulkhead member 28a Partition wall 28b Outer peripheral wall portion 28c Cylindrical portion 28d Bottom portion 28e Gutter portion

Claims (7)

An impeller, a rotor to which the impeller is attached, an insulating member made of a driving coil and an insulating material and disposed on the outer peripheral side of the rotor, and the driving coil wound around the insulating member A stator core having a plurality of salient pole portions formed thereon, a pump chamber in which the impeller and the rotor are arranged and fluid passes, and a stator chamber disposed between the stator and the pump chamber. A partition member having a partition wall for preventing the fluid in the pump chamber from flowing into the arrangement place,
The partition is formed in a substantially bottomed cylindrical shape 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,
The insulating member is formed with a contact portion that contacts the flange portion,
Wherein at least a portion of said abutment part is fixed to the collar portion by ultrasonic welding Rutotomoni,
A concave portion is formed in the contact portion before ultrasonic welding,
A convex part that engages with the concave part is formed on the collar part before being ultrasonically welded,
The pump device , wherein at least a part of the contact portion and the flange portion are ultrasonically welded around the concave portion and the convex portion . The insulating member connects the inner insulating portion disposed on the radially inner side of the stator core, the outer insulating portion disposed on the radially outer side of the stator core, and the inner insulating portion and the outer insulating portion. A connecting insulation part,
The driving coil is wound around the connection insulating portion,
The contact portion is formed in at least one of the inner insulating portion and the outer insulating portion, and at least one of the inner insulating portion and the outer insulating portion is fixed to the flange portion. The pump device according to claim 1.   The pump device according to claim 2, wherein the contact portion is formed on the inner insulating portion and the outer insulating portion, and the inner insulating portion and the outer insulating portion are fixed to the flange portion. The stator core is constituted by a plurality of divided cores divided for each salient pole part,
The stator includes the same number of the insulating members as the number of salient pole parts attached to each of the salient pole parts,
The contact portion is formed on each of the plurality of insulating members, and each of the plurality of insulating members is fixed to the flange portion. Pump device. The stator core is constituted by a plurality of divided cores divided for each salient pole part,
The partition member includes a substantially cylindrical outer peripheral wall portion arranged on the outer peripheral side of the cylindrical portion and rising from the flange portion toward the bottom side,
The pump device according to claim 1, wherein the stator is held between the cylindrical portion and the outer peripheral wall portion.   The pump device according to claim 5, wherein an outer peripheral surface of the stator core is in contact with an inner peripheral surface of the outer peripheral wall portion with a predetermined contact pressure. It said insulating member and said partition wall member, a pump device according to any of claims 1 to 6, characterized in that it is formed of the same material.

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