JP2016003580A - Pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump device which inhibits peeling between a sealing part, which is resin molded so as to cover a stator, and a division wall member with a structure realized at low costs.SOLUTION: A pump device includes: a division wall member 11 which divides a pump chamber, in which a rotor is disposed, from a stator; and a sealing part 12 which is resin molded so as to cover the stator. Peeling prevention parts 31 are formed at a flange part 11c of the division wall member 11. Each peeling prevention part 31 includes: a protruding part 32 protruding downward from the flange part 11c; and holes 33 which are formed in the protruding part 32 so as to leave a wall part 34 facing the flange part 11c. The hole 33 opens in a direction intersecting with an axis line L. Thus, the sealing part 12 covers the lower side of the flange part 11c and the stator and includes anchor parts penetrating into the holes 33.

Description

  The present invention relates to a pump device in which a partition member for preventing fluid from flowing in between a pump chamber and a stator.

  Some pump devices have a partition member disposed between a pump chamber and a stator to prevent inflow of fluid. In this type of pump device, a structure in which the stator is covered with a mold resin and sealed is proposed (see Patent Document 1). When adopting such a configuration, in order to shorten the tact time, if the molded product is taken out from the mold before the mold resin (sealing part) is cooled to the inside, the sealing will occur as the members constituting the stator contract. There is a possibility that the sealing portion may be peeled off from the joint surface between the stopper and the partition member.

  Therefore, in the pump device described in Patent Document 1, a protrusion is provided on the joint surface of the partition member with the sealing portion, and the ring-shaped separation preventing member is fixed by the protrusion, and the partition member and the separation preventing member are interposed between the separation member and the separation preventing member. A structure has been proposed in which an anchor is formed by inserting a mold resin to prevent separation between the partition wall member and the sealing portion.

JP 2012-92763 A

  However, in the configuration described in Patent Document 1, since the partition wall member and the peeling prevention member are separate members, an assembly process of the peeling prevention member is required. Accordingly, there is a problem that the time required for the process before molding increases, the tact time increases, and the cost increases.

  In view of the above-described problems, an object of the present invention is to provide a pump device that can suppress peeling between a sealing portion resin-molded so as to cover a stator and a partition member with a configuration that can be realized at low cost. There is.

  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, an annular stator disposed on the radially outer side of the rotor, the impeller, and the rotor. Is disposed, a resin partition member separating the stator from the pump chamber, and a sealing part resin-molded so as to cover the stator, the partition member including the stator and A cylindrical portion extending in the axial direction between the rotor, a flange portion extending radially outward from an end of the cylindrical portion on one side where the impeller is located in the axial direction, and the axial direction A bottom portion that closes the opening of the cylindrical portion on the other side of the flange portion, and a peeling prevention portion that is integrally molded with the flange portion on the other side of the flange portion, and the peeling prevention portion includes the flange portion. To other A projecting portion protruding to the side, and a hole formed in the projecting portion and opened in a direction intersecting the axial direction, leaving a wall portion facing the other side of the flange portion, and the sealing The stop portion includes an anchor portion that covers the other side of the flange portion and the stator and enters the inside of the hole.

According to the present invention, when the sealing portion is resin-molded so as to cover the stator, a part of the resin enters the hole of the convex portion formed in the flange portion of the partition wall member to constitute the anchor portion. The convex portion engages with the wall portion facing the flange portion. For this reason, after the stator covered with the sealing portion is taken out of the mold, even if the member constituting the stator contracts during the cooling time, the sealing portion peels off from the partition wall member to form a gap. Can be suppressed. Therefore, it is possible to suppress a fluid such as water from entering the stator through the gap between the sealing portion and the partition member. Moreover, since the peeling prevention part is integrally formed with the flange part of the partition wall member, the number of parts can be reduced and a process of attaching the peeling prevention part to the partition wall member is unnecessary. Therefore, it is possible to suppress the separation between the sealing portion resin-molded so as to cover the stator and the partition member with a configuration that can be realized at low cost.

  In the present invention, the hole may be configured to open in the radial direction.

  In this invention, it is preferable that the said hole has penetrated the said convex part to radial direction. According to such a configuration, when the sealing portion is resin-molded so as to cover the stator, a part of the resin smoothly enters the hole to constitute the anchor portion. Even when the radial dimension of the convex portion is narrow, the overlapping area between the anchor portion and the wall portion of the convex portion is large, so that the engagement force between the wall portion and the anchor portion is large. Therefore, even if the member constituting the stator contracts during the time when the sealing portion is cooled, it is possible to reliably suppress the sealing portion from being separated from the partition member and forming a gap.

  In the present invention, the hole preferably has a circumferential dimension on the flange portion side larger than a circumferential dimension on the opposite side to the flange portion. According to such a configuration, since the strength of the wall portion is high, even if the member constituting the stator contracts during the time when the sealing portion is cooled, it is possible to avoid a situation such as the wall portion being broken. it can.

  In this invention, it is preferable that the said hole is provided with the internal peripheral surface curved on the opposite side to the said flange part. According to such a configuration, since the strength of the wall portion is high, even if the member constituting the stator contracts during the time when the sealing portion is cooled, it is possible to avoid a situation such as the wall portion being broken. it can.

  In the present invention, it is preferable that a plurality of the holes are formed apart from each other in the circumferential direction, and the plurality of holes are opened in directions parallel to each other. According to such a configuration, even when a plurality of holes are formed, the sliding direction of the split core disposed in the undercut shape portion (hole) can be unidirectional during resin molding of the partition wall member. It can be simplified.

  In the present invention, at any position in the projecting direction of the convex portion, the sum of the circumferential dimensions of the connecting portion connecting the wall portion and the flange portion in the convex portion is the circumferential dimension of the hole. Preferably it is greater than the sum. According to such a configuration, since the strength of the connecting portion is large, it is possible to avoid a situation in which the connecting portion is broken even if the member constituting the stator contracts during the time when the sealing portion is cooled. it can.

  In the present invention, it is preferable that the convex portion and a part of the stator overlap when viewed from the axial direction. According to such a configuration, the radial size of the sealing portion, that is, the radial size of the pump device can be reduced.

  In the present invention, it is preferable that the convex portion and a part of the stator overlap when viewed from the radial direction. According to such a configuration, the axial size of the pump device can be reduced.

In this invention, when it sees from the said axial direction, it is preferable that the said convex part is extended in circular arc shape along the outer peripheral surface of the said stator. According to such a configuration, the radial size of the sealing portion, that is, the radial size of the pump device can be reduced even when the circumferential length of the convex portion is long.

  In this invention, it is preferable that the said peeling prevention part is completely covered with the said sealing part. According to such a configuration, since the boundary between the sealing portion and the peeling preventing portion is not exposed to the outside, it is possible to greatly reduce the risk of fluid (water or the like) entering from the boundary.

  In the present invention, it is possible to employ a configuration in which the peeling preventing portion is provided at two locations located on the opposite side in the radial direction with the cylindrical portion as a center. According to such a configuration, the inflow direction of the resin and the longitudinal direction of the two peeling preventing portions can be made substantially parallel. Therefore, the ease of injection molding of the sealing portion can be enhanced to improve the molding quality, and both the facilitation of the molding process and the improvement of the peeling prevention effect can be achieved.

  In this invention, it has a case member screwed to the said partition member, This case member comprises the said pump chamber with the said partition member, The penetration for screwing the said case member to the said flange part It is preferable that a hole is provided and the peeling preventing portion and the through hole are arranged at an angular position that does not overlap in the circumferential direction with respect to the axis. According to such a configuration, since it is not necessary to separate the separation preventing portion and the screwing position in the radial direction, the radial size of the sealing portion, that is, the radial size of the pump device can be reduced.

  According to the present invention, when the sealing portion is resin-molded so as to cover the stator, a part of the resin enters the convex portion formed in the flange portion of the partition wall member to form the anchor portion, and the anchor portion is The portion engages with the wall portion facing the flange portion. For this reason, after removing the stator covered with the sealing portion from the mold, the sealing portion peels off from the partition wall member due to contraction of the member constituting the stator during the cooling time, and a gap is formed. Can be suppressed. Therefore, it is possible to suppress a fluid such as water from entering the stator through the gap between the sealing portion and the partition member. Moreover, since the peeling prevention part is integrally formed with the flange part of the partition wall member, the number of parts can be reduced and a process of attaching the peeling prevention part to the partition wall member is unnecessary. Therefore, it is possible to suppress the separation between the sealing portion resin-molded so as to cover the stator and the partition member with a configuration that can be realized at low cost.

It is explanatory drawing of the pump apparatus to which this invention is applied. It is the decomposition explanatory view which looked at the stator etc. of the pump device to which the present invention is applied from the upper side. It is the decomposition explanatory view which looked at the stator etc. of the pump device to which the present invention is applied from the lower side. It is sectional drawing of the pump apparatus to which this invention is applied. It is the perspective view which looked at the board | substrate etc. of the pump apparatus to which this invention is applied from the lower side. It is explanatory drawing of the peeling prevention part formed in the partition member of the pump apparatus to which this invention is applied. It is explanatory drawing which shows the modification of the peeling prevention part of the pump apparatus to which this invention is applied.

  Hereinafter, a pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, for convenience of explanation, the upper and lower parts of the pump device will be described according to the upper and lower parts of FIGS. In this case, one side in the axis L direction (Z1 direction side) corresponds to the upper side, and the other side in the axis L direction (Z2 direction side) corresponds to the lower side.

(Schematic configuration of the pump device)
FIG. 1 is an explanatory view of a pump device 1 to which the present invention is applied, and FIGS. 1A and 1B are a perspective view and an exploded perspective view of the pump device 1. 2 is an exploded explanatory view of the pump device 1 to which the present invention is applied as seen from above, and FIGS. 2 (a) and 2 (b) are exploded explanatory views in a state where the stator and the partition member are overlapped. FIG. 6 is an exploded explanatory view of a state where a stator and a partition member are separated from each other. 3 is an exploded explanatory view of the stator of the pump device 1 to which the present invention is applied as viewed from below, and FIGS. 3A and 3B are exploded explanatory views in a state where the stator and the partition member are overlapped. FIG. 5 is an exploded explanatory view of a state where a stator and a partition member are separated from each other. FIG. 4 is a cross-sectional view of the pump device 1 to which the present invention is applied.

  The pump apparatus 1 shown in FIGS. 1-4 is a type of pump called a can pump, and can be used for various uses, such as a hot water supply system and pressurization of toilet washing water. The pump device 1 includes an impeller 2 and a motor 3 such as a DC brushless motor that rotates the impeller 2. The motor 3 includes a rotor 4 and a stator 5. The impeller 2 and the motor 3 are arranged inside a case body constituted by a housing 6 and a case member (hereinafter referred to as an upper case 7) that covers the 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. Between the housing 6 and the upper case 7, a pump chamber 9 (not shown in FIGS. 1 to 3) through which the fluid sucked from the suction portion 7a passes toward the discharge portion 7b is formed. In addition, a sealing member 10 such as an O-ring that secures the sealability 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 disposed so as to separate the pump chamber 9 and the stator 5 and a resin sealing portion 12 covering the lower surface and side surfaces of the partition member 11. The sealing part 12 consists of BMC (Bulk Molding Compound). Such BMC is a thermosetting material in which a glass fiber or the like is blended as a reinforcing material in a matrix in which an unsaturated polyester resin is a main component and a thermoplastic polymer as a low shrinkage agent, a curing agent, a filler, and a release agent are uniformly mixed. Made of molding material. The partition member 11 constitutes a pump chamber 9 together with the upper case 7, and the seal member 10 seals the joint portion between the partition member 11 and the upper case 7. The upper case 7 may be composed of a plurality of members instead of a single member. A detailed configuration of the housing 6 will be described later.

  As shown in FIG. 4, the rotor 4 includes a driving magnet 14, a cylindrical sleeve 15, and a holding member 16 that holds the driving magnet 14 and the sleeve 15. The holding member 16 includes an annular flange portion 16a provided at the upper end thereof, and a cylindrical portion 16b connected to the lower side of the flange portion 16a and formed coaxially with the flange portion 16a. The drive magnet 14 is fixed to the outer peripheral side of the cylindrical portion 16b, and the sleeve 15 is fixed to the inner peripheral side of the cylindrical portion 16b. The impeller 2 is fixed on the upper side of the flange portion 16a. The impeller 2 and the rotor 4 are disposed inside the pump chamber 9.

  The rotor 4 is rotatably supported by a fixed shaft 17 disposed in the pump chamber 9. The fixed shaft 17 is arranged with the vertical direction as the axial direction. The fixed shaft 17 is inserted through the inner peripheral side of the sleeve 15. In addition, two thrust bearing members 181 and 182 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 of the rotor 4, and the sleeve 15 and the thrust bearing members 181 and 182 function as thrust bearings of the rotor 4. The upper end of the fixed shaft 17 protrudes from the upper thrust bearing member 181 and is held by the upper case 7. The lower end of the fixed shaft 17 protrudes from the lower thrust bearing member 182 and is held by the bottom 11 b of the partition wall member 11.

The stator 5 includes a driving 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 arranged on the outer side in the radial direction of the rotor 4, and the arrangement location of the stator 5 and the arrangement location of the rotor 4 (pump chamber 9) are separated by a partition wall member 11.

  2 and 3, 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 ring portion 24a. The plurality of salient pole portions 24 b are arranged at an equiangular pitch in the circumferential direction of the stator 5.

  The bobbin 25 is formed of an insulating material such as a resin, and a cylindrical portion 25c into which the salient pole portion 24b is fitted, and an inner flange portion 25a that extends at a right angle to the cylindrical portion 25c at the radially inner end portion of the cylindrical portion 25c. And an outer flange portion 25b extending at a right angle to the cylindrical portion 25c at the radially outer end of the cylindrical portion 25c.

  The driving coil 23 shown in FIG. 4 is wound around the outer peripheral surface of the cylindrical portion 25 c of the bobbin 25. The driving coil 23 is connected to a terminal pin (not shown) fixed to 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. Therefore, the drive coil 23 is wound around the salient pole portion 24 b via the bobbin 25. The drive coil 23 is electrically connected to a substrate 27 disposed below the stator 5 and the partition member 11. The stator 5 and the substrate 27 constitute a conductive part 30 of the motor 3.

(Schematic structure of the partition member 11)
The partition wall member 11 is formed to extend from the cylindrical portion 11a extending in the axis L direction of the rotor 4 and the one end (upper end) in the axis L direction of the cylindrical portion 11a to the outside in the radial direction of the cylindrical portion 11a. The flange portion 11c and the bottom portion 11b that closes the opening on the other side in the axis L direction of the cylindrical portion 11a are provided. The partition member 11 is disposed so that the cylindrical portion 11a covers the driving magnet 14 of the rotor 4 from the outside in the radial direction. In this state, as shown in FIG. 4, the inside and the upper side of the cylindrical portion 11a 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 cylindrical portion 11a. The cylindrical portion 11a and the bottom portion 11b serve to prevent the fluid in the pump chamber 9 from flowing into the place where the stator 5 is disposed.

  A substrate 27 is placed on the lower surface (surface in the Z2 direction) of the bottom portion 11b of the partition wall member 11 in an overlapping manner. In addition, a plurality of protrusions 11e for supporting the substrate 27 are formed on the lower surface of the bottom portion 11b, and the substrate 27 is fixed by screws 29 fixed to one protrusion 11e while being positioned by the protrusions 11e. Has been.

  The outer shape of the flange portion 11c viewed from the direction of the axis L is substantially rectangular, and through holes 11m for screwing the upper case 7 to the flange portion 11c with screws 8 are formed at the four corners. Further, a protruding portion 11n that protrudes in a curved shape toward the outside is formed at the central portion of each side of the flange portion 11c. An annular recess 11p is formed on the lower surface of the flange portion 11c (the surface on the cylindrical portion 11a side) on the radially outer side of the cylindrical portion 11a, and on the radially outer side of the annular recess 11p than on the inner peripheral side portion. An annular groove 11q recessed by one step is formed.

  A plurality of anti-rotation grooves 11g are formed on the outer peripheral surface of the cylindrical portion 11a. The rotation preventing groove 11g has a square groove shape and is formed in parallel with the axis L. Further, the rotation preventing groove 11g is formed at an equal angular pitch in the circumferential direction of the cylindrical portion 11a, and the tip end side of the salient pole portion 24b is arranged in the groove of the rotation preventing groove 11g. Thereby, rotation of the stator core 24 with respect to the partition member 11 is prevented. A portion between adjacent rotation preventing grooves 11g is a convex portion 11h protruding outward in the radial direction.

(Configuration of substrate 27 etc.)
5 is a perspective view of the substrate 27 and the like of the pump device 1 to which the present invention is applied as viewed from below. FIGS. 5A, 5B, and 5C show the bobbin 25 and the substrate 27 on the partition wall member 11. FIG. 2 is a perspective view of a state in which the substrate 27 is removed, a perspective view of a state in which the substrate 27 is removed from the partition member 11, and a perspective view of a state in which the bobbin 25 and the substrate 27 are removed from the partition member 11. FIG.

  As shown in FIG. 4, a gap is formed between the outer peripheral surface of the cylindrical portion 11 a and the inner flange portion 25 a of the bobbin 25, and the sensor element 271 supported by the substrate 27 is disposed in the gap. ing. Specifically, as shown in FIGS. 4 and 5, a driving IC 272 is mounted on the lower surface of the substrate 27, and three lead wire type sensor elements 271 are provided on the upper surface side of the substrate 27. Has been implemented. The sensor element 271 includes a lead wire 271a extending upward from the substrate 27 and a hall element 271b configured at the upper end of the lead wire 271a. The hall element 271b includes the outer peripheral surface of the cylindrical portion 11a and the bobbin 25. It arrange | positions between the inner side collar parts 25a.

  In such a structure, after mounting the stator 5 on the cylindrical portion 11 a of the partition wall member 11, the Hall element 271 b is inserted between the outer peripheral surface of the cylindrical portion 11 a and the inner flange portion 25 a of the bobbin 25 when the substrate 27 is disposed. . At this time, when the Hall element 271b contacts the inner flange 25a, the lead wire 271a is bent, and the position of the Hall element 271b is shifted. Therefore, in this embodiment, the inner flange portion 25a is formed to protrude downward from the cylindrical portion 11a, and the inner flange portion 25a is used as a guide for the Hall element 271b, while the outer peripheral surface of the cylindrical portion 11a and the inner side of the bobbin 25 are used. A Hall element 271b is inserted between the flange 25a. For this reason, it can prevent that the lead wire 271a bends.

(Configuration of peeling prevention unit 31)
FIGS. 6A and 6B are explanatory views of the separation preventing portion 31 formed in the partition wall member 11 of the pump device 1 to which the present invention is applied. FIGS. 6A and 6B are a side view of the partition wall member 11 and the partition wall member. It is the bottom view which looked at 11 from the lower side.

  As shown in FIG. 6, a peeling prevention portion 31 for preventing peeling of the sealing portion 12 from the partition wall member 11 is formed on the lower surface of the flange portion 11 c on the radially outer side of the annular groove 11 q. . The peeling prevention portions 31 are provided at two locations located on the opposite side in the radial direction with respect to the axis L. Moreover, the peeling prevention part 31 is arrange | positioned on the basis of the axis line L in the angular position which does not overlap with the above-mentioned through-hole 11m in the circumferential direction. In this embodiment, the two peeling preventing portions 31 are formed in a symmetrical shape with respect to the axis L. The partition wall member 11 is a member in which the cylindrical portion 11a, the bottom portion 11b, and the flange portion 11c are integrally formed by resin molding, including the separation preventing portion 31, and therefore, the separation preventing portion 31 is resin molded from the flange portion 11c. Are integrally formed.

  In this embodiment, each of the two peeling preventing portions 31 has a convex portion 32 that protrudes downward from the lower surface of the flange portion 11c (the same side as the cylindrical portion 11a), and a hole 33 formed in the convex portion 32. The hole 33 opens in a direction intersecting the axis L direction, leaving a wall portion 34 facing the flange portion 11c on the lower side. In this embodiment, when viewed from the direction of the axis L, the convex portion 32 extends in an arc shape along the outer peripheral surface of the stator 5 and the protruding portion 11n between the annular groove 11q and the protruding portion 11n. . The hole 33 penetrates the convex portion 32 in the radial direction, and opens to the radially outer side and the radially inner side. A plurality of holes 33 are formed apart from each other in the circumferential direction.

In this embodiment, the circumferential dimension W1 of the hole 33 is larger on the flange portion 11c side (upper side) than on the opposite side (lower side) of the flange portion 11c. In this embodiment, the hole 33 has an inner peripheral surface that is curved on the opposite side to the flange portion 11c. Here, a plurality of holes 33 are formed apart from each other in the circumferential direction, and the plurality of holes 33 are opened in directions parallel to each other. For this reason, even when a plurality of holes 33 are formed, the sliding direction of the split core disposed in the undercut shape portion (hole 33) can be set to one direction when the partition member 11 is molded with resin. It can be simplified. At any position in the protruding direction of the convex portion 32, the sum of the circumferential dimension W2 of the connecting portion 35 that connects the wall portion 34 and the flange portion 11c in the convex portion 32 is the circumferential dimension W1 of the hole 33. Is greater than the sum of

  As can be seen from FIG. 4, when the peeling preventing portion 31 is viewed from the direction of the axis L, the convex portion 32 and a part of the stator 5 overlap each other. Further, when viewed from the radial direction, the convex portion 32 and a part of the stator 5 overlap each other.

(Configuration of sealing portion 12)
1 to 4 is made of a resin material insert-molded together with the conductive portion 30 (the stator 5 and the substrate 27), and completely covers the conductive portion 30 (the stator 5 and the substrate 27). Thereby, the sealing part 12 is protecting the drive coil 23 of the stator 5, the board | substrate 27, etc. from the fluid. In this embodiment, a connector 27a for external connection is attached to one end of the substrate 27, and the connecting portion of the connector 27a with the substrate 27 is completely covered by the sealing portion 12. An end portion of the connector 27a opposite to the substrate 27 protrudes from the sealing portion 12 to form a joint portion with the mating connector in the radial direction. For this reason, the wiring from the outside can be connected to the connector 27a. Electronic components such as a driving IC 272 and sensor element 271 (Hall element 271b), a lead wire drawn out from the driving coil 23, a connector 27a, and the like are joined to the substrate 27 by soldering. It is configured to cover not only electronic components and conductive wires, but also the surface of the solder.

  The sealing portion 12 is formed by injecting a resin material such as BMG resin to the partition member 11 to which the stator 5 and the substrate 27 are fixed. Specifically, the sealing member 12 is formed by placing the partition member 11 to which the stator 5 and the substrate 27 are fixed in a mold, and injecting a resin material into the mold and curing the resin material. That is, the sealing portion 12 is integrally formed with the partition wall member 11 after the stator 5 and the substrate 27 are fixed.

  The sealing portion 12 covers the cylindrical portion 11a of the partition wall member 11, and covers the lower surface side of the bottom portion 11b to the inside in the radial direction from the edge of the protruding portion 11n. For this reason, the sealing part 12 has completely covered the flange part 11c and the peeling prevention part 31. FIG. Therefore, when the sealing portion 12 is resin-molded, a part of the resin enters the hole 33 of the peeling preventing portion 31 to constitute the anchor portion 12e shown in FIG. In addition, the edge part of the overhang | projection part 11n is an insert holding part exposed without being covered with the sealing part 12. FIG. Such a portion is used to hold the partition member 11 with respect to the mold when the sealing portion 12 is molded.

  Here, since the sealing part 12 is provided only on the cylindrical part 11a side of the flange part 11c, a boundary surface between the flange part 11c and the sealing part 12 is provided on the lower surface of the flange part 11c. For this reason, as shown in FIG. 1, the boundary surface between the flange portion 11 c and the sealing portion 12 is exposed on the outer peripheral surface of the pump device 1.

The sealing portion 12 configured in this manner includes a substantially cylindrical main body portion 12a covering the stator 5 and the substrate 27, and a screw fixing portion 12b protruding outward in the radial direction from four locations on the outer peripheral surface of the main body portion 12a. I have. The four screw fixing portions 12b overlap with the through holes 11m formed at the four corners of the flange portion 11c in the vertical direction, and are provided at equal angular intervals in the circumferential direction corresponding to the arrangement of the through holes 11m. Each screw fixing portion 12b extends in the vertical direction with a length that completely covers the tip portion of the screw 8 that protrudes downward (Z2 direction) through the through hole 11m. Each screw fixing portion 12b has a fixing hole 12d in which a tip portion of the screw 8 screwed to the through hole 11m is screwed and fixed. A screw 8 for screwing the partition member 11 and the upper case 7 is a tapping screw. The screw 8 is screwed into the through hole (not shown) of the upper case 7 and the through hole 11m of the flange portion 11c from the upper case 7 side, and the tip thereof is screwed and fixed to the fixing hole 12d in the screw fixing portion 12b.

  The sealing part 12 after injection molding is integrally formed with a protruding part 12c that protrudes from the side surface of the main body part 12a. The protruding portion 12c is formed at a portion where a resin inflow port (gate) is provided in a mold used when the sealing portion 12 is molded, and a gate mark remains on the surface thereof. The attachment position of the connector 27a with respect to the partition member 11 is set at a position equiangularly spaced in the circumferential direction from the two peeling preventing portions 31. And the formation position of the protrusion part 12c is set to the opposite side (position rotated 180 degree | times from the connector 27a on the basis of the axis line L) in the radial direction of the attachment position of the connector 27a. That is, the arrangement of each part is set so that the direction (X1 direction in FIG. 2) from the protruding part 12c to the connector 27a is orthogonal to the direction connecting the centers of the two peeling preventing parts 31 in the circumferential direction.

  Such an arrangement is an arrangement in which the longitudinal direction of each peeling prevention part 31 can be oriented along the resin inflow direction around the peeling prevention part 31. In this embodiment, the partition wall member 11 and the members (the stator 5, the substrate 27, etc.) disposed in the mold together with the partition member 11 are arranged such that the resin inflow direction (X3 direction in FIG. 2) and the axis of the cylindrical portion 11a While being orthogonal to the L direction, it can be arranged in the mold so that the direction from the protruding portion 12c to the connector 27a coincides with the inflow direction (X3 direction) of the resin material. When arranged in this way, the resin inflow direction around each peeling prevention portion 31 is a direction along the longitudinal direction of the convex portion 32. Thereby, arrangement | positioning which the peeling prevention part 31 does not prevent the inflow of a resin material as much as possible is implement | achieved.

(Main effects of this form)
As described above, in the pump device 1 of this embodiment, when the sealing portion 12 is resin-molded so as to cover the conductive portions 30 such as the stator 5 and the substrate 27, a part of the resin is the flange portion 11 c of the partition wall member 11. The anchor portion 12e is formed by entering the hole 33 of the convex portion 32 formed in the above, and the anchor portion 12e engages with the wall portion 34 facing the flange portion 11c in the convex portion 32. For this reason, after the stator 5 covered with the sealing portion 12 is taken out of the mold, the sealing portion 12 is peeled off from the partition wall member 11 even if the member constituting the stator 5 contracts during the cooling time. Thus, the formation of a gap can be suppressed. Therefore, it is possible to prevent fluid such as water from entering the conductive portion 30 such as the stator 5 through the gap between the sealing portion 12 and the partition wall member 11. Further, since the sealing portion 12 may be cooled after being taken out from the mold, the tact time can be shortened accordingly. Moreover, since the peeling prevention part 31 is integrally formed with the flange part 11c of the partition wall member 11, the number of parts can be reduced, and a process of attaching the peeling prevention part 31 to the partition wall member 11 is unnecessary. Therefore, it is possible to suppress separation between the sealing portion 12 and the partition member 11 that are resin-molded so as to cover the conductive portion 30 such as the stator 5 with a configuration that can be realized at low cost.

  Moreover, the hole 33 has penetrated the convex part 32 to radial direction. For this reason, when the sealing portion 12 is resin-molded so as to cover the stator 5 and the like, a part of the resin smoothly enters the hole 33 to constitute the anchor portion 12e. Even when the radial dimension of the convex portion 32 is narrow, the overlapping area between the anchor portion 12e and the wall portion 34 of the convex portion 32 is large, so that the engagement force between the wall portion 34 and the anchor portion 12e is large. Further, a plurality of 33 are formed apart in the circumferential direction. For this reason, the engagement force between the wall portion 34 and the anchor portion 12e is large. Therefore, even if the member which comprises the stator 5 shrink | contracts during the time which cools the sealing part 12, it suppresses reliably that the sealing part 12 peels from the partition member 11, and a clearance gap is formed. Can do.

  Moreover, the hole 33 has a larger dimension in the circumferential direction on the flange portion 11c side than a dimension in the circumferential direction on the opposite side to the flange portion 11c. For this reason, the strength of the wall 34 is high. In particular, since the hole 33 includes an inner peripheral surface that is curved on the opposite side to the flange portion 11c, the strength of the wall portion 34 is large. Therefore, even if the member which comprises the stator 5 shrink | contracts during the time which cools the sealing part 12, the situation where the wall part 34 breaks can be avoided.

  At any position in the protruding direction of the convex portion 32, the sum of the circumferential dimension W2 of the connecting portion 35 that connects the wall portion 34 and the flange portion 11c in the convex portion 32 is the circumferential dimension W1 of the hole 33. Therefore, the strength of the connecting portion 35 is large. For this reason, even if the member which comprises the stator 5 shrink | contracts during the time which cools the sealing part 12, the situation where the connection part 35 breaks can be avoided.

  Moreover, since the convex part 32 and a part of stator 5 have overlapped when it sees from the axis line L direction, the size of the radial direction of the sealing part 12, ie, the size of the radial direction of the pump apparatus 1, can be small. Moreover, since the convex part 32 and a part of stator 5 have overlapped when it sees from radial direction, the size of the axial direction L of the pump apparatus 1 can be made small.

  Further, when viewed from the direction of the axis L, the convex portion 32 extends in an arc shape along the outer peripheral surface of the stator 5. For this reason, even when the circumferential length of the convex portion 32 is long, the radial size of the sealing portion 12, that is, the radial size of the pump device 1 can be reduced.

  Moreover, since the peeling prevention part 31 is completely covered with the sealing part 12, the boundary part of the sealing part 12 and the peeling prevention part 31 is not exposed outside. For this reason, the possibility of fluid (water or the like) entering from the boundary can be greatly reduced.

  Moreover, since the peeling prevention part 31 is provided in two places located on the opposite side of radial direction centering on the cylindrical part 11a, the inflow direction of resin and the longitudinal direction of the two peeling prevention parts 31 are made substantially parallel. be able to. Therefore, the ease of injection molding of the sealing portion 12 can be improved to improve the molding quality, and both the facilitation of the molding process and the improvement of the peeling prevention effect can be achieved.

  Further, a through hole 11m for screwing the upper case 7 to the flange portion 11c of the partition wall member 11 is arranged at an angular position that does not overlap with the peeling preventing portion 31 in the circumferential direction with respect to the axis L of the cylindrical portion 11a. Yes. Therefore, the through hole 11m can be arranged on the inner peripheral side, and the flange portion 11c can be downsized. Moreover, the thick part (screw fixing | fixed part 12b) of the sealing part 12 for screwing in the screw 8 (tapping screw) which fixes the partition member 11 and the upper case 7 with a screw can be provided inside radial direction. Therefore, the sealing part 12 can be reduced in size, which is advantageous for downsizing the pump device. Moreover, the upper case 7 and the partition member 11 can be assembled with high accuracy by screwing the upper case 7. Thereby, the precision of the pump chamber 9 can be improved.

  Further, a through hole 11m for screwing the upper case 7 to the flange portion 11c of the partition wall member 11 is arranged at an angular position that does not overlap with the peeling preventing portion 31 in the circumferential direction with respect to the axis L of the cylindrical portion 11a. Therefore, the peeling prevention part 31 can be arrange | positioned near the outer edge of the flange part 11c. For this reason, the effect which prevents that the sealing part 12 tends to peel from the partition member 11 is large.

  Furthermore, since the sealing part 12 is arrange | positioned only at the cylindrical part 11a side of the flange part 11c, the edge part of the flange part 11c can be used as an insert holding part. Therefore, the shape of the partition member 11 can be simplified.

(Other embodiments)
The above embodiment is an example of a preferred embodiment of the present invention, but is not limited to this. For example, as shown in FIG. 7, various modifications can be made without departing from the scope of the present invention. is there.

  FIG. 7 is an explanatory view showing a modification of the separation preventing unit 31 of the pump device 1 to which the present invention is applied. In the above embodiment, a plurality of holes 33 are formed in the convex portion 32. However, as shown in FIG. 7A, a configuration in which one hole 33 is formed in the convex portion 32 may be used. Moreover, in the said embodiment, although the hole 33 did not reach to the edge part on the opposite side to the flange part 11c of the convex part 32, as shown to FIG. As long as the part 34 remains, the hole 33 may reach the end of the convex part 32 opposite to the flange part 11c, and the convex part 32 may be divided in the circumferential direction.

Although illustration is omitted, if the hole 33 is open in the direction intersecting the axis L, the hole 33 is bottomed without penetrating the convex portion 32, or the hole 33 is circumferential. It may be configured to open. Here, when the hole 33 is bottomed, it may be configured to open on either the radially inner side or the radially outer side. Further, in the above embodiment, the peeling preventing portion 31 (the convex portion 32) is formed in an arc shape. However, the peeling preventing portion 31 is formed in a straight line and extends in parallel with the inflow direction of the resin from the gate mark A (X3 direction in FIG. 2). An existing configuration may be used. In any case, it is preferable to arrange the peeling prevention part 31 so as not to disturb the outer peripheral side of the sealing part 12 and the flow of the resin.
In the above embodiment, the peeling prevention portions 31 are provided at two positions located on the opposite sides in the radial direction with respect to the axis L, but the peeling prevention portions 31 are respectively provided between the through holes 11m and the through holes 11m adjacent in the circumferential direction. It may be provided. In this case, four peeling prevention portions 31 are provided.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Impeller 3 Motor 4 Rotor 5 Stator 6 Housing 7 Upper case 9 Pump chamber 11 Partition member 11a Cylindrical part 11b Bottom part 11c Flange part 12 Sealing part 14 Driving magnet 15 Sleeve 17 Fixed shaft 23 Driving coil 24 Stator core 25 Bobbin 27 Substrate 30 Conductive part 31 Peeling prevention part 32 Convex part 33 Hole 34 Wall part 35 Connection part

Claims (13)

Impeller,
A rotor to which the impeller is attached;
An annular stator disposed radially outside the rotor;
A pump chamber in which the impeller and the rotor are disposed;
A resin partition member separating the stator from the pump chamber;
A sealing part resin-molded to cover the stator;
Have
The partition member extends in the axial direction between the stator and the rotor, and extends radially outward from the end of the cylindrical portion on one side where the impeller is positioned in the axial direction. A flange portion to be closed, a bottom portion that closes the opening of the cylindrical portion on the other side in the axial direction, and a peeling prevention portion integrally molded with the flange portion on the other side of the flange portion,
The peeling prevention portion is formed on the convex portion projecting from the flange portion to the other side and the convex portion, and intersects the axial direction, leaving a wall portion facing the flange portion on the other side. A hole opened in a direction,
The said sealing part is provided with the anchor part which covered the said other side and the said stator of the said flange part, and entered the inside of the said hole, The pump apparatus characterized by the above-mentioned.   The pump device according to claim 1, wherein the hole is opened in a radial direction.   The pump device according to claim 2, wherein the hole penetrates the convex portion in a radial direction.   The pump device according to claim 3, wherein the hole has a circumferential dimension on the flange portion side that is larger than a circumferential dimension on the opposite side of the flange portion.   The pump device according to claim 4, wherein the hole includes an inner peripheral surface that is curved on a side opposite to the flange portion. A plurality of the holes are formed apart in the circumferential direction,
The pump device according to any one of claims 3 to 5, wherein the plurality of holes are opened in directions parallel to each other.   At any position in the protruding direction of the convex portion, the sum of the dimensions in the circumferential direction of the connecting portion connecting the wall portion and the flange portion in the convex portion is larger than the sum of the circumferential dimensions of the holes. The pump device according to claim 3, wherein the pump device is provided.   The pump device according to any one of claims 1 to 7, wherein when viewed from the axial direction, the convex portion and a part of the stator overlap each other.   The pump device according to any one of claims 1 to 8, wherein when viewed from the radial direction, the convex portion and a part of the stator overlap each other.   10. The pump device according to claim 1, wherein when viewed from the axial direction, the convex portion extends in an arc shape along the outer peripheral surface of the stator. 11.   The pump device according to any one of claims 1 to 10, wherein the peeling preventing portion is completely covered with the sealing portion.   The pump device according to any one of claims 1 to 11, wherein the peeling preventing portion is provided at two positions located on opposite sides in the radial direction with the cylindrical portion as a center. A case member screwed to the partition member;
The case member constitutes the pump chamber together with the partition member,
A through hole for screwing the case member to the flange portion is provided,
The pump device according to any one of claims 1 to 12, wherein the separation preventing portion and the through hole are arranged at an angular position that does not overlap in a circumferential direction with respect to the axis.

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