JP5941368B2 - Cascade pump device - Google Patents

Description

  The present invention relates to a cascade pump device in which a drive coil for driving an impeller is sealed with a potting agent.

  An eddy current type cascade pump device has been proposed as a small pump device that pumps a refrigerant for cooling electronic components such as a CPU. The cascade pump device described in Patent Document 1 is a pump case, an annular pump chamber that is configured inside the pump case, a rotor that includes an annular impeller disposed in the pump chamber, and a rotor that rotates. And a substrate for supplying electric power to the drive coil. On the outer surface of the pump case, a recess is provided coaxially with the pump chamber in a portion on the inner peripheral side of the pump chamber, and a stator is accommodated in the recess. Further, a potting agent such as resin is poured into the recess, and the stator is sealed with the potting agent. The board | substrate is arrange | positioned above the recessed part opening, and has covered the stator sealed with the potting agent from upper direction. The stator is securely fixed to the pump case by sealing the potting agent.

JP 2009-156242 A

  In the cascade pump device, the substrate and the stator may resonate during the pump operation. Therefore, in the cascade pump device of Patent Document 1, it is conceivable that the substrate is also sealed with a potting agent to secure its fixation and prevent resonance. Here, in order to cover the substrate with the potting agent, the case is provided with a frame portion surrounding the opening of the concave portion, the substrate is arranged in the space inside the frame portion, and the potting agent is filled in the inner portion of the frame portion and the concave portion. A configuration can be employed. In addition, since it is necessary to connect wiring for supplying power to the drive coil from the outside to the substrate, a part of the frame part is cut out to provide a wiring outlet, and the inside of the frame part through the wiring outlet. It is possible to adopt a configuration in which a wiring placement portion for placing wiring drawn out from the outside is provided. Furthermore, a configuration including a sealing member that seals the wiring outlet in a state where the wiring is sandwiched between the wiring mounting portion so that the potting agent to be filled does not leak out from the wiring outlet to the outside of the frame portion. Can be adopted.

  Further, in the case of adopting such a configuration, the sealing member is a member wider than the opening width of the wiring outlet, and a pair of frames facing both ends of the sealing member in the width direction with the wiring outlet interposed therebetween If it is provided with a pair of notch grooves that fit into the end portion, the sealing member is attached to the case by a simple operation of fitting the sealing member into the frame end portion from the mounting direction along the height direction of the frame portion. In addition, the wiring outlet can be sealed in a state where the wiring is sandwiched between the sealing member and the wiring mounting portion. Furthermore, if the peripheral edge of the front end surface in the mounting direction is chamfered at each frame end portion, the edge of the chamfered front end surface is sealed as a guide surface when the sealing member is fitted into the frame end portion from the mounting direction. The member can be fitted into each frame end portion, and the sealing of the wiring outlet by the sealing member is facilitated.

  However, if chamfering is applied to the peripheral edge of the front end surface of the frame end portion in order to facilitate the blockage of the wiring outlet by the sealing member, the chamfering will occur when the sealing member is fitted into the frame end portion and attached to the case. A groove is formed between the slope formed on the peripheral edge of the front end surface of the frame end portion and the inner wall surface of the cutout groove of the sealing member. As a result, there is a problem that the potting agent poured into the inside of the frame portion leaks through the groove due to capillary action.

  In view of the above problems, an object of the present invention is to provide a potting agent for sealing a drive coil and the like while facilitating the sealing of the wiring outlet of the wiring electrically connected to the driving coil. An object of the present invention is to provide a cascade pump device that can prevent leakage from the device.

  In order to solve the above-mentioned problems, the present invention provides a recess for storing a drive coil for driving an impeller, a frame portion surrounding the opening of the recess, a wiring outlet provided by cutting out the frame portion, and A case having a wiring placement portion for placing wiring drawn from the inside of the frame portion to the outside through the wiring outlet, and attached to the case from a mounting direction along the height direction of the frame portion; A sealing member that seals the wiring outlet in a state where the wiring is sandwiched between the wiring mounting portion, and a sealing agent that is poured into the concave portion and the frame portion and hardened. The sealing member is wider than the opening width of the wiring outlet, and is fitted to a pair of frame end portions facing each other across the wiring outlet at both end edges in the width direction. Notch grooves are provided, and each frame end part is in front of the mounting direction. The peripheral edge of the surface includes a first edge portion that is chamfered and a second edge portion that is not chamfered, and a groove is formed between the first edge portion and the sealing member, The second edge and the sealing member are in close contact with each other.

  According to the present invention, the sealing member that seals the wiring outlet formed by cutting out the frame portion is a member wider than the opening width of the wiring outlet, and is opposed to both ends of the width direction across the wiring outlet. A pair of notch grooves fitted to a pair of frame end portions are provided. Accordingly, the wiring outlet can be sealed by sandwiching the wiring between the sealing member and the wiring placement portion by a simple operation of fitting the sealing member into the frame end portion from the mounting direction along the height direction of the frame portion. In addition, since the first edge portion is chamfered on the peripheral edge of the front end surface in the mounting direction of each frame end portion, the first end of the front end surface is fitted when the sealing member is fitted into the frame end portion from the mounting direction. The sealing member can be fitted into each frame end portion using the edge as a guide surface. Therefore, it becomes easy to block the wiring outlet by the blocking member. Here, when the peripheral edge of the front end surface of the frame end portion is the first edge portion that has been chamfered over the entire circumference, when the sealing member is fitted into the frame end portion and attached to the case, the first edge portion and Since a groove is formed between the sealing members (between the first edge and the inner wall surface portion of the notch groove facing the first edge), the groove communicates the inside and the outside of the frame portion. The potting agent poured into the inside of the part may leak through the groove due to capillary action. However, the peripheral edge of the front end surface of the frame end portion is provided with a second edge portion that is not chamfered, and this second edge portion is in close contact with the sealing member and is between the first edge portion and the sealing member. The groove formed in is divided. As a result, even when the potting agent poured into the inside of the frame part is transmitted through the groove by capillary action, the potting agent is blocked in the middle, so that leakage of the potting agent can be prevented.

  In the present invention, the periphery of the front end surface of each frame end portion is composed of an outer periphery portion on the outside of the frame portion, an inner periphery portion on the inside of the frame portion, and an intermediate periphery portion on the wiring outlet side. Preferably, the outer peripheral edge part and the intermediate peripheral edge part are the first edge part, and the second edge part is provided on the inner peripheral edge part. In this way, even when the potting agent is transmitted through the groove, the potting agent can be dammed inside the frame portion.

  In the present invention, it is preferable that the second edge portion is provided in a portion facing the end portion in the width direction of the sealing member in the inner peripheral edge portion. In this way, the potting agent can be prevented from entering the groove.

  In the present invention, the blocking member includes a thick portion on one side in the groove width direction of the notch groove, and includes a thin portion on the other side having a height in the mounting direction lower than the thick portion, The thick wall portion is disposed inside the frame end portion, the thin wall portion is disposed outside the frame end portion, and the height of the thick wall portion is determined when the sealing member is attached to the case. The height of the thin portion is lower than the first edge when the sealing member is attached to the case, and the height of the thin portion is lower than the first edge portion. Can employ a configuration in which a fixing mechanism for fixing the sealing member to the case is provided. In this way, a fixing structure for fixing the sealing member to the case using the fixing mechanism can be configured without protruding from the frame portion in the mounting direction. It is possible to prevent the dimension from increasing in the mounting direction.

  In this invention, it has a board | substrate arrange | positioned inside the said frame part, and at least one part is embedded in the said sealing agent with the said drive coil, The one end of the said wiring is connected to the said drive coil through the said board | substrate. It is desirable that In this way, since the substrate can be fixed to the case by the sealant, it is possible to prevent the substrate from resonating with the pump operation of the cascade pump device and generating noise.

  In this case, the substrate includes a coil joint portion that is electrically joined to an end portion of the coil wire of the drive coil on a surface opposite to the side where the drive coil is located, and the coil joint portion includes: It is desirable to be embedded in the sealant. If it does in this way, the rust of the coil junction part of a board | substrate can be prevented with a sealing agent.

  According to the present invention, when the sealing member that seals the wiring outlet formed by cutting out the frame portion is attached to the frame end portion, the first edge portion that is chamfered on the peripheral edge of the front end surface of the frame end portion is provided. Since it is provided, it is easy to install. In addition, the front end surface of the frame end portion is not chamfered over the entire periphery, but a part of the periphery is a second edge that is not chamfered. Even if a groove is formed between the one edge portion and the sealing member, this groove is divided by the second edge portion, and the groove does not connect the inside and the outside of the frame portion. Therefore, the potting agent poured into the inside of the frame portion does not leak through the groove due to capillary action.

It is a perspective view of the cascade pump device to which the present invention is applied. It is the longitudinal cross-sectional view and partial expanded sectional view of the cascade pump apparatus to which this invention is applied. It is a disassembled perspective view of the cascade pump apparatus to which this invention is applied. It is a perspective view of a rotor and a stator. It is a perspective view of a lower case. It is a perspective view of an upper case. It is a perspective view of a sealing member. It is the elements on larger scale around the wiring extraction part. It is the top view and sectional view of a wiring extraction part, and sectional drawing of the vicinity of a wiring extraction part.

  Hereinafter, a cascade pump device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, for the convenience of description, the upper and lower parts of the cascade pump device will be described according to the upper and lower parts of FIG. Further, the side from which the suction pipe and the discharge pipe protrude (the right side in FIG. 2A) is the front side of the cascade pump apparatus, the opposite side is the rear side, and the arrangement direction of the suction pipe and the discharge pipe is the apparatus width direction. To do. In addition, the left and right sides of the cascade pump device when viewed from the front side, that is, when the cascade pump device is viewed from the front side, the side where the suction pipe is located is left and the side where the discharge pipe is located is right. Will be explained.

(overall structure)
FIG. 1A is a perspective view of a cascade pump device to which the present invention is applied as viewed from the front obliquely above, and FIG. 1B is a perspective view of the cascade pump device as viewed from obliquely below the rear. The cascade pump device 1 of this embodiment is a vortex pump that pumps a liquid such as a refrigerant. The cascade pump device 1 includes a flat quadrangular prism-shaped pump case 2 as a whole. The pump case 2 is made of resin and is made of PPS (polyphenylene sulfide) or the like. From the front surface 2 a of the pump case 2, the suction pipe 3 and the discharge pipe 4 protrude parallel to the front. A wiring lead for taking out the lead wire 5 from the inside of the pump case 2 is provided at the front left corner portion 2b between the front surface 2a of the pump case 2 and the side surface adjacent to the front surface 2a in the clockwise direction when viewed from above. Part 6 is provided. The lead wire 5 is drawn diagonally forward from a midway position in the axis L direction (height direction) of the cascade pump device 1 via the wiring extraction portion 6. A connector 7 is attached to the tip of the lead wire 5. The wiring extraction portion 6 includes a sealing member 8 attached to the pump case 2 from above in the axis L direction (mounting direction).

  In the pump case 2, the rear right corner portion 2 c located diagonally to the wiring extraction portion 6 rotates relative to the lower case 11 and the upper case 12 as shown in FIG. An anti-rotation mechanism 9 is provided to prevent this. Further, a case fixing portion 10 protruding from the front surface 2 a is provided between the suction pipe 3 and the discharge pipe 4 of the pump case 2. The pump case 2 includes a lower case 11 and an upper case (case) 12 that are stacked one above the other.

(Internal structure)
Fig.2 (a) is a longitudinal cross-sectional view of the cascade pump apparatus 1 in the XX line of Fig.1 (a). 2A passes through the rotation center of the rotor 16 and the impeller 18 described later. FIG. 2B is a partially enlarged sectional view around the shaft fitting hole 35 described later. FIG. 3 is an exploded perspective view of the cascade pump device 1. 4A is a perspective view of the rotor, and FIG. 4B is a perspective view of the stator.

  As shown in FIGS. 2 and 3, the lower case 11 and the upper case 12 are laminated so as to partially overlap in a direction orthogonal to the axis L. A compartment 15 sealed by the lower case 11 and the upper case 12 is formed between the lower case 11 and the upper case 12 except for the suction pipe 3 and the discharge pipe 4. A rotor 16 and a shaft 17 that rotatably supports the rotor 16 are disposed in the compartment 15. The rotor 16 includes an annular impeller 18 at an outer peripheral end portion, and a drive magnet 19 is mounted on the inner peripheral side of the impeller 18. Here, the outer peripheral side portion of the partition chamber 15 is an annular pump chamber 20, and an impeller 18 is inserted into the pump chamber 20.

  Between the lower case 11 and the upper case 12, an O-ring 21 for preventing fluid leakage from the compartment 15 is disposed. A stator 22 and a substrate 23 are mounted on the upper side of the upper case 12, that is, on the side opposite to the compartment 15 of the upper case 12 (the side opposite to the lower case 11). The stator 22 includes a drive coil 24 and a stator core 25. The substrate 23 is for supplying power to the drive coil 24, and the drive coil 24 and the drive magnet 19 constitute a magnetic drive mechanism for rotationally driving the rotor 16 (the impeller 18).

  On the bottom surface (lower surface) and the ceiling surface (upper surface) of the pump chamber 20, a liquid channel 26 is formed over a predetermined angular range around the axis L. More specifically, a lower fluid passage 26 a made of an arc groove having a semicircular cross-sectional shape is formed on the bottom surface of the pump chamber 20 defined by the lower case 11, and is defined by the upper case 12. On the ceiling surface of the pump chamber 20, an upper fluid flow path 26 b made of an arc groove having a semicircular cross-sectional shape is formed. The lower fluid channel 26a and the upper fluid channel 26b overlap when viewed from the direction of the axis L. In this example, the liquid channel 26 is formed over an angle range exceeding 270 ° around the axis L.

  In the pump chamber 20, a suction port 3 a (see FIG. 5) through which the suction pipe 3 communicates is provided at a portion of the lower case 11 where one end of the liquid channel 26 is located. The part of the lower case 11 where the is located is provided with a discharge port 4a (see FIG. 5) through which the discharge pipe 4 communicates. A portion located between the suction port 3a and the discharge port 4a on the bottom surface of the pump chamber 20 is a lower blocking portion 27a in which the lower fluid flow path 26a is not provided. Similarly, a portion located between the suction port 3a and the discharge port 4a on the ceiling surface of the pump chamber 20 is an upper blocking portion 27b in which the upper fluid flow path 26b is not provided.

  The shaft 17 is made of metal and is made of stainless steel in this example. The upper end portion of the shaft 17 is press-fitted and fixed in a shaft press-fit fixing hole 30 provided in the center portion of the upper case 12. More specifically, a central projecting portion (supporting portion) 33 including a cylindrical cylindrical portion 31 and a bottom portion 32 that closes the upper end of the cylindrical portion 31 is provided in the central portion of the upper case 12. A shaft press-fit fixing hole 30 is provided at the center of the bottom surface 32a facing the lower side (the lower case 11 side) inside the cylindrical portion 31 at the bottom portion 32. The shaft 17 is press-fitted into the shaft press-fit fixing hole 30 and fixed in a state along the axis L. In a state where the shaft 17 is press-fitted into the shaft press-fit fixing hole 30, a gap S <b> 1 is formed between the upper end surface of the shaft 17 and the bottom surface of the shaft press-fit fixed hole 30.

  A lower end portion of the shaft 17 is fitted into a shaft fitting hole 35 provided in the lower case 11. Here, the inner diameter dimension of the shaft fitting hole 35 is such a dimension that the shaft 17 can be received without being press-fitted. When the lower end portion of the shaft 17 is fitted into the shaft fitting hole 35, the shaft fitting is performed. A very small clearance is formed between the circular inner peripheral surface of the hole 35 and the circular outer peripheral surface of the shaft 17. In a state where the lower end portion of the shaft 17 is fitted in the shaft fitting hole 35, a gap S <b> 2 is formed between the lower end surface of the shaft 17 and the bottom surface of the shaft fitting hole 35.

  As shown in FIG. 2B, the outer peripheral edge of the lower end surface of the shaft 17 is chamfered over the entire circumference. That is, a tapered shaft-side guide surface (first guide surface) 36 whose diameter dimension decreases toward the tip is provided on the outer peripheral edge of the lower end surface of the shaft 17. In addition, a tapered fitting hole side guide surface 37 whose diameter dimension increases toward the upper side (upper case 12 side) is provided at the opening edge of the shaft fitting hole 35. Here, the depth dimension of the shaft fitting hole 35 is shallower than the depth dimension of the shaft press-fitting fixing hole 30, and the press-fitting allowance dimension N 0 to be press-fitted into the shaft press-fitting fixing hole 30 in the shaft 17 is the shaft fitting in the shaft 17. It is set to be longer than the dimension N1 of the fitting allowance fitted into the joint hole 35. The length of the shaft 17 is such that the lower end portion of the shaft 17 can be fitted into the shaft fitting hole 35 even when the upper end surface of the shaft 17 is in contact with the bottom surface of the shaft press-fit fixing hole 30. It is a length dimension.

  The rotor 16 is made of a resin made of PPS or the like, and as shown in FIG. 4A, the disk portion 40, a cylindrical bearing portion 41 protruding upward from the center of the upper surface of the disk portion 40, and the disk portion. A cylindrical cylindrical portion 42 that protrudes upward from the upper surface of 40 and that surrounds the bearing portion 41 coaxially with a predetermined distance from the bearing portion 41 is provided. The predetermined interval between the bearing portion 41 and the cylindrical portion 42 is an interval at which the stator 22 can be received therebetween via the upper case 12. The rotor 16 can be rotated around the axis L of the shaft 17 in a state where the shaft 17 is inserted into the center hole of the bearing portion 41 and the bearing portion 41 is disposed inside the central projecting portion 33 of the upper case 12. Is done. Here, one or a plurality of washers 43 are inserted between the bearing portion 41 and the bottom portion 32 of the central projecting portion 33, and the position of the rotor 16 in the axis L direction is adjusted by the insertion of the washers 43. (See FIGS. 2 and 3).

  A cylindrical yoke 44 is held on the inner peripheral surface of the cylindrical portion 42, and a cylindrical drive magnet 19 is held on the inner peripheral surface of the yoke 44. The yoke 44 is formed integrally with the rotor 16 by insert molding, and the drive magnet 19 is bonded and fixed to the yoke 44. In the disk part 40, the outer peripheral part of the outer peripheral side of the cylindrical part 42 is an impeller 18. In the state where the lower case 11 and the upper case 12 are laminated and the rotor 16 is disposed in the compartment 15, the impeller 18 is lower than the shaft press-fit fixing hole 30 of the upper case 12 in the axis L direction. 11 near the shaft fitting hole 35.

  Concave portions 45 formed in two upper and lower stages are formed in the outer peripheral portion of the impeller 18 at equal angular intervals in the circumferential direction. The concave portion 45 includes an upper concave portion 46 formed by cutting out the peripheral edge of the upper surface of the disk portion 40 in an arc shape, and a lower concave portion 47 formed by cutting out the peripheral edge of the lower surface of the disk portion 40 in an arc shape. Between the recesses 45 adjacent in the circumferential direction, there are blades 48 extending in the radial direction. Between the upper and lower recesses 46 and 47 adjacent in the vertical direction are ribs 49 that extend in the circumferential direction and divide the blades 48 in the vertical direction. The upper concave portion 46 and the lower concave portion 47 are symmetric with respect to a plane perpendicular to the axis L and passing through the rib 49.

  The stator 22 is disposed in the stator housing chamber 50 which is an annular recess provided on the outer peripheral side of the cylindrical portion 31 of the central projecting portion 33 on the upper surface side of the upper case 12. As shown in FIG. 4B, the stator core 25 includes an annular portion 51 and a plurality of salient poles 52 that project radially outward from the annular portion 51, and the drive coil 24 is wound around each of the plurality of salient poles 52. It has been turned. As shown in FIG. 2, each salient pole 52 is a drive magnet for the rotor 16 in the compartment 15 via a cylindrical portion 75 (see FIG. 6) provided on the outer peripheral side of the cylindrical portion 31 of the central protruding portion 33. Confronting 19 That is, the upper case 12 is disposed between the rotor 16 and the stator 22 and functions as a partition wall that separates the pump chamber 20 and the stator 22.

  The stator core 25 is configured by stacking a plurality of identically shaped plate-like cores formed by punching a thin magnetic steel plate in the vertical direction, and the lamination direction of the plate-like cores is the axis L direction. . On the inner peripheral surface of the annular portion 51 of the stator core 25, three inner concave portions 53 having a semicircular cross-sectional shape orthogonal to the axis L are formed at equal angular intervals around the axis L. The three inner recesses 53 have the same shape, and all extend in the axis L direction. Each inner recess 53 has a constant depth in the radial direction, and the cross-sectional shape is the same at any position in the direction of the axis L.

  Here, on the outer peripheral surface of the cylindrical portion 31 of the central projecting portion 33 of the upper case 12, three stator fixing ribs 54 (the same number as the inner concave portions 53 of the stator core 25) projecting radially outward from a portion in the circumferential direction. Is provided (see FIGS. 3 and 6). The stator fixing ribs 54 have a semicircular cross section perpendicular to the axis L, and are formed at equal angular intervals around the axis L of the shaft 17. Further, the three stator fixing ribs 54 have the same shape and extend in the axis L direction along the outer peripheral surface of the central projecting portion 33, and from the bottom 32 side to the opening end side (lower case 11). A taper surface in which the amount of protrusion in the radially outer side and the circumferential direction increases toward the side). Further, on the outer peripheral surface of the cylindrical portion 31 of the central projecting portion 33, the stator core 25 is brought into contact with the annular portion 51 of the stator core 25 from below in the axis L direction at a position different from the stator fixing rib 54 in the circumferential direction. A positioning portion 55 for positioning in the direction is provided (see FIGS. 2 and 6).

  The stator core 25 is dropped into the stator storage chamber 50 in a state in which the stator fixing rib 54 of the central projecting portion 33 is inserted into the inner recess 53 of the annular portion 51, and then the lower end portion of each stator fixing rib 54. Is supported by the upper case 12 by being press-fitted into the inner concave portion 53 of the annular portion 51. The stator core 25 is positioned in the direction of the axis L by contacting the positioning portion 55 after the stator fixing rib 54 is press-fitted into the inner recess 53 of the annular portion 51. Thereby, the stator 22 is fixed to the lower end side portion located on the opposite side of the bottom portion 32 in the axis L direction in the central projecting portion 33.

  As shown in FIG. 2, the substrate 23 is disposed on the upper surface of the upper case 12 in a space inside a frame portion 56 provided so as to surround the opening of the stator storage chamber 50. In other words, the substrate 23 has an opening 57 at the center, and a plurality of portions provided on the upper surface of the upper case 12 with the end portion on the bottom 32 side of the center protruding portion 33 protruding upward from the opening 57. Is mounted on the substrate mounting protrusion 58. In a state where the substrate 23 is placed on the substrate placement protrusion 58, the substrate 23 is positioned below the upper end surface of the frame portion 56, and the upper end surface of the frame portion 56 is the upper end of the cascade pump device 1. It has become. A lead wire 5 is connected to the surface of the substrate 23 on the side of the stator core 25, and the lead wire 5 is drawn out to the outside of the pump case 2 through the wiring extraction portion 6.

  Here, as shown in FIG. 1, a potting agent 59 is poured into the space inside the stator storage chamber 50 and the frame portion 56 of the upper case 12 from above until the substrate 23 is covered. Is sealed with a potting agent 59. In a state where the potting agent 59 covers the substrate, the upper surface of the potting agent 59 is positioned below the upper end surface of the frame portion 56. Further, the upper surface of the potting agent 59 is positioned below the upper surface of the sealing member 8 described later. As the potting agent 59, an insulating resin such as epoxy, acrylic, or silicon can be used. In this example, the potting agent 59 is polyurethane, and after being poured into the inside of the frame portion 56 and the stator storage chamber 50, it is thermally cured.

  When an excitation current is supplied from the connector 7 to the drive coil 24 via the lead wire 5 and the substrate 23, the rotor 16 rotates about the axis L. As a result, the liquid is sucked into the pump chamber 20 from the suction pipe 3, pressurized in the pump chamber 20, and discharged from the discharge pipe 4. The motor (rotor 16, stator 22, substrate 23) for driving the cascade pump device 1 of this example is a three-phase brushless motor, and the substrate 23 detects three positions (not shown) for detecting the position of the drive magnet 19 of the rotor 16. A drive IC that controls the excitation current to the Hall element and the drive coil 24 is disposed on the surface of the stator 22 side. The hall element is disposed above the stator 22 via an outer annular portion 78 of the upper case 12 described later. In addition, on the surface (upper surface) opposite to the stator 22 of the substrate 23, a coil joint portion 23a in which the end of the coil wire of the drive coil 24 is joined by soldering is configured. The coil wire of the drive coil 24 is pulled out to the opposite side of the stator 23 of the substrate 23 through the opening 57 of the substrate 23, for example. Here, when the order of the excitation currents supplied to the drive coil 24 is reversed, the rotor 16 rotates in the reverse direction, sucks liquid from the discharge pipe 4, pressurizes it in the pump chamber 20, and sucks the suction pipe 3. Discharge from.

(Lower case)
5A is a perspective view of the lower case 11 as viewed from above, and FIG. 5B is a perspective view of the lower case 11 as viewed from below. The lower case 11 includes a bottom plate portion 61, an annular side wall portion 62 that rises from the outer peripheral side portion of the bottom plate portion 61 and extends upward, and a circular recess 63 formed by the bottom plate portion 61 and the side wall portion 62. . The contour shape of the side wall 62 viewed from the direction of the axis L is substantially rectangular, and the planar shape of the lower case 11 viewed from the direction of the axis L is substantially rectangular. The side wall 62 has a flat upper end surface 62 a, and the upper end surface 62 a is the upper end surface of the lower case 11. The pump chamber 20 is configured in an annular shape along the periphery of the circular recess 63. A shaft fitting hole 35 is provided in the center of the circular bottom surface of the circular recess 63.

  An annular recess 64 is formed coaxially with the shaft fitting hole 35 on the outer peripheral side of the shaft fitting hole 35. An inner annular projecting surface 65 is formed between the shaft fitting hole 35 and the annular recess 64, and an outer annular projecting surface 66 is formed on the outer peripheral side of the annular recess 64. The shaft fitting hole 35 is provided with a fitting hole side guide surface 37.

  The outer annular projecting surface 66 is provided with a lower fluid flow path 26a and a lower blocking portion 27a that constitute the bottom surface of the pump chamber 20 along the peripheral edge thereof. An annular end surface portion 67 adjacent to the inside of the pump chamber 20 on the outer annular projecting surface 66 is opposed to the disk portion 40 of the rotor 16 disposed in the partition chamber 15 with a minute gap G1 (FIG. 2). reference). In the annular end surface portion 67, two grooves 67a having a constant width for communicating the annular concave portion 64 and the lower fluid flow path 26a are formed at positions separated by 180 °.

  An annular stepped portion 68 is provided on the inner peripheral surface of the upper portion of the circular recess 63, that is, the upper portion of the side wall portion 62. The annular step portion 68 includes an annular end surface 68a extending outward in the radial direction from a midway position in the axis L direction of the inner peripheral surface of the side wall portion 62, and a circular inner peripheral surface 68b extending upward from the outer peripheral edge of the annular end surface 68a. Yes. The annular step 68 is formed with a circular recess having a larger diameter than the circular recess 63 at the upper end portion of the upper case 12. A tapered step-side guide surface (second guide surface) 68c having a diameter that increases upward is provided at the upper opening edge of the circular inner peripheral surface 68b.

  From the front surface of the side wall portion 62, the suction pipe 3 and the discharge pipe 4 protrude in parallel. A front left corner portion 62b of the lower case 11 adjacent to the discharge pipe 4 of the side wall portion 62 is an inclined surface, and a hook 70 for locking the lead wire 5 is provided. An anti-rotation recess 69 that constitutes the anti-rotation mechanism 9 is provided on the right-side corner portion 62 c of the side wall 62. The anti-rotation recess 69 is a recess recessed downward in the axis L direction from the upper end surface 62a.

  A lower case fixing part 10 a constituting the case fixing part 10 projects forward from between the suction pipe 3 and the discharge pipe 4 on the front surface of the side wall part 62. The lower case fixing portion 10a is provided with a screw through hole 71 penetrating in the axis L direction. In addition, a screw through hole 71 that penetrates in the direction of the axis L is also provided in the rear right corner portion 62c and the rear left corner portion 62d of the side wall portion 62, respectively.

  Here, the lower case 11 is an injection-molded product, and the gate at the time of molding is provided at the lower center of the bottom plate portion 61. That is, in the bottom plate portion 61, a gate is provided on the opposite side to the shaft fitting hole 35. Therefore, since resin flows from the center of the shaft fitting hole 35, the shaft fitting hole 35 is formed with high dimensional accuracy.

(Upper case)
FIG. 6A is a perspective view of the upper case 12 viewed from above, and FIG. 6B is a perspective view of the upper case 12 viewed from below. As shown in FIG. 6A, the upper case 12 includes a central projecting portion 33, a cylindrical portion 75 configured coaxially with the central projecting portion 33, an open end of the central projecting portion 33, and a lower end of the cylindrical portion 75. An inner annular portion 76 that is continuous with the portion is provided. Further, as shown in FIG. 6B, the upper case 12 includes an annular projecting portion 77 configured to be coaxial with the central projecting portion 33 and the cylindrical portion 75 on the outer peripheral side of the cylindrical portion 75 and projecting downward. The outer annular portion 78 is continuous between the upper end portion of the cylindrical portion 75 and the upper end portion of the annular projecting portion 77, and the overhanging portion 79 projects from the upper end portion of the annular projecting portion 77 to the outer peripheral side. A frame portion 56 is provided on the upper surface of the overhang portion 79. The upper end surface of the frame portion 56 is flat and serves as a contact surface with a mating member to which the cascade pump device 1 is attached.

  The stator storage chamber 50 in which the stator 22 is disposed is configured by a surface on the opposite side of the lower case 11 from the central projecting portion 33, the cylindrical portion 75, and the inner annular portion 76. The central projecting portion 33 includes a projecting portion 33 a projecting upward from the opening of the stator storage chamber 50 on the bottom 32 side. The thickness of the cylindrical portion 75 in the radial direction is thinner than the thickness of the cylindrical portion 31 of the central projecting portion 33. The overhanging portion 79 has a flat lower end surface 79a.

  The annular projecting portion 77 includes a large-diameter portion 80 and a small-diameter portion 81 having an outer diameter smaller than that of the large-diameter portion 80 from the top to the bottom. On the annular lower end surface of the annular projecting portion 77 (the front end surface of the small diameter portion 81), an upper fluid flow path 26b and an upper sealing portion 27b constituting the ceiling surface of the pump chamber 20 are formed at a midway position in the radial direction. An annular end surface portion 77a adjacent to the inside of the pump chamber 20 at the annular lower end surface is opposed to the disk portion 40 of the rotor 16 disposed in the partition chamber 15 with a minute gap G2 (see FIG. 2). . Further, a tapered protruding portion side guide surface (second guide surface) 80b whose diameter decreases toward the lower end is provided at the lower end edge of the circular outer peripheral surface 80a of the large diameter portion 80 of the annular protruding portion 77. . Here, as shown in FIG. 2A, the annular projecting portion 77 (large diameter portion 80), together with the annular step portion 68 of the lower case 11, positions the upper case 12 and the lower case 11 in the radial direction. 82 is constituted. The height dimension in the axis L direction of the large-diameter portion 80 of the annular projecting portion 77 (the fitting allowance N2 of the large-diameter portion 80) is set longer than the fitting allowance N1 fitted into the shaft fitting hole 35 in the shaft 17. ing.

  The outline shape of the overhanging portion 79 is substantially rectangular, and the front left corner portion 79b is cut obliquely. The frame portion 56 protrudes upward from the outer peripheral edge of the overhang portion 79 except for the front left corner portion 79b having the notch. In the front left corner portion 79b, the frame portion 56 is provided at a position set back from the outer peripheral edge of the overhang portion 79. The front left corner portion 79b includes the wiring extraction portion 6. The details of the wiring extraction unit 6 will be described later.

  From the rear right corner portion 79c of the overhang portion 79, a cylindrical anti-rotation projection 83 that constitutes the anti-rotation mechanism 9 together with the anti-rotation recess 69 projects downward. The outer peripheral edge of the distal end surface 83a (lower end surface) of the rotation preventing projection 83 is rounded. Here, the position of the front end surface 83a of the rotation preventing projection 83 is the same position as the annular lower end surface of the annular projecting portion 77 in the axis L direction. Further, the protrusion dimension of the anti-rotation protrusion 83 is set shorter than the depth dimension of the anti-rotation recess 69. Further, the rotation-preventing protrusion 83 has a gap between the rotation-preventing protrusion 83 and the inner peripheral surface of the rotation-preventing recess 69 in the circumferential direction around the axis L when the rotation-preventing protrusion 83 is inserted into the rotation-preventing recess 69. In the radial direction centered on the axis L, a gap is formed between the inner peripheral surface of the anti-rotation recess 69.

  An upper case fixing portion 10b constituting the case fixing portion 10 projects forward from the center of the front surface of the overhang portion 79 in the apparatus width direction. The upper case fixing portion 10b is provided with a screw hole 84 that is recessed in the direction of the axis L. The rear right corner portion 79c and the rear left corner portion 79d are also provided with screw holes 84 that are recessed in the direction of the axis L, respectively.

  Here, the upper case 12 is an injection-molded product, and the gate at the time of molding is provided at the center of the central projecting portion 33. That is, a gate is provided on the opposite side of the shaft press-fit fixing hole 30 at the bottom 32 of the central protrusion 33. Accordingly, since the resin flows from the center of the shaft press-fit fixing hole 30, the shaft press-fit fixed hole 30 is formed with high dimensional accuracy.

(Pump chamber compartment formation)
When the pump chamber 20 (compartment chamber 15) is partitioned, the upper case 12 is turned upside down, and the shaft 17 is press-fitted and fixed in the shaft press-fitting fixing hole 30 of the upper case 12. The rotor 16 is disposed in the circular recess 63 of the lower case 11 and the shaft 17 is inserted into the bearing portion 41. Further, the O-ring 21 is attached to the outer periphery of the small diameter portion 81 of the annular projecting portion 77 of the upper case 12. At this time, a lubricant is applied to the O-ring 21.

  Next, the annular protrusion 77 of the upper case 12 is inserted inside the annular step portion 68 of the lower case 11. Here, since the tip end surface 83a of the anti-rotation projection 83 of the anti-rotation mechanism 9 is at the same position as the annular lower end surface of the annular protrusion 77 in the direction of the axis L, the annular protrusion 77 is inserted inside the annular step 68. At the same time, the anti-rotation protrusion 83 is inserted into the anti-rotation recess 69 provided in the lower case 11.

  Thereafter, the upper case 12 and the lower case 11 are brought closer to each other, and the large diameter portion 80 of the annular protrusion 77 of the upper case 12 is fitted into the annular step portion 68. As a result, the circular outer peripheral surface 80a of the large-diameter portion 80 of the annular protrusion 77 of the upper case 12 comes into contact with the circular inner peripheral surface 68b of the annular step portion 68 of the lower case 11, and the upper case 12 is in the lower case. 11 in the radial direction. Here, a projecting portion side guide surface 80 b is provided at the lower end edge of the large-diameter portion 80 of the annular projecting portion 77, and a step portion side guide surface is provided at the upper end opening edge of the circular inner peripheral surface 68 b of the annular step portion 68. Since 68 c is provided, it is easy to insert the annular protrusion 77 inside the annular step 68.

  When the upper case 12 and the lower case 11 are positioned, the end portion of the shaft 17 is fitted into the shaft fitting hole 35 with a slight delay from the time of positioning. Here, since the shaft 17 is provided with the shaft side guide surface 36 and the shaft fitting hole 35 is provided with the fitting hole side guide surface 37, the shaft 17 is fitted into the shaft fitting hole 35. Is easily done.

  Thereafter, the upper case 12 is further brought closer to the lower case 11 so that the end surface portion 77a of the annular protrusion 77 of the upper case 12 and the annular end surface 68a of the annular step portion 68 of the lower case 11 are brought into contact with each other. The upper case 12 is positioned in the radial direction with respect to the lower case 11 by bringing the upper end surface 62a of the side wall portion 62 into contact with the lower end surface 79a of the protruding portion 79 of the upper case 12. The O-ring 21 is crushed in the radial direction between the circular inner peripheral surface 68b of the lower case 11 of the small-diameter portion 81 of the annular protrusion 77 of the upper case 12, and fluid leakage from the compartment 15 is prevented. The formed state is formed. Thereby, as shown in FIG. 2, the lower case 11 and the upper case 12 are in a laminated state, and the pump chamber 20 (compartment chamber 15) is partitioned between them. When the lower case 11 and the upper case 12 are in a laminated state, the fitting of the shaft 17 into the shaft fitting hole 35 is completed. As a result, the axis of the shaft 17 is coaxial with the central protrusion 33 and the pump chamber. It coincides with the 20 central axis.

  Thereafter, the upper case 12 and the lower case 11 are fixed by three headed screws that pass through the screw through holes 71 provided in the lower case 11 and are screwed into the screw holes 84 provided in the upper case 12. The

(Wiring extraction part)
Next, with reference to FIG. 1, FIG. 3, FIG. 6, FIG. 7, FIG. FIG. 7A is a perspective view of the sealing member 8 viewed from above, and FIG. 7B is a perspective view of the sealing member 8 viewed from below. FIG. 8 is a partially enlarged view of the wiring extraction portion 6, FIG. 8A shows a state before the lead wire 5 is pulled out from the wiring extraction portion 6, and FIG. 8B is a drawing of the lead wire 5 from the wiring extraction portion 6. FIG. 8C shows a state in which the sealing member 8 is attached to the upper case 12 and the wiring outlet is sealed. FIG. 9 is an explanatory diagram of the wiring extraction unit 6. 9A is a plan view of the wiring extraction portion 6 viewed from the axial direction, FIG. 9B is a cross-sectional view taken along the line XX of FIG. 9A, and FIG. It is sectional drawing in the YY line of 9 (a). FIG. 9B and FIG. 9C show a state in which the potting agent 59 is filled inside the frame portion 56 and the stator storage chamber 50.

  As shown in FIG. 1, the wiring extraction portion 6 is configured at a front left corner portion 2 b of the pump case 2 (a front left corner portion 79 b of the upper case 12). As shown in FIGS. 3 and 6, the frame portion 56 provided in the upper case 12 so as to surround the opening of the stator storage chamber 50 is a rectangular portion from the upper end side with a constant width at the front left corner portion 79 b. The notch serves as a wiring outlet 85 for pulling out the lead wire 5 from the inside of the pump case 2 to the outside. A wiring placement portion 86 for placing the lead wire 5 is formed between the wiring outlet 85 and the outer peripheral edge of the overhang portion 79. A pair of fixing protrusions 87 for fixing the sealing member 8 to the case are provided on both sides of the wiring placement portion 86. A circular arc groove 88 extending toward the inner peripheral side is formed on the inner peripheral side of the wiring outlet 85 in the upper case 12. The blocking member 8 is attached to the upper case 12 from the mounting direction (axis L direction) along the height direction of the frame portion 56 in a direction intersecting with the lead-out direction of the lead wire 5.

  In the frame portion 56, the peripheral edge 91 of the front end surface 90 in the direction of the axis L (the mounting direction of the sealing member 8) of the pair of frame end portions 89 facing each other with the wiring outlet 85 interposed therebetween is as shown in FIG. A first edge 93 that is chamfered and a second edge 94 that is not chamfered are provided. More specifically, as shown in FIG. 8A, the peripheral edge 91 of the front end surface 90 of each frame end portion 89 is an outer peripheral peripheral portion 91 a outside the frame portion 56 and an inner peripheral peripheral portion 91 b inside the frame portion 56. , And an intermediate peripheral edge portion 91c on the wiring outlet 85 side, and the outer peripheral edge portion 91a, the intermediate peripheral edge portion 91c, and the inner peripheral edge portion 91b are connected to the intermediate peripheral edge portion 91c. This portion is a first edge 93. In the inner peripheral edge portion 91b, the portion opposite to the wiring outlet 85 side, that is, the portion facing the end portion in the width direction of the sealing member 8 when the sealing member 8 is attached to the case is the second edge. Part 94.

  On the upper surface of the wiring mounting portion 86, wiring holding grooves 95 having an arc-shaped cross section extending linearly along the diagonal line of the upper case 12 are provided in parallel by the number corresponding to the number of lead wires 5. The wiring holding groove 95 is provided with a first rib 95a and a second rib 95b extending in a direction orthogonal to the extending direction of the wiring holding groove 95 along the arc-shaped inner peripheral surface. The first rib 95a is formed on a line connecting the centers of the pair of fixing protrusions 87, and the second rib 95b is formed on a line connecting the pair of frame end portions 89. The wiring holding groove 95 and the arc groove 88 are formed on a straight line.

  The sealing member 8 is a resin member made of PPS or the like. As shown in FIGS. 3, 7, 8 (b) and 8 (c), the blocking member 8 has a planar shape wider than the opening width of the wiring outlet 85, and one edge in the width direction. A pair of cutout grooves 100 are provided on the other edge. The pair of notch grooves 100 are arranged in the same straight line, and open toward opposite sides. The pair of notch grooves 100 has a shape that fits with the pair of frame end portions 89.

  Further, as shown in FIG. 7, the sealing member 8 includes a thick portion 101 between the pair of cutout grooves 100 and on one side in the groove width direction of each cutout groove 100, and the grooves of the cutout grooves 100. A pair of thin portions 102 whose height in the axis L direction (mounting direction) is lower than that of the thick portion 101 are provided on the other side in the width direction. In the thick portion 101, a wiring holding groove 103 having an arcuate cross section corresponding to the wiring holding groove 95 of the wiring mounting portion 86 is formed on the lower surface of the central portion 101 a between the pair of cutout grooves 100. The wiring holding groove 103 extends in a direction perpendicular to the width direction of the sealing member 8, and the wiring holding groove 103 has ribs at positions facing the first rib 95 a and the second rib 95 b of the wiring holding groove 95. 103a is provided. Further, one end of the sealing member 8 in the groove width direction (the end of the thick portion 101) is cut out by a certain thickness from below, and the plate portion remaining on the upper side is located inside the frame portion 56. It becomes the board | substrate holding part 101b for pressing down the board | substrate 23 arrange | positioned from the top. The thin-walled portion 102 is provided with a projection through hole (fixing mechanism) 104 for allowing each of the pair of fixing projections 87 to pass therethrough.

  When the lead wire 5 is taken out from the inside of the pump case 2 through the wiring outlet 85, as shown in FIG. 8B, the surface on the stator 22 side of the substrate 23 arranged inside the frame portion 56. The lead wires 5 drawn out from are arranged on the wiring mounting portion 86. Thereafter, the sealing member 8 is moved closer to the upper case from the direction of the axis L, and the pair of frame end portions 89 are fitted into the pair of notch grooves 100 of the sealing member 8, and the fixing protrusion 87 is inserted into the protrusion through hole 104. To penetrate. Further, the outer peripheral frame end portion 23b of the substrate 23 is pressed from above by the substrate pressing portion 101b of the sealing member 8. Thereby, the lead wire 5 is sandwiched between the wiring holding groove 95 of the wiring mounting portion 86 and the wiring pressing groove 103 of the sealing member 8, and further, the first rib 95 a and the second rib 95 b of the wiring mounting portion 86. In addition, the sealing member 8 is fixed in a state where the coating is pressed by the rib 103a. Further, the pair of cutout grooves 100 of the sealing member 8 are fitted into the pair of frame end portions 89, and the sealing member 8 seals the space between the pair of frame end portions 89 (wiring outlet 85) without any gap. Thereafter, when the fixing protrusion 87 is thermally welded and the sealing member 8 is fixed to the upper case, a state is formed in which the lead wire 5 is pulled out from an intermediate position in the axis L direction of the pump case 2.

  Here, when the sealing member 8 is fixed to the upper case 12, as shown in FIGS. 8C and 9A, the first edge portion 93 of the front end surface 90 of the pair of frame end portions 89 and the sealing member 8 are used. A groove 106 is formed between them. That is, as shown in FIG. 9B, the first edge portion 93 extends downward from the upper end surface of the thick portion 101 of the sealing member 8 to form a groove 106. More specifically, the height in the axis L direction (mounting direction) of the thick portion 101 of the sealing member 8 does not protrude upward from the frame portion 56 in order to suppress the dimension in the axis L direction of the cascade pump device 1. In addition to the height of each of the frame end portions 89 (in this example, the height of the frame portion 56), the height between the pair of frame end portions 89 (the wiring outlet 85) is sealed. Therefore, the end face of the thick wall portion 101 of the inner wall surface portion of the cutout groove 100 of the sealing member 8 and the first edge portion 93 which is an inclined surface face each other to form the groove 106. To do.

  On the other hand, the second edge portion 94 of the front end surface 90 of the pair of frame end portions 89 is in close contact with the sealing member 8 when the sealing member 8 is fixed to the upper case 12 as shown in FIG. Therefore, the groove 106 formed around each frame end portion 89 is closed on the outer peripheral side of the second edge portion 94. More specifically, the groove 106 formed between each frame end portion 89 and the sealing member 8 does not communicate the inside and outside of the frame portion 56, and becomes a groove opening at the inside end of the frame portion 56. The portion is blocked by the second edge 94.

  Note that the thin portion 102 of the sealing member 8 is lower in height in the axis L direction than the first edge portion 93 of each frame end portion 89 when the sealing member 8 is fixed to the upper case 12. Therefore, the end surface of the thin portion 102 in the inner wall surface portion of the cutout groove 100 of the sealing member 8 is in close contact with the end surface on the outer peripheral side of the frame end portion 89 positioned below the first edge portion 93.

(Filling potting agent)
When the wiring outlet 85 is blocked by the blocking member 8, a set amount of potting agent 59 is poured into the inside of the frame portion 56 and the stator storage chamber 50 from above and filled. The filling height of the potting agent 59 is above the substrate 23 as shown in FIG. Thereby, in this example, the joint part of the coil joint part 23 a of the substrate 23 and the end part of the coil wire of the drive coil 24 is embedded in the potting agent 59. The filling height of the potting agent 59 is higher than the wiring placement portion 86 on which the lead wire 5 is placed. Further, the filling height of the potting agent 59 is lower than the upper end of the frame portion 56 and the upper end of the sealing member 8. The potting agent 59 is cured by heat and seals the substrate 23 and the stator 22.

  Here, the set amount is controlled so that the filling height of the potting agent 59 filled inside the frame portion 56 does not reach the upper end of the sealing member 8 (the upper end surface of the thick portion 101). However, when the potting agent 59 is filled in the frame portion 56 and the stator storage chamber 50, as shown in FIG. 9C, the potting agent 59 is removed by the surface tension at the position away from the wiring extraction portion 6. The upper end of the frame portion 56 may reach the edge portion of the upper end surface. In this case, if the peripheral edge 91 of the upper end surface of the frame end portion 89 is the first edge portion 93 that is chamfered over the entire circumference, a groove formed between the first edge portion 93 and the sealing member 8. Since 106 communicates the inside and outside of the frame portion 56, the potting agent 59 reaching the edge portion of the upper end surface of the sealing member 8 may be transmitted through the groove 106 by capillary action and leak to the outside. However, in this example, the second edge portion 94 is provided on the peripheral edge 91 of the front end surface 90 of the frame portion 56, and the second edge portion 94 is a portion facing the end portion in the width direction of the sealing member 8. And the groove 106 is prevented from opening inside the frame portion 56. As a result, the potting agent 59 does not enter the groove 106, and the potting agent 59 does not leak through the groove 106.

(Function and effect)
According to this example, the sealing member 8 that seals the wiring outlet 85 formed by cutting out the frame portion 56 is a member wider than the opening width of the wiring outlet 85, and the wiring outlets are provided at both end edges in the width direction. Since the pair of notch grooves 100 fitted to the pair of frame end portions 89 facing each other with the 85 therebetween are provided, the sealing member 8 is simply fitted into the frame end portion 89 from the axis L direction (mounting direction). The wiring outlet 85 can be sealed by sandwiching the lead wire 5 between the sealing member 8 and the wiring mounting portion 86 by a simple operation. Further, since the first edge portion 93 is chamfered on the peripheral edge 91 of the front end surface 90 in the mounting direction of each frame end portion 89, the sealing member 8 is fitted into the frame end portion 89 from the mounting direction. The sealing member 8 can be fitted into each frame end portion 89 by using the first edge 93 of the front end surface 90 as a guide surface. Therefore, it becomes easy to block the wiring outlet 85 by the blocking member 8.

  Further, in this example, the peripheral edge 91 of the front end surface 90 of the frame end portion 89 is not chamfered over the entire circumference, and the second edge portion 94 that is not chamfered remains. As a result, the groove 106 formed around the frame end portion 89 does not communicate the inside and the outside of the frame portion 56, so that the potting agent 59 poured into the inside of the frame portion 56 leaks to the outside through the groove 106. I do not put out.

  Furthermore, in this example, the substrate 23 and the stator 22 are sealed with a potting agent 59. Accordingly, the substrate 23 and the stator 22 can be securely fixed to the pump case 2 (upper case 12). Further, since the substrate 23 and the stator 22 are fixed to the upper case 12 by the potting agent 59, the substrate 23 and the stator 22 are prevented from resonating with the pump operation of the cascade pump device 1 to generate noise. That is, in the cascade pump device 1 of this example, a noise reduction of 3 dB to 6 dB is recognized as compared with the case where the substrate 23 is not sealed with the potting agent 59.

  In this example, since the substrate 23 and the stator 22 are sealed with the potting agent 59, the coil joint portion 23a of the substrate 23, the electrical components mounted on the substrate 23 such as the Hall element and the driving IC, and the stator core 25 rust can be prevented.

  Further, in this example, the sealing member 8 is provided with a thin portion 102, and the fixing protrusion 87 of the upper case 12 is passed through the projection through hole 104 formed in the thin portion 102 and thermally sealed, thereby sealing the sealing member 8. Since the fixing structure for fixing to the upper case 12 is adopted, the fixing structure for fixing the sealing member 8 to the upper case 12 is more than the frame portion 56 as shown in FIGS. 9B and 9C. Protruding upward is avoided.

(Other embodiments)
The second edge portion 94 is provided at any position on the peripheral edge 91 of the front end surface 90 of the frame portion 56 as long as the groove 106 formed between the first edge portion 93 and the sealing member 8 can be divided. It may be done. Here, if the second edge portion 94 is provided on the inner peripheral edge portion 91 b, the potting agent 59 can be dammed inside the frame portion 56 even when the potting agent 59 is transmitted through the groove 106.

  Further, as the potting agent 59, a photo-curing resin or a two-component mixed curing resin may be used.

1 ... Cascade pump device 5 ... Lead wire (wiring)
8 ... Sealing member 12 ... Upper case (case)
18 ... Impeller 23 ... Substrate 24 ... Drive coil 50 ... Stator storage chamber (recess)
56 ... Frame 59 ... potting agent (sealing agent)
85 ... Wiring outlet 86 ... Wiring placing portion 89 ... Frame end portion 90 ... Front end surface 91 of frame end portion ... Perimeter 91a of front end surface ... Outer peripheral portion 91b -Inner peripheral edge portion 91c ... Intermediate peripheral edge portion 93 ... First edge portion 94 ... Second edge portion 100 ... Notch groove 101 ... Thick portion 102 ... Thin portion 104 ... -Protrusion through hole (fixing mechanism)
106 ... groove

Claims (6)

A recess that houses a drive coil for driving the impeller, a frame that surrounds the opening of the recess, a wiring outlet that is provided by cutting out the frame, and an inner side of the frame via the wiring outlet A case having a wiring placement portion for placing wiring drawn out from the outside,
A sealing member that is attached to the case from the mounting direction along the height direction of the frame portion and seals the wiring outlet in a state where the wiring is sandwiched between the wiring placement portion,
A sealant poured into the recess and the inside of the frame portion and cured,
The sealing member is wider than the opening width of the wiring outlet, and is provided with a pair of notch grooves fitted to a pair of frame end portions facing each other across the wiring outlet at both ends in the width direction. And
In each frame end portion, the peripheral edge of the front end surface in the mounting direction includes a first edge portion that is chamfered and a second edge portion that is not chamfered,
A cascade pump device, wherein a groove is formed between the first edge and the sealing member, and the second edge and the sealing member are in close contact with each other. In claim 1,
The peripheral edge of the front end surface of each frame end part is composed of an outer peripheral edge part on the outer side of the frame part, an inner peripheral part on the inner side of the frame part, and an intermediate peripheral part on the wiring outlet side,
The outer peripheral edge portion and the intermediate peripheral edge portion are the first edge portions,
The said 2nd edge is provided in the said inner periphery part, The cascade pump apparatus characterized by the above-mentioned. In claim 2,
The said 2nd edge is provided in the site | part facing the edge part of the width direction of the said sealing member in the said inner periphery part, The cascade pump apparatus characterized by the above-mentioned. In claim 2 or 3,
The blocking member includes a thick portion on one side in the groove width direction of the notch groove, and includes a thin portion on the other side having a height in the mounting direction lower than the thick portion,
The thick part is disposed inside the frame end part,
The thin portion is disposed outside the frame end portion,
The height of the thick portion is a height that can be opposed to the first edge when the sealing member is attached to the case,
The height of the thin portion is lower than the first edge when the sealing member is attached to the case,
The cascade pump device according to claim 1, wherein the thin portion is provided with a fixing mechanism for fixing the sealing member to the case. In any one of claims 1 to 4,
A substrate that is disposed inside the frame portion and that is at least partially embedded in the sealant together with the drive coil;
One end of the wiring is connected to the driving coil via the substrate, and the cascade pump device. In claim 5,
The substrate includes a coil joint portion in which an end portion of the coil wire of the drive coil is electrically joined to a surface opposite to a side where the drive coil is located,
The cascade pump device, wherein the coil joint is embedded in the sealant.

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