JP6150115B2 - Motors and pumps - Google Patents

Description

  The present invention relates to motors and pumps.

  Conventionally, in a pump for a water heater, a motor that separates a rotor magnet and a stator by a covered cylindrical casing has been used. The rotor magnet is connected to the impeller and disposed inside the casing. The annular stator surrounds the rotor magnet outside the casing. Moreover, resin is filled into the upper side of the lid part and the radially outer side of the cylindrical part in the casing, and the stator is sealed. That is, a motor frame that covers the stator is formed by resin molding. Thereby, the stator is protected from the liquid flowing in the pump.

In the motor disclosed in Japanese Patent Application Laid-Open No. 2008-75462, the partition plate from the mold resin is embedded in a non-water contact surface at the bottom (lid) of the cylindrical portion of the partition plate (casing). A retaining protrusion is provided to prevent floating. Japanese Patent Application Laid-Open No. 2008-109848 proposes using a thermosetting unsaturated polyester resin in a resin mold. The thermosetting unsaturated polyester is excellent in heat dissipation and vibration absorption, and can promote absorption of armature vibration and heat dissipation from the coil.
JP 2008-75462 A JP 2008-109848 A

  By the way, in the motor of the said structure, it is difficult to ensure the adhesiveness between the cover part of a casing and a motor frame for reasons, such as presence of the gas in an interface, or a difference in material. Therefore, a gap is formed between the lid and the motor frame. In this case, when the motor is driven, the lid vibrates due to switching of the energization direction to the stator coil. And when a cover part resonates to switching frequency, a big noise will generate | occur | produce. As disclosed in Japanese Patent Application Laid-Open No. 2008-75462, it is conceivable to provide a protrusion for retaining the cover on the lid of the casing, but the vibration of the lid may not be sufficiently suppressed. In addition, depending on the shape of the retaining protrusion, the resin may not be stably supplied to the entire top surface of the lid when the motor frame is formed. In order to ensure a constant quality of the motor, it is important that the resin is stably supplied to the entire top surface of the lid when the motor frame is formed.

  An object of the present invention is to greatly suppress vibration of a lid portion of a casing during driving of a motor and to stably supply resin to the entire upper surface of the lid portion when a motor frame is formed.

A motor according to an exemplary embodiment of the present invention includes a cylindrical rotor magnet centered on a central axis facing in the up-down direction and an impeller disposed on the lower side of the rotor magnet. A rotating part that rotates about the center, a stationary part, and a bearing mechanism that rotatably supports the rotating part with respect to the stationary part, wherein the stationary part has a covered cylindrical shape centered on the central axis There is a casing in which the rotor magnet is arranged inside, a stator that surrounds the rotor magnet outside the cylindrical portion of the casing, and an upper side of the lid portion in the casing and a radially outer side of the cylindrical portion a resinous, and a motor frame covering at least a portion of said stator, the protruding portion is provided on the upper surface of the casing, the protrusion, the central axis Also disposed on the radially outer side, has a plurality of protruding elements which are different from each other position in the radial direction, the whole of the non-projection region except for the protrusion in the upper surface, continuously in a direction perpendicular to the central axis One continuous region that extends.

  A motor according to another exemplary embodiment of the present invention includes a cylindrical rotor magnet centered on a central axis facing in the up-down direction and an impeller disposed below the rotor magnet, A rotating part that rotates about an axis; a stationary part; and a bearing mechanism that rotatably supports the rotating part with respect to the stationary part, wherein the stationary part is a covered cylinder centered on the central axis A casing in which the rotor magnet is disposed inside, a stator surrounding the rotor magnet on the outer side of the cylindrical part of the casing, an upper side of the lid part in the casing and a radially outer side of the cylindrical part A motor frame that covers at least a portion of the stator, and a protrusion is provided on the upper surface of the casing, and the protrusion has a diameter at both ends. At least one linear protruding elements different positions of the direction, the whole of the non-projection region except for the protrusion in the upper surface is a single continuous region extending continuously in a direction perpendicular to the central axis.

  According to the exemplary motor of the present invention, the vibration of the lid portion of the casing during driving of the motor is greatly suppressed, and the resin can be stably supplied to the entire upper surface of the lid portion when the motor frame is formed. it can.

FIG. 1 is a plan view showing a pump according to the first embodiment. FIG. 2 is a longitudinal sectional view of the pump. FIG. 3 is an enlarged view showing the stationary part. FIG. 4 is a plan view showing the casing. FIG. 5 is a plan view showing a casing of the pump according to the second embodiment. FIG. 6 is a plan view showing another example of the casing.

  In the present specification, the upper side in the central axis direction of the motor is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device. A direction parallel to or approximately parallel to the central axis is referred to as an “axial direction”, a radial direction centered on the central axis is simply referred to as “radial direction”, and a circumferential direction centered on the central axis is simply referred to as “circumferential direction”. Called “direction”.

(First embodiment)
FIG. 1 is a plan view showing a pump 1 according to an exemplary first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the pump 1 at a position indicated by an arrow AA in FIG. The pump 1 is used for a hot water heater, for example. The pump 1 includes a motor 12 and a pump casing 11. The pump casing 11 includes a lower casing part 111, an upper casing part 112, and a partition plate 113. The partition plate 113 is disposed between the lower casing portion 111 and the upper casing portion 112. In the lower casing portion 111 of FIG. 1, an inflow port 114 through which liquid from the outside flows in and an outflow port 115 through which liquid flows out are formed. The upper casing portion 112 in FIG. 2 forms a liquid flow path between the inflow port 114 and the outflow port 115 together with the partition plate 113. A pump chamber 116 is provided in the flow path. A casing 5 that is a part of the motor 12 is fixed to the upper casing portion 112. The casing 5 has a covered cylindrical shape centering on the central axis J <b> 1 that faces in the vertical direction, and covers the top of the pump chamber 116.

  The motor 12 includes a rotating unit 3, a stationary unit 2, and a bearing mechanism 4 that supports the rotating unit 3 to be rotatable with respect to the stationary unit 2. The rotating part 3 includes a cylindrical holding part 31 centered on the central axis J1, a rotor magnet 32, and an impeller 33. The rotor magnet 32 has a cylindrical shape centered on the central axis J1. A cylindrical holder 31 is inserted into the rotor magnet 32, and the rotor magnet 32 is fixed on the outer peripheral surface of the cylindrical holder 31. The impeller 33 is disposed below the rotor magnet 32. The cylindrical holding part 31 and the impeller 33 are formed of resin as one member. The rotor magnet 32 is disposed inside the casing 5, and the impeller 33 is disposed in the pump chamber 116. The impeller 33 includes a tubular portion 331 and a plurality of blades 332 provided on the outer peripheral surface of the tubular portion 331. The plurality of blades 332 rotate around the central axis J <b> 1, whereby a liquid flow is generated in the pump chamber 116. Thereby, the liquid flowing into the pump 1 from the inlet 114 flows to the outlet 115.

  The bearing mechanism 4 includes a shaft 41 and a sleeve 42 into which the shaft 41 is inserted. The sleeve 42 is inserted into the cylindrical holding part 31 and fixed to the rotating part 3. A cylindrical shaft fixing portion 53 extending along the central axis J1 is provided on the lower surface of the lid portion 51 of the casing 5. The upper portion of the shaft 41 is press-fitted into the shaft fixing portion 53 and fixed to the stationary portion 2. A washer 43 is disposed between the lower end of the shaft fixing portion 53 and the upper end of the sleeve 42. The lower casing portion 111 is provided with a cylindrical protruding portion 117 that protrudes into the pump chamber 116. The upper part of the cylindrical protrusion 117 is disposed in the cylindrical part 331 of the impeller 33. A lower portion of the shaft 41 is press-fitted into the cylindrical projecting portion 117 and is fixed to the lower casing portion 111. A washer 44 is disposed between the upper end of the cylindrical protrusion 117 and the lower end of the sleeve 42. The sleeve 42 is supported in the thrust direction by these washers 43 and 44.

  The stationary part 2 includes a casing 5, a stator 21, and a motor frame 22. The casing 5 includes a lid part 51, a cylinder part 52, and a flange part 50. The flange portion 50 is fixed to the upper casing portion 112. The annular stator 21 surrounds the rotor magnet 32 on the outside of the cylindrical portion 52 of the casing 5. The stator 21 is fixed to the outer peripheral surface of the cylindrical portion 52. Stator 21 includes a stator core 211, a plurality of coils 212, and an insulator 213. Stator core 211 is formed of laminated steel plates. The insulator 213 covers a portion of the stator core 211 around which the conducting wire of the coil 212 is wound, and insulates the coil 212 and the stator core 211 from each other. The shape of the stator 21 is not necessarily annular, and may be changed as appropriate.

  A circuit board 23 that extends along the upper surface 511 of the lid 51 is provided on the upper side of the casing 5. Lead lines from the coil 212 are connected to the circuit board 23 via pins not shown. Thereby, the stator 21 and the circuit board 23 are electrically connected. The insulator 213 includes a protrusion 214 that protrudes above the coil 212. The protrusion 214 is in contact with the circuit board 23. The motor frame 22 is a resin filled in the casing 5 on the upper side of the lid portion 51 and on the radially outer side of the cylindrical portion 52, and seals the stator 21 and the circuit board 23. When the motor 12 is driven, a rotational force is generated between the rotor magnet 32 and the stator 21. Thereby, the rotation part 3 rotates centering on the central axis J1. For example, the number of poles in the rotor magnet 32 is 8, and the number of slots in the stator 21 is 12. In this case, switching of the energization direction to the coil, that is, switching is performed 24 times while the rotating unit 3 makes one rotation.

  FIG. 3 is an enlarged vertical sectional view showing the stationary part 2, and FIG. 4 is a plan view showing the casing 5. A protrusion 6 is provided on the upper surface 511 of the lid 51 of the casing 5. The protrusion 6 includes a plurality of inner protrusion elements 61 and a plurality of outer protrusion elements 62. Each protruding element 61, 62 protrudes upward from the upper surface 511. The plurality of projecting elements 61 and 62 on the upper surface 511 are isolated from each other. When the protrusion 6, that is, the region 512 excluding all the protrusion elements 61 and 62 on the upper surface 511 is referred to as a “non-projection region 512”, the entire non-projection region 512 is continuous in a direction perpendicular to the central axis J 1. One continuous region that extends. The non-projection region 512 is flat.

  The inner protruding element 61 is disposed on the upper surface 511 of the lid portion 51 at a position closer to the central axis J <b> 1 than the outer edge of the upper surface 511. That is, the inner protrusion element 61 is disposed near the center of the upper surface 511. The outer protruding element 62 is disposed on the upper surface 511 at a position closer to the outer edge than the central axis J1. As described above, the protruding portion 6 includes a plurality of protruding elements 61 and 62 having different radial positions. The shape of each projecting element 61, 62 is a cylinder. Therefore, when viewed along the vertical direction, that is, the shape of each of the projecting elements 61 and 62 in a plan view is circular and dot-shaped. The shape of each of the projecting elements 61 and 62 in a plan view may be, for example, a polygon such as a quadrangle, or a shape in which minute projections are arranged on a circular outer periphery. Also in these cases, the shape of the projecting elements 61 and 62 can be regarded as a point shape.

  The plurality of outer protruding elements 62 are arranged at substantially equal intervals on one circumference centered on the central axis J1. That is, the distance between the centers is substantially constant in all combinations of the two outer protrusion elements 62 adjacent to each other in the plurality of outer protrusion elements 62. The distance between the centers of the two inner protrusion elements 61 adjacent to each other in the plurality of inner protrusion elements 61 is substantially equal to the distance between the centers of the outer protrusion elements 62.

  Among the plurality of inner protrusion elements 61 and the plurality of outer protrusion elements 62, each combination of one inner protrusion element 61 and one outer protrusion element 62 is referred to as a “protrusion element pair”. Further, an angle formed by a line segment connecting the center of the inner projecting element 61 of each projecting element pair and the central axis J1 and a line segment connecting the center of the outer projecting element 62 of the projecting element pair and the central axis J1 is “ This is called “projection element diagonal”. In the protrusion 6 of FIG. 4, the minimum protrusion element diagonal θ1 is 90 degrees in the plurality of protrusion element pairs. The maximum protrusion element diagonal θ2 in the plurality of protrusion element pairs is 180 degrees. Thus, the angle formed by the line segment connecting the center of the arbitrary inner protrusion element 61 and the central axis J1 and the line segment connecting the center of the arbitrary outer protrusion element 62 and the central axis J1 is 90 degrees or more, and 180 degrees or less. Therefore, on the upper surface 511 of the lid portion 51, it can be said that the plurality of inner protruding elements 61 and the plurality of outer protruding elements 62 are arranged in regions opposite to each other across the central axis J1. A region between the plurality of inner protrusion elements 61 and the plurality of outer protrusion elements 62 occupies most of the non-protrusion area 512.

  A predetermined electronic component 231 is provided on the lower surface of the circuit board 23 in FIG. The electronic component 231 is disposed between the plurality of inner protruding elements 61 and the plurality of outer protruding elements 62. In FIG. 4, the electronic component 231 is indicated by a two-dot chain line. When viewed along the vertical direction, the electronic component 231 overlaps the non-projection region 512. The electronic component 231 preferably overlaps only with the non-projection region 512. In the protruding elements 61 and 62, a step that avoids interference with the electronic component 231, that is, a part that is partially low in height may be formed. In this case, most of the electronic component 231 overlaps with the non-projection region 512 and part of it overlaps with part of the projection 6 in plan view.

  As shown in FIG. 3, the heights of the plurality of inner protrusion elements 61 and the plurality of outer protrusion elements 62 in the vertical direction are substantially constant. A minute gap 221 is provided between the upper ends of the projecting elements 61 and 62 and the circuit board 23. In the motor frame 22, resin is also present in the minute gap 221. The width of the minute gap 221 is sufficiently smaller than the width of the gap between the protruding elements in the plurality of protruding elements 61 and 62. In other words, the minimum value of the gap between the protruding elements in the plurality of protruding elements 61 and 62 is larger than that of the minute gap 221.

  The motor frame 22 includes a through hole 222 penetrating upward from the upper surface 511 of the lid portion 51 of the casing 5. The through hole 222 is located approximately at the center of the upper surface 511. That is, the through hole 222 is formed at a position overlapping the shaft 41 of FIG. 2 when viewed along the vertical direction. In the circuit board 23 of FIG. 3, an opening 232 is formed at a position overlapping the through hole 222. Therefore, the through hole 222 is not blocked by the circuit board 23. The cross-sectional area of the through hole 222 perpendicular to the central axis J1 gradually increases upward. The inner protrusion element 61 is adjacent to the through hole 222.

  The motor frame 22 is molded from, for example, a thermosetting resin such as a thermosetting unsaturated polyester resin. When the motor frame 22 is molded, the annular stator 21 is disposed around the cylindrical portion 52 of the casing 5. Further, the circuit board 23 is disposed above the lid portion 51 of the casing 5. The casing 5, the stator 21, and the circuit board 23 are disposed inside a predetermined mold, and resin is supplied into the mold. At this time, a mold gate is arranged at a position where the stator 21 exists in the direction of the central axis J1. The gate of the mold is on the line connecting the inner protrusion element 61 and the outer protrusion element 62 of the protrusion element pair having the maximum protrusion element diagonal θ2 in FIG. It is provided at a close position. In FIG. 4, the position at which the mold gate is disposed with respect to the casing 5 when the motor frame 22 is formed is indicated by an arrow denoted by reference numeral A <b> 1.

  Immediately after supplying the resin into the mold, the resin flows into the lower side of the circuit board 23 before the upper side of the circuit board 23 at a position close to the gate at the outer edge of the upper surface 511 of the lid 51. Therefore, the circuit board 23 is pushed upward at the position. The circuit board 23 is fixed to the plurality of protrusions 214 of the insulator 213 at a plurality of positions in the circumferential direction. Therefore, the circuit board 23 does not tilt excessively.

  Thereafter, the resin flows into the upper side of the circuit board 23 before the lower side of the circuit board 23 at a position farthest from the gate in the outer edge portion of the upper surface 511. Therefore, the circuit board 23 is pushed downward at the position. The outer protrusion element 62 of the protrusion element pair is disposed at the position. Therefore, the circuit board 23 is not greatly bent downward at the position. On the side surface of the motor frame 22 formed using the mold, there is a gate mark below the circuit board 23. When viewed along the vertical direction, the angle formed by the line segment connecting the outer projecting element 62 of the projecting element pair and the central axis J1 and the line segment connecting the gate trace and the central axis J1 is 180 degrees. is there. By providing the outer protruding element 62 at a position where the circuit board 23 is pushed down by the resin when the motor frame 22 is formed, it is possible to suppress the bending of the circuit board 23.

  The thermosetting unsaturated polyester resin has a property of easily generating gas in the process of curing the resin at the time of molding. For this reason, when insert molding is performed using the casing 5 as an insert component, the gas generated from the resin remains between the resin and the casing 5. In the stationary part 2 of FIG. 3, due to the presence of gas generated between the motor frame 22 and the casing 5, the difference in material between the motor frame 22 and the casing 5, etc., the lid part 51 of the casing 5 and the motor frame 22 It is difficult to ensure adhesion between the two. Therefore, a gap may be generated between the lid 51 and the motor frame 22. In this case, the lid 51 vibrates due to switching of the coil 212 of the stator 21 when the motor 12 is driven. On the other hand, the protrusion 6 is provided on the upper surface 511 of the casing 5, and the protrusion 6 includes a plurality of protrusion elements 61 and 62 having different radial positions. As a result, the resin wraps around the protruding elements 61 and 62 when the motor frame 22 is molded, so that the adhesion between the motor frame 22 and the casing 5 is enhanced. The vibration of the lid portion 51 of the casing 5 can be greatly suppressed. As a result, noise during driving of the pump 1 can be reduced.

  Here, it is assumed that an annular projecting element is provided on the upper surface 511 of the lid 51. In this case, a part of the non-projection region is isolated in the annular projection element. Therefore, when the motor frame 22 is formed, there is a possibility that the supply of resin to the region in the annular projecting element is hindered by the projecting element.

  On the other hand, in the stationary part 2 of FIG. 3, the entire non-projection region 512 on the upper surface 511 of the casing 5 is one continuous region that continuously extends in a direction perpendicular to the central axis J1. Thereby, the resin can be stably supplied to the entire upper surface 511 of the lid portion 51 when the motor frame 22 is formed. Further, since the protruding elements 61 and 62 are point-like when viewed along the vertical direction, the resin can be supplied to the entire upper surface 511 of the lid 51 more stably.

  Further, a design in which a minute gap 221 is provided between the upper end of the protrusion 6 and the circuit board 23 is employed. With such a design, the downward bending of the circuit board 23 can be restricted by the protrusion 6 when the motor frame 22 is formed. When viewed along the vertical direction, the electronic component 231 overlaps the non-projection region 512, so that interference between the electronic component 231 and the projection 6 can be avoided. On the side surface of the motor frame 22, a gate mark is formed below the circuit board 23. Thus, when the motor frame 22 is formed, the resin substrate is filled from the side of the mold, whereby the deformation of the circuit board 23 can be suppressed.

  In the stationary part 2, the motor frame 22 includes a through hole 222. Thereby, it can suppress that the gas emitted from resin accumulates between the motor frame 22 and the cover part 51. FIG. As a result, the lid 51 is prevented from being greatly bent. The through hole 222 is located at the center of the upper surface 511 of the lid part 51, and a part of the protrusion 6 is located on the radially outer side of the through hole 222. Therefore, the vibration of the lid 51 can be limited near the center of the lid 51 where the amplitude is likely to be maximized, and the vibration of the lid 51 can be further suppressed.

(Second Embodiment)
FIG. 5 is a plan view showing a casing 5a of the pump 1 according to the second exemplary embodiment of the present invention. The casing 5a of FIG. 5 differs in the structure of the projection part 6a compared with the casing 5 of FIG. The other structure is the same as that of the casing 5 of FIG. 4, and the same code | symbol is attached | subjected to the same structure.

  The protrusion 6 a includes a plurality of linear protrusion elements 63 extending along a direction parallel to the upper surface 511 on the upper surface 511 of the lid 51. The angle formed by the line connecting the center of each linear protrusion element 63 and the central axis J1 and the linear protrusion element 63 is approximately 0 degrees. That is, the plurality of linear protrusion elements 63 extend radially around the central axis J1. One end of each linear protrusion element 63 is disposed at a position closer to the central axis J1 than the outer edge of the upper surface 511. That is, one end of the linear protrusion element 63 is disposed near the center of the upper surface 511. The other end of the linear protrusion element 63 is disposed on the upper surface 511 at a position closer to the outer edge than the central axis J1. Thus, in each linear projection element 63 of the projection part 6a, the radial position of both ends is different.

  In the stationary part 2 including the casing 5a, the motor frame 22 is provided in the same manner as the stationary part 2 in FIG. The motor frame 22 is a resin that covers the stator 21 and the circuit board 23. On the side surface of the motor frame 22, there is a gate mark below the circuit board 23. In FIG. 5, the position at which the mold gate is disposed with respect to the casing 5 when the motor frame 22 is formed is indicated by an arrow denoted by reference numeral A <b> 1. When viewed along the vertical direction, an angle formed by a line segment connecting the linear protrusion element 63 farthest from the gate trace and the central axis J1 and a line segment connecting the gate trace and the central axis J1 is 180 degrees. It is. Therefore, when the motor frame 22 is formed, the circuit board 23 is prevented from being bent downward at a position farthest from the gate at the outer edge portion of the upper surface 511.

  As described above, in the stationary part 2, the protrusion 6a provided on the upper surface 511 of the casing 5a includes a plurality of linear protrusion elements 63 having different radial positions at both ends. Thereby, the vibration of the lid 51 of the casing 5a when the motor 12 is driven can be significantly suppressed, and the noise in the pump 1 can be reduced. Further, the entire non-projection region 512 on the upper surface 511 of the casing 5a is one continuous region that continuously extends in a direction perpendicular to the central axis J1. Accordingly, the resin can be stably supplied to the entire upper surface 511 of the lid portion 51 when the motor frame 22 is formed.

  When the shape of each projecting element 63 is linear when viewed along the vertical direction, the resin can be supplied more stably to the entire upper surface 511 of the lid 51. Also in the casing 5a, the minimum value of the gap between the plurality of linear protrusion elements 63 is larger than the minute gap 221 between the upper end of the protrusion 6a and the circuit board 23. Thereby, resin can be further stably supplied to the whole upper surface 511 of the cover part 51.

  Further, the protrusion 6 a close to the lower surface of the circuit board 23 can limit the bending of the circuit board 23 when the motor frame 22 is formed. On the side surface of the motor frame 22, a gate mark is formed below the circuit board 23. Thus, when the motor frame 22 is formed, the resin substrate is filled from the side of the mold, whereby the deformation of the circuit board 23 can be suppressed.

  By including the through hole 222 in the motor frame 22, it is possible to suppress accumulation of gas generated from the resin between the motor frame 22 and the lid portion 51. As a result, the lid 51 is prevented from being greatly bent. The through hole 222 is located at the center of the upper surface 511 of the lid part 51, and a part of the protrusion 6 a is located on the radially outer side of the through hole 222. Therefore, the vibration of the lid 51 can be limited near the center of the lid 51 where the amplitude is likely to be maximized, and the vibration of the lid 51 can be further suppressed.

  The pump 1 can be variously modified. The positions, shapes, and numbers of the projecting elements 61 to 63 in the projecting portions 6 and 6a may be changed as appropriate. For example, in the casing 5b of FIG. 6, the two linear protrusion elements 63 are disposed in the regions on the upper surface 511 on the right side and the left side of the central axis J1. The distance between the two linear protrusion elements 63 increases as the distance from the mold gate at the time of forming the motor frame 22, that is, the position indicated by the arrow A1. In the casing, dot-like projecting elements and linear projecting elements may be mixed. In addition, protruding elements having other shapes may be provided.

  From the viewpoint of easily producing the casings 5 and 5a, it is preferable that the cross-sectional area of the protrusions 6 and 6a perpendicular to the central axis J1 is constant in the vertical direction or gradually decreases upward. Thus, since the projections 6 and 6a do not include an undercut shape, the casings 5 and 5a can be easily and inexpensively manufactured without using a slide mold or the like.

  In the casing 5a of FIG. 5, only one linear protrusion element 63 may be provided. The protrusion 6a includes at least one linear protrusion element 63 having different radial positions at both ends, so that vibration of the lid 51 of the casing 5a when the motor 12 is driven can be significantly suppressed. The linear protrusion element 63 does not necessarily have to be linear, and may be curved.

  When the linear protrusion element 63 is linear, it is preferable that the angle formed between the line connecting the center of each linear protrusion element 63 and the central axis J1 and the linear protrusion element 63 is less than 90 degrees. This makes it easy to smoothly flow the resin on the upper surface 511 of the casing 5a when the motor frame 22 is formed.

  In the stationary part 2, only a part of the stator 21 may be covered with the motor frame 22. That is, the motor frame 22 covers at least a part of the stator 21. Similarly, only a part of the circuit board 23 may be covered with the motor frame 22. That is, the motor frame 22 covers at least a part of the circuit board 23 together with the stator 21.

  Depending on the design of the motor 12, the sleeve may be fixed to the stationary part 2 and the shaft may be fixed to the rotating part 3. In this case, the shaft 41 rotates around the central axis J1 together with the rotating unit 3.

  The pump 1 may be used in an apparatus that involves the transfer of liquid other than a water heater. Moreover, the fluid sent by the pump 1 may be a gas.

  The configurations in the above embodiment and each modification may be combined as appropriate as long as they do not contradict each other.

  The present invention is applicable to various pumps having a motor. Furthermore, it can be used for motors used in addition to pumps.

DESCRIPTION OF SYMBOLS 1 Pump 2 Static part 3 Rotating part 4 Bearing mechanism 5, 5a, 5b Casing 6, 6a Protrusion part 11 Pump casing 12 Motor 21 Stator 22 Motor frame 23 Circuit board 32 Rotor magnet 33 Impeller 51 Cover part 52 Cylindrical part 61-63 Protrusion Element 114 Inlet 115 Outlet 116 Pump chamber 221 Micro gap 222 Through-hole 231 Electronic component 511 Upper surface 512 Non-projection area J1 Central axis

Claims (13)

A cylindrical rotor magnet centered on a central axis facing in the vertical direction and an impeller disposed on the lower side of the rotor magnet, and a rotating part that rotates about the central axis;
A stationary part;
A bearing mechanism that rotatably supports the rotating part with respect to the stationary part;
With
The stationary part is
A covered cylindrical shape centering on the central axis, and a casing in which the rotor magnet is disposed,
A stator surrounding the rotor magnet on the outside of the cylindrical portion of the casing;
A motor frame that fills the upper side of the lid part in the casing and the radially outer side of the cylindrical part, and covers at least a part of the stator;
With
A protrusion is provided on the upper surface of the casing,
The protrusion is disposed on the radially outer side than the central axis , and has a plurality of protrusion elements whose radial positions are different from each other;
The motor, wherein the entire non-projection area excluding the protrusion on the upper surface is one continuous area continuously extending in a direction perpendicular to the central axis.   The motor according to claim 1, wherein the shape of each projecting element when viewed along the vertical direction is a dot shape or a linear shape extending along one direction parallel to the upper surface. A circuit board that extends along the upper surface above the casing and that is at least partially covered with the resin together with the stator;
The motor according to claim 1, wherein a minute gap is provided between an upper end of the protrusion and the circuit board, and the resin is also present in the minute gap.   The motor according to claim 3, wherein a minimum value of a gap between the plurality of protruding elements is larger than the minute gap. Electronic components are provided on the lower surface of the circuit board,
The motor according to claim 3 or 4, wherein the electronic component overlaps the non-projection region when viewed along the vertical direction. The plurality of protruding elements are
A first protruding element disposed on the upper surface at a position closer to the central axis than an outer edge of the upper surface;
A second projecting element disposed on the upper surface at a position closer to the outer edge than the central axis;
Including
An angle formed by a line segment connecting the center of the first projecting element and the central axis and a line segment connecting the center of the second projecting element and the central axis is 90 degrees or more and 180 degrees or less. ,
The motor according to claim 5, wherein the electronic component is disposed between the first protruding element and the second protruding element. A cylindrical rotor magnet centered on a central axis facing in the vertical direction and an impeller disposed on the lower side of the rotor magnet, and a rotating part that rotates about the central axis;
A stationary part;
A bearing mechanism that rotatably supports the rotating part with respect to the stationary part;
With
The stationary part is
A covered cylindrical shape centering on the central axis, and a casing in which the rotor magnet is disposed,
A stator surrounding the rotor magnet on the outside of the cylindrical portion of the casing;
A motor frame that fills the upper side of the lid part in the casing and the radially outer side of the cylindrical part, and covers at least a part of the stator;
With
A protrusion is provided on the upper surface of the casing,
The protrusion has at least one linear protrusion element having different radial positions at both ends;
The motor, wherein the entire non-projection area excluding the protrusion on the upper surface is one continuous area continuously extending in a direction perpendicular to the central axis.   The motor according to claim 7, wherein an angle formed between a line connecting the center of each linear protrusion element and the central axis on the upper surface and each linear protrusion element is less than 90 degrees. A circuit board that extends along the upper surface above the casing and that is at least partially covered with the resin together with the stator;
The motor according to claim 1, wherein a side surface of the motor frame has a gate mark below the circuit board.   When viewed along the vertical direction, an angle formed by a line segment connecting a part of the protrusion and the central axis, and a line segment connecting the gate trace and the central axis is 180 degrees. The motor according to claim 9.   The motor according to claim 1, wherein the motor frame has a through hole penetrating upward from the upper surface. The through hole is located in the center of the upper surface;
The motor according to claim 11, wherein a part of the protrusion is located on a radially outer side of the through hole. A motor according to any one of claims 1 to 12,
A pump casing;
With
The pump casing is
An inlet through which fluid from the outside flows,
An outlet through which the fluid flows out to the outside;
A pump chamber in which the impeller of the motor is disposed and flows the fluid from the inlet to the outlet;
Having a pump.

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