JP2010013946A - Pump structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump structure improved in productivity in structure to hold a shaft or an impeller with a boss portion which is provided on a case member side, in a pump chamber. <P>SOLUTION: An impeller holding boss portion 54 for holding an impeller 26 and a shaft holding boss portion 40 for holding a shaft 42 are provided in a pump chamber 18 of a fluid pump 10. A casing 16 is integrally molded with the impeller holding boss portion 54 by using a resin, and a pump body 30 is integrally molded with the shaft holding boss portion 40 by using the resin. A slide-type heat radiating structure for radiating the heat in a cooling process when molding the resin is provided on a proximal end side and a distal end side of the boss portions 54 and 40. With this structure, cooling time when molding the resin can be shortened, securing dimensional accuracy of the boss portions. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pump structure in which an impeller is supported by a support shaft in a pump chamber.

There is known a fluid pump in which an impeller is rotatably supported by a support shaft fixed to a boss formed in a motor side case in a pump chamber formed between the motor side case and the pump side case ( For example, see Patent Document 1). In this fluid pump, the impeller is prevented from being detached from the support shaft by a retaining member provided at the tip of the support shaft.
JP-A-2005-81736

  By the way, in the conventional technology as described above, it is conceivable to provide an impeller retaining structure not on the support shaft but on the case side, but there is room for improvement in such a structure.

  In view of the above fact, an object of the present invention is to obtain a pump structure capable of improving productivity in a configuration in which a support shaft or an impeller is held in a pump chamber by a boss provided on the case member side. .

  The pump structure according to the first aspect of the present invention is a pump chamber that is at least partially covered with a resin case member, and a support shaft that supports the impeller, and the case member that protrudes into the pump chamber. When the case member is formed by resin molding together with the boss portion formed integrally with the boss portion for holding the support shaft or the impeller and provided on each of the proximal end side and the distal end side of the boss portion. And a heat dissipation structure for radiating heat in the cooling step.

  In the pump structure according to the first aspect, the impeller is supported by the support shaft in the pump chamber. The support shaft or impeller is held at a predetermined position or posture by a boss portion that protrudes from the resin case member into the pump chamber. When a resin case member is molded, the case member is cooled before die cutting.

  By the way, the boss part protruded from the resin case member is easily affected by the dimensional accuracy due to the shrinkage accompanying the cooling during the resin molding. Here, in this pump structure, since the heat dissipating parts are provided on the base end side and the tip end side of the boss part protruding from the case member into the pump chamber, the base of the boss part is provided when the case member is cooled. A heat radiation path toward the end side (case member outer surface side that is the outside of the pump chamber) and a heat radiation path toward the tip end side (pump chamber side) of the boss portion are formed. Thereby, in this pump structure, heat dissipation (cooling) from the boss part is promoted in the cooling process at the time of molding the case member, and the cooling time at the time of molding the case member can be shortened while ensuring the dimensional accuracy of the boss part. .

  Thus, in the pump structure according to the first aspect, productivity can be improved in the configuration in which the support shaft or the impeller is held in the pump chamber by the boss portion provided on the case member side.

  The pump structure according to a second aspect of the present invention is the pump structure according to the first aspect, wherein the heat dissipating structure on the base end side of the boss portion has a recess opening on the side opposite to the pump chamber side in the case member. It is configured to include.

  In the pump structure according to claim 2, heat is radiated toward the outside of the pump chamber by using the inner surface of the recess constituting the heat dissipation structure on the base end side of the boss portion as a heat dissipation surface. With this structure, the heat radiation area can be ensured without increasing the size of the casing in the external report of the pump chamber (such as providing a convex portion), and the heat radiation is good.

  A pump structure according to a third aspect of the present invention is the pump structure according to the second aspect, wherein the concave portion is formed such that a bottom portion is positioned in the boss portion.

  In the pump structure according to the third aspect, since the bottom of the concave portion extends beyond the thickness of the case member to reach the inside of the boss portion, a larger heat radiation area can be secured and the heat radiation performance is further improved.

  The pump structure according to a fourth aspect of the present invention is the pump structure according to the second or third aspect, wherein the recess has a tapered shape whose opening end side is wider than the bottom side.

  In the pump structure according to claim 4, since the concave portion (the inner surface thereof) has a tapered shape (for example, a conical surface having a larger area than the cylindrical surface), a larger heat radiation area can be ensured, and the heat radiation performance is improved. Even better.

  The pump structure according to a fifth aspect of the present invention is the pump structure according to any one of the second to fourth aspects, wherein the heat dissipating structure on the base end side of the boss portion is open from the bottom of the recess. It is comprised including the convex part protruded to the side.

  In the pump structure according to the fifth aspect, since the heat dissipation structure on the base end side of the boss portion has the convex portion in the concave portion, heat can be radiated using the inner surface of the concave portion and the outer surface of the convex portion as the heat radiating surface. For this reason, in this pump structure, a larger heat radiation area can be secured, and the heat radiation performance is further improved.

  The pump structure according to a sixth aspect of the present invention is the pump structure according to any one of the first to fifth aspects, wherein the boss portion is a hollow structure that opens at the tip side or a part of the support shaft. Has an insert structure in which another part of the support shaft is inserted so that it protrudes from the tip, and the heat dissipation structure on the tip side of the boss portion is formed by resin molding together with the boss portion. At this time, the heat of the mold inserted into the boss part or the support shaft is radiated from the tip side of the boss part.

  7. The pump structure according to claim 6, wherein in the heat dissipating structure on the distal end side of the boss portion, the heat of the support shaft or the mold (including the case where it is nested) is radiated to the distal end side of the boss portion, In the side heat dissipation structure, the heat of the support shaft or the mold is dissipated toward the base end side of the boss portion. As a result, two heat dissipation paths that do not interfere with each other are secured as described above, and the cooling time when the case member is molded is shortened. In particular, in a configuration (a second aspect of the invention, particularly a third aspect) in which a heat dissipation structure including a concave portion is employed as a heat dissipation structure on the base end side of the boss portion, a support shaft or a die that is a heat dissipation target by forming the concave portion. In other words, since the heat capacity of the heat dissipation target is reduced, the amount of heat to be radiated can be reduced, and the cooling time at the time of molding the case member can be further shortened. .

  A pump structure according to a seventh aspect of the present invention is the pump structure according to any one of the first to sixth aspects, wherein the pump structure is configured as the case member, and one end of the support shaft is formed by insert molding of the support shaft. A pump body integrally formed with the boss portion, the side of which protrudes from the tip and the other end of the support shaft is fixedly held, and the pump body is configured as the case member that forms the pump chamber; A casing formed integrally with the boss portion for holding the impeller with respect to the support shaft at a distal end portion, and a proximal end of both the boss portion of the pump body and the boss portion of the casing The heat dissipation structure is provided on each of the side and the tip side.

  In the pump structure according to claim 7, the impeller is supported by one end side of the support shaft, the other end of which is fixed to the boss portion of the pump body, that is, a portion protruding into the pump chamber, and the impeller is a tip of the boss portion of the casing. It is held (for example, retaining etc.) with respect to the spindle by the portion. Accordingly, the support shaft and the impeller are held and positioned at specific positions in the pump chamber by the boss portions of the pump body and the casing. Here, in this pump structure, each boss part of the pump body and casing has a heat dissipation structure on the base end side and the tip end side, so that the dimensional accuracy of each boss part can be reduced while shortening the cooling time at the time of molding the case member. The supporting shaft and impeller dimensions (position and orientation) that are ensured and held and positioned by these boss portions are excellent.

  A fluid pump 10 as a pump device to which a pump structure according to an embodiment of the present invention is applied will be described with reference to FIGS. First, the overall configuration of the fluid pump 10 will be described, and then the shaft 42 and the impeller 26 holding structure, and the shaft support boss 40 and the impeller holding boss part 54 constituting the main part of the holding structure, which are the main parts of the present invention. The heat dissipation structure will be described in detail.

(Overall configuration of fluid pump)
FIG. 1 shows a schematic overall configuration of the fluid pump 10 in a side sectional view. As shown in this figure, the fluid pump 10 includes a pump unit 12 and a motor unit 14 arranged side by side in the motor axial direction.

  The pump unit 12 has a casing 16 as a case member in the present invention. The casing 16 is formed in a substantially stepped cylindrical shape in which a bottomed cylindrical small diameter portion 16B is coaxially connected to a bottom portion of a large diameter portion 16A having a bottomed cylindrical shape. The casing 16 is configured such that the open end of the large-diameter portion 16A is closed by a pump body 30 which will be described later, and its internal space is a pump chamber 18.

  The casing 16 has a suction port (suction) 20 projecting along the tangential direction from the bottom side portion of the small-diameter portion 16B (inside space) and a tangential direction from the pump chamber 18 in the large-diameter portion 16A. And a discharge outlet discharge) 22 that protrudes. The suction port 20 and the discharge port 22 are in communication with each other via the pump chamber 18.

  An impeller 26 having a plurality of blades 24 is arranged on the inner portion of the large-diameter portion 16A in the pump chamber 18 so as to be rotatable about its own axis. The impeller 26 is configured to suck fluid from the suction port 20 as it rotates in a predetermined direction, and to transport the fluid in the pump chamber 18 to the outside in the radial direction and to discharge (pressure feed) from the discharge port 22 to the outside. Yes.

  The motor unit 14 includes a stator 28, a pump body 30 as a case member in the present invention, a housing 32, a rotor 34, and a control circuit 36 as main parts. The pump body 30 has a large-diameter portion 30A having a bottomed cylindrical shape that opens to the opposite side to the pump portion 12 side, and a bottomed cylindrical shape that penetrates the bottom plate portion of the large-diameter portion 30A and opens to the pump portion 12 side. The small-diameter portion 30B is formed in a substantially double cylindrical shape coaxially and integrally provided. The pump body 30 includes a flange portion 30C extending radially outward from the opening end of the large diameter portion 30A, and a flange portion extending radially outward from the opening end of the large diameter portion 16A in the casing 16. It is joined to 16C by a fastening means (not shown) or an engaging means such as a snap fit.

  Accordingly, the pump chamber 18 can be regarded as being configured by being surrounded by the casing 16 and the pump body 30, and the pump chamber 18 is a rotor chamber formed in the small diameter portion 30 </ b> B of the pump body 30. 38. A shaft support boss 40 as a boss portion protrudes from the bottom plate portion of the small diameter portion 30 </ b> B toward the pump chamber 18. The shaft support boss 40 holds (supports) the other end side of the shaft 42 as a support shaft for rotatably supporting the impeller 26 at one end side. The impeller 26 is supported on the shaft support boss 40 via a plain bearing 44 so as to be coaxial and relatively rotatable. In this embodiment, a washer 46 is interposed between the tip of the shaft support boss 40 and the slide bearing 44.

  A rotor 34 is disposed in the rotor chamber 38 of the pump body 30 so as to be rotatable around the axis of the pump unit 12. In this embodiment, the rotor 34 is fixed (integrated) to the impeller 26 in the pump chamber 18, and the shaft 42 is rotatable relative to the pump body 30 via the impeller 26 and the slide bearing 44. It can be regarded as being pivotally supported.

  On the other hand, a space between the large-diameter portion 30A and the small-diameter portion 30B of the pump body 30 is a stator chamber 48. A stator 28 is accommodated in the stator chamber 48 of the pump body 30. The stator 28 has a substantially annular shape, and is integrally provided with a core, a coil, and the like. The stator 28 is fixedly held in the stator chamber 48 of the pump body 30 by press-fitting the small diameter portion 30B therein.

  Further, the open end of the large diameter portion 30 </ b> A in the pump body 30 (that is, the stator chamber 48 of the pump body 30) is closed by the housing 32. The housing 32 is joined to the pump body 30 by a plurality of snap fit portions 50 provided along the circumferential direction. In this embodiment, the board portion 36 </ b> A of the control circuit 36 is held by the housing 32, and the control circuit 36 is positioned in the pump body 30 when the housing 32 is joined by the pump body 30.

  The control circuit 36 is electrically connected to a coil constituting the stator 28, and receives a control signal output from an external control (power supply) device (not shown) connected via a connector 52 provided in the housing 32. Accordingly, a current is supplied to the coil of the stator 28. In the fluid pump 10, when a control signal is output from the external control device, the stator 28 generates a rotating magnetic field, and the rotor 34 is rotated together with the impeller 26 in a predetermined direction by the rotating magnetic field. With the rotation of the impeller 26 in a predetermined direction, as described above, fluid is sucked into the pump chamber 18 from the outside through the suction port 20, and fluid in the pump chamber 18 is discharged from the discharge port 22 to the outside. Has been.

  The fluid pump 10 described above can be configured as, for example, a water pump for circulating cooling water of an internal combustion engine mounted on an automobile or the like.

(Shaft and impeller holding structure)
As described above, in the fluid pump 10, the impeller 26 is rotatably supported by the shaft 42 fixedly held by the shaft support boss 40. In the fluid pump 10, the impeller 26 is prevented from falling off the shaft 42 by the impeller holding boss portion 54 as a boss portion provided in the casing 16. This will be specifically described below.

  As shown in FIG. 1, the impeller holding boss portion 54 protrudes coaxially with the shaft 42 from the bottom plate portion 56 constituting the small diameter portion 16B of the casing 16 toward the pump chamber 18 (large diameter portion 16A). Yes. The impeller holding boss portion 54 is configured as a hollow structure (cylindrical shape) in which the axial center portion is a cavity 55, and at least a part (opening end portion) on the distal end side has an inner diameter of the shaft 42. A shaft relief portion 54A having a larger diameter than the outer diameter is provided.

  The impeller holding boss portion 54 has an annular wall portion 54B surrounding the shaft escape portion 54A opposed to the impeller 26 (slide bearing 44) at a predetermined interval in a state where the tip of the shaft 42 is inserted into the shaft escape portion 54A. The contact prevents the impeller 26 from coming off the shaft 42. In this embodiment, a washer 58 is interposed between the end face of the slide bearing 44 and the annular wall portion 54B. The annular wall portion 54B is opposed to the washer 58 that faces or contacts the slide bearing 44 at a minute interval. Thus, it is configured to confront or contact at a predetermined interval.

(Heat dissipation structure of shaft support boss and impeller holding boss)
The impeller holding boss portion 54 described above is formed integrally with the resin casing 16. In this embodiment, the impeller holding boss portion 54 is integrally formed with the casing 16 by resin injection molding. As described above, when the casing 16 including the hollow impeller holding boss portion 54 having the cavity 55 in the axial center portion is formed by injection molding, after the resin is filled in the mold, the resin is cooled ( (Solidification) step is performed.

  In this cooling step, the heat of the mold portion (in this embodiment, a slide mold as a nesting) located in the impeller holding boss portion 54 is radiated to form the cavity 55. As shown in FIG. 2, the impeller holding boss portion 54 constituting the fluid pump 10 releases the heat of the slide mold to the small diameter portion 16B side (the cavity side which is a mold for forming) as indicated by an arrow A. The first heat dissipation structure 60 and the second heat dissipation structure 62 for releasing the heat of the slide mold to the large diameter portion 16A side (the core side which is a mold portion forming the same) as indicated by an arrow B are provided.

  The first heat radiating structure 60 is configured to have a concave portion 64 that opens in the opposite direction to the pump chamber 18 side at the axial center portion of the bottom plate portion 56 of the small diameter portion 16B. The concave portion 64 has a depth that exceeds the thickness of the bottom plate portion 56 and reaches part of the axial direction in the impeller holding boss portion 54. Therefore, in this embodiment, the recessed wall 64 </ b> A surrounding the recessed portion 64 in the impeller holding boss portion 54 faces the pump chamber 18. Further, the recess 64 is formed in a tapered shape in which the opening end is wider than the bottom (a partition wall 66 described later) in an area along a plane orthogonal to the motor axial direction.

  In the impeller holding boss portion 54 (first heat dissipation structure 60), a partition wall portion 66 serving as a bottom portion is formed between the recess portion 64 and the cavity 55, and the recess portion 64, the cavity 55, Is not connected. The first heat dissipation structure 60 has a protrusion 68 that protrudes from the partition wall 66 into the recess 64. The convex portion 68 is formed in a tapered shape with a base portion thicker than the tip portion. The convex portion 68 is formed as a gate trace which is a trace of the gate G for injecting resin from the runner R to the mold during the injection molding of the casing 16 and the impeller holding boss portion 54.

  On the other hand, the second heat radiating structure 62 is simply structured to open to the tip side of the impeller holding boss portion 54 (structure having a shaft escape portion 54A). That is, the second heat radiating structure 62 is configured to directly radiate heat from the shaft 42 that is a heat radiating target.

  The shaft support boss 40 is integrally formed with the resin pump body 30. In this embodiment, the shaft support boss 40 is integrally formed with the pump body 30 by resin injection molding. In this embodiment, the other end side of the shaft 42 is fixedly held by the shaft support boss 40 by insert molding of the shaft 42 as described above. When the pump body 30 including the shaft support boss 40 that holds the shaft 42 in the axial center portion is formed by injection molding as described above, the resin is cooled (solidified) after filling the mold. Will be performed.

  In this cooling process, the heat of the shaft 42 is dissipated. Then, as shown in FIG. 3, the shaft support boss 40 constituting the fluid pump 10 releases the heat of the shaft 42 to the large diameter portion 16A side (the core side which is a mold for forming) as indicated by the arrow C. The first heat dissipation structure 70 and the second heat dissipation structure 72 that allows the heat of the slide mold to escape to the opening end side of the small diameter portion 16B (the cavity side that is a mold part forming the same) as indicated by an arrow D are included.

  The first heat radiating structure 70 is configured to have a concave portion 74 that opens in the opposite direction to the pump chamber 18 (rotor chamber 38) side at the axial center portion of the bottom plate portion 76 of the small diameter portion 30B. The recess 74 has a depth that exceeds the thickness of the bottom plate portion 76 of the small diameter portion 30 </ b> B of the pump body 30 and reaches a part in the axial direction in the shaft support boss 40. Therefore, in this embodiment, the concave wall 74A surrounding the concave portion 74 in the shaft support boss 40 faces the rotor chamber 38 (that is, the pump chamber 18). In the shaft support boss 40 (first heat dissipation structure 70), a partition wall 78 serving as a bottom portion is formed between the shaft 42 inserted into the shaft support boss 40 and the recess 74.

  On the other hand, the second heat radiating structure 72 has a structure in which the other end side of the shaft 42 is simply protruded from the shaft support boss 40. That is, the second heat dissipation structure 72 is configured to directly dissipate heat from the shaft 42 that is a heat dissipation target.

  Next, the operation of the present embodiment will be described.

  In the fluid pump 10 configured as described above, when a control signal is output from the external control device, a current corresponding to the control signal is supplied from the control circuit 36 to the stator 28. Thereby, the rotor 34 rotates in a predetermined direction at a speed and torque according to the control signal together with the impeller 26. Then, the fluid is sucked from the suction port 20 and the fluid is discharged from the discharge port 22 by the rotation of the impeller 26.

  At this time, the impeller 26 supported by the shaft support boss 40 fixed to the shaft support boss 40 of the pump body 30 in the pump chamber 18 is in a state in which the impeller 26 is prevented from dropping from the shaft 42 by the impeller holding boss portion 54. , Rotate around the shaft support boss 40.

  By the way, in the resin casing 16 and the pump body 30 constituting the fluid pump 10, the shaft support boss 40 and the impeller holding boss portion 54 are integrally formed by resin injection molding. In the cooling process in the manufacturing process by the injection molding, the heat of the shaft support boss 40, the slide mold located in the impeller holding boss portion 54, and the shaft 42 is radiated.

  Here, in the present fluid pump 10, the first heat dissipation structure 60 and the second heat dissipation structure 62 are provided on the impeller holding boss portion 54 of the casing 16, and the first heat dissipation structure 70 and the second heat dissipation structure 70 of the shaft support boss 40 of the pump body 30 are provided. Two heat dissipation structures 72 are provided. For this reason, in this fluid pump 10, while ensuring the dimensional accuracy of the casing 16, the shaft support boss 40 formed integrally with the pump body 30, and the impeller holding boss portion 54, the cooling time at the time of injection molding is shortened. be able to.

  This point will be described in comparison with a comparative example shown in FIG. The pump body 100 according to the comparative example shown in FIG. 4 is configured such that the impeller holding boss portion 102 is integrally formed and has the heat dissipation structure 104 corresponding to the second heat dissipation structure 62, but the first heat dissipation structure 60. No heat dissipation structure corresponding to For this reason, in the cooling process at the time of injection molding of the pump body 100, the heat of the slide mold located in the impeller holding boss portion 102 is radiated mainly in the arrow B direction. Thus, in the pump body 100 according to the comparative example, since cooling is performed from one direction, the cooling efficiency around the impeller holding boss portion 102 is low, and the impeller holding boss portion 102 is deformed in the collapse direction due to resin contraction. In order to suppress it, it is necessary to set a long cooling time.

  On the other hand, in the fluid pump 10 according to the embodiment of the present invention, the impeller holding boss portion 54 of the casing 16 has the first heat dissipation structure 60 and the second heat dissipation structure 62, so that the slide type heat is shown in FIG. 2. Heat is dissipated mainly from the two directions indicated by arrows A and B. Thereby, falling of the impeller holding | maintenance boss | hub part 54 can be suppressed, shortening the cooling time of the injection molding character of the casing 16. FIG. In other words, as described above, the cooling time at the time of injection molding of the casing 16 can be shortened and the number of molding steps can be reduced while ensuring the dimensional accuracy of the impeller holding boss portion 54.

  Similarly, in the fluid pump 10, since the shaft support boss 40 of the pump body 30 has the first heat dissipation structure 70 and the second heat dissipation structure 72, the heat of the shaft 42 is from two directions indicated by arrows C and D shown in FIG. Heat is mainly dissipated. Thereby, falling of the shaft support boss 40 can be suppressed while shortening the cooling time of the injection-molded letter of the pump body 30. In other words, as described above, the cooling time at the time of injection molding of the pump body 30 can be shortened and the number of molding steps can be reduced while ensuring the dimensional accuracy of the shaft support boss 40.

  Moreover, the recessed part 64 which comprises the 1st heat radiating structure 60 of the impeller holding | maintenance boss | hub part 54, and the recessed part 74 which comprises the 1st heat radiating structure 70 of the shaft support boss | hub 40 have the thickness of the baseplate parts 56 and 76 in which the base end continues. Since it has the depth which reaches the inside of the corresponding bosses 54 and 40, the heat radiation area is widened and the cooling efficiency is improved.

  In particular, since the concave portion 64 constituting the first heat dissipation structure 60 of the impeller holding boss portion 54 has a tapered shape, the heat dissipation area is further increased and the cooling efficiency is further improved. In particular, since the first heat dissipation structure 60 of the impeller holding boss portion 54 has the convex portion 68 in the concave portion 64, the outer surface of the convex portion 68 can also be a heat radiating surface. Moreover, since the convex portion 68 also has a tapered shape, the heat radiating surface of the convex portion 68 is wide. As described above, in the first heat radiating structure 60, the heat radiating surface that is the outer surface of the convex portion 68 and the heat radiating surface that is the inner surface of the concave portion 64 are combined, so that a wider heat radiating area is obtained and the cooling efficiency is further improved.

  Further, in the fluid pump 10, the first heat dissipation structure 60, 70 is configured to have the recesses 64, 74, so that the casing 16 and the pump body 30 are thicker, for example, in a configuration that secures a heat dissipation area with a convex structure. A heat dissipation structure can be configured without providing a meat part. On the other hand, since the convex portion 68 of the first heat dissipation structure 60 is formed using a gate mark for injecting resin into the mold during injection molding, the heat dissipation area can be reduced without affecting moldability. It can be secured and is located in the recess 64, so that it does not affect the appearance.

  Furthermore, in the fluid pump 10, since the first heat dissipation structure 60 is configured to have the recess 64, the base end portion (first heat dissipation structure 60) of the impeller holding boss portion 54 is the comparative example of FIG. Unlike the base end portion 102 </ b> A of the impeller holding boss portion 102, the thick portion is not formed. That is, in the impeller holding boss portion 54 constituting the fluid pump 10, each portion around the base end portion (the bottom plate portion 56, the concave wall 64 </ b> A, the partition wall portion 66, etc.) is smoothed, and thus easily deforms due to resin contraction. The thick part is not formed, and the dimensional accuracy against the falling of the impeller holding boss part 54 is improved. Similarly, in the shaft support boss 40, by providing the concave portion 74, the thickness of the base end side (partition wall portion 78) can be suppressed to be small, and the dimensional accuracy against falling can be improved.

  In the fluid pump 10, the pump structure according to the present invention having the heat radiation structure on both sides in the axial direction is applied to both the impeller holding boss portion 54 of the casing 16 and the shaft support boss 40 of the pump body 30. In addition, the number of man-hours for forming the pump body 30 can be reduced. In the fluid pump 10, the shaft 42, the impeller holding boss portion 54 of the casing 16 that holds the impeller 26 from both sides in the axial direction, and the shaft support boss 40 of the pump body 30 each have a heat dissipation structure on both sides in the axial direction. Since the pump structure according to the invention is applied, in other words, both the impeller holding boss portion 54 and the shaft support boss 40 can be formed with high dimensional accuracy against falling down. Therefore, the casing 16 and the pump body 30 are shown in FIG. The shaft 42 and the impeller 26 can be supported and held with high accuracy in the assembled state as shown. Thereby, in the fluid pump 10, the shafts 42 and 26 can be swung around, and an effect of suppressing vibration caused by the shafts can be obtained.

  In the above-described embodiment, an example in which the pump structure according to the present invention is applied to both the casing 16 and the pump body 30 is shown. However, the present invention is not limited to this, and any of the casing 16 and the pump body 30 is used. Alternatively, the pump structure according to the present invention may be applied. In this case, the member to which the pump structure according to the present invention is not applied is not limited to a resinous structure or a structure in which a boss portion is integrally formed, and various materials and structures that can perform the function are used. Can be configured.

  In the above-described embodiment, the example in which the gate G is set in the concave portion 64 of the casing 16 has been described. However, the present invention is not limited to this, and for example, the gate may not be set in the concave portion 64. good. In this case, it is good also as a structure which does not have the convex part 68, and it is good also as a structure which forms the convex part 68 with a metal mold | die.

It is a sectional side view of the fluid pump which concerns on embodiment of this invention. It is a sectional side view which shows the cross section different from FIG. 1 of the casing which comprises the fluid pump which concerns on embodiment of this invention. It is a sectional side view which shows the cross section different from FIG. 1 of the pump body which comprises the fluid pump which concerns on embodiment of this invention. It is a sectional side view which shows the casing which concerns on a comparative example with embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fluid pump (pump structure), 16 ... Casing (case member), 18 ... Pump chamber, 26 ... Impeller, 30 ... Pump body (case member), 40 ... Shaft Support boss (boss part), 42 ... shaft (support shaft), 54 ... impeller holding boss part (boss part), 60.62 ... heat radiation structure, 64 ... concave, 68 ... convex Part, 70 ・ 72 ・ ・ ・ Heat dissipation structure

Claims (7)

A support shaft that supports the impeller in a pump chamber at least partially covered with a resin case member;
A boss portion formed integrally with the case member so as to protrude into the pump chamber, and holding the support shaft or impeller;
A heat dissipating structure that is provided on each of the base end side and the front end side of the boss part, and dissipates heat in the cooling step when the case member is molded with the boss part by resin molding,
With pump structure.   2. The pump structure according to claim 1, wherein the heat dissipation structure on the base end side of the boss portion includes a recess opening on the opposite side to the pump chamber side in the case member.   The pump structure according to claim 2, wherein the concave portion is formed such that a bottom portion is positioned in the boss portion.   The pump structure according to claim 2 or 3, wherein the concave portion has a tapered shape whose opening end side is wider than the bottom side.   The pump structure according to any one of claims 2 to 4, wherein the heat dissipation structure on the base end side of the boss portion includes a protrusion protruding from the bottom of the recess toward the opening end. . The boss portion has a hollow structure that opens on the tip side, or an insert structure in which another part of the support shaft is inserted so that a part of the support shaft protrudes from the tip,
When the case member is molded together with the boss portion by resin molding, the heat dissipating structure on the tip side of the boss portion is configured to transfer the heat of the mold inserted into the boss portion or the support shaft to the tip side of the boss portion. The pump structure according to any one of claims 1 to 5, wherein the pump structure is configured to dissipate heat. A pump body configured as the case member and integrally formed with the boss portion by which one end side of the support shaft protrudes from the tip end and the other end side of the support shaft is fixedly held by insert molding of the support shaft. When,
The casing is configured as the case member that forms the pump chamber with the pump body, and the casing is formed integrally with the boss portion for holding the impeller with respect to the support shaft at the tip portion.
The pump according to any one of claims 1 to 6, wherein the heat dissipation structure is provided on each of a proximal end side and a distal end side of both the boss portion of the pump body and the boss portion of the casing. Construction.

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