JP6671048B2 - pump - Google Patents

Description

  The present invention relates to a pump.

  2. Description of the Related Art Conventionally, there is known a pump including a rotating body integrally provided with a rotor and an impeller, and a separation plate provided with a housing portion for housing the rotor (for example, see Patent Document 1).

  In Patent Literature 1, a suppressor that suppresses foreign matter contained in a liquid from flowing into a space between a rotor and a separation plate is provided on an outer periphery of an impeller. As described above, by providing the suppressing portion on the outer periphery of the impeller, the rotor can be maintained rotatably, and it is possible to suppress a decrease in pump efficiency.

JP 2014-194190A

  With the above-described conventional configuration, it is possible to suppress a decrease in the pump efficiency. However, it is preferable that the decrease in the pump efficiency can be more reliably suppressed.

  Therefore, an object of the present invention is to provide a pump that can more reliably suppress a decrease in pump efficiency.

  In order to achieve the above object, a pump according to the present invention includes a pump body having a suction path formed with a suction port for sucking a liquid, and a discharge path formed with a discharge port for discharging the sucked liquid. An impeller housed in a pump chamber formed in the pump body, and a shaft rotatably supporting the impeller.

  Further, a pump flow path from the suction port to the discharge port is formed in the pump body.

  The pump flow path is formed in the suction path, the impeller, and an impeller flow path into which the liquid in the suction path is introduced.The pump flow path is formed radially outside the impeller. A volute section into which the liquid is introduced; and the discharge path through which the liquid in the volute section is introduced.

  In addition, a liquid separation suppressing structure for suppressing separation of the liquid flowing in the pump flow path is provided in the pump flow path.

  As a result, the liquid flowing in the pump flow path can be prevented from peeling or staying, and the pump efficiency can be more reliably prevented from lowering. Become.

  ADVANTAGE OF THE INVENTION According to this invention, the pump which can suppress that a pump efficiency falls can be suppressed more reliably can be obtained.

It is a figure which shows the pump concerning Embodiment 1 of this invention, (a) is a top view and (b) is a side view. FIG. 2 is a perspective view showing the pump according to the first embodiment of the present invention in a partially exploded manner. It is AA sectional drawing of FIG.1 (a). It is BB sectional drawing of FIG.1 (b). FIG. 2 is a perspective view illustrating a casing according to the first embodiment of the present invention. FIG. 2 is a rear view showing the casing according to the first embodiment of the present invention. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. 4 is a graph schematically illustrating a relationship between a position of a volute portion and a cross-sectional area according to the first embodiment of the present invention. FIG. 3 is an enlarged sectional view showing a volute portion according to the first embodiment of the present invention. FIG. 2 is a side view of the pump according to the first embodiment of the present invention, in a state where a discharge port faces the front. It is a side view which expands and shows the discharge opening concerning Embodiment 1 of this invention. FIG. 2 is a rear view showing the casing according to the first embodiment of the present invention. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is GG sectional drawing of FIG. It is HH sectional drawing of FIG. It is II sectional drawing of FIG. It is JJ sectional drawing of FIG. It is KK sectional drawing of FIG. It is LL sectional drawing of FIG. 4 is a graph schematically showing a relationship between a position of a discharge furnace path and a cross-sectional area according to the first embodiment of the present invention. It is sectional drawing which expands and shows the flow direction change part concerning Embodiment 1 of this invention. FIG. 2 is a side view showing the rotating body according to the first embodiment of the present invention. FIG. 25 is a sectional view taken along line MM of FIG. 24. FIG. 2 is a perspective view illustrating a blade portion and a front shroud according to the first embodiment of the present invention. FIG. 2 is an enlarged sectional view showing the centrifugal flow channel according to the first embodiment of the present invention. It is a perspective view which shows the blade part and front shroud concerning the modification of Embodiment 1 of this invention. It is a top view showing a pump concerning Embodiment 2 of the present invention. FIG. 30 is an NN cross-sectional view of FIG. 29. It is sectional drawing which expands and shows the volute part concerning Embodiment 2 of this invention. It is a perspective view showing a casing concerning Embodiment 2 of the present invention. FIG. 9 is a rear view showing a casing according to the second embodiment of the present invention. FIG. 34 is a sectional view taken along the line O-O in FIG. 33. FIG. 34 is a sectional view taken along line PP of FIG. 33.

  A pump according to an embodiment of the present invention includes a pump body having a suction path formed with a suction port for sucking a liquid, and a discharge path formed with a discharge port for discharging the sucked liquid, and the pump The pump includes an impeller housed in a pump chamber formed in the main body, and a shaft rotatably supporting the impeller.

  Further, a pump flow path from the suction port to the discharge port is formed in the pump body.

  The pump flow path is formed in the suction path, the impeller, and an impeller flow path into which the liquid in the suction path is introduced.The pump flow path is formed radially outside the impeller. A volute section into which the liquid is introduced; and the discharge path through which the liquid in the volute section is introduced.

  In addition, a liquid separation suppressing structure for suppressing separation of the liquid flowing in the pump flow path is provided in the pump flow path.

  As a result, the liquid flowing in the pump flow path can be prevented from peeling or staying, and the pump efficiency can be more reliably prevented from lowering. Become.

  In addition, an opening is formed on the radially inner side of the volute portion so as to face a discharge port formed on the radially outer side of the impeller channel. Further, an inclined surface is formed on the inner surface of the volute portion so that the axial length of the volute portion becomes longer toward the outside in the radial direction from the edge on the opening side. And the liquid separation suppressing structure includes the inclined surface.

  Thus, the liquid introduced into the volute can flow along the inclined surface, and the liquid can be more smoothly introduced into the volute. As a result, it is possible to suppress the liquid flowing in the volute portion from peeling or staying.

  The inclined surface is formed such that a radial cross section of the volute portion is straight.

  As a result, the axial length of the volute portion linearly increases radially outward from the edge on the opening side. As a result, the liquid in the impeller channel can be more smoothly introduced into the volute portion, and the separation or stagnation of the liquid can be more reliably suppressed.

  Further, the pump flow path includes a rectifying section formed between the impeller flow path and the volute section, and the liquid separation suppressing structure includes the rectifying section.

  As a result, the liquid discharged from the impeller flow path is rectified by the rectifying section and then introduced into the volute section, so that the liquid is more surely separated or stayed. It can be suppressed.

  The rectifying section is formed such that a radial cross section is a straight line extending in the radial direction.

  Thus, the liquid discharged from the impeller channel can be rectified in the radial direction, which is the direction of introduction into the volute portion.

  Further, the discharge path is formed such that the contour shape of the flow path cross section of the discharge path gradually becomes a perfect circle from the end point side of the volute portion toward the discharge port, and the liquid separation suppressing structure is formed. Includes the discharge path.

  This makes it possible to prevent the liquid flowing in the discharge path from peeling or staying.

  Further, the cross-sectional area of the flow path of the discharge path linearly increases from the end point side of the volute portion to the discharge port.

  This allows the liquid in the discharge path to flow more smoothly toward the discharge port, thereby making it possible to more reliably prevent the liquid from peeling off or remaining.

  Further, the impeller includes a plurality of blade portions for increasing the pressure of the liquid by rotational centrifugal force, a first shroud for covering one axial side of the blade portion, and a second shroud for covering the other axial side of the blade portion. And a shroud.

  The impeller channel is defined by the two blades adjacent to each other, the first shroud and the second shroud, and has an inlet formed radially inward and a discharge outlet radially outward. An outlet is provided with a centrifugal flow path. Further, the impeller flow path is formed radially inside the centrifugal flow path, a liquid is introduced from the suction path, and an introduction path for introducing the introduced liquid from the introduction port into the centrifugal flow path. Have.

  Here, in the introduction path, the first shroud side is an upstream side, and the second shroud side is a downstream side, and the centrifugal flow path has an inner surface on the second shroud side extending in a radial direction. It is a side to do.

  Further, the direction in which the liquid mainly flows when introduced into the introduction path and the direction in which the liquid mainly flows when introduced from the introduction path into the centrifugal flow path intersect.

  Further, in the introduction path, a tip is formed so that a tip is tapered, and a flow direction changing part for changing the flow of the liquid is arranged in a state where the tip is directed to the upstream side. Are formed so as to form a circular arc line projecting toward the center in a radial cross-sectional view.

  The flow direction changing unit is disposed in the introduction path such that a virtual extension line of the arc line is in contact with the inner surface of the centrifugal flow passage on the second shroud side, and the liquid separation suppressing structure is provided. Includes the surface of the flow direction changing portion.

  Thereby, the flow direction of the liquid introduced into the introduction path from the suction path can be changed more smoothly, and the liquid in the introduction path can be easily introduced into the centrifugal flow path. As a result, it is possible to suppress the liquid flowing in the impeller channel from peeling off or remaining.

  Further, the impeller includes a plurality of blade portions for increasing the pressure of the liquid by rotational centrifugal force, a first shroud for covering one axial side of the blade portion, and a second shroud for covering the other axial side of the blade portion. And a shroud.

  The impeller channel is defined by the two blades adjacent to each other, the first shroud and the second shroud, and has an inlet formed radially inward and a discharge outlet radially outward. An outlet is provided with a centrifugal flow path. Further, the impeller flow path is formed radially inside the centrifugal flow path, a liquid is introduced from the suction path, and an introduction path for introducing the introduced liquid from the introduction port into the centrifugal flow path. Have.

  Here, in the introduction path, the first shroud side is the upstream side, and the second shroud side is the downstream side, and the direction in which the liquid mainly flows when introduced into the introduction path, and the centrifugal flow The direction in which the liquid mainly flows when discharged from the discharge port of the road intersects.

  Further, an inner surface of the centrifugal flow passage on the first shroud side is formed so as to have a contour that is convex toward the second shroud side in a radial cross-sectional view.

  The contour line is such that the direction of the tangent line at the end of the centrifugal flow channel on the inlet side is the direction in which the liquid mainly flows when the liquid is introduced into the inlet channel. Further, in the contour line, the direction of the tangent line at the end of the centrifugal flow channel on the discharge port side is the direction in which the liquid mainly flows when the liquid is discharged from the discharge port of the centrifugal flow channel.

  Further, the liquid separation suppressing structure includes an inner surface of the centrifugal flow passage on the first shroud side.

  As a result, the flow direction of the liquid flowing in the centrifugal flow path can be changed more smoothly, and the liquid flowing in the centrifugal flow path is prevented from peeling or staying. Will be able to

  Further, the impeller includes a plurality of blade portions for increasing the pressure of the liquid by rotational centrifugal force, a first shroud for covering one axial side of the blade portion, and a second shroud for covering the other axial side of the blade portion. And a shroud.

  Here, the impeller channel is defined by two blades adjacent to each other, the first shroud and the second shroud, and an inlet is formed radially inward and radially outward. It has a centrifugal flow path in which a discharge port is formed.

  The cross-sectional area of the centrifugal flow path linearly increases from the inlet side to the discharge port of the centrifugal flow path, and the liquid separation suppressing structure includes the centrifugal flow path.

  As a result, the liquid in the centrifugal flow path can flow more smoothly, and the liquid flowing in the centrifugal flow path can be prevented from peeling or staying. Become.

  The impeller is provided so as to extend from the inner side to the outer side in the radial direction, and includes a plurality of blade portions for increasing the pressure of the liquid by a rotational centrifugal force.

  The blade portion is formed such that a radially inner end portion is tapered, and the liquid separation suppressing structure includes the blade portion.

  Thus, it is possible to suppress the liquid introduced into the centrifugal flow path from the introduction path from interfering with the radially inner end of the blade portion, and more smoothly introduce the liquid into the centrifugal flow path. Will be able to do it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment. In the following description, the rotation axis direction of the impeller is defined as the front-back direction, and the suction port side in the rotation axis direction is defined as the front side.

  Further, a plurality of embodiments described below include similar components. Therefore, in the following, the same components are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1)
As shown in FIGS. 1 and 2, the pump 1 according to the first embodiment includes a pump body 10 forming an outer shell and a rotating body 20 housed in a rotating body storage chamber 510 formed in the pump body 10. And

  The pump body 10 includes a casing 30 in which a pump chamber 330 that opens rearward is formed, and a drive block 40 in which a storage section 450 that opens frontward is formed (see FIG. 2). That is, the drive block 40 is located behind the casing 30.

  A storage section 450 of the drive block 40, which will be described later, communicates with the pump chamber 330 of the casing 30. The storage section 450 and the pump chamber 330 form a rotary body storage chamber 510 that stores the entire rotary body 20.

  As shown in FIG. 3, the drive block 40 includes a separation plate 410, a magnetic drive unit 460, a control unit 470, and a mold resin 480 forming an outer shell.

  The separation plate 410 is made of a synthetic resin, and can be formed of, for example, polyphenylene sulfide (PPS) resin. Note that the separation plate can be formed using a metal that does not affect magnetic driving.

  The separation plate 410 is formed in a cylindrical shape having a bottom and opened forward, and has a bottom 420, a peripheral wall 430 extending forward from the outer periphery of the bottom 420, and a front edge of the peripheral wall 430. And a flange portion 440 projecting radially outward from the portion. In the first embodiment, the flange portion 440 is formed over the entire circumference of the peripheral wall portion 430 in the circumferential direction.

  The bottom part 420 and the peripheral wall part 430 define a storage part 450 whose front surface is opened and whose rear surface is closed by the bottom part 420.

  As described above, in the first embodiment, the housing 50 in which the rotating body housing chamber 510 for housing the rotating body 20 is formed by the casing 30 and the separation plate 410.

  A cylindrical rib (rear shaft fixing portion: shaft support portion) 421 protruding forward is formed at the center of the bottom portion 420 of the storage portion 450 (the center of the back portion in the storage portion 450). The rear end of the shaft 60 that rotatably supports the rotating body 20 is inserted into the rib 421. This shaft 60 can be formed of, for example, ceramics.

  Note that the shaft 60 is held by the separation plate 410 so as not to rotate. In the first embodiment, as shown in FIG. 2, the contour of the rear end of the shaft 60 is D-shaped, and the inside of the cylindrical rib 421 corresponds to the rear end of the shaft 60. A D-shaped portion (not shown) is provided. The D-shaped rear end of the shaft 60 is fitted into the cylindrical rib 421, so that the shaft 60 is non-rotatably held by the separation plate 410.

  As the magnetic drive unit 460, for example, a stator having a stator core 461 formed of an electromagnetic steel sheet, a coil 462 wound around the stator core 461, and an insulating unit 463 that insulates the stator core 461 from the coil 462 can be used. . The magnetic drive unit 460 is provided on the outer periphery of the peripheral wall 430 so as to surround the peripheral wall 430.

  The control unit 470 is a control board that controls the magnetic drive unit 460, and is located behind the separation plate 410 and the magnetic drive unit 460. The control unit 470 is electrically connected to the coil 462 of the magnetic drive unit 460. When the control unit 470 energizes the coil 462 of the magnetic drive unit 460, a magnetic field is generated in the magnetic drive unit 460 to rotate a magnetic follower 80 of the rotating body 20, which will be described later.

  The mold resin 480 can be formed of, for example, an unsaturated polyester resin, and is located outside the separation plate 410, and integrally includes the separation plate 410, the magnetic driving unit 460, and the control unit 470. The mold resin 480 has a function of radiating heat generated in the magnetic drive unit 460 and the control unit 470 to the outside. Further, the mold resin 480 also has a function of protecting the magnetic drive unit 460 and the control unit 470.

  The rotating body 20 has an impeller 70 as a pump unit provided at a front part, and a magnetic driven part 80 provided at a rear part of the impeller 70. In the first embodiment, the impeller 70 and the magnetic follower 80 are connected via a neck (connector) 90 (see FIGS. 2 and 24). In the first embodiment, the impeller 70, the magnetic follower 80, and the neck (connection) 90 are integrally formed. That is, the impeller 70 is integrally provided at a front portion (one end side in the shaft 60 direction) of the magnetic driven portion 80.

  The magnetic follower 80 of the rotating body 20 is housed in the housing 450, and the impeller 70 is housed in the pump chamber 330. In the first embodiment, the pump chamber 330 is formed in a circular shape in a plan view to accommodate the impeller 70, and is formed on the outer periphery of the impeller accommodation chamber 340 to increase the pressure of the liquid. And a spiral-shaped volute 350 in a plan view.

  The magnetic driven unit 80 is a rotor housed in the housing unit 450 and rotatably supported by the shaft 60.

  The magnetic follower 80 includes a fixing member 810 made of synthetic resin, a magnet 820 fixed on the outer periphery of the fixing member 810, and a bearing 830 fixed on the inner periphery of the fixing member 810. . Note that the fixing member 810 can be formed using, for example, polyphenylene ether (PPE) resin. The magnet portion 820 can be formed using a permanent magnet made of ferrite or SmFe. The bearing 830 can be formed using a carbon-containing resin sliding material, ceramic, or the like.

  Further, in the first embodiment, as shown in FIG. 3, fixing member 810 is formed integrally with neck portion (connection portion) 90 and rear shroud (second shroud) 730.

  Further, the magnet part 820 is formed of a magnet main body 821 and a stainless steel magnet cover 822 covering the outer surface of the magnet main body 821. Note that the outer peripheral surface of the magnet unit main body 821 may be exposed on the outer periphery of the magnetic driven unit (rotor) 80 without providing the magnet cover 822.

  A through hole 831 is formed in the center of the bearing 830, and the rotating body 20 is rotatably supported by inserting the shaft 60 into the through hole 831.

  At this time, the magnetic follower (rotor) 80 is arranged such that the magnet 820 faces the magnetic drive 460 via the peripheral wall 430 of the separation plate 410. Note that a gap d1 for allowing rotation of the magnetic follower 80 is formed between the magnet 820 and the peripheral wall 430.

  A plurality of impellers 70 serving as pump units located in front of the magnetic driven unit 80 are provided at a plurality of intervals at substantially equal intervals in the circumferential direction of the impeller 70, and include impellers 710 that increase the pressure of liquid by rotational centrifugal force. Further, the impeller 70 has a front shroud (first shroud) 720 covering the front side (one axial side) of each blade part 710, and a rear shroud (first side shroud) covering the rear side (the other axial side) of each blade part 710. A second shroud) 730.

  In the first embodiment, front shroud 720 has front shroud body 721 whose diameter decreases toward the front, and rear end 722b is connected to the front end (inner circumferential end 723) of front shroud body 721. , And a cylindrical portion 722 formed to protrude forward.

  On the other hand, the rear shroud 730 is formed in a substantially disk shape, and a through hole 730a is formed in the center of the rear shroud 730. A fixing member 810 is connected to a peripheral edge of the through hole 730 a of the rear shroud 730, that is, an inner peripheral end 731 of the rear shroud 730 via a neck (connecting portion) 90. In the first embodiment, the front surface 733 of the rear shroud 730 (the inner surface on the second shroud side of the centrifugal flow channel 760 described later) 733 is a flat surface extending in the radial direction.

  Further, in the first embodiment, rear shroud 730 and magnetic follower 80 are formed by insert molding. That is, with the magnet portion 820 and the bearing 830 inserted into a mold (not shown), the mold is filled with resin to form the rear shroud 730, the neck (connecting portion) 90, and the fixing member 810. , The rear shroud 730 and the magnetic follower 80 are integrally formed.

  Each of the blade portions 710 has a substantially plate shape, and a rear surface (an inner surface on a first shroud side of a centrifugal flow channel 760 to be described later) 725 in a state where the plate thickness crosses the axial direction. Are provided integrally. Further, in the first embodiment, each blade 720 is formed in a gentle arc shape having a convex front side in the rotation direction.

  Each blade 710 is provided in a range from the inner peripheral end 723 of the front shroud main body 721 to the outer peripheral end 724 of the front shroud main body 721.

  On the other hand, the rear end of each blade portion 710 is attached to the front surface (the inner surface on the second shroud side of the centrifugal flow channel 760) 733 of the rear shroud 730, and each blade portion 710 is mounted on the inner peripheral side of the rear shroud 730. It is provided in a range from the end 731 to the outer end 732 of the rear shroud 730.

  In the first embodiment, the inner peripheral edge of the front shroud main body 721 (the inner peripheral end 722 of the front shroud main body 721) and the inner peripheral edge of the rear shroud 730 (the inner peripheral end 731 of the rear shroud 730). Are arranged at the same position in the radial direction of the impeller 70.

  That is, the front shroud main body 721 and the rear shroud 730 are, when viewed from the axial direction, the inner peripheral edge of the front shroud main body 721 (the inner peripheral end 722 of the front shroud main body 721) and the inner peripheral edge of the rear shroud 730. (The inner circumferential end 731 of the rear shroud 730).

  On the other hand, the outer peripheral edge of the front shroud main body 721 (the outer peripheral end 723 of the front shroud main body 721) and the outer peripheral edge of the rear shroud 730 (the outer peripheral end 732 of the rear shroud 730) also extend in the radial direction of the impeller 70. It is arranged at the same position.

  That is, the front shroud main body 721 and the rear shroud 730 are viewed from the axial direction, and the outer peripheral edge of the front shroud main body 721 (the outer peripheral end 723 of the front shroud main body 721) and the outer peripheral edge of the rear shroud 730 ( The rear shroud 730 is formed so as to substantially coincide with the outer peripheral end 732).

  A gap is formed between the inner peripheral end 722 of the front shroud main body 721 and the inner peripheral end 721 of the rear shroud 730, and the outer peripheral end 723 of the front shroud main body 721 and the rear shroud 723 are formed. A gap is also formed between outer peripheral end portions 732 of 730.

  As described above, in the first embodiment, between the front shroud main body 721 and the rear shroud 730, two blades 710, 710, the front shroud 720, and the rear shroud 730 adjacent to each other are defined. A plurality of spaces are formed in the circumferential direction and are open at the radially inner side and the radially outer side.

  Each of the plurality of spaces serves as a centrifugal channel 760 that forms part of the impeller channel 740 formed in the impeller 70. In each of the centrifugal channels 760, the radially inner opening is an inlet 761, and the radially outer opening is a discharge port 762.

  An introduction path 750 that forms part of the impeller flow path 740 is formed radially inside the centrifugal flow path 760.

  In the first embodiment, the introduction path 750 is formed so as to extend in the axial direction from the front end 722a side of the cylindrical portion 722 to the through hole 730a of the rear shroud 730, and the introduction port of each centrifugal flow path 760 is formed. Reference numeral 761 communicates with the introduction path 750.

  When the impeller 70 having such a configuration is rotated, the liquid introduced into the centrifugal flow path 760 from the introduction path 750 via the introduction port 761 is increased in pressure by the centrifugal force of the rotating impeller 70 and discharged. It is discharged radially outward from the outlet 762.

  Then, the liquid discharged from the discharge port 762 to the outer peripheral side of the impeller 70 is introduced into the volute section 350, and the pressure is increased in the volute section 350.

  The casing 30 is made of a synthetic resin, and can be formed of, for example, a polyphenylene sulfide (PPS) resin. Note that the casing 30 can be made of metal.

  As shown in FIG. 5, the casing 30 includes a top wall 310 and a peripheral wall 320 protruding rearward from a peripheral edge of the top wall 310, and is formed in a container shape that opens rearward. The pump chamber 330 described above is defined by the inner surface 311 of the top wall 310 and the inner surface 321 of the peripheral wall 320.

  Further, in the first embodiment, the peripheral wall 320 of the casing 30 is located outside the peripheral wall portion 430 of the separation plate 410, and the outer peripheral portion of the pump chamber 330 bulges radially outward from the storage portion 450. ing. The outer peripheral portion of the impeller 70 protruding radially outward from the magnetic driven portion 80 is disposed in the bulging portion. At this time, the impeller 70 is arranged such that the rear surface of the outer peripheral portion (the rear surface on the outer peripheral side of the rear shroud 720) faces the front surface of the inner peripheral portion of the flange portion 440.

  In the first embodiment, the rear surface of the peripheral wall 320 is brought into contact with the outer peripheral side of the front surface of the flange portion 440, so that the storage portion 450 and the pump chamber 330 of the casing 30 are communicated.

  The casing 30 is attached to the drive block 40 by attaching a peripheral wall 320 to an outer peripheral portion of the drive block 40 with a plurality of screws 130.

  Specifically, a screw is formed in a state where the through hole 322 formed in the peripheral wall 320, the through hole 442 b formed in the flange portion 440 of the separation plate 410, and the screw hole 481 formed in the mold resin 480 communicate with each other. By inserting 130 from the front side, casing 30 and drive block 40 are fixed.

  At this time, a sealing member 100 such as a packing is interposed at a joint portion between the casing 30 and the flange portion 440, so that the watertightness of the rotating body storage chamber 510 can be ensured.

  In the first embodiment, a step is formed in the flange portion 440, and the flange portion 440 includes an inner peripheral side flange portion 441, an outer peripheral side flange portion 442 located behind the inner peripheral side flange portion 441, Is provided. A groove 442a for accommodating the sealing material 100 is formed on the inner peripheral side (outside the step) of the outer peripheral side flange 442.

  Further, a pressing protrusion 323 that presses the sealing material 100 housed in the groove 442a is formed on the peripheral wall 320.

  Then, when the casing 30 is fixed to the drive block 40, the sealing material 100 housed in the groove 442 a is pressed by the pressing protrusion 323 formed on the peripheral wall 320.

  By doing so, the watertightness of the rotating body storage chamber 510 formed inside the housing 50 (inside the pump body 10) is ensured.

  Further, in the first embodiment, when the casing 30 is fixed to the drive block 40, the rear surface of the peripheral wall 320 is also in contact with the outer peripheral portion of the inner peripheral flange portion 441. That is, the outer peripheral edge of the pump chamber 330 is located inside the outer peripheral edge of the inner peripheral flange portion 441. The rear portion of the volute 350 is defined by the front surface 441a of the inner flange 441.

  A suction pipe 380 connected to a pipe (not shown) is formed at the center of the top wall 310 of the casing 30, and a suction pipe for introducing a liquid into the pump chamber 330 is provided inside the suction pipe 380. A passage 381 is formed. On the other hand, a discharge pipe 390 connected to a pipe or the like (not shown) is formed on the peripheral wall 320 of the casing 30. Inside the discharge pipe 390, the liquid in the pump chamber 330 is externally connected. ) Is formed.

  The suction pipe 380 is provided so as to protrude forward from the center of the top wall 310, and has a suction port at the end of the suction pipe 380 that opens forward and sucks a liquid into the suction passage 381. 381a are formed. The suction passage 381 communicates with a flow path such as a pipe connected to the suction pipe 380 via a suction port 381a formed on the upstream side.

  In the first embodiment, the suction passage 381 communicates with the introduction passage 750 of the impeller passage 740 in a state where the impeller 70 is disposed in the pump chamber 330.

  Specifically, a rear end 380a of the suction pipe 380 is projected into the pump chamber 330, and an outlet 381b that opens rearward is formed in the protruded rear end 380a. By inserting the outflow port 381b of the rear end 380a into the introduction path 750, the suction path 381 communicates with the introduction path 750. The outlet 381b of the suction path 381 also serves as an inlet of the introduction path 750.

  Further, in the first embodiment, an annular groove 312 is formed on the outer periphery of the rear end 380 a protruding into the pump chamber 330, and the front end 722 a of the cylindrical portion 722 is inserted into the groove 312. Thus, the rotation of the impeller 70 is guided.

  In the first embodiment, the suction path 381 and the introduction path 750 are both arranged to extend in the front-rear direction. Therefore, the liquid in the suction path 381 and the liquid in the introduction path 750 mainly flow from the front to the rear in the axial direction. That is, the suction passage 381 and the introduction passage 750 are upstream in the axial front and downstream in the axial rear.

  On the other hand, the discharge pipe 390 is protruded from the side of the peripheral wall 320 so as to extend outward. The discharge pipe 390 has a distal end that opens outward to allow liquid to flow from the discharge path 391 to the outside. A discharge port 391b for discharging is formed. The discharge path 391 communicates with a flow path such as a pipe connected to the discharge pipe 390 via a discharge path 391b formed on the downstream side.

  The discharge path 391 has an inlet 391a formed on the upstream side, and communicates with the end point 350b of the volute 350 through the inlet 391a. Note that the discharge port 391b is open in a direction intersecting with the axial direction (perpendicular direction in the first embodiment).

  In the first embodiment, the discharge path 391 is formed so as to extend in the tangential direction near the end point 350b of the volute 350 formed in a spiral shape. That is, the liquid in the discharge path 391 mainly flows in the tangential direction near the end point 350b of the volute section 350.

  As described above, by extending the discharge path 391 communicating with the end point 350b of the volute section 350 in the tangential direction near the end point 350b of the volute section 350, the vicinity of the end point 350b of the volute section 350 on the peripheral wall 320 of the casing 30 is provided. Then, a tongue 324 is formed. The tongue 324 branches the volute 350 and the discharge path 391, and a starting point 350 a of the volute 350 is formed between the tip of the tongue 324 and the outer periphery of the impeller 70.

  The casing 30 is provided with a front shaft fixing portion (shaft support portion) 370 located at the center of the rotating body storage chamber 510. The front end of the shaft 60 is provided at the rear of the front shaft fixing portion 370. Fixed.

  As described above, the shaft 60 is non-rotatably held by the separation plate 410, and the casing 30 and the separation plate 410 are fixed by the screws 130. Therefore, the relative rotation of the shaft 60 with respect to the casing 30 can be restricted without the casing 30 holding the front end of the shaft 60 so that it cannot rotate. Therefore, it is not necessary for the casing 30 to hold the front end of the shaft 60 so that it cannot rotate. However, the front end of the shaft 60 can be held by the casing 30 so as not to rotate.

  In the first embodiment, the front shaft fixing portion 370 is provided via a plurality of support ribs 373 extending toward the pump chamber 330 from a rear end 380 a located on the inner surface 311 side of the top wall 310 of the casing 30. It is formed integrally with the casing 30. The front shaft fixing portion 370 includes a cone-shaped protrusion 371 protruding toward the front, and a cylindrical bearing 372 connected to the rear of the protrusion 371 and supporting the front end of the shaft 60. Have been.

  Reference numeral 110 in FIG. 3 is a bearing plate that receives a thrust load applied to the bearing 830. The bearing plate 110 suppresses abrasion of a portion (the rear end of the cylindrical bearing portion 372) of the casing 30 facing the magnetic driven portion 80 when the magnetic driven portion 80 is rotated. is there. Reference numeral 120 in FIG. 23 is a cushioning material that absorbs vibration of the shaft 60 and the like.

  In the first embodiment, the cone-shaped protruding portion 371 is arranged in the introduction path 750 of the impeller channel 740 with the impeller 70 arranged in the pump chamber 330. At this time, the protruding portion 371 has a tapered front end facing the upstream side, and the flow path of the liquid introduced into the introduction path 750 is changed by the protruding portion 371. .

  As described above, the protrusion 371 has a function of changing the direction in which the liquid flows, and in the first embodiment, the protrusion 371 corresponds to a flow direction changing unit.

  By the way, in the first embodiment, the impeller channel 740 is formed so as to discharge the liquid flowing from the front in the axial direction outward in the radial direction.

  That is, the direction (axial direction) in which the liquid mainly flows when introduced into the introduction path 750 and the direction (radial direction) in which the liquid mainly flows when discharged from the discharge port 762 of the centrifugal flow path 760 intersect. ing.

  Therefore, in the first embodiment, the protrusion 371 as the flow direction changing unit is arranged in the introduction path 750, and the flow direction of the liquid flowing in the axial direction is changed by the protrusion 371 so as to be closer to the radial direction. Like that. This makes it possible to more smoothly introduce the liquid into the centrifugal channel 760 from the inlet 761.

  The drive of the pump 1 having such a configuration is performed by energizing the coil 462 by the control unit 470. When a current flows through the coil 462, a magnetic field is generated in the magnetic drive unit 460. Then, the magnet part 820 of the rotating body 20 is attracted and repelled to the magnetic driving part 460, and the magnetic driven part 80 rotates around the shaft 60 in the direction of arrow a in FIG. As a result, the impeller 70 rotates about the axis 60 extending in the front-back direction.

  Then, when the impeller 70 rotates, the liquid introduced into the impeller channel 750 from the suction port 381b via the suction path 381 is discharged from the discharge port 762 to the outer peripheral side of the impeller 70. Then, the liquid discharged to the outer peripheral side of the impeller 70 is basically introduced into the volute section 350 and the pressure is increased in the volute section 350. Thereafter, the liquid is introduced into the discharge path 391 in a state where the pressure is increased in the volute section 350, and is discharged to the outside of the pump 1 through the discharge port 391b.

  As described above, the pump flow path F extending from the suction port 381a to the discharge port 391b is formed inside the pump body 10, and the liquid sucked into the pump body 10 from the suction port 381a passes through the pump flow path F It flows through the inside and is discharged from the discharge port 391b.

  In the first embodiment, the pump flow path F includes the above-described suction path 381, impeller flow path 750 (introduction path 750 and centrifugal flow path 760), volute section 350, and discharge path 391.

  Here, in the first embodiment, it is possible to more reliably suppress a decrease in pump efficiency.

  Specifically, by providing a liquid separation suppressing structure for preventing the liquid flowing in the pump flow path F from being separated in the pump flow path F, it is more sure that the pump efficiency is reduced. So that it can be suppressed.

  Hereinafter, a specific structure of the liquid separation suppressing structure provided in the pump flow path F will be described.

  First, the liquid separation suppressing structure provided in the volute section 350 will be described.

  As described above, the volute portion 350 is formed around the impeller 70 on the outer peripheral side of the impeller 70 in a state where the impeller 70 is disposed in the pump chamber 330.

  Then, the liquid discharged from the discharge port 762 formed radially outside the impeller flow path 740 (radially outside the centrifugal flow path 760) is introduced into the volute section 350. That is, an opening 356 that faces the discharge port 762 formed radially outside the impeller channel 740 is formed inside the volute portion 350 in the radial direction. In the first embodiment, the opening 356 is formed in a range from the start point 350a of the volute section 350 to the end point 350b (the entire volute section 350).

  The axially rear side of the volute portion 350 is defined by the front surface 441 a of the inner peripheral flange portion 441 of the separation plate 410. In the first embodiment, the front surface 441a of the inner peripheral side flange portion 441 is a flat surface extending in the radial direction.

  The outer peripheral side (radially outer side) of the volute portion 350 is defined by the inner surface 321 of the peripheral wall 320, and the front side in the axial direction is defined by the inner surface 311 of the top wall 310.

  As described above, in the first embodiment, the space that opens radially inward forms the volute 350.

  Then, the liquid introduced into the volute section 350 flows in the circumferential direction from the start point 350a to the end point 350b, and is introduced into the discharge path 391 from the end point 350b via the inlet 391a.

  In the first embodiment, the volute section 350 is configured such that the width (radial length) gradually increases from the upstream side to the downstream side (from the start point 350a to the end point 350b). . That is, the volute section 350 is formed such that the cross-sectional area of the flow path gradually increases from the upstream side to the downstream side.

  With this configuration, the liquid flowing in the volute section 350 is introduced into the discharge path 391 in a state where the pressure is increased in the volute section 350.

  Here, in the first embodiment, the inclined surface 358 is formed on the inner surface 357 of the volute portion 350 such that the axial length of the volute portion 350 becomes longer from the edge 357 a on the opening 356 side toward the radial outside. Is formed.

  Specifically, as shown in FIG. 10, as the contour line 351 of the radial cross section (the cross section along the radial direction and the axial direction) of the volute portion 350 moves from the radial inner end 352a to the radial outer end 352b. It has a straight portion 352 as an inclined side that is inclined to be on the front side. The straight portion 352 is a radial cross-section line of the inclined surface 358. Therefore, in the first embodiment, the inclined surface 358 is formed such that the radial cross section of the volute portion 350 is straight.

  In the first embodiment, the contour 351 of the radial cross section of the volute 350 is constituted by a straight line 352, a curved line 353, a vertical line 354, and a horizontal line 355.

  Here, the vertical line portion 354 is a straight line located radially outward and extending in the axial direction from the front end 354a to the rear end 354b.

  The curved line 353 is an arc line that smoothly connects the radially outer end 352b of the linear portion 352 and the front end 354a of the vertical line portion 354. As a method of smoothly connecting the radially outer end 352b of the linear portion 352 and the front end 354a of the vertical line portion 354 with an arc, for example, the tangent of the arc at the radially outer end 352b becomes the linear portion 352. The tangent of the circular arc line at the front end 354a may be a vertical line portion 354.

  In the first embodiment, the straight portion 352, the curved line 353, and the vertical line portion 354 are formed on the front surface and the diameter of the volute 350 among the inner surfaces 311 and 321 that define the pump chamber 330 formed in the casing 30. It is a radial cross-section line of a surface that defines the outside in the direction. On the other hand, the horizontal line 355 is a radial cross-section line of the front surface 441a of the inner peripheral side flange portion 441 that defines the axially rear side of the volute portion 350.

  As described above, in the first embodiment, the shape of the volute portion 350 is, in a radial cross-sectional view, a shape in which a substantially fan-shaped cross-sectional shape that expands smoothly forward toward the radial direction outward is formed on the front side in the axial direction. I am trying to become.

  In the first embodiment, the inclined surface 358 has a function as a liquid separation suppressing structure.

  Specifically, the angle (elevation angle) of the inclined surface 358 with the horizontal direction is set to about 20 ° so that the liquid introduced into the volute section 350 from the opening 356 flows smoothly on the inclined surface 358.

  If the angle (elevation angle) of the inclined surface 358 with the horizontal direction is too large, the liquid introduced into the volute 350 from the opening 356 may be separated without flowing on the inclined surface 358.

  Therefore, it is preferable to set the angle (elevation angle) between the inclined surface 358 and the horizontal direction to be 45 ° or less.

  As shown in FIGS. 6 to 8, the inclined surface 358 is formed so that the length in the radial direction increases from the upstream side to the downstream side.

  At this time, the radial length of the inclined surface 358 at each point is set so that the flow path cross-sectional area of the volute section 350 increases substantially linearly from the start point 350a to the end point 350b as shown in FIG. Is preferred. In FIG. 9, a1 and S1 are the volute units 350 shown on the left side of FIG. 8, a2 and S2 are the volute units 350 shown on the left side of FIG. 7, and a3 and S3 are the volute units 350 shown on the right side of FIG. a4 and S4 correspond to the volute unit 350 shown on the right side of FIG.

  In the first embodiment, the outer diameter of the impeller 70 is about 40 mm, and the height (axial length) of the discharge port 762 of the impeller 70 is about 3.5 mm.

  On the other hand, the diameter of the volute section 350 from the center of the impeller 70 (the center of the shaft 60) has a minimum diameter (diameter at the start point 350a) of about 45 mm and a maximum diameter (diameter at the end point 350b) of about 58 mm.

  In addition, the minimum height (length in the axial direction) of the volute portion 350 is set to about 5.25 mm. In the first embodiment, the height of the opening 356 formed on the inner side in the radial direction of the volute portion 350 is the minimum height.

  As described above, in the first embodiment, the height of the opening 356 of the volute section 350 is larger than the height of the discharge port 762 of the impeller 70. The impeller 70 is arranged in the pump chamber 330 such that the entirety from the front end to the rear end of the discharge port 762 faces the opening 356. By doing so, the liquid discharged from the discharge port 762 can be more efficiently introduced into the volute section 350.

  In the first embodiment, the radially outer end 352b of the linear portion 352 and the front end 354a of the vertical line portion 354 are smoothly connected by a curved line 353. By doing so, it is possible to suppress the liquid from peeling off or staying at the radially outer front portion of the volute portion 350.

  Further, in the first embodiment, a rectifying section 360 is provided between the impeller channel 740 and the volute section 350.

  The rectifying section 360 is formed between the centrifugal flow path 760 and the volute section 350, and is provided for rectifying the liquid discharged from the discharge port 762 of the centrifugal flow path 760 and then introducing the liquid into the volute section 350. The rectifying section 360 also forms a part of the pump flow path F.

  In the first embodiment, the rectifying section 360 extends substantially horizontally from the radially inner side to the radially outer side, and communicates with the volute section 350 on the radially outer side. That is, the rectifying section 360 is formed such that the radial cross section is a straight line extending in the radial direction.

  Specifically, the rectifying section 360 is defined at the front by a horizontal plane 361 extending horizontally inward in the radial direction from the radial inner edge (radial inner end 352a) of the volute section 350. In the first embodiment, the horizontal surface 361 is formed on the inner surface 311 of the ceiling wall 310 and is formed so as to be continuous with the inclined surface 358.

  On the other hand, the rear of the rectifying portion 360 is defined by the front surface 441a of the inner peripheral side flange portion 441 extending horizontally. Therefore, rectifying section 360 is formed so as to be continuous with inner surface 357 of volute section 350 also on the rear side.

  As described above, in the first embodiment, the rectifying section 360 is formed outside the radial direction of the discharge port 762 and along the liquid discharge direction (radial direction). The rectifying section 360 has a substantially constant height (length in the axial direction) and is formed so as to be continuous with the volute section 350.

  The rectifying section 360 has a function as a liquid separation suppressing structure. In the first embodiment, the length (radial length) of the rectifying section 360 is set to about 1.5 mm.

  Next, a liquid separation suppressing structure provided in the discharge path 391 will be described.

  In the first embodiment, the discharge path 391 is formed such that the contour shape of the flow path cross section of the discharge path 391 gradually becomes a perfect circle from the end point 350b side of the volute 350 toward the discharge port 391b. .

  Specifically, in the discharge path 391, on the introduction port 391a side, since the introduction port 391a communicates with the end point 350b of the volute section 350, the contour shape of the flow path cross section is substantially trapezoidal. On the other hand, since the discharge port 391b is connected to a pipe or the like, it is preferable that the discharge port 391b has a circular shape, which is the contour of a general pipe flow path.

  At this time, if the contour shape of the cross section of the flow path is suddenly changed in the middle of the discharge path 391, the resistance generated in the liquid flowing in the discharge path 391 increases.

  Therefore, in the first embodiment, as shown in FIG. 14 to FIG. 21, the contour shape of the cross section of the discharge path 391 gradually becomes a perfect circle from the end point 350b side of the volute 350 toward the discharge port 391b. Thus, the liquid was allowed to flow more smoothly in the discharge path 391.

  By doing so, the discharge path 391 has a function as a liquid separation suppressing structure.

  Further, in the first embodiment, as shown in FIG. 22, the flow path cross-sectional area of the discharge path 391 linearly increases from the end point 350b side of the volute 350 to the discharge port 391b. Here, E to L in FIG. 22 correspond to the respective cross-sectional lines (each cross-sectional line obtained by cutting the discharge path 391 at equal intervals) shown in FIG. 13, and SE to SL are cut at the respective cross-sectional lines. 9 shows a flow path cross-sectional area of the discharge path 391.

  In addition, the shape of the above-mentioned discharge path 391 sets one or more reference lines from the inlet 391a to the outlet 391b, and sets the reference line at each point from the inlet 391a to the outlet 391b. It can be obtained by setting a contour shape such that the cross-sectional area increases as it approaches a perfect circle while passing.

In the first embodiment, the cross-sectional area of the flow path at the end point 350b of the volute section 350 is about 50 mm ² , the diameter of the discharge port 391b is about 14.5 mm, and the cross-sectional area of the flow path of the discharge port 391b is about 165 mm ^{It is 2} .

  The length of the line segment from the end point 350b of the volute section 350 to the discharge port 391b is about 50 mm.

  Next, the liquid separation suppressing structure provided on the cone-shaped protrusion 371 as the flow direction changing part will be described.

  As described above, the impeller channel 740 mainly flows in the direction (axial direction) in which the liquid flows when introduced into the introduction channel 750, and the liquid mainly flows in the centrifugal channel 760 from the introduction channel 750. Direction (direction inclined more in the radial direction than the axial direction, substantially radial direction) intersects.

  Therefore, a protruding portion 371 as a flow direction changing portion is arranged in the introduction path 750, and the flow direction of the liquid flowing in the axial direction is changed by the protruding portion 371 so as to be closer to the radial direction.

  Here, in the first embodiment, the surface 371a of the protruding portion (flow direction changing portion) 371 is formed in a concave shape concave inward in the radial direction. That is, the surface 371a of the protruding portion (flow direction changing portion) 371 is formed to be a circular arc line 371b that is convex toward the center in a radial cross-sectional view.

  Further, in the first embodiment, the virtual extension line (virtual arc line) C <b> 1 of the arc line 371 b projects so as to contact the front surface (the inner surface of the centrifugal flow channel 760 on the second shroud side) 733 of the rear shroud 730. The section (flow direction changing section) 371 is arranged in the introduction path 740.

  Specifically, the front surface (the inner surface on the second shroud side of the centrifugal flow channel 760) 733 of the rear shroud 730 is a flat surface extending in the radial direction. A contact point T1 is formed between the inner peripheral edge of the flat surface (the inner peripheral end 731 of the rear shroud 730) and the outer peripheral edge (the outer peripheral end 732 of the rear shroud 730). Like that.

  Incidentally, the protruding portion (flow direction changing portion) 371 is provided so that the liquid can be more smoothly introduced into the centrifugal channel 760 from the inlet 761. Therefore, it is preferable that the contact point T1 is formed at a position near the inner peripheral end 731. Further, as shown in FIG. 23, in the protruding portion (flow direction changing portion) 371, the outer peripheral edge of the surface 371 a is larger than the front surface of the rear shroud 730 (the inner surface of the centrifugal flow channel 760 on the second shroud side) 733. It is preferable to arrange it so that it may be located ahead in the axial direction.

  By doing so, the surface 371a of the protruding portion (flow direction changing portion) 371 has a function as a liquid separation suppressing structure.

  In the first embodiment, the height from the front surface (the inner surface on the second shroud side of the centrifugal flow channel 760) 733 of the rear shroud 730 to the tip of the protruding portion (flow direction changing portion) 371 is about 8 0.5 mm. Further, the maximum outer diameter of the protruding portion (flow direction changing portion) 371 is set to about 14.8 mm. The radius of curvature of the arc wire 371b is set to about 7.4 mm.

  Next, the liquid separation suppressing structure provided in the centrifugal channel 760 will be described.

  As described above, the impeller flow path 740 has a direction in which the liquid mainly flows when introduced into the introduction path 750 (axial direction), and a direction in which the liquid mainly flows when the liquid is discharged from the discharge port 762 of the centrifugal flow path 760. (Radial direction) and intersect.

  That is, the liquid introduced into impeller flow path 740 flows while changing the flowing direction from the axial direction to the radial direction.

  Therefore, in the first embodiment, the rear surface (the inner surface on the first shroud side of the centrifugal flow path 760) 725 is located on the rear shroud (second shroud) 730 side in a radial cross-sectional view in the first embodiment. It was formed so as to have a convex contour line 726.

  Specifically, as shown in FIG. 26, the contour line 726 has a shape in which the first arc line 727 on the upstream side and the second arc line 728 on the downstream side are smoothly connected.

  Then, when the liquid is introduced into the contour line 726 in the axial direction (introduction into the introduction path 750), the tangent direction at the start end (the end edge of the centrifugal flow path 760 on the introduction port 761 side) 727a of the first arc line 727 is changed. (Mainly the flowing direction).

  Further, when the contour line 726 is discharged from the discharge port 762 of the centrifugal flow channel 760 at the end of the second circular arc line 728 (the end edge of the centrifugal flow channel 760 on the discharge port 762 side) 728b in the tangential direction. Direction in which the liquid mainly flows).

  The first arc line 727 and the second arc line 728 are such that the tangent at the end 727b of the first arc 727 and the tangent at the start end 728a of the second arc 728 are a common tangent. Is connected smoothly.

  This makes it possible to more smoothly change the flow direction of the liquid introduced into the impeller flow path 740 from the axial direction to the radial direction.

  That is, the rear surface (the inner surface on the first shroud side of the centrifugal flow channel 760) 725 of the front shroud main body 721 has a function as a liquid separation suppressing structure.

  In the first embodiment, the inside diameter of the front shroud body 721 is about 19 mm, and the outside diameter of the outside shroud is about 40 mm. The radius of curvature of the first arc line 727 is 2.0 mm, and the radius of curvature of the second arc line 728 is 25 mm.

  The outline 726 of the rear surface (the inner surface on the first shroud side of the centrifugal flow channel 760) 725 of the front shroud main body 721 is not limited to a shape in which two arc lines are smoothly connected. For example, the shape shown in FIG. 28 can be used. In FIG. 28, the contour of the rear surface (the inner surface on the first shroud side of the centrifugal flow path 760) 725 of the front shroud main body 721 is formed by one arc line. The radius of curvature of this arc line can be, for example, 25 mm.

  Further, a straight line portion may exist in the middle of the contour line 726. In this case, it is preferable that a region surrounded by the contour line 726 and a straight line connecting both ends of the contour line 726 be a convex set.

  In the first embodiment, the flow path cross-sectional area of the centrifugal flow path 760 linearly increases from the inlet 761 side of the centrifugal flow path 760 to the discharge port 762.

  By doing so, the centrifugal flow channel 760 has a function as a liquid separation suppressing structure.

  In the first embodiment, the height on the inner diameter side (the length of the radial inner end 711 in the axial direction) of each blade 710 is set to about 5.8 mm, and the height on the outer side (radial outer end The axial length of the portion 712) is about 3.5 mm. Further, each blade 710 has a plate thickness of about 1.2 mm. Further, each blade portion 710 has an inner diameter side blade angle (an angle formed between the tangent line of the inner peripheral side end portion 731 of the rear shroud 730 at the tip 711a of the radially inner end portion 711 and the blade portion 710) to about 35 °. Are arranged as follows. In addition, each blade portion 710 has an outer-diameter-side blade angle (an angle formed by a tangent to the outer-side end portion 731 of the rear-side shroud 730 at the tip 712a of the radially outer end portion 712 and the blade portion 710) at about 35 °. Are arranged as follows.

  Next, the liquid separation suppressing structure provided on the blade portion 710 will be described.

  In the first embodiment, each blade 710 is formed such that the tip 711a of the radially inner end 711 is tapered.

  By sharpening the tip 711a of the radially inner end 711 in this manner, the liquid flowing toward the tip 711a of the radially inner end 711 is more smoothly branched to both sides of the blade 710. Will be able to

  By doing so, each blade portion 710 has a function as a liquid separation suppressing structure.

  In the first embodiment, the radius of curvature of the tip 711a of the radially inner end 711 of each blade 710 is set to 0.1 mm or less.

  In the first embodiment, each blade 710 is formed such that the tip 712a of the radially outer end 712 is also tapered.

  As described above, the pump 1 according to the first embodiment includes the suction path 381 formed with the suction port 381a for sucking the liquid and the discharge path formed with the discharge port 391b for discharging the sucked liquid. 391 and a pump body 10 having the same. Further, the pump 1 includes an impeller 70 housed in a pump chamber 330 formed in the pump body 10, and a shaft 60 that rotatably supports the impeller 70.

  Further, a pump flow path F extending from the suction port 381a to the discharge port 391b is formed in the pump body 10.

  The pump passage F is formed in the suction passage 381 and the impeller 70, and an impeller passage 740 into which the liquid in the suction passage 381 is introduced. There is provided a volute section 350 into which the liquid in 740 is introduced, and a discharge path 391 into which the liquid in the volute section 350 is introduced.

  In the pump flow path F, there is provided a liquid separation suppressing structure for preventing the liquid flowing in the pump flow path F from being separated.

  Thus, the liquid flowing in the pump flow path F can be prevented from peeling or staying, and the pump efficiency can be more reliably prevented from lowering. become.

  Further, an opening 356 is formed on the radially inner side of the volute section 350 so as to face the discharge port 762 formed on the radially outer side of the impeller channel 740. An inclined surface 358 is formed on the inner surface 357 of the volute 350 so that the axial length of the volute 350 increases from the edge 357a on the opening 356 side toward the outside in the radial direction. The liquid separation suppressing structure includes the inclined surface 358.

  Thus, the liquid introduced into the volute section 350 can flow along the inclined surface 358, and the liquid can be more smoothly introduced into the volute section 350. As a result, it is possible to suppress the liquid flowing in the volute section 350 from peeling or staying.

  Further, the inclined surface 358 is formed such that the radial cross section of the volute portion 350 is straight.

  As a result, the axial length of the volute portion 350 linearly increases radially outward from the edge 357a on the opening 356 side. As a result, the liquid in the impeller flow path 740 can be more smoothly introduced into the volute section 350, and the liquid can be more reliably prevented from peeling or staying. become.

  Further, the pump flow path F includes a rectifying section 360 formed between the impeller flow path 740 and the volute section 350, and the liquid separation suppressing structure includes the rectifying section 360.

  As a result, the liquid discharged from the impeller flow path 740 is rectified by the rectifying unit 360 and then introduced into the volute unit 350, so that the liquid is separated or stays. It is possible to more reliably suppress it.

  The rectifying section 360 is formed such that the radial cross section is a straight line extending in the radial direction.

  Thus, the liquid discharged from the impeller channel 360 can be rectified in the radial direction, which is the direction of introduction to the volute section 350.

  Further, the discharge path 391 is formed such that the contour shape of the flow path cross section of the discharge path 391 gradually becomes a perfect circle from the end point 350b side of the volute portion 350 toward the discharge port 391b, thereby suppressing liquid separation. The structure includes this discharge path 391.

  Accordingly, it is possible to suppress the liquid flowing in the discharge path 391 from peeling or staying.

  The cross-sectional area of the discharge passage 391 increases linearly from the end point 350b of the volute 350 to the discharge port 391b.

  This allows the liquid in the discharge path 391 to flow more smoothly toward the discharge port 391b, so that the liquid can be more reliably prevented from peeling or staying. Become.

  The impeller 70 includes a plurality of blade portions 710 that increase the pressure of the liquid by the rotational centrifugal force, a front shroud (first shroud) 720 that covers the front side (one axial side) of the blade portions 710, and a blade portion 710. And a rear shroud (second shroud) 730 that covers the rear side (the other axial side).

  The impeller channel 740 is defined by two blade portions 710, 710 adjacent to each other, a front shroud (first shroud) 720, and a rear shroud (second shroud) 730, and has a radially inner inlet. A centrifugal flow channel 760 having a discharge port 762 formed radially outwardly is provided with a centrifugal flow path 760. Further, the impeller flow path 740 is formed radially inside the centrifugal flow path 760, and introduces liquid from the suction path 381 and introduces the introduced liquid from the inlet 761 into the centrifugal flow path 760. 750.

  Here, the introduction path 750 has an upstream side on the front side (front shroud 720 side) and a downstream side on the rear side (rear shroud 730 side), and the centrifugal flow path 760 is in front of the rear shroud 730 (centrifugal flow path). The second shroud-side inner surface 760 of the second embodiment 760 is a surface extending in the radial direction.

  The direction in which the liquid mainly flows when introduced into the introduction path 750 (axial direction), and the direction in which the liquid mainly flows when introduced into the centrifugal flow path 760 from the introduction path 750 (in the radial direction rather than the axial direction). (Inclining direction, substantially radial direction).

  Further, in the introduction path 750, a protruding portion (flow direction changing portion) 371 that is formed so as to have a tapered tip and changes the flow of the liquid is disposed with the tip directed to the upstream side. The surface 371a of the (flow direction changing portion) 371 is formed so as to be a circular arc line 371b that is convex toward the center in a radial cross-sectional view.

  The protruding portion (flow direction changing portion) 371 is arranged so that the virtual extension line C1 of the arc line 371b contacts the front surface 733 of the rear shroud 730 (the inner surface of the centrifugal flow channel 760 on the second shroud side) 733. And the liquid separation suppressing structure includes a surface 371 a of the protruding portion (flow direction changing portion) 371.

  Thus, the flow direction of the liquid introduced from the suction path 381 into the introduction path 750 can be changed more smoothly, and the liquid in the introduction path 750 can be easily introduced into the centrifugal flow path 760. As a result, it is possible to prevent the liquid flowing in the impeller flow path 740 from peeling or staying.

  The impeller 70 includes a plurality of blade portions 710 that increase the pressure of the liquid by the rotational centrifugal force, a front shroud (first shroud) 720 that covers the front side (one axial side) of the blade portions 710, and a blade portion 710. And a rear shroud (second shroud) 730 that covers the rear side (the other axial side).

  The impeller channel 740 is defined by two blade portions 710, 710 adjacent to each other, a front shroud (first shroud) 720, and a rear shroud (second shroud) 730, and has a radially inner inlet. A centrifugal flow channel 760 having a discharge port 762 formed radially outwardly is provided with a centrifugal flow path 760. Further, the impeller flow path 740 is formed radially inside the centrifugal flow path 760, and introduces the liquid from the suction path 381 and introduces the introduced liquid from the introduction port 761 into the centrifugal flow path 760. 750.

  Here, the introduction path 750 has an upstream side on the front side (front shroud 720 side) and a downstream side on the rear side (rear shroud 730 side), and the direction in which the liquid mainly flows when introduced into the introduction path 750. (Axial direction) and a direction (radial direction) in which the liquid mainly flows when the liquid is discharged from the discharge port 762 of the centrifugal flow channel 760 intersects.

  Also, the rear surface (the inner surface on the first shroud side of the centrifugal channel 760) 725 of the front shroud main body 721 has a contour line 726 protruding toward the rear shroud (second shroud) 730 in a radial cross-sectional view. Is formed.

  The contour line 726 indicates that the direction of the tangent line at the start end (the end edge of the centrifugal flow channel 760 on the inlet 761 side) 727a of the first arc line 727 is the axial direction (when the liquid is introduced into the introduction passage 750). Mainly flowing direction).

  Further, when the contour line 726 is discharged from the discharge port 762 of the centrifugal flow channel 760, the tangential direction at the end (the edge on the discharge port 762 side of the centrifugal flow channel 760) 728b of the second arc line 728 is radial. Direction in which the liquid mainly flows).

  The liquid separation suppressing structure includes a rear surface (an inner surface on the first shroud side of the centrifugal flow channel 760) 725 of the front shroud main body 721.

  Accordingly, the flow direction of the liquid flowing in the centrifugal flow channel 760 can be changed more smoothly, and the liquid flowing in the centrifugal flow channel 760 is prevented from peeling or staying. Will be able to

  The impeller 70 includes a plurality of blade portions 710 that increase the pressure of the liquid by the rotational centrifugal force, a front shroud (first shroud) 720 that covers the front side (one axial side) of the blade portions 710, and a blade portion 710. And a rear shroud (second shroud) 730 that covers the rear side (the other axial side).

  Here, impeller channel 740 is defined by two blade portions 710, 710 adjacent to each other, front shroud (first shroud) 720, and rear shroud (second shroud) 730, and is introduced radially inward. An outlet 761 is formed, and a centrifugal channel 760 having a discharge port 762 formed radially outward is provided.

  The cross-sectional area of the centrifugal channel 760 linearly increases from the inlet 761 side of the centrifugal channel 760 to the discharge port 762, and the liquid separation suppressing structure includes the centrifugal channel 760.

  Accordingly, the liquid in the centrifugal flow channel 760 can flow more smoothly, and the liquid flowing in the centrifugal flow channel 760 can be prevented from peeling or staying. Become like

  Further, the impeller 70 is provided so as to extend from the radially inner side to the outer side, and includes a plurality of blade portions 710 that increase the pressure of the liquid by rotational centrifugal force.

  The blade portion 710 is formed such that a tip 711a of a radially inner end portion 711 (a radially inner end portion) is tapered, and the liquid separation suppressing structure includes the blade portion 710.

  Accordingly, it is possible to prevent the liquid introduced from the introduction path 750 into the centrifugal flow path 760 from interfering with the tip 711 a of the radially inner end 711 (the radially inner end) of the blade 710. Thus, the liquid can be more smoothly introduced into the centrifugal flow path 760.

(Embodiment 2)
The pump 1A according to the second embodiment has basically the same configuration as the pump 1 shown in the first embodiment, as shown in FIGS.

  That is, the pump 1A includes the pump body 10 having a suction path 381 formed with a suction port 381a for sucking a liquid and a discharge path 391 formed with a discharge port 391b for discharging the sucked liquid. . Further, the pump 1A includes an impeller 70 housed in a pump chamber 330 formed in the pump main body 10, and a shaft 60 that rotatably supports the impeller 70.

  Further, a pump flow path F extending from the suction port 381a to the discharge port 391b is formed in the pump body 10.

  The pump passage F is formed in the suction passage 381 and the impeller 70, and an impeller passage 740 into which the liquid in the suction passage 381 is introduced. There is provided a volute section 350 into which the liquid in 740 is introduced, and a discharge path 391 into which the liquid in the volute section 350 is introduced.

  In the pump flow path F, there is provided a liquid separation suppressing structure for preventing the liquid flowing in the pump flow path F from being separated.

  Here, the pump 1A according to the second embodiment is mainly different from the pump 1 of the first embodiment in that a rectifying section 360 is not formed between the impeller flow path 740 and the volute section 350. is there.

  That is, the liquid discharged from the discharge port 762 to the outer peripheral side of the impeller 70 is directly introduced into the volute section 350, and the pressure is increased in the volute section 350.

  It should be noted that the pump 1A has a liquid separation suppressing structure other than the rectifying section described in the first embodiment.

  With the pump 1A having such a configuration, the same operation and effect as those of the first embodiment can be obtained.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications are possible.

  For example, in each of the above-described embodiments, an example in which a plurality of liquid separation suppressing structures are provided has been described, but it is sufficient that at least one of these liquid separation suppressing structures is provided. That is, it is possible to provide a pump having only a part of the plurality of liquid separation suppressing structures.

  In addition, the specifications (shape, size, layout, etc.) of the casing, the drive block, and other details can be appropriately changed.

  As described above, the pump according to the present invention can suppress liquid separation and stagnation, and can increase the pump efficiency. Therefore, the pump according to the present invention is also applicable to applications such as a pump for a water heater and a heat pump. it can.

1, 1A pump 10 pump body 330 pump chamber 350 volute section 350a start point 350b end point 356 opening 357 inner surface 357a end edge 358 inclined surface 360 rectifying portion 371 projecting portion (flow direction changing portion)
371a Surface 371b Arc wire 381 Suction path 381a Suction port 391 Discharge path 391b Discharge port 60 Shaft 70 Impeller 710 Blade section 711 Radial inner end 711a Tip 720 Front shroud (first shroud)
721 Front shroud main body 725 Rear surface (inner surface on the first shroud side of the centrifugal flow path)
726 Contour line 727 First arc line 727a Beginning end (edge on the inlet side of centrifugal channel)
728 Second arcuate wire 728b End (edge on the discharge port side of centrifugal flow path)
730 rear shroud (second shroud)
733 Front surface (inner surface on the second shroud side of the centrifugal flow path)
740 Impeller channel 750 Introducing channel 760 Centrifugal channel 761 Inlet 762 Discharge port C1 Virtual extension line F Pump channel

Claims (8)

A pump body having a suction path formed with a suction port for sucking the liquid, and a discharge path formed with a discharge port for discharging the sucked liquid;
An impeller housed in a pump chamber formed in the pump body;
A shaft rotatably supporting the impeller,
With
In the pump body, a pump flow path from the suction port to the discharge port is formed,
The pump passage is formed in the suction passage, the impeller, and an impeller passage through which liquid in the suction passage is introduced, and is formed radially outside the impeller, and the pump passage is formed in the impeller passage. A volute section to which liquid is introduced, and the discharge path to which liquid in the volute section is introduced,
In the pump flow path, a liquid separation suppression structure that suppresses separation of the liquid flowing in the pump flow path is provided,
On the radially inner side of the volute portion, an opening facing a discharge port formed on the radially outer side of the impeller channel is formed,
On the inner surface of the volute portion, an inclined surface is formed that is inclined so that the axial length of the volute portion becomes longer toward the outside in the radial direction from the edge on the opening side,
The inclined surface is formed such that a radial cross section of the volute portion is straight,
The pump flow path includes a rectifying section formed between the impeller flow path and the volute section,
The rectifying portion extends radially inward from a radially inner end of the inclined surface, and is formed so that a radial cross-section is a straight line that extends without a step over the entire radial length.
The discharge path is formed such that the contour shape of the flow path cross section of the discharge path gradually becomes a perfect circle from the end point side of the volute portion toward the discharge port,
The pump, wherein the liquid separation suppressing structure includes the inclined surface, the rectifying section, and the discharge path . The inclined surface is formed such that the length of the volute portion in the radial direction increases from the upstream side to the downstream side of the volute portion,
The pump according to claim 1, wherein a cross-sectional area of the flow path of the volute section linearly increases from a start point to an end point of the volute section.   The pump according to claim 1, wherein an elevation angle, which is an angle between the inclined surface and a radial direction of the volute portion, is 20 °. The pump according to any one of claims 1 to 3, wherein a flow path cross-sectional area of the discharge path linearly increases from an end point side of the volute portion to the discharge port. The impeller includes a plurality of blades for increasing the pressure of the liquid by rotational centrifugal force, a first shroud covering one axial side of the blade, and a second shroud covering the other axial side of the blade. And
The impeller flow path is defined by two blades adjacent to each other, the first shroud and the second shroud, and an inlet is formed radially inward and a discharge outlet is formed radially outward. A formed centrifugal flow path, an introduction path formed radially inside the centrifugal flow path, for introducing liquid from the suction path, and introducing the introduced liquid from the introduction port into the centrifugal flow path. And
In the introduction path, the first shroud side is an upstream side, and the second shroud side is a downstream side,
The centrifugal flow path, the inner surface of the second shroud side is a surface extending in the radial direction,
The direction in which the liquid mainly flows when introduced into the introduction path, and the direction in which the liquid mainly flows when introduced into the centrifugal flow path from the introduction path, intersect,
In the introduction path, the tip is formed so that the tip is tapered, the flow direction changing unit that changes the flow of the liquid is disposed with the tip facing the upstream side,
The surface of the flow direction changing section is formed so as to be a circular arc convex toward the center side in a radial cross-sectional view,
The flow direction changing unit is disposed in the introduction path such that a virtual extension line of the arc line is in contact with an inner surface of the centrifugal flow path on the second shroud side,
The pump according to any one of claims 1 to 4 , wherein the liquid separation suppressing structure further includes a surface of the flow direction changing unit. The impeller includes a plurality of blades for increasing the pressure of the liquid by rotational centrifugal force, a first shroud covering one axial side of the blade, and a second shroud covering the other axial side of the blade. And
The impeller channel is defined by two blades adjacent to each other, the first shroud and the second shroud, and an inlet is formed radially inward and a discharge outlet is formed radially outward. A formed centrifugal flow path, an introduction path formed radially inside the centrifugal flow path, for introducing liquid from the suction path, and introducing the introduced liquid from the introduction port into the centrifugal flow path. And
In the introduction path, the first shroud side is an upstream side, and the second shroud side is a downstream side,
The direction in which the liquid mainly flows when the liquid is introduced into the introduction path, and the direction in which the liquid mainly flows when the liquid is discharged from the discharge port of the centrifugal flow path, intersect,
An inner surface of the centrifugal flow passage on the first shroud side is formed so as to have a contour that is convex on the second shroud side in a radial cross-sectional view,
The outline is such that the direction of the tangent line at the inlet-side edge of the centrifugal flow path is the direction in which the liquid mainly flows when introduced into the introduction path, and the end of the centrifugal flow path at the discharge port side. The direction of the tangent line at the edge is the direction in which the liquid mainly flows when discharged from the discharge port of the centrifugal flow path,
The pump according to any one of claims 1 to 5 , wherein the liquid separation suppressing structure further includes an inner surface of the centrifugal flow passage on the first shroud side. The impeller includes a plurality of blades for increasing the pressure of the liquid by rotational centrifugal force, a first shroud covering one axial side of the blade, and a second shroud covering the other axial side of the blade. And
The impeller channel is defined by two blades adjacent to each other, the first shroud and the second shroud, and an inlet is formed radially inward and a discharge outlet is formed radially outward. Comprising a formed centrifugal channel,
The cross-sectional area of the centrifugal flow path increases linearly from the inlet side to the discharge port of the centrifugal flow path,
The pump according to any one of claims 1 to 6 , wherein the liquid separation suppressing structure further includes the centrifugal flow path. The impeller is provided so as to extend from the radially inner side to the outer side, and includes a plurality of blade portions that increase the pressure of the liquid by rotational centrifugal force,
The wing portion is formed so that the radially inner end portion is tapered,
The pump according to any one of claims 1 to 7 , wherein the liquid separation suppressing structure further includes the blade portion.

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