JP2015028314A - Guide vane and pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide vane and a pump device capable of having high pump efficiency.SOLUTION: A guide vane 40 for guiding a fluid boosted by an impeller 20 of a pump device 1 to an impeller 20 in the next stage, is equipped with a disc-shaped installing plate 41; a plurality of vanes 42 provided on one main surface 41a of the installing plate 41, and gradually decreasing intervals between the vanes adjacent to each other from an outer peripheral side to a center side of the installing plate 41; and sub vanes 46 provided between the vanes 42.

Description

  The present invention relates to a guide vane for guiding fluid and a pump device having the guide vane.

  2. Description of the Related Art As a pump device that supplies a liquid, a device that drives a multistage pump in which a plurality of impellers and a casing are stacked with a motor is known. Such a pump device has a high demand for high head and high efficiency. For this reason, a guide vane that guides fluid from the discharge port on the outer peripheral side of the impeller to the suction port on the center side of the next stage impeller is provided in the casing, and the fluid is gradually increased by passing the impeller and the guide vane. A pump device for pressurization is known (see, for example, Patent Document 1).

JP 2009-221987

  The pump device described above has the following problems. That is, the pump device can have a high head by increasing the number of impellers. However, increasing the number of impellers increases the size of the pump and motor, increases the manufacturing cost, and increases the drive shaft. There is a possibility that problems such as an increase in noise due to an increase in length may occur. Further, by increasing the number of impellers, there is a possibility that the reduction in pump efficiency may be reduced even if the head is high. For this reason, the pump device is required to further improve the pump efficiency.

  Accordingly, an object of the present invention is to provide a pump guide vane and a pump device that can improve pump efficiency.

  In order to solve the above problems and achieve the object, the guide vane and the pump device of the present invention are configured as follows.

  A guide vane according to an aspect of the present invention is a guide vane for guiding a fluid pressure increased by an impeller to the next impeller, and includes a disk-shaped mounting plate and a plurality of vanes provided on one main surface of the mounting plate. And a sub vane provided between the adjacent vanes.

  A pump device according to an aspect of the present invention includes a motor, a rotating shaft that is rotated by the motor, a plurality of impellers that increase pressure by rotating with the rotation of the rotating shaft, and a pump casing that houses the impeller. And a guide vane including a disk-shaped mounting plate, a plurality of vanes provided on one main surface of the mounting plate, and a sub vane provided between the adjacent vanes.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the guide vane and pump apparatus of a pump which can improve pump efficiency.

Sectional drawing which shows the structure of the pump apparatus which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the principal part structure of the pump apparatus. The top view which shows the principal part structure of the pump apparatus. Sectional drawing which shows the structure of the pump apparatus which concerns on the 2nd Embodiment of this invention. Sectional drawing which shows the principal part structure of the pump apparatus. The top view which shows the principal part structure of the pump apparatus.

(First embodiment)
Hereinafter, a pump device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a cross-sectional view showing a part of the configuration of the pump device 1 according to the first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing the configuration of the pump 5 of the pump device 1, and FIG. 4 is a plan view showing a configuration of a guide vane 40 of the pump 5. FIG. In addition, F in FIG. 1 shows the flow of water.

  As shown in FIG. 1, the pump device 1 is, for example, a vertical multistage pump, and water or the like is used as a working fluid. Such a pump device 1 is connected to the motor 2, the first connecting member 3 connected to the motor 2, the second connecting member 4 connected to the first connecting member 3, and the second connecting member 4. And a rotary shaft 6 connected to the motor 2 via a first connecting member 3 and a second connecting member 4.

  The motor 2 includes a stator, a rotor, and a motor shaft 2a that can transmit the rotational force of the rotor to the outside. For example, a DC motor is used as the motor 2.

  The first connecting member 3 includes a cylindrical bearing case 11, a first joint 12 provided in the bearing case 11, and a plurality of (three in FIG. 1) bearings 13 that pivotally support the first joint 12. And a fixture 14 that rotatably supports the bearing 13 on the bearing case 11.

  The first joint 12 is formed in a cylindrical body having two different outer diameters, and is housed in the bearing case 11 so that the large diameter portion is disposed on the motor 2 side and the small diameter portion is disposed on the pump 5 side. Yes. The first joint 12 is fixed to the motor shaft 2a on the large-diameter portion side, and is formed to be rotatable with the rotation of the motor shaft 2a. The 1st coupling 12 has the transmission part 15 which can transmit the rotation to the 2nd coupling 16 of the 2nd connection member 4 mentioned later which is a drive body on the small diameter part side. In addition, the transmission part 15 is formed in the substantially same diameter as the motor shaft 2a, and is provided in the end surface by the side of the small diameter part of the transmission part 15. FIG.

  The second connecting member 4 includes a second joint 16 and a joint case 17 that houses the second joint 16 therein.

  The second joint 16 has a pair of semi-cylindrical members 16a, and is formed so as to be assembled in a cylindrical shape by integrally joining the pair of semi-cylindrical members 16a with bolts or the like. Moreover, the 2nd coupling 16 is formed so that the transmission part 15 and the rotating shaft 6 can be fixed by assembling the semi-cylindrical member 16a in a cylindrical shape.

  The transmission part 15 is fixed by the second joint 16 by, for example, providing a key in the transmission part 15, providing a key groove in one of the second joints 16, and fixing with the key. As a method for fixing the rotary shaft 6 by the second joint 16, for example, holes are provided in the other side of the second joint 16 and the rotary shaft 6, and pins are fitted into these holes and fixed. Note that these fixing methods may be other methods and can be set as appropriate.

  The joint case 17 is formed so as to be fixed to the motor 2 by a bolt B via the bearing case 11. The joint case 17 constitutes a part of the outer member of the pump 5 by closing the upper end side of the discharge flow path portion 64 of the pump 5 described later. The joint case 17 has an insertion hole 18 through which the rotary shaft 6 is inserted. Further, the joint case 17 is provided with a mechanical seal 19 between the insertion hole 18 and the rotary shaft 6 to seal the gap between the insertion hole 18 and the rotary shaft 6.

  The pump 5 is provided integrally with the rotating shaft 6, the plurality of impellers 20 fixed to the rotating shaft 6, the impeller 20, the plurality of pump casings 30 stacked on each other, and the pump casing 30. A guide vane 40, a liner ring 50 provided between the impeller 20 and the pump casing 30, and a bearing member 51 provided between the rotary shaft 6 and the pump casing 30 are provided.

  The pump 5 is connected to the lowermost pump casing 30, covers the outer periphery of the flow path cover 60 that forms the suction port portion 61 and the discharge port portion 62, and the plurality of pump casings 30, and from the uppermost stage of the pump casing 30. And a cylindrical discharge flow path portion 64 that forms a flow path to the discharge port portion 62.

  The flow path cover 60, the discharge flow path portion 64, and the joint case 17 constitute an outer member of the pump 5. The suction port portion 61 of the flow channel cover 60 forms a flow channel to the pump casing 30, and the discharge port portion 62 forms a continuous flow channel via the uppermost pump casing 30 and the discharge flow channel portion 64. To do.

  The impeller 20 is made of, for example, stainless steel or resin. The impeller 20 includes a pair of shrouds 21 and 22 and a plurality of blades 23 provided between the pair of shrouds 21 and 22. The impeller 20 includes a discharge port 24 provided on the outer peripheral side of the shrouds 21 and 22 and the blades 23, and a suction port 25 provided on the center side of one shroud 21 (downward in FIG. 1). .

  The pump casing 30 is made of, for example, stainless steel and has a bowl shape having a bottom portion 30a. The pump casing 30 is formed with an engaging portion 32 provided with a seal groove 31 on its upper surface, and an engaged portion 33 that engages with the engaging portion 32 at the outer peripheral end of the bottom portion 30a.

  The pump casing 30 is stacked on each other when the engaging portion 32 and the engaged portion 33 are engaged with each other via a packing S such as an O-ring. The bottom portion 30a has an opening 35 through which the rotation shaft 6 and a part of the shroud 21 of the impeller 20 are inserted at the center thereof, an annular fitting groove 36 provided in the opening 35 and provided with a liner ring 50, It has.

  The guide vane 40 is provided on the bottom 30a of the pump casing 30, and is housed together with the impeller 20 in the pump casing 30 facing the bottom 30a. That is, the guide vane 40 is disposed in the lower (front) pump casing 30 of the pump casing 30 to be fixed, and is positioned between the impeller 20 and the next stage impeller 20. The guide vane 40 forms a flow path that guides the fluid pumped from the impeller 20 to the suction port 25 of the next stage impeller 20.

  The guide vane 40 includes a mounting plate 41, a plurality of vanes 42, and a plurality of sub vanes 46. The mounting plate 41 is formed in a disk shape. The mounting plate 41 includes, on the center side, an insertion hole 43 through which the rotary shaft 6 is inserted, and an annular fitting groove 44 provided in the insertion hole 43 and provided with a part of the bearing member 51. . The mounting plate 41 is formed to be inclined from the outer peripheral side toward the central side so that the thickness gradually increases from the outer peripheral side toward the central side.

  As shown in FIG. 3, the vane 42 is formed on the main surface 41 a of the mounting plate 41 in an arc shape from the outer peripheral side of the mounting plate 41 to the center side in a top view, and the gap between the adjacent vanes 42 is It arrange | positions at equal intervals on the attachment board 41 so that it may become narrow gradually from the outer peripheral side of the attachment board 41 toward the center side.

  A plurality of sub vanes 46 are provided on the mounting plate 41, and one or a plurality of sub vanes 46 are provided between adjacent vanes 42. Specifically, as shown in FIG. 3, the sub vane 46 is a straight line (hereinafter referred to as “connecting line”) that is on the outer peripheral side of the mounting plate 41 in the top view and passes through the end portion of the adjacent mounting plate 41. ) It is formed on the main surface 41a of the mounting plate 41 in an arc shape parallel to the vane 42 from the top to the center. In addition, as for the subvane 46, one edge part should just be the center side of the attachment board 41 rather than the connection line D or the connection line D. FIG.

  Further, the auxiliary vane 46 has a predetermined distance, for example, a distance between the vanes 42 adjacent to the auxiliary vane 46, that is, a distance M between the inner diameter side surface and the outer diameter side surface of the vane 42 facing the side surface. It arrange | positions between the vanes 42 so that it may space apart 1/4 or more of L.

  In addition, when moving between the adjacent vanes 42, the flow on the vane 42 side, which is the flow path between the vanes 42 and the inner diameter side is located in the flow path, is increased. In other words, the flow rate is different between the vanes 42.

  For this reason, the auxiliary vane 46 is preferably arranged at a position where the flow is relatively large, and the distance M between the side surfaces on the outer diameter side of the adjacent vanes 42 is 1/4 or more with respect to the distance L between the vanes 42. If so, the flow rate becomes a large position. The arrangement distance M can be set as appropriate depending on the shape of the guide vane 40 and the number of blades of the vane 42 and the sub vane 46.

  Such a guide vane 40 forms a plurality of flow paths of water pumped from the impeller 20 by the lower surface of the pump casing 30, the mounting plate 41 and the adjacent vanes 42. The guide vane 40 is configured to remove water that enters the guide vane 40 from an inlet of a flow path formed on the outer peripheral side of the lower surface of the pump casing 30, the mounting plate 41, and the adjacent vane 42. It is formed so that rectification is possible.

  Further, the guide vane 40 allows the fluid pressure-fed by the impeller 20 in the lower pump casing 30 to pass through the flow path formed between the mounting plate 41 and the vane 42, and the impeller of the next pump casing 30. 20 can be guided.

  The liner ring 50 is disposed in the fitting groove 36, and an annular liner ring main body 53 formed of resin, a CAC copper alloy, or the like, and a cover 54 that is press-fitted into the fitting groove 36 and covers the liner ring main body 53. And.

  The liner ring main body 53 has an outer diameter that is substantially the same as the inner peripheral surface of the cover 54 when the cover 54 is press-fitted into the fitting groove 36, and has a predetermined minute diameter with the outer peripheral surface of the impeller 20 on the suction port 25 side. It has an inner circumference that forms a gap.

  The cover 54 has, for example, a cross-sectional shape that is L-shaped with a circular arc on the side surface. Further, the outer diameter of the cover 54 is formed to be slightly larger than the inner diameter of the fitting groove 36. The cover 54 is fitted into the fitting groove 36, thereby preventing the liner ring main body 53 from being detached from the fitting groove 36.

  The bearing member 51 includes a sleeve 55, a bearing portion (bearing) 56, and a retaining ring 57. The sleeve 55 is formed into a cylindrical shape by, for example, SiC-based ceramic. The sleeve 55 is fixed by being fitted to the rotary shaft 6.

  The inner diameter of the sleeve 55 is substantially the same as the outer diameter of the rotating shaft 6 so that the inner diameter can be fitted to the rotating shaft 6. The sleeve 55 has an outer diameter smaller than the inner diameter of the through hole 37.

  The bearing portion 56 is formed in a cylindrical shape whose inner diameter is smaller than the inner diameter of the insertion hole 43 by, for example, SiC-based ceramic, and an inner peripheral surface thereof is formed so as to be in sliding contact with the sleeve 55. The bearing portion 56 has an inner peripheral diameter that can contact the outer peripheral surface of the sleeve 55 and that can slide. The bearing portion 56 is formed so that the rotary shaft 6 can be supported by the sleeve 55 being formed so that the inner peripheral surface of the bearing portion 56 can be smoothly rotated.

  In other words, the bearing portion 56 has a gap (a dimensional tolerance) between the sleeve 55 and the bearing portion 56 that can slide when the sleeve 55 rotates, and can prevent the shaft from sticking. It is formed in a predetermined gap that does not occur. The bearing portion 56 is engaged with the fitting groove 44. The bearing portion 56 is provided with a preventing means for preventing the rotation with the rotating shaft 6.

  The retaining ring 57 is formed of, for example, the same material stainless steel so that the thermal expansion coefficient (thermal expansion coefficient) is substantially the same as that of the pump casing 30, and the cross section thereof is formed in a square ring shape. The retaining ring 57 is fitted into the fitting groove 44 using a method such as interference fit so as to cover the bearing portion 56.

  In the pump device 1 configured as described above, when the motor shaft 2 a is rotated by the motor 2, the rotating shaft 6 is rotated (driven) from the motor shaft 2 a via the first connecting member 3 and the second connecting member 4. As the rotating shaft 6 rotates, the impeller 20 fixed to the rotating shaft 6 also rotates following the rotation.

  When the impeller 20 rotates, water is sucked from the suction port 25 of the impeller 20, and the sucked water is pressurized by the blades 23 of the impeller 20 and discharged from the discharge port 24 of the impeller 20 into the pump casing 30. Is done.

  The water discharged into the pump casing 30 moves to a guide vane 40 located in the pump casing 30, and the guide vane 40 causes the water to be discharged into the suction port 25 of the impeller 20 accommodated in the pump casing 30 of the next stage. You will be guided.

  More specifically, water moves along a plurality of flow paths formed by the main surface 41a of the guide vane 40 and the plurality of vanes 42. Since the width between the vane 42 and the sub vane 46 gradually narrows from the outer peripheral side of the main surface 41a toward the center side, the flow channel area gradually decreases. Due to the shape of the flow path, the water that has moved to the flow path moves to the suction port 25 of the impeller 20 while being rectified as the flow velocity increases.

  Further, the auxiliary vane 46 is disposed at a predetermined distance from the side surface on the outer diameter side of the vane 42 adjacent to the inner diameter side at a position where the flow between the vanes 42 is large. It becomes possible to move and guide the rectified water to the next stage (secondary side) impeller 20. Thereby, in the impeller 20, it is possible to increase the pressure of water whose flow is stable and rectify the water disturbed by the increased pressure by the guide vane 40.

  According to the pump device 1 configured as described above, the rectification of water is achieved by providing the mounting plate 41 of the guide vane 40 with one or a plurality of sub vanes 46 between the adjacent vanes 42. It becomes possible.

  In addition, the auxiliary vane 46 is an inflow port formed between the vanes 42 by providing at least the end of the adjacent vane 42 on the extension of the continuous line D from the outer peripheral edge of the mounting plate 41 to the inner side. The opening area is not reduced. That is, the sub vane 46 is disposed on the center side of the inlet of the mounting plate 41. For this reason, it becomes possible to prevent the auxiliary vane 46 from having a flow resistance at the inlet formed between the vanes 42 as much as possible.

  Further, the auxiliary vane 46 is disposed at a position where the water flow between the vanes 42 is relatively large by disposing the auxiliary vane 46 away from the outer diameter side surface of the vane 42 facing the inner diameter side surface by a predetermined distance or more. Therefore, it becomes possible to rectify more effectively.

  Further, the guide vane 40 may have a configuration in which the auxiliary vane 46 is provided at a predetermined position between the vanes 42, and does not increase the manufacturing cost.

  As described above, according to the pump device 1 according to the present embodiment, the auxiliary vane 46 is provided between the vanes 42 and closer to the center side than the inlet of the guide vane 40, By disposing the vane 42 away from the opposing vane 42 by a predetermined distance or more, the vane 42 has a high rectification function and does not increase the channel resistance. For this reason, the guide vane 40 can improve the pump efficiency.

(Second Embodiment)
Next, a pump device 1A according to a second embodiment of the present invention will be described with reference to FIGS.
4 is an external view showing a configuration of a pump device 1A according to the second embodiment of the present invention in a partial cross section, FIG. 5 is an enlarged cross-sectional view showing the configuration of a pump 5A of the pump device 1A, and FIG. It is a top view showing composition of guide vane 40A of pump 5A. In addition, F in FIG.4 and FIG.5 shows the flow of water. Note that in the pump device 1A according to the second embodiment, the same components as those of the pump device 1 according to the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the pump device 1A is, for example, a horizontal multi-stage pump, and water or the like is used as the fluid used. 1 A of such pump apparatuses are provided with the motor 2, the pump 5A connected to this motor 2, and the rotating shaft 6 connected to the motor 2 via the connection member 3A.

  The pump 5A includes a rotating shaft 6 fixed to the motor shaft 2a of the motor 2, a plurality of impellers 20 fixed to the rotating shaft 6, and a plurality of pump casings 30 that house the impeller 20 and are stacked on each other. The guide vane 40A provided integrally with the pump casing 30 and the liner ring 50 provided between the impeller 20 and the pump casing 30 are provided.

  The pump 5 </ b> A is connected to the pump casing 30 to form a suction port portion 61 and a discharge port portion 62, and a flow path cover that forms a flow path from the suction port portion 61 to the discharge port portion 62 via the pump casing 30. 60A is provided. In the pump 5A, the flow path cover 60A constitutes an outer member of the pump 5A.

  The guide vane 40 </ b> A is provided in the pump casing 30 and is housed in the pump casing 30 together with the impeller 20. The guide vane 40 </ b> A is disposed in the pump casing 30 and is positioned between the impeller 20 and the next stage impeller 20. The guide vane 40 </ b> A forms a flow path that guides the fluid pumped from the impeller 20 to the suction port 25 of the next stage impeller 20.

  The guide vane 40 </ b> A includes a mounting plate 41, a plurality of vanes 42, a plurality of sub vanes 46, and a guide vane 47. The mounting plate 41 is formed in a disk shape. The mounting plate 41 includes, on the center side, an insertion hole 43 through which the rotary shaft 6 is inserted, and an annular fitting groove 44 provided in the insertion hole 43 and provided with a part of the bearing member 51. . The mounting plate 41 is formed to be inclined from the outer peripheral side toward the central side so that the thickness gradually increases from the outer peripheral side toward the central side.

  The mounting plate 41 is provided with vanes 42 on one main surface 41a and the other main surface 41b. Further, the mounting plate 41 is formed so that its outer diameter is the same as the inner diameter of the inner peripheral surface 30a of the pump casing 30 indicated by a two-dot chain line in FIG. , 41b can be formed.

  The guide vane 47 is formed on the other main surface 41 b of the mounting plate 41. As shown by a broken line in FIG. 6, the guide vane 47 is formed in an arc shape from the center side of the mounting plate 41 toward the outer peripheral edge in a top view. The guide vane 47 is disposed to face the outer peripheral edge of the impeller 20 and is formed so as to be able to rectify the fluid discharged from the impeller 20.

  Such a guide vane 40 </ b> A forms a plurality of flow paths of water pumped from the impeller 20 by the lower surface of the pump casing 30, the mounting plate 41, adjacent guide vanes 47, and the adjacent vanes 42 and sub vanes 46. The guide vane 40 </ b> A is formed so that the water discharged from the impeller 20 can be rectified to the notch of the mounting plate 41 by one main surface of the pump casing 30, the mounting plate 41 and the adjacent guide vane 47. Further, the guide vane 40A is formed so that the water entering from the notch of the mounting plate 41 can be rectified by the vane 42 and the sub vane 46 by the other main surface of the pump casing 30, the mounting plate 41 and the adjacent vanes 42 and 46. Has been.

  In addition, the guide vane 40A allows the fluid pressure-fed by the impeller 20 in the lower pump casing 30 to pass through the flow path formed between the mounting plate 41 and the vane 42, and the impeller of the next-stage pump casing 30. 20 can be guided.

  According to the pump device 1A configured as described above, the water discharged from the impeller 20 can be rectified by the guide vane 40A, similarly to the pump device 1 described above.

  As described above, according to the pump device 1 according to the present embodiment, the auxiliary vane 46 is provided between the vanes 42 and closer to the center than the inlet of the guide vane 40A, By disposing the vane 42 away from the opposing vane 42 by a predetermined distance or more, it is possible to have a high rectification function and improve pump efficiency.

  The present invention is not limited to the above embodiment. For example, in the above-described example, an example in which a single sub vane 46 is used between the vanes 42 has been described. However, as described above, two or more sub vanes 46 may be provided between the vanes 42.

  In the above-described example, the guide vane 40 is provided in the lower stage of the pump casing 30. However, for example, the pump casing 30 and the guide vane 40 may be integrated. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 2 ... Motor, 2a ... Motor shaft, 3 ... Connection member, 4 ... Connection member, 5 ... Pump, 6 ... Rotary shaft, 11 ... Bearing case, 12 ... Joint, 13 ... Bearing, 14 ... Fixing tool , 15 ... transmission part, 16 ... joint, 16a ... semi-cylindrical member, 17 ... joint case, 18 ... insertion hole, 19 ... mechanical seal, 20 ... impeller, 21 and 22 ... a pair of shrouds, 23 ... blades, 24 ... discharge Outlet, 25 ... Suction port, 30 ... Pump casing, 30a ... Bottom, 31 ... Seal groove, 32 ... Engagement part, 33 ... Engaged part, 35 ... Opening part, 36 ... Fitting groove, 37 ... Through hole, 40 ... guide vane, 41 ... mounting plate, 41a ... main surface, 42 ... vane, 42a ... side surface, 43 ... insertion hole, 44 ... fitting groove, 45 ... ridge, 46 ... sub vane, 50 ... liner ring, 51 ... Bearing member, 53 ... Liner ring body, 54 ... Chromatography, 55 ... sleeve, 56 ... bearing portion, 57 ... retaining ring, 60 ... channel cover, 61 ... inlet, 62 ... discharge port, 64 ... discharge flow path section, B ... bolt, S ... packing.

Claims (10)

In the guide vane that guides the fluid pressure increased by the impeller to the next impeller,
A disc-shaped mounting plate;
A plurality of vanes provided on one main surface of the mounting plate;
A secondary vane provided between the adjacent vanes;
A guide vane characterized by comprising: The vane extends in an arc shape from the outer peripheral side of the mounting plate toward the center side,
The guide vane according to claim 1, wherein the sub vane extends in an arc shape from the outer peripheral side of the mounting plate toward the center side in parallel with the vane.   3. The guide vane according to claim 2, wherein the sub vane is disposed closer to the center side than an end portion on the outer peripheral side of the adjacent vanes.   The secondary vane is characterized in that a side surface on the inner diameter side and a side surface on the outer diameter side of the vane facing the inner diameter side surface are spaced apart from each other by a predetermined distance or more. The guide vane according to claim 2 or claim 3.   The guide vane according to claim 1, further comprising a guide vane on the other main surface of the mounting plate. A motor,
A rotating shaft rotated by the motor;
A plurality of impellers that increase the pressure of the fluid by rotating with rotation of the rotating shaft;
A pump casing for storing the impeller;
A disk-shaped mounting plate, a plurality of vanes provided on one main surface of the mounting plate, and a guide vane including sub vanes provided between the adjacent vanes;
A pump device comprising: The vane extends in an arc shape from the outer peripheral side of the mounting plate toward the center side,
The pump device according to claim 6, wherein the sub vane extends in an arc shape from the outer peripheral side of the mounting plate toward the center side in parallel with the vane.   The said sub vane is arrange | positioned in the said center side rather than the edge part of the said outer peripheral side of the said adjacent vane, The pump apparatus of Claim 6 characterized by the above-mentioned.   The secondary vane is characterized in that a side surface on the inner diameter side and a side surface on the outer diameter side of the vane facing the inner diameter side surface are spaced apart from each other by a predetermined distance or more. The pump device according to claim 6 or 7.   The pump device according to claim 6, further comprising a guide vane on the other main surface of the mounting plate.

Images