JP2014194189A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump which can be adapted to a variety of pump performance and is low in cost.SOLUTION: A pump 1 comprises: a casing 30 in which a suction passage 35a and a discharge passage 36a are formed; a pump chamber 131 formed at the casing 30; an impeller 70 accommodated in the pump chamber 131; and a shaft 60 for rotatably supporting the impeller 70. Furthermore, a volute part 130 which is formed separately from the casing 30 is arranged at the casing 30 side of the pump chamber 131, and an opening 135 is formed inside the radial direction of the volute part 130. A shaft support part 133 for supporting a shaft 60 is formed at the volute part 130. By this constitution, the volute part 130 in which the shaft support part 133 is integrally formed can be constituted of a material which is more inexpensive than the casing 30 while making the casing 30 common in use.

Description

  The present invention relates to a pump that boosts and discharges sucked liquid.

  Conventionally, as a pump, a casing having a suction port, a volute integrally formed on the inner surface of the casing, a shaft support portion formed separately from the volute and fixed to the peripheral edge of the suction port, and a shaft There is known a shaft including a shaft that is supported at one end by a support portion and an impeller that is rotatably supported by the shaft via a rotor (for example, see Patent Document 1).

  In Patent Document 1, the shaft support portion and the casing are formed separately, so that the diameter of the suction port can be arbitrarily set while sharing the shaft support portion according to the pump performance. ing.

International Publication No. 08/069124

  However, in the conventional configuration, the shaft support part can be shared according to various pump performances, but the volute part that greatly affects the pump performance is formed integrally with the casing. When forming a volute part according to pump performance, it was necessary to make it a separate casing, respectively.

  In recent years, demands for heat resistance and high water pressure resistance have been increasing for pumps, and therefore it is necessary to use expensive resin materials such as engineering plastics for the casing. There was a problem of becoming.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a low-cost pump that can cope with various pump performances.

  In order to solve the conventional problems, a pump according to the present invention includes a casing in which a suction channel and a discharge channel are formed, a pump chamber formed in the casing, and a blade accommodated in the pump chamber. A pump and a shaft that rotatably supports the impeller, and a volute portion formed separately from the casing is provided on a casing side of the pump chamber, and radially inward of the volute portion Is formed with an opening communicating with the suction flow path, and a shaft support portion for supporting the shaft is formed in the volute portion.

  As a result, a casing made of an expensive resin material having high heat resistance, high rigidity, and high hardness can be shared according to various pump performances, while the volute part on which the shaft support part is formed is used as the casing. By forming it separately, the volute part can be made of a material cheaper than the casing.

  Furthermore, the volute part according to pump performance can be formed, and it can be arbitrarily exchanged with respect to a casing.

  ADVANTAGE OF THE INVENTION According to this invention, the low cost pump which can respond to various pump performance can be provided.

It is a front sectional view of a pump concerning Embodiment 1 of the present invention. It is a top view which shows the casing of the pump concerning Embodiment 1 of this invention. It is the perspective view which looked at the casing of the pump concerning Embodiment 1 of this invention from the inner side. It is a figure which shows the volute part of the pump concerning Embodiment 1 of this invention, Comprising: (a) is the perspective view which looked at the volute part from the casing side, (b) is the perspective view which looked at the volute from the pump chamber side. FIG. It is a figure which shows the spacer of the pump concerning Embodiment 1 of this invention, Comprising: (a) is the perspective view which looked at the spacer from the casing side, (b) is the perspective view which looked at the spacer from the separating plate side. is there. It is the perspective view which looked at the casing of the pump concerning the modification of Embodiment 1 of this invention from the inner side. It is the perspective view which looked at the volute part concerning the modification of Embodiment 1 of this invention from the casing side.

  A first invention is a casing in which a suction channel and a discharge channel are formed, a pump chamber formed in the casing, an impeller accommodated in the pump chamber, and the impeller can be rotated. A pump having a shaft that supports the volute portion formed separately from the casing on the casing side of the pump chamber, and communicated with the suction passage on a radially inner side of the volute portion. An opening portion is formed, and a shaft support portion for supporting the shaft is formed in the volute portion.

  As a result, a casing made of an expensive resin material having high heat resistance, high rigidity, and high hardness can be shared according to various pump performances, while the volute part on which the shaft support part is formed is used as the casing. By forming it separately, the volute part can be made of a material cheaper than the casing. Furthermore, the volute part according to pump performance can be formed, and it can be arbitrarily exchanged with respect to a casing.

  Therefore, it is possible to provide a low-cost pump that can cope with various pump performances.

  In the second invention, in particular, the suction flow of the suction channel and the discharge port of the discharge channel in the pump of the first invention are arranged in a direction intersecting the axial direction, and the suction flow The path has a curved shape so that the downstream side is substantially parallel to the axial direction, and an annular protrusion that projects around the opening is formed on the casing side of the volute. The upper surface of the projection is formed in a flat shape.

  As a result, the upper surface of the projection formed in a planar shape can be made a part of the suction flow path, and the sharp bend in the suction flow path can be eliminated, so that the liquid in the suction flow path can be eliminated. The flow becomes smooth and the pump efficiency can be increased.

  According to a third aspect of the invention, in particular, the protrusion in the pump of the second aspect of the invention is such that the suction port side of the upper surface formed in a planar shape is exposed to the suction flow path, and the side opposite to the suction port side is blocked by the casing. It is comprised so that.

  As a result, by making the suction port side a part of the suction channel on the upper surface of the projection formed in a planar shape, it is possible to eliminate sharp bends in the suction channel, and the flow of liquid in the suction channel As a result, the pump efficiency can be increased.

  Furthermore, the portion closed by the casing on the side opposite to the suction port side can be positioned in the axial direction when the volute portion on which the shaft support portion is formed is attached to the casing, improving the assembly accuracy and assembling. Can be improved.

  In the fourth invention, in particular, an elastic material is disposed between the volute portion and the casing of the pump according to any one of the first to third inventions.

  Thereby, since the variation in the dimension in the axial direction is absorbed by the elastic material, the shaft support portion can be attached without rattling.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the following description, the rotational axis direction of the impeller is defined as the front-rear direction, and the suction port side in the rotational axis direction is defined as the front side.

(Embodiment 1)
FIG. 1 is a front sectional view of a pump according to a first embodiment of the present invention.

  The pump 1 shown in FIG. 1 includes a pump main body 10 that forms an outer shell, and a rotary body 20 that is stored in a rotary body storage chamber 51 formed in the pump main body 10.

  The pump body 10 includes a casing 30, a pump chamber 131 that opens to the rear, a volute 130 that is formed separately from the casing 30, and a drive block 40 that has a storage portion 41 a that opens to the front. It is roughly composed. As will be described later, the spacer 140 is also a member constituting the pump body 10 as necessary.

  The drive block 40 is located behind the casing 30 and the volute unit 130. A storage unit 41a (described later) of the drive block 40 communicates with the pump chamber 131 of the volute unit 130, and the storage unit 41a and the pump chamber 131 constitute a rotary body storage chamber 51 that stores the entire rotary body 20.

  The drive block 40 includes a separation plate 41, a magnetic drive unit 42, a control unit 43, and a mold resin 44 that forms an outline.

  The separation plate 41 is made of a synthetic resin, and can be formed of, for example, a polyphenylene sulfide (PPS) resin. It is also possible to form the separation plate using a metal that does not affect the magnetic drive.

  The separation plate 41 is formed in a container shape that opens to the front, and includes a bottomed cylindrical storage portion 41a whose front surface is open and whose rear surface is closed by a bottom portion 41b, and a front wall portion 41c of the storage portion 41a. And a flange portion 41d projecting radially outward from the edge portion. In the present embodiment, the flange portion 41d is formed over the entire circumferential length of the peripheral wall portion 41c.

  Thus, in the present embodiment, the casing 50, the volute unit 130, and the separation plate 41 constitute the housing 50 in which the rotating body storage chamber 51 that stores the rotating body 20 is formed. Similar to the pump body 10, the spacer 140 is a member constituting the housing 50 as necessary.

  A rear shaft fixing portion (shaft support portion) 41e that protrudes forward is formed at the center of the bottom 41b of the storage portion 41a (the back center in the storage portion 41a), and the rear shaft fixing portion 41e includes The rear end portion of the ceramic shaft 60 that rotatably supports the rotating body 20 is fixed.

  The shaft 60 is held by the separation plate 41 so as not to rotate. For example, the contour shape of the rear end portion of the shaft 60 is D-shaped, and the inner peripheral surface of the rear shaft fixing portion 41e is D-shaped corresponding to the rear end portion of the shaft 60, so that the D-shape of the shaft 60 If the rear end portion is fitted into the rear shaft fixing portion 41e, the shaft 60 can be held on the separation plate 41 in a non-rotatable manner.

  The magnetic drive unit 42 is a stator having a stator core 42a formed of an electromagnetic steel plate and a coil 42b wound around the stator core 42a while achieving electrical insulation, and is provided so as to surround the peripheral wall portion 41c of the storage unit 41a. It has been.

  The control unit 43 is a control board that controls the magnetic drive unit 42 and is located behind the separation plate 41 and the magnetic drive unit 42. The control unit 43 is electrically connected to the coil 42 b of the magnetic drive unit 42. When the control unit 43 energizes the coil 42 b of the magnetic drive unit 42, a magnetic field that rotates a magnetic driven unit 80 (described later) of the rotating body 20 is generated in the magnetic drive unit 42.

  The mold resin 44 can be formed of, for example, an unsaturated polyester resin, and is located outside the separation plate 41 and integrally includes the separation plate 41, the magnetic drive unit 42, and the control unit 43.

  The rotating body 20 includes an impeller 70 as a pump unit provided at the front portion, and a magnetic follower 80 provided at the rear portion of the impeller 70. In the present embodiment, the impeller 70 and the magnetic follower 80 are connected via the connecting portion 90. And in this embodiment, the impeller 70, the magnetic follower 80, and the connection part 90 are integrally formed. That is, the impeller 70 is integrally formed on the front portion (one end side in the direction of the shaft 60) of the magnetic follower 80.

  The magnetic follower 80 of the rotating body 20 is accommodated in the accommodating portion 41a, and the impeller 70 is accommodated in the pump chamber 131.

  The magnetic follower 80 is a rotor that is housed in the housing 41 a and is rotatably supported by a shaft 60.

  The magnetic follower 80 includes a synthetic resin rotor portion 81, a magnet portion 82 provided on the outer peripheral side of the rotor portion 81, and a bearing 83 provided at the center of the rotor portion 81. In the present embodiment, the rotor portion 81 is made of polyphenylene ether (PPE) resin, the magnet portion 82 is a permanent magnet made of ferrite or SmFe, and the bearing 83 is made of a carbon-containing resin sliding material or ceramic. Has been.

  The rotor part 81 has a cylindrical bearing fixing part 81a penetrating in the front-rear direction and a magnet fixing part 81b surrounding the bearing fixing part 81a.

  The bearing fixing portion 81a includes a front small diameter portion 81c and a rear large diameter portion 81d, and a bearing 83 is inserted and fixed inside the small diameter portion 81c having a smaller diameter than the large diameter portion 81d. A shaft 60 is inserted through the bearing 83, and the rotating body 20 is supported by the shaft 60 so as to be rotatable around the front-rear axis.

  The magnet fixing portion 81b is formed in a cylindrical shape, and the front portion of the inner peripheral surface of the magnet fixing portion 81b is integrally connected to the small diameter portion 81c of the bearing fixing portion 81a. A magnet housing groove 81e is formed on the outer peripheral surface of the magnet fixing portion 81b.

  The magnet housing groove 81e houses a magnet portion 82 covered with a stainless steel magnet cover 82a. The magnet cover 82 a may not be provided, and the outer peripheral surface of the magnet unit 82 may be exposed on the outer periphery of the magnetic follower (rotor) 80.

  The magnet portion 82 provided on the outer peripheral portion of the rotor portion 81 is located inside the magnetic drive portion 42, and the peripheral wall portion of the storage portion 41 a of the separation plate 41 is between the magnet portion 82 and the magnetic drive portion 42. 41c is arranged. A gap d1 for allowing rotation of the magnetic follower 80 is formed between the magnet 82 and the peripheral wall 41c (in this embodiment, the separation plate cover 160).

  An impeller 70 as a pump unit located in front of the magnetic follower 80 includes a plurality of blade portions 71 provided in the circumferential direction of the impeller 70, a rear shroud 72 covering the rear side of each blade portion 71, and each blade. And a front shroud 73 covering the front side of the portion 71.

  The front end of the rotor portion 81 is connected to the center portion of the rear shroud 72 formed in a disk shape via a connection portion 90. The magnet portion 82, the magnet cover 82a, the bearing 83, and the connection portion 90 are integrally provided with the rear surface shroud 72 and the rotor portion 81 by being inserted into a mold for forming the rear surface shroud 72 and the rotor portion 81. That is, the rear shroud 72 and the magnetic follower 80 are insert molded products.

  The front shroud 73 is composed of a conical portion 73a whose diameter decreases toward the front portion, and a cylindrical portion 73b formed at the front portion of the conical portion 73a. The front portion of the cylindrical portion 73b has a front-rear direction. A penetrating suction port 74 is formed.

  Further, the outer peripheral edge of the front shroud 73 (the outer peripheral edge of the conical portion 73 a) and the outer peripheral edge of the rear shroud 72 are arranged at the same position in the radial direction of the impeller 70. A gap is formed between the outer peripheral edge of the front shroud 73 and the outer peripheral edge of the rear shroud 72.

  The gap communicates with the suction port portion 74 through a flow path 75 formed between the adjacent blade portions 71 between the shrouds 72 and 73, and the discharge portion 76 of the impeller 70 is configured by the gap. Yes.

  Each blade portion 71 is formed in a range from the inner peripheral side of the front shroud 73 to the outer peripheral edge of the front shroud 73 (that is, the outer peripheral edge of the rear shroud 72). The front end of each blade portion 71 is integrally connected to the rear surface of the conical portion 73a of the front surface shroud 73, and each blade portion 71 and the front surface shroud 73 are integrally formed. On the other hand, the rear end of each blade portion 71 is attached to the front surface of the rear shroud 72.

  Each blade 71 applies a radial pressure to the liquid introduced into the flow path 75 via the suction port 74 when the impeller 70 rotates. Thereby, the liquid supplied from the suction port portion 74 to the flow path 75 is sent to the outer peripheral side of the impeller 70 and discharged from the discharge portion 76 to the outer peripheral side of the impeller 70.

  In the present embodiment, the connection portion 90 is formed with a reflux hole 91 for returning the liquid that has flowed to the rear side of the impeller 70 to the pump chamber 131. Note that a plurality of reflux holes 91 are preferably formed along the circumferential direction of the connecting portion 90.

  FIG. 2: shows the top view of the casing in the pump concerning Embodiment 1 of this invention. Moreover, FIG. 3 shows the perspective view which looked at the casing in the pump concerning Embodiment 1 of this invention from the inner side.

  As shown in FIGS. 1 to 3, the casing 30 is formed in a container shape that opens to the rear, and the casing 30 has a wall portion 32. And the front side of the accommodating part 41a is covered with the casing 30 by making the outer peripheral side rear edge of the wall part 32 contact | abut to the front-surface outer peripheral end part of the flange part 41d.

  The casing 30 is attached to the drive block 40 by attaching the outer peripheral portion of the wall portion 32 to the outer peripheral portion including the flange portion 41d of the drive block 40 with a plurality of screws, screws or the like (not shown). At this time, the sealing material 100 is interposed in the joint portion between the casing 30 and the flange portion 41d so that the watertightness of the rotating body storage chamber 51 can be secured.

  Further, the wall 32 of the casing 30 is connected to a pipe (not shown) and the like, and a suction pipe 35 for introducing the liquid into the pump chamber 131, and the liquid in the pump chamber 131 is connected to a pipe (not shown) and the like. A discharge pipe 36 that discharges to the outside (connected pipe or the like) is formed.

  The inside of the suction pipe 35 is a suction channel 35a, and a suction port 35b communicating with a channel such as a connected pipe is formed on the upstream side of the suction channel 35a. An opening 35c is formed on the downstream side of the suction passage 35a so as to face the suction port portion 74 of the impeller 70 and through which the volute portion 130 is inserted.

  In the present embodiment, the suction flow path 35a has a curved shape, and the upstream side extends in a direction intersecting the axis 60 direction, whereas the downstream side is substantially parallel to the axis 60 direction. So as to extend. That is, the suction port 35b opens in a direction intersecting the axis 60 direction (a direction perpendicular to the present embodiment), and the opening 35c opens on the rear side in the axis 60 direction (impeller 70 side). Yes.

  On the other hand, the inside of the discharge pipe 36 is a discharge flow path 36a, and a discharge port 36b communicating with a flow path such as a connected pipe is formed on the downstream side of the discharge flow path 36a. Further, the discharge port 36b is also opened in a direction intersecting the direction of the axis 60 (a direction perpendicular in the present embodiment).

  Further, in the present embodiment, the suction port 35 b and the discharge port 36 b are perpendicular to the direction of the axis 60 and are arranged on a straight line passing through the axis 60. That is, the suction port 35b and the discharge port 36b are arranged so that a straight line connecting the center of the suction port 35b and the center of the discharge port 36b intersects the straight line passing through the shaft 60 perpendicularly.

  By doing so, the pump 1 can be attached to a part of the piping arranged linearly.

  Further, a thread 35d and a thread 36d are formed on the outer circumferences of the suction pipe 35 and the discharge pipe 36, respectively, and are connected to the pipe using a nut or the like (not shown).

  In addition, a holding rib 35e and a holding rib 36e are formed on the center side of the screw thread 35d and the screw thread 36d formed on the outer periphery of the suction pipe 35 and the discharge pipe 36 of the casing 30, respectively. The holding rib 35e and the holding rib 36e are fixed by a tool when piping the pump 1.

  That is, in a state where the holding rib 35e and the holding rib 36e are fixed with a holding tool, the threaded joint 35d and the pipe joint connected to the threaded 36d can be tightened with a predetermined tightening torque with a dedicated tool.

  Further, by providing the holding rib 35e and the holding rib 36e, it is possible to inform the pump installer of the fixing of the holding tool by the holding rib 35e and the holding rib 36e. Therefore, it can suppress that the installation installer of a pump attaches the joint for pipes with the drive block 40.

  As described above, when the piping of the pump 1 is performed with the holding rib 35e and the holding rib 36e fixed with a tool, the casing 30 is compared with the case where the pipe joint is attached with the drive block 40 held. It is possible to suppress the load from being removed from the screws and screws that fix the drive block 40. Therefore, it becomes possible to more reliably suppress water leakage due to loosening of screws and screws.

  Further, it is desirable that the shape of the holding rib 35e and the holding rib 36e is a polygon. In this way, the holding rib 35e and the holding rib 36e can be held at multiple angles using the holding tool. In the present embodiment, the shape of the holding rib 35e and the holding rib 36e is a hexagon.

  Further, it is desirable that the centers of the polygonal holding rib 35e and the holding rib 36e are on a straight line connecting the centers of the suction port 35b and the discharge port 36b. If it carries out like this, the center of a holding tool can be located on the straight line of the pump 1 and piping, and it becomes possible to clamp | tighten a pipe joint with an exclusive tool easily.

  Here, in the present embodiment, as described above, the volute portion 130 is formed separately from the casing 30.

  4A and 4B are views showing a volute part in the pump according to the first embodiment of the present invention, in which FIG. 4A is a perspective view of the volute part seen from the casing side, and FIG. The perspective view seen from is shown.

  An opening 135 that communicates with the suction flow path 35a is formed on the front side and the radially inner side of the volute 130.

  Specifically, the volute part 130 is formed in a step shape in which an annular projecting part 137 is formed on the front side (casing 30 side) of the rear stage part 136, and on the front side and the radially inner side of the projecting part 137. An opening 135 communicating with the suction flow path 35a is formed.

  In other words, an annular protrusion 137 is provided on the casing 30 side of the volute 130 so as to surround the opening 135.

  A pump chamber 131 is formed in the volute unit 130. The pump chamber 131 has a circular impeller housing chamber 131a in a plan view that houses the impeller 70, and a volute structure that is formed in the outer periphery of the impeller housing chamber 131a and has a spiral shape in a plan view that gives a pressure increasing effect to the liquid. 131b.

  Therefore, the liquid discharged from the discharge part 76 to the outer peripheral side of the impeller 70 is introduced into the volute structure 131b, and the pressure is increased in the volute structure 131b. The volute structure 131b communicates with the upstream side of the discharge flow path 36a in a state where the volute 130 is assembled to the casing 30.

  With this configuration, the liquid discharged from the discharge portion 76 of the impeller 70 to the volute structure 131b is increased in pressure in the volute structure 131b and passes through the discharge port 36b of the discharge passage 36a. Will be discharged.

  Then, a protrusion 136 b formed on the casing 30 side of the volute 130 (the front surface 136 a of the rear stage 136) is inserted in the direction of the axis 60 along the concave portion 37 provided on the inner surface of the casing 30, and around the opening 135. The outer peripheral surface 137b of the provided annular protrusion 137 is fitted into the concave portion 38 of the facing casing 30. By doing so, the volute part 130 is assembled to the casing 30.

  In the present embodiment, the upper surface (surface on the casing 30 side) 137a of the protrusion 137 is formed in a flat shape. And in the state which assembled | attached the volute part 130 to the casing 30, while the suction port 35b side (right side of FIG. 1) of the upper surface 137a formed planarly is exposed to the suction flow path 35a, it is the opposite side to the suction port 35b side. The protrusion 137 is configured so that (the left side in FIG. 1) is closed by the casing 30.

  That is, the upper surface 137a of the protrusion 137 has an exposed portion 137d formed on the suction port 35b side (right side in FIG. 1) in a state where the volute portion 130 is assembled to the casing 30, and on the side opposite to the suction port 35b side. A blocking portion 137c is formed.

  As shown in FIG. 4, the rear surface 38 a of the recess 38 is formed so as to increase in width toward the side opposite to the suction port 35 b, and overlaps with the rear surface 38 a on the upper surface 137 a of the protrusion 137. Becomes the closed portion 137c.

  Further, an R portion 137f is formed on the periphery of the upper surface 137a on the opening 135 side. The R portion 137f is the largest R portion on the suction port 35b side (right side in FIG. 1), and is formed so as to gradually become a smaller R portion as going to the opposite side.

  Further, the volute 130 is provided with a front shaft fixing portion (shaft support portion) 133 located at the center of the rotating body storage chamber 51, and the front end portion of the shaft 60 is fixed to the front shaft fixing portion 133. ing.

  The shaft 60 is held by the separation plate 41 so as not to rotate. The casing 30 and the separation plate 41 are fixed, and the volute part 130 is fixed to the casing 30. Therefore, the relative rotation of the shaft 60 with respect to the volute portion 130 is restricted even if the front end portion of the shaft 60 is not rotatably held by the front shaft fixing portion 133 of the volute portion 130.

  In the present embodiment, the front shaft fixing portion 133 is integrated with the volute portion 130 via a plurality of (three in this embodiment) support ribs 134 extending from the inner surface side of the protruding portion 137 toward the pump chamber 131. Is formed. Note that the front shaft fixing portion 133 does not need to be formed integrally with the volute portion 130.

  The front shaft fixing portion 133 includes a cone-shaped protruding portion 133a that protrudes toward the front portion, and a cylindrical bearing portion 133b that is connected to the rear portion of the protruding portion 133a and supports the front end portion of the shaft 60. Has been.

  In FIG. 1, reference numeral 110 denotes a bearing plate that receives a load in the thrust direction applied to the bearing 83, and reference numeral 120 denotes a buffer material that absorbs vibration of the shaft 60 and the like.

  An elastic material 150 is disposed between the casing 30 side surface of the volute unit 130 and the casing 30. In this embodiment, the elastic material 150 is an O-ring.

  In this way, by disposing the elastic material 150 between the casing 30 side surface of the volute 130 and the casing 30, the variation in the dimension in the direction of the shaft 60 is absorbed, and the front shaft fixing portion 133 is attached without rattling. To be able to.

  As the material of the casing 30, a material having high heat resistance, high rigidity, and high hardness is often used. In this embodiment, the casing 30 is made of PPS resin. On the other hand, the volute part 130 is made of PPE resin because it does not require strength as compared with the casing 30.

  In this way, by forming the volute portion 130 in which the front shaft fixing portion 133 is formed separately from the casing 30, the volute portion that is not affected by the water pressure resistance and does not require higher strength than the material of the casing 30. 130 and the front shaft fixing portion 133 can be formed of a cheaper material.

  The pump 1 having such a configuration is driven by energizing the coil 42b by the control unit 43. When a current flows through the coil 42b, a magnetic field is generated in the magnetic drive unit 42. Then, the magnet portion 82 of the rotating body 20 is attracted and repelled with respect to the magnetic drive portion 42 and the magnetic follower portion 80 rotates around the shaft 60, and thereby the impeller 70 extends forward and backward around the shaft 60. Rotate to.

  When the impeller 70 rotates, the liquid introduced into the flow path 75 of the impeller 70 through the suction port portion 74 is discharged from the discharge portion 76 to the outer peripheral side of the impeller 70. The liquid discharged to the outer peripheral side of the impeller 70 is basically introduced into the volute structure 131b and is pressurized in the volute structure 131b. Thereafter, the liquid is discharged to the outside of the pump 1 through the discharge port 36b in a state where the pressure is increased in the volute structure 131b.

  By the way, a part of the liquid passes through the flange gap d3 between the outer peripheral edge of the rear shroud 72 and the flange 41d of the separation plate 41, flows into the rear of the rear shroud 72, and tries to flow into the storage portion 41a. To do.

  At this time, if a foreign substance (magnetic body such as iron powder) that may adhere to the magnet part 82 is mixed in the liquid, the foreign substance (magnetic body such as iron powder) adheres to the magnet part 82 and rotates. There is a possibility that the rotation of 20 may be obstructed or locked.

  Therefore, in the present embodiment, the separation plate cover 160 formed of SUS is disposed on the inner surface of the separation plate 41, and the foreign matter (magnetic material such as iron powder) that enters the storage portion 41a and is attracted to the magnet portion 82 is disposed. ) Is rotated together with the magnetic follower 80 to prevent the inner surface of the separation plate 41 from being damaged.

  In the present embodiment, an annular spacer 140 is disposed on the inner peripheral surface of the opening of the separation plate 41.

  5A and 5B are diagrams showing a spacer in the pump according to the first embodiment of the present invention, in which FIG. 5A is a perspective view of the spacer viewed from the casing side, and FIG. FIG.

  The spacer 140 is made of resin, and as shown in FIGS. 1 and 5A and 5B, the casing 30 side end surface 140a of the spacer 140 forms a part of the volute structure 131b. Then, the outer periphery of the casing 30 side end surface 140a is pushed by the rear end surface 130a of the volute 130, and the outer periphery of the casing 30 side end surface 140a is interposed between the rear end surface 130a and the separation plate 41, thereby fixing the spacer 140. Yes.

  A protrusion 140b is formed on the end surface 140a on the casing 30 side, and the protrusion 140b is inserted into the recess 130b on the rear end surface 130a of the volute 130 so that the spacer 140 is prevented from rotating. Yes.

  Furthermore, in the present embodiment, a rib 140c that protrudes along the inner peripheral surface of the opening of the separation plate 41 is formed on the rear side of the spacer 140, and the rib 140c presses the flange portion 160a of the separation plate cover 160. The separation plate cover 160 is fixed while being sandwiched between the separation plate 41 and the spacer 140.

  In this embodiment, since the impeller 70 having a large gap between the outer peripheral portion of the impeller 70 and the inner peripheral portion of the flange portion 41d is used, the spacer 140 is disposed on the outer periphery of the impeller 70, and the impeller The gap with the outer periphery of 70 is made small.

  However, in order to increase the pump efficiency, when using an impeller 70 (an impeller 70 having a large outer diameter) in which the gap between the outer peripheral portion of the impeller 70 and the inner peripheral portion of the flange portion 41d is not so large, There is no need to use the spacer 140.

  As described above, the pump 1 includes the casing 30 in which the suction flow path 35 a and the discharge flow path 36 a are formed, the pump chamber 131 formed in the casing 30, and the impeller accommodated in the pump chamber 131. 70 and a shaft 60 that rotatably supports the impeller 70.

  A volute portion 130 formed separately from the casing 30 is provided on the casing 30 side of the pump chamber 131, and an opening portion 135 communicating with the suction flow path 35 a is provided on the radially inner side of the volute portion 130. Is formed. The volute 130 is formed with a front shaft fixing portion (shaft support portion) 133 that supports the shaft 60.

  In this way, by forming the volute portion 130 in which the front shaft fixing portion (shaft support portion) 133 is formed separately from the casing 30, a plurality of types of volute portions 130 corresponding to various pump performances are formed, The casing 30 can be arbitrarily exchanged.

  And while sharing the casing 30 made of an expensive resin material having high heat resistance, high rigidity and high hardness, the replaceable volute portion 130 corresponding to various pump performances is made of a material cheaper than the casing 30. It can be configured.

  Thus, according to this embodiment, the low-cost pump 1 which can respond to various pump performances can be provided.

  In the present embodiment, the suction port 35b of the suction channel 35a and the discharge port 36b of the discharge channel 36a are arranged in a direction intersecting the axis 60 direction, and the suction channel 35a has a shaft on the downstream side. The shape is curved so as to be substantially parallel to the 60 directions. An annular protrusion 137 protruding around the opening 135 is formed on the casing 30 side of the volute part 130, and an upper surface 137a of the protrusion 137 is formed in a flat shape.

  Further, the protrusion 137 is configured such that the suction port 35 b side of the flat upper surface 137 a is exposed to the suction flow path 35 a and the opposite side to the suction port 35 b side is closed by the casing 30.

  Therefore, in the upper surface 137a of the projecting portion 137 formed in a planar shape, the suction port 35b side can be a part of the suction flow path 35a, and the sharp bend in the suction flow path 35a can be eliminated. As a result, the flow of the liquid in the suction flow path 35a becomes smooth, and the pump efficiency can be increased.

  Specifically, on the upstream side of the suction flow path 35a (in the flow path before bending), the liquid is in a direction that intersects with the direction of the axis 60 and becomes the front side toward the downstream side. On the downstream side of the flow and suction flow path 35a (in the flow path after bending), the liquid flows to the rear side in the direction of the axis 60.

  That is, the suction flow path 35 a is bent at an acute angle so that the downstream side faces the suction port portion 74. In this way, when the suction flow path 35a is bent at an acute angle so that the downstream side faces the suction port portion 74, the flow of the liquid flowing in the suction flow path 35a changes to an acute angle, and the liquid smoothly flows. Is disturbed.

  However, in the present embodiment, the upper surface 137a of the projection 137 formed in a planar shape is exposed at the inner bent portion (right side in FIG. 1) of the suction flow path 35a, and is used as a part of the suction flow path 35a. For this reason, it is possible to eliminate sharp bends in the suction flow path 35a, and the flow of the liquid in the suction flow path 35a becomes smooth, so that the pump efficiency can be increased.

  Further, the shaft 60 when the volute portion 130 in which the front shaft fixing portion (shaft support portion) 133 is formed is attached to the casing 30 at the portion (closed portion 137c) closed by the casing 30 opposite to the suction port 35b side. The positioning can be performed in the direction, and the assembling accuracy can be improved and the assembling property can be improved.

  In the present embodiment, an R portion 137f is formed on the periphery of the upper surface 137a on the opening 135 side. The R portion 137f is the largest R portion on the suction port 35b side (right side in FIG. 1), and is formed so as to gradually become a smaller R portion as going to the opposite side.

  Therefore, the curved portion of the suction flow path 35a can be formed more gently, the liquid flow in the suction flow path 35a becomes smoother, and the pump efficiency can be further increased.

  In the present embodiment, the elastic material 150 is disposed between the volute 130 and the casing 30. As a result, since the variation in the dimension in the direction of the shaft 60 is absorbed by the elastic material 150, the front shaft fixing portion (shaft support portion) 133 can be attached without rattling.

  Next, modified examples of the casing and the volute part will be described.

  FIG. 6 shows a perspective view of a casing according to a modification of the first embodiment of the present invention as viewed from the inside. FIG. 7 is a perspective view of the volute portion according to the modification of the first embodiment of the present invention as viewed from the casing side.

  The casing 30A and the volute part 130A have basically the same configuration as the casing 30 and the volute part 130 shown in the first embodiment.

  Here, the main difference between the casing 30A and the volute part 130A from the casing 30 and the volute part 130 shown in the first embodiment is that a protrusion 137e is provided on the outer peripheral surface 137b of the protrusion part 137 of the volute part 130A. The L-shaped groove 38b is provided in the recess 38 of the casing 30A.

  Then, the volute portion 130A is fixed to the casing 30 by inserting the protrusion 137e along the groove 38b and rotating the protrusion 137e at the innermost position of the groove 38b.

  Also according to the above modification, the same operations and effects as those of the first embodiment can be obtained.

  Further, in this modification, the volute portion 130A is fixed to the casing 30 by inserting the protrusion 137e along the groove 38b and rotating the protrusion 137e at the innermost position of the groove 38b. As a result, the protrusion 137e and the groove 38b can be used as a retaining structure, and the volute portion 130A and the casing 30A can be easily assembled.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, the above embodiment exemplifies the canned motor pump in which the suction pipe and the suction flow path are curved and can be attached to a part of the piping arranged in a straight line. It is also possible to provide a canned motor pump that has a suction flow path substantially coincided with the axial direction and is attached to a corner of a pipe bent in an L shape.

  Further, the specifications (shape, size, layout, etc.) of the casing, the suction pipe, and other details can be changed as appropriate.

  As described above, the pump according to the present invention has the volute part formed with the shaft support part formed separately from the casing, and therefore, for example, a line pipe built-in that forms a suction flow path in the casing by die cutting It can also be applied to a type of pump.

DESCRIPTION OF SYMBOLS 1 Pump 30,30A Casing 35a Suction flow path 35b Suction port 36a Discharge flow path 36b Discharge port 60 Shaft 70 Impeller 130, 130A Volute part 131 Pump chamber 133 Front shaft fixing part (shaft support part)
135 Opening portion 137 Protruding portion 137a Upper surface 150 Elastic material

Claims (4)

A casing in which a suction flow path and a discharge flow path are formed; a pump chamber formed in the casing; an impeller housed in the pump chamber; and a shaft that rotatably supports the impeller. In having a pump,
The casing side of the pump chamber is provided with a volute part formed separately from the casing,
On the radially inner side of the volute part, an opening communicating with the suction flow path is formed,
A pump characterized in that a shaft support portion for supporting the shaft is formed in the volute portion. The suction port of the suction flow channel and the discharge port of the discharge flow channel are arranged in a direction intersecting the axial direction, and the downstream side of the suction flow channel is substantially parallel to the axial direction. Has a curved shape,
On the casing side of the volute part, an annular protrusion is provided that protrudes around the opening,
The pump according to claim 1, wherein an upper surface of the protrusion is formed in a planar shape.   3. The protrusion is configured such that the suction port side of the upper surface formed in a planar shape is exposed to the suction flow path, and the side opposite to the suction port side is closed by the casing. The pump described in.   The pump according to any one of claims 1 to 3, wherein an elastic material is disposed between the volute portion and the casing.

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