JP2016148261A - Centrifugal pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal pump having a compact size in the direction of the axial core of a rotating shaft for actualizing smooth adjustment of the discharge amount of fluid.SOLUTION: The centrifugal pump includes a housing 1, an impeller 4 rotatably stored inside the housing 1 for sucking fluid from the direction of an axial core X of a rotating shaft 5b and discharging the sucked fluid in the peripheral direction of the rotating shaft, a driving rotation member 5 for driving and rotating the impeller 4, a pump chamber 6 formed inside the housing 1, and having a discharge port 3 for discharging the fluid to a peripheral wall face 11 of the housing 1 encircling an area on the outer periphery side of the impeller 4, and an opening adjusting mechanism 7 for adjusting the opening of the discharge port 3, the opening adjusting mechanism 7 including an adjusting member 7a provided between the impeller 4 and the peripheral wall face 11, and adapted to be turned around the axial core X of the rotating shaft 5b to adjust the opening of the discharge port 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a centrifugal pump that discharges a fluid sucked from the axial direction of a rotating shaft from a discharge port while swirling and flowing with an impeller.

Conventionally, as this type of centrifugal pump, for example, the one described in Patent Document 1 below exists. In Patent Literature 1, an impeller that sucks fluid from the axial direction of the rotating shaft and discharges the sucked fluid in a circumferential direction of the rotating shaft, a driving rotating member that drives and rotates the impeller, and the impeller are rotatable. A centrifugal pump having a pump chamber in which a discharge port is opened on a peripheral wall surface that surrounds and surrounds the outer peripheral side of the impeller and an opening adjustment mechanism that adjusts the opening of the discharge port is described.
The opening adjustment mechanism includes an annular adjustment member that continuously surrounds the outer peripheral side of the impeller, and is configured to adjust the opening of the discharge port by moving the adjustment member in the axial direction of the rotation shaft. is there.

Special table 2009-520899 gazette

  The conventional centrifugal pump needs to ensure a movement stroke of the adjusting member in the direction of the rotation axis. Therefore, the adjustment member drive mechanism and the like must be disposed at a position offset in the axial direction with respect to the impeller, and the centrifugal pump cannot be increased in size. For example, when the centrifugal pump is a water pump attached to an automobile engine, the axial extension of the rotating shaft means that the projecting space from the engine surface increases. In view of the limited space in the engine room, it is necessary to improve the increase in the size in the axial direction.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a centrifugal pump in which the discharge amount of fluid can be adjusted smoothly and the size of the rotation shaft in the axial direction is compact.

  The characteristic configuration of the centrifugal pump according to the present invention includes a housing and an impeller that is rotatably accommodated in the housing, sucks fluid from the axial direction of the rotating shaft, and discharges the sucked fluid in the circumferential direction of the rotating shaft. A drive rotation member that drives and rotates the impeller, a pump chamber that is formed inside the housing and that has a discharge port for discharging the fluid on a peripheral wall surface of the housing that surrounds the outer peripheral side of the impeller, and An opening adjusting mechanism that adjusts the opening of the discharge port, and the opening adjusting mechanism is provided between the impeller and the peripheral wall surface, and is rotated by turning around the axis of the rotating shaft. And an adjustment member for adjusting the opening degree of the discharge port.

As in this configuration, in order to adjust the opening degree of the discharge port, an adjustment member that is located between the impeller and the peripheral wall surface of the pump chamber and rotates around the axis of the rotation shaft is provided. It is not necessary to secure a moving stroke in the direction. Therefore, a compact centrifugal pump can be obtained in the axial direction of the rotating shaft.
Further, due to the structure of a general centrifugal pump, the fluid discharge port is formed in a part of the circumference in the circumferential direction. A fluid flow path is formed on the upper side in the rotational direction of the impeller with respect to the discharge port, and a predetermined space is secured. As in this configuration, if the adjustment member that adjusts the opening degree of the discharge port is rotated around the axis of the rotation shaft, a member that shields the discharge port may be used in a part of the flow path of the fluid, It is possible to arrange them adjacent to each other. Therefore, with this configuration, the arrangement space of the adjustment member itself can be small, and the entire centrifugal pump can be configured compactly.

  In the centrifugal pump of the present invention, the adjusting member encloses the impeller while forming a fluid flow path around the impeller, and rotates around the axis of the rotary shaft inside the pump chamber. Thus, it can be configured to have a communication opening that communicates and blocks the discharge port.

  In this configuration, the impeller rotates inside the adjustment member, and a fluid flow path is formed inside the adjustment member and around the impeller. The positional relationship between the adjustment member and the impeller is unchanged except that the impeller rotates relative to the adjustment member. For example, the size of the gap between the impeller and the inner surface of the adjustment member and the size of the flow path are not changed. Therefore, the fluid discharge capability by the impeller is stably maintained. On the other hand, when the fluid is discharged from the discharge port, the entire adjustment member is rotated, and the communication opening formed in the adjustment member is aligned with the discharge port. This rotation angle only needs to be able to rotate at least by the width dimension of the communication opening along the circumferential direction around the axis of the rotation shaft. Thereby, the discharge port can be switched between a fully open state and a fully closed state. Furthermore, the mechanism for rotating the adjusting member around the axis of the rotating shaft can be easily formed because it only needs to instruct the adjusting member to rotate with respect to the main body of the centrifugal pump. Thus, by providing the adjustment member of this configuration, it is possible to simply configure the opening adjustment mechanism while maintaining good fluid discharge performance.

  Another characteristic configuration of the present invention is that a plurality of the communication openings and the discharge ports are arranged at intervals in the circumferential direction of the rotation shaft.

  When the fluid is discharged from the discharge port, a reaction force corresponding to the flow rate of the fluid acts on the adjustment member. Since the fluid discharge direction has a component in the radial direction with respect to the axis of the rotating shaft, an external force having a component perpendicular to the axis of the rotating shaft acts on the adjusting member when discharging the fluid. As a result, the rotating shaft is pressed in one direction, and a frictional force is generated in the bearing portion of the rotating shaft.

  However, as in the present configuration, by disposing a plurality of communication openings and discharge ports at intervals in the circumferential direction of the rotation shaft, the external force that pushes the rotation shaft in the radial direction as described above is dispersed, and each The direction of action can be varied. As a result, for example, the frictional force acting on the bearing portion of the adjusting member is reduced, and the rotating operation of the adjusting member can be made extremely smooth. Moreover, generation | occurrence | production of unusual noise can also be suppressed. As described above, with this configuration, the frictional force of the bearing portion and the like is reduced, and as a result, the durability and reliability of the opening adjustment mechanism are improved.

  Another feature of the present invention lies in that each of the plurality of communication openings has the same opening area and is arranged at equal intervals in the circumferential direction of the rotating shaft.

  With this configuration, the reaction force acting on the rotation shaft of the impeller as the fluid is discharged is more evenly distributed in the circumferential direction of the rotation shaft, and the rotation of the impeller becomes smoother. Durability and reliability will be further improved.

  According to another characteristic configuration of the present invention, the opening adjustment mechanism disperses the solenoid coil around the axis of the rotation shaft with respect to the housing, and the adjustment member faces the solenoid coil. The conductive member is dispersedly arranged along the circumferential direction of the rotation shaft, and the adjustment member is rotated along the circumferential direction by energizing the solenoid coil.

  If it is this structure, a solenoid coil and a conductive member can be easily arrange | positioned in the state which opposes around the shaft center of a rotating shaft. Further, the amount of movement of the conductive member can be arbitrarily determined by changing the energization amount to the solenoid coil. Therefore, even when the position of the solenoid coil is either on the outer side or the inner side in the radial direction with respect to the position of the discharge port, there is a difference between the rotation angle of the conductive member and the opening / closing angle of the discharge port. The opening / closing operation of the discharge port can be reliably performed by setting the energization amount.

  In another feature of the present invention, the rotating device rotates the adjusting member to the opening decreasing side when the solenoid is energized, and holds the adjusting member at the maximum opening position when the energization to the solenoid is stopped. There is in point to do.

  With this configuration, when the energization of the solenoid is stopped, a maximum flow rate corresponding to the rotation speed of the impeller can be secured. Therefore, the fluid can be reliably discharged even when a situation occurs in which the solenoid cannot be energized, for example, when the solenoid fails.

  Another characteristic configuration of the present invention is that the adjusting member includes a pressing surface that is pressed toward the maximum opening by the fluid discharged in the circumferential direction of the rotating shaft by the impeller.

  With this configuration, when the energization to the solenoid is stopped, the adjustment member can be held at the maximum opening position by the fluid pressure that presses the pressing surface. In this way, for example, when the engine is operating, such as when the centrifugal pump is installed as a cooling pump for an automobile engine, the solenoid should be energized in principle when cooling water is required to circulate. The cooling function can be exhibited without any problems. That is, the power consumption can be minimized while the function of the centrifugal pump is exhibited. In addition, even when the solenoid fails, the opening degree of the adjusting member is maximized to ensure the fluid flow rate, and a highly reliable centrifugal pump can be obtained.

  In the centrifugal pump of the present invention, an urging mechanism for urging the adjusting member toward the maximum opening degree can be provided.

  With this configuration, the adjustment member can always be urged toward the maximum opening position, and fluid can be circulated regardless of whether the solenoid is energized or the impeller is rotated. Therefore, for example, the fluid can be reliably circulated from the initial rotation of the impeller.

  In another feature of the present invention, the adjustment member includes a fluid pressure receiving surface on which a fluid pressure opposite to a fluid discharge direction by the impeller acts, and the fluid pressure of the fluid discharged from the discharge port is adjusted. This is in that a pressure introduction path for acting on the fluid pressure receiving surface is provided.

  When the fluid flows inside the adjustment member, the frictional force of the fluid acts on the fluid flow path formed inside the adjustment member. Therefore, an external force acts on the adjustment member on the lower side of the fluid flow direction, that is, the impeller rotation direction. This external force changes according to the rotational speed of the impeller.

  In the centrifugal pump of this configuration, there is a case where it is desired to change the fluid discharge flow rate regardless of the rotation speed of the impeller. However, when the magnitude of the external force acting on the adjusting member changes depending on the rotation speed of the impeller, the operating force of the solenoid needs to be set to a sufficiently large value in order to drive the adjusting member with good responsiveness by the solenoid. .

  Therefore, as in this configuration, by adopting a configuration in which pressure is introduced in a direction to cancel the frictional force due to the fluid, the external force acting on the adjusting member can be set within a certain range regardless of the rotation speed of the impeller. . Therefore, the adjusting member can be driven with good responsiveness without increasing the power capacity of the solenoid.

  Another feature of the present invention is that the adjusting member is supported by the drive rotating member via a sliding bearing so as to be relatively rotatable.

  If it is this structure, the assembly | attachment precision of an adjustment member and a drive rotation member can be improved, and generation | occurrence | production of the play of an adjustment member and abnormal noise can be prevented.

  According to another characteristic configuration of the present invention, the adjustment member includes a peripheral wall portion that surrounds the outer peripheral portion of the impeller from a direction orthogonal to the axis of the rotary shaft, and one end side of the outer peripheral portion in the axial direction of the rotary shaft. A first side wall portion that surrounds the outer peripheral portion and a second side wall portion that surrounds the outer peripheral portion from the other end side in the axial direction of the rotary shaft, and the peripheral wall portion is integrated with the first side wall portion. And a first peripheral plate that is divided in the axial direction of the rotary shaft into a second peripheral wall portion that is integral with the second side wall portion, and wherein the first peripheral wall portion and the second peripheral wall portion protrude to the outer peripheral side; Each of the second flange plates is provided separately, and the first flange plate and the second flange plate are sandwiched by a connector, and the connector is circumferential with respect to the first and second flange plates. It is in the point provided with the clamping piece which contacts continuously along.

  If the adjusting member includes a peripheral wall portion surrounding the outer peripheral portion of the impeller, a first side wall portion, and a second side wall portion as in this configuration, the fluid sucked from the axial direction of the rotating shaft and the first peripheral wall portion are It is possible to efficiently swirl and flow in the region partitioned by the side wall portion and the second side wall portion.

  Further, since the peripheral wall portion is divided into the first peripheral wall portion integral with the first side wall portion and the second peripheral wall portion integral with the second side wall portion in the axial direction of the rotating shaft, the impeller is divided into the first side wall portion. It can be easily assembled between the part and the second side wall part.

  Further, the first peripheral wall portion and the second peripheral wall portion are each provided with a first flange plate and a second flange plate protruding to the outer peripheral side, and a connecting tool for sandwiching the first flange plate and the second flange plate is provided as the first A clamping piece is provided that continuously abuts along the circumferential direction with respect to the collar plate and the second collar plate.

  For this reason, when a displacement that creates a gap between the first and second peripheral walls due to the fluid pressure acting on the inside of the peripheral wall occurs, the first and second peripheral walls are displaced away from each other. Accordingly, each of the first and second ribs is pressed against the holding piece. Thereby, it is possible to suppress outflow of fluid leaking from the gap between the first and second peripheral wall portions to the side of the coupler from between the first and second ribs and the sandwiching piece, It is easy to secure the fluid discharge amount according to the rotation speed of the impeller.

It is a longitudinal cross-sectional view of a centrifugal pump. It is the top view which looked at the adjustment member of a full open position from the inlet side. It is the top view which looked at the adjustment member of a fully closed position from the inlet side. It is sectional drawing which shows the detail of an opening degree adjustment mechanism. It is a longitudinal cross-sectional view which shows the centrifugal pump of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the centrifugal pump of 3rd Embodiment. It is a longitudinal cross-sectional view of the principal part which shows the centrifugal pump of 4th Embodiment. It is the top view which looked at the adjustment member of the full open position in the centrifugal pump of 4th Embodiment from the inlet side. It is the top view which looked at the adjustment member of the fully closed position in the centrifugal pump of 4th Embodiment from the inlet side. It is a disassembled perspective view of the principal part which shows the centrifugal pump of 4th Embodiment. It is a perspective view which shows the coupling tool in the centrifugal pump of 5th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 3 show a centrifugal pump of the present embodiment that is installed in an automobile engine. This centrifugal pump is equipped as a water pump that circulates engine cooling water (an example of fluid) between the engine and the radiator.

  The centrifugal pump includes an impeller 4 that discharges cooling water sucked from the suction port 2 from the discharge port 3 and a rotary shaft X that is horizontally oriented inside the housing 1 fixed to the engine body (not shown). It has a drive rotating member 5 that rotates around it, a pump chamber 6 that rotatably houses the impeller 4, and an opening adjustment mechanism 7 that adjusts the opening of the discharge port 3.

The drive rotation member 5 has a drive pulley 5a that rotates in conjunction with the crankshaft of the engine, and a drive shaft 5b to which the drive pulley 5a and the impeller 4 are fixed. The drive shaft 5b corresponds to a rotation shaft that rotates around the rotation axis X.
The housing 1 is configured by integrally connecting a first housing portion 1a that accommodates a drive shaft 5b and a second housing portion 1b that forms a pump chamber 6.

The first housing part 1a is provided with a boss part 8 through which the drive shaft 5b is inserted sideways, and a first mechanical seal 9a for preventing the inflow of moisture (drain) from the pump chamber 6 into the first housing part. It is.
The upper part of the drive shaft 5b is rotatably supported by the boss part 8 via the rolling bearing 10, and the lower part is supported by the first housing part 1a via the first mechanical seal 9a.

  The second housing portion 1b includes a plurality of (this embodiment) around a cooling water inlet 2 connected to a radiator (not shown) and the like and a rotation axis X connected to an engine water jacket (not shown). Two discharge ports 3 (see FIGS. 2 and 3) are provided.

  The suction port 2 and the discharge port 3 penetrate through the inside and outside of the second housing part 1b. The suction port 2 is opened coaxially with the rotation axis X. The two discharge ports 3 are opened in a direction orthogonal to the rotation axis X.

The pump chamber 6 includes a peripheral wall surface 11 that surrounds the outer peripheral side of the impeller 4, and two discharge ports 3 are opened at point-symmetrical positions around the rotation axis X of the peripheral wall surface 11.
Each of the two discharge ports 3 has a side having the same opening area, is formed in a rectangular shape along the direction of the rotation axis X, and is arranged at equal intervals in the circumferential direction of the rotation shaft 5b.
The impeller 4 sucks cooling water from the direction of the rotational axis X through the suction port 2 and discharges the sucked cooling water from the two discharge ports 3 while swirling and flowing in the circumferential direction of the drive shaft 5b.

As shown in FIGS. 2 and 3, the peripheral wall surface 11 of the pump chamber 6 has two arc-shaped first peripheral wall surfaces 11a centering on the rotation axis X, and the rotation axis X more than the first peripheral wall surface 11a. Two second peripheral wall surfaces 11b provided along a position close to, and two flat third peripheral wall surfaces 11c along a direction orthogonal to the rotation axis X.
The discharge port 3 opens at the center position in the circumferential direction of the first peripheral wall surface 11a.
The second peripheral wall surface 11b is curved so that the distance from the rotation axis X becomes longer toward the lower side of the impeller rotation direction A.

Each of the first peripheral wall surfaces 11a is arranged symmetrically with respect to the rotation axis X.
Each of the second peripheral wall surfaces 11b is continuous with the lower side of the impeller rotation direction A orthogonal to the upper side of the impeller rotation direction A of the first peripheral wall surface 11a.
Each of the third peripheral wall surfaces 11c is continuous in a state orthogonal to the lower side of the impeller rotation direction A of the first peripheral wall surface 11a and the upper side of the impeller rotation direction A of the second peripheral wall surface 11b.

  The opening adjustment mechanism 7 is provided between the impeller 4 and the peripheral wall surface 11 of the pump chamber 6, and is an adjustment member that can simultaneously adjust the opening of the two discharge ports 3 by turning around the rotation axis X. (Rotary valve) 7a, a solenoid-type rotation device 7b that drives and rotates the adjustment member 7a, and a control unit 7c that controls the operation of the rotation device 7b.

  The adjusting member 7a includes a peripheral wall portion 12 that surrounds the outer peripheral portion of the impeller 4 from a direction orthogonal to the rotation axis X, and an outer periphery of the impeller 4 from one end side in the direction along the rotation axis X (on the suction port 2 side). An annular first side wall portion 13 that surrounds and an annular second side wall portion 14 that surrounds the outer peripheral portion of the impeller 4 from the other end side in the direction along the rotation axis X (the first mechanical seal 9a side) are integrally provided. ing.

The adjusting member 7 a is supported between the peripheral wall surface 11 of the pump chamber 6 and the impeller 4 so as to be rotatable around the rotation axis X within a range of a constant rotation angle.
The outer peripheral portion of the impeller 4 rotates in a region surrounded by the peripheral wall portion 12, the first side wall portion 13, and the second side wall portion 14 in an annular shape.

  As shown in FIGS. 2 and 3, the peripheral wall portion 12 is provided with a shutter portion 12a having a communication opening 15b for communicating / blocking the inside of the peripheral wall portion 12 and the discharge port 3 at equal intervals in the circumferential direction of the rotary shaft 5b. Two are provided apart. FIG. 2 shows a state in which the communication opening 15b communicates with the discharge port 3 and the discharge amount is maximized. On the other hand, FIG. 3 shows a state where the communication opening 15b faces the first peripheral wall surface 11a and the pump discharge amount becomes zero. Next to the communication opening 15b in the shutter portion 12a, there is provided a slidable contact surface 17a that has an arc shape centered on the rotational axis X and faces the first peripheral wall surface 11a. The two slidable contact surfaces 17a are arranged symmetrically with respect to the rotation axis X. A shutter portion 15a is formed on the center side as viewed from the sliding contact surface 17a to block the discharge of running water when the circumferential contact surface 17a opens at the discharge port 3.

  The shutter portion 15a includes a slidable contact surface 17a that slidably contacts the first peripheral wall surface 11a, a first end surface 17b that faces the guide channel 16, and a second end surface 17c that faces the third peripheral wall surface 11c.

  Cooling water is guided to the shutter portion 15a through the inside of the adjustment member 7a. The peripheral wall portion 12b formed as a part of the adjusting member 7a is formed in a curved shape from each shutter portion 15a toward the lower side of the impeller rotation direction A. This curved shape is such that the distance from the rotational axis X becomes longer toward the lower side of the impeller rotation direction A, and the cooling water guide channel 16 is formed between the peripheral wall portion 12 b and the impeller 4. . As the impeller 4 rotates, the cooling water is swung out of the impeller 4 and then guided to the communication opening 15 b through the guide channel 16. More specifically, the guide channel 16 is formed by the peripheral wall portion 12 b, the first side wall portion 13, and the second side wall portion 14. The guide channel 16 is formed so that the cross-sectional area of the channel increases toward the lower side of the impeller rotation direction A so that the cooling water discharged to the outer peripheral side of the impeller 4 can be sequentially joined.

  The 1st side wall part 13 was extended along the inner periphery of the cyclic | annular board part 13a extended annularly toward the rotating shaft core X side along the peripheral edge of the surrounding wall part 12b, and the cyclic | annular board part 13a. A support plate portion 13b and a cylindrical plate portion 13c protruding in a cylindrical shape toward the suction port 2 along the boundary between the annular plate portion 13a and the support plate portion 13b are provided.

The annular plate portion 13a is formed in a truncated cone shape that protrudes toward the suction port 2 side.
The support plate portion 13b includes a plurality of inflow openings 18 in the circumferential direction for allowing cooling water from the suction port 2 to flow into the impeller 4 side, and a bottomed cylindrical boss 19 that is externally fitted to the distal end portion of the drive shaft 5b. It has.

  The boss 19 (adjustment member 7a) is press-fitted to the tip of the drive shaft 5b via the first sliding bearing 20 so as to be relatively rotatable around the rotation axis X. The first sliding bearing 20 includes a sliding member 20 a such as a resin interposed between the drive shaft 5 b and the boss 19.

  The second side wall portion 14 is annularly extended toward the rotation axis side along the peripheral edge of the peripheral wall portion 12b. The cylindrical plate portion 13c protrudes in a cylindrical shape along the direction of the rotation axis X with respect to the annular plate portion 13a. The annular plate portion 13a is held in a state of being inserted into the inner surface of the suction port 2 of the second housing portion 1b. Therefore, this part functions as a shaft support part of the adjustment member 7a in the second housing part 1b.

The housing 1 includes a first restricting portion 22 that restricts a rotation range of the adjustment member 7a toward the opening increase side, and a second restriction portion 23 that restricts a rotation range of the adjustment member 7a toward the opening decrease side. Is provided.
As the 1st control part 22, the 3rd surrounding wall surface 11c provided in the housing 1 functions. When the second end surface 17c of the adjusting member 7a comes into contact with the third peripheral wall surface 11c, the opening degree of the discharge port 3 is set to be fully open.
On the other hand, the second restricting portion 23 corresponds to a flat surface 11d formed in a region extending from the second peripheral wall surface 11b to the first peripheral wall surface 11a along the radial direction of the rotation axis X. When a part of the adjusting member comes into contact with the flat surface 11d, the discharge port 3 is held in the fully closed state.

  A portion of the first end face 17b of the shutter portion 15a that is located on the innermost peripheral side is formed in a tangential direction with respect to the rotation path a of the impeller 4. On the other hand, the outermost part of the first end surface 17b is formed in a state orthogonal to the sliding contact surface 17a. As described above, the first end surface 17b is formed in a curved shape, and the circulation direction of the cooling water flowing in a swirl (corresponding to the cooling water discharged in the circumferential direction of the rotating shaft 5b by the impeller 4) is changed by about 90 degrees. Guide to discharge port 3. Further, the adjusting member 7a rotates in the direction of rotation A by the force that the cooling water acts on the first end surface 17b and the frictional force that the cooling water exerts on the inner peripheral surface of the adjusting member 7a. In particular, since the angle of the outer peripheral portion of the first end surface 17b is an angle along the radial direction, the curved surface of this portion becomes a good pressing surface 24 when the cooling water rotates the adjusting member 7a.

  A pressure introduction path 26 branched from the discharge port 3 is opened in the third peripheral wall surface 11c. With this configuration, the pressure of the cooling water can be applied in the direction opposite to the rotation direction A on the second end surface 17c of the adjusting member 7a. However, the pressure is set to a value slightly smaller than the pressure in the direction along the rotation direction A by the first end face 17b. Thereby, for example, when the impeller 4 rotates without operating a solenoid described later, the communication opening 15b is fully opened, but the force with which the shutter portion 15a is pressed against the third peripheral wall surface 11c is the pressure introduction path 26. Compared to the case where there is no, it will be greatly relaxed. Therefore, even when it is desired to operate the communication opening 15b in the fully closed state during the rotation of the impeller 4, the force generated by the solenoid described later is weak, and the discharge amount of the pump can be adjusted efficiently.

  As shown in FIG. 1, the 1st housing part 1a has the two discharge paths 27a and 27b which discharge | emit the water | moisture content (drain) which leaked from the 1st mechanical seal 9a outside. The first discharge path 27a communicates with the outside from the drive pulley 5a side. The second discharge path 27 b communicates with the outside through the drain hole 28 a through the drain pocket 28.

  The rotation device 7b magnetically attracts the adjustment member 7a around the rotation axis X in the circumferential direction by energizing the solenoid 29, and drives and rotates the adjustment member 7a to the opening degree decreasing side. The solenoids 29 are distributed around the rotation axis X of the drive shaft 5b at a position between the rolling bearing 10 and the first mechanical seal 9a.

The solenoid 29 includes an armature 29a which is a conductive member extending in a cylindrical shape from the inner peripheral edge of the second side wall portion 14 in the direction of the rotation axis X, a solenoid coil 29b, and a cylindrical core around which the solenoid coil 29b is wound. 29c and ring-shaped yokes 29d and 29e. The adjusting member 7a and the armature 29a are integrally formed of a metal having conductivity. The armature 29a is held by the first housing part 1a via the second sliding bearing 30 so as to be relatively rotatable.
The core 29c is formed in a cylindrical shape having an annular plate-like first rod 44b and second rod 44c at both ends of a cylindrical portion 44a concentric with the rotation axis X. The solenoid coil 29b is wound around an annular circumferential groove portion 44d surrounded by the cylindrical portion 44a, the first flange 44b, and the second flange 44c.

  4 is a cross-sectional view taken along the line IV-IV in FIG. As shown in FIG. 4, the yokes 29d and 29e are alternately provided with four wide portions 45a adjacent to the armature 29a and four narrow portions 45b spaced apart from the armature 29a in the circumferential direction. The tip portion of the armature 29a constitutes four attracted portions 29f that are magnetically attracted by energizing the solenoid coil 29b. The suctioned portion 29f is provided intermittently along the circumferential direction of the drive shaft 5b.

The controller 7b controls the amount of rotation of the adjusting member 7a by PWM (Pulse Width Modulation) control of the solenoid 29 to adjust the opening degree of the discharge port 3 in the range of 0 to 100%.
In a state where the solenoid coil 29b is not energized and the adjustment member 7a is located at the maximum opening position (fully opened position), as shown in FIG. A part of the side is arranged so as to overlap the wide portion 45a of the yokes 29d and 29e in the rotational radial direction.

  The wide portions 45a of the yokes 29d and 29e are portions where the magnetic flux density when the solenoid coil 29b is energized is higher than that of the narrow portions 45b. For this reason, when the solenoid coil 29b is energized, each attracted portion 29f is attracted toward the corresponding wide portion 45a having a high magnetic flux density, the armature 29a rotates in the direction indicated by the arrow B, and the adjusting member 7a is ejected from the discharge port 3. Turn to close side.

  For this purpose, there are provided a pressing surface 24 that is pressed toward the maximum opening position by the coolant flowing in a swirling manner, and an urging mechanism 31 that biases the adjustment member 7a toward the maximum opening position. The urging mechanism 31 is configured by mounting a torsion coil spring concentrically with the rotation axis X over the second side wall portion 14 and the housing 1.

  In addition, without providing the spring-type urging mechanism 31, only the pressing surface 24 that is pressed toward the maximum opening position by the cooling water that flows in a swirling manner may be provided. In this case, the adjustment member 7a can be held at the maximum opening position when the energization of the solenoid coil 29b is stopped while the impeller 4 is rotating.

  The water pressure receiving surface 25 on which the water pressure opposite to the direction in which the cooling water swirls and flows (the cooling water discharge direction by the impeller 4) acts on the pressing surface 24 while the impeller 4 is rotating. The adjustment member 7a is provided so that it can be rotated with a light operating force toward the opening degree reduction side against the spring biasing force of the biasing mechanism 31.

  When an opening degree adjustment command for the discharge port 3 is input during the rotation of the impeller 4, the control unit 7 b adjusts the opening degree of the discharge port 3 to the commanded opening degree by PWM control of the solenoid 29. 7a is rotated.

[Second Embodiment]
FIG. 5 shows a second embodiment.
This embodiment is different from the first embodiment in that it has a recovery mechanism 32 that recovers moisture (drain) leaking from the first mechanical seal 9a into a reserve tank (not shown) through the second discharge path 27b. .

  The recovery mechanism 32 includes a communication passage 32a that connects one of the discharge ports 3 to the suction port 2, an axial flow pump blade 32b that is rotated by cooling water that flows through the communication passage 32a toward the suction port 2, and an axial flow pump blade. It has a volumetric pump rotor 32c driven by the rotation of 32b and a rotor chamber 32d for accommodating the volumetric pump rotor 32c.

  The positive displacement pump rotor 32c discharges moisture (drain) sucked through the second discharge passage 27b toward a reserve tank (not shown). A second mechanical seal 9b that partitions the rotor chamber 32d and the communication passage 32a in a watertight manner is provided on a connecting shaft 32e that connects the axial pump blade 32b and the volume pump rotor 32c.

  With this configuration, the structure in which the cooling water is recirculated from the discharge port 3 to the suction port 2 allows leakage of moisture leaked from the first mechanical seal 9a from the housing 1 without adding a drive structure by the engine. Can be prevented. Other configurations are the same as those of the first embodiment.

[Third Embodiment]
FIG. 6 shows a third embodiment.
This embodiment differs from the second embodiment in that in addition to the recovery mechanism 32, a generator 33 that is driven and rotated together with the volumetric pump rotor 32c by an axial flow pump blade 32b is provided. The input shaft 33a of the generator 33 is concentrically connected to the connecting shaft 32e.

  If it is this structure, the energy which the cooling water recirculated from the discharge outlet 3 to the suction inlet 2 can be collect | recovered as electrical energy. Other configurations are the same as those of the first embodiment.

[Fourth Embodiment]
7 to 10 show a fourth embodiment.
In the present embodiment, as shown in FIG. 7, each of the peripheral wall portions 12 b rotates into a first peripheral wall portion 34 a integrated with the first side wall portion 13 and a second peripheral wall portion 34 b integrated with the second side wall portion 14. 8 and 9, the peripheral wall 12 has two semicircular peripheral walls 12 around the center Y 1, Y 2 different from the rotation axis X, and the rotation axis X is centered. This is different from the first embodiment in that it has a point-symmetric position. FIG. 8 is a plan view of the adjustment member 7a in the fully opened position as viewed from the inlet 2 side. FIG. 9 is a plan view of the adjustment member 7a in the fully closed position as viewed from the inlet 2 side.

  As shown in FIG. 7, the end part along the circumferential direction of the 1st surrounding wall part 34a is equipped with the 1st rib 35a which protrudes to an outer peripheral side, and the edge part along the circumferential direction of the 2nd surrounding wall part 34b protrudes to an outer peripheral side. The second gutter plate 35b is provided. An end portion along the circumferential direction of the first flange plate 35a includes a first folded piece 37a folded in parallel with the first circumferential wall portion 34a, and an end portion along the circumferential direction of the second flange plate 35b is disposed with the second circumferential wall portion 34b. A second folded piece 37b folded in parallel is provided.

  A first heel resin material 38a made of synthetic rubber or the like that covers the front and back surfaces of the first peripheral wall portion 34a, the first heel plate 35a and the first folded piece 37a along the circumferential direction is bonded. A second collar resin material 38b made of a resin material such as synthetic rubber that covers the front and back surfaces of the second circumferential wall portion 34b, the second collar plate 35b, and the second folded piece 37b along the circumferential direction is bonded.

  The joint surface between the first glazing resin material 38a and the second glazing resin material 38b is formed in a flat surface. Of the first and second glazed resin materials 38 a and 38 b, the inner peripheral surface of the portion entering between the first side wall portion 13 and the second side wall portion 14 forms the side surface of the guide channel 16.

  The first peripheral wall portion 34a and the second peripheral wall portion 34b are connected in the direction of the rotational axis X by a connector 36 that sandwiches the first flange plate 35a and the second flange plate 35b from the direction along the rotational axis X. Yes. As shown in FIGS. 8 to 10, the connector 36 is formed in an arc shape concentric with the peripheral wall portion 12 b when viewed in the direction along the rotation axis X, and as shown in FIG. 7, as shown in FIG. A frame resin material made of a metal sandwiching frame 39 having a C-shaped cross section for sandwiching the first and second flange plates 35b from the direction along the rotation axis X and a resin material such as synthetic rubber bonded to the sandwiching frame 39 40.

  The sandwiching frame 39 includes a first sandwiching piece 36a that continuously contacts the first flange plate 35a along the circumferential direction, and a second contact that continuously contacts the second flange plate 35b along the circumferential direction. The sandwiching piece 36b is formed in a C-shaped cross section integrally provided.

  The sandwiching frame 39 is formed in an arc shape concentric with the peripheral wall portion 12b when viewed in the direction along the rotation axis X. The frame resin material 40 is bonded so as to cover the front and back surfaces of the first sandwiching piece 36a and the second sandwiching piece 36b in series along the circumferential direction.

The armature 29a includes a cylindrical portion 41a that extends in a cylindrical shape from the inner peripheral edge of the second side wall portion 14, a plurality of magnetic plates 41b that form a magnetic path when the solenoid 29 is energized, and the cylindrical portion 41a and the magnetic plate And a cylindrical resin material 41c made of a resin such as a synthetic rubber for integrally connecting 41b. The magnetic plate 41b is made of a magnetic material such as stainless steel, and is fixed to the inner peripheral side of the cylindrical resin material 41c with a space along the rotation axis X.
The magnetic plate 41b constitutes four attracted portions 29f that are magnetically attracted by energization of the solenoid coil 29b.

  As shown in FIGS. 8 and 9, for example, a resin sliding contact member 42 that forms the sliding contact surface 17 a of the shutter portion 12 a is bonded to the coupler 36. The sliding contact surface 17 a is concentric with the rotation axis X and is formed in an arc shape having an outer diameter slightly smaller than the inner diameter of the peripheral wall surface 11. The communication opening 15b is slid in a state of penetrating through the connecting portion 36, the overlapping portion of the first flange plate 35a and the second flange plate 35b, and the overlapping portion of the first flange resin material 38a and the second flange resin material 38b. It opens to the contact surface 17a.

  As shown in FIG. 10, if the first and second flange plates 35a, 35b and the connector 36 are formed in a concentric arc shape when viewed in the direction along the rotation axis X, as in this embodiment. The connecting tool 36 can be easily mounted in the direction of the arrow so that the first and second ribs 35a and 35b are inserted between the first clamping piece 36a and the second clamping piece 36b. Other configurations are the same as those of the first embodiment.

[Fifth Embodiment]
FIG. 11 shows a modification of the fourth embodiment.
In the present embodiment, the connector 36 is configured by embedding a plurality of metal holding frames 39 at intervals in the circumferential direction inside a resin material 43 formed in a circular arc shape with a resin such as synthetic rubber. .

  These sandwiching frames 39 have a C-shaped cross-section integrally including a flat rectangular first sandwiching piece 36a and a second sandwiching piece 36b, and are formed in a shape in which a flat plate material is bent at right angles along a straight line. In addition, it is not formed in an arc shape when viewed in the direction along the rotation axis X as shown in the fourth embodiment.

  With this configuration, the connecting tool 36 can be manufactured at low cost by using the holding frame 39 having a shape that allows easy sheet metal processing without using the arc-shaped holding frame 39 as shown in the fourth embodiment. . Other configurations are the same as those of the fourth embodiment.

[Other Embodiments]
1. The centrifugal pump according to the present invention may have an impeller that discharges the sucked fluid from a single discharge port.
2. In the centrifugal pump according to the present invention, the opening degree adjusting mechanism may include an adjusting member that can adjust the opening degree of the discharge port by an electric motor around the rotation axis or a manual turning operation.

  INDUSTRIAL APPLICABILITY The present invention can be used as a centrifugal pump and a flow rate adjustment valve for various uses having an impeller.

DESCRIPTION OF SYMBOLS 1 Housing 3 Discharge port 4 Impeller 5 Drive rotation member 6 Pump chamber 7 Opening adjustment mechanism 7a Adjustment member 7b Rotating device 11 Peripheral wall surface 12 Peripheral wall portion 13 First side wall portion 14 Second side wall portion 15b Communication opening 20 Sliding bearing 24 Press Surface 25 Fluid pressure receiving surface 26 Pressure introduction path 29 Solenoid 31 Energizing mechanism 34a First peripheral wall portion 34b Second peripheral wall portion 35a First flange plate 35b Second flange plate 36 Connector 36a, 36b Holding piece X Rotating shaft core

Claims (11)

A housing;
An impeller that is rotatably accommodated in the housing, sucks fluid from the axial direction of the rotating shaft, and discharges the sucked fluid in the circumferential direction of the rotating shaft;
A drive rotating member for driving and rotating the impeller;
A pump chamber formed inside the housing and provided with a discharge port for discharging the fluid on a peripheral wall surface of the housing surrounding the outer peripheral side of the impeller;
An opening adjustment mechanism for adjusting the opening of the discharge port,
Centrifugal pump provided with an adjusting member, wherein the opening adjustment mechanism is provided between the impeller and the peripheral wall surface, and adjusts the opening of the discharge port by turning around the axis of the rotary shaft. .   The adjusting member encloses the impeller while forming a fluid flow path around the impeller, and communicates with the discharge port by rotating around the axis of the rotating shaft inside the pump chamber. The centrifugal pump according to claim 1, further comprising a communication opening for blocking.   The centrifugal pump according to claim 1 or 2, wherein a plurality of the communication openings and the discharge ports are arranged at intervals in the circumferential direction of the rotation shaft.   The centrifugal pump according to claim 3, wherein each of the plurality of communication openings has the same opening area and is arranged at equal intervals in the circumferential direction of the rotation shaft.   The opening adjustment mechanism disperses the solenoid coil around the axis of the rotary shaft with respect to the housing, and conducts along the circumferential direction of the rotary shaft so as to face the solenoid coil in the adjusting member. The centrifugal pump according to any one of claims 1 to 4, wherein the centrifugal pump is configured so that the adjusting member is rotated along the circumferential direction by distributing the members and energizing the solenoid coil.   The centrifugal pump according to claim 5, wherein the rotating device rotates the adjusting member toward a decrease in opening when the solenoid is energized, and holds the adjusting member at a maximum opening when the energization is stopped.   The centrifuge according to any one of claims 1 to 6, wherein the adjustment member includes a pressing surface that is pressed toward the maximum opening by a fluid discharged in a circumferential direction of the rotating shaft by the impeller. pump.   The centrifugal pump as described in any one of Claims 1-7 provided with the urging mechanism which urges | biases the said adjustment member toward the opening maximum position.   The adjusting member includes a fluid pressure receiving surface on which a fluid pressure opposite to the direction in which the fluid is discharged by the impeller is applied, and pressure that causes the fluid pressure of the fluid discharged from the discharge port to act on the fluid pressure receiving surface The centrifugal pump according to any one of claims 5 to 8, wherein an introduction path is provided.   The centrifugal pump according to any one of claims 1 to 9, wherein the adjustment member is rotatably supported by the drive rotation member via a sliding bearing. The adjusting member includes a peripheral wall portion that surrounds the outer peripheral portion of the impeller from a direction orthogonal to the axis of the rotary shaft, a first side wall portion that surrounds the outer peripheral portion from one end side in the axial direction of the rotary shaft, A second side wall portion surrounding the outer peripheral portion from the other end side in the axial direction of the rotary shaft,
The peripheral wall portion is divided in the axial direction of the rotary shaft into a first peripheral wall portion integral with the first side wall portion and a second peripheral wall portion integral with the second side wall portion;
The first peripheral wall portion and the second peripheral wall portion each include a first rib plate and a second rib plate protruding to the outer peripheral side, and the first rib plate and the second rib plate are sandwiched by a connector. And
The centrifugal pump according to any one of claims 1 to 10, wherein the connector includes a clamping piece that continuously contacts the first and second rib plates along the circumferential direction.

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