JP2009097412A - Magnetic drive pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic drive pump capable of regulating a work quantity of the pump so as to supply a correct delivery force. <P>SOLUTION: The magnetic drive pump is provided with a partition wall 13 to separate a pump chamber 10 from the external, an impeller 20 disposed in the pump chamber to rotate around a rotation axial center X, an inductor 30 to rotate integrally with the impeller, a magnet unit 40 disposed at a position radially facing the rotation axial center to the inductor so as to be rotatable around the rotation axial center, a rotation drive means 2 to drive the rotation of a magnet unit, and a displacement mechanism 60 to change a radial interval between the magnet unit and the inductor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic drive pump that transmits rotational power to an impeller by a magnetic force, and is particularly suitable as a water pump for an engine.

  A conventional magnetically driven pump includes an impeller that is rotatably held in a pump chamber and causes a fluid to flow in the pump chamber by the rotation, and a drive mechanism that rotationally drives the impeller. A magnet that is integrally fixed to a drive member that is rotatably arranged outside a partition that separates the chamber and the outside, and an induction current that is integrally fixed to the impeller and generated by the rotation of the magnet is rotated using a power source. There is an engine water pump composed of an inductor (see, for example, Patent Document 1). This pump slips between the magnet and the inductor during high-speed rotation, so the engine speed and impeller speed are non-linear (the rate of increase of the impeller speed relative to the engine speed decreases) ). For this reason, during high-speed rotation of the engine, the impeller is prevented from rotating more than necessary, and no great waste is generated in the pump work. On the other hand, in the region where the engine speed is low or medium, the relationship between the engine speed and the impeller speed is linear, so the impeller speed corresponds to the engine speed. Even in this case, the cooling water is circulated more than necessary in an engine operation region that does not require a circulating amount of the cooling water, such as when the engine is rotating at a medium speed, when the engine is cold, or during a low load steady operation. As a result, deterioration of engine warm-up and fuel consumption due to useless work are caused.

Japanese Patent Laying-Open No. 2005-139917 (paragraph number 0004-0014, FIG. 1)

  This invention is made | formed in view of the said problem, and is providing the magnetic drive pump which can adjust the work volume of a pump so that appropriate discharge force may be supplied. When applied to an engine water pump, the amount of cooling water when the engine is cold can be reduced to shorten the cooling water temperature rise time, and fuel efficiency can be improved by appropriately adjusting the work volume of the pump. Is to provide a pump that can

  In order to solve the above problems, a magnetically driven pump according to the present invention includes a pump chamber, a partition that separates the pump chamber from the outside, an impeller that is disposed in the pump chamber and rotates around a rotation axis. An inductor that rotates integrally with the impeller around the rotation axis, and is rotatable around the rotation axis at a position facing the inductor in the radial direction of the rotation axis outside the partition. A displacement mechanism is provided that includes an arranged magnet unit and rotational drive means for rotationally driving the magnet unit, and changes a radial interval between the magnet unit and the inductor.

  According to this configuration, the magnetic force acting on the inductor is adjusted by changing the radial distance between the magnet unit and the inductor through the displacement mechanism. Therefore, by controlling the displacement mechanism, the transmission torque is adjusted, and the rotation speed of the impeller can be controlled in addition to the change in the rotation speed by the rotation driving means. When such a pump is applied to an engine water pump, when the temperature of the cooling water is low and the engine is cold, the radial interval between the magnet unit and the inductor is increased so that the engine speed and the impeller speed are reduced. The flow rate of the cooling water can be reduced by further reducing the rotational speed of the impeller from the linear relationship. As a result, the rise time of the cooling water temperature can be shortened, the engine load can be reduced, and fuel consumption can be reduced.

  The magnetic drive pump according to the present invention is further characterized in that the displacement mechanism is formed as a cam-type displacement mechanism having an operating body in which a cam portion for displacing the magnet unit in the radial direction is formed. According to this feature, the input operation displacement causes the magnet unit to displace in the perspective direction in the radial direction of the rotation axis with respect to the inductor through the change of the operation displacement at the cam portion. By adopting the cam portion, for example, the axial operation displacement can be easily changed to the radial operation displacement, so that the displacement mechanism can be incorporated in a limited small space. Also, in this embodiment, when the magnet unit is composed of a plurality of segments that are uniformly distributed in the circumferential direction at intervals around the inductor, at least one of the segmented magnet units is If the distance from the inductor is increased in the radial direction, the distance from the other magnet unit also increases. That is, when the operation displacement is input, the magnet unit is displaced in the perspective with respect to the inductor, and the distance between the magnet units is also displaced in the perspective. As a result, the transmission torque is adjusted more effectively, and the rotation speed of the impeller can be controlled effectively.

  Further, in the magnetic drive pump according to the present invention, the magnet unit can further swing around a support shaft parallel to the rotation axis provided at one end along the circumferential direction, and the displacement mechanism is It is formed as a swing displacement mechanism that swings the magnet unit in the radial direction by operating the other end along the circumferential direction of the magnet unit in the radial direction. According to this feature, when the magnet unit is swung, the magnet unit is displaced in the radial direction with respect to the inductor, so that the transmission torque is adjusted, whereby the rotation speed of the impeller can be controlled. Since the magnet unit performs a perspective displacement by operating the other end according to the lever principle, the operation force may be small, and the entire displacement mechanism can be configured compactly.

  As one specific configuration of the swing displacement mechanism, a rotation operation body that can rotate around the rotation axis that receives the rotation displacement, and one end pivotally supported by the rotation operation body and the other. It is proposed to include a link body whose end is pivotally supported by the other end of the magnet unit. In this configuration, the rotating operation body is rotated by the rotation displacement converted from the linear input operation displacement or the rotation displacement directly applied as the direct input operation, so that the link body is changed from the prone posture to the standing posture. This transition causes the magnet unit to swing and displace, and the other end is lifted. Therefore, the magnetic force acting on the inductor is reduced, and the rotational speed of the impeller can be reduced. Since the gap between the inductor and the inductor is adjusted by the swing displacement of the magnet unit, the magnetic force acting on the inductor can be changed slightly, and the desired impeller speed can be easily realized. Become.

  1 to 5 show a first embodiment when a magnetic drive pump according to the present invention is applied as a water pump 100 for an engine. The water pump 100 is fixed to the engine block 1 by fastening means (not shown).

  The water pump 100 includes a housing 12 that creates a pump space by being disposed so as to cover the recess 1 a formed in the engine block 1. The pump space is partitioned into a pump chamber 10 located on the engine block 1 side and an outer chamber 11 outside the pump chamber 10 by a nonmagnetic partition wall 13.

  An impeller 20 is disposed inside the pump chamber 10 so as to rotate around the rotation axis X. The impeller 20 is supported by a support shaft 22 via a bearing 21 coaxially arranged with the rotation axis X. The support shaft 22 is cantilevered by the partition wall 13 by fitting one end of the support shaft 22 into a bottomed cylindrical recess 13 a formed at the center of the partition wall 13. As the impeller 20 rotates inside the pump chamber 10, a flow of cooling water is generated in the pump chamber 10.

  The impeller 20 is provided with a sleeve portion 20a on the back surface thereof for receiving the bearing 21. A cylindrical inductor 30 is constituted by an iron core 31 fixed to the outer peripheral surface of the sleeve portion 20 a and a conductive portion (pure aluminum portion) 32 disposed on the iron core 31. The inductor 30 and the impeller 20 rotate integrally around the rotation axis X.

  Outside the radial direction of the inductor 30, the magnet unit 40 is arranged around the rotation axis X in the outer chamber 11 with the partition wall 13 interposed therebetween. Further, outside the inductor 30 in the axial direction, the magnet unit holder 50 is similarly arranged in the outer chamber 11 so as to rotate about the rotation axis X with the partition wall 13 interposed therebetween. Six magnet units 40 are equally arranged around the rotation axis X, and each magnet unit 40 is held by a magnet unit holder 50.

  The magnet unit 40 includes a segment-shaped permanent magnet 41 obtained by dividing a cylindrical magnet having a slightly larger diameter than the outer peripheral surface of the inductor 30 into six equal parts in the circumferential direction, and a yoke 42 to which the upper surface of the permanent magnet 41 is attached. It consists of. As is apparent from FIG. 5, the yoke 42 has a magnet mounting portion 42a having a mounting surface for the permanent magnet 41, an arm portion 42b extending in the axial direction from the magnet mounting portion 42a, and an axial center direction from the tip of the arm portion 42b. It consists of the extended leg part 42c. In addition, each permanent magnet 41 is arrange | positioned so that the north-pole and a south pole may face the inductor 30 by turns.

  The magnet unit holding body 50 includes a boss portion 51 coaxially arranged with the rotation axis X and a disc portion 52 connected to an end portion of the boss portion 51. A guide groove 52 a extending in the radial direction is formed on the outer peripheral portion of the disc portion 52. When the magnet unit 40 is assembled to the magnet unit holder 50, the arm portion 42a of the yoke 42 of the magnet unit 40 is inserted into the guide groove 52a. A guide pin 53 projects from the disc portion 52 at a position on a line connecting the guide groove 52 a and the rotation axis X. When the magnet unit 40 is assembled to the magnet unit holder 50, the guide pin 53 is also inserted into the guide long hole 43 provided in the leg portion 42c of the magnet unit 40. Thereby, the magnet unit 40 is guided and held by the magnet unit holder 50 and can be displaced in the radial direction. Further, six slits 52 b are formed extending from the center hole of the disc portion 52 on a line connecting the guide groove 52 a and the rotation axis X.

  The displacement mechanism 60 for displacing the magnet unit 40 in the radial direction is a cylindrical operation that is rotatably connected via a linear motion actuator 3 as an operation drive source, a spool 3a of the linear motion actuator 3, and a bearing 61. A body 62 is provided. The operating body 62 is inserted into the inner peripheral surface of the boss portion 51 and the disc portion 52 of the magnet unit holding body 50, receives the axial linear displacement of the spool 3a of the linear actuator 3 via the bearing 61, It is slidable in the axial direction along the inner peripheral surface of the disc part 52. The operating body 62 is provided with six cam portions 62 a that project in the axial direction as cam portions 62 a, and these cam portions 62 a can be inserted into the slits 52 b of the disc portion 52. An axially inclined surface 62b is formed on the outer peripheral portion of the cam portion 62a as a cam surface whose radial height continuously changes. The lower end portion of the leg portion 42c of the magnet unit 40 is in contact with the inclined surface 62b so as to function as a cam follower. The magnet unit 40 receives a large urging force in the axial direction due to the magnetic attractive force between the permanent magnet 41 and the dielectric 30, so that the leg portion 42c and the inclined surface 62b of the cam portion 62a are always in contact with each other. Is maintained.

  The boss portion 51 of the magnet unit holding body 50 is connected to the pulley 2 as a rotation driving means, and is rotatably supported by the bearing 4 attached to the shaft hole portion 12a of the housing 12. With this configuration, when the pulley 2 rotates, the magnet unit holding body 50 and the magnet unit 40 rotate around the rotation axis X.

  When the magnet unit 40 rotates around the rotation axis X, the inductor 30 rotates around the rotation axis X due to generation of transmission torque by magnetic induction. 1 and 3, the linear actuator 3 is controlled so as to pull out the spool 3a to the maximum stroke. As a result, the leg portion 42c of the magnet unit 40 is positioned at the lowest level of the inclined surface 62b of the cam portion 62a. The permanent magnet 41 is closest to the inductor 30. Thereby, the transmission torque between the magnet unit 40 and the inductor 30 becomes the maximum. That is, the rotational force of the impeller 20 is maximized and the pump discharge capacity is maximized.

  On the other hand, in FIGS. 2 and 4, the linear actuator 3 is controlled so as to retract the spool 3a to the minimum stroke. As a result, the leg portion 42c of the magnet unit 40 is at the highest level of the inclined surface 62b of the cam portion 62a. The permanent magnets 41 are located farthest from the inductor 30 and the distance between the permanent magnets 41 is increased. Thereby, the transmission torque between the magnet unit 40 and the inductor 30 is minimized. That is, the rotational force of the impeller 20 is minimized and the pump discharge capacity is minimized.

  In this way, by controlling the stroke of the spool 3a of the linear actuator 3, the pump discharge capacity can be changed from the maximum to the minimum. The linear actuator 3 is controlled by a control signal from the engine ECU 90. A control signal to the linear actuator 3 is determined by an algorithm stored in the engine ECU 90 based on a detection signal from a sensor (not shown) that detects a water temperature, a throttle opening, an engine speed, and the like.

  For example, when cooling performance is required, such as when the engine is heavily loaded or when the coolant temperature is high, the direct acting actuator 3 is controlled to maximize the pump discharge capacity. When the temperature is low, the linear actuator 3 is controlled to reduce the pump discharge capacity and reduce the excessive coolant flow rate.

  Thus, based on the engine speed, the coolant temperature, and the throttle opening, the engine ECU 90 outputs a control signal to the direct acting actuator 3 to adjust the radial interval between the magnet unit 40 and the inductor 30. Therefore, the cooling flow rate is always optimally controlled to the minimum necessary. When the engine is cold, the amount of cooling water can be reduced to achieve early warm-up, while reducing unnecessary power and improving fuel efficiency.

    FIGS. 6-10 has shown 2nd Embodiment at the time of applying the magnetic drive pump by this invention as the water pump 100 of an engine. The water pump 100 is also fixed to the engine block 1 by fastening means (not shown), and the housing 12, the partition wall 13 that creates the pump chamber 10 and the outer chamber 11, and the pulley 2 as the rotational drive means are substantially the first. It is the same as that of one embodiment. Furthermore, the configuration of the impeller 20, the bearing 21, the support shaft 22, and the inductor 30 that is fixed to the outer peripheral surface of the impeller 20 is also substantially the same as that of the first embodiment. Is the same.

  As is apparent from FIG. 10, the magnet unit 40 has the same six segment-shaped permanent magnets 41 as the first embodiment, but the yoke 45 has a different shape. The yoke 45 is a segment-like member having a lower surface that substantially matches the upper surface of the permanent magnet 41. That is, it is substantially constituted only by the magnet attachment portion 42a in the first embodiment. Pin holes 45 a are respectively formed on one end surfaces of both ends along the circumferential direction of the yoke 45.

  The magnet unit holding body 50 in the second embodiment is similar to the first embodiment, and a boss portion 55 coaxially arranged with the rotation axis X and a circle connected to the end of the boss portion 55. Although it has the board part 56, the shape differs a little. The boss portion 55 is connected to the pulley 2 and has a size that is rotatably supported by the bearing 4 attached to the shaft hole portion 12a of the housing 12, but is symmetric with respect to the shaft center. A through hole 55a is provided in the radial direction. Further, the circular plate portion 56 is formed with a circular concave portion so as to leave a peripheral wall portion, and six pin holes 56a arranged uniformly in the circumferential direction are provided on the end surface of the peripheral wall portion. One end of the support pin 57 is fitted into the pin hole 56a, and the other end of the support pin 57 is fitted into the pin hole 45a of the yoke 45, so that the disc portion 56 can swing the magnet unit 40 in the radial direction. Hold on.

  The displacement mechanism 60 in the second embodiment includes a cylindrical rotating operation body 65 that is rotatably connected via a spool 3a of a linear motion actuator 3 serving as an operation drive source and a bearing 61. This rotating operation body 65 receives the axial displacement of the spool 3 a of the linear actuator 3 via the bearing 61 and rotates while sliding in the axial direction along the inner peripheral surface of the disk portion 52. The rotating operation body 65 is formed with a disc portion 66 at the end thereof. The diameter of the disc portion 66 is substantially the same as the inner diameter of the circular recess of the disc portion 56 of the magnet unit holding body 50, and the rotating operation body 65 is placed on the inner peripheral surface of the boss portion 55 of the magnet unit holding body 50. When inserted, the disk portion 66 also enters the circular recess of the disk portion 56 of the magnet unit holder 50. The rotation operation body 65 is formed with two inclined long holes 65a extending inclined with respect to the axial direction so as to correspond to the through holes 55a provided in the boss portion 55 of the magnet unit holding body 50. . When the magnet unit holding body 50 and the displacement mechanism 60 are assembled, the free end portion of the guide pin 67 press-fitted into the through hole 55a of the magnet unit holding body 50 is inserted into the inclined elongated hole 65a of the rotating operation body 65. The With this configuration, when the rotation unit holding body 50 is displaced in the axial direction by the linear actuator 3, the rotation unit holding body 50 simultaneously rotates around the rotation axis X.

  Six link pins 68 that are evenly arranged in the circumferential direction protrude in the axial direction from the outer peripheral end of the disc portion 66 of the rotating operation body 65. One end of the operation pin 69 is inserted into the pin hole 45a in which the support pin 57 is not inserted among the two pin holes 45a provided in the yoke 45 of the magnet unit 40. The link pin 68 and the operation pin 69 are pivotally connected by a link body 70. That is, the free end of the link pin 68 is inserted into one link hole 70 a of the link body 70, and the operation pin 69 is inserted into the other link hole 70 a of the link body 70. With this configuration, when the rotation unit holding body 50 rotates in one direction, the link body 70 rises, and the magnet unit 40 swings radially upward so that the permanent magnet 41 moves away from the inductor 30 ( (See FIGS. 6 and 8). On the contrary, when the rotation unit holding body 50 is rotated in the other direction, the link body 70 is flattened and the magnet unit 40 is swung downward in the radial direction so that the permanent magnet 41 approaches the inductor 30. (See FIGS. 7 and 9).

  Accordingly, also in the second embodiment, by controlling the stroke of the spool 3a of the linear actuator 3, the pump discharge capacity can be changed from the maximum to the minimum.

In the above-described embodiment, the displacement mechanism 60 displaces the magnet unit 40 in the radial direction in order to change the radial interval between the magnet unit 40 and the inductor 30, but in the present invention, the displacement mechanism 60 does not exclude the configuration in which the radial interval between the magnet unit 40 and the inductor 30 is changed by displacing the inductor 30 in the radial direction.
In addition, the magnet unit 40 uses a segment-shaped (curved plate piece) permanent magnet, but other shapes can be adopted, and other magnetic field generating means other than the permanent magnet can be adopted. Is also possible.

  INDUSTRIAL APPLICATION This invention can be utilized as a magnetic drive pump applicable to each field | area which changes the transmission torque transmitted to an impeller from a rotation source by changing the radial direction space | interval between a magnet unit and an inductor.

Sectional drawing which shows 1st Embodiment of the magnetic drive pump by this invention in the approach state of a magnet unit and an inductor Sectional drawing which shows 1st Embodiment of the magnetic drive pump by this invention in the separation state of a magnet unit and an inductor III-III sectional view of FIG. Sectional view taken along line IV-IV in FIG. The disassembled perspective view which shows the magnet unit in the 1st Embodiment of the magnetic drive pump by this invention, a magnet unit holding body, and a displacement mechanism. Sectional drawing which shows 2nd Embodiment of the magnetic drive pump by this invention in the approach state of a magnet unit and an inductor Sectional drawing which shows 2nd Embodiment of the magnetic drive pump by this invention in the separation state of a magnet unit and an inductor VIII-VIII sectional view of FIG. IX-IX sectional view of FIG. The disassembled perspective view which shows the magnet unit, magnet unit holding body, and displacement mechanism in 2nd Embodiment of the magnetic drive pump by this invention.

Explanation of symbols

1 Engine block 2 Rotation drive means (pulley)
10 Pump room 11 Outer room (outside)
13 Bulkhead 20 Impeller 30 Inductor 40 Magnet unit 41 Permanent magnet 50 Magnet unit holder 60 Displacement mechanism 62 Operating body 62a Cam portion 65 Rotating operating body X Rotation axis

Claims (4)

A pump room,
A partition wall separating the pump chamber and the outside;
An impeller disposed in the pump chamber and rotating around a rotation axis;
An inductor that rotates about the rotational axis integrally with the impeller;
A magnet unit rotatably disposed around the rotation axis at a position facing the inductor in a radial direction of the rotation axis outside the partition;
A rotation driving means for rotating the magnet unit;
In a magnetically driven pump with
A magnetic force driven pump provided with a displacement mechanism for changing a radial interval between the magnet unit and the inductor.   The magnetic drive pump according to claim 1, wherein the displacement mechanism is formed as a cam-type displacement mechanism having an operation body in which a cam portion for displacing the magnet unit in a radial direction is formed.   The magnet unit is swingable about a support shaft parallel to the rotation axis provided at one end along the circumferential direction, and the other end of the magnet unit along the circumferential direction of the magnet unit is arranged in the radial direction. The magnetic drive pump according to claim 1, wherein the magnetic drive pump is formed as a swing displacement mechanism that swings the magnet unit in a radial direction when operated.   The swing displacement mechanism includes a rotation operation body that can rotate around the rotation axis that receives rotation displacement, one end pivotally supported by the rotation operation body, and the other end of the magnet unit. The magnetically driven pump according to claim 3, further comprising a link body pivotally supported by the magnet.

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