JP3528993B2 - Magnetic drive pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic drive pump for rotating an impeller by magnetic force. This pump can be used as a water pump or the like.

[0002]

2. Description of the Related Art For example, a water jacket is formed in a vehicle engine for cooling or the like, and a water pump is connected to the water jacket. In this water pump, a pump chamber is communicated with the water jacket, and an impeller is held inside the pump chamber so as to be rotatable about its axis.

In the water pump disclosed in Japanese Utility Model Laid-Open No. 60-159899, the driven permanent magnet of the impeller as an impeller is fixed at its axial center position, and is placed in the crank chamber separated from the pump chamber and the blocking plate. Uses a drive shaft having a drive-side permanent magnet parallel to the axis as a drive unit. The driven permanent magnet of the impeller and the driving permanent magnet of the drive shaft constitute each magnetic attachment means that rotationally drives the impeller by mutual magnetic force.

In this magnetic drive pump, the drive-side permanent magnet of the drive shaft exerts a magnetic force on the driven-side permanent magnet of the impeller, whereby the impeller is rotationally driven and a flow of circulating water occurs in the pump chamber. Thus, with this pump,
By separating the pump chamber in which the impeller is held from the crank chamber in which the drive shaft is held, the drive unit is provided outside the pump chamber, so the pump chamber and the crank chamber are sealed with a mechanical seal. Compared to general pumps that
It has the advantages that the mechanical seal can be prevented from squealing and water leakage, and that the structure is simple.

[0005]

However, in the above-mentioned conventional magnetic drive pump, since the impeller is driven to rotate only by the uniform magnetic force, it is difficult for the impeller to follow a rapid change in the rotation speed, or the impeller is difficult to follow. There is a drawback that the car is difficult to turn at high speed. If such a pump is used for cooling the engine or the like, the pump will not circulate circulating water or the circulating flow rate will decrease, so that a problem will occur in cooling the engine or the like.

The present invention has been made in view of the above-mentioned conventional circumstances, and the magnetic force is such that the impeller can follow a sudden change in the number of revolutions, and the impeller can rotate reliably at high speed. An object is to provide a drive pump.

[0007]

A magnetically driven pump of the present invention is held rotatably around an axis in a pump chamber and inside the pump chamber, and the rotation causes a fluid to flow in the pump chamber. In a pump having an impeller to be generated and a drive unit which is held by a case and rotationally drives the impeller, the drive unit is provided outside the pump chamber by a partition wall,
To said impeller and said drive unit includes magnetic attraction means for rotating the impeller is provided by mutual magnetic force, the driving portion and the front
Between the cases, there is an interrupting means for interrupting the rotation of the drive unit.
And the disconnecting means is controlled by the control means to rotate the drive part.
It is characterized in that it is configured to intermittently rotate so as to eliminate relative rotation between the drive unit and the impeller. At this time,
The control means is fixed facing the magnetizing means, and
Relative rotation of the impeller and the drive unit input from the means.
When the difference in the number of turns exceeds the permissible range, the connection / disconnection means is connected / disconnected
It is desirable to let The connecting / disconnecting means is an input member.
The driving force input from is intermittently transmitted to the driving unit.
Is desirable. Another form of magnetic drive pump of the present invention
Can be rotated around the shaft center inside the pump chamber.
Function is maintained and the rotation causes the flow of fluid in the pump chamber.
An impeller to be generated and a drive unit for rotationally driving the impeller
In the pump having,
The drive unit and the impeller are provided outside the pump chamber.
And are magnetic attachments that rotate the impeller by mutual magnetic force.
Means are provided, and the magnetizing means of the impeller is a magnet of the drive unit.
Receiving magnetic force from a magnetic induction means other than the attachment means,
The guide means changes the rotation of the impeller by the control means.
Configured to eliminate relative rotation between the drive unit and the impeller
It is characterized by At this time, the magnetic induction means
Is an electric current due to magnetic induction by the magnetic attachment means of the impeller.
Connected to the current generating means to generate, to the current generating means
More preferably, the magnetic force inducing means is activated.

In this pump, since a magnetic force acts between the two magnetizing means, the impeller is rotationally driven by the mutual magnetic force, and a fluid is generated in the pump chamber. And
When there is a sudden change in the number of revolutions or when the impeller is to be rotated at high speed, if relative rotation occurs between the drive unit and the impeller, the control means detects the relative rotation and the drive unit and the magnetic The control signal is output to the wearing means. For this reason, the magnetizing means produces a magnetic force different from the continuous and uniform magnetic force, and its action eliminates the relative rotation.

Further, in this pump, since the drive portion is provided outside the pump chamber by the partition wall, squeaking of the mechanical seal and fluid leakage can be prevented and the structure can be improved as compared with a general pump employing a mechanical seal. Has the advantage of being simple.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 1 to 3 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) In Embodiment 1, as shown in FIG. 1, the means of claim 1 is embodied in a centrifugal magnetic drive type water pump.

That is, in this water pump, the first
The second case 3 is provided on the case 1 via the barrier plate 2 as a partition wall.
Is connected to each other, and a pump chamber 4 communicating with the water jacket of the engine is formed by the first case 1 and the blocking plate 2 and the cylinder block of the engine (not shown). A driven shaft 8 is rotatably held in the first case 1 via a radial plane bearing 5 and thrust plane bearings 6 and 7, and a driven shaft 8 of the thrust plane bearing 6 located between the first case 1 and the blocking plate 2 is supported. A driven permanent magnet 9 as one of the magnetizing means is fixed to the outer peripheral side. The driven permanent magnet 9 is divided in the circumferential direction so that the N poles and the S poles are provided alternately. Further, an impeller 10 as an impeller is fixed to the driven shaft 8 on the pump chamber 4 side, and the impeller 10 is rotatable inside the pump chamber 4 by the rotation of the driven shaft 8.

On the other hand, the shutoff plate 2 and the second case 3 form a crank chamber 11 communicating with the atmosphere, and the second case 3
A drive shaft 13 as a drive unit is rotatably held on the inner peripheral surface of the boss via a radial bearing 12. At the rear end of the drive shaft 13 located in the crank chamber 11, a drive-side permanent magnet 14 serving as the other magnetizing means is fixed. The drive-side permanent magnet 14 is configured with a step so as to face the driven-side permanent magnet 9 in the axial direction and the front side in the axial direction, and is also divided in the circumferential direction into an N pole and an S pole. Are staggered.

Further, on the outer peripheral surface of the boss portion of the second case 3,
A pulley 16 is rotatably held via a radial bearing 15, and a magnetic induction coil 18 is fixed via a fixing member 17. A hub 20 having an armature 19 facing the front end face of the pulley 16 is fixed to the front end of the drive shaft 13 protruding from the second case 3 with a bolt 21. Thus, the pulley 16 and the like constitute the electromagnetic clutch MC, and the pulley 16 is driven by the engine by a belt (not shown).

Further, a rotation sensor 31 facing the driven permanent magnet 9 in the circumferential direction is fixed to the first case 1 and the blocking plate 2, and a second case 3 also faces the driving permanent magnet 14 in the circumferential direction. The rotation sensor 33 is fixed. The rotation sensors 31, 33 and the magnetic induction coil 18 are the CPU 3
Connected to 2. The rotation sensors 31, 33, the magnetic induction coil 18, and the CPU 32 constitute control means.

In this water pump, the electromagnetic clutch M
If the magnetic induction coil 18 is excited by turning on C,
Since the armature 19 is displaced toward the magnetic induction coil 18 and magnetically attached to the pulley 16, the drive shaft 13 rotates integrally with the pulley 16 via the hub 20. During this time, the drive-side permanent magnet 14 exerts a magnetic force on the driven-side permanent magnet 9 in two directions, so that the driven shaft 8 rotates, the impeller 10 is rotationally driven, and a flow of circulating water occurs in the pump chamber 4.

Then, the rotational speed of the drive shaft 13 suddenly fluctuates or the drive shaft 13 rotates at high speed due to fluctuations in the engine speed, turning on the electromagnetic clutch MC while the engine is rotating at high speed, or the like. Drive side permanent magnet 14
Despite the magnetic force between the driven permanent magnet 9 and the driven permanent magnet 9, the driven shaft 8 cannot follow it and the drive shaft 13 and the impeller 10 rotate relative to each other. At this time, the water pump does not circulate the circulating water or the circulating flow rate decreases, which causes a problem in cooling the engine or the like.

Therefore, during this period, the CPU 32 detects the rotation speed of the drive-side permanent magnet 14 by the rotation sensor 33 and also detects the rotation speed of the driven-side permanent magnet 9 by the rotation sensor 31.
Is detected by. Then, the CPU 32 determines whether or not the difference between these rotational speeds exceeds a predetermined allowable range. After that, the CPU 32 outputs a control signal to the magnetic induction coil 18 of the electromagnetic clutch MC when the difference in rotational speed exceeds the allowable range. Therefore, the magnetic induction coil 18 repeats excitation / demagnetization intermittently. As a result, the armature 19 repeats magnetic attraction / separation with respect to the pulley 16, so that the rotation of the drive shaft 13 becomes intermittent. During this period, the drive-side permanent magnet 14 faces the driven-side permanent magnet 9 at different poles, so that a magnetic force different from the uniform magnetic force when the relative rotation occurs. Therefore, relative rotation between the rotation speed of the drive-side permanent magnet 14 and the rotation speed of the driven-side permanent magnet 9 is eliminated.

On the contrary, the CPU 32 continues to excite the magnetic induction coil 18 when the difference in rotation speed is within the allowable range. In this way, the driven shaft 8 follows the drive shaft 13 and the impeller 10 is preferably rotationally driven, so that the flow of circulating water is reliably generated in the pump chamber 4. Therefore, in this water pump, the impeller 10 can follow a sudden change in the rotation speed, and the impeller 10 can reliably operate at high speed.
Can be rotated. Therefore, according to this water pump, the circulating water is reliably circulated, and the engine is cooled appropriately.

Further, in this water pump, the drive shaft 13 is separated from the pump chamber 4 by separating the pump chamber 4 in which the impeller 10 is held from the crank chamber 11 in which the drive shaft 13 is held by the blocking plate 2. Since it is provided outside, compared to a general pump that employs a mechanical seal, it has the advantages that the mechanical seal can be prevented from squeaking and water leakage, and that the structure is simple. Embodiment 2 In Embodiment 2, as shown in FIG. 2, embodying the means of claim 4 to a centrifugal force driven water pump.

That is, in this water pump, the first
A second case 43 is coupled to the case 41 via a blocking plate 42, and a pump chamber 44 is formed by the first case 41, the blocking plate 42, and the cylinder block. First
A driven shaft 48 is rotatably held in the case 41 via a radial plane bearing 45 and thrust plane bearings 46 and 47, and an outer peripheral side of the thrust plane bearing 46 located between the first case 41 and the blocking plate 42. A driven permanent magnet 49 is fixed to the. An impeller 50 is fixed to the driven shaft 48 on the pump chamber 44 side.

On the other hand, a crank chamber 51 is formed by the blocking plate 42 and the second case 43, and a drive shaft 52 is formed on the inner peripheral surface of the boss portion of the second case 43 via a radial bearing (not shown).
Is rotatably held. A drive-side permanent magnet 53 is fixed to the rear end of the drive shaft 52 located in the crank chamber 51. In addition, the drive shaft 5 protruding from the second case 43
A pulley 54, which is driven by the engine by a belt (not shown), is fixed to the front end of 2.

Further, a magnetic induction coil 61, which faces the driven permanent magnet 49 in the circumferential direction and is divided in the circumferential direction, is fixed to the outer peripheral surface of the first case 41, and the driving side permanent magnet is attached to the second case 43. A rotation sensor 62 that faces 53 in the circumferential direction is fixed. A water temperature sensor 63 is provided upstream of the radiator that communicates with the water jacket. The magnetic induction coil 61, the rotation sensor 62, and the water temperature sensor 63 are connected to the CPU 64, and the rotation sensor 6
2. The water temperature sensor 63 and the CPU 64 constitute a control means. Other configurations are similar to those of the first embodiment.

In this water pump, the drive shaft 52 is rotated by the pulley 54, and the drive-side permanent magnet 53 exerts a magnetic force on the driven-side permanent magnet 49 in two directions, whereby the driven shaft 48 is rotated and the impeller 50 is rotated. The water is rotatably driven to generate a flow of circulating water in the pump chamber 44. Then, when the rotational speed of the drive shaft 52 suddenly changes or the drive shaft 52 rotates at a high speed, the driven shaft 48 cannot follow it, and relative rotation occurs between the drive shaft 52 and the impeller 50. At this time, since the water pump does not circulate the circulating water or the circulating flow rate decreases, the temperature of the circulating water rises upstream of the radiator.

Therefore, during this time, the CPU 64 detects the temperature of the circulating water upstream of the radiator by the water temperature sensor 63 and the rotation speed of the drive side permanent magnet 53 by the rotation sensor 62. Then, the CPU 64 determines whether or not the temperature of the circulating water detected by the water temperature sensor 63 exceeds a predetermined allowable range, even though the rotation sensor 62 detects the rotation of the drive side permanent magnet 53. To do. After that, the CPU 64 outputs a control signal to the magnetic induction coil 61 when the temperature of the circulating water exceeds the allowable range while the drive side permanent magnet 53 is rotating. Therefore, the magnetic induction coil 61 repeats positive and negative excitation in a cycle adapted to the rotation speed of the drive shaft 52. As a result, the driven permanent magnet 49 receives a magnetic force stronger than the uniform magnetic force when the relative rotation occurs, so that the relative rotation between the rotation speed of the driving side permanent magnet 53 and the rotation speed of the driven side permanent magnet 49 is eliminated. Be done. In this way, the driven shaft 48 follows the drive shaft 52, so that the impeller 50 is preferably rotationally driven to circulate the circulating water satisfactorily, and the engine is cooled appropriately. Other actions are similar to those of the first embodiment.

Therefore, also in this water pump, the same effect as that of the first embodiment can be obtained. Further, in this water pump, the rotation speed of the impeller 50 can be controlled according to the temperature of the circulating water. That is, if the temperature of the circulating water detected by the water temperature sensor 63 is below a predetermined allowable range, the CPU 64 outputs a control signal to the magnetic induction coil 61. Therefore, the magnetic induction coil 61 does not repeat positive and negative excitation or repeats positive and negative excitation in a slow cycle according to the negative temperature difference. As a result, even if the drive shaft 52 rotates at high speed, the impeller 50 stops rotating or rotates at low speed. Therefore, the amount of water circulating in the water jacket is reduced, the engine is prevented from being excessively cooled, the engine is appropriately warmed, and proper combustion is performed.

On the contrary, if the temperature of the circulating water detected by the water temperature sensor 63 is above the predetermined allowable range, CP
U64 outputs a control signal to the magnetic induction coil 61.
For this reason, the magnetic induction coil 61 responds to the positive temperature difference by
Positive and negative excitation is repeated in an early cycle. This causes the engine to cool rapidly and still provide good combustion. Embodiment 3 In Embodiment 3, as shown in FIG. 3, embodying the means of claim 5 in a centrifugal force driven water pump.

That is, in this water pump, the second
A current generating coil 65, which faces the drive side permanent magnet 53 in the circumferential direction and is divided in the circumferential direction, is fixed to the outer circumferential surface of the case 43. Current generating coil 65, magnetic induction coil 61,
The rotation sensor 62 and the water temperature sensor 63 are connected to the CPU 66. These current generation coil 65, magnetic induction coil 61, rotation sensor 62, water temperature sensor 63, and CPU 6
6 constitutes a control means. Other configurations are similar to those of the second embodiment.

In this water pump, the current generating coil 65 generates a current while the drive side permanent magnet 53 is rotating. Therefore, when relative rotation occurs between the drive shaft 52 and the impeller 50, the CPU 66 energizes the magnetic induction coil 61 with the current generated by the current generation coil 65,
The magnetic induction coil 61 is made to repeat positive and negative excitation. As a result, the rotational speed of the drive-side permanent magnet 53 and the driven-side permanent magnet 4
Relative rotation with respect to the rotation speed of 9 is eliminated, and the impeller 50 is rotatably driven. Other actions are similar to those of the second embodiment.

Therefore, also in this water pump, the same effect as that of the second embodiment can be obtained. Further, in this water pump, since the electric power for exciting the magnetic induction coil 61 can be obtained by the current generating coil 65, the other electric power can be minimized, which is economical.

[0030]

As described above in detail, since the magnetic drive pump of the present invention employs the means described in each claim , the impeller can follow a rapid change in the rotation speed. ,
Moreover, the impeller can be reliably rotated at high speed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a centrifugal magnetic drive type water pump according to a first embodiment.

FIG. 2 is a vertical cross-sectional view of a centrifugal magnetic force driven water pump according to a second embodiment.

FIG. 3 is a vertical cross-sectional view of a centrifugal magnetic force driven water pump according to a third embodiment.

[Explanation of symbols]

4, 44 ... Pump chamber 10, 50 ... Impeller (impeller) 13, 52 ... Drive unit (driving shaft) 11, 51 ... Crank chamber 14, 53 ... Magnetizing means (driving side permanent magnet) 9, 49 ... Magnetizing Means (following permanent magnet) 31, 33, 62, 32, 64, 66, 18, 61, 6
3, 65 ... Control means (31, 33, 62 ... Rotation sensor,
32, 64, 66 ... CPU, 18, 61 ... Magnetic induction coil, 63 ... Water temperature sensor, 65 ... Current generating coil 2, 42 ... Partition wall (blocking plate)

Continuation of the front page (56) References JP-A-5-252800 (JP, A) SAIKAI Sho 60-159899 (JP, U) SEIKO 4-52480 (JP, Y2) (58) Fields investigated (Int .Cl. ⁷ , DB name) F04D 13/02 F04D 15/00 F16H 49/00

Claims (5)

(57) [Claims] 1. A pump chamber, an impeller that is rotatably held about an axis inside the pump chamber, and causes a fluid flow in the pump chamber by the rotation, and an impeller that is held by a case. And a drive unit that rotationally drives the drive unit, the drive unit being provided outside the pump chamber by a partition wall, and the drive unit and the impeller rotationally drive the impeller by mutual magnetic force. The magnetic unit is provided, and the drive unit
Between the case and the case is an intermittent hand for intermittently rotating the drive unit.
A step is arranged and the interrupting means is controlled by the control means
A magnetic drive pump, characterized in that it is configured to intermittently rotate the drive unit to eliminate relative rotation between the drive unit and the impeller. 2. The control means faces the magnetizing means.
The impeller, which is fixed and is input from the magnetizing means, and the
When the difference in the relative speed with the drive unit exceeds the allowable range,
The magnetic force-driven pond according to claim 1, wherein the intermittent means is intermittent.
Pu. 3. The connecting / disconnecting means is input from an input member.
The driving force is intermittently transmitted to the driving unit, or
2. The magnetic drive pump described in 2. 4. A pump chamber and a shaft center around the inside of the pump chamber.
Rotatably held in the pump chamber by the rotation.
The impeller that causes a flow in the air, and rotationally drives the impeller
In a pump having a drive unit, The drive unit is provided outside the pump chamber by a partition wall.
The driving unit and the impeller are
A magnetic attachment means for driving the impeller to rotate is provided.
The magnetic attraction means is a magnetic induction means different from the magnetic attraction means of the drive section.
Receives magnetic force from the magnetic induction means and the magnetic induction means is controlled by the control means
By changing the rotation of the impeller, the drive unit and the impeller are changed.
Characterized by being configured to eliminate relative rotation with
Magnetic drive pump. 5. The magnetic guide means is a magnetic handle of the impeller.
For current generation means that generates current by magnetic induction by steps
Is connected, and the magnetic force inducing means is connected by the current generating means.
The magnetic drive pump according to claim 4, which is operated.