JP2008138656A - Magnetic drive pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic drive pump capable of shortening a time required for raising a coolant temperature by reducing a coolant flow during the cold start of an engine, and improving fuel economy by reducing the coolant flow to reduce the workload of a pump. <P>SOLUTION: There is provided a drive means 23 for moving either of a permanent magnet (magnetizing means) 20 and an inductor 18 in the axial direction of a rotating shaft 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic drive pump that rotationally drives an impeller with a magnetic force, and is particularly suitable for use in an engine water pump.

As a conventional magnetically driven pump, an impeller (11) that is rotatably held in a pump chamber (8) and causes a fluid to flow in the pump chamber (8) by the rotation, and an impeller (11) A drive mechanism (50) for rotational drive, and the drive mechanism (50) is rotatably arranged on the outside (9) from a partition wall (10) separating the pump chamber (8) and the outside (9). The permanent magnet (4) integrally fixed to (6) and the induction composed of a conductor that is fixed to the impeller (11) and that rotates with the induced current generated by the rotation of the permanent magnet (4) as a power source. There is a water pump composed of a child (7). (For example, see Patent Document 1)
In this water pump, the flow rate of cooling water (the amount of work of the pump) increases nonlinearly with the engine speed, so that the amount of work at high rotation can be set appropriately. However, in an engine operation area that does not require a circulating amount of cooling water, such as in the middle rotation area, when the engine is cold, or during low-load steady operation, the cooling water is circulated more than necessary, and engine warm-up deteriorates and is wasted. It contributes to the deterioration of fuel consumption due to work.
JP 2005-139917 A

  The present invention has been made in view of the above-described problems, and can reduce the cooling water flow rate when the engine is cold to shorten the rise time of the cooling water temperature and reduce the cooling water flow rate to reduce the pump. It is an object of the present invention to provide a magnetically driven pump that can reduce the amount of work and improve fuel efficiency.

The first technical measure taken to solve the above problems is as follows:
A pump chamber having a suction port and a discharge port, a partition separating the pump chamber and the outside, a rotating shaft disposed on the pump chamber side of the partition, and a bearing at one end of the rotating shaft And an impeller that is rotatably supported, an inductor that is fixed and rotated integrally with the impeller, and is rotatably supported by being disposed at a position facing the inductor outside in a radial direction of the partition wall. In a magnetic drive pump comprising a magnetic attachment means and a rotation drive means fixed integrally with the magnetic attachment means,
Drive means for moving at least one of the magnetizing means and the inductor in the axial direction of the rotating shaft is provided.

The second technical means is the first technical means,
The drive means is constituted by a sealed space whose volume changes with a change in internal pressure.

The third technical means is the first and second technical means,
The driving means is operated by pressure.

The fourth technical means is the first and second technical means,
The driving means is operated by a negative pressure of a negative pressure pump.

The fifth technical means is the first technical means to the fourth technical means,
The discharge amount is controlled by the operation-non-operation time distribution per unit time of the driving means.

The sixth technical means is the first technical means,
The driving means includes a temperature-sensitive driving member that is disposed inside the rotating shaft and expands and contracts depending on the temperature of the cooling water.

The seventh technical means is the sixth technical means,
The temperature-sensitive driving member includes a thermally responsive member and an elastic member.

  According to the invention of claim 1, the magnetic drive means and the inductor are provided by the drive means for moving at least one of the magnetic attachment means and the inductor in the axial direction of the rotating shaft in the magnetic drive type water pump. The magnetic force generated between the two can be controlled. That is, when the temperature of the cooling water is low and the engine is cold, the magnetic force generated between the magnetizing means and the inductor is reduced to reduce the rotation speed of the impeller that rotates integrally with the inductor, and the flow rate of the cooling water is reduced. By reducing it, the rise time of the cooling water temperature can be shortened, and the engine load can be reduced to improve fuel efficiency.

  According to the second aspect of the present invention, since the driving means is formed of a sealed space whose volume changes due to a change in internal pressure, at least one of the magnetizing means and the inductor can be moved with a simple configuration. The magnetic force generated between the magnetizing means and the inductor can be controlled.

  According to the third aspect of the present invention, the driving means is operated by pressure, so that one of the magnetizing means and the inductor can be moved at a negative pressure, and the magnetic force generated between the magnetizing means and the inductor. Can be controlled.

  According to the fourth aspect of the present invention, the drive means is operated by the negative pressure of the negative pressure pump, so that the arrangement of the negative pressure pump as the negative pressure source in the engine room is flexible.

  According to the fifth aspect of the present invention, the discharge amount is controlled by the time distribution of operation / non-operation per unit time of the driving means, so that the optimal discharge amount can be controlled according to the warm-up state and load state of the engine.

  According to the sixth aspect of the present invention, the driving means has the temperature-sensitive driving member that is disposed inside the rotating shaft and expands and contracts depending on the temperature of the cooling water, whereby the flow rate of the cooling water can be controlled by the cooling water temperature.

  According to the seventh aspect of the present invention, the temperature sensitive driving member includes the heat responsive member and the elastic member, so that the flow rate of the cooling water can be controlled with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 shows a water pump (magnetic drive pump) 100 showing a first embodiment of the present invention. The water pump 100 is fixed to the engine block 9 by fastening means (not shown).

  The water pump 100 mainly includes a suction port 7 and a discharge port 8 formed in the engine block 9, a body 110 defining a pump chamber 10 by covering a recess 9 a formed in the engine block 9, and a pump chamber 10. The impeller 15 is rotatably held inside the pump chamber 10 and causes the cooling water to flow in the pump chamber 10 by the rotation, and the drive mechanism 50 that rotationally drives the impeller 15.

  A rotating shaft 13 is fixed to a nonmagnetic partition wall 12 that separates the pump chamber 10 and the outside 11 formed in the engine block 9. An impeller 15 is rotatably supported on the rotary shaft 13. A core 16 made of a laminated plate is integrally fixed on the back surface of the impeller 15 to form an inductor 18 together with a guide ring 17. Permanent magnets (magnetizing means) 20 are disposed on the radially outer side of the inductor 18 at positions facing each other across the partition wall 12. The permanent magnet 20 is divided in the circumferential direction, and N poles and S poles are provided alternately.

  The permanent magnet 20 is fixed to the inner periphery of a ring-shaped yoke 26 made of a magnetic material, and is integrated with a dish-shaped diaphragm 19 made of a non-magnetic material having a shaft portion at the center. The diaphragm 19 is held in the outer cylinder 21 so as to be slidable in the axial direction. The diaphragm 19 and the outer cylinder 21 are kept airtight by the seal member 22 disposed on the sliding surface of the yoke 26. A closed space (driving means) 23 is formed.

  A stopper 14 made of a magnetic material is fixed to the open end of the outer cylinder 21 on the impeller 15 side in order to restrict the axial position of the permanent magnet 20. A yoke 26 abuts against the stopper 14 to restrict the axial position of the permanent magnet 20. When the yoke 26 is in contact with the stopper 14, the axial center 16 a of the core 16 is eccentric by a predetermined amount from the axial center 20 a of the permanent magnet 20 toward the impeller 15.

  The outer cylinder 21 has a one-stage small diameter on the opposite side of the impeller 15 to form a shaft portion, and a pulley (rotation drive means) 24 is integrally fixed. Further, a negative pressure connector 25 is disposed at the end of the shaft portion having a small diameter via a bearing 27 having airtightness, and a negative pressure pump 42 which is a negative pressure source is connected via a negative pressure control valve 41. It is connected. The intake negative pressure of the engine may be used as a negative pressure source.

  Next, the operation will be described.

  The upper side of FIG. 1 shows a state where no negative pressure is applied to the sealed space 23, and the lower side shows a state where negative pressure is applied.

  In a state where no negative pressure is applied, the axial center 16a of the core 16 is eccentric by a predetermined amount from the axial center 20a of the permanent magnet 20 toward the impeller 15, so that the permanent magnet 20 is moved toward the core 16 by magnetic force. The yoke 26 is in contact with the stopper 14 by being biased by suction. Since both the stopper 14 and the yoke 16 are magnetic bodies, they are attracted to each other by magnetic force.

  When the rotational driving force from the engine is transmitted by a belt (not shown) and the pulley 24 is rotated, the outer cylinder 21 and the diaphragm 19 rotate together, and the permanent magnet 20 disposed on the inner peripheral surface of the diaphragm 19. And the direction of the magnetic flux between the inductor 18 changes. In the upper state of FIG. 1 in which no negative pressure is applied to the sealed space 23, the amount of magnetic flux acting between the permanent magnet 20 disposed on the inner peripheral surface of the diaphragm 19 and the inductor 18 is maximum, and the magnetic flux The induction current generated in the inductor 18 by the change of the direction becomes the maximum, the magnetic force becomes the maximum, and the transmission torque by the magnetic induction becomes the maximum. That is, the rotational force of the impeller 15 is maximized and the pump discharge capacity is maximized.

  On the other hand, in the lower state of FIG. 1 in which negative pressure is applied to the sealed space 23, the diaphragm 19 is sucked in the direction away from the inductor 18 in the axial direction, so that it is disposed on the inner peripheral surface of the diaphragm 19. The amount of magnetic flux acting between the permanent magnet 20 and the inductor 18 is minimal, the induced current generated in the inductor 18 is reduced due to the change in the direction of the magnetic flux, the magnetic force is reduced, and the transmission torque due to magnetic induction is reduced. Decrease. That is, the rotational force of the impeller 15 is reduced and the pump discharge capacity is reduced.

  When the negative pressure is released from the lower side of FIG. 1 where the negative pressure is applied to the sealed space 23, the permanent magnet 20 and the core 16 attract each other by magnetic force, and the negative pressure is applied to the sealed space 23. The upper side of FIG. 1 not applied is in a state. As shown in FIG. 2, a spring 28 that supplements the attractive force between the permanent magnet 20 and the core 16 and biases the diaphragm 19 toward the impeller 15 may be disposed in the sealed space 23.

  When cooling performance is required, such as when the engine is heavily loaded or when the cooling water temperature is high, the pump discharge capacity is maximized without applying negative pressure to the sealed space 23. When the temperature is low, a negative pressure is applied to the sealed space 23 to move the diaphragm 19 in the axial direction, thereby reducing the excessive cooling water flow rate and reducing the driving force.

  In this way, the engine control computer outputs a control signal to the negative pressure control valve to control the negative pressure based on the engine speed, cooling water temperature, and throttle opening, and the cooling water flow rate is always optimized to the minimum necessary. Control.

  Or, instead of controlling the negative pressure itself, the negative pressure control valve is repeatedly operated (ON time) and inactive (OFF time) within an arbitrary period according to the required flow rate, and the average flow rate within the set time is calculated. You may control. FIG. 4 shows an example. For example, by setting the ON time to 30%, 50%, and 80% of the set time in a cycle of 5 to 10 seconds, the average flow rate within the set time is set to 30% with respect to the maximum flow rate. %, 50%, and 80%.

  In this way, when the engine is cold, the amount of cooling water can be reduced to achieve early warm-up, and at the same time, wasteful power can be reduced and fuel efficiency can be improved.

<Second Embodiment>
FIG. 3 shows a water pump (magnetic drive pump) 200 showing a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  A cylindrical shaft 30 is fixed to a nonmagnetic partition wall 12 that separates the pump chamber 10 and the outside 11 formed in the engine block 9. Inside the shaft 30, there is slidably disposed a slider 31 which encloses a thermo wax (driving means) 32 as a temperature sensitive member and slidably holds a rod 33 therein. A rotating shaft 133 is disposed on the outer periphery of the shaft 30 so as to be slidable in the axial direction, and the impeller 15 is rotatably supported by the rotating shaft 133 via a bearing 14. A coil spring 34 disposed at the end of the shaft 30 urges the rotating shaft 133 in a direction away from the tip of the shaft 30. When the thermowax 32 expands, the slider 31 is pushed in the axial direction by the rod 33 in contact with the partition wall 12, and the rotary shaft 133 is pushed in the axial direction by the pin 35 protruding in the radial direction from the slider 31. It has become.

  A core 16 made of a laminated plate is integrally fixed on the outer periphery of the rear shaft portion 15 a of the impeller 15 to form an inductor 18 together with the guide ring 17. A permanent magnet (magnetizing means) 20 is disposed on the inner peripheral surface of the bottomed cylindrical outer cylinder 211 with the partition wall 12 therebetween on the radially outer side of the inductor 18. The outer cylinder 211 forms a shaft portion whose bottom portion has a smaller diameter, and a pulley (rotation drive means) 24 is integrally fixed.

  Next, the operation will be described.

  The upper side of FIG. 2 shows a state where the cooling water temperature is high, and the lower side shows a state where the cooling water temperature is low.

  When the rotational driving force from the engine is transmitted by a belt (not shown) and the pulley 24 is rotated, the outer cylinder 211 rotates, and between the permanent magnet 20 disposed on the inner peripheral surface of the outer cylinder 211 and the inductor 18. The direction of the magnetic flux changes.

  In a state where the cooling water temperature is low, the thermo wax 32 is contracted, so that the slider 31 is positioned on the pulley 24 side. Since the rotary shaft 133 is also urged toward the pulley 24 by the coil spring 34, the amount of magnetic flux acting between the permanent magnet 20 and the inductor 18 due to the positional relationship between the inductor 18 and the permanent magnet 20 is different. At a minimum, the induced current generated in the inductor 18 due to the change in the direction of magnetic flux is reduced, and the transmission torque due to magnetic induction is reduced. That is, the rotational force of the impeller 15 is reduced and the pump discharge capacity is reduced. Further, since the distance d between the tip of the impeller 15 and the body 9 is separated, the discharge amount of the pump 200 is further reduced, the cooling water flow rate is reduced, and the engine is warmed up early.

  When the engine is warmed up and the coolant temperature rises, the thermowax 32 expands and the slider 31 moves to the body 9 side. The pin 35 protruding in the radial direction from the slider 31 pushes the rotating shaft 133 toward the body 9 in the axial direction against the urging force of the coil spring 34, so that the inductor 18 also moves together with the rotating shaft 133 and becomes a permanent magnet. 20 and a position facing. Then, the amount of magnetic flux acting between the inductor 18 and the permanent magnet 20 is the maximum, the induced current generated in the inductor 18 due to the change in the direction of the magnetic flux is maximized, the magnetic force is maximized, and transmission by magnetic induction is performed. Torque is maximized. At the same time, the distance d between the tip of the impeller 15 and the body 9 is also a minimum gap, and the discharge amount of the pump 200 is maximized, so that the engine can be suitably cooled with a sufficient cooling water flow rate.

It is a sectional view showing a 1st embodiment concerning the present invention. It is sectional drawing showing the modification of 1st Embodiment which concerns on this invention. It is sectional drawing showing the modification of the 2nd Embodiment which concerns on this invention. It is a figure showing an example of the operation pattern of a 1st embodiment concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, 200 ... Water pump 7 ... Intake port 8 ... Discharge port 10 ... Pump chamber 12 ... Partition 13, 133 ... Rotating shaft 14 ... Bearing 15 ... Impeller 18 ... Inductor 20 ... Permanent magnet (magnetization means)
23 ... Sealed space (drive means)
24... Pulley (rotation drive means)
26 ... Spring 31 ... Slider 32 ... Thermo wax (drive means)
33 ... Rod

Claims (7)

A pump chamber having a suction port and a discharge port;
A partition wall separating the pump chamber and the outside;
A rotating shaft disposed on the pump chamber side of the partition;
An impeller rotatably supported at one end of the rotating shaft;
An inductor that is integrally fixed with the impeller and rotates;
Magnetic attachment means disposed rotatably at a position facing the inductor outside in the radial direction of the partition wall and rotatably supported;
Rotation driving means fixed to the magnetizing means and driving the magnetizing means to rotate;
In a magnetically driven pump with
A magnetic drive pump characterized by comprising a drive means for moving at least one of the magnetizing means and the inductor in the axial direction of the rotating shaft. In claim 1,
The magnetic drive pump characterized in that the drive means is constituted by a sealed space whose volume changes with a change in internal pressure. In claims 1 and 2,
The magnetic drive pump characterized in that the driving means is operated by pressure. In claims 1 and 2,
The drive means is operated by the negative pressure of a negative pressure pump. In claims 1 to 4,
2. A magnetic drive pump according to claim 1, wherein a discharge amount is controlled by an operation-non-operation time distribution per unit time of the drive means. In claim 1,
The magnetic drive pump characterized in that the drive means has a temperature-sensitive drive member that is disposed inside the rotating shaft and expands and contracts depending on the temperature of the cooling water. In claim 6,
The temperature-sensitive drive member has a heat-responsive member and an elastic member, and is a magnetic drive pump.

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