JP2005139917A - Magnetic drive pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic drive pump to follow rotation of an engine without loss of synchronism during high speed rotation of an engine, and decreased in size. <P>SOLUTION: The pump comprises a pump chamber 8; an impeller 11 held rotatably at the internal part of the pump chamber 8 and making fluid generate a flow in the pump chamber 8 by its rotation; and a drive mechanism 50 to rotationally drive the impeller 11. The drive mechanism 50 consists of a permanent magnet 4 integrally fixed at a drive magnet 6 rotatably disposed at an external part (the atmosphere) 9 more externally than a partition wall 10 for separating a pump chamber 8 and the external part (the atmosphere) 9 from each other; and an inductor 7 consisting of a conduction element rotated by an induced current as a power source, generated by rotation of a permanent magnet 4 integrally fixed at the impeller 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetic drive pump that rotationally drives an impeller with a magnetic force. This pump can be used as a water pump or the like.

In the conventional water pump, the outside (atmosphere) and the pump chamber are separated by the mechanical seal, but the friction of the mechanical seal is large, which causes the fuel consumption to deteriorate. On the other hand, there is one in which the rotational force from the engine is transmitted to the impeller of the engine cooling water pump without contact by a magnetic coupling formed by magnets facing each other with a partition wall separating the pump chamber from the outside. (For example, refer to Patent Document 1). However, this water pump is a type in which the pump chamber is sealed to the outside with a partition wall, and friction is reduced. However, when the torque for driving the impeller exceeds the transmission torque of the magnetic coupling at the time of engine high speed rotation, Despite the rotation of the impeller, a step-out state occurs in which the impeller stops rotating. Since step-out immediately leads to overheating of the engine, in order to avoid this, it is necessary to increase the capacity of the magnetic coupling. Further, considering the demagnetization due to the temperature rise and the follow-up to engine rotation fluctuation, there is a problem that the capacity of the magnetic coupling becomes larger.
Japanese Patent Laid-Open No. 10-089069

  SUMMARY OF THE INVENTION Accordingly, it is a technical object of the present invention to reduce the size of a magnetically driven pump while following the rotation of the engine without stepping out during high-speed rotation of the engine.

  In order to solve the above technical problem, the technical means taken in the invention of claim 1 is a pump chamber and is held rotatably inside the pump chamber, and flows to the fluid in the pump chamber by the rotation. And a drive mechanism that rotationally drives the impeller. The drive mechanism is integrated with a drive member that is rotatably arranged outside the partition that separates the pump chamber and the outside. And an inductor made of an electric conductor that is integrally fixed to the impeller and that rotates using an induced current generated by rotation of the magnetizing means as a power source.

  According to the above-described means, the drive mechanism is integrally fixed to the impeller and the magnetic attachment means fixed integrally to the drive member that is rotatably arranged outside the partition wall separating the pump chamber and the outside. By comprising an inductor made of an electric conductor that rotates using an induced current generated by rotation of the magnetizing means as a power source, the rotation is transmitted in a non-contact manner and the friction is reduced. Further, it is possible to follow the rotation of the engine without stepping out at the time of high-speed rotation of the engine and to reduce the size. Further, since the inductor is arranged in the pump chamber, it is cooled when the inductor generates heat.

  According to the present invention, the drive mechanism includes a magnetic attachment means that is integrally fixed to a drive member that is rotatably disposed outside by a partition wall that separates the pump chamber and the outside, and a magnetic mechanism that is integrally fixed to the impeller. By comprising an inductor made of an electric conductor that rotates using an induced current generated by the rotation of the landing means as a power source, the rotation is transmitted in a non-contact manner and the friction is reduced. Further, it is possible to follow the rotation of the engine without stepping out at the time of high-speed rotation of the engine and to reduce the size. Further, since the inductor is arranged in the pump chamber, it is cooled when the inductor generates heat.

  An embodiment according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a water pump (magnetic drive pump) 100 showing an embodiment of the present invention. The water pump 100 is fixed to an engine block (which may be a timing chain case or the like) 110 by fastening means (not shown).

  A water pump (magnetically driven pump) 100 mainly covers a recess 110a formed in the engine block 110 to define a pump chamber 8 and is rotatably held inside the pump chamber 8 to rotate. Thus, the impeller 11 that causes a flow of cooling water (fluid) in the pump chamber 8 and the drive mechanism 50 that rotationally drives the impeller 11 are configured.

  The body 2 is liquid-tightly fixed to the engine block 110 via an O-ring (for example, a gasket) 120 by fastening means (not shown). A shaft 3 is rotatably held on the body 2 via a bearing 1. A pulley seat 130 is fixed to one end of the shaft 3 to transmit a rotational driving force from the engine, and a drive magnet (drive) integrally provided with a bracket 5 to which a permanent magnet (magnetization means) 4 is fixed to the other end. Member) 6 is fixed. The drive magnet 6 is rotatably arranged between the body 2, a pump chamber fixed to the pump chamber 8 side of the body 2, and a partition wall 10 that separates the outside (atmosphere) 9. The permanent magnet 4 is divided in the circumferential direction, and N poles and S poles are provided alternately. The partition wall 10 is liquid-tightly fixed to the body 2 via an O-ring (which may be a gasket or the like) 140.

  The inductor 7 is fixed to the fixing member 7 a and is disposed so as to face the drive magnet 6 through the partition wall 10. The inductor 7 is made of an electric conductor that rotates using an induced current generated by the rotation of the permanent magnet 4 as a power source. The fixing member 7 a is fixed to one end of the rotating member 14, and the impeller 11 is fixed to the other end side of the rotating member 14. The rotating member 14 is rotatably supported via an underwater bearing 12 on a shaft 13 having one end fixed to the partition wall 10 and the other end fixed to the engine block. A drive mechanism 50 is constituted by the inductor 7 and the permanent magnet 4.

  Next, the operation of this embodiment will be described.

  When the shaft 3 is rotated via the pulley seat 130 by the rotational driving force from the engine, the permanent magnet 4 integrated with the shaft 3 is rotated. With the rotation of the permanent magnet 4, an induced current is generated in the inductor 7 facing the permanent magnet 4 through the partition wall 10. The inductor 7 is rotated in the same direction as the rotation direction of the permanent magnet 4 by the induced current of the inductor 7 and the magnetic flux of the permanent magnet 4. With the rotation of the inductor 7, the rotating member 14 integrated with the inductor 7 is rotated, and the impeller 11 integrated with the rotating member 14 is rotated, thereby causing a flow of cooling water in the pump chamber 8.

  At this time, the transmission of the rotational torque by the induced current allows the slip (rotational difference) between the permanent magnet 4 and the inductor 7, so that the rotation of the inductor 7 is performed even though the permanent magnet 4 is rotating. There is no step-out condition to stop. For this reason, the magnetic force of the permanent magnet 4 does not need to have an excessive magnetic force, and may be a small or low magnetic force. In addition, as shown in FIG. 2, due to slippage (rotational difference), a large amount of cooling water can be sent in the low speed range to improve the performance of the heater device for the passenger compartment. This prevents the loss of driving force.

It is a longitudinal section of water pump 100 concerning an embodiment of the invention. It is explanatory drawing which shows the effect | action of the water pump 100 concerning embodiment of this invention.

Explanation of symbols

4 ... Permanent magnet (magnetization means)
6 ... Drive magnet 7 ... Inductor 8 ... Pump chamber 9 ... External (atmosphere)
DESCRIPTION OF SYMBOLS 10 ... Partition 11 ... Impeller 50 ... Drive mechanism

Claims (1)

A pump room,
An impeller that is rotatably held inside the pump chamber, and causes the fluid to flow in the pump chamber by the rotation;
In a pump comprising a drive mechanism that rotationally drives the impeller,
The drive mechanism is integrally fixed to a drive member that is rotatably disposed outside the partition wall that separates the pump chamber from the outside, and is fixed to the impeller integrally. A magnetic drive pump characterized by comprising an inductor made of an electric conductor that rotates using an induced current generated by rotation of the means as a power source.

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