JPS5828467Y2 - Reciprocating drive device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating drive device that converts electrical energy used in pumps, vibrating equipment, etc. into reciprocating kinetic energy by electromagnetic action.

Conventionally, there is a device that uses a combination of an electromagnetic coil and a permanent magnet to drive one of them back and forth as a mover, but there are many devices in which the mover is formed by an electromagnetic coil.

However, this type of reciprocating drive device has drawbacks such as a complicated configuration of the power feeding section, the inability to increase the gap length of the magnetic circuit, the capacity must be controlled, and poor durability.

For this reason, reciprocating drive devices that use permanent magnets as movers are increasingly attracting attention.

In this case, if an alternating current or a pulse current is applied to the electromagnetic coil fitted on the stator side, the mover moves back and forth due to electromagnetic attraction and repulsion. The stroke affects the process accuracy of the yoke.

Furthermore, when using a 50Hz or 60Hz commercial power source, the stroke driving force is greatly affected by the frequency. For example, when it is installed as an air pump, variations in air volume and wind pressure appear, and this is caused by adjustments and rework for uniformity. It has disadvantages such as reduced productivity and unstable quality.

The object of the present invention is to provide a reciprocating drive device with stable performance by providing a mechanical fine adjustment mechanism to solve the above-mentioned drawbacks and suppressing variations in individual parts due to manufacturing.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

In the figure, reference numeral 1 denotes a yoke, which is formed of a ferromagnetic material into a hollow cylindrical shape with a longitudinal cross-sectional end face approximately E-shaped.

As shown in the figure, the yoke 1 is integrated with a ring-shaped center yoke 1b, which is held between an end yoke 1a having an L-shaped end face in longitudinal section.

Note that the joint between the two is an inko joint, and the center yoke 1b
A gap 1c is provided between both end yokes 1a, Ia so that the yokes can be moved slightly in the axial direction.

A bolt 8 is screwed into the center yoke 1b, passes through the yoke 1a, and a nut 9 is fitted at the end to join the yokes 1a and 1b together.

Reference numeral 2 denotes a hollow coil to which electromagnetic action is to be applied, which is disposed in the yoke 1a so that the same polarity occurs in adjacent parts, is electrically connected to an external power source, and is connected to an alternating current or pulsed current. can be supplied.

A movable element 3 is provided in the hollow part of the yoke 1 so as to be freely slidable in the axial direction.

The mover 3 is formed by fixing magnetic pole pieces 10 to both ends of a permanent magnet 4 having N and S magnetic poles magnetized in the axial direction.

A shaft 7 is fixed to the end of the movable element 3 and supported by a bearing 6 provided on an end plate 5 attached to the end of the yoke 1.

Next, the operation of the above configuration will be explained.

First, when an alternating current or a pulse current is supplied to the coil 2, the movable element 3 reciprocates in the axial direction due to the electromagnetic attraction effect that acts between the permanent magnet 4 and the yoke 1 forming the movable element 3.

At this time, depending on the distance between the center yoke 1b and the end yoke 1a, or the length of the permanent magnet 4 of the mover 3 and the pole width of the magnetic pole pieces 10 at both ends, the distance between the magnetic poles of the yoke 1 and the magnetic pole of the mover 3 is determined. If there is manufacturing variation in the relative position between the poles of the piece 10, this deviation will appear as variation in the stroke and driving force of the movable element 3.

However, since the center yoke 1b forming the yoke 1 is threaded with the bolt 8 and is movable in the axial direction with respect to the end yoke 1a, the distance from the end yoke 1a can be finely adjusted.

Therefore, in addition to absorbing variations during component manufacturing as described above and adjusting when the external loads are different on the left and right sides, it is possible to adjust or change the stroke and driving force of the movable element 3.

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIG.

In FIG. 2, a yoke 1 is constructed by integrating a center yoke 1d having a generally T-shaped vertical cross-sectional end face and an end yoke 1e having a substantially T-shaped vertical cross-sectional end face using a screw 12.

A screw 11 is further screwed into the end yoke 1e, and the tip of the screw 11 comes into contact with the end surface of the center yoke 1d.

By rotating the screw 11, the end yoke 1e
is movable in the axial direction with respect to the center yoke 1d, and the same adjustment effect as in the previous embodiment is possible.

In this embodiment, permanent magnets magnetized in the axial direction were used as the permanent magnets constituting the mover, but as shown in FIG. The same thing can be done by fixing N and S poles on the outer periphery of the N and S poles, fixing cylindrical magnetic pole pieces 15 to each, and fixing them to the sliding shaft 7 through side plates 16 made of non-magnetic material. It exhibits the effect of

The reciprocating drive device of the present invention is of a movable magnet type and the distance between the magnetic poles of the yoke can be finely adjusted by a screw mechanism, so the effect is very large as shown below.

(1) Variations in driving force and stroke due to dimensional variations in manufacturing parts such as yokes and magnets can be adjusted, and products of stable quality can be produced.

(2) Since the distance between the left and right magnetic poles of the yoke can be freely adjusted, conditions that suit the external load can be set.

(3) Stroke and driving force conditions can be changed.

(4) When using a commercial frequency as a power source, it is possible to adjust to the optimum state at either 50 Hz or 60 Hz, and to reduce the difference in output between 50 Hz and 60 Hz.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment, and FIG. 3 is a partial sectional view showing another embodiment of the movable element. 1: Yoke, 2: Coil, 3: Mover, 4゜14: Permanent magnet, 8: Bolt, 11, 12: Screw.

Claims (1)

[Claims for Utility Model Registration] ■ Two cylindrical electromagnetic coils with the same polarity at adjacent parts in a yoke made of a ferromagnetic material whose longitudinal cross-sectional end face shape in a plane including the shaft is formed into a substantially E shape. A reciprocating drive device is provided with a movable element, which is arranged so as to generate a magnetic field, and is provided in the center of the yoke with a movable element made of a permanent magnet having N and S magnetic poles in the axial direction and magnetic pole pieces fixed to both ends thereof. In this method, the yoke is divided into three parts in the axial direction into a center yoke piece and end yoke pieces on both sides thereof, and the center yoke piece and the end yoke pieces are connected through a screw member so that one can move in the axial direction relative to the other. A reciprocating drive device characterized by being connected to each other. 2. A utility model registration application in which the vertical cross-sectional end faces of the center yoke piece and the end yoke piece are formed into a ring shape and an L-shape, respectively, and the end faces of the end yoke pieces are brought into close contact with each other, so that the center yoke piece is movable. A reciprocating drive device according to scope 1. 3. The reciprocating drive device according to claim 1, wherein the center yoke piece and the end yoke piece are formed in a T-shape and an L-shape, respectively, so that the end yoke piece is movable.