JPH0445426Y2 - - Google Patents

Description

[Detailed explanation of the idea] 【Technical field】

The present invention relates to the structure of an electromagnetic drive unit. For example, in a diaphragm-type electromagnetic pump, it can be used as an electromagnetic drive unit for repeatedly reciprocating a movable body for moving a diaphragm valve using electromagnetic force, or as an electromagnetic drive unit for a linear actuator. It is something.

[Background technology]

Conventionally, as shown in FIG. 6, a pair of cores 4 are formed so as to project from the center of the inner circumference of an iron core 8 of an outer iron type, and a movable body 2 is placed between the tips of the cores 4. An excitation space 3 is secured for the excitation to pass through, and a substantially cylindrical bobbin 6 made of synthetic resin around which an excitation coil 5 is wound is inserted into each core 4 and bonded or press-fitted. The bobbin 6 was fixed to the core 4. However, in such a structure, the bobbin 6 may move along the core 4 as shown in FIG. 7 due to impact when the device incorporating this electromagnetic drive unit is dropped or vibrations during operation. When the bobbin 6 moves and pops out from the tip of the core 4, the excitation space 3 in which the movable body 2 moves is partially blocked by the bobbin 6, and as a result, the movable body 2 collides with the bobbin 6. As a result, there was a problem in that the movable body 2 and the bobbin 6 were damaged. Further, flanges 9 are provided around both ends of the bobbin 6 so that the coil 5 is wound so as not to protrude laterally, and the coil 5 is wound between the flanges 9. However, due to the tension applied to the coil 5 when the coil 5 is wound between the flanges 9, a force is constantly applied from the coil 5 to the flange 9 to push the flange 9 apart. For this reason, if the synthetic resin flange 9 has softened somewhat due to being used in a high-temperature environment, the flange 9 will move outward as shown by the broken line in FIG.
When the flange 9 is deformed in this way, the movable body 2 and the flange 9 similarly collide, causing damage to the movable body 2 and the bobbin 6. Furthermore, the movable body 2 inserted into the excitation space 3 between the cores 4 is slidably held and positioned with the central shaft 10 by a bushing of a casing (not shown). When assembling, first set the iron core 8 with the bobbin 6 attached inside the casing, then insert the movable body 2 between the cores 4.
The shaft 10 of the movable body 2 must be inserted into the bush of the casing. However, axis 1
0 into the bushing, the movable body 2 can deviate greatly in the direction perpendicular to the direction connecting the cores 4, as shown in FIG. It was difficult to insert and assemble.

[Purpose of invention]

The present invention was developed in view of the above-mentioned technical background, and its purpose is to eliminate the causes of collision between the movable body that reciprocates between the cores and the bobbin, and to eliminate the causes of collision between the movable body and the bobbin. The goal is to make assembly easier.

[Disclosure of invention]

The structure of the electromagnetic drive unit of the present invention consists of an excitation space 3 for reciprocating a movable body 2 holding a permanent magnet 1.
A pair of cores 4 are made to face each other with the cores 4 in between, and a bobbin 6 having an excitation coil 5 wound around its outer periphery is inserted into each of the cores 4, and the flange 9 of at least one bobbin 6 is connected to the other bobbin. 6, and the tip of the rib 7 is attached to the other bobbin 6.
The flange 9 of the other bobbin 6 or the tip of the rib 7 of the other bobbin 6 is placed close to or in contact with the excitation space 3 sandwiched between at least one pair of ribs 7 from both sides. However, core 4
The rib 7 protruding from the bobbin 6 inserted into the opposite bobbin 6 or the rib 7 of the bobbin 6
Since both bobbins 6 cannot move along the core 4, the bobbins 6 cannot move from the core 4 due to shock or vibration and block the excitation space 3. There is no collision between the bobbin 6 and the movable body 2. In addition, since the rib 7 protrudes from the flange 9, even if the flange 9 of the bobbin 6 is pressed outward by the expansion force of the coil 5 in a high temperature environment,
Since the flange 9 is prevented from being deformed by the ribs 7, the excitation space 3 is not blocked by the deformed flange 9, and collision between the flange 9 and the movable body 2 can also be prevented. Further, since the ribs 7 are provided so as to sandwich both sides of the excitation space 3, when assembling the movable body 2, the movable body 2 can be positioned by inserting the movable body 2 between the ribs 7.
The movable body 2 can be easily assembled. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. What is shown in FIGS. 1 to 3 is a first embodiment of the present invention. The iron core 8 is an integral outer iron type laminated iron core made by laminating a plurality of iron pieces to form an annular shape, and a pair of cores 4 are formed to protrude from the center of the inner periphery. The tips of the cores 4 are opposed to each other, and an excitation space 3 in which the movable body 2 moves back and forth is formed between the tips of the cores 4. The iron piece that makes up this iron core 8 is not a single ring-shaped piece. For example, the second
As shown in the figure, a substantially E-shaped iron piece 8a and a substantially T-shaped iron piece 8b are combined. As shown in FIG. 3, the movable body 2 has a pair of permanent magnets 1 with opposite polarities embedded in both ends of a movable block 11 made of synthetic resin. is highlighted. This shaft 10 is slidably supported by a bush of a casing (not shown), and the shaft 10 is
0 is connected to a diaphragm valve (not shown), and the reciprocating motion of the movable body 2 causes the diaphragm valve to move. The bobbin 6 is a synthetic resin molded product, and has a substantially rectangular cylindrical winding drum 13 with a fitting hole 12 in the center for inserting the core 4, and vertical flanges 9 at both ends. An excitation coil 5 is wound between flanges 9 on the outer periphery of the body 13. Furthermore,
A pair of ribs 7 are bored on the outer surface of one flange 9 with a fitting hole 12 in between, and both ribs 7
are arranged on both sides of the movable body 2 in the reciprocating direction indicated by the double-headed arrow in FIG. There is no possibility that the movable body 2 will collide with the rib 7. However, this coil 5
The iron core 8 is assembled after the bobbin 6 is fixed to the core 4 by press-fitting the core 4 into the fitting hole 12 of the bobbin 6 wound with or by inserting and gluing it. are arranged so that the ribs 7 are butted against each other, and the ribs 7 are located on both sides of the reciprocating direction of the movable body 2 (in FIG. 1, the direction is perpendicular to the plane of the paper). Here, the distance L between the flanges 9 of the bobbin 6 is sufficiently larger than the thickness t of the movable body 2, and there is enough space between the flanges 9 of the bobbin 6 and between the ribs 7 to allow the movable body 2 to reciprocate with enough margin. An excitation space 3 is formed. Further, the height of the ribs 7 is approximately equal to 1/2 of the distance L between the flanges 9, and the tips of the ribs 7 are close to each other or in contact with each other. Therefore, even if the bobbin 6 tries to move along the core 4, or even if the flange 9 tries to deform by being pressed by the coil 5, the tips of the ribs 7 will come into contact with each other, and the excitation space 3 will be closed by the bobbin 6.
This prevents the bobbin 6 and the movable body 2 from being narrowed.
This ensures that no conflicts occur.
Moreover, the excitation space 3 in which the movable body 2 is arranged is a bobbin 6
The movable body 2 is surrounded by a flange 9 and a rib 7.
Positioning during assembly is also easy. When an alternating current is passed through the excitation coil 5, an alternating magnetic field whose polarity is alternately reversed is generated in the excitation space 3 between both coils 5, and this causes the pair of permanent magnets 1 of the movable body 2 to alternately move. is attracted between the coils 5,
The movable body 2 repeats reciprocating motion due to the repulsion. The one shown in FIG. 4 is another example of the present invention, in which a rib 7 with a length L' approximately equal to the distance L between the flanges 9 protrudes from one side of the outer surface of the flanges 9 of the bobbin 6,
The ribs 7 are arranged alternately as shown in FIG. 4 so that the tips of the ribs 7 are close to or in contact with the flanges 9 of the bobbin 6 facing each other. Note that this rib 7 is provided in a protruding manner at a position offset from the center of the bobbin 6 by a distance W/2 which is sufficiently larger than 1/2 of the width w of the movable body 2. What is shown in FIG. 5 is yet another example of the present invention,
A T-shaped rib 7 protrudes from the outer surface of the flange 9, and the strength of the rib 7 can be increased by providing the rib 7 which is not flat. Although the above embodiment has been described using a diaphragm type electromagnetic pump as an example, the device is not limited to such a device. Alternatively, it can be implemented in a linear actuator that demagnetizes and moves the movable body 2 back and forth to project or retire a rod or the like.

[Effect of the invention] As described above, in the present invention, the ribs protruding from the bobbin inserted into the core are placed close to or in contact with the opposite bobbin or the ribs of the bobbin, so that both bobbins are aligned along the core. Since it cannot be moved, the bobbin will not move from the core and block the excitation space due to shocks when the device falls or vibrations during operation, and collisions between the bobbin and movable objects can be prevented. It is something. In addition, since the ribs protrude from the flange, even if the flange of the bobbin is pressed outward due to the expansion force of the coil in a high-temperature environment, the rib will prevent the flange from deforming. The excitation space is not blocked by the flange, and collisions between the flange and the movable body can be prevented. Therefore, it is possible to prevent collisions between the movable body and the bobbin due to displacement of the bobbin due to shocks and vibrations, deformation of the flange due to the expansion force of the coil, etc., thereby eliminating damage caused by collisions with the movable body or the bobbin. There are advantages. In addition, since ribs are provided to sandwich both sides of the excitation space, when assembling the movable body, the movable body can be positioned by inserting the movable body between the ribs, and the axis of the movable body can be aligned with the bushing of the casing. It is easy to insert, and it is easy to incorporate a movable body.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a partially broken front view of the same as the above, Figure 3 is a perspective view showing the movable body and the bobbin with the coil wound in the same as the above, Figure 4 is a front view showing another example of the present invention, and Figure 5 is the present invention. FIG. 6 is a partially cutaway front view of the conventional example; FIG. 7 is a partially cutaway front view showing the bobbin in a state where the same bobbin has fallen off; FIG. The figure is a front view showing another problem in the conventional example, and FIG. 9 is a front view showing still another problem in the conventional example. 1... Permanent magnet, 2... Movable body, 3... Excitation space, 4... Core, 5... Coil, 6... Bobbin,
7...rib, 9...flange.

Claims (1)

[Scope of utility model registration request] A pair of cores are opposed to each other across an excitation space for reciprocating a movable body holding a permanent magnet, and a bobbin having an excitation coil wound around the outer periphery is inserted into each of the cores, and at least one of the cores is inserted into each core. A rib protrudes from the flange of one bobbin toward the other bobbin, and the tip of the rib is brought close to or in contact with the flange of the other bobbin or the tip of the rib of the other bobbin, and the excitation space is defined by at least one pair of ribs. The structure of the electromagnetic drive section that is sandwiched from both sides.