JP3798293B2 - solenoid - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a solenoid for an oil-immersed solenoid valve.
[0002]
[Prior art]
As shown in Japanese Utility Model Publication No. 59-15454, for example, the solenoid structure of a conventional oil-immersed solenoid valve has a cylindrical hollow material in which a closed body is welded at one end and a fixed iron core is welded at the other end. A movable iron core slidable in the axial direction within the hollow member, a coil inserted on the outer periphery of the hollow member, an annular yoke provided in contact with the coil on the outer periphery of the hollow member, and a contact with the yoke A case that is provided so as to contain a contact yoke, a coil, a fixed iron core, and a movable iron core, and that forms a magnetic circuit with the coil, the fixed iron core, the movable iron core, and the yoke; The outer diameter of the cylindrical part of the iron core and the outer diameter of the hollow material are made the same, whereas the inner diameter of the coil and the yoke into which the hollow material is fitted is made almost the same, and the gap between the two is made as small as possible. Was supposed to be. For this reason, machining was performed in the vicinity of the welded part so as to exclude the raised part after welding, and after the welding, the raised part was machined to a size equal to or less than the outer diameter of the hollow material. However, machining such a hollow member has problems such as an increase in the number of processing steps, a decrease in thickness, and a decrease in strength due to the deletion of a welded portion.
[0003]
Therefore, in Japanese Patent Laid-Open No. 8-213230, in order to allow the assembly of the coil without removing the raised portion after welding, the fixed core outer diameter is fitted with the coil inner diameter without any gap, and the fixed core side hollow is formed. The outer diameter of the material is smaller than the inner diameter of the coil so that a gap is provided between them, the outer diameter of the closing body is the same as the outer diameter of the hollow material, and the inner diameter of the yoke is fitted with the outer diameter of the hollow material without any gap. It was divided into two parts, and was assembled by avoiding the swelled portion of the welded portion between the closing body and the hollow material during assembly, and then fixed with a case. For this reason, the outer diameter of the case is made larger than the outer diameters of the closing body and the hollow material. Therefore, this part cannot be used effectively as a magnetic path, and the magnetic force is reduced, and measures such as thickening the yoke are required. In addition, when assembling the coil-related parts, it is necessary to assemble the O-ring, coil, yoke, case, etc. one by one. Further, such a structure cannot be used for a double-acting solenoid operated in two directions using two coils.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a solenoid with excellent magnetic properties that is easy to assemble and that does not require a reduction in magnetic force, while eliminating the need for finishing by machining a hollow material in view of the above-described problems. It is in.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a cylindrical hollow material in which a closing body is welded at one end and a fixed iron core is welded at the other end, and is slidable in the axial direction within the hollow material. A movable iron core, a coil inserted into the outer periphery of the hollow material, an annular yoke provided in contact with the coil on the outer periphery of the hollow material, the yoke, the coil, and the fixed iron core in contact with the yoke A solenoid for an oil-immersed solenoid valve, comprising: a case in which the coil, the fixed iron core, the movable iron core, and the yoke form a magnetic circuit. The outer diameter of the fixed iron core is fitted to the inner diameter of the coil without any gap, and the outer diameter of the hollow material on the side of the fixed iron core is made smaller than the inner diameter of the coil so that a gap is provided between them. And fixed as welded The heart to be inserted into the coil inner diameter, closed side end portion of said closure member only One said hollow member the outer diameter smaller than the hollow member outer diameter of it to a small diameter so as to weld the closing body which is smaller in diameter This makes it possible to insert the closed body that is still welded to the hollow material into the inner diameter of the coil, and eliminates the need for a finishing process that cuts the raised portion of the welded portion to the outer diameter of the hollow material by machining after welding. increasing the number of steps, without the strength reduction due to deletion of the reduction and the weld portion of the hollow member thickness, and the yoke inner diameter while eliminating the problem of decrease of the magnetic force by fitting without a gap and the outside diameter of the hollow member, the set The problem was solved by providing a solenoid that is easy to attach and has excellent magnetic properties .
[0006]
According to such a configuration, the outer diameter of the hollow material on the side of the fixed iron core is made smaller than the inner diameter of the coil so that a gap is provided therebetween, the outer diameter of the closing body is made smaller than the outer diameter of the hollow material, and the hollow material Since the closing body side end is made small diameter so as to be welded to the closing body made small diameter, by eliminating the need for finishing processing that cuts the raised portion of the welded portion to the hollow material outer diameter or less by machining after welding, It has become possible to provide a solenoid that is easy to assemble and has excellent magnetic properties, while eliminating the problems of increased processing steps, reduced thickness, reduced strength due to the deletion of welds, and reduced magnetic force.
[0007]
Preferably, two coils and a fixed iron core are provided almost symmetrically, the inside of the outer fixed iron core is made smaller in diameter instead of the closing body, and the end of the hollow member on the side of the closing body is fixed in a small diameter. By being welded to the inside of the iron core, a double-acting solenoid that can be operated in two directions and two directions can be obtained using two coils.
[0008]
1
DETAILED DESCRIPTION OF THE INVENTION
A solenoid according to a first embodiment of the present invention will be described with reference to FIG. 1A is a schematic longitudinal sectional view of the solenoid, and FIG. 1B is a partially enlarged view of a portion B in FIG. 1A and 1B, a hollow material 1 is welded with a closing material 2 at one end and a fixed iron core 3 at the other end by welds 1a and 1b, respectively. Outside the hollow member 1, O-rings 10 and 11 are provided in contact with the flange 3c portion of the fixed iron core 3 to prevent the coil 6 from being inserted and water from entering the coil. The coil 6 uses an electric wire for connecting a bobbin, a winding wound around the bobbin, and an external power source of the winding, and a packing 6c for preventing water from entering from the outer periphery of the electric wire is a molding material 6d. It is molded as a single piece. Furthermore, a yoke 4 is provided in contact with the coil 6 on the outside of the hollow material 1, and a case 5 is attached so as to cover these components. The case 5 is sandwiched between a flange 3c of the fixed iron core 3 and a nut 13 screwed to a screw 2a provided on the closing member 2, and a coil or the like is fixed to form a solenoid.
[0009]
The outer diameter d1 of the fixed iron core 3 is fitted with the inner diameter of the coil 6 without any gap, and the outer diameter d2 of the hollow material 1 on the side of the fixed iron core is made smaller than the inner diameter of the coil 6 so as to provide a gap therebetween. The coil 6 is inserted so as to avoid the swelled portion of the welded portion 1b between the outer periphery of 3 and the outer periphery of the hollow material 1. The outer diameter d3 of the closing body 2 is made smaller than the outer diameter d2 of the hollow material 1, and the end on the closing body side of the hollow material 1 is made smaller so as to be welded to the closing body 2 having a smaller diameter. Therefore, the coil 6, the yoke 4, and the case 5 are inserted so as to avoid the bulging portion of the welded portion 1a between the closed body side end of the hollow member 1 and the closed body 2. Since the inner diameter of the yoke 4 is fitted to the outer diameter of the hollow material 1 without any gap, the outer diameter of the case is made larger than the outer diameters of the closing body and the hollow material as disclosed in JP-A-8-213230. Since this portion cannot be used effectively as a magnetic path, the magnetic force is not reduced, and the finish by machining the hollow material is not required, but the magnetic force is not reduced and it is not necessary to increase the thickness of the yoke 4. became. Furthermore, in the assembly of coil-related parts, the O-rings 10, 11, the coil 6, the yoke 4, the case 5 and the like can be assembled as an assembly and can be assembled to the outer periphery of the fixed core 3 and the outer periphery of the hollow material 1. In particular, coil-related parts including yoke assembly can be easily assembled.
[0010]
The solenoid of the oil immersion type solenoid valve according to the second embodiment of the present invention will be described with reference to FIG. (A) is a schematic longitudinal cross-sectional view of a solenoid, (b) shows the elements on larger scale of the B section of (a). As shown in FIG. 2, two coils 6a, 6b and two fixed iron cores 3a, 3b are provided almost symmetrically, and the inner side of the outer fixed iron core 3b is made smaller in diameter instead of the closed body 2 in FIG. The end of the material 1 on the closed body side was made small in diameter and welded to the inside of the fixed iron core 3b. Of the yokes 4a, 4b, and 4c, the yoke 4a can be omitted by using a mating part with the fixed iron core 3a or a counterpart part to which a solenoid is attached as a magnetic path. Since the yokes 4b and 4c are common parts, the inner diameter d4 of the yoke 4c is the same as the inner diameter of the yoke 4b (substantially the same as the outer diameter d2 of the hollow material 1 on the fixed iron core side), but it may be different. With this configuration, a double-acting solenoid that can be operated in two directions can be obtained using two coils.
[Brief description of the drawings]
1A is a schematic longitudinal sectional view of a solenoid of an oil-immersed solenoid valve according to a first embodiment of the present invention, and FIG. 1B is a partially enlarged view of a portion B in FIG.
2A is a schematic longitudinal sectional view of a solenoid of an oil-immersed solenoid valve according to a second embodiment of the present invention, and FIG. 2B is a partially enlarged view of a portion B in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow material 1a, 1b Welding part 2 Closure material 3, 3a, 3b Fixed iron core 4, 4a, 4b, 4c Yoke 5 Case 6, 6a, 6b Coil 8 Movable iron core

Claims (2)

A cylindrical hollow material having a closed body welded at one end and a fixed iron core welded at the other end, a movable iron core slidable in the axial direction within the hollow material, and an outer periphery of the hollow material. A coil, an annular yoke provided on the outer periphery of the hollow material so as to contact the coil, a yoke, the coil, the fixed iron core, and the movable iron core provided in contact with the yoke, A solenoid for an oil-immersed solenoid valve having a case in which a magnetic circuit is formed by the coil, the fixed iron core, the movable iron core, and the yoke, wherein the fixed iron core outer diameter is the coil inner diameter. The outer diameter of the hollow material on the side of the fixed iron core is smaller than the inner diameter of the coil so that the fixed iron core is welded to the hollow material with a gap therebetween. to be inserted within, the closed The shut-off the outer diameter remains closed side end portion of the One only smaller than the hollow member outer diameter wherein the hollow material which is welded to the hollow member by a small diameter so as to weld the closing body which is smaller in diameter of the body Can be inserted into the inside diameter of the coil, eliminating the need for finishing work that cuts the swelled portion of the welded portion below the outer diameter of the hollow material by machining after welding, increasing the number of processing steps, reducing the hollow material thickness, and welding The yoke has an inner diameter that is easy to assemble and has excellent magnetic properties while eliminating the problem of lowering the magnetic force by fitting the inner diameter of the yoke with the outer diameter of the hollow material without any gap. Solenoid to do. The coil and the fixed iron core are each provided approximately two symmetrically, the inner side of the outer fixed iron core is made smaller in diameter instead of the closing body, and the end of the hollow member on the side of the closed body is made smaller in the fixed iron core. The solenoid according to claim 1, wherein the solenoid is welded together.

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