JP4454167B2 - electromagnet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnet whose outer periphery is a resin mold portion and whose lead wires are led out to the outside.
[0002]
[Prior art]
In this type of electromagnet, the lead wire electrically connected to the lead portion of the coil winding by soldering is led out from the grommet provided in the lead wire lead-out portion of the resin mold portion. (For example, see Utility Model Registration No. 2541524).
[0003]
[Problems to be solved by the invention]
However, in such a conventional electromagnet, the lead wire electrically connected by soldering to the lead portion of the coil winding is directly led out from the grommet, so when this electromagnet is for DC, the AC In order to operate with an external power source, a rectifying element for converting alternating current into direct current had to be provided separately.
[0004]
The present invention provides an electromagnet in which a rectifying element for converting alternating current to direct current is accommodated in a resin mold portion, and a direct current electromagnet can be operated with an external power source without the need for a separate rectifying element. It is a problem.
[0005]
[Means for Solving the Problems]
For this reason, in the present invention, the yoke that forms the magnetic circuit that generates the attractive force by which the movable iron core is attracted to the fixed iron core by energizing the DC coil is integrally formed with the resin bobbin together with the coil bobbin around which the DC coil is wound. A resin mold part is provided, and the resin mold part is provided with a lead wire lead member for inserting an AC lead wire electrically connected to an external AC power source. Inside the resin mold part, a rectifying element for converting AC to DC, and this a substrate for electrically connecting the AC leads from the direct current lead and an external AC power supply from the DC coil rectifying device installed, the box member and the resin mold erected before Symbol yoke by placing the substrate The substrate is integrally formed and mounted on the box member so as to be engageable with the lead wire lead-out member . In this case, the box member on which the substrate is placed has an inner space surrounded by a wall portion, the rectifying element attached to the substrate is accommodated in the inner space, and the inner space containing the rectifying element is provided with a heat insulating material. It is desirable to fill.
[0006]
According to the present invention, the alternating current flowing through the alternating current lead wire from the external alternating current power source is converted into direct current by the rectifying element, the direct current coil is energized through the direct current lead wire, and is constituted by the yoke, the fixed iron core, and the movable iron core. An attractive force is generated in the magnetic circuit, and the movable iron core is attracted to the fixed iron core. The rectifying element is mounted on a box member standing on the yoke, and is attached to a substrate that electrically connects the DC lead wire from the DC coil and the AC lead wire from the external AC power source. Since it is integrally formed inside the mold part, it is possible to operate a DC electromagnet with an AC external power supply without the need for a separate rectifying element.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention in which an electromagnet is applied to an electromagnetic valve will be described with reference to the drawings.
In FIG. 1 and FIG. 2, reference numeral 1 denotes an iron core block, which fixes a fixed iron core 3 to one end of a cylindrical member 2 opened at both ends, closes one end opening of the cylindrical member 2, and the other end of the cylindrical member 2. An attachment member 4 to be attached to a valve main body (not shown) is fixed to close the other end opening of the tubular member 2. The attachment member 4 is provided with a fluid inflow passage 4A and an outflow passage 4B, and a valve seat 5 is formed between the inflow passage 4A and the outflow passage 4B. Reference numeral 6 denotes a movable iron core, which is opposed to the fixed iron core 3 and is slidably inserted in the cylindrical member 2 in the axial direction, and is separated from the fixed iron core 3 by a spring 7 force interposed between the fixed iron core 3. While being biased in the direction, it is attracted to the fixed iron core 3 against the force of the spring 7 by the attraction force generated by energization. A pilot valve body 8 is engaged with the movable iron core 6 at an end opposite to the side facing the fixed iron core 3, and the pilot valve body 8 extends inside the mounting member 4 and slides inside the mounting member 4. A throttle hole 10 drilled in the main valve body 9 that is freely inserted is opened and closed. That is, the pilot valve body 8 is moved by energization while closing the throttle hole 10 of the main valve body 9 as the movable iron core 6 is urged in the direction away from the fixed core 3 by the spring 7 force in a non-energized state. As the iron core 6 is attracted to the fixed iron core 3 against the force of the spring 7, the throttle hole 10 of the main valve element 9 is opened. When the throttle valve 10 is closed by the pilot valve body 8, the main valve body 9 is energized by the force of a spring 11 interposed between the main valve body 9 and the pilot valve body 8, and is seated on the valve seat 5 to enter the inflow passage 4A and the outflow passage 4B. In the state where the throttle hole 10 is opened by the pilot valve body 8, the fluid flows from the inflow path 4A through the throttle hole 10 and the radial hole 12 drilled in the main valve body 9, and the fluid flows into the outflow path 4B. An acting force based on a pressure difference between the front and rear of the throttle hole 10 caused by the outflow is provided so as to be separated from the valve seat 5 against the force of the spring 11 and communicate between the inflow passage 4A and the outflow passage 4B.
[0008]
Reference numeral 13 denotes a coil block, which includes a coil bobbin 14, a yoke 15, a lead wire lead member 16, a rectifying element 18, a substrate 19, and a box member 20, which are integrally molded with a resin mold. The coil bobbin 14 has an insertion hole 22 through which the cylindrical member 2 and the fixed iron core 3 of the iron core block 1 are inserted in the center, and a DC coil 23 is wound between flanges formed at both ends in the axial direction. DC lead wires 24A and 24B that are electrically connected to the end of winding by soldering are led out from a lead portion 25 formed on one flange. The yoke 15 is formed in a substantially U shape with an opening at the bottom, and the coil bobbin 14 is accommodated between both side walls in the axial direction. An insertion hole 26A having the same diameter as the insertion hole 22 of the coil bobbin 14 is formed at the center of both side walls. The cylindrical member 2 and the fixed iron core 3 of the iron core block 1 are provided so that they can be inserted. Further, the yoke 15 has a notch 27 in the vicinity of the ridge portion between the one side wall and the upper wall, and a lead-out portion 25 of the coil bobbin 14 is provided so as to protrude from the notch 27.
[0009]
The resin mold portion 21 includes a lead wire lead-out portion 21A on the upper side, and the lead wire lead-out member 16 is disposed on the lead wire lead-out portion 21A. The lead wire lead-out member 16 has a cylindrical shape, and a base portion thereof is integrally formed with the lead wire lead-out portion 21A by a resin mold, and a tip portion projects from the lead wire lead-out portion 21A. The grommet 17 is inserted through the AC lead wires 28A and 28B that are electrically connected to the AC power source. The rectifying element 18 converts alternating current into direct current, and is attached to the lower surface of the substrate 19. The substrate 19 is provided with printed wiring so as to electrically connect the DC lead wires 24A and 24B and the AC lead wires 28A and 28B through the rectifying element 18. The box member 20 is formed in a substantially square shape having an inner space surrounded by a wall portion, and is erected by fitting four leg portions 20A, 20B. The box member 20 has four convex portions 29A, 29B, 29C, and 29D protruding upward, and the edge portion 16A of the root portion of the lead wire lead-out member 16 is positioned above one side portion 19A of the substrate 19. The substrate 19 is fitted and placed on the convex portions 29A to 29B, and one side portion 19A of the substrate 19 can be engaged with the edge portion 16A of the lead wire lead-out member 16 when the resin mold portion 21 is integrally formed. Suppresses 19 lift. Further, the box member 20 accommodates the rectifying element 18 attached to the lower surface of the substrate 19 in a state where the substrate 19 is placed in the internal space, and the heat insulating material 30 such as silicon or epoxy resin is accommodated in the internal space in which the rectifying element 18 is accommodated. And the rectifying element 18 is protected from a high temperature generated when the resin mold portion 21 is integrally formed.
[0010]
A nut member 31 for assembling the iron core block 1 and the coil block 13 is screwed into the outer end portion of the fixed iron core 3. That is, the tubular member 2 and the fixed iron core 3 are inserted into the insertion holes 22, 26 </ b> A, and 26 </ b> B of the coil bobbin 14 and the yoke 15, and the nut member 31 is screwed into the fixed iron core 3 to be tightened. A yoke 15 is sandwiched between the iron core block 1 and the coil block 13. A magnetic circuit that generates an attractive force by which the movable iron core 6 is attracted to the fixed iron core 3 by energization of the DC coil 23 is constituted by the yoke 15, the fixed iron core 3, and the movable iron core 6.
[0011]
Next, the operation of this configuration will be described.
FIG. 1 shows a state in which the DC coil 23 is not energized. The movable iron core 6 is urged in the direction away from the fixed iron core 3 by the force of the spring 7, the pilot valve body 8 closes the throttle hole 10, and the main valve body 9. Is energized by the force of the spring 11 and is seated on the valve seat 5 to block between the inflow path 4A and the outflow path 4B.
[0012]
In this state, when the DC coil 23 is energized from the external AC power source via the AC lead wires 28A and 28B, the rectifying element 18, and the DC lead wires 24A and 24B, the movable iron core 6 resists the force of the spring 7 to the fixed iron core 3. The pilot valve body 8 opens the throttle hole 10 and the main valve body 9 is separated from the valve seat 5 against the force of the spring 11 by the acting force based on the pressure difference between the front and rear of the throttle hole 10 and the inflow passage 4A. It communicates with the outflow channel 4B. When the DC coil 23 is deenergized, the movable iron core 6, the pilot valve body 8, and the main valve body 9 are restored to the state shown in FIG.
[0013]
In this operation, when the DC coil 23 is energized from an external AC power source, the AC is converted into DC by the rectifying element 18, and the rectifying element 18 is placed on the box member 20 erected on the yoke 15 and the DC lead wire 24 </ b> A, 24B and AC lead wires 28A and 28B are attached to a substrate 19 that is electrically connected, and integrally formed inside the resin mold portion 21 together with the substrate 19 and the box member 20, so that there is no need to provide a separate rectifying element and the AC external A DC electromagnet can be activated by the power supply. Further, since the one side 19A of the substrate 19 is placed on the box member 20 so as to be engageable with the edge 16A of the root portion of the lead wire lead-out member 16, the resin mold portion 21 is integrally molded with the resin mold 21. Even if the substrate 19 is pushed up slightly, the one side portion 19A of the substrate 19 engages with the edge portion 16A of the lead wire lead-out member 16 and cannot be pushed up any more. be able to. Furthermore, since the rectifying element 18 attached to the substrate 19 is accommodated in the internal space of the box member 20 and the internal space is filled with the heat insulating material 30, the rectification is performed from the high temperature generated when the resin mold portion 21 is integrally formed. The element 18 can be reliably protected.
[0014]
FIG. 3 shows another embodiment of the present invention. The same reference numerals are given to the same portions as those of the first embodiment, the description thereof is omitted, and only different portions will be described.
The box member 20 mounts the substrate 19 so that the bottom surface portion of the grommet 17 included in the lead wire lead-out member 16 is positioned above one side portion 19A of the substrate 19, and when the resin mold portion 21 is integrally formed, one side portion of the substrate 19 is placed. 19A can be engaged with the bottom surface of the grommet 17 to prevent the substrate 19 from being lifted. For this reason, even when the substrate 19 is slightly lifted upward by the resin mold when the resin mold portion 21 is integrally formed, one side portion 19A of the substrate 19 is engaged with the bottom surface portion of the grommet 17 included in the lead wire lead-out member 16. And since it cannot push up any more, the effect similar to one Embodiment can be acquired.
[0015]
In one embodiment and other embodiments, the electromagnet is applied to the electromagnetic valve. However, it is needless to say that the electromagnet may be applied to other devices depending on the application.
[0016]
【The invention's effect】
Thus, in the invention according to claim 1, since the rectifying element for converting alternating current from the external power source into direct current is integrally formed with the substrate and the box member inside the resin mold portion, there is no need to separately provide the rectifying element. A DC electromagnet can be operated by an AC external power supply. The substrate for electrically connecting the AC leads from the direct current lead and an external AC power supply from the DC coil is attached a rectifying element is then placed on the box member provided to be engaged to the lead-guiding member Therefore, even when the resin mold part is integrally formed, even if the substrate is pushed up by the resin mold, the substrate is engaged with the lead wire lead-out member and cannot be pushed up any more. it can.
[0017]
Further, in the invention according to claim 2, in addition to the effect of the invention according to claim 1, the rectifying element attached to the substrate is accommodated in the internal space of the box member, and this internal space is filled with a heat insulating material. The rectifying element can be reliably protected from the high temperature that occurs when the resin mold part is integrally formed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention in which an electromagnet is applied to an electromagnetic valve.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view of a main part showing another embodiment of the present invention.
[Explanation of symbols]
3 Fixed Iron Core 6 Movable Iron Core 14 Coil Bobbin 15 Yoke 16 Lead Wire Leading Member 18 Rectifier 19 Board 20 Box Member 23 DC Coils 24A and 24B DC Lead Wires 28A and 28B AC Lead Wire 30 Heat Insulating Material

Claims (2)

A yoke that forms a magnetic circuit that generates an attractive force by which the movable iron core is attracted to the fixed iron core by energizing the DC coil is integrally molded with a resin bobbin around which the DC coil is wound, and a resin mold portion is provided. The mold part is provided with a lead wire lead member for inserting an AC lead wire that is electrically connected to an external AC power source. Inside the resin mold part, a rectifying element that converts alternating current into direct current, and a DC coil that is attached with this rectifying element a substrate for electrically connecting the AC leads from the direct current lead and an external AC power source, and a box member which is erected before Symbol yoke by placing the substrate integrally molded with resin molding from, the box An electromagnet characterized in that the substrate placed on a member is provided so as to be engageable with the lead wire lead-out member .   The box member on which the substrate is placed has an internal space surrounded by a wall portion, the rectifying element attached to the substrate is accommodated in the internal space, and the internal space in which the rectifying element is accommodated is filled with a heat insulating material. The electromagnet according to claim 1.

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