JP2001076927A - Electromagnetic coil for control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure an insulating distance and to increase the tensile strength of a lead wire by providing a frame for holding a potting agent around each terminal until the potting agent hardens when each terminal is sealed with the potting agent. SOLUTION: In an electromagnetic coil 1, members other than a terminal 6 of an external connecting part 3 are sealed. At this moment, a potting agent is applied around the external connecting part 3 and a frame is provided for holding the potting agent until it hardens. Further, a lead wire 2 is connected to the terminal 6 by swaging, soldering, welding, and fit between terminals. And then the terminal 6 connecting to the lead wire 2 is bent and stored in the frame for holding the potting agent, and sealing is made with the potting agent, thereby increasing the tensile strength of the lead wire. Namely, a direction of drawing the terminal 6 and a direction of extending the lead wire 2 make an angle, and a lead wire fixing section 10 and a lead wire fixing component 14 fix and reinforce the lead wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coil for a control valve, and more particularly to an electromagnetic coil for a control valve in which a winding portion (electromagnetic coil), terminals connected thereto, and a lead wire are sealed and formed at one time.

[0002]

2. Description of the Related Art Conventionally, in the above-described electromagnetic coil for a control valve, a winding portion, terminals connected thereto, and a lead wire are formed by sealing at a time, as disclosed in JP-A-9-106911.
No. has been proposed.

[0003] This is, as shown in FIG.
The outer periphery of the winding portion 115 is molded and sealed with resin so as to cover the connection portions P and Q between the two end portions 115a and 115b of the electric wire forming the pair of lead wires 121 and 122, and before that, the winding portion is formed. On the outer periphery of the pair 115, the leading ends of the pair of lead wires 121, 122 are
2 so that both ends of the electric wire and the lead wire 12
The connection portions P and Q with the tip portions of the first and 122 can be forcibly separated from each other by an appropriate distance. Reference numeral 110 in FIG. 21 denotes a resin-sealed coil, 112 denotes a bobbin,
Reference numeral 20 denotes a resin mold.

[0004]

By the way, in the above-mentioned conventional device, the heat-resistant grade of the lead wire coating is increased in order to withstand the high temperature of the sealing material and the mold at the time of sealing molding with resin. Therefore, there is a problem that the combination of the sealing material and the lead wire is limited due to the necessity of securing the sealing property between the sealing material and the lead wire, and the selection must be made in a narrow range.

Further, in the case of the conventional molded coil, it is necessary to seal and mold the temperature fuse together with the magnet wire, the terminal, etc., so that the temperature (opening) temperature of the temperature fuse is higher than the temperature of the sealing resin. Needed to be higher. Therefore, when it is desired to break the wire at a low temperature equal to or lower than the temperature of the sealing molding resin, there has been a problem that the use of a temperature fuse becomes impossible.

The present invention seeks to solve these problems, and alleviates the conditions of the combination of the sealing material and the lead wire covering material, thereby widening the selection range and improving the quality (waterproofness,
It is an object of the present invention to provide an electromagnetic coil for a control valve, which stabilizes insulation properties and the like, and seals a temperature fuse operating at a low temperature with a potting material to enable use of a temperature fuse operating at a low temperature.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an electromagnetic coil formed of a resin except for a pair of terminals for external connection thereof.
After connecting each lead wire, in a control valve electromagnetic coil in which each terminal is sealed with a potting material, when each terminal is sealed with the potting material, the potting material is surrounded around each terminal. Is provided as a means for solving the problem by providing a frame for storing the resin until it is cured.

According to the present invention, the periphery of the terminal is hardened by the potting material, and the hardening is stored in the frame until the potting material hardens, so that the insulation distance can be easily secured. In addition, since the terminal is bent and an angle is set between the direction in which the terminal comes off and the direction in which the lead wire is pulled, the tensile strength of the lead wire can be ensured. Furthermore, since the terminal and the lead wire are joined after resin molding of the electromagnetic coil, housed in the storage section, and sealed with a potting material, waterproofness is maintained regardless of the combination of the resin molding material and the covering material of the lead wire. Sufficiently obtained, it is possible to improve the insulation of the electromagnetic coil. Further, according to the present invention, a potting material having a curing temperature lower than the operating temperature of the temperature fuse is selected regardless of the sealing molding temperature of the molded coil, so that it is possible to use a low-temperature operating temperature fuse. . The present invention is used in an environment where a refrigeration cycle (such as a vending machine or a dehumidifier) is constantly exposed to a high-temperature and high-humidity atmosphere, is dew-condensed by a low-temperature fluid (refrigerant), or is exposed to water droplets. It is suitable for a control valve electromagnetic coil which requires a magnetic valve.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment shown in FIGS. 1 to 15 will be described. Reference numeral 1 denotes an electromagnetic coil, and this electromagnetic coil 1 is sealed by resin molding except for the terminals 6 of the external connection portion 3. At this time, a frame 9 for pouring the potting material 12 around the external connection portion 3 and storing the potting material 12 so as not to flow down until the potting material 12 is hardened is provided.

In this manner, an insulating portion can be formed around the external connection portion 3 by using the potting material 12 having a necessary thickness as an insulator. 1 and 2, reference numeral 7 denotes a storage portion for the potting material 12, and reference numeral 8 denotes a partition. The lead wire 2 is connected to the terminal 6 by caulking, soldering, welding, and fitting of the terminals. After connecting the terminals 6, the terminal 6 is bent 90 degrees along the guide part, fixed by the lead wire fixing part 10 and the lead wire fixing part 14, and then sealed with a potting material. As described above, the terminal 6 to which the lead wire 2 is joined is folded and stored in the frame of the potting material reservoir, and is sealed with the potting material, so that the tensile strength of the lead wire can be increased. In other words, this configuration,
In other words, the direction in which the terminal 6 comes off and the direction in which the lead wire 2 is pulled have an angle, and the lead wire is fixed and reinforced by the lead wire fixing part 10 and the lead wire fixing part 14, so that
The tensile strength of the lead wire can be secured.

As shown in FIG. 3, the shape of the partition 8 of the storage portion 7 may be such that the partition is finished up to the lead wire fixing device 10 or the partition is further extended to the lower portion 13 of the electromagnetic coil 1. The potting material 12 is preferably a waterproof material in which the covering material of the electric wire is sealed with an epoxy resin or the like.
Note that the external connection unit 3 includes a storage unit 7 for the terminal 6, a partition 8,
The frame 9, the lead wire fixing portion 10, and the outer box guide portion 11 are integrally molded with resin.

As shown in FIG. 4, the lead wire 2 is attached to the terminal 6 of the resin-molded electromagnetic coil 1 in FIG. Next, the lead fixing part 14 is attached to the lead fixing part 10, and the lead 2 is fixed so as to be parallel to the central axis 15 of the electromagnetic coil 1.

As shown in FIG. 5, in order to stably store the terminal 6 of the bent electromagnetic coil 1 in the storage portion 7 and stabilize the insulation distance between the terminal and the outside, the lead wire 2 is connected to the lead wire fixing portion 10. 10 that presses against each other and functions as a stopper
1 may be provided. The potting material 1 in the frame 9
When the electromagnetic coil 2 is poured around the external connection portion and the electromagnetic coil 1 is sealed, a circumferential projection 102 may be provided on the lead wire fixing portion and the lead wire fixing component so that the potting material does not leak.

As shown in FIG. 6, the terminal 6 of the electromagnetic coil 1
Means for attaching the lead wire 2 to the terminal 6 include a method of caulking the terminal 6 and the lead wire 2 using the component 16, soldering the terminal 6 and the lead wire 61 as shown in FIG. A method of attaching by welding 71, a method of caulking the terminal 17 corresponding to the terminal 6 on the electromagnetic coil side to the lead wire 2 as shown in FIG.

As shown in FIG. 10, in order to attach the lead wire fixing part 14 to the lead wire fixing part 10 of the electromagnetic coil 1, after attaching the lead wire to the lead wire fixing part 10, the lead wire fixing part 14 is attached. A method of attaching with an adhesive, or a method of ultrasonically welding and fixing the welding rib 18 of the lead wire fixing component 14 to the lead wire fixing portion 10 of the electromagnetic coil 1 as shown in FIG. As shown in FIG. 12, a pin-shaped member 19 is provided on the lead wire fixing portion 10 of the electromagnetic coil 1, the lead wire fixing component 14 is attached using the pin-shaped member as a guide, and the pin-shaped member 19 is rivet-shaped. And may be fixed. As still another method, as shown in FIG.
A claw 141 may be provided between and the lead wire fixing component 14 to engage and fix. Alternatively, as shown in FIG. 14, the guide 2 of the lead wire fixing portion 10 of the electromagnetic coil 1 may be used.
0 and the groove 21 of the lead wire fixing portion 10 may be aligned, slid and fixed.

In the modification shown in FIG.
At the time of resin molding, a cooling fin and a portion 22 for preventing rolling are provided on a part of the outer periphery of the electromagnetic coil 1, and as shown in FIG. Is provided on a part of the outer box guide section 11 so that a cavity (void) is not formed near the outer box guide section 11 at the time of sealing molding so that the sealing material flows easily at the time of molding. It is preferable to form an angle so that air does not collect.

The surface to be adhered to the potting material may be provided with irregularities to increase the contact area with the potting material and enhance the adhesion effect by the anchor effect.

Next, a second embodiment will be described with reference to FIGS. In the second embodiment, a temperature fuse 30 is incorporated in a housing 7 for housing a pair of terminals 6a, 6b and lead wires 2a, 2b connected to the terminals 6a, 6b, respectively.

In the case of this embodiment, one lead wire (first lead wire) 2a is directly connected to one terminal 6a (the winding start side terminal of the electromagnetic coil 1: first terminal), while the other is connected to the other terminal 6a. Lead wire (second lead wire) 2b is connected to the relay terminal 39, and the other terminal 6b is connected to the relay terminal 39 via the temperature fuse 30 (the terminal on the winding end side of the electromagnetic coil 1: the second terminal). Is connected. Further, the storage section 7 is provided with a partition 33 for preventing a short circuit between the one lead wire 2a and the other lead wire 2b. The temperature fuse 30 is provided in parallel with the first terminal 6a and the second terminal 6b.

As shown in FIG. 19, the second terminal 6b
The holding member 31a of the temperature fuse 30 is provided integrally. On the other hand, the relay terminal 3 connected to the second lead wire 2b
The holding member 31b of the temperature fuse 30 is also integrally provided at 9 (the relay terminal 39 is fixed to the storage section 7).

Each of the holding members 31a and 31b is formed with slits 32a and 32b respectively engageable with the lead wires 30a and 30b on both sides of the temperature fuse 30, and the slits 32a and 32b are provided with the lead wires 30a and 30b. , A tapered opening 31c as a guide to the slit,
31d are continuously provided.

Accordingly, in FIG. 19, the temperature fuse 30 can be easily attached by pushing the temperature fuse 30 in the direction of the arrow. The lead wires 30a, 30b on both sides of the temperature fuse 30 may be caulked and attached to the holding members 31a, 31b as shown in FIG.

As shown in FIG. 17, a partition 33 is provided in the housing portion 7 between the terminals 6a and 6b, the relay terminal 39 of the coil 1 and the installation portion of the temperature fuse 30.
It is configured to prevent short circuit.

In the modification shown in FIG. 21, the temperature fuse 3
Numeral 0 is disposed in a direction orthogonal to the direction in which the lead wires 2a and 2b extend, and the partition 33 is disposed so as to completely isolate the temperature fuse 30 from each terminal.

After arranging (fixing) each of the above-mentioned members in the housing 7 in this manner, the housing 7 is
Sealed with 2. It goes without saying that a material having a curing temperature lower than the operating temperature of the temperature fuse 30 is used as the potting material 12.

According to the second embodiment having such a structure, in addition to the functions and effects of the above-described first embodiment, a function and effect that a temperature fuse that operates at a low temperature can be used can be obtained.

[0028]

As described above, according to the present invention, the following effects can be obtained. (1) The periphery of the terminal is hardened with a potting material, and the hardening is stored in the frame until the potting material hardens, so that the insulation distance can be easily secured. (2) Since the terminal is bent and an angle is set between the direction in which the terminal comes off and the direction in which the lead wire is pulled, the tensile strength of the lead wire can be increased. (3) Since the terminal and the lead wire are joined after the resin molding of the electromagnetic coil and housed in the housing portion, waterproofness can be ensured regardless of the combination of the resin molding material and the covering material of the lead wire, and the electromagnetic coil can be secured. Insulation can be improved. (4) It is possible to use a temperature fuse that operates at a low temperature.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a control valve electromagnetic coil according to a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a front view showing a structure in which the length of the partition is extended to an outer frame.

FIG. 4 is a sectional view showing a structure of the electromagnetic coil and a lead wire.

5A is a plan partial cross-sectional view showing a structure for fixing a lead wire, FIG. 5B is a cross-sectional view of a portion A, and FIG.
It is a fragmentary sectional view.

FIG. 6A is a plan view showing a structure in which a terminal attached to an electromagnetic coil and a lead wire are caulked and joined, and FIG. 6B is a sectional view of the same.

7A is a plan view showing a structure in which a terminal attached to an electromagnetic coil and an electric wire are joined by soldering, and FIG. 7B is a sectional view of the same.

FIG. 8 is a plan view showing a structure in which a terminal attached to the electromagnetic coil and an electric wire are joined by spot welding.

FIG. 9 is a plan view showing a structure in which a terminal attached to the electromagnetic coil and a terminal attached to an electric wire are fitted and joined.

FIG. 10A is a cross-sectional view illustrating a method of fixing the electromagnetic coil and the lead wire fixing component with an adhesive, and FIG. 10B is a bottom view of the same.

FIG. 11 is a bottom view showing a method of fixing the electromagnetic coil and the lead wire fixing part by welding ribs.

FIG. 12 is a bottom view showing a method of fixing the electromagnetic coil and a lead wire fixing component with a pin-shaped member.

FIG. 13 is a bottom view showing a method for fixing the electromagnetic coil and the lead wire fixing part by using a claw-shaped part.

FIG. 14A is a side view showing a method of fixing the electromagnetic coil and a lead wire fixing component by using an uneven portion, and FIG.
FIG.

FIG. 15 is a bottom view showing cooling fins of the electromagnetic coil.

FIG. 16 is a schematic view showing an outer case position and a protrusion for positioning the electromagnetic coil.

FIG. 17 is a plan view showing a state before the sealing portion of the electromagnetic coil for a control valve according to the second embodiment of the present invention is sealed with a potting material.

FIG. 18 is a cross-sectional view showing the storage section after sealing with a potting material.

FIG. 19 is a schematic view showing one example of a mounting structure of the temperature fuse.

FIG. 20 is a schematic diagram showing another example.

FIG. 21 is a plan view corresponding to FIG. 16 of the modification.

FIG. 22 is a cross-sectional view illustrating a main part of a conventional control valve electromagnetic coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2 Lead wire 2a 1st lead wire 2b 2nd lead wire 3 External connection part 4 Lead wire covering material 5 Molding resin 6 Terminal 6a 1st terminal 6b 2nd terminal 7 Housing 8 Partition 9 Frame 10 Lead wire fixation Part 11 Outer box guide part 12 Potting material 13 Lower part of electromagnetic coil 14 Lead wire fixing part 15 Center shaft 16 Caulking part 17 Lead wire side terminal 18 Welding rib 19 Pin member 20 Guide 21 Groove 22 Rolling prevention part 30 Temperature fuse 31a, 31b Holding member 31c, 31d Tapered opening 32a, 32b Slit 33 Partition 39 Relay terminal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Uchimura 535 Sasai, Sayama City, Saitama Prefecture Inside Sagimiya Manufacturing Sayama Works (72) Inventor Ken Sato 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Manufacturing Sayama Works F-term ( Reference) 5E048 AB01 CB03

Claims (8)

[Claims] An electromagnetic coil is resin-molded except for a pair of terminals for external connection, and after a lead wire is connected to each of the terminals, the terminals are sealed with a potting material. In the control valve electromagnetic coil, when sealing the terminals with a potting material, a frame for storing the potting material until the terminals are hardened is provided around the terminals. Control valve electromagnetic coil. 2. Each of the terminals is bent,
2. The electromagnetic coil for a control valve according to claim 1, wherein an angle is provided between a direction in which each of the terminals comes off and a direction in which each of the lead wires is pulled. 3. The electromagnetic coil for a control valve according to claim 1, wherein each terminal to which the lead wire is connected is bent and then sealed with the potting material. 4. A storage portion for storing the pair of terminals is provided, wherein the storage portion has one of the lead wires connected to one of the terminals and the one of the lead wires connected to the other one of the terminals. The electromagnetic coil for a control valve according to any one of claims 1 to 3, further comprising a partition for preventing short circuit with the other. 5. The electromagnetic coil for a control valve according to claim 1, wherein a protrusion for pressing a lead wire is provided on a lead wire fixing portion for sealing each terminal with a potting material. . 6. The control valve according to claim 1, wherein a circumferential projection is provided on the lead wire fixing part and the lead wire fixing part for sealing each terminal with a potting material. For electromagnetic coil. 7. The storage unit is provided with one of the lead wires connected to one of the terminals and the other of the lead wires connected to the other of the terminals. After the temperature fuse for connecting between the terminal and the other lead wire is provided, the one terminal, one lead wire, the other terminal, the other lead wire and the temperature fuse are sealed with the molded coil. The electromagnetic coil for a control valve according to any one of claims 1 to 6, wherein the coil is sealed with a potting material having a curing temperature lower than an operating temperature of the temperature fuse regardless of a stop forming temperature. 8. The electromagnetic coil for a control valve according to claim 7, wherein a short-circuit preventing partition is provided between said temperature fuse and said one terminal and the other terminal.