JPH0617207U - solenoid - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the yield of solenoids molded with insulating encapsulant. [Structure] Bobbin 5 around which coil 4 is wound, fixed iron core 6, magnetic frame 8, magnetic plate 9 and coil terminals 10 and 1
In the solenoid assembly 3 in which 0 is assembled and molded 12 with an insulating sealing material, a terminal formed on the outer periphery of the coil winding portion 4a of the coil terminal 10 with an electrically insulating material and provided in the molding die 25. The sealing cover 11 with which the opening of the insertion hole 25a can closely contact is attached. [Effect] Since the sealing cover can prevent damage to the coil terminal and disconnection of the coil connection portion, the yield of the solenoid can be increased and the insulating sealing material does not leak during molding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid, and more particularly to a solenoid suitable for a solenoid valve.

[0002]

[Prior art]

 It has a bobbin wound with a coil, a fixed iron core mounted in the center hole of the bobbin, a magnetic frame and a magnetic plate surrounding the bobbin, and a pair of coil terminals attached to the bobbin and electrically connected to the ends of the coil. However, a solenoid provided with a solenoid assembly molded by an insulating sealing material and a movable iron core slidably inserted in the center hole of the bobbin is well known without particular exemplification. The solenoid assembly in the known solenoid described above is placed in a mold for molding and an insulating sealing material is molded.

However, in the molding of the above-mentioned insulating encapsulant by a die, in order to prevent the insulating encapsulant from leaking around the coil terminals protruding outward from the die, the die is pressed against the coil terminal. There is a need to. Therefore, there is a problem that the yield of the solenoid is poor because the coil terminal is damaged or the coil is disconnected at the coil connecting portion due to a large force directly acting on the coil terminal.

[0004]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to increase the yield of solenoids molded with an insulating encapsulant.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a bobbin wound with a coil, a fixed iron core mounted in a central hole of the bobbin, a magnetic frame and a magnetic plate surrounding them, and an end portion of the coil attached to the bobbin. A solenoid comprising a solenoid assembly having a pair of electrically connected coil terminals and molded by an insulating sealing material, and a movable iron core slidably inserted into the center hole of the bobbin, wherein: The coil terminal is made of an electrically insulating material and covers the coil connection part, and the opening of the terminal insertion hole for inserting the coil terminal provided in the mold for molding can be closely contacted. The feature is that a stop cover is attached.

[0006]

[Action]

 When the solenoid assembly is installed in the mold for molding, the opening of the terminal insertion hole for inserting the coil terminal provided in the mold covers the coil connection and covers the sealing cover attached to the coil terminal. Since it does not come into contact with the coil terminal or the coil connecting portion directly, it is possible to prevent the coil terminal from being damaged by the mold and the coil from being disconnected at the coil connecting portion. Also, since the terminal insertion hole is sealed by the sealing cover, the insulating sealing material does not leak outside during molding.

[0007]

【Example】

 The drawings show an embodiment of the present invention, which shows a solenoid valve having a solenoid 1 and a valve portion 2 whose flow path is opened and closed by the solenoid. The solenoid 1 includes a bobbin 5 around which a coil 4 is wound, a fixed iron core 6 attached to a center hole 5a of the bobbin, a magnetic frame 8 and a magnetic plate 9 surrounding them, and a base end thereof is fitted to a bobbin collar 5b. A solenoid assembly 3 having coil terminals 10 and 10 each of which has a tip protruding outside the magnetic frame 8 and sealing covers 11 and 11 which are fitted to the coil terminals 10 and 10, and the bobbin. The solenoid assembly 3 is provided with a movable iron core 7 slidably inserted in the center hole 5a, and the solenoid assembly 3 is molded with an insulating sealing material.

The coil 4 has its tip passing through the groove 14 formed in the collar 5b wound around the coil terminal 10 outside the collar 5b, and the winding portion 4a is fixed to the coil terminal 10 by soldering or welding. As a result, it is electrically connected to the coil terminal 10 (see FIG. 2). The sealing cover 11 formed of a material that is electrically insulating and has appropriate elasticity has a substantially frustoconical outer shape, and is fitted to the coil terminal 10 while covering the outer circumference of the coil winding portion 4a. Further, the magnetic frame 8 has radial inflow holes 8a, which open toward the outer peripheral surface of the coil 4, and an axial inflow hole which opens toward the space around the circumferential groove 6a of the fixed iron core 6. 8b, ... Are formed.

The valve body 20 of the valve section 2 is provided with a pressure fluid supply port P and an output port A, and a valve seat 21 formed in a flow path communicating these ports, and is provided with a movable iron core 7 of the movable iron core 7. The valve body 22 that opens and closes the valve seat 21 attached to the tip is biased in a direction to close the valve seat 21 by a return spring 23 that is contracted between the movable iron core 7 and the magnetic plate 9. There is. Reference numerals 16 and 17 in FIG. 1 denote a printed wiring board and power supply terminals for supplying power to the coil terminals 10, 10.

The solenoid assembly 3 is installed and molded in the molds 25 and 26 shown in FIG. The die 25 has a pressing portion 25a that comes into contact with the upper surface of the magnetic frame 8 and terminal insertion holes 25b and 25b into which the coil terminals 10 and 10 are inserted. It has a pressing portion 26a that contacts the end surface on the movable iron core side and an abutting portion 26b that contacts the lower surface of the magnetic plate 9. The distance between the pressing portions 25a and 26a is the axial length of the fixed iron core 6 and the magnetic frame. It is slightly shorter than the sum of the thicknesses of 8.

In the solenoid assembly 3, the center hole 5a of the bobbin 5 is fitted into the pressing portion 26a of the die 26, and the magnetic plate 9 is placed in the die 26 by abutting the abutting portion 26b. When the molds 25 and 26 are closed, the pressing portions 25a and 26a bring the fixed iron core 6 and the magnetic frame 8 into close contact with each other, and the opening edges of the terminal insertion holes 25b and 25b are the outer circumferences of the sealing covers 11 and 11. Press against the surface (see Figure 3). Therefore, since the die 25 does not directly contact the coil terminal 10 and the coil winding portion 4a, it is possible to prevent damage to the coil terminal 10 by the die and disconnection of the coil in the coil winding portion 4a. Further, since the terminal insertion holes 25b, 25b are sealed by the sealing cover 11, the insulating sealing material does not leak from the terminal insertion holes 25b, 25b. The insulating sealing material injected into the molds 25, 26 passes from the periphery of the solenoid assembly 3 through the inflow holes 8a, ... And 8b ,. It flows around the circumferential groove 6 a of the iron core 6.

[0012]

[Effect of device]

 The solenoid of the present invention, when the insulating sealing material is molded by the mold, the opening of the terminal insertion hole provided in the mold closely contacts the sealing cover fitted on the outer periphery of the coil terminal, and Since they do not come into direct contact with each other, it is possible to prevent damage to the coil terminal due to the die and disconnection of the coil at the coil connecting portion, so that the yield of solenoids can be increased. Further, this sealing cover can prevent the leakage of the insulating sealing material from the terminal insertion hole during molding.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment.

FIG. 2 is an explanatory view of a mounting mode of a sealing cover.

FIG. 3 is a vertical cross-sectional view of a solenoid assembly inserted in a mold.

[Explanation of symbols]

 1 Solenoid 3 Solenoid Assembly 4 Coil 5 Bobbin 5a Center Hole 6 Fixed Iron Core 7 Movable Iron Core 8 Magnetic Frame 9 Magnetic Plate 10 Coil Terminal 11 Sealing Cover 12 Mold 25, 26 Mold 25b Terminal Insert Hole

Claims (1)

[Scope of utility model registration request] 1. A bobbin around which a coil is wound, a fixed iron core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding the bobbin, and a pair of ends attached to the bobbin electrically connected to the bobbin. A solenoid assembly having a coil terminal of, and molded with an insulating sealing material,
In a solenoid provided with a movable iron core slidably inserted into the center hole of the bobbin, the coil terminal is formed of an electrically insulating material, covers the coil connection portion, and forms a mold for molding. A solenoid characterized in that a sealing cover is attached to which an opening of a terminal insertion hole for inserting the provided coil terminal can closely contact.