JP3429891B2 - Rotating structure of explosion-proof solenoid valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating structure of an explosion-proof solenoid valve. 2. Description of the Related Art As a conventional explosion-proof solenoid valve, there is a conventional explosion-proof solenoid valve having a structure shown in FIG. The rotating structure of a conventional explosion-proof solenoid valve is a plunger tube 10
1 and the plunger tube 101
A coil bobbin 103 fitted externally to the plunger tube 101 and a yoke 105 engraved with a notch 104 on the side wall and covered with a bottom and fitted externally to the plunger tube 101 are housed.
A coil housing 107 which rotates around the wire 102 and has a wire outlet tube 106 extending to the side, and a lead wire 108 which is led out of the coil bobbin 103, passes through the notch 104 of the yoke 105, and is connected to the wire outlet tube 106. And At the time of piping work, when trying to rotate the electric wire outlet pipe 106, the coil housing 107 is rotated with respect to the valve body 102. In the explosion-proof solenoid valve described above, when changing the direction of the wire outlet pipe 106 having a large angle, the coil bobbin 103 is rotated via the lead wire 108. The fitting between the coil bobbin 103 and the plunger tube 101 is tight, or the spring 109
When the pressing force is strong, excessive tension is applied to the lead wire 108, disconnection or disconnection of the terminal connection portion, or as shown in FIG.
0, the outer sheath of the lead wire 108 is damaged, and the insulation is deteriorated. FIG. 7 shows a conventional example in which the electric wire outlet tube 106 of the coil housing 107 is manufactured separately.
Reference numeral 112 denotes a screw portion for externally fitting the crimp terminal of the lead wire 108, and reference numeral 111 denotes an insulator. Accordingly, in view of the above circumstances, the present invention has been made in consideration of the above circumstances, and has been described as improper tension applied to a lead wire to cause disconnection, disconnection of a terminal connection portion, or damage to an insulation coating of a lead wire. In order to prevent deterioration of the performance, a valve body with a plunger tube protruding, a coil bobbin externally fitted to the plunger tube, and a bottomed cylindrical shape fitted over the coil bobbin and externally fitted to the plunger tube are cut out on the side walls. A coil housing that accommodates the installed yoke, rotates around the valve body and extends the wire draw-out tube to the side, and a lead wire that is led out from the coil bobbin and connected to the wire draw-out tube through the notch of the yoke. In the explosion-proof solenoid valve, a projection is projected from the inside of the electric wire draw-out tube to fit into the notch of the yoke, and is directed outward from the coil bobbin. The flange is protruded and fitted into the notch of the yoke, so that the coil housing and the coil bobbin can rotate synchronously to form a rotating structure of an explosion-proof solenoid valve. A coil is formed by extending a protrusion from an insulator in a wire draw-out tube, fitting the protrusion into the notch of the yoke, projecting a flange outward from the coil bobbin, and fitting the flange into the notch of the yoke. The housing and the coil bobbin can be rotated synchronously. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings. A fixed core 2 is fixed to an upper end portion in a core tube 1, and a movable core 4 urged downward by a spring 3 is provided slidably in an axial direction below the fixed core 2. A plunger tube 7 is formed by fixing to a plunger substrate 6 having a flange 5 at an upper portion. A valve body that is located between the upper valve seat 12 and the lower valve seat 8 and is urged upward by a spring 9 and has three ports of a pressure port P, an exhaust port R, and a port A; The plunger substrate 6 of the plunger tube 7 is screwed to the plunger tube 11 and the movable core 4 is moved up and down to make a valve
10 enables the upper valve seat 12 and the lower valve seat 8 to be opened. coil
The coil bobbin 17 accommodating the plunger tube 7
And a yoke 20 forming a magnetic path by a coil 16 having a bottomed cylindrical shape and a notch 19 formed in a side wall 18 is externally fitted to the plunger tube 7 to form the coil bobbin 17.
To cover. A coil housing 27 in which an electric wire drawing tube 26 is extended to the side is used to connect the plunger tube 7 to a valve body.
When it is mounted on the valve body 11, it is sandwiched between the flange 5 of the plunger substrate 6 and the valve body 11, and is rotatably mounted around the valve body 11. In order that the yoke 20 can be housed in the coil housing 27 without play, a wave washer 28 is interposed on the upper part of the yoke 20 and the cover 29 is attached to the coil housing 27.
It is screwed on the upper part. The lead wire 30 led out from the coil bobbin 17 has a crimp terminal 31 at its tip screwed into the wire drawing tube 26 with a terminal screw 32. Reference numeral 33 denotes an insulator located in the electric wire outlet tube 26. In this three-port solenoid valve, FIG. 1 shows a demagnetized state, the coil 16 is not energized, the movable core 4 moves downward by the spring 3, and the valve element 10 is moved to the lower valve seat 8. When seated, the upper valve seat 12 opens and communicates from port A to exhaust port R. When the coil 16 is energized, as shown in FIG. 2, the movable core 4 moves upward against the urging force of the coil 3, and the valve 10 moves upward by the coil spring 9 to shut off the upper valve seat 12. Then, the lower valve seat 8 is opened to operate the compressed air from the pressure port P to the port A. [0011] In the rotating structure of the solenoid valve as described above,
In order to make the coil housing 27 and the coil bobbin 17 rotatable synchronously, a projection 36 made of an insulator 33 in the electric wire lead-out tube 26 is projected and fitted into the notch 19 of the yoke 20. The projections 36 can be easily formed if they are formed simultaneously with the same mold when forming the insulator 33, and can be manufactured at low cost. At the lower end of the coil bobbin 17 housed in the yoke 20, a flange 37 that fits into the notch 19 of the yoke 20 is projected.
At the time of plumbing, when changing the direction of the electric wire outlet tube 26, when the electric wire outlet tube 26, that is, the coil housing 27 rotates, the projection 36 in the electric wire outlet tube 26 is located in the notch 19 of the yoke 20, The collar 37 of the coil bobbin 17 is also a yoke
Since it is fitted with the notch 19 of 20, the wire outlet tube 26,
The coil bobbin 17 and the lead wire 30 also rotate in synchronism with the coil housing 27, and excessive tension is applied to the lead wire 30 to break the wire and disconnect the terminal connection part, or the outer sheath of the lead wire is damaged and the insulation is deteriorated. Is gone. As described above, the present invention provides a valve body having a plunger tube projecting therefrom, a coil bobbin externally fitted to the plunger tube, and a bottomed cylindrical shape covering the coil bobbin and externally fitting to the plunger tube. A coil housing that houses a yoke with a notch cut in the side wall, rotates around the valve body, and extends the wire draw-out tube to the side, and is drawn out from the coil bobbin and passes through the notch of the yoke into the wire draw-out tube. In the explosion-proof solenoid valve composed of the connected lead wires, a projection is projected from the inside of the electric wire draw-out tube to fit into the notch of the yoke, and a flange is projected outward from the coil bobbin to fit into the notch of the yoke. The explosion-proof solenoid valve has a rotating structure that enables the coil housing and coil bobbin to rotate synchronously by combining them. The lead wire is pressed against the metal corner of the housing without disconnection due to the addition of the wire and the terminal connection portion does not come off. Further, according to the present invention, it is possible to provide an inexpensive rotating structure which does not damage the lead wire with a relatively simple structure in which a projection is projected from an insulator and a flange is projected from a coil bobbin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a demagnetized state in a specific embodiment of the present invention. FIG. 2 is a sectional view showing a state of excitation in an embodiment of the present invention. FIG. 3 is a perspective view of an electric wire draw-out tube according to the present invention. FIG. 4 is an exploded perspective view of an electric wire draw-out tube, a yoke, and a coil bobbin according to the present invention. FIG. 5 is a sectional view of a conventional explosion-proof solenoid valve in which a coil housing rotates. FIG. 6 is a plan view showing a state in which a conventional lead wire hits a metal corner of a coil housing. FIG. 7 is a perspective view of a conventional electric wire outlet tube. [Description of Signs] 7 ... Plunger tube 11 ... Valve body 17 ... Coil bobbin 19 ... Notch 20 ... Yoke 26 ... Electrical outlet tube 27 ... Coil housing 30 ... Lead wire 36 ... Protrusion 37 ... Flange

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Claims (1)

(57) [Claims] [Claim 1] A valve body with a plunger tube protruding, a coil bobbin externally fitted to the plunger tube,
A coil housing that houses a yoke with a notched engraved notch on the side wall and a bottomed cylindrical shape that covers the coil bobbin and is externally fitted to the plunger tube, and that rotates around the valve body and extends the wire draw-out tube to the side; and a coil bobbin. In an explosion-proof solenoid valve comprising a lead wire drawn out and connected through a notch of the yoke to the inside of the electric wire draw-out tube, a projection is projected from the inside of the electric wire draw-out tube and fitted into the notch of the yoke, and the outer side of the coil bobbin An explosion-proof solenoid valve rotating structure that allows the coil housing and the coil bobbin to rotate synchronously by projecting a flange toward the notch and fitting into the notch of the yoke.