JPS6028851Y2 - gas safety solenoid valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas safety solenoid valve applied to a combustion safety device for gas appliances.

A typical gas safety solenoid valve has a pole piece fixed to a base attached to the cock body, a coil is provided on this pole piece to form a magnet, and a cylindrical case fixed to the base is attached to one end. A configuration is adopted in which the valve disk is supported movably in the axial direction by a shaft to which an armature is fixed at the other end.

The pole piece consists of a U-shaped plate of magnetic material, on which two webs extending parallel to each other are wound with a coil.

Therefore, when a predetermined operating current is supplied to the coil,
When the valve disc is pushed to the open position and the armature is in contact with the tip of the pole piece, this pole piece is held in that position, but when the operating current falls below the set value, the armature and valve disc are released for return. It returns to its original position under the action of a spring, providing a safe shutoff action by closing the valve port.

This movement is accompanied by a fairly severe shock or vibration, which may cause the coil wound around the pole piece to extend in the axial direction and move to a position where its tip comes into contact with the armature, interfering with the suction of the armature. .

In order to prevent this movement of the coil, a locking member that engages with the upper end of the coil is attached to the pole piece, but in this case, the number of parts increases and the work of installing the coil is troublesome. The disadvantage is that efficiency decreases.

The object of this invention is to provide a gas safety solenoid valve equipped with a coil whose deformation can be prevented by the structure of the coil itself.

In order to achieve this purpose, this invention provides two sets of turns in a pair of webs extending parallel to each other on the pole piece in the coil wound around the pole piece.
A connecting portion is provided to connect each turn to each other at a portion located on the distal end side of the web, and an extension portion is provided from the other end of one turn to cross and engage with the connecting portion and to extend through the base. This prevents the coil wound around the pole piece from extending in the axial direction due to force or vibration.

Next, an embodiment of this invention will be described with reference to the drawings.

A cylindrical case 2 is fixed to a base indicated by reference numeral 1 in FIG. 1, and a shaft 3 is supported by the case 2 so as to be movable in its axial direction.

This shaft 3 supports an armature 4 at one end and a valve disc 5 at the other end.

Furthermore, a substantially U-shaped pole piece 6 made of a plate of magnetic material is housed within the case 2, and is fixed at a predetermined position on the base 1 by a fixing member 7.

A coil 8 is provided so as to surround a pair of mutually parallel webs of the pole piece 6. One end of this coil 8 is fixed to a suitable location on the base 1 by means such as welding, and the other end is attached to the base 1. It penetrates and is drawn out to the outside and connected to the lead wire 9.

The coil 8 is, as shown in detail in FIGS. 2 and 3,
Consisting of two sets of turns 8a and 8b wound around each web of the pole piece 6, one turn 8. The end of the turn a is connected to the start of the other turn 8b via the connecting portion 8C.

The end of the turn 8b once rises through the gap between the turns 8a and 8b, intersects with the connecting portion 8c above it, and then forms an extension portion 8d that extends downward.

This extension part 8d passes through the base 1 and the lead wire 9
connected to.

According to the gas safety solenoid valve configured in this manner, the connecting portion 8c connecting the uppermost ends of each turn of the coil 8 is held in a predetermined position by engaging with the extension portion 8d that intersects above the connecting portion 8c, Therefore, both turns 8a and 8b are pressed by the connecting portion 8c.

Therefore, even if the coil 8 is subjected to any shock or vibration, the coil 8 will not be deformed such that each turn 8a, 8b will extend in the axial direction.
There is no need to provide a separate member to prevent the coil 8 from deforming, and although the coil 8 is structurally different from a normal coil, it can be operated in the same way as a normal coil. Because it is possible to install
There is no increase in the number of parts or assembly man-hours, and it is advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a gas safety solenoid valve according to an embodiment of this invention, Fig. 2 is a plan view of a coil used in the gas safety solenoid valve of Fig. 1, and Fig. 3 is a side view thereof. . 1...Base, 2...Case, 3...
...shaft, 4...armature, 5.
...Valve disk, 6...Pole piece,
Death... Coyle, 8 at 8 b...
Turn, 8c...Connection part, 8d...Extension part.

Claims (1)

[Scope of utility model registration request] A substantially U-shaped pole piece attached to a base, a coil wound around the pole piece, a case fixed to the base, an armature and a valve disk supported movably in the axial direction by the case. In a gas safety solenoid valve comprising an attached shaft, the coil has two sets of turns each wound around a pair of webs extending parallel to each other of the pole piece, and each turn is located on a distal end side of the web. Gas safety, characterized in that it has a connecting part interconnecting the parts, and an extension extending from the other end of one turn cross-engaging with said connecting part and extending through said base. solenoid valve.