JPS60146977A - Gas block valve - Google Patents

Abstract

PURPOSE:To reduce fluctuation of operating voltage by performing thermal treatment after non-electrolytic nickel galvanization as surface treatment of components in magnetic circuit of gas block valve to expose magnetic nickel thus reducing magnetic resistance. CONSTITUTION:Magnetic circuits 17, 18 for operating a valve rubber 14 is comprised of yoke 1, plunger 11 and spring 16 where non-electrolytic nickel galvanization is applied on the surface of material of yoke 1 and plunger 11 or iron then thermally treated. Consequently, iron applied with surface treatment will be magnetic material to prevent function of galvanized film as a magnetic gap thus to prevent deterioration of adsorbing force between plunger and piece resulting in elimination of fluctuation/variation of operating voltage of gas block valve, strict management of the thickness of galvanization film, facilitation of working of parts and cost reduction.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is applicable to gas appliances and gas pipes installed in gas appliances and gas piping. This relates to a gas cutoff valve.

Conventional configuration and its problems Conventional gas cutoff valve? Shown in Figure 1.

1 is a galvanized yoke made of iron plate bent into a U shape.
Permanent magnets 2 with the same polarity facing each other are attracted to the inside of both ends, and a cover 3 made of resin is further set on top of the permanent magnets 2. A beef 4 made of ferritic nutless is caulked to the bottom of the yoke 1, and a coil 7 having a through hole 5 having an inner diameter almost the same as the outer diameter of the beef 4 is attached.

The carp/L/7, cover 3, etc. are caulked and fixed to the yoke 1 by non-magnetic metal fittings 10. Reference numeral 11 denotes a plunger made of magnetic iron plated with galvanized metal, the tip of which forms a suction surface 12 with the upper surface of the beef 4, and a screw 13 of non-magnetic material is attached to the head of the plunger. A valve rubber 14 made of rubber is fixed. A spring 16 is provided below the valve rubber 14 via a valve plate 15 made of a non-magnetic material.

As a working Haramachi, with the above configuration, the magnetic circuit 17.1
8 is formed, an attraction force is generated on the attraction surface 12 so that the plunger 11 attracts the piece 4, but on the other hand, a voltage is applied to the coil 7 so that a reverse magnetic field is generated in a direction that cancels out this attraction force. In addition, the V-plunger 11, that is, the valve rubber 14, will be blown away by the repulsive force of the spring 16.

In the above structure and principle, when the tip of the plunger 11 is microscopically viewed fc, it becomes as shown in FIGS. 2 and 3. FIG.
The zinc plating film thickness t2 of the yoke 1 is shown in an enlarged manner. In this case, zinc with low magnetic permeability is interposed between the openings of the magnetic circuits 17 and 18, and A is the magnetic gap, that is, the magnetic resistance.The magnetic flux passing through the jib launcher 11, piece 4, and yoke 1 is completely reduced. As a result, the suction surface 12
This will reduce the adsorption force between the plunger 11 and the beef 4. Moreover, this magnetic gap is greatly influenced by the thickness of the zinc plating film. That is, if the attraction force decreases, the difference between the attraction force and the reaction force of the spring is small because the load on the spring 16 is constant, and the difference between the attraction force and the reaction force of the spring is small. The voltage applied to the coil 7 can be reduced. This shows that the operating voltage, which is the basic performance of the gas cutoff valve, that is, the voltage applied to the coil 7, is affected by the magnetic gap, that is, the plating film thickness. The voltage varies greatly by V depending on the thickness of the plating film, and therefore, it is necessary to strictly control the thickness of the plating film on the plunger and yoke when processing the parts of the shutoff valve. In addition, when electroplating is applied to the plunger as shown in Figure 3, the plating concentrates on the edge part, which creates a difference in the plating film thickness from the flat part, further increasing the magnetic gap and increasing the magnetic resistance. In extreme cases, the suction force would be overcome by the repulsive force of the spring, resulting in a phenomenon in which the plunger would not be suctioned.

Additionally, in order to eliminate the effects of these plating film thicknesses, it is possible to use ferritic stainless steel as the material for the plunger and yoke in the same way as the pieces, but in this case, the material is expensive and Due to the material characteristics of parts, machining may take time or be difficult, which poses many problems in mass production.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to reduce variations and fluctuations in the operating voltage of a gas cutoff valve, thereby achieving stable performance.

Structure of the Invention In order to achieve the above object, the present invention attempts to reduce the occurrence of magnetic resistance by applying heat treatment after electroless nickel plating to the surface of the magnetic nickel (nickel) as a surface treatment for magnetic circuit components. do.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows one of the embodiments corresponding to the conventional example shown in FIG. 1, and all the same functional parts as in the conventional example are given the same numbers. A feature of this embodiment is that the yoke 1 and the plunger 11 are made of magnetic iron and subjected to surface treatment. Electroless Ni-Nokel plating alone precipitates a nickel and phosphorus compound on the surface, but since this compound is not a magnetic substance, proper heat treatment (about 30 minutes at 300°C) will eliminate the phosphorus content and make the metal It becomes nickel with a magnetism of 1jt, and has strong wear resistance and hardness.

In this way, even if the iron is surface-treated, it becomes magnetic, so the plating film thickness will not create a magnetic gap as described in the conventional example, and the attraction force between the plunger and pinu will decrease. There will be nothing left to do.

In other words, variations and fluctuations in the operating voltage of the gas cutoff valve are eliminated. Moreover, electroless nickel plating is the third type of conventional nickel plating.
This method has the advantage that the non-uniformity of the film thickness as shown in the figure does not occur and the plating is uniform.

In addition to the effects of the invention, the following effects can be obtained by the present invention.

(1) Strict control of the plating film thickness is no longer necessary, and it is possible to reduce the thickness of the plating film by reducing the thickness of the plating film by 1/73.

(2) Stable performance with less variation and fluctuation in operating voltage can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, FIGS. 2 and 3 are enlarged sectional views of essential parts of the conventional example, and FIG. 4 is a sectional view showing an embodiment of the present invention. 1... Yoke, 2... Magnet, 11...
...Plunger O Name of agent: Patent attorney Toshio Nakao and 1 other masterpieces 1
Figure 3f! 1 m2 Figure 4 Figure 3

Claims (1)

[Claims] Permanent magnets with the same polarity are mounted on the inside of the yoke, which is made of iron material bent into a U shape and subjected to electroless nickel plating and then heat treatment, and a magnet is installed in the center between the permanent magnet and the inner bottom surface of the yoke. between a coil with a through hole in the part and a permanent magnet of the plunger 'Th1IJ', which is made of an iron material having a shaft part with a certain clearance with respect to the through hole, which is subjected to electroless nickel plating and then heat treatment; A self-retaining gas that is inserted into a through hole to form a closed magnetic circuit between the yoke plunger and the magnet, and a spring is provided between a valve rubber provided at the head of the plunger and the lower part of the valve rubber and the yoke. Shutoff valve.