JPS5824674A - Pilot safety valve - Google Patents

Abstract

PURPOSE:To cause valve opening action with at the time of energizing good response but without shock release, in a pilot safety valve which is opened or closed by the electromotive force of a thermal element, by coupling the spindle of the valve to a permalloy part through an elastic material. CONSTITUTION:A pilot safety valve comprises a seat 11, a spring 13, a spindle 14, a permalloy part 16, a magnet 17 and a magnet holder 20. To couple the spindle 14 and the permalloy part 16 to each other, the male screw 16a of the spindle at one end is inserted through the hole 16a of the permalloy part and placed in the recess 16b of the permalloy part, a shock-absorbing rubber ring 21 is provided on the bottom of the recess, a push plate 22 is provided on the rubber ring and a nut 23 is engaged with the male screw and tightened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pilot safety valve used in a pilot safety device built into a gas bath, a gas instantaneous water heater, or the like.

The conventional pilot safety valve, which opens and closes the gas passage using the electromotive force of a thermal element, has a pulp rod (1) and a permalloy (illusion) connected by a caulking part (la), as shown in Figure 1, and a pulp rod (λ). ) and permalloy (2) was extremely difficult to manage.
At K, the adhesion surfaces of the magnet (3) and permalloy (2) did not come into close contact, resulting in poor adsorption. Also, if the gap in item 1 becomes Q, 5m11 or more, the shock will come off. This is because force is applied to the valve rod (1) due to the reaction force of the barb (4) that eliminates the pushing force on the valve, and the valve rod (
1) moves through the gap in the Toki, and an impact force is applied to Permalloy (2). This impact force acts in the direction of separating the permalloy (2) from the magnet (3), and separates the permalloy (once it has been adsorbed) from the magnet (3).Therefore, it is necessary to manage the above-mentioned gap to about (LX''Im). This management was extremely difficult.Figure 2 (A) to (C) Km
(B) shows the state in which the gas passage is closed, (B) shows the state in which the valve rod (1) is pushed as much as possible by the d cam, and (Q shows the state in which the shock has been removed). 1) is released and the pulp rod (1) collides with the permalloy (1).At this l''), a shock is generated due to the impact force F between the pulp rod (1) and the tobermalloy (2). Disconnection occurs. Further, FIG. 3 shows the change in the adsorption current due to the gap between the valve rod (1) and the permalloy. In FIG. 13, when the gap is X, the suction current may be h, but when the gap is large and Y, the suction current becomes IY, which requires an extra △■ length. This means that as the adsorption current increases, the adsorption time increases.

The present invention has been devised to address such problems, and the present invention will be described below based on drawings showing embodiments. First thing first! To explain based on Figures 4 and 5 showing the Jl example, casting is the valve seat, (b) is the valve seat holder, ring is the pulp spring, ■ is the valve rod, fist is the pulp rod guide, and fist is the valve seat holder. It is permalloy. Also, the reference symbol is a magnet, a14 is a magnet coil, 1111 is a case, and - is a magnet holder. As shown in Fig. 5, the connection between the valve rod (2) and the permalloy (n) is achieved by passing the male threaded portion (na) at one end of the valve rod through the through hole (16m) of the permalloy cover and through the through hole (tSa).
) is located in the recess (16b) formed in Permalloy 11II so as to communicate with the recess (tab).
), one end of the valve rod ## is male threaded so as to press the shock-absorbing rubber ring 1 that comes into contact with the inner bottom surface of the valve rod 1 and the presser plate that comes into contact with the rubber ring against the inner bottom surface side of the recessed part (x@b). This is done by screwing a nut into the part (14a). The movable gap between the pulp rod fist ◆ and the permalloy ll4 is QW, but the opening #( 1@c) can swing ±θ0, and the adsorption surfaces of the magnet 15 and permalloy tt* can be brought into close contact. Since the gap is 0I111+, shock dislodgement does not occur, but even if it does occur, it can be prevented by the shock absorbing rubber ring.

Next, an explanation will be given based on FIG. 6 showing an example of the second dormitory.

That is, in the second embodiment, a small-diameter neck (14b) is formed at one end of the valve rod #4, and a ring-shaped plate is provided between the inner bottom surface of the recess (llb) of the permalloy fist and the neck (14b). A spring is interposed. In this second embodiment as well, the movable gap between the valve rod and the permalloy #i tonneau is 0. 1-) opening surface (16
C) can swing by ±θ0, and the magnet and permalloy adsorption surface can be brought into close contact.

Also, since the gap was 01 m, no impact force was generated.

There will be no shock loss.

The pilot safety valve of the present invention can be implemented as described above, and the following effects can be obtained.

■The larger the gap between the valve rod and permalloy, the more
As shown in the figure, a large adsorption current is required and the adsorption time is also long, but the present invention does not have the above-mentioned gap and adsorption occurs in a short time, significantly improving usability.

■There is no shock dislodgement, which greatly contributes to improving the quality of safety valves.

■When manufacturing a safety valve, there is no need to manage the valve rod and permalloy, making manufacturing extremely easy and contributing to a reduction in yield. ■No need for the rounding inspection process for shock removal, reducing costs. 0

[Brief explanation of the drawing]

Figure 1 is an overall cross-sectional view showing a conventional example, and Figures 2 (A) to (Q
3 is an enlarged cross-sectional view of the main part for explaining shock dislodgement in the conventional example, FIG. 3 is a graph showing the relationship between the gap between the valve rod and permalloy and the adsorption current, and FIG. 4 is an overall cross-sectional view showing the first embodiment of the present invention. 5 is an enlarged sectional view of the same essential parts, and FIG. 6 is an enlarged sectional view of the essential parts showing a second embodiment of the present invention. (B)...Valve seat, (B)...Valve seat holder, (To)...Valve spring, ■...Valve rod, (1 shaft)...Male thread at one end, (14b)
...Neck, body...Valve rod guide, Ill...
・Permalloy, (16a)...Through hole, (16b)・
...Recessed part, (1sc)...Opening surface, @...Magnet, I...Magnet coil, -...Case, -
...Magnetic holder, Keto...Rubber ring, (2
)...Press plate, (2)...Natsuto (Foundation)...
Leaf spring agent Yoshihiro Morimoto Figure 3 (lref 90-, l-t permallo 4L kui HE high 2nd
Figure 4 /it

Claims (1)

[Claims] 1. A pilot safety valve that opens and closes a gas passage by the electromotive force of a thermal element, characterized in that a pulp rod and a permalloy are connected via an elastic material as a movable gap between them.