JPH0115746B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety valve system that operates against increases in fluid pressure.

Conventional safety valve devices of this kind use springs and weights as pressure control members, and when the fluid pressure applied to these pressure control members exceeds the force of the spring or the weight of the weight, the pressure control member It is configured to be displaced to dissipate fluid pressure.

However, in such a configuration, since the control member is designed to perform mechanical operation,
These components and the components that cooperate with them inevitably wear out due to rust, wear, etc. during long-term use, which has the drawback of often causing malfunctions.

The present invention aims to provide a safety valve device that can eliminate these drawbacks.

The apparatus of the present invention will be explained below with reference to the accompanying drawings. FIG. 1 shows a longitudinal sectional front view of the apparatus of the present invention. It is comprised of a non-magnetic exterior body 4 provided with a pressure dissipation section 3, a magnetic field application means 5 attached to this exterior body 4, and a magnetic fluid 6 housed in the pressure control section 2. The exterior body 4 is fixed to a pressure vessel 7 such as a pressure source containing fluid pressure so as to receive the pressure.
is provided and screwed onto the mouth end 71 of the container 7.

The pressure receiving section 1 has a pressure receiving chamber 12 enlarged above the screw port 11 so as to receive the fluid pressure of the pressure vessel 7, for example, atmospheric pressure. The applied atmospheric pressure is adjusted.

The pressure control section 2 is formed so that a magnetic gap 21 communicates with the pressure receiving chamber 12, and this magnetic gap 21 is formed sufficiently narrow with respect to the pressure receiving chamber 12 so that a strong magnetic field is generated within the gap 21. has been done.

The magnetic gap 21 is as shown in FIG.
A neck-shaped control unit 2 is created by reducing the non-magnetic exterior body 4.
It is also possible to form ferromagnetic tongues 22 and 22' facing each other on this reduced neck.
Alternatively, as shown in Fig. 3, a pair of ferromagnetic blocks 23, 23' and a pair of non-magnetic blocks 24, 24' are alternately closely packed in a wide through hole to form a gap between these blocks. Furthermore, as shown in FIG. 4, a part of the exterior body 4 may be narrowed and formed between the opposing walls 41 and 41', but as shown in FIG. It is preferable to form a serpentine shape by a pair of magnetic pieces 25, 25' whose opposing edges are formed into an uneven shape.

That is, by doing this, the total opening area of the magnetic gap 21 can be increased by increasing the length of the gap 21, so that the area for attracting the magnetic fluid 6 can be increased and the magnetic fluid 6 can be held well. This has the advantage that leakage magnetic flux from the gap 21 can be reduced and magnetic action within the gap can be improved.

The pressure dissipation section 3 includes a pressure dissipation chamber 31 that communicates with the pressure receiving chamber 12 via the gap 21 and is partially open, and a filter 32 attached to the open chamber of the pressure dissipation chamber 31. Ori,
The filter 32 is configured to stop droplets of the magnetic fluid 6 scattered within the pressure dissipation chamber 31 inside the chamber.

The magnetic field applying means 5 generates a magnetic field in the gap 21 of the pressure control section 2, and usually includes a pair of permanent magnets 51 and 52 facing each other via the gap 21, as shown in FIG. Alternatively, an annular magnet 53 as shown in FIG. 3 may be used, but in some cases, the magnet 53 shown in FIG. 3 may be used as a magnetic core and an electromagnet 54 may be provided therein.

Since the device of the present invention is constructed as described above, the pressure receiving section 1 and the pressure dissipating section 3 are normally isolated by the magnetic fluid 6, and the magnetic fluid 6 depends on the strength of the magnetic field acting on the gap 21. Thus, the gap 21 is blindly closed while having a predetermined blocking force.

In this state, if the fluid pressure from the pressure vessel 7 increases and exceeds the blocking force of the magnetic fluid 6, this pressure will cause the magnetic fluid 6 to move as shown by the chain line in FIG. , scattered,
As a result, the gap 21 opens, and the excessive pressure is dissipated from the pressure dissipation chamber 31 through the filter 32 into the outside air.

When the pressure in the pressure vessel 7 attenuates and returns to normal, the magnetic fluid 6 returns to the gap 21 and is again attracted and placed between the gaps 21, so that the present safety valve device is automatically restored to its original state. Become.

The return of the magnetic fluid 6 to the gap 21 is performed by the attraction action of the magnetic field acting on the gap 21, but if the inner wall surface of the pressure dissipation part 31 is inclined toward the gap 21 as in the embodiment, Since the scattered magnetic fluid 6 flows down toward the gap 21, there is an advantage that the return of the magnetic fluid 6 can be ensured.

Since the device of the present invention is as described above, it has the advantage that there is no wear and tear on parts as in conventional safety valves operated by mechanical operation, and the control pressure value can be controlled by the magnetism of the magnetic fluid, the magnetic force of the magnet, or the like. Furthermore, since the gap can be freely set depending on the shape of the gap, etc., there is the advantage that many types of devices with different performances can be manufactured and sold at low cost.

Furthermore, since the device of the present invention uses the magnetic fluid 6, the operation of the device has temperature characteristics.
Gap 2 when the temperature exceeds the Curie point
1 opens and the pressure is dissipated.

Therefore, this device has the advantage of being able to obtain responsiveness to temperature as well as responsiveness to fluid pressure.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the device of the present invention, FIG. 2 is a cross-sectional plan view taken along the line of FIG. FIG. In the figure, 1 is a fluid pressure receiving part, 2 is a pressure control part, 2
1 is a magnetic gap, 3 is a pressure dissipation section, 4 is an exterior body, 5 is a magnetic field applying means, 6 is a magnetic fluid, and 7 is a pressure vessel as a pressure source.

Claims (1)

[Scope of Claims] 1. A pressure receiving part for fluid pressure connected to a pressure source of fluid pressure, a pressure control part connected to the pressure receiving part, and a pressure dissipation part communicating with the pressure receiving part via the pressure control part. A magnetic gap is formed in the pressure control section, the pressure receiving section and the pressure dissipation section are communicated through the magnetic gap, and a magnetic field is applied to the pressure control section to generate a magnetic field within the magnetic gap. A magnetic fluid is housed in the gap, and the magnetic fluid is attracted and fixed in place so as to cut off the pressure receiving part and the dissipation part by a magnetic field acting on the gap. safety valve device. 2. The safety valve device according to claim 1, wherein the magnetic gap is formed in a meandering shape, thereby increasing the opening area of the magnetic gap.