JPH03148487A - Intermittent relieving device of impulsive wave - Google Patents

Abstract

PURPOSE: To enable the intermittent release of a shock wave to be carried out in a short interval and further a fast re-charging to be performed by a method wherein the end part of a free disc valve has such a sufficient resiliency as one to cause compressed air to pass from a compressing chamber to a charging chamber when a re- charging operation is carried out and also has such a sufficient rigidity as one to cause the valve disc to be set at its central part. CONSTITUTION: Compressed air is fed into a compressing chamber 7 to push a resilient valve disc 10 in contact with a housing 6 of the compressing chamber in a downward direction. The charging chamber 1 is filled with compressed air. Since a pressure within a tube 5 is low, the valve disc 10 is sealably pushed against the tube 5. After charging operation, the valve disc 10 is moved to its stand-still position and contacted with the housing 6 of the compressing chamber. The central part of the valve disc 10 is moved away from the inner end of the tube 5 and then air accumulated within the charging chamber 1 passes through an annular clearance indicated by S, passes through the tube 5 and is moved away from the device. The valve disc 10 temporarily becomes a state having a shape as indicated by an alternate long and short dash line. After a shock wave is removed, the valve returns a position indicated by a solid line due to its resiliency and shape recovering characteristic, thereby releasing of shock wave is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for intermittent release of shock waves in a silo or other vessel.

BACKGROUND OF THE INVENTION A device of this type is known from European Patent Application No. 202,720. The device has a valve plate which is longitudinally displaceable in its duct section and which closes off the outlet of the shock wave releasing tube or pressurized chamber. Also, another groove controlled by another valve is provided for filling the filling chamber with gas. Furthermore, a device of this type is manufactured by the French company Ermap and is known. This is because instead of a valve plate within the tube section, a membrane is clamped adjacent to the inner end of the tube, and this membrane closes off the pressurized chamber. The membrane is also provided with holes formed on the outside of the tube for shock wave release to avoid conduits for filling the filling chamber. The filling operation takes place through the pressurized chamber through an opening that also vents the pressurized chamber.

OBJECTS OF THE INVENTION The devices of the above-mentioned manufacturers have achieved considerable simplification and therefore allow easy manufacture combined with reliable functionality. The only part that is subjected to stress is the membrane, which is subject to considerable shock upon release of the shock wave, so it must be carefully designed and requires high quality materials. The only serious drawback of this known device is that, in order to guarantee reliable functioning, the pores formed in the membrane cannot be made too large and the entire supply air must pass through these pores. This means that refilling after the shock wave is released takes a very long time.

The object of the invention is to make an improvement to a device of this kind, which, while maintaining a simple construction, allows very rapid refilling, so that the release of shock waves can take place in short intervals.

(Means and effects for solving the problem) In order to achieve this object, the structure of the present invention is as follows. That is, a tube for releasing shock waves, and a tube disposed around the tube,
a filling chamber for accumulating compressed air; in the filling state it is supported by the inner end of the tube, closing the pressurized chamber on the opposite side of the tube; one side is pressurized by the internal pressure of the pressurized chamber; The other side consists of a flat sealing element which receives the pressure of the filling chamber and is lifted from the end of the tube when released, and the release is carried out by venting the pressurized chamber which communicates the filling chamber with the front pipe. , the filling chamber is capable of being filled via the pressurized chamber, an intermittent release device for shock waves in a silo or other container, the flat sealing element being a free disc valve, the end of which is capable of refilling; The pressurized chamber may also be sufficiently elastic to permit passage of compressed air into the filling chamber and sufficiently rigid to at least roughly center the valve disc. And so.

In the present invention, the valve disc is designed in connection with a pressurized chamber, i.e. during refilling, the air introduced into the pressurized chamber flows into the filling chamber almost without any resistance, but the pressurized chamber The internal opening of the tube is designed to open wide to release the shock wave when the pressurized chamber is vented after refilling. It is not important that the outer end of the valve disc abuts the wall of the pressurized chamber in a somewhat hermetic manner, and that no compressed air is allowed to flow from the pressurized chamber into the filling chamber and that during release the valve It is only important that the valve disk be lifted from the inner end of the tube without a backflow of compressed air from the filling chamber to the pressurized chamber due to possible leaks along the edges of the disk.

Examples have shown that very soft materials can be selected for the outer end of the valve disc, and that this outer end does not have to be flat when unfilled. However, it is desirable that the valve disc not be constrained around the periphery of the pressurized chamber or near the inner walls of the filling chamber, so sufficient stiffness is required to keep the valve disc centered in the device. If a very soft material is used for the valve disc for reasons of cost or for reasons of very low weight, it may be appropriate to reinforce the valve disc with support discs, e.g. Either a support disk is attached to a separate surface or a core is provided as a support disk inside the valve disk.

Upon release, the valve disc is lifted from the tube and an annular gap is opened between the filling chamber and the tube. The gas filled in the filling chamber flows out all at once through this annular gap, so that the intended shock wave passes through the tube in one direction. The annular gap through which the contents of the filling chamber are evacuated and passed during release must be designed sufficiently large to achieve the fastest evacuation without creating the slightest resistance.

Filling for a single release of the device takes place within a few seconds, since the filling cannot be restricted by narrow gaps or otherwise. Rapid refilling reduces some of the equipment required for silo discharge. Of course, for such rapid filling of the device it is possible to utilize a correspondingly large amount of air flow.

In the example, it has been shown that in order for the valve disc to remain centered, it is only necessary to roughly hold it in position. by this,
Manufacture is simplified as simple punching from moving raw material is applied to the valve disc. The very precise centering of the pressurized chamber compared to the tube is also not critical and therefore not required; even in eccentric positions, the accuracy of the device is very important since the intended sealing is achieved at each position. Fewer requirements need to be met, which can reduce manufacturing costs. Naturally, in the filled rest state, the valve disc must be sufficiently rigid to withstand the differential pressure between the pressurized chamber and the tube.

As already mentioned, the valve disc may be provided with a reinforcement, which must be lightweight due to the required low inertia. The valve disc at the bottom of such a support disc is merely a sealing means for sealing the support disc and the inner end of the tube in the filling state of the device. The simplest example is to attach the support disc to the valve disc by means of a central rivet. The support disk consists, for example, of a circular aluminum plate.

The device according to the invention may also be used in vessels and conduits that are subjected to high temperatures. It is then advisable to utilize a thin, flexible metal disc for the valve disc. Thereby, a seal is created by a temperature-resistant ring of plastic material, cork or aluminum, which is attached to the metal disk on the side facing the tube.

(Example) An example of the present invention will be described below based on the drawings. In FIG. 1, the device according to the invention consists of a tubular filling chamber l, the ends of which are respectively closed by a lower cover 2 and an upper cover 3, each of which is attached by a conventional bolt-nut connection. The tube 5 is welded to the lower lid 2, while the upper lid 3
has an opening 4. This opening can be used to attach a valve or a conduit with a valve at the end (this valve allows filling with compressed air or rapid venting), this tube 5 can be used for transportation in a silo or other container. It is used to release shock waves in order to move objects when they become stuck, stuck, or unable to move for some reason.

A pressurized chamber 7 is formed under the upper lid 3 by a pressurized chamber housing 6 . The lower part of this pressurized chamber housing is closed off by a valve disc lO. The wall surface 8 of the pressurized chamber 7 serves as a support surface for the valve disk 1G during the release of the shock wave, and therefore is a flat surface without sharp protrusions.

The devices according to the embodiments shown in the drawings can be installed singly or in groups at predetermined locations on the inside wall of a chimney, a supply container or a silo. These devices release a powerful pressure flow in the form of a shock wave, causing the object to move again. In order to release such shock waves, the following equipment is required.

The compressed air is introduced into the pressurized chamber 7 through the valve and pushes the elastic valve disc lO in contact with the pressurized chamber housing 6 downward, so that the passage gap is opened. In this way, the filling chamber l is filled with compressed air, whereby the valve disk lO is increasingly pressed sealingly against the inner end of the tube 5, since the counterpressure in the tube 5 is low. After filling, the valve disc 10 moves into the rest position shown, with its outer edge touching the pressurized chamber housing 6 somewhat softly. 'There may be residual gaps or small openings at this contact location; it is only required that there are no openings that are too large.

When a shock wave is released by the device, the aforementioned valve is actuated, whereby the pressurized chamber 7 is suddenly vented. Due to the loss of counterpressure, the valve disc lO is moved in the direction towards the pressurized chamber wall 8 by the air pressure filling the filling chamber l, which of course causes the central part of the valve disc lO to move away from the inner end of the tube 5. Lifted away. The air accumulated in the filling chamber 1 passes through an annular gap indicated by S,
It then leaves the device via tube 5 and enters the directed stream. The valve disk IO temporarily assumes the shape shown by the dashed line. After the shock wave has passed, the valve disc IO returns to the position shown in solid line due to its own elasticity and shape recovery. The release of the shock wave is now complete.

The area of the annular gap S must be determined in such a way that it corresponds approximately to the cross-sectional area of the tube 5; maintaining a rapid discharge from the filling chamber 1 through the tube 5, no stagnation occurs at this location; The light weight of the valve disc IO ensures a very rapid opening of the inner end of the tube 5 in the case of release, which allows very good results to be obtained.

On the one hand, the shock wave leaving this device is very powerful, and on the other hand, its range is quite large.

In the illustrated embodiment, the filling chamber 1, the tube 5 and the valve disk IO are circular and arranged concentrically with respect to one another. This need not necessarily be the case; if the installation requires conditions or other reasons to be rectangular or square, these can also be used. Irrespective of the shape in each case, the valve disc lO is not bent (unstressed) except for the pressing of the end of the tube in the rest state after filling and the slight bending during emptying of the filling chamber l. It is clear that it is the same as

Therefore, the cheapest materials and the simplest embodiments can be selected, resulting in low manufacturing costs.

In the embodiments in FIGS. 2.3 and 6, the valve disk 10 has a support disk 11 on the pressurized chamber 7 side, which is secured by a clip 20. In the embodiment shown in FIGS. Furthermore, a spring washer 21 can be provided to prevent the valve disk lO from coming off the clip 20. In this embodiment, the valve disk lO is centered together with the support disk 11 by a filling chamber l made as a welded structure consisting of a tube and a flange. The pressurized chamber 7 has an inclined part 1
5 is formed by a pressurized chamber housing 6. Also. This function is the same as described above, the valve disc lO is integral with the support disc 11 and, when released, is lifted entirely from the inner end of the tube 5.

The embodiment shown in FIG. 3 differs from the previously described embodiments, in particular in that the pressurized chamber housing has a simple ring-like shape. During the release, the support disk 11 hits the top cover 3 of the filling chamber l, but this does not have any negative effect. The elastic valve disc l◎ is supported inside the pressurized chamber housing 6 in the form of a ring and returns to the state shown during refilling.

In FIG. 4, a clip 20 is shown to better show details.
The valve disk 10 and the support disk 11 are shown integrated by a spring washer 21. In the embodiment shown in FIG. 5, the supporting disk 11 is completely enclosed and the side facing the pressure surface 7 is also completely covered by the elastic material of the valve disk. Therefore, this embodiment is most suitable for a completely flat pressurized chamber 7. This attenuates the impact upon release.

The embodiment shown in FIG. 6 differs from the previous embodiment only in that the valve disc IO is supported by a support ring 22 on the opposite side of the pressurized chamber 7. The embodiment shown in FIG. Support ring 22
are welded to the filling chamber 1 and carry on their outer periphery parallel to each other openings 23 for introducing air into the filling chamber 1 during refilling. If necessary, the valve disc lO may be allowed to bend slightly between the inner ends of the tube 5 and the support ring 22 due to the pressure during the refilling operation, so that the outer end of the valve disc lO The section is slightly arched inward. In this way, the opening 23 is opened.

The valve disc lO is made of a highly elastic material,
After refilling, it returns to the position and shape shown in FIG. The same holds true while the valve disc IO is being lifted Cf out of the tube 5 after release. While being lifted in this way, the outer end of the valve disc lO is pulled slightly inwardly; however, this outer end remains within the area of the support ring 22 so that it can maintain its approximate position. It's staying. Also shown in FIG. 6 is a modification of the fastening of the support desk 11 to the valve disk IO, thereby showing that in this location all possible fastening means can be used.

This device is usually used only when necessary, as the air consumption is quite high and compressed air is quite expensive. A considerable advantage of the device is that in the rest state the valve disc lO closes the pipe 5, so that no dust in the silo or container can enter the device. Deposits within the tubes are harmless and do not remain for long periods of time. These deposits are blown away at the latest during the next release of the shock wave.

(Effects of the Invention) As is clear from the above, according to the present invention,
It is possible to provide an intermittent release device for shockwaves that is simple in construction and allows for very rapid refilling so that shockwaves can be released at shorter intervals.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic cross-sectional view showing a first embodiment of a device made of a tube according to the present invention, FIG. 2 is a cross-sectional view showing the upper part of the device of a second embodiment of the present invention, and FIG. 4 is a sectional view showing the upper part of the device corresponding to FIG. 2, and FIG.
5 is a detailed view corresponding to FIG. 4 showing the coated support disk, and FIG. 6 is a partial sectional view of a fourth embodiment according to the invention. be.

l...Filling chamber, 4...Opening, 5...Pipe, low...
- Pressurized chamber housing, Fu pressurized chamber.

8... Wall surface, lO - Valve disk 11 - Support disk Patent applicant: Horashu Company (and 2 others) 1 row 1 F16.4 F16.5 . 11

Claims (11)

[Claims] (1) A tube for releasing shock waves, a filling chamber disposed around the tube and accumulating compressed air, and a pressurized chamber on the opposite side of the tube, supported by the inner end of the tube in the filled state. closed,
It consists of a flat sealing element, one side of which is under pressure due to the internal pressure of the pressurized chamber, the other side outside the tube is under the pressure of the filling chamber, and which is lifted from the end of the tube when released, the filling chamber and the tube In a device for intermittent release of shock waves in a silo or other container, the release is accomplished by venting the pressurized chamber communicating with the flat surface, and the filling chamber can be filled via the pressurized chamber. The sealing element is a free disc valve, the ends of which are resilient enough to allow the passage of compressed air from the pressurized chamber to the filling chamber during refilling, and at least roughly centered on the valve disc. An intermittent shock wave release device characterized by having sufficient rigidity to 2. The intermittent shock wave of claim 1, wherein each of said pressurized chamber and said filling chamber surrounds an end of said valve disk that is not guided by other means. release device. (3) An intermittent shock wave release device according to any one of claims 1 to 2, characterized in that the valve disk carries a reinforcing material in its central portion. 4. The intermittent shock wave release device of claim 3, wherein said reinforcement is a separate support disk remote from said tube and secured to said valve disk. (5) The intermittent shock wave release device according to claim 4, wherein the support disk is made of a plastic material or a light alloy. (6) Intermittent release of shock waves according to any one of claims 4 to 5, characterized in that the end of the support disk facing the pressurized chamber is chamfered to match the shape of the pressurized chamber. Device. (7) The intermittent shock wave release device according to claim 1, wherein the valve disc (10) is made of plastic material or rubber. (8) The intermittent shock wave release device according to claim 7, wherein the valve disk has a cloth filling material. (9) The intermittent shock wave release device according to claim 4, wherein the valve disk is made of a core plate of steel, aluminum alloy, or polymer-coated hard plastic. (10) During shock wave release, the gap area between the end of the tube and the valve disk is at least as large as the cross-sectional area of the tube. Intermittent release device. 11. The above-mentioned claim, characterized in that the valve disc consists of a thin, flexible metal plate carrying a temperature-resistant sealing ring of plastic material, cork or aluminum alloy for sealing the tube. 2. The intermittent shock wave release device according to 1.