FI58554B - LJUDDAEMPARE SAERSKILT FOER VATTENLEDNINGAR - Google Patents

Description

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Patent · och raglataratyralaan '' AiwOkut utlagd och utl-fkrtfkM pubitearad 31 -10. Ö0 (32) (33) (31) atuoikau * —Begird priorkM 11.09-72

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) G 7233 ^ .2 (71) (72) Curt Lennart Hammarstedt, Nygatan 2, Alstermo, Sweden-Sweden (SE) (7 ^) Tampere Patent Office (5 ^) Silencer specifically for water pipes -

Ljuddämpare, särskilt för vattenledningar

The invention relates to a device as defined in more detail in the preamble of claim 1 for attenuating the sound flowing through a line and for adjusting the flow rate.

It is a known disadvantage that, for example, pressure waves are generated in the water supply network, which cause both noise and uneven flow when lowering the water, whereby the water flows, e.g. from the tap, by an uneven force. Another drawback is that the downflow valves cause the so-called. noise in the water supply network.

In addition, due to the uneven water flow caused by pressure fluctuations in the water supply network, water consumption increases, up to 10%, and because often a large part of the water is heated, energy consumption also increases.

It is thus, in principle, desirable that, for example, water flows evenly from the taps, regardless of the pressure in the network.

2 58554 This is especially important when the mains pressure is quite high, otherwise you must be very careful when opening the taps. Another problem is to reduce said water noise or at least to reduce it effectively. Since these disadvantages occur mainly in the same area, namely in connection with or in the vicinity of the taps, the problem is to provide a device with which the attenuation of the medium flowing through the line and the control of the flow can be advantageously carried out.

However, attempts have already been made to take these disadvantages into account and e.g.

U.S. Pat. No. 2,781,061 discloses a flow control device which roughly corresponds to the device described in the introduction. The mode of operation of this known device can be considered as a completely satisfactory step towards solving this problem. Ultimately, however, the problem has not been solved by this device, in which the installation of a short, flexible, tubular body has resulted in the required and guaranteed flow being reduced to a completely inadequate minimum, which may be sufficient for washing machines or the like for which this previously known device is intended to. However, this known device cannot be used at all, for example, in connection with the installation of a faucet belonging to the water supply network. However, the disadvantages do not remain here, as the installation of a fixed member in the fluid flow channel inside and in contact with the flexible body makes it difficult for the flexible body to fully operate, thus reducing both flow control and sound attenuation and thus completely inefficient. Furthermore, the very short structure of the flexible body means that the adjustment and, accordingly, the sound attenuation must take place mainly in a point range which has proved practically impossible to achieve if more or less satisfactory results are to be obtained.

The object of the present invention is therefore to reduce and as far as possible eliminate the above-mentioned drawbacks and to provide an efficient device as described above for both sound attenuation and flow control, which, moreover, contributes to the state of the art.

These objects are achieved according to the invention · in such a way that a device as described in the introduction complies with the characterizing part of claim 1.

The invention is further illustrated in the following description with reference to the accompanying drawing, in which Figure 1 shows a suitable installation diagram for a silencer according to the invention, Figure 2 shows a partial view of a silencer according to the invention in longitudinal section and Figure 3 shows the same silencer from left.

At one end of a metal nipple 1 with external threads is placed the ends of a plastic or rubber, flexible hose 2 and a dense helical spring 3 made of non-corrosive material, which are connected e.g. by a sleeve 4 made of plastic. In one exemplary embodiment there is a spring and hose length e.g.

750 mm, but it is by no means tied to a specific length.

As can be seen from Fig. 1, the right-hand nipple head 5 shown in Fig. 2 is intended to be inserted into the water pipe sleeve and the left-hand nipple head 6 shown in Fig. 2 to be connected to a downspout, whereby a spacer or connecting line can be used.

As can be seen from Figure 2, the sleeve 4 is more suitably T-shaped in longitudinal section, whereby the hose 2 is inserted into a smaller diameter part which is placed in the nipple together with the hose. The larger-diameter part and / or the nipple head 6 can suitably expand from the inside towards the free end surface of the nipple head 6, so that the water vortices are exhausted in this area. The sleeve has internal, 58554 axial projections 7 between which said spring head is pushed, locking under the action of friction so that the through clearance between the spring and the hose allows the flow of water. In this case, the parts 2, 3, 4> 5 and 7 are preferably pressed together.

The muffler according to the invention operates in the following way. All the water discharged from the valve must flow through the hose, part of which flows forward through the spring and part between this and the hose, whereby the outside of the hose is surrounded by standing water.

When water is drained from the line, the flowing water is then in the hose and standing outside it, creating a pressure difference which compresses the hose from the outside. This difference increases as the mains pressure increases and thus provides a permanent, very advantageous flow restriction in relation to the prevailing pressure.

The purpose of the coil spring is to prevent the hose from being compressed too much, partly at higher pressure differences and partly during the installation of the damper. In the latter case, it may happen that the hose has to be inserted, for example, through pipe bends.

The sound-absorbing effect is achieved mainly by restricting the pressure energy of the water over a relatively long distance during the laminar flow, whereby the features according to the invention correspond to the main effect. Due to the raw material and the flexibility of its structure, the damper according to the invention is mainly self-cleaning.

Experiments have shown that the attenuator according to the invention provides excellent sound attenuation values compared to devices without attenuators.

The embodiments described above and shown in the drawing are to be considered as examples only, which can be modified in many different ways within the scope of the invention and the appended claims. Thus, instead of a coil spring, e.g. a flexible plastic for a perforated or non-perforated, tubular body or a body made of several hoses or channels can be used. This can potentially be considerably shorter.

One of these ducts or hoses may also contain another medium, e.g. air, which increases the shock-absorbing effect of the damper. In order to prevent the water from standing completely between the line and the hose, small openings can be provided in the hose near the nipple, which allow a slow flow, without, however, significantly affecting the features of the invention.

Claims (7)

A silencer, particularly for water pipes, which is preferably mounted in the vicinity of a tapping valve, comprising a radially compressible tubular body (2) of flexible material having a smaller outer diameter than the inner diameter of the pipe, thereby forming an annular space between the pipe and said body , which has a length many times greater than its diameter and which body is anchored in the conduit with its downstream end, since the space between the body and the conduit is blocked in the axial and downstream direction, and means (3) are provided for the body. limiting the body's cross-sectional reduction in compression and maintaining a certain minimum basic flow, characterized in that said means (3) is constituted by an axially-permeable hollow member, which is also permeable in radial to the intermediate medium, this member (3) and the body (2) form an axial passageway, open at both ends and in cross-section, annular 8 58554 space which distances the portions (2, 3) from one another, and through which a portion of the media stream passes, and which said space becomes smaller or completely disappears depending on the pressure applied to the body. Device according to claim 1, characterized in that said means (3) for limiting the cross-sectional reduction of the body (2) consists of a preferably tightly wound coil spring. 3. Device according to claim 1 or 2, characterized in that a bushing (4) is provided as an anchoring means for the downstream ends of the body (2) and the means (3) for limiting the cross-sectional reduction of the body. in axial rib (7) for frictional arresting of the limiting member between them. Apparatus according to claim 3, characterized in that the opposite end of the bushing (4) is intended to anchor the respective end of the body (2) by means of spring cleaning, whereby the said end of the bushing is preferably reduced in its outer diameter. Device according to claim 3 or 4, characterized in that the bushing (4) is intended to be inserted into a nipple or the like (1), together with the ends fixed to the bushing of the means (3) for limiting the cross-sectional reduction of the body. and the body (2), which nipple is preferably arranged between a tap and a tap. 6. Device according to claim 5, characterized in that the end of the bushing (4) and / or the nipple (1) facing away from the media flow is extended internally to the travel surface. 7. Apparatus according to claim 1, characterized in that small radial openings are arranged in the body (2) in the vicinity of the attachment point.