DE1600945A1 - Arrangement for noise suppression with liquid valves - Google Patents

Description

Days Magnus Beach in Linköping / Sweden

and
Aktiebeläget Iföverken in Bremölla / Sweden

Noise suppression arrangement "for liquid valves

The invention relates to an arrangement for noise reduction pressure "with |! liquid valves.

When a flow of water passes through an outlet valve, "for example an ordinary faucet in a water distribution system" which is a valve for the flushing water supply of the water storage tank of a water closet, a noise can often be observed, which can be of greater or lesser strength, but is usually very annoying is felt "the problem _s to reduce such noise has been addressed in recent years in various ways. the differences between the v @ rgeschlagenen solutions go to different opinions about the source of the sound back. How can you _accept? have these different Judgments also led to various theories as to the best way to solve the problem

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due to the great dynamic energy of the water flow immediately after its passage through the actual Valve is caused. As a result of this theory, efforts were made to reduce noise by slowing it down to counteract the flow of water. The decrease in the speed of the water was due to Achieved constructions that cause one or more significant changes in the direction of flow. Usually this direction was completely reversed. However, it has been found that such constructions did not provide a complete solution to the noise problem.

It has also been proposed to provide a lining made of a material in the flow channel of the valve which is insensitive to vibrations, such as a natural sponge or foam rubber. In such designs, the primary objective was not to reduce the flow velocity to bring about, but rather an absorption of pressure waves occurring within the water flow to evoke. However, these attempts did not work either led to a completely satisfactory result.

The principle on which the invention is based can be briefly as follows Outlined: When a flow of water passes through a canal, its effective cross-section

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increases in the direction of flow, the liquid can, as is well known, does not suddenly fill the entire enlarged area, especially when the speed is high the liquid is considerable or even high. This leads to cavitation phenomena. The noise then arises if the cavitation spaces or bubbles are destroyed in the further course of the flow as a result of the compression, which results from a further reduction in the available cross-section. For the sake of completeness is here added that it is of course not possible to avoid such changes in the available cross-section. This follows from the fact that in most types of valves, for example ordinary water taps , the cross-section between the valve seat and the valve body is not finally fixed but rather is in Depending on the current position of the moving Valve body changed. According to another more or less conventional assumption, all will become one Liquid channel defining walls are provided with a surface that is as smooth as possible, taking the thought Zug-lap is to avoid irregularities that could cause turbulence and in this way a noise. The inventive solution to the noise problem is based on a principle that is completely independent of the earlier theories mentioned above. Instead of trying to keep the effective cross section constant or even in flow

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to reduce direction is provided according to the invention, to enlarge this cross-section and the adjacent walls of the flow channel which determine the cross-section to equip with uneven, rough or contourless surfaces. In other words, this means that the emergence is consciously tolerated by cavitation bubbles, but that the collapse of these bubbles is controlled so that "it can take place gradually and gently, thereby avoiding or reducing the generation of noise. Controlling the Compression of the cavitation blisters consequently takes place under continuous Reduction of the flow velocity instead, which is due to the increased flow resistance as a result of the Friction generating walls is obtained.

It goes without saying that it is part of the prior art to use a flow channel whose cross section is in the direction of flow increases. It is also known, also in connection with constructions of the type just mentioned, within the area of the channel with diverging walls of rubber or similar material with an irregular To arrange surface. There is one basic one, however Difference between these arrangements and the proper one, because the effective cross-section was not increased in the first pail. On the contrary, this cross-section remained usually essentially constant or even decreased considerably because of the soft and rough material in shape

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a filter was inserted and the liquid sioh moved through a multitude of pores of the material, thereby splitting them ν into a corresponding number of thin rays was before she left the arrangement. Obviously, such constructions have a completely different point of view

based on the one on which the invention is based, which does not make use of the filter principle.

In the following, the invention will now be described in detail with reference to the drawings. However, it is already Mentioned here that the invention, although the description for practical reasons is concentrated on different fittings of a water pipe system, is also applicable, if the liquid in question is not water. It should also be emphasized that it is irrelevant whether the cross-section of the flow channel, in which the collapse of the cavitation bubbles is controlled, in front of or behind the mouth of a subsequent valve.

Figures 1, 1a, 2b, 3, 4 and 5 show axial sections by an arrangement according to the invention and each represent a basic execution form that, individually or used in various combinations, can apply as a starting point for the practical implementation of the invention.

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Figures 6 and 7 show two practical embodiments, Figure 6 is an axial section through one Mppel shows that an addition to an existing arrangement is intended to represent, whereas FIG. 7 shows a partial section through a faucet designed according to the invention from the start indicates.

As far as possible, all figures in the drawings have been given the same reference numbers for the same or one another relevant details.

In Figure 1 is an axial section drawn by an arrangement which has a valve housing 1 with two ports, namely an inlet port 2 and an outlet 3. ₅ The flow channel 4 of the inlet port 2 extends into a spherical body 5, in whose upper part it opens. The body 5 is to a considerable extent within a substantially hemispherical recess in a plug 6 which is provided with an external thread which engages with an internal thread of the housing 1, as shown in the figure, the plug 6 also has one transverse groove 7 for receiving the edge of a screwdriver, by means of which the axial position of the plug 6 relative to the spherical body 5 is changed

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can be. In all these positions, a seal is achieved with the aid of a sealing ring 8. The hemispherical one Recess in the lower part of the plug 6 is provided with a coating 9 made of a material with Properties still to be explained exists.

The liquid passing through the channel 4 is apparently towards radially outwards and then downwards diverted. This reduces the flow velocity, partly because the cross-section increases and partly as a result of the braking effect due to the increased heating, which can be attributed to the presence of the lining 9 is. In any case, it results that when the liquid emerges from the outlet nozzle 5, its cross section is considerable is greater than that of the inlet connection 2, the reduction in speed and the associated speed Expansion are complete. These changes take place essentially without generating any noise.

Between Figures 2a and 2b on the one hand and Figure 1 on the other hand there are two main differences. One is that the body 5, which carries the lining 9, is conical instead is spherical, and the other in that this body is designed and arranged so that the channel 4 leaving liquid is not deflected by 180 ° before

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it reaches the chamber communicating with the outlet connection 3. Due to the presence of the covering 9 a continuous braking is achieved in the manner just described, so that no noise-producing Cavitation phenomena occur.

The only difference between FIGS. 2a and 2b is that in the first case the lower conical surface of the body 5 runs parallel to the opposite wall of the housing 1, that is to say that ■■ *. = , / «, Whereas in the latter case ex>·;<' , w _a s means that the cross section increases more rapidly when the liquid moves past the covering 9.

FIG. 3 shows a basic form in which the increase in the effective cross section takes place in a purely radial direction (according to FIGS. 1 and 2, an axial as well as a radial flow component occurs). In order to obtain this flow pattern, the coating 9 is provided at the bottom of a flat disk which forms a part with the body 5. In Figures 2 and 3, 10 denotes a nut or a washer provided with a thread, which is used to facilitate manufacture. The thread is in engagement with a corresponding thread in the main part of the housing 1, 11 denotes the lower conical Toll of the housing 1 in Figure 2,

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According to Figure 4, the continuous cross-sectional expansion due to the interaction of the inner wall of the conical Gc housing part 11 obtained with the inserted body 5, the main part of which in this case has a cylindrical shape and a lining 9 carries in the manner described above. Also according to Figure 5, the housing 1 has a lower conical Part 11, which is connected to the inlet nozzle 2. In this example, however, the lining 9 is not on attached to an additional insert body but instead provided within the conical housing part 11 and has a central flow channel. An adjustment screw 6 cooperates with a slide 14, the passage opening en 13 and rests on a perforated disk 15, which is on the upper end face of the covering or the lining 9 applies pressure. Thanks to the elasticity of the lining material it is possible by means of the screw 6 to adjust the effective cross-section of the channel 12.

6 shows c-ynes nipple or a connecting piece that can be mounted, for example in the vicinity of a water tap and is provided in nengewinde 3a with an external thread as well as 2a. An insert body 5 with a conical shape is provided within the lower section 2, the tip of which points in the direction of flow. It is held in its position by a screw 16, the thread of which

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is in engagement with the body 5 and which extends through a hole in a narrow bridge 17 which is diametrically extends over the inlet opening and forms a piece with the housing 1. The inner wall of section 2 should be uneven or be rough. ·

The difference between Figure 7 and the figures described above is that according to the former, an inventive Arrangement is arranged within a device with which it is to interact, namely a faucet. This consists of a housing 1, which has an outlet 18 and a rotary handle 19 in a conventional manner, which with a Shaft 20 is connected, which in turn controls the position of the valve body 31 with respect to a valve seat 22. According to the invention, this latter is provided with a diametrically extending bridge 17 which has a central bore, which in turn engages a bolt 6 which carries the insert body 5 with its covering 9. Such Execution represents a practical application of the basic embodiment according to FIG. 2b.

Figure 8 gives an arrangement for use in extreme cases on, namely in those where the water pressure is high or the volume of liquid passing through per unit of time is large or these two conditions occur at the same time.

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As can be seen from FIG. 4, the insert body is 5 divided into three axially spaced apart sections 5a, 5b and 5c, each of which has a kenic Base area with a covering 9a or 9b or 9c as well a radially outwardly extending plan 22a or 22b and 22c, respectively. Sections 5a, rb and 5c become by cooperation of three coil springs 23a, 23b and 23c, which act as flexible spacers, and a slide 14 held in place, which by means of a Bolt 6 is adjustable, the lower end of which rests in a recess of the section 5c.

It should be noted that I have given various basic construction examples of the subject matter of the invention above shown and described, the invention can be modified in many other ways. The only The essential condition is that the relevant recognition is designed so that passing through it Liquid is subject to gradual expansion. The expansion point of view implies that, the effective Resistant cross-section of the flowing liquid should increase and that its determination is that the flow rate of the liquid is reduced by an intended increase in friction.

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In order to limit the dimensions of the arrangement, it is usually advantageous for the latter purpose to use a to use special insert bodies or separate Belgge made of a material that has an increased friction effect results. Various synthetic resins as well as rubber appear to be particularly suitable for this. The insert body or the coverings should generally have a rough or uneven surface. In this regard it deserves mentioning too that there is an additional advantage that the corresponding wall surfaces do not require expensive machining or require similar treatment. On the contrary, it is usually desirable to obtain a rough surface, as it is caused by a casting process.

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Claims (18)

Claims 1. Arrangement for noise suppression in liquid valves g e k e η η ζ e i c h η e t through a flow channel section in the vicinity of the valve, the in the direction of the liquid flow a continuously increasing effective cross-section, with the walls defining this section having parts that allow the flow of fluid to have a high level of friction and thus a braking effect expose. ■. 2. Arrangement according to claim 1, characterized in that the channel section in question is shaped is that the liquid passing through it receives a radially outwardly directed component of motion. 3 · Arrangement according to claim 1, characterized in that the 'determined by the outer wall (2)' Cross-section over the entire length of the channel section in question is essentially constant, while the cross-section the inner wall (5) steadily decreases in the direction of flow. . BAD ORföi'NÄL 009819/0313 4. Arrangement according to claim 2, characterized in that the walls defining the relevant duct section are essentially formed by two concentric hemispherical surfaces (5, 9) (Figure 1). 5. Arrangement according to claim 2, characterized in that g e k e η η z that the relevant channel section defining walls are essentially formed by two concentric spherical surfaces (9 »11), the tips of which are the inlet opening are facing and of which at least the outer spherical surface (1) is truncated. 6. Arrangement according to claim 5, characterized in that the two conical surfaces (9, 11) have the same opening angle ( ν- = α ¹ ) (Figure 2a). 7. Arrangement according to claim 5, characterized in that the outer conical surface (11) has a has a larger opening angle than the inner conical surface © (9) (Figures 2b and 7). 8. Arrangement according to claim 2, characterized in that the flow channel in question defining walls of two parallel, preferably flat, circular surfaces formed ^ feind, the Channel entry is in the middle of one surface and the • A 009818/0313 ^BAD ° ™ «NAL Outlet through a slot between the two surfaces is formed. (Figure 3). 9. Arrangement according to claim. 2, characterized in that the relevant channel section defining walls are essentially formed from two concentric surfaces, the inner (9) at their largest Part is cylindrical, while the outer one section forms a truncated conical surface, the tip of which is opposite to the inlet opening (4) of the channel. (Figure -4-). 10. The arrangement according to claim 2, characterized in that the flow channel in question (12) determining surface is essentially a truncated conical surface, the tip of which in the direction of the inlet opening (4) has (Figure 5). 11. The device according to claim 3> thereby g e k e η nz e i chne t that the outer vand (2) of the concerned Channel section is essentially formed by a cylindrical surface and that the inner wall (5) has a conical surface is (Figure 6). 12. Arrangement according to one of the preceding claims, characterized in that the flow channel Strö 00981870313 is divided into a number of individual branches which ^u ^ ^ ^ * are fluidically connected in parallel. 13. Arrangement according to claim 12, characterized in that each of the individual branches of walls (11, 9a; 5a, 9b; 5b, 9c) is determined, which is essentially formed by Jasreil's two concentric conical surfaces are, the tips of which face the inlet opening (4) of the flow channel (FIG. 8). 14. Arrangement according to one of the preceding claims, characterized in that the walls of
separate coverings (9) or inserts (5) are formed. 15. Arrangement according to claim 14, characterized in that the coverings (9) made of a woven textile material or a synthetic resin or rubber. 16. Arrangement according to one of the preceding claims, characterized ze! ■■ without t that the effective
Cross section of the flow channel is variable. 17. Arrangement according to one of the preceding claims, in particular claims 7, 14 and 16, which in one
Faucet is provided, characterized in that the outer wall of the channel section concerned 009818/0313 is formed by a part of the tap housing (1), while the inner wall (9) is located on an insert body (5), which is preferably from the valve seat (22) of the tap
is worn (Figure 7). 18. Arrangement according to one of the preceding claims, in particular claim 13, characterized in that that it forms a nipple which is to be provided in a flow channel on a valve or the like (Figure 6). . 00981 8/0313 Blank page