FI106220B - Vacuum drainage system - Google Patents

Abstract

A vacuum drainage system comprising a waste-matter- receiving unit 1, from which waste matter is transported to a waste pipe 4, 7 by means of underpressure generated by an ejector 5. In order to ensure emptying of the said unit 1, a vacuum is generated with the ejector 5 essentially for the whole of the time that the discharge valve 3 between the said unit 1 and the waste pipe 4, 7 is kept open. <IMAGE>

Description

106220

VACUUM SEALING SYSTEM - VACUUM HOTLOPPSSYSTEM

The invention relates to a method for operating a vacuum sewer system according to the preamble of claim 1.

In a vacuum sewer system, the sewer pipe must be kept in a vacuum state in order to provide transportation of waste material typical of a vacuum sewer system. Such vacuum sewer systems are described, for example, in US 3,629,099, US 4,184,506 and US 4,034,421. However, known solutions are relatively complex and expensive.

It is also known to use ejectors to generate vacuum in a vacuum sewer system. US 4,034,421 describes a system with a liquid-powered ejector at the end of a sewer pipe, which generates the vacuum required for transporting waste material 15. This known arrangement is expensive because a separate circulation pump must be used to operate the ejector. Also, the efficiency of vacuum development is low, only about 5%. In addition, the operating medium fed to the ejector is untreated waste, which places special demands on the circulation pump and the ejector, for example, purification, etc. The use of a second fluid-20 fluid as a working medium would be possible, but would require a «4: vehicle to maintain excess fluid storage.

US 4,791,688 describes a system similar to US 4,034,421, which additionally utilizes additional external air storage to ensure transport of the waste material.

Other vacuum sewer systems are disclosed in SE 506 007,. ···. US 5,813,061 and US 5,873,135. In these known systems, sewer pipes • · ·. ** ·. The vacuum required in the sump is generated by an air-operated ejector which is · · · t - *. f formed as an integral part of the sewer pipe, which is located relatively close to the respective unit intended for drainage in the sewer pipe. Such a unit may be a toilet vessel, the outlet of which is normally connected to a vacuum sewer via a normally closed drain valve. These solutions are simpler • · • · 2 106220 and have fewer components than the systems described above. Nonetheless, these solutions require large volumes of air and also produce a considerable level of noise.

It is an object of the invention to provide a method of operating a vacuum sewer system 5, which avoids the above drawbacks and achieves improved vacuum development, reduced operating fluid consumption, i.e., air consumption and reduced energy consumption, and a lower operating level. This object is achieved by the method of claim 1.

The basic idea of the invention is to ensure reliable operation of a vacuum sewer system. In a vacuum sewer system, the development of a vacuum is a major measure, but malfunctions at the discharge end of the vacuum system must also be avoided. This is effected effectively by ensuring the combined effect of the system vacuum and the pneumatic pressure at the discharge end of the system, which can be achieved by producing a pressurized drive medium, for example compressed air, for a period of time substantially comprising performing a flushing cycle. To ensure drainage, compressed air can be supplied, if desired, for a predetermined time after the drain valve is closed.

Preferably, compressed air is supplied briefly after closing the drain valve * c * · t to ensure sufficient drainage of the waste material.

However, with respect to compressed air consumption, it may be advantageous to interrupt the supply of * · ♦ • · · just before closing the drain valve, which is sufficient in most cases.

• · «• t» 25 In a vacuum drainage system where a vacuum drainage system is used ** ·. the downstream portion of the lubricating tube, in the zone where the operation of the ejector causes underpressure, further comprises an internal flexible hose member, the outer surface of which is opposite to the wall of the surrounding tube portion, and in said zone

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It is preferable that the operating medium, i.e., 30 pressurized air, is introduced from the inlet of the operating medium, i.e., compressed air, and is supplied through the inlet between the outer surface of the flexible hose member and the surrounding pipe; is performed during the time period before the drain valve is opened. This results in a shrinkage of the vacuum sewer pipe downstream of the zone where the vacuum is generated, which enhances vacuum generation and reduces air consumption.

Preferably, pressurized air is supplied at an excess pressure in the range of about 0.0 to 2.0 bar, preferably in the range of 0.0 to 0.7 bar. The overpressure level can be selected based on the wall thickness of the flexible hose member and the desired degree of contraction.

Preferably, the pressurized air is supplied during the flushing cycle during which the contraction is most effective, i.e. during the generation of the vacuum, i.e. before the drain valve is opened.

The invention also relates to a vacuum system according to claim 7, wherein the method according to the invention can be applied. Preferred embodiments of the vacuum sewer system are set forth in claims 8-13.

The invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which Figure 1 is a general diagram of a compressed air system applied to a vehicle unit, Figure 2 is a vacuum drainage system, v: 20 is a sectional view of a safety valve for such a system; Figure 4 shows an axial sectional view of the ejector, Figure 5 shows a side view of the hose member forming part of the ejector of Figure 4, Figure 6 shows an end view of Figure 5 • · · in 25 points, and. · * ·. Fig. 7 shows a diagram of the interconnected v · ♦ ♦ *** 'of a vacuum sewer system.

• · ·. , * · *, The compressed air system according to my figure, in this case, applied to the transport unit 30, for example a train car, comprises a compressor 31, a compressed air reservoir 32, a pipe system 33 for distributing compressed air

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from the compressed air reservoir 32 to a plurality of drive units in the train, the pre-· · · · 4 106220 for the brake unit 34 connected to the wheel unit 35, the door opening and closing mechanisms, i.e. the door actuator 36, etc .. The vacuum drainage system -7, may be adapted to be connected to such a compressed air system. Reference numeral 11, which is used in the following, respectively, denotes the introduction of the operating medium, in this case a pipe, which connects the compressed air system to the vacuum drainage system for supplying compressed air to the ejector forming part of the vacuum drainage system. The invention does not require additional costs for a compressed air system, which generally has a capacity sufficient for the limited use required by a vacuum sewer system. Compressed air capacity, if needed, can easily be increased by an additional compressed air tank or by expanding an existing tank.

If for some reason it would be more practical to use a medium other than air, for example a gas, gas mixture or liquid, as a delivery medium in the ejector, this may well be accomplished within the scope of the present invention.

In Fig. 2, reference numeral 1 denotes a waste receiving unit, for example a toilet vessel, whose drain opening 2 is normally closed by a drain valve 3. The drain valve may be, for example, a valve of the type described in US 4,713,847, slider valve, ball valve, <: valve or equivalent. The upstream side of the vacuum sewer pipe comprises an upstream portion 4 of the sewer pipe tfl, which is directly connected to the drain valve 3. To drain the toilet vessel 1 ♦ · ♦, a vacuum is created in the upstream part of the The upstream. Downstream of the ejector 5, the drain pipe comprises a downstream part 7.

. ·· ♦. The downstream part of the drain pipe does not form a vacuum drain because it is on the ··· 5 pressure side of the ejector. The downstream part 7 of the sewer pipe may result in the desired • · ·. «*. to the target, preferably outside the vacuum system and to the atmospheric condition. By way of example, the downstream part 7 may lead to a collecting tank 6. The collecting tank 6 is y .. '30 outside the vacuum system and in a pressurized state through the aeration valve 6a • ·.

• · • ♦ 106220 To empty toilet bowl 1, the user may use button 8 or other suitable device to send a signal to control center 9 which controls all system functions. For example, the trigger system may also be pneumatic. The control center 9 opens the remote control fluid supply valve 5, i.e. the air supply valve 10 connected to the ejector 5, whereby the pressurized air flows into the ejector 5 from the pipe 11 connected to the compressed air system. the desired vacuum level, i.e.. a pressure reduction in the order of about 10% to 50%, preferably about 10 to 25% to 45% (corresponding to about 0.10 to 0.50 brush for 0.25 to 0.45 bar) is achieved in the upstream part 4 of the sewer pipe, the drain valve 3 opens rapidly, and the ambient air pressure in the toilet vessel 1 immediately causes the contents of the toilet vessel 1 to be pushed upstream of the sewer pipe 4. The ejector 5 still operates 4 through. At the same time, the ejector 5 blows the downstream part 7 of the drain pipe from any liquid or dirt that may be present therein. The pneumatic pressure generated by the ejector 5 in the downstream part 7 of the drain pipe contributes to the transport of the waste material through said downstream part.

When the ejector 5 is in operation and the drain valve 3 is open, the desired amount of rinse aid is also supplied to the toilet vessel 1 so that the toilet bowl; ; The inner surface of the Tian is cleaned. This operation is not described in detail as it is well known in the art and does not in itself affect the application of the invention.

Advantageously, the system may also be provided with an arrangement to protect the system from unwanted pressure shocks.

. ···. First, the upstream part 4 of the drainage pipe can be provided with a pressure sensor. With a pressure 17 at the upstream portion «··, · *«, 4, the pressure sensor 17 rapidly turns the air supply valve 10 and thereby stops

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* «* ....: feeding the man into the ejector 5. Such pressure shocks can occur when the transport of waste material 30 causes a temporary obstruction or retardation downstream of the ejector: ·! ·. a. In such a situation, the operation of the ejector rapidly increases the pressure in the drain pipe, and this increase in pressure may pass from the ejector upstream to the toilet bowl which is connected to the drain pipe during flushing, and may result in an undesired pressure stroke or return flow. This problem is avoided by stopping the ejek-5 market and reducing pressure simultaneously.

An alternative arrangement for similar situations may be a safety valve. Figure 3 shows a simple safety valve in the form of a flexible hose 12. The hose 12 is surrounded by a protective tube 13 and is bent about 90 ° to form a fold 14 or a bend. The hose remains bent by the weight of the hose member to the right of the folding 14 of the joh-10 support. The inner part of the hose 12 is connected through the opening 15 to the interior of the upstream part 4 of the drain pipe. The folding 14 completely closes the hose 12 thus acting as a non-return valve, since the outside air pressure closes the folding, especially when the pressure outside the hose is higher than in the interior of the upstream part 4. If over-15 pressures are present in the upstream part 4, the hose 12 is under the effect of this pressure and, as a result, straightens to the position 12a shown by dashed lines. In this position 12a, an opening 14a opens, thereby forming a flow path at the point where the hose is normally closed by a fold 14. The overpressure can then be released through the opening 14a. The protective tube 13 has an extension 13a which connects it in a convenient manner to the downstream part 7 of the drain pipe 7, as shown in Fig. 2, or directly to the collection container 6 or other desired object in a manner that allows gravity; . earth-based flow.

It is, of course, possible to use a combination of the above arrangements to increase the reliability of the operation.

As will be explained in more detail in connection with Figure 7, the ejector 5 may preferably be closed shortly before or shortly after the closing of the drainage brick 3. During this time, the waste material reaches and bypasses the ejector 5. As the waste material is transported forward by ambient air pressure, it is important that the drain valve 3 is kept open for a sufficient period of time so that a sufficient amount of air flows through the outlet 2 of the toilet bowl 1. When the drain valve 3, after emptying the toilet bowl 1, is closed again, the control center 9 keeps it closed preferably for a predetermined time to ensure that all waste material is discharged from the downstream drain section 7, for example to the collecting tank 6, before the next rinse cycle is started. .

Figure 4 shows a preferred embodiment of the ejector 5 of the invention 5. The upstream section 4 of the drain pipe forms an angle of about 135 ° with respect to the downstream section 7 of the drain pipe. In the embodiment shown, the upstream part 4 is substantially horizontal and the downstream part 7 is inclined downward. It is also conceivable that the upstream portion 4 and the downstream portion 7 of the drainage pipe are substantially parallel, but at different planes and / or 10 different vertical planes, wherein the upstream portion 4 of the drainage pipe is slightly upstream of the ejector 5. However, the embodiment shown in Figure 4 has proven to be advantageous in terms of operational reliability.

However, the ejector can be designed in different ways based on the following principles. If the suction tube is connected to the outlet at an angle, it is convenient that the upstream portion of the drainage pipe connected to the ejector and the downstream portion of the drainage pipe downstream of the ejector form an angle of at least about 120 °, preferably at least 135 °. At smaller angles, there is a greater risk of interference with the waste stream through the sewer pipe. If the sewer pipe passes substantially linearly through the ejector and the operating medium <f% is fed either through the annularly arranged nozzles in the sewer pipe or through the outside of the sewer pipe through the pipe wall, the nozzle extending through the nozzle, with control surfaces that eliminate the risk of waste material sticking to the nozzle member or its attachment members in practice.

*** The operating medium of the ejector 5 is compressed air supplied to the ejector ··· · “*: via a pipe 11 at a dynamic pressure in the range of about 3 to 10, preferably in the range of about 4 to 6 bar. It is fed into the ejector 5 from an opening at the end of the pipe 11 having a diameter of only about a few millimeters, for example less than 5 mm, and flows mainly in the longitudinal direction of the downstream part 7 of the drain pipe: v. direction. Immediately downstream of tube 11, the operation of the ejector generates • · 8 106220 vacuum which includes a zone comprising a tube portion 16 a few tens of centimeters long. Approximately in the central part of this zone, in the longitudinal direction, is a flexible rubber hose member 18, the outer surface of which is opposite the wall of the surrounding tubular member 16.

5 In the region of this zone comprising the hose member 18, the tube portion 16 is provided with an inlet 19, which is connected to the tube portion 11a to provide pressurized air. This pipe section 11a is guided from the pipe 11 which connects the compressed air system to the vacuum drain system, upstream of the air supply valve 10.

A space 26 (indicated by dashed lines in Fig. 4) may be formed between the outer surface of the flexible hose member 18 and the wall of the surrounding tubular member 16 for shaping the hose member 18, e.g. a pressure chamber, by means of pressurized air from the pipe section 11a through the inlet 19. Preferably, the tube portion 11a is provided with a pressure regulator 24 and a three-way shut-off valve 23. The shut-off valve 23 is provided with means for venting the tube portion 16 into the environment in its closed state. The pressurized air is supplied to the outside of the flexible hose member 18 and into the space 26 to modify, i.e. constrict, the flexible hose member more effectively than would be the case under the reduced pressure or vacuum within the flexible hose member alone. The shut-off valve 23 communicates tf '20 with the control center 9 and thus the pressure can be produced as such by the flushing cycle; / during the period when the reduction of the flexible hose member is most advantageous, i.e. when l.; the vacuum development has started and until the drain valve 3 is opened. The pressure regulator 24, connected in series with the shut-off valve 23, is used to control the pressure around the flexible hose member 18. The pressure is preferably adjusted at an overpressure of from about 0 to about 2 bar, preferably from about 0 to about 0.7 bar, depending on the overall dimensioning and fitting of the vacuum sewer system.

Pressurized air, as described above, is supplied around the flexible let-down rack 18 by a pipe section 11 from an inlet port 19 in the wall of the pipe section 16 and is supplied at the same time as the air supply valve 10 opens, The pressure is maintained by the flexible hose member 18 until the drain valve 3 is opened, whereby the shut-off valve 23 is closed, leading to aeration of the tube member 16 9 106220 (see Fig. 7, with compressed air surrounding the flexible hose member 18). indicated by a horizontal bar 23a). The maintenance of pressure through the air supply valve 10 from the pipe 11 is terminated shortly before or shortly after closing the drain valve 3.

The pressure around the flexible hose member 18 is normally temporally adjustable, but can also be controlled from the control center 9 by a safety device in the form of a sub-pressure monitoring member 25 disposed adjacent to the pressure sensor 17 described above. The pressure monitoring element 25 detects the vacuum level at which the pressure 10 must be shut off and the pipe section 16 must be aerated.

Because the hose member 18 is folded or double folded at its downstream end, as shown in Figures 4 and 5, it has a relatively wide freedom of movement. The vacuum created by the ejector 5 in combination with the pressure generated by the pressurized air acting through the inlet 19 acting on the let-15 nozzle 18 causes the tubular member to contract folds as shown in Figure 6, thereby providing a pressure effect reduction in the ejector outlet cross-sectional area. The reduction action of the hose member has a very beneficial effect on the power of the ejector 5 and contributes to reducing the air consumption of the ejector. As the waste material passes through the hose member 18, the folded hose member expands so that larger solids can also pass through it without difficulty. Pressure-modifying, i.e., contraction of the tubular member 18, increases the degree of control of the contraction and promotes the development of vacuum in the ejector, reducing air consumption. Guided Operation of Hose Element 18 • · ·. ···. reduces its vibration resulting in a lower noise level.

As shown in Figure 5, the hose member 18 comprises, at its inlet end,: ***. a stiffener comprising a cylindrical portion 21, of which four circumferential · ***: spaced apart, axial portions 22 extend nearly to the longitudinal central portion of the ♦ ··, cc \ in the double folded state.

The stiffener is integral with the hose member 18 and is formed by locally increasing its material strength. The axial portions 22 of the stiffener control the contraction of the lethality of the lance 18 so as to obtain regular folds and louvre 10 106220 bore 20 according to Fig. 6, where the hose member 18 is seen from its downstream end.According to the embodiment of Fig. 4, the downstream section 7 of the drain pipe is about 40% larger in diameter than the upstream section 4 of the drain pipe. the risk of a slow flow in the drain-5 pipe.

Such a flexible hose member, or hose, substantially improves the efficiency of the ejector, and thus the amount of pressurized air used can be reduced, in many cases up to 2/3. Preferably, the flexible hose member 18 is mounted immediately downstream of the section in which the ejector suction tube engages the ejector outlet 10. To achieve the best performance of the flexible hose member, the downstream end of the flexible hose member comprises said axially directed stiffener portions which provide a steering effect on the shrinkage movement of the flexible hose member, particularly in its initial phase.

To give an example, a suitably designed flexible hose member 15 18 having a wall thickness of about 1 mm, a wall thickness of the stiffener portions 21,22 of about 2 mm, a length of about 110 mm, and fitted to a drain pipe of about 54 mm in diameter may result in the central free opening 20 having a diameter of only about 10 mm. A flexible hose member 18 having a wall thickness of only about 1 mm may be • e (t 20 easy to modify, but on the other hand is very susceptible to wear and, for example, · sharp objects that can accompany flushing of the waste material. Thus, it may be advantageous to increase the material strength of the flexible hose member 18, up to about 12 mm, preferably in the range of about 0.5 ... 12 * · * *. ···. mm. Accordingly, the pressure exerted on the hose member 18 must be increased to achieve its penetration, which can be effectively accomplished in the manner described above, with the added advantage that the hose member having a greater wall thickness has its ··· · *** severity. , that is, reduced vibration, which significantly reduces the noise level of the vacuum · ··· / ”/ system.

Fig. 7 shows the rinsing cycles for toilet bowl 1 in the system according to fig. 2. The time values given in the following are only given as examples to illustrate the general use of the flush cycle.

The flushing cycle is initiated by using a push button 8 for a short period of time, a fraction of a second, as shown in column 8a. This activates the ejector 5, which operates for about 5 to 6 seconds, shown in columns 5b and 5c, respectively. At the same time, pressurized air is also introduced around the flexible hose member 18 shown through the column 23a, the tube member 11a, and the inlet 19 to effect controlled contraction of the hose member 18 and thereby enhance and stabilize the vacuum development of the ejector 5. About 2.5 seconds 10 after the ejector 5 is activated, the drain valve 3 is opened and held open for about 3 seconds as shown in column 3a. When the drain valve 3 is opened, the pressurized air supply (23a) to the hose part 18 is stopped and the space 26 formed during the contraction is vented to the environment via the three-way shut-off valve 23. The operation of the ejector reduces the pressure in the upstream part of the sewer pipe 4 by about 40kPa, as shown by curve 4a, before the sewer valve 3 opens. When the drain valve 3 opens, the pressure in the upstream part 4 begins to increase and, within the time the drain valve 3 is kept open, reaches its original value. After closing the drain valve 3, the pressure may drop slightly over a period of about 0.5 seconds due to the pressure exerted by the ejector 5, provided that it is maintained (column 5c) until (for a short time thereafter: when) the drain valve 3 is closed. The longer operating time of the ejector (column 5c) may be 1 cV I to ensure that all waste material is properly drained from the drain pipe. Alternatively, the ejector 5 may be operated for a shorter time (column 5b), whereupon it is stopped (slightly, for example, about 25 seconds for about 0.5 seconds) before closing the drain valve 3. The system can then be locked for a period of time T, for example 5 seconds, to avoid repeating too often

Ml · ***: Flushing which could lead to malfunction of the system.

· · ·

The ejector 5 may also be used for a longer period (column 5a) after closing the drain • 3, if this would be advantageous for emptying.

. «··. 30 However, this would affect the consumption of air and energy, which will be explained in more detail below.

• · 12 106220

The air supply to the ejector can be in the range of about 500 to 1500 liters / minute, whereby the volume of air is calculated at standard temperature and pressure (0 ° C, standard atmospheric pressure). Of course, it is advantageous to reduce the amount of air supplied to the ejector as much as possible without, however, risking the system's safe operation, since the lower the air consumption, the lower the energy consumption.

The energy consumption of the drainage cycle is also influenced by the volume of the space under its vacuum. The smaller the volume, the lower the energy consumption. However, the portion of the sewer pipe to be subjected to vacuum must not be too short, since then the vacuum volume is too small to provide efficient drainage of the toilet bowl.

In the illustrated embodiment, to give an example, and in the case of a collecting tank 6, the distance L between the drain valve 3 and the ejector 5 may for example be about 1 to 10 m, preferably in the range of about 2 m. several meters such that the ejector 5 is located between the ends of the drain pipe 3 extending from the drain valve 3 to the collection tank 6 and forming the upstream part 4 and downstream part 7 of the drain pipe, and not at the other end of the drain pipe.

However, it is preferable to place the ejector relatively close to the drain end of the sewer pipe, i. for example, as close to a collection container as possible (I

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; list, as this would ensure proper and efficient drainage of <<V '. By designing the downstream part 7 of the drain pipe as short as possible, air consumption can also be minimized. The ejector could even be located in a collector tank, so that the length of said downstream portion would be practically close to O m.

On the other hand, for the maintenance and / or repair of the ejector, it may be advantageous for the ejector to: **. the market place would be located as close as possible to the toilet or other waste • • · unit that is to be emptied into the vacuum sewer.

··· c “\ The above related values are given by way of example only and • j« · j are dependent on the design and fit of the vacuum sewer system.

«« <· «« I I I <«I« C «« · 13 106220

For example, the time values described in connection with Figure 7 are, among other things, directly dependent on the respective lengths of the drain pipe sections. To illustrate this, the following example can be given.

For example, with the length of the upstream section 4 of the sewer pipe being 2 m, the length of the downstream section 7 of the sewer pipe being e.g. close to 0 m (i.e., ejector 5 forms the end of the sewer pipe or ejector 5 is disposed in seconds. The ejector 5 could be closed at the same time as the drain valve 3 is closed, since there would be no distance for the waste material to convey it further.

The longer the upstream part 4 is, the greater the relative volume of the space to be vacuumed, which means a longer operating time of the ejector. The same applies to the downstream part if efficient drainage is to be ensured at all times. This, of course, also affects the operating time of the drain valve. The shape of the drain pipe, i.e. angles, bends, straight sections, etc., also influences the operating periods.

The vacuum sewer system according to the invention may include several toilets, or other unit for receiving waste. Thus, the upstream part of the sewer pipe may be branched and several branches connected to the respective toilet vessel, although the number of toilet vessels should not be I (I ·] '·' 20 too large, which would result in excessive compressed air consumption. through the upstream part with two branches.

<<• c .1 Preferably, the control panel prevents two toilets from being emptied at the same time.

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, 1;. * Ti. The invention can also be applied to various types of vehicles, including vessel units, as described above, and also to fixed installations.

The invention is not limited to the embodiments shown, but many variations thereof are possible within the scope of the appended claims.

· · · · · · · · · · · · · · · · · · · · ·

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«A a aa · a a a a · • · 14 106220

A method of operating a vacuum sewer system comprising: a waste receiving unit (1) for periodic emptying through this outlet (2), controlling a waste valve (3) from the waste receiving unit through an outlet (2), an upstream portion (4) connected to the drain valve (3) and a downstream portion (7) forming a drainage outlet, and an ejector (5) having a drive medium inlet (11) and integrated into the drainage pipe such that the upstream portion of the drainage pipe (4) forming an ejector suction pipe and a downstream portion of the drain pipe (7) forming an ejector outlet pipe, wherein the drive medium is fed to the ejector (5) through a drive fluid inlet (11) 15, thereby creating a vacuum upstream (4), air pressure pushes the waste material in the waste receiving unit (1) into and upstream of the drainage pipe section (4), the waste material is further transferred through the downstream section (7) of the drainage pipe to the downstream section (7) of the ejector; and in which method <ttt V the drain valve (3) is closed by emptying the waste receiving unit (1) • * · *. ·; · [i, characterized in that * · · 25 operating media are supplied to the ejector (5) over a period of time. (5a-5c), which substantially: *** · comprises a period (3a) when the drain valve (3) is open, and that the pneumatic pressure is maintained in the downstream part (7) of the drain tube (7). «In this period.

The method according to claim 1, characterized in that the use interval, · «·. The supply of 30 substances to the ejector (5) is terminated shortly before (5b) closing the drain brick (3).

Method according to claim 1, characterized in that the supply of the operating medium to the ejector (5) is terminated shortly after closing (5c) of the drain valve (3).

The method of claim 1, wherein the vacuum drainage system 5 in the region of the downstream portion (7) of the sewer pipe, in the zone where the operation of the ejector (5) produces vacuum, further comprises an internal resilient hose member (18) opposite, and in said zone, an inlet (19) in the wall of the tubular member (16), characterized in that the driving medium is guided from the inlet (11) of the driving medium 10 and fed through the inlet (19) to the outer surface of the flexible hose member (18) ) between the wall and that said feeding is performed during the time period (23a) before the drain valve (3) is opened.

Method according to Claim 4, characterized in that the driving fluid is supplied at an excess pressure in the range of about 0.0 to 2.0 bar, preferably in the range of about 0.0 to 0.7 bar.

A method according to claim 5, characterized in that the drive medium is supplied for a period (23a) which begins at the same time as the drive medium supply period (5a-5c) of the ejector (5) begins and ends, 20 when the drain valve (3) is opened, and that the supplied operating medium is discharged into the environment at the end of the supply period n (23a).

ί ΐ \ <· t V) 7. Vacuum drainage system comprising a waste receiving unit • ♦ · (1) for periodic emptying through this outlet (2) • · · to control the waste material flow in the drain valve (3). m 25 from the receiving unit through an outlet (2), a sewer pipe having: *** · an upstream part (4) connected to a sewage valve (3) and a downstream part (7) which · * ": forms an outlet end of the sewer pipe, and 5) having a drive medium inlet (11) and integrated into the drain pipe such that the upstream portion (4) of the drain pipe (4) forms an ejector suction pipe and drain pipe, *. the downstream part (7) forms an ejector outlet tube, which is a downstream part of the drain pipe (7), in a zone where the operation of the ejector (5) produces a vacuum, the inner flexible hose member (18) having an outer surface divides the wall of the surrounding tubular member (16), wherein said zone is provided with an inlet (19) to the wall of the tubular member (16), characterized in that the inlet (19) is connected to an actuator fluid inlet (11) and the wall of the surrounding tubular member (16).

Vacuum drainage system according to claim 7, characterized in that the flexible hose part (18) has a wall thickness in the range of about 0.5 to 12 mm.

Vacuum drainage system according to Claim 7, characterized in that the supply medium supply valve (10) is arranged between the supply medium inlet (11) and the ejector (5), the inlet (19) in the wall of the pipe section (16) being connected to the pipe section (11a). which is connected to the drive medium inlet (11), and that the tubular member (11a) is led from the drive fluid inlet (11) upstream of the drive fluid supply valve (10).

Vacuum drainage system according to claim 9, characterized in that the pipe section (11a) is provided with a pressure regulator (24) and a three-way shut-off valve (23).

A vacuum sewer system according to claim 10,

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20, characterized in that the shut-off valve (23) is connected to a vacuum drainage system (e;;) to a dispensing center (9) which is also connected to a drive medium supply valve (10).

• · ·

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* ··! Vacuum system according to claim 11, characterized in that the upstream part (4) of the sewer pipe is provided with a safety device • · · 25 (25) connected to a control center (9) and a shut-off valve (23), and (25).

Vacuum drainage system according to claim 7, characterized in that the vacuum sewerage system comprises a waste container (6),

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*; «*« Connected to the downstream part of the drain pipe (7).

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Claims (13)

106220 A method of operating a vacuum sewer system comprising a waste material receiving unit (1) which is intended to be emptied from its outlet port (2), a drain valve (3) to control the flow of the waste material from the waste material receiving unit (2) from time to time (2). ), a drain pipe having an upstream portion (4) connected to the drain valve (3), and a downstream portion (7) constituting the outlet end of the drain pipe, and an ejector (5) having an inlet (11) for operating medium and which is integrated into the drain pipe such that the upstream portion (4) of the drain pipe constitutes the ejector suction pipe and the downstream portion (7) of the drain pipe constitutes the ejector outlet pipe, in which process operating medium is measured into the ejector (5) through an inlet (11) of the operating medium, the upstream part (4) of the sewer pipe, the sewer valve (3) is opened, whereby the ambient air pressure forces the waste material in the waste material receiving unit (1) into the sewer pipe. s upstream part (4) and through this, waste material is further transported through the downstream part (7) of the sewer pipe by means of the ejector (5) in the downstream part (7) of the sewer pipe. V; tical pressure, and by which process c>. the drain valve (3) closes when the waste material receiving unit (1) is emptied, characterized by the fact that • 9 • * · * '25 propellant is measured at the ejector (5) for a period of time (5a -5c) substantially comprising a period of time (3a), wherein the drain valve (3) is open, and that i) the downstream portion (7) of the drainpipe maintains a pneumatic pressure during said period of time. The method according to claim 1, characterized in that the feed medium is fed; ; The ejector (5) is closed (5) shortly before (5b) the drain valve (3) is closed. I («t« tl I I «« is 106220 Method according to claim 1, characterized in that the feed medium supply to the ejector (5) is terminated shortly after (5c) the drain valve (3) is closed. The method of claim 1, wherein the vacuum drain system at the region of the upstream portion (7) of the drain pipe, at a zone where the ejector (5) functions to provide negative pressure, further comprises an inner flexible hose member (18) whose outer surface is located opposite a wall of a surrounding pipe portion (16), and at said zone an inlet opening (19) located in the wall of the pipe portion (16), characterized in that the operating medium is led from the inlet (11) of the operating medium and is fed through the inlet opening (19) between the flexible hose part 10 (18). ) exterior surface and the wall of the surrounding pipe portion (16) and that said inlet is carried out for a period of time (23a) before the drain valve (3) is opened. Process according to claim 4, characterized in that the operating medium is fed with an overpressure in the range of about 0.0 ... 2.0 bar, preferably in the range of about 0.0 ... 0.7 bar. Method according to claim 5, characterized in that the operating medium is fed for a period of time (23a) which starts at the same time as the time period (5a-5c) for feeding the operating medium of the ejector (5) begins, which ends when the drain valve (3) is closed, and that the input operating medium is vented to the environment at the end of the input time period (23a). A vacuum drainage system comprising a waste material receiving unit (1) t * which is intended to be emptied from its outlet opening (2) at times, a θαρρεί .: valve (3) for controlling the flow of waste material from the waste material receiving unit through the outlet opening (2), a drain pipe having an upstream portion (4) connected to the outlet valve (3), and a downstream portion ♦ · · • «· *;] / 25 ( 7) which constitutes the outlet end of the drain pipe, and an ejector (5), which exhibits an inlet (11) for operating medium and which is integrated in the drain pipe so that ... the upstream part of the drain pipe (4) constitutes the ejector suction pipe and the drain pipe • t * "r downstream portion (7) constitutes the ejector outlet pipe, which downstream portion (7) of the <sewer pipe, at a zone where the ejector (5) function provides suction, comprises an inner flexible hose member (18), the outer surface of which is located «· * · * opposite the wall of a surrounding pipe portion (16), wherein at said zone in the wall of the pipe pair (16) there is provided an inlet opening (19), characterized in that the inlet opening (19) is connected to the inlet (11) of the operating medium. feeding operating medium between the outer surface of the flexible hose member (18) and the wall of the surrounding tube portion (16). Vacuum drainage system according to claim 7, characterized in that the wall thickness of the flexible hose member (18) is in the range of about 0.5 ... 12 mm. Vacuum drainage system according to claim 7, characterized in that an operating medium inlet valve (10) is arranged between the inlet (11) of the operating medium and the ejector (5), the inlet opening (19) in the wall of the pipe portion (16) is connected to a pipe portion (11a). which is connected to the inlet medium (11) of the operating medium and that the pipe portion (11a) is deflected from the inlet medium (11) of the operating medium countercurrent to the operating medium inlet valve (10). Vacuum drainage system according to claim 9, characterized in that the pipe portion (11a) is provided with a pressure regulator (24) and a three-way check valve 15 (23). Vacuum drain valve according to claim 10, characterized in that the check valve (23) is connected to a control center (9) of the vacuum drain system, which control center is also connected to the operating medium inlet valve (10). Vacuum drainage system according to claim 11, characterized in that the upstream part (4) of the drain pipe is provided with a safety device (25), k: connected to the control center (9) and the check valve (23), and that the The device is a vacuum monitoring device I25). • o Vacuum drainage system according to claim 7, characterized in that the vacuum system comprises a waste receptacle collection container (6) connected to the downstream part (7) of the drainage pipe. ♦ ♦♦ • · • · t <<«<<((t • I« <«« «