SE468485B - PROCEDURE AND DEVICE FOR CLEANING THE EVACUATION CHANNELS IN A VACUUM DRAINAGE SYSTEM - Google Patents

Abstract

A method and an arrangement for cleaning the evacuation duct (28) of a vacuum sewer system is described. In such a system partial vacuum is used for providing transport of waste matter through a sewer pipe (2) from a waste matter providing unit (1) to a collecting chamber (13). Function control units (5, 12, 25) govern the generation of a partial vacuum in the sewer pipe (2) prior to each transport of a volume of waste matter through the sewer pipe (2). After completing the transport of a volume of waste matter from the providing unit (1) to the collecting chamber (13), the function control units (5, 12, 25) are activated to regenerate partial vacuum in the sewer system (2, 13) and thereafter to let in a charge of ambient air to flow through the evacuation duct (28), through which air is normally drawn from the system (2, 13) when the partial vacuum is generated. This provides a purging and cleaning of the evacuation duct (28). <IMAGE>

Description

45 Cïx OH Eel- Oops UÜ 2 the measures specified in claim 1 and through that in claim specified construction.

By after each transport of a batch of sewage again generate negative pressure in the system you get an opportunity to courage the normal flow direction let in a powerful cleanser air flow through the evacuation duct. The only action that required is that the negative pressure generation ceases and that the evacuation duct is open to the ambient air.

The atmospheric air will then due to its higher pressure to quickly rush into the sewer system through the evacuation channel, wherein this is purified by impurity and liquid is entrained by the air. The cleaning effect can be increased by that a valve is arranged in the evacuation channel. By hurrying open this valve when there is full negative pressure in the drainage system, a strong air shock is obtained, which effectively cleans the evacuation the channel.

It is basically indifferent where in the evacuation channel the valve is located. In practice, however, it has proven to be best to place the valve near the collection chamber and close the valve, on its opposite side arrange a device for collection of liquid present in the evacuation channel. Such a device can be provided by allowing the evacuation channel form a pipe bend or pocket into which liquid flows higher sections of the channel on each side of the pocket.

By controlling the valve of the evacuation duct so that it is held open when a vacuum builds up in the system and when clean air is released into the system, but otherwise kept closed, you get better control of system operation. At the same time obstructs the valve that odors from the sewer system are spread to the environment.

In a system according to the invention it is suitable that on and use the known collection chamber as one preliminary collection space, where a batch of sewage is collected immediately after transport for later transfer to a -Tà CN CO 'ä- CD U "l 3 under atmospheric pressure collecting tank or the like.

Such a device is described in patent specification SE 444594. It volume to be pressurized can in such a system kept small. It is appropriate to new negative pressure generation for cleaning of the evacuation duct is started only after the collection the chamber is emptied. This achieves the advantage of purification of the evacuation duct does not create splashes or splashes on due to the fact that the collection chamber contains liquid. In addition the existing liquid in the evacuation channel has time to collect in the lowest section of the duct, whereby the cleaning becomes IQ.

By making the evacuation channel valve remotely controlled via system control unit depending on the control of the system other valves achieve the advantage of all system functions are monitored by the same control unit. The risk of malfunctioning down then becomes the smallest possible.

The invention is described in more detail below with reference to the accompanying drawing, the only figure of which shows a principle diagram over a drainage system according to the invention.

In the drawing, 1 denotes one via a drain valve 9 to one vacuum drain 2 connected toilet. Drain pipe 2 opens into one emptying order 3, comprising a collection chamber 13, from which the sewage mass can be passed on to a collection tank 4. The system also comprises one acting as a vacuum pump ejector 5, which is operated with compressed air from a compressed air network 6.

Toilet J. receives flushing water from eu: water reservoir 7 through a pipe 8 and a flush water valve 10. Drain the toilet and the flush water supply to the toilet bowl is controlled by a control device 25, which acts on the drain valve 9 and flushing water valve 10, when flushing is initiated by affecting one flush knob ll. The system is basically built as shown in patent specification SE 444594.

When the control device 25 has received a coil pulse from the coil knob 11, it opens the valve 12 in the one connected to the ejector 5 468 485 4 compressed air pipe 6. The ejector 5 then quickly develops negative pressure in the evacuation pipe 28, in the drain pipe 2 and in the emptying device 3. When a sufficiently large negative pressure has formed, closes the compressed air valve 12, the suction effect of the ejector ceases and the toilet 9's drain valve 9 opens. Preferably one is used negative pressure of about half an atmosphere. After emptying the toilet bowl closes the drain valve 9 and flushing water flows to through the flush water valve 10, which. has already been opened previously, and fills the lower part of the toilet bowl with a small amount of water. The total amount of flush water generally needs not be larger than a few decilitres.

Since there is negative pressure in the drain pipe 2, when the drain valve opening 9, the drain in the toilet bowl is pressed. the mass of the atmospheric pressure out into the drain pipe 2 and through it to the collection chamber 13. In order for the transport of sewage so safe to happen without interruption, it is important, that it at the end of the drain pipe 2 there is a sufficiently large one air space. About the collection chamber 13 and the pipes that are connected thereto do not together form a sufficiently large space, you can go to the evacuation channel closest to the part 14 of the sanitary device 3 connect a separate air reservoir . As a dimensioning example, it can be mentioned that the drain pipe year 2 to its volume can be 5 ... l0 liters, the emptying device 3 including collection chamber about 7 liters and air reservoir aren 15 about 18 liters.

When transporting a batch of sewage, the negative pressure is eliminated in the drain pipe 2 and in the emptying device 3 in general completely. The drain valve 9 can be so constructed that it closes automatically, when there is no longer anything Immediately after the transport process opens a preferably compressed air driven working cylinder 16 a bottom valve 17 in the collecting chamber significant negative pressure in the drain pipe 2. 13 and the sewage mass in the collection chamber drains to the collecting tank 4. Then the working cylinder 16 closes again bottom valve 17. The collection tank 4 is emptied with suitable intervals through an emptying pipe 18. The collection tank 4 can O! 468 485 be equipped with conventional alarm and security devices to prevent overfilling.

The collection chamber 13 is emptied automatically after each transport of sewage. The system's automatic control device takes care of this by controlling the working cylinder 16.

In this way the advantage is achieved that the collecting chamber 13 can be small and there is no need for a level guard or others, for example monitoring devices.

During each evacuation of the drainage system, a small amount is sucked dirt and moisture into the evacuation channel 28. To not there over time an accumulation of impurity and fluid should occur the duct must be cleaned. This is done by after each transport of sewage pulp from the toilet 1 to the collection chamber maren 13 and after the collection chamber has been emptied into the container 4 re-generate negative pressure in the sewer system, which happens on the same way as when wastewater is to be transported, ie. with vacuum pump 5. When the desired negative pressure is reached, close one in evacuation duct 28 existing purge air valve 27 by its actuator 26 receives a closing impulse from the control unit . The drain valve 9 remains closed and is opened instead the clean air valve 27 quickly, whereby atmospheric air rushes in through evacuation channel 28 to space 2, 13-15 and equalizes it where the prevailing negative pressure.

The cleaning of the channel 28 is facilitated by being in the channel arrange a pocket or a lowest place 28a where moisture can flow down before cleaning the channel 28 is performed. It could be advantageous that in negative pressure generation for purification of evacuation channel 28 build up the negative pressure significantly slower than when negative pressure is generated for emptying the toilet l. By making the negative pressure generation slowly avoids that moisture such as collected in the pocket 28a is carried up to the ejector 5.

By all the actuators 9, 10, 12, 16 and 27 of the system controlled by the same control unit 25, the different functions can be easily 468 485 s coordinated and controlled in desired sequences depending on each other.

The invention is not limited to the embodiment shown. but, without a number of variants and modifications thereof are conceivable within the scope of the following claims. a]

Claims (10)

PATENT REQUIREMENTS A method for cleaning the evacuation channels (28) in a sewage system, in which negative pressure is used to effect the transport of sewage mass through a sewage pipe (2) from a sewage mass discharge unit (1) to a collection chamber (13) or the like and there the operating devices of the system (5, l2,25) develop negative pressure in the drain pipe (2) separately for each transport of a batch of sewage mass through the drain pipe (2), characterized in that after completion of the transport of a batch of sewage mass the operating devices (5, l2,25) again controlled to form negative pressure in the drainage system (2, 13) and to subsequently let in ambient atmospheric air through the evacuation duct (28), through which air is normally extracted from the system (2, 13) during the formation of said negative pressure, in order thereby to empty and clearing the evacuation channel (28). Method according to Claim 1, characterized in that purifying air is admitted into the evacuation duct (28) in the form of an air shock by rapidly opening a valve (27) arranged in the duct. Method according to claim 2, characterized in that the valve (27) of the evacuation duct is kept open when negative pressure builds up in the system (2, 13) and when purge air is let into the system, but is otherwise kept closed. Method according to one of the preceding claims, characterized in that the collecting chamber (13) is arranged in a manner known per se to function as an intermediate reservoir, from which. where collected sewage mass is passed on to a collection tank (4) or equivalent, preferably under atmospheric pressure, and that negative pressure generation for cleaning the evacuation channel (28) is started only after the collection chamber (13) has been emptied. 468 485 8 Device for cleaning the evacuation channels (28) in a sewage system, in which negative pressure is used to effect the transport of sewage mass through a sewage pipe (2) from a sewage mass discharge unit (1) to a collecting chamber (13) or the like and there the operating devices (5,12,25) of the system are arranged to develop negative pressure in the drain pipe (2) separately for each transport of a batch of sewage mass through the drain pipe (2), characterized in that the operating devices (5,12,25) of the system after completion transport of a batch of sewage mass is arranged to re-form negative pressure in the drainage system and then to let in ambient atmospheric air into the evacuation duct (28), through which air is normally extracted from the system (2, 13) during the formation of said negative pressure, in order to empty the air stream and clear the evacuation duct (28). Device according to claim 5, characterized in that a preferably rapidly opening valve (27) is arranged in the evacuation duct (28) for admitting a purifying air flow into the duct (28). Device according to claim 6, characterized in that the valve (27) of the evacuation duct is arranged to be kept open when negative pressure builds up in the system (2, 13) and when purge air is let into the system and is arranged to be otherwise closed. Device according to one of Claims 5 to 7, characterized in that the collecting chamber (13) is arranged in a manner known per se to function as an intermediate reservoir, from which sewage mass is arranged to be passed on to a collecting tank (preferably under atmospheric pressure). 4) or equivalent before starting a new negative pressure generation for cleaning the evacuation duct (28). Device according to one of Claims 5 to 8, characterized in that the valve (27) of the evacuation channel is located close to the collecting chamber (13) and in the vicinity of the opposite side of the valve; In 1263 489 len (27) there is a device (28a) for collecting liquid present in the evacuation channel (28). Device according to one of Claims 5 to 9, characterized in that the valve (27) of the evacuation channel is remotely controlled by the control unit (25) of the system in dependence on the control of the other valves (9, 10, 12) of the system.