CN85105961A - Be used for liquid, particularly a kind of device of the suction type induction system of sewage - Google Patents

Abstract

The invention relates to a device for an air-suction conveying system for liquids, especially sewage, which consists of a conveying pipe (12), which is under negative pressure and passes through a normally closed valve (13) and a suction pipe (14). ) is connected with the liquid collection container (10), after the liquid flows into the system, when the air enters, a pressure change occurs, which in turn causes the closing movement of the valve (13).

Description

A device used in air suction conveying systems for liquids, especially sewage

The present invention relates to a device for an air-suction liquid delivery system, and is particularly suitable for an air-suction sewage delivery system. The device comprises a delivery pipe in a negative pressure state, which is connected to a liquid collection container via a valve and a suction pipe that are closed under normal conditions.

The aforementioned type of device is already known, such as Swiss Patent 368058, which discloses a device that utilizes a float mechanism to achieve valve opening. In this device, when the float reaches a predetermined upper position, it opens a valve, connecting to a negative pressure delivery pipe, and draws wastewater out of the collector. Once the wastewater is drained, the float sinks to a lower position, closing the valve and allowing wastewater to be collected again in the container. The float then rises until the water is drained again, and the process repeats. This method works well in some situations, but it is limited in systems with large collection volumes and widely varying liquid levels.

Other devices described in Swiss Patent 328532, German Patent AS2,462,292, and U.S. Patent 3,777,778 can also be considered to fall within the above-described scope. In these devices, a system for measuring the static pressure of the sewage is used instead of relying on changes in liquid level to actuate the valve. This system utilizes a flexible diaphragm connected to the collector via a delivery pipe. When the amount of sewage in the collector rises, the diaphragm mounted on the upper portion of the delivery pipe bulges due to the increased sewage pressure, exerting force on a pilot valve, thereby connecting the negative pressure delivery pipe to a valve actuation device, causing the valve to open. Closing the valve can be accomplished by a timer-operated device that is activated when the flexible diaphragm returns to its original position, i.e., when the static pressure drops below a predetermined value, to close the valve.

According to another known solution, two devices for sensing static pressure can also be used respectively, one of which causes the valve to open and the other causes the valve to close, that is, not only the opening of the valve is completed, but also the closing of the valve is completed in the same way.

The present invention is directed to providing another type of device capable of precisely controlling the opening of a valve. When the liquid level reaches a predetermined height above the collector, the valve immediately opens and remains in this open position until the liquid level drops below the height corresponding to the suction tube inlet, and air begins to be drawn into the suction tube.

These processes are accomplished by an apparatus defined by the following requirements. The present invention will now be described by way of example with reference to the accompanying drawings, which depict a cross-section of an apparatus according to the present invention. Reference numeral 10 designates a sewage collector into which sewage flows under gravity from a conventional pipe 11, which is connected to the building's sanitary facilities in a conventional manner.

A negative pressure pipe 12 extends from the top of the collector 10, leading to a sewage collection point, a purification plant, or a conventional sewage system. As is common practice, a suitable negative pressure generating device is installed downstream of the pipe to maintain negative pressure within the pipe 12. The negative pressure pipe 12 is connected to a suction pipe 14 via a valve 13. The suction pipe 14 extends vertically downward through the top of the collector 10, with its inlet 15 near the bottom of the collector. In the illustrated embodiment, the valve 13 is operated by negative pressure in a conventional manner. The negative pressure within the pipe 12 is transmitted to the valve 13 via a valve closing actuator 16, thereby opening the valve and connecting the suction pipe 14 to the negative pressure pipe 12. A hose 17 runs between the negative pressure pipe and the valve closing actuator, and another hose 18 runs between the valve closing actuator and the valve. The valve closing actuator 16 is composed of a diaphragm 20 mounted in a cylinder 19, dividing the cylinder into a lower chamber 21 and an upper chamber 22. The diaphragm 20 is biased upward by a spring 23. Specifically, a push rod 24, extending upward, is mounted in the center of the diaphragm, extending through the upper chamber 22. A sealing ring 25 is mounted on the top of the push rod. This ring cooperates with upper sealing surfaces 26 and lower sealing surfaces 27 within a tube 28 to provide a tight seal. Tube 28 extends from cylinder 19 via throat 29. Hose 17 connects to the upper portion of tube 28, while hose 18 connects to the lower portion. The upper chamber 22 and throat 29 are connected to the atmosphere via hole 30.

The lower chamber 21 is connected to the suction pipe 14 through a hose 31, and a one-way valve 32 is arranged on the hose 31. Further, the lower chamber 21 is also connected to a hose 33, and the hose 33 connects the lower chamber 21 to a hose 35 through a valve starter 34, and the hose 35 is directly connected to the hose 17.

Valve-opening actuator 34 is a device similar to that described in some of the aforementioned patent documents. It includes a diaphragm (not shown) disposed within conduit 36. Under the influence of the hydrostatic pressure of the liquid in collector 10, it connects hose 33 and hose 35. Suction tube 14 and hose 33 are connected to the atmosphere via orifices 37 and 38, respectively. Orifice 38 has a throttle valve.

The above device system works in the following way:

Under normal conditions, valve 13 is closed, and negative pressure exists in pipe 12, hoses 17, and 35. Valve-opening actuator 34 is inactive, meaning hose 33 is at atmospheric pressure. Consequently, lower chamber 21 is also at atmospheric pressure, with diaphragm 20 in its uppermost position. Sealing ring 25 and sealing surface 26 are in contact, creating a tighter seal due to suction. Similarly, hose 31, throat 29, and hose 18 are all at atmospheric pressure above suction pipe 14.

As sewage continues to flow into the collector through pipe 11, the static pressure in pipe 36 increases. When the liquid level reaches a predetermined level, hoses 33 and 35 are connected. This means that, although the throttle valve hole 38 leading to the atmosphere has a certain degree of attenuation, the negative pressure state is still transmitted to the lower chamber 21.

Due to the negative pressure in the lower chamber 21, the one-way valve 32 closes, the diaphragm 20 is sucked downward along with the push rod 24, and the sealing ring 25 breaks away from the sealing surface 26 and moves quickly to form a closed connection with the sealing surface 27. This means that the negative pressure is transmitted from the hose 17 to the hose 18, and the valve 13 opens.

Then, the suction pipe 14 is connected to the negative pressure pipe 12, so that the sewage in the collector 10 will be sucked out through the nozzle 15 and further sent to the pipeline 12. During this transportation process, the air sucked by the hole 37 is mixed with the sewage.

When the liquid level in the collector 10 drops, that is, the static pressure in the pipeline 36 drops, it means that the valve actuator 34 disconnects the hoses 33 and 35 again. In this way, since the atmosphere can enter the hose 33 through the hole 38, the air pressure in the lower chamber 21 will increase.

During liquid delivery, a negative pressure is also present in hose 31. This negative pressure is a function of the height of the liquid column in suction tube 14 and the flow resistance. The throttle valve in orifice 38 is designed such that when valve actuator 34 disconnects hoses 33 and 35, even though air is entering lower chamber 21, the negative pressure in hose 31 is sufficient to maintain one-way valve 32 in its original open position and diaphragm 20 in its lowest position.

When the liquid level in the collector 10 drops to the same level as the inlet 15, air will suddenly enter the nozzle 15. When this incoming air column rises to the junction of the hose 31 and the suction pipe 14, the air pressure in the hose 31 suddenly increases, which means that the one-way valve 32 is closed and the air pressure in the lower chamber 21 increases.

Then, diaphragm 20 is pressed upward by spring 23, and sealing ring 25 moves upward to engage sealing surface 26, blocking the connection between hoses 17 and 18. Atmospheric pressure air flows through hole 30 into hose 18, and valve 13 closes. At this time, the sewage can be collected and stored in collector 10 again.

It is also possible within the scope of the invention to design the device with a time control function so that the valve remains in the open position for a given time after air has started to flow into the suction tube 14. In this case, the hole 37 can be omitted.

The pressure change can also be converted into an electrical signal, thereby adopting any suitable method to operate the valve, such as electric method and/or pneumatic method.

Claims (7)

1, a kind of particularly device of the suction type induction system of sewage of liquid that is used for, comprising the conveyance conduit that is under the negative pressure state, this pipeline is connected on the liquid collecting container through the valve and the suction pipe of closing under the conventional state.Its characteristics are: in this device, the closing movement of valve (13) is after liquid inflow system, when air enters, causes owing to pressure changes.

2, install according to claim 1, characteristics are: the signal that is produced by described pressure variation combines with the time-controlling arrangement of time-delay closing valve.

3, install as claimed in claim 1 or 2, characteristics also are, valve (13) is connected with the negative pressure pipe via the contact of (17,18,28,29) each part, described this connection includes guide valve (28,29), the effect of this valve is that negative pressure or conventional atmospheric pressure are guided on the starting drive of valve, described guide valve (28,29) is by pneumatic or electronic control, and connects with the device (19) that changes in order to indicated pressure.

4, install according to claim 1, characteristics are that the device (19) that indicated pressure changes includes an empty chamber (21), it is linked on the suction pipe (14) via a flexible pipe (31) or similar facilities, this sky chamber is limited by barrier film (20), barrier film is had an effect to joint ring (25) or similar means, thereby can be switched on or switched off the contact of negative pressure pipe (12) and described valve (13).

5, as device as described in the claim 4, characteristics are to be equipped with on the flexible pipe (31) and prevent to empty chamber the one way valve (32) that flows to take place.

6, as device as described in claim 4 or 5, characteristics are that sky chamber (21) is connected in the mechanism (34) that is referred to as starter via attached flexible pipe (33) or similar facilities, when liquid level reached assigned altitute in the gatherer, this starter can be passed to sky chamber (21) to negative pressure from negative pressure pipe (12).

7, as device as described in each in the claim 4 to 6, characteristics are to have on the barrier film (20) push rod (24), support promoting joint ring (25), barrier film is under the effect of spring (23), and the direction of extension of spring then is the direction that disconnects negative pressure pipe (12) and valve (13) UNICOM.

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