JPS5839562B2 - Siphon type mud collecting machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a siphon-type sludge collecting machine that uses a siphon to suck up sludge settled in a sedimentation tank of a sewage treatment plant, etc., and in particular, it automatically and reliably operates the vacuum pump required at the start of operation. This invention relates to a siphon-type sludge extraction machine equipped with a control device.

Conventionally, a siphon-type sludge collector is used to transport the sludge that settles into a settling tank.

In order to simply explain this conventional siphon-type sludge collecting machine, it is shown in Figs. 1 to 3.

FIG. 1 is a plan view of a conventionally known siphon-type sludge collecting machine, FIG. 2 is a front view of the sludge collecting machine shown in FIG. 1, and FIG. 3 is a perspective view of piping of the same sludge collecting machine.

As shown in the figure, eight suction pipes 5a are suspended from a girder 4 running on a rail 3 laid on a side wall 2 of a sedimentation tank 1, and each suction pipe 5a has a horizontal part 5b, a vertical discharge pipe 5c to form a siphon tube.

As shown in FIG. 3, each branch pipe 6 is connected to the horizontal part 5b of each siphon pipe, and a collecting pipe 7, which collects the branch pipe 6,
A vacuum pump 9 is connected via a vacuum tank 8.

Each siphon pipe is equipped with a vacuum gauge with contacts, and the collecting pipe 7
An electric valve 11 is attached to the .

When starting the operation of the siphon-type sediment collecting machine, the vacuum pump 9 is started to discharge the air in the siphon pipe to increase the degree of vacuum, and when the preset degree of vacuum is reached, the vacuum gauges 10 with contacts are activated. to stop the vacuum pump 9 and close the electric valve 11.

With the above operations, a siphon phenomenon is formed in the siphon tube,
Thereafter, even if the operation of the vacuum pump is stopped, the settled sludge is automatically sucked up and discharged into the waterway 12.

In such a conventional slurry sampling machine, a vacuum gauge with a contact is required for the number of siphon tubes, which is eight in the case of the illustrated slurry sampling machine, and if even one of the contacts malfunctions, automatic operation is impossible. It had the disadvantage of becoming

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a siphon-type mud collector equipped with a device that can automatically and reliably drive and stop a vacuum pump.

This purpose, according to the present invention, removes the contacts of the conventional vacuum gauge with contacts, makes it a simple vacuum gauge, and instead takes advantage of the fact that sludge enters the vacuum tank when the degree of vacuum increases,
This is achieved by providing a liquid level needle in the vacuum tank, which detects the liquid level in the vacuum tank and stops the vacuum pump.

The liquid level needle may be of any type as long as it can operate in conjunction with the on/off device of the vacuum pump, such as an electrode rod.

Next, the present invention will be explained in detail based on the drawings.

FIG. 4 is a perspective view of piping of a siphon-type sludge collector showing an embodiment of the present invention.

The same parts as in FIGS. 1 to 3, which show a conventional siphon-type sludge collecting machine, are designated by the same reference numerals.

That is, in the slurry sampling machine shown in FIG. 4, a vacuum gauge 13 is attached to each siphon tube instead of the vacuum gauge 10 with contacts shown in FIG.

These vacuum gauges 13 are simply for observing the degree of vacuum inside the siphon tube and are not involved in the automatic control of the vacuum pump, so even if these vacuum gauges fail, the operation of the sludge collecting machine will not be possible. It does not affect.

According to the invention, automatic control of the vacuum pump is performed by a level gauge 14 attached within the vacuum tank 8.

That is, when the vacuum pump 9 is started in order to form a siphon phenomenon in each siphon pipe at the start of operation, the air in the siphon pipes is discharged, and then the settled sludge is sucked up through the suction pipe 5a, and then pumped through the discharge pipe 5c. released.

At that time, a part of the settled sludge sucked up from the suction pipe 5a is
It enters the vacuum tank 8 via the branch pipe 6 and the collecting pipe 7.

When the liquid level of the sludge that has entered the vacuum tank 8 rises above a predetermined position, the liquid level gauge 14 is activated, the vacuum pump 9 is stopped, the electric valve 11 is closed, and the siphon phenomenon in each siphon pipe is maintained. Thereafter, the settled sludge is automatically sucked up and discharged into the waterway 12.

The liquid level gauge 14 is set to operate when a siphon phenomenon in each siphon pipe is suitably formed.

Although the above-mentioned embodiment shows a siphon-type slurry machine with a fixed suction pipe, a siphon-type slurry machine with a rotating suction pipe may also be used.

According to the present invention, since the vacuum pump can be controlled according to the liquid level of sludge in the vacuum tank, the number of contacts can be reduced and automatic control can be ensured.

[Brief explanation of drawings]

Figure 1 is a plan view of a conventional siphon-type slurry extractor, Figure 2 is a front view of the extractor shown in Figure 1, Figure 3 is a perspective view of the piping of the extractor shown in Figure 1, and Figure 4. FIG. 2 is a perspective view of the piping of the siphon-type mud collecting machine of the present invention. Explanation of symbols, 4...digit, 5a...suction pipe, 5c...discharge pipe, 7...collecting pipe,
8... Vacuum tank, 9... Vacuum pump, 13... Vacuum gauge, 14... Level gauge.

Claims (1)

[Claims] 1. A siphon-type sludge extraction system in which multiple siphon pipes are suspended from a girder running on the side wall of a sedimentation tank, one end of which is opened at the bottom of the sedimentation tank, and the other end is opened into a waterway installed in parallel to the sedimentation tank. In the machine, a liquid level needle is attached to the vacuum tank disposed in the middle of the pipe line connecting each siphon pipe and the vacuum pump, and the vacuum pump is driven and controlled by the liquid level needle. Siphon type mud extraction machine.