JPS63187000A - Control method for sand lifting device - Google Patents

Abstract

PURPOSE:To reversely operate a jet pump at the optimum timing by providing a pressure meter in the middle of a sucking pipe, detecting a clog generated in the sucking pipe or a receiving pipe based on the pressure value in the sucking pipe measured by this pressure meter, and reversely operating the jet pump. CONSTITUTION:When a clog is generated in a sucking pipe 6, a pump-up object does not flow into the sucking pipe 6, on the other hand the suction force of a jet water spout C is applied in the sucking pipe 6, the pressure in the sucking pipe 6 is further decreased, and the pressure value measured by a pressure meter 23 becomes a fixed value or less. When a clog is generated in a receiving pipe 4, the jet water spout C in the sucking pipe 6 tends to be spouted, thus the pressure value in the sucking pipe 6 measured by the pressure meter 23 becomes higher than the fixed value. Therefore, it can be detected that a clog is generated in the sucking pipe 6 or the receiving pipe 4. If a jet pump is reversely operated when this clog is detected, the clog can be released adequately without forcing an unnatural action to the jet pump after the clog is generated.

Description

[Detailed description of the invention] Industrial applications The present invention utilizes a 117 control method for a 58-sand R1ff.

BACKGROUND OF THE INVENTION A jet pump can be used to lift objects to be pumped up, such as sand settled in a settling basin or sludge in a bit. Conventional jet pumps eject a jet stream from a jet nozzle toward a receiving tube, and utilize the negative pressure generated around the jet within the receiving tube to pass through the receiving tube and face the object to be pumped up. There are devices that allow the object to be pumped up to be sucked in through an open suction pipe.

However, in conventional jet pumps such as those mentioned above, if the gold sand ratio, which is the ratio of sand contained in the jet water in the receiving pipe, becomes too high, the piping may become clogged with sand, and this blockage can be removed by wI. Because of this, the jet pump was backflowing.

Problems to be Solved by the Invention However, in the past, it has not been possible to detect in a timely manner that a blockage has occurred in the pipe. There were 7 problems that forced unreasonable operation.

Therefore, the present invention detects blockages occurring in piping in a timely manner,
vJW, a sand pumping device that reverses flow from a jet pump at the optimal time
The purpose is to provide 11 methods.

Means for Solving the rlJ Problems In order to solve the above problems, the present invention injects a jet of water into a receiver pipe, communicates with the receiver pipe, and inserts a jet into a suction pipe that opens facing the object to be pumped up. In a jet pump that generates negative pressure and uses this negative pressure to suck up the pump-up counter-dyed material into the suction pipe, a pressure gauge is provided in the middle of the suction pipe, and the pressure value in the suction pipe is measured by this pressure gauge. The structure is such that a blockage occurring in the suction pipe or the receiving pipe is detected and the jet pump is backwashed.

Operation In the above configuration, in a normal state in which the object to be pumped up is sucked up into the suction pipe by negative pressure, the pressure value in the suction pipe measured by the pressure gauge becomes a constant value of negative pressure. If a blockage occurs in the suction pipe, the suction pipe will be blown up! Materials no longer flow in, and on the other hand, the suction force of the jet water acts on the suction pipe, so the pressure inside the suction pipe further decreases, and the pressure value determined by the pressure gauge #I becomes a value below the above-mentioned certain value. becomes. Further, when a blockage occurs in the receiving pipe, a jet of water tends to flow into the suction pipe, so that the pressure value inside the suction pipe measured by the pressure gauge becomes higher than the above-mentioned constant value. Therefore, when a blockage occurs, the pressure value in the suction pipe measured by the pressure gauge fluctuates from the constant value of the negative pressure, so it is possible to detect that VA cold has occurred in the suction pipe or the receiving pipe. and,
By backwashing the jet pump when this blockage is detected, the blockage can be released in a timely manner without forcing the blockage-preventing jet pump to operate unreasonably.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. In FIGS. 1 to 3, a bit 2 for settling sand 1 as a pump-up object is provided at the bottom of the settling basin. A jet pump 3 is provided at a position corresponding to the bit 2 so as to extend from above the water surface into the sand 1 in the sand settling basin. A receiving pipe 4 and a jet nozzle 5 are connected to each other in the lower part of the jet pump 3, and a suction pipe 6 whose lower end is open is branched and provided near the connecting part of the receiving pipe 4. . A sand pumping pipe 7 is connected to the receiving pipe 4 43.
A discharge pulp 8 is provided downstream of the sand pumping pipe 7. Drive lr connected to jet nozzle 5! ! The upstream side of 9 is connected to a driving water tank 12 via a jet water supply pulp 10 and a driving water pump 11 for adjusting the flow rate of driving water. Further, a bypass pipe 13 and a backwash water pipe 14 branch off from the middle of the drive pipe 9 between the drive water pump 11 and the jet water supply valve 10. The bypass pipe 13 is
A jet water pulp 15 is interposed, the pipe extends to a position corresponding to the bit 2, and further branches into a first branch pipe 16, a second branch pipe 17, and a third branch pipe 18. First branch pipe 16
is an injection nozzle 19 arranged near the opening of the suction pipe 6.
The second branch pipe 17 is connected to the vicinity of the opening of the suction pipe 6, and the third branch pipe 18 is connected to the lower end of the receiver ff4. Although it is usually sufficient to use only one branch pipe 6, a combination of two or more branch pipes can also be used. The backwash water pipe 14 is connected to the upper part of the vertical pipe portion of the sand pumping pipe 7 with a backwash pulp 20 interposed therebetween. An air pipe 21 is located near the open oil of the jet nozzle 5.
are connected. The upstream side of the air pipe 21 is connected to an air supply source via an air pulp 22. A pressure gauge 23 is provided in the middle of the suction pipe 6 to measure the pressure inside the suction pipe 6.

In the above configuration, when lifting sand, the discharge pulp 8, the jet water supply valve 10, the jet water pulp 15, and the air pulp 22 are interposed, and the backwash pulp 20 is closed. In this state, the jet nozzle 5 is supplied from the driving water tank 12 by the driving water pump 11 through the driving VJ pipe.
The driving water A supplied to the jet nozzle 5 sucks the air B supplied from the air pipe 21 to the jet nozzle 5, becomes a jet water jet C, and is injected into the receiver pipe 4. Then, due to the jet water flow C flowing into the receiving pipe 4, the suction pipe 6
Negative pressure is generated within the suction pipe 6, and the sand 1 is sucked up into the suction pipe 6. At this time, the gold sand ratio, which is the proportion of sand 1 in the suction pipe 6 and the receiving pipe 4, is maintained at an appropriate level by the injection water supplied through the bypass pipe 13. In the normal state where sand is sucked up into the suction pipe 6, the pressure value inside the suction pipe 6 measured by the pressure gauge 23 is as follows.
The negative pressure becomes a constant value Pa. However, in the unlikely event that d
3, if a blockage occurs, the sand 1 will no longer flow into the suction pipe 6, and on the other hand, the suction force by the jet water jet C will act on the suction pipe 6, so the pressure inside the suction pipe 6 will further decrease. , the pressure value measured by the pressure gauge 23 becomes less than the value Pa set in consideration of the permissible range.Furthermore, if a blockage occurs in the receiving pipe 4, the jet water stream C tries to flow into the suction pipe 6. Therefore, the pressure value inside the suction pipe 6 becomes equal to or higher than the value Pb set in consideration of the allowable range. Therefore, if a blockage occurs, the pressure value inside the suction pipe 6 measured by the pressure gauge 23 will be a value other than Pa<Po<Pb, so that it is possible to detect the occurrence of a blockage in the suction pipe 6 or the receiving pipe 4 in a timely manner. Can be detected. When this blockage is detected,
Discharge valve 8, air valve 22 and jet water supply valve 1
0 and the water injection valve 15 are opened, the backwash valve 20 is opened and the sand is lifted t! 17 and the receiving pipe 4 to backwash the inside of the jet pump 3 and release rJi clogging in the pipe due to sand.

Note that the section A in this embodiment may have another configuration. For example, FIG. 4 shows another embodiment of the section A in FIG. Then, the skirt portion 25 is formed. At the lower end of the skirt portion 25,
A driving water chamber 27 having a suction pipe 26 fitted inside the skirt portion 25 is connected thereto.

A driving ice chamber 27 is connected to a driving vJ tube 9. A jet outlet 29 is formed between the upper end edge of the suction pipe 26 and the skirt portion 25 . A pressure gauge 23 is provided in the middle of the suction pipe 2G.

Further, as shown in FIG. 5, the skirt portion 25 and the driving ice chamber 27 are integrated, and a first air pipe 3
0 is connected to the first air chamber 3 which communicates with the suction pipe 26.
1, a second air chamber 33 connected to the second air pipe 32 and communicated with the receiving pipe 4 is provided at the upper part of the skirt portion 25, and a pressure gauge 23 is provided in the middle of the suction pipe 26. good. Furthermore, as shown in FIG. 6, the skirt portion 25 may be provided separably from the receiving pipe 4, and the skirt portion 25 and the driving water chamber 27 may be provided separably. In this case as well, the pressure gauge 23 is provided in the middle of the suction pipe 26. Even in the above case, the effect on the pressure gauge 23 is the same as in the embodiment shown in FIGS. 1 to 3.

Effects of the Invention As described above, according to the present invention, the pressure nozzle yi? provided in the middle of the suction pipe. The occurrence of rJ1 blockage in the suction pipe or receiver pipe can be detected in a timely manner by the pressure value measured by t, and the jet pump can be backwashed in a timely manner.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of section A in Fig. 1, Fig. 3 is a view taken along the a-a arrow in Fig. 2, and Figs. FIG. 6 is an enlarged sectional view showing another embodiment of section A in FIG. 1...Sand, 3...Jet pump, 4...Receiver pipe,
5... Jet nozzle, 6, 26... Suction pipe, 7.
... Sand pumping pipe, 9... Drive water pipe, 13... Bypass pipe, 14... Backwash water pipe, 21... Air pipe, 23...
Pressure gauge. Agent Yoshihiro Morimoto Figure 1 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. Inject a jet of water into a receiving pipe to create a negative pressure in a suction pipe that communicates with the receiving pipe and opens facing the object to be pumped up, and this negative pressure causes the object to be pumped up to be sucked in. In a jet pump that sucks air into a pipe, a pressure gauge is provided in the middle of the suction pipe, and a blockage occurring in the suction pipe or the receiving pipe is detected from the pressure value in the suction pipe measured by the pressure gauge, and the jet pump A method for controlling a sand pumping device characterized by causing reverse flow of the sand.