JP2755382B2 - Jet pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a jet pump used for a sand lifting device and the like. 2. Description of the Related Art In some cases, a jet pump is used as a means for lifting an object to be pumped up, such as sand settled at the bottom of a sand basin or sludge in a pit. A conventional jet pump generally has a structure shown in FIG. In FIG. 3, 1
Is a receiving tube, and the tip 1a is bent substantially in an L-shape.
Reference numeral 2 denotes a jet nozzle for jetting a jet stream to the straight portion 1b of the receiving tube 1, which is directly attached to the receiving tube 1, reference numeral 3 denotes a driving water pipe, and reference numeral 4 denotes an air pipe. A jet water stream containing air is jetted from the jet nozzle 2 into the receiving pipe 1, thereby sucking sand or sludge into the receiving pipe 1. Problems to be Solved by the Invention However, in the conventional jet pump as described above, the shape of the receiving tube 1 is complicated, the tip portion and the inside are liable to be clogged by foreign matters, etc. 2 has a problem that it is difficult to perform maintenance because it is directly mounted. An object of the present invention is to solve the above-mentioned problems of the conventional jet pump, and to provide a jet pump which is simple in structure, hardly causes blockage and the like, and can be easily repaired. Means for Solving the Problems The jet pump of the present invention for solving the above problems pumps up solid pump-up objects such as sand, sludge, and contaminants in a solid-liquid mixed state. There is a receiving pipe connected at one end to a pumping-up pipe through a connection part whose one end faces the object to be pumped up and has the same diameter as the body part and the other end expands, and an opening facing the opening of the receiving pipe. A jet nozzle for injecting a jet water stream into the receiving pipe to suck the pump-up object into the receiving pipe, and a driving water pipe having the jet nozzle disposed at the tip, so that the jet nozzle does not exist in the receiving pipe, The opening end of the receiving pipe and the opening end of the jet nozzle are arranged at a constant distance in the axial direction of the pipe, and the opening between both opening ends is opened over the entire circumference around the axis. . Operation With the above-described configuration, a jet nozzle water stream is jetted from a jet nozzle disposed in a receiving pipe opened to face the pump-up target object at a predetermined interval from an opening end of the receiving pipe, and By suctioning the surrounding pump-up object from the receiving pipe, it can be sent out through the lifting pipe, and the receiving pipe has a simple structure, there is little clogging of sand, impurities, etc. Are disposed facing each other at a fixed interval as described above, so that repair of each part of the apparatus can be performed very easily. Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2, reference numeral 11 denotes a jet pump according to an embodiment of the present invention, in which a receiving pipe 12 is vertically provided, one end (lower end) of which is opened downward, and the other end is a lifting pipe. Connected to 13. The lifting pipe 13 is guided to a sand separator (not shown). A jet nozzle 14 is attached to a lower end of a J-shaped driving water pipe 15 upward through a check valve 16 at a position facing the open end 12a of the receiving pipe 12 at a fixed interval, and
It is arranged so that a jet stream may be jetted into it.
An air pipe 17 is provided at the end of the jet nozzle 14 from the throttle 14a.
Is open. The upper part of the driving water pipe 15 is connected to the driving water supply pipe 1a via the driving water valve 18, but in the present embodiment, the driving water is supplied from near the connecting portion 12b between the receiving pipe 12 and the lifting pipe 13. There is a portion 15a between the vicinity of the valve 18. It is formed into a jacket shape through which the lifting pipe 13 and the air pipe 17 pass. Of course, the drive water pipe 15, the lift pipe 13, the air pipe 17, and other pipes may be independently piped. Reference numeral 20 denotes a closing plate at the lower end of the jacket-like portion 15a of the driving water pipe 15.
In addition, the backwash pipe 21 is opened near the open end 12a of the receiving pipe 12, that is, in an intermediate portion between the open end 12a and the closing plate 20. The backwash pipe 21 is also passed through the inside of the jacket-like portion 15a of the drive water pipe 15, like the lifting pipe 13 and the air pipe 17. A mode of using the jet pump 11 configured as described above will be described. For example, a pit 23 for settling sand 22 provided at the bottom of a sand basin,
The jet pump 11 having the above configuration is installed in the inside 22. The jet pump 11 is supported by a support 25 on a floor 24 located above the pit 23. A stirring water injection nozzle 26 is provided in the pit 23, and the stirring water is injected. First, the stirring water is injected from the stirring water injection nozzle 26, whereby the sand 22 in the pit 23 is stirred, the sand 23 is brought to the center of the pit 23, and simultaneously the driving water valve 18 is opened, the driving water is driven. The water enters the driving water pipe 15 from the water supply pipe 19, and is jetted from the jet nozzle 14 into the receiving pipe 12 via the check valve 16. Then, by the jet water stream 27 injected from the jet nozzle 14, the sand 22 around the receiving pipe 12 that has been stirred by the stirring water from the stirring water injection nozzle 26, together with the water, enters the receiving pipe 12 from the open end 12a. It is sucked, flows through the lifting pipe 13, and is sent to the sand separator. When the jet water stream 27 is jetted from the jet nozzle 14 as described above, air 28 is sucked into the jet nozzle 14 from the air pipe 17 that is opened to the atmosphere, and this air 28 is It is injected into the receiving tube 12. Injecting the jet water stream 27 in a state of being mixed with the air 28 in this manner has the effect of preventing the occurrence of cavitation in the receiving pipe 2. Note that a structure without the air pipe 17 may be adopted. As described above, the jet pump 11 can suck up sand and the like by a simple operation, the receiving pipe 12 has a simple structure, and is hardly clogged with sand, impurities, etc., even if clogging or blockage occurs. By supplying backwash water from the backwash tube 21, the water can be easily removed. Further, since the receiving pipe 12 and the jet nozzle 14 are separately provided at a fixed interval, repair of each part of the two can be performed very easily. A check valve 16 is provided below the jet nozzle 14.
Is provided, so that sand 22 and the like can be prevented from entering the driving water pipe 15. Effect of the Invention According to the present invention, jet water jets are jetted into a receiving pipe from a jet nozzle arranged opposite to the opening end of the receiving pipe at a fixed interval, thereby removing sand or the like around the receiving pipe. The object to be pumped up can be sucked in and sent out to the outside via the lifting pipe, which is easy to operate, the structure of the receiving pipe is simple, there is little clogging, and the receiving pipe and the jet nozzle are
As described above, since they are separately arranged facing each other with a predetermined interval therebetween, operations such as repair of each part of the apparatus, elimination of clogging, blockage, and the like can be performed extremely easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a jet pump according to an embodiment of the present invention, FIG. 2 is a front view around the jet pump shown in FIG. 1, and FIG. FIG. 11 ... jet pump, 12 ... receiving pipe, 12a ... open end, 13 ... lifting pipe, 14 ... jet nozzle, 15 ... drive water pipe, 16 ... check valve,
17 ... air pipe, 20 ... closing plate, 21 ... backwash pipe.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Chosaku Yamaguchi               Hisashi, 1-2-47 Shishitsuhigashi, Naniwa-ku, Osaka-shi               Yasuda Iron Works Co., Ltd. (72) Inventor Mikifumi Watanabe               Hisashi, 1-2-47 Shishitsuhigashi, Naniwa-ku, Osaka-shi               Yasuda Iron Works Co., Ltd.                (56) References JP-A-48-37707 (JP, A)                 Real opening sho 59-66031 (JP, U)                 58-162295 (JP, U)

Claims (1)

(57) [Claims] This pump pumps up solid pump-up objects such as sand, sludge, and contaminants in a solid-liquid mixed state. One end faces the pump-up object and opens to the same diameter as the body, and the other end expands. A receiving pipe connected to the lifting pipe via a connecting portion having a diameter, and a jet nozzle which opens opposite to the opening of the receiving pipe, injects a jet water flow into the receiving pipe, and sucks the pump-up object into the receiving pipe. A driving water pipe having the jet nozzle disposed at the tip thereof, and an opening end of the receiving pipe and an opening end of the jet nozzle are separated from each other at a predetermined distance in the axial direction of the pipe so that the jet nozzle does not exist in the receiving pipe. A jet pump, wherein the jet pump is arranged and opened between both open ends over the entire circumference around the axis.