JPH0674800B2 - Jet pump - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet pump used in a sand lifting device and the like.

2. Description of the Related Art A jet pump may be used as a means for lifting a pump-up target 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. That is, in FIG. 7, reference numeral 1 is a receiving pipe, and the tip portion 1a is bent in an approximately L shape. Reference numeral 2 denotes a jet nozzle for injecting a jet water stream onto the straight portion 1b of the receiving pipe 1, which is directly attached to the receiving pipe 1,
Reference numeral 3 is a driving water pipe, and 4 is an air pipe. A jet water flow mixed with air from the jet nozzle 2 is jetted into the receiving pipe 1 to suck sand, sludge or the like into the receiving pipe 1. However, in such a conventional jet pump, since the shape of the receiving pipe 1 is complicated, the tip portion and the inside are apt to be clogged due to foreign matters, and the jet nozzle 2 is directly attached to the receiving pipe 1. , There is a problem that maintenance is difficult.

As a jet pump that solves the problems of the conventional jet pump described above, a separation type jet pump as shown in FIG. 8 is about to be put into practical use. That is, the eighth
In the figure, a receiving pipe 5 that faces downwardly facing a pump-up object such as sand or sludge, and an opening end 5a of the receiving pipe 5 are arranged facing upward at a constant interval, and the receiving pipe 5 Formed by a jet nozzle 6 that jets a jet water flow to suck sand, sludge, etc. into the receiving pipe 5, a drive water pipe 7 that sends drive water to the jet nozzle 6, and an air pipe 8 that blows air to the jet nozzle 6. Has been done.

Problems to be Solved by the Invention In the jet pump shown in FIG. 8 described above, since the receiving pipe 5 and the jet nozzle 6 are of a separation type in which they are opposed to each other at a constant interval, the receiving pipe 1 shown in FIG. Compared to a so-called integral type in which the jet nozzle 2 is directly attached to the, the receiving pipe 5 has a simple structure and is less likely to be clogged, and since the receiving pipe 5 and the jet nozzle 6 are separated, repair of each part, It has an advantage that it is extremely easy to eliminate clogging. However, on the other hand, since the receiving pipe 5 and the jet nozzle 6 are separated and the jet nozzle 6 is provided upward, sand, sludge and the like enter the jet nozzle 6 while the jetting of the driving water is stopped, and the driving water pipe There is a problem that 7 is blocked.

The present invention provides a jet pump which solves the above-mentioned problems in the separation type jet pump as shown in FIG. 8 and has a simple structure and can surely prevent blockage due to sand or the like. The purpose is.

Means for Solving the Problems In order to solve the above-mentioned problems, a jet pump of the present invention has a receiving pipe whose one end faces a pump-up object and is open, and the other end is connected to a lifting pipe, and the receiving pipe. A jet nozzle that faces the opening end at a constant interval and injects a jet water flow into the receiving pipe to suck the pump-up object into the receiving pipe,
It is characterized in that it comprises a drive water pipe having the jet nozzle arranged at its tip and a check valve provided in a pipe line formed by the jet nozzle and the drive water pipe.

Action With the above configuration, the jet water jet is jetted from the jet nozzle, which is disposed facing the pump-up target object in the receiving pipe that is opened and faces the opening end of the receiving pipe at a constant interval, thereby It is possible to inhale the surrounding pump-up target from the receiving pipe and send it out through the lifting pipe.The structure of the receiving pipe is simple, there is little clogging of sand and foreign matters, and the receiving pipe and the jet nozzle are As described above, the check valves are provided so as to face each other at a constant interval, and the check valve is provided in the pipe line formed by the driving water pipe and the jet nozzle.
It is possible to reliably prevent a pump-up object such as sand from entering from the jet nozzle into the drive water pipe and block it, and it is possible to extremely easily repair each part of the device.

Embodiment An embodiment of the present invention will be described with reference to FIGS. That is, in FIG. 1 and FIG. 2, 11 is a jet pump of one embodiment of the present invention, in which a receiving pipe 12 is erected vertically, one end (lower end) of which is opened downward and the other end is It is connected to the lifting pipe 13. The lifting pipe 13 is led to a lifting sand separator (not shown). A jet nozzle 14 is attached upward at a lower end of a J-shaped drive water pipe 15 via a check valve 16 at a position facing the open end 12a of the receiving pipe 12 at a constant interval. It is arranged so that it can jet a jet of water. The check valve 16 may be provided in the drive water pipe 15.

Details of the check valve 16 are as shown in FIGS. 3A and 3B. That is, in FIGS. 3A and 3B, reference numerals 17 and 17 denote upper and lower mounting flanges, and a cross-shaped frame 18 is provided between both mounting flanges 17 and 17. Inside the frame 18, a pair of flap valves 20, 20 that are opened and closed around a support shaft 19 using bolts are provided.The flap valves 20, 20 are
The tubular member 21 formed on the lower flange 17 can be closed by its own weight. A stopper bolt 22 for hitting the flap valve 20 and adjusting the opening of the flap valve 20, 20 is attached to the frame 18. The flap valve 20,2
0 can be opened by the water flow from below and can be closed by its own weight when the water flow is stopped.

FIG. 4 shows a second example of the check valve 16. That is, the opening 27 of the lower mounting seat 24 is closed by the weight of the sphere 26 in the water passage 25 provided between the upper and lower mounting seats 23 and 24. Reference numeral 28 is a stopper that hits the sphere 26 and prevents the sphere 26 from rising. 29 also opens the sphere 26
It is a guide to 27 centers. The sphere 26 floats by the water flow from below and allows the water flow to pass through, and when the water flow stops, it descends due to its own weight and closes the opening 27.

FIGS. 5A and 5B show a third example of the check valve 16, which is adapted to be opened and closed by moving the sphere up and down similarly to the second example. That is, due to the weight of the sphere 33 in the water passage 32 provided between the upper and lower mounting seats 30 and 31, the lower mounting seat 31
The opening 34 is closed. Reference numeral 35 denotes a stopper that hits the sphere 33 and prevents the sphere 33 from rising, and a plurality of stoppers are provided radially. Reference numeral 36 is a guide for guiding the sphere 33 to the center of the opening 34. Similar to the ball 26 of the check valve shown in FIG. 3, the sphere 33 floats by the water flow from below and allows the water flow to pass through, and when the water flow is stopped, it descends by its own weight to close the opening 34.

Check valve spheres 26 and 33 shown in FIGS. 4 and 5 above.
It is preferable that the specific gravity is 3 to 7 which is larger than 2.5 to 3 of sand from the viewpoint of the close-moving property. Normally, metal balls are used, but as shown in FIG. Those coated with a rubber 36 are suitable.

Next, referring to FIGS. 1 and 2, the jet nozzle 14
An air tube 37 is opened at the tip of the. The upper part of the driving water pipe 15 is connected to the driving water supply pipe 39 via the driving water valve 38, but in the driving water pipe 15 of the present embodiment, the connecting portion 12b between the receiving pipe 12 and the lifting pipe 13 is connected. A portion 15a between the vicinity and the vicinity of the driving water valve 38 has the lifting pipe 13 and the air pipe 37 inside thereof.
It is formed like a jacket through. Of course drive water pipe
The 15, the lifting pipe 13, the air pipe 37, and other pipelines may be independently provided. Reference numeral 40 is a closing plate at the lower end of the jacket-like portion 15a of the driving water pipe 15. In addition, the open end 1 of the receiving pipe 12
A backwash pipe 41 is opened in the vicinity of 2a, that is, in the intermediate portion between the open end 12a and the closing plate 40. Like the lift pipe 13 and the air pipe 37, this backwash pipe 41 also has a jacket-like portion 15a of the drive water pipe 15.
Has been passed through. In addition, the air pipe 37 and the backwash pipe 41
May be provided as needed.

A mode of using the jet pump 11 configured as described above will be described. For example, a sand pit 43 at the bottom of a sand basin for sinking the sand 42
The jet pump 11 having the above-mentioned configuration is installed in 42. The jet pump 11 is supported by a support body 45 on a floor 44 located above the pit 43. A stirring water injection nozzle 46 is provided in the pit 43.

First, stirring water is jetted from the stirring water jet nozzle 46, whereby the sand 42 in the pit 43 is stirred, the sand 42 is brought close to the center of the pit 43, and at the same time, the driving water valve 38 is opened to drive the driving water. Enter the drive water pipe 15 from the water supply pipe 39, push up the flap valve 20, 20 of the check valve 16 or the sphere 26 or 33,
It is jetted from the jet nozzle 14 into the receiving pipe 12. And
By the jet water flow 47 jetted from the jet nozzle 14, the sand 42 around the receiving pipe 12 which was being stirred by the stirring water from the stirring water jet nozzle 46 is opened together with the water at the opening end 12a.
Is sucked into the receiving pipe 12, flows through the lifting pipe 13, and is sent to the lifted sand separator. Further, when the jet water flow 47 is jetted from the jet nozzle 14 as described above, air is sucked into the jet nozzle 14 from the air pipe 37 that is opened to the atmosphere, and this air is received together with the jet water flow 47. It is injected into 12. Injecting the jet water flow 47 in a mixed state with air in this way has the effect of preventing the occurrence of cavitation in the receiving pipe 12. Next, by stopping the supply of driving water, the jet water flow from the jet nozzle 14
When the injection of 47 is stopped, the flap valve 20 of the check valve 16 or the sphere 26 or 33 is closed by its own weight, which prevents the sand 42 from entering the drive water pipe 15.

As described above, the jet pump 11 can suck up the sand 42 and the like by a simple operation, the receiving pipe 12 has a simple structure, and the clogging of sand, foreign matters, etc. does not easily occur, and even if clogging or blockage occurs However, it can be easily removed by supplying the backwash water from the backwash pipe 41. Further, since the receiving pipe 12 and the jet nozzle 14 are provided separately at a fixed interval, it is possible to extremely easily repair the respective parts of both, and the check valve 16 is provided below the jet nozzle 14. Is provided, the entry of sand 42 and the like into the drive water pipe 15 is prevented.

EFFECTS OF THE INVENTION According to the present invention, by jetting a jet water flow into the receiving pipe from the jet nozzle, which is disposed so as to face the opening end of the receiving pipe with a constant interval, sand around the receiving pipe is removed. It can suck up the object to be pumped up and send it out through the lifting pipe, the structure of the receiving pipe is simple, there is little clogging of sand, foreign matters, etc., and the receiving pipe and the jet nozzle are as described above,
Since the check valves are provided facing each other with a certain distance and between the drive water pipe or between the drive water pipe and the jet nozzle, sand or the like may enter the drive water pipe from the jet nozzle. It is possible to reliably prevent the pipe line from being blocked, and it is possible to extremely easily carry out operations such as repair of each part of the device, elimination of clogging, blockage and the like.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention, FIG. 2 is a front view around the jet pump shown in FIG. 1, FIG. 3 is an example of a check valve, A is a plan view, and B is Fig. 4 is a vertical cross-sectional view, Fig. 4 is a vertical cross-sectional view showing another example of the check valve, Fig. 5 is a still another example of the check valve, A is a vertical cross-sectional view, and B is the I-I line of A. A sectional view, FIG. 6 is a sectional view of a sphere used in the check valve illustrated in FIGS. 4 and 5, and FIG. 7 is a longitudinal sectional view showing an example of a conventional receiver-jet nozzle integrated jet pump. FIG. 8 is a longitudinal sectional view showing an example of a conventional receiver-jet nozzle separated type jet pump. 11 …… Jet pump, 12 …… Receiver tube, 12a …… Open end, 1
3 …… lifting pipe, 14 …… jet nozzle, 15 …… driving water pipe, 1
6 …… Check valve, 20 …… Flap valve, 22 …… Stopper bolt, 26,33 …… Sphere, 27,34 …… Opening, 28,35 …… Stopper.

Front Page Continuation (72) Inventor Nagasaku Yamasaku 1-47 Shikitsu East, Naniwa-ku, Osaka City, Osaka Prefecture Kubota Iron Works Co., Ltd. 2-47, Kubota Iron Works Co., Ltd. (56) Reference JP-A-59-74400 (JP, A) JP-A-59-15699 (JP, A) JP-B-36-17879 (JP, B1)

Claims (1)

[Claims] 1. A receiving pipe, one end of which is open to face the object to be pumped up and the other end of which is connected to a lifting pipe, and a jet water stream is jetted into the receiving pipe by facing the opening end of the receiving pipe at a constant interval. A jet nozzle for sucking the object to be pumped up into the receiving pipe, a drive water pipe having the jet nozzle at its tip, and a check valve provided in a pipe line formed by the jet nozzle and the drive water pipe. A jet pump characterized by that.