JPH0343478B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to jet water pumps, such as those used, for example, to circulate and activate stagnant water.

[Conventional technology]

Generally, stagnant water in flood control ponds is circulated periodically to revitalize the water, but most of the circulation pumps used here use a drive source to rotate blades. It was a vane-type pump that used the centrifugal force to discharge the water it drew in.

[Problem to be solved by the invention]

When circulating stagnant water using a vane-type pump as described above, the rotation of the vanes generates centrifugal force, and this centrifugal force discharges the sucked water, so the pump efficiency is extremely low, resulting in a large amount of water. In order to circulate the water, a large pump with a large capacity is required, which is uneconomical due to high initial cost and running cost. In addition, there are many solid lumps such as illegally dumped ropes and fabrics in ponds, etc., and when these lumps are sucked into the pump, they tend to get entangled with the blades and cause the pump to malfunction, reducing its durability. There was also the problem that the The present invention was proposed in view of the above problems, and
It is an object of the present invention to provide a pump that is small in size yet capable of sucking in and discharging a large amount of water.

[Means to solve the problem]

In order to achieve the above object, the jet water pump according to the present invention has a suction port formed near the bottom of a tank in which a water intake port and a discharge port are formed, and an injection nozzle formed in the upper part of the tank. This system is characterized in that a high-pressure water generating pump is interposed in the middle of the connected water pipes, and a suction space is formed between the side end of the injection nozzle and the rear end of the discharge port.

[Effect]

When the high-pressure water flow from the high-pressure water generation pump is injected from the injection nozzle toward the rear end of the discharge port, the negative pressure created at the discharge port causes air or water in the tank to be sucked into the discharge port, and Water is sucked into the tank from the suction port. In this way, the amount of water discharged from the discharge port is the sum of the amount of water injected from the injection nozzle and the amount of water sucked into the discharge port by the negative pressure formed at the discharge port,
By sucking an amount of water into the tank from the water intake port that corresponds to the amount of water being discharged, a large amount of water can be sucked in and discharged with a small amount of high-pressure water flow. In addition, since the water in the tank that is sucked into the high-pressure water generation pump is a part of the water that was sucked in from the water intake, even if solid matter is sucked together with the water sucked into the tank from the water intake, the pressure will be high. The probability of water being sucked into the pump is also reduced, greatly improving durability.

【Example】

Embodiments of the present invention will be described below based on the drawings. Figure 1 shows a schematic configuration diagram of a water circulation device 2 that circulates and activates stagnant water in a flood control pond 1. Water discharged from the jet water flow pump 4 provided near the periphery of the water pond 1, the water pump 5 connecting the strainer 3 and the jet water flow pump 4, and the jet water flow pump 4 is returned to the flood control pond 1. It consists of a reflux tube 6. The above-mentioned jet water pump 4 is shown in Figs. 2 and 3.
As shown in the figure, a discharge pipe 9 forming a discharge port 8 on one side wall of a tank 7 formed in a sealed cylindrical container;
Water suction pipes 11 forming the water suction port 10 are attached to the top and bottom, respectively, and the starting end of the water suction pipe 11 is connected to the water pumping pipe 5, and the inner part of the tank 7 is bent so that the terminal end is directed upward. It is left open. The other side wall of the tank 7 has a suction port 1 near the bottom.
An "L"-shaped suction pipe 13 with openings 2 and 3 has an injection nozzle 14 attached to its upper part, and a water supply pipe 15 connects the suction pipe 13 and the injection nozzle 14.
A high-pressure water generating pump 17 driven by a motor 16 is interposed in the middle. The injection nozzle 14 has an injection port 18 narrowed to a small diameter.
The downstream side of the injection nozzle 14 is formed into a stepped large-diameter shape, and a small-diameter intake hole 19 for introducing outside air is formed in this large-diameter portion, and the terminal end of the injection nozzle 14 forms a discharge port 8.
It is arranged concentrically with the starting end of the discharge pipe 9, with a suction space S provided therebetween. When the injection nozzle 14 is formed into a mixed air jet in this way, air can be mixed into the water during circulation, and the air (oxygen) mixed in with the injection nozzle 14 activates microorganisms, resulting in stagnant water. The activation of water can be further promoted. The reference numeral 20 in the figure is a water inlet formed in the canopy 21 of the tank 7, which is normally closed when the jet water pump 4 is in operation. Further, reference numeral 22 in the figure is a wire mesh strainer stretched in the tank 7 to prevent solid matter from being sucked into the suction port 12.
2 also serves to fix the upper end of the water suction pipe 11. The operation of the jet water pump 4 constructed as described above will now be described. First of all, let's operate it for the first time after creating Tank 7,
Alternatively, if the tank 7 has been left unused for a long time and there is not enough water in the tank 7, after injecting water from the water inlet 20 to the height at which the suction port 12 in the tank 7 is submerged (for example, as indicated by the dashed-dotted line A), the motor 16 The high pressure water generation pump 17 is driven. Then, by driving the high pressure water generation pump 17,
The water in the tank 7 sucked from the suction port 12 through the suction pipe 13 becomes high-pressure water and is injected from the injection nozzle 14 toward the discharge pipe 9 to form a negative pressure inside the discharge pipe 9. The negative pressure generated in the discharge pipe 9 acts on the tank 7 and sucks a large amount of water from the water suction pipe 11 into the tank 7.
The water level inside the tank will rise rapidly and return to the specified height. When the water level in the tank 7 rises from the position indicated by the dashed line A in FIGS. 2 and 3 to the specified position indicated by the solid line B, the water is sucked from the suction space S to the discharge port 8 by the negative pressure generated in the discharge pipe 9. . Therefore, the amount of water discharged from the discharge pipe 9 is the sum of the amount of water injected from the injection nozzle 14 and the amount of water sucked into the discharge pipe 9 due to negative pressure. It is possible to aspirate and discharge water. Here, the height of the tank 7 is determined to be a height at which the negative pressure generated in the discharge pipe 9 by being injected from the injection nozzle 14 toward the discharge pipe 9 and the head of water sucked up into the tank 7 are balanced. However, if the height of the tank 7 is to be lowered, the pressure of the high-pressure water injected from the injection nozzle 14 toward the discharge pipe 9 can be lowered to reduce the negative pressure. This makes it possible to balance the water head sucked up into the tank 7. Furthermore, if the water level sucked into the tank 7 changes due to negative pressure, for example, if it instantaneously rises above the discharge pipe 9, the high-pressure water injected from the injection nozzle 14 toward the discharge pipe 9 The rising water is forced into the discharge pipe 9 and is discharged from the discharge pipe 9 to the outside of the tank 7, so that the rising water level in the tank 7 immediately falls. Conversely, if the water level in the tank 7 falls below the prescribed position indicated by the solid line B for some reason, the negative pressure in the tank 7 becomes stronger than the weight due to the water head. As a result, a large amount of water is sucked in from the water suction pipe 11 and the tank 7
This causes the water level inside the tank to rise rapidly to a specified level. When these actions are repeated and the water level in the tank 7 is maintained at the specified position indicated by the solid line B, when the water is circulated by the jet water flow pump 4, it comes into contact with a large amount of air during the circulation, causing stagnation in the pond. Air is introduced into the water, promoting the activation of microorganisms and purifying the stagnant water. 4 and 5 respectively show modifications of the above embodiment, and the one in FIG. 4 shows a portion of the tank 7 near the water suction pipe 11 fixed near the bottom of the tank 7.
A partition wall 23 is formed inside the tank 7 so that the water intake port 10 is opened at the upper part of the tank 7. In the system shown in FIG. 5, a suction space forming part 25 is formed in the upper part of the tank 7 via an on-off valve 24, and a discharge pipe 9 and high-pressure water are connected to the suction space forming part 25 instead of the air mixture jet. The injection nozzle 14 for injecting only the water is attached with a suction space S provided. In such a case, there is an advantage that when the negative pressure in the tank 7 becomes too high, the high-pressure water injected from the injection nozzle 14 can be prevented from flowing backward into the tank 7 by closing the on-off valve 24. be.

【Effect of the invention】

As explained above, according to the jet water flow pump of the present invention, a large amount of water can be sucked in from the water intake port with a small amount of high pressure water flow generated by the high pressure water generation pump, and a large amount of water can be discharged from the discharge port. As a result, the high-pressure water generating pump can be small-sized, and the pump efficiency can be increased to significantly reduce initial costs and running costs. In addition, even if solid matter is sucked into the tank together with water, only a portion of the water in the tank will be sucked into the high-pressure water generation pump, so the probability of solid matter being sucked into the pump is greatly increased. This has the advantage of extremely high durability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram showing how the water circulation device is used, FIG. 2 is a partially cutaway front view of the water circulation device, and FIG. 3 is a vertical cross-sectional side view of the tank. 4 and 5 are longitudinal sectional front views showing different modifications, respectively. S...Suction space, 7...Tank, 9...Discharge pipe, 11...Water intake port, 12...Suction port.

Claims (1)

[Claims] 1 A suction port is formed near the bottom of a tank in which a water intake port and a discharge port are formed, and an injection nozzle is formed at the top,
A high-pressure water generation pump is interposed in the middle of a water pipe connecting the suction port and the injection nozzle, and a suction space is formed between the tip of the injection nozzle and the rear end of the discharge port. Jet water pump.