JPH02102400A - Sand lifting pump - Google Patents

Abstract

PURPOSE:To obtain a large pump head in spite of small power by providing the captioned pump with a nozzle, which spouts out pressure water in the carrying direction of a tubular water passage, and another nozzle, which spouts out air, thereby giving the pump both pumpability by pressure water and that by air. CONSTITUTION:The lower end 11 of a sand lifting pipe 1, which is placed in a sand basin 8 and which has diameter and length as required, is formed into a bell-shape. Air supply chambers 9 are formed at the lower and the middle-part peripheries of this sand lifting pipe 1, respectively, and air nozzles 10 are installed, so that air is gushed out from each air supply chamber 9 into the sand lifting pipe 1. At the same time, air with high pressure as required is supplied from an air supply pipe 3 to each air supply chamber 9. In addition, a high pressure water supply chamber 12 is provided at the periphery, which is located below the lower air supply chamber 9, of the sand lifting pipe 1, so that the high pressure water supplied from a high pressure water supply pipe 5 spouts out into the sand lifting pipe 1 via a nozzle 13.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is suitable for lifting and transporting sewage sediment containing solid matter such as sand and pebbles that cause wear and fibers that cause entanglement. This relates to sand pumps.

[Conventional technology]

Sewage sewage sand contains not only sand but also pebbles, paper, and other fibrous materials, and screw pumps and vertical pumps are not suitable for pumping this sand. sand.

Pebbles caused severe wear on the mechanical drive unit, making it unusable.
Additionally, long fibers can become entangled with rotating parts, rendering the machine inoperable. For this reason sand, pebbles.

For transporting sewage waste containing fibers, a pump that uses fluid is advantageous in preventing wear and tangles as described above.

Pumps that utilize this fluid include (1) air lift pump (see Figure 4), (2) jet pump (see Figure 5), and (3) air mixture pump (see Figure 6).

[Problem to be solved by the invention]

As shown in Fig. 4, the air lift pump is equipped with an air nozzle 2 on the inner peripheral side near the lower end suction port of a sand lifting pipe 1 having a required diameter and length, and supplies high-pressure air from the air nozzle 2 through an air supply pipe 3. It is ejected into the pipe and uses the rising force of air bubbles inside the pipe to raise the sediment containing pebbles, fibers, etc. from the lower end of the pipe through the suction port at the bottom of the pipe and discharge it. A large lift is not possible, and the flow velocity due to the upward force of the air is slow, making it impossible to lift large objects, and there are limits to its performance as a pump.

In addition, as shown in Fig. 5, a typical jet pump has a high-pressure water injection nozzle 4 facing upward instead of an air nozzle near the lower end of the sand-lifting vibrator 1, and high-pressure water is guided from a high-pressure water supply pipe 5. , is injected into the vibrator, which generates an upward water flow inside the pipe and discharges the sediment.

For this reason, the flow rate is faster than that of an air lift pump, and a large head pump is possible, but it requires a large amount of power, that is, a large amount of power to send high-pressure water, and the running cost becomes high.

As shown in FIG. 6, the Zarani air mixture jet pump has an air mixture chamber 6 connected to a part of the sand lifting vibrator 1, and high pressure air supplied from an air supply pipe 3 is injected into this air mixture chamber from an air nozzle 2. ,
High-pressure water supplied from the high-pressure water supply pipe 5 is injected from the nozzle 4, and after mixing this high-pressure water and air in the air mixture chamber, it is injected into the vibrator 1 through the nozzle 7.
This method generates rising water flow within the tank to lift and discharge sand. Pump performance is most affected by the jet flow from nozzle 7, so
As a result of placing emphasis on water flow, the amount of air supplied cannot be adjusted, the air lift effect is insufficient, and a large amount of high-pressure water is required, resulting in high running costs.

It is an object of the present invention to solve these drawbacks and to provide a sand pump suitable for pumping and discharging sewage waste sand.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a sand pump that is equipped with a nozzle that spouts pressure water in the transport direction of a vib-shaped waterway that constitutes the sand pump, and a nozzle that spouts air, and has a pumping action using pressure water. , it is characterized by having a pumping action by air.

[For production]

Combines the effects of jet pump and air lift pump,
Moreover, since the apparent specific gravity of the conveyed object is lowered and the jet pump bombardment is applied thereto, a large head can be obtained with less power.

〔Example〕

Next, the sand pump of the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 3.

The lower end 11 of the sand pumping pipe 1, which has the required diameter and length in a sand settling pond 8 of a sewage treatment plant, has its lower end widened in a morning glory shape to make it easier to suck in the sand, and is directed toward the bottom of the pond and near the bottom. The discharge side of the upper end of the vibrator 1 is arranged so as to reach a position higher than the water surface WL, so that the lifted sand can be carried out and discharged to the oily area.

In FIG. 1, air supply chambers 9 are provided on the outer periphery of the lower part and the outer periphery of the middle part of the sand-lifting vibrator 1, and an air nozzle 10 is provided so as to blow air from the air supply chambers 9 into the sand-lifting vibrator. Required high pressure air is supplied to each of the air supply chambers 9, 9 from the air supply pipe 3. Furthermore, a high-pressure water supply chamber 12 is provided on the outer periphery of the vibrator at a position below the lower air supply chamber 9, and high-pressure water is supplied from the high-pressure water supply pipe 5, and this high-pressure water is introduced into the sand-lifting vibrator 1 through a nozzle 13. The high-pressure water jetted from a nozzle 13 sucks water along with sediment on the downstream side, and reaches the conveyed object into which air is jetted before the flow velocity decreases.

Since the conveyed material in the sand-lifting vibrator 1 into which air is injected has a light apparent specific gravity, the attenuation of high-pressure water is small and the jet pump exerts greater power. Such air nozzle 10
．． It is desirable that the nozzle 13 be provided so as to face in the sand transport direction, that is, upward.

In the embodiment shown in FIG. 1, by injecting high-pressure water upward into the pipe from the nozzle 13 into the lower part of the sand-lifting vibrator, an upward water flow is generated in the pipe, and the suction port at the lower end of the vibrator is Negative pressure is generated. Under this negative pressure, the settled sand is sucked into the pipe together with the surrounding sewage, and is lifted up by the rising water flow. Air is ejected from the air nozzle 10.10 in two stages above this nozzle 13 into the sand-lifting vibrator, so an air lift effect is generated, the upward flow is promoted, and the water flow is fast and A large lifting head can be obtained. Furthermore, the synergistic effect of the high-pressure water injection and the air lift effect can reduce the amount of air jetted and the amount of high-pressure water jetted out, thereby improving the sand lifting efficiency.

In the embodiment shown in FIG. 2, an air supply chamber 9 and a high pressure water supply chamber 12 are disposed on the lower outer periphery and the upper outer periphery of a sand pumping pipe 1 having a suction port 11 at the lower end, respectively. A high-pressure water supply pipe 5 is installed, air and high-pressure water are supplied in the same manner as in the embodiment shown in FIG. The synergistic effect with the upward flow caused by the jet generates an efficient upward flow within the sand lifting pipe to lift sand. In addition, in this example, the weight of the object to be conveyed by the sand-lifting vibrator I can be further reduced, making it possible to create an energy-saving, high-head pump. In the embodiments shown in FIGS. 1 and 2, the diameter of the sand lifting vibrator 1 is the same from the lower part to the upper part, except for the suction port at the lower end, but in the example shown in FIG. The diameter increases gradually towards the top.

Using this stepped part, a high pressure water supply chamber 12 and an air supply chamber 9 are provided on the outer circumference of the pipe, and the nozzle is arranged such that the high pressure water and air are directed upwardly into these chambers 12 and 9 and toward the center of the pipe. 13.10 is provided to obtain the same effect as the embodiments shown in FIGS. 1 and 2. By changing the diameter stepwise in this way, it is possible to make the sand lifting vibrator a straight pipe and to make the vector of the jet flow the same as the conveyance direction.

〔Effect of the invention〕

Therefore, in conventional mixed air jet pumps, the air introduction is determined by the flow rate of high-pressure water, making it difficult to efficiently achieve the air lift effect.However, the sand pump of the present invention separates air and high-pressure water. Moreover, since the sand is injected into the sand lifting vibrator at different positions, the air supply amount and high-pressure water supply amount can be controlled individually, and the specific gravity of the conveyed material is lightened, so the jet water flow effect can be efficiently used. It has the advantage of being an energy-saving key that can perform efficient sand pumping.

[Brief explanation of drawings]

The drawings show an embodiment of the sand pump of the present invention, and FIG.
FIG. 2 is an explanatory diagram showing the second embodiment, FIG. 3 is an explanatory diagram showing the third embodiment, and FIGS. 4 to 6 are known examples.
FIG. 4 shows an air lift pump, FIG. 5 shows a jet pump, and FIG. 6 shows an air mixture jet pump. 1 is a sand lifting vibrator, 3 is an air supply pipe, 5 is a high pressure water supply pipe, 9 is an air supply chamber, 12 is a high pressure water supply chamber, 10 is an air nozzle,
13 is a high pressure water nozzle.

Claims (1)

[Claims] (1) The sand pump is equipped with a nozzle that spouts pressure water in the conveyance direction of the pipe-shaped waterway and a nozzle that spouts air, so that the pumping action of pressurized water and the pumping action of air are combined. A sand pump featuring: