JP3118161B2 - Soundproof and vibration-proof negative pressure forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative pressure forming device which is a driving source at the time of, for example, dredging, dewatering / filtration, etc.

[0002]

2. Description of the Related Art For example, a vacuum device such as a plunger pump is used as a negative pressure generating device used as a drive source in operations such as dredging, dehydration and filtration, and a negative pressure generated by the plunger pump is stored in a reservoir. It is stored in a tank to eliminate pulsation and stably supply a negative pressure, and solids, gases and liquids contained in the sucked fluid are separated by a reservoir tank.

[0003] When the dredged sludge is fed,
Generally, a compressed fluid generated by a blowing device such as a blower is used, and powder or the like is flowed by the fluid generated by the blower.

[0004]

However, the principle of forming a negative pressure or forming a pressurized fluid in equipment such as a plunger pump for supplying a negative pressure to the working device and a blower as described above is based on volume change. For example, when this volume changes, large vibrations and noises are generated from the plunger pump and the blower and the like, and the large vibrations and noises generated from the plunger pump and the blower and the like are related. There is a problem that the heat is dissipated to the surroundings together with the vibration and noise of the pump driving the pump, and this causes a decrease in the working environment and the surrounding environment. Also, different operations such as dredging and dewatering / filtration are performed simultaneously in parallel.However, as in the past, the negative pressure generated by a vacuum pump such as a plunger pump is stored in a reservoir tank, and dredging is performed from this reservoir tank. It is conceivable to supply a negative pressure to each operation such as dehydration and filtration, but in such a case, the negative pressure in the reservoir tank becomes the weakest negative pressure among the branched and used negative pressures. For this reason, there is a problem that it is not suitable for work requiring a strong negative pressure.

[0005]

In order to achieve the above object, a soundproof and vibration-proof negative pressure forming apparatus according to the present invention first comprises a sealable liquid storage container storing a pressurizing liquid, and a liquid storage container. A submerged pump provided with at least a suction port buried in the pressurized liquid, and a liquid pressurized by the submerged pump is ejected to a negative pressure forming pipe to form a negative pressure in the negative pressure forming pipe. A plurality of jet pumps, the liquid pressurized by the submerged pump is branched and supplied to the plurality of jet pumps, and the discharge ports of the negative pressure forming pipes of the plurality of jet pumps are provided. In the liquid for pressurization of the liquid storage container
To, or in liquid pressurized in the discharge vessel which communicates with the liquid storage vessel in communication with the liquid level of a pressure fluid, it is characterized in that is opened.

Next, a jet pump for forming a negative pressure jets a high-pressure liquid pressurized in water into the mixing pipe to form a negative pressure in the mixing pipe, and the gas sucked from the intake port by the negative pressure. It is also one of the features that the mixture jet flow is formed in the negative pressure forming pipe to form a negative pressure in the negative pressure forming pipe.

[0007]

In the sound-proof and vibration-proof negative pressure forming apparatus according to the present invention, first, the submerged pump installed in the water storage tank is driven to pressurize the water in the water storage tank, and the jet pump provided for each work is pressurized. Supply to the injection nozzle. At this time, the vibration and noise at the time of driving the submerged pump are absorbed by the water stored in the water storage tank, and the generation of vibration and noise is also suppressed. In addition, noise generated from the submerged pump in a portion exposed from the water in the water storage tank is confined in the water storage tank.

Next, a high-pressure jet stream is injected from the injection nozzle, a negative pressure is formed in the protection tube or the negative pressure forming tube, and when a negative pressure is formed in the protection tube, the outside air is sucked by the negative pressure. After the mixture jet flow is formed in the protective tube and injected to form a negative pressure in the negative pressure forming tube, the jet flow and the mixture jet flow are discharged from the discharge port of the negative pressure forming jet pump into the water storage tank. It is refluxed and used repeatedly. The impact when the jet stream and the mixed jet stream are discharged from the discharge port of the negative pressure forming jet pump into the water storage tank is received by the water in the water storage tank and is buffered. Noise is also absorbed by the water in the reservoir.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. <Example 1> Fig. 1 is a schematic diagram of a sludge treatment system provided with a negative pressure supply device for supplying a negative pressure for supplying a dredged sludge to a dehydrator and a negative pressure for supplying a negative pressure for a dehydration operation. In the figure, reference numeral 1 indicates the sludge treatment system as a whole. The sludge treatment system 1 includes a sludge tank 2 for storing dredged sludge, a vacuum dehydrator 3 for dewatering the sludge in the sludge tank 2, and a vacuum tank 4 for supplying sludge to the vacuum dehydrator 3.
And a filter 5 for filtering the dehydrated liquid, and a soundproof and vibration-proof negative pressure forming device 6 for supplying a negative pressure to the vacuum dehydrator 3 and the vacuum tank 4.

The vacuum tank 4 has a substantially cylindrical closed tank body 7, and an upper end of the closed tank body 7 is connected to an inlet 9 to which a suction hose 8 is connected and a negative pressure forming device described later. A negative pressure supply port 11 to which a supply hose 10 is connected is formed, and a bottom portion 7a of the closed tank main body 7 is formed in a tapered shape of a downward constriction, and a sludge supply port provided with an open / close valve 12 at a lower end thereof. 13 is opened above the sludge storage part 14 of the vacuum dehydrator 3.

A vacuum dehydrator 3 installed below the vacuum tank 4 has a cylindrical filter drum 15 which is rotatably driven by a driving device (not shown), and a suction port 16 inside the filter drum 15. A suction pipe 16 opening toward the bottom of the inner peripheral surface of the filtration drum 15 and a sludge supply port 13 of the vacuum tank 4
And the above-mentioned sludge storage section 14 provided at the upper quarter of the filtration surface 17 of the filtration drum 15 immediately below the sludge storage section 14.
The lower end portion 14a of the is designed to function as a scraping plate for scraping off dewatered sludge.

As shown in FIGS. 1 to 3, the soundproof and vibration-proof negative pressure forming apparatus 6 for supplying a negative pressure to the negative pressure supply port 11 of the vacuum tank 4 and the suction pipe 16 of the filtration drum 15, respectively. A submersible pump 20 is mostly immersed in water inside a sealable vertical cylindrical water storage tank (liquid storage container) 19 storing water 18 containing sewage, which will be described later. Install in a state where it extends to

The distal end of a water discharge pipe 21 of a submersible pump (submerged pump) 20 extending above the water storage tank 19 branches into two branches, and one of the branched and drawn pressure water supply pipes 22 (in the figure). A jet pump MJP for supplying a negative pressure to the vacuum tank 4 is provided at the end of the left side (left side), and a negative pressure is applied to the filtration drum 15 at the other end of the pressure water supply pipe 22 (right side in the figure). Air-mixing jet pump MJP for supplying pressure is provided. In the vicinity of the upper end of the water storage tank 19, a water supply port 23 for supplying the water 18 in the water storage tank 19 to the filter 5 is provided.

A jet pump MJP for supplying a negative pressure to the vacuum tank 11 is controlled by a pressure water supply pipe 22 branched from the tip of a water discharge pipe 21 and a flow control valve 24 provided on the pressure water supply pipe 22. A jet nozzle 25 for jetting the measured pressure water, a negative pressure forming pipe 26 installed downstream of the jet stream jetted from the jet nozzle 25, and supporting the negative pressure forming pipe 26, And a negative pressure suction port 29 opened between the injection nozzle 25 and the negative pressure forming pipe 26. The discharge port 26a of the negative pressure forming pipe 26 The storage tank 19 is opened in the water 18 stored in the buffer tube 28 communicating with the communication tube 27 through the communication tube 27.

Thus, the circulation path R for circulating and using the water in the water storage tank 19 by the submersible pump 20, the pressure water supply pipe 22, the injection nozzle 25, the negative pressure forming pipe 28, the buffer pipe 28, and the communication pipe 27 is reversed. It is formed in a U-shape. In addition, the negative pressure suction port 2 opened between the injection nozzle 25 and the negative pressure forming pipe 26.
9 is located above the liquid level L of the water 18 in the water storage tank 19.

An air-mixing jet pump MJP for supplying a negative pressure to the suction pipe 16 of the filtration drum 15 has a pressure water supply pipe 32 branching out from the distal end of the water discharge pipe 21 in substantially the same manner as the jet pump MJP. The pressure water metered by the flow control valve 34 provided in the pressure water supply pipe 32 is supplied to the protection pipe 36.
Nozzle 35 for injecting air into the nozzle, and a negative pressure forming pipe 37 installed downstream of the mixture jet stream injected from the protection pipe 36
A buffer tank (discharge container) 39 supporting the negative pressure forming pipe 37 and communicating with the water storage tank 19 through a communication pipe 38;
6 and a negative pressure suction port 40 opened between the negative pressure forming pipe 37.

The protection tube 36 sucks the outside air from the intake port 30 with the negative pressure generated by the jet flow from the injection nozzle 35 to convert the jet flow in the protection tube 36 into a mixed jet flow. A discharge port 37a of the negative pressure forming pipe 37 that discharges the mixed jet jet injected from the pipe 36 to the negative pressure forming pipe 37 has a discharge port 37a in the water 18 stored in the buffer pipe 28 connected to the water reservoir 19 by the communication pipe 38. It has an opening.

Then, the submersible pump 20 and the injection nozzle 35
Negative pressure forming pipe 37 A circulation path R for circulating and using water in the water storage tank 19 with the buffer tank 39 and the communication pipe 38 is formed in an inverted U-shape, and the protection pipe 36 and the negative pressure forming pipe 37 The negative pressure suction port 40 opened during the period is located above the liquid level L of the water 18 in the water storage tank 19.

The filter 5 installed on the side of the water storage tank 19 is formed of a vertically long cylindrical body having a sewage inlet 41 formed above, and a filter medium layer 42 filled with a filter medium is formed in a lower part. A discharge port 44 with a cock is provided below the filter medium layer 42 to discharge the filtered treated water to the side groove 43 and the like (see FIG. 1).

The reference numeral 45 in the figure denotes water 18 in the water storage tank 19.
A drain port provided at the bottom for draining water, reference numeral 46 denotes an air vent, reference numeral 47 denotes a drain port of the buffer tank 39, and 48.4.
Reference numeral 9 denotes a buffer sleeve provided in the buffer tube 28 and the buffer tank 39, respectively.

The operation of the soundproofing and vibration-proof negative pressure forming apparatus 6 according to the present invention through the sludge treatment system 1 configured as described above will be described below. First, the water in the water storage tank 19 is pressurized by operating the submersible pump 20, and a negative pressure is applied to the vacuum tank 4 from the tip of the water discharge pipe 21 through the pressure water supply pipes 22 and 32 and the respective flow control valves 24 and 34. Pump MJP for supplying air and air-jet pump for supplying negative pressure to the filtration drum 15
The pressure is supplied to each of the injection nozzles 25 and 35 of the MJP.

At this time, the vibration and noise generated when the submersible pump 20 is driven are absorbed by the water 18 stored in the water storage tank 19, and the generation of vibration and noise is suppressed. Vibration and noise transmitted through the water discharge pipe 21 exposed from the water 18 in the water storage tank 19 are contained in the space 19 a above the water storage tank 19 or received by the part 19 b supported on the upper wall of the water storage tank 19. This prevents leakage and emission to the outside.

When the pressure water supplied to the injection nozzle 25 of the jet pump MJP for supplying a negative pressure to the vacuum tank 4 is injected into the negative pressure forming pipe 26 as a jet stream, the injection nozzle of the negative pressure forming pipe 26 Negative pressure due to cavitation is formed in a portion closer to 25. When this negative pressure is supplied from the negative pressure suction port 16 to the vacuum tank 4, the inside of the closed tank body 7 is set to a negative pressure, and the sludge in the sludge tank 2 is sucked. From 13, it is supplied to the sludge storage section 14 of the vacuum dehydrator 3.

The discharge port 2 at the lower end of the negative pressure forming tube 26
The jet flow discharged from 6a is recirculated from the buffer pipe 28 into the water storage tank 19, and is pressurized again by the submersible pump 20 for use. At this time, the impact when the jet stream is discharged from the discharge port 26a of the negative pressure forming pipe 26 into the water storage tank 19 is caused by the water 18 in the water storage tank 19 and the buffer sleeve 48.
The vibration and noise generated at that time are absorbed by the water 18 in the water storage tank 19.

Next, when pressurized water is supplied by pressure to the injection nozzle 35 of the air-mixing jet pump MJP for supplying a negative pressure to the filtration drum 15 and is injected into the protection tube 36, as shown in FIG. Creates a negative pressure due to the jet flow,
With this negative pressure, outside air is sucked from the intake port 30 and the protection tube 3
After converting the jet stream in 6 into a mixed jet stream, the protective tube 3
6 is injected into the negative pressure forming pipe 37.

When the mixture jet stream is injected into the negative pressure forming pipe 37 and spreads completely in the negative pressure forming pipe 37, a negative pressure is generated by the cavity. This is due to the fact that the air-jet stream that has spread completely inside the pipe 37 acts like a piston P that acts continuously inside the negative pressure forming pipe 37 toward the opening at the lower end.

At this time, the air bubbles mixed in the mixed jet flowing in the negative pressure forming pipe 37 act as a cushion to reduce the frictional resistance between the inner surface 37a of the negative pressure forming pipe 37 and the jet water flow. A strong negative pressure can be formed by preventing the flow of the mixture jet from attenuating rapidly. The discharge port 37 at the lower end of the negative pressure forming pipe 37
The jet stream discharged from a is returned from the buffer pipe 39 through the communication pipe 38 into the water storage tank 19, and is used again as the water 18 pressurized by the submersible pump 20.

At this time, the impact when the jet stream is discharged from the discharge port 37a of the negative pressure forming pipe 37 into the buffer pipe 39 is received by the water 18 in the buffer pipe 39 and the buffer sleeve 49 and is buffered. The vibration and noise generated at that time are also absorbed by the water 18 in the water storage tank 19.

When a strong negative pressure is formed in the negative pressure forming pipe 37, the negative pressure is used to rotate the vacuum dehydrator 3 driven by a driving device.
The sludge supplied from the suction pipe 16 to the filtration drum 15 and stored in the sludge storage unit 14 is supplied to the filtration surface 17 of the filtration drum 15.
After being dehydrated by being adsorbed on the lower end portion of the sludge storage portion 14,
In a, it is scraped off like a cake. Filtration drum 1
The sewage sucked from 5 is returned to the water storage tank 19 through the negative pressure suction port 40 through the negative pressure forming pipe 37 and the buffer tank 39, and is pressurized again by the submersible pump 20 for use.

The water level of the sludge and the like in the water storage tank 19 gradually rises due to the waste water sucked from the filtration drum 15 in this manner,
After passing through the water supply port 23 of the water storage tank 19, water 18 such as sludge in the water storage tank 19 is supplied to the filter 5 from the water supply port 23 by the pressure of the jet stream. The sludge supplied from above the filter 5 is filtered by a filter medium layer 42 provided at a lower portion thereof, and then discharged to a side groove 43.

When the operation of the work is stopped by stopping the submersible pump 20, the negative pressure which has been generated in each jet pump MJP disappears.
Since the negative pressure suction ports 29 and 40 formed on the upper side of the water tank 19 are located above the liquid level L of the water 18 in the water storage tank 19, the waste water sucked from the filtration drum 15 into the water storage tank 19 is removed. This prevents the water 18 from flowing back out of the negative pressure suction ports 29 and 40.

<Embodiment 2> In this embodiment, as shown in FIGS. 5 and 6, the air-mixing jet pump MJP for supplying a negative pressure to the filtration drum 15 in the above-described embodiment is supplied with a negative pressure to a vacuum tank. The jet pump MJP has a structure similar to that of the jet pump MJP. The discharge port 37a of the negative pressure forming pipe 37 of the jet pump MJP for supplying a negative pressure to the filtration drum 15 is opened in the buffer sleeve 49 in the water 18 in the water storage tank 19. This embodiment is different from the first embodiment in the point that it is performed.

In each of the above embodiments, there are two jet pumps: one is a mixed air jet pump for supplying negative pressure to the filtration drum with the pressurized water pressurized by one submersible pump, and the other is a jet pump for supplying negative pressure to the vacuum tank. Although the case of branch supply to the place has been described as an example, the number of branches is not limited to two, and it is possible to supply to a jet pump that branches into three or more and forms a separate working negative pressure, It is a matter of course that one soundproof and vibration-proof negative pressure forming device of the present invention may be provided for one operation.

Further, in each of the above embodiments, the water 18 is stored in the water storage tank 19, and the Suzutsunaka pump is buried in the water 18. However, the water in the water storage tank 19 is not limited to water. Of course, a liquid can be stored and this liquid can be used as a pressurizing fluid.

[0035]

As described above, the sound-proof and vibration-proof negative pressure forming apparatus of the present invention injects water in a water storage tank pressurized by a submerged pump in the water storage tank from an injection nozzle to produce a negative pressure. Negative pressure is created in the formation pipe.Vibration and noise when the submerged pump is driven are absorbed by the water stored in the water storage tank, and the generation of vibration and noise is suppressed. The noise generated by the submersible pump in the portion exposed from the water inside is also contained in the water storage tank. This has the advantage that noise and vibration generated when the submersible pump is driven can be prevented from radiating to the surroundings, and the environment can be prevented from lowering due to vibration and noise.

Further, the jet stream flowing through the negative pressure forming pipe in which a negative pressure is formed in the protective tube or the negative pressure forming pipe is returned from the discharge port into the water storage tank and used repeatedly.
At this time, the impact when the jet stream and the mixed jet stream are discharged from the discharge port of the negative pressure forming jet pump into the water tank is received and buffered by the water in the water tank, and the vibration generated at that time is reduced. Since the noise is also absorbed by the water in the water storage tank, the noise and vibration generated when the submerged pump is driven can be prevented, and the noise and vibration can be reduced. There is an advantage that the environment can be reliably prevented from lowering due to vibration and noise.

Incidentally, the sound-proof and vibration-proof negative pressure forming apparatus of the present invention injects water in a water storage tank pressurized by a submerged pump in the water storage tank from an injection nozzle to continuously apply a negative pressure to a negative pressure forming pipe. It is made to make negative pressure without depending on the volume change like the conventional plunger pump, blower and other equipment. As a result, the noise level could be reduced to about 1/3.

Further, a jet pump injects pressurized water from the injection nozzle into the protection tube to form a negative pressure in the protection tube, and forms a mixed jet stream with the outside air sucked by the negative pressure. In the case where the jet stream is injected into the negative pressure forming pipe to form a negative pressure, the air bubbles mixed into the mixed jet stream have a cushioning effect to reduce the frictional resistance between the inner surface of the negative pressure forming pipe and the jet stream. However, there is also an advantage that a strong negative pressure can be formed while preventing the flow of the mixed jet stream from rapidly attenuating and maintaining quietness.

Also, when different operations such as dredging, dewatering and filtration are performed simultaneously in parallel, each of the jet pumps attached to each operation can be driven with less vibration and noise, and the set different negative pressures Can also be generated.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a sludge treatment system using a sound-proof and vibration-proof negative pressure forming apparatus according to a first embodiment.

FIG. 2 is a longitudinal sectional view of the soundproofing and vibration-proof negative pressure forming device according to the first embodiment.

FIG. 3 is a plan view of the sound-proof and vibration-proof negative pressure forming apparatus according to the first embodiment.

FIG. 4 is a vertical sectional side view of an air-mixing jet pump MJP of the soundproofing and vibration-proof negative pressure forming device according to the first embodiment.

FIG. 5 is a vertical cross-sectional view of a soundproof and vibration-proof negative pressure forming apparatus according to a second embodiment.

FIG. 6 is a plan view of a sound-proof and vibration-proof negative pressure forming apparatus according to a second embodiment.

[Explanation of symbols]

6 ... Sound-proof and vibration-proof negative pressure forming device 18 ... Pressurizing liquid (water) 19 ... Liquid storage container (water tank) 20 ... Submersible pump (submersible pump) 26/37 ... Negative pressure forming pipe 28 ・ ・ ・ Buffer pipe (discharge vessel) 35 ・ ・ ・ Injection nozzle 36 ・ ・ ・ Protective pipe (mixed air pipe) 39 ・ ・ ・ Buffer tank (discharge vessel) MJP ・ ・ ・ Jet pump

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04F 5/04

Claims (2)

(57) [Claims] 1. A liquid storage container capable of storing a pressurizing liquid, a sealable liquid storage container, a submerged pump provided with at least a suction port embedded in the pressurized liquid of the liquid storage container, and a submerged pump. A plurality of jet pumps for injecting the pressurized liquid into the negative pressure forming pipe to form a negative pressure in the negative pressure forming pipe, and branching the liquid pressurized by the submerged pump to form a plurality of jets. supplies configured to be able to pump, the discharge port of the negative pressure generating tube of the plurality of jet pump pressurizing the liquid in the liquid reservoir container, or pressurizing the liquid reservoir container which communicates with the liquid surface of a liquid in the liquid discharge vessel communicating, soundproof antivibration type vacuum forming apparatus characterized in that is opened. 2. A jet pump for forming a negative pressure injects a high-pressure liquid pressurized in water into a mixing pipe to form a negative pressure in the mixing pipe, and a gas sucked from an intake port by the negative pressure. 2. The soundproofing and soundproofing device according to claim 1, wherein the mixture jet pump is configured to form a mixture jet stream, and to jet the mixture jet stream into a negative pressure forming pipe to form a negative pressure in the negative pressure forming pipe. Shaking negative pressure forming device.