JPH0818028B2 - Vacuum generator in vacuum type wastewater treatment system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum generator in a vacuum type waste water treatment system, and more particularly to a vacuum generator using an ejector.

[0002]

2. Description of the Related Art As a sewage treatment system, a vacuum sewage treatment system is used in which sewage is sucked and collected by a vacuum generated by a vacuum generator and sent to a sewage treatment device in a subsequent stage, where the sewage is purified. ing. FIG. 2 shows an example of this system, in which sewage discharged in each home or the like is mixed with air through a vacuum pipeline 102 by a vacuum generated by a vacuum generating device 100 in a gas-liquid mixed state to generate vacuum. Is sucked into the sewage tank 104 and separated into gas and liquid, and only sewage is sent to the sewage treatment apparatus in the subsequent stage. Here, as the vacuum generator 100, a sewage tank 104 and a machine room 108 are partitioned and formed in a housing 106 whose lower half is buried in the soil, and the sewage in the sewage tank 104 is ejected by an ejector 110. It is generally adopted that the liquid is circulated while being ejected from the nozzle, and a vacuum is generated by the jet flow from the nozzle.

[0003]

By the way, in the vacuum generator 100, it is necessary to separately form the sewage tank 104 and the machine room 108, which causes the housing 106 or the vacuum generator 100 itself. There was a problem that it had to be a large one.

Therefore, as a housing of such a vacuum generator, a cylinder for a manhole, which is widely used in a sewage system, is used, and the inside of the cylinder serves as a sewage tank, and an ejector is arranged and housed therein. It is considered. FIG. 3 (A) shows an example thereof. Here, a submersible pump type circulation pump 112 is used, and the submersible water 114 is immersed in the circulation pump 112 to pump up the wastewater 114 and the ejector. -116
Of the vacuum generation unit 1
The vacuum generated at 20 sucks the dirty water from the conduit 122.

However, in the case of such a vacuum generator, a manhole cylinder (hereinafter simply referred to as a manhole)
Is required to be at least the horizontal length of the ejector-116 plus the length of the jet flow, and a manhole having a large diameter is required. In addition, since the jet flow violently collides against the wall from the front, the reflected flow is violent, and the residence time of the jet flow in the gas phase is short, so that gas-liquid separation is sufficient in the gas phase. There is a problem that it is not done.

On the other hand, as shown in FIG. 3 (B), it may be considered that the jet flow from the ejector 124 is jetted vertically downward. In this case, it is possible to use a manhole having a small diameter as the housing 126 of the vacuum generator. However, in the case of this type, not only the gas-liquid separation is not performed well, but also the ejector 12 is used.
Since the jet flow from No. 4 rushes into the wastewater 114 with a strong force, a large amount of air is mixed into the wastewater 114, and the pumping capacity of the circulation pump 112 is greatly reduced or impossible.
In order to prevent this, a buffer plate 128 may be provided in the middle of the jet flow from the ejector 124 to stop the momentum. In this case, the buffer plate 12 is used.
Because the jet flow violently collides against 8,
The strength of the plate 128 becomes a problem, in addition to the buffer plate 12
There is a problem in that since the dirt adheres to No. 8, it is necessary to clean the dirt, and by providing such a buffer plate 128, the structure inside the tank becomes complicated and the maintenance of the circulation pump 112 becomes very difficult. .

[0007]

The present invention has been made to solve the above problems, and its gist is to temporarily collect collected sewage in a sewage tank and to collect the sewage in the sewage tank. In a vacuum generator which is circulated while being ejected from its ejection port by an ejector, and in which a vacuum is generated based on the ejection action of the ejector, the ejector is disposed in the waste water tank, and the ejector is disposed. The jet flow from-is jetted in a substantially horizontal direction along the annular peripheral wall surface in the wastewater tank.

[Operation and Effect of the Invention] As described above, according to the present invention, the ejector is arranged and housed in the waste water tank, whereby the machine room which has been conventionally required becomes unnecessary. Is made compact. Further, in the device of the present invention, the ejected flow from the ejector is ejected in a substantially horizontal direction along the annular peripheral wall surface, and while circling the peripheral wall surface, drops downward, and the sewage liquid stored in the lower part Gently flow into. Therefore, the sewage liquid in the lower portion is not disturbed by the jet flow, and a large amount of air is not mixed in the sewage liquid, so that the buffer plate as described above is unnecessary. Therefore, there are problems such as the strength of the buffer plate being installed, the dirt on the buffer plate making cleaning difficult, and the buffer plate making maintenance in the tank difficult. Does not happen.

In the apparatus of the present invention, the gas-liquid mixed flow ejected from the ejector circulates and flows into the lower sewage liquid for a long time while circulating. That is, the residence time in the gas phase is long, and therefore the gas-liquid separation is favorably performed in the gas phase. Further, the device of the present invention is characterized in that the jet flow from the ejector is guided along the annular peripheral wall surface,
There is an advantage that a cylindrical manhole used for general sewerage can be used as it is as a housing. That is, if such a cylindrical manhole is used, its inner wall surface can be used as it is as an annular peripheral wall surface for guiding the jet flow. When such a manhole is used, it can be completely buried in the soil, which allows the vacuum generator to be freely installed in any place. For example, in a vacuum type sewage treatment system, even if there is a case where it is desired to install a vacuum generation device in the middle of a road, it is difficult for a conventional device to do so, but the present invention makes it possible. Of. Further, if such a manhole can be diverted, the device cost can be kept low.

In addition, in the case of the device of the present invention, since the jet flow from the ejector is guided along the annular peripheral wall surface, when such a manhole is used, a device having a small diameter can be used. It is possible, which allows the device to be made more compact.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, 10 is a vacuum generator as an example of the present invention. Reference numeral 12 is a housing that directly uses a manhole that is often used in sewers, and the entire inside is configured as a sewage layer, and a submersible pump type circulation pump 16 and an ejector 14 are disposed in the sewage layer. Has been done. The ejector 14 pumps up the sewage pipe 18 for pumping the sewage liquid 15 stored in the sewage layer, the vacuum generation part 20, and the sewage sucked into the vacuum generation part 20 from the vacuum sewage pipe line 22. It has a jet tube 24 that discharges in a mixed state together with the dirty water that has been pumped through the pipe 18, and an outlet portion 26 in which the inner diameter gradually increases at the tip thereof. Thus, in this example, the portion from the upper end portion of the pumping pipe 18 to the outlet portion 26 extends substantially horizontally along the circular inner peripheral wall surface 28 of the housing 12 and is bent in a circular shape.

In such a vacuum generator 10,
The mixed liquid of the pumped sewage and the sewage sucked from the vacuum sewer pipe 22 is vigorously ejected from the outlet 26 in a gas-liquid mixed state. The jet flow is directed in a circular shape inside the ejector 14 in advance, is jetted from the outlet portion 26, and after jetting is circulated along the circular inner peripheral wall surface 28 of the housing 12. Then, while performing such patrol, it gradually flows downward, and the sewage liquid 15 at the bottom is discharged.
It gently flows into the inside.

In the apparatus of this example, the vacuum generator 10
The inside of the housing 12 of is configured as a sewage layer as a whole,
The ejector 14 is housed therein, and no machine room is provided. This makes the vacuum generator 10 compact.

Further, since the apparatus of this example uses a commercially available manhole which is often used for sewage and the like, the apparatus price is low. In addition, the jet flow from the ejector 14 circulates along the circular inner peripheral wall surface 28 of the housing 12 and then gently flows into the lower sewage liquid 15, so that the lower sewage liquid 15 is disturbed or the inside thereof is disturbed. There is no possibility that a large amount of air will be mixed in. Therefore, it is not necessary to provide a buffer plate as described above,
Therefore, there is no problem with the disposition of such a buffer plate. Further, the jet flow ejected from the ejector stays in the gas phase for a long time, so that gas-liquid separation is favorably performed. Also, unlike the vacuum generator shown in FIG. 3 (A) described above, a manhole having a small diameter can be used, which makes it possible to make the device structure more compact.

The above-mentioned device is merely an example of the present invention, and the present invention can be configured in various other forms. For example, in the above example, the housing is formed into a completely cylindrical shape, but in some cases it is also possible to form it into a polygonal shape, and the inner peripheral wall surface of the housing is used as it is as an annular peripheral wall surface for jet flow guidance. However, in some cases, an annular guide surface (peripheral wall surface) may be separately provided in the housing so that the jet flow from the ejector can be jetted along this guide surface. Furthermore, the guide surface does not necessarily have to be provided over the entire height between the ejector and the lower sewage liquid, and in some cases, over the range in which the jet flow makes one round,
Alternatively, the present invention can be configured in various modified forms based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of a vacuum generator which is an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional general vacuum type sewage treatment system.

FIG. 3 is a diagram showing an example of a possible vacuum generating device.

[Explanation of symbols]

 10 Vacuum Generator 12 Housing 14 Ejector 15 Sewage Liquid 28 Inner Wall Surface

Claims (1)

[Claims] 1. Collected sewage is temporarily stored in a sewage tank, and the sewage in the sewage tank is circulated while being ejected from its ejection port by an ejector so that a vacuum is generated based on the ejection action of the ejector. In the vacuum generator described above, the ejector is arranged in the waste water tank, and the jet flow from the ejector is ejected in a substantially horizontal direction along an annular peripheral wall surface in the waste water tank. A vacuum generator in a vacuum-type wastewater treatment system characterized by the above.