JPH0752237Y2 - Vacuum type sewer system - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention allows sewage containing floating foreign substances such as scum, rubber balls, plate materials, resin sheets, and resin films such as vinyl bags to flow into a water tank. The present invention relates to a vacuum sewer system configured to perform vacuum drainage when the water level in a water tank reaches or exceeds a set drainage water level.

[Prior Art] Conventionally, a lid 1A of a water storage tank (sewage mass) 1 shown in FIG.
A suction pipe 2 having a vertical axis attached to is inserted into a water tank 1, and this suction pipe 2 is connected to an inlet 4A of a vacuum valve 4 via an elbow 3 in the vicinity of the suction pipe 2 and in parallel therewith. A vacuum sewer system having a structure in which a water level detection pipe 5 to be inserted into a water storage tank 1 is attached to a lid 1A and an outlet 4B of a vacuum valve 4 is connected to a vacuum drainage system 6 is already known.

In this type of vacuum sewer system, multiple sewer inflow pipes 7,7
Sewage (dirty water) flows from the water tank 1 into the water tank 1, and the water level in the water tank 1 rises above the level WL1 for sealing the tip of the water level detecting tube 5 to rise according to the height. The water level is detected by the pressure of the air trapped inside, and the vacuum valve 4 is automatically opened by the pipe internal pressure when the water level reaches the set drain water level WL2, and the negative pressure of the vacuum drainage system 6 is transferred to the suction pipe 2. The sewage remaining in the water storage tank 1 is sucked and discharged by being operated.

[Problems to be Solved by the Invention] However, the water level detection pipe 5 employed in the conventional vacuum sewer system has a structure in which the annular front end surface 5A is horizontally formed.

Therefore, when the water level of the water tank 1 is at WL3 lower than WL1, it is made of a material having a smaller specific gravity than water among various foreign substances contained in the sewage, such as balls, plates,
When a floating foreign matter such as a resin sheet or resin film flows into the water tank 1, the water level rises above WL1.
As shown in FIGS. 10 and 11, the floating foreign matter 8 may block the annular tip surface 5A of the water level detection pipe 5.

In this way, when the floating tip 8A of the water level detection pipe 5 is blocked by the floating foreign matter 8, the water level in the water storage tank 1 becomes the drain water level WL2.
However, since the air pressure in the water level detection pipe 5 does not rise, the water level is not detected and the vacuum valve 4 is not opened. Therefore, the drainage from the water storage tank 1 is disturbed and overflows. Will be invited.

The present invention has been made in view of the above circumstances, and prevents the annular tip surface of the water level detection pipe from being blocked by floating foreign matter flowing into the water storage tank, and when the water level reaches the drainage water level. It is an object of the present invention to provide a vacuum sewer system capable of reliably exhibiting a predetermined drainage function by reliably detecting the above.

[Means for Solving the Problems] In order to achieve the above object, a vacuum sewer system according to the present invention is provided with a water tank into which sewage flows, and a water level set in the water tank by being inserted into the water tank. When the drainage level is reached,
The water level detection pipe for detecting the water level by the pressure in the pipe, the sewage suction pipe inserted into the water storage tank under the negative pressure of the vacuum drainage system, and the water level detection pipe interposed in the vacuum drainage system. In a vacuum type sewer system equipped with a vacuum valve that is automatically opened in response to detecting the set drainage water level, in at least a part of the annular tip surface of the water level detection pipe from a horizontal reference line at the tip. A displacement portion that displaces in at least one of the vertical direction is formed.

[Operation] According to the present invention, even if floating foreign matter such as a slam or a rubber ball that has flowed into the water tank is positioned corresponding to the annular tip surface of the water level detection pipe, the inside of the water level detection pipe is It is possible to hold the tank in communication with the water storage tank through a displacement portion that is displaced in at least one of the vertical direction from the horizontal reference line. Therefore, when the water level in the water storage tank reaches the drainage water level, the water level is detected with the rise of the air pressure in the water level detection pipe, the vacuum valve is automatically opened, and the predetermined vacuum drainage function is reliably achieved. It will be.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the suction pipe and the water level detection pipe, and FIG. 2 is a side view of the same. It should be noted that the same or corresponding parts as those of the conventional example described in FIGS.

In FIG. 1 and FIG. 2, the annular tip surfaces 2A, 5A of the suction pipe 2 and the water level detection pipe 5 inserted in the water storage tank 1 are upwardly angled from the horizontal reference line A at two positions facing each other. Displacement portions 9 and 9 which are displaced are formed.

The operation of the vacuum sewer system shown in FIG. 9 provided with the suction pipe 2 and the water level detection pipe 5 configured as described above will be described.

When the water level of water tank 1 is at WL3 lower than WL1, it is made of a material with a smaller specific gravity than water together with sewage, for example, floating foreign matter 8 such as balls, plates, resin sheets or resin films flows into water tank 1. However, when the water level rises above WL1, the floating foreign matter 8 in which buoyancy is generated, as shown by the phantom lines X and Y in FIGS. 1 and 2, has an annular tip of the suction pipe 2 or the water level detection pipe 5. Even if it corresponds to the surfaces 2A and 5A, the insides of the suction pipe 2 and the water level detection pipe 5 are displaced from the horizontal reference line A at the tip end in a mountain shape by displacing portions 9 and 9 upward to form a water tank 1.
Will be connected to.

Therefore, even if the water level reaches the drainage water level WL2 while the floating foreign matter 8 remains corresponding to the annular tip surface 2A of the suction pipe 2, this state can be detected by the water level detection pipe 5, and at that time point. To automatically open the vacuum valve 4,
Sewage can be sucked in by the suction pipe 2, that is, drainage of the water storage tank 1 can be appropriately performed. Therefore, it is possible to reliably avoid the disadvantage that the water storage tank 1 overflows.

Even if the floating foreign matter 8 corresponds to the annular tip surface 5A of the water level detection pipe 5, the pressure of the air trapped in the water level detection pipe 5 is increased according to the rise of the water level, and the drainage water level WL2 can be detected. Therefore, the vacuum valve 4 is automatically opened by the pressure in the pipe at this time, and the negative pressure of the vacuum drainage system 6 is caused to act on the suction pipe 2 so that the sewage remaining in the water tank 1 can be appropriately sucked and discharged. Therefore, it is possible to reliably avoid the occurrence of the inconvenience that the water tank 1 overflows.

Further, even if the floating foreign matter 8 is attracted to the annular front end surface 2A of the suction pipe 2 during the drainage and responds, an improper operation such as interruption of drainage can be avoided.

As described above, when the floating foreign matter 8 corresponds to the annular tip surface 2A of the suction pipe 2, the suction flow rate decreases, but when the water level decreases to a predetermined level with the passage of time and the vacuum valve 4 is closed, The water in the suction pipe 2 falls and the floating foreign matter 8 is removed from the annular tip surface 2A by the force of the water to secure a predetermined suction flow rate. There is no gradual rise in water and flooding.

In the above-mentioned embodiment, the tip portion structure formed by displacing the displacement portions 9 and 9 upward from the horizontal reference line A is described.
The present invention is not limited to the above embodiment,
The displacing portion 9 may be formed by displacing downwardly from the horizontal reference line A as shown in FIG. 3, in a sawtooth shape as shown in FIG. 4, as a dog clutch shape as shown in FIG. It may be formed in a staircase shape.

Further, about half of the annular tip surface 2A as shown in FIG. 6 is horizontally formed on the horizontal reference line A, and is displaced obliquely upward from here to form the displacement portion 9, which is shown in FIG. As described above, a tip structure in which the displacement portion 9 is formed by obliquely displacing downward from the horizontal portion formed on the horizontal reference line A and further horizontally displacing from the horizontal portion may be used. Of course, it may be a tip structure to which other variously deformed displacement parts 9 are applied.

In particular, as shown in FIG. 8, the tip structure in which the displacement portion 9 is formed by obliquely displacing the annular tip surface 2A upward from the horizontal reference line A is the easiest to manufacture.

With such a tip structure, even if the floating foreign matter 8 corresponds to the annular tip surface 2A of the suction pipe 2 or the annular tip surface 5A of the water level detection pipe 5, the floating foreign matter 8 responds to the rising water level.
Floats along the inclined surface due to its buoyancy, and the annular tip surface 5A
Will be released naturally.

In the above embodiment, the displacement part 9 is formed on both the water level detection pipe 5 and the annular tip surfaces 5A, 2A of the suction pipe 2 in the vacuum sewer system, so that both pipes 5, 8
Although the description has been given of the case where the tip end surface of No. 2 is prevented from being blocked and proper and reliable water level detection and sewage suction can be performed, the present invention has the displacement part 9 only on the annular tip end surface 5A of the water level detection pipe 5. May be formed.

[Effects of the Invention] As described above, according to the present invention, even if a floating foreign matter such as a slam or a rubber ball that has flowed into the water tank is positioned corresponding to the annular tip surface of the water level detection pipe, the water level detection is performed. It is possible to prevent the detection tube from being blocked by keeping the inside of the tube in communication with the water tank via the displacement portion that is displaced in at least one of the vertical direction from the horizontal reference line at the tip of the tube. Therefore, when the water level in the water tank reaches the drainage level, the water level can be detected properly and reliably according to the increase in the air pressure in the water level detection pipe, which automatically opens the vacuum valve to perform the predetermined vacuum drainage function. It can be surely exerted, and it is possible to avoid the inconvenience of overflowing due to hindrance of drainage from the water storage tank.

[Brief description of drawings]

FIG. 1 is an enlarged front view of a main part of a vacuum type sewer system according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIGS. 3 to 8 are other embodiments of the present invention. FIG. 9 is an enlarged side view of the essential part shown in FIG. 9, FIG. 9 is an overall configuration diagram of the vacuum sewer system, and FIGS. 10 and 11 are enlarged front views of the essential parts of the conventional vacuum sewer system. 1 ... Water tank 2 ... Suction pipe 2A ... Annular tip surface of suction tube 5 ... Water level detection tube 5A ... Annular tip surface of water level detection tube 9 ... Displacement part A ... Horizontal reference line

Claims (1)

[Scope of utility model registration request] 1. A water tank into which sewage flows, and a water level detection pipe which is inserted into this water tank and detects the water level by the pressure inside the water tank when the water level in the water tank reaches a set drainage water level.
Automatically in response to the sewage suction pipe inserted in the water storage tank under the negative pressure of the vacuum drainage system and the water level detection pipe interposed in the vacuum drainage system detecting the set drainage water level. In a vacuum type sewer system including a vacuum valve that is opened dynamically, at least a part of an annular tip surface of the water level detection pipe is provided with a displacement portion that is displaced from a horizontal reference line of the tip in at least one of the vertical direction. The vacuum sewer system is characterized by