JPH08218473A - Air intake structure in vacuum type sewage collection system - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the vacuum valve is opened, it reduces the negative pressure inside the vacuum valve mass regardless of the installation distance of the air intake pipe, so that the wastewater inflow pipe and the wastewater generation source Ensures that high negative pressure is not transmitted to the trap. [Structure] A sewage sump 7 is formed in an invert 3A of a vacuum valve mass 3 in which a vacuum valve 4 is arranged, and sewage generated by a sewage generation source 9 is caused to flow down to the sewage sump 7 by a sewage inflow pipe 10. In the vacuum type sewage collection system provided with an air intake pipe 13 that introduces the atmosphere into the vacuum valve mass 3, the outlet of the air intake pipe 13 is configured so that the waste water in the waste water reservoir 7 is sucked by opening the valve. 13B is provided in the waste water reservoir 7 near the lower end opening 6A of the suction pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake structure in a vacuum type sewage collection system, and more specifically, it has a function of preventing a high negative pressure generated in a vacuum valve mass from propagating to a wastewater inflow pipe. Air intake structure.

[0002]

2. Description of the Related Art As a conventional vacuum type sewage collection system of this type, the applicant of the present invention has proposed the prior art described in Japanese Utility Model Publication No. 6-14287. As shown in FIG. 2, this vacuum type sewage collection system includes a sewage collection site 2 equipped with a vacuum pump 1 and a vacuum valve 4 arranged in a vacuum valve mass 3.
4A and the outlet 4A of the vacuum valve 4 are communicated with each other through the vacuum sewer pipe 5, and the inlet 4B of the vacuum valve 4 is communicated by the suction pipe 6 with the waste water reservoir 7 recessed in the bottom portion (invert) 3A of the vacuum valve mass 3. At the same time, the air that is configured to cause the wastewater generated at the wastewater source 9 such as the sink of the private house 8, the toilet, and the sanitary equipment to flow down to the wastewater reservoir 7 by the wastewater inflow pipe 10 and introduce the atmosphere into the vacuum valve mass 3 The structure is such that an intake pipe 13 is provided.

In the vacuum type sewage collection system configured as described above, sewage (domestic drainage or sewage) generated at the sewage source 9 of the private house 8 is discharged to the sewage reservoir 7 through the sewage inflow pipe 10. . When the water level in the dirty water reservoir 7 rises to the vacuum valve operating water level HWL, the air pressure in the water level detection pipe 11 rises. This increase in air pressure is applied to the vacuum valve control means 12 to open the vacuum valve 4. As a result, the sewage in the sewage reservoir 7 is sucked into the vacuum sewer pipe 5 through the path from the suction pipe 6 to the open vacuum valve 4. As a result, the level of sewage in the sewage sump 7 drops to a level lower than the lower end opening 11A of the water level detection pipe 11, and when the lower end opening 11A is exposed,
The pressure in the water level detection pipe 11 is lowered, the pressure drop is transmitted to the vacuum valve control means 12 and the water level is further lowered while the vacuum valve 4 is closed, and the lower end opening 6A of the suction pipe 6 is exposed. The valve is closed after air is taken in for a certain period of time. In the vacuum type sewage collection system, in order to effectively convey the sewage in the vacuum sewage pipe 5, it is necessary to suck a certain amount of air after suctioning the sewage.

By the way, as described above, when the lower end opening 6A of the suction pipe 6 is exposed and the air in the vacuum valve mass 3 is sucked, the inside of the vacuum valve mass 3 becomes negative pressure. In this case, if the air intake structure is such that the laying distance of the air intake pipe 13 is shortened and the inlet 13A is set near the vacuum valve mass 3, the air intake pipe 13 introduces the atmosphere into the vacuum valve mass. The negative pressure of 3 can be kept small. However, in the air intake structure in which the laying distance of the air intake pipe 13 becomes long due to road conditions, etc., and the inlet 13A is set far away from the vacuum valve mass 3, the air into the vacuum valve mass 3 is The amount taken in is small, and the effect of suppressing negative pressure in the vacuum valve mass 3 is small. Therefore, a high negative pressure in the vacuum valve mass 3 is transmitted to the trap of the sewage source 9 of the private house 8 through the sewage inflow pipe 10 to suck the accumulated water in the trap to lower the water level or to trap the trap. There is a possibility that it may have an adverse effect such as damage.

[0005]

The problem to be solved by the present invention is that in the conventional air intake structure in the vacuum type sewage collection system, when the installation distance of the air intake pipe becomes long, the vacuum valve is opened to open the vacuum valve. When the negative pressure in the mass becomes high, this high negative pressure is transmitted to the trap of the wastewater generation source of the private house through the wastewater inflow pipe, sucking the trapped water in the trap and lowering the water level, or This is a point that there is a risk of adverse effects such as damage.

[0006]

According to the present invention, a sewage collection field equipped with a vacuum pump and an outlet of a vacuum valve arranged in a vacuum valve mass are communicated with each other by a vacuum sewer pipe, and the inlet of the vacuum valve is sucked. A pipe is connected to the wastewater reservoir formed at the bottom of the vacuum valve mass, and the wastewater generated at the wastewater source is configured to flow down to the wastewater reservoir in the vacuum valve mass by the wastewater inlet pipe. In a vacuum type sewage collection system provided with an air intake pipe for introducing air into the mass, the outlet of the air intake pipe is provided in the waste water reservoir near the inlet of the suction pipe, and a vacuum is provided. Even if the valve is opened, it alleviates the negative pressure inside the vacuum valve mass regardless of the installation distance of the air intake pipe, and a high negative pressure propagates to the traps such as the sewage inflow pipe and sewage generation source. To prevent being To achieve the target.

[0007]

According to the present invention, when the water level in the waste water pool rises to a predetermined water level, the air pressure in the water level detection pipe rises, and this rise in air pressure is applied to the vacuum valve control means to open the vacuum valve. As a result, the sewage in the sewage reservoir is sucked into the vacuum sewer pipe through the path from the suction pipe to the open vacuum valve. As a result, when the level of sewage in the sewage pool is lowered to a level lower than the inlet of the suction pipe, and when the inlet is exposed to suck air, the outlet of the air intake pipe is also opened, Air is easily supplied from the air intake pipe to the suction pipe.
As a result, most of the amount of air sucked into the suction pipe is covered by the air supplied from the air suction pipe, and the amount of air sucked into the suction pipe from the inside of the vacuum valve mass is suppressed to a low level. It is possible to relieve the negative pressure in the valve mass. On the other hand, when the level of sewage in the sewage pool drops to near the inlet of the suction pipe, the lower end opening of the water level detection pipe is also opened,
The pressure in the water level detection pipe is reduced, and the pressure is transmitted to the vacuum valve control means to close the vacuum valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the invention of claim 1 will be described below with reference to the drawings. The same or corresponding parts as those of the conventional example described in FIG. 2 are designated by the same reference numerals, and detailed description of the structure and operation will be omitted. FIG. 1 shows an embodiment of the present invention. In this figure, the outlet 13B of the air intake pipe 13 is located inside the waste water reservoir 7 near the inlet 6A of the intake pipe 6, that is, the intake pipe 6
It is provided near the lower end opening 6A.

With such a structure, when the water level in the wastewater sump 7 rises to a predetermined water level HWL, the water level detection pipe 11
The air pressure inside increases, and this increase in air pressure is applied to the vacuum valve control means 12 to open the vacuum valve 4. As a result, the sewage in the sewage reservoir 7 is sucked into the vacuum sewer pipe 5 through the path from the suction pipe 6 to the open vacuum valve 4. As a result, when the level of the sewage in the sewage sump 7 is lowered to a level lower than the lower end opening 6A of the suction pipe 6, and the lower end opening 6A is exposed to suck air, the air intake pipe 13 Exit 13
B is also opened, and the air is easily supplied from the air intake pipe 13 to the suction pipe 6. As a result, most of the amount of air sucked into the suction pipe 6 is covered by the air supplied from the air intake pipe 13, and the suction pipe 6 is sucked from the inside of the vacuum valve mass 3.
Since the amount of air sucked in is suppressed to be small, it is possible to reduce the negative pressure in the vacuum valve mass 3. On the other hand, when the level of sewage in the sewage reservoir 7 drops to the lower end opening 6A of the suction pipe 6 and the outlet 13B of the air intake pipe 13, the lower end opening 11A of the water level detection pipe 11 is also opened, and the pressure in the water level detection pipe 11 is increased. Decreases, and the pressure is transmitted to the vacuum valve control means 12 to close the vacuum valve.

As described above, even when the vacuum valve 4 is opened, the negative pressure inside the vacuum valve mass 3 is alleviated, so that a high negative pressure is propagated to the traps of the sewage inflow pipe 10 and the sewage source 9. It is possible to prevent the occurrence of inconvenience such that the accumulated water in the trap is sucked to lower the water level, or the trap is damaged, which is adversely affected. Moreover, since the negative pressure in the vacuum valve mass 3 is relaxed regardless of the installation distance of the air intake pipe 13, it is possible to relax the restriction on the position setting of the inlet 13A when the air intake pipe 13 is installed. . Further, as the air intake pipe 13, a general pipe can be used as it is, so that the construction is easy and dust in the wastewater does not get caught.

[0011]

As described above, according to the present invention, since the outlet of the air intake pipe is provided near the inlet of the suction pipe in the waste water reservoir, the air intake pipe can be opened even if the vacuum valve is opened. The negative pressure inside the vacuum valve mass can be mitigated regardless of the installation distance. As a result, it is possible to reliably prevent a high negative pressure from being propagated to the sewage inflow pipe and the trap of the sewage generation source, suck the accumulated water in the trap on the sewage generation source side to lower the water level, or generate the sewage generation. It is possible to avoid the occurrence of inconvenience such as damaging the trap on the source side and the like.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 Vacuum pump 2 Sewage collection site 3 Vacuum valve mass 3A Invert (bottom of vacuum valve mass) 4 Vacuum valve 4A Vacuum valve outlet 4B Vacuum valve inlet 5 Vacuum sewer pipe 6 Suction pipe 6 Lower end opening of suction pipe (of suction pipe) Inlet) 7 Wastewater reservoir 9 Wastewater source 10 Wastewater inflow pipe 13 Air intake pipe 13B Air intake pipe outlet

Claims (1)

[Claims] 1. A sewage collection field equipped with a vacuum pump and an outlet of a vacuum valve arranged in a vacuum valve mass are communicated with each other by a vacuum sewer pipe, and an inlet of the vacuum valve is a suction pipe at the bottom of the vacuum valve mass. The waste water generated in the waste water source is configured to flow through the waste water reservoir to the waste water reservoir by the waste water inflow pipe, and the air is introduced into the vacuum valve mass to introduce air into the waste water reservoir. In a vacuum type sewage collection system provided with an intake pipe, an air intake in the vacuum type sewage collection system, characterized in that an outlet of the air intake pipe is provided in the waste water reservoir near an inlet of the suction pipe. Construction.