JPH0747488Y2 - Vacuum station - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a vacuum station provided in a vacuum sewer system.

[0002]

2. Description of the Related Art FIG. 3 is a side sectional view showing an outline of a vacuum sewer system. This equipment consists of a relay unit 3 connected to a building 1 such as a general household by a horizontal drainage pipe 2 in the ground.
And a vacuum station 5 connected from the relay unit 3 by a vacuum sewer pipe 4. In the relay unit 3, the wastewater collected from several buildings 1 is stored until reaching a predetermined amount, and in the vacuum station 5, a negative pressure is generated to collect the wastewater stored in the relay unit 3 together with an appropriate amount of air. It is designed to be collected by suction. Such a vacuum sewage system requires almost no drop between the start end and the end of the vacuum sewage pipe 4, and has the advantage that the pipe diameter can be made small. It is an improvement of the problem.

The vacuum station 5 includes a water collecting tank 6
And an ejector 7 for generating a negative pressure facing the discharge port 7a in the water collection tank 6, a circulation pump 8 for supplying dirty water to the ejector 7, and a drain pipe 9 joined to the water storage area 6a of the water collection tank 6. It is equipped with and. Vacuum station 5
Circulates the waste water stored in the water collection tank 6 to the ejector 7 by the circulation pump 8 to bring the vacuum sewer pipe 4 into a vacuum suction state by the negative pressure generated in the ejector 7. The vacuum station 5 using the ejector 7 has advantages that the ejector 7 and the circulation pump 8 can be easily maintained and maintained, and that the water collection tank 6 is an open type so that it is not necessary to stop the operation during cleaning. is doing.

[0004]

[Problems to be solved by the device] However, the ejector 7
The vacuum station 5 using the method has the following drawbacks. (A) The energy efficiency of the vacuum sewage pipe 4 and the energy supplied to the motor of the circulation pump 8 are synergistically related to the efficiency of the circulation pump 8 and the efficiency of the ejector 7. Therefore, in order to achieve a high degree of vacuum in a large-scale system, the energy efficiency is low, and much energy is input to the motor of the circulation pump 8. (B) When deodorization is required for pollution control, it is necessary to install an exhaust device in the water collection tank 6. SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a vacuum station capable of obtaining a high suction negative pressure without lowering energy efficiency and having an exhaust function.

[0005]

[Means for Solving the Problems] Means adopted by the vacuum station according to the present invention are: a water collecting tank, an ejector with a discharge port facing the water collecting tank, and drainage joined to a water storage area of the water collecting tank. In a vacuum station provided with a pipe, the water collection tank is formed airtight, an air outlet of the water collection tank is exposed to the air region, and the suction side of the exhaust blower is joined to the air outlet.

[0006]

[Operation] When the exhaust blower starts, the water in the water collection tank is discharged to the outside by the exhaust blower, and is in a negative pressure state. The negative pressure generated by the activation of the exhaust blower is added to the suction pressure of the ejector because the discharge port of the ejector opens in the water collection tank. Therefore, the suction negative pressure of the vacuum sewer pipe increases with the activation of the exhaust blower.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings.

(First Embodiment) FIG. 1 is a sectional view showing a first embodiment of a vacuum station according to the present invention. In the improved part of this embodiment, the water collecting tank 16 of the vacuum station 15 is formed airtight, and the exhaust port 11 is exposed to the air region 16b of the water collecting tank 16 so that the exhaust port 1
1 and the suction side 12a of the exhaust blower 12 are joined by a duct 13. Except for this improvement, it has the same configuration as the conventional vacuum station 5 (see FIG. 3).

As the exhaust blower 12, a turbo blower or the like is used, and a suction pressure of about -1 to -2 meters in water column pressure is selected. The air volume of the exhaust blower 12 is slightly larger than the air volume sucked by the ejector 7 from the vacuum sewer pipe 4. The reason why the amount is a little larger is that it is necessary to consider leaks in the water collection tank 16.

A deodorizing device (not shown) of an appropriate system such as an activated carbon adsorption system is provided at an appropriate place such as the duct 13 or the discharge side 12b of the exhaust blower 12 as required. The water collection tank 16 is provided with an inspection door (not shown) facing the air region 16b in an airtight state at an appropriate place such as a ceiling.

Next, the operation mode of this embodiment will be described. When the exhaust blower 12 is activated, the air region 16b of the water collection tank 16 is in a negative pressure state (for example, −2 meters in water column). When the circulation pump 8 is activated, the ejector 7 sucks the sewage mixed with air from the vacuum sewer pipe 4 and discharges it to the water storage area 16a of the water collection tank 16. The suction negative pressure generated in the vacuum sewer pipe 4 is generated only by the circulation pump 8.
Is added to the negative pressure (for example, -5 meters for the water column) that occurs in the air area 16b of the water collection tank 16 to obtain a value (for example, -7 meters for the water column). The air discharged from the vacuum sewer pipe 4 into the water collecting tank 16 is exhausted by the exhaust blower 12
Is sucked in and discharged to the outside. The energy efficiency in raising the suction negative pressure generated in the vacuum sewer pipe 4 is
Compared to the case where the capacity of only the circulation pump 8 and the ejector 7 is increased, the case where the exhaust blower 12 is provided with the capacity of the circulation pump 8 and the ejector 7 unchanged is superior. The reason is that the former is synergistically related to the efficiency of the circulation pump 8 and the efficiency of the ejector 7, while the latter is determined only by the efficiency of the exhaust blower 12. In the present embodiment, the ejector 7 can be operated even if the air area 16b of the water collection tank 16 is at atmospheric pressure due to cleaning of the water collection tank 16, inspection of the exhaust blower 12, etc. No need to shut down the system.

(Second Embodiment) FIG. 2 is a sectional view showing a second embodiment of the vacuum station according to the present invention. This embodiment is largely different from the first embodiment in that the entire vacuum station 25 is buried in the ground, a lid 27 is detachably attached to an inspection manhole 24 facing the ground, and a flexible duct 13 is attached to the lid 27. It is the point that connected. The vacuum station 25 has a main body tank 28 formed of a material such as FRP, and is partitioned into a water collection tank 26 and a machine room 29 by a partition wall 28a. In the figure, 30 is a submersible pump connected to the drainage pipe 9.

[0013]

As described above in detail, the vacuum station according to the present invention has the following practical effects because the water storage area of the water collection tank can be forcibly made negative by the exhaust blower. Even when achieving high suction negative pressure in a large-scale system, it is energy efficient and energy saving. The odor in the water collection tank can be forcibly exhausted collectively by the exhaust blower. Even if the air area of the water collection tank is at atmospheric pressure due to cleaning of the water collection tank or inspection of the exhaust blower, the ejector can be operated, so the system will not be completely stopped.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the present invention.

FIG. 3 is a side sectional view showing an outline of a conventional vacuum sewer system.

[Explanation of symbols]

7 ... Ejector 9 ... Drain pipe 11 ... Exhaust port 1
2 ... Exhaust blower 16 (26) ... Water collection tank 16a ... Water storage area 16
b ... Air area 15 (25) ... Vacuum station

Claims (1)

[Scope of utility model registration request] 1. A vacuum station provided with a water collection tank, an ejector having a discharge port facing the water collection tank, and a drain pipe joined to a water storage area of the water collection tank, wherein the water collection tank is hermetically sealed. A vacuum station, wherein the vacuum station is formed, an exhaust port is exposed to an air region of the water collection tank, and the suction side of an exhaust blower is joined to the exhaust port.