JP2601577B2 - Vacuum type wastewater collection 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 vacuum system comprising a sewage tank, a vacuum line for conveying sewage flowing into the sewage tank, and a vacuum pump for sucking and conveying the sewage through the vacuum line. The present invention relates to a wastewater collection device.

[0002]

2. Description of the Related Art Conventionally, a vacuum-type wastewater collecting apparatus of this type is a branch line which joins a main line directly connected to a vacuum pump in a vacuum line and is located immediately before the junction or a plurality of the main line and the branch line. A safety valve for manual operation is provided at a location to maintain the degree of vacuum on the downstream side when the degree of vacuum in the vacuum line is reduced due to an accident or the like.

[0003]

However, according to the above-mentioned vacuum sewage collecting apparatus, the vacuum circuit is damaged or the vacuum valve in the sewage tank connected to the branch line is damaged, and the air flows into the vacuum pipe. In such a case, there is a disadvantage that it takes time to specify the damaged portion and the recovery work becomes complicated. To elaborate,
For example, at night, a safety valve provided on a branch line is sequentially closed from the upstream side or the downstream side, and a leak detector that measures using sound waves, or a work to identify a damaged part using a simple vacuum pump and a test ball Is required.
An object of the present invention is to eliminate the above-mentioned conventional disadvantages.

[0004]

In order to achieve the object, a vacuum type wastewater collecting apparatus according to the present invention is characterized in that a pressure detecting means for detecting a degree of vacuum in the pipe and a safety valve are provided in the vacuum pipe, A control means for automatically closing the safety valve when the pressure detected by the pressure detecting means becomes equal to or higher than a set pressure is provided. It is preferable that the pressure detecting means is provided on the upstream side of the vacuum line with respect to the safety valve. The pressure detecting means is constituted by first pressure detecting means provided on the upstream side of the vacuum pipe with respect to the safety valve and second pressure detecting means provided on the downstream side, and the control means comprises the first The safety valve is closed when the pressure detected by the pressure detecting means becomes equal to or higher than a set pressure, and thereafter, the pressure detected by the first pressure detecting means is maintained at a constant pressure lower than the atmospheric pressure, and the second pressure It is preferable that the safety valve be opened when the pressure detected by the detecting means returns to the set pressure. The pressure detecting means is provided in the vicinity of the steep ascending portion of the vacuum pipe, which is laid by alternately arranging a gentle descending slope portion and a steep ascending portion. Is preferred.

[0005]

When the pressure detected by the pressure detecting means is equal to or higher than the set pressure required for sucking and conveying the sewage in the vacuum pipe, the control means controls the facility such as the vacuum pipe provided with the pressure detecting means. It is determined that an accident such as breakage has occurred somewhere, and the safety valve is automatically closed without manual intervention to maintain the negative pressure in the vacuum line. By installing the pressure detecting means on the upstream side of the safety valve, it is possible to quickly maintain the negative pressure on the downstream side due to the closing of the safety valve. When the pressure detecting means comprises a first pressure detecting means provided on the upstream side of the vacuum pipe with respect to the safety valve and a second pressure detecting means provided on the downstream side, the control means comprises the first pressure detecting means When the detected pressure is equal to or higher than the set pressure, it is determined that an accident has occurred upstream of the safety valve, and the safety valve is closed. Thereafter, the pressure detected by the first pressure detecting unit is lower than the atmospheric pressure. When the constant pressure is maintained and the pressure detected by the second pressure detecting means returns to the set pressure, the accident at the upstream side of the safety valve is temporary, or the safety valve at the upstream side is closed due to blockage. When it is determined that the pressure has been secured, the safety valve is controlled to be opened. Thereby, even if an accident such as breakage occurs, the function of the vacuum-type wastewater collecting device on the downstream side of the accident occurrence location can be utilized to the utmost. By providing the pressure detecting means in the vicinity of the steep ascending slope portion of the vacuum conduit which is laid by arranging the gentle descending slope portion and the steep ascending portion alternately and laid. Even if sewage accumulates in the vacuum conduit, the pressure in the conduit can always be measured because the pressure detecting means does not submerge.

[0006]

Therefore, according to the vacuum type sewage collecting apparatus of the present invention, when the vacuum circuit is damaged or the vacuum valve in the sewage tank connected to the branch line is damaged and the air flows into the vacuum pipe line. Even if there is, the upstream side can be separated from the damaged portion, and the downstream side can be quickly returned to the normal state.

[0007]

Embodiments of the present invention will be described below. As shown in FIG. 3, the vacuum type sewage collection device includes a sewage tank 1 for storing sewage generated from each house, a vacuum line 2 for sucking and conveying the sewage in the sewage tank 1, and a vacuum line 2 maintained at a negative pressure. And a vacuum station 3 for sucking sewage. The vacuum station 3 includes a suction pump P1 for sucking sewage from the sewage tank 1, a water collection tank 4 for collecting sewage, and a water supply pump P2 for sending sewage in the water collection tank 4 to a treatment plant (not shown).
And a control panel 5 for controlling them. When the set water level is detected by a water level detecting means (not shown), the sewage tank 1 is opened and the sewage flows out to the vacuum line 2. Is provided with a vacuum valve 6 which is closed when the pressure drops, and an auxiliary buffer tank 1 for preventing a rapid inflow into the sewage tank 1 if necessary.
4 is provided. The vacuum line 2 is composed of a large-diameter trunk 21 directly connected to the vacuum station 3, each sewage tank 1, and the trunk 2.
Approximately 200 m
A maintenance port for cleaning work is provided in the pipeline at the interval or at the end of the branch line 22, and a vacuum pipe other than the working area is used for maintenance and expansion of facilities at a junction of the branch line 22 with the main line 21 and at an upstream side thereof. A plurality of safety valves 15 for maintaining 2 at a negative pressure are provided. As shown in FIG.
In the case of upward transport on an upward slope or horizontal transport on a horizontal ground, the downward slope section 7 that transports sewage downflow at a gentle downward slope of about 0.2%, and recovers the burial depth of pipelines A steep ascending part 8 for ascending a pipeline of several tens of cm at an angle of about 45 ° from a horizontal plane for sucking and conveying sewage on the ascending ground is arranged at intervals of about 150 m, The safety valves 15 are arranged at an interval of about 400 m to about 500 m for upward transport, horizontal transport, and downward transport. As shown in FIG. 4, in the above-mentioned steep ascending portion 8, the sewage collected in the lower portion of the ascending portion 8 of the vacuum pipe 2 is expanded in the pipe by the air sucked when the vacuum valve 6 is opened. And is transported. Therefore, in the vicinity of the downstream side of the uphill section 8, the upper part of the pipeline is not usually submerged, and the safety valve 15 and the pressure detecting means 16 described below are used near the downstream side of the sharp uphill section 8 in upward conveyance or horizontal conveyance. 8A.

As shown in FIG. 1, the safety valve 15 is provided with a valve housing 15A, and moves up and down in the valve housing 15A to
And a drive mechanism 15C including an electromagnetic motor M for driving the valve body 15B up and down, a speed reduction mechanism, and a manual handle. The electromagnetic motor M is controlled by control means 17 described below. A diaphragm pressure gauge for providing a first pressure detecting means 16A in the upper part of the vacuum line 2 near the upstream side of the safety valve 15 and a second pressure detecting means 16B in the upper part near the downstream side of the safety valve 15 to detect the degree of vacuum in the line. The pressure detecting means 16 is constituted as described above. The pressure in the vacuum line 2 is set and maintained at -6 mAq to -7 mAq by the suction pump P1. The control unit 17 includes an input unit 17A for inputting the pressure detected by the pressure detection unit 16, a determination unit 17B for determining whether the pressure input to the input unit 17A falls within a set pressure range, and a setting pressure range. When deviating, electromagnetic motor M
, And is connected to the control panel 5 of the vacuum station 3 so that the output from the abnormality notifying unit 17D is transmitted via a communication cable. More specifically, the pressure detected by the first pressure detecting means 16A by the determination unit 17B is -6 mAq.
When it is determined that the pressure deviates from the set pressure of −7 mAq to the atmospheric pressure, the drive unit 17C drives the electromagnetic motor M to close the safety valve 15 so that the pressure on the downstream side increases. To prevent After that, the determination unit 17B
When it is determined that the pressure detected by the second pressure detecting means 16B is within the set pressure range and that the pressure detected by the first pressure detecting means 16A is less than the atmospheric pressure and is stable at a constant value, The unit 17C drives the electromagnetic motor M to open the closed safety valve 15. The safety valve 15
After the closing of the first pressure detecting means 16A,
When it is determined that the pressure detected by the pressure approaches the atmospheric pressure,
Activate the abnormality notification means to issue a warning.

Hereinafter, another embodiment of the present invention will be described. In the above embodiment, the pressure detecting means 16 is described as a diaphragm pressure gauge. However, the pressure sensor is not limited to this. For example, an arbitrary sensor such as a Knudsen gauge may be used. In the above embodiment, the pressure detecting means 16 is provided in the vicinity of the upstream side and the downstream side of the safety valve 15 in the vacuum pipe 2. However, the pressure detecting means 16 is provided only on the upstream side. You may.

[0010] In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a main part.

FIG. 2 is an explanatory view of the arrangement of a vacuum conduit.

FIG. 3 is an overall configuration diagram of a vacuum-type sewage collection device.

FIG. 4 is an explanatory diagram of a sewage flow in an uphill section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage tank 2 Vacuum line 15 Safety valve 16 Pressure detecting means 17 Control means P1 Pump

Claims (4)

(57) [Claims] 1. A sewage tank (1), a vacuum pipe (2) for conveying sewage flowing into the sewage tank (1), and a vacuum pump (P1) for sucking and conveying the sewage through the vacuum pipe (2). )
And a pressure detecting means (16) for detecting the degree of vacuum in the pipe and a safety valve (15) are provided in the vacuum pipe (2), and the pressure detecting means ( The control means (1) for automatically closing the safety valve (15) when the pressure detected by (16) becomes equal to or higher than the set pressure.
7) A vacuum-type wastewater collecting apparatus configured to include: 2. A vacuum-type wastewater collecting apparatus according to claim 1, wherein said pressure detecting means (16) is provided on the upstream side of said vacuum pipe (2) with respect to said safety valve (15). 3. A first pressure detecting means (16A) provided on the upstream side of the vacuum line (2) with respect to the safety valve (15), and a second pressure detecting means (16A) provided on the downstream side with respect to the safety valve (15). Pressure control means (16B), and the control means (1
7) closing the safety valve (15) when the pressure detected by the first pressure detection means (16A) becomes equal to or higher than a set pressure, and thereafter, the detection pressure by the first pressure detection means (16A) is reduced. 2. The vacuum according to claim 1, wherein the safety valve is opened when the constant pressure lower than the atmospheric pressure is maintained and the pressure detected by the second pressure detecting means returns to a set pressure. Type wastewater collection device. 4. The pressure detecting means (16) is provided with a downward slope (7) having a gentle slope and an upward slope (8) having a steep slope.
The vacuum type sewage collecting apparatus according to claim 1, wherein the vacuum pipes (2) are provided in the vicinity of a steeply rising ascending portion (8 A) of the vacuum pipes (2) arranged and laid alternately. 5.