JP5909395B2 - Vacuum station - Google Patents

Description

  The present invention relates to a vacuum station installed in a vacuum sewer system that transports sewage such as domestic wastewater using vacuum, and in particular, a vacuum that collects sewage from a vacuum sewage pipe and then sends it to a sewage treatment plant or the like. It is about the station.

  In a vacuum sewer system, sewage discharged from a house or factory is guided to a sewage tank by natural flow and collected in a vacuum station via a vacuum sewage pipe. The sewage tank is provided with a vacuum valve that opens by the negative pressure from the vacuum station. When the amount of sewage in the sewage tank reaches a predetermined amount, the vacuum valve opens due to the negative pressure in the vacuum sewage pipe. Due to the negative pressure, the sewage in the sewage tank is collected in the vacuum station via the vacuum sewage pipe.

  The vacuum station is a facility that generates a vacuum to collect sewage, stores the collected sewage primarily, and then transports it to a sewage treatment plant, a sewage relay pump station, and a natural downstream main line. It is composed of a pump, a water collection tank that primarily stores collected sewage, a control panel that controls these devices, and the like. This type of vacuum station is equipped with a Roots-type vacuum pump, and is configured to alternately collect and drain sewage into the water collection tank by automatically operating forward and reverse. . A vacuum station equipped with a roots-type vacuum pump can collect and drain sewage without using a pressure pump, and therefore has an advantage that it is not easily blocked by foreign matter, has a high ultimate vacuum, and has high operating efficiency.

  Since the above-described vacuum station requires a predetermined installation space, when installing on the ground, securing the site in the ground part becomes a problem. Therefore, a vacuum pump and a water collection tank are accommodated in a manhole and installed underground (Patent Document 1).

JP 2008-63770 A

As described above, when a vacuum pump or a water collection tank is installed in the basement, a manhole is buried underground and the vacuum pump or the water collection tank is accommodated in the manhole.
However, when manholes are submerged due to flooding, manholes may have deteriorated water resistance of concrete due to deterioration over time, and waterstop of iron lids. There is a risk of being submerged. If the vacuum pump and the motor that drives the vacuum pump are submerged, the operation becomes impossible and water cannot enter the vacuum pump or the motor and cannot be restarted.
In this case, a drainage pump can be installed in the manhole to drain the water that has entered the manhole. However, when a large amount of water enters the manhole, the amount of water that enters the drainage is the amount of drainage from the drainage pump. More than that, the submersion of the vacuum pump cannot be avoided.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum station that can prevent submergence of accessory equipment such as a vacuum pump and a vacuum pump driving motor.

In order to achieve the above-mentioned object, one aspect of the vacuum station of the present invention is installed in a vacuum sewer system that conveys sewage with negative pressure inside the pipe, and generates a negative pressure that serves as power for conveying sewage. In a vacuum station, a vacuum pump installed in a manhole buried underground, and a cylindrical container having a closed upper end and an opened lower end, which is provided to prevent submergence to cover the vacuum pump. A dome, and an installation level of the vacuum pump is set at a position above a lower end of the submergence prevention dome, an air supply duct for supplying air from the ground is provided in the submergence prevention dome, Is located below the lower end of the submergence prevention dome, and an exhaust duct is provided for exhausting air from inside the submergence prevention dome. An opening is formed at the lower end of the exhaust duct, and the exhaust is further discharged from the opening. Wherein the extended duct to the outside of the manhole.
According to the present invention, even if the ground surface where the manhole is buried due to flooding etc. is flooded and the water enters and fills the manhole, the entire surface of the submergence prevention dome is formed to be watertight and airtight to prevent submergence. Since air can be confined in the dome, the water level entering the submergence prevention dome from the lower end of the submergence prevention dome is limited to a predetermined water level and does not reach the installation level of the pump. Therefore, the submersion of the vacuum pump can be prevented, and the vacuum pump can be protected from flooding.
According to the present invention, the lower opening of the air supply duct for supplying air into the submergence prevention dome is lowered from the lower end of the submergence prevention dome, and the exhaust duct for exhausting air from the submergence prevention dome is provided from the upper part of the submergence prevention dome. A gap (opening) is formed between the two exhaust ducts by being divided into an exhaust duct extending to a position below the lower end of the submergence prevention dome and an exhaust duct extending from the inside of the manhole to the outside. This prevents the inside of the submergence prevention dome from being directly connected to the outside by a duct, and even if the manhole is filled with water during a flood, the air inside the submergence prevention dome will not flow out, and the submergence prevention dome will be submerged. The prevention function is not lost. When the exhaust duct is configured by one exhaust duct without being divided into two exhaust ducts, an opening such as a slit is provided at a position corresponding to the gap (opening) between the two exhaust ducts. Just do it.

According to a preferred aspect of the present invention, the installation level of the vacuum pump is set to a position above the water level at which the ground surface where the manhole is embedded is submerged and enters the submergence prevention dome by water pressure. It is characterized by.
According to the present invention, even if the ground surface where the manhole is buried due to flooding etc. is flooded and water pressure is applied to the submergence prevention dome and water enters the submergence prevention dome, the water level in the submergence prevention dome is The installation level of the vacuum pump is not reached. Therefore, the submersion of the vacuum pump can be prevented, and the vacuum pump can be protected from flooding.

According to a preferred aspect of the present invention, when the ground surface in which the manhole is embedded is submerged and the water level rises to a planned high water level, and when the water pressure at the planned high water level is applied to the submergence prevention dome, The installation level of the vacuum pump is set so that the water level in the submergence prevention dome where the pressure in the submergence prevention dome balances the water pressure is lower than the installation level of the vacuum pump. Here, the planned high water level refers to the water level assumed at the time of flooding.
According to the present invention, when the ground surface where the manhole is buried is submerged and the water level rises from the ground level to the planned high water level, the water pressure at the planned high water level is applied to the submergence prevention dome. Therefore, according to Boyle's law (PV = constant), the air in the submergence prevention dome is compressed and water enters the submergence prevention dome. The water level in the submergence prevention dome rises until the water pressure at the planned high water level is balanced with the pressure in the submergence prevention dome. At this time, the water level in the submergence prevention dome is lower than the installation level of the vacuum pump. In position. Therefore, the submersion of the vacuum pump can be prevented, and the vacuum pump can be protected from flooding.

According to a preferred aspect of the present invention, a motor for driving the vacuum pump is installed above or above the installation level of the vacuum pump.
ADVANTAGE OF THE INVENTION According to this invention, the submersion of the motor which drives a vacuum pump can be prevented, and a motor can be protected from flood.

According to a preferred aspect of the present invention, one vacuum pump or a plurality of vacuum pumps are installed in the submergence prevention dome.
According to a preferred aspect of the present invention, one or more vacuum pumps are installed in the manhole, or a plurality of vacuum pumps are installed.
According to a preferred aspect of the present invention, a water collection tank for collecting sewage is installed in a manhole different from the manhole in which the vacuum pump is installed.
According to a preferred aspect of the present invention, a deodorizing device for deodorizing exhaust from the vacuum pump is installed in a manhole different from the manhole where the vacuum pump is installed.
According to a preferred aspect of the present invention, a water collection tank for collecting sewage is installed in the manhole in which the vacuum pump is installed.
According to a preferred aspect of the present invention, a deodorizing device for deodorizing exhaust from the vacuum pump is installed in a manhole in which the vacuum pump is installed.

According to a preferred aspect of the present invention, the plurality of manholes are communicated by underground piping, one of the manholes is communicated with an air supply tower, and another manhole is communicated with an exhaust tower.
According to the present invention, a plurality of manholes can be supplied and exhausted using one air supply tower and one exhaust cylinder. Therefore, the equipment cost can be reduced.

Another aspect of the vacuum station of the present invention is a vacuum station that is installed in a vacuum sewer system that conveys sewage with negative pressure inside the pipe, and is buried underground in a vacuum station that generates a negative pressure that is the power to convey sewage A vacuum pump installed in the manhole, and a cylindrical container having an upper end closed and a lower end opened, the submergence prevention dome provided to cover the vacuum pump, and the vacuum The installation level of the pump is set at a position above the lower end of the submergence prevention dome, an opening is provided at the upper end of the submergence prevention dome, and a sealing lid is provided to seal the opening so as to be openable and closable.
According to the present invention, when the vacuum pump is inspected, the sealing lid can be opened to inspect the vacuum pump, which is excellent in maintainability.

According to a preferred aspect of the present invention, the opening of the submergence prevention dome is formed of an oval or oval opening, the sealing lid is formed of an oval or oval sealing lid, and the closing lid is closed. Is characterized in that the outer periphery of the sealing lid closes the opening from below.
According to a preferred aspect of the present invention, a seal member is provided at an opening of the submergence prevention dome or an outer peripheral portion of the sealing lid.
According to the present invention, when water enters the manhole during flooding and water pressure is applied to the submergence prevention dome, the air confined in the submergence prevention dome is compressed and the internal pressure in the submergence prevention dome increases. Therefore, the sealing lid is pressed upward, the sealing member is further crushed, and the sealing degree of the submergence prevention dome can be increased.
According to a preferred aspect of the present invention, a control panel for controlling the vacuum pump is installed on the ground.

The present invention has the following effects.
(1) Since a vacuum pump is installed in a manhole buried underground, the vacuum pump is covered with a submergence prevention dome and the installation level of the vacuum pump is set at a position above the lower end of the submergence prevention dome. Thus, even if the vacuum station is submerged, it is possible to prevent the submergence of electrical equipment such as a vacuum pump and a motor for driving the vacuum pump by confining air in the submergence prevention dome.
(2) The submersion prevention measures are taken for the vacuum pump and the accessory equipment for the vacuum pump, and the main equipment can be safely placed underground. Therefore, the equipment installed on the ground part can be minimized.
(3) An opening is provided at the upper end of the submergence prevention dome, and this opening is sealed with a sealable lid that can be opened and closed. Therefore, the vacuum pump can be inspected by opening the seal lid when inspecting the vacuum pump. Are better.
(4) When water enters the manhole during flooding and water pressure is applied to the submergence prevention dome, the air confined in the submergence prevention dome is compressed and the internal pressure inside the submergence prevention dome increases, so the sealing lid When pressed, the hermetic seal is further crushed, and the sealing degree of the submergence prevention dome can be increased.

FIG. 1 is a schematic diagram showing a basic configuration of a vacuum station according to the present invention. 2A and 2B are diagrams showing a specific example of a vacuum station to which the configuration of the present invention shown in FIG. 1 is applied, and are schematic views showing an example in which a vacuum pump and a water collection tank are separately installed. . FIGS. 3A and 3B are diagrams showing another specific example of the vacuum station to which the configuration shown in FIG. 1 is applied, and are schematic diagrams showing an example in which a vacuum pump and a water collection tank are installed in the same manhole. It is. FIG. 4 is a schematic view showing an embodiment of a vacuum station to which the configuration of the present invention shown in FIG. 1 is applied. FIG. 5 is a schematic diagram showing the concept of ventilation in the vacuum pump and the submergence prevention dome shown in FIG. FIGS. 6A to 6D are diagrams showing a detailed structure of a submergence prevention dome provided with a sealing lid.

Embodiments of a vacuum station according to the present invention will be described below with reference to FIGS. 1 to 6, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a schematic diagram showing a basic configuration of a vacuum station according to the present invention. As shown in FIG. 1, the vacuum station 1 of the present invention includes a manhole 2 buried underground, a single vacuum pump 3 installed in the manhole 2 and capable of forward / reverse operation, and a vacuum pump 3 in the manhole 2. It is comprised from the submergence prevention dome 4 installed so that it might cover. In FIG. 1, GL is a ground level. The manhole 2 is composed of a concrete assembly type manhole. The manhole 2 may be a metal box-shaped manhole.

  An opening 2a for equipment inspection or the like is formed in the upper portion of the manhole 2, and the opening 2a is closed by an iron lid 2b that can be opened and closed. The upper surface of the iron lid 2b substantially coincides with GL. The vacuum pump 3 is composed of a roots-type vacuum pump that transports gas by synchronously rotating a pair of eyebrows or three-leaf rotors in opposite directions. The vacuum pump 3 is connected to a motor (not shown) for driving the vacuum pump 3 and is installed on the upper surface of the pump mount 5. Hereinafter, the upper surface of the pump mount 5 is referred to as a pump installation level PL. The motor for driving the vacuum pump 3 is also installed above the pump installation level PL or the pump installation level PL. The submergence prevention dome 4 for covering the vacuum pump 3 is formed of a cylindrical container having a closed upper end and an opened lower end, for example, a cylindrical container, and is formed of a metal such as a steel material or an aluminum alloy, or a synthetic resin such as FRP. Has been. The pump installation level PL is located above the lower end 4e of the submergence prevention dome 4 by a predetermined height (h).

  In the vacuum station 1 configured as shown in FIG. 1, even when the ground surface where the manhole 2 is buried due to flooding is flooded and water enters the manhole 2, the entire surface of the submergence prevention dome 4 is Since it is watertight and airtight and can confine air in the submergence prevention dome 4, the water level entering the submergence prevention dome 4 from the lower end 4 e of the submergence prevention dome 4 is limited to a predetermined water level, The pump installation level PL is not reached. Hereinafter, this point will be described.

数１より、洪水時には、ドーム内の空気の体積がＶ_１になる位置Ｈ_２まで水位が上昇するが、上昇するドーム内水位Ｈ_２より高い位置にポンプ設置レベルＰＬを設定することにより、真空ポンプ３の水没を防止することができ、真空ポンプ３を洪水から保護することができる。 As shown in FIG. 1, the pressure of the lower end 4e of submerged prevent dome 4 to flood when the water level HWL on the basis and H _1, water entering the submerged prevent dome 4 lower end 4e of submerged prevent dome 4 as reference the water level and _{H 2.} The flood water level HWL is a planned high water level which is a water level assumed at the time of flood. The initial volume of the submergence prevention dome 4 is V ₀ , and the pressure inside the dome is atmospheric pressure P ₀ (10 m water column). When the water pressure is received during a flood, the volume of air confined in the submergence prevention dome 4 is V _1. , The pressure inside the dome is P ₀ + H ₁ .
Here, the following equation is established between the volume V of air in the dome and the pressure P in the dome.
PV = constant Therefore, at the time of flood _{V 0 × P 0 = V 1} (P 0 + H 1)

From Equation 1, during floods, the water level rises to a position H ₂ where the volume of air in the dome becomes V ₁ , but by setting the pump installation level PL at a position higher than the rising dome water level H ₂ , The pump 3 can be prevented from being submerged, and the vacuum pump 3 can be protected from flooding.

Next, a specific example will be described. The submergence prevention dome 4 is assumed to have a cylindrical container shape, the inner diameter of the submergence prevention dome 4 is about 1.1 m, and the height from the lower end 4e to the upper end of the submergence prevention dome 4 is as follows. If it is about 1.3 m, the initial volume V ₀ of the submergence prevention dome 4 is about 1.2 m ³ . If the water pressure _{H 1} of the lower end 4e of submerged prevent dome 4 to flood when the water level HWL on the basis and 3m, the _{V 1} than the number 1 of about 1 m ^3. Therefore, dome water level _{H 2} rising at the time of flooding is about 0.2 m. From the above, the pump installation level PL is set at a position higher than the position 0.2 m from the lower end 4 e of the submergence prevention dome 4.

2A and 2B are diagrams showing a specific example of a vacuum station to which the configuration of the present invention shown in FIG. 1 is applied, and are schematic views showing an example in which a vacuum pump and a water collection tank are separately installed. .
In the vacuum station 1 shown in FIG. 2A, the vacuum pumps 3 are individually installed in the plurality of manholes 2. Each vacuum pump 3 is covered with a submergence prevention dome 4. Further, in another manhole 2, a water collection tank 6 for collecting sewage and a deodorizing device 7 for deodorizing exhaust from the vacuum pump 3 are installed. A control panel 8 for controlling each device such as the vacuum pump 3, the water collecting tank 6, and the deodorizing device 7 is installed on the ground.
In the vacuum station 1 shown in FIG. 2B, a plurality of (two) vacuum pumps 3 are installed in one manhole 2. The plurality of vacuum pumps 3 are covered with one submergence prevention dome 4. The water collection tank 6, the deodorizing device 7 and the control panel 8 are the same as the example shown in FIG.
As shown in FIG. 2A and FIG. 2B, the vacuum pumps 3 may be individually installed in one manhole 2 and each vacuum pump 3 may be individually covered with a submergence prevention dome 4. A plurality of vacuum pumps 3 may be installed in one manhole 2 and the plurality of vacuum pumps 3 may be covered with one submergence prevention dome 4.

FIGS. 3A and 3B are diagrams showing another specific example of the vacuum station to which the configuration shown in FIG. 1 is applied, and are schematic diagrams showing an example in which a vacuum pump and a water collection tank are installed in the same manhole. It is.
In a vacuum station 1 shown in FIG. 3A, a plurality of (two) vacuum pumps 3 and a water collection tank 6 are installed in one manhole 2. The vacuum pump 3 is individually covered with a submergence prevention dome 4. The water collection tank 6 is disposed below the vacuum pump 3. A deodorizing device 7 is installed in another manhole 2. The control panel 8 is installed on the ground.
In the example shown in FIG. 3B, a plurality of (two) vacuum pumps 3 and a water collection tank 6 are installed in one manhole 2. The plurality of vacuum pumps 3 are covered with one submergence prevention dome 4. The water collection tank 6 is disposed below the vacuum pump 3. The deodorizing device 7 and the control panel 8 are the same as the example shown in FIG.
As shown in FIGS. 3 (a) and 3 (b), a plurality of vacuum pumps 3 and a water collection tank 6 are installed in one manhole 2, and each vacuum pump 3 is individually connected with a submergence prevention dome 4. The plurality of vacuum pumps 3 may be covered with one submergence prevention dome 4.

  2 and 3, the control panel 8 is installed on the ground. However, if there is no installation space on the ground, the control panel 8 may be installed in the manhole 2 buried underground. In this case, since the control panel 8 uses a large number of electric / electronic devices, it is desirable that the control panel 8 be covered with the submergence prevention dome 4 similarly to the vacuum pump 3.

  FIG. 4 is a schematic view showing an embodiment of a vacuum station to which the configuration of the present invention shown in FIG. 1 is applied. In FIG. 4, the two manholes are discriminated by using reference numerals 2A and 2B. As shown in FIG. 4, the present vacuum station 1 has a vacuum pump 3 installed in one manhole 2A to cover the vacuum pump 3 with a submergence prevention dome 4, and a water collection tank 6 and a deodorizing device 7 in the other manhole 2B. The vacuum pump 3, the water collection tank 6 and the deodorizing device 7 are connected by a piping system. The control panel 8 is installed on the ground.

  As shown in FIG. 4, the vacuum pump 3 and the water collection tank 6 are connected by a pipe 11, and the vacuum pump 3 and the deodorizing device 7 are connected by a pipe 12. The water collection tank 6 is connected to a vacuum pipe (vacuum sewage pipe) 13 for allowing sewage to flow into the water collection tank 6 and also connected to a pressure feed pipe 14 for pumping the sewage in the water collection tank 6. ing. An air introduction pipe 15 is connected to the water collection tank 6, and a vacuum break valve V <b> 1 is provided in the air introduction pipe 15.

  The deodorizing device 7 is connected to a supply / exhaust tower 17 with a silencer by a pipe 16. An air supply duct 18 with a built-in air supply fan Fa is connected to the manhole 2 </ b> A that accommodates the vacuum pump 3, and an air supply tower 19 with a silencer is installed at the upper opening end of the air supply duct 18. . The lower opening end of the air supply duct 18 is opened near the lower end 4 e of the submergence prevention dome 4.

  An exhaust duct 20A extending from the upper part of the submergence prevention dome 4 to the lower end 4e is installed in the submergence prevention dome 4, and an exhaust duct 20B is installed opposite the lower end opening of the exhaust duct 20A. And the manhole 2A and the manhole 2B are connected by the exhaust duct 20B. A dew condensation drain water distribution pipe 21 is provided at the lower part of the manhole 2A, and the dew condensation drain water distribution pipe 21 extends to the lower part of the manhole 2B. An exhaust duct 22 is connected to the upper part of the manhole 2B, and the upper opening end of the exhaust duct 22 is connected to the supply / exhaust tower 17.

  According to the vacuum station configured as shown in FIG. 4, sewage is collected through the vacuum line 13 into the water collection tank 6 when the pressure in the water collection tank 6 is between the operation start pressure and the operation stop pressure. At this time, since the check pipe V2 is provided in the pressure feed pipe 14, the sewage in the pressure feed pipe 14 does not flow backward. When the sewage water level in the water collection tank 6 becomes a high water level, the vacuum pump 3 is operated in reverse, the inside of the water collection tank 6 is pressurized, and the sewage is drained through the pressure feed pipe 14. At this time, since the check line V3 is provided in the vacuum line 13, sewage and air do not flow back through the vacuum line 13, and the pressure in the vacuum line 13 is maintained at a negative pressure. Further, in the normal rotation operation of the vacuum pump 3, the exhaust from the vacuum pump 3 is guided to the deodorizing device 7 through the pipe 12 and deodorized, and is exhausted from the supply / exhaust tower 17.

  As shown in FIG. 4, by installing the vacuum pump 3, the water collection tank 6, and the deodorizing device 7 other than the control panel 8 in the manholes 2A and 2B, the installation space on the ground can be reduced. Then, by covering the vacuum pump 3 with the submergence prevention dome 4, even if a flood or the like occurs and the manhole 2 </ b> A is filled with water, the submersion of the vacuum pump 3 and attached devices such as a motor that drives the vacuum pump 3 is submerged. Can be prevented. In the example shown in FIG. 4, an opening 4 a is provided at the upper end of the submergence prevention dome 4, and a sealing lid 10 is provided to seal the opening 4 a so as to be opened and closed (described later).

FIG. 5 is a schematic diagram showing the concept of ventilation in the vacuum pump 3 and the submergence prevention dome 4 shown in FIG. As shown in FIG. 5, an air supply duct 18 incorporating an air supply fan Fa is connected to the manhole 2 </ b> A housing the vacuum pump 3, and an air supply with a silencer is provided at the upper opening end of the air supply duct 18. A tower 19 is installed. The lower opening 18 a of the air supply duct 18 is located slightly below the lower end 4 e of the submergence prevention dome 4.
Further, in the submergence prevention dome 4, an exhaust duct 20A extending from the upper part of the submergence prevention dome 4 to slightly below the lower end 4e is installed, and the exhaust duct 20B is installed facing the opening at the lower end of the exhaust duct 20A. Yes. And the manhole 2A and the manhole 2B are connected by the exhaust duct 20B (refer FIG. 4).

  With the configuration as shown in FIG. 5, air is supplied into the submergence prevention dome 4 by the air supply duct 18. The supply air flows around the vacuum pump 3 to cool the vacuum pump 3, and then flows into the exhaust duct 20A from the upper end opening of the exhaust duct 20A, and flows into the exhaust duct 20B from the lower end opening of the exhaust duct 20A. As shown in FIG. 5, the lower opening 18 a of the air supply duct 18 for supplying air into the submergence prevention dome 4 is lowered from the lower end 4 e of the submergence prevention dome 4, and the exhaust duct for exhausting from the submergence prevention dome 4. Is divided into an exhaust duct 20A extending from the upper part of the submergence prevention dome 4 to below the lower end 4e of the submergence prevention dome 4 and an exhaust duct 20B extending from the inside of the manhole 2A to the outside, and a slight gap is formed between the exhaust duct 20A and the exhaust duct 20B. g is formed. This prevents the inside of the submergence prevention dome 4 from being directly connected to the outside by the duct, and even if the manhole 2A is filled with water during a flood, the air inside the submergence prevention dome 4 will not flow out, preventing the submergence. The submergence prevention function of the dome 4 is not lost. In addition, what is necessary is just to provide opening parts, such as a slit, in the location corresponding to the said clearance gap g, when it comprises with one exhaust duct, without dividing an exhaust duct into the exhaust duct 20A and the exhaust duct 20B.

FIGS. 6A to 6D are views showing a detailed structure of the submergence prevention dome 4 provided with the sealing lid 10. 6A is a plan view of the submergence prevention dome 4 and the sealing lid 10, FIG. 6B is a partial sectional view of the submergence prevention dome 4 and the sealing lid 10, and FIG. 6C is a submergence prevention dome 4 and the sealing lid. FIG. 6D is a side view showing the fastening portion between the submergence prevention dome 4 and the sealing lid 10.
As shown in FIGS. 6A and 6B, the submergence prevention dome 4 is provided with an elliptical sealing lid 10 that seals the elliptical opening 4 a at the upper end of the submergence prevention dome 4 so that it can be opened and closed. It has been. The sealing lid 10 is fixed to the submergence prevention dome 4 by a plurality of (six) fasteners 30. The opening 4a and the sealing lid 10 may be oval or rectangular.
As shown in FIG. 6C, the opening 4 a of the submergence prevention dome 4 is bent at a substantially right angle downward from the upper surface of the submergence prevention dome 4 and is formed into an elliptical cylindrical shape. On the other hand, the outer peripheral portion of the sealing lid 10 is bent downward at a substantially right angle, then folded outward at a substantially right angle, and further bent upward at a substantially right angle. Thereby, a concave engaging portion 10 a is formed at the lower end portion of the sealing lid 10. A hermetic seal 31 made of rubber packing or the like is fixed to the engaging portion 10a. A plurality (six) screws 32 are fixed to the upper surface of the sealing lid 10 by welding or the like.

  In the submergence prevention dome 4 and the sealing lid 10 configured as described above, when the sealing lid 10 is attached to the submergence prevention dome 4 and the opening 4a is sealed, the short axis and the elliptical shape of the elliptical sealing lid 10 are used. The sealing lid 10 is inserted into the opening 4a with the long axis of the shaped opening 4a roughly aligned, and the sealing lid 10 is rotated so that the long axis of the sealing lid 10 and the long axis of the opening 4a are aligned and sealed. By pulling up the lid 10, the engaging portion 10 a of the sealing lid 10 is engaged with the opening 4 a. At this time, the lower end of the opening 4 a contacts the hermetic seal 31. Thereafter, as shown in FIGS. 6 (c) and 6 (d), the hole of the fastener 30 is passed through the screw 32, and the lower end of the fastener 30 is placed on the upper surface of the submergence prevention dome 4 and the upper surface of the sealing lid 10. The sealing lid 10 is lifted by abutting and tightening the wing nut 33 on the screw 32, and the engaging portion 10a is engaged with the opening 4a with the sealing seal 31 interposed therebetween. Thereby, the opening 4 a of the submergence prevention dome 4 can be sealed by the sealing lid 10. The hermetic seal 31 may be provided on the opening 4a side, or may be provided on the hermetic lid 10 side.

  By configuring as shown in FIGS. 6A to 6D, when the vacuum pump 3 is inspected, the sealing lid 10 can be opened and the vacuum pump 3 can be inspected. In addition, by forming the sealing lid 10 from a light metal or the like, the sealing lid 10 can be easily opened and closed, and the maintainability can be improved. When water enters the manhole during flooding, the water fills the manhole and water pressure is applied to the submergence prevention dome 4, the air trapped in the submergence prevention dome 4 is compressed and the inside of the submergence prevention dome 4 is compressed. Pressure increases. Therefore, the sealing lid 10 is pressed upward, the sealing seal 31 is further crushed, and the sealing degree of the submergence prevention dome 4 can be increased.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Vacuum station 2 Manhole 2a Opening 2b Iron lid 3 Vacuum pump 4 Submergence prevention dome 4e Lower end 5 Pump mount 6 Water collection tank 7 Deodorizing device 8 Control panel 10 Sealing lid 10a Engagement part 11, 12 Piping 13 Vacuum pipe (vacuum sewer pipe )
DESCRIPTION OF SYMBOLS 14 Pressure feed pipe 15 Atmospheric introduction pipe 17 Supply / exhaust tower 18 Supply duct 19 Supply / exhaust tower 20A, 20B Exhaust duct 21 Condensation drain water distribution pipe 22 Exhaust duct 30 Fastening tool 31 Sealing seal 32 Screw 33 Wing nut Fa Supply fan g Gap GL Ground level HWL Water level during flooding PL Pump installation level V1 Vacuum break valve V2, V3 Check valve

Claims (15)

In a vacuum station that is installed in a vacuum sewer system that transports sewage with negative pressure inside the pipeline, and generates negative pressure that is the power to transport sewage,
A vacuum pump installed in a manhole buried underground,
A cylindrical container having an upper end closed and a lower end opened, and a submergence prevention dome provided so as to cover the vacuum pump,
Set the installation level of the vacuum pump at a position above the lower end of the submergence prevention dome ,
An air supply duct for supplying air from the ground is provided in the submergence prevention dome, a lower opening of the air supply duct is positioned below a lower end of the submergence prevention dome, and an exhaust duct for exhausting from the submergence prevention dome is provided. 2. A vacuum station , wherein an opening is formed at a lower end portion of the exhaust duct, and the exhaust duct is further extended from the opening to the outside of the manhole .   The installation level of the vacuum pump is set to a position above a water level at which a ground surface where the manhole is embedded is submerged and infiltrated into the submergence prevention dome by water pressure. The vacuum station according to 1.   When the ground surface in which the manhole is buried is flooded and the water level rises to the planned high water level, and the water pressure at the planned high water level is applied to the submergence prevention dome, the pressure in the submergence prevention dome and the water pressure are increased. 3. The vacuum station according to claim 2, wherein the installation level of the vacuum pump is set so that the water level in the submergence prevention dome that balances with the vacuum pump is lower than the installation level of the vacuum pump.   The vacuum station according to any one of claims 1 to 3, wherein a motor for driving the vacuum pump is installed above or above the installation level of the vacuum pump.   5. The vacuum according to claim 1, wherein one or more vacuum pumps are installed in the submergence prevention dome. station.   6. The vacuum station according to claim 5, wherein one vacuum pump or a plurality of vacuum pumps are installed in the manhole.   The vacuum station according to claim 1, wherein a water collection tank for collecting sewage is installed in a manhole different from the manhole in which the vacuum pump is installed.   8. The vacuum station according to claim 7, wherein a deodorizing device for deodorizing exhaust from the vacuum pump is installed in a manhole different from the manhole in which the vacuum pump is installed.   The vacuum station according to any one of claims 1 to 6, wherein a water collection tank for collecting sewage is installed in a manhole in which the vacuum pump is installed.   The vacuum station according to claim 9, wherein a deodorization device for deodorizing exhaust from the vacuum pump is installed in a manhole in which the vacuum pump is installed. Said plurality of manhole communicates underground pipe, communicates with one manhole of which the supply column, any one of claims 1, 7 to 1 0, characterized in that communicated another manhole exhaust tower 2. A vacuum station according to item 1. In a vacuum station that is installed in a vacuum sewer system that transports sewage with negative pressure inside the pipeline, and generates negative pressure that is the power to transport sewage,
A vacuum pump installed in a manhole buried underground,
A cylindrical container having an upper end closed and a lower end opened, and a submergence prevention dome provided so as to cover the vacuum pump,
Set the installation level of the vacuum pump at a position above the lower end of the submergence prevention dome,
The submerged opening provided at the upper end of the anti-Dome, vacuum station characterized in that a sealing lid for openably closing the opening. The opening of the submergence prevention dome is formed of an oval or oval opening, the sealing lid is formed of an oval or oval sealing lid, and the outer periphery of the sealing lid is closed when the sealing lid is closed. 13. The vacuum station according to claim 12, wherein the opening is closed from below. The vacuum station according to claim 13 , wherein a seal member is provided at an opening of the submergence prevention dome or an outer peripheral portion of the sealing lid. The vacuum station according to any one of claims 1 to 14 , wherein a control panel for controlling the vacuum pump is installed on the ground.

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