JP2014098282A - Vacuum pump unit and vacuum station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress corrosion of a vacuum pump.SOLUTION: A vacuum pump unit 300 includes a vacuum pump 314 which sucks exhaust from a water collection tank 202 in which sewage and exhaust transported together with the sewage are collected, a hydrogen sulfide removing device 362 which is provided in a feed/discharge pipe 120 linking the water collection tank 202 and vacuum pump 314 to each other and removes a corrosive component included in the exhaust, and a bad odor removing device 360 which is provided in the feed/discharge pipe 120 connected to a downstream side of the vacuum pump 314 and removes a bad odor component included in the exhaust discharged from the vacuum pump 314. The corrosive component is removed upstream from the vacuum pump 314, so that corrosion of the vacuum pump 314 can be suppressed.

Description

  The present invention relates to a vacuum pump unit and a vacuum station in a vacuum sewer system.

  A vacuum sewer system is a system that collects liquid (hereinafter referred to as sewage) including domestic wastewater generated at home to a vacuum station via a vacuum valve unit and a vacuum sewage pipe. The vacuum station is equipped with a vacuum pump that generates vacuum as a driving force for collecting sewage, a water collection tank that temporarily stores the collected sewage, and the sewage stored in the water collection tank to a sewage treatment plant, etc. It is a transport facility.

  The vacuum pump draws a gas (hereinafter referred to as “exhaust”) accompanying sewage from the water collection tank, thereby bringing the inside of the water collection tank to a negative pressure (about −80 kPa to −50 kPa). Further, a vacuum valve unit is connected to the water collection tank via a vacuum sewage pipe. By making the inside of the water collection tank have a negative pressure by the vacuum pump, the sewage temporarily stored in the vacuum valve unit is transported along with the exhaust through the vacuum sewage pipe and stored in the water collection tank.

  As one form of a conventional vacuum station, as described in Patent Document 1, a vacuum pump unit and a deodorizing device for removing odorous components contained in exhaust gas are installed on the ground, and a water collection tank unit is installed underground. A buried type under the road was known.

  In such a vacuum station, for example, an activated carbon system is adopted as the deodorizing apparatus, and the deodorizing apparatus is installed on the exhaust discharge side of the vacuum pump. The reason for installing a deodorizer on the exhaust discharge side of the vacuum pump is that the partial pressure of odor components contained in the exhaust is higher at atmospheric pressure than at negative pressure, so it is more easily adsorbed by activated carbon, and the deodorizer is compatible with negative pressure. This is because the cost can be suppressed.

Japanese Patent No. 4105605

  However, in the prior art, a corrosive component contained in an odor component in exhaust gas has not been considered.

  That is, the odor component in the exhaust contains a component (corrosive component) that corrodes cast iron constituting the vacuum pump. When the deodorizing device is installed on the exhaust discharge side of the vacuum pump as in the prior art, the corrosive components contained in the exhaust are sucked into the vacuum pump as they are, so the vacuum pump corrodes and the life of the vacuum pump is shortened. There is a risk. In order to suppress the corrosion of the vacuum pump, it may be possible to use a high-grade material having excellent corrosion resistance for the vacuum pump, but the cost becomes high.

The vacuum pump unit of the present invention has been made in view of the above problems, and includes a vacuum pump that sucks the gas from a water collection tank in which a liquid and a gas accompanying and transporting the liquid are collected, the water collection tank, and the vacuum Provided in a communication path communicating with the pump, provided in a removal device for removing corrosive components contained in the gas, and an exhaust path connected to a downstream side of the vacuum pump, and discharged from the vacuum pump. And a deodorizing device for removing odor components contained in the gas.

  In this way, the removal passage (hydrogen sulfide removal device) that removes the corrosive components contained in the gas is provided in the communication passage (transport passage on the gas suction side) that connects the water collection tank and the vacuum pump. The corrosion of the vacuum pump due to the sexual component can be suppressed, and the life of the vacuum pump can be extended.

  The vacuum pump can be a dry type.

  The vacuum pump is a first mode for sucking the gas from the water collection tank, and a pumped gas for pumping the liquid collected in the water collection tank by rotating to the opposite side to the first mode. Can be a vacuum pump that can be operated in the second mode of discharging the water into the water collection tank.

  Moreover, the said removal apparatus can remove the said corrosive component so that the average density | concentration of the hydrogen sulfide contained in the gas from which the said corrosive component was removed will be 20 ppm or less.

  In addition, a bypass conveyance path that bypasses the removal device and connects the upstream communication passage and the downstream communication passage of the removal device among the communication passages, and the upstream communication passage or The downstream communication path is provided with a first check valve that transports the gas only when the vacuum pump is operating in the first mode, and the bypass transport path includes the vacuum A second check valve can be provided that conveys the pressurized gas only when the pump is operating in the second operating mode.

  Further, based on the detected value of the pressure on the suction side of the vacuum pump when the vacuum pump is operating in the first mode, the operation of the first mode of the vacuum pump / the stop of the vacuum pump is performed. A control unit for controlling can be further provided.

  Further, the control unit can control operation of the second mode of the vacuum pump / stop of the vacuum pump based on a detected value of the level of the sewage in the water collection tank.

  The control unit controls opening and closing of a valve provided in a pipe connecting the inside of the housing and the water collection tank based on a detected value of a water level inside the housing that houses the water collection tank. be able to.

  Further, at least one of the communication path for sucking the gas connected to the vacuum pump and the communication path for discharging the gas is provided with a water return pipe for returning the moisture contained in the gas to the water collection tank. be able to.

  The liquid may be sewage containing domestic wastewater.

  Moreover, it can be further provided with a cooling device that is provided in a communication path that communicates the vacuum pump and the deodorizing device, and cools the gas discharged from the vacuum pump.

The vacuum station includes a water collection tank in which a liquid and a gas that carries the liquid are collected, a vacuum pump that sucks the gas from the water collection tank, and a space between the water collection tank and the vacuum pump. Included in the gas discharged from the vacuum pump, provided in the communicating passage, provided in a removal device for removing corrosive components contained in the gas, and an exhaust path connected to the downstream side of the vacuum pump And a deodorizing device for removing odor components.

  Moreover, the vacuum station can bury the water collection tank underground, and can install the vacuum pump, the removal device, and the deodorization device on the ground.

  According to the present invention, since the corrosion of the vacuum pump can be suppressed, the life of the vacuum pump can be extended. Further, according to the present invention, since the hydrogen sulfide removing device is arranged in the intake / exhaust line before the vacuum pump, the deodorizing device attached to the external exhaust line from the vacuum pump can be simplified.

FIG. 1 is a diagram illustrating an overall configuration of a vacuum station according to the first embodiment. FIG. 2 is a diagram illustrating an example of control of the vacuum pump. FIG. 3 is a diagram illustrating an example of control of the vacuum pump. FIG. 4 is a diagram illustrating an example of control of the air release valve. FIG. 5 is a diagram illustrating an overall configuration of a vacuum station according to the second embodiment. FIG. 6 is a diagram illustrating an example of control of the vacuum pump.

  Hereinafter, a vacuum pump unit and a vacuum station according to an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, a vacuum station will be described as an example, but the present invention is not limited to this. For example, the present invention can be applied to a facility that transports a liquid that generates a component that corrodes a vacuum pump by utilizing a gas suction force of the vacuum pump.

<First Embodiment>
FIG. 1 is a diagram illustrating an overall configuration of a vacuum station according to the first embodiment. In the first embodiment, a simple configuration in which one vacuum pump is provided will be described as an example so that the basic configuration and operation of the vacuum station can be easily understood. As shown in FIG. 1, the vacuum station 400 includes a water collection tank unit 200 and a vacuum pump unit 300. The vacuum station of the first embodiment is a road-embedded type in which a water collection tank unit 200 is embedded underground such as in a manhole and a vacuum pump unit 300 is installed on the ground. However, the vacuum valve unit 300 is not limited to the ground, but can also be applied to a case where it is installed underground or under a road. The present invention is not limited to a buried type under the road, and can be applied to, for example, a general vacuum station in which a water collection tank and a vacuum pump are installed in a building on the ground.

  The water collection tank unit 200 includes a water collection tank 202, a check valve unit 204, a sewage water level measuring device 206, a water level measuring device 208, a communication pipe 210, and an atmosphere release valve 212.

  The water collection tank 202 is a container in which sewage containing domestic wastewater and exhaust gas that accompanies and conveys the sewage are collected. One end of a sewage inflow pipe 110 that carries sewage and exhaust gas temporarily stored in, for example, a vacuum valve unit or the like, is connected to the ceiling portion of the water collection tank 202. The check valve unit 204 is provided in the sewage inflow pipe 110. The check valve unit 204 is a valve that allows sewage and exhaust to flow only in the direction from the vacuum valve unit or the like toward the water collection tank 202.

The sewage water level measuring device 206 is a measuring device that measures the sewage water level in the water collection tank 202. The sewage water level measuring device 206 may be an electrode type water level meter, for example. Sewage water level meter 20
6 is output to the control unit 382 provided in the vacuum pump unit 300.

  The water level measuring device 208 is a measuring device that measures the water level in the housing of the water collection tank unit 200. The water level measuring instrument 208 can be, for example, an electrode type water level gauge. The water level measured by the water level measuring device 208 is output to the control unit 382 provided in the vacuum pump unit 300.

  The communication pipe 210 is a pipe that communicates the ceiling portion of the water collection tank 202 with the lower part of the housing of the water collection tank unit 200. The air release valve 212 is provided in the communication pipe 210, and is a valve that opens and closes communication between the ceiling portion of the water collection tank 202 and the lower portion of the water collection tank unit 200.

  In addition, a supply / exhaust pipe 120 that connects the ceiling of the water collection tank 202 and the vacuum pump unit 300 is connected to the ceiling of the water collection tank 202. The air supply / exhaust pipe 120 is a communication path that communicates between the water collection tank 202 and the vacuum pump 314 included in the vacuum pump unit 300. The supply / exhaust pipe 120 is a conveyance path through which the exhaust sucked by the vacuum pump 314 is conveyed.

  In addition, one end of a sewage pressure feed pipe 130 that conveys sewage to, for example, a public facility for sewage treatment, communicates with the bottom of the water collection tank 202. A check valve 214 is provided in the sewage pressure feeding pipe 130. The check valve 214 is a valve that allows sewage to flow only in the direction from the water collection tank 202 to a public facility or the like. In addition, an air vent pipe 140 for venting the air in the sewage pressure feed pipe 130 is branched from the middle of the sewage pressure feed pipe 130. The air vent pipe 140 is provided with an air vent valve 142. The air vent valve 142 can be constituted by a ball valve, for example, and opens and closes the air vent pipe 140.

  Further, the water collection tank unit 200 is provided with an intake pipe 150 that communicates the inside of the housing of the water collection tank unit 200 with the atmosphere. The intake pipe 150 sucks air from the atmosphere into the housing when the inside of the housing of the water collection tank unit 200 becomes negative pressure, and exhausts air from the inside of the housing when the pressure becomes positive.

  Next, the vacuum pump unit 300 will be described. The vacuum pump unit 300 includes a machine room 310 and a control room 380.

  The machine room 310 is provided with a hydrogen sulfide removing device 362 (removing device), a vacuum pump 314, a cooling device 358, a deodorizing device 360, an intake silencer 316, exhaust silencers 318 and 320, an exhaust fan 322, and the like. The vacuum pump 314 is a dry type.

  The control chamber 380 is provided with a control unit 382 that performs rotation control of the vacuum pump 314 and opening / closing control of the atmosphere release valve 212.

  One end of the supply / exhaust pipe 120 is connected to the ceiling of the water collection tank 202, and the other end is connected to the exhaust silencer 318. The supply and exhaust pipe 120 is provided with a hydrogen sulfide removing device 362, a vacuum pump 314, and the like in order from the water collection tank 202 side (upstream side).

  A pressure measuring device 324 is provided on the upstream side of the vacuum pump 314 in the supply / exhaust pipe 120. The pressure measuring device 324 measures the pressure upstream of the vacuum pump 314 of the supply / exhaust pipe 120 including the water collection tank. The pressure value measured by the pressure measuring device 324 is output to the control unit 382.

  The vacuum pump 314 sucks exhaust gas from the water collection tank 202 through the supply / exhaust pipe 120. More specifically, the air supply / exhaust pipe 120 communicates with the ceiling portion (gas phase portion) of the water collection tank 202, and the vacuum pump 314 sucks exhaust gas from the gas phase portion in the water collection tank 202. Thereby, the inside of the water collection tank 202 becomes a negative pressure. As a result, the sewage stored in the vacuum valve unit is transported along with the exhaust gas through the inside of the sewage inflow pipe 110 and stored in the water collection tank 202 via the check valve unit 204.

  In addition, the vacuum pump 314 rotates in the first mode for sucking exhaust gas from the water collection tank 202 and the opposite side to the first mode, so that the gas for pumping the sewage in the water collection tank 202 (hereinafter referred to as the vacuum pump 314). The pump can be operated in the second mode for discharging the gas to the water collection tank 202. In the second mode, the pressurized gas is discharged to the water collection tank 202 through the air supply / exhaust pipe 120, whereby the sewage stored in the water collection tank 202 is discharged from the sewage pressure transmission pipe 130 to, for example, a public facility for sewage treatment. To be pumped.

  For example, when the pressure of the water collection tank 202 falls below a certain value, the vacuum pump 314 operates in the first mode to collect sewage and exhaust into the water collection tank 202, and when sewage is accumulated in the water collection tank 202 to some extent. The operation in the first mode is temporarily stopped and switched to the operation in the second mode. In addition, the vacuum pump 314 temporarily stops the second mode operation when the sewage water level in the water collection tank 202 is lowered by performing the second mode operation, for example, and the pressure of the water collection tank 202 is reduced. When the value falls below a certain value, the operation is switched to the first mode. Further, the vacuum pump 314 stops operation when the pressure of the water collection tank 202 is maintained at a certain value or more, for example, at night.

  The hydrogen sulfide removing device 362 is provided on the inlet side of the vacuum pump 314 and removes corrosive components contained in the exhaust. Here, the corrosive component contained in the exhaust is a component that corrodes the vacuum pump 314, and for example, hydrogen sulfide is representative. Although hydrogen sulfide itself is corrosive, it is changed to highly corrosive sulfuric acid by the action of sulfur-oxidizing bacteria which are aerobic bacteria. The hydrogen sulfide removing device 362 is for removing such corrosive components or causative substances of the corrosive components. The hydrogen sulfide removing device 362 removes corrosive components so that the average concentration of hydrogen sulfide contained in the exhaust gas from the hydrogen sulfide removing device 362 is 20 ppm or less (preferably 10 ppm or less). If it is 20 ppm or less, the problem of corrosion caused by hydrogen sulfide can be suppressed to some extent, but it is not absolute. If it is 10 ppm or less, corrosion caused by hydrogen sulfide can be hardly suppressed. As the hydrogen sulfide removing device 362, for example, a deodorizing device that can be used under a negative pressure, such as a high-concentration odor deodorant used in vacuum cars, garbage, human waste processing plants, or the like can be used. Thereby, even under a negative pressure, the corrosive component can be adsorbed and removed by the hydrogen sulfide removing device 362.

  In addition, valves 326 and 328 are respectively provided in the supply / exhaust pipes 120 on the upstream side (exhaust suction conveyance path) and the downstream side (exhaust discharge conveyance path) of the hydrogen sulfide removing device 362. The valves 326 and 328 are valves that open and close the supply and exhaust pipes 120 on the upstream side and the downstream side of the hydrogen sulfide removing device 362, respectively, and are normally open. For example, the valves 326 and 328 are closed when the hydrogen sulfide removing device 362 is removed for maintenance or replacement.

  Valves 330 and 332 are also provided on the upstream and downstream air supply and exhaust pipes 120 of the vacuum pump 314, respectively. The valves 330 and 332 are valves that open and close the supply and exhaust pipes 120 on the upstream side and the downstream side of the vacuum pump 314, respectively, and are normally open. The valves 330 and 332 are closed when the vacuum pump 314 is removed for maintenance or replacement, for example.

  Further, a bypass pipe 334 (bypass conveyance path) that bypasses and connects the hydrogen sulfide removing device 362 is provided in the supply and exhaust pipes 120 on the upstream side and the downstream side of the hydrogen sulfide removing device 362. The bypass pipe 334 bypasses the hydrogen sulfide removing device 362 and connects the upstream and downstream communication passages of the hydrogen sulfide removing device 362 in the supply / exhaust pipe 120. The bypass pipe 334 is provided with a check valve 336 (second check valve) that conveys the pressurized gas when the vacuum pump 314 is operating in the second operation mode (pressure feeding mode). In addition, the exhaust gas is conveyed to the upstream supply / exhaust pipe 120 (upstream communication path) of the hydrogen sulfide removing device 362 only when the vacuum pump 314 is operating in the first mode (water collection mode). A check valve 338 (first check valve) is provided. The check valve 338 may be provided in the supply / exhaust pipe 120 (downstream communication path) on the downstream side of the hydrogen sulfide removing device 362.

  As described above, by providing the bypass pipe 334 and the check valves 336 and 338, when the vacuum pump 314 is operating in the first mode (water collection mode), the exhaust gas does not pass through the bypass pipe 334 and is sulfided. It is sucked into the vacuum pump 314 through the hydrogen removing device 362. On the other hand, when the vacuum pump 314 is operating in the second mode (pressure feed mode), the pumped gas is pumped to the water collection tank 202 through the bypass pipe 334 without passing through the hydrogen sulfide removing device 362. Therefore, it is possible to suppress the backflow of the pumped gas to the hydrogen sulfide removing device 362 during the pumping mode.

  The bypass pipe 334 and the supply / exhaust pipe 120 on the upstream side of the hydrogen sulfide removing device 362 are connected by a pipe 340, and a valve 342 is provided in the pipe 340. The valve 342 is a valve that opens and closes the pipe 340. The pipe 340 is used, for example, when the hydrogen sulfide removing device 362 is maintained or replaced. That is, the valve 342 is normally closed, but is opened when the hydrogen sulfide removing device 362 is removed for maintenance or replacement. When the hydrogen sulfide removing device 362 is removed, the exhaust gas is sucked into the vacuum pump 314 through the pipe 340 and the bypass pipe 334.

  A cooling device 358 and a deodorizing device 360 are provided in the external exhaust line of the supply / exhaust pipe 120 downstream of the vacuum pump 314. In addition, the cooling device 358 is provided in a communication path in the supply / exhaust pipe 120 that connects the vacuum pump 314 and the deodorizing device 360. In other words, the hydrogen sulfide removing device 362 provided on the upstream side of the vacuum pump 314 removes corrosive components (such as hydrogen sulfide) of the vacuum pump 314 contained in the exhaust gas, and at the downstream side of the vacuum pump 314 (exhaust discharge communication passage). Although the example which removes the odor component contained in exhaust_gas | exhaustion by the deodorizing apparatus 360 provided in) was shown, it is not restricted to this.

  In the first embodiment, the hydrogen sulfide removing device 362 provided on the upstream side of the vacuum pump 314 may be any device that can remove corrosive components (such as hydrogen sulfide) of the vacuum pump 314 included in the exhaust. For example, the hydrogen sulfide removing device 362 only needs to remove the corrosive component so that the average concentration of hydrogen sulfide contained in the exhaust gas from which the corrosive component has been removed is 20 ppm or less (preferably 10 ppm or less). On the other hand, odor components contained in the exhaust gas can be removed by a deodorizing device 360 provided in an external exhaust line downstream of the vacuum pump 314. After the exhaust gas whose temperature has been raised by the vacuum pump 314 is cooled to a predetermined temperature by the cooling device 358, the concentration of hydrogen sulfide, for example, of the odor components supplied to the deodorizing device 360 and contained in the exhaust gas is 0.2 ppm or less (preferably 0. 0. 1 ppm or less, more preferably 0.02 ppm or less). Note that 0.2 ppm corresponds to the upper limit value of the rule standard on the surface of the site boundary line and corresponds to an odor intensity of 3.5, and 0.02 ppm corresponds to the lower limit value of the rule standard and corresponds to an odor intensity of 2.5.

The exhaust silencer 318 suppresses the sound generated when the exhaust is discharged to the outside of the vacuum pump unit 300 during the water collection mode, and sucks the pumped gas from the outside of the vacuum pump unit 300 during the pumping mode. This suppresses the sound that occurs when the sound flows out.

  The exhaust fan 322 is a fan for releasing the heat inside the vacuum pump unit 300 to the outside. When the exhaust fan 322 is operated, air is sucked from the outside of the vacuum pump unit 300 through the intake silencer 316 and discharged to the outside of the vacuum pump unit 300 through the exhaust silencer 320. Thereby, the temperature of the machine (for example, vacuum pump 314 etc.) which generates heat can be lowered.

  The intake silencer 316 suppresses sound generated when air is sucked from the outside of the vacuum pump unit 300. Further, the exhaust silencer 320 suppresses a sound generated when the air is exhausted to the outside of the vacuum pump unit 300.

  Further, as shown in FIG. 1, the water contained in the exhaust gas is supplied to the water collection tank 202 in the supply / exhaust pipes 120 on the upstream side (exhaust suction communication passage) and the downstream side (exhaust discharge communication passage) of the vacuum pump 314. Return pipes 344 and 346 for returning are provided. Valves 348 and 350 are provided on the return pipes 344 and 346, respectively. The valves 348 and 350 are valves that open and close the water return pipes 344 and 346, respectively, and are appropriately controlled to open and close. By providing the water return pipes 344 and 346, the moisture contained in the exhaust is returned to the water collection tank 202, so that the occurrence of failure of the vacuum pump 314 due to the moisture being sucked into the vacuum pump 314 is suppressed. be able to.

  Next, the control unit 382 will be described. As shown in FIG. 1, the control unit 382 receives the water level measured by the sewage water level measuring device 206, the water level measured by the water level measuring device 208, and the pressure value measured by the pressure measuring device 324. The control unit 382 controls the rotation control of the vacuum pump 314 and the opening / closing of the air release valve 212 based on the input water level value and pressure value.

  Hereinafter, a specific control example of the control unit 382 will be described. First, FIG. 2 is a diagram illustrating an example of control of the vacuum pump. The control unit 382 controls the operation / stop of the first mode of the vacuum pump 314 based on the detected value of the pressure on the suction side of the vacuum pump 314 when the vacuum pump 314 is operating in the first mode. .

  Specifically, as shown in FIG. 2, when the pressure value measured by the pressure measuring device 324 becomes lower than the first threshold value (LP), the control unit 382 rotates the vacuum pump 314 (forward rotation). Direction rotation). Further, when the pressure value measured by the pressure measuring device 324 becomes higher than the second threshold value (HP) set higher than the first threshold value, the control unit 382 moves the vacuum pump 314 in the normal rotation direction. Rotate in the direction of water collection mode. Further, the control unit 382 issues an alarm when the pressure value measured by the pressure measuring device 324 becomes higher than a third threshold value (HHP) set higher than the second threshold value. On the other hand, the control unit 382 resets the alarm when the pressure value measured by the pressure measuring device 324 becomes lower than the second threshold (HP) in a state where the alarm is issued. By the above control, the water collection tank 202 is controlled to an appropriate negative pressure in the water collection mode.

  Next, FIG. 3 is a diagram illustrating an example of control of the vacuum pump. The control unit 382 controls the operation of the vacuum pump 314 in the second mode / stop of the vacuum pump based on the detected value of the sewage level of the water collection tank 202.

Specifically, as shown in FIG. 3, when the water level measured by the sewage water level measuring device 206 becomes lower than the first threshold value (LWL), the control unit 382 rotates the vacuum pump 314 (reverse direction). Stop rotating). Further, when the water level measured by the sewage water level measuring device 206 becomes higher than the second threshold value (HWL) set higher than the first threshold value, the control unit 382 turns the vacuum pump 314 in the reverse rotation direction ( Rotate in the direction of rotation in the pressure feed mode. Further, the control unit 382 issues an alarm when the water level measured by the sewage water level measuring device 206 becomes higher than the third threshold value (HHWL) set higher than the second threshold value. On the other hand, the control unit 382 resets the alarm when the water level measured by the sewage water level measuring device 206 is lower than the second threshold value (HWL) in a state where the alarm is issued. Through the control described above, the sewage stored in the water collection tank 202 is appropriately pumped.

  Next, the air release valve 212 is controlled so that the pressure in the water collection tank 202 is returned to the atmospheric pressure when the vacuum pump 314 is switched from the first mode to the second mode and from the second mode to the first mode. However, as another application, control as shown in FIG. 4 can be performed. Based on the detected value of the water level inside the housing that houses the water collection tank 202, the control unit 382 opens and closes the air release valve 212 provided in the communication pipe 210 that connects the inside of the housing and the water collection tank 202. Control.

  Specifically, as shown in FIG. 4, the control unit 382 closes the atmosphere release valve 212 when the water level measured by the water level measuring device 208 becomes lower than the first threshold value (LWL). The control unit 382 opens the atmosphere release valve 212 when the water level measured by the water level measuring instrument 208 becomes higher than the second threshold value (HWL) set higher than the first threshold value. . Further, when the water level measured by the water level measuring instrument 208 becomes higher than the third threshold value (HHWL) set higher than the second threshold value, the control unit 382 generates a leak from outside the housing. Because there is a possibility that it is, it will issue an alarm. On the other hand, the control unit 382 resets the alarm when the water level measured by the water level measuring device 208 becomes lower than the second threshold (HWL) in a state where the alarm is issued. When water has accumulated to some extent in the housing of the water collection tank unit 200 by the control as described above, the air release valve 212 is opened, and as a result, the water in the housing is conveyed into the negative pressure water collection tank 202. The

  As described above, the vacuum station 100 according to the first embodiment removes the corrosive gas components in the exhaust gas collected in the water collection tank 202 by the hydrogen sulfide removing device 362 installed in front of the vacuum pump 314. Thereby, since the corrosive gas component contained in the exhaust gas can be removed before the vacuum pump 314, the corrosion of the vacuum pump 314 can be suppressed, and the life of the vacuum pump 314 can be extended. Further, since the vacuum pump 314 need not be made of a material having excellent corrosion resistance, the cost of the vacuum pump 314 can be suppressed.

  Here, in the first embodiment, the vacuum pump 314 capable of forward rotation and reverse rotation is used. In a vacuum pump that can rotate in the forward and reverse directions, corrosion due to corrosive components is a particular problem. As in the first embodiment, a hydrogen sulfide removing device 362 is provided upstream of the vacuum pump 314 during forward rotation. This is preferable because corrosion of the vacuum pump 314 can be suppressed.

  Further, by removing corrosive components such as hydrogen sulfide on the exhaust suction side (upstream side) of the vacuum pump 314, a part of the odor component contained in the exhaust can be removed on the upstream side of the vacuum pump 314. Therefore, the deodorizing device provided on the exhaust discharge side (downstream side) of the vacuum pump 314 can have a smaller capacity.

Second Embodiment
Next, the vacuum station of 2nd Embodiment is demonstrated. The second embodiment is different from the first embodiment in that three vacuum pumps are provided in parallel, the sewage water level in the water collection tank 202 is detected in two systems, and the pressure in the water collection tank 202 is The point of detection by two systems is different. Therefore, in the second embodiment, only portions different from the first embodiment will be described, and description of overlapping portions will be omitted.

  FIG. 5 is a diagram illustrating an overall configuration of a vacuum station according to the second embodiment. As illustrated, in the vacuum station 600, in addition to the sewage water level measuring device 206, a sewage water level measuring device 216 for detecting the water level of the sewage in the water collecting tank 202 is provided. The sewage water level meter 216 can be, for example, a conductivity type water level gauge. The water level measured by the sewage water level measuring devices 206 and 216 is output to the switching circuit 384 provided in the control chamber 380 of the vacuum pump unit 300. The switching circuit 384 outputs one of the two input detection water levels to the control unit 382. According to the second embodiment, since the water level in the water collection tank 202 is detected by two systems, the reliability of the water level detection in the water collection tank 202 is improved.

  Further, in the vacuum station 600, in addition to the pressure measuring device 324, a pressure measuring device 325 for measuring the pressure upstream of the vacuum pump 314 of the air supply / exhaust pipe 120 is provided. The pressure value measured by the pressure measuring devices 324 and 325 is output to the switching circuit 386 provided in the control chamber 380 of the vacuum pump unit 300. The switching circuit 386 outputs one of the two detected detection pressures to the control unit 382. According to the second embodiment, since the pressure upstream of the vacuum pump 314 of the air supply / exhaust pipe 120 is detected by two systems, the reliability of pressure detection in the water collection tank 202 is improved.

  In the vacuum station 600, two vacuum pumps 351 and 352 are provided in addition to the vacuum pump 314. Valves 353 and 354 are provided in the supply and exhaust pipes 120 on the upstream side and the downstream side of the vacuum pump 351, respectively. The valves 353 and 354 are valves that open and close the supply and exhaust pipes 120 on the upstream side and the downstream side of the vacuum pump 351, respectively, and are normally open. For example, the valves 353 and 354 are closed when the vacuum pump 351 is removed for maintenance or replacement.

  Valves 355 and 356 are provided on the upstream and downstream air supply and exhaust pipes 120 of the vacuum pump 352, respectively. The valves 355 and 356 are valves that open and close the supply and exhaust pipes 120 on the upstream side and the downstream side of the vacuum pump 352, respectively, and are normally open. The valves 355 and 356 are closed when, for example, the vacuum pump 352 is removed for maintenance or replacement.

  The three vacuum pumps 314, 351, and 352 are connected in parallel. In the vacuum station 600, two of the three vacuum pumps 314, 351, and 352 are normally used, and one is for backup. According to the second embodiment, by connecting a plurality of vacuum pumps in parallel and providing a backup vacuum pump, the operation can be quickly restored in the event of a vacuum pump failure or the like. Reliability can be improved.

  Note that by providing a plurality of vacuum pumps as in the second embodiment, the temperature inside the machine chamber 310 of the vacuum pump unit 300 is likely to rise. In this regard, in the second embodiment, more exhaust fans 322 are provided than in the first embodiment. Thereby, since the air flowing through the machine room 310 can be increased, the heat radiation amount in the machine room 310 can be increased, and the inside of the machine room 310 can be controlled to an appropriate temperature.

  Moreover, in 2nd Embodiment, rotation control of the vacuum pump by the control part 382 differs from 1st Embodiment by using two vacuum pumps simultaneously. Hereinafter, this point will be described.

  FIG. 6 is a diagram illustrating an example of control of the vacuum pump. Based on the detected pressure value on the suction side of the vacuum pump when the two vacuum pumps are operating in the first mode, the control unit 382 operates / vacuums the first mode of the two vacuum pumps. Controls pump stop.

  Specifically, as illustrated in FIG. 6, the control unit 382 determines that the pressure value measured by the pressure measuring device 324 or the pressure measuring device 325 is lower than a first threshold value (for example, −70.0 kPa). Stop rotation of both vacuum pumps (forward rotation). Further, the control unit 382 causes the pressure value measured by the pressure measuring device 324 or the pressure measuring device 325 to be higher than a second threshold value (for example, −65.0 kPa) set higher than the first threshold value. Then, the first vacuum pump is rotated in the forward rotation direction (the rotation direction of the water collection mode) and the second vacuum pump is kept stopped. In addition, the control unit 382 causes the pressure value measured by the pressure measuring device 324 or the pressure measuring device 325 to be higher than a third threshold value (for example, −60.0 kPa) set higher than the second threshold value. Then, the second vacuum pump is also rotated in the normal rotation direction (the rotation direction of the water collection mode). Further, the control unit 382 causes the pressure value measured by the pressure measuring device 324 or the pressure measuring device 325 to be higher than a fourth threshold value (for example, −50.0 kPa) set higher than the third threshold value. If so, issue an alarm. On the other hand, the control unit 382 has a pressure value measured by the pressure measuring device 324 or the pressure measuring device 325 lower than a third threshold value (for example, −60.0 kPa) in a state where an alarm is issued. If so, reset the alarm. By the above control, the water collection tank 202 is controlled to an appropriate negative pressure in the water collection mode.

  According to the second embodiment, as in the first embodiment, the corrosive components contained in the exhaust gas are removed on the upstream side of the vacuum pumps 314, 351, and 352, so that the corrosion of the vacuum pumps 314, 351, and 352 is suppressed. The life of the vacuum pumps 314, 351, and 352 can be extended. Further, since the vacuum pumps 314, 351, and 352 do not have to be made of a high-grade material having excellent corrosion resistance, the costs of the vacuum pumps 314, 351, and 352 can be suppressed.

120 Water Supply / Exhaust Pipe 200 Water Collection Tank Unit 202 Water Collection Tank 206 Sewage Water Level Measuring Device 208 Water Level Measuring Device 210 Communication Pipe 212 Air Release Valve 300 Vacuum Pump Unit 314, 351, 352 Vacuum Pump 334 Bypass Pipe 336, 338 Check Valve 358 Cooling device 360 Deodorizing device 362 Hydrogen sulfide removing device 382 Control unit 400, 600 Vacuum station

Claims (13)

A vacuum pump for sucking the gas from a water collection tank in which the liquid and the gas accompanying and transporting the liquid are collected;
A removal device that is provided in a communication path that communicates between the water collection tank and the vacuum pump, and removes corrosive components contained in the gas;
A deodorizing device that is provided in an exhaust passage connected to the downstream side of the vacuum pump and removes odor components contained in the gas discharged from the vacuum pump;
With vacuum pump unit. The vacuum pump unit according to claim 1,
The vacuum pump is a dry type.
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 1,
The vacuum pump has a first mode for sucking the gas from the water collection tank, and a pumping gas for pumping the liquid collected in the water collection tank by rotating to the opposite side to the first mode. It is a vacuum pump that can be operated in a second mode for discharging to a water collection tank.
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 1,
The removing device removes the corrosive component so that an average concentration of hydrogen sulfide contained in the gas from which the corrosive component has been removed is 20 ppm or less.
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 3,
A bypass conveyance path that bypasses and connects the removal passage between the communication passage on the upstream side of the removal device and the communication passage on the downstream side of the removal device;
The upstream communication passage or the downstream communication passage is provided with a first check valve that conveys the gas only when the vacuum pump is operating in the first mode,
The bypass conveyance path is provided with a second check valve that conveys the pressurized gas only when the vacuum pump is operating in the second operation mode.
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 3,
Based on the detected value of the pressure on the suction side of the vacuum pump when the vacuum pump is operating in the first mode, the operation of the first mode of the vacuum pump / the stop of the vacuum pump is controlled. A control unit;
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 6,
The said control part controls operation | movement of the 2nd mode of the said vacuum pump / stop of the said vacuum pump based on the detected value of the said sewage water level of the said water collection tank. The vacuum pump unit characterized by the above-mentioned. The vacuum pump unit according to claim 6,
The control unit controls opening and closing of a valve provided in a pipe connecting the inside of the housing and the water collection tank based on a detection value of a water level inside the housing that houses the water collection tank. A featured vacuum pump unit. The vacuum pump unit according to claim 1,
At least one of the communication path for sucking the gas connected to the vacuum pump and the communication path for discharging the gas is provided with a water return pipe for returning moisture contained in the gas to the water collection tank. A vacuum pump unit characterized by The vacuum pump unit according to claim 1,
The liquid is sewage containing domestic wastewater,
A vacuum pump unit characterized by that. The vacuum pump unit according to claim 1,
A cooling device that is provided in a communication path that connects the vacuum pump and the deodorizing device, and that cools the gas discharged from the vacuum pump;
A vacuum pump unit characterized by that. A water collection tank in which a liquid and a gas accompanying and transporting the liquid are collected;
A vacuum pump for sucking the gas from the water collection tank;
A removal device that is provided in a communication path that communicates between the water collection tank and the vacuum pump, and removes corrosive components contained in the gas;
A deodorizing device that is provided in an exhaust passage connected to the downstream side of the vacuum pump and removes odor components contained in the gas discharged from the vacuum pump;
With a vacuum station. The water collection tank is buried underground,
The vacuum station according to claim 12, wherein the vacuum pump, the removing device, and the deodorizing device are installed on the ground or underground.

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