JP6305841B2 - Lift loss reduction device and lift loss reduction method - Google Patents

Description

  The present invention relates to a lift loss reduction device and a lift loss reduction method applied to a vacuum valve unit or the like of a vacuum type sewage collection system.

  Conventionally, a vacuum sewage collection system has been used as a sewer system for efficiently collecting sewage from a home. The vacuum-type sewage collection system collects sewage by utilizing the difference from the atmospheric pressure by keeping the inside of the pipeline at a negative pressure. FIG. 2 is a diagram showing the overall configuration of the vacuum sewage collection system. The vacuum-type sewage collection system 60 is installed in each household H (桝) 61, a vacuum valve unit 62, a vacuum station 63, and a pipe connected between the private 61 and the vacuum valve unit 62. 64 and a vacuum line 65 connected between the vacuum valve unit 62 and the vacuum station 63. Many of the elements constituting the vacuum sewage collection system 60 are used in the form of being buried underground.

  Private private 61 temporarily stores the sewage discharged from each household H. The vacuum valve unit 62 is connected to a plurality of private pipes 61 via pipe lines 64 laid in branches. By opening the vacuum valve 621 provided in the vacuum valve unit 62, the sewage collected by the natural flow method from each private unit 61 is sucked into the vacuum line 65. The inside of the vacuum line 65 is always kept in vacuum, and the sewage sucked from the vacuum valve unit 62 is conveyed to the vacuum station 63. The vacuum station 63 is connected to a plurality of vacuum valve units 62 through vacuum pipes 65 laid in a branch shape. The vacuum station 63 collects sewage through the vacuum line 65 by generating a vacuum. The vacuum station 63 pumps the collected sewage to a treatment plant or a public sewer main line.

  The vacuum station 63 includes a vacuum pump 631 and a water collection tank 632. The vacuum pump 631 is normally operated so that the degree of vacuum in the water collection tank 632 is −6 mAq to −7 mAq. The “vacuum degree” used here means a gauge pressure. Accordingly, the atmospheric pressure is 0 mAq, and the absolute vacuum is -10.33 mAq. The meaning of the term “vacuum” used in the present application will be described later.

  On the other hand, the degree of vacuum required to open and close the vacuum valve 621 of the vacuum valve unit 62, that is, the pressure required to suck the sewage collected from the private 61 into the vacuum line 65 is about -2.5 mAq. Even when the degree of vacuum is the lowest, that is, -6 mAq, in order for the vacuum valve 621 at the end of the vacuum line to open and close, the pressure loss in the middle of the vacuum line 65 may be within 3.5 mAq. is necessary.

  There are two types of pressure loss in the vacuum line: a loss in a static state (no flow) and a loss in a dynamic state (a state when the design sewage is flowing). Therefore, it is necessary that the loss in both states is within the allowable loss (3.5 mAq). That is, the loss in a static state (= sum of static lift loss) and the loss in a dynamic state (= sum of dynamic lift loss + sum of friction loss) must be 3.5 mAq or less, respectively. .

  Here, the static lift loss is a loss head when there is no flow of sewage and the lift (climbing slope) is full, and is obtained from [lift height−pipe inner diameter]. The dynamic lift loss is a lift loss head when the design sewage amount is flowing, and is obtained by [lift height × 0.5].

  When the vacuum pipe 65 crosses an obstacle such as the water channel C, as shown in FIG. 1, the vacuum pipe 65 needs to pass over the obstacle or pass under the obstacle. In any case, a large lift loss is caused in order to raise the sewage at the climbing slope. When the obstacle is a water channel, the lift height is, for example, 1.2 m to 1.5 m. When there are a plurality of such obstacles, the water head is greatly consumed to cross all the obstacles, and the sewage collection range of the vacuum sewage collection system 60 becomes narrow.

  In order to solve this problem, the following lift loss prevention device has been proposed (see Patent Document 1). FIG. 3 is a diagram showing a configuration of a conventional lift loss prevention device. The lift loss prevention device 70 includes an upstream vacuum sewage pipe 73, a downstream vacuum sewage pipe 76 installed at a position higher than the upstream vacuum sewage pipe 73, and an end of the upstream vacuum sewage pipe 73. A water collection tank 72 connected to the water collection tank 72, a sewage passage outflow pipe 75 and a gas passage vent pipe 77 connected between the water collection tank 72 and the downstream vacuum sewage pipe 76, and a water collection tank 72. An air intake pipe 78 that connects to the outside air, and switching valves 79-1 and 79-2 that switch so that one of the ventilation pipe 77 and the air intake pipe 78 is opened and the other is closed are provided. Yes.

  In this lift loss prevention device, when a predetermined amount of sewage accumulates in the water collection tank 72, the vent pipe 77 is closed by the switching valves 79-1 and 79-2 and the air intake pipe 78 is opened to enter the water collection tank 72. The outside air flows in, and the sewage in the water collection tank 72 is pushed up to the downstream vacuum sewage 76 through the outflow pipe 75 due to the difference between the vacuum pressure in the vacuum sewage pipe 76 on the downstream side and the atmospheric pressure in the water collection tank 72. . Therefore, although the height difference from the downstream vacuum sewage pipe 76 installed at a position higher than the upstream vacuum sewage pipe 73 is essentially lift loss, by providing the ventilation pipe 77 in addition to the outflow pipe 75, Since the vacuum pressure downstream from the lift is always transmitted upstream from the lift, the lift loss is zero.

Japanese Patent No. 3370830

  However, the lift loss prevention device described in Patent Document 1 has a problem that it becomes inoperable when submerged because the switching valve is electrically operated. An object of the present invention is to provide a novel lift loss reduction device that is advantageous in reducing lift loss and realizing a wide sewage collection range.

  One aspect of the present invention is a lift loss reducing device that feeds liquid flowing in from an upstream vacuum conduit to a downstream vacuum conduit installed at a position higher than the upstream vacuum conduit, the lift loss reducing device. A water collection tank for storing liquid flowing in from the upstream vacuum line, a suction pipe having one end arranged in the water collection tank and the other end connected to the downstream vacuum line, and the collection line It is taken out by an air release valve that communicates the water tank to the atmosphere, an upper pressure outlet that extracts the upper pressure of the water collection tank, a lower pressure outlet that extracts the lower pressure of the water collection tank, and the upper pressure outlet. And a controller that opens the atmosphere release valve according to the difference between the pressure taken out and the pressure taken out by the lower pressure outlet.

  With this configuration, the atmospheric pressure release valve that brings the water collection tank to atmospheric pressure in order to send the liquid in the water collection tank to the downstream vacuum line higher than the upstream side vacuum line, and the upper pressure in the water collection tank The controller can be activated and opened by the difference between the lower pressure and the lower pressure, thereby introducing atmospheric pressure into the water collection tank, so that the liquid in the water collection tank is pushed from one end of the suction pipe to the other Can flow to the side vacuum line.

  In the above-described lift loss reducing device, the upper pressure outlet may take out an upper pressure in the water collection tank, and the lower pressure outlet may be a liquid level of the liquid stored in the water collection tank. The pressure may be taken out.

  With this configuration, when the liquid level in the water collection tank reaches a predetermined value or more, the pressure taken out from the lower pressure outlet becomes sufficiently larger than the pressure taken out from the upper pressure outlet, and the controller operates to open the air release valve. Can be opened.

  In the above-described lift loss reducing device, the lower pressure outlet may be provided at a position higher than one end of the suction pipe.

  With this configuration, when the liquid is collected in the water collecting tank to a level at which only the liquid can be sucked from at least one end of the suction pipe, the pressure taken out from the upper pressure outlet and the pressure taken out from the lower pressure outlet When the controller is activated and the air release valve can be opened and there is little liquid in the water collection tank and it is below the lower end level of the suction pipe, the pressure taken out from the upper pressure outlet There is no difference between the pressure taken out from the lower pressure outlet and the controller does not operate and the atmosphere release valve is not opened.

  In the above-described lift loss reducing device, the suction pipe is provided with a lower differential pressure outlet for extracting the lower pressure of the suction pipe at a predetermined interval in the vertical direction and an upper differential pressure outlet for extracting the upper pressure of the suction pipe. The controller may open and close the atmosphere release valve according to a difference between a pressure taken out by the lower differential pressure outlet and a pressure taken out by the upper differential pressure outlet.

  With this configuration, when the amount of liquid in the water collection tank decreases and the gas in the water collection tank is sucked into the suction pipe, the difference between the upper part and the lower part of the suction pipe is reduced or eliminated. Can close the air release valve.

  The lift loss reducing device may further include a ventilation cutoff valve connected to the water collection tank and connected to the downstream vacuum line via a gas passage ventilation pipe.

  With this configuration, it is possible to cause the liquid to flow into the water collection tank from the upstream vacuum line by evacuating the water collection tank.

  In the lift loss reducing device described above, the ventilation shut-off valve may be closed when the inside of the water collection tank is at atmospheric pressure, and may be opened when the inside of the water collection tank is evacuated.

  With this configuration, when the air release valve is opened and the water collection tank is at atmospheric pressure, ventilation for allowing liquid to flow from the upstream vacuum tube into the water collection tank is blocked. That is, when the air release valve is opened, the ventilation cutoff valve can be closed accordingly.

  Another aspect of the present invention is a lift loss reduction method for supplying water flowing from an upstream vacuum pipe to a downstream vacuum pipe installed at a position higher than the upstream vacuum pipe, and this lift loss reduction. In the method, the liquid flowing in from the upstream vacuum line is stored in a water collection tank, and a controller is activated by the difference between the upper pressure of the water collection tank and the lower pressure of the water collection tank, and the water collection tank is brought to the atmosphere. Open the communicating atmosphere release valve, thereby sucking the liquid in the water collection tank by the suction pipe connected at one end to the water collection tank and the other end to the downstream vacuum line. It has the structure which flows into the side vacuum pipe line.

  With this configuration, an air release valve that brings the water collection tank to atmospheric pressure in order to send the liquid in the water collection tank to the downstream vacuum line higher than the upstream side vacuum line, and the upper pressure in the water collection tank The controller can be opened by operating the difference between the lower pressure and the lower pressure, thereby introducing the atmospheric pressure into the water collection tank, so that the liquid in the water collection tank is pushed from one end of the suction pipe to the other Can flow to the side vacuum line.

  According to the present invention, the air release valve for bringing the inside of the water collection tank to atmospheric pressure in order to send the liquid in the water collection tank to the downstream side vacuum pipe located higher than the upstream side vacuum pipe, The controller can be activated and opened by the difference between the upper pressure and the lower pressure, which introduces atmospheric pressure into the water collection tank, so the liquid in the water collection tank is pushed out from one end of the suction pipe to the other end , Can flow to the upstream vacuum line.

The figure which shows the structure of the lift loss reduction apparatus in embodiment of this invention. Diagram showing the overall configuration of the vacuum sewage collection system The figure which shows the structure of the conventional lift loss prevention apparatus

  Hereinafter, a lift loss reducing device according to an embodiment of the present invention will be described with reference to the drawings. The embodiment described below shows an example when the present invention is implemented, and the present invention is not limited to the specific configuration described below. In carrying out the present invention, a specific configuration according to the embodiment may be adopted as appropriate. In the present application, the term “vacuum” is not limited to a state in which no gas exists in a certain space, but includes a state in which a certain space is lower than the atmospheric pressure. “To make” means to make the space a pressure lower than the atmospheric pressure (negative pressure).

  FIG. 1 is a diagram showing a configuration of a lift loss reducing apparatus according to an embodiment of the present invention. The lift loss reduction device 100 of the present embodiment is applied to a vacuum valve unit (see FIG. 2) of a sewage collection system for collecting sewage (sewage) from a home. The lift loss reducing apparatus 100 is embedded in a building 32 provided underground. The interior of the building 32 is at atmospheric pressure because it communicates with the air on the ground through the air intake pipe 14. The building 32 may be a manhole.

  The lift loss reducing device 100 includes a water collection tank 7, a suction pipe 3 for passing sewage connected between the water collection tank 7 and the downstream vacuum line 10, and an open air connection that connects the water collection tank 7 to the atmosphere. A valve 9, a controller 1 that switches the opening / closing operation of the atmosphere release valve 9, and a ventilation cutoff valve 13 that communicates the water collection tank 7 with a gas passage ventilation pipe 11 are provided. An upstream vacuum line 6 is connected to the water collection tank 7, and a downstream side vacuum line 10 installed at a position higher than the upstream side vacuum line 6 is connected via the suction pipe 3.

  The upstream-side vacuum pipe line 6 is buried at a normal embedding depth, and is connected to, for example, private houses in a plurality of households. A pipe check valve 5 is attached in the vicinity of the water collection tank 7 in the upstream vacuum pipe 6. The pipe check valve 5 is opened when sewage or gas flows in the upstream vacuum pipe 6 from the upstream toward the water collection tank 7 and is closed when sewage or gas flows in the reverse direction. It has become. The pipe check valve 5 may not be provided in the upstream vacuum pipe 6 but a flap valve may be provided on the end face of the upstream vacuum pipe 6 (in the water collection tank 7).

  The water collection tank 7 is installed in a building 32 provided in the ground. Connected to the water collection tank 7 are an upstream-side vacuum pipe 6, a suction pipe 3, an atmosphere release valve 9, a ventilation cutoff valve 13, and an atmosphere suction pipe 19. Further, in order to transmit the pressure difference between the upper and lower parts in the water collection tank 7 to the controller 1, a lower pressure outlet 15 and an upper pressure outlet 16 are connected to the lower and upper parts of the water collection tank 7, respectively. Yes. The lower pressure outlet 15 is provided at a position above the lower end 3 a of the suction pipe 3. The pressure outlets 15 and 16 are connected to the controller 1 via pressure guiding tubes 20 and 21, respectively. Further, the vacuum accumulator tank 2 is connected to the water collection tank 7 via a pressure guiding pipe 25, and the vacuum pressure accumulating tank 2 is connected to the controller 1 via a pressure guiding pipe 24.

  The downstream side vacuum pipe 10 is installed in the vicinity of the ground surface so as to straddle the obstacle C such as a water channel. Although the maximum value of the height difference h1 with respect to the downstream side vacuum line 10 installed at a position higher than the upstream side vacuum line 6 is originally a lift loss, as will be described later, by providing the ventilation pipe 11, Since the side vacuum pressure is always transmitted to the upstream side, the lift loss is zero.

  One end of the gas passage vent pipe 11 is connected to the vent shut-off valve 13, and the other end is connected to the merging tank 12 like the downstream vacuum pipe 10. The merging tank 12 is connected to a vacuum station (see FIG. 2). The vacuum pressure generated by the vacuum pump in the vacuum station is transmitted to the water collection tank 7 via the merging tank 12, the downstream side vacuum pipe 10, and the suction pipe 3 to suck up the sewage. The water collection tank 7 is transmitted to the water collection tank 7 to keep the water collection tank 7 in a vacuum.

  The suction pipe 3 is provided with a lower differential pressure outlet 17 and an upper differential pressure outlet 18 with a space in the vertical direction. The lower differential pressure outlet 17 and the upper differential pressure outlet 18 are connected to the controller 1 via pressure guiding tubes 22 and 23, respectively. Further, a simultaneous air suction pipe 8 is branched in the middle of the suction pipe 3, and its tip is opened in the water collection tank 7.

  The air release valve 9 houses a diaphragm 94 and a spring 93 for urging the diaphragm 94 in a piston chamber 95, and includes a valve body 91 fixed to the diaphragm 94. When the internal pressure of the piston chamber 95 is atmospheric pressure, the valve body 91 closes the connection port 71 of the water collection tank 7 as shown in FIG. When the pressure in the piston chamber 95 decreases and the diaphragm 94 rises against the elastic force of the spring 93, the valve body 91 is lifted by the diaphragm 94 and rises, and the connection port 71 of the water collection tank 7 and the air release valve Nine atmosphere ports 92 communicate with each other. Thereby, the inside of the water collection tank 7 becomes atmospheric pressure.

  The ventilation shut-off valve 13 has the same structure as the air release valve 9. A diaphragm 134 and a spring 133 that biases the diaphragm 134 are housed in the piston chamber 135, and a valve body 131 fixed to the diaphragm 134 is accommodated. I have. When the internal pressure of the piston chamber 135 is atmospheric pressure, the spring 133 urges the diaphragm 134 and the valve body 131 closes the connection port 72 of the water collection tank 7. When the internal pressure of the piston chamber 135 decreases and the diaphragm 134 rises against the elastic force of the spring 133, the valve body 131 is lifted by the diaphragm 134 and rises as shown in FIG. The port 72 and the vent pipe 11 connected to the connection port 132 are communicated with each other.

  An atmospheric suction pipe 19 is connected between the water collection tank 7 and the ventilation cutoff valve 13. The air release valve 9 and the ventilation cutoff valve 13 are configured such that when one is opened, the other is closed. When the air release valve 9 is opened and the water collection tank 7 is at atmospheric pressure, the ventilation shutoff valve 13 is closed via the air suction pipe 19. By closing the ventilation shutoff valve 13, the gas in the water collection tank 7 does not flow to the ventilation pipe 11.

  The controller 1 is provided with a partition wall 104 penetrating the shaft 103 in the casing 101 and is divided into left and right chambers, and the left chamber is divided into a chamber A and a chamber B by a sensor diaphragm 105, and the right chamber is a diaphragm. 106 is divided into a C room and a D room. The right end portion of the casing 101 is divided into an E chamber and an F chamber by partition walls 107 and 108.

  The valve body 102 fixed to the tip of the shaft 103 is disposed in the F chamber, and the rear end of the shaft 103 is fixed (or abutted) to the center portion of the sensor diaphragm 105. The shaft 103 passes through the partition wall 104, and a diaphragm 106 is inserted (the diaphragm 106 is fixed to the shaft 103), and passes through the partition walls 107 and 108. A seal mechanism (not shown) is provided in each of a penetrating portion through which the shaft 103 penetrates the partition 104 and a penetrating portion through the partition 107. An opening 110 that is opened and closed by the valve body 102 is provided in a through portion of the partition wall 108 of the shaft 103. The diaphragm 106 is urged to the left by a spring 111.

  A magnet 112 is attached to the inner wall of the casing 101 facing the magnetic body 103 a attached to the center of the sensor diaphragm 105. The F chamber is opened and closed by the valve body 102, and a hole 109 communicating with the atmosphere is provided.

  A lower pressure outlet 15 provided in the water collecting tank 7 communicates with the A chamber via the pressure guiding pipe 20, and an upper pressure outlet 16 provided in the water collecting tank 7 is communicated with the B chamber via the pressure guiding pipe 21. Communicating with Further, the differential pressure outlet 17 provided in the suction pipe 3 communicates with the C chamber via the pressure guiding pipe 22, and the differential pressure outlet 18 provided in the suction pipe 3 is communicated with the D chamber via the pressure guiding pipe 23. Communicating with

  The E chamber communicates with the vacuum accumulator 2 via the pressure guiding pipe 24, and the vacuum accumulating tank 2 communicates with the water collection tank 7 via the pressure guiding pipe 25. The pressure guiding pipe 25 is provided with a check valve 4 for preventing a back flow from the water collection tank 7 to the vacuum pressure accumulating tank 2. A high degree of vacuum in the downstream vacuum line 10 is always stored in the vacuum accumulator 2 by the check valve 4. Since the vacuum pressure of the vacuum accumulator 2 can be used when the atmosphere release valve 9 is operated, the valve opening degree of the atmosphere release valve 9 becomes larger, and the atmospheric pressure is collected from the atmosphere port 92 of the atmosphere release valve 9. 7 is supplied more smoothly.

  In addition, it is good also as a structure which does not provide the vacuum pressure accumulation tank 2. FIG. In this case, the E chamber communicates with the water collection tank 7 via the pressure guiding tube 24. Also in this case, the pressure guiding pipe 24 is provided with the check valve 4 for preventing the backflow from the water collection tank 7 to the E chamber. In the check valve 4, atmospheric air in the water collection tank 7 flows into the spring chamber 95 of the air release valve 9 when the air release valve 9 is activated and the valve body 91 is opened (the valve body 91 is raised). This is to prevent the valve from being closed (the valve body 91 is lowered). The F chamber communicates with the spring chamber 95 of the atmosphere release valve 9 through the pressure guiding pipe 26.

  Section valves 30 and 31 for maintenance are provided in the upstream and downstream vacuum lines of the lift loss reducing apparatus 100, respectively.

  Next, the operation of the lift loss reducing apparatus 100 will be described. When the sewage flows into the water collection tank 7 from the upstream side vacuum pipe 6 and is stored in the water collection tank 7, as shown in FIG. 1, the air release valve 9 is closed and the ventilation shutoff valve 13 is opened. ing. At this time, the vacuum pressure in the downstream vacuum line 10 is introduced into the water collection tank 7 via the vent pipe 11 and the vent shut-off valve 13 and transmitted to the upstream vacuum line 6 in a state where the pressure is not reduced. It will be done. As a result, the sewage enters the water collection tank 7 from the upstream vacuum line 6 and is temporarily stored in the water collection tank 7.

  The ventilation shutoff valve 13 is introduced into the piston chamber 135 through the atmospheric suction pipe 19 while the inside of the water collection tank 7 is evacuated by connecting the ventilation pipe 11 to the water collection tank 7. Since the diaphragm 134 lifts the valve body 131 against the elastic force of the spring 133, the ventilation shut-off valve 13 maintains an open state.

  The level of sewage in the water collection tank 7 rises, and the difference between the pressure taken out from the upper pressure outlet 16 and the pressure taken out from the lower pressure outlet 15 (pressure corresponding to the water depth h2) is larger than a predetermined threshold value. Then, the sensor diaphragm 105 moves to the right by overcoming the elastic force of the spring 111 and the magnetic attractive force between the magnet 112 and the magnetic body 103a, and pushes the shaft 103, whereby the valve body 102 is a hole communicating with the atmosphere. 109 is closed.

  At this time, when the sensor diaphragm 105 is pushed by the pressure taken out from the lower pressure outlet 15 and the shaft 103 starts to move, the elastic force of the spring 111 increases with the movement, but the magnet 112 and the magnetic body 103a. Since the magnetic attraction force between the first and second members decreases rapidly (in inverse proportion to the square of the moving distance), the shaft 103 moves to the position where the valve element 102 closes the hole 109 at a stroke.

  When the valve body 102 closes the hole 109, the vacuum pressure in the vacuum accumulator 2 is introduced into the piston chamber 95 of the air release valve 9 via the pressure guiding pipe 26, the F chamber, the E chamber, and the pressure guiding pipe 24 of the controller 1. Then, the diaphragm 94 pulls up the valve body 91 against the elastic force of the spring 93. When the valve body 91 of the atmosphere release valve 9 is pulled up, the atmosphere in the building 32 flows into the water collection tank 7 through the atmosphere port 92 of the atmosphere release valve 9. As described above, the atmosphere in the building 32 is supplied from the air intake pipe 14.

  As a result, when the pressure inside the water collection tank 7 becomes atmospheric pressure, the atmospheric pressure is transmitted to the piston chamber 135 of the ventilation cutoff valve 13 through the atmospheric suction pipe 19, and the valve body 131 of the ventilation cutoff valve 13 is pushed down to vent the ventilation. The shut-off valve 13 is closed. By closing the ventilation shutoff valve 13, the air in the upper part of the water collection tank 7 does not flow to the downstream vacuum pipe 10 through the ventilation shutoff valve 13, the ventilation pipe 11, and the merging tank 12, but enters the water collection tank 7. stay. That is, when the ventilation shutoff valve 13 is closed, the vacuum pressure in the merging tank 12 is transmitted through the downstream vacuum pipe 10 and the suction pipe 3.

  When the downstream vacuum line 10 is evacuated and the water collection tank 7 is at atmospheric pressure, when a pressure difference occurs between the downstream vacuum line 10 and the inside of the water collection tank 7, the sewage in the water collection tank 7 is downstream. The water is sucked into the suction pipe 3 communicating with the side vacuum pipe 10, and is supplied to the downstream vacuum pipe 10 through the suction pipe 3. At this time, since the air in the water collection tank 7 can be supplied from the simultaneous air suction pipe 8 to the sewage flowing in the suction pipe 3, the sewage in the vacuum pipe 10 is smoothly conveyed. Further, by providing the merging tank 12, the sewage flowing through the downstream side vacuum pipe 10 is made difficult to flow back to the vent pipe 11.

  When the sewage begins to be sucked, a differential pressure is generated between the differential pressure outlets 17 and 18, and this is transmitted to the C chamber and D chamber of the controller 1 through the pressure guiding tubes 22 and 23. This differential pressure is a force that pushes the diaphragm 106 to the right.

  As the level of sewage in the water collection tank 7 decreases, the pressure difference between the pressure in the A chamber communicating with the lower pressure outlet 15 and the pressure in the B chamber communicating with the upper pressure outlet 16 decreases or disappears. The force that pushes the sensor diaphragm 105 to the right is weakened or eliminated. However, while the sewage flows in the suction pipe 3, the valve body 102 is pushed to the right side due to the differential pressure between the C chamber and the D chamber. The hole 109 in the F chamber remains closed, and the air release valve 9 remains open.

  Since the sewage is sucked up into the suction pipe 3 until the level of the sewage reaches the level of the lower end 3a of the suction pipe 3, the sewage corresponding to the depth h3 of the water collection tank 7 is discharged. When the level of sewage falls to the level of the lower end 3a of the suction pipe 3, the suction pipe 3 sucks up air. Then, there is no differential pressure between the differential pressure outlets 17, 18, so that the diaphragm 106 is pushed to the left by the spring 111, the valve body 102 is pushed to the left, and the opening of the partition wall 108 is closed. As a result, the atmosphere flows into the F chamber, the atmosphere flows into the piston chamber 95 of the atmosphere release valve 9 through the pressure guiding pipe 26, the valve body 91 is pushed by the spring 93, and the atmosphere release valve 9 is closed.

  As described above, the lift loss reducing apparatus 100 according to the present embodiment has the water collection tank 7 for storing the liquid flowing in from the upstream side vacuum pipe 6 and one end disposed in the water collection tank 7 and the other end. Is connected to the downstream vacuum line 10, an air release valve 9 for communicating the water collection tank 7 to the atmosphere, an upper pressure outlet 16 for taking out the upper pressure of the water collection tank 7, and the water collection tank 7. And a controller 1 that opens the atmosphere release valve 9 according to the difference between the pressure taken out by the upper pressure take-out port 16 and the pressure taken out by the lower pressure take-out port 15. Therefore, the air release valve 9 can be opened by the difference between the upper pressure and the lower pressure in the water collection tank 7, and the sewage flowing from the upstream vacuum line 6 is installed at a position higher than the upstream vacuum line 6. Downstream It can be water in the vacuum line 10.

  Therefore, even if it is necessary to provide a lift (climbing gradient) in the middle of the downstream side vacuum pipe 10 in order to avoid an obstacle or the like, the use of this system can eliminate the lift loss of the portion, and thereby the vacuum. The sewage collection range of the sewage collection system can be widened. In addition, since the open / close control of the air release valve 9 that communicates the water collection tank 7 with the atmosphere is not performed electrically, but is performed mechanically, it can be used even when electricity cannot be used or when it is submerged. It becomes possible and the operation cost is also low.

  The upper pressure outlet 16 takes out the atmospheric pressure in the upper space in the water collection tank 7, and the lower pressure outlet 15 takes out the pressure of the sewage accumulated in the water collection tank 7. And the air release valve 9 is opened. Therefore, when the sewage in the water collection tank 7 becomes a predetermined water level or more, the difference between the water pressure taken out from the lower pressure outlet 15 and the air pressure in the water collection tank 7 taken out from the upper pressure outlet 16 exceeds a predetermined threshold. At that time, the controller 1 operates to open the air release valve 9.

  Further, since the lower pressure outlet 15 is provided at a position higher than the lower end 3 a of the suction pipe 3, the sewage enters the water collection tank 7 at least to a level at which only sewage can be sucked from the lower end 3 a of the suction pipe 3. Only when it is accumulated, a difference occurs between the pressure taken out from the upper pressure outlet 16 and the pressure taken out from the lower pressure outlet 15 so that the controller 1 can open the atmosphere release valve 9 and vice versa. When the sewage in the water collection tank 7 is small and the sewage does not accumulate in the water collection tank up to the level of the lower end 3a of the suction pipe 3, the pressure taken out from the upper pressure outlet 16 and the lower pressure outlet 15 are taken out. There is no differential pressure between the controller 1 and the controller 1 does not open the atmosphere release valve 9.

  The suction pipe 3 is provided with a lower differential pressure outlet 17 for taking out the lower pressure of the suction pipe 3 at a predetermined interval in the vertical direction and an upper differential pressure outlet 18 for taking out the upper pressure of the suction pipe 3. The controller 1 opens and closes the air release valve 9 by the pressure difference between the pressure taken out from the lower differential pressure outlet 17 and the pressure taken out from the upper differential pressure outlet 18, but the sewage in the water collection tank 7 is opened and closed. When the amount decreases and the gas in the water collection tank 7 is sucked into the suction pipe 3, the pressure difference between the upper pressure and the lower pressure of the suction pipe 3 decreases or disappears, and the controller 1 enters the standby state. The return air release valve 9 can be closed.

  The lift loss reducing device 100 further includes a ventilation shutoff valve 13 connected to the water collection tank 7 and connected to the downstream vacuum pipe line 10 through a gas passage ventilation pipe 11 and a merging tank 12. Therefore, the sewage can flow into the water collection tank 7 from the upstream side vacuum pipe line 6 by making the water collection tank 7 into a vacuum.

  Further, the ventilation shutoff valve 13 is closed when the inside of the water collection tank 7 is brought to atmospheric pressure, and is opened when the inside of the water collection tank 7 is evacuated. Therefore, the air release valve 9 is opened and the inside of the water collection tank 7 is large. When the atmospheric pressure is reached, the ventilation for allowing the sewage to flow from the upstream vacuum line 6 into the water collection tank 7 is blocked. That is, when the air release valve 9 is opened, the ventilation shutoff valve 13 can be closed accordingly.

  In the above-described embodiment, the example in which the lift loss reducing apparatus 100 is applied to a sewage collection system for collecting sewage (sewage) from home has been described. However, the lift loss reducing apparatus 100 of the present invention is not limited to this. However, the present invention may be applied to, for example, a system for collecting waste liquid and wastewater in factories, a wastewater collection system for building facilities, a wastewater collection system in leisure facilities, and the like.

  Moreover, although said embodiment demonstrated the example in which the lift loss reduction apparatus 100 is installed in the underground building 32, the installation place of the building 32 may be on the ground. When the installation location of the building 32 is on the ground, the air intake pipe 14 for taking air into the building 32 may not be provided.

  The present invention provides an air release valve for bringing the water collection tank to atmospheric pressure in order to send the liquid in the water collection tank to the downstream vacuum line higher than the upstream side vacuum line, and an upper pressure in the water collection tank. Since the atmospheric pressure is introduced into the water collection tank, the liquid in the water collection tank is pushed out from one end of the suction pipe to the other end, and the upstream vacuum line is connected. It has the effect of being able to flow, and is useful as a lift loss reducing device applied to a vacuum valve unit or the like of a vacuum sewage collection system.

DESCRIPTION OF SYMBOLS 100 Lift loss reduction apparatus 1 Controller 2 Vacuum accumulator 3 Suction pipe 3a Lower end 4 Check valve 5 Pipe check valve 6 Upstream vacuum pipe 7 Water collection tank 8 Simultaneous air suction pipe 9 Atmospheric release valve 10 Downstream vacuum pipe 11 Ventilation pipe 12 Junction tank 13 Ventilation shutoff valve 14 Air intake pipe 15 Lower pressure outlet 16 Upper pressure outlet 17 Lower differential pressure outlet 18 Upper differential pressure outlet 19 Atmospheric suction pipe 20 to 26 Pressure guide pipe 30, 31 Zone valve 91 Valve body 92 Atmosphere port 93 Spring 94 Diaphragm 95 Piston chamber 131 Valve body 132 Connection port 133 Spring 134 Diaphragm 135 Piston chamber 101 Casing 102 Valve body 103 Shaft 103a Magnetic body 104 Partition 105 Sensor diaphragm 106 Diaphragm 107 Partition 109 Partition wall 108 Partition wall 108 111 bar 112 magnet

Claims (7)

A lift loss reducing device for feeding liquid flowing in from an upstream vacuum line to a downstream vacuum line installed at a position higher than the upstream vacuum line,
A water collection tank for storing liquid flowing in from the upstream vacuum line;
A suction pipe having one end disposed in the water collection tank and the other end connected to the downstream vacuum line;
An air release valve communicating the water collection tank with the atmosphere;
An upper pressure outlet for taking out the upper pressure of the water collecting tank;
A lower pressure outlet for taking out the lower pressure of the water collecting tank;
A controller that opens the atmosphere release valve according to a difference between a pressure taken out by the upper pressure outlet and a pressure taken out by the lower pressure outlet;
A lift loss reducing device comprising: The upper pressure outlet takes out the upper pressure in the water collection tank,
2. The lift loss reducing device according to claim 1, wherein the lower pressure outlet takes out pressure at a liquid level of the liquid stored in the water collection tank.   The lift loss reduction device according to claim 1 or 2, wherein the lower pressure outlet is provided at a position higher than one end of the suction pipe. The suction pipe is provided with a lower differential pressure outlet for extracting the lower pressure of the suction pipe at a predetermined interval in the vertical direction and an upper differential pressure outlet for extracting the upper pressure of the suction pipe,
4. The controller according to claim 1, wherein the controller opens and closes the atmosphere release valve according to a difference between a pressure taken out by the lower differential pressure take-out port and a pressure taken out by the upper differential pressure take-out port. The lift loss reduction apparatus as described in any one of Claims.   5. The vent cut-off valve connected to the water collecting tank and connected to the downstream vacuum line via a gas passage vent pipe, according to claim 1. The lift loss reducing device described.   6. The lift loss reducing device according to claim 5, wherein the ventilation shut-off valve is closed when the inside of the water collection tank is brought to atmospheric pressure, and is opened when the inside of the water collection tank is evacuated. A lift loss reducing method for supplying water flowing from an upstream vacuum pipe to a downstream vacuum pipe installed at a position higher than the upstream vacuum pipe,
Store the liquid flowing in from the upstream vacuum line in the water collection tank,
The controller is activated by the difference between the upper pressure of the water collection tank and the lower pressure of the water collection tank, and opens the air release valve that communicates the water collection tank to the atmosphere, whereby the water collection tank space is brought to atmospheric pressure. When the ventilation shut-off valve is closed, one end is arranged in the water collection tank, and the other end is sucked in the liquid in the water collection tank by a suction pipe connected to the downstream side vacuum pipe. A lift loss reduction method characterized by flowing on a road.