JP6637363B2 - Vacuum valve control device and vacuum valve unit - Google Patents

Description

  The present invention relates to a vacuum valve control device and a vacuum valve unit.

  2. Description of the Related Art Conventionally, a vacuum-type sewer collection system has been used when sewage pipes cannot be arranged with a continuous downward slope, such as in a flat and wide area. As this type of vacuum-type sewer collection system, it is known to use a vacuum valve unit connected to a vacuum line communicating with a vacuum tank as shown in Patent Document 1.

  The vacuum valve unit of Patent Document 1 has a suction pipe whose tip is disposed in a sewage basin, a vacuum valve disposed between a vacuum system for transferring sewage by vacuum suction and a suction pipe, and a predetermined suction pipe. The first differential pressure detection pipe connected to the height of the first differential pressure detection pipe, the second differential pressure detection pipe connected to a height lower than the connection position of the first differential pressure detection pipe, the first differential pressure detection pipe and the second A mechanical vacuum valve control device that operates based on the pressure in the differential pressure detection tube and controls the opening / closing operation of the vacuum valve; and a first differential pressure detection tube, a second differential pressure detection tube, and a vacuum valve control device. A first connecting nozzle and a second connecting nozzle are provided on side portions of the first differential pressure detecting tube and the second differential pressure detecting tube, respectively. The second connection nozzle is configured to be connected to the flexible tube.

  In the vacuum valve control device, a first chamber and a second chamber are formed with the first diaphragm interposed therebetween, and a third chamber and a fourth chamber are formed with the second diaphragm interposed therebetween. A shaft (shaft) extending in the thickness direction of each diaphragm is arranged in the vacuum valve control device. A fifth chamber and a sixth chamber adjacent to each other via a partition are formed in the vacuum valve control device. A valve body is fixed to an end of the shaft. A valve seat having a through hole is provided on a partition wall between the fifth and sixth chambers and on a wall of the sixth chamber facing the partition wall. The shaft reciprocates in the axial direction of the shaft to seal one of the pair of valve seats.

The vacuum valve unit configured as described above operates as follows. In advance, the vacuum valve is closed and the valve seat seals the valve seat of the partition.
When the water level of the sewage in the sewage tank exceeds a predetermined level, the pressure in the water level detection pipe increases, and the pressure of the air in the first chamber and the pressure of the air in the second chamber of the vacuum valve control device become different. Occurs. This pressure difference causes the shaft of the vacuum valve controller to move. The valve seat seals the valve seat on the wall and opens the vacuum valve. By the suction force of the vacuum tank, sewage flows through a suction pipe, a vacuum valve, and a line, and the sewage is treated in a sewage treatment facility or the like. At this time, a difference is generated between the pressure of the air in the third chamber and the pressure of the air in the fourth chamber due to the sewage flowing in the suction pipe. This forces the valve seat against the valve seat on the wall.

Then, even if the water level of the sewage falls and the pressure of the air in the first chamber becomes the atmospheric pressure, the vacuum valve is operated while the pressure of the air in the third chamber and the pressure of the air in the fourth chamber are different. It remains open.
When the level of the sewage in the sewage tank falls below the first end of the suction pipe, the sewage does not flow through the suction pipe, and the difference between the pressure of the air in the third chamber and the pressure of the air in the fourth chamber disappears. The shaft moves and the valve seat seals the valve seat in the bulkhead. The vacuum valve closes and sewage stops flowing through the suction pipe and the like.

JP 2011-196112 A

However, in a conventional differential pressure detection type vacuum valve unit, two differential pressure detection tubes are connected to a vacuum valve control device from a suction pipe, and the vacuum valve control device also has two differential pressure detection tubes and a water level detection tube (that is, a water level detection tube). Since it is necessary to cope with pressure fluctuations caused by three detection tubes), three pressure fluctuation spaces in the vacuum valve control device are provided. Furthermore, since the first diaphragm and the second diaphragm are provided to partition these three pressure fluctuation spaces, there is a problem that the structure becomes complicated.
Further, from the viewpoint of workability, there is a demand for a vacuum valve control device that can be housed compactly, and there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and has a vacuum valve control device that can have a simple structure including one diaphragm and can be compactly stored in a sewage tank. It is an object to provide a vacuum valve unit.

In order to achieve the above object, a vacuum valve control device according to the present invention is controlled based on the water level of a water level detection tube having a lower end disposed in a sewage water tank, and a suction pipe having a suction end disposed in the sewage water tank. A vacuum valve control device for controlling a vacuum valve that is opened and closed by supplying vacuum and atmospheric pressure, the first valve being connected to the water level detection pipe. A housing in which a chamber, a second chamber communicating with the suction pipe, a third chamber communicating with the vacuum conduit, and a fourth chamber communicating with a piston chamber of the vacuum valve are formed; and an opening and closing operation of the vacuum valve Valve opening / closing mechanism for switching between vacuum and atmospheric pressure supplied for operation, a reciprocally movable shaft for operating the vacuum valve opening / closing mechanism, and a spring for urging the shaft in a direction to close the vacuum valve If, and partitions the second chamber and the first chamber And a reciprocable one diaphragm to the shaft-like body and integral, negative pressure detection pipe is provided between the suction pipe and the vacuum valve, and a second chamber with negative pressure detection pipe The fourth chamber is connected through one connecting pipe, and the fourth chamber is communicated with or interrupted from the third chamber by the reciprocating operation of the shaft-like body, and communicates with the outside of the housing or When the differential pressure is generated between the first chamber and the second chamber on both sides of the diaphragm, the shaft-like body is turned off to make the air in the fourth chamber a negative pressure and open the vacuum valve. It is characterized by moving.

Further, a vacuum valve unit according to the present invention is a vacuum valve unit provided with the above-described vacuum valve control device, wherein a water level detection pipe connected to the first chamber via a first connection pipe; A suction pipe connected to the chamber via a second connection pipe and the negative pressure detection pipe, and a suction pipe connected to the third chamber via a third connection pipe for connecting between the waste water tank and the vacuum tank. A vacuum line provided with a vacuum valve and a vacuum valve connected to the fourth chamber via a fourth connection pipe are provided.

  According to the present invention, when the water level of the sewage accumulated in the sewage basin increases with the vacuum valve closed and the water level of the water level detection tube rises, the space in the first chamber communicating with the water level detection tube becomes positive pressure, and the diaphragm and Depress the shaft. By the downward movement of the shaft-like body, communication between the third chamber and the fourth chamber communicating with the vacuum pipe line in a vacuum state is established, and between the fourth chamber and the outside of the housing is cut off. The space in the fourth chamber becomes a negative pressure, and the piston chamber of the vacuum valve communicating with the fourth chamber is evacuated to open the vacuum valve. As a result, the sewage sucked from the suction valve flows into the vacuum pipe, and during suction of the sewage, the suction pipe has a negative pressure. Therefore, the space in the second chamber communicating with the suction pipe also has a negative pressure, and the force for lowering the diaphragm. Works. Then, as the level of the sewage in the sewage decreases, the pressure in the space in the first chamber also decreases, but the diaphragm remains in a lowered state with the second chamber being under negative pressure. When the water level of the sewage further decreases and air is sucked from the suction pipe, the negative pressure in the space of the second chamber is reduced and the diaphragm and the shaft are pushed up by the bias of the spring. Thereby, the third chamber and the fourth chamber are shut off, the fourth chamber communicates with the outside of the housing, and the space in the fourth chamber becomes atmospheric pressure, and communicates with the fourth chamber. Air is supplied to the vacuum valve and the vacuum valve closes.

  As described above, in the present invention, the negative pressure detection system is configured such that only one second connection pipe is connected from the suction pipe to the inside of the casing of the vacuum valve control device, and the second connection pipe is connected to the water level detection pipe. A pressure fluctuation space corresponding to a pressure fluctuation caused by two connection pipes with one connection pipe is a first chamber and a second chamber. In other words, a simple configuration in which only one diaphragm is provided in the vacuum valve control device is provided, and two differential pressure detection tubes are connected to the vacuum valve control device, as compared with the configuration of the conventional differential pressure detection system including two diaphragms. It is possible to simplify and reduce the size of the vacuum valve unit, improve the fit in the vacuum valve unit, and improve the workability during installation or maintenance.

  The vacuum valve control device according to the present invention may further include a first magnetic force generator attached to a radially outer side of the shaft-like body in the diaphragm, and a wall portion that forms the first chamber and faces the diaphragm. The first magnetic force generator generates a magnetic force attracting the first magnetic force generator, the vacuum valve closes when the first magnetic force generator approaches, and the vacuum when the first magnetic force generator separates from the first magnetic force generator. And a second magnetic force generator that opens the valve.

  In this case, before the vacuum valve is forcibly opened, the first magnetic force generator and the second magnetic force generator approach to close the vacuum valve, so that no wastewater flows in the suction pipe. . On the other hand, the user forcibly moves the shaft body in the axial direction by a switch or the like to separate the first magnetic force generator and the second magnetic force generator, so that the vacuum valve is opened and waste water is sucked into the suction pipe. It can be sucked and the sewage can flow into the vacuum line.

  ADVANTAGE OF THE INVENTION According to the vacuum valve control apparatus and the vacuum valve unit of this invention, it can be set as the simple structure comprised by one diaphragm, and it becomes possible to accommodate compactly in sewage basin.

It is a side view which shows schematic structure of the vacuum valve unit provided in the sewage basin by embodiment of this invention. FIG. 2 is a side sectional view schematically showing a configuration of a vacuum valve control device and a vacuum valve unit shown in FIG. 1. (A), (b) is side sectional drawing for demonstrating operation | movement of a vacuum valve unit. (A), (b) is side sectional drawing for demonstrating operation | movement of a vacuum valve unit. (A), (b) is side sectional drawing for demonstrating operation | movement of a vacuum valve unit.

  Hereinafter, a vacuum valve control device and a vacuum valve unit according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the vacuum valve unit 1 according to the present embodiment includes a suction pipe 11, a vacuum valve 12, and a vacuum valve control device 21, and is disposed in a sewage chamber 101 buried in the ground G. Is housed. Further, a water level detecting tube 14 is provided in the sewage tank 101. Then, the suction end 11 a of the suction pipe 11 and the lower end 14 a of the water level detection pipe 14 are arranged so as to be located in the sewage W in the sewage tank 101. The upper opening of the sewage trough 101 is covered with a lid 101a.

  As shown in FIG. 2, the vacuum valve control device 21 controls the vacuum valve 12 arranged between the suction pipe 11 and the vacuum pipe 103 for transferring the sewage W by a vacuum suction force. The vacuum valve control device 21 includes a casing (housing) 22, a shaft (shaft) 23 disposed in the casing 22, a shaft biasing spring (spring) 24, a diaphragm 25, a first chamber 26, and a second chamber. 27, a third chamber 28, and a fourth chamber 29.

The casing 22 has a casing main body 33 formed in a cylindrical shape, and a lid 35 (wall) attached to the casing main body 33 with bolts. The plurality of bolts are arranged at intervals around the axis C of the shaft 23 which is the axis of the casing body 33.
The casing main body 33 has a first partition wall extending from one (upper side in FIG. 1) first end 33 a of the casing main body 33 in the direction of the axis C to the other (lower side in FIG. 1) second end 33 b. 37, the second partition 38, and the third partition 39 are formed in this order with a space therebetween.
Here, in the present embodiment, in the vacuum valve control device 21, the direction along the axis C direction of the casing main body 33 is referred to as the up-down direction, and the lid 35 side of the casing 22 is referred to as the upper side in the up-down direction. The 39 side is called the lower side. The casing 22 is arranged such that the second end 33b of the casing main body 33 is lower than the first end 33a of the casing 22 by Z1.

  The above-described diaphragm 25 is disposed in a vertically intermediate portion of an internal space formed between the lid 35 and the first partition 37. The diaphragm 25 divides this internal space into a first chamber 26 and a second chamber 27. When the pressure in the first chamber 26 becomes higher than the pressure in the second chamber 27, the first chamber 26 and the second chamber 27 generate a differential pressure on the upper and lower sides of the diaphragm 25, and the shaft 23 is evacuated. 12 is moved in the opening direction.

  The diaphragm 25 is formed in a disk shape with an elastic material such as rubber. An iron plate (a plate made of iron, a first magnetic force generator) 41 is attached to the diaphragm 25. The iron plate 41 is formed in a disk shape with a material such as ferrite, for example. That is, the iron plate 41 is attached to at least the radial outside of the shaft 23 in the diaphragm 25. The iron plate 41 is formed sufficiently thin, and when the diaphragm 25 is deformed, the iron plate 41 is deformed integrally with the diaphragm 25.

A plurality of permanent magnets (second magnetic force generators) 43 are attached to the lid 35 that forms the first chamber 26 of the casing 22 and faces the diaphragm 25. Here, the term “opposite” includes not only the case where the diaphragm 25 and the cover 35 are separated but also the case where the diaphragm 25 and the cover 35 are in contact with each other. In addition, the case where another member is disposed between the diaphragm 25 and the lid 35 is also included.
The plurality of permanent magnets 43 are arranged at intervals around the axis C. The plurality of permanent magnets 43 are preferably arranged at equal angles around the axis C. Each of the permanent magnets 43 is attached to a surface of the lid 35 facing the diaphragm 25 with an adhesive or the like.

Each permanent magnet 43 generates a magnetic force attracting the iron plate 41. When the permanent magnet 43 and the iron plate 41 approach each other due to the diaphragm 25 contacting the permanent magnet 43, the magnetic force acting on the permanent magnet 43 and the iron plate 41 increases. Since the plurality of permanent magnets 43 are arranged at intervals around the axis C, a magnetic force is generated substantially uniformly around the axis C between the permanent magnet 43 and the iron plate 41, and the shaft 23 Is suppressed.
On the other hand, when the permanent magnets 43 and the iron plate 41 are separated from each other, the magnetic force acting on the permanent magnets 43 and the iron plate 41 becomes weak.

The cover 35 is provided with a switch 45 that is movable in the direction of the axis C with respect to the cover 35. More specifically, a through-hole is formed in the lid 35 in the direction of the axis C on the axis C, and the switch 45 is inserted into the through-hole. The switch 45 is formed in a column shape having the axis C as an axis. The switch 45 is inserted into a switch biasing spring 46 which is, for example, a helical spring. The switch 45 and the switch biasing spring 46 are covered with a cover 47 that seals the through hole of the lid 35. The end of the switch 45 is in contact with the upper surface of the diaphragm 25.
When no external force is applied to the switch 45, the switch 45 is moved upward Z2 by the urging force of the switch urging spring 46. On the other hand, when the user moves the switch 45 downward Z1 with respect to the lid 35 against the urging force of the switch urging spring 46, the shaft 23 moves downward Z1.

In the second partition 38, a first valve seat 50 having a first through hole 38a is arranged on the axis C.
A second valve seat 54 having a second through hole 54a is disposed on the axis C at a position of the third partition wall 39 facing the second partition wall 38. The second valve seat 54 is disposed below the first valve seat 50 at Z1.

The shaft 23 is fixed to the diaphragm 25 so as to extend downward Z1 via the diaphragm 25. That is, the diaphragm 25 reciprocates in the direction of the axis C integrally with the shaft 23. The shaft 23 is not fixed to the first partition 37 and passes through the first partition 37 so as to be movable in the direction of the axis C with respect to the first partition 37. Between the first partition 37 and the shaft 23, there is provided a seal mechanism whose reference numeral is omitted.
The shaft 23 is inserted into a shaft biasing spring 24. The shaft urging spring 24 urges the shaft 23 and the diaphragm 25 against the casing body 33 in a direction to close the vacuum valve 12.

A valve body 56 is fixed to a lower end portion of the shaft 23 disposed in the fourth chamber 19. The third chamber 28, the fourth chamber 29, the valve body 56, and the first through hole 38 a and the second through hole 54 a are provided with a vacuum valve opening and closing for switching vacuum and atmospheric pressure supplied for opening and closing the vacuum valve 12. The mechanism 55 is constituted. The shaft 23 operates the vacuum valve opening / closing mechanism 55 by reciprocating in the direction of the axis C as described later.
When the shaft 23 moves upward Z2 and the valve body 56 comes into contact with the first valve seat 50, the first through hole 38a of the first valve seat 50 is shut off by the valve body 56. At this time, since the second through hole 54a of the second valve seat 54 is not blocked, the fourth chamber 29 communicates with the outside air.
On the other hand, when the shaft 23 moves downward Z <b> 1 and the valve body 56 contacts the second valve seat 54, the second through hole 54 a of the second valve seat 54 is shut off by the valve body 56. At this time, since the first through hole 38a of the first valve seat 50 is not blocked, the third chamber 28 and the fourth chamber 29 communicate with each other.

The water level detection pipe 14 communicates with the first chamber 26 via the first connection pipe 61.
The suction pipe 11 has a communication hole 11 b connected to the negative pressure detection pipe 13 between the suction end 11 a of the suction pipe 11 and the vacuum valve 12. An air suction pipe 11c communicating with the outside air is provided between the connection part of the suction pipe 11 with the vacuum conduit 103 and the communication hole 11b. The negative pressure detecting tube 13 is in communication with the second chamber 27 via the second connecting tube 62.

The vacuum valve 12 has a valve diaphragm 12b arranged in the piston chamber 12a, and a vacuum valve spring 12c for urging the valve diaphragm 12b. A valve body 12d is fixed to the valve diaphragm 12b.
When the shaft 23 moves upward Z2 and the pressure of the air in the piston chamber 12a of the vacuum valve 12 becomes the atmospheric pressure as described later, the vacuum valve spring 12c is extended and the valve body 12d is connected to the suction pipe 11 and the vacuum pipe. It comes into contact with the connection portion with 103. As a result, the suction pipe 11 and the vacuum conduit 103 are cut off by the valve body 12d, and the vacuum valve 12 is closed.
On the other hand, when the shaft 23 moves downward Z1 and the inside of the piston chamber 12a becomes a negative pressure (vacuum) as described later, the vacuum valve spring 12c contracts and the valve body 12d moves between the suction pipe 11 and the vacuum conduit 103. Away from the connection. As a result, the suction pipe 11 and the vacuum pipe 103 are brought into communication with each other, and the vacuum valve 12 is opened.

The piston chamber 12a communicates with the fourth chamber 29 via the fourth connection pipe 64.
A portion of the vacuum pipe 103 downstream of the vacuum valve 12 communicates with the third chamber 28 via a third connection pipe 63.
Here, the first connecting pipe 61 and the second connecting pipe 62 are bundled at a middle portion in the longitudinal direction to form a connecting pipe set 67. The connection pipe set 67 can be formed of a resin such as polyethylene. An intermediate portion in the longitudinal direction of the connection pipe set 67 is inserted into a communication hole 105 a of a partition plate 105 attached to the sewage tank 101. This partition plate 105 is used as a scaffold for the user.

The functions of the chambers 26, 27, 28, 29 and the connecting pipes 61, 62, 63, 64 formed in the casing 22 of the above-described vacuum valve control device 21 are as follows.
The first chamber 26 is connected to the water level detection pipe 14 via the first connection pipe 61. The first connection pipe 61 has a function of pushing down the diaphragm 25 of the vacuum valve control device 21 by the water pressure of the sewage W accumulated in the sewage tank 101.
The second chamber 27 is connected to the negative pressure detection pipe 13 branched from the suction pipe 11 via the second connection pipe 62. The second connecting pipe 62 has a function of pulling down the diaphragm 25 by a negative pressure generated in the suction pipe 11 when the vacuum valve 12 is opened.
The third chamber 28 is connected to the vacuum line 103 via the third connection pipe 63. The third connection pipe 63 has a function of supplying a vacuum (negative pressure) for opening the vacuum valve 12.
The fourth chamber 29 is connected to the piston chamber 12a of the vacuum valve 12 via the fourth connection pipe 64. The fourth connection pipe 64 has a function of supplying vacuum or air to the vacuum valve 12.

Next, an operation procedure and an operation using the above-described vacuum valve control device 21 and the vacuum valve unit 1 will be specifically described with reference to FIGS.
In FIG. 3A, the water level of the sewage W in the sewage tank 101 is relatively high. At this time, the pressure in the water level detection pipe 14 increases, and the pressure of the air in the water level detection pipe 14 and the first connection pipe 61 and the pressure of the air in the first chamber 26 are positive pressure PH.
Hereinafter, in FIGS. 3 to 5, air having a positive pressure PH (higher than the atmospheric pressure PM) is indicated by relatively dark gray dots. Air at negative pressure PL (pressure lower than atmospheric pressure PM) is indicated by relatively light gray dots. Air at atmospheric pressure PM is shown in white.

In addition, in FIG. 2, since the sewage W does not flow in the suction pipe 11, there is no air pressure difference between the first chamber 26 and the second chamber 27. The shaft 23 is moved upward Z2 by the urging force of the shaft urging spring 24. The switch 45 is moved upward Z2 by the urging force of the switch urging spring 46.
Therefore, as shown in FIG. 3A, the valve body 56 is in contact with the first valve seat 50. Since the second through hole 54a of the second valve seat 54 is not blocked, the pressure of the air in the fourth chamber 29 becomes the atmospheric pressure PM. The pressure of the air in the piston chamber 12a of the vacuum valve 12 communicating with the fourth chamber 29 via the fourth connection pipe 64 is the atmospheric pressure PM.

  Since the inside of the vacuum line 103 communicates with a vacuum tank (not shown), the pressure of the air in the vacuum line 103 is a negative pressure PL. The valve body 12d of the vacuum valve 12 is located closer to the connection between the suction pipe 11 and the vacuum pipe 103 due to the expansion of the vacuum valve spring 12c due to the pressure difference between the piston chamber 12a and the vacuum pipe 103. The vacuum valve 12 is closed.

When the water level of the sewage W in the sewage chamber 101 rises from the state of FIG. 1, the vacuum valve control device 21 performs a vacuum valve opening operation described below.
That is, the pressure of the air in the water level detection pipe 14 increases to a positive pressure PH, and the pressure of the air in the first chamber 26 communicating with the water level detection pipe 14 via the first connection pipe 61 increases. It becomes PH. At this time, a pressure difference occurs between the first chamber 26 and the second chamber 27, and as shown in FIG. 2, the diaphragm 25 applies the urging force of the shaft urging spring 24 and the magnetic force acting on the iron plate 41 and the permanent magnet 43. Move with the shaft 23 downward Z1. This weakens the magnetic force acting on the iron plate 41 and the permanent magnet 43.
At this time, the vacuum valve 12 is in a closed state, and the inside of the third connection pipe 63 and the inside of the third chamber 28 communicating with the vacuum conduit 103 are at the negative pressure PL.

  Then, as shown in FIG. 3B, the valve body 56 is separated from the first valve seat 50, and the valve body 56 comes into contact with the second valve seat 54. Since the first through hole 38a of the first valve seat 50 is not blocked, the third chamber 28 and the fourth chamber 29 communicate with each other, and both the chambers 28 and 29 become the negative pressure PL. Thus, the inside of the fourth connection pipe 64 communicating with the fourth chamber 29 also has a negative pressure PL, and the pressure of the air in the piston chamber 12a of the vacuum valve 12 that communicates through the fourth connection pipe 64 becomes the negative pressure PL. Then, the vacuum valve spring 12c contracts, and the valve body 12d is raised. When the vacuum valve 12 is opened, the suction pipe 11 and the vacuum pipe 103 communicate with each other, and the pressure of the air in the suction pipe 11 becomes a negative pressure PL, and the sewage W collected in the sewage water 101 is sucked into the suction pipe 11. And flows into the vacuum conduit 103. At this time, as shown in FIG. 2, the air flowing into the suction pipe 11 through the air suction pipe 11c and the sewage W are mixed.

  Next, as shown in FIG. 4A, the flow of the sewage W into the suction pipe 11 causes the pressure of the air in the second connection pipe 62 and the second chamber 27 to become the negative pressure PL. That is, since the pressure of the air in the first connection pipe 61 and the first chamber 26 is higher than the pressure of the air in the second connection pipe 62 and the second chamber 27, the diaphragm 25 and the shaft 23 are further lowered Z1. Is pushed down.

  Next, as shown in FIG. 4B, when the sewage W flows into the suction pipe 11 and the water level of the sewage W decreases, the air level in the water level detection pipe 14, the first connection pipe 61 and the first chamber 26 is reduced. The pressure decreases from the positive pressure PH to the atmospheric pressure PM (see FIG. 5A). At this time, the pressure of the air in the second chamber 27 remains at the negative pressure PL, and the diaphragm 25 remains in a lowered state.

  Further, as shown in FIG. 5A, the sewage W flows into the suction pipe 11, and the water level of the sewage W drops to the position L1. At this time, the pressure of the air in the water level detection pipe 14, the first connection pipe 61, and the first chamber 26 becomes the atmospheric pressure PM, and the water level of the sewage W becomes lower Z1 than the suction end 11a of the suction pipe 11. When the air E is sucked up from the suction pipe 11, the second connecting pipe 62 and the second chamber 27 become the atmospheric pressure PM, and the pressures of the air in the chambers 26 and 27 on both sides of the diaphragm 25 become substantially equal. Then, the shaft 23 and the diaphragm 25 move upward Z2 by the urging force of the shaft urging spring 24, and the magnetic force acting on the iron plate 41 and the permanent magnet 43 increases as shown in FIG.

  Thereafter, as shown in FIG. 5B, the valve body 56 is separated from the second valve seat 54, and the valve body 56 comes into contact with the first valve seat 50. Since the through hole 54a of the second valve seat 54 is not sealed, the pressure of the air in the fourth chamber 29 becomes the atmospheric pressure PM. The pressure of the air in the piston chamber 12a communicating with the fourth chamber 29 via the fourth connection pipe 64 becomes the atmospheric pressure PM, and the vacuum valve 12 closes.

Then, as shown in FIG. 3A, when the water level of the sewage W in the sewage tank 101 rises again, the above-described vacuum valve opening step and the vacuum valve closing step are performed, and the sewage W in the sewage tank 101 is sucked into the suction pipe. Flow into 11.
As described above, normally, the vacuum valve 12 is automatically closed or opened under the control of the vacuum valve control device 21.

Next, when the vacuum valve 12 is forcibly opened, the steps described below are performed.
That is, as shown in FIG. 2, the user removes the lid 101a from the sewage tank 101. At this time, the iron plate 41 is approaching the plurality of permanent magnets 43, and the vacuum valve 12 is closed. When the switch 45 is moved downward Z1 by a finger or the like against the urging force of the switch urging spring 46 and the magnetic force acting on the iron plate 41 and the permanent magnet 43, the diaphragm 25 and the shaft 23 move together with the switch 45 in the lower Z1. Go to
Thus, as shown in FIGS. 3B and 4A, the valve body 56 is separated from the first valve seat 50, the valve body 56 comes into contact with the second valve seat 54, and the third chamber 28 is The fourth chamber 29 communicates with the fourth chamber 29, and the pressure of the air in the fourth chamber 29 and the pressure of the air in the piston chamber 12a become a negative pressure PL, and the vacuum valve spring 12c contracts to open the vacuum valve 12. Then, the sewage W flows through the suction pipe 11 and the vacuum pipe 103.

  When the pressure of the air in the first connection pipe 61 and the first chamber 26 is higher than the pressure of the air in the second connection pipe 62 and the second chamber 27, the shaft 23 is pressed downward Z1. When the finger is released from the switch 45, the switch 45 moves upward Z2 by the urging force of the switch urging spring 46, but since the valve body 56 remains in contact with the second valve seat 54, the suction end of the suction pipe 11 Until the part 11a sucks air, the sewage W continues to flow in the suction pipe 11.

Thus, in the present embodiment, as shown in FIG. 2, only one second connecting pipe 62 is connected from the suction pipe 11 to the casing 22 of the vacuum valve control device 21 through the negative pressure detecting pipe 13. This is a pressure detection type configuration, and the pressure fluctuation space corresponding to the pressure fluctuation caused by the two connection pipes of the second connection pipe 62 and the first connection pipe 61 connected to the water level detection pipe 14 is formed by the first chamber 26 and the second chamber 26. It becomes the room 27.
That is, a simple configuration in which only one diaphragm 25 is provided in the vacuum valve control device 21 is provided, and two differential pressure detection tubes are connected to the vacuum valve control device, and the configuration of the conventional differential pressure detection system including two diaphragms is adopted. Compared to this, it is possible to make the vacuum valve unit 1 simpler and smaller, the fit inside the vacuum valve unit 1 is improved, and the workability during installation or maintenance can be improved.

Further, according to the vacuum valve control device 21 of the present embodiment, before the vacuum valve 12 is forcibly opened, the permanent magnet 43 and the iron plate 41 approach to close the vacuum valve 12, and the inside of the suction pipe 11 is closed. Is in a state where the wastewater W does not flow. On the other hand, when the user operates the switch 45 to move the shaft 23 in the direction of the axis C to separate the permanent magnet 43 and the iron plate 41, the vacuum valve 12 is opened and the sewage W is sucked into the suction pipe 11. As a result, the sewage W can flow through the vacuum pipe 103.
Therefore, by manually operating the switch 45, it is possible to switch from a state in which the sewage W does not flow in the suction pipe 11 to a state in which the sewage W flows in the suction pipe 11.

  As described above, the vacuum valve control device 21 and the vacuum valve unit 1 according to the present embodiment can have a simple structure including one diaphragm 25, and can be compactly stored in the sewage tank 101. Becomes

  As described above, the embodiments of the vacuum valve control device and the vacuum valve unit according to the present invention have been described. However, the present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist thereof. .

For example, a pressure adjusting mechanism that takes in outside air and adjusts the pressure in the second chamber may be provided in the middle of the second connecting pipe 62. When the degree of vacuum in the vacuum pipe 103 is extremely high, even when the water level of the sewage W drops and the air E is sucked from the suction pipe 11 as shown in FIG. 5B, the pressure in the suction pipe 11 does not increase and the second chamber does not rise. May not be able to close the vacuum valve 12 due to the negative pressure. However, by providing a pressure adjusting mechanism that takes in outside air from the middle of the second connection pipe line 62, the negative pressure in the second chamber is adjusted. When the air E is sucked from the suction pipe 11, the vacuum valve 12 can be reliably closed.
The pressure adjusting mechanism is not limited to a structure that takes in outside air, and for example, a balloon or a tank that stores air in advance may be connected in the middle of the second connecting pipe 62. Further, a pressure adjusting mechanism composed of two chambers separated by one diaphragm is provided in the middle of the second connecting pipe 62, and one chamber is connected to the second connecting pipe 62, and the other chamber is connected to the vacuum valve control. The second chamber 27 of the apparatus may be connected, and the negative pressure of the suction pipe 11 may be transmitted to the second chamber 27 via the diaphragm. By providing such a balloon, a tank, and a diaphragm in the middle of the second connecting pipe 62, the vacuum valve 12 can be reliably closed.
Further, the inside of the suction pipe 11 becomes a positive pressure due to the water hammer generated at the start of the suction of the sewage (FIG. 3 (b)), and the second chamber is informed of the vacuum valve control from the suction pipe 11 via the second connecting pipe 62. Although the sewage may flow back to the second chamber 27, it is possible to prevent the sewage from flowing back to the second chamber 27 by providing a balloon or a diaphragm in the middle of the second connection pipe 62.

  Further, a pressure adjusting mechanism for taking in outside air may be provided in the second chamber 27 itself of the vacuum valve. In this case, the pressure adjusting mechanism may have a structure in which a vent communicating with the second chamber 27 is provided on the outer surface of the vacuum valve control device. In this case, in order to prevent infiltration of sewage into the second chamber 27, an air reservoir such as a balloon in which air is stored in advance is provided in the ventilation port, or a float having a specific gravity lower than that of water is used as a valve so that the sewage is ventilated. An air valve that closes and closes the vent when reaching the mouth may be connected.

  In addition, instead of the switch 45 for forcibly opening the vacuum valve 12, a substantially spherical main body formed by molding a rubber material into a substantially spherical shape, and a check valve for taking in air from outside provided on the upper portion of the substantially spherical main body, Forcibly actuated balls composed of a cylindrical hose connection port provided at the lower part of the substantially spherical main body may be used. Connecting the hose connection port of this forced operation ball to the forced operation vent provided in the first chamber 26 of the vacuum valve control device by a flexible hose, and squeezing the substantially spherical main body by hand. The air in the substantially spherical body is pushed out from the lower cylindrical hose connection port to apply a positive pressure to the first chamber 26, the diaphragm 25 is pushed down, and the negative pressure is transmitted from the connecting pipe 63 to the connecting pipe 64, and a vacuum valve is provided. Is opened. When the hand is released, the outside air is taken into the substantially spherical body from the check valve provided on the upper part of the substantially spherical body, and returns to the original shape.

  Further, instead of the switch 45 for forcibly opening the vacuum valve 12, a substantially spherical main body formed by molding a rubber material into a substantially spherical shape, and a small-diameter air vent hole at the top of the substantially spherical main body to allow air to gradually escape. Alternatively, a forcibly actuated ball constituted by a cylindrical hose connection port provided at a lower portion of the substantially spherical main body may be used. Connecting the hose connection port of the forced operation ball to the forced operation vent provided in the second chamber 27 of the vacuum valve control device with a flexible hose, and squeezing the substantially spherical main body by hand. The air in the substantially spherical body is pushed out from the lower cylindrical hose connection port to apply a positive pressure to the second chamber 27, but this positive pressure is gradually released by the air being released from the air vent hole of the forcibly operated ball. . Thereafter, when the hand is released, the air in the second chamber 27 is sucked when the substantially spherical main body returns to the original state, so that the inside of the second chamber 27 becomes a negative pressure, the diaphragm 25 is pushed down, and the connecting pipe 63 is connected to the connecting pipe 63. The negative pressure is transmitted to 64 and the vacuum valve is opened.

  In addition, the configuration of the shape and size of the casing 22 of the vacuum valve control device 21, the length, arrangement, connection position, and the like of each of the connection pipes 61, 62, 63, and 64 are not limited to the present embodiment. It can be set as appropriate according to the size of the sewage tank 101 or the like.

  Further, the size (width) of the space of each of the chambers 26, 27, 28, 29 formed in the vacuum valve control device 21 also depends on the desired pressure obtained through each of the connecting pipes 61, 62, 63, 64. And set it.

  In addition, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Vacuum valve unit 11 Suction pipe 11a Suction end part 12 Vacuum valve 12a Piston chamber 12c Spring for vacuum valve 12d Valve element 14 Water level detection pipe 13 Negative pressure detection pipe 21 Vacuum valve control device 22 Casing (housing)
23 Shaft (shaft)
24 Shaft biasing spring (spring)
25 diaphragm 26 first room 27 second room 28 third room 29 fourth room 35 lid (wall)
41 Iron plate (first magnetic force generator)
43 permanent magnet (second magnetic force generator)
45 Switch 55 Vacuum valve opening / closing mechanism 101 Sewage drain 103 Vacuum line C axis W

Claims (3)

The suction end is controlled based on the water level of a water level detection tube whose lower end is disposed in the sewage water trough, and the suction end is disposed between the suction pipe disposed in the sewage water trough and a vacuum pipe that transfers the sewage by vacuum suction. A vacuum valve control device that controls a vacuum valve that opens and closes by supplying vacuum and atmospheric pressure,
A housing having therein a first chamber communicating with the water level detection pipe, a second chamber communicating with the suction pipe, a third chamber communicating with the vacuum pipe, and a fourth chamber communicating with a piston chamber of the vacuum valve. Body and
A vacuum valve opening and closing mechanism for switching between vacuum and atmospheric pressure supplied for opening and closing the vacuum valve,
A reciprocally movable shaft that operates the vacuum valve opening and closing mechanism,
A spring for urging the shaft in a direction to close the vacuum valve,
One diaphragm that divides the first chamber and the second chamber and that can reciprocate integrally with the shaft body;
With
A negative pressure detection pipe is provided between the vacuum valve and the suction pipe, and the negative pressure detection pipe and the second chamber are connected via one connection pipe,
The fourth chamber is communicated or shut off with the third chamber by the reciprocating operation of the shaft-like body, and is communicated or interrupted with the outside of the housing,
When a pressure difference is generated between the first chamber and the second chamber on both sides of the diaphragm, the shaft body moves in a direction in which the vacuum valve opens by making the air in the fourth chamber a negative pressure. A vacuum valve control device. A first magnetic force generator attached to a radially outer side of the shaft-like body in the diaphragm;
The first chamber forms the first chamber and is attached to a wall facing the diaphragm to generate a magnetic force attracting the first magnetic force generator. When the first magnetic force generator approaches, the vacuum valve is closed. A second magnetic force generator that closes and opens the vacuum valve when separated from the first magnetic force generator;
The vacuum valve control device according to claim 1, further comprising: A vacuum valve unit comprising the vacuum valve control device according to claim 1 or 2,
A water level detection pipe connected to the first chamber via a first connection pipe;
A suction pipe connected to the second chamber via a second connection pipe and the negative pressure detection pipe,
A vacuum line connected to the third chamber via a third connection pipe, the vacuum line including the vacuum valve connecting the sewage tank and a vacuum tank;
A vacuum valve connected to the fourth chamber via a fourth connection pipe;
A vacuum valve unit comprising: