JP6637365B2 - 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 sewer collection system, a vacuum sewer collection system described in Patent Document 1 is known.

  In the vacuum sewer collection system of Patent Document 1, a line (vacuum system) communicating with a vacuum tank is connected to a vacuum valve unit. The vacuum valve unit includes a suction pipe and a pressure sensor pipe whose first end is disposed in a sewage basin, a vacuum valve disposed between the suction pipe and the line, and a vacuum valve that controls opening and closing operations of the vacuum valve. A control device.

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. The partition wall between the fifth chamber and the sixth chamber, and the wall of the sixth chamber facing the partition wall are provided with a valve seat having a through hole. The shaft reciprocates in the axial direction of the shaft to seal one of the pair of valve seats.
The suction pipe, the pressure sensor pipe, and the vacuum valve are connected to each chamber other than the second chamber of the vacuum valve control device by a flexible tube (connection pipe). The second chamber is open to the outside.

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 basin is higher than a predetermined height, the water level of the sewage in the pressure sensor pipe increases, and the air pressure in the first chamber and the air pressure in the second chamber of the vacuum valve control device become Differences occur. 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 occurs between the pressure of the air in the third room and the pressure of the air in the fourth room due to the sewage flowing in the suction pipe. Thereby, the valve seat is pressed against the valve seat on the wall.

Even if the water level of the sewage drops and the pressure of the air in the first room reaches the atmospheric pressure, the vacuum valve remains open while there is a difference between the air pressure in the third room and the air pressure in the fourth room. Up to.
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 decreases. For this reason, the shaft is moved by the reaction force of the spring, and the valve seat seals the valve seat of the partition wall. The vacuum valve closes and sewage stops flowing through the suction pipe and the like.

JP 2011-196113 A

The vacuum valve control device configured as described above may be used by arranging the vacuum valve control device so that the axial direction of the shaft extends vertically, in other words, the vacuum valve control device stands upright. In this case, the first chamber of the vacuum valve unit is located at the upper side, and the sixth chamber (fourth chamber) is located at the lower side.
However, when sewage, rainwater, or the like flows into the sewage basin and the water level of the sewage or the like rises, the sewage or the like may enter the second chamber that is open to the outside.

  The present invention has been made in view of such a problem, a vacuum valve control device that suppresses infiltration of sewage and the like into the second chamber when the vacuum valve control device is arranged in an upright state, And a vacuum valve unit including the vacuum valve control device.

In order to solve the above problems, the present invention proposes the following means.
The vacuum valve control device of the present invention is arranged between a suction pipe arranged at one end in a sewage basin and a vacuum system for transferring sewage by a vacuum suction force to supply vacuum and atmospheric pressure. A vacuum valve control device that controls a vacuum valve that opens and closes, a vacuum valve opening and closing mechanism that switches between vacuum and atmospheric pressure supplied for opening and closing the vacuum valve, and a reciprocating mechanism that operates the vacuum valve opening and closing mechanism. A shaft body, a spring for urging the shaft body in a direction to close the vacuum valve, a first diaphragm and a second diaphragm that can reciprocate integrally with the shaft body in the axial direction of the shaft body. A diaphragm, a first chamber and a second chamber that generate a differential pressure on both sides of the first diaphragm to move the shaft in a direction to open the vacuum valve, and a differential pressure on both sides of the second diaphragm. Causing the shaft to open the vacuum valve A third chamber and a fourth chamber to be moved in the same direction, the first chamber, the second chamber, the third chamber, and a housing in which the fourth chamber is formed, and a first end portion is the first chamber. An air pipe communicating with the two chambers, extending from the housing toward the outside in the radial direction of the shaft-shaped body, and having, at a second end , an air pipe formed with an opening communicating with the outside, the first chamber; The second chamber, the third chamber, and the fourth chamber are formed in order from the first end of the housing in the axial direction to the second end of the housing , and the second chamber is , Formed in a columnar shape and arranged along the axis, the opening is arranged to be shifted in the axial direction with respect to the first end of the air pipe, and in the second chamber, the end face of the second end side of the housing in the axial direction, said opening, said second end of said housing in said axial direction Is located closer to the axial direction along the vertical direction, the said than said first end of the housing the second end of the housing is arranged such that the lower, of the second chamber It is characterized in that the air pipe is arranged such that the opening of the air pipe is lower than the end face .

  According to the present invention, the vacuum valve control device is arranged in an upright state such that the axial direction of the vacuum valve control device is along the vertical direction and the fourth chamber is located below the first chamber. When the water level of the sewage or the like rises, the sewage or the like tries to enter the air pipe from the opening. However, since the opening of the air pipe is disposed below the inner surface of the second chamber and the air is present in the second chamber, the sewage and the like may exceed the boundary surface with the air in the second chamber. Difficult to move.

Further, in the above-described vacuum valve control device, the air pipe extends from the second chamber toward the outside in the radial direction, and from a radially outer end of the first pipe element. A second piping element extending in the axial direction to approach the second end of the housing and having the opening formed at the end.
According to the present invention, when the vacuum valve control device is arranged in the upright state, a boundary surface between sewage or the like and air in the second chamber is formed at the lower end of the second piping element. Since the second piping element is disposed so as to extend upward from the boundary surface, it is possible to more reliably suppress infiltration of sewage and the like into the second chamber.

Further, the vacuum valve unit of the present invention includes the vacuum valve control device according to any one of the above, a pressure sensor pipe, the suction pipe, the vacuum valve, the pressure sensor pipe, the suction pipe, and the vacuum. A connection pipe that communicates at least one of the valves with the first chamber, the third chamber, and at least one of the fourth chambers, wherein the connection pipe includes the pressure sensor pipe, the suction pipe, and the connection pipe. A first connecting pipe element that communicates with at least one of the vacuum valves, and an end that communicates with at least one of the first chamber, the third chamber, and the fourth chamber and is attachable to an end of the first connecting pipe element; And a second connecting pipe element having a portion.
According to this invention, the separated first connecting pipe element and the second connecting pipe element are arranged on both sides of the plate-like member in which the communication hole is formed. The first connection pipe element and the second connection pipe element are connected through the communication hole of the plate member. Thereby, the connecting pipe can be attached to the communicating hole of the plate-like member as if the connecting pipe was inserted into the communicating hole of the plate-like member.

  ADVANTAGE OF THE INVENTION According to the vacuum valve control apparatus and the vacuum valve unit of this invention, when a vacuum valve control apparatus is arrange | positioned in the upright state, it can suppress that sewage etc. infiltrate into a 2nd chamber.

It is a side view of the vacuum valve unit of one embodiment of the present invention. It is sectional drawing of the side surface which shows the same vacuum valve unit typically. It is a top view which shows the same vacuum valve unit typically. It is the figure which disassembled and showed the connection pipe set of the same vacuum valve unit typically. It is a top view which shows typically the partition plate to which the said connection pipe set is attached. It is sectional drawing of the side surface shown typically for demonstrating the effect | action of the same vacuum valve unit. It is sectional drawing of the side surface shown typically for demonstrating the effect | action of the same vacuum valve unit. It is sectional drawing of the side surface typically shown for demonstrating the effect | action of the same vacuum valve unit when the water level of sewage etc. becomes high.

Hereinafter, an embodiment of a vacuum valve unit according to the present invention will be described with reference to FIGS.
FIG. 1 shows the sizes and shapes of a sewage chamber 101, a vacuum valve 12, a vacuum valve control device 21, and the like, which will be described later, relatively more accurately than those shown in FIG. FIG. 2 et seq. Schematically shows the size and shape of the sewage tank 101 and the like adjusted for convenience of explanation.
As shown in FIGS. 1 and 2, the present vacuum valve unit 1 is connected to a pressure sensor pipe (pressure detection pipe) 10, a suction pipe 11, a vacuum valve 12, and a vacuum valve control device 21 of the present embodiment. Pipes 61, 62, 63, 64, 65.
A first end of the pressure sensor pipe 10 and a first end of the suction pipe 11 are disposed in a sewage trough 101 buried in the ground G. The upper opening of the sewage trough 101 is covered with a lid 101a.

  The vacuum valve control device 21 controls the above-described vacuum valve 12 disposed between the suction pipe 11 and a line (vacuum system) 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 urging spring (spring) 24, a first diaphragm 25, a second diaphragm 26, A first chamber 27, a second chamber 28, a third chamber 29, and a fourth chamber 30 are provided.

In the present embodiment, as shown in FIGS. 2 and 3, the casing 22 has a main body 33 formed in a cylindrical shape, and a lid 35 attached to the main body 33 with bolts 34. The plurality of bolts 34 are arranged at intervals around the axis C of the shaft 23 which is the axis of the main body 33.
In the casing 22, a first partition 37, a second partition 38, and a third partition 39 are formed in order from the first end 22a to the second end 22b in the direction of the axis C of the casing 22 at intervals from each other. I have.
The casing 22 is arranged such that the second end 22b is lower Z1 than the first end 22a. That is, the casing 22 is arranged so that the direction along the axis of the main body 33 is the vertical direction.

  The above-mentioned first diaphragm 25 is arranged at an intermediate portion in the direction of the axis C of the internal space formed between the lid 35 and the first partition 37. The first diaphragm 25 includes a first chamber 27 that is an internal space far from the second end 22b of the casing 22 and a second chamber 28 that is an internal space close to the second end 22b of the casing 22, Partition into Since the pressure of the air in the first chamber 27 is higher than the pressure of the air in the second chamber 28, the first chamber 27 and the second chamber 28 generate a differential pressure on both sides of the first diaphragm 25, The shaft 23 is moved in a direction to open the vacuum valve 12. The direction in which the vacuum valve 12 is opened is a direction from the first end 22a of the casing 22 toward the second end 22b, that is, the lower direction Z1.

An air pipe 41 whose first end communicates with the second chamber 28 and whose second end opens to the outside communicates with the second chamber 28. The air piping 41 includes a first piping element 42 extending radially outward of the shaft 23, and a second piping element 43 extending in the direction of the axis C from a radially outer end of the first piping element 42. Have. The second piping element 43 extends close to the second end 22b of the casing 22, that is, extends downward Z1. An opening 43a is formed at an end of the lower part Z1 of the second piping element 43, that is, at a tip end in a direction in which the second piping element 43 extends. The first piping element 42 and the second piping element 43 are formed of a resin such as polyethylene or a metal.
The second chamber 28 communicates with outside air via an air pipe 41. The second chamber 28 does not communicate with outside air or other members other than the air pipe 41.
In the direction of the axis C, the opening 43a of the air pipe 41 is closer to the second end 22b of the casing 22 than to the inner surface 28a of the second chamber 28 that is closer to the second end 22b of the casing 22. In other words, the opening 43a of the air pipe 41 is located below the inner surface 28a of the second chamber 28 below Z1.

The first diaphragm 25 is formed in a disc shape with an elastic material such as rubber.
A permanent magnet 45 is attached to the outer surface of the lid 35 near the first chamber 27. The permanent magnet 45 is mounted on the axis C. The permanent magnet 45 is in contact with the upper surface of the first diaphragm 25.
A first shaft 23a constituting the shaft 23 is fixed to the first diaphragm 25 so as to extend downward Z1 from the first diaphragm 25. That is, the first diaphragm 25 reciprocates in the direction of the axis C integrally with the first shaft 23a. The first shaft 23a is not fixed to the first partition 37, but 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 first shaft 23a, there is provided a seal mechanism whose reference numeral is omitted.
The first shaft 23a is inserted into the first shaft urging spring 24a constituting the shaft urging spring 24. The first shaft urging spring 24a urges the first shaft 23a and the first diaphragm 25 with respect to the main body 33 in a direction in which the vacuum valve 12 described later is closed, that is, in the upward direction Z2.
The end of the first shaft 23a is in contact with the upper surface of the second diaphragm 26.

  The above-mentioned second diaphragm 26 is disposed at an intermediate portion of the internal space formed between the first partition 37 and the second partition 38 in the direction of the axis C. The second diaphragm 26 divides this internal space into a third chamber 29 which is an internal space close to the first end 22a of the casing 22, and a fourth chamber 30 which is an internal space close to the second end 22b of the casing 22, Partition into Since the pressure of the air in the third chamber 29 is higher than the pressure of the air in the fourth chamber 30, the third chamber 29 and the fourth chamber 30 generate a differential pressure on both sides of the second diaphragm 26, The shaft 23 is moved downward Z1.

A second shaft 23b constituting the shaft 23 is fixed to the second diaphragm 26 so as to extend downward Z1 from the second diaphragm 26. That is, the second diaphragm 26 reciprocates in the direction of the axis C integrally with the second shaft 23b. The second shaft 23b is not fixed to the second partition 38, but passes through the second partition 38 so as to be movable in the direction of the axis C with respect to the second partition 38. Between the second partition wall 38 and the second shaft 23b, a seal mechanism whose reference numeral is omitted is provided. The second shaft 23b and the above-described first shaft 23a are formed of, for example, stainless steel having ferromagnetic properties.
The second shaft 23b is inserted into a second shaft urging spring 24b constituting the shaft urging spring 24. The second shaft urging spring 24b urges the second shaft 23b and the second diaphragm 26 upward Z2.

Below the fourth chamber 30 in the main body 33, a fifth chamber 50 and a sixth chamber 51 are formed. That is, the first chamber 27, the second chamber 28, the third chamber 29, the fourth chamber 30, the fifth chamber 50, and the sixth chamber 51 are provided inside the casing 22 at the first end of the casing 22 in the direction of the axis C. From the part 22a to the second end 22b, they are formed in order from the first chamber 27 to the sixth chamber 51. A fifth chamber 50 is formed in the main body 33 at a position opposite to the fourth chamber 30 with the second partition 38 interposed therebetween. A sixth chamber 51 is formed in the main body 33 at a position opposite to the fifth chamber 50 with the third partition wall 39 interposed therebetween. The vacuum valve control device 21 is arranged in an upright state such that the sixth chamber 51 (the fourth chamber 30) is located below the first chamber 27 of the casing 22 at the lower side Z1.
In the third partition wall 39, a valve seat 53 having a through hole is arranged on the axis C.
A valve seat 54 having a through-hole 54 a is arranged on the axis C in a wall portion of the main body 33 facing the third partition wall 39. The valve seat 54 is disposed below the valve seat 53 at Z1. The sixth chamber 51 communicates with the outside air by the through hole 54 a of the valve seat 54.

A valve body 56 is fixed to an end of the second shaft 23b disposed in the sixth chamber 51. The fifth chamber 50, the sixth chamber 51, the valve body 56, and the through-hole 54a constitute a vacuum valve opening / closing mechanism 55 that switches between vacuum and atmospheric pressure supplied for opening / closing the vacuum valve 12. The shaft 23 having the shafts 23a and 23b operates the vacuum valve opening / closing mechanism 55 by reciprocating in the direction of the axis C as described later.
When the second shaft 23b moves upward Z2 and the valve body 56 comes into contact with the valve seat 53, the through hole of the valve seat 53 is sealed by the valve body 56. At this time, since the through hole 54a of the valve seat 54 is not sealed, the sixth chamber 51 communicates with the outside air.
On the other hand, when the second shaft 23b moves downward Z1 and the valve body 56 comes into contact with the valve seat 54, the through hole 54a of the valve seat 54 is sealed by the valve body 56. At this time, the fifth chamber 50 and the sixth chamber 51 communicate with each other because the through hole of the valve seat 53 is not sealed.

As shown in FIG. 2, the suction pipe 11 has a first suction pipe element 11d in a lower part Z1 and a second suction pipe element 11e in an upper part Z2. At the ends of the suction pipe elements 11d and 11e, inter-element connections for fusion, adhesion, flange connection, screwing, insertion, etc. are provided, although not shown. With these inter-element connections, the end of the second suction pipe element 11e can be easily attached to the end of the first suction pipe element 11d. When the first suction pipe element 11d and the second suction pipe element 11e are attached, the connection between the first suction pipe element 11d and the second suction pipe element 11e is hermetically sealed.
In the first suction pipe element 11d, communication holes 11a and 11b are formed at intervals in a vertical direction which is a longitudinal direction of the first suction pipe element 11d. The communication hole 11a is formed above Z2 above the communication hole 11b. An air suction pipe 11c communicating with the outside air is provided between a connection portion of the second suction pipe element 11e with the line 103 and an inter-element connection portion.

  The above-described connecting pipe 61 has a first connecting pipe element 61 a communicating with the communication hole 11 a of the suction pipe 11, and a second connecting pipe element 61 b communicating with the fourth chamber 30. Similarly, the connecting pipe 62 has a first connecting pipe element 62 a communicating with the communication hole 11 b of the suction pipe 11 and a second connecting pipe element 62 b communicating with the third chamber 29. The connection pipe 63 has a first connection pipe element 63 a communicating with the pressure sensor pipe 10 and a second connection pipe element 63 b communicating with the first chamber 27.

As shown in FIG. 4, the pressure sensor pipe 10, the first suction pipe element 11d, and the first connection pipe elements 61a, 62a, 63a are integrated to form a first connection pipe set 67a. The first connection pipe set 67a can be formed of a resin such as polyethylene. Similarly, the second connecting pipe elements 61b, 62b, 63b are integrated to form a second connecting pipe set 67b. The second connection pipe set 67b can be formed similarly to the first connection pipe set 67a.
The first connection pipe set 67a and the second connection pipe set 67b constitute a connection pipe set 67.
At the ends of the connecting pipe elements 61a, 62a, 63a, 61b, 62b, 63b, the above-described inter-element connecting portions are provided. The end of the second connection pipe set 67b can be easily attached to the end of the first connection pipe set 67a.

  As shown in FIGS. 2 and 5, the connection between the elements of the first connection pipe set 67 a and the second connection pipe set 67 b of the connection pipe set 67 is a partition plate (plate-like member) attached to the sewage chamber 101. 105 are arranged in the communication hole 105a. The partition plate 105 is used as a scaffold for the user.

As shown in FIG. 2, the vacuum valve 12 has a diaphragm 12b arranged in a piston chamber 12a, and a vacuum valve spring 12c for urging the diaphragm 12b. A valve element 12d is fixed to the 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 is the atmospheric pressure PM as described later, the spring 12c for the vacuum valve is extended, and the valve body 12d is connected to the suction pipe 11 by a line. It comes into contact with the connection portion with 103. Thus, the suction pipe 11 and the line 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 is at a negative pressure (vacuum) PL as described later, the vacuum valve spring 12c contracts, and the valve body 12d moves between the suction pipe 11 and the line 103. Away from the connection. As a result, the suction pipe 11 and the line 103 are in communication with each other, and the vacuum valve 12 is opened.
Thus, the vacuum valve 12 opens and closes by supplying vacuum and atmospheric pressure into the piston chamber 12a.

The connection pipe 64 communicates with the piston chamber 12a and the sixth chamber 51. The connection pipe 65 communicates with the line 103 and the fifth chamber 50.
Note that the connection pipes 64 and 65 may be configured by a first connection pipe element and a second connection pipe element having an end attachable to an end of the first connection pipe element, like the connection pipe 61. Good.

Next, a procedure for attaching the connecting pipe set 67 of the vacuum valve unit 1 configured as described above to the partition plate 105 will be described.
The separated first connecting pipe set 67a and the second connecting pipe set 67b are arranged on both sides of the partition plate 105. The first connection pipe set 67a and the second connection pipe set 67b are connected (attached) through the communication holes 105a of the partition plate 105. Specifically, for example, the inter-element connection at the end of the first connection pipe element 61a and the inter-element connection at the end of the second connection pipe element 61b are connected.
Thus, the connecting pipe set 67 is attached to the communication hole 105a of the partition plate 105 as if the connecting pipe set 67 was inserted into the communication hole 105a of the partition plate 105.
The partition plate 105 to which the connecting pipe set 67 is attached is attached to the sewage tank 101.

Next, the operation of the vacuum valve unit 1 will be described.
In FIG. 2, the water level of the sewage W in the sewage tank 101 is relatively low. The pressure of the air in the pressure sensor tube 10, the pressure of the air in the first chamber 27, and the pressure of the air in the second chamber 28 are atmospheric pressure PM. In the following, air at a positive pressure PH (pressure 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 indicated by gray dots of a medium density between relatively dark gray and relatively light gray. Since the inside of the second chamber 28 is always the atmospheric pressure PM, the description of the dots is omitted. In the third chamber 29 and the fourth chamber 30, the description of dots is omitted.

In FIG. 2, since the waste water W does not flow in the suction pipe 11, there is no air pressure difference between the third chamber 29 and the fourth chamber 30. The shafts 23a and 23b are moved upward Z2 by the urging force of the shaft urging springs 24a and 24b and the magnetic force acting on the permanent magnet 45 and the first shaft 23a.
Therefore, the valve body 56 is in contact with the valve seat 53. Since the through hole 54a of the valve seat 54 is not sealed, the pressure of the air in the sixth chamber 51 is the atmospheric pressure PM. The pressure of the air in the piston chamber 12a communicating with the sixth chamber 51 via the connection pipe 64 is the atmospheric pressure PM.

Since the inside of the line 103 communicates with a vacuum tank (not shown), the pressure of the air in the line 103 is a negative pressure PL. The diaphragm 12b of the vacuum valve 12 approaches the connection between the suction pipe 11 and the line 103 due to the pressure difference between the piston chamber 12a and the line 103. The vacuum valve spring 12c is extended, and the vacuum valve 12 is closed.
The pressure of the air in the fifth chamber 50 communicating with the line 103 via the connection pipe 65 is a negative pressure PL.

When the water level of the sewage W in the sewage tank 101 rises from the state of FIG. 2, the vacuum valve control device 21 performs a vacuum valve opening process described below. As shown in FIG. 6, the pressure of the air in the pressure sensor tube 10 increases, and becomes positive pressure PH. The pressure of the air in the first chamber 27 that communicates with the pressure sensor pipe 10 via the connection pipe 63 becomes a positive pressure PH.
Due to the pressure difference between the first chamber 27 and the second chamber 28, the diaphragms 25 and 26 are driven by the shafts against the urging force of the shaft urging springs 24a and 24b and the magnetic force acting on the permanent magnet 45 and the first shaft 23a. It moves downward Z1 together with 23a and 23b. At this time, the air in the second chamber 28 flows out through the air pipe 41 to the outside as the internal volume of the second chamber 28 decreases.
The valve body 56 is separated from the valve seat 53, and the valve body 56 contacts the valve seat 54. Since the through hole of the valve seat 53 is not sealed, the fifth chamber 50 and the sixth chamber 51 communicate with each other. The pressure of the air in the sixth chamber 51 and the pressure of the air in the piston chamber 12a communicating with the sixth chamber 51 via the connection pipe 64 become the negative pressure PL. The vacuum valve spring 12c contracts and the vacuum valve 12 opens.

When the pressure of the air in the suction pipe 11 becomes the negative pressure PL, the sewage W flows through the suction pipe 11 and the line 103. At this time, the air flowing into the suction pipe 11 through the air suction pipe 11c and the sewage W are mixed.
The flow of the sewage W into the suction pipe 11 causes the pressure of the air in the connection pipe 62 and the third chamber 29 to be higher than the pressure of the air in the connection pipe 61 and the fourth chamber 30. The second diaphragm 26 and the second shaft 23b are pressed further downward Z1.
The sewage W flows into the suction pipe 11, and the surface of the sewage W drops to the position L1. At this time, as shown in FIG. 7, the pressure of the air in the pressure sensor tube 10 and the pressure of the air in the first chamber 27 become the atmospheric pressure PM, and the air in the chambers 27 and 28 on both sides of the first diaphragm 25 is changed. Are approximately equal. The first shaft 23a and the first diaphragm 25 move upward Z2 by the urging force of the first shaft urging spring 24a. The permanent magnet 45 contacts the upper surface of the first diaphragm 25. At this time, as the internal volume of the second chamber 28 increases, external air flows into the second chamber 28 through the air pipe 41.

  Due to the pressure difference between the inside of the third chamber 29 and the inside of the fourth chamber 30, the second diaphragm 26 and the second shaft 23b are pressed downward Z1 as shown in FIG. 6, and the valve body 56 remains in contact with the valve seat 54. It is.

As shown in FIG. 7, it will be described below that the position L2 of the water surface of the sewage W is located below the first end of the suction pipe 11 at Z1 and the first end of the suction pipe 11 sucks air. A vacuum valve closing step is performed.
The pressure of the air in the third chamber 29 and the pressure of the air in the fourth chamber 30 become substantially equal. The second shaft 23b and the second diaphragm 26 move upward Z2 by the urging force of the second shaft urging spring 24b. The valve body 56 is separated from the valve seat 54, and the valve body 56 contacts the valve seat 53. Since the through hole 54a of the valve seat 54 is not sealed, the pressure of the air in the sixth chamber 51 becomes the atmospheric pressure PM. The pressure of the air in the piston chamber 12a communicating with the sixth chamber 51 via the connection pipe 64 becomes the atmospheric pressure PM. The vacuum valve 12 closes.

When the water level of the sewage W in the sewage tank 101 rises again, the vacuum valve opening step and the vacuum valve closing step described above are performed, and the sewage W in the sewage tank 101 flows into the suction pipe 11.
As described above, normally, the vacuum valve 12 is automatically closed or opened under the control of the vacuum valve control device 21.

Here, a case will be described in which the amount of the sewage W flowing into the sewage tank 101 becomes extremely large or rainwater flows into the sewage tank 101, and the water level of the sewage W in the sewage tank 101 becomes high.
As shown in FIG. 8, when the position L3 of the water surface of the sewage W or the like becomes Z2 above the opening 43a of the air pipe 41, the sewage W or the like tends to enter the air pipe 41 from the opening 43a. However, since the opening 43a of the air pipe 41 is located below the inner surface 28a of the second chamber 28 and the air exists in the second chamber 28, the waste water W and the like are present in the second chamber 28. It is difficult to move upward Z2 beyond the boundary surface S with the air. For this reason, the sewage W and the like hardly enter the second chamber 28 through the air pipe 41.

Since the air pipe 41 has the second pipe element 43 extending in the direction of the axis C, the sewage W or the like on the boundary surface S moves upwards Z2 beyond the length of the second pipe element 43 and enters the first pipe element 42. Hard to penetrate.
In the present embodiment, the internal volume of the second piping element 43 may be equal to or larger than the change amount of the internal volume of the second chamber 28. The amount of change in the internal volume of the second chamber 28 may be used as the internal volume of the second chamber 28 in the state of FIG. With this configuration, even if the internal volume of the second chamber 28 increases after the position L3 of the water surface of the sewage W becomes Z2 above the opening 43a of the air pipe 41, Sewage W and the like hardly enter the chamber 28.

  As described above, according to the vacuum valve control device 21 of the present embodiment, the water level of the sewage W or the like becomes Z2 above the opening 43a of the air pipe 41 by disposing the vacuum valve control device 21 in the upright state. In this case, sewage W or the like tends to enter the air pipe 41 from the opening 43a. However, since the opening 43a of the air pipe 41 is disposed below the inner surface 28a of the second chamber 28 and the air is present in the second chamber 28, the sewage W and the like exceed the boundary surface S, It is difficult to move to Z2. Therefore, even if the vacuum valve control device 21 is arranged in the upright state, it is possible to suppress the infiltration of the sewage W or the like into the second chamber 28.

The vacuum valve control device 21 and the connection pipes 61 and 62 can be connected without providing an intervening material such as a rubber block between the vacuum valve control apparatus 21 and the connection pipes 61 and 62.
Since the second pipe element 43 of the air pipe 41 is disposed so as to extend upward Z2 from the boundary surface S, the infiltration of the sewage W or the like into the second chamber 28 can be suppressed more reliably.

In the vacuum valve unit of Patent Document 1, since the connecting pipe is integrally formed, the following procedure is performed when the connecting pipe is installed in the communication hole of the partition plate. That is, a notch extending from the edge of the partition plate to the communication hole is formed. The connecting pipe is arranged in the communication hole through the notch of the partition plate. A cover plate is attached to the partition plate in order to cover the portion where the notch is formed in the partition plate.
On the other hand, according to the vacuum valve unit 1 of the present embodiment, the connection pipe 61 has the first connection pipe element 61a and the second connection pipe element 61b. For this reason, when attaching the connecting pipe 61 to the communication hole 105a of the partition plate 105, the connection pipe 61 can be easily attached without forming a notch extending from the edge of the partition plate 105 to the communication hole 105a.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration can be changed, combined, or deleted without departing from the gist of the present invention. Etc. are also included.
For example, in the above embodiment, the air pipe may be formed in an oblique straight pipe shape so as to extend downward Z1 from the second chamber 28 toward the outside in the radial direction.
Although the number of connecting pipes constituting the connecting pipe set is three, any number may be used as long as it is one or more.

DESCRIPTION OF SYMBOLS 1 Vacuum valve unit 10 Pressure sensor pipe 11 Suction pipe 12 Vacuum valve 21 Vacuum valve control device 22 Casing (housing)
23 Shaft (shaft)
24 Shaft biasing spring (spring)
25 first diaphragm 26 second diaphragm 27 first chamber 28 second chamber 29 third chamber 30 fourth chamber 41 air pipe 42 first pipe element 43 second pipe element 43a opening 61, 62, 63 connecting pipe 61a, 62a, 63a First connecting pipe element 61b, 62b, 63b Second connecting pipe element 101 Sewage tank 103 Line (vacuum system)
C axis W Sewage

Claims (3)

The first end is disposed between a suction pipe arranged in a sewage basin and a vacuum system for transferring sewage by vacuum suction, and a vacuum for controlling a vacuum valve that opens and closes by supplying vacuum and atmospheric pressure. A valve control device,
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 that biases the shaft in a direction to close the vacuum valve,
A first diaphragm and a second diaphragm that can reciprocate integrally with the shaft in the axial direction of the shaft,
A first chamber and a second chamber for generating a differential pressure on both sides of the first diaphragm to move the shaft in a direction to open the vacuum valve,
A third chamber and a fourth chamber for generating a differential pressure on both sides of the second diaphragm to move the shaft in a direction to open the vacuum valve,
The first chamber, the second chamber, the third chamber, and a housing in which the fourth chamber is formed,
An air pipe in which a first end communicates with the second chamber, extends from the housing toward the outside in the radial direction of the shaft-like body, and has an opening formed in the second end to communicate with the outside,
With
The first chamber, the second chamber, the third chamber, and the fourth chamber are formed in order from the first end of the housing in the axial direction to the second end of the housing ,
The second chamber is formed in a cylindrical shape and is disposed along the axis,
The opening is displaced in the axial direction with respect to the first end of the air pipe,
In the second chamber, the end face of the second end side of the housing in the axial direction, said opening being located closer to said second end of said housing in the axial direction,
The axial direction is along the vertical direction, the second end of the housing is disposed below the first end of the housing,
The vacuum valve control device , wherein the opening of the air pipe is disposed below the end surface of the second chamber . The air piping is
A first piping element extending outward from the second chamber in the radial direction,
A second piping element extending from the radially outer end of the first piping element in the axial direction to approach the second end of the housing, and the opening is formed at the end,
The vacuum valve control device according to claim 1, further comprising: The vacuum valve control device according to claim 1 or 2,
A pressure sensor tube,
Said suction tube;
Said vacuum valve;
The pressure sensor pipe, the suction pipe, and a connection pipe that communicates at least one of the vacuum valve and the first chamber, the third chamber, and at least one of the fourth chamber,
With
The connecting pipe,
A first connection pipe element that communicates with at least one of the pressure sensor pipe, the suction pipe, and the vacuum valve;
A second connecting pipe element having an end that is in communication with at least one of the first chamber, the third chamber, and the fourth chamber and that can be attached to an end of the first connecting pipe element;
A vacuum valve unit comprising: