JP5123803B2 - Vacuum valve control device - Google Patents

Description

  The present invention relates to a vacuum valve control device that controls opening and closing of a vacuum valve.

  In recent years, the use of vacuum sewer systems that collect sewage accumulated in sewage by vacuum pressure instead of natural flow sewer systems is increasing.

  In this vacuum sewer system, sewage discharged from residences and factories is stored in sewage sewage with a vacuum valve, and when a predetermined amount is stored, it is taken into the vacuum sewage pipe as a gas-liquid mixed flow together with air by the vacuum pressure. Are transported.

  This vacuum sewer system includes a vacuum station, a vacuum pipe line, a vacuum valve unit, and the like, and a vacuum valve, a vacuum valve control device that opens and closes the vacuum valve, and the like are arranged in the vacuum valve unit.

  As such a vacuum valve control device, for example, in Patent Document 1, a small-diameter through hole is provided so as not to be elastically deformed by a gradual increase in pressure in the water level detection tube, and a peripheral edge is caused by a sudden increase in pressure in the pressure adjustment chamber. The structure provided with the damping diaphragm which can release a pressure from a part is disclosed.

Accordingly, the vacuum valve can be quickly closed after the liquid in the storage tank is discharged by the vacuum pressure.
Japanese Patent No. 2740110

  By the way, in the above-mentioned Patent Document 1, a detection space in which a detection diaphragm that is elastically deformed by pressure fluctuation in a water level detection tube that detects liquid level fluctuation is arranged, and a switching space in which a switching diaphragm that is elastically deformed by vacuum pressure is arranged. , Was communicated.

  Therefore, when the vacuum valve is closed, there is a possibility that the air in the detection space is sucked into the switching space and the detection diaphragm is elastically deformed so that the vacuum valve is opened again (so-called chattering).

  Accordingly, an object of the present invention is to provide a vacuum valve control device that can prevent chattering.

  In order to achieve the above object, the vacuum valve control device of the present invention is connected to a vacuum valve provided between a vacuum exhaust pipe that is in a vacuum state and a suction pipe that sucks the liquid in the storage tank by vacuum pressure. A vacuum valve control device that opens and closes the vacuum valve according to a liquid level fluctuation of the liquid, and a detection space in which a detection diaphragm that is elastically deformed by a pressure fluctuation in a water level detection pipe that detects the liquid level fluctuation is disposed; A detection valve that is opened and closed by movement of a plunger accompanying elastic deformation of the detection diaphragm, a switching space in which a switching diaphragm that is elastically deformed by vacuum pressure introduced by opening and closing the detection valve is disposed, and elastic deformation of the switching diaphragm And a switching valve that selectively moves a vacuum pressure or an atmospheric pressure to the vacuum valve, and includes the detection space and the switching space. Characterized in that it is separated without being communicated.

  Further, the side of the detection space that does not communicate with the water level detection pipe communicates with the outside, and the side of the switching space where the vacuum pressure is introduced communicates with the control breather pipe that introduces atmospheric pressure through the pores. can do.

  Furthermore, it is preferable that the diameter of the pore is smaller than the diameter of the branch path for introducing a vacuum pressure from the vacuum exhaust pipe to the switching space.

  The diameter of the pore is preferably formed to be equal to or smaller than a diameter at which the switching diaphragm can be elastically deformed to introduce the vacuum pressure into the vacuum valve when a critical vacuum pressure at which the vacuum valve operates is applied. .

  The control breather pipe may be provided with a speed adjustment valve that adjusts the introduction speed of the atmospheric pressure introduced through the switching valve.

  As described above, the vacuum valve control device of the present invention includes the detection space, the detection valve, the switching space, and the switching valve, and is characterized in that the detection space and the switching space are separated without being communicated.

  Therefore, when the vacuum valve is closed, the air on the side of the detection space that does not communicate with the water level detection pipe is sucked into the switching space, the detection diaphragm is elastically deformed, the detection valve is opened, and the vacuum valve is opened again. (So-called chattering) can be prevented.

  In addition, the side of the detection space that does not communicate with the water level detection pipe communicates with the outside, and the side of the switching space where the vacuum pressure is introduced communicates with the control breather pipe that introduces atmospheric pressure through the pores, thereby causing chattering. In addition, the atmospheric pressure can be introduced into the vacuum valve even when the outside is filled with liquid.

  Furthermore, the pore diameter is smaller than the diameter of the branch path that introduces the vacuum pressure from the vacuum discharge pipe to the switching space, so that the atmospheric pressure can be introduced with the detection valve closed, and the detection valve The vacuum pressure can be efficiently introduced in a state where is opened.

  The pore diameter is less than the diameter at which the switching diaphragm can be elastically deformed and vacuum pressure can be introduced into the vacuum valve when the critical vacuum pressure at which the vacuum valve operates is applied. It becomes a vacuum valve control device suitable for.

  Further, the control breather pipe is provided with a speed adjustment valve for adjusting the introduction speed of the atmospheric pressure introduced through the switching valve, so that the amount of air mixed with the liquid when the vacuum valve is closed can be adjusted.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the whole structure of the vacuum-type sewer system S provided with the vacuum valve unit U in which the vacuum valve control apparatus 2 of this invention was installed is demonstrated using FIG.

  In the vacuum sewer system S of the present invention, as shown in FIG. 2, the sewage discharged from the home or factory flows into the vacuum valve unit U through the natural flow down pipe 92.

  Subsequently, the sewage flowing into the vacuum valve unit U is caused by a vacuum pressure generated by the sewage circulation pump 96a of the vacuum station 96 (a pressure lower than the atmospheric pressure), and the lower part 93 as a vacuum sewage pipe. It is transported as a gas-liquid mixed flow so as to sequentially pass through the lift unit 94.

  This ejector-type vacuum station 96 supplies sewage in the receiving tank to the ejector 96c by a sewage circulation pump 96a, and keeps the inside of the vacuum sewage pipe at a vacuum state of about 0.4 atm. Collect by sucking.

  The above-mentioned vacuum sewer system S is a system that forcibly collects and conveys sewage by the differential pressure between vacuum and atmospheric pressure, and the embedding depth of the vacuum sewage pipe is shallow, and it is easy to avoid buried objects. Sewage with vacuum valve has features such as no power supply, no leakage of sewage, no need to clean pipes, and less scum.

  As shown in FIG. 3, the vacuum valve unit U has a vacuum discharge pipe 51 connected to a vacuum sewage pipe and brought into a vacuum state, an inflow pipe 56 for allowing sewage to flow into the main body of the vacuum valve unit U. A storage tank 52 that receives and temporarily stores sewage, a suction pipe 53 that is inserted into the stored sewage and takes the sewage into the vacuum discharge pipe 51, and is inserted into the stored sewage and has a liquid level in the storage tank 52. A water level detection pipe 54 that detects fluctuations, a ventilation pipe 55 that supplements air after sewage sucked into the vacuum sewage pipe due to vacuum pressure, a maintenance valve 57 that closes so that vacuum pressure does not act during maintenance, etc. It is buried in the ground.

  Furthermore, the vacuum valve unit U of the present embodiment is evacuated by the pressure fluctuation caused by the liquid level fluctuation in the vacuum valve 1 provided between the vacuum exhaust pipe 51 and the suction pipe 53 and the water level detection pipe 54. And a vacuum valve controller 2 as a vacuum valve control device for opening and closing the valve 1.

  As shown in FIG. 4, the vacuum valve controller 2 is fixed to the upper part of the vacuum valve 1, and passes through the vacuum valve connection port 214 to the spring side space 18 formed in the main body cylinder portion 10 of the vacuum valve 1. It is connected to selectively introduce atmospheric pressure or vacuum pressure.

  The vacuum valve 1 includes a flow passage portion 11 that is inserted and installed between a vacuum exhaust pipe 51 and a suction pipe 53, a valve hole 12 formed in the flow passage portion 11, a cylindrical container-like main body tubular portion 10, an elastic member. A rolling diaphragm 17 formed to be deformable by the body and isolating the inside of the main body cylinder part 10 into a spring side space 18 and a flow path side space 19; a spring 16 for biasing the rolling diaphragm 17 toward the flow path part 11; A rod 14 that moves according to deformation and movement of the rolling diaphragm 17, a valve body 13 that is attached to the tip of the rod 14 and closes the valve hole 12, and the like are provided.

  Therefore, when a vacuum pressure is introduced into the spring-side space 18 through the vacuum valve connection port 214, the rolling diaphragm 17 is elastically deformed so that the rod 14 and the valve body 13 are moved toward the spring 16 against the urging force of the spring 16. The valve hole 12 formed in the flow path portion 11 is drawn (opened state), and the vacuum pressure is introduced into the suction pipe 53 to suck the sewage.

  On the other hand, when the atmospheric pressure is introduced into the spring-side space 18 through the vacuum valve connection port 214, the rod 14 and the valve body 13 are pressed against the flow path portion 11 side by the urging force of the spring 16 and formed in the flow path portion 11. The valve hole 12 is closed (the valve is closed), and the vacuum pressure is not introduced into the suction pipe 53.

  As shown in FIGS. 1 and 3, the vacuum valve controller 2 serving as a vacuum valve control device is connected to a water level detection pipe 54 via a silicon tube 61 as a connecting means that communicates with the outside of the main body. Breather pipe for control which introduces atmospheric pressure through the vacuum pressure connection port 212 connected to the vacuum pressure side of the flow path part 11 of the vacuum valve 1 through the silicon tube 62 and the silicon tube 63. An atmospheric pressure connection port 213 connected to 65 is provided.

  This control breather pipe 65 is installed to take air into the vacuum valve 1 or the vacuum valve controller 2, and one end is connected to the vacuum valve 1 or the vacuum valve controller 2, and the other end is opened to the ground. .

  In the middle of the portion of the control breather pipe 65 that protrudes to the ground, the inside of the control breather pipe 65 is used to adjust the opening / closing speed of the vacuum valve 1 by changing the amount of air flowing into the vacuum valve 1. A speed adjustment valve 3 for continuously changing the empty cross-sectional area is provided.

  Further, as shown in FIGS. 1 and 5, the vacuum valve controller 2 includes a detection diaphragm 22 that is elastically deformed by pressure fluctuation in the water level detection pipe 54 that detects liquid level fluctuation, and a detection diaphragm 22, as shown in FIGS. Detection space 23, a plunger 24 that moves with elastic deformation of the detection diaphragm 22, a detection valve 25 that is opened and closed by the movement of the plunger 24, and a vacuum pressure that is introduced by opening and closing the detection valve 25. A switching diaphragm 26, a switching space 27 in which the switching diaphragm 26 is disposed, and a switching valve 28 that is moved in accordance with elastic deformation of the switching diaphragm 26 are provided.

  The detection diaphragm 22 is formed in a thin dish shape by an elastically deforming resin, and the peripheral edge portion is fitted into the housing, and a disk member is in contact with the back surface to maintain the shape at the time of deformation.

  Further, a plunger 24 protrudes from the center of the disk member on the back surface, and a spring for pushing back the plunger 24 and the detection diaphragm 22 is fitted at the base of the plunger 24.

  The detection space 23 is divided by the detection diaphragm 22, communicated with the water level detection pipe 54 through the water level detection pipe connection port 211, and pressurized through the external connection port 215 with a pressurized space 23 a that is pressurized to atmospheric pressure or higher. An atmospheric pressure space 23b which is outside the valve controller 2 and communicates with the inside of the vacuum valve unit U is formed.

  The external connection port 215 is provided on the bottom surface side of the atmospheric pressure space 23b, and is formed to have a diameter substantially the same as the diameter of the water level detection pipe connection port 211 so that no pressure is generated when the detection diaphragm 22 is deformed. Is preferred.

  Furthermore, the plunger 24 is formed in a rod shape with resin, and protrudes from the center of the disk member in contact with the back surface side (atmospheric pressure space 23b side) of the detection diaphragm 22 in the back surface direction.

  The detection valve 25 is for selectively introducing a vacuum pressure or an atmospheric pressure into the switching space 27. The detection valve 25 is formed in a plate spring shape that can be folded back by metal or the like, and the vacuum pressure is applied through the vacuum pressure connection port 212. The branch path 292 branched from the introduced vacuum pressure path 291 is attached so that it can be opened and closed.

  Further, the switching diaphragm 26 is formed in a thin dish shape by an elastically deforming resin, the peripheral edge portion is fitted into the housing, and a disk member is brought into contact with the front surface and the rear surface to maintain the shape at the time of deformation. Yes.

  Further, the switching space 27 is divided by the switching diaphragm 26, communicates with the vacuum pressure path 291 through the branch path 292, and communicates with the atmospheric pressure path 294 through the pores 216, and the atmospheric pressure path. An atmospheric pressure space 27c communicating with the outside through 294 is formed.

  When the vacuum pressure is introduced from the branch path 292, the diameter of the pore 216 is branched to prevent the switching valve 28 from operating due to a short circuit of air taken in from the atmospheric pressure path 294 side. It is formed smaller than the diameter of the path 292.

  In addition, the diameter of the pores 216 is equal to or smaller than the diameter that is activated when the limit vacuum pressure is applied so that the switching valve 28 is activated even when the minimum limit vacuum pressure at which the vacuum valve 1 is activated is activated. Is formed.

  The switching valve 28 is for selectively introducing a vacuum pressure or an atmospheric pressure into the selective sealing space 293, and is formed in a rod shape with a three-way valve attached to the tip, and on the back side of the switching diaphragm 26. It protrudes from the center toward the bottom.

  Therefore, the switching valve 28 moves according to the deformation / movement of the switching diaphragm 26, thereby bringing the three-way valve into contact with the atmospheric pressure sealing packing 295 or the vacuum pressure sealing packing 296, and through the vacuum valve connection port 214. A vacuum pressure or atmospheric pressure is introduced into the vacuum valve 1.

  And in the vacuum valve controller 2 as a vacuum valve control apparatus of this Embodiment, the above-mentioned detection space 23 and the switching space 27 are isolate | separated without communicating.

  That is, conventionally, the side of the detection space 23 that does not communicate with the water level detection tube 54 and the switching space 27 communicate with each other through a hole.

  On the other hand, in the present embodiment, the side (atmospheric pressure space 23b) of the detection space 23 that does not communicate with the water level detection tube 54 is communicated with the outside through the external connection port 215, while the switching space 27 has the pores. 216, an atmospheric pressure path 294, an atmospheric pressure connection port 213, etc., communicate with the ground.

  Next, the operation mechanism of the vacuum valve controller 2 as the vacuum valve control device of the present embodiment will be described with reference to FIGS.

  First, the case of opening the valve will be described with reference to FIG. 3. When the amount of sewage in the storage tank 52 gradually increases, the pressure in the water level detection pipe 54 in which the lower end is inserted into the sewage gradually increases. Then, the pressure in the pressurizing space 23a (see FIG. 5) of the detection space 23 connected to the inside of the water level detection tube 54 via the silicon tube 61 also increases.

  At this time, there is no vibration damping diaphragm (not shown) as before, and the inside of the water level detection tube 54 and the pressurized space 23a are directly connected.

  Subsequently, as shown in FIG. 5, the pressure in the pressurizing space 23 a gradually increases, so that the detection diaphragm 22 receives the pressure and moves while being deformed toward the bottom surface side. Also slides toward the bottom side.

  When the plunger 24 slides in this way, the leaf spring-like detection valve 25 arranged so as to contact the tip of the plunger 24 is pressed and jumped up, and the connection port of the branch path 292 connected to the vacuum pressure path 291 is opened. .

  Then, the vacuum pressure is introduced into the buffer spaces 27 a and 27 b of the switching space 27 through the vacuum pressure path 291 and the branch path 292 communicated with the vacuum exhaust pipe 51 through the silicon tube 62.

  At this time, air is sucked into the buffer space 27a through the pores 216. Since the diameter of the pores 216 is adjusted as described above, the buffer spaces 27a and 27b can be in a vacuum state.

  When the buffer spaces 27a and 27b are in a vacuum state, the switching diaphragm 26 moves while being deformed toward the top surface so that the switching diaphragm 26 is sucked up against the elastic reaction force of the spring. 28 also slides toward the top surface.

  Therefore, the three-way valve attached to the bottom end of the switching valve 28 abuts on the top side atmospheric pressure sealing packing 295 to seal the atmospheric pressure into the selective sealing space 293 while keeping the vacuum pressure. Is introduced.

  By moving the switching valve 28 in this way, the vacuum pressure is introduced into the spring-side space 18 of the vacuum valve 1 through the vacuum pressure path 291, the selective sealing space 293, and the vacuum valve connection port 214, and a vacuum state is established.

  Then, the rolling diaphragm 17 is elastically deformed, and the rod 14 and the valve body 13 are attracted toward the spring 16 against the urging force of the spring 16 to open the valve hole 12 formed in the flow path portion 11 (open). In the valve state), the vacuum pressure is introduced into the suction pipe 53 to suck the sewage (see FIG. 4).

  Next, the case where the valve is closed will be described. As shown in FIG. 3, when the amount of sewage in the storage tank 52 decreases, the pressure in the water level detection pipe 54 gradually decreases, and the pressurization space 23 a of the detection space 23. The pressure (see FIG. 5) also decreases.

  Subsequently, as shown in FIG. 5, the pressure in the pressurizing space 23a gradually decreases, so that the detection diaphragm 22 receives the elastic reaction force of the spring and moves while being deformed toward the top surface side, and the plunger 24 Also slides toward the top side.

  When the plunger 24 slides in this manner, the detection valve 25 returns to its original position, and the connection port of the branch path 292 connected to the vacuum pressure path 291 is sealed.

  Then, atmospheric pressure is gradually introduced into the buffer spaces 27a and 27b of the switching space 27 through the pores 216, and the switching diaphragm 26 is pushed back by the elastic reaction force of the spring and moves while being deformed toward the bottom surface side. Along with the movement, the switching valve 28 slides toward the bottom side.

  Therefore, the three-way valve attached to the bottom end of the switching valve 28 abuts on the bottom side vacuum pressure sealing packing 296 and introduces atmospheric pressure while sealing the vacuum pressure into the selective sealing space 293. To do.

  As the switching valve 28 is moved in this way, atmospheric pressure is introduced into the spring-side space 18 of the vacuum valve 1 through the atmospheric pressure path 294, the selective sealing space 293, and the vacuum valve connection port 214, and the atmospheric pressure state is obtained. .

  At this time, the air in the buffer spaces 27a and 27b of the switching space 27 is sucked through the pores 216. However, since the switching space 27 and the detection space 23 are separated, the air in the detection space 23 is sucked. There is no.

  Then, the rod 14 and the valve body 13 are pressed against the flow channel portion 11 side by the urging force of the spring 16 to seal the valve hole 12 formed in the flow channel portion 11 (closed state), and the vacuum pressure is sucked into the suction pipe. 53 will not be introduced.

  Next, the operation of the vacuum valve controller 2 as the vacuum valve control device of the present embodiment will be described.

  As described above, the vacuum valve controller 2 as the vacuum valve control device of the present embodiment includes the detection space 23, the detection valve 25, the switching space 27, and the switching valve 28, and the detection space 23 and the switching space 27 communicate with each other. Not separated.

  Therefore, when the vacuum valve 1 is closed, air on the side of the detection space 23 that is not communicated with the water level detection pipe 54 is sucked into the switching space 27, and the detection diaphragm 22 is elastically deformed to open the detection valve 25. The phenomenon that the vacuum valve 1 is repeatedly opened (so-called chattering) can be prevented.

  That is, when the switching valve 28 comes into contact with the vacuum pressure sealing packing 296 in order to close the valve, the vacuum valve connection port 214 and the selective seal are placed in the spring-side space 18 of the vacuum valve 1 which is in a vacuum state with the air removed. Air is sucked through the stop space 293 and the atmospheric pressure path 294.

  At this time, if the side of the detection space 23 that does not communicate with the water level detection pipe 54 communicates with the atmospheric pressure path 294, air is sucked in through the atmospheric pressure path 294, and the detection diaphragm 22 is deformed / moved again. The valve 25 is opened, the vacuum pressure is introduced into the switching space 27, the switching valve 28 is moved, and the atmospheric pressure sealing packing 295 is opened again.

  Therefore, if the detection space 23 and the switching space 27 are separated by not connecting the detection space 23 and the atmospheric pressure path 294, the suction operation through the atmospheric pressure path 294 can be prevented and the series of operations can be cut off. The phenomenon can be prevented.

  In addition, the atmospheric pressure space 23b on the side of the detection space 23 that is not in communication with the water level detection pipe 54 is in communication with the outside of the vacuum valve controller 2, and the buffer spaces 27a and 27b on the side of the switching space 27 on which the vacuum pressure is introduced are large. By communicating with the control breather pipe 65 that introduces atmospheric pressure through the pores 216, chattering can be prevented, and even if the outside is filled with liquid such as sewage, atmospheric pressure is introduced into the vacuum valve 1 to normal Can be operated.

  That is, unlike the conventional case, if the atmospheric pressure space 23b on the side not connected to the water level detection pipe 54 of the detection space 23 is not connected to the switching space 27 and is connected to the outside, the vacuum valve controller 2 is submerged by the sewage. In this case, the air enters the atmospheric pressure space 23b.

  However, since the atmospheric pressure space 23 b does not communicate with the switching space 27, atmospheric pressure can be introduced into the switching space 27 through the atmospheric pressure connection port 213 and the atmospheric pressure path 294.

  Furthermore, the diameter of the fine hole 216 is smaller than the diameter of the branch passage 292 that introduces the vacuum pressure from the vacuum exhaust pipe 51 to the switching space 27, so that the atmospheric pressure can be introduced with the detection valve 25 closed. In addition, the vacuum pressure can be efficiently introduced with the detection valve 25 opened.

  Then, the diameter of the pore 216 is formed to be equal to or smaller than the diameter at which the switching diaphragm 26 is elastically deformed and the vacuum pressure can be introduced into the vacuum valve 1 when the critical vacuum pressure at which the vacuum valve 1 operates is applied. The vacuum valve control device 2 is adapted to the capacity of the vacuum valve 1.

  That is, in order to operate the switching valve 28, it is necessary to introduce atmospheric pressure or vacuum pressure into the buffer spaces 27a and 27b of the switching space 27. In order to introduce atmospheric pressure, the diameter of the pores 216 is required. The diameter of the pores 216 is preferably small in order to introduce a vacuum pressure through the branch 292.

  Therefore, the diameter of the fine hole 216 is determined to be the maximum diameter satisfying both in consideration of the diameter of the branch path 292 and the limit vacuum pressure as described above, thereby efficiently introducing the vacuum pressure. Atmospheric pressure can be introduced.

  Further, if the diameter of the pore 216 is reduced to some extent in this way, when air is taken into the vacuum valve 1 through the atmospheric pressure path 294 as described above, the air resistance through the pore 216 is increased, Intake of air in the buffer spaces 27a and 27b can be suppressed.

  Moreover, even if the air in the buffer spaces 27a and 27b is taken in, the spring used for the switching diaphragm 26 has a larger elastic reaction force than the spring used for the detection diaphragm 22, so that the switching diaphragm is used. 26 has a structure that is difficult to deform and move.

  In other words, the vacuum valve controller 2 as the vacuum valve control device of the present embodiment senses a minute liquid level fluctuation in the water level detection tube 54 by the detection diaphragm 22 that moves against a weak spring, The switching between the atmospheric pressure and the vacuum pressure can be performed delicately and reliably by moving the switching diaphragm 26 and the switching valve 28 that move against a strong spring.

  Further, the control breather pipe 65 is provided with a speed adjusting valve 3 for adjusting the introduction speed of the atmospheric pressure introduced into the vacuum valve 1 through the switching valve 28, so that the liquid is mixed when the vacuum valve 1 is closed. The amount of air can be adjusted.

  That is, in the vacuum sewer system S of the present embodiment, in order to prevent the vacuum sewage pipeline from being blocked by sewage and transport it as a gas-liquid mixed flow, instead of sucking only sewage, It is necessary to mix a certain amount of air.

  For this reason, even if the liquid level falls and the pressure in the water level detection pipe 54 falls to atmospheric pressure, it is necessary to suck air through the suction pipe 53 for a certain period of time.

  Therefore, the speed control valve 3 is installed to limit the amount of air introduced into the spring-side space 18 of the vacuum valve 1 so that the vacuum valve 1 does not close even when the liquid level is lowered. It is possible to take time to close the vacuum valve 1 while maintaining the timing of switching to take in air. The speed adjustment valve 3 may be provided between the atmospheric pressure connection port 213 of the vacuum valve controller 2 and the control breather pipe 65.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment, the switching space 27 has the buffer spaces 27a and 27b divided into two. However, the present invention is not limited to this, and the buffer spaces 27a and 27b and the atmospheric pressure space 27c are not limited thereto. Are partitioned, the buffer space may be a single space that is not partitioned.

  In the above embodiment, the case where the speed adjustment valve 3 is installed in the control breather pipe 65 has been described. However, the present invention is not limited to this, and the speed adjustment can be performed if a certain amount of air can be mixed. The structure which does not provide the valve 3 may be sufficient.

  Furthermore, although the said embodiment demonstrated the case where the vacuum valve controller 2 as a vacuum valve control apparatus was attached to the upper part of the vacuum valve 1, it is not limited to this, A vacuum valve is provided in the vacuum valve unit U. 1 may be installed separately.

It is sectional drawing at the time of introduce | transducing atmospheric pressure explaining the structure of the vacuum valve control apparatus of the best embodiment of this invention. It is explanatory drawing explaining the whole structure of a vacuum type sewer system. It is explanatory drawing explaining the structure of a vacuum valve unit. It is explanatory drawing explaining the connection relation of a vacuum valve and a vacuum valve control apparatus. It is sectional drawing at the time of introducing the vacuum pressure explaining the structure of the vacuum valve control apparatus of the best embodiment of this invention.

Explanation of symbols

S Vacuum sewer system U Vacuum valve unit 1 Vacuum valve 2 Vacuum valve controller (vacuum valve controller)
22 Detection diaphragm 23 Detection space 24 Plunger 25 Detection valve 26 Switching diaphragm 27 Switching space 28 Switching valve 291 Vacuum pressure path 292 Branch path 293 Selective sealing space 294 Atmospheric pressure path 295 Atmospheric pressure sealing packing 296 Vacuum pressure sealing packing 3 Speed Adjustment valve 51 Vacuum exhaust pipe 52 Storage tank 53 Suction pipe 54 Water level detection pipe 55 Ventilation pipe 65 Control breather pipe

Claims (5)

Vacuum valve control connected to a vacuum valve provided between a vacuum exhaust pipe in a vacuum state and a suction pipe that sucks liquid in the storage tank by vacuum pressure, and opens and closes the vacuum valve by liquid level fluctuation of the liquid A device,
A detection space in which a detection diaphragm that is elastically deformed by pressure fluctuation in the water level detection pipe that detects the liquid level fluctuation is arranged, a detection valve that is opened and closed by movement of a plunger accompanying elastic deformation of the detection diaphragm, and the detection valve A switching space in which a switching diaphragm that is elastically deformed by a vacuum pressure that is opened and closed is arranged, and a switching that selectively introduces vacuum pressure or atmospheric pressure to the vacuum valve by being moved along with the elastic deformation of the switching diaphragm A valve, and
The vacuum valve control device, wherein the detection space and the switching space are separated without being communicated.   The side of the detection space that is not in communication with the water level detection pipe is in communication with the outside, and the side of the switching space in which the vacuum pressure is introduced is in communication with a control breather pipe that introduces atmospheric pressure through a pore. The vacuum valve control device according to claim 1.   3. The vacuum valve control device according to claim 2, wherein a diameter of the pore is smaller than a diameter of a branch path through which a vacuum pressure is introduced from the vacuum exhaust pipe into the switching space.   The pore diameter is formed to be equal to or smaller than a diameter at which the switching diaphragm can be elastically deformed to introduce the vacuum pressure into the vacuum valve when a critical vacuum pressure at which the vacuum valve operates is applied. The vacuum valve control device according to claim 2 or 3.   The vacuum according to any one of claims 2 to 4, wherein the control breather pipe is provided with a speed adjustment valve that adjusts an introduction speed of atmospheric pressure introduced through the switching valve. Valve control device.

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