JP4104254B2 - Simple vacuum valve unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a simple vacuum valve unit.
[0002]
[Prior art]
A vacuum sewage system has been developed that collects sewage discharged from each home by conveying it using vacuum pressure. In the vacuum sewage system, a vacuum sewage pipe is provided between a vacuum valve unit having a sewage tank in which sewage discharged from each household is stored and a water collection tank in which sewage is collected. The water collection tank is provided in a vacuum station provided with a vacuum pump for evacuating the inside of the vacuum sewage pipe, and the inside of the vacuum sewage pipe is evacuated by the vacuum pump of the vacuum station.
[0003]
The vacuum valve unit is provided with a sewage suction pipe for sucking the sewage stored in the sewage tank open to the atmospheric pressure, and a vacuum valve for communicating and blocking the sewage suction pipe and the vacuum sewage pipe. ing. The vacuum valve is controlled to open and close by a controller that uses the vacuum in the vacuum sewage pipe. When the vacuum valve is opened, the vacuum sewage pipe and the sewage suction pipe are in communication with each other, and the inside of the sewage tank Of sewage is sucked into the vacuum sewer pipe in a vacuum state.
[0004]
Air is sucked into the vacuum sewage pipe after the sewage is sucked or together with the sewage, and the sucked air flows in the vacuum sewage pipe at a higher speed than the flow rate of the sewage. Thus, when air flows at high speed in the vacuum sewage pipe with respect to the sewage, a gas-liquid two-phase flow of sewage and air is formed in the vacuum sewage pipe, and the gas-liquid two-phase flow is The sewage is transported at high speed in the pipe.
[0005]
[Problems to be solved by the invention]
However, the prior art has the following problems.
(1) The vacuum valve is equipped with a controller that is a precision instrument, and is complicated and expensive.
[0006]
(2) Since the vacuum valve is equipped with a controller, the vacuum valve is connected to the connecting part between the vacuum sewage pipe and the sewage suction pipe so as to cross diagonally from above, and this connecting part becomes like a Y-type pipe line. The dimensions are larger.
[0007]
An object of the present invention is to eliminate a controller of a vacuum valve in a vacuum valve unit, and to achieve low cost and compactness.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a vacuum valve at a connecting portion between a sewage suction pipe communicating with a sewage reservoir provided in a sewage tank and a vacuum sewage pipe communicating with a vacuum source. In a simple vacuum valve unit that enables suction of accumulated sewage from the sewage suction pipe to the vacuum sewage pipe, the sewage inlet that communicates with the sewage suction pipe, the sewage outlet that communicates with the vacuum sewage pipe, and their inlets And a valve body having a valve seat between the outlet and the valve seat, and a valve body that can be brought into contact with and separated from the valve seat of the valve box. And a spring for urging the valve body toward the closing side in contact with the valve seat, the vacuum pressure of the vacuum sewage pipe acting on the valve body of the vacuum valve, and the closing direction force resulting from the urging force of the spring Due to the sewage storage gravity of the sewage reservoir connected to the valve body of the vacuum valve The change in the balance between the gas directed force is obtained by the so the vacuum valve as that open.
[0009]
The building according to claim 2 is the building according to claim 1, wherein the spring is further interposed between a sewage tank and a sewage reservoir.
[0010]
The building according to claim 3 is the building according to claim 1, wherein the spring is housed in a spring chamber provided in a valve box of a vacuum valve.
[0011]
The building according to claim 4 is the intake valve according to the present invention according to any one of claims 1 to 3, wherein the intake valve is further closed by a vacuum in the vacuum sewage pipe in a portion close to the vacuum valve of the vacuum sewage pipe. Are connected, and when the degree of vacuum in the vacuum sewage pipe decreases, the intake valve is opened so that air can be supplied into the vacuum sewage pipe.
[0012]
The building according to claim 5 is further provided with a separation mass capable of separating solid waste and the like in the sewage inflow pipe for allowing sewage to flow into the sewage reservoir in the present invention according to any one of claims 1 to 4. It was made to become.
[0013]
[Action]
According to the first aspect of the invention, the following effects (1) and (2) are obtained.
{Circle around (1)} Since the sewage reservoir and the valve body of the vacuum valve are connected by a connecting means and a spring for biasing the valve body toward the closing side in contact with the valve seat is provided, the controller can be eliminated and the cost can be reduced.
[0014]
(2) When a vacuum valve is installed at the connecting part between the vacuum sewage pipe and the sewage suction pipe, the sewage suction pipe is connected directly below the vacuum valve, and this sewage suction pipe is arranged in the connecting means between the valve body and the sewage reservoir. By arranging it, this connecting part is made like an L-shaped pipe, and the planar dimensions can be made compact.
[0015]
According to the invention of claim 2, there is the following effect (3).
(3) A sewage reservoir can be stably supported by interposing a spring between the sewage tank and the sewage reservoir.
[0016]
The invention according to claim 3 has the following effect (4).
(4) By storing the spring in the spring chamber provided in the valve box of the vacuum valve, the spring can be built in the valve box of the vacuum valve in advance, and the parts can be easily assembled into the vacuum valve unit.
[0017]
The invention according to claim 4 has the following effect (5).
(5) When the vacuum valve is opened and sewage and air are sequentially sucked into the vacuum sewage pipe, the vacuum valve is closed. Even after the vacuum valve is closed, the degree of vacuum in the vacuum sewage pipe The air intake valve is opened accordingly, and the required air is drawn into the vacuum sewage pipe. Therefore, in the vacuum sewage pipe, the gas-liquid close to the gas-liquid two-phase flow in the gas-liquid simultaneous suction system It can be a two-phase flow. As a result, unlike the control method of supplying preset air into the vacuum sewage pipe, it is possible to supply an appropriate amount of air corresponding to the degree of vacuum that frequently changes in the vacuum sewage pipe.
[0018]
The invention according to claim 5 has the following effect (6).
(6) By providing a separation mass in the sewage inflow pipe connected to the sewage reservoir, solid filth and the like can be separated.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 is a layout view showing a vacuum sewage system, FIG. 2 is a cross-sectional view showing an embedded state of a vacuum sewage pipe, FIG. 3 is a cross-sectional view showing a vacuum valve unit of the first embodiment, and FIG. 4 is a closed state of an intake valve. FIG. 5 is a sectional view showing the open state of the intake valve, FIG. 6 is a sectional view showing the vacuum valve unit of the second embodiment, and FIG. 7 is a sectional view showing the vacuum valve unit of the third embodiment. is there.
[0020]
First Embodiment (FIGS. 1 to 5)
1 and 2 are schematic configuration diagrams showing an example of an embodiment of a vacuum sewage system according to the present invention. In this vacuum sewage system, sewage discharged from homes, factories and the like naturally flows down in the sewage inflow pipe 12 and is stored in the vacuum valve unit 10 buried in the ground, and is stored in the vacuum valve unit 10. The stored sewage passes through the vacuum sewage pipe 31 and is collected in a water collection tank 32A provided in the vacuum station 32, and then sent to a sewage treatment plant or the like by a pressure feed pump 32B. The vacuum sewage pipe 31 that connects the vacuum valve unit 10 and the water collection tank provided in the vacuum station 32 is evacuated by a vacuum pump 32 </ b> C provided in the vacuum station 32.
[0021]
The vacuum sewage pipe 31 has a descending slope portion 31a that has a gentle downward slope in a relatively shallow underground portion close to the ground surface, and a height difference of about 30 cm continuously from the downstream side of the downward slope portion 31a. In the case where the upslope part (lift part) 31b that has become the upslope is buried so as to be repeated in sequence, and the vacuum sewage pipe 31 has obstacles 33 such as rivers and existing water pipes. A detour portion 31c is provided so as to pass below the obstacle 33. The detour portion 31 c may pass above the obstacle 33.
[0022]
FIG. 3 is a schematic configuration diagram illustrating an example of the vacuum valve unit 10 provided in the vacuum sewage system. The vacuum valve unit 10 includes a resin or concrete sewage tank 11 embedded in the ground, and the sewage tank 11 includes a sewage reservoir 11a that is a separate body. The sewage reservoir 11a is stored from the inflow pipe 12. In the sewage tank 11, the upstream end of the vacuum sewage pipe 31 is inserted substantially horizontally, and the sewage suction pipe 13 is set up substantially vertically so as to communicate with the sewage reservoir 11a, and the vacuum sewage pipe A vacuum valve 14 is provided at a communication portion with 31. The vacuum valve 14 opens as described later when a certain amount or more of sewage is stored in the sewage reservoir 11a, and sucks the sewage in the sewage reservoir 11a from the sewage suction pipe 13 to the vacuum sewage pipe 31.
[0023]
The vacuum valve 14 includes a sewage inlet 15A that communicates with the sewage suction pipe 13, a sewage outlet 15B that communicates with the vacuum sewage pipe 31, and a valve seat 15C between the inlet 15A and the outlet 15B. It has the box 15 and the valve body 16 which can be contacted / separated with the valve seat 15C of the valve box 15. An O-ring 15 </ b> D is attached to the valve body penetrating portion of the valve box 15.
[0024]
The vacuum valve 14 is connected to the valve body 16 with a connecting rod 16a, suspended so that the connecting rod 16a is juxtaposed with the sewage suction pipe 13, and the bottom of the sewage reservoir 11a is fixed to the bottom with a nut. ing. And between the bottom part of the sewage tank 11 and the bottom part of the sewage reservoir 11a, a spring 17 for biasing the valve body 16 toward the closing side in contact with the valve seat 15C is interposed.
[0025]
As a result, the vacuum valve 14 has a closing direction force resulting from the vacuum pressure of the vacuum sewage pipe 31 acting on the valve body 16 and the biasing force of the spring 17, and sewage storage of the sewage reservoir 11 a connected to the valve body 16. Due to the change in the balance with the force in the opening direction caused by gravity, the valve body 16 is opened and closed so as to contact and separate from the valve seat 15C.
[0026]
Therefore, in the vacuum valve 14, the sewage reservoir 11 a is lifted by the urging force of the spring 17 to close the valve body 16 in the steady state where the sewage reservoir 11 a is still light, and the sewage reservoir 11 a of the sewage suction pipe 13 is closed. The gap is made smaller. When the sewage storage weight of the sewage reservoir 11a becomes heavy and the valve body 16 is opened, the clearance between the sewage suction pipe 13 and the sewage reservoir 11a becomes large, and suction of sewage starts. When the sewage reservoir weight of the sewage reservoir 11a is reduced by suction of sewage, the sewage reservoir 11a is raised again by the urging force of the spring 17 and closes the valve body 16.
[0027]
In addition, the flow path in the valve box 15 is given a smooth downward gradient so as to easily discharge the sewage that cannot be sucked into the vacuum sewage pipe 31 side.
[0028]
An air inflow pipe 100 is connected to the upper part of the sewage reservoir 11 a provided at the lower part of the sewage tank 11. The air inflow pipe 100 is piped in the ground, and a tip portion thereof protrudes upward from the ground surface and is disposed in the atmosphere. The air inflow pipe 100 is configured so that when the sewage and air stored in the sewage reservoir 11 a of the sewage tank 11 are vacuumed into the sewage suction pipe 13, ground air is introduced into the sewage reservoir 11 a of the sewage tank 11. It is made to flow in and the fall of the pressure in the sewage reservoir 11a is prevented.
[0029]
In the air inflow pipe 100, an air introduction pipe 18 that directly supplies the air in the air inflow pipe 100 into the vacuum sewage pipe 31 through the intake valve 20 is provided. Thus, by providing the air introduction pipe 18 in the air inflow pipe 100, even when the sewage tank 11 of the vacuum valve unit 10 is submerged, air is surely introduced into the vacuum sewage pipe 31. Can be supplied. However, when it is not necessary to consider the submerged state in the sewage tank 11 of the vacuum valve unit 10, the intake valve 20 is opened in the sewage tank 11, and the air in the sewage tank 11 is directly vacuumed. You may make it supply to the water pipe 31. FIG.
[0030]
FIG. 4 is a cross-sectional view of the intake valve 20. The intake valve 20 is attached to the valve box 21 connected to the upstream part 18 a and the downstream part 18 b of the air introduction pipe 18, the valve body 22 provided in the valve box 21, and the valve box 21. And a cap body 23. The downstream portion 18 b of the air introduction pipe 18 is connected to the vacuum sewage pipe 31.
[0031]
The valve box 21 is configured in a cylindrical body provided with a valve body housing portion 21 d that protrudes in a cylindrical shape laterally in the center in the axial direction, and one end thereof is connected to the upstream side portion 18 a of the air introduction pipe 18. It is the inflow part 21a connected. The other end concentric with the inflow portion 21 a is a cylindrical outflow portion 21 b connected to the downstream portion 18 b of the air introduction pipe 18. 21 d of valve body accommodating parts are in the orthogonal state with the inflow part 21a and the outflow part 21b, respectively, and are connected to the outflow part 21b. The inflow portion 21a of the valve box 21 is in a state of being isolated from the outflow portion 21b and the valve body housing portion 21d by the partition wall portion 21c, and the intake air that connects the valve body housing portion 21d and the inflow portion 21a to the partition wall portion 21c. The mouth 21e is provided concentrically with the shaft center of the valve body housing portion 21d.
[0032]
A hollow frustoconical cap 23 is integrated with the valve body accommodating portion 21d together with the diaphragm 24 by a bolt 23b via a diaphragm 24 that covers the distal end opening in an airtight state at the distal end portion of the valve body accommodating portion 21d. Installed. In the cylindrical valve body housing portion 21d, the columnar valve body 22 is concentric with the intake port 21e provided in the partition wall portion 21c, and is in a direction in which it is in contact with and away from the intake hole 21e. Is slidable. The diaphragm 24 is made of a thermoplastic elastomer or the like.
[0033]
The outer diameter of the cap body 23 attached to the valve housing portion 23d is gradually reduced as the cap body 23 moves away from the valve body housing portion 21d, and the nut member 23a is attached to the shaft center portion at the tip portion. . An adjusting bolt 23c that passes through the axial center of the cap body 23 is screwed to the nut member 23a, and the head of the adjusting bolt 23c is disposed so as to be close to the valve body housing portion 21d. The tip of the adjustment bolt 23c opposite to the head protrudes upward from the tip of the cap body 23, and the portion protruding from the cap body 23 is detachable from the cap body 23. 26.
[0034]
The adjustment bolt 23c is screw-fed to the nut member 23a attached to the front end portion of the cap body 23 by operating the front end portion protruding from the cap body 23 and rotating forward and backward, and along the axial direction. Slides up and down.
[0035]
A compression spring 23e is fitted to the shaft portion of the adjustment bolt 23c disposed in the cap body 23. The compression spring 23e is adjusted in a compressed state by a lower spring receiver 23f attached adjacent to the head of the adjustment bolt 23c and an upper spring receiver 23h provided slidably in the middle of the adjustment bolt 23c. 23c is fitted. The upper spring receiver 23h is retained by a C-shaped retaining ring 23g.
[0036]
The compression spring 23e is accommodated in a cylindrical piston member 23d fitted concentrically with the adjustment bolt 23c. An end surface of the piston member 23d adjacent to the nut member 23a is engaged with a spring receiver 23f that supports the upper end portion of the compression spring 23e via a C-type retaining ring 23g. 23e is supported so as to be slidable along the adjusting bolt 23c while being urged upwardly away from the valve body housing portion 21d.
[0037]
The upper end portion of the valve rod 22a is supported on the axial center portion of the lower end surface of the piston member 23d adjacent to the valve body housing portion 21d. The valve stem 22a passes through the lower end surface of the piston member 23d and the shaft center portion of the diaphragm 24 and is inserted into the valve body housing portion 21d, and is inserted through the shaft center portion of the valve body housing portion 21d. It penetrates the axial center part of the valve body 22 provided in the body accommodating part 21d. The lower end portion of the valve stem 23d is inserted concentrically into an intake port 21e that communicates the valve body housing portion 21d and the inflow portion 21a. A guide body 25 is attached to the lower end portion of the valve rod 22a inserted into the intake port 21e via a packing 22b.
[0038]
The guide body 25 is inserted through the intake port 21e provided in the partition wall portion 21c of the valve box 21 and enters the inflow portion 21a of the valve box 21. The guide body 25 is formed in a columnar shape that is concentric with the valve rod 22a and the intake port 21e except for the upper end portion close to the valve body 22, and is provided with a certain distance from the intake port 21e. ing. The upper end portion of the guide body 25 is a frustoconical guide portion 25a having an outer diameter that gradually increases toward the upper side.
[0039]
The packing 22b provided between the valve body 22 and the guide body 25 is formed in a disk shape having an outer diameter slightly larger than the outer diameter of the air inlet 21e through which the guide body 25 is inserted by an elastic body such as rubber. The valve body 22 is inserted into a recess formed at the center of the lower end surface of the valve body 22 and is pressed against the lower end surface of the valve body 22. The packing 22b is press-contacted in an airtight state over the entire circumference of the valve seat portion 21f around the intake port 21e.
[0040]
The guide body 25a is in a state where a packing 22b provided between the guide body 25a and the valve body 22 is sandwiched between the guide body 25a and the upper end surface of the valve body 22 via the diaphragm 24 to the lower end surface of the piston member 23d. It is integrally attached to the lower end portion of the valve rod 22a so as to be pressed. Accordingly, the piston member 23d provided in the cap body 23, the valve body 22 provided in the valve body housing portion 21d, and the diaphragm 24 provided between the piston member 23d and the valve body 22 are integrated. In addition, the valve body 22 and the guide body 25 are also integrated with the packing 22b.
[0041]
The guide body 25 is slid downward together with the valve body 22 when the piston member 23d slides downward against the spring force of the compression spring 23e, and is provided between the guide body 25 and the valve body 22. The packing 22b is brought into pressure contact with the valve seat 21f around the intake port 21e to close the intake port 21e in an airtight manner. On the contrary, when the guide body 25 slides upward, the pressure contact state between the packing 22b and the valve seat 21f is released, and the valve box 21 passes through the gap between the inner peripheral surface of the intake port 21e and the outer peripheral surface of the guide body 25. The inflow portion 21a and the inside of the valve body accommodating portion 21d are in communication with each other. In such a state, the air inflow pipe 100 into which the ground surface air flows and the vacuum sewage pipe 31 are in communication with each other, and the ground surface air passes through the air inflow pipe 18 and the intake valve 20 to be in the vacuum sewage pipe. 31.
[0042]
In the vacuum sewage system having such a configuration, when the vacuum valve unit 10 is in an operating state, the inside of the vacuum sewage pipe 31 is evacuated by a vacuum pump provided in a vacuum station.
[0043]
When the inside of the vacuum sewage pipe 31 is in a vacuum state, the intake valve 20 provided in the vacuum valve unit 10 is in a vacuum state in which the inside of the valve body housing portion 21d is the same as the inside of the vacuum sewage pipe 31. A suction force P directed toward the inside of the valve body housing portion 21d acts on the diaphragm 24 that isolates the portion 21d and the cap body 23 in an airtight state. When the suction force P becomes larger than the spring force F of the compression spring 23e set by the adjustment bolt 23c, the diaphragm 24 is sucked into the valve body housing portion 21d, and the piston member 23d, the valve body 22, the guide The body 25 integrally slides downward, and the packing 22b is pressed against the valve seat 21f in an airtight state. Thereby, the inlet 21e which connects the inflow part 21a of the valve box 21 and the valve body accommodating part 21d is closed in an airtight state.
[0044]
Thereafter, the force in the opening direction of the vacuum valve 14 caused by the stored gravity of the sewage stored in the sewage reservoir 11 a of the sewage tank 11 in the vacuum valve unit 10 acts on the valve body 16 of the vacuum valve 14 in the vacuum sewage pipe 31. If the closing pressure resulting from the vacuum pressure and the biasing force of the spring 17 is exceeded, the vacuum valve 14 is opened. As a result, the sewage suction pipe 13 and the vacuum sewage pipe 31 communicate with each other, the inside of the sewage suction pipe 13 becomes a vacuum state similar to the inside of the vacuum sewage pipe 31, and is stored in the sewage reservoir 11 a of the sewage tank 11. Sewage is sucked into the vacuum sewage pipe 31 through the sewage suction pipe 13. When the sewage in the sewage reservoir 11a is sucked into the vacuum sewage pipe 31, the sewage water level in the sewage spillage 11a is lowered and the sewage storage weight is reduced, the sewage suction pipe 13 is moved into the sewage reservoir 11a. After that, the vacuum valve 14 is closed.
[0045]
When sewage and air are sucked into the vacuum sewage pipe 31, the sewage flows in the vacuum sewage pipe 31 as a gas-liquid two-phase flow together with air. However, since air flows at a higher speed than sewage, in the upward inclined portion 31b of the vacuum sewage pipe 31, only air passes and the sewage stays in the lowest portion of the upward inclined portion 31b.
[0046]
Thus, sewage accumulates in the upward inclined portion 31b of the vacuum sewage pipe 31, and a faucet that seals only the lower portion of the upward inclined portion 31b is formed. When a water block is formed in which the entire upward inclined portion 31b is completely sealed, the vacuum pressure in the vacuum sewage pipe 31 downstream from the portion where the water block is formed is transmitted to the upstream side of the water block. The pressure in the upstream portion of the water block increases. Thereby, the pressure in the vacuum sewage pipe 31 on the upstream side of the portion where the water block is formed is increased, and the degree of vacuum in the interior is decreased.
[0047]
If it will be in such a state, the vacuum degree of the downstream part 18b of the air introduction pipe 18 connected to the vacuum sewage pipe 31 in the vacuum valve unit 10 will fall, and the outflow part 21b of the intake valve 20 and the valve body accommodating part 21d The pressure inside rises. As shown in FIG. 5, when the suction force P acting on the diaphragm 24 becomes smaller than the spring force F of the compression spring 23e, the piston member 23d slides upward by the spring force F of the compression spring 23e, and the piston It slides above the valve body 22 and the guide body 25 integrated with the member 23d. Thereby, the packing 22b press-contacted to the valve seat 21f around the intake port 21e communicating the inflow portion 21a and the valve body accommodating portion 21d is also slid upward. As a result, the intake port 21e is opened, and the inflow portion 21a communicates with the outflow portion 21b via the valve body housing portion 21d.
[0048]
At this time, the outflow portion 21b is in a vacuum state lower than the atmospheric pressure, although the degree of vacuum is reduced, as in the inside of the vacuum sewage pipe 31, so that the intake port 21e is opened. The inflow air is sucked into the inflow portion 21a through the air inflow pipe 100 and the upstream portion 18a of the air introduction pipe 18. The air that has flowed into the inflow portion 21 a is supplied into the vacuum sewage pipe 31 through the valve body housing portion 21 d, the outflow portion 21 b, and the downstream portion 18 b of the air introduction pipe 21.
[0049]
When air is sucked into the vacuum sewage pipe 31, the water block that seals the inside of the vacuum sewage pipe 31 increases the pressure on the upstream side of the water block in the vacuum sewage pipe 31, thereby lowering the degree of vacuum. If the pressure in the vacuum sewage pipe 31 rises due to the opening of the intake port 21e being continued, the air supplied into the vacuum sewage pipe 31 passes through the water block. When air passes through the water block, the sewage forming the water block becomes a gas-liquid two-phase flow together with the air flowing at high speed, and flows in the vacuum sewage pipe 31. Thus, the sewage passes through the upward inclined portion 31 b in the vacuum sewage pipe 31.
[0050]
When the sewage accumulated in the vacuum sewage pipe 31 flows and the water block is eliminated, the degree of vacuum rises throughout the vacuum sewage pipe 31. When the suction force P acting on the diaphragm 24 of the intake valve 20 becomes larger than the spring force F of the compression spring 23e, the intake port 21e is closed.
[0051]
Thereafter, the same operation is repeated, whereby the sewage becomes a gas-liquid two-phase flow, is sequentially conveyed, and is supplied to a water collection tank provided in the vacuum station 32.
[0052]
As described above, in the vacuum sewage system of the present invention, when the vacuum valve 14 is opened and sewage and air are sequentially sucked into the vacuum sewage pipe 31, the vacuum valve 14 is closed. Since the intake valve 20 is opened according to the degree of vacuum in the vacuum sewage pipe 31 and the required air is sucked into the vacuum sewage pipe 31 even after the valve is closed. In the vacuum sewage pipe 31, a gas-liquid two-phase flow close to a gas-liquid two-phase flow in the gas-liquid simultaneous separation and suction method can be obtained. As a result, unlike the control method of supplying preset air into the vacuum sewage pipe, it is possible to supply an appropriate amount of air corresponding to the degree of vacuum that frequently changes in the vacuum sewage pipe 31.
[0053]
The degree of vacuum in the vacuum sewage pipe 31 when the intake valve 20 opens and closes the intake port 21e can be adjusted by rotating the adjustment bolt 23c and changing the spring force F of the compression spring 23e. That is, when the adjustment bolt 23c is rotated to move the entire adjustment bolt 23c away from the intake port 21e, the spring force F of the compression spring 23e increases, and the diaphragm 24 necessary for closing the intake port 21e is obtained. Suction force P, that is, the degree of vacuum in the vacuum sewage pipe 31 increases. On the other hand, when the entire adjustment bolt 23c is moved in the direction approaching the intake port 21e, the spring force F of the compression spring 23e decreases, and the suction force P of the diaphragm 24 necessary for closing the intake port 21e, that is, The degree of vacuum in the vacuum sewage pipe 31 is reduced.
[0054]
Normally, when the pressure in the vacuum sewage pipe 31 is set to -4.5 mAq, the pressure at which the intake port 21e in the intake valve 20 is opened is set to about -3.0 mAq.
[0055]
If the degree of vacuum for opening the intake port 21e is set small so that the difference from the degree of vacuum in the steady state in the vacuum sewage pipe 31 is large, the inside of the vacuum sewage pipe 31 is steady after the water block is eliminated. It may take time to return to the vacuum level, which is not preferable. However, the intake valve 20 of the vacuum valve unit 10 provided at the upstream end portion of the long vacuum sewage pipe 31 having a small upward inclined portion 31b is opened even at a low degree of vacuum so that the vacuum valve does not operate. In this case, air is sucked into the vacuum sewage pipe 31 for a relatively long time, whereby the sewage accumulated in the vacuum sewage pipe 31 flows gently.
[0056]
When the degree of vacuum at which the air inlet 21e is opened is set so as to reduce the difference from the degree of vacuum in the steady state vacuum sewage pipe 31, the degree of vacuum in the vacuum sewage pipe 31 slightly decreases, The intake valve 20 is opened. Therefore, as soon as the vacuum valve 14 of the vacuum valve unit 10 is opened and the suction of sewage from the sewage suction pipe 15 is started, when the degree of vacuum in the vacuum sewage pipe 31 is reduced, the intake port 21e of the intake valve 20 is immediately opened. It is opened and air is sucked into the vacuum sewage pipe 31. As a result, a gas-liquid two-phase flow in which the sewage flows together with the air sucked into the vacuum sewage pipe 31 can be formed at the beginning of the sewage suction start, and a suction mode similar to the gas-liquid simultaneous suction method can be obtained. it can.
[0057]
Therefore, according to the present embodiment, there are the following operations.
(1) The sewage reservoir 11a and the valve body 16 of the vacuum valve 14 are connected by a connecting rod 16a, and a spring 17 is provided for biasing the valve body 16 to the closed side in contact with the valve seat 15c. This can be done at low cost.
[0058]
(2) When the vacuum valve 14 is interposed in the connecting portion between the vacuum sewage pipe 31 and the sewage suction pipe 13, the sewage suction pipe 13 is connected directly below the vacuum valve 14, and the sewage suction pipe 13 is connected to the valve body 16 and the sewage. By arranging the connecting rod 16a and the reservoir 11a side by side, the connecting portion can be made like an L-shaped pipe, and the planar dimensions can be made compact.
[0059]
(3) By installing the spring 17 between the sewage tank 11 and the sewage reservoir 11a, the sewage reservoir 11a can be stably supported.
[0060]
Second Embodiment (FIG. 6)
The second embodiment is different from the first embodiment in that the intake valve 20 provided on the outflow side of the vacuum valve 14 is removed.
[0061]
Third Embodiment (FIG. 7)
The third embodiment is different from the first embodiment in that the spring 17 that biases the valve body 16 of the vacuum valve 14 in the closing direction is housed in a spring chamber 17A provided in the valve box 15 of the vacuum valve 14. .
[0062]
In the third embodiment, the sewage reservoir 11 a is suspended from the valve body 16 and floated in the sewage tank 11. When an opening direction force is applied by the sewage storage gravity of the sewage reservoir 11a, and the opening direction force becomes larger than the closing direction force caused by the vacuum pressure acting on the valve body 16 and the biasing force of the spring 17, the valve body 16 And start sucking sewage. When the sewage reservoir 11a is reduced in weight by the suction of sewage, the sewage reservoir 11a is raised by the biasing force of the spring 17, and the valve body 16 is closed.
[0063]
According to the third embodiment, by storing the spring 17 in the spring chamber 17 a provided in the valve box 15 of the vacuum valve 14, the spring 17 can be built in the valve box 15 of the vacuum valve 14 in advance. Can be improved.
[0064]
In the vacuum valve unit 10 of the first to third embodiments, the sewage inflow pipe 12 that allows sewage to flow into the sewage reservoir 11a may be provided with a separation mass that can separate solid filth and the like. .
[0065]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.
[0066]
【The invention's effect】
As described above, according to the present invention, in the vacuum valve unit, the controller of the vacuum valve can be eliminated, and low cost and compactness can be achieved.
[Brief description of the drawings]
FIG. 1 is a layout view showing a vacuum sewage system.
FIG. 2 is a cross-sectional view showing an embedded state of a vacuum sewage pipe.
FIG. 3 is a cross-sectional view showing the vacuum valve unit of the first embodiment.
FIG. 4 is a cross-sectional view showing a closed state of the intake valve.
FIG. 5 is a cross-sectional view showing an open state of the intake valve.
FIG. 6 is a cross-sectional view showing a vacuum valve unit according to a second embodiment.
FIG. 7 is a cross-sectional view showing a vacuum valve unit according to a third embodiment.
[Explanation of symbols]
10 Vacuum valve unit
11 Sewage tank
11a Wastewater pool
12 Wastewater inflow pipe
13 Sewage suction pipe
14 Vacuum valve
15 Valve box
15a Sewage inlet
15b Sewage outlet
15c Valve seat
16 Disc
16a Connecting rod (connecting means)
17 Spring
17a Spring chamber
20 Intake valve
31 Vacuum sewer pipe

Claims (5)

A vacuum valve is provided at the connection between the sewage suction pipe communicating with the sewage reservoir provided in the sewage tank and the vacuum sewage pipe communicating with the vacuum source. By opening the vacuum valve, sewage in the sewage reservoir is vacuumed from the sewage suction pipe. In the simple vacuum valve unit that can be sucked into the sewer pipe,
A vacuum valve having a sewage inflow port communicating with the sewage suction pipe, a sewage outflow port communicating with the vacuum sewage pipe, and a valve seat between the inflow port and the outflow port; and a valve seat of the valve box And a valve body that can be contacted and separated,
A sewage reservoir is connected to the valve body of the vacuum valve via a connecting means, and a spring for biasing the valve body toward the closing side in contact with the valve seat is provided,
The closing direction force due to the vacuum pressure of the vacuum sewer pipe acting on the valve body of the vacuum valve and the biasing force of the spring, and the opening direction force due to the sewage storage gravity of the sewage reservoir connected to the valve body of the vacuum valve A simple vacuum valve unit, wherein the vacuum valve can be opened and closed by a change in balance. The simple vacuum valve unit according to claim 1, wherein the spring is interposed between a sewage tank and a sewage reservoir. The simple vacuum valve unit according to claim 1, wherein the spring is housed in a spring chamber provided in a valve box of the vacuum valve. An intake valve is connected to a portion of the vacuum sewage pipe close to the vacuum valve so as to be closed by the vacuum in the vacuum sewage pipe, and when the vacuum degree in the vacuum sewage pipe is lowered, the intake valve is opened and vacuumed. The simple vacuum valve unit according to any one of claims 1 to 3, wherein air can be supplied into the sewer pipe. The simple vacuum valve unit according to any one of claims 1 to 4, further comprising a separation mass capable of separating solid waste and the like in a sewage inflow pipe that allows sewage to flow into the sewage reservoir.

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