JPH08319662A - Water block preventive structure of vacuum type sewarage - Google Patents

Abstract

PURPOSE: To prevent a water block generated in vacuum type sewarage automatically. CONSTITUTION: In the water block preventive structure of vacuum type sewarage, an air introducing valve 103 is installed to a vacuum sewer pipe 14. The air introducing valve 103 opens automatically and makes at possible to introduce into the vacuum sewer pipe 14 when the degree of vacuum of the vacuum sewer pipe 14 decreases below a fixed value, and closes and maintains a state when the degree of vacuum of the vacuum sewer pipe 14 exceeds the fixed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water block prevention structure for vacuum sewers.

[0002]

2. Description of the Related Art Vacuum sewerage allows sewage discharged from homes, factories, etc. to flow into a sewage masu through a natural sewage inflow pipe, and the sewage collected in the sewage masu collects through a vacuum sewer pipe. And then sent to a sewage treatment plant by a pressure pump.

At this time, the sewage tank is provided with a suction pipe which is connected to the vacuum sewer pipe through a vacuum valve. The vacuum valve uses the vacuum pressure applied to the vacuum sewer pipe by the vacuum source provided in the collected wastewater as a driving power source.
Then, when the water level of the sewage masu rises above a certain level, the vacuum valve provided in the connection between the suction pipe and the vacuum sewer pipe is opened, and the vacuum source provided in the collecting sewage masu is under vacuum. The vacuum pressure applied to the water pipe is applied to the suction pipe, and due to the pressure difference between the atmospheric pressure acting on the water surface of the sewage masu and the vacuum pressure applied to the vacuum sewer pipe, the sewage in the sewage masu is sucked in. , It is designed to send the collected wastewater through the vacuum sewer pipe. When sucking sewage with a vacuum valve, (a) the gas-liquid separation suction method sucks air into the vacuum sewer pipe after suctioning the sewage, and (b) the simultaneous gas-liquid suction method sucks sewage and air into the vacuum sewer pipe at a certain level. Suction at the same time while maintaining the liquid ratio. These air expands in the vacuum sewer pipe and creates a mixed flow with sewage, which becomes the driving force for sewage transportation.

In the prior art, as described in Japanese Utility Model Laid-Open No. 5-10588, by stabilizing the degree of vacuum in the vacuum sewer pipe, the frequent start and stop of the vacuum pump constituting the vacuum source is reduced. In order to extend its life, an automatically operated vacuum relief valve that operates to open and suction air when the vacuum degree of the vacuum sewer pipe rises to the upper limit value and to close when the vacuum degree falls to the lower limit value. It is proposed to have.

However, in the vacuum sewer system, in order to make the buried depth of the vacuum sewer pipe shallow, a serrated pipe line having a gentle slope and a lift in the middle is adopted as the pipe line of the vacuum sewer pipe. are doing. Also, in the vacuum sewer,
If there are obstacles such as rivers and underground pipes (water pipes, electric pipes, etc.) in the laying route, the pipe intermediate part of the vacuum sewer pipe has a concealment that passes through those obstacles. These lifts and concealments form a low water level portion between the upstream vacuum sewer pipe and the downstream vacuum sewer pipe.

For this reason, in the vacuum sewer system, sewage is constantly deposited on the low water level portion in the vacuum sewer pipe, and the deposit is completely blocked by the water block (the vacuum sewer pipe including the lift upstream line is completely sealed). Be produced). The water block shuts off the propagation of this vacuum pressure to the upstream side even if the vacuum source provided in the water collecting sewage applies a vacuum pressure to the vacuum sewer pipe, and as a result disables the vacuum valve, As a result, the vacuum valve does not open even if the water level of the wastewater rises above a certain level, and the wastewater overflows in the wastewater, making the vacuum sewer system unsuccessful.

[0007] Conventionally, therefore, as disclosed in Japanese Patent Laid-Open No. 4-258424, in a sewer of a vacuum sewer, two water pipes and a vent pipe that are parallel to each other are provided between an upstream side and a downstream side of the sewer. Even if a water block is generated in the water pipe, the vacuum pressure of the downstream side is transmitted to the upstream side by the ventilation pipe in order to establish the vacuum sewer system.

[0008]

However, in the conventional technique in which the water pipe and the ventilation pipe are installed in parallel in the concealment of the vacuum sewer, the contaminated water is always accumulated in the sewerage pipe,
If the amount of accumulated sewage increases, the ventilation pipe will also be blocked by the sewage. Therefore, in this conventional technique, an opening / closing valve a is provided in the ventilation pipe, an opening / closing valve b for opening to the atmosphere is provided in the upstream vacuum sewer pipe, and the opening / closing valve a is regularly closed.
It is necessary to perform a manual operation to open the on-off valve b to forcibly convey the contaminated accumulated wastewater. The opening / closing operations of the opening / closing valves a and b must be manually and reliably performed periodically, which is complicated.

The water block described above may also occur in a portion where the degree of vacuum is low around the end of the vacuum sewer pipe and the like.

An object of the present invention is to automatically eliminate a water block generated in a vacuum sewer.

[0011]

SUMMARY OF THE INVENTION The present invention according to claim 1 is an air inlet of a branch pipe connected to a vacuum sewer pipe in a water block prevention structure for a vacuum sewer system having a vacuum sewer pipe. In addition, an air inlet valve that opens and closes according to the change in the vacuum degree of the vacuum sewer pipe is provided.The air inlet valve opens automatically when the vacuum degree of the vacuum sewer pipe falls below a certain value and the air is vacuumed. It can be introduced into a water pipe and maintains a closed state when the vacuum degree of the vacuum sewer pipe exceeds a certain value.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, there is further provided an opening / closing adjusting means for adjusting the setting of the vacuum degree at which the opening / closing of the air introducing valve is switched.

According to a third aspect of the present invention, in addition to the second aspect of the present invention, the air introduction valve is screwed to the support provided around the air introduction port of the branch pipe. The opening / closing adjustment handle and a valve body connected to the opening / closing adjustment handle via a spring, and the opening / closing adjustment handle constitutes the opening / closing adjustment means.

[0014]

The air introducing valve which is opened at the critical vacuum degree P at the air introducing port provided so as to project from the vacuum sewer pipe to the above-ground portion by the branch pipe is provided. The branch pipes will be installed at a large upstream part of the lift of the vacuum sewer pipe or an upstream part of the lift near the end part of the vacuum sewer pipe. When the degree of vacuum is higher than the critical degree of vacuum P (when the degree of vacuum is normal), it is normally closed, and is the same as the conventional vacuum sewer pipe.

Since the vacuum sewer pipe generated by the water block has a rather low degree of vacuum, if the opening / closing switching timing of the air introduction valve is adjusted so that the degree of vacuum at this time becomes the critical degree of vacuum P, the water level is adjusted. When the block is generated, the air introduction valve opens and air flows into the vacuum sewer pipe.

In the conventional natural recovery mechanism when a water block is generated, it is difficult to wipe out the sewage in a full state including the lift unless the vacuum pressure in the downstream portion of the block becomes considerably high. Then, in order to completely eliminate the water block, it is necessary to restore the degree of vacuum in the downstream portion of the block and to inject air by operating a vacuum valve on the sewage mist side upstream of the blocked pipeline. This is because the expansion of the inflowing air gives a driving force to the dirty water, and the vacuum pressure at the downstream is propagated to the upstream by the through hole.

The air introduction valve of the present invention plays a role of more positively assisting such a conventional natural restoration mechanism.
Even if the vacuum valve on the sewage side is not opened, air will flow into the upstream side of the water block. And
The inflowing air imparts a propulsive force to the wastewater upstream of the water-blocked lift and conveys the wastewater downstream of the block as a mixed-layer flow. In addition, the degree of vacuum in the downstream of the pipeline decreases due to the inflow of air, so the vacuum source for collecting wastewater is activated, and as a result, the degree of vacuum in the downstream of the water block increases more than when the block was generated, and the effect of transport by inflowing air is increased. Combined with, the water block is automatically resolved. In this way, the air introduction mechanism that seems to temporarily work to reduce the vacuum level of the entire vacuum sewer system by the air inflow in a low vacuum state is effective as an auxiliary function to eliminate the water block early. Will work.

[0018]

1 is a schematic view showing a vacuum sewer system, FIG. 2 is a schematic view showing a main part of FIG. 1, FIG. 3 is a schematic view showing a vacuum valve, FIG. 4 is a sectional view showing a controller part, and FIG. Is another cross-sectional view showing the controller section, FIG. 6 is a schematic diagram showing a water block generation state, FIG. 7 is a schematic diagram showing a water block elimination state, FIG. 8 is a schematic diagram showing a normal atmospheric pressure state of the air introduction valve, FIG. 9 is a schematic view showing a closed state of the air introduction valve, FIG.
FIG. 4 is a schematic diagram showing an air introduction state by an air introduction valve.

As shown in FIGS. 1 and 2, the vacuum sewer system 10 has a sewage tank 11 connected to a sewage inflow pipe 12, and a suction pipe 13 communicating with the sewage tank 11 and a vacuum pipe communicating with a vacuum source. It has a vacuum valve 15 capable of opening and closing a connecting portion with the water pipe 14.

That is, the sewage discharged from each home or the like flows into the sewage basin 11 from the sewage inflow pipe 12 of the natural flow type.
Then, when the dirty water accumulates in the dirty water, the vacuum valve 15 opens,
The wastewater in the wastewater tank 11 is sucked through the suction pipe 13.
This sewage passes through the vacuum valve 15 and the vacuum sewer pipe 14
It is sucked into the wastewater and is collected by the wastewater collecting tank 16 on the vacuum pump, and then sent to a sewage treatment plant by a pressure pump.

At this time, in the vacuum sewer system 10, a serrated pipe line provided with a number of lifts 17 in the middle portion of the vacuum sewer pipe 14 is adopted to make the embedding depth of the vacuum sewer pipe 14 shallow, and thus the vacuum sewer pipe 14 There is a concealment 18 that can pass through obstacles such as rivers and underground pipes on the laying route. Then, these lifts 17 and the sieves 18 are the upstream vacuum sewer pipes 14A.
A low water level portion 19 is formed between the downstream vacuum sewer pipe 14B and the downstream vacuum sewer pipe 14B.

The vacuum valve 15 connects the first and second housings 21 and 22 to the band clamp 2 as shown in FIGS.
The valve body 24, the valve working chamber 25, the spring 26, and the controller portion 27 are integrally formed.

The valve body 24 opens and closes a connecting passage 28 which constitutes a connecting portion between the suction pipe 13 and the vacuum sewer pipe 14.

The valve working chamber 25 includes a valve valve body 24 and a valve rod 29.
The cup-shaped plunger 30 connected via the is slidably accommodated.

The spring 26 is the plunger 30 of the valve working chamber 25.
It is built in the upper chamber and exerts a spring force on the plunger 30 to give a closing force to the valve body 24.

The controller unit 27 applies a vacuum pressure to the valve working chamber 25 when the level of the sewage in the sewage tank 11 rises to give an opening force to the valve valve body 24 to open the vacuum valve 15 and open the suction pipe 13 Then, the vacuum sewer pipe 14 is electrically connected.

The controller section 27 is constructed as follows. The controller unit 27, as shown in FIG.
The fifth cylinder-shaped cases 51 to 55 are integrally formed with bolts. Normally, the fourth case 54 is integrated with the second housing 22 of the vacuum valve 15 by the band clamp 36.

The controller unit 27 has a water level detection pipe connection port 56 to which a water level detection pipe 37 communicating with the dirty water tank 11 is connected via a hose 38. The water level detection pipe connection port 56 is connected to the first case 51 via a diaphragm 59. A small through hole is provided in the diaphragm 59 so that pressure can be transmitted.

Further, the controller unit 27 has a vacuum pressure connection port 57 to which the vacuum sewer pipe 14 is connected via a hose 41.
Is provided in the third case 53.

Further, the controller section 27 has an atmospheric pressure connection port 58 to which the atmosphere communication pipe 43 is connected via a hose 44.
Is provided in the third case 53.

The first case 51 and the second case 52 are connected via a water level detection diaphragm 60. A push button composed of a plunger 61, a spring 63, and an elastic cover 62 is provided on the upper part of the first case 51 so that the water level detection diaphragm 60 can be manually displaced. The second case 52 has a plunger 65 under the diaphragm 60.
However, it is provided so as to reach the detection valve 68 installed in the third case 53. A shaft seal such as an O-ring 67 is provided around the insertion portion of the plunger 65 into the chamber 83 so that air does not leak into the upper chamber 83 as a pressure control chamber formed by the second case 52 and the third case 53. It is provided.

The detection valve 68 is arranged in the chamber 83 and is operated by the plunger 65 so that the vacuum force can be introduced into the chamber 83. That is, the third case 53 is provided with the passage 57A communicating with the vacuum pressure connection port 57, and the detection valve 68 can open and close the opening of the passage 57A to the chamber 83. The detection valve 68 is provided with a tongue piece 68B capable of closing the opening of the passage 57A at the tip of the leaf spring 68A, and when the leaf spring 68A is elastically pushed by the plunger 61, the tongue piece 68B.
Is separated from the opening of the passage 57A to open the opening, and the room 8
It is possible to introduce a vacuum force into the inside of 3. Reference numeral 66 is a return spring of the plunger 65.

Valve seats 72 and 73 are provided in the fourth case 54 and the fifth case 55, and an upper chamber 85 of the fourth case 54 is provided.
Communicates with the atmosphere through the passage 92, and the fifth case 5
The lower chamber 87 of No. 5 communicates with the vacuum sewer pipe through a passage 91. The chamber 86 formed by the lower part of the fourth case 54 and the upper part of the fifth case 55 has a passage 93 in the working chamber 25 of the vacuum valve body.
Through. The valve element 71 provided between the two valve seats 72 and 73 functions as a three-way valve so as to guide either the atmosphere or the vacuum to the chamber 86 by moving up and down. The valve body 71 is connected to a three-way valve diaphragm 70 provided between the third case 53 and the fourth case 54, and a compression spring 69 is provided above the diaphragm 70 and is pressed against the valve seat 73 of the fifth case 55. Has been. Third case 5
3 is provided with a partition wall, but partly has a communication port 88, and when the detection valve 68 is activated and opened, the upper chamber 83
The vacuum pressure applied to the lower chamber 84 is communicated with the lower chamber 84. Further, a needle valve 74 is provided in the upper chamber 83 of the third case 53 so that the atmosphere gradually enters through the needle valve 74.

The controller section 27 of the vacuum valve operates as follows. When the water level in the sewage masu 11 rises, the water level detection pipe 3
7, the air pressure in the hose 38 and the water level detecting diaphragm upper chamber 81 rises, and the water level detecting diaphragm lower chamber 82 communicates with the atmosphere, so that the water level detecting diaphragm 60 having a pressure difference is displaced downward.

The plunger 65 provided in the lower portion of the water level detecting diaphragm 60 is pushed by the displacement of the diaphragm 60 and is displaced downward, so that the detecting valve 68 provided in the upper chamber 83 of the third case 53 is pushed downward and opened.

The third case chamber 8 is activated by the operation of the detection valve 68.
The diaphragms 3 and 84 are evacuated and the lower chamber 85 of the three-way valve diaphragm 70 communicates with the atmosphere, so that the diaphragm 70 having a pressure difference is pulled downward, and the valve body 71 also rises accordingly. The chamber 86 that moves from the valve seat 73 of the fifth case 55 to the valve seat 72 of the fourth case 54 and communicates with the working chamber 25 of the vacuum valve body is brought into a vacuum state. As a result, the vacuum valve body is opened, and the wastewater in the wastewater tank is discharged into the vacuum sewer pipe 14.

When the liquid in the sewage masu is discharged, the water level lowers and the pressure applied to the water level detecting diaphragm 60 lowers,
It is pushed back by the spring 66 provided on the plunger 65, and the detection valve 68 is closed in the initial state accordingly.

Since the vacuum in the chamber 83 of the third case 53 is taken in by the atmosphere through the needle valve 74,
After a slight time lag, the atmosphere is restored, the pressure difference between the two sides of the three-way valve diaphragm 70 disappears, and the spring 69 pushes the valve back to its original state. The chamber is closed and the chamber communicating with the working chamber 25 of the vacuum valve body is brought to the atmospheric state. As a result, the vacuum valve body is closed.

As described above, in the vacuum sewer system 10, the wastewater discharged from households or the like is collected in the wastewater tank 11, and when a certain amount is reached, the vacuum valve 15 is automatically opened, and the wastewater, and subsequently the air is a vacuum sewer pipe. It flows into 14. Sewage and air become a mixed layer flow and are transported through the pipeline, and the sewage eventually becomes a downstream lift 1.
Retained in 7. Next, a vacuum valve 15 is opened somewhere, and when the air at that time passes through the lift 17 in which it is stagnant, a new mixed layer flow with sewage is created and is transported further downstream. The sewage thus transported is collected in the sewage sewage tank 16 and is pumped from here to a treatment plant or a public sewer pipe.

However, in the vacuum sewer system 10,
Sewage is always deposited on the low water level portion 19 formed, for example, in the sewer 18 (the lift 17 is the same) in the vacuum sewer pipe 14, and eventually the deposit causes a water block. The water block shuts off the propagation of this vacuum pressure to the upstream side even if the vacuum source provided in the water collection sewage system 16 applies a vacuum pressure to the vacuum sewer pipe 14, and as a result drives the vacuum valve 15. Then, even if the water level of the sewage tank 11 rises above a certain level, the vacuum valve 15 will not open, and the sewage will overflow in the sewage tank 11.
Vacuum type sewer is not established.

Therefore, the vacuum sewer system 10 has a water block preventing structure as shown in FIGS.
In the air inlet 102 of the branch pipe 101 connected to the upstream portion of the low water level portion 19 where the water block is likely to occur in the vacuum sewer pipe 14, an air inlet valve 103 that opens and closes according to the change in the vacuum degree of the vacuum sewer pipe 14 is provided. It is provided. The air introduction valve 103 creates a water block in the vacuum sewer pipe 14,
When the vacuum degree of the vacuum sewer pipe 14 becomes lower than the critical vacuum degree P, it is automatically opened so that air can be introduced into the vacuum sewer pipe 14 (FIG. 10). Vacuum sewage pipe 1 by this introduced air
A mixed layer flow of air and sewage is generated on the further downstream side in 4,
Eliminate the water block. And the air introduction valve 10
3 maintains the closed state (FIG. 9) when the vacuum degree of the vacuum sewer pipe 14 exceeds the critical vacuum degree P.

As shown in FIGS. 8 and 9, the air introduction valve 103 is provided with a fixture 11 around the air introduction port 102 of the branch pipe 101.
1A, a support 111 having a cylindrical shape with a ceiling, and an opening / closing adjustment handle 112 screwed onto the top surface of the support 111.
And a valve body 114 connected to the handle 112 via a spring 113. The valve body 114 includes a valve seat rubber 115.

FIG. 8 shows the air introduction valve 103 at normal atmospheric pressure (zero vacuum pressure). FIG. 9 shows a vacuum sewer pipe 14.
It is in the state when sufficient vacuum pressure is applied to the branch pipe 1
Since the inside of 01 also becomes a negative pressure, the negative pressure causes the spring 113 to expand and the air inlet 102 is closed by the valve body 114 (valve closed state).

The opening / closing adjusting handle 112 is an opening / closing adjusting means for adjusting the setting of the degree of vacuum at which opening / closing of the air introducing valve 103 is switched by adjusting the L value in FIG. Before starting common use or when the air introduction valve 103 is not necessary, it is preferable that the handle 112 is adjusted to L = 0 or more so as to be fully closed under atmospheric pressure.

The operation of the vacuum sewer 10 will be described below. (1) During normal operation of the vacuum sewer system 10, the vacuum source provided in the water collection sewage system 16 applies a vacuum pressure to the downstream side vacuum sewer pipe 14B to the upstream side vacuum sewer pipe 14A of the vacuum sewer pipe 14. When the level of the sewage in the sewage masu 11 exceeds a certain level, the vacuum valve 15 causes the upstream side vacuum sewer pipe 14A.
The vacuum pressure inside is opened as a driving power source, and the wastewater in the wastewater tank 11 is sucked from the suction pipe 13 through the vacuum valve 15 into the vacuum sewer pipe 14 and collected in the collected wastewater tank 16.

(2) When a water block occurs due to the accumulation of sewage in the low water level part 19 of the vacuum sewer system 10, the vacuum pressure of the vacuum source provided in the collecting water sewage basin 16 is reduced to the low water level part 1
It is cut off at 9 and does not reach the upstream vacuum sewer pipe 14A. At this time, when the vacuum degree of the low water level portion 19 becomes low and becomes lower than the critical vacuum degree P, the air introduction valve 103
Automatically opens to open the air inlet 102 of the branch pipe 101 to introduce the atmosphere to the upstream side of the low water level portion 19. As a result, the sewage deposits in the low water level portion 19 will not be collected in the upstream vacuum sewer pipe 1.
Air is blown by the pressure difference between the atmospheric pressure of 4A and the vacuum pressure of the downstream side vacuum sewer pipe 14B, and the water block is eliminated.

(3) When the water block is eliminated by the above (2), the air introduction valve 103 closes the air introduction port 102 of the branch pipe 101 again, and the vacuum of the vacuum source provided in the water collecting sewage system 16 is reduced. The pressure again reaches the upstream vacuum sewer pipe 14A, the stable operability of the vacuum valve 15 is restored, and the process returns to the above (1).

The operation of this embodiment will be described below.
An air introduction valve 103 that opens at a critical vacuum degree P is provided in an air introduction port 102 provided so as to project from the vacuum sewer pipe 14 to a ground portion by a branch pipe 101. The branch pipe 101 is installed at a large upstream portion of the lift of the vacuum sewer pipe 14 or at an upstream portion of the lift near the end of the vacuum sewer pipe 14. At a vacuum level higher than the critical vacuum level P (when the vacuum level is normal), it is normally closed and remains the same as the conventional vacuum sewer pipe 14.

Vacuum sewer pipe 14 which produces a water block
Since the degree of vacuum is somewhat low, if the opening / closing switching timing of the air introducing valve 103 is adjusted so that the degree of vacuum at this time becomes the critical degree of vacuum P, the air introducing valve 103 opens when the water block occurs. , Air is a vacuum sewer pipe 14
Flows into.

In the conventional natural recovery mechanism when a water block is generated, it is difficult to wipe out the full sewage including the lift unless the vacuum pressure in the downstream portion of the block becomes considerably high. Then, in order to completely eliminate the water block, it is necessary to recover the vacuum degree at the downstream portion of the block and to inject air by operating the vacuum valve 15 on the sewage tank 11 side upstream of the blocked pipeline. This is because the expansion of the inflowing air gives a driving force to the dirty water, and the vacuum pressure at the downstream is propagated to the upstream by the through hole.

The air introduction valve 103 of the present invention plays a role of more positively assisting such a conventional natural recovery mechanism, and even if the vacuum valve 15 on the sewage tank 11 side is not opened, air is introduced to the upstream side of the water block. Has been introduced. Then, the inflowing air gives a propulsive force to the water-blocked sewage upstream of the lift, and conveys the sewage downstream of the block as a mixed-layer flow. In addition, the degree of vacuum in the downstream part of the pipeline decreases due to the inflow of air, so the vacuum source of the wastewater collection sewage system 16 operates, and as a result, the degree of vacuum in the downstream part of the water block becomes higher than when the block was generated, and the transfer by inflowing air Combined with the effect, it automatically eliminates water blocks. In this way, the air introduction mechanism that seems to temporarily work to reduce the vacuum level of the entire vacuum sewer system by the air inflow in a low vacuum state is effective as an auxiliary function to eliminate the water block early. Will work.

[0052]

As described above, according to the present invention, the water block generated in the vacuum sewer can be automatically eliminated.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a vacuum sewer system.

FIG. 2 is a schematic diagram showing a main part of FIG.

FIG. 3 is a schematic diagram showing a vacuum valve.

FIG. 4 is a cross-sectional view showing a controller unit.

FIG. 5 is another cross-sectional view showing the controller unit.

FIG. 6 is a schematic diagram showing a water block generation state.

FIG. 7 is a schematic diagram showing a water block elimination state.

FIG. 8 is a schematic diagram showing a normal atmospheric pressure state of the air introduction valve.

FIG. 9 is a schematic diagram showing a closed state of an air introduction valve.

FIG. 10 is a schematic diagram showing an air introduction state by an air introduction valve.

[Explanation of symbols]

 10 vacuum sewer 14 vacuum sewer pipe 101 branch pipe 102 air inlet 103 air inlet valve 111 support 112 opening / closing adjustment handle 113 spring 114 valve body

Claims (3)

[Claims] 1. In a water block prevention structure for a vacuum sewer system having a vacuum sewer pipe, an air inlet of a branch pipe connected to the vacuum sewer pipe is opened / closed in response to a change in the degree of vacuum of the vacuum sewer pipe. The air inlet valve is installed to automatically open when the vacuum degree of the vacuum sewer pipe falls below a certain level and allow air to be introduced into the vacuum sewer pipe. A vacuum-type sewer water block prevention structure characterized by maintaining a closed state when the value is exceeded. 2. An opening / closing adjusting means for adjusting setting of a vacuum degree at which opening / closing of the air introducing valve is switched.
Vacuum block sewer water block prevention structure described. 3. The support body provided around the air supply port of the branch pipe, the opening / closing adjustment handle screwed to the support body, and the valve body connected to the opening / closing adjustment handle via a spring. The water block prevention structure for a vacuum sewer according to claim 2, wherein the opening and closing adjustment handle constitutes the opening and closing adjusting means.