JPH08319661A - Vacuum valve unit - Google Patents

Abstract

PURPOSE: To keep an air-liquid ratio in a vacuum sewer pipe within a proper range by stabilizing the valve opening time of a vacuum valve in spite of the lowering of vacuum pressure in the vacuum sewer pipe. CONSTITUTION: In a vacuum valve unit 10, which makes it possible to open and close the connecting section 28 of a sewage suction pipe 13 communicating with a sewage tank 11 and a vacuum sewer pipe 14 communicating with a vacuum source by a vacuum valve 15 and to operate the vacuum valve by vacuum pressure sent from a vacuum valve controller 27 to the vacuum valve, a check valve 200 sending vacuum pressure only towards the vacuum valve controller 27 from the vacuum sewer pipe 14 is installed in a vacuum pressure hose 41 communicating with the vacuum valve controller 27 and the vacuum sewer pipe 14. A vacuum pressure tank 203 holding vacuum pressure in the vacuum sewer pipe 14 and sending the vacuum pressure to the vacuum valve controller 27 is connected between the vacuum valve controller 27 and the check valve 200 in the vacuum pressure hose 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve unit suitable for use in a vacuum sewer system.

[0002]

2. Description of the Related Art As described in Japanese Patent Laid-Open No. 3-43527 and FIGS. 5 and 6, a vacuum type sewer system is provided with a vacuum valve for discharging sewage discharged from homes, factories, etc. from a natural flow type sewage inflow pipe 100. The sewage tank 102 of the unit 101 is caused to flow into the sewage tank 102, and the sewage collected in the sewage tank 102 is vacuumed into a sewer pipe 103
Are collected in the water collection tank 105 of the vacuum station 104 and then sent to the sewage treatment plant or the like by the pressure feed pump 106.

A vacuum valve 107 is installed in the vacuum valve unit 101, and is provided between a sewage suction pipe 108 raised from the bottom of the sewage tank 102 and a vacuum sewer pipe 103 connected to a vacuum pump 109 of a vacuum station 104. The communication part 110 of is opened and closed by the vacuum valve 107. The vacuum valve controller 110 selectively opens and closes the vacuum valve 107 via the vacuum pressure hose 111.
It is carried out by introducing the vacuum pressure in 3 to the vacuum valve 107 or by introducing the atmospheric pressure into the vacuum valve 107 via the atmospheric pressure hose 112.

That is, the pressure in the water level detection pipe 113 increases due to the rise of the sewage in the sewage tank 102, and this increase in pressure passes through the detection hose 114 and the vacuum valve controller 11
When it is transmitted to 0, an internal switch (not shown) in the vacuum valve controller 110 is activated to operate the vacuum sewer pipe 103.
The internal vacuum pressure is guided to the vacuum valve 107 via the vacuum pressure hose 111 and the vacuum valve controller 110. Then
This vacuum valve 107 opens a valve by moving a valve body (not shown) against the spring force of a spring (not shown).

On the other hand, when the water level in the dirty water tank 102 drops, the pressure in the water level detection pipe 113 drops, so the internal switch in the vacuum valve controller 110 is stopped and the vacuum sewer pipe 103 moves to the vacuum valve controller 110. The vacuum pressure does not act, and the breather pipe 115 is connected to the atmospheric pressure hose 112.
Via the vacuum valve controller 110 via the vacuum valve 107
Atmospheric pressure is introduced into. Then, this vacuum valve 107
The spring force causes the valve body to return and close.

Reference numeral 116 in FIG. 6 indicates a vacuum sewer pipe 1.
A check valve 117 applies a vacuum pressure only from 03 to the vacuum valve controller 110, and a reference numeral 117 is a ventilation pipe.

[0007]

In the vacuum valve unit 101 described above, since the spring force of the spring of the vacuum valve 107 is constant, when the vacuum pressure in the vacuum sewer pipe 103 decreases,
The valve opening time of the vacuum valve 107 is shortened. The vacuum valve unit 101 sucks the dirty water in the dirty water tank 102 into the vacuum sewer pipe 103 in the first half of the opening time of the vacuum valve 107, and sucks the air into the vacuum sewer pipe 103 in the latter half of the vacuum sewer pipe 103. In the case of the gas-liquid separation suction method in which the above-mentioned sucked dirty water is conveyed by this air, the suction amount of air is reduced by shortening the valve opening time of the vacuum valve 107, and therefore the inside of the vacuum sewer pipe 103 is reduced. The gas-liquid ratio will decrease. This decrease in the gas-liquid ratio is also promoted because the vacuum pressure in the vacuum sewer pipe 103 decreases and the amount of sewage and air sucked into the vacuum sewer pipe 103 decreases.

As described above, when the vacuum pressure of the vacuum sewer pipe 103 is lowered and the gas-liquid ratio of the sewage and air sucked into the vacuum sewage pipe 103 is lowered, the ability to convey the sewage by air is lowered. , When this phenomenon is repeated,
A water block (water seal) phenomenon may occur in the vacuum sewer pipe 103, which may adversely affect the wastewater collecting and conveying system.

The present invention has been made in view of the above circumstances, and stabilizes the valve opening time of the vacuum valve regardless of the decrease in the vacuum pressure in the vacuum sewer pipe, so that the gas-liquid in the vacuum sewer pipe can be stabilized. It is an object of the present invention to provide a vacuum valve unit capable of maintaining a ratio within an appropriate range and achieving stable operation of a vacuum type waste water collecting and conveying system.

[0010]

According to a first aspect of the present invention, a connecting portion between a sewage suction pipe communicating with a sewage tank and a vacuum sewer pipe communicating with a vacuum source can be opened and closed by a vacuum valve,
In a vacuum valve unit that operates the vacuum valve by a vacuum pressure applied to the vacuum valve from a vacuum valve controller, a vacuum pressure passage that connects the vacuum valve controller and the vacuum sewer pipe is provided with the vacuum sewer pipe from the vacuum sewer pipe. A check valve capable of applying a vacuum pressure only to the vacuum valve controller is installed, and a vacuum pressure in the vacuum sewer pipe is provided in the vacuum pressure passage between the vacuum valve controller and the check valve. A vacuum tank for holding and applying this vacuum pressure to the vacuum valve controller is connected.

According to a second aspect of the present invention, in the first aspect of the present invention, the vacuum pressure tank is installed in a passage branched from a vacuum valve controller and a check valve in the vacuum pressure passage. Is.

According to a third aspect of the present invention, in the first aspect of the present invention, the vacuum pressure tank is directly installed between the vacuum valve controller and the check valve in the vacuum pressure passage.

[0013]

The invention described in claims 1, 2 and 3 has the following effects. Since the vacuum pressure tank that holds the vacuum pressure in the vacuum sewer pipe and applies this vacuum pressure to the vacuum valve controller is connected between the vacuum valve controller and the check valve in the vacuum pressure passage, this vacuum pressure The vacuum pressure in the tank does not decrease (does not pressurize) due to the action of the check valve, even if the vacuum pressure in the vacuum sewer pipe decreases during operation of the vacuum valve.
Similarly, due to the action of the check valve, the highest vacuum pressure in the vacuum sewer pipe is maintained during one cycle from the opening of the vacuum valve to the opening of the next vacuum valve. Therefore, the vacuum pressure applied to the vacuum valve from the vacuum pressure tank via the vacuum valve controller is a substantially constant high vacuum pressure without being affected by the decrease in the vacuum pressure of the vacuum sewer pipe, so that the valve opening time of the vacuum valve is Stabilizes without fluctuation. Therefore, the flow rates of sewage and air sucked into the vacuum sewer pipe are appropriately maintained, and the gas-liquid ratio (ratio of air to sewage; usually air: sewage =
3: 1) is maintained in an appropriate range, and as a result, a decrease in the ability to convey dirty water in the vacuum sewer pipe caused by insufficient intake of air into the dirty water is avoided. Therefore, it is possible to suppress the water block (water seal) phenomenon in the vacuum sewer pipe that occurs due to the repeated decrease in the transport capacity of the sewage,
Stable operation of the collection and transportation system for sewage can be achieved.

Even if the water block phenomenon occurs in the vacuum sewer pipe, the valve opening time of the vacuum valve is stabilized by applying the vacuum pressure from the vacuum pressure tank. Therefore, even after the water block phenomenon occurs, Air can be sufficiently taken into the vacuum sewer pipe by operating the vacuum valve. As a result, the water block phenomenon can be eliminated early.

In the vacuum sewer system, a plurality of vacuum valve units are usually installed in the same vacuum sewer pipe, and one of the vacuum valve units is operated when the vacuum valve of another neighboring vacuum valve unit is activated. Since the vacuum pressure of the vacuum sewer pipe decreases, it is generally affected. However, in the present invention, since each vacuum valve unit is provided with the vacuum pressure tank that holds the vacuum pressure and applies a substantially constant vacuum pressure to the vacuum valve controller, each vacuum valve unit has the same vacuum sewer pipe. It is possible to always apply an appropriate vacuum pressure from the vacuum tank to the vacuum valve via the vacuum valve controller without being affected by the operation of the vacuum valve in another nearby vacuum valve unit installed in. As a result, each vacuum valve unit installed in the same vacuum sewer pipe can stabilize the valve opening time of the vacuum valve without being affected by the operation of other neighboring vacuum valve units, and the vacuum sewer pipe air Hold the liquid ratio at an appropriate value,
Stable operation of the sewage collection and transportation system can be achieved.

Further, the vacuum valve unit of the present invention does not have a complicated structure because the vacuum pressure tank is simply connected to the vacuum pressure passage which connects the vacuum valve controller of the conventional vacuum valve unit and the vacuum sewer pipe. Does not increase costs.

In particular, according to the third aspect of the invention, since the vacuum pressure tank is directly installed in the vacuum pressure passage which connects the vacuum sewer pipe and the vacuum valve controller, the vacuum sewer pipe is connected to the vacuum valve controller. Even if one sewage flows, this sewage flows into the vacuum pressure tank and does not reach the vacuum valve controller. Therefore, the inflow of dirty water into the vacuum valve controller can be prevented.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (1) First Embodiment FIG. 1 is a configuration diagram showing a first embodiment of the vacuum valve unit according to the present invention. FIG. 2 is a sectional view showing the vacuum valve of FIG. FIG. 3 is a sectional view showing the vacuum valve controller of FIG.

The vacuum valve unit 10 is, as shown in FIG.
A sewage inflow pipe 12 is connected to the sewage tank 11, and a vacuum valve 15 is provided which can open and close a connecting portion between a suction pipe 13 communicating with the sewage tank 11 and a vacuum sewer pipe 14 communicating with a vacuum source. are doing.

That is, the sewage discharged from each household or the like flows into the sewage tank 11 through the natural-flow-type sewage inflow pipe 12. Then, when the dirty water is accumulated in the dirty water, the vacuum valve 15 is opened, and the dirty water in the dirty water tank 11 is sucked through the suction pipe 13. Then, the sewage is sucked into the vacuum sewer pipe 14 through the vacuum valve 15, collected in the water collecting tank on the vacuum station, and then sent to the sewage treatment plant or the like by the pressure pump.

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 vacuum valve controller 27 are integrated.

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 the valve valve body 24 and the valve rod 2.
The cup-shaped plunger 30 connected via 9 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. A breather pipe 43 is connected to the chamber below the plunger 30 of the valve working chamber 25 via an atmospheric pressure hose 46 to be at atmospheric pressure.

The vacuum valve controller 27 is used for the dirty water tank 1
A vacuum pressure is applied to the upper chamber of the valve operating chamber 25 when the level of the sewage in 1 rises, and the plunger 30 is pulled up by the differential pressure between the upper and lower chambers (the lower chamber is the atmospheric pressure) to open the valve valve body 24. Then, the vacuum valve 15 is opened and the vacuum sewer pipe 14 is connected to the suction pipe 13.

The vacuum valve controller 27 is constructed as follows. As shown in FIG. 3, the vacuum valve controller 27 is configured by integrating first to fifth cylindrical cases 51 to 55 with through bolts.

The vacuum valve controller 27 has a liquid level detection pipe connection port 56 to which a liquid level detection pipe 37 communicating with the dirty water tank 11 is connected via a detection hose 38. The liquid level detection pipe connection port 56 is connected to the first case 51 via a vibration damping prevention diaphragm 59. A small through hole is provided in the diaphragm 59 so that pressure can be transmitted, and the outer peripheral portion of the diaphragm 59 is not fixed, so that air from the lower side can also pass around the diaphragm 59. ing.

The vacuum valve controller 27 also has a vacuum pressure connection port 57 in the third case 53 to which the vacuum sewer pipe 14 is connected via the vacuum pressure hose 41.

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

The first case 51 and the second case 52 are connected via a liquid 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 liquid 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. 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 has the passage 57A communicating with the vacuum pressure connection port 57, and the detection valve 68 can open and close the opening (vacuum port) of the passage 57A to the chamber 83. 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 96 in the working chamber 25 of the vacuum valve body.
Through. The valve body 71 provided between the two valve seats 72 and 73 plays a role as a three-way valve so as to guide either the atmosphere or the vacuum to the chamber 86 by sliding 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
A partition is provided in the case 53, but the communication port 8 is partially provided in the case 53.
8 is provided so that the vacuum pressure applied to the upper chamber 83 when the detection valve 68 is activated and opened is communicated to the lower chamber 84.

Further, a needle valve 74 with a diaphragm as a vacuum force release valve is provided in a passage 93 which communicates the inside and outside of the upper chamber 83 (pressure control chamber) of the third case 53, and passes through the needle valve 74. The atmosphere is gradually coming in.

The diaphragm 75 is attached to the needle valve 74, and the needle valve 74 is equilibrated by the pressure of the spring 76 and the vacuum pressure of the vacuum sewer pipe 14 communicating with the passage 95, and the needle valve 74 is placed at an appropriate position. It is designed to be displaced. That is, when the vacuum degree of the vacuum sewer pipe 14 is high, the needle valve 74 is opened greatly, and when the vacuum degree is low, the needle valve 74 is opened small.

The controller section 27 of the vacuum valve operates as follows. When the liquid level of the sewage in the sewage tank 11 rises, the liquid level detection pipe 37, the detection hose 38, the vibration control diaphragm 59.
Since the air pressure in the liquid level detecting diaphragm upper chamber 81 rises through the minute holes of the liquid level detecting diaphragm and the liquid level detecting diaphragm lower chamber 82 communicates with the atmosphere through the passage 94, the liquid level detecting diaphragm 60 having a pressure difference is generated. Is displaced downward.

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

When the plunger 65 is displaced by a certain amount (the liquid level of sewage rises to a certain level), the detection valve 68 is reversed and the vacuum port of the passage 57A is opened.

Due to the opening operation of the detection valve 68, the third case chambers 83 and 84 are evacuated, and the lower chamber 85 of the three-way valve diaphragm 70 communicates with the atmosphere through the passage 92, so that a pressure difference is generated. The diaphragm 70 is pulled up, and the valve body 71 also rises accordingly, and the fifth case 55
From the valve seat 73 to the valve seat 72 of the fourth case 54, and the chamber 86 and the passage 96 communicating with the upper chamber of the working chamber 25 of the vacuum valve body are brought into a vacuum state. As a result, the vacuum valve 15 is opened by the differential pressure between the upper and lower chambers of the working chamber 25 (the lower chamber is atmospheric pressure), and the sewage tank 1 is operated by the atmospheric pressure from the ventilation pipe 77.
Sewage in 1 is discharged into the vacuum sewer pipe 14.

When the liquid in the dirty water tank 11 is discharged, the liquid level lowers, the pressure applied to the liquid level detecting diaphragm 60 lowers, the plunger 65 is pushed back by the return spring 66, and the vibration damping diaphragm 59 is pressed. Air immediately escapes from the outer edge.

The detection valve 68 that had been reversed returns to the passage 5
The vacuum port of 7A is closed, and the vacuum is not introduced into the chambers 83 and 84.

In the chambers 83 and 84 of the third case 53, a needle valve 74 is provided depending on the degree of vacuum pressure of the vacuum sewer pipe 14.
Keeps an appropriate opening, the passage 93, the detection diaphragm 60
Since the atmosphere is introduced through the chamber 82 and the passage 94 in the lower part of the three-way valve, the atmosphere becomes a little delayed, and the three-way valve diaphragm 70 loses the pressure difference between both sides and is pushed by the spring 69 to return to the original state. The valve body 71 also closes the original valve seat 73 of the fifth case 55, and brings the chamber 86 communicating with the working chamber 25 of the vacuum valve main body to the atmospheric state.

Atmosphere flows into the upper chamber of the operation chamber 25 of the vacuum valve 15 through the atmosphere communication pipe 43, the atmospheric pressure hose 44, the atmospheric pressure connection port 58 of the vacuum valve controller 27, the chamber 86 and the passage 96, and operates. The pressure difference between the upper and lower chambers of the chamber 25 disappears and the vacuum valve 15 is closed.

In the vacuum valve unit 10 shown in FIG.
As shown in, the vacuum sewer pipe 14 and the vacuum valve controller 2
A check valve 200 is installed on the vacuum pressure hose 41 that communicates with the valve 7. With this check valve 200, the vacuum sewer pipe 14
The vacuum pressure is applied only to the vacuum valve controller 27.

Furthermore, the check valve 20 is attached to the vacuum pressure hose 41.
0 and the vacuum valve controller 27, a branch hose 202 is connected via a three-pronged 201, and the branch hose 20
A vacuum pressure tank 203 is installed at 2. This vacuum pressure tank 203 introduces and holds the vacuum pressure from the vacuum sewer pipe 14 through the vacuum pressure hose 41, the check valve 200, and the branch hose 202, and holds the held vacuum pressure in the branch hose 202 and the vacuum. The pressure is applied to the vacuum valve controller 27 via the pressure hose 41.

Therefore, the vacuum valve unit 10 of the above embodiment
Has the following actions and effects. Between the vacuum valve controller 27 and the check valve 200 in the vacuum pressure hose 41, a vacuum pressure tank 203 that holds the vacuum pressure in the vacuum sewer pipe 14 and applies this vacuum pressure to the vacuum valve controller 27 is branched. Since the vacuum pressure in the vacuum pressure tank 203 is connected through the hose 202, even if the vacuum pressure in the vacuum sewer pipe 14 is reduced during the operation of the vacuum valve 15, the vacuum pressure of the check valve 200 is reduced. Under the vacuum in one cycle from the opening of the vacuum valve 15 to the opening of the next vacuum valve 15 by the function of the check valve 200, the check valve 200 does not decrease (pressurize). The highest vacuum pressure in the water tube 14 is maintained. (When the vacuum pressure in the vacuum sewer pipe 14 increases, the check valve 200 acts to replace the increased vacuum pressure with the vacuum pressure in the vacuum tank 203.)

Therefore, the vacuum pressure applied from the vacuum pressure tank 203 to the valve operating chamber 25 of the vacuum valve 15 via the vacuum valve controller 27 is not affected by the decrease in the vacuum pressure of the vacuum sewer pipe 14 and is substantially constant. Since the pressure is applied, the valve opening time of the vacuum valve 15 does not fluctuate and is stabilized. Therefore, the flow rate of the sewage and the air sucked into the vacuum sewage pipe 14 through the sewage suction pipe 13 is appropriately maintained, and the gas-liquid ratio (ratio of air to sewage; usually air : Sewage = 3:
1) is maintained in an appropriate range, and as a result, a decrease in the wastewater transporting capability in the vacuum sewer pipe 14 caused by insufficient intake of air into the wastewater is avoided. Therefore, it is possible to suppress the water block (water seal) phenomenon in the vacuum sewer pipe 14 that occurs due to the repeated reduction of the waste water transporting capacity, and it is possible to achieve stable operation of the waste water collecting and transporting system.

Even if the water block phenomenon occurs in the vacuum sewer pipe 14, the opening time of the vacuum valve 15 is stabilized by applying the vacuum pressure from the vacuum pressure tank 203. Therefore, after the water block occurs, Also, the air can be sufficiently taken into the vacuum sewer pipe 14 by operating the vacuum valve 15. As a result, the water block phenomenon can be eliminated early.

A plurality of vacuum valve units 10 are usually installed in the same vacuum sewer pipe 14, and one of these vacuum valve units 10 operates when the vacuum valve 15 of another nearby vacuum valve unit 10 is activated. Since the vacuum pressure of the vacuum sewer pipe 14 decreases, it is generally affected. But,
In the present embodiment, since each vacuum valve unit 10 is provided with the vacuum valve tank 203 that holds the vacuum pressure and applies a substantially constant vacuum pressure to the vacuum valve controller 27, each vacuum valve unit 10 is the same. Regardless of the operation of the vacuum valve 15 in another nearby vacuum valve unit 10 installed in the vacuum sewer pipe 14, a vacuum pressure of a suitable value is always supplied from the vacuum pressure tank 203 to the vacuum valve 15 via the vacuum valve controller 27. Can act on. As a result, the respective vacuum valve units 10 installed in the same vacuum sewer pipe 14 can stabilize the valve opening time of the vacuum valve 15 without being affected by the operation of other nearby vacuum valve units 10. Therefore, the gas-liquid ratio of the vacuum sewer pipe 14 can be maintained within an appropriate range, and the sewage collection and transportation system can be stably operated.

Here, as shown in FIG. 6, in the conventional vacuum valve unit 101 having no vacuum pressure tank 203, the vacuum valve controller 1 in the vacuum pressure hose 111 is used.
As shown in FIG. 8, it can be seen that the vacuum pressure on the side of 10 is drastically reduced when the vacuum valve 107 in another nearby vacuum valve unit 101 is activated (arrows a and b in FIG. 8). , C). For this reason, the vacuum valve unit 101 may be affected by the operation of the vacuum valve 107 in another nearby vacuum valve unit 101, and normal operation may not be performed.

On the other hand, in the vacuum valve unit 10 including the vacuum pressure tank 203 shown in FIG. 1, the vacuum pressure on the vacuum valve controller 27 side in the vacuum pressure hose 41 is as follows.
As shown in FIG. 7, even if the vacuum valve 15 in another nearby vacuum valve unit 10 is actuated, the pressure is not affected and the pressure becomes constant, and the vacuum valve 15 opens and then opens. The highest pressure in the vacuum sewer pipe 14 is maintained during the cycle. For this reason, the vacuum valve unit 10 including the vacuum pressure tank 203 is different from the other vacuum valve units 10 in the vicinity.
The valve opening time is not affected by the operation of the vacuum valve 15 and always operates normally to maintain the optimum valve opening time.

Further, the vacuum valve unit 10 includes the vacuum valve controller 110 (2) of the conventional vacuum valve unit 101.
7) and the vacuum pressure hose 111 (41) communicating with the vacuum sewer pipe 103 (14) are simply connected to the vacuum pressure tank 203 via the branch hose 202, so that the structure is not complicated and the cost is increased. There is no.

(2) Second Embodiment FIG. 4 is a configuration diagram showing a second embodiment of the vacuum valve unit according to the present invention. In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the vacuum valve unit 210 of the second embodiment, the vacuum pressure tank 203 is installed directly between the check valve 200 and the vacuum valve controller 27 in the vacuum pressure hose 41. Therefore, in this vacuum valve unit 210 as well as the vacuum valve unit 10 of the first embodiment,
Produces the effect of.

In addition, in this vacuum valve unit 210,
Since the vacuum pressure tank 203 is directly installed on the vacuum pressure hose 41 that connects the vacuum sewer pipe 14 and the vacuum valve controller 27, the vacuum sewer pipe 14 is connected to the vacuum valve controller 27.
Even if sewage flows toward, the sewage flows into the vacuum pressure tank 203 and does not reach the vacuum valve controller 27. Therefore, the inflow of dirty water into the vacuum valve controller 27 can be prevented.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, although the vacuum tank 203 is described as being installed inside the dirty water tank 11, it may be installed outside the dirty water tank 11.

[0056]

As described above, according to the vacuum valve unit of the present invention, the valve opening time of the vacuum valve is stabilized regardless of the decrease in the vacuum pressure in the vacuum sewer pipe, and the gas-liquid in the vacuum sewer pipe is stabilized. The ratio can be maintained in an appropriate range, and stable operation of the vacuum type wastewater collection and transfer system can be achieved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a vacuum valve unit according to the present invention.

FIG. 2 is a cross-sectional view showing the vacuum valve of FIG.

FIG. 3 is a cross-sectional view showing the vacuum valve controller of FIG.

FIG. 4 is a configuration diagram showing a second embodiment of the vacuum valve unit according to the present invention.

FIG. 5 is a perspective view showing a vacuum sewer system including a vacuum valve unit.

FIG. 6 is a configuration diagram showing a conventional vacuum valve unit.

FIG. 7 is a graph showing changes in vacuum pressure at the inlet of the vacuum valve controller in the vacuum valve unit of FIG.

8 is a graph showing a change in vacuum pressure at the inlet of the vacuum valve controller in the vacuum valve unit of FIG.

[Explanation of symbols]

 10 Vacuum Valve Unit 11 Sewage Tank 13 Sewage Suction Pipe 14 Vacuum Sewage Pipe 15 Vacuum Valve 27 Vacuum Valve Controller 28 Connection 41 Vacuum Pressure Hose 200 Check Valve 202 Branch Hose 203 Vacuum Pressure Tank 210 Vacuum Valve Unit

Claims (3)

[Claims] 1. A vacuum valve opens and closes a connecting portion between a sewage suction pipe communicating with a sewage tank and a vacuum sewer pipe communicating with a vacuum source, and a vacuum pressure applied from a vacuum valve controller to the vacuum valve causes In a vacuum valve unit that operates a vacuum valve, a vacuum pressure passage that connects the vacuum valve controller and the vacuum sewer pipe to each other is such that a vacuum pressure can be applied only from the vacuum sewer pipe to the vacuum valve controller. A stop valve is installed, the vacuum pressure passage holds the vacuum pressure in the vacuum sewer pipe between the vacuum valve controller and the check valve, and applies the vacuum pressure to the vacuum valve controller. A vacuum valve unit characterized by connecting a vacuum tank. 2. The vacuum valve unit according to claim 1, wherein the vacuum pressure tank is installed in a passage branched from between the vacuum valve controller and the check valve in the vacuum pressure passage. 3. The vacuum valve unit according to claim 1, wherein the vacuum pressure tank is directly installed between the vacuum valve controller and the check valve in the vacuum pressure passage.