JP2860525B2 - Exhaust valve device for vacuum type wastewater collection and drainage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust valve device for a tank used in a vacuum type sewage collection and drainage system for drainage treatment in a local municipal or mountain village.

[0002]

2. Description of the Related Art According to a vacuum sewer system, which is recently attracting attention in local municipalities and mountain villages where the maintenance of sewer systems is urgently needed, domestic sewage discharged from households and the like flows into sewage sewage by natural flow. The sewage is then sent to a vacuum sewage collection and drainage device via a vacuum sewer pipe. When a certain amount of sewage accumulates in the tank, the sewage is sent from a pump to a purification plant via a pump pipe. An exhaust port communicating with a vacuum pump for sucking sewage in a vacuum sewer pipe is provided at the top of the tank of the vacuum type sewage collection and drainage device, and the exhaust port is provided with a butterfly valve v of the type shown in FIG. It is the prevention of sewage intrusion Te.

[0003]

When the level of the sewage in the tank increases and reaches an upper limit, the upper limit level switch detects this and stops the vacuum pump, and then starts a pressure pump such as a bladeless pump. It is configured to be.
However, if the upper level switch causes troubles such as time lag due to dirt or scum, the water level rises rapidly, and the conventional butterfly valve causes a wastewater ejector phenomenon to cause wastewater to enter the vacuum pump. There is a risk of doing so. It is an urgent task to solve this problem in the vacuum sewage collection and drainage system at the trial stage.

Accordingly, an object of the present invention is to completely prevent sewage from entering the vacuum pump from an exhaust port when a trouble or time lag occurs in a level switch for detecting the upper limit of sewage and there is a sharp rise in water level. An object of the present invention is to provide an exhaust valve device in which a butterfly valve is quickly brought into contact with a valve seat to block an exhaust port.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a suction port to which a vacuum sewer pipe is connected, and a discharge port to which a pressure feed pipe communicating with a purification treatment plant is connected, and sucks sewage in the vacuum sewer pipe. In the exhaust valve device for a vacuum-type wastewater collecting / draining tank provided with an exhaust port communicating with a vacuum pump to be provided, a downwardly projecting valve seat is provided to form a through-hole communicating with the exhaust port.
A butterfly valve made of a resilient material whose one end is fixed and which opens and closes the through -hole by swinging, and a spherical float is provided on the back surface of the butterfly valve.

[0006]

According to the exhaust valve device of the vacuum type wastewater collecting / draining tank configured as described above, when the level of the wastewater in the tank increases and reaches the upper limit, the level switch which normally detects the upper limit of the wastewater is used. And the vacuum pump stops. At this time, the exhaust port communicating with the vacuum pump is opened while the butterfly valve is kept away from the valve seat. However, when the water level of the sewage increases and reaches the upper limit, if a trouble or a time lag occurs in the level switch and the water level of the sewage rises sharply, the butterfly valve is seated by the buoyancy of the spherical float. Before the wastewater reaches the valve seat, the wastewater contacts the valve seat and closes the exhaust port, so that the wastewater does not flow into the vacuum pump. Therefore, it is possible to prevent a trouble such as a water lock caused by the suction of the sewage into the vacuum pump. Further, when the wastewater is sent to the purification treatment plant side by the pressure pump and the water level starts to decrease, the butterfly valve gradually separates from the valve seat and the exhaust port is opened. When the level switch for detecting the lower limit of the sewage is activated, the pump is stopped, and the vacuum pump is started again to start sucking the sewage in the vacuum drain into the tank.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an exhaust valve device, FIG. 2 is a vertical side view of the same, FIG. 3 is a vertical side view of a vacuum type sewage collecting and draining device. 4 is an explanatory diagram showing the relationship between the change in water level and the inflow time by dividing the tank in the radial direction.

In FIGS. 1 and 2, V denotes an exhaust valve device. The exhaust valve device V has a valve seat 2 protruding below a flange 1 and has a through hole 3 formed at the center thereof. One end 5 of a butterfly valve 4 made of an elastic material is fixed to the flange 1 with a screw 8. The butterfly valve 4 has a well-known structure in which the through hole 3 is opened and closed by coming into contact with or away from the valve seat 2 by swinging. A tough canvas material is inserted into a bent portion 6 of the butterfly valve 4 to reinforce it. 7 may be buried. A hollow spherical float 9 is fixed to the center of the back surface of the butterfly valve 4 with a bolt 10.

In addition, the butterfly valve 4 may be configured such that a ring-shaped mounting portion surrounding the outer periphery of the valve seat 2 is integrally provided, and the mounting portion is fixed to the flange 1.

FIG. 3 shows a vacuum sewage collecting and draining device Z to which the exhaust valve device V of the present invention is applied. The vacuum-type sewage collection and drainage device Z is provided with a cylindrical tank a for storing sewage, an intake port b to which a vacuum sewer pipe k is connected above the tank a, and communication therebelow with a purification plant. It has a discharge port c to which the pressure feed pipe d is connected. The top portion e of the tank a is provided with an exhaust port f communicating with a vacuum pump p for sucking sewage in the vacuum sewer pipe k, and the exhaust valve device V of the present invention is attached to the exhaust port f. I have. If the vacuum pump p is a roots type multi-stage vacuum pump, the motor output is 7.5 to 11K.
W is desirable, and a vacuum of about 700 mmHg is generated to suck the air in the tank a. For automatically driving alternating vacuum pump p and the pressure pump g, was placed a limit level switch s ₁ and a lower level switch s ₂ for detecting the water level L of sewage in the tank a, the detection signal, switches the relay box The signal is transmitted to the control device i of the motor that drives the pumps p and g via h.

According to the exhaust valve device V for the vacuum type wastewater collecting and draining tank constructed as described above, when the water level L of the wastewater in the tank a increases and reaches the upper limit, it is switched to the upper limit level switch s. Detected at ₁ , the vacuum pump p stops.
At this time, the through hole 3 communicating with the vacuum pump p is opened while the butterfly valve 4 is kept away from the valve seat 2. Thus, when the water level L of sewage has reached the upper limit increases, when trouble or time lag there is sudden level rise sewage generated is temporarily in the level switch s _1, a butterfly valve 4
Before the sewage reaches the valve seat 2 due to the buoyancy of the spherical float 9, the sewage contacts the valve seat 2 and closes the through hole 3, so that the sewage does not flow into the vacuum pump p side. Therefore, troubles such as water lock caused by the suction of the sewage into the vacuum pump p can be avoided. When the sewage is sent to the purification treatment plant side by the pressure pump g and the water level L starts to decrease, the butterfly valve 4 gradually separates from the valve seat 2 to open the through hole 3 (in a normal state, the butterfly valve 4 is 2). When the lower level switch s ₂ this reduces the level L wastewater is discharged is detected, piezoelectric pumped g stops, the vacuum sewage pipe k by starting again vacuum pump p
The suction of the sewage in the tank a is started.

Next, the relationship between the water level change in the tank and the inflow time will be considered. As shown in FIG. 4, the tank is divided into ten parts in the radial direction, and the inflow time with respect to the water level change is calculated by the following equation.

[0013]

(Equation 1)

[0014]

(Equation 2)

[0015]

(Equation 3)

[0016]

(Equation 4)

[0017]

[Table 1]

In the above formula, r is the radius of the tank, C
Is the surface width of the divided water level, l is the outer peripheral length of the divided water level, n is each divided water level, A is the area of each divided water level, t is the inflow time of wastewater into the tank, L is the length of the tank, Q Denotes the inflow, where r = 1 m, L = 1.6 m, Q = 1 m ³ /
The value of min. As a result, in the above table, the water level rises by 0.3 m in about 30 seconds when the sewage is almost full, so that the exhaust valve device must quickly respond to the rapid rise in water level and close the exhaust port. It is clear that.

[0019]

The present invention has the above-described structure and operation, and the butterfly valve has an excellent effect of rapidly contacting the valve seat and closing the through hole by the buoyancy of the spherical float. Moreover, in the vacuum-type wastewater collecting and draining device to which the exhaust valve device is applied, even if a trouble or time lag occurs in the level switch for detecting the upper limit of the wastewater in the tank and the water level of the wastewater suddenly rises, the wastewater is discharged. This has the secondary effect of completely preventing entry into the vacuum pump.

[Brief description of the drawings]

FIG. 1 is a perspective view of an exhaust valve device.

FIG. 2 is a longitudinal side view of the same.

FIG. 3 is a longitudinal side view of a vacuum type wastewater collecting and draining device.

FIG. 4 is an explanatory diagram showing a relationship between a change in water level and an inflow time by dividing a tank in a radial direction.

FIG. 5 is a longitudinal sectional side view of a conventional butterfly valve.

[Explanation of symbols]

L → Sewage water level V → Exhaust valve device Z → Evacuated wastewater collection / drainage device a → Tank b → Suction port c → Drain port d → Pressure pipe e
→ top portion f → outlet g → pressure pump h → switch relay box i → controller k → vacuum sewage pipe p → vacuum pump s ₁ → upper level switch s ₂ → lower level switch 1 → flange 2 → valve seat 3 → Through hole 4 → Butterfly valve 5 → One end 6 → Bend 7 → Core 8 → Screw 9 → Spherical float
10 → bolt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 24/04 E03F 1/00 E03F 5/22 F16K 31/22

Claims (1)

(57) [Claims] 1. An exhaust port connected to a vacuum sewer pipe and an outlet connected to a pressure feed pipe communicating with a purification treatment plant, and an exhaust port connected to a vacuum pump for sucking sewage in the vacuum sewer pipe. In the exhaust valve device for a vacuum-type wastewater collecting / draining tank provided with a valve seat, a downwardly protruding valve seat is provided.
A butterfly valve made of an elastic material having one end fixed and swinging to open and close the through hole is provided on a flange having a through hole formed therein , and a spherical float is provided on the back surface of the butterfly valve. An exhaust valve device for a tank for collecting and draining vacuum-type wastewater, wherein the exhaust valve device is provided.