JPH07317954A - Vacuum valve with impurity cutting structure - Google Patents

Abstract

PURPOSE:To prevent impurities held between a valve body and a valve seat, by providing cutter means to cut the impurities at the fluid passing part of a housing which has a fluid passing part and a valve seat, in a vacuum valve in a vacuum type sewerage system and the like. CONSTITUTION:A vacuum valve set in a house-inlet, in a vacuum type sewerage system, has a function to open and close a fluid passing part 28 provided between a sewerage suction pipe communicating to a houseinlet, and a vacuum sewerage pipe communicating to a vacuum source, and it has a valve seat 20, a main valve 24, a valve rod 29, a valve operating chamber, and the like. In this case, a seal rubber 91 and a tip seal presser 92 are provided immediately below the main valve 24 fixed to the tip of the valve rod 29, and cutter edges 94 and 95 are provided along the outer periphery of the tip seal presser 92, and the inner periphery of the valve seat 20 respectively. At the closing operation of the vacuum valve 2, the impurities attached to the seal parts of the main valve 24 and the valve seat 20 are cut by both cutter edges 94 and 95, and exhausted, so as to secure the airtightness of the seal parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve, and more particularly to a vacuum valve with a foreign matter cutting mechanism suitable for use in a vacuum sewer system.

[0002]

2. Description of the Related Art As shown in FIG. 6, a vacuum type sewer system allows sewage from households to flow into a sewage tank 1 with a vacuum valve, and when a certain amount is reached, a vacuum valve 2 is opened and installed in a vacuum station 3. The sewage is sucked into the vacuum sewer pipe 5 whose pressure is reduced by the vacuum pump 4 which is operated. Then, this sewage is conveyed to the water collection tank 6 and is pressure-fed by the pressure feed pump 7 to the free-flowing type sewer.

At this time, the vacuum valve 2 opens and closes a connecting portion (fluid passage portion) between the sewage suction pipe 1A communicating with the sewage tank 1 and the vacuum sewer pipe 5. A housing provided with a valve seat, a valve body provided in the housing to open and close the fluid passage portion by opening and closing the valve seat, a pressing means for pressing the valve body against the valve seat, and a resistance against the pressing means. And a valve working chamber to which a vacuum pressure for separating the valve body from the valve seat acts.

However, in the prior art, as described in Japanese Patent Application Laid-Open No. 5-240373, foreign matter such as pebbles is caught in the gap between the valve body and the casing when the valve is operated, so that the valve body can be fully closed. In some cases, the inner wall of the casing is inflated outward from the vicinity of the valve seat to prevent the vacuum system of the entire system from being lowered and the vacuum sewer system to stop functioning.

[0005]

However, in the prior art, for example, thread-like elongated impurities (eg straw, string, vinyl rope, etc.) contained in the fluid passing through the vacuum valve are closed. When the valve body and the valve seat are caught by entanglement or the like during operation, this cannot be eliminated. As described above, if foreign matter enters the fluid passage portion of the vacuum valve and continues to be sandwiched between the valve body and the valve seat, the valve body cannot be fully closed, and the airtightness of the vacuum valve is hindered. , The vacuum level of the entire system is reduced and the vacuum sewer system stops functioning.

An object of the present invention is to prevent foreign substances from being trapped between the valve body and the valve seat even if the foreign substances are mixed in the fluid passing through the vacuum valve.

[0007]

The present invention according to claim 1 provides a housing having a fluid passage portion and a valve seat, and a fluid passage portion provided in the housing and brought into contact with and separated from the valve seat. A vacuum valve having a valve body for opening and closing the valve, a pressing means for pressing the valve body against the valve seat, and a valve working chamber on which a vacuum pressure acts to separate the valve body from the valve seat against the pressing means. In the above, the fluid passage portion of the housing is provided with a cutter means for cutting foreign matters.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the cutter means is provided with a cutter blade at a tip portion of the valve body and a downstream portion of the valve seat. It was designed to be done.

[0009]

According to the present invention as set forth in claim 1, the following effects are obtained. The impurities mixed in the fluid passing through the vacuum valve are
As a result of being cut by the cutter means provided in the fluid passage part, even when the vacuum valve is closed, it does not get caught between the valve body and the valve seat due to entanglement, etc., and smoothly flows down to the downstream side of the valve. Will be things. This ensures that the vacuum valve is fully closed and can be kept airtight.

The present invention according to claim 2 has the following effects. Since a cutter blade is provided at the tip of the valve body and the downstream portion of the valve seat, when the vacuum valve is closed, foreign matter adhering to the seal between the valve body and the valve seat is automatically cut by the cutter blade. Then, the airtightness of the seal portion is maintained.
The cut contaminants flow down to the valve downstream side by the time the vacuum valve is fully closed, or flow down to the valve downstream side together with the fluid (dirt water) that passes when the valve is opened next time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a wastewater tank to which the first embodiment of the present invention is applied, FIG. 2 is a schematic diagram showing a vacuum valve, FIG. 3 is a sectional view showing a control part of the vacuum valve, and FIG. 4 is another cross-sectional view showing the control part of the vacuum valve, FIG. 5 is an enlarged view of the main part of the vacuum valve, FIG.
[Fig. 3] is a schematic diagram showing a vacuum sewer system.

The vacuum sewer system is constructed as shown in FIG. 6 described above, and a vacuum valve 2 is installed in a wastewater tank 1.
The vacuum valve 2 is operated by being supplied with the atmosphere introduced by the atmosphere communication pipe 8 and communicates with the sewage tank 1.
The fluid passage 28 between A and the vacuum sewer pipe 5 communicating with the vacuum source can be opened and closed.

That is, the sewage discharged from each household or the like flows into the sewage masu 1 from the natural-flow-type sewage inflow pipe 10.
Then, when a predetermined amount of dirty water is accumulated in the dirty water tank 1, the vacuum valve 2
The sewage in the sewage tank 1 is sucked through the sewage suction pipe 1A. At this time, air is supplied to the inside of the sewage tank 1 through a ventilation pipe 9 which is erected on the ground, and the sewage suction pipe 1A also sucks the air together with the sewage, and the sewage flows in the vacuum sewer pipe 5 by its two-phase flow. Is moved to the sewage treatment plant or the like by the pressure pump 7.

The vacuum valve 2 is a first valve as shown in FIGS.
And the second housings 21 and 22 with the band clamp 23
The housing 21 is provided with the aforementioned fluid passage portion 28 and the valve seat 20. Further, the vacuum valve 2 is provided in the housing 21 and is installed in the valve seat 2
The main valve 24 (valve body) that opens and closes the fluid passage portion 28 by contacting and separating with 0, the closing force applying spring 26 (pressing means) that presses the main valve 24 against the valve seat 20, and the closing force applying spring 26. And a valve working chamber 25 against which a vacuum pressure acts to separate the main valve 24 from the valve seat 20. The vacuum valve 2 also has a control unit 27 that controls the application of vacuum pressure to the valve working chamber 25.

The valve working chamber 25 slidably accommodates a plunger 30 having a cup-shaped rolling diaphragm which is connected to the main valve 24 via a valve rod 29.

The closing force applying spring 26 is built in the chamber above the plunger 30 of the valve operating chamber 25, exerts a spring force on the plunger 30 and applies a closing force to the main valve 24.

The control unit 27 applies a vacuum pressure to the valve working chamber 25 and an opening force to the main valve 24 when the level of the sewage in the sewage tank 1 rises, and opens the vacuum valve 2 to open the sewage suction pipe 1A. Then, the vacuum sewer pipe 5 is electrically connected.

Therefore, the controller 27 of the vacuum valve 2 is constructed as follows. As shown in FIGS. 3 and 4, the control unit 27 is configured by integrating first to fifth cylindrical cases 51 to 55 with through bolts. Normally, the fourth case 54 is integrated with the second housing 22 of the vacuum valve 15 by the band clamp 36.

The control unit 27 has a liquid level detection pipe connection port 56 to which a liquid level detection pipe 37 communicating with the dirty water tank 1 is connected via a hose 38. The liquid 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.

The control section 27 also has a vacuum pressure connection port 57 in the third case 53 to which the vacuum sewer pipe 5 is connected via the hose 41.

The control section 27 also has an atmospheric pressure connection port 58, which is connected to the atmosphere communication pipe 8 via the hose 44, in the third case 53.

The atmosphere communication pipe 8 is connected via a hose 46,
The valve working chamber 25 is communicated with the lower chamber than the plunger 30 (see FIG. 2). At this time, the chamber below the plunger 30 of the valve operating chamber 25 is formed by the lower chamber housing 47 that is sandwiched between the first and second housings 21 and 22 of the vacuum valve 2. Check valve 4
8 is provided, and a check valve cover 49 is joined around the valve rod 29 penetrating portion of the lower chamber housing 47.

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. It is provided.

The detection valve 68 is disposed 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 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, and the atmosphere gradually enters through the needle valve 74.

The vacuum valve controller 27 operates as follows. When the liquid level in the wastewater masu 1 rises, the liquid level detection pipe 37,
Since the air pressure in the hose 38 and the liquid level detecting diaphragm upper chamber 81 rises and the liquid level detecting diaphragm lower chamber 82 communicates with the atmosphere, the liquid level detecting diaphragm 60 having a pressure difference 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 to be displaced downward, and the detection valve 68 provided in the upper chamber 83 of the third case 53 is pushed downward to be opened.

By operating the detection valve 68, the third case chamber 8
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 dirty water in the tank is discharged to the vacuum sewer pipe 5.

When the liquid in the tank is discharged, the liquid level is lowered, the pressure of the liquid level detecting diaphragm 60 is lowered, and it is pushed back by the spring 66 provided on the plunger 65. Close to the initial state.

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.

Therefore, in this embodiment, the vacuum valve 2 is
As shown in FIG. 5, the main valve 2 fixed to the tip of the valve rod 29
4 is provided with a seal rubber 91 immediately below the seal rubber 91.
Is fixed by a seal retainer 92 and a nut 93. A cutter blade 94 is provided along the outer circumference of the tip seal retainer 92 of the main valve 24, and a cutter blade 95 is provided along the inner circumference of the valve seat 20 below the seal portion. The cutter blades 94 and 95 of this embodiment constitute a press cutter and are made of a hard material such as steel or ceramics. In addition, the cutter blades 94 and 95 may constitute a shearing cutter.

The operation of this embodiment will be described below. The contaminants mixed in the fluid passing through the vacuum valve 2 are the cutter blade 9 provided in the fluid passage portion 28.
As a result of being cut by 4, 95, even when the vacuum valve 2 is closed, it is not caught by the main valve 24 and the valve seat 20 due to entanglement or the like, and smoothly flows down to the downstream side of the valve. As a result, the vacuum valve 2 can be completely closed and kept airtight, the vacuum pressure of the entire system is ensured, and the function of the vacuum sewer is maintained.

Since the cutter blades 94 and 95 are provided at the tip portion of the main valve 24 and the downstream portion of the valve seat 20, when the vacuum valve 2 is closed, the contaminants adhered to the seal portions of the main valve 24 and the valve seat 20. The object is automatically cut and removed by the cutter blades 94 and 95, and the airtightness of the seal portion is maintained.
The cut foreign matter is flowed down to the valve downstream side by the time the vacuum valve 2 is fully closed, or is flowed down to the valve downstream side together with the fluid (dirt water) that passes when the next valve is opened.

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 are possible. Even if it exists, it is included in the present invention. For example, the cutter means of the present invention is not necessarily provided on both the valve body and the valve seat, but is provided on either one of the valve body and the valve seat, or a fluid passage portion other than the valve body and the valve seat. Is also good. The vacuum valve of the present invention can also be applied to a sewage collection system for livestock.

[0035]

As described above, according to the present invention, even if contaminants are mixed in the fluid passing through the vacuum valve, these contaminants are prevented from being caught between the valve body and the valve seat. can do.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a wastewater tank to which a first embodiment of the present invention is applied.

FIG. 2 is a schematic diagram showing a vacuum valve.

FIG. 3 is a cross-sectional view showing a control unit of a vacuum valve.

FIG. 4 is another cross-sectional view showing a control unit of the vacuum valve.

FIG. 5 is an enlarged view of a main part of a vacuum valve.

FIG. 6 is a schematic diagram showing a vacuum sewer system.

[Explanation of symbols]

 2 vacuum valve 20 valve seat 21, 22 housing 24 main valve (valve body) 25 valve working chamber 26 closing force applying spring (pressing means) 94, 95 cutter blade (cutter means)

Claims (2)

[Claims] 1. A housing having a fluid passage portion and a valve seat; and a housing provided in the housing for contacting and separating from the valve seat.
It has a valve body that opens and closes the fluid passage portion, a pressing means that presses the valve body against the valve seat, and a valve working chamber in which a vacuum pressure acts to separate the valve body from the valve seat against the pressing means. A vacuum valve with a foreign matter cutting mechanism, characterized in that a cutter means for cutting foreign matter is provided in a fluid passage portion of the housing. 2. The vacuum valve with a foreign matter cutting mechanism according to claim 1, wherein the cutter means is configured by providing a cutter blade at a tip portion of the valve body and a downstream portion of the valve seat.