JPH06346975A - Vacuum valve - Google Patents

Abstract

PURPOSE:To restrain the abrasion of a rolling diaphragm provided in the valve operating chamber of a vacuum valve to be driven by vacuum. CONSTITUTION:A plunger 30 is slidably arranged in a first housing 21 and a second housing 22, and a valve operating chamber 25 to be made in the vacuum state so that this plunger 30 may slide is provided in the housings 21, 22. The valve operating chamber 25 is isolated in airtight state in the housings 21, 22 by the rolling diaphragm 31 arranged between the outer peripheral surface of the plunger 30 and the inner peripheral surface of the second housing 22. Lubricant is mixed by kneading in the rolling diaphragm 31, and the lubricant always seeps out on the front surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vacuum type waste water collecting device,
The present invention relates to a vacuum valve which is mounted on a vacuum type chemical liquid transportation device or the like and whose valve body is driven by vacuum.

[0002]

2. Description of the Related Art Sewage discharged from homes or the like is usually delivered to a sewage treatment plant by gravity flow. However, in such a natural flow-down type sewage collection system, there is a problem that the laying of the sewer pipe is restricted by the topography and the state of the ground, and the inside of the pipe is easily clogged. For this reason, recently, a vacuum type sewage collection system has been attracting attention, in which sewage discharged from each home is forcibly conveyed by using a vacuum pressure.

In such a vacuum type sewage collection system, a sewage discharged from each home is stored in a vacuum valve unit by natural flow, and a vacuum station for collecting sewage from the vacuum valve unit through a vacuum pipe. It is composed by.

The vacuum valve unit is disclosed in, for example, Japanese Patent Publication No.
It is disclosed in Japanese Patent No. 503128. The vacuum valve unit disclosed in this publication has a suction pipe, one end of which is immersed in dirty water in a waste water tank, and a vacuum valve in which a tubular connecting portion is connected to the other end of the suction pipe, further,
A vacuum exhaust pipe connected to the connecting portion, and the vacuum exhaust pipe is connected to a vacuum pump arranged at the vacuum station via a vacuum pipe. The vacuum valve is adapted to open and close the connecting portion by operating a valve body arranged in the tubular connecting portion. The vacuum exhaust pipe is
A vacuum pump connected via a vacuum pipe always keeps a vacuum state. When a predetermined amount of sewage is stored in the sewage tank, the valve element of the vacuum valve is opened by the pressure difference between the vacuum pressure inside the vacuum discharge pipe and the atmosphere, and the tubular connecting portion is opened. . As a result, the vacuum discharge pipe and the suction pipe in a vacuum state are brought into communication with each other, and the dirty water in the dirty water tank is sucked into the vacuum discharge pipe by the vacuum pressure and conveyed to the vacuum station through the vacuum pipe.

The valve body arranged in the connecting portion of the vacuum valve normally closes this connecting portion, and when the valve working chamber is evacuated, the valve body is pulled and the connecting portion is opened. To do. The vacuum state in the valve operating chamber is controlled by the vacuum valve control device.

The vacuum valve control device is connected to a liquid level detection pipe whose lower end is immersed in the wastewater in the wastewater tank, and the pressure fluctuation in the liquid level detection pipe due to the elevation of the level of the wastewater causes The liquid level detection diaphragm disposed inside the vacuum valve control device elastically deforms. Due to the deformation of the liquid level detection diaphragm, the detection valve that introduces a vacuum into the vacuum valve control device operates to apply the vacuum to the switching valve arranged inside the vacuum valve control device. As a result, the switching valve is switched, the inside of the vacuum discharge pipe and the valve operating chamber of the vacuum valve are brought into communication with each other, and the inside of the valve operating chamber becomes a vacuum state. Then, the valve body is pulled by the vacuum state in the valve operating chamber, and the connecting portion is opened.

As a result, the vacuum discharge pipe and the suction pipe, which are in a vacuum state, are brought into communication with each other, and the inside of the suction pipe is also in a vacuum state, so that the dirty water in the waste water tank quickly enters the suction pipe and the vacuum discharge pipe. It is sucked and conveyed through the vacuum piping to the water collection tank of the vacuum station.

When the sewage in the sewage tank is instantly sucked by the vacuum, the liquid level detection diaphragm of the vacuum valve control device gradually returns to its original state. As a result, the operation of the detection valve is released, the communication between the inside of the vacuum valve control device and the vacuum exhaust pipe is cut off, and the atmosphere is introduced into the vacuum valve control device. Then, the switching valve is switched, and the atmosphere is introduced into the valve working chamber of the vacuum valve.

[0009]

A rolling diaphragm is provided between the outer peripheral surface of the plunger arranged in the housing of the vacuum valve and the inner peripheral surface of the housing to isolate the valve working chamber in the housing in an airtight state. Are arranged.
The rolling diaphragm is made of elastic rubber or the like, and the outer peripheral surface of the plunger and the inner peripheral surface of the housing are arranged so as to be in close contact with the outer peripheral surface of the plunger and the inner peripheral surface of the housing. It is bent between. Then, when the plunger slides due to the vacuum acting in the valve operating chamber in the housing, the rolling diaphragm is deformed so that the bent portion moves along the sliding direction of the plunger. In this way, the rolling diaphragm does not change the volume in the valve working chamber,
Therefore, the vacuum reliably slides the plunger.

The vicinity of the bent portion of the rolling diaphragm is normally not in close contact with the inner peripheral surface of the housing but is in a state of being crimped to the rolling diaphragm in close contact with the outer peripheral surface of the plunger. When the rolling diaphragms are pressure-bonded to each other in this manner, when the pressure-bonded portions move as the plunger slides, they may rub against each other and wear. When the rolling diaphragm is worn, the airtightness of the rolling diaphragm itself may be impaired. When the airtightness of the rolling diaphragm is impaired, the airtightness in the valve working chamber is not maintained, and the plunger is not driven due to the vacuum in the valve working chamber.

To this end, on the surface of the rolling diaphragm,
A method of suppressing wear of the rolling diaphragm by applying a lubricant such as silicon grease or silicon oil has been implemented. However, since the applied lubricant permeates into the rolling diaphragm made of an elastic body, the effect of the lubricant is not exerted for a long period of time, and the rolling diaphragm must be replaced in a short period of time.

Further, a valve rod is connected to the plunger arranged in the housing, and the valve rod is inserted through a through hole provided in the housing. The valve element is attached to the tip of the valve rod located outside the housing. A shaft seal is pressed against the valve rod so that it can slide in an airtight state with respect to the through hole of the housing. Since this shaft seal is also made of an elastic material such as rubber, it may wear due to sliding contact with the valve rod, and the airtightness may be impaired over time.

To this end, a lubricant is applied to the surface of the shaft seal as in the rolling diaphragm described above. The applied lubricant permeates into the shaft seal which is an elastic body. Therefore, the shaft seal may not function in a short period of time. Further, since the shaft seal comes into contact with the dirty water flowing in the communication part, the lubricant applied to the surface of the shaft seal is washed away by the dirty water, so that the effect of the lubricant is rolling. It may only last for a shorter period of time than a diaphragm.

The present invention solves such a problem, and an object thereof is to provide a vacuum valve capable of stably using a rolling diaphragm for airtightly isolating a valve working chamber for a long period of time. It is in.

Another object of the present invention is to provide a vacuum valve capable of stably using a shaft seal which is pressed against a valve rod and seals between the valve rod and a housing in an airtight state over a long period of time. Especially.

[0016]

SUMMARY OF THE INVENTION A vacuum valve according to the present invention comprises a housing having a valve operating chamber in which a vacuum acts, a plunger slidably disposed in the housing, and a valve operating in the housing. A rolling diaphragm that is arranged between the outer peripheral surface of the plunger and the inner peripheral surface of the housing so as to isolate the chamber in an airtight state, and has a resilient diaphragm that deforms as the plunger moves. The rolling diaphragm is characterized in that the lubricant is contained therein so that the lubricant oozes out on the surface, and thereby the above object is achieved.

In the vacuum valve of the present invention, a housing having a valve working chamber in which a vacuum acts therein, a plunger slidably disposed in the housing, and one end of the plunger are connected to the plunger. And the other end portion penetrates the housing so that the other end portion is located outside the housing, and a valve rod provided with a valve element at the end portion outside the housing, and between the housing and the valve rod. An elastic shaft seal pressed against the valve rod so as to seal in an airtight state, and the shaft seal contains a lubricant so that the lubricant oozes to the surface. The above-mentioned object is achieved thereby.

[0018]

In the vacuum valve of the present invention, since the rolling diaphragm that isolates the valve working chamber to be evacuated in the housing contains the lubricant, the lubricant is sequentially exuded on the surface.
The lubricant exuding on the surface of the rolling diaphragm is deformed by the movement of the plunger moving in the valve operating chamber and suppresses the wear of the rolling diaphragm when the vicinity of the bent portion rubs.

Further, in the vacuum valve of the present invention, since the shaft seal pressed against the valve rod inserted through the through hole of the housing by the movement of the plunger contains the lubricant, the lubricant is sequentially applied to the surface. It exudes. The lubricant exuding on the surface of the shaft seal suppresses wear of the shaft seal when sliding on the valve rod.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of a vacuum type waste water collecting apparatus using the vacuum valve of the present invention. The vacuum-type sewage collector 10 is provided to collect sewage discharged from each home by natural flow. The vacuum-type sewage collector 10 has a predetermined amount of sewage collected in the sewage tank 11. As a result, the sewage is vacuum-fed to a water collection tank of a vacuum station provided with a vacuum pump or the like. The sewage sent to the water collection tank is sent to the sewage treatment plant from the water collection tank by a pressure pump.

In this vacuum type sewage collection apparatus 10, a sewage inflow pipe 12 into which sewage from each household or the like flows in is naturally connected to a sewage tank 11. Inside the sewage tank 11, a suction pipe 13 for sucking the sewage stored in the sewage tank 11 is arranged in a vertical state, and the valve body 24 of the vacuum valve 15 is provided at the upper end of the suction pipe 13. One end of the tubular connecting portion 28 inside is connected in a horizontal state. At the other end of this connecting portion 28,
The vacuum discharge pipe 14 is connected in a horizontal state. Contact section 2
8 is opened and closed by a valve body 24 of a vacuum valve 15 arranged inside.

The vacuum discharge pipe 14 is connected to the vacuum station by a vacuum pipe, and the insides of the vacuum discharge pipe and the vacuum pipe are constantly kept in a vacuum state by a vacuum pump arranged in this vacuum station. Therefore, when the connecting portion 28 is opened, the vacuum exhaust pipe 14
The inside and the suction pipe 13 are in communication with each other, and the sewage tank 1
The dirty water in 1 is sucked into the suction pipe 13 and is quickly transported to the water collecting tank of the vacuum station by the vacuum pressure in the connecting portion 28 and the vacuum discharge pipe 14.

In the sewage tank 11, a liquid level detecting pipe 3 having a lower end portion immersed in the sewage stored in the sewage tank 11
7 are arranged vertically. This liquid level detection tube 37
Is connected to the inside of a vacuum valve control device 27 provided in the vacuum valve 15 by a flexible hose 38, and a pressure change based on the fluctuation of the liquid level in the dirty water tank 11 is transmitted to the vacuum valve control device 27. It is supposed to be done. The vacuum valve control device 27 controls the vacuum pressure of the vacuum valve 15 with respect to the valve working chamber 25 based on the liquid level fluctuation of the dirty water in the dirty water tank 11 detected by the liquid level detection pipe 37.

The inside of the vacuum discharge pipe 14 is connected to the vacuum valve control device 27 by a flexible hose 41, and the vacuum state inside the vacuum discharge pipe 14 is controlled by the vacuum valve control device 27.
Given to. Further, the vacuum valve control device 27 is connected to an atmosphere communication pipe 43 via a flexible hose 44. The atmosphere communication pipe 43 has an upper end opened to the atmospheric pressure on the surface of the earth, and the atmosphere introduced from the atmosphere communication pipe 43 is introduced into the vacuum valve control device 27 through the flexible hose 44. To be done. This atmosphere communication pipe 4
3 is a vacuum valve 1 by a flexible hose 46.
5 also communicates with the valve working chamber 25.

FIG. 2 is a vertical sectional view of the vacuum valve 15. The vacuum valve 15 has a cylindrical first housing 21 that is integrally formed with a communication portion 28 in which the valve body 24 is arranged and communicates with the inside of the communication portion 28, and the first housing 21.
And a second housing 22 having the same cylindrical shape and connected by a band clamp 23 on the upper side of the. First
The housing 21 is tilted by approximately 45 degrees with respect to the horizontal connecting portion 28. The inside of the first housing 21 is divided into upper and lower parts by a partition wall portion 21a, and the valve working chamber 25 is located above the partition wall portion 21a. A valve rod 29 penetrates through the center of the partition wall 21a, and a valve body 24 for opening and closing the connecting portion 28 is attached to the lower end of the valve rod 29.

A shaft seal 32 is provided around the through hole of the partition wall 21a through which the valve rod 29 penetrates so as to slidably and press-contact with the outer peripheral surface of the valve rod 29 in an airtight state. This shaft seal 32 is made of silicone oil, silicone grease, DPO.
A rubber in which a lubricant such as (2,5-diphenyloxazole) is kneaded during molding is used, and the lubricant kneaded inside is gradually exuded to the surface. Therefore, the surface of the shaft seal 32 is always in a state where the lubricant has exuded.

The upper end portion of the valve rod 29 arranged in the valve working chamber 25 is attached to the bottom surface of a cylindrical plunger 30 having an open top surface. This plunger 30
The valve body 24 is slidably arranged in the valve working chamber 25, and is pushed by a pushing spring 26 arranged in the valve working chamber 25.
The plunger 30 is biased so that the contact portion 28 closes.

First housing 21 and second housing 22
A rolling diaphragm 31 having elasticity is provided between and. The rolling diaphragm 31 is fixed such that the outer peripheral edge portion is sandwiched between the first housing 21 and the second housing 22. A portion near the outer peripheral edge portion is in a state of being in close contact with the inner peripheral surface of the second housing 22, and a center side portion close to the inside of the portion in close contact with the inner peripheral surface of the second housing 22 is It is bent over 360 degrees. A portion close to the inside of the bent portion is in close contact with the outer peripheral surface of the plunger 30, and a central portion inside the portion is in close contact with the bottom surface of the plunger 30. The valve rod 29 penetrates the center of the rolling diaphragm 31 that covers the bottom surface of the plunger 30.

The rolling diaphragm 31 airtightly isolates the valve working chamber 25 in the first housing 21 and the second housing 22. The valve working chamber 25, which is an upper portion of the rolling diaphragm 31 in the valve working chamber 25,
When the vacuum is generated, the vacuum causes the plunger 30
Is moved upwards. At this time, with the movement of the plunger 30, the contact state of the rolling diaphragm 31 with respect to the outer peripheral surface of the plunger 30 is sequentially peeled off from the upper side, and the rolling diaphragm 31 is further closely contacted with the inner peripheral surface of the second housing 22 upward. To be in a state.

This rolling diaphragm 31, like the shaft seal 32 described above, is made of silicone oil, silicone grease,
A rubber in which a lubricant such as DPO is kneaded at the time of molding is used, and the lubricant kneaded inside is gradually exuded to the surface. Therefore, the surface of the rolling diaphragm 31 is always in a state where the lubricant has exuded.

A vacuum valve controller 27 is arranged in the upper end of the second housing 22. Details of the vacuum valve control device 27 are disclosed in the above-mentioned Japanese Patent Publication No. 2-503128. The vacuum valve control device 27 is fitted into the second housing 22 and is connected by the band clamp 36. A liquid level detection pipe 37 for detecting the liquid level of the sewage in the sewage tank 11 is connected to the vacuum valve control device 27 via a hose 38, and the amount of sewage in the sewage tank 11 increases to increase the amount of the liquid. When the position rises, the pressure inside the liquid level detection pipe 37 rises, and the pressure inside the vacuum valve control device 27 also rises. The vacuum valve control device 27 is in communication with the vacuum discharge pipe 14 via a hose 41, and when the pressure in the liquid level detection pipe 37 rises, the vacuum state inside the vacuum discharge pipe 14 is controlled by the vacuum valve control. Through the communication port 93 of the device 27, the valve working chamber 25
The valve working chamber 25 is brought into a vacuum state due to the vacuum state in the vacuum discharge pipe 14.

Further, the inside of the vacuum valve control device 27 communicates with the atmosphere communication pipe 43 via the hose 44, and when the pressure in the liquid level detection pipe 37 decreases, it is introduced from the atmosphere communication pipe 43. The atmospheric air is introduced into the valve working chamber 25 through the communication port 93. The atmosphere communication pipe 43 is connected via the hose 46 to the rolling diaphragm 3 in the vacuum valve 15.
1 is also in communication with the inside of the first housing 21 on the lower side, and when the valve working chamber 25, which is the upper side portion of the rolling diaphragm 31, is evacuated, the rolling diaphragm is removed from the atmosphere communication pipe 43. Atmosphere is introduced into the lower part of 31.

The operation of the vacuum valve 15 thus constructed is as follows. When the amount of sewage in the sewage tank 11 is gradually increased and the pressure in the liquid level detection pipe 37 whose lower end is immersed in the sewage rises, a vacuum valve communicating with the liquid level detection pipe 37 via a hose 38. The pressure inside the control device 27 rises, and the vacuum valve control device 27 is brought into communication with the vacuum discharge pipe 14 so that the inside becomes a vacuum state. Then, when the inside of the vacuum valve control device 27 is in a vacuum state, the vacuum valve 1
The inside of the valve working chamber 25 of No. 5 is brought into a vacuum state through the communication port 93.

As a result, the valve working chamber 25, which is the upper portion of the rolling diaphragm 31 of the vacuum valve 15, is placed in a vacuum state. At this time, the atmosphere is introduced into the lower portion of the rolling diaphragm 31, so that the plunger 30 slides upward against the biasing force of the push spring 26. As the plunger 30 slides upward, as shown by the chain double-dashed line in FIG. 2, in the rolling diaphragm 31, the bent portion is sequentially moved upward, and the portion that is in close contact with the outer peripheral surface of the plunger 30 is It is peeled off from the top and the second
The inner peripheral surface of the housing 22 is closely attached upward. In this manner, the valve working chamber 25 in the upper portion of the rolling diaphragm 30 is quickly brought into a vacuum state by maintaining the airtight state without changing the volume.

At this time, since the rolling diaphragm 31 whose bending portion changes with the movement of the plunger 30 is always in a state where the lubricant has exuded to the surface,
Even if the parts facing each other across the bent part are crimped,
Wear of the part is suppressed and the plunger 3
Wear due to contact with and separation from the outer peripheral surface of the second housing 22 and contact with and separation from the inner peripheral surface of the second housing 22 is also suppressed by the lubricant, and stable use can be achieved for a long time.

When the plunger 30 moves upward,
The valve rod 29 connected to the plunger 30 slides in an airtight state in pressure contact with the shaft seal 32, and the valve element 24 connected to the lower end of the valve rod 29 moves upward. As a result, the connecting portion 28 is opened, and the inside of the vacuum discharge pipe 14 is in a vacuum state, so that the suction pipe 13 is also depressurized through the connecting portion 28, and the dirty water is sucked into the suction pipe 13. To be done. The dirty water sucked into the suction pipe 13 is fed from the communication part 28 to the vacuum discharge pipe 14 and collected in the water collecting tank.

The shaft seal 32, which is pressed against the valve rod 29 in an airtight state, is always in a state in which the lubricant is leached on the surface, and therefore the shaft seal 32 is worn by sliding contact with the sliding valve rod 29. Is suppressed, and the periphery of the valve rod 29 can be stably maintained in an airtight state for a long period of time.

When the sewage in the sewage tank 11 is discharged in this way, the pressure in the liquid level detecting pipe 37 is lowered.
As a result, the pressure in the vacuum valve control device 27 decreases, and the atmosphere is introduced into the vacuum valve control device 27 through the air communication pipe 43 and the hose 44. The atmosphere introduced into the vacuum valve control device 27 is introduced into the valve working chamber 25 through the communication port 93, and the vacuum state in the valve working chamber 25 is released.
As a result, the plunger 30 of the vacuum valve 15 moves downward by the urging force of the push spring 26, and the valve rod 29 slides in a state where it is pressed against the shaft seal 32 in an airtight state, so that the valve body 24 communicates. The part 28 is closed.

At this time, the rolling diaphragm 31 is
The portion that is in close contact with the inner peripheral surface of the housing 22 is sequentially peeled off from the upper side, and the bent portion moves downward,
The outer peripheral surface is brought into a close contact state from the lower side to the upper side.

In this case as well, since the lubricant has exuded on the surfaces of the shaft seal 32 and the rolling diaphragm 31,
Wear of the respective surfaces is prevented.

[0042]

According to the vacuum valve of the present invention, the lubricant is constantly exuded on the surface of the rolling diaphragm that isolates the valve working chamber in the housing which is in a vacuum state. In addition, abrasion when the rolling diaphragm is deformed is suppressed, and the rolling diaphragm can be used stably for a long period of time. Further, in the vacuum valve of the present invention, since the lubricant is constantly exuded on the surface of the shaft seal that is pressed against the valve rod that is inserted through the housing in a hermetically sealed manner and slides, the wear of this shaft seal Is suppressed, and the shaft seal can be used stably for a long period of time. Therefore, according to the vacuum valve of the present invention, abrasion of the elastic bodies that rub against each other due to opening and closing thereof is suppressed, stable opening and closing operations can be performed for a long period of time, and maintenance can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vacuum sewage collection device showing a usage state of a vacuum valve of the present invention.

FIG. 2 is a vertical sectional view showing an example of the vacuum valve.

[Explanation of symbols]

 10 Vacuum Sewage Collection Device 11 Sewage Tank 13 Suction Pipe 14 Vacuum Evacuation Pipe 15 Vacuum Valve 21 First Housing 22 Second Housing 24 Valve Body 25 Valve Working Room 27 Vacuum Valve Control Device 28 Contact Part 30 Plunger 31 Rolling Diaphragm 32 Shaft sticker

Claims (2)

[Claims] 1. A housing having a valve working chamber in which a vacuum acts therein, a plunger slidably disposed in the housing, and a valve working chamber in the housing for airtightly isolating the valve working chamber. A rolling diaphragm that is arranged between the outer peripheral surface of the plunger and the inner peripheral surface of the housing and has elasticity that deforms with the movement of the plunger. A vacuum valve characterized by containing a lubricant so that it exudes to the inside. 2. A housing having a valve working chamber in which a vacuum acts therein, a plunger slidably disposed in the housing, and one end of the plunger connected to the other end of the plunger. So as to be located outside the housing, and a valve rod provided with a valve body at an end outside the housing, and an airtight seal between the housing and the valve rod. An elastic shaft seal pressed against the valve rod;
A vacuum valve, characterized in that the shaft seal contains a lubricant so that the lubricant leaks to the surface.