JPH0110483Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a pressure vessel used in a water supply system, and particularly relates to an automatic air supply system to an air-filled space of a pressure vessel.

``Prior Art'' A conventional pressure vessel for a water supply system includes a rigid vessel having an opening, and an opening that is placed in the rigid vessel and overlaps and is located at the same position as the opening of the rigid vessel made of an elastic body. The pressure vessel is comprised of a bag body having a section, an air-filled space is formed between the rigid container and the bag body, and water flows in and out of the bag body.

``Problem that the invention seeks to solve'' The rigid vessel of this pressure vessel is generally manufactured by welding steel plates, etc., and is provided with removable covers for manhole inspection ports, cleaning ports, etc. for legal and practical reasons. .

Air in the air-enclosed space may leak from these welded portions and various lid connection portions. Furthermore, the amount of leakage is so small that it cannot be measured during inspection during manufacturing, and it continues to leak over a long period of time. Therefore, if the sealed air leaks, water will flow into the bag until it reaches a constant pressure, so the amount of water flowing will increase, and if the bag swells too much, it will stretch out and eventually break. Put it away. Further, even if the bag is not damaged, if the bag gradually becomes filled with water exceeding a predetermined amount, the original pressurized water supply function will be reduced.

SUMMARY OF THE INVENTION In order to eliminate such drawbacks, the object of the present invention is to provide a pressure vessel equipped with a device that can automatically replenish the leakage of air sealed in the pressure vessel.

"Means for Solving the Problems" The present invention includes a rigid container having an opening, and an opening that overlaps and is located at the same position as the opening of the rigid container installed in the rigid container and made of an elastic material. A pressure vessel comprising a bag body, forming an air-filled space between the rigid container and the bag body, and providing an inflow/outflow pipe in the opening at the same position, for allowing water to flow in and out of the bag body, The lower side of the diaphragm of a diaphragm air pump, which uses the inflow and outflow pressure of water as a power source, is connected to the inflow and outflow piping, and a check valve and a relief valve are connected in series in this order to the upper side of the diaphragm of the diaphragm air pump. A branch pipe is connected to the pipe between the diaphragm air pump and the check valve, a check valve is provided in the branch pipe, and the relief valve is attached to the side wall of the rigid container, and the relief valve is attached to the side wall of the rigid container. This pressure vessel is characterized by having a valve device connected to the piping that opens when the bag comes into contact with the bag and closes when the bag leaves.

"Operation" The pressure vessel according to the present invention opens only when the bag body comes to the rigid container mounting position of the valve device, and air is replenished only when the air-filled space at this time is leaking and the pressure is lower than the appropriate pressure. No space pressure drop occurs.

"Embodiment" FIGS. 1 and 2 show an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a rigid container with an airtight structure, which is usually manufactured by welding steel plates or the like. 8 is a rigid container 1
This is a manhole nozzle attached to the top of the manhole, and the rigid container 1 is covered by a manhole closing flange 9. Reference numeral 4 denotes an opening provided at the lower part of the rigid container 1, to which an inflow/outflow pipe 5 for connection with external piping parts is attached. 7 is a support member for the rigid container 1. Reference numeral 2 denotes a deformable bag body made of a flexible elastic material such as rubber or soft synthetic resin, and has an opening 2a at the bottom, and this bag opening 2a is placed over the rigid container opening 4 and placed at the same position. This allows water to flow in and out. Further, the upper part of the bag body 2 is suspended from a bag body attachment fitting 10 attached to a manhole closing flange 9.

Note that between the bag body 2 and the rigid container 1 is an air-filled space 3 in which air is sealed under pressure. Reference numeral 6 denotes a cylinder made of a porous metal plate for preventing the bag 2 from being pushed out from the bag opening 2a. 11
is a pressure outlet attached to the inflow/outflow pipe 5, and is connected to the lower side of the diaphragm of the diaphragm air pump 12 by a pipe 17. A check valve 13a and a receiver tank 14 are connected to each other by piping in series in this order above the diaphragm of the diaphragm air pump. The check valve 13a allows air to flow from the diaphragm air pump 12 to the receiver tank 14. Further, a branch pipe is provided in the piping between the check valve 13a and the diaphragm air pump 12, and the diaphragm air pump 1 is connected to the branch pipe.
A check valve 13b is provided that allows flow to the second side. A relief valve 15 is attached to the receiver tank 14 to maintain the internal pressure below a certain pressure. This relief valve 15 may be provided in the piping 18. The receiver tank 14 is also connected to a valve device 16 attached to the rigid container 1.

Next, the valve device 16 is installed based on FIG. A mounting flange 18 is attached to the rigid container 1, and a presser ring 19 is assembled to the mounting flange 18.
A valve body 21 is located inside the mounting flange 18, and a valve body head 20 at the tip thereof projects into the rigid container 1. A seat packing 22 is attached to the valve body 21, and a seat surface 23 is formed on the mounting flange 18. A seat gasket 23 is always pressed against this seat surface 22 by a spring 24, thereby maintaining a leak-preventing function. Also, the guide shaft 27 of the valve body 21
is inserted into the guide hole 25 of the presser ring 19 so that it can slide. The presser ring 19 has a through hole connection port 26.
has.

When the valve head 20 of this valve device 16 is pressed against the wall side of the rigid container 1 by the bag body 2, the connection port 26 of the valve device 16 and the air-filled space 3 communicate with each other.

Next, the situation in which air is automatically replenished into the air-filled space 3 in the automatic air replenishment device described above will be described. When water flows into the bag body 2 through the inflow/outflow pipe 5, it also flows into the diaphragm air pump 12 through the pressure outlet 11. Then, air is discharged from the upper side of the diaphragm of the diaphragm air pump 12, and air is sucked into the upper side of the diaphragm. At this time, compressed air is injected into the receiver tank 14 by the action of the check valve 13a and the check valve 13b. The set pressure of the relief valve 15 is made equal to the appropriate pressure in the air-filled space 3 when the bag body 2 comes to the position A, and excess pressure is released. When water enters the bag body 2 and rises to the position A, the bag body 2 contacts the valve body head 20, the push-in seat packing 22 and the seat surface 23 open, and the receiver tank 14 and the air-filled space 3 communicate with each other. If the air-filled space 3 does not leak, it remains as is, but if there is a leak and the pressure in the air-filled space 3 is lower than the pressure in the receiver tank 14, air is supplied from the receiver tank 14.

Furthermore, by changing the set pressure of the relief valve 15, the valve device 16 can be installed at any position in the height direction of the rigid container 1, but preferably at the highest position where the bag body 2 is located at an appropriate time without leaking into the air-filled space 3. This area is desirable below. This is because if the mounting position of the valve device 16 is low, the set pressure of the relief valve 15 will also be low, and when the bag body 2 comes to a high position, the pressure in the air-filled space will be high, and there will be a reverse relationship between the relief valve 15 and the valve device 16. This is because air will escape if there is no stop valve. Furthermore, the movement of the portion of the bag body 2 in contact with the inner wall surface of the rigid container 1 varies in the height direction. Therefore, if a plurality of valve devices 16 are installed at the same height and all are connected to the receiver tank 14 by piping, even more stable functionality can be achieved.

Furthermore, the air pressure in the receiver tank 14 can be replenished even if the gas-filled space 3 is directly connected to the receiver tank 14 equipped with the relief valve 15 without using the valve device 16 of this embodiment. is desirable. This is because it is difficult to determine the set pressure of the relief valve 15. That is, when the set pressure is set high, air is gradually supplied to the air-filled space 3 even if there is no leakage, so the amount of water flowing into the bag body 2 is reduced, and when set pressure is set low, air leaks from the relief valve 15.

``Effect of the invention'' As established above, the inflow pressure of water is used, and the filling pressure is automatically replenished or checked by the operation of the air pump. This has the excellent effect of preventing damage or deterioration of function, and allowing the pressure vessel to operate stably over and over again.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the invention, and FIG. 2 is a detailed view of a portion of FIG. 1. DESCRIPTION OF SYMBOLS 1... Rigid container, 2... Bag body, 3... Air enclosure space, 12... Diaphragm air pump, 13
a, 13b...Check valve, 14...Receiver tank, 15...Relief valve, 16...Valve device.

Claims (1)

[Scope of utility model registration request] consisting of a rigid container having an opening, and a bag body installed in the rigid container and having an opening overlapping and at the same position as the opening of the rigid container made of an elastic body, the rigid container and the bag body In a pressure vessel in which an air-filled space is formed between the bag and an air-filled space is provided in the opening at the same position, and water flows in and out of the bag body, the inflow and outflow pressure of water is applied to the outflow and inflow piping as a power source. The lower side of the diaphragm of the diaphragm air pump is connected with piping, and the upper side of the diaphragm of the diaphragm air pump is connected with piping in series with a check valve and a relief valve in this order. A branch pipe is installed in the pipe between the valve and the branch pipe is provided with a check valve, and the relief valve is attached to the side wall of the rigid container, and when the bag comes into contact with this attachment position, it opens and when it leaves, it closes. A pressure vessel characterized by having a valve device connected to the piping.