JP2574083Y2 - Pressure relief valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure relief valve, and more particularly, to a pressure in a gate chamber pit when a gate is closed in a sewer system, for example, a pump station, a gate chamber provided at an entrance of a sand basin. To a pressure relief valve for releasing pressure.

[0002]

2. Description of the Related Art For example, as shown in FIG. 4, a gate chamber 3 having a gate 2 is provided in front of a sand basin chamber 1 of a sewer system.
Is provided. The gate 2 is provided to prevent a large amount of sewage from flowing into the sand basin room 1 due to an increase in water due to a typhoon, heavy rain, or the like. The gate 2 is closed when such water is increased. . At this time, when the water level in the gate chamber 3 on the front surface of the gate 2 rises, the pressure in the gate chamber 3 rises, so it is necessary to release the air in the gate chamber pit 3a. Further, when the water level in the gate chamber 3 drops when the gate 2 is closed and the pressure drops, it is necessary to introduce air into the gate chamber pit 3a.

For this reason, conventionally, in the upper part of the gate chamber 3,
The pressure relief device 4 as shown in FIG. 5 was provided. The pressure relief device 4 includes a U-shaped pipe 5, water 6 in the U-shaped pipe 5,
The water 6 is constituted by an injection port 7 for injecting the water 6, and usually, the water 6 closes the inside of the U-shaped pipe 5 and the pit 3 a
Prevents sewage odor inside from leaking out. When the gate 2 is closed and the pressure in the pit 3a rises or falls, the water 6
The inside of the U-shaped tube 5 is moved and the inside of the U-shaped tube 5 is opened to suck and discharge air.

[0004]

However, in the conventional pressure relief device 4, it is necessary to always maintain the amount of water 6 in the U-shaped tube 5 within a predetermined range.
Since the water 6 runs out every time the air in the a is sucked and exhausted, the water 6
Management was troublesome. Further, in order to suck and discharge air in the pit 3a, a pressure difference enough to move the water 6 was necessary.

Accordingly, an object of the present invention is to provide a pressure relief valve which operates reliably even with a small differential pressure and requires little maintenance work.

[0006]

In order to achieve the above-mentioned object, the pressure release valve of the present invention is provided by a hinge provided above a substantially vertical opening for communicating the inside of the pit with the outside air.
A main door that closes the opening by its own weight is vertically installed so as to be openable and closable, and a small opening is provided in the main door to allow communication between the inside of the pit and the outside air. The child door that closes the small opening by its own weight is vertically installed so as to open in a direction opposite to the opening direction of the main door.

[0007]

According to the above configuration, for example, when the pressure in the pit increases, the parent door opens to perform exhaust, and when the pressure in the pit decreases, the child door opens to perform intake. Both doors are suspended by a hinge at the top of the door and are formed so as to close each opening by their own weight, so that they can be opened and sucked and exhausted with a slight pressure difference. Also, since there are few moving parts and no driving mechanism, almost no maintenance work is required.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional side view showing an embodiment of the pressure release valve of the present invention, FIG. 2 is a sectional front view thereof, and FIG. 3 is a sectional side view of a main part. A main door 21 and a child door 31 serving as an open / close valve are provided in the pit 3a of the gate chamber 3 shown in FIG.
It communicates with the inside.

The valve box 12 is provided at the top of the pit via support legs 14, and has a substantially square opening 15 to which the pipe 13 is connected on one side, and a bottom portion communicating with the outside air. A suction / exhaust port 16 is formed.
Is mounted via a flange 17 mounted on the outer periphery of the outer surface of the opening 15.

The main door 21 is connected to the opening 1 inside the valve box.
5, and is suspended by two hinges 22 provided above the opening 5.
A gasket 23 for airtightly closing the gasket is provided. The position of the hinge 22 is set so that the opening 15 can be closed from the inside of the valve box with the main door 21 hanging substantially vertically from the hinge 22, and the hinge 22 is provided via an appropriate angle 24 or spacer 25. It is mounted in the valve box 12.

The child door 31 opens and closes a small opening 26 formed substantially at the center of the main door 21 in a direction opposite to the opening and closing direction of the main door 21 from outside the valve box 12. Opening 2
6 and is suspended by two hinges 32 provided on the outer surface of the main door above the small opening 26. A gasket 33 for hermetically closing the small opening 26 is also provided on the outer peripheral portion of the child door 31 similarly to the parent door 21.
1 is attached to the outer surface of the main door 21 via a suitable angle 34 and a spacer 35 at a position where the small opening 26 is closed when the device 1 hangs substantially vertically from the hinge 32.

Normally, the pressure release valve 11 configured as described above has the opening 1 with the parent door 21 and the child door 31 vertically hanging down from the hinges 22 and 32 under their own weights.
5 and 26 are closed to prevent sewage odor from flowing out from the pressure release valve 11 to the outside. At this time,
Since the intake / exhaust port 16 of the valve box 12 is opened downward,
It is hardly affected by the wind, and the main door 21
The child door 31 can be prevented from opening.

When the gate 2 is closed and the pressure in the pit of the gate chamber rises, the main door 2 is closed due to the pressure difference.
1 opens to exhaust the air in the pit, and when the pressure in the pit decreases, the child door 31 opens to suck the air into the pit. At this time, since both doors are only hanging down by their own weight, the opening operation can be performed even with a slight pressure difference, and the air in the pit can be reliably sucked and exhausted.

The main door 21 constituting the pressure release valve 11
Since the opening and closing operation of the child door 31 does not use a biasing means such as a spring or a driving mechanism, and is formed so as to open and close by the own weight of the parent door 21 and the child door 31 and the pressure difference between the inside and outside,
It is possible to maintain a stable operating state for a long time with little maintenance work.

The opening direction of the parent door and the child door can be set in the opposite direction to the above embodiment, and the shape of the opening and the like can be set arbitrarily.

[0016]

As described above, the pressure release valve of the present invention is provided with a main door for closing the opening by its own weight at the opening for communicating the inside of the pit with the outside air, and at the main door. In the small opening, the small opening is closed by its own weight, and a child door that opens in a direction opposite to the main door is provided so as to be openable and closable. Either can open and air can be sucked and exhausted automatically. At this time, both doors close each opening in a state of hanging down in the vertical direction by their own weight, so they operate reliably even with a slight pressure difference and do not have a drive mechanism, so almost no maintenance work is required And not.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing one embodiment of a pressure release valve of the present invention.

FIG. 2 is a sectional front view of the same.

FIG. 3 is a cross-sectional side view of a main part in the same manner.

FIG. 4 is a sectional view showing an example of a gate room portion of the sewerage facility.

FIG. 5 is a sectional view showing an example of a conventional pressure relief device.

[Explanation of symbols]

11 ... pressure release valve, 12 ... valve box, 14 ... support leg, 15 ...
Opening, 16 ... intake / exhaust port, 21 ... parent door, 22, 32 ... hinge, 23, 33 ... gasket, 26 ... small opening, 31
… Child door

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve for releasing pressure in a gate chamber pit provided in a sewer system, wherein the valve is opened by a hinge provided above a substantially vertical surface opening for communicating the inside of the pit with outside air. The main door that closes the part by its own weight is vertically installed so as to be openable and closable, and the main door is provided with a small opening that allows communication between the inside of the pit and the outside air, and the small opening is provided by a hinge provided above the small opening. A pressure release valve, wherein a child door for closing a part by its own weight is vertically installed so as to open in a direction opposite to an opening direction of the main door.