JP3040205B2 - Intake and exhaust device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction / exhaust device attached to a water pipe or the like of a pump.

[0002]

2. Description of the Related Art Conventionally, in water supply and sewage facilities, air in a water supply pipe is eliminated at an initial stage of water supply work, and the inside of the water supply pipe becomes large when an emergency stop of a pump is performed. In order to prevent negative pressure, it is necessary to suction (vacuum break), and a suction / exhaust device is installed in the water pipe. There are various types of intake and exhaust devices, and in general, an automatic air valve for both intake and exhaust having a built-in float is used. However, in the case of incorporating the float, if the water supply is sewage such as a sewer, the float is fixed to a valve seat in the apparatus due to oils and fats in the sewage, or dust or the like closes the valve seat, Intake / exhaust operation may not be performed sufficiently. In addition, if a large differential pressure is applied to the float at the time of air discharge, the float may come into pressure contact with the valve seat before exhaustion of the water supply pipe is completed, and exhaustion may not be possible. Therefore, an object of the present invention is to provide an air intake / exhaust device that operates without using the float and regardless of the quality of water supply.

[0003]

According to the present invention, in order to achieve the above object, in the first invention, an intake / exhaust device is provided in communication with an intake / exhaust port of a water pipe, and an auxiliary tank provided in the auxiliary tank is provided. An exhaust port provided at a lower portion, an exhaust valve attached to the exhaust port and forcibly opened during an exhaust process, and a check valve attached to an upper portion of the auxiliary tank and automatically opened during an intake process. is there. In the second invention, the high pressure gas source communicated with the first invention via an on-off valve to the upper part of the auxiliary tank, and the liquid level in the auxiliary tank is at a predetermined upper limit position above the exhaust port. First liquid level detecting means for detecting when the liquid level has reached and when the liquid level has dropped to a predetermined lower limit position, and when the first detecting means detects the upper limit position, opens the on-off valve. When the position is detected, the on-off valve is closed. Further, in the third invention, the liquid level in the auxiliary tank is substantially equal to the upper end of the exhaust port in the auxiliary tank. A second liquid level detecting means for detecting that the liquid level has reached the lower end position, and opening the exhaust valve when detecting that the liquid level has reached the lower end position from the upper end position; Is to be closed when it detects that

[0004]

Next, the present invention will be described with reference to examples. FIG. 1 shows a first invention, in which 1 is a water supply pipe installed on a floor 2 via a base plate 3, and water is supplied to an appropriate location by a water supply pump (not shown) as shown by an arrow in the figure. Is what is done. Reference numeral 4 denotes an intake / exhaust port provided at the top of the water supply pipe 1. The intake / exhaust port 4 is provided with an intake / exhaust device 5 according to the present invention.

The intake / exhaust device 5 generally comprises an auxiliary tank 6 provided above the intake / exhaust port 4, a check valve 8 and an exhaust valve 11. The check valve 8 is attached to the intake port 7 provided at the top of the auxiliary tank 6, and is a conventionally known valve that is automatically opened in the intake process described below to introduce air into the water pipe 1.

The exhaust valve 11 is provided in an exhaust pipe 10 communicating with a lower portion of the auxiliary tank 6 and is forcibly opened manually or by power in an exhaust process described below, so that air in the water pipe 1 is removed. Is to exhaust air. 9 is an exhaust port.

[0007] Because of the above configuration, the exhaust valve 11
Is opened and a water supply pump (not shown) is driven, a large amount of water is supplied from the water supply pump, and the air in the water supply pipe 1 is rapidly exhausted from the exhaust pipe 10, and a part of the water supply is eventually released. It flows out of the exhaust pipe 10. In this state, the exhaust valve 11 is closed. W is the liquid level in the auxiliary tank 6 after the exhaust valve 11 is closed. The exhaust valve 11
May be manually opened prior to water supply and closed when the water flows out of the exhaust pipe 10. However, since the open / close period of the exhaust valve 11 can be roughly predicted by the water supply equipment, The opening and closing of the valve 11 may be automatically performed by driving a motor (not shown) by a timer or the like. When the valve 11 is manually opened and closed, a communication pipe is provided in the auxiliary tank 6 to open and close the valve 11 visually. May be.

On the other hand, when the water supply pump performs an emergency stop and the pressure in the water supply pipe 1 and the auxiliary tank 6 becomes negative, the check valve 8 is automatically and instantly opened, and the air rapidly enters the water supply pipe 1. It is sucked and breaks the vacuum in the water pipe 1.

By the way, as described above, even if the exhaust valve 11 is closed after the exhaust process, the air mass S exists in the portion above the exhaust port 9 in the auxiliary tank 6. And even if it becomes a normal water supply state and the air lump S in the said auxiliary tank 6 is compressed, this air lump S remains on the top part of the auxiliary tank 6. That is, since the check valve 8 is always in the air,
Even if the water supply is sewage or the like and contains dust or oils and fats, it does not adhere to the check valve 8 and cause malfunction. In addition, since the exhaust valve 11 is forcibly opened and closed manually or by power, it can be reliably opened and closed even when the water supply is sewage or the like.

FIG. 2 shows a second aspect of the present invention.
In the case of the present invention, if a slight air leak occurs from the valve seat or the like of the check valve 8, the compressed air mass S
Gradually leaks from the check valve 8, the liquid level W in the auxiliary tank 6 rises with this, and the check valve 8 portion eventually becomes submerged, and when the water supply is sewage or the like, the check valve 8 opens and closes. In some cases, smoothness is impaired. In the second invention, such a measure against air leakage of the check valve 8 is taken.

That is, the upper part of the auxiliary tank 6 is connected to the conduit 12
A first liquid level detecting means 15 comprising two detection rods 15a and 15b is provided in the auxiliary tank 6 while an on-off valve 14 is provided in the conduit 12 while communicating with a pressure gas source (or compressor) 13 by means of It is a thing.

When the check valve 8 and the like are normal and air does not leak from the valve seat or the like, the reference liquid level in the auxiliary tank 6 is changed to W _1.
When the detection rod 15a is used to detect that the liquid level has reached the reference liquid level W ₁ to the upper limit liquid level W ₂ of the upper, detects that the liquid level has reached the upper limit liquid level, the on-off valve 14 is opened, and pressurized gas is supplied from the pressurized gas source 13 into the auxiliary tank 6. On the other hand, detection rod 15b is the supply of the pressurized gas, then, used for detecting that the liquid level has reached the lower limit liquid level W _3, is intended for closing the on-off valve 14 by the detection.

Therefore, even if there is an air leak in the check valve 8 or the like, the check valve 8 is always located in the air, and the smoothness of the opening / closing operation is not impaired.

FIG. 3 shows a third aspect of the present invention. During the water supply operation, air or organic gas may be generated from the water supply for some reason. The liquid lowers in the auxiliary tank 6 due to the gas,
Eventually, the gas moves through the water supply pipe 1 without accumulating in the auxiliary tank 6 and stays in the air pocket portion in the water supply pipe 1, which may hinder normal operation of the plant or the like.

Therefore, the third invention prevents the above-mentioned problem. That is, the auxiliary tank 6, a bottom portion substantially the same position W ₄ of the liquid surface is the exhaust port 9, also, two detection rod for detecting that has reached the top and substantially the same position W ₅ 16
a, it provided a second liquid level detector 16 consisting 16b, and detects the detection rod 16a that drops the liquid level W of the auxiliary tank 6 from the reference liquid surface W ₁ is the W _4, the exhaust valve 11 To release. With this opening, a part of the air mass and / or the water supply in the auxiliary tank 6 is discharged from the exhaust pipe 10. Then, in which the liquid level detection rod 16b rises to W ₅ was made to close the exhaust valve 11 to detect the rise.

Therefore, since the gas storage space always exists in the auxiliary tank 6, the gas generated in the water supply pipe 1 is retained and captured in the auxiliary tank 6. In FIG. 3, the third invention is described in addition to the second invention.
It is not always necessary to take measures against air leakage in the auxiliary tank 6 of the invention. However, with the configuration shown in FIG. 3, the intake and exhaust device can always maintain a normal intake and exhaust function. In this case, the detection rod 15a and the detection rod 16b can be shared. Further, the auxiliary tank 6 may be constituted by a pipe.

[0017]

As is apparent from the above description, according to the first invention, there is always an air mass above the auxiliary tank, the check valve is always in the air, Since the exhaust valve forcibly opens and closes, the intake and exhaust device operates normally regardless of the nature of the water supply.

According to the second invention, in addition to the effect of the first invention, even if air leakage occurs in the auxiliary tank, if the liquid level in the auxiliary tank rises to a predetermined level or more, a pressurized gas is supplied. As a result, the check valve is not immersed in the contaminated water supply and does not become inoperable.

According to the third invention, in addition to the effect of the first invention, when the liquid level in the auxiliary tank drops to near the bottom of the exhaust port,
Since the exhaust valve is opened, the gas can be captured by the auxiliary tank even when the water is supplied such that the gas is generated, so that there is an effect that the plant and the like can be prevented from being disturbed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of the first invention.

FIG. 2 is a partial cross-sectional front view of a main part of the second invention.

FIG. 3 is a partial cross-sectional front view of a main part of a third invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water pipe, 4 ... Intake / exhaust port, 5 ... Intake / exhaust device, 6 ... Auxiliary tank, 8 ... Check valve, 9 ... Exhaust port, 11 ... Exhaust valve, 13 ... Pressure gas source, 14 ... Open / close valve, 15 ... First detecting means, 16 ...
Second detecting means, S ... Air masses, W, W ₁ ~W ₅ ... liquid level.

Claims (3)

(57) [Claims] 1. An auxiliary tank provided in communication with a suction / exhaust port of a water pipe, an exhaust port provided at a lower portion of the auxiliary tank, and an exhaust valve attached to the exhaust port and forcibly opened during an exhaust process. A check valve attached to the upper part of the auxiliary tank and automatically opening at the time of an intake process. 2. An auxiliary tank provided in communication with a suction / exhaust port of a water pipe, an exhaust port provided at a lower portion of the auxiliary tank, and an exhaust valve attached to the exhaust port and forcibly opened during an exhaust process. A check valve attached to the upper part of the auxiliary tank and automatically opened at the time of the suction process, a high-pressure gas source connected to the upper part of the auxiliary tank via an on-off valve, and a liquid level in the auxiliary tank is the exhaust port. First liquid level detecting means for detecting when the liquid level has reached a predetermined upper limit position above and when the liquid level has dropped to a predetermined lower limit position, and when the first detecting means detects the upper limit position, the open / close valve , And thereafter, when the lower limit position is detected, the on-off valve is closed. 3. An auxiliary tank provided in communication with an intake / exhaust port of a water pipe, an exhaust port provided at a lower portion of the auxiliary tank, and an exhaust valve attached to the exhaust port and forcibly opened during an exhaust process. A check valve attached to the upper part of the auxiliary tank and automatically opening at the time of the suction process; and a second valve for detecting that the liquid level in the auxiliary tank reaches the upper end position and the lower end position of the exhaust port in the auxiliary tank. A liquid level detecting means, wherein the exhaust valve is opened when detecting that the liquid level has reached the lower end position from the upper end position, and then closed when detecting that the liquid level has reached the upper end position. A suction and exhaust device characterized by the following.