JP7110683B2 - Valve opening and closing method in drain water discharge device, and drain water discharge device - Google Patents

Description

The present invention relates to a valve opening and closing method in a drain water discharge device and a drain water discharge device applied to gas piping.

For example, steel plants are provided with gas pipes for transporting gas (by-product gas) generated in a blast furnace. In this gas pipe, as the gas is gradually cooled during transportation, water vapor in the gas condenses on the inner wall surface of the gas pipe, and the condensate generated by this condensation becomes drain water and accumulates in the gas pipe. be done.

In order to automatically discharge the drain water accumulated in this gas pipe, a drain water discharge device is generally connected to the gas pipe. This drain water discharge device includes, for example, an inlet pipe extending vertically and having an upper end connected to a gas pipe, a seal pot arranged below the gas pipe and connected to the lower end of the inlet pipe, and an inlet pipe extending vertically. There is a U-tube system in which the lower end of the seal tube is connected to a seal pot, and at least a part of the seal pot, the inlet tube, and the seal tube is filled with drain water.

By the way, in such a U-tube type drain water discharge device, for example, when the internal pressure of the gas pipe increases, the drain water in the inlet pipe is pushed down, and the drain water (seal water) is ejected from the seal pipe. Or, for example, it is assumed that drain water leaks from the seal pot due to corrosion and puncture.

Then, when the drain water flows out from the drain water discharging device due to the drain water spouting or leaking in this way, gas may be blown out from the drain water discharging device. Since this gas may contain carbon monoxide, combustible components, etc., it is desirable to prevent the gas from blowing out.

Therefore, various techniques have been proposed to prevent the gas from blowing out from the drain water discharge device.

For example, Patent Literature 1 discloses a gas discharge prevention device provided on a seal tube. This gas discharge prevention device is provided on the inner wall surface of a seal pipe (delivery side pipe) and includes a flange portion having an opening, a float arranged above the flange portion, and a stopper arranged below the flange portion. , and a central shaft connecting the float and the stopper.

In this gas discharge prevention device, when the internal pressure of the gas pipe increases and the drain water level in the seal pipe rises, the stopper rises together with the float and closes the opening of the flange. According to this gas discharge prevention device, it is possible to prevent drain water from being ejected from the seal pipe by closing the opening of the flange with the stopper.

Further, in Patent Document 2, in a U-shaped drain water discharge device, the pressure receiving area of the inlet pipe on the side that receives the internal pressure of the gas pipe is 100 times or more than the pressure receiving area of the seal pipe on the side that receives atmospheric pressure. is disclosed. According to this technology, even if the internal pressure of the gas pipe increases, the height of the water column in the inlet pipe can be suppressed from decreasing, so the installation height of the gas shutoff valve provided in the inlet pipe can be reduced. It is said to be possible.

Further, Patent Document 3 discloses a U-tube type drain water discharge device in which an electromagnetic valve is provided in a seal pipe (drain discharge pipe), and when the internal pressure of the gas pipe increases, the electromagnetic valve is closed by a control unit. A technology is disclosed that is controlled so that the According to this technique, even if the internal pressure of the gas pipe increases, it is possible to prevent the drain water from blowing out from the seal pipe by closing the electromagnetic valve.

JP-A-3-188209 Japanese Patent Application Laid-Open No. 2007-170580 JP-A-4-222393

However, the techniques of Patent Documents 1 to 3 have the following problems.

That is, in the gas discharge prevention device described in Patent Document 1, when the increase rate of the internal pressure of the gas pipe is small, the float does not rise and the stopper does not close. If the pressure continues to be low enough to prevent the stopper from closing, there is a risk that the drain water will escape from the seal pipe and gas will blow out from the upper end opening of the seal pipe.

In addition, Patent Document 1 does not disclose a seal pot. There is a risk that drain water will escape from the U-shaped pipe portion, and gas will blow out from the corroded and punctured portion of the U-shaped pipe portion.

Further, in the technique described in Patent Document 2, if the internal pressure of the gas pipe continues to be high, there is a risk that the drain water will escape from the seal pipe and the gas will blow out from the upper end opening of the seal pipe. Further, if a corroded hole occurs in the seal pot, and drain water leaks from the corroded hole, there is a risk that the drain water will escape from the seal pot and gas will blow out from the corroded hole in the seal pot. be.

Also, in the technique described in Patent Document 3, for example, when a corroded hole occurs in the seal pot and drain water leaks from the corroded hole, the drain water escapes from the seal pot and corrodes in the seal pot. There is a risk that gas will blow out from the perforated portion.

As described above, the techniques disclosed in Patent Documents 1 to 3 have the problem that gas may blow out from the seal pipe or seal pot of the U-shaped drain water discharge device. Therefore, in the U-tube type drain water discharge device, there is room for improvement in order to prevent gas from blowing out from the seal pipe or the seal pot.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for opening and closing a valve in a drain water discharge device and a drain water discharge device that can prevent gas from blowing out from a seal pipe or a seal pot. With the goal.

In order to solve the above-mentioned problems, a method for opening and closing a valve in a drain water discharge device of the present invention includes: an inlet pipe extending vertically and having an upper end connected to a gas pipe; and an inlet pipe arranged below the gas pipe. a seal pot having a lower end connected thereto; a vertically extending seal pipe having a lower end connected to the seal pot; drain water filling the seal pot and at least a part of the inlet pipe and the seal pipe; A drain water discharge device provided inside an inlet pipe and having a valve mechanism capable of opening and closing the inlet pipe is used, and when the internal pressure of the gas pipe increases and from the seal pot of the drain water discharge device When drain water leaks, the valve mechanism is closed as the water level of the drain water in the inlet pipe decreases.

According to the valve opening and closing method in this drain water discharge device, the valve mechanism capable of opening and closing the inlet pipe is provided on the inlet pipe side instead of the conventional seal pipe side, so that when the internal pressure of the gas pipe increases, , the valve mechanism provided inside the inlet pipe is closed as the drain water level in the inlet pipe decreases. At this time, the valve quickly closes as the drain water level in the inlet pipe drops. As a result, drain water is prevented from leaking out of the seal pipe, so it is possible to prevent gas from blowing out from the seal pipe.

Also, for example, when drain water leaks from the seal pot due to corrosion rupture, the valve provided inside the inlet pipe is closed as the drain water level in the inlet pipe decreases. As a result, the inlet pipe located on the upstream side of the seal pot is closed, so even if the drain water escapes from the seal pot, it is possible to prevent the gas from blowing out from the seal pot.

Further, the drain water discharge device of the present invention comprises: an inlet pipe extending vertically and having an upper end connected to a gas pipe; a seal pot arranged below the gas pipe and connected to the lower end of the inlet pipe; a seal pipe extending in a direction and having a lower end connected to the seal pot; drain water filling the seal pot, the inlet pipe and at least a part of the seal pipe; and a valve seat provided inside the inlet pipe. a first float arranged above the valve seat; a second float arranged below the valve seat; a connecting member that connects the first float and the second float; a valve that is provided on the float and that engages with the valve seat to block the inlet pipe when the first float descends, and when the internal pressure of the gas pipe increases, the second The buoyant force generated by the float being immersed in the drain water is smaller than the sum of the force exerted on the second float by the increased internal pressure and the weight of the second float, and the first float and the second float are The buoyancy generated by immersion in the drain water is greater than the sum of the force exerted on the first float and the second float by the increased internal pressure and the weights of the first float and the second float. and

According to this drain water discharge device, when the internal pressure of the gas pipe increases, the drain water in the inlet pipe is pushed down, the first float and the second float affected by the drain water level drop, and the first float A valve on the valve engages the valve seat to close the inlet pipe. At this time, the valve quickly closes as the drain water level in the inlet pipe drops. As a result, drain water is prevented from leaking out of the seal pipe, so it is possible to prevent gas from blowing out from the seal pipe.

Also, for example, when drain water leaks from the seal pot due to corrosion and rupture, the water level of the drain water in the inlet pipe drops due to the water leakage. As a result, the valve is fitted to the valve seat and closed. As a result, the inlet pipe located on the upstream side of the seal pot is closed, so even if the drain water escapes from the seal pot, it is possible to prevent the gas from blowing out from the seal pot.

In this case, the buoyancy generated by submerging the second float in the drain water is smaller than the sum of the force exerted on the second float by the increased internal pressure and the weight of the second float. The buoyancy of the second float, which is below the valve seat and is submerged in drain water, cannot open the inlet pipe.

In addition, when the internal pressure of the gas pipe increases and the inlet pipe is closed, drain water from the gas pipe accumulates above the valve seat. The water level of the drain water gradually rises, but the buoyancy generated by the immersion of the first float and the second float in the drain water causes the increased internal pressure of the gas pipe to increase the first float and the greater than the sum of the force on the second float and the weight of the first float and the second float, thereby lifting the first float and the second float to move the valve away from the valve seat. The valve seat is separated and opened, and the drain water accumulated above the valve seat flows downward (first operation).

Subsequently, when the valve seat is opened, the drain water flows from the upper side to the lower side of the valve seat. Therefore, as the drain water level in the inlet pipe above the valve seat decreases, the first float and the Since the buoyancy generated by the second float decreases and the first float and the second float descend, the valve engages the valve seat and quickly closes (second operation).

By repeating the first operation and the second operation, it is possible to stably discharge the drain water while preventing the gas from blowing out.

Furthermore, when the internal pressure of the gas pipe returns to normal pressure, there is no force to push down the drain water in the inlet pipe, and the drain water level rises to near the position before the internal pressure increase. The second float rises as the drain water level rises, opening the inlet pipe. This open state is maintained until the internal pressure of the gas pipe increases again. As a result, even if the internal pressure returns to the normal pressure, it is possible to stably discharge the drain water while preparing for the ejection of gas.

Further, in the drain water discharge device of the present invention, the buoyancy generated when the first float is submerged in the drain water accumulated on the valve seat is smaller than the total weight of the first float and the second float. characterized by

According to this drain water discharge device, when the drain water leaks from the seal pot and the drain water level in the inlet pipe is lowered, the valve is closed and the above-described Even if the drain water level in the inlet pipe rises, the buoyancy acting on the first float does not act on the second float due to the drain water coming out of the inlet pipe below the valve seat, and the buoyant force acting on the first float increases. By falling below the combined gravity of one float and the second float, the valve remains closed.

According to this drain water discharge device, when the drain water leaks from the seal pot, the drain water level in the inlet pipe decreases and the drain water level in the inlet pipe rises above the valve seat when the valve is closed. rises, the valve remains closed. Therefore, it is possible to maintain a state in which gas is prevented from blowing out from the seal pot.

Further, the drain water discharge device of the present invention has a restriction wire that restricts the movement of the first float with respect to the valve seat, and the restriction wire extends in a state where the first float rises and the restriction wire extends. In the above, the second float has a length such that it is spaced downward from the valve seat.

This drain water discharge device has, for example, a restriction wire that connects the valve seat and the first float, the valve or the connection member to restrict movement. The limit wire is set to a length such that the second float is spaced downward from the valve seat when the first float is raised and the limit wire is extended. Therefore, even if the drain water level in the inlet pipe rises above the valve seat, the second float can be maintained in a state of being spaced downward from the valve seat by limiting the rise of the first float above a certain level. This prevents the second float from coming into contact with the valve seat and closing the inlet pipe. Moreover, it is possible to prevent foreign matter from being caught between the second float and the valve seat due to the second float coming into contact with the valve seat.

As described in detail above, according to the present invention, in a U-tube type drain water discharge device, it is possible to prevent gas from blowing out from the seal pipe or the seal pot.

1 is a longitudinal sectional view showing gas piping equipment to which a drain water discharge device according to an embodiment of the present invention is applied; FIG. FIG. 2 is a two-sided view (longitudinal sectional view and bottom view) of the valve mechanism shown in FIG. 1; 2 is a diagram for explaining the operation of the valve mechanism when the internal pressure of the gas pipe shown in FIG. 1 increases; FIG. FIG. 3 is a diagram for explaining the operation of the valve mechanism when drain water leaks from the seal pot shown in FIG. 1; FIG. 2 is a longitudinal sectional view showing a first modified example of the valve mechanism shown in FIG. 1; FIG. 3 is a longitudinal sectional view showing a second modified example of the valve mechanism shown in FIG. 1; FIG. 3 is a longitudinal sectional view showing a third modification of the valve mechanism shown in FIG. 1; FIG. 10 is a longitudinal sectional view showing a fourth modification of the valve mechanism shown in FIG. 1; FIG. 2 is a longitudinal sectional view showing gas piping equipment to which a drain water discharge device according to a first comparative example is applied; FIG. 10 is a longitudinal sectional view showing gas piping equipment to which a drain water discharge device according to a second comparative example is applied; FIG. 11 is a vertical cross-sectional view showing gas piping equipment to which a drain water discharge device according to a third comparative example is applied; FIG. 11 is a vertical cross-sectional view showing gas piping equipment to which a drain water discharge device according to a fourth comparative example is applied;

An embodiment of the present invention will be described below.

FIG. 1 is a vertical cross-sectional view showing gas piping equipment to which a drain water discharge device 10 according to one embodiment of the present invention is applied. The gas piping equipment shown in FIG. 1 is installed, for example, in a steel plant, and has a gas piping 1 and a drain water discharge device 10 .

The gas pipe 1 is for transporting gas (by-product gas) generated in the blast furnace, and is laid horizontally. In this gas pipe 1, as the gas is gradually cooled during transportation, the water vapor in the gas condenses on the inner wall surface of the gas pipe 1, and the drain generated by this condensation gathers and becomes drain water. accumulated within.

A drain water discharge device 10 is for automatically discharging drain water accumulated in the gas pipe 1 and is connected to the gas pipe 1 . This drain water discharge device 10 includes an inlet pipe 11 extending vertically and having an upper end connected to the gas pipe 1; a seal pot 12 arranged below the gas pipe 1 and connected to the lower end of the inlet pipe 11; It is a U-shaped tube system having a seal tube 13 extending in the direction and having a lower end connected to a seal pot 12 .

A protrusion 14 is formed at the lower end of the inlet pipe 11 so as to protrude inside the seal pot 12 . Further, the upper end of the seal tube 13 is open upward. An upper end of a drain pipe 15 is connected to an upper portion (below the upper end) of the seal pipe 13, and a lower end of the drain pipe 15 opens downward.

The seal pot 12 is filled with drain water, and at least part of the inlet pipe 11 and the seal pipe 13 is filled with drain water. FIG. 1 shows a state in which drain water 16 is enclosed from the lower portion of inlet pipe 11 to the upper portion of seal pipe 13 . The height of the connection port of the seal pipe 13 to the drain pipe 15 is set to be higher than the upper surface of the drain water in the inlet pipe 11 by the pressure head H corresponding to the normal internal pressure of the gas pipe 1. ing. That is, a difference corresponding to the pressure head H is generated between the water level of the drain water filling the inlet pipe 11 and the water level of the drain water filling the seal pipe 13, thereby canceling out the pressure difference between the internal pressure of the gas pipe 1 and the atmospheric pressure. I'm trying

By the way, in general, in such a U-tube type drain water discharge device 10, when the internal pressure of the gas pipe 1 increases, the drain water ( It is assumed that sealing water) will be ejected. When the drain water spouts out from the upper end opening of the seal pipe 13 in this way and the drain water escapes from the seal pipe 13 , gas may blow out from the upper end opening of the seal pipe 13 .

Further, in such a U-tube type drain water discharge device 10, if a corrosion hole occurs in the seal pot 12, as indicated by the imaginary line (B), the corroded hole in the seal pot 12 will start to flow. Drain water is assumed to leak. If the drain water leaks from the corroded and ruptured portion of the seal pot 12 in this way and the drain water escapes from the seal pot 12 , there is a risk that gas will blow out from the corroded and ruptured portion of the seal pot 12 . Since this gas may contain carbon monoxide, combustible components, etc., it is desirable to prevent the gas from blowing out.

Therefore, the valve mechanism 20 is applied to the inlet pipe 11 in the drain water discharge device 10 according to the present embodiment as a technique for preventing the ejection of gas. FIG. 2 is a two-sided view (longitudinal sectional view and bottom view) of the valve mechanism 20 shown in FIG. As shown in FIG. 2, the valve mechanism 20 has a valve seat 22, a first float 24, a second float 26, a connecting member 28 and a plurality of restriction wires 30. As shown in FIG. 2, the illustration of the valve seat 22 shown in the longitudinal sectional view of FIG. 2 is omitted.

The valve seat 22 has a disc shape with a plate thickness direction in the vertical direction, and is provided inside the inlet pipe 11 . A circular opening 32 is formed through the valve seat 22 in the vertical direction.

A first float 24 and a second float 26 are provided inside the inlet pipe 11 . A first float 24 is arranged above the valve seat 22 and a second float 26 is arranged below the valve seat 22 . The first float 24 is formed in a vertically long shape, and as an example, is formed in the shape of an inverted truncated cone. The second float 26 is, for example, cylindrical.

The first float 24 and the second float 26 are made of a material having a lower density than the drain water as a whole, and have a lower specific gravity than the drain water. The first float 24 and the second float 26 are made of the same material, for example. It should be noted that the first float 24 is preferably configured to have a larger buoyancy than the second float 26 by making it larger in volume than the second float 26 made of the same material. Therefore, when the valve mechanism 20 operates, which will be described in detail later, the first float 24 and the second float 26 are in a vertical positional relationship, so that the operation can be stabilized. The first float 24 and the second float 26 are configured with volumes that allow operation of the valve mechanism 20, which will be described in detail later.

The connecting member 28 is formed in a rod shape and extends in the vertical direction. This connecting member 28 connects the first float 24 and the second float 26 through the opening 32 of the valve seat 22 . A valve 34 is integrally formed with the first float 24 . For example, the valve 34 may be formed by the outer periphery of the first float 24 formed in the shape of an inverted truncated cone. The valve 34 is shaped to fit with the opening 32 . In the valve mechanism 20 , the valve 34 contacts the valve seat 22 and engages with the opening 32 to close the opening 32 and close the inlet pipe 11 .

A plurality of restriction wires 30 are arranged at regular intervals in the circumferential direction of the valve seat 22 . The plurality of restriction wires 30 connect the valve seat 22 and the first float 24 respectively. The plurality of restriction wires 30 are set to a length such that the second float 26 is spaced downward from the valve seat 22 when the first float 24 is raised and the restriction wires 30 are extended. In other words, with the first float 24 raised and the limit wires 30 extended, the length of the plurality of limit wires 30 is such that the second float 26 does not contact the valve seat 22 and block the opening 32 . is set.

Next, the operation of the above-described valve mechanism 20 will be described as a valve opening/closing method in the drain water discharge device of this embodiment.

(When the internal pressure of the gas pipe is normal pressure)
First, the operation of the valve mechanism 20 when the internal pressure of the gas pipe 1 shown in FIG. 1 is normal pressure will be described.

When drain water flows into the inlet pipe 11 from the gas pipe 1 shown in FIG. Further, the internal pressure of the gas pipe 1 acts on the upper surface of the drain water in the inlet pipe 11, the drain water in the inlet pipe 11 is pushed down, and part of the drain water stored in the seal pot 12 moves toward the seal pipe 13 side. is pushed up and flows into the seal pipe 13.

At this time, as shown in FIG. 2, the first float 24 and the second float 26 provided inside the inlet pipe 11 try to float by being fully submerged in the drain water, but the first float 24 A limit wire 30 is connected to the valve seat 22 to limit the floatation of the first float 24 and the second float 26 . As a result, the valve 34 is kept open, so that when drain water flows from the gas pipe 1 into the inlet pipe 11 , the drain water that has flowed in passes through the opening 32 of the valve seat 22 and is discharged from the seal pipe 13 . It is discharged through tube 15 .

(when the internal pressure of the gas pipe increases)
Next, the operation of the valve mechanism 20 when the internal pressure of the gas pipe 1 shown in FIG. 1 increases will be described. FIG. 3 is a diagram for explaining the operation of the valve mechanism 20 when the internal pressure of the gas pipe 1 shown in FIG. 1 increases.

When the internal pressure of the gas pipe 1 shown in FIG. 1 increases, the upper surface of the drain water in the inlet pipe 11 is pushed and the drain water level in the inlet pipe 11 drops as shown in (1) of FIG.

Then, the second float is adjusted so that the buoyancy generated by submerging the second float 26 in the drain water is smaller than the sum of the force exerted on the second float 26 by the increased internal pressure and the weight of the second float. 26 is configured, as shown in (2) of FIG. The inlet pipe 11 is closed by fitting into the seat 22 . At this time, since the valve 34 is interlocked with the decrease in the drain water level in the inlet pipe 11, the valve 34 is quickly closed.

As a result, drain water is prevented from escaping excessively from the seal pipe 13 shown in FIG.

In the valve mechanism 20, the valve 34 is closed as the drain water level in the inlet pipe 11 decreases, as described above. Therefore, in addition to the case where the internal pressure of the gas pipe 1 increases rapidly, the valve 34 is also closed when the internal pressure of the gas pipe 1 gradually increases (when the increase rate of the internal pressure of the gas pipe 1 is small). is closed, and gas is prevented from blowing out from the seal tube 13 .

Next, as shown in (3) of FIG. 3, the drain water level in the inlet pipe 11 rises above the valve seat 22, and the total buoyancy of the first float 24 and the second float 26 gradually increases. Then, the buoyancy generated when the first float 24 and the second float 26 are immersed in drain water is the force exerted by the increased internal pressure on the first float 24 and the second float 26, and the first float 24 and the second float Since the first float 24 and the second float 26 are configured to be greater than the sum of the weights of the floats 26, the drain water above the valve seat 22 increases and the first float 24 and the second float 26 increases, the first float 24 and the second float 26 rise accordingly. As a result, the valve 34 is separated from the valve seat 22 to be in an open state, and the drain water accumulated above the valve seat 22 flows downward. The operation in which the valve 34 is separated from the valve seat 22 to open and the drain water accumulated above the valve seat 22 flows downward is hereinafter referred to as the first operation.

On the other hand, when drain water flows from the upper side to the lower side of the valve seat 22, the drain water level in the inlet pipe 11 is lowered above the valve seat 22, and accordingly the buoyancy generated by the first float 24 and the second float 26 is increased. The first float 24 and the second float 26 descend quickly. As a result, the valve 34 is fitted to the valve seat 22 to be closed, as shown in FIG. 3(2). The operation in which the valve 34 is fitted to the valve seat 22 to be in the closed state is hereinafter referred to as the second operation.

When the internal pressure of the gas pipe 1 returns to the normal pressure while the above-described first operation and second operation are repeated, the drain water level in the inlet pipe 11 rises as shown in (4) of FIG. The height shown in FIG. 3(1) is reached. Along with this, as the drain water level rises, the buoyancy generated by the first float 24 and the second float 26 increases, and the first float 24 and the second float 26 rise, thereby separating the valve 34 from the valve seat 22. open. That is, the valve mechanism 20 returns to the original state before the internal pressure of the gas pipe 1 increased.

As a result, when the internal pressure of the gas pipe 1 increases again and the drain water level in the inlet pipe 11 decreases, the first float 24 and the second float 26 move downward, causing the valve 34 to move against the valve seat 22. It is mated and closed. After that, the valve 34 is repeatedly opened and closed in response to fluctuations in the internal pressure of the gas pipe 1 .

The movement of the first float 24 with respect to the valve seat 22 is restricted by connecting either the first float 24 , the valve 34 or the connecting member 28 to the valve seat 22 with a restricting wire 30 . Therefore, even if the drain water level in the inlet pipe 11 rises above the valve seat 22, as shown in FIG. is kept spaced downward from the valve seat 22 . This prevents the second float 26 from contacting the valve seat 22 and closing the inlet pipe 11 (blocking the opening 32 of the valve seat 22).

(When drain water leaks from the seal pot)
Next, the operation of the valve mechanism 20 when drain water leaks from the seal pot 12 shown in FIG. 1 due to corrosion and rupture will be described. FIG. 4 is a diagram for explaining the operation of the valve mechanism 20 when drain water leaks from the seal pot 12 shown in FIG.

When a corroded hole occurs in the seal pot 12 shown in FIG. 1 and drain water leaks from the seal pot 12, the drain water level in the inlet pipe 11 drops as shown in (1) of FIG.

Then, as shown in (2) of FIG. 4, the first float 24 and the second float 26 are lowered as the drain water level in the inlet pipe 11 is lowered, so that the valve 34 is fitted to the valve seat 22. closed. As a result, the inlet pipe 11 located on the upstream side of the seal pot 12 shown in FIG. be.

Also, as described above, when the drain water level in the inlet pipe 11 drops due to the drain water leaking from the seal pot 12 and the valve 34 is closed accordingly, the valve mechanism 20 thereafter operates as follows. works like

That is, as shown in (3) of FIG. 4 , since the valve 34 remains closed, the drain water level in the inlet pipe 11 rises above the valve seat 22 . Here, the first float 24 and the second float 26 have a buoyant force that is greater than the total weight of the first float 24 and the second float 26 when the first float 24 is immersed in the drain water that accumulates on the valve seat 22. designed to be small. Therefore, below the valve seat 22 , since the drain water is removed from the inlet pipe 11 , buoyancy does not act on the second float 26 . Also, as shown in FIG. 4(4), buoyancy acts only on the first float 24 due to drain water accumulated above the valve seat 22, but this buoyancy is the total gravity of the first float 24 and the second float 26. , the valve 34 remains closed. As a result, the seal pot 12 is maintained in a state in which the gas is prevented from blowing out.

Next, the operation and effects of this embodiment will be described.

First, in order to clarify the action and effect of this embodiment, a comparative example will be described. FIG. 9 is a longitudinal sectional view showing gas piping equipment to which the drain water discharge device 110 according to the first comparative example is applied. A drain water discharge device 110 according to a first comparative example shown in FIG. 9 is obtained by omitting the valve mechanism 20 from the drain water discharge device 10 (see FIG. 1) according to the present embodiment described above.

In the drain water discharge device 110 according to the first comparative example, the height of the connection port of the seal pipe 13 with the drain pipe 15 is set to the normal internal pressure of the gas pipe 1 with respect to the upper surface of the drain water in the inlet pipe 11. is set to be higher by a pressure head H corresponding to .

However, in the drain water discharge device 110 according to the first comparative example, when the internal pressure of the gas pipe 1 increases, drain water (seal water) flows from the upper end opening of the seal pipe 13 as indicated by the imaginary line (A). is expected to erupt. When the drain water spouts out from the upper end opening of the seal pipe 13 in this way and the drain water escapes from the seal pipe 13 , gas may blow out from the upper end opening of the seal pipe 13 .

In addition, in the drain water discharge device 110 according to the first comparative example, when a corrosion hole occurs in the seal pot 12, drain water leaks from the corroded hole as indicated by the imaginary line (B). It is assumed that If the drain water leaks from the corroded and ruptured portion of the seal pot 12 in this way and the drain water escapes from the seal pot 12 , there is a risk that gas will blow out from the corroded and ruptured portion of the seal pot 12 .

FIG. 10 is a longitudinal sectional view showing gas piping equipment to which a drain water discharge device 120 according to a second comparative example is applied. A drain water discharge device 120 according to a second comparative example shown in FIG. is assumed to occur.

In the drain water discharge device 120 according to the second comparative example, the height H′ of the connection port of the seal pipe 13 to the drain pipe 15 is set to the normal height of the gas pipe 1 with respect to the upper surface of the drain water in the inlet pipe 11. It is set to be higher by the pressure head H corresponding to the internal pressure plus the pressure head ΔH corresponding to the increased pressure.

However, in the drain water discharge device 120 according to the second comparative example, it is necessary to increase the length of the inlet pipe 11 and the seal pipe 13 in response to the increase in the internal pressure of the gas pipe 1, so the equipment cost increases. do. In order to reduce the ground clearance of the seal pipe 13, it is conceivable to install the lower part of the drain water discharge device 120 in an underground pit or to bury it in the ground. Cost increases.

Further, in the drain water discharge device 120 according to the second comparative example, when the increase in the internal pressure of the gas pipe 1 exceeds expectations, as indicated by the imaginary line (A), from the upper end opening of the seal pipe 13 Drain water (seal water) spouts out. Then, there is a risk that the drain water will escape from the seal pipe 13 and the gas will blow out from the upper end opening of the seal pipe 13 .

Furthermore, also in the drain water discharge device 120 according to the second comparative example, if the seal pot 12 is, for example, corroded and punctured, as indicated by the imaginary line (B), drain water flows out from the corroded and punctured portion. Leak. Then, there is a risk that the drain water will escape from the seal pot 12 and the gas will blow out from the corroded and punctured portion of the seal pot 12 .

FIG. 11 is a vertical cross-sectional view showing gas piping equipment to which a drain water discharge device 130 according to a third comparative example is applied. The drain water discharge device 130 according to the third comparative example shown in FIG. 11 has a gas discharge prevention device 131 added to the seal pipe 13 in contrast to the drain water discharge device 110 (see FIG. 9) according to the first comparative example described above. It is

This gas discharge prevention device 131 is the same as that disclosed in the above-mentioned Patent Document 1. That is, the gas discharge prevention device 131 includes a flange 132 having an opening, a float 133 arranged above the flange 132, a stopper 134 arranged below the flange 132, the float 133 and the stopper 134. It has a connecting central axis 135 . A drain pipe 15 is connected to a position slightly above the normal drain water level in the seal pipe 13 . In this gas discharge prevention device 131, when the internal pressure of the gas pipe 1 increases and the drain water level in the seal pipe 13 rises, the float 133 and the stopper 134 rise as the drain water level rises, and the opening of the flange 132 reaches the stopper 134. blocked by

However, with this gas discharge prevention device 131, when the rate of increase in the internal pressure of the gas pipe 1 is small, the float 133 does not rise, drain water only leaks from the drain pipe 15, and the stopper 134 does not close. If the pressure continues to be low enough to prevent the stopper 134 from closing, there is a risk that drain water will escape from the seal pipe 13 and gas will blow out from the upper end opening of the seal pipe 13 . Further, when a corroded hole occurs in the seal pot 12, and drain water leaks from the corroded hole, the drain water escapes from the seal pot 12, and gas blows out from the corroded hole in the seal pot 12. there is a risk of

FIG. 12 is a vertical cross-sectional view showing gas piping equipment to which a drain water discharge device 140 according to a fourth comparative example is applied. A drain water discharge device 140 according to a fourth comparative example shown in FIG. there is

This solenoid valve 141 is the same as that disclosed in the above-mentioned Patent Document 3. In other words, when the internal pressure of the gas pipe 1 increases, the electromagnetic valve 141 is controlled by the controller 142 to be closed.

However, even in the drain water discharge device 140 according to the fourth comparative example, if a corroded hole occurs in the seal pot 12, and drain water leaks from the corroded hole, the drain water will escape from the seal pot 12. , there is a risk that gas will blow out from the corroded and punctured portion of the seal pot 12 .

On the other hand, the drain water discharge device 10 according to the present embodiment shown in FIG. 2 has the following advantageous effects as compared with the first to fourth comparative examples described above.

That is, according to the drain water discharge device 10 according to this embodiment, the inlet pipe 11 is provided with the valve mechanism 20 . Then, when the internal pressure of the gas pipe 1 increases, as shown in (1) and (2) of FIG. 3, the first float 24 and the second float The descent of 26 causes valve 34 to engage valve seat 22 and close. At this time, the valve 34 is quickly closed as the drain water level in the inlet pipe 11 decreases. As a result, drain water is prevented from leaking out of the seal pipe 13 , so that gas can be prevented from blowing out from the seal pipe 13 .

Further, in the valve mechanism 20, the valve 34 is closed as the drain water level in the inlet pipe 11 decreases, as described above. Therefore, in addition to the case where the internal pressure of the gas pipe 1 increases rapidly, the valve 34 is also closed when the internal pressure of the gas pipe 1 gradually increases (when the increase rate of the internal pressure of the gas pipe 1 is small). is closed, and the gas can be prevented from blowing out from the seal tube 13. - 特許庁

Moreover, when drain water accumulates on the upper side of the valve seat 22, the valve 34 is separated from the valve seat 22 to open, and the drain water accumulated on the upper side of the valve seat 22 flows downward. 3 (3)) and the second action (see (2) in FIG. 3) in which the valve 34 is fitted into the valve seat 22 to be in the closed state are repeated. Then, when the drain water level below the valve seat 22 reaches the height of the valve seat 22 and then the internal pressure of the gas pipe 1 returns to normal pressure, the drain water level in the inlet pipe 11 rises above the valve seat 22. As the first float 24 and the second float 26 rise, the valve 34 moves away from the valve seat 22 to open as shown in (4) of FIG.

As a result, the valve mechanism 20 returns to the original state before the internal pressure of the gas pipe 1 increased. Therefore, when the internal pressure of the gas pipe 1 increases again and the drain water level in the inlet pipe 11 decreases, the first float 24 and the second float 26 move downward, causing the valve 34 to fit into the valve seat 22. It can be closed by putting it together. As a result, the valve 34 can be repeatedly opened and closed in response to fluctuations in the internal pressure of the gas pipe 1 .

Further, according to the drain water discharge device 10 according to the present embodiment, even when drain water leaks from the seal pot 12 due to corrosion and puncture, for example, as shown in (1) and (2) of FIG. As the drain water level in the inlet pipe 11 decreases, the first float 24 and the second float 26 move downward, thereby fitting the valve 34 to the valve seat 22 and closing it. As a result, the inlet pipe 11 positioned on the upstream side of the seal pot 12 is closed, so even if the drain water leaks out of the seal pot 12, gas can be prevented from blowing out from the seal pot 12.例文帳に追加

In particular, the buoyancy generated when the first float 24 is immersed in the drain water accumulated on the valve seat 22 is configured to be smaller than the sum of the weights of the first float 24 and the second float 26. , when the drain water leaks from the seal pot 12, the drain water level in the inlet pipe 11 decreases, and the valve 34 is closed, as shown in (3) to (4) of FIG. , the closed state of the valve 34 continues even if the drain water level in the inlet pipe 11 rises above the valve seat 22 . Therefore, the seal pot 12 can be maintained in a state in which the gas is prevented from blowing out.

In addition, according to the drain water discharge device 10 according to the present embodiment, it is not necessary to increase the length of the inlet pipe 11 and the seal pipe 13 in response to an increase in the internal pressure of the gas pipe 1, so equipment costs can be reduced. be able to. In addition, since it is not necessary to install the lower part of the drain water discharge device 10 in an underground pit or to bury it in the ground in order to suppress the ground clearance of the seal pipe 13, the facility cost can also be suppressed. can be done.

Further, according to the drain water discharge device 10 according to the present embodiment, the mechanical valve mechanism 20 having the valve seat 22, the first float 24, the second float 26, the connecting member 28, and the valve 34 is use. Therefore, for example, compared with the case of using an electric valve mechanism having a solenoid valve, there is an advantage that the inlet pipe 11 can be closed even in the event of a power failure, and there is an advantage that the life of the valve mechanism 20 can be extended.

Furthermore, the drain water discharge device 10 according to this embodiment has the restriction wire 30 that restricts movement of the first float 24 with respect to the valve seat 22 . The limit wire 30 is set to a length such that the second float 26 is spaced downward from the valve seat 22 when the first float 24 is raised and the limit wire 30 is extended. Therefore, even if the drain water level in the inlet pipe 11 rises above the valve seat 22, the first float 24 is restricted from rising above a certain level, and the second float 26 is spaced downward from the valve seat 22. state can be maintained. This prevents the second float 26 from contacting the valve seat 22 and closing the inlet pipe 11 . In addition, it is possible to prevent foreign matter from being caught between the second float 26 and the valve seat 22 due to the second float 26 contacting the valve seat 22 .

Also, the valve 34 is formed integrally with the first float 24 . Therefore, compared to the case where the valve 34 is configured separately from the first float 24 and is spaced downwardly with respect to the first float 24, the first float including the valve 34 is more flexible. The vertical length of the entire float 24 can be shortened. Thereby, the height of the inlet pipe 11 can be reduced.

Also, the first float 24 is formed in a vertically long shape. Therefore, the diameter of the valve 34 formed integrally with the first float 24 and the diameter of the opening 32 of the valve seat 22 corresponding to this valve 34 can be reduced. As a result, the valve 34 and the opening 32 of the valve seat 22 can be formed with high accuracy, thereby preventing leakage of gas or drain water from between the valve 34 and the valve seat 22 when the valve 34 is closed. can.

Next, a modified example of this embodiment will be described.

5 to 8 are longitudinal sectional views showing first to fourth modifications of the valve mechanism 20 shown in FIG.

In the above embodiment, the first float 24 is formed in a vertically long shape. However, as shown in FIG. 5, the first float 24 may be formed in an oblong shape.

Thus, when the first float 24 is formed in a horizontally long shape, the vertical length of the first float 24 can be shortened, so the height of the inlet pipe 11 can be lowered. Further, when the internal pressure of the gas pipe 1 increases, the force acting on the upper surface of the first float 24 increases as the upper surface of the first float 24 increases. As a result, the first float 24 can be quickly lowered, so that the valve 34 integrally formed with the first float 24 can be quickly closed.

Moreover, in the above embodiment, the valve 34 is formed integrally with the first float 24 . However, as shown in FIG. 6, the valve 34 is provided on the first float 24 by being separate from the first float 24 and being connected to the first float 24 by a connecting member 36. Also good. Also in this case, the restriction wire 30 may connect the valve seat 22 and the valve 34 .

Further, in the above-described embodiment, the first float 24 is formed in an inverted truncated cone shape, and the second float 26 is formed in a cylindrical shape. However, as shown in FIG. 7, the first float 24 and the second float 26 may be spherically shaped. Also, the first float 24 and the second float 26 may have any other shape.

Moreover, in the above-described embodiment, the first float 24 has a larger volume than the second float 26 made of the same material, and thus has a larger buoyancy than the second float 26 . However, as shown in FIG. 8, the first float 24 may have less buoyancy than the second float 26 by having a smaller volume than the second float 26 made of the same material.

Also, the first float 24 may have the same shape and the same buoyancy as the second float 26 made of the same material. Also, the first float 24 and the second float 26 may be made of different materials.

In the above embodiment, the drain water discharge device 10 preferably has the mechanical valve mechanism 20 in the inlet pipe 11. Instead of the mechanical valve mechanism 20, for example, an electrical The inlet pipe 11 may have an appropriate valve mechanism. The electromagnetic valve may be closed in both cases, such as when the internal pressure of the gas pipe 1 increases and when drain water leaks from the seal pot 12 . Even in this way, it is possible to prevent the gas from blowing out from the seal tube 13 and the seal pot 12 .

Further, in the above embodiment, the valve mechanism 20 has the valve seat 22, the first float 24, the second float 26, the connecting member 28, and the valve 34 formed on the first float 24. may be a mechanical configuration.

In the above-described embodiment, the first float 24 is restricted from rising by the restricting wire 30, but its ascending is restricted by a structure other than the restricting wire 30, such as a convex portion projecting from the inner wall surface of the inlet pipe 11. can be

It should be noted that among the plurality of modifications described above, modifications that can be combined may be combined as appropriate.

An embodiment of the present invention has been described above, but the present invention is not limited to the above, and can of course be implemented in various modifications without departing from the gist of the present invention. is.

1 gas pipe 10 drain water discharge device 11 inlet pipe 12 seal pot 13 seal pipe 15 drain pipe 16 drain water 20 valve mechanism 22 valve seat 24 first float 26 second float 28 connecting member 30 restriction wire 32 opening 34 valve

Claims (4)

an inlet pipe extending vertically and having an upper end connected to a gas pipe;
a seal pot arranged below the gas pipe and connected to the lower end of the inlet pipe;
a seal tube extending vertically and having a lower end connected to the seal pot;
drain water filling the seal pot and at least a portion of the inlet pipe and the seal pipe;
a valve provided inside the inlet pipe and capable of opening and closing the inlet pipe;
Using a drain water discharge device having
When the internal pressure of the gas pipe increases and when drain water leaks from the seal pot of the drain water discharge device, the valve is closed as the drain water level in the inlet pipe decreases. do,
A method for opening and closing a valve in a drain water discharge device,
When the internal pressure of the gas pipe increases, the valve repeats opening and closing operations until the internal pressure returns to the level before the increase ,
When drain water leaks from the seal pot of the drain water discharge device, the valve continues to be closed even if the water level of the drain water in the inlet pipe rises after the valve is closed. A method for opening and closing a valve in a water discharge device. an inlet pipe extending vertically and having an upper end connected to a gas pipe;
a seal pot arranged below the gas pipe and connected to the lower end of the inlet pipe;
a seal tube extending vertically and having a lower end connected to the seal pot;
drain water filling the seal pot and at least a portion of the inlet pipe and the seal pipe;
a valve seat provided inside the inlet pipe;
a first float disposed above the valve seat;
a second float positioned below the valve seat;
a connecting member that connects the first float and the second float;
a valve that is provided on the first float and that engages with the valve seat to block the inlet pipe when the first float descends;
has
When the internal pressure of the gas pipe increases,
The buoyancy generated by the second float being immersed in the drain water is smaller than the sum of the force exerted on the second float by the increased internal pressure and the weight of the second float,
The buoyancy generated when the first float and the second float are immersed in the drain water consists of the force exerted on the first float and the second float by the increased internal pressure and the force exerted on the first float and the second float. drain water discharge device that is greater than the sum of the weights of 3. The drain water discharge device according to claim 2, wherein buoyancy generated by submerging said first float in said drain water accumulated on said valve seat is smaller than the total weight of said first float and said second float. a limit wire that limits movement of the first float relative to the valve seat;
The limit wire has a length such that the second float is spaced downward from the valve seat when the first float is raised and the limit wire is extended.
The drain water discharge device according to claim 2 or 3.

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