JP4633004B2 - Liquid-sealed drain trap - Google Patents

Description

  The present invention relates to a liquid-sealed drain trap that recovers drain while liquid-sealing a drain pipe in a drain pot to prevent gas ejection.

  Liquid-sealed drain traps are used in gas transport pipes that transport by-product gases such as blast furnace gas at steelworks in order to prevent moisture mixed in the gas from draining and staying inside the gas transport pipe. Yes. It is well known that liquid-sealed drain traps are often used to remove only drain from a pipe in which gas and drain flow separately from the gas transport pipe. FIG. 8 is a diagram showing a schematic configuration of a conventional liquid ring drain trap 1. The liquid ring drain trap 1 mainly includes a drain pipe 2, a drain pot 3, and a stop valve 10 connected to the drain pipe 2. The drain pot 3 stores a liquid 5 made of drain. The drain pipe 2 is connected at its upper end to a pipe 11 through which a gas 7 flows via a stop valve 10. The drain condensed after the moisture mixed in the gas is cooled and condensed in the pipe 11 is guided to the drain pipe 2. It flows down in the pipe 2. The drain pipe 2 has a lower end inserted into the liquid 5 in the drain pot 3, and collects the drain that has flowed down the drain pipe 2 while preventing the gas 7 from being ejected.

  The drain pot 3 includes an overflow pipe 4 at the top. The overflow pipe 4 is a pipe for discharging the drain from the drain pot 3 to the outside of the system, and a predetermined amount of the liquid 5 is stored in the drain pot 3 to form a liquid seal portion 6 in the drain pipe 2. 2 serves to prevent the gas 7 from being ejected. The stop valve 10 is provided for the purpose of avoiding danger by operating in an emergency such as when the liquid seal of the liquid seal portion 6 in the drain pipe 2 is broken and the gas 7 is ejected from the drain pipe 2. With the above configuration, the liquid seal drain trap 1 continuously collects the drain and prevents the gas 7 from being ejected from the drain pipe 2.

  In the conventional liquid seal drain trap 1, when the liquid seal of the liquid seal portion 6 in the drain pipe 2 is broken, the gas 7 is ejected from the drain pipe 2. When the liquid 5 stored in the drain pot 3 is reduced due to evaporation of the liquid 5 or damage to the drain pot 3, the liquid level in the drain pot 3 is lowered and the liquid level in the drain pipe 2 is also lowered. The liquid seal of the liquid seal portion 6 of the drain pipe 2 is broken. As a result, the gas 7 in the drain pipe 2 is ejected to the outside via the drain pot 3. Steelworks blast furnace gas, coke oven gas, etc. contain toxic or flammable gases such as carbon monoxide, hydrogen, methane, etc., and if these gases are ejected from the drain pipe 2 to the outside, there is a danger of causing a serious accident. There is sex. For this reason, the liquid level of the liquid seal drain trap 1 is periodically checked and the liquid is replenished as necessary.

Furthermore, even if the liquid level in the drain pot 3 is normal and the liquid sealing part 6 is maintained, the liquid sealing type drain trap 1 in the drain pot 3 is not sealed when the pressure in the pipe 11 rises. There was a problem that the rupture gas 7 was ejected to the outside via the drain pipe 2 and the drain pot 3. In order to solve this, the following liquid-sealed drain trap has been proposed (see, for example, Patent Document 1). In this technology, a pressure control valve, which is a wedge-shaped throttle, is provided in the drain pipe, and when a stopper that floats on water that can seal the throttle portion is inserted in the drain pipe, and the pressure in the drain pipe rises, the water level in the drain pipe is increased. The stopper is lowered and the pressure valve is closed. When the pressure in the drain pipe returns to normal, the water level in the drain pipe also rises, the plug is released from the pressure regulating valve, and the valve is opened.
JP 2001-193122 A

  The conventional liquid-sealed drain trap 1 shown in FIG. 8 has a simple structure and is inexpensive, but when the liquid level in the drain pot 3 is lowered, the liquid seal of the liquid-sealed portion 6 is broken and the gas 7 is ejected to the outside. End up. Furthermore, even if the liquid level in the drain pot 3 is normal and the liquid sealing part 6 is maintained, if the pressure in the pipe 11 rises, the liquid sealing of the liquid sealing part 6 is broken and the gas 7 is discharged from the drain pipe 2 and the drain. It spouts outside through the pot 3. On the other hand, in the technique described in Patent Document 1, since the plug floating in the drain pipe closes the pressure regulating valve, even if the liquid level in the drain pot decreases or the pressure in the pipe increases further, the plug As long as is functioning normally, it is assumed that gas does not spout outside. However, since the technique described in Patent Document 1 is to put a stopper in the drain pipe and close the throttle part in the drain pipe, the state where the stopper remains fixed to the throttle part or somewhere in the drain pipe As a result, the function of the liquid-sealed drain trap cannot be performed. Furthermore, since the throttle portion is simply plugged with a stopper, the sealing property between the stopper and the throttle portion is not sufficient, and gas may leak out to the outside.

  In order to check whether the stopper is functioning properly in the drain pipe, it is possible to make the drain pot and drain pipe with a transparent material that is visible from the outside. Can not be confirmed. If the drain is a clean liquid, the inside can be confirmed, but the drain is not always clean depending on where the liquid-sealed drain trap is used. Even if the inside of the drain pipe can be confirmed, it is not easy to unfasten and restore the stopper due to the structure.

  As described above, at present, when the liquid level in the drain pot is lowered or when the pressure in the pipe is raised, the liquid-sealed drain trap that can reliably prevent the gas from being ejected to the outside is It has not been developed and is waiting for development. Needless to say, this liquid-sealed drain trap is preferable if it has a simple structure and can be manufactured at low cost.

  An object of the present invention is to provide a liquid-sealed drain trap that has a simple structure and can reliably prevent gas ejection even when the liquid level in the drain pot decreases or the pressure in the drain pipe increases. Is to provide.

The liquid-sealed drain trap according to claim 1, wherein the drain pipe is liquid-sealed in a drain pot, and the drain is collected while preventing gas from being ejected.
Float body floats in the drain pipe, rod upper located in the drain pipe outside is protruded to the outside of the drain pot, located further down than the lower end of the drain pipe lower end and the lower end of the rod of the valve stem A float that moves up and down following the liquid level in the drain pipe, comprising a coupling material to be coupled;
The valve body comprises a fixed valve seat to said drain pipe, said the liquid level of said drain pipe is below a predetermined height valve body connected with the float up and down as the float integrally via the valve stem the includes, and against closing valve press the valve seat,
The valve body can be moved up and down by moving the rod up and down .

According to a second aspect of the invention, in the liquid seal type drain trap, the float is further characterized by having an auxiliary float body floats on the liquid surface of the drain in the pot.

According to a third aspect of the invention, in the liquid seal type drain trap, further position of the valve body comprises a valve element position informing means becomes below a predetermined height position of the valve body to inform that it has reduced It is characterized by.

According to a fourth aspect of the present invention , in the liquid seal drain trap, the valve body position notification means is a level switch .

The present invention is claimed in claim 5, wherein in the Liquid Ring drain trap, and the liquid level of the drain pipe in which the valve is closed, the height of the valve member position notifying means to notify that it has lowered the position of the valve body In contrast, the liquid level in the drain pipe where the valve is closed is lower than a height at which the valve body position notifying means notifies that the position of the valve body has been lowered .

According to a sixth aspect of the invention, in the liquid seal type drain trap, characterized by further comprising the possible valve position indicator member visible at the top of the rod.

According to the first aspect of the present invention, the liquid-sealed drain trap includes a float having a float body that floats on the liquid level in the drain pipe, a valve body that moves up and down integrally with the float, and a valve seat that is fixed in the drain pipe. And a valve that closes the valve body against the valve seat when the liquid level in the drain pipe falls below a predetermined height, so that when the liquid level in the drain pot decreases or the pressure in the drain pipe is high Even if the liquid level in the drain pot is normal or only the liquid level in the drain pipe is lowered, the valve in the drain pipe can be closed to prevent the gas from being ejected. Further , the valve body is connected to a rod body located outside the drain pipe via a valve rod and a connecting member, and the upper portion of the rod body projects outside the drain pot. The valve body can be moved up and down. Even if the rod is moved up and down at this time, the gas in the drain pipe is sealed by the liquid seal portion, so that the gas does not leak to the outside. As a result, it is possible to easily confirm that the valve body is not fixed to the valve seat and the operability of the float and the valve, and the valve body is fixed to the valve seat and does not move, so that the drain trap function is not performed. Even in such a case, by moving the valve body from the outside, the sticking of the valve body to the valve seat can be released, and the function of the drain trap can be recovered. In this way, the function of the drain trap can always be maintained, and even if the liquid level in the drain pipe is lowered, the ejection of gas can be reliably prevented. Moreover, since the structure is simple, it can be manufactured at low cost.

According to the second aspect of the present invention, the float has a float body that floats on the liquid surface in the drain pipe, and has an auxiliary float body in the drain pot, so that the buoyancy is large. Correspondingly, the weight of the float can be increased, so that the sealing performance when the valve is closed can be improved. Further, since the float can be floated substantially vertically, the valve body that moves up and down integrally with the float can be moved up and down stably. As a result, even if the liquid level in the drain pot is lowered or the pressure in the drain pipe is increased, the ejection of gas can be reliably prevented.

According to the third aspect of the present invention, the liquid-sealed drain trap further includes valve body position notifying means for notifying that the position of the valve body is lowered when the position of the valve body is below a predetermined height. Even when the valve body is fixed to the valve seat, this state can be immediately known. If it is determined that the valve body is in a low position and the valve body is firmly attached to the valve seat, the valve body is released from sticking to the valve seat by moving the valve body from the outside via the float rod. Can do. As a result, the function of the drain trap can be recovered, and even if the liquid level in the drain pipe is lowered, the ejection of gas can be reliably prevented.

According to the fourth aspect of the present invention, since the valve body position notifying means is a level switch, the position of the valve body can be reliably notified when the valve body is below a predetermined position. As a result, if it is determined that the position of the valve body is low and the valve body is firmly attached to the valve seat, the valve body is fixed to the valve seat by moving the valve body from the outside through the rod body of the float. Can be solved .

According to the fifth aspect of the present invention, the liquid-sealed drain trap is different from the liquid level in the drain pipe where the valve is closed and the height at which the valve body position notification means informs that the position of the valve body has decreased, Since the liquid level in the drain pipe where the valve is closed is lower than the height at which the valve body position notification means notifies that the position of the valve body has decreased, the liquid level in the drain pot is decreasing over time. First, the valve body position notifying means is operated, and the valve is closed after notifying the danger in advance. Since the cause of the liquid level drop can be investigated and countermeasures can be taken when the valve position notification means is activated, the function of the drain trap can be reliably maintained.

According to the sixth aspect of the present invention, the liquid-sealed drain trap includes a valve body position indicator that is visible on the upper part of the rod body of the float, so that the position of the valve body can be confirmed visually even from a distant place. be able to. Further, in the state where the valve body is operating normally, the position of the valve body indirectly indicates the liquid level in the drain pipe, so that the liquid level in the drain pipe and thus in the drain pot can be known. As a result, the sticking of the valve body can be eliminated, the liquid can be replenished to the drain pot, and the gas can be reliably prevented from being ejected.

  FIG. 1 is a diagram showing a schematic configuration of a liquid seal drain trap 15 as a first embodiment of the present invention. FIG. 2 is a view showing a state when the liquid level in the drain pot 3 of the liquid ring type drain trap 15 of FIG. 1 is lowered. FIG. 3 is a diagram showing a state when the pressure in the drain pipe 2 of the liquid seal drain trap 15 of FIG. 1 is increased. The same members as those in FIG. 8 are denoted by the same reference numerals and detailed description thereof is omitted.

  The liquid-sealed drain trap 15 is a liquid-sealed drain trap that seals the drain pipe 2 in the drain pot 3 and collects the drain while preventing the gas 7 from being ejected. The float 20, the valve 30 provided in the drain pipe 2, the valve body drive means that can move the valve body 31 that constitutes the valve 30 from the outside, and the valve body position notification means that notifies the position of the valve body 31 are mainly used. Composed.

  The drain pipe 2 is for guiding the drain from a pipe (not shown) through which the gas 7 flows to the drain pot 3, and the lower end of the drain pipe 2 is inserted into the liquid 5 in the drain pot 3. The drain pot 3 stores a liquid 5 made of drain that flows down from the drain pipe 2. The drain pot 3 creates a liquid seal portion 6 in the drain pipe 2 with the liquid 5 to be stored, and prevents the gas 7 in the drain pipe 2 from being ejected. With the above configuration, the drain pot 3 enables the recovery of the drain from the drain pipe 2 and prevents the gas 7 from being ejected.

  The drain pot 3 is provided with an overflow pipe 4 at the top. The liquid 5 stored in the drain pot 3 is discharged out of the system from the overflow pipe 4 of the drain pot 3 when the storage amount increases. As described above, the overflow pipe 4 has a function of keeping the liquid level in the drain pot 3 constant. With this, the drain pipe 2 secures a stable liquid sealing portion 6 and prevents the gas 7 from being ejected. Can do.

  The float 20 is connected to a float main body 21 that floats on the liquid 5 in the drain pipe 2, a support rod connecting member 22 that is connected via a valve rod 32 that is attached to a lower portion of the float main body 21, and a support rod connecting member 22. A support bar 23 that supports the body position display body 45 is included. Since the float 20 has the float main body 21 that floats on the liquid 5 in the drain pipe 2, the float 20 moves up and down following the liquid level in the drain pipe 2, and opens and closes the valve 30 provided in the drain pipe 2. The float body 21 is a structure that floats on the liquid 5 and can be made of a material smaller than the specific gravity of the liquid 5 such as foam or wood. Or it can be set as the ball-shaped sealed hollow body.

  The float main body 21 can be placed in the drain pot 3 instead of in the drain pipe 2 as long as the float 20 is provided only for buoyancy. However, the liquid-sealed drain trap 15 of the present invention is provided in the drain pipe 2. Since the valve 30 in the drain pipe 2 is opened and closed in accordance with the liquid level inside, the float body 21 must be provided in the drain pipe 2 without fail. However, as shown in a second embodiment to be described later, an auxiliary float body can be provided in the drain pot 3. Even in this case, it goes without saying that the main float body 21 is required in the drain pipe 2. Needless to say, the float body 21 provides buoyancy to the float 20 and must be balanced with the weight of the float 20.

  The support rod connecting member 22 is a structure that is located further below the lower end of the drain pipe 2 and connects the lower end of the valve rod 32 and the lower end of the support rod 23. The support rod connecting member 22 is a structure larger than the specific gravity of the liquid 5 in the drain pot 3 and functions as a weight for ensuring that the float 20 has a sufficient weight. By giving the support rod connecting member 22 an appropriate weight, the sealing performance when the valve 30 is closed is enhanced, and the center of gravity of the float 20 can be positioned at the lower part of the float 20. , Can move up and down stably in the drain pot 3.

  The support rod 23 is a structure that connects the support rod coupling member 22 and the valve body position indicator 45 attached in a state that is visible from the outside, and the valve body 31 via the valve rod 32 and the support rod coupling member 22. Is transmitted to the valve body position display body 45. The support bar 23 is guided by support bar guides 25 and 26 provided in two upper and lower stages in the drain pot 3. The support rod guides 25 and 26 have one end fixed to the inner wall of the drain pot 3 and the other end fixed to the outer wall of the drain pipe 2, and a guide pipe 27 that prevents the support rod 23 from tilting forward, backward, left and right in the middle portion. 28. Thereby, the stable vertical movement of the float 20 is ensured. Needless to say, the support rod guide 25 needs to be mounted at a position that does not hinder the vertical movement of the float 20, but it is considered that the float 20 moves up and down somewhat due to pressure fluctuations in the drain pipe 2. There is a need. Further, the support rod 23 functions as a valve body driving means that can move the valve body 31 from the outside of the drain pipe 2. Since the upper portion of the support rod 23 is located outside the drain pot 3, when the liquid seal drain trap 15 is inspected, the support rod 23 is moved up and down by hand to confirm the operability of the float 20 and 30 sticking can be eliminated.

  The valve 30 is provided in the donle pipe 2, and the valve seat 33 is fixed to the inner wall of the lower end portion of the drain pipe 2. The valve body 31 is fixed to the lower part of the float body 21 and the upper part of the valve rod 32. The lower part of the valve body 31 has an end plate shape and is closed by pressing the valve body 31 against the valve seat 33. In order to improve the sealing performance when the valve 30 is closed, it is necessary to increase the pressure at the contact portion between the valve body 31 and the valve seat 33. For this purpose, it is necessary that the weight of the float 20 is sufficient to ensure sealing performance. This weight may be secured by the support bar connecting member 22 or a weight may be attached to the support bar connecting member 22 as necessary. Since the valve rod 32 is connected to the support rod connecting member 22 constituting the float 20, the valve body 31 moves up and down integrally with the float 20, and when the liquid level in the drain pipe 2 decreases, the valve 30 is closed and the liquid level is reduced. Is high, the valve 30 is opened.

  The valve 30 needs to be provided in the drain pipe 2, but the mounting position is not particularly limited, and prevents the gas 7 from being ejected from the drain pipe 2 when the liquid level in the drain pipe 2 is lowered. I can do it. Thus, when the liquid level in the drain pipe 2 is lowered, the valve 30 closes in conjunction with the float 20 and prevents the gas 7 from being ejected from the drain pipe 2. It is necessary to close completely before the liquid seal of the liquid seal part 6 is broken. Moreover, since the attachment method of the valve seat 33 fixed in the drain pipe 2 is not specifically limited, the valve seat 33 may be attached to a short pipe, and this short pipe may be attached to the drain pipe 2 via a flange. In this case, the short pipe functions as a part of the drain pipe 2. The provision of the valve 30 in the drain pipe 2 as described above is not only when the valve 30 is directly attached to the drain pipe 2 but also when the short pipe with the valve seat 33 attached to the existing drain pipe 2 is attached. Including. Further, the valve body 31 and the float main body 21 do not necessarily have to be attached as shown in the second embodiment. Needless to say, the tip of the float body 21 needs to be in a position that does not come into contact with the stop valve 10. However, the liquid level in the drain pipe 2 also moves up and down somewhat as the pressure in the drain pipe 2 fluctuates. It is necessary to consider that.

  A level switch 40 for notifying the position of the valve body 31 is attached to the upper end of the drain pot 3. Further, a valve body position display body 45 for displaying the position of the valve body 31 is provided on the support rod 23. The level switch 40 is energized when pressed, and notifies that the valve body 31 is below a predetermined position. A rod-like body 46 for depressing the level switch 40 is attached to the side of the valve body position display body 45, and the liquid level in the drain pipe 2 is lowered and integrated with the float 20 following this. When the valve body 31 that moves up and down is below a predetermined position, the rod-shaped body 46 presses the level switch 40. As a result, it is possible to notify that the position of the valve body 31 has been lowered, that is, the abnormality of the liquid seal drain trap 15 in a place where a person resides such as an operation room.

  The fact that the float 20 is below the predetermined position is not limited to when the liquid level in the drain pipe 2 is lowered. Even if the liquid level in the drain pipe 2 is normal, the position of the float 20 that moves up and down integrally with the valve body 31 is lowered when the valve body 31 is fixed to the valve seat 33. For this reason, it is also possible to know that the valve body 31 is fixed to the valve seat 33 via the level switch 40. The type of the level switch 40 is not particularly limited, and may be a magnetic or optical level switch. Further, the rod-like body 46 for pressing the level switch 40 may move up and down integrally with the float 20, and is not necessarily attached to the valve body position display body 45.

  The valve body position display body 45 is another valve body position notification means, and is installed on the support rod 23 and outside the drain pot 3. The valve body position display body 45 has a plate-like shape or a rod-like shape, and a decrease in the position of the valve body 31 can be visually recognized even from a distant place. The valve body position display body 45 is a direct valve body position notifying means, and since it moves integrally with the float 20, it is highly reliable and can be visually confirmed in the field. Cause investigation and countermeasures can be taken.

  The liquid-sealed drain trap 15 having the above configuration ensures that the gas 7 is ejected from the drain pipe 2 even if the liquid level in the drain pot 3 is lowered or the pressure in the drain pipe 2 is increased. Can be prevented. The liquid 5 stored in the drain pot 3 normally maintains a constant amount, but may decrease due to evaporation or damage to the drain pot 3. As shown in FIG. 2, when the storage amount of the liquid 5 is reduced, the liquid level in the drain pot 3 is lowered, and the liquid level in the drain pipe 2 is also lowered accordingly. At this time, in the conventional liquid seal drain trap 1 shown in FIG. 8, the liquid seal of the liquid seal portion 6 is broken and the gas 7 in the drain pipe 2 is ejected to the outside through the drain pot 3.

  On the other hand, in the liquid-sealed drain trap 15 shown in the present embodiment, when the float 20 having the float body 21 floats on the liquid surface 9 in the drain pipe 2 and the liquid level in the drain pipe 2 decreases, Follow this to descend. Further, the valve 30 provided in the drain pipe 2 connects the valve rod 32 to the support rod connecting member 22 of the float 20, so that the liquid level in the drain pot 3 is lowered and the liquid level in the drain pipe 2 is a predetermined level. When the height is less than or equal to the height, the valve body 31 is pressed against the valve seat 33 and the valve 30 is closed. Thereby, even if the liquid level in the drain pot 3 falls, the ejection of the gas 7 from the drain pipe 2 can be prevented. When the cause of the lowering of the liquid level in the drain pot 3 is removed, and the liquid is supplied to the drain pot 3 and the liquid level in the drain pot 3 returns to a normal height, the liquid sealing portion 6 of the drain pipe 2 is again The gas 7 is prevented from being ejected. At the same time, the float 20 rises to a normal position, the valve 30 is opened again via the valve rod 32 connected to the float 20, and the drain normally flows down from the drain pipe 2.

  On the other hand, as shown in FIG. 3, even if the liquid level in the drain pot 3 is normal, if the pressure in the drain pipe 2 increases, the liquid level in the drain pipe 2 increases as the pressure in the drain pipe 2 increases. Decreases. Also in this case, the valve 30 is closed to prevent the gas 7 from being ejected, as in the case where the liquid level in the drain pot 3 is lowered. When the pressure in the drain pipe 2 is restored to the normal pressure, the liquid seal portion 6 of the drain pipe 2 is secured again, and the valve body 31 that moves up and down integrally with the float 20 is raised to a normal position. The drain is recovered while preventing the gas 7 from being ejected.

  Moreover, since the liquid seal drain trap 15 shown in this embodiment has the support rod 23 which can move the valve body 31 from the outside, when inspecting the liquid seal drain trap 15, the support rod 23 is manually held. By making it move up and down, it is possible to easily confirm the prevention of sticking and operability of the valve body 31. Further, when the valve body 31 is fixed to the valve seat 33, the fixation can be released. This is a function that the conventional liquid-sealed drain trap 1 does not have, so that the ejection of the gas 7 can be reliably prevented. Further, since the level switch 40 for notifying the position of the valve body 31 and the valve body position display body 45 are provided, even when the valve body 31 is fixed to the valve seat 33, this state can be immediately known. If it is determined that the position of the valve body 31 is low and the valve body 31 is fixed to the valve seat 33, the valve body 31 is moved from the outside via the support rod 23, thereby moving the valve body 31 to the valve seat 33. Can be fixed. Further, when the valve body 31 is operating normally via the level switch 40 and the valve body position display body 45, the liquid level in the level pipe 2 and the pressure in the level pipe 2 are normal pressures. In this case, the liquid level in the drain pot 3 can be indirectly known.

  FIG. 4 is a diagram showing a schematic configuration of a liquid ring type drain trap 50 as a second embodiment of the present invention. FIG. 5 is an AA arrow view of the liquid seal drain trap 50 of FIG. FIG. 6 is a view showing a state in which the pressure in the drain pipe 2 of the liquid ring type drain trap 50 of FIG. 4 is increased. FIG. 7 is a view showing a state in which the liquid level in the drain pot 3 of the liquid ring type drain trap 50 of FIG. 4 is lowered. The same members as those in FIGS. 1 to 3 and FIG.

  The liquid-sealed drain trap 50 shown in the second embodiment has the same basic configuration as the liquid-sealed drain trap 15 shown in the first embodiment, but the structure of the float 60 is different. In the liquid-sealed drain trap 15 including the valve 30 that closes by pressing the valve body 31 against the valve seat 33 as shown in the first embodiment, in order to improve the sealing performance of the valve 30, the valve body 31 and the valve seat As described above, it is necessary to increase the pressure of the contact portion with 33. In order to increase the pressure at the contact portion between the valve body 31 and the valve seat 33, it is simple and efficient to increase the weight of the valve body 31. For this purpose, it is necessary to increase the weight of the float 20 connected via the valve stem 32. However, if the weight of the float 20 is increased, the size of the float body 21 is correspondingly increased and the buoyancy is increased. There is a need.

  In the liquid-sealed drain trap 15 shown in the first embodiment, when the diameter of the drain pipe 2 is small, the size of the float main body 21 cannot be made sufficiently large. Limited. The liquid-sealed drain trap 50 shown in the second embodiment increases the weight of the float and increases the pressure at the contact portion between the valve body 31 and the valve seat 33 even when the diameter of the drain pipe 2 is small. Is characterized in that the auxiliary float body 61 is provided in the drain pot 3.

  The float 60 is attached to the float main body 21 floating on the liquid level 9 in the drain pipe 2, the auxiliary float main body 61 (61 a, 61 b, 61 c) floating on the liquid level 8 in the drain pot 3, and the lower part of the auxiliary float main body 61. A support rod 23 (23a, 23b, 23c), a connecting body 29 (29a, 29b, 29c) for connecting the lower portion of the support rod 23 and the lower portion of the valve rod 32 of the valve 30, and a support rod mounting plate 24 (24a, 24b, 24c). The float body 21 floats on the liquid level 9 in the drain pipe 2 and moves the float 60 up and down following the change in the liquid level. When the float 60 descends following the liquid level, the valve stem 32 also descends, and the valve body 31 attached to the valve stem 32 is pressed against the valve seat 33 fixed in the drain pipe 2 to close the valve 30. . Thereby, the ejection of the gas 7 due to the liquid level drop is prevented. The valve 30 needs to be completely closed before the liquid seal of the liquid seal portion 6 in the drain pipe 2 is broken, as in the liquid seal drain trap 15 shown in the first embodiment. Needless to say, the tips of the valve body 31 and the valve rod 32 need not be in contact with the stop valve 10, but the liquid level in the drain pipe 2 also changes with the pressure fluctuation in the drain pipe 2. It is necessary to consider moving up and down somewhat.

  Three auxiliary float bodies 61 are installed at symmetrical positions around the drain pipe 2 in order to give the float 60 sufficient buoyancy and to move the float 60 up and down stably while maintaining almost horizontal in the drain pot 3. Has been. The three auxiliary float bodies 61a, 61b, 61c are connected to the support bars 23a, 23b, 23c, respectively, and the three support bars 23 are connected at one end to the support bar mounting plates 24a, 24b, 24c, respectively. Each support bar 23 is guided by support bar guides 25 (25a, 25b, 25c) and 26 (26a, 26b, 26c) provided in two stages in the drain pot 3. The support rod guides 25 and 26 have one end fixed to the inner wall of the drain pot 3, the other end fixed to the outer wall of the drain pipe 2, and a guide pipe 27 (27a not shown, 27b, 27c), 28 (28a not shown, 28b, 28c). Thereby, the stable vertical movement of the float 60 is ensured. It should be noted that when the support rod guide 25 is attached, it is necessary to attach the support rod guide 25 at a position that does not prevent the float 60 from moving up and down in consideration of the fact that the float 60 slightly moves up and down with the pressure fluctuation in the drain pipe 2. This is the same as the liquid seal drain trap 15 shown in the first embodiment.

  The support bar mounting plate 24 is an elongated plate-like body, and is connected to the support bar 23 and the ends thereof are connected to each other. As a result, the support bar mounting plate 24 has a triangular shape in plan view. Furthermore, the support rod mounting plate 24 has a connection body 29 (29a, 29b, 29c) that is connected to the lower end of the valve rod 32 at the center. Accordingly, when the liquid level in the drain pipe 2 changes, the valve rod 32 connected to the float 60 also moves up and down integrally with the float 60. In the second embodiment, an example in which three auxiliary float bodies 61 are installed has been shown, but one or a plurality of auxiliary float bodies 61 may be installed depending on the situation. However, it is preferable to install three or more auxiliary float bodies 61 from the viewpoint of smoothly moving the valve body 31 attached to the valve rod 32 up and down.

  The operation of the liquid ring drain trap 50 configured as described above is basically the same as that of the liquid ring drain trap 15 shown in the first embodiment. As shown in FIG. 6, when the liquid level in the drain pot 3 is normal and the pressure in the drain pipe 2 increases, only the liquid level in the drain pipe 2 decreases. Along with this, the position of the float main body 21 floating on the liquid surface 9 in the drain pipe 2 is also lowered. On the other hand, the auxiliary float body 61 is normally floating on the liquid surface 8 in the drain pot 3, but sinks in the liquid when the position of the float body 21 is lowered, and the float 60 lowers the position as a whole. When the float 60 falls below a predetermined position, the valve body 31 is pressed against the valve seat 33 to prevent the gas 7 from being ejected from the drain pipe 2. If the pressure in the drain pipe 2 is restored to a normal pressure, the liquid level in the drain pipe 2 also returns to a normal height. Thereby, although the valve 30 is opened, the liquid sealing portion 6 is secured, so that the drain can be collected while preventing the gas 7 from being ejected.

  On the other hand, when the liquid level in the drain pot 3 is lowered as shown in FIG. 7, the liquid level in the drain pipe 2 is lowered as the liquid level in the drain pot 3 is lowered. Reduce. At this time, both the float main body 21 and the auxiliary float main body 61 are floated on the liquid surface. When the float 60 falls below a predetermined position, the valve body 31 is pressed against the valve seat 33 to prevent the gas 7 from being ejected from the drain pipe 2. If the liquid level in the drain pot 3 is restored to the normal height, the liquid level in the drain pipe 2 also returns to the normal height. Thereby, although the valve 30 is opened, the liquid sealing portion 6 is secured, so that the drain can be collected while preventing the gas 7 from being ejected.

  In the liquid-sealed drain trap 50 shown in the second embodiment, when the pressure in the drain pipe 2 increases, the float body 21 floats on the liquid surface 9 in the drain pipe 2 as described above, while the auxiliary float body 61 Sink in the liquid. For this reason, if the buoyancy of the auxiliary float body 61 is excessive, the float 60 floats on the liquid surface 8 in the drain pot 3 even if the liquid level in the drain pipe 2 decreases, and the valve 30 does not close. For this reason, the buoyancy of the auxiliary float body 61 and the buoyancy of the float body 21 need to be set in consideration of the balance with the weight of the float 60.

  Similarly to the liquid seal type drain trap 15 shown in the first embodiment, the liquid seal type drain trap 50 shown in the second embodiment also includes a level switch 40 for informing the position of the valve element 31, a valve element position indicator 45, and the valve element 31. Since the support rod 23 that can be moved from the outside of the drain pot 3 is provided, even when the valve body 31 is fixed to the valve seat 33, this can be easily detected and dealt with. The level switch 40 of the liquid seal drain trap 50 shown in the second embodiment is reverse in operation to the level switch 40 of the liquid seal drain trap 15 shown in the first embodiment. Thus, although the operation of the level switch 40 can be turned on or off when the position of the valve body 31 is lowered, the position of the valve body 31 also moves up and down somewhat with the pressure fluctuation in the drain pipe 2. In consideration, it is preferable to turn on when the position of the valve body 31 is lowered.

It is a figure which shows schematic structure of the liquid seal type drain trap 15 as 1st embodiment of this invention. It is a figure which shows a state when the liquid level in the drain pot 3 of the liquid seal type drain trap 15 of FIG. 1 falls. It is a figure which shows a state when the pressure in the drain pipe 2 of the liquid seal type drain trap 15 of FIG. 1 rises. It is a figure which shows schematic structure of the liquid seal type drain trap 50 as 2nd embodiment of this invention. It is an AA arrow line view of the liquid seal type drain trap 50 of FIG. It is a figure which shows a state when the pressure in the drain pipe 2 of the liquid seal type drain trap 50 of FIG. 4 rises. It is a figure which shows a state when the liquid level in the drain pot 3 of the liquid seal type drain trap 50 of FIG. 4 falls. It is a figure which shows schematic structure of the conventional liquid seal type drain trap.

Explanation of symbols

2 Drain pipe 3 Drain pot 7 Gas 8 Liquid level in the drain pot 9 Liquid level in the drain pipe 15 Liquid-sealed drain trap 20 Float 21 Float body 23 Support rod 30 Valve 31 Valve body 33 Valve seat 40 Level switch 45 Valve body position Display 50 Liquid-sealed drain trap 60 Float 61 Auxiliary float body

Claims (6)

In a liquid-sealed drain trap that recovers drain while liquid-sealing the drain pipe in the drain pot and preventing gas ejection,
Float body floats in the drain pipe, rod upper located in the drain pipe outside is protruded to the outside of the drain pot, located further down than the lower end of the drain pipe lower end and the lower end of the rod of the valve stem A float that moves up and down following the liquid level in the drain pipe, comprising a coupling material to be coupled;
The valve body includes a fixed seat in the drain pipe, the the liquid level of the drain pipe is below a predetermined height valve body connected with the float up and down as the float integrally via the valve stem the includes, and against closing valve press the valve seat,
The liquid seal drain trap, wherein the valve body can be moved up and down by moving the rod up and down . The liquid-sealed drain trap according to claim 1 , wherein the float further has an auxiliary float body that floats on a liquid surface in the drain pot. The liquid seal drain trap according to claim 1 or 2 , further comprising valve body position notifying means for notifying that the position of the valve body is lowered when the position of the valve body is below a predetermined height. . 4. The liquid seal type drain trap according to claim 3 , wherein the valve element position notifying means is a level switch. Unlike the liquid level in the drain pipe that closes the valve and the height that the valve body position notification means notifies that the position of the valve body has dropped, the liquid level in the drain pipe that closes the valve The liquid-sealed drain trap according to claim 3 or 4 , wherein the position notifying means is lower than a height for notifying that the position of the valve body has been lowered. The liquid-sealed drain trap according to any one of claims 1 to 5, further comprising a valve body position indicator that is visible at an upper portion of the rod body .

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