JP2005083688A - Water supply control device of drain recovering tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control a water supply quantity to a drain recovering tank by a mechanical means. <P>SOLUTION: A water supply tank 13 is connected to the drain recovering tank 1 interposed between a drain recovering pipe 3 and a boiler water supply pipe 4, via a check valve 14 for preventing a backflow to the water supply tank 13 side. A water supply pipe 15 is connected to the water supply tank 13. A float valve 16 for arranging a float 16c in the water supply tank 13, is arranged in the water supply pipe 15, and the water supply quantity from the water supply pipe 15 when the inside of the drain recovering tank 1 lowers to a preset water level or less, is controlled by the float valve 16 arranged in the water supply tank 13. Since water does not flow backward to the water supply tank 13 from the drain recovering tank 1 by the check valve 14, even if the inside of the drain recovering tank 1 becomes the preset water level or more, the water supply tank 13 does not rise more than the preset water level, to check damage and failure of the float valve 16 by an excessive water level rise. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a water supply control device for a drain recovery tank that supplies water to a set water level when the amount of recovered drain is small.

Conventionally, in the steam pipe system, the drain obtained by condensing the effectively used steam is hot water close to 100 ° C, so this drain is recovered and reused in the boiler, and the boiler's energy consumption and boiler water use The amount is reduced.
The drain is once stored in the drain recovery tank and supplied to the boiler, but the drain recovery amount also varies depending on the load of the steam pipe system.
Accordingly, a water supply control device is usually provided to keep the amount of water stored in the drain recovery tank at least at a set value.
As shown in FIG. 3, this apparatus is installed in a drain recovery tank c interposed between a drain recovery pipe a and a boiler water supply pipe b, and floats up and down according to the elevation of the water level in the drain recovery tank c. It mainly comprises a float switch e that opens and closes contacts by d, and an electromagnetic valve g that is connected to the float switch e via a control panel f and opens and closes by opening and closing the contacts.
When the amount of drain inflow is small and the amount of stored water is less than the set water level of the drain recovery tank, the float switch e detects the displacement of the float d due to the water level drop, and an electromagnetic signal is generated from the electrical signal from the float switch e. The valve g is opened, and water is supplied into the drain recovery tank c from a water supply pipe h to which the electromagnetic valve g is attached, so that the amount of stored water is maintained at a set water level.

We do not conduct prior art searches at the research and development stage or application stage, and do not know the prior art documents to be described.

However, in the above apparatus, since the water level in the drain recovery tank c is electrically controlled, in the unlikely event that the piping system around the drain recovery tank c is damaged and water leaks, the water leaks to the control panel f.
A fire and other accidents are incurred due to leakage of electricity due to contact with etc.
In order to prevent such a situation from occurring, it is conceivable that the water level of the drain recovery tank c is controlled by a mechanical float valve instead of the electrical control as described above. In order to recover the drain without waste, the drain recovery tank has sufficient capacity to recover the drain above the set water level. When a float valve is installed in the drain recovery tank, if a large amount of drain is collected so that it exceeds the upper limit position of the insulator bowl that supports the float, the float will be submerged, but the float will be submerged and its buoyancy will cause To try to rise more,
The insulator bowl was deformed and damaged, and the float valve failed, so that it was not possible to install the float valve in the drain recovery tank c.

In view of the above problems, the present invention connects a water supply tank to a drain recovery tank interposed between a drain recovery pipe and a boiler water supply pipe via a check valve that prevents backflow to the water supply tank side, A water supply pipe is connected to the water supply tank, and the water supply pipe is provided with a water supply control device for the drain recovery tank provided with a float valve arranged in the water supply tank. The drain recovery tank falls below the set water level. The above problem is solved by controlling the amount of water supplied from the water supply pipe at a time by a float valve provided in the water supply tank.
In addition, the water supply tank may be installed so that the vertical position relative to the drain recovery tank can be adjusted. In this case, the water supply tank can be freely attached to and detached from a plurality of mounting portions set at predetermined intervals in the height direction of the drain recovery tank. It is better to provide.

In short, the invention according to claim 1 connects a water supply tank to a drain recovery tank interposed between a drain recovery pipe and a boiler water supply pipe via a check valve that prevents a back flow to the water supply tank side, A water supply pipe is connected to the water supply tank, and the water supply pipe is provided with a float valve in which a float is arranged in the water supply tank. Therefore, if the storage amount of the drain recovery tank falls below the set water level, the water supply tank The float valve is opened by the float that falls according to the water level, and water is supplied from the water supply pipe into the water supply tank, and the drain recovery tank can be held at the set water level through the water supply tank.
Even if a large amount of drain flows into the drain recovery tank and the water level rises above the set value, the check valve does not flow back from the drain recovery tank to the water supply tank, so the inside of the water supply tank rises from the set water level. Therefore, the float valve can be prevented from being damaged or broken due to an excessive rise in the water level, the set water level of the water supply tank can be stably maintained, the drain can be recovered in the drain recovery tank without waste, and supplied to the boiler.
Therefore, according to the present invention, even if mechanical control using a float valve is performed, the float valve can be operated normally without malfunctioning, and the water level of the drain recovery tank can be controlled regardless of conventional electrical control. Since the amount of water supplied from the water supply pipe when the drain recovery tank falls below the set water level can be controlled by the float valve provided in the water supply tank, there is no danger of leakage due to water leakage around the boiler.

In the invention according to claim 2, since the water supply tank is installed so that the vertical position relative to the drain recovery tank can be adjusted, the set water level of the drain recovery tank is changed depending on the height of the water supply tank relative to the drain recovery tank, that is, the water supply tank is The set water level of the drain recovery tank can be set upward as it is installed at the lower position, and the set water level of the drain recovery tank can be set downward as it is installed at the lower side.
Therefore, the set water level can be adjusted according to other conditions such as the capacity of the drain recovery tank,
For example, once the water supply tank is temporarily installed at a predetermined height position and tested, if there is any inconvenience in the set water level of the drain recovery tank, the installation height of the water supply tank can be adjusted to an appropriate set water level. Optimal use can be realized.

In the invention described in claim 3, since the water supply tank is detachably provided at a plurality of attachment portions set at predetermined intervals in the height direction of the drain recovery tank, the height adjustment or installation of the water supply tank with respect to the drain recovery tank is performed. Can be done easily.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a drain recovery tank 1 equipped in a steam pipe system, and the drain pipe recovery tank 1 includes
A water supply control device 2 is provided.
The drain recovery tank 1 is interposed between a drain recovery pipe 3 for recovering drain obtained by condensing steam effectively used in the steam pipe system, and a boiler water supply pipe 4 connected to a boiler (not shown). Yes.
The drain recovery pipe 3 is connected to the upper side of the drain recovery tank 1, and a stop valve 5 is interposed in the vicinity of the connection location.
The boiler water supply pipe 4 is connected to the lower end of the drain recovery tank 1, and includes a check valve 6, a stop valve 7 and a boiler water supply pump 8 for preventing back flow from the upstream side to the drain recovery tank 1 side.
Is intervening.
Also, a drain pipe 9 for discharging boiler water is connected to the lower end of the drain recovery tank 1 via a stop valve 10, and an overflow pipe 11 is connected to the upper end of the drain recovery tank 1 via a stop valve 12. Connected.

The water supply control device 2 includes a check valve 14 that prevents a backflow of the drain recovery tank 1 toward the water supply tank 13.
A water supply tank 13 is connected to the water supply tank 13, and a water supply pipe 15 is connected to the water supply tank 13. The water supply pipe 15 is provided with a float valve 16 having a float 16 c disposed in the water supply tank 13.
The water supply tank 13 is fixed adjacent to the drain recovery tank 1 at a predetermined height by welding or the like, and is connected from the lower end side of the water supply tank 13 to the lower side of the drain recovery tank 1 by a communication pipe 17 having a check valve 14 interposed. Has been.
The float valve 16 is attached to a water supply pipe 15 having its main body 16a connected to the water supply tank 13, and the main body 16
In a, an insulator rod 16b for opening and closing a valve body (not shown) provided therein is formed to extend downward inwardly into the water supply tank 13, and at the tip of the insulator rod 16b on the water storage surface. Floated float 16c
The float 16c moves up and down as the water level in the water supply tank 13 rises and falls to automatically stop water supply and water supply, and keep the water supply tank 13 at a preset water level.

In the present embodiment, the water supply tank 13 is fixed adjacent to the drain recovery tank 1 at a predetermined height position, but the water supply tank 13 is spaced at a predetermined interval in the height direction of the drain recovery tank 1. The plurality of mounting portions 18 set in the above manner may be detachably provided, and the vertical position of the water supply tank 13 with respect to the drain recovery tank 1 may be installed so as to be adjustable.
In this way, the set water level of the drain recovery tank 1 can be changed to a desired position according to the height position of the water supply tank 13 with respect to the drain recovery tank 1.
As shown in FIG. 2, brackets 19 that are long in the vertical direction are provided on the left and right edges of the side wall 1a for attaching the water supply tank 13 in the drain recovery tank 1, and the bracket 19 has a predetermined interval in the vertical direction. A mounting portion 18 including a plurality of bolt insertion holes 18 is provided.
On the other hand, in the water supply tank 13, a bracket 20 provided with bolt insertion holes is also provided on the left and right edges of the side wall in contact with the side wall 1a.
Then, both brackets are fastened by a fastening member 21 made of bolts and nuts so that the bolt insertion holes of the bracket 20 provided in the water supply tank 13 correspond to the mounting portions (bolt insertion holes) 18 at the desired height position.
By fastening 19 and 20, the water supply tank 13 is fixed to the drain recovery tank 1 at a predetermined height position.
When the water supply tank 13 is installed in the drain recovery tank 1, the water supply tank 13 is temporarily installed so as to correspond to the selected mounting portion 18, and the water supply tank 13 is connected by a communication pipe 17 with a check valve 14 interposed. When connected to the drain recovery tank 1 and then after a test operation, there is a problem with the set water level of the drain recovery tank 1, it is desirable to change the height position of the water supply tank 13 upward or downward. .

Next, the operation of the water supply control device 2 will be described.
The drain obtained by condensing the steam effectively used in the steam pipe system flows into the drain recovery tank 1 through the drain recovery pipe 3, and this drained drain is temporarily stored in the drain recovery tank 1 as boiler water, Water is supplied to the boiler by operating the pump 8.
When the amount of drain inflow into the drain recovery tank 1 is small due to the load of the steam pipe system and the amount of water stored in the drain recovery tank 1 is less than the set water level, cold water is replenished from the water supply tank 13 through the communication pipe 17. By replenishment, the water level in the water supply tank 13 falls below the set value.
With the lowered water level, the float 16c also descends, whereby the insulator rod 16b swings downward to open the valve body, so that water is automatically supplied from the water supply pipe 15 into the water supply tank 13.
With this water supply, when the amount of water stored in the drain recovery tank 1 reaches its set value and the float 16c rises to the set water level of the water supply tank 13, the insulator rod 16b is restored and the valve body is closed automatically. Water supply from the water supply pipe 15 stops.
Also, even if a large amount of drain flows into the drain recovery tank 1 and the water level rises above the set value, a check valve 15 provided in the communication pipe 17 connecting the drain recovery tank 1 and the water supply tank 13. Thus, the back flow from the drain recovery tank 1 to the water supply tank 13 is prevented, so that the inside of the water supply tank 13 does not rise above the set water level.
In addition, when the inside of the drain recovery tank 1 becomes full or more, a part of boiler water flows out from the overflow pipe 11 to the outside.

It is a simplified diagram showing a drain recovery tank provided with a water supply control device. It is a perspective view of the drain collection tank which can adjust the attachment position of a water supply tank up and down. It is a simplified diagram showing the prior art.

Explanation of symbols

1 Drain recovery tank 3 Drain recovery pipe 4 Boiler water supply pipe
13 Water tank
14 Check valve
15 Water supply pipe
16 Float valve
16c float
18 Mounting part

Claims (3)

A water supply tank is connected to a drain recovery tank interposed between the drain recovery pipe and the boiler water supply pipe via a check valve that prevents backflow to the water supply tank, and a water supply pipe is connected to the water supply tank. In addition, a water supply control device for a drain recovery tank, wherein the water supply pipe is provided with a float valve in which a float is arranged in the water supply tank. 2. The water supply control device for a drain recovery tank according to claim 1, wherein the water supply tank is installed so that its vertical position relative to the drain recovery tank is adjustable. The water supply control device for a drain recovery tank according to claim 2, wherein the water supply tank is detachably provided at a plurality of attachment portions set at predetermined intervals in the height direction of the drain recovery tank.

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