JP3177007U - Water level adjuster for flush water tank for flush toilet - Google Patents

Abstract

[PROBLEMS] To provide a simple structure, which can be installed in a flush water tank for a flush toilet, which is already installed, does not require cost for readjustment of the quantity of flush water after installation, and is durable. A water level control device for a flush toilet is provided.
A cleaning water tank water level adjusting device has a plug that closes a water passage, and a water level adjusting floating ball connected to the stopper by a water level adjusting chain. When the stopper is released from the water passage by the operation lever 13, the wash water is discharged to the toilet bowl, and the level of the wash water is lowered and the water level reaches the water level control floating ball. When the water level of the washing water drops and reaches the water level adjustment floating ball, the water level adjustment device is lowered and the plug closes the water passage to the toilet.
[Selection] Figure 2

Description

  The present invention relates to a water level adjusting device for a flush water tank for a flush toilet used to conserve water. More specifically, the present invention relates to a water level adjusting device for a washing water tank that adjusts the water level immediately after toilet flushing, in the washing water tank that stores washing water for washing the flush toilet.

  As a flush toilet that saves the amount of washing water for washing in the toilet bowl, the toilet bowl structure is improved so that the toilet bowl can be satisfactorily washed even if the quantity of wash water supplied to the toilet bowl fluctuates. What was made (for example, Patent Document 1), the structure of the washing water tank for storing washing water for washing the toilet bowl was improved, the amount and strength of the washing water supplied to the toilet bowl was adjusted, and water was saved as a result (For example, Patent Documents 2 to 5).

Among these, there are the following devices that can adjust the amount of washing water supplied to the latter toilet and thereby save water.
That is, Patent Document 2 describes an apparatus that provides a valve opening delay mechanism to reduce the amount of water supplied while the drain valve is open.
Patent Literature 3 describes a washing water tank device that includes a washing switching cup to save water, and Patent Literature 4 describes a device that electrically controls the amount of washing water.
Further, Patent Document 5 describes a washing water tank device that can save water by supplying a strong aqueous washing water to the toilet from the start of drainage to the end of drainage.

  However, the conventional “method for adjusting the amount of washing water” as described above is complicated as a device, and is a device that should be provided in a toilet before shipping by the toilet manufacturer. It is almost impossible to provide additional washing water tanks for flush toilets installed in the facility at a later time, or vice versa to provide additional washing water tanks later. It was expensive.

As an extremely simple method that can be added later to a washing water tank for an existing flush toilet, there is a method in which a plastic bottle or brick containing water is submerged in the washing water tank.
However, with these methods, PET bottles and bricks may fall over due to the flow of water, making it impossible to adjust the amount of water, or damaging the polystyrene foam attached to the side of the washing water tank to prevent freezing. There was a case.
In addition, if there are many toilets that you want to adjust the amount of washing water frequently at accommodation facilities, etc., you must prepare a large number of plastic bottles and bricks of different sizes. there were.
Moreover, although it is necessary to always keep the cleaning water clean, bacteria are likely to propagate in the cleaning water tank, and slippage is likely to occur. However, there has been a problem in that a submerged plastic bottle or brick increases the surface area in the washing water tank and widens the area (area) where bacteria propagate.

  The demand for water saving has been increasing, and such known technology is insufficient and further improvement has been demanded.

JP 2012-041793 A Japanese Utility Model Publication No. 07-015866 JP 2007-197985 A JP 2010-209552 A JP 2011-241554 A

  The present invention has been made in view of the above-mentioned background art, and the problem is that the structure is simple and can be installed in the field with respect to the flush water tank for the flush toilet already installed. It is another object of the present invention to provide a water level adjusting device for a washing water tank of a flush toilet that is not costly for readjustment of the amount of washing water.

As a result of intensive studies to solve the above-mentioned problems, the present inventor found that the water level in the washing water tank is such that the stopper closes the water passage when the washing water level drops below a certain level. It has been found that by providing a water level adjustment device having an adjustment float, all of the wash water in the wash water tank is prevented from being discharged into the toilet, and as a result, water can be saved.
That is, when the water level of the washing water drops below the water level adjustment float, the water level adjustment float connected to the water level adjustment device loses its buoyancy, so that the entire water level adjustment device moves down and the wash water The present invention was completed by finding that water was saved by the plug closing the water passage before all the water in the tank was discharged to the toilet.

That is, the present invention is a water level adjusting device that adjusts the water level immediately after cleaning the toilet bowl in the cleaning water tank for storing the cleaning water for cleaning the flush toilet,
The washing water tank has a chain raising arm and an arm connecting chain adapted to pull up the water level adjusting device and the stopper device by operating an operation lever after using the toilet, A float designed to replenish wash water to the wash water tank when the wash water level in the wash water tank is lowered from the full level when it is discharged to the toilet from the water channel opened at the bottom of the wash water tank. Has a valve system,
The water level adjusting device has a plug that closes the water passage, and a water level adjustment floating ball that is connected to the stopper by a water level adjusting chain. The water is released by the buoyancy until the water level reaches the water level control float, and the water level is maintained by the buoyancy. When the water level adjustment buoy ball is lowered and the buoyancy due to the water level adjustment buoy ball is lost, the water level adjustment device is lowered, and the stopper of the water level adjustment device blocks the water passage to the toilet. A water level adjusting device is provided.

The present invention also provides a flush water tank for a flush toilet characterized by comprising the above water level adjusting device.
Moreover, this invention provides the flush toilet characterized by providing said water level adjustment apparatus in the washing water tank.

According to the present invention, the above-mentioned problems and the above-mentioned problems are solved, and the apparatus is very simple as an apparatus, and is a washing water tank for an existing flush toilet already fixedly installed in a home, an accommodation facility, a public toilet or the like. It is possible to save water with almost one touch.
That is, when the wash water in the wash water tank is discharged to the toilet and the water level of the wash water is lowered, the water level at the time when the plug closes the water passage is adjusted to a high level and to any position very easily. be able to.

  Since the water level adjusting device of the present invention has a simple structure, there is no cost for manufacturing the water level adjusting device and installing it inside the washing water tank. Therefore, the water level control device of the present invention is very suitable for those who are trying to save water charges by saving water.

In a place where a flush toilet is already installed, it is possible to adjust and reduce the amount of flush water discharged to the toilet very easily without removing the flush toilet. Also, adjustment is as easy as a professional operator or a regular user of a toilet.
There are many flush toilets installed in lodging facilities such as large hotels and public toilets, etc., so there are a lot of them, so even if you can adjust the amount of flush water in all flush toilets even if you can work on site Usually, it takes a very long time, but according to the present invention, the time required for adjusting one flush toilet can be shortened. For example, one worker can adjust the amount of water in all toilets in a short time.

In addition, as described above, the water level control device of the present invention does not cost to manufacture and install, but not only to it, it also does not cost to fine-tune the amount of washing water discharged to the toilet after installation, It also saves the running cost of the device, such as maintenance and water volume adjustment after installing the water level control device of the present invention.
Furthermore, the water level adjusting device of the present invention is durable because it is simple as a device, and hardly needs to be replaced until the time of replacement of the flush toilet or the flush water tank.

As an extremely simple method that can be added later to the existing wash water tank for flush toilets, there is a method in which a plastic bottle or brick containing water is submerged in the wash water tank. As described above, there are various drawbacks and problems. According to the present invention, all of them can be solved.
That is, there is no case where the PET bottle or the brick collapses due to the momentum of the flowing water, the adjustment of the water amount becomes ineffective, or the side surface of the washing water tank is damaged.
In addition, when there are many toilets, etc., it is costly for toilet managers and contractors who prepare a large number of plastic bottles and bricks of different sizes for each water size adjustment. In addition, it is freed from extremely troublesome acts in terms of space.
In addition, bacteria are likely to propagate in the wash water tank, and in particular, bacteria are likely to propagate on the inner surface of the wash water tank and the surfaces of various devices in the wash water tank. Compared to the device, the surface area is increased by the amount of the water level control float, so that the expansion of the bacteria breeding field (surface area) is minimized.

The washing water in the washing water tank has a higher water pressure as the water level is higher, and the amount of water discharged to the toilet in a unit time increases. That is, there is a stronger momentum for cleaning sewage in the toilet bowl at the beginning of the discharge when the water level is high.
According to the water level control device of the present invention, only the washing water when the water level is high is used, and the washing water when the water level drops and the momentum is lost (when the water pressure drops) is not used. Even if the amount of washing water used is reduced, the ability to wash filth is not reduced.
Further, in the conventional apparatus, if the next discharge is performed immediately after the cleaning water is discharged and before the cleaning water tank is full, the water pressure is low and the filth may not be completely cleaned. However, according to the present invention, since a certain amount of washing water is always stored in the lower part of the washing tank, the washing water replenished to the upper part always has a high water pressure. Even when it is released, the filth can be washed with sufficient water pressure.

In order to increase the momentum of the washing water, that is, to increase the amount of water flowing within a unit time and reduce the amount of water, a method of moving the washing water tank to the upper part can be considered.
However, this method is extremely disadvantageous in terms of cost. For example, many flush toilets installed in large hotels, public toilets, etc. have a large number, so it is not possible to use this method for all flush toilets. It is almost impossible in terms of cost.
If the water level adjusting device of the present invention is installed, the washing can be performed only with strong washing water at the initial stage of washing, so that the dirt can be completely removed with a small amount of washing water while maintaining the washing water.

It is the schematic which shows the water level adjustment mechanism of the conventional washing water tank for flush toilets. (A) Shows the storage state of the wash water when not in use. (B) The state at the moment when the operation lever is operated is shown. (C) An initial state in which the operation lever returns to the original state and the washing water starts to flow from the water passage to the toilet. (D) Shows a state in which the replenishing washing water is replenished and the washing water is flowing from the water passage to the toilet. (E) The state where the buoyant plug is closed because the replenishing washing water is replenished and the water level of the washing water is lowered. It is the schematic which shows the water level adjustment mechanism of the washing water tank for flush toilets of this invention. (A) Shows the storage state of the wash water when not in use. (B) The state at the moment when the operation lever is operated is shown. (C) An initial state in which the operation lever returns to the original state and the washing water starts to flow from the water passage to the toilet. (D) Shows a state in which the replenishing washing water is replenished and the washing water is flowing from the water passage to the toilet. (E) Replenished cleaning water is supplied and the stopper is closed because the water level of the cleaning water has dropped. In this invention, in order to adjust the water level of washing water, it is a perspective view which shows an example of the method of fixing a water level adjustment floating ball to the arbitrary places of a water level adjustment chain | strand.

  The present invention relates to a water level adjusting device for a flush water tank for a flush toilet used for saving water. That is, the present invention relates to a flush water tank water level adjusting device that regulates the level of flush water in a flush water tank that stores flush water for washing flush toilets immediately after toilet flushing.

The water level adjusting device of the present invention will be described with reference to the drawings in comparison with a conventional device.
FIG. 1 shows an outline of a conventional water level adjustment mechanism (hereinafter sometimes abbreviated as “conventional mechanism”) of a flush water tank for flush toilets, and FIG. 2 shows a water level adjustment mechanism using the water level adjustment device of the present invention. An overview is shown.
The conventional washing water tank 11 has the stopper device 22 as shown in FIG. 1 and does not have the water level adjusting device 21.
On the other hand, the water level adjusting mechanism in the present invention has a stopper device 22 and a water level adjusting device 21 as shown in FIG. The stopper device 22 has a stopper 23, a stopper arm 24, and a stopper fulcrum 25, and the water level adjusting device 21 has a water level adjusting float 26, a water level adjusting chain 27 and a stopper 23.

The washing water tank 11 has a chain pulling arm 14 and an arm connecting chain 15 that are configured to pull up the water level adjusting device 21 and the stopper device 22 by operating the operation lever 13 after using the toilet bowl.
FIG. 1A and FIG. 2A show a normal state (when not in use) when the cleaning water in the cleaning water tank 11 is full.
The washing water tank 11 has an operation lever 13 which is operated when the filth flows. As shown in FIGS. 1 (b) and 2 (b), when the operation lever 13 is lowered, the chain pulling arm 14 (counterclockwise in FIGS. ) And the arm connection chain 15 connected to the vicinity of the tip of the chain pulling arm 14 is pulled up.

Conventionally, as shown in FIG. 1 (b), when the arm connecting chain 15 is pulled up, the stopper device 22 connected to the arm connecting chain 15 is pulled up to block the water passage 12 to the toilet. The buoyant plug 28 of the plug device 22 was lifted upward and the washing water is discharged in the toilet direction 16 through the water supply pipe 17.
On the other hand, in the water level adjusting mechanism in the present invention, as shown in FIG. 2B, when the arm connecting chain 15 is pulled up, the water level adjusting device 21 fixed to the lower part of the arm connecting chain 15 The stopper device 22 connected by the water level adjusting chain 27 is pulled up, and the stopper 23 of the stopper device 22 that has blocked the water passage 12 to the toilet bowl is pulled up to discharge the flush water to the toilet bowl. It has become.

  The specific gravity of the buoyant plug 28 of the stopper device 22 in the conventional flush water tank 11 is less than 1, and when the buoyant plug 28 closes the water passage 12 to the toilet as shown in FIG. However, once the buoyant plug 28 is pulled up, the buoyant plug 28 having a specific gravity smaller than 1 remains raised by the buoyancy of the washing water. (Refer FIG.1 (b)).

  On the other hand, in the water level adjusting mechanism in the present invention, as shown in FIG. 2B, when the plug 23 closes the water passage 12 to the toilet, the water passage 12 to the toilet is caused by the gravity of water and air. Although it continues to close, once the stopper device 22 is pulled up, the specific gravity of the portion excluding the water level adjustment float 26 from the entire water level adjustment device 21 is greater than 1, but the specific gravity of the entire water level adjustment device 21 is less than 1. In addition, as in the conventional mechanism, the entire water level adjusting device 21 having a specific gravity smaller than 1 remains raised due to the buoyancy of the washing water, so that the plug 23 also remains raised (see FIG. 2B).

  In other words, in the present invention, the water level adjusting device 21 that has been once pulled up by operating the operation lever 13 causes the flushing water to be discharged to the toilet bowl by releasing the plug 23 from the water passage 12 to the toilet bowl. Until the water level WL is lowered and the water level WL reaches the water level control floating ball 26, the state where the water level WL is raised by buoyancy is maintained.

The buoyant plug 28 of the conventional mechanism is designed to allow air to enter inside, and the specific gravity is kept at 1 or less. However, the water intrusion prevention member 29 is provided to prevent the washing water from entering the inside and increase the specific gravity. May be attached.
Even in the water level adjusting mechanism of the present invention, the water intrusion preventing member 29 may be attached. However, the specific gravity of the portion excluding the water level adjusting float 26 from the entire water level adjusting device 21 is larger than 1, so that the specific gravity of the plug 23 It is not necessary to set the plug 23 to 1 or less, that is, the stopper 23 may be submerged in water, so that the water intrusion prevention member 29 may not be provided.

  The structure of the plug 23 in the water level adjusting device 21 of the present invention is not particularly limited as long as it can prevent the washing water from flowing into the drain pipe. As shown in the above, it may have a structure in which some air enters as long as the specific gravity is not unnecessarily lowered.

The material of the plug 23 in the water level adjusting device 21 of the present invention is not particularly limited, and plastic such as thermosetting resin and thermoplastic resin; rubber; metal; inorganic substance such as glass;
However, the material of at least the surface of the plug 23 that is in contact with the bottom surface 11a of the cleaning water tank is preferably one whose elasticity is lower than a certain value from the viewpoint of preventing leakage of the cleaning water to the drain pipe, such as rubber, low-elasticity plastic, etc. Preferably rubber is particularly preferred.

  As shown in FIGS. 1C and 2C, when the operation lever 13 is returned to the original position, the stopper arm 24 is also returned to the original position and becomes horizontal. However, since the specific gravity of the buoyant plug 28 of the conventional mechanism or the conventional plug device 22 and the specific gravity of the entire water level adjusting device 21 in the present invention are 1 or less, the chain remains pulled up and the chain is slackened. 23 does not close.

When the wash water begins to be discharged toward the toilet in the state where the plug 23 is open, the water level WL of the wash water is lowered, so that the water discharge start floating ball 34 is lowered and the water discharge start floating ball arm 35 is (FIG. 1 (d) 2), the float valve system 31 is actuated to open the float valve 32, and the replenishing washing water W is replenished into the washing water tank 11 from the water outlet 33.
That is, in the cleaning water tank 11 according to the present invention, the cleaning water is discharged from the water passage 12 to the toilet bowl opened on the bottom surface of the cleaning water tank 11 and the cleaning water level WL in the cleaning water tank 11 is full. It has a float valve system 31 adapted to replenish wash water tank 11 when it is lowered.

Since the discharge rate of the wash water to the toilet is faster than the replenishment rate of the replenishment wash water W, the water level WL gradually decreases.
In the conventional mechanism, as shown in FIG. 1 (e), buoyancy disappears when almost all of the wash water in the wash water tank 11 is released, that is, when the upper part of the buoyancy plug 28 is exposed from the water level WL. The buoyancy plug 28 is closed.

On the other hand, the water level adjusting device 21 of the present invention includes a plug 23 that closes the water passage 12 to the toilet, and a water level adjusting float 26 that is connected to the plug 23 by a water level adjusting chain 27. Since the specific gravity of the portion excluding the water level adjustment float 26 from the whole is larger than 1, the stopper 23 is formed when the water level WL of the washing water is lowered and the upper part of the water level adjustment float 26 is exposed from the water level WL and the buoyancy is reduced. That is, the water level adjusting device 21 is lowered, that is, the plug 23 sinks in the washing water and the plug 23 is closed.
That is, in the present invention, at the stage where the water level WL of the washing water has dropped to reach the water level adjustment floating ball 26, the water level adjustment device 21 is lowered by the buoyancy caused by the water level adjustment floating ball 26 and the water level adjustment device 21 is plugged. 23 is configured to block the water passage 12 to the toilet bowl.

Once the plug 23 is closed, the plug 23 is strongly closed by the gravity of the cleaning water already remaining in the cleaning water tank 11. This operation is important in the present invention and is a feature of the present invention.
That is, the water level WL of the cleaning water is lowered, the water level adjustment float 26 is exposed from the water level WL, the water level adjustment device 21 is lowered, and the stopper 23 is closed. Closes strongly. This operation occurs in an instant, and the plug 23 is always closed with a certain amount of washing water, and at the same time, the plug 23 is strongly closed instantly due to the gravity of the water and does not leak.

  As a result, when the water level adjusting device 21 of the present invention is used, the stopper 23 is closed while leaving the cleaning water in the cleaning water tank substantially by the length of the water level adjusting chain 27, and the remaining cleaning water remains. It is possible to save water by the minute.

Since the wash water discharged from the bottom of the wash water tank 11 to the toilet bowl has no momentum (the flow rate per unit time is small), the wash water left in the wash tank is washed even if it is discharged to the toilet bowl. Since there is not much effect, only water saving is possible while maintaining the cleaning effect.
Even if the washing tank is moved up, it is possible to gain momentum in the washing water, but there are many flush toilets installed in large hotels, public toilets, etc. It is almost impossible in terms of cost to perform the construction of moving the cleaning tank upward.
If the water level adjusting device 21 of the present invention is installed, the washing can be performed only with the strong washing water at the initial stage of washing, and therefore the filth can be removed with a small amount of washing water while maintaining the washing water.

In the present invention, the arm connecting chain 15 and the water level adjusting chain 27 are integrated, and the water level adjusting floating ball 26 is provided with a fixing jig for the integrated chain. It is preferable that the water level adjusting float 26 can be variably fixed to an arbitrary position of the chain.
When the arm connection chain 15 and the water level adjustment chain 27 are integrated, the upper part of the water level adjustment floating ball 26 is referred to as the arm connection chain 15, and the lower part of the water level adjustment float 26 is referred to as the water level adjustment chain 27.

“Variably fixing” means fixing the water level adjusting floating ball 26 once fixed so that it can be easily moved up or down the chain and fixed again.
If the water level adjustment float 26 is fixed to one point with a chain and the washing water is poured, if the amount of water is too small, the water level adjustment float 26 can be moved and fixed below the chain to fix the water. The amount can be increased. On the other hand, when the amount of water is too large, the amount of water released by one use can be reduced by moving the water level adjusting float 26 above the chain and fixing it.

  A particularly preferred embodiment is as shown in FIG. That is, a fixing jig 26a and / or 26b is provided at the center portion of the water level adjustment floating ball 26, and the fixing jig fixes the water level adjustment floating ball 26 to the chain so as to press the chain from around. In particular, the water level adjusting float 26 can be variably fixed to an arbitrary position of the chain by manually moving the water level adjustable float 26 up and down. preferable.

The specific shape of the fixing jig is not particularly limited as long as it satisfies the above requirements, but a fixing jig (a type) 26a and / or a fixing jig (b type) 26b having a shape as shown in FIG. 3 is preferable. .
The fixing jig (a type) or the fixing jig (b type) has a notch from one side surface of the plate-shaped jig, and a chain is inserted into the notch and fixed.

In FIG. 3, the fixing jig (a type) and the fixing jig (b type) are drawn outside the water level adjustment floating ball 26, but are actually held at appropriate positions inside the water level adjustment floating ball 26. ing.
The fixing jig (a type) and the fixing jig (b type) are preferably fastened to the center in the horizontal direction of the water level adjustment float 26. The vertical direction may be held anywhere above or below the water level adjusting float 26.
The fixing jig (a type) and / or the fixing jig (b type) are fastened at two locations in the vertical direction of the water level adjusting float 26. It is particularly preferable in that it can be fixed to the surface.

The arm connecting chain 15 and the water level adjusting chain 27 are preferably ball chains.
In particular, when the fixing jig is the fixing jig (a type) 26a or the fixing jig (b type) 26b shown in FIG. 3, both the arm connecting chain 15 and the water level adjusting chain 27 are balls. The chain is particularly preferable because the water level adjusting float 26 fixed to the chain is not easily displaced. It is preferable that the arm connecting chain 15 and the water level adjusting chain 27 are an integrated ball chain.

From the “state in which the plug 23 blocks the water passage 12 to the toilet bowl” shown in FIG. 2E, the replenishing washing water W starts to be stored in the washing water tank 11, and the “washing” shown in FIG. It returns to the “normal state (when not in use) when the wash water in the water tank 11 is full”.
Hereinafter, by repeating it, it is integrated and water saving becomes possible.

  The water level control device can be attached to a flush water tank of a domestic flush toilet, but it can be particularly suitably installed even when there are a large number of flush toilets such as accommodation facilities, public toilets, etc. Therefore, the running cost can be saved, so that it is widely used for the field of flush toilet production, maintenance, and owners or managers of households, lodging facilities, public toilets, and the like.

DESCRIPTION OF SYMBOLS 11 ... Wash water tank 11a ... Wash water tank bottom surface 11b ... Wash water tank side surface 12 ... Water passage to toilet 13 ... Operate lever 14 ... Chain pull-up arm 15 ··· Arm connection chain 16 ··· Toilet direction 17 ··· Water supply pipe 21 ··· Water level adjustment device 22 · · · Plug device 23 · · · Plug 24 · · · Plug arm 25 ··· Plug stopper 26 ··· Water level adjusting float 26a · Fixing jig (a type)
26b ... Fixing jig (b type)
27... Water level adjustment chain 28... Buoyant plug 29... Water intrusion prevention member 31 ... Float valve system 32 ... Float valve 33 ... Water outlet 34・ ・ Floating ball 35 ・ ・ ・ ・ Floating ball arm W ・ Supply washing water WL ・ ・ ・ ・ Water level

Claims (8)

A water level adjusting device for adjusting the water level immediately after cleaning the toilet bowl in the cleaning water tank for storing the cleaning water for cleaning the flush toilet,
The washing water tank has a chain raising arm and an arm connecting chain adapted to pull up the water level adjusting device and the stopper device by operating an operation lever after using the toilet, A float designed to replenish wash water to the wash water tank when the wash water level in the wash water tank is lowered from the full level when it is discharged to the toilet from the water channel opened at the bottom of the wash water tank. Has a valve system,
The water level adjusting device has a plug that closes the water passage, and a water level adjustment floating ball that is connected to the stopper by a water level adjusting chain. The water is released by the buoyancy until the water level reaches the water level control float, and the water level is maintained by the buoyancy. When the water level adjustment buoy ball is lowered and the buoyancy due to the water level adjustment buoy ball is lost, the water level adjustment device is lowered, and the stopper of the water level adjustment device blocks the water passage to the toilet. A water level adjusting device characterized by that.   The arm connecting chain and the water level adjusting chain are integrated, and the water level adjusting floating ball is provided with a fixing jig for the integrated chain, and an arbitrary position of the integrated chain. The water level adjusting device according to claim 1, wherein the water level adjusting floating ball can be variably fixed to the water level adjusting device.   The fixing jig is provided in the center portion of the water level adjusting float, and the fixing jig can fix the water level adjusting float to the chain by pressing the chain from the surroundings. The water level adjustment according to claim 1 or 2, wherein the water level adjustment floating ball can be variably fixed at an arbitrary position of the chain by manually moving the water level adjustment floating ball up and down. apparatus.   The water level according to any one of claims 1 to 3, wherein the specific gravity of the entire water level adjusting device is smaller than 1, and the specific gravity of a portion excluding the water level adjusting floating ball from the entire water level adjusting device is larger than 1. Adjusting device.   The water level adjusting device according to any one of claims 1 to 4, wherein each of the arm connecting chain and the water level adjusting chain is a ball chain.   The water level adjusting device according to any one of claims 1 to 5, wherein a material of at least a surface of the stopper contacting the bottom surface of the washing water tank is rubber.   A washing water tank for a flush toilet, comprising the water level adjusting device according to any one of claims 1 to 6.   A flush toilet comprising the flush water tank equipped with the water level adjusting device according to any one of claims 1 to 6.

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