JP2016191241A - Wash water tank device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to simply and easily fix a tank body to a base plate, by reducing the number of components and assembling man-hours.SOLUTION: A wash water tank device 6 comprises: a tank body 10 for storing wash water; and a base plate 11 to be installed on a toilet bowl body's top surface. The tank body 10 has a bottom surface 18 having a protruding cylindrical drain outlet 15, a pair of claw pieces 28 provided on both sides of the drain outlet 15, and a pair of fitting parts 29 outside the claw pieces. The fitting parts 29 protrude on the tip side further than the claw pieces 28. The base plate 11 has a water receiving tray 24 having a pair of claw parts 25 that is provided on both sides of opening 23, into which the drain outlet 15 is to be inserted, and is to be engaged with the claw pieces 28, and a pair of fitting receiving parts 26 to be fitted with the fitting parts 29. A hole is formed on a claw part 25's base to discharge water dropped in the water receiving tray to the toilet bowl body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a washing water tank apparatus provided with a fixing means for fixing a tank body of a washing water tank storing washing water for washing a toilet body and the like to a base plate.

Conventionally, for example, those described in Patent Documents 1 and 2 are known as fixing means for attaching a washing water tank storing washing water to an upper part of a toilet body.
The toilet bowl described in Patent Document 1 includes a tank cover outside the inner tank that stores wash water, and a drain port that penetrates the bottom surface of the tank cover and communicates with the water distribution pipe of the toilet body. Is provided. Moreover, a pair of bolts fixed to the bottom surface of the inner tank via a fixture are temporarily fixed with a snap ring in a state of penetrating the bottom surface of the tank cover. And while connecting the drain outlet of an inner side tank to the water distribution pipe of a toilet bowl main body, a pair of volt | bolt protrudes in the back side of a toilet bowl through the attachment hole of a toilet bowl main body, and is fixed with the nut.

  Moreover, the tank apparatus described in Patent Document 2 has a hooked nut fixed to a male screw formed on the outer surface of the drainage port at a position where the drainage port provided on the bottom surface of the inner tank penetrates the hole on the bottom surface of the tank cover. Are integrated. Then, the upper male screw portion of the fixing bolt is received and screwed with a nut through the hole of the tank cover, and the lower male screw portion of the fixing bolt is passed through the back surface inside the toilet body and fixed with the nut. Thus, the double tank is fixed to the toilet body.

Japanese Patent Laid-Open No. 09-221804 JP 2011-241545 A

  However, the washing tank fixing structure described in Patent Document 1 is integrated by fixing a pair of bolts to the bottom surface of the inner tank and temporarily fixing them with a snap ring through a hole in the tank cover. Since the structure is such that each nut is passed through the back of the body and tightened with a nut, the number of parts of the cleaning tank fixing structure is large, and the fixing method is complicated and time-consuming.

  In addition, the cleaning tank fixing structure described in Patent Document 2 includes a cleaning water drain and a hooked nut connecting the inner tank and the tank cover, and a fixing bolt including an upper male screw portion and a lower male screw portion. Since the structure is such that the inside of the tank cover and the back side of the toilet body are screwed with nuts, the number of parts of the fixing structure is large as in Patent Document 1, and the fixing method is complicated and troublesome.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide a cleaning water tank apparatus that can easily and easily fix a tank body and a base plate by reducing the number of parts and the number of assembly steps. And

A cleaning water tank apparatus according to the present invention includes a tank main body for storing cleaning water and a base plate installed at a lower portion of the tank main body. The tank main body is provided with a locking portion, and the base plate can be engaged with the locking portion. The latch receiving part is provided, and the latch part and the latch receiving part are fixed by pressing each other.
In the washing water tank apparatus according to the present invention, when the tank body storing the washing water is fixed to a base plate installed on a member such as a toilet bowl body, when the tank body is pressed against the base plate, the locking portion of the tank body engages the base plate. Since it engages with the stopper part, the number of parts is small, and it can be easily fixed without the trouble of rotating and fastening bolts and nuts.

Moreover, it is preferable that a latching | locking part and a latching receiving part are a nail piece and a nail | claw part which can be mutually engaged.
Since the locking portion of the tank body and the locking receiving portion of the base plate are a claw piece and a claw portion that can be engaged with each other, the claw piece and the claw portion can be elastically deformed and engaged with each other by contacting each other.

Moreover, it is preferable that a latching | locking part and a latching receiving part are a fitting part and a fitting receiving part which mutually fit and prevent relative rotation.
Since the locking portion and the locking receiving portion are a fitting portion and a fitting receiving portion that are fitted to each other, relative rotation between the tank main body and the base plate can be prevented in a fitted state of the fitting portion and the fitting receiving portion.

The locking portion and the locking receiving portion include a claw piece and a claw portion that can be engaged with each other, and a fitting portion and a fitting receiving portion that are fitted to each other to prevent relative rotation, It is preferable that the fitting receiving part protrudes from the claw piece or the claw part.
When the tank body and the base plate are engaged and fixed by the locking portion and the locking receiving portion, the fitting portion or the fitting receiving portion protrudes to the tip side from the claw piece or the claw portion. And the fitting receiving part are positioned first, and the claw piece and the claw part are securely engaged and fixed in a state guided by the fitting part and the fitting receiving part that are fitted to each other. Can do.

Moreover, you may form a hole in the vicinity of the nail | claw part formed in the baseplate.
Since the hole is formed in the vicinity of the claw portion in the base plate, water such as condensed water that flows down the outer surface of the tank body flows into the toilet body and the like from the base plate through the hole in the vicinity of the claw portion.

The bottom surface of the tank body may be fixed to the water receiving portion of the base plate, and the water flowing down the outer surface of the tank body may be guided to the water receiving portion.
Since the bottom of the tank body is fixed to the water receiving part of the base plate with the tank body and base plate fixed by the locking part and the locking receiving part, the condensed water adhering to the outer surface of the tank body is transmitted to the outer surface. Can fall and collect in the water receiver.

  According to the cleaning water tank apparatus of the present invention, by pressing the tank main body and the base plate, the locking portion provided on the tank main body and the locking receiving portion provided on the base plate can be locked and fixed to each other. Therefore, the number of parts and assembly man-hours of the tank body and the base plate can be reduced.

It is a perspective view of the warm water washing toilet bowl by the embodiment of the present invention. It is explanatory drawing which shows the tank main body and baseplate which were installed in the tank cover inner side of the low tank shown in FIG. 1 in a partial cross section. It is the perspective view which isolate | separated the tank main body and the baseplate. It is an enlarged view of the bottom face of a tank body. It is a figure which shows the engagement state of the nail | claw piece of a tank main body, and the nail | claw part of a baseplate, (a) is a principal part enlarged view, (b) is sectional drawing of the same figure (a). It is explanatory drawing which shows the engagement state of the fitting part of a tank main body, and the fitting receiving part of a baseplate, (a) is a perspective view, (b) is a top view. It is a principal part front view which shows the state which fixed the tank main body to the base plate, and fixed the hot water washing electrical component and the deodorizer to the base plate.

Hereinafter, a hot water cleaning toilet 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.
FIG. 1 shows a hot water flush toilet 1 according to an embodiment of the present invention. For example, a toilet seat 3 is installed on the upper part of a ceramic toilet body 2, and a low tank 5 is installed at the rear end of the toilet seat 3, for example. Yes. The low tank 5 is provided with a lid 8 that can be opened and closed at an upper portion of a tank cover 7 provided on the outside, and inside thereof, as shown in FIG. 2, a tank for storing washing water for washing the inside of the toilet body 2. A main body 10 and a base plate 11 fixed to the toilet body 2 are installed. The tank cover 7, the tank body 10, and the base plate 11 constitute a cleaning water tank device 6.

2 and 3, the tank body 10 is made of, for example, resin or ceramics, and a base plate 11 fixed to the rear end side of the toilet body 2 is connected to the lower end of the tank body 10. . In the tank body 10 shown in FIG. 2, a ball tap 9 for supplying cleaning water into the tank body 10, an overflow pipe 12, a flapper valve 13 provided with a floating ball 13 a, and the like are installed.
A substantially cylindrical drain port 15 for draining the water in the tank body 10 into the toilet body 2 is formed on the bottom surface 18 which is the lower end of the tank body 10 so as to protrude downward. A flapper valve 13 that can be opened and closed is installed in the drainage port 15, and the flapper valve 13 switches between draining the wash water passing through the valve seat 15 a located inside the drainage port 15 and stopping the drainage.

An arm portion 16 supported by the overflow pipe 12 is connected to the flapper valve 13, and supports the flapper valve 13 so as to be openable and closable around the shaft portion of the arm portion 16. The flapper valve 13 is connected to an operation lever outside the low tank 5 by a ball chain 14 connected via a flash motor and an L-shaped shaft, and the flapper valve 13 can be opened by rotating the operation lever.
The overflow pipe 12 is formed in, for example, a tapered substantially cylindrical shape, and the lower end portion is connected to the drain port 15. When the water level in the tank body 10 is located above the upper end opening of the overflow pipe 12, water flows into the interior from the upper end opening of the overflow pipe 12, passes through the valve seat 15 a inside the drain port 15 from the lower end portion, and the toilet body 2 is discharged.

Further, the upper surface 17 of the tank body 10 has, for example, a substantially square shape in plan view, and the lower surface has a bottom surface 18 having a diameter smaller than that of the upper surface 17. Protrudes downward. Further, the outer surface of the tank body 10 is the side having the toilet body 2 as the front surface 10a, the wall surface side of the toilet room facing the front surface 10a is the back surface 10b, and the side portion sandwiched between the front surface 10a and the back surface 10b is the side surface. 10c and 10d. It is preferable that the upper region of the tank body 10 is formed with a diameter expanded outward in order to secure a storage amount of cleaning water.
In FIG. 2, both side surfaces 10 c and 10 d are curved and inclined so as to decrease in diameter toward the lower side at the intermediate portion in the height direction. One side surface 10c (for example, the left side in FIG. 2) of the tank body 10 has a first inclined surface 19 that has a relatively large diameter reduction, and the opposite side surface 10d (for example, the right side in FIG. 2) has a relatively small diameter reduction. The second inclined surface 20 is provided. In addition, the second inclined surface 20 is formed below the first inclined surface 19.

The first inclined surface 19 has a radius R1 of the curved surface that is variable and is set relatively large to form a convex curved surface, and the lower side reaches the bottom surface 18 with an inclined surface close to a vertical surface. Further, the second inclined surface 20 has a curved surface with a radius R2 which is variable and set to be relatively small to form a convex curved surface, and the lower side reaches the bottom surface 18 with a substantially vertical surface.
The radius R1 of the first inclined surface 19 and the radius R2 of the second inclined surface 20 are such that the water droplets (condensed water) condensed on the inclined surfaces 19 and 20 and the upper and lower portions thereof do not fall. It is formed so as to flow down to the bottom surface 18 along the two inclined surfaces 20. The radius R2 of the second inclined surface 20 is set to 30 mm or more, for example, and the radius R1 of the first inclined surface 19 is set to be equal to or larger than the radius R2, for example. The first inclined surface 19 and the second inclined surface 20 may have the same size, or the second inclined surface 20 may be larger.
Further, the front surface 10 a of the tank body 10 may be inclined so as to be slightly reduced in diameter toward the lower side in the vicinity of the bottom surface 18 in order to install an electrical component on the base plate 11. The back surface 10b is preferably formed on a substantially vertical surface in order to ensure the amount of washing water.

Next, the base plate 11 will be described with reference to FIG. The base plate 11 is a substrate that connects the tank body 10 and can be installed with hot water cleaning electrical components 31 and deodorizers 32 described later on both sides thereof.
The base plate 11 has an opening 23 through which the drain port 15 provided on the bottom surface 18 of the tank body 10 is inserted downward. Condensation that flows down from the front surface 10a, the back surface 10b, and the both side surfaces 10c, 10d of the tank body 10 around the base plate 11. A wall surface 24a that forms a water receiving tray 24 as a water receiving portion that receives water and water droplets and flows to the toilet body 2 is formed in a substantially rectangular shape, for example. A claw portion 25 and a fitting receiving portion 26, which will be described later, provided on the water receiving tray 24 are fixed by receiving a claw piece 26 and a fitting portion 29, which will be described later, provided on the reduced diameter bottom surface 18 of the tank body 10. Reference numeral 24 denotes an area smaller than the upper surface 17.

Moreover, in the water tray 24 shown in FIG. 3, a pair of claw portions 25 having a substantially L-shaped cross section and a pair of generally U-shaped cross sections formed on the outside thereof at positions facing each other across the opening 23. The receiving portion 26 is formed so as to protrude upward.
Here, as shown in FIGS. 3, 5A, and 5B, the pair of claw portions 25 includes a claw portion main body 25a that is curved in a substantially L-shaped cross section and a partition provided at both ends thereof. Each has a wall 25b. Moreover, a hole 30 covered with the claw body 25a is formed at the base of each claw 25. Condensed water or the like flowing into the water tray 24 falls into the toilet body 2 below through the hole 30.
Further, as shown in FIGS. 3 and 6A and 6B, the pair of fitting receiving portions 26 are formed in a substantially U shape that protrudes inward when viewed in a horizontal section. The fitting receiving portion 26 is formed of a protruding portion 26 a that protrudes in a substantially U shape inside the water receiving tray 24 and auxiliary portions 26 b that extend on both sides thereof.

On the other hand, on the bottom surface 18 of the tank body 10 shown in FIGS. 3 and 4, a pair of claw pieces 28 having a substantially L-shaped cross section that can be engaged with the claw portions 25 at positions facing the drain port 15. A pair of fitting portions 29 having a substantially T-shaped cross section that is located outside thereof and can be engaged with the fitting receiving portion 26 are formed. Here, as shown in FIGS. 5A and 5B, each claw piece 28 has a substantially L-shaped cross section facing outward without a partition wall. When the tank main body 10 is lowered, the claw piece 28 comes into contact with the claw portion 25 of the water tray 24 and is elastically deformed to engage with the claw portion main body 25a.
Moreover, each fitting part 29 is a substantially T shape which protrudes inside. The fitting portion 29 is formed by a central protruding piece 29a and an auxiliary piece 29b extending substantially orthogonal to the central protruding piece 29a. Small protrusions 29ab may be formed on both sides of the center protruding piece 29a fitted to the fitting receiving part 26 of the fitting part 29, and the protrusion 29ab contacts within the protruding part 26a of the fitting receiving part 26. Thus, mutual displacement and rotation can be prevented. In addition, the auxiliary | assistant part 26b and the auxiliary piece 29b are located substantially parallel.

In addition, the pair of fitting portions 29 are formed so as to protrude downward from the claw pieces 28, and when the tank body 10 is fixed to the base plate 11, the fitting receiving portions 26 are respectively connected to the pair of fitting portions 29. By fitting, it guides so that engagement of a pair of nail | claw part 25 installed in the inner side and the nail | claw piece 28 may be ensured. In addition, it is possible to prevent the claw piece 28 from coming into contact with the claw portion 25 and being damaged before the fitting portion 29 comes into contact with the fitting receiving portion 26.
Therefore, with the tank body 10 connected to the base plate 11, the bottom surface 18 of the tank body 10 is located in the water tray 24, and condensed water and water droplets adhering to the outer surface of the tank body 10 are guided to the water tray 24. It will be.
In FIG. 3, each pair of claw portions 25 and the fitting receiving portion 26 provided to face each other with the opening 23 interposed therebetween are positioned substantially linearly. However, each pair of claw portions 25 and the fitting receiving portion The arrangement of 26 may be shifted in the circumferential direction.

Next, in the washing water tank apparatus 6 shown in FIG. 2, in the state where the tank main body 10 is connected to the base plate 11, the first inclined surface 19 on the one side surface 10c in the region of the reduced diameter of the tank main body 10 is provided. A lower space K1 and a lower space K2 of the second inclined surface 20 on the other side surface 10d are formed.
As shown in FIG. 7, the washing water tank apparatus 6 is provided with a hot water washing electrical component 31 for washing, for example, a hot water in a space K <b> 1 on the base plate 11. In the space K2, for example, a deodorizer 32 including an electrical component for deodorization and a deodorization filter is installed. In addition, electrical components 33 related to or separate from these are also installed on the front surface 10 a side of the tank body 10.

In addition, the external thread part 35 is formed in the outer peripheral surface of the drain port 15 of the tank main body 10, and you may enable it to engage with the hooked cap 36 which formed the internal thread in the inner surface (refer FIG. 2).
Further, a step 10ca made of a curved surface is formed in one side surface 10c of the tank main body 10 in the vertical direction, and a water supply pipe 37 for supplying tap water to the water supply unit 9 in the tank main body 10 is connected to the upper part thereof. Yes. Further, in the water tray 24 of the base plate 11 shown in FIG. 3, in order to position the tank main body 10 and prevent the tank main body 10 from falling down, a linear shape for receiving the rib 39 provided on the bottom surface 18 shown in FIG. A tank receiver 38 made of ribs is formed.

The flush water tank device 6 of the warm water flush toilet 1 according to the present embodiment has the above-described configuration, and a method for attaching the tank body 10 will be described next.
In assembling the warm water flush toilet 1 according to the present embodiment, the bottom surface 18 of the tank body 10 is pressed and fixed to the water tray 24 of the base plate 11 with the base plate 11 fixed to the rear end side of the upper surface of the toilet body 2. . At that time, the drain port 15 of the tank body 10 is opposed to the opening 23 of the base plate 11, and the bottom surface 18 of the tank body 10 is brought close to the water tray 24. Then, first, the drain port 15 of the tank body 10 is inserted into the opening 23 of the water tray 24.

Next, since the pair of fitting portions 29 provided in the tank main body 10 protrude downward from the claw pieces 28, they come into contact with the fitting receiving portion 26 of the water receiving tray 24, and the central protruding piece 29 a of the fitting portion 29. Are fitted to guide the claw pieces 28 to come into contact with the pair of claw portions 25.
When the tank body 10 is further pushed in, the fitting portion 29 is completely fitted into the fitting receiving portion 26. After this, the claw piece 28 comes into contact with the claw portion 25 and elastically deforms, and gets over and engages with each other.
In this way, the tank body 10 is fixed in contact with the water tray 24 of the base plate 11.

In the state where the claw piece 28 and the fitting portion 29 provided on the bottom surface 18 of the tank main body 10 are engaged with the claw portion 25 and the fitting receiving portion 26 of the water receiving tray 24, the outer surface of the tank main body 10 is stored internally. Condensation may occur below the water surface line. Condensed water adhering to the front surface 10a and the back surface 10b of the tank body 10 has a small downward slope, and therefore flows down the water tray 24 on the base plate 11 through the front surface 10a and the back surface 10b. Further, the condensed water adhering to the both side surfaces 10c, 10d of the tank body 10 flows down on the water tray 24 along the convex curved surfaces of the first inclined surface 19 and the second inclined surface 20, respectively.
Therefore, it is possible to prevent the condensed water adhering to the side surfaces 10c and 10d from being separated by the first inclined surface 19 and the second inclined surface 20 and falling to the hot water washing electrical component 31 and the deodorizer 32. The water that has flowed down to the water tray 24 can be discharged into the toilet body 2 from the hole 30 formed in the claw portion 25.

As described above, according to the flush water tank device 6 of the hot water flush toilet 1 according to the present embodiment, the bottom 18 of the tank body 10 is pressed against the water tray 24 of the base plate 11 so as to face the drain port 15 therebetween. The arranged fitting receiving portion 26 and fitting portion 29 and the claw portion 25 and the claw piece 28 can be fitted to each other. Moreover, the tank body 10 and the base plate 11 are prevented from rotating relative to each other by the engagement of the fitting receiving portion 26 and the fitting portion 29, and the vertical displacement is prevented by the engagement of the claw portion 25 and the claw piece 28.
In addition, since bolts and nuts are not required for fixing the tank body 10 and the base plate 11, the number of parts and the number of assembly steps can be reduced.
Further, when the tank body 10 and the base plate 11 are fixed, the drain port 15 is first inserted into the opening 23, and then the fitting receiving portion 26 and the fitting portion 29 are fitted, whereby the claw portion 25 and the claw piece 28 engagement can be guided.
Further, when the claw portion 25 is formed on the base plate 11, the water that has fallen into the water receiving tray 24 through the hole portion 30 of the claw portion 25 formed for mold processing can be discharged into the toilet body 2.

  In addition, the washing water tank apparatus 6 of the warm water washing toilet 1 according to the present invention is not limited to the above-described embodiment, and can be appropriately changed or replaced without departing from the gist of the present invention. In the following, modifications of the present invention will be described. However, the same or similar components or members described in the above-described embodiments are denoted by the same reference numerals and description thereof is omitted.

For example, each pair of claw portions 25 and the fitting receiving portion 26 provided facing each other across the opening 23 are positioned substantially linearly, but the arrangement of each pair of claw portions 25 and the fitting receiving portion 26 is provided. You may arrange | position in the position which mutually cross | intersects (in the range in which the arrangement | positioning shift | offset | difference of the nail | claw piece 28 and the fitting part 29 in the bottom face 18 of the tank main body 10 is possible).
Further, since the claw portion 25 disposed on the base plate 11 has a claw portion main body 25a and partition walls 25b at both ends thereof, the claw pieces 28 engaged with the claw piece 28 can prevent the tank body 10 from being displaced in the rotational direction. Therefore, installation of the fitting receiving part 26 and the fitting part 29 may be omitted. On the contrary, since at least one of the tank body 10 and the tank cover 7 is made of earthenware, the weight is large, so that the installation of the claw portion 25 and the claw piece 28 may be omitted.

In the embodiment described above, the fitting portion 29 of the tank body 10 is configured to protrude downward from the claw piece 28. Instead, the fitting receiving portion 26 of the base plate 11 protrudes upward from the claw portion 25. You may comprise as follows. Instead of the configuration of the embodiment, the claw piece 28 and the fitting portion 29 of the tank main body 10 may be provided on the base plate 11, and the claw portion 25 and the fitting receiving portion 26 of the base plate 11 may be provided on the tank main body 10.
Further, as the claw piece 28 and the claw portion 25, a substantially spherical protrusion and its fitting hole may be employed instead of the substantially L-shaped cross section. Further, as the fitting portion 29 and the fitting receiving portion 26, an I-shaped convex portion and a two-line receiving portion sandwiching the convex portion may be adopted instead of the substantially T-shaped and U-shaped ones. . The shapes of the claw piece 28 and the claw portion 25, and the fitting portion 29 and the fitting receiving portion 26 can be arbitrarily adopted as long as they can be engaged by pressing each other.

In the above-described embodiment, the claw piece 28 and the fitting portion 29 provided on the bottom surface 18 of the tank body 10 are pressed to the claw portion 25 and the fitting receiving portion 26 provided on the base plate 11 in the vertical direction and fixed to each other. However, the present invention is not limited to such a configuration. For example, a concave portion that opens in the horizontal direction is formed in one of the tank body 10 and the base plate 11, and a convex portion that can be fitted into the concave portion is formed in the other. The protrusions may be fitted and fixed together.
Therefore, “pressing” in the present invention includes pressing by the vertical engaging operation and the horizontal engaging operation between the tank body 10 and the base plate 11.

In addition, in embodiment mentioned above, although the nail | claw part 25 and the fitting receiving part 26, and the nail | claw piece 28 and the fitting part 29 were each provided separately, you may form integrally.
Moreover, in this invention, the nail | claw piece 28, the fitting part 29, and a convex part comprise a latching part, and the nail | claw part 25, the fitting receiving part 26, and a recessed part comprise a latching receiving part.
The washing water tank apparatus according to the present invention is not limited to the low tank 5 and can be applied to an appropriate tank employed in the hot water washing toilet 1. In addition, although this invention demonstrated the warm water washing toilet bowl 1, this invention can be installed also in the flush toilet bowl which abbreviate | omitted the instrument for warm water washing.

DESCRIPTION OF SYMBOLS 1 Hot water washing toilet 2 Toilet body 5 Low tank 6 Washing water tank apparatus 10 Tank main body 11 Base plate 15 Drain outlet 18 Bottom 23 Opening 24 Water tray 25 Claw part 26 Fitting receiving part 28 Claw piece 29 Fitting part 30 Hole part

Claims (6)

A tank body for storing cleaning water;
A base plate installed at the bottom of the tank body,
The tank body is provided with a locking portion, and the base plate is provided with a locking receiving portion that can be engaged with the locking portion, and the locking portion and the locking receiving portion are fixed by pressing each other. A cleaning water tank device characterized by that.   The cleaning water tank apparatus according to claim 1, wherein the locking portion and the locking receiving portion are a claw piece and a claw portion that can be engaged with each other.   The washing water tank apparatus according to claim 1 or 2, wherein the locking portion and the locking receiving portion are a fitting portion and a fitting receiving portion that are fitted to each other to prevent relative rotation.   The locking portion and the locking receiving portion include a claw piece and a claw portion that can be engaged with each other, and a fitting portion and a fitting receiving portion that are fitted to each other to prevent relative rotation, and the fitting portion or the fitting receiving portion. The flush water tank apparatus according to claim 1, wherein the receiving portion protrudes from the claw piece or the claw portion.   The cleaning water tank apparatus according to claim 2 or 4, wherein a hole is formed in the vicinity of the claw portion formed in the base plate.   6. The tank body according to claim 1, wherein a bottom surface of the tank body is fixed to a water receiving portion of the base plate, and water flowing down an outer surface of the tank body is guided to the water receiving portion. Washing water tank device.