Locking device for toilet seat and water tank

Abstract

A locking device for a toilet seat and a water tank comprises two locking assemblies, and each locking assembly comprises a water tank preassembling assembly and a toilet nut. The water tank pre-assembling assembly can be pre-installed and fixed at each water tank through hole of a water tank, and a screwing part is formed on the water tank pre-assembling assembly and can downwards penetrate through a closestool through hole of a closestool seat, so that the closestool nut is screwed and locked from the lower part of the closestool seat, and the water tank is locked on the closestool seat. The screwing portion can only penetrate through the water tank penetrating hole, then a water tank bolt is screwed to the screwing portion, then the water tank bolt penetrates through the closestool penetrating hole downwards to lock the closestool nut, and the water tank can be locked to the closestool seat as well. Therefore, a convenient, rapid and firm assembly effect can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of installation structures of toilet seats and water tanks, and in particular to a locking device for toilet seats and water tanks. Background Art

[0002] In a typical split-type toilet, the water tank and the toilet seat are separated from each other, so they must be assembled and fixed together through various assembly or connection structures or devices. A common assembly structure is to pass two long bolts with waterproof washers through the water tank holes on the left and right sides of the water tank, and then through the toilet holes on the left and right sides of the toilet seat, so that the bolt parts extend downward from the wall behind the toilet seat, and then use nuts to screw and lock, so as to achieve the effect of assembly and locking. For example, China's invention patent with authorization announcement number CN102713097B discloses a similar assembly structure.

[0003] There are some problems with the above-mentioned assembly structure and installation operation. First, since the long bolt cannot be firmly installed in the water tank perforation in advance and there is no positioning design to prevent deflection, once deflection occurs during the assembly process, it is difficult to accurately and quickly align with the toilet perforation, and it is also difficult to smoothly extend through it. If the operation is not careful, the long bolt may also be skewed or otherwise damaged due to collision, which will cause difficulties in assembly operation, especially for inexperienced or general consumers.

[0004] In addition, when the water tank and the toilet seat need to be disassembled and separated from each other for replacement or maintenance of related parts, once the nut is loosened, the waterproof gasket on the long bolt cannot be sealed to the bottom wall of the water tank. Therefore, in order to prevent water leakage during disassembly, the flushing water inside the water tank must be emptied first, which increases the difficulty of disassembly and is not conducive to the convenience of disassembly. Utility Model Content

[0005] The invention provides a locking device for a toilet seat and a water tank, including two locking components, the locking components including a water tank pre-installed component and a toilet nut; the water tank pre-installed component can be pre-installed and fixed at each water tank perforation of a water tank, and a screw-on portion is formed thereon, which can pass downward through the toilet perforation of a toilet seat, so that the toilet nut can be screwed and locked from below the toilet seat, thereby locking the water tank to the toilet seat. The screw-on portion can also only pass through the water tank perforation, and then a water tank bolt is screwed on the screw-on portion, and then the water tank bolt is used to pass downward through the toilet perforation and then lock the toilet nut, which can also lock the water tank to the toilet seat.

[0006] The locking device provided by the invention can facilitate quick installation by installers or consumers on site later, since the water tank pre-installed components can be pre-assembled in the factory, so as to improve the simplicity and efficiency of installation.

[0007] The locking device provided by the present invention utilizes a two-stage installation design of pre-installing the water tank pre-installation component on the water tank and then subsequently installing the toilet nut, or installing the water tank bolts and then installing the toilet nut. This can ensure that during the disassembly and separation operation of the water tank and the toilet seat, there is no need to empty the cleaning water inside the water tank. Only the toilet nut needs to be loosened and removed to smoothly disassemble and separate the two without worrying about water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a three-dimensional appearance diagram of the assembled state of the toilet and water tank of the first embodiment of this invention;

[0009] Figure 2 This is a three-dimensional exploded view of the toilet and water tank in the first embodiment of the present invention;

[0010] Figure 3 This is a partial side cross-sectional view of the toilet and water tank at the assembly position of the first embodiment of the invention;

[0011] Figure 4 for Figure 3 A partial enlarged view of the assembly position on the right;

[0012] Figure 5 This is a three-dimensional exploded view of the locking assembly of the first embodiment of the present invention;

[0013] Figure 6 A side cross-sectional view of the locking assembly of the first embodiment of the present invention;

[0014] Figure 7 Another side cross-sectional view of the locking assembly of the first embodiment of the present invention;

[0015] Figure 8 This is a bottom view of the water tank nut of the first embodiment of the present invention;

[0016] Fig. 9 This is a partial enlarged cross-sectional view of the water tank nut and the water tank in the first embodiment of the present invention in the assembled state along the cutting plane of the water tank nut;

[0017] Fig.10 A three-dimensional appearance diagram of two water tank nuts of the second embodiment of this invention;

[0018] Fig.11 for Fig.10 A bottom-view stereoscopic appearance diagram of

[0019] Fig.12A three-dimensional appearance diagram of a portion of the locking assembly of the second embodiment of the present invention installed in a water tank;

[0020] Fig.13 This is a three-dimensional exploded view of the locking assembly of the third embodiment of the present invention;

[0021] Fig.14 This is a partial side cross-sectional view of the toilet and water tank at the assembly position of the third embodiment of the present invention;

[0022] Fig.15 for Fig.14 A partial enlarged view of the assembly position on the right;

[0023] Fig.16 A side cross-sectional view of a locking assembly according to a third embodiment of the present invention;

[0024] Fig.17 This is another side cross-sectional view of the locking assembly of the third embodiment of the present invention.

[0025] Reference numerals:

[0026] 30. Locking assembly; 301. Water tank pre-installation assembly;

[0027] 31, toilet nut; 311, half screw thread;

[0028] 32. Water tank nut; 321. Stopping part; 322. Gripping part; 323. Penetrating part; 324. Elastic hook; 326. Cutting plane;

[0029] 33. Water tank bolt; 331. First bolt part; 332. Second bolt part; 333. Turning part; 335. Wing part; 336. Groove;

[0030] 34. Waterproof gasket; 341. Hole; 342. Cutting plane. DETAILED DESCRIPTION

[0031] like Figures 1 to 4 As shown, the invention provides a first embodiment of a locking device for a toilet seat and a water tank. The toilet seat 10 has a mounting wall 11 on the upper rear portion, and at least two toilet through-holes 12 are arranged on the mounting wall 11, such as two toilet through-holes 12 symmetrically arranged on the left and right. The water tank 20 has a bottom wall 21 inside, and at least two water tank through-holes 22 are arranged on the bottom wall 21, such as two water tank through-holes 22 symmetrically arranged on the left and right, respectively corresponding to the toilet through-holes 12; the locking device 300 includes two locking components 30, and the locking components 30 further include:

[0032] A water tank pre-assembled component 301, such as Figures 5 to 7As shown, it can be pre-sealed and locked to a corresponding water tank through hole 22 on the water tank 20, and a screw-fitting portion 302 is formed thereon, which can pass through a corresponding toilet through hole 12 on the toilet seat 10 from top to bottom.

[0033] A toilet nut 31 can be screwed and locked with the screw-in portion 302 of the water tank pre-assembly component 301 from below the installation wall 11 of the toilet seat 10 to install and fix the water tank 20 on the toilet seat 10.

[0034] Specifically, the water tank pre-assembly component 301 of the present embodiment includes: a water tank nut 32, which can be elastically buckled and limited to the water tank through-hole 22 from top to bottom; a water tank bolt 33, having a first bolt part 331, a second bolt part 332, and a turning part 333 connected to the first bolt part 331 and the second bolt part 332; used to rotate the turning part 333, the first bolt part 331 can be screwed into the water tank nut 32 from bottom to top, forcing the water tank nut 32 and the turning part 333 of the water tank bolt 33 to be clamped and tightened together on the bottom wall 21 of the water tank 20; the second bolt part 332 can be used to form the screwing part 302 of the water tank pre-assembly component 301.

[0035] In this embodiment, the water tank nut 32 has a stopper portion 321, a gripping portion 322 extending from the top of the stopper portion 321, a through portion 323 extending from the bottom of the stopper portion 321, at least two elastic hooks 324 extending from the bottom of the through portion 323, and a blind hole type screw hole 325 recessed upward from the bottom of the through portion 323; the stopper portion 321 can be used to stop and tighten against the bottom wall 21 of the water tank 20 at the water tank through hole 2 2; the penetration portion 323 can be extended into the water tank through hole 22; the elastic hook 324 can be elastically expanded after passing through the water tank through hole 22, and then the elastic buckle is limited to the lower surface 212 of the bottom wall 21 of the water tank 20 around the water tank through hole 22, so as to prevent the water tank nut 32 from axially disengaging from the water tank through hole 22 upward; the blind hole type screw hole 325 can allow the first bolt portion 331 of the water tank bolt 33 to extend upward and be screwed.

[0036] In this embodiment, two elastic hooks 324 are symmetrically arranged at the bottom end of the through portion 323 of the water tank nut 32, but the present invention is not limited thereto, and more than two elastic hooks 324 may also be arranged.

[0037] In this embodiment, the water tank bolt 33 includes a metal screw 33a and a plastic sleeve 33b integrally covering the middle part of the metal screw 33a; the first bolt part 331 and the second bolt part 332 are respectively formed at the two ends of the metal screw 33a, and a connecting protrusion 334 is formed between the first bolt part 331 and the second bolt part 332; the plastic sleeve 33b is integrally molded and covered on the connecting protrusion 334 to form the turning part 333, and the outer peripheral wall of the turning part 333 is symmetrically provided with two wings 335 for turning action.

[0038] In this embodiment, a groove 336 is integrally formed on the upper portion of the plastic assembly 33 b to provide an escape space for accommodating the elastic hooks 324 at the bottom end of the water tank nut 32 .

[0039] In this embodiment, if Figure 8 , Fig. 9 As shown, the water tank through hole 22 is a non-circular hole, for example, two opposite tangent planes 221 are formed on the inner hole wall. The through portion 323 of the water tank nut 32 is a non-circular cross section, for example, two opposite tangent planes 326 are formed on the outer peripheral wall, so that the through portion 323 can be nested and buckled in the water tank through hole 22 in a matching manner, and thus be restricted from rotating. The design that the through portion 323 can be nested and buckled in the water tank through hole 22 in a restricted rotation manner can prevent the water tank bolt 33 from being turned and actuated, so that when the first bolt portion 331 and the blind hole type screw hole 325 of the water tank nut 32 are screwed together, the water tank nut 32 will not produce idle rotation, which will facilitate the mutual screwing and fastening to the bottom wall 21 of the water tank 20.

[0040] In this embodiment, the water tank pre-assembly component 301 further includes a waterproof gasket 34, which has a non-circular sleeve hole 341 formed inside. For example, two opposite tangent planes 342 are formed on the inner hole wall, so that it can be nested on the through-hole 323 of the water tank nut 32 in a restricted rotation, and then be sealed and clamped between the lower surface 327 of the stopping part 321 of the water tank nut 32 and the upper surface 211 of the bottom wall 21 of the water tank 20 located around the water tank through-hole 22.

[0041] In this embodiment, the toilet nut 31 is a quick nut, for example, having two opposing and staggered half-threads 311, which can be quickly inserted and installed on the second bolt part 332 of the water tank bolt 33 at an appropriate tilt angle, and then by straightening, the half-thread 311 is screwed into the second bolt part 332. After that, the locking effect can be quickly achieved by slightly turning and tightening.

[0042] It should be noted that the quick nut belongs to known technology and is not the technical focus of this invention, so only a brief description is given. However, it is applied in this embodiment to effectively improve the assembly speed and efficiency. This is not limited to this, and traditional nuts can also be used, but there is a difference in assembly speed.

[0043] like Figures 10 to 12 As shown, the invention further provides a second embodiment of a locking device for a toilet seat and a water tank. The locking assembly 30 of this embodiment is substantially the same as that of the first embodiment, and the main difference is that:

[0044] In the present embodiment, the water tank nuts 320 of the two locking assemblies 30 are integrally connected to each other at a connecting portion 328 above their relative penetration portions 323, for example, between the two relative gripping portions 322, or between the two relative stopping portions 321, or between the two relative gripping portions 322 and the stopping portions 321; according to this design, the water tank nuts 320 can be restrained from each other, and thus are restricted from rotating and passing through the water tank through hole 22.

[0045] It can be easily understood that, due to the design of the connecting portion 328, the through portion 323 of each water tank nut 32 of this embodiment does not need to be provided with the cutting plane 326 of the first embodiment. Similarly, each water tank through hole 22 of the water tank 20 matched with this embodiment does not need to be provided with the cutting plane 221 of the first embodiment. However, the effect of preventing the water tank nut 32 from idling during the operation of being screwed and locked with the water tank bolt 33 can still be achieved.

[0046] The water tank nut 320 of this embodiment is configured with three elastic hooks 324 distributed at equal angles.

[0047] like Figures 13 to 15 As shown, the present invention provides a third embodiment of a locking device for a toilet seat and a water tank. The locking assembly 30a of this embodiment is similar to the locking assembly 30 of the first embodiment. Specifically, the locking assembly 30a of this embodiment includes:

[0048] A water tank pre-assembled component 303, such as Fig.16 , Fig.17 As shown, it can be pre-sealed and locked to a corresponding water tank through hole 22 on the water tank 20, and a threaded portion 304 is formed thereon.

[0049] A water tank bolt 35 has a holding portion 351 for holding and rotating, a first bolt portion 352 extending from the top of the holding portion 351, and a second bolt portion 353 extending from the bottom of the holding portion 351; because the holding portion 351 is rotated, the first bolt portion 351 can be screwed and fixed to the screwing portion 304 of the water tank pre-assembled component 303 from bottom to top; the second bolt portion 353 can pass through a relative toilet through-hole 12 on the toilet seat 10 from top to bottom.

[0050] A toilet nut 36 can be screwed and locked with the second bolt portion 353 of the water tank bolt 35 from below the installation wall 11 of the toilet seat 10 to install and fix the water tank 20 on the toilet seat 10.

[0051] Furthermore, the water tank pre-assembly component 303 of the present embodiment includes an upper water tank nut 37, which can extend from top to bottom and be positioned in the water tank through-hole 22, and has a coupling section 371 that passes through the water tank through-hole 22, and a threaded portion 304 of the water tank pre-assembly component 303 is formed on the upper water tank nut 371; and a lower water tank nut 38, which can be threaded into the coupling section 371 of the upper water tank nut 37, so that the lower water tank nut 38 and the upper water tank nut 37 can be locked and clamped together on the bottom wall 21 of the water tank 20.

[0052] In this embodiment, the upper water tank nut 37 has an upper stopper portion 372, an upper turning portion 373 extending from the top of the upper stopper portion 372 for turning and braking, a coupling section 371 extending from the bottom of the upper stopper portion 372, and a blind hole type screw hole 374 recessed upward from the bottom of the coupling section 371; the upper stopper portion 372 can be used to stop and tighten against the upper surface 211 of the bottom wall 21 of the water tank 20 located around the water tank through hole 22; the coupling section 371 is formed with a section of external screw thread 375; The blind hole screw hole 374 is used to form the threaded portion 304 of the water tank pre-assembly component 303; the lower water tank nut 38 has a lower stop portion 381, a lower turning portion 382 extending from the bottom end of the lower stop portion 381 and capable of being turned and depressed, and a screw hole 383 arranged inside the lower water tank nut 38; the lower stop portion 381 can be used to stop and tighten against the lower surface 212 of the bottom wall 21 of the water tank 20 located around the water tank through hole 22; the screw hole 383 can be screwed into the external thread 375 of the coupling section 371.

[0053] In this embodiment, the coupling section 371 of the upper water tank nut 37 has a through-section 376 connected to the upper stop portion 372, and an outer threaded section 377 connected to the through-section 376, which can be screwed and locked with the screw hole 383 of the lower water tank nut 38; the blind hole screw hole 374 has a through-section 378 relative to the interior of the coupling section 371, and a screw hole section 379 relative to the upper stop portion 372 and the upper turning portion 37 3 and connected to the perforated section 378; the screw hole section 379 is used to form the screw-fitting portion 304 of the water tank pre-assembly component 303; the first bolt portion 352 of the water tank bolt 35 has a set rod section 354 connected to the holding portion 351, and an external threaded segment 355 connected to the set rod section 354; the set rod section 354 is used to be inserted into the perforated section 378; the external threaded segment 355 is used to be screwed into the screw hole section 379.

[0054] In this embodiment, the water tank pre-assembly component 303 further includes a waterproof gasket 39, which can be inserted into the extension section 376 of the upper water tank nut 37, and then be sealed and clamped between the lower surface 370 of the upper stop portion 372 of the upper water tank nut 37 and the upper surface 211 of the bottom wall 21 of the water tank 20 located around the water tank through hole 22.

[0055] In this embodiment, the toilet nut 36 is a quick nut, for example, having two opposite and staggered half-screws 361, which can be quickly inserted and installed on the second bolt part 353 of the water tank bolt 35 at an appropriate tilt angle, and then the half-screws 361 are screwed into the second bolt part 353 by turning it straight, and then the locking effect can be quickly achieved by slightly turning and tightening it.

[0056] It should be noted that the quick nut belongs to known technology and is not the technical focus of this invention, so only a brief description is given. However, it is applied in this embodiment to effectively improve the assembly speed and efficiency. However, it is not limited to this and traditional nuts can also be used, but there is a difference in assembly speed.

[0057] It should be particularly noted that the design of the waterproof gaskets 34 and 39 of the above-mentioned embodiments can effectively prevent the flushing water in the water tank 20 from leaking downward to the outside through the gap between the water tank nut 32 and the bottom wall 21 of the water tank 20, or from the gap between the upper water tank nut 37 and the bottom wall 21 of the water tank 20.

[0058] In the above embodiments, Figures 2 to 4 ,as well as Fig.14 , Fig.15As shown, the installation wall 11 of the toilet seat 10 is provided with a water inlet hole 112; the bottom wall 21 of the water tank 20 is provided with a water drain hole 213; a water pipe assembly 40 is installed and connected between the water inlet hole 112 and the water drain hole 213. Preferably, the two locking components 30, 30a of the locking device 300 are symmetrically arranged on the left and right sides of the water pipe assembly 40.

[0059] Furthermore, the standard water pipe assembly 40 includes a drain pipe 41, a locking ring 42 and a sealing ring 43; the drain pipe 41 can be nested and positioned on the drain hole 213 from the inside of the water tank 20; the locking ring 42 can be screwed into the drain pipe 41 from below to lock the drain pipe 41 at the drain hole 213 of the water tank 20; the sealing ring 43 can be inserted upward and positioned at the bottom end of the drain pipe 41, and then be clamped and tightened between the conical inner hole wall of the water inlet hole 112 and the lower surface 212 of the bottom wall 21.

[0060] It can be easily understood that since the drain pipe 41 is nested and positioned on the drain hole 213 inside the water tank 20 and is located between the two locking components 30, 30a of the locking device 300, the connecting portion 328 formed between the water tank nuts 320 of the locking component 30 of the second embodiment must cross the drain pipe 41. Therefore, it is only necessary to design the connecting portion 328 in an arc shape, such as Fig.12 As shown, it can be smoothly accommodated in the space around the drain pipe 41 and the inner wall surface opposite to the water tank 20 without causing any obstacles in installation.

[0061] It should be noted that the water pipe group 40 belongs to known technology and is not the technical focus of this invention. The main purpose is to obtain the ideal and feasible configuration position of the locking component 30 based on the relative position relationship between the locking component 30 and the water pipe group 40.

[0062] Because of the description of the first embodiment above, it can be clearly understood that before the water tank 20 leaves the factory or is handed over to the consumer, the water tank pre-installed components 301 of the locking component 30 can be pre-installed on the water tank penetration holes 22 of the water tank 20. Therefore, before installing the water tank 20, the consumer only needs to lift the water tank 20, align the second bolt part 332 below the water tank bolt 33 on each water tank pre-installed component 301 with the toilet penetration holes 12 of the toilet seat 10, and then place it downward, so that each second bolt part 332 can be smoothly passed through each toilet penetration hole 12 downward. At this time, the toilet nut 31 is screwed and locked on each protruding second bolt part 332 from the bottom of the installation wall 11 of the toilet seat 10, so that the assembly operation of the water tank 20 and the toilet seat 10 can be easily and quickly completed.

[0063] The installation operation of the second embodiment is roughly the same as that of the first embodiment, with the only difference being that the two water tank nuts 320 on each water tank pre-installed component 301 of this embodiment are integrally connected, so that the two water tank nuts 320 can be installed and positioned on each water tank through-hole 22 from top to bottom in one operation, which can further simplify and speed up the operation process. Since such installation operations are usually performed before leaving the factory or before being handed over to consumers, for consumers, the installation operation of this embodiment is basically the same as that of the first embodiment.

[0064] Similarly, from the description of the third embodiment, it can be clearly understood that before assembling the water tank 20, the consumer can pre-install the water tank pre-installed components 303 of the locking component 30a on the water tank penetration holes 22 of the water tank 20 respectively. Therefore, before installing the water tank 20, the consumer only needs to screw and lock the first bolt parts 352 of the water tank bolts 35 into the blind screw holes 374 of the upper water tank nut 37 respectively, and then lift the water tank 20, align the second bolt parts 353 under each water tank bolt 35 with the toilet penetration holes 12 of the toilet seat 10, and then place it downward, so that each second bolt part 353 can be smoothly passed through each toilet penetration hole 12 downward. At this time, the toilet nut 36 is screwed and locked on each protruding second bolt part 353 from the bottom of the installation wall 11 of the toilet seat 10, so that the assembly operation of the water tank 20 and the toilet seat 10 can be easily and quickly completed.

[0065] It can be seen from the installation operation steps of the above-mentioned embodiments that the installer or consumer finally locks the toilet nuts 31, 36 from the bottom of the toilet seat 10. Therefore, this installation mode is generally referred to as "bottom-mounting", and can also be understood as a "bottom-locking" or "bottom-operating" installation mode in which the screws are locked from the bottom.

[0066] Since the water tank pre-assembly components 301, 303 of the above-mentioned embodiments can be pre-assembled in the factory, many installation operation processes can be greatly shortened. Therefore, the subsequent on-site installation operation by the installer or consumer is quite simple and fast, and it can also avoid the situation where people who lack assembly experience or general consumers have assembly difficulties.

[0067] As described above, since the water tank 20 is installed and fixed in front of the toilet seat 10, the water tank pre-installed components 301 of the first and second embodiments can be pre-installed and locked on each water tank penetration 22, and the water tank pre-installed components 303 of the third embodiment can also be pre-installed and locked on each water tank penetration 22, and then the water tank bolts 35 are locked. Therefore, it can be ensured that the water tank bolts 33 and 35 are stably in a central vertical state, which helps to accurately and quickly align with the toilet penetration 12 later, thereby effectively avoiding the water tank bolts 33 and 35 from being collided and caused to be skewed or other damage during the operation of placing the water tank 20 downward on the toilet seat 10.

[0068] The present invention adopts a two-stage installation operation design, that is, the water tank pre-installed components 301, 303 can be regarded as the first stage of installation operation. After completing the installation operation in this stage, the leakage-proof water sealing effect has been achieved, that is, it can ensure that the clean water in the water tank 20 will not leak out from between the water tank pre-installed components 301, 303 and the water tank perforation 22. Therefore, the subsequent installation operation of the toilet nut 31, or the water tank bolt 35 in combination with the toilet nut 36, all belong to the second stage of installation operation.

[0069] It can be easily understood that, by utilizing the above-mentioned two-stage installation operation design, when the installer or consumer wants to disassemble and separate the water tank 20 and the toilet seat 10, it is only necessary to disassemble a portion of the locking components 30, 30a, such as the toilet nut 31 of the first and second embodiments, or the toilet nut 36 of the third embodiment, to smoothly disassemble and separate the water tank 20 and the toilet seat 10 from each other without having to disassemble all of the locking components 30, 30a. Therefore, the portion of the locking components 30, 30a left in the water tank through-hole 22 can still be securely maintained in a locked state and a water-tight state that effectively prevents leakage without worrying about water leakage. Therefore, there is no need to empty the cleaning water inside the water tank 20, which also facilitates the disassembly and separation operation of the water tank 20 and the toilet seat 10, such as when replacing or repairing related components.

[0070] In summary, this invention has excellent practicality among similar products. At the same time, after searching relevant technical data or patent documents at home and abroad, no similar structure has been disclosed before. Therefore, this invention has already met the requirements of a new patent, and an application has been filed in accordance with the law. However, the above is only part of the feasible implementation examples of this invention. All equivalent structural changes made by applying the description of this invention and the scope of the patent application should be included in the patent scope of this invention.

Claims

1. A locking device for a toilet seat and a water tank, characterized in that: The toilet seat has a mounting wall on the upper rear part, and at least two toilet holes are arranged on the mounting wall; the water tank has a bottom wall inside, and at least two water tank holes are arranged on the bottom wall for being relative to the toilet holes; the locking device of the toilet seat and the water tank includes: A second locking assembly, the locking assembly includes a water tank pre-installed assembly, which can be pre-sealed and locked to a corresponding water tank through-hole on the water tank, and a screw-fitting portion is formed thereon, which can pass through a corresponding toilet through-hole on the toilet seat from top to bottom; The toilet nut can be screwed and locked with the screwed part of the water tank pre-installed component from below the installation wall of the toilet seat to install and fix the water tank on the toilet seat.

2. The locking device for a toilet seat and a water tank according to claim 1, characterized in that: The water tank pre-assembled components include: A water tank nut, which can be elastically buckled and locked in the water tank perforation from top to bottom; A water tank bolt has a first bolt part, a second bolt part, and a turning part connected to the first bolt part and the second bolt part, which is used to rotate the turning part so that the first bolt part can be screwed into the water tank nut from bottom to top, forcing the water tank nut and the turning part of the water tank bolt to be clamped and tightened against the bottom wall of the water tank; the second bolt part can be used to form the screwing part of the water tank pre-assembled component.

3. The locking device for a toilet seat and a water tank according to claim 2, characterized in that: The water tank nut has a stopping portion, a grasping portion extending from the top of the stopping portion, a penetration portion extending from the bottom of the stopping portion, at least two elastic hooks extending from the bottom of the penetration portion, and a blind hole type screw hole recessed upward from the bottom of the penetration portion; the stopping portion can be used to stop and tighten on the upper surface of the bottom wall of the water tank located around the water tank perforation; the penetration portion can be used to extend into the inside of the water tank perforation; the elastic hook can elastically expand after passing through the water tank perforation, and then the elastic buckle is limited to the lower surface of the bottom wall of the water tank located around the water tank perforation, so as to prevent the water tank nut from axially disengaging from the water tank perforation upward; the blind hole type screw hole can allow the first bolt portion of the water tank bolt to extend upward and be screwed.

4. The locking device for a toilet seat and a water tank according to claim 2, characterized in that: The water tank bolt includes a metal screw and a plastic kit integrally covering the middle part of the metal screw; the first bolt part and the second bolt part are respectively formed at the two ends of the metal screw, and a connecting protrusion is formed between the first bolt part and the second bolt part; the plastic kit is integrally molded and covered on the connecting protrusion to form the turning part, and the outer peripheral wall of the turning part is symmetrically provided with two wings that can be used for turning action.

5. The locking device for a toilet seat and a water tank according to claim 3, characterized in that: The water tank through hole is a non-circular hole; the through portion of the water tank nut has a non-circular cross section and can be extended and embedded in the water tank through hole in a limited rotation manner.

6. The locking device for a toilet seat and a water tank according to claim 3, characterized in that: The water tank pre-assembly component further includes a waterproof gasket, which has a non-circular sleeve hole formed inside, and can be nested in the through-hole of the water tank nut with limited rotation, and then be sealed and clamped between the lower surface of the stopping part of the water tank nut and the upper surface of the bottom wall of the water tank located around the through-hole of the water tank.

7. The locking device for a toilet seat and a water tank according to claim 3, characterized in that: Each water tank nut of the locking assembly is integrally connected to each other at a connecting portion above the relative penetration portion, so that each water tank nut can be restrained by each other and then restricted from rotating and passing through the water tank through hole.

8. The locking device for a toilet seat and a water tank according to claim 1, characterized in that: The toilet nut is a quick nut.

9. A locking device for a toilet seat and a water tank, characterized in that: The toilet seat has a mounting wall on the upper rear part, and at least two toilet holes are arranged on the mounting wall; the water tank has a bottom wall inside, and at least two water tank holes are arranged on the bottom wall for being relative to the toilet holes; the locking device of the toilet seat and the water tank includes: A second locking assembly, the locking assembly includes a water tank pre-installed assembly, which can be pre-sealed and locked to a corresponding water tank through-hole on the water tank, and has a screw-on portion formed thereon; A water tank bolt, comprising a gripping portion for gripping and rotating, a first bolt portion extending from the top of the gripping portion, and a second bolt portion extending from the bottom of the gripping portion, for turning the gripping portion so as to screw the first bolt portion from bottom to top and fix it to the screwing portion of the water tank pre-assembled component; the second bolt portion can pass through a toilet through hole on the toilet seat from top to bottom that is opposite to the toilet through hole; A toilet nut can be screwed and locked with the second bolt portion of the water tank bolt from below the installation wall of the toilet seat to install and fix the water tank on the toilet seat.

10. The locking device for a toilet seat and a water tank according to claim 9, characterized in that: The water tank pre-assembled components include: An upper water tank nut, which can extend from top to bottom and be positioned in the water tank through-hole, and has a coupling section that passes through the water tank through-hole, and a screwing part of the water tank pre-assembly component is formed on the upper water tank nut; A lower water tank nut can be screwed onto the coupling section of the upper water tank nut, so that the lower water tank nut and the upper water tank nut can be locked and clamped together on the bottom wall of the water tank.

11. The locking device for a toilet seat and a water tank according to claim 10, characterized in that: The upper water tank nut has an upper stop portion, an upper turning portion extending from the top of the upper stop portion for turning and braking, a connecting section extending from the bottom end of the upper stop portion, and a blind hole type screw hole recessed upward from the bottom end of the connecting section; the upper stop portion can be used to stop and tighten against the upper surface of the bottom wall of the water tank around the water tank through-hole; a section of external thread is formed on the connecting section; the blind hole type screw hole is used to form the threaded part of the water tank pre-assembled component; the lower water tank nut has a lower stop portion, a lower turning portion extending from the bottom end of the lower stop portion for turning and braking, and a screw hole arranged inside the lower water tank nut; the lower stop portion can be used to stop and tighten against the lower surface of the bottom wall of the water tank around the water tank through-hole; the screw hole can be screwed into the external thread of the connecting section.

12. The locking device for a toilet seat and a water tank according to claim 11, characterized in that: The combining section of the upper water tank nut has a through-stretching section connected to the upper stop portion, and an external threaded section connected to the through-stretching section, which can be screwed and locked with the screw hole of the lower water tank nut; the blind hole screw hole has a through-hole section relative to the interior of the combining section, and a screw hole section relative to the interior of the upper stop portion and the upper turning portion and connected to the through-hole section, and the screw hole section is used to form the screwing part of the water tank pre-assembly component; the first bolt part of the water tank bolt has a set rod section connected to the holding part, and an external threaded section connected to the sleeve rod section, the sleeve rod section is used to be inserted into the through-hole section, and the external threaded section is used to be screwed into the screw hole section.

13. The locking device for a toilet seat and a water tank according to claim 12, characterized in that: The water tank pre-assembly component further includes a waterproof gasket, which can be inserted into the extending section of the upper water tank nut, and then be sealed and clamped between the lower surface of the upper stop portion of the upper water tank nut and the upper surface of the water tank bottom wall located around the water tank through hole.

14. The locking device for a toilet seat and a water tank according to claim 9, characterized in that: The toilet nut is a quick nut.

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