A one-way backflow preventer for toilet flushing

Abstract

This utility model provides a one-way backflow preventer for toilet drainage, comprising: a main pipe having a vertically penetrating drainage channel with an inlet and an outlet on the upper and lower sides of the channel, respectively; a sealing cap pivotally connected to the outlet side and forming an automatic flipping structure for sealing the outlet; and a flexible sealing flange detachably connected to the inlet on the upper side of the main pipe for insertion into the drain pipe at the bottom of the toilet. This utility model combines a main pipe with a one-way sealing function with a flexible sealing flange, using the sealing flange to achieve a sealed connection with the drain pipe at the bottom of the toilet, while simultaneously using the one-way sealing of the sealing cap to achieve odor prevention. The overall structure is simple and easy to use, requiring no modification to the existing drainage pipes and toilet structure, and is easy to promote and popularize.

Description

Technical Field

[0001] This utility model relates to the technical field of bathroom drain fittings, and in particular to a one-way backflow preventer drain connector suitable for toilet sewage discharge. Background Technology

[0002] In people's daily lives, toilets are indispensable sanitary facilities, mainly divided into two categories: squat toilets and sit-down toilets. The odor-proof performance of their drainage system directly affects the quality of the indoor environment and the user experience. If the odor-proof effect is poor, foul odors can easily overflow from the sewer, affecting living comfort. At the same time, sewers, as dark and damp passages, easily become pathways for harmful organisms such as rats and cockroaches. These organisms can enter the house through the toilet drainpipe, not only spreading diseases but also causing great inconvenience to people's lives. Existing toilet structures also have significant shortcomings in preventing rats and cockroaches.

[0003] Currently, existing toilets typically rely solely on flange rings for sealing during installation. However, in practice, insufficient installation precision often compromises the reliability of the seal, leading to incomplete sealing. Furthermore, some straight-through squat toilets lack dedicated odor-prevention devices at the bottom, allowing odors to easily backflow from the drainpipe into the room, further exacerbating the backflow problem and facilitating the entry of rodents, cockroaches, and other pests.

[0004] To address the aforementioned odor backflow problem, those skilled in the art have developed unidirectional odor-preventing structures for toilet drain pipes. For example, Chinese patent document CN204959925U discloses a novel water-filled toilet. This technical solution modifies the lower part of the original toilet structure by adding a unidirectional sealing device with a sealing plate. Its working principle utilizes the weight of the water and the pressure within the pipe to open the sealing plate, thus enabling wastewater discharge. After discharge, the self-sealing function of the sealing plate blocks the upward flow of dirty water and odors, alleviating odor backflow during toilet discharge to a certain extent.

[0005] However, the aforementioned one-way sealing device has obvious limitations:

[0006] On the one hand, the device requires modification of the original toilet structure to achieve the one-way sealing function. The modification process is quite complicated, which not only increases the difficulty of construction but also increases the cost, which does not conform to the principle of economic efficiency.

[0007] On the other hand, for existing toilet drainage systems that are already in use, this solution, which requires modifying the original structure, is difficult to promote and popularize, and cannot meet the actual needs of large-scale improvement of the odor-proof performance of existing toilets.

[0008] In view of this, the inventor has designed a one-way backflow preventer for toilet flushing, which is the basis of this invention. Utility Model Content

[0009] To solve the above problems, the technical solution of this utility model is as follows:

[0010] A one-way backflow preventer for toilet flushing, comprising:

[0011] The main body has a vertically connected sewage discharge channel with an inlet and an outlet on the upper and lower sides of the sewage discharge channel, respectively.

[0012] A sealing cap, pivotally connected to one side of the water outlet and forming an automatic flipping structure, is used to seal the water outlet;

[0013] A flexible sealing flange is detachably connected to the inlet on the upper side of the main pipe for insertion into the drain pipe at the bottom of the toilet.

[0014] Preferably, the automatic flipping structure is a gravity-based or elastic-based flipping structure.

[0015] Preferably, the automatic flipping structure is a counterweight block located at one end of the rotating position of the sealing cap, the counterweight block being used to force the other end of the rotating position of the sealing cap to flip upwards to close the water outlet.

[0016] Preferably, one end of the rotating position of the sealing cover is provided with a counterweight chamber, and the counterweight block is movably disposed in the counterweight chamber.

[0017] Preferably, the water outlet is inclined, and the rotating position of the sealing cap is set on the higher side away from the bottom of the water outlet.

[0018] Preferably, the side wall of the main body is recessed inward near the lower end to form a clearance groove, which is used to accommodate the automatic flipping structure to prevent it from exceeding the maximum coverage area of ​​the main body on the horizontal plane during the flipping process.

[0019] Preferably, an attachment ring extends horizontally outward from the upper periphery of the main body, and the flexible sealing flange is annular to fit the attachment ring, with an annular connecting groove for the attachment ring to be embedded in its inner side.

[0020] Preferably, the flexible sealing flange has guide deformation ribs distributed around its periphery on its lower side, the outer ring of the guide deformation ribs forming an inclined guide wall surface, and the lower side of the guide wall surface facing the central axis of the flexible sealing flange.

[0021] Preferably, the upper side of the flexible sealing flange is integrally attached with an annular upper connecting wall, and the upper opening of the upper connecting wall extends inward to form a sealing reinforcement rib for strengthening the seal between the upper connecting wall and the drain pipe at the bottom of the toilet.

[0022] Preferably, the attachment ring has several through positioning grooves around its periphery, and the annular connecting groove has several structural reinforcing blocks that fit into the positioning grooves.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model combines a main pipe with a one-way sealing function with a flexible sealing flange. The sealing flange is used to achieve a sealed connection with the drain pipe opening at the bottom of the toilet. At the same time, the one-way sealing of the sealing cover is used to achieve the odor prevention function of the toilet. The overall structure is simple and easy to use, and there is no need to modify the original sewage pipes and toilet structure, making it easy to promote and popularize. Attached Figure Description

[0025] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0026] in:

[0027] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model;

[0028] Figure 2 This is a side view of Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the bottom structure of Embodiment 1 of this utility model;

[0030] Figure 4 This is a cross-sectional structural schematic diagram of Embodiment 1 of this utility model;

[0031] Figure 5 This is a cross-sectional view and a three-dimensional structural diagram of Embodiment 1 of this utility model;

[0032] Figure 6 This is one of the exploded structural diagrams of Embodiment 1 of this utility model;

[0033] Figure 7 This is the second exploded structural diagram of Embodiment 1 of this utility model;

[0034] Figure 8 This is an exploded and cross-sectional structural diagram of Embodiment 1 of this utility model;

[0035] Figure 9 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model;

[0036] Figure 10 This is a cross-sectional structural diagram of Embodiment 3 of this utility model.

[0037] Label Explanation:

[0038] 100. Main pipe; 110. Connecting section; 111. Arc-shaped connecting wall; 120. Drainage section; 130. Sewage discharge channel; 140. Inlet; 150. Outlet; 151. Step groove; 160. Reinforcing rib; 170. Attachment ring; 171. Positioning groove; 180. Clearance groove; 181. Hinge hole; 200. Sealing cap; 210. Hinge wall; 211. Hinge shaft; 220. Fittings 221. Counterweight chamber; 222. Buckle plate; 223. Observation slot; 224. Connecting rib; 230. Counterweight block; 300. Flexible sealing flange; 310. Annular connecting groove; 311. Structural reinforcing block; 320. Guide deformation rib; 321. Guide wall; 322. Annular groove; 400. Upper connecting wall; 410. Sealing reinforcement rib; 411. Reinforcing wall; 412. Deformation groove. Detailed Implementation

[0039] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model. Example 1

[0040] Please see Figures 1 to 5 This is a preferred embodiment of the present invention, a one-way backflow preventer for toilet drainage, comprising a main pipe body 100, a sealing cap 200, and a flexible sealing flange 300, with the following specific structure:

[0041] like Figure 1 , 2 As shown in Figure 4, the main pipe body 100 includes a connecting section 110 located at the upper part and a drainage section 120 located at the lower part. The connecting section 110 is bowl-shaped and has an arc-shaped connecting wall 111 distributed in a ring. The drainage section 120 extends downward along the bottom of the connecting section 110, thereby forming a through sewage channel 130 inside the main pipe body 100. An inlet 140 and an outlet 150 communicating with the sewage channel 130 are formed on the upper and lower sides of the main pipe body 100, respectively.

[0042] Among them, a number of reinforcing ribs 160 are integrally formed on the inner side wall of the arc-shaped connecting wall 111 and near the water inlet 140. The number of reinforcing ribs 160 extend vertically and are evenly distributed around the periphery of the water inlet 140. The upper end of the reinforcing ribs 160 extends to the end face of the water inlet 140.

[0043] Furthermore, such as Figure 4 , 6As shown, at the upper end of the connecting section 110 and located at the inlet 140, a ring-shaped attachment ring 170 extends horizontally outward in an integral manner. A number of positioning grooves 171 are evenly arranged on the attachment ring 170, penetrating the attachment ring 170. In this embodiment, the positioning grooves 171 are waist-shaped, and four sets of positioning grooves 171 are evenly distributed around the periphery of the attachment ring 170, with two adjacent positioning grooves 171 forming a group, thus serving as the connection basis between the attachment ring 170 and the sealing flange.

[0044] like Figure 4 , 5 As shown in Figure 7, the lower end of the drainage section 120 forms an inclined cut surface, and the inclination angle of the cut surface is preferably 50°-70°. In this embodiment, it is specifically 67°, thereby forming an inclined outlet 150 at the lower end of the drainage section 120. The inclined outlet 150 is used to facilitate the flip-up connection of the sealing cover 200.

[0045] Combination Figure 5 , 7 The side wall of the drainage section 120 near the higher side of the outlet 150 is recessed to form a relief groove 180. A set of hinge holes 181 are symmetrically formed on both sides of the relief groove 180, which serve as the hinge base for the sealing cover 200.

[0046] like Figure 6 , 7 As shown, in this embodiment, the inner bottom of the outlet 150 is recessed inward to form a stepped groove 151 for enhanced sealing. The sealing cover 200 is D-shaped, and its external shape is adapted to the stepped groove 151 to achieve a fitting with the stepped groove 151. On the straight side of the overall shape of the sealing cover 200, two hinged walls 210 are symmetrically and integrally formed. The two hinged walls 210 extend integrally from the bottom surface of the sealing cover 200, bypass the edge of its straight side, and extend to its top surface. At the position above, a set of hinge shafts 211 that fit into the hinge holes 181 are symmetrically and integrally formed on the side of the two hinge walls 210 that are far apart from each other. Thus, by using the hinge walls 210 that extend to the top surface of the sealing cover 200, when the sealing cover 200 is fully fitted into the stepped groove 151, its hinge shafts 211 can smoothly extend into the relief groove 180 and fit into the hinge holes 181, thereby realizing the hinged connection between the sealing cover 200 and the drainage section 120.

[0047] In addition, the clearance groove 180 is used to accommodate the automatic flipping structure to prevent it from exceeding the maximum coverage area of ​​the attachment ring 170 on the horizontal plane during the flipping process, thus avoiding interference between the sealing cover 200 and the surrounding structure when the cover flips, and allowing it to adapt to narrow installation spaces.

[0048] Furthermore, in order to enable the sealing cap 200 to automatically flip and close the outlet 150, an automatic flipping structure is provided at its hinge position.

[0049] like Figure 6 , 7 As shown in Figure 8, in this embodiment, the automatic flipping structure is a gravity-based flipping structure, which is implemented as follows:

[0050] First, a counterweight chamber 220 is integrally formed on the straight side of the overall shape of the sealing cover 200 and between the two hinge walls 210. The interior of the counterweight chamber 220 is hollow to form a counterweight cavity 221. The bottom of the counterweight chamber 220 is connected to a buckle plate 222 to open or close the counterweight cavity 221. The automatic flipping structure is a counterweight block 230 embedded in the counterweight cavity 221. Thus, the counterweight block 230 in the counterweight chamber 220 can press down on the sealing cover 200 under normal conditions by its own weight, causing the side of the sealing cover 200 close to the hinge shaft 211 to flip downward around the hinge shaft 211, thereby forcing the other side of the sealing cover 200 to flip up and embed into the stepped groove 151, sealing the outlet 150 and realizing the automatic sealing function of the main body 100 under normal conditions.

[0051] In this embodiment, the counterweight is preferably an iron block, but other items that can achieve the purpose of counterweight can also be used, and there is no limitation.

[0052] By using the stepped groove 151 to block the sealing cover 200, the entire main body 100 can also be sealed in one direction. At the same time, during the sewage discharge process, the force or gravity of the sewage can be used to press down the sealing cover 200 to open it, so that the sewage can be discharged smoothly into the sewage pipe inserted under the main body 100. After the sewage is discharged, the automatic flipping and sealing can also be achieved through the above process.

[0053] Thus, the optimized combination of counterweight 230 and sealing cover 200 ensures the stable operation of the one-way check function, and can reliably reset even when pipeline pressure fluctuates, extending service life and reducing maintenance requirements.

[0054] Furthermore, such as Figure 3 , 7 As shown, the side wall of the counterweight chamber 220 is provided with several hollow observation slots 223. The observation slots 223 are connected to the inner counterweight cavity 221. Thus, the observation slots 223 can be used to intuitively observe whether there is a counterweight block 230 in the counterweight cavity 221 during the production process, thereby improving the assembly efficiency.

[0055] In addition, several integrally connected ribs 224 are provided between the side wall of the counterweight chamber 220 and the bottom edge of the sealing cover 200. The connection between the counterweight chamber 220 and the sealing cover 200 is strengthened by the connecting ribs 224, which fully enhances its structural strength and extends its service life.

[0056] The above describes the implementation of the one-way sealing structure of the main pipe 100. The following describes the connection structure between the main pipe 100 and the drain pipe at the bottom of the toilet.

[0057] like Figure 5 , 8 As shown, the flexible sealing flange 300 is annular in shape to fit the attachment ring 170, and an annular connecting groove 310 is provided on the inner side of the annulus for the attachment ring 170 to be embedded. Thus, the cross-section of the entire flexible sealing flange 300 is C-shaped, so that the flexible sealing flange 300 can be embedded in its annular connecting groove 310.

[0058] In this embodiment, the flexible sealing flange 300 is made of silicone or TPE material, which enhances the sealing connection performance between the two when the drain pipe is inserted at the bottom of the toilet.

[0059] Preferred, such as Figure 5 As shown, the flexible sealing flange 300 has guide deformation ribs 320 distributed around its periphery on its lower side. The outer ring of the guide deformation ribs 320 forms an inclined guide wall surface 321, and the lower side of the guide wall surface 321 faces the central axis of the main body 100.

[0060] In this embodiment, the guide deformation rib 320 and the inner edge of the lower side wall of the flexible sealing flange 300 have a certain distance. After the connecting section 110 of the main body 100 is connected, the guide deformation rib 320 and the outer wall of the connecting section 110 will form an annular groove 322 with a lower opening and distributed around the periphery of the connecting section 110.

[0061] Therefore, by setting the guide deformation ribs 320, it can be adapted to sewage pipes of various diameters. For example, when attaching a smaller sewage pipe (such as a three-inch pipe), the pipe opening will be inserted into the annular groove 322, and a seal will be formed by compression between the pipe and the inner bottom of the annular groove 322. At this time, the guide deformation ribs 320 will deform due to contact with the ground, forming a secondary barrier and further enhancing the seal. Meanwhile, when attaching a larger sewage pipe (such as a four-inch pipe), the guide wall surface 321 will be exactly within the coverage area of ​​the sewage pipe. Its inclined surface will guide the entire installation process of the drain connector and the sewage pipe, and further seal the pipe by compressing and deforming it.

[0062] Preferred, such as Figure 4 , 8 As shown, an annular upper connecting wall 400 is integrally attached to the upper side of the flexible sealing flange 300. The upper opening of the upper connecting wall 400 extends inward to form a sealing reinforcement rib 410 for strengthening the seal between the upper connecting wall 400 and the drain pipe at the bottom of the toilet.

[0063] In this embodiment, the upper connecting wall 400 extends outwardly along the inner edge of the upper end wall of the flexible sealing flange 300, with an inclination angle preferably of 10° (not a limitation). A sealing reinforcing rib 410 is formed by extending horizontally and integrally towards the inner side of the top of the upper connecting wall 400. A reinforcing wall 411 is formed by extending downward along the inner side of the sealing reinforcing rib 410. A deformation groove 412 is formed by recessing the outer top of the sealing reinforcing rib 410 inward. Both the reinforcing wall 411 and the deformation groove 412 are annular and concentrically distributed with the sealing reinforcing rib 410.

[0064] Thus, by tightly fitting the sealing reinforcement rib 410 with the toilet drain pipe, and with the adaptive deformation capability of the guide deformation rib 320, the sealing reliability of the connection is greatly improved, avoiding the sealing problem caused by insufficient installation accuracy of traditional flange rings.

[0065] Preferred, such as Figure 8 As shown, the annular connecting groove 310 is provided with a number of structural reinforcing blocks 311 that fit into the positioning groove 171.

[0066] In this embodiment, the cross-section of the structural reinforcing block 311 is waist-shaped and fits into the positioning groove 171. The connection method at this location is as follows:

[0067] One method involves integrally molding the attachment ring 170 with rubber, making the structural reinforcing block 311 an integral part of the entire flexible sealing flange 300, and tightly fixing it to the attachment ring 170. This method provides the most secure connection.

[0068] One option is to fix one end of the structural reinforcing block 311 integrally with the annular connecting groove 310, while the other end is in a movable and separate state. This allows the flexible sealing flange 300 to be sleeved and fixed onto the attachment ring 170. Due to the elastic nature of the flexible sealing flange 300, a firm connection between the flexible sealing flange 300 and the attachment ring 170 can also be achieved, making this a secondary option. Example 2

[0069] As a unidirectional backflow preventer for toilet drainage, Embodiment 2 of this utility model differs from Embodiment 1 in that the automatic flipping structure is a spring-loaded flipping structure.

[0070] In this embodiment, the automatic flipping structure is a spring structure (not shown in the figure). One end of the spring presses the bottom of the relief groove 180, and the other end presses one end of the sealing cover 200, thereby pressing down one end of the rotating position of the sealing cover 200 by the elastic force so that the other end flips up to close the water outlet 150. Example 3

[0071] Please see Figure 9 , 10This is a one-way backflow preventer for toilet drainage, which is an embodiment 3 of this utility model. The difference between this embodiment and embodiment 1 is that it does not have an upper connecting wall 400.

[0072] Compared to Example 1, this implementation requires the application of putty or sealing wax rings to ensure a stable sealing connection between the flexible sealing flange 300 and the drain pipe at the bottom of the toilet.

[0073] In Example 1, the sealing reinforcement rib 410 of the upper connecting wall 400 is tightly fitted with the toilet drain pipe, which greatly improves the sealing reliability of the connection part, and there is no need to apply additional putty or sealing wax ring.

[0074] The beneficial effects of this utility model are as follows:

[0075] This utility model combines the main pipe 100 with a one-way sealing function with the flexible sealing flange 300. The sealing flange is used to achieve a sealed connection with the drain pipe opening at the bottom of the toilet. At the same time, the one-way sealing of the sealing cover 200 is used to achieve the odor prevention function of the toilet. The overall structure is simple and easy to use, and there is no need to modify the original sewage pipe and toilet structure, making it easy to promote and popularize.

[0076] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A one-way check sewer connector suitable for use in toilet drain, characterized in that, include: The main body (100) has a vertically connected sewage discharge channel (130), and the upper and lower sides of the sewage discharge channel (130) respectively form an inlet (140) and an outlet (150). A sealing cap (200) is pivotally connected to one side of the outlet (150) and forms an automatic flipping structure for sealing the outlet (150). A flexible sealing flange (300) is detachably connected to the inlet (140) on the upper side of the main pipe body (100) for inserting the drain pipe at the bottom of the toilet into the connection.

2. A one-way check sewer connector for use in toilet drain according to claim 1, wherein, The automatic flipping structure is a gravity-based or elastic-based flipping structure.

3. A one-way backflow preventer for toilet flushing as described in claim 2, characterized in that, The automatic flipping structure is a counterweight (230) located at one end of the rotating position of the sealing cover (200). The counterweight (230) is used to force the other end of the rotating position of the sealing cover (200) to flip up to close the outlet (150).

4. A one-way check sewer connector for use in toilet drain according to claim 3, wherein, The sealing cover (200) has a counterweight chamber (220) with a counterweight cavity (221) at one end of its rotating position, and the counterweight block (230) is movably disposed in the counterweight cavity (221).

5. A one-way check sewer connector for use in toilet drain according to claim 1, wherein, The outlet is inclined, and the rotating position of the sealing cover (200) is set on the higher side away from the bottom of the outlet.

6. A one-way check sewer connector for use in toilet drain according to claim 1, wherein, The side wall of the main body (100) is recessed inward near the lower end to form a relief groove (180), which is used to accommodate the automatic flipping structure to prevent it from exceeding the maximum coverage area of ​​the main body (100) on the horizontal plane during the flipping process.

7. A one-way check sewer connector for use in toilet drain according to claim 1, wherein, The upper periphery of the main body (100) extends outward with a horizontal attachment ring (170), and the flexible sealing flange (300) is annular to fit the attachment ring (170) and an annular connecting groove (310) is provided on its inner side for the attachment ring (170) to be embedded.

8. A one-way check trap drain fitting for use in toilet drain according to claim 7, wherein, The flexible sealing flange (300) is provided with guide deformation ribs (320) distributed around its periphery on the lower side. The outer ring of the guide deformation ribs (320) forms an inclined guide wall surface (321), and the lower side of the guide wall surface (321) faces the central axis of the flexible sealing flange (300).

9. A one-way backflow preventer for toilet flushing as described in claim 7, characterized in that, The upper side of the flexible sealing flange (300) is integrally attached with an annular upper connecting wall (400), and the upper opening of the upper connecting wall (400) extends inward to form a sealing reinforcement rib (410) for strengthening the sealing between the upper connecting wall (400) and the drain pipe at the bottom of the toilet.

10. A one-way check sewer connector for use in toilet drain according to claim 7, wherein, The attachment ring (170) has several through positioning grooves (171) around its periphery, and the annular connecting groove (310) has several structural reinforcing blocks (311) that fit into the positioning grooves (171).

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