Check valve type secondary drain

Abstract

The present invention discloses a check-type secondary drainer, including a connecting pipe. Wherein, a waterproof layer, a mortar layer, and a ceramic tile layer are sequentially laid from bottom to top on the ground, and a sewer pipe is installed in the ground. The upper end of the connecting pipe is communicated with a floor drain, and the lower end of the connecting pipe is inserted into the sewer pipe. A filter is sleeved on the upper end of the connecting pipe. The filter is located in the mortar layer, and the bottom surface of the filter is at the same horizontal plane as the top surface of the sewer pipe and the upper surface of the waterproof layer. Wherein, an anti-backflow and anti-gas device for preventing water and gas from flowing back is provided in the sewer pipe, and the anti-backflow and anti-gas device is located between the outer wall of the connecting pipe and the inner wall of the sewer pipe. The present invention has the advantages of being able to effectively drain the accumulated water in the mortar layer of the bathroom and prevent the backflow of water and gas, etc.

Description

Technical Field

[0001] The present invention relates to the field of drainage, and particularly to a check-type secondary drainer. Background Art

[0002] Currently, the floor of a bathroom generally has a three-layer structure, which from bottom to top are a waterproof layer, a mortar layer, and a ceramic tile layer. Traditional floor drains can drain the water on the ceramic tile layer into the sewer pipe. However, if there are gaps in the ceramic tiles, the water will flow into the mortar layer through the gaps to form accumulated water, and traditional floor drains cannot drain the accumulated water in the mortar layer. In the long run, the accumulated water will penetrate the floor and walls, thereby causing problems such as water seepage and mildew on the floor and walls.

[0003] To solve the problem of accumulated water in the bathroom mortar layer, a utility model patent with the patent number 201720652712.0 and the authorization publication date of May 4, 2018, and the patent name of "Drainer and Drainage System" discloses the following technology: A drainer solves the problem of accumulated water in the mortar layer by installing this drainer between the floor drain and the sewer pipe. However, the diameter of the drainer in this technology is relatively small, and it cannot match the commonly used sewer pipes and floor drains on the market at the same time, which is not conducive to promotion. Moreover, the drainer drains the accumulated water along the inner wall of the drainer pipe through the drain holes connecting the inside and outside of the drainer, and there is a problem that water and gas overflow back into the bathroom along the routes of the mortar layer and the ceramic tile gaps.

[0004] How to solve the above problems has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide a check-type secondary drainer that can effectively drain the accumulated water in the bathroom mortar layer and prevent the backflow of water and gas.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A check-type secondary drainer provided by the present invention includes a connecting pipe. Among them, a waterproof layer, a mortar layer, and a ceramic tile layer are sequentially laid on the ground from bottom to top, and a sewer pipe is installed in the ground. The upper end of the connecting pipe is communicated with the floor drain, and the lower end of the connecting pipe is inserted into the sewer pipe. A filter is sleeved on the upper end of the connecting pipe, and the filter is located in the mortar layer. The bottom surface of the filter is at the same horizontal plane as the top surface of the sewer pipe and the upper surface of the waterproof layer. Among them, an anti-backflow and anti-gas-backflow device for preventing water and gas from flowing back is provided in the sewer pipe, and the anti-backflow and anti-gas-backflow device is located between the outer wall of the connecting pipe and the inner wall of the sewer pipe.

[0008] Furthermore, the anti-backflow and anti-overflow device is installed at the lower end of the connecting pipe, and the outer wall of the anti-backflow and anti-overflow device is annular and matches the sewer pipe. The outer wall edge of the anti-backflow and anti-overflow device contacts and cooperates with the inner wall of the sewer pipe to seal the gap between the outer wall of the connecting pipe and the inner wall of the sewer pipe.

[0009] Furthermore, the anti-backflow and anti-overflow device includes a fixed sleeve and a convex ring horizontally arranged around the fixed sleeve and protruding towards the central axis of the fixed sleeve. The fixed sleeve is sleeved and installed at the lower end of the connecting pipe. The fixed sleeve extends outwards with a one-way horn ring. The one-way horn ring inclines downwards and forms an acute angle with the central axis of the fixed sleeve. The outer diameter of the bottom surface of the one-way horn ring is larger than the inner diameter of the sewer pipe, and the anti-backflow and anti-overflow device contacts and cooperates with the inner wall of the sewer pipe through the bottom edge of the annular outer wall of the one-way horn ring. Among them, the fixed sleeve, the one-way horn ring, and the convex ring are an integrally formed elastic rubber structure.

[0010] Furthermore, the connecting pipe is an integrally formed structure with a stepped diameter that gradually decreases from top to bottom, including an upper part of the connecting pipe, a middle part of the connecting pipe, a lower part of the connecting pipe, and an annular groove horizontally protruding inwards at the lower part of the connecting pipe. Among them, the upper part of the connecting pipe is communicated with the floor drain. The middle part of the connecting pipe, the lower part of the connecting pipe, and the groove are all located inside the sewer pipe. The inner diameter of the middle part of the connecting pipe is smaller than the outer diameter of the lower end of the floor drain, and the outer diameter of the middle part of the connecting pipe is smaller than the outer diameter of the upper part of the connecting pipe. The diameter of the lower part of the connecting pipe is smaller than the diameter of the middle part of the connecting pipe. The lower part of the connecting pipe is sleeved with the fixed sleeve, and the groove cooperates with the convex ring.

[0011] Furthermore, the filter is an integrally formed three-layer annular structure with a middle through hole, including an inner layer, a middle layer, and an outer layer. Among them, the inner layer is sleeved on the outside of the upper part of the connecting pipe, and four inverted L-shaped support feet arranged in a circular array around the central axis of the inner layer are provided at the bottom of the inner layer.

[0012] Furthermore, a middle-through annular cover for covering the top of the middle layer and the top of the outer layer is provided at the top of the filter. A filter screen with a pore diameter smaller than the diameter of the sand and gravel in the mortar layer is placed in the middle layer, and granular scale-proof material is placed in the outer layer.

[0013] Furthermore, the outer layer consists of several suspension frames arranged in a circular array around the central axis of the filter. The gap between each suspension frame is smaller than the diameter of the scale-proof material, and the bottom surface of the suspension frame is on the same horizontal plane as the upper surface of the waterproof layer.

[0014] Furthermore, the inner layer includes a sleeve body and a clamping ring that protrudes horizontally towards the inside of the inner layer. Among them, the sleeve body is sleeved on the outer side of the upper part of the connecting pipe, the clamping ring is fixedly connected to the bottom of the sleeve body, the inner diameter of the clamping ring is smaller than the inner diameter of the upper part of the connecting pipe and the inner diameter of the clamping ring is larger than the outer diameter of the middle part of the connecting pipe, and the bottom of the clamping ring is fixedly connected to the support feet.

[0015] Furthermore, the support feet include a horizontal body and a vertical body that are perpendicular to each other. The horizontal body is located between the clamping ring and the waterproof layer and the horizontal body is fixedly connected to the bottom of the clamping ring. The vertical body is located between the middle part of the connecting pipe and the sewer pipe and the upper end of the vertical body is fixedly connected to the end of the horizontal body close to the connecting pipe. The bottom surface of the horizontal body, the bottom surface of the suspension, the top surface of the sewer pipe, and the upper surface of the waterproof layer are all at the same horizontal plane.

[0016] Due to the adoption of the above structure, the beneficial effects of the present invention are as follows:

[0017] Through the filter installed in the mortar layer, the present invention can filter out the sand and gravel in the accumulated water of the mortar layer, and the bottom surface of the filter, the top surface of the sewer pipe, and the upper surface of the waterproof layer are all at the same horizontal plane. Thus, the accumulated water of the mortar layer that penetrates from the tile gap to the upper surface of the waterproof layer converges to the filter under the action of gravity and is discharged into the sewer pipe, thereby avoiding the problems of water seepage and mildew on the floor and wall caused by the accumulated water in the mortar layer. The anti-backflow device located between the outer wall of the connecting pipe and the inner wall of the sewer pipe can allow the accumulated water of the mortar layer to be discharged into the sewer pipe during normal drainage. However, when there is backwater or backgas, the bottom edge of the outer wall of the anti-backflow device will closely adhere to the inner wall of the sewer pipe, thus sealing the gap between the outer wall of the connecting pipe and the inner wall of the sewer pipe. Therefore, this anti-backflow device can prevent backwater and backgas, and prevent water and gas from flowing back to the bathroom along the gap between the connecting pipe and the sewer pipe, the mortar layer, and the tile gap. Therefore, the present invention can effectively drain the accumulated water in the mortar layer of the bathroom and prevent water and gas from flowing back.

[0018] Through the following description and in combination with the drawings, the present invention will become clearer. These drawings are used to explain the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the installation schematic diagram of the present invention;

[0021] Figure 2 Structural effect diagram of the present invention;

[0022] Figure 3 Cross-sectional view of the connecting pipe of the present invention;

[0023] Figure 4 Cross-sectional view of the filter of the present invention;

[0024] Figure 5 Cross-sectional view of the anti-backflow overflow device of the present invention. Specific implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1 to 5, a check-type secondary drain provided by the present invention includes a connecting pipe 1. Among them, a waterproof layer 1000, a mortar layer 2000, and a ceramic tile layer 3000 are sequentially laid from bottom to top on the ground. A sewer pipe 4000 is installed in the ground. The upper end of the connecting pipe 1 is communicated with a floor drain 5000, and the lower end of the connecting pipe 1 is inserted into the sewer pipe 4000. A filter 2 is sleeved on the upper end of the connecting pipe 1, and the filter 2 is located in the mortar layer 2000. The bottom surface of the filter 2, the top surface of the sewer pipe 4000, and the upper surface of the waterproof layer 1000 are all at the same horizontal plane. Under the action of gravity, the accumulated water in the mortar layer 2000 converges and flows into the filter 2, and after being filtered by the filter 2 to remove the sand and gravel in the accumulated water, it is discharged into the sewer pipe 4000, thereby avoiding the problems of floor and wall seepage and mildew caused by the accumulated water in the mortar layer 2000. Among them, an anti-backflow and anti-gas device 3 for preventing backwater and back-gas is provided in the sewer pipe 4000, and the anti-backflow and anti-gas device 3 is located between the outer wall of the connecting pipe 1 and the inner wall of the sewer pipe 4000. The bottom edge of the anti-backflow and anti-gas device 3 is in contact with the inner wall of the sewer 4000 in the natural state. When the accumulated water in the mortar layer 2000 flows down to the anti-backflow and anti-gas device 3 under the action of gravity, the outer wall edge of the anti-backflow and anti-gas device 3 will deform and shift, forming a gap allowing the accumulated water in the mortar layer 2000 to pass through between the anti-backflow and anti-gas device 3 and the inner wall of the sewer pipe 4000. After the accumulated water in the mortar layer 2000 passes through the anti-backflow and anti-gas device 3, the anti-backflow and anti-gas device 3 returns to the natural state. When backwater or back-gas occurs, the outer wall edge of the anti-backflow and anti-gas device 3 closely adheres to the inner wall of the sewer pipe 4000, and the greater the pressure of backwater or back-gas, the closer the outer wall edge of the anti-backflow and anti-gas device 3 fits with the inner wall of the sewer pipe 4000, thereby sealing the gap between the outer wall of the connecting pipe 1 and the inner wall of the sewer pipe 4000, and preventing water and gas from overflowing back into the bathroom along the gap between the connecting pipe 1 and the sewer pipe 4, the mortar layer 2000, and the ceramic tile gap.

[0027] In the present invention, the anti-backflow and anti-gas device 3 is installed at the lower end of the connecting pipe 1, and the outer wall of the anti-backflow and anti-gas device 3 is annular and matches the sewer pipe 4000. The outer wall edge of the anti-backflow and anti-gas device 3 is in contact and cooperation with the inner wall of the sewer pipe 4000 to seal the gap between the outer wall of the connecting pipe 1 and the inner wall of the sewer pipe 4000.

[0028] In the present invention, the anti-backflow and anti-overflow device 3 includes a fixed sleeve 31 and a convex ring 33 horizontally arranged around the fixed sleeve 31 and protruding towards the central axis of the fixed sleeve 31. The fixed sleeve 31 is sleeved and installed at the lower end of the connecting pipe 1. The fixed sleeve 31 extends outwards with a one-way horn ring 32. The one-way horn ring 32 slopes downwards and forms an acute angle with the central axis of the fixed sleeve 31. The outer diameter of the bottom surface of the one-way horn ring 32 is larger than the inner diameter of the sewer pipe 4000, and the anti-backflow and anti-overflow device 3 is in contact and cooperation with the inner wall of the sewer pipe 4000 through the bottom edge of the annular outer wall of the one-way horn ring 32. Among them, the fixed sleeve 31, the one-way horn ring 32 and the convex ring 33 are integrally formed elastic rubber structures. When draining the accumulated water in the mortar layer 2000, the bottom edge of the one-way horn ring 32 can deflect and deform towards the fixed sleeve 31 under the gravity of the water, so as to form a gap allowing the accumulated water in the mortar layer 2000 to pass through between the one-way horn ring 32 and the inner wall of the sewer pipe 4000. When there is backwater or back-gas, etc., the bottom edge of the one-way horn ring 32 has a tendency to deflect towards the sewer pipe 4000 under the pressure of the backwater or back-gas. However, due to the limitation of the diameter size of the sewer pipe 4000, the bottom edge of the one-way horn ring 32 is closely attached to the inner wall of the sewer pipe 4000, and the greater the pressure of the backwater or back-gas, the closer the bottom edge of the one-way horn ring 32 fits with the inner wall of the sewer pipe 4000, thereby sealing the gap between the outer wall of the connecting pipe 1 and the inner wall of the sewer pipe 4000 and playing a role in preventing backwater and back-gas.

[0029] In the present invention, the connecting pipe 1 has a structure with a stepped diameter that gradually decreases from top to bottom and is integrally formed, including an upper part 11 of the connecting pipe, a middle part 12 of the connecting pipe, a lower part 13 of the connecting pipe, and an annular groove 14 horizontally protruding inwards and provided in the lower part 13 of the connecting pipe. Among them, the upper part 11 of the connecting pipe is communicated with the floor drain 5000. The middle part 12 of the connecting pipe, the lower part 13 of the connecting pipe, and the groove 14 are all located in the sewer pipe 4000. The inner diameter of the middle part 12 of the connecting pipe is smaller than the outer diameter of the lower end of the floor drain 5000, and the outer diameter of the middle part 12 of the connecting pipe is smaller than the outer diameter of the upper part 11 of the connecting pipe. The diameter of the lower part 13 of the connecting pipe is smaller than the diameter of the middle part 12 of the connecting pipe. The lower part 13 of the connecting pipe is sleeved with the fixed sleeve 31, and the groove 14 is matched with the convex ring 33.

[0030] In the present invention, the filter 2 is a three-layer annular structure with a middle through-hole formed integrally, including an inner layer 21, a middle layer 22, and an outer layer 23. Among them, the inner layer 21 is sleeved on the outer side of the upper part 11 of the connecting pipe. Four inverted L-shaped supporting feet 24 arranged in a circumferential array around the central axis of the inner layer 21 are provided at the bottom of the inner layer 21. The supporting feet 24 form a gap allowing accumulated water to pass between the bottom of the inner layer 21 and the waterproof layer 1000. At the same time, the supporting feet 24 also form a gap allowing accumulated water to pass between the middle part 12 of the connecting pipe and the sewer pipe 4000.

[0031] In the present invention, a middle-through annular cover 4 for covering the top of the middle layer 22 and the top of the outer layer 23 is provided at the top of the filter 2. The annular cover 4 can confine the scale-proof material 6 inside the outer layer 23. A filter screen 5 with a pore diameter smaller than the diameter of the sand and gravel in the mortar layer 2000 is placed in the middle layer 22, which can filter out the sand and gravel in the accumulated water of the mortar layer 2000, thereby avoiding the loss of sand and gravel in the mortar layer 2000. Granular scale-proof material 6 is placed in the outer layer 23, which plays a role in inhibiting the generation of scale.

[0032] In the present invention, the outer layer 23 is composed of a plurality of suspension brackets 231 arranged in a circumferential array around the central axis of the filter 2. There is a gap allowing the accumulated water of the mortar layer 2000 to pass between the suspension brackets 231, and the gap between the suspension brackets 231 is smaller than the diameter of the scale-proof material 6. Therefore, the scale-proof material 6 can be confined inside the outer layer 23. The bottom surface of the suspension bracket 231 is on the same horizontal plane as the upper surface of the waterproof layer 1000.

[0033] In the present invention, the inner layer 21 includes a sleeve body 211 and a snap ring 212 protruding horizontally towards the inside of the inner layer 21. Among them, the sleeve body 211 is sleeved on the outer side of the upper part 11 of the connecting pipe. The snap ring 212 is fixedly connected to the bottom of the sleeve body 211. The inner diameter of the snap ring 212 is smaller than the inner diameter of the upper part 11 of the connecting pipe and the inner diameter of the snap ring 212 is larger than the outer diameter of the middle part 12 of the connecting pipe. Therefore, the connecting pipe 1 can be clamped, thereby preventing the connecting pipe 1 from sliding down. The bottom of the snap ring 212 is fixedly connected to the supporting feet 24, so that the bottom of the snap ring 212 does not come into contact with the sewer pipe 4000, forming a gap allowing the accumulated water of the mortar layer 2000 to pass.

[0034] In the present invention, the support leg 24 includes a horizontal body 241 and a vertical body 242 that are perpendicular to each other. The horizontal body 241 is located between the snap ring 212 and the waterproof layer 1000, and the horizontal body 241 is fixedly connected to the bottom of the snap ring 212, so that a gap allowing accumulated water to pass through is formed between the snap ring 212 and the waterproof layer 1000. The vertical body 242 is located between the middle part 12 of the connecting pipe and the sewer pipe 4000, and the upper end of the vertical body 242 is fixedly connected to the horizontal body 241 near one end of the connecting pipe 1. The inner side surface of the vertical body 242 is attached to the outer side surface of the middle part 12 of the connecting pipe, and the outer side surface of the vertical body 242 is attached to the inner side surface of the sewer pipe 4000, so that a gap allowing accumulated water to pass through is formed between the middle part 12 of the connecting pipe and the sewer pipe 4000, and at the same time, it also plays a role in restricting the horizontal displacement of the connecting pipe 1. The bottom surface of the horizontal body 241, the bottom surface of the suspension 231, the top surface of the sewer pipe 4000, and the upper surface of the waterproof layer 1000 are all in the same horizontal plane.

[0035] The present invention includes a connecting pipe 1 with its upper end connected to a floor drain 5000 and its lower end inserted into a sewer pipe 4000, a filter 2 sleeved on the upper part 11 of the connecting pipe, and an anti-backflow device 3 sleeved on the lower part 13 of the connecting pipe. When there is accumulated water in the mortar layer 2000, the accumulated water flows to the upper surface of the waterproof layer 1000 under the action of gravity and finally converges into the filter 2. The accumulated water in the mortar layer 2000 will flow from the gaps between the suspension arms 231 to the intermediate layer 22. After the sand and gravel in the accumulated water of the mortar layer 2000 are filtered out by the filter screen 5 placed in the intermediate layer 22, the accumulated water in the mortar layer 2000 flows from the gap between the bottom of the snap ring 212 and the waterproof layer 1000 to the space between the outer wall of the connecting pipe 12 and the inner wall of the sewer pipe 4000, and then falls onto the upper part of the anti-backflow device 3 made of elastic rubber under the action of gravity. The bottom edge of the one-way horn ring 32 deflects and deforms towards the fixed sleeve 31 side under the gravity of the water, so as to form a gap allowing the accumulated water in the mortar layer 2000 to pass between the one-way horn ring 32 and the inner wall of the sewer pipe 4000, and finally the accumulated water in the mortar layer 2000 is discharged into the sewer pipe 4000. Therefore, the present invention can effectively drain the accumulated water in the bathroom mortar layer 2000 and avoid the situation of floor and wall seepage and mildew caused by the continuous accumulation of water in the mortar layer 2000. The bottom edge of the one-way horn ring 32 is in contact with the inner wall of the sewer 4000 in the natural state. When there is backwater or backgas, etc., the bottom edge of the one-way horn ring 32 has a tendency to deflect towards the sewer pipe 4000 side under the pressure of backwater or backgas. However, due to the limitation of the diameter of the sewer pipe 4000, the bottom edge of the outer wall of the one-way horn ring 32 is closely attached to the inner wall of the sewer pipe 4000, and the greater the pressure of backwater or backgas, the closer the bottom edge of the outer wall of the one-way horn ring 32 fits with the inner wall of the sewer pipe 4000, so as to seal the gap between the outer wall of the connecting pipe 1 and the inner wall of the sewer pipe 4000, achieving the purpose of preventing water and gas from overflowing back into the bathroom along the gap between the connecting pipe 1 and the sewer pipe 4, the mortar layer 2000, and the tile gap. Therefore, the present invention can prevent water and gas from overflowing.

[0036] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments. The equipment and structures not described in detail should be understood to be implemented in a common way in the art. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A check-type secondary drainer, comprising a connecting pipe (1), wherein, A waterproof layer (1000), a mortar layer (2000), and a ceramic tile layer (3000) are sequentially laid from bottom to top on the ground. A sewer pipe (4000) is installed in the ground. The upper end of the connecting pipe (1) communicates with a floor drain (5000), and the lower end of the connecting pipe (1) is inserted into the sewer pipe (4000). It is characterized in that: a filter (2) is sleeved on the upper end of the connecting pipe (1), and the filter (2) is located in the mortar layer (2000). The bottom surface of the filter (2), the top surface of the sewer pipe (4000), and the upper surface of the waterproof layer (1000) are all at the same horizontal plane. Among them, an anti-backflow and anti-airback device (3) for preventing backflow of water and air is provided in the sewer pipe (4000), and the anti-backflow and anti-airback device (3) is located between the outer wall of the connecting pipe (1) and the inner wall of the sewer pipe (4000). The anti-backflow and anti-airback device (3) is installed at the lower end of the connecting pipe (1), and the outer wall of the anti-backflow and anti-airback device (3) is annular and matched with the sewer pipe (4000). The outer wall edge of the anti-backflow and anti-airback device (3) is in contact and cooperation with the inner wall of the sewer pipe (4000) to seal the gap between the outer wall of the connecting pipe (1) and the inner wall of the sewer pipe (4000).

2. The one-way secondary drainer according to claim 1, characterized in that: The anti-backflow and anti-airback device (3) includes a fixed sleeve (31) and a convex ring (33) horizontally arranged around the fixed sleeve (31) and protruding towards the central axis of the fixed sleeve (31). The fixed sleeve (31) is sleeved and installed at the lower end of the connecting pipe (1). The fixed sleeve (31) extends outwards with a one-way horn ring (32). The one-way horn ring (32) inclines downwards and forms an acute angle with the central axis of the fixed sleeve (31). The outer diameter of the bottom surface of the one-way horn ring (32) is larger than the inner diameter of the sewer pipe (4000), and the anti-backflow and anti-airback device (3) is in contact and cooperation with the inner wall of the sewer pipe (4000) through the bottom edge of the annular outer wall of the one-way horn ring (32). Among them, the fixed sleeve (31), the one-way horn ring (32), and the convex ring (33) are of an integrally formed elastic rubber structure.

3. The one-way secondary drain according to claim 2, characterized in that: The connecting pipe (1) is of an integrally formed structure with a stepped diameter that gradually decreases from top to bottom, including an upper connecting pipe part (11), a middle connecting pipe part (12), a lower connecting pipe part (13), and an annular groove (14) horizontally protruding inwards and provided in the lower connecting pipe part (13). Among them, the upper connecting pipe part (11) communicates with the floor drain (5000). The middle connecting pipe part (12), the lower connecting pipe part (13), and the groove (14) are all located in the sewer pipe (4000). The inner diameter of the middle connecting pipe part (12) is smaller than the outer diameter of the lower end of the floor drain (5000), and the outer diameter of the middle connecting pipe part (12) is smaller than the outer diameter of the upper connecting pipe part (11). The diameter of the lower connecting pipe part (13) is smaller than the diameter of the middle connecting pipe part (12). The lower connecting pipe part (13) is sleeved with the fixed sleeve (31), and the groove (14) is matched with the convex ring (33).

4. The one-way secondary drainer according to claim 3, characterized in that: The filter (2) is an integrally formed three-layer ring structure with a through middle, including an inner layer (21), a middle layer (22), and an outer layer (23). Among them, the inner layer (21) is sleeved on the outside of the upper part (11) of the connecting pipe, and four support feet (24) arranged in a circumferential array around the central axis of the inner layer (21) are provided at the bottom of the inner layer (21).

5. The check-type secondary drainer according to claim 4, wherein: A middle-through annular cover (4) for covering the top of the middle layer (22) and the top of the outer layer (23) is provided at the top of the filter (2). A filter screen (5) with a pore diameter smaller than the diameter of the sand and gravel in the mortar layer (2000) is placed in the middle layer (22), and a granular scale-proof material (6) is placed in the outer layer (23).

6. The one-way secondary drainer according to claim 5, characterized in that: The outer layer (23) is composed of a plurality of suspension brackets (231) arranged in a circumferential array around the central axis of the filter (2). The gap between the suspension brackets (231) is smaller than the diameter of the scale-proof material (6), and the bottom surface of the suspension brackets (231) is on the same horizontal plane as the upper surface of the waterproof layer (1000).

7. A check-type secondary drainer according to claim 4, characterized in that: The inner layer (21) includes a sleeve body (211) and a snap ring (212) protruding horizontally towards the inside of the inner layer (21). Among them, the sleeve body (211) is sleeved on the outside of the upper part (11) of the connecting pipe, the snap ring (212) is fixedly connected to the bottom of the sleeve body (211), the inner diameter of the snap ring (212) is smaller than the inner diameter of the upper part (11) of the connecting pipe and the inner diameter of the snap ring (212) is larger than the outer diameter of the middle part (12) of the connecting pipe, and the bottom of the snap ring (212) is fixedly connected to the support feet (24).

8. A check-type secondary drainer according to claim 7, characterized in that: The support feet (24) include a horizontal body (241) and a vertical body (242) that are perpendicular to each other. The horizontal body (241) is located between the snap ring (212) and the waterproof layer (1000) and the horizontal body (241) is fixedly connected to the bottom of the snap ring (212). The vertical body (242) is located between the middle part (12) of the connecting pipe and the sewer pipe (4000) and the upper end of the vertical body (242) is fixedly connected to one end of the horizontal body (241) close to the connecting pipe (1). The bottom surface of the horizontal body (241), the bottom surface of the suspension brackets (231), the top surface of the sewer pipe (4000), and the upper surface of the waterproof layer (1000) are all on the same horizontal plane.

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