Anti-backflow integrated drainage pipe fitting

Abstract

The utility model relates to an anti-backflow integrated drainage pipe fitting, which can be at least used for pipeline reconstruction in an existing building, and comprises an anti-backflow assembly, an anti-backflow pipe fitting, an anti-backflow pipe fitting and a one-way opening and closing piece, the anti-backflow assembly comprises a fluid channel, a non-return cavity and a one-way opening and closing piece, and the fluid channel is configured to be at least communicated with a transverse branch pipe or / and a transverse main pipe in the existing building; the non-return cavity is provided with an inlet and an outlet which are communicated with the fluid channel; the one-way opening and closing piece is arranged at the inlet and / or the outlet, and the one-way opening and closing piece is configured to be capable of opening or closing the inlet and the outlet in a one-way mode so that fluid in the fluid channel can only be guided to a drainage vertical pipe of the existing building from the transverse branch pipe or / and the transverse main pipe; the three-way pipe comprises a first connecting port, a second connecting port and a third connecting port, the first connecting port is communicated with the fluid channel, and the second connecting port and the third connecting port are configured to be at least communicated with a drainage vertical pipe of the existing building.

Description

Technical Field

[0001] The utility model relates to the technical field of building water supply and drainage, in particular to an anti-backflow integrated drainage pipe fitting. Background Art

[0002] At present, in the building drainage system, the water flow rate of the drainage riser is often greater than the water flow rate of the discharge horizontal pipe, and a positive pressure is formed at the bottom of the riser, which causes the water seal of the sanitary appliances on the lower floors (≤4 floors) to be destroyed, and bubbling and overflowing occur in the sanitary appliances.

[0003] Although the "Building Water Supply and Drainage Design Standard" (GB 50015-2019) proposes the minimum vertical distance between the bottom of the drainage riser and the lowest drainage branch or the connection between the drainage branch and the discharge pipe and the drainage horizontal branch through system optimization design, as well as "single row on the bottom floor" (that is, the lowest horizontal branch is discharged separately) and other regulations, in the actual construction and operation and maintenance process, sanitary appliances on the lower floors may bubble or overflow due to poor drainage or blockage of horizontal main pipes. This phenomenon is particularly serious in existing old residential areas. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide an integrated drainage pipe fitting with backflow prevention to solve the above problems.

[0005] The purpose of this utility model is mainly achieved through the following technical solutions:

[0006] The utility model provides an integrated drainage pipe fitting for backflow prevention, which can at least be used for pipeline reconstruction in existing buildings. The integrated drainage pipe fitting for backflow prevention includes:

[0007] The backflow prevention component comprises a fluid channel, a check cavity and a one-way opening and closing member, wherein the fluid channel is configured to be at least able to communicate with a horizontal branch pipe or / and a horizontal main pipe in an existing building; the check cavity is provided with an inlet and an outlet communicated with the fluid channel; the one-way opening and closing member is arranged at the inlet and / or the outlet, and the one-way opening and closing member is configured to be able to open or close the inlet and the outlet in one direction, so that the fluid in the fluid channel can only be guided from the horizontal branch pipe or / and the horizontal main pipe to the drainage riser of the existing building;

[0008] The three-way pipe comprises a first connection port, a second connection port and a third connection port, wherein the first connection port is connected to the fluid channel, and the second connection port and the third connection port are configured to be at least connected to the drainage riser of the existing building.

[0009] Further, the non-return cavity comprises an inclined side wall arranged obliquely downward, and the inclination angle of the inclined side wall is α, 30°≤α≤60°;

[0010] The inclined side wall is provided with the inlet;

[0011] The one-way opening and closing member is arranged at the inlet, the one-way opening and closing member is rotatably connected to the inclined side wall, and the one-way opening and closing member cooperates with the structure of the inclined side wall and the inlet;

[0012] Preferably, the rear cavity wall, the left cavity wall and the right cavity wall of the check cavity are arranged vertically downward;

[0013] The distance between the upper end of the inclined side wall and the rear cavity wall is greater than the distance between the lower end of the inclined side wall and the rear cavity wall;

[0014] Preferably, the bottom of the check cavity is in the shape of an arc.

[0015] Furthermore, the one-way opening and closing member includes a closed state and an open state;

[0016] When the one-way opening and closing member is in a closed state, the one-way opening and closing member fits against the inclined side wall to completely block the entrance;

[0017] When the one-way opening and closing member is in the open state, one end of the one-way opening and closing member is separated from the inclined side wall to open the entrance.

[0018] Furthermore, a sealing ring is provided on a side of the one-way opening and closing member that can be in contact with the inclined side wall;

[0019] When the one-way opening and closing member is in a closed state, the sealing ring surrounds the outer side of the inlet;

[0020] Preferably, at least one adapter is provided at the upper end of the one-way opening and closing member, and a rotating shaft matched with the adapter is provided on the inclined side wall.

[0021] Furthermore, the three-way pipe includes a straight pipe, the first connecting port is arranged on a side wall of the straight pipe, and the second connecting port and the second connecting port are respectively arranged at two ends of the straight pipe.

[0022] Furthermore, the outlet is connected to the first connection port via an inclined pipe arranged obliquely downward;

[0023] The angle between the inclined tube and the straight tube is β, 30°≤β≤60°;

[0024] Preferably, the backflow prevention component further comprises a water inlet pipe, one end of which is connected to the horizontal branch pipe or the horizontal main pipe, and the other end of which is connected to the inlet.

[0025] Furthermore, the shells of the oblique tube, the straight tube and the check chamber are integrally formed;

[0026] Alternatively, the oblique pipe, the straight pipe, the water inlet pipe and the outer shell of the check chamber are integrally formed.

[0027] Further, the backflow prevention assembly includes an inspection cover;

[0028] The access cover is configured to be able to open or close the non-return chamber.

[0029] Furthermore, the backflow prevention assembly further comprises a stopper, and the stopper is rotatably connected to the cavity wall of the check cavity;

[0030] The stopper includes a first rotation position and a second rotation position;

[0031] When the stopper is located at the first rotation position, the one-way opening and closing member can be switched between the open state and the closed state;

[0032] When the stopper is located at the second rotation position, the one-way opening and closing member is always in a closed state.

[0033] Further, the stopper comprises a rotating long shaft, a stopper portion and a toggle portion;

[0034] The rotating long axis passes through the left and right cavity walls of the check cavity and is rotationally connected to the left and right cavity walls of the check cavity;

[0035] The stopper is arranged at the center of the rotating long axis and is located in the non-return cavity;

[0036] The toggle portion is disposed at one end of the rotating long shaft and is located outside the outer shell of the check chamber;

[0037] The stopper and the toggle part rotate synchronously with the rotating long axis, and the stopper is switched between the first rotation position and the second rotation position by operating the toggle part;

[0038] Preferably, when the stopper is located at the first rotation position, the stopper abuts against the cavity top of the non-return cavity and does not affect the switching of the one-way opening and closing member between the open state and the closed state;

[0039] When the stopper is located at the second rotation position, the stopper abuts against the one-way opening and closing member, so that the one-way opening and closing member is always in close contact with the inclined side wall;

[0040] Preferably, a stop protrusion cooperating with the stop portion is provided on a side of the one-way opening and closing member away from the inclined side wall, and when the stop member is located at the second rotation position, the stop portion abuts against the stop protrusion.

[0041] Compared with the prior art, the utility model can achieve at least one of the beneficial effects: the integrated anti-backflow drainage pipe fittings can be arranged at the connection between the drainage riser and the horizontal main pipe on each floor of the building or / and the connection between the indoor drainage riser and the horizontal branch pipe. By setting the check cavity and the anti-backflow component, the fluid in the horizontal branch pipe or / and the horizontal main pipe can only flow in one direction toward the drainage riser, which is used to solve the bubbling and overflowing of wastewater from low buildings and the technical problem of drainage backflow on low floors. The modification is simple, the construction is convenient, and it is safe and reliable.

[0042] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0044] Figure 1 It is a structural schematic diagram of an integrated drainage pipe fitting for preventing backflow in a specific implementation manner;

[0045] Figure 2 It is a partial explosion diagram of the anti-backflow integrated drainage pipe fitting in a specific implementation method;

[0046] Figure 3 This is a schematic diagram of the structure of the integrated drainage pipe fitting for backflow prevention in a specific implementation method after the inspection cover is removed (I);

[0047] Figure 4 This is a schematic diagram of the structure of the integrated drainage pipe fitting for backflow prevention in a specific implementation manner after the inspection cover is removed (II).

[0048] Reference numerals:

[0049] 1-anti-backflow assembly; 101-check chamber; 102-inlet; 103-outlet; 11-one-way opening and closing member; 111-adapter; 112-stop protrusion; 12-water inlet pipe; 13-housing; 131-inspection cover; 14-stop member; 141-rotating long axis; 142-stop part; 142-sliding part; 2-tee pipe; 201-first connecting port; 202-second connecting port; 203-third connecting port; 21-straight pipe; 22-oblique pipe. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0051] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection can be a mechanical connection, or an electrical connection can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0053] The common working surface of the utility model can be a plane or a curved surface, can be inclined, or can be horizontal. For the convenience of description, the embodiment of the utility model is placed on a horizontal plane and used on the horizontal plane, and "high and low" and "up and down" are defined in this way.

[0054] A specific embodiment of the utility model discloses an anti-backflow integrated drainage pipe fitting, which can at least be used for pipeline reconstruction in existing buildings, such as Figure 1 to Figure 4 As shown, the anti-backflow integrated drainage pipe fitting comprises:

[0055] The backflow prevention component 1 comprises a fluid channel, a check chamber 101 and a one-way opening and closing member 11, wherein the fluid channel is configured to be able to communicate with at least a horizontal branch pipe or / and a horizontal main pipe in an existing building; the check chamber 101 is provided with an inlet 102 and an outlet 103 communicated with the fluid channel; the one-way opening and closing member 11 is arranged at the inlet 102 and / or the outlet 103, and the one-way opening and closing member 11 is configured to be able to open or close the inlet 102 and the outlet 103 in one direction, so that the fluid in the fluid channel can only be guided from the horizontal branch pipe or / and the horizontal main pipe to the drainage riser of the existing building;

[0056] The three-way pipe 2 includes a first connection port 201, a second connection port 202 and a third connection port 203. The first connection port 201 is connected to the fluid channel, and the second connection ports 202 and 203 are configured to be at least connected to the drainage riser of the existing building.

[0057] The check chamber 101 is located on the necessary path of the fluid channel and constitutes a part of the fluid channel.

[0058] The utility model provides an integrated drainage fitting for backflow prevention (hereinafter referred to as drainage fitting) which can be arranged at the connection between the vertical drainage pipe and the horizontal main pipe on each floor of the building or / and at the connection between the vertical drainage pipe and the horizontal branch pipe in the room. By setting the check chamber 101 and the backflow prevention component 1, the fluid in the horizontal branch pipe or / and the horizontal main pipe can only flow in one direction toward the vertical drainage pipe, thereby solving the problem of bubbling and overflowing of wastewater from low buildings and solving the technical problem of drainage backflow on low floors. The utility model has the advantages of simple transformation, convenient construction, safety and reliability.

[0059] It should be noted that the drainage pipe fittings of the utility model can be used not only for the renovation of drainage pipes of existing buildings, but also for the drainage system of new buildings. When it is used for the renovation of drainage pipes of existing buildings, the old three-way pipe fittings connecting the drainage riser and the horizontal main pipe or / and the horizontal branch pipe are replaced with the drainage pipe fittings of the utility model. The renovation process is simple and convenient, and no major changes to the drainage system are required.

[0060] According to a preferred embodiment of the present invention, the check chamber 101 includes an inclined side wall arranged obliquely downward, and the inlet 102 is provided on the inclined side wall.

[0061] Since the direction of the fluid in the check chamber 101 is from the inlet 102 to the outlet 103, and the inlet 102 and the outlet 103 are preferably arranged on opposite side walls, the inclined side wall is the front wall of the check chamber, and the side wall with the outlet 103 is the rear wall of the check chamber.

[0062] To facilitate the smooth flow of fluid in the check chamber 101, the rear wall, left wall and right wall of the check chamber 101 are arranged vertically downward. The distance between the upper end of the inclined side wall and the rear wall is greater than the distance between the lower end of the inclined side wall and the rear wall. Preferably, the bottom of the check chamber 101 is in an arc shape, that is, the bottom of the chamber transitions from the arc of the left wall to the right wall.

[0063] Preferably, the inclination angle of the oblique side wall is α (ie, the angle between the oblique side wall and the vertical plane, that is, the angle between the oblique side wall and the left cavity wall / right cavity wall), 15°≤α≤75°. Further, α=60°.

[0064] The one-way opening and closing member 11 is disposed at the entrance 102, and the one-way opening and closing member 11 is rotatably connected to the oblique side wall to open or close the entrance 102. Specifically, the one-way opening and closing member includes a closed state and an open state. When the one-way opening and closing member is in the closed state, the one-way opening and closing member fits with the oblique side wall to completely block the entrance; when the one-way opening and closing member is in the open state, one end of the one-way opening and closing member is separated from the oblique side wall to open the entrance.

[0065] With such a configuration, when there is fluid flowing in the fluid channel, the one-way opening and closing member 11 opens the inlet 102 under the thrust of the fluid, and the fluid flows from the inlet 102 through the non-return chamber 101 and enters the three-way pipe from the outlet 103 and is guided away by the drainage riser. When there is no fluid flowing in the fluid channel, the one-way opening and closing member 11 closes the inlet 102 by its own gravity against the oblique side wall, which can prevent the smell of the fluid in the drainage riser from spreading into the resident's room through the inlet 102, thus playing a role in preventing odor. When the fluid in the drainage riser flows back into the non-return chamber 101, applying fluid thrust to the one-way opening and closing member 11 will only make the one-way opening and closing member 11 fit more closely with the oblique side wall, and will not open the inlet 102 to allow the fluid to flow back to the horizontal branch pipe or horizontal main pipe, thus preventing the occurrence of drainage backflow.

[0066] Preferably, the upper end of the one-way opening and closing member 11 is rotatably connected to the inclined side wall, and the lower end of the one-way opening and closing member is a free end that changes position as it rotates.

[0067] At least one adapter 111 is provided at the upper end of the one-way opening and closing member 11, and a rotating shaft (not shown in the figure) adapted to the adapter is provided on the inclined side wall. Exemplarily, the shape of the adapter 111 is similar to an inverted "U" shape, one end of the adapter 111 is rotatably connected to the rotating shaft, and the other end of the adapter 111 is fixedly connected to the one-way opening and closing member 11.

[0068] In this embodiment, two adapters 111 are symmetrically provided on the upper end of the one-way opening and closing member 11. A long axis can be provided on the inclined side wall to be rotatably connected to the two adapters at the same time, or two short axes can be provided to respectively cooperate with the two adapters.

[0069] It should be noted that the rotational connection between the one-way opening and closing member 11 and the inclined side wall is not limited to the above-mentioned adapter and rotating shaft. Any structure that can achieve the rotational connection between the two is acceptable, illustratively, also including hinge structures, articulated structures, hinge structures, etc.

[0070] The one-way opening and closing member 11 cooperates with the structure of the oblique side wall and the inlet 102, and can at least meet the requirement that it can be tightly attached to the oblique side wall to completely cover the inlet 102. In this embodiment, the inlet 102 is a round opening, and the one-way opening and closing member 11 is a round cover with a certain thickness. The diameter of the one-way opening and closing member 11 is greater than the diameter of the inlet 102 to ensure that the one-way opening and closing member 11 can cover and close the inlet 102.

[0071] The side of the one-way opening and closing member 11 that is in contact with the inclined side wall is an inclined surface that matches the inclination angle of the inclined side wall.

[0072] In order to improve the sealing effect of the one-way opening and closing member 11 on the inlet 102, a sealing ring is provided on the side of the one-way opening and closing member that can be in contact with the inclined side wall. When the one-way opening and closing member is in a closed state, the sealing ring is arranged around the outside of the inlet, further improving the anti-odor and anti-backflow effects of the drainage pipe. The material of the sealing ring has a certain elasticity. For example, the material of the sealing ring is silicone seal or rubber, which has good corrosion resistance and oxidation resistance.

[0073] The backflow prevention component 1 also includes a water inlet pipe 12, one end of which is connected to a horizontal branch pipe or a horizontal main pipe, and the other end of the water inlet pipe 12 is connected to the inlet 102 to facilitate connection with the branch pipe or the horizontal main pipe, thereby improving the connection performance of the drainage pipe fittings.

[0074] Of course, the backflow prevention assembly 1 includes a housing 13 for forming a check cavity 101, an inlet 102 and an outlet 103 are provided on the front side wall and the rear side wall of the housing 13, and the oblique side wall of the check cavity 101 is located inside the housing. The inlet 102 extends from the front side wall of the housing to the oblique side wall of the check cavity and communicates with the check cavity, and the outlet 103 extends from the rear cavity wall of the check cavity to the rear side wall of the housing. Preferably, the center lines of the inlet 102 and the outlet 103 coincide.

[0075] Preferably, the space enclosed by the front side wall, top wall, bottom wall of the housing 13 and the oblique side wall of the check chamber 101 (excluding the space occupied by the inlet 102) is solid to ensure the structural stability of the backflow prevention assembly.

[0076] To facilitate the early assembly and later maintenance of drainage pipe fittings, the backflow prevention assembly 1 includes an inspection cover 131, which is configured to open or close the check chamber 101, that is, the shell 13 is provided with a detachable top cover (i.e., the inspection cover 131).

[0077] According to a preferred embodiment of the utility model, the anti-backflow assembly 1 further includes a stopper 14, which is rotatably connected to the cavity wall of the check cavity 101. The stopper 14 includes a first rotation position and a second rotation position. When the stopper 14 is in the first rotation position, the one-way opening and closing member 11 can switch between an open state and a closed state; when the stopper 14 is in the second rotation position, the one-way opening and closing member 11 is always in a closed state. With such a configuration, when the resident is at home, the stopper 14 can be kept in the first rotation position to ensure normal drainage; when the resident is away from home for a long time, the stopper 14 can be kept in the second rotation position to prevent the sewage in the drainage riser from flowing back into the room.

[0078] Specifically, the stopper 14 includes a rotating long shaft 141, a stopper 142 and a toggle part 143. The rotating long shaft passes through the left and right cavity walls of the check cavity and is rotatably connected to the left and right cavity walls of the check cavity. The stopper 142 is arranged at the center of the rotating long shaft 141 and is located in the check cavity. The toggle part 143 is arranged at one end of the rotating long shaft (at least one end of the rotating long shaft passes through the left cavity wall or the right cavity wall to leak out), and is located outside the shell of the check cavity.

[0079] Preferably, the two ends of the rotating long axis are respectively passed through the left cavity wall and the right cavity wall to be exposed, that is, the two ends of the rotating long axis are located outside the shell, and one end exposed to the outside is provided with a toggle portion 143, so that the user can switch the stopper 14 between the first rotation position and the second rotation position through the toggle portion 143. The other end exposed to the outside is provided with a fixing protrusion to improve the connection stability between the stopper 14 and the shell 3, and prevent the rotating long axis 141 from slipping off the cavity wall of the check cavity.

[0080] The stopper 142 and the toggle part 143 rotate synchronously with the rotating long axis 141 , and the stopper 14 can be switched between the first rotation position and the second rotation position by operating the toggle part 142 .

[0081] When the stopper 14 is in the first rotation position, the stopper 142 abuts against the cavity top (i.e., the inspection cover) of the non-return cavity, and does not affect the switching of the one-way opening and closing member 11 between the open state and the closed state. When the stopper 14 is in the second rotation position, the stopper 142 abuts against the one-way opening and closing member 11 so that it is always in close contact with the inclined side wall to ensure that it is always in the closed state.

[0082] Preferably, a side of the one-way opening and closing member 11 away from the inclined side wall is provided with a stop protrusion 112 that cooperates with the stop portion 142. When the stop member 14 is in the second rotation position, the stop portion 142 abuts against it to improve the abutment strength between the one-way opening and closing member 11 and the stop member 14, ensuring that the one-way opening and closing member 11 is always in a closed state.

[0083] According to an embodiment of the present invention, the three-way pipe 2 includes a straight pipe 21, the first connecting port 201 is arranged on the side wall of the straight pipe 21, and the second connecting port 102 and the second connecting port 103 are respectively arranged at two ends of the straight pipe.

[0084] In order to improve the anti-backflow effect of the drainage pipe, the outlet 103 is connected to the first connection port 201 through an inclined pipe 22 arranged obliquely downward to increase the resistance of the fluid during diversion (the resistance generated by the fluid's own gravity). Preferably, the angle between the inclined pipe 22 and the straight pipe 21 is β, 30°≤β≤60°. In this embodiment, β=45°.

[0085] In order to improve the structural strength and drainage stability of the drainage pipe, the inclined pipe 22, the straight pipe 21 and the shell 13 of the check chamber 101 are integrally formed. Alternatively, the inclined pipe 22, the straight pipe 21, the water inlet pipe 12 and the shell 13 of the check chamber 101 are integrally formed. The integral forming refers to integral injection molding.

[0086] The shape of the shell is selected according to actual conditions, and it is only required that the above-mentioned non-return cavity can be formed inside it. In this embodiment, the front side wall, rear side wall, left side wall and right side wall of the shell are all arranged vertically, the inspection cover is arranged horizontally, and the bottom wall is an arc shape (that is, the left side wall is arc-shaped and transitions to the bottom wall of the right side wall). The water inlet pipe is vertically connected to the front side wall of the shell, one end of the inclined tube is connected to the rear side wall of the shell, and the other end of the inclined tube is connected to the straight pipe side wall.

[0087] All pipes coming out of the building's drainage equipment (washing machines, showers, toilets, etc.) are connected to the sewer pipes. If heavy rain fills up the sewer pipes or the sewer pipes are blocked, wastewater will flow back and flood the basement facilities and furniture, causing huge financial losses and time consumption. The utility model's anti-backflow integrated drainage pipe fittings can protect the drainage points in the room below the backflow water level from bubbling, overflowing, etc. At the same time, in the renovation of existing buildings, the pipe fittings can be installed at the connection between the drainage riser and the horizontal branch pipe on the lower floors to effectively ensure the safety of the drainage system.

[0088] The utility model discloses an integrated drainage pipe fitting for backflow prevention, which can directly replace the existing three-way pipe fitting when used for pipe reconstruction of existing buildings, thereby reducing on-site assembly work and improving reconstruction construction efficiency.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated drainage pipe fitting for backflow prevention, characterized in that: At least it can be used for pipeline reconstruction in existing buildings. The integrated drainage pipes for backflow prevention include: The backflow prevention component comprises a fluid channel, a check cavity and a one-way opening and closing member, wherein the fluid channel is configured to be at least able to communicate with a horizontal branch pipe or / and a horizontal main pipe in an existing building; the check cavity is provided with an inlet and an outlet communicated with the fluid channel; the one-way opening and closing member is arranged at the inlet and / or the outlet, and the one-way opening and closing member is configured to be able to open or close the inlet and the outlet in one direction, so that the fluid in the fluid channel can only be guided from the horizontal branch pipe or / and the horizontal main pipe to the drainage riser of the existing building; The three-way pipe comprises a first connection port, a second connection port and a third connection port, wherein the first connection port is connected to the fluid channel, and the second connection port and the third connection port are configured to be at least connected to the drainage riser of the existing building.

2. The backflow prevention integrated drainage pipe fitting according to claim 1, characterized in that: The non-return cavity comprises an inclined side wall arranged obliquely downward, and the inclined angle of the inclined side wall is α, 30°≤α≤60°; The inlet is provided on the inclined side wall; The one-way opening and closing member is arranged at the inlet, the one-way opening and closing member is rotatably connected to the inclined side wall, and the one-way opening and closing member cooperates with the structure of the inclined side wall and the inlet.

3. The backflow prevention integrated drainage pipe fitting according to claim 2, characterized in that: The rear cavity wall, the left cavity wall and the right cavity wall of the non-return cavity are arranged vertically downward; The distance between the upper end of the inclined side wall and the rear cavity wall is greater than the distance between the lower end of the inclined side wall and the rear cavity wall.

4. The backflow prevention integrated drainage pipe fitting according to claim 3, characterized in that: The bottom of the check cavity is in an arc shape.

5. The backflow prevention integrated drainage pipe fitting according to claim 2, characterized in that: The one-way opening and closing member includes a closed state and an open state; When the one-way opening and closing member is in a closed state, the one-way opening and closing member fits against the inclined side wall to completely block the entrance; When the one-way opening and closing member is in the open state, one end of the one-way opening and closing member is separated from the inclined side wall to open the entrance.

6. The backflow prevention integrated drainage pipe fitting according to claim 5, characterized in that: A sealing ring is provided on a side of the one-way opening and closing member that can be in contact with the inclined side wall; When the one-way opening and closing member is in a closed state, the sealing ring surrounds the outer side of the inlet.

7. The backflow prevention integrated drainage pipe fitting according to claim 6, characterized in that: At least one adapter is provided at the upper end of the one-way opening and closing member, and a rotating shaft matched with the adapter is provided on the inclined side wall.

8. The backflow prevention integrated drainage pipe fitting according to claim 1, characterized in that: The three-way pipe includes a straight pipe, the first connecting port is arranged on the side wall of the straight pipe, and the second connecting port and the second connecting port are respectively arranged at two ends of the straight pipe.

9. The backflow prevention integrated drainage pipe fitting according to claim 8, characterized in that: The outlet is connected to the first connection port via an inclined pipe arranged obliquely downward; The included angle between the inclined tube and the straight tube is β, 30°≤β≤60°.

10. The backflow prevention integrated drainage pipe fitting according to claim 9, characterized in that: The backflow prevention component also includes a water inlet pipe, one end of which is connected to the horizontal branch pipe or the horizontal main pipe, and the other end of which is connected to the inlet.

11. The backflow prevention integrated drainage pipe fitting according to claim 10, characterized in that: The shells of the oblique tube, the straight tube and the check chamber are integrally formed; Alternatively, the oblique pipe, the straight pipe, the water inlet pipe and the outer shell of the check chamber are integrally formed.

12. The backflow prevention integrated drainage pipe fitting according to any one of claims 1 to 11, characterized in that: The backflow prevention assembly includes an access cover; The access cover is configured to be able to open or close the non-return chamber.

13. The backflow prevention integrated drainage pipe fitting according to any one of claims 1 to 11, characterized in that: The backflow prevention assembly further includes a stopper, which is rotatably connected to the cavity wall of the check cavity; The stopper includes a first rotation position and a second rotation position; When the stopper is located at the first rotation position, the one-way opening and closing member can be switched between the open state and the closed state; When the stopper is located at the second rotation position, the one-way opening and closing member is always in a closed state.

14. The backflow prevention integrated drainage pipe fitting according to claim 13, characterized in that: The stopper comprises a rotating long shaft, a stopper portion and a toggle portion; The rotating long axis passes through the left and right cavity walls of the check cavity and is rotationally connected to the left and right cavity walls of the check cavity; The stopper is arranged at the center of the rotating long axis and is located in the non-return cavity; The toggle portion is disposed at one end of the rotating long shaft and is located outside the outer shell of the check chamber; The stopper and the toggle part rotate synchronously with the rotating long axis, and the stopper is switched between the first rotation position and the second rotation position by operating the toggle part.

15. The backflow prevention integrated drainage pipe fitting according to claim 14, characterized in that: When the stopper is located at the first rotation position, the stopper abuts against the top of the non-return cavity and does not affect the switching of the one-way opening and closing member between the open state and the closed state; When the stopper is located at the second rotation position, the stopper portion abuts against the one-way opening and closing member, so that the one-way opening and closing member is always in close contact with the inclined side wall.

16. The backflow prevention integrated drainage pipe fitting according to claim 14, characterized in that: A stop protrusion matched with the stop portion is provided on a side of the one-way opening and closing member away from the inclined side wall. When the stop member is located at the second rotation position, the stop portion abuts against the stop protrusion.

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