Pot-shaped flap valve device

Abstract

The invention relates to the technical field of hydraulic equipment, and discloses a pot-shaped flap valve device which comprises a pipe seat and a pot-shaped flap valve, the pipe seat is provided with a closing end and a flaring end, the diameter of the pipe seat is evenly increased from the closing end to the flaring end, and the closing end is connected with the water outlet end of a drainage pipe; when the water pressure on one side of the drainage pipe is larger than the water pressure on the outer side of the pot-shaped flap valve, water flow in the drainage pipe pushes the pot-shaped flap valve to rotate, the arc-shaped sealing piece is separated from the inner wall of the pipe base, and the pot-shaped flap valve is opened. When the water pressure of the outer side of the pot-shaped flap valve is larger than the water pressure of the inner side of the drainage pipe, water flow on the outer side of the pot-shaped flap valve applies pressure to the water retaining piece, the outer wall face of the arc-shaped sealing piece is in contact sealing with the inner wall face of the pipe base, and the pot-shaped flap valve is closed, so that the sealing effect between the pot-shaped flap valve and the pipe base is enhanced through contact sealing of the arc-shaped sealing piece and the inner wall face of the pipe base; the impact force generated when the pot-shaped flap valve is closed is reduced through the shape of the pot-shaped flap valve, and the service life of the tube base and the pot-shaped flap valve structure is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and particularly relates to a pot-shaped flap device. Background Art

[0002] In the drainage of water conservancy and municipal engineering, in order to prevent external water flow from flowing back into the drain pipe and affecting the normal operation and safety of the drainage system, a flap is usually installed at the outlet end of the drain pipe. Especially in projects such as municipal drainage, river regulation, and pumping station drainage, since the drainage pipes often lead directly to water bodies such as rivers, lakes, etc., once the external water level is higher than the pipe outlet and there is no effective one-way water stop device, backflow may occur, resulting in serious consequences such as overpressure in the pipe network, water ingress into equipment, and even urban waterlogging. Therefore, as an automatically closing and backflow-preventing structural member, the flap is a key facility to ensure the operation stability and safety of the drainage system.

[0003] The above shows that the flap is a one-way valve device commonly used at the outlet end of the drain pipe, and its main function is to prevent external water flow from flowing back into the drain pipe. The flap devices in the prior art usually consist of a door frame, a flap, a sealing ring, and a hinge. The door frame and the flap are rotationally hinged through the hinge. The rubber ring is arranged on the inner wall of the flap and can be attached to the outer wall of the door frame when the flap is closed to achieve the sealing effect of water flow. The plane matching and closing method is adopted between the door frame and the flap, and the rubber ring is used for sealing. However, for this traditional plane flap, due to the rubber ring provided on the plane flap, it must correspond to the door frame opening, and the sealing structure is prone to problems with poor sealing effect; in addition, under the action of external water pressure, the flap directly collides with the door frame under the action of water pressure, which is likely to cause a large impact force on the door frame and the flap, resulting in damage to the structures of the door frame and the flap, and there are certain safety hazards. Summary of the Invention

[0004] In view of this, the present invention provides a pot-shaped flap device to solve the two problems of poor sealing effect and large impact force of the plane flap, resulting in water leakage due to sealing, and easy damage to the door frame socket and the plane flap.

[0005] In a first aspect, the present invention provides a pot-shaped flap device, comprising:

[0006] A socket, the socket having a necked end and a flared end, the diameter of the socket increasing uniformly from the necked end to the flared end, and the necked end being connected to the outlet end of the drain pipe;

[0007] A pot-shaped flap, the top of the pot-shaped flap being hinged to the flared end, which includes an arc-shaped sealing member and a water blocking member, the water blocking member being arranged on the side of the arc-shaped sealing member away from the drain pipe;

[0008] The pot-shaped flap has an open state and a closed state. When the water pressure on one side of the drain pipe is greater than the water pressure outside the pot-shaped flap, the water flow in the drain pipe pushes the pot-shaped flap to rotate, separating the arc-shaped seal from the inner wall of the pipe socket. At this time, the pot-shaped flap is in the open state. When the water pressure outside the pot-shaped flap is greater than the water pressure on one side of the drain pipe, the water flow outside the pot-shaped flap presses on the water-blocking member, causing the outer wall surface of the arc-shaped seal to contact the inner wall surface of the pipe socket, thereby sealing and preventing water leakage. At this time, the pot-shaped flap is in the closed state.

[0009] Beneficial effects

[0010] The pot-shaped flap is arranged at the flared end of the pipe socket by means of hinge suspension. During the opening and closing processes, the water pressure in the drain pipe is different from the water pressure of the external water body, thereby generating a thrust to push the pot-shaped flap to rotate to achieve the opening and closing actions.

[0011] The arc surface of the arc-shaped seal fits the inner wall of the inclined surface of the pipe socket, replacing the traditional linear sealing method of the pipe orifice against a flat surface, making the sealing effect of the pot-shaped flap in the closed state more firm, thereby effectively preventing external water from flowing back into the drain pipe and enhancing the water-stop sealing performance of the pot-shaped flap device. Moreover, the contact surface between the arc surface of the pot-shaped flap and the inclined surface of the pipe socket is large, and the surface water-stop effect is good.

[0012] The pipe socket gradually increases uniformly from the closed end to the flared end, which helps the water flow in the drain pipe to pass smoothly when the pot-shaped flap is opened, reduces the drainage resistance, improves the drainage efficiency, and is suitable for large-flow drainage conditions such as floods and heavy rains.

[0013] The pot-shaped flap is small inside and large outside (the side of the drain pipe is the inner side), similar to a shell. When sealing, it can gradually insert into the pipe socket, so it can greatly reduce the impact force and effectively avoid the damage of the pipe socket. Therefore, combined with the buffering effect of the arc structure, the direct impact force of the external water body on the pot-shaped flap and the pipe socket is significantly reduced, the damage risk of the drain pipe and the pipe socket is lowered, and the structural stability and service life of the pot-shaped flap device are improved.

[0014] In an optional embodiment, the arc-shaped seal is hemispherical.

[0015] Beneficial effects

[0016] The arc-shaped seal is small inside and large outside, which is convenient for inserting into the pipe socket to cut off the flow. Because its shape matches the shape of the pipe socket, it can be inserted into the pipe socket to stop water without being very accurate.

[0017] The hemispherical arc-shaped seal can form a large-area surface contact with the inner wall of the pipe socket in the closed state, thereby improving the uniformity and stability of the sealing contact and effectively avoiding the water leakage problem caused by uneven local stress.

[0018] In an alternative embodiment, the water baffle is in the shape of a flat plate.

[0019] Beneficial effects

[0020] When the external water flow impacts the surface of the water baffle, the water baffle can quickly transfer the impact force evenly to the arc-shaped seal, enabling the arc-shaped seal to fully fit the inner wall of the pipe socket, thereby improving the sealing effect.

[0021] In an alternative embodiment, there is a cavity between the arc-shaped seal and the water baffle.

[0022] Beneficial effects

[0023] The cavity structure can effectively reduce the overall weight of the pot-shaped flap gate, lower the inertial force of the pot-shaped flap gate, thereby reducing the resistance suffered during the opening and closing process of the pot-shaped flap gate, and improving the response speed when the pot-shaped flap gate opens and closes.

[0024] In an alternative embodiment, the angle between the axis of the pipe socket and the inner wall surface of the pipe socket is 30°.

[0025] Beneficial effects

[0026] When the pot-shaped flap gate opens, the water flow flows out along the inclined surface direction of the inner wall of the pipe socket, reducing the water flow resistance and improving the drainage efficiency.

[0027] When the pot-shaped flap gate closes, the inclined surface structure of the pipe socket helps the pot-shaped flap gate to self-align to the sealing position under the action of water pressure, enhancing the fitting accuracy between the arc-shaped seal and the inner wall of the pipe socket, and improving the sealing reliability.

[0028] In an alternative embodiment, the diameter of the closed end is equal to the diameter of the drain pipe, and the diameter of the flared end is 1.87 times the diameter of the drain pipe.

[0029] In an alternative embodiment, the distance from the center of the closed end to the center of the flared end is 0.755 times the diameter of the drain pipe.

[0030] In an alternative embodiment, the angle between the axis of the drain pipe and the horizontal plane is [0, 10°].

[0031] In an alternative embodiment, the angle between the axis of the drain pipe and the horizontal plane is 5°.

[0032] Beneficial effects

[0033] A certain drainage inclination angle is formed between the drain pipe and the horizontal plane, which can prompt the pot-shaped flap gate to achieve natural fall and closure by relying on its own gravity when there is no obvious water pressure difference, improving the self-closing reliability of the pot-shaped flap gate in a static water or micro-pressure environment, and preventing water leakage or backflow.

[0034] Meanwhile, an appropriate drainage inclination angle can also effectively reduce the probability of eddy formation or sedimentation at the bottom of the pipe socket by the water flow, thereby reducing the risk of blockage of the drain pipe.

[0035] In an alternative embodiment, the pot-shaped flap device further includes a support hinge, which is arranged at the top of the flared end, and the pot-shaped flap is hinged to the support hinge.

[0036] Beneficial effects

[0037] The arrangement of the support hinge at the flared end forms a reliable hinge connection between the pot-shaped flap and the pipe socket, effectively improving the rotational stability and structural strength during the opening and closing of the pot-shaped flap.

[0038] The support hinge structure can guide the smooth opening and closing of the pot-shaped flap under the action of water flow pressure, preventing problems such as jamming, deflection or dislocation of the pot-shaped flap caused by installation errors or water flow interference. Description of the drawings

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 Schematic diagram of horizontal installation of a pot-shaped flap device according to an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of inclined installation of a pot-shaped flap device according to an embodiment of the present invention;

[0042] Figure 3 Orthographic view of the flap in the closed state according to an embodiment of the present invention;

[0043] Figure 4 Structural data diagram of a pot-shaped flap device according to an embodiment of the present invention;

[0044] Figure 5 Schematic diagram of a pot-shaped flap device closing under the external water body pressure according to an embodiment of the present invention.

[0045] Description of the reference numerals:

[0046] 1, pipe socket;

[0047] 2, drain pipe;

[0048] 3, pot-shaped flap, 31, arc-shaped seal, 32, water retaining member;

[0049] 4, support hinge. Detailed implementation manners

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] The following combines Figures 1 to 5 , and describes the embodiments of the present invention.

[0052] According to an embodiment of the present invention, on the one hand, a pot-shaped flap device is provided, including: a pipe socket 1 and a pot-shaped flap 3. The pipe socket 1 has a converging end and a flaring end, and the diameter of the pipe socket 1 increases uniformly from the converging end to the flaring end, and the converging end is connected to the water outlet end of the drain pipe 2; the top end of the pot-shaped flap 3 is hinged to the flaring end, and it includes an arc-shaped sealing member 31 and a water blocking member 32, and the water blocking member 32 is arranged on the side of the arc-shaped sealing member 31 away from the drain pipe 2;

[0053] The pot-shaped flap 3 has an open state and a closed state. When the water pressure on one side of the drain pipe 2 is greater than the water pressure outside the pot-shaped flap 3, the water flow in the drain pipe 2 pushes the pot-shaped flap 3 to rotate, so that the arc-shaped sealing member 31 is separated from the inner wall of the pipe socket 1. At this time, the pot-shaped flap 3 is in the open state; when the water pressure outside the pot-shaped flap 3 is greater than the water pressure on one side of the drain pipe 2, the water flow outside the pot-shaped flap 3 presses on the water blocking member 32, so that the outer wall surface of the arc-shaped sealing member 31 contacts the inner wall surface of the pipe socket 1, thereby sealing and blocking water. At this time, the pot-shaped flap 3 is in the closed state.

[0054] The pipe socket 1 is an integrally formed hollow frustum structure. The small diameter end of the frustum is the converging end, and the large diameter end of the frustum is the flaring end. The converging end of the pipe socket 1 is connected to the drain pipe 2, forming a flared expansion structure on the drain pipe 2.

[0055] Preferably, the pipe socket 1 is made of steel or composite materials, etc., to ensure that it has good strength and corrosion resistance under long-term hydraulic impact.

[0056] The pot-shaped flap is an empty box body. The inner side of the pot-shaped flap is an arc-shaped sealing member (similar to the shape of a pot), and the outer side is a flat water blocking member (similar to a pot lid); the upper edge (any point) of the pot-shaped flap is hinged to the top of the flaring end to form a suspension point.

[0057] The pot-shaped flap gate 3 is installed at the flared end of the pipe socket 1, and its upper end is connected to the pipe socket 1 through a hinge structure to achieve hinge rotation relative to the pipe socket 1. The overall shape of the pot-shaped flap gate 3 is approximately pot-shaped, and the specific gravity of the pot-shaped flap gate 3 is slightly greater than that of water. One side of the pot-shaped flap gate 3 close to the pipe socket 1 is an arc-shaped seal 31. In the closed state of the pot-shaped flap gate 3, the arc-shaped seal 31 should fit tightly with the inner wall of the pipe socket 1 to form a seal. The water blocking member 32 can directly receive the pressure of the external water body and evenly disperse the pressure to the arc-shaped seal 31, prompting the arc-shaped seal 31 to tightly adhere to the inner wall of the pipe socket 1, forming a good sealing effect.

[0058] When the internal water pressure in the drain pipe 2 is greater than the external water body pressure, the water flow pushes the pot-shaped flap gate 3 to rotate around the hinge structure, the arc-shaped seal 31 separates from the inner wall of the pipe socket 1, the pot-shaped flap gate 3 opens, and the water flow is discharged smoothly;

[0059] When the external water body pressure rises and exceeds the internal water pressure in the drain pipe 2, the external water body pushes the water blocking member 32, the pot-shaped flap gate 3 automatically falls back and closes under the dual action of gravity and water pressure. The arc-shaped seal 31 tightly adheres to the inner wall of the pipe socket 1 to form a seal, preventing the backflow of water and effectively realizing the one-way check function.

[0060] The conical pipe socket 1 structure forms a good extended diversion channel for the water flow, optimizes the water flow streamline, reduces the turbulence and energy loss during water flow discharge. At the same time, in the sealed state of the pot-shaped flap gate 3, it also reduces the impact of the external water flow on the inner walls of the pot-shaped flap gate 3 and the pipe socket 1. Compared with the impact of the traditional pot-shaped flap gate 3 on the mouth of the pipe socket 1, the structural stability of the pipe socket 1 is improved.

[0061] The pot-shaped flap gate 3 can form surface water stop with the inner wall of the pipe socket 1 in the closed state. Compared with the traditional water stop, the sealing effect is better, it is not easy to leak, and the water stop performance is effectively improved.

[0062] At the same time, the pot-shaped flap gate 3 is opened and closed relying on the internal and external water pressure difference of the drain pipe 2, without an additional power system, with high automation and sensitive opening and closing response, reducing the operation and maintenance cost.

[0063] In one embodiment, the arc-shaped seal 31 is hemispherical.

[0064] Specifically, the arc-shaped seal 31 of the pot-shaped flap gate 3 adopts a hemispherical structure (i.e., pot-shaped), and the spherical curvature matches the inner wall of the flared end of the pipe socket 1. The arc-shaped seal 31 can form a continuous and tight sealing contact surface with the inner wall of the pipe socket 1 in a spherical contact manner in the closed state.

[0065] Preferably, the hemispherical arc-shaped seal 31 is made of an elastic material (such as rubber composite material) that is corrosion-resistant and aging-resistant, which can not only adapt to the deformation sealing requirements under different water pressure conditions, but also has good reset ability and service life.

[0066] When the pot-shaped flap 3 closes under the action of external water pressure, the hemispherical arc-shaped seal 31 rotates to the sealing position under the combined action of the water pressure and its own gravity. Its spherical outer wall fits smoothly with the inner wall of the frustum-shaped pipe socket 1 to form a reliable seal and prevent water from flowing back.

[0067] When the internal water pressure in the drain pipe 2 increases, the hemispherical structure is more easily and evenly pushed open by the water flow due to its streamlined characteristics, reducing the opening and closing resistance and improving the sensitivity and efficiency of the opening and closing of the pot-shaped flap 3.

[0068] In one embodiment, the water baffle 32 is in a flat plate shape.

[0069] Specifically, the water baffle 32 is in a circular flat plate shape. The circumferential wall of one side of the water baffle 32 is fixedly welded to the circumferential wall of the arc-shaped seal 31. The other side faces the water body outside the pot-shaped flap 3, and when it is in the closed state, the other side of the water baffle 32 is flush with the end face of the flared end of the pipe socket 1.

[0070] Optionally, the water baffle 32 and the arc-shaped seal 31 can also be fixed by integral molding, screw fixing or nested connection to ensure that the connection structure between the water baffle 32 and the arc-shaped seal 31 remains stable during the opening and closing process of the pot-shaped flap 3.

[0071] The main function of designing the water baffle 32 in a flat plate shape is to better withstand the water pressure from the external water body, and at the same time generate a thrust under the action of the water pressure to press the arc-shaped seal 31 against the inner wall of the pipe socket 1, thereby forming a reliable sealing state.

[0072] The flat plate structure has a uniform stress surface, simple manufacturing process, and is convenient for replacement and maintenance.

[0073] Preferably, the water baffle 32 is made of a metal material or composite material with high strength and good impact resistance, which can not only effectively withstand the long-term impact of the external water body, but also will not significantly increase the self-weight of the pot-shaped flap 3, ensuring the flexible opening and timely closing of the pot-shaped flap 3.

[0074] In one embodiment, there is a cavity between the arc-shaped seal 31 and the water baffle 32.

[0075] Specifically, the pot-shaped flap is a hollow hemispherical shell composed of the arc-shaped seal 31 and the water baffle 32, that is, the outer wall of the arc-shaped seal 31 is connected to the flat plate-shaped water baffle 32, and a closed cavity is formed between the two.

[0076] The cavity structure of the pot-shaped flap can reduce the self-weight of the pot-shaped flap 3, making it easier to open and close when the water pressure changes, and is suitable for drainage systems in low-pressure difference scenarios.

[0077] When the cavity body is under the action of external water pressure, it has a certain buffering effect, which can absorb part of the impact force and prevent the water pressure from directly acting on the inner walls of the pot-shaped flap 3 and the pipe socket 1, thereby prolonging the service life of the pot-shaped flap 3 and the pipe socket 1.

[0078] In one embodiment, the angle between the axis of the pipe socket 1 and the horizontal plane is 30°.

[0079] Specifically, the inner wall of the pipe socket 1 extends axially outward to form an inclined surface, and the angle formed between the inclined surface and the axis of the drain pipe 2, that is, the inclination angle of the inner wall of the pipe socket 1 is 30°.

[0080] On the one hand, the 30° inclination angle of the inner wall of the pipe socket 1 can ensure that while the water flows out smoothly, the water flow velocity is effectively increased, reducing the phenomenon of water flow backflow or vortex, and improving the drainage efficiency;

[0081] On the other hand, the 30° inclination angle of the inner wall of the pipe socket 1 helps the arc-shaped seal 31 to form a surface contact with the inner wall of the pipe socket 1 in a natural fitting state when closed, thereby enhancing the sealing performance of the pot-shaped flap 3 and avoiding problems such as uneven contact between the arc-shaped seal 31 and the inner wall of the pipe socket 1 and local water leakage caused by too steep or too gentle an angle between the axis of the pipe socket 1 and the inner wall surface.

[0082] In one embodiment, the distance from the center of the closed end to the center of the flared end is 0.755 times the diameter of the drain pipe 2.

[0083] Specifically, the distance from the center of the closed end to the center of the flared end of the pipe socket 1 is the height h of the frustum, and the height h of the frustum = 0.755d, where d is the diameter of the drain pipe 2.

[0084] Under the condition that the inclination angle of the inner wall of the pipe socket 1 is 30°, the pipe socket 1 forms a suitable gradually expanding structure, and the water flow will gradually expand in the pipe socket 1, preventing the water flow from expanding sharply and thus causing backflow or pressure fluctuations.

[0085] At the same time, this structure of the pipe socket 1 facilitates the arc-shaped seal 31 to form a stable sealing contact with the inner wall of the pipe socket 1 in the closed state, enhancing the water-stopping performance of the pot-shaped flap 3.

[0086] In one embodiment, the diameter of the closed end is equal to the diameter of the drain pipe 2, and the diameter of the flared end is 1.87 times the diameter of the drain pipe 2.

[0087] Specifically, the diameter of the closed end of the pipe socket 1 is equal to the diameter d of the drain pipe 2, ensuring a smooth transition and reliable sealing when the pipe socket 1 and the drain pipe 2 are installed and connected, and there will be no steps or retracted parts between the pipe socket 1 and the drain pipe 2.

[0088] Preferably, the closed end is fixed to the water outlet end of the drain pipe 2 by welding, threaded connection or flange connection, so that the drain pipe 2 and the pipe socket 1 form an integrated through-flow structure.

[0089] The diameter D of the flared end of the socket 1 is 1.87 times the diameter d of the drain pipe 2, and this ratio can provide a good diffusion effect for the water flow. When the water flow enters the socket 1 from the drain pipe 2, the water flow can smoothly transition to the external environment in the flared structure, reducing the flow velocity and pressure at the water outlet, and alleviating the impact of the water flow on the structure of the pot-shaped flap 3.

[0090] One-third of the distance from the flared end along the axis of the socket 1 to the closed end is the contact sealing position between the arc-shaped seal 31 and the inner wall of the socket 1.

[0091] On the other hand, the pot-shaped flap 3 can also form a good falling-back path under the push of the external water pressure, and the pot-shaped flap 3 can automatically fall into the socket 1 to achieve efficient water stoppage.

[0092] In one embodiment, the included angle between the axis of the drain pipe 2 and the horizontal plane is [0, 10°].

[0093] That is to say, the drain pipe 2 can be installed horizontally (as shown in Figure 1 ), or one end of the socket 1 can be installed with an upward inclination (as shown in Figure 2 ). Specifically, in this embodiment, the included angle between the axis of the drain pipe 2 and the horizontal plane is taken as 5°.

[0094] The inclination angle design of the pot-shaped flap drain pipe 2 takes into account both the installation stability of the pot-shaped flap device and the direction control of the water flow discharge. On the one hand, maintaining a small included angle between the axis and the horizontal plane can enable the pot-shaped flap 3 assembly to use its own gravity to assist in closing in the closed state, improving the self-closing reliability of the pot-shaped flap 3 in the state of no water pressure or low water pressure;

[0095] On the other hand, the existence of an included angle between the drain pipe 2 and the horizontal plane is also beneficial to the natural drainage of the water flow during the drainage process, reducing the risk of sediment accumulation and blockage in the drain pipe 2, and improving the long-term operation efficiency of the pot-shaped flap device.

[0096] In one embodiment, the pot-shaped flap device further includes a support hinge 4, and the support hinge 4 is arranged at the top of the flared end, and the pot-shaped flap 3 is hinged to the support hinge 4.

[0097] Specifically, the support hinge 4 is installed at the upper center position of the outer edge of the flared end of the socket 1. The support hinge 4 is composed of a bracket, a rotating shaft and a connecting piece. The bracket is fixed to the outer top of the flared end of the socket 1 by welding or screws. The connecting piece is connected to the top of the arc-shaped seal 31. Connection holes are opened on the bracket and the connecting piece, and the rotating shaft is inserted into the connection holes to realize the hinged connection between the pot-shaped flap 3 and the socket 1.

[0098] The structure of the hinge 4 has strong rigidity and can stably bear the rotational torque and hydraulic impact force of the pot-shaped flap gate 3 during the opening and closing process, ensuring the smooth opening and reliable closing of the pot-shaped flap gate 3.

[0099] Preferably, the rotating shaft is made of high-strength stainless steel material and is equipped with a sealing ring or an anti-corrosion coating to ensure good corrosion resistance and lubrication performance during long-term operation in a water environment.

[0100] In other embodiments, the hinge 4 can also be an adjustable structure, which can realize the fine adjustment of the pot-shaped flap gate 3 in the vertical and horizontal directions (front and back), preventing the pot-shaped flap gate 3 from having a sealing problem due to installation errors.

[0101] Working process:

[0102] When the water pressure in the drain pipe 2 is greater than the water pressure outside the pot-shaped flap gate 3, the water flows out of the drain pipe 2 and pushes the pot-shaped flap gate 3 to rotate outward around the hinge 4 at the flared end. The pot-shaped flap gate 3 is in the open state. During this process, the arc-shaped seal 31 of the pot-shaped flap gate 3 gradually separates from the inner wall of the pipe socket 1 until the pot-shaped flap gate 3 is completely opened, forming an unobstructed flow channel, and the water can flow out of the system smoothly.

[0103] The pipe socket 1 adopts a frustum-shaped structure, and the inner wall is an inclined plane extending outward at a certain angle. The water flow can transition smoothly during the process of entering the pipe socket 1 and discharging through the pot-shaped flap gate 3, avoiding the turbulent flow and hydraulic impact that are easily formed in the traditional pot-shaped flap gate structure, and reducing the impact force of the water flow on the pipe socket 1.

[0104] When the external water pressure rises and exceeds the water pressure in the drain pipe 2, the outside water flow will push the pot-shaped flap gate 3 to rotate reversely around the hinge 4 to close. As the pot-shaped flap gate 3 closes, the outer wall of the arc-shaped seal 31 gradually contacts and presses against the inclined plane inner wall of the pipe socket 1, forming a seal between the curved surface and the inclined plane. Due to the buffering and guiding effect of the inclined plane structure, the pot-shaped flap gate 3 and the inner wall of the pipe socket 1 are evenly stressed when the pot-shaped flap gate 3 falls back and closes, weakening the impact force generated by the pot-shaped flap gate 3 at the moment of closing and protecting the structural integrity of the pot-shaped flap gate 3 and the pipe socket 1.

[0105] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pot-shaped flap device, characterized in that, Comprising: A socket (1), the socket (1) having a necked end and a flared end, the diameter of the socket (1) increasing uniformly from the necked end to the flared end, and the necked end being connected to the water outlet end of a drain pipe (2); A pot-shaped flap door (3), the top end of the pot-shaped flap door (3) being hinged to the flared end, which includes an arc-shaped seal (31) and a water-blocking member (32), the water-blocking member (32) being arranged on the side of the arc-shaped seal (31) away from the drain pipe (2); The pot-shaped flap door (3) has an open state and a closed state. When the water pressure on one side of the drain pipe (2) is greater than the water pressure outside the pot-shaped flap door (3), the water flow in the drain pipe (2) pushes the pot-shaped flap door (3) to rotate, causing the arc-shaped seal (31) to separate from the inner wall of the socket (1). At this time, the pot-shaped flap door (3) is in the open state. When the water pressure outside the pot-shaped flap door (3) is greater than the water pressure on one side of the drain pipe (2), the water flow outside the pot-shaped flap door (3) presses on the water-blocking member (32), causing the outer wall surface of the arc-shaped seal (31) to contact the inner wall surface of the socket (1), thereby sealing and stopping the water. At this time, the pot-shaped flap door (3) is in the closed state.

2. The pot-shaped flap device according to claim 1, characterized in that, The arc-shaped seal (31) is hemispherical.

3. The pot-shaped flap device according to claim 2, characterized in that, The water-blocking member (32) is flat.

4. The pot-shaped flap device according to claim 3, wherein There is a cavity between the arc-shaped seal (31) and the water-blocking member (32).

5. The pot-shaped flap device according to claim 1, characterized in that, The angle between the axis of the socket (1) and the inner wall surface of the socket (1) is 30°.

6. The pot-shaped flap device according to claim 5, characterized in that, The diameter of the necked end is equal to the diameter of the drain pipe (2), and the diameter of the flared end is 1.87 times the diameter of the drain pipe (2).

7. The pot-shaped flap device according to claim 6, characterized in that, The distance from the center of the necked end to the center of the flared end is 0.755 times the diameter of the drain pipe (2).

8. The pot-shaped flap device according to claim 1, characterized in that, The angle between the axis of the drain pipe (2) and the horizontal plane is [0, 10°].

9. The pot-shaped flap device according to claim 8, characterized in that, The angle between the axis of the drain pipe (2) and the horizontal plane is 5°.

10. The pot-shaped flap device according to any one of claims 1-9, characterized in that, Also included is a support hinge (4), the support hinge (4) being arranged at the top end of the flared end, and the pot-shaped flap door (3) being hinged to the support hinge (4).

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