A duckbill valve capable of preventing backflow in both open and closed states and an integrated pump station

Abstract

The present application relates to the technical field of duckbill valve, and particularly relates to a duckbill valve capable of preventing backflow in opening and closing states and an integrated pump station, wherein the duckbill valve comprises two flat nozzle parts which are mutually at an included angle and an anti-backflow device arranged between the two flat nozzle parts; the anti-backflow device comprises two one-way pressure increasing blocks which are oppositely arranged in the up-down direction and are respectively fixed on the two flat nozzle parts, the one-way pressure increasing blocks extend along the left-right direction, the thickness of the one-way pressure increasing blocks in the up-down direction gradually increases along the front-rear direction from the inlet to the outlet, and the spacing between the two one-way pressure increasing blocks gradually decreases along the front-rear direction from the inlet to the outlet; the anti-backflow device further comprises a separation flow guide assembly which is arranged between the two flat nozzle parts, the separation flow guide assembly is capable of being telescoped, and the separation flow guide assembly is arranged in the left-right direction at intervals. In the case that the duckbill valve is submerged in the river water, the effective impact force of the discharged water flow can prevent the water in the river from flowing into the duckbill valve, and the duckbill valve has good anti-backflow capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of duckbill valve, in particular to a duckbill valve capable of preventing backflow in both open and closed states and an integrated pump station. BACKGROUND

[0002] The duckbill valve is also called check valve, which is used to prevent liquid backflow. The duckbill valve is called so because of its appearance. The whole duckbill valve looks like a flat duckbill, so we call this kind of valve duckbill valve. The working principle of duckbill valve is simple. When liquid passes through the valve, the valve opens. When the flow or pressure increases, the opening of the duckbill valve also increases. When the water flow stops, the back pressure or atmospheric pressure will press the duckbill valve tightly to prevent liquid or odor backflow. The duckbill valve needs very small pressure to open, usually the valve can be opened when the positive and negative water level difference is 250 Pa. Because the duckbill valve is easy to open and close, and has good sealing performance, it can prevent odor backflow and meet the water(gas) sealing requirements of indoor drainage ditch and outdoor drainage pipe. Usually, the duckbill valve is arranged at the pipe opening of the integrated pump station. When normal drainage, the water pressure in the drainage pipe can open the duckbill valve to drain water into the river. When the river water level rises and submerges the duckbill valve, the duckbill valve is pressed by external water pressure. When the water pressure in the drainage pipe is not enough to open the duckbill valve, the duckbill valve will automatically close to prevent the water in the river from flowing into the pump station

[0003] The integrated pump station undertakes the function of urban drainage. In rainy season, the river water level is high, which causes the duckbill valve of the integrated pump station to be in closed state. At this time, the integrated pump station cannot drain water and cannot play the role of urban drainage. In this case, urban waterlogging is easy to occur. In this case, in order to alleviate urban waterlogging, the pump in the pump station still needs to be started to drain water. On the one hand, when the river water level is high, the duckbill valve submerged in the river water level is subjected to a large external pressure. After the pump in the pump station is started to drain water, the duckbill valve may not be opened. On the other hand, even if the pump is started to drain water and the water pressure in the pipe exceeds the external water pressure by 250 Pa to open the duckbill valve, after the duckbill valve is opened, the water pressure of the water flow out of the duckbill valve is only slightly higher than the water pressure in the river. The water in the river has strong flowability and is easy to flow back into the pump station through the duckbill valve. Not only the drainage is not realized, but also the backflow is caused. SUMMARY

[0004] The duckbill valve of the present application can prevent backflow in both open and closed states, and comprises two flat nozzle sections at an included angle and a backflow prevention device arranged between the two flat nozzle sections; the backflow prevention device comprises two one-way pressure increasing blocks arranged oppositely in the up-down direction and fixed on the two flat nozzle sections respectively, the one-way pressure increasing blocks extend in the left-right direction, the thickness of the one-way pressure increasing blocks in the up-down direction gradually increases in the front-rear direction from the inlet to the outlet, and the spacing between the two one-way pressure increasing blocks gradually decreases in the front-rear direction from the inlet to the outlet; the backflow prevention device further comprises a partitioned flow guide assembly arranged between the two flat nozzle sections, the partitioned flow guide assembly is telescopic, and the partitioned flow guide assembly is arranged in the left-right direction at intervals.

[0005] As a preferred embodiment of the present application, the partitioned flow guide assembly is arranged on the side of the one-way pressure increasing block close to the inlet.

[0006] As a preferred embodiment of the present application, the flat nozzle section is fixed with an elastic protrusion, the partitioned flow guide assembly is fixed in the elastic protrusion through the end portion, and the elastic protrusion deforms when the included angle between the partitioned flow guide assembly and the flat nozzle section changes.

[0007] As a preferred embodiment of the present application, the partitioned flow guide assembly comprises an outer sleeve member and an inner sleeve member which are sleeved with each other and can move relatively.

[0008] As a preferred embodiment of the present application, a plurality of zigzag constraint rods are further connected between the two one-way pressure increasing blocks, the zigzag constraint rods can be stretched by deformation under external force, and the zigzag constraint rods have the ability to restore the original shape.

[0009] As a preferred embodiment of the present application, the zigzag constraint rods correspond to the flow guide openings formed between any two adjacent partitioned flow guide assemblies in the front-rear direction.

[0010] As a preferred embodiment of the present application, the inner sleeve member is provided with a clamping block which always pops out, the outer sleeve member is provided with a clamping hole for the clamping block to extend out, the clamping block can enter the inner sleeve member under external force, the side wall of the clamping block away from the outer sleeve member is a blocking wall and the side wall of the clamping block toward the outer sleeve member is an arc-shaped guide wall, the blocking wall abuts against the inner wall of the clamping hole to prevent the inner sleeve member from extending out of the outer sleeve member, and the arc-shaped guide wall is extruded by the inner wall of the clamping hole to press the clamping block into the inner sleeve member.

[0011] As a preferred embodiment of the present application, the one-way pressure increasing block has an abutting surface toward the other one-way pressure increasing block at the position with the largest thickness in the up-down direction, and the two one-way pressure increasing blocks can abut against each other through the abutting surface.

[0012] As a preferred embodiment of the present application, a plug-in groove is formed on one of the abutting surfaces, and a plug-in part is arranged on the other abutting surface, and the plug-in groove and the plug-in part are in plug-in cooperation when the two abutting surfaces abut against each other.

[0013] The integrated pump station comprises a duckbill valve capable of preventing backflow in both open and closed states.

[0014] Advantages:

[0015] The backflow prevention device can increase the flow rate and water pressure of the water flow, and improve the impact force of the water flow after being discharged from the duckbill valve. In the case that the duckbill valve is submerged in the river water, the effective impact force of the discharged water flow can effectively prevent the water in the river from being guided into the duckbill valve, and has good backflow prevention ability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 2 is a schematic view of the duckbill valve in a closed state;

[0017] Figure 2 FIG. 3 is a schematic view of the duckbill valve in an open state;

[0018] Figure 3 FIG. 4 is a partial schematic view of the separation flow guide assembly;

[0019] Figure 4 FIG. 5 is a schematic view of the arrangement of the separation flow guide assembly and the zigzag constraint rod;

[0020] In the figure: 1, flat mouth part, 2, one-way pressure increasing block, 21, abutting surface, 3, separation flow guide assembly, 31, outer sleeve part, 32, inner sleeve part, 311, clamping hole, 321, clamping block, 3211, blocking wall, 3212, arc-shaped guide wall, 4, elastic protrusion, 5, zigzag constraint rod. DETAILED DESCRIPTION

[0021] The following specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, as long as the modifications are within the scope of the claims of the present application.

[0022] This invention discloses a duckbill valve capable of preventing backflow in both open and closed states, comprising two flat nozzle portions 1 at an angle to each other and an anti-backflow device disposed between the two flat nozzle portions 1; the anti-backflow device includes two unidirectional pressure boosting blocks 2 arranged vertically opposite each other and respectively fixed on the two flat nozzle portions 1, the unidirectional pressure boosting blocks 2 extending in the left-right direction, the thickness of the unidirectional pressure boosting blocks 2 gradually increasing in the front-back direction from the inlet to the outlet, and the distance between the two unidirectional pressure boosting blocks 2 gradually decreasing in the front-back direction from the inlet to the outlet; the anti-backflow device further includes a separating flow guiding component 3 mounted between the two flat nozzle portions 1, the separating flow guiding component 3 being retractable, and the separating flow guiding component 3 being spaced apart in the left-right direction. The duckbill valve has an inlet and an outlet. The two flat beak parts 1 form an angle with each other. The part that is close to each other is the outlet, and the part that is far away from each other is the inlet. This is the same as the existing duckbill valve. This embodiment is described in the initial closed state of the duckbill valve. In the initial state, the two flat beak parts 1 are roughly in a straight state. According to the working principle of existing duckbill valves, when draining, the water pressure inside the valve pushes the two flat nozzles 1 apart, causing the parts that were originally abutting to achieve a seal to move away from each other, thereby opening the duckbill valve and realizing drainage. In this embodiment, an anti-backflow device is provided between the two nozzles. When the water inside the valve is being discharged, the anti-backflow device can increase the flow rate and water pressure, and increase the impact force of the water after it is discharged from the duckbill valve. When the duckbill valve is submerged in the river water, the effective impact force of the discharged water can effectively prevent the water in the river from flowing into the duckbill valve, and has a good anti-backflow capability. In this way, as long as the duckbill valve described in this embodiment is used on the drainage pipe of the pumping station, when the city is flooded during the rainy season and the duckbill valve of the city drainage pipe is completely submerged below the river water level, the pumping station can be started to drain water into the river without the river water flowing back into the pumping station, thus alleviating urban flooding. Specifically, the anti-backflow device in this embodiment includes two unidirectional pressure boosting blocks 2 arranged facing each other. The upper unidirectional pressure boosting block 2 is fixed on the upper flat nozzle 1, and the lower unidirectional pressure boosting block 2 is fixed on the lower flat nozzle 1. The unidirectional pressure boosting blocks 2 extend in the left and right direction, trying to completely cover the flat nozzle 1 in the left and right direction. In this way, almost all the water flow needs to flow out between the two unidirectional pressure boosting blocks 2. The two unidirectional pressure boosting blocks 2 actually form a pressurized drainage channel. The distance between the two unidirectional pressure boosting blocks 2 gradually decreases in the front-to-back direction from the inlet to the outlet, which actually makes the vertical width of the drainage channel gradually decrease, thereby pressurizing and accelerating the water flow. Moreover, this pressurization and acceleration is unidirectional, towards the outlet.The significant effect of the aforementioned drainage channel on pressurizing and accelerating water flow is evident in comparison with existing duckbill valves that do not have a unidirectional pressurizing block 2. This is mainly reflected in two aspects: Firstly, the unidirectional pressurizing block 2 itself has thickness, and the vertical width of the drainage channel formed between two unidirectional pressurizing blocks 2 is smaller than the width of the space between two flat nozzles 1, thus pressurizing and accelerating the water flow. Secondly, the amount by which the vertical distance between two unidirectional pressurizing blocks 2 narrows per unit distance in the front-back direction is greater than the amount by which the vertical distance between two flat nozzles 1 narrows, resulting in a better pressurization and acceleration effect. The unidirectional pressurizing block 2 reduces its width in the vertical direction to pressurize and accelerate the water flow, while the diverting and guiding component 3 in this embodiment diverts the water flow in the left-right direction. The water flows between two adjacent diverting and guiding components 3, further improving both water pressure and flow velocity. Therefore, overall, the anti-backflow device can effectively improve the water pressure and flow velocity during drainage, and has a good anti-backflow effect. Since the opening and closing of the duckbill valve is accompanied by the opening and closing of the two flat mouth parts 1, the dividing and guiding assembly 3 can extend and retract to meet the vertical width changes at the installation position.

[0023] In this embodiment, the diverting and guiding component 3 is preferably located on the side of the unidirectional pressurizing block 2 near the inlet. It first diverts a large area of ​​water flow, providing initial pressurization and acceleration. At this stage, the cross-sectional area of ​​the water flow is large, primarily serving a diversion function, with a relatively low degree of pressurization and acceleration. After diversion, the water flows into the drainage channel between the two unidirectional pressurizing blocks 2, and as it continues to flow towards the outlet, it receives pressurization and acceleration, at which point the degree of pressurization and acceleration is higher. During the opening and closing of the duckbill valve, the diverting and guiding component 3 not only needs to extend and retract to adapt, but there is also an angle change between it and the flat nozzle 1. If the flat nozzle 1 is made of a deformable material such as rubber, the end of the diverting and guiding component 3 can be directly twisted, causing a certain rotation of the diverting and guiding component 3 relative to the flat nozzle 1. However, this is unreliable and prone to cracking. Therefore, in this embodiment, it is preferable to fix an elastic protrusion 4 on the flat nozzle 1, and fix the dividing and guiding component 3 in the elastic protrusion 4 through its end. When the included angle between the dividing and guiding component 3 and the flat nozzle 1 changes, the elastic protrusion 4 deforms. Using an elastic protrusion 4 separate from the flat nozzle 1, the specific material can be a material that is easy to deform, such as rubber. The end of the dividing and guiding component 3 is directly fused to the elastic protrusion 4. The elastic protrusion 4 is easier to deform and more durable, and is not easily damaged.

[0024] Preferably, the diverting and guiding component 3 includes an outer sleeve 31 and an inner sleeve 32 that are nested together and capable of relative movement. This nesting design ensures the strength of the diverting and guiding component 3, allowing it to withstand the impact of water flow for extended periods, and maintaining structural stability during expansion and contraction. Specifically, the diverting and guiding effect of the diverting and guiding component 3 is reflected in its width in the left-right direction. A larger width results in a better diversion effect and a better pressurization and acceleration effect at this stage. Therefore, both the outer sleeve 31 and the inner sleeve 32 are plate-shaped, with their specific width determined according to actual needs.

[0025] Further improvements include the preferred addition of several tortuous constraint rods 5 between the two unidirectional pressure boosting blocks 2. These tortuous constraint rods 5 can extend through deformation under external force and possess the ability to recover their initial shape. When the duckbill valve is closed, the tortuous constraint rods 5 remain in their initial, undeformed state, maintaining their initial shape. When the duckbill valve is open, the tortuous constraint rods 5 extend to accommodate the increased vertical width. The tortuous constraint rods 5 are located in the drainage channel between the two unidirectional pressure boosting blocks 2. After the water flow is diverted by the separating and guiding components 3, it is further and more finely divided by the tortuous constraint rods 5 in the drainage channel, further improving the pressure boosting and acceleration effect. A guide port is formed between any two adjacent separating and guiding components 3, from which the water flows out. Therefore, it is preferable that the tortuous constraint rods 5 are formed in the guide ports between any two adjacent separating and guiding components 3 along the front-to-back direction, thus fully utilizing the function of the tortuous constraint rods 5. The tortuous constraint rod 5 is made of flexible metal and has a tortuous shape, such as an arc-shaped S. When the duckbill valve is closed, the tortuous constraint part returns to its initial shape. When the tortuous constraint part is extended, it has a maximum extendable length, basically reaching a roughly straight state. At this time, the tortuous constraint part restricts the further opening of the duckbill valve, so the tortuous constraint part also has the function of limiting the maximum opening degree of the duckbill valve. In the use of existing duckbill valves, as long as the water pressure is high enough, the duckbill valve will usually be fully opened, and its outlet is almost the same as the cross-section of the pipe. This obviously makes it difficult to increase the pressure and speed of the water flow. However, the tortuous constraint part in this embodiment can limit the maximum opening degree of the duckbill valve. Even if the water pressure is high, the duckbill valve will not be fully opened. Its smaller outlet can increase the water pressure and flow rate, thus improving the anti-backflow effect. In addition, when drainage stops, the tortuous constraint part's ability to return to its initial shape can accelerate the closing of the duckbill valve, further preventing backflow.

[0026] The tortuous constraint part has the ability to deform and restore its shape, so it is relatively thin and has low strength. In this embodiment, the water pressure and flow rate of the duckbill valve are increased, so the tortuous constraint part not only needs to withstand the impact of the water flow, but also needs to withstand the tension applied to it by the two flat mouth parts 1 moving away from each other. The tortuous constraint part is difficult to withstand and is very easy to break. Therefore, in this embodiment, the inner sleeve 32 is preferably provided with a snap-fit ​​block 321 that always pops outward, and the outer sleeve 31 is provided with a snap-fit ​​hole 311 for the snap-fit ​​block 321 to extend outward. Under external pressure, the snap-fit ​​block 321 can enter the interior of the inner sleeve 32. The side wall of the snap-fit ​​block 321 facing away from the outer sleeve 31 is a blocking wall 3211, and the side wall facing the outer sleeve 31 is an arc-shaped guide wall 3212. The blocking wall 3211 abuts against the inner wall of the snap-fit ​​hole 311 to prevent the inner sleeve 32 from extending out of the outer sleeve 31. The inner wall of the snap-fit ​​hole 311 presses against the arc-shaped guide wall 3212 to press the snap-fit ​​block 321 into the interior of the inner sleeve 32. When the duckbill valve is closed, the part of the inner sleeve 32 with the snap-fit ​​block 321 is completely surrounded by the outer sleeve 31, and the snap-fit ​​block 321 is also pressed inside the inner sleeve 32. When the duckbill valve begins to open, the inner sleeve 32 gradually extends out of the outer sleeve 31 until the part of the inner sleeve 32 with the snap-fit ​​block reaches the position of the snap-fit ​​hole 311 of the corresponding outer sleeve 31. After the snap-fit ​​block 321 is freed from restraint, it extends out of the snap-fit ​​hole 311, and the snap-fit ​​hole 311 surrounds the snap-fit ​​block 321. After the snap-fit ​​block 321's blocking wall 3211 abuts against the inner wall of the snap-fit ​​hole 311, the movement of the snap-fit ​​block 321 away from the outer sleeve 31 is stopped, and the separating flow guide component 3 can no longer extend, limiting the continued opening of the duckbill valve, reducing the burden on the tortuous constraint part, and even the main limiting effect is performed by the separating flow guide component 3. Of course, the separating flow guide component 3 needs to reach its maximum extension before the tortuous constraint part reaches full extension. When the duckbill valve begins to close, the separator guide assembly 3 begins to contract, and the snap-fit ​​block 321 is instead subjected to force by the arc-shaped guide wall 3212 on the other side. The inner wall of the snap-fit ​​hole 311 squeezes the arc-shaped guide wall 3212, but cannot stop the snap-fit ​​block 321. As the snap-fit ​​block 321 moves, the snap-fit ​​block 321 is gradually squeezed into the inner sleeve 32 by the outer sleeve 31, and the inner sleeve 32 continues to contract into the outer sleeve 31.

[0027] In this embodiment, the duckbill valve prevents backflow of river water by pressurizing and accelerating the discharged water flow when it is open. While the duckbill valve itself has good backflow prevention when closed, this embodiment further enhances its backflow prevention capability when closed by utilizing a one-way pressure booster block 2. In this embodiment, the one-way pressure booster block 2 has a contact surface 21 facing another one-way pressure booster block 2 at its thickest point in the vertical direction. The two one-way pressure booster blocks 2 can abut against each other through the contact surfaces 21, achieving a secondary seal inside the duckbill valve. Even if the duckbill valve itself weakens in sealing due to aging or other factors, the secondary sealing by the two one-way pressure booster blocks 2 can still ensure the backflow prevention capability of the duckbill valve. Further improvement, preferably, one contact surface 21 has a insertion groove, and the other contact surface 21 has a insertion part. When the two contact surfaces 21 abut against each other, the insertion groove and the insertion part engage, further improving the sealing effect.

[0028] The present invention discloses an integrated pumping station, including a duckbill valve that can prevent backflow in both open and closed states. The duckbill valve is installed on the drain. When the duckbill valve is submerged by river water, as long as the drainage pump of the pumping station is started, it can still drain water into the river and prevent river water from flowing back into the pumping station.

[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A duckbill valve that prevents backflow in both open and closed states, characterized in that, The device includes two flat nozzles (1) that are angled together and an anti-backflow device disposed between the two flat nozzles (1). The anti-backflow device includes two unidirectional pressure blocks (2) that are arranged facing each other and fixed on the two flat nozzles (1). The unidirectional pressure blocks (2) extend in the left-right direction. The thickness of the unidirectional pressure blocks (2) in the vertical direction gradually increases along the front-back direction from the inlet to the outlet. The distance between the two unidirectional pressure blocks (2) gradually decreases along the front-back direction from the inlet to the outlet. The anti-backflow device also includes a separation and guide assembly (3) that is mounted between the two flat nozzles (1). The separation and guide assembly (3) is telescopic and is arranged at intervals in the left-right direction. The separation and diversion assembly (3) is disposed on the side of the unidirectional booster block (2) near the inlet; An elastic protrusion (4) is fixed on the flat nozzle (1). The dividing and guiding component (3) is fixed in the elastic protrusion (4) through its end. When the included angle between the dividing and guiding component (3) and the flat nozzle (1) changes, the elastic protrusion (4) deforms. The separation and diversion assembly (3) includes an outer sleeve (31) and an inner sleeve (32) that are interlocked and capable of relative movement. Several tortuous constraint rods (5) are also connected between the two unidirectional pressure blocks (2). The tortuous constraint rods (5) can be extended by deformation under the action of external force, and the tortuous constraint rods (5) have the ability to restore their initial shape. The tortuous constraint rod (5) is formed in the front-back direction at the flow port between any two adjacent separation flow guide components (3); The inner sleeve (32) is provided with a snap-fit ​​block (321) that always pops outward. The outer sleeve (31) is provided with a snap-fit ​​hole (311) for the snap-fit ​​block (321) to extend outward. The snap-fit ​​block (321) can enter the inner sleeve (32) under external pressure. The side wall of the snap-fit ​​block (321) away from the outer sleeve (31) is a blocking wall (3211), and the side wall facing the outer sleeve (31) is an arc-shaped guide wall (3212). The blocking wall (3211) abuts against the inner wall of the snap-fit ​​hole (311) to prevent the inner sleeve (32) from extending out of the outer sleeve (31). The inner wall of the snap-fit ​​hole (311) presses the arc-shaped guide wall (3212) to press the snap-fit ​​block (321) into the inner sleeve (32).

2. The duckbill valve according to claim 1, which prevents backflow in both open and closed states, is characterized in that, The unidirectional booster block (2) has a contact surface (21) facing another unidirectional booster block (2) at the part with the greatest thickness in the vertical direction, and the two unidirectional booster blocks (2) can abut against each other through the contact surface (21).

3. A duckbill valve that prevents backflow in both open and closed states according to claim 2, characterized in that, One of the abutting surfaces (21) is provided with a insertion groove, and the other abutting surface (21) is provided with a insertion part. When the two abutting surfaces (21) abut against each other, the insertion groove and the insertion part are inserted and engaged.

4. An integrated pumping station, characterized in that, Includes a duckbill valve as described in any one of claims 1-3, which can prevent backflow in both open and closed states.

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