CN214404815U - Self-cleaning check valve - Google Patents

Abstract

The utility model relates to an underground pressure drainage accessory field specifically is a check valve of self-cleaning, include: the valve body is provided with an upper opening and a lower opening and is arranged in the pipeline; a self-resetting one-way blocking piece is arranged between the upper opening and the lower opening and is used for blocking the back flow of silt from the upper opening to the lower opening; and a liquid guide cavity is arranged below the lower opening, a blockage removing flushing opening for flushing the self-resetting one-way blocking piece is arranged in the valve body, and the liquid guide cavity is communicated with the inside of the valve body through the blockage removing flushing opening. The check valve is used for draining water of the underground foundation pit, and is used for preventing silt carried by water body during backflow from accumulating at a drainage outlet of the sewage pump to cause blockage; on the other hand, when the valve is blocked, water flow can be guided to enter the interior of the valve body through the communicated liquid guide cavity and the blockage removing flushing port. The blockage removing and flushing port continuously flushes the self-resetting one-way blocking piece, so that sand and sand which obstruct the movement of the self-resetting one-way blocking piece around the self-resetting one-way blocking piece are quickly dispersed, and the communication is automatically closed after the check valve is restored to be normal, thereby realizing the self-cleaning function.

Description

Self-cleaning check valve

Technical Field

The utility model relates to an underground pressure drainage accessory field, more specifically relates to a check valve of self-cleaning.

Background

During construction, the foundation treatment process often needs to be performed underground. Pressure drainage is an important ring in underground operation, and is used for stabilizing soil in a foundation pit and ensuring safe construction. The interior of the foundation pit is affected by various currents, such as seepage of groundwater from slopes and the bottom of the pit, rain water, etc., which continuously enter the foundation pit. During actual engineering operation, these water bodies cannot be completely emptied at one time, so in a foundation pit, an underground pressure drainage system is usually arranged to continuously drain accumulated water in the foundation pit to the outside of the ground so as to ensure underground pressure drainage operation.

The drainage speed of the drainage system is higher than the increase speed of the water seeped out of the foundation pit certainly, so that the drainage system needs to be stopped due to insufficient water level when the water body is pumped to a certain state. When the water body is accumulated to a certain height, the drainage system needs to be restarted for drainage, so that the drainage system is mostly in an unmanned automatic detection control state. These water deposits, along with excavation of the excavation pit, typically contain a large amount of silt and debris. When the pump is stopped, a large amount of silt backflow and large sundries are drawn into the pump, which are main causes of blockage of a sewage system. According to the traditional method, the filter cover is arranged at the water pumping port of the pump to filter silt and massive impurities, however, the silt is small in particle, the filter hole is too large to prevent the silt from entering the pump, the filter hole is too small and easy to block, the filter cover is often required to be cleaned and replaced, and the filter cover is not beneficial to practical application.

Particularly, silt backflow blocks the sewage pump and has a close relation with the drainage height of the sewage pump, and the deeper foundation pit is stopped, the more silt backflow is, the easier the blockage of the sewage pump is. The dredge pump is cleaned after being blocked, the pipeline is required to be detached, a large amount of silt in the pump can be led to return to a foundation pit, the maintenance time is long, and the maintenance efficiency is low. There is a need for an apparatus for preventing blockage of an underground pressure drainage system caused by backflow of silt to solve the problem of influence of muddy water on a drainage system, improve the efficiency of the underground pressure drainage system, and automatically eliminate the blockage.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned prior art's at least not enough, provide a check valve of self-cleaning for separate silt when preventing that the dredge pump from stopping drawing water, prevent silt backward flow and block up the dredge pump, and can eliminate by oneself when the check valve blocks up and block up, it is more convenient to make the clearance arrange stifled, and the mediation is faster. Greatly reducing the workload and saving the operation time.

The utility model discloses the technical scheme who takes is, a check valve of self-cleaning, include: the valve body is provided with an upper opening and a lower opening and is arranged in the pipeline; a self-resetting one-way blocking piece is arranged between the upper opening and the lower opening and is used for blocking the back flow of silt from the upper opening to the lower opening; and a liquid guide cavity is arranged below the lower opening, a blockage removing flushing opening for flushing the self-resetting one-way blocking piece is arranged in the valve body, and the liquid guide cavity is communicated with the inside of the valve body through the blockage removing flushing opening.

The check valve is used for drainage of an underground foundation pit or pressure drainage of a basement and is arranged on a pipeline outside a drainage outlet of the sewage pump, so that on one hand, the check valve is used for preventing silt carried by water body during backflow from accumulating at the drainage outlet of the sewage pump to cause blockage; on the other hand, when the check valve blocks up, can guide rivers to get into the inside of valve body through the drain chamber of intercommunication and the stifled scouring port that removes, wash the softness with hardened silt earlier, then make the silt of gathering can local removal after combining with rivers, form the washing to self-reset one-way blocking piece at last, make self-reset one-way blocking piece can progressively open, enlarge the rivers in the valve body. The blockage removing and flushing port continuously flushes the self-resetting one-way blocking piece, so that sand and sand which obstruct the movement of the self-resetting one-way blocking piece around the self-resetting one-way blocking piece are quickly dispersed, and the communication is automatically closed after the check valve is restored to be normal, thereby realizing the self-cleaning function.

In the technical scheme, the blockage removing flushing port is communicated with the interior of the valve body through a bypass pipe, and a valve is arranged at one end of the bypass pipe close to the blockage removing flushing port.

The external independent bypass pipe is used for unblocking and communicates in scouring port and the valve body and can make things convenient for the maintenance and the clearance of bypass pipe, can prevent through setting up the valve that silt from passing through the bypass pipe and flowing back in leading the liquid chamber, avoids the bypass pipe to be blockked up.

In this technical scheme, the one-way barrier piece that resets includes: the elastic reset piece is fixed on the upper opening; the blocking flap is connected with the elastic resetting piece and is pushed by the elastic resetting piece to close the lower opening; the blocking-removing flushing port is right opposite to the elastic reset piece, and the bypass pipe and the blocking-removing flushing port can guide water flow to flush the elastic reset piece when the blocking flap cannot rise.

The plug-removing flushing port is right opposite to the elastic reset piece, so that after water enters the valve body through the bypass pipe, the water can be concentrated and mainly used for flushing the elastic reset piece, and the introduced water flushing effect is more effective through the arrangement of the plug-removing flushing port.

In the technical scheme, the bypass pipe is movably connected with the blockage-removing flushing port.

The movable connection of the by-pass pipe can facilitate the replacement or the rapid treatment of the by-pass pipe.

In this technical scheme, be equipped with the non return spare of elastic control in the bypass pipe, the non return spare includes: the mounting part is positioned at one end of the check piece and is communicated with the liquid guide cavity; the communicating part is a hollow pipe body, one end of the communicating part is communicated with the mounting part, and a water outlet used for being communicated with the outside is arranged; the elastic sleeve wraps the communication part and seals the water outlet by utilizing the elastic contraction of the elastic sleeve; the separation blocking part is used for blocking one end of the communicating part, which is far away from the mounting part, and is combined with the mounting part to form fixation of the position of the elastic sleeve; the water pressure entering the communicating part is larger than the elastic contraction force of the elastic sleeve, the elastic sleeve for plugging the water outlet is expanded, and the water enters the bypass pipe through the check piece.

Through set up the non return spare in the bypass pipe, can utilize the design of non return spare to make the bypass pipe of intercommunication valve body and drain chamber can not produce the silt backward flow under the condition that does not set up valve control, can not cause silt to block up, make the self-cleaning function of realizing through another kind of mode of check valve.

In the technical scheme, the bypass pipe penetrates through the blocking flushing port and extends into the valve body to form an extension flushing section.

The scouring section plays a role in guiding scouring water flow, so that the scouring water flow entering the valve body is more concentrated, the scouring position is more accurately towards the elastic resetting piece, and the water flow is more effective under the action of the outward scouring section.

In this technical scheme, the extension erodees the section and is equipped with the end cover of activity, end cover upper portion forms swing joint with the port upper portion that the excircle erodees the section, the end cover shelters from the port that the excircle erodees the section through the action of gravity.

The end cover utilizes self gravity, forms the one-way end cover that overturns at the opening part of epitaxial scouring section, makes epitaxial scouring section form one-way conduction, has thoroughly blocked silt and has flowed back to the problem of drain chamber through the bypass pipe.

In the technical scheme, the end cover is provided with a bulge formed by intersecting two inclined planes.

The bulge on the end cover can be used for pushing away the blocked silt when the silt is blocked, so that the end cover can be opened more easily.

In this technical scheme, the lateral wall of valve body is equipped with the opening, the lateral wall outwards extends along the opening, forms the scavenge port that can open, the scavenge port can discharge silted up stifled silt when the other-way pipe erodees the elasticity piece that resets to guarantee the normal of valve clack and open.

Through the lateral wall at the valve body setting clean the mouth, make the valve body when blockking up, can clear up fast, need not whole clearance of detaching, make check valve's clearance more convenient and fast with the maintenance. The self-cleaning device is matched with the liquid guide cavity and the bypass pipe to form self-cleaning, and can be used for rapidly cleaning by opening the cleaning port when cleaning blockage.

In the technical scheme, the cleaning opening is provided with a cover with a sealing element, and the cover and the cleaning opening are movably connected and are manually opened.

The manually opened lid allows the cleaning opening to be easily opened when the check valve is severely clogged.

Compared with the prior art, the beneficial effects of the utility model are that: the blockage caused by the accumulation of silt carried by the water body in the drainage outlet of the sewage pump during the backflow of the water body is prevented; when the check valve is blocked, water flow can be guided to enter the valve body through the communicated liquid guide cavity and the blockage removing flushing port, and the self-resetting one-way blocking piece is flushed, so that the self-resetting one-way blocking piece can be gradually opened, and the blockage of the check valve is eliminated.

Drawings

Fig. 1 is the check valve schematic diagram of the utility model with a valve control bypass pipe and a cleaning opening.

Fig. 2 is a schematic view of the check valve of the present invention, which uses a check member to control the bypass pipe and does not have a cleaning opening.

Fig. 3 is a schematic view of the bypass pipe when the check member is used for controlling the flushing of the utility model.

Fig. 4 is a top view of the check valve with a valve controlling bypass pipe and a cleaning opening of the present invention.

Description of reference numerals: the self-resetting one-way blocking device comprises a valve body 100, an upper opening 200, a fixing arm 210, a lower opening 300, a self-resetting one-way blocking piece 400, an elastic resetting piece 410, a blocking flap 420, an annular convex ring 421, a cleaning opening 500, a fixing wall 510, a cover 600, a sealing piece 610, a liquid guiding cavity 710, a blockage and flushing removing opening 720, a bypass pipe 730, a valve 731, a vertical smooth section 732, a slope section 733, a connecting cavity 734, a check piece 740, a mounting part 741, a communicating part 742, an elastic sleeve 743, a blocking part 744 and a water outlet 745.

Detailed Description

The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, the present embodiment is a self-purging check valve including: a valve body 110 provided with an upper opening 200 and a lower opening 300, disposed in the pipe; a self-resetting one-way blocking piece 400 is arranged between the upper opening 200 and the lower opening 300 and is used for blocking the back flow of silt from the upper opening 200 to the lower opening 300; a drainage cavity 710 is arranged below the lower opening 300, a de-blocking flushing port 720 for flushing the self-resetting one-way blocking element 400 is arranged in the valve body 110, and the drainage cavity 710 is communicated with the interior of the valve body 110 through the de-blocking flushing port 720.

The check valve is used for draining water of the underground foundation pit and is arranged on a pipeline outside a drainage port of the sewage pump, so that on one hand, the check valve is used for preventing silt carried by water body during backflow from accumulating at the drainage port of the sewage pump to cause blockage; on the other hand, when the check valve is blocked, water flow can be guided to enter the interior of the valve body 110 through the communicated liquid guide cavity 710 and the blockage removing flushing port 720, hardened silt is flushed and softened firstly, then the accumulated silt can move locally after being combined with the water flow, and finally flushing of the self-resetting one-way blocking piece 400 is formed, so that the self-resetting one-way blocking piece 400 can be opened gradually, and the water flow in the valve body 110 is enlarged. The blockage-removing flushing port 720 continuously flushes the self-resetting one-way blocking member 400, so that the sand blocking the movement of the self-resetting one-way blocking member is quickly dispersed, and the communication is automatically closed after the check valve is restored to be normal, thereby realizing the self-cleaning function.

The water in the underground foundation pit contains more sundries and silt, large sundries are easily isolated before entering the sewage pump through the filter screen, and fine silt is difficult to avoid. If the filter screen is separated by a fine filter screen, frequent blockage and replacement of the filter screen are faced, and the filter screen is not suitable for practical use. And the sewage pump blockage caused by sundries and silt can be effectively prevented through the filter screen and the one-way valve. In the actual drainage process, the blockage of the pump body caused by silt mainly occurs when the pump is stopped. Along with the decline of water level, the more nearly water body when emptying contains silt volume higher more, when water evacuation dredge pump stopped, because intraductal negative pressure can lead to not discharging the water backward flow of the high silt content of body, because the body is long, and the water contains silt volume greatly, and silt can be gathered in a large number outside dredge pump outlet and arouse the jam of dredge pump. If the water body containing 10% of silt flows back, silt which is close to 30cm is deposited above the check valve by a 3-meter vertical pipe; when 20% of the water containing silt flows back, 10 meters of the vertical pipe can deposit nearly 2m of silt above the check valve.

The design of check valve stops the silt of backward flow outside the outlet to guarantee that the drain pump can not block up. However, the accumulation position of the transferred silt cannot completely solve the problem of blockage, and a drainage chamber 710 is further provided below the lower opening 300, wherein the drainage chamber 710 is a cavity formed below the lower opening 300 blocked by the self-resetting one-way blocking member 400 and the sidewall of the valve body 110 extends downwards. The upper opening 200 is provided with a pipe connector capable of being detachably connected with the pipe body, and a pipe connector capable of being reliably connected with the pipe body is also arranged below the liquid guide cavity 710. The drainage cavity 710 has an outward-communicating outlet, and the de-blocking flushing port 720 is formed in the side wall of the valve body 110 and is communicated with the outlet, so that the drainage cavity 710 is communicated with the interior of the valve body 110 blocked by the self-resetting one-way blocking member 400, and the back flow of silt is controlled by means of arranging a valve 731, controlling the size of a channel or adjusting the structure of the de-blocking flushing port 720 and the like.

The unblocking flushing port 720 is communicated with the inside of the valve body 110 through a bypass pipe 730, and a valve 731 is disposed at one end of the bypass pipe 730 close to the unblocking flushing port 720. The external independent bypass pipe 730 is used for unblocking and is communicateed in scouring port 720 and valve body 110 and can make things convenient for maintenance and the clearance of bypass pipe 730, can prevent through setting up valve 731 that silt from passing through bypass pipe 730 backward flow to leading in the liquid chamber 710, avoids bypass pipe 730 to be blockked up.

The de-blocking flushing port 720 and the liquid outlet in the drainage cavity 710 both extend out of the valve body 110 to form a first connection port and a second connection port, and one end of the bypass pipe 730 is connected with the first connection port and the other end is connected with the second connection port to communicate the interior of the valve body 110 with the drainage cavity 710. The bypass pipe 730 is connected to the first connection port, and a valve 731 for controlling the opening and closing of the bypass pipe 730 is provided outside the valve body 110, and the valve 731 may be an electromagnetic valve or a manual opening and closing valve 731. By opening the valve 731, the bypass pipe 730 is conducted, water blocked in the liquid guide cavity 710 is guided into the valve body 110, the self-resetting one-way blocking piece 400 clamped by silt in the valve body 110 is flushed, silt around the self-resetting one-way blocking piece 400 is softened, and after the self-resetting one-way blocking piece gradually recovers to move, the valve 731 is closed, so that the silt is prevented from flowing back to the discharge port of the sewage pump through the bypass pipe 730 in a large amount when the sewage pump stops, and the sewage pump is blocked.

The self-resetting unidirectional barrier 400 includes: an elastic restoring member 410 fixed on the upper opening 200; a blocking flap 420 connected to the elastic restoring member 410 and closing the lower opening 300 by being pushed by the elastic restoring member 410; the de-blocking flushing port 720 faces the elastic restoring member 410, and the bypass pipe 730 and the de-blocking flushing port 720 can guide water flow to flush the elastic restoring member 410 when the blocking flap 420 cannot rise. The unblocking flushing port 720 is opposite to the elastic reset piece 410, so that after water enters the valve body 110 through the bypass pipe 730, the water can be concentrated and mainly used for flushing the elastic reset piece 410, and the introduced water flushing effect is more effective through the arrangement of the unblocking flushing port 720.

One end of the elastic resetting piece 410 is fixed on the upper opening 200, the other end is connected with the blocking flap 420, the lower part of the blocking flap 420 is a circular blocking piece, the circular blocking piece is used for sealing the lower opening 300, the upper part of the blocking flap 420 is a fixing position, and the fixing position is connected with the elastic resetting piece 410. The elastic restoring member 410 pushes the blocking flap 420 from the upper opening 200 to the lower opening 300 by its own elastic action until it contacts the edge of the lower opening 300, forming a closure of the lower opening 300. When the sewage pump drives the water body to enter the lower opening 300 of the check valve, the pressure of the water body is greater than the extrusion force of the elastic reset piece 410 to the blocking flap 420, the blocking flap 420 is pushed open, and the water body enters the valve body 110 and flows into the upper opening 200. When the water flow is active, the silt is continuously mixed with the water more evenly without causing blockage. However, as the pump down time increases, the accumulated silt is prone to caking, which can easily cause the check valve to block.

When the sewage pump stops, the blocking flap 420 rapidly blocks the water above and below the lower opening 300 under the action of the elastic resetting member 410, and the backflow silt is accumulated on the blocking flap 420 and extrudes and clamps the elastic resetting member 410, so that the elastic resetting member 410 cannot deform, and the blocking flap 420 cannot be pushed. The resistance generated by the accumulation of silt and the extrusion force generated by the incapability of deforming the elastic resetting piece 410 greatly increase the pressure required for pushing the blocking flap 420, so that the blocking flap 420 cannot lift, and the pipeline is blocked. In fact, as long as the sand around the elastic reset piece 410 is loosened by the active water flow, the blocking flap 420 can rise locally, the water flow can rapidly dredge the blockage, and the design that the blockage removing and flushing port 720 is over against the elastic reset piece 410 makes the flushing of the water flow more effective.

The bypass pipe 730 is movably connected with the de-blocking flushing port 720. The articulating connection can facilitate replacement or rapid processing of the bypass tube 730.

Further, the bypass pipe 730 is a hard thin pipe, the pipe diameter of the bypass pipe 730 is reduced from large to small, the pipe diameter of the end connected with the drainage cavity 710 is large, and the pipe diameter of the end connected with the deblocking flushing port 720 is small.

The outer circle scouring device is provided with a movable end cover, the upper part of the end cover is movably connected with the upper part of the port of the outer circle scouring section, and the end cover shields the port of the outer circle scouring section under the action of gravity. The end cover utilizes self gravity to form a one-way turnover end cover at the opening of the epitaxial scouring section, so that the epitaxial scouring section is in one-way conduction, and the problem that silt flows back to the liquid guide cavity 710 through the bypass pipe 730 is thoroughly solved.

The end cover can turn over and move, the movable included angle between the end cover and the opening is smaller than 180 degrees, and the end cover is limited to turn over through a limiter arranged on the movable connection. Preferably, the movable included angle between the end cap and the opening is less than 90 °. Under the action of gravity, the end cover can automatically reduce the included angle between the end cover and the opening, and finally the opening is closed. When water flows out through the ramp 733, the water presses against the end cap, which is pushed open, thereby forcing water into the valve body 110.

The end cover is provided with a bulge formed by intersecting two inclined planes. The bulge on the end cover can be used for pushing away the blocked silt when the silt is blocked, so that the end cover can be opened more easily. The protrusion forms a protrusion line which is arranged in the middle of the vertical direction of the end cover. The upper end of the convex line is tightly attached to the upper part of the end cover, and the lower end of the convex line keeps a certain distance from the end cover to form a convex with a light upper part and a heavy lower part, so that the action of gravity on the end cover is more obvious.

The side wall of the valve body 110 is provided with an opening, the side wall extends outwards along the opening to form a cleaning opening 500 which can be opened, and the cleaning opening 500 can discharge silted mud when the elastic restoring piece 410 is washed. Through set up cleaning opening 500 at the lateral wall of valve body 110, make valve 731 when blockking up, can clear up fast, need not whole clearance of detaching, make the clearance and the maintenance of check valve more convenient and fast. The self-cleaning formed by the cooperation of the drainage lumen 710 and the bypass tube 730 can be rapidly cleaned by opening the cleaning opening 500 when cleaning the blockage.

The setting of check valve has effectively separated silt backward flow in the pipeline, and most silt separation is before the dredge pump when stopping the pump, and the dredge pump only receives the silt backward flow of a very short section route, has avoided whole silt to concentrate to gather and has leaded to the dredge pump to block up. But separate silt and can't guarantee completely that the pipeline can not block up, if the silt of pipeline is too much, though can not influence the pump body, still can cause the jam of check valve. Similarly, the self-cleaning function of check valve is taken effect slowly in sealed pipeline, further through setting up scavenge port 500, makes the silt after scouring discharge through scavenge port 500, can accelerate the function of self-cleaning and take effect.

The cleaning opening 500 is provided with a cover 600 having a sealing member 610, and the cover 600 is movably connected to the cleaning opening 500 as a manual opening member. The cleaning opening 500 can be easily opened when the check valve is severely clogged by the cover 600 which is manually opened. The arrangement of the cleaning opening 500 reduces the time for completely or completely unloading the check valve or one end of the check valve for cleaning by using a special tool in the prior art, and avoids the problem of long maintenance and cleaning time caused by connection after cleaning is finished and water and silt accumulated in the pipe body are emptied.

The centers of the upper opening 200, the lower opening 300, and the self-resetting one-way stopper 400 are located on the same axis. The cleaning opening 500 has an outwardly extending fixing wall 510, and the fixing wall 510 provides the cover 600 with a plurality of movable coupling means for easy and quick opening and closing, and a sealing block for the cleaning opening 500 is formed by pressing a sealing member 610 provided between the cover 600 and the cleaning opening 500 during the process of closing the cleaning opening 500 by the cover 600. The cleanout 500 extends from the side wall, which allows the cleanout 500 to present a length of the retaining wall 510, the retaining wall 510 can be further machined to obtain a mating surface that is secured and mated with the cover 600.

The cleaning opening 500 is circular, and the cross section is circular on the fixing wall 510, the cover 600 can adopt a threaded connection, a bayonet connection, a connection mode of matching a folding connection piece with a buckle, and the like, so that the cover 600 can be quickly opened and closed under the manual operation. The sealing member 610 may be a sealing sheet, a sealing ring, a sealing plug, or the like, one end of the sealing member 610 is fixed to a surface of the cover 600 facing the cleaning opening 500, and when the cover 600 is closed, the cover 600 is pressed against the fixing wall 510 of the cleaning opening 500 to close the cleaning opening 500.

After the cleaning opening 500 is opened, a strip-shaped tool, such as a common screwdriver, a hard thin rod, etc., can be used to loosen the sand accumulated in the gap and the periphery of the elastic restoring member 410 when entering from the cleaning opening 500. Meanwhile, the cleaning opening 500 is over against the elastic reset piece 410, so that maintenance personnel can conveniently and quickly remove the blockage, and the cleaning device can also be operated in an environment with insufficient illumination. The cleaning is simpler and more convenient, and the efficiency is higher.

The two ends of the valve body 110 are narrow, the middle of the valve body is wide, the flow inside the check valve is guaranteed, when the blocking flap 420 ascends, water flows to the upper opening 200 through the periphery of the blocking flap 420, the flow area around the valve body 110 after the blocking flap 420 is completely opened is increased due to the design of the middle width of the valve body, and the resistance of the valve body 110 to the water is reduced. The purge port 500 is located on a side wall of the middle portion of the valve body 110, and in particular, a center line of a cross section of the purge port 500 is perpendicular to center lines of the upper opening 200, the lower opening 300, and the self-resetting check dam 400. The purge port 500 and the self-resetting unidirectional barrier 400 do not interfere with each other and do not affect each other.

As shown in fig. 4, the upper opening 200 is provided with a fixing arm 210 for fixing the elastic restoring member 410; one end of the fixing arm 210 is connected with the center of the upper opening 200 to form a mounting position 211, and the other end is connected with the edge of the upper opening 200; one end of the elastic reset piece 410 is fixed on the mounting position 211. Securing resilient return member 410 by securing arm 210 helps to reduce obstruction of upper opening 200. The fixing arm 210 is a strip-shaped fixing part, the fixing arm 210 generally has a combination of two, three, and four, when the fixing arm 210 is two, the two fixing arms 210 are in a straight line, and when the fixing arm 210 is three or more, the included angle between the fixing arm 210 and the fixing arm 210 is consistent; the fixed arms 210 can be further arranged into three arms, and the fixed arms are mutually 120 ℃, so that the uniform stress of each fixed arm 210 is ensured, and the shielding of the fixed arms 210 on the upper opening 200 is reduced to a greater extent.

The lower opening 300 and the upper opening 200 are provided with flanges and are suitable for a pipe body with a pipe diameter of 40mm to 500 mm. The flange is beneficial to saving space, reducing weight and having good sealing performance. The check valve is applicable to the body that the pipe diameter is between 40mm to 500mm, and the body is big more, and the volume of check valve is big more, owing to be used for the drainage of underground silt content, the easy frequent emergence of check valve undersize is blockked up to need frequent clearance, be unfavorable for going on smoothly of drainage operation.

The barrier flap 420 is cast iron and is fully lined with nitrile rubber. The structure of cast iron and full lining nitrile rubber makes stop flap 420 have better oil resistance, wearability and heat resistance, nitrile rubber plays the effect of protection cast iron, has covered a layer of protective layer on the cast iron equivalently, has insulated the contact of cast iron and water, prevents that the cast iron from soaking in water for a long time and oxidizing and rusting, and certain elasticity that nitrile rubber itself has can take place slight deformation when extrusion lower opening 300 edge, has avoided the contact between cast iron and the metallic valve body 110, is favorable to the sealed of lower opening 300. The bottom of the stop flap 420 is provided with a ring of annular bead 421 of nitrile rubber. The annular bead 421 of nitrile rubber helps to cushion the impact of the baffle flaps 420 against the edge of the lower opening 300. The annular bead 421 better forms a seal between the baffle 420 and the lower opening 300.

Example 2

As shown in fig. 2, the present embodiment is a self-purging check valve including: a valve body 110 provided with an upper opening 200 and a lower opening 300, disposed in the pipe; a self-resetting one-way blocking piece 400 is arranged between the upper opening 200 and the lower opening 300 and is used for blocking the back flow of silt from the upper opening 200 to the lower opening 300; a drainage cavity 710 is arranged below the lower opening 300, a de-blocking flushing port 720 for flushing the self-resetting one-way blocking element 400 is arranged in the valve body 110, and the drainage cavity 710 is communicated with the interior of the valve body 110 through the de-blocking flushing port 720.

The design of check valve stops the silt of backward flow outside the outlet to guarantee that the drain pump can not block up. However, the accumulation position of the transferred silt cannot completely solve the problem of blockage, and a drainage chamber 710 is further provided below the lower opening 300, wherein the drainage chamber 710 is a cavity formed below the lower opening 300 blocked by the self-resetting one-way blocking member 400 and the sidewall of the valve body 110 extends downwards. The upper opening 200 is provided with a pipe connector capable of being detachably connected with the pipe, and the lower part of the drainage cavity 710 is also provided with a pipe connector capable of being detachably connected with the pipe. The drainage cavity 710 has an outward-communicating outlet, and the de-blocking flushing port 720 is formed in the side wall of the valve body 110 and is communicated with the outlet, so that the drainage cavity 710 is communicated with the interior of the valve body 110 blocked by the self-resetting one-way blocking member 400, and the back flow of silt is controlled by means of arranging a valve 731, controlling the size of a channel or adjusting the structure of the de-blocking flushing port 720 and the like.

The unblocking flushing port 720 is communicated with the interior of the valve body 110 through a bypass pipe 730, the unblocking flushing port 720 and a liquid outlet in the liquid guiding cavity 710 extend outwards of the valve body 110 to form a first connecting port and a second connecting port, one end of the bypass pipe 730 is connected with the first connecting port, and the other end of the bypass pipe 730 is connected with the second connecting port, so that the interior of the valve body 110 is communicated with the liquid guiding cavity 710. The self-resetting unidirectional barrier 400 includes: an elastic restoring member 410 fixed on the upper opening 200; a blocking flap 420 connected to the elastic restoring member 410 and closing the lower opening 300 by being pushed by the elastic restoring member 410; the de-blocking flushing port 720 faces the elastic restoring member 410, and the bypass pipe 730 and the de-blocking flushing port 720 can guide water flow to flush the elastic restoring member 410 when the blocking flap 420 cannot rise. The unblocking flushing port 720 is opposite to the elastic reset piece 410, so that after water enters the valve body 110 through the bypass pipe 730, the water can be concentrated and mainly used for flushing the elastic reset piece 410, and the introduced water flushing effect is more effective through the arrangement of the unblocking flushing port 720.

One end of the elastic resetting piece 410 is fixed on the upper opening 200, the other end is connected with the blocking flap 420, the lower part of the blocking flap 420 is a circular blocking piece, the circular blocking piece is used for sealing the lower opening 300, the upper part of the blocking flap 420 is a fixing position, and the fixing position is connected with the elastic resetting piece 410. The elastic restoring member 410 pushes the blocking flap 420 from the upper opening 200 to the lower opening 300 by its own elastic action until it contacts the edge of the lower opening 300, forming a closure of the lower opening 300. When the sewage pump drives the water body to enter the lower opening 300 of the check valve, the pressure of the water body is greater than the extrusion force of the elastic reset piece 410 to the blocking flap 420, the blocking flap 420 is pushed open, and the water body enters the valve body 110 and flows into the upper opening 200. When the water flow is active, the silt is continuously mixed with the water more evenly without causing blockage. However, as the pump down time increases, the accumulated silt is prone to caking, which can easily cause the check valve to block.

The bypass tube 730 can be in fluid communication with the deblock flush port 720. The articulating connection can facilitate replacement or rapid processing of the bypass tube 730.

Further, the bypass pipe 730 is a hard thin pipe, the pipe diameter of the bypass pipe 730 is reduced from large to small, the pipe diameter of the end connected with the drainage cavity 710 is large, and the pipe diameter of the end connected with the deblocking flushing port 720 is small.

As shown in fig. 3, a spring-controlled check 740 is disposed within the bypass tube, the check 740 comprising: a mounting part 741 provided on the bypass pipe at one end of the check member 740; a communicating part 742, which is a hollow pipe body, one end of which is communicated with the mounting part 741 and is provided with a water outlet 745 used for communicating with the outside; an elastic sleeve 743 wrapping the communicating part 742 and sealing the water outlet 745 by using the elastic contraction of the elastic sleeve; a release preventing portion 744 for blocking one end of the communicating portion 742 away from the mounting portion 741, and combining with the mounting portion 741 to fix the position of the elastic member 743; the water pressure entering the communicating part 742 is larger than the elastic contraction force of the elastic sleeve 743, the elastic sleeve 743 for plugging the water outlet 745 is expanded, and the water enters the bypass pipe through the check piece 740. By providing the check 740 in the bypass pipe 730, the bypass pipe 730 communicating the valve body 110 and the drainage chamber 710 can be designed without being blocked by the backflow of the check 740 without being controlled by the valve 731.

The backstop 740 can be used in conjunction with a soft bypass tube 730, the soft bypass tube 730 being a metal braided tube. Bypass pipe 730 cup joints on non return 740, and the one end that is close to the drainage chamber of bypass pipe 730 is fixed together with drainage chamber and installation department 741, connects through screw thread or card pressure mode, and drainage chamber and bypass pipe 730 communicate through non return 740. The release preventing portion 744 may have various shapes such as a ring shape and a cross shape, and has a cross section larger than the communicating portion 742, and is capable of preventing the elastic member 743 from coming off in cooperation with the mounting portion 741 having a cross section similarly larger than the communicating portion 742. The water outlet 745 is in a grid shape and plays a certain supporting role for the elastic sleeve 743.

When the anti-blocking check valve can not be normally opened, water of the submersible sewage pump enters the liquid guide cavity, the pressure of one side, close to the bypass pipe 730, of the check piece 740 is small, the pressure of one side, close to the liquid guide cavity, of the check piece is large, the water passes through the communicating part 742, the elastic sleeve 743 wrapping the check piece is spread, the water outlet 745 is communicated, the liquid guide cavity is communicated with the bypass pipe 730, and the water enters the anti-blocking check valve. When the anti-blocking check valve is normally opened, the pressures at the two ends of the check piece 740 are balanced, the elastic sleeve 743 blocks the water outlet 745 under the self elastic action, and the liquid guide cavity is not communicated any more. When the drainage operation is finished, the anti-blocking check valve is closed, one side of the check piece 740 close to the bypass pipe 730 is pressed to be large, the blocking of the water outlet 745 is increased by combining the elastic action of the elastic sleeve 743, and silt is prevented from flowing back through the bypass pipe 730.

The bypass tube 730 extends through the blind flushing port 720 and into the valve body 110 to form an extended flushing segment. The flushing segment serves to direct the flow of flushing water so that the flow of flushing water entering the valve body 110 is more concentrated and the location of flushing is more accurately directed toward the resilient return member 410, with the effect of the flow being more effective under the effect of the extended flushing segment. The bypass tube 730 extends and then penetrates through the blocking flushing port 720 to form an extension flushing section with a short length, the extension flushing section does not obstruct the lifting of the blocking flap 420, and the plane of the opening is parallel to the vertical plane. The extended flush segment is located in the lower middle portion of the valve body 110 and the barrier flap 420 is located above the extended flush segment when the valve body 110 is fully open.

The extension scouring section is provided with a movable end cover, the upper part of the end cover is movably connected with the upper part of the port of the excircle scouring section, and the end cover shields the port of the excircle scouring section under the action of gravity. The end cover utilizes self gravity to form a one-way turnover end cover at the opening of the epitaxial scouring section, so that the epitaxial scouring section is in one-way conduction, and the problem that silt flows back to the liquid guide cavity 710 through the bypass pipe 730 is thoroughly solved.

The end cover can turn over and move, the movable included angle between the end cover and the opening is smaller than 180 degrees, and the end cover is limited to turn over through a limiter arranged on the movable connection. Preferably, the movable included angle between the end cap and the opening is less than 90 °. Under the action of gravity, the end cover can automatically reduce the included angle between the end cover and the opening, and finally the opening is closed. When water flows out through the ramp 733, the water presses against the end cap, which is pushed open, thereby forcing water into the valve body 110.

The end cover is provided with a bulge formed by intersecting two inclined planes. The bulge on the end cover can be used for pushing away the blocked silt when the silt is blocked, so that the end cover can be opened more easily. The protrusion forms a protrusion line which is arranged in the middle of the vertical direction of the end cover. The upper end of the convex line is tightly attached to the upper part of the end cover, and the lower end of the convex line keeps a certain distance from the end cover to form a convex with a light upper part and a heavy lower part, so that the action of gravity on the end cover is more obvious.

A fixing arm 210 for fixing the elastic reset piece 410 is arranged on the upper opening 200; one end of the fixing arm 210 is connected with the center of the upper opening 200 to form a mounting position 211, and the other end is connected with the edge of the upper opening 200; one end of the elastic reset piece 410 is fixed on the mounting position 211. Securing resilient return member 410 by securing arm 210 helps to reduce obstruction of upper opening 200. The fixing arm 210 is a strip-shaped fixing part, the fixing arm 210 generally has a combination of two, three, and four, when the fixing arm 210 is two, the two fixing arms 210 are in a straight line, and when the fixing arm 210 is three or more, the included angle between the fixing arm 210 and the fixing arm 210 is consistent; the fixed arms 210 can be further arranged into three arms, and the fixed arms are mutually 120 ℃, so that the uniform stress of each fixed arm 210 is ensured, and the shielding of the fixed arms 210 on the upper opening 200 is reduced to a greater extent.

The lower opening 300 and the upper opening 200 are provided with flanges and are suitable for a pipe body with a pipe diameter of 40mm to 500 mm. The flange is beneficial to saving space, reducing weight and having good sealing performance. The check valve is applicable to the body that the pipe diameter is between 40mm to 500mm, and the body is big more, and the volume of check valve is big more, owing to be used for the drainage of underground silt content, the easy frequent emergence of check valve undersize is blockked up to need frequent clearance, be unfavorable for going on smoothly of drainage operation.

The barrier flap 420 is cast iron and is fully lined with nitrile rubber. The structure of cast iron and full lining nitrile rubber makes stop flap 420 have better oil resistance, wearability and heat resistance, nitrile rubber plays the effect of protection cast iron, has covered a layer of protective layer on the cast iron equivalently, has insulated the contact of cast iron and water, prevents that the cast iron from soaking in water for a long time and oxidizing and rusting, and certain elasticity that nitrile rubber itself has can take place slight deformation when extrusion lower opening 300 edge, has avoided the contact between cast iron and the metallic valve body 110, is favorable to the sealed of lower opening 300. The bottom of the stop flap 420 is provided with a ring of annular protrusions of nitrile rubber. The annular protrusion of nitrile rubber helps to mitigate the impact of the baffle flap 420 against the edge of the lower opening 300. The annular protrusion better forms a seal between the baffle 420 and the lower opening 300.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A self purging check valve comprising:

the valve body is provided with an upper opening and a lower opening and is arranged in the pipeline;

a self-resetting one-way blocking piece is arranged between the upper opening and the lower opening and is used for blocking the back flow of silt from the upper opening to the lower opening;

it is characterized in that the preparation method is characterized in that,

and a liquid guide cavity is arranged below the lower opening, a blockage removing flushing opening for flushing the self-resetting one-way blocking piece is arranged in the valve body, and the liquid guide cavity is communicated with the inside of the valve body through the blockage removing flushing opening.

2. A self-cleaning check valve as recited in claim 1, wherein the de-clog flushing port communicates with the interior of the valve body through a bypass line, the bypass line being valved at an end adjacent the de-clog flushing port.

3. The self purging check valve of claim 2, wherein the self resetting one way check member comprises:

the elastic reset piece is fixed on the upper opening;

the blocking flap is connected with the elastic resetting piece and is pushed by the elastic resetting piece to close the lower opening;

the blocking-removing flushing port is right opposite to the elastic reset piece, and the bypass pipe and the blocking-removing flushing port can guide water flow to flush the elastic reset piece when the blocking flap cannot rise.

4. A self-cleaning check valve as recited in claim 2, wherein the bypass line is in fluid communication with the de-clog flushing port.

5. A self cleaning check valve as recited in claim 2, wherein a spring controlled check is provided within the bypass conduit, the check comprising:

the mounting part is positioned at one end of the check piece and arranged on the bypass pipe;

the communicating part is a hollow pipe body, one end of the communicating part is communicated with the mounting part, and a water outlet used for being communicated with the outside is arranged;

the elastic sleeve wraps the communication part and seals the water outlet by utilizing the elastic contraction of the elastic sleeve;

the separation blocking part is used for blocking one end of the communicating part, which is far away from the mounting part, and is combined with the mounting part to form fixation of the position of the elastic sleeve;

the pressure of the water body entering the communicating part is larger than the elastic contraction force of the elastic sleeve, the elastic sleeve for plugging the water outlet is expanded, and the water body enters the bypass pipe through the check piece.

6. A self-cleaning check valve as recited in claim 2, wherein the bypass tube extends through the blind flush port and into the valve body to form an extended flush segment.

7. A self-cleaning check valve according to claim 6, wherein the extension flushing section is provided with a movable end cap, the upper part of the end cap is movably connected with the upper part of the port of the excircle flushing section, and the end cap shields the port of the excircle flushing section through the action of gravity.

8. The self cleaning check valve of claim 7, wherein the end cap has a protrusion formed by the intersection of two inclined surfaces.

9. A self-cleaning check valve according to any of claims 1 to 8, wherein the side wall of the valve body is provided with openings along which the side wall extends outwardly to form openable scavenge ports which allow for the removal of silt build-up as the resilient return member is flushed.

10. A self-cleaning check valve as recited in claim 9, wherein the purge port is provided with a cap having a seal, the cap being movably connected to the purge port and being a manually actuatable member.

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