Improved double-clack check valve

Abstract

The improved double-clack check valve comprises a valve body, valve clacks, a torsional spring and a filter screen, a liquid inlet channel and a liquid outlet channel are formed in the two ends of the valve body correspondingly and communicate with each other, the diameter of the liquid inlet channel is smaller than that of the liquid outlet channel, and a middle beam is connected to the inner wall of the liquid inlet channel; the valve clacks are rotationally embedded in the liquid outlet channel, the rotating axis of the valve clacks is parallel to the length direction of the middle beam, the two valve clacks are symmetrically distributed in the direction perpendicular to the length direction of the middle beam, the torsional spring is connected between the two valve clacks, the torsional spring enables the valve clacks to be provided with the inner wall abutting against the side, close to the liquid inlet channel, of the liquid outlet channel, and the filter screen is embedded in the liquid inlet channel. The filter screen is embedded in the liquid inlet channel, impurities contained in water flow entering the liquid inlet channel are filtered, the possibility that the impurities in the water make contact with the valve clack and abrade the valve clack is reduced, and the service life of the valve clack is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to an improved double-flap check valve. Background Art

[0002] There are many types of check valves commonly found on the market, mainly including swing check valves, lift check valves, butterfly check valves, etc.

[0003] The wafer-type double-flap check valve is used for pure pipelines and industrial, environmental protection, water treatment, and high-rise building water supply and drainage pipelines to prevent the reverse flow of the medium. The check valve adopts a wafer-type, the butterfly plate is two semicircles, and a spring is used for forced reset. The sealing surface can be a body welded wear-resistant material or lined with rubber. It has a wide range of uses and reliable sealing. When the existing wafer-type double-flap check valve is in use, impurities in the water impact the valve disc, and a long period of impact will cause the valve disc to be damaged. Summary of the invention

[0004] In order to reduce the possibility of impurities in the water wearing out the valve disc and increase the service life of the valve disc, the present application provides an improved double-disc check valve.

[0005] The improved double-flap check valve provided in this application adopts the following technical solution: An improved double-flap check valve comprises a valve body, a valve disc, a torsion spring and a filter screen, wherein a liquid inlet channel and a liquid outlet channel are respectively arranged at two ends of the valve body, the liquid inlet channel and the liquid outlet channel are connected, the diameter of the liquid inlet channel is smaller than the diameter of the liquid outlet channel, a middle beam is connected to the inner wall of the liquid inlet channel, the valve disc is rotatably embedded in the liquid outlet channel, the rotation axis of the valve disc is parallel to the length direction of the middle beam, two valve discs are provided, and the two valve discs are symmetrically distributed along a direction perpendicular to the length direction of the middle beam, the torsion spring is connected between the two valve discs, the torsion spring enables the valve disc to press against the inner wall of the liquid outlet channel close to the liquid inlet channel, and the filter screen is embedded in the liquid inlet channel.

[0006] By adopting the above technical solution, the filter is embedded in the liquid inlet channel to filter impurities contained in the water flow entering the liquid inlet channel, thereby reducing the possibility of impurities in the water contacting the valve disc and causing wear to the valve disc, thereby increasing the service life of the valve disc.

[0007] Preferably, it also includes a sealing ring, a first reset member, a sealing strip and a second reset member, wherein a first sealing groove is provided on a side of the valve disc close to the liquid inlet channel, the first sealing groove extends circumferentially along the valve disc, the number of the sealing rings is the same as the number of the first sealing grooves and corresponds one to one, the sealing ring is slidably embedded in the first sealing groove, the sliding direction of the sealing ring is parallel to the thickness direction of the valve disc, the sealing ring is used to press against the inner wall of the liquid outlet channel close to the liquid inlet channel, the first reset member is connected between the sealing ring and the valve disc, the first reset member makes the sealing ring have a tendency to extend out of the first sealing groove, the second sealing groove is provided on the side of the middle beam close to the liquid outlet channel, the sealing strip is slidably embedded in the second sealing groove, the sliding direction of the sealing strip is parallel to the axial direction of the liquid outlet channel, the sealing strip is used to press against the valve disc, the second reset member is connected between the sealing strip and the middle beam, and the second reset member makes the sealing strip have a tendency to press against the valve disc.

[0008] By adopting the above technical solution, when the sealing ring is worn, the first reset member drives the sealing ring to slide against the inner wall of the liquid outlet channel close to the liquid inlet channel. When the sealing strip is worn, the second reset member drives the sealing strip to press against the valve flap, thereby reducing the possibility of leakage at the connection between the valve flap and the valve body and improving the sealing between the valve flap and the valve body.

[0009] Preferably, it also includes a connecting column and a fixed block, a connecting hole is provided at the bottom of the second sealing groove, the connecting hole is connected to the liquid inlet channel, one end of the connecting column is connected to the sealing strip, and the other end of the connecting column extends into the liquid inlet channel after passing through the connecting hole, the filter is coaxially connected with a mounting sleeve, the mounting sleeve is coaxially slidably connected to the end of the connecting column away from the sealing strip, the fixed block is slidably connected to the connecting column, the sliding direction of the fixed block is perpendicular to the axial direction of the connecting column, and a fixing groove is provided on the inner wall of the mounting sleeve, and the fixing groove is used for the fixing block to be embedded.

[0010] By adopting the above technical solution, a connecting column is provided for installing the filter, a fixed block is slidably connected to the connecting column, and the fixed block is embedded in the fixed groove, so that the connecting column and the filter are relatively fixed. When the sealing strip slides, the filter is driven to slide, and the filter is driven to disturb the water flow in the liquid inlet channel through the opening and closing of the valve disc, so as to clean the filter, reduce the possibility of clogging of the filter holes, and ensure the normal use of the filter.

[0011] Preferably, a mounting groove is provided on the outer periphery of one end of the connecting column away from the sealing strip, the wall of the mounting groove fits with the inner wall of the mounting sleeve, and the bottom of the mounting groove abuts against one end of the mounting sleeve close to the liquid outlet channel.

[0012] By adopting the above technical solution, an installation groove is provided on the outer periphery of the connecting column, the wall of the installation groove fits with the inner wall of the installation sleeve, and the bottom of the installation groove abuts against the installation sleeve, which makes it easy to embed the fixing block into the fixing groove to achieve relative fixation of the filter screen and the connecting column, thereby improving installation efficiency.

[0013] Preferably, it also includes a third reset member, an unlocking column and a fourth reset member, an unlocking groove is provided at the end of the connecting column away from the sealing strip, the unlocking column is slidably embedded in the unlocking groove, the sliding direction of the unlocking column is parallel to the axial direction of the connecting column, the fourth reset member is connected between the unlocking column and the connecting column, the fourth reset member makes the end of the unlocking column away from the sealing strip have a tendency to extend out of the unlocking groove, the third reset member is connected between the fixed block and the connecting column, the third reset member makes the fixed block have a tendency to press against the outer wall of the unlocking column, the outer periphery of the unlocking column is connected with a convex ring, the outer periphery of the convex ring away from the sealing strip is provided with a first chamfer, and the first chamfer is used to abut against the fixed block.

[0014] By adopting the above technical solution, when installing or removing the filter, the unlocking column is pressed, and the fixed block is disengaged from the fixed groove under the action of the elastic force of the third reset piece, thereby releasing the lock of the fixed block on the filter. After releasing the unlocking column, the unlocking column extends out of the unlocking groove under the action of the elastic force of the fourth reset piece, and the first chamfer abuts the fixed block, pushing the fixed block to embed into the fixed groove, and the fixed block abuts the outer wall of the protrusion, thereby improving the stability of the connection between the connecting column and the filter.

[0015] Preferably, it also includes a locking column and a fifth reset piece, the connecting column is provided with a first sliding groove, the first sliding groove connects the connecting hole and the unlocking groove, the locking column is slidably embedded in the first sliding groove, the sliding direction of the locking column is perpendicular to the axial direction of the connecting column, the fifth reset piece is connected between the locking column and the connecting column, and the fifth reset piece makes the end of the locking column away from the unlocking groove have a tendency to extend out of the first sliding groove, the hole wall of the connecting hole is provided with an embedding groove, the embedding groove is used for the end of the locking column away from the unlocking groove to be embedded, the outer periphery of the end of the locking column away from the unlocking groove is provided with a first rounded corner, the first rounded corner is used to abut against the groove wall of the embedding groove, and the side wall of the unlocking column is provided with a locking groove, and the locking groove is used for the other end of the locking column to be embedded.

[0016] By adopting the above technical scheme, when the valve disc is closed, one end of the locking column is embedded in the embedding groove, and the other end of the locking column is disengaged from the locking groove, which is convenient for pushing the unlocking column to realize the disassembly and assembly of the filter screen. When the valve disc is opened, the sealing strip slides, driving the connecting column to slide, driving the locking column to slide, and the first fillet abuts against the wall of the embedding groove, pushing the locking column to embed into the first slide groove and into the locking groove, thereby realizing the relative fixation of the unlocking column and the connecting column, reducing the possibility of water flow impact or impurities in the water flow hitting the unlocking column during the use of the stop valve, locking the unlocking column to extend into the unlocking groove, releasing the lock of the filter screen and the connecting column, making the filter screen detachable from the connecting column, and improving the reliability of the check valve.

[0017] Preferably, it also includes a sliding seat, a sixth reset member, a rack, a seventh reset member, a gear and a knocking block, the sliding seat is coaxially slidably embedded in the liquid inlet channel, the filter is connected to the sliding seat, the sixth reset member is connected between the sliding seat and the valve body, the sixth reset member makes the sliding seat have a tendency to move away from the liquid outlet channel, the rack is slidably connected to the valve body, the sliding direction of the rack is parallel to the sliding direction of the sliding seat, one end of the rack away from the liquid outlet channel abuts the sliding seat, the seventh reset member is connected between the rack and the valve body, the seventh reset member makes the rack have a tendency to move away from the liquid outlet channel, the gear is rotatably connected to the valve body, the rotation axis of the gear is perpendicular to the axial direction of the liquid outlet channel, the gear is meshed with the rack, one end of the knocking block is connected to the rack, and the other end of the knocking block is used to knock the sliding seat.

[0018] By adopting the above technical scheme, when the valve disc is opened, the sealing strip slides, driving the connecting column to slide, driving the filter to slide, driving the sliding seat to slide, abutting the rack, driving the gear to rotate, driving the knocking block to rotate; the valve disc is closed, abutting the sealing strip, driving the connecting column to slide, driving the filter to slide, driving the sliding seat to slide, abutting the rack, driving the gear to rotate, driving the knocking block to rotate and knock the sliding seat, causing the sliding seat to vibrate, driving the filter to vibrate, and shaking off impurities on the filter, thereby ensuring the normal use of the filter and improving the reliability of the check valve.

[0019] Preferably, a groove is provided on the inner wall of the liquid outlet channel, and the groove is used for the knocking block to be embedded.

[0020] By adopting the above technical solution, when the valve disc is opened, the knocking block is embedded in the groove, reducing the resistance of the knocking block to the water flow in the check valve, and improving the flow efficiency of the water flow in the check valve.

[0021] Preferably, it also includes a positioning block, an eighth reset member, an abutment block and a ninth reset member, the positioning block being slidably connected to the rack, the sliding direction of the positioning block being perpendicular to the sliding direction of the rack, the valve body being provided with a positioning groove, the positioning groove being used for the positioning block to be embedded, the eighth reset member being connected between the positioning block and the rack, the eighth reset member making the positioning block have a tendency to be embedded in the positioning groove, the abutment block being slidably embedded in the positioning groove, the sliding direction of the abutment block being parallel to the sliding direction of the rack, one end of the abutment block extending into the liquid outlet channel for the valve disc to abut, the end of the positioning block away from the rack being provided with a second chamfer, the second chamfer being located on the side of the positioning block close to the liquid outlet channel, the second chamfer being used for the abutment block to abut, the ninth reset member being connected between the abutment block and the valve body, the ninth reset member making the abutment block have a tendency to extend into the liquid outlet channel.

[0022] By adopting the above technical solution, when the valve disc is opened, the ninth reset member drives the abutment block to extend out of the liquid outlet channel, and the rack slides so that the positioning block is aligned with the positioning groove, and the eighth reset member drives the positioning block to extend into the positioning groove, so that the rack and the valve body are relatively fixed. When the valve disc is closed, the valve disc abuts the abutment block, pushing the abutment block to abut the second chamfer, pushing the positioning block out of the positioning groove, and releasing the relative fixation of the rack and the valve body. The rack slides under the elastic force of the seventh reset member, driving the gear to rotate, driving the knocking block to rotate and knock the sliding seat, thereby increasing the knocking force of the knocking block on the sliding seat and improving the cleaning effect of the filter.

[0023] Preferably, a lifting lug is connected to the outer periphery of the valve body.

[0024] By adopting the above technical solution, a lifting lug is provided on the outer periphery of the valve body, which is convenient for lifting and transporting the check valve when installing or threatening the check valve, and is convenient for assembling the check valve, thereby improving the assembly efficiency of the check valve.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The filter is embedded in the liquid inlet channel to filter the impurities contained in the water entering the liquid inlet channel, reduce the possibility of impurities in the water contacting the valve disc and causing wear to the valve disc, and increase the service life of the valve disc; 2. When the sealing ring is worn, the first reset member drives the sealing ring to slide against the inner wall of the liquid outlet channel close to the liquid inlet channel. When the sealing strip is worn, the second reset member drives the sealing strip to press against the valve disc, thereby reducing the possibility of leakage at the connection between the valve disc and the valve body and improving the sealing between the valve disc and the valve body. 3. When the valve disc is opened, the sealing strip slides, driving the connecting column to slide, driving the filter to slide, driving the sliding seat to slide, abutting the rack, driving the gear to rotate, driving the knocking block to rotate; when the valve disc is closed, it abuts the sealing strip, driving the connecting column to slide, driving the filter to slide, driving the sliding seat to slide, abutting the rack, driving the gear to rotate, driving the knocking block to rotate and knock on the sliding seat, causing the sliding seat to vibrate, driving the filter to vibrate, and shaking off the impurities on the filter, thereby ensuring the normal use of the filter and improving the reliability of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of an improved double-flap check valve.

[0027] Figure 2 It is a structural diagram of an improved double-flap check valve.

[0028] Figure 3 yes Figure 1 Enlarged view of point A in the middle.

[0029] Figure 4 yes Figure 1 Enlarged view of point B in the middle.

[0030] Figure 5 It is a partial cross-sectional view of the improved double-flap check valve.

[0031] Description of reference numerals: 1. Valve body; 11. Liquid inlet channel; 12. Liquid outlet channel; 13. Middle beam; 131. Second sealing groove; 132. Communication hole; 133. Embedded groove; 14. Groove; 15. Positioning groove; 16. Lifting ear; 17. Abutment ring; 18. Sliding cavity; 19. Third chamfer; 110. First rotating shaft; 111. Second sliding groove; 112. Rotation groove; 113. Second guide groove; 114. Communication groove; 115. Fourth guide groove; 2. Valve disc; 21. First sealing groove; 3. Torsion spring; 4. filter screen; 41. mounting sleeve; 411. fixing groove; 42. limit block; 5. Sealing mechanism; 51. Sealing ring; 52. First reset member; 53. Sealing strip; 531. Fourth chamfer; 54. Second reset member; 6. Connecting mechanism; 61. Connecting column; 611. Mounting slot; 612. Unlocking slot; 613. First slide slot; 614. Third slide slot; 615. Third guide slot; 62. Fixing block; 621. Fifth chamfer; 622. Third guide block; 63. Third reset member; 64. Unlocking column; 641. Protruding ring; 6411. First chamfer; 6412. Locking slot; 65. Fourth reset member; 66. Locking column; 661. First fillet; 662. Sixth chamfer; 67. Fifth reset member; 7. Cleaning mechanism; 71. Sixth reset member; 72. Sliding seat; 721. Limiting groove; 722. Guide column; 723. Accommodating groove; 724. Seventh chamfer; 725. Second guide block; 73. Knocking assembly; 731. Rack; 7311. Abutment rod; 732. Seventh reset member; 733. Gear; 734. Knocking block; 735. Positioning block; 7351. Second chamfer; 736. Eighth reset member; 737. Second rotating shaft; 738. Protrusion; 7381. Fifth slide groove; 74. Unlocking assembly; 741. Abutment block; 7411. Fourth guide block; 742. Ninth reset member. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figure 1The embodiment of the present application discloses an improved double-flap check valve including a valve body 1. A liquid outlet channel 12 is coaxially provided at one end of the valve body 1, and an abutment ring 17 is coaxially fixedly connected to the inner wall of the liquid outlet channel 12 near the other end of the valve body 1. A liquid inlet channel 11 is coaxially provided at the other end of the valve body 1, and the liquid inlet channel 11 is connected to the liquid outlet channel 12. The diameter of the liquid inlet channel 11 is smaller than the diameter of the liquid outlet channel 12, and the inner wall of the liquid inlet channel 11 is flush with the inner wall of the abutment ring 17. A sliding cavity 18 is coaxially provided at the inner wall of the liquid inlet channel 11 away from the end of the liquid outlet channel 12, and a third chamfer 19 is provided at the bottom of the sliding cavity 18. A middle beam 13 is fixedly connected to the inner wall of the liquid inlet channel 11, and the length direction of the middle beam 13 is perpendicular to the axial direction of the liquid inlet channel 11. The side surface of the middle beam 13 close to the liquid outlet channel 12 is flush with the side surface of the abutment ring 17 away from the liquid inlet channel 11. The side surface of the middle beam 13 away from the liquid outlet channel 12 is located on the side of the bottom of the sliding cavity 18 close to the liquid inlet channel 11. A lifting ear 16 is fixedly connected to the outer wall of the valve body 1.

[0034] Reference Figure 1 and Figure 2 , an improved double-flap check valve also includes a valve flap 2 and a torsion spring 3. A first rotating shaft 110 is fixedly connected to the inner wall of the liquid outlet channel 12, and the axial direction of the first rotating shaft 110 is parallel to the length direction of the middle beam 13, and the axis of the first rotating shaft 110 is coplanar with the axis of the valve body 1. The valve flap 2 is rotatably embedded in the liquid outlet channel 12, and the rotation axis of the valve flap 2 coincides with the axis of the first rotating shaft 110. The side surface of the valve flap 2 close to the liquid inlet channel 11 is used to abut against the abutment ring 17 and the side surface of the middle beam 13 away from the sliding cavity 18. Two valve flaps 2 are provided, and the two valve flaps 2 are symmetrically distributed along a direction perpendicular to the rotation axis of the valve flap 2. The torsion spring 3 is connected between the two valve flaps 2, and the torsion spring 3 makes the valve flap 2 have a tendency to close the liquid inlet channel 11.

[0035] Reference Figure 1 , an improved double-flap check valve also includes a sealing mechanism 5. The sealing mechanism 5 includes a sealing ring 51 and a first reset member 52. A first sealing groove 21 is provided on a side of the valve disc 2 close to the abutting ring 17. The first sealing groove 21 is arranged along the circumference of the valve disc 2. The number of sealing rings 51 is the same as the number of first sealing grooves 21 and corresponds to each other. The sealing ring 51 is slidably embedded in the first sealing groove 21. The sliding direction of the sealing ring 51 is parallel to the sliding direction of the valve disc 2. The sealing ring 51 is used to press against the side surface of the abutting ring 17 away from the liquid inlet channel 11. The first reset member 52 is connected between the sealing ring 51 and the valve disc 2. The first reset member 52 makes the sealing ring 51 have a tendency to extend out of the first sealing groove 21. In this embodiment, one end of the first reset member 52 is connected to one end of the sealing ring 51 close to the bottom of the first sealing groove 21, and the other end of the first reset member 52 is connected to the bottom of the first sealing groove 21. A plurality of first reset members 52 are provided, and the plurality of first reset members 52 are evenly distributed along the circumference of the sealing ring 51.

[0036] The sealing mechanism 5 also includes a sealing strip 53 and a second reset member 54. A second sealing groove 131 is provided on one side of the middle beam 13 close to the liquid inlet channel 11. The sealing strip 53 is slidably embedded in the second sealing groove 131. The sliding direction of the sealing strip 53 is parallel to the axial direction of the valve body 1. A fourth chamfer 531 is provided on one end of the sealing strip 53 close to the liquid outlet channel 12. There are two fourth chamfers 531. The two fourth chamfers 531 are respectively located on both sides of the sealing strip 53 along the length direction perpendicular to the middle beam 13. The fourth chamfer 531 is used to abut against the surface of one side of the valve flap 2 close to another valve flap 2. The second reset member 54 is connected between the middle beam 13 and the sealing strip 53. The second reset member 54 makes the sealing strip 53 have a tendency to abut against the valve flap 2. In this embodiment, the second return member 54 is a spring, one end of the second return member 54 is connected to one end of the sealing strip 53 close to the bottom of the second sealing groove 131, and the other end of the second return member 54 is connected to the bottom of the second sealing groove 131. Five second return members 54 are provided, and the five second return members 54 are evenly distributed along the length direction of the middle beam 13.

[0037] Reference Figure 1 and Figure 3 An improved double-flap check valve further includes a filter screen 4 and a connecting mechanism 6, the connecting mechanism 6 includes a connecting column 61, a connecting hole 132 is provided at the bottom of the second sealing groove 131, the connecting hole 132 is connected to the liquid inlet channel 11, and the axis of the connecting hole 132 coincides with the axis of the valve body 1. One end of the connecting column 61 is fixedly connected to one end of the sealing strip 53 close to the bottom of the second sealing groove 131, the connecting column 61 is coaxially slidably embedded in the connecting hole 132, and the other end of the connecting column 61 extends into the sliding cavity 18. The filter screen 4 is slidably embedded in the sliding cavity 18, and the sliding direction of the filter screen 4 is parallel to the sliding direction of the connecting column 61. The filter screen 4 is coaxially fixedly connected with a mounting sleeve 41, and a mounting groove 611 is coaxially provided on the outer periphery of the connecting column 61 away from the sealing strip 53. The mounting sleeve 41 is coaxially slidably embedded in the mounting groove 611, and the inner wall of the mounting sleeve 41 is in contact with the groove wall of the mounting groove 611, and the end of the mounting sleeve 41 close to the liquid outlet channel 12 abuts against the bottom of the mounting groove 611.

[0038] Reference Figure 3The connection mechanism 6 also includes an unlocking column 64, a fourth reset member 65, a fixed block 62 and a third reset member 63. An unlocking groove 612 is coaxially provided at one end of the connection column 61 away from the sealing strip 53, and the unlocking column 64 is coaxially slidably embedded in the unlocking groove 612. The fourth reset member 65 is connected between the unlocking column 64 and the connection column 61. The fourth reset member 65 makes the end of the unlocking column 64 away from the liquid outlet channel 12 have a tendency to extend out of the unlocking groove 612. In this embodiment, the fourth reset member 65 is a spring, one end of the fourth reset member 65 is connected to the end of the unlocking column 64 close to the unlocking groove 612, and the other end of the fourth reset member 65 is connected to the bottom of the unlocking groove 612. A third slide groove 614 is provided at the wall of the unlocking groove 612, and the third slide groove 614 is connected to the mounting groove 611. There are four third slide grooves 614, and the four third slide grooves 614 are evenly distributed around the axis of the connection column 61. The number of the fixed block 62 and the third reset member 63 is the same as the number of the third slide groove 614 and corresponds to each other. The fixed block 62 is slidably embedded in the third slide groove 614. The side wall of the fixed block 62 is in contact with the side wall of the third slide groove 614. The inner wall of the mounting sleeve 41 is provided with a fixed groove 411. The number of the fixed groove 411 is the same as the number of the fixed block 62 and corresponds to each other. The fixed groove 411 is used for the fixed block 62 to be embedded. The outer wall of the fixed block 62 away from the unlocking groove 612 is provided with a fifth chamfer 621. The fifth chamfer 621 is used to abut against the groove wall of the fixed groove 411. The groove wall of the third slide groove 614 is provided with a third guide groove 615. The side wall of the fixed block 62 is fixedly connected with a third guide block 622. The third guide block 622 is slidably embedded in the third guide groove 615. The third reset member 63 is connected between the connecting column 61 and the third guide block 622. The third reset member 63 makes the fixed block 62 have a tendency to abut against the outer wall of the unlocking column 64. In this embodiment, the third return member 63 is a spring, one end of the third return member 63 is connected to the side wall of the third guide block 622 away from the unlocking groove 612, and the other end of the third return member 63 is connected to the side surface of the third guide block 622 away from the unlocking groove 612. The end of the unlocking column 64 close to the bottom of the unlocking groove 612 is coaxially fixedly connected with a convex ring 641, and the outer periphery of the end of the convex ring 641 away from the bottom of the unlocking groove 612 is provided with a first chamfer 6411, and the first chamfer 6411 is used to abut against the fixed block 62.

[0039] The connection mechanism 6 further includes a locking column 66 and a fifth reset member 67. A first slide groove 613 is provided at the wall of the locking groove 6412, and the first slide groove 613 is communicated with the connecting hole 132. There are three first slide grooves 613, and the three first slide grooves 613 are evenly distributed around the axis of the connecting column 61. The number of the locking column 66 and the fifth reset member 67 is the same as the number of the first slide grooves 613 and corresponds to one another. The locking column 66 is coaxially slidably embedded in the first slide groove 613, and the outer wall of the locking column 66 is in contact with the wall of the first slide groove 613. An embedding groove 133 is provided at the wall of the connecting hole 132, and the embedding groove 133 is used for embedding one end of the locking column 66 away from the unlocking groove 612. A locking groove 6412 is provided at the outer wall of the unlocking column 64, and the locking groove 6412 is used for embedding the other end of the locking column 66. The number of the embedding groove 133 and the locking groove 6412 is the same as the number of the locking column 66 and corresponds to one another. The outer periphery of the locking column 66 at one end away from the unlocking groove 612 is provided with a first rounded corner 661, and the first rounded corner 661 is used to abut against the groove wall of the embedding groove 133. The outer periphery of the other end of the locking column 66 is provided with a sixth chamfer 662, and the sixth chamfer 662 is used to abut against the groove wall of the locking groove 6412. The fifth reset member 67 is connected between the locking column 66 and the connecting column 61, and the fifth reset member 67 makes the locking column 66 have a tendency to extend out of the first sliding groove 613. Reference Figure 1 and Figure 4 , an improved double-flap check valve also includes a cleaning mechanism 7, which includes a sliding seat 72 and a sixth reset member 71. The sliding seat 72 is coaxially slidably embedded in the sliding cavity 18, and the outer wall of the sliding seat 72 fits the cavity wall of the sliding cavity 18. A guide column 722 is fixedly connected to the surface of the sliding seat 72 on one side close to the liquid outlet channel 12. There are a plurality of guide columns 722, and the plurality of guide columns 722 are divided into two groups. The two groups of guide columns 722 are symmetrically distributed along the length direction perpendicular to the middle beam 13, and the plurality of guide columns 722 in the same group are uniformly distributed around the axis of the valve body 1. In this embodiment, six guide columns 722 are provided. A second slide groove 111 is provided at the bottom of the sliding cavity 18. The number of the second slide grooves 111 is the same as the number of the guide columns 722 and corresponds one to one. The guide column 722 is slidably embedded in the second slide groove 111, and the side wall of the guide column 722 fits the groove wall of the second slide groove 111. The sixth reset member 71 is connected between the guide column 722 and the valve body 1, and the sixth reset member 71 makes the sliding seat 72 have a tendency to move away from the liquid outlet channel 12. In this embodiment, the sixth reset member 71 is a spring, one end of the sixth reset member 71 is connected to one end of the guide column 722 away from the sliding seat 72, and the other end of the sixth reset member 71 is connected to the bottom of the second slide groove 111.

[0040] Reference Figure 3 and Figure 4, a receiving groove 723 is coaxially provided at the inner wall of the sliding seat 72 away from the end of the liquid outlet channel 12, the filter screen 4 is coaxially embedded in the receiving groove 723, the outer wall of the filter screen 4 is in contact with the groove wall of the receiving groove 723, the side surface of the filter screen 4 close to the groove bottom of the installation groove 611 abuts against the groove bottom of the receiving groove 723, and the groove wall of the receiving groove 723 away from the end of the liquid outlet channel 12 is provided with a seventh chamfer 724, which is used to abut against the outer wall of the filter screen 4. A limiting groove 721 is provided at the groove bottom of the receiving groove 723, and the number of the limiting grooves 721 is the same as the number of the fixed grooves 411 and corresponds one to one. The side surface of the filter screen 4 close to the liquid outlet channel 12 is fixedly connected to the limiting block 42, and the number of the limiting blocks 42 is the same as the number of the limiting grooves 721 and corresponds one to one. The limiting block 42 is embedded in the limiting groove 721, and the side wall of the limiting block 42 is in contact with the groove wall of the limiting groove 721.

[0041] Reference Figure 4 and Figure 5The cleaning mechanism 7 also includes a knocking assembly 73, and the number of the knocking assembly 73 is the same as the number of the guide posts 722 and corresponds one to one. The knocking assembly 73 includes a second rotating shaft 737, a knocking block 734, a gear 733, a rack 731 and a seventh reset member 732. A groove 14 is provided on the inner wall of the liquid inlet channel 11, and the second rotating shaft 737 is rotatably embedded in the groove 14. The rotation axis of the second rotating shaft 737 is perpendicular to the sliding direction of the guide post 722. One end of the knocking block 734 is fixedly connected to the outer periphery of the second rotating shaft 737, and the other end of the knocking block 734 is used to knock on the side surface of the guide post 722 close to the axis of the valve body 1. A groove 14 is provided with rotation grooves 112 on both sides of the rotation axis of the second rotation shaft 737, and the two ends of the second rotation shaft 737 extend into the two rotation grooves 112 respectively. The number of gears 733, racks 731 and seventh reset members 732 is the same as the number of rotation grooves 112 and corresponds to each other. The gear 733 is rotatably embedded in the rotation groove 112, and the gear 733 is coaxially fixedly connected to the outer periphery of the second rotation shaft 737. The rack 731 is slidably embedded in the rotation groove 112. The sliding direction of the rack 731 is parallel to the sliding direction of the guide column 722. The rack 731 is located on the side of the gear 733 close to the axis of the valve body 1, and the rack 731 is meshed with the gear 733. The seventh reset member 732 is connected between the rack 731 and the valve body 1, and the seventh reset member 732 makes the rack 731 have a tendency to move away from the liquid outlet channel 12. In this embodiment, the seventh reset member 732 is a spring, one end of the seventh reset member 732 is connected to one end of the rack 731 close to the liquid outlet channel 12, and the other end of the seventh reset member 732 is connected to a side wall of the rotating groove 112 close to the liquid outlet channel 12. An abutting rod 7311 is fixedly connected to one end of the rack 731 close to the sliding cavity 18, and second guide grooves 113 are respectively provided at the groove walls on both sides of the second sliding groove 111 along the rotation axis of the second rotating shaft 737, and the second guide groove 113 is connected to the rotating groove 112. A second guide block 725 is fixedly connected to the side wall of the guide column 722, and the second guide block 725 is slidably embedded in the second guide groove 113, and the second guide block 725 abuts against a side surface of the abutting rod 7311 close to the sliding cavity 18.

[0042] The knocking assembly 73 also includes a protrusion 738, a positioning block 735 and an eighth reset member 736. The valve body 1 is provided with a connecting groove 114, which is connected to the two rotating grooves 112. The protrusion 738 is fixedly connected to one end of the two racks 731 close to the liquid outlet channel 12. The protrusion 738 is slidably embedded in the connecting groove 114. The side of the protrusion 738 close to the axis of the valve body 1 is provided with a fifth slide groove 7381. The positioning block 735 is slidably embedded in the fifth slide groove 7381. The sliding direction of the positioning block 735 is perpendicular to the sliding direction of the protrusion 738. A positioning groove 15 is provided at the groove wall on one side of the connecting groove 114 close to the axis of the valve body 1. The positioning groove 15 is connected to the liquid outlet channel 12, and the positioning groove 15 is used for the positioning block 735 to be embedded. The eighth reset member 736 is connected between the positioning block 735 and the protrusion 738. The eighth reset member 736 makes the positioning block 735 have a tendency to be embedded in the positioning groove 15. In this embodiment, the eighth reset member 736 adopts a spring, one end of the eighth reset member 736 is connected to one end of the positioning block 735 close to the bottom of the fifth slide groove 7381, and the other end of the eighth reset member 736 is connected to the bottom of the fifth slide groove 7381. Three eighth reset members 736 are provided, and the three eighth reset members 736 are evenly distributed along the length direction of the positioning block 735.

[0043] The cleaning mechanism 7 also includes an unlocking assembly 74, and the number of the unlocking assembly 74 is the same as the number of the positioning grooves 15 and corresponds one to one. The unlocking assembly 74 includes an abutting block 741 and a ninth reset member 742. The abutting block 741 is slidably embedded in the positioning groove 15. The sliding direction of the abutting block 741 is parallel to the sliding direction of the protrusion 738. The surface of the side of the abutting block 741 away from the axis of the valve body 1 is flush with the groove wall of the connecting groove 114 on the side close to the axis of the valve body 1. The end of the abutting block 741 close to the liquid outlet channel 12 is used to abut the valve disc 2, and the other end of the abutting block 741 is used to abut the positioning block 735. The end of the positioning block 735 away from the bottom of the fifth slide groove 7381 is provided with a second chamfer 7351. The second chamfer 7351 is located on the side of the positioning block 735 close to the liquid outlet channel 12. The second chamfer 7351 is used to abut the abutting block 741. A fourth guide groove 115 is provided at a groove wall on one side of the positioning groove 15 close to the axis of the valve body 1, a fourth guide block 7411 is fixedly connected to the side wall of the abutment block 741, the fourth guide block 7411 is slidably embedded in the fourth guide groove 115, and a ninth reset member 742 is connected between the fourth guide block 7411 and the valve body 1, and the ninth reset member 742 makes the abutment block 741 have a tendency to extend into the liquid outlet channel 12. In this embodiment, the ninth reset member 742 is a spring, one end of the ninth reset member 742 is connected to a side surface of the fourth guide block 7411 close to the liquid outlet channel 12, and the other end of the ninth reset member 742 is connected to a side groove wall of the fourth guide groove 115 close to the liquid outlet channel 12, and three ninth reset members 742 are provided, and the three ninth positioning members are evenly distributed along the length direction of the fourth guide block 7411.

[0044] The implementation principle of an improved double-flap check valve in an embodiment of the present application is as follows: when installing the filter 4, the installation sleeve 41 is embedded in the installation groove 611, and the unlocking column 64 is pressed so that the fixing block 62 is embedded in the third sliding groove 614, the installation sleeve 41 abuts against the bottom of the installation groove 611, the filter 4 abuts against the bottom of the accommodating groove 723, and the limit block 42 is embedded in the limit groove 721.

[0045] The unlocking column 64 is released, and the first chamfer 6411 abuts against the fixing block 62 , pushing the fixing block 62 to be embedded in the fixing groove 411 , thereby achieving relative fixation of the connecting column 61 and the mounting sleeve 41 .

[0046] When in use, water flows in from one side of the liquid inlet channel 11, and the water flows impact the valve disc 2, driving the valve disc 2 to rotate, the second reset member 54 drives the sealing strip 53 to slide and abut against the valve disc 2, driving the connecting column 61 to slide, the first fillet 661 abuts against the groove wall of the embedding groove 133, the locking column 66 overcomes the elastic force of the fifth reset member 67 to slide, the sixth chamfer 662 abuts against the groove wall of the locking groove 6412, and the locking column 66 is embedded in the locking groove 6412, so that the connecting column 61 and the unlocking column 64 are relatively fixed. The filter screen 4 is driven to slide, the sliding seat 72 is driven to slide, the second guide block 725 is driven to slide, the abutting rod 7311 is driven to slide, the rack 731 is driven to slide, the gear 733 is driven to rotate, and the end of the knocking block 734 away from the second rotating shaft 737 is driven to rotate and be embedded in the groove 14. The eighth reset member 736 drives the positioning block 735 to be embedded in the positioning groove 15, and the positioning block 735 abuts against the groove wall of the positioning groove 15, so that the rack 731 and the valve body 1 are relatively fixed.

[0047] After the water flow on one side of the liquid inlet channel 11 stops, the torsion spring 3 drives the valve flap 2 to abut against the abutment ring 17 and the middle beam 13, the valve flap 2 abuts against the fourth chamfer 531, the sealing strip 53 overcomes the elastic force of the second reset member 54 to slide, drives the connecting column 61 to slide, and the sixth driving member drives the sliding seat 72 away from the liquid outlet channel 12, driving the filter screen 4 to slide. The first slide groove 613 is aligned with the embedded groove 133, and the fifth reset member 67 drives the locking column 66 to slide the elastic locking groove 6412 and then embed into the embedded groove 133. The valve flap 2 abuts against the abutment block 741, and the abutment block 741 abuts against the second chamfer 7351, pushing the positioning block 735 to overcome the elastic force of the eighth reset member 736 and embed into the fifth slide groove 7381. The seventh reset member 732 pushes the gear 733 to slide away from the liquid outlet channel 12, drives the gear 733 to rotate, drives the knocking block 734 to rotate, and the knocking block 734 knocks the guide column 722 to knock off the impurities on the filter screen 4.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An improved double-flap check valve, characterized in that: The invention comprises a valve body (1), a valve flap (2), a torsion spring (3) and a filter screen (4); the two ends of the valve body (1) are respectively provided with a liquid inlet channel (11) and a liquid outlet channel (12); the liquid inlet channel (11) and the liquid outlet channel (12) are connected; the diameter of the liquid inlet channel (11) is smaller than the diameter of the liquid outlet channel (12); a middle beam (13) is connected to the inner wall of the liquid inlet channel (11); the valve flap (2) is rotatably embedded in the liquid outlet channel (12); the rotation axis of the valve flap (2) is parallel to the length direction of the middle beam (13); two valve flaps (2) are provided; the two valve flaps (2) are symmetrically distributed along a direction perpendicular to the length direction of the middle beam (13); the torsion spring (3) is connected between the two valve flaps (2); the torsion spring (3) enables the valve flap (2) to have an inner wall that presses against the liquid outlet channel (12) on the side close to the liquid inlet channel (11); and the filter screen (4) is embedded in the liquid inlet channel (11).

2. The improved double-flap check valve according to claim 1, characterized in that: The valve disc (2) further comprises a sealing ring (51), a first reset member (52), a sealing strip (53) and a second reset member (54); a first sealing groove (21) is provided on a side of the valve disc (2) close to the liquid inlet channel (11); the first sealing groove (21) extends along the circumference of the valve disc (2); the number of the sealing rings (51) is the same as the number of the first sealing grooves (21) and they correspond one to one; the sealing ring (51) is slidably embedded in the first sealing groove (21); the sliding direction of the sealing ring (51) is parallel to the thickness direction of the valve disc (2); the sealing ring (51) is used to press against the inner wall of the liquid outlet channel (12) close to the liquid inlet channel (11); the first reset member (52) is connected to the valve disc (2) between the sealing ring (51) and the valve flap (2); the first reset member (52) enables the sealing ring (51) to have a tendency to extend out of the first sealing groove (21); a second sealing groove (131) is provided on a side of the middle beam (13) close to the liquid outlet channel (12); the sealing strip (53) is slidably embedded in the second sealing groove (131); the sliding direction of the sealing strip (53) is parallel to the axial direction of the liquid outlet channel (12); the sealing strip (53) is used to abut against the valve flap (2); the second reset member (54) is connected between the sealing strip (53) and the middle beam (13); the second reset member (54) enables the sealing strip (53) to have a tendency to abut against the valve flap (2).

3. The improved double-flap check valve according to claim 2, characterized in that: It also comprises a connecting column (61) and a fixing block (62); a connecting hole (132) is provided at the bottom of the second sealing groove (131); the fixing hole (132) is connected to the liquid inlet channel (11); one end of the connecting column (61) is connected to the sealing strip (53); the other end of the connecting column (61) passes through the connecting hole (132) and extends into the liquid inlet channel (11); the filter screen (4) is coaxially connected to a mounting sleeve (41); the mounting sleeve (41) is coaxially slidably connected to an end of the connecting column (61) away from the sealing strip (53); the fixing block (62) is slidably connected to the connecting column (61); the sliding direction of the fixing block (62) is perpendicular to the axial direction of the connecting column (61); a fixing groove (411) is provided on the inner wall of the mounting sleeve (41); the fixing groove (411) is used for the fixing block (62) to be embedded.

4. The improved double-flap check valve according to claim 3 is characterized in that: An installation groove (611) is provided on the outer periphery of one end of the connecting column (61) away from the sealing strip (53); the groove wall of the installation groove (611) fits the inner wall of the installation sleeve (41); and the groove bottom of the installation groove (611) abuts against one end of the installation sleeve (41) close to the liquid outlet channel (12).

5. The improved double-flap check valve according to claim 3 is characterized in that: The invention also comprises a third restoring member (63), an unlocking column (64) and a fourth restoring member (65); an unlocking groove (612) is provided at one end of the connecting column (61) away from the sealing strip (53); the unlocking column (64) is slidably embedded in the unlocking groove (612); the sliding direction of the unlocking column (64) is parallel to the axial direction of the connecting column (61); the fourth restoring member (65) is connected between the unlocking column (64) and the connecting column (61); the fourth restoring member (65) enables the unlocking column (64) to move away from the sealing strip (53); The third reset member (63) has a tendency to extend out of the unlocking groove (612); the third reset member (63) is connected between the fixed block (62) and the connecting column (61); the third reset member (63) causes the fixed block (62) to have a tendency to abut against the outer wall of the unlocking column (64); a convex ring (641) is connected to the outer periphery of the unlocking column (64); a first chamfer (6411) is provided on the outer periphery of the convex ring (641) away from the sealing strip (53); and the first chamfer (6411) is used to abut against the fixed block (62).

6. The improved double-flap check valve according to claim 5, characterized in that: The connecting column (61) further comprises a locking column (66) and a fifth restoration member (67); the connecting column (61) is provided with a first sliding groove (613); the first sliding groove (613) is connected to the connecting hole (132) and the unlocking groove (612); the locking column (66) is slidably embedded in the first sliding groove (613); the sliding direction of the locking column (66) is perpendicular to the axial direction of the connecting column (61); the fifth restoration member (67) is connected between the locking column (66) and the connecting column (61); the fifth restoration member (67) enables the locking column (66) to move away from the unlocking groove (612) The end of the connecting hole (132) has a tendency to extend out of the first sliding groove (613); the wall of the connecting hole (132) is provided with an embedding groove (133); the embedding groove (133) is used for embedding the end of the locking column (66) away from the unlocking groove (612); the outer periphery of the end of the locking column (66) away from the unlocking groove (612) is provided with a first rounded corner (661); the first rounded corner (661) is used to abut against the groove wall of the embedding groove (133); the side wall of the unlocking column (64) is provided with a locking groove (6412); the locking groove (6412) is used for embedding the other end of the locking column (66).

7. The improved double-flap check valve according to claim 2, characterized in that: The valve body (734) further comprises a sliding seat (72), a sixth reset member (71), a rack (731), a seventh reset member (732), a gear (733) and a knocking block (734); the sliding seat (72) is coaxially slidably embedded in the liquid inlet channel (11); the filter screen (4) is connected to the sliding seat (72); the sixth reset member (71) is connected between the sliding seat (72) and the valve body (1); the sixth reset member (71) enables the sliding seat (72) to have a tendency to move away from the liquid outlet channel (12); the rack (731) is slidably connected to the valve body (1); the sliding direction of the rack (731) is parallel to the sliding direction of the sliding seat (72); the gear (733) is connected to the valve body (1 ... The rack (731) has one end away from the liquid outlet channel (12) butted against the sliding seat (72); the seventh reset member (732) is connected between the rack (731) and the valve body (1); the seventh reset member (732) causes the rack (731) to have a tendency to move away from the liquid outlet channel (12); the gear (733) is rotatably connected to the valve body (1); the rotation axis of the gear (733) is perpendicular to the axial direction of the liquid outlet channel (12); the gear (733) is meshed with the rack (731); one end of the knocking block (734) is connected to the rack (731); and the other end of the knocking block (734) is used for knocking the sliding seat (72).

8. The improved double-flap check valve according to claim 7, characterized in that: A groove (14) is provided on the inner wall of the liquid outlet channel (12); the groove (14) is used for the knocking block (734) to be embedded.

9. The improved double-flap check valve according to claim 7, characterized in that: The valve body (1) further comprises a positioning block (735), an eighth reset member (736), an abutment block (741) and a ninth reset member (742); the positioning block (735) is slidably connected to the rack (731); the sliding direction of the positioning block (735) is perpendicular to the sliding direction of the rack (731); the valve body (1) is provided with a positioning groove (15); the positioning groove (15) is used for the positioning block (735) to be embedded; the eighth reset member (736) is connected between the positioning block (735) and the rack (731); the eighth reset member (736) enables the positioning block (735) to have a tendency to be embedded in the positioning groove (15); the abutment block (741) is slidably embedded in the positioning groove (15); The sliding direction of the abutment block (741) is parallel to the sliding direction of the rack (731); one end of the abutment block (741) extends into the liquid outlet channel (12) for abutment with the valve flap (2); a second chamfer (7351) is provided at one end of the positioning block (735) away from the rack (731); the second chamfer (7351) is located on a side of the positioning block (735) close to the liquid outlet channel (12); the second chamfer (7351) is used for abutment with the abutment block (741); the ninth reset member (742) is connected between the abutment block (741) and the valve body (1); the ninth reset member (742) enables the abutment block (741) to have a tendency to extend into the liquid outlet channel (12).

10. The improved double-flap check valve according to claim 1, characterized in that: A lifting lug (16) is connected to the outer periphery of the valve body (1).

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