Swing type internal thread check valve

Abstract

The present invention discloses a swing type internal thread check valve, comprising a valve body, a valve cover, a valve cavity formed in the valve body, a valve disc installed in the valve cavity, and a valve seat provided in the valve cavity and sealed with the valve disc, the valve cover is provided with a mounting rail located in the valve cavity, a top block is slidably provided in the mounting rail, a linkage member constituting the linkage between the top block and the valve disc is provided between the top block and the valve disc, a limit block is slidably provided in the mounting rail, a control assembly for controlling the sliding of the limit block is provided on the valve cover, elastic barbs are provided on both sides of the top block and are hung on the limit block during the sliding process, and a driving member for driving the elastic barbs to disengage from the limit block during the movement process is provided on the limit block. The present invention has the following advantages and effects: the present invention can simultaneously adjust the opening of the valve disc and whether the valve disc needs to be positioned after opening only by means of a screw, and the operation is very convenient.

Description

Technical Field

[0001] The invention relates to the technical field of valve manufacturing, in particular to a swing type internal thread check valve. Background Art

[0002] Valves are often used as fluid switches in pipeline projects, and some pipeline projects require that the fluid flow in a fixed direction. A check valve is a valve that blocks the backflow of the medium by its own weight and medium pressure. It is an automatic valve. When the fluid is cut off, the check valve plate will move in the opposite direction under the action of gravity, and achieve close sealing contact with the valve seat to prevent the fluid from flowing back.

[0003] Since the check valve is qualitatively determined to be used for quick closing in most practical uses, and the valve disc and rocker arm of the swing check valve are connected by rotation, water hammer is usually generated during the medium flow process in the process of opening the swing check valve, because the flow path of the medium is relatively tortuous. When the water hammer impacts the valve disc, the valve disc and the rocker arm will cause movement. During the long-term operation of the check valve, if the water hammer continues to impact the valve disc, it is easy to cause the connection between the rocker arm and the valve disc to loosen or even detach, seriously affecting the normal use of the check valve. Since the valve disc of the check valve itself will also become a resistance, when the medium is discharged from the low-pressure area to the high-pressure area, if the impact force of the medium is lower than the back pressure of the valve disc, it is easy to cause the valve disc to open and close intermittently, thereby increasing the wear of the valve disc and the valve seat, and reducing the sealing performance and service life of the valve disc and the valve seat.

[0004] And because the existing check valves do not have the function of adjusting the opening, when the flow of the medium needs to be adjusted, the only way is to install a regulating valve on the pipeline, which not only increases the cost but also makes the operation more cumbersome. Therefore, it is necessary to design a swing check valve that is convenient for adjusting the opening of the check valve and can lock the valve disc when the check valve needs to work for a long time. Summary of the invention

[0005] The purpose of the present invention is to provide a swing type internal thread check valve which can adjust the valve flap opening and whether to lock the valve flap.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a swing type internal threaded check valve, comprising a valve body, a valve cover, a valve cavity formed in the valve body, a valve disc installed in the valve cavity, and a valve seat arranged in the valve cavity and sealed with the valve disc, the valve cover is provided with a mounting rail located in the valve cavity, a top block is slidably provided in the mounting rail, a linkage member constituting the linkage between the top block and the valve disc is provided between the top block and the valve disc, a limit block is slidably provided in the mounting rail, a control component for controlling the sliding of the limit block is provided on the valve cover, elastic barbs are provided on both sides of the top block and are hung on the limit block during the sliding process, and a driving component for driving the elastic barbs to disengage from the limit block during the movement is provided on the limit block.

[0007] By adopting the above technical scheme, the linkage between the valve disc and the top block is formed by the linkage part, so that the valve disc controls the top block to slide in the mounting rail during the opening and closing process, and the limit block can be used to limit the movable stroke of the top block. When the valve disc opens and drives the top block to slide until it abuts against the limit block, the limit block limits the top block to continue sliding toward the limit block. At this time, the valve disc is at the maximum opening, and the position of the limit block can be adjusted by the control component to adjust the maximum opening of the valve disc. The elastic barb can be hung on the limit block when the top block slides to abut against the limit block, thereby limiting the sliding of the top block to position the valve disc. When it is necessary to detach the top block from the limit block, it is only necessary to drive the limit block to move through the control component to detach the elastic barb from the limit block. After the valve disc is positioned, it can be prevented from continuously impacting the valve body, thereby greatly increasing the service life of the valve disc and the valve, and the maximum opening size and whether the valve disc is positioned can be adjusted only by the valve stem, and the operation is very convenient.

[0008] It is further configured as follows: the linkage member comprises a push rod with one end hinged to the valve disc, and the other end of the push rod is hinged to the top block.

[0009] By adopting the above technical solution, when the valve disc is in the process of opening, the push rod pushes the top block to slide upward in the mounting rail, and when the valve disc is in the process of closing, the push rod pulls the top block to slide downward in the mounting rail.

[0010] It is further configured as follows: the control component includes a screw which is sealingly rotatably arranged on the valve cover and located in the mounting rail; the screw is connected to a hand wheel after extending out of the valve cover; and the screw is threadedly connected to the limit block.

[0011] By adopting the above technical solution, since the screw rod is threadedly connected to the limit block, and the limit block is slidably connected to the mounting rail, when the screw rod is controlled to rotate by the hand wheel, the limit block slides in the mounting rail.

[0012] It is further configured as follows: the driving component includes a cam rotatably arranged on the limit block and moving with the limit block, and a linkage assembly arranged between the cam and the mounting rail for controlling the rotation of the cam, the rotation of the cam includes a driving stroke and an invalid stroke, and the cam switches between the driving stroke and the invalid stroke, wherein the driving stroke is used to drive the elastic barb to expand and disengage the elastic barb from the limit block.

[0013] By adopting the above technical scheme, since the limit block and the mounting rail are slidingly connected, and the cam is arranged on the limit block and the linkage component for controlling the rotation of the cam is arranged between the cam and the mounting rail, when the limit block is controlled to slide by the screw rod, the linkage component controls the cam to rotate on the limit block. Since the rotation of the cam includes a driving stroke and an invalid stroke, when the cam rotates into the driving stroke, the cam drives the elastic hook to open and make the elastic hook separate from the limit block. By adopting the above arrangement, when the limit block is controlled to move by the screw rod so that the cam is in the invalid stroke, the elastic hook can be hung on the limit block, thereby fixing the valve disc at the maximum opening. At this time, the limit block plays a role in adjusting the opening and fixing the valve disc. When the limit block is controlled to move by the screw rod so that the cam is in the driving stroke, the cam will open the elastic hook so that it cannot be hung on the limit block. At this time, the limit block only plays a role in adjusting the maximum opening of the valve disc, and the valve disc has a check function.

[0014] It is further configured that: the linkage assembly includes a guide groove formed on the mounting rail and a driving rod arranged on the cam, located in the guide groove and cooperating with the guide groove to form a rotation of the cam.

[0015] By adopting the above technical solution, when the screw controls the limit block to slide and drives the driving rod to move in the guide groove, the guide groove guides the cam to rotate.

[0016] It is further configured that: the guide groove is in a wave shape extending along the axial direction of the screw, and the guide groove guides the cam to switch back and forth between the driving stroke and the invalid stroke.

[0017] By adopting the above technical solution and the wave-shaped arrangement, when the driving rod moves in the guide groove, the guide groove guides the protrusion to reciprocate, so that the cam switches back and forth between the driving stroke and the invalid stroke.

[0018] It is further configured to include a slot formed on one side of the mounting rail for the push rod to pass through during the opening and closing process of the valve disc.

[0019] By adopting the above technical solution, the groove can allow the push rod to enter during the opening process of the valve disc, thereby preventing the push rod from hitting the mounting rail.

[0020] It is further configured as follows: a filter tube is connected to one side of the valve body, a filter net is arranged inside the filter tube, the other end of the filter tube is connected to a telescopic tube through a nut, the other end of the telescopic tube is sealingly and slidably connected to a docking tube, and a slide groove for the telescopic tube to enter is opened in the docking tube.

[0021] By adopting the above technical solution, impurities in the medium can be filtered through the filter screen to prevent direct erosion of the valve seat and valve disc, which would reduce the sealing performance. For the telescopic tube connected by the nut, when the filter screen needs to be replaced, it is only necessary to unscrew the nut and retract the telescopic tube into the slide groove. The operation is very convenient and it is easy to clean the filter pipe.

[0022] It is further configured as follows: a plurality of sealing rings are provided between the telescopic tube and the butt-joint tube.

[0023] By adopting the above technical solution, the sealing performance between the telescopic pipe and the butt pipe is increased to prevent leakage of the medium.

[0024] In summary, the present invention has the following beneficial effects: the opening of the valve flap and whether the valve flap needs to be positioned after opening can be adjusted simultaneously by only using a screw, and the operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a valve closed state of an embodiment;

[0026] Figure 2 A schematic diagram of a valve opening state of an embodiment;

[0027] Figure 3 for Figure 2 Middle CC section view;

[0028] Figure 4 for Figure 1 Enlarged view of part A in the middle;

[0029] Figure 5 A schematic diagram of the internal structure docking of the movable rail of the embodiment;

[0030] Figure 6 It is an exploded schematic diagram of the internal structure of the movable rail of the embodiment.

[0031] In the figure: 1. valve body; 2. valve cover; 3. valve chamber; 4. valve disc; 5. valve seat; 6. mounting rail; 7. top block; 8. push rod; 9. limit block; 10. elastic barb; 11. screw; 12. hand wheel; 13. cam; 14. guide groove; 15. drive rod; 16. slot; 17. filter tube; 18. filter screen; 19. telescopic tube; 20. butt tube; 21. slide groove; 22. sealing ring. DETAILED DESCRIPTION

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

[0033] refer to Figures 1 to 6 , a swing type internal thread check valve, comprising a valve body 1, a valve cover 2, a valve cavity 3 formed in the valve body 1, a valve disc 4 installed in the valve cavity 3 and a valve seat 5 arranged in the valve cavity 3 and sealed with the valve disc 4, a mounting rail 6 located in the valve cavity 3 is provided on the valve cover 2, a top block 7 is slidably provided in the mounting rail 6, a linkage member constituting a linkage between the top block 7 and the valve disc 4 is provided, the linkage member comprises a push rod 8 hinged on the valve disc 4 at one end, the other end of the push rod 8 is hinged to the top block 7, and also comprises a slot 16 formed on one side of the mounting rail 6 for the push rod 8 to pass through during the opening and closing process of the valve disc 4, a limit block 9 is slidably provided in the mounting rail 6, a control component for controlling the sliding of the limit block 9 is provided on the valve cover 2, elastic barbs 10 are provided on both sides of the top block 7 and are hung on the limit block 9 during the sliding process, and a driving component for driving the elastic barb 10 to disengage from the limit block 9 during the movement is provided on the limit block 9.

[0034] The control component includes a screw 11 which is sealingly rotatably arranged on the valve cover 2 and located in the mounting rail 6. The screw 11 is connected to a handwheel 12 after extending out of the valve cover 2. The screw 11 is threadedly connected to the limit block 9. The driving component includes a cam 13 which is rotatably arranged on the limit block 9 and moves with the limit block 9, and a linkage component which is arranged between the cam 13 and the mounting rail 6 and is used to control the rotation of the cam 13. The linkage component includes a guide groove 14 formed on the mounting rail 6 and a drive rod 15 which is arranged on the cam 13 and is located in the guide groove 14 and cooperates with the guide groove 14 to form the rotation of the cam 13. The rotation of the cam 13 includes a driving stroke and an invalid stroke. The cam 13 switches between the driving stroke and the invalid stroke, wherein the driving stroke is used to drive the elastic barb 10 to open so that the elastic barb 10 is separated from the limit block 9. The guide groove 14 is wavy in shape extending along the axial direction of the screw 11, and the guide groove 14 guides the cam 13 to switch back and forth between the driving stroke and the invalid stroke.

[0035] A filter tube 17 is connected to one side of the valve body 1, and a filter screen 18 is arranged inside the filter tube 17. The other end of the filter tube 17 is connected to a telescopic tube 19 through a nut. The other end of the telescopic tube 19 is sealed and slidably connected to a docking tube 20. A slide groove 21 for the telescopic tube 19 to enter is opened in the docking tube 20, and a plurality of sealing rings 22 are arranged between the telescopic tube 19 and the docking tube 20.

[0036] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A swing type internal thread check valve, comprising a valve body (1), a valve cover (2), a valve cavity (3) formed in the valve body (1), a valve flap (4) installed in the valve cavity (3), and a valve seat (5) provided in the valve cavity (3) and cooperating with the valve flap (4) to seal, characterized in that: The valve cover (2) is provided with a mounting rail (6) located in the valve cavity (3), a top block (7) is slidably provided in the mounting rail (6), a linkage member constituting a linkage between the top block (7) and the valve flap (4), a limit block (9) is slidably provided in the mounting rail (6), a control component for controlling the sliding of the limit block (9) is provided on the valve cover (2), elastic barbs (10) are provided on both sides of the top block (7) and are hung on the limit block (9) during the sliding process, and a driving component for driving the elastic barbs (10) to separate from the limit block (9) during the movement process is provided on the limit block (9).

2. The swing type internal thread check valve according to claim 1, characterized in that: The linkage member comprises a push rod (8) with one end hinged to the valve flap (4), and the other end of the push rod (8) is hinged to the top block (7).

3. The swing type internal thread check valve according to claim 1, characterized in that: The control assembly comprises a screw (11) which is sealingly rotatably arranged on the valve cover (2) and located in the mounting rail (6); the screw (11) is connected to a hand wheel (12) after extending out of the valve cover (2); and the screw (11) is threadedly connected to a limit block (9).

4. The swing type internal thread check valve according to claim 3, characterized in that: The driving component comprises a cam (13) rotatably arranged on the limit block (9) and moving with the limit block (9), and a linkage assembly arranged between the cam (13) and the mounting rail (6) for controlling the rotation of the cam (13), wherein the rotation of the cam (13) comprises a driving stroke and an invalid stroke, and the cam (13) switches between the driving stroke and the invalid stroke, wherein the driving stroke is used to drive the elastic barb (10) to open so that the elastic barb (10) is separated from the limit block (9).

5. The swing type internal thread check valve according to claim 4, characterized in that: The linkage assembly comprises a guide groove (14) formed on the mounting rail (6) and a driving rod (15) disposed on the cam (13) and located in the guide groove (14) and cooperating with the guide groove (14) to cause the cam (13) to rotate.

6. The swing type internal thread check valve according to claim 5, characterized in that: The guide groove (14) is wavy and extends in the axial direction of the screw rod (11). The guide groove (14) guides the cam (13) to switch back and forth between the driving stroke and the invalid stroke.

7. The swing type internal thread check valve according to claim 1, characterized in that: It comprises a slot (16) formed on one side of the mounting rail (6) for the push rod (8) to pass through during the opening and closing process of the valve flap (4).

8. The swing type internal thread check valve according to claim 1, characterized in that: One side of the valve body (1) is connected to a filter tube (17), a filter screen (18) is arranged inside the filter tube (17), the other end of the filter tube (17) is connected to a telescopic tube (19) via a nut, the other end of the telescopic tube (19) is sealed and slidably connected to a butt joint tube (20), and a slide groove (21) is provided inside the butt joint tube (20) for the telescopic tube (19) to enter.

9. The swing type internal thread check valve according to claim 8, characterized in that: A plurality of sealing rings (22) are provided between the telescopic tube (19) and the butt-joint tube (20).

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