Backflow prevention check valve with filtering device

Abstract

The utility model relates to the technical field of check valves, in particular to an anti-backflow check valve with a filtering device, which comprises a valve body, a valve core mechanism, a mounting frame and a filtering mechanism, the valve element mechanism is detachably arranged in the valve body and used for preventing liquid in a pipeline from flowing back. The mounting frame is arranged on the water inlet side of the valve body and communicates with an inlet of the valve body, and an access hole is formed in the upper half part of the mounting frame; the filtering mechanism is arranged in the mounting frame, one end of the filtering mechanism is slidably connected with the mounting frame, and the other end of the filtering mechanism penetrates through the mounting frame and extends out of the mounting frame. Due to the arrangement of the filter mechanism, when the filter screen needs to be cleaned or replaced, only the adjusting screw needs to be rotated to enable the movable frame and the filter screen to move to the access hole, and a liquid path connected with the check valve does not need to be disconnected and isolated, so that the replacement steps of the filter screen are greatly simplified, more time and labor are saved, and the replacement efficiency of the filter element is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to an anti-backflow check valve with a filtering device. Background Art

[0002] A check valve is a valve whose opening and closing parts are circular discs and which rely on their own weight and medium pressure to produce movement to block the backflow of the medium. It belongs to the category of automatic valves, also known as non-return valves, one-way valves, reflux valves or isolation valves. The disc movement modes are divided into lifting type and swing type. The lifting check valve is similar to the stop valve in structure, only lacking the valve stem that drives the disc. The medium enters from the inlet end (the swing check valve has a disc that is tilted and can rotate around the axis, and its working principle is similar to that of the lifting check valve. The check valve is often used as a bottom valve of a pumping device to prevent the backflow of water. The check valve is used in combination with the stop valve to play a role of safety isolation. The disadvantage is that the resistance is large and the sealing is poor when closed.

[0003] The Chinese patent with the announcement number CN208651715U discloses a backflow prevention check valve with a filtering device, including a valve body, one end of the valve body is provided with a liquid inlet cavity, the other end is provided with a liquid outlet cavity, a plugging port is provided at the connection between the liquid outlet cavity and the liquid inlet cavity, the plugging port is a circular structure, and the inner wall is provided with four fixing holes at equal distances, the valve body is provided with an installation port located just above the plugging port, the installation port is fixedly provided with a cover by a locking bolt, the cover is fixedly provided with a guide column on the side facing the inner cavity of the valve body, the guide column is provided with a telescopic groove along its length direction, the end of the telescopic groove away from the cover is provided with an opening, and a piston is movably installed in the telescopic groove through the opening. The filtering mechanism in the utility model plays a role in filtering the liquid, and is replaced and fixed as the cover is disassembled and installed, so that the method of disassembling and replacing the filter element is simple and convenient, and the replacement efficiency of the filter element is improved, which is suitable for popularization and use.

[0004] However, the above technical solution has the following shortcomings: when replacing the filter element, the valve core of the check valve needs to be removed from the valve body. During the whole process of replacing the filter element, the entire one-way valve is in an invalid state and cannot check the liquid in the pipeline behind the valve body. The entire liquid path connected to it needs to be disconnected and isolated. The preparation work is relatively cumbersome, the workload is large, and it is time-consuming and labor-intensive. Utility Model Content

[0005] The utility model aims to solve the problems existing in the background technology and proposes an anti-backflow check valve with a filtering device.

[0006] The technical solution of the utility model is: a backflow prevention check valve with a filtering device, comprising:

[0007] Valve body;

[0008] A spool mechanism, which is detachably arranged in the valve body to prevent the liquid in the pipeline from flowing back;

[0009] An installation frame, which is arranged on the water inlet side of the valve body. The installation frame is communicated with the inlet of the valve body, and a maintenance opening is provided in the upper half of the installation frame;

[0010] A filtering mechanism, which is arranged in the installation frame. One end of the filtering mechanism is slidably connected with the installation frame, and the other end of the filtering mechanism penetrates through the installation frame and extends to the outside of the installation frame.

[0011] Preferably, the spool mechanism includes a valve cover, a valve seat, a first spring and a spool; the valve cover is detachably arranged on the top of the valve body, the valve seat is fixedly arranged inside the valve body, the first spring and the spool are both arranged inside the valve body, one end of the first spring is connected with the valve cover, the other end of the first spring is connected with the spool, and the spool fits with the valve seat under the action of the first spring.

[0012] Preferably, the filtering mechanism includes a movable frame, a movable plate, an adjusting screw and a filter screen; the movable frame and the movable plate are both slidably arranged in the installation frame, the top of the movable frame is fixedly connected with the movable plate, one end of the adjusting screw is rotatably connected with the movable plate, the other end of the adjusting screw penetrates through the installation frame and is threadedly connected with the installation frame, the filter screen is detachably arranged in the movable frame, and the filter screen is connected with the movable frame through a clamping component.

[0013] Preferably, a stepped groove is arranged in the installation frame, the movable plate is slidably connected with the upper half of the stepped groove, and a sealing gasket adapted to the stepped groove is arranged at the bottom of the movable plate.

[0014] Preferably, a limiting frame is fixedly connected to one side of the inner wall of the movable frame, and a guiding groove is arranged on the inner wall of the movable frame.

[0015] Preferably, the clamping component includes an installation plate, a clamping rod, a limiting plate and a limiting ring; the installation plate and the limiting plate are both fixedly connected with the filter screen, the clamping rod penetrates through the installation plate and the limiting plate and is slidably connected with the installation plate and the limiting plate, a clamping groove adapted to the clamping rod is arranged on the inner wall of the movable frame, and the limiting ring is located between the installation plate and the limiting plate and is fixedly connected with the clamping rod.

[0016] Preferably, it further includes a return spring, one end of the return spring is connected with the limiting ring, and the other end of the return spring is connected with the installation plate.

[0017] Compared with the prior art, the above technical solution of the present utility model has the following beneficial technical effects:

[0018] With the provision of the filtering mechanism in the present utility model, when it is necessary to clean or replace the filter screen, only need to rotate the adjusting screw rod to move the movable frame and the filter screen to the maintenance opening, then the filter screen can be cleaned or replaced. At this time, the movable frame can also cooperate with the installation frame to achieve a temporary sealing effect, without disconnecting and isolating the liquid path connected to the check valve, greatly simplifying the replacement steps of the filter screen, saving more time and effort, and improving the replacement efficiency of the filter element. Brief Description of the Drawings

[0019] Figure 1 It is a perspective view of an embodiment proposed by the present utility model;

[0020] Figure 2 It is a cross-sectional view of the spool mechanism in an embodiment proposed by the present utility model;

[0021] Figure 3 It is a perspective view of the filtering mechanism in an embodiment proposed by the present utility model;

[0022] Figure 4 It is a cross-sectional view of the installation frame in an embodiment proposed by the present utility model;

[0023] Figure 5 It is a perspective view of the movable frame in an embodiment proposed by the present utility model;

[0024] Figure 6 For the present utility model Figure 5 Local enlarged view of part A;

[0025] Figure 7 It is a cross-sectional view of the movable frame in an embodiment proposed by the present utility model.

[0026] Reference numerals: 1, valve body; 2, spool mechanism; 21, valve cover; 22, valve seat; 23, first spring; 24, spool; 3, installation frame; 4, filtering mechanism; 41, movable frame; 42, movable plate; 43, adjusting screw rod; 44, clamping assembly; 441, mounting plate; 442, clamping rod; 443, limiting plate; 444, limiting ring; 445, clamping groove; 446, return spring; 45, filter screen; 46, limiting frame; 47, guiding groove; 5, maintenance opening; 6, stepped groove; 7, sealing gasket. Detailed Description of the Embodiment

[0027] Embodiment 1

[0028] As Figure 1-7 shown, a backflow prevention check valve with a filtering device proposed by the present utility model includes a valve body 1, a spool mechanism 2, an installation frame 3 and a filtering mechanism 4;

[0029] The spool mechanism 2 is detachably arranged in the valve body 1 to prevent the liquid in the pipeline from flowing back;

[0030] The mounting frame 3 is arranged on the water inlet side of the valve body 1. The mounting frame 3 is communicated with the inlet of the valve body 1. A maintenance opening 5 is provided in the upper half of the mounting frame 3.

[0031] The filtering mechanism 4 is arranged in the mounting frame 3. One end of the filtering mechanism 4 is slidably connected to the mounting frame 3, and the other end of the filtering mechanism 4 penetrates through the mounting frame 3 and extends to the outside of the mounting frame 3.

[0032] Embodiment Two

[0033] As Figure 1-2 shown, a backflow-preventing check valve with a filtering device proposed by the present utility model further specifically discloses the structure of the valve core mechanism 2 compared with Embodiment One. The valve core mechanism 2 includes a valve cover 21, a valve seat 22, a first spring 23 and a valve core 24. The valve cover 21 is detachably arranged on the top of the valve body 1 through connecting bolts. The valve seat 22 is fixedly arranged inside the valve body 1. The first spring 23 and the valve core 24 are both arranged inside the valve body 1. One end of the first spring 23 is connected to the valve cover 21, and the other end of the first spring 23 is connected to the valve core 24. The valve core 24 is attached to the valve seat 22 under the action of the first spring 23.

[0034] Embodiment Three

[0035] As Figure 1-7 shown, a backflow-preventing check valve with a filtering device proposed by the present utility model further specifically discloses the structure of the filtering mechanism 4 compared with Embodiment Two. The filtering mechanism 4 includes a movable frame 41, a movable plate 42, an adjusting screw 43 and a filter net 45. The movable frame 41 and the movable plate 42 are both slidably arranged in the mounting frame 3. The top of the movable frame 41 is fixedly connected to the movable plate 42. One end of the adjusting screw 43 is rotatably connected to the movable plate 42, and the other end of the adjusting screw 43 penetrates through the mounting frame 3 and is threadedly connected to the mounting frame 3. The filter net 45 is detachably arranged in the movable frame 41. The filter net 45 is connected to the movable frame 41 through a clamping assembly 44. A stepped groove 6 is arranged in the mounting frame 3. The movable plate 42 is slidably connected to the upper half of the stepped groove 6. A sealing gasket 7 adapted to the stepped groove 6 is arranged at the bottom of the movable plate 42. One side of the inner wall of the movable frame 41 is fixedly connected to a limiting frame 46, and a guiding groove 47 is arranged in the inner wall of the movable frame 41.

[0036] Embodiment Four

[0037] As Figure 5-6As shown, a backflow prevention check valve with a filtering device proposed by the present utility model specifically discloses the structure of the clamping component 44 compared with the third embodiment; the clamping component 44 includes a mounting plate 441, a clamping rod 442, a limiting plate 443 and a limiting ring 444; both the mounting plate 441 and the limiting plate 443 are fixedly connected to the filter net 45, the clamping rod 442 penetrates through the mounting plate 441 and the limiting plate 443 and is slidably connected to the mounting plate 441 and the limiting plate 443, a clamping groove 445 adapted to the clamping rod 442 is formed in the inner wall of the movable frame 41, the limiting ring 444 is located between the mounting plate 441 and the limiting plate 443 and is fixedly connected to the clamping rod 442, and a return spring 446 is further included. One end of the return spring 446 is connected to the limiting ring 444, and the other end of the return spring 446 is connected to the mounting plate 441.

[0038] When it is necessary to clean or replace the filter net 45, rotate the adjusting screw 43 to drive the movable frame 41 and the filter net 45 to slide upward along the inner wall of the mounting frame 3 through the movable plate 42 so that the movable frame 41 and the filter net 45 move to the inspection port 5. Pull the clamping rod 442 to make the clamping rod 442 slide out of the clamping groove 445, and then take out the filter net 45 from the movable frame 41 for cleaning or replacement. When installing the filter net 45, first insert the lower half of the filter net 45 into the movable frame 41 through the guide groove 47, and then rotate the filter net 45 so that the clamping rod 442 is inserted into the clamping groove 445 under the action of the return spring 446 to limit the filter net 45. Rotate the adjusting screw 43 to push the movable plate 42 and the movable frame 41 to reset, and the movable plate 42 pushes the sealing gasket 7 to form a seal with the stepped groove 6.

[0039] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Various changes can be made without departing from the gist of the present utility model within the knowledge scope of those skilled in the art to which it pertains.

Claims

1. A backflow prevention check valve with a filtering device, characterized in that, Comprising: Valve body (1); A spool mechanism (2), which is detachably arranged inside the valve body (1) to prevent the liquid in the pipeline from flowing back; An installation frame (3), which is arranged on the water inlet side of the valve body (1), the installation frame (3) is communicated with the inlet of the valve body (1), and a maintenance opening (5) is provided in the upper half of the installation frame (3); A filtering mechanism (4), which is arranged inside the installation frame (3), one end of the filtering mechanism (4) is slidably connected to the installation frame (3), and the other end of the filtering mechanism (4) penetrates through the installation frame (3) and extends to the outside of the installation frame (3).

2. The anti-backflow check valve with a filtering device according to claim 1, characterized in that, The spool mechanism (2) includes a valve cover (21), a valve seat (22), a first spring (23) and a spool (24); the valve cover (21) is detachably arranged on the top of the valve body (1), the valve seat (22) is fixedly arranged inside the valve body (1), both the first spring (23) and the spool (24) are arranged inside the valve body (1), one end of the first spring (23) is connected to the valve cover (21), the other end of the first spring (23) is connected to the spool (24), and the spool (24) fits with the valve seat (22) under the action of the first spring (23).

3. The anti-backflow check valve with a filtering device according to claim 1, characterized in that, The filtering mechanism (4) includes a movable frame (41), a movable plate (42), an adjusting screw (43) and a filter net (45); both the movable frame (41) and the movable plate (42) are slidably arranged inside the installation frame (3), the top of the movable frame (41) is fixedly connected to the movable plate (42), one end of the adjusting screw (43) is rotatably connected to the movable plate (42), the other end of the adjusting screw (43) penetrates through the installation frame (3) and is threadedly connected to the installation frame (3), the filter net (45) is detachably arranged inside the movable frame (41), and the filter net (45) is connected to the movable frame (41) through a clamping component (44).

4. The anti-backflow check valve with a filtering device according to claim 3, characterized in that, A stepped groove (6) is arranged inside the installation frame (3), the movable plate (42) is slidably connected to the upper half of the stepped groove (6), and a sealing washer (7) adapted to the stepped groove (6) is arranged at the bottom of the movable plate (42).

5. The anti-backflow check valve with a filtering device according to claim 3, characterized in that, One side of the inner wall of the movable frame (41) is fixedly connected with a limiting frame (46), and a guiding groove (47) is arranged on the inner wall of the movable frame (41).

6. The anti-backflow check valve with a filtering device according to claim 3, characterized in that, The clamping component (44) includes a mounting plate (441), a clamping rod (442), a limiting plate (443) and a limiting ring (444); both the mounting plate (441) and the limiting plate (443) are fixedly connected to the filter net (45), the clamping rod (442) penetrates through the mounting plate (441) and the limiting plate (443) and is slidably connected to the mounting plate (441) and the limiting plate (443), a clamping groove (445) adapted to the clamping rod (442) is arranged on the inner wall of the movable frame (41), and the limiting ring (444) is located between the mounting plate (441) and the limiting plate (443) and is fixedly connected to the clamping rod (442).

7. The anti-backflow check valve with a filtering device according to claim 6, characterized in that, It further includes a return spring (446), one end of the return spring (446) is connected to the limiting ring (444), and the other end of the return spring (446) is connected to the mounting plate (441).

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