High-precision pneumatic check valve

Abstract

The invention relates to the technical field of check valves, and particularly discloses a high-precision pneumatic check valve which comprises a metal valve shell, mounting flanges are fixedly mounted on the left side and the right side of the valve shell, an access cover plate is fixedly mounted at the upper end of the valve shell through bolts, and an internal partition plate is fixedly mounted in the middle of the interior of the valve shell. A communicating hole is formed in the middle of the inner partition plate, and a sealing plug is arranged over the communicating hole. According to the high-precision pneumatic check valve, the novel structural design is adopted, when the pressure on the left side in the valve shell is reduced, the sealing plug is pushed to move downwards under the elastic acting force of reset elastic force, the purpose of automatic sealing and check is achieved, at the moment, the pressure sensor can also detect that the pressure is reduced, and therefore the control air pump is controlled to be started; the air pump is controlled to assist in pushing the sealing plug to move downwards, the action speed of the sealing plug is increased, and the situation that the control accuracy of the valve is affected due to slow action under the elastic action is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, in particular to a high-precision pneumatic check valve. Background Art

[0002] A check valve is a valve used to prevent the backflow of media. It is usually installed in a piping system to ensure that the media can only flow in one direction. When the fluid flows, the check valve will automatically open; when the fluid flows in the opposite direction, the check valve will close, thus preventing the media from flowing back. Existing check valves generally use the elasticity of a spring or the weight of the valve disc itself to achieve automatic closing, but the closing of the valve disc by its own power may be delayed (ie, the automatic closing action is slow and cannot achieve better accuracy).

[0003] To solve the above problems, a Chinese patent with publication number CN204226752U in the prior art discloses a pneumatic check valve, including a valve body, a medium inlet and a medium outlet are formed on the valve body, a valve disc is arranged in the valve body, and the valve disc is arranged between the medium inlet and the medium outlet, and also includes a cylinder arranged on the upper part of the valve body, a guide plate is connected to the lower end of the cylinder, a valve stem is connected to the lower end of the guide plate, and the valve stem directly or indirectly contacts the valve disc, a piston assembly is arranged in the cylinder, the piston assembly includes a piston and a piston rod connected to the piston, a spring is arranged on the piston rod, an air source processing triplet is arranged at the air inlet end of the cylinder, and an electromagnetic reversing valve is externally connected to the air source processing triplet, when the system fails, the valve disc can be closed first under its own gravity, further, the air source in the cylinder pushes the piston rod, the piston rod pushes the valve stem downward through the guide plate, and the valve stem pushes the valve disc to assist the valve disc to close more quickly, thereby preventing the circulation of the medium, and having good safety benefits.

[0004] When the valve body is in a state of being ...

[0005] Combined with the above materials, it can be known that in the prior art, a cylinder is generally used to drive the valve flap, so that when the valve flap needs to be closed, its movement speed is accelerated by pneumatic means to achieve higher valve control accuracy. However, in actual use, the valve plate will affect the sealing due to wear during long-term use, thereby affecting the normal use of the device. Summary of the invention

[0006] The object of the present invention is to provide a high-precision pneumatic check valve to solve the problem in the above-mentioned background technology that the sealing performance of the valve plate is reduced and affects normal use.

[0007] To achieve the above object, the present invention provides the following technical solution: a high-precision pneumatic check valve, comprising a metal valve housing, wherein mounting flanges are fixedly mounted on the left and right sides of the valve housing, and an inspection cover is fixedly mounted on the upper end of the valve housing by bolts, and further comprising: An internal partition is fixedly installed in the middle position of the valve housing, and a communication hole is opened in the middle position of the internal partition, and a sealing plug is arranged directly above the communication hole, the sealing plug and the communication hole cooperate with each other to seal, and a piston mechanism is arranged inside the sealing plug to improve its sealing effect; A control cylinder is fixedly mounted on the upper surface of the inspection cover plate, and the movable end of the control cylinder is fixedly connected to the sealing plug, and a return spring is fixedly mounted on the upper surface of the sealing plug; A blocking plate for blocking impurities is fixedly installed at the lower end of the valve housing, the blocking plates are evenly distributed at equal intervals, and a sewage discharge mechanism cooperating with the blocking plate is provided at the lower end of the valve housing; A pressure sensor for detecting the internal pressure is fixedly installed inside the left side of the valve housing, and a flushing nozzle fixedly installed inside the valve housing is arranged outside the pressure sensor.

[0008] Preferably, the piston mechanism comprises a piston plate installed inside the piston plate, and the piston plate slides in close contact with the inner wall of the sealing plug, and a second magnet is fixedly mounted on the lower surface of the piston plate.

[0009] Preferably, the second magnet and the bottom of the sealing plug penetrate and slide with each other, and the first sealing ring and the second sealing ring are fixedly installed on the side of the sealing plug, and the first sealing ring and the second sealing ring are both set to elastic rubber material, and the first sealing ring and the second sealing ring are used to improve the sealing effect of the sealing plug, and the sealing ring with an elastic structure can expand to maintain the sealing effect.

[0010] Preferably, the first sealing ring and the second sealing ring are interconnected with the interior of the sealing plug, and the second magnet and the first magnet repel each other, and the repulsive force between the first magnet and the second magnet is used to make the second magnet expand and contract relative to the sealing plug.

[0011] Preferably, the first magnet is fixedly mounted on the upper surface of the sealing plate, and an extrusion spring is fixedly mounted between the lower surface of the sealing plate and the inner wall of the valve housing, and the side surface of the sealing plate is configured as an arc structure that fits the inner wall of the valve housing.

[0012] Preferably, the sewage discharge mechanism includes a sewage discharge pipe fixedly installed through the bottom of the valve housing, and a storage box is provided at the lower end of the sewage discharge pipe, and a threaded disassembly and installation structure is formed between the storage box and the sewage discharge pipe, and impurities in the valve enter the storage box through the sewage discharge pipe and are stored.

[0013] Preferably, a filter is fixedly installed at the upper end of the storage box, and a delivery pipe is fixedly installed on the side of the storage box, and the filter in the storage box is used to filter impurities.

[0014] Preferably, the delivery pipe and the flushing nozzle are interconnected, and a small delivery pump is fixedly installed at the bottom end of the delivery pipe. The delivery pipe is used to spray the filtered liquid from the flushing nozzle to clean the pressure sensor.

[0015] Preferably, a temporary storage box is installed on the front exterior of the valve housing, and a shunt pipe and a return pipe are threadedly installed on the left and right sides of the temporary storage box, and the shunt pipe and the return pipe are both connected to the interior of the valve housing.

[0016] Preferably, manual valves are installed outside the shunt pipe and the return pipe, an observation window made of transparent glass is installed on the front side of the temporary storage box, and a detection probe for detecting liquid components is fixedly installed above the temporary storage box.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the high-precision pneumatic check valve adopts a new structural design, the specific contents of which are as follows: 1. When the pressure on the left side of the valve housing decreases, the sealing plug is pushed downward by the elastic force of the reset spring, achieving the purpose of automatic sealing and non-return. At this time, the pressure sensor will also detect the pressure reduction, so as to control the opening of the control air pump, and use the control air pump to assist in pushing the sealing plug downward, thereby speeding up the action speed of the sealing plug and avoiding the influence of the control accuracy of the valve due to the slow action of the elastic action alone; Furthermore, when the sealing plug moves downward for sealing and check, the first magnet and the second magnet approach each other, thereby pushing the second magnet to slide relative to the sealing plug under the action of magnetic repulsion. During the sliding process, the second magnet drives the piston plate to move inside the sealing plug, and uses the piston plate to squeeze air, so that the air enters the first sealing ring and the second sealing ring, causing the first sealing ring and the second sealing ring to expand, thereby ensuring the sealing effect and avoiding the situation where the sealing performance is reduced due to friction after long-term use.

[0018] 2. During the use of the valve, the blocking plate inside the valve housing is used to block impurities in the water flow to a certain extent, so that the impurities settle at the bottom of the valve housing. The magnetic repulsion between the first magnet and the second magnet is used to push the sealing plate downward, so that the sealing plate seals the bottom of the valve housing, which is convenient for the subsequent discharge of the settled impurities; Furthermore, the discharged impurities enter the storage box through the sewage pipe for storage. At this time, the impurities are filtered by the filter net in the storage box. The filtered liquid is transported to the flushing nozzle through the delivery pipe under the action of a small delivery pump, and finally sprayed out from the flushing nozzle to re-deliver the liquid to the inside of the valve housing. At the same time, the water flow sprayed from the flushing nozzle is used to clean the surface of the pressure sensor to prevent impurities attached to the surface from affecting the monitoring accuracy of the pressure sensor.

[0019] 3. When the valve is in use, part of the liquid flows in the temporary storage box through the shunt pipe and the return pipe. The quality of the liquid is detected by the detection probe in the storage box. At the same time, the staff can observe the status of the liquid through the observation window on the front side of the storage box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the valve housing of the present invention; Figure 3 This is a schematic diagram of the control cylinder structure of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the sealing plug of the present invention; Figure 5 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 6 This is a schematic diagram of the sealing plate structure of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the piston plate of the present invention; Figure 8 This is a schematic diagram of the structure of the flushing nozzle of the present invention; Fig. 9 This is a schematic diagram of the internal structure of the storage box of the present invention; Fig.10 It is a schematic diagram of the structure of the temporary storage box of the present invention.

[0021] In the figure: 1. valve housing; 2. mounting flange; 3. inspection cover; 4. internal partition; 5. connecting hole; 6. sealing plug; 7. control cylinder; 8. reset spring; 9. blocking plate; 10. sealing plate; 11. extrusion spring; 12. first magnet; 13. second magnet; 14. piston plate; 15. first sealing ring; 16. second sealing ring; 17. pressure sensor; 18. drain pipe; 19. storage box; 20. filter screen; 21. delivery pipe; 22. small delivery pump; 23. flushing nozzle; 24. temporary storage box; 25. diverter pipe; 26. return pipe; 27. manual valve; 28. observation window; 29. ​​detection probe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figure 1-Figure 3 and Fig.10 In order to achieve the purpose of accelerating the action speed of the sealing component and improving the control accuracy, the present embodiment provides the following technical solutions, which improve the control action speed by means of pneumatic assistance, and specifically discloses: a metal valve housing 1, the left and right sides of the valve housing 1 are fixedly installed with mounting flanges 2, and the upper end of the valve housing 1 is fixedly installed with an inspection cover plate 3 by bolts, an internal partition plate 4 is fixedly installed at the middle position of the valve housing 1, and a connecting hole 5 is opened at the middle position of the internal partition plate 4, and a sealing plug 6 is arranged just above the connecting hole 5, and the sealing plug 6 and the connecting hole 5 cooperate with each other to seal, and the upper surface of the inspection cover plate 3 A control cylinder 7 is fixedly installed on the surface, and the movable end of the control cylinder 7 is fixedly connected to the sealing plug 6, and a return spring 8 is fixedly installed on the upper surface of the sealing plug 6, a temporary storage box 24 is installed on the front side of the valve housing 1, and a shunt pipe 25 and a return pipe 26 are threadedly installed on the left and right sides of the temporary storage box 24, and the shunt pipe 25 and the return pipe 26 are connected to the inside of the valve housing 1, and manual valves 27 are installed on the outside of the shunt pipe 25 and the return pipe 26, and an observation window 28 made of transparent glass is installed on the front side of the temporary storage box 24, and a detection probe 29 for detecting liquid components is fixedly installed above the temporary storage box 24.

[0024] When using the device, first use the mounting flange 2 to fix the valve housing 1 and the pipeline. When the pressure in the pipeline reaches the standard, the sealing plug 6 is pushed up under the action of pressure (at this time, the control cylinder 7 is not started and can be freely extended and retracted). At this time, the liquid can flow normally through the connecting hole 5. When the pressure in the left pipeline drops, the sealing plug 6 is pushed downward under the elastic push of the reset spring 8. At the same time, the pressure sensor 17 detects the pressure change, so that the control cylinder 7 is turned on by the controller, and the control cylinder 7 is used to assist in pushing the sealing plug 6 downward, and finally the sealing plug 6 enters the connecting hole 5 to achieve the purpose of sealing and non-return. When the valve is used normally, part of the liquid in the valve housing 1 enters the temporary storage box 24 through the shunt pipe 25, and then flows into the valve housing 1 through the reflux pipe 26. At this time, the detection probe 29 above the temporary storage box 24 is used to detect the water quality, and the staff can observe the liquid state (such as color, etc.) through the observation window 28.

[0025] Example 2: Please refer to Figure 4-Figure 7 In order to solve the problem of reduced sealing effect of traditional devices after long-term use, this embodiment provides the following technical solutions, which ensure the sealing effect of the sealing ring by expanding the sealing ring during sealing. Specifically, the following technical solutions are disclosed: a piston mechanism for improving the sealing effect is arranged inside the sealing plug 6, and the piston mechanism includes a piston plate 14 installed inside the sealing plug 6, and the piston plate 14 fits and slides with the inner wall of the sealing plug 6, and a second magnet 13 is fixedly installed on the lower surface of the piston plate 14, and the second magnet 13 and the bottom of the sealing plug 6 penetrate and slide with each other, and a first sealing ring 15 and a second sealing ring 16 are fixedly installed on the side of the sealing plug 6, and the first sealing ring 15 and the second sealing ring 16 are both set to elastic rubber material, the first sealing ring 15 and the second sealing ring 16 are both connected to the inside of the sealing plug 6, and the second magnet 13 and the first magnet 12 repel each other, the first magnet 12 is fixedly installed on the upper surface of the sealing plate 10, and an extrusion spring 11 is fixedly installed between the lower surface of the sealing plate 10 and the inner wall of the valve housing 1, and the side of the sealing plate 10 is set to an arc structure that fits with the inner wall of the valve housing 1.

[0026] When the sealing plug 6 moves downward to achieve sealing, the first magnet 12 and the second magnet 13 approach each other, so that the second magnet 13 slides relative to the sealing plug 6 under the action of magnetic repulsion. When the second magnet 13 slides, it drives the piston plate 14 to move inside the sealing plug 6. The piston plate 14 is used to squeeze the air inside the sealing plug 6, so that the air enters the first sealing ring 15 and the second sealing ring 16, so that the first sealing ring 15 and the second sealing ring 16 expand, thereby ensuring the sealing effect of the first sealing ring 15 and the second sealing ring 16. Under the repulsive force of the first magnet 12 and the second magnet 13, the sealing plate 10 moves downward, thereby isolating the bottom of the valve housing 1 (in normal use, impurities in the water flow are settled at the bottom of the valve housing 1 under the blocking effect of the blocking plate 9).

[0027] Example 3: Please refer to Figure 8-Figure 9 In order to solve the problem that it is inconvenient to clean the inside of the valve with the traditional device, the present embodiment provides the following technical solutions, which specifically disclose: a blocking plate 9 for blocking impurities is fixedly installed at the lower end of the valve housing 1, and the blocking plates 9 are evenly distributed at equal intervals, and a sewage discharge mechanism cooperating with the blocking plate 9 is arranged at the lower end of the valve housing 1, a pressure sensor 17 for detecting the internal pressure is fixedly installed inside the left side of the valve housing 1, and a flushing nozzle 23 fixedly installed inside the valve housing 1 is arranged outside the pressure sensor 17, the sewage discharge mechanism includes a sewage discharge pipe 18 fixedly installed through the bottom of the valve housing 1, and a storage box 19 is arranged at the lower end of the sewage discharge pipe 18, and a threaded disassembly and installation structure is formed between the storage box 19 and the sewage discharge pipe 18, a filter screen 20 is fixedly installed at the upper end of the storage box 19, and a delivery pipe 21 is fixedly installed on the side of the storage box 19, the delivery pipe 21 and the flushing nozzle 23 are connected to each other, and a small delivery pump 22 is fixedly installed at the bottom of the delivery pipe 21.

[0028] The impurities at the bottom of the valve housing 1 together with a small amount of liquid enter the storage box 19 through the drain pipe 18 for storage. At the same time, the impurities are filtered by the filter screen 20 in the storage box 19. Then, the small delivery pump 22 on the outside of the side of the storage box 19 is turned on, so that the small delivery pump 22 delivers the filtered liquid to the flushing nozzle 23 through the delivery pipe 21. Then, the flushing nozzle 23 sprays the liquid into the valve housing 1 to avoid waste of liquid caused by sewage discharge. At the same time, the water flow sprayed from the flushing nozzle 23 flushes and cleans the pressure sensor 17 to avoid dirt affecting the detection accuracy of the pressure sensor 17.

[0029] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision pneumatic check valve, comprising a metal valve housing (1), wherein mounting flanges (2) are fixedly mounted on the left and right sides of the valve housing (1), and an inspection cover plate (3) is fixedly mounted on the upper end of the valve housing (1) by means of bolts, wherein: Also includes: An internal partition (4) is fixedly installed in the middle position of the valve housing (1), and a communication hole (5) is opened in the middle position of the internal partition (4), and a sealing plug (6) is arranged directly above the communication hole (5), the sealing plug (6) and the communication hole (5) cooperate with each other to seal, and a piston mechanism is arranged inside the sealing plug (6) to improve its sealing effect; A control cylinder (7) is fixedly mounted on the upper surface of the inspection cover plate (3), and a movable end of the control cylinder (7) is fixedly connected to a sealing plug (6), and a return spring (8) is fixedly mounted on the upper surface of the sealing plug (6); A blocking plate (9) for blocking impurities is fixedly mounted at the lower end of the valve housing (1), the blocking plates (9) are evenly distributed at equal intervals, and a sewage discharge mechanism cooperating with the blocking plate (9) is provided at the lower end of the valve housing (1); A pressure sensor (17) for detecting the internal pressure is fixedly installed inside the left side of the valve housing (1), and a flushing nozzle (23) fixedly installed inside the valve housing (1) is arranged outside the pressure sensor (17).

2. A high-precision pneumatic check valve according to claim 1, characterized in that: The piston mechanism comprises a piston plate (14) mounted inside the sealing plug (6), the piston plate (14) slidingly fitting against the inner wall of the sealing plug (6), and a second magnet (13) fixedly mounted on the lower surface of the piston plate (14).

3. A high-precision pneumatic check valve according to claim 2, characterized in that: The second magnet (13) and the bottom of the sealing plug (6) penetrate and slide with each other, and a first sealing ring (15) and a second sealing ring (16) are fixedly mounted on the side of the sealing plug (6), and the first sealing ring (15) and the second sealing ring (16) are both made of elastic rubber material.

4. A high-precision pneumatic check valve according to claim 3, characterized in that: The first sealing ring (15) and the second sealing ring (16) are both connected to the interior of the sealing plug (6), and the second magnet (13) and the first magnet (12) repel each other.

5. A high-precision pneumatic check valve according to claim 4, characterized in that: The first magnet (12) is fixedly mounted on the upper surface of the sealing plate (10), and a compression spring (11) is fixedly mounted between the lower surface of the sealing plate (10) and the inner wall of the valve housing (1), and the side surface of the sealing plate (10) is arranged as an arc-shaped structure that fits the inner wall of the valve housing (1).

6. A high-precision pneumatic check valve according to claim 1, characterized in that: The sewage discharge mechanism comprises a sewage discharge pipe (18) fixedly installed through the bottom of the valve housing (1), a storage box (19) is provided at the lower end of the sewage discharge pipe (18), and a threaded disassembly and installation structure is formed between the storage box (19) and the sewage discharge pipe (18).

7. A high-precision pneumatic check valve according to claim 6, characterized in that: A filter screen (20) is fixedly mounted on the upper end of the storage box (19), and a delivery pipe (21) is fixedly mounted on the side of the storage box (19).

8. A high-precision pneumatic check valve according to claim 7, characterized in that: The delivery pipe (21) and the flushing nozzle (23) are in communication with each other, and a small delivery pump (22) is fixedly mounted on the bottom end of the delivery pipe (21).

9. A high-precision pneumatic check valve according to claim 1, characterized in that: A temporary storage box (24) is installed on the front exterior of the valve housing (1), and a shunt pipe (25) and a return pipe (26) are respectively threadedly installed on the left and right sides of the temporary storage box (24), and the shunt pipe (25) and the return pipe (26) are both communicated with the interior of the valve housing (1).

10. A high-precision pneumatic check valve according to claim 9, characterized in that: Manual valves (27) are installed on the outside of the diversion pipe (25) and the return pipe (26), and an observation window (28) made of transparent glass is installed on the front side of the temporary storage box (24), and a detection probe (29) for detecting liquid components is fixedly installed above the temporary storage box (24).

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