High performance check valve

Abstract

The application relates to the technical field of pump bodies, and discloses a high-performance check valve, which is designed through a water baffle, a flow guide cover, a bucket-shaped cover and a pressure relief port, wherein the water baffle is unidirectionally hinged to the inner side of a first cover cylinder, the flow guide cover is slidably assembled below the bucket-shaped cover through an annular chamber, the inner side of the flow guide cover is adapted and attached to a split edge and a lower surface of the bucket-shaped cover, and a baffle ring one and a baffle ring two are respectively attached to the vertical wall of a shell and the outer wall of the first cover cylinder to form bidirectional guidance; when pumping water, the water flow introduced by the split hole lifts the lower surface of the baffle, the baffle ring one closes the pressure relief port, and high pressure is maintained; when stopping, backflow impacts the water baffle to close, and simultaneously pushes the flow guide cover to move downward, the baffle ring one leaves the pressure relief port, the baffle ring two closes the split hole, and high-pressure water is instantaneously discharged through the downwardly inclined pressure relief port, so that the problems that the check valve is closed invalidly due to sand and stone blockage and the impeller is damaged due to reverse rotation are avoided.

Description

High-performance check valve Technical Field

[0001] This invention relates to the field of pump technology, specifically to high-performance check valves. Background Technology

[0002] Submersible pumps and deep-water pumps are equipped with check valve structures. These pumps have a high head and can transport water over long distances in low-lying areas. The check valve structure (referred to as check valve) is used to prevent water backflow, especially in pumps with high water flow. It prevents water with high potential energy from flowing back through the pump body, causing the impeller mechanism inside the pump body to rotate in reverse and resulting in pump damage.

[0003] The check valve structure inside the pump body consists of a frustum-shaped cover and a retaining ring that seals against the edge of the cover. When the pump is operating, the impact force of the water along the water flow direction pushes the cover to one side, causing the cover and retaining ring to separate. Water flows out from the gap between the cover and the retaining ring and is pumped to a distance through the subsequent pipe. When the pump stops working, the water in the pipe flows back and impacts the back of the cover, causing the cover and retaining ring to close, thus achieving the water check function. However, in underwater environments containing sand and gravel particles, when the pump is operating in such an environment, these sand and gravel particles will also pass through the gap between the cover and the retaining ring. If sand and gravel particles are present in the gap when the cover and retaining ring are closed to achieve the check function, a gap will be created between them. Subsequently, the backflow of water under high pressure will pass through the gap at high speed, causing the check function to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a high-performance check valve that solves the problem that conventional check valves cannot prevent sand and gravel particles from getting stuck between the cover and the retaining ring, causing a closed gap, resulting in high-pressure backflow and high-speed penetration, which causes the check valve function to fail and the pump impeller to reverse and be damaged.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-performance check valve, comprising:

[0006] The outer casing has an inner cavity for mounting. The outer casing is mounted on one side of the impeller mechanism. The water pressurized by the impeller mechanism flows through the pressurization channel to the outer casing and is then pumped out. The outer casing has a pressure relief port on its side, which is connected to the mounting cavity.

[0007] The pressure relief mechanism includes a base fixedly mounted inside the mounting cavity. A first cover is fixedly mounted inside the base. The first cover is connected to the pressurization channel of the impeller mechanism. A semi-open annular chamber is formed between the first cover and the base. A flow guide is movably mounted inside the annular chamber. A flow diversion hole is opened on the surface of the first cover. When the impeller mechanism is in the pumping state, the flow guide is subjected to water pressure input through the flow diversion hole and is located above the annular chamber to close the pressure relief port. When the impeller mechanism is in the shutdown state, the flow guide is pushed down by the countercurrent water hammer and is located below the annular chamber to close the flow diversion hole and open the communication between the pressure relief port and the annular chamber.

[0008] The water-blocking mechanism includes a positioning seat fixedly mounted inside the first cover. A water-blocking plate is supported on one side of the positioning seat by a positioning cylinder. The edge of the water-blocking plate matches one side of the first cover. The water-blocking plate unidirectionally restricts the flow of water from inside the outer shell to the impeller mechanism.

[0009] As a further description of the above technical solution: the outer shell includes a lower shell and an upper shell, the lower shell and the upper shell are detachable and sealed connection structures, and the inner sides of the lower shell and the upper shell are combined to form an installation cavity.

[0010] As a further description of the above technical solution: the side wall of the outer shell with the pressure relief port has a downward vertical structure;

[0011] The flow guide includes a first retaining ring that slides against the vertical side wall inside the outer shell, and a second retaining ring that slides against the outer surface of the first shroud. The first retaining ring and the second retaining ring are integrally formed with a punch plate between them. The surface of the punch plate is provided with a flow guide hole, and the diameter of the flow guide hole is smaller than that of the diversion hole.

[0012] As a further description of the above technical solution: a bucket-shaped cover is provided on the upper side of the first cover cylinder, the upper edge diameter of the bucket-shaped cover is larger than the lower edge, and the side of the water baffle plate is adapted to fit the inner surface of the bucket-shaped cover.

[0013] As a further description of the above technical solution: the upper edge of the bucket-shaped cover is also integrally formed with a diversion edge, the diversion edge limits the height of the upward movement of the guide cover, and the shape of the part of the punch plate that fits with the bucket-shaped cover and the diversion edge is adapted.

[0014] As a further description of the above technical solution: the upper surface of the diversion edge is inclined downward in the direction from the inside to the outside, and the inclination direction points towards the pressure relief port.

[0015] As a further description of the above technical solution: the pressure relief port is a downward inclined channel from the mounting cavity to the outside of the outer shell, and the diversion hole is an upward inclined channel from the inside of the first cover to the outside.

[0016] As a further description of the above technical solution: a plugging post is fixedly connected to the upper surface of the base, the plugging post is located below the guide hole, the outer diameter of the plugging post is the same as the diameter of the guide hole, a spring two for pushing the guide cover upward is sleeved on the outside of the plugging post, and an anti-detachment post with a diameter smaller than the plugging post is provided at the upper end of the plugging post.

[0017] As a further description of the above technical solution: the inner side of the positioning seat is provided with a spring that pushes the positioning cylinder upward, and the inner side of the upper housing is fixedly equipped with a stop post for limiting the upward movement of the baffle plate.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: Through the design of the baffle plate, the guide hood, the bucket-shaped hood, and the pressure relief port, the baffle plate is unidirectionally hinged to the inner side of the first hood cylinder, the guide hood is slidably assembled below the bucket-shaped hood through an annular cavity, and its inner punch plate is adapted to fit the diversion edge and the lower surface of the bucket-shaped hood. The first and second retaining rings respectively fit the vertical wall of the outer shell and the outer wall of the first hood cylinder to form a bidirectional guide. When pumping water, the water flow introduced by the diversion hole lifts the lower surface of the punch plate, and the first retaining ring closes the pressure relief port to maintain high pressure. When stopping, the backflow impacts the baffle plate to close, and at the same time pushes the guide hood to move down. The first retaining ring opens the pressure relief port, and the second retaining ring closes the diversion hole. The high-pressure water is instantly discharged through the downward-sloping pressure relief port, which avoids the problem of check valve failure due to sand and gravel blockage and impeller reverse damage. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the assembly relationship between the present invention and the impeller structure;

[0021] Figure 3 is a schematic diagram showing the disassembled outer shell, water-blocking mechanism, and pressure relief mechanism of the present invention.

[0022] Figure 4 is a schematic diagram of the pressure relief mechanism of the present invention disassembled;

[0023] Figure 5 is a schematic diagram of the water flow state during depressurization according to the present invention;

[0024] Figure 6 is a schematic diagram of the water flow state during normal operation of the main body of the present invention.

[0025] In the diagram: 10. Outer shell; 11. Lower shell; 12. Upper shell; 13. Mounting cavity; 14. Pressure relief port; 20. Water baffle mechanism; 21. Water baffle plate; 22. Positioning cylinder; 23. Spring 1; 24. Positioning seat; 25. Baffle post; 30. Pressure relief mechanism; 31. First cover cylinder; 311. Bucket-shaped cover; 312. Diverting edge; 313. Diverting hole; 32. Flow guide cover; 321. Baffle ring 1; 322. Punch plate; 323. Baffle ring 2; 324. Flow guide hole; 325. Cleaning hole; 33. Base; 34. Plug post; 341. Anti-detachment post; 342. Spring 2. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0028] Referring to Figure 1, in drainage operations, the impeller mechanism of deep-water pumps and booster pumps directly determines the overall head, efficiency, and reliability of the machine. The impeller is driven to rotate by a motor, and after doing work on the liquid, it is guided through the booster flow channel in the corresponding guide casing, converting kinetic energy into pressure energy and realizing the function of boosting the liquid.

[0029] Referring to Figures 1 to 6, the high-performance check valve includes a housing 10 mounted on one side of the impeller mechanism. The housing 10 contains a pressure relief mechanism 30 and a water-blocking mechanism 20. An installation cavity 13 is provided inside the housing 10. Water pressurized by the impeller mechanism enters the housing 10 through a pressurization channel and is then pumped out. A pressure relief port 14 is provided on the side of the housing 10, and the pressure relief port 14 communicates with the installation cavity 13.

[0030] The pressure relief mechanism 30 includes a base 33 fixedly mounted inside the mounting cavity 13. A first cover 31 is fixed inside the base 33. The first cover 31 is connected to the pressurization channel of the impeller mechanism, and the pressurized water flows directly into the inside of the first cover 31. A semi-open annular chamber is formed between the first cover 31 and the base 33, and a flow guide shroud 32 is movably mounted inside this chamber. A diversion hole 313 is opened on the surface of the first cover 31, and part of the water flows into the annular chamber through the diversion hole 313.

[0031] The water-blocking mechanism 20 includes a positioning seat 24 fixed inside the first cover 31. A water-blocking plate 21 is supported on one side of the positioning seat 24 by a positioning cylinder 22. The edge of the water-blocking plate 21 matches one side of the first cover 31, thus unidirectionally restricting the water flow inside the outer shell 10 from flowing back to the impeller mechanism.

[0032] When the pump is in operation, water flows into the inner side of the first casing 31, and the impact force pushes the baffle plate 21 to one side, allowing the water to flow smoothly out of the outlet of the outer casing 10. At the same time, the diversion hole 313 introduces some water pressure into the annular chamber, pushing the guide shroud 32 upward and closing the pressure relief port 14, ensuring that the water pressure inside the outer casing 10 is stable and does not affect the normal operation of the pump.

[0033] After the impeller mechanism stops working, the backflow first impacts the baffle plate 21, causing it to close on the upper side of the first cover 31, preventing water from flowing back to the pump body and avoiding damage caused by the impeller's reverse rotation. Simultaneously, the water hammer generated by the reverse flow pushes the guide shroud 32 downwards, closing the diversion hole 313 below the annular chamber and opening the pressure relief port 14 to connect with the annular chamber. At this time, the high-pressure water on the upper side of the baffle plate 21 is released to the outside of the outer casing 10 through the pressure relief port 14.

[0034] When the baffle plate 21 and the first cover 31 cannot be completely closed due to the obstruction of sand and gravel particles, forming a gap, the high-pressure water on the upper side of the baffle plate 21 can still be released through the pressure relief port 14, significantly reducing the water flow back through the gap, so that its kinetic energy is insufficient to drive the impeller to rotate in the opposite direction, thereby avoiding damage caused by the impeller reversing.

[0035] Referring to Figure 2, the outer casing 10 consists of a lower casing 11 and an upper casing 12, which are connected by a flange-type detachable sealing structure, forming an internal mounting cavity 13. This split design allows the water-blocking mechanism 20 and the pressure relief mechanism 30 to be installed or removed as a whole, facilitating maintenance.

[0036] Referring to Figures 3 and 4, the outer casing 10 extends vertically downwards on the wall surface on the side where the pressure relief port 14 is located; the flow guide shroud 32 is composed of a first retaining ring 321, a second retaining ring 323, and an integrally formed punch plate 322. The first retaining ring 321 slides against the vertical wall surface, the second retaining ring 323 slides against the outer wall of the first shroud 31, and the punch plate 322 is located between the two retaining rings and has a flow guide hole 324, the diameter of which is smaller than that of the diversion hole 313.

[0037] Referring to Figure 6, during the pumping stage, the high-speed water flow impacts the baffle plate 21 after passing through the first cover 31 and enters the upper shell 12 area. At the same time, some water is introduced into the area below the flushing plate 322 through the diversion hole 313, forming an upward lifting force, which just offsets the downward pressure of the water above on the flushing plate 322, keeping the baffle ring 321 closed and the pressure relief port 14 closed. The guide hole 324, due to its small diameter, maintains the high pressure in the annular cavity and continuously refreshes the water flow, preventing sand and gravel deposition. The upper surface of the flushing plate 322 is also provided with a cleaning hole 325, which drives the local water flow during the rise of the guide cover 32 to further flush away any particles that may be trapped.

[0038] Referring to Figure 5, at the moment of shutdown, one stream of return water pushes the baffle plate 21 to press it tightly against the first cover cylinder 31, while the other stream acts on the upper surface of the impeller plate 322, driving the guide cover 32 to move downward as a whole: the first baffle ring 321 opens up the pressure relief port 14, and the second baffle ring 323 closes the diversion hole 313. At this time, the high-pressure water retained above the impeller plate 322 is quickly discharged through the pressure relief port 14, and the diversion hole 313 is cut off to prevent backflow into the impeller mechanism. Under the dual action, the water hammer energy is released, and the risk of impeller reversal is completely eliminated.

[0039] Referring to Figure 4, a funnel-shaped cover 311 is provided on the upper side of the first cover 31. The upper diameter of the funnel-shaped cover 311 is larger than that of the lower diameter. The side of the baffle plate 21 is adapted to fit the inner surface of the funnel-shaped cover 311. Through the design of the funnel-shaped cover 311 gradually widening in the direction of the upper shell 12, the volume of the water flow channel can be increased when the baffle plate 21 is pushed open.

[0040] Referring to Figure 4, the upper edge of the funnel-shaped cover 311 is also integrally formed with a diversion edge 312. The diversion edge 312 limits the height of the upward movement of the guide cover 32. The shape of the part of the punch plate 322 that fits with the funnel-shaped cover 311 and the diversion edge 312 is adapted. When the punch plate 322 rises to the highest position, it can fit with the lower surface of the funnel-shaped cover 311 and the diversion edge 312. It should be noted that if there are a small amount of sand and gravel particles in the middle of the fit between the punch plate 322 and the diversion edge 312 and the funnel-shaped cover 311, it will not affect the sealing effect of the pressure relief port 14. The sand and gravel particles that remain in this area will be carried away by the water flow flushed out by the cleaning hole 325 in the next movement of the guide cover 32.

[0041] Furthermore, the upper surface of the diversion edge 312 slopes downward from the inside out, with the slope pointing towards the pressure relief port 14. This facilitates guiding the return water flow towards the pressure relief port 14, promoting the pressure relief effect of the return water hammer inside the casing 10.

[0042] Referring to Figures 5 and 6, the pressure relief port 14 is a downward-sloping channel from the mounting cavity 13 to the outside of the outer casing 10. This conforms to the flow direction of the water when the pressure relief port 14 participates in the backflow water hammer relief within the outer casing 10, further promoting smooth water flow. Similarly, the diversion hole 313 is an upward-sloping channel from the inside of the first cover 31 to the outside. When the pump is working normally and water flows within the first cover 31, the inclined diversion hole 313 conforms to the flow direction of the water, allowing the water to flow more smoothly into the area below the guide shroud 32, i.e., the annular chamber, thus providing a greater support effect than water pressure to the impact plate 322.

[0043] Referring to Figures 4 to 6, a plugging post 34 is fixedly connected to the upper surface of the base 33. The plugging post 34 corresponds to the lower part of the guide hole 324, and its outer diameter is the same as that of the guide hole 324. When the punch plate 322 descends to its lowest point, the plugging post 34 can block the guide hole 324, preventing the impacting water flow from entering the annular cavity through the guide hole 324 and causing the guide cover 32 to become unstable and vibrate. An upward pushing device is sleeved on the outer side of the plugging post 34. After the water flows out from the upper side of the flushing plate 322, the second spring 342 of the flow guide 32 can slightly push the flow guide 32 upward, so that the diversion hole 313 and the annular chamber are in a connected state, which facilitates the water flowing in the first cover 31 to enter the annular chamber through the diversion hole 313. The upper end of the plugging column 34 is provided with an anti-detachment column 341 with a diameter smaller than the plugging column 34. The anti-detachment column 341 is used to guide the flow guide 324 and the plugging column 34 to accurately connect.

[0044] Referring to Figure 3, the inner side of the positioning seat 24 is provided with a spring 23 that pushes the positioning cylinder 22 upward, and the inner side of the upper housing 12 is fixedly equipped with a stop post 25 for limiting the upward movement of the water baffle 21.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-performance check valve, characterized in that, include: The outer casing (10) has an inner cavity (13) and is mounted on one side of the impeller mechanism. The water pressurized by the impeller mechanism flows through the pressurization channel to the outer casing (10) and is then pumped out. The outer casing (10) has a pressure relief port (14) on its side, which is connected to the mounting cavity (13). The pressure relief mechanism (30) includes a base (33) fixedly mounted inside the mounting cavity (13). A first cover (31) is fixedly mounted inside the base (33). The first cover (31) is connected to the pressurization channel of the impeller mechanism. A semi-open annular chamber is formed between the first cover (31) and the base (33). The chamber is equipped with a flow guide shroud (32), and the surface of the first shroud (31) is provided with a flow diversion hole (313); the water baffle mechanism (20) includes a positioning seat (24) fixedly mounted on the inner side of the first shroud (31), and a water baffle plate (21) is supported on one side of the positioning seat (24) by the positioning cylinder (22). The edge of the water baffle plate (21) matches one side of the first shroud (31), and the water baffle plate (21) unidirectionally restricts the flow of water in the outer shell (10) to the impeller mechanism; the side wall of the outer shell (10) with a pressure relief port (14) has a downward vertical structure; the flow guide shroud (32) includes a retaining ring (321) that slides against the vertical side wall of the outer shell (10), and a sliding A second baffle ring (323) is attached to the outer surface of the first cover (31). Between the first baffle ring (321) and the second baffle ring (323), a punch plate (322) is integrally formed. A guide hole (324) is opened on the surface of the punch plate (322). The diameter of the guide hole (324) is smaller than that of the diversion hole (313). A funnel-shaped cover (311) is provided on the upper side of the first cover (31). The upper edge diameter of the funnel-shaped cover (311) is larger than that of the lower edge. The side of the baffle plate (21) is adapted to fit the inner surface of the funnel-shaped cover (311). A diversion edge (312) is also integrally formed on the upper edge of the funnel-shaped cover (311). The diversion edge (312) limits the height of the upward movement of the guide cover (32). The shape of the part of the punch plate (322) that fits into the bucket-shaped cover (311) and the diversion edge (312) is adapted; the first baffle ring (321) and the second baffle ring (323) respectively fit into the vertical side wall of the outer shell (10) and the outer wall of the first cover (31), forming a bidirectional guide; when pumping water, the water flow introduced by the diversion hole (313) lifts the lower surface of the punch plate (322), and the first baffle ring (321) closes the pressure relief port (14) to maintain high pressure; when stopping, the backflow impacts the baffle plate (21) to close, and at the same time pushes the guide cover (32) to move down, the first baffle ring (321) opens the pressure relief port (14), the second baffle ring (323) closes the diversion hole (313), and the high pressure water is instantly discharged through the downward inclined pressure relief port (14);When the impeller mechanism is in pumping mode, the guide shield (32) is subjected to water pressure through the diversion hole (313), causing the first baffle ring (321) to be positioned above the annular chamber and close the pressure relief port (14). When the impeller mechanism is in a stopped state, the guide shield (32) is pushed downward by the countercurrent water hammer, and the second baffle ring (323) is positioned below the annular chamber to close the diversion hole (313) and open the pressure relief port (14), allowing the pressure relief port (14) to communicate with the annular chamber.

2. The high-performance check valve according to claim 1, characterized in that: The outer shell (10) includes a lower shell (11) and an upper shell (12). The lower shell (11) and the upper shell (12) are detachable and sealed. The inner sides of the lower shell (11) and the upper shell (12) are combined to form an installation cavity (13).

3. The high-performance check valve according to claim 2, characterized in that: The upper surface of the diversion edge (312) is inclined downward in the direction from the inside to the outside, and the inclination direction points to the pressure relief port (14).

4. The high-performance check valve according to claim 1, characterized in that: The pressure relief port (14) is a downward inclined channel from the mounting cavity (13) to the outside of the outer shell (10), and the diversion hole (313) is an upward inclined channel from the inside of the first cover (31) to the outside.

5. The high-performance check valve according to claim 2, characterized in that: A plugging post (34) is fixedly connected to the upper surface of the base (33). The plugging post (34) is located below the guide hole (324). The outer diameter of the plugging post (34) is the same as the diameter of the guide hole (324). A spring (342) that pushes the guide cover (32) upward is sleeved on the outside of the plugging post (34). An anti-detachment post (341) with a diameter smaller than the plugging post (34) is provided at the upper end of the plugging post (34).

6. The high-performance check valve according to claim 2, characterized in that: The inner side of the positioning seat (24) is provided with a spring (23) that pushes the positioning cylinder (22) upward, and the inner side of the upper housing (12) is fixedly equipped with a stop post (25) for limiting the upward movement height of the baffle plate (21).

Images