Parallel type multi-stage check valve

Abstract

The application relates to the technical field of fluid control valve devices, in particular to a parallel multi-stage check valve which is characterized in that a plurality of groups of check valve assemblies which are vertically distributed are connected in parallel at the outlet end of a main flow pipe, the opening threshold of each group of the check valve assemblies increases from top to bottom, and the outlet ends of all the check valve assemblies are fixedly connected in common with a discharge pipe; each group of the check valve assemblies comprises a main valve body which is integrally fixedly connected by a liquid inlet section, a volume expansion section and a liquid outlet section in sequence, the left end of an elastic connecting piece is coaxially fixedly connected with an umbrella-shaped valve flap, the outer edge of the umbrella-shaped valve flap is coaxially fixedly connected with a conical cover which is matched with a conical inner wall, a waterproof hammer cylinder is coaxially slidably abutted with a vertical rod, the waterproof hammer cylinder is coaxially provided with an elastic buffer piece which is fixedly connected with the vertical rod, the lower end of a mounting disc is coaxially fixedly connected with a main sealing plug which is movably abutted with the inner wall of the waterproof hammer cylinder, and the vertical rod is fixedly connected with an outer sealing assembly which is used in cooperation with a sealing groove.

Description

Technical Field

[0001] This invention relates to the field of fluid control valve technology, and in particular to a parallel multi-stage check valve. Background Technology

[0002] Check valves are key components ensuring the safe operation of fluid transport systems. Their basic function is to allow fluid to flow in one direction and prevent backflow. In practical engineering, pipeline systems commonly experience load fluctuations: the diurnal flow rate of urban water supply networks can vary by 3-5 times, the flow rate of industrial cooling water systems fluctuates dramatically with equipment start-up and shutdown, and the load of heating systems varies significantly with the seasons.

[0003] To address the above issues, traditional check valves employ a single-stage valve plate design, which has the following inherent drawbacks: 1. When a single-stage valve is designed for high-load conditions, the valve opening area is large. Under low-load conditions, the fluid velocity is low and the kinetic energy is small, making it difficult to push the valve to the fully open position, causing the valve to remain in a "suspended" state for a long time. The valve repeatedly opens and closes under the influence of fluid disturbance, generating severe vibrations, which not only produce noise but also cause wear on the sealing surface, ultimately leading to valve failure. 2. If a single-stage valve plate is designed for low-load conditions, its flow area is relatively small. When the system enters high-load conditions, the valve plate opening area is insufficient, causing a sharp increase in local resistance. Taking a DN200 pipeline as an example, a mismatched check valve can increase pressure loss by 0.05-0.1 MPa, corresponding to an increase of 5%-10% in the annual power consumption of the water pump. In addition, when the valve plate resets and stops the flow, water hammer often occurs due to liquid fluctuations, which in turn affects the service life of the valve body.

[0004] In summary, existing technologies lack a check valve solution that can automatically adjust the flow area according to the load size, has a simple and reliable structure, and is suitable for variable load conditions. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a parallel multi-stage check valve. The technical solution to the problem is that it includes a main flow pipe, characterized in that multiple sets of check valve assemblies are connected in parallel at the outlet end of the main flow pipe and are evenly distributed vertically. The opening threshold of each set of check valve assemblies increases from top to bottom. The outlet ends of all the check valve assemblies are fixedly connected to a discharge pipe. Each check valve assembly includes a main valve body consisting of an inlet section, an expansion section, and an outlet section, which are integrally and fixedly connected in sequence. The inlet section is connected to the outlet flange of the main flow pipe, and the outlet section is connected to the inlet flange of the discharge pipe. The expansion section has a conical inner wall on its left side. An elastic connector is coaxially provided at the outlet end. An umbrella-shaped valve disc is coaxially and fixedly connected to the left end of the elastic connector. A conical cover that fits the conical inner wall is coaxially and fixedly connected to the outer edge of the umbrella-shaped valve disc. A waterproof hammer cylinder is fixedly connected to the upper edge of the expansion section. A vertical rod is coaxially and slidably abutted against the waterproof hammer cylinder. An elastic buffer is coaxially and fixedly connected to the vertical rod. An installation plate that movably abuts against the inner wall of the waterproof hammer cylinder is coaxially and fixedly connected to the lower end of the vertical rod. A main sealing plug that movably abuts against the inner wall of the waterproof hammer cylinder is coaxially and fixedly connected to the lower end of the installation plate. A sealing groove is coaxially and fixedly connected to the upper end of the waterproof hammer cylinder. An external sealing assembly that cooperates with the sealing groove is fixedly connected to the vertical rod.

[0006] Preferably, the outer sealing assembly includes a sealing cover coaxially fixedly connected to the vertical rod and inserted downward into the sealing groove. A baffle is coaxially fixedly connected to the lower end of the sealing cover, and a secondary sealing plug is coaxially fixedly connected to the lower end of the baffle. The inner and outer side walls of the secondary sealing plug are respectively in movable contact with the outer wall of the waterproof hammer cylinder and the inner wall of the sealing groove. An outer sealing plug is coaxially fixedly connected to the upper end of the baffle. The inner and outer side walls of the outer sealing plug are respectively in movable contact with the outer wall of the sealing cover and the inner wall of the sealing groove. Sealing fluid is accumulated at the upper ends of the inner and outer sealing plugs in the sealing groove.

[0007] Preferably, the elastic connector includes a support frame coaxially fixedly connected to the liquid outlet section, a guide sleeve coaxially fixedly connected to the support frame, a crossbar slidably connected to the guide sleeve, a left end of the crossbar coaxially fixedly connected to the umbrella-shaped valve disc, a limiting disc coaxially fixedly connected to the right end of the crossbar that movably abuts against the right end of the guide sleeve, a connecting disc coaxially fixedly connected to the crossbar, and a connecting plate fixedly connected to the left end of a connecting first spring coaxially arranged with the crossbar, the right end of the first spring being fixedly connected to the support frame.

[0008] Preferably, the elastic buffer includes two elastic rods arranged symmetrically about the vertical rod. Each of the aforementioned elastic rods includes an upper support block fixedly connected to the upper end of the vertical rod, a sliding sleeve corresponding to the upper support block fixedly connected to the upper end of the sealing groove, a buffer rod slidably connected to the sliding sleeve on the corresponding side of the upper support block fixedly connected to the upper support block, a second spring coaxially arranged on the outer side of the buffer rod, the upper and lower ends of the second elastic rod being fixedly connected to the upper support block and the sliding sleeve respectively, and a stop body coaxially fixedly connected to the lower end of the buffer rod.

[0009] Preferably, the inner wall of the guide sleeve is fixedly connected with two guide strips arranged symmetrically about its axis, and the outer edge of the crossbar is provided with two transverse grooves that correspond one-to-one with the guide strips and are slidably connected laterally.

[0010] Preferably, the inner and outer side walls of the baffle plate are in movable contact with the outer wall of the waterproof hammer cylinder and the inner wall of the sealing groove, respectively.

[0011] The beneficial effects of this invention are: 1. In its application, this invention utilizes the concept of parallel graded control in the field of check valves. By setting multiple sets of independent parallel check valve assemblies, each with a different opening threshold, the valve acquires load self-adaptive capability. This mechanism overcomes the limitations of traditional series check valves that are fully open or fully closed, achieving continuous adjustment of the flow area according to load changes, and fundamentally solving the valve plate vibration problem under variable load conditions.

[0012] 2. In use, each check valve assembly is equipped with an elastic connector connected to an umbrella-shaped valve disc. The elastic extension of the elastic connector can drive the umbrella-shaped valve disc to achieve fluid flow control. Under the action of the first spring, the umbrella-shaped valve disc closes quickly and smoothly, which can significantly reduce pipeline vibration and water hammer. The inner sealing plug and vertical rod in the waterproof hammer cylinder are also connected by an elastic buffer. When water hammer occurs, with the cooperation of the spring buffer assembly, the vertical rod and sealing plug can move in the waterproof hammer cylinder to adjust and weaken the impact of water hammer. Furthermore, under the action of the elastic buffer assembly, pipeline vibration and water hammer can be further reduced.

[0013] 3. The external sealing component, in conjunction with the sealing groove, can achieve a seal at the upper end of the waterproof hammer cylinder, thereby ensuring the overall sealing of the check valve assembly and the normal operation of each check valve assembly. This invention has a simple structure, is easy to use, and is highly practical. Attached Figure Description

[0014] Figure 1 This is a full sectional perspective view of the present invention.

[0015] Figure 2 For the present invention Figure 1 A magnified view of region A in the middle.

[0016] Figure 3 For the present invention Figure 2 A magnified view of region B in the middle.

[0017] Figure 4 For the present invention Figure 2 A magnified view of region C in the middle.

[0018] Figure 5 This is a partial stereoscopic view of the present invention.

[0019] Figure 6 This is a two-view stereoscopic view of the present invention.

[0020] Figure 7 For the present invention Figure 6 A magnified view of region D in the middle.

[0021] Figure Labels 1. Main flow pipe, 2. Check valve assembly, 3. Discharge pipe, 4. Inlet section, 5. Expansion section, 6. Outlet section, 7. Main valve body, 8. Conical inner wall, 9. Elastic connector, 10. Umbrella-shaped valve disc, 11. Conical cover, 12. Waterproof hammer cylinder, 13. Vertical rod, 14. Elastic buffer, 15. Mounting plate, 16. Main sealing plug, 17. Sealing groove, 18. Outer sealing assembly, 19. Sealing cover, 20. Baffle plate, 21. Secondary sealing plug, 22. Outer sealing plug, 23. Sealing fluid, 24. Support frame, 25. Guide sleeve, 26. Horizontal rod, 27. Limiting plate, 28. Connecting plate, 29. First spring, 30. Upper support block, 31. Sliding sleeve, 32. Buffer rod, 33. Second spring, 34. Baffle body, 35. Guide bar, 36. Horizontal groove. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-7 The specific embodiments of the present invention will be described in further detail.

[0023] In the first embodiment, the technical solution is to apply the concept of parallel hierarchical control to the field of check valves. By setting multiple sets of independent parallel check valve assemblies 2, and setting different opening thresholds for each set of check valve assemblies 2, the valve has the ability to adapt to load changes. This mechanism breaks through the limitation of traditional series check valves being fully open or fully closed, and realizes continuous adjustment of the flow area according to load changes, fundamentally solving the problem of valve plate vibration under variable load conditions.

[0024] Furthermore, in use, each check valve assembly 2 is equipped with an elastic connector 9 connected to an umbrella-shaped valve disc 10. The elastic extension of the elastic connector 9 allows the umbrella-shaped valve disc 10 to control fluid flow. Under the action of the first spring 29, the umbrella-shaped valve disc 10 closes quickly and smoothly, significantly reducing pipe vibration and water hammer. The inner sealing plug and vertical rod 13 within the waterproof hammer cylinder 12 are also connected via an elastic buffer 14. When water hammer occurs, the vertical rod 13 and sealing plug move within the waterproof hammer cylinder 12 with the help of the spring buffer assembly to adjust and weaken the impact of the water hammer. The elastic buffer assembly further reduces pipe vibration and water hammer. The outer sealing assembly 18, in conjunction with the sealing groove 17, ensures the sealing of the upper end of the waterproof hammer cylinder 12, thereby ensuring the overall sealing of the check valve assembly 2 and the normal operation of each check valve assembly 2. This invention has a simple structure, is easy to use, and is highly practical.

[0025] In Example 2, based on Example 1, specifically, in use, fluid flows from the main flow pipe 1 to each set of check valve assemblies 2. The check valve assembly 2 adaptively opens its valve disc according to the fluid pressure and its own set opening threshold. This allows for adaptive opening of the corresponding number of check valve assemblies 2 according to the load, thus adaptively regulating the fluid flow and achieving continuous adjustment of the flow area as the load changes. This fundamentally solves the valve plate vibration problem under varying load conditions. Specifically, when the fluid pressure reaches the opening threshold of the corresponding check valve assembly 2, the fluid impacts the umbrella-shaped valve disc 10, causing it to move to the right. Consequently, the conical cover 11, fixedly connected to the umbrella-shaped valve disc 10, also moves to the right and disengages from the conical inner wall 8, opening the flow path. This allows the fluid to flow sequentially from the inlet section 4 through the expansion section 5 and the outlet section 6, and then into the discharge pipe 3 for discharge. When the umbrella-shaped valve disc 10 moves to the right due to fluid impact, the crossbar 26 will also move to the right along the guide sleeve 25 under the guidance of the sliding connection between the guide bar 35 and the transverse groove 36. Consequently, the first spring 29, which is fitted on the outside of the crossbar 26 and fixedly connected to the support frame 24 and the connecting plate 28, will also be compressed. Thus, under the elastic deformation of the first spring 29, the impact of fluid impact on the umbrella-shaped valve disc 10 can be greatly reduced, thereby effectively reducing pipeline vibration. A limit plate 27 is provided at the right end of the crossbar 26 to restrict the movement of the crossbar 26 in the guide sleeve 25.

[0026] In Example 3, based on Example 2, when a sudden backflow occurs during normal fluid flow, i.e., fluid flows from the outlet section 6 to the inlet section 4, the fluid impacts the umbrella-shaped valve disc 10, causing it to move to the left. Simultaneously, the first spring 29 automatically extends due to pressure fluctuations, driving the crossbar 26 to move rapidly to the left. This causes the umbrella-shaped valve disc 10 to quickly move to the left and reset, and the conical cover 11 re-applies against the conical sidewall, thus sealing the valve body and preventing backflow. Furthermore, under the action of the first spring 29, the umbrella-shaped valve disc 10 closes quickly and smoothly, significantly reducing pipe vibration and water hammer. Further, while the rapid response of the first spring 29 greatly reduces the water hammer effect when the umbrella-shaped valve disc 10 and conical cover 11 reset to prevent backflow, residual water hammer effects still exist. To further… To mitigate its impact, a waterproof hammer cylinder 12 and an elastic buffer assembly are included. The specific working process is as follows: the remaining water hammer energy causes fluid to impact the waterproof hammer cylinder 12 and act on the main sealing plug 16, causing the main sealing plug 16 and the mounting plate 15 to move upwards. Consequently, the vertical rod 13, fixedly connected to the mounting plate 15, also moves upwards, thus weakening the water hammer energy through the elastic rod. Specifically, as the vertical rod 13 moves upwards with the mounting plate 15, the buffer rod 32, fixedly connected to the vertical rod 13 via the upper support block 30, also moves upwards along the sliding sleeve 31. This compresses the second spring 33 fixed between the upper support block 30 and the sliding sleeve 31, weakening the remaining water hammer energy through the elastic deformation of the second spring 33. The action of the second spring 33 also effectively reduces the pipe vibration caused by the remaining water hammer energy. A stop 34 is provided at the lower end of the buffer rod 32, located below the sliding sleeve 31, to prevent the buffer rod 32 from moving excessively upwards and detaching from the sliding sleeve 31.

[0027] In Example 4, based on Example 3, in order to ensure the sealing of the waterproof hammer cylinder 12, a sealing cover 19 is provided on the vertical rod 13 and inserted downward into the sealing groove 17, so as to cooperate with the baffle 20, the secondary sealing plug 21 and the outer sealing plug 22 to form a closed system, thereby ensuring the sealing effect. At the same time, the sealing groove 17 is filled with sealing liquid 23 to further form a liquid seal and ensure the sealing effect.

Claims

1. A parallel multi-stage check valve, comprising a main flow pipe (1), characterized in that, The outlet end of the main pipe (1) is connected in parallel with multiple sets of vertically distributed check valve assemblies (2). The opening threshold of each set of check valve assemblies (2) increases from top to bottom. The outlet ends of all the check valve assemblies (2) are fixedly connected to the discharge pipe (3). Each check valve assembly (2) includes a main valve body (7) consisting of an inlet section (4), an expansion section (5), and an outlet section (6) that are integrally and fixedly connected in sequence. The inlet section (4) is connected to the outlet flange of the main flow pipe (1), and the outlet section (6) is connected to the inlet flange of the discharge pipe (3). The expansion section (5) has a conical inner wall (8) on its left side. The outlet end is coaxially provided with an elastic connector (9). The left end of the elastic connector (9) is coaxially and fixedly connected with an umbrella-shaped valve disc (10). The outer edge of the umbrella-shaped valve disc (10) is coaxially and fixedly connected with a conical cover (11) that fits the conical inner wall (8). The upper edge of the expansion section (5) is fixedly... A waterproof hammer cylinder (12) is fixedly connected to the waterproof hammer cylinder (12), and a vertical rod (13) is slidably abutted against the waterproof hammer cylinder (12). An elastic buffer (14) is fixedly connected to the vertical rod (13) on the waterproof hammer cylinder (12) on the same axis. An installation plate (15) is fixedly connected to the lower end of the vertical rod (13) on the same axis and moves against the inner wall of the waterproof hammer cylinder (12). A main sealing plug (16) is fixedly connected to the lower end of the installation plate (15) on the same axis and moves against the inner wall of the waterproof hammer cylinder (12). A sealing groove (17) is fixedly connected to the upper end of the waterproof hammer cylinder (12) on the same axis. An external sealing assembly (18) that works with the sealing groove (17) is fixedly connected to the vertical rod (13).

2. The parallel multi-stage check valve according to claim 1, characterized in that, The outer sealing assembly (18) includes a sealing cover (19) that is coaxially fixedly connected to the vertical rod (13) and inserted downward into the sealing groove (17). A baffle (20) is coaxially fixedly connected to the lower end of the sealing cover (19). A secondary sealing plug (21) is coaxially fixedly connected to the lower end of the baffle (20). The inner and outer side walls of the secondary sealing plug (21) are in movable contact with the outer wall of the waterproof hammer cylinder (12) and the inner wall of the sealing groove (17), respectively. An outer sealing plug (22) is coaxially fixedly connected to the upper end of the baffle (20). The inner and outer side walls of the outer sealing plug (22) are in movable contact with the outer wall of the sealing cover (19) and the inner wall of the sealing groove (17), respectively. Sealing liquid (23) is accumulated at the upper end of the inner and outer sealing plugs (22) of the sealing groove (17).

3. The parallel multi-stage check valve according to claim 1, characterized in that, The elastic connector (9) includes a support frame (24) coaxially fixedly connected to the liquid outlet section (6). The support frame (24) is coaxially fixedly connected to a guide sleeve (25). The guide sleeve (25) is laterally slidably connected to a crossbar (26). The left end of the crossbar (26) is coaxially fixedly connected to an umbrella-shaped valve disc (10). The right end of the crossbar (26) is coaxially fixedly connected to a limiting disc (27) that movably abuts against the right end of the guide sleeve (25). The crossbar (26) is coaxially fixedly connected to a connecting disc (28). The connecting disc (28) is fixedly connected to the left end of a connecting first spring (29) coaxially set with the crossbar (26). The right end of the first spring (29) is fixedly connected to the support frame (24).

4. The parallel multi-stage check valve according to claim 1, characterized in that, The elastic buffer (14) includes two elastic rods arranged symmetrically about the vertical rod (13); Each of the elastic rods includes an upper support block (30) fixedly connected to the upper end of the vertical rod (13), a sliding sleeve (31) corresponding to the upper support block (30) fixedly connected to the upper end of the sealing groove (17), a buffer rod (32) slidably connected to the upper support block (30) and the sliding sleeve (31) on the corresponding side of the upper support block (30), a second spring (33) coaxially provided on the outer side of the buffer rod (32), the upper and lower ends of the second elastic rod are fixedly connected to the upper support block (30) and the sliding sleeve (31) respectively, and a stop (34) is coaxially fixedly connected to the lower end of the buffer rod (32).

5. The parallel multi-stage check valve according to claim 1, characterized in that, The inner wall of the guide sleeve (25) is fixedly connected with two guide strips (35) arranged symmetrically about its axis. The outer edge of the crossbar (26) is provided with two transverse grooves (36) that correspond one-to-one with the guide strips (35) and are slidably connected laterally.

6. The parallel multi-stage check valve according to claim 1, characterized in that, The inner and outer side walls of the baffle (20) are respectively in contact with the outer wall of the waterproof hammer cylinder (12) and the inner wall of the sealing groove (17).

Images