A large bore check valve

Abstract

The application discloses a large-diameter check valve, which is characterized in that the valve body, the valve seat, the valve clack, the control rod and the moving rod are included; the liquid channel is horizontally arranged in the valve body; the control rod is arranged along the vertical direction of the valve body, and the lower end of the control rod is provided with the sliding groove; the upper end of the moving rod is slidably connected in the sliding groove, and the locking structure is arranged between the moving rod and the control rod; the lower end of the moving rod is hingedly arranged with the valve clack, and the locking structure is arranged in linkage with the valve clack; the connecting part is arranged at the middle part of the moving rod, the connecting head is arranged at the first side of the valve clack, and the connecting head and the connecting part are hingedly arranged through the torsional spring; when the valve clack rotates along the connecting part to be parallel to the medium conveying direction, the valve clack controls the locking structure to be switched from the locked state to the unlocked state; the first side of the valve clack is provided with the guide camber, and the second side of the valve clack is the plane; the check valve can reduce the water hammer phenomenon and the fluid resistance.

Description

Technical Field

[0001] This invention relates to a check valve, and more specifically, to a large-diameter check valve. Background Technology

[0002] A check valve, also known as a non-return valve, one-way valve, backflow valve, or isolation valve, is a type of valve with automatic control function. Its core function is to ensure unidirectional flow of media (including liquids and gases) in a pipeline system, effectively preventing backflow, thereby providing reliable protection for equipment, maintaining stable system operation, and mitigating potential safety risks.

[0003] However, traditional check valves have revealed several problems in practical applications: First, when a pump suddenly stops and the water flow reverses, the valve disc will violently impact the valve seat at extremely high speed, triggering a strong pressure wave, i.e., water hammer. In extreme cases, the enormous impact force generated by water hammer can cause serious damage to pipelines and equipment. Second, for swing and lift check valves, when they are fully open, the valve disc or valve plate will be completely suspended in the flow channel, significantly obstructing and disturbing the main flow, leading to substantial permanent pressure loss.

[0004] Therefore, it is necessary to improve existing check valves to overcome the aforementioned defects in the prior art. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a large-diameter check valve that can reduce water hammer and reduce fluid resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a large-diameter check valve, comprising a valve body, a valve seat, a valve disc, a control rod, and a moving rod; A liquid channel is horizontally arranged inside the valve body; The control rod is installed vertically along the valve body, and a sliding groove is provided at the lower end of the control rod; The upper end of the moving rod is slidably connected to the sliding groove, and a locking structure is provided between the moving rod and the control rod. The lower end of the moving rod is hinged to the valve disc, and the locking structure is linked to the valve disc. The moving rod extends to the middle and is provided with a connecting part. The valve disc is provided with a connecting head on the first side. The connecting head and the connecting part are hinged by a torsion spring. When the valve disc rotates along the connecting part to be parallel to the medium conveying direction, the valve disc control locking structure switches from the locked state to the unlocked state. The first side of the valve disc is provided with a guide arc surface, and the second side of the valve disc is a plane.

[0007] The present invention is further configured such that: the valve seat includes a first limiting edge and a second limiting edge, both the first limiting edge and the second limiting edge are arc-shaped and are respectively disposed on both sides of the valve seat; The outer ring of the valve disc is provided with a sealing ring for abutting against the first limiting edge and the second limiting edge.

[0008] The present invention is further configured such that: the locking structure includes a driving block, a locking block and a locking groove, wherein the locking block and the locking groove are provided in two sets and are symmetrically arranged on both sides of the driving block; The locking groove is provided on the inner wall of the control rod, and the locking block is slidably connected to both sides of the moving rod and is provided in a one-to-one correspondence with the locking groove; One end of the drive block is linked to the valve disc, and the other end of the drive block is slidably connected to the moving rod and is configured to cooperate with the moving rod through a return spring; The drive block works in conjunction with the two locking blocks.

[0009] The present invention is further configured such that: positive magnetic blocks and negative magnetic blocks are provided on both sides of the driving block, the positive magnetic blocks and negative magnetic blocks are arranged along the length direction of the driving block, and a control magnet is provided on the side of the locking block facing the driving block. When the positive magnetic block corresponds to the control magnet, the positive magnetic block and the control magnet repel each other, and the positive magnetic block pushes the locking block to be inserted into the locking groove. When the driving block moves upward, the negative magnetic block corresponds to the control magnetic block, and the negative magnetic block attracts the control magnet. The negative magnetic block pulls the locking block to separate from the locking groove.

[0010] The present invention is further configured such that: an assembly groove and an assembly spring are provided on the outer wall of the moving rod, the locking block is slidably connected in the assembly groove, and the assembly spring is assembled between the bottom of the assembly groove and the locking block.

[0011] The present invention is further configured such that: a rotation limiting structure is provided at the lower end of the valve seat, the rotation limiting structure being used to limit the rotation of the valve disc.

[0012] The present invention is further configured such that: the rotation limiting structure includes a rotation limiting seat and a rotation limiting spring, the rotation limiting seat is configured in the shape of a "U", and the two ends of the rotation limiting seat are respectively located on both sides of the valve seat, the valve body is provided with a rotation limiting groove, and the rotation limiting seat is connected to the rotation limiting groove by sliding up and down through the rotation limiting spring.

[0013] The present invention is further configured such that: both ends of the rotation limit seat are provided with guide slopes, one end of the rotation limit seat abuts against the first limiting edge, and the other end of the rotation limit seat forms an assembly space with the first limiting edge.

[0014] The present invention is further configured such that multiple sets of sealing elements are provided in the rotation limiting groove.

[0015] The present invention is further configured such that the sealing ring is arranged in a Z-shaped structure.

[0016] In summary, the present invention has the following beneficial effects: In the operation mechanism of the check valve, when the flow rate of the medium inside the valve exceeds a preset threshold A, based on the action of fluid dynamics and the internal structural design of the valve, the valve disc opens and rotates under the power generated by the medium flow. As the medium flow rate further increases, when the flow rate reaches another set value B, the valve disc rotates to a state parallel to the medium flow direction.

[0017] At this point, given the unique geometric design of the valve disc—its upper end is arc-shaped and its lower end is planar—the valve disc rises continuously along a predetermined trajectory under the upward force generated by the continuous flow of the medium and the synergistic effect of the internal mechanical structure of the valve. This upward process gradually increases the area of ​​the fluid channel formed between the lower part of the valve disc and the valve seat, thereby effectively regulating the flow state of the medium and achieving the expected engineering benefits and performance optimization goals, such as reducing fluid resistance, increasing flow capacity, and reducing energy loss. Attached Figure Description

[0018] Figure 1 A schematic diagram of the check valve in the closed state; Figure 2 A schematic diagram of a check valve in low flow condition; Figure 3 A schematic diagram of a check valve in high flow state; Figure 4 This is a structural diagram of the control lever and the moving lever; Figure 5 for Figure 1 Enlarged view of point A; Figure 6 for Figure 4 Enlarged diagram of point B.

[0019] Reference numerals: 1. Valve body; 11. Liquid passage; 12. Rotation limiting groove; 2. Valve seat; 21. First limiting edge; 22. Second limiting edge; 3. Valve disc; 4. Control rod; 41. Sliding groove; 5. Moving rod; 51. Assembly groove; 52. Assembly spring; 6. Locking structure; 61. Drive block; 62. Locking block; 621. Control magnet; 63. Locking groove; 7. Positive magnetic block; 71. Negative magnetic block; 8. Rotation limiting structure; 81. Rotation limiting seat; 82. Rotation limiting spring. Detailed Implementation

[0020] 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.

[0021] Reference Figures 1 to 6 As shown, to achieve the above objectives, the present invention provides the following technical solution: a large-diameter check valve, comprising a valve body 1, a valve seat 2, a valve disc 3, a control rod 4, and a moving rod 5; A liquid passage 11 is horizontally arranged inside the valve body 1; The control lever 4 is installed vertically along the valve body 1, and a sliding groove 41 is provided at the lower end of the control lever 4; The upper end of the moving rod 5 is slidably connected to the sliding groove 41, and a locking structure 6 is provided between the moving rod 5 and the control rod 4. The lower end of the moving rod 5 is hinged to the valve disc 3, and the locking structure 6 is linked to the valve disc 3. The middle part of the moving rod 5 is provided with a connecting part, and the first side of the valve disc 3 is provided with a connecting head. The connecting head and the connecting part are hinged by a torsion spring. When the valve disc 3 rotates along the connecting part to be parallel to the medium conveying direction, the valve disc 3 controls the locking structure 6 to switch from the locked state to the unlocked state. The first side of the valve disc 3 is provided with a guide arc surface, and the second side of the valve disc 3 is a plane.

[0022] The design of this invention is intended for high-flow-rate applications. This device will change the position of valve disc 3 according to the medium flow rate to meet the needs of different applications.

[0023] The specific operating process is as follows: In the check valve's operating mechanism, when the flow rate of the medium inside the valve exceeds a preset threshold A, based on fluid dynamics and the valve's internal structural design, the valve disc 3 opens and rotates under the power generated by the medium flow. As the medium flow rate further increases, when the flow rate reaches another set value B, the valve disc 3 rotates to a state parallel to the medium flow direction.

[0024] At this point, given the unique geometric design of valve disc 3—its upper end is arc-shaped and its lower end is planar—under the upward force generated by the continuous flow of the medium and the synergistic effect of the related mechanical structures inside the valve, valve disc 3 continues to rise along a predetermined trajectory. This rising process gradually increases the area of ​​the fluid channel formed between the lower part of valve disc 3 and valve seat 2, thereby effectively regulating the flow state of the medium and achieving the expected engineering benefits and performance optimization goals, such as reducing fluid resistance, increasing flow capacity, and reducing energy loss.

[0025] The present invention is further configured such that: the valve seat 2 includes a first limiting edge 21 and a second limiting edge 22, both the first limiting edge 21 and the second limiting edge 22 are arranged in an arc shape and are respectively arranged on both sides of the valve seat 2; The outer ring of the valve disc 3 is provided with a sealing ring for abutting against the first limiting edge 21 and the second limiting edge 22.

[0026] The first limiting edge 21 and the second limiting edge 22 are both semi-circular in structure. When the valve disc 3 abuts against the first limiting edge 21 and the second limiting edge 22, it can compress the sealing ring, thereby improving the sealing effect between the valve disc 3 and the valve seat 2.

[0027] The present invention is further configured such that: the locking structure 6 includes a driving block 61, a locking block 62 and a locking groove 63, and the locking block 62 and the locking groove 63 are provided in two sets, and are symmetrically arranged on both sides of the driving block 61; The locking groove 63 is provided on the inner wall of the control rod 4, and the locking block 62 is slidably connected to both sides of the moving rod 5 and is provided in a one-to-one correspondence with the locking groove 63; One end of the drive block 61 is linked to the valve disc 3, and the other end of the drive block 61 is slidably connected to the moving rod 5 and is configured to cooperate with the moving rod 5 through a return spring; The drive block 61 works in conjunction with the two locking blocks 62.

[0028] The design of this structure can control the state of valve disc 3 according to the medium flow rate. When the medium flow rate is lower than the threshold A, the locking block 62 is inserted into the locking groove 63, and the moving rod 5 cannot be moved at this time. As the medium flow rate gradually approaches the threshold A, the valve disc 3 gradually rotates and pushes the drive block 61 upward. When the medium flow rate reaches the threshold A, the drive block 61 releases the locking effect of the locking block 62 and the locking groove 63, at which point the valve disc 3 can be further moved and adjusted.

[0029] The present invention is further configured such that: positive magnetic blocks 7 and negative magnetic blocks 71 are provided on both sides of the driving block 61, and the positive magnetic blocks 7 and negative magnetic blocks 71 are arranged along the length direction of the driving block 61; a control magnet 621 is provided on the side of the locking block 62 facing the driving block 61; when the positive magnetic block 7 corresponds to the control magnet 621, the positive magnetic block 7 and the control magnet 621 repel each other, and the positive magnetic block 7 pushes the locking block 62 to be inserted into the locking groove 63; When the drive block 61 moves upward, the negative magnetic block 71 corresponds to the control magnet 621, and the negative magnetic block 71 attracts the control magnet 621. The negative magnetic block 71 pulls the locking block 62 to separate from the locking groove 63.

[0030] The structure is designed such that as the medium flow rate gradually reaches the threshold A, the drive block 61 moves upward continuously until the negative magnetic suction block 71 corresponds to the locking block 62. At this time, the locking block 62 separates from the locking groove 63 under the action of magnetic force.

[0031] As the medium flow rate gradually decreases, the drive block 61 moves downward until the positive magnetic suction block 7 corresponds to the locking block 62. At this time, the locking block 62 is inserted into the locking groove 63 under the action of magnetic force, which plays the role of limiting and locking.

[0032] The invention is further configured such that: an assembly groove 51 and an assembly spring 52 are provided on the outer wall of the moving rod 5; a locking block 62 is slidably connected within the assembly groove 51; and the assembly spring 52 is assembled between the bottom of the assembly groove 51 and the locking block 62. This structure is designed as follows... Figure 6 As shown, the locking force between the locking block 62 and the locking groove 63 is increased by assembling the spring 52, ensuring the stability of the position of the moving rod 5.

[0033] The invention is further configured such that: a rotation limiting structure 8 is provided at the lower end of the valve seat 2, the rotation limiting structure 8 being used to restrict the rotation of the valve disc 3. This rotation limiting structure 8 is designed to prevent the valve disc 3 from rotating when liquid flows back, thereby preventing liquid backflow.

[0034] The present invention is further configured such that: the rotation limiting structure 8 includes a rotation limiting seat 81 and a rotation limiting spring 82. The rotation limiting seat 81 is configured in the shape of a "U". The two ends of the rotation limiting seat 81 are respectively located on both sides of the valve seat 2. A rotation limiting groove 12 is provided on the valve body 1. The rotation limiting seat 81 is connected to the rotation limiting groove 12 by sliding up and down through the rotation limiting spring 82.

[0035] Both ends of the rotation limit seat 81 are provided with guide slopes. One end of the rotation limit seat 81 abuts against the first limiting edge 21, and the other end of the rotation limit seat 81 forms an assembly space with the first limiting edge 21.

[0036] The design of this structure, such as Figure 1 As shown, when the liquid medium flows from left to right, the liquid will impact the left end face of the limit seat 81, causing the limit seat 81 to move downward, at which time the valve disc 3 rotates counterclockwise.

[0037] When water hammer occurs in the liquid medium, the liquid medium flows from right to left, and the liquid will impact the upper end face of valve disc 3. At this time, the lower end face of valve disc 3 and the contact surface of the rotation limit seat 81 are flat, so valve disc 3 cannot be rotated.

[0038] When the valve disc 3 is rotated clockwise to reset, the valve disc 3 will abut against the right end face of the rotation limit seat 81, thereby causing the rotation limit seat 81 to move down and the valve disc 3 to move into the assembly space.

[0039] The invention is further configured such that multiple sets of sealing elements are provided within the rotation limiting groove 12. The design of these sealing elements ensures a tight seal within the rotation limiting groove 12, preventing liquid leakage.

[0040] The present invention is further configured such that the sealing ring is arranged in a Z-shaped structure.

[0041] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A large-diameter check valve, characterized in that: It includes a valve body (1), a valve seat (2), a valve disc (3), a control lever (4), and a moving lever (5); A liquid channel (11) is horizontally arranged inside the valve body (1); The control rod (4) is installed vertically along the valve body (1), and a sliding groove (41) is provided at the lower end of the control rod (4); The upper end of the moving rod (5) is slidably connected to the sliding groove (41), and a locking structure (6) is provided between the moving rod (5) and the control rod (4). The lower end of the moving rod (5) is hinged to the valve disc (3), and the locking structure (6) is linked to the valve disc (3). The moving rod (5) has a connecting part extending from the middle, and the valve disc (3) has a connecting head on the first side. The connecting head and the connecting part are hinged by a torsion spring. When the valve disc (3) rotates along the connecting part to be parallel to the medium conveying direction, the valve disc (3) controls the locking structure (6) to switch from the locked state to the unlocked state. The valve disc (3) has a guide arc surface on its first side and a plane on its second side.

2. A large-diameter check valve according to claim 1, characterized in that: The valve seat (2) includes a first limiting edge (21) and a second limiting edge (22). The first limiting edge (21) and the second limiting edge (22) are both arc-shaped and are respectively located on both sides of the valve seat (2). The outer ring of the valve disc (3) is provided with a sealing ring for abutting against the first limiting edge (21) and the second limiting edge (22).

3. A large-diameter check valve according to claim 1, characterized in that: The locking structure (6) includes a driving block (61), a locking block (62) and a locking groove (63). The locking block (62) and the locking groove (63) are provided in two sets and are symmetrically arranged on both sides of the driving block (61). The locking groove (63) is provided on the inner wall of the control rod (4), and the locking block (62) is slidably connected to both sides of the moving rod (5) and is provided in a one-to-one correspondence with the locking groove (63); One end of the drive block (61) is linked to the valve disc (3), and the other end of the drive block (61) is slidably connected to the moving rod (5) and is configured to cooperate with the moving rod (5) through a return spring; The drive block (61) works in conjunction with the two locking blocks (62).

4. A large-diameter check valve according to claim 3, characterized in that: Positive magnetic blocks (7) and negative magnetic blocks (71) are provided on both sides of the driving block (61). The positive magnetic blocks (7) and negative magnetic blocks (71) are arranged along the length direction of the driving block (61). A control magnet (621) is provided on the side of the locking block (62) facing the driving block (61). When the positive magnetic block (7) corresponds to the control magnet (621), the positive magnetic block (7) and the control magnet (621) repel each other, and the positive magnetic block (7) pushes the locking block (62) to insert into the locking groove (63). When the drive block (61) moves upward, the negative magnetic block (71) corresponds to the control magnetic block, and the negative magnetic block (71) attracts the control magnet (621). The negative magnetic block (71) pulls the locking block (62) to separate from the locking groove (63).

5. A large-diameter check valve according to claim 3, characterized in that: The outer wall of the moving rod (5) is provided with an assembly groove (51) and an assembly spring (52). The locking block (62) is slidably connected in the assembly groove (51), and the assembly spring (52) is assembled between the bottom of the assembly groove (51) and the locking block (62).

6. A large-diameter check valve according to claim 2, characterized in that: The lower end of the valve seat (2) is provided with a rotation limiting structure (8), which is used to limit the rotation of the valve disc (3).

7. A large-diameter check valve according to claim 6, characterized in that: The rotation limiting structure (8) includes a rotation limiting seat (81) and a rotation limiting spring (82). The rotation limiting seat (81) is arranged in a "U" shape, and the two ends of the rotation limiting seat (81) are located on both sides of the valve seat (2). A rotation limiting groove (12) is provided on the valve body (1). The rotation limiting seat (81) is connected to the rotation limiting groove (12) by sliding up and down through the rotation limiting spring (82).

8. A large-diameter check valve according to claim 7, characterized in that: Both ends of the rotation limit seat (81) are provided with guide slopes. One end of the rotation limit seat (81) abuts against the first limiting edge (21), and the other end of the rotation limit seat (81) forms an assembly space with the first limiting edge (21).

9. A large-diameter check valve according to claim 6, characterized in that: Multiple sets of seals are provided inside the rotation limiting groove (12).

10. A large-diameter check valve according to claim 2, characterized in that: The sealing ring is arranged in a Z-shape.

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