Damping oil cylinder structure of large-caliber quick switch ball valve

Abstract

The utility model discloses a damping oil cylinder structure of a large-caliber quick switch ball valve, which is symmetrically arranged at the upper end and the lower end of the ball valve respectively. The damping oil cylinder structure comprises a box body, a rotating disc arranged in the box body and connected to the ball valve, a piston rod used for driving the rotating disc to rotate, a cylinder barrel assembled on the end face of the box body and a buffering end cover matched with the piston rod, the piston end of the piston rod is installed in the cylinder barrel and connected with the rotating disc in a matched mode, and the cylinder barrel is matched with the piston rod in a sealed mode. An oil inlet and an oil return port are formed in the buffer end cover, one-way valves are arranged on external pipelines of the oil inlet and the oil return port, a damping structure is formed by the buffer end cover and the piston rod, and when the damping positions of the buffer end cover and the piston rod are intersected, the speed of the oil cylinder is adjusted by controlling the flow channel area change of the damping positions; the two damping oil cylinders drive the valve to be rapidly opened and closed, the problem of violent impact generated in the rapid opening and closing process of the ball valve is effectively solved, and buffer nodes are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a damping oil cylinder structure of a large-caliber fast-switching ball valve. Background Art

[0002] With the development of the chemical industry, the demand for the caliber of fast-opening and closing ball valves (fast-opening and fast-closing ball valves) is increasing. However, the valve core of large-caliber ball valves (≥DN500) is large in diameter and heavy in weight, and has a large inertia when rotating. During the fast-opening process, it will cause great damage to the relative moving parts. At the same time, the high linear velocity of the spherical surface is easy to damage the valve seat seal, causing valve failure.

[0003] Generally speaking, the larger the valve diameter, the heavier the valve core weight, and the greater the driving force required for fast opening / closing, so the choice of actuator is crucial. Hydraulic actuators can better meet the requirements of operating conditions due to their advantages such as small size, large driving force, simple control, and obvious buffering effect. However, the cylinder buffer structure of conventional hydraulic actuators is usually set at both ends of the piston, the buffer stroke is short, and there are buffer nodes, which will still produce severe impact during the rapid opening and closing of the valve. This impact may cause excessive inertia force of the valve core, which in turn causes damage to the valve stem and actuator. Utility Model Content

[0004] The utility model aims to provide a large-caliber fast-opening and closing ball valve damping oil cylinder structure to solve the problem that the existing ball valve generates severe impact during the fast opening and closing process.

[0005] The utility model solves the above technical problems with the following technical solutions: a large-caliber fast-switching ball valve damping cylinder structure, the damping cylinder structure is symmetrically mounted on the upper end and the lower end of the ball valve, the damping cylinder structure comprises a box body, a rotating disk arranged in the box body and connected to the ball valve, a piston rod for driving the rotating disk to rotate, a cylinder barrel mounted on the end surface of the box body, and a buffer end cover arranged on the end surface of the cylinder barrel and matched with the piston rod, the piston end of the piston rod is installed in the cylinder barrel and matched with the rotating disk, and the cylinder barrel is sealed with the piston rod;

[0006] An oil inlet and an oil return port are respectively provided on the buffer end cover, and a one-way valve is provided on the external pipes of the oil inlet and the oil return port. The buffer end cover and the piston rod form a damping structure. When the damping positions of the buffer end cover and the piston rod intersect, the cylinder speed is adjusted by controlling the change in the flow channel area at the damping position.

[0007] Furthermore, the rotating disk is provided with a gear segment, the piston end of the piston rod is provided with a rack segment, and the gear segment is meshed with the rack segment.

[0008] Furthermore, the buffer end cover includes a cover body matched with the end surface of the cylinder barrel and a tapered rod arranged on the cover body and located inside the cylinder barrel, and the tapered rod is matched with the piston rod.

[0009] Further, the root size of the tapered rod is larger than the end size of the tapered rod.

[0010] Furthermore, the piston rod and the cylinder are sealed by a sealing ring.

[0011] The utility model has the following beneficial effects: the utility model provides a large-caliber fast-opening and closing ball valve damping cylinder structure, which has a reliable structure and good performance. The valve is driven to open and close quickly by two damping cylinders, which effectively alleviates the severe impact problem caused by the fast opening and closing of the ball valve, eliminates the buffer node, and each damping cylinder only needs to control one action, which is simple to control and operate. Due to its small size and light weight, it can greatly save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the damping oil cylinder of the utility model;

[0014] Figure 3 This is a schematic diagram of the oil inlet driven by the damping oil cylinder of the utility model;

[0015] Figure 4 This is a schematic diagram of the damping oil return of the damping oil cylinder of the utility model;

[0016] Figure 5 It is a schematic diagram of the damping flow channel of the utility model;

[0017] Figures 1 to 5 The numbers shown in the figures are respectively represented as: 1-ball valve, 2-damping cylinder structure, 3-box, 4-piston rod, 5-sealing ring, 6-cylinder barrel, 7-buffer end cover, 8-rotating disk, 9-check valve, 70-cover body, 71-conical rod. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] like Figures 1 to 4As shown, a large-caliber fast-switching ball valve damping cylinder structure, the damping cylinder structure 2 is symmetrically mounted on the upper and lower ends of the ball valve 1, respectively. The damping cylinder structure 2 comprises a housing 3, a rotating disk 8 disposed in the housing 3 and connected to the ball valve 1, a piston rod 4 for driving the rotating disk 8 to rotate, a cylinder barrel 6 assembled on the end surface of the housing 3, and a buffer end cover 7 disposed on the end surface of the cylinder barrel 6 and matched with the piston rod 4. The piston end of the piston rod 4 is installed in the cylinder barrel 6 and connected to the rotating disk 8, and the cylinder barrel 6 is sealed with the piston rod 4. The housing 3 serves as the outer shell of the damping cylinder, supports and protects the internal components, provides installation space, and ensures the stable operation of the rotating disk 8, the piston rod 4 and other components. The rotating disk 8 is connected to the ball valve 1, and the ball valve 1 is driven to switch by rotation, and the linear motion of the piston rod 4 is converted into rotational motion, thereby realizing the fast switching of the ball valve 1. The piston end and the cylinder 6 are sealed together through the sealing ring 5 to form a hydraulic chamber to transmit hydraulic power. The piston rod 4 and the buffer end cover 7 cooperate to form a damping structure. When the damping positions of the buffer end cover 7 and the piston rod 4 intersect, the cylinder speed is adjusted by controlling the change of the flow channel area at the damping position. When the damping positions intersect, the flow channel area decreases and the oil flow resistance increases, thereby achieving deceleration; otherwise, acceleration occurs.

[0020] Specifically, the rotating disk 8 has a gear segment, and the piston end of the piston rod 4 has a rack segment, and the gear segment is meshed with the rack segment.

[0021] The buffer end cover 7 is provided with an oil inlet and an oil return port, respectively. A check valve 9 is provided on the external pipes of the oil inlet and the oil return port, and the flow direction of the oil is controlled by the external pipes and the check valve 9. The hydraulic oil enters the oil cylinder from the oil inlet through the oil return port and the check valve 9, and the high-pressure hydraulic oil pushes the piston rod 4 to make a linear motion. The rack on the piston rod 4 drives the gear to rotate, and the rotation of the gear drives the ball valve 1 to open or close.

[0022] The valve stem drives the gear to rotate, and the gear drives the piston rod 4 to move linearly. The piston rod 4 squeezes the hydraulic oil in the cylinder to discharge. Under the action of the one-way valve 9, the hydraulic oil can only be discharged through the oil return port.

[0023] The buffer end cover 7 includes a cover body 70 matched with the end surface of the cylinder barrel 6 and a tapered rod 71 arranged on the cover body 70 and located inside the cylinder barrel 6. The tapered rod 71 matches the piston rod 4. The root size of the tapered rod 71 is larger than the end size of the tapered rod 71. The flow channel area is adjusted by designing the tapered surface with a small end and a large root to achieve the control of the oil cylinder speed. Specifically, as Figure 5 As shown, the surface C of the buffer end cover 7 is a conical surface, the conical surface is small at the end and large at the root, and the damping principle is: when the damping flow channel area A is larger than the oil return port area B, the damping cylinder accelerates; when the damping flow channel area A is smaller than the oil return port area B, the damping cylinder starts to decelerate.

[0024] When in use, the large-caliber fast-opening / fast-closing ball valve 1 controls the opening and closing of the valve through the upper and lower damping oil cylinders. When oil flows into the oil inlet of the upper damping oil cylinder, the valve is controlled to open, and the oil return port of the lower damping oil cylinder returns oil for buffering, which is used for valve opening damping; when oil flows into the oil inlet of the lower damping oil cylinder, the valve is controlled to close, and the oil return port of the upper damping oil cylinder returns oil for buffering, which is used for valve closing damping.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-caliber fast-switching ball valve damping cylinder structure, characterized in that: The damping cylinder structure (2) is symmetrically mounted at the upper end and the lower end of the ball valve (1), respectively. The damping cylinder structure (2) comprises a housing (3), a rotating disk (8) arranged in the housing (3) and connected to the ball valve (1), a piston rod (4) for driving the rotating disk (8) to rotate, a cylinder barrel (6) mounted on the end surface of the housing (3), and a buffer end cover (7) arranged on the end surface of the cylinder barrel (6) and cooperating with the piston rod (4); the piston end of the piston rod (4) is installed in the cylinder barrel (6) and is cooperatingly connected with the rotating disk (8); the cylinder barrel (6) and the piston rod (4) are sealingly matched; The buffer end cover (7) is provided with an oil inlet and an oil return port, respectively; a check valve (9) is provided on the external pipes of the oil inlet and the oil return port; the buffer end cover (7) and the piston rod (4) form a damping structure; when the damping positions of the buffer end cover (7) and the piston rod (4) intersect, the oil cylinder speed is adjusted by controlling the change in the flow channel area at the damping position.

2. The large-caliber fast-switching ball valve damping cylinder structure according to claim 1 is characterized in that: The rotating disk (8) has a gear segment, the piston end of the piston rod (4) has a rack segment, and the gear segment meshes with the rack segment.

3. The large-caliber fast-switching ball valve damping cylinder structure according to claim 1 is characterized in that: The buffer end cover (7) comprises a cover body (70) matched with the end surface of the cylinder barrel (6) and a tapered rod (71) arranged on the cover body (70) and located inside the cylinder barrel (6), wherein the tapered rod (71) matches with the piston rod (4).

4. The large-caliber fast-switching ball valve damping cylinder structure according to claim 3 is characterized in that: The root dimension of the tapered rod (71) is greater than the end dimension of the tapered rod (71).

5. The large-caliber fast-switching ball valve damping cylinder structure according to claim 1 is characterized in that: The piston rod (4) and the cylinder barrel (6) are sealed via a sealing ring (5).

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