A mobile back pressure valve control system

Abstract

The application relates to the technical field of gas turbine testing, and discloses a movable back pressure valve control system. By arranging an integrated structure of a guide rail, a moving trolley and a support, an originally fixed back pressure valve system is transformed into a unit capable of directional movement. This enables the back pressure valve to be quickly and easily transferred and docked between different workstations or different pipeline interfaces according to different experimental requirements, thereby saving heavy disassembly, assembly and transportation work and greatly improving the utilization rate and experimental efficiency of the equipment. By arranging a shock absorption and deviation prevention device, through the cooperation of the double springs with adjustable pre-tightening force and the T-shaped track and the I-shaped bottom plate, the pipeline vibration energy can be effectively absorbed, and the back pressure valve is prevented from being damaged by vibration. Meanwhile, the device cooperates with the guide rail to limit the lateral deviation of the trolley, thereby ensuring the stability of movement and work. In cooperation with the brake assembly arranged at the roller, the trolley can be reliably locked at any position, thereby providing double protection for the safe operation of the whole system.

Description

Technical Field

[0001] This application relates to the field of gas turbine testing technology, specifically to a movable back pressure valve control system. Background Technology

[0002] The research and development and testing of high-end power equipment such as heavy-duty gas turbines require combustion chamber testing under high pressure or even full pressure conditions. In such tests, the back pressure regulating valve is a key piece of equipment, providing a precise and stable back pressure environment to the combustion chamber through throttling. However, existing technologies suffer from the following prominent problems and shortcomings: 1. Traditional back pressure valves and their drive mechanisms are typically fixedly mounted on test benches and cannot be moved. When different projects are required or when docking with different interfaces, cumbersome disassembly, assembly, transportation, and repositioning processes are necessary, which is inefficient and can easily damage the valve's delicate sealing structure during hoisting and docking. Furthermore, the pressure pulsation of the fluid in the test pipeline will generate strong vibrations, and traditional fixed supports lack effective vibration damping mechanisms, so the vibrations are directly transmitted to the delicate back pressure valve, affecting its lifespan and reliability in the long run.

[0003] 2. Many back pressure valves are driven by a single hydraulic cylinder. It is difficult to ensure that the connecting surfaces are flush when the valve core and housing are aligned, which will generate additional mechanical stress, causing the valve core to be misaligned and the guide components to wear unevenly. This not only increases friction and damages the sealing surface, but also affects the positioning accuracy of the valve core, ultimately leading to inaccurate back pressure control and threatening test safety. Utility Model Content

[0004] In view of the above problems, the present application provides a movable back pressure valve control system, which can easily move the back pressure valve to meet the needs of rapid installation and transfer, thereby improving work efficiency, and ensuring that the valve core shell is subjected to balanced force during the opening and closing of the valve body, thereby ensuring that the valve core shell and the valve seat always remain coaxial.

[0005] According to one aspect of the embodiments of this application, a movable back pressure valve control system is provided. The movable back pressure valve control system includes two parallel guide rails, a trolley mounted on the guide rails via rollers, a bracket fixedly installed above the trolley, a back pressure valve fixedly installed above the bracket, and dual hydraulic cylinders. The dual hydraulic cylinders are located on both sides of the back pressure valve. The back pressure valve includes a valve seat and a valve core. The valve seat includes a flue gas inlet pipe, the inner wall of the end of the flue gas inlet pipe being flared in a trumpet shape. The valve core includes a tubular outer shell and a spherical protrusion located inside the tubular outer shell. The tubular outer shell is configured to accommodate the end of the flue gas inlet pipe, and the spherical protrusion matches the trumpet-shaped flare. The free ends of the dual hydraulic cylinders are connected to the tubular outer shell. Braking components are provided at the rollers of the trolley. A shock-absorbing and anti-deviation device for reducing vibration is provided on both the trolley and the ground.

[0006] In some embodiments, the shock-absorbing and anti-deviation device includes: an anti-rotation plate fixed to the end of the mobile trolley, having an inverted U-shaped cross-section; a threaded base plate slidably disposed below the anti-rotation plate; a lead screw vertically penetrating the anti-rotation plate, with a rotating wheel at its top end, the lead screw being threadedly connected to the threaded base plate; a first shock-absorbing spring disposed between the bottom of the threaded base plate and the anti-rotation plate; a second shock-absorbing spring disposed between the top of the anti-rotation plate and the rotating wheel; and a limiting component disposed on the ground for limiting the lifting height of the threaded base plate relative to the ground.

[0007] In some embodiments, the limiting component includes a T-shaped track, which is fixedly disposed on the ground and located between the two guide rails and extends parallel to the guide rails; the wire base plate has an I-shaped cross section, and its lower wing plate extends downward and is embedded in the groove of the T-shaped track, and can slide along the length direction of the T-shaped track.

[0008] In some embodiments, an air seal structure is provided between the flue gas inlet pipe and the pipe housing.

[0009] In some embodiments, the dual hydraulic cylinders are power cylinders and are connected to a hydraulic synchronization circuit, which is configured to drive the piston rods of the two hydraulic cylinders to move synchronously and lock them after they reach the target position.

[0010] The beneficial effects of this application are: 1. This application transforms the originally fixed back pressure valve system into a directionally movable unit by setting an integrated structure of guide rails, a moving trolley, and a support. This allows the back pressure valve to be quickly and easily moved and connected between different workstations or different pipe interfaces according to different experimental needs, eliminating the heavy disassembly and transportation work and greatly improving the utilization rate of the equipment and experimental efficiency.

[0011] 2. This application incorporates a shock-absorbing and anti-deviation device. Through the coordination of adjustable preload double springs and a T-shaped rail with an I-shaped base plate, it effectively absorbs pipeline vibration energy, preventing damage to the back pressure valve. Simultaneously, this device, working in conjunction with the guide rail, limits the lateral deviation of the trolley, ensuring stability during movement and operation. Combined with a braking assembly located at the rollers, it achieves reliable locking of the trolley at any position, providing double protection for the safe operation of the entire system.

[0012] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the overall front view of the device provided in the embodiments of this application; Figure 2 This is a partial side view of the device provided in an embodiment of this application; Figure 3 This is a partial top view of the device provided in an embodiment of this application; Figure 4 This is a partial cross-sectional structural diagram of the back pressure valve of the device provided in an embodiment of this application; Figure 5 This is a schematic diagram of the cross-sectional structure of the swing arm provided in an embodiment of this application; Figure 6 A schematic diagram of an electro-hydraulic actuator provided in an embodiment of this application.

[0014] The reference numerals in the detailed embodiments are as follows: The system includes a movable back pressure valve control system 100, a guide rail 110, a moving trolley 120, rollers 121, a bracket 130, a back pressure valve 140, a valve seat 141, a flue gas inlet pipe 141a, a flared flare 141b, an air seal structure 141c, a valve core 142, a tubular outer shell 142a, a spherical protrusion 142b, a dual hydraulic cylinder 150, a brake assembly 160, a shock absorption and anti-deviation device 170, an anti-rotation plate 171, a threaded base plate 172, a lead screw 173, a first shock absorption spring 174, a second shock absorption spring 175, and a limit assembly 176. Detailed Implementation

[0015] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0016] For details, please refer to Figures 1 to 5 , Figure 1This is a schematic diagram of the overall front view of the device provided in an embodiment of this application. Figure 2 This is a partial side view of the device provided in an embodiment of this application. Figure 3 This is a partial top view of the device provided in an embodiment of this application. Figure 4 This is a partial cross-sectional structural diagram of the back pressure valve of the device provided in an embodiment of this application. Figure 5 This is a schematic cross-sectional view of the swing arm provided in an embodiment of this application. The movable back pressure valve 140 control system 100 includes two parallel guide rails 110, a trolley 120 mounted on the guide rails 110 via rollers 121, a bracket 130 fixedly mounted above the trolley 120, a back pressure valve 140 fixedly mounted above the bracket 130, and dual hydraulic cylinders 150. The dual hydraulic cylinders 150 are located on both sides of the back pressure valve 140. Specifically, the two guide rails 110 are used to limit and guide the travel direction of the trolley 120. Typically, the guide rails 110 are installed below the ground, and the rollers 121 below the trolley 120 are adapted to the guide rails 110. The dual hydraulic cylinders 150 are used to move the tubular housing 142a to achieve the opening and closing control of the valve body. The back pressure valve 140 includes a valve seat 141 and a valve core 142. The valve seat 141 includes a flue gas inlet pipe 141a, the inner wall of which is flared into a trumpet shape 141b. The valve core 142 includes a tubular outer shell 142a and a spherical protrusion 142b located inside the tubular outer shell 142a. The tubular outer shell 142a is configured to receive the end of the flue gas inlet pipe 141a, and the spherical protrusion 142b matches the trumpet-shaped flare 141b. The free end of the pressure cylinder 150 is connected to the tubular outer shell 142a. When the dual hydraulic cylinder 150 extends, it drives the tubular outer shell 142a closer to the flue gas inlet pipe 141a. At this time, the spherical protrusion 142b is inserted into the flared end 141b of the flue gas inlet pipe 141a, and the valve body will be closed. Conversely, when the dual hydraulic cylinder 150 retracts, it drives the tubular outer shell 142a away from the flue gas inlet pipe 141a, and the flow channel between the valve seat 141 and the valve core 142 will be opened. A brake assembly 160 is provided at the roller 121 of the mobile trolley 120. The brake assembly 160 can adopt existing technology, such as the brake assembly 160 on common universal wheels, etc., as long as it meets the usage requirements, there is no restriction here. The mobile trolley 120 and the ground are jointly provided with a shock-absorbing and anti-deviation device 170 to reduce vibration.

[0017] In this embodiment, during operation, when a change of experimental station is required, the operator releases the brake assembly 160 and pushes the mobile trolley 120, moving it along the parallel guide rail 110 via rollers 121 to the front of the target flue gas inlet pipe 141a. The brake assembly 160 is then activated to initially secure the trolley. During the test, the hydraulic synchronization circuit drives the dual hydraulic cylinders 150 to extend and retract synchronously, causing the valve core 142 to move linearly within the tubular outer shell 142a. This controls the positional relationship between the valve core 142 and the valve seat 141, and further controls the opening and closing of the valve body through the aforementioned movement. Simultaneously, when vibrations from the pipeline system are transmitted to the mobile trolley 120, the shock-absorbing and anti-deviation device 170, located between the trolley and the ground, is activated. Its internal elastic elements effectively absorb and buffer vibration energy, suppressing trolley swaying and further preventing damage to the valve body. After the entire test is completed, the hydraulic cylinder drives the valve core 142 to reset, releasing the brake, allowing the entire system to be moved away from the station.

[0018] In some embodiments, the shock-absorbing and anti-deviation device 170 includes: an anti-rotation plate 171, fixed to the end of the mobile trolley 120, having an inverted U-shaped cross-section; a wire-lined base plate 172, slidably disposed below the anti-rotation plate 171; a lead screw 173, vertically penetrating the anti-rotation plate 171, with a rotating wheel at its top, and the lead screw 173 threadedly connected to the wire-lined base plate 172; a first shock-absorbing spring 174, disposed between the bottom of the wire-lined base plate 172 and the anti-rotation plate 171; a second shock-absorbing spring 175, disposed between the top of the anti-rotation plate 171 and the rotating wheel; and a limiting component 176, disposed on the ground, for limiting the lifting height of the wire-lined base plate 172 relative to the ground. For ease of explanation, this application provides a preferred embodiment of a shock-absorbing and anti-deviation device 170. Specifically, when the moving trolley 120 travels to the target position, the rotating wheel is rotated, which further drives the lead screw 173 to rotate. At this time, the lead screw 173 is screwed to the wire-loaded base plate 172, and the wire-loaded base plate 172 is limited by the anti-rotation plate 171 and cannot rotate. Therefore, the wire-loaded base plate 172 will be raised until it is blocked by the limiting component 176 and cannot be raised further. At this time, the lead screw 173 can continue to rotate, and the lead screw 173 will move downward and continue to be inserted into the wire-loaded base plate 172. During this process, the second shock-absorbing spring 175 will be continuously compressed, and the clamping force of the second shock-absorbing spring 175 on the anti-rotation plate 171 will continuously increase. Thus, when the pipeline system vibrates, the overall vibration of the moving trolley 120 will be transmitted to the first shock-absorbing spring 174 and the second shock-absorbing spring 175, thereby reducing the risk of damage to the exhaust valve caused by pipeline vibration. The spring can be adjusted by the number of rotations of the lead screw 173.

[0019] In some embodiments, the limiting component 176 includes a T-shaped track, which is fixedly disposed on the ground and located between two guide rails 110 and extends parallel to the guide rails 110; the wire-feathered base plate 172 has an I-shaped cross-section, and its lower wing plate extends downward and is embedded in the groove of the T-shaped track, and can slide along the length direction of the T-shaped track. This application embodiment proposes a specific arrangement of the limiting component 176, in which a portion of the wire-feathered base plate 172 is always inserted into the groove of the T-shaped track during the movement of the mobile trolley 120, thereby providing secondary limiting for the movement of the mobile trolley 120 and preventing it from deviating during its movement.

[0020] In some embodiments, an air seal structure 141c is provided between the flue gas inlet pipe 141a and the pipe housing. In this embodiment, the air seal structure 141c is provided to enhance its airtightness.

[0021] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic diagram of the electro-hydraulic actuator provided in an embodiment of this application. The dual hydraulic cylinders 150 are power cylinders and are connected to a hydraulic synchronization circuit. The hydraulic synchronization circuit is configured to drive the piston rods of the two hydraulic cylinders to move synchronously and lock them after reaching the target position. In this application, the pistons of the synchronization cylinders have the same diameter, and their piston chambers are connected to the oil pump outlet and the piston chamber of the power cylinder through a control valve group, forming a closed-loop oil circuit. This allows the displacement of the piston of the synchronization cylinder to be transmitted equally to the piston rod of the power cylinder, thereby achieving synchronous operation of the dual hydraulic cylinders 150. Since the synchronous control of the operation of the dual hydraulic cylinders 150 is common knowledge and has been fully disclosed, it will not be described further here.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A portable back pressure valve control system, characterized in that, It includes two parallel guide rails, a mobile trolley mounted on the guide rails via rollers, a bracket fixedly installed above the mobile trolley, a back pressure valve fixedly installed above the bracket, and two hydraulic cylinders located on both sides of the back pressure valve. The back pressure valve includes a valve seat and a valve core. The valve seat includes a flue gas inlet pipe with an inner wall at the end of the flue gas inlet pipe that is flared in a funnel shape. The valve core includes a tubular outer shell and a spherical protrusion located inside the tubular outer shell. The tubular outer shell is configured to receive the end of the flue gas inlet pipe, and the spherical protrusion matches the funnel-shaped flare. The free end of the dual hydraulic cylinder is connected to the tubular outer shell. The mobile trolley is equipped with a brake assembly at its rollers, and the mobile trolley and the ground are both equipped with a shock-absorbing and anti-deviation device to reduce vibration.

2. The movable back pressure valve control system according to claim 1, characterized in that, The shock absorption and anti-deviation device includes: An anti-rotation plate is fixed to the end of the mobile trolley, and its cross-section is inverted U-shaped; A wire-lined base plate is slidably disposed below the anti-rotation plate; A lead screw vertically penetrates the anti-rotation plate, and a rotating wheel is provided at its top end. The lead screw is threadedly connected to the threaded base plate. The first shock-absorbing spring is disposed between the bottom of the wire-lined base plate and the bottom of the anti-rotation plate; The second shock-absorbing spring is disposed between the top of the anti-rotation plate and the rotating wheel; A limiting component, disposed on the ground, is used to limit the lifting height of the wire base plate relative to the ground.

3. The movable back pressure valve control system according to claim 2, characterized in that, The limiting component includes a T-shaped track, which is fixedly installed on the ground and located between the two guide rails and extends parallel to the guide rails; The cross-section of the wire-bearing base plate is I-shaped, and its lower flange extends downward and is embedded in the groove of the T-shaped track, and can slide along the length direction of the T-shaped track.

4. The movable back pressure valve control system according to claim 1, characterized in that, An air seal structure is provided between the flue gas inlet pipe and the pipe casing.

5. The movable back pressure valve control system according to claim 1, characterized in that, The dual hydraulic cylinders are power cylinders and are connected to a hydraulic synchronization circuit. The hydraulic synchronization circuit is configured to drive the piston rods of the two hydraulic cylinders to move synchronously and lock them after they reach the target position.

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