CN213744963U - Piston direct-acting type velocimeter - Google Patents

Abstract

The utility model provides a piston direct action type tachymeter belongs to the pipeline transportation equipment field, including runner, wheel carrier, loop bar and mounting bracket, the loop bar is established in the mounting bracket and the two coaxial device, the loop bar is relative the mounting bracket reciprocates, the loop bar is located the outside of mounting bracket upper end is equipped with solid fixed cylinder, gu fixed cylinder's upper end is equipped with threaded connection's regulation spiral shell lid, gu fixed cylinder's inside is equipped with the pretension spring, the pretension spring is in advance the coaxial setting of loop bar, the pretension spring is established adjust between the location platform of spiral shell lid and loop bar, the loop bar upwards stretches out adjust the spiral shell lid setting, and the fixed trigger bar that is equipped with the horizontal extension. The utility model discloses a mechanical structure formula control, the velocity of flow reaches the setting value, explodes the trigger of pipe controller, and the valve does not need any outside electric energy and other energy, can close to totally closing according to the first fast slow double speed two stages that set for by oneself, reliable and stable.

Description

Piston direct-acting type velocimeter

Technical Field

The utility model belongs to the pipeline conveying equipment field relates to piston direct action type tachymeter.

Background

In order to ensure the running safety of pipelines and prevent various immeasurable damages to downstream living and production facilities caused by a large amount of water overflowing when the pipelines burst, a pipe burst protection valve is adopted to ensure that the pipelines are quickly, automatically and reliably closed when a pipe burst accident happens, an upstream water source is cut off, and the downstream safety is ensured. The pipe explosion protection device is also called an emergency blocking valve, an emergency cut-off valve and the like in the actual engineering, and the pipe explosion protection function is realized by a hydraulic control slow-closing butterfly valve and a speed measurement component.

The pipe explosion protection controller is core control equipment of a hydraulic control pipe explosion shutoff valve, the reliability of the pipe explosion controller determines whether the function of the pipe explosion valve can be realized, when the flow rate of a pipeline is over, the pipe explosion protection controller acts accurately, a hydraulic valve on a protector is enabled to reverse accurately, an oil way is connected, a heavy hammer falling valve of the hydraulic control shutoff valve is closed, and therefore the whole pipeline system is protected. When the flow rate of a medium in the pipeline changes, the force acting on a rotating rod or a rotating sheet of the protector at the inner section of the pipeline changes, the stroke hydraulic valve is driven to change the direction by a lever, and a sensor and an adjusting device are arranged at the upper section of the outer part of the pipeline and are in a proportional curve with the water power.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a piston direct action type tachymeter, adopt mechanical structure formula control, the velocity of flow reaches the setting value, explodes the trigger of pipe controller, and the valve does not need any outside electric energy and other energy, can close to closing completely according to the first-speed-last slow two stages that set for by oneself, reliable and stable.

In order to solve the technical problem, the utility model discloses a technical scheme is: the piston direct-acting type velocimeter comprises a rotating wheel, a wheel carrier, a movable rod and a mounting frame, wherein the movable rod is arranged in the mounting frame and is coaxial with the mounting frame, the movable rod moves up and down relative to the mounting frame, a fixed cylinder is arranged outside the upper end of the mounting frame, an adjusting screw cap in threaded connection is arranged at the upper end of the fixed cylinder, a pre-tightening spring is arranged inside the fixed cylinder, the pre-tightening spring is arranged coaxially with the movable rod in advance, the pre-tightening spring is arranged between the adjusting screw cap and a positioning table of the movable rod, and the movable rod extends upwards out of the adjusting screw cap and is fixedly provided with a horizontally extending trigger rod;

the lower end of the movable rod is provided with a roller, the lower end of the mounting frame is provided with a rotating wheel which is connected in a rotating mode, the rotating wheel is of a wheel-shaped structure with a plurality of corners protruding, and the protruding portion of the rotating wheel is arranged in a tangent mode with the roller.

Furthermore, the lower extreme of adjusting the spiral cover is equipped with tight set nut, tight set nut with solid fixed cylinder threaded connection, the junction of mounting bracket and pipeline is equipped with two sealing washers, the last lower extreme of movable rod with all be equipped with the sealing washer between the mounting bracket.

Furthermore, the number of the piston direct-acting velocimeters is two, and the two piston direct-acting velocimeters are connected in parallel or in series on the medium transmission pipeline.

Furthermore, the piston direct-acting type velocimeter is provided with a release assembly in series, when the flow rate exceeds a set value, the release assembly is triggered to act, the state is switched to a connection state from a disconnection state, the release assembly is connected with an energy accumulator, the pressure in the energy accumulator is connected with a valve opening cavity of the oil cylinder through a normally-open stop valve and a one-way valve, a heavy hammer mechanism on the corresponding valve is lifted, and the valve is in a normally-open state.

Further, the oil cylinder is a double-speed hydraulic cylinder, the first section is closed at 75-85 degrees, the second section is closed at 5-15 degrees within 6-10 seconds; 18-22s closed.

Further, the hydro-cylinder includes the cylinder body, the one end of cylinder body is equipped with slowly closes the jar tail, and the other end is equipped with the cylinder head, be equipped with coaxial piston in the cylinder body, slowly close and be equipped with oil inlet and oil feed check valve on the jar tail, still be equipped with hollow pole in slowly closing the jar tail, hollow pole passes slowly close jar tail setting, be equipped with the hole of keeping away on the piston, hollow pole with keep away the corresponding setting of hole, under the hydro-cylinder off-state, hollow pole stretches into keep away the hole setting, slowly close and be equipped with out oil on the jar tail and use the slow joint flow valve, slowly close the jar tail and keep away from the one end of piston is equipped with slowly and closes the piece, slowly close the piece and be used for adjusting the length that hollow pole stretched into the piston.

Furthermore, set firmly adjusting screw on the slow closure piece, adjusting screw with hollow rod threaded connection, the slow closure piece is kept away from the one end of hollow rod is equipped with the jam, hollow rod with keep away and be equipped with a plurality of sealing washers in the middle of the hole, the piston with be equipped with a plurality of sealing washers between the inner wall of cylinder body.

Compared with the prior art, the utility model has the advantages and positive effect as follows.

1. The utility model adopts a mechanical structure, the flow velocity reaches the set value, the pipe explosion controller is triggered, the valve does not need any external electric energy and other energy sources, the valve can be closed to full-closed in two stages according to the set first-speed and second-speed, the operation is stable and reliable, when two speed measurement components are connected in parallel, the safety redundancy type is formed, two arbitrary actions are realized, the corresponding hydraulic valve is triggered, and the valve is immediately acted and closed; when the two speed measuring components are connected in series, an anti-misoperation safety type is formed, the two speed measuring components act to trigger the two hydraulic valves, the valves act to be closed, each mechanical explosion controller can also be provided with a proximity switch, when the explosion controller acts, the proximity switch is also closed, signals are transmitted into the PLC and the DCS, and therefore electricity, liquid and machinery form a closed-loop control system;

2. in the utility model, the balance weight type component can adjust the balance of the guide plate and change the set value of the flow velocity by adjusting the length of the force arm between the balance weight and the balance lever; when the piston direct-acting assembly adjusts the screw cap to reach a proper position, the elasticity of the spring can be adjusted, the set value of the flow rate is changed, the screw cap is locked by the fastening nut, the setting misoperation is prevented, as long as the flow rate reaches the set value, the pipe explosion controller is triggered, and the valve can be automatically closed to full closure in two stages of first-speed and second-speed according to the set value without any external electric energy and other energy;

3. the installation and debugging of the speed measuring components on the two sides of the utility model are carried out externally, the flanges are not required to be opened, the installation and debugging are very convenient, even if the underwater parts of the two speed measuring components are maintained, the whole speed measuring components can be detached only by loosening the connected flanges, and the installation and debugging of the speed measuring components on the two sides are simple, rapid and convenient;

4. the utility model discloses in, when the speed measuring subassembly transmitted the signal of pressure differential, the release subassembly can accept and in time make corresponding reaction reliably, and when the operating mode resumes normal operating condition, the piston directly moved the subassembly and directly moved and resets, need not manual operation, and balanced weight subassembly only need move the weight gently with the hand, can answer initial condition, easily restart, and balanced weight type local resistance coefficient 0.005, piston directly moves type local resistance coefficient 0.002.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic view of the piston direct-acting velocimeter of the present invention connected in series with a balance weight assembly;

FIG. 2 is a hydraulic schematic diagram of the piston direct-acting velocimeter of the present invention;

FIG. 3 is a schematic view of the balance weight assembly of the present invention;

FIG. 4 is a perspective view of the weight structure of the present invention;

fig. 5 is a schematic structural diagram of the piston linear motion assembly of the present invention;

fig. 6 is a structural schematic of the oil cylinder of the present invention.

Reference numerals:

1. an accumulator; 21. a balancing weight component; 211. a baffle; 212. a balance lever; 213. a stroke hydraulic valve; 214. a counterweight; 215. locking the nut; 216. a drive shaft; 217. installing a body; 218. installing a flange; 219. a proximity switch; 22. a piston translation assembly; 221. a rotating wheel; 222. a wheel carrier; 223. a movable rod; 2231. a roller; 224. a mounting frame; 225. a fixed cylinder; 226. tightening the nut; 227. pre-tightening the spring; 228. adjusting a screw cap; 229. a trigger lever; 3. a release assembly; 5. a stop valve; 6. an oil cylinder; 61. a cylinder body; 62. a cylinder head; 63. slowly closing the tail of the cylinder; 64. an oil inlet; 66. a piston; 661. avoiding holes; 67. a hollow shaft; 671. a quick oil through hole; 68. a slow closing block; 681. adjusting the screw rod; 682. blocking; 7. a one-way valve; 8. and (4) heavy hammer structure.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-6, the utility model relates to a piston direct-acting velocimeter, i.e. piston direct-acting assembly, the system of its application is a burst tube protection safety device, including two velocity measurement assemblies that are arranged in series or in parallel, the velocity measurement assembly is used for monitoring the medium flow velocity on the pipeline, each velocity measurement assembly is all connected in series and is provided with a release assembly 3, when the velocity of flow exceeds the set value, the release assembly 3 is triggered to act, and the state is switched to the connected state from the disconnected state;

the release assembly 3 is communicated with the energy accumulator 1, the pressure in the energy accumulator 1 is communicated with the valve opening cavity of the oil cylinder 6 through the normally open stop valve 5 and the one-way valve 7, the weight mechanism on the corresponding valve is lifted, the valve is in a normally open state, a butterfly valve is adopted in the application, the release assembly 3 is triggered by the hydraulic pressure of the speed measuring assembly to start the hydraulic driving device to close the butterfly valve, as long as the flow rate is increased to a set value, the guide plate 211 of the balance weight assembly deflects, the rotating wheel 221 of the piston direct-acting assembly 22 rotates to excite the release assembly 3, namely the stroke reversing valve, so as to start the hydraulic driving device to close the butterfly valve, no extra energy is needed in the whole process, therefore, the pipe explosion protection valve can still reliably work under the condition of power failure, further, the release point of the release assembly 3 is adjustable, the balance weight assembly 21 adjusts the length of the force arm of the balance lever 212, and the piston 66 directly-acting type pretension adjusting spring 227, so as to correspondingly set the flow rate to be limited, which can be adjusted in the calibration curve, and provide the calibration curve when supplying.

More preferably, the oil cylinder 6 and the energy accumulator 1 form a heavy hammer energy accumulation type structure, when the valve is opened, the oil cylinder 6 is driven by the electric motor to open the valve plate and the heavy hammer to the full-open position, the power supply of the motor is 380V/3PH, and the protection grade is IP 68; under the condition of power failure, the valve plate and the heavy hammer can be opened by hydraulic pressure, namely, the valve is driven by a manual hydraulic pump, when pipe explosion occurs, the accumulated energy of the heavy hammer enables the valve to be reliably closed, operation is not needed by any external energy source, the stability is improved, in addition, a regulating valve for regulating the opening and closing time of the valve is arranged in the self-structure, the automatic pressure maintaining or position compensation function is realized, the heavy hammer is ensured not to fall off in the operation process, the operation is simple and convenient, the on-site operation and the valve opening/closing position display can be realized through a field control box, and the remote monitoring and control can also be realized.

Preferably, two speed measuring components, one of which is a balance weight component 21 and the other is a piston linear motion component 22; the two are balanced weight components 21, the two are piston direct-acting components 22, the speed measuring component does not need any external power supply, the speed measuring component is made of stainless steel, two ends of a transmission shaft 216 are stainless steel rolling shaft sleeves, a sealing position adopts a multilayer V-shaped sealing ring, a release component 3 adopts a stroke reversing valve, and an international standard stainless steel element is adopted.

Preferably, the counter weight assembly 21 includes a guide plate 211 and a transmission shaft 216, the transmission shaft 216 is coaxially disposed with the valve plate, the upper end of the guide plate 211 is fixed to the transmission shaft 216, the lower end of the guide plate 211 corresponds to the medium, the upper end of the transmission shaft 216 is provided with a counter lever 212, and one end of the counter lever 212, which is far away from the transmission shaft 216, is provided with a counter weight 214; after the balance lever 212 rotates, a stroke hydraulic valve 213 is triggered, a proximity switch 219 is arranged corresponding to the guide plate 211, and the proximity switch 219 triggers a control system to close the valve; preferably, the balance weight 214 is in threaded connection with the balance lever 212, the number of the balance weights 214 is multiple, and both ends of the balance weights 214 are provided with adjusting and locking nuts 215 for fixing the balance weights 214, the balance weight assembly 21 further comprises a mounting body 217 and a mounting flange 218, the mounting body 217 is connected with the valve housing through the mounting flange 218, and the transmission shaft 216 is rotatably connected with the mounting body 217.

When a medium in the pipeline flows, the medium impacts the guide plate 211, the guide plate 211 is fixed on the transmission shaft 216, the guide plate 211 is subjected to the action of water impact to perform semi-rotation movement, the balance weight 214 lever assembly which is also fixed on the transmission shaft 216 is driven, the balance weight 214 rotates on the lever through threads, the two ends of the balance weight 214 are provided with the fastening nuts 226, the length of a force arm between the balance weight 214 and the lever is adjusted, and the balance of the guide plate 211 can be adjusted. When the medium flow velocity in the pipeline is normal, the force is balanced, when the medium flow velocity exceeds the setting required by people, the guide plate 211 continues to rotate, the balance weight 214 overturns to trigger the stroke hydraulic valve 213, the oil circuit is connected, the valve executes the preset action, meanwhile, the proximity switch 219 also sends an electric signal to control and monitor the electric system, if the electric control system power supply is normal, the electric signal is input into the electric control system, the control box also sends a valve closing command, the electromagnetic valve is also electrified, the electromagnetic valve and the stroke hydraulic valve 213 have double functions, the valve is also closed according to the set first quick and then slow, until the whole structure is completely closed, and the adjustment and the installation of the whole structure are more convenient.

Preferably, the piston translation assembly 22 includes a rotating wheel 221, a wheel carrier 222, a movable rod 223 and a mounting frame 224, the movable rod 223 is disposed in the mounting frame 224 and is coaxial with the mounting frame 224, the movable rod 223 moves up and down relative to the mounting frame 224, a fixed cylinder 225 is disposed outside the movable rod 223 at the upper end of the mounting frame 224, an adjusting screw cap 228 in threaded connection is disposed at the upper end of the fixed cylinder 225, a pre-tightening spring 227 is disposed inside the fixed cylinder 225, the pre-tightening spring 227 is coaxially disposed in the movable rod 223, the pre-tightening spring 227 is disposed between the adjusting screw cap 228 and a positioning table of the movable rod 223, the movable rod 223 extends upward out of the adjusting screw cap 228, and a horizontally extending trigger rod 229 is fixedly disposed;

the lower end of the movable rod 223 is provided with a roller 2231, the lower end of the mounting frame 224 is provided with a rotating wheel 221 which is rotatably connected, the rotating wheel 221 is of a multi-angle raised wheel-shaped structure, a raised part of the rotating wheel 221 is arranged in a tangent manner with the roller 2231, preferably, the lower end of the adjusting screw cap 228 is provided with a fastening nut 226, the fastening nut 226 is in threaded connection with the fixed cylinder 225, the joint of the mounting frame 224 and the pipeline is provided with two sealing rings, and the sealing rings are arranged between the upper end and the lower end of the movable rod 223 and the mounting frame 224.

When a medium in the pipeline flows, the rotating wheel 221 is impacted, the rotating wheel 221 rotates the cutting roller 2231 to drive the movable rod 223 to extend, the upper end of the movable rod 223 is provided with a pre-tightening spring 227 capable of adjusting pre-tightening force, the adjusting screw cap 228 is screwed and unscrewed to compress and release the force of the spring, so that the force balance between the adjusting screw cap 228 and the force of the rotating wheel 221 for cutting the small roller 2231 is achieved, and when the adjusting screw cap 228 reaches a proper position, the screw cap is locked through the tightening nut 226 to prevent setting misoperation.

When the medium flow rate in the pipeline is normal, the pretightening force of the spring is balanced with the cutting force of the rotating wheel 221, when the medium flow rate exceeds the required setting, the rotating wheel 221 continues to rotate, the movable rod 223 extends out to drive the stroke shaft and the trigger rod 229 to touch the stroke hydraulic valve 213, an oil path is connected, the valve executes the preset action, meanwhile, the proximity switch 219 arranged outside also sends an electric signal to control and monitor the electric system, if the power supply of the electric control system is normal, the electric signal is input into the electric control system, the control box also sends a valve closing command, the electromagnetic valve is also electrified, the electromagnetic valve and the stroke hydraulic valve 213 have double functions, and the valve is also closed according to the set speed before and slowly until the full closed position.

The piston direct-acting assembly 22 is bidirectional, a downstream pipeline is broken, and when the flow rate is over-high, the stroke reversing valve is triggered, and the pipe bursting valve is closed; if the upstream pipe is broken, the downstream water overflows reversely, the water flow also impacts the runner 221, when the balance force is damaged, the stroke hydraulic valve 213 is also triggered, and the pipe bursting closing valve is also closed to be fully closed to a set degree from early to late.

Preferably, the oil cylinder 6 is a two-speed hydraulic cylinder, the first section is closed for 75-85 degrees, preferably 80 degrees, the time of 6-10s is closed, preferably 8s is closed, and the second section is closed for 5-15 degrees; preferably 10 degrees, the closing time is 18-22s, preferably 20s, the oil cylinder 6 adopts the heavy-duty standard, and has the advantages of high strength, high output force, adjustable speed angle and speed time, accurate adjustment and no drift.

Preferably, the oil cylinder 6 comprises a cylinder body 61, one end of the cylinder body 61 is provided with a slowly-closed cylinder tail 63, the other end of the cylinder body 61 is provided with a cylinder head 62, a coaxial piston 66 is arranged in the cylinder body 61, the slowly-closed cylinder tail 63 is provided with an oil inlet 64 and an oil inlet one-way valve 7, a hollow rod 67 is further arranged in the slowly-closed cylinder tail 63, the hollow rod 67 penetrates through the slowly-closed cylinder tail 63, a clearance hole 661 is arranged on the piston 66, the hollow rod 67 and the clearance hole 661 are correspondingly arranged, when the oil cylinder 6 is in a closed state, the hollow rod 67 extends into the clearance hole 661, a slow joint flow valve for oil outlet is arranged on the slowly-closed cylinder tail 63, one end, away from the piston 66, of the slowly-closed cylinder tail 63 is provided with a slowly-closed block 68, the slowly-closed block 68 is used for adjusting the length of the hollow rod 67 extending into the piston 66, and the hollow rod 67 is provided with a fast oil through hole 671.

Preferably, an adjusting screw 681 is fixedly arranged on the slow closing block 68, the adjusting screw 681 is in threaded connection with the hollow rod 67, a plug 682 is arranged at one end of the slow closing block 68, which is far away from the hollow rod 67, a plurality of sealing rings are arranged between the hollow rod 67 and the avoiding hole 661, and a plurality of sealing rings are arranged between the piston 66 and the inner wall of the cylinder 61.

In the actual working process, oil of the oil pump pushes the piston 66 to do stretching valve opening movement through the oil inlet 64 and the oil inlet one-way valve 7 until the valve is completely opened and stopped, when the valve is closed, no matter the valve is closed electrically or the valve is closed by the release assembly 3, the oil in the oil cylinder 6 passes through the hollow rod 67 and is quickly discharged into the oil tank through the quick oil through hole 671 through the hollow rod 67, the oil cylinder 6 quickly moves, the valve is quickly closed, and the closing speed can be adjusted through the quick joint flow valve; when the piston 66 of the oil cylinder 6 moves to the position of the hollow rod 67, the central hole of the hollow rod 67 is sealed by a plurality of sealing rings, so that oil in the oil cylinder 6 can only return to the oil tank through the slow joint flow valve and the one-way valve 7, the oil path of the one-way valve 7 is not communicated at the moment, the fast and slow closing angle can be realized through the rotation of the adjusting screw 681, and when the oil cylinder rotates clockwise, the hollow rod 67 is shortened, and the fast closing angle is enlarged; when the adjusting screw 681 rotates counterclockwise, the hollow rod 67 extends, the fast-closing angle is reduced, and the adjustment amount of the fast-closing angle and the slow-closing angle can meet the requirements of customers.

Preferably, the air filter is further included for filtering the air; an oil absorption filter for filtering oil; the oil pump carries out the pumping of oil, in whole control system, guarantees the stability of power supply.

The working principle of the structure is that the flowing of water generates kinetic energy, the flow rate is larger, the kinetic energy is larger, the function and the action of the protector are not influenced by the change of the pressure of the pipeline, the protector is only controlled by the flow rate of a medium in the pipeline, when the flow rate of the medium in the pipeline changes, the force acting on the guide vane or the rotating wheel 221 in the inner section of the pipeline changes, and the stroke hydraulic valve 213 is driven to reverse, so that the real-time monitoring and the feedback of water flow are realized. The structure adopts the double eccentric butterfly valve, the friction of the sealing surface is small, and the double eccentric butterfly valve is horizontally arranged. When the butterfly valve is opened from 0-90 degrees, the sealing surface of the butterfly plate can be separated from the sealing surface of the valve seat immediately at the opening moment, and when the butterfly valve is closed from 90-0 degrees, the sealing surface of the butterfly plate can be contacted and tightly press the valve seat for sealing only at the closing moment. Therefore, no friction exists between the valve seat and the sealing surface on the butterfly plate, the service life of the valve is prolonged, the valve body and the butterfly plate are made of nodular cast iron QT450-10 and are integrally cast by resin sand, and the casting is subjected to heat treatment to eliminate internal stress. Meanwhile, through finite element analysis, the deformation of the valve body and the butterfly plate is controlled within an allowable range, so that the stress distribution is more uniform, the size is more optimized, the butterfly plate has enough strength and rigidity and cannot generate harmful deformation, the butterfly plate adopts a truss structure with small flow resistance and has smaller resistance, the local resistance coefficient of the loss of a water head caused by full opening is less than or equal to 0.2, the noise and cavitation can be effectively reduced, electrochemical corrosion is generated by preventing a medium from immersing into a contact gap between the valve shaft and the butterfly plate, sealing rings are arranged at two ends of the contact position between the valve shaft and the butterfly plate, and the sealing rings are arranged at two ends of the contact position between the conical pin and the butterfly plate to prevent the medium from entering the gap between the contact part between the valve shaft and the butterfly plate to form a micro battery and generate the electrochemical corrosion.

In the actual working process, when a pipeline normally runs, the pressure in the energy accumulator 1 is communicated with a valve opening cavity of the oil cylinder 6 through the normally open stop valve 5 and the one-way valve 7, the heavy hammer mechanism on the valve is lifted, and the valve is in a normally open state; two speed measurement components detect the velocity of flow of medium in the pipeline in real time, in case the pipe explosion takes place, the velocity of flow exceeds the safe value of settlement, release component 3 will react immediately, switches to the switch-on position from the disconnection position, and the pressure of hydro-cylinder 6 is released through release component 3, and the hydraulic circuit among the hydraulic drive device is put through, and the weight whereabouts drives the valve and closes, and release component 3 only receives the control of inside speed measurement component, does not need any external power source, safe and reliable.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (7)

1. Piston direct action type tachymeter, its characterized in that: the movable rod is arranged in the mounting frame and coaxial with the mounting frame, the movable rod moves up and down relative to the mounting frame, a fixed cylinder is arranged outside the upper end of the movable rod, an adjusting screw cap in threaded connection is arranged at the upper end of the fixed cylinder, a pre-tightening spring is arranged inside the fixed cylinder, the pre-tightening spring is coaxially arranged on the movable rod, the pre-tightening spring is arranged between the adjusting screw cap and a positioning table of the movable rod, the movable rod extends upwards out of the adjusting screw cap and is fixedly provided with a horizontally extending trigger rod;

the lower end of the movable rod is provided with a roller, the lower end of the mounting frame is provided with a rotating wheel which is connected in a rotating mode, the rotating wheel is of a wheel-shaped structure with a plurality of corners protruding, and the protruding portion of the rotating wheel is arranged in a tangent mode with the roller.

2. The piston direct-acting velocimeter according to claim 1, characterized in that: the lower extreme of adjusting the spiral shell lid is equipped with tight set nut, tight set nut with solid fixed cylinder threaded connection, the junction of mounting bracket and pipeline is equipped with two sealing washers, the last lower extreme of movable rod with all be equipped with the sealing washer between the mounting bracket.

3. The piston direct-acting velocimeter according to claim 1, characterized in that: the number of the piston direct-acting type velocimeters is two, and the two piston direct-acting type velocimeters are connected in parallel or in series on the medium transmission pipeline.

4. The piston direct-acting velocimeter according to claim 1, characterized in that: the piston direct-acting type velocimeter is provided with a release assembly in series, when the flow rate exceeds a set value, the release assembly is triggered to act, the release assembly is switched to a connected state from a disconnected state, the release assembly is communicated with an energy accumulator, the pressure in the energy accumulator is communicated with a valve opening cavity of an oil cylinder through a normally-open stop valve and a one-way valve, a heavy hammer mechanism on a corresponding valve is lifted, and the valve is in a normally-open state.

5. The piston direct-acting velocimeter according to claim 4, characterized in that: the oil cylinder is a double-speed hydraulic cylinder, the first section is closed at 75-85 degrees, the second section is closed at 5-15 degrees within 6-10 seconds; 18-22s closed.

6. The piston direct-acting velocimeter according to claim 4, characterized in that: the hydro-cylinder includes the cylinder body, the one end of cylinder body is equipped with slowly closes the jar tail, and the other end is equipped with the cylinder head, be equipped with coaxial piston in the cylinder body, slowly close and be equipped with oil inlet and oil feed check valve on the jar tail, slowly close still to be equipped with hollow pole in the jar tail, hollow pole passes slowly close the jar tail setting, be equipped with the hole of keeping away on the piston, hollow pole with keep away the corresponding setting of hole, under the hydro-cylinder off-state, hollow pole stretches into keep away the hole setting, slowly close and be equipped with out oil on the jar tail and use the slow joint flow valve, slowly close the jar tail and keep away from the one end of piston is equipped with slowly to close the piece, slowly close the piece and be used for adjusting the length that hollow pole stretched into the piston.

7. The piston direct-acting velocimeter according to claim 6, characterized in that: the slowly-closed block is fixedly provided with an adjusting screw rod, the adjusting screw rod is in threaded connection with the hollow rod, the slowly-closed block is far away from one end of the hollow rod and is provided with a plug, the hollow rod is provided with a plurality of sealing rings in the middle of the avoiding hole, and the piston is provided with a plurality of sealing rings between the inner walls of the cylinder body.

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