Portable safety valve calibrator

Abstract

The utility model relates to a portable safety valve calibrator which comprises a hydraulic cylinder body, a piston driven by hydraulic pressure, a center rod penetrating through the hydraulic cylinder body and the piston, a pressure sensor and a displacement sensor, the piston comprises a piston body and a piston head, one end of the piston body is arranged in the hydraulic cylinder body and is connected with a hydraulic cavity, and the other end of the piston body is connected with the displacement sensor. The other end of the piston body penetrates out of the hydraulic cylinder body and is fixedly connected with the piston head. The fixed end of the pressure sensor is sleeved and fixed on the central rod, and the movable end of the pressure sensor is fixedly connected with the piston head; the fixed end of the displacement sensor is fixedly connected with the hydraulic cylinder body, and the movable end of the displacement sensor is fixedly connected with the movable end of the pressure sensor. The portable safety valve calibrator solves the problem that in the prior art, a compact safety valve in a narrow working environment cannot be measured due to the fact that the structure is complex and the size is large through a specific compact structure.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valve detection, in particular to a portable safety valve calibrator. Background Art

[0002] For traditional off-line calibration of safety valves, the safety valve needs to be disassembled from the protected equipment, resulting in the shutdown and production suspension of the protected equipment; moreover, the disassembly and installation of the safety valve involve a large amount of work and are time-consuming and laborious. Therefore, the on-line detection method of safety valves is becoming more and more common. However, the existing calibration equipment has a complex structure and a large volume, and cannot measure safety valves in a narrow and compact working environment. Therefore, there is a need for a small, portable, and accurately measuring calibration equipment. Content of the Utility Model

[0003] An embodiment of the utility model provides a portable safety valve calibrator to solve the problem in the prior art that due to the complex structure and large volume, it is impossible to measure safety valves in a narrow and compact working environment.

[0004] To achieve the above object, the embodiment of the utility model provides the following technical solutions:

[0005] A portable safety valve calibrator includes a hydraulic cylinder body, a piston driven by hydraulic pressure, a central rod passing through the hydraulic cylinder body and the piston, a pressure sensor, and a displacement sensor. The piston includes a piston body and a piston head. One end of the piston body is arranged in the hydraulic cylinder body and connected to the hydraulic cavity, and the other end of the piston body passes through the hydraulic cylinder body and is fixedly connected to the piston head; the fixed end of the pressure sensor is sleeved and fixed on the central rod, and the movable end of the pressure sensor is fixedly connected to the piston head; the fixed end of the displacement sensor is fixedly connected to the hydraulic cylinder body, and the movable end of the displacement sensor is fixedly connected to the movable end of the pressure sensor.

[0006] Further, a connection port for connecting with the safety valve is detachably arranged on the hydraulic cylinder body.

[0007] Further, the hydraulic cylinder body includes a guide core and a cylinder body housing. The guide core is sleeved on the central rod. The guide core is provided with a first connecting body arranged non-parallelly, and the first connecting body is fixedly connected to the cylinder body housing. The cylinder body housing is provided with a joint communicating with the hydraulic cavity.

[0008] Further, annular oil seals are arranged on both the inner and outer sides of the piston body, and a convex structure is arranged on the piston body or the hydraulic cylinder body.

[0009] Further, the convex structure is fixed on the piston body by bolts.

[0010] Further, a concave pit with a conical or spherical shape is arranged on one side of the piston body facing the hydraulic cavity.

[0011] Further, one end of the central rod is provided with a connector connected to the valve rod of the safety valve, and the other end of the central rod is provided with a limiting member.

[0012] Further, a displacement sensor bracket is provided on one side of the cylinder block of the hydraulic cylinder. A cavity for placing a displacement sensor and a light channel are provided inside the displacement sensor bracket. A quartz glass cover plate and a second connector fixedly connected to the pressure sensor are provided at the channel opening of the light channel.

[0013] Further, the pressure sensor includes a fixing body sleeved on the central rod and a mating body fixedly connected to the piston. A plurality of deformable beams are provided between the fixing body and the mating body. Strain gauges are provided on the deformable beams, and the strain gauges are connected to a signal acquisition module.

[0014] Further, the thickness of the mating body is greater than the thickness of the fixing body.

[0015] The embodiment of the present utility model has the following advantages:

[0016] The portable safety valve calibrator provided by the present utility model includes a cylinder block of a hydraulic cylinder, a piston driven by hydraulic pressure, a central rod passing through the cylinder block of the hydraulic cylinder and the piston, a pressure sensor and a displacement sensor. It solves the problem in the prior art that due to the complex structure and large volume, it is impossible to measure the safety valve in a narrow and compact working environment through a specific compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0018] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions that the present utility model can implement. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover.

[0019] Figure 1 It is a working state diagram of a portable safety valve calibrator provided by an embodiment of the present utility model;

[0020] Figure 2A cross-sectional view of a portable safety valve calibrator provided by an embodiment of the present utility model;

[0021] Figure 3 It is Figure 2 The structural diagram of the pressure sensor in the middle.

[0022] In the figure:

[0023] 1. Central rod; 2. Hydraulic cylinder body; 3. Piston; 4. Pressure sensor; 5. Displacement sensor; 6. Connector; 7. Limiting member; 8. Guide core; 9. Cylinder body housing; 10. First connecting body; 11. Joint; 12. Piston body; 13. Piston head; 14. Annular oil seal; 15. Protruding structure; 16. Connection port; 17. Connection port bracket; 18. Bottom port; 19. Fixed body; 20. Fitting body; 21. Deformable beam; 22. Safety valve; 23. Displacement sensor bracket; 24. Light channel; 25. Quartz glass cover plate; 26. Second connecting body. Specific embodiments

[0024] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] As Figure 1-2 shown, a portable safety valve calibrator includes a hydraulic cylinder body 2, a piston 3 driven by hydraulic pressure, a central rod 1 passing through the hydraulic cylinder body 2 and the piston 3, a pressure sensor 4, and a displacement sensor 5. One end of the central rod 1 is provided with a connector 6 connected to the valve stem of the safety valve 22, and the other end of the central rod 1 is provided with a limiting member 7. In this embodiment, the limiting member 7 is a nut, which is used to adjust the effective length of the central rod 1 so that the central rod 1 has a certain up and down movement distance.

[0026] The hydraulic cylinder block 2 includes a guiding core 8 and a cylinder block housing 9. The cylinder block housing 9 is sleeved outside the guiding core 8. After the guiding core 8 and the cylinder block housing 9 are connected, a hydraulic chamber is formed inside. The guiding core 8 is sleeved on the central rod 1, and there is a clearance connection between the guiding core 8 and the central rod 1, enabling the central rod 1 to move up and down within the guiding core 8. The guiding core 8 is provided with a first connecting body 10 which is not arranged in parallel. In this embodiment, the first connecting body 10 is perpendicular to the guiding core 8. The first connecting body 10 is fixedly connected to the cylinder block housing 9, facilitating the disassembly and assembly between the guiding core 8 and the cylinder block housing 9, and the parts are convenient for production and processing. The two are detachably connected by fasteners. The cylinder block housing 9 is provided with a joint 11 communicating with the hydraulic chamber. In this embodiment, the joint 11 is a flat joint 11 for connecting an external hydraulic source device.

[0027] The piston 3 includes a piston body 12 and a piston head 13. One end of the piston body 12 is arranged inside the hydraulic cylinder block 2 and connected to the hydraulic chamber. The other end of the piston body 12 passes through the hydraulic cylinder block 2 and is fixedly connected to the piston head 13. When liquid enters the hydraulic chamber, it will lift the piston body 12, and the piston body 12 drives the piston head 13 to rise. Conversely, when the liquid flows out, the piston body 12 drives the piston head 13 to descend. Annular oil seals 14 are provided on both the inner and outer sides of the piston body 12 to seal the gaps between both the inner and outer sides of the piston body 12 and the hydraulic cylinder block 2.

[0028] A convex structure 15 is provided on the piston body 12 or the hydraulic cylinder block 2 to have a certain space between the piston body 12 and the hydraulic cylinder block 2, thereby forming an initial hydraulic chamber, facilitating the liquid to fill the bottom surface of the piston body 12 and forming a uniform lifting force on the piston body 12. A number of uniformly distributed concave pits of a conical or spherical shape are provided on the side of the piston body 12 facing the hydraulic chamber, facilitating the aggregation of the liquid and forming a concentrated upward lifting force. The convex structure 15 is preferably arranged on the inner side of the hydraulic chamber, that is, the side close to the guiding core 8, so that the convex structure 15 does not need to be drilled and will not block the liquid. The convex structure 15 is fixed to the piston body 12 by bolts, which is convenient for the production and installation of the parts. Moreover, the end face of the bolt is provided with a cross or a straight groove, and can be designed as a concave pit with a spherical or conical shape in the middle and a cross or a straight shape on the outside, thereby enhancing the lifting force of the liquid.

[0029] A connection port 16 for detachably connecting to the safety valve 22 is provided on the hydraulic cylinder block 2. The detachable connection port 16 is used to match the interfaces of safety valves 22 of different specifications. Specifically, the connection port 16 can be divided into a connection port frame 17 for adjusting the size and depth of the connection port 16, and a bottom port 18 for adjusting the thread or buckle of the connection port 16. This structure is convenient for processing and installation, and can be flexibly matched to cope with various safety valves 22.

[0030] The fixed end of the pressure sensor 4 is sleeved and fixed on the central rod 1, and the movable end of the pressure sensor 4 is fixedly connected to the piston head 13. Specifically, as Figure 3 shown, the pressure sensor 4 includes a fixed body 19 sleeved on the central rod 1 and a mating body 20 fixedly connected to the piston 3. A number of deformable beams 21 are provided between the fixed body 19 and the mating body 20. Strain gauges are provided on the deformable beams 21, and the strain gauges are connected to a signal acquisition module. The thickness of the mating body 20 is greater than the thickness of the fixed body 19, and this thickness difference is slightly greater than the upward movement distance of the piston 3.

[0031] The fixed end of the displacement sensor 5 is fixedly connected to the cylinder block 2 of the hydraulic cylinder, and the movable end of the displacement sensor 5 is fixedly connected to the movable end of the pressure sensor 4. In this embodiment, an optoelectronic displacement sensor 5 is adopted. A displacement sensor bracket 23 is provided on one side of the cylinder block 2 of the hydraulic cylinder. A cavity for placing the displacement sensor 5 and a light channel 24 are provided in the displacement sensor bracket 23. A quartz glass cover plate 25 and a second connecting body 26 fixedly connected to the pressure sensor 4 are provided at the channel opening of the light channel 24.

[0032] In specific operation, the portable safety valve 22 calibrator of this embodiment is installed on the safety valve 22 to be calibrated. The central rod 1 is connected to the valve stem of the safety valve 22 through a connector 6. The pipeline connection joint 11 of the hydraulic pump is connected. The hydraulic pump is started, and the liquid flows into the cylinder block 2 of the hydraulic cylinder. The liquid jacks up the piston 3, driving the mating body 20 of the pressure sensor 4 to rise. The thrust is transmitted to the central rod 1, and the central rod 1 pulls up the valve stem. At the same time, the central rod 1 pulls the pressure sensor 4 in the opposite direction, enabling the pressure sensor 4 to measure the change in tensile force. When the pressure sensor 4 rises, it drives the second connecting body 26 to rise. The second connecting body 26 drives the quartz glass cover plate 25 to rise, extending the length of the light channel 24 to realize the measurement of displacement. The oil cylinder rises slowly. After hearing the continuous discharge sound of the safety valve 22 to be calibrated, the hydraulic pump is depressurized. The system collects the real-time pressure data of the pressure sensor 4 and the real-time displacement change of the displacement sensor 5 to complete one calibration.

[0033] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A portable safety valve calibrator, characterized in that: It includes a hydraulic cylinder body, a piston driven by hydraulic pressure, a center rod penetrating the hydraulic cylinder body and the piston, a pressure sensor and a displacement sensor, wherein the piston includes a piston body and a piston head, one end of the piston body is arranged in the hydraulic cylinder body and connected to the hydraulic cavity, and the other end of the piston body passes through the hydraulic cylinder body and is fixedly connected to the piston head; The fixed end of the pressure sensor is sleeved and fixed on the central rod, and the movable end of the pressure sensor is fixedly connected to the piston head; The fixed end of the displacement sensor is fixedly connected to the hydraulic cylinder body, and the movable end of the displacement sensor is fixedly connected to the movable end of the pressure sensor.

2. A portable safety valve tester according to claim 1, characterized in that: The hydraulic cylinder body is detachably provided with a connection port for connecting with a safety valve.

3. A portable safety valve tester according to claim 1, characterized in that: The hydraulic cylinder body comprises a guide core and a cylinder body shell. The guide core is sleeved on the center rod. The guide core is provided with a first connector which is not arranged in parallel. The first connector is fixedly connected to the cylinder body shell. The cylinder body shell is provided with a joint which is connected to the hydraulic chamber.

4. A portable safety valve tester according to claim 1, characterized in that: Annular oil seals are arranged on both the inner and outer sides of the piston body, and a convex structure is arranged on the piston body or the hydraulic cylinder body.

5. A portable safety valve tester according to claim 4, characterized in that: The protruding structure is fixed on the piston body by bolts.

6. A portable safety valve tester according to claim 1, characterized in that: A conical or spherical pit is arranged on the side of the piston body facing the hydraulic chamber.

7. A portable safety valve tester according to claim 1, characterized in that: One end of the center rod is provided with a connector connected to the valve stem of the safety valve, and the other end of the center rod is provided with a limit piece.

8. A portable safety valve tester according to claim 1, characterized in that: A displacement sensor frame is provided on one side of the hydraulic cylinder body, and a cavity for placing the displacement sensor and a light channel are provided in the displacement sensor frame. A quartz glass cover plate and a second connector fixedly connected to the pressure sensor are provided at the channel opening of the light channel.

9. A portable safety valve tester according to claim 1, characterized in that: The pressure sensor comprises a fixed body sleeved on the central rod and a matching body fixedly connected to the piston, a plurality of deformable beams are arranged between the fixed body and the matching body, strain gauges are arranged on the deformable beams, and the strain gauges are connected to the signal acquisition module.

10. A portable safety valve tester according to claim 9, characterized in that: The thickness of the matching body is greater than the thickness of the fixing body.

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