Pressure instrument verification equipment

Abstract

The invention discloses pressure instrument verification equipment which comprises a base, a piston component, a lever component and a pressure regulating component. The piston component comprises a first barrel, a first piston and a piston rod, the first barrel is vertically arranged on the base, the first piston is in sliding sealing connection with the first barrel, the lower end of the first piston is hinged to the upper end of the piston rod, the lower end of the piston rod vertically extends downwards, and the upper end of the first barrel communicates with a standard meter and a mounting part; the lever component comprises a horizontally-arranged lever, one end of the lever is fixedly connected with the lower end of the piston rod, the other end of the lever is provided with a pressure applying assembly, a first sliding block is arranged on the lever in a sliding mode, an adjusting assembly is arranged on the base, the first sliding block is hinged to the base through the adjusting assembly, and the pressure adjusting component is communicated with the upper end of the first barrel. The invention aims to solve the technical problem that a series of adverse effects are caused by changing the weight of a weight and the size of a first piston when high-pressure or low-pressure verification is carried out on existing equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of instrument verification, and specifically relates to a pressure instrument verification device. Background Art

[0002] The core principle of pressure gauge verification is to compare the indication values of a high-precision standard pressure source and the pressure gauge to be verified, and combine environmental compensation and error analysis to ensure the measurement accuracy of the measured instrument.

[0003] Among them, Pascal's principle is that in a closed gas, pressure is evenly transmitted in all directions. The verification system applies a known pressure through a pressure pump or weights, and uses the gas to transmit to the pressure gauge to be verified and the standard gauge to achieve synchronous measurement of the pressure value. The most common instrument using Pascal's principle for measurement is the piston pressure gauge. The piston pressure gauge applies pressure to the piston by adding weights to the weight tray, and obtains the corresponding pressure according to the pressure equal to the pressure divided by the cross-sectional area of the piston.

[0004] However, the piston pressure gauge has the following defects when in use: ①. When performing low-pressure verification, it is necessary to overall consider the relationship between the piston area and the weight mass.

[0005] One is that when the weight mass is determined and the piston area is increased, the piston diameter will inevitably increase, resulting in a significant increase in the volume and self-weight of the equipment, which is not convenient for carrying and transferring. At the same time, the increase in the piston area will increase the possibility of fluid leakage, and the low-pressure system is extremely sensitive to leakage. A small leakage amount will cause a rapid pressure decay, making it difficult to stably control the measurement process; The other is that when the piston area remains unchanged and smaller-mass weights are used, although it can alleviate the equipment volume and sealing problems, the too-small weight mass not only increases the difficulty of taking and placing, but also magnifies the environmental interference factors and directly affects the detection accuracy.

[0006] ②. When performing high-pressure range verification, it is also necessary to overall consider the relationship between the piston area and the weight mass.

[0007] One is that when the piston area remains unchanged, a large pressure needs to be applied to the piston. The large pressure will inevitably increase the weight of the weights. The extra-large mass weights not only increase the operation difficulty, but also make the equipment bear a large pressure. Long-term exposure to a large pressure will cause fatigue damage to the key components. For example, the long-term pressure on the frame will cause deformation, thus affecting the measurement accuracy and stability; The other is that when the weight mass is determined and the piston diameter is reduced, this puts extremely high requirements on the manufacturing process of the piston, directly pushing up the equipment R & D and production costs. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a pressure gauge calibration device to solve the technical problems of a series of adverse effects brought about by changing the weight of the weights and the size of the first piston when the existing device performs high-pressure or low-pressure calibrations.

[0009] To achieve the foregoing invention purpose, the technical solution adopted by the present invention includes: a pressure gauge calibration device, comprising: A base; A piston component, the piston component includes a first cylinder body, a first piston and a piston rod. The first cylinder body is a hollow cylindrical structure with one end open. The first cylinder body is vertically arranged on the base with the open end facing downwards. The first piston is located inside the first cylinder body and is slidably and sealingly connected to the first cylinder body along the length direction of the first cylinder body. The lower end of the first piston is hinged to the upper end of the piston rod. The lower end of the piston rod extends vertically downwards. The upper end of the first cylinder body is communicated with a standard gauge and an installation part for installing the gauge to be inspected; A lever component, the lever component includes a horizontally arranged lever. One end of the lever is fixedly connected to the lower end of the piston rod. The other end of the lever is provided with a pressing component. A first slider is slidably arranged on the lever. The first slider can slide along the length direction of the lever. An adjusting component is arranged on the base. The first slider is hinged to the base through the adjusting component. By means of the adjusting component, the position of the first slider on the lever can be changed, thereby changing the fulcrum of the lever; A pressure regulating component, which is communicated with the upper end of the first cylinder body and is used to regulate the pressure inside the first cylinder body.

[0010] Compared with the prior art, the advantages of the present invention include: (1) For the pressure gauge calibration device provided by the present invention, when performing low-pressure calibration, by adjusting the component to change the position of the first slider on the lever, thereby changing the fulcrum of the lever (that is, by adjusting the component to make the first slider slide towards the pressing component direction), according to the lever principle, the force applied to the first piston can be correspondingly reduced, and the closer the first slider is to the pressing component, the smaller the force applied to the first piston; With such a setting, when the mass of the weights is determined, there is no need to increase the area of the first piston, so that the volume and self-weight of the device can be maintained in a more appropriate situation, which is convenient for carrying and transferring. In addition, it also reduces the possibility of fluid leakage due to the increase in the area of the first piston (since the contact area between the first piston and the inner wall of the first cylinder body increases, the increase in the contact area will increase the possibility of leakage). The reduction of the leakage amount reduces the possibility of rapid pressure decay and can better control the measurement process; When the area of the first piston remains unchanged, there is no need to use weights with smaller masses, thereby reducing the difficulty of taking and placing the weights. In addition, it also reduces the possibility of being interfered by environmental factors due to the use of weights with smaller masses and improves the detection accuracy.

[0011] (2) A pressure gauge calibration device provided by the present invention, when performing high-pressure calibration, changes the position of the first slider on the lever through the adjustment assembly, and then changes the fulcrum of the lever (that is, makes the first slider slide towards the first cylinder through the adjustment assembly). According to the lever principle, the force applied to the first piston can be correspondingly increased, and the closer the first slider is to the first cylinder, the greater the force applied to the first piston; When the area of the first piston remains unchanged, a large pressure can be applied to the first piston without a large mass of weights, reducing the operation difficulty caused by using ultra-large mass weights. At the same time, it also reduces the possibility of fatigue damage to key components due to the large mass of weights causing the equipment to bear a large pressure, improving the measurement accuracy and stability; When the mass of the weights is determined, it is not necessary to reduce the diameter of the first piston to obtain a large pressure, thereby reducing the manufacturing process requirements for the first piston and further reducing the equipment R & D and production costs.

[0012] (3) A pressure gauge calibration device provided by the present invention, during the process of measuring pressure increase or decrease, at least five calibration points need to be evenly selected within the range of the measuring range. Each calibration point has five different positions on the lever, that is, calibration positions, and the distances between the calibration positions can be calculated through the lever principle (after determining the distances, the specific positions on the lever are measured with a measuring scale). When the adjustment assembly controls the first slider to slide, it will pass through each calibration position. When the first slider moves to the corresponding calibration position (subsequently, the lever is kept horizontal by the pressure regulating component), comparing the standard gauge and the gauge to be calibrated can achieve pressure calibration at five calibration points within the measuring range, and the operation is relatively convenient.

[0013] Further, the adjustment assembly includes a second slider and a first lead screw. The second slider is rotationally connected to the first slider. The second slider is sleeved on the first lead screw and is threadedly connected to the first lead screw. The first lead screw is rotationally connected to the base.

[0014] Further, a spirit level is provided on the lever, and the spirit level is arranged along the length direction of the lever.

[0015] Further, scale lines are provided on the lever, and the scale lines are arranged along the length direction of the lever.

[0016] Further, limiting blocks are arranged on both sides of the first slider. Both limiting blocks are slidably arranged on the lever along the length direction of the lever. The position between the two limiting blocks is the sliding range of the first slider. Locking members for fixing the limiting blocks to the lever are provided on both limiting blocks.

[0017] Further, a locking component for restricting the rotation of the first slider relative to the second slider is provided on the base.

[0018] Further, the pressure regulating component includes a pressure relief component and a pressure boosting component. The pressure relief component includes a pressure relief member, a pressure relief pipe, and a pressure relief valve installed on the pressure relief pipe. A pressure relief port communicating with the inside of the first cylinder is provided on the outer side wall of the upper end of the first cylinder. The pressure relief port is communicated with one end of the pressure relief pipe, and the other end of the pressure relief pipe is communicated with the pressure relief member; The increasing component includes a pressure boosting member, a pressure boosting pipe, and a pressure boosting valve provided on the pressure boosting pipe. A pressure boosting port communicating with the inside of the first cylinder is provided on the outer side wall of the upper end of the first cylinder. The pressure boosting port is communicated with one end of the pressure boosting pipe, and the other end of the pressure boosting pipe is communicated with the pressure boosting member. The pressure boosting port is located below the pressure relief port; A sealing block is provided inside the first cylinder. The sealing block is located above the first piston and is fixedly connected to the first piston. The sealing block is used to seal the pressure boosting port and the pressure relief port. After the sealing block moves upward by a first distance, the pressure boosting port can be communicated with the inside of the first cylinder. After the sealing block moves downward by a second distance, the pressure relief port can be communicated with the inside of the first cylinder; The pressure regulating component further includes a fine-tuning component for regulating the pressure inside the first cylinder. The fine-tuning component is communicated with the upper end of the first cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Structural schematic of the embodiment of the present invention Figure 1 ; Figure 2 For Figure 1 the sectional structural schematic diagram; Figure 3 Structural schematic of the embodiment of the present invention Figure 2 ; Figure 4 Structural schematic of the embodiment of the present invention Figure 3 ; Figure 5 For Figure 4 the sectional structural schematic Figure 1 ; Figure 6 For Figure 4 the sectional structural schematic Figure 2 .

[0021] Reference numerals: Base 1, first cylinder 2, first piston 3, piston rod 4, standard gauge 5, gauge to be inspected 6, lever 7, weight rod 8, weights 9, first slider 10, second slider 11, first lead screw 12, level 13, scale line 14, limit block 15, locking member 16, rotating shaft 17, U-shaped plug 18, plug rod 19, pressure relief pipe 20, pressure relief valve 21, pressure relief port 22, pressurizing member 23, pressurizing pipe 24, pressurizing valve 25, pressurizing port 26, sealing block 27, second cylinder 28, second piston 29, second lead screw 30, clamping block 31. Detailed implementation manners

[0022] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process and principle, etc. in combination with the drawings in the embodiments of the present application and specific implementation cases.

[0023] It should be noted that the embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as a limitation to the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, the present invention covers any substitution, modification, equivalent method and solution made on the spirit, principle and scope defined by the claims of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] In the description of the present application, terms such as "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" and the like do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "comprising" or "including" and the like mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0025] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, when using position terms such as both sides, outer side, upper and lower, etc., it should be understood that they are only used for easy understanding and description, considering that the structure may be facing other positions.

[0026] In the description of the present application, unless otherwise clearly specified and defined, the technical terms or scientific terms used should have the ordinary meaning understood by those with ordinary skills in the field to which the present application belongs. Terms such as "installation", "connection", "linkage", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a contact connection or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] Please refer to Figures 1-6 , the present invention provides a technical solution: a pressure gauge calibration device, including: a base 1, a piston component, a lever component, and a pressure regulating component. The base 1 serves as the installation foundation for the entire device to install various components.

[0028] Refer to Figure 2 and 5 , the piston component includes a first cylinder body 2, a first piston 3, and a piston rod 4. The first cylinder body 2 is a hollow cylindrical structure with one end open. The first cylinder body 2 is vertically arranged on the base 1 with the open end facing downwards. Specifically, the first cylinder body 2 is fixed to the base 1 by welding. The first piston 3 is located inside the first cylinder body 2 and is slidably and sealingly connected to the first cylinder body 2 along the length direction of the first cylinder body 2. The first piston 3 can slide inside the first cylinder body 2 correspondingly according to the pressure applied to the first piston 3. For example, when the pressure is increased, the first piston 3 moves towards the top of the first cylinder body 2 and compresses the internal space of the first cylinder body 2. Then, when the pressure is decreased, the first piston 3 moves towards the bottom of the first cylinder body 2 and the internal space of the first cylinder body 2 expands. The lower end of the first piston 3 is hinged to the upper end of the piston rod 4, and the piston rod 4 can rotate relative to the first piston 3. The lower end of the piston rod 4 extends vertically downwards.

[0029] The upper end of the first cylinder body 2 is connected to a standard meter 5. The standard meter 5 serves as a reference benchmark and is used to compare with the meter under test 6 to check whether the difference in readings is within the specified range, so as to determine whether the meter under test 6 meets the requirements. The upper end of the first cylinder body 2 is connected to an installation part for installing the meter under test 6. In this embodiment, the installation part is an installation pipe that is internally connected to the upper end of the first cylinder body 2. One end of the installation pipe is connected to the upper end of the first cylinder body 2, and the other end is connected to the meter under test 6. The meter under test 6 and the standard meter 5 are arranged in parallel. The reason is the uniform static pressure exerted by the pressure on the gas. When the meter under test 6 and the standard meter 5 are connected in parallel to the same pressure interface, they are in the same pressure environment and directly sense the same pressure value.

[0030] The lever component includes a horizontally arranged lever 7. One end of the lever 7 is fixedly connected to the lower end of the piston rod 4. When the lever 7 is in a horizontal state, the lever 7 is perpendicular to the piston rod 4. The other end of the lever 7 is provided with a pressure application component. Specifically, the pressure application component includes a weight rod 8 and a weight 9. One end of the weight rod 8 is fixedly connected to the end of the lever 7 away from the piston rod 4, and the other end extends vertically upward through the base 1. The weight 9 is detachably connected to the weight rod 8. The weight rod 8 and the lever 7 are perpendicular to each other. When the lever 7 is horizontal, the gravity of the weight 9 is equal to the pressure exerted on the lever 7. Additionally, it should be noted that when the lever 7 is horizontal, the gravity of the first piston 3 should be equal to the sum of the gravities of the weight 9, the piston rod 4, the first piston 3, and the weight rod 8. When calculating the pressure, the pressure generated by relying on the gravities of the weight rod 8, the first piston 3, and the piston rod 4 should be removed. In addition to the above settings, the pressure application component can also apply pressure to the lever 7 by using an elastic component to apply elastic pressure. The pressure of the elastic component can be calculated and determined by measuring the compression amount of the elastic component and according to Hooke's law.

[0031] Refer to Figure 2 and 3 , a first slider 10 is slidably arranged on the lever 7. The first slider 10 can slide along the length direction of the lever 7. Specifically, a slide rail is arranged on the lever 7 along the length direction, and the slider is slidably arranged on the slide rail and can slide along the length direction of the slide rail. (In this embodiment, the slide rail is a chute, the chute extends along the length direction of the lever 7, and the slider is located in the chute and can slide along the length direction of the chute).

[0032] Refer to Figure 1 , an adjustment component is arranged on the base 1. The first slider 10 is hinged to the base 1 through the adjustment component. By means of the adjustment component, the position of the first slider 10 on the lever 7 can be changed, thereby changing the fulcrum of the lever 7. According to the lever principle, when the lever 7 is in balance, the moments of the power (applied force) and the resistance (load force) acting on the lever 7 are equal, that is, the power multiplied by the power arm is equal to the resistance multiplied by the resistance arm. After the fulcrum of the lever 7 changes, when the applied pressure is the same, the pressure acting on the first piston 3 will change accordingly.

[0033] When performing low-pressure calibration, the position of the first slider 10 on the lever 7 is changed by the adjustment assembly, thereby changing the fulcrum of the lever 7 (that is, the first slider 10 is slid towards the pressure application assembly by the adjustment assembly). According to the lever principle, the force applied to the first piston 3 can be correspondingly reduced, and the closer the first slider 10 is to the pressure application assembly, the smaller the force applied to the first piston 3.

[0034] With such a setting, when the mass of the weight 9 is determined, there is no need to increase the area of the first piston 3, so that the volume and self-weight of the device can be maintained in a more appropriate situation, which is convenient for carrying and transferring; in addition, it also reduces the possibility of increased fluid leakage due to the increase in the area of the first piston 3 (since the contact area between the first piston 3 and the inner wall of the first cylinder 2 increases, and the increase in the contact area will increase the possibility of leakage). The reduction of the leakage amount reduces the possibility of rapid pressure decay, and can better control the measurement process.

[0035] When the area of the first piston 3 remains unchanged, there is no need to use weights 9 with smaller masses, thereby reducing the difficulty of taking and placing the weights 9. In addition, it also reduces the possibility of being interfered by environmental factors (such as air buoyancy, electrostatic adsorption, etc.) due to the use of weights 9 with smaller masses, and improves the detection accuracy.

[0036] When performing high-pressure calibration, the position of the first slider 10 on the lever 7 is changed by the adjustment assembly, thereby changing the fulcrum of the lever 7 (that is, the first slider 10 is slid towards the first cylinder 2 by the adjustment assembly). According to the lever principle, the force applied to the first piston 3 can be correspondingly increased, and the closer the first slider 10 is to the first cylinder 2, the greater the force applied to the first piston 3.

[0037] When the area of the first piston 3 remains unchanged, a large pressure can be applied to the first piston 3 without a large mass of the weight 9, which reduces the operation difficulty caused by using an extremely large mass weight 9, and also reduces the possibility of fatigue damage to key components due to the large pressure borne by the device caused by the large mass weight. The measurement accuracy and stability are improved; When the mass of the weight 9 is determined, there is no need to obtain a large pressure by reducing the diameter of the first piston 3, thereby reducing the manufacturing process requirements for the first piston 3, and further reducing the device R & D and production costs.

[0038] In summary, without changing the weight of the weight 9 and the size of the first piston 3, by changing the fulcrum of the lever 7 through the adjustment assembly, the calibration of the high-pressure meter to be tested and the calibration of the low-pressure meter to be tested can be achieved, and the practicability is strong; In addition, according to JJG 52-2013 Verification Regulation of General Pressure Gauges, Pressure Vacuum Gauges and Vacuum Gauges with Elastic Elements, during the process of measuring while increasing or decreasing the pressure, at least five calibration points should be evenly selected within the range of the measuring capacity. Each calibration point corresponds to five different positions on the lever 7, namely the calibration positions. And the distances between the calibration positions can be calculated through the lever principle (after determining the distances, the specific positions on the lever 7 are measured with a measuring scale). When the adjusting assembly controls the sliding of the first slider 10, it will pass through each calibration position. When the first slider 10 moves to the corresponding calibration position (subsequently, the lever 7 is kept horizontal by the pressure regulating component), by comparing the standard gauge 5 and the gauge to be calibrated 6, the pressure calibration can be realized at five calibration points within the range of the measuring capacity, and the operation is relatively convenient.

[0039] The pressure regulating component is connected to the upper end of the first cylinder 2 and is used to adjust the internal pressure of the first cylinder 2. After the pressure applying assembly applies or reduces a certain pressure to the lever 7, the balance state of the lever 7 will be broken. By increasing or reducing the gas in the first cylinder 2 through the pressure regulating component, the lever 7 can resume its balance state (i.e., the lever 7 is in a horizontal state). Subsequently, the verification of the gauge to be calibrated 6 is realized by comparing the standard gauge 5 and the gauge to be calibrated 6.

[0040] Refer to Figure 1 Or 3, in this embodiment: The adjusting assembly includes a second slider 11 and a first lead screw 12. The second slider 11 is rotatably connected to the first slider 10, that is, the rotation connection point of the second slider 11 and the first slider 10 is the fulcrum of the lever 7. The movement of the second slider 11 will drive the movement of the first slider 10, thereby changing the fulcrum of the lever 7. The second slider 11 is sleeved on the first lead screw 12 and is connected to the first lead screw 12 through a threaded fit. The first lead screw 12 is rotatably connected to the base 1. By rotating the first lead screw 12, the second slider 11 can move on the first lead screw 12, finally realizing the change of the fulcrum of the lever 7. At the same time, the self-locking function of the thread will enable the second slider 11 to be relatively stably fixed on the first lead screw 12 after moving to maintain the stability of the fulcrum of the lever 7.

[0041] Refer to Figure 1 And 2 , in this embodiment: In order to be able to more intuitively and accurately judge whether the lever 7 is in a horizontal state, a spirit level 13 is provided on the lever 7, and the spirit level 13 is arranged along the length direction of the lever 7.

[0042] Refer to Figure 1 And 2 , in this embodiment: In order to better measure the position of the fulcrum of the lever 7, the lever 7 is provided with graduation lines 14, and the graduation lines 14 are arranged along the length direction of the lever 7.

[0043] Refer to Figure 1 And2 In this embodiment, limit blocks 15 are arranged on both sides of the first slider 10. The two limit blocks 15 are slidably arranged on the lever 7 along the length direction of the lever 7. The position between the two limit blocks 15 is the sliding range of the first slider 10. Correspondingly, the sliding range of the first slider 10 is the range of the measuring range of the meter under test 6. Locking members 16 for fixing the limit blocks 15 to the lever 7 are arranged on the two limit blocks 15. Specifically, the locking member 16 is a locking bolt threadedly arranged on the limit block 15. The limit block 15 can be fixed to the lever 7 by rotating the locking bolt.

[0044] During use, first, the mass of the weight 9 and the initial position of the fulcrum of the lever 7 are used to pre-determine the pressure applied to the first piston 3. Then, according to the measuring range of the meter under test 6, a specific pressure range is determined. Correspondingly, the initial measuring point and the terminal measuring point of the measuring range of the meter under test 6 are determined. The two limit blocks 15 are slid to the corresponding positions and fixed respectively by the two locking members 16. Finally, the sliding range of the first slider 10 is determined. On the premise of the same weight mass, the pressure range applied to the first piston 3 is determined, so that the pressure inside the first cylinder 2 will not exceed the range of the meter under test 6, reducing the damage to the meter under test 6 caused by the pressure inside the first cylinder 2 exceeding the measuring range of the meter under test 6.

[0045] Refer to Figure 3 In this embodiment, a locking assembly for restricting the rotation of the first slider 10 relative to the second slider 11 is arranged on the base 1. Specifically, a rotating shaft 17 is fixed on the first slider 10. The rotating shaft 17 is rotatably connected to the second slider 11. A clamping block 31 is arranged on the rotating shaft 17. The locking assembly includes a U-shaped plug 18 and a plug rod 19. The plug rod 19 is fixedly connected to the side of the U-shaped plug 18 facing away from the notch. The plug rod 19 is movably arranged on the base 1. During the movement of the plug rod 19, the U-shaped plug 18 can be inserted outside the clamping block 31 to restrict the rotation of the clamping block 31.

[0046] In use, first adjust the lever 7 to a horizontal state. Then move the plug rod 19 to firmly insert the U-shaped plug 18 into the block 31, thereby restricting the rotation of the block 31 and fixing the rotating shaft 17 to prevent it from rotating. At this time, the lever 7 is in a balanced state. By adding or subtracting weights 9 or adjusting the position of the fulcrum of the lever 7 through the adjusting assembly in two ways, the pressure applied to the first piston 3 can be adjusted. During the pressure adjustment process, since the lever 7 is locked, although the first piston 3 bears the pressure change, it remains stationary, and the pressure inside the first cylinder 2 remains unchanged. When it is necessary to simulate a sudden pressure change, quickly pull the plug rod 19 to separate the U-shaped plug 18 from the block 31. At the moment of unlocking, the lever 7 system loses its restraint, and the first piston 3 immediately responds to the pressure change and generates a displacement, resulting in a step-like mutation in the pressure inside the first cylinder 2. This instantaneous pressure change can reproduce the stress state of the meter under test 6 under instantaneous pressure, effectively expanding the calibration range of the device and significantly enhancing its practicability. In addition, by adjusting the position of the fulcrum of the lever 7 through the adjusting assembly, the pressure applied to the first piston 3 can be changed to simulate different amplitudes of sudden pressure changes. This design enables the device to comprehensively evaluate the performance of the meter under test 6 under various transient pressure shocks, further improving the comprehensive test ability of the device.

[0047] Refer to Figure 1 、 5 Or 6. In this embodiment, the pressure regulating component includes a pressure relief component and a pressure increasing component. The pressure relief component includes a pressure relief member, a pressure relief pipe 20, and a pressure relief valve 21 installed on the pressure relief pipe 20. A pressure relief port 22 communicating with the inside of the first cylinder 2 is provided on the outer side wall of the upper end of the first cylinder 2. The pressure relief port 22 is communicated with one end of the pressure relief pipe 20, and the other end of the pressure relief pipe 20 is communicated with the pressure relief member. Opening the pressure relief valve 21 and the pressure relief member can extract the gas inside the first cylinder 2 to reduce the pressure inside the first cylinder 2. The pressure relief member can be a structure such as an exhaust pump that extracts gas from the container.

[0048] Refer to Figure 1 、 5 Or 6. The pressure increasing component includes a pressure increasing member 23, a pressure increasing pipe 24, and a pressure increasing valve 25 provided on the pressure increasing pipe 24. A pressure increasing port 26 communicating with the inside of the first cylinder 2 is provided on the outer side wall of the upper end of the first cylinder 2. The pressure increasing port 26 is communicated with one end of the pressure increasing pipe 24, and the other end of the pressure increasing pipe 24 is communicated with the pressure increasing member 23. The pressure increasing port 26 is located below the pressure relief port 22. The pressure increasing member 23 conveys gas into the first cylinder 2 through the pressure increasing pipe 24 and the pressure increasing port 26 to increase the pressure inside the first cylinder 2. The pressure increasing member 23 can be a structure such as an air pump that fills gas into the container.

[0049] Inside the first cylinder body 2, a sealing block 27 is provided. The sealing block 27 is located above the first piston 3 and fixedly connected to the first piston 3. The movement of the first piston 3 will drive the sealing block 27 to move together. The sealing block 27 is used to seal the pressurizing port 26 and the pressure relief port 22. Specifically, when the lever 7 is in a horizontal state, the sealing block 27 seals the pressurizing port 26 and the pressure relief port 22, so that a closed space is formed inside the first cylinder body 2 to maintain the pressure inside the first cylinder body 2.

[0050] After the sealing block 27 moves upward by a first distance, the pressurizing port 26 can be communicated with the inside of the first cylinder body 2. In other words, an increase in the pressure applied to the first piston 3 will cause the first piston 3 to move upward. The upward movement of the first piston 3 will cause the lever 7 to deviate from the horizontal state through the piston rod 4. And the upward movement of the first piston 3 will drive the sealing block 27 to move upward. After the sealing block 27 moves upward, the pressurizing port 26 can be communicated with the inside of the first cylinder body 2. The pressurizing member 23 conveys gas into the first cylinder body 2. The increase in the gas inside the first cylinder body 2 will cause the first piston 3 to move downward again, and then drive the sealing block 27 to move downward until the sealing block 27 reseals the pressurizing port 26, and the inside of the first cylinder body 2 becomes sealed again, and the lever 7 approaches the horizontal state again. This operation reduces the operation of manually pressurizing and leveling the lever 7, and the operation is relatively convenient.

[0051] After the sealing block 27 moves downward by a second distance, the pressure relief port 22 can be communicated with the inside of the first cylinder body 2. In other words, a decrease in the pressure applied to the first piston 3 will cause the first piston 3 to move downward. The downward movement of the first piston 3 will cause the lever 7 to deviate from the horizontal state through the piston rod 4. And the downward movement of the first piston 3 will drive the sealing block 27 to move downward. After the sealing block 27 moves downward, the pressure relief port 22 can be communicated with the inside of the first cylinder body 2. The pressure relief member extracts the gas inside the first cylinder body 2. The decrease in the gas inside the first cylinder body 2 will cause the first piston 3 to move upward again, and then drive the sealing block 27 to move upward until the sealing block 27 reseals the pressure relief port 22, and the inside of the first cylinder body 2 becomes sealed again, and the lever 7 approaches the horizontal state again. This operation reduces the operation of manually relieving pressure and leveling the lever 7, and the operation is relatively convenient.

[0052] It should be noted that when performing the routine calibration of the to-be-tested meter 6, the pressure relief valve 21, the pressure increasing valve 25, the pressure relief member, and the pressure increasing member 23 need to be opened. When performing the instantaneous pressure bearing calibration of the to-be-tested meter 6, the pressure relief valve 21, the pressure increasing valve 25, the pressure relief member, and the pressure increasing member 23 need to be closed.

[0053] Refer to Figure 6, the pressure regulating component further includes a fine-tuning component for regulating the pressure inside the first cylinder body 2, and the fine-tuning component is communicated with the upper end of the first cylinder body 2. Specifically, the fine-tuning component includes a second cylinder body 28, a second piston 29 and a second lead screw 30. The second cylinder body 28 is a hollow cylindrical structure with one end open. The second cylinder body 28 is horizontally arranged on the base 1. The end of the second cylinder body 28 away from the open end is communicated with the top of the first cylinder body 2 through a gas conduit. The second piston 29 is located inside the second cylinder body 28 and is slidably and sealingly connected to the second cylinder body 28 along the length direction of the second cylinder body 28. One end of the second lead screw 30 is rotatably connected to the second piston 29 through a bearing, and the other end extends out of the second cylinder body 28 towards the open end of the second cylinder body 28. A fixing block is sleeved outside the second lead screw 30 and is threadedly connected with the fixing block, and the fixing block is fixed on the base 1.

[0054] By rotating the second lead screw 30, the second lead screw 30 can move along the length direction of the second cylinder body 28, and then drive the second piston 29 to slide along the length direction of the second cylinder body 28. When the second piston 29 slides inside the second cylinder body 28, the gas in the second cylinder body 28 is conveyed into the first cylinder body 2, or the gas in the first cylinder body 2 is pumped into the second cylinder body 28, so as to realize the fine-tuning of the pressure inside the first cylinder body 2 and make the lever 7 in a horizontal state in combination with the spirit level 13.

[0055] It should be understood that it is also possible not to have the fine-tuning component in this solution. In other words, only when the lever 7 is in a horizontal state, the sealing block 27 can seal the pressurizing port 26 and the pressure relief port 22. When there is a slight change in the pressure borne by the first piston 3, the sealing block 27 can be driven to move synchronously, so that the pressurizing port 26 or the pressure relief port 22 is communicated with the inside of the first cylinder body 2, and then the pressure inside the first cylinder body 2 is adjusted through the pressurizing member 23 or the pressure relief member, so that the lever 7 returns to the horizontal state again.

[0056] It should be understood that the above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A pressure gauge calibration device, characterized in that, Comprising: Base; Piston component, the piston component includes a first cylinder body, a first piston and a piston rod. The first cylinder body is a hollow cylindrical structure with one end open. The first cylinder body is vertically arranged on the base with the open end facing downwards. The first piston is located inside the first cylinder body and is slidably and sealingly connected to the first cylinder body along the length direction of the first cylinder body. The lower end of the first piston is hinged to the upper end of the piston rod. The lower end of the piston rod extends vertically downwards. The upper end of the first cylinder body is communicated with a standard meter and an installation part for installing the meter to be inspected; Lever component, the lever component includes a horizontally arranged lever. One end of the lever is fixedly connected to the lower end of the piston rod. A pressure application component is arranged at the other end of the lever. A first slider is slidably arranged on the lever. The first slider can slide along the length direction of the lever. An adjusting component is arranged on the base. The first slider is hinged to the base through the adjusting component. By means of the adjusting component, the position of the first slider on the lever can be changed, thereby changing the fulcrum of the lever; Pressure regulating component, the pressure regulating component is communicated with the upper end of the first cylinder body and is used for regulating the internal pressure of the first cylinder body.

2. The pressure gauge calibration device according to claim 1, characterized in that: The adjusting component includes a second slider and a first lead screw. The second slider is rotatably connected to the first slider. The second slider is sleeved on the first lead screw and is threadedly connected to the first lead screw. The first lead screw is rotatably connected to the base.

3. The pressure gauge calibration device according to claim 2, characterized in that: A spirit level is arranged on the lever. The spirit level is arranged along the length direction of the lever.

4. The pressure gauge calibration device according to claim 3, characterized in that: The lever is provided with scale lines. The scale lines are arranged along the length direction of the lever.

5. The pressure gauge calibration device according to claim 4, characterized in that: Limit blocks are arranged on both sides of the first slider. Both of the two limit blocks are slidably arranged on the lever along the length direction of the lever. The position between the two limit blocks is the sliding range of the first slider. Locking pieces for fixing the limit blocks to the lever are arranged on both of the two limit blocks.

6. A pressure gauge calibration device according to any one of claims 2-5, characterized in that: A locking component for restricting the rotation of the first slider relative to the second slider is arranged on the base.

7. A pressure gauge calibration device according to claim 6, characterized in that: The pressure regulating component includes a pressure relief component and a pressure increasing component. The pressure relief component includes a pressure relief piece, a pressure relief pipe and a pressure relief valve installed on the pressure relief pipe. A pressure relief port communicating with the inside of the first cylinder body is opened on the outer side wall of the upper end of the first cylinder body. The pressure relief port is communicated with one end of the pressure relief pipe, and the other end of the pressure relief pipe is communicated with the pressure relief piece; The increasing component includes a pressure increasing piece, a pressure increasing pipe and a pressure increasing valve arranged on the pressure increasing pipe. A pressure increasing port communicating with the inside of the first cylinder body is opened on the outer side wall of the upper end of the first cylinder body. The pressure increasing port is communicated with one end of the pressure increasing pipe, and the other end of the pressure increasing pipe is communicated with the pressure increasing piece. The pressure increasing port is located below the pressure relief port; A sealing block is arranged inside the first cylinder body. The sealing block is located above the first piston and is fixedly connected to the first piston. The sealing block is used for sealing the pressure increasing port and the pressure relief port. After the sealing block moves upwards by a first distance, the pressure increasing port can be communicated with the inside of the first cylinder body. After the sealing block moves downwards by a second distance, the pressure relief port can be communicated with the inside of the first cylinder body; The pressure regulating component further includes a fine adjustment component for regulating the internal pressure of the first cylinder body. The fine adjustment component is communicated with the upper end of the first cylinder body.

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