CN108825585B - Liquid-gas conversion type gas pulsation pressure amplifying device - Google Patents

Liquid-gas conversion type gas pulsation pressure amplifying device Download PDF

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CN108825585B
CN108825585B CN201810810991.8A CN201810810991A CN108825585B CN 108825585 B CN108825585 B CN 108825585B CN 201810810991 A CN201810810991 A CN 201810810991A CN 108825585 B CN108825585 B CN 108825585B
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liquid
gas
piston
hydraulic
pressure
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CN108825585A (en
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孟晓风
吴银锋
庆宇栋
聂晶
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Beihang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The device belongs to a dynamic pressure generation technology, and relates to a liquid-gas conversion type gas pulsation pressure amplifying device which comprises a hydraulic control unit, a pulsation generation unit and a liquid-gas conversion unit. The pulsation generating unit comprises a hydraulic cylinder, an end cover, a piston and a connecting rod. The piston and the connecting rod divide the hydraulic cylinder into a liquid cavity A and a liquid cavity B, and an oil inlet hole and an oil outlet hole are respectively formed in the piston and the connecting rod. The hydraulic control unit is connected with the oil inlet hole. The liquid-gas conversion unit comprises two liquid-gas conversion cylinders and rodless pistons inside the liquid-gas conversion cylinders. The two liquid-gas conversion cylinders are respectively connected with the oil outlets of the liquid cavity A and the liquid cavity B, and the lower end of the rodless piston is respectively provided with an air cavity A and an air cavity B. The device of the invention utilizes the unchanged volume of the liquid and increases the displacement of the rodless piston and the amplitude of the gas pulsating pressure in a diameter-changing mode; by controlling the initial positions of the hydraulic cylinder piston and the rodless piston, the volume and the initial pressure in the air cavity A and the air cavity B are the same, the influence caused by gas static pressure offset is effectively solved, and the pulsating pressure frequency range is widened.

Description

Liquid-gas conversion type gas pulsation pressure amplifying device
Technical Field
The invention belongs to a dynamic pressure generation technology, and particularly relates to a liquid-gas conversion type gas pulsation pressure amplifying device.
Background
Pressure is an important parameter in both military science and technology fields and production life, and can be divided into static pressure and dynamic pressure. Dynamic pressure widely exists in each field, and the accurate measurement of dynamic pressure has positive meaning to improving scientific and technological level, promotion product quality.
Calibration of the pressure sensor is required prior to dynamic pressure measurement using the sensor. Sensor calibration methods can be classified into a relative method and an absolute method. The correlation method is to correct the output of the calibrated sensor to be the same as the output of the standard sensor under the same test environment. The accuracy of the calibrated sensor does not exceed that of a standard sensor. The absolute method is to calibrate the sensor by using a dynamic pressure signal with known parameters generated by the pressure generating device. The accuracy of the calibrated sensor is limited by the parameters of the pressure generating device. In order to obtain a pressure sensor with higher accuracy, it is preferable to calibrate the sensor using a pressure generating device with higher accuracy.
Common dynamic pressure signals can be classified into pulse signals, step signals, and sinusoidal signals, depending on the type of signal. Among them, the sinusoidal pressure signal is a recognized ideal pressure sensor calibration signal due to the advantage of high repeatability. A gas sinusoidal signal can be obtained by mechanical means, but its signal amplitude drops rapidly with increasing frequency. The gas pressure signal is attenuated and distorted during propagation due to viscosity, friction, etc., and the small amplitude gas pressure signal is affected more by the attenuation. This presents a great problem for the accurate measurement of small amplitude pressure signals, and also restricts the frequency range of sinusoidal pressure signals generated by mechanical devices.
The working environment pressures of the pressure sensors are greatly different, and the measurement precision and accuracy of the sensors in specific working environments can be improved by calibrating the pressure sensors according to different environment pressures. Existing pressure sensor calibration equipment rarely accounts for the effects of ambient pressure on the pressure sensor output.
Disclosure of Invention
The invention provides a liquid-gas conversion type gas pulsating pressure amplifying device, which mainly solves the problems that in the prior art, a mechanical device generates a high-frequency gas pulsating pressure signal, the amplitude is too small and cannot be adjusted, and the generation of the gas pressure signal in a bias environment is rarely considered. The pressure generating device can adjust the initial static pressure of the gas to generate an environment with certain bias pressure; amplifying the amplitude of the gas pulsating pressure signal; the pulsating pressure range is widened, and the gas pulsating pressure signal with adjustable amplitude is generated in a certain frequency range. The influence of attenuation and distortion of the high-frequency pulsating pressure signal on the measurement result of the sensor is reduced by increasing the amplitude of the high-frequency pulsating pressure signal, and the accuracy of the corrected sensor is improved.
The technical problem of the invention is mainly solved by the following technical scheme:
a liquid-gas conversion type gas pulsation pressure amplifying device comprises a hydraulic control unit, a pulsation generating unit and a liquid-gas conversion unit.
The pulsation generating unit comprises a hydraulic cylinder, end covers at two ends, a piston and a connecting rod.
The piston and the connecting rod are in a cross symmetrical structure, and the tail ends of the connecting rods respectively extend out of the end covers at the two ends.
The piston and the connecting rod divide the hydraulic cylinder into a hydraulic cavity A and a hydraulic cavity B.
And the liquid cavity A is respectively provided with an oil inlet A and an oil outlet B.
And the liquid cavity B is respectively provided with an oil inlet A and an oil outlet B.
The hydraulic control unit comprises a hydraulic adjusting device and two hydraulic valves of a flow adjusting valve.
One end of the flow regulating valve is connected with the hydraulic regulating device; the other end of the flow regulating valve is connected with one end of two hydraulic valves; the other ends of the two hydraulic valves are respectively connected with an oil inlet A of the liquid cavity A and an oil inlet B of the liquid cavity B.
The liquid-gas conversion unit comprises two liquid-gas conversion cylinders and two rodless pistons.
The two hydraulic-pneumatic conversion cylinders have the same size; the upper end of a liquid-gas conversion cylinder is connected with an oil outlet A of the liquid cavity A; the other liquid-gas conversion cylinder is connected with an oil outlet B of the liquid cavity B; the two rodless pistons are respectively placed in the two liquid-gas conversion cylinders to divide the liquid-gas conversion cylinders into two parts; the upper parts of the two rodless pistons are respectively communicated with the liquid cavity A and the liquid cavity B, and the lower parts of the two rodless pistons are respectively provided with an air cavity A and an air cavity B.
The device has the advantages that:
due to incompressibility of liquid, the volume of the liquid pushed by the reciprocating motion of the piston and the connecting rod is not changed, and under the condition that the effective area of the hydraulic cylinder is fixed, the motion displacement of the rodless piston can be amplified to different degrees by designing the liquid-gas conversion cylinders with different cross-sectional areas, so that the amplitude of pulsating pressure is amplified;
the initial position of the rodless piston in the liquid-gas conversion cylinder can be adjusted by adjusting the volume of liquid in the liquid cylinder, the initial volume of a gas cavity in the liquid-gas conversion cylinder is changed, and the initial pressure of gas in the gas cavity is adjusted;
the initial positions of the hydraulic cylinder piston and the rodless piston are controlled, so that the initial pressure and the volume in the two air cavities are the same, the influence caused by gas static pressure offset is effectively solved, and the pulsating pressure frequency range is widened;
the device combines the design of the size of the liquid-gas conversion cylinder and the adjustment of the position of the rodless piston, can generate gas pulsating pressure signals with adjustable initial static pressure and adjustable amplitude within a certain frequency range, increases the amplitude of high-frequency pulsating pressure, widens the pulsating pressure range, reduces the influence caused by the distortion and attenuation of the pulsating pressure signals, and improves the precision of the calibrated sensor.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Reference numerals: 1. the hydraulic pressure adjusting device comprises a hydraulic pressure adjusting device, 2, a flow adjusting valve, 3, a hydraulic valve, 4, a hydraulic valve, 5, oil inlet holes A, 6, oil inlet holes B, 7, end covers A, 8, a hydraulic cylinder, 9, end covers B, 10, a piston and a connecting rod, 11, hydraulic cavities A, 12, hydraulic cavities B, 13, oil outlet holes A, 14, oil outlet holes B, 15, hydraulic-pneumatic conversion cylinders A, 16, hydraulic-pneumatic conversion cylinders B, 17, rodless pistons A, 18, rodless pistons B, 19, air cavities A, 20, air cavities B, 21, pulsating pressure measuring ports A, 22 and a pulsating pressure measuring port B.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples with reference to fig. 1.
The present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
A liquid-gas conversion type gas pulsation pressure amplifying device comprises a hydraulic control unit, a pulsation generating unit and a liquid-gas conversion unit.
The pulsation generating unit comprises a hydraulic cylinder 8, an end cover A7, an end cover B9, a piston and a connecting rod 10. The end covers A7 and B9 are respectively connected to two ends of the hydraulic cylinder 8, the piston and the connecting rod 10 are in a cross-shaped symmetrical structure, the tail ends of the connecting rod respectively extend out of the end covers A7 and B9, and the piston and the connecting rod 7 divide the hydraulic cylinder 8 into a liquid cavity A11 and a liquid cavity B12. An oil inlet A5 is arranged at the left end of the hydraulic cylinder 8 or on the end cover A7; an oil inlet hole B6 is arranged at the right end of the hydraulic cylinder 8 or on the end cover B9. An oil outlet A13 is formed in the left end of the hydraulic cylinder 8 or the end cover A7; the right end of the hydraulic cylinder 8 or the end cover B9 is provided with an oil outlet B14.
The hydraulic control unit comprises a hydraulic adjusting device 1, a flow adjusting valve 2, a hydraulic valve A3 and a hydraulic valve B4. One end of the flow regulating valve 2 is connected with the hydraulic regulating device 1; the other end of the hydraulic valve is respectively connected with one end of a hydraulic valve A3 and one end of a hydraulic valve B4; the other end of the hydraulic valve A3 is connected with an oil inlet hole A5; the other end of the hydraulic valve B4 is connected with an oil inlet hole B6.
The liquid-gas conversion unit comprises a liquid-gas conversion cylinder A15, a liquid-gas conversion cylinder B16, a rodless piston A17 and a rodless piston B18. The size of the liquid-gas conversion cylinder A15 is the same as that of the liquid-gas conversion cylinder B16; the upper end of the liquid-gas conversion cylinder A15 is communicated with an oil outlet A13; the liquid-gas conversion cylinder B16 is communicated with the oil outlet B14; the rodless piston A17 is placed in the liquid-gas conversion cylinder A15, and divides the liquid-gas conversion cylinder A15 into two parts; the upper part of the rodless piston A17 is communicated with the liquid cavity A11, and the lower part of the piston is an air cavity A19; the rodless piston B18 is placed in the liquid-gas conversion cylinder B16 to divide the liquid-gas conversion cylinder B16 into two parts; the upper part of the rodless piston B18 is communicated with the liquid cavity B12, and the lower part of the piston is provided with an air cavity B20. The bottom of the air cavity A19 is provided with a pulsating pressure measuring port A21, and the bottom of the air cavity B20 is provided with a pulsating pressure measuring port B22.
And opening the flow regulating valve 2, the hydraulic valve A3 and the hydraulic valve B4, and injecting liquid into the liquid cavity A11 and the liquid cavity B12 by the hydraulic regulating device 1. After the liquid cavity A11 and the liquid cavity B12 are filled with liquid, the liquid enters the liquid-gas conversion cylinder A15 and the liquid-gas conversion cylinder B16 to push the rodless piston A17 and the rodless piston B18 to move. Since the fluid chamber a 11 and the fluid chamber B12 are in a communicating state at this time, the rodless piston a17 has the same initial position as the rodless piston B18. The initial pressure and volume in the air chamber a19 and the air chamber B20 are the same. The initial positions of the rodless piston a17 and the rodless piston B18 can be adjusted by adjusting the volume of the injected liquid by the hydraulic pressure adjusting device 1.
The initial positions of the rodless piston A17 and the rodless piston B18 are adjusted, and the flow regulating valve 2, the hydraulic valve A3 and the hydraulic valve B4 are closed. The piston and the connecting rod 10 reciprocate in the hydraulic cylinder 8 to push the liquid in the liquid cavity A11 and the liquid cavity B12 to move, and further push the rodless piston A17 and the rodless piston B18 to move. The rodless piston A17 compresses the gas in the gas chamber A19, and generates pulsating pressure at a pulsating pressure measurement port A21.
The liquid-gas conversion type gas pulsation pressure amplifying device has the following basic principle:
the displacement of the piston and the connecting rod is as follows:
L1＝lsin(ωt)
magnification:
Figure GDA0002322917890000061
the displacement of the rodless piston is as follows:
L2＝βlsin(ωt)
dynamic-static pressure ratio:
Figure GDA0002322917890000062
pulsating pressure measurement port pressure:
Figure GDA0002322917890000063
in the formula:
S1-a hydraulic cylinder effective area;
S2-hydraulic-pneumatic pressure conversion cylinder cross-sectional area;
l-piston and connecting rod sinusoidal motion single peak value;
omega-piston and connecting rod sinusoidal motion angular frequency;
P0-an initial pressure in the air chamber;
the distance between the L' -rodless piston and the pulsating pressure measuring port;
the device can amplify the motion displacement of the rodless piston, and the amplification times of the hydraulic-pneumatic pressure conversion cylinders with different cross-sectional areas are different; the liquid volume is adjusted through the hydraulic control unit, the distance between the rodless piston and the pulsating pressure measuring port can be changed, and the initial static pressure of gas in the air cavity is adjusted. The device combines the two, can generate pulsating pressure signals with adjustable initial pressure and adjustable pressure amplitude in a low-frequency to high-frequency range, increases the pulsating pressure amplitude under the high-frequency condition, and reduces signal attenuation and distortion caused by the loss of pressure in the transmission due to undersize signal amplitude and the like.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or scope of the invention as defined in the appended claims.
Although the terms of the hydraulic pressure adjusting device 1, the flow rate adjusting valve 2, the hydraulic valve A3, the hydraulic valve B4, the oil inlet A5, the oil inlet B6, the end cover A7, the hydraulic cylinder B8, the end cover A9, the piston and connecting rod 10 of 1, the liquid chamber a 11, the liquid chamber B12, the oil outlet a 13, the oil outlet B14, the liquid-gas conversion cylinder a 15, the liquid-gas conversion cylinder B16, the rodless piston a17, the rodless piston B18, the gas chamber a19, the gas chamber B20, the pulsation pressure measuring port a 21, the pulsation pressure measuring port B22, and the like are used more often, the possibility of using other terms is not excluded. These terms are used for the purpose of more conveniently describing and explaining the essence of the present invention; they are to be construed as being without limitation to any such additional limitations.

Claims (10)

1. A liquid-gas conversion type gas pulsation pressure amplifying device is characterized by comprising a pulsation generating unit, a hydraulic control unit and a liquid-gas conversion element; the hydraulic-pneumatic conversion unit comprises a hydraulic-pneumatic conversion cylinder A (15), a hydraulic-pneumatic conversion cylinder B (16), a rodless piston A (17) and a rodless piston B (18); the size of the liquid-gas conversion cylinder A (15) is the same as that of the liquid-gas conversion cylinder B (16); the upper end of the liquid-gas conversion cylinder A (15) is connected with the oil outlet A (13); the upper end of the liquid-gas conversion cylinder B (16) is connected with the oil outlet B (14); a rodless piston A (17) is arranged in the liquid-gas conversion cylinder A (15) to divide the liquid-gas conversion cylinder A (15) into two parts; the upper part of the piston is communicated with the liquid cavity A (11), and the lower part of the piston is provided with an air cavity A (19); a rodless piston B (18) is arranged in the liquid-gas conversion cylinder B (16) to divide the liquid-gas conversion cylinder B (16) into two parts; the upper part of the piston is communicated with the liquid cavity B (12), and the lower part of the piston is provided with an air cavity B (20).
2. The gas pulse pressure amplifying device according to claim 1, wherein the pulse generating unit comprises a hydraulic cylinder (8), an end cover A (7), an end cover B (9), a piston and a connecting rod (10).
3. The gas pulse pressure amplifying device according to claim 2, wherein the end cap A (7) and the end cap B (9) are connected to both ends of the hydraulic cylinder (8), respectively.
4. The gas pulsation pressure amplifying device according to claim 2, wherein said piston and connecting rod (10) are cross-symmetrical, the ends of the connecting rod respectively extend out of the end cap A (7) and the end cap B (9), and the piston and connecting rod (10) divide the hydraulic cylinder (8) into a liquid cavity A (11) and a liquid cavity B (12).
5. The gas pulsation pressure amplifying device according to claim 4, wherein said liquid chamber A (11) is provided with an oil inlet A (5) and an oil outlet A (13); an oil inlet B (6) and an oil outlet B (14) are arranged on the liquid cavity B (12).
6. The liquid-gas switching type gas pulsation pressure amplifying device according to claim 1, wherein the hydraulic control unit comprises a hydraulic pressure adjusting device (1), a flow rate adjusting valve (2), a hydraulic valve A (3) and a hydraulic valve B (4).
7. The gas pulsation pressure amplifying device according to claim 6, wherein one end of the flow regulating valve (2) is connected with the hydraulic pressure regulating device (1); the other end is respectively connected with one end of a hydraulic valve A (3) and one end of a hydraulic valve B (4); the other end of the hydraulic valve A (3) is connected with an oil inlet A (5); the other end of the hydraulic valve B (4) is connected with an oil inlet B (6).
8. The device for amplifying the pressure of gas pulsation according to claim 1, wherein the hydraulic control unit is used for adjusting the volumes of liquid in the liquid chamber a (11) and the liquid chamber B (12), controlling the initial positions of the rodless piston a (17) and the rodless piston B (18) and the initial static pressures of gas in the gas chamber a (19) and the gas chamber B (20), and ensuring that the volumes of the gas chamber a (19) and the gas chamber B (20) are the same as the initial static pressures.
9. The gas pulse pressure amplifying device according to claim 2, wherein the piston and the connecting rod (10) reciprocate in the cylinder (8) along the axial direction and drive the liquid in the liquid chamber A (11) and the liquid chamber B (12) to move, so that the rodless piston A (17) and the rodless piston B (18) reciprocate.
10. The gas pulse pressure amplifying device according to claim 1, wherein the rodless piston A (17) and the rodless piston B (18) reciprocate to change the initial static pressure of the gas in the gas chamber A (19) and the gas chamber B (20) to generate the pulse pressure.
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CN114852118A (en) * 2022-04-29 2022-08-05 株洲时代新材料科技股份有限公司 Connecting rod length adjusting method and hydraulic connecting rod
CN115235685A (en) * 2022-08-03 2022-10-25 北京航空航天大学 Three-cavity type high-frequency large-amplitude gas dynamic pressure generating device

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US4765225A (en) * 1986-08-22 1988-08-23 Birchard William G Digitally controlled air-over-hydraulic actuator and method
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JP2004230510A (en) * 2003-01-30 2004-08-19 Nippei Toyama Corp Pressure fluid supply device on machine tool
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