CN108561370B - Gas pulsating pressure generating device - Google Patents
Gas pulsating pressure generating device Download PDFInfo
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- CN108561370B CN108561370B CN201810810909.1A CN201810810909A CN108561370B CN 108561370 B CN108561370 B CN 108561370B CN 201810810909 A CN201810810909 A CN 201810810909A CN 108561370 B CN108561370 B CN 108561370B
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- pressure
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- piston
- connecting rod
- air cavity
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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
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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
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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
- F15B15/1447—Pistons; Piston to piston rod assemblies
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
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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)
Abstract
The invention belongs to a dynamic pressure generation technology, and relates to a gas pulsating pressure generation device which comprises a pulsating pressure generation unit and a static pressure regulation unit. The pulsating pressure generating unit comprises a piston, a connecting rod, a cylinder and end covers at two ends. The piston and the connecting rod are in a cross symmetrical structure, and the tail end of the connecting rod extends out of the end covers at the two ends. The piston and the connecting rod divide the cylinder into an air cavity A and an air cavity B. The air cavity A and the air cavity B are respectively provided with a pressure adjusting hole. The end cover is provided with a pulsating pressure measuring port. The static pressure regulating unit comprises a pressure source, a flow regulating valve and two pressure regulating valves. One end of each pressure regulating valve is connected with the air pressure source, and the other end of each pressure regulating valve is connected with the two pressure regulating holes respectively. The device can adjust the initial static pressure of the cylinder and generate pulsating pressure under a certain static pressure, thereby widening the range of the pulsating pressure. The double-cavity structure designed by the device can effectively reduce the driving force required by the reciprocating motion of the connecting rod, and obtain larger pulsating pressure amplitude under the same driving force.
Description
Technical Field
The invention belongs to a dynamic pressure generation technology, and particularly relates to a broadband gas pulsating pressure generation device.
Background
Pressure measurement has wide application in national defense science and technology, industrial production and daily life. The pressure amplitude and frequency to be measured varies from case to case. In the processes of engine combustion test, wind tunnel test and the like, the pressure can change in a pulsating mode under a certain value. How to accurately measure the pressure changes is very helpful for optimizing engine parameters, improving the combustion efficiency of the engine, improving the flow field quality of the wind tunnel and the like.
The method is simple and easy to implement and can generate pulsating pressure by utilizing the reciprocating motion of the piston in the cylinder. But the forces externally applied to the piston and connecting rod are limited due to the movement of the piston. If one wants to obtain the pulsating pressure under the condition that the initial static pressure is higher than the atmospheric pressure, the traditional structure can increase the difficulty and the cost for obtaining the pulsating pressure signal. Because the bias force generated by the air pressure difference at the two ends of the piston can be increased along with the increase of the initial static pressure, the proportion of the effective thrust for pushing the piston and the connecting rod to reciprocate to the total thrust is reduced, and the amplitude of the pulsating pressure generated by the device is reduced.
Disclosure of Invention
The invention provides a gas pulsating pressure generating device which can generate gas pulsating pressure under different static pressures, has simple structure, effectively reduces the bias force generated by the pressure difference at the two ends of a piston, improves the proportion of the effective thrust acting on the piston and a connecting rod to the total thrust, increases the amplitude of the pulsating pressure, widens the range of the pulsating pressure and reduces the difficulty and the cost of generating the gas pulsating pressure under the high-pressure condition.
A gas pulsating pressure generation device comprises a pulsating pressure generation unit and a static pressure regulation unit, wherein the pulsating pressure generation unit comprises: cylinder, piston and connecting rod and both ends end cover, wherein:
the piston and the connecting rod divide the cylinder into an air cavity A and an air cavity B;
the air cavity A and the air cavity B are respectively provided with a pressure adjusting hole;
the piston and the connecting rod are in a cross symmetrical structure, and the tail end of the connecting rod extends out of the end covers at the two ends;
the end cover is provided with pulsating pressure measuring ports, and the number and the size of the pulsating pressure measuring ports are determined according to requirements;
the static pressure adjusting unit comprises a pressure source and two pressure adjusting valves;
the air pressure source is connected with one end of each of the two pressure regulating valves;
the other ends of the two pressure regulating valves are respectively connected with pressure regulating holes on the air cavity A and the air cavity B. (ii) a
The static pressure adjusting unit can control the initial static pressure of the gas in the air cavity A and the gas in the air cavity B.
The invention has the following advantages:
the initial static pressure of the gas in the gas cavity A and the gas cavity B is adjustable;
the reciprocating motion of the piston can generate gas pulsating pressure under different static pressures;
the initial static pressure in the air cavity A is the same as that in the air cavity B, the bias force at the two ends of the piston caused by the pressure difference is reduced, the driving force required by the reciprocating motion of the piston and the connecting rod is reduced, the proportion of the effective thrust acting on the piston and the connecting rod to the total thrust is increased, and larger gas pulse pressure can be generated at a pulse pressure measuring port; the calibration of the pressure sensor is easy to realize;
the position of the pulsating pressure measuring port can be determined according to actual conditions, and is used for realizing absolute calibration or relative calibration of the pressure sensor;
the pulsating pressure generating device has a simple integral structure, can generate pulsating pressure with larger amplitude under certain static pressure by using smaller thrust, widens the range of the pulsating pressure and reduces the cost of the pulsating pressure generating device.
Drawings
Fig. 1 is a schematic structural view of end caps on both sides of a pulsating pressure measurement port according to the present invention.
Reference numerals: 1. the device comprises a gas pressure source, an A2 pressure regulating valve, a B3 pressure regulating valve, a4 pressure regulating hole, a B5 pressure regulating hole, a 6 piston and connecting rod, a 7 cylinder, an A8 end cover, a B9 end cover, a10 air cavity A, an A11 air cavity B, an A12 pulsating pressure measuring port, a B13 pulsating pressure measuring port.
Detailed description of the invention
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.
Example 1
Referring to fig. 1, a gas pulsating pressure generating device includes:
the pulsating pressure generating unit comprises a piston and connecting rod 6, a cylinder 7, an end cover A8 and an end cover B9. The piston and the connecting rod 6 divide the cylinder 7 into an air chamber a10 and an air chamber B11. The piston is located at the middle position of the cylinder 7, and the air cavity A10 and the air cavity B11 have the same volume. A pressure adjusting hole A4 is formed on the air cavity A10; the air chamber B11 is provided with a pressure adjusting hole B5. The piston and the connecting rod 6 are in a cross symmetrical structure, and the tail end of the connecting rod extends out of an end cover A8 and an end cover B9 respectively. The end cover A8 and the end cover B9 are respectively provided with a pulsating pressure measuring port A12 and a pulsating pressure measuring port B13.
The static pressure adjusting unit includes: a pressure source 1, a pressure regulating valve A2 and a pressure regulating valve B3. The air pressure source 1 is connected to the air inlets of the pressure regulating valves a2 and B3. The outlet of the pressure regulating valve A2 is connected to a pressure regulating hole A4, and the outlet of the pressure regulating valve B3 is connected to a pressure regulating hole B5.
The dimensions of the pulsating pressure measurement port a12 and the pulsating pressure measurement port B13 match the pressure sensor dimensions. The standard pressure sensor and the calibrated pressure sensor are respectively arranged in the pulsating pressure measuring port A12 and the pulsating pressure measuring port B13 and are sealed. The pressure regulating valves a2 and B3 are opened, and the initial static pressures of the air chamber a10 and the air chamber B11 are regulated by the air pressure source 1, which is denoted as P0. The pressure regulating valve a2 and the pressure regulating valve B3 are closed, a driving force is applied to the piston and the connecting rod 6, the piston and the connecting rod 6 reciprocate in the cylinder 7, and pulsating pressures are generated at the pulsating pressure measuring port a12 and the pulsating pressure measuring port B13.
The basic principle of the gas pulsation pressure generating device is as follows:
the displacement of the piston is:
s＝l sin(ω·t) (1)
the acceleration of the piston is:
a＝ω2l sin(ω·t) (2)
the pressure at the pulsating pressure measurement port a12 is:
P1(t)≈P0[1+αsin(ω·t)](3)
the pressure at the pulsating pressure measurement port B13 is:
P2(t)≈P0[1-αsin(ω·t)](4)
dynamic-static pressure ratio:
the equation of motion of the piston and the connecting rod is as follows:
F-Fdif＝ma (6)
the bias force generated by the pressure difference at the two ends of the piston is as follows:
Fdif＝(P1(t)-P2(t))·S
＝2αsin(ω·t)·P0·S (7)
the bias force generated by the pressure difference at two ends of the piston in the traditional structure is as follows:
F′dif＝(P1(t)-Pref)·S
＝(P0-Pref)·S+α·P0·sin(ω·t)·S (8)
in the formula:
l-single peak of piston motion;
omega-piston angular frequency of motion;
p0-initial pressure in air cavity A10 and air cavity B11;
pref-atmospheric pressure;
l-air cavity A10 length;
f-maximum thrust externally applied to the piston and the connecting rod;
m-total mass of piston and connecting rod;
a-the maximum acceleration that the piston and connecting rod can achieve;
s-effective area of piston in cylinder;
the pressure P1(t) generated at the pulsating pressure measurement port a12 of fig. 1 is the same as the amplitude of the pulsating pressure generated by the structure. Because the distance of the piston movement is limited, for the conventional structure, the pressure difference between the two ends of the piston is mainly determined by the difference between the initial pressure in the cylinder and the atmospheric pressure. Under the condition that the areas of the two ends of the piston are fixed, the larger the initial pressure in the cylinder is, the larger the air pressure difference of the two ends of the piston is, and the larger the biasing force generated by the pressure difference is. For the present device, the pressure difference between the two ends of the piston is mainly determined by the product of the initial pressure in the cylinder and the ratio of the dynamic pressure and the static pressure. For a given thrust and a designed cylinder, the biasing force due to the pressure difference at different initial pressures can be reduced by properly adjusting the dynamic-static pressure ratio (i.e., the distance of movement of the piston). The comparison shows that the device can greatly reduce the bias force caused by the air pressure difference at the two ends of the piston, greatly broaden the range of the pulsating pressure and improve the amplitude of the pulsating pressure. The device can use smaller thrust to generate pulsating pressure with larger amplitude under different initial static pressure conditions, and the cost for generating gas pulsating pressure is reduced. The pressure sensor is installed and sealed at the pulsating pressure measuring port A12, and the absolute calibration of the sensor can be carried out by using the formula.
Example 1 illustrates only one pulsating pressure measurement port case where absolute calibration of the pressure sensor can be achieved. When the pulsating pressure measuring port which is symmetrical about the center of the connecting rod is arranged on the end cover on one side, the relative calibration can be realized by using a standard sensor.
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 air pressure source 1, the pressure regulating valve a2, the pressure regulating valve B3, the pressure regulating hole a4, the pressure regulating hole B5, the piston and connecting rod 6, the cylinder 7, the end cap A8, the end cap B9, the air chamber a10, the air chamber B11, the pulsating pressure measuring port a12, the pulsating pressure measuring port B13, and the like are used more often herein, 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 (4)
1. The gas pulsating pressure generation device is characterized by comprising a pulsating pressure generation unit and a static pressure regulation unit, wherein the pulsating pressure generation unit comprises a piston, a connecting rod (6), a cylinder (7), an end cover A (8) and an end cover B (9); the piston and the connecting rod (6) are in a cross symmetrical structure, the piston and the connecting rod (6) divide the cylinder (7) into an air cavity A (10) and an air cavity B (11), and two ends of the connecting rod respectively extend out of the end cover A (8) and the end cover B (9); the static pressure adjusting unit comprises an air pressure source (1), a pressure adjusting valve A (2) and a pressure adjusting valve B (3), one end of each of the pressure adjusting valve A (2) and the pressure adjusting valve B (3) is connected with the air pressure source (1), and the other end of each of the pressure adjusting valve A (2) and the pressure adjusting valve B (3) is respectively connected with a pressure adjusting hole A (4) and a pressure adjusting hole B (5); the pressure adjusting hole A (4) and the pressure adjusting hole B (5) are respectively arranged on the air cavity A (10) and the air cavity B (11); pulse pressure measuring ports are formed in the end cover A (8) and the end cover B (9); the static pressure adjusting unit is used for adjusting the initial static pressure in the air cavity A (10) and the air cavity B (11);
the piston is positioned in the middle of the cylinder (7) in an initial state, and the volume of the air cavity A (10) is the same as that of the air cavity B (11); the air pressure source (1) adjusts the air cavity A (10) and the air cavity B (11) to have the same initial static pressure, driving force is applied to the piston and the connecting rod (6), the piston and the connecting rod (6) reciprocate in the cylinder (7), and pulsating pressure is generated at the pulsating pressure measuring port A (12) and the pulsating pressure measuring port B (13).
2. The gas pulsating pressure generation device as claimed in claim 1, wherein said end cap A (8) and end cap B (9) are connected to both ends of the cylinder (7), respectively.
3. The gas pulsating pressure generation device as claimed in claim 1, wherein the pulsating pressure measurement ports are as many as required and as many as required.
4. The gas pulsating pressure generation device as claimed in claim 1, wherein said gas pulsating pressure is generated by changing initial static pressures in the gas chamber a (10) and the gas chamber B (11) by the piston and the connecting rod (6) reciprocating in the axial direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810810909.1A CN108561370B (en) | 2018-07-23 | 2018-07-23 | Gas pulsating pressure generating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810810909.1A CN108561370B (en) | 2018-07-23 | 2018-07-23 | Gas pulsating pressure generating device |
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| CN108561370A CN108561370A (en) | 2018-09-21 |
| CN108561370B true CN108561370B (en) | 2020-06-16 |
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| CN111998996B (en) * | 2020-09-27 | 2021-10-15 | 中国航空工业集团公司北京长城计量测试技术研究所 | Bellows type gas pulsation pressure generator |
| CN114397060A (en) * | 2021-12-13 | 2022-04-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Piston type pulsating pressure generator with double-cavity cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1009214B (en) * | 1986-12-18 | 1990-08-15 | 国营机械和化学清洗锅炉联合工厂 | Hydraulic pulse generator |
| SE522165C2 (en) * | 2002-05-30 | 2004-01-20 | Cargine Engineering Ab | Method and apparatus for generating pressure pulses |
| CN102042895B (en) * | 2010-11-26 | 2013-03-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Sine pressure generator with differential piston |
| SE535886C2 (en) * | 2011-06-03 | 2013-02-05 | Ase Alternative Solar Energy Engine Ab | Pressure Pulse Generator |
| CN103362903A (en) * | 2012-04-10 | 2013-10-23 | 上海示才生物科技有限公司 | Low-frequency micro pulsating pressure generator |
| CN103712744B (en) * | 2014-01-10 | 2015-08-12 | 浙江大学 | Positive step force pilot system |
| CN203979003U (en) * | 2014-07-29 | 2014-12-03 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of high pressure cylinder for wind tunnel test |
| CN107227940B (en) * | 2016-03-25 | 2019-08-30 | 中国石油化工股份有限公司 | A kind of bidirectional pulse generator for underground |
| CN206159354U (en) * | 2016-11-16 | 2017-05-10 | 华东交通大学 | Twin coil magnetorheological valve accuse double acting cylinder damping system |
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