CN108561370A - A kind of air pulsing pressure-generating device - Google Patents
A kind of air pulsing pressure-generating device Download PDFInfo
- Publication number
- CN108561370A CN108561370A CN201810810909.1A CN201810810909A CN108561370A CN 108561370 A CN108561370 A CN 108561370A CN 201810810909 A CN201810810909 A CN 201810810909A CN 108561370 A CN108561370 A CN 108561370A
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- China
- Prior art keywords
- pressure
- connecting rod
- air cavity
- piston
- fluctuation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F15B15/1428—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
- F15B15/1447—Pistons; Piston to piston rod assemblies
-
- 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
Landscapes
- 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 dynamic pressure generation techniques, are related to a kind of air pulsing pressure-generating device, including fluctuation pressure generating unit and static pressure adjust unit.Fluctuation pressure generating unit includes piston and connecting rod, cylinder and both ends end cap.Piston and connecting rod are cruciform symmetry structure, and connecting rod end stretches out both ends end cap.Cylinder is divided into air cavity A and air cavity B by piston and connecting rod.A pressure regulating hole is had on air cavity A and air cavity B.End cap is provided with fluctuation pressure measuring mouth.It includes pneumatic supply, flow control valve and two pressure regulator valves that static pressure, which adjusts unit,.The connection of one end and pneumatic supply of two pressure regulator valves, the other end are connect with two pressure regulating holes respectively.Apparatus of the present invention can adjust the initial static pressure of cylinder, and generate fluctuation pressure under a constant static-pressure, widen fluctuation pressure range.The double cavity structure of apparatus of the present invention design can effectively reduce connecting rod and move back and forth required driving force, the fluctuation pressure amplitude of bigger is obtained under identical driving force.
Description
Technical field
The invention belongs to dynamic pressure generation techniques, and in particular to a kind of wideband air pulsing pressure-generating device.
Background technology
Pressure measurement has extensive use in science and techniques of defence, industrial production and daily life.It needs to survey under different situations
The pressure magnitude and frequency of amount are different.It is tested in engine combustion, during wind tunnel test etc., pressure can be in certain numerical value
Lower pulsatile change.These pressure changes how accurately to be measured for optimizing engine parameter, its efficiency of combustion is improved, promotes wind-tunnel
The tools such as flow field quality have very great help.
It is moved back and forth in cylinder using piston and generates fluctuation pressure, be a kind of simple and practicable method.But due to work
When plug movement, the power that outside is applied on piston and connecting rod is limited.If it is intended in the case of initial static pressure superatmospheric
Fluctuation pressure is obtained, will be will increase using traditional structure and obtain fluctuation pressure signal difficulty and cost.Because piston both ends due to
Bias force caused by draught head can increase with the increase of initial static pressure, this makes for pushing piston and connecting rod back and forth to transport
The ratio of whole thrusts shared by dynamic effective push declines therewith, and the fluctuation pressure amplitude that device generates reduces.
Invention content
The present invention provides a kind of air pulsing pressure-generating devices, which can be in difference
Air pulsing pressure is generated under static pressure, and apparatus structure is simple, effectively reduces piston both ends due to caused by draught head
Bias force improves the ratio that effective push on piston and connecting rod accounts for gross thrust that acts on, increases fluctuation pressure amplitude, widen
Fluctuation pressure range reduces the difficulty and cost that air pulsing pressure is generated under high-pressure situations.
A kind of air pulsing pressure-generating device, including fluctuation pressure generating unit, static pressure adjust unit, the pulsating pressure
Power generating unit includes：Cylinder, piston and connecting rod and both ends end cap, wherein：
Cylinder is divided into air cavity A and air cavity B by the piston and connecting rod；
A pressure regulating hole is had on the air cavity A and air cavity B；
The piston and connecting rod is cruciform symmetry structure, and connecting rod end stretches out both ends end cap；
Fluctuation pressure measuring mouth is provided on the end cap, fluctuation pressure measuring mouth quantity, size are according to depending on demand；
It includes pneumatic supply and two pressure regulator valves that the static pressure, which adjusts unit,；
The pneumatic supply is connect with one end of two pressure regulator valves；
The other end of two pressure regulator valves is connect with the pressure regulating hole on air cavity A and air cavity B respectively.；
The static pressure, which adjusts unit, can control the initial static pressure of gas in air cavity A and chamber B.
The present invention has the following advantages：
Gas initial static pressure is adjustable in air cavity A and air cavity B；
Reciprocating motion of the pistons can generate air pulsing pressure under different static pressure；
Initial static pressure is identical in air cavity A and air cavity B, piston both ends due to caused by pressure difference bias force reduce, piston and
Connecting rod moves back and forth required driving force and reduces, and acts on the ratio increase that effective push on piston and connecting rod accounts for gross thrust, can
To generate the air pulsing pressure of bigger in fluctuation pressure measuring mouth；It is easily achieved the calibration of pressure sensor；
Depending on fluctuation pressure measuring mouth position can be according to actual conditions, for realizing pressure sensor absolute calibration or
Relative calibration；
Fluctuation pressure generating means overall structure is simple, can generate larger amplitude under a constant static-pressure using smaller thrust
The fluctuation pressure of value has widened fluctuation pressure range, reduces the cost of fluctuation pressure generating means.
Description of the drawings
Fig. 1 is the structural schematic diagram that fluctuation pressure measuring mouth of the present invention is located at both sides end cap.
Reference numeral：1, pneumatic supply, 2, pressure regulator valve, 3, pressure regulator valve, 4, pressure regulating hole, 5, pressure regulating hole, 6, piston
And connecting rod, 7, cylinder, 8, end cap, 9, end cap, 10, air cavity A, 11, air cavity B, 12, fluctuation pressure measuring mouth, 13, fluctuation pressure surveys
Measure mouth.
Specific implementation method
Below by way of examples and with reference to the accompanying drawings 1, technical scheme of the present invention is further illustrated.
Below by way of specific embodiment, the invention will be further described, but not to limit the present invention, all in the present invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Embodiment 1
Referring to Fig. 1, a kind of air pulsing pressure-generating device, including：
Fluctuation pressure generating unit, including piston and connecting rod 6, cylinder 7, end cap 8 and end cap 9.Piston and connecting rod 6 are by cylinder
7 are divided into air cavity A10 and air cavity B11.Piston is located at 7 centre position of cylinder, and air cavity A10 is identical with air cavity B11 volumes.Air cavity
Pressure regulating hole 4 is provided on A10；Pressure regulating hole 5 is provided on air cavity B11.The piston and connecting rod 6 is cruciform symmetry knot
Structure, connecting rod end stretch out end cap 8 and end cap 9 respectively.Fluctuation pressure measuring mouth 12 and pulsation are had on end cap 8 and end cap 9
Pressure measurement mouth 13.
Static pressure adjusts unit：Pneumatic supply 1, pressure regulator valve 2 and pressure regulator valve 3.Pneumatic supply 1 and pressure regulator valve 2 and pressure regulator valve 3
Air inlet connects.The gas outlet of pressure regulator valve 2 is connect with pressure regulating hole 4, and the gas outlet of pressure regulator valve 3 is connect with pressure regulating hole 5.
The size of fluctuation pressure measuring mouth 12 and fluctuation pressure measuring mouth 13 is matched with pressure sensor dimensions.By standard pressure
It force snesor and is respectively placed in fluctuation pressure measuring mouth 12 and fluctuation pressure measuring mouth 13, and carries out by correction force snesor
Sealing.Pressure regulator valve 2, pressure regulator valve 3 are opened, the initial static pressure of air cavity A10 and air cavity B11 is adjusted by pneumatic supply 1, is denoted as P0.It closes
Pressure regulator valve 2, pressure regulator valve 3 are closed, applies the reciprocating motion in cylinder 7 of driving force, piston and connecting rod 6 to piston and connecting rod 6, is pulsing
Pressure measurement mouth 12 and with fluctuation pressure measuring mouth 13 generate fluctuation pressure.
The air pulsing pressure-generating device basic principle is as follows：
The displacement of piston is：
S=l sin (ω t) (1)
The acceleration of piston is：
A=ω2l sin(ω·t) (2)
Pressure is at fluctuation pressure measuring mouth 12：
P1(t)≈P0[1+αsin(ω·t)] (3)
Pressure is at fluctuation pressure measuring mouth 13：
P2(t)≈P0[1-αsin(ω·t)] (4)
Dynamic and static pressure ratio：
The equation of motion of piston and connecting rod is：
F-Fdif=ma (6)
Inventive piston both ends are due to bias force caused by pressure difference：
Fdif=(P1(t)-P2(t))·S
=2 α sin (ω t) P0·S (7)
Traditional structure piston both ends are due to bias force caused by pressure difference：
F′dif=(P1(t)-Pref)·S
=(P0-Pref)·S+α·P0·sin(ω·t)·S (8)
In formula：
L- piston motion single peak；
ω-piston motion angular frequency；
P0Initial pressure in air cavity A10, air cavity B11；
PrefAtmospheric pressure；
L- air cavity A10 length；
The maximum thrust of piston and connecting rod is applied to outside F-；
The gross mass of m- pistons and connecting rod；
The attainable peak acceleration of a- pistons and connecting rod institute；
S- piston effective areas；
The pressure P generated at Fig. 1 fluctuation pressures measuring mouth 121(t) identical as the fluctuation pressure amplitude generated using structure.
Since the distance of piston motion is limited, for traditional structure, piston both ends draught head is mainly by initial pressure in cylinder
It is determined with the difference of atmospheric pressure.In the case where side face of piston ring product is certain, initial pressure is bigger in cylinder, the air pressure of piston both ends
Difference is bigger, and the bias force caused by pressure difference is bigger.And for the present apparatus, the draught head at piston both ends is mainly by gas
The product of initial pressure and dynamic and static pressure ratio determines in cylinder.For a given thrust and designed cylinder, pass through
Appropriate adjustment dynamic and static pressure ratio (i.e. piston motion distance) can reduce under different initial pressure due to being biased caused by pressure difference
Power.By comparison as can be seen that the present apparatus can substantially reduce the bias force caused by the draught head of piston both ends, greatly
The range that can be generated fluctuation pressure has been widened, the amplitude of fluctuation pressure is improved.The present apparatus can be in different initial static pressure items
The fluctuation pressure for generating higher magnitude under part using smaller thrust, reduces the cost for generating air pulsing pressure.It is pulsing
Pressure sensor is installed at pressure measurement mouth 12 and carries out sealing, using above-mentioned formula, absolute calibration can be carried out to sensor.
Embodiment 1 only illustrates a kind of fluctuation pressure measuring mouth situation, and pressure sensor may be implemented in the case of this
Absolute calibration.When being provided with fluctuation pressure measuring mouth centrosymmetric about connecting rod on a side end cap, standard can be utilized to pass
Sensor is realized relatively calibrated.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
Generation, but the spirit or beyond the scope defined by the appended claims of the present invention can not be deviateed.
Although more herein used pneumatic supply 1, pressure regulator valve 2, pressure regulator valve 3, pressure regulating hole 4, pressure regulating hole 5,
Piston and connecting rod 6, cylinder 7, end cap 8, end cap 9, fluctuation pressure measuring mouth 9, air cavity A10, air cavity B11, fluctuation pressure measuring mouth
12, the equal terms of fluctuation pressure measuring mouth 13, but the possibility using other terms is not precluded.Using these terms, be in order to
More easily describe and explain the essence of the present invention；They are construed to any one of the additional limitations it are and spirit of that invention
It disagrees.
Claims (9)
1. a kind of air pulsing pressure-generating device, which is characterized in that adjust unit including fluctuation pressure generating unit, static pressure.
2. air pulsing pressure-generating device according to claim 1, which is characterized in that the fluctuation pressure occurs single
Member includes piston and connecting rod (6), cylinder (7), end cap (8) and end cap (9).
3. fluctuation pressure generating unit according to claim 2, which is characterized in that the end cap (8) and end cap (9) point
It is not connected to cylinder (7) both ends.
4. piston according to claim 2 and connecting rod (6), which is characterized in that the piston and connecting rod (6) are cross pair
Claim structure, piston and connecting rod (6) that cylinder (7) is divided into air cavity A (10) and air cavity B (11), connecting rod two end stretches out end cap respectively
(8) and end cap (9).
5. air cavity A (10) according to claim 4 and air cavity B (11), which is characterized in that opened on the air cavity A (10)
There is pressure regulating hole (4), pressure regulating hole (5) is provided on air cavity B (11).
6. fluctuation pressure generating unit according to claim 2, which is characterized in that be provided with arteries and veins on end cap (8) and end cap (9)
Dynamic pressure measuring mouth, depending on quantity, size can be according to demands.
7. static pressure according to claim 1 adjusts unit, which is characterized in that it includes pneumatic supply that the static pressure, which adjusts unit,
(1), pressure regulator valve (2) and pressure regulator valve (3).One end of pressure regulator valve (2) and pressure regulator valve (3) is connect with pneumatic supply (1), other end difference
It is connect with pressure regulating hole (4) and pressure regulating hole (5).
8. static pressure according to claim 1 adjusts unit, which is characterized in that the static pressure adjusts unit and is used for adjusting gas
Initial static pressure in chamber A (10) and air cavity B (11).
9. air pulsing pressure-generating device according to claim 1, which is characterized in that the air pulsing pressure is
It is moved axially in reciprocal fashion by piston and connecting rod (6), the initial static pressure changed in air cavity A (10) and air cavity B (11) generates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810909.1A CN108561370B (en) | 2018-07-23 | 2018-07-23 | Gas pulsating pressure generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810909.1A CN108561370B (en) | 2018-07-23 | 2018-07-23 | Gas pulsating pressure generating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108561370A true CN108561370A (en) | 2018-09-21 |
| CN108561370B CN108561370B (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810810909.1A Active CN108561370B (en) | 2018-07-23 | 2018-07-23 | Gas pulsating pressure generating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108561370B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111998996A (en) * | 2020-09-27 | 2020-11-27 | 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111998996A (en) * | 2020-09-27 | 2020-11-27 | 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 | Publication date |
|---|---|
| CN108561370B (en) | 2020-06-16 |
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