CN111927749B - Diaphragm compressor air pressure nondestructive monitoring system and method - Google Patents
Diaphragm compressor air pressure nondestructive monitoring system and method Download PDFInfo
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- CN111927749B CN111927749B CN202010675346.7A CN202010675346A CN111927749B CN 111927749 B CN111927749 B CN 111927749B CN 202010675346 A CN202010675346 A CN 202010675346A CN 111927749 B CN111927749 B CN 111927749B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
Abstract
The application belongs to the technical field of compressors, and particularly relates to a diaphragm compressor air pressure nondestructive monitoring system and method. Because the diaphragm compressor can be operated at a high pressure ratio and a wide pressure range, the highest exhaust pressure can reach 300MPa, and if a method of processing a pressure measuring hole on a cylinder body is adopted, the strength of the cylinder is influenced, and leakage can be caused, so that potential safety hazards are brought. The application provides diaphragm compressor atmospheric pressure nondestructive monitoring system, including the diaphragm subassembly, the blast pipe, the gas side cylinder head, strain flower circuit group, strain gauge circuit and data acquisition and processing subassembly, strain flower circuit subassembly is connected with data acquisition and processing subassembly, strain gauge circuit is connected with data acquisition and processing subassembly, the diaphragm subassembly is including the first diaphragm that arranges in proper order, second diaphragm and third diaphragm, strain flower circuit group includes first strain flower circuit, second strain flower circuit and third strain flower circuit. The operating health state of the diaphragm compressor can be monitored and diagnosed without damage.
Description
Technical Field
The application belongs to the technical field of compressors, and particularly relates to a diaphragm compressor air pressure nondestructive monitoring system and method.
Background
The diaphragm compressor is a special device for compressing gas without leakage in a compression cavity. Because the sealing performance provided by the gas compressor is good, the pressure range is wide, and the compression ratio is large, the gas compressor is widely applied to compressing and conveying various high-purity gases, precious rare gases, toxic and harmful gases and corrosive gases in the fields of hydrogenation stations and petrochemical industry. The diaphragm is the core part of the diaphragm compressor, the piston pushes working oil in the oil cavity of the cylinder, and then the diaphragm is pushed to reciprocate in the diaphragm cavity so as to change the working volume of the air cavity, and a leakage-free periodic working process is realized under the matching of the suction valve and the exhaust valve. In the high-pressure compression diaphragm compressor, a diaphragm serves as an isolator between hydraulic oil and compressed gas, and is a medium for coupling multiple physical fields of the hydraulic oil and the compressed gas, and the motion synchronization, momentum and energy transfer, heat conduction and the like between the hydraulic oil and the gas depend on the diaphragm.
The air pressure of the diaphragm compressor is a comprehensive reflection of the working performance and the running state of the compressor, and the air pressure curve of the working process of the diaphragm compressor can reflect the position of a piston, the time of an air suction process, the opening and closing actions of an air suction valve, the opening and closing actions of an exhaust valve and the time of an exhaust process, so that the air pressure is one of the most effective tools for diagnosing the faults of the diaphragm compressor, dynamic monitoring of the air pressure of the diaphragm compressor is an effective method for improving the running reliability and safety of equipment, and the monitoring of the running state of the equipment is also a strong demand of designers and users of the diaphragm compressor.
Because the diaphragm compressor can be operated at a high pressure ratio and a wide pressure range, the highest exhaust pressure can reach 300MPa, and if a method of processing a pressure measuring hole on a cylinder body is adopted, the strength of the cylinder is influenced, and leakage can be caused, so that potential safety hazards are brought.
Disclosure of Invention
1. Technical problem to be solved
Based on the fact that the diaphragm compressor is high in operable pressure ratio and wide in pressure range, the highest exhaust pressure can reach 300MPa, if a method of machining a pressure measuring hole in a cylinder body is adopted, the strength of an air cylinder is affected, leakage can be caused, and potential safety hazards are brought, the application provides a diaphragm compressor air pressure nondestructive monitoring system and a diaphragm compressor air pressure nondestructive monitoring method.
2. Technical scheme
In order to achieve the purpose, the application provides a diaphragm compressor air pressure nondestructive monitoring system, which comprises a diaphragm assembly, an exhaust pipe, an air side cylinder head, a strain relief circuit group, a strain relief circuit and a data acquisition and processing assembly, wherein the strain relief circuit assembly is connected with the data acquisition and processing assembly, the strain relief circuit is connected with the data acquisition and processing assembly, the diaphragm assembly comprises a first diaphragm, a second diaphragm and a third diaphragm which are sequentially arranged, and the strain relief circuit group comprises a first strain relief circuit, a second strain relief circuit and a third strain relief circuit;
the first strain pattern circuit comprises a first strain pattern component and a first bridge circuit group which are connected with each other, the first strain pattern component is arranged on the surface of the first membrane, the second strain pattern circuit comprises a second strain pattern component and a second bridge circuit group which are connected with each other, and the second strain pattern component is arranged on the surface of the third membrane; the strain gauge circuit comprises a strain gauge component and a third bridge type circuit group which are mutually connected, and the strain gauge component is arranged on the outer wall surface of the movable exhaust pipe; the third strain relief circuit comprises a third strain relief assembly and a fourth bridge circuit group which are connected with each other, and the third strain relief assembly is arranged on the air side cylinder head.
Another embodiment provided by the present application is: the first strain foil assembly comprises a first strain foil and a second strain foil, the first strain foil is connected with the second strain foil in a staggered mode, the first bridge circuit group comprises a first bridge circuit and a second bridge circuit, the first strain foil is connected with the first bridge circuit, and the second strain foil is connected with the second bridge circuit;
the second strain foil assembly comprises a third strain foil and a fourth strain foil, the third strain foil is connected with the fourth strain foil in a staggered mode, the second bridge type circuit group comprises a third bridge type circuit and a fourth bridge type circuit, the third strain foil is connected with the third bridge type circuit, and the fourth strain foil is connected with the fourth bridge type circuit;
the strain gauge assembly comprises a fifth strain gauge, the third bridge circuit group comprises a fifth bridge circuit, and the fifth strain gauge is connected with the fifth bridge circuit;
the third strain foil assembly comprises a sixth strain foil and a seventh strain foil, the fourth bridge circuit group comprises a sixth bridge circuit and a seventh bridge circuit, the sixth strain foil is connected with the sixth bridge circuit, and the seventh strain foil is connected with the seventh bridge circuit.
Another embodiment provided by the present application is: the first strain gauge and the second strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the first diaphragm, the third strain gauge and the fourth strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the third diaphragm, and the sixth strain gauge and the seventh strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the air-side cylinder head.
Another embodiment provided by the present application is: the first bridge circuit is an 1/4 bridge circuit, the second bridge circuit is an 1/4 bridge circuit, the third bridge circuit is an 1/4 bridge circuit, the fourth bridge circuit is an 1/4 bridge circuit, the fifth bridge circuit is an 1/4 bridge circuit, the sixth bridge circuit is a 1/4 bridge circuit, and the seventh bridge circuit is an 1/4 bridge circuit.
Another embodiment provided by the present application is: the second diaphragm includes the scale mark district, first diaphragm includes first portion of pasting, first portion of pasting with the scale mark district corresponds the setting, the third diaphragm includes the second portion of pasting, the third portion of pasting with the scale mark district corresponds the setting, first strain flower circuit is pasted first portion of pasting, second strain flower circuit pastes in second portion of pasting.
Another embodiment provided by the present application is: the first strain flower assembly is connected with the first bridge circuit group sequentially through the reticle, the gas collecting cavity and the gas collecting cavity channel of the second diaphragm, and the second strain flower assembly is connected with the second bridge circuit group sequentially through the reticle, the gas collecting cavity and the gas collecting cavity channel of the second diaphragm.
Another embodiment provided by the present application is: the data acquisition and processing assembly comprises a photoelectric sensing unit and a signal acquisition unit, the photoelectric sensing unit comprises a flywheel, the flywheel is correspondingly arranged with a photoelectric sensor, the signal acquisition unit is connected with the first strain rosette assembly, the signal acquisition unit is connected with the second strain rosette assembly, the signal acquisition unit is connected with the third strain rosette assembly, and the signal acquisition unit is connected with the photoelectric sensor; the signal acquisition unit is connected with the data processing unit.
The application also provides a diaphragm compressor air pressure nondestructive monitoring method, which comprises the following steps:
and 3, processing the second digital signal, the third digital signal, the fourth digital signal and the fifth digital signal according to the starting and stopping time of the complete cycle.
Another embodiment provided by the present application is: the step 3 comprises the following steps:
and respectively calculating the strain of the first diaphragm and the strain of the third diaphragm according to the measured voltage signals: calculating the oil/gas side pressure difference: calculating the oil pressure in the cylinder: calculating exhaust pressure: and finally, calculating the air pressure.
Another embodiment provided by the present application is: the strain calculation formula is as follows:
wherein theta represents a crank angle (0-360 degrees), E (theta) is a digital signal, v is a Poisson's ratio, E is an elastic modulus, and K issIs the strain gage sensitivity coefficient.
3. Advantageous effects
Compared with the prior art, the diaphragm compressor atmospheric pressure nondestructive monitoring system that this application provided has:
the application provides a diaphragm compressor air pressure nondestructive monitoring system, which is a diaphragm compressor air pressure nondestructive monitoring method and system, and realizes diaphragm compressor air pressure monitoring during the operation of the diaphragm compressor.
The application provides a diaphragm compressor air pressure nondestructive monitoring system, and provides a diaphragm compressor air pressure nondestructive monitoring method and system, and during the operation of the diaphragm compressor, dynamic air pressure monitoring is realized, and further, the operation health state nondestructive monitoring and diagnosis of the diaphragm compressor are realized.
Drawings
FIG. 1 is a schematic view of a first configuration of a non-destructive diaphragm compressor pressure monitoring system of the present application;
FIG. 2 is a second schematic view of the diaphragm compressor non-destructive pressure monitoring system of the present application;
FIG. 3 is a schematic diagram of the overall structure of the diaphragm compressor pressure nondestructive monitoring system of the present application;
FIG. 4 is a first schematic view of the present application of an exhaust pipe outer wall strain rosette attachment location;
FIG. 5 is a second schematic view of the present application showing the position of strain gage attachment to the outer wall of the exhaust pipe;
FIG. 6 is a schematic view of the gas side cylinder head strain relief application position of the present application;
FIG. 7 is a schematic diagram of a non-destructive monitoring system for diaphragm compressor pressure according to the present application;
FIG. 8 is a schematic diagram of a strain gage connection 1/4 bridge of the present application;
in the figure: 1-a first diaphragm, 2-a second diaphragm, 3-a third diaphragm, 4-a first strain rosette assembly, 5-a second strain rosette assembly, 6-a carved line area, 7-a gas collecting cavity, 8-a gas collecting cavity channel, 9-an exhaust pipe, 10-a strain rosette assembly, 11-a gas side cylinder head, 12-a third strain rosette assembly, 13-a signal acquisition unit, 14-a flywheel, 15-a photoelectric sensor and 16-a data processing unit.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
Strain roses are a term used for two or more strain gauges closely arranged to measure strain in different directions of a member. The single strain gauge can only measure the strain in a single direction, and the strain gauge can measure the strain in multiple directions by using multiple strain gauges, so that the strain of the measured surface can be measured more accurately.
Referring to fig. 1 to 8, the application provides a diaphragm compressor air pressure nondestructive monitoring system, which includes a diaphragm assembly, an exhaust pipe 9, an air side cylinder head 11, a strain relief circuit group, a strain relief circuit and a data acquisition and processing assembly, wherein the strain relief circuit assembly is connected with the data acquisition and processing assembly, the strain relief circuit is connected with the data acquisition and processing assembly, the diaphragm assembly includes a first diaphragm 1, a second diaphragm 2 and a third diaphragm 3 which are sequentially arranged, and the strain relief circuit group includes a first strain relief circuit, a second strain relief circuit and a third strain relief circuit;
the first strain flower circuit comprises a first strain flower component 4 and a first bridge circuit group which are connected with each other, the first strain flower component 4 is arranged on the surface of the first membrane 1 and close to the surface of one side of the second membrane 2, the second strain flower circuit comprises a second strain flower component 5 and a second bridge circuit group which are connected with each other, and the second strain flower component is arranged on the surface of the third membrane 3; the surface near the side of the second membrane 2,
the strain gauge circuit comprises a strain gauge component 10 and a third bridge type circuit group which are connected with each other, wherein the strain gauge component 10 is arranged on the outer wall surface of the movable exhaust pipe 9;
the third strain relief circuit comprises a third strain relief assembly 12 and a fourth bridge circuit group which are connected with each other, and the third strain relief assembly 12 is arranged on the gas-side cylinder head 11.
Here, the first membrane 1 is a gas-side membrane, the second membrane 2 is an intermediate membrane, and the third membrane 3 is an oil-side membrane. The three diaphragms are clamped by an oil side cylinder cover and an air side cylinder cover along the periphery, the oil cavities and the air cavities are tightly attached without relative movement in the operation process of the three diaphragms.
Further, the first strain gauge assembly 4 comprises a first strain gauge and a second strain gauge, the first strain gauge and the second strain gauge are connected in a staggered manner, the first bridge circuit group comprises a first bridge circuit and a second bridge circuit, the first strain gauge is connected with the first bridge circuit, and the second strain gauge is connected with the second bridge circuit;
the second strain foil assembly 5 comprises a third strain foil and a fourth strain foil, the third strain foil and the fourth strain foil are connected in a staggered mode, the second bridge type circuit group comprises a third bridge type circuit and a fourth bridge type circuit, the third strain foil is connected with the third bridge type circuit, and the fourth strain foil is connected with the fourth bridge type circuit;
the strain gauge assembly 10 comprises a fifth strain gauge, the third bridge circuit group comprises a fifth bridge circuit, and the fifth strain gauge is connected with the fifth bridge circuit;
the third strain foil assembly 12 comprises a sixth strain foil and a seventh strain foil, the sixth strain foil is connected with the seventh strain foil in a staggered manner, the fourth bridge circuit group comprises a sixth bridge circuit and a seventh bridge circuit, the sixth strain foil is connected with the sixth bridge circuit, and the seventh strain foil is connected with the seventh bridge circuit.
Further, the first strain gauge and the second strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the first diaphragm, the third strain gauge and the fourth strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the third diaphragm, and the sixth strain gauge and the seventh strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the air-side cylinder head.
Further, the first bridge circuit is an 1/4 bridge circuit, the second bridge circuit is an 1/4 bridge circuit, the third bridge circuit is an 1/4 bridge circuit, the fourth bridge circuit is an 1/4 bridge circuit, the fifth bridge circuit is a 1/4 bridge circuit, the sixth bridge circuit is a 1/4 bridge circuit, and the seventh bridge circuit is an 1/4 bridge circuit.
Of course, other bridge circuits are possible, such as 1/4, 1/2 and full bridge, which are commonly used.
Further, second diaphragm 2 includes scale line district 6, first diaphragm 1 includes first portion of pasting, first portion of pasting with scale line district 6 corresponds the setting, third diaphragm 3 includes the second portion of pasting, the third portion of pasting with scale line district 6 corresponds the setting, first strainly flower circuit is pasted first portion of pasting, second strainly flower circuit pastes in the second portion of pasting.
Further, the first strain rosette assembly 4 is connected with the first bridge circuit group sequentially through the scribing line, the gas collecting cavity 7 and the gas collecting cavity channel 8 of the second diaphragm 2, and the second strain rosette assembly 5 is connected with the second bridge circuit group sequentially through the scribing line, the gas collecting cavity 7 and the gas collecting cavity channel 8 of the second diaphragm 2.
Further, the data acquisition processing assembly comprises a photoelectric sensing unit and a signal acquisition unit 13, the photoelectric sensing unit comprises a flywheel 14, the flywheel 14 is correspondingly arranged with a photoelectric sensor 15, the signal acquisition unit 13 is connected with the first strain flower assembly 4, the signal acquisition unit 13 is connected with the second strain flower assembly 5, the signal acquisition unit 13 is connected with the strain flower assembly 10, the signal acquisition unit 13 is connected with the third strain flower assembly 12, and the signal acquisition unit 13 is connected with the photoelectric sensor 15; the signal acquisition unit 13 is connected with a data processing unit 16.
The application also provides a diaphragm compressor air pressure nondestructive monitoring method, which comprises the following steps:
and 3, processing the second digital signal, the third digital signal, the fourth digital signal and the fifth digital signal according to the starting and stopping time of the complete cycle.
Further, the step 3 comprises: and respectively calculating the strain of the first diaphragm and the strain of the third diaphragm according to the measured voltage signals: calculating the oil/gas side pressure difference: calculating the oil pressure in the cylinder: calculating exhaust pressure: and finally, calculating the air pressure.
Further, the strain calculation formula is:
wherein theta represents a crank angle (0-360 degrees), E (theta) is a digital signal, v is a Poisson's ratio, E is an elastic modulus, and K issIs the strain gage sensitivity coefficient.
Examples
a. Constructing a diaphragm strain measurement system
(1) Selecting a proper strain gauge type according to the material of the diaphragm, the radial scale line size of the middle diaphragm, the material of the exhaust pipe and the size of the exhaust pipe;
(2) 2 strain flowers are stuck on the membrane. Each strain flower comprises 2 strain pieces which are vertically arranged, and the strain pieces are respectively stuck to the areas of the gas-side diaphragm and the oil-side diaphragm corresponding to the radial scribed lines of the middle diaphragm along the radial direction and the circumferential direction. In order to prevent the 2 strain gauges from contacting with the movement of the diaphragm due to the thickness of the 2 strain gauges, the 2 strain gauges are required to be stuck in a staggered mode; the line of the strain gauge penetrates out through the middle diaphragm scribed line, the gas collection cavity and the gas collection cavity channel;
(3) sticking 1 strain gauge on the outer wall surface of the exhaust pipe along the circumferential direction for monitoring the exhaust pressure;
(4) pasting strain rosettes on the cylinder head at the gas side, wherein one piece of 2 strain foils in the strain rosettes is along the radial direction of the cylinder cover, and the other piece of the 2 strain foils is along the circumferential direction of the cylinder cover;
(5) the bridge is connected. Constructing a bridge circuit by adopting an 1/4 method, and respectively connecting 5 strain gauges including 2 strain gauges and 1 strain gauge with 5 bridges;
(6) a photoelectric sensor 15 is arranged at the flywheel, and the initial value 0 of the crank angle theta of the compressor is determined according to the obtained outer dead center signal;
(7) and a signal acquisition unit 13 is configured, and comprises an acquisition card and a signal conditioning module, and the data sampling frequency and the corresponding acquisition channel are set.
b. Signal acquisition
And c, acquiring a voltage signal generated by a strain gauge circuit in the measuring system according to the preset parameters in the step a. (5). The analog signal output by the circuit is converted into the finally required digital signal by the signal acquisition unit 13 and stored in the hard disk of the computer for subsequent analysis and processing. The computer stores data, runs a data acquisition program, and controls signal sampling and display, such as setting sampling frequency and sample storage length. The signal acquisition unit 13 realizes a series of functions of signal filtering, amplification, conditioning and A/D conversion.
c. Data processing
(1) According to the measured voltage data, the strain of the oil/gas side diaphragm is respectively calculated:
wherein theta represents a crank angle (0-360 degrees), E (theta) is an acquired voltage signal, v is a Poisson ratio, E is an elastic modulus, and K issIs the sensitivity coefficient of strain gauge, epsilonroil(theta) and epsilonrgas(theta) represents the radial strain of the oil/gas side diaphragm, respectively,. epsilonθoil(theta) and epsilonθgas(θ) represents the oil/gas side diaphragm circumferential strain, respectively. When any side diaphragm breaks, the structural integrity of the diaphragm is damaged, and the strain parameter changes, so that the nondestructive monitoring of the diaphragm breaking fault is realized.
(2) Calculating the oil/gas side pressure difference:
in the operation process of the diaphragm compressor, the three diaphragms are attached together to do reciprocating motion in the diaphragm cavity under the drive of oil/air pressure difference, the diaphragms are simplified into thin round flat plate models subjected to uniformly distributed loads, and calculation is performed:
taking the strain rosette pasted on the oil side membrane as an example, the pasting position of the strain rosette is (the distance from the center of the membrane is r)oil) The radial stress sigma of the diaphragm can be calculateddiarAnd the circumferential stress σdiaθAnd further, calculating the boundary condition of the peripheral solid support flat plate with uniformly distributed loads according to the structure of the diaphragm compressor, and calculating the oil/air pressure difference delta p according to the strain of the oil side diaphragm.
(3) Calculating the oil pressure in the cylinder:
simplifying the cylinder head at the air side into a circular flat plate model, and calculating to obtain the stress sigma of the working strain foil sticking position of the cylinder head at the air siderAnd σθIn which epsilonrFor radial strain,. epsilonθIs strain in the circumferential direction,. epsilonr＝ε3r,εθ＝ε3θThe distance from the center of the cylinder head is r3(ii) a Calculating the radial stress sigma of the cylinder head according to the generalized Hooke's lawcylrAnd the circumferential stress σcylθAnd then the in-cylinder oil pressure p is calculatedoil
(4) Calculating exhaust pressure:
the pipeline generates stress under the action of internal pressure, and a thick-wall cylinder stress analysis die is adoptedCalculating the pressure p in the tubed
(5) Calculating the air pressure:
fig. 7 is a specific data acquisition process, in which analog signals output by the strain gauge and the photoelectric sensor 15 are converted into finally required digital signals by a data acquisition system, and the finally required digital signals are stored in the data processing unit 16, i.e., a computer hard disk, for subsequent analysis and processing. The computer stores data, runs a data acquisition program, and controls signal sampling and display, such as setting sampling frequency and sample storage length. The data acquisition system realizes a series of functions of signal filtering, amplification, conditioning and A/D conversion.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (8)
1. The utility model provides a diaphragm compressor atmospheric pressure nondestructive monitoring system which characterized in that: the device comprises a diaphragm assembly, an exhaust pipe, a gas side cylinder head, a strain relief circuit group, a strain gauge circuit and a data acquisition and processing assembly, wherein the strain relief circuit assembly is connected with the data acquisition and processing assembly, the strain gauge circuit is connected with the data acquisition and processing assembly, the diaphragm assembly comprises a first diaphragm, a second diaphragm and a third diaphragm which are sequentially arranged, and the strain relief circuit group comprises a first strain relief circuit, a second strain relief circuit and a third strain relief circuit;
the first strain pattern circuit comprises a first strain pattern component and a first bridge circuit group which are connected with each other, the first strain pattern component is arranged on the surface of the first membrane, the second strain pattern circuit comprises a second strain pattern component and a second bridge circuit group which are connected with each other, and the second strain pattern component is arranged on the surface of the third membrane;
the strain gauge circuit comprises a strain gauge component and a third bridge type circuit group which are mutually connected, and the strain gauge component is arranged on the outer wall surface of the exhaust pipe;
the third strain relief circuit comprises a third strain relief assembly and a fourth bridge circuit group which are connected with each other, and the third strain relief assembly is arranged on the air side cylinder head; the second diaphragm comprises a scribing area, the first diaphragm comprises a first pasting part, the first pasting part is arranged corresponding to the scribing area, the third diaphragm comprises a second pasting part, the second pasting part is arranged corresponding to the scribing area, the first strain flower circuit is pasted on the first pasting part, and the second strain flower circuit is pasted on the second pasting part;
the first strain flower assembly is connected with the first bridge circuit group sequentially through the reticle, the gas collecting cavity and the gas collecting cavity channel of the second diaphragm, and the second strain flower assembly is connected with the second bridge circuit group sequentially through the reticle, the gas collecting cavity and the gas collecting cavity channel of the second diaphragm.
2. The system for nondestructive monitoring of diaphragm compressor gas pressure of claim 1 wherein: the first strain foil assembly comprises a first strain foil and a second strain foil, the first strain foil is connected with the second strain foil in a staggered mode, the first bridge circuit group comprises a first bridge circuit and a second bridge circuit, the first strain foil is connected with the first bridge circuit, and the second strain foil is connected with the second bridge circuit;
the second strain foil assembly comprises a third strain foil and a fourth strain foil, the third strain foil is connected with the fourth strain foil in a staggered mode, the second bridge type circuit group comprises a third bridge type circuit and a fourth bridge type circuit, the third strain foil is connected with the third bridge type circuit, and the fourth strain foil is connected with the fourth bridge type circuit;
the strain gauge assembly comprises a fifth strain gauge, the third bridge circuit group comprises a fifth bridge circuit, and the fifth strain gauge is connected with the fifth bridge circuit;
the third strain foil assembly comprises a sixth strain foil and a seventh strain foil, the sixth strain foil is connected with the seventh strain foil in a staggered mode, the fourth bridge circuit group comprises a sixth bridge circuit and a seventh bridge circuit, the sixth strain foil is connected with the sixth bridge circuit, and the seventh strain foil is connected with the seventh bridge circuit.
3. The system for nondestructive monitoring of diaphragm compressor gas pressure of claim 2 wherein: the first strain gauge and the second strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the first diaphragm, the third strain gauge and the fourth strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the third diaphragm, and the sixth strain gauge and the seventh strain gauge are perpendicular to each other and respectively extend along the radial direction and the circumferential direction of the air-side cylinder head.
4. The system for nondestructive monitoring of diaphragm compressor gas pressure of claim 2 wherein: the first bridge circuit is an 1/4 bridge circuit, the second bridge circuit is an 1/4 bridge circuit, the third bridge circuit is an 1/4 bridge circuit, the fourth bridge circuit is an 1/4 bridge circuit, the fifth bridge circuit is an 1/4 bridge circuit, the sixth bridge circuit is a 1/4 bridge circuit, and the seventh bridge circuit is an 1/4 bridge circuit.
5. The system for nondestructive monitoring of diaphragm compressor gas pressure of claim 1 wherein: the data acquisition and processing assembly comprises a photoelectric sensing unit and a signal acquisition unit, the photoelectric sensing unit comprises a flywheel, the flywheel is correspondingly arranged with a photoelectric sensor, the signal acquisition unit is connected with the first strain rosette assembly, the signal acquisition unit is connected with the second strain rosette assembly, the signal acquisition unit is connected with the third strain rosette assembly, and the signal acquisition unit is connected with the photoelectric sensor; the signal acquisition unit is connected with the data processing unit.
6. A nondestructive monitoring method for air pressure of a diaphragm compressor is applied to the nondestructive monitoring system for air pressure of a diaphragm compressor in any one of claims 1 to 5, and is characterized in that: the method comprises the following steps:
step 1, synchronously acquiring a first voltage signal output by a photoelectric sensor, a second voltage signal output by a first strain relief circuit, a third voltage signal output by a second strain relief circuit, a fourth voltage signal output by a strain gauge circuit and a fifth voltage signal output by a third strain relief circuit through a signal acquisition unit, simultaneously converting the first voltage signal into a first digital signal for storage, converting the second voltage signal into a second digital signal for storage, converting the third voltage signal into a third digital signal for storage, converting the fourth voltage signal into a fourth digital signal for storage, and converting the fifth voltage signal into a fifth digital signal for storage;
step 2, judging the start-stop time of a complete period according to the first digital signal;
and 3, processing the second digital signal, the third digital signal, the fourth digital signal and the fifth digital signal according to the starting and stopping time of the complete cycle.
7. The method for non-destructive monitoring of the gas pressure in a diaphragm compressor as set forth in claim 6, wherein: the step 3 comprises the following steps:
and respectively calculating the strain of the first diaphragm and the strain of the third diaphragm according to the measured voltage signals: calculating the oil/gas side pressure difference: calculating the oil pressure in the cylinder: calculating exhaust pressure: and finally, calculating the air pressure.
8. The method for non-destructive monitoring of the gas pressure in a diaphragm compressor as set forth in claim 6, wherein: the strain calculation formula is as follows:
wherein the content of the first and second substances,
representing a crank angle (0 to 360 °),
in the form of a digital signal, the signal is,
in order to obtain the poisson ratio,
in order to be the modulus of elasticity,
is the strain gage sensitivity coefficient.
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| CN114320827B (en) * | 2021-11-19 | 2022-10-25 | 西安交通大学 | Nondestructive monitoring device and method for indicator diagram of liquid-driven piston compressor |
| CN116591949B (en) * | 2023-07-18 | 2023-10-03 | 合肥通用机械研究院有限公司 | Non-invasive type air pressure monitoring device and monitoring method for high-pressure diaphragm compressor |
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