CN2378728Y - Pressure gage for air cylinder of diesel engine - Google Patents
Pressure gage for air cylinder of diesel engine Download PDFInfo
- Publication number
- CN2378728Y CN2378728Y CN 99237925 CN99237925U CN2378728Y CN 2378728 Y CN2378728 Y CN 2378728Y CN 99237925 CN99237925 CN 99237925 CN 99237925 U CN99237925 U CN 99237925U CN 2378728 Y CN2378728 Y CN 2378728Y
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- sensor
- diesel engine
- charge amplifier
- pressure
- utility
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Abstract
The utility model relates to a pressure gauge for a cylinder of a diesel engine, which mainly solves the defects of low measurement accuracy, poor reliability, etc. existing in the prior art. The utility model comprises a gauge body and a sensor, wherein, the gauge body is provided with a circuit board which is provided with a charge amplifier, a low pass filter, a peak retainer, a select switch, an A/D converter, an LCD display and a mean circuit, and the sensor is a circular piezoelectric sensor which is connected with the input terminal of the charge amplifier. The utility model can measure the maximum explosion pressure and the average pressure of the gas in the cylinder of the diesel engine.
Description
The utility model relates to a kind of device of measuring interior the highest explosion pressure of gas of cylinder of diesel engine and mean pressure.
Current, the major equipment that big-and-middle-sized cylinder of diesel engine internal pressure is measured is by mechanical type top pressure table, spring indicator and the measuring system be made up of water-cooled diaphragm type piezoelectric ceramics pressure transducer or C-sensor and single-chip microcomputer.But they have the following disadvantages: it is undesired that mechanical type top pressure table retaining valve is worked under the high-temperature fuel gas effect, makes that the reading error of mechanical type top pressure table is too big in the practicality, can only be used for qualitative analysis, and continuous working at high temperature; Mean pressure can not directly be measured by spring indicator, and spring rate descends easily; In recent years, a kind of Artificial Intelligence Instrument that the cylinder of diesel engine internal pressure changes of measuring occurs, adopt diaphragm type piezoelectric ceramics pressure transducer, because diaphragm is short fatigue lifetime, and this quasi-instrument is on the high side, is unfavorable for popularizing; Though the C-sensor has solved diaphragm type piezoelectric ceramics pressure transducer diaphragm short problem fatigue lifetime, but, the C-sensor bulk is big (the circumference external diameter is greater than 60mm) too, natural frequency is low (to be calculated according to us, the C-sensor has the bigger natural frequency of a pair of measurement influence near 300HZ), influence measuring accuracy, the measuring accuracy of middle high speed diesel engine cylinder internal procedure particularly, and be not easy on diesel engine, install.
The purpose of this utility model is to provide the interior the highest explosion pressure of gas of kinetic measurement cylinder of diesel engine of a kind of measuring accuracy height, good reliability and the device of mean pressure.
The purpose of this utility model is achieved in that it includes table body and sensor, be provided with circuit board in the table body, which is provided with charge amplifier, low-pass filter, peak-holding circuit, selector switch, A/D converter, LCD display, average circuit, it is characterized in that: above-mentioned said sensor is a kind of ring piezoelectric formula sensor, and it and charge amplifier input end join.
In the above-mentioned said piezoelectric transducer, a loop sensor body 7 is arranged, the one side is by two a pair of piezoelectric sensors 8 of screw clamping, be provided with heart electrode 9 between two sensitive elements 8, be provided with insulating sheath 10 in sensitive element 8 peripheries, sensor body 7 sides or end face are established binding post 11, and heart electrode 9 joins by binding post 11 usefulness leads and the input end of showing the charge amplifier in the body.
Above-mentioned said piezoelectric transducer and other parts constitute a sensor module, wherein, sensor 6 is arranged on the heating radiator 2, the center of heating radiator 2 is provided with gas passage, the below of heating radiator 2 joins by the axle 3 of screw thread and a hollow, axle 3 is provided with a threaded connector 5 that is connected with the quick-fried valve of inspection, and the top of threaded connector 5 is provided with a handwheel 4, and the upper end of sensor 6 joins by signal wire and charge amplifier input end.
Advantage of the present utility model is measuring accuracy height, good reliability.The Cylinder Pressure of Diesel Engine table that its adopts annular pressure sensor and secondary instrument composition all is better than foregoing various instrument at aspects such as high temperature resistant, temperature drift and fatigue lifetives, and the utility model integrates top pressure table and average tensimeter, measurement numerical value is accurate, easy to operate, can work long hours, cost is lower, is the upgraded product of mechanical type top pressure table and mechanical type mean pressure table.
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is two kinds of outward appearance connected mode synoptic diagram of the present utility model.
Fig. 2 is the structural representation of the sensor module in the utility model.
Fig. 3 is the structural representation of the ring piezoelectric formula pressure transducer 6 among Fig. 2.
Fig. 4 is the circuit block diagram in the utility model.
Fig. 5 is the utility model table dignity plate structure synoptic diagram.
Fig. 6 is a circuit diagram of the present utility model.
More than structure shown in the drawings be embodiment of the present utility model.Each circuit in the circuit block diagram is prior art, all is the circuit of existing conventional, then can select for use from the circuit design handbook, so do not repeat them here.Unique distinction of the present utility model is to have adopted ring piezoelectric formula pressure ceramic sensor, it has constituted sensor module jointly with relevant parts, and this assembly is made up of the axle 3 of insulating sheath 1, heating radiator 2, hollow, adiabatic handwheel 4, the threaded connector 5, the ring piezoelectric formula pressure transducer 6 that are connected with the quick-fried valve of inspection.Ring piezoelectric formula pressure transducer 6 is made up of loop sensor body 7, sensitive element 8, heart electrode 9, core insulation sheath 10, binding post 11.Gaseous tension acts on the inwall on the annular pressure sensor body 7 in the cylinder of diesel engine, piezoelectric ring transducer 6 converts gaseous tension to charge signal, pass to the secondary instrument that each circuit and panel component are formed through lead, the external cylindrical surface place that piezoelectric type sensitive elements 8 correspondences are installed at loop sensor body 7 cuts a part of material or spron is set.Binding post can be located at loop sensor body 7 external cylindrical surface places, along loop sensor body radial arrangement, also can be arranged on the end face of loop sensor body 7, is axial arranged, and sensitive element adopts installed under prestressing.The utility model panel 12 is provided with parts such as LCD display 13, power switch 14, selector switch 15, self check button 6, data latching button 17, reset key 18.Can form one (as the left figure of Fig. 1) with pressure sensor assembly by the secondary instrument that circuit and machine shell panel are formed, also can divide system, both be coupled together (as the right figure of Fig. 1) by signal wire.When secondary instrument and pressure sensor assembly are formed one, vibration isolation and heat insulating element (as steel-wire isolator etc.) can be set at secondary instrument and sensor module.
Claims (3)
1, a kind of Cylinder Pressure of Diesel Engine table, include table body and sensor, be provided with circuit board in the table body, which is provided with charge amplifier, low-pass filter, peak-holding circuit, selector switch, A/D converter, LCD display, average circuit, it is characterized in that: above-mentioned said sensor is a kind of ring piezoelectric formula sensor, and it and charge amplifier input end join.
2, cylinder of diesel engine according to claim 1 pressure side table, it is characterized in that: in the above-mentioned said piezoelectric transducer, a loop sensor body (7) is arranged, the one side is by two a pair of piezoelectric sensors of screw clamping (8), be provided with heart electrode (9) between two sensitive elements (8), be provided with insulating sheath (10) in sensitive element (8) periphery, sensor body (7) side or end face are established binding post (11), and heart electrode (9) joins by the input end of binding post (11) with the interior charge amplifier of lead and table body.
3, Cylinder Pressure of Diesel Engine table according to claim 1 and 2, it is characterized in that: above-mentioned said piezoelectric transducer and other parts constitute a sensor module, wherein, sensor (6) is arranged on the heating radiator (2), the center of heating radiator (2) is provided with gas passage, the below of heating radiator (2) joins by the axle (3) of screw thread and a hollow, axle (3) is provided with a threaded connector (5) that is connected with the quick-fried valve of inspection, the top of threaded connector (5) is provided with a handwheel (4), and the upper end of sensor (6) joins by signal wire and charge amplifier input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99237925 CN2378728Y (en) | 1999-06-18 | 1999-06-18 | Pressure gage for air cylinder of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99237925 CN2378728Y (en) | 1999-06-18 | 1999-06-18 | Pressure gage for air cylinder of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2378728Y true CN2378728Y (en) | 2000-05-17 |
Family
ID=34025468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99237925 Expired - Fee Related CN2378728Y (en) | 1999-06-18 | 1999-06-18 | Pressure gage for air cylinder of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2378728Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404267A (en) * | 2015-07-31 | 2017-02-15 | 基斯特勒控股公司 | Pressure sensor |
-
1999
- 1999-06-18 CN CN 99237925 patent/CN2378728Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404267A (en) * | 2015-07-31 | 2017-02-15 | 基斯特勒控股公司 | Pressure sensor |
| CN106404267B (en) * | 2015-07-31 | 2020-08-07 | 基斯特勒控股公司 | Pressure sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |