CN201386646Y - Piston air refrigeration compressor indicator diagram testing device - Google Patents
Piston air refrigeration compressor indicator diagram testing device Download PDFInfo
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- CN201386646Y CN201386646Y CN200920032830U CN200920032830U CN201386646Y CN 201386646 Y CN201386646 Y CN 201386646Y CN 200920032830 U CN200920032830 U CN 200920032830U CN 200920032830 U CN200920032830 U CN 200920032830U CN 201386646 Y CN201386646 Y CN 201386646Y
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Abstract
The utility model discloses a piston air refrigeration compressor indicator diagram testing device which comprises a pressure detection unit, a rotary encoder, a control unit and a host computer. The pressure detection unit is used for detecting the internal pressure in a compressor air cylinder; the rotary encoder is arranged on a compressor crankshaft and can coaxially rotate with the compressor crankshaft; the control unit transmits the pressure signal sampled by the pressure detection unit to the host computer according to the acquisition sequence; the host computer is connected with the control unit; and the pressure detection unit and the rotary encoder are both connected with the control unit. The testing device has simple structure, rational design, and simple and convenient use and operation, also has the advantages of fast acquisition speed, accurate acquisition data, high test precision and real-time display.
Description
Technical field
The utility model relates to a kind of pressure test device, especially relates to a kind of piston type air refrigeration compressor indicator diagram testing device.
Background technique
Piston compressor is widely used a kind of universal machine in the modern industry, and can the fine or not direct relation auto levelizer of compressor performance proper functioning and the energy consumption situation of process.Indicator diagram is the concentrated expression of compressor operating situation and service behaviour, and the indicator diagram method is one of basic skills of research compressor performance and working state.Can make quantitative analysis to performance index such as the power loss of compressor, volumetric efficiency, indicated power by indicator diagram, simultaneously can be to the leakage of parts such as air valve, filler, piston ring, the pressure loss of inlet and outlet process and compression, inflation process heat exchange situation are made qualitatively and being estimated.Therefore, utilization modern detecting and computer on-line measurement compressor operating data, with indicator diagram method research compressor performance be a kind of directly, accurately, important means fast and effectively, the while can be carried out inline diagnosis and research to the compressor operating fault.
Current, the domestic and international testing apparatus of indicator diagram, commonly used have mechanical type, electronic type and a computer aided testing device.
Wherein, the mechanical type indicator diagram testing device is from textural two kinds of helical spring type and the rod springs that are divided into.In fact the pressure transferred structure of mechanical type testing apparatus is equivalent to an elastic oscillating system under periodicity gas force exciting; The stroke transfer mechanism is equivalent to a torsional vibration system under the periodic force effect.Therefore, this working process of mechanism is the synthetic of two vibration systems, but this kind system inertial error can occur in measuring phase, and compressor rotary speed can not be too high.To sum up, the mechanical type testing apparatus can not be used for accurately measuring indicator diagram, can only use in teaching as apparatus for demonstrating.
The electronic type indicator diagram testing device mainly partly is made up of sensor, amplifier and register etc.The variation of inner cylinder pressure, piston stroke or crank angle converts electric analogue signal to by sensor, and signal couples together with oscillograph, recorder etc. after overvoltage or electric current amplification, draws out the indicator diagram of compressor.The electronic type indicator diagram testing device can not only overcome machinery inertial and the distortion that produces, also has rapidly, advantage accurately.Except that sensor needed directly on compressor, other instruments all can be done telemeasurement by cable.
The area of computer aided indicator diagram testing device is development and come on the basis of electronic type testing apparatus, this test system is that the cylinder pressure signal that pressure transducer is gathered is passed through signal condition, and the digital signal after the conversion such as A/D converter is input to microcomputer.Microcomputer carries out analysing and processing, mapping, printing and data file storage to the data of gathering.The computer aided testing device is compared with the electronic type testing apparatus, but except that the advantage with telemeasurement, it is higher to measure efficient and measuring accuracy.
The model utility content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of piston type air refrigeration compressor indicator diagram testing device is provided, it is simple in structure, reasonable in design and use easy and simple to handlely, has simultaneously that picking rate is fast, image data is accurate, testing precision is high and advantage such as real-time demonstration.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of piston type air refrigeration compressor indicator diagram testing device is characterized in that: comprise pressure sensing cell that the compressor cylinder internal pressure is detected, be installed on the compressor crank shaft and with the rotating coder of described compressor crank shaft coaxial rotation with the pressure signal that described pressure sensing cell is sampled and be sent to the control unit of upper-position unit and the upper-position unit that joins with control unit by acquisition order; Described pressure sensing cell and rotating coder all join with control unit;
Described rotating coder is to have zero-crossing pulse output and can be according to the angle of swing and the period of rotation of described compressor crank shaft, correspondingly sends the sampling trigger impulse and the sampling period stopping pulse is 360 line rotating coders of piston stop pulse signal to control unit;
Described control unit is for according to zero-crossing pulse that rotating coder sent, sampling trigger impulse and sampling period stopping pulse signal, and corresponding in a sampling period described pressure sensing cell the sampling triggered the controller of control;
The pressure signal of described upper-position unit for sampling by acquisition order according to described pressure sensing cell, and in conjunction with the angle of swing of the described compressor crank shaft of each pressure signal correspondence, the computer that corresponding reckoning draws described compressor indicator diagram and shows in real time.
The dynamic pressure transducer of described pressure sensing cell for described cylinder internal pressure is detected is connected to A/D converter between described dynamic pressure transducer and control unit; The startup of A/D converter and stopping by control unit according to zero-crossing pulse and corresponding control of sampling period stopping pulse signal that rotating coder sent; Described dynamic pressure transducer by control unit according to corresponding control of sampling start pulse signal that rotating coder sent.
Be connected to photoelectric coupled circuit between described rotating coder and the control unit.
Described control unit is the ARM7 microcontroller.
Described A/D converter is 8 tunnel 10 successive approximation type a/d converters.
Be connected by serial ports RS 232 between described control unit and the upper-position unit.
The utility model compared with prior art has the following advantages: 1, simple in structure and use easy and simple to handle.2, rationally novel in design, the utility model belongs to a kind of area of computer aided indicator diagram testing device, its with ARM7 (the LPC2000 series of PHILIPS Co.) microcontroller as control core, with the cylinder pressure signal conversion of dynamic pressure transducer collection is to deliver to control unit after the digital signal, and the foundation differentiated as force samples trigger signal source and piston stop of the pulse signal that the rotary pulsed encoder of 360 lines is sent, it is upper-position unit that the pressure signal that control unit is sampled by acquisition order the most at last (being to have certain corresponding relation between the angle of swing of each pressure signal of being sampled and described compressor crank shaft) sends to PC by serial ports, draws indicator diagram by upper-position unit more at last and shows in real time.3, using effect is good, the utility model can detect unit to the one-level compression and the secondary compression pressure of piston type air refrigeration compressor cylinder, can test the cylinder pressure of two-stage piston type air refrigeration compressor, and detect that the back is analyzed on computers synchronously, shown, the pressure data of printing and storage of collected, draw indicator diagram and demonstration in real time.In addition, because this testing apparatus adopts ARM7 as the control core, and have 8 tunnel 10 successive approximation type a/d converters, 10 A/D conversion time is the fastest to reach 2.44 μ s, thereby the utility model has simultaneously that picking rate is fast, testing precision is high, image data is accurate and advantage such as real-time demonstration.4, convenient test, this testing apparatus can put together with tested compressor carries out on-the-spot test, also can carry out Distance Test.5, applied widely, can be applicable to do on the compressor Laboratory Furniture of each universities in the analysis experiment of indicator diagram, also can be applicable to factories such as oil, chemical industry, pharmacy carries out in the real-time check and analysis the operation conditions of compressor, can also apply to national defence and R﹠D institution in addition does in the research of compressor performance aspect, therefore, have very important practical value and application prospect.In sum, the utility model is simple in structure, reasonable in design and use easy and simple to handlely, has simultaneously that picking rate is fast, image data is accurate, testing precision is high and advantage such as real-time demonstration.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Description of reference numerals:
The 1-rotating coder; The 2-control unit; The 3-upper-position unit;
The 4-A/D transducer; The 5-photoelectric coupled circuit; The 6-dynamic pressure transducer.
Embodiment
As shown in Figure 1, the utility model comprises pressure sensing cell that the compressor cylinder internal pressure is detected, is installed on the compressor crank shaft and with the rotating coder 1 of described compressor crank shaft coaxial rotation, the pressure signal that described pressure sensing cell is sampled and is sent to the control unit 2 of upper-position unit 3 and the upper-position unit 3 that joins with control unit 2 by acquisition order.Described pressure sensing cell and rotating coder 1 all join with control unit 2.
Described rotating coder 1 is for having zero-crossing pulse output and can be according to the angle of swing and the period of rotation of described compressor crank shaft, correspondingly sends the sampling trigger impulse and the sampling period stopping pulse is 360 line rotating coders of piston stop pulse signal to control unit 2.
Zero-crossing pulse, sampling trigger impulse and the sampling period stopping pulse signal of described control unit 2 for being sent according to rotating coder 1, corresponding in a sampling period described pressure sensing cell the sampling triggered the controller of control.
The pressure signal of described upper-position unit 3 for sampling by acquisition order according to described pressure sensing cell, and in conjunction with the angle of swing of the described compressor crank shaft of each pressure signal correspondence, the computer that corresponding reckoning draws described compressor indicator diagram and shows in real time.
In the present embodiment, the dynamic pressure transducer 6 of described pressure sensing cell for described cylinder internal pressure is detected, 2 of described dynamic pressure transducer 6 and control units are connected to A/D converter 4.Zero-crossing pulse and corresponding control of sampling period stopping pulse signal that the startup of described A/D converter 4 and stopping to be sent according to rotating coder 1 by control unit 2.The corresponding control of sampling start pulse signal that described dynamic pressure transducer 6 is sent according to rotating coder 1 by control unit 2.Be connected to photoelectric coupled circuit 5 between described rotating coder 1 and the control unit 2, promptly the pulse signal exported of rotating coder 1 is delivered to control unit 2 after photoelectric coupled circuit 5.Described control unit 2 is the ARM7 microcontroller, and described A/D converter 4 is 8 tunnel 10 successive approximation type a/d converters.Be connected by serial ports RS2 32 between described control unit 2 and the upper-position unit 3.
To sum up, the utility model is installed in 360 line rotating coders on the described compressor crank shaft dexterously, because the cycle of motion of compressor crank shaft period of rotation and piston is synchronous, thereby can be to the piston motion position is accurately being measured by rotating coder 1, specifically be that the outer dead point (the zero-crossing pulse signal with rotating coder 1 is differentiated) from piston thinks that the corner of described compressor crank shaft is zero (α=0); After 1 ° of the compressor crank shaft rotation, rotating coder 1 has a pulse output and represents compressor crank shaft to rotate 1 ° with regard to corresponding; After the 360th pulse of rotating coder 1 output, illustrate that then compressor crank shaft has rotated a week, at this moment, the piston work cycle of also having moved is got back to outer dead point again, when piston was got back to outer dead point, the pulse signal of rotating coder 1 output was a piston stop pulse signal for the sampling period stopping pulse.
Because the sampling start pulse signal that control unit 2 is sent according to rotating coder 1, corresponding in a sampling period described pressure sensing cell the sampling triggered control, and then being equivalent to the sampling start pulse signal that rotating coder 1 sent is the force samples trigger signal source of described pressure sensing cell.That is to say when described pressure sensing cell depends on the pulse signal that rotating coder 1 is exported to described cylinder internal pressure measurement, and the two is corresponding one by one.
The test process of this testing apparatus is: at first, judge by control unit 2 whether the output of rotating coder 1 is zero-crossing pulse, after detecting zero-crossing pulse, the described pressure sensing cell of control unit 2 controls begins to gather pressure signal; Behind the pulse signal of an angle of rotating coder 1 output, described pressure sensing cell is gathered the several times pressure signal, afterwards with described several times pressure signal force value as this angle after Shelving, until the sampling of finishing a sampling period; And after the pressure signal of institute's collecting treatment ranked by the order of gathering, sending to PC by serial ports was upper-position unit 3, draws indicator diagram by PC again.In the signal sampling process, differentiate foundation with the pulse signal that rotating coder 1 is exported as force samples trigger signal source and piston stop, and piston stop signal be described piston stop pulse signal as switching value, the startup of control A/D converter 4 and sampling circuit stop.
Because period of rotation, the cycle of motion of piston and the sampling period unanimity of described pressure sensing cell of described compressor crank shaft, under described compressor steady operational status, the rotating speed of described compressor crank shaft also is at the uniform velocity, thereby the piston displacement of each sampled point can be calculated by the rotation angle of described compressor crank shaft, thereby can calculate the cylinder volume of each pressure signal sampled point correspondence, draw out thus and can draw out p (cylinder pressure value)-V (cylinder volume) and show the merit curve.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (6)
1. piston type air refrigeration compressor indicator diagram testing device is characterized in that: comprise pressure sensing cell that the compressor cylinder internal pressure is detected, be installed on the compressor crank shaft and with the rotating coder (1) of described compressor crank shaft coaxial rotation with the pressure signal that described pressure sensing cell is sampled and be sent to the control unit (2) of upper-position unit (3) and the upper-position unit (3) that joins with control unit (2) by acquisition order; Described pressure sensing cell and rotating coder (1) all join with control unit (2);
Described rotating coder (1) is for having zero-crossing pulse output and can be according to the angle of swing and the period of rotation of described compressor crank shaft, correspondingly sends the sampling trigger impulse and the sampling period stopping pulse is 360 line rotating coders of piston stop pulse signal to control unit (2);
Zero-crossing pulse, sampling trigger impulse and the sampling period stopping pulse signal of described control unit (2) for being sent according to rotating coder (1), corresponding in a sampling period described pressure sensing cell the sampling triggered the controller of control;
The pressure signal of described upper-position unit (3) for sampling by acquisition order according to described pressure sensing cell, and in conjunction with the angle of swing of the described compressor crank shaft of each pressure signal correspondence, the computer that corresponding reckoning draws described compressor indicator diagram and shows in real time.
2. according to the described piston type air refrigeration of claim 1 compressor indicator diagram testing device, it is characterized in that: the dynamic pressure transducer (6) of described pressure sensing cell for described cylinder internal pressure is detected is connected to A/D converter (4) between described dynamic pressure transducer (6) and control unit (2); Zero-crossing pulse and corresponding control of sampling period stopping pulse signal that the startup of A/D converter (4) and stopping to be sent according to rotating coder (1) by control unit (2); The corresponding control of sampling start pulse signal that described dynamic pressure transducer (6) is sent according to rotating coder (1) by control unit (2).
3. according to claim 1 or 2 described piston type air refrigeration compressor indicator diagram testing devices, it is characterized in that: be connected to photoelectric coupled circuit (5) between described rotating coder (1) and the control unit (2).
4. according to claim 1 or 2 described piston type air refrigeration compressor indicator diagram testing devices, it is characterized in that: described control unit (2) is the ARM7 microcontroller.
5. according to the described piston type air refrigeration of claim 2 compressor indicator diagram testing device, it is characterized in that: described A/D converter (4) is 8 tunnel 10 successive approximation type a/d converters.
6. according to claim 1 or 2 described piston type air refrigeration compressor indicator diagram testing devices, it is characterized in that: be connected by serial ports RS232 between described control unit (2) and the upper-position unit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032830U CN201386646Y (en) | 2009-04-28 | 2009-04-28 | Piston air refrigeration compressor indicator diagram testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032830U CN201386646Y (en) | 2009-04-28 | 2009-04-28 | Piston air refrigeration compressor indicator diagram testing device |
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| Publication Number | Publication Date |
|---|---|
| CN201386646Y true CN201386646Y (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920032830U Expired - Fee Related CN201386646Y (en) | 2009-04-28 | 2009-04-28 | Piston air refrigeration compressor indicator diagram testing device |
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| CN (1) | CN201386646Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862708A (en) * | 2012-12-14 | 2014-06-18 | 江苏沃得机电集团有限公司 | Display method for crankshaft rotation for press machine |
| CN103862709A (en) * | 2012-12-14 | 2014-06-18 | 江苏沃得机电集团有限公司 | Display system for crankshaft rotation for press machine |
| CN105889050A (en) * | 2015-04-14 | 2016-08-24 | 康茨（上海）压缩机技术服务有限公司 | Intelligent opening-closing control method for air valve of piston compressor |
| CN108131285A (en) * | 2017-12-26 | 2018-06-08 | 衢州市质量技术监督检测中心 | A kind of system and method for testing screw compressor work indicator card |
| CN108361188A (en) * | 2018-02-27 | 2018-08-03 | 奥克斯空调股份有限公司 | Compressor test method and system |
| CN110440719A (en) * | 2019-08-07 | 2019-11-12 | 中国北方发动机研究所(天津) | A kind of engine gudgeon pin rotation wireless test apparatus and test method |
| CN111980903A (en) * | 2020-07-30 | 2020-11-24 | 珠海格力电器股份有限公司 | Detection assembly for measuring pressure in pump body, detection assembly of compressor and compressor |
| CN112576491A (en) * | 2020-11-13 | 2021-03-30 | 珠海格力电器股份有限公司 | Signal acquisition system, compressor and air conditioner |
-
2009
- 2009-04-28 CN CN200920032830U patent/CN201386646Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862708A (en) * | 2012-12-14 | 2014-06-18 | 江苏沃得机电集团有限公司 | Display method for crankshaft rotation for press machine |
| CN103862709A (en) * | 2012-12-14 | 2014-06-18 | 江苏沃得机电集团有限公司 | Display system for crankshaft rotation for press machine |
| CN105889050A (en) * | 2015-04-14 | 2016-08-24 | 康茨（上海）压缩机技术服务有限公司 | Intelligent opening-closing control method for air valve of piston compressor |
| CN108131285A (en) * | 2017-12-26 | 2018-06-08 | 衢州市质量技术监督检测中心 | A kind of system and method for testing screw compressor work indicator card |
| CN108361188A (en) * | 2018-02-27 | 2018-08-03 | 奥克斯空调股份有限公司 | Compressor test method and system |
| CN110440719A (en) * | 2019-08-07 | 2019-11-12 | 中国北方发动机研究所(天津) | A kind of engine gudgeon pin rotation wireless test apparatus and test method |
| CN111980903A (en) * | 2020-07-30 | 2020-11-24 | 珠海格力电器股份有限公司 | Detection assembly for measuring pressure in pump body, detection assembly of compressor and compressor |
| CN112576491A (en) * | 2020-11-13 | 2021-03-30 | 珠海格力电器股份有限公司 | Signal acquisition system, compressor and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20120428 |