CN202768360U - Vibrating controller of machine shell - Google Patents
Vibrating controller of machine shell Download PDFInfo
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- CN202768360U CN202768360U CN201220451008.6U CN201220451008U CN202768360U CN 202768360 U CN202768360 U CN 202768360U CN 201220451008 U CN201220451008 U CN 201220451008U CN 202768360 U CN202768360 U CN 202768360U
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- vibrating controller
- piezocrystal
- transducer
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Abstract
The utility model relates to a vibrating controller of a machine shell, in particular to an electromechanical integral piezoelectric vibrating controller. An input end of a piezocrystal is connected with the machine shell, an output end of the piezocrystal is connected with an input end of a charge integrator, an output end of the charge integrator is connected with an input end of an amplification filter, and an output end of the amplification filter is connected with an input end of a speed acceleration integrator. An output end of the speed acceleration integrator is connected with an input end of a root mean square (RMS)-direct current (DC) converter, and an output end of the RMS-DC converter is connected with a V/I converter. Positive piezoelectric effect of a passive piezocrystal is utilized to transform outputted charge of the piezocrystal to current signals which are in direct proportion to the vibration quantity, and the vibrating controller can be directly matched with a meter to display numerical reading and recording and can be directly matched with a data acquisition machine to carry out collecting and analyzing. Due to the fact that the piezocrystal is adopted by a sensitive element in a sensor, the vibrating controller of the machine shell can be widely applied to vibrating impact measurement of fields, such as a fan, a water pump, a motor and a compressor.
Description
Technical field
The utility model relates to reciprocal compressor casing vibrating controller, specifically a kind of casing vibrating controller.
Background technique
Reciprocal compressor is the rotating machinery that utilizes crankshaft driving piston that gas pressure is improved.During compressor operating, casing can produce certain vibratory output.For guaranteeing that reciprocal compressor runs well, the prevention stone bolt is loosening and piston rod is loosening, must monitor the casing vibration of reciprocal compressor, so need to detect the casing vibration.What traditional casing vibration detection adopted is the mechanical type vibroswitch.The mechanical type vibroswitch is non-continuous, and error is large, misoperation often occurs and the phenomenon of being failure to actuate, and very easily causes the compressor operating accident.
The model utility content
For above-mentioned deficiency of the prior art, the technical problems to be solved in the utility model provides and measures accurately, the little a kind of casing vibrating controller of error.
The technological scheme that the utility model adopts for achieving the above object is: a kind of casing vibrating controller, comprise piezoelectric crystal, described piezoelectric crystal input end is used for connecting casing, output terminal connects the input end of charge integrator, the output terminal of charge integrator is connected to the input end of amplifilter, the amplifilter output terminal connects the input end of integrated acceleration device, the output terminal of integrated acceleration device connects the input end of RMS-DC transducer, and the output terminal of RMS-DC transducer connects the V/I transducer.
Described charge integrator is the integrator that the form of electrical charges acceleration signal of piezoelectric crystal output is integrated into the voltage form acceleration signal.
Described amplifilter for the voltage form acceleration signal is amplified, the amplifilter of dynamic signal output after the filtering.
Described Dynamic Signal is the acceleration signal take 100mV/g as standard with casing vibration dynamic change.
Described RMS-DC transducer is for being converted to alternating voltage form rate signal and vibrate the transducer of the VDC form rate signal that is directly proportional.
Described V/I transducer is for to be converted to the 4-20mA dc current signal with VDC form rate signal.
The utlity model has following advantage:
1. applied range can be widely used in the vibratory impulse measurement in the fields such as blower fan, water pump, motor, compressor;
2. vibration measurement is accurate, and error is less, uses safety, structural stability, is difficult for causing the compressor operating accident.
Description of drawings
Fig. 1 is general frame figure of the present utility model;
Fig. 2 is the total frame diagram of implementation of the present utility model.
Wherein: 1 is the casing vibrating controller, and 2 is guard grating, and 3 is secondary meter.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Be illustrated in figure 1 as general frame figure of the present utility model, utilize the characteristic of piezoelectric crystal, experience the vibration of object, the electric charge that piezoelectric crystal is produced amplifies and becomes voltage signal.Voltage signal carries out the acceleration signal that amplification filtering obtains 100mV/g again, is the rate signal of the mm/s of effective value through integrating conversion again, finally by the 4-20mA current signal of V-I conversion outputting standard.This current signal is directly connected to PLC, DCS or other can accept the supervisory instrument of 4-20mA current signal.
The piezoelectric crystal part: crystal is when being subject to External Force Acting, and its two ends will produce different electric charges.Or adding voltage at the two ends of crystal, crystal can produce distortion.This effect is called as piezoelectric effect.The crystal that can produce piezoelectric effect just is piezoelectric crystal.When piezoelectric crystal was subject to vibrating, two surfaces produced electric charges, i.e. piezoelectric effect, and mechanical quantity is converted into electric weight.
Input signal is oscillating signal, and output signal is the electric charge of piezoelectric crystal, charge sensitivity, approximately tens pC/g.
Charge integrator: be the vibration charge integration voltage signal output.Input signal is tens coulombs electric quantity signal, and output signal is that charge integration becomes voltage signal, and formula is V=Q/Cf, and wherein Cf is integrating capacitor, and calculating output voltage probably is tens mV
Amplifilter: the acceleration voltage signal to integration carries out amplification filtering.The signal of inputting tens mV is carried out filtering.Dynamic Signal output: dynamic signal output 100mV/g after the amplification filtering, input signal are the voltage of tens mV, and suitable the accent amplified the Dynamic Signal that is output as 100mV/g.
The integrated acceleration device: function is for to be integrated into rate signal to acceleration signal.Input 100mV acceleration signal is integrated into rate signal, approximately about tens mV.
The RMS-DC transducer: function is carried out effective value-direct current conversion, the d. c. voltage signal that output and vibration are directly proportional for the rate signal that exchanges.
Input voltage is the alternating signal that is 300mV to the maximum, and output dc voltage is 200mV to the maximum.
The V/I transducer: function is for to carry out the V/I conversion to rate signal, the 4-20mA signal that output and vibration are directly proportional.
Input voltage through the V/I conversion, is exported corresponding 4-20mA signal for vibration direct current signal 0.4-2V direct current signal.
Be illustrated in figure 2 as the total frame diagram of implementation of the present utility model, vibrating controller 1 is delivered to the control room as on-the-spot input signal, through guard grating 2 isolation, at secondary meter 3 this vibration values is shown; Guard grating 2 claims again safety limit energy device, is the important component part in this case system, and its core parts are Zener diode Z, current-limiting resistance R and rapid fuse F.The major function of guard grating 2 is current limiting pressure-limiting, guarantees that the available energy of field instrument secondary meter 3 in safety range is Displaying Meter PLC or DCS.
Casing vibrating controller work theory basis:
The vibration acceleration controller adopts piezoelectric crystal, and crystal material is when bearing the external force deformation of certain orientation, and its electrode surface can produce and the corresponding electric charge of external force.
Then have: Q=dF
Wherein Q is the quantity of electric charge, and d is the piezoelectric crystal of piezoelectric crystal, and F is active force
We generally add an inertial mass at crystal, then according to Newton's second law
F=ma
Wherein m is quality, and a is acceleration.
Bring this formula into following formula, can obtain the quantity of electric charge that is directly proportional with acceleration at the two ends of crystal, this has just realized the measurement of acceleration.
Casing vibrating controller relevant parameter is as follows:
Oscillating region: 4-20mA signal output proportional to vibration acceleration;
Precision: 2% (repeatability);
Dynamic Signal: acceleration 100mv/g;
Frequency response: 2-2000HZ;
Induction direction: arbitrarily;
Power supply: 12-30VDC, nonpolarity terminal;
Electrical connection: optional arbitrarily;
Shell material: 304SS;
Environmental Conditions: temperature-40 ℃～100 ℃;
Relative moisture≤90%;
Housing security level: NEMA 4X, IP65, IP67, two nail joint heads.
Claims (6)
1. casing vibrating controller, comprise piezoelectric crystal, it is characterized in that, described piezoelectric crystal input end is used for connecting casing, output terminal connects the input end of charge integrator, and the output terminal of charge integrator is connected to the input end of amplifilter, and the amplifilter output terminal connects the input end of integrated acceleration device, the output terminal of integrated acceleration device connects the input end of RMS-DC transducer, and the output terminal of RMS-DC transducer connects the V/I transducer.
2. casing vibrating controller according to claim 1 is characterized in that, described charge integrator is the integrator that the form of electrical charges acceleration signal of piezoelectric crystal output is integrated into the voltage form acceleration signal.
3. casing vibrating controller according to claim 1 is characterized in that, described amplifilter for the voltage form acceleration signal is amplified, the amplifilter of dynamic signal output after the filtering.
4. casing vibrating controller according to claim 3 is characterized in that, described Dynamic Signal is the acceleration signal take 100mV/g as standard with casing vibration dynamic change.
5. casing vibrating controller according to claim 1 is characterized in that, described RMS-DC transducer is for being converted to alternating voltage form rate signal and vibrate the transducer of the VDC form rate signal that is directly proportional.
6. casing vibrating controller according to claim 1 is characterized in that, described V/I transducer is for to be converted to the 4-20mA dc current signal with VDC form rate signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220451008.6U CN202768360U (en) | 2012-09-05 | 2012-09-05 | Vibrating controller of machine shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220451008.6U CN202768360U (en) | 2012-09-05 | 2012-09-05 | Vibrating controller of machine shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202768360U true CN202768360U (en) | 2013-03-06 |
Family
ID=47774941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220451008.6U Expired - Lifetime CN202768360U (en) | 2012-09-05 | 2012-09-05 | Vibrating controller of machine shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202768360U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109178600A (en) * | 2018-10-31 | 2019-01-11 | 郑州云启工业设备技术有限公司 | A kind of electromagnetic absorption device for packing case |
| CN112855488A (en) * | 2019-11-12 | 2021-05-28 | 宁波方太厨具有限公司 | Booster pump |
-
2012
- 2012-09-05 CN CN201220451008.6U patent/CN202768360U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109178600A (en) * | 2018-10-31 | 2019-01-11 | 郑州云启工业设备技术有限公司 | A kind of electromagnetic absorption device for packing case |
| CN112855488A (en) * | 2019-11-12 | 2021-05-28 | 宁波方太厨具有限公司 | Booster pump |
| CN112855488B (en) * | 2019-11-12 | 2022-04-19 | 宁波方太厨具有限公司 | Booster pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHENYANG BLOWER WORKS GROUP AUTOMATIC CONTROL SYSTEM ENGINEERING Co.,Ltd. Assignor: SHENYANG TURBO MACHINERY Co.,Ltd. Contract record no.: 2015210000036 Denomination of utility model: Vibrating controller of machine shell Granted publication date: 20130306 License type: Exclusive License Record date: 20150615 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130306 |