CN203133105U - Low-frequency acceleration sensing transmitter - Google Patents
Low-frequency acceleration sensing transmitter Download PDFInfo
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- CN203133105U CN203133105U CN 201320024447 CN201320024447U CN203133105U CN 203133105 U CN203133105 U CN 203133105U CN 201320024447 CN201320024447 CN 201320024447 CN 201320024447 U CN201320024447 U CN 201320024447U CN 203133105 U CN203133105 U CN 203133105U
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- acceleration sensor
- current loop
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Abstract
The utility model discloses a low-frequency acceleration sensing transmitter, which is disposed on a monitored vibration instrument of a wind generating set, and is electrically connected with PLC to transmit signals. The low-frequency acceleration sensing transmitter includes an MEMS dual-axis acceleration sensor, two signal conditioning modules, two current loop transmission modules and two current output interfaces. Because the utility model adopts the MEMS dual-axis acceleration sensor to replace a conventional piezoelectric acceleration sensor as a vibration test member of the wind generating set and outputs PLC acceptable analog signals through the current loop transmission module, the structure can effectively reduce the corresponding devices, at the same time can effectively prevent electromagnetic interference resulted from outputting for PLC in an analog current form.
Description
Technical field
The present invention relates to a kind of sensing transducer, relate in particular to a kind of low frequency acceleration sensing transmitter.
Background technology
In the MW class wind turbine group, usually adopt conventional piezoelectric acceleration transducer as the vibration measuring device, piezoelectric accelerometer need cooperate charge amplifier, signal conditioner to work, and the signal of signal conditioner output is not, and simulating signal by common PLC institute energy compatibility is (as 0 ~ 10V or 4 ~ 20mA), so need do further conversion to signal, increase system cost.And piezoelectric acceleration sensor adopts concentric cable as signal transmission medium, and the anti-bending of concentric cable, anti-ly tie up, low temperature resistivity can be not good, limited its applied environment.Such sensor is voltage-type output in addition, signal attenuation can occur when cable is long, influences measuring accuracy, and is easy to be subjected to the interference of electromagnetic environment harsh in the blower fan and causes precise decreasing even damage.Simultaneously piezoelectric acceleration transducer is insensitive to superlow frequency vibrating (0.1Hz and following), has limited it in the application of blower fan structure vibration monitoring.Waterproof, the impact resistance of last piezoelectric accelerometer are general.
Summary of the invention
The objective of the invention is the defective at the existence of above-mentioned background technology, provide a kind of MEMS of employing double-axel acceleration sensor to replace conventional piezoelectric formula acceleration transducer also to export the low frequency acceleration sensing transmitter of PLC by the electric current loop transmitting module as the wind power generating set polarimetric element.
For achieving the above object, a kind of low frequency acceleration sensing of the present invention transmitter is installed in being subjected on the monitoring vibration apparatus of wind power generating set, and is electrically connected to transmit signal mutually with PLC.This low frequency acceleration sensing transmitter comprises a MEMS double-axel acceleration sensor, two signal condition modules, two electric current loop transmitting modules and two electric current output interfaces; The MEMS double-axel acceleration sensor is used for the acceleration of the X-direction of its mounting plane of monitoring and Y-direction and exports corresponding analog voltage signal; Two signal condition modules are used for the analog voltage signal that the MEMS double-axel acceleration sensor is sent into is carried out filtering, ratio conversion process and output; The electric current loop transmitting module can be finished analog voltage signal independently of one another to the conversion of the analog current signal that satisfies the PLC demand, and transmits analog current signal by an electric current output interface to PLC respectively.
In sum, a kind of low frequency acceleration sensing of the present invention transmitter, because adopting the MEMS double-axel acceleration sensor to replace conventional piezoelectric formula acceleration transducer as the wind power generating set polarimetric element and by the acceptable signal form of electric current loop transmitting module output PLC, this kind structure can be when effectively reducing corresponding device, because adopting the analog current form to export to PLC, so can effectively prevent electromagnetic interference (EMI).
Description of drawings
Fig. 1 is the synoptic diagram of a kind of low frequency acceleration sensing of the present invention transmitter.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, reached purpose and effect, below exemplify now that embodiment and conjunction with figs. are detailed gives explanation.
See also Fig. 1, a kind of low frequency acceleration sensing of the present invention transmitter, be installed in being subjected on the monitoring vibration apparatus of wind power generating set, and and PLC be electrically connected to transmit signal mutually, it comprises a MEMS double-axel acceleration sensor, two signal condition modules, two electric current loop transmitting modules, two electric current loop output interfaces.
Please continue and consult Fig. 1, wherein a signal condition module is arranged between the signal input part of a signal output part (X signal output part) of MEMS double-axel acceleration sensor and an electric current loop transmitting module wherein and realizes being electrically connected with the transmission signal with MEMS double-axel acceleration sensor and an electric current loop transmitting module respectively.
Between another signal output part (Y-terminal) that another signal condition module is arranged on the MEMS double-axel acceleration sensor and the signal input part of another electric current loop transmitting module and realize being electrically connected with the transmission signal with MEMS double-axel acceleration sensor and another electric current loop transmitting module respectively.
A kind of low frequency acceleration sensing transmitter for the MW class blower fan of the present invention further comprises three protection modules.
Wherein the input end of a protection module is electrically connected mutually with an electric current loop transmitting module output terminal wherein; The input end of another protection circuit module is electrically connected mutually with another electric current loop transmitting module module output terminal; The input end of the 3rd protection circuit module passes end with the power transfer module number and is electrically connected mutually.Because of the setting of protection circuit module, so the present invention can effectively resist the glitch that electromagnetic environment harsh in the blower fan is brought, can prevent that particularly surge from disturbing.
The MEMS double-axel acceleration sensor is used for the acceleration of the X-direction of its mounting plane of monitoring and Y-direction and exports corresponding analog voltage signal.The mounting plane X-direction of MEMS double-axel acceleration sensor is vertical mutually with Y-direction.
Because of the MEMS double-axel acceleration sensor very sensitive to the ultralow frequency acceleration, or even the characteristic of the constant acceleration of gravity that brings of inclination angle, can effectively satisfy on the basis of measuring conventional vibration the measurement demand that the ultralow frequency of the pylon that influences blower fan safety most, blade is shaken; Simultaneously, the MEMS double-axel acceleration sensor possesses very strong shock-resistant ability.
Particularly, the MEMS double-axel acceleration sensor can monitor the acceleration of the X-direction of its mounting plane and Y-direction and export the analog voltage signal of 0.5 ~ 4.5V, so improved the integrated level of system.It is 1V/g that described MEMS double-axel acceleration sensor adopts output acceleration and the scale factor of output analog voltage signal, and Hz-KHz is 0 ~ 5500Hz, and can bear the MEMS double-axel acceleration sensor up to the impact of 3000g.Described Hz-KHz is the frequency range that 0 ~ 5500Hz can cover each monitoring point of blower fan.
Two signal condition modules are used for the analog voltage signal that the MEMS double-axel acceleration sensor is sent into is carried out filtering, ratio conversion process and output.Concrete, the signal condition module is sent the MEMS double-axel acceleration sensor into 0.5 ~ 4.5V analog voltage signal and is converted 1 ~ 5V analog voltage signal to when carrying out the ratio conversion.
The electric current loop transmitting module can be finished analog voltage signal independently of one another to the conversion of the analog current signal that satisfies the PLC demand, and transmits analog current signal by an electric current output interface to PLC respectively.Concrete, the electric current loop transmitting module can independently be finished 1 ~ 5V analog voltage signal to the conversion of 4 ~ 20mA analog current signal.So the final signal output form of the present invention is 4 ~ 20mA analog current signal of accepting for common PLC, and form the situation of signal fading badly can avoid former Distance Transmission simultaneously the time.
Concrete, electric current loop transmitting module inside possesses mutual conductance and is set to 4mS electric current series connection negative-feedback circuit.Because electric current series connection negative-feedback circuit is known in the industry technology, repeat no more again.
The present invention further comprises a power transfer module, the electric power when this power transfer module is used for providing work to MEMS double-axel acceleration sensor, signal condition module and electric current loop transmitting module.
The signal transmitting method device of a kind of low frequency acceleration sensing of the present invention transmitter comprises the steps:
Step 1: utilize the collection of MEMS double-axel acceleration sensor to measure the acceleration signal on the both direction of mounting plane and export the corresponding simulating voltage signal;
Step 2: utilize the signal condition module that the analog voltage signal of exporting is carried out filtering, ratio conversion process;
Step 3: utilize the electric current loop transmitting module that the analog voltage signal that passes through the signal condition resume module is carried out the voltage-to-current conversion and exports corresponding current signal;
Step 4: give PLC by electric current output interface output current signal.
The scope of the analog voltage signal of MEMS double-axel acceleration sensor output is 0.5 ~ 4.5V in the described step 1.
The aanalogvoltage that the signal condition module is sent into the MEMS double-axel acceleration sensor in the described step 2 carries out corresponding ratio conversion by 0.5 ~ 4.5V to 1 ~ 5V.
To possess a mutual conductance be that the electric current series connection negative-feedback circuit of 4mS is 4 ~ 20mA with the scope of the analog current signal of guaranteeing the output of electric current loop transmitting module to the electric current loop transmitting module in the described step 3.
In sum, a kind of low frequency acceleration sensing of the present invention transmitter, because adopting the MEMS double-axel acceleration sensor to replace conventional piezoelectric formula acceleration transducer as the wind power generating set polarimetric element and by the acceptable signal form of electric current loop transmitting module output PLC, this kind structure can be when effectively reducing corresponding device, because adopting the analog current form to export to PLC, so can effectively prevent electromagnetic interference (EMI).
Above-described technical scheme only is the preferred embodiment of a kind of low frequency acceleration sensing of the present invention transmitter, and is any within the scope of the claim that the equivalent transformation of doing on a kind of low frequency acceleration sensing of the present invention transmitter basis or replacement are included in this patent.
Claims (7)
1. low frequency acceleration sensing transmitter, be installed in being subjected on the monitoring vibration apparatus of wind power generating set, and and PLC be electrically connected to transmit signal mutually, it is characterized in that: this low frequency acceleration sensing transmitter comprises a MEMS double-axel acceleration sensor, two signal condition modules, two electric current loop transmitting modules and two electric current output interfaces;
The MEMS double-axel acceleration sensor is used for the acceleration of the X-direction of its mounting plane of monitoring and Y-direction and exports corresponding analog voltage signal;
Two signal condition modules are used for the analog voltage signal that the MEMS double-axel acceleration sensor is sent into is carried out filtering, ratio conversion process and output;
The electric current loop transmitting module can be finished analog voltage signal independently of one another to the conversion of the analog current signal that satisfies the PLC demand, and transmits analog current signal by an electric current output interface to PLC respectively.
2. a kind of low frequency acceleration sensing transmitter according to claim 1, it is characterized in that: it is 1V/g that described MEMS double-axel acceleration sensor is selected output acceleration and the scale factor of output analog voltage signal for use, Hz-KHz is 0～5500Hz, and can bear the MEMS double-axel acceleration sensor up to the impact of 3000g.
3. a kind of low frequency acceleration sensing transmitter according to claim 2, it is characterized in that: the MEMS double-axel acceleration sensor can monitor X-direction and the acceleration of Y-direction and the analog voltage signal of corresponding output 0.5～4.5V of its mounting plane, and the X-direction of the mounting plane of MEMS double-axel acceleration sensor is vertical mutually with Y-direction.
4. a kind of low frequency acceleration sensing transmitter according to claim 1, it is characterized in that: electric current loop transmitting module inside possesses mutual conductance and is set to 4mS electric current series connection negative-feedback circuit, and the analog voltage signal that can finish 1V～5V that the signal condition module is exported is converted to 4～20mA analog current signal.
5. a kind of low frequency acceleration sensing transmitter according to claim 1 is characterized in that: wherein a signal condition is arranged between the signal input part of a signal output part of MEMS double-axel acceleration sensor and an electric current loop transmitting module wherein and realizes being electrically connected with the transmission signal with MEMS double-axel acceleration sensor and an electric current loop transmitting module respectively; Between another signal output part that another signal condition module is arranged on the MEMS double-axel acceleration sensor and the signal input part of another electric current loop transmitting module and realize being electrically connected with the transmission signal with MEMS double-axel acceleration sensor and another electric current loop transmitting module respectively.
6. a kind of low frequency acceleration sensing transmitter according to claim 1, it is characterized in that: low frequency acceleration sensing transmitter further comprises three protection circuit modules; Wherein the input end of a protection circuit module is electrically connected mutually with an electric current loop transmitting module output terminal wherein; The input end of another protection circuit module is electrically connected mutually with another electric current loop transmitting module output terminal; The input end of the 3rd protection circuit module is electrically connected mutually with the power transfer module output terminal.
7. a kind of low frequency acceleration sensing transmitter according to claim 1, it is characterized in that: low frequency acceleration sensing transmitter further comprises a power transfer module, the electric power when this power transfer module is used for providing work to MEMS double-axel acceleration sensor, signal condition module and electric current loop transmitting module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320024447 CN203133105U (en) | 2013-01-17 | 2013-01-17 | Low-frequency acceleration sensing transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320024447 CN203133105U (en) | 2013-01-17 | 2013-01-17 | Low-frequency acceleration sensing transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN203133105U true CN203133105U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320024447 Expired - Fee Related CN203133105U (en) | 2013-01-17 | 2013-01-17 | Low-frequency acceleration sensing transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454448A (en) * | 2013-01-17 | 2013-12-18 | 成都阜特科技股份有限公司 | Low-frequency acceleration sensor transmitter |
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2013
- 2013-01-17 CN CN 201320024447 patent/CN203133105U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454448A (en) * | 2013-01-17 | 2013-12-18 | 成都阜特科技股份有限公司 | Low-frequency acceleration sensor transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20220117 |