CN212645882U - Monitoring system of evaporator heat exchange tube - Google Patents
Monitoring system of evaporator heat exchange tube Download PDFInfo
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- CN212645882U CN212645882U CN202021552114.4U CN202021552114U CN212645882U CN 212645882 U CN212645882 U CN 212645882U CN 202021552114 U CN202021552114 U CN 202021552114U CN 212645882 U CN212645882 U CN 212645882U
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Abstract
The embodiment of the specification discloses a monitoring system of an evaporator heat exchange tube, which comprises a vibration sensor, a data collector and a data analysis platform, wherein the vibration sensor is arranged on the heat exchange tube of an evaporator to detect and obtain a vibration signal of the heat exchange tube; the data acquisition unit is connected with the vibration sensor and is used for acquiring the vibration signal output by the vibration sensor so as to obtain vibration data of the heat exchange tube; and the data analysis platform is connected with the data acquisition unit and is used for analyzing the vibration data output by the data acquisition unit so as to output a corresponding analysis result. The embodiment of the specification can monitor the vibration magnitude of the heat exchange tube and prevent the heat exchange tube from cracking due to vibration.
Description
Technical Field
The specification relates to the field of seawater evaporation and desalination, in particular to a monitoring system for an evaporator heat exchange tube.
Background
Low Temperature Multiple Effect Distillation (LT-MED) is one of the mainstream seawater desalination technologies in the world, and the Low Temperature Multiple Effect Distillation technology utilizes the principle that a plurality of evaporators connected in series repeatedly evaporate for many times, thereby obtaining fresh water which is many times of heating steam. The low-temperature multi-effect distillation technology has the advantages of high quality of desalted water, low requirement on pretreatment, wide application range of seawater temperature and the like through technical and economic comparison. In order to reduce the construction cost of low-temperature multi-effect seawater desalination projects and adapt to the application requirements of large-scale seawater desalination plants, suppliers of various main low-temperature multi-effect seawater desalination technologies in the world compete with one another to develop large-capacity low-temperature multi-effect seawater desalination devices.
However, practical engineering experience shows that the evaporator heat exchange tube of the sea water desalination device based on the MED technology is cracked due to flow-induced vibration of the heat exchange tube during operation, and the cracked heat exchange tube can cause seawater to enter fresh water, so that the quality of the produced fresh water is poor or even does not meet relevant standard requirements, and the fresh water production rate of the evaporator is reduced.
Therefore, in the operation process of the seawater desalination apparatus, a technical means that can closely monitor the vibration condition of the heat exchange tube and ensure that the heat exchange tube is not broken due to the vibration is needed.
SUMMERY OF THE UTILITY MODEL
The embodiment of the specification provides a monitoring system for an evaporator heat exchange tube, and aims to solve the problem that the existing evaporator heat exchange tube is broken due to vibration.
In order to solve the above technical problem, the present specification is implemented as follows:
in a first aspect, an embodiment of the present specification provides a monitoring system for an evaporator heat exchange tube, including a vibration sensor, a data collector and a data analysis platform, where the vibration sensor is installed on the heat exchange tube of an evaporator to detect and obtain a vibration signal of the heat exchange tube; the data acquisition unit is connected with the vibration sensor and is used for acquiring the vibration signal output by the vibration sensor so as to obtain vibration data of the heat exchange tube; and the data analysis platform is connected with the data acquisition unit and analyzes the vibration data output by the data acquisition unit to output a corresponding analysis result.
Optionally, the vibration sensor is a piezoelectric acceleration sensor, so as to convert an acceleration signal of the heat exchange tube during vibration into the vibration signal of a voltage signal; alternatively, the first and second electrodes may be,
the vibration sensor is a current type acceleration sensor, so that an acceleration signal generated when the heat exchange tube vibrates is converted into a vibration signal of a current signal.
Optionally, when the vibration sensor is a piezoelectric acceleration sensor, the system further includes:
and the constant current source adapter is connected between the vibration sensor and the data acquisition unit, amplifies and filters the voltage signal output by the vibration sensor, converts the voltage signal into a current signal, and transmits the current signal to the data acquisition unit in a long distance.
Optionally, the number of the vibration sensors is multiple, and the vibration sensors are respectively and correspondingly installed on multiple vibration measuring points of each heat exchange tube.
Optionally, the plurality of vibration measuring points are arranged at least at the fluid inlet end of the heat exchange tube, the fluid outlet end of the heat exchange tube, and an intermediate position between the fluid inlet end and the fluid outlet end.
Optionally, the vibration sensor is a cylinder, and the axial direction of the cylinder is perpendicular to the axial direction of the heat exchange tube.
Optionally, a signal cable is connected between the data collector and the vibration sensor, and the signal cable corresponds to the vibration sensor one to one.
Optionally, the signal cable is horizontal to the axial direction of the heat exchange tube from the outlet direction of the vibration sensor.
Optionally, the signal cable is externally coated with an insulating layer and a waterproof layer, and the insulating layer and the waterproof layer are integrally packaged with the shell of the vibration sensor.
Optionally, the system further comprises: the mounting support is mounted on a vibration measuring point of the heat exchange tube, and the vibration sensor is mounted on a supporting surface of the mounting support.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects: the vibration sensor is arranged on the heat exchange tube of the seawater desalination steam generator to monitor the vibration of the heat exchange tube, so that the vibration data of the heat exchange tube can be timely and accurately acquired, and the possible damage phenomenon of the heat exchange tube can be early warned according to the analysis result of the vibration data, so that the safe operation of the seawater desalination steam generator is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description serve to explain the specification and not to limit the specification in a non-limiting sense. In the drawings:
fig. 1 is a schematic structural diagram of a monitoring system of an evaporator heat exchange tube according to a first embodiment of the present disclosure.
Fig. 2 is a schematic view of a vibration sensor installation design of an evaporator heat exchange tube according to an embodiment of the present disclosure.
Fig. 3 is a schematic connection diagram of a monitoring system for heat exchange tubes of an evaporator according to an embodiment of the present disclosure.
Fig. 4 is a schematic data transmission diagram of a monitoring system of an evaporator heat exchange tube according to an embodiment of the present disclosure.
Fig. 5 is a software functional schematic diagram of a monitoring system of an evaporator heat exchange tube according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions of the present disclosure will be clearly and completely described below with reference to the specific embodiments of the present disclosure and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort belong to the protection scope of the present specification.
The technical solutions provided by the embodiments of the present description are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a monitoring system for an evaporator heat exchange tube according to a first embodiment of the present disclosure, and as shown in the figure, the monitoring system 1000 for an evaporator heat exchange tube includes a vibration sensor 1100, a data collector 1300, and a data analysis platform 1500.
The vibration sensor 1100 is installed on the heat exchange pipe of the evaporator to detect a vibration signal of the heat exchange pipe. In one embodiment, the mounting structure of the vibration sensor can refer to fig. 2, and fig. 2 is a schematic view of the mounting design of the vibration sensor of the heat exchange tube of the evaporator according to the embodiment of the present disclosure.
Considering that the arrangement interval of the heat exchange tubes in the evaporator is small, the rigidity of the heat exchange tubes is poor, and a special sensor mounting support is designed during measurement. As shown in FIG. 2, a mounting bracket 30 is mounted on the vibration station of the heat exchange pipe 20, and a vibration sensor (not shown in FIG. 2) is mounted on a support surface 34 of the mounting bracket 30. The mounting support 30 may be fabricated from titanium alloy, and has the characteristics of light weight and good rigidity, thereby reducing the attenuation of the vibration transmission process. As shown in fig. 2, one end of the mounting support 30 may be a semi-circular arc shape, which is matched with the outer diameter of the heat exchange tube 20, and during measurement, the mounting support 30 is attached to the surface of the heat exchange tube 20 to be measured by using a strong metal adhesive, and the mounting support 30 is well connected with the heat exchange tube 20. The support surface 34 of the mounting bracket 30 is horizontal and makes good contact with the vibration sensor. The vibration sensor can be fixed on the tested heat exchange pipe by screwing the vibration sensor into the screw hole 32 of the support surface 34.
The mounting support 30 is designed to be lightweight, have a good connection with the vibrating heat exchange tubes, and be light in weight and rigid, without affecting the accuracy of the vibration measurement.
In one embodiment, the vibration sensor is a cylinder, and the axial direction of the cylinder is perpendicular to the axial direction of the heat exchange tube. As described above, the heat exchange tubes are arranged at a small interval in the evaporator, and in order to avoid collision of the vibration sensor with the heat exchange tubes, the vibration sensor may be slightly deviated from the obverse surface of the installed heat exchange tubes, rather than being disposed on the obverse surface.
In addition, in the low-temperature multi-effect seawater desalination evaporator, the seawater is heated to 70 ℃ at most, and the seawater is concentrated after being evaporated to have strong corrosivity, so that the shell of the vibration sensor can be made of the same titanium alloy material as the heat exchange tube, and the service life of the vibration sensor is prolonged. The sensor adopts the titanium alloy shell, can effectively prevent the concentrated seawater corrosion, guarantees that monitoring system lasts the operation for a long time.
The data collector 1300 is connected with the vibration sensor 1100, and collects vibration signals output by the vibration sensor 1100 to obtain vibration data of the heat exchange tube. Specifically, the data collector 1300 further collects and converts the voltage signal or the current signal output by the vibration sensor 1100 into a vibration acceleration signal according to a predetermined sampling frequency.
The data analysis platform 1500 is connected to the data collector 1300, and analyzes the vibration data output by the data collector 1300 to output a corresponding analysis result.
In one embodiment, the vibration sensor is a piezoelectric acceleration sensor to convert an acceleration signal when the heat exchange tube vibrates into a vibration signal of a voltage signal; or, the vibration sensor is a current type acceleration sensor to convert an acceleration signal when the heat exchange tube vibrates into a vibration signal of a current signal.
Because the seawater desalination steam generator is arranged in seawater, a vibration signal of the heat exchange tube of the evaporator, which is detected by the vibration sensor, needs to be transmitted to a data acquisition unit at a far end through long-distance transmission. When vibration sensor is piezoelectric type acceleration sensor, the acceleration signal conversion when the heat exchange tube vibration that can detect becomes voltage signal, however voltage signal can produce resistance when long distance transmission, leads to appearing the voltage signal deviation, so can cause the vibration data of data collection station collection to have the deviation.
Therefore, in an embodiment, when the vibration sensor is a piezoelectric acceleration sensor, the monitoring system 1000 for the evaporator heat exchange tube may further include a constant current source regulator (not shown in the figure), which is connected between the vibration sensor 1100 and the data collector 1300, and amplifies and filters the voltage signal output by the vibration sensor 1100, and converts the voltage signal into a current signal, so as to transmit the current signal to the data collector 1300 at a long distance.
In addition, when the vibration sensor is a current type acceleration sensor, the detected acceleration signal when the heat exchange tube vibrates can be converted into a current signal, and the current signal does not cause current signal deviation when being transmitted for a long distance. In this case, the constant current source regulator may not be used. However, when the heat exchange tube is a titanium alloy tube with light weight, a current type sensor with light weight needs to be adopted, and the influence of the mass of the vibration sensor on the measurement precision is reduced to the maximum extent.
As described above, the voltage signal has an error during long distance transmission, but if the voltage signal is transmitted within a distance of ten and several meters, the error is within an allowable range, that is, in the case of short distance signal transmission, the constant current source adapter may not be used. If the error is increased by more than ten meters, a constant current adapter is needed to convert the voltage signal into a current signal which can be transmitted in a long distance.
In order to accurately measure the vibration condition of the heat exchange pipe, in one embodiment, the number of the vibration sensors can be multiple, and the vibration sensors are respectively correspondingly arranged on multiple vibration measuring points of each heat exchange pipe. A plurality of vibration stations are disposed at least at the fluid inlet end, the fluid outlet end, and an intermediate location between the fluid inlet end and the fluid outlet end of the heat exchange tube. Namely, the vibration conditions at the two ends and the middle position of the tube body of the heat exchange tube are monitored.
Further, the evaporator generally has thousands of heat exchange tubes, but may not be provided with a measuring point and mounted with a vibration sensor on all the heat exchange tubes. The heat exchange tube provided with the vibration sensor is selected and determined according to the special flow effect of fluid outside the tube, and a vibration measuring point can be arranged on the heat exchange tube which has high vibration caused by high flow-induced vibration and has a large steam flow field for steam generated by the evaporator to flow out. Vibration measuring points are also required for heat exchange tubes, for example, where the flow induced vibration frequency and the natural frequency of the heat exchange tube can resonate. In addition, for the heat exchange tube directly flushed by the seawater nozzle, the heat exchange tube vibrates violently due to seawater impact, and a vibration measuring point can be arranged.
And signal cables are connected between the data acquisition device 1300 and the vibration sensors 1100, and the signal cables correspond to the vibration sensors one by one. Namely, the vibration signal detected by each vibration sensor is transmitted to the data acquisition unit through the corresponding signal cable transmission channel.
For piezoelectric vibration sensors, a constant current source adapter is added in long-distance transmission. At this time, the signal cables are also connected to the corresponding interfaces of the constant current source adapters in a one-to-one correspondence. And the vibration sensor 1100 transmits the detected vibration voltage signal to the constant current source adjuster through the corresponding signal cable, and then the constant current source adjuster transmits the vibration voltage signal to the data collector 1300 through the signal cable.
The signal cable is an electronic element, in order to avoid seawater corrosion, the outer part of the signal cable connected with one end of the vibration sensor is coated with an insulating layer and a waterproof layer, and the insulating layer and the waterproof layer of the signal cable and the shell of the vibration sensor are integrally packaged. The vibration sensor is also an electronic component, and similarly to avoid seawater corrosion, a package is required to enclose the electronic component inside the vibration sensor. The outer insulating layer and the waterproof layer of the signal cable are integrated with the shell of the vibration sensor, so that external seawater can be isolated. In addition, the vibration sensor and the signal cable are packaged in an integrated mode, so that the water tightness of the vibration sensor under the negative pressure condition can be guaranteed, and short circuit of instruments and equipment is prevented.
The signal cable is connected with the vibration sensor, and under the condition that the axis direction of the vibration sensor is perpendicular to the axis direction of the heat exchange tubes, the signal cable can collide with the adjacent heat exchange tubes which are arranged tightly if the signal cable is vertically arranged, and the signal cable is hung on the heat exchange tubes if the signal cable is caused. Vibration of the cable leads to inaccurate vibration signals of the vibration sensor. Therefore, in one embodiment, the outgoing direction of the signal cable from the vibration sensor is horizontal to the axial direction of the heat exchange pipe.
Next, referring to fig. 3, fig. 3 is a description of the connection relationship of the monitoring system for the heat exchange tube of the evaporator according to the embodiment of the present disclosure. In this embodiment, the vibration sensor 1100 is exemplified by a piezoelectric acceleration sensor.
The vibration sensor 2100 is provided on the surface of the heat exchange tube 20, the vibration sensor 2100 has a cylindrical shape, an axis of the vibration sensor 2100 is perpendicular to an axis of the vibration sensor 2100, and is disposed upward along the surface of the vibration sensor 2100, and a plurality of signal cables 2400 are connected to each of the vibration sensors 2100 in a one-to-one correspondence, and are horizontally drawn out from one end of the vibration sensor 2100 and the arrangement direction of the heat exchange tube 20. The signal cables 2400 are connected to respective interfaces of the constant current source regulator 2200, and the vibration signals are transmitted to the data collector 2300 by a plurality of signal cables 2600 between the constant current source regulator 2200 and the data collector 2300. The data acquisition unit 2300 converts the vibration signal in the form of current or voltage into an acceleration vibration signal, and outputs the acceleration vibration signal to a data analysis platform, which is a computer 2500 in this embodiment.
Referring now to fig. 4, fig. 4 is a schematic data transmission diagram of a monitoring system for an evaporator heat exchange tube according to an embodiment of the present disclosure.
As shown in the figure, the plurality of vibration measuring points 1, 2, 3, … m corresponding to the heat exchange tubes of the evaporator correspond to the plurality of acceleration sensors 2100, and the acceleration sensors 2100 convert the detected acceleration signals into voltage signals and transmit the voltage signals to the constant current source regulator 2200. The constant current source adapter 2200 transmits the voltage signal to the data collector 2300 through a plurality of signal cables 2600, and transmits the voltage signal to the computer 2500 for analysis and outputs a corresponding analysis result after the voltage signal is converted into an acceleration signal by the data collector.
In one embodiment, when a piezoelectric acceleration sensor is used, the configuration of the vibration sensor may be as follows:
the number of the components: the number of vibration measuring points of the heat exchange tubes of the evaporator is determined, but is generally not less than 18.
② main technical parameters
a. Type (2): a micro IEPE uniaxial piezoelectric accelerometer;
b measurement range: plus or minus 50 g;
c. the installation mode is as follows: m3 bolt connection;
d. response frequency: 1-10,000 Hz;
e. resolution ratio: 0.002g (i.e., 0.0002m/s2) and higher;
f. axial sensitivity: 10 mV/g;
g. impact resistance: 1500g
h. Resonance frequency: not less than 30kHz
i. Working temperature: the working temperature range is-40 to +121 ℃;
third basic requirement
a. The additional mass of the vibration sensor has great influence on the natural frequency of the heat exchange pipe, and the weight of a single vibration sensor is less than 10 g;
b. the size of the vibration sensor has great influence on the flow of nearby steam, and additional exciting force can be generated; the space between the heat exchange pipes is small, so that the field installation is considered, and the external dimension of the vibration sensor is less than phi 10 multiplied by H9.5mm;
c. the vibration sensor has good temperature resistance and high waterproof and seawater corrosion resistance;
d. calibrating a vibration sensor: a supplier must issue a calibration certificate of an authority;
e. the measuring direction of the sensor is vertical relative to the heat exchange tube, and the outgoing direction of the signal wire is horizontal relative to the heat exchange tube.
In one embodiment, the configuration of the signal cable may be, for example, as follows:
the number of the components: the number of the signal cables is consistent with the number of the mounting measuring points of the sensor.
Technical requirements 2
a. The length requirement is as follows: the length of the transmission line of the signal cable of each sensor is determined according to field measurement, and the length of the signal cable of each channel is about 40-50 meters.
b. The performance requirements are as follows: the signal cable has good high temperature resistance, seawater corrosion resistance and waterproof performance, and good electromagnetic interference resistance, and in addition, in order to meet the requirements of water resistance and corrosion resistance, the vibration sensor and the signal cable are packaged in an integrated mode.
In one embodiment, the configuration of the constant current source adapter may be, for example, as follows:
main technical parameters
ICP constant current output is 4mA or 10mA adjustable;
b. the constant-current working voltage is +24VDC, and the gain is 10;
c. the frequency range is 0.3 Hz-100 kHz, and the precision is less than +/-1%.
Basic requirements-
a. Has certain rain-proof function;
b. has certain functions of corrosion prevention and dust prevention.
In one embodiment, the configuration of the data collector may be, for example, as follows:
main technical parameters
a. Sampling rate: up to 102.4 kHz/CH;
b. precision: better than 0.3%;
c. frequency indication and frequency resolution error: better than 0.01%;
d. input interface channel: IEPE type, matched to the output of a constant current source adapter.
Basic requirements-
a. Overvoltage protection is provided;
b. additional program control anti-aliasing filtering;
c. the type is a chassis type, and is not a card type.
In one embodiment, the configuration of the data analysis platform may be, for example, as follows:
main technical parameters
a, CPU: kurui four-core i 7-7700;
b. memory: 8G;
c. hard disk: 2, one for system disk, 1 TB; the other is used for a data disc, is larger than 2TB, and the rotating speeds are 7200 RPM;
d. operating the system: win 10;
e. a display: 23 inches and above;
f. sleeving a keyboard mouse;
g. except for linking a mouse and a keyboard, the number of the USB ports is not less than 2.
The basic requirements are as follows:
a. can be matched with the performance of the data acquisition unit;
b. dust-proof, moisture-proof and antistatic;
c. the hard disk can store more than 6 months of vibration data;
d. powering on and automatically restarting;
e. the communication mode of the computer and the collector is USB communication.
It should be noted that the configuration requirements of each device described above are only used for clearly illustrating the protection scope of the present application, and the configuration requirements of each device are not limited to the specific embodiment described above in the present specification.
In addition to the hardware configuration, the software function of the monitoring system will be described below with reference to fig. 5, and fig. 5 is a software function schematic diagram of the monitoring system of the heat exchange tube of the evaporator according to the embodiment of the present disclosure.
The software of the heat exchange pipe vibration monitoring system must satisfy the basic functions shown in fig. 5, but is not limited to those shown in fig. 5, according to the overall requirements of the project.
The basic functions of each software are respectively explained as follows:
managing a system: the functional module mainly sets a channel and a collection corresponding to the vibration sensor, the signal cable and a corresponding data collector interface, and mainly comprises the sampling rate and the sensitivity of the data collector, the setting of a sensor mark, the setting of a signal collection triggering mode, the setting of a data storage mode, the calibration of system time, the setting of sampling time length and intervals of a continuous monitoring process, the setting of alarm and the like. The system has a self-fault diagnosis function and has strong fault self-healing capability.
Collecting data: the functional module is mainly executed on a data acquisition unit, acquires signals through the data acquisition unit, transmits the acquired and converted acceleration signals to a computer of a data analysis platform, and performs background data processing and analysis; and simultaneously recording the operating state parameters of the evaporator at the corresponding moment of the acquired signal, such as spraying water flow, spraying water temperature, evaporator evaporation capacity, evaporator steam side pressure and environment temperature, and using the parameters for background data analysis of a subsequent data analysis platform.
Analysis of data: the functional module is mainly executed on a data analysis platform.
a. And displaying the time domain waveform of the current vibration data, and displaying the number of the selected data in the data display window.
b. In the uninterrupted data acquisition process, the frequency spectrum analysis of the current vibration data, the digital display of the selected data in the data display window and the comparison analysis of the time domain waveform and the frequency spectrum of the same channel are carried out.
c. And in the uninterrupted data acquisition process, displaying the time domain waveform of the historical vibration data, and displaying the number of the selected data in the data display window.
d. In the uninterrupted data acquisition process, the frequency spectrum analysis of the historical vibration data, the digital display of the selected data in the data display window and the comparison analysis of the time domain waveform and the frequency spectrum of the same channel are carried out.
e. And respectively carrying out primary integration and secondary integration on the vibration acceleration signal to respectively obtain a vibration speed signal and a vibration displacement signal, and carrying out spectrum analysis on the vibration speed signal and the vibration displacement signal.
f. All data are stored by adopting a database, so that data management is facilitated.
g. The output of the analysis graph is convenient, and the method is compatible with the general word processing software.
Safety assessment: the function module can be executed on a display screen corresponding to the data analysis platform.
Through this functional module, can realize:
a. the current vibrating subchannel alert displays, for example, in three colors: green, yellow, red, different colors represent different degrees of alarm warning.
b. Displaying historical trend analysis of vibration amplitude (including acceleration amplitude, speed amplitude and displacement amplitude) of any selected channel; displaying the historical trend analysis of vibration amplitude (including acceleration amplitude, velocity amplitude and displacement amplitude) of multiple channels.
c. And (4) historical statistical analysis of vibration alarm.
d. Simple automatic generation of analysis reports.
In one embodiment, the vibration data includes at least one of vibration acceleration, vibration velocity, and vibration displacement. And the data analysis platform analyzes the vibration signal correspondingly detected by the vibration sensor, and sends alarm prompt information when determining that the vibration displacement is greater than a preset threshold value. The predetermined threshold value may be, for example, 0.02d, where d represents the diameter of the heat exchange tube. When the vibration displacement is smaller than 0.02d, the data analysis platform sends out alarm prompt information to inform operators that the currently detected heat exchange tube is possibly damaged.
The monitoring system of the heat exchange tube of the evaporator in the embodiment of the specification monitors the vibration of the heat exchange tube by installing the vibration sensor on the heat exchange tube of the seawater desalination steam generator, so that the vibration data of the heat exchange tube can be timely and accurately acquired, and the possible damage phenomenon of the heat exchange tube can be early warned according to the analysis result of the vibration data, so that the safe operation of the seawater desalination steam generator is improved.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present specification, and is not intended to limit the present specification. Various modifications and alterations to this description will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification should be included in the scope of the claims of the present specification.
Claims (10)
1. A monitoring system for an evaporator heat exchange tube is characterized by comprising a vibration sensor, a data acquisition unit and a data analysis platform,
the vibration sensor is arranged on a heat exchange tube of the evaporator to detect and obtain a vibration signal of the heat exchange tube;
the data acquisition unit is connected with the vibration sensor and is used for acquiring the vibration signal output by the vibration sensor so as to obtain vibration data of the heat exchange tube;
and the data analysis platform is connected with the data acquisition unit and analyzes the vibration data output by the data acquisition unit to output a corresponding analysis result.
2. The system of claim 1,
the vibration sensor is a piezoelectric acceleration sensor so as to convert an acceleration signal generated when the heat exchange tube vibrates into a vibration signal of a voltage signal; alternatively, the first and second electrodes may be,
the vibration sensor is a current type acceleration sensor, so that an acceleration signal generated when the heat exchange tube vibrates is converted into a vibration signal of a current signal.
3. The system of claim 2, wherein when the vibration sensor is a piezoelectric acceleration sensor, the system further comprises:
and the constant current source adapter is connected between the vibration sensor and the data acquisition unit, amplifies and filters the voltage signal output by the vibration sensor, converts the voltage signal into a current signal, and transmits the current signal to the data acquisition unit in a long distance.
4. The system of claim 1, wherein said vibration sensors are provided in plural numbers, and are respectively mounted at plural vibration measuring points of each of said heat exchange pipes.
5. The system of claim 4, wherein the plurality of vibration stations are disposed at least at the fluid inlet end of the heat exchange tube, the fluid outlet end of the heat exchange tube, and intermediate positions between the fluid inlet end and the fluid outlet end.
6. The system according to claim 1, wherein the vibration sensor is a cylinder, and an axial direction of the cylinder is perpendicular to an axial direction of the heat exchange pipe.
7. The system of claim 1, wherein signal cables are connected between the data collector and the vibration sensors, and the signal cables correspond to the vibration sensors one to one.
8. The system of claim 7, wherein the signal cable is horizontal to the axial direction of the heat exchange pipe from the outlet direction of the vibration sensor.
9. The system of claim 7, wherein the signal cable is externally coated with an insulating layer and a waterproof layer, and the insulating layer and the waterproof layer are integrally packaged with a housing of the vibration sensor.
10. The system of any one of claims 1 to 9, further comprising:
the mounting support is mounted on a vibration measuring point of the heat exchange tube, and the vibration sensor is mounted on a supporting surface of the mounting support.
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| CN114383261A (en) * | 2021-12-21 | 2022-04-22 | 青岛海尔空调器有限总公司 | Air conditioner detection method, control device, air conditioner, electronic equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114383261A (en) * | 2021-12-21 | 2022-04-22 | 青岛海尔空调器有限总公司 | Air conditioner detection method, control device, air conditioner, electronic equipment and storage medium |
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