阅读说明：本技术 一种基于振动频谱分析的泵汽蚀报警装置及检测方法 (Pump cavitation alarm device and detection method based on vibration spectrum analysis ) 是由 刘黎伟 宋寅 于 2020-05-06 设计创作，主要内容包括：本发明提供了一种基于振动频谱分析的泵汽蚀报警装置,包括：振动加速度传感器,设置在叶片泵的蜗壳位置处；压力变送器,设置在叶片泵的入口处；电流变送器,通过电缆与叶片泵连接；以及数据采集和处理单元,所述数据采集和处理单元通过电缆分别与所述振动加速度传感器、所述压力变送器和所述电流变送器连接。还提供一种基于振动频谱分析的泵汽蚀检测方法。根据本发明的实施方式,通过对叶片泵振动频域波形信号分析获得故障特征值例如喘振、汽蚀、水力缺陷,再结合叶片泵入口压力特征值和电机输入电流特征值的变化情况,综合判断确定叶片泵是否发生汽蚀故障。利用振动故障信号来分析叶片泵的汽蚀故障,便于叶片泵现场汽蚀故障的早期处置。(The invention provides a pump cavitation alarm device based on vibration spectrum analysis, which comprises: the vibration acceleration sensor is arranged at the position of a volute of the vane pump; the pressure transmitter is arranged at the inlet of the vane pump; the current transducer is connected with the vane pump through a cable; and the data acquisition and processing unit is respectively connected with the vibration acceleration sensor, the pressure transmitter and the current transmitter through cables. A pump cavitation detection method based on vibration spectrum analysis is also provided. According to the embodiment of the invention, fault characteristic values such as surge, cavitation and hydraulic defects are obtained through analyzing the vibration frequency domain waveform signals of the vane pump, and then whether the vane pump has cavitation faults or not is comprehensively judged and determined by combining the change conditions of the inlet pressure characteristic value of the vane pump and the input current characteristic value of the motor. The cavitation fault of the vane pump is analyzed by utilizing the vibration fault signal, so that the early treatment of the cavitation fault on the vane pump site is facilitated.)

1. A pump cavitation alarm device based on vibration spectrum analysis is characterized by comprising:

the vibration acceleration sensor (2) is arranged at the position of a volute of the vane pump (1);

the pressure transmitter (3) is arranged at the inlet of the vane pump (1);

the current transmitter (4) is connected with the vane pump (1) through a cable; and

and the data acquisition and processing unit is respectively connected with the vibration acceleration sensor (2), the pressure transmitter (3) and the current transmitter (4) through cables.

2. A pump cavitation alarm device as claimed in claim 1, characterized in that the data acquisition and processing unit comprises: the intelligent protection system comprises a data acquisition station (9) and an intelligent protection terminal (10), wherein the intelligent protection terminal is connected with the data acquisition station (9) through a cable; and the data acquisition station (9) is respectively connected with the vibration acceleration sensor (2), the pressure transmitter (3) and the current transmitter (4) through cables.

3. A pump cavitation alarm device as claimed in claim 2, wherein the data acquisition and processing unit further includes: the intelligent protection system comprises an electronic touch screen (11) and a waterproof box (12), wherein the electronic touch screen (11) is installed on a box door of the waterproof box (12), and the electronic touch screen (11) is connected with the intelligent protection terminal (10); the data acquisition station (9) and the intelligent protection terminal (10) are installed on a DIN guide rail in the waterproof box (12).

4. A pump cavitation alarm device as claimed in claim 3, wherein the data acquisition and processing unit further includes: the waterproof box comprises a waterproof box support (13), and the waterproof box (12) is fixed on a base of the vane pump (1) through the waterproof box support (13).

5. The pump cavitation alarm device as claimed in claim 1, characterized in that the vibration acceleration sensor (2) is installed at the connection end face of the throat housing spiral reducer and the diffuser pipe of the vane pump (1).

6. Pump cavitation alarm device according to claim 1, characterized in that the current transducer (4) is connected to the motor junction box of the vane pump (1) by a flame-retardant power cable.

7. A pump cavitation detection method based on vibration spectrum analysis, which adopts the pump cavitation alarm device according to any one of claims 1-6, characterized by comprising the steps of:

s101: acquiring a vibration original waveform signal at a volute of a vane pump (1) in real time through a vibration acceleration sensor (2), transmitting the vibration original waveform signal to a data acquisition and processing unit through a cable, and converting the vibration original waveform signal into a vibration frequency domain waveform signal through the data acquisition and processing unit;

s102: the inlet pressure signal of the vane pump (1) is collected in real time through a pressure transmitter (3), and is transmitted to a data collecting and processing unit through a cable;

s103: the method comprises the steps that an input current signal of a vane pump (1) is collected in real time through a current transducer (4), and the input current signal is transmitted to a data collecting and processing unit through a cable;

s104: extracting and caching a cavitation fault vibration characteristic value in the vibration frequency domain waveform signal, an inlet pressure characteristic value in the inlet pressure signal and an input current characteristic value in the input current signal through a data acquisition and processing unit;

s105: and utilizing a data acquisition and processing unit to find peak energy in the energy accumulated in the frequency interval for analysis and judgment on the extracted cavitation fault vibration characteristic value, the inlet pressure characteristic value and the input current characteristic value, and outputting a cavitation fault conclusion of the vane pump (1).

8. The pump cavitation detection method according to claim 7, characterized in that in step S101, a vibration acceleration sensor (2) collects a vibration original waveform signal at a connection end face of a throat portion housing spiral reducer and a diffuser of the vane pump (1) in real time.

9. The pump cavitation detection method of claim 8 wherein the vibration raw waveform signal is converted to a vibration frequency domain waveform signal by a data acquisition station (9).

10. The pump cavitation detection method according to claim 9, further comprising step S106: and transmitting the cavitation failure conclusion of the vane pump (1) to an electronic touch screen (11) for displaying.

Technical Field

The invention relates to the field of cavitation detection, in particular to a pump cavitation alarm device based on vibration spectrum analysis and a pump cavitation detection method adopting the device.

Background

During the on-site use process of the vane pump by a user, cavitation faults can occur due to design and manufacturing defects, mismatching of device characteristics, inlet pressure lower than saturated gasification pressure and the like. When a cavitation failure occurs in a vane pump, a number of negative effects occur, such as: the working surface of the flow passage component of the vane pump is damaged in different degrees according to different cavitation degrees, so that the service life of the flow passage component of the vane pump is greatly shortened; severe vibration can be caused by deep cavitation, vibration energy is acted on the working surface of the flow passage component and is transmitted along the shaft extension direction, and the damage of parts such as a shaft seal, a bearing, an oil seal and the like which are matched with a transmission shaft can be caused; the cluster bubble group causing cavitation can block the flow passage of the suction inlet of the vane pump, which causes great reduction of the working performance of the vane pump.

Different cavitation stages can affect the service life, hydraulic performance and overall reliability of the vane pump to different degrees, so that the regular detection of the cavitation state of the vane pump is an effective means for effectively avoiding cavitation faults and improving the product performance and reliability. At present, a special closed flow-lift performance testing device and a special closed flow-lift performance testing system for the vane pump are needed for cavitation alarm of the vane pump in the industry, and the occupied area is large, the investment is high, so that the method can only be applied to factory testing of the vane pump. A special tool does not exist for the field detection of the cavitation failure of the vane pump, only when the cavitation is developed to a serious stage, field maintainers can identify the cavitation failure by the traditional methods of 'watching, smelling, asking, cutting' and the like through human experience, and early warning and improvement of the cavitation failure of the vane pump are not used.

Disclosure of Invention

In view of this, the present invention is directed to providing an alarm device for detecting pump cavitation based on vibration spectrum analysis and a pump cavitation detection method using the alarm device.

In one aspect, a pump cavitation alarm device based on vibration spectrum analysis is provided, including:

the vibration acceleration sensor is arranged at the position of a volute of the vane pump;

the pressure transmitter is arranged at the inlet of the vane pump;

the current transducer is connected with the vane pump through a cable; and

and the data acquisition and processing unit is respectively connected with the vibration acceleration sensor, the pressure transmitter and the current transmitter through cables.

In one embodiment, the data acquisition and processing unit comprises: the intelligent protection terminal is connected with the data acquisition station through a cable; the data acquisition station is respectively connected with the vibration acceleration sensor, the pressure transmitter and the current transmitter through cables.

In one embodiment, the data acquisition and processing unit further comprises: the intelligent protection terminal comprises an electronic touch screen and a waterproof box, wherein the electronic touch screen is installed on a box door of the waterproof box and is connected with the intelligent protection terminal; the data acquisition station and the intelligent protection terminal are installed on a DIN guide rail in the waterproof box.

In one embodiment, the data acquisition and processing unit further comprises: the waterproof box is fixed on the base of the vane pump through the waterproof box support.

In one embodiment, the vibration acceleration sensor is installed at the connecting end face of the spiral reducer and the diffusion pipe of the throat shell of the vane pump.

In one embodiment, the current transducer is connected to a motor junction box of the vane pump via a flame retardant power cable.

In another aspect, a pump cavitation detection method based on vibration spectrum analysis is further provided, in which the pump cavitation alarm device described above is adopted, and includes the steps of:

s101: acquiring a vibration original waveform signal at a volute of a vane pump in real time through a vibration acceleration sensor, transmitting the vibration original waveform signal to a data acquisition and processing unit through a cable, and converting the vibration original waveform signal into a vibration frequency domain waveform signal through the data acquisition and processing unit;

s102: the method comprises the following steps of acquiring an inlet pressure signal of a vane pump in real time through a pressure transmitter, and transmitting the inlet pressure signal to a data acquisition and processing unit through a cable;

s103: acquiring an input current signal of the vane pump in real time through a current transducer, and transmitting the input current signal to a data acquisition and processing unit through a cable;

s104: extracting and caching a cavitation fault vibration characteristic value in the vibration frequency domain waveform signal, an inlet pressure characteristic value in the inlet pressure signal and an input current characteristic value in the input current signal through a data acquisition and processing unit;

s105: and utilizing a data acquisition and processing unit to find peak energy in the energy accumulated in the frequency interval for analysis and judgment on the extracted cavitation fault vibration characteristic value, the inlet pressure characteristic value and the input current characteristic value, and outputting a cavitation fault conclusion of the vane pump.

In one embodiment, in step S101, a vibration acceleration sensor is used to collect a vibration original waveform signal at a connection end face of a spiral reducer of a throat casing of the vane pump and a diffusion tube in real time.

In one embodiment, the vibration raw waveform signal is converted into a vibration frequency domain waveform signal by a data acquisition station.

In one embodiment, the method further comprises step S106: and transmitting the cavitation fault conclusion of the vane pump to an electronic touch screen for displaying.

According to the embodiment of the invention, fault characteristic values such as surge, cavitation and hydraulic defects are obtained through analyzing the vibration frequency domain waveform signals of the vane pump, and then whether the vane pump has cavitation faults or not is comprehensively judged and determined by combining the change conditions of the inlet pressure characteristic value of the vane pump and the input current characteristic value of the motor. The cavitation failure of the vane pump is analyzed by using the vibration failure signal, the early treatment of the on-site cavitation failure of the vane pump is facilitated, and the problems that the original cavitation monitoring device is high in investment and large in occupied area, cannot be applied to on-site cavitation alarm of the vane pump and on-site cavitation monitoring of the traditional vane pump, excessive dependence on experience is considered, and the cavitation failure judgment is not timely are solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic diagram of a pump cavitation alarm arrangement in accordance with an embodiment of the present invention;

fig. 2 shows a schematic diagram of a data acquisition and processing unit in a pump cavitation alarm device according to an embodiment of the present invention.

Reference numerals: the method comprises the following steps of 1-a vane pump, 2-a vibration acceleration sensor, 3-a pressure transmitter, 4-a current transmitter, 5-a flame-retardant power cable, 6-a shielding control cable, 7-a network signal line, 8-a sensor cable, 9-a data acquisition station, 10-an intelligent protection terminal, 11-an electronic touch screen, 12-a waterproof box and 13-a waterproof box support.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

An embodiment of the present invention will be described in detail below with reference to fig. 1-2.

As shown in fig. 1, a pump cavitation alarm device based on vibration spectrum analysis includes: the device comprises a vibration acceleration sensor 2, a pressure transmitter 3, a current transmitter 4 and a data acquisition and processing unit. The vibration acceleration sensor 2 is arranged at the position of the volute of the vane pump 1 and used for measuring the vibration original waveform of the end face of the volute section of the vane pump 1 in the radial horizontal direction. The pressure transmitter 3 is arranged at the inlet of the vane pump 1 and is used for measuring a standard pressure signal at the inlet of the vane pump 1; preferably, it is mounted at the inlet flange of the vane pump 1 by means of a screw thread/flange. The current transducer 4 is connected with the vane pump 1 through a sensor cable 8 and is used for measuring a current signal input into the vane pump 1; preferably, the current transducer 4 is connected with a motor junction box of the vane pump 1 through a flame-retardant power cable 5, and the current transducer 4 collects current signals input into the vane pump 1 by the motor. The data acquisition and processing unit is respectively connected with the vibration acceleration sensor 2, the pressure transmitter 3 and the current transmitter 4 through cables and is used for acquiring, storing and processing signals from the vibration acceleration sensor 2, the pressure transmitter 3 and the current transmitter 4.

Preferably, the vibration acceleration sensor 2 is mounted at a connection end face of the throat housing spiral reducer and the diffuser pipe of the vane pump 1 by a stud bolt.

In some embodiments, as shown in fig. 2, the data acquisition and processing unit comprises: the system comprises a data acquisition station 9 and an intelligent protection terminal 10, wherein the data acquisition station 9 is respectively connected with a vibration acceleration sensor 2, a pressure transmitter 3 and a current transmitter 4 through cables and is used for receiving, storing and preprocessing vibration original waveform signals, inlet pressure standard signals and input current signals from the vibration acceleration sensor 2, the pressure transmitter 3 and the current transmitter 4, preprocessing the vibration original waveform signals from the vibration acceleration sensor 2 into vibration frequency domain waveform signals, and extracting and caching cavitation fault vibration characteristic values in the vibration frequency domain waveform signals; the intelligent protection terminal 10 is connected with the data acquisition station 9 through the shielding control cable 6 and is used for analyzing and processing the cavitation fault vibration characteristic value, the inlet pressure characteristic value and the input current characteristic value from the data acquisition station 9.

In some embodiments, the data acquisition and processing unit further comprises: an electronic touch screen 11 and a waterproof case 12. The waterproof box 12 is provided with a box door which can be opened; the electronic touch screen 11 is embedded on the door of the waterproof box 12, and meanwhile, the electronic touch screen 11 is connected with the intelligent protection terminal 10 through the network signal line 7; the data acquisition station 9 and the intelligent protection terminal 10 are mounted on a DIN rail in a waterproof box 12.

In some embodiments, the data acquisition and processing unit further comprises: the waterproof box support 13, the waterproof box support 13 sets up in the below of waterproof box 12, and waterproof box 12 passes through waterproof box support 13 and installs on the metal base of impeller pump 1.

According to the embodiment of the invention, a vibration acceleration sensor 2 is used for acquiring a vibration original waveform signal of a vane pump 1 in real time, a data acquisition and processing unit is used for converting the vibration original waveform signal into a vibration frequency domain waveform signal, and a cavitation fault vibration characteristic value is extracted from the vibration frequency domain signal; meanwhile, an inlet pressure signal and an input current signal of the vane pump 1 are acquired in real time through the pressure transmitter 3 and the current transmitter 4, and an inlet pressure characteristic value and an input current characteristic value are acquired through the data acquisition and processing unit; and finally, the data acquisition and processing unit comprehensively analyzes and judges the cavitation fault characteristic value, the inlet pressure characteristic value and the input current characteristic value and outputs a cavitation fault conclusion of the vane pump 1. In addition, the cavitation fault conclusion and the alarm state can be displayed on site through the electronic touch screen 11.

The invention also provides a pump cavitation detection method based on vibration spectrum analysis, which adopts the pump cavitation alarm device and comprises the following steps:

s101: the method comprises the steps of acquiring a vibration original waveform signal at a volute of a vane pump 1 in real time through a vibration acceleration sensor 2, transmitting the vibration original waveform signal to a data acquisition and processing unit through a cable, and converting the vibration original waveform signal into a vibration frequency domain waveform signal through the data acquisition and processing unit

Acquiring a vibration original waveform signal at the volute position of the vane pump 1 in real time by using the vibration acceleration sensor 2, and transmitting the vibration original waveform signal into the data acquisition and processing unit through a cable; the data acquisition and processing unit filters disordered waveforms of the acquired original waveform signals, selects waveform signal characteristic values in different frequency intervals and performs Fourier transform, and accordingly converts the vibration original waveform signals into vibration frequency domain waveform signals.

S102: the inlet pressure signal of the vane pump 1 is collected in real time by the pressure transmitter 3 and transmitted to the data collecting and processing unit by the cable

Meanwhile, an inlet pressure signal of the vane pump 1 is acquired in real time through the pressure transmitter 3 and is transmitted to the data acquisition and processing unit through a cable, and the data acquisition and processing unit caches the inlet pressure signal.

S103: the input current signal of the vane pump 1 is collected in real time through the current transducer 4 and is transmitted to the data collecting and processing unit through a cable

Meanwhile, an input current signal of the vane pump 1, such as an input current signal of the motor to the vane pump 1, is acquired in real time through the current transducer 4, and is transmitted to the data acquisition and processing unit through a cable, and the data acquisition and processing unit caches the input current signal.

S104: extracting and buffering the cavitation fault vibration characteristic value in the vibration frequency domain waveform signal, the inlet pressure characteristic value in the inlet pressure signal and the input current characteristic value in the input current signal through a data acquisition and processing unit

S105: the data acquisition and processing unit is used for analyzing and judging the extracted cavitation fault vibration characteristic value, the extracted inlet pressure characteristic value and the extracted input current characteristic value by finding peak energy in the energy accumulated in the frequency interval, and outputting a cavitation fault conclusion of the vane pump 1

The data acquisition and processing unit is used for analyzing and judging the peak energy found in the energy accumulated in the frequency interval by extracting the cached cavitation fault vibration characteristic value, inlet pressure characteristic value and input current characteristic value, and outputting a cavitation fault conclusion of the vane pump 1, such as: no cavitation, serious cavitation and over cavitation.

In some embodiments, the method further comprises step S106: the data acquisition and processing unit transmits the cavitation fault conclusion of the vane pump 1 to the electronic touch screen 11 for display through the network signal line 7, so that the on-site display is facilitated.

In some embodiments, in step S101, a vibration original waveform signal at a connection end face of the throat casing spiral reducer and the diffuser of the vane pump 1 is acquired in real time by the vibration acceleration sensor 2.

In some embodiments, the vibration original waveform signal is converted into a vibration frequency domain waveform signal through the data acquisition station 9, and a cavitation fault vibration characteristic value in the vibration frequency domain signal is extracted and cached, and then the stored cavitation fault characteristic value is transmitted to the intelligent protection terminal 10 through the shielding control cable 6; and finally, the intelligent protection terminal 10 finds the peak energy in the energy accumulated in the frequency interval for analyzing and judging the cavitation fault characteristic value, the inlet pressure characteristic value and the input current characteristic value, and outputs a cavitation fault conclusion of the vane pump 1.

According to the embodiment of the invention, fault characteristic values such as surge, cavitation and hydraulic defect are obtained by analyzing the vibration frequency domain waveform signal of the vane pump 1, and then whether the vane pump 1 has cavitation fault or not is comprehensively judged and determined by combining the change conditions of the inlet pressure characteristic value of the vane pump 1 and the motor input current characteristic value. The cavitation failure of the vane pump 1 is analyzed by using the vibration failure signal, the early treatment of the field cavitation failure of the vane pump 1 is facilitated, and the problems that the original cavitation monitoring device is high in investment and large in occupied area, cannot be applied to field cavitation alarm of the vane pump 1 and field cavitation monitoring of the traditional vane pump 1, excessive dependence on experience is considered, and cavitation failure judgment is not timely are solved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.