Centrifugal pump balance disc abrasion condition monitoring system

Abstract

The utility model relates to a system for monitoring the abrasion condition of a balance disc of a centrifugal pump. The wear condition monitoring system for the balance disc of the centrifugal pump is characterized in that a supporting outer cover is mounted outside a coupling for connecting the centrifugal pump and a motor and wraps the coupling; the photoelectric sensor is installed on the inner side of the top of the supporting outer cover and is perpendicular to the coupler, the output end of the photoelectric sensor is connected with the signal conversion module, and the output end of the signal conversion module is connected with the alarm. According to the scheme, the displacement distance of the centrifugal pump coupler can be detected through the aluminum foil, the photoelectric sensor and the signal conversion module, online detection of the displacement distance of the centrifugal pump coupler is achieved, the abrasion conditions of a balance disc and a balance ring are judged, an alarm is given, damage to other parts in the centrifugal pump is avoided, the maintenance frequency is reduced, and the maintenance efficiency is improved. The service life of the centrifugal pump is prolonged.

Description

Technical Field

[0001] This application relates to the field of balance disc wear monitoring technology, and in particular to a centrifugal pump balance disc wear monitoring system. Background Technology

[0002] In the mining industry, centrifugal pumps are the main drainage equipment. Reducing the maintenance frequency and extending the service life of centrifugal pumps is an important research direction for mine drainage systems. During operation, the impeller rotation of a centrifugal pump generates axial thrust. This axial force is balanced by a balance disc and balance ring. The balance disc is mounted on the main shaft, and the balance ring is fixed to the pump casing, with a certain clearance between them. When the centrifugal pump is running, high-pressure liquid is sprayed from the clearance of the throttling ring onto the balance disc, forming a water film between the balance disc and the balance ring. This ensures the balance of axial force while reducing wear between the balance disc and the balance ring. If no water film forms between the balance disc and the balance ring, wear is likely to occur. When the wear reaches a certain level, the axial force acts on internal components such as the impeller, guide vanes, and water seal ring, easily leading to wear of internal components and main shaft jamming.

[0003] Therefore, it is necessary to provide an online monitoring and alarm device for the wear of the balance disc and balance ring to solve the problem of damage to internal components of the centrifugal pump caused by severe wear of the balance disc and balance ring during operation, to avoid the expansion of accidents caused by uneven axial force matching, to maximize the service life of the centrifugal pump, and to reduce the frequency of major overhauls. Utility Model Content

[0004] To address or partially address the problems existing in related technologies, this application provides a centrifugal pump balance disc wear monitoring system, which aims to solve the problem of online detection of centrifugal pump coupling axial movement distance.

[0005] This application provides a centrifugal pump balance disc wear monitoring system, including:

[0006] Aluminum foil, photoelectric sensor, signal conversion module, alarm and supporting cover;

[0007] The support cover is installed outside the coupling connecting the centrifugal pump and the motor, and encloses the coupling.

[0008] Aluminum foil is pasted on the coupling. The photoelectric sensor is installed on the inside of the top of the support cover. The photoelectric sensor is perpendicular to the coupling. The output of the photoelectric sensor is connected to the signal conversion module. The output of the signal conversion module is connected to the alarm.

[0009] The signal conversion module includes a reset module, a bias adjustment module, a gating module, a quenching module, a sensing module, a comparison module, and a control module;

[0010] The reset module is connected to the input terminal of the avalanche tube control circuit of the photoelectric sensor, and is used to directly set the initial circuit state of the avalanche tube of the photoelectric sensor to the working voltage.

[0011] The gating module is connected to the input terminal of the avalanche tube control circuit of the photoelectric sensor. It is used to control the bias voltage at one end of the avalanche tube and to control the working time of the avalanche tube according to the set gating time.

[0012] The sensing module is connected to the output end of the photoelectric sensor to sense the photocurrent at the output end, realize the conversion of the photocurrent into photovoltage, and achieve the function of signal conversion.

[0013] The bias adjustment module is connected to the output of the avalanche tube control circuit of the photoelectric sensor and is used for the reverse bias voltage control of the avalanche tube array, so that all avalanche tubes in the array work under a suitable bias voltage.

[0014] The comparator module is connected to the output of the photoelectric sensor and is used to convert the analog voltage signal generated by the avalanche tube into a digital signal.

[0015] The control module connects the comparison module and the quenching module. The quenching module is installed between the comparison module and the bias adjustment module. The control module determines whether the detected digital signal exceeds the preset distance threshold and sends the response signal to the next-level circuit. At the same time, it feeds back to the quenching circuit to control the operation of the quenching circuit and adjust the bias voltage of the avalanche tube to prevent excessive avalanche effect from causing irreversible damage to the detection device.

[0016] Optionally, in some implementations, the photoelectric sensor is a laser rangefinder.

[0017] Optionally, in some implementations, the alarm uses an audible and visual alarm.

[0018] The technical solution provided in this application may include the following beneficial effects:

[0019] The centrifugal pump coupling misalignment distance is detected by using aluminum foil, photoelectric sensors, and a signal conversion module. The signal conversion module's reset module, quenching module, comparison module, and control module are used to process and convert the photoelectric sensor signal, enabling online detection of the centrifugal pump coupling misalignment distance. This allows for the determination of wear on the balance disc and balance ring, and the issuance of alarms to prevent damage to other internal components of the centrifugal pump, reduce maintenance frequency, and extend the service life of the centrifugal pump.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0021] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0022] Figure 1 This is a schematic diagram of the centrifugal pump balance disc wear monitoring system shown in the embodiments of this application;

[0023] Figure 2 This is an installation schematic diagram of a centrifugal pump balance disc wear monitoring system shown in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the signal conversion module circuit framework of a centrifugal pump balance disc wear monitoring system shown in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the signal conversion module circuit of a centrifugal pump balance disc wear monitoring system shown in an embodiment of this application.

[0026] Reference numerals: 1-Aluminum foil, 2-Photoelectric sensor, 3-Signal conversion module, 4-Alarm, 5-Support cover. Detailed Implementation

[0027] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0028] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] During the operation of a centrifugal pump, the impeller rotation generates axial thrust. This axial force is balanced by a balance disc and a balance ring. The balance disc is mounted on the main shaft, and the balance ring is fixed to the pump casing. There is a certain clearance between the two. When the centrifugal pump is running, high-pressure liquid is sprayed from the gap of the throttling ring onto the balance disc, forming a water film between the balance disc and the balance ring. This ensures the balance of axial force while reducing wear between the balance disc and the balance ring. If no water film is formed between the balance disc and the balance ring, wear is likely to occur. When the wear reaches a certain level, the axial force acts on the impeller, guide vanes, water seal ring, and other components inside the centrifugal pump, which can easily lead to wear of internal components and jamming of the main shaft.

[0032] To address the aforementioned issues, this application provides a centrifugal pump balance disc wear monitoring system. This system utilizes aluminum foil, a photoelectric sensor, and a signal conversion module to detect the axial movement distance of the centrifugal pump coupling. The signal conversion module employs a reset module, a quenching module, a comparison module, and a control module to process and convert the photoelectric sensor signal, enabling online detection of the centrifugal pump coupling axial movement distance. This allows for the determination of the wear condition of the balance disc and balance ring, and the issuance of an alarm, preventing damage to other internal components of the centrifugal pump, reducing maintenance frequency, and extending the service life of the centrifugal pump.

[0033] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] Figure 1 This is a schematic diagram of the centrifugal pump balance disc wear monitoring system shown in the embodiments of this application.

[0036] See Figure 1 A centrifugal pump balance disc wear monitoring system, comprising:

[0037] 1. Aluminum foil; 2. Photoelectric sensor; 3. Signal conversion module; 4. Alarm; 5. Support cover;

[0038] A support cover 5 is installed outside the coupling connecting the centrifugal pump and the motor, enclosing the coupling. Aluminum foil 1 is attached to the coupling. A photoelectric sensor 2 and a signal conversion module 3 are installed on the top inner side of the support cover 5. The photoelectric sensor 2 is perpendicular to the coupling and directly opposite the aluminum foil 1. The output of the photoelectric sensor 2 is connected to the signal conversion module 3, and the output of the signal conversion module 3 is connected to an alarm 4. The photoelectric sensor 2 is a laser rangefinder, and the alarm 4 is an audible and visual alarm. In use, a preset threshold distance for centrifugal pump coupling misalignment is set. The photoelectric sensor 2 monitors the misalignment distance, converts the detection result into an electrical signal, and transmits it to the signal converter. The signal conversion module 3 processes the electrical signal. When the centrifugal pump coupling misalignment distance reaches the preset threshold, an alarm signal is sent to the alarm 4, triggering an audible and visual alarm.

[0039] like Figure 3 As shown, the signal conversion module includes: a reset module, a bias adjustment module, a gating module, a quenching module, a sensing module, a comparison module, and a control module;

[0040] The signal conversion module can be added or removed according to the actual application circuit;

[0041] The reset module is connected to the input terminal of the avalanche tube control circuit of photoelectric sensor 2, and is used to directly set the initial circuit state of the avalanche tube of photoelectric sensor 2 to the working voltage. The gate control module is connected to the input terminal of the avalanche tube control circuit of photoelectric sensor 2, and is used to control the bias voltage at one end of the avalanche tube. According to the set gate time, it can control the working time of the avalanche tube. The sensing module is connected to the output terminal of photoelectric sensor 2, and is used to sense the photocurrent at the output terminal, realize the conversion of photocurrent into photovoltage, and achieve the function of signal conversion. The bias adjustment module is connected to the output of the avalanche tube control circuit of photoelectric sensor 2, and is used for reverse bias voltage control of the avalanche tube array to ensure that all avalanche tubes in the array operate under a suitable bias voltage. The comparator module is connected to the output of photoelectric sensor 2 and is used to convert the analog voltage signal generated by the avalanche tube into a digital signal. The control module is connected to the comparator module and the quenching module. The quenching module is installed between the comparator module and the bias adjustment module. The control module determines whether the detected digital signal exceeds a preset distance threshold and sends the response signal to the next stage circuit. At the same time, it feeds back to the quenching circuit to control the operation of the quenching circuit, adjusts the bias voltage of the avalanche tube, and prevents excessive avalanche effect from causing irreversible damage to the detection device.

[0042] Example 2

[0043] Signal conversion module 3 includes a reset module, a quenching module, a comparison module, and a control module;

[0044] The reset module is connected to the input terminal of the avalanche tube control circuit of photoelectric sensor 2, and is used to directly set the initial circuit state of the avalanche tube of photoelectric sensor 2 to the working voltage. The comparison module is connected to the output terminal of photoelectric sensor 2, and is used to convert the analog voltage signal generated by the avalanche tube into a digital signal. The control module is connected to the comparison module and the quenching module. The quenching module is installed between the comparison module and the bias adjustment module. The control module determines whether the detected digital signal exceeds the preset distance threshold and sends the response signal to the next stage circuit. At the same time, it feeds back to the quenching circuit to control the operation of the quenching circuit, adjusts the bias voltage of the avalanche tube, and prevents the excessive avalanche effect from causing irreversible damage to the detection device.

[0045] like Figure 4 As shown, the quenching module adopts a capacitive sensing interface quenching circuit, which not only has a fast detection speed but also boasts advantages such as simple circuitry and small footprint. The dual-port detection circuit allows for flexible and variable setting of the detection voltage, making it suitable for more complex environments. In the quenching reset circuit, when the EN control signal arrives, the gated MOSFET M1 starts working; the STOP signal and the RES reset signal simultaneously control the quenching MOSFET M2, enabling active quenching of the GM-APD based on circuit conditions; the reset signal RES alone controls MOSFET M3 to achieve the readout circuit state reset function.

[0046] In the comparison detection circuit, a differential amplifier circuit is composed of M4, M5, M6, M7, and M8. The Vcc terminal provides additional current. M5 and M6 are configured as a pair of mirrored MOSFETs with identical parameters, while the channel width-to-length ratio of M7 and M8 is set to 1:N, where N is a positive integer greater than 1. The voltages at the gates of M5 and M6 are V1 and V2, respectively. V1 is derived from the anode voltage of the GM-APD, and V2 is set by the comparison voltage setting circuit. When V1 ≤ V2, the STOP terminal outputs a low level; when V1 > V2, the STOP terminal outputs a high level.

[0047] The buffer shaping circuit consists of two-stage inverter circuits. Based on the principle that the physical layer electrical signal takes a certain amount of time to pass through the inverter, the photon detection signal generated in the circuit is buffered and shaped. The STOP signal output from the output terminal is fed back to the quenching and reset circuit to complete active quenching, and transmitted to the control module. The control module judges whether the detected digital signal exceeds the preset distance threshold. When the centrifugal pump coupling axial movement distance reaches the preset threshold, an alarm signal is sent to alarm 4 to issue an audible and visual alarm.

[0048] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A centrifugal pump balance disk wear condition monitoring system, characterized by, The utility model relates to a kind of centrifugal pump balance disc wear condition monitoring system, including: aluminum foil (1), photoelectric sensor (2), signal conversion module (3), alarm (4) and support cover (5);The support cover (5) is installed outside the coupling connected with centrifugal pump and motor, and the coupling is wrapped;The aluminum foil (1) is pasted on coupling, and photoelectric sensor (2) and signal conversion module (3) are installed in the top inside of support cover (5), photoelectric sensor (2) is perpendicular to coupling, and it is opposite aluminum foil (1), and the output end of photoelectric sensor (2) is connected with signal conversion module (3), and the output end of signal conversion module (3) is connected with alarm (4);The signal conversion module (3) includes, reset module, quenching module, comparison module and control module The reset module is connected with the input end of avalanche tube control circuit of photoelectric sensor (2), and is used for the module that the initial circuit state of avalanche tube of photoelectric sensor (2) is directly set as working voltage; The comparison module is connected with the output end of photoelectric sensor (2), and is used for converting the voltage signal analog quantity generated by avalanche tube into digital signal; Control module is connected with comparison module and quenching module, and the quenching module is installed between comparison module and bias adjustment module, and the control module is through judging whether the detected digital signal exceeds preset distance threshold value, and the response signal is given to lower circuit, and is fed back to quenching circuit simultaneously, controls quenching circuit to work, adjusts the bias voltage of avalanche tube, and prevents the irreversible damage of detection device caused by excessive avalanche effect. The signal conversion module (3) further includes: Bias adjustment module, gate control module and sensing module; The gate control module is connected with the input end of avalanche tube control circuit of photoelectric sensor (2), and is used for controlling the bias of one end of avalanche tube, and reaches the effect of controlling the working time of avalanche tube according to the set gate control time; The sensing module is connected with the output end of photoelectric sensor (2), and is used for sensing the photocurrent of output end, realizes the conversion of photocurrent into photovoltage, and reaches the effect of signal conversion; 2. The centrifugal pump balance plate wear condition monitoring system of claim 1, wherein, The bias adjustment module is connected with the output end of avalanche tube control circuit of photoelectric sensor (2), and is used for the reverse bias voltage control of avalanche tube array, so that all avalanche tubes in array work under suitable bias voltage.

3. The centrifugal pump balance disc wear condition monitoring system according to claim 1, wherein: the photoelectric sensor (2) is a laser ranging sensor.

4. The centrifugal pump balance disc wear condition monitoring system according to claim 1, wherein: the alarm (4) is an audible and visual alarm. ​ ​ ​ ​ ​ ​

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