Rotary mechanism dynamic seal detection device and method

Abstract

This invention relates to a dynamic seal detection device and method for rotating mechanisms. The invention includes a stator component; a rotor component that rotates relative to the stator component, the rotor component being connected to a rotating shaft connected to a motor; an expansion component, annular in shape and disposed between the stator component and the rotor component; multiple position sensors disposed between the stator component and the rotor component, each position sensor's detection end extending axially and contacting one axial end of the expansion component; and a dynamic seal ring disposed between the stator component and the rotor component and close to the expansion component. After the dynamic seal ring fails, the expansion component absorbs liquid entering from the dynamic seal ring side and expands to push the detection ends of each position sensor. This invention reduces liquid damage to the rotating mechanism, significantly improving the safety and reliability of the equipment.

Description

Technical Field

[0001] This invention relates to the field of rotating device technology, and in particular to a dynamic seal detection device and method for rotating mechanisms. Background Technology

[0002] Rotary mechanisms have a wide range of applications. Generally speaking, a rotary mechanism can be understood as a mechanical device used to achieve rotational motion. Its core function is to transmit power or perform work tasks through the cooperation of a fixed component (stator) and a rotating component (rotor). This mechanism is typically used in work scenarios that require continuous or periodic rotation.

[0003] Some rotating mechanisms operate in harsh environments, such as water immersion and dusty environments. To prevent water leakage, a dynamic seal structure is installed between the rotating and stationary parts of the rotating mechanism. This structure can effectively prevent external dust, liquids, impurities, etc. from entering the motor. However, long-term operation of the motor, coupled with uncertain factors such as high temperature and high humidity, may cause the dynamic seal structure to fail.

[0004] Existing rotating mechanisms protect electrical components by wrapping the internal circuit board with insulating glue. While water or liquid impurities may not immediately cause failure of components such as steel plates and sensors inside the rotating mechanism, long-term operation in a humid environment can lead to rusting of components, measurement deviations of sensors, and short circuits in some rotating mechanisms that operate under high pressure. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art where liquid enters the rotating mechanism after the seal fails, causing malfunction.

[0006] To solve the above-mentioned technical problems, the present invention provides a dynamic seal detection device for a rotating mechanism, comprising:

[0007] Stator components;

[0008] A rotor assembly that rotates relative to the stator assembly, and a rotating shaft connected to a motor is attached to the rotor assembly;

[0009] An expansion member, in the shape of a ring, is disposed between the stator component and the rotor component;

[0010] Multiple position sensors are disposed between the stator component and the rotor component, and the detection end of each position sensor extends axially and contacts one axial end of the expansion component;

[0011] A dynamic sealing ring is disposed between the stator component and the rotor component and close to the expansion component;

[0012] The expansion component can absorb the liquid entering from the moving sealing ring side and expand to push the detection end of each position sensor.

[0013] In one embodiment of the present invention, a plurality of the position sensors are uniformly distributed along the circumference of the rotor component.

[0014] In one embodiment of the present invention, four position sensors are provided.

[0015] In one embodiment of the present invention, the expansion component is made of an expansion material that can expand after absorbing liquid.

[0016] In one embodiment of the present invention, the expansion component is made of a superabsorbent polymer, expandable rubber, expandable polyurethane foam, or fiber-based absorbent material.

[0017] The present invention also provides a method for detecting dynamic seals for rotating mechanisms, utilizing the aforementioned detection device for dynamic seals of rotating mechanisms, the method comprising:

[0018] The system includes a first calibration value, a second calibration value, a third calibration value, a fourth calibration value, and a fifth calibration value. The first calibration value and the second calibration value indicate the distance value of the position change of the detection end of the position sensor, and the second calibration value is greater than the first calibration value. The third calibration value, the fourth calibration value, and the fifth calibration value indicate the duration of different levels of fault alarms, and the fourth calibration value is greater than the third calibration value but less than the fifth calibration value.

[0019] In response to all the measured values ​​of the position sensors being less than or equal to the first calibration value, it is determined that no liquid has entered the rotating mechanism and the rotating mechanism is operating normally;

[0020] In response to any position sensor's measurement value being less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fifth calibration value, when all position sensor measurements are less than or equal to the first calibration value, the minor fault alarm disappears and the rotating mechanism operates normally; when any position sensor's measurement value is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm is retained, confirming that the liquid entering the rotating mechanism does not affect the normal operation of the rotating mechanism, at which point the rotating mechanism operates normally;

[0021] In response to the measurement values ​​of two or more of the position sensors being less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fourth calibration value, when the measurement value of any one of the position sensors is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm is retained and the rotating mechanism operates normally; in response to the measurement values ​​of any two or more of the position sensors being less than or equal to the second calibration value and greater than the first calibration value, a serious fault alarm is issued and the motor speed is limited to the first speed;

[0022] In response to the measurement value of any one or more of the position sensors being greater than the second calibration value, a serious fault alarm is issued, the motor speed is limited, and the clock starts counting down; in response to the clock counting duration being equal to the third calibration value, when the measurement value of one or more of the position sensors is less than or equal to the second calibration value and greater than the first calibration value, the serious fault alarm is retained, and the motor speed is limited to the second speed; when the measurement value of one or more of the position sensors is greater than the second calibration value, a particularly serious fault alarm is issued, the motor speed is limited to the third speed, and limp home mode is entered.

[0023] In one embodiment of the present invention, the first speed is 60% of the maximum speed of the motor.

[0024] In one embodiment of the present invention, the second speed is 50% of the maximum speed of the motor.

[0025] In one embodiment of the present invention, the third speed is 30% of the maximum speed of the motor.

[0026] The technical solution of the present invention has the following advantages compared with the prior art:

[0027] The present invention discloses a dynamic seal detection device and method for a rotating mechanism. When liquid enters due to seal failure, the expansion component rapidly absorbs and expands, causing a displacement change in the position sensor. The system issues an alarm signal and promptly handles the rotating mechanism, effectively preventing further liquid intrusion, thereby reducing damage to the rotating mechanism and significantly improving the safety and reliability of the equipment.

[0028] This invention incorporates intelligent control logic to differentiate and handle liquid intrusion situations of varying degrees. When a small amount of liquid is detected and disappears naturally within a set time, the system allows the rotating mechanism to continue operating normally without affecting the overall function of the equipment. However, when the liquid volume is large and cannot be eliminated within the set time, the system automatically limits the rotation speed of the mechanism to a preset speed (e.g., 30%, 50%, or 60% of the maximum speed) to prevent further mechanical damage. This tiered handling method not only improves the equipment's adaptability to harsh environments but also extends its service life and reduces maintenance costs.

[0029] The expansion component of this invention is installed after the dynamic sealing ring. Besides its detection function in case of liquid intrusion, the expansion material itself also possesses a certain liquid absorption capacity. When a small amount of liquid passes through the dynamic seal, the expansion material can quickly absorb it, further preventing the liquid from diffusing inwards. This design not only improves the overall sealing effect of the dynamic seal structure but also provides an additional protective layer in case of dynamic seal failure, effectively slowing down the rate of liquid erosion of the motor's internal components and ensuring stable operation of the motor even under minor leakage conditions. Attached Figure Description

[0030] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the dynamic seal detection device for the rotating mechanism of the present invention.

[0032] Figure 2 This is a schematic diagram of the distribution structure of the position sensor of the present invention. Figure 1 (AA section view).

[0033] Figure 3 This is a flowchart of the dynamic seal detection method for the rotating mechanism of the present invention.

[0034] Explanation of reference numerals in the instruction manual:

[0035] 1. Stator components;

[0036] 2. Rotor components;

[0037] 3. Dynamic sealing ring;

[0038] 4. Expansion components;

[0039] 5. Position sensor;

[0040] 6. Rotation axis. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0042] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0043] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0045] Example 1

[0046] Reference Figure 1 As shown, a dynamic seal detection device for a rotating mechanism according to the present invention includes:

[0047] Stator component 1;

[0048] Rotor component 2, which rotates relative to stator component 1, and a rotating shaft 6 connected to a motor is attached to rotor component 2;

[0049] An expansion member 4, which is annular in shape, is disposed between the stator member 1 and the rotor member 2;

[0050] Multiple position sensors 5 are disposed between the stator component 1 and the rotor component 2, and the detection end of each position sensor 5 extends axially and contacts one axial end of the expansion component 4.

[0051] The dynamic sealing ring 3 is disposed between the stator component 1 and the rotor component 2 and close to the expansion component 4; the main function of the dynamic sealing ring 3 is to prevent external liquids, dust, impurities, etc. from entering the motor during motor operation.

[0052] When the dynamic sealing ring 3 fails, the expansion component 4 can absorb the liquid entering from the side of the dynamic sealing ring 3 and expand to push the detection end of each of the position sensors 5.

[0053] It should be noted that during the operation of the rotating mechanism, if the dynamic seal structure fails, external liquid may enter the interior. Traditional methods struggle to detect such leaks in a timely manner, leading to prolonged liquid retention and potentially causing serious malfunctions such as short circuits, component corrosion, or sensor malfunction. By installing an expansion component 4 and multiple position sensors 5 between the stator and rotor, liquid ingress can be detected immediately. When liquid enters due to a seal failure, the expansion component 4 rapidly absorbs and expands, causing a displacement change in the position sensors 5. The system then issues an alarm signal and promptly addresses the rotating mechanism, effectively preventing further liquid intrusion and reducing damage to the rotating mechanism, significantly improving the safety and reliability of the equipment.

[0054] Furthermore, the expansion component 4 is installed after the dynamic sealing ring 3. Besides its detection function in case of liquid intrusion, the expansion material itself also possesses a certain liquid absorption capacity. When a small amount of liquid passes through the dynamic seal, the expansion material can quickly absorb it, further preventing the liquid from spreading inwards. This design not only improves the overall sealing effect of the dynamic seal structure but also provides an additional protective layer in case of dynamic seal failure, effectively slowing down the rate of liquid erosion of the motor's internal components and ensuring stable operation of the motor even under minor leakage conditions.

[0055] Reference Figure 2 As shown, multiple position sensors 5 are evenly distributed around the rotor component 2 and located on the same circle.

[0056] By evenly distributing position sensors 5 at multiple key locations along the rotating mechanism, preferably four at 90° intervals, this multi-point detection method ensures that the expansion component 4 can be detected promptly when liquid seeps in from multiple directions, greatly improving the comprehensiveness and accuracy of the detection. Compared to a single-point sensor layout, the multi-sensor system can more effectively identify the specific location and extent of liquid intrusion, improving processing precision.

[0057] Specifically, the expansion component 4 is made of an expansion material that can expand after absorbing liquid.

[0058] The expansion component 4 is made of highly absorbent polymers, expandable rubber, expandable polyurethane foam, or fiber-based absorbent materials, all of which have excellent liquid absorption and expansion properties and environmental adaptability. These materials can work stably under different operating conditions, such as high temperature, high humidity, water immersion, or dusty environments, ensuring that the system can effectively detect liquid intrusion in a variety of complex environments.

[0059] During operation, the expansion component 4 absorbs the liquid entering the rotating mechanism and undergoes physical expansion due to liquid absorption, thereby triggering the position sensor 5 to detect and alarm. When the rotating mechanism operates in harsh environments, the main function of the dynamic sealing ring 3 is to prevent external liquids, dust, and other impurities from entering the motor. However, due to prolonged operation, high temperature, and high humidity, the dynamic sealing structure may fail, causing liquid to seep into the rotating mechanism. When liquid enters the rotating mechanism through the failed dynamic sealing ring 3, the expansion component 4, located between the stator component 1 and the rotor component 2, quickly absorbs this liquid. After absorbing the liquid, the volume of the expansion material increases significantly, causing the expansion component 4 to physically expand. This expansion pushes the relative displacement between the contact end of the expansion component 4 and the position sensor 5. Since both the expansion component 4 and the dynamic sealing ring 3 are annular structures, the expansion mainly occurs axially, ensuring the movement of the position sensor 5. The positional change caused by the expansion of the expansion component 4 is detected by multiple position sensors 5 (usually four, at 90° angles to each other) pre-arranged around the rotating mechanism. The detection end of the position sensor 5 is in axial contact with the expansion component 4. When expansion occurs, the detection end of the sensor will undergo displacement change. These displacement changes are converted into electrical signals by the sensor and transmitted to the control system for processing.

[0060] Example 2

[0061] Reference Figure 3 As shown, this embodiment provides a method for detecting dynamic seals in rotating mechanisms, utilizing the dynamic seal detection device for rotating mechanisms described in Embodiment 1. The method includes:

[0062] A first calibration value, a second calibration value, a third calibration value, a fourth calibration value, and a fifth calibration value are preset; wherein, the first calibration value and the second calibration value indicate the distance value of the position change of the detection end of the position sensor 5, and the second calibration value is greater than the first calibration value; the third calibration value, the fourth calibration value, and the fifth calibration value indicate the duration of issuing different levels of fault alarms, and the fourth calibration value is greater than the third calibration value but less than the fifth calibration value; after the rotating mechanism is powered on:

[0063] Condition 1: In response to the fact that the measured values ​​of all the position sensors 5 (four in this embodiment) are less than or equal to the first calibration value, it is determined that no liquid has entered the rotating mechanism and the rotating mechanism is operating normally;

[0064] Operating Condition 2: In response to any position sensor 5's measured value being less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fifth calibration value, when all position sensor 5's measured values ​​are less than or equal to the first calibration value, the minor fault alarm disappears and the rotating mechanism operates normally; when any position sensor 5's measured value is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm remains, at which point the amount of liquid entering the rotating mechanism is extremely small, confirming that the liquid entering the rotating mechanism does not affect the normal operation of the rotating mechanism, and the rotating mechanism operates normally at this time;

[0065] Operating Condition 3: In response to two or more position sensors 5 measuring values ​​less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fourth calibration value, when any one of the position sensors 5 measuring values ​​is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm is retained, and the rotating mechanism operates normally; in response to any two or more position sensors 5 measuring values ​​less than or equal to the second calibration value and greater than the first calibration value, a serious fault alarm is issued, and the motor speed is limited to a first speed; the first speed is 60% of the motor's maximum speed. At this time, it is recommended to inspect the dynamic sealing components of the rotating mechanism and drain any small amount of liquid from inside the motor.

[0066] Operating Condition 4: In response to the measurement value of any one or more of the position sensors 5 being greater than the second calibration value, a serious fault alarm is issued, the motor speed is limited, and the clock starts timing; in response to the clock timing duration being equal to the third calibration value, when the measurement value of one or more of the position sensors 5 is less than or equal to the second calibration value and greater than the first calibration value, the serious fault alarm is retained, and the motor speed is limited to the second speed; the second speed is 50% of the motor's maximum speed;

[0067] When the measured value of one or more of the position sensors 5 is greater than the second calibration value, it is considered that a large amount of liquid has entered the rotating mechanism and needs to be dealt with in time. A particularly serious fault alarm is issued, the motor speed is limited to the third speed and enters the limp home mode. The third speed is 30% of the maximum speed of the motor.

[0068] In this embodiment, position sensor 5 is connected to the control system, which employs a programmable logic controller (PLC) or a microcontroller unit (MCU). Fault alarm methods include buzzers, horns, LED indicators, and flashing lights. Clock timing utilizes software programs within the control system to implement timing functions, controlling time intervals through counters or delay functions, or employing hardware timers / timer modules.

[0069] For example, when the control system detects a serious fault, it emits a continuous beeping sound to prompt the operator to check. Different colored LED indicators (e.g., red for a serious fault, yellow for a minor fault) display the current system status.

[0070] Using the above method, if liquid enters the rotating mechanism after the dynamic sealing ring 3 fails, the system can quickly detect the presence of liquid and trigger an alarm, minimizing the damage caused by liquid intrusion. This prevents liquid from remaining inside the rotating mechanism for an extended period, which could lead to continued operation and ultimately cause a short circuit or complete failure of the rotating mechanism. The system achieves liquid intrusion detection and comprehensively ensures the operational safety of the rotating mechanism through a systematic alarm mechanism and speed limiting strategy. Based on the degree and duration of liquid intrusion, the system can automatically adjust the motor speed, even entering a limp-home mode in extreme cases, ensuring that the equipment maintains basic functions even in the event of a serious fault, preventing further losses due to the escalation of the fault. This intelligent fault response not only improves equipment reliability but also simplifies maintenance procedures and reduces the risk of downtime and economic losses caused by equipment failure.

[0071] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for detecting dynamic seals in a rotating mechanism, characterized in that, The rotating mechanism dynamic seal testing device includes: Stator component (1); Rotor component (2), which rotates relative to the stator component (1), and a rotating shaft (6) connected to the motor is attached to the rotor component (2). An expansion component (4) is annular and disposed between the stator component (1) and the rotor component (2); Multiple position sensors (5) are disposed between the stator component (1) and the rotor component (2), and the detection end of each position sensor (5) extends axially and contacts one axial end of the expansion component (4). A dynamic sealing ring (3) is disposed between the stator component (1) and the rotor component (2) and close to the expansion component (4). The expansion component (4) is capable of absorbing the liquid entering from the side of the moving sealing ring (3) and expanding to push the detection end of each of the position sensors (5); The method includes: The system presets a first calibration value, a second calibration value, a third calibration value, a fourth calibration value, and a fifth calibration value; wherein, the first calibration value and the second calibration value indicate the distance value of the position change of the detection end of the position sensor (5), and the second calibration value is greater than the first calibration value; the third calibration value, the fourth calibration value, and the fifth calibration value indicate the duration of issuing different levels of fault alarms, and the fourth calibration value is greater than the third calibration value but less than the fifth calibration value; In response to the fact that the measured values ​​of all the position sensors (5) are less than or equal to the first calibration value, it is determined that no liquid has entered the interior of the rotating mechanism and the rotating mechanism is operating normally; In response to the measurement value of any one of the position sensors (5) being less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fifth calibration value, when the measurement values ​​of all the position sensors (5) are less than or equal to the first calibration value, the minor fault alarm disappears and the rotating mechanism operates normally; when the measurement value of any one of the position sensors (5) is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm is retained, confirming that the liquid entering the rotating mechanism does not affect the normal operation of the rotating mechanism, and at this time the rotating mechanism operates normally; In response to the measurement values ​​of two or more of the position sensors (5) being less than or equal to the second calibration value and greater than the first calibration value, a minor fault alarm is issued and the clock starts timing; in response to the clock timing duration being equal to the fourth calibration value, when the measurement value of any one of the position sensors (5) is less than or equal to the second calibration value and greater than the first calibration value, the minor fault alarm is retained and the rotating mechanism operates normally; in response to the measurement values ​​of any two or more of the position sensors (5) being less than or equal to the second calibration value and greater than the first calibration value, a serious fault alarm is issued and the motor speed is limited to the first speed; In response to the measurement value of any one or more of the position sensors (5) being greater than the second calibration value, a serious fault alarm is issued, the motor speed is limited, and the clock starts counting; in response to the clock counting duration being equal to the third calibration value, when the measurement value of one or more of the position sensors (5) is less than or equal to the second calibration value and greater than the first calibration value, the serious fault alarm is retained, and the motor speed is limited to the second speed; when the measurement value of one or more of the position sensors (5) is greater than the second calibration value, a particularly serious fault alarm is issued, the motor speed is limited to the third speed, and limp home mode is entered.

2. The method for detecting a dynamic seal in a rotating mechanism according to claim 1, characterized in that, Multiple position sensors (5) are evenly distributed circumferentially along the rotor component (2).

3. The method for detecting dynamic seals in a rotating mechanism according to claim 2, characterized in that, The position sensor (5) is provided in four parts.

4. The method for detecting a dynamic seal in a rotating mechanism according to claim 1, characterized in that, The expansion component (4) is made of an expansion material that can expand after absorbing liquid.

5. The method for detecting a dynamic seal in a rotating mechanism according to claim 4, characterized in that, The expansion component (4) is made of highly absorbent polymer, expandable rubber, expandable polyurethane foam or fiber-based absorbent material.

6. The method for detecting a dynamic seal in a rotating mechanism according to claim 1, characterized in that, The first speed is 60% of the maximum speed of the motor.

7. The method for detecting a dynamic seal in a rotating mechanism according to claim 1, characterized in that, The second speed is 50% of the motor's maximum speed.

8. The method for detecting a dynamic seal in a rotating mechanism according to claim 1, characterized in that, The third speed is 30% of the motor's maximum speed.

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