Submersible motor with underwater monitoring function

Abstract

The utility model provides a submersible motor with an underwater monitoring function. The submersible motor comprises a motor main body, and a liquid leakage protection probe, a temperature sensor and a vibration sensor which are arranged in the motor main body, the liquid leakage protection probe monitors the state of a motor oil chamber, the temperature sensor monitors the temperature rise condition of a stator winding, and the vibration sensor monitors the vibration condition of a motor bearing; the vibration sensor comprises a measurement coordinate system, and the measurement coordinate system comprises 1-3 coordinate axis systems; the working state of the motor can be directly reflected by monitoring the leakage protection level, the winding temperature and the state of the motor bearing, whether the motor is abnormal or not is effectively monitored, the motor can be shut down in time when the abnormality occurs, internal parts of the motor are protected against damage, and the operation and maintenance cost of the motor is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency permanent magnet submersible motors, in particular to a submersible motor with underwater monitoring. Background Art

[0002] Variable frequency permanent magnet submersible motors are widely used in municipal sewage treatment systems. They are usually placed in an underwater environment 5 meters below the water surface. Due to the particularity of the underwater environment, traditional motor monitoring methods are difficult to effectively sense the working status of the motor, resulting in untimely fault detection. Often, the staff can only detect the problem after the motor stops or burns out. In this case, the motor has often suffered serious damage, which not only has high maintenance costs, but may also affect the normal operation of the entire sewage treatment system. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art, improve the reliability of the motor and reduce the maintenance cost. The utility model provides a submersible motor with underwater monitoring, which realizes real-time monitoring of the working state of the motor, so as to timely discover and deal with potential faults and avoid serious damage.

[0004] In order to solve the above technical problems, the utility model provides a submersible motor with underwater monitoring, including a motor body and a leakage protection probe, a temperature sensor and a vibration sensor arranged in the motor body;

[0005] The leakage protection probe monitors the state of the motor oil chamber, the temperature sensor monitors the temperature rise of the stator winding, and the vibration sensor monitors the vibration of the motor bearing;

[0006] The vibration sensor includes a measurement coordinate system setting, and the measurement coordinate system is a 1-3 coordinate axis system.

[0007] In a preferred embodiment, the temperature sensor is arranged at the center point of the star connection of the motor winding.

[0008] In a preferred embodiment, the output of the temperature sensor is set to an analog quantity or a switch quantity.

[0009] In a preferred embodiment, the leakage protection probe is fixed on a front flange inside the motor, and the front flange is arranged on the rear side of the motor oil chamber;

[0010] The probe of the liquid leakage protection probe extends into and is placed in the motor oil chamber.

[0011] In a preferred embodiment, the leakage protection probe is arranged at a low position of the motor oil chamber, and the probe is arranged at a certain height.

[0012] In a preferred embodiment, the output of the leakage protection probe is set as a switch value.

[0013] In a preferred embodiment, the leakage protection probe is fixed to the front flange through fine threads and an O-ring.

[0014] In a preferred embodiment, a deep groove ball bearing is provided at the floating end of the motor, and the vibration sensor measures the vibration amount of the deep groove ball bearing.

[0015] In a preferred embodiment, the output of the vibration sensor is an analog quantity, and the analog quantity is a velocity quantity or an acceleration quantity.

[0016] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0017] 1. Install a leakage protection probe: Install a leakage protection probe on the front flange of the motor. The probe can monitor the status of the motor oil chamber in real time and issue an alarm immediately if water enters. This can not only prevent the motor from being damaged by water ingress, but also remind the staff to deal with it in time.

[0018] 2. Set up temperature sensors: Install temperature sensors on the motor windings to monitor the temperature rise of the stator windings. When the motor is operating normally, the temperature of the stator windings will remain in a relatively stable range. Once the temperature exceeds the preset safety threshold, the sensor will immediately issue a warning, prompting the staff to check the motor's cooling system or load conditions.

[0019] 3. Install vibration sensors: Install vibration sensors at the motor bearings to monitor the vibration of the motor bearings. The bearings are one of the parts of the motor that are most prone to problems. Vibration sensors can detect abnormal vibrations of the bearings in time and prevent motor failures caused by bearing damage.

[0020] 4. Comprehensive monitoring system: By integrating the data of leakage protection probe, temperature sensor and vibration sensor into a monitoring system, the working status of the motor can be fully reflected. The system can display the leakage protection level, winding temperature and bearing vibration status of the motor in real time, providing intuitive and accurate motor operation information for the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an internal cross-sectional view of the submersible motor in the preferred embodiment of the utility model;

[0022] Figure 2 It is a front view of the submersible motor in the preferred embodiment of the utility model.

[0023] Explanation of the accompanying drawings: 1. Motor body; 2. Leakage protection probe; 3. Temperature sensor; 4. Vibration sensor; 5. Motor oil chamber; 6. First front flange; 7. Deep groove ball bearing; 8. First mechanical seal; 9. Second mechanical seal; 10. Second front flange; 11. Rear flange; 12. Casing. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0027] refer to Figure 1-Figure 2 This embodiment provides a submersible motor with underwater monitoring, which aims to solve the problem that it is difficult or impossible to monitor the working status of the motor when the motor is working underwater. The submersible motor has underwater real-time monitoring, which can implement protection actions in time before the motor is about to become abnormal, avoid particularly serious failures of the motor, and reduce the operation and maintenance costs of the motor.

[0028] The submersible motor provided in this embodiment is provided with a leakage protection probe 2, a temperature sensor 3 and a vibration sensor 4 in the motor body. The leakage protection probe 2 can monitor the state of the motor oil chamber 5 and observe whether water enters the motor oil chamber 5. The temperature rise of the stator winding can be monitored by installing a temperature sensor 3 on the stator core of the motor, and the vibration of the motor bearing can be monitored by installing a vibration sensor 4 on the rear flange 11 of the motor. By monitoring the leakage protection level, the winding temperature, and the state of the motor bearing, the working state of the motor can be directly reflected, and the motor can be effectively monitored to see if there is any abnormality. When an abnormality occurs, the motor can be shut down in time to protect the internal components of the motor from damage, thereby greatly reducing the operation and maintenance cost of the motor.

[0029] The submersible electric machine structure is as follows: the motor body 1 includes a motor main shaft, a motor oil chamber 5 arranged at the front end of the motor main shaft 1, a second front flange 10 and a second front flange 10 are installed on the front and rear sides of the motor oil chamber 5, and a first mechanical seal 8 and a second mechanical seal 9 are arranged on the front end of the motor main shaft. The middle part of the motor main shaft 1 is a motor winding, including a stator core. The rear end of the motor main shaft is the floating end of the motor, and the floating end has a large vibration relative to the fixed end of the motor main shaft 1. A deep groove ball bearing 7 is arranged at the rear end of the motor main shaft, and a rear flange 11 is added to the deep groove ball bearing 7.

[0030] In the temperature monitoring system of the motor, the placement of the temperature sensor 3 is crucial to ensure accurate monitoring of the temperature of the motor winding. In this embodiment, the temperature sensor 3 is placed at the neutral point of the star connection of the motor winding. The star connection neutral point of the motor winding is the area most sensitive to temperature changes in the motor winding and can provide the most accurate temperature reading. The temperature sensor 3 monitors the temperature of the motor winding in real time to ensure that the motor runs within a safe temperature range and avoids damage caused by overheating.

[0031] The temperature sensor 3 is capable of outputting two types of signals, analog and switch. Analog output: provides continuous temperature readings, allowing for more sophisticated temperature control and monitoring, suitable for systems that require precise temperature regulation. Switch output: provides a switch signal when the temperature reaches a preset threshold, triggering an alarm or automatic control system, such as starting a cooling system or shutting down a motor.

[0032] In the design of the motor, it is very important to ensure the effectiveness of its oil chamber and sealing system to prevent liquid leakage and damage to the motor. The oil chamber is a sealed space inside the motor for storing oil for lubrication and cooling. In this embodiment, a leakage protection probe 2 is selected to be set in the motor oil chamber 5 to detect whether there is liquid leakage into the oil chamber.

[0033] The specific position is set as follows: the leakage protection probe 2 is fixed to the first front flange 6 at the rear side of the motor oil chamber 5 through fine pitch threads and O-rings, and the probe of the leakage protection probe 2 is extended into and placed in the motor oil chamber 5 to ensure its sealing and stability. The probe of the leakage protection probe 2 is set at a low position in the motor oil chamber 5, and the probe has a certain height setting, and when the motor oil chamber 5 leaks to a certain height, the motor alarms.

[0034] The output of the liquid leakage protection probe 2 is set as a switch quantity. When liquid leakage is detected and reaches a certain amount, the probe triggers a short circuit, causing the motor to alarm and display abnormal operation.

[0035] The mechanical seal arranged on the front end of the motor main shaft is a key sealing component of the motor, which prevents liquid from entering the interior of the motor. When the first mechanical seal 8 fails or the O-ring or sealant between the second front flange 10 and the end face of the casing 12 fails, external liquid may enter the motor oil chamber 5. When the liquid entering reaches a certain amount, the probe of the leakage protection probe 2 is short-circuited, and the motor alarm sounds, indicating abnormal operation. At this time, the second mechanical seal 9 is still in normal state, and the key components of the internal stator and rotor core of the motor will not be damaged, and the motor will not be seriously damaged.

[0036] Once leakage is found, the motor needs to be lifted out of the water and the sealing rings between the first mechanical seal 8 and the second front flange 10 and the housing 12 need to be replaced. Sealant is reapplied to the end faces of the first mechanical seal 8 and the second front flange 10 to complete the repair.

[0037] In the motor status monitoring system, the vibration sensor 4 is used to evaluate the running status of the motor and the health status of the bearing. In this embodiment, a deep groove ball bearing 7 is arranged at the rear end of the motor main shaft, and a rear flange 11 is added to the deep groove ball bearing 7. The deep groove ball bearing 7 serves as the floating end of the motor, and the vibration sensor 4 is installed at the rear flange 11 to monitor the vibration of the deep groove ball bearing 7.

[0038] The deep groove ball bearing 7 is the floating end bearing of the motor. Compared with the fixed end, the vibration of the floating end bearing is usually greater, so it becomes the focus of monitoring. By measuring the vibration of the floating end deep groove ball bearing 7, the operating status of the motor can be more accurately evaluated. This monitoring method allows us to focus on key areas that may cause failures.

[0039] The output of the vibration sensor 4 can be a velocity or acceleration measurement, both of which are analog signals, which provides flexibility for accurate monitoring of the motor state. The measurement coordinate system of the vibration sensor 4 can select 1-3 coordinate axis systems according to the installation method and standard. This flexibility enables the sensor to be optimally configured according to specific monitoring requirements and installation conditions.

[0040] The measurement results of the vibration sensor 4 can intuitively display the changes in the motor's working state under water and the health status of the bearings. This is crucial for timely detection and prevention of potential failures. Through continuous monitoring by the vibration sensor 4, maintenance can be carried out in time before an abnormality occurs, thereby avoiding serious damage to the motor and reducing downtime and maintenance costs.

[0041] In this embodiment, by installing a temperature sensor 3 at a key position of the motor body 1, the safety of the motor operation is significantly improved, and the risk of failure caused by abnormal temperature is reduced. By setting a leakage protection probe 2 in the motor oil chamber 5, the motor can alarm in time when a leak occurs, avoiding further damage, while simplifying the maintenance process and ensuring the reliability and safety of the motor. By using a vibration sensor 4 with analog output, continuous and accurate vibration data can be provided, which is helpful for in-depth data analysis and fault diagnosis. The data of the vibration sensor 4 can be integrated with the data of other monitoring systems (such as temperature sensors 3, leakage protection probes 2, etc.) to form a comprehensive motor health monitoring network, which can directly reflect the working status of the motor, effectively monitor whether the motor has abnormalities, and can shut down the motor in time when an abnormality occurs to protect the internal components of the motor from damage, greatly reducing the operation and maintenance cost of the motor.

[0042] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A submersible motor with underwater monitoring, characterized in that: It includes a motor body and a liquid leakage protection probe, a temperature sensor and a vibration sensor arranged in the motor body; The leakage protection probe monitors the state of the motor oil chamber, the temperature sensor monitors the temperature rise of the stator winding, and the vibration sensor monitors the vibration of the motor bearing; The vibration sensor includes a measurement coordinate system setting, and the measurement coordinate system is a 1-3 coordinate axis system.

2. A submersible motor with underwater monitoring according to claim 1, characterized in that: The temperature sensor is arranged at the center point of the star connection of the motor winding.

3. A submersible motor with underwater monitoring according to claim 2, characterized in that: The output of the temperature sensor is set to be an analog quantity or a switch quantity.

4. A submersible motor with underwater monitoring according to claim 1, characterized in that: The leakage protection probe is fixed on the front flange inside the motor, and the front flange is arranged on the rear side of the motor oil chamber; The probe of the liquid leakage protection probe extends into and is placed in the motor oil chamber.

5. A submersible motor with underwater monitoring according to claim 4, characterized in that: The probe of the leakage protection probe is arranged at a low position of the motor oil chamber, and the probe is arranged at a certain height.

6. A submersible motor with underwater monitoring according to claim 5, characterized in that: The output of the leakage protection probe is set as a switch quantity.

7. A submersible motor with underwater monitoring according to claim 3, characterized in that: The liquid leakage protection probe is fixed on the front flange through fine thread and O-ring.

8. The submersible motor with underwater monitoring according to claim 1, characterized in that: A deep groove ball bearing is arranged at the floating end of the motor, and the vibration sensor measures the vibration amount of the deep groove ball bearing.

9. A submersible motor with underwater monitoring according to claim 8, characterized in that: The output quantity of the vibration sensor is an analog quantity, which is a velocity quantity or an acceleration quantity.

Images