An online monitoring system for underwater equipment of a waterproof structure

Abstract

An online monitoring system for underwater equipment with a waterproof structure relates to the technical field of power equipment operation status monitoring systems for seawater environments. It addresses the technical deficiency of submersible pump online monitoring systems in seawater environments, which lack reliable waterproofing. The system includes a temperature sensor installed inside the submersible pump to monitor the temperature of the coolant and / or windings within the motor cavity; a triaxial vibration temperature sensor installed on the outer wall of the submersible pump; and a pressure sensor to monitor the medium pressure. A stainless steel waterproof connector for the temperature probe is installed on the motor housing of the submersible pump. The lead wire of the temperature sensor is led out of the motor housing through the waterproof connector. A rubber clamping sealing assembly is installed inside the waterproof connector. One end of the waterproof connector is threadedly sealed to an opening on the motor housing, while the other end has an external thread and is connected to a first stainless steel branch line through an internal threaded fitting. The leads of the temperature sensor, triaxial vibration temperature sensor, and pressure sensor are all led out through the main stainless steel line. The waterproof protective layer has overall strength capable of withstanding certain external impacts and preventing damage caused by marine organism aggregation. It is easy and quick to assemble and disassemble, and is waterproof, stable, and reliable, achieving properties that ordinary monitoring components cannot use in seawater.

Description

Technical Field

[0001] This invention relates to the technical field of power equipment operation status monitoring systems for seawater environments, and particularly to the waterproof structure of submersible pump operation status monitoring systems. Background Technology

[0002] With the rise of Industrial Internet of Things (IIoT) technology, many industrial and mining enterprises are upgrading their large power equipment for online monitoring to achieve real-time monitoring, fault diagnosis, and anomaly warning, replacing the original manual inspections and achieving the goal of preventing problems before they occur. High-power submersible pumps are key equipment on offshore oil production platforms. Upgrading them for online monitoring is beneficial for real-time control of equipment operating conditions and can avoid economic losses caused by a series of shutdowns due to unexpected equipment failures. Depending on the function, the monitoring system can be divided into six parts: data acquisition, signal transmission, data storage and analysis, fault diagnosis and early warning, monitoring result display, and result sharing.

[0003] Existing temperature sensors, triaxial vibration temperature sensors, pressure sensors, displacement sensors, and cable connectors for monitoring the operating status of power equipment are generally designed for land-based applications and cannot be directly applied to power equipment used below the sea surface, thus failing to reliably guarantee insulation. The applicant has attempted to modify the various sampling components to meet the IP68 waterproof rating, but it still cannot achieve inherent waterproofing. Any water seepage in the system will cause monitoring malfunctions. Therefore, it is impossible to find a reliable waterproof solution for online monitoring of submersible pumps in a seawater environment that is directly applicable from existing industrial products. Summary of the Invention

[0004] In summary, the purpose of this invention is to address the technical shortcomings of online monitoring systems for submersible pumps in seawater environments, which lack reliable waterproofing, and to propose an online monitoring system for underwater equipment with a waterproof structure.

[0005] To solve the technical problem proposed in this invention, the technical solution adopted is as follows:

[0006] A waterproof underwater equipment online monitoring system includes a temperature sensor installed inside a submersible pump for monitoring the temperature of the coolant and / or windings in the motor cavity, a triaxial vibration temperature sensor installed on the outer wall of the submersible pump, and a pressure sensor for monitoring the medium pressure. The system is characterized by: a stainless steel waterproof temperature probe connector on the motor housing of the submersible pump; the lead wire of the temperature sensor is led out of the motor housing through the waterproof temperature probe connector; a rubber clamping sealing assembly is provided inside the waterproof temperature probe connector; one end of the waterproof temperature probe connector is threadedly sealed to an opening on the motor housing; the other end has an external thread and is connected to a first stainless steel branch line through an internal threaded fitting; the triaxial vibration temperature sensor is fixedly installed and connected to the outer wall of the submersible pump through a stainless steel triaxial vibration temperature sensor unit conversion connector; the inner wall of the front end of the triaxial vibration temperature sensor unit conversion connector connected to the outer wall of the submersible pump is matched with the male thread of the triaxial vibration temperature sensor through a female thread; the triaxial... The lead wire of the temperature sensor is led out from the tail end of the triaxial temperature sensor unit adapter and sealed with sealant to the inner wall of the triaxial temperature sensor unit adapter. The tail end of the triaxial temperature sensor unit adapter has an external thread and is connected to a second stainless steel branch line through an internal threaded ferrule. The pressure sensor is installed at the opening of the submersible pump's delivery pipe through the pressure sensor unit connector. The pressure sensor unit connector includes a base with an internal thread for screwing the pressure sensor in and fixing it. A stainless steel circular pipe section is also connected to the base. The tail end of the circular pipe section has an end cap. The lead wire of the pressure sensor is led out through the circular pipe section and the end cap. A third stainless steel branch line is connected to the end cap through an internal threaded ferrule. The first, second, and third stainless steel branch lines are respectively connected to the stainless steel main line. The leads of the temperature sensor, triaxial temperature sensor, and pressure sensor are all led out through the stainless steel main line.

[0007] The technical solutions that further define the present invention include:

[0008] The temperature sensors include a coolant temperature sensor and a winding temperature sensor; the coolant temperature sensor is inserted into the coolant through an opening in the housing of the thrust bearing of the motor; the winding temperature sensor extends into the motor cavity through a through hole with a countersunk hole in the upper cover of the motor and is fixed to the winding.

[0009] The triaxial vibration and temperature sensor includes a first MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the motor, a second MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the pump, and a third MEMS triaxial vibration and temperature composite sensor for monitoring the axial, longitudinal, and transverse vibration and temperature at the bearing. The first MEMS triaxial vibration and temperature composite sensor is installed in a countersunk hole in the motor cover via a triaxial vibration and temperature sensor unit adapter. The second MEMS triaxial vibration and temperature composite sensor is glued to the pump housing at the position corresponding to the sliding bearing using metal adhesive. The third MEMS triaxial vibration and temperature composite sensor is installed on the outside of the housing at the bearing location.

[0010] The pressure sensor includes a first pressure sensor located at the pump outlet of the water delivery pipe, a second pressure sensor located at the wellhead of the water delivery pipe, and a third pressure sensor located at the bend of the water delivery pipe at the wellhead.

[0011] The rubber clamping and sealing assembly in the inner cavity of the waterproof temperature probe connector includes a rubber sealing layer sleeved on the lead wire of the temperature sensor, an inner clamping nut, and an outer clamping nut; the inner clamping nut and the outer clamping nut are located on the inner and outer sides of the rubber sealing layer, respectively, and are threadedly connected to the inner cavity wall of the waterproof temperature probe connector, squeezing the rubber sealing layer to seal the inner cavity channel of the waterproof temperature probe connector; the inner and outer ends of the inner cavity of the waterproof temperature probe connector are also filled with waterproof silicone.

[0012] The first stainless steel branch line is connected in series with a stainless steel temperature signal converter unit connector via a compression fitting; the temperature signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the temperature signal output by the temperature sensor.

[0013] It also includes a displacement sensor that monitors the axis trajectory of the pump shaft at the connection between the motor and the pump; the displacement sensor is connected to a displacement sensor unit conversion connector via an external thread, and the other end of the displacement sensor unit conversion connector is connected to a fourth stainless steel branch line via an internal threaded ferrule connector; the fourth stainless steel branch line is connected to the stainless steel main line; the lead wire of the displacement sensor is introduced into the stainless steel main line through the displacement sensor unit conversion connector and the fourth stainless steel branch line.

[0014] The fourth stainless steel branch line is connected in series with a stainless steel displacement sensor signal converter unit connector via a compression fitting; the displacement sensor signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the displacement signal output by the displacement sensor.

[0015] The temperature sensor, triaxial vibration temperature sensor, pressure sensor, and displacement sensor all have quick-connect plugs on their leads.

[0016] The first, second, third, and fourth stainless steel branch lines, the waterproof connector for the temperature probe, the conversion connector for the triaxial vibration temperature sensor unit, the connector for the pressure sensor unit, and the conversion connector for the displacement sensor unit are all made of SS316 stainless steel. The first, second, third, and fourth stainless steel branch lines are each sealed to the main SS316 stainless steel line via SS316 stainless steel tee connectors. The upper end of the main stainless steel line is sealed to an instrument cable connector, which is connected to the lead wires of the temperature sensor, the triaxial vibration temperature sensor, the pressure sensor, and the displacement sensor for electrical signal connection.

[0017] The advantages of this invention are as follows: This invention adds multiple sensors inside and outside the submersible pump to monitor its operating status. Each sensor is connected to a stainless steel branch line via a corresponding adapter. Each stainless steel branch line is then connected to a stainless steel main line. The leads of each sensor are sealed and isolated at the corresponding adapter, stainless steel branch line, and stainless steel main line, forming a waterproof protective layer. The overall strength can withstand certain external impacts and prevent damage caused by marine organism aggregation. Each sensor unit can be disassembled and replaced individually. During submersible pump overhauls, the monitoring system can be disassembled section by section, and after the overhaul, the monitoring system can be quickly restored. Disassembly and assembly are convenient and quick, waterproof, stable, and reliable, achieving properties that ordinary monitoring components cannot be applied to seawater. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 A schematic diagram of the main structure of this invention;

[0020] Figure 3 This is an exploded structural diagram of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the waterproof connector for the temperature probe of the present invention;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the waterproof connector for the temperature probe of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the temperature signal converter unit connector of the present invention;

[0024] Figure 7 This is a three-dimensional structural schematic diagram of the conversion connector for the triaxial vibration temperature sensor unit of the present invention;

[0025] Figure 8This is a schematic cross-sectional view of the conversion connector for the triaxial vibration temperature sensor unit of the present invention;

[0026] Figure 9 This is a three-dimensional structural schematic diagram of the displacement sensor unit conversion connector of the present invention;

[0027] Figure 10 This is a schematic cross-sectional view of the displacement sensor unit conversion connector of the present invention. Detailed Implementation

[0028] The structure of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0029] Reference Figures 1 to 10 As shown, the underwater equipment online monitoring system with a waterproof structure disclosed in this invention includes a temperature sensor, a triaxial vibration temperature sensor, and a pressure sensor; depending on the monitoring needs, it may also include a displacement sensor.

[0030] In practical implementation, only one temperature sensor can be used to monitor the temperature of the coolant or windings inside the motor cavity 2; alternatively, a... Figure 2 As shown, two temperature sensors are used to monitor the coolant temperature and winding temperature inside the motor cavity 2, respectively. That is, the temperature sensors include a coolant temperature sensor 11 and a winding temperature sensor 12. The coolant temperature sensor 11 is inserted into the coolant through an opening in the outer shell of the motor's thrust bearing. The winding temperature sensor 12 extends into the motor cavity through a through hole with a countersunk hole in the upper cover of the motor and is fixed to the winding. More temperature sensors can also be installed at more locations in the motor cavity 2 as needed to achieve multi-point temperature monitoring.

[0031] To prevent the opening through which the temperature sensor lead wires exit the motor housing 2 from affecting the waterproofing of the motor housing 2, and to prevent coolant leakage from the thrust bearing within the motor housing 2, the submersible pump's motor housing is equipped with a stainless steel waterproof temperature probe connector 3. The temperature sensor lead wires exit the motor housing via the waterproof temperature probe connector 3. When the temperature sensor includes a coolant temperature sensor 11 and a winding temperature sensor 12, both temperature sensors are led out of the motor housing using a waterproof temperature probe connector 3 with the same structure. The waterproof temperature probe connector has a rubber clamping sealing assembly inside. One end of the waterproof temperature probe connector is threadedly sealed to the opening on the motor housing, and the other end has an external thread, which is connected to the first stainless steel branch line 111 via an internal threaded compression fitting.

[0032] Furthermore, the waterproof connector 3 for the temperature probe is made of SS316 stainless steel. One end is a 1 / 2” NPT interface 31 that connects to an opening on the motor housing. The 1 / 2” NPT interface consists of a section of sealing cylindrical pipe thread and a section of sealing tapered pipe thread. The other end is a 3 / 4” pipe diameter interface 32, which connects to the first stainless steel branch line 111 via a 3 / 4” SS316 stainless steel compression fitting structure. The compression fitting structure is a sealed and fixed structure consisting of a front compression fitting, a rear compression fitting, and a compression fitting nut. The temperature sensor is effectively isolated from seawater by the sealed and isolated design of the waterproof connector 3 and the first stainless steel branch line 111.

[0033] To better ensure that the temperature sensor can pass through the waterproof connector 3 of the temperature probe, and to prevent the coolant in the thrust bearing area inside the motor cavity 2 from entering the first stainless steel branch pipe 111 through the waterproof connector 3, or to prevent seawater from entering the motor cavity 2 through the waterproof connector 3 in the event of a leak in the first stainless steel branch pipe 111, such as... Figure 4 and Figure 5 As shown, the rubber clamping and sealing assembly in the inner cavity of the waterproof temperature probe connector 3 specifically includes: a rubber sealing layer 33 sleeved on the lead wire 33 of the temperature sensor, an inner clamping nut 34, and an outer clamping nut 35; the inner clamping nut 34 and the outer clamping nut 35 are located on the inner and outer sides of the rubber sealing layer 33, respectively, and are threadedly connected to the inner cavity wall of the waterproof temperature probe connector 3. The inner clamping nut 34 and the outer clamping nut 35 compress the rubber sealing layer 33 to deform it, thereby sealing the inner cavity channel of the waterproof temperature probe connector 3; for better sealing, waterproof silicone 36 is also filled at both the inner and outer ends of the inner cavity of the waterproof temperature probe connector.

[0034] Since the temperature sensor generates analog signals, and the distance between the temperature sensor and the instruments on the water surface is relatively far, to avoid signal loss, the first stainless steel branch line 111 is connected in series with a stainless steel temperature signal converter unit connector 112 via a compression fitting. The temperature signal converter unit connector 112 encapsulates an analog signal conversion circuit board that performs analog-to-digital conversion on the temperature signal output from the temperature sensor. The analog signal conversion circuit board promptly converts the analog signal generated by the temperature sensor into a digital signal before outputting it.

[0035] The triaxial vibration and temperature sensor 4 is installed on the outer wall of the submersible pump for monitoring vibration and temperature inside the pump. To achieve waterproof protection for the triaxial vibration and temperature sensor, the sensor is... Figure 7 and Figure 8The SS316 stainless steel triaxial vibration temperature sensor unit adapter 5 shown is fixedly installed and connected to the outer wall of the submersible pump; the inner wall of the front end of the triaxial vibration temperature sensor unit adapter 5 connected to the outer wall of the submersible pump is matched with the male thread of the triaxial vibration temperature sensor through a female thread; the lead wire of the triaxial vibration temperature sensor is led out through the tail end of the triaxial vibration temperature sensor unit adapter 5, and is sealed with the inner wall of the triaxial vibration temperature sensor unit adapter through sealant 51; the tail end of the triaxial vibration temperature sensor unit adapter is provided with an external thread, and is connected to a second stainless steel branch line 41 through an internal threaded compression fitting. In specific implementation, the triaxial vibration and temperature sensor includes a first MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the motor, a second MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the pump, and a third MEMS triaxial vibration and temperature composite sensor for monitoring the axial, longitudinal, and transverse vibration and temperature at the bearing. The first MEMS triaxial vibration and temperature composite sensor is installed in a countersunk hole in the motor cover via a triaxial vibration and temperature sensor unit adapter. The second MEMS triaxial vibration and temperature composite sensor is glued to the pump housing at the position corresponding to the sliding bearing using metal adhesive. The third MEMS triaxial vibration and temperature composite sensor is installed on the outside of the housing where the bearing is located. For example, if one of the triaxial vibration and temperature sensors 4 outputs an abnormal vibration or temperature signal, it can be determined that the bearing inside the housing corresponding to that triaxial vibration and temperature sensor 4 may be damaged.

[0036] Pressure sensor 6 is used to monitor the pressure of the medium inside the submersible pump's delivery pipe, thereby determining whether the delivery pipe has corroded and perforated, or whether the wear of the submersible pump blades and wear rings has increased. The pressure sensor is installed at the opening of the submersible pump's delivery pipe via a pressure sensor unit connector. The pressure sensor unit connector includes a cylindrical base that can be welded to the outer wall of the delivery pipe. The base corresponds to the opening on the delivery pipe, and the base has an internal thread for screwing the pressure sensor in and fixing it. The detection end of the pressure sensor 6 can be screwed into the base. A circular pipe section made of SS316 stainless steel is also welded onto the base to seal the pressure sensor 6. The end of the circular pipe section is screwed and sealed with an end cap. The lead wire of the pressure sensor is led out through the circular pipe section and the end cap. The end cap is also connected to a third stainless steel branch line 61 via an internal threaded compression fitting. Since the pressure sensor 6 outputs an analog signal, a pressure signal converter unit connector with the same structure as the temperature signal converter unit connector 112 can be connected in series on the third stainless steel branch line 61. The pressure signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the pressure signal output by the pressure sensor.

[0037] Displacement sensor 7 is mainly used to monitor the axis trajectory of the pump shaft at the connection between the motor and the pump, thereby monitoring the wear and breakage of the pump's rolling bearings; in order to make it applicable to seawater, this invention refers to... Figure 9 and Figure 10 As shown, the displacement sensor is connected to a displacement sensor unit adapter 8 via an external thread. The other end of the displacement sensor unit adapter 8 is connected to a fourth stainless steel branch line 71 via an internal threaded compression fitting. The fourth stainless steel branch line 71 is connected to the stainless steel main line. The lead wire of the displacement sensor is introduced into the stainless steel main line 9 via the displacement sensor unit adapter and the fourth stainless steel branch line. Similarly, the fourth stainless steel branch line 71 is connected in series with a stainless steel displacement sensor signal converter unit connector via a compression fitting. The displacement sensor signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the displacement signal output by the displacement sensor.

[0038] To facilitate quick disassembly and assembly during maintenance, the leads of the temperature sensor, triaxial vibration temperature sensor, pressure sensor, and displacement sensor are all equipped with quick-connect plugs. These quick-connect plugs are used to connect to the corresponding analog signal conversion circuit boards.

[0039] The preferred embodiment of the present invention is as follows: the first stainless steel branch line 111, the second stainless steel branch line 41, the third stainless steel branch line 61, the fourth stainless steel branch line 71, the temperature probe waterproof connector 3, the triaxial vibration temperature sensor unit conversion connector 5, the pressure sensor unit connector, and the displacement sensor unit conversion connector 8 are all made of SS316 stainless steel; the first stainless steel branch line 111, the second stainless steel branch line 41, the third stainless steel branch line 61, and the fourth stainless steel branch line 71 are respectively sealed to the SS316 stainless steel main line 9 through SS316 stainless steel tee connectors 91, and the upper end of the stainless steel main line 9 is sealed to an instrument cable connector, which is connected to the lead wires of the temperature sensor, the triaxial vibration temperature sensor, the pressure sensor, and the displacement sensor for electrical signal connection, thereby realizing that the lead wires of the temperature sensor, the triaxial vibration temperature sensor, and the pressure sensor are all led out through the stainless steel main line.

[0040] This invention is specifically designed for reliable operation in seawater environments. It utilizes six corresponding connectors to house various probes and sensors, ultimately connecting them to stainless steel conduits. This method, which adds a rigid, high-strength, waterproof shell to the monitoring components and cables, expands its application to more scenarios, overcoming the limitation of ordinary monitoring components being unsuitable for seawater use. The invention primarily employs SS316 stainless steel tubing as a waterproof protective layer. Various sampling units are connected via compatible connectors to form a complete waterproof system. Internal wiring uses miniature aviation plugs, and each sampling unit can be individually disassembled and replaced. During major overhauls of seawater pumps, the monitoring system can be disassembled section by section, and reassembled after the overhaul. Due to the use of SS316 stainless steel tubing and connectors, the overall strength can withstand certain external impacts and is also protected against damage caused by marine organism aggregation. In short, it provides a powerful waterproof armor for the monitoring system. Whether it's the temperature sensor or the triaxial vibration temperature composite sensor installed inside the seawater lift pump, or the sensor installed on the outer casing of the pump, all use 316 stainless steel compression fittings and pipelines to encapsulate the probe and lead-out cable inside the piping system to isolate it from seawater. After long-term testing, the monitoring system of this invention operates normally, with no leakage and no adverse effects on the function of the seawater pump itself. The conduit used in this invention is typically used in hydraulic or pneumatic pipelines with internal pressure below 40MPa in existing technologies. This invention applies it to 10 meters of water at 0.1MPa to resist external pressure. Essentially, its ability to isolate seawater far exceeds expectations. The various sensing components and cables inside such a piping system will not be corroded by seawater. Each pipeline interface is coated with liquid thread sealant to enhance water resistance, effectively meeting the application requirements of ordinary land-based monitoring elements in seawater. This modification approach can also be applied to power equipment monitoring in other seawater scenarios.

Claims

1. An online monitoring system for underwater equipment with a waterproof structure, comprising a temperature sensor installed inside a submersible pump for monitoring the temperature of the coolant and / or windings in the motor cavity, a triaxial vibration temperature sensor installed on the outer wall of the submersible pump, and a pressure sensor for monitoring the pressure of the medium; characterized in that: The submersible pump has a stainless steel temperature probe waterproof connector on its motor housing. The lead wire of the temperature sensor is led out of the motor housing through the temperature probe waterproof connector. The inner cavity of the temperature probe waterproof connector is equipped with a rubber clamping sealing component. One end of the temperature probe waterproof connector is connected to the threaded opening on the motor housing for sealing, and the other end is provided with an external thread and is connected to the first stainless steel branch line through an internal threaded ferrule connector. The triaxial temperature sensor is fixedly connected to the outer wall of the submersible pump via a stainless steel triaxial temperature sensor unit adapter. The inner wall of the front end of the triaxial temperature sensor unit adapter, which connects to the outer wall of the submersible pump, is connected to the male thread of the triaxial temperature sensor via a female thread. The lead wire of the triaxial temperature sensor is led out from the tail end of the triaxial temperature sensor unit adapter and sealed with sealant to the inner wall of the triaxial temperature sensor unit adapter. The tail end of the triaxial temperature sensor unit adapter is provided with an external thread and is connected to a second stainless steel branch line via an internal threaded compression fitting. The pressure sensor is installed at the opening of the submersible pump's delivery pipe via a pressure sensor unit connector. The pressure sensor unit connector includes a base with an internal thread for screwing the pressure sensor in and fixing it. A stainless steel round pipe section is also connected to the base, and an end cap is provided at the end of the round pipe section. The lead wire of the pressure sensor is led out through the round pipe section and the end cap. A third stainless steel branch line is also connected to the end cap via an internal threaded ferrule connector. The first, second, and third stainless steel branch lines are respectively connected to the main stainless steel line, and the leads of the temperature sensor, triaxial temperature sensor, and pressure sensor are all led out through the main stainless steel line. The triaxial vibration and temperature sensor includes a first MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the motor, a second MEMS triaxial vibration and temperature composite sensor for monitoring the vibration of the sliding bearing on the pump, and a third MEMS triaxial vibration and temperature composite sensor for monitoring the axial, longitudinal, and transverse vibration and temperature at the bearing. The first MEMS triaxial vibration and temperature composite sensor is installed in a countersunk hole in the motor cover via a triaxial vibration and temperature sensor unit adapter. The second MEMS triaxial vibration and temperature composite sensor is glued to the pump housing at the position corresponding to the sliding bearing using metal adhesive. The third MEMS triaxial vibration and temperature composite sensor is installed on the outside of the housing at the bearing location. The rubber clamping and sealing assembly in the inner cavity of the waterproof temperature probe connector includes a rubber sealing layer sleeved on the lead wire of the temperature sensor, an inner clamping nut, and an outer clamping nut; the inner clamping nut and the outer clamping nut are located on the inner and outer sides of the rubber sealing layer, respectively, and are threadedly connected to the inner cavity wall of the waterproof temperature probe connector, squeezing the rubber sealing layer to seal the inner cavity channel of the waterproof temperature probe connector; the inner and outer ends of the inner cavity of the waterproof temperature probe connector are also filled with waterproof silicone.

2. The underwater equipment online monitoring system with a waterproof structure according to claim 1, characterized in that: The temperature sensors include a coolant temperature sensor and a winding temperature sensor; the coolant temperature sensor is inserted into the coolant through an opening in the housing of the thrust bearing of the motor; the winding temperature sensor extends into the motor cavity through a through hole with a countersunk hole in the upper cover of the motor and is fixed to the winding.

3. The underwater equipment online monitoring system with a waterproof structure according to claim 1, characterized in that: The pressure sensor includes a first pressure sensor located at the pump outlet of the water delivery pipe, a second pressure sensor located at the wellhead of the water delivery pipe, and a third pressure sensor located at the bend of the water delivery pipe at the wellhead.

4. The underwater equipment online monitoring system with a waterproof structure according to claim 1, characterized in that: The first stainless steel branch line is connected in series with a stainless steel temperature signal converter unit connector via a compression fitting; the temperature signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the temperature signal output by the temperature sensor.

5. The underwater equipment online monitoring system with a waterproof structure according to claim 1, characterized in that: It also includes a displacement sensor that monitors the axis trajectory of the pump shaft at the connection between the motor and the pump; the displacement sensor is connected to a displacement sensor unit conversion connector via an external thread, and the other end of the displacement sensor unit conversion connector is connected to a fourth stainless steel branch line via an internal threaded ferrule connector; the fourth stainless steel branch line is connected to the stainless steel main line; the lead wire of the displacement sensor is introduced into the stainless steel main line through the displacement sensor unit conversion connector and the fourth stainless steel branch line.

6. The underwater equipment online monitoring system with a waterproof structure according to claim 5, characterized in that: The fourth stainless steel branch line is connected in series with a stainless steel displacement sensor signal converter unit connector via a compression fitting; the displacement sensor signal converter unit connector contains an analog signal conversion circuit board that performs analog-to-digital conversion on the displacement signal output by the displacement sensor.

7. The underwater equipment online monitoring system with a waterproof structure according to claim 5, characterized in that: The temperature sensor, triaxial vibration temperature sensor, pressure sensor, and displacement sensor all have quick-connect plugs on their leads.

8. The underwater equipment online monitoring system with a waterproof structure according to claim 5, characterized in that: The first, second, third, and fourth stainless steel branch lines, the waterproof connector for the temperature probe, the conversion connector for the triaxial vibration temperature sensor unit, the connector for the pressure sensor unit, and the conversion connector for the displacement sensor unit are all made of SS316 stainless steel. The first, second, third, and fourth stainless steel branch lines are each sealed to the main SS316 stainless steel line via SS316 stainless steel tee connectors. The upper end of the main stainless steel line is sealed to an instrument cable connector, which is connected to the lead wires of the temperature sensor, the triaxial vibration temperature sensor, the pressure sensor, and the displacement sensor for electrical signal connection.

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