Modularized oil injection device and vacuum auxiliary oil injection method for underwater wet-plugging electric connector

Abstract

The invention discloses an underwater electrical interconnection equipment manufacturing technology, and aims to provide an underwater wet-plugging electric connector modularized oil injection device and a vacuum auxiliary oil injection method. The technical scheme is characterized in that the underwater wet-plugging electric connector modularized oil injection device comprises a precise oil injector, a multifunctional pressing plate and a flange locking module; the precise oil injector is a cylindrical body made of a stainless steel material, a through hole is coaxially formed in the center of the precise oil injector, an oil injection connecting hole coaxial with the through hole is formed in the top of the precise oil injector, and the oil injection connecting hole is communicated with the through hole. A side hole which is perpendicular to the axis of the through hole and is communicated with the through hole to form a connecting channel is formed in the bottom of the jack oil bag so as to be communicated with the jack oil bag and convey oil to the jack oil bag; the method is suitable for the technical field of underwater electrical interconnection equipment manufacturing.

Description

Technical Field

[0001] The present invention relates to a technology for manufacturing underwater electrical interconnection equipment, and more specifically, to a modular oiling device for underwater wet-pluggable electrical connectors and a vacuum-assisted oiling method. Background Art

[0002] Traditional wet-plug connector lubrication often uses syringes, which can lead to residual bubbles. This method creates a blind spot within the oil pocket, leaving less than 1% of bubbles trapped. This reduces the dielectric strength of the wet-plug connector during plugging and unplugging. Similar issues also exist with the external oil pocket. Split tooling requires multiple disassembly and assembly, requiring multiple lubrication cycles for multiple sockets, making lubrication of individual components time-consuming. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a modular oiling device and a vacuum-assisted oiling method for underwater wet-pluggable electrical connectors.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a modular oiling device for underwater wet-pluggable electrical connectors, comprising a precision oiler, a multifunctional pressure plate, and a flange locking module, for implementing the sealing and oiling operation of the jack oil bag and the outer oil bag of the underwater wet-pluggable electrical connector:

[0005] The precision oiler is a columnar body made of stainless steel, with a through hole coaxially arranged at its center, an oil injection connection hole coaxial with the through hole at the top, and a side hole perpendicular to the axis of the through hole and connected to the through hole to form a connecting channel at the bottom to achieve communication with the oil sac at the jack for delivering oil to the oil sac at the jack;

[0006] The multifunctional pressure plate is made of stainless steel and forms an H7 / g6 clearance fit with the precision oiler. The pressure plate is provided with a diversion micro-hole coaxial with the oil injection connection hole. A central diversion hole is also provided at the center of the pressure plate for connecting the flow channel with the external oil sac of the wet-plug electrical connector, enabling oil to be transported to the external oil sac.

[0007] The flange locking module includes a fixed flange having an O-ring groove formed on its lower end surface, in which a composite O-ring is installed. The fixed flange is provided with six sets of screws arranged in a circular array around the center of the fixed flange. The six sets of screws are pre-tightened at 60° intervals, and torque is controlled during the pre-tightening process to achieve compression and fixation of the fixed flange to the multi-function pressure plate and precision oiler.

[0008] The precision oiler, the multifunctional pressing plate, the fixing flange and the wet pluggable electrical connector housing are assembled by screws to form an axial compression chain.

[0009] The application is further provided with: the ratio of the diameter of the through hole of the precision oil injector to the diameter of the side hole of the bottom is 1.5-2:1; the center flow guide hole penetrates the pressing plate at an inclination angle of 15-25° and the cross-sectional area of the center flow guide hole decreases gradually.

[0010] The application is further provided with: the main body material of the composite O-ring is hydrogenated nitrile rubber or fluororubber, and the hardness is 70±5 Shore A, which is used to realize the sealing between components; the compression rate of the composite O-ring is set to 18-22%.

[0011] The application is further provided with: the ratio of the depth of the O-ring groove to the cross-sectional diameter of the composite O-ring is 0.6:1-0.8:1.

[0012] The vacuum-assisted oil injection method of the modular oil injection device of the underwater wet plug-in electrical connector is characterized in that it comprises the following steps:

[0013] S1, tool pre-installation:

[0014] The precision oil injector and the composite O-ring are immersed in silicone oil for 30 seconds, and the required equipment and detection equipment during the oil injection process are calibrated; then the wet plug-in electrical connector is placed in a temperature-controllable environment, and a temperature detection module is started to detect the initial temperature of the wet plug-in electrical connector; if the initial temperature is less than 28℃, a heating device is started to heat the wet plug-in electrical connector until the temperature of the wet plug-in electrical connector reaches 30±2℃; if the initial temperature is greater than 32℃, a cooling device is started to cool the wet plug-in electrical connector until the temperature of the wet plug-in electrical connector reaches 30±2℃; after the temperature of the wet plug-in electrical connector stabilizes at 30±2℃, the assembly operation is performed in sequence: the precision oil injector is inserted into the jack oil pocket in the wet plug-in electrical connector, ensuring the tightness of the connection between the precision oil injector and the jack oil pocket, the initial pressure at the connection between the precision oil injector and the jack oil pocket is detected by a pressure detection module, if the initial pressure is less than 0.1MPa, the precision oil injector needs to be re-plugged until the pressure at the connection reaches 0.1MPa or above; then the pressing plate is sleeved on the precision oil injector, and the fitting gap between the pressing plate and the precision oil injector is checked; then, after the composite O-ring is installed in the O-ring groove of the fixed flange, the fixed flange is pressed tightly on the pressing plate, and finally, 6 groups of screws are tightened in a cross-tightening manner, and in the tightening process, the tightening torque of each screw is monitored in real time by a torque sensor, and when the torque of each screw reaches the preset minimum torque value and the torque difference between the screws is not more than 5%, the tightening operation is stopped; after the above assembly is completed, silicone oil or transformer oil is filled into the precision oil injector;

[0015] S2, preliminary oil injection of the jack oil pocket:

[0016] According to the design parameters of the wet plug-in electrical connector, the theoretical oil injection amount of the jack oil bladder is calculated, the oil injection control module is started to inject oil into the jack oil bladder, and the oil injection amount is monitored in real time through the flow metering module; during the oil injection process, the density of the oil is detected every 5s through the density detection module, the detected density value is compared with the standard density value, if the density value deviation exceeds ±2%, the oil injection is paused, the oil is checked whether it meets the requirements, if the oil does not meet the requirements, the oil injection is restarted after the oil is replaced; when the oil injection amount reaches 80% of the theoretical oil injection amount, the oil injection speed is reduced to 50% of the initial oil injection speed, and the oil injection continues; when the oil injection amount reaches 110% of the theoretical oil injection amount, the oil injection control module issues a stop oil injection instruction, and the oil injection into the jack oil bladder is stopped; after the oil injection is stopped, the pressure in the jack oil bladder is detected through the pressure sensor, if the pressure value exceeds the preset maximum pressure value, the pressure relief valve is started to release pressure until the pressure value returns to the normal range; at the same time, the visual detection module is used to observe whether the jack oil bladder has overflow phenomenon, if there is overflow, the overflow oil amount is recorded, and the oil injection amount is recalculated for supplementary oil injection, after the supplementary oil injection, the overflow is detected again until no overflow phenomenon occurs;

[0017] S3, outer oil bladder pressure infusion:

[0018] The outer oil bladder oil injection system is started, and pressure infusion is performed on the outer oil bladder, the infusion pressure is adjusted through the pressure control module, the initial infusion pressure is set to 0.1MPa, and then the infusion pressure is gradually increased at a rate of 0.05MPa / s; during the infusion process, the flow field state of the oil in the outer oil bladder is monitored in real time through the flow field detection module, if turbulent flow phenomenon is detected in the flow field, the turbulent flow judgment standard is that the change rate of the velocity gradient in the flow field exceeds the preset threshold, the infusion pressure increase rate is reduced to 0.02MPa / s, and the flow field state is continuously monitored, until the turbulent flow phenomenon disappears, the infusion pressure is increased at a rate of 0.05MPa / s; when the oil starts to flow out of the overflow port during the infusion, the timing module is started, the current infusion pressure is maintained for pressure maintenance, and the pressure maintenance time is set to 10s; during the pressure maintenance process, the pressure fluctuation detection module is used to monitor the pressure fluctuation, if the pressure fluctuation amplitude exceeds ±0.02MPa, the pressure maintenance time is extended by 5s, and the pressure fluctuation is detected again, until the pressure fluctuation amplitude is stable within ±0.02MPa;

[0019] S4, overall vacuum defoaming:

[0020] S4-1, rough vacuum:

[0021] Put the assembled wet plug-in electrical connector and oil injection device into the vacuum chamber, close the vacuum chamber door, start the vacuum pumping device to perform rough vacuum pumping operation, and set the target vacuum degree to 0.05 MPa; during the vacuum pumping process, the vacuum degree in the vacuum chamber is monitored in real time through the vacuum degree detection module, the vacuum degree value is recorded once every 30 s, and the vacuum degree-time curve is drawn; compare the actual curve with the preset standard curve, if the deviation between the actual curve and the standard curve is within ±5%, continue to pump vacuum until the target vacuum degree is reached and maintained for 2 min; if the deviation exceeds ±5%, check the sealing performance of the vacuum chamber, if there is leakage, repair it, and start the rough vacuum pumping operation again after repair;

[0022] S4-2, micro-bubble precipitation vacuum pumping:

[0023] After the rough vacuum pumping stage is over, the parameters of the vacuum pumping device are adjusted, the vacuum pumping operation in the micro-bubble precipitation stage is performed, and the target vacuum degree is set to 0.095 MPa; in this stage, the number and size of bubbles in the oil bladder are monitored in real time through the bubble detection module, and a bubble distribution report is generated once every 1 min; when the average diameter of the bubbles is <5 μm and the number growth rate is <1 per second, the current vacuum degree is maintained; if the average diameter is >5 μm or the number growth rate is >1 per second, the vacuum degree is increased by 0.002 MPa, and the bubble state is detected again until the bubble state meets the requirements; after reaching the target vacuum degree, maintain for 8 min, and during the maintenance process, the viscosity of the oil is detected once every 2 min, if the viscosity change rate exceeds ±3%, adjust the vacuum degree to compensate for the viscosity change, to ensure that the micro-bubbles can be precipitated smoothly;

[0024] S4-3, slow release to atmospheric pressure:

[0025] After the micro-bubble precipitation stage is over, the pressure in the vacuum chamber is slowly released to atmospheric pressure, and the pressure rising rate is set to ≤5 kPa / s; the pressure rising rate is accurately controlled through the pressure control module, the pressure rising value is detected once every 5 s, if the actual rising rate exceeds the set rate, the opening of the air inlet valve is reduced to slow down the pressure rising; at the same time, the volume change of the oil bladder is monitored in real time through the volume detection module, the volume shrinkage rate of the oil bladder is calculated, if the volume shrinkage rate is >0.8%, the pressure rising is paused, the current pressure is maintained for 1 min, and then the rising is continued, until the volume shrinkage rate is ≤0.8%; when the pressure returns to atmospheric pressure, maintain for 5 min, during which whether there is any abnormality in each sealing part is detected, if there is any abnormality, it is processed and the slow release operation is performed again;

[0026] S5, environmental adaptability adjustment:

[0027] During the oil injection and vacuum treatment process, the ambient temperature is monitored in real time by the ambient temperature detection module, if the ambient temperature > 40℃, the high temperature environment adaptation program is started: the oil is replaced with low viscosity silicone oil, the viscosity is 100cSt, at the same time, the temperature compensation is increased in the vacuum stage, that is, the oil temperature is increased by 5℃, the vacuum degree is increased by 0.005MPa; After replacing the oil, the performance parameters of the oil are detected again to ensure that it meets the use requirements in the high temperature environment; if the ambient temperature is ≤40℃, the original oil and vacuum degree parameters are maintained;

[0028] S6, final detection and judgment:

[0029] After completing all the above steps, the wet plug-in electrical connector after oil injection is comprehensively detected, including detecting the proportion of bubbles in the oil bag by X-ray imaging, if the residual rate of bubbles in the jack oil bag is <0.03% and the residual rate of bubbles in the outer oil bag is <0.05%, it is determined that the oil injection is qualified; if the bubble residual rate does not meet the requirements, the vacuum bubble removal is re-performed in S4 until the detection is qualified.

[0030] The application is further provided that: in S1, the preset minimum torque value is determined according to the material and size of the fixed flange, and the torque difference between each screw is controlled between 3%-5%.

[0031] The application is further provided that: in S2, the calculation of the theoretical oil injection amount considers the geometric size of the jack oil bag of the wet plug-in electrical connector, the expansion coefficient of the oil and the influence of the ambient temperature, wherein the expansion coefficient of the oil is 0.0005-0.0008 / ℃, so as to ensure that the reserved 10% expansion space can adapt to the volume change of the oil at different temperatures.

[0032] The application is further provided that: in S3, the ratio of the initial perfusion pressure of the outer oil bag to the volume of the outer oil bag of the wet plug-in electrical connector is 0.01MPa / mL-0.02MPa / mL.

[0033] The beneficial effects of the application are:

[0034] 1. Compared with the prior art, the modular oiling device of the underwater wet-pluggable electrical connector of the present invention realizes efficient sealed oiling of the jack oil bag and the outer oil bag through the coordinated design of the precision oiler, the multifunctional pressure plate and the flange locking module; the precision oiler adopts a stainless steel cylindrical structure, and the connecting channel formed by the central through hole and the side hole ensures that the oil is accurately delivered to the jack oil bag, thereby improving the targeting of the oiling; the H7 / g6 level clearance fit between the multifunctional pressure plate and the precision oiler not only ensures the assembly accuracy but also reduces the risk of oil leakage, and the central guide hole realizes the synchronous oiling of the outer oil bag, thereby improving the operating efficiency; the 6 groups of annular array screws of the flange locking module are pre-tightened and the torque is controlled according to 60° graduations to ensure uniform axial pressure of each component and ensure stable installation; the combination of the composite O-ring and the O-ring groove enhances the sealing performance; the present oiling device reduces the residual rate of bubbles and improves the oiling efficiency.

[0035] 2. In the modular oiling device of the underwater wet-pluggable electrical connector of the present invention, the ratio design of the through hole and the side hole diameter is 1.5-2:1, which can balance the oil flow and pressure, avoid oil splashing due to too fast flow rate or low oiling efficiency due to too slow flow rate, and at the same time avoid the mixing of bubbles; the inclination angle of 15°-25° and the gradient decreasing structure of the cross-sectional area of ​​the central guide hole can guide the oil to form a stable laminar flow, reduce turbulence during oiling of the outer oil bag, and reduce the probability of bubble generation; this structural design makes the energy loss of the oil smaller during the transportation process, improves the uniformity of oiling, and facilitates the control of the oiling amount, ensuring that the oil filling density of the jack oil bag and the outer oil bag is consistent, laying a good foundation for the subsequent vacuum defoaming process and improving the overall oiling quality.

[0036] 3. In the present invention, by limiting the material, hardness and compression rate of the composite O-ring, the sealing performance and durability of the device are significantly enhanced; hydrogenated nitrile rubber or fluororubber has excellent oil resistance, water resistance and aging resistance, which can extend the service life of the seal; the hardness of 70±5ShoreA ensures that the composite O-ring has sufficient elasticity to fill the sealing gap when under pressure, and is not prone to failure due to excessive deformation; the 18-22% compression rate design makes the composite O-ring fit tightly against the sealing surface, effectively blocking the intrusion of external moisture and impurities, while avoiding permanent deformation of the composite O-ring caused by excessively high compression rate or poor sealing caused by too low compression rate; this design greatly improves the sealing reliability of the device, reduces maintenance frequency, and reduces sealing problems.

[0037] 4. The present invention has a simple and reasonable structure, is easy to manufacture, and is easy to operate. It avoids the defects of the prior art and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Fig. 1 This is a structural diagram of the modular oiling device for underwater wet-pluggable electrical connectors of the present invention.

[0039] Fig. 2The structural diagram of the precision oil injector in the modular oil injection device of the underwater wet plug-in electrical connector.

[0040] Figs. 1-2 The figure shows a modular oil injection device of an underwater wet plug-in electrical connector, comprising a precision oil injector 1, a multifunctional pressing plate 2, and a flange locking module, which are used to realize the sealed oil injection operation of the jack oil bladder and the outer oil bladder of the underwater wet plug-in electrical connector. DETAILED DESCRIPTION

[0041] REFERENCE Figs. 1-2 The modular oil injection device of the underwater wet plug-in electrical connector and the vacuum-assisted oil injection method embodiment of the present application are further described.

[0042] For ease of description, spatial relative terms such as "upper", "lower", "left", "right", etc. are used in the embodiments to describe the relationship of one element or feature to another element or feature shown in the drawings. It should be understood that, in addition to the orientation shown in the drawings, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the drawings is inverted, the element described as being "below" other elements or features will be positioned "above" the other elements or features. Therefore, the exemplary term "below" can include both upward and downward orientations. The device can be positioned in other ways (rotated 90 degrees or positioned in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly.

[0043] Moreover, relational terms such as "first" and "second" are merely used to distinguish one component from another component having the same name, and do not necessarily require or imply any such actual relationship or order between the components.

[0044] Figs. 1-2 The figure shows a modular oil injection device of an underwater wet plug-in electrical connector, comprising a precision oil injector 1, a multifunctional pressing plate 2, and a flange locking module, which are used to realize the sealed oil injection operation of the jack oil bladder and the outer oil bladder of the underwater wet plug-in electrical connector.

[0045] The precision oil injector 1 is a cylindrical body made of stainless steel material, with a through hole 3 coaxially arranged in the center, an oil injection connecting hole 4 coaxially arranged at the top, and a side hole 5 arranged at the bottom and perpendicular to the axis of the through hole 3 to form a connecting channel in communication with the through hole 3, to realize the communication with the jack oil bladder and deliver oil to the jack oil bladder.

[0046] The multifunctional pressure plate 2 is made of stainless steel and forms an H7 / g6 clearance fit with the precision oiler 1. The pressure plate 2 is provided with a diversion microhole 6 coaxially arranged with the oil injection connection hole 4. A central diversion hole 7 is also provided at the center of the pressure plate 2 for connecting the flow channel with the external oil sac of the wet-plug electrical connector, thereby transferring oil to the external oil sac.

[0047] The flange locking module includes a fixed flange 8, the lower end surface of which is provided with an O-ring groove 9, in which a composite O-ring 10 is installed. The fixed flange 8 is provided with six groups of screws 11 arranged in a circular array with the fixed flange 8 as the center. The six groups of screws 11 are pre-tightened at a 60° interval, and torque is controlled during the pre-tightening process to achieve compression and fixation of the fixed flange 8 to the multi-function pressure plate 2 and the precision oiler 1.

[0048] The precision oiler 1, the multifunctional pressing plate 2, the fixing flange 8 and the wet-plug electrical connector housing 12 are assembled by screws 11 to form an axial compression chain;

[0049] Through the coordinated design of the precision oiler 1, the multifunctional pressure plate 2 and the flange locking module, efficient sealing and oiling of the socket oil bag and the outer oil bag is achieved; the precision oiler 1 adopts a stainless steel cylindrical structure, and the connecting channel formed by the central through hole 3 and the side hole 5 ensures that the oil is accurately delivered to the socket oil bag, thereby improving the targeting of the oiling; the H7 / g6 level clearance fit between the multifunctional pressure plate 2 and the precision oiler 1 not only ensures the assembly accuracy but also reduces the risk of oil leakage, and the central guide hole 7 realizes the synchronous oiling of the outer oil bag, thereby improving the operating efficiency; the 6 groups of annular array screws 11 of the flange locking module are pre-tightened and the torque is controlled at 60°, ensuring uniform axial pressure of each component and ensuring stable installation; the combination of the composite O-ring 10 and the O-ring groove 9 enhances the sealing; this oiling device reduces the bubble residual rate and improves the oiling efficiency.

[0050] The ratio of the diameter of the through hole 3 of the precision oiler 1 to the diameter of the side hole 5 at the bottom is 1.5-2:1; the central guide hole 7 penetrates the pressure plate 2 at an inclination angle of 15°-25° and the cross-sectional area of ​​the central guide hole 7 decreases gradually;

[0051] The 1.5-2:1 ratio design of the diameter of the through hole 3 and the side hole 5 can balance the oil flow and pressure, avoid oil splashing due to too fast flow rate or low oil filling efficiency due to too slow flow rate, and at the same time avoid the mixing of bubbles; the inclination angle of the central guide hole 715°-25° and the gradient decreasing structure of the cross-sectional area can guide the oil to form a stable laminar flow, reduce turbulence during oil filling of the outer oil bag, and reduce the probability of bubble generation; this structural design makes the energy loss of the oil smaller during the transportation process, improves the uniformity of oil filling, and facilitates the control of the oil filling amount, ensuring that the oil filling density of the plug oil bag and the outer oil bag is consistent, laying a good foundation for the subsequent vacuum defoaming process and improving the overall oil filling quality.

[0052] The main material of the composite O-ring 10 is hydrogenated nitrile rubber or fluororubber, with a hardness of 70±5 Shore A, and is used to achieve sealing between various components; the compression rate of the composite O-ring 10 is set to 18-22%;

[0053] By limiting the material, hardness and compression rate of the composite O-ring 10, the sealing performance and durability of the device are significantly enhanced; hydrogenated nitrile rubber or fluororubber materials have excellent oil resistance, water resistance and aging resistance, which can extend the service life of the seal; the hardness of 70±5ShoreA ensures that the composite O-ring 10 has sufficient elasticity to fill the sealing gap when under pressure, and is not prone to failure due to excessive deformation; the 18-22% compression rate design makes the composite O-ring 10 fit tightly against the sealing surface, effectively blocking the intrusion of external moisture and impurities, while avoiding permanent deformation of the composite O-ring 10 due to excessively high compression rate or poor sealing due to too low compression rate; this design greatly improves the sealing reliability of the device, reduces maintenance frequency, and reduces the risk of sealing problems.

[0054] The ratio of the depth of the O-ring groove 9 to the cross-sectional diameter of the composite O-ring 10 is 0.6:1-0.8:1;

[0055] By limiting the proportion, the sealing structure performance is further optimized; this proportion ensures that the composite O-ring 10 can obtain a reasonable compression space after installation. When the fixed flange 8 is tightened, the composite O-ring 10 can deform appropriately in the groove, which can fully fill the gap between the O-ring groove 9 and the mating surface, and will not cause the composite O-ring 10 to be damaged by excessive extrusion due to the groove being too shallow, or the composite O-ring 10 to be insufficiently compressed due to the groove being too deep, affecting the sealing effect; this structural design enables the sealing effect of the composite O-ring 10 to be fully exerted, improves the sealing and stability of the connection between the various components, and at the same time facilitates the installation and replacement of the protective O-ring, reduces the difficulty of assembly, and provides a guarantee for the long-term stable operation of the device.

[0056] A vacuum-assisted oiling method for a modular oiling device for underwater wet-pluggable electrical connectors, comprising the following steps:

[0057] S1. Pre-installation of tooling:

[0058] The precision oiler 1 and the composite O-ring 10 are immersed in silicone oil for 30 seconds, and the oil injection device, the equipment required during the oil injection process, and the detection equipment are calibrated; then the wet plug-in electrical connector is placed in a temperature controllable environment, and the temperature detection module is started to detect the initial temperature of the wet plug-in electrical connector; if the initial temperature is less than 28°C, the heating device is started to heat the wet plug-in electrical connector until the temperature of the wet plug-in electrical connector reaches 30±2°C; if the initial temperature is greater than 32°C, the cooling device is started to cool the wet plug-in electrical connector until the temperature of the wet plug-in electrical connector reaches 30±2°C; after the temperature of the wet plug-in electrical connector stabilizes at 30±2°C, the assembly operation is performed in sequence: the precision oiler 1 is inserted into the oil pocket in the wet plug-in electrical connector, ensuring that the precision oiler 1 and the oil pocket are tightly connected, the initial pressure at the connection between the precision oiler 1 and the oil pocket is detected by the pressure detection module, and if the initial pressure is less than 0.1 MPa, the precision oiler 1 needs to be reinserted until the pressure at the connection reaches 0.1 MPa or above; then the pressure plate 2 is sleeved on the precision oiler 1, and the gap between the pressure plate 2 and the precision oiler 1 is checked; then, after the composite O-ring 10 is installed in the O-ring groove 9 of the fixed flange 8, the fixed flange 8 is pressed tightly on the pressure plate 2, and finally the 6 groups of screws 11 are tightened in a cross tightening manner, and in the tightening process, the tightening torque of each screw 11 is monitored in real time by the torque sensor, and when the torque of each screw 11 reaches the preset minimum torque value and the torque difference between the screws 11 is not more than 5%, the tightening operation is stopped; after the above assembly is completed, silicone oil or transformer oil is filled into the precision oiler 1;

[0059] S2, initial oil injection of the oil pocket:

[0060] According to the design parameters of the wet plug-in electrical connector, the theoretical oil injection amount of the oil pocket is calculated, the oil injection control module is started to inject oil into the oil pocket, and the flow metering module is used to monitor the oil injection amount in real time; during the oil injection process, the density of the oil is detected by the density detection module every 5 seconds, and the detected density value is compared with the standard density value; if the density deviation exceeds ±2%, the oil injection is temporarily stopped, and the oil is checked to see if it meets the requirements; if the oil does not meet the requirements, the oil is replaced and the oil injection is restarted; when the oil injection amount reaches 80% of the theoretical oil injection amount, the oil injection speed is reduced to 50% of the initial oil injection speed, and the oil injection continues; when the oil injection amount reaches 110% of the theoretical oil injection amount, the oil injection control module issues a stop oil injection instruction, and the oil injection into the oil pocket is stopped; after the oil injection is stopped, the pressure in the oil pocket is detected by the pressure sensor, and if the pressure value exceeds the preset maximum pressure value, the pressure relief valve is started to relieve pressure until the pressure value returns to the normal range; at the same time, the visual detection module is used to observe whether there is overflow of the oil pocket, and if there is overflow, the amount of overflow is recorded and the oil injection amount is recalculated for supplementary oil injection; after the supplementary oil injection, the overflow is detected again until no overflow occurs.

[0061] S3. External oil bag pressure perfusion:

[0062] Start the outer oil bag oil filling system and perform pressure filling into the outer oil bag. The filling pressure is adjusted by the pressure control module. The initial filling pressure is set to 0.1MPa, and then the filling pressure is gradually increased at a rate of 0.05MPa / s. During the filling process, the flow field state of the oil in the outer oil bag is monitored in real time by the flow field detection module. If turbulence is detected in the flow field, the turbulence judgment standard is that the rate of change of the velocity gradient in the flow field exceeds the preset threshold, then the filling pressure increase rate is reduced to 0.02MPa / s and continued. Monitor the flow field state until the turbulence disappears, then increase the injection pressure at a rate of 0.05 MPa / s. When the oil begins to flow out of the overflow port, start the timing module to maintain the current injection pressure for 10 seconds. During the pressure-holding process, monitor the pressure fluctuations through the pressure fluctuation detection module. If the pressure fluctuation amplitude exceeds ±0.02 MPa, extend the pressure holding time by 5 seconds and re-check the pressure fluctuation until the pressure fluctuation amplitude stabilizes within ±0.02 MPa.

[0063] S4, overall vacuum defoaming:

[0064] S4-1, rough vacuuming:

[0065] Place the assembled wet-plug electrical connector and oil filling device into the vacuum chamber, close the vacuum chamber door, start the vacuum pumping device to perform rough vacuum operation, and set the target vacuum degree to 0.05MPa; during the vacuum process, the vacuum degree in the vacuum chamber is monitored in real time by the vacuum detection module, the vacuum degree value is recorded every 30 seconds, and a curve of the vacuum degree change over time is plotted; the actual curve is compared with the preset standard curve. If the deviation between the actual curve and the standard curve is within ±5%, continue vacuuming until the target vacuum degree is reached and maintain it for 2 minutes; if the deviation exceeds ±5%, check the sealing of the vacuum chamber. If there is a leak, repair it, and restart the rough vacuum operation after repair;

[0066] S4-2, vacuuming for micro-bubble precipitation:

[0067] After the rough vacuuming stage is completed, the parameters of the vacuum pumping device are adjusted to carry out the vacuuming operation in the microbubble precipitation stage, and the target vacuum degree is set to 0.095MPa. During this stage, the number and size of bubbles in the oil sac are monitored in real time through the bubble detection module, and a bubble distribution report is generated every 1 minute. When the average diameter of the bubbles is less than 5μm and the number growth rate is less than 1 / second, the current vacuum degree is maintained. If the average diameter is greater than 5μm or the number growth rate is greater than 1 / second, the vacuum degree is increased by 0.002MPa and the bubble status is re-checked until the bubble status meets the requirements. After reaching the target vacuum degree, it is maintained for 8 minutes. During the maintenance process, the viscosity of the oil is checked every 2 minutes. If the viscosity change rate exceeds ±3%, the vacuum degree is adjusted to compensate for the viscosity change to ensure that the microbubbles can be smoothly precipitated.

[0068] S4-3, sustained release to normal pressure:

[0069] After the microbubble precipitation stage is completed, the pressure in the vacuum chamber is slowly released to normal pressure, and the pressure recovery rate is set to ≤5kPa / s. The pressure recovery rate is precisely controlled by the pressure control module, and the pressure recovery value is detected every 5 seconds. If the actual recovery rate exceeds the set rate, the opening of the intake valve is reduced to slow down the pressure recovery. At the same time, the volume change of the oil bladder is monitored in real time through the volume detection module, and the volume shrinkage rate of the oil bladder is calculated. If the volume shrinkage rate is greater than 0.8%, the pressure recovery is suspended, and the current pressure is maintained for 1 minute before continuing to recover until the volume shrinkage rate is ≤0.8%. After the pressure returns to normal pressure, it is maintained for 5 minutes. During this period, the sealing parts are checked for any abnormalities. If any abnormalities are found, they are treated and the slow release operation is repeated.

[0070] S5. Environmental adaptability adjustment:

[0071] During the oil filling and vacuum treatment process, the ambient temperature is monitored in real time through the ambient temperature detection module. If the ambient temperature is greater than 40°C, the high temperature environment adaptation program is initiated: the oil is replaced with low-viscosity silicone oil with a viscosity of 100 cSt. At the same time, temperature compensation is added during the vacuum stage, that is, the vacuum degree increases by 0.005 MPa for every 5°C increase in oil temperature. After the oil is replaced, the various performance parameters of the oil are retested to ensure that they meet the requirements for use in a high temperature environment. If the ambient temperature is ≤40°C, the original oil and vacuum parameters are maintained.

[0072] S6. Final inspection and judgment:

[0073] After completing all the above steps, the wet-pluggable electrical connector after oil filling is fully inspected, including detecting the percentage of bubbles in the oil sac through X-ray imaging. If the bubble residual rate in the oil sac of the socket is less than 0.03% and the bubble residual rate in the outer oil sac is less than 0.05%, the oil filling is considered qualified. If the bubble residual rate does not meet the requirements, go to S4 and perform vacuum degassing again until the test is qualified.

[0074] The vacuum-assisted oil injection method significantly improves the oil injection quality and efficiency through multi-step fine control. The tool pre-installation stage S1 performs silicon oil immersion, temperature regulation, and pressure detection on the parts to ensure that the assembly environment and initial state meet the requirements, reducing oil injection defects caused by temperature fluctuations or loose connections. Cross-tightening screws 11 are used to control the torque difference and ensure uniform stress distribution during assembly. Real-time monitoring and adjustment of parameters such as flow, pressure, and density during the oil injection process of the jack oil bag and the outer oil bag in S2 and S3 avoid excessive or insufficient oil and reduce bubble generation. The three-stage vacuum bubble removal process in S4 gradually removes bubbles in the oil bag from coarse pumping to micro-bubble release to slow release to normal pressure, ensuring efficient bubble removal combined with bubble detection and viscosity compensation. The environmental adaptability adjustment in S5 ensures stable performance of the device at different temperatures, and the final detection in S6 strictly controls the bubble residual rate through X-ray imaging to ensure oil injection qualification. The overall method process is standardized and highly automated, significantly improving the oil injection reliability and consistency of wet plug-in electrical connectors.

[0075] In S1, the preset minimum torque value is determined according to the material and size of the fixed flange 8, and the torque difference between each screw 11 is controlled between 3%-5%;

[0076] By limiting the minimum torque value and torque difference of the screws 11, the stability and safety of the device assembly are enhanced. The minimum torque value is determined according to the material and size of the fixed flange 8, which can prevent parts from loosening due to insufficient torque and ensure that the compression force of the axial compression chain meets the sealing requirements. The torque difference control between 3%-5% between each screw 11 can effectively prevent the deformation of the fixed flange 8 or the inclination of the sealing surface caused by uneven stress, avoiding local sealing failure. This design makes the force distribution more uniform during assembly, reduces damage to parts caused by stress concentration, prolongs the service life of the device, reduces the risk of oil leakage during the oil injection process caused by improper assembly, and improves the safety and reliability of the overall operation.

[0077] In S2, the calculation of the theoretical oil injection volume considers the geometric size of the wet plug-in electrical connector jack oil bag, the expansion coefficient of the oil, and the influence of the environmental temperature, with the expansion coefficient of the oil ranging from 0.0005 to 0.0008 / ℃ to ensure that the reserved 10% expansion space can adapt to the volume change of the oil at different temperatures;

[0078] Theoretical oil injection amount calculation considers the influence of geometric size, oil expansion coefficient and environmental temperature, effectively improving the accuracy and adaptability of oil injection; the oil expansion coefficient value range of 0.0005-0.0008 / ℃, combined with the reserved 10% expansion space, can compensate for the volume change of oil at different temperatures, avoiding the cavity caused by the volume contraction of oil at low temperature or the rupture of the oil bag caused by the volume expansion at high temperature; this calculation method makes the oil injection amount more suitable for the actual working environment requirements, ensures that the oil bag of the wet plug-in electrical connector always maintains a reasonable filling state in the underwater environment with large temperature fluctuations, improves the stability and safety of equipment operation, and reduces performance failures caused by oil volume changes.

[0079] In the S3, the ratio of the initial filling pressure of the outer oil bag to the volume of the outer oil bag of the wet plug-in electrical connector is 0.01 MPa / mL-0.02 MPa / mL.

[0080] By limiting the ratio of the initial filling pressure of the outer oil bag to the volume, the pressure control of the outer oil bag injection is optimized, and the injection effect is improved; the ratio of 0.01 MPa / mL-0.02 MPa / mL can match the appropriate initial pressure according to the size of the outer oil bag volume, avoiding the splashing of oil caused by too high pressure, the damage of the oil bag or the slow injection speed and insufficient filling caused by too low pressure; this pressure and volume adaptive relationship makes the outer oil bag injection process more stable, and the oil can be uniformly filled into every corner, reducing the generation of air bubbles, and facilitating subsequent pressure adjustment and pressure maintaining operation, ensuring the quality of the outer oil bag injection and improving the overall performance of the underwater wet plug-in electrical connector.

[0081] The water pressure resistance of the precision oil injector 1 in the application can be applied to a working water depth of 6000m, and can realize full ocean application with the tail pressure balance hose; the oil is operated in the real environment, avoiding the entry of water vapor and affecting the insulation and voltage resistance performance of the product, improving the product reliability. The above only describes the preferred embodiments of the application and does not limit the application, and those skilled in the art can make usual changes and replacements within the technical solution range of the application, which should be included in the protection range of the application.

Claims

1. A modular oiling device for underwater wet-pluggable electrical connectors, characterized by: The invention comprises a precision oil injector (1), a multifunctional pressing plate (2) and a flange locking module, and is used for realizing the sealing and oiling operation of the jack oil bag and the outer oil bag of the underwater wet plug-in electrical connector, wherein: A precision oil injector (1) is a columnar body made of stainless steel, with a through hole (3) coaxially arranged at its center, an oil injection connection hole (4) coaxial with the through hole (3) opened at the top, and a side hole (5) perpendicular to the axis of the through hole (3) and connected to the through hole (3) to form a connection channel opened at the bottom, so as to achieve communication with the plug-in oil bag and be used for delivering oil to the plug-in oil bag; The multifunctional pressing plate (2) is made of stainless steel and forms a H7 / g6 clearance fit with the precision oil injector (1). The pressing plate (2) is provided with a guide micro-hole (6) coaxially arranged with the oil injection connection hole (4). The central position of the pressing plate (2) is also provided with a central guide hole (7) for connecting the flow channel with the outer oil bag of the wet plug electrical connector, thereby realizing the transportation of oil to the outer oil bag. A flange locking module comprises a fixed flange (8), wherein the lower end surface of the fixed flange (8) is provided with an O-ring groove (9), a composite O-ring (10) is installed in the O-ring groove (9), and the fixed flange (8) is provided with 6 groups of screws (11) arranged in a circular array with the center of the fixed flange (8); the 6 groups of screws (11) are pre-tightened at 60° intervals, and torque control is performed during the pre-tightening process to achieve the fixing of the fixed flange (8) to the multi-function pressure plate (2) and the precision oiler (1); The precision oiler (1), the multifunctional pressing plate (2), the fixing flange (8) and the wet plug electrical connector housing (12) are assembled via screws (11) to form an axial compression chain.

2. The modular oiling device for underwater wet-pluggable electrical connector according to claim 1, characterized in that: The ratio of the diameter of the through hole (3) of the precision oil injector (1) to the diameter of the side hole (5) at the bottom is 1.5-2:1; the central guide hole (7) penetrates the pressure plate (2) at an inclination angle of 15°-25°, and the cross-sectional area of ​​the central guide hole (7) decreases gradually.

3. The modular oiling device for underwater wet-pluggable electrical connector according to claim 1, characterized in that: The main material of the composite O-ring (10) is hydrogenated nitrile rubber or fluororubber, with a hardness of 70±5 Shore A, and is used to achieve sealing between various components; the compression rate of the composite O-ring (10) is set to 18-22%.

4. The modular oil filling device for underwater wet-pluggable electrical connector according to claim 3, characterized in that: The ratio of the depth of the O-ring groove (9) to the cross-sectional diameter of the composite O-ring (10) is 0.6:1-0.8:

1.

5. A vacuum-assisted oiling method for a modular oiling device for underwater wet-pluggable electrical connectors according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Pre-installation of tooling: Immerse the precision oiler (1) and the composite O-ring (10) in silicone oil for 30 seconds, and prepare the oiling device, the equipment required for the oiling process, and the detection equipment at the same time; then place the wet plug electrical connector in a temperature-controllable environment, start the temperature detection module to detect the initial temperature of the wet plug electrical connector, if the initial temperature is less than 28°C, start the heating device to heat the wet plug electrical connector until the temperature of the wet plug electrical connector reaches 30±2°C; if the initial temperature is greater than 32°C, start the cooling device to cool the wet plug electrical connector until the temperature of the wet plug electrical connector reaches 30±2°C; after the temperature of the wet plug electrical connector stabilizes at 30±2°C, perform the assembly operations in sequence: insert the precision oiler (1) into the oil sac in the jack of the wet plug electrical connector to ensure the tightness of the connection between the precision oiler (1) and the oil sac, and detect the precision oiling through the pressure detection module. The initial pressure at the connection between the device (1) and the socket oil bag is lower than 0.1MPa, and the precision oiler (1) needs to be re-inserted until the pressure at the connection reaches 0.1MPa or above; then the pressure plate (2) is sleeved on the precision oiler (1), and the matching clearance between the pressure plate (2) and the precision oiler (1) is checked; then, after installing the composite O-ring (10) in the O-ring groove (9) of the fixed flange (8), the fixed flange (8) is pressed against the pressure plate (2), and finally the 6 sets of screws (11) are tightened in a cross-tightening manner. During the tightening process, the tightening torque of each screw (11) is monitored in real time by a torque sensor. When the torque of each screw (11) reaches the preset minimum torque value and the torque difference between the screws (11) does not exceed 5%, the tightening operation is stopped; after completing the above assembly, silicone oil or transformer oil is filled into the precision oiler (1); S2. Initial oil filling of the oil sac: According to the design parameters of the wet-plug electrical connector, the theoretical oil filling volume of the jack oil bag is calculated, and the oil filling control module is started to fill the jack oil bag with oil. At the same time, the oil filling volume is monitored in real time through the flow metering module. During the oil filling process, the density of the oil is detected by the density detection module every 5 seconds, and the detected density value is compared with the standard density value. If the density value deviation exceeds ±2%, the oil filling is suspended to check whether the oil meets the requirements. If the oil does not meet the requirements, the oil is replaced and the oil filling is restarted. When the oil filling volume reaches 80% of the theoretical oil filling volume, the oil filling speed is reduced to the initial oil filling speed. When the oil filling volume reaches 50% of the theoretical oil filling volume, the oil filling control module issues a stop oil filling command to stop filling the oil sac into the jack; after the oil filling stops, the pressure in the oil sac of the jack is detected by the pressure sensor. If the pressure value exceeds the preset maximum pressure value, the pressure relief valve is activated to release the pressure until the pressure value returns to the normal range; at the same time, the visual inspection module is used to observe whether the oil sac of the jack has overflowed. If overflow has occurred, the overflowed oil volume is recorded, and the oil filling volume is recalculated for supplementary oil filling. After supplementary oil filling, it is detected again whether there is overflow until no overflow occurs; S3. External oil bag pressure perfusion: Start the outer oil bag oil filling system and perform pressure filling into the outer oil bag. The filling pressure is adjusted by the pressure control module. The initial filling pressure is set to 0.1MPa, and then the filling pressure is gradually increased at a rate of 0.05MPa / s. During the filling process, the flow field state of the oil in the outer oil bag is monitored in real time by the flow field detection module. If turbulence is detected in the flow field, the turbulence judgment standard is that the rate of change of the velocity gradient in the flow field exceeds the preset threshold. Then, the filling pressure increase rate is reduced to 0.02MPa / s, and the flow field state is continuously monitored until the turbulence disappears. Then, the filling pressure is increased at a rate of 0.05MPa / s. When the oil starts to flow out from the overflow port, the timing module is started to maintain the current filling pressure for pressure holding, and the pressure holding time is set to 10s. During the pressure holding process, the pressure fluctuation is monitored by the pressure fluctuation detection module. If the pressure fluctuation amplitude exceeds ±0.02MPa, the pressure holding time is extended by 5s and the pressure fluctuation is re-detected until the pressure fluctuation amplitude stabilizes within ±0.02MPa. S4, overall vacuum defoaming: S4-1, rough vacuuming: Place the assembled wet-plug electrical connector and oil filling device into the vacuum chamber, close the vacuum chamber door, start the vacuum pumping device to perform rough vacuum operation, and set the target vacuum degree to 0.05MPa; during the vacuum process, the vacuum degree in the vacuum chamber is monitored in real time by the vacuum detection module, the vacuum degree value is recorded every 30 seconds, and a curve of the vacuum degree change over time is plotted; the actual curve is compared with the preset standard curve. If the deviation between the actual curve and the standard curve is within ±5%, continue vacuuming until the target vacuum degree is reached and maintain it for 2 minutes; if the deviation exceeds ±5%, check the sealing of the vacuum chamber. If there is a leak, repair it, and restart the rough vacuum operation after repair; S4-2, vacuuming for micro-bubble precipitation: After the rough vacuuming stage is completed, the parameters of the vacuum pumping device are adjusted to carry out the vacuuming operation in the microbubble precipitation stage, and the target vacuum degree is set to 0.095MPa. During this stage, the number and size of bubbles in the oil sac are monitored in real time through the bubble detection module, and a bubble distribution report is generated every 1 minute. When the average diameter of the bubbles is less than 5μm and the number growth rate is less than 1 / second, the current vacuum degree is maintained. If the average diameter is greater than 5μm or the number growth rate is greater than 1 / second, the vacuum degree is increased by 0.002MPa and the bubble status is re-checked until the bubble status meets the requirements. After reaching the target vacuum degree, it is maintained for 8 minutes. During the maintenance process, the viscosity of the oil is checked every 2 minutes. If the viscosity change rate exceeds ±3%, the vacuum degree is adjusted to compensate for the viscosity change to ensure that the microbubbles can be smoothly precipitated. S4-3, sustained release to normal pressure: After the microbubble precipitation stage is completed, the pressure in the vacuum chamber is slowly released to normal pressure, and the pressure recovery rate is set to ≤5kPa / s. The pressure recovery rate is precisely controlled by the pressure control module, and the pressure recovery value is detected every 5 seconds. If the actual recovery rate exceeds the set rate, the opening of the intake valve is reduced to slow down the pressure recovery. At the same time, the volume change of the oil bladder is monitored in real time through the volume detection module, and the volume shrinkage rate of the oil bladder is calculated. If the volume shrinkage rate is greater than 0.8%, the pressure recovery is suspended, and the current pressure is maintained for 1 minute before continuing to recover until the volume shrinkage rate is ≤0.8%. After the pressure returns to normal pressure, it is maintained for 5 minutes. During this period, the sealing parts are checked for any abnormalities. If any abnormalities are found, they are treated and the slow release operation is repeated. S5. Environmental adaptability adjustment: During the oil filling and vacuum treatment process, the ambient temperature is monitored in real time through the ambient temperature detection module. If the ambient temperature is greater than 40°C, the high temperature environment adaptation program is initiated: the oil is replaced with low-viscosity silicone oil with a viscosity of 100 cSt. At the same time, temperature compensation is added during the vacuum stage, that is, the vacuum degree increases by 0.005 MPa for every 5°C increase in oil temperature. After the oil is replaced, the various performance parameters of the oil are retested to ensure that they meet the requirements for use in a high temperature environment. If the ambient temperature is ≤40°C, the original oil and vacuum parameters are maintained. S6. Final inspection and judgment: After completing all the above steps, the wet-plug electrical connector after oil filling is fully inspected, including detecting the proportion of bubbles in the oil sac through X-ray imaging. If the bubble residual rate in the oil sac of the socket is less than 0.03% and the bubble residual rate in the outer oil sac is less than 0.05%, the oil filling is judged to be qualified; if the bubble residual rate does not meet the requirements, go to S4 and perform vacuum degassing again until the test is qualified.

6. The vacuum-assisted oiling method for a modular oiling device for underwater wet-pluggable electrical connectors according to claim 5, characterized in that: In the above-mentioned S1, the preset minimum torque value is determined according to the material and size of the fixing flange (8), and the torque difference between each screw (11) is controlled between 3% and 5%.

7. The vacuum-assisted oiling method for a modular oiling device for underwater wet-pluggable electrical connectors according to claim 5, characterized in that: In S2, the calculation of the theoretical oil filling amount takes into account the geometric dimensions of the oil sac of the wet-plug electrical connector jack, the expansion coefficient of the oil, and the influence of the ambient temperature. The expansion coefficient of the oil is in the range of 0.0005-0.0008 / °C to ensure that the reserved 10% expansion space can adapt to the volume changes of the oil at different temperatures.

8. The vacuum-assisted oiling method for a modular oiling device for underwater wet-pluggable electrical connectors according to claim 5, characterized in that: In the above-mentioned S3, the ratio of the initial filling pressure of the outer oil bag to the volume of the outer oil bag of the wet pluggable electrical connector is 0.01 MPa / mL-0.02 MPa / mL.

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