A special explosion-proof quick connector for NPG and an assembling method thereof

Abstract

The present application relates to the technical field of explosion-proof quick connector, and particularly relates to a special NPG explosion-proof quick connector and an assembling method thereof. The quick connector comprises a first connector and a second connector, which are connected with signal cables respectively. A first plug part is connected with the first connector shell through a first plug positioning key, and a second plug part is connected with the second connector shell through a second plug positioning key. The first connector shell and the second connector shell are connectable through a lock nut. The lock nut is internally provided with a clamping screw for fixing the first connector shell, and is further provided with a limiting snap spring at the top. The first connector shell has a positioning pin at one end, and the second connector shell is provided with a positioning hole at one end, which is matched with the shape of the positioning pin, so as to realize the butt joint positioning of the first connector shell and the second connector shell. The assembling method is to align the positioning pin and the positioning hole, rotate the lock nut to insert the plug into the plug hole, and rotate the clamping screw to tightly fix. The quick connector has excellent explosion-proof performance and sealing performance, and the assembling method is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof quick connector, in particular to a NPG special explosion-proof quick connector and an assembling method thereof. BACKGROUND

[0002] In the while-drilling data acquisition system, the negative pulse generator (NPG) is a key component for realizing the downward transmission of mud pulse signals, which is driven by the drilling rig compressed air and communicates with the downhole instrument through the while-drilling data acquisition system. The application scene is a complex environment of the well site drilling operation surface, which is full of flammable and explosive gases, accompanied by corrosion of corrosive medium and high humidity conditions. Therefore, the NPG special explosion-proof quick connector needs to be connected between the NPG and the signal cable, and the connector needs to have good sealing performance, explosion-proof performance and electrical stable connection performance. The traditional cable connector does not have these characteristics.

[0003] Chinese patent publication No. CN104393444B discloses an explosion-proof cable quick connector used in explosive gas conditions, which comprises a quick connector male head connected with an external cable through a cable introduction device and a quick connector female head connected with a device cable in an explosion-proof box through a cable introduction device. Four L-shaped protrusions are uniformly distributed around the quick connector male head, and a plug is installed at the right end of the quick connector male head. The outer diameter of the right end of the quick connector male head cooperates with the inner diameter of the left end of the quick connector female head, and a socket is installed at the left end of the quick connector female head. A slide buckle is sleeved on the right side of the shaft shoulder of the quick connector female head, and a stop buckle is installed at the right end of the slide buckle. The inner holes of the quick connector male head and the quick connector female head are provided with KEVLAR material explosion-proof layers.

[0004] It can be seen that the combination of the slide buckle, the stop buckle and the elastic U-shaped buckle enables the cable to be quickly installed and removed without opening the explosion-proof box during installation, and improves the safety and explosion-proof performance of the connector. However, the following problems still exist: when the above-mentioned connector is used in a vibrating environment, the vibration will cause the slide buckle and the stop buckle to be subjected to continuous impact force and displacement force, and the elastic U-shaped buckle will be continuously stretched and compressed, thereby reducing the elastic performance and affecting the clamping force on the cable, resulting in a decrease in connection stability. SUMMARY

[0005] Therefore, the present application provides a NPG special explosion-proof quick connector and an assembling method thereof to overcome the problem that the existing explosion-proof quick connector cannot maintain a tight connection state after vibration in a flammable and explosive environment, and has poor connection stability.

[0006] To achieve the above-mentioned purpose, on the one hand, the present application provides a NPG special explosion-proof quick connector, which comprises:

[0007] The first connector is internally provided with a first plug part, one end of the first plug part is provided with a plurality of plugs, and the other end of the first plug part is provided with a first plug tail wing fixedly connected with the signal cable.

[0008] The second connector is internally provided with a second plug part, one end of the second plug part is provided with a plurality of plug holes for forming stable electrical connection with the plugs, and the other end of the second plug part is provided with a second plug tail wing.

[0009] The first plug part is connected with the first connector shell through a first plug positioning key, the second plug part is connected with the second connector shell through a second plug positioning key, the surface of the first connector shell away from the signal cable is provided with a threaded structure, and the outer surface of the second connector shell away from the signal cable is provided with a lock nut for realizing stable connection between the first connector shell and the second connector shell.

[0010] The lock nut is internally provided with a locking screw for fixing the first connector shell, and a limit snap spring is further arranged above the lock nut for limiting axial movement of the locking screw.

[0011] The end of the first connector shell away from the signal cable is provided with a positioning pin, and the end of the second connector shell away from the signal cable is provided with a positioning hole matched with the shape of the positioning pin.

[0012] Further, the first connector shell is internally provided with an annular groove near the plug side, and a plug snap spring is embedded in the annular groove for limiting radial displacement of the plug.

[0013] Further, each plug is provided with an insulating sheath, and an insulating sheet matched with the insulating sheath is arranged between the insulating sheath and the first connector shell for electrical insulation.

[0014] Further, a first plug shell is sleeved outside the first plug tail wing of the first plug part, a second plug shell is sleeved outside the second plug tail wing of the second plug part, and an adjusting sleeve is sleeved outside the second plug shell.

[0015] Further, the first connector is fixedly connected with the NPG, a first sealing ring is arranged between the first connector shell and the NPG, a second sealing ring is arranged between the first connector shell and the first plug part, a third sealing ring is arranged between the lock nut and the second connector shell, a fourth sealing ring is arranged between the second connector shell and the second plug part, and a fifth sealing ring is arranged between the second plug shell and the second plug tail wing.

[0016] Further, the heat resistance temperature range of the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring is -40℃ to 70℃.

[0017] Further, a limiting sheet is arranged on one side of the lock nut to limit the axial displacement of the lock nut.

[0018] In another aspect, the application provides an assembling method of the NPG special explosion-proof quick connector, comprising:

[0019] Aligning and positioning the positioning pin of the first connector and the positioning hole of the second connector to connect them;

[0020] Rotating the lock nut on the second connector to axially move the first connector relative to the second connector, and inserting the plug on the first connector into the insertion hole of the second connector;

[0021] Rotating the fastening screw on the second connector to tightly fix the first connector and the second connector;

[0022] After the first connector and the second connector are tightly fixed, environmental vibration of a preset frequency is applied to the explosion-proof quick connector, the vibration acceleration of the explosion-proof quick connector is detected in real time, the real-time contact resistance and the real-time diameter of the positioning pin after each insertion and extraction are detected, the vibration influence coefficient of the vibration on the explosion-proof quick connector is determined according to the real-time diameter and the vibration acceleration, and the electrical safety index of the explosion-proof quick connector is determined according to the vibration influence coefficient and the real-time contact resistance.

[0023] Further, determining the vibration influence coefficient of the vibration on the explosion-proof quick connector comprises:

[0024] The wear amount of each positioning pin is determined according to the initial diameter and the real-time diameter of the positioning pin to determine the wear degree of the positioning pin, and the vibration influence coefficient is determined according to the wear degree and the vibration acceleration.

[0025] Further, determining the electrical safety index of the explosion-proof quick connector comprises:

[0026] The resistance safety coefficient is determined according to the real-time contact resistance and the initial contact resistance, and the electrical safety index is determined according to the resistance safety coefficient and the vibration influence coefficient.

[0027] The electrical safety index is compared with a preset electrical safety index threshold value to determine whether the explosion-proof quick connector meets the assembling standard.

[0028] Further, it further comprises:

[0029] After several assembly operations, the tooth profile height and vibration acceleration of several tooth positions of the threaded structure are detected. The wear degree of the threaded structure is determined based on the tooth profile height and the initial tooth profile height. The safety factor of the explosion-proof quick connector is determined based on the wear degree and vibration acceleration to remind workers to replace the connector.

[0030] Compared with existing technologies, the beneficial effects of this invention are as follows: The NPG-specific explosion-proof connector of this invention includes a first connector and a second connector. The first and second connectors are tightly connected through multiple measures. Specifically, the first and second connectors are accurately positioned by positioning holes and positioning pins, and the locking nut is rotated simultaneously to insert the plug into the socket. After the locking nut is tightened, a set screw is used to prevent loosening. This allows the explosion-proof quick connector to maintain a tight connection under different vibration conditions in flammable and explosive environments, resulting in good connection stability. This further solves the safety problem of explosion-proof connectors in flammable, explosive, and other high-risk environments. Moreover, the explosion-proof connector of this invention can not only be used on drilling instruments such as NPGs, but also in high-risk explosion-proof applications such as the natural gas industry, coal mines, and chemical industries.

[0031] Furthermore, the present invention improves positioning accuracy by using a number of positioning pins on the first connector in a coordinated manner. The asymmetrical but regular distribution of the pins restricts the position of the first connector from multiple angles, which can reduce gaps and swings after connection, and ensure the tightness and accuracy of the connection. This can further solve the safety problem of explosion-proof connectors in flammable, explosive and other high-risk environments.

[0032] Furthermore, the connections between the first and second connectors and the signal cable are all sealed with sealant, providing excellent explosion-proof and sealing performance. Additionally, sealing rings are provided at the connection points of other related components to achieve a sealing function, further ensuring the explosion-proof and sealing performance of the explosion-proof connector in flammable and explosive environments.

[0033] Furthermore, this invention detects the vibration acceleration, real-time contact resistance, and real-time diameter of the locating pin in real time. By quantitatively analyzing these key parameters, it determines the vibration influence coefficient and electrical safety index, thereby achieving dynamic evaluation of the operating status of the explosion-proof quick connector. It issues early warnings before a fault occurs, facilitating timely measures by maintenance personnel to reduce the probability of equipment failure and safety accidents.

[0034] Furthermore, this invention compares the real-time measured tooth profile height with a preset value to determine the wear degree of the thread structure on the first connector, allowing staff to quickly understand the actual wear status of the threads. Then, it comprehensively considers the wear degree and the vibration amplitude of the connector to calculate the safety factor, and dynamically adjusts it according to the actual situation. The safety factor accurately reflects the safety status of the connector under complex working conditions, effectively avoiding safety hazards caused by connector wear or vibration, providing strong technical support for the stable operation of equipment and safe production, and significantly improving the reliability and safety of explosion-proof quick connectors. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the NPG-specific explosion-proof quick connector structure according to an embodiment of the present invention;

[0036] Figure 2 This is a half-sectional view of the first connector according to an embodiment of the present invention;

[0037] Figure 3 This is a view of the end of the first connector according to an embodiment of the present invention;

[0038] Figure 4 This is a half-sectional view of the second connector according to an embodiment of the present invention;

[0039] Figure 5 This is a view of the end of the second connector according to an embodiment of the present invention;

[0040] In the diagram: 1, First connector; 101, Plug; 102, First plug positioning key; 103, First plug housing; 104, Plug snap ring; 105, Insulating sheet; 106, First connector housing; 107, Positioning pin; 2, Second connector; 201, Socket; 202, Second plug positioning key; 203, Second plug housing; 204, Second connector housing; 205, Lock nut; 206, Limit snap ring; 207, Set screw; 208, Limiting piece; 209, Adjusting sleeve; 210, Positioning hole; 3, Negative pulse generator; 4, Signal cable; 5, Cable tie; 6, Rubber sleeve; 7, Sealant; 801, First plug tail wing; 802, Second plug tail wing; 901, First sealing ring; 902, Second sealing ring; 903, Third sealing ring; 904, Fourth sealing ring; 905, Fifth sealing ring. Detailed Implementation

[0041] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0042] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0043] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Please see Figures 1-5 As shown, Figure 1 This is a schematic diagram of the NPG-specific explosion-proof quick connector structure according to an embodiment of the present invention. Figure 2 This is a half-sectional view of the first connector according to an embodiment of the present invention; Figure 3 This is a view of the end of the first connector according to an embodiment of the present invention; Figure 4 This is a half-sectional view of the second connector according to an embodiment of the present invention; Figure 5 This is a view of the end of the second connector according to an embodiment of the present invention.

[0046] Specifically, embodiments of the present invention provide an explosion-proof quick connector for NPG, comprising:

[0047] The first connector 1 has a first plug part inside, one end of the first plug part is provided with a plurality of plugs 101, and the other end of the first plug part is provided with a first plug tail wing 801 that is fixedly connected to the signal cable 4.

[0048] The second connector 2 has a second plug portion inside. One end of the second plug portion has a plurality of sockets 201 for forming a stable electrical connection with the plug 101. The other end of the second plug portion has a second plug tail wing 802.

[0049] The first plug is connected to the first connector housing 106 via the first plug positioning key 102, and the second plug is connected to the second connector housing 204 via the second plug positioning key 202. The surface of the first connector housing 106 away from the signal cable 4 is provided with a threaded structure, and the outer surface of the second connector housing 204 away from the signal cable 4 is fitted with a lock nut 205, so as to achieve a stable connection between the first connector housing 106 and the second connector housing 204.

[0050] The lock nut 205 is provided with a set screw 207 for fixing the first connector housing 106. A limit snap ring 206 is also provided above the lock nut 205 to limit the axial movement of the set screw 207.

[0051] The first connector housing 106 has a positioning pin 107 on the side away from the signal cable 4, and the second connector housing 204 has a positioning hole 210 on the side away from the signal cable 4 that matches the shape of the positioning pin 107.

[0052] Understandably, if the positioning hole 210 and the positioning pin 107 are not aligned, the first plug portion inside the first connector 1 and the second plug portion inside the second connector 2 will not contact each other. During connection, the first connector 1 is inserted into the second connector 2. After the positioning hole 210 and the positioning pin 107 are aligned, the locking nut 205 on the second connector housing 204 is rotated. The locking nut 205 will rotate forward along the threaded structure on the first connector housing 106. As the locking nut 205 rotates, it gradually presses the first connector housing 106 and the second connector housing 204 tightly together, thus achieving a stable connection between them. When disassembly is required, the locking nut 205 is rotated in the opposite direction to disengage it from the threads of the first connector housing 106, thus separating the first connector 1 and the second connector 2.

[0053] In a specific embodiment, preferably, the positioning pin 107 is cuboid in shape, and the positioning hole 210 is rectangular in shape, with the same cross-sectional dimensions as the cuboid. In practice, the positioning pin 107 can be cuboid, or it can be cylindrical, conical, or other shapes, etc., without specific limitations here. Similarly, the shape of the positioning hole 210 is not specifically limited; the main requirement is that the shapes of the positioning pin 107 and the positioning hole 210 are compatible with each other, which will not be elaborated further here.

[0054] This invention relates to an explosion-proof quick connector for NPG applications, comprising a first connector 1 and a second connector 2. The first connector 1 and the second connector 2 are tightly connected through multiple measures. Specifically, the first connector 1 and the second connector 2 are accurately positioned by a positioning hole 210 and a positioning pin 107. Simultaneously, a locking nut 205 is rotated to insert the plug 101 into the socket 201. After the locking nut 205 is tightened, a set screw 207 is used to prevent loosening. This ensures that the explosion-proof quick connector maintains a tight connection under flammable and explosive environments and different vibration conditions, exhibiting good connection stability. This further addresses the safety issues of explosion-proof connectors in flammable, explosive, and other high-risk environments. Furthermore, this invention's explosion-proof quick connector can be used not only on drilling instruments such as NPG systems but also in high-risk explosion-proof applications in the natural gas industry, coal mines, and chemical industries.

[0055] In one specific embodiment, there are five positioning pins 107, one of which (not shown in the figure, hereinafter referred to as the first positioning pin) is positioned above the other positioning pins. The first positioning pin is located on the upper half of the circular cross-section at the end of the first connector housing 106 and lies on the planar geometric center axis. The remaining positioning pins are located on the lower half of the circular cross-section and are unevenly distributed. It is understood that the first positioning pin, located on the upper half of the circular cross-section at the end of the first connector housing 106 and on the planar geometric center axis, provides precise initial guidance when the first connector 1 is connected to the second connector 2, reducing deviations and blind spots during the docking process. The remaining four positioning pins are located on the lower half of the circular cross-section and are evenly distributed along the lower half of the circular cross-section. This arrangement provides stable support for the first connector 1 after connection. When the first connector 1 is inserted into the second connector 2, the five positioning pins work together to ensure that the first connector 1 is subjected to uniform force in the circumferential direction, avoiding localized wear or deformation caused by uneven force, thereby improving the stability and reliability of the connection. Furthermore, under vibration or other external forces, this connection method can effectively prevent the first connector 1 from shifting or shaking.

[0056] This invention improves positioning accuracy by setting a plurality of positioning pins 107 on the first connector 1. The asymmetrical but regular distribution restricts the position of the first connector 1 from multiple angles, which can reduce gaps and swings after connection, ensure tightness and accuracy of connection, and further solve the safety problem of explosion-proof connectors in flammable, explosive and other high-risk environments.

[0057] Specifically, an annular groove is provided inside the first connector housing 106 near the plug 101, and a plug retaining spring 104 is embedded in the annular groove to limit the radial displacement of the plug 101.

[0058] It is understandable that by embedding the plug retainer 104 in the annular groove, the plug 101 is restricted from radial displacement. This prevents the plug 101 from moving radially (perpendicular to the axis of the plug 101) within the first connector housing 106, thus keeping the plug 101 in a relatively fixed position. This ensures the connection accuracy and stability between the plug 101 and other components (such as the second connector 2), and guarantees the normal realization of functions such as signal transmission or mechanical connection.

[0059] Specifically, the first plug housing 103 and the signal cable 4 are covered with a rubber sleeve 6, and the rubber sleeve 6 and the signal cable 4 are fixedly connected by a cable tie 5. The second plug housing 203 and the signal cable 4 are covered with a rubber sleeve 6 at one end, and the rubber sleeve 6 and the signal cable 4 are fixedly connected by a cable tie 5.

[0060] Understandably, the rubber sleeve 6 is usually made of insulating material, which isolates the conductive parts of the first connector 1 and the second connector 2 from the outside environment, preventing electric shock accidents and avoiding short circuits between different lines, thus ensuring the safe and stable operation of the circuit. Furthermore, the rubber sleeve 6 also serves to provide waterproofing, moisture protection, and cushioning and shock absorption.

[0061] Specifically, several of the plugs 101 are covered with an insulating sleeve, and an insulating sheet 105 is provided between the insulating sleeve and the first connector housing 106 to fit the insulating sleeve for electrical insulation.

[0062] Understandably, to ensure electrical safety and meet explosion-proof requirements, the use of insulating sheet 105 and insulating sleeve can achieve electrical insulation between the first connector housing 106 and the plug 101, preventing current from the plug 101 from being conducted through the first connector housing 106, and preventing electrical faults such as leakage and short circuits from causing an explosion hazard. Understandably, the structural shape of the insulating sleeve is not limited here, as long as it can achieve electrical insulation between the first connector housing 106 and the plug 101.

[0063] Specifically, the first plug housing 103 is fitted on the outside of the first plug tail wing 801 of the first plug part, the second plug housing 203 is fitted on the outside of the second plug tail wing 802 of the second plug part, and the adjusting sleeve 209 is fitted on the outside of the second plug housing 203.

[0064] In one specific embodiment, in the first connector 1, the first plug tail wing 801, the first plug housing 103, and the signal cable 4 are fixedly connected by sealant 7. In the second connector 2, the second plug tail wing 802, the second plug housing 203, the adjusting sleeve 209, and the signal cable 4 are fixedly connected by sealant 7. The explosion-proof performance and sealing performance are excellent, and the heat resistance temperature range of sealant 7 is -40℃ to 70℃.

[0065] Specifically, the first connector 1 is fixedly connected to the negative pulse generator 3 (NPG), and a first sealing ring 901 is provided between the first connector housing 106 and the negative pulse generator 3, a second sealing ring 902 is provided between the first connector housing 106 and the first plug part, a third sealing ring 903 is provided between the lock nut 205 and the second connector housing 204, a fourth sealing ring 904 is provided between the second connector housing 204 and the second plug part, and a fifth sealing ring 905 is provided between the second plug protective shell 203 and the second plug tail wing 802.

[0066] Specifically, the heat resistance temperature range of the first sealing ring 901, the second sealing ring 902, the third sealing ring 903, the fourth sealing ring 904, and the fifth sealing ring 905 is all between -40℃ and 70℃.

[0067] Understandably, sealing rings achieve the sealing function between related components. When a sealing ring is installed in a sealing groove and subjected to a certain pressure, it undergoes elastic deformation, filling the gaps between the connected parts and preventing external dust, moisture, liquids, etc., from entering, thus playing a sealing and protective role. Furthermore, in high-temperature, flammable, or explosive environments, sealing materials may lose their sealing effect due to expansion, softening, or deformation. Heat-resistant sealant 7 and sealing rings can maintain stability in high-temperature environments, performing a good sealing function and extending their service life.

[0068] In practice, the sealing ring has a circular cross-section, which has good elasticity and flexibility, and can adapt to sealing surfaces of different shapes and sizes.

[0069] In this invention, the connections between the first connector 1, the second connector 2, and the signal cable 4 are all sealed and fixed using sealant 7, providing excellent explosion-proof and sealing performance. Furthermore, sealing rings are provided at the connection points of other related components to achieve a sealing function, further ensuring the explosion-proof and sealing performance of the explosion-proof connector in flammable and explosive environments.

[0070] Specifically, a limiting piece 208 is provided on one side of the lock nut 205 to limit the axial displacement of the lock nut 205.

[0071] Understandably, the limiting piece 208 can limit the axial displacement of the lock nut 205, thus fixing the lock nut 205 to achieve the correct tightening effect. Furthermore, the limiting piece 208 can also serve as a positioning marker, helping operators quickly determine the initial position or specific rotational position of the lock nut 205, facilitating installation and disassembly operations and improving operational accuracy and efficiency.

[0072] This invention also provides an assembly method for an NPG-specific explosion-proof quick connector, specifically comprising:

[0073] Align and position the positioning pin 107 of the first connector 1 and the positioning hole 210 of the second connector 2.

[0074] Rotate the locking nut 205 on the second connector 2 to move the first connector 1 axially relative to the second connector 2, and insert the plug 101 on the first connector 1 into the socket 201 of the second connector 2;

[0075] Rotate the set screw 207 on the second connector 2 to secure the first connector 1 and the second connector 2 tightly.

[0076] In this process, after the first connector 1 and the second connector 2 are tightened and fixed, an environmental vibration of a preset frequency is applied to the explosion-proof quick connector. The vibration acceleration, real-time contact resistance, and real-time diameter of the positioning pin 107 after each insertion and removal are detected in real time. The vibration influence coefficient of the explosion-proof quick connector is determined based on the real-time diameter and the vibration acceleration, and the electrical safety index of the explosion-proof quick connector is determined based on the vibration influence coefficient and the real-time contact resistance.

[0077] Understandably, the assembly process involves vertically aligning the positioning pin 107 of the first connector 1 with the positioning hole 210 of the second connector 2, pushing it in until the positioning pin 107 and the positioning hole 210 are fully engaged, fixing the first connector 1 on one side, and slowly rotating the lock nut 205 on the other side. As the lock nut 205 rotates, due to the spiral structure of the first connector 1, the threaded drive causes the first connector 1 to move axially into the second connector 2, gradually inserting the plug 101 into the socket 201. After being limited by the limiting piece 208, the set screw 207 is rotated, and the tip of the set screw 207 presses against the outer wall of the first connector 1, forming an anti-loosening lock. At this point, the first connector 1 and the second connector 2 are tightly fixed. Through these steps, a safe and reliable mechanical and electrical connection between the first connector 1 and the second connector 2 can be ensured.

[0078] It is understandable that the connector is located in a flammable and explosive environment. Excessive environmental vibration can lead to mechanical fatigue and loosening. Wear of the locating pin 107 and significant external vibration can affect the alignment accuracy and contact stability of the connector. For example, vibration can increase the wear of the locating pin 107, reducing the actual contact area between the locating hole 210 and the locating pin 107. Contact resistance is inversely proportional to contact area. Simultaneously, the metal particles and oxide layer generated during wear increase the roughness of the contact surface, leading to a non-linear increase in contact resistance. Increased resistance results in heat generation and increased energy consumption, affecting electrical connection performance. Since the explosion-proof quick connector involves multiple insertions and removals during assembly and use, wear will occur due to environmental vibrations and repeated insertions and removals. Therefore, the electrical safety index of the explosion-proof quick connector is determined based on the vibration influence coefficient on the wear of the locating pin 107 and the real-time contact resistance.

[0079] In one specific embodiment, after the first connector 1 and the second connector 2 are tightened and fixed, an environmental vibration of a preset frequency is applied to the explosion-proof quick connector. The preset frequency ranges from 30Hz to 100Hz, and preferably, the preset frequency is 65Hz. In practice, the range and preferred value of the preset frequency can be determined according to the actual situation, and are not specifically limited here, nor will they be elaborated further.

[0080] Specifically, the vibration influence parameters of the explosion-proof quick connector are determined, the wear amount of each positioning pin 107 is determined based on the initial diameter and real-time diameter of the positioning pin 107 to determine the degree of positioning pin wear, and the vibration influence coefficient is determined based on the degree of wear and the vibration acceleration.

[0081] In one specific embodiment, the wear amount of each positioning pin 107 = initial diameter - real-time diameter, and the degree of wear of the positioning pin = the average of the total wear amounts of each positioning pin / initial diameter. The explosion-proof quick connector can be externally connected to an acceleration sensor to characterize the vibration acceleration of the explosion-proof quick connector by the vibration intensity of the working environment, or by acquiring a working image of the explosion-proof quick connector and performing kinematic calculations on the image to obtain the vibration acceleration of the explosion-proof quick connector. The detection position can be set near the interface connection between the first connector 1 and the second connector 2. The vibration influence coefficient K is calculated using the following formula:

[0082]

[0083] The vibration acceleration threshold value ranges from 0.5 to 1 m / s². 2 Preferably, the threshold value of the vibration acceleration is 0.7 m / s². 2 .

[0084] Specifically, determining the electrical safety index of explosion-proof quick couplings includes:

[0085] The resistance safety factor is determined based on the real-time contact resistance and the initial contact resistance, and the electrical safety index is determined based on the resistance safety factor and the vibration influence factor.

[0086] Based on the comparison between the electrical safety index and the preset electrical safety index threshold, it is determined whether the explosion-proof quick connector meets the assembly standards.

[0087] In one specific embodiment, the resistance safety factor = real-time contact resistance / initial contact resistance, and the electrical safety index S is calculated using the following formula:

[0088]

[0089] Where α is used to quantify the weight of the impact of vibration and wear on electrical performance, with a value of 0.4; β is used to quantify the degree of deterioration of the electrical factors themselves, with a value of 0.6; and K is the vibration influence coefficient. This refers to the resistance safety factor. It can be understood that the initial contact resistance is the data obtained from the first contact resistance test of the explosion-proof quick connector, while the real-time contact resistance is the data obtained from the current contact resistance test of the explosion-proof quick connector.

[0090] In one specific embodiment, if the electrical safety index is less than the preset electrical safety index threshold, then the explosion-proof quick connector does not meet the assembly standard;

[0091] If the electrical safety index is greater than or equal to the preset electrical safety index threshold, the explosion-proof quick connector meets the assembly standard. The preset electrical safety index threshold ranges from 0.7 to 0.85, and preferably, it is 0.78. In practice, the range and preferred value of the preset electrical safety index threshold can be determined according to the actual situation, and are not specifically limited here, nor will they be elaborated further.

[0092] This invention monitors the vibration acceleration, contact resistance, and locating pin 107 of the connector in real time. By quantitatively analyzing these key parameters, it determines the vibration influence coefficient and electrical safety index, enabling dynamic assessment of the explosion-proof quick connector's operating status. When the electrical safety index exceeds a preset threshold, it is determined that the explosion-proof quick connector poses an electrical safety risk and does not meet assembly standards. An early warning is issued before a fault occurs, allowing maintenance personnel to take timely measures and reduce the probability of equipment failure and safety accidents. When the electrical safety index is less than or equal to the preset threshold, it is determined that the explosion-proof quick connector does not pose an electrical safety risk and meets assembly standards, thus completing the assembly of the explosion-proof quick connector.

[0093] Specifically, the tooth profile height and vibration acceleration of several tooth positions of the thread structure can be detected periodically. The wear degree of the thread structure can be determined based on the tooth profile height and the initial tooth profile height. The safety factor of the explosion-proof quick connector can be determined based on the wear degree and vibration acceleration to remind workers to replace the connector.

[0094] Understandably, selecting several thread positions to measure the thread profile height during the use of the connector can more comprehensively reflect the overall thread wear and avoid errors caused by single-point measurements. Monitoring the vibration amplitude of the connector can promptly capture dynamic changes in the connector's working environment. By comparing the detected thread profile height with the initial thread profile height, the degree of thread wear can be clearly identified, allowing for a direct and accurate assessment of the thread wear condition. The vibration amplitude reflects the severity of the working environment of the rapid explosion-proof connector. Combining the vibration amplitude and the thread wear condition allows for a comprehensive evaluation of the connector's safety and reliability under current operating conditions, using the safety factor as a quantitative indicator.

[0095] In one specific embodiment, the tightening force of the set screw 207 is limited to the point that the set screw 207 is in complete contact with the first connector 1 without stripping the threads, and after tightening is completed, the first connector 1 and the second connector 2 can be gently pulled to confirm that there is no axial looseness.

[0096] In another specific embodiment, the initial tooth profile height ranges from 0.8 to 1.4 mm, and preferably, the initial tooth profile height is 1 mm. In practice, the range and preferred value of the initial tooth profile height can be determined according to actual conditions, and are not specifically limited here, nor will they be elaborated further.

[0097] Specifically, the amount of tooth wear is determined based on the current tooth profile height of the explosion-proof quick connector and the initial tooth profile height, and the degree of wear is determined based on several tooth wear amounts.

[0098] Because explosion-proof quick couplings are designed for rapid assembly and disassembly, they may experience wear after several assembly cycles, which could affect the electrical performance and safety of the assembled coupling. Therefore, the tooth profile height of the current explosion-proof quick coupling before the current assembly can be tested to determine the degree of wear.

[0099] In one specific embodiment, the tooth wear amount = initial tooth profile height - tooth profile height. n is the total number of tooth positions.

[0100] Specifically, the vibration wear coefficient is determined based on the wear level and the vibration amplitude of the joint, and the safety factor is determined based on the vibration wear coefficient.

[0101] Specifically, the timing of the reminder is determined based on the comparison between the safety factor and the safety threshold. If the safety factor is lower than the safety threshold, it is determined that there is an assembly risk in the explosion-proof quick connector, and the reminder is triggered. If the safety factor is greater than or equal to the safety threshold, the assembly risk reminder is not triggered.

[0102] Understandably, the wear level is a quantitative indicator of the surface wear of the threaded structure of the first connector 1 after being affected by vibration in a flammable and explosive environment and after several assembly and disassembly processes. The connector vibration amplitude is the range of vibration detected during several historical operations of the quick-connect explosion-proof connector in a flammable and explosive environment. By establishing the relationship between the wear level, the connector vibration amplitude, and the vibration wear coefficient, the vibration wear coefficient, i.e., the influence of vibration on the wear level of the threaded structure, can be determined. The safety factor is a quantitative indicator that the threaded structure will not loosen due to vibration and can maintain a tight connection under a certain wear level.

[0103] In one specific embodiment, the obtained wear degree and joint vibration amplitude are normalized to [0, 1], and the vibration wear coefficient = wear weight × wear degree + amplitude weight × joint vibration amplitude. Flammable and explosive environments have a significant impact on the vibration amplitude of the joint, which indirectly affects the degree of wear. Therefore, the amplitude weight is greater than the wear weight. Preferably, the wear weight is 0.3, the amplitude weight is 0.7, and the sum of the wear weight and the amplitude weight is 1. Since a dedicated signal cable is required for transmission between the NPG and the drilling data acquisition system, and the operating environment is a complex environment such as flammable, explosive, corrosive, or high-humidity well sites, the environmental severity coefficient is negatively correlated with the safety factor. The environmental severity coefficient is in the range of [0, 1], and the environmental severity index is a weighted sum of various environmental types. Different environmental types have different weights. In flammable and explosive environments, environmental types can include flammable and explosive environments, high-humidity environments, and corrosive environments, with a maximum total weight of 1. The corresponding maximum weights are 0.5, 0.25, and 0.25, respectively. Preferably, in this scenario, the environmental severity coefficient is 0.8, and the safety threshold ranges from 0.7 to 1. Preferably, the safety threshold is 0.85. In practice, the range and preferred values ​​of the weights of different environmental types in the insurance threshold and environmental severity coefficient can be determined according to the actual situation. No specific limitations are made here, and they will not be elaborated further.

[0104] This invention compares the real-time measured thread height with a preset value to determine the wear level of the thread structure on the first connector 1, allowing staff to quickly understand the actual wear status of the thread. Then, it comprehensively considers the wear level and the vibration amplitude of the connector to calculate the safety factor, and dynamically adjusts it according to the actual situation. The safety factor accurately reflects the safety status of the connector under complex working conditions, effectively avoiding safety hazards caused by connector wear or vibration, providing strong technical support for the stable operation of equipment and safe production, and significantly improving the reliability and safety of explosion-proof quick connectors.

[0105] In one specific embodiment, the preset electrical safety index threshold can also be adjusted by the safety factor of the explosion-proof quick connector.

[0106] Specifically, after calculating the safety factor of the explosion-proof quick connector, if the safety factor is greater than or equal to the safety threshold, the safety threshold is compared with the safety factor to obtain the safety ratio (≤1). The safety ratio is used as an adjustment factor for the preset electrical safety index threshold to calculate the preset electrical safety index threshold.

[0107] In implementation, the safety factor and the safety ratio are inversely proportional. A larger safety factor results in a smaller safety ratio, indicating higher physical connection stability of the explosion-proof quick connector. This allows it to withstand relatively higher electrical risks to a certain extent, thus lowering the electrical safety index threshold standard and allowing more explosion-proof quick connectors to be deemed qualified. Therefore, the corresponding preset electrical safety index threshold should be lower. Thus, the preset electrical safety index threshold is adjusted based on the safety factor. The preset electrical safety index threshold = safety ratio × basic electrical safety index threshold.

[0108] The basic electrical safety index threshold is set as the minimum value of the electrical safety index calculated from the corresponding data of several explosion-proof quick connectors whose electrical performance is qualified after 1000 insertions and removals. Alternatively, the value can be determined according to the actual scenario, and is not limited here.

[0109] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for assembling an NPG-specific explosion-proof quick connector, characterized in that, NPG-specific explosion-proof quick connectors include: The first connector has a first plug portion inside, one end of the first plug portion is provided with several plugs, and the other end of the first plug portion is provided with a first plug tail wing that is fixedly connected to the signal cable. The second connector has a second plug part inside. One end of the second plug part has several holes for forming a stable electrical connection with the plug. The other end of the second plug part has a second plug tail wing. The first plug is connected to the first connector housing via a first plug positioning key, and the second plug is connected to the second connector housing via a second plug positioning key. The surface of the first connector housing away from the signal cable is provided with a threaded structure, and the outer surface of the second connector housing away from the signal cable is fitted with a lock nut to achieve a stable connection between the first connector housing and the second connector housing. The lock nut is provided with a set screw for fixing the first connector housing, and a limit snap ring is provided above the lock nut to limit the axial movement of the set screw; The first connector housing has a positioning pin at the end away from the signal cable, and the second connector housing has a positioning hole at the end away from the signal cable that matches the shape of the positioning pin. The assembly method includes: Align the positioning pin of the first connector with the positioning hole of the second connector and connect them for positioning. Rotate the locking nut on the second connector to move the first connector axially relative to the second connector, and insert the plug on the first connector into the socket of the second connector; Rotate the set screw on the second connector to secure the first connector and the second connector tightly. The process includes: after the first and second connectors are tightened and fixed, an environmental vibration of a preset frequency is applied to the explosion-proof quick connector; the vibration acceleration, real-time contact resistance, and real-time diameter of the positioning pin after each insertion and removal are detected in real time; the vibration influence coefficient of the explosion-proof quick connector is determined based on the real-time diameter and the vibration acceleration; and the electrical safety index of the explosion-proof quick connector is determined based on the vibration influence coefficient and the real-time contact resistance. The process also includes: after several assembly operations, detecting the tooth profile height and vibration acceleration of several tooth positions of the thread structure; determining the wear degree of the thread structure based on the tooth profile height and the initial tooth profile height; and determining the safety factor of the explosion-proof quick connector to remind workers to replace the connector. The determination of the vibration influence coefficient on the explosion-proof quick connector includes: The wear amount of each positioning pin is determined based on the initial diameter and the real-time diameter of the positioning pin to determine the degree of wear of the positioning pin, and the vibration influence coefficient is determined based on the degree of wear and the vibration acceleration. Determine the electrical safety index of explosion-proof quick couplings, including: The resistance safety factor is determined based on the real-time contact resistance and the initial contact resistance, and the electrical safety index is determined based on the resistance safety factor and the vibration influence factor. Based on a comparison between the electrical safety index and a preset electrical safety index threshold, it is determined whether the explosion-proof quick connector meets the assembly standards. If the electrical safety index is less than the preset electrical safety index threshold, then the explosion-proof quick connector does not meet the assembly standard; The vibration wear coefficient is determined based on the wear degree and the vibration amplitude of the joint, and the environmental severity coefficient is in the range of [0, 1].

2. The assembly method of the NPG-specific explosion-proof quick connector according to claim 1, characterized in that, An annular groove is provided inside the first connector housing near the plug side, and a plug retaining spring is embedded in the annular groove to limit the radial displacement of the plug.

3. The assembly method of the NPG-specific explosion-proof quick connector according to claim 2, characterized in that, Each of the plugs is provided with an insulating sleeve, and an insulating sheet is provided between the insulating sleeve and the first connector shell to fit the insulating sleeve for electrical insulation.

4. The assembly method of the NPG-specific explosion-proof quick connector according to claim 1, characterized in that, The first plug housing is fitted onto the outside of the first plug tail wing of the first plug portion, the second plug housing is fitted onto the outside of the second plug tail wing of the second plug portion, and the adjustment sleeve is fitted onto the outside of the second plug housing.

5. The assembly method of the NPG-specific explosion-proof quick connector according to claim 4, characterized in that, The first connector is fixedly connected to the NPG, and a first sealing ring is provided between the first connector housing and the NPG. A second sealing ring is provided between the first connector housing and the first plug portion. A third sealing ring is provided between the lock nut and the second connector housing. A fourth sealing ring is provided between the second connector housing and the second plug portion. A fifth sealing ring is provided between the second plug sheath and the second plug tail wing.

6. The assembly method of the NPG-specific explosion-proof quick connector according to claim 5, characterized in that, The heat resistance temperature range of the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring, and the fifth sealing ring is all between -40℃ and 70℃.

7. The assembly method of the NPG-specific explosion-proof quick connector according to claim 5, characterized in that, A limiting piece is provided on one side of the lock nut, and the limiting piece is sleeved on the second joint to limit the axial displacement of the lock nut.

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