Special anti-explosion quick connector for NPG and assembling method thereof

Abstract

The invention relates to the technical field of anti-explosion quick connectors, in particular to an anti-explosion quick connector special for an NPG and an assembling method thereof.The quick connector comprises a first connector body and a second connector body which are connected with a signal cable, and a first plug part is connected with a 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, and the first connector shell and the second connector shell can be connected through a lock nut. A fastening screw for fixing the first connector shell is arranged in the lock nut, and a limiting clamp spring is further arranged above the lock nut. A positioning pin is arranged at one end of the first connector shell, and a positioning hole matched with the positioning pin in shape is formed in one end of the second connector shell and used for achieving butt joint positioning of the first connector shell and the second connector shell. The assembling method comprises the steps of aligning and connecting the positioning pin and the positioning hole, rotating the lock nut to enable the plug to be inserted into the jack, and rotating the fastening screw for tight fixation. The quick connector is excellent in explosive-proof performance and sealing performance and simple in assembly mode.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof quick connectors, and in particular to an NPG-specific explosion-proof quick connector and an assembling method thereof. Background Art

[0002] In the data acquisition while drilling system, the negative pulse generator (NPG) is a key component for transmitting mud pulse signals. It is driven by compressed air from the drilling rig and communicates with downhole instruments with the help of the data acquisition while drilling system. Its application scenario is the complex environment of the well site drilling operation surface filled with flammable and explosive gases, accompanied by corrosive media corrosion and high humidity conditions. Therefore, it is necessary to connect an NPG special explosion-proof quick connector between the NPG and the signal cable. The connector must have good sealing, explosion-proof performance and electrical stable connection performance. Traditional cable connectors do not have these characteristics.

[0003] Chinese patent publication number: CN104393444B discloses an explosion-proof cable quick connector for use under explosive gas conditions. It includes a quick-connect male connector connected to an external cable through a cable entry device and a quick-connect female connector connected to the equipment cable in the explosion-proof box through the cable entry device. The quick-connect male connector has four L-shaped protrusions distributed around its body, and the plug is installed at the right end of the quick-connect male connector. The outer diameter of the right end of the quick-connect male connector matches the inner diameter of the left end of the quick-connect female connector, and the socket is installed at the left end of the quick-connect female connector. A sliding buckle is mounted on the right side of the quick-connect female connector's shaft shoulder, and a retaining buckle is installed on the right end of the sliding buckle. The inner holes of both the quick-connect male connector and the quick-connect female connector are provided with an explosion-proof layer of KEVLAR material.

[0004] As can be seen, the above technical solution uses a combination of a slide buckle, a retaining buckle, and an elastic U-shaped clip, allowing for quick cable installation and removal without opening the explosion-proof box, and improving the safety and explosion-proof performance of the connector. However, the following problems still exist: when the above connector is used in an environment with high vibration, the vibration will cause the slide buckle and retaining buckle to be subjected to continuous impact and displacement forces, making it impossible to maintain a tight connection. At the same time, the elastic U-shaped clip will be continuously stretched and compressed, reducing its elasticity, which in turn affects the clamping force on the cable and reduces the connection stability. Summary of the Invention

[0005] To this end, the present invention provides an NPG-specific explosion-proof quick connector and an assembly method thereof, so as to overcome the problem in the prior art that the 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 objectives, the present invention provides, on the one hand, a NPG-specific explosion-proof quick connector, comprising:

[0007] A first connector, wherein a first plug portion is provided inside, a plurality of plugs are provided at one end of the first plug portion, and a first plug tail fixedly connected to the signal cable is provided at the other end of the first plug portion;

[0008] A second connector, wherein a second plug portion is provided inside the connector, a plurality of jacks are provided at one end of the second plug portion for forming a stable electrical connection with the plug, and a second plug tail is provided at the other end of the second plug portion;

[0009] The first plug portion is connected to the first connector housing via a first plug positioning key, and the second plug portion is connected to the second connector housing via a second plug positioning key. A threaded structure is provided on the surface of the first connector housing on the side away from the signal cable, and a lock nut is provided on the outer surface of the second connector housing on the side away from the signal cable to achieve a stable connection between the first connector housing and the second connector housing.

[0010] A set screw for fixing the first joint housing is provided inside the lock nut, and a limit spring is provided above the lock nut for limiting axial movement of the set screw;

[0011] A positioning pin is provided at the end of the first connector housing away from the signal cable, and a positioning hole matching the shape of the positioning pin is provided at the end of the second connector housing away from the signal cable.

[0012] Furthermore, an annular groove is provided inside the first connector housing on one side close to the plug, and a plug retaining spring is embedded in the annular groove to limit radial displacement of the plug.

[0013] Furthermore, each plug outer shell is provided with an insulating sheath, and an insulating sheet in contact with the insulating sheath is provided between the insulating sheath and the first connector shell for electrical insulation.

[0014] Furthermore, the first plug protective shell is arranged on the outside of the first plug tail wing of the first plug part, the second plug protective shell is arranged on the outside of the second plug tail wing of the second plug part, and the adjustment sleeve is arranged on the outside of the second plug protective shell.

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

[0016] Furthermore, the heat-resistant 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°C to 70°C.

[0017] Furthermore, a limit plate is provided on one side of the lock nut to limit the axial displacement of the lock nut.

[0018] In another aspect, the present invention provides an assembly method using a special NPG explosion-proof quick connector, comprising:

[0019] Align the positioning pin of the first connector with the positioning hole of the second connector for positioning connection;

[0020] Rotate the lock 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;

[0021] Rotate the set screw on the second joint to tightly fix the first joint and the second joint;

[0022] After the first connector and the second connector are tightened and fixed, environmental vibration of a preset frequency is applied to the explosion-proof quick connector, and the vibration acceleration, real-time contact resistance and real-time diameter of the positioning pin after each plugging and unplugging of the explosion-proof quick connector 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.

[0023] Furthermore, the vibration influence coefficient of the explosion-proof quick connector is determined to include:

[0024] The wear amount of each positioning pin is determined according to the initial diameter of the positioning pin and the real-time diameter 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] Furthermore, the electrical safety index of explosion-proof quick connectors is determined to include:

[0026] Determine a resistance safety factor according to the real-time contact resistance and the initial contact resistance, and determine an electrical safety index according to the resistance safety factor and the vibration influence factor;

[0027] Based on the 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 standard.

[0028] Furthermore, it also includes:

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

[0030] Compared with the prior art, the beneficial effect of the present invention is that the NPG-specific explosion-proof joint of the present invention includes a first joint and a second joint, and the first joint and the second joint are tightly connected through multiple measures, wherein the first joint and the second joint are accurately docked and positioned through positioning holes and positioning pins, and the lock nut is rotated at the same time to allow the plug to be inserted into the socket. After the lock nut is tightened, a set screw is used to prevent loosening. This allows the explosion-proof quick connector to maintain a tightly connected state under different vibration conditions in flammable and explosive environments, and has good connection stability, which can further solve the safety problem of explosion-proof joints in flammable, explosive and other high-risk environments. In addition, the explosion-proof joint of the present invention can be used not only on drilling instruments such as NPG, but also in high-risk explosion-proof requirements in the natural gas industry, coal mines, chemical industry and other high-risk industries.

[0031] Furthermore, the present invention improves the positioning accuracy through the joint action of several positioning pins on the first joint, adopts an asymmetric but regular distribution method, limits the position of the first joint from multiple angles, reduces the gap and swing after connection, ensures the tightness and accuracy of the connection, and further solves the safety problems of explosion-proof joints in flammable, explosive and other high-risk environments.

[0032] Furthermore, the connections between the first and second connectors and the signal cable are sealed with sealant, resulting in excellent explosion-proof and sealing performance. Seal rings are also provided at the connections of other related components to further enhance the explosion-proof and sealing performance of the explosion-proof connector in flammable and explosive environments.

[0033] Furthermore, the present invention detects the vibration acceleration, real-time contact resistance and real-time diameter of the joint in real time, determines the vibration influence coefficient and electrical safety index by quantitatively analyzing these key parameters, realizes dynamic evaluation of the operating status of the explosion-proof quick joint, and issues an early warning before a fault occurs, so that maintenance personnel can take timely measures and reduce the probability of equipment failure and safety accidents.

[0034] Furthermore, the present invention compares the real-time measured thread profile height with a preset value to determine the degree of wear of the thread structure on the first joint, which facilitates the staff to quickly understand the actual wear condition of the thread, and then comprehensively considers the degree of wear and the vibration amplitude of the joint to calculate the safety coefficient, and dynamically adjusts it according to the actual situation. The safety status of the joint under complex working conditions is accurately reflected through the safety coefficient, which effectively avoids safety hazards caused by joint wear or vibration, provides strong technical guarantees for the stable operation and safe production of the equipment, and significantly improves the reliability and safety of the use of explosion-proof quick joints. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0038] Figure 4 A half-section view of a second joint according to an embodiment of the present invention;

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

[0040] In the figure: 1, first connector; 101, plug; 102, first plug positioning key; 103, first plug shell; 104, plug retaining spring; 105, insulating sheet; 106, first connector shell; 107, positioning pin; 2, second connector; 201, jack; 202, second plug positioning key; 203, second plug shell; 204, second connector shell; 205, lock nut; 206, limiting retaining spring; 207, fastening screw; 208, limiting sheet; 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 DESCRIPTION

[0041] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain 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 the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating 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 does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] See also Figures 1 to 5 As shown, Figure 1 This is a schematic diagram of the structure of the NPG special explosion-proof quick connector according to an embodiment of the present invention. Figure 2 This is a half-section view of the first joint according to an embodiment of the present invention; Figure 3 This is an end view of the first joint according to an embodiment of the present invention; Figure 4 A half-section view of a second joint according to an embodiment of the present invention; Figure 5 This is a view of the end portion of the second joint according to an embodiment of the present invention.

[0046] Specifically, an embodiment of the present invention provides an NPG-specific explosion-proof quick connector, comprising:

[0047] The first connector 1 has a first plug portion disposed therein, one end of which is provided with a plurality of plugs 101, and the other end of which is provided with a first plug tail 801 fixedly connected to the signal cable 4;

[0048] The second connector 2 has a second plug portion disposed therein. One end of the second plug portion is provided with a plurality of jacks 201 for forming a stable electrical connection with the plug 101. The other end of the second plug portion is provided with a second plug tail 802.

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

[0050] A set screw 207 is provided inside the lock nut 205 to fix the first joint housing 106. A limit spring 206 is also provided above the lock nut 205 to limit the axial movement of the set screw 207.

[0051] A positioning pin 107 is provided at the end of the first connector housing 106 away from the signal cable 4 , and a positioning hole 210 whose shape matches that of the positioning pin 107 is provided at the end of the second connector housing 204 away from the signal cable 4 .

[0052] It is understood that if the positioning hole 210 and the positioning pin 107 are not aligned, the first plug portion in the first connector 1 and the second plug portion in the second connector 2 will not contact each other. During connection, the first connector 1 is inserted into the second connector 2, and after the positioning hole 210 and the positioning pin 107 are aligned, the lock nut 205 on the second connector housing 204 is rotated. The lock nut 205 rotates and advances along the threaded structure on the first connector housing 106. As the lock nut 205 rotates, it gradually squeezes the first connector housing 106 and the second connector housing 204 tightly together, thereby achieving a stable connection between the two. When disassembly is required, the lock nut 205 is rotated in the opposite direction to remove it from the threads of the first connector housing 106, thereby separating the first connector 1 and the second connector 2.

[0053] In a specific embodiment, preferably, the positioning pin 107 is in the shape of a cuboid, and the positioning hole 210 is in the shape of a rectangle, with the same cross-sectional dimensions as the cuboid. In practice, the positioning pin 107 can be in a variety of shapes, including a cylindrical pin, a conical pin, etc., in addition to being a cuboid, and no specific limitations are set here. The shape of the positioning hole 210 is also not specifically limited. The main point is that the shapes of the positioning pin 107 and the positioning hole 210 are compatible with each other, and no further details are given here.

[0054] The NPG-specific explosion-proof quick connector of the present invention includes a first connector 1 and a second connector 2, which are tightly connected through multiple measures. The first connector 1 and the second connector 2 are accurately docked and positioned through a positioning hole 210 and a positioning pin 107, and the lock nut 205 is simultaneously rotated to allow the plug 101 to be inserted into the socket 201. After the lock nut 205 is tightened, a set screw 207 is used to prevent loosening. This allows the explosion-proof quick connector to maintain a tightly connected state under different vibration conditions in flammable and explosive environments, and has good connection stability, which can further solve the safety issues of explosion-proof connectors in flammable, explosive and other high-risk environments. In addition, the explosion-proof quick connector of the present invention can be used not only on drilling instruments such as NPG, but also in high-risk explosion-proof requirements in the natural gas industry, coal mines, chemical industry, and other high-risk industries.

[0055] In one specific embodiment, there are five locating pins 107, one of which (not shown, hereinafter referred to as the first locating pin) is positioned above the remaining locating pins. The first locating pin is located in the upper half of the circular cross-section where the end of the first connector housing 106 is located, and is on the plane's geometric center axis. The remaining locating pins are unevenly distributed in the lower half of the circular cross-section. It is understood that the first locating pin, located in the upper half of the circular cross-section where the end of the first connector housing 106 is located, and is on the plane's geometric center axis, provides precise initial guidance when connecting the first connector 1 and the second connector 2, reducing deviation and blindness during the docking process. The remaining four locating pins are located in the lower half of the circular cross-section and are evenly and equidistantly distributed along the lower half of the circular cross-section. This layout provides stable support for the first connector 1 after connection. When the first connector 1 is inserted into the second connector 2, the five locating pins work together to evenly distribute force on the first connector 1 in the circumferential direction, avoiding local wear or deformation caused by uneven force, thereby improving the stability and reliability of the connection. Furthermore, this connection method effectively prevents the first connector 1 from shifting or shaking under vibration or other external forces.

[0056] The present invention improves the positioning accuracy by arranging a plurality of positioning pins 107 on the first joint 1, and adopts an asymmetric but regular distribution method to limit the position of the first joint 1 from multiple angles, which can reduce the gap and swing after connection, ensure the tightness and accuracy of the connection, and further solve the safety problem of explosion-proof joints in high-risk environments such as flammable and explosive 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 radial displacement of the plug 101 .

[0058] It can be understood that by embedding the plug retaining spring 104 in the annular groove, the radial displacement of the plug 101 is limited, thereby preventing the plug 101 from moving radially (perpendicular to the axis of the plug 101) in the first connector housing 106, so that the plug 101 can be maintained in a relatively fixed position, thereby ensuring the connection accuracy and stability between the plug 101 and other components (such as the second connector 2, etc.), and ensuring the normal realization of functions such as signal transmission or mechanical connection.

[0059] Specifically, a rubber sleeve 6 is provided on the outside of the first plug protective shell 103 and the signal cable 4, and the rubber sleeve 6 and the signal cable 4 are fixedly connected with a cable tie 5. A rubber sleeve 6 is provided on the outside of the second plug protective shell 203 and one end of the signal cable 4, and the rubber sleeve 6 and the signal cable 4 are fixedly connected with a cable tie 5.

[0060] It is understood that the rubber sleeve 6 is typically made of an insulating material and can isolate the conductive portions of the first connector 1 and the second connector 2 from the outside world, preventing electric shock accidents and short circuits between different lines, thereby ensuring safe and stable operation of the circuit. The rubber sleeve 6 can also provide waterproofing, moisture-proofing, and shock absorption.

[0061] Specifically, several of the plugs 101 are provided with insulating sheaths on their outer covers, and an insulating sheet 105 in contact with the insulating sheaths is provided between the insulating sheaths and the first connector housing 106 for electrical insulation.

[0062] As will be appreciated, to ensure electrical safety and meet explosion-proof requirements, the insulating sheet 105 and insulating sheath provide electrical insulation between the first connector housing 106 and the plug 101. This prevents current from the plug 101 from being conducted through the first connector housing 106, thus preventing electrical faults such as leakage and short circuits from causing explosion hazards. It will be appreciated that the structural shape of the insulating sheath is not limited herein, as long as it provides electrical insulation between the first connector housing 106 and the plug 101.

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

[0064] In a specific embodiment, in the first connector 1, the first plug tail wing 801, the first plug protective shell 103 and the signal cable 4 are fixedly connected by the sealant 7, and in the second connector 2, the second plug tail wing 802, the second plug protective shell 203, the adjustment sleeve 209 and the signal cable 4 are fixedly connected by the sealant 7, with excellent explosion-proof performance and sealing performance, and the heat-resistant temperature range of the sealant 7 is -40°C to 70°C.

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

[0066] Specifically, the heat-resistant 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 -40°C to 70°C.

[0067] It is understood that the sealing ring can achieve a sealing function between the relevant components. When the sealing ring is installed in the sealing groove and subjected to a certain pressure, it undergoes elastic deformation, filling the gap between the interconnected parts, preventing the ingress of external dust, moisture, liquids, etc., and thus providing a sealing and protective effect. In high-temperature and flammable and explosive environments, the sealing material may lose its sealing effect due to expansion, softening, or deformation. The heat-resistant sealant 7 and the sealing ring can maintain stability in high-temperature environments, provide a good sealing effect, and extend the service life.

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

[0069] The connections between the first and second connectors 1, 2, and the signal cable 4 are sealed and secured with sealant 7, resulting in excellent explosion-proof and sealing performance. Sealing rings are also provided at the connections of other related components to further enhance the explosion-proof and sealing performance of the explosion-proof connector in flammable and explosive environments.

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

[0071] It is understood that the stopper 208 can limit the axial displacement of the lock nut 205 and fix the lock nut 205 to achieve a correct tightening effect. In addition, the stopper 208 can also serve as a positioning mark to help the operator quickly determine the initial position or specific rotational position of the lock nut 205, facilitating installation and removal operations and improving the accuracy and efficiency of operations.

[0072] The embodiment of the present invention further provides an assembly method of an NPG-specific explosion-proof quick connector, specifically comprising:

[0073] Align the positioning pin 107 of the first connector 1 with the positioning hole 210 of the second connector 2 for positioning and connection;

[0074] Rotate the lock 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 joint 2 to tightly fix the first joint 1 and the second joint 2;

[0076] After the first connector 1 and the second connector 2 are tightened and fixed, environmental vibration of a preset frequency is applied to the explosion-proof quick connector, and the vibration acceleration, real-time contact resistance and real-time diameter of the positioning pin 107 after each plugging and unplugging of the explosion-proof quick connector 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] It can be understood that the assembly process is to align the positioning pin 107 of the first connector 1 vertically with the positioning hole 210 of the second connector 2, push it in until the positioning pin 107 and the positioning hole 210 are completely fitted together, fix the first connector 1 on one side, and slowly rotate the lock nut 205 on the other side. When the lock nut 205 rotates, since the first connector 1 has a spiral structure, it can drive the first connector 1 to move axially toward the inside of the second connector 2 through threaded transmission, so that the plug 101 is gradually inserted into the jack 201, and after being limited by the limiting plate 208, the set screw 207 is rotated, and the tip of the set screw 207 will press against the outer wall of the first connector 1 to form an anti-loosening lock. At this time, the first connector 1 and the second connector 2 are tightly fixed. Through the above steps, it is ensured that the first connector 1 and the second connector 2 are safely and reliably mechanically and electrically connected.

[0078] It is understandable that when a connector is in a flammable and explosive environment, excessive environmental vibration can lead to mechanical fatigue and loosening. Wear of the locating pin 107 and large external vibrations can affect the alignment accuracy and contact stability of the connector. For example, vibration can cause increased wear of the locating pin 107, reducing the actual contact area between the locating hole 210 and the locating pin 107. The contact resistance is inversely proportional to the contact area. At the same time, the metal particles and oxide layer produced during the wear process increase the roughness of the contact surface, resulting in a nonlinear increase in contact resistance. Increased resistance can lead to heat generation and increased energy consumption, affecting electrical connection performance. Since explosion-proof quick connectors are frequently plugged and unplugged during assembly and use, the connectors will experience a certain amount of wear after multiple uses due to environmental vibration and plugging and unplugging. Therefore, the electrical safety index of the explosion-proof quick connector is determined based on the vibration influence coefficient of the wear of the locating pin 107 and the real-time contact resistance.

[0079] In a specific embodiment, after the first joint 1 and the second joint 2 are tightened and fixed, environmental vibration of a preset frequency is applied to the explosion-proof quick connector. The preset frequency ranges from 30 Hz to 100 Hz, and preferably, the preset frequency is 65 Hz. In implementation, the range and preferred value of the preset frequency can be determined based on actual conditions and are not specifically limited here and will not be further described.

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

[0081] In a specific embodiment, the wear amount of each positioning pin 107 = initial diameter - real-time diameter, and the degree of positioning pin wear = average of the sum of the wear amounts of each positioning pin / initial diameter. The explosion-proof quick connector can be connected to an external acceleration sensor, and the vibration acceleration of the explosion-proof quick connector can be characterized by the vibration intensity of the working environment, or by obtaining 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 as follows:

[0082]

[0083] The vibration acceleration threshold value range is 0.5-1m / s 2 Preferably, the threshold value of the vibration acceleration is 0.7m / s 2 .

[0084] Specifically, determine the electrical safety index of the explosion-proof quick connector, including:

[0085] Determine a resistance safety factor according to the real-time contact resistance and the initial contact resistance, and determine an electrical safety index according to the resistance safety factor and the vibration influence factor;

[0086] Based on the 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 standard.

[0087] In a specific embodiment, the resistance safety factor = real-time contact resistance / initial contact resistance, and the calculation formula of the electrical safety index S is as follows:

[0088]

[0089] Among them, α is used to quantify the influence weight of vibration wear on electrical performance, with a value of 0.4, β is used to quantify the deterioration degree of the electrical factor itself, with a value of 0.6, and K is the vibration influence coefficient. It is understood that the initial contact resistance is the data obtained from the first contact resistance test of the explosion-proof quick connector, and the real-time contact resistance is the data obtained from the current contact resistance test of the explosion-proof quick connector.

[0090] In a specific embodiment, if the electrical safety index is less than the preset electrical safety index threshold, 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 has a value range of 0.7 to 0.85, and preferably, the preset electrical safety index threshold has a value of 0.78. In practice, the value range and preferred value of the preset electrical safety index threshold can be determined based on actual conditions and are not specifically limited here and will not be further described.

[0092] The present invention detects the vibration acceleration, real-time contact resistance, and real-time diameter of the joint 107 in real time. By quantitatively analyzing these key parameters, the vibration influence coefficient and electrical safety index are determined, thereby achieving a dynamic assessment of the operating status of the explosion-proof quick connector. When the electrical safety index exceeds a preset electrical safety index threshold, it is determined that the explosion-proof quick connector has an electrical safety risk, and it is determined that the explosion-proof quick connector does not meet the assembly standards. An early warning is issued before a failure occurs, facilitating maintenance personnel to take timely measures and reducing the probability of equipment failure and safety accidents. When the electrical safety index is less than or equal to the preset electrical safety index threshold, it is determined that the explosion-proof quick connector does not have an electrical safety risk, and it is determined that the explosion-proof quick connector meets the assembly standards, completing the assembly of the explosion-proof quick connector.

[0093] Specifically, the tooth profile height and vibration acceleration of several tooth positions of the threaded structure can be regularly detected, and the degree of wear of the threaded 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] It is understandable that during joint use, selecting several tooth positions to measure thread profile height can more comprehensively reflect the overall wear of the threads and avoid errors caused by single-point measurement. Monitoring the vibration amplitude of the joint can timely capture dynamic changes in the joint's working environment. Comparing the detected thread profile height with the initial thread profile height to determine the degree of thread wear can intuitively and accurately determine the thread wear status. The vibration amplitude represents the severity of the rapid explosion-proof joint's working environment. Combining the vibration amplitude and thread wear status can comprehensively assess the safety and reliability of the joint under current operating conditions, using the safety factor as a quantitative indicator.

[0095] In a specific embodiment, the tightening force of the set screw 207 is limited to the set screw 207 completely contacting the first connector 1 without slipping, and after tightening, 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 is in the range of 0.8 to 1.4 mm, preferably, 1 mm. In practice, the range and preferred value of the initial tooth profile height can be determined based on actual conditions and are not specifically limited here and will not be elaborated on.

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

[0098] Since explosion-proof quick connectors have the characteristics of rapid assembly and disassembly, they may be subject to certain wear after several assemblies, which may affect the electrical performance and safety of the connector after assembly. Therefore, the thread height of the current explosion-proof quick connector before the current assembly can be tested to determine the degree of wear.

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

[0100] Specifically, a vibration wear coefficient is determined according to the wear degree and the vibration amplitude of the joint, and the insurance factor is determined based on the vibration wear coefficient.

[0101] Specifically, the reminder timing is determined based on the comparison result of the insurance coefficient and the insurance threshold, wherein, if the insurance coefficient is lower than the insurance threshold, it is determined that there is an assembly risk of the explosion-proof quick connector, and the reminder timing is triggered; if the insurance coefficient is greater than or equal to the insurance threshold, the assembly risk reminder is not triggered.

[0102] It can be understood that the degree of wear is a quantitative indicator of the degree of surface loss of the threaded structure of the first joint 1 due to the influence of vibration factors in a flammable and explosive environment and after several assembly and disassembly. The joint vibration amplitude is the vibration range of the quick explosion-proof joint detected during several historical working processes in a flammable and explosive environment. By establishing a relationship between the degree of wear, the joint vibration amplitude and the vibration wear coefficient, the vibration wear coefficient, that is, the impact of vibration on the degree of wear of the threaded structure, can be determined. The safety factor is a quantitative indicator of the threaded structure under a certain degree of wear without causing the joint to loosen due to vibration and can maintain a tightly connected state.

[0103] In a 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 significantly impact 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. Because the NPG and the while-drilling data acquisition system require dedicated signal cables for transmission, and the operating environment is complex, such as those found in flammable, explosive, corrosive, or high-humidity environments at the wellsite, the environmental severity index is negatively correlated with the safety factor. The environmental severity index ranges from [0, 1]. The environmental severity index is the weighted sum of various environmental types, with different weights for different environmental types. Flammable and explosive environments include flammable and explosive environments, high-humidity environments, and corrosive environments. The maximum sum of the weights is 1, and the corresponding maximum weights are 0.5, 0.25, and 0.25, respectively. Preferably, in this scenario, the environmental severity index is 0.8, and the safety threshold ranges from 0.7 to 1. Preferably, the safety threshold is 0.85. In implementation, the insurance threshold, the value range and preferred value of the weights of different environmental types in the environmental severity coefficient can be determined according to actual conditions, and are not specifically limited here and will not be elaborated on.

[0104] The present invention compares the real-time measured thread profile height with a preset value to determine the degree of wear of the thread structure on the first joint 1, which facilitates the staff to quickly understand the actual wear condition of the thread, and then comprehensively considers the degree of wear and the vibration amplitude of the joint to calculate the safety coefficient, and dynamically adjusts it according to the actual situation. The safety status of the joint under complex working conditions is accurately reflected through the safety coefficient, which effectively avoids safety hazards caused by joint wear or vibration, provides strong technical guarantee for the stable operation and safe production of the equipment, and significantly improves the reliability and safety of the use of explosion-proof quick connectors.

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

[0106] Specifically, after calculating the safety coefficient of the explosion-proof quick connector, if the safety coefficient is greater than or equal to the safety threshold, the safety threshold is compared with the safety coefficient to obtain a safety ratio (≤1), and 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 practice, the insurance coefficient is inversely proportional to the insurance ratio. The larger the insurance coefficient, the smaller the insurance ratio, indicating that the physical connection stability of the explosion-proof quick connector is high and it can withstand relatively higher electrical risks to a certain extent. The electrical safety index threshold standard can be lowered, and more explosion-proof quick connectors can be judged as qualified. Therefore, the corresponding preset electrical safety index threshold should be lower. Therefore, the preset electrical safety index threshold is adjusted based on the insurance coefficient. The preset electrical safety index threshold = insurance ratio × basic electrical safety index threshold,

[0108] The basic electrical safety index threshold is set to the minimum value of the electrical safety index calculated from data from several explosion-proof quick connectors that passed electrical performance tests after 1000 plug-in and unplug cycles. Alternatively, the threshold can be adjusted based on actual scenarios and is not specified here.

[0109] Thus far, the technical solutions of the present invention have been described in conjunction with 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 may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An assembly method for an NPG-specific explosion-proof quick connector, characterized in that: NPG special explosion-proof quick connector includes: A first connector, wherein a first plug portion is provided inside, a plurality of plugs are provided at one end of the first plug portion, and a first plug tail fixedly connected to the signal cable is provided at the other end of the first plug portion; A second connector, wherein a second plug portion is provided inside the connector, a plurality of jacks are provided at one end of the second plug portion for forming a stable electrical connection with the plug, and a second plug tail is provided at the other end of the second plug portion; The first plug portion is connected to the first connector housing via a first plug positioning key, and the second plug portion is connected to the second connector housing via a second plug positioning key. A threaded structure is provided on the surface of the first connector housing on the side away from the signal cable, and a lock nut is provided on the outer surface of the second connector housing on the side away from the signal cable to achieve a stable connection between the first connector housing and the second connector housing. A set screw for fixing the first joint housing is provided inside the lock nut, and a limit spring is provided above the lock nut for limiting axial movement of the set screw; A positioning pin is provided at the end of the first connector housing away from the signal cable, and a positioning hole is provided at the end of the second connector housing away from the signal cable that matches the shape of the positioning pin; The assembly method comprises: Align the positioning pin of the first connector with the positioning hole of the second connector for positioning connection; Rotate the lock 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 joint to tightly fix the first joint and the second joint; After the first connector and the second connector are tightened and fixed, environmental vibration of a preset frequency is applied to the explosion-proof quick connector, and the vibration acceleration, real-time contact resistance and real-time diameter of the positioning pin after each plugging and unplugging of the explosion-proof quick connector 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.

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

3. The assembly method of the NPG special explosion-proof quick connector according to claim 2, characterized in that: Each plug outer shell is provided with an insulating sheath, and an insulating sheet in contact with the insulating sheath is provided between the insulating sheath and the first connector shell for electrical insulation.

4. The method for assembling the NPG special explosion-proof quick connector according to claim 1, characterized in that: The first plug protective shell is arranged on the outer side of the first plug tail wing of the first plug part, the second plug protective shell is arranged on the outer side of the second plug tail wing of the second plug part, and the adjustment sleeve is arranged on the outer side of the second plug protective shell.

5. The method for assembling the NPG special 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 shell and the NPG, a second sealing ring is provided between the first connector shell and the first plug part, a third sealing ring is provided between the lock nut and the second connector shell, a fourth sealing ring is provided between the second connector shell and the second plug part, and a fifth sealing ring is provided between the second plug shell and the second plug tail wing.

6. The method for assembling the NPG special explosion-proof quick connector according to claim 5, characterized in that: The heat-resistant 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°C to 70°C.

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

8. The method for assembling an NPG-specific explosion-proof quick connector according to any one of claims 1 to 7, characterized in that: Determine the vibration influence coefficient of explosion-proof quick connector, including: The wear amount of each positioning pin is determined according to the initial diameter of the positioning pin and the real-time diameter 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.

9. The method for assembling the NPG special explosion-proof quick connector according to claim 8, characterized in that: Determine the electrical safety index of the explosion-proof quick connector, including: Determine a resistance safety factor according to the real-time contact resistance and the initial contact resistance, and determine an electrical safety index according to the resistance safety factor and the vibration influence factor; Based on the 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 standard, wherein: If the electrical safety index is less than the preset electrical safety index threshold, the explosion-proof quick connector does not meet the assembly standard.

10. The method for assembling an NPG-specific explosion-proof quick connector according to claim 1, characterized in that: Also includes: After several assemblies, the thread profile heights and vibration accelerations of several tooth positions of the threaded structure are tested, and the degree of wear of the threaded structure is determined based on the thread profile heights and the initial thread profile heights. The safety factor of the explosion-proof quick connector is determined based on the wear degree and the vibration acceleration to remind workers to replace the connector.

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