Waterproof and fireproof MC4 joint protection device

Abstract

The invention relates to the technical field of joint protection, and discloses a waterproof and fireproof MC4 joint protection device, which comprises a first shell, a second shell and a ring shell, end shells are arranged outside the first shell and the second shell, and the ring shell is mounted on the outer sides of the end shells through screw-thread fit; a conical sealing inner ring is arranged in the end shell; a conical guide ring is arranged outside the ring shell and located in the conical sealing inner ring. Pressure relief holes are formed in the inner wall sides of the first shell and the second shell, and alloy pins are installed in the pressure relief holes. A blocking table is integrally formed on the side, close to the second shell, of the exterior of the first shell, and a side ring table is integrally formed on the side, close to the first shell, of the exterior of the second shell. Double sealing is achieved through cooperation of the shell, the annular shell and other structures, the connection stability is improved through threaded fit, high-temperature pressure relief is achieved through the alloy pins and the pressure relief holes, and the waterproof pressure relief device is good in waterproofness, safe and durable.

Description

Technical Field

[0001] This invention relates to the field of connector protection technology, specifically a waterproof and fireproof MC4 connector protection device. Background Technology

[0002] As a key connection component between photovoltaic modules and inverters in a photovoltaic system, the MC4 connector is often exposed to the outdoors and is susceptible to factors such as rain, dust, and temperature fluctuations. Therefore, MC4 connector protection devices play an important role in ensuring the reliability and service life of the connector connection and are widely used in photovoltaic power plants, distributed photovoltaic and other related fields.

[0003] Existing MC4 connector protection devices typically use a single sealing ring to achieve a seal. However, this method is prone to aging and failure of the sealing ring after long-term use, leading to a decline in sealing performance and subsequent water ingress. The housing connections often employ snap-fit ​​connections, which are prone to loosening under long-term vibration, resulting in insufficient connection stability. Regarding fire safety, most devices lack a dedicated pressure relief structure, and while some use fusible components, their response is slow. When internal temperatures rise, they cannot quickly release pressure, potentially causing the device to explode. Therefore, a waterproof and fireproof MC4 connector protection device is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a waterproof and fireproof MC4 connector protection device to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waterproof and fireproof MC4 connector protection device, comprising:

[0006] The first housing, the second housing, and the annular housing are provided with end shells on the outside of the first housing and the second housing, and the annular housing is installed on the outside of the end shell by threaded engagement.

[0007] The end shell is provided with a conical sealing inner ring inside, and the conical sealing inner ring is fixedly connected to the end shell;

[0008] A tapered guide ring is provided outside the ring shell, inside the tapered sealing inner ring, and the tapered guide ring is fixedly connected to the ring shell;

[0009] Pressure relief holes are provided on the inner walls of the first and second housings, and the pressure relief holes are integrally formed with the first and second housings. An alloy pin is installed inside the pressure relief holes.

[0010] A baffle is integrally formed on the outer side of the first housing near the second housing, and a side ring platform is integrally formed on the outer side of the second housing near the first housing. A connecting housing is provided on the outer side of the first housing, and the connecting housing and the side ring platform are connected by a threaded engagement.

[0011] The first and second housings provide a sealed installation space for the MC4 connector. The threaded engagement between the end housing and the ring housing ensures a reliable connection, facilitates disassembly and assembly, and provides excellent initial sealing. The conical sealing inner ring engages with the conical guide ring of the ring housing, laying the structural foundation for subsequent compression sealing and enhancing the seal between the line and the housing. The combination of the pressure relief hole and the alloy pin is the core fireproof design. The alloy pin, which melts at temperatures above 80°C, can release the internal pressure in a timely manner, preventing the risk of explosion from the source. The threaded engagement between the baffle, side ring platform, and connecting housing makes the connection between the housings tighter, providing structural support for the seal between the housings. The overall structure works together to ensure the reliability of the waterproof and fireproof basic frame.

[0012] Preferably, a second sealing ring is provided between the first housing and the second housing, and the second sealing ring is fixedly connected to the second housing;

[0013] The second sealing ring between the first and second housings is a key structure for improving the sealing performance between the housings. Its fixed connection with the second housing avoids the problem of sealing ring displacement or detachment during installation or use, which would lead to sealing failure. When the connecting housings are pressed against the baffle by the thread, the second sealing ring is tightly pressed between the two housings to form an elastic sealing surface, which can effectively prevent rainwater, moisture, dust and other impurities from entering the housing and contacting the MC4 connector. This design fills the tiny gaps between the housing mating surfaces, solves the defect of insufficient sealing due to rigid mating of metal housings, greatly improves the overall waterproof performance of the device, and ensures the insulation and connection stability of the MC4 connector in humid and dusty environments.

[0014] Preferably, a first reset spring is installed inside the first housing near one end of the end shell, and the first reset spring is fixedly connected to the first housing;

[0015] The first return spring, fixed inside the first housing near one end of the end housing, is the core power source for improving the stability of the MC4 connector. Its fixed connection ensures that the spring will not shift when under force, and can continuously provide stable elastic force. When the first housing and the second housing are in contact, the first return spring can push the retaining ring to precisely squeeze the end of the MC4 connector, so that the male and female pins of the connector are in tight contact, reducing the loosening of the connector due to vibration and temperature changes. This elastic squeezing design can adapt to small errors in connector installation, avoid rigid squeezing from damaging the interface, and the continuous pre-tightening force can reduce contact resistance, reduce the risk of overheating, indirectly improve fire safety, and ensure the stable conductivity of the connector during long-term use.

[0016] Preferably, a retaining ring is provided at one outer end of the first reset spring, and the retaining ring is fixedly connected to the first reset spring;

[0017] The retaining ring, fixedly connected to the first return spring, plays a crucial role in force transmission and pressure equalization. Compared to the spring directly pressing the MC4 connector, the retaining ring increases the contact area with the connector end, distributing the spring force evenly at the connector end and preventing excessive local pressure from damaging the connector shell or internal pins. Its fixed connection ensures synchronous action with the spring, achieving stable compression of the connector and preventing uneven pressure caused by spring extension and contraction. At the same time, the retaining ring can axially limit the MC4 connector, restricting its displacement within the shell and further improving connection stability. Combined with the spring's preload, it ensures that the connector maintains reliable contact under vibration, impact, and other operating conditions.

[0018] Preferably, a first sealing ring is embedded inside the annular shell, and the first sealing ring is fixedly connected to the annular shell;

[0019] The first sealing ring, embedded and fixed inside the ring shell, is a key structure for strengthening the seal between the ring shell and the production line. The embedded installation method ensures a tight fit between the sealing ring and the ring shell, preventing the sealing ring from falling off due to the pulling of the production line or environmental vibration during use, thus ensuring the durability of the seal. When the ring shell moves towards the end shell, the conical guide ring squeezes the conical sealing inner ring to fit the production line, while the first sealing ring is tightly squeezed between the ring shell and the production line, forming a double sealing structure. This design effectively prevents moisture from seeping in from the gap between the production line and the ring shell, solving the sealing problem when there are slight differences in the diameter of the production line. Combined with the conical sealing structure, it forms multiple waterproof barriers, significantly improving the sealing reliability of the device at the production line inlet.

[0020] Preferably, a side frame is provided at one end of the outer side of the connecting housing, and the side frame is welded to the connecting housing;

[0021] The side bracket welded to one end of the connecting housing provides a stable mounting support for the lever. The welded connection offers advantages such as high strength and stability, capable of withstanding the leverage force generated during lever operation, preventing loosening or breakage due to frequent use, and ensuring structural durability. The side bracket allows the lever to be installed with a reasonable lever arm, enabling operators to drive the connecting housing to rotate with less force, reducing operational difficulty. Simultaneously, the rigid welded connection ensures the lever's axis stability during rotation, preventing wobbling that could lead to limit mechanism failure, providing a reliable solution for precise lever operation and limit storage.

[0022] Preferably, a lever is installed inside the side frame, and the lever is rotatably connected to the side frame. A side cavity is formed inside the first housing near the lever, and the side cavity is integrally formed with the first housing.

[0023] The rotating connection between the lever and the side frame, the integral molding of the side cavity, and the fixed installation of the telescopic rod constitute a convenient and reliable basic structure for operation and limiting. The rotating connection of the lever allows the operator to unlock and lock the limit position through a flipping action, making operation simple and efficient. The integral molding of the side cavity and the first housing ensures the sealing and structural strength of the internal components, preventing impurities from entering and affecting the operation of the limiting mechanism. The design of fixing both ends of the telescopic rod provides precise guidance and positioning for the limiting ball, ensuring that the limiting ball can only move along the axial direction of the side cavity, avoiding misalignment that could lead to failure in the fit with the limiting groove. The overall structure is compact, cleverly integrating the operation and limiting mechanisms, which not only improves the convenience of operation but also ensures the reliability of the limiting mechanism.

[0024] Preferably, a telescopic rod and a limiting ball are installed sequentially from the inside to the outside of the side cavity, and the two ends of the telescopic rod are fixedly connected to the limiting ball and the side cavity, respectively.

[0025] The second return spring outside the telescopic rod inside the side cavity is the core power component for automatically limiting and retracting the lever. Its two ends are fixedly connected to the side cavity and the limiting ball, respectively, ensuring uniform force during spring extension and contraction and providing stable return force. When the lever flips towards the first housing until it is parallel to the outer wall, the second return spring can accurately push the limiting ball into the limiting groove of the lever, realizing automatic limiting of the lever and preventing the lever from flipping due to vibration or other unexpected situations during use, which could lead to seal failure. The elastic characteristics of the spring can adapt to the matching error between the limiting ball and the limiting groove, ensuring a tight fit. At the same time, its fatigue resistance is strong, ensuring a reliable return effect even after long-term frequent operation, thus improving the durability of the device.

[0026] Preferably, a second return spring is installed inside the side cavity outside the telescopic rod, and the two ends of the second return spring are fixedly connected to the side cavity and the limiting ball, respectively.

[0027] The integrally formed limiting groove on the lever, which matches the limiting ball, is a key structure ensuring the reliability of the lever's limiting function. The integral forming process ensures a firm connection between the limiting groove and the lever, reducing the risk of wear or breakage and extending service life. The precise fit between the limiting groove and the limiting ball ensures a stable limiting effect after the limiting ball is engaged, effectively fixing the lever's position and preventing it from rotating arbitrarily. When the lever is in the retracted state, this limiting fit maintains the thread preload of the connecting housing, preventing loosening that could lead to seal failure between the housings. At the same time, the precise fit reduces the difficulty of operation, allowing operators to clearly perceive the engagement, improving the user experience and ensuring the stable implementation of the sealing and limiting functions.

[0028] Preferably, a limiting groove is formed at the outer end of the lever near the limiting ball, and the limiting groove is integrally formed with the lever, and the limiting groove is adapted to the limiting ball;

[0029] The threaded connection between the connecting housing and the side ring platform, along with the retaining plate on the first housing, are the core structures for improving the sealing and robustness of the connection between the housings. The threaded connection offers advantages such as tight fit and high adjustability. Operators can achieve a tight fit between the two housings simply by rotating the connecting housing, which also facilitates installation and subsequent maintenance disassembly. When the connecting housing is rotated, the retaining plate is compressed internally, causing it to fit tightly against the side ring platform of the second housing, forming a rigid sealing support. This, combined with the second sealing ring, provides a double guarantee of rigid support and elastic sealing, significantly improving the sealing performance between the housings. The threaded connection has strong self-locking properties, resisting the influence of external forces such as vibration and preventing loosening. The retaining plate provides a stable force point for compression, ensuring uniform sealing pressure and guaranteeing long-term stability of waterproof and fireproof performance.

[0030] Compared with the prior art, the present invention provides a waterproof and fireproof MC4 connector protection device, which has the following beneficial effects:

[0031] This invention provides installation space for the MC4 connector through a first housing and a second housing. The threaded engagement between the end housing and the ring housing drives the tapered guide ring to press against the tapered sealing inner ring inside the end housing, achieving a seal between the line and the housing. The threaded engagement between the baffle, the side ring platform, and the connecting housing ensures a tight connection between the first housing and the second housing. The engagement between the pressure relief hole and the alloy pin allows the alloy pin to melt and release pressure at high temperatures. The above-mentioned engagement achieves a double seal between the line and the housing, and between the housings, as well as a high-temperature pressure relief function. It has the advantages of good waterproof performance, stable connector connection, and high fire safety, solving the problems of insufficient sealing performance, easy water ingress, easy loosening of the connector, and easy cracking under high temperature environment of traditional MC4 connector protection devices. Attached Figure Description

[0032] Figure 1 This is a perspective view of the overall structure of the present invention;

[0033] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0034] Figure 3 For the present invention Figure 2 Enlarged view of a portion of region A in the middle;

[0035] Figure 4 This is a three-dimensional view of the overall structure of the present invention in a disassembled state.

[0036] In the figure: 1. First housing; 2. Second housing; 3. End housing; 4. Conical sealing inner ring; 5. Ring housing; 6. Conical guide ring; 7. First sealing ring; 8. First return spring; 9. Retaining ring; 10. Pressure relief hole; 11. Alloy pin; 12. Second sealing ring; 13. Connecting housing; 14. Stop platform; 15. Side ring platform; 16. Side frame; 17. Toggle rod; 18. Limiting groove; 19. Side cavity; 20. Telescopic rod; 21. Second return spring; 22. Limiting ball. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] This invention provides a technical solution: a waterproof and fireproof MC4 connector protection device. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 ,include:

[0039] The first housing 1, the second housing 2, and the annular housing 5 are provided with end shells 3 on the outside of the first housing 1 and the second housing 2, and the annular housing 5 is installed on the outside of the end shell 3 by threaded connection.

[0040] The end shell 3 is provided with a conical sealing inner ring 4, and the conical sealing inner ring 4 is fixedly connected to the end shell 3;

[0041] A tapered guide ring 6 is provided outside the ring shell 5, inside the tapered sealing inner ring 4, and the tapered guide ring 6 is fixedly connected to the ring shell 5;

[0042] Pressure relief holes 10 are provided on the inner wall sides of the first housing 1 and the second housing 2, and the pressure relief holes 10 are integrally formed with the first housing 1 and the second housing 2. An alloy pin 11 is installed inside the pressure relief holes 10.

[0043] A baffle 14 is integrally formed on the outer side of the first housing 1 near the second housing 2, and a side ring platform 15 is integrally formed on the outer side of the second housing 2 near the first housing 1. A connecting housing 13 is provided on the outer side of the first housing 1, and the connecting housing 13 and the side ring platform 15 are connected by a threaded engagement.

[0044] The first housing 1 and the second housing 2 provide a sealed installation space for the MC4 connector. The threaded engagement between the end housing 3 and the ring housing 5 ensures a reliable connection, facilitates disassembly and assembly, and provides excellent initial sealing. The conical sealing inner ring 4 engages with the conical guide ring 6 of the ring housing 5, laying the structural foundation for subsequent compression sealing and enhancing the seal between the line and the housing. The combination of the pressure relief hole 10 and the alloy pin 11 is the core fireproof design. The alloy pin 11, which melts at temperatures above 80°C, can release the internal pressure in a timely manner, preventing the risk of explosion from the source. The threaded engagement between the baffle 14, the side ring platform 15, and the connecting housing 13 makes the connection between the housings tighter, providing structural support for the seal between the housings. The overall structure works together to ensure the reliability of the waterproof and fireproof basic frame.

[0045] Please see Figure 2 and Figure 4 A second sealing ring 12 is provided between the first housing 1 and the second housing 2, and the second sealing ring 12 is fixedly connected to the second housing 2;

[0046] The second sealing ring 12 between the first housing 1 and the second housing 2 is a key structure for improving the sealing performance between the housings. Its fixed connection with the second housing 2 avoids the problem of sealing ring displacement or detachment during installation or use, which would lead to sealing failure. When the connecting housing 13 is pressed against the baffle 14 by the thread, the second sealing ring 12 will be tightly pressed between the two housings to form an elastic sealing surface, which can effectively prevent rainwater, moisture, dust and other impurities from entering the housing and contacting the MC4 connector. This design fills the tiny gaps between the housing mating surfaces, solves the defect of insufficient sealing due to rigid mating of metal housings, greatly improves the overall waterproof performance of the device, and ensures the insulation and connection stability of the MC4 connector in humid and dusty environments.

[0047] Please see Figure 2 A first return spring 8 is installed inside the first housing 1 near the end housing 3, and the first return spring 8 is fixedly connected to the first housing 1.

[0048] The first return spring 8, fixed inside the first housing 1 near the end housing 3, is the core power source for improving the stability of the MC4 connector. Its fixed connection ensures that the spring will not shift when under force, and can continuously provide stable elastic force. When the first housing 1 and the second housing 2 are in contact, the first return spring 8 can push the retaining ring 9 to precisely squeeze the end of the MC4 connector, so that the male and female pins of the connector are in close contact, reducing the loosening of the connector due to vibration and temperature changes. This elastic squeezing design can adapt to small errors in connector installation, avoid rigid squeezing from damaging the interface, and the continuous pre-tightening force can reduce contact resistance, reduce the risk of heat generation, indirectly improve fire safety, and ensure the stable conductivity of the connector during long-term use.

[0049] Please see Figure 2 A retaining ring 9 is provided at one end of the outer side of the first return spring 8, and the retaining ring 9 is fixedly connected to the first return spring 8.

[0050] The retaining ring 9, which is fixedly connected to the first return spring 8, plays a key role in force transmission and pressure equalization. Compared with the spring directly pressing the MC4 connector, the retaining ring 9 increases the contact area with the end of the connector, which can evenly distribute the spring force at the end of the connector and avoid excessive local pressure that could damage the connector shell or internal pins. Its fixed connection method ensures synchronous action with the spring, achieving stable compression of the connector and preventing uneven pressure caused by spring extension and contraction. At the same time, the retaining ring 9 can axially limit the MC4 connector, restricting the displacement of the connector within the shell, further improving connection stability. Combined with the preload of the spring, it ensures that the connector can maintain reliable contact under conditions such as vibration and impact.

[0051] Please see Figure 2 The first sealing ring 7 is embedded inside the annular shell 5, and the first sealing ring 7 is fixedly connected to the annular shell 5.

[0052] The first sealing ring 7, embedded and fixed inside the ring shell 5, is a key structure for strengthening the seal between the ring shell 5 and the production line. The embedded installation method ensures a tight fit between the sealing ring and the ring shell 5, preventing the sealing ring from falling off due to the pulling of the production line or environmental vibration during use, thus ensuring the durability of the seal. When the ring shell 5 moves towards the end shell 3, the conical guide ring 6 presses against the conical sealing inner ring 4 to fit the production line, while the first sealing ring 7 is tightly pressed between the ring shell 5 and the production line, forming a double sealing structure. This design effectively prevents moisture from seeping in from the gap between the production line and the ring shell 5, solving the sealing problem when there are slight differences in the diameter of the production line. Combined with the conical sealing structure, it forms multiple waterproof barriers, significantly improving the sealing reliability of the device at the production line inlet.

[0053] Please see Figure 2 and Figure 3 A side frame 16 is provided at one end of the outer side of the connecting housing 13, and the side frame 16 is welded to the connecting housing 13.

[0054] The side frame 16 welded to one end of the connecting housing 13 provides a stable mounting support for the lever 17. The welded connection has the advantages of high strength and good stability, and can withstand the leverage force generated when the lever 17 is operated, avoiding loosening or breakage of the side frame 16 due to frequent operation, thus ensuring structural durability. The side frame 16 allows the lever 17 to be installed with a reasonable lever arm, allowing the operator to drive the connecting housing 13 to rotate with a smaller force, reducing the difficulty of operation. At the same time, the rigid welded connection ensures the stability of the axis of the lever 17 during rotation, avoiding wobbling that could cause the limit fit to fail, and providing a reliable structure for the precise operation and limited storage of the lever 17.

[0055] Please see Figure 2 and Figure 3A lever 17 is installed inside the side frame 16, and the lever 17 is rotatably connected to the side frame 16. A side cavity 19 is opened at one end of the first housing 1 near the lever 17, and the side cavity 19 is integrally formed with the first housing 1.

[0056] The rotatable connection between lever 17 and side frame 16, the integral molding of side cavity 19, and the fixed installation of telescopic rod 20 constitute a convenient and reliable basic structure for operation and limiting. The rotatable connection of lever 17 allows the operator to unlock and lock the limit by flipping, making operation simple and efficient. The integral molding of side cavity 19 and first housing 1 ensures the sealing and structural strength of internal components and prevents impurities from entering and affecting the operation of the limiting mechanism. The design of fixed ends of telescopic rod 20 provides precise guidance and positioning for the limiting ball 22, ensuring that the limiting ball 22 can only move along the axial direction of side cavity 19 and preventing deviation that could lead to failure in cooperation with the limiting groove 18. The overall structure is compact, cleverly integrating operation and limiting mechanisms, which not only improves the convenience of operation but also ensures the reliability of limiting.

[0057] Please see Figure 2 and Figure 3 Inside the side cavity 19, a telescopic rod 20 and a limiting ball 22 are installed sequentially from the inside to the outside, and the two ends of the telescopic rod 20 are fixedly connected to the limiting ball 22 and the side cavity 19 respectively.

[0058] The second return spring 21 outside the telescopic rod 20 inside the side cavity 19 is the core power component for automatically limiting and storing the lever 17. Its two ends are fixedly connected to the side cavity 19 and the limiting ball 22 respectively, ensuring that the force is uniform when the spring is extended and retracted, and providing a stable return force. When the lever 17 flips towards the first housing 1 to be parallel to the outer wall, the second return spring 21 can accurately push the limiting ball 22 into the limiting groove 18 of the lever 17, realizing the automatic limiting of the lever 17 and preventing the lever 17 from flipping due to vibration or other unexpected situations during use, which would cause the seal to fail. The elastic characteristics of the spring can adapt to the matching error between the limiting ball 22 and the limiting groove 18, ensuring a tight engagement. At the same time, its fatigue resistance is strong, which can ensure that it still maintains a reliable return effect after long-term frequent operation, improving the durability of the device.

[0059] Please see Figure 2 and Figure 3 A second return spring 21 is installed inside the side cavity 19 outside the telescopic rod 20, and the two ends of the second return spring 21 are fixedly connected to the side cavity 19 and the limiting ball 22 respectively.

[0060] The integrally formed limiting groove 18 on the lever 17, which is adapted to the limiting ball 22, is a key structure to ensure the reliability of the lever 17's limiting function. The integral forming process makes the limiting groove 18 firmly connected to the lever 17, less prone to wear or breakage, and extends its service life. The precise fit between the limiting groove 18 and the limiting ball 22 ensures that the limiting ball 22 can form a stable limiting effect after being engaged, effectively fixing the position of the lever 17 and preventing it from rotating arbitrarily. When the lever 17 is in the retracted state, this limiting fit can maintain the thread preload of the connecting housing 13, preventing it from loosening and causing the seal between the housings to fail. At the same time, the precise fit reduces the difficulty of operation, allowing the operator to clearly perceive that the engagement is in place, improving the operating experience and ensuring the stable realization of the sealing and limiting functions.

[0061] Please see Figure 2 and Figure 3 A limiting groove 18 is provided at one end of the lever 17 near the limiting ball 22, and the limiting groove 18 is integrally formed with the lever 17, and the limiting groove 18 is adapted to the limiting ball 22.

[0062] The threaded connection between the connecting housing 13 and the side ring platform 15, as well as the retaining plate 14 on the first housing 1, are the core structures for improving the sealing and robustness of the connection between the housings. The threaded connection has the advantages of tight connection and strong adjustability. Operators can achieve a tight fit between the two housings by rotating the connecting housing 13, which is also convenient for installation and subsequent maintenance and disassembly. When the connecting housing 13 is rotated, the retaining plate 14 is squeezed inside, so that the retaining plate 14 fits tightly with the side ring platform 15 of the second housing 2, forming a rigid sealing support. Together with the second sealing ring 12, it forms a double guarantee of rigid support and elastic sealing, which greatly improves the sealing performance between the housings. The threaded connection has strong self-locking properties and can resist the influence of external forces such as vibration, avoiding loosening of the connection. The retaining plate 14 provides a stable force point for compression, ensuring uniform sealing pressure and ensuring long-term stability of waterproof and fireproof performance.

[0063] This solution involves: placing two ring shells 5 on the outside of the two wire ends to be connected and moving them toward the direction opposite to the wire ends; then placing the first shell 1 and the second shell 2 on the outside of the two wire ends; then installing the MC4 connector on the outside of the two wire ends and merging them; moving the first shell 1 and the second shell 2 closer together; when the first shell 1 and the second shell 2 are in contact, the first return spring 8 pushes the retaining ring 9 to squeeze the end of the MC4 connector, thereby improving the stability of the MC4 connector connection.

[0064] Flip the lever 17 outwards, and the limiting groove 18 at the tail of the lever 17 disengages from the limiting ball 22, moving the connecting housing 13 toward the second housing 2 and engaging with the side ring platform 15. Rotate the connecting housing 13 by lever 17, and under the threaded engagement, the baffle 14 is squeezed inside the connecting housing 13, so that the baffle 14 and the side ring platform 15 fit tightly together, and at the same time, the second sealing ring 12 is squeezed, improving the sealing between the first housing 1 and the second housing 2.

[0065] The lever 17 is flipped toward the first housing 1. When the lever 17 is parallel to the outer wall of the first housing 1, the second return spring 21 returns to its original position and pushes the limiting ball 22 so that the limiting ball 22 is inserted into the limiting groove 18, thereby limiting the lever 17 and storing the lever 17 in this way.

[0066] The two ring shells 5 are moved toward the first shell 1 and the second shell 2 respectively, and the two ring shells 5 are respectively combined with the end shell 3. The conical guide ring 6 of the ring shell 5 extends into the end shell 3 and squeezes the conical sealing inner ring 4 inward, so that the conical sealing inner ring 4 fits the outside of the line body, and the sealing between the ring shell 5 and the line body is improved in conjunction with the first sealing ring 7.

[0067] When the temperature is greater than 80℃, the alloy pin 11 melts and automatically releases the pressure relief hole 10 to relieve pressure and prevent the joint protection device from exploding and injuring people.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof and fireproof MC4 connector protection device, characterized in that, include: The first housing (1), the second housing (2), and the annular housing (5) are provided with end shells (3) on the outside of the first housing (1) and the second housing (2), and the annular housing (5) is installed on the outside of the end shell (3) by threaded connection; The end shell (3) is provided with a conical sealing inner ring (4) inside, and the conical sealing inner ring (4) is fixedly connected to the end shell (3); A tapered guide ring (6) is provided outside the annular shell (5) inside the tapered sealing inner ring (4), and the tapered guide ring (6) is fixedly connected to the annular shell (5); The first housing (1) and the second housing (2) are provided with pressure relief holes (10) on their inner walls, and the pressure relief holes (10) are integrally formed with the first housing (1) and the second housing (2). An alloy pin (11) is installed inside the pressure relief holes (10). A baffle (14) is integrally formed on the outer side of the first housing (1) near the second housing (2), and a side ring platform (15) is integrally formed on the outer side of the second housing (2) near the first housing (1). A connecting housing (13) is provided on the outer side of the first housing (1), and the connecting housing (13) and the side ring platform (15) are connected by a threaded connection.

2. The waterproof and fireproof MC4 connector protection device according to claim 1, characterized in that: A second sealing ring (12) is provided between the first housing (1) and the second housing (2), and the second sealing ring (12) is fixedly connected to the second housing (2).

3. The waterproof and fireproof MC4 connector protection device according to claim 1, characterized in that: A first reset spring (8) is installed inside the first housing (1) near the end shell (3), and the first reset spring (8) is fixedly connected to the first housing (1).

4. The waterproof and fireproof MC4 connector protection device according to claim 3, characterized in that: A retaining ring (9) is provided at one end of the first reset spring (8), and the retaining ring (9) is fixedly connected to the first reset spring (8).

5. A waterproof and fireproof MC4 connector protection device according to claim 1, characterized in that: The first sealing ring (7) is embedded inside the ring shell (5), and the first sealing ring (7) is fixedly connected to the ring shell (5).

6. A waterproof and fireproof MC4 connector protection device according to claim 1, characterized in that: A side frame (16) is provided at one end of the outer side of the connecting housing (13), and the side frame (16) is welded to the connecting housing (13).

7. A waterproof and fireproof MC4 connector protection device according to claim 6, characterized in that: The side frame (16) is equipped with a lever (17) inside, and the lever (17) is rotatably connected to the side frame (16). The first housing (1) has a side cavity (19) at one end near the lever (17), and the side cavity (19) is integrally formed with the first housing (1).

8. A waterproof and fireproof MC4 connector protection device according to claim 7, characterized in that: The inside of the side cavity (19) is equipped with a telescopic rod (20) and a limiting ball (22) in sequence from the inside to the outside, and the two ends of the telescopic rod (20) are fixedly connected to the limiting ball (22) and the side cavity (19) respectively.

9. A waterproof and fireproof MC4 connector protection device according to claim 8, characterized in that: The second return spring (21) is installed inside the side cavity (19) outside the telescopic rod (20), and the two ends of the second return spring (21) are fixedly connected to the side cavity (19) and the limiting ball (22) respectively.

10. A waterproof and fireproof MC4 connector protection device according to claim 9, characterized in that: A limiting groove (18) is provided at one end of the lever (17) near the limiting ball (22), and the limiting groove (18) is integrally formed with the lever (17). The limiting groove (18) is adapted to the limiting ball (22).

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