A waterproof electric connector

Abstract

This invention provides a waterproof electrical connector, including a male connector and a female connector. The male connector has a receiving section, and the female connector has a receiving cavity. When the male and female connectors are mated, the receiving cavity is fitted outside the receiving section. A compressed air chamber is formed between the movable end of the receiving section and the closed end of the receiving cavity. An air gap is formed between the outer wall of the receiving section and the inner wall of the receiving cavity. A primary sealing structure and a secondary sealing structure are provided within the air gap. The primary sealing structure continuously seals the air gap. The secondary sealing structure includes an inflation chamber and a control valve assembly connected to the inflation chamber. The control valve assembly controls whether the inflation chamber is isolated from or connected to the compressed air chamber, thereby placing the secondary sealing structure in a contracted state that avoids the air gap or an expanded state that seals the air gap. The primary sealing structure provides a basic static seal. When the primary sealing structure fails due to aging or scratches, the secondary sealing structure can expand by inflation, tightly fitting the inner wall of the receiving cavity, providing a reliable second line of defense.

Description

Technical Field

[0001] This invention relates to the field of electrical connector technology, specifically to a waterproof electrical connector. Background Technology

[0002] In harsh environments such as deep-water operations, aerospace, and outdoor communication base stations, the waterproof reliability of electrical connectors is directly related to the safe operation of the entire system. Traditional waterproof electrical connectors typically have an elastic sealing ring (such as an O-ring or rectangular ring) between the male and female connectors. Through mechanical compression during the connection, interference deformation is generated, thereby preventing moisture from entering the internal circuitry.

[0003] However, this traditional single-seal structure has obvious technical defects and safety hazards in practical applications:

[0004] Current technology relies excessively on a single sealing line. During long-term use, if this single seal fails locally due to material aging, accidental scratches, inclusion of minute foreign objects, or uneven stress, external moisture can immediately penetrate, causing internal short circuits, contact corrosion, and even equipment burnout. Due to the lack of a "second sealing line," such single-point failures are often sudden and irreversible, resulting in extremely low system fault tolerance. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a waterproof electrical connector. When the main sealing structure fails due to aging, damage, or other factors, the secondary sealing structure can be inflated and expanded to generate radial deformation, thereby sealing the air gap and forming a reliable second line of defense.

[0006] The present invention adopts the following technical solution.

[0007] A waterproof electrical connector includes a male connector and a female connector, wherein the male connector has a receiving section and the female connector has a receiving cavity;

[0008] When the male connector and the female connector are in the mating state, the receiving cavity is sleeved on the outside of the receiving section, and a compressed air chamber is formed between the movable end of the receiving section and the closed end of the receiving cavity. An air gap is formed between the outer wall of the receiving section and the inner wall of the receiving cavity. The air gap is provided with a main sealing structure and a secondary sealing structure.

[0009] The main sealing structure is used to continuously seal air gaps;

[0010] The secondary sealing structure includes an inflation chamber and a control valve assembly connected to the inflation chamber. The control valve assembly is used to control the inflation chamber to be isolated from or connected to the compression chamber, thereby placing the secondary sealing structure in a contracted state that avoids the air gap or an expanded state that seals the air gap.

[0011] Furthermore, the control valve assembly includes a first valve core and a second valve core that are slidably and sealingly connected to the male connector;

[0012] A first air storage chamber is formed between the first end of the first valve core and the male connector. The first air storage chamber is connected to the pressure chamber through the first air passage. A first one-way valve is provided in the first air passage. The first one-way valve is used to restrict the air in the first air storage chamber from flowing into the pressure chamber through the first air passage. A first thrust spring is connected to the second end of the first valve core.

[0013] A second air storage chamber is formed between the first end of the second valve core and the male connector. The second air storage chamber is connected to the air compression chamber through a second air passage. A second thrust spring is connected to the second end of the second valve core.

[0014] The second end of the second valve core and the male connector form an air guide chamber that communicates with the air filling chamber. The second valve core has an air passage gap that connects the air guide chamber and the second air storage chamber. The second valve core can block or open the air passage gap.

[0015] When the air pressure in the second air chamber is equal to the air pressure in the first air chamber, the second valve core blocks the air passage gap, thereby preventing air from flowing into the inflation chamber from the second air chamber.

[0016] When the air pressure in the second air chamber is lower than that in the first air chamber, the second valve core opens the ventilation gap, thereby allowing air in the second air chamber to flow into the inflation chamber.

[0017] Furthermore, an inflation channel is connected between the air guiding chamber and the inflation chamber, and a second one-way valve diaphragm is provided in the inflation channel. The second one-way valve diaphragm is used to restrict the flow of air from the inflation chamber into the air guiding chamber through the inflation channel.

[0018] Furthermore, the main sealing structure includes a solid sealing ring, and the outer side wall of the receiving section has an annular mounting groove, in which the sealing ring is located.

[0019] Furthermore, the secondary sealing structure includes a sealing sleeve fitted over the outside of the receiving section. The sealing sleeve is elastic, and the end of the sealing sleeve is integrally connected to the receiving section. The inflation chamber is formed between the inner wall of the sealing sleeve and the outer wall of the receiving section.

[0020] Furthermore, the outer wall of the sealing sleeve is provided with an integrally extended sealing lip;

[0021] When the secondary sealing structure is in an expanded state, the sealing lip is conical, with the end closest to the air chamber being the larger end and abutting against the inner wall of the receiving cavity.

[0022] Furthermore, an annular storage groove is provided on the outer wall of the receiving section, and the seal is fitted inside the storage groove;

[0023] The male connector is sealed and slidably connected to a sliding block, and the sliding block is provided with a cover ring that can open or close the storage slot;

[0024] The sliding block near the storage groove forms an auxiliary air chamber with the male connector. The auxiliary air chamber is connected to the inflation chamber. A return spring is connected to the end of the sliding block facing away from the storage groove.

[0025] Furthermore, the storage tank is filled with a protective liquid that immerses the sealing sleeve.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention incorporates a primary sealing structure and a secondary sealing structure within the air gap. During the connection process between the male and female connectors, the primary sealing structure continuously seals the air gap. As the receiving section of the male connector gradually inserts into the receiving cavity of the female connector, the air in the compression chamber is compressed, resulting in a higher air pressure inside the compression chamber than the external air pressure. This not only effectively prevents external impurities and moisture from entering the compression chamber but also reserves high-pressure air for the subsequent activation of the secondary sealing structure. When the primary sealing structure fails, the control valve assembly connects the inflation chamber and the compression chamber. The high-pressure air in the compression chamber then serves as the power source for the secondary sealing structure, causing it to inflate and expand radially, thereby sealing the air gap and forming a reliable second line of defense. This effectively blocks the communication path between the compression chamber and the outside through the air gap, ensuring the sealing reliability of the electrical connection between the male and female connectors.

[0028] This invention effectively prevents overall connection and sealing failure caused by single-point failure by using a structure in which the main sealing structure and the secondary sealing structure are independent and complementary. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a cross-sectional view of the male connector and female connector before they are inserted in one embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of the male connector in one embodiment of the present invention;

[0032] Figure 3 This is a cross-sectional view of the female connector in one embodiment of the present invention;

[0033] Figure 4This is one of the cross-sectional views of the male and female connectors after they are plugged into each other in one embodiment of the present invention (at which time the secondary sealing structure is in a contracted state).

[0034] Figure 5 This is a second cross-sectional view of the male and female connectors after they are plugged in according to one embodiment of the present invention (at this time, the secondary sealing structure is in an expanded state).

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Male connector; 11. Receiving section; 111. Storage slot;

[0037] 2. Female connector; 21. Receptacle cavity;

[0038] 3. Compressed air chamber; 31. Air gap;

[0039] 4. Main sealing structure;

[0040] 5. Secondary sealing structure; 51. Sealing sleeve; 511. Sealing lip; 52. Inflation chamber;

[0041] 6. Control valve assembly; 61. First valve core; 611. First air reservoir; 612. First air passage; 613. First one-way valve disc; 614. First thrust spring; 62. Second valve core; 621. Second air reservoir; 622. Second air passage; 623. Second thrust spring; 624. Air guide chamber; 625. Air passage gap; 63. Air filling passage; 631. Second one-way valve diaphragm;

[0042] 71. Sliding block; 72. Covering ring; 73. Auxiliary air chamber; 74. Return spring. Detailed Implementation

[0043] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0044] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] As attached Figure 1-5 The waterproof electrical connector shown includes a male connector 1 and a female connector 2. The male connector 1 is provided with a receiving section 11, and the female connector 2 is provided with a receiving cavity 21.

[0046] When the male connector 1 and the female connector 2 are in the mating state, the receiving cavity 21 is sleeved on the outside of the receiving section 11. A compressed air chamber 3 is formed between the movable end of the receiving section 11 and the closed end of the receiving cavity 21. An air gap 31 is formed between the outer wall of the receiving section 11 and the inner wall of the receiving cavity 21. The air gap 31 is provided with a main sealing structure 4 and a secondary sealing structure 5.

[0047] The main sealing structure 4 is used to continuously seal the air gap 31;

[0048] The secondary sealing structure 5 includes an inflation chamber 52 and a control valve assembly 6 connected to the inflation chamber 52. The control valve assembly 6 is used to control the inflation chamber 52 to be isolated from or connected to the compressed air chamber 3, so that the secondary sealing structure 5 is in a contracted state that avoids the air gap 31 or an expanded state that blocks the air gap 31.

[0049] The main sealing structure 4 includes a solid sealing ring, and the outer side wall of the receiving section 11 has an annular mounting groove, in which the sealing ring is located.

[0050] Specifically, during the connection process between male connector 1 and female connector 2, the receiving section 11 gradually inserts into the receiving cavity 21. When the inner wall of the receiving cavity 21 contacts the outer wall of the sealing ring, a sliding seal is formed, preventing air from escaping from the air gap 31 within the compression chamber 3. As the insertion depth of the receiving section 11 increases, the volume of the compression chamber 3 gradually decreases, thereby increasing the air pressure within the compression chamber 3. Thus, when male connector 1 and female connector 2 are fully connected, the air pressure in the compression chamber 3 will be greater than the external air pressure, resulting in a positive pressure state. This positive pressure state effectively prevents external impurities and moisture from entering the compression chamber 3, ensuring the reliability of the electrical connection between male connector 1 and female connector 2 within the compression chamber 3.

[0051] In order to precisely control the triggering timing of the expansion of the secondary sealing structure 5, the control valve assembly 6 includes a first valve core 61 and a second valve core 62 that are slidably connected to the male connector 1.

[0052] A first air storage chamber 611 is formed between the first end of the first valve core 61 and the male connector 1. The first air storage chamber 611 is connected to the pressure chamber 3 through the first air passage 612. A first one-way valve 613 is provided in the first air passage 612. The first one-way valve 613 is used to restrict the air in the first air storage chamber 611 from flowing into the pressure chamber 3 through the first air passage 612. A first thrust spring 614 is connected to the second end of the first valve core 61.

[0053] A second air storage chamber 621 is formed between the first end of the second valve core 62 and the male connector 1. The second air storage chamber 621 is connected to the air compression chamber 3 through the second air passage 622. A second thrust spring 623 is connected to the second end of the second valve core 62.

[0054] The second end of the second valve core 62 forms a guide chamber 624 connecting the inflation chamber 52 with the male connector 1. A venting gap 625 is provided on the second valve core 62, connecting the guide chamber 624 and the second air storage chamber 621. The first valve core 61 can block or open the venting gap 625. The first valve core 61 and the second valve core 62 constitute a differential pressure switch. The opening and closing of the venting gap 625 is determined by the relative position of the first valve core 61 and the second valve core 62.

[0055] Specifically, when the male connector 1 is not connected to the female connector 2, the first valve core 61 and the second valve core 62 are maintained in their initial relative positions in the venting gap 625 under the elastic force of the first thrust spring 614 and the second thrust spring 623, respectively.

[0056] During the connection process between male connector 1 and female connector 2, the air pressure in the compressor chamber 3 gradually increases. A portion of the high-pressure air in the compressor chamber 3 enters the first air storage chamber 611 through the first air passage 612, increasing the air pressure in the first air storage chamber 611. This, in turn, pushes the first valve core 61 away from the compressor chamber 3 and compresses the first thrust spring 614. Simultaneously, another portion of the high-pressure air in the compressor chamber 3 enters the second air storage chamber 621 through the second air passage 622, increasing the air pressure in the second air storage chamber 621. This, in turn, pushes the second valve core 62 away from the compressor chamber 3 and compresses the second thrust spring 623. Since the rate of increase in air pressure in the first air storage chamber 611 and the second air storage chamber 621 is the same, the first valve core 61 and the second valve core 62 will move away from the compressor chamber 3 at the same speed, maintaining their initial relative positions. The first valve core 61 continues to block the ventilation gap 625. After the male connector 1 and the female connector 2 are connected, the air pressure in the first air storage chamber 611 and the second air storage chamber 621 remains in a balanced state. The first valve core 61 and the second valve core 62 remain in their initial relative positions, and the first valve core 61 continues to effectively block the air passage gap 625.

[0057] Understandably, if the main sealing structure 4 is in good working condition, the air in the compression chamber 3 cannot escape through the air gap 31, and the air pressure in the compression chamber 3 will remain constant, thereby making the air pressure in the second air storage chamber 621 equal to the air pressure in the first air storage chamber 611.

[0058] When the air pressure in the second air chamber 621 is equal to the air pressure in the first air chamber 611, the first valve core 61 and the second valve core 62 will remain in their initial relative positions. The second valve core 62 will always block the ventilation gap 625, thereby preventing air in the second air chamber 621 from flowing into the inflation chamber 52.

[0059] Understandably, if the main sealing structure 4 fails, the air in the compression chamber 3 will leak out through the air gap 31, causing a drop in the air pressure inside the compression chamber 3. Since the first air passage 612 is equipped with a first one-way valve 613, which can prevent the air in the first air storage chamber 611 from flowing into the compression chamber 3 through the first air passage 612, the air pressure in the first air storage chamber 611 remains unchanged. However, since the second air passage 622 is not equipped with a similar one-way blocking structure, the air in the second air storage chamber 621 will flow into the compression chamber 3 through the second air passage 622 and flow to the outside together with the air in the compression chamber 3 through the air gap 31, thereby causing the air pressure in the second air storage chamber 621 to be lower than the air pressure in the first air storage chamber 611.

[0060] When the air pressure in the second air chamber 621 is lower than the air pressure in the first air chamber 611, the second thrust spring 623 pushes the second valve core 62 to move closer to the compressor chamber 3, causing the first valve core 61 and the second valve core 62 to shift away from their initial relative positions and become offset from each other. At this time, the second valve core 62 opens the ventilation gap 625, thereby allowing air in the second air chamber 621 to flow into the air guide chamber 624.

[0061] An inflation channel 63 connects the air guide chamber 624 and the inflation chamber 52. When the second valve core 62 opens the vent gap 625, the high-pressure air in the compressed air chamber 3 enters the second air storage chamber 621 through the second air channel 622, and flows into the inflation chamber 52 together with the air in the second air storage chamber 621 through the vent gap 625, the air guide chamber 624 and the inflation channel 63, causing the secondary sealing structure 5 to change from a contracted state to an expanded state.

[0062] The inflation channel 63 is provided with a second one-way valve diaphragm 631. The second one-way valve diaphragm 631 is used to restrict the air in the inflation chamber 52 from flowing into the air guide chamber 624 through the inflation channel 63, thereby effectively preventing the air from flowing back after the inflation chamber is inflated, so that the secondary sealing structure 5 can maintain the expanded state after expansion.

[0063] The secondary sealing structure 5 includes a sealing sleeve 51 fitted onto the outside of the receiving section 11. The sealing sleeve 51 is elastic, and its end is integrally connected to the receiving section 11. An inflation chamber 52 is formed between the inner wall of the sealing sleeve 51 and the outer wall of the receiving section 11. Specifically, when high-pressure air from the compressed air chamber 3 enters the inflation chamber 52, it causes the sealing sleeve 51 to expand. When the expanded sealing sleeve 51 abuts against the inner wall of the receiving cavity 21, the sealing sleeve 51 seals the air gap 31.

[0064] To further improve the sealing effect of the secondary sealing structure 5, an integrally extended sealing lip 511 is provided on the outer wall of the sealing sleeve 51.

[0065] When the secondary sealing structure 5 is in an expanded state, the sealing lip 511 is conical, with its larger end near the pressure chamber 3 abutting against the inner wall of the receiving cavity 21. Since the larger end of the cone faces the pressure chamber 3 (i.e., the high-pressure side), when the air pressure inside the pressure chamber 3 acts on the inner inclined surface of the conical lip, a radial force pointing towards the inner wall of the receiving cavity 21 is generated. This radial force causes the larger end of the sealing lip 511 to continuously press against the inner wall of the receiving cavity 21. The higher the air pressure inside the pressure chamber 3, the tighter the sealing lip 511 adheres to the inner wall of the receiving cavity 21, thus forming an adaptive reinforcement mechanism of the adhesion force.

[0066] To protect the sealing sleeve 51 in the contracted state, an annular receiving groove 111 is provided on the outer wall of the receiving section 11, and the sealing sleeve 51 is located in the receiving groove 111; a sliding block 71 is slidably connected to the male connector 1, and a cover ring 72 that can open or close the receiving groove 111 is provided on the sliding block 71; an auxiliary air chamber 73 is formed between the end of the sliding block 71 near the receiving groove 111 and the male connector 1, and the auxiliary air chamber 73 is connected to the inflation chamber 52; a return spring 74 is connected to the end of the sliding block 71 facing away from the receiving groove 111.

[0067] Specifically, when no high-pressure air is introduced into the inflation chamber 52, the sealing sleeve 51 is in a contracted state. Correspondingly, the air pressure in the auxiliary air chamber 73 is insufficient to push the sliding block 71 to overcome the elastic force of the return spring 74 and move away from the receiving groove 111. Therefore, the cover ring 72 on the sliding block 71 closes the receiving groove 111, so that the sealing sleeve 51 is wrapped in the sealed space formed by the receiving groove 111 and the cover ring 72, thereby reducing the erosion and interference of the external environment on the sealing sleeve 51.

[0068] The storage tank 111 is filled with a protective liquid that submerges the sealing sleeve 51. When the sealing sleeve 51 is not in use and is in a contracted state, the elastic sealing sleeve 51 is completely submerged in the protective liquid. The protective liquid creates an oxygen-free and UV-free liquid environment, completely isolating the rubber material from contact with ozone, moisture, and corrosive gases in the air, thereby avoiding the aging and cracking problems of the sealing sleeve 51.

[0069] Furthermore, when the sealing sleeve 51 begins to inflate and slides out of the receiving groove 111, the protective liquid adhering to the surface of the sealing sleeve 51 forms a fluid lubricating film. This greatly reduces the coefficient of friction between the sealing sleeve 51 and the cover ring 72, and between the sealing sleeve 51 and the inner wall of the receiving cavity 21 during initial contact, preventing the sealing sleeve 51 from curling or being sheared during ejection.

[0070] The working process of this invention is as follows:

[0071] When the male connector 1 and female connector 2 are not mated, the sealing sleeve 51 is in a contracted state, completely retracted into the receiving groove 111 of the receiving section 11. Simultaneously, under the action of the return spring 74, the sliding block 71 pushes the cover ring 72 to close and seal the opening of the receiving groove 111, thus sealing the sealing sleeve 51 within it. This design ensures that the sealing sleeve 51 is completely immersed in the protective liquid, preventing it from aging due to direct exposure to air and also preventing seal failure caused by impacts, scratches, or other factors.

[0072] During the docking process between male connector 1 and female connector 2, the receiving section 11 of male connector 1 will gradually insert into the receiving cavity 21 of female connector 2. The outer wall of the sealing ring on the receiving section 11 first abuts against the inner wall of the receiving cavity 21 to form a sealing sliding fit, thereby sealing the air gap 31 and blocking the communication path between the compressed air chamber 3 and the outside through the air gap.

[0073] As the receiving section 11 continues to be inserted, the volume of the compression chamber 3 gradually decreases, and the air pressure inside the compression chamber 3 increases. A portion of the high-pressure air in the compression chamber 3 enters the first air storage chamber 611 through the first air passage 612, increasing the air pressure inside the first air storage chamber 611. This pushes the first valve core 61 away from the compression chamber 3 and compresses the first thrust spring 614. Furthermore, because the first air passage 612 is equipped with a first one-way valve 613, the high-pressure air entering the first air storage chamber 611 cannot flow back, thus the first air storage chamber 611 maintains the peak pressure reached during insertion. Simultaneously, another portion of the high-pressure air in the compression chamber 3 enters the second air storage chamber 621 through the second air passage 622, increasing the air pressure inside the second air storage chamber 621. This pushes the second valve core 62 away from the compression chamber 3 and compresses the second thrust spring 623. Since no similar one-way blocking structure is set in the second air passage 622, the high-pressure air entering the first air storage chamber 611 can flow back. Therefore, the air pressure in the second air storage chamber 621 will decrease as the air pressure in the compressor chamber 3 decreases.

[0074] When the male connector 1 and female connector 2 are connected, the air pressure in the compressed air chamber 3 will be greater than the external air pressure, and it will be in a positive pressure state. Furthermore, if the main sealing structure 4 is functioning properly, the air in the compressed air chamber 3 cannot escape through the air gap 31, and the air pressure in the compressed air chamber 3 remains constant, making the air pressure in the second air storage chamber 621 equal to the air pressure in the first air storage chamber 611. At this time, the first valve core 61 and the second valve core 62 remain in their initial relative positions, and the first valve core 61 will always block the vent gap 625, thereby preventing the high-pressure air in the second air storage chamber 621 from entering the inflation chamber 52.

[0075] If the main sealing structure 4 fails, air will slowly leak from the compression chamber 3. This minute leakage will cause the air pressure in the second air storage chamber 621 and the compression chamber 3 to decrease synchronously, disrupting the force balance of the second valve core 62. This will cause the air pressure on the second valve core 62 to be less than the elastic force of the second thrust spring 623, causing the second valve core 62 to move closer to the compression chamber 3, thereby opening the ventilation gap 625.

[0076] When the ventilation gap 625 is opened, the air pressure in the second air storage chamber 621 and the compression chamber 3 is still greater than the outside air pressure. Therefore, the air in the second air storage chamber 621 first enters the air guide chamber 624 through the ventilation gap 625, then passes through the inflation channel 63 to open the second one-way valve diaphragm 631, and finally enters the inflation chamber 52 and the auxiliary air chamber 73.

[0077] As the air pressure in the auxiliary air chamber 73 increases sharply, the high-pressure air acts on the end of the sliding block 71 near the receiving groove 111, thereby generating an axial thrust. When this axial thrust is greater than the elastic force of the return spring 74, it will push the sliding block 71 to slide away from the receiving groove 111, thereby causing the cover ring 72 to exit the opening of the receiving groove 111, so that the receiving groove 111 changes from a closed state to an open state.

[0078] As the cover ring 72 exits the slot of the receiving groove 111, the air pressure accumulated in the inflation chamber 52 drives the sealing sleeve 51 to expand outward. Its conical sealing lip 511 expands outward without hindrance under the lubrication of the protective fluid and finally presses tightly against the inner wall of the receiving cavity 21 of the female connector 2.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A waterproof electrical connector, comprising a male connector and a female connector, characterized in that, The male connector is provided with a receiving section, and the female connector is provided with a receiving cavity; When the male connector and the female connector are in the mating state, the receiving cavity is sleeved on the outside of the receiving section, and a compressed air chamber is formed between the movable end of the receiving section and the closed end of the receiving cavity. An air gap is formed between the outer wall of the receiving section and the inner wall of the receiving cavity. The air gap is provided with a main sealing structure and a secondary sealing structure. The main sealing structure is used to continuously seal air gaps; The secondary sealing structure includes an inflation chamber and a control valve assembly connected to the inflation chamber. The control valve assembly is used to control the inflation chamber to be isolated from or connected to the compression chamber, so that the secondary sealing structure is in a contracted state that avoids the air gap or an expanded state that seals the air gap. The control valve assembly includes a first valve core and a second valve core that are slidably and sealingly connected to a male connector. A first air storage chamber is formed between the first end of the first valve core and the male connector. The first air storage chamber is connected to the pressure chamber through the first air passage. A first one-way valve is provided in the first air passage. The first one-way valve is used to restrict the air in the first air storage chamber from flowing into the pressure chamber through the first air passage. A first thrust spring is connected to the second end of the first valve core. A second air storage chamber is formed between the first end of the second valve core and the male connector. The second air storage chamber is connected to the air compression chamber through a second air passage. A second thrust spring is connected to the second end of the second valve core. The second end of the second valve core and the male connector form an air guide chamber that communicates with the air filling chamber. The second valve core has an air passage gap that connects the air guide chamber and the second air storage chamber. The second valve core can block or open the air passage gap. When the air pressure in the second air chamber is equal to the air pressure in the first air chamber, the second valve core blocks the air passage gap, thereby preventing air from flowing into the inflation chamber from the second air chamber. When the air pressure in the second air chamber is lower than that in the first air chamber, the second valve core opens the ventilation gap, thereby allowing air in the second air chamber to flow into the inflation chamber. An inflation channel is connected between the air guiding chamber and the inflation chamber. A second one-way valve diaphragm is provided in the inflation channel. The second one-way valve diaphragm is used to restrict the flow of air from the inflation chamber into the air guiding chamber through the inflation channel.

2. The waterproof electrical connector according to claim 1, characterized in that, The main sealing structure includes a solid sealing ring, and the outer side wall of the receiving section has an annular mounting groove, in which the sealing ring is located.

3. A waterproof electrical connector according to claim 1, characterized in that, The secondary sealing structure includes a sealing sleeve fitted on the outside of the receiving section. The sealing sleeve is elastic, and the end of the sealing sleeve is integrally connected to the receiving section. The inflation chamber is formed between the inner wall of the sealing sleeve and the outer wall of the receiving section.

4. A waterproof electrical connector according to claim 3, characterized in that, The outer wall of the sealing sleeve is provided with an integrally extended sealing lip; When the secondary sealing structure is in an expanded state, the sealing lip is conical, with the end closest to the air chamber being the larger end and abutting against the inner wall of the receiving cavity.

5. A waterproof electrical connector according to claim 3, characterized in that, An annular storage groove is provided on the outer wall of the receiving section, and the seal is fitted inside the storage groove; The male connector is sealed and slidably connected to a sliding block, and the sliding block is provided with a cover ring that can open or close the storage slot; The sliding block near the storage groove forms an auxiliary air chamber with the male connector. The auxiliary air chamber is connected to the inflation chamber. A return spring is connected to the end of the sliding block facing away from the storage groove.

6. A waterproof electrical connector according to claim 5, characterized in that, The storage tank is filled with a protective liquid that submerges the sealing sleeve.

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