A sealing structure of an electrical connector and a circular electrical connector

Abstract

The utility model discloses a kind of sealing structure and circular electric connector of electric connector, comprising: sealing gasket and not less than two O-shaped sealing ring;The first gap space that is formed to socket assembly opening between the plug shell of plug assembly and connecting ring, the plug shell outside of this first gap space is provided with O-shaped sealing ring, and O-shaped sealing ring has gap with connecting ring;Sealing gasket is arranged between socket shell and pin base;When plug assembly is inserted with socket assembly, the left end of socket shell is inserted into the first gap space, the left end of socket shell is respectively abutted with O-shaped sealing ring and connecting ring, to realize the first place sealing of plug assembly and socket assembly;Sealing gasket is abutted with the right end of plug shell, to realize the second place sealing of plug assembly and socket assembly.The circular electric connector of the utility model can realize sealing, and have the characteristics such as simple structure, reliable performance, low in cost, short production cycle and easy to use.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, specifically, to a sealing structure for an electrical connector and a circular electrical connector. Background Technology

[0002] As a critical interface component in electrical systems, the sealing performance of electrical connectors directly affects the reliability and lifespan of equipment in complex environments. Currently, commonly used sealing methods for electrical connectors mainly include the following:

[0003] 1. O-rings are used to achieve a seal between the plug and socket, as well as at the panel mounting area. This method has advantages such as high versatility, low cost, easy replacement, and short production cycle for standard parts, making it suitable for various common sealing applications.

[0004] 2. The interface gasket achieves a seal between the plug and the socket. The interface gasket seal has the characteristics of excellent performance, integrated structure and high reliability, and is suitable for application environments with certain requirements for sealing performance.

[0005] 3. The connector's tail and internal structure are sealed using potting. Potting provides the highest level of sealing and excellent tensile strength, but its structure is not removable and is generally used in applications requiring high protection levels.

[0006] 4. Absolute airtightness between the metal casing and the pins is achieved through glass sintering sealing, which has excellent resistance to high and low temperature impacts. However, this process is costly and is usually used in applications with extremely strict airtightness requirements.

[0007] 5. Laser welding is used for sealing. This method has high sealing performance and high connection strength, and is a non-removable sealing method. However, the process is complex and the cost is relatively high.

[0008] While existing sealing technologies can meet the requirements of normal environments, such as withstand voltage up to 5000V DC / 1min, the sealing capabilities of conventional electrical connectors are still insufficient in certain special applications, such as underwater environments up to 300 meters deep. These deep-water environments place higher demands on the connector's voltage withstand capability, sealing rating, and environmental adaptability. Therefore, it is necessary to improve the structure or materials of existing electrical connector technologies to enhance their sealing performance in deep-water environments and meet customers' needs for high product reliability and adaptability to special operating conditions. Utility Model Content

[0009] To address the aforementioned technical problems, the present invention aims to provide a sealing structure for an electrical connector and a circular electrical connector that improves sealing performance without altering the product's external dimensions, meeting the high-voltage (5000V DC / 1min) requirements at a depth of 300 meters underwater. Furthermore, the design is simple, reliable, low-cost, has a short production cycle, and is easy to use.

[0010] The present invention solves the above problems through the following technical solution:

[0011] A sealing structure for an electrical connector, disposed on a plug assembly and a socket assembly, includes: a sealing gasket and at least two O-rings; the plug assembly includes: a plug housing and a connecting ring disposed outside the plug housing, a first gap space is formed between the plug housing and the connecting ring opening into the socket assembly, a second groove and a third groove are formed outside the plug housing in the first gap space to accommodate at least two O-rings, and there is a gap between the O-rings disposed in the second groove and the third groove and the connecting ring; the socket assembly includes: a socket housing and a pin base sealed inside the socket housing, the sealing gasket being disposed between the socket housing and the pin base; when the plug assembly and the socket assembly are plugged in, the left end of the socket housing is inserted into the first gap space, and the inner and outer sides of the left end of the socket housing abut against the O-rings and the connecting ring respectively to achieve a first seal between the plug assembly and the socket assembly; the sealing gasket abuts against the right end of the plug housing to achieve a second seal between the plug assembly and the socket assembly.

[0012] As a further improvement, a sealing gasket is provided inside the pin base to achieve a seal between the pin base and the socket base inside the plug assembly.

[0013] As a further improvement, the socket housing extends outward to form a conductive sealing ring mounting groove that opens to the left, and a conductive sealing ring is disposed in the conductive sealing ring mounting groove.

[0014] Furthermore, this utility model also solves the above problems through the following technical solutions:

[0015] A circular electrical connector includes a plug assembly and a socket assembly that are mated together, and is provided with a sealing structure as described above for an electrical connector.

[0016] As a further improvement, the plug assembly also includes: a sheath, a socket assembly, and a socket base. A first groove is provided on the outer left end of the plug housing, and the sheath mates with the first groove to cover and fit the sheath onto the left end of the plug housing. A first limiting protrusion, a second groove, and a third groove are formed sequentially from left to right on the outer middle part of the plug housing. A connecting ring is fitted onto the middle part of the plug housing, and a second limiting protrusion and a fourth groove are formed inside the connecting ring. When the connecting ring is installed in the middle part of the plug housing, the second limiting protrusion is located to the left of the first limiting protrusion, and the first limiting protrusion is located inside the fourth groove. The two O-rings are respectively disposed in the second groove and the third groove.

[0017] The plug housing has a socket receiving space inside, and a socket base is provided on the right side of the socket receiving space. The socket assembly is located in the socket base. The left side of the socket receiving space is potted and covered by a protective sleeve.

[0018] As a further improvement, the socket assembly further includes: a pin and a tail cap connected to a single-core cable; a pin receiving space is formed inside the socket housing, and a pin base is provided in the pin receiving space. The left radius of the pin receiving space is larger than that of the right part of the pin receiving space, so that the right part of the pin base fits tightly with the right part of the pin receiving space. There is a second gap space between the left part of the pin base and the left part of the pin receiving space, and a sealing gasket is embedded in the second gap space; several single-core cables are disposed in the pin receiving space through the tail cap that covers the right end of the socket housing, and the pins connecting the single-core cables pass through the pin mounting holes in the pin base. A sealing gasket is provided between the pin mounting holes and the outer wall of the pin base; the right part of the pin receiving space is potted and covered by the tail cap.

[0019] As a further improvement, a hexagonal nut, a locking washer, and a flat washer are sequentially provided on the outside of the socket housing.

[0020] As a further improvement, when the plug assembly and the socket assembly are plugged in, there is a gap between the inner side of the socket housing and the outer side of the plug housing, the gap height being 0.05mm to 0.15mm; and / or the O-ring has a hardness of Shore A 70.

[0021] As a further improvement, the potting process inside the socket housing and plug housing is performed using epoxy resin; and / or the end cap of the socket housing and / or the sheath of the plug assembly are manufactured by injection molding.

[0022] As a further improvement, the socket housing and / or plug housing are made of 316L stainless steel and their surfaces are pickled and passivated.

[0023] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0024] (1) This utility model inserts the socket housing into the first gap space of the plug assembly and simultaneously compresses the two O-rings to form two independent radial sealing barriers. Even if one of them fails due to minor damage or accidental factors, the other can still maintain a seal, greatly reducing the risk of single-point failure. Furthermore, the sealing gasket inside the socket assembly is in close contact with the end face of the plug housing to form an independent axial sealing barrier. This combination of radial and end face sealing forms a three-dimensional, multi-layered sealing system, which can more effectively prevent moisture, dust and other media from entering from different paths, achieving multiple independent seals and significantly improving the overall sealing reliability.

[0025] (2) This utility model precisely matches the material properties of the selected O-ring with a Shore hardness of 70 by strictly controlling the critical structural gap height C value to 0.1mm. This design effectively prevents the risk of the O-ring being squeezed into the gap and causing "extrusion damage" under working pressure of 3MPa or even higher pressure (up to 7MPa), fundamentally ensuring the long-term stability and lifespan of the sealing structure under high pressure.

[0026] (3) This utility model utilizes the natural first gap space formed between the plug housing and the connecting ring to accommodate the socket housing, resulting in a compact structure that requires no additional space. Furthermore, the O-ring is accommodated within the slot and maintains a gap with the external connecting ring, providing good protection before and after insertion and reducing the possibility of accidental bumps and damage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a circular electrical connector plug according to the present invention;

[0028] Figure 2 This is a schematic diagram of the plug assembly and socket assembly of this utility model after installation;

[0029] Figure 3 This is a schematic diagram of the plug assembly of this utility model;

[0030] Figure 4 This is a schematic diagram of the socket assembly of this utility model;

[0031] Figure 5 This is a schematic diagram showing the state of the O-ring seal when the pressure P is 0.

[0032] Figure 6 This is a schematic diagram showing the state of the O-ring seal when the pressure P is greater than 0 and less than Pmax (3MPa).

[0033] Figure 7This is a schematic diagram showing the state of the O-ring seal when the pressure P is greater than Pmax (3MPa).

[0034] Reference numerals: 01, plug assembly; 101, plug housing; 102, connecting ring; 1021, second limiting protrusion; 1022, fourth slot; 103, sheath; 104, socket assembly; 105, socket base; 106, O-ring seal; 107, first slot; 108, first limiting protrusion; 109, second slot; 110, third slot; 02, socket assembly; 201, socket housing; 202, hexagonal nut; 203, locking washer; 204, flat washer; 205, tail cap; 206, single-core cable; 207, pin base; 208, sealing gasket; 209, sealing gasket; 210, conductive sealing ring; 211, pin mounting hole; 212, pin. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Example 1:

[0037] See attached document Figure 1-4 A sealing structure for an electrical connector is provided on a plug assembly 01 and a socket assembly 02, comprising: a sealing gasket 209 and not less than two O-rings 106.

[0038] The plug assembly 01 includes: a plug housing 101 and a connecting ring 102 connected to the outside of the plug housing 101. A first gap space is formed between the plug housing 101 and the connecting ring 102, which opens into the socket assembly 02. The plug housing 101 outside the first gap space has a second slot 109 and a third slot 110 for accommodating not less than two O-rings 106. The O-rings 106 disposed in the second slot 109 and the third slot 110 have a gap with the connecting ring 102.

[0039] The socket assembly 02 includes: a socket housing 201 and a pin base 207 sealed within the socket housing 201, with a sealing gasket 209 disposed between the socket housing 201 and the pin base 207;

[0040] When the plug assembly 01 is plugged into the socket assembly 02, the left end of the socket housing 201 is inserted into the first gap space, and the inner and outer sides of the left end of the socket housing 201 abut against the O-ring 106 and the connecting ring 102 respectively to achieve the first seal between the plug assembly 01 and the socket assembly 02; the sealing gasket 209 abuts against the right end of the plug housing 101 to achieve the second seal between the plug assembly 01 and the socket assembly 02.

[0041] Optionally, a sealing gasket 208 is provided inside the pin base 207 to achieve a seal between the pin base 207 and the socket base 105 inside the plug assembly 01. The socket housing 201 extends outward to form a conductive sealing ring mounting groove that opens to the left, and a conductive sealing ring 210 is provided inside the conductive sealing ring mounting groove.

[0042] Example 2:

[0043] See attached document Figure 1-4 A circular electrical connector plug, having a sealing structure for the electrical connector, includes: a plug assembly and a socket assembly for mating;

[0044] The plug assembly 01 includes: a plug housing 101, a connecting ring 102, a sheath 103, a socket assembly 104, a socket base 105, and an O-ring 106. A first groove 107 is provided on the outer left end of the plug housing 101. A sheath limiting portion inside the sheath 103 cooperates with the first groove 107 to cover and fit the sheath 103 onto the left end of the plug housing 101. From left to right, a first limiting protrusion 108, a second groove 109, and a third groove 110 are sequentially formed on the outer middle portion of the plug housing 101. The connecting ring 102 is fitted onto the middle portion of the plug housing 101, and a second limiting protrusion is formed within the connecting ring 102. The connecting ring 102 is limited by the first limiting protrusion 108 and the sheath, and is threadedly connected to the socket housing. When the connecting ring 102 is installed in the middle of the plug housing 101, the second limiting protrusion 1021 is located to the left of the first limiting protrusion 108, the first limiting protrusion 108 is located in the fourth groove 1022, and the two O-rings 106 are respectively set in the second groove 109 and the third groove 110. The remaining part of the connecting ring, except for the part of the second limiting protrusion 1021, has a first gap space with the plug housing and the two O-rings 106.

[0045] The plug housing has a socket receiving space inside. A socket base 105 is provided on the right side of the socket receiving space, and the socket assembly 104 is inserted into the socket base 105. The left side of the socket receiving space is potted and covered by a protective sleeve 103 to serve as a waterproofing measure.

[0046] The socket assembly 02 includes: a socket housing 201, a hexagonal nut 202, a locking washer 203, a flat washer 204, a tail cap 205, a single-core cable 206, a pin base 207, a sealing gasket 208, a sealing gasket 209, and a conductive sealing ring 210, etc. Among them, the hexagonal nut 202, the locking washer 203, and the flat washer 204 are sequentially and tightly fitted on the outer side of the middle of the socket housing 201. The hexagonal nut 202 serves to fasten the socket assembly, the locking washer 203 prevents the hexagonal nut 202 from loosening under vibration and impact, and the flat washer 204 protects the panel of the installed equipment and prevents scratches and damage to the surface plating.

[0047] The right end of the socket housing 201 extends outward to form a conductive sealing ring mounting groove with a forward opening. The conductive sealing ring 210 is set in the conductive sealing ring mounting groove. After installation, the interface of the socket housing and the mounting surface of the equipment or device are sealed, thus solving the problem of waterproofing and dustproofing. The socket housing 201 has a pin receiving space inside. A pin base 207 is provided between the left and right parts of the pin receiving space. The radius of the left part of the pin receiving space is larger than that of the right part of the pin receiving space so that the right part of the pin base 207 fits tightly with the right part of the pin receiving space. There is a second gap space between the left part of the pin base 207 and the left part of the pin receiving space. A sealing gasket 209 is embedded in the second gap space. Several single-core cables 206 are provided in the pin receiving space through a tail cap 205 covering the right end of the socket housing 201. The pins of the single-core cables 206 pass through the pin mounting holes 211 in the pin base 207. A sealing gasket 208 is provided between the pin mounting holes 211 and the outer wall of the pin base 207. The left end of the pin is flush with the left end of the pin base. Preferably, the right part of the pin receiving space is potted and covered by the tail cap.

[0048] When the plug assembly 01 is plugged into the socket assembly 02, the left end of the socket housing is inserted into the first gap space between the connecting ring and the plug housing and the two O-ring seals 106, and the two O-ring seals 106 are squeezed so that the plug assembly 01 and the socket assembly 02 are brought close together by the reaction force of the two O-ring seals 106, thus achieving the first seal between the plug assembly 01 and the socket assembly 02; and the sealing gasket 209 abuts against the right end of the plug housing 101, thus achieving the second seal between the plug assembly 01 and the socket assembly 02.

[0049] The specific principle is as follows:

[0050] I. First sealing design:

[0051] Two O-rings 106 of the same size are designed on the outer ring of the plug housing. When the plug assembly 01 and the socket assembly 02 are plugged in, the inner cavity of the socket housing 101 compresses the two O-rings 106 on the outside of the plug housing, causing the O-rings 106 to deform in the radial direction, thus creating a pre-sealing effect. When the applied pressure P is equal to 0, refer to the attached... Figure 5 Because of the good elasticity of the O-ring, the O-ring 106 will automatically return to the state adjacent to the mating surface, filling the gap and forming a seal.

[0052] When the applied pressure P is greater than 0 and less than Pmax (3MPa), the O-ring 106 will be pressed against one side of the second groove 109 and / or the third groove 110O, and the O-ring 106 will deform, changing its cross-sectional shape, thereby blocking the leakage channel of the medium and achieving a sealing effect. (See attached diagram.) Figure 6 .

[0053] When the applied pressure P exceeds Pmax (3MPa), exceeding the hardness and strength of the O-ring material, excessive working pressure will force the O-ring into the gap, causing failure. (See attached...) Figure 7 Therefore, selecting the sealing gap height C under reasonable pressure is particularly important. Thus, provided that the normal mating function is met and the O-ring wire diameter and hardness are equal, the smaller the gap height value, the greater the water pressure it can withstand.

[0054] To achieve the working mode of the O-ring seal, the gap height C selected in this design is 0.05mm~0.15mm, preferably 0.1mm. According to the selection manual, when the hardness of the O-ring seal is Shore A 70, it can withstand a pressure of 7MPa, which fully meets the requirement of 3MPa.

[0055] II. Second sealing design:

[0056] A sealing gasket 209 is designed at the interface where the socket housing and the plug housing mate. When the socket housing and the plug housing are fully engaged, the end face of the plug housing compresses the sealing gasket 209 on the socket housing, thus sealing the mating surfaces. The function of the sealing gasket 209 is to ensure the waterproof sealing performance of the product even if the two O-rings 106 are damaged or fail.

[0057] During the design phase, the compression of the sealing gasket 209 was set at 25%. Tests have verified that when the sealing gasket is compressed by 25%, it can meet the water pressure requirement of 3 MPa.

[0058] III. Design of the plug tail:

[0059] The left side of plug assembly 01 is encapsulated with epoxy resin potting compound, which, after curing, provides strong sealing, structural strength, and temperature resistance, thus achieving a seal between the cable and the contact termination and the connector tail. The plug tail is fitted with polyurethane material to form a sheath, which serves as an auxiliary waterproof seal.

[0060] In an optional embodiment,

[0061] Because the plug assembly requires high-temperature pressing of the sheath at around 180℃, the potting compound used inside the plug assembly must be heat-resistant above 180℃, withstand 3MPa (equivalent to 300 meters of water depth) pressure, and have good adhesion. Heat-resistant epoxy adhesive (F-5130 / 34) and epoxy resin AB adhesive (DG-3S) are preferred.

[0062] IV. Design of the socket's tail section:

[0063] The end of the socket assembly is potted with epoxy resin.

[0064] The specific assembly method of the circular electrical connector of this utility model is as follows:

[0065] I. Installation of the plug assembly:

[0066] During assembly, the socket base 105 is first bonded to the plug housing 101 with epoxy resin. After the epoxy resin cures, the two socket assemblies 104 are bonded to the corresponding inner holes of the socket base to ensure proper installation. After curing, the two O-rings 106 are inserted into the corresponding sealing grooves, i.e., the second or third grooves, of the plug housing 101, ensuring no damage. Then, the connecting ring 102 is fitted onto the plug housing 101 along the tail, i.e., the left side. After confirming that everything is correct, the tail of the plug housing 101 is potted. After the adhesive cures, the tail of the plug housing 101 is placed into a mold for pressing the sheath 103.

[0067] II. Installation of socket components:

[0068] During assembly, firstly, the pin base 207 is bonded to the socket housing 201 with epoxy resin. After the epoxy resin has cured, the two pins 201 are bonded to the corresponding inner holes of the pin base to ensure proper installation. After curing, the sealing gasket 209 is inserted into the corresponding sealing groove of the socket housing to ensure no damage. After confirming that everything is correct, the tail end, i.e. the right side, of the socket housing 201 is potted. After the adhesive has cured, the tail cap 205 is pressed into the tail end of the socket housing 201, and then the accessories are installed into the front end of the socket housing.

[0069] Preferably, since circular electrical connectors require salt spray resistance of at least 96 hours, the socket housing 20 and / or plug housing 101 are made of 316L stainless steel, which has excellent salt spray resistance. Furthermore, after machining, the surface undergoes pickling and passivation treatment to form an oxide film on the surface of the parts, further improving the salt spray resistance of the housing.

[0070] O-rings, interlocking gaskets, sealing gaskets, and conductive sealing rings all serve as sealing elements. For circular electrical connectors, silicone rubber is the preferred material for sealing elements. This material is resistant to high and low temperatures and aging, and can fully fill all gaps under stress to achieve the required seal. This material is widely used in military electrical connectors.

[0071] The electrical connector is resistant to DC 5000V and has a small size, so the socket base and pin base, which are insulators, are made of polybutylene terephthalate (PBT) material with a high dielectric constant.

[0072] Through the above design improvements, this circular electrical connector solves the watertight requirement of 300 meters (3MPa) and provides the existing electrical connector with the characteristics of simple structure, reliable performance, low cost, short production cycle, and ease of use. The product has a dual waterproof function, which greatly improves reliability. The cavity sealing design also solves the problem of high pressure resistance under low pressure conditions, making the product more widely applicable.

[0073] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A sealing structure for an electrical connector, disposed on a plug assembly (01) and a socket assembly (02), characterized in that, include: Not less than two O-rings (106); The plug assembly (01) includes: a plug housing (101) and a connecting ring (102) disposed outside the plug housing (101). A first gap space is formed between the plug housing (101) and the connecting ring (102) opening into the socket assembly (02). A second slot (109) and a third slot (110) are formed outside the plug housing (101) of the first gap space to accommodate not less than two O-rings (106). The O-rings (106) disposed in the second slot (109) and the third slot (110) have a gap with the connecting ring (102). The socket assembly (02) includes: a socket housing (201) and a pin base (207) sealed within the socket housing (201); When the plug assembly (01) is plugged into the socket assembly (02), the left end of the socket housing (201) is inserted into the first gap space, and the left end of the socket housing (201) abuts against the O-ring (106) and the connecting ring (102) respectively, so as to achieve the first seal between the plug assembly (01) and the socket assembly (02).

2. The sealing structure of an electrical connector according to claim 1, characterized in that, A sealing gasket (209) is provided between the socket housing (201) and the pin base (207). When the plug assembly (01) and the socket assembly (02) are plugged in, the sealing gasket (209) abuts against the right end of the plug housing (101) to achieve a second seal between the plug assembly (01) and the socket assembly (02).

3. The sealing structure of an electrical connector according to claim 1, characterized in that, The pin base (207) is provided with a sealing gasket (208) to achieve a seal between the pin base (207) and the socket base (105) inside the plug assembly (01).

4. The sealing structure of an electrical connector according to claim 1, characterized in that, The socket housing (201) extends outward to form a conductive sealing ring (210) mounting groove that opens to the left, and a conductive sealing ring (210) is provided in the conductive sealing ring (210) mounting groove.

5. A circular electrical connector, characterized in that, It includes a plug assembly (01) and a socket assembly (02) that are interlocked, and is provided with a sealing structure for an electrical connector as described in any one of claims 1-4.

6. A circular electrical connector according to claim 5, characterized in that, The plug assembly (01) further includes: a sheath (103), a socket assembly (104), and a socket base (105). A first groove (107) is provided on the outer left end of the plug housing (101). The sheath (103) mates with the first groove (107) to cover the left end of the plug housing (101). A first limiting protrusion (108), a second groove (109), and a third groove (110) are formed sequentially from left to right on the outer middle part of the plug housing (101). A connecting ring (1) 02) It is fitted in the middle of the plug housing (101), and a second limiting protrusion (1021) and a fourth groove (1022) are formed in the connecting ring (102). When the connecting ring (102) is installed in the middle of the plug housing (101), the second limiting protrusion (1021) is located to the left of the first limiting protrusion (108), the first limiting protrusion (108) is located in the fourth groove (1022), and the two O-rings (106) are respectively set in the second groove (109) and the third groove (110); The plug housing (101) has a socket receiving space inside, and a socket base (105) is provided on the right side of the socket receiving space. The socket assembly (104) is located in the socket base (105); and the left side of the socket receiving space is potted and covered by a sheath (103).

7. A circular electrical connector according to claim 5, characterized in that, The socket assembly (02) further includes: a pin and a tail cap (205) connected to a single-core cable (206); The socket housing (201) has a pin receiving space inside, and a pin base (207) is provided in the pin receiving space. The left radius of the pin receiving space is larger than that of the right part of the pin receiving space so that the right part of the pin base (207) fits tightly with the right part of the pin receiving space. There is a second gap space between the left part of the pin base (207) and the left part of the pin receiving space. A sealing gasket (209) is embedded in the second gap space. Several single-core cables (206) are set in the pin receiving space through a tail cap (205) covering the right end of the socket housing (201). The pins connecting the single-core cables (206) pass through the pin mounting hole (211) in the pin base (207). A sealing gasket (208) is provided between the pin mounting hole (211) and the outer wall of the pin base (207). The right part of the pin receiving space is potted and covered by the tail cap (205).

8. A circular electrical connector according to claim 5, characterized in that, When the plug assembly (01) is plugged into the socket assembly (02), there is a gap between the inner side of the socket housing (201) and the outer side of the plug housing (101), the gap height being 0.05mm to 0.15mm; and / or the O-ring seal (106) having a hardness of Shore A 70.

9. A circular electrical connector according to claim 5, characterized in that, The potting process inside the socket housing (201) and plug housing (101) is performed using epoxy resin. The tail cap (205) of the socket housing (201) and / or the sheath (103) of the plug assembly (01) are manufactured by injection molding.

10. A circular electrical connector according to claim 5, characterized in that, The socket housing (201) and / or plug housing (101) are made of 316L stainless steel and their surfaces are pickled and passivated.

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