A cable joint

Abstract

A cable joint comprises a middle connector, a sealing ring, a compression nut and a shrink nut, the middle connector has a sealing clamp arranged in a ring shape on one end surface, and a placing space is formed in the sealing clamp for placing the sealing ring, characterized in that the compression nut has a shaped base surface and a limiting base surface, the shaped base surface is formed with extrusion protrusions arranged in a ring shape and capable of exerting extrusion force on the sealing clamp, the inner shrinkage range of the sealing clamp under extrusion is limited by the inner diameter of the extrusion protrusions, and the limiting base surface abuts against the end part of the sealing clamp after the compression nut is screwed on the middle connector. The cable joint has the beneficial effects that the sealing clamp is driven to shrink by the extrusion protrusions to tightly clamp the sealing ring, the sealing ring, the sealing clamp and the cable are tightly adhered to each other, higher internal or external pressure can be borne, better anti-explosion performance is achieved, and the sealing ring always works in the best range of elastic deformation.

Description

Technical Field

[0001] This utility model relates to the field of cable connector technology, and in particular to a cable connector. Background Technology

[0002] Cable connectors are widely used for securing and protecting electrical wires and cables in mechanical equipment, marine electrical systems, and corrosion-resistant equipment. Waterproof cable connectors are used to lock and secure incoming and outgoing cables, providing waterproofing, dustproofing, and vibration protection.

[0003] Currently, cable connectors with sealing clamps, after the clamping nut is installed, can compress the sealing clamp inward by the clamping nut, causing it to tighten and clamp the sealing ring. Specifically, the clamping nut has a clamping flange for pressing the sealing clamp, and this flange has a tapered surface that drives the sealing clamp inward. The more downward the contact point of the sealing clamp on the tapered surface, the greater the inward contraction of the sealing clamp caused by the clamping nut, and the stronger the compressive force exerted by the sealing clamp on the sealing ring. This method drives the sealing ring to deform and tighten, achieving a tight seal with the cable. While it offers a tight fit, it has a drawback: the more the contact point of the sealing clamp on the conical surface slopes downwards, the deeper the feed depth of the clamping nut becomes (i.e., the more turns the clamping nut needs to be tightened). Although the rotational resistance increases in the later stages, users, under the misconception that tightening it more effectively results in a better seal, will continue to rotate it a certain number of turns until the rotational resistance approaches the point where the clamping nut cannot be tightened any further. Excessive tightening can cause the rubber sealing ring to be over-compressed, resulting in permanent plastic deformation and loss of elasticity, which directly affects the service life of the sealing ring. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the prior art by providing a cable connector to solve the aforementioned problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This cable connector includes a middle connector, a sealing ring, a clamping nut, and a retracting nut. One end face of the middle connector has a sealing clamp arranged in a ring shape. The sealing clamp has a placement space for the sealing ring to be placed inside. The clamping nut has a forming base surface and a limiting base surface. The forming base surface has a compression protrusion arranged in a ring shape that exerts a squeezing force on the sealing clamp. The inward retraction of the sealing clamp under compression is limited by the inner diameter of the compression protrusion. The limiting base surface abuts against the end of the sealing clamp after the clamping nut is tightened on the middle connector.

[0006] Further improvements were made, with the cross-sectional configuration of the extruded protrusion being rectangular, and an inclined surface being formed between its inner circumferential surface and inner end surface.

[0007] Further improvements were made, so that when the extrusion protrusion acts on the sealing clamp, it is located at the center-right position of the sealing clamp.

[0008] Further improvements were made, limiting the base surface to a conical shape.

[0009] Further improvements include an outer diameter of the sealing ring that gradually increases from left to right, and a ring-shaped sealing protrusion located in the center of its inner cavity, which can retract under pressure.

[0010] Further improvements were made, and the cross-sectional configuration of the sealing protrusion is composed of a semi-circular configuration and a rectangular configuration.

[0011] The beneficial effects of this utility model are:

[0012] 1. This utility model utilizes the extrusion protrusion to drive the sealing clamp to contract and clamp the sealing ring, making the sealing ring fit more tightly with the sealing clamp and the cable. It can withstand higher internal or external pressure, has better anti-burst performance, and avoids excessive compression. The sealing ring always works within its optimal range of elastic deformation, which slows down the material fatigue aging rate and extends the service life.

[0013] 2. The extrusion protrusion of this utility model has an inclined surface. When the clamping nut rotates to drive itself to move, the inclined surface can be used to guide the sealing clamp to retract inward during the movement of the clamping nut, until the sealing clamp is completely inserted into the inner ring of the extrusion protrusion. No human intervention is required, which is both convenient and quick. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the full cross-section of the present invention;

[0016] Figure 3 This utility model Figure 2 A magnified view of part A in the diagram. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Referring to the attached drawings: This cable connector includes a center connector 1, a sealing ring 2, a clamping nut 3, and a locking nut 4. One end face of the center connector 1 has a sealing clamp 11 arranged in a ring shape. The sealing clamp 11 has a space for placing the sealing ring 2. The clamping nut 3 has a forming base surface 31 and a limiting base surface 32. The forming base surface 31 has a ring-shaped extrusion protrusion 5 that exerts a squeezing force on the sealing clamp 11. The inward shrinkage of the sealing clamp 11 under compression is limited by the inner diameter of the extrusion protrusion 5. The limiting base surface 32 abuts against the end of the sealing clamp 11 after the clamping nut 3 is tightened onto the center connector 1. The principle of this invention is that after the clamping nut 3 is screwed onto the intermediate connector 1, the extrusion protrusion 5 formed on the forming base surface 31 will act first on the sealing clamp 11. The extrusion protrusion 5 is a ring structure with an inner ring, that is, the inner circumferential surface is in contact with the outer circumferential surface of the sealing clamp 11. Since the inner diameter of the extrusion protrusion 5 is smaller than the outer diameter of the sealing clamp 11 before shrinkage, the sealing clamp 11 will shrink inward to adapt to the inner diameter of the inner ring after passing through the inner ring. Moreover, the smaller the inner diameter, the greater the shrinkage of the sealing clamp 11, and the shrinkage will not cause the compression rate of the sealing ring 2 to be too large (the sealing ring 2 is static, so its compression rate can be kept below 20%). Since the pressure is concentrated on the extrusion protrusion 5, a higher local pressure can be generated, making the sealing ring 2 fit more tightly with the sealing clamp 11 and the cable, and can withstand higher internal or external pressure (for example, for cable joints or high-pressure pipeline connections in deep water), and has better anti-explosion performance. This avoids excessive compression, ensuring the sealing ring always operates within its optimal elastic deformation range, slowing down material fatigue aging and extending service life. The limiting base surface 32 abuts against the end of the sealing clamp 11 after the clamping nut 3 is rotated into position. The purpose of this abutment is twofold: firstly, to provide positioning constraints for the deformed sealing clamp 11, thus mitigating the impact of the reset reaction force generated by the sealing clamp 11 after deformation on the extrusion protrusion 5; and secondly, to make rotational resistance noticeable after abutment (i.e., making it difficult to continue increasing the feed depth). Based on the premise that the extrusion protrusion 5 ensures the contraction effect of the sealing clamp 11, the user can stop rotating the clamping nut once they feel rotational resistance. Although the extrusion protrusion 5 also generates rotational resistance when extruding the sealing clamp 11, the rotational resistance exhibited at this time is significantly less than the rotational resistance exhibited after the limiting base surface 32 of the clamping nut 3 abuts against the sealing clamp 11, and therefore will not interfere with the user's judgment. In this embodiment, the locking nut 4 retracts the cable connector when the intermediate connector 1 is installed on an object such as an electrical cabinet, so that the cable connector is fixed on the object such as the electrical cabinet.

[0019] The cross-sectional shape of the extrusion protrusion 5 is rectangular, and an inclined surface 51 is formed between its inner circumferential surface and inner end surface. This arrangement is based on the consideration that the inner diameter of the inner ring of the extrusion protrusion 5 is smaller than the outer diameter of the outer ring of the sealing clamp 11 before shrinkage. Since the sealing clamp 11 has a retractable characteristic, the inclined surface 41 allows the clamping nut 3 to rotate and move itself, and the inclined guide of the inclined surface 51 can simultaneously drive the sealing clamp 11 to shrink inward during the movement of the clamping nut 3 until the sealing clamp 11 is completely inserted into the inner ring of the extrusion protrusion 5 without human intervention. This method is both convenient and quick.

[0020] When the extrusion protrusion 5 acts on the sealing clamp 11, the extrusion protrusion 5 is located at the right-center position of the sealing clamp 11. When the extrusion protrusion 5 is located at the right-center position, it can be far away from the connection end between the sealing clamp 11 and the middle connector 1. In this way, when it acts on the sealing clamp 11, the resistance of the sealing clamp 11 to shrinkage will be reduced, so the shrinkage response will be smooth and the shrinkage amplitude will be good.

[0021] The limiting base surface 32 is a conical surface, which means that the limiting base surface 32 has an inclination, so as to adapt to the end position of the sealing clamp 11 after shrinkage.

[0022] The outer diameter of the sealing ring 2 gradually increases from left to right, and there is a sealing protrusion 21 arranged in a ring at the center of its inner cavity. The sealing protrusion 21 can retract when squeezed. This arrangement makes the outer diameter of the left end of the sealing ring 2 smaller and the outer diameter of the right end larger. So the sealing ring 2 can enter quickly when it enters the placement space formed by the sealing clamp 11. The outer diameter of the right end is adapted to the inner diameter of the sealing clamp 11. So the sealing ring 2 will not exert an outward expansion force on the sealing clamp 11 after it is fully inserted. When the clamping nut 3 applies pressure to the sealing clamp 11, the sealing clamp 11 can fully contract, so that the sealing ring 2 can also be fully squeezed and deformed.

[0023] The cross-sectional configuration of the sealing protrusion 21 consists of a semi-circular configuration and a rectangular configuration. The rectangular part provides rigidity and stability to prevent overall collapse; the semi-circular part provides elasticity and resilience, generating high and evenly distributed contact stress under clamping force, thereby achieving effective sealing. Furthermore, the good elastic recovery capability means that after multiple compressions and releases, the sealing protrusion 21 can still maintain its original shape, extending its service life.

[0024] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A cable connector, comprising a center connector (1), a sealing ring (2), a clamping nut (3), and a locking nut (4), wherein one end face of the center connector (1) has a sealing clamp (11) arranged in an annular shape, and the sealing clamp (11) has a placement space for placing the sealing ring (2) therein, characterized in that: The clamping nut (3) has a forming base surface (31) and a defining base surface (32). The forming base surface (31) has a ring-shaped extrusion protrusion (5) that exerts a squeezing force on the sealing clamp (11). The inward shrinkage of the sealing clamp (11) under compression is defined by the inner diameter of the extrusion protrusion (5). The defining base surface (32) abuts against the end of the sealing clamp (11) after the clamping nut (3) is tightened onto the middle connector (1).

2. The cable connector according to claim 1, characterized in that: The cross-sectional configuration of the extrusion protrusion (5) is rectangular, and an inclined surface (51) is formed between its inner circumferential surface and inner end surface.

3. The cable connector according to claim 2, characterized in that: When the extrusion protrusion (5) acts on the sealing clamp (11), the extrusion protrusion (5) is located at the right-center position of the sealing clamp (11).

4. The cable connector according to claim 1, characterized in that: The defined base surface (32) is a conical surface.

5. The cable connector according to claim 1, characterized in that: The outer diameter of the sealing ring (2) gradually increases from left to right, and there is a sealing protrusion (21) arranged in a ring at the center of its inner cavity. The sealing protrusion (21) can retract when squeezed.

6. The cable connector according to claim 5, characterized in that: The cross-sectional configuration of the sealing protrusion (21) consists of a semi-circular configuration and a rectangular configuration.

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