Self-temperature-limiting heat tracing cable protection joint

Abstract

The invention relates to the technical field of cable protection, and discloses a self-temperature-limiting heat tracing cable protection joint, which comprises a main connection unit and an auxiliary connection unit, the main connection unit and the auxiliary connection unit are the same in structure, the main connection unit and the auxiliary connection unit are respectively connected to two ends of a cable, and a butt-joint foundation is arranged on the main connection unit and the auxiliary connection unit; each of the main connection unit and the auxiliary connection unit comprises a butt-joint sleeve, one end of the butt-joint sleeve is connected with a traction sleeve, and the traction sleeve sleeves the butt-joint sleeve and adjusts the butt-joint sleeve to adapt to the diameter of a to-be-butt-jointed cable; the butt joint sleeve is provided with an accommodating inner cavity for a cable, and the end part of the butt joint sleeve is provided with a clamping terminal which generates angle adjustment relative to the butt joint sleeve under the action of external force. And the sleeve body is cylindrical and is sleeved on the butt joint sleeve. The problem that the working effect, the safety performance and the service life of the self-temperature-limiting heat tracing cable are affected due to the fact that the cable connector is exposed to the outside is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable protection, and particularly to a self-limiting temperature tracing cable protection joint. Background Art

[0002] The self-limiting temperature tracing cable is a new generation of unique strip-shaped constant temperature electric heater. The resistivity of its heating element has a very high positive temperature coefficient "PTC" and is connected in parallel with each other. The self-limiting temperature tracing cable can automatically limit the temperature during heating, and automatically adjust the output power according to the temperature of the heated object without any additional equipment; it can be cut arbitrarily short or extended within a certain length range, and allows multiple cross-over overlaps without the concern of high-temperature hot spots and burning.

[0003] When the self-limiting temperature tracing cable is extended for use, in order to prevent the cable joint from being exposed to the outside, which may affect the working effect, safety performance, and service life of the self-limiting temperature tracing cable. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a self-limiting temperature tracing cable protection joint, which solves the problems that the cable joint is exposed to the outside, affecting the working effect, safety performance, and service life of the self-limiting temperature tracing cable.

[0005] To achieve the above object, the present invention provides the following technical solution: A self-limiting temperature tracing cable protection joint, comprising:

[0006] A main connection unit and an auxiliary connection unit, the main connection unit and the auxiliary connection unit have the same structure, the main connection unit and the auxiliary connection unit are respectively connected to both ends of the cable, and a docking base is provided on the main connection unit and the auxiliary connection unit;

[0007] Both the main connection unit and the auxiliary connection unit include a docking sleeve, one end of the docking sleeve is connected with a traction sleeve, and the traction sleeve is sleeved on the docking sleeve to adjust the docking sleeve to adapt to the diameter of the cable to be docked;

[0008] The docking sleeve forms a receiving cavity for the cable and is provided with a clamping terminal at its end that generates an angular adjustment relative to the docking sleeve under the action of an external force;

[0009] The traction sleeve includes a sleeve body, an inner cable cavity with a diameter larger than the receiving cavity of the docking sleeve is formed inside the sleeve body, and a guiding clamping member that adapts to the diameter of the cable and generates a force on the clamping terminal after meeting the clamping terminal to guide the clamping terminal to adapt to the cable diameter is provided in the inner cable cavity;

[0010] The clamping terminal and the guiding clamping member cooperate to adapt to cables of various diameters.

[0011] In a specific embodiment, the clamping terminal includes a central plate installed on the port of the docking sleeve, a plurality of clamping arms are installed on the central plate, and a plurality of clamping arms are arranged circumferentially and equidistantly, and the outer diameter of the annular structure surrounded by the plurality of clamping arms is smaller than the outer diameter of the docking sleeve, and the inner diameter thereof is equal to the inner diameter of the docking sleeve;

[0012] The clamping arm includes a connecting section connected to the ring plate and an acting section acting on the cable surface. The acting section and the connecting section are both arranged in a strip shape, and chamfers are cut symmetrically on the cut-off surface of the acting section. The bottom surface of the acting section is arranged in an inclined plane shape to expand the area when it is connected with the cable surface.

[0013] In a specific embodiment, the guide clamping member includes a traction plate installed on the inner wall of the sleeve body, the traction plate is arranged in an inclined shape on the inner wall of the sleeve body, the adjustment of the angle between the traction plate and the sleeve body is controlled by an elastic member, and wing plates are installed on the left and right sides of the traction plate, the wing plates are arranged in parallel along the inclined angle of the traction plate and the extension width thereof gradually decreases from the back to the front;

[0014] The traction plate is provided with an overflow cavity, which is connected to the wing plate through notches on the left and right side walls of the traction plate. An overflow groove is provided on the bottom surface of the wing plate, and the overflow groove is connected to the notch through a through groove on the side wall of the wing plate.

[0015] In a specific embodiment, the sleeve body is provided with an overflow port adapted to the overflow inner cavity at the port screwed onto the docking sleeve structure, and an end piece for establishing or releasing the connection between the overflow port and the outside is installed on the sleeve body;

[0016] The end piece rotates on the sleeve body and its inner diameter is larger than the inner diameter of the sleeve body. The end piece includes a ring plate arranged on the sleeve body, the ring plate extends toward the end face of the sleeve body's gas overflow port, and an end plate extending toward the center line direction of the sleeve body port is installed on the side wall of the extended cut-off face, and the size of the end plate is adapted to the size of the gas overflow port;

[0017] The sleeve body is provided with an annular groove adapted to fit the convex ring convexly arranged on the end plate to guide the rotation of the ring plate on the sleeve body.

[0018] In a specific embodiment, it is described that the butt joint sleeves of the main connection unit and the auxiliary connection unit include a butt joint end connected to the clamping arm and an extension end extending away from the clamping arm.

[0019] In a specific embodiment, a connecting thread groove is provided on both the butt end and the extension end of the auxiliary connection unit, and the connecting thread groove provided on the butt end is adapted to the internal thread of the sleeve body;

[0020] A connecting thread groove is provided on the butt joint end of the main connecting unit, and a diameter of the extending end is larger than that of the butt joint end and a thread is convexly provided on the inner wall of the extending end.

[0021] In a specific embodiment, it is described that the extension end in the main connection unit is sleeved on the extension end in the auxiliary connection unit.

[0022] Compared with the prior art, the present invention provides a self-limiting temperature tracing cable protection joint, which has the following beneficial effects:

[0023] In the technical solution disclosed by the present invention, the main connection unit and the auxiliary connection unit are arranged on the cable joint. While protecting the cable joint, a connection basis between two cable joints is established. At the same time, based on the same structural settings of the main connection unit and the auxiliary connection unit, it is possible to reduce the cost of mold opening for the main connection unit and the auxiliary connection unit during production, increase production efficiency, and improve the adaptability of the structural parts between the main connection unit and the auxiliary connection unit for mutual replacement.

[0024] Based on the different production requirements resulting from the different diameters of the cables to be operated, the structure described in this solution makes up for the problem of different production requirements for different diameter cables. It is respectively provided with a clamping terminal and a guiding clamping member inside the docking sleeve and the traction sleeve, so as to be able to produce a double-layer clamping effect on the cables entering the inside of the docking sleeve and the traction sleeve, thereby improving the adaptability to different diameter cables.

[0025] Based on the structural settings of the main connection unit and the auxiliary connection unit, a clamping cavity with the cable surface is formed during the process of clamping the cable. In this cavity, water vapor condensation on the main connection unit or the auxiliary connection unit is likely to occur due to the internal and external temperature difference. Based on this, an air overflow inner cavity is provided on the structure body of the guiding clamping member, so as to make the temperature exchange between the clamping cavity and the outside reach consistency through the air overflow inner cavity. In addition, for the purpose of preventing the reverse entry of water vapor, an end piece for opening or closing the air overflow port is provided on the docking sleeve, improving the protection effect on the cable joint inside the main connection unit or the attached unit.

[0026] In summary, the problem that the cable joint is exposed to the outside, affecting the working effect, safety performance, and service life of the self-limiting temperature tracing cable is thus solved. At the same time, the adaptability to several diameter cables in the structure provided by this solution will be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an isometric schematic diagram of the overall structure of a self-limiting temperature tracing cable protection joint of the present invention;

[0028] Figure 2 It is an exploded schematic diagram of the structure of the auxiliary connection unit of a self-limiting temperature tracing cable protection joint of the present invention;

[0029] Figure 3 It is a schematic diagram of the clamping terminal and the traction sleeve of a self-limiting temperature tracing cable protection joint of the present invention;

[0030] Figure 4 Schematic structural diagram of the guiding and clamping component of a self-limiting temperature tracing cable protection joint of the present invention;

[0031] Figure 5 Cross-sectional view of the traction plate of a self-limiting temperature tracing cable protection joint of the present invention;

[0032] Figure 6 Schematic structural diagram of the clamping arm of a self-limiting temperature tracing cable protection joint of the present invention.

[0033] In the figure: 1, main connection unit; 2, auxiliary connection unit; 3, docking sleeve; 31, docking end; 32, extension end; 33, connecting thread groove; 4, traction sleeve; 41, sleeve body; 42, cable passing inner cavity; 43, air overflow port; 44, annular groove; 5, clamping terminal; 51, middle plate; 52, clamping arm; 521, connection section; 522, acting section; 6, guiding and clamping component; 61, traction plate; 62, elastic component; 63, wing plate; 64, air overflow inner cavity; 65, notch; 66, air overflow groove; 67, through groove; 68, end piece; 681, annular plate; 682, end plate. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1 - 6, the problem addressed by the embodiments of the present invention is as follows: The self-limiting temperature tracing cable is the only new-generation strip-shaped constant-temperature electric heater. The resistivity of its heating element has a very high positive temperature coefficient "PTC" and is connected in parallel. The self-limiting temperature tracing cable can automatically limit the temperature during heating and automatically adjust the output power according to the temperature of the heated object without any additional equipment. It can be cut arbitrarily or extended within a certain length range and allows multiple cross-over and overlap without the concern of high-temperature hot spots or burnout. When extending the use of the self-limiting temperature tracing cable, based on the discovery in the existing use process, the cable joint is exposed externally, affecting the working effect, safety performance, and service life of the self-limiting temperature tracing cable. Thus, there is an inspiration for thinking based on the structure described in this solution. This solution proposes a protective joint for the self-limiting temperature tracing cable. In this solution, the main connection unit 1 and the auxiliary connection unit 2 are arranged on the cable joint. While protecting the cable joint, it also establishes a connection basis between the two cable joints. At the same time, based on the same structural settings of the main connection unit 1 and the auxiliary connection unit 2, it can reduce the cost of die opening for the main connection unit 1 and the auxiliary connection unit 2 during production, increase production efficiency, and improve the adaptability of the structural parts between the main connection unit 1 and the auxiliary connection unit 2 for mutual replacement.

[0036] A protective joint for a self-limiting temperature tracing cable specifically described in this solution includes a main connection unit 1 and an auxiliary connection unit 2. Their structures are the same, but based on the possibility of mutual connection on the basis of connecting the two ends of the cable, the diameter of a certain structural body in the main connection unit 1 and the attached unit is different, so that a socketing relationship can be generated to achieve the purpose of mutual connection. Both the main connection unit 1 and the auxiliary connection unit 2 include a docking sleeve 3. One end of the docking sleeve 3 is connected with a traction sleeve 4. The traction sleeve 4 is sleeved on the docking sleeve 3 and adjusts the docking sleeve 3 to adapt to the diameter of the cable to be docked. The traction sleeve 4 includes a sleeve body 41. The sleeve body 41 is cylindrically sleeved on the docking sleeve 3. An inner cable cavity 42 with a diameter larger than the accommodating cavity of the docking sleeve 3 is established inside the sleeve body 41. Specifically, the differences between the main connection unit 1 and the attached unit are concentrated on the docking sleeve 3. The docking sleeves 3 of both the main connection unit 1 and the auxiliary connection unit 2 include a docking end 31 connected to the clamping arm 52 and an extension end 32 extending in the direction away from the clamping arm 52. Connecting threaded grooves 33 are provided on both the docking end 31 and the extension end 32 in the auxiliary connection unit 2. The connecting threaded groove 33 provided on the docking end 31 is adapted to the internal thread of the sleeve body 41. A connecting threaded groove 33 is provided on the docking end 31 in the main connection unit 1, and the extension end 32 is set to have a diameter larger than that of the docking end 31 and has a thread protruding from its inner wall. The extension end 32 in the main connection unit 1 is sleeved on the extension end 32 in the auxiliary connection unit 2. Thus, after the main connection unit 1 as a whole or the attached unit as a whole wraps and connects the exposed cable joint, a threaded connection is generated by the diameter difference of the extension end 32 in the docking sleeve 3. That is, in this way, the docking of the cable is completed.

[0037] Due to the different production requirements caused by the different diameters of the working cables, the clamping terminal 5 provided in the docking sleeve 3 described in this solution makes up for the problem of different production requirements for cables with different diameters. The docking sleeve 3 establishes an accommodating inner cavity for the cable and is provided with a clamping terminal 5 at its end that generates an angular adjustment relative to the docking sleeve 3 under the action of an external force. The clamping terminal 5 includes a central plate 51 installed on the port of the docking sleeve 3. A number of clamping arms 52 are installed on the central plate 51. A number of clamping arms 52 are arranged at equal circumferential intervals. The outer diameter of the annular structure surrounded by the number of clamping arms 52 is smaller than the outer diameter of the docking sleeve 3, and its inner diameter is equal to the inner diameter of the docking sleeve 3. The clamping arm 52 includes a connecting section 521 connected to the ring plate 681 and an acting section 522 acting on the surface of the cable. Both the acting section 522 and the connecting section 521 are strip-shaped. Chamfers are cut symmetrically left and right on the cross section of the acting section 522. The bottom surface of the acting section 522 is arranged as an inclined plane to expand the area when it contacts the surface of the cable. The connecting section 521 of the clamping arm 52 is arranged as a flexible structure, and it can bend at a certain angle under the action of an external force. Thus, the end of the acting section 522 gradually fits the surface of the cable based on the bending of the connecting section 521 until the cable is clamped.

[0038] In order to be able to generate an external force on the clamping terminal 5 so that it fits the surface of the cable under the action of the force to produce a clamping effect, the clamping terminal 5 and the guiding clamping member 6 cooperate to adapt to cables of various diameters. This solution is realized by using the guiding clamping member 6. The cable-passing inner cavity 42 in the sleeve body 41 is provided with a guiding clamping member 6 that adapts to the diameter of the cable and generates a force on the clamping terminal 5 after meeting the clamping terminal 5 to guide the clamping terminal 5 to adapt to the cable diameter. The guiding clamping member 6 includes a traction plate 61 installed on the inner wall of the sleeve body 41. The traction plate 61 is arranged obliquely with the inner wall of the sleeve body 41. The adjustment of the angle between the traction plate 61 and the sleeve body 41 is controlled by an elastic member 62. Wing plates 63 are installed on the left and right sides of the traction plate 61. The wing plates 63 are arranged parallel to the inclined angle of the traction plate 61 and their extending width from back to front gradually decreases to avoid movement interference when a number of traction plates 61 move centripetally towards the center of the sleeve body 41 under the action of a force. The clamping terminal 5 and the guiding clamping member are respectively arranged inside the docking sleeve 3 and the sleeve body 41, and thus a double clamping effect can be produced on the cable entering the inside of the docking sleeve 3 and the sleeve body 41, thereby improving the adaptability to cables of different diameters.

[0039] Based on the structural setting of the main connection unit 1 and the auxiliary connection unit 2, a clamping cavity with the cable surface is generated during the process of clamping the cable. In this cavity, due to the temperature difference between the inside and the outside, it is easy to cause condensation of water vapor on the main connection unit 1 or the auxiliary connection unit 2. Based on this, this scheme is provided with an overflow cavity 64 on the structure of the guide clamping action member 6, so that the temperature exchange between the clamping cavity generated by the overflow cavity 64 and the outside is consistent. An overflow cavity 64 is provided on the traction plate 61, and the overflow cavity 64 is connected to the wing plate 63 through the notches 65 provided on the left and right side walls of the traction plate 61. An overflow groove 66 is provided on the bottom surface of the wing plate 63, and the overflow groove 66 is connected to the notch 65 through the through groove 67 provided on the side wall of the wing plate 63. An overflow port 43 adapted to the overflow cavity 64 is provided at the port where the sleeve 41 is screwed onto the docking sleeve 3 structure.

[0040] For the purpose of preventing water vapor from flowing back, an end piece 68 for establishing or releasing the connection between the overflow port 43 and the outside world is installed on the sleeve body 41, so as to improve the protection effect of the cable joint in the main connection unit 1 or the attached unit. The end piece 68 rotates on the sleeve body 41 and its inner diameter is larger than the inner diameter of the sleeve body 41. The end piece 68 includes a ring plate 681 arranged on the sleeve body 41, and the ring plate 681 extends toward the end face of the overflow port 43 of the sleeve body 41, and an end plate 682 extending toward the center line direction of the port of the sleeve body 41 is installed on the side wall of its extended cut-off face, and the size of the end plate 682 is adapted to the size of the overflow port 43. An annular groove 44 is opened on the sleeve body 41 to adapt to the convex ring convexly arranged on the end plate 682 to guide the rotation of the ring plate 681 on the sleeve body 41, and the ring plate 681 on the sleeve body 41 is based on manual operation of the operator.

[0041] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-limiting temperature heating cable protective joint, characterized in that: include: A main connection unit (1) and an auxiliary connection unit (2), wherein the main connection unit (1) and the auxiliary connection unit (2) have the same structure, the main connection unit (1) and the auxiliary connection unit (2) are respectively connected to two ends of the cable, and a base for connection is provided on the main connection unit (1) and the auxiliary connection unit (2); The main connection unit (1) and the auxiliary connection unit (2) both include a docking sleeve (3), one end of which is connected to a traction sleeve (4), the traction sleeve (4) is sleeved on the docking sleeve (3) and the docking sleeve (3) is adjusted to adapt to the diameter of the cable to be docked; The butt joint sleeve (3) establishes an inner cavity for accommodating the cable and is provided at its end with a clamping terminal (5) which is subjected to an external force to produce an angle adjustment relative to the butt joint sleeve (3); The traction sleeve (4) is in a cylindrical shape and is sleeved on the docking sleeve (3). The traction sleeve (4) comprises a sleeve body (41). A cable passing cavity (42) having a diameter larger than that of the accommodating cavity of the docking sleeve (3) is established inside the sleeve body (41). A guide clamping member (6) is provided in the cable passing cavity (42) which is adaptive to the cable diameter and generates a force on the clamping terminal (5) after meeting the clamping terminal (5) to guide the clamping terminal (5) to adapt to the cable diameter. The clamping terminal (5) cooperates with the guide clamping member (6) to adapt to cables of various diameters.

2. A self-limiting temperature heating cable protective joint according to claim 1, characterized in that: The clamping terminal (5) comprises a central plate (51) mounted on the port of the docking sleeve (3), a plurality of clamping arms (52) being mounted on the central plate (51), a plurality of clamping arms (52) being arranged equidistantly in a circular direction, and an annular structure surrounded by the plurality of clamping arms (52) having an outer diameter smaller than the outer diameter of the docking sleeve (3) and an inner diameter equal to the inner diameter of the docking sleeve (3); The clamping arm (52) comprises a connecting section (521) connected to the ring plate (681) and an acting section (522) acting on the surface of the cable. The acting section (522) and the connecting section (521) are both arranged in a strip shape. The cut-off surface of the acting section (522) is symmetrically cut with chamfers. The bottom surface of the acting section (522) is arranged in an inclined plane shape to expand the area when it is in contact with the cable surface.

3. The self-limiting temperature heating cable protective joint according to claim 1 is characterized in that: The guide clamping member (6) comprises a traction plate (61) mounted on the inner wall of the sleeve (41), the traction plate (61) and the inner wall of the sleeve (41) are arranged in an inclined shape, the adjustment of the angle between the traction plate (61) and the sleeve (41) is controlled by an elastic member (62), and wing plates (63) are mounted on the left and right sides of the traction plate (61), the wing plates (63) are arranged parallel to the inclined angle of the traction plate (61), and the extension width thereof from the back to the front gradually decreases; The traction plate (61) is provided with an overflow cavity (64), the overflow cavity (64) is connected to the wing plate (63) via notches (65) provided on the left and right side walls of the traction plate (61), an overflow groove (66) is provided on the bottom surface of the wing plate (63), and the overflow groove (66) is connected to the notch (65) via a through groove (67) provided on the side wall of the wing plate (63).

4. A self-limiting temperature heating cable protective joint according to claim 3, characterized in that: The sleeve body (41) is provided with an overflow port (43) adapted to the overflow inner cavity (64) at the port screwed onto the docking sleeve (3) structure, and an end piece (68) is installed on the sleeve body (41) to establish or release the connection between the overflow port (43) and the outside world; The end piece (68) is rotated on the sleeve (41) and has an inner diameter greater than the inner diameter of the sleeve (41). The end piece (68) includes a ring plate (681) arranged on the sleeve (41). The ring plate (681) extends toward the end surface of the overflow port (43) of the sleeve (41), and an end plate (682) extending toward the center line direction of the port of the sleeve (41) is installed on the side wall of the extended cut-off surface. The size of the end plate (682) is adapted to the size of the overflow port (43). The sleeve body (41) is provided with an annular groove (44) adapted to fit a convex ring provided on the end plate (682) to guide the rotation of the annular plate (681) on the sleeve body (41).

5. The self-limiting temperature heating cable protective joint according to claim 1 is characterized in that: The butt-jointed sleeves (3) of the main connection unit (1) and the auxiliary connection unit (2) comprise a butt-jointed end (31) connected to the clamping arm (52) and an extended end (32) extending away from the clamping arm (52).

6. The self-limiting temperature heating cable protective joint according to claim A is characterized in that: The butt end (31) and the extension end (32) of the auxiliary connection unit (2) are both provided with a connecting thread groove (33), and the connecting thread groove (33) provided on the butt end (31) is adapted to the internal thread of the sleeve body (41); A connecting thread groove (33) is provided on the butt end (31) of the main connection unit (1), and the extension end (32) is arranged with a diameter larger than the butt end (31) and a thread is protruding on the inner wall thereof.

7. The self-limiting temperature heating cable protective joint according to claim 5 is characterized in that: The extension end (32) in the main connection unit (1) is sleeved on the extension end (32) in the auxiliary connection unit (2).

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