CN111463586A

CN111463586A - Thermal shrinkage terminal

Info

Publication number: CN111463586A
Application number: CN202010403378.1A
Authority: CN
Inventors: 浦亚芹; 韩晓明; 马腾
Original assignee: Shanghai Hanpu New Material Technology Co ltd
Current assignee: Shanghai Hanpu New Material Technology Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-07-28

Abstract

The application relates to a thermal shrinkage terminal, which comprises a connecting column, a first blind hole and a second blind hole which are respectively arranged on two end faces of the connecting column, at least two first long grooves arranged on the side wall of the connecting column, at least two second long grooves arranged on the side wall of the connecting column and a thermal shrinkage type transparent sleeve. The heat-shrinkable transparent sleeve comprises a first part sleeved on the connecting column, and a second part and a third part which respectively extend outwards from two ends of the first part, wherein a first heat-shrinkable ring is arranged on the inner wall of the second part, a second heat-shrinkable ring is arranged on the inner wall of the third part, and wet-water color-changing pigments are coated on the surfaces of the first heat-shrinkable ring and the second heat-shrinkable ring. The application is used for connecting an electric circuit, can display water vapor permeation and provides reference basis for maintenance or replacement.

Description

Thermal shrinkage terminal

Technical Field

The application relates to the technical field of wiring terminals, in particular to a thermal shrinkage terminal.

Background

The thermal shrinkage terminal is used for electric line connection and has the functions of insulation, water resistance and stress protection. Current pyrocondensation terminal is mostly the integral type structure, and the electric wire of connecting inserts the inside tubular metal resonator back from both sides, heats the pyrocondensation pipe of wrapping up outside the tubular metal resonator with heat gun or other heatable mode, makes it hug closely on the electric wire.

The heat shrinkable tube can not be completely attached to the electric wire, and in the using process, gaps between the heat shrinkable tube and the electric wire can be gradually increased along with aging of the heat shrinkable tube, and water vapor can enter the gaps after the gaps are increased, so that the performance of the joints is reduced and even the joints are failed.

Disclosure of Invention

To the not enough that prior art exists, the purpose of this application is to provide a pyrocondensation terminal, and this pyrocondensation terminal can show the steam infiltration, provides the reference basis for maintenance or change.

The above object of the present application is achieved by the following technical solutions:

a heat-shrinkable terminal comprising:

connecting columns;

the first blind hole and the second blind hole are respectively arranged on two end faces of the connecting column;

the bottom surface of the connecting column is communicated with the inner wall of the first blind hole, one end of the connecting column is a closed end, and the other end of the connecting column is communicated with the end surface where the first blind hole is located;

the bottom surface of the connecting column is communicated with the inner wall of the second blind hole, one end of the connecting column is a closed end, and the other end of the connecting column is communicated with the end face where the second blind hole is located;

the heat-shrinkable transparent sleeve comprises a first part sleeved on the connecting column, and a second part and a third part which respectively extend outwards from two ends of the first part;

the first heat-shrinkable ring is arranged on the inner wall of the second part; and

the second heat-shrinkable ring is arranged on the inner wall of the third part;

wherein, the surfaces of the first heat-shrinkable ring and the second heat-shrinkable ring are coated with wet water color-changing pigments.

Through adopting above-mentioned technical scheme, after inserting first blind hole and second blind hole respectively with two electric wires, heat the transparent sleeve pipe of heat shrink formula, the transparent sleeve pipe of heat shrink formula begins to shrink and laminates on the surface of spliced pole and electric wire, and the internal diameter of first blind hole and second blind hole of this in-process shrinks simultaneously, tightly wraps up the electric wire, and first pyrocondensation ring sum second pyrocondensation ring also can wholly or partly laminate on the surface of electric wire under the promotion of the transparent sleeve pipe of heat shrink formula simultaneously. In the use process, after water vapor permeates through a gap between the heat-shrinkable transparent sleeve and the electric wire, the water vapor is contacted with the wet color-changing pigment on the adjacent first heat-shrinkable ring or the second heat-shrinkable ring, and the wet color-changing pigment changes color. The color change can be observed through the heat-shrinkable transparent sleeve, and a reference basis is provided for maintenance or replacement.

In a preferred example of the present application: the number of the first heat-shrinkable rings is more than two;

more than two first heat-shrinkable rings are arranged on the inner wall of the second part at intervals.

Through adopting above-mentioned technical scheme, the first pyrocondensation ring more than two can form the multichannel and remind, and in the use, in the direction that is close to the spliced pole, these first pyrocondensation ring change colour in order and per two adjacent first pyrocondensation ring change colour have a time interval, can realize like this that remind many times and remind in advance, appear omitting or lagged problem easily when effectively having avoided single to remind.

In a preferred example of the present application: the number of the second heat-shrinkable rings is more than two;

more than two second heat-shrinkable rings are arranged on the inner wall of the third part at intervals.

Through adopting above-mentioned technical scheme, the second pyrocondensation ring more than two can form the multichannel and remind, and in the use, in the direction that is close to the spliced pole, these second pyrocondensation ring change colour in proper order and every two adjacent second pyrocondensation ring change colour have a time interval, can realize like this reminding many times and remind in advance, appear omitting or lagged problem when effectively having avoided single to remind easily.

In a preferred example of the present application: the length of the first long groove is 0.7-0.9 times of the depth of the first blind hole.

By adopting the technical scheme, a distance is reserved between one end of the first long groove close to the first blind hole and the bottom of the first blind hole, and the head of the electric wire connected with the first long groove can be completely wrapped.

In a preferred example of the present application: the width of the first long groove tends to decrease in a direction approaching the bottom surface of the first blind hole.

Through adopting above-mentioned technical scheme, can make the laminating of the lateral wall of first blind hole and electric wire inseparabler.

In a preferred example of the present application: the length of the second long groove is 0.7-0.9 times of the depth of the second blind hole.

By adopting the technical scheme, a distance is reserved between the two ends of the second long groove close to the second blind hole and the bottom of the second blind hole, and the head of the electric wire connected with the second long groove can be completely wrapped.

In a preferred example of the present application: the width of the second long groove tends to decrease in a direction approaching the bottom surface of the second blind hole.

Through adopting above-mentioned technical scheme, can make the laminating of the lateral wall of second blind hole and electric wire inseparabler.

In a preferred example of the present application: the first heat-shrinkable ring comprises more than two first arc-shaped parts;

more than two first arc-shaped parts can be enclosed into a ring shape, and the maximum outer diameter of the ring shape is smaller than the inner diameter of the second part.

Through adopting above-mentioned technical scheme, first pyrocondensation ring comprises a plurality of disconnected first arc parts, exists the clearance between the adjacent first arc part, and at the in-process that the transparent sleeve pipe of heat shrink formula contracts, these first arc parts can move and the laminating on the surface of electric wire tightly along with the transparent sleeve pipe of heat shrink formula, and is inseparabler with the laminating of electric wire, further reduces the gap width between the transparent sleeve pipe of heat shrink formula and the electric wire.

In a preferred example of the present application: the second heat shrink ring comprises more than two second arc-shaped parts;

more than two second arc-shaped parts can be enclosed into a ring shape, and the maximum outer diameter of the ring shape is smaller than the inner diameter of the third part.

Through adopting above-mentioned technical scheme, the second pyrocondensation ring comprises a plurality of disconnected second arc parts, exists the clearance between the adjacent second arc part, and at the in-process that the transparent sleeve pipe of pyrocondensation formula contracts, these second arc parts can move and the laminating on the surface of electric wire tightly along with the transparent sleeve pipe of pyrocondensation formula, and is inseparabler with the laminating of electric wire, can further reduce the gap width between the transparent sleeve pipe of pyrocondensation formula and the electric wire.

In a preferred example of the present application: in the direction of approaching each other, the inner diameters of the first blind hole and the second blind hole both tend to decrease.

Through adopting above-mentioned technical scheme, the electric wire is at the in-process of inserting first blind hole or second blind hole, and the electric wire can produce slight deformation, and the joint strength between its and the spliced pole can further improve.

To sum up, the beneficial technical effect of this application does:

1. during the use after inserting first blind hole and second blind hole respectively with two electric wires, heat shrink formula transparent bushing, the shrink formula transparent bushing begins to shrink and laminates on the surface of spliced pole and electric wire, and the internal diameter of first blind hole and second blind hole of this in-process shrinks simultaneously, tightly wraps up the electric wire, and first pyrocondensation ring sum second pyrocondensation ring also can wholly or partly laminate on the surface of electric wire under the promotion of shrink formula transparent bushing simultaneously. In the use process, after water vapor permeates through a gap between the heat-shrinkable transparent sleeve and the electric wire, the water vapor is contacted with the wet color-changing pigment on the adjacent first heat-shrinkable ring or the second heat-shrinkable ring, and the wet color-changing pigment changes color. The color change can be observed through the heat-shrinkable transparent sleeve, and a reference basis is provided for maintenance or replacement.

2. One end distance is reserved between one end, close to the first blind hole, of the first long groove and the bottom of the first blind hole, and in the process that the side wall of the first blind hole deforms, the stress concentration phenomenon at the position can be reduced, and cracks can be avoided.

3. The first heat-shrinkable ring and the second heat-shrinkable ring are respectively composed of a plurality of unconnected first arc-shaped parts and a plurality of unconnected second arc-shaped parts, gaps exist between the adjacent first arc-shaped parts and the adjacent second arc-shaped parts, and in the shrinking process of the heat-shrinkable transparent sleeve, the first arc-shaped parts and the second arc-shaped parts can move along with the heat-shrinkable transparent sleeve and tightly adhere to the surface of the electric wire, so that the heat-shrinkable transparent sleeve is more tightly adhered to the electric wire, and the width of a gap between the heat-shrinkable transparent sleeve and the electric wire is further reduced.

4. During the process that the electric wire is inserted into the first blind hole or the second blind hole, the electric wire can slightly deform, and the connection strength between the electric wire and the connecting column can be further improved.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present application.

Fig. 2 is a schematic diagram of the internal structure given based on fig. 1.

Fig. 3 is a three-dimensional exploded view given based on fig. 1.

In the figure, 11, a connecting column, 12, a first blind hole, 13, a second blind hole, 14, a first long groove, 15, a second long groove, 2, a heat-shrinkable transparent sleeve, 21, a first part, 22, a second part, 23, a third part, 31, a first heat-shrinkable ring, 32, a second heat-shrinkable ring, 311, a first arc-shaped part, 321 and a second arc-shaped part.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1 and fig. 2, a heat-shrinkable terminal disclosed in the embodiment of the present application is mainly composed of a connection post 11, a heat-shrinkable transparent sleeve 2, a first heat-shrinkable ring 31, a second heat-shrinkable ring 32, and the like.

The connecting column 11 is cylindrical and is provided with two circular end faces and a side face, a first blind hole 12 and a second blind hole 13 are respectively formed in the two circular end faces, and the sum of the depth of the first blind hole 12 and the depth of the second blind hole 13 is smaller than the length of the connecting column 11.

At least two first elongated slots 14 are formed in the side wall of the connecting column 11, the bottom surfaces of the first elongated slots 14 are communicated with the inner wall of the first blind hole 12, one end of the two ends of each first elongated slot 14 is communicated with the end face where the first blind hole 12 is located, and the other end of each first elongated slot is a closed end. These first elongated slots 14 divide the portion of the connecting column 11 located at the first blind hole 12 into several mutually independent portions.

At least two second elongated slots 15 are further formed in the side wall of the connecting column 11, and the second elongated slots 15 and the first elongated slots 14 are located at two ends of the connecting column 11 respectively. The bottom surface of the second long groove 15 is communicated with the inner wall of the second blind hole 13, one end of the two ends of the second long groove is communicated with the end surface where the second blind hole 13 is located, and the other end of the second long groove is a closed end. These second elongated slots 15 divide the portion of the connecting column 11 located at the second blind hole 13 into several mutually independent portions.

The heat-shrinkable transparent sleeve 2 is composed of a total of three parts, which are sequentially joined together, of the second part 22, the first part 21 and the third part 23. The first part 21 is sleeved on the connecting column 11, and the second part 22 and the third part 23 are respectively positioned at two sides of the connecting column 11.

The first heat-shrinkable ring 31 and the second heat-shrinkable ring 32 are respectively located on the inner walls of the second part 22 and the third part 23, the surfaces of the two parts are coated with the color changing pigment, and when water vapor permeates into the gap between the heat-shrinkable transparent sleeve 2 and the electric wire and contacts the first heat-shrinkable ring 31 or the second heat-shrinkable ring 32, the color of the color changing pigment coated on the first heat-shrinkable ring 31 or the second heat-shrinkable ring 32 can be changed.

During installation, two wires to be connected together extend into the second part 22 and the third part 23 of the heat-shrinkable transparent sleeve 2 respectively, and then are pushed continuously, so that the two wires are inserted into the first blind hole 12 and the second blind hole 13 on the connecting column 11 respectively.

The heat shrinkable transparent sleeve 2 is then heated by a heat gun or other heating means, and the heat shrinkable transparent sleeve 2 begins to shrink after being heated, so that the second portion 22 and the third portion 23 thereof are tightly attached to the internal wires.

The first part 21 of the heat-shrinkable transparent sleeve 2 applies a thrust to the outer wall of the connecting column 11 in the shrinking process, and at the moment, the inner wall of the first blind hole 12 and the inner wall of the second blind hole 13 both move towards the direction close to the electric wire, and the moving amplitude of the first part is positively correlated with the distance between the inner wall and the bottom surface of the blind hole. When the inner walls of the first and second

blind holes

12 and 13 move toward the electric wire, the pressure of the contact portion with the electric wire increases, and the strength of the connection between the electric wire and the connection post 11 also increases.

In the using process, water vapor in the air can permeate inwards along the gap between the heat-shrinkable transparent sleeve 2 and the electric wire, particularly, the heat-shrinkable transparent sleeve 2 is aged gradually, and the permeation amount of the water vapor is increased more and more. Steam can lead to the wet water color-changing pigment of coating on it to discolour after the in-process of infiltration contacts with first pyrocondensation ring 31 or second pyrocondensation ring 32, should discolour and can see through in the heat shrink formula transparent bushing 2 patrolling and examining or the in-process of routine maintenance, and the staff just can maintain or change according to the condition of discolouing of first pyrocondensation ring 31 or second pyrocondensation ring 32 like this, has stopped fundamentally to repair again after damaging.

Referring to fig. 2 and fig. 3, as an embodiment of the heat shrinkable terminal provided by the present application, the length of the first long groove 14 is 0.7-0.9 times the depth of the first blind hole 12, that is, the length of the first long groove 14 is smaller than the depth of the first blind hole 12.

During the shrinkage process of the heat shrinkable transparent sleeve 2, the inner wall of the first blind hole 12 moves to the direction close to the electric wire to clamp the electric wire, and the head of the electric wire can be completely wrapped at the moment, so that the connection strength of the connection mode is higher compared with a simple plug-in connection mode.

Further, in the direction close to the bottom surface of the first blind hole 12, the width of the first long groove 14 tends to decrease, so that when the inner wall of the first blind hole 12 moves towards the direction close to the electric wire, the width between the parts far away from the bottom of the first blind hole 12 can be kept consistent with the width between the parts close to the bottom of the first blind hole or even smaller than the width between the parts close to the bottom of the first blind hole, and the connection strength between the electric wire and the connecting column 11 can be further improved.

Referring to fig. 2 and fig. 3, as an embodiment of the heat shrinkable terminal provided by the present application, the length of the second long groove 15 is 0.7-0.9 times the depth of the second blind hole 13, that is, the length of the second long groove 15 is smaller than the depth of the second blind hole 13.

In the process of shrinking the heat shrinkable transparent sleeve 2, the inner wall of the second blind hole 13 moves to the direction close to the electric wire to clamp the electric wire, and the head of the electric wire can be completely wrapped at the moment, so that the connection strength of the connection mode is higher compared with a simple plug-in connection mode.

Further, in the direction close to the bottom surface of the second blind hole 13, the width of the second long groove 15 tends to decrease, so that when the inner wall of the second blind hole 13 moves towards the direction close to the electric wire, the width between the parts far away from the bottom of the second blind hole 13 can be kept consistent with the width between the parts close to the bottom of the first blind hole or even smaller than the width between the parts close to the bottom of the first blind hole, and the connection strength between the electric wire and the connecting column 11 can be further improved.

Referring to fig. 2 and 3, as a specific embodiment of the heat-shrinkable terminal provided by the present application, the number of the first heat-shrinkable rings 31 is more than two, the first heat-shrinkable rings 31 are disposed on the inner wall of the second portion 22 at intervals, and the intervals between adjacent first heat-shrinkable rings 31 may be equal or different.

After the number of the first heat-shrinkable rings 31 is increased, water vapor can be contacted with the first heat-shrinkable rings 31 from outside to inside in the process of permeation, and after the outermost first heat-shrinkable ring 31 is contacted, the color of the first heat-shrinkable ring is changed, which indicates that the water vapor has begun to permeate, and the more the number of the first heat-shrinkable rings 31 is discolored, the more the permeation degree of the water vapor is serious.

In the process of daily inspection or maintenance, the first heat-shrinkable ring 31 can be maintained or replaced according to the color change quantity and the color change degree.

Referring to fig. 2 and 3, as an embodiment of the heat-shrinkable terminal provided by the application, the number of the second heat-shrinkable rings 32 is more than two, the second heat-shrinkable rings 32 are arranged on the inner wall of the third portion 23 at intervals, and the intervals between the adjacent second heat-shrinkable rings 32 may be equal or different.

After the number of the second heat-shrinkable rings 32 is increased, the water vapor can be contacted with the second heat-shrinkable rings 32 from outside to inside in the process of permeation, and after the outermost second heat-shrinkable ring 32 is contacted, the color of the water vapor is changed, which indicates that the water vapor has begun to permeate, and the more the number of the second heat-shrinkable rings 32 is discolored, the more the permeation degree of the water vapor is serious.

In the process of daily inspection or maintenance, the second heat-shrinkable ring 32 can be maintained or replaced according to the amount and degree of color change of the second heat-shrinkable ring.

Referring to fig. 2 and 3, as an embodiment of the heat shrinkable terminal provided by the application, the first heat shrinkable ring 31 includes more than two first arc-shaped portions 311, the first arc-shaped portions 311 can be closed into a ring shape, and the maximum outer diameter of the ring shape is smaller than the inner diameter of the second portion 22.

The more than two first arc-shaped parts 311 in the same first heat-shrinkable ring 31 are circumferentially and uniformly distributed on the inner wall of the second part 22, when the first part 22 shrinks after being heated, the more than two first arc-shaped parts 311 in the same first heat-shrinkable ring 31 can move towards the direction close to the electric wire and tightly cling to the outer wall of the electric wire, at the moment, the adjacent first arc-shaped parts 311 in the same first heat-shrinkable ring 31 can contact or leave a gap between the two parts, the gap width between the heat-shrinkable transparent sleeve and the electric wire can be reduced, and the sealing property is improved.

Referring to fig. 2 and 3, as an embodiment of the heat shrinkable terminal provided by the application, the second heat shrinkable ring 32 includes more than two second arc-shaped portions 321, the second arc-shaped portions 321 can be closed into a ring shape, and the maximum outer diameter of the ring shape is smaller than the inner diameter of the second portion 22.

The more than two second arc-shaped parts 321 in the same second heat-shrinkable ring 32 are circumferentially and uniformly distributed on the inner wall of the second part 22, when the first part 22 shrinks after being heated, the more than two second arc-shaped parts 321 in the same second heat-shrinkable ring 32 move towards the direction close to the electric wire and tightly attach to the outer wall of the electric wire, at the moment, the adjacent second arc-shaped parts 321 in the same second heat-shrinkable ring 32 can contact or leave a gap between the two parts, the width of the gap between the heat-shrinkable transparent sleeve and the electric wire can be reduced, and the sealing performance is improved.

Referring to fig. 2, as an embodiment of the heat shrinkable terminal provided by the application, the inner diameters of the first blind hole 12 and the second blind hole 13 on the connection post 11 both tend to decrease in the direction of approaching each other, so that the pressure between the inner wall of the first blind hole 12 or the inner wall of the second blind hole 13 increases with the increase of the insertion depth of the electric wire, and the connection strength can be further improved.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of the present application is not limited by the embodiments of the present application, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A heat-shrinkable terminal, comprising:

a connecting column (11);

the first blind hole (12) and the second blind hole (13) are respectively arranged on two end faces of the connecting column (11);

the at least two first elongated slots (14) are arranged on the side wall of the connecting column (11), the bottom surface of each first elongated slot is communicated with the inner wall of the corresponding first blind hole (12), one end of each first elongated slot is a closed end, and the other end of each first elongated slot is communicated with the end face where the corresponding first blind hole (12) is located;

at least two second elongated slots (15) are arranged on the side wall of the connecting column (11), the bottom surface of each second elongated slot is communicated with the inner wall of the corresponding second blind hole (13), one end of each second elongated slot is a closed end, and the other end of each second elongated slot is communicated with the end face where the corresponding second blind hole (13) is located;

the heat-shrinkable transparent sleeve (2) comprises a first part (21) sleeved on the connecting column (11) and a second part (22) and a third part (23) which respectively extend outwards from two ends of the first part (21);

a first heat-shrink ring (31) provided on the inner wall of the second portion (22); and

a second heat-shrinkable ring (32) provided on the inner wall of the third portion (23);

wherein, the surfaces of the first heat-shrinkable ring (31) and the second heat-shrinkable ring (32) are coated with wet water color-changing pigment.

2. The heat-shrinkable terminal according to claim 1, wherein: the number of the first heat-shrinkable rings (31) is more than two;

more than two first heat-shrinkable rings (31) are arranged on the inner wall of the second part (22) at intervals.

3. A heat-shrinkable terminal according to claim 1 or 2, characterized in that: the number of the second heat-shrinkable rings (32) is more than two;

more than two second heat-shrinkable rings (32) are arranged on the inner wall of the third part (23) at intervals.

4. The heat-shrinkable terminal according to claim 1, wherein: the length of the first long groove (14) is 0.7-0.9 times of the depth of the first blind hole (12).

5. The heat-shrinkable terminal according to claim 4, wherein: the width of the first elongated slot (14) tends to decrease in a direction approaching the bottom surface of the first blind hole (12).

6. A heat-shrinkable terminal according to claim 1, 4 or 5, characterized in that: the length of the second long groove (15) is 0.7-0.9 times of the depth of the second blind hole (13).

7. The heat-shrinkable terminal according to claim 6, wherein: the width of the second long groove (15) tends to decrease in a direction approaching the bottom surface of the second blind hole (13).

8. The heat-shrinkable terminal according to claim 1, wherein: the first heat shrink ring (31) comprises more than two first arc-shaped parts (311);

more than two first arc-shaped parts (311) can be enclosed into a ring shape, the maximum outer diameter of which is smaller than the inner diameter of the second part (22).

9. A heat-shrinkable terminal according to claim 1 or 8, characterized in that: the second heat shrink ring (32) comprises more than two second arcuate portions (321);

more than two second arc-shaped portions (321) can be closed together into a ring, the maximum outer diameter of which is smaller than the inner diameter of the third portion (23).

10. The heat-shrinkable terminal according to claim 1, wherein: the inner diameters of the first blind hole (12) and the second blind hole (13) tend to decrease in directions approaching each other.