Heat shrink tube for bonding silica gel cable

Abstract

The utility model relates to a heat shrink tube for bonding a silica gel cable, which comprises a tube wall, a hot melt adhesive layer and a butyl adhesive bonding layer, the hot melt adhesive layer covers the inner side of the tube wall, the butyl adhesive bonding layer is bonded on the surface of the hot melt adhesive layer, and the butyl adhesive bonding layer is bonded on the inner side of the tube wall. The butyl adhesive bonding layer at least covers the surface of the hot melt adhesive layer at the bonding position in the pipe wall, and the bonding position corresponds to the cable structure layers on the two sides of the cut-off position of the silica gel cable shielding layer. According to the utility model, good bonding between the heat shrink tube and the silica gel cable can be realized, so that the problem that no special heat shrink tube for sealing the silica gel cable exists at present is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable connection, and in particular relates to a heat shrink tube for bonding silicone cables. Background Art

[0002] In the wiring harness industry, especially the high-voltage wiring harness for new energy vehicles, when the cable conductor in the harness is energized, the cable conductor itself will generate a certain magnetic field, which will interfere with and affect nearby electronic equipment and components. In order to eliminate the interference of the cable conductor's magnetic field, a layer of metal braided mesh is generally added in the middle of the cable to shield the cable conductor's magnetic field from releasing interference signals to the surrounding area. This layer of metal braided mesh is called a cable shielding layer, and this type of cable is called a shielded cable. Shielded cables are generally composed of conductors, insulation layers, shielding layers, sheath layers, etc. from the inside to the outside.

[0003] In the design and production of high-voltage wiring harnesses for new energy vehicles, the shielding layer is generally connected to the shielding structure inside the connector and is usually installed on the equipment box along with the connector. However, some connectors are not designed with a shielding structure, such as the on-board charging socket, so the cable shielding layer cannot enter the connector to connect with it. The current general processing technology is to cut the cable shielding layer at a certain distance from the end of the connector. At the cut-off point of the cable shielding layer, if waterproof sealing treatment is not performed, when there is a risk of wading here and the wiring harness is installed at a certain inclination angle, water may flow along the cable shielding layer to the inside of the connector, and then may enter the electrical equipment through the internal structure of the connector, which may cause circuit insulation alarms, and in more serious cases, circuit or equipment fires and other risks.

[0004] At present, the high-voltage wiring harness industry for new energy vehicles generally uses double-wall heat shrink tubing to seal and waterproof the cable shield cut-off. The double-wall heat shrink tubing melts the hot melt adhesive layer of its inner layer, and then uses the melted hot melt adhesive to fill the gap, thereby playing a sealing role. However, in some practical applications, such as when the double-wall heat shrink tubing is used to seal the cut-off of the silicone cable shield, the hot melt adhesive layer of the double-wall heat shrink tubing will not be able to adhere to the sheath layer or insulation layer of the silicone cable. At this time, the sealing effect of the double-wall heat shrink tubing on the cut-off of the silicone cable shield will generally fail. This is because the hot melt adhesive of the heat shrink tubing is usually EVA or PA-based adhesive, and the sheath layer or insulation layer of the silicone cable harness is a silicone material of silicone rubber. The hot melt adhesive based on EVA or PA has no affinity with the sheath layer or insulation layer of the silicone material, so the two are difficult to bond together. If an external force is applied to the end of the heat shrink tubing, the hot melt adhesive layer and the silicone sheath layer or insulation layer of the wire will be delaminated, which is called incompatibility between materials, resulting in failure of the seal.

[0005] In order to seal the cut of silicone cable shield, the following two methods are mainly used:

[0006] 1. If Figure 1 As shown, a customized sealing body is used to seal the cut-off point of the cable shielding layer. The sealing body is generally made of rubber. The sealing body is put over the cut-off point of the shielding layer and the sealing ribs on both sides of the sealing body are used to compress and seal the sheath layer and the insulation layer of the cable respectively, thereby achieving sealing of the cut-off point of the silicone cable shielding layer.

[0007] 2. If Figure 2 As shown, waterproof cement (also called butyl tape) is wrapped and filled at the cut part of the cable shielding layer for sealing. The waterproof cement has strong plasticity and good adhesion, and can be bonded to the sheath layer or insulation layer of silicone material. The shielding cut part is covered and wrapped with waterproof cement of a certain length and thickness, thereby achieving sealing of the shielding cut part.

[0008] The sealing method using a sealing body has the following disadvantages: ① The sealing body needs to be customized according to the different diameters of the sealed cables, and has poor universal adaptability; ② Special molds need to be developed, and the development cycle is long; ③ The price is relatively expensive; ④ In order to ensure the sealing, the sealing body is usually designed to be larger in the thickness direction. After assembly, the diameter of the cable sealed part will become larger, appearing "bulgy", which will reduce the aesthetics and softness of the wire harness.

[0009] The use of waterproof cement sealing has the following disadvantages: ① In order to ensure sealing, there are certain requirements on the coating length, shape and operation method of the waterproof cement. When the operation is improper, there is a certain sealing failure rate; ② After wrapping the waterproof cement, in order to prevent the waterproof cement from being deformed or damaged due to external force, it is necessary to wrap tape around the waterproof cement to fix it, and then heat shrink the double-wall heat shrink tube for protection. The process is relatively cumbersome. Utility Model Content

[0010] The purpose of the utility model is to provide a heat shrink tube for bonding silicone cables to solve the problem that there is currently no heat shrink tube specially used to seal silicone cables, and that other existing methods for sealing silicone cables have the problems of high price, poor versatility, long development cycle, and complicated processes.

[0011] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a heat shrink tube for bonding silicone cables, comprising a tube wall, a hot melt adhesive layer and a butyl adhesive layer, the inner side of the tube wall is covered with the hot melt adhesive layer, the butyl adhesive layer is bonded to the surface of the hot melt adhesive layer, and the butyl adhesive layer at least covers the surface of the hot melt adhesive layer at a bonding position in the tube wall, and the bonding position corresponds to the cable structure layers on both sides of the cut-off point of the silicone cable shielding layer.

[0012] Its beneficial effect is that the butyl adhesive layer is arranged on the surface of the hot melt adhesive layer, especially the surface of the hot melt adhesive layer at the bonding position, which can be bonded with the sheath layer and the insulation layer on both sides of the cut-off point of the silicone cable shielding layer to form a reliable seal for the cut-off point of the cable shielding layer.

[0013] As an implementation mode, the surface of the hot melt adhesive layer is completely covered by the butyl adhesive layer.

[0014] The beneficial effects are: there is no need to consider the coating length of the butyl adhesive layer at the pipe opening position, the coating operation of the butyl adhesive layer is more convenient, and the bonding effect with the silicone cable is more reliable.

[0015] As another embodiment, the butyl adhesive layer is formed by a plurality of butyl adhesive strips arranged at intervals along the axial direction of the heat shrink tube, and at least one butyl adhesive strip is arranged on the surface of the hot melt adhesive layer at the bonding position in the tube wall.

[0016] The beneficial effect is that the amount of butyl rubber used can be reduced while ensuring the bonding and sealing effect, thereby reducing the cost of the heat shrink tube.

[0017] Furthermore, the bonding positions are located at two pipe openings of the pipe wall.

[0018] Alternatively, the bonding position is located inside the pipe opening of the pipe wall and has a distance from the pipe opening.

[0019] Alternatively, the bonding positions are respectively located at one pipe opening and inside another pipe opening of the pipe wall, and there is a distance between the bonding position located inside the pipe opening and the pipe opening.

[0020] The beneficial effect is that the bonding positions are different according to different sizes of the heat shrink tubes, so as to meet the needs of the heat shrink tubes in different situations.

[0021] When the length of the heat shrink tube is equal to the length of the area that needs to be bonded at the cut-off point of the silicone cable shielding layer, the tube mouth position of the tube wall can be used as the bonding position, and a butyl adhesive layer can be applied on the hot melt adhesive layer; when the length of the heat shrink tube is large and greater than the length of the area that needs to be bonded at the cut-off point of the silicone cable shielding layer, if the two tube mouth positions are used as the bonding positions of the heat shrink tube, the butyl adhesive layer needs to cover a larger range in the axial direction of the tube to reduce the spacing between the butyl adhesive layers at the two bonding positions, so as to bond with the sheath layer and the insulation layer on both sides of the cut-off point of the cable shielding layer, which will increase the amount of butyl adhesive used. Therefore, the bonding position is set on the inner side of the two tube mouths or one bonding position is set at the tube mouth and the inner side of the tube mouth, and the bonding position on the inner side of the tube mouth is kept at a certain distance from the tube mouth, thereby reducing the spacing between the two bonding positions, so that the butyl adhesive layer at the bonding position can be bonded with the sheath layer and the insulation layer on both sides of the cut-off point of the shielding layer, and the amount of butyl adhesive used can also be reduced.

[0022] As another embodiment, the butyl rubber adhesive layer has two spaced-apart sections, the two spaced-apart sections are respectively located at the pipe openings at both ends of the pipe wall, and the axial length of each section is less than half of the length of the pipe wall.

[0023] The beneficial effect is that the butyl adhesive layer is distributed at two pipe openings, so as to form a seal at both ends of the cable shielding layer being cut. This arrangement can reduce the amount of butyl adhesive used while ensuring the adhesive sealing effect.

[0024] As another embodiment, the butyl rubber bonding layer has two spaced-apart sections, the two spaced-apart sections are respectively located at bonding positions inside the pipe openings at both ends of the pipe wall, and there is a distance between any section and the adjacent pipe opening.

[0025] As another embodiment, the butyl rubber bonding layer has two spaced-apart sections, one of which is located at a pipe opening of the pipe wall, and the other is located inside another pipe opening of the pipe wall, and there is a distance between the section inside the pipe opening and the pipe opening.

[0026] The beneficial effect is that when the length of the heat shrink tube is greater than the length of the area to be bonded at the cutoff point of the silicone cable shielding layer, it is necessary to reduce the distance between the two bonding positions, so the two sections are arranged at the bonding positions on the inner side of the pipe mouth and keep a certain distance from the pipe mouth, or one section is arranged at the pipe mouth and the other section is arranged at the bonding position on the inner side of the pipe mouth, which can reduce the distance between the two sections, so that the butyl adhesive layer can be bonded to the sheath layer and the insulation layer on both sides of the cutoff point of the shielding layer, and at the same time, the amount of butyl adhesive used can be reduced.

[0027] Preferably, an indicator mark is provided on the outer side of the tube wall, and the position of the indicator mark corresponds to the bonding position.

[0028] The beneficial effect is that the position of the butyl adhesive layer can be determined from the outside of the heat shrink tube, so as to facilitate bonding with the structures on both sides of the cut-off point of the cable shielding layer.

[0029] The principle of the utility model is that the butyl adhesive layer adopts the adhesive layer in the butyl tape, which is an environmentally friendly solvent-free sealing adhesive material blended from main raw materials such as butyl rubber and polyisobutylene. The adhesive layer of the butyl tape is diluted with an organic solvent such as gasoline to obtain a viscous butyl adhesive. After experimental verification, it can have good adhesion with the silicone rubber sheath layer and insulation layer of the silicone cable, and also has good adhesion with the hot melt adhesive on the wall of the heat shrink tube. Therefore, the diluted viscous butyl adhesive is applied to the heat shrink tube, and the sheath layer and insulation layer on both sides of the cut-off point of the shielding layer of the silicone cable can be bonded to form a good sealing structure.

[0030] Compared with the wire sealing method and anti-cement coating method in the prior art, the utility model has the following advantages: 1. Low cost; 2. No need to develop special molds, and the development cycle and cost are greatly reduced; 3. Since the heat shrink tube has a large shrinkage, a heat shrink tube of one specification can be adapted to cables of various wire diameters; 4. The butyl adhesive layer has been coated on the heat shrink tube during the processing of the heat shrink tube, so the use method of the heat shrink tube of the utility model is the same as that of the conventional heat shrink tube, and it is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of using a sealing body to seal a silicone cable in the prior art;

[0032] Figure 2 It is a schematic diagram of using cement-proof sealing silicone cable in the prior art;

[0033] Figure 3 This is a schematic diagram of the structure of the heat shrink tube of the utility model in Example 1;

[0034] Figure 4 This is a schematic diagram of the structure of the heat shrink tube of the utility model in Example 2;

[0035] Figure 5 This is a schematic diagram of the structure of the heat shrink tube of the utility model in Example 3;

[0036] Figure 6 This is an axial expansion diagram of the tube wall of a configuration mode of the heat shrink tube of the utility model in Example 4;

[0037] Figure 7This is an axial expansion diagram of the tube wall of another arrangement of the heat shrink tube of the utility model in Example 4;

[0038] Figure 8 This is an axial expansion diagram of the tube wall of a configuration mode of the heat shrink tube of the utility model in Example 5;

[0039] Fig. 9 This is an axial expansion diagram of the tube wall of another arrangement of the heat shrink tube of the utility model in Example 5;

[0040] Fig.10 This is a schematic diagram of where the cable shielding layer is cut;

[0041] Fig.11 It is a schematic diagram of the heat shrink tube of the utility model being sleeved at the cut-off position of the cable shielding layer;

[0042] Fig.12 It is a schematic diagram of the heat shrink tube of the utility model after the cut part of the cable shielding layer is sealed;

[0043] Markings in the figure: 1. Sheath layer, 2. Insulation layer, 3. Cable shielding layer cut-off point, 4. Sealing body, 5. Waterproof cement, 6. Pipe wall, 601, Pipe mouth, 7. Hot melt adhesive layer, 8. Butyl adhesive layer, 801, Butyl adhesive strip, 9. Heat shrink tube. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0045] The heat shrink tube for bonding silicone cables proposed by the utility model comprises a tube wall, a hot melt adhesive layer and a butyl adhesive layer, wherein the tube wall is a heat shrink layer, the material of which is the same as that of the tube wall of a conventional heat shrink tube, the hot melt adhesive layer is bonded and covered on the inner side of the tube wall, the butyl adhesive layer is arranged on the hot melt adhesive layer on the inner side of the tube wall, the butyl adhesive layer and the hot melt adhesive layer are bonded to each other, and the butyl adhesive is used to bond the sheath layer and the insulating layer at both ends of the cut-off point of the silicone cable shielding layer, thereby forming a seal on the cut-off point.

[0046] The butyl adhesive layer is formed by coating butyl adhesive. Butyl tape is used for coating. Since the adhesive layer of butyl tape is usually in a solid state with strong plasticity, it is not easy to directly coat on the hot melt adhesive layer of the heat shrink tube. Therefore, the adhesive layer of butyl tape can be diluted with organic solvents such as gasoline. After diluting it to a viscous state, the viscous butyl adhesive can be used for coating.

[0047] The utility model has different implementation modes according to the coating position and coating range of the butyl rubber adhesive layer.

[0048] Example 1: Reference Figure 3As shown, a heat shrink tube for bonding silicone cables includes a tube wall 6, a hot melt adhesive layer 7 and a butyl adhesive layer 8. The hot melt adhesive layer 7 covers the inner wall of the tube wall 6, and the butyl adhesive layer 8 is coated and covered on the hot melt adhesive layer 7 and completely covers the hot melt adhesive layer 7. In this way, the entire heat shrink tube can form a three-wall structure of the butyl adhesive layer 8, the hot melt adhesive layer 7 and the tube wall 6 from the inside to the outside.

[0049] Example 2: Reference Figure 4 As shown, a heat shrink tube for bonding silicone cables includes a tube wall 6, a hot melt adhesive layer 7 and a butyl adhesive layer 8, wherein the hot melt adhesive layer 7 covers the inner wall of the tube wall 6, and the butyl adhesive layer 8 is applied on the hot melt adhesive layer 7, and the butyl adhesive layer 8 is formed by a plurality of annular butyl adhesive strips 801 arranged at intervals along the axial direction of the heat shrink tube, so that the entire heat shrink tube can form a three-wall structure of the butyl adhesive layer 8, the hot melt adhesive layer 7 and the tube wall 6 from the inside to the outside. The butyl adhesive strips 801 located at the two sides are at the bonding position of the heat shrink tube, and the bonding position corresponds to the cable structure layer on both sides of the cut-off point of the silicone cable shielding layer. The butyl adhesive strips 801 in the middle of the two sides can ensure that the cable can still be effectively bonded when the position of the heat shrink tube changes.

[0050] Example 3: Reference Figure 5 As shown, a heat shrink tube for bonding silicone cables includes a tube wall 6, a hot melt adhesive layer 7 and a butyl adhesive layer 8, wherein the hot melt adhesive layer 7 covers the inner wall of the tube wall 6, and the butyl adhesive layer 8 is coated and covered on the hot melt adhesive layer 7, and the butyl adhesive layer 8 is arranged into two sections, which are distributed at the tube mouth positions at both ends of the tube wall 6, i.e., the bonding positions of the heat shrink tube, and the axial length of each section is less than half of the length of the tube wall 6, so that a three-wall structure of the butyl adhesive layer 8, the hot melt adhesive layer 7 and the tube wall 6 from the inside to the outside is formed at both ends of the tube wall 6, and a double-wall structure of the hot melt adhesive layer 7 and the tube wall 6 from the inside to the outside is formed between the two sections of the butyl adhesive layer 8.

[0051] Example 4: Based on Example 2, this example uses a heat shrink tube whose length is greater than the length of the area where the cable shielding layer needs to be bonded and sealed at the cut point. At this time, multiple butyl adhesive strips 801 do not need to be distributed axially along the tube wall. It is only necessary to set a number of butyl adhesive strips 801 at the bonding position.

[0052] One configuration method in this embodiment is as follows Figure 6 As shown, the area where the butyl adhesive strips 801 are distributed is the bonding position. The bonding position is inside the two tube openings 601 of the heat shrink tube and has a certain distance from the tube openings 601.

[0053] Another configuration method in this embodiment is as follows Figure 7As shown, the area where the butyl adhesive strip 801 is distributed is the bonding position, and bonding positions are respectively set on the inner side and at the tube mouth 601 of the heat shrink tube, and a certain distance is kept between the bonding position on the inner side of the tube mouth 601 and the butyl adhesive strip 801 and the tube mouth 601.

[0054] Embodiment 5: Based on Embodiment 3, the length of the heat shrink tube used in this embodiment is greater than the length of the area where the cable shielding layer needs to be bonded and sealed at the cutoff point. The two intervally distributed sections are respectively located at the bonding positions on the inner side of the tube openings at both ends of the tube wall (such as Figure 8 ), or one section is located at the tube opening 601 of the heat shrink tube, and the other section is located inside the tube opening 601 (as shown in FIG. Fig. 9 As shown), there is a distance between the section located inside the nozzle 601 and the nozzle. Figure 8 , 9 The area where the butyl rubber bonding layer 8 is distributed is the bonding position.

[0055] For Example 4 and Example 5, since the heat shrink tube is relatively long and the bonding position is located inside the tube mouth, when the heat shrink tube is put on the cable, it is difficult to confirm from the outside whether the bonding position corresponds to the sheath layer 1 and the insulation layer 2 on both sides of the cable shielding layer cut off, so an indicator mark can be set on the outside of the tube wall of the heat shrink tube, and the position of the indicator mark corresponds to the bonding position. When using the heat shrink tube, you can also mark the tube mouth mark on the cable according to the length of the heat shrink tube with a marker to indicate the tube mouth position of the heat shrink tube. In this way, when the tube mouths at both ends of the heat shrink tube are aligned with the tube mouth marks on the cable, the indicator mark on the heat shrink tube is the bonding point between the heat shrink tube and the cable, and then heat shrink according to the conventional heat shrink tube usage method, and bond and seal with the cable.

[0056] Combine the following Figure 10-12 The use process of the heat shrink tube in Examples 1-3 of the utility model is described.

[0057] After the silicone cable shield is cut off Fig.10 As shown in FIG. 3 , the two sides of the cable shielding layer cut 3 are respectively the sheath layer 1 and the insulation layer 2 with different diameters. Fig.11 As shown, the heat shrink tube 9 of the utility model is sleeved on the cut-off point 3 of the cable shielding layer, and it is ensured that the butyl adhesive layer 8 on the heat shrink tube 9 corresponds to the position of the sheath layer 1 and the insulating layer 2 on both sides of the cut-off point 3 of the cable shielding layer, so as to ensure that the butyl adhesive layer 8 can be bonded and coated on the sheath layer 1 and the insulating layer 2 in the subsequent heat shrinking process; then the heat shrink tube 9 is heat-shrunk by using the conventional heat shrink tube method, so that the heat shrink tube 9 shrinks rapidly according to the shape of the sealed part, and is tightly coated on the sheath layer 1 and the insulating layer 2 of the silicone cable to form a sealing structure, as shown in FIG. Fig.12 shown.

[0058] For the heat shrinkable tube of the utility model, after the heat shrinkable tube is heat shrunk, since the butyl adhesive layer 8 is between the hot melt adhesive layer 7 and the sheath layer 1 or the insulating layer 2 of the silicone cable, and the butyl adhesive layer 8 has good adhesion to the hot melt adhesive layer 7 and the sheath layer 1 or the insulating layer 2 of the silicone cable, the hot melt adhesive layer 7 of the heat shrinkable tube and the sheath layer 1 or the insulating layer 2 of the silicone cable are bonded together as an intermediate layer, thereby achieving the function of sealing and waterproofing.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A heat shrink tube for bonding silicone cables, characterized in that: The invention comprises a tube wall (6), a hot melt adhesive layer (7) and a butyl adhesive layer (8), wherein the inner side of the tube wall (6) is covered with the hot melt adhesive layer (7), the butyl adhesive layer (8) is bonded to the surface of the hot melt adhesive layer (7), and the butyl adhesive layer (8) at least covers the surface of the hot melt adhesive layer (7) at a bonding position in the tube wall (6), and the bonding position corresponds to the cable structure layers on both sides of the cut position of the silicone cable shielding layer.

2. The heat shrink tube for bonding silicone cables according to claim 1, characterized in that: The surface of the hot melt adhesive layer (7) is completely covered by the butyl adhesive layer (8).

3. The heat shrink tube for bonding silicone cables according to claim 1, characterized in that: The butyl adhesive layer (8) is formed by a plurality of butyl adhesive strips (801) arranged at intervals along the axial direction of the heat shrink tube, and at least one butyl adhesive strip (801) is provided on the surface of the hot melt adhesive layer (7) at the bonding position in the tube wall (6).

4. The heat shrink tube for bonding silicone cables according to claim 3, characterized in that: The bonding positions are located at the two pipe openings (601) of the pipe wall (6).

5. The heat shrink tube for bonding silicone cables according to claim 3, characterized in that: The bonding position is located inside the two pipe openings (601) of the pipe wall (6) and has a distance from the pipe openings (601).

6. The heat shrink tube for bonding silicone cables according to claim 3, characterized in that: The bonding positions are respectively located at one pipe opening (601) of the pipe wall and inside another pipe opening (601), and there is a distance between the bonding position located inside the pipe opening (601) and the pipe opening (601).

7. The heat shrink tube for bonding silicone cables according to claim 1, characterized in that: The butyl adhesive layer (8) has two spaced-apart sections, the two spaced-apart sections are respectively located at the pipe openings (601) at both ends of the pipe wall (6), and the axial length of each section is less than half the length of the pipe wall (6).

8. The heat shrink tube for bonding silicone cables according to claim 1, characterized in that: The butyl rubber bonding layer (8) has two spaced-apart sections, the two spaced-apart sections are respectively located at bonding positions inside the pipe openings (601) at both ends of the pipe wall (6), and there is a distance between any section and the adjacent pipe opening (601).

9. The heat shrink tube for bonding silicone cables according to claim 1, characterized in that: The butyl rubber adhesive layer (8) has two spaced-apart sections, one of which is located at a pipe opening (601) of the pipe wall (6), and the other is located inside another pipe opening (601) of the pipe wall (6), with a distance between the section located inside the pipe opening (601) and the pipe opening (601).

10. The heat shrink tube for bonding silicone cables according to claim 5 or 7, characterized in that: An indicator mark is arranged on the outside of the tube wall (6), and the position of the indicator mark corresponds to the bonding position.

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