JPH04136824U - insulation tube - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an insulating tube with high reliability and pressure resistance. [Structure] A first insulating layer 5 is formed by winding a first insulating tape 11. A second tape 12 is wound onto this first insulating layer 5 to form a second insulating layer 6. A third tape 13 is wound on the second insulating layer 6 to form a third insulating layer. As a result, an insulating tube with a multilayer structure is obtained.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an insulating tube for insulating electrical parts and the like.

0002

[Problems to be solved by conventional techniques and ideas]

When insulating a conductor with one insulating layer, according to the standards of each European country, one layer is required. The thickness must be 1 mm or more. As a result, electrical components or electrical circuit devices It was difficult to miniaturize.

0003 Therefore, the purpose of this invention is to provide insulation tubes that can reduce the size of electrical components and electrical circuit devices. The aim is to provide a web service.

0004

[Means to solve the problem]

The present invention achieves the above object by winding the first insulating tape. Winding a second insulating tape over the formed first insulating layer and the first insulating layer. and a second insulating layer formed by It's bad.

[0005] Note that the first insulating tape has a wider width than the second insulating tape, and overlap in winding of the first insulating tape with respect to the width of the first insulating tape; The ratio of the width of the second insulating tape to the width of the second insulating tape is It is desirable that the width ratio is larger than the width ratio of the overlapped portion in winding. In addition, the ratio of the overlapping portion in the winding of the first insulating tape is set to be larger than 1/2. It is desirable to listen. Alternatively, the winding directions of the first insulating tape and the second insulating tape may be reversed. can be done. Also, the first insulating tape is wound without adhesive, and the second insulating tape is wrapped with no adhesive. It can be wound through the agent. Additionally, a third insulating tape can be provided. In addition, when winding the first, second, and third insulating tapes, the overlapping portions of these tapes may be The width ratio of the first, second, and third insulating tapes is decreased in the order of the first, second, and third insulating tapes. of the overlapping portion of the winding of the first insulating tape with respect to the width of the insulating tape of The ratio of the width of the third insulating tape to the width of the third insulating tape is set to be larger than 1/2. The ratio of the width of the overlapping part in winding the insulating tape is made smaller than 1/2, and the above-mentioned Wrap a first insulating tape and the third insulating tape in a first direction; It is desirable to wind the insulating tape in a second direction opposite to the first direction. Moreover, the winding of the first insulating tape with respect to the width of the first insulating tape is It is desirable that the ratio of the width of the overlapping portion between the two is greater than 1/2.

[0006]

[Effect]

By making the insulating tube a multilayer structure consisting of tape wrappers, the Thin layers make it possible to obtain the desired dielectric strength (creepage distance). Also, the width By increasing the overlapping portion of the first insulating tape, the outside of the insulating tape can be The creepage distance from the to the internal conductor increases, and the dielectric strength voltage of the insulated conductor increases. Ru. When the first insulating tape is the bottom layer, the first tape ensures high dielectric strength. It has the function of maintaining The second insulating tape further improves the dielectric strength and It has the protective function of 1 insulating tape. Furthermore, when providing a third insulating layer, This primarily serves to protect the first and second insulating tapes from the outside.

[0007]

【Example】

Next, an insulating tube according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 10. Ru. FIG. 1 shows an electrical component 3 consisting of a main body 1 and a pair of leads 2 covered with an insulating tube 4. Shows the reversed state. The insulation tube 4 is formed by winding insulation tape. It consists of first, second and third insulating layers 5, 6 and 7. The insulation tube 4 is shown in Figure 2. As shown, a first insulating layer 5 consisting of a wound body of a first insulating tape 11; A second insulating layer 6 consisting of a second insulating tape 12 wound on the insulating layer 5; A third insulating layer 7 consisting of a third insulating tape 13 wound on top of the second insulating layer 6. It is formed in three layers. The first insulating tape 11 is made of transparent synthetic resin (polyester) It is a tape and does not have an adhesive on the back side as shown in FIG. 3(A). Note that the dielectric strength voltage of the first insulating tape 11 in the thickness direction is about 2000V. Second The insulating tape 12 shown in FIG. 3 is a yellow synthetic resin (polyester) tape. As shown in B), the adhesive 14 is layered on the back surface. Third insulation tape Tape 13 is an orange synthetic resin (polyester) tape, as shown in (C) in Figure 3. As shown in the figure, the back surface has a layer of adhesive 15.

[0008] 4 to 9 show the windings of the first to third insulating tapes 11, 12, and 13 with the lower layer omitted. Show the direction. The first insulating tape 11 is placed in the upper right direction (first direction) as shown in FIG. It is wound so that the winding angle is 15 degrees. Overlapping portion of first insulating tape 11 The ratio W1 /T1 of the width W1 of the first insulating tape 11 to the width T1 of the first insulating tape 11 is approximately 0.70. Ru. The ratio of the width W1 of the overlapping portion to the width T1 of the first insulating tape 11 is 1/2. Since it is larger than , and also larger than 2/3, there is sufficient overlap, and the first Creepage distance from the outer peripheral surface of the coating layer to the hollow part (overlapping insulation (distance along the tape interface) is the same as the width W1 of the overlapped portion. first insulation tape The cross section of the finished part of the coil 11 is as shown in FIG. The location is triple-wound with the first insulating tape 11. Note that the first insulation The tape 11 is wound around a cylindrical core material (not shown), and when the insulating tube 4 is completed. Remove the core material. Since the first insulating tape 11 does not have an adhesive layer, it is difficult to remove the core material. can be easily achieved.

[0009] As shown in FIG. 6, the second insulating tape 12 has a winding angle of 1 in the upper left direction (second direction). It is wound in a 5 degree angle. In addition, the overlapping portion of the second insulating tape 12 The ratio W2 /T2 between the width W2 and the width T2 of the second insulating tape 12 is 0.57. subordinate Therefore, the value of W2 /T2 of the second insulating tape 12 is equal to the value of W1 /T2 of the first insulating tape 11. smaller than the value of T1. The cross section of the part where the second insulating tape 12 has been wound is As shown in FIG. 7, the same location is wrapped twice with the second insulating tape 12. has been done.

0010 As shown in FIG. 8, the third insulating tape 13 has a winding angle of 1 in the upper right direction (first direction). It is wound in a 5 degree angle. In addition, the overlapping portion of the third insulating tape 13 The ratio W3/T3 between the width W3 and the width T3 of the third insulating tape 13 is approximately 0.26, and 1 /2 and also smaller than W2 /T2 of the second insulating tape 12. third The cross section of the part where the insulating tape 13 has been wound is as shown in FIG. The location is covered at least once with a third insulating tape 13.

[0011] In FIGS. 7 and 9, the adhesives 14 and 15 shown in FIGS. 3B and 3C are omitted. However, the first and second insulating tapes 12, 13 are free from self- or other insulating tapes. They are bonded together with adhesives 14 and 15. Note that the first insulating tape 11 is It is wound around itself or the conductor 10 without using an adhesive. Figure 10 shows adhesive 1 The workings of 4 and 15 are shown in principle. In addition, in FIG. 10, the first, second and third The first to third insulating layers 5, 6, 7 formed by the edge tapes 11, 12, 13 are single layers and schematically is shown. As is clear from FIG. 10, the first to third insulating layers 5, 6, 7 are mutually bonded and integrated with adhesives 14 and 15, but the first No adhesive is present on the inner surface of the insulating layer 5. Note that the first, second and third insulation By heating the tapes 11, 12, and 13 after winding them, the adhesive 14, 15, a strong adhesion is achieved.

0012 This insulating tube 4 has the following advantages. (b) Instead of forming a tube with a single layer, it is made of multiple layers made of windings of insulating tape. Edge tube formation provides a reliable insulation layer even when the overall thickness is reduced. can be provided. In other words, in the case of a single layer, pinholes etc. may occur for some reason. In this case, the creepage distance is determined by the thickness, which is disadvantageous in terms of pressure resistance and reliability. Against this If there are multiple layers, even if there is a pinhole in one of the layers, this will not occur in the other layers. , increasing pressure resistance and reliability. (b) The width of the first insulating tape 11 is the same as that of the second and third insulating tapes 12 and 13. tape width, and the width W1 of the overlapped portion is 1/2 or more of the tape width T1. Therefore, if two or more insulating layers are substantially formed by the first insulating tape 11, In both cases, the creepage distance from the outside of the insulation coating to the hollow portion can be increased. child This ensures that the insulation required by the first insulation layer 5 due to the first insulation tape 11 is Withstand voltage (3750V or higher) has almost been achieved. Insulation by the second insulating tape 12 The main function of the edge layer 6 is to provide a margin for dielectric strength, and the first insulating tape 11 is It also functions as a protective layer that prevents deterioration of the action from the elements. third The insulating layer 7 made of the insulating tape 13 is not expected to insulate itself; Protection to prevent the first and second insulating tapes from being degraded by external influences It is coated as a layer. Therefore, the insulation performance of the insulation tube 4 is It has sufficient dielectric strength to withstand long-term use or severe environmental conditions. There is little deterioration in insulation performance even after use, and the reliability of insulation performance is high. (c) Widths T1, T2 of the first, second and third insulating tapes 11, 12, 13, Since T3 and the widths of the overlapping portions W1, W2, and W3 decrease in this order, it is possible to It is possible to ensure the edge pressure resistance and prevent the diameter of the insulating tube 4 from increasing to the maximum extent possible. Also, the winding angle And each insulating tape 11, 12, 13 is wound while keeping the feed amount of the conductor constant. This makes production easier. (d) The winding direction of the first and third insulating tapes 11 and 13 and the direction of the second insulating tape Since the winding direction of the tape 12 is opposite, the insulating tape will not loosen or unravel. come. (E) The first, second, and third insulating tapes 11, 12, and 13 have different colors. This allows you to visually check the lamination state.

[0013]

[Modified example]

The present invention is not limited to the above-mentioned embodiments, but can be modified as follows, for example. It is. (1) A configuration in which the third insulating layer 7 formed by the third insulating tape 13 is omitted I can do it. (2) For the first and second insulating tapes 11 and 12, the insulating material was selected with emphasis on insulation properties. The third insulating tape 13 is connected to the first and second insulating tapes by an external action. The first and second insulation A different insulating material than the tapes 11, 12 may be selected. Third insulating tape 13 is resistant to mechanical damage, has high chemical resistance, high heat resistance, and does not allow moisture to pass through. Insulating materials with high blocking ability are desirable. When heat resistance is important, use polyimide. It is preferable to use a resin film as the insulating material of the third insulating tape 13. (3) Adhesive on the front side of the first insulating tape 11 (the side not adjacent to the hollow part) A layer may be formed.

[0014]

[Effect of the idea]

As is clear from the above, according to the invention of each claim, the increase in thickness is suppressed and reliability is improved. It is also possible to provide an insulating tube with high pressure resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the principle of an electrical component and an insulating tube.

FIG. 2 is a front view schematically showing a part of the insulating tube.

FIG. 3 is a cross-sectional view showing first, second, and third insulating tapes.

FIG. 4 is a front view showing winding of the first insulating tape.

FIG. 5 is a sectional view taken along line AA in FIG. 4;

FIG. 6 is a front view showing the winding of the second insulating tape.

FIG. 7 is a sectional view taken along line BB in FIG. 6;

FIG. 8 is a front view showing winding of the third insulating tape.

FIG. 9 is a sectional view taken along line CC in FIG. 8;

FIG. 10 is a schematic cross-sectional view of an insulating tube.

[Explanation of symbols]

4 Insulating tube 5 First insulation layer 6 Second insulation layer 7 Third insulation layer 11 First insulation tape 12 Second insulation tape 13 Third insulation tape

Claims (7)

[Scope of utility model registration request] 1. A first insulating layer formed by winding a first insulating tape, and a second insulating layer formed on the first insulating layer.
and a second insulating layer formed by winding an insulating tape. 2. The first insulating tape has a wider width than the second insulating tape, and the width of the overlapping portion in the winding of the first insulating tape is greater than the width of the first insulating tape. The insulating tube according to claim 1, wherein the ratio is larger than the ratio of the width of the overlapping portion in the winding of the second insulating tape to the width of the second insulating tape. 3. The first insulating tape is wound with a first directionality, and the second insulating tape is wound with a second directionality opposite to the first directionality. The insulating tube according to claim 1 or 2, characterized in that the insulating tube is curved. 4. The insulating tape further comprises a third insulating tape wound over the second insulating tape, the width of the second insulating tape being larger than the width of the third insulating tape, Said second
Claim 2 or 3, wherein the ratio of the width of the overlapping part of the insulating tape is larger than the ratio of the width of the overlapping part in winding of the third insulating tape to the width of the third insulating tape.
Insulating tube as described. 5. The insulating tape further includes a third insulating tape wound over the second insulating tape, the width of the first insulating tape being larger than the width of the third insulating tape, Said first
Claim 2 or 3, wherein the ratio of the width of the overlapping part of the insulating tape is larger than the ratio of the width of the overlapping part in the winding of the third insulating tape to the width of the third insulating tape.
Insulating tube as described. 6. The first insulating tape is wound in a first direction, and the second insulating tape is wound in a direction opposite to the first direction with respect to the first insulating tape. the third insulating tape is wound in a second direction;
The insulating tube according to claim 4 or 5, wherein the insulating tube is wound in the first direction with respect to the insulating tape. 7. The first insulating tape is wound without using an adhesive, and the second insulating tape is wound on top of the first insulating tape with an overlapping portion. The insulating tube according to claim 1, wherein the insulating tube is rotated.