KR20240041038A - Sealing method of power cable outer cover for drive motors - Google Patents

Abstract

The present invention relates to a method of sealing a power cable for a drive motor. More specifically, the present invention relates to a method of sealing a power cable for a drive motor, and more specifically, to forming a groove on the outer peripheral surface of a power cable outer shell made of polyethylene material, adhering a bond tube, and sandblasting or brushing the surface. It relates to a method of sealing a power cable for a drive motor that improves the adhesion of the liquid sealant on the surface of the power cable sheath, including a processing step.

Description

Sealing method of power cable for drive motors {SEALING METHOD OF POWER CABLE OUTER COVER FOR DRIVE MOTORS}

The present invention relates to a method of sealing a power cable for a drive motor in which the adhesion of a liquid sealant is improved by surface treating the outer shell of the power cable made of a difficult-to-adhesive material.

In general, sealant is a rubber-like material used in joints and gaps between members in civil engineering, construction, automobiles, aircraft, ships, etc., to absorb and relieve stretching, vibration, and deformation between members in addition to providing airtightness and watertightness. It means, or it means a soft, high viscosity liquid rubber composition. These sealants are mainly painted in liquid form between two adhesive parts and then undergo a curing process to function as airtight and watertight.

The outer sheath of the power cable for the drive motor is made of polyethylene (PE), and since polyethylene (PE) is a difficult-to-adhere material, the liquid sealant loses its adhesiveness to the power cable outer sheath material as temperature changes, as shown in Figure 1. As shown, there was a problem in that the liquid sealant was peeled off at the sealed area and leakage current was generated.

Republic of Korea Patent No. 10-2009276

In order to solve the above problems, the present invention is to improve the adhesion between the power cable and the liquid sealant so that the sealant does not peel off due to temperature changes in the drive motor and the power cable can be sealed at the connection area. The purpose is to provide a method of sealing a power cable for a drive motor, including a process of surface treatment of the outer shell of the power cable for the motor.

In order to achieve the above object, the sealing method of the power cable for a drive motor of the present invention includes the steps of (a) forming a groove of a certain depth around the outer peripheral surface of the power cable outer shell made of polyethylene material, and (b) the groove is It may include the step of sealing the formed power cable outer shell portion.

In the method of sealing the power cable for a drive motor of the present invention, step (a) is performed by rotating the grooved roller in contact with the outer peripheral surface of the power cable in a direction perpendicular to the longitudinal direction of the power cable to form a seal around the outer peripheral surface of the power cable shell. A groove can be formed at a certain depth.

The groove may have a concavo-convex cross-section in the longitudinal direction of the power cable.

Step (a) may form a plurality of grooves arranged at regular intervals in the power cable outer skin area.

After step (a) and before step (b), a washing step of cleaning the outer shell of the power cable in which the groove is formed may be further included.

In the method of sealing the power cable for a drive motor of the present invention, step (b) includes placing the power cable outer shell portion in which the groove is formed in the power cable in the cable receiving groove of the housing, and applying sealant to the power cable outer sheath portion where the groove is formed. It may include applying a sealant, and sealing the power cable by attaching a cover to the position where the sealant is applied.

In order to achieve the above object, the sealing method of the power cable for a drive motor of the present invention includes the steps of (a) adhering a bond tube to the outer peripheral surface of a power cable outer shell made of polyethylene material, and (b) the bond tube is adhered. It may include the step of sealing the outer portion of the power cable.

In the method of sealing a power cable for a drive motor of the present invention, step (a) is a bond tube adhesion step of applying adhesive to the inner surface of the bond tube to adhere the bond tube to the outer peripheral surface of the power cable shell, and the power It may include a heat treatment step of heat treating the bond tube attached to the outer peripheral surface of the cable shell to heat shrink.

The heat treatment step may be performed at a temperature of 300°C to 350°C.

The bond tube is a heat shrinkable tube and is preferably made of polyolefin.

Another method of sealing the power cable for a drive motor of the present invention includes the steps of (a) sandblasting the surface of the power cable outer sheath made of polyethylene material, and (b) the sandblasted portion of the power cable outer sheath. It is characterized in that it includes the step of sealing.

The sand blasting may be performed using an abrasive containing any one or more of SiC, B ₄ C, CeO ₂ , SiO ₂ and Al ₂ O ₃ .

A cleaning step of cleaning the sand-blasted power cable outer shell may be further included after step (a) of performing the sandblasting and before step (b) of applying the sealant.

Another method of sealing a power cable for a drive motor of the present invention includes the steps of (a) brushing the surface of a power cable outer shell made of polyethylene material, and (b) sealing the brushed portion of the power cable outer sheath. May include steps.

The brushing may be done by brushing the surface of the power cable outer shell with a rotating brush.

After step (a) of performing the brushing and before step (b) of applying the sealant, a cleaning step of cleaning the brushed power cable outer shell may be further included.

Through the sealing method of the power cable for a drive motor according to the present invention, the adhesiveness can be improved even on the outer shell of the power cable for a drive motor made of polyethylene, a difficult-to-adhesive material, so that liquid sealant can be used even in environments with temperature changes or high temperature and high humidity. The airtightness of the sealed portion of the power cable for the drive motor can be maintained.

In addition, the present invention has the effect of preventing electric shock accidents by preventing leakage current from occurring in the power cable for the drive motor and improving energy efficiency by preventing energy leakage.

Figure 1 shows the sealing portion separated from a conventional power cable for a drive motor.
2 to 5 are flow charts for a method of sealing a power cable for a drive motor of the present invention.
Figures 6 and 7 are schematic diagrams showing a method of forming a groove in the outer shell of a power cable according to an embodiment of the present invention.
Figure 8 is a schematic diagram showing the sealing step of a power cable for a drive motor according to an embodiment of the present invention.
Figure 9 shows the surface of the power cable outer shell according to comparative examples and examples of the present invention.
Figure 10 is a graph showing the results of leakage inspection before testing according to comparative examples and examples of the present invention.
Figure 11 shows the results of evaluating airtightness performance by thermal shock time.
Figure 12 shows the results of evaluating airtightness performance at high temperature and high humidity time.
Figure 13 shows the results of evaluating airtightness performance according to pressure increase in a thermal shock test.
Figure 14 shows the results of evaluating airtightness performance according to pressure increase in a high temperature and high humidity test.
Figure 15 shows the results of evaluating the adhesion according to the surface treatment of the power cable outer shell compared to the sensor cable according to Comparative Examples 1 to 4 of the present invention.
Figure 16 shows the results of evaluating the adhesive strength according to the surface treatment of the power cable outer shell compared to the sensor cable according to Examples 1 to 3 of the present invention.
Figures 17a to 17h show the destruction pattern observed after curing of the liquid sealant according to the thermal shock test and the high temperature and high humidity test of the present invention.
Figure 18 is a cross-sectional schematic diagram showing cohesive failure (CF) as a failure form after curing of the liquid sealant.
Figure 19 is a cross-sectional schematic diagram showing interfacial failure (AF) in the form of failure after curing of the liquid sealant.
Figure 20 shows the results of confirming the amount of bond protrusion and adhesion when applying a bond tube in one embodiment of the present invention.

The method of sealing the power cable for a drive motor of the present invention will be described in detail with reference to the drawings.

Terms such as “includes” or “consists of” used in the specification should not necessarily be construed as including all of the various components described in the specification, and some of the components may not be included, and additional components may be included. It should be interpreted as being able to include more components.

2 to 5 are flow charts for a method of sealing a power cable for a drive motor of the present invention.

Figure 2 shows a method of sealing a power cable for a drive motor through groove formation, (a) forming a groove of a certain depth around the outer peripheral surface of the power cable outer shell (S11), and washing the power cable outer sheath with high-pressure air or water. It includes a washing step (S12) and (b) a step (S13) of sealing the power cable outer skin area where the groove is formed.

In the step (a) (S11), the groove forming roller 400 is rotated on the outer peripheral surface of the power cable in a direction perpendicular to the longitudinal direction of the power cable while in contact with the power cable sheath 520 to form a circumference around the outer peripheral surface of the power cable sheath. Form a groove at a certain depth.

Figures 6 and 7 are schematic diagrams showing a method of forming a groove in the outer shell of a power cable according to an embodiment of the present invention.

As shown in FIG. 6, the surface of the groove processing roller 400 in contact with the outer shell 520 of the power cable is made of an uneven shape, so the groove 530 is the same as the shape of the surface in contact with the groove processing roller 400. Thus, a cross section in the longitudinal direction of the power cable may be formed in a concavo-convex shape.

In step (a) (S11), a plurality of grooves arranged at regular intervals are formed in the power cable outer skin area using a plurality of groove processing rollers 400.

To improve adhesion, the grooves 530 may be formed to have a depth of about 0.3 mm and a width of 1 to 2 mm. Two or more grooves 530 can be formed, and it is preferable to form about three grooves 530. Additionally, in order to maintain the insulation performance of the power cable outer sheath, it is preferable that the remaining thickness of the power cable outer sheath is 0.5 mm or more.

As shown in FIG. 7, the groove processing roller 400 rotates in contact with the outer shell 520 of the power cable, and the power cable rotates in the opposite direction to the rotation direction of the groove processing roller 400 to provide power. A groove is formed around the outer circumference of the cable sheath 520.

Figure 8 is a schematic diagram showing a sealing step (S13) of a power cable for a drive motor according to an embodiment of the present invention.

As shown in Figure 8, the step (b) (S13) is a surface treatment step (S210) of positioning the power cable outer shell portion where the groove is formed in the power cable into the cable receiving groove of the housing 100, where the groove is formed. It may include the step of applying liquid sealant 300 to the outer skin area of the power cable (S220), and the step of sealing the power cable by tightly attaching the cover 200 to the position where the liquid sealant 300 is applied (S230). You can.

Figure 3 shows a method of sealing a power cable for a drive motor using a bond tube, including (a) attaching the bond tube to the outer peripheral surface of the power cable outer shell made of polyethylene material (S21), and (b) the bond tube to which the bond tube is attached. It includes a step (S22) of sealing the power cable outer shell area.

The step (a) (S21) is a bond tube adhesion step of applying adhesive to the inner surface of the bond tube to adhere the bond tube to the outer peripheral surface of the power cable outer shell made of polyethylene material, and a bond attached to the outer peripheral surface of the power cable outer sheath. The bond tube is bonded to the surface of the power cable sheath to which the sealant is to be applied through a heat treatment step in which the tube is heat-shrinked.

In the step (a) (S21), the heat treatment step is performed at the center of the heating furnace, which is a heat treatment device, so that heat is applied to the entire bond tube. When the entire bond tube is heat treated, a certain amount of adhesive (bond) protrudes from both ends of the bond tube, thereby improving the adhesion of the bond tube.

The heat treatment step improves the adhesion between the power cable sheath and the bond tube.

The adhesive force of the bond tube is preferably 120N or more.

If the entire bond tube is not heat treated, the adhesive cannot properly protrude from both ends of the bond tube, and the adhesive strength of the bond tube is reduced.

In the heat treatment step, the bond tube may be heat treated at a temperature of 300°C to 350°C, and the heat treatment temperature is preferably 325°C.

If the heat treatment temperature of the bond tube is less than the suggested 300℃, the low heat treatment temperature reduces the amount of adhesive protruding from both ends of the bond tube, reducing the adhesive strength of the bond tube. Conversely, at heat treatment temperatures exceeding 350°C, there is a problem of reduced process efficiency compared to improved adhesion, and the adhesion of the bond tube may actually decrease.

The bond tube is preferably made of a heat shrinkable tube and is bonded to the outer peripheral surface of the power cable outer shell through heat shrinkage. This bond tube is made of a polyolefin material.

In step (b) (S22), liquid sealant is applied to the power cable outer shell area to which the bond tube is attached through step (a) (S21).

The liquid sealant used in the present invention is not particularly limited, and any adhesive material used as a sealant in the art can be used.

Figure 4 shows a method of sealing a power cable for a drive motor using sandblasting, which includes (a) a step of sandblasting the surface of the power cable outer shell (S31), and a cleaning step of washing the power cable outer sheath with high-pressure air or water (S32). , and (b) sealing the surface-treated power cable outer shell portion (S33).

In step (a) (S31), the surface roughness of the power cable outer shell made of polyethylene material is physically improved through sand blasting, thereby improving the contact force of the liquid sealant.

The sand blasting may be performed using an abrasive containing any one or more of SiC, B ₄ C, CeO ₂ , SiO ₂ and Al ₂ O ₃ .

(b) Before the step (S33), impurities including polishing residues remaining on the surface of the power cable outer shell by the sand blasting process are removed through the washing step (S32), and when washing with water, drying after washing. may additionally be included.

Step (b) (S33) is a step of sealing the power cable outer shell portion that has been sandblasted through step (a) (S31).

The (b) step (S33) is the same as in FIG. 8, where the power cable outer shell portion that has been sandblasted as a surface treatment is placed in the cable receiving groove of the housing 100 (S210), the power cable having the groove formed. The power cable is driven by applying the liquid sealant 300 to the outer skin area (S220) and sealing the power cable by tightly attaching the cover 200 to the position where the liquid sealant 300 is applied (S230). Can be sealed to the motor.

Figure 5 shows a method of sealing a power cable for a drive motor using a brush, (a) a step of brushing the surface of the power cable outer shell (S41), a cleaning step of washing the power cable outer sheath with high-pressure air or water (S42), and (b) includes a step (S43) of sealing the surface-treated power cable outer shell portion.

In step (a) (S41), the surface of the power cable outer shell made of polyethylene is brushed with a rotating brush to physically improve the roughness of the surface and improve the contact force of the liquid sealant.

In the method of sealing the power cable for a drive motor using a brush of the present invention, the washing step (S42) and the step (S43) of sealing the surface-treated power cable outer portion are the power cable for a drive motor using sand blasting described above. It can be performed in the same manner as the cleaning step (S32) and (b) the step (S33) of sealing the surface-treated power cable outer shell portion in the sealing method.

Hereinafter, the sealing method according to the surface treatment of the power cable for a drive motor of the present invention will be described in detail through comparative examples and examples. However, these comparative examples and examples are only one example of surface treatment for the invention and the scope of the present invention is not limited to these comparative examples and examples and may be modified and changed in various ways.

Table 1 below shows the cable types, shell materials, and surface treatment methods used according to comparative examples and examples.

In Table 1 below, the type of cable used was a conventional good sensor cable in Comparative Example 1, and a power cable was used in Comparative Examples 2 to 4 and Examples 1 to 4. .

As for the outer shell material, PVC stands for polyvinyl chloride and PE stands for polyethylene.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Example 4 cable type sensor cable power cable power cable power cable power cable power cable power cable power cable shell material PVC PE PE PE PE PE PE P.E. Surface treatment unprocessed unprocessed plasma primer sandblast blush Bond tube groove formation

The surface appearance according to the surface treatment of the power cable outer sheath in Comparative Examples 1 to 4 and Examples 1 to 4 of the present invention shown in Table 1 is shown in Figure 9.

Liquid sealant was applied and cured to the surface of the power cable outer shell for a drive motor surface-treated according to the above comparative examples and examples, and then the airtightness performance of the sealed area was evaluated after thermal shock and high temperature and high humidity tests. The results are shown in Figures 10 to 10. It is shown in Figure 12.

Specifically, the thermal shock test varied the temperature from -20℃ to 85℃ in one cycle, and 310 cycles were performed for 310 hours.

The high-temperature, high-humidity test evaluated airtightness performance for 753 hours at a temperature of 85°C or higher and 100% atmospheric humidity.

The airtightness test was performed at a pressure of -0.2 bar, negative pressure for 25 seconds, maintenance for 15 seconds, measurement for 5 seconds, and a volume of 0.23L, and airtightness performance was evaluated based on a leakage rate of 4ccm or less.

Figure 10 is a graph showing the results of the leakage test before the test. It was confirmed that airtightness was maintained at a leakage amount of 0.3 ccm or less in all samples before the thermal shock test and the high temperature and high humidity test.

In this specification, #1, #2, #3, #4, #5, and #6 indicate sample numbers. In Figure 6, airtightness performance was evaluated using the average value of leakage for six samples.

Figure 11 shows the results of evaluating airtightness performance by thermal shock time. As shown in Figure 11, the power cable with no surface treatment showed a leakage amount of 31.325 ccm after 155 hours of thermal shock in Comparative Example 2, and 310 In time, the leakage amount was 36.695ccm.

However, when the power cable outer shell was surface treated using the remaining Comparative Example 4 (primer treatment), Example 1 (sand blast), Example 2 (brush), Example 3 (bond tube), and Example 4 (shell groove) It was confirmed that the leakage amount was maintained below 0.4 ccm, the same as before the thermal shock test.

Figure 12 shows the results of evaluating the airtightness performance at high temperature and high humidity time. As shown in Figure 12, it was confirmed that there was no airtightness defect as the leakage amount was 0.4 ccm or less in both the comparative example and the example even after 753 hours.

Additionally, to confirm airtightness stability, airtightness performance evaluation was conducted at a pressure higher than -0.2 bar previously performed in the thermal shock test and high temperature and high humidity test.

The thermal shock test and high temperature and high humidity previously performed in FIGS. 10 to 12 were performed in the same manner, but airtightness performance was evaluated by changing the pressure to 0.2 bar, 0.5 bar, 1.0 bar, 1.5 bar, and 2.0 bar.

From the results of Figures 13 and 14, it was confirmed that the airtightness performance was satisfied with a maximum leakage of 1.36ccm even under pressurized conditions of up to 2.0bar, and these results show that the airtightness performance is more than 10 times that of the existing pressure at -0.2bar. was confirmed.

The adhesive strength and destruction pattern of the sealant after the thermal shock test and the high-temperature, high-humidity principle test are shown in Figures 15 and 16.

Figure 15 shows the results of evaluating the adhesive strength according to the surface treatment of the power cable outer shell compared to the sensor cable according to Comparative Examples 1 to 4 of the present invention, and Figure 16 shows the sensor cable according to Examples 1 to 4 of the present invention. This is the result of evaluating the adhesion according to the surface treatment of the power cable outer shell.

As in Comparative Example 1, the adhesive strength satisfies 200N or more before and after the thermal shock test and high-temperature, high-humidity principle test based on a conventional sensor cable, and the failure type of the sealant is not interfacial failure (Adhesive Failure, AF) but cohesive failure (CF). ) It is desirable to satisfy the form.

The cohesive failure (CF) appears in the form of destruction of the middle of the sealant 10 located between the cable 1 and the adhesion test jig 2, as shown in FIG. 18.

As shown in FIG. 19, the adhesive failure (AF) occurs when the sealant 10 is attached to the adhesive test jig 2 and the interface on one side of the sealant is destroyed.

As shown in Figure 15, Comparative Examples 2 to 3 all had adhesive forces of less than 200N after the high temperature and high humidity principle test, and it was confirmed that the failure mode of the sealant was not suitable as an interfacial failure (AF) type.

The adhesive strength according to the surface treatment of the power cable outer shell compared to the sensor cable according to Examples 1 to 4 of the present invention shown in Figure 16 shows that the adhesive strength of the sealant is more than 200N and the failure mode of the sealant is cohesive after the thermal shock test and the high temperature and high humidity principle test. It was confirmed that all of them appeared appropriately in the form of fracture (CF).

Figures 17a to 17h show the destruction pattern observed after curing of the liquid sealant according to the thermal shock test and the high temperature and high humidity test of the present invention.

Figure 17a shows Comparative Example 1, and it was confirmed that a common sensor cable showed cohesive failure (CF) after a thermal shock test and a high temperature and high humidity principle test.

Figure 17b is Comparative Example 2, and it was confirmed that an interfacial failure (AF) form appeared in the power cable with an untreated surface after a thermal shock test and a high temperature and high humidity principle test.

Figure 17c is Comparative Example 3, where the surface of the power cable outer shell was plasma treated, and Figure 17d is Comparative Example 4, when chemical modification was performed by applying a primer to the surface of the power cable outer sheath, showing the interface failure (AF) after the high temperature and high humidity principle test. ) was confirmed to appear.

When the surface of the power cable outer shell is treated with sand blast in Figure 17e as Example 1, blush in Figure 17f as Example 2, bond tube in Figure 17g as Example 3, and sheath groove in Example 4 in Figure 17h, In all cases, it was confirmed that a cohesive failure (CF) form appeared after the thermal shock test and high-temperature and high-humidity principle test.

Tables 2 and 3 show the physical property evaluation results for the surface treatments of the comparative examples and examples discussed above.

In Tables 2 and 3 below, durability refers to the physical property evaluation results before the thermal shock test and high-temperature, high-humidity principle test, after-endurance refers to the physical property evaluation results after the thermal shock test and high-temperature, high-humidity principle test, and proxy refers to the flow rate during airtightness performance analysis. This means that if it exceeds 4ccm, an airtightness defect that cannot be measured occurs.

division Comparative Example 1 Comparative example 2 Comparative Example 3 Comparative Example 4 Increased airtight pressure After durability No leakage Darik Darik No leakage Adhesion evaluation
(over 200N) Endurance War 218.3N 90.4N 290.5N 198.5N After durability 229.4N 175.5N 236.3N 250.5N Destruction mode analysis Endurance War Cohesive destruction Interface destruction Cohesive destruction Interface destruction After durability Cohesive destruction Interface destruction Interface destruction Interface destruction Whether surface treatment is suitable fitness incongruity incongruity incongruity

division Example 1 Example 2 Example 3 Example 4 Airtightness performance evaluation After durability No leakage No leakage No leakage No leakage Adhesion evaluation
(over 200N) Endurance War 259.3N 269.3N 268.2N 210.5N After durability 269.8N 279.7N 307.5N 231.2N Destruction mode analysis Endurance War Cohesive destruction Cohesive destruction Cohesive destruction Cohesive destruction After durability Cohesive destruction Cohesive destruction Cohesive destruction Cohesive destruction Whether surface treatment is suitable fitness fitness fitness fitness

As shown in Table 3, when the outer shell of the power cable for the drive motor is surface treated by sandblasting in Example 1, the brush in Example 2, the bond tube in Example 3, and the outer sheath groove formation in Example 4, all are airtight. In the performance evaluation, the sealant's airtightness is excellent at less than 4ccm, and the adhesive force of the sealant is over 200N even after the thermal shock test and high temperature and high humidity principle test, and all sealant failure types show cohesive failure (CF), so the drive motor using liquid sealant The airtightness of the sealed area of the power cable can be maintained.

When applying a bond tube to the surface of the power cable shell according to Example 3 of the present invention, the amount of adhesive (bond) protruding from both ends of the bond tube after the heat treatment process of the bond tube is 0.8 mm or more from the entire circumference of the tube. It is desirable to satisfy the condition that the bond tube adhesive force is 120N or more so that the bond tube can be stably adhered to the surface of the power cable sheath and ensure the airtight performance of the sealant.

The adhesive protrusion amount refers to the length of the adhesive that protrudes from one end of the bond tube in the longitudinal direction of the power cable to the outside where the bond tube does not surround the power cable.

Figure 20 shows the results of confirming the amount of adhesive protrusion and adhesion when applying a bond tube in one embodiment of the present invention.

As shown in Figure 20, when heat treatment is performed by arbitrary heating with a hot air gun as in bond tube 1 and bond tube 2, the adhesive protrusion amount appears to be less than 0.8 mm.

When heat treating bond tube 3 at a temperature of 200°C through a heating furnace under the conditions of voltage of 85V and transfer speed of 900rpm, the amount of adhesive protrusion was less than 0.8 mm, and the adhesive strength of the bond tube was confirmed on the power cable. It was confirmed that it was not suitable because it showed a low adhesive force of less than 120N at 45.3N and 51.2N.

When the bond tube 4 is heat-treated at a temperature of 325°C through a heating furnace under the conditions of a voltage of 130V and a transfer speed of 900rpm, the adhesive protrusion amount is 1.336mm and 0.956mm, and the adhesive protrusion amount is more than 0.8 around the entire circumference. Additionally, when checking the adhesive strength of the bond tube in the power cable, it was confirmed that the adhesive strength was 149.9N and 176.9N, which is higher than 120N.

These results show that in the case of surface treatment, the most appropriate bond tube process is to heat treat the bond tube to a temperature of 325°C through a heating furnace under the conditions of a voltage of 130V and a transfer speed of 900rpm to join the bond tube to the power cable sheath. You can confirm that it is.

As described above, the sealing method of the power cable for a drive motor according to the present embodiment, when the airtightness performance of the power cable made of polyethylene must be satisfied, sandblasts, brushes, bond tubes, forms grooves on the outer surface of the cable, etc. Through the same surface treatment, the adhesion of the liquid sealant can be improved to ensure airtightness.

1: cable
2: Adhesion test jig
10: Sealant
100: housing
200: Cover part
300: Liquid sealant
400: Grooving roller
510: conductor
520: outer shell
530: Home

Claims (19)

(a) forming a groove of a certain depth around the outer peripheral surface of the power cable outer shell made of polyethylene material; and
(b) sealing the power cable outer shell portion where the groove is formed; a method of sealing a power cable for a drive motor, comprising: According to paragraph 1,
In step (a),
A sealing method for a power cable for a drive motor, characterized in that a groove is formed at a certain depth around the outer circumference of the power cable shell by rotating the groove forming roller in contact with the outer circumference of the power cable in a direction perpendicular to the longitudinal direction of the power cable. . According to paragraph 2,
A sealing method for a power cable for a drive motor, wherein the groove is formed in a concavo-convex cross-section in the longitudinal direction of the power cable. According to paragraph 2,
In step (a),
A sealing method for a power cable for a drive motor, characterized in that forming a plurality of grooves arranged at regular intervals in the outer shell of the power cable. According to paragraph 1,
A method of sealing a power cable for a drive motor further comprising a cleaning step of cleaning the outer shell of the power cable in which the groove is formed after the step (a) and before the step (b). According to paragraph 1,
Step (b) above is
Positioning the power cable outer shell portion in which the groove is formed in the power cable into the cable receiving groove of the housing;
Applying sealant to the power cable outer skin area where the groove is formed;
Sealing the power cable for a drive motor, comprising: sealing the power cable by tightly fitting a cover to the position where the sealant is applied. (a) attaching a bond tube to the outer peripheral surface of a power cable shell made of polyethylene material; and
(b) sealing the outer shell portion of the power cable to which the bond tube is attached. A method of sealing a power cable for a drive motor, comprising: In clause 7,
In step (a),
A bond tube adhesion step of applying adhesive to the inner surface of the bond tube to adhere the bond tube to the outer peripheral surface of the power cable shell; and
A heat treatment step of heat treating the bond tube attached to the outer peripheral surface of the power cable shell to heat shrink; A method of sealing a power cable for a drive motor, comprising: According to clause 8,
The heat treatment step is a method of sealing a power cable for a drive motor, characterized in that heat treatment is performed at a temperature of 300 ℃ to 350 ℃. In clause 7,
A method of sealing a power cable for a drive motor, wherein the bond tube is made of polyolefin material. In clause 7,
The step (b) is
Positioning the portion of the power cable to which the bond tube is attached in the cable receiving groove of the housing;
Applying sealant to the power cable outer skin area to which the bond tube is attached;
Sealing the power cable for a drive motor, comprising: sealing the power cable by tightly fitting a cover to the position where the sealant is applied. (a) Sand blasting the surface of the power cable outer shell made of polyethylene material; and
(b) sealing the sandblasted outer shell portion of the power cable. According to clause 12,
The sandblasting is a method of sealing a power cable for a drive motor, characterized in that the sandblasting is performed using an abrasive containing any one or more of SiC, B ₄ C, CeO ₂ , SiO ₂ and Al ₂ O ₃ . According to clause 12,
A method of sealing a power cable for a drive motor further comprising a cleaning step of cleaning the sandblasted outer shell of the power cable after step (a) and before step (b). According to clause 12,
Step (b) above is
Positioning the sandblasted power cable sheath portion of the power cable in a cable receiving groove of the housing;
Applying sealant to the sandblasted power cable outer skin area;
Sealing the power cable for a drive motor, comprising: sealing the power cable by tightly fitting a cover to the position where the sealant is applied. (a) brushing the surface of the power cable outer shell made of polyethylene material; and
(b) sealing the brushed power cable outer shell portion; a method of sealing a power cable for a drive motor, comprising: According to clause 16,
The brushing is a method of sealing a power cable for a drive motor, characterized in that the surface of the power cable outer shell is brushed with a rotating brush. According to clause 16,
A method of sealing a power cable for a drive motor, further comprising a cleaning step of cleaning the brushed power cable outer shell after the step (a) and before the step (b). According to clause 16,
Step (b) above is
Positioning the brushed power cable sheath portion of the power cable in a cable receiving groove of the housing;
Applying a sealant to the brushed power cable outer skin area;
Sealing the power cable for a drive motor, comprising: sealing the power cable by tightly fitting a cover to the position where the sealant is applied.

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