Water-blocking middle-high voltage power cable

Abstract

The utility model discloses a water-blocking middle-high voltage power cable, and relates to the technical field of cables. The protective film comprises an outer protective film, an inner protective film and an inner connecting film, a calcium chloride filling cylinder is fixed in the outer protective film, an inner isolating film is fixed on the inner wall of the calcium chloride filling cylinder, an inner protective film is fixed on the inner wall of the inner isolating film, and corrugated strips are fixed on the inner wall of the inner protective film in an annular array mode. An inner sealing film is jointly fixed to the sides, away from the inner protective film, of the corrugated strips in the annular array, and an inner connecting film is fixed to the inner wall of the inner sealing film. According to the utility model, the outer protective film, the inner protective film and the inner connecting film are arranged, so that the problems that the interior of the water-blocking medium-high voltage power cable is inconvenient to recover to be dry after being affected with damp during working, and the use safety of the cable is influenced because water easily enters the cable at the fracture surface after the cable is cut off are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to cables, and in particular relates to a water-blocking medium and high voltage power cable. Background Art

[0002] The development of cable varieties must adapt to a wide range of application occasions and methods. With the deepening of research and understanding of water absorption and water dendrites of the insulation layer between cable cores, people are increasingly aware of the importance of waterproof performance to medium and high voltage power cables. When the cable is in a humid environment, moisture can easily enter the cable, causing the insulation effect inside the cable to decrease. Therefore, it is necessary to use water-blocking power cables to cooperate with medium and high voltage power transmission, but it still has the following disadvantages in actual use:

[0003] 1. When the water-blocking medium and high voltage power cables are working, the cables are dried directly through the internal water absorption components. However, after long-term use, the space inside will be filled with water vapor. After the external environment returns to dry and high temperature, it takes a long time for the internal part to return to dryness, which is inconvenient to use.

[0004] 2. When water-blocking medium and high voltage power cables are in operation, when facing cables of different lengths, the cables need to be cut. During the cable cutting process, in order to prevent water from entering the interior, the cavity needs to be used for sealing. This can easily cause water to enter the cable at the cross section of the power cable, affecting the safe use of the cable. Utility Model Content

[0005] The utility model aims to provide a water-blocking medium and high voltage power cable. By arranging an outer protective film, an inner protective film and an inner connecting film, the utility model solves the problem that the water-blocking medium and high voltage power cable is inconvenient to dry after the inside is damp during operation, and water easily enters the cross section of the cable after it is cut, thus affecting the safe use of the cable.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model discloses a water-blocking medium- and high-voltage power cable, comprising an outer protective film, an inner protective film and an inner connecting film, wherein a calcium chloride filling cylinder is fixed inside the outer protective film, an inner isolation film is fixed on the inner wall of the calcium chloride filling cylinder, an inner protective film is fixed on the inner wall of the inner isolation film, corrugated strips are fixed in an annular array on the inner wall of the inner protective film, an inner closing film is commonly fixed on the side of the corrugated strips in the annular array away from the inner protective film, an inner connecting film is fixed on the inner wall of the inner closing film, when working, the calcium chloride filling cylinder is closed therein by the outer protective film, the corrugated strip is fixed therein by the inner protective film, the inner connecting film and the corrugated strip are closed and protected by the inner closing film, and an inner filling core is fixed therein by the inner connecting film.

[0008] Furthermore, a plurality of connecting sleeves are embedded and fixed in the outer protective film, and the connecting sleeves are evenly distributed along the radial direction in the outer protective film. A one-way air valve is fixed on the inner wall of the connecting sleeve. When the outer protective film is working, the one-way air valve is fixed therein through the connecting sleeve, so that the water vapor evaporated from the calcium chloride filling cylinder can be provided to the connecting sleeve for leakage.

[0009] Furthermore, reinforcing plates are fixed in an annular array on the inner wall of the inner protective film, the reinforcing plates are fixed between two adjacent corrugated strips, and the reinforcing plates are all fixed on the circumference of the inner closed film. The inner protective film increases the connection strength between the inner protective film and the inner closed film through the reinforcing plates.

[0010] Furthermore, an inner filling core is fixed on the inner wall of the inner connecting membrane, a fixing hole three is opened in the inner filling core along the central axis, an inner reinforcing core is fixed in the fixing hole three, and when the inner connecting membrane is working, the inner reinforcing core is fixed through the fixing hole three in the inner filling core.

[0011] Furthermore, the inner filling core outside the inner reinforcement core is provided with two fixing holes in a ring array, and two conductive wires are fixed in the two fixing holes, and the inner filling core cooperates with the conductive wires to transmit electricity.

[0012] Furthermore, a fixing hole one is provided in a ring array in the inner filling core outside the conductive wire two arranged in a ring array, and the conductive wire one is fixed in the fixing hole one, and the conductive wire one is fixed in the inner filling core through the fixing hole one.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model solves the problem that it is inconvenient to restore the water-blocking medium and high voltage power cables to dry after the inside is damp during operation by arranging an outer protective film. When the outer protective film is in operation, the cable is sealed externally, and the calcium chloride in the calcium chloride filling cylinder allows moisture to enter the cable through the outer protective film and be absorbed by the dryer, thereby reducing its further penetration into the cable. When located in a high-temperature dry environment, the one-way air valve is connected through the inner connecting sleeve of the outer protective film, so that when the cable is subjected to high temperature and the moisture absorbed by the calcium chloride absorption cylinder is separated, water vapor is transmitted through the one-way air valve, so that the water-blocking medium and high voltage power cables can be easily restored to dry after the inside is damp during operation.

[0015] 2. The utility model solves the problem that water easily enters the cross section of a water-blocking medium and high voltage power cable after it is cut during operation, thus affecting the safe use of the cable, by providing an inner protective film and an inner connecting film. After the cable is cut, the corrugated strips cooperate with the reinforcing plates on the cross section, so that a large number of small compartments separated from each other are separated between the inner protective film and the inner closing film, so that when the cable is cut, the corresponding structure behind it can be well sealed, thereby better maintaining the sealing effect of the cross section position of the water-blocking cable and better ensuring the safe use of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the assembly structure of a water-blocking medium and high voltage power cable;

[0017] Figure 2 It is a three-dimensional diagram of the outer protective film structure;

[0018] Figure 3 for Figure 2 A magnified view of the structure at A;

[0019] Figure 4 It is a three-dimensional diagram of the inner protective film structure;

[0020] Figure 5 This is a three-dimensional diagram of the half-section structure of the inner protective film;

[0021] Figure 6 for Figure 5 A magnified view of the structure at B in FIG.

[0022] Figure 7 This is a diagram showing the internal connection film, conductive wire 1, conductive wire 2 and internal reinforcement core being separated from each other.

[0023] Reference numerals:

[0024] 1. Outer protective film; 101. Calcium chloride filling cylinder; 102. Inner isolation film; 103. Connecting sleeve; 104. One-way air valve; 2. Inner protective film; 201. Reinforcement plate; 202. Corrugated strip; 203. Inner sealing film; 3. Inner connecting film; 301. Inner filling core; 302. Fixing hole one; 303. Fixing hole two; 304. Fixing hole three; 305. Conductive wire one; 306. Conductive wire two; 307. Inner reinforcing core. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] See also Figure 1-7As shown, the utility model is a water-blocking medium- and high-voltage power cable, comprising an outer protective film 1, an inner protective film 2 and an inner connecting film 3. A calcium chloride filling cylinder 101 is fixed inside the outer protective film 1. When the outer protective film 1 is working, the cable is sealed from the outside. The calcium chloride in the calcium chloride filling cylinder 101 allows moisture to penetrate the outer protective film 1 and enter the cable. The moisture is dried and absorbed, thereby reducing its further penetration into the cable. An inner isolation film 102 is fixed on the inner wall of the calcium chloride filling cylinder 101. When the inner isolation film 102 is working, the calcium chloride in the calcium chloride filling cylinder 101 is separated from the inner protective film 2. The inner protective film 2 is fixed on the inner wall of the inner isolation film 102. When working, the corrugated strips 202 are protected. The inner wall of the inner protective film 2 is fixed with corrugated strips 202 in an annular array. The corrugated strips 202 cooperate with the reinforcing plate 201 to separate a large number of small compartments separated from each other between the inner protective film 2 and the inner sealing film 203, so that when the cable is cut, the corresponding structure behind it can be well sealed. The corrugated strips 202 in an annular array are fixed with the inner sealing film 203 on one side away from the inner protective film 2. When working, the inner sealing film 203 seals the corrugated strips 202 and the inner connecting film 3. The inner connecting film 3 is fixed on the inner wall of the inner sealing film 203. When working, the inner connecting film 3 fixes the inner filling core 301 therein.

[0027] Among them Figure 1-3 As shown, a plurality of connecting sleeves 103 are embedded and fixed in the outer protective film 1. The connecting sleeves 103 are evenly distributed along the radial direction in the outer protective film 1. A one-way air valve 104 is fixed on the inner wall of the connecting sleeve 103. When the outer protective film 1 is working, the one-way air valve 104 is connected through the connecting sleeve 103, so that when the cable is subjected to high temperature and the moisture absorbed by the calcium chloride absorption tube is separated, the water vapor can pass through the one-way air valve 104.

[0028] Among them Figure 1 , 4 As shown in Figures 5 and 6, reinforcing plates 201 are fixed in a circular array on the inner wall of the inner protective film 2. The reinforcing plates 201 are fixed between two adjacent corrugated strips 202. The reinforcing plates 201 are all fixed on the circumference of the inner closed film 203. When the inner protective film 2 is working, the reinforcing plates 201 increase the cable strength and separate the corrugated strips 202 from each other.

[0029] Among them Figure 1 , 7As shown, an inner filling core 301 is fixed on the inner wall of the inner connecting membrane 3, and a fixing hole three 304 is opened along the central axis in the inner filling core 301, and an inner reinforcing core 307 is fixed in the fixing hole three 304. When the inner connecting membrane 3 is working, the inner reinforcing core 307 is fixed by the fixing hole three 304 on the inner filling core 301, and the central tensile strength of the cable is increased by the inner reinforcing core 307.

[0030] Among them Figure 1 , 7 As shown, the inner filling core 301 outside the inner reinforcement core 307 is provided with fixing holes 303 in a circular array, and the conductive wires 306 are fixed in the fixing holes 303. When the inner filling core 301 is working, the conductive wires 306 are fixed through the fixing holes 303, and the setting of the conductive wires 306 assists the conductive wires 1 305 in transmitting electricity.

[0031] Among them Figure 1 , 7 As shown, the inner filling core 301 outside the conductive wire 2 306 arranged in a circular array has fixing holes 302 running through it in the form of a circular array, and the conductive wire 1 305 is fixed through the fixing holes 1 302. The inner filling core 301 fixes the conductive wire 1 305 through the fixing holes 1 302, and transmits electricity through the arrangement of the conductive wire 1 305.

[0032] The specific working principle of the utility model is as follows: during operation, after the cable is laid or erected, when moisture in the air or rainwater penetrates into the outer protective film 1, the calcium chloride in the calcium chloride filling cylinder 101 makes the moisture dry and absorbed when it penetrates through the outer protective film 1 into the cable, thereby reducing its further penetration into the cable. On sunny days, the cable is heated by sunlight, so that after the calcium chloride filling cylinder 101 is heated, the crystal water in the calcium chloride after absorbing water is decomposed to generate water vapor, which enters the connecting sleeve 103 on the outer protective film 1, and the water vapor is allowed to penetrate from the outer protective film 1 through the one-way air permeable valve 104, so that the calcium chloride in the calcium chloride filling cylinder 101 recovers to the state before absorbing the crystal water. After the cable is cut, the corrugated strips 202 cooperate with the reinforcing plate 201 on its cross section, so that a large number of small compartments separated from each other are separated between the inner protective film 2 and the inner sealing film 203, so that when the cable is cut, the corresponding structure behind it can be well sealed.

[0033] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the aforementioned embodiments and any equivalent replacement of some of the technical features therein, any modification, equivalent replacement, and improvement made are all within the protection scope of the present invention.

Claims

1. A water-blocking medium- and high-voltage power cable, comprising an outer protective film (1), an inner protective film (2) and an inner connecting film (3), characterized in that: A calcium chloride filling cylinder (101) is fixed inside the outer protective film (1), an inner isolation film (102) is fixed on the inner wall of the calcium chloride filling cylinder (101), an inner protective film (2) is fixed on the inner wall of the inner isolation film (102), corrugated strips (202) are fixed in an annular array on the inner wall of the inner protective film (2), an inner sealing film (203) is fixed on the side of the corrugated strips (202) in an annular array away from the inner protective film (2), and an inner connecting film (3) is fixed on the inner wall of the inner sealing film (203).

2. A water-blocking medium and high voltage power cable according to claim 1, characterized in that: A plurality of connection sleeves (103) are embedded and fixed in the outer protective film (1), the connection sleeves (103) are evenly spaced radially in the outer protective film (1), and a one-way air-permeable valve (104) is fixed on the inner wall of the connection sleeve (103).

3. A water-blocking medium and high voltage power cable according to claim 1, characterized in that: Reinforcement plates (201) are fixed in an annular array on the inner wall of the inner protective film (2), the reinforcement plates (201) are fixed between two adjacent corrugated strips (202), and the reinforcement plates (201) are all fixed on the circumference of the inner closed film (203).

4. A water-blocking medium and high voltage power cable according to claim 1, characterized in that: An inner filling core (301) is fixed on the inner wall of the inner connecting membrane (3), a fixing hole three (304) is provided through the inner filling core (301) along the central axis, and an inner reinforcing core (307) is fixed through the fixing hole three (304).

5. A water-blocking medium and high voltage power cable according to claim 4, characterized in that: The inner filling core (301) outside the inner reinforcement core (307) is provided with two fixing holes (303) in a ring array, and two conductive wires (306) are fixed in the two fixing holes (303).

6. A water-blocking medium and high voltage power cable according to claim 5, characterized in that: The inner filling core (301) outside the conductive wires (306) arranged in a circular array is provided with fixing holes (302) extending therethrough in a circular array, and the conductive wires (305) are fixedly passed through the fixing holes (302).

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