Combined oil cup for medium-voltage cable three-phase withstand voltage test

Abstract

The utility model relates to the technical field of cable test equipment, and discloses a medium-voltage cable three-phase withstand voltage test combination oil cup which comprises a cup body, a metal shielding layer is fixedly installed at the bottom end of the cup body, a ground wire is fixedly installed at the bottom end of the metal shielding layer, a metal buckle is fixedly installed on the upper portion of the metal shielding layer, and the metal buckle is fixedly installed on the bottom end of the metal shielding layer. The metal buckle is located at the bottom of an inner cavity of the cup body, telescopic rods are symmetrically and fixedly installed on the left portion and the right portion of an inner cavity of the metal buckle, metal ejector pins are fixedly installed at the telescopic ends of the telescopic rods, first springs are arranged outside the telescopic rods, and the ends, close to the center of the inner cavity of the metal buckle, of the first springs are fixedly installed on the metal ejector pins. Three insulated wires are led out from a voltage anode and are simultaneously connected with metal buckles at the bottoms of the three large oil cups, so that the test time and the intermediate oil cup replacement time are reduced, the test detection efficiency is improved, a wire core is quickly fixed by rotating a sleeve, the labor intensity of workers is reduced, and the reliability and the safety of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable testing equipment, in particular to an oil cup for a medium-voltage cable three-phase withstand voltage test combination. Background Art

[0002] With the continuous development of society, the proportion of cables in power lines is gradually increasing. Cables are used to transmit and distribute electrical energy. Cables are often used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. The core is the conductive part of the cable, which is used to transmit electrical energy and is the main component of the cable. Before the cable is used, the core needs to be subjected to a withstand voltage test to detect the safety of the cable.

[0003] In the prior art, a 35 kV power cable requires a withstand voltage test for 30 minutes. If the three-phase cores are tested separately, the test time and the time for replacing the oil cup in the middle will increase, and a total of more than two hours will be required, and a large amount of detection cost will be consumed. The detection efficiency of the test is relatively low, which is not conducive to continuous long-term testing. Therefore, in order to solve the above problems, the utility model proposes an oil cup for a three-phase withstand voltage test combination of a medium voltage cable. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an oil cup for a three-phase withstand voltage test combination of a medium-voltage cable. Three insulated wires are led out from the positive voltage pole and connected to the metal buckles at the bottom of three large oil cups at the same time, thereby reducing the test time and the time for replacing the oil cups in the middle, improving the test detection efficiency, and quickly fixing the wire core by rotating the sleeve, thereby reducing the labor intensity of the staff and improving the reliability and safety of the device.

[0005] The utility model provides the following technical solution: an oil cup for a three-phase withstand voltage test combination of a medium-voltage cable, comprising a cup body, wherein the number of the cup bodies is three and the cup bodies are evenly and equidistantly arranged, a metal shielding layer is fixedly installed at the bottom of the cup body, a ground wire is fixedly installed at the bottom of the metal shielding layer, a metal buckle is fixedly installed on the upper part of the metal shielding layer, the metal buckle is located at the bottom of the inner cavity of the cup body, telescopic rods are symmetrically fixedly installed on the left and right parts of the inner cavity of the metal buckle, a metal ejector pin is fixedly installed on the telescopic end of the telescopic rod, a spring 1 is arranged on the outside of the telescopic rod, one end of the spring 1 close to the center of the inner cavity of the metal buckle is fixedly installed on the metal ejector pin, and the other end of the spring 1 is fixedly installed on the inner wall of the metal buckle cavity.

[0006] Preferably, a fixing ring is fixedly installed on the top of the cup body, and fixing screws are evenly and movably sleeved on the side of the fixing ring. There are three fixing screws, and a fixing sleeve is clamped between one end of the three fixing screws located in the inner cavity of the fixing ring.

[0007] Preferably, a first thread is provided on the side surface of the upper end of the fixed sleeve, a rotating sleeve is arranged outside the upper end of the fixed sleeve, a second thread is provided on the inner wall of the rotating sleeve cavity, and the second thread is meshed with the first thread.

[0008] Preferably, a wedge ring is fixedly installed at the bottom of the rotating sleeve, and grooves are evenly opened in the inner wall of the fixed sleeve cavity. The number of the grooves is three, and a wedge block is movably sleeved on the side of the groove away from the fixed sleeve cavity.

[0009] Preferably, the wedge block and the bottom of the wedge ring fit together, and a moving rod is fixedly installed on one side of the wedge block close to the groove, and the moving rod is movably sleeved on the inner wall of the fixed sleeve cavity.

[0010] Preferably, an insulating rubber pad is fixedly installed on one end of the moving rod located in the inner cavity of the fixed sleeve, and a spring 2 is provided outside the moving rod and located in the groove, one end of the spring 2 is fixedly installed on the wedge block, and the other end of the spring 2 is fixedly installed on the inner wall of the groove.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. By replacing fixed sleeves with different inner diameters to fix wire cores of different sizes, the applicability of the test device is greatly improved. Three insulated wires are led out from the positive pole of the voltage and connected to the metal buckle at the bottom of the cup body through the inner cavity of the fixed sleeve. A metal thimble that is conductive to the metal buckle is provided inside the metal buckle. The ends of the three-core conductors are processed and contacted with the metal thimbles respectively. At this time, the metal thimbles move backward under pressure, thereby driving the telescopic rod to contract, so that the spring is compressed to generate elastic potential energy. The metal thimble uses the elastic potential energy to tighten the end of the wire core to prevent the wire core from loosening during the test. By setting three cups, the three-phase wire cores can be tested at the same time, which reduces the test time and the time for replacing the oil cup in the middle, reduces the detection cost, has good economic benefits, and improves the test detection efficiency.

[0013] 2. By rotating the rotating sleeve to move it on the fixed sleeve, the bottom of the wedge ring contacts the wedge block and pushes the wedge block into the groove. At this time, the second spring contracts to generate elastic potential energy. The wedge block moves the two insulating rubber pads in the inner cavity of the fixed sleeve close to each other through the moving rod, thereby clamping the wire core in the inner cavity of the fixed sleeve. Compared with clamping the wire core by screws, this fixing method is more convenient and quick, and reduces the labor intensity of the staff. At the same time, the insulating rubber pad can reduce the risk of leakage during the test, improve the reliability and safety of the device, and avoid excessive clamping force causing wear of the wire core, thereby ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic diagram of the exterior structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the metal buckle structure of the utility model;

[0017] Figure 4 It is a cross-sectional schematic diagram of the fixed sleeve of the utility model.

[0018] In the figure: 1. cup body; 2. metal shielding layer; 3. ground wire; 4. metal buckle; 5. telescopic rod; 6. metal thimble; 7. spring 1; 8. fixing ring; 9. fixing screw; 10. fixing sleeve; 11. thread 1; 12. rotating sleeve; 13. thread 2; 14. wedge ring; 15. groove; 16. wedge block; 17. moving rod; 18. insulating rubber pad; 19. spring 2. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-Figure 4A medium-voltage cable three-phase withstand voltage test combined oil cup, comprising a cup body 1, the number of cup bodies 1 is three and they are evenly and equidistantly arranged, a metal shielding layer 2 is fixedly installed at the bottom of the cup body 1, a ground wire 3 is fixedly installed at the bottom of the metal shielding layer 2, a metal buckle 4 is fixedly installed on the upper part of the metal shielding layer 2, the metal buckle 4 is located at the bottom of the inner cavity of the cup body 1, and telescopic rods 5 are symmetrically fixedly installed on the left and right parts of the inner cavity of the metal buckle 4, and a metal ejector pin 6 is fixedly installed on the telescopic end of the telescopic rod 5, and a spring 7 is arranged on the outside of the telescopic rod 5, one end of the spring 7 close to the center of the inner cavity of the metal buckle 4 is fixedly installed on the metal ejector pin 6, and the other end of the spring 7 is fixedly installed on the inner wall of the metal buckle 4 cavity, a fixing ring 8 is fixedly installed on the top of the cup body 1, and a fixing screw 9 is evenly and movably sleeved on the side of the fixing ring 8, and the number of the fixing screws 9 is three, and a fixing sleeve 10 is clamped between one end of the three fixing screws 9 located in the inner cavity of the fixing ring 8, and the fixing on the fixing ring 8 is fixedly mounted. The screw 9 is tightened to fix the fixed sleeve 10, and then three insulated wires are led out from the positive pole of the voltage, so that the three insulated wires pass through the inner cavity of the fixed sleeve 10 and are respectively connected to the metal buckles 4 at the bottom of the three large oil cup bodies 1. The metal buckle 4 is provided with a metal thimble 6 that is conductive with the metal buckle 4. The ends of the three-core conductors are processed and contacted with the metal thimble 6 respectively. At this time, the metal thimble 6 moves backward under pressure, thereby driving the telescopic rod 5 to contract, so that the spring 1 7 is compressed to generate elastic potential energy. The metal thimble 6 uses the elastic potential energy to tighten the end of the wire core to prevent the wire core from loosening during the test. By setting three cup bodies 1, the three-phase wire cores can be tested at the same time, which reduces the test time and the time for replacing the oil cup in the middle, reduces the detection cost, has good economic benefits, and improves the test detection efficiency. The wire core can be fixed by replacing the fixed sleeves 10 with different inner diameters, so that the applicability of the test device is greatly improved.

[0021] A thread 11 is provided on the side surface of the upper end of the fixed sleeve 10, and a rotating sleeve 12 is arranged on the outer side of the upper end of the fixed sleeve 10. A thread 2 13 is provided on the inner wall of the cavity of the rotating sleeve 12, and the thread 2 13 is meshed with the thread 11. A wedge ring 14 is fixedly installed on the bottom of the rotating sleeve 12. Grooves 15 are evenly provided in the inner wall of the cavity of the fixed sleeve 10. There are three grooves 15. A wedge block 16 is movably sleeved on the side of the groove 15 away from the inner cavity of the fixed sleeve 10. The wedge block 16 fits with the bottom of the wedge ring 14. A moving rod 17 is fixedly installed on the side of the wedge block 16 close to the groove 15. The moving rod 17 is movably sleeved on the inner wall of the cavity of the fixed sleeve 10. An insulating rubber pad 18 is fixedly installed on one end of the moving rod 17 located in the inner cavity of the fixed sleeve 10. A spring 2 19 is provided outside the moving rod 17 and located in the groove 15. One end of the spring 2 19 is fixedly installed on the wedge block 16 On the top, the other end of the spring 2 19 is fixedly installed on the inner wall of the groove 15. The rotating sleeve 12 is rotated and meshed with the thread 2 13 through the thread 1 11, so that the rotating sleeve 12 moves on the fixed sleeve 10. During the movement of the rotating sleeve 12, the bottom of the wedge ring 14 is driven to contact the wedge block 16 so that the wedge block 16 enters the groove 15. At this time, the spring 2 19 contracts to generate elastic potential energy. The wedge block 16 makes the two insulating rubber pads 18 in the inner cavity of the fixed sleeve 10 approach each other through the moving rod 17, so as to achieve the clamping and fixing of the wire core in the inner cavity of the fixed sleeve 10. Compared with fixing and clamping the wire core by screws, this fixing method is more convenient and quick, and reduces the labor intensity of the staff. At the same time, the insulating rubber pad 18 can reduce the risk of leakage during the test, improve the reliability and safety of the device, and avoid excessive clamping force causing wear of the wire core, thereby ensuring the accuracy of the test results.

[0022] Working principle: tighten the fixing screw 9 on the fixing ring 8 to fix the fixing sleeve 10, and then lead out three insulated wires from the positive pole of the voltage, so that the three insulated wires pass through the inner cavity of the fixing sleeve 10 and are respectively connected to the metal buckles 4 at the bottom of the three large oil cup bodies 1. The metal buckle 4 is provided with a metal thimble 6 that is conductive to the metal buckle 4. After the ends of the three-core conductors are processed, they are respectively in contact with the metal thimble 6. At this time, the metal thimble 6 moves backward under pressure, thereby driving the telescopic rod 5 to contract, so that the spring 7 is compressed to generate elastic potential energy. The metal thimble 6 uses the elastic potential energy to tighten the end of the wire core. At this time, the rotating sleeve 12 is rotated and meshed with the thread 1 1 and the thread 2 13 through the thread 1 1, so that the rotating sleeve 12 moves on the fixed sleeve 10. During the movement of the rotating sleeve 12, the bottom of the wedge ring 14 is driven to contact the wedge block 16 so that the wedge block 16 enters the groove 15. At this time, the spring 2 19 contracts to generate elastic potential energy. The wedge block 16 moves the two insulating rubber pads 18 in the inner cavity of the fixed sleeve 10 to approach each other through the moving rod 17, thereby clamping and fixing the wire core in the inner cavity of the fixed sleeve 10. At the same time, the three-phase insulated metal shielding layer 2 is connected to the test system ground wire 3.

Claims

1. A medium voltage cable three-phase withstand voltage test combined oil cup, comprising a cup body (1), characterized in that: The cup bodies (1) are three in number and are evenly and equidistantly arranged. A metal shielding layer (2) is fixedly mounted on the bottom of the cup body (1). A ground wire (3) is fixedly mounted on the bottom of the metal shielding layer (2). A metal buckle (4) is fixedly mounted on the top of the metal shielding layer (2). The metal buckle (4) is located at the bottom of the inner cavity of the cup body (1). Telescopic rods (5) are symmetrically fixedly mounted on the left and right parts of the inner cavity of the metal buckle (4). A metal ejector pin (6) is fixedly mounted on the telescopic end of the telescopic rod (5). A spring (7) is arranged on the outside of the telescopic rod (5). One end of the spring (7) close to the center of the inner cavity of the metal buckle (4) is fixedly mounted on the metal ejector pin (6), and the other end of the spring (7) is fixedly mounted on the inner wall of the metal buckle (4) cavity.

2. The oil cup for medium voltage cable three-phase withstand voltage test combination according to claim 1, characterized in that: A fixing ring (8) is fixedly mounted on the top of the cup body (1), and a fixing screw (9) is evenly and movably sleeved on the side of the fixing ring (8). There are three fixing screws (9), and a fixing sleeve (10) is clamped between one end of the three fixing screws (9) located in the inner cavity of the fixing ring (8).

3. The oil cup for medium voltage cable three-phase withstand voltage test combination according to claim 2, characterized in that: A first thread (11) is provided on the side surface of the upper end of the fixed sleeve (10), a rotating sleeve (12) is arranged outside the upper end of the fixed sleeve (10), a second thread (13) is provided on the inner wall of the cavity of the rotating sleeve (12), and the second thread (13) and the first thread (11) are meshed with each other.

4. The oil cup for medium voltage cable three-phase withstand voltage test combination according to claim 3, characterized in that: A wedge ring (14) is fixedly mounted on the bottom of the rotating sleeve (12), and grooves (15) are evenly arranged in the inner wall of the cavity of the fixed sleeve (10). The number of the grooves (15) is three, and a wedge block (16) is movably sleeved on the side of the groove (15) away from the inner cavity of the fixed sleeve (10).

5. The oil cup for medium voltage cable three-phase withstand voltage test combination according to claim 4, characterized in that: The wedge block (16) and the bottom of the wedge ring (14) fit together, and a moving rod (17) is fixedly installed on one side of the wedge block (16) close to the groove (15), and the moving rod (17) is movably sleeved on the inner wall of the cavity of the fixed sleeve (10).

6. The oil cup for medium voltage cable three-phase withstand voltage test combination according to claim 5, characterized in that: An insulating rubber pad (18) is fixedly mounted on one end of the moving rod (17) located in the inner cavity of the fixed sleeve (10), and a second spring (19) is arranged outside the moving rod (17) and located in the groove (15), one end of the second spring (19) is fixedly mounted on the wedge block (16), and the other end of the second spring (19) is fixedly mounted on the inner wall of the groove (15).

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