A DC medium voltage cable branch joint connection structure

Abstract

The present invention relates to the technical field of cable joints, and discloses a DC medium-voltage cable branch joint connection structure, comprising two protective shells, two sections of cables and quick-connect terminals, two battery cells respectively arranged inside the two sections of cables, and a connection unit arranged in the protective shell, wherein the connection unit comprises a connecting component and a fixing component arranged in the protective shell; the connecting component comprises an arc groove opened on the side walls of the two protective shells, and a turning rod arranged at each inflection point of a plurality of arc grooves; by arranging the connecting component, the ports of the two sections of cables are placed in the arc groove in the shape of the arc groove before being connected to the connection terminal, and when the two sections of cables are connected to the connection terminal, the two protective shells are installed together, so that the cables are connected to each other in an arc state, thereby effectively improving the tensile strength of the cables.

Description

Technical Field

[0001] The invention relates to the technical field of cable joints, and in particular to a direct current medium voltage cable branch joint connection structure. Background Art

[0002] Cable joints are a vital component in power and communication systems, used to connect two cables to ensure the effective transmission of current or signals. They can be divided into several types, such as heat shrink joints, cold shrink joints and terminal joints. The terminal joints clamp the cables through screws or springs in the terminal, which is convenient for quick connection and removal. The design of cable joints must meet the requirements of electrical insulation, mechanical strength and protection level to ensure their installation and durability in various environments.

[0003] Existing terminal connectors usually connect two cables through terminal blocks, and then set a protective shell at the connection point to seal and fix the connection point. However, the following problems still exist: when the connection is made through the terminal connector, the tensile resistance of the connection point is poor. When the cables at both ends are stretched by external force, because the two cables are at the same level, the tension on the cables may directly act on the connection point of the two cables, causing short circuits and looseness at the cable joints, affecting the current transmission efficiency, and at the same time causing the temperature of the connection to rise. At the same time, when the protective shell is displaced by external force, the internal terminal may vibrate under the action of inertia, and the vibration process may cause the connection between the cable and the terminal to loosen, which also affects the current transmission efficiency. Summary of the invention

[0004] In view of the fact that the existing terminal joints in the prior art have poor tensile strength and vibration resistance, and are prone to loosening and short circuiting at the connection points, a DC medium-voltage cable branch joint connection structure is proposed.

[0005] The present application provides a DC medium-voltage cable branch joint connection structure, the purpose of which is to: by setting a connecting component, the ports of two sections of cables are placed in an arc groove in the shape of an arc groove before being connected to the wiring terminal. After the two sections of cables are connected to the wiring terminal, the two protective shells are installed together, so that the cables are connected to each other in an arc state, effectively improving the tensile strength of the cables. When the two sections of cables are subjected to external tension, the bent cable can effectively share and buffer the tension, avoiding the tension from directly acting on the connection between the two sections of cables. At the same time, a fixing component is set, so that the internal foam rubber can fill the area around the wiring terminal, so that the wiring terminal is clamped and fixed. When the protective shell is displaced by external force, the wiring terminal inside it will not vibrate under the action of gravity, thereby effectively improving the vibration resistance of the joint.

[0006] The technical solution of the present invention is: a DC medium voltage cable branch joint connection structure, comprising two protective shells, two sections of cables and quick-connect terminals, two battery cells respectively arranged inside the two sections of cables, and a connection unit arranged in the protective shell, wherein the connection unit comprises a connection component and a fixing component arranged in the protective shell; The connecting components include arc grooves provided on the side walls of the two protective shells, a direction-changing rod provided at each inflection point of the multiple arc grooves, a square groove provided on the side walls of the two protective shells, connecting holes provided on the four sides of the two protective shells, bolts threadedly provided in the multiple connecting holes, and nuts threadedly provided on the multiple bolts; The two battery cells are respectively the live wire and the neutral wire, the live wire and the neutral wire of the two sections of the cable are respectively connected to the corresponding two ends of the quick-connect terminals, the end face of the arc groove is semicircular, the diameter of the arc groove is equal to the diameter of the cable, one end of the two protective shells is installed with a closing component, and the interior of the protective shell located above is installed with a clamping component.

[0007] Furthermore, the closure assembly includes a plug arranged at one end of the protective shell, a locking tooth arranged inside the plug, a waterproof gasket arranged on the inner ring of the locking tooth, a tightening cap threadedly arranged on the outer wall of the plug, and a push ring arranged on the outer wall of the tightening cap, and the locking tooth is composed of multiple splints.

[0008] Furthermore, the clamping assembly includes a sliding groove opened in the protective shell located above, a clamping plate slidably arranged inside the sliding groove, a plurality of control bolts arranged on the clamping plate, and a plurality of threaded holes opened in the protective shell, and the plurality of control bolts are all installed in the corresponding threaded holes, and the end face shape of the sliding groove and the clamping plate is equal to the end face shape of the arc groove.

[0009] Furthermore, a spiral groove is integrally formed on the side walls of the plurality of control bolts, and the control bolts are installed in corresponding threaded holes through the spiral groove threads, and a pentagonal hole is formed at the upper end of each control bolt.

[0010] Furthermore, the fixing component includes foam rubber arranged on the side walls of the two square grooves, a connecting block arranged on one side of the two foam rubbers, a piston cylinder arranged inside the protective shell, a piston plate slidably arranged on the inner wall of the piston cylinder, and a connecting tube arranged between the piston cylinder and the connecting block, one end of the connecting block is fixedly connected to the interior of the corresponding foam rubber, and one end of the piston plate is provided with a driving assembly.

[0011] Furthermore, the driving assembly includes a sliding rod arranged at one end of the piston plate, a reset plate arranged on the sliding rod, a fixed plate arranged in the protective shell, and a reset spring arranged between the reset plate and the fixed plate.

[0012] Furthermore, one end of the sliding rod passes through the outer wall of the corresponding protective shell.

[0013] Furthermore, the distance that the sliding rod exceeds the outer wall of the protective shell is equal to the length of the plug, and the length of the plug is equal to the length of the piston cylinder.

[0014] Beneficial effects of the present invention: By setting the connecting components, when one end of the two sections of cable is connected to the quick-connect terminal, it is first installed tightly with the arc groove along the multiple change-of-direction rods, so that the cable is placed in the arc groove of the protective shell in an arc shape. When the connection with the quick-connect terminal is completed and the two protective shells are installed, the control bolt is rotated to make the clamping plate press the cable tightly in the arc groove, and the cable is fixed in the two protective shells. The cable is installed in the protective shell in an arc shape, which can effectively improve the tensile resistance of the cable connection point. When the cable is subjected to external tension, the multiple bending points of the cable can effectively share the external tension, preventing the cable and the quick-connect terminal from being directly subjected to external tension and causing the connection point to become loose. At the same time, by setting the clamping plate, the bent cable can be pressed tightly in the arc groove, effectively improving the friction between the two and improving the fixing effect of the cable.

[0015] By setting up a closing component, when the tightening cap is rotated to make the tightening cap rotate on the plug, it can be locked through multiple locking teeth, so that the waterproof pad is in close contact with the outer wall of the cable, thereby playing a sealing and waterproof role. While being able to further fix the cable, the overall sealing is improved to prevent the entry of external water and cause a short circuit.

[0016] By setting a fixing component, when the tightening cap is rotated on the plug, the corresponding sliding rod can be pushed to slide synchronously inward. During the sliding process, the sliding rod will drive the corresponding piston plate to slide in the piston cylinder, and then compress the air in the piston cylinder into the foam rubber, so that the two foam rubbers expand. During the expansion process, the foam rubber can automatically fill the blank area around the quick connection terminal, thereby fixing the quick connection terminal to prevent the internal quick connection terminal from vibrating continuously under the action of inertia and causing the loosening of the connection point when the protective shell is displaced by external force. By filling the quick connection terminal with foam rubber, when the protective shell is displaced by external force, the quick connection terminal is equivalent to being a whole with the protective shell, and will not move relative to the protective shell, thereby not causing the loosening of the connection point. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure from a first viewing angle of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of decomposed three-dimensional structure; Figure 3 For the present invention Figure 2 Schematic diagram of the stereoscopic structure from the second viewing angle; Figure 4 It is a schematic diagram of the structure of the clamping assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the closure assembly of the present invention; Figure 6 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 7 It is a schematic diagram of the internal structure of the protective shell of the present invention in a partial cross-section; Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in the middle; Fig. 9 It is a schematic diagram of the structure of the fixing component of the present invention.

[0018] In the figure: 1. Protective shell; 2. Cable; 3. Quick connection terminal; 4. Battery cell; 5. Arc groove; 6. Direction change rod; 7. Bolt; 8. Nut; 9. Plug; 10. Locking teeth; 11. Waterproof pad; 12. Tightening cap; 13. Sliding groove; 14. Pressing plate; 15. Control bolt; 16. Foam rubber; 17. Connecting block; 18. Piston cylinder; 19. Piston plate; 20. Connecting pipe; 21. Sliding rod; 22. Reset plate; 23. Fixed plate; 24. Reset spring; 25. Push ring. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] Example 1, reference Figure 1-Figure 4 , which is the first embodiment of the present invention, provides a DC medium-voltage cable branch joint connection structure, including two protective shells 1, two sections of cables 2 and quick-connect terminals 3, two battery cells 4 respectively installed inside the two sections of cables 2, and also includes a connection unit installed in the protective shell 1, and the connection unit includes a connecting component and a fixing component installed in the protective shell 1.

[0021] The connecting parts include an arc groove 5 opened on the side walls of the two protective shells 1, a change-of-direction rod 6 fixedly installed at each inflection point of multiple arc grooves 5, a square groove opened on the side walls of the two protective shells 1, connecting holes opened on the four sides of the two protective shells 1, bolts 7 threadedly installed in the multiple connecting holes, and nuts 8 threadedly installed on the multiple bolts 7.

[0022] The two battery cells 4 are the live wire and the neutral wire respectively. The live wire and the neutral wire of the two sections of the cable 2 are respectively connected to the corresponding two ends of the quick-connect terminal 3. The end face of the arc groove 5 is semicircular, and the diameter of the arc groove 5 is equal to the diameter of the cable 2. A closing component is installed at one end of the two protective shells 1, and a clamping component is installed inside the upper protective shell 1.

[0023] Specifically, the connecting component is used to connect the two ends of the cable 2 at both ends, and the quick-connect terminal 3 (here is the prior art, and no further explanation is given) can connect the two ends of the cable 2 by clamping. In the prior art, a protective cover is usually installed on the outside of the quick-connect terminal 3, and the protective cover can effectively seal the connection point of the cable 2 to prevent external dust and moisture from falling on the connection point and causing short circuit and heat generation of the cable 2, and the protective cover can clamp the outer wall of the cable 2 on its side wall, so that the cable 2 is prevented from loosening the connection point when it is subjected to a certain tension. However, this connection method is usually not stable. When the quick-connect terminal 3 vibrates or the cable 2 is subjected to external tension, the connection point is prone to loosening or falling off, affecting the current transmission efficiency. Because the cables 2 are usually connected in a relatively straight line in the existing connection process, when the straight line connection is made, the two cables 2 are a straight line. At this time, when the cable 2 is subjected to external tension in the straight line direction, the tension on the cable 2 will directly act on the connection point of the cable 2, making the connection point of the cable 2 prone to loosening and short circuit. Therefore, the present invention performs multiple bending processing on the cable 2 and arranges multiple direction-changing rods 6, so that when the two cables 2 are connected to the quick-connect terminal 3 in a bent state, after the cable 2 is subjected to external tension, the multiple direction-changing rods 6 can share the tension exerted on the cable 2 instead of directly acting on the connection point of the two cables 2, which can effectively improve the tensile resistance and service life of the two cables 2 when connected.

[0024] Reference Figure 3 and Figure 4 The clamping assembly includes a sliding groove 13 opened in the protective shell 1 located above, a clamping plate 14 slidably installed in the sliding groove 13, a plurality of control bolts 15 fixedly installed on the clamping plate 14, and a plurality of threaded holes opened in the protective shell 1. The plurality of control bolts 15 are all installed in the corresponding threaded holes. The end surface shapes of the sliding groove 13 and the clamping plate 14 are equal to the end surface shape of the arc groove 5.

[0025] Specifically, when the cable 2 is installed in the arc groove 5 in a bent state, and the two protective shells 1 are installed with each other, the control bolt 15 is rotated at this time, so that the control bolt 15 moves inward in the threaded hole and drives the clamping plate 14 to move downward synchronously. When the clamping plate 14 moves downward, it can press the cable 2 in the corresponding arc groove 5, thereby fixing the cable 2 more firmly in the arc groove 5, further improving the stability of the cable 2 when connected, and preventing the connection point of the two cables 2 from falling off or loosening when connected. At the same time, because the cable 2 is in a bent state, the contact area of ​​the clamping plate 14 and the cable 2 is larger, and the direct friction between the two is larger, so that when the cable 2 is subjected to external tension, the larger friction can reduce the tension on the cable 2, thereby better improving the tensile resistance of the cable 2.

[0026] During use, the installer places the two cables 2 in the arc groove 5 respectively, connects the two battery cells 4 in the two cables 2 to the two ends of the quick-connect terminal 3 respectively, aligns the two protective shells 1, and installs them together through bolts 7 and nuts 8. The installer tightens the control bolts 15 one by one with tools, so that the control bolts 15 move downward along the threaded holes. During the downward movement of the control bolts 15, the clamping plate 14 is driven to move synchronously. The downward moving clamping plate 14 can clamp the cables 2 in the arc groove 5, thereby improving the tensile resistance and stability of the cables 2 after connection.

[0027] Example 2, reference Figure 4-Figure 6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the closing assembly includes a plug 9 fixedly installed at one end of the protective shell 1, a locking tooth 10 fixedly installed inside the plug 9, a waterproof pad 11 placed on the inner circle of the locking tooth 10, a tightening cap 12 threadedly installed on the outer wall of the plug 9, and a push ring 25 fixedly installed on the outer wall of the tightening cap 12. The locking tooth 10 is composed of a plurality of splints.

[0028] Specifically, the sealing component is used to seal the connection between the cable 2 and the protective shell 1, so as to improve the overall sealing of the device and prevent external dust and moisture from entering the device through the gaps and causing short circuit and heat at the connection points. The multiple splints are elastic, and the interior of the tightening cap 12 is an inclined surface, so that when the tightening cap 12 moves horizontally in the direction of the plug 9, the internal shoe surface squeezes the splints, so that the multiple splints shrink inward along the locking teeth 10, thereby driving the waterproof pad 11 to fit tightly against the outer wall of the cable 2. The two fit tightly, thereby improving the sealing of the device and further fixing the outer wall of the cable 2.

[0029] During use, after the installer tightens the control bolts 15 one by one, the installer rotates the tightening cap 12 so that the tightening cap 12 moves inward in the horizontal direction along the plug 9. During the inward movement of the tightening cap 12, the internal inclined surface squeezes the splint, causing the splint to bend inward, while the waterproof pad 11 is tightly fitted to the outer wall of the cable 2, thereby improving the sealing of the device.

[0030] The remaining structures are the same as those of Example 1.

[0031] Example 3, reference Figure 7-Figure 9 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the fixed component includes a foam rubber 16 fixedly installed on the side walls of the two square grooves, a connecting block 17 fixedly installed on one side of the two foam rubbers 16, a piston cylinder 18 fixedly installed inside the protective shell 1, a piston plate 19 slidably installed on the inner wall of the piston cylinder 18, and a connecting pipe 20 fixedly installed between the piston cylinder 18 and the connecting block 17. One end of the connecting block 17 is fixedly connected to the inside of the corresponding foam rubber 16, and a driving component is provided at one end of the piston plate 19.

[0032] The driving assembly includes a sliding rod 21 fixedly mounted on one end of the piston plate 19, a reset plate 22 fixedly mounted on the sliding rod 21, a fixed plate 23 slidably mounted in the protective shell 1, and a reset spring 24 fixedly mounted between the reset plate 22 and the fixed plate 23. One end of the sliding rod 21 passes through the outer wall of the corresponding protective shell 1, and the distance that the sliding rod 21 exceeds the outer wall of the protective shell 1 is equal to the length of the plug 9, and the length of the plug 9 is equal to the length of the piston cylinder 18.

[0033] Specifically, the foam rubber 16 is used to fill the gap around the quick-connect terminal 3 when it expands, so that the quick-connect terminal 3 can be fixed inside the square groove, and the sliding rod 21 slides in the corresponding protective shell 1. The sliding rod 21 slides inward, so that the sliding rod 21 drives the piston plate 19 to slide on the inner wall of the piston cylinder 18. During the sliding process, the space inside the piston cylinder 18 is compressed, so that the piston plate 19 can compress the air inside the piston cylinder 18 into the foam rubber 16, so that the foam rubber 16 expands and fills the gap around the quick-connect terminal 3. The purpose of filling it is: the quick-connect terminal 3 is placed in the square groove for easy wiring. When the protective shell 1 is displaced by external force, the quick-connect terminal 3 will continue to vibrate under the action of inertia, which causes the quick-connect terminal 3 to loosen or disconnect at the connection point during rotation, thereby causing a short circuit and heating.

[0034] During use, when the installer rotates the tightening cap 12 to move horizontally on the plug 9, the push ring 25 on its outer wall will be driven to move synchronously. During the movement of the push ring 25, it contacts one end of the corresponding sliding rod 21 and generates a horizontal thrust on the sliding rod 21, so that the sliding rod 21 slides in the horizontal direction under the action of the push ring 25, thereby driving the piston plate 19 at one end to slide on the inner wall of the piston cylinder 18, and compressing the air in the piston cylinder 18 into the foam rubber 16, so that the foam rubber 16 expands and fills the space around the quick-connect terminal 3, so that the quick-connect terminal 3 can be fixed to prevent the quick-connect terminal 3 from vibrating when subjected to external force under the action of inertia, causing the connection point to loosen.

[0035] The remaining structure is the same as that of Example 2.

[0036] Based on Examples 1-3, the working principle of the present invention is as follows: the installer places the two cables 2 in the arc groove 5 respectively, connects the two battery cells 4 in the two cables 2 to the two ends of the quick-connect terminal 3 respectively, aligns the two protective shells 1, and installs them together through bolts 7 and nuts 8. The installer tightens the control bolts 15 one by one with tools, so that the control bolts 15 move downward along the threaded holes. During the downward movement of the control bolts 15, the clamping plate 14 is driven to move synchronously. The downward moving clamping plate 14 can clamp the cables 2 in the arc groove 5, thereby improving the tensile resistance and stability of the cables 2 after connection.

[0037] After the installer tightens the control bolts 15 one by one, the installer rotates the tightening cap 12 so that the tightening cap 12 moves inward in the horizontal direction along the plug 9. During the inward movement of the tightening cap 12, the internal inclined surface squeezes the clamping plate, causing the clamping plate to bend inward, while the waterproof pad 11 is tightly fitted to the outer wall of the cable 2, thereby improving the sealing of the device.

[0038] When the installer rotates the tightening cap 12 to move horizontally on the plug 9, the push ring 25 on its outer wall will be driven to move synchronously. During the movement of the push ring 25, it contacts one end of the corresponding sliding rod 21 and generates a thrust in the horizontal direction on the sliding rod 21, so that the sliding rod 21 slides in the horizontal direction under the action of the push ring 25, thereby driving the piston plate 19 at one end to slide on the inner wall of the piston cylinder 18, and compressing the air in the piston cylinder 18 into the foam rubber 16, so that the foam rubber 16 expands and fills the space around the quick-connect terminal 3, so that the quick-connect terminal 3 can be fixed to prevent the quick-connect terminal 3 from vibrating when subjected to external force under the action of inertia, resulting in loose connection points.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A DC medium voltage cable branch joint connection structure, comprising two protective shells (1), two sections of cables (2) and quick-connect terminals (3), two battery cells (4) respectively arranged inside the two sections of cables (2), characterized in that: Also included is a connection unit arranged in the protective shell (1), the connection unit comprising a connection component and a fixing component arranged in the protective shell (1); The connecting component comprises an arc groove (5) formed on the side walls of the two protective shells (1), a direction-changing rod (6) provided at each inflection point of the plurality of arc grooves (5), a square groove formed on the side walls of the two protective shells (1), connecting holes formed on four sides of the two protective shells (1), bolts (7) threadedly provided in the plurality of connecting holes, and nuts (8) threadedly provided on the plurality of bolts (7); The two battery cells (4) are respectively a live wire and a neutral wire, the live wires and the neutral wires of the two sections of the cable (2) are respectively connected to the corresponding two ends of the quick-connect terminal (3), the end surface of the arc-shaped groove (5) is semicircular, the diameter of the arc-shaped groove (5) is equal to the diameter of the cable (2), one end of the two protective shells (1) is installed with a closing component, and the interior of the protective shell (1) located at the upper side is installed with a clamping component.

2. A DC medium voltage cable branch joint connection structure according to claim 1, characterized in that: The sealing assembly comprises a plug (9) arranged at one end of the protective shell (1), a locking tooth (10) arranged inside the plug (9), a waterproof pad (11) arranged on the inner ring of the locking tooth (10), a tightening cap (12) threadedly arranged on the outer wall of the plug (9), and a push ring (25) arranged on the outer wall of the tightening cap (12), wherein the locking tooth (10) is composed of a plurality of clamping plates.

3. A DC medium voltage cable branch joint connection structure according to claim 1, characterized in that: The clamping assembly comprises a sliding groove (13) provided in a protective shell (1) located above, a clamping plate (14) slidably arranged inside the sliding groove (13), a plurality of control bolts (15) arranged on the clamping plate (14), and a plurality of threaded holes provided in the protective shell (1), wherein the plurality of control bolts (15) are all installed in corresponding threaded holes, and the end surface shapes of the sliding groove (13) and the clamping plate (14) are equal to the end surface shape of the arc groove (5).

4. A DC medium voltage cable branch joint connection structure according to claim 3, characterized in that: A spiral groove is integrally formed on the side walls of the plurality of control bolts (15); the control bolts (15) are installed in corresponding threaded holes via the spiral groove threads; and a pentagonal hole is formed at the upper end of each control bolt (15).

5. A DC medium voltage cable branch joint connection structure according to claim 1, characterized in that: The fixing component comprises a foam rubber (16) arranged on the side walls of the two square grooves, a connecting block (17) arranged on one side of the two foam rubbers (16), a piston cylinder (18) arranged inside the protective shell (1), a piston plate (19) slidably arranged on the inner wall of the piston cylinder (18), and a connecting pipe (20) arranged between the piston cylinder (18) and the connecting block (17), one end of the connecting block (17) being fixedly connected to the inside of the corresponding foam rubber (16), and one end of the piston plate (19) being provided with a driving assembly.

6. A DC medium voltage cable branch joint connection structure according to claim 5, characterized in that: The driving assembly comprises a sliding rod (21) arranged at one end of a piston plate (19), a reset plate (22) arranged on the sliding rod (21), a fixed plate (23) arranged in the protective shell (1), and a reset spring (24) arranged between the reset plate (22) and the fixed plate (23).

7. A DC medium voltage cable branch joint connection structure according to claim 6, characterized in that: One end of the sliding rod (21) passes through the outer wall of the corresponding protective shell (1).

8. A DC medium voltage cable branch joint connection structure according to claim 7, characterized in that: The distance that the sliding rod (21) extends beyond the outer wall of the protective shell (1) is equal to the length of the plug (9), and the length of the plug (9) is equal to the length of the piston cylinder (18).

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