Device and method for sealing and protecting intermediate joint of cable line

Abstract

The invention relates to a sealing protection device and method for an intermediate joint of a cable line, the device comprises a metal glue injection port seat, a first O-shaped sealing ring, a metal sealing cover, a second O-shaped sealing ring, a metal clamping buckle and a sealing rubber cap, and the metal glue injection port seat comprises a bottom connecting wall and a top fixing block; a bottom groove is formed among the bottom of the top fixing block, the bottom connecting wall and the copper shell body. The top surface of the top fixing block is provided with a first sealing ring groove used for installing a first O-shaped sealing ring. A cavity between the metal glue injection port seat and the glue injection port and a cavity between the first O-shaped sealing ring and the first sealing ring groove are filled with the metal sealing covers respectively; a second sealing ring groove for mounting a second O-shaped sealing ring is formed in the outer wall of the bottom of the first sealing ring; the metal clamping buckle is connected with the metal sealing cover and is detachably fixed in the bottom groove; and the sealing rubber cap covers the outer side of the whole structure. Compared with the prior art, the cable has the advantages of firm mechanical performance, good sealing and waterproof performance and the like.

Description

Technical Field

[0001] The invention relates to the field of intermediate joints of cable lines, and in particular to a sealing protection device and method for the intermediate joints of cable lines. Background Art

[0002] In some high-voltage cable lines in the power industry, the intermediate joint products may have problems such as the copper protective shell glue injection port not being firmly fixed and the sealing and waterproofing failing, causing water to enter the copper shell. This phenomenon will cause the intermediate joint product to malfunction and affect the safe operation of the line.

[0003] Currently, the sealing forms of the copper shell injection port for the intermediate joint on the market are: ① The sealing cover hole is directly processed on the copper shell body, and an elliptical PE sealing cover is used; ② A brass threaded hole is welded on the copper shell body, and a sealing ring groove is processed on the top of the threaded hole. A brass threaded cover is used to tighten it and compress the sealing ring.

[0004] The above solution has the following defects:

[0005] For the PE sealing cover type, this sealing structure is single, and its mechanical fastening and sealing and waterproof performance are poor, which easily causes water to enter the copper shell of the connector. During transportation and installation, there is a risk that the PE sealing cover may be lost.

[0006] For the brass threaded cap type, although the sealing structure has strong mechanical properties, the injection port of the copper shell is reduced after welding the threaded hole seat, which affects the installation of the construction workers. In addition, when the construction workers tighten the threaded cap, the axial sealing ring on the threaded hole seat is prone to continuous friction with the threaded cap, causing wear on the surface of the sealing ring, affecting the sealing and waterproof performance of the sealing ring. If excessive force is used during installation, it will also cause the sealing ring to break and the seal to fail. Summary of the invention

[0007] The purpose of the present invention is to provide a sealing protection device and method for the intermediate joint of a cable line in order to overcome the defects of the above-mentioned prior art, such as poor mechanical fastening and sealing and waterproofing performance, and reduced glue injection port affecting the working period.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] A sealing and protecting device for an intermediate joint of a cable line is installed on a copper shell body, the copper shell body is provided with a glue injection port, the sealing and protecting device for the intermediate joint comprises a metal glue injection port seat, a first O-type sealing ring, a metal sealing cover, a second O-type sealing ring, a metal clamping buckle and a sealing rubber cap, the metal glue injection port seat is fixed on the copper shell body and surrounds the glue injection port, the metal glue injection port seat comprises a bottom connecting wall and a top fixing block connected to each other, forming an inverted and hollow convex-shaped structure; a bottom groove is formed between the bottom of the top fixing block and the bottom connecting wall and the copper shell body, a first sealing ring groove is provided on the top surface of the top fixing block, and the first O-type sealing ring is installed in the first sealing ring groove;

[0010] The metal sealing cover is an inverted convex structure, and fills the cavity between the metal injection port seat and the injection port, and the cavity between the first O-ring and the first sealing ring groove respectively; the bottom outer wall of the metal sealing cover is provided with a second sealing ring groove, the second O-ring is installed in the second sealing ring groove, and abuts against the side wall of the cavity between the metal injection port seat and the injection port; the metal clamping buckle is connected to the edge of the metal sealing cover, and is detachably fixed in the bottom groove along the side wall of the metal injection port seat; the sealing rubber cap is coated on the outside of the injection port, the metal injection port seat, the metal sealing cover and the metal clamping buckle.

[0011] Furthermore, the metal sealing cover includes a bottom cylindrical portion and a top cylindrical portion which are connected to each other, the cross-sectional diameter of the bottom cylindrical portion is smaller than the cross-sectional diameter of the top main body portion, and the bottom of the top cylindrical portion is provided with a protrusion which cooperates with the cavity between the first O-ring and the first sealing ring groove.

[0012] Furthermore, the sealing rubber cap is interference-fitted with the metal glue injection port seat, the metal sealing cover and the metal clamping buckle.

[0013] Furthermore, silicone grease lubricant is coated in both the first sealing ring groove and the second sealing ring groove.

[0014] Furthermore, the metal injection port seat and the copper shell body are an integrally formed structure.

[0015] Furthermore, there are multiple metal clamping buckles, which are evenly distributed on the edge of the metal sealing cover.

[0016] Furthermore, the metal clip is snap-fitted and fixed in the bottom groove.

[0017] Furthermore, the metal clamping buckle can be rotatably connected to the metal sealing cover.

[0018] The present invention also provides an intermediate joint sealing method using the intermediate joint sealing protection device of a cable line as described above, comprising the following steps:

[0019] After injecting glue on the middle joint of the cable line to be sealed, clean the top of the metal injection port seat and the first sealing ring groove;

[0020] Place the first O-ring in the first sealing ring groove, and place the second O-ring in the second sealing ring groove;

[0021] Install the metal sealing cover connected with the metal clamping buckle on the metal injection port seat, fill the cavity between the metal injection port seat and the injection port, so that the second O-ring abuts against the side wall of the cavity between the metal injection port seat and the injection port; and fill the cavity between the first O-ring and the first sealing ring groove;

[0022] The metal clamping buckle of the metal sealing cover is clamped and fixed in the bottom groove of the metal injection port seat;

[0023] A sealing rubber cap is installed on the outer sides of the glue injection port, the metal glue injection port seat, the metal sealing cover and the metal clamping buckle.

[0024] Furthermore, before installing the first O-ring and the second O-ring, the method further comprises: applying silicone grease lubricant in the first sealing ring groove of the metal injection port seat and the second sealing ring groove of the metal sealing cover.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The present invention changes the traditional sealing method of adding a sealing cover to the glue injection port of the intermediate joint and welding a brass threaded hole. The longitudinal extension of the glue injection port is achieved by arranging a metal glue injection port seat on the glue injection port, and a first sealing ring groove and a bottom groove are formed on the top. The first layer of sealing is achieved by the metal sealing cover on the metal glue injection port seat, and a first O-type sealing ring is arranged in the first sealing ring groove, which cooperates with the filling of the metal sealing cover to achieve the sealing between the metal sealing cover and the top of the metal glue injection port seat; a second sealing ring groove is arranged on the bottom side wall of the metal sealing cover and cooperates with the second O-type sealing ring to achieve the sealing between the side wall of the metal sealing cover and the inner wall of the metal glue injection port seat; and a metal clamp is used to cooperate with the bottom groove of the metal glue injection port seat to achieve convenient disassembly and clamping fixation; finally, the sealing rubber cap is used to achieve the overall sealing;

[0027] This solution achieves triple waterproof sealing of the metal sealing cover, ensures the sealing and waterproof performance of the metal sealing cover, and ensures the strong mechanical performance of the metal sealing cover through the metal clamping buckle and the sealing rubber cap. Compared with the metal threaded seat injection port, the product of this solution increases the inner diameter of the injection port and shortens the installation time of the injection; and can effectively solve the problem of traditional sealing cover loss.

[0028] (2) When installing the metal sealing cover, the present invention only squeezes the first O-ring and the second O-ring without continuous rotation and friction. In addition, silicone grease lubricant is coated in the first sealing ring groove and the second sealing ring groove, which can further reduce the impact of friction on the O-ring and effectively avoid sealing and waterproof failure caused by breakage of the O-ring.

[0029] (3) The present invention can ensure the strong mechanical properties of the metal sealing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a sealing protection device for an intermediate joint of a cable line provided in an embodiment of the present invention;

[0031] In the figure, 1. copper shell body, 101. glue injection port, 2. metal glue injection port seat, 201. bottom connecting wall, 202. top fixing block, 203. bottom groove, 204. first sealing ring groove, 3. first O-ring, 4. metal sealing cover, 401. second sealing ring groove, 402. bottom column part, 403. top column part, 404. protrusion, 5. second O-ring, 6. metal clamping buckle, 7. sealing rubber cap. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides an intermediate joint sealing protection device for a cable line, which is installed on a copper shell body 1. The copper shell body 1 is provided with a glue injection port 101. The intermediate joint sealing protection device includes a metal glue injection port seat 2, a first O-type sealing ring 3, a metal sealing cover 4, a second O-type sealing ring 5, a metal clamping buckle 6 and a sealing rubber cap 7. The metal glue injection port seat 2 is fixed on the copper shell body 1 and surrounds the glue injection port 101. The metal glue injection port seat 2 includes a bottom connecting wall 201 and a top fixing block 202 that are connected to each other, forming an inverted and hollow convex-shaped structure; a bottom groove 203 is formed between the bottom of the top fixing block 202 and the bottom connecting wall 201 and the copper shell body 1, and a first sealing ring groove 204 is provided on the top surface of the top fixing block 202. The first O-type sealing ring 3 is installed in the first sealing ring groove 204;

[0040] The metal sealing cover 4 is an inverted convex-shaped structure, and fills the cavity between the metal injection port seat 2 and the injection port 101, and the cavity between the first O-ring 3 and the first sealing ring groove 204 respectively; the bottom outer wall of the metal sealing cover 4 is provided with a second sealing ring groove 401, and the second O-ring 5 is installed in the second sealing ring groove 401 and abuts against the side wall of the cavity between the metal injection port seat 2 and the injection port 101; the metal clamping buckle 6 is connected to the edge of the metal sealing cover 4 and is detachably fixed in the bottom groove 203 along the side wall of the metal injection port seat 2; the sealing rubber cap 7 is coated on the outer side of the injection port 101, the metal injection port seat 2, the metal sealing cover 4 and the metal clamping buckle 6.

[0041] The present invention changes the traditional sealing method of adding a sealing cover to the glue injection port 101 of the intermediate joint and welding a brass threaded hole. The longitudinal extension of the glue injection port 101 is achieved by arranging a metal glue injection port seat 2 on the glue injection port 101, and a first sealing ring groove 204 at the top and a bottom groove 203 are formed. The first layer of sealing is achieved by the metal sealing cover 4 on the metal glue injection port seat 2, and a first O-type sealing ring 3 is arranged in the first sealing ring groove 204, and the metal sealing cover 4 is filled to achieve the sealing between the metal sealing cover 4 and the top of the metal glue injection port seat 2; a second sealing ring groove 401 is arranged on the bottom side wall of the metal sealing cover 4, and the second O-type sealing ring 5 is cooperated to achieve the sealing between the side wall of the metal sealing cover 4 and the inner wall of the metal glue injection port seat 2; and the metal clamping buckle 6 is used to cooperate with the bottom groove 203 of the metal glue injection port seat 2 to achieve convenient disassembly and clamping fixation; finally, the sealing rubber cap 7 is used to achieve the overall sealing;

[0042] This solution achieves a triple waterproof seal for the metal sealing cover 4, ensures the sealing and waterproof performance of the metal sealing cover 4, and ensures the firm mechanical performance of the metal sealing cover 4 through the metal clamping buckle 6 and the sealing rubber cap 7. Compared with the metal threaded seat injection port 101, the product of this solution increases the inner diameter of the injection port 101, shortens the installation time of the injection, and can effectively solve the problem of the traditional sealing cover being lost.

[0043] Specifically, the metal sealing cover 4 includes a bottom column portion 402 and a top column portion 403 which are connected to each other. The cross-sectional diameter of the bottom column portion 402 is smaller than the cross-sectional diameter of the top main body portion. The bottom of the top column portion 403 is provided with a protrusion 404 which cooperates with the cavity between the first O-ring 3 and the first sealing ring groove 204.

[0044] The protrusion 404 is not necessary to be set. The first O-ring 3 and the first sealing ring groove 204 can be set to have an interference fit, and the top of the first O-ring 3 overflows from the first sealing ring groove 204, so that there is no cavity between the first O-ring 3 and the first sealing ring groove 204. At this time, the bottom of the top column part 403 abuts against the first O-ring 3, and there is no need to set the protrusion 404.

[0045] Preferably, the sealing rubber cap 7 is interference-fitted with the metal injection port seat 2 , the metal sealing cover 4 and the metal clamping buckle 6 to achieve a tight connection.

[0046] The first sealing ring groove 204 and the second sealing ring groove 401 are both coated with silicone grease lubricant, which can reduce the friction between the O-ring and the corresponding groove, and avoid the failure of sealing and waterproofing caused by the breakage of the O-ring.

[0047] Optionally, the metal glue injection port seat 2 and the copper shell body 1 are an integrally formed structure.

[0048] There are multiple metal clamping buckles 6 evenly distributed on the edge of the metal sealing cover 4 .

[0049] Each metal clamping buckle 6 can be rotatably connected to the metal sealing cover 4 and is clamped and fixed in the bottom groove 203 .

[0050] In this embodiment, the number of the metal clamping buckles 6 is two, which are relatively arranged on the edge of the metal sealing cover 4. Three, four or six buckles may also be arranged, and there is no sole limitation.

[0051] Example 2

[0052] This embodiment provides an intermediate joint sealing method using an intermediate joint sealing protection device of a cable line as in Embodiment 1, comprising the following steps:

[0053] After injecting glue on the middle joint of the cable line to be sealed, clean the top of the metal injection port seat 2 and the first sealing ring groove 204;

[0054] Place the first O-ring 3 in the first sealing ring groove 204, and place the second O-ring 5 in the second sealing ring groove 401;

[0055] The metal sealing cover 4 connected with the metal clamping buckle 6 is installed on the metal injection port seat 2, and the cavity between the metal injection port seat 2 and the injection port 101 is filled, so that the second O-ring 5 abuts against the side wall of the cavity between the metal injection port seat 2 and the injection port 101; and the cavity between the first O-ring 3 and the first sealing ring groove 204 is filled;

[0056] The metal clamping buckle 6 of the metal sealing cover 4 is clamped and fixed in the bottom groove 203 of the metal injection port seat 2;

[0057] A sealing rubber cap 7 is installed on the outer sides of the glue injection port 101 , the metal glue injection port seat 2 , the metal sealing cover 4 and the metal clamping buckle 6 .

[0058] Preferably, the above method further comprises: applying silicone grease lubricant in the first sealing ring groove 204 of the metal injection port seat 2 and the second sealing ring groove 401 of the metal sealing cover 4 before installing the first O-ring 3 and the second O-ring 5 .

[0059] It should be noted that the beneficial effects of the method of the present application can be found in the above-mentioned device embodiments and will not be described in detail here.

[0060] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A sealing protection device for an intermediate joint of a cable line, mounted on a copper shell body (1), wherein a glue injection port (101) is provided on the copper shell body (1), characterized in that: The intermediate joint sealing protection device comprises a metal glue injection port seat (2), a first O-type sealing ring (3), a metal sealing cover (4), a second O-type sealing ring (5), a metal clamping buckle (6) and a sealing rubber cap (7); the metal glue injection port seat (2) is fixed on the copper shell body (1) and surrounds the glue injection port (101); the metal glue injection port seat (2) comprises a bottom connecting wall (201) and a top fixing block (202) connected to each other, forming an inverted and hollow convex-shaped structure; a bottom groove (203) is formed between the bottom of the top fixing block (202) and the bottom connecting wall (201) and the copper shell body (1); a first sealing ring groove (204) is provided on the top surface of the top fixing block (202); and the first O-type sealing ring (3) is installed in the first sealing ring groove (204); The metal sealing cover (4) is an inverted convex-shaped structure, and fills the cavity between the metal injection port seat (2) and the injection port (101), and the cavity between the first O-type sealing ring (3) and the first sealing ring groove (204) respectively; the bottom outer wall of the metal sealing cover (4) is provided with a second sealing ring groove (401), and the second O-type sealing ring (5) is installed in the second sealing ring groove (401) and abuts against the side wall of the cavity between the metal injection port seat (2) and the injection port (101); the metal clamping buckle (6) is connected to the edge of the metal sealing cover (4) and is detachably fixed in the bottom groove (203) along the side wall of the metal injection port seat (2); the sealing rubber cap (7) is coated on the outer sides of the injection port (101), the metal injection port seat (2), the metal sealing cover (4) and the metal clamping buckle (6).

2. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The metal sealing cover (4) comprises a bottom column portion (402) and a top column portion (403) which are connected to each other, the cross-sectional diameter of the bottom column portion (402) is smaller than the cross-sectional diameter of the top main body portion, and the bottom of the top column portion (403) is provided with a protrusion (404) which matches with the cavity between the first O-ring (3) and the first sealing ring groove (204).

3. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The sealing rubber cap (7) is interference-fitted with the metal glue injection port seat (2), the metal sealing cover (4) and the metal clamping buckle (6).

4. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The first sealing ring groove (204) and the second sealing ring groove (401) are both coated with silicone grease lubricant.

5. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The metal glue injection port seat (2) and the copper shell body (1) are an integrally formed structure.

6. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The number of the metal clamping buckles (6) is multiple and evenly distributed on the edge of the metal sealing cover (4).

7. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The metal clamping buckle (6) is clamped and fixed in the bottom groove (203).

8. The sealing and protecting device for the intermediate joint of a cable line according to claim 1, characterized in that: The metal clamping buckle (6) can be rotatably connected to the metal sealing cover (4).

9. A method for sealing an intermediate joint of a cable line using the intermediate joint sealing protection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: After injecting glue on the middle joint of the cable line to be sealed, cleaning the top of the metal glue injection port seat (2) and the first sealing ring groove (204); Placing a first O-ring (3) in the first sealing ring groove (204), and placing a second O-ring (5) in the second sealing ring groove (401); The metal sealing cover (4) connected with the metal clamping buckle (6) is installed on the metal glue injection port seat (2), and the cavity between the metal glue injection port seat (2) and the glue injection port (101) is filled, so that the second O-type sealing ring (5) abuts against the side wall of the cavity between the metal glue injection port seat (2) and the glue injection port (101); and the cavity between the first O-type sealing ring (3) and the first sealing ring groove (204) is filled; The metal clamping buckle (6) of the metal sealing cover (4) is clamped and fixed in the bottom groove (203) of the metal injection port seat (2); A sealing rubber cap (7) is installed on the outer sides of the glue injection port (101), the metal glue injection port seat (2), the metal sealing cover (4) and the metal clamping buckle (6).

10. The method according to claim 9, characterized in that The method further comprises, before installing the first O-ring (3) and the second O-ring (5), applying silicone grease lubricant to the first sealing ring groove (204) of the metal injection port seat (2) and the second sealing ring groove (401) of the metal sealing cover (4).

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