A joint structure and a joint method for a bellows of a roebel coil

Abstract

The application discloses a joint structure and a joint method for a bellows of a Rogowski coil, and the joint structure comprises a joint assembly connected between two ends of the bellows, the joint assembly comprises a first pipe clamp, a second pipe clamp, an axial compression nut, a first compression module and a second compression module, one end of the bellows is inserted into a hole in the first pipe clamp and is clamped and fixed by the first compression module, and the other end of the bellows is inserted into a hole in the second pipe clamp and is clamped and fixed by the second compression module; an outer thread is arranged on a front end of the first pipe clamp, an annular outer shoulder is arranged on an outer circle of the second pipe clamp, and a rear end of the second pipe clamp is inserted into a hole in the front end of the first pipe clamp, and the first pipe clamp and the second pipe clamp are fixed to each other by the axial compression nut which is sleeved on the outer circle of the rear end of the second pipe clamp; and a cable leading space is arranged on the first pipe clamp. The application is convenient and reliable to insert and connect, and the service life and the measurement precision of the Rogowski coil in a high-temperature environment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Rogowski coil, and particularly relates to a joint structure and joint method of a bellows for a Rogowski coil. BACKGROUND

[0002] The Rogowski coil is a looped spiral coil uniformly wound on a non-ferromagnetic material, which is used for measuring current on a power frequency circuit, and has the advantages of simple structure, light weight and difficulty in saturation under large current. The Rogowski coil does not contain ferromagnetic material, has no magnetic hysteresis effect, almost zero phase error, and no magnetic saturation phenomenon, so the measurement range can be from several amperes to several hundred kiloamperes of current, and there is no direct circuit connection between the Rogowski coil and the measured current, and the response frequency band is 0.1Hz-1MHz. The Rogowski coil outputs the rate of change of the measured current, and the voltage proportional to the measured current can be restored by using an integrator.

[0003] For application occasions requiring current measurement in a high-temperature thermal radiation measurement environment, the Rogowski coil of a conventional structure is easily affected by high-temperature thermal radiation and is aged or damaged, resulting in a significant reduction in the service life of the Rogowski coil; in addition, the measurement accuracy of the Rogowski coil is also affected by high-temperature thermal radiation. SUMMARY

[0004] In order to solve the above problems, the present application provides a joint structure and joint method of a bellows for a Rogowski coil, which aims to improve the service life and measurement accuracy of the Rogowski coil in a high-temperature use environment. The specific technical solutions are as follows:

[0005] The utility model provides a kind of joint structure for the bellows of Roebel coil, including bellows that is sheathed in the periphery of Roebel coil and connecting between the two ends of the bellows joint assembly, the joint assembly includes the first pipe clamp for connecting the one end of bellows, the second pipe clamp for connecting the other end of bellows, the axial compression nut for the front end of the first pipe clamp and the front end of the second pipe clamp are fixedly connected with each other, the first compression module is arranged in the tail end of the first pipe clamp, the second compression module is arranged in the tail end of the second pipe clamp, one end of the bellows is inserted into the inner hole of the first pipe clamp and is fixed by the first compression module, the other end of the bellows is inserted into the inner hole of the second pipe clamp and is fixed by the second compression module;Wherein, the front end of the first pipe clamp is provided with external thread, the middle outer circle of the second pipe clamp is provided with annular outer shoulder, the one end of the threaded inner hole of the axial compression nut is provided with annular inner shoulder, the front end of the second pipe clamp is inserted into the inner hole of the front end of the first pipe clamp, and the first pipe clamp and the second pipe clamp are fixed by the axial compression nut sheathed on the outer circle of the rear end of the second pipe clamp;Wherein, the first pipe clamp is provided with cable lead-out space for leading out the terminal of Roebel coil loaded in the bellows to outside.

[0006] Preferably, the first compression module includes a pair of arc-shaped pressing plates that are oppositely clamped by screws, and the pair of arc-shaped pressing plates include an upper arc-shaped pressing plate and a lower arc-shaped pressing plate.

[0007] Preferably, the arc-shaped pressing surface of the arc-shaped pressing plate is provided with a positioning clamping groove for clamping the corrugated protrusions on the bellows.

[0008] In the utility model, the second compression module includes a pair of half-jacket sleeves, the pair of half-jacket sleeves are split to form a small circular tube at the front end and a large circular tube at the rear end, the inner hole of the small circular tube and the inner hole of the large circular tube have the same diameter and are integrally coaxially connected with each other, a plurality of annular clamping grooves for clamping the corrugated protrusions on the bellows are formed on the inner hole surfaces of the small circular tube and the large circular tube, the outer circle of the small circular tube includes a cylindrical outer circle arranged at the front end of the small circular tube and a conical outer circle arranged at the rear end of the small circular tube, the cylindrical outer circle is inserted and positioned in the inner hole of the second pipe clamp, and the conical outer circle is clamped at the inner hole opening of the second pipe clamp.

[0009] Preferably, a step surface is formed at the adjacent joint of the small circular tube and the large circular tube, and an annular groove is formed on the step surface in the circumferential direction.

[0010] Preferably, the pair of half sleeve clamps are permanently fixed by glue between the half joint surfaces of the pair of half sleeve clamps after clamping the corrugated tube.

[0011] In order to facilitate connection, an outer hexagonal flange is arranged on the outer circle of the first pipe clamp at a position close to the tail end of the outer thread of the first pipe clamp.

[0012] In order to facilitate the lead-out of the terminal of the Rogowski coil from the inside of the corrugated tube, the inner hole of the first pipe clamp is a special-shaped hole, the cross-sectional profile of which is surrounded by the joint of two end portions of an arc-shaped profile and two end portions of a V-shaped profile, and the tip of the V-shaped profile is provided with a transition circular arc; wherein one end of the corrugated tube is positioned on the arc-shaped profile of the special-shaped hole, and the cable lead-out space is formed between the V-shaped profile and the corrugated tube.

[0013] Preferably, an inclined surface is arranged at the upper hole position of the tail end of the first pipe clamp, which is inclined away from the upper arc-shaped pressing plate to prevent the lead-out wire of the terminal of the Rogowski coil from interfering with the upper arc-shaped pressing plate.

[0014] A joining method of a joining structure of a corrugated tube for a Rogowski coil, characterized by comprising the following steps:

[0015] (1) loading the Rogowski coil into the inner hole of the corrugated tube;

[0016] (2) inserting one end of the corrugated tube into the first pipe clamp, positioning the corrugated protrusions on the corrugated tube into the positioning clamping groove of the lower arc-shaped pressing plate at the tail end of the first pipe clamp, and vertically jointing the upper arc-shaped pressing plate with the lower arc-shaped pressing plate and fixing them by screws; when operating, pay attention to lead out the terminal of the Rogowski coil from the cable lead-out space;

[0017] (3) inserting the second pipe clamp into the front end inner hole of the first pipe clamp, and tightening and fixing it by the axial compression nut;

[0018] (4) clamping the other end of the corrugated tube by a pair of half sleeve clamps, positioning the corrugated protrusions on the corrugated tube into the annular clamping groove of the half sleeve clamps; when the pair of half sleeve clamps are clamped, fix them by glue between the half joint surfaces;

[0019] (5) when measuring, bend the corrugated tube into a ring shape to enclose the electric wire to be measured, then insert the small pipe on the half sleeve clamps at the end of the corrugated tube into the rear end inner hole of the second pipe clamp, so that the cylindrical outer circle on the small pipe is positioned into the inner hole of the second pipe clamp, and the conical outer circle on the small pipe is locked with the rear end inner hole of the second pipe clamp, thereby forming the joining structure between the two end portions of the corrugated tube.

[0020] The beneficial effects of the present application are:

[0021] First, the application is a kind of joint structure and joint method for corrugated pipe of Rogowski coil, by sheathing corrugated pipe outside Rogowski coil, the wall thickness of corrugated pipe can be made thicker (thick-walled corrugated pipe still has good bendability), so that the adverse effects of high temperature thermal radiation on Rogowski coil can be effectively shielded, thereby improving the service life and measurement accuracy of Rogowski coil in high temperature environment.

[0022] Second, the application is a kind of joint structure and joint method for corrugated pipe of Rogowski coil, the special design of the joint structure composed of first pipe clamp, second pipe clamp, axial compression nut, arc-shaped pressing plate and half clamp sleeve has reliable positioning connection and convenient plug-in, thereby improving the efficiency of measurement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a kind of joint structure for corrugated pipe of Rogowski coil of the application;

[0024] Figure 2 is Figure 1 explosion structure schematic diagram of

[0025] Figure 3 is the structure schematic diagram of axial compression nut;

[0026] Figure 4 is the structure schematic diagram of first pipe clamp;

[0027] Figure 5 is Figure 4 left view of

[0028] In the figure: 1, corrugated pipe, 2, joint assembly, 3, one end of corrugated pipe, 4, first pipe clamp, 5, the other end of corrugated pipe, 6, second pipe clamp, 7, axial compression nut, 8, first compression module, 9, second compression module, 10, external thread, 11, annular outer shoulder, 12, annular inner shoulder, 13, cable lead-out space, 14, arc-shaped pressing plate, 15, upper arc-shaped pressing plate, 16, lower arc-shaped pressing plate, 17, positioning clamping groove, 18, half clamp sleeve, 19, small round pipe, 20, large round pipe, 21, annular clamping groove, 22, cylindrical outer circle, 23, conical outer circle, 24, step surface, 25, annular groove, 26, outer hexagonal flange, 27, special-shaped hole, 28, arc-shaped contour, 29, V-shaped contour, 30, transition arc, 31, inclined surface. DETAILED DESCRIPTION

[0029] The specific embodiments of the application will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0030] Example 1:

[0031] As Figures 1 to 5 shown is an embodiment of the joint structure of the bellows for the Rogowski coil of the present application, comprising the bellows 1 sheathed on the periphery of the Rogowski coil (not shown in the figure) and the joint assembly 2 connected between the two ends of the bellows 1, the joint assembly 2 comprising the first pipe clamp 4 for connecting one end 3 of the bellows, the second pipe clamp 6 for connecting the other end 5 of the bellows, the axial compression nut 7 for fixedly connecting the front end of the first pipe clamp 4 with the front end of the second pipe clamp 6, the first compression module 8 arranged at the tail end of the first pipe clamp 4, the second compression module 9 arranged at the tail end of the second pipe clamp 6, one end of the bellows 1 inserted into the inner hole of the first pipe clamp 4 is clamped and fixed by the first compression module 8, the other end of the bellows 1 inserted into the inner hole of the second pipe clamp 6 is clamped and fixed by the second compression module 9; wherein a section of the front end of the first pipe clamp 4 is provided with external threads 10, an annular external shoulder 11 is arranged on the middle outer circle of the second pipe clamp 6, an annular inner shoulder 12 is arranged at one end of the threaded inner hole of the axial compression nut 7, a section of the front end of the second pipe clamp 6 is inserted into the inner hole of the front end of the first pipe clamp 4, and the mutual fixation of the first pipe clamp 4 and the second pipe clamp 6 is realized by the axial compression nut 7 sheathed on a section of the outer circle of the rear end of the second pipe clamp 6; wherein the first pipe clamp 4 is provided with a cable lead-out space 13 for leading out the wire terminals of the Rogowski coil installed in the bellows 1 to the outside.

[0032] Preferably, the first compression module 8 comprises a pair of arc-shaped pressing plates 14 which are oppositely clamped by screws, and the pair of arc-shaped pressing plates 14 comprises an upper arc-shaped pressing plate 15 and a lower arc-shaped pressing plate 16; wherein the lower arc-shaped pressing plate 16 is integrally connected to the lower side of the tail end hole of the first pipe clamp 4.

[0033] Preferably, an annular positioning slot 17 for clamping the corrugated protrusions on the bellows 1 is arranged on the arc-shaped pressing surface of the arc-shaped pressing plate 14.

[0034] In the present application, the second compression module 9 comprises a pair of half clamping sleeves 18, the pair of half clamping sleeves 18 are spliced together to form a small circular tube 19 at the front end and a large circular tube 20 at the rear end, the inner hole of the small circular tube 19 and the inner hole of the large circular tube 20 have the same diameter and are integrally coaxially connected to each other; a plurality of annular clamping slots 21 for clamping the corrugated protrusions on the bellows 1 are arranged on the inner hole surfaces of the small circular tube 19 and the large circular tube 20, the outer circle of the small circular tube 19 comprises a cylindrical outer circle 22 arranged at the front end of the small circular tube 19 and a conical outer circle 23 arranged at the rear end of the small circular tube 19, the cylindrical outer circle 22 is inserted and positioned in the inner hole of the second pipe clamp 6, and the conical outer circle 23 is clamped at the inner hole opening position of the second pipe clamp 6.

[0035] Preferably, the small round tube 19 and the large round tube 20 form a step surface 24 at the adjacent joint, and an annular groove 25 is formed on the step surface 24 in the circumferential direction.

[0036] Preferably, the pair of half clamps 18 are permanently fixed by glue between the half joint surfaces of the pair of half clamps 18 after clamping the corrugated tube 1.

[0037] In order to facilitate connection, an outer hexagonal flange 26 is arranged on the outer circle of the first tube clamp 4 at a position close to the tail end of the outer thread of the first tube clamp 4.

[0038] In order to facilitate the lead-out of the lead of the Ruhro coil from the inside of the corrugated tube 1, the inner hole of the first tube clamp 4 is a special-shaped hole 27, the cross-sectional profile of which is formed by the joint of two end portions of an arc-shaped profile 28 and two end portions of a V-shaped profile 29, and the tip of the V-shaped profile 29 is provided with a transition circular arc 30; wherein one end of the corrugated tube 1 is positioned on the arc-shaped profile 28 of the special-shaped hole 27, and the cable lead-out space 13 is formed between the V-shaped profile 29 and the corrugated tube 1.

[0039] Preferably, an inclined surface 31 is arranged on the upper hole portion of the tail end of the first tube clamp 4, which is inclined away from the upper arc-shaped pressing plate 15 to prevent the lead-out wire of the lead of the Ruhro coil from interfering with the upper arc-shaped pressing plate 15.

[0040] Embodiment 2:

[0041] A joining method for the joining structure of the corrugated tube for Ruhro coil of embodiment 1, characterized in that it comprises the following steps:

[0042] (1) loading the Ruhro coil into the inner hole of the corrugated tube 1;

[0043] (2) inserting one end of the corrugated tube 1 into the first tube clamp 4, and positioning the corrugated protrusions on the corrugated tube 1 into the positioning clamping groove 17 of the lower arc-shaped pressing plate 16 at the tail end of the first tube clamp 4, and clamping the upper arc-shaped pressing plate 15 and the lower arc-shaped pressing plate 16 in an upper and lower manner and fixing them by screws; when operating, pay attention to lead out the lead of the Ruhro coil from the cable lead-out space 13;

[0044] (3) inserting the second tube clamp 6 into the front end inner hole of the first tube clamp 4, and fixing it by tightening the axial pressing nut 7;

[0045] (4) clamping the other end of the corrugated tube 1 by a pair of half clamps 18, and positioning the corrugated protrusions on the corrugated tube 1 into the annular clamping groove 21 of the half clamps 18; when clamping the pair of half clamps 18, fix them by glue between the half joint surfaces;

[0046] (5) When measuring, the bellows 1 is bent into a ring to enclose the electric wire to be measured, and then the small pipe 19 on the half sleeve 18 at the end of the bellows 1 is inserted into the rear end inner hole of the second pipe clamp 6, so that the cylindrical outer circle 22 on the small pipe 19 is positioned into the inner hole of the second pipe clamp 6, and the conical outer circle 23 on the small pipe 19 is locked with the rear end inner hole of the second pipe clamp 6, thereby forming the joint structure between the two ends of the bellows 1.

[0047] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the technical principles of the present application, can also make several improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A joint structure for bellows of a Rogowski coil, characterized by, The utility model provides a kind of connecting assembly, which is connected between the bellows including outer sleeve on the periphery of the Rogowski coil and both ends of the bellows, and the connecting assembly includes a first pipe clamp for connecting one end of the bellows, a second pipe clamp for connecting the other end of the bellows, an axial compression nut for fixedly connecting the front end of the first pipe clamp with the front end of the second pipe clamp, a first compression module arranged at the tail end of the first pipe clamp, and a second compression module arranged at the tail end of the second pipe clamp.The one end of the bellows is inserted into the inner hole of the first pipe clamp and is clamped and fixed by the first compression module, and the other end of the bellows is inserted into the inner hole of the second pipe clamp and is clamped and fixed by the second compression module.The front end of the first pipe clamp is provided with external threads, the middle outer circle of the second pipe clamp is provided with an annular external shoulder, the threaded inner hole of the axial compression nut is provided with an annular inner shoulder at one end, and the front end of the second pipe clamp is inserted into the inner hole of the front end of the first pipe clamp, and the first pipe clamp and the second pipe clamp are fixedly connected by the axial compression nut arranged on the outer circle of the rear end of the second pipe clamp.The first pipe clamp is provided with a cable outlet space for leading the terminal of the Rogowski coil arranged in the bellows to the outside.

2. A bellows joint for a Rogowski coil according to claim 1, characterized in that The first compression module includes a pair of arc-shaped pressing plates which are clamped on each other by screws, and the pair of arc-shaped pressing plates includes an upper arc-shaped pressing plate and a lower arc-shaped pressing plate.The lower arc-shaped pressing plate is integrally connected to the lower side of the tail end hole of the first pipe clamp.

3. A bellows joint for a Rogowski coil according to claim 2, wherein, The arc-shaped pressing surface of the arc-shaped pressing plate is provided with a positioning clamping groove for clamping the corrugated protruding part of the bellows.

4. A bellows joint for a Rogowski coil according to claim 3, wherein, The second compression module includes a pair of half-jacket sleeves, and the pair of half-jacket sleeves form a small circular tube at the front end and a large circular tube at the rear end after being spliced, and the inner hole of the small circular tube and the inner hole of the large circular tube have the same diameter and are integrally coaxially connected to each other.A plurality of annular clamping grooves for clamping the corrugated protruding part of the bellows are formed on the inner hole surfaces of the small circular tube and the large circular tube.The outer circle of the small circular tube includes a cylindrical outer circle arranged at the front end of the small circular tube and a conical outer circle arranged at the rear end of the small circular tube, the cylindrical outer circle is inserted and positioned in the inner hole of the second pipe clamp, and the conical outer circle is clamped at the inner hole opening of the second pipe clamp.

5. A bellows joint for a Rogowski coil according to claim 4, characterised in that, A step surface is formed at the adjacent joint of the small circular tube and the large circular tube, and an annular groove is formed on the part of the small circular tube on the step surface in the circumferential direction.

6. A bellows joint for a Rogowski coil according to claim 4, wherein, The pair of half-jacket sleeves are permanently fixed by glue between the half-joint surfaces of the pair of half-jacket sleeves after clamping the bellows.

7. A bellows joint for a Rogowski coil according to claim 1, wherein An outer hexagonal flange is arranged on the outer circle of the first pipe clamp at a position close to the tail end of the external threads of the first pipe clamp.

8. A bellows joint for a Rogowski coil according to claim 1, wherein The inner hole of the first pipe clamp is a special-shaped hole, and the cross-sectional contour of the special-shaped hole is formed by the joint of two end portions of an arc-shaped contour and two end portions of a V-shaped contour, and the sharp portion of the V-shaped contour is provided with a transition circular arc.The one end of the bellows is positioned on the arc-shaped contour of the special-shaped hole, and the cable outlet space is formed between the V-shaped contour and the bellows.

9. A bellows joint for a Rogowski coil according to claim 2, wherein, An inclined surface is arranged on the tail end of the first pipe clamp at the upper hole position, which is inclined away from the upper arc-shaped pressing plate to prevent the lead wire of the Rogowski coil from interfering with the upper arc-shaped pressing plate.

10. A method of joining using the joining structure of the bellows for a Roebel coil according to any one of claims 4 to 6, characterized by, The method comprises the following steps: (1) The Rogowski coil is arranged in the inner hole of the bellows; (2) One end of the bellows is inserted into the first pipe clamp, and the bellows protrusions are positioned in the positioning clamping groove of the lower arc-shaped pressing plate at the tail end of the first pipe clamp, the upper arc-shaped pressing plate is combined with the lower arc-shaped pressing plate, and the screw is fixed; When operating, pay attention to leading the lead wire of the Rogowski coil out of the cable lead-out space; (3) The second pipe clamp is inserted into the inner hole at the front end of the first pipe clamp, and the axial compression nut is tightened and fixed; (4) A pair of half clamps are used to clamp the other end of the bellows, and the bellows protrusions are positioned in the annular clamping groove of the half clamp; When the pair of half clamps are clamped, the half clamps are fixed by glue between the half clamping surfaces; (5) When measuring, the bellows is bent into a ring shape to surround the wire to be measured, and then the small pipe on the half clamp at the end of the bellows is inserted into the rear end inner hole of the second pipe clamp, so that the cylindrical outer circle on the small pipe is positioned in the inner hole of the second pipe clamp, and the conical outer circle on the small pipe is locked with the rear end inner hole of the second pipe clamp, thereby forming the joint structure between the two end portions of the bellows.

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