Impulse voltage generator grounding device

Abstract

The application relates to an impulse voltage generator grounding device and relates to the technical field of power equipment, which comprises a plug pipe, a plug column and a dust removal mechanism, a grounding sleeve is arranged in the plug pipe, and a plurality of air holes are formed in the plug pipe; the plug column can be inserted into the plug pipe, the plug column is provided with a cavity, a convex grounding block is slidably arranged in the cavity, one end of the convex grounding block is connected with an impulse voltage generator, and the convex grounding block can be inserted into the grounding sleeve; the dust removal mechanism comprises an air flow control device communicated with the air holes; the air flow control device can control air flow to enter and exit the plug pipe through the air holes, so that dust in the plug pipe and the plug column is discharged from the air holes. The application has the advantages of reducing dust on the grounding sleeve and the convex grounding block, improving the effective contact area between the convex grounding block and the sleeve, and strengthening the grounding effect.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power equipment, in particular to an impulse voltage generator grounding device. BACKGROUND

[0002] The impulse voltage generator is a high-voltage generating device for generating impulse waves such as lightning impulse voltage waves and operating overvoltage waves with high amplitude and short time, and is a basic test device of a high-voltage laboratory.

[0003] A Chinese patent with the publication number CN108832318A discloses an impulse voltage generator grounding device. When the linkage rod moves downward, the elastic sheet and the small spring are first connected to the grounding sleeve. The thick end of the "convex" grounding block is not connected to the grounding sleeve at this time, and the impulse voltage generator is grounded through the thin end of the "convex" grounding block with resistance, thereby reducing the instantaneous grounding discharge current and the discharge sound. When the linkage rod continues to move downward, the thick end of the "convex" grounding block is connected to the grounding sleeve, thereby realizing resistance-free grounding.

[0004] In the above application, since the two ends of the sleeve are provided with openings, dust is easily accumulated on the inner surface of the grounding sleeve. Dust is usually an insulating or poorly conductive material, which forms an isolation layer between the "convex" grounding block and the sleeve, thereby affecting the contact resistance of the first section. If there is too much dust, the elastic sheet and the small spring may not effectively contact the sleeve, thereby causing the current-limiting resistor to not be correctly connected or the contact resistance to be unstable, which affects the control of the discharge current. This may cause the instantaneous current to be too large, generate sparks and noise, and even damage the equipment.

[0005] Then, when the thick end of the second section of the "convex" grounding block is in contact, if dust exists, the contact area may be reduced and the contact resistance may be increased, thereby affecting the complete discharge effect. In particular, the contact surface of the "convex" design needs to have good conductivity, and dust may cause local poor contact, form partial discharge, or even arc, and aggravate the ablation of the contact. SUMMARY

[0006] The application aims to provide an impulse voltage generator grounding device, which can reduce dust on the grounding sleeve and the "convex" grounding block, increase the effective contact area between the "convex" grounding block and the sleeve, and improve the grounding effect.

[0007] The application provides an impulse voltage generator grounding device, which adopts the following technical scheme: comprising

[0008] The plug-in pipe is internally provided with a grounding sleeve, and a plurality of air holes are formed in the plug-in pipe;

[0009] The plug-in post is inserted into the plug-in tube, and the plug-in post is provided with a cavity, and a convex grounding block is slidably arranged in the cavity, one end of the convex grounding block is connected with the impulse voltage generator, and the convex grounding block can be inserted into the grounding sleeve.

[0010] The dust removal mechanism comprises an air flow control device communicated with the air hole, and the air flow control device can control the air flow to enter or exit the plug-in tube through the air hole, so as to remove the dust in the plug-in tube and the plug-in post from the air hole.

[0011] Optionally, the air flow control device comprises a dust collector, which is used to adsorb the dust in the plug-in tube and the cavity through the air hole during the insertion of the plug-in post into the plug-in tube.

[0012] Optionally, a ring groove is arranged on the inner wall of the plug-in tube, and a sealing ring is arranged in the ring groove, when the plug-in post is inserted into the plug-in tube, the air flow control device extracts air through the air hole, so that a local low pressure area is formed between the contact surface of the plug-in post and the plug-in tube, and the relative fixing effect of the plug-in post and the plug-in tube is enhanced.

[0013] Optionally, the air flow control device comprises a jet device, which is used to destroy the air pressure adsorption and facilitate the separation of the plug-in post and the plug-in tube.

[0014] Optionally, a first channel and a second channel are arranged in the plug-in tube and are communicated with each other, the diameter of the first channel is larger than that of the second channel, the plug-in post can be fixed in the first channel, the grounding sleeve is arranged on the inner wall of the second channel, a recess is arranged on the first channel, the outer wall of the plug-in post is provided with a protruding part corresponding to the recess, and the recess and the protruding part are matched to position the plug-in post inserted into the first channel.

[0015] Optionally, a sealing ball is rotatably arranged on the inner wall of the second channel, a through hole is arranged on the sealing ball and communicated with the first channel and the second channel, and the air flow control device is used to drive the rotation of the sealing ball.

[0016] Optionally, the rotating end of the sealing ball is connected with a driving rod, one end of the driving rod penetrates into the air hole and is provided with a turbine, when the air flow control device controls the air suction, the air flow in the air hole drives the turbine to rotate, and then drives the driving rod to rotate the sealing ball by 90°, so that the through hole is communicated with the first channel and the second channel; when the air flow control device controls the air blowing, the air flow in the air hole drives the turbine to rotate reversely, so as to drive the driving rod to drive the sealing ball to rotate reversely and separate the first channel and the second channel.

[0017] Optionally, a first bevel gear is coaxially connected on the driving rod, a second bevel gear is connected on the turbine driving shaft and engaged with the first bevel gear, and a dust cover is arranged at the connection position of the first bevel gear and the second bevel gear.

[0018] Optionally, a limiting slot is formed on the air hole wall, the driving rod passes through the center of the limiting slot, a limiting rod is fixedly connected to the driving rod, and the limiting rod can rotate in the limiting slot to limit the rotation angle of the sealing ball to 90°.

[0019] Optionally, the turbine is an axial flow impeller, and the blades are designed with asymmetric inclination angles, i.e., 25° on the positive rotation side and 10° on the reverse rotation side.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] 1. When the plug-in column is inserted into the plug-in pipe, the air flow control device can suck air in the air hole, discharge the dust in the cavity of the plug-in column and the plug-in pipe through the air hole, and also discharge the air in the gap between the plug-in column and the plug-in pipe, so that a local low pressure area is formed between the contact surfaces of the plug-in column and the plug-in pipe, the relative fixing effect of the plug-in column and the plug-in pipe is enhanced, and the convex grounding block is not easy to separate from the grounding sleeve.

[0022] 2. The sealing ball can separate the first channel and the second channel, reduce the possibility of dust falling into the grounding sleeve, and when the air flow control device sucks air in the air hole, the turbine can be driven to rotate, the sealing ball can rotate, the through hole on the sealing ball can connect the first channel and the second channel, and the convex grounding block can be inserted into the grounding sleeve through the through hole.

[0023] 3. When the plug-in column and the plug-in pipe are separated, the air injection device can inject high-pressure air flow towards the air hole, instantaneously break the local low pressure area of the plug-in column and the plug-in pipe, and form a gas film lubricating layer at the interface of the sealing ring, so that the axial separation force is suddenly reduced, the separation of the plug-in column and the plug-in pipe is facilitated, and the air injection device can also play a role in reverse dust removal, blowing the dust adsorbed on the sealing ring out of the first channel opening. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the grounding device of the impulse voltage generator according to an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the cross-sectional structure of the separation state of the plug-in column and the plug-in pipe according to an embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the cross-sectional structure of the insertion state of the plug-in column and the plug-in pipe according to an embodiment of the present application;

[0027] Figure 4 is an enlarged schematic diagram of the limiting rod and the limiting slot according to an embodiment of the present application;

[0028] Figure 5It is an explosion structure schematic diagram of a turbine shown by the embodiment of the present application.

[0029] Explanation of reference numerals: 1, plug-in column; 11, cavity; 12, convex grounding block; 13, protruding part; 2, plug-in pipe; 21, grounding sleeve; 22, first channel; 221, recessed part; 222, ring groove; 223, sealing ring; 23, second channel; 3, dust removal mechanism; 31, dust collector; 32, air jet device; 33, air hole; 41, bearing plate; 42, limiting sleeve; 43, cylinder; 44, spring; 45, sliding rod; 46, spring piece; 5, sealing ball; 51, through hole; 52, driving rod; 53, first bevel gear; 54, limiting rod; 55, limiting groove; 6, turbine; 61, second bevel gear; 62, dust cover. DETAILED DESCRIPTION

[0030] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 5 The present application will be further described in detail.

[0031] The present application provides a grounding device for an impulse voltage generator, referring to Figure 1 and Figure 2 , comprising a plug-in pipe 2 and a plug-in column 1, the plug-in pipe 2 is provided with a first channel 22 and a second channel 23 which are in communication with each other, the diameter of the first channel 22 is larger than that of the second channel 23, and the inner wall of the second channel 23 is fixed with a grounding sleeve 21. The plug-in column 1 is provided with a cavity 11, the cavity 11 is slidingly provided with a convex grounding block 12, the plug-in pipe 2 can be inserted into the first channel 22, the convex grounding block 12 is aligned with the second channel 23 and inserted into the grounding sleeve 21, and the discharge of the impulse voltage generator is performed.

[0032] Referring to Figure 2 , the inner wall of the first channel 22 is provided with a recessed part 221, and the outer wall of the plug-in column 1 is provided with a protruding part 13 corresponding to the recessed part 221, and the recessed part 221 and the protruding part 13 are matched to position the plug-in column 1 inserted into the first channel 22.

[0033] The inner walls of the cavity 11 are fixed with a bearing plate 41, the bearing plate 41 is fixedly connected with a limiting sleeve 42, the convex grounding block 12 is fixedly connected with a cylinder 43 which has the same diameter as the limiting sleeve 42, the end of the cylinder 43 is fixedly connected with a sliding rod 45, the bearing plate 41 is provided with a circular hole which is in communication with the limiting sleeve 42, one end of the sliding rod 45 penetrates through the limiting sleeve 42 and the circular hole at the same time, the limiting sleeve 42 and the cylinder 43 are sleeved with the same spring 44, one end of the spring 44 is connected with the bearing plate 41, the other end of the spring 44 is connected with the convex grounding block 12, the thinner end of the convex grounding block 12 is connected with a spring piece 46, and the limiting sleeve 42 and the cylinder 43 are provided to avoid the radial deformation of the spring 44 in the compression process.

[0034] When the plug-in column 1 is inserted into the plug-in pipe 2, the elastic sheet 46 first contacts the grounding sleeve 21, at which time the thinner end of the convex grounding block (with resistance) is first connected to the grounding circuit, and the resistance of the thinner end limits the instantaneous discharge current, avoiding sparks and surges caused by the stepwise release of electric charge. When the plug-in column 1 continues to move, the thicker end of the convex grounding block (without resistance) directly contacts the grounding sleeve 21, achieving complete grounding. The thicker end has no resistance, directly forming a low-impedance grounding path, ensuring that the remaining electric charge is quickly discharged, avoiding the threat of residual voltage to personnel safety.

[0035] When the elastic sheet 46 contacts the grounding sleeve 21, resistance is generated, thereby exerting pressure on the spring 44. The elastic structure of the spring 44 provides cushioning, prolongs the charge release time, reduces mechanical collision noise, and at the same time ensures the stability of the initial contact.

[0036] Referring to Figure 2 , a plurality of air holes 33 are formed in the bottom wall of the first channel 22, and the plurality of air holes 33 are evenly arranged in a ring shape. A dust removal mechanism 3 is arranged in the plug-in pipe 2, and the dust removal mechanism 3 includes an air flow control device in communication with the air holes 33. The air flow control device includes a dust collector 31. When the plug-in column 1 is inserted into the plug-in pipe 2, the inner cavity and the first channel 22 and the second channel 23 form a sealed space. The dust collector 31 can suck away the dust attached to the convex grounding block 12 and discharge it through the air holes 33, thereby improving the connection effect of the convex grounding block 12 and the grounding sleeve 21 and enhancing the discharge performance.

[0037] Referring to Figure 2 , a ring groove 222 is formed in the inner wall of the first channel 22, and a sealing ring 223 is fixed in the ring groove 222. The sealing ring 223 partially penetrates out of the ring groove 222. When the plug-in column 1 is inserted into the plug-in pipe 2, the elastic effect of the sealing ring 223 can enhance the sealing effect between the plug-in column 1 and the plug-in pipe 2. After the plug-in column 1 and the plug-in pipe 2 are connected, the dust collector 31 continues to work, which can suck out the air in the gap between the plug-in column 1 and the plug-in pipe 2, so as to form a local low-pressure area between the contact surfaces of the plug-in column 1 and the plug-in pipe 2, thereby enhancing the relative fixation effect of the plug-in column 1 and the plug-in pipe 2, and preventing the convex grounding block 12 from being separated from the grounding sleeve 21.

[0038] Referring to Figure 3 , the air flow control device further includes a jet device 32. The jet device 32 sprays high-pressure air flow through the air holes 33, which can instantly break the local low-pressure area between the plug-in column 1 and the plug-in pipe 2. At the same time, the air flow can form a gas film lubricating layer at the interface of the sealing ring 223, so that the axial separation force is suddenly reduced, thereby facilitating the separation of the plug-in column 1 and the plug-in pipe 2. At the same time, the jet device 32 can also play a role in reverse dust removal, blowing the dust adsorbed on the sealing ring 223 out of the opening of the first channel 22.

[0039] Referring toFigure 2 and Figure 5 The inner wall of the second channel 23 is rotatably provided with a sealing ball 5, a through hole 51 is formed in the sealing ball 5 and communicates the first channel 22 and the second channel 23, the opening direction of the through hole 51 is perpendicular to the rotation axis of the sealing ball 5, the end of the sealing ball 5 is rotatably fixedly connected with a driving rod 52, one end of the driving rod 52 penetrates into the air hole 33 and is coaxially fixedly connected with a first bevel gear 53, the first bevel gear 53 is engaged with a second bevel gear 61, the driving end of the second bevel gear 61 is connected with a turbine 6, the first bevel gear 53 and the second bevel gear 61 are sleeved with a spherical dust cover 62, the driving rod 52 and the driving end of the second bevel gear 61 are respectively connected with the dust cover 62 through bearings.

[0040] Referring to Figure 2 and Figure 3 A limiting groove 55 is formed in the wall of the air hole 33, the limiting groove 55 is in the shape of a right-angle sector, the driving rod 52 penetrates into the air hole 33 through the center of the limiting groove 55, a limiting rod 54 is fixedly connected with the driving rod 52, the limiting rod 54 can rotate in the limiting groove 55, so as to control the maximum rotation angle of the driving rod 52 and the sealing ball 5 to be 90°. When the plug-in column 1 moves towards the plug-in rod, the air cleaner 31 inhales air into the air hole 33, the airflow flows in the air hole 33 and drives the turbine 6 to rotate, so as to drive the second bevel gear 61 to drive the first bevel gear 53 to rotate, the driving rod 52 drives the limiting rod 54 to rotate in the limiting groove 55 when rotating, until the limiting rod 54 abuts against the groove wall of the limiting groove 55, at this time, the rotation angle of the driving rod 52 is 90°, so that the through hole 51 of the sealing ball 5 communicates the first channel 22 and the second channel 23, thereby facilitating the convex grounding block 12 to penetrate into the grounding sleeve 21 through the through hole 51.

[0041] When the plug-in column 1 is separated from the plug-in pipe 2, the air jet device 32 sprays air into the air hole 33, the airflow drives the turbine 6 to rotate reversely, so as to drive the driving rod 52 to rotate reversely by 90°, and further drive the sealing ball 5 to rotate by 90° in the second channel 23, the through holes 51 at both ends of the sealing ball 5 respectively abut against the inner wall of the second channel 23, thereby playing a role of separating the first channel 22 and the second channel 23, and playing a dustproof effect on the grounding sleeve 21, and reducing the possibility of dust entering the inside of the grounding sleeve 21 from the first channel 22.

[0042] Referring to Figure 5 The turbine 6 is an axial flow impeller, the blade is provided with 4 pieces, the blade cross section adopts an asymmetric airfoil, the blade is provided with a 25° inclination angle on the positive rotation side and a 10° inclination angle on the reverse rotation side, the positive rotation side is convex, the reverse rotation side is concave, and the tip of the blade is designed with a spoiler notch. Since the airflow is small in the air inhaling state, the asymmetric inclination angle makes the concave arc of the blade become the windward surface, which facilitates the airflow to drive the blade to rotate reversely. The spoiler notch can destroy the boundary layer and avoid stagnation, and the blade can still rotate when dust accumulates on the blade.

[0043] The implementation principle of the grounding device of the impact voltage generator is that when the plug-in column 1 moves towards the plug-in rod direction, the cooperation of the protruding part 13 on the plug-in column 1 and the recessed part 221 can make the convex grounding block 12 accurately inserted into the grounding sleeve 21. The outer wall of the plug-in column 1 extrudes the sealing ring 223 during the movement process, thereby closing the opening of the plug-in pipe 2.

[0044] The air flow control device sucks the air in the air hole 33, adsorbs the dust in the convex grounding block 12 and the first channel 22, and collects it into the dust collector 31 through the air hole 33. The dust collector 31 continues to work, can suck out the air in the gap between the plug-in column 1 and the plug-in pipe 2, form a local low pressure area between the contact surface of the plug-in column 1 and the plug-in pipe 2, enhance the relative fixation effect of the plug-in column 1 and the plug-in pipe 2, so that the convex grounding block 12 is not easy to separate from the grounding sleeve 21.

[0045] At the same time, the movement of the air flow in the air hole 33 drives the turbine 6 to rotate, drives the second bevel gear 61 to rotate, drives the driving rod 52 to rotate synchronously under the driving action of the first bevel gear 53, and the limiting rod 54 rotates in the limiting groove 55 following the driving rod 52, so that the limiting rod 54 moves from the groove wall on one side of the limiting groove 55 to the groove wall on the other side, thereby limiting the rotation angle of the driving rod 52 to 90°. At this time, the sealing ball 5 rotates coaxially with the driving rod 52, and the through hole 51 connects the first channel 22 and the second channel 23.

[0046] After the convex grounding block 12 is inserted into the through hole 51 and continues to move downward, the elastic sheet 46 first contacts the grounding sleeve 21, at this time, the thinner end (with resistance) of the convex grounding block is first connected to the grounding loop, and the resistance of the thinner end limits the instantaneous discharge current, avoiding sparks and surges caused by stepwise release of electric charge. When the elastic sheet 46 contacts the grounding sleeve 21, resistance is generated, thereby exerting pressure on the spring 44. The elastic structure of the spring 44 provides buffering and prolongs the charge release time. When the plug-in column 1 continues to move, the thicker end (without resistance) of the convex grounding block directly contacts the grounding sleeve 21, realizing complete grounding. The thicker end without resistance directly forms a low-impedance grounding path, ensuring that the remaining electric charge is quickly discharged and avoiding the threat of residual voltage to personnel safety.

[0047] When the plug post 1 is separated from the plug pipe 2, the air jet device 32 sprays high-pressure air flow through the air hole 33, which breaks the local low-pressure area of the plug post 1 and the plug pipe 2 instantaneously, and at the same time, the air flow can form an air film lubrication layer at the interface of the sealing ring 223, so that the axial separation force drops sharply, facilitating the separation of the plug post 1 and the plug pipe 2. The air jet device 32 can also play a role in reverse dust removal, blowing the dust on the turbine 6 and the sealing ring 223 out of the opening of the first channel 22. At the same time, the air flow will blow the turbine 6 to rotate in the opposite direction, so as to control the sealing ball 5 to separate the first channel 22 and the second channel 23, reducing the dust entering the grounding sleeve 21 from the opening of the plug pipe 2.

[0048] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, wherein the same parts are denoted by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A grounding device for an impulse voltage generator, characterized in that, The system includes a connector (2), which has a grounding sleeve (21) and several air holes (33) inside; a plug (1), which can be inserted into the connector (2), and has a cavity (11) inside. A convex grounding block (12) is slidably disposed in the cavity (11), one end of which is connected to an impulse voltage generator, and the convex grounding block (12) can be inserted into the grounding sleeve (21); and a dust removal mechanism (3), which includes an airflow control device connected to the air holes (33). The airflow control device can control the airflow to enter and exit the connector (2) through the air holes (33) so as to discharge the dust in the connector (2) and the plug (1) from the air holes (33). The insertion tube (2) is provided with a first channel (22) and a second channel (23) that are interconnected. The diameter of the first channel (22) is larger than that of the second channel (23). The insertion post (1) can be fixed in the first channel (22). The grounding sleeve (21) is provided on the inner wall of the second channel (23). The first channel (22) has a recess (221). The outer wall of the insertion post (1) has a protrusion (13) corresponding to the recess (221). The recess (221) and the protrusion (13) cooperate to position the insertion post (1) inserted into the first channel (22). A sealing ball (5) is rotatably disposed on the inner wall of the second channel (23). The sealing ball (5) has a through hole (51) connecting the first channel (22) and the second channel (23). The airflow control device is used to drive the rotation of the sealing ball (5). The rotating end of the sealing ball (5) is connected to a drive rod (52). One end of the drive rod (52) passes through the air hole (33) and is equipped with a turbine (6). When the airflow control device controls the intake, the airflow in the air hole (33) drives the turbine (6) to rotate, thereby driving the drive rod (52) to rotate the sealing ball (5) by 90°, so that the through hole (51) connects the first channel (22) and the second channel (23). When the airflow control device controls the blowing, the airflow in the air hole (33) causes the turbine (6) to rotate in the opposite direction, thereby driving the drive rod (52) to drive the sealing ball (5) to rotate in the opposite direction, separating the first channel (22) and the second channel (23).

2. The grounding device for an impulse voltage generator according to claim 1, characterized in that, The airflow control device includes a vacuum cleaner (31) for adsorbing dust inside the connector (2) and the cavity (11) through the air hole (33) during the insertion of the connector (1) into the connector (2).

3. The impulse voltage generator grounding device according to claim 2, characterized in that, The inner wall of the insertion tube (2) is provided with an annular groove (222) and a sealing ring (223) is provided in the annular groove (222). When the insertion post (1) is inserted into the insertion tube (2), the airflow control device draws air through the air hole (33) to form a local low-pressure area between the contact surface of the insertion post (1) and the insertion tube (2), thereby enhancing the relative fixation effect between the insertion post (1) and the insertion tube (2).

4. A grounding device for an impulse voltage generator according to claim 1, characterized in that, The airflow control device includes a jet device (32) which is used to disrupt pressure adsorption and facilitate the separation of the insertion post (1) and the insertion tube (2).

5. A grounding device for an impulse voltage generator according to claim 1, characterized in that, A first bevel gear (53) is coaxially connected to the drive rod (52), and a second bevel gear (61) that meshes with the first bevel gear (53) is connected to the drive shaft of the turbine (6). A dust cover (62) is provided at the connection between the first bevel gear (53) and the second bevel gear (61).

6. A grounding device for an impulse voltage generator according to claim 5, characterized in that, A limiting groove (55) is provided on the wall of the air hole (33). The driving rod (52) passes through the center of the limiting groove (55). A limiting rod (54) is fixedly connected to the driving rod (52). The limiting rod (54) can rotate in the limiting groove (55) to limit the rotation angle of the sealing ball (5) to 90°.

7. A grounding device for an impulse voltage generator according to claim 2, characterized in that, The turbine (6) is an axial flow impeller with blades designed with asymmetrical tilt angles, 25° on the forward rotation side and 10° on the reverse rotation side.

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