Secondary collision buffering device based on inertia driving

Abstract

The invention discloses a secondary collision buffering device based on inertia driving. The secondary collision buffering device comprises a buffering shell, a connecting assembly and a buffering counterweight assembly. The buffer shell is arranged on a closing and opening transmission part of the switch equipment through a connecting assembly, and a buffer cavity is formed in the buffer shell; the buffer counterweight assembly is arranged in the buffer cavity of the buffer shell, can freely move in the buffer cavity and collides with the buffer cavity; the buffer shell and the buffer counterweight assembly can synchronously move along with a closing and opening transmission part of the switch equipment, when the closing and opening transmission part stops moving due to collision of closing or opening, the buffer shell can synchronously stop moving, and the buffer counterweight assembly can continue moving based on inertia and collides with the buffer cavity for the second time. The generated collision force can weaken or counteract the collision counterforce borne by the switching-on and switching-off transmission part due to collision, the switching-on rebound or switching-off rebound of the switch equipment is weakened or counteracted, the rebound risk of the switch equipment during switching-on and switching-off is eliminated as much as possible, and meanwhile the buffering performance of the switch equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and particularly to a secondary collision buffer device based on inertial drive. Background Art

[0002] Switchgear undertakes the responsibilities of power distribution and fault removal in the power system and is a node of the power system network.

[0003] During the closing process of the switchgear, the closing and opening drive system is driven by the closing driving force to drive the moving contact in the conductive circuit to be reliably docked with the static contact according to the designed mechanical characteristics after docking, so as to realize the closing operation of the switchgear; during the opening process, the closing and opening drive system is driven by the opening driving force to drive the moving contact in the conductive circuit to separate from the static contact, and then continue to move according to the designed mechanical characteristics until the opening position and be reliably maintained, so as to realize the opening operation of the switchgear; among them, the closing and opening drive system of the switchgear includes a direct-acting closing and opening drive system or a rotary closing and opening drive system.

[0004] In the normal closing and opening operations of switchgear, overshoot, bounce, and rebound are likely to occur, which will also bring some impacts. There are various reasons for these situations, including impact collision of rigid components, elastic deformation of some components, clearance of the transmission chain, magnitude of the closing and opening speed, magnitude of the equivalent moving mass of the drive system, shape of the colliding parts, etc.

[0005] Among them, elastic deformation of some components and clearance of the transmission chain can be reduced or even eliminated in the design and in lean manufacturing; the shape of the colliding parts can be optimized in the design to reduce the impact. However, the equivalent moving mass of the drive system is inevitable, the impact collision of rigid components is inevitable, and of course the closing and opening speed must be ensured; and as the voltage level and current level of the switchgear increase, the equivalent moving mass and the closing and opening speed also increase accordingly, resulting in more serious impact collision of rigid components and more serious collision rebound produced therewith.

[0006] In order to reduce the rebound caused by collision and suppress the negative impact on the closing and opening of the switchgear resulting therefrom, in the existing designs, buffer devices, transmission chain matching designs, counterweights, lean manufacturing, etc. are widely used.

[0007] Among them, the opening buffer is a widely used technology. During the opening process of the switchgear, when the drive system contacts the opening buffer and the opening buffer comes into play, when it functions normally, the opening characteristics can be effectively improved, but at the moment when the drive system just contacts the opening buffer, the rebound generated by the collision of the rigid parts of the two still generally exists and is difficult to adjust.

[0008] Closing buffer devices are also used in a small number of limited cases. Although the closing mechanical characteristics are improved accordingly, negative impacts on the conductive circuit are also generated, such as local welding due to insufficient contact pressure, and negative impacts on the opening mechanical characteristics, such as the decrease in the initial opening speed of the switchgear.

[0009] The technical solution of counterweight is also used when adjusting the mechanical characteristics to change the matching of the moving mass, so as to adjust mechanical characteristic indexes such as the overall average speed of closing and opening, or the linear speed distribution of a certain part during the closing and opening processes. However, its weakening effect on the closing and opening impact collisions and the resulting rebounds is limited.

[0010] The ways such as the design of the transmission chain cooperation and precision machining are also widely applied, but the closing and opening impact collisions and the resulting rebound phenomena still exist generally.

[0011] That is to say, among the existing ways to weaken the collision rebounds as above, although the degree of rebound during the closing and opening processes of the switchgear is weakened to a certain extent, there is still a risk of closing and opening rebounds. Summary of the Invention

[0012] In view of this, the present invention provides a secondary collision buffer device based on inertial drive, which can weaken or eliminate the bounce generated during the closing process of the switchgear or the rebound generated during the opening process, minimize or eliminate the risk of rebound when the switchgear closes and opens as much as possible, and at the same time helps to improve the buffer performance of the switchgear.

[0013] To achieve the above object, the present invention provides the following technical solution:

[0014] A secondary collision buffer device based on inertial drive for suppressing the rebound when the switchgear closes and opens, comprising: a buffer housing, a connection component and a buffer counterweight component;

[0015] The buffer housing is arranged on the closing and opening transmission part of the switchgear through the connection component, and has a buffer cavity therein;

[0016] The buffer counterweight component is arranged in the buffer cavity of the buffer housing, and can move freely in the buffer cavity and collide with the buffer cavity;

[0017] Wherein, the buffer housing and the buffer counterweight component can move synchronously with the closing and opening transmission part of the switchgear. When the closing and opening transmission part stops moving due to collision during closing or opening, the buffer housing can stop moving synchronously, and the buffer counterweight component can continue to move based on inertia and collide with the buffer cavity for the second time, and the generated collision force can weaken or offset the collision reaction force received by the closing and opening transmission part due to the collision.

[0018] Preferably, the moving direction of the buffer counterweight assembly is the same as that of the closing and opening transmission part;

[0019] Wherein, when the closing and opening transmission part stops moving due to collision during closing or opening, the buffer counterweight assembly continues to move based on inertia and generates a collision force when colliding with the buffer cavity for the second time, which is opposite to the collision reaction force received by the closing and opening transmission part due to the collision.

[0020] Preferably, the buffer housing is connected to the middle part of the closing and opening transmission part through the connection assembly;

[0021] Or, the buffer housing is connected to the end of the closing and opening transmission part through the connection assembly and contacts the buffer of the switchgear when the switchgear is in the open state.

[0022] Preferably, the buffer housing is connected between the first component and the second component of the closing and opening transmission part through the connection assembly;

[0023] Or, the buffer housing is connected to the first component of the closing and opening transmission part through the connection assembly and contacts the buffer of the switchgear when the switchgear is in the open state; wherein, the first component is close to the buffer.

[0024] Preferably, the buffer housing is connected between the first component and the second component of the closing and opening transmission part through the connection assembly;

[0025] The connection assembly includes: a first connection assembly and a second connection assembly;

[0026] One end of the first connection assembly is connected to one end of the first component, and the other end is connected to one end of the buffer housing;

[0027] One end of the second connection assembly is connected to the other end of the buffer housing, and the other end is connected to one end of the second component.

[0028] Preferably, the first connection assembly and / or the second connection assembly includes a connecting rod.

[0029] Preferably, the buffer housing is connected to the first component of the closing and opening transmission part through the connection assembly;

[0030] Wherein, one end of the connection assembly is connected to the buffer housing, and the other end is connected to the first component.

[0031] Preferably, the connection assembly includes a connecting rod or a connecting block.

[0032] Preferably, the shape of the buffer housing includes, but is not limited to, cylindrical, rectangular, or drum-shaped.

[0033] Preferably, the buffer weight assembly includes, but is not limited to, an integral block-shaped weight structure, a multi-piece superimposed weight structure, a multi-strip superimposed weight structure, or a multi-grain superimposed weight structure.

[0034] As can be seen from the above technical solutions, the secondary collision buffer device based on inertial drive provided by the present invention utilizes the secondary collision formed by the buffer weight assembly based on inertia and the buffer housing to weaken or offset the closing rebound force or opening rebound force of the switching device, thereby weakening or offsetting the closing rebound or opening rebound of the switching device, that is, used to weaken or eliminate the bounce generated during the closing process of the switching device or the rebound generated during the opening process, and to minimize or eliminate the risk of rebound during the closing and opening of the switching device, while helping to improve the buffer performance of the switching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1.1 is the ideal closing mechanical characteristic curve of the switching device;

[0037] Figure 1.2 is the ideal opening mechanical characteristic curve of the switching device;

[0038] Figure 1.3 is the normal closing mechanical characteristic curve of the switching device;

[0039] Figure 1.4 is the normal opening mechanical characteristic curve of the switching device;

[0040] Figure 2.1 is a schematic diagram of the switching device's direct-acting transmission system in the opening state;

[0041] Figure 2.2 is a schematic diagram of the switching device's direct-acting transmission system in the intermediate state between opening and closing;

[0042] Figure 2.3 is a schematic diagram of the switching device's direct-acting transmission system in the closing state;

[0043] Figure 3.1 is a schematic diagram of the switching device's rotary transmission system in the opening state;

[0044] Figure 3.2 Schematic diagram of the rotary drive system of the switchgear in the intermediate state between opening and closing;

[0045] Figure 3.3 Schematic diagram of the rotary drive system of the switchgear in the closed state;

[0046] Figure 4.1 Front view of the structure of the buffer device provided by the embodiment of the present invention;

[0047] Figure 4.2 For Figure 4.1 A - A cross-sectional view;

[0048] Figure 4.3 Top view of the structure of the buffer device provided by the embodiment of the present invention;

[0049] Figure 4.4 Schematic diagram of the structure of the buffer device provided by the embodiment of the present invention;

[0050] Figure 4.5 Schematic diagram of the buffer weight assembly provided by the embodiment of the present invention with a multi - sheet stacked structure;

[0051] Figure 4.6 Schematic diagram of the buffer weight assembly provided by the embodiment of the present invention with a multi - grain stacked structure;

[0052] Figure 4.7 Front view of the structure of the buffer device provided by another embodiment of the present invention;

[0053] Figure 4.8 For Figure 4.7 C - C cross-sectional view;

[0054] Figure 4.9 Top view of the structure of the buffer device provided by another embodiment of the present invention;

[0055] Figure 4.10 Schematic diagram of the structure of the buffer device provided by another embodiment of the present invention;

[0056] Figure 4.11 Front view of the structure of the buffer device provided by yet another embodiment of the present invention;

[0057] Figure 4.12 For Figure 4.11 D - D cross-sectional view;

[0058] Figure 4.13 Top view of the structure of the buffer device provided by yet another embodiment of the present invention;

[0059] Figure 4.14 Front view of the structure of the buffer device provided by yet another embodiment of the present invention;

[0060] Figure 4.15 is Figure 4.14 the sectional view taken along line B-B;

[0061] Figure 4.16 is the top view of the structure of the buffer device provided by yet another embodiment of the present invention;

[0062] Figure 4.17 is the schematic structural view of the buffer device provided by yet another embodiment of the present invention;

[0063] Figure 4.18 is the schematic view of the synchronous movement of the buffer device provided by the embodiment of the present invention;

[0064] Figure 4.19 is the schematic view of the buffer housing stopping movement and the buffer counterweight assembly moving by inertia provided by the embodiment of the present invention;

[0065] Figure 4.20 is the schematic view of the buffer housing being subjected to a rebounding force and the buffer counterweight assembly moving by inertia provided by the embodiment of the present invention;

[0066] Figure 4.21 is the schematic view of the collision between the buffer counterweight assembly and the buffer housing provided by the embodiment of the present invention;

[0067] Figure 5 is the schematic view of the setting of the buffer device in the direct-acting transmission system of the switchgear provided by the embodiment of the present invention;

[0068] Figure 5.1 is the schematic view of the direct-acting transmission system of the switchgear provided with the buffer device in the open state provided by the embodiment of the present invention;

[0069] Figure 5.2 is the schematic view of the direct-acting transmission system of the switchgear provided with the buffer device in the intermediate closing position provided by the embodiment of the present invention;

[0070] Figure 5.3 is the schematic view of the collision between the moving and static contacts of the direct-acting transmission system of the switchgear provided with the buffer device provided by the embodiment of the present invention;

[0071] Figure 5.4 is the schematic view of the operation of the buffer counterweight assembly of the direct-acting transmission system of the switchgear provided with the buffer device provided by the embodiment of the present invention;

[0072] Figure 5.5 is the schematic view of the collision of the buffer counterweight assembly of the direct-acting transmission system of the switchgear provided with the buffer device provided by the embodiment of the present invention;

[0073] Figure 5.6Schematic diagram of the buffer counterweight assembly of the direct-acting transmission system of the switchgear provided with a buffer device after collision and falling back in the embodiment of the present invention;

[0074] Figure 5.7 Schematic diagram of the direct-acting transmission system of the switchgear provided with a buffer device in the closed state in the embodiment of the present invention;

[0075] Figure 5.8 Schematic diagram of the direct-acting transmission system of the switchgear provided with a buffer device in the closed state in the embodiment of the present invention;

[0076] Figure 5.9 Schematic diagram of the direct-acting transmission system of the switchgear provided with a buffer device in the middle position of closing in the embodiment of the present invention;

[0077] Figure 5.10 Schematic diagram of the buffer counterweight assembly of the direct-acting transmission system of the switchgear provided with a buffer device at the upper part in the embodiment of the present invention;

[0078] Figure 5.11 Schematic diagram of the direct-acting transmission system of the switchgear provided with a buffer device colliding with a buffer in the embodiment of the present invention;

[0079] Figure 5.12 Schematic diagram of the buffer counterweight assembly of the direct-acting transmission system of the switchgear provided with a buffer device colliding downward in the embodiment of the present invention;

[0080] Figure 5.13 Schematic diagram of the direct-acting transmission system of the switchgear provided with a buffer device in the open state in the embodiment of the present invention;

[0081] Figure 6.1 Schematic diagram of the rotary transmission system of the switchgear provided with a buffer device in the open state in the embodiment of the present invention;

[0082] [[ID=5 Schematic diagram of the rotary transmission system of the switchgear provided with a buffer device in the middle position of closing in the embodiment of the present invention;

[0083] ​ Schematic diagram of the moving and static contacts of the rotary transmission system of the switchgear provided with a buffer device colliding in the embodiment of the present invention;

[0084] ​ Schematic diagram of the buffer counterweight assembly of the rotary transmission system of the switchgear provided with a buffer device acting in the embodiment of the present invention;

[0085] ​ Schematic diagram of the buffer counterweight assembly of the rotary transmission system of the switchgear provided with a buffer device colliding in the embodiment of the present invention;

[0086] ​ Schematic diagram of the buffer counterweight assembly of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention falling back after a collision;

[0087] ​ Schematic diagram of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention maintaining the closing state;

[0088] ​ Schematic diagram of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention being in the closing state;

[0089] ​ Schematic diagram of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention being in the middle position during closing;

[0090] ​ Schematic diagram of the buffer counterweight assembly of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention being in the upper part;

[0091] ​ Schematic diagram of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention colliding with the buffer;

[0092] ​ Schematic diagram of the buffer counterweight assembly of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention colliding downward;

[0093] ​ Schematic diagram of the rotating drive system of the switchgear provided with a buffer device in the embodiments of the present invention maintaining the opening state.

[0094] Among them, 1 is a support frame, 2 is a transmission shaft, 3 is a transmission crank arm, 4 is a first connecting rod, 5 is a buffer, 6 is a second connecting rod, 7 is an insulating pull rod, 8 is a moving contact, 9 is a static contact, 101 is a buffer crank arm, 102 is a buffer roller, and 401 is a driving mechanism;

[0095] 201 is a connecting component, 202 is a buffer housing, 203 is a buffer counterweight assembly, and 204 is a buffer cavity. Detailed implementation manners

[0096] Regarding the above background art, the following further explanations are needed:

[0097] (1) Ideal closing and opening stroke curves of the switchgear

[0098] During the closing and opening operations of the switchgear, the movement trajectory of the moving contact in the main current-carrying circuit is measured to obtain the stroke-time curve of the moving contact of the switchgear, that is, the mechanical characteristic curve.

[0099] The mechanical characteristic curves corresponding to the relatively ideal closing and opening operations of the switchgear are shown in ​ and ​ .

[0100] It can be seen from ​ that during the relatively ideal closing process, under the action of the closing driving force and the transmission system, the moving contact moves from the open position to the closed position, and after reaching the closed position, it remains stable without overshoot and rebound, and the main circuit changes from the open state to the conducting state.

[0101] It can be seen from ​ that during the relatively ideal opening process, under the action of the opening driving force and the transmission system, the moving contact moves from the closed position to the open position, and after reaching the open position, it remains stable without overshoot and rebound, and the main circuit changes from the conducting state to the open state.

[0102] (2) The normal closing and opening stroke curves of the switchgear

[0103] In normal switchgear, due to the influence of the impact and collision of rigid components of moving parts, the influence of mass inertia, the elastic deformation of some components, the influence of the clearance of the transmission chain, etc., overshoot, rebound and other situations occur during the closing and opening operations of the switchgear. The corresponding mechanical characteristic curves are shown in ​ and ​ .

[0104] It can be seen from ​ that during the normal closing process, under the action of the closing driving force and the transmission system, the moving contact moves from the open position to the closed position. After reaching the closed position, due to the influence of the elastic deformation of some components, the influence of the clearance of the transmission chain, the influence of mass inertia, etc., a certain overshoot occurs, and due to the influence of the impact and collision of rigid components, the elastic deformation of some components, etc., a certain rebound is formed; although the amplitudes of overshoot and rebound are not large, they have an impact on the closing of the switchgear, including the main circuit being affected by bounce and frequently turning on and off, the contacts generating arcs and being ablated and worn due to frequent turning on and off, the system generating overvoltage due to frequent turning on and off, and the transmission system being damaged or having its life and reliability reduced due to impact.

[0105] It can be seen from ​It can be seen that during the normal opening process, the moving contact moves from the closing position to the opening position under the action of the opening driving force and the transmission system. When the moving parts collide with the opening buffer, due to the influence of the impact of rigid components and other reasons, a certain rebound is formed. Then, it continues to open under the opening drive and may form one or more rebounds. The amplitude of the rebound is affected by multiple factors such as the magnitude of the opening speed, the equivalent moving mass of the transmission system, the shape and mass of the colliding parts, etc. However, the impact of rigid components is the main factor. The rebound has an impact on the opening, including various adverse effects such as the insulation effect between the static and moving contacts, damage to the transmission system due to impact, or reduction of its life and reliability.

[0106] (3) The normal closing and opening transmission system of the switchgear

[0107] The switchgear uses a variety of transmission systems to achieve closing and opening operations. Common transmission systems include direct-acting transmission (i.e., direct-acting transmission system), rotating multi-link transmission (i.e., rotating transmission system), etc.

[0108] 1) Schematic diagram of the closing and opening process of the direct-acting transmission system

[0109] There are various forms of the direct-acting transmission system, and the overall method is basically the same. The following uses a set of schematic diagrams of the closing and opening process of the direct-acting transmission system for illustration. The schematic diagrams of the closing and opening process of the direct-acting transmission system are shown in ​ .

[0110] Closing operation process of the direct-acting transmission system:

[0111] In ​ the opening state, the driving mechanism 401 drives the transmission shaft 2, drives the insulating rod 7 and the moving contact 8, and makes the moving contact 8 move towards the static contact 9. When the transmission shaft 2 is separated from the buffer 5, an intermediate opening / closing state is formed, such as the intermediate opening / closing state in ​ . The insulating rod 7 and the moving contact 8 continue to move under the driving force until the moving contact 8 collides with the static contact 9. The moving contact 8, the insulating rod 7, and the transmission shaft 2 are held in position by the transmission system, completing the closing operation and reaching the closing state, such as the closing state in ​ .

[0112] During the closing process, if there is no closing overshoot and closing bounce of different magnitudes after the static and moving contacts collide, it is an ideal closing mechanical characteristic, as shown in ​ .

[0113] During the closing process, after the static and moving contacts collide, it is highly probable that closing overshoot and closing bounce of different magnitudes will occur, forming the normal closing mechanical characteristic, as shown in ​ .

[0114] Opening operation process of the direct-acting transmission system:

[0115] In ​ in the closing state, the driving mechanism 401 drives the transmission shaft 2, drives the insulating pull rod 7 and the moving contact 8, so that the moving contact 8 disengages from the static contact 9 and moves in the reverse direction. When the moving contact 8 is separated from the static contact 9, a mid-state between opening and closing is formed, as ​ in the mid-state between opening and closing in, the insulating pull rod 7 and the moving contact 8 continue to move under the driving force until the transmission shaft 2 collides with the buffer 5. The moving contact 8, the insulating pull rod 7, and the transmission shaft 2 are held in position by the transmission system, completing the opening operation and reaching the opening state, as ​ shown in the opening state in.

[0116] During the opening process, if there is no overshoot and bounce of different magnitudes during the collision of the driving transmission rod with the buffer, it is an ideal opening mechanical characteristic, as ​ shown.

[0117] During the opening process, after the driving transmission rod collides with the buffer, it is highly probable that overshoots and rebounds of different magnitudes will occur, forming the usual opening mechanical characteristic, as ​ shown.

[0118] 2) Schematic diagram of the opening and closing process of the rotary transmission system

[0119] There are various forms of the rotary transmission system, and the overall method is basically the same. The following uses a set of schematic diagrams of the opening and closing process of the rotary transmission system for illustration. The schematic diagrams of the opening and closing process of the rotary transmission system are shown in ​ .

[0120] Opening operation process of the rotary transmission system:

[0121] In ​ in the opening state in, the driving mechanism is installed in the support frame 1, drives the transmission shaft 2, drives the transmission crank arm 3, the first link 4, and the second link 6 in the four-bar linkage transmission system, drives the insulating pull rod 7 and the moving contact 8, so that the moving contact 8 moves towards the static contact 9. When the buffer crank arm 101 relatively fixed on the transmission shaft 2 drives the buffer roller 102 to separate from the buffer 5, a mid-state between opening and closing is formed, as ​ in the mid-state between opening and closing in. Under the driving force, the transmission crank arm 3, the first link 4, and the second link 6 drive the insulating pull rod 7 and the moving contact 8 to continue moving until the moving contact 8 collides with the static contact 9. The moving contact 8, the insulating pull rod 7, the second link 6, the first link 4, the transmission crank arm 3, and the transmission shaft 2 are held in position by the transmission system, completing the closing operation and reaching the closing state, as ​ shown in the closing state in.

[0122] During the closing process, if there is no closing overshoot and closing bounce of different magnitudes after the moving and static contacts collide, it is an ideal closing mechanical characteristic, as ​ shown.

[0123] During the closing process, after the moving and static contacts collide, it is highly probable that closing overshoot and closing bounce of different magnitudes will occur, forming the usual closing mechanical characteristic, as ​ shown.

[0124] Opening operation process of the rotary drive system

[0125] In ​ the closing state, the drive mechanism installed in the support frame 1 drives the drive shaft 2, driving the transmission crank arm 3, the first link 4, and the second link 6 in the four-link transmission system, driving the insulating pull rod 7 and the moving contact 8, separating the moving contact 8 from the static contact 9 and moving in the reverse direction. When the moving contact 8 is separated from the static contact 9, a mid-state between opening and closing is formed, as ​ shown in the mid-state between opening and closing. Under the driving force, the transmission crank arm 3, the first link 4, and the second link 6 drive the insulating pull rod 7 and the moving contact 8 to continue moving until the buffer roller 102 driven by the buffer crank arm 101 relatively fixed on the drive shaft 2 collides with the buffer 5. The moving contact 8, the insulating pull rod 7, the second link 6, the first link 4, the transmission crank arm 3, and the drive shaft 2 are held in position by the transmission system, completing the opening operation and reaching the opening state, as ​ shown in the opening state.

[0126] During the opening process, if there is no opening overshoot and opening bounce of different magnitudes after the buffer roller 102 collides with the buffer 5, it is an ideal opening mechanical characteristic, as ​ shown.

[0127] During the opening process, after the buffer roller 102 collides with the buffer 5, it is highly probable that opening overshoot and opening bounce of different magnitudes will occur, forming the usual opening mechanical characteristic, as ​ shown.

[0128] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0129] The secondary collision buffer device based on inertial drive provided by the embodiments of the present invention is used to suppress the rebound of the switchgear during opening and closing, as ​As shown, the buffer device includes: a buffer housing 202, a connection assembly 201, and a buffer weight assembly 203;

[0130] The buffer housing 202 is arranged on the closing and opening transmission part of the switchgear through the connection assembly 201, such as ​ shown, and it has a buffer cavity 204 inside;

[0131] Such as ​ shown, the buffer weight assembly 203 is arranged in the buffer cavity 204 of the buffer housing 202, and can move freely in the buffer cavity 204 and collide with the buffer cavity 204;

[0132] Among them, the buffer housing 202 and the buffer weight assembly 203 can move synchronously with the closing and opening transmission part of the switchgear. When the closing and opening transmission part stops moving due to collision during closing or opening, the buffer housing 202 can stop moving synchronously, and the buffer weight assembly 203 can continue to move based on inertia and collide with the buffer cavity 204 for the second time, and the generated collision force can weaken or offset the collision reaction force received by the closing and opening transmission part due to collision.

[0133] It should be noted that, as ​ shown, the buffer housing 202 is the buffer cavity body. As ​ shown, the inside of the buffer housing 202 has a buffer cavity 204 (i.e., a buffer cavity). The buffer housing 202 can be a closed structure, and the degree of closure needs to meet that the buffer weight assembly 203 can be wrapped by the buffer cavity 204 of the buffer housing 202 without loss, and the space size of the buffer cavity 204 can allow the buffer weight assembly 203 to move freely therein, that is, the space of the buffer cavity 204 is larger than the volume of the buffer weight assembly 203, and a guiding assembly can be arranged in the buffer cavity 204 to guide the movement of the buffer weight assembly 203;

[0134] The buffer weight assembly 203 can move freely from one end of the buffer cavity 204 to the other end based on inertia in the buffer cavity 204 of the buffer housing 202 and collide with this end of the buffer cavity 204; the buffer housing 202 is arranged on the closing and opening transmission part of the switchgear through the connection assembly 201, that is, this buffer device is arranged in the closing and opening transmission system of the switchgear through the connection assembly, so that the buffer housing 202 and the buffer weight assembly 203 can move synchronously with the closing and opening transmission part of the switchgear;

[0135] When the closing and opening drive part of the switchgear moves to switch to the closing state or the opening state as required, the buffer housing 202 and the buffer weight assembly 203 can move synchronously with the closing and opening drive part of the switchgear. When the closing and opening drive part stops moving due to a collision during closing or opening, the buffer housing 202 will stop moving synchronously, while the buffer weight assembly 203 can continue to move in the original direction of motion based on inertia, and then collide with the buffer cavity 204 for the second time. The collision force generated by the second collision between the buffer weight assembly 203 and the buffer cavity 204 can weaken or offset the collision reaction force suffered by the closing and opening drive part due to the collision, thereby effectively weakening or eliminating the bounce generated during the closing process and the rebound generated during the opening process of the switchgear, minimizing or eliminating the risk of rebound during closing and opening of the switchgear, and at the same time helping to improve the buffering performance of the switchgear.

[0136] It should be further noted that the second collision between the buffer weight assembly 203 and the buffer cavity 204 refers to the collision that occurs when the buffer weight assembly 203 continues to move based on inertia and then collides with the buffer cavity 204 after the closing and opening drive part collides during closing or opening; that is to say, the collision caused by the closing action or the opening action of the closing and opening drive part occurs first, and then the buffer weight assembly 203 continues to move based on inertia and collides with the buffer cavity 204. The second collision between the buffer weight assembly 203 and the buffer cavity 204 is not two collisions between the buffer weight assembly 203 and the buffer cavity 204.

[0137] Among them, during the closing or opening process of the switchgear, the buffer device can move synchronously with the closing and opening drive part (i.e., the moving part) of the switchgear through the connecting component 201. At the initial stage of the closing action movement of the switchgear, the buffer weight assembly 203 is at the inner bottom of the buffer housing 202 under the action of inertia; when the closing action reaches the moment when the moving contact collides with the static contact, the buffer housing 202 tends to stop moving synchronously with the moving part, and has a tendency to rebound synchronously when the moving contact rebounds due to the collision; at this time, the buffer weight assembly 203 continues to move in the original direction of motion inside the buffer cavity 204 and collides with the other end of the buffer housing 202 for the second time. The generated collision force can weaken or offset the closing rebound force suffered by the moving contact due to the collision, that is, weaken or offset the closing rebound amplitude of the moving contact, that is, weaken or offset the closing bounce.

[0138] In the initial stage of the opening operation of the switchgear, the buffer weight assembly 203 is at the bottom inside the buffer housing 202 due to inertia; when the opening operation reaches the point where the moving part collides with the opening limit or the opening buffer of the switchgear, the buffer housing 202 tends to stop moving synchronously with the moving part, and there is a tendency to rebound synchronously when the moving part collides with the opening limit or the opening buffer of the switchgear; at this time, the buffer weight assembly 203 continues to move in the original moving direction inside the buffer housing 202 and collides with the bottom of the buffer housing 202 for the second time, and the generated collision force can weaken or offset the opening rebound force received when the moving part collides with the opening limit or the opening buffer of the switchgear, thus weakening or offsetting the opening rebound amplitude.

[0139] In addition, to better understand the working process and buffering principle of this inertia-driven secondary collision buffer device, the upward movement process is taken as an example for illustration:

[0140] The buffer device of this solution is arranged in the closing and opening transmission part (i.e., the transmission system) of the switchgear and can move synchronously with the closing and opening transmission part during the closing and opening operations of the switchgear. When the buffer device moves upward with the closing operation of the closing and opening transmission part of the switchgear, the buffer housing 202 drives the buffer weight assembly 203 to move upward synchronously, as ​ shown; when the closing and opening transmission part stops moving due to a collision, the buffer housing 202 will stop moving synchronously, while the buffer weight assembly 203 will continue to move upward due to inertia, as ​ and ​ shown; the collision reaction force received by the closing and opening transmission part due to the collision is gradually transmitted to the buffer housing 202, and the buffer weight assembly 203 collides with the buffer housing 202 after inertial movement, and the generated collision force weakens or even offsets the collision reaction force received by the closing and opening transmission part due to the collision, as ​ shown, thereby weakening or offsetting the downward rebound movement of the buffer housing 202, that is, weakening or offsetting the rebound of the moving contact.

[0141] It can be seen from this that this solution provides a buffer device for suppressing rebound in a switchgear. By using the secondary collision formed by the buffer weight assembly based on inertia and the buffer housing, the closing rebound force or the opening rebound force of the switchgear is weakened or offset, thereby weakening or offsetting the closing rebound or the opening rebound of the switchgear, and thus used to weaken or eliminate the bounce generated during the closing process or the rebound generated during the opening process of the switchgear; of course, this buffer device can be used to replace components such as rollers of the collision general buffer used in general switchgears.

[0142] In other words, this solution provides a rebound-suppressing buffer device for switchgear, which can better meet the rebound control requirements during the switchgear closing and opening processes, improve the switchgear's mechanical operating performance, and thus enhance the switchgear's closing and opening electrical performance. Of course, the inertia-driven secondary collision buffer device provided by this solution can be used in the direct-acting closing and opening transmission section of the switchgear, or in the rotary closing and opening transmission section of the switchgear. Details are described below.

[0143] In this solution, the movement direction of the buffer weight assembly 203 is the same as the movement direction of the closing and opening transmission part;

[0144] Among them, when the closing and opening transmission part stops moving due to a collision when closing or opening the switch, the buffer counterweight assembly 203 continues to move based on inertia and collides with the buffer cavity 204 for the second time, generating a collision force that is opposite to the collision reaction force received by the closing and opening transmission part due to the collision.

[0145] It should be noted that the above solution is applicable to the direct-acting closing and opening transmission part of the switchgear; ​ As shown, the buffer housing 202 can be set on the direct-acting closing and opening transmission part (i.e., the direct-acting closing and opening transmission system) of the switch device through the connecting component 201. The movement direction of the buffer counterweight component 203 is the same as the movement direction of the direct-acting closing and opening transmission part. This is because the direct-acting closing and opening transmission part moves linearly, which will also drive the buffer housing 202 to move linearly synchronously. The structure of the direct-acting closing and opening transmission part of the switch device can be referred to. ​ 、 ​ or ​ As shown, the movement direction of the direct-acting closing and opening switch transmission part can be the up and down direction, and accordingly, the buffer counterweight assembly 203 can move downward or upward based on inertia; in addition, when the direct-acting closing and opening switch transmission part stops moving due to a collision when closing or opening the switch, the buffer counterweight assembly 203 will continue to move based on inertia, and then the collision force generated by the secondary collision with the buffer chamber 204 is opposite to the collision reaction force received by the direct-acting closing and opening switch transmission part due to the collision. In this way, it is used to weaken or offset the collision reaction force received by the closing and opening switch transmission part due to the collision, thereby suppressing the rebound of the direct-acting switching device when closing and opening the switch.

[0146] Specifically, the buffer housing 202 is connected to the middle part of the closing and opening transmission part through the connecting assembly 201;

[0147] Alternatively, the buffer housing 202 is connected to the end of the closing and opening transmission part through the connecting assembly 201, and contacts the buffer 5 of the switching device when the switching device is in the opening state.

[0148] It should be noted that the above solution can be applied to the direct-acting closing and opening drive part and the rotary closing and opening drive part (i.e., the rotary closing and opening drive system) of the switchgear; among them, the buffer housing 202 can be connected to the middle part or the end part of the direct-acting closing and opening drive part of the switchgear through the connecting component 201, and can also be connected to the middle part or the end part of the rotary closing and opening drive part of the switchgear. In particular, the buffer housing 202 is connected to the end part of the direct-acting closing and opening drive part or the rotary closing and opening drive part of the switchgear through the connecting component 201. The buffer housing 202 also needs to contact the buffer 5 of the switchgear when the switchgear is in the open state. In this way, when the direct-acting closing and opening drive part or the rotary closing and opening drive part stops moving due to a collision during opening, the collision force generated by the secondary collision of the buffer counterweight assembly 203 continuing to move based on inertia with the buffer cavity 204 is opposite to the collision reaction force received by the direct-acting closing and opening drive part or the rotary closing and opening drive part due to the collision. Furthermore, it is used to weaken or offset the collision reaction force received by the direct-acting closing and opening drive part or the rotary closing and opening drive part due to the collision, so as to suppress the rebound of the direct-acting switchgear or the rotary switchgear during opening. That is to say, regardless of whether the buffer housing 202 is connected to the middle part or the end part of the closing and opening drive part through the connecting component 201, it can achieve the effect of suppressing the rebound of the switchgear during closing and opening. Of course, how the buffer housing 202 is connected to the middle part or the end part of the closing and opening drive part through the connecting component 201 to achieve the effect of suppressing the rebound of the switchgear during closing and opening can be seen in the description of the closing and opening processes of the direct-acting closing and opening drive part (equipped with this buffer device) of the switchgear below.

[0149] Furthermore, the buffer housing 202 is connected between the first component and the second component of the closing and opening drive part through the connecting component 201;

[0150] Or, the buffer housing 202 is connected to the first component of the closing and opening drive part through the connecting component 201 and contacts the buffer 5 of the switchgear when the switchgear is in the open state; among them, the first component is close to the buffer 5.

[0151] It should be noted that for the direct-acting closing and opening drive part of the switchgear, the buffer housing 202 can be connected between the first component and the second component of the direct-acting closing and opening drive part through the connecting component 201, or connected to the first component of the direct-acting closing and opening drive part and contacts the buffer 5 of the switchgear when the switchgear is in the open state; among them, the first component of the direct-acting closing and opening drive part can be the drive shaft 2 (close to the buffer 5), and the second component can be the insulating pull rod 7, as ​As shown, the buffer housing 202 can be connected to the direct-acting closing and opening drive part through the connecting component 201; of course, the buffer housing 202 can also be connected to the insulating pull rod 7 and the moving contact 8 of the direct-acting closing and opening drive part through the connecting component 201.

[0152] For the rotary closing and opening drive part of the switchgear, the buffer housing 202 can be connected between the first component and the second component of the rotary closing and opening drive part through the connecting component 201, or connected to the first component of the rotary closing and opening drive part and in contact with the buffer 5 of the switchgear when the switchgear is in the open state; wherein, the first component of the rotary closing and opening drive part can be the transmission shaft 2 (close to the buffer 5), and the second component can be the transmission crank arm 3; that is to say, whether the buffer housing 202 is connected between the two components of the closing and opening drive part or at the end of the component close to the buffer 5 through the connecting component 201, it can play the role of suppressing the rebound of the switchgear during closing and opening, and this buffer device is connected to the closing and opening drive part in this way, without changing the layout of the closing and opening drive part, nor the transmission action mode and process of the closing and opening drive part, nor the control mode of the closing and opening drive part.

[0153] Furthermore, as described above, the buffer housing 202 is connected between the first component and the second component of the closing and opening drive part through the connecting component 201.

[0154] Among them, the connecting component 201 includes: a first connecting component and a second connecting component.

[0155] One end of the first connecting component is connected to one end of the first component, and the other end is connected to one end of the buffer housing 202.

[0156] One end of the second connecting component is connected to the other end of the buffer housing 202, and the other end is connected to one end of the second component. That is to say, the buffer housing 202 is connected between the first component and the second component of the closing and opening drive part through two connecting components, one connecting component is connected between one end of the first component and one end of the buffer housing 202, and the other connecting component is connected between the other end of the buffer housing 202 and one end of the second component, which can make the connection of the buffer housing 202 between the first component and the second component of the closing and opening drive part firm and reliable; of course, for both the direct-acting closing and opening drive part and the rotary closing and opening drive part, the buffer housing 202 is connected between its first component and second component in this way.

[0157] More specifically, the first connecting component and / or the second connecting component includes a connecting rod. Among them, as ​ shown, the first connecting component can be the first connecting rod, and the second connecting component can be the second connecting rod; for the direct-acting closing and opening drive part, as ​As shown, the lower end of the first connecting rod can be connected to the upper end of the transmission shaft 2 of the direct-acting closing and opening transmission part, and the upper end can be connected to the bottom end of the buffer housing 202; the lower end of the second connecting rod can be connected to the top end of the buffer housing 202, and the upper end can be connected to the lower end of the insulating pull rod 7 of the direct-acting closing and opening transmission part, which makes the buffer housing 202 connected between the lower end of the insulating pull rod 7 and the upper end of the transmission shaft 2 of the direct-acting closing and opening transmission part through the upper and lower connecting rods; in addition, as ​ shown, the first connecting rod and the second connecting rod can be round rods or threaded rods; moreover, the connection of one end of the above-mentioned connecting rod to the corresponding component can be by welding, screwing or connection and fixation through other fasteners.

[0158] That is to say, the buffer housing 202 of this buffer device can be connected between the transmission shaft 2 and the insulating pull rod 7 of the direct-acting closing and opening transmission part through two connecting rods, with a simple structure and easy to implement.

[0159] In this solution, as described above, the buffer housing 202 is connected to the first component of the closing and opening transmission part through the connection assembly 201;

[0160] wherein, one end of the connection assembly 201 is connected to the buffer housing 202, and the other end is connected to the first component.

[0161] Specifically, the connection assembly 201 includes a connecting rod or a connecting block. Among them, for the direct-acting closing and opening transmission part, the connection assembly 201 can adopt a connecting rod, the lower end of which is connected to the top wall of the buffer housing 202, and the upper end is connected to the lower end of the transmission shaft 2; for the rotary closing and opening transmission part, the connection assembly 201 can adopt a connecting block, as ​ shown, one end of the connecting block is connected to the outer side wall of the buffer housing 202, and the other end is connected to the transmission shaft 2. Of course, the connection assembly 201 is designed in this way, with a simple structure and convenient connection, and other structural forms can also be adopted, such as connecting columns or connecting seats, etc., which will not be elaborated here.

[0162] Furthermore, the shape of the buffer housing 202 includes but is not limited to a cylindrical shape (as ​ shown), a rectangular shape (as ​ shown) or a drum shape (as ​ shown). Among them, as ​ shown, the shape of the buffer housing 202 is cylindrical, that is, the buffer housing 202 is a hollow cylindrical structure, and its buffer cavity 204 can be a cylindrical buffer cavity. Correspondingly, the first connecting rod and the second connecting rod can be round rods, and the overall buffer weight assembly 203 can be a cylindrical structure and can be located at the bottom of the cylindrical buffer cavity; as ​ or ​As shown, the shape of the buffer housing 202 is rectangular, even though the buffer housing 202 is a hollow cuboid structure; in addition, if this buffer device is arranged on the transmission shaft 2 of the rotary closing and opening drive part of the switchgear, such as ​ As shown, the shape of the buffer housing 202 can preferably be drum-shaped.

[0163] Furthermore, the buffer weight assembly 203 includes but is not limited to an integral block-shaped weight structure (such as ​ As shown), a multi-piece stacked weight structure (such as ​ As shown), a multi-strip stacked weight structure or a multi-grain stacked weight structure (such as ​ As shown). Among them, the integral block-shaped weight structure can adopt an integral metal block structure, the multi-piece stacked weight structure can adopt a structure of multiple metal sheets stacked, the multi-strip stacked weight structure can adopt a structure of multiple metal strips stacked, and the multi-grain stacked weight structure can adopt a structure of multiple metal particles stacked, that is, a plurality of metal particles can be filled at the bottom in the buffer cavity 204 of the buffer housing 202. In this way, when the closing and opening drive part stops moving due to collision during closing or opening, the buffer weight assembly 203 continues to move based on inertia and the collision force generated by the secondary collision with the buffer cavity 204 is relatively thick and uniform, so as to better weaken or offset the collision reaction force received by the closing and opening drive part due to collision; of course, the buffer housing 202 is a closed structure and can adopt a detachable open cover structure form, which is convenient for loading the above-mentioned buffer weight assembly 203.

[0164] That is to say, the structural form of the buffer weight assembly 203 can be selected from the integral block-shaped weight structure, the multi-piece stacked weight structure and the multi-grain stacked weight structure according to functional requirements, and the selection basis is the required action time for suppressing the rebound of the switchgear, and the structural form and mass of the buffer weight assembly 203 can be obtained through experimental tests or simulation analysis.

[0165] In addition, it should be noted that, as ​ As shown, the buffer housing 202 is arranged between the transmission shaft 2 of the direct-acting closing and opening drive part and the insulating pull rod 7 through the connecting component 201;

[0166] Or, the buffer housing 202 is arranged at the end of the transmission shaft 2 of the direct-acting closing and opening drive part through the connecting component 201 and contacts the buffer 5 of the switchgear when the switchgear is in the open state. In this way, the buffer device is connected to the middle part or the end of the direct-acting closing and opening drive part of the switchgear, which is convenient for the buffer weight assembly 203 to better weaken or offset the collision reaction force received by the direct-acting closing and opening drive part due to collision, so that the direct-acting switchgear can have better buffer performance during closing and opening. Of course, this buffer device can also be arranged between the insulating pull rod 7 and the moving contact 8.

[0167] As described above, the present buffer device can be arranged in the direct-acting drive system (i.e., the direct-acting closing and opening drive part) of the switchgear; wherein, the buffer device is connected to the direct-acting drive system through the connecting component 201; in this embodiment, the buffer housing 202 can be in a cylindrical form, and the buffer counterweight component 203 can be in a structure form of multiple granular superposed counterweights; of course, the structural forms of the buffer housing 202 and the buffer counterweight component 203 do not affect and change the functions and characteristics of the present buffer device.

[0168] 1) Closing process of the direct-acting drive system:

[0169] As ​ shown, the switchgear starts to close from the open state;

[0170] As ​ shown, the drive shaft 2, the insulating pull rod 7 and the buffer device of the direct-acting drive system drive the moving contact 8 to move towards the static contact 9 under the driving force of the driving mechanism 401; after the drive system is separated from the buffer 5, the switchgear presents an intermediate closing state. In this process, the buffer housing 202 drives the buffer counterweight component 203 and moves towards the static contact 9 synchronously with the drive shaft 2, the insulating pull rod 7 and the moving contact 8 of the drive system;

[0171] As ​ shown, the moving contact 8 collides with the static contact 9, the moving contact 8 stops moving, restricting the movement of the drive shaft 2, the insulating pull rod 7 and the moving contact 8 of the drive system, and the buffer housing 202 also stops moving; at the same time, the collision reaction force of the moving contact 8 and the static contact 9 is transmitted downward along the moving contact 8, the insulating pull rod 7 and the buffer housing 202. Meanwhile, the buffer counterweight component 203 continues to move upward along the original moving direction under the action of inertia;

[0172] As ​ shown, the collision reaction force of the moving and static contacts is transmitted downward. At the same time, the buffer counterweight component 203 continues to move upward under the action of inertia and moves and collides with the upper part of the buffer housing 202;

[0173] As ​ shown, under the action of the collision reaction force of the moving and static contacts, the buffer housing 202 has a tendency to move downward or starts to move downward, that is, it may rebound or has started to rebound; at this time, the buffer counterweight component 203 moves upward under the action of inertia and collides with the upper part of the buffer housing 202 for the second time, and the collision force generated by the collision weakens or cancels the collision reaction force of the moving and static contacts, thereby weakening or canceling the downward rebound of the moving contact 8;

[0174] As ​As shown, after the buffer counterweight assembly 203 collides with the buffer housing 202, under the combined action of the collision force between the two and the self-weight of the buffer counterweight assembly 203, the buffer counterweight assembly 203 falls back to the lower part of the buffer housing 202. The transmission shaft 2 of the transmission system, the insulating pull rod 7, the moving contact 8, and the buffer housing 202 stop moving and remain in the fully closed position under the closing holding force of the switchgear drive mechanism 401;

[0175] As ​ shown, the transmission shaft 2 of the transmission system, the insulating pull rod 7, the moving contact 8, and the buffer housing 202 stop moving and remain in the fully closed position under the closing holding force of the switchgear drive mechanism 401. The buffer counterweight assembly 203 returns to its initial position in the buffer housing 202, and the closing operation is completed.

[0176] That is to say, the present solution provides a buffer device for suppressing rebound in switchgear. When the switchgear closes, it can weaken or suppress the closing rebound and bounce of the switchgear without affecting other functions of the switchgear, which is a function not available in traditional switchgear;

[0177] 2) Tripping process of the direct-acting transmission system:

[0178] As ​ shown, when the switchgear trips from the closed state, at this time, the buffer counterweight assembly 203 remains in the position after the previous closing, that is, the buffer counterweight assembly 203 is at the bottom of the buffer housing 202. Under the driving force of the drive mechanism 401, the moving contact 8 moves away from the static contact 9;

[0179] As ​ shown, after the moving contact 8 is separated from the static contact 9, the switchgear presents an intermediate closing state. During this process, the transmission shaft 2 in the transmission system, the insulating pull rod 7, and the buffer housing 202 of the buffer device move synchronously, and the buffer counterweight assembly 203 remains in its original position (bottom) due to inertia;

[0180] As ​ shown, the transmission shaft 2, the insulating pull rod 7, and the buffer housing 202 in the transmission system drive the buffer counterweight assembly 203 to perform a synchronous tripping action and move towards the tripping position;

[0181] As ​ shown, the transmission shaft 2 in the transmission system collides with the buffer ⑤, and the collision force is transmitted along the transmission shaft 2, the buffer housing 202, the insulating pull rod 7, and the moving contact 8. When the collision force is greater than the driving force, the movement stops and there is a tendency to rebound. At the same time, the buffer counterweight assembly 203 continues to move downward in its original movement direction due to inertia;

[0182] As ​As shown, the drive shaft 2, buffer housing 202, insulating pull rod 7, and moving contact 8 in the drive system are temporarily stopped under the action of the collision reaction force between the drive shaft 2 and the buffer 5. At the same time, the buffer counterweight assembly 203 continues to move downward under inertia and collides with the other end of the buffer housing 202 for the second time. The collision force generated by the collision weakens or cancels the collision reaction force between the drive shaft 2 and the buffer 5, thereby weakening or canceling the rebound of the drive system.

[0183] As ​ shown, under the continuous opening driving force of the switchgear drive mechanism 401, the drive shaft 2, buffer housing 202, insulating pull rod 7, and moving contact 8 in the drive system continue to complete the opening action, finally stop moving and stay in the fully opened position, and the opening action is completed.

[0184] That is to say, the present solution provides a buffer device for suppressing rebound in a switchgear, which can weaken or suppress the rebound that occurs when the switchgear contacts a traditional buffer during the opening process, thereby improving the opening performance of the switchgear.

[0185] This buffer device can also be used in the rotary opening and closing drive part of the switchgear; among them, as ​ shown, the buffer housing 202 can be arranged on the drive shaft 2 of the rotary opening and closing drive part of the switchgear through the connecting component 201, and contacts the buffer 5 of the switchgear when the switchgear is in the opened state.

[0186] For the structure of the rotary opening and closing drive part of the switchgear, reference can be made to ​ , ​ or ​ shown; among them, when the rotary opening and closing drive part stops moving due to a collision during closing, the buffer counterweight assembly 203 continues to move forward (obliquely upward) towards the front of the buffer cavity 204 based on inertia and collides with the front of the buffer cavity 204 for the second time. The collision force (obliquely upward) generated by the collision between the buffer counterweight assembly 203 and the front of the buffer cavity 204 can weaken or cancel the collision reaction force (downward) received by the rotary opening and closing drive part due to the collision; when the rotary opening and closing drive part stops moving due to a collision during opening, the buffer counterweight assembly 203 continues to move backward (obliquely downward) towards the rear of the buffer cavity 204 based on inertia and collides with the rear of the buffer cavity 204 for the second time. The collision force (downward) generated by the collision between the buffer counterweight assembly 203 and the rear of the buffer cavity 204 can weaken or cancel the collision reaction force (upward) received by the buffer housing 202 due to colliding with the buffer 5, thereby being used to suppress the rebound of the rotary switchgear during opening and closing; in addition, for the process of this buffer device suppressing the rebound of the rotary switchgear during opening and closing, the details can be seen in the following description.

[0187] As​ As shown, one end of the connecting block is connected to the outer side wall of the buffer housing 202, and the other end is connected to the transmission shaft 2 of the rotary closing and opening drive part. Among them, as ​ shown, the connecting block can be a cuboid connecting block; the buffer housing 202 can be suspended on one side of the transmission shaft 2 of the rotary closing and opening drive part through the connecting block, so that the buffer housing 202 swings with the rotation of the transmission shaft 2 of the rotary closing and opening drive part. In this way, when the switchgear is in the closing state, the collision force generated by the secondary collision between the buffer counterweight assembly 203 and the front part of the buffer housing 202 can better weaken or offset the collision reaction force received by the rotary closing and opening drive part due to the collision. When the switchgear is in the opening state, the collision force generated by the secondary collision between the buffer counterweight assembly 203 and the rear part of the buffer housing 202 can better weaken or offset the collision reaction force received by the buffer housing 202 due to the collision buffer 5.

[0188] For the rotary closing and opening drive part, the buffer counterweight assembly 203 adopts an integral block-shaped counterweight structure or a multi-piece stacked counterweight structure, which is convenient for the buffer counterweight assembly 203 to collide with the front part or the rear part of the buffer cavity 204 as a whole, so as to generate a large collision force, and then better suppress the rebound of the rotary switchgear during closing and opening. Among them, the buffer housing 202 can be a closed structure and can adopt a detachable open cover structure form, which is convenient for loading the buffer counterweight assembly 203.

[0189] In addition, if this buffer device is arranged on the rotary closing and opening drive part of the switchgear, as ​ shown, the shape of the buffer housing 202 can preferably be a drum shape.

[0190] In addition, as described above, this buffer device can also be arranged in the rotary drive system (i.e., the rotary closing and opening drive part) of the switchgear; among them, this buffer device is connected to the rotary drive system through the connecting component 201.

[0191] 1) Closing process of the rotary drive system:

[0192] As ​ shown, the switchgear starts to close from the opening state; among them, the buffer housing 202 of the buffer device is connected to the transmission shaft 2 of the rotary drive system of the switchgear through the connecting component 201, so as to be connected to the rotary drive system of the switchgear.

[0193] As ​As shown, the driving mechanism is installed inside the support frame 1. The driving transmission shaft 2 drives the transmission crank arm 3, the first connecting rod 4, and the second connecting rod 6 in the four-bar linkage transmission system to rotate, driving the insulating pull rod 7 and the moving contact 8, so that the moving contact 8 moves towards the static contact 9. After the buffer housing 202 is separated from the buffer 5 in the transmission system, the switchgear presents an intermediate closing state, and the buffer weight assembly 203 is driven by the buffer housing 202 to move synchronously;

[0194] As ​ shown, the moving contact 8 collides with the static contact 9, the moving contact 8 stops moving, restricting the movement of the transmission shaft 2, and also causing the transmission crank arm 3, the first connecting rod 4, the second connecting rod 6, the insulating pull rod 7, and the buffer housing 202 in the four-bar linkage transmission system to stop moving; at the same time, the buffer weight assembly 203 continues to move upward in the original movement direction under the action of inertia. At the same time, the collision reaction force of the collision between the moving contact 8 and the static contact 9 is transmitted along the moving contact 8, the insulating pull rod 7, the second connecting rod 6, the first connecting rod 4, the transmission crank arm 3, and the transmission shaft 2;

[0195] As ​ shown, the collision reaction force of the moving and static contacts is transmitted. At the same time, the buffer weight assembly 203 continues to move forward under the action of inertia and moves towards and collides with the front part of the buffer housing 202;

[0196] As ​ shown, the buffer housing 202 has a tendency to move backward or has started to move backward under the action of the collision reaction force of the moving and static contacts, that is, it may rebound or has already started to rebound. At this time, the buffer weight assembly 203 moves upward under the action of inertia and collides with the front part of the buffer housing 202 for the second time. The collision force generated by the collision weakens or cancels the collision reaction force of the moving and static contacts, thereby weakening or canceling the rebound of the moving contact 8;

[0197] As ​ shown, after the buffer weight assembly 203 collides with the buffer housing 202, under the action of the collision force between the two and the self-gravity of the buffer weight assembly 203, it falls back to the lower part of the buffer housing 202, and the transmission system drives the transmission shaft 2, the transmission crank arm 3, the first connecting rod 4, the second connecting rod 6, the insulating pull rod 7, and the moving contact 8 to maintain the original state;

[0198] As ​ shown, the transmission shaft 2, the transmission crank arm 3, the first connecting rod 4, the second connecting rod 6, the insulating pull rod 7, the moving contact 8, and the buffer housing 202 of the transmission system stop moving and remain in the closed-in place under the closing holding force of the switchgear driving mechanism 401. The buffer weight assembly 203 returns to the initial position of the buffer housing 202, and the closing operation is completed.

[0199] 2) Opening process of the rotary transmission system:

[0200] As​ As shown, the switchgear starts to trip from the closed state. At this time, the buffer counterweight assembly 203 remains in the position after the previous closing, that is, the buffer counterweight assembly 203 is at the bottom of the buffer housing 202. Under the driving force of the driving mechanism, the moving contact 8 moves away from the static contact 9.

[0201] As ​ As shown, after the driving moving contact 8 is separated from the static contact 9, the switchgear presents an intermediate closing state. During this process, the transmission shaft 2, transmission crank arm 3, first connecting rod 4, second connecting rod 6 in the transmission system drive the insulating pull rod 7 and the buffer housing 202 to move synchronously. The buffer counterweight assembly 203 remains in its original position due to inertia and gradually approaches the other end of the buffer housing 202.

[0202] As ​ As shown, the transmission shaft 2, transmission crank arm 3, first connecting rod 4, second connecting rod 6 in the transmission system drive the insulating pull rod 7 and the buffer housing 202 of the buffer device to perform a tripping action synchronously and move towards the tripped position.

[0203] As ​ As shown, the buffer housing 202 in the transmission system collides with the buffer 5. The collision force is transmitted along the connecting assembly 201, transmission shaft 2, transmission crank arm 3, first connecting rod 4, second connecting rod 6, insulating pull rod 7, and moving contact 8. When the collision force is greater than the driving force, the movement stops and rebounds occur. At the same time, the buffer counterweight assembly 203 continues to move downward under the action of inertia, maintaining its original movement direction.

[0204] As ​ As shown, the transmission shaft 2, transmission crank arm 3, first connecting rod 4, second connecting rod 6, insulating pull rod 7, and moving contact 8 in the transmission system temporarily stop moving under the action of the collision reaction force between the buffer housing 202 and the buffer 5. At the same time, the buffer counterweight assembly 203 continues to move downward under the action of inertia and collides with the other end of the buffer housing 202 for the second time. The collision force generated by the collision weakens or cancels the collision reaction force between the buffer housing 202 and the buffer 5, thereby weakening or canceling the rebound of the transmission system.

[0205] As ​ As shown, the transmission shaft 2, transmission crank arm 3, first connecting rod 4, second connecting rod 6, insulating pull rod 7, and moving contact 8 in the transmission system continue to complete the tripping action under the continuous tripping driving force of the switchgear driving mechanism 401, and finally stop moving and remain in the tripped position, and the tripping action is completed.

[0206] That is to say, a buffer device with a bounce suppression function for a switching device provided by the present invention is composed of a buffer cavity (i.e., the buffer housing 202), a buffer counterweight (i.e., the buffer counterweight assembly 203), and a connecting member (i.e., the connecting assembly 201); the space inside the buffer cavity is larger than the volume of the buffer counterweight, the buffer counterweight moves freely within the buffer cavity, and the connecting member connects the buffer device with a bounce suppression function for a switching device to other moving parts of the switching device.

[0207] A buffer device with a bounce suppression function for a switching device provided by the present invention utilizes the secondary collision formed by the inertial action of the buffer counterweight to weaken or offset the closing bounce force or opening bounce force of the switching device, thereby weakening or offsetting the closing bounce or opening bounce of the switching device.

[0208] In addition, it should also be noted that the time for the buffer counterweight assembly 203 to move from one end to the other end within the buffer housing 202 is affected by the inertia magnitude given by the buffer housing 202 to the buffer counterweight assembly 203 and the size of the internal space of the buffer housing 202. This provides conditions for this solution to be applicable to different switching devices, that is, different switching devices can adjust the time for suppressing or eliminating the bounce of the switching device by designing the length of the buffer housing 202.

[0209] The form of the buffer counterweight assembly 203 can be selected from the overall form, the multi-piece stacking form, and the multi-particle stacking form according to the functional requirements. The selection basis is the required action time for suppressing the bounce of the switching device, and the form and mass size of the buffer counterweight assembly 203 can be obtained through experimental testing or simulation analysis.

[0210] When setting this solution in the transmission system of the switching device through the connecting assembly 201, the setting position can be determined by testing or simulation to be the position where the maximum function can be exerted.

[0211] In addition, the embodiment of the present invention also provides a switching device including the buffer device as described above. Since this solution adopts the above buffer device, it thus has corresponding beneficial effects, which can be specifically referred to the previous description and will not be elaborated here. Of course, the buffer device provided by this solution can also be applied to other devices that need to suppress collision bounce.

[0212] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0213] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A secondary collision buffer device based on inertial drive, which is used to suppress the rebound of switchgear during closing and opening, is characterized in that Comprising: A buffer housing (202), a connection assembly (201), and a buffer counterweight assembly (203); The buffer housing (202) is disposed on the closing and opening drive part of the switchgear through the connection assembly (201), and has a buffer cavity (204) therein; The buffer counterweight assembly (203) is disposed in the buffer cavity (204) of the buffer housing (202), and can move freely in the buffer cavity (204) and collide with the buffer cavity (202); Wherein, the buffer housing (202) and the buffer counterweight assembly (203) can move synchronously with the closing and opening drive part of the switchgear. When the closing and opening drive part stops moving due to a collision during closing or opening, the buffer housing (202) can stop moving synchronously, and the buffer counterweight assembly (203) can continue to move based on inertia and collide with the buffer cavity (204) for a second time, and the generated collision force can weaken or offset the collision reaction force received by the closing and opening drive part due to the collision.

2. The secondary collision buffer device based on inertial drive according to claim 1, characterized in that The moving direction of the buffer counterweight assembly (203) is the same as the moving direction of the closing and opening drive part; Wherein, when the closing and opening drive part stops moving due to a collision during closing or opening, the collision force generated by the buffer counterweight assembly (203) continuing to move based on inertia and colliding with the buffer cavity (204) for a second time is opposite to the collision reaction force received by the closing and opening drive part due to the collision.

3. The secondary collision buffer device based on inertial drive according to claim 1, wherein, The buffer housing (202) is connected to the middle part of the closing and opening drive part through the connection assembly (201); Or, the buffer housing (202) is connected to the end of the closing and opening drive part through the connection assembly (201), and contacts the buffer (5) of the switchgear when the switchgear is in the open state.

4. The secondary collision buffer device based on inertial drive according to claim 3, characterized in that The buffer housing (202) is connected between the first component and the second component of the closing and opening drive part through the connection assembly (201); Or, the buffer housing (202) is connected to the first component of the closing and opening drive part through the connection assembly (201), and contacts the buffer (5) of the switchgear when the switchgear is in the open state; wherein, the first component is close to the buffer (5).

5. The secondary collision buffer device based on inertial drive according to claim 4, characterized in that, The buffer housing (202) is connected between the first component and the second component of the closing and opening drive part through the connection assembly (201); The connection assembly (201) includes: a first connection assembly and a second connection assembly; One end of the first connection assembly is connected to one end of the first component, and the other end is connected to one end of the buffer housing (202); One end of the second connection assembly is connected to the other end of the buffer housing (202), and the other end is connected to one end of the second component.

6. The secondary collision buffer device based on inertial drive according to claim 5, characterized in that, The first connection assembly and / or the second connection assembly includes a connecting rod.

7. The secondary collision buffer device based on inertial drive according to claim 4, wherein The buffer housing (202) is connected to the first component of the closing and opening drive part through the connection assembly (201); One end of the connection component (201) is connected to the buffer housing (202), and the other end is connected to the first component.

8. The secondary collision buffer device based on inertial drive according to claim 7, characterized in that The connection component (201) includes a connecting rod or a connecting block.

9. The secondary collision buffer device based on inertial drive according to claim 1, characterized in that, The shape of the buffer housing (202) includes, but is not limited to, a cylindrical shape, a rectangular shape, or a drum shape.

10. The secondary collision buffer device based on inertial drive according to claim 1, wherein The buffer weight component (203) includes, but is not limited to, an integral block-shaped weight structure, a multi-piece superimposed weight structure, a multi-strip superimposed weight structure, or a multi-grain superimposed weight structure.

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