Switch with at least two poles

Abstract

The invention provides a switch with at least two poles, which at least comprises an insulating shell and elements arranged inside the insulating shell, and the internal elements at least comprise a moving contact device, a static contact device, an operating mechanism and an electromagnet mechanism; and a linkage device is arranged between the moving contact device and the electromagnet mechanism. The electromagnet mechanism can apply pressure to the short-arm moving contact of the moving contact device more quickly, the short resistance of the switch is improved, the installation and application requirements of an energy storage system PCS cabinet are met, and the PV2 requirement of a photovoltaic electric appliance is met at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-voltage electrical apparatus, in particular to a switch with at least two poles. BACKGROUND

[0002] In recent years, with the increasing policy support of China's energy storage industry and the iterative update of battery technology, energy storage plays a crucial role in the power system, which can balance supply and demand, improve the flexibility and reliability of the power system. Energy storage systems have increasingly high short-circuit performance requirements for electrical protection equipment, and in many cases electrical equipment must meet both high-voltage arc breaking and high short-circuit performance.

[0003] In order to improve the short-circuit resistance of low-voltage electrical apparatus, the conventional and common way is to increase the final pressure between the moving contact and the static contact to resist the repulsive force of the short-circuit current and the magnetic force, to ensure the reliable connection of the moving contact and the static contact under short-circuit conditions. The commonly used technical solution is to increase the force value of the operating mechanism spring and the contact spring to form a large contact final pressure. Obviously, this method requires more stringent process and material requirements, increases production costs, and the contact final pressure still exists when there is no short-circuit current in the circuit. The force value of the operating mechanism spring and the contact spring is large, which will generate a large impact stress, causing great wear and tear to the contact and the operating mechanism, affecting the service life of the electrical components.

[0004] The battery / battery cluster charging and discharging short-circuit current time constant in the energy storage industry is very small, usually 1-3ms, that is, the short-circuit current rises rapidly and quickly reaches the peak value. The electrodynamic repulsion of the moving contact and the static contact will quickly exceed the tension of the moving contact spring, so the moving contact contact piece will be quickly repelled. Because the gap between the armature and the magnetic yoke of the conventional electromagnetic mechanism pressure component is relatively large in the initial state, the armature pressure component is relatively small under the short-circuit current magnetic field suction force, and there is also a distance of the air gap, so the movement of the armature component of the electromagnetic mechanism to the moving contact contact piece will take a relatively long time to exert pressure on the moving contact contact piece. At this time, the contact piece of the moving contact may have been quickly repelled, so the existing electromagnetic mechanism armature component is difficult to quickly act to exert an additional pressure on the moving contact contact piece to overcome the electrodynamic repulsion of the moving and static contacts, thus affecting the effect of the armature magnetic enhancement pressure on improving the short-time resistance performance.

[0005] In addition, the photovoltaic industry usually requires that the electrical components meet the PV2 use category, and in many cases, the high voltage rated switch is required to be closed and opened with electricity. The arc generated by the switch with electricity will be separated and connected to the circuit. The main function of the disconnector is to separate and connect the circuit, which usually does not have high voltage arc extinguishing capability. In the case where arc extinguishing capability is required, other devices such as circuit breakers are usually used in cooperation, which not only increases the cost of electrical equipment, but also complicates the circuit and power distribution system. Therefore, the disconnector with high voltage and short time arc extinguishing capability has become a bottleneck that must be broken through in the low voltage industry.

[0006] In addition, the compactness of the installation space of the electrical product, the temperature rise capacity of the carrying current, and the cost performance of the product of the PCS cabinet in the energy storage industry are increasingly demanding.

[0007] In summary, it is an urgent need to provide a low-cost, small-size, high-voltage, and high short-time performance switch solution to break through the technical bottleneck of the industry. SUMMARY

[0008] Based on the above background, the present application provides a switch with at least two poles to improve the short-time performance index of the electrical switch in a low-cost and high-performance manner without affecting the mechanical life of the product, effectively solving the above technical problems.

[0009] The present application discloses a switch with at least two poles, which comprises an insulating shell and internal components, the internal components at least including: a moving contact device, a stationary contact device, an operating mechanism, and an electromagnet mechanism; a linkage device is arranged between the moving contact device and the electromagnet mechanism.

[0010] In this way, by arranging the linkage device between the electromagnet mechanism and the moving contact device, when the operating mechanism drives the moving contact device to move, the moving contact device drives the linkage device, and in turn drives the armature in the electromagnet mechanism to move. When a short-circuit current is encountered in the loop, the armature can quickly act, and the pressure on the moving contact is applied before the short-circuit current reaches the peak value, which can more reliably avoid the risk of the electrodynamic repulsive force generated by the moving and stationary contacts when the short-circuit current flows through the moving contact repelling the moving contact, and quickly improves the short-time resistance of the loop.

[0011] In some embodiments, the operating mechanism drives part or all of the moving contact device to move up and down with the stationary contact device to make or break the electrical connection; part or all of the moving contact device drives part of the electromagnet mechanism to move downward or up and down.

[0012] In the above embodiments, the partial or complete moving contact device drives the armature to rotate downward or move up and down, and when a short-circuit current occurs in the circuit, the electromagnet mechanism generates a magnetic attraction force under the action of a strong magnetic field, increases the pressure applied by the moving contact device to the static contact device, and improves the short-time withstand performance effect.

[0013] In some embodiments, the moving contact device is composed of a long moving contact and a short moving contact.

[0014] In the above embodiments, the moving contacts in the moving contact device are divided into long moving contacts and short moving contacts, each of which realizes its electrical function: the short moving contact is paired with the electromagnet structure to bear the function of improving the short-time withstand capability of the circuit, and the long moving contact is arranged with the arc extinguishing device to realize the function of high-voltage breaking and arc extinguishing.

[0015] In some embodiments, a linkage device is arranged between the short moving contact and the electromagnet mechanism.

[0016] In the above embodiments, a linkage device is arranged between the armature in the electromagnet mechanism and the moving contact device. When the operating mechanism drives the moving contact device to move, the moving contact device drives the linkage device, which in turn drives the armature in the electromagnet mechanism to move downward or up and down. When the closing is completed, the armature is close to or next to the moving contact finger above. When a short-circuit current occurs in the circuit, the armature can quickly act to exert pressure on the moving contact before the short-circuit current reaches the peak value, thereby more reliably avoiding the risk of the moving and static contacts being repelled by the electrodynamic repulsive force generated when the short-circuit current flows, and quickly improving the short-time withstand capability of the circuit.

[0017] In some embodiments, part of the electromagnet mechanism is arranged above the short moving contact when a short-circuit large current occurs in the circuit in the on state of the switch.

[0018] In the above embodiments, during the closing of the switch, the short moving contact rotates under the drive of the operating mechanism, which in turn drives the linkage device. The linkage device is connected to the armature assembly in the electromagnet mechanism and drives the armature assembly to move. When the switch is in the on state, the armature assembly is partially above the short moving contact.

[0019] In some embodiments, the electromagnet mechanism is sleeved on the static contact device and arranged at the front end of the short moving contact.

[0020] In the above embodiments, since the short moving contact mainly bears the risk of the contacts being repelled due to the electrodynamic repulsive force and the HOM force generated by the moving and static contacts when a short-circuit large current occurs in the circuit, the electromagnet mechanism needs to be sleeved and fixed on the static contact device and arranged at the front end of the short moving contact. In this way, the magnetic attraction force generated by the electromagnet mechanism can exert pressure on the short moving contact when a short-circuit large current occurs in the circuit, thereby enhancing the short-time withstand capability.

[0021] In some embodiments, the electromagnet mechanism is composed of at least a magnetic yoke and a moving armature arranged above the magnetic yoke to form a closed magnetic circuit with the magnetic yoke.

[0022] In the above embodiments, the electromagnet mechanism is composed of a moving armature and a magnetic yoke to form a closed magnetic circuit, which can enclose the magnetic lines generated by the coil inside, so that the magnetic energy is fully utilized, and the efficiency of the electromagnet is maximized. Therefore, when a short-circuit current occurs in the circuit, the magnetic attraction generated is greater, and the pressure on the contact is more significant.

[0023] In some embodiments, when a short-circuit large current occurs in the circuit in the on state of the switch, the moving armature is located above the short-moving contact, and the electromagnetic force generated by the moving armature applies pressure to the static contact device through the short-moving contact.

[0024] In the above embodiments, when the switch is in the on state, only the moving armature is located above the short-moving contact, next to or close to the short-moving contact. When a short-circuit large current occurs in the circuit, the magnetic attraction generated by the electromagnet mechanism forces the moving armature to act, which can more quickly apply pressure to the static contact device to overcome the electric repulsion and HOM force between the contacts and avoid the circuit from being disconnected.

[0025] In some embodiments, the short-moving contact is provided with an insulating head cover, and the insulating head cover is always located between the linkage devices during the movement of the linkage devices driven by the moving armature.

[0026] In the above embodiments, the linkage device is composed of at least two metal pressure plates connected to the moving armature, at least one of which is a long plate extending along the length direction of the moving armature and attached to the lower surface of the moving armature, and at least one of which is a curved long plate attached to the lower end of the pressure plate connected to the moving armature. When the operating mechanism drives the moving contact device to move in the closing direction, the insulating head cover on the moving contact in the moving contact device touches and drives the curved long plate to move during the movement of the insulating head cover, thereby driving the moving armature assembly to move in the closing direction. The insulating head cover is always located between the moving armature assembly and the linkage device during the entire linkage process, which ensures the electrical gap between the moving contact and the electromagnet mechanism.

[0027] In some embodiments, the linkage device includes at least two connecting rods, at least one end of at least one connecting rod is directly or indirectly connected to the moving contact device, and at least one end of at least one connecting rod is directly or indirectly connected to the moving armature. The up-down movement of the moving contact device drives the at least two connecting rods to drive the moving armature to move up and down.

[0028] In the above embodiment, the linkage device is composed of at least two connecting rods, i.e. a first connecting rod and a second connecting rod, which are movably connected at one end and can rotate flexibly at the connection, wherein one end of the first connecting rod is connected with the movable contact in the movable contact device, and one end of the second connecting rod is connected with the armature assembly. When the operating mechanism is in the opening and closing movement, the movable contact drives the connected first connecting rod to move, and the first connecting rod drives the second connecting rod to move, thereby driving the armature assembly to move.

[0029] In some embodiments, the contact closing contact surface of the movable contact device and the stationary contact device is arranged horizontally relative to the length direction of the switch or is inclined towards the rotation center direction of the movable contact device.

[0030] In the above embodiment, the movable contact and the stationary contact in the movable contact device and the stationary contact device are arranged in pairs, and the contact surface of the movable contact and the stationary contact is arranged horizontally relative to the length direction of the switch or is inclined towards the rotation center direction of the movable contact device. The inclined arrangement of the contact surface of the movable contact and the stationary contact can reduce the repulsion force arm formed between the rotation center of the contact and the contact surface. The smaller the repulsion force arm is in the closed state, the greater the pressure of the movable contact on the stationary contact is. When a short-circuit current occurs in the circuit, the electrodynamic repulsion force generated by the movable contact and the stationary contact is more difficult to repel the movable contact, and the short-time withstand capability is relatively enhanced.

[0031] In some embodiments, the electromagnetic mechanism is provided beside the arc extinguishing device.

[0032] In the above embodiment, the electromagnetic mechanism and the arc extinguishing device bear different functions and are provided beside each other.

[0033] In some embodiments, the long movable contact is arranged in pairs with the arc extinguishing device, and the arc extinguishing device is arranged in front of the long movable contact.

[0034] In the above embodiment, the long movable contact is arranged in pairs with the arc extinguishing device to realize the function of extinguishing arc in high-voltage breaking. The arc is initiated at the long movable contact, and the long movable contact is arranged as a long arm to facilitate the elongation of the arc and the increase of arc voltage to extinguish the arc. The arc extinguishing device arranged in front allows the arc to enter the arc extinguishing chamber more quickly to be extinguished.

[0035] In some embodiments, the short movable contact is arranged in pairs with the electromagnetic mechanism, and the electromagnetic mechanism is arranged in front of the short movable contact.

[0036] In the above embodiment, the short movable contact drives the armature assembly to move under the action of the linkage device. When the switch is in the on state of the circuit, the armature in the electromagnetic mechanism is close to or next to the upper part of the short movable contact finger, which shortens the distance between the armature assembly and the movable contact. When a short-circuit current occurs in the circuit, the armature can act more quickly to exert pressure on the short movable contact, thereby improving the short-time withstand capability.

[0037] In some embodiments, in any one pole of the switch, the fixed contact device comprises a first fixed contact close to the operating mechanism and a second fixed contact away from the operating mechanism, the first fixed contact is arranged lower than the second fixed contact.

[0038] In the above embodiments, the same polarity or same phase fixed contact is arranged with the first fixed contact and the second fixed contact of different structural features, and the different fixed and movable contact combinations are arranged differently to achieve respective electrical functions.

[0039] In some embodiments, the movable contact above the first fixed contact is a short movable contact, and the movable contact above the second fixed contact is a long movable contact.

[0040] In the above embodiments, the first fixed contact is arranged lower than the second fixed contact, and the movable contact above the second fixed contact is longer than the movable contact above the first fixed contact. The first fixed contact and the short movable contact realize the function of high short resistance, and the second fixed contact and the long movable contact realize the function of high voltage breaking.

[0041] In some embodiments, when the switch is closed, the long movable contact contacts the second fixed contact earlier than the short movable contact contacts the fixed contact device.

[0042] In the above embodiments, the long movable contact and the short movable contact are arranged differently at the contact support limit, the limit surface of the long movable contact at the contact support is arranged lower than that of the short movable contact, and the second fixed contact is higher than the first fixed contact. Therefore, the closing contact of the long movable contact and the second fixed contact is earlier than that of the short movable contact and the first fixed contact, and the overtravel of the long movable contact and the second fixed contact is greater than that of the short movable contact and the first fixed contact. The large overtravel is arranged to avoid the risk of poor or no conduction of the circuit caused by arc burning between the long movable contact and the second fixed contact during breaking.

[0043] In some embodiments, when the switch is opened, the long movable contact separates from the second fixed contact later than the short movable contact separates from the fixed contact device.

[0044] In the above embodiments, when the switch is opened, the short movable contact separates from the first fixed contact first, at which time the long movable contact still contacts the second fixed contact, and the circuit is still in a conductive state. Therefore, no arc is generated between the short movable contact and the first fixed contact. Subsequently, the long movable contact separates from the second fixed contact, an arc is generated between the long movable contact and the second fixed contact, enters the arc extinguishing chamber, and completes arc extinguishing.

[0045] In some embodiments, the arc extinguishing device is a structure of metal grid spacers stacked in layers.

[0046] In the above embodiments, the arc extinguishing chamber with a narrow gap and multiple grid spacers stacked in layers can more effectively extinguish the arc after the arc is pulled into the multiple grid spacers in the arc extinguishing chamber.

[0047] In some embodiments, the number of layers or sheets of the metal grid spacing layer is at least 50 layers or sheets.

[0048] In the above embodiments, since the principle condition for arc extinguishing is that the total pressure drop of the arc is greater than the power supply voltage, in the case where the electric field strength of the arc and the length of the arc are unchanged, increasing the near-pole pressure drop can increase the total pressure drop of the arc; the arc is cut by the arc-extinguishing grid, and each short arc segment will have a near-pole pressure drop, so the more the arc is divided into segments, the higher the near-pole pressure drop, which is more conducive to extinguishing the arc; under high-voltage conditions, increasing the number of grid plates in the arc-extinguishing chamber can divide the high-voltage arc into more segments, which is more conducive to extinguishing the arc; under normal atmospheric pressure, taking the near-pole pressure drop of the iron grid as an example, which is 20-25 V, at least 50 grid plates are provided in an arc-extinguishing chamber, and two arc-extinguishing chambers are connected in series to form a 2-pole switch, so that the near-pole pressure drop of the arc can reach 2000-2500 V, which greatly improves the reliability of extinguishing high-voltage arcs.

[0049] The beneficial effects of the present application are:

[0050] 1. The movable contact is connected with the electromagnet mechanism, and the movable contact drives the armature of the electromagnet mechanism to move during the closing process of the movable contact. In the closed state of the movable contact, the armature is close to or abuts against the contact sheet of the movable contact. In the case of short-circuit current in the loop, the magnetic attraction force generated by the electromagnet mechanism can make the armature press the contact finger of the movable contact more quickly, and the movable contact and the static contact can be more reliably avoided from being repelled due to the electric repulsion and the Halm force repulsion caused by the short-circuit current, thereby improving the short-time withstand performance.

[0051] 2. The movable contact device is provided with a main contact and an arc contact, and the arc contact is set to be closed first and opened later than the main contact, so that the arc contact of the switch is charged and opened with a large opening distance of the multi-grid, thereby improving the arc extinguishing performance under high voltage. The main contact is matched with a linkage type or pre-pressing type armature pressing structure, thereby improving the short-time withstand performance under a very small time constant. In summary, the new switch meets the requirements of high short-time withstand performance and the performance requirements of the PV2 use category under high voltage.

[0052] 3. The structure is compact and small in size, and the volume is smaller and the cost is lower than that of the universal circuit breaker with the same current capacity. Compared with the molded case circuit breaker or disconnector with the same current capacity, the short-time withstand performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0054] Figure 1 A structure schematic diagram of the at least two-pole switch in the open state according to the embodiment;

[0055] Figure 2 A sectional view of the at least two-pole switch in the closed state according to the embodiment;

[0056] Figure 3 A structure schematic diagram of the electromagnet mechanism of the at least two-pole switch according to the embodiment;

[0057] Figure 4 A structure schematic diagram of the insulating shell of the at least two-pole switch according to the embodiment;

[0058] Figure 5 A structure schematic diagram of the at least two-pole switch according to the embodiment;

[0059] Figure 6 A structure schematic diagram of the arc extinguishing device of the at least two-pole short-time high-resistance current switch according to the embodiment;

[0060] Figure 7 A structure schematic diagram of the at least two-pole short-time high-resistance current switch in the closed state according to another embodiment of the application;

[0061] Figure 8 A structure schematic diagram of the at least two-pole short-time high-resistance current switch in the open state according to the embodiment shown in Figure 7

[0062] A structure schematic diagram of the at least two-pole short-time high-resistance current switch according to the embodiment shown in Figure 9 Figure 7 A structure schematic diagram of the at least two-pole short-time high-resistance current switch according to the embodiment shown in DETAILED DESCRIPTION

[0063] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described below in a more detailed manner with reference to the drawings accompanying the embodiments of the present application. Identical or similar labels in the drawings represent identical or similar elements or elements with identical or similar functions. The described embodiments are part of the embodiments of the present application, but not all the embodiments of the present application.

[0064] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, but cannot be understood as a limitation of the present application. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0065] ​The embodiments of the present application will be described in detail below with reference to the drawings.

[0066] Please refer to Figure 1 and Figure 2 The embodiment discloses a switch with at least two poles, which comprises an insulating shell and internal components arranged in the shell, and the internal components comprise a moving contact device 1, a stationary contact device 2, an arc extinguishing device 3, an operating mechanism 4, and an electromagnet mechanism 5. The moving contact device 1 comprises a long moving contact 13 and a short moving contact 12, which are arranged along the width direction of the switch. One end of the long moving contact 13 and the short moving contact 12 is rotatably connected to the operating mechanism 4, and the other end of the long moving contact 13 and the short moving contact 12 is provided with a moving contact point. The short moving contact 13 is further provided with an arc separation cover 131 on the side away from the moving contact point, and an insulating head cover 132 is arranged on the other end of the short moving contact 13. The arc separation cover 131 and the insulating head cover 132 are made of insulating material.

[0067] The stationary contact device 2 comprises a coupling plate 23 and stationary contact points arranged on the coupling plate. The stationary contact points comprise a first stationary contact point 21 and a second stationary contact point 22 arranged in front of and behind the operating mechanism 4. The first stationary contact point 21 is arranged close to the operating mechanism 4, and the second stationary contact point 22 is arranged away from the operating mechanism 4. The height of the first stationary contact point 21 is lower than that of the second stationary contact point 22. The short moving contact 12 is arranged above the first stationary contact point 21 and corresponds to the first stationary contact point 21, and the long moving contact 13 is arranged above the second stationary contact point 22 and corresponds to the second stationary contact point 22.

[0068] The short moving contact 12 is a main contact, and the long moving contact 13 is an arc contact. The length of the long moving contact 13 is greater than that of the short moving contact 12, so that when the switch is closed, the long moving contact 13 contacts the second stationary contact point 22 earlier than the short moving contact 12 contacts the first stationary contact point 21. When the switch is opened, the long moving contact 13 is disconnected from the second stationary contact point 22 later than the short moving contact 12 is disconnected from the first stationary contact point 21. The arc extinguishing device 3 is arranged in front of the long moving contact 13 and is used to extinguish the arc generated between the long moving contact 13 and the second stationary contact point 22. In this way, when the switch is opened, the short moving contact 12 is disconnected from the first stationary contact point 21 first, and at this time, the long moving contact 13 is still in contact with the second stationary contact point 22, and the circuit is still in a conducting state. Therefore, no arc is generated between the short moving contact 12 and the first stationary contact point 21. With the opening operation, the long moving contact 13 is disconnected from the second stationary contact point 22, the arc is generated between the long moving contact 13 and the second stationary contact point 22, and then enters the arc extinguishing device 3 to complete arc extinguishing.

[0069] The distance between the long movable contact 13 and the second stationary contact 22 is larger than the distance between the short movable contact 12 and the first stationary contact 21. The large distance between the long movable contact 13 and the second stationary contact 22 is conducive to arc.

[0070] The electromagnet mechanism 5 is sleeved on part or all of the stationary contact device 1 and arranged at the front end of part or all of the movable contact device 1. In this embodiment, the electromagnet mechanism 5 is sleeved on part of the stationary contact device 1, specifically, please refer to Figure 1 and Figure 3 The electromagnet mechanism 5 includes a fixed support 54 fixed on the connecting plate 23, an armature 51 rotationally connected to the fixed support 54 through a rotating shaft 53, and a magnetic yoke 52 fixedly sleeved on the connecting plate 23. The magnetic yoke 52 is U-shaped and wraps the connecting plate 23 and the first stationary contact 21. The armature 51 is arranged at the front end of the short movable contact 12. The magnetic yoke 52 and the armature 51 are formed by at least one magnetic conductive sheet. The magnetic yoke and the armature formed by multiple magnetic conductive sheets are conducive to increasing the magnetic field strength. The armature 51 rotates under the action of the magnetic field and cooperates with the magnetic yoke 52 to form a rotating clapping action. The operating mechanism 4 drives the movable contact device 1 and the electromagnet mechanism 5 to move. Part of the structure of the armature 51 is located above the short movable contact 12 and is provided with a linkage device 6 between the short movable contact 12 and the movable contact device 1.

[0071] In this embodiment, the magnetic yoke sleeved on the connecting plate is in a fixed state. The armature and the magnetic yoke arranged above the magnetic yoke can form a closed magnetic circuit. The armature can rotate relative to the magnetic yoke. When a short-circuit current appears on the connecting plate passing through the center of the armature and the magnetic yoke, the armature will be attracted to the magnetic yoke under the action of a strong magnetic field, so that the armature applies an external force to the short movable contact, thereby increasing the pressure of the short movable contact and the first stationary contact and preventing the short movable contact and the first stationary contact from being repelled by the electric repulsion and the HOM force under the condition of large current.

[0072] When the short movable contact 12 and the first stationary contact 21 and the long movable contact 13 and the second stationary contact 22 are disconnected, and the short movable contact 12 and the first stationary contact 21 and the long movable contact 13 and the second stationary contact 22 are in contact, and there is no short-circuit current in the loop, the armature 51 and the magnetic yoke 52 are in an open state. When the short movable contact 12 and the first stationary contact 21 and the long movable contact 13 and the second stationary contact 22 are in contact, and a short-circuit current appears in the loop, the armature 51 and the magnetic yoke 52 form a closed magnetic circuit, generate a magnetic attraction force, and the armature 51 rotates relative to the magnetic yoke 52. The armature 51 pressurizes the short movable contact 12.

[0073] The first static contact 21 is arranged horizontally relative to the switch length direction or is inclined towards the dynamic contact device rotation center direction, the first static contact 21 is arranged to reduce the repulsion force arm formed between the dynamic contact rotation center and the first static contact 21 contact surface, the smaller the repulsion force arm in the closed state, the greater the pressure of the short dynamic contact 12 on the first static contact 21, when the short circuit current occurs in the circuit, the electrodynamic repulsion force generated between the short dynamic contact 12 and the first static contact 21 is more difficult to repel the short dynamic contact 12, and the short time withstand capability is relatively enhanced.

[0074] Please continue to refer to Figure 1 、 Figure 2 and Figure 3 , the linkage device 6 includes a first pressing plate 61 and a second pressing plate 62, the first pressing plate 61 and the second pressing plate 62 are connected with the armature 51, specifically, one end of the first pressing plate 61 and the second pressing plate 62 is fixed on one end of the armature, the fixing mode can be riveting or screw connection, the first pressing plate 61 is long plate-shaped and extends along the length direction of the armature 51 and is attached to the lower surface of the armature 51, the second pressing plate 62 is curved long plate-shaped, one end is attached to the lower end of the first pressing plate 61 and is fixed with the first pressing plate 61 and the armature 51, the other end extends along the lower surface of the first pressing plate 61 for a distance and extends downwardly, so that the first pressing plate 61 and the second pressing plate 62 form bifurcated openings on the side close to the short dynamic contact 12, in the closing process of the switch, the operating mechanism 4 drives the short dynamic contact 12 to rotate, the insulating head cover 132 at the front end of the short dynamic contact 12 first contacts the upper surface of the second pressing plate 62, since one end of the first pressing plate 61 and the second pressing plate 62 is fixed on one end of the armature, the insulating head cover 132 drives the entire armature to rotate.

[0075] The dynamic contact device 1 contacts the second pressing plate 62 at a certain position in the closing movement process, then drives the second pressing plate 62 and the armature 51 to rotate together, when the dynamic contact device 1 is completely in contact with the static contact device 2, the first pressing plate 61 presses the upper end of the dynamic contact, therefore the dynamic contact is subjected to additional pressure provided by the first pressing plate 61 when the circuit is normally conducted. When the short circuit current occurs in the circuit, the magnetic attraction force generated by the closed magnetic circuit formed by the armature 51 and the magnetic yoke 52 can more quickly and rapidly beat the short dynamic contact 12, and again apply pressure to improve the short time withstand capability.

[0076] The second stationary contact 22 is arranged on one side of the stationary contact device 2, and the opening and closing of the long movable contact 13 and the arc extinguishing device 3 are arranged on one side of the stationary contact device 2, so that the distance between the arc extinguishing devices between phases is maximized, and the risk of phase-to-phase arc short circuit is prevented. The short movable contact 12 and the first stationary contact 21 do not generate arc, so the arc extinguishing device does not need to be arranged in front of the short movable contact 12. The arc is generated from the long movable contact 13, so the arc extinguishing device is arranged in front of the long movable contact 13.

[0077] In other embodiments, the second stationary contact 22 can also be arranged in the middle of the stationary contact device 2, and the arrangement position of the second stationary contact 22 can be adjusted according to different requirements of the switch.

[0078] Please refer to Figure 4 and Figure 5 , the insulating shell at least includes a base 7 and a cover 8, the base 7 and the cover 8 are buckled to form a space for accommodating the movable contact device 1, the stationary contact device 2, the arc extinguishing device 3, the operating mechanism 4 and the electromagnet mechanism 5, the cover 8 above the stationary contact device 2 is sunken, and the electric device 9 is arranged in the sunken area, the electric device 9 drives the operating mechanism 4 to operate the opening and closing work, and then drives the movable contact device 1 to act to connect and disconnect electricity. The cover 8 of the present application is arranged to accommodate the sunken area of the electric device, so that the electric device 9 only occupies part of the switch body space, greatly improves the space utilization rate of the switch body, and also meets the installation requirements of small volume of cabinet body.

[0079] Please refer to Figure 1 and Figure 6The arc extinguishing device 6 comprises a plurality of arc extinguishing grid pieces 61 stacked, baffle plates 62 at both ends of the arc extinguishing grid pieces, and insulation pieces 63 connected with the baffle plates at both ends. The baffle plates 62 are used to fix both ends of the arc extinguishing grid pieces. The arc extinguishing device 6 is formed into a hawk mouth type arc extinguishing chamber by stacking a plurality of arc extinguishing grid pieces 61. Since the principle condition for arc extinguishing is that the total pressure drop of the arc is greater than the power supply voltage, in the case that the electric field intensity of the arc and the length of the arc are unchanged, increasing the near-pole pressure drop can increase the total pressure drop of the arc. The arc is cut by the arc extinguishing grid pieces, and each short arc segment will have a near-pole pressure drop. Therefore, the more the arc is divided into segments, the higher the near-pole pressure drop, which is more conducive to extinguishing the arc. Under high voltage conditions, by increasing the number of grid pieces of the arc extinguishing chamber, the high voltage arc is divided into multiple segments, which is more conducive to extinguishing the arc. Under normal atmospheric pressure, taking the near-pole pressure drop of the iron grid piece as an example, which is 20-25V, at least 50 grid pieces are used in an arc extinguishing chamber, and at least 50 layers of grid pieces are formed. The two-pole switch is connected in series with two arc extinguishing chambers, and the near-pole pressure drop of the arc can reach 2000-2500V. In this way, the reliability of extinguishing high voltage arc is greatly improved. During the opening process of the switch, the long moving contact 13 penetrates into the arc extinguishing device 6, which is conducive to quickly extinguishing the arc generated when the long moving contact 13 is separated from the second static contact 22, so as to bear the high voltage arc breaking function, so that the product not only meets the high voltage arc breaking requirement, but also meets the high short time withstand current requirement.

[0080] Please refer to Figure 7 , Figure 8 and Figure 9 , the present application provides another specific embodiment of a two-level short time high withstand current switch. The difference between the above-mentioned embodiment and the present embodiment is that the linkage device is different. The linkage device comprises at least two connecting rods. In the present embodiment, the linkage device 6 comprises a first connecting rod 601 rotatably connected with the front end of the short moving contact 12, a second connecting rod 602 rotatably connected with the first connecting rod 601, and a fixed plate 603 fixed above the armature 51. The other end of the second connecting rod 602 is rotatably connected with the fixed plate 603. The first connecting rod 601 is provided with two and located on both sides of the short moving contact 12. The second connecting rod 602 is provided with two and located on both sides of the upper end of the fixed plate 603. The upper end surface of both sides of the fixed plate 603 is provided with a receiving groove. The second connecting rod 602 is arranged in the receiving groove, and the two side walls of the receiving groove are provided with through holes. The two second connecting rods 602 on both sides are connected by a shaft penetrating through the through holes of the two side walls of the receiving groove.

[0081] The short moving contact 12 is provided with limiting portions 120 on both sides of the end portion for limiting rotation of the first connecting rod 601, the limiting portions 120 are arranged adjacent to the upper rear of the rotation connection between the first connecting rod 601 and the short moving contact 12, when the short moving contact 12 moves to a certain position, the end portion of the first connecting rod 601 abuts against the limiting portion 120, with the short moving contact 12 continuing to move to drive the first connecting rod 601 to move in the direction of the armature 51 and push the second connecting rod 602 to rotate forward, until the second connecting rod 602 or the first connecting rod 601 abuts against the fixed plate 603, at this time, the short moving contact 12 continues to move to drive the first connecting rod 601, the second connecting rod 602 and the fixed plate 603 to move synchronously, since the fixed plate 603 is fixedly connected with the armature 51, the movement of the fixed plate 603 can drive the armature 51 to move, so that the movement of the short moving contact 12 drives the movement of the armature 51.

[0082] The short-time high-resistance-current switch of at least two levels of the application has compact structure arrangement of the moving contact device, the fixed contact device, the arc extinguishing device, the operating mechanism, the electromagnet mechanism and the electric device, realizes small size of the switch, realizes rapid arc extinguishing under high voltage and contact repulsion protection under large short-circuit current through the two sets of contact structure cooperating with the arc extinguishing device and the electromagnet mechanism, meets the high short-time resistance performance requirement of the energy storage industry and the performance requirement of the PV2 use category of the photovoltaic industry.

[0083] The application can be realized in other specific forms without departing from the spirit and essential characteristics thereof. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description above, and all changes which come within the meaning and equivalency range of the claims are intended to be embraced therein.

Claims

1. A switch of at least two poles, said switch comprising at least an insulating housing and elements arranged inside, said internal elements comprising at least: The moving contact device, the static contact device, the operating mechanism, and the electromagnet mechanism are characterized in that a linkage device is arranged between the moving contact device and the electromagnet mechanism.

2. A switch having at least two poles according to claim 1, characterized in that: The operating mechanism drives part or all of the moving contact device to move up and down to connect or disconnect the static contact device; part or all of the moving contact device drives part of the electromagnet mechanism to move downward or up and down.

3. A switch having at least two poles according to claim 1, characterized in that: The moving contact device is composed of a long moving contact and a short moving contact.

4. A switch having at least two poles according to claim 3, characterized in that: A linkage device is arranged between the short moving contact and the electromagnet mechanism.

5. A switch having at least two poles according to claim 3, characterized in that: When a short-circuit large current occurs in the circuit in the on state of the switch, part of the electromagnet mechanism is arranged above the short moving contact.

6. A switch having at least two poles according to claim 3, characterized in that: The electromagnet mechanism is sleeved on the static contact device and arranged at the front end of the short moving contact.

7. A switch having at least two poles according to claim 1, characterized in that: The electromagnet mechanism is composed of at least a magnetic yoke and a moving armature arranged above the magnetic yoke to form a closed magnetic circuit with the magnetic yoke.

8. A switch having at least two poles according to claim 7, characterized in that: When a short-circuit large current occurs in the circuit in the on state of the switch, the armature is located above the short moving contact, and the electromagnetic force generated by the armature is applied to the static contact device through the short moving contact.

9. A switch having at least two poles as claimed in claim 3, characterized in that: An insulating head cover is arranged on the short moving contact, and the insulating head cover is always between the linkage devices during the movement of the linkage device driving the armature.

10. A switch having at least two poles according to claim 7, characterized in that: The linkage device includes at least two connecting rods, the at least two connecting rods are movably connected, at least one end of at least one connecting rod is directly or indirectly connected with the moving contact device, at least one end of at least one connecting rod is directly or indirectly connected with the armature, and the moving contact device (1) moves up and down to drive the at least two connecting rods to move the armature up and down.

11. A switch having at least two poles according to claim 1, characterized in that: The contact closing contact surface of the moving contact device and the static contact device is arranged horizontally relative to the length direction of the switch or inclined towards the rotation center direction of the moving contact device.

12. A switch having at least two poles as defined in claim 1, characterized in that: An arc extinguishing device is arranged beside the electromagnet mechanism.

13. A switch having at least two poles as claimed in claim 3, characterized in that: The long moving contact is arranged in pairs with the arc extinguishing device, and the arc extinguishing device is arranged in front of the long moving contact.

14. A switch having at least two poles according to claim 1 or 2, characterized in that: In any pole of the switch, the static contact device includes a first static contact point close to the operating mechanism and a second static contact point away from the operating mechanism, and the first static contact point is arranged lower than the second static contact point.

15. A switch having at least two poles according to claim 14, characterized in that: The moving contact above the first static contact point is a short moving contact, and the moving contact above the second static contact point is a long moving contact.

16. A switch having at least two poles according to claim 15, characterized in that: When the switch is closed, the long moving contact contacts the second static contact point earlier than the short moving contact contacts the static contact device.

17. A switch having at least two electrodes as claimed in claim 15, wherein: The long moving contact separates from the second static contact point later than the short moving contact separates from the static contact device.

18. A switch having at least two poles according to claim 12 or 13, characterized in that: The arc extinguishing device is a structure of metal grid spacers stacked in layers.

19. A switch having at least two electrodes as claimed in claim 18, wherein: The number of layers of the metal grid spacers stacked in layers is at least 50 layers or pieces.

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