Contact system, load switch and electricity meter

Abstract

The invention provides a contact system, a load switch and an electricity meter, and relates to the technical field of low-voltage electrical appliances, the contact system comprises at least two groups of contact assemblies, each group of contact assembly comprises a moving contact and a static contact which are matched with each other, and the moving contact and the static contact are each provided with at least two contacts. The at least two contacts of the moving contact are in one-to-one correspondence with the at least two contacts of the static contact, so that after parallel circuit connection is formed between the moving contact and the static contact of each group of contact assembly, series circuit connection is formed between the at least two groups of contact assemblies. A mode of first parallel connection and then series connection is adopted, the current of a main loop is shunted through parallel connection, so that the current flows through the moving contact and the static contact in the same direction, the moving contact and the static contact are driven to be further pressed, and the capability of resisting repulsive impact and thermal impact of short-circuit current of the contact assembly is more stable. The short-term endurance capability, the short-term endurance dynamic stability and the short-term endurance thermal stability are improved; the series connection enables the whole loop to form multiple breakpoints, the opening distance is multiplied, and the dielectric property and the arc extinguishing effect can be improved.

Description

Technical Field

[0001] This application relates to the technical field of low-voltage electrical appliances, and in particular, to a contact system, a load switch, and an electric meter. Background Art

[0002] Relays and contactors are both low-voltage switches with load. They are electrical appliances that cause a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirement. It has an interaction relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is usually applied to automated control circuits. It is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] When evaluating low-voltage switches, short-term withstand capacity is one of the evaluation indicators, which refers to the ability of a low-voltage switch to withstand the thermal shock of a short-circuit current within a certain period of time after passing through the short-circuit current. Existing low-voltage switches, especially products such as relays and contactors, have weak short-term withstand capacity, which affects the stability of the low-voltage switch. Summary of the Invention

[0004] The purpose of this application is to provide a contact system, a load switch, and an electric meter, which can improve the comprehensive performance of the contact system, aiming at the deficiencies in the above-mentioned existing technologies.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of this application are as follows:

[0006] On the one hand, an embodiment of this application provides a contact system, including at least two groups of contact assemblies. Each group of contact assemblies includes a moving contact and a static contact that cooperate with each other. At least two contacts are provided on both the moving contact and the static contact. At least two contacts of the moving contact and at least two contacts of the static contact correspond one by one, so that after forming a parallel circuit connection between the moving contact and the static contact of each group of contact assemblies, a series circuit connection is formed between at least two groups of contact assemblies.

[0007] Optionally, in the parallel loop of each group of contact assemblies, the current directions between at least two contacts on the moving contact are the same as the current directions between at least two contacts on the static contact.

[0008] Optionally, adjacent two groups of contact assemblies form a series circuit connection through their respective moving contacts, or form a series circuit connection through their respective static contacts, or form a series circuit connection through the moving contact of one contact assembly and the static contact of another contact assembly.

[0009] Optionally, at least two groups of contact assemblies are arranged side by side in a column to form a linear arrangement.

[0010] Optionally, among at least two sets of contact assemblies, any two adjacent sets of contact assemblies are arranged side by side in two columns, and one ends of any two adjacent sets of contact assemblies are connected to form a U-shaped or V-shaped arrangement.

[0011] Optionally, among at least two sets of contact assemblies, any two adjacent sets of contact assemblies are arranged side by side in two columns, and both ends of any two adjacent sets of contact assemblies are respectively connected to form a square-shaped arrangement.

[0012] Optionally, among at least two sets of contact assemblies, any two adjacent sets of contact assemblies are provided with an elastic adjustment structure to adjust the distance between corresponding contacts.

[0013] Optionally, the elastic adjustment structure includes a soft sheet or a soft wire connected between two adjacent sets of contact assemblies.

[0014] Optionally, the moving contacts of at least two sets of contact assemblies are connected in series through a flexible connection.

[0015] Optionally, a magnetic enhancement body is provided on the side of the static contact away from the moving contact, and the magnetic enhancement body on the static contact is located in the parallel circuit region where the current of each set of contact assemblies is in the same direction.

[0016] Optionally, a magnetic enhancement body is provided on the side of the moving contact away from the static contact, and the magnetic enhancement body on the moving contact is located in the parallel circuit region where the current of each set of contact assemblies is in the same direction.

[0017] Optionally, magnetic enhancement bodies are provided on both sides of the moving contact close to and away from the static contact.

[0018] Optionally, one ends of any two adjacent sets of contact assemblies are connected to form a U-shaped or V-shaped arrangement, and a magnetic enhancement body is provided on the side of the series circuit region of at least two sets of contact assemblies facing the opening of the U-shaped or V-shaped.

[0019] On the other hand, an embodiment of the present application provides a load switch, including the above-mentioned contact system, as well as an electromagnetic system, an incoming busbar and an outgoing busbar. The electromagnetic system and the contact system are linked to drive the contact system to close and open, and the incoming busbar and the outgoing busbar are respectively connected to the contact system.

[0020] Optionally, an arc extinguishing chamber is provided on one side of at least one set of contact assemblies, and the arc extinguishing chamber is located at the arc starting position of the contacts.

[0021] Optionally, among one set of contact assemblies, between the moving contact and the static contact, the distance between at least one set of corresponding contacts is smaller than the distance between other sets of corresponding contacts, and the arc extinguishing chamber is provided at least on one side of the set of corresponding contacts with a smaller distance.

[0022] On yet another aspect, an embodiment of the present application provides an ammeter, including an instrument transformer and the above-mentioned load switch, and the instrument transformer is connected to the busbar outside the load switch.

[0023] The beneficial effects of the present application include:

[0024] The present application provides a contact system, a load switch, and an electric meter. The moving contact and the static contact of the contact assembly cooperate with each other. By providing at least two contacts on both the moving contact and the static contact, the moving contact and the static contact can form a parallel circuit connection. The parallel circuit enables the current to flow in the same direction through the moving contact and the static contact respectively. The current flowing in the same direction drives the moving contact and the static contact to be further pressed together, and the state of the moving contact and the static contact being in contact and pressed is more stable. When a short-circuit current flows through within a certain period of time, the ability of the contact assembly to resist the repulsive force impact and thermal impact of the short-circuit current is more stable, thereby improving the short-circuit withstand ability of the contact system. At the same time, the parallel connection also reduces the total repulsive force of the moving contact, which is beneficial to improving the dynamic stability of the short-circuit withstand. The parallel connection causes the current to be shunted, the current of the contact is reduced, and the heat dissipation area of the moving contact piece is increased, which is beneficial to improving the thermal stability of the short-circuit withstand performance. The contact system includes at least two groups of contact assemblies. After the moving contact and the static contact of the contact assemblies in the same group form a parallel circuit first, at least two groups of contact assemblies are connected in series to form a series circuit connection between at least two groups of contact assemblies. The series connection makes multiple breakpoints formed in the entire loop. Compared with a single breakpoint, the opening distance is doubled, the dielectric performance is significantly improved, and at the same time the arc is divided into multiple segments, the total arc voltage increases, and the arc extinguishing effect can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figures 1 to 13 It is a schematic structural diagram of the contact system provided by the embodiment of the present application;

[0027] Figures 14 to 17 、 Figure 20 It is a schematic structural diagram of the load switch provided by the embodiment of the present application;

[0028] Figure 18 、 Figure 19 It is a schematic diagram of the arc extinguishing chamber distribution of the load switch provided by the embodiment of the present application;

[0029] Figure 21 It is a schematic structural diagram of the electric meter provided by the embodiment of the present application.

[0030] Icons: 10A - load switch; 10B - mutual inductor; 10 - housing; 100 - contact assembly; 110 - moving contact; 111 - static contact; 101a - first moving contact; 101a1 - first moving contact point; 101a2 - second moving contact point; 101b - first static contact; 101b1 - first static contact point; 101b2 - second static contact point; 102a - second moving contact; 102a1 - first moving contact point; 102a2 - second moving contact point; 102b - second static contact; 102b1 - first static contact point; 102b2 - second static contact point; 103 - magnetizer; 104 - flexible wire; 105 - incoming busbar; 106 - outgoing busbar; 200 - electromagnetic system; 201 - driving block; 300 - arc extinguishing chamber; d1, d2 - distances. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0032] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. It should be noted that, without conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the protection scope of the present application.

[0033] It should be noted that like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0035] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0037] An embodiment of the present application provides a contact system. Please refer to Figure 1 , Figure 2 As shown, it includes at least two groups of contact assemblies 100. Each group of contact assemblies 100 includes a moving contact 110 and a stationary contact 111 that cooperate with each other. At least two contacts are provided on both the moving contact 110 and the stationary contact 111. The at least two contacts of the moving contact 110 and the at least two contacts of the stationary contact 111 correspond one by one, so that after the moving contact 110 and the stationary contact 111 of each group of contact assemblies 100 form a parallel circuit connection, a series circuit connection is formed between at least two groups of contact assemblies 100.

[0038] The moving contact 110 and the stationary contact 111 cooperate, and the moving contact 110 and the stationary contact 111 are in contact for closing and separated for opening. When the moving contact 110 and the stationary contact 111 are in contact in the present application, a parallel circuit connection can be formed between the two. When the circuits are in parallel, currents in the same direction flow through the moving contact 110 and the stationary contact 111 at the same time, so that the moving contact 110 and the stationary contact 111 are further pressed together, which is beneficial to improving the short withstand capacity. In addition, when arranged in parallel, the current of the main circuit can also be shunted. Assuming that the parallel contacts (a group of moving contact 110 and stationary contact 111) are n pairs, then the current flowing through each pair of contacts is 1 / n, and the Holm force FH between the contacts is reduced to 1 / n2 (the Holm force is proportional to the square of the current). At the same time, the currents of the moving and stationary contact rods are in the same phase, and the Lorentz force FL is an attractive force, so that the total repulsive force of the moving contact is further reduced (F 斥 = FH - FL), which is beneficial to improving the dynamic stability of the short withstand; in addition, due to current shunting, the current of the contacts is reduced, and the heat dissipation area of the moving contact piece is increased, which is beneficial to improving the thermal stability of the short withstand performance.

[0039] Further, to achieve a parallel circuit connection between the moving contact 110 and the static contact 111 in the same group, at least two contacts are provided on both the moving contact 110 and the static contact 111, and at least two contacts of the moving contact 110 and at least two contacts of the static contact 111 correspond to each other.

[0040] Exemplarily, as Figure 1 、 Figure 5 shown, in this application, a first moving contact 101a is provided with a first moving contact 101a1 and a second moving contact 101a2, and a first static contact 101b is correspondingly provided with a first static contact 101b1 and a second static contact 101b2. When current flows in from the static contact 111, one path of current flows through the first static contact 101b1 and the second static contact 101b2, and the other path of current is guided from the first static contact 101b1 to the first moving contact 101a1, and then flows out from the first moving contact 101a through the second moving contact 101a2, so that two parallel circuits can be formed.

[0041] On this basis, at least two sets of contact assemblies 100 can be provided in the contact system, and at least two sets of contact assemblies 100 form a series circuit connection.

[0042] As mentioned above, by forming a parallel circuit connection between the moving contact 110 and the static contact 111 in the same group, the short-term withstand capacity of the contact system can be improved. When there are at least two sets of contact assemblies 100, at least two sets of contact assemblies 100 are arranged side by side and connected in series.

[0043] When at least two sets of contact assemblies 100 are connected in series, multiple breakpoints can be formed in the entire circuit. Compared with a single non-series breakpoint, the opening distance is doubled, the dielectric performance is significantly improved, and at the same time the arc is divided into multiple segments, and the breaking voltage of each segment of the arc is reduced, which can significantly improve the arc extinguishing effect.

[0044] Therefore, in the contact system provided by the embodiments of the present application, the moving contact 110 and the static contact 111 of the contact assembly 100 cooperate with each other. By providing at least two contacts on both the moving contact 110 and the static contact 111, a parallel circuit connection can be formed between the moving contact 110 and the static contact 111; the parallel circuit enables the current to flow in the same direction through the moving contact 110 and the static contact 111 respectively. The current flowing in the same direction drives the moving contact 110 and the static contact 111 to be further pressed together, and the state of the moving contact 110 and the static contact 111 being in contact and pressed is more stable. When a short-circuit current flows through within a certain period of time, the ability of the contact assembly 100 to resist the repulsive force impact and thermal impact of the short-circuit current is more stable, thereby improving the short-circuit withstand ability of the contact system. At the same time, the parallel connection also reduces the total repulsive force of the moving contact 110, which is beneficial to improving the dynamic stability of the short-circuit withstand; the parallel connection causes the current to be shunted, the current of the contact is reduced, and the heat dissipation area of the moving contact piece is increased, which is beneficial to improving the thermal stability of the short-circuit withstand performance. The contact system includes at least two groups of contact assemblies 100. After the moving contact 110 and the static contact 111 of the contact assemblies 100 in the same group form a parallel circuit first, at least two groups of contact assemblies 100 are then connected in series to form a series circuit connection between at least two groups of contact assemblies 100. The series connection makes multiple breakpoints formed in the entire loop. Compared with a single breakpoint, the open distance is doubled, and the dielectric performance is significantly improved. At the same time, the arc is divided into multiple segments, and the total arc voltage increases, which can significantly improve the arc extinguishing effect.

[0045] Further, in the parallel circuit of each group of contact assemblies 100, the current directions between at least two contacts on the moving contact 110 are the same as the current directions between at least two contacts on the static contact 111.

[0046] As Figure 1 shown, when the current flows through the first moving contact 101a1 and the second moving contact 101a2 on the first moving contact 101a, and when the current flows through the first static contact 101b1 and the second static contact 101b2 on the first static contact 101b, the current flow directions are the same ( Figure 1 the dotted line in). After the contact assemblies 100 in the same group form a parallel circuit, they then form a series circuit with the contact assemblies 100 in other groups to achieve the above functions and effects.

[0047] Adjacent two groups of contact assemblies 100 are connected in series through their respective moving contacts 110, or through their respective static contacts 111, or through the connection between the moving contact 110 of one contact assembly 100 and the static contact 111 of another contact assembly 100 to form a series circuit connection.

[0048] When the moving contact 110 and the static contact 111 are arranged, there are different arrangement forms. Taking two groups of contact assemblies 100 as an example, as Figure 2As shown, the static contact 111 can be arranged above the moving contact 110, where the incoming busbar 105 and the outgoing busbar 106 are respectively connected to two moving contacts 110. In addition, the two sets of contact assemblies 100 can be connected in series through their respective moving contacts 110 or their respective static contacts 111. Figure 2 The two sets of contact assemblies 100 are connected in series through their respective first static contacts 101b and second static contacts 102b.

[0049] Whether it is the connection between the busbar and the contact, or the series connection of the two sets of contact assemblies 100, a flexible connection method can also be adopted. Figure 2 In [description], the incoming busbar 105 and the first moving contact 101a, and the outgoing busbar 106 and the second moving contact 102a are all connected through flexible wires 104; Figure 3 In [description], the first moving contact 101a and the second moving contact 102a are also connected by a flexible wire 104.

[0050] Similarly, the moving contact 110 can also be arranged above the static contact 111, such as Figure 3 As shown, the incoming busbar 105 and the outgoing busbar 106 are respectively connected to two static contacts 111.

[0051] It is also possible that in the two sets of contact assemblies 100, one moving contact 110 is located above the static contact 111, and the other static contact 111 is located above the moving contact 110. The incoming busbar 105 is connected to one of the moving contacts 110 or the static contact 111, and the outgoing busbar 106 is connected to the other static contact 111 or the moving contact 110. As Figure 4 shown, the first static contact 101b is located above the first moving contact 101a, and the second static contact 102b is located below the second moving contact 102a.

[0052] The arrangement positions of the above-mentioned moving contact 110 and static contact 111, the wiring method with the busbar (whether it is a flexible connection), the series connection method of the two contact assemblies 100 (whether it is a flexible connection, whether it is connected through the moving contact 110 or the static contact 111), etc. can all be arbitrarily combined, and the present application does not make specific limitations on this.

[0053] When at least two sets of contact assemblies 100 are arranged side by side, in one embodiment, please refer to Figure 5 , at least two sets of contact assemblies 100 can be arranged in a row to form a linear arrangement.

[0054] Such as Figure 5 shown, the two sets of contact assemblies 100 are sequentially connected through their respective moving contacts 110 to form a linear shape; such an arrangement structure is simple and the connection is convenient, and it can be applied to the layout of a contact system with a relatively large space.

[0055] When the two sets of contact assemblies 100 are connected, the formed loop is as Figure 6As shown, the current is introduced from the static contact 111 on one side. One path is from the first static contact point 101b1 through the first moving contact point 101a1 and the second moving contact point 101a2. Another parallel circuit passes through the first static contact point 101b1 and the second static contact point 101b2, and then the two circuits converge at the second moving contact point 101a2. The converged current is introduced into the first moving contact point 102a1 of another set of contact components 100. One path is from the first moving contact point 102a1 through the first static contact point 102b1 and the second static contact point 102b2. Another parallel circuit is from the first moving contact point 102a1 and the second moving contact point 102a2, and then the two circuits converge at the second static contact point 102b2 and then flow out from the static contact 111.

[0056] For the circuits with other arrangement modes of the contact components 100, or the circuits of two or more sets of contact components 100, refer to the above settings and will not be elaborated here.

[0057] In another embodiment, among at least two sets of contact components 100, any two adjacent sets of contact components 100 are arranged in two columns, and one end of any two adjacent sets of contact components 100 is connected to form a U-shaped or V-shaped arrangement.

[0058] Such as Figure 7 、 Figure 8 As shown, when there are two sets of contact components 100, one end of the two moving contacts 110 is connected and the other end is disconnected, so that the two sets of contact components 100 form a U-shaped arrangement; such an arrangement mode can effectively reduce the spatial layout of the contact system, making the contact system adaptable to the requirements of miniaturized scenarios. Of course, it can also be that one end of the two static contacts 111 is connected to make the two sets of contact components 100 form a U-shaped arrangement.

[0059] Based on the U-shaped or V-shaped arrangement, another possible embodiment is that among at least two sets of contact components 100, any two adjacent sets of contact components 100 are arranged in two columns, and both ends of the moving contacts 110 or the static contacts 111 of any two adjacent sets of contact components 100 are respectively connected to form a square-shaped arrangement.

[0060] Such as Figure 9 As shown, both ends of the two moving contacts 110 are respectively connected so that the two moving contacts 110 form a closed square-shaped structure, which is also beneficial to the miniaturized layout of the contact system.

[0061] In addition, another advantage of the square-shaped arrangement is that the closed square can make the left and right sides balanced, avoiding the formation of a lateral force on the moving contact 110 connected on one side when only one side of the two moving contacts 110 is connected, which is not conducive to the balance of the circuit.

[0062] In the U-shaped or V-shaped arrangement, for example Figure 8When the right side of the moving contact 110 is connected and the left side is disconnected, the current I1 in the busbar of the right-side connection section will generate a Lorentz force F in the self-excited magnetic field in the reverse U or V direction. L , so it will cause a lateral force to the right on the moving contact 110 connected on the right side. In the double-loop layout, Figure 9 As shown, since both sides of the moving contact 110 are connected, it is equivalent to adding a current I2 branch to the left-side connection section, and the current I1 in the right-side connection section decreases accordingly, and the self-excited magnetic field also decreases accordingly. The total lateral force in the double-loop layout is less than that in the U-shaped or V-shaped layout.

[0063] In addition, the static contact 111 is generally fixedly arranged. When two sets of contact assemblies 100 are connected in series through the static contact 111, the generated lateral force can be ignored.

[0064] As mentioned above, in the same set of contact assemblies 100, at least two contacts are provided on both the moving contact 110 and the static contact 110. To ensure that all contacts of the same set of contact assemblies 100 are in firm contact, in at least two sets of contact assemblies 100, there is an elastic adjustment structure on the moving contact 110 and the static contact 111 of any two adjacent sets of contact assemblies 100 to adjust the distance between the corresponding contacts.

[0065] In one embodiment, the elastic adjustment structure includes a soft sheet or a soft wire 104 connected between two adjacent sets of contact assemblies 100. In other words, two adjacent sets of contact assemblies 100 are soft-connected.

[0066] Exemplarily, when at least two sets of contact assemblies 100 are connected in series, the moving contacts 110 of at least two sets of contact assemblies 100 are connected in series through soft connection. As Figure 10 shown, a soft wire 104 can be used to connect the first moving contact 101a and the second moving contact 102a. The first static contact 101b corresponds to the first moving contact 101a, and the second static contact 102b corresponds to the second moving contact 102a. The two sets of contact assemblies 100 have a total of four contacts, which are in pairwise corresponding contact. The soft connection can ensure that the four contacts are in synchronous contact, avoiding the problem that some of the contacts cannot be in contact due to the structural rigidity deviation during hard connection.

[0067] In another embodiment, the elastic adjustment structure can also be a spring or a spring sheet; for example, a spring is provided on the side of the moving contact 110 and the static contact 111 where no contact is provided. Through the spring, the moving contact 110 and the static contact 111 can be squeezed, so that the contacts on the moving contact 110 and the contacts on the static contact 111 are pressed against each other. For example Figure 10 in, a spring can be provided below the static contact 111 to squeeze the static contact 111 upward to press it against the moving contact 110.

[0068] When connected to the contact assembly 100, at least one contact plate corresponding to the incoming busbar 105 or the outgoing busbar 106 is a spring piece, which can also achieve the function of all contacts of the same group of contact assemblies 100 being in contact.

[0069] Both the spring or spring piece and the aforementioned flexible connection can achieve the purpose of elastically adjusting the distance between the corresponding contacts so that all contacts are in effective contact.

[0070] In addition, in order to further increase the mutual attraction force between the moving contact 110 and the static contact 111, so that the moving contact 110 and the static contact 111 are pressed tighter, a magnetic enhancing body 103 can also be provided.

[0071] In one embodiment, as Figure 11 shown, magnetic enhancing bodies 103 are provided on the side of the static contact 111 away from the moving contact 110, and the magnetic enhancing bodies 103 on the static contact 111 are located in the parallel circuit area where the currents of each group of contact assemblies 100 are in the same direction.

[0072] A magnetic enhancing body 103 is provided on the static contact 111, and the magnetic enhancing body 103 is located on the side of the static contact 111 away from the moving contact 110. Moreover, the position of the magnetic enhancing body 103 is in the parallel circuit area where the currents are in the same direction.

[0073] Placing the magnetic enhancing body 103 on the side of the static contact 111 reduces the magnetic resistance of the self-excited magnetic field generated by the current of the static contact 111 and increases the magnetic induction intensity. Therefore, the Lorentz force of the current on the side of the moving contact 110 attracting each other in this self-excited magnetic field increases, so the attraction force between the moving contact 110 and the static contact 111 increases.

[0074] On this basis, as Figure 7 shown, magnetic enhancing bodies 103 are provided on the side of the moving contact 110 away from the static contact 111, and the magnetic enhancing bodies 103 on the moving contact 110 are located in the parallel circuit area where the currents of each group of contact assemblies 100 are in the same direction.

[0075] In addition to providing the magnetic enhancing body 103 on the side of the static contact 111, a magnetic enhancing body 103 is also provided on the side of the moving contact 110, and the setting position is the same as that of the static contact 111, both being set in the parallel circuit area where the currents of the contact assembly 100 are in the same direction.

[0076] In this way, magnetic enhancing bodies 103 are provided on both the side of the moving contact 110 and the side of the static contact 111. The two magnetic enhancing bodies 103 are magnetized in the self-excited magnetic fields generated by the currents of the moving contact 110 and the static contact 111, forming an attracting effect like an electromagnet. The magnetic enhancing body 103 above the static contact 111 will press down the moving contact 110, further pressing the moving contact 110 and the static contact 111 tightly.

[0077] Another situation is, as Figure 12 、 Figure 13As shown, magnetic flux intensifiers 103 are provided on both sides where the moving contact 110 approaches and separates from the static contact 111. In other words, magnetic flux intensifiers 103 are provided on both the upper and lower sides of the moving contact 110, and the placement position of the magnetic flux intensifiers 103 is not limited at this time.

[0078] Another possible situation is that, as Figure 8 shown, one end of any two adjacent sets of contact assemblies 100 is connected to form a U-shaped or V-shaped arrangement, and the magnetic flux intensifier 103 is also provided on one side of the series circuit region of at least two sets of contact assemblies 100 facing the opening of the U-shape or V-shape.

[0079] As Figure 5 、 Figure 7 shown, magnetic flux intensifiers 103 are respectively provided on the moving contact 110 and the static contact 111. Figure 8 When the two moving contacts 110 are connected, magnetic flux intensifiers 103 are respectively provided on the upper and lower sides of the connection position; and the magnetic flux intensifiers 103 here form a U-shaped structure, wrapping the inner side ( Figure 8 the left side in Figure 8 ), and exposing the outer side (

[0080] the right side in

[0081] ). In this way, it is equivalent to setting a magnetic flux intensifier 103 on the left side, increasing the magnetic force on the left side and reducing the lateral force on the right side.

[0082] Based on this, on the other hand, an embodiment of the present application further provides a load switch 10A, which includes the above-mentioned contact system, as well as an electromagnetic system 200, an incoming bus 105 and an outgoing bus 106. The electromagnetic system 200 is linked with the contact system to drive the contact system to open and close, and the incoming bus 105 and the outgoing bus 106 are respectively connected to the contact system 200.

[0083] The load switch 10A can be a relay or a contactor, etc. As Figure 14 、 Figure 15 shown, the load switch 10A includes a housing 10. A contact assembly 100 is provided inside the housing 10, and an electromagnetic system 200 is also provided. The electromagnetic system 200 serves as the power of the contact assembly 100, and the electromagnetic system 200 is respectively linked with the moving contacts 110 of at least two sets of contact assemblies 100 to synchronously drive the moving contacts 110 of at least two sets of contact assemblies 100 to move.

[0084] The electromagnetic system 200 drives the moving iron core to move. The moving iron core pushes the moving contact 110 towards the static contact 111 through the driving block 201, so that the moving contact 110 and the static contact 111 are in contact; when the moving iron core moves in the reverse direction, it drives the moving contact 110 away from the static contact 111, so that the two are separated.

[0085] Figure 16 、 Figure 17 An example of the contact assembly 100 applied to the load switch 10A is shown. Among them, the moving contact 110 and the static contact 111 can be presented in a bent form, and both ends of the moving contact 110 and the static contact 111 are upturned to reduce the overall volume of the contact assembly 100.

[0086] In this application, at least two moving contacts 110 are synchronously pushed by a driving block 201 to move synchronously, so that at least two groups of contact assemblies 100 are synchronously switched on and off.

[0087] In this application, an arc extinguishing chamber 300 is further provided on one side of at least one group of contact assemblies 100, and the arc extinguishing chamber 300 is located at the arc starting position of the contacts. The arc starting position of the contacts is generally located at the contact position corresponding to the moving contact 110 and the static contact 111.

[0088] The arc extinguishing chamber 300 can be Figure 15 one of them, or multiple, for example Figure 18 、 Figure 19 shown, and an arc extinguishing chamber 300 is provided at each corresponding contact position of each group.

[0089] In a group of contact assemblies 100, between the moving contact 110 and the static contact 111, the distance between at least one group of corresponding contacts is smaller than the distance between other groups of corresponding contacts, and the arc extinguishing chamber 300 is at least provided on one side of the group of contacts with a smaller distance.

[0090] For example Figure 20 in, the distance d1 between the corresponding contacts on the left is less than the distance d2 between the corresponding contacts on the right, so an arc extinguishing chamber 300 is provided near the left contact.

[0091] When the distance between the corresponding contacts is small, this position is the arc starting point and then separates, so the arc extinguishing chamber 300 should be at least provided at this position. The arc extinguishing chamber 300 can be provided at other contact positions as needed, for example Figure 18 shown.

[0092] The embodiment of this application also provides an electric meter, as Figure 21 shown, including a transformer 10B and the above-mentioned load switch 10A, and the transformer 10B is connected to the busbar external to the load switch 10A.

[0093] Furthermore, the transformer 10B is sleeved on the busbar external to the load switch 10A.

[0094] The load switch 10A and the electricity meter include the same structure and beneficial effects as the contact system in the foregoing embodiment. The structure and beneficial effects of the contact system have been described in detail in the foregoing embodiment and will not be elaborated herein.

[0095] The foregoing is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A contact system, characterized in that, It includes at least two groups of contact assemblies (100). Each group of the contact assemblies (100) includes a movable contact (110) and a stationary contact (111) that cooperate with each other. At least two contacts are provided on both the movable contact (110) and the stationary contact (111). At least two of the contacts on the movable contact (110) and at least two of the contacts on the stationary contact (111) correspond one by one. After forming a parallel circuit connection between the movable contact (110) and the stationary contact (111) of each group of the contact assemblies (100), a series circuit connection is further formed between at least two groups of the contact assemblies (100).

2. The contact system according to claim 1, characterized in that, In the parallel loop of each group of the contact assemblies (100), the current directions between at least two of the contacts on the movable contact (110) are the same as the current directions between at least two of the contacts on the stationary contact (111).

3. The contact system according to claim 1, characterized in that, Adjacent two groups of the contact assemblies (100) form a series circuit connection through their respective movable contacts (110), or form a series circuit connection through their respective stationary contacts (111), or form a series circuit connection through the movable contact (110) of one of the contact assemblies (100) and the stationary contact (111) of the other contact assembly (100).

4. The contact system according to claim 1, characterized in that, At least two groups of the contact assemblies (100) are arranged in a row to form a linear arrangement.

5. The contact system according to claim 1, characterized in that Among at least two groups of the contact assemblies (100), any adjacent two groups of the contact assemblies (100) are arranged in two rows, and one end of any adjacent two groups of the contact assemblies (100) is connected to form a U-shaped or V-shaped arrangement.

6. The contact system according to claim 1, characterized in that, Among at least two groups of the contact assemblies (100), any adjacent two groups of the contact assemblies (100) are arranged in two rows, and both ends of any adjacent two groups of the contact assemblies (100) are respectively connected to form a square arrangement.

7. The contact system according to claim 1, characterized in that, Among at least two groups of the contact assemblies (100), any adjacent two groups of the contact assemblies (100) are provided with an elastic adjustment structure to adjust the distance between the corresponding contacts.

8. The contact system according to claim 7, characterized in that, The elastic adjustment structure includes a soft sheet or a soft wire (104) connected between adjacent two groups of the contact assemblies (100).

9. The contact system according to any one of claims 1 to 8, characterized in that, A magnetic enhancement body (103) is provided on the side of the stationary contact (111) away from the movable contact (110). The magnetic enhancement body (103) on the stationary contact (111) is located in the parallel loop area where the current of each group of the contact assemblies (100) is in the same direction.

10. The contact system according to claim 9, characterized in that, A magnetic enhancement body (103) is provided on the side of the movable contact (110) away from the stationary contact (111). The magnetic enhancement body (103) on the movable contact (110) is located in the parallel loop area where the current of each group of the contact assemblies (100) is in the same direction.

11. The contact system according to any one of claims 1 to 8, characterized in that, Magnetic enhancement bodies (103) are provided on both sides of the movable contact (110) close to and away from the stationary contact (111).

12. The contact system according to any one of claims 1 to 8, characterized in that, One end of any two adjacent contact assemblies (100) is connected to form a U-shaped or V-shaped arrangement, and a magnetic booster (103) is further provided on one side of the series circuit region of at least two contact assemblies (100) facing the opening of the U-shaped or V-shaped.

13. A load switch, characterized in that, It includes the contact system according to any one of claims 1 to 12, as well as an electromagnetic system (200), an incoming busbar (105) and an outgoing busbar (106), wherein the electromagnetic system (200) and the contact system are linked to drive the contact system to close and open, and the incoming busbar (105) and the outgoing busbar (106) are respectively connected to the contact system.

14. The load switch according to claim 13, characterized in that, An arc extinguishing chamber (300) is provided on one side of at least one group of the contact assemblies (100), and the arc extinguishing chamber (300) is located at the arc starting position of the contacts.

15. The load switch according to claim 13, characterized in that, In one group of the contact assemblies (100), between the moving contact (110) and the static contact (111), the distance between at least one group of corresponding contacts is smaller than the distance between the corresponding contacts of other groups, and the arc extinguishing chamber (300) is at least provided on one side of the group of corresponding contacts with a smaller distance.

16. An electric meter, characterized in that, It includes an instrument transformer (10B) and a load switch (10A) according to any one of claims 13 to 15, and the instrument transformer (10B) is connected to the busbar outside the load switch (10A).

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