Load switch and ammeter

Abstract

The invention provides a load switch and an ammeter, and relates to the technical field of electrical equipment. The load switch comprises a shell, a static contact, a moving contact, an armature assembly, an electromagnetic assembly and a protection mechanism. The static contact, the moving contact, the armature assembly, the electromagnetic assembly and the protection mechanism are all arranged in the shell, the moving contact and the armature assembly are movably arranged in the shell, and the armature assembly is in transmission connection with the moving contact; the electromagnetic assembly is used for driving the armature assembly to move so as to drive the moving contact and the static contact to be switched on or switched off. The protection mechanism is used for driving the armature assembly to move when the moving contact and the static contact are switched on and short-circuit fault current comes so as to drive the moving contact and the static contact to be switched off. Therefore, the load switch controls the closing and opening of the moving contact through the electromagnetic assembly and the protection mechanism together through the armature assembly, the structure is simple, the number of required parts is small, the size of the load switch is small, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a load switch and an electric meter. Background Art

[0002] In the prior art, the load switch is placed inside the smart meter and used in combination with the current transformer to determine whether there is electricity theft or leakage, and to control the on and off of the built-in load switch by measuring the electric energy. However, the load switch inside the meter does not have the fault current protection function, and an external electric energy meter circuit breaker is still required to disconnect the circuit in time when a fault occurs in the electrical circuit, resulting in cumbersome installation steps, overlapping functions, and complex structures, which lead to cost increases. Therefore, there is an urgent need for a built-in load switch for an electric meter that can have a protective action function. Summary of the invention

[0003] The present invention provides a load switch and an electric meter, which have a simple structure and a relatively small number of parts, thereby effectively improving assembly efficiency and reducing production costs.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a load switch, comprising:

[0006] case;

[0007] A stationary contact, wherein the stationary contact is arranged on the housing;

[0008] A moving contact, wherein the moving contact is movably disposed on the housing;

[0009] An armature assembly, the armature assembly is movably disposed on the housing, and the armature assembly is transmission-connected to the moving contact;

[0010] An electromagnetic assembly, the electromagnetic assembly is arranged in the housing, and the electromagnetic assembly is used to drive the armature assembly to move along a first direction to a first position to drive the moving contact to close; or drive the armature assembly to move along a second direction to a second position to drive the moving contact to open, wherein the first direction and the second direction are opposite directions;

[0011] A protection mechanism is arranged in the shell, and is used to drive the armature assembly to move along the second direction when the moving contact and the static contact are in a closed state and when a fault current occurs, so as to drive the moving contact and the static contact to open.

[0012] In an optional embodiment, the protection mechanism includes a protection yoke and a connecting conductor, at least a portion of the connecting conductor is passed through the protection yoke, the protection yoke includes a connecting portion, and an attraction portion arranged at both ends of the connecting portion, the attraction portion is used to magnetically attract the armature assembly when a short-circuit fault current flows through the connecting conductor, so as to drive the armature assembly to move, thereby driving the moving contact and the static contact to open.

[0013] In an optional embodiment, the armature assembly includes an armature part and a mating part, wherein the mating part is arranged at one end of the armature part, the protective yoke is located on one side of the armature part and cooperates with the mating part, and the attraction portion can attract the mating part to drive the armature assembly to move.

[0014] In an optional embodiment, the armature assembly includes an armature part and an attraction part, the attraction part is arranged on a side of the armature part away from the electromagnetic assembly, the protective yoke cooperates with the attraction part, and the attraction portion can attract the attraction part to drive the armature assembly to move.

[0015] In an optional embodiment, the armature member includes a mounting portion and a first armature portion, a second armature portion and a magnet arranged on the mounting portion, and the protective yoke is located on a side adjacent to the first armature portion.

[0016] In an optional embodiment, the armature member also includes a rotating shaft, which is disposed on the shell, and the mounting portion is rotatably disposed on the shell, and the attraction of the attraction portion to the attraction member located on one side of the center line (B) of the armature assembly is greater than the attraction of the attraction member located on the other side of the center line (B), and the center line (B) is a straight line perpendicular to the longitudinal center lines of the first armature portion and the second armature portion and passing through the center of the rotating shaft.

[0017] In an optional embodiment, a mating piece is provided at one end of the first armature part or an attraction piece is provided on one side of the first armature part, the protective yoke is located on one side of the first armature part and cooperates with the mating piece or the attraction piece, and the attraction piece can attract the mating piece or the attraction piece and thereby drive the armature assembly to move along the second direction.

[0018] In an optional embodiment, when a short-circuit fault current occurs, the driving force generated by the protective yoke on the armature assembly is greater than the retaining force generated by the electromagnetic assembly on the armature assembly.

[0019] In an optional embodiment, the connecting conductor is connected to the moving contact, the protective yoke, the armature assembly and the electromagnetic assembly are arranged in sequence along a third direction, the armature assembly, the moving contact / the static contact are arranged in sequence along a fourth direction, and the third direction is perpendicular to the fourth direction.

[0020] In an optional embodiment, the load switch also includes a connecting rod, and the moving contact is rotatably disposed on the housing via a rotating shaft. One end of the connecting rod is connected to the armature assembly, and the other end is connected to the moving contact. The armature assembly drives the connecting rod to move, so as to drive the moving contact to rotate around the rotating shaft and close or open the switch with the static contact.

[0021] In a second aspect, the present invention provides an electric meter, wherein a load switch as described in any one of the aforementioned embodiments is arranged in a housing of the electric meter.

[0022] The beneficial effects of the load switch and the electric meter provided by the embodiment of the present invention include: by energizing the electromagnetic component to drive the armature component to move, the armature component drives the moving contact to move toward or away from the static contact, so as to achieve the closing or opening of the moving contact and the static contact; and in the closed state, when the circuit is in a fault state such as a short circuit, the protection mechanism can drive the armature component to drive the moving contact to move in the direction of opening through the armature component, so as to timely achieve the opening of the moving contact and the static contact. Therefore, the load switch provided by this embodiment controls the closing and opening of the moving contact through the electromagnetic component and the protection mechanism through the armature component, and has a simple structure and requires a small number of parts, thereby making the load switch smaller and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram of a first embodiment of a load switch provided in an embodiment of the present invention;

[0025] Figure 2 A partial structural diagram of a first embodiment of a load switch provided by an embodiment of the present invention;

[0026] Figure 3 A partial structural diagram of a second embodiment of a load switch provided by an embodiment of the present invention;

[0027] Figure 4 A partial structural diagram of a third embodiment of a load switch provided in an embodiment of the present invention.

[0028] Icons: 10-load switch; 100-static contact; 200-moving contact; 300-armature assembly; 311-installation part; 312-first armature part; 313-second armature part; 314-rotating shaft; 320-matching part; 330-attraction part; 400-electromagnetic assembly; 410-coil assembly; 420-yoke part; 500-protection mechanism; 510-protection yoke; 511-connecting part; 512-attraction part; 520-connecting conductor; 600-connecting rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do 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 therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0034] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0035] In the prior art, the load switch is placed inside the smart meter and used in combination with the current transformer to determine whether there is electricity theft or leakage, and to control the on and off of the built-in load switch by measuring the electric energy. However, the load switch inside the meter does not have the fault current protection function, and an external electric energy meter circuit breaker is still required to disconnect the circuit in time when a fault occurs in the electrical circuit, resulting in cumbersome installation steps, overlapping functions, and complex structures, which lead to cost increases. Therefore, there is an urgent need for a built-in load switch for an electric meter that can have a protective action function.

[0036] Based on the above questions, please refer to Figure 1 and Figure 2 The embodiment of the present invention provides a load switch 10, which is applied to electrical equipment, especially to electric meters. The load switch 10 provided by the present invention has a simple structure and a relatively small number of parts, which effectively improves assembly efficiency and reduces production costs.

[0037] In detail, the load switch 10 includes a housing (not shown), a stationary contact 100 , a moving contact 200 , an armature assembly 300 , an electromagnetic assembly 400 and a protection mechanism 500 .

[0038] Among them, the static contact 100, the moving contact 200, the armature assembly 300, the electromagnetic assembly 400 and the protection mechanism 500 are all arranged in the shell. In particular, the moving contact 200 and the armature assembly 300 can be movably arranged in the shell, and the armature assembly 300 is transmission-connected with the moving contact 200; the electromagnetic assembly 400 is used to drive the armature assembly 300 to move along the first direction to the first position to drive the moving contact 200 to close the switch; or drive the armature assembly 300 to move along the second direction to the second position to drive the moving contact 200 to open the switch, wherein the first direction and the second direction are opposite directions.

[0039] It can be understood that the first position is the position of the armature assembly 300 where the moving contact 200 and the static contact 100 are in the closed state, and the second position is the position of the armature assembly 300 where the moving contact 200 and the static contact 100 are in the open state; taking the figure as an example, in this embodiment, the first direction can be clockwise, and the second direction can be counterclockwise. Of course, in other embodiments, the first direction can also be counterclockwise, and the second direction can be clockwise; or the first direction and the second direction can be up and down or left and right, which can be adjusted according to actual product requirements and are not limited here.

[0040] In this embodiment, the electromagnetic assembly 400 is energized to drive the armature assembly 300 to move, thereby driving the moving contact 200 to move toward or away from the static contact 100 through the armature assembly 300, thereby achieving the closing or opening of the moving contact 200 and the static contact 100; and in the closed state, when the circuit is in a fault state where a short-circuit current is approaching, the protection mechanism 500 can drive the armature assembly 300, so as to drive the moving contact 200 to move in the opening direction through the armature assembly 300, thereby achieving the opening of the moving contact 200 and the static contact 100 in time.

[0041] Therefore, the load switch 10 provided in this embodiment controls the closing and opening of the moving contact 200 through the electromagnetic component 400 and the protection mechanism 500 through the armature component 300. The structure is simple and the number of required parts is small, so that the load switch 10 is smaller in size and the production cost is reduced.

[0042] It should be noted that the moving contact 200 can be slidably set on the shell, and can also be rotatably set on the shell, that is, the moving contact 200 can be a direct-moving contact bridge structure, and can also be a rotating snap-fit ​​structure; in addition, the armature assembly 300 can be rotatably set on the shell, and can also be linearly slidably set on the shell, which can be adjusted according to actual product requirements and is not specifically limited here.

[0043] Furthermore, the protection mechanism 500 includes a protection yoke 510 and a connecting conductor 520, wherein the connecting conductor 520 is at least partially passed through the protection yoke 510, and the protection yoke 510 is used to magnetically attract the armature assembly 300 when a short-circuit fault current occurs, so as to drive the armature assembly 300 to move, thereby driving the moving contact 200 and the static contact 100 to open the circuit.

[0044] In this embodiment, the protection mechanism 500 only includes a yoke and a connecting conductor 520. The connecting conductor 520 is at least partially covered on the protection yoke 510, and the connecting conductor 520 is connected to the main circuit. Therefore, when a short-circuit fault current occurs, the protection yoke 510 can magnetically attract the armature assembly 300, causing the armature assembly 300 to move and drive the moving contact 200 and the static contact 100 to open.

[0045] It can be seen that the protection mechanism 500 has a simple structure and few parts, and the armature assembly 300 can be reused for cooperation with the protection mechanism 500; further, the armature assembly 300 can be directly driven, and the driving action can be completed at one time regardless of the number of contacts, and the driving action is unified, so that the contact structure can be simpler; in addition, the number of parts is reduced, and a large space is avoided for the main circuit; not only that, in the case of a short circuit, the opening action can be completed within a few ms.

[0046] For further information, see Figure 2The protective yoke 510 includes a connecting portion 511, and an attraction portion 512 is provided at both ends of the connecting portion 511 to form a U-shaped structure together. The connecting portion 511 and the attraction portion 512 can be integrally formed as shown in the present embodiment, or can be separately provided. When a short circuit or other fault occurs in the main circuit circuit connected to the connecting conductor 520, the large current generated by the connecting conductor 520 can enable the attraction portion 512 to apply a driving force to the armature assembly 300. The driving force is opposite to the direction of the holding force applied by the electromagnetic assembly 400 to the armature assembly 300, so that the armature assembly 300 moves in the second direction, thereby further directly driving the moving contact 200 and the static contact 100 to open the gate.

[0047] Further, in one embodiment of the present invention, the armature assembly 300 includes an armature member and a matching member 320 disposed at one end of the armature member, that is, the matching member 320 is extended along one end of the armature member, the protective yoke 510 is located at one side of the armature member and cooperates with the matching member 320, and the attracting portion 512 can attract the matching member 320 to drive the armature assembly 300 to move. In this embodiment, the matching member 320 is integrally formed with the armature member, and of course in other embodiments, the matching member 320 can also be connected to the armature member at one end of the armature member by riveting or other processing methods.

[0048] Furthermore, in another embodiment of the present invention, the armature assembly 300 includes an armature part and an attraction member 330 disposed on the side of the armature part away from the electromagnetic assembly 400. The attraction portion 512 and the attraction member 330 are disposed correspondingly. When power is turned on, a magnetic field is generated, and an electromagnetic attraction force is generated between the attraction portion 512 and the attraction member 330. When a fault short-circuit current comes, the attraction portion 512 is driven to drive the armature assembly 300 to move in the second direction, thereby driving the moving contact 200 and the static contact 100 to open. The armature part and the attraction member are arranged at intervals to prevent the protection mechanism 500 from interfering with the electromagnetic assembly 400 driving the armature part, and to make the overall structure of the armature assembly 300 more compact. In addition, in addition to being used for short-circuit protection, the attraction member 330 can also play a role in magnetic shielding to prevent the external magnetic source or the magnetic attraction force of the protective yoke 510 from interfering with the armature part.

[0049] It should be noted that the matching member 320 or the attracting member 330 is made of iron material.

[0050] The armature assembly 300 can be driven to rotate or linearly move in a first direction or a second direction to drive the moving contact 200 to move. The first direction and the second direction are opposite directions and can be adjusted according to actual product requirements and are not limited here.

[0051] Furthermore, in this embodiment, the electromagnetic assembly 400 drives the armature assembly 300 to rotate in the first direction or the second direction to drive the moving contact 200 and the stationary contact 100 to close or open. The protective yoke 510 can drive the armature assembly 300 to rotate in the second direction when a short-circuit fault current flows through the connecting conductor 520 to drive the moving contact 200 and the stationary contact 100 to open. The first direction and the second direction are opposite rotation directions.

[0052] In this embodiment, the electromagnetic assembly 400 drives the armature assembly 300 to rotate in a first direction, so as to drive the moving contact 200 to move in a direction close to the static contact 100 through the armature assembly 300 to achieve closing of the circuit with the static contact 100. Of course, the electromagnetic assembly 400 can also drive the armature assembly 300 to rotate in a second direction, so as to drive the moving contact 200 to move in a direction away from the static contact 100 through the armature assembly 300 to achieve opening of the circuit with the static contact 100.

[0053] Furthermore, the armature member includes a mounting portion 311 and a first armature portion 312 and a second armature portion 313 arranged on both sides of the mounting portion 311, wherein the first armature portion 312 is located on the left side of the mounting portion 311, and the second armature portion 313 is located on the right side of the mounting portion 311, and the first armature portion 312 and the second armature portion 313 are fixedly connected through the mounting portion 311 to form an overall synchronous movement, and the protection mechanism 500 is located on the side adjacent to the first armature portion 312.

[0054] It is worth mentioning that the armature component further includes a magnet, which is disposed on the mounting portion 311 and located between the first armature portion 312 and the second armature portion 313 .

[0055] In detail, Figure 4 As shown, the fitting 320 is disposed at one end of the first armature portion 312, and the protective yoke 510 is located on one side of the first armature portion 312 and cooperates with the fitting 320. The attraction portion 512 can attract the fitting 320 and then drive the entire armature assembly 300 to move along the second direction.

[0056] The electromagnetic assembly 400 includes a coil assembly 410 and two yoke parts 420. The two yoke parts 420 can be connected to the first armature part 312 and the second armature part 313 on both sides respectively when the electromagnetic assembly 400 is energized, so as to open or close the moving contact 200 and the static contact 100; and the protective yoke 510 is used to attract the armature assembly 300 when a short-circuit fault current occurs, so as to open the moving contact 200 and the static contact 100.

[0057] It should be noted that the coil assembly 410 generally includes components such as a coil, a coil frame and an iron core. The coil is arranged on the coil frame, the iron core is arranged in the coil frame, and both yokes are connected to the iron core.

[0058] In detail, in another embodiment, Figure 1-Figure 3 As shown, the attracting member 330 is disposed on a side of the first armature portion 312 away from the electromagnetic assembly 400 to cooperate with the protection mechanism 500. When a short-circuit fault current comes, the attracting member 330 is attracted by the attracting member 512 to drive the armature member to move synchronously. Further, the attracting member 330 is located between the connecting portion 511 and the first armature portion 312. Of course, in other embodiments, the connecting portion 511 and the first armature portion 312 can also be located on the same side of the attracting member 330.

[0059] In this embodiment, the two attraction parts 512 are connected to the two ends of the connecting part 511 and together form a U-shaped structure. It can be understood that the armature assembly 300 is also provided with two corresponding attraction members 330, so that when the protective yoke 510 generates magnetism, the attraction member 330 or the matching member 320 of the armature assembly 300 is jointly adsorbed by the two attraction parts 512, so as to improve the adsorption effect and ensure that the armature assembly 300 rotates rapidly under the magnetic attraction of the protective yoke 510, so that the moving contact 200 is disconnected from the static contact 100 in time.

[0060] Furthermore, the armature also includes a rotating shaft 314, which is disposed on the housing, and the mounting portion 311 is rotatably disposed on the housing through the rotating shaft 314. The attraction of the attraction portion 512 to the attraction member 330 located on one side of the center line (B) of the armature assembly 300 is greater than the attraction of the attraction member 330 located on the other side of the center line (B), so as to ensure that when a fault current occurs, the protection mechanism 500 always applies a force to the armature assembly 300 to make it move as a whole in the second direction, wherein the center line (B) is a straight line perpendicular to the longitudinal center lines of the first armature portion 312 and the second armature portion 313 and passing through the center of the rotating shaft 314 (such as Figure 3 That is, when the fault current comes, the attraction portion 512 drives the armature assembly 300 to move in the second direction to the desired position. Figure 3 The length of the attraction portion 512 for contacting / approaching the attraction member 330 is asymmetric along the center line (B), thereby ensuring that when a short circuit current occurs, the attraction of the attraction portion 512 to the armature assembly 300 enables it to move in the second direction.

[0061] Furthermore, if Figure 3 As shown, in this embodiment, the transverse center line of the suction portion 512 (as shown by the dotted line A) is located on one side of the transverse center line of the rotating shaft 314 (as shown by the dotted line C), that is, the suction portion 512 is located on the upper side of the horizontal line where the rotating shaft 314 is located, so as to ensure that the suction portion 512 attracts the suction member 330 to drive the armature member to move along the second direction. Of course, in other embodiments of the present invention, the suction portion 512 can also be located on the lower right side of the horizontal line where the rotating shaft 314 is located, as long as it can achieve the goal of driving the armature member to move along the second direction, and no specific limitation is made here.

[0062] Furthermore, since the armature assembly 300 is always subject to the holding force of the electromagnetic assembly 400 in the closed state, in order to ensure that the protective yoke 510 can enable the armature assembly 300 to move, when a short-circuit fault current occurs, the driving force generated by the protective yoke 510 on the armature assembly 300 is greater than the holding force generated by the electromagnetic assembly 400 on the armature assembly 300.

[0063] Furthermore, the end of the attraction portion 512 for adsorbing the armature assembly 300 is arranged to be inclined.

[0064] In this embodiment, the attraction portion 512 is arranged in a trapezoidal shape, that is, as shown in the figure, the attraction portion 512 is inclined near the side of the armature assembly 300, so that the armature assembly 300 is in a vertical state, and the distance between the side of the attraction portion 512 and the armature assembly 300 gradually decreases in the vertical downward direction to ensure that when a short-circuit current occurs, the attraction portion 512 applies a force to the armature assembly 300 to make it move in the second direction.

[0065] Further, the protective yoke 510, the armature assembly 300 and the electromagnetic assembly 400 are sequentially arranged along the third direction, the armature assembly 300, the moving contact 200 and the static contact 100 are sequentially arranged along the fourth direction, and the third direction is perpendicular to the fourth direction.

[0066] In this embodiment, the layout of the load switch 10 is shown in the figure. In this case, the third direction is the horizontal direction and the fourth direction is the vertical direction. Therefore, by arranging the protective yoke 510, the armature assembly 300 and the electromagnetic assembly 400 in sequence along the horizontal direction, and arranging the armature assembly 300, the moving contact 200 and the static contact 100 in sequence along the vertical direction, the internal layout of the load switch 10 is reasonable.

[0067] It can be understood that the third direction being perpendicular to the fourth direction means that the angle between the third direction and the fourth direction is about 90°, not just 90°.

[0068] Furthermore, the load switch 10 also includes a connecting rod 600, and the moving contact 200 is rotatably arranged on the shell through a rotating shaft. One end of the connecting rod 600 is connected to the armature assembly 300, and the other end is connected to the moving contact 200. The armature assembly 300 drives the connecting rod 600 to move, so as to drive the moving contact 200 to rotate around the rotating shaft and close or open the switch with the static contact 100.

[0069] In this embodiment, by setting a connecting rod 600, the moving contact 200 is transmission-connected to the armature assembly 300 through the connecting rod 600, so that when the armature assembly 300 rotates, the moving contact 200 is driven to rotate through the connecting rod 600, so as to realize the closing and opening of the moving contact 200 and the static contact 100. The moving contact 200 is rotatably arranged on the shell and the static contact 100 for closing and closing, which makes the overall structure of the load switch simpler, and facilitates the connection of the conductor 520 with the main circuit so that when a short-circuit fault current flows through the main circuit, the protection mechanism 500 can drive the armature assembly 300 to move and drive the moving contact 200 and the static contact 100 to open.

[0070] In summary, the embodiment of the present invention provides a load switch 10, which drives the armature assembly 300 to rotate by energizing the electromagnetic assembly 400, thereby driving the movable contact 200 to move toward or away from the static contact 100 through the armature assembly 300, thereby realizing the closing or opening of the movable contact 200 and the static contact 100; and in the closed state, when the short-circuit fault current comes, the protection mechanism 500 can drive the armature assembly 300 to drive the movable contact 200 to move in the opening direction through the armature assembly 300, thereby realizing the opening of the movable contact 200 and the static contact 100 in time. Therefore, the load switch 10 provided in this embodiment controls the closing and opening of the movable contact 200 through the electromagnetic assembly 400 and the protection mechanism 500 through the armature assembly 300, has a simple structure, and requires a small number of parts, so that the load switch 10 is small in size and reduces the production cost.

[0071] Furthermore, an embodiment of the present invention further provides an electric meter, wherein a load switch 10 according to the above embodiment is arranged inside a housing of the electric meter.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A load switch (10), characterized in that: include: case; A stationary contact (100), the stationary contact (100) being arranged on the housing; A moving contact (200), the moving contact (200) being movably arranged on the housing; An armature assembly (300), the armature assembly (300) being movably disposed on the housing, and the armature assembly (300) being transmission-connected to the moving contact (200); An electromagnetic assembly (400), the electromagnetic assembly (400) being arranged on the housing, the electromagnetic assembly (400) being used to drive the armature assembly (300) to move along a first direction to a first position, so as to drive the moving contact (200) to close; or to drive the armature assembly (300) to move along a second direction to a second position, so as to drive the moving contact (200) to open, wherein the first direction and the second direction are opposite directions; A protection mechanism (500) is provided on the housing, and is used to drive the armature assembly (300) to move along the second direction when the moving contact (200) and the stationary contact (100) are in a closed state, and when a fault current occurs, so as to drive the moving contact (200) and the stationary contact (100) to open.

2. The load switch (10) according to claim 1, characterized in that: The protection mechanism (500) comprises a protection yoke (510) and a connecting conductor (520), at least a portion of the connecting conductor (520) is passed through the protection yoke (510), and the protection yoke (510) comprises a connecting portion (511) and an attracting portion (512) arranged at both ends of the connecting portion (511), the attracting portion (512) being used to magnetically attract the armature assembly (300) when a short-circuit fault current flows through the connecting conductor (520), so as to drive the armature assembly (300) to move, so as to drive the moving contact (200) and the stationary contact (100) to open.

3. The load switch (10) according to claim 2, characterized in that: The armature assembly (300) comprises an armature part and a matching part (320), wherein the matching part (320) is arranged at one end of the armature part, the protective yoke (510) is located at one side of the armature part and matches with the matching part (320), and the attraction portion (512) can attract the matching part (320) to drive the armature assembly (300) to move.

4. The load switch (10) according to claim 2, characterized in that: The armature assembly (300) comprises an armature part and an attraction part (330), wherein the attraction part (330) is arranged on a side of the armature part away from the electromagnetic assembly (400), the protective yoke (510) cooperates with the attraction part (330), and the attraction portion (512) can attract the attraction part (330) to drive the armature assembly (300) to move.

5. The load switch (10) according to claim 3 or 4, characterized in that: The armature component comprises a mounting portion (311), a first armature portion (312), a second armature portion (313) and a magnetic steel arranged on the mounting portion (311), and the protective yoke (510) is located on a side adjacent to the first armature portion (312).

6. The load switch (10) according to claim 5, characterized in that: The armature component also includes a rotating shaft (314), which is arranged on the shell, and the mounting portion (311) is rotatably arranged on the shell, and the attraction of the attraction portion (512) to the attraction member (330) located on one side of the center line (B) of the armature assembly (300) is greater than the attraction of the attraction member (330) located on the other side of the center line (B), and the center line (B) is a straight line that is perpendicular to the longitudinal center line of the first armature portion (312) and the second armature portion (313) and passes through the center of the rotating shaft (314).

7. The load switch (10) according to claim 5, characterized in that: A mating piece (320) is provided at one end of the first armature part (312) or an attracting piece (330) is provided at one side of the first armature part (312); the protective yoke (510) is located at one side of the first armature part (312) and cooperates with the mating piece (320) or the attracting piece (330); the attracting part (512) can attract the mating piece (320) or the attracting piece (330) and thereby drive the armature assembly (300) to move along the second direction.

8. The load switch (10) according to claim 2, characterized in that: When a short-circuit fault current occurs, the driving force generated by the protective yoke (510) on the armature assembly (300) is greater than the retaining force generated by the electromagnetic assembly (400) on the armature assembly (300).

9. The load switch (10) according to claim 2, characterized in that: The connecting conductor (520) is connected to the moving contact (200), the protective yoke (510), the armature assembly (300) and the electromagnetic assembly (400) are arranged in sequence along a third direction, and the armature assembly (300), the moving contact (200) / the stationary contact (100) are arranged in sequence along a fourth direction, and the third direction is perpendicular to the fourth direction.

10. The load switch (10) according to claim 1, characterized in that: The load switch (10) further comprises a connecting rod (600), wherein the moving contact (200) is rotatably arranged on the housing via a rotating shaft, one end of the connecting rod (600) is connected to the armature assembly (300), and the other end is connected to the moving contact (200), and the armature assembly (300) drives the connecting rod (600) to move, so as to drive the moving contact (200) to rotate around the rotating shaft and close or open the switch with the stationary contact (100).

11. An electric meter, characterized in that: A load switch (10) as claimed in any one of claims 1 to 10 is arranged in the housing of the electric meter.

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