Magnetic system, load switch and electricity meter

Abstract

The utility model provides a magnetic system, a load switch and an electricity meter, and relates to the technical field of low-voltage electric appliances, the magnetic system comprises a magnetic assembly and a magnetic shielding structure, the magnetic assembly comprises a driving shaft, a static iron core, a movable iron core which sleeves the driving shaft and can move along a first direction, and a permanent magnet which is used for locking the movable iron core to realize steady-state balance of the magnetic assembly, the magnetic shielding structures are arranged on all side faces of the magnetic assembly so as to surround the magnetic assembly. Each side surface of the magnetic assembly is surrounded by the magnetic shielding structure, so that the magnetic assembly is effectively sealed in the magnetic shielding structure, the sealing effect is good, the magnetic assembly can be effectively prevented from being interfered by an external magnetic field, the problem that the action of an internal magnetic system is influenced by the interference of the external magnetic field of the magnetic system is solved, and the contact system can be normally opened and closed; moreover, the magnetic shielding structure is matched with the magnetic assembly, the size of the magnetic shielding structure is small, the space is not occupied, and the overall compact layout of the load switch is facilitated.

Description

Technical Field

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

[0002] The load switch is a switch between the circuit breaker and the isolating switch. It has a simple arc extinguishing device and can cut off the rated load current and a certain overload current. A magnetic system is set inside the load switch. Through the cooperation of the static iron core and the moving iron core of the magnetic system, the moving iron core moves to drive the contact system to open and close. At present, the magnetic system inside the load switch is easily disturbed by the external magnetic field, which affects the action of the internal magnetic system, and then affects the normal function of the load switch contact system to open and close. Utility Model Content

[0003] The purpose of the present application is to provide a magnetic system, a load switch and an electric meter to address the deficiencies in the above-mentioned prior art, which have good sealing effects and can effectively prevent the magnetic system from being easily disturbed by external magnetic fields and affecting the operation of the internal magnetic system.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0005] According to one aspect of an embodiment of the present application, a magnetic system is provided, including a magnetic assembly and a magnetic shielding structure, wherein the magnetic assembly includes a drive shaft, a static iron core, a moving iron core sleeved on the drive shaft and movable along a first direction, and a permanent magnet for locking the moving iron core to achieve steady-state balance of the magnetic assembly, and the magnetic shielding structure is arranged on each side of the magnetic assembly to surround the magnetic assembly.

[0006] Optionally, the magnetic shielding structure is a rectangular structure with a hollow interior, and the magnetic component is located inside the rectangular structure.

[0007] Optionally, the magnetic shielding structure includes a first shielding cover and a second shielding cover, and the first shielding cover and the second shielding cover are nested with each other.

[0008] Optionally, the permanent magnet is sleeved on the outer circumference of the moving iron core, and the permanent magnet includes a first permanent magnet and a second permanent magnet. The first permanent magnet and the second permanent magnet are spaced apart along the second direction, and the two side walls of the magnetic shielding structure extending along the third direction respectively form air gaps, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0009] Optionally, the static iron core includes a first static iron core and a second static iron core, and the direction of the air gap is extended along the second direction.

[0010] Optionally, the sum of the air gaps on each of the side walls extending along the third direction on the magnetic shielding structure is greater than the total movement stroke of the moving iron core.

[0011] Optionally, along the first direction, the air gap formed by each of the side walls includes an upper air gap located at an upper end of the side wall, and a lower air gap located at a lower end of the side wall.

[0012] Optionally, a skeleton is further included, and the moving iron core, the static iron core and the permanent magnet are all located inside the skeleton.

[0013] An embodiment of the present application also provides a load switch, comprising the above-mentioned magnetic system.

[0014] An embodiment of the present application also provides an electric meter, comprising the above-mentioned load switch.

[0015] The beneficial effects of this application include:

[0016] The present application provides a magnetic system, a load switch and an electric meter, including a magnetic assembly and a magnetic shielding structure, wherein the magnetic assembly includes a drive shaft, a static iron core, a moving iron core sleeved on the drive shaft and movable in a first direction, and a permanent magnet for locking the moving iron core to achieve steady-state balance of the magnetic assembly, and the magnetic shielding structure is arranged on each side of the magnetic assembly to surround the magnetic assembly. Each side of the magnetic assembly is surrounded by the magnetic shielding structure to effectively enclose the magnetic assembly in the magnetic shielding structure, and the enclosing effect is good, which can effectively prevent the magnetic assembly from being disturbed by the external magnetic field, solve the problem that the magnetic system is easily disturbed by the external magnetic field and affects the action of the internal magnetic system, so that the contact system can open and close normally; and the magnetic shielding structure is adapted to the magnetic assembly, and the magnetic shielding structure is small in size and does not occupy space, which is conducive to the overall compact layout of the load switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application 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 paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a magnetic system provided in an embodiment of the present application;

[0019] Figure 2a One of the exploded structural schematic diagrams of a magnetic system provided in an embodiment of the present application;

[0020] Figure 2b A schematic structural diagram of a magnetic shielding structure of a magnetic system provided in an embodiment of the present application;

[0021] Figure 3 A second exploded structural diagram of a magnetic system provided in an embodiment of the present application;

[0022] Figure 4 One of the magnetic circuit schematic diagrams of a magnetic system provided in an embodiment of the present application;

[0023] Figure 5 A second magnetic circuit schematic diagram of a magnetic system provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of a load switch provided in an embodiment of the present application.

[0025] Icons: 10-magnetic system; 11-magnetic assembly; 110-drive shaft; 111a-first yoke; 111b-second yoke; 112a-first coil; 112b-second coil; 113a-first static iron core; 113b-second static iron core; 115a-first permanent magnet; 115b-second permanent magnet; 116-moving iron core; 117-guide cylinder; 118-skeleton; 12-magnetic shielding structure; 121-first shielding cover; 122-second shielding cover; 122a-front side wall; 122b-rear side wall; 131-upper air gap; 132-lower air gap; 20-contact system. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of 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 scope of protection of the present application.

[0028] 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.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In one aspect of the embodiment of the present application, please refer to Figure 1 , a magnetic system 10 is provided, including a magnetic component 11 and a magnetic shielding structure 12 , wherein the magnetic shielding structure 12 is arranged on each side of the magnetic component 11 to surround the magnetic component 11 .

[0033] As an important component of the load switch, the magnetic component 11 can drive the contact system 20 to open and close the switch; the outer periphery of the magnetic component 11 is surrounded by a magnetic shielding structure 12, and the magnetic shielding structure 12 encloses the magnetic component 11 inside, with a good sealing effect.

[0034] For example, in the present application, the outer shape of the magnetic component 11 is a rectangular structure with six faces. Accordingly, the magnetic shielding structure 12 is a rectangular structure with a hollow interior. The magnetic component 11 is located inside the rectangular structure of the magnetic shielding structure 12 to fully wrap the six faces of the magnetic component 11.

[0035] The magnetic shielding structure 12 is configured as a rectangular structure matching the magnetic assembly 11 , which can effectively seal the magnetic assembly 11 while also making the volume of the magnetic shielding structure 12 small.

[0036] Therefore, in the magnetic system 10 provided in the embodiment of the present application, each side of the magnetic component 11 is surrounded by the magnetic shielding structure 12 to effectively enclose the magnetic component 11 in the magnetic shielding structure 12. The sealing effect is good, and the magnetic component 11 can be effectively prevented from being disturbed by the external magnetic field, thereby solving the problem that the magnetic system 10 is easily disturbed by the external magnetic field and affecting the action of the internal magnetic system, so that the contact system 20 can open and close normally; and the magnetic shielding structure 12 is adapted to the magnetic component 11, and the magnetic shielding structure 12 is small in size and does not take up space, which is conducive to the overall compact layout of the load switch.

[0037] Furthermore, the magnetic shielding structure 12 includes a first shielding cover 121 and a second shielding cover 122 , and the first shielding cover 121 and the second shielding cover 122 are nested with each other.

[0038] For example, Figure 2a As shown, the first shielding cover 121 and the second shielding cover 122 are both U-shaped structures. The first shielding cover 121 has three mutually perpendicular surfaces, and the second shielding cover 122 also has three mutually perpendicular surfaces. The three surfaces of the second shielding cover 122 just fit in the three hollow directions of the first shielding cover 121, and the three surfaces of the first shielding cover 121 just fit in the three hollow directions of the second shielding cover 122. After the first shielding cover 121 and the second shielding cover 122 are mutually nested, the overall combined magnetic shielding structure 12 forms a closed rectangular structure, which can enclose the magnetic component 11.

[0039] Of course, the first shielding cover 121 and the second shielding cover 122 may also be other shapes, not limited to the above-mentioned U-shape, as long as the combination of the two can form a closed structure; it is also possible that the shielding cover is not limited to two, there may be one or more, as long as they can form a closed structure of the closed magnetic component 11, and the present application does not make any specific limitations on this.

[0040] The magnetic assembly 11 includes a driving shaft 110 , a static iron core, a moving iron core 116 sleeved on the driving shaft 110 and movable along a first direction F1 , and a permanent magnet for locking the moving iron core 116 to achieve steady-state balance of the magnetic assembly 11 .

[0041] Among them, the static iron core includes a first static iron core 113a and a second static iron core 113b, the moving iron core 116 is located between the first static iron core 113a and the second static iron core 113b, and also includes a permanent magnet sleeved on the outer periphery of the moving iron core 116, the permanent magnet includes a first permanent magnet 115a and a second permanent magnet 115b arranged oppositely, and the first permanent magnet 115a and the second permanent magnet 115b are arranged at intervals along the second direction F2.

[0042] Two side walls of the magnetic shielding structure 12 extending along the third direction F3 form air gaps respectively. The first direction F1 , the second direction F2 , and the third direction F3 are perpendicular to each other. The setting of the air gaps is limited to prevent the magnetic component 11 from generating a magnetic short circuit.

[0043] For example, a permanent magnet is arranged on the outer periphery of the moving iron core 116, and the permanent magnet provides a magnetic field for maintaining the moving iron core 116 and a magnetic field for driving the moving iron core 116 to move after the moving iron core 116 moves halfway, so as to drive the moving iron core 116 to approach or move away from the stationary iron core. When the moving iron core 116 moves downward, it can push the contact system 20 below, so as to drive the contact system 20 to complete the opening and closing of the switch.

[0044] In this application, if Figure 2b As shown, the second shielding cover 122 of the magnetic shielding structure 12 is disposed on two side walls ( Figure 3 The front side wall 122a and the rear side wall 122b) in the middle form air gaps respectively, and the direction of the air gaps is extended along the second direction F2. The air gaps are the formed gaps. The air gaps can prevent the magnetic component 11 from generating a magnetic short circuit, so that the direction of the magnetic circuit is formed in the expected direction.

[0045] The permanent magnet also has a working surface. The curved surface of the permanent magnet wrapping the moving iron core 116 is the working surface. The working surface of the permanent magnet is perpendicular to the direction of the permanent magnet magnetic field.

[0046] The permanent magnet is located in the middle of the magnetic shielding structure 12, in the moving direction of the moving iron core 116 ( Figure 3 In the up-down direction, ie, the first direction F1), the air gap formed by each side wall includes an upper air gap 131 located at the upper end of the side wall, and a lower air gap 132 located at the lower end of the side wall.

[0047] The moving iron core 116 moves up and down. In the up and down direction of the moving iron core 116, taking the front side wall 122a of the second shielding cover 122 as an example, Figure 4 As shown, a gap is formed between the upper end of the front side wall 122a of the second shielding cover 122 and the top of the magnetic assembly 11 as an upper air gap 131, and a gap is formed between the lower end of the front side wall 122a of the second shielding cover 122 and the bottom of the magnetic assembly 11 as a lower air gap 132, so that when the magnetic circuit encounters the upper air gap 131 in the direction of the front side wall 122a of the second shielding cover 122, the magnetic circuit cannot move upward and must return to the left side ( Figure 4 The upper left dotted magnetic circuit) or the right side ( Figure 4 The dotted magnetic loop on the upper right side) then moves downward. When it encounters the lower air gap 132, the magnetic loop cannot move downward and has to return to the left side ( Figure 5 The lower right dotted magnetic circuit) or the right side ( Figure 5 The dotted magnetic circuit on the lower left side) moves upward to form a loop to prevent magnetic short circuit.

[0048] In the present application, the first static iron core 113a and the second static iron core 113b are respectively provided on the upper and lower sides of the moving iron core 116. When the moving iron core 116 moves toward the first static iron core 113a above, the magnetic circuit of the permanent magnet located on the outer periphery of the moving iron core 116 is as follows: Figure 4 As shown by the dotted lines, they are respectively located above the magnetic assembly 11, the left magnetic circuit corresponds to the second permanent magnet 115b on the left, and the right magnetic circuit corresponds to the first permanent magnet 115a on the right; when encountering the upper air gap 131 and the lower air gap 132, they are blocked from moving toward the left or right.

[0049] When the moving iron core 116 moves toward the second static iron core 113b below, the magnetic circuit of the permanent magnet located on the outer periphery of the moving iron core 116 is as follows. Figure 5 As shown by the dotted lines, they are respectively located below the magnetic assembly 11, the left magnetic circuit corresponds to the second permanent magnet 115b on the left, and the right magnetic circuit corresponds to the first permanent magnet 115a on the right; when encountering the upper air gap 131 and the lower air gap 132, they are blocked from moving toward the left or right.

[0050] The rear side wall 122 b of the second shielding cover 122 also forms a similar upper air gap 131 and a lower air gap 132 , as described above, which will not be described again.

[0051] The sum of all the air gaps on each side wall of the second shielding cover 122 extending along the third direction F3 on the magnetic shielding structure is greater than the total movement stroke of the moving iron core 116. For example, the front side wall 122a of the second shielding cover 122 forms an upper air gap 131 and a lower air gap 132, and the rear side wall 122b of the second shielding cover 122 also forms a similar upper air gap 131 and a lower air gap 132. Then, the front side wall 122a and the rear side wall 122b of the second shielding cover 122 each form two air gaps, and the sum of the two air gaps on the front side wall 122a of the second shielding cover 122 (the sum of the upper air gap 131 and the lower air gap 132) is greater than the total movement stroke of the moving iron core 116. Similarly, the sum of the two air gaps on the rear side wall 122b of the second shielding cover 122 (the sum of the upper air gap 131 and the lower air gap 132) is greater than the total movement stroke of the moving iron core 116, so as to meet the requirement of preventing magnetic short circuit.

[0052] The sum of the movement stroke of the moving iron core 116 toward the first stationary iron core 113 a and the movement stroke of the moving iron core 116 toward the second stationary iron core 113 b is the total movement stroke of the moving iron core 116 .

[0053] Correspondingly, the magnetic assembly 11 includes a skeleton 118 , and the moving iron core 116 , the first static iron core 113 a , the second static iron core 113 b , the first permanent magnet 115 a and the second permanent magnet 115 b are all located in the skeleton 118 .

[0054] Figure 3Also disclosed are a first magnetic yoke 111a and a first coil 112a corresponding to the first static iron core 113a, and a second magnetic yoke 111b and a second coil 112b corresponding to the second static iron core 113b. The specific functions are referred to the prior art and are not described here.

[0055] The drive shaft 110 passes through the entire magnetic assembly 11, and a guide cylinder 117 is set at the end of the drive shaft 110 near the first static iron core 113a. The guide cylinder 117 is used to guide the drive shaft 110 and the moving iron core 116, so that the drive shaft 110 can be guided to extend into the first static iron core 113a to avoid the moving iron core 116 from moving and deviating, and contacting with the permanent magnet to cause jamming.

[0056] On this basis, please refer to Figure 6 As shown, an embodiment of the present application also discloses a load switch, including a magnetic system 10 as any one of the above items, and a contact system 20 is also arranged in the load switch. The moving iron core 116 of the magnetic system 10 moves downward to drive the driving shaft 110 to push the contact system 20 to achieve closing, and the contact system 20 achieves opening through its contact spring.

[0057] On the other hand, an electric meter is also disclosed, comprising a load switch as described above.

[0058] The load switch and the electric meter have the same structure and beneficial effects as the magnetic system 10 in the above embodiment. The structure and beneficial effects of the magnetic system 10 have been described in detail in the above embodiment, and will not be repeated here.

[0059] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic system, characterized in that: It includes a magnetic assembly and a magnetic shielding structure. The magnetic assembly includes a driving shaft, a static iron core, a moving iron core sleeved on the driving shaft and movable along a first direction, and a permanent magnet used to lock the moving iron core to achieve steady-state balance of the magnetic assembly. The magnetic shielding structure is arranged on each side of the magnetic assembly to surround the magnetic assembly.

2. The magnetic system according to claim 1, characterized in that The magnetic shielding structure is a rectangular structure with a hollow interior, and the magnetic component is located inside the rectangular structure.

3. The magnetic system according to claim 1, characterized in that The magnetic shielding structure comprises a first shielding cover and a second shielding cover, wherein the first shielding cover and the second shielding cover are sleeved with each other.

4. The magnetic system according to any one of claims 1 to 3, characterized in that The permanent magnet is sleeved on the outer circumference of the moving iron core, and the permanent magnet includes a first permanent magnet and a second permanent magnet. The first permanent magnet and the second permanent magnet are spaced apart along the second direction. The two side walls of the magnetic shielding structure extending along the third direction respectively form air gaps. The first direction, the second direction, and the third direction are perpendicular to each other.

5. The magnetic system according to claim 4, characterized in that The static iron core includes a first static iron core and a second static iron core, and the air gap is extended along the second direction.

6. The magnetic system according to claim 4, characterized in that The sum of the air gaps on each of the side walls extending along the third direction on the magnetic shielding structure is greater than the total movement stroke of the moving iron core.

7. The magnetic system according to claim 5 or 6, characterized in that Along the first direction, the air gap formed by each of the side walls includes an upper air gap located at an upper end of the side wall, and a lower air gap located at a lower end of the side wall.

8. The magnetic system according to any one of claims 1 to 3, characterized in that It also includes a frame, and the moving iron core, the static iron core and the permanent magnet are all located inside the frame.

9. A load switch, characterized in that: Comprising the magnetic system according to any one of claims 1 to 8.

10. An electric meter, characterized in that: Including the load switch as described in claim 9.

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