Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a static contact assembly and a moving contact assembly which are arranged in a shell. A main shaft; a first operation arm; the utility model relates to an electromagnetic operating arm, which comprises a main shaft, a first connecting piece, a second operating arm and an electromagnetic assembly, one end of the first operating arm is arranged on the main shaft, the other end of the first operating arm is hinged with one end of the first connecting piece, the other end of the first connecting piece is hinged with a moving contact assembly, and the electromagnetic assembly comprises a static iron core with a coil and a moving iron core. In the process that the movable iron core and the static iron core are attracted, the movable iron core drives the main shaft to rotate through the second operating arm and drives the first connecting piece to act through the first operating arm, so that the movable contact assembly and the static contact assembly are closed. The utility model has the advantages of reducing accumulative errors in the action transmission process to ensure the reliability of closing, reducing the friction force of parts in the force transmission process, reducing the number of parts, simplifying the whole structure and prolonging the service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a switch. Background Art

[0002] The switch is an indispensable electrical protection device in the low-voltage distribution network. It plays the role of preventing fault current from damaging the load and ensuring the safety of electrical facilities. Specifically, when a large fault current caused by overload, short circuit or the like occurs in the circuit, it can cut off the large fault current.

[0003] Figure 1 It is a structural diagram of a switch in the prior art, including: a static contact assembly 1 and a moving contact assembly 2 of a structural system of a contact system arranged with a housing as a carrier in the use state, the closing or opening of the moving contact assembly 2 and the static contact assembly 1 is realized by rotation centered on the pivot support point 21 of the moving contact assembly. Specifically, when the moving contact assembly 2 rotates counterclockwise with the rotation center of the pivot support point 21 of the moving contact assembly and after rotating to the right position, the moving contact assembly 2 and the static contact assembly 1 are in contact, i.e. the switch is closed, otherwise they are disconnected, i.e. the switch is opened; a main shaft 3, the main shaft 3 is rotatably arranged around its main shaft fulcrum 31 as the center; a first operating arm 4 and a first connecting member 5, one end of the first operating arm 4 is fixedly arranged on the main shaft 3, and the other end is hinged to one end of the first connecting member 5 through the front end of the first operating arm hinge pin 41, and the other end of the first connecting member 5 is hinged to the moving contact assembly 2 through the connecting member hinge shaft, and the main shaft fulcrum 31 and the moving contact assembly pivot support 41 are connected to each other. The degree of freedom formed by the bearing point 21, the connecting member articulation axis and the first operating arm articulation pin 41 is a first operating system; the second connecting member 6 and the second operating arm 7, one end of the second connecting member 6 is articulated with one end of the second operating arm 7 through the connecting member articulation pin 61, and the other end of the second connecting member 6 is articulated with the moving iron core 82 of the electromagnetic assembly 8 composed of the static iron core 81 and the moving iron core 82 through the moving iron core articulation axis 62, the middle part of the second operating arm 7 is fixed on the main shaft 3, and the other end is articulated with the rear end of the first operating arm articulation pin 41, and the moving iron core 82 moves in a linear movement or a rotational manner with the pivot support axis 821 of the moving iron core 82 as the center. Under the operation of the static iron core 81 with the coil 811 of the electromagnetic assembly 8, the static iron core 81 attracts the moving iron core 82, so that the moving iron core 81 drives the main shaft 3 to rotate, and the degree of freedom formed by the second connecting member 6, the second operating arm 7 and the moving iron core 82 is a second operating system.

[0004] Since the effect of the electromagnetic component 8 of the switch of the above structure on the contact system can only be realized by the coordinated cooperation of the aforementioned first operating system and the second operating system, the increase in the size chain of the switch transmission mechanism will cause the following deficiencies: First, in the process of transmitting the action stroke, the error accumulation increases the discreteness of the rotation angle of the movable part, which affects the closing reliability of the switch. The so-called switch closing reliability refers to the ability of the switch to normally complete the closing action under specified conditions and within a specified time; second, in the process of force transmission, the increase in friction causes the force transmission efficiency of the electromagnetic component to the contact system to decrease; third, the increase in the number of components will lead to a complex structure and an increased volume of the operating mechanism, and will correspondingly reduce the overall life of the switch. Utility Model Content

[0005] The task of the utility model is to provide a switch which helps to reduce the accumulation of errors in the process of transmitting the action stroke so as to ensure the reliability of closing, helps to significantly reduce the friction of the components in the process of force transmission so as to improve the efficiency of the electromagnetic component in transmitting the force to the contact system, helps to reduce the number of parts so as to simplify the structure and correspondingly improve the overall life.

[0006] The utility model is completed as follows: a switch includes a static contact assembly and a moving contact assembly arranged in a shell; a main shaft; a first operating arm; a first connecting member, a second operating arm and an electromagnetic assembly. The moving contact assembly rotates counterclockwise or clockwise with the pivot support point of the moving contact assembly as the rotation center to contact or separate with the static contact assembly. The main shaft is rotatably arranged around its main shaft fulcrum. One end of the first operating arm is fixedly arranged on the main shaft, and the other end is hinged to one end of the first connecting member, and the other end of the first connecting member is hinged to the moving contact assembly. The electromagnetic assembly includes a static iron core with a coil and a moving iron core that is attracted or repelled relative to the static iron core. The moving iron core is connected to one end of the second operating arm, and the other end of the second operating arm is fixedly arranged on the main shaft. In the process of the moving iron core and the static iron core being attracted, the moving iron core drives the main shaft to rotate through the second operating arm and drives the first connecting member to move through the first operating arm to close the moving contact assembly and the static contact assembly.

[0007] In the utility model, the second operating arm is one or a pair, and when the second operating arm is one, one end of the second operating arm is hinged to the left side or right side of the moving iron core through the second operating arm hinge pin, and the other end of the second operating arm is fixed on the main shaft through the main shaft fixing hole opened on the second operating arm; when the second operating arm is a pair, one end of the pair of second operating arms is respectively hinged to the left side and right side of the moving iron core through the second operating arm hinge pin, and the other end is also fixed on the main shaft through the main shaft fixing hole.

[0008] In the utility model, a locking piece is fixedly arranged on the main shaft, and a locking pin matching groove for the locking pin of the jump lock to match is formed at one end of the locking piece and on the side facing away from the moving iron core.

[0009] In the utility model, when the moving iron core and the static iron core are attracted to each other so that the moving contact assembly and the static contact assembly are in a closed state, the locking pin is in a state of matching with the locking pin matching groove.

[0010] In the present utility model, the main shaft fulcrum and the pivot support point of the moving contact assembly are located on the same side of the first connecting member in the height direction.

[0011] In the utility model, the main shaft fulcrum and the pivot support point of the moving contact assembly are respectively located on both sides of the first connecting member in the height direction in a diagonal relationship with each other, and the main shaft is transferred from the bottom corresponding to the moving iron core to the top corresponding to the moving iron core.

[0012] In the utility model, the switch is a two-pole, three-pole or four-pole switch, and the number of the electromagnetic component is one.

[0013] In the utility model, the static iron core is composed of a plurality of U-shaped magnetic iron plates and / or E-shaped magnetic iron plates stacked together, and the moving iron core is composed of a plurality of rectangular magnetic iron plates stacked together.

[0014] The technical effect of the technical solution provided by the utility model is that: since the moving iron core is fixedly arranged on the second operating arm, the second operating arm is fixedly arranged on the main shaft, and during the attraction process of the moving iron core and the static iron core, the moving iron core can drive the main shaft to rotate through the second operating arm and drive the first connecting member to move through the first operating arm to close the moving contact assembly and the static contact assembly, it is helpful to significantly reduce the cumulative error in the process of action transmission to ensure the reliability of closing, it is beneficial to reduce the friction of components in the process of force transmission to improve the moving contact assembly of the structural system of the electromagnetic component to transmit force to the contact system, and it is beneficial to reduce the number of components to simplify the overall structure and improve the overall service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A structural diagram of a switch in the prior art;

[0016] Figure 2 It is a structural diagram of the first embodiment of the utility model;

[0017] Figure 3 for Figure 2 The schematic diagram of the cooperation between the locking member and the jump buckle shown;

[0018] Figure 4 for Figure 2 The structure diagram of the static iron core shown in the embodiment;

[0019] Figure 5 It is a schematic diagram of the operation process of the switch of the utility model from the open state to the closed state;

[0020] Figure 6 It is a schematic diagram of the operation process of the switch of the utility model from the closed state to the open state;

[0021] Figure 7 It is a schematic diagram of the second embodiment of the utility model. DETAILED DESCRIPTION Example 1

[0022] See also Figure 2 , showing a stationary contact assembly 1 and a moving contact assembly 2 arranged in a housing; a main shaft 3; a first operating arm 4; a first connecting member 5, a second operating arm 7 and an electromagnetic assembly 8. The moving contact assembly 2 rotates counterclockwise or clockwise with the moving contact assembly pivot support point 21 as the rotation center, that is, the moving contact assembly 2 rotates around the moving contact assembly pivot support point 21 (also referred to as a "fulcrum") to contact or separate from the stationary contact assembly 1. The main shaft 3 is rotatably arranged around its main shaft fulcrum 31 as the rotation center. One end of the first operating arm 4 is fixedly arranged on the main shaft 3, and the other end is connected to one end of the first connecting member 5 ( Figure 2 The right end of the position shown in the figure) is hinged, and the other end of the first connecting member 5 ( Figure 2 The left end of the position state shown in the figure is hinged to the moving contact assembly 2 through the connecting piece hinge shaft 51, and the electromagnetic assembly 8 includes a static iron core 81 with a coil 811 and a moving iron core 82 that is attracted or repelled relative to the static iron core 81.

[0023] The technical key points of the technical solution provided by the utility model are: the aforementioned moving iron core 82 is connected to one end of the second operating arm 7, and the second operating arm 7 is fixedly arranged on the aforementioned main shaft 3, and in the process of the moving iron core 82 and the static iron core 81 being attracted, the moving iron core 82 drives the main shaft 3 to rotate through the second operating arm 7 and drives the first connecting member 5 to move through the aforementioned first operating arm 4 to close the aforementioned moving contact assembly 2 and the static contact assembly 1.

[0024] According to common sense, the switch also includes an arc extinguishing system which is not shown in the figure and is located in the housing (switch housing) and generally corresponds to the upper part of the contact system. Figure 2It can be seen that the connection relationship between the main shaft fulcrum 31 of the main shaft 3, the movable contact assembly pivot support point 21 of the movable contact assembly 2, the hinge point of the first operating arm hinge pin shaft 41 of the first operating arm 4 and the hinge point of the connecting member hinge shaft 51 forms a four-bar linkage mechanism. When the movable contact assembly 2 contacts the static contact assembly 1, the switch is closed, and vice versa. It can be seen that compared with the existing technology, for example, compared with Figure 1 Compared with the two sets of connecting rod mechanisms of the switch of the structure shown, the present invention only needs one set of four-connecting rod mechanisms.

[0025] In this embodiment, a pair of the second operating arms 7 is used for each movable iron core 82, and one end of the pair of second operating arms 7 ( Figure 2 The upper end of the second operating arm 7 (in the state shown) is respectively hinged to the left side and the right side of the moving iron core 82 through the second operating arm hinge pin 71, and the other end of the second operating arm 7 ( Figure 2 The lower end of the second operating arm 7 in the state shown in the figure is fixedly set on the aforementioned main shaft 3 through the main shaft fixing hole 72 opened on the second operating arm 7. Of course, if only one second operating arm 7 is used relative to one moving iron core 82, then it is also possible, specifically: one end of the second operating arm 7 is hinged to the left side or right side of the moving iron core 82 through the second operating arm hinge pin 71, and the other end of the second operating arm 7 is fixedly set on the main shaft 3 through the aforementioned main shaft fixing hole 72. Therefore, whether the second operating arm 7 is a double arm (a pair) or a single arm (one), it should be regarded as the technical connotation scope disclosed by the present utility model.

[0026] See also Figure 3 A locking member 9 is fixedly disposed on the aforementioned main shaft 3, and a locking pin matching groove 91 for matching the locking pin 101 of the trip button 10 is formed at one end of the locking member 9 and on the side facing away from the aforementioned moving iron core 82. When the aforementioned moving iron core 82 and the aforementioned static iron core 81 are attracted to make the aforementioned moving contact assembly 2 and the static contact assembly 1 in the closed state, the aforementioned locking pin 101 is in a state of matching with the locking pin matching groove 91.

[0027] by Figure 2 For example, the embodiment diagram of the present invention discloses a two-pole switch, so it has two or two groups of contact systems, each of which has a stationary contact assembly 1 and a moving contact assembly 2, and each of which has a first operating arm 4 and a pair of second operating arms 7 (also called "driving arms") symmetrically located on both sides of a locking member 9 (also called "locking rod"). Figure 2 and Figure 5 As shown, the jump buckle 10 is also provided with a limiting surface 102 corresponding to the traction rod 20 .

[0028] In this embodiment, and by Figure 2As shown, the spindle fulcrum 31 and the movable contact assembly pivot support point 21 are located on the same side of the first connecting member 5 in the height direction. In this state, the spindle 3 substantially corresponds to the lower side of the movable iron core 82.

[0029] In this embodiment, although the switch provided is the two-pole switch mentioned above, it does not exclude three-pole or four-pole switches, and the number of the aforementioned electromagnetic components 8 is one, that is, there is no need to increase the number of electromagnetic components 8 accordingly due to increasing the number of contact systems, that is, increasing the number of switch poles.

[0030] See also Figure 4 In this embodiment, the aforementioned static iron core 81 is composed of a plurality of U-shaped magnetic iron plates and / or E-shaped magnetic iron plates stacked together. The aforementioned moving iron core 82 is composed of a plurality of rectangular magnetic iron plates stacked together. More specifically, the middle of the aforementioned static iron core 81 is an E-shaped iron plate 812, and the two sides are U-shaped iron plates 813. The E-shaped iron plate 812 has one more middle protrusion 814 than the U-shaped iron plate 813, and the aforementioned middle protrusion 814 is arranged in the skeleton of the coil 81. The aforementioned moving iron core 82 is arranged on the aforementioned main shaft 3 through the second operating arm 7, and the main shaft 3 is driven to rotate by the attraction of the static iron core 81 and the moving iron core 82, and finally the switch is closed. The applicant needs to explain that the structure of the electromagnetic assembly 8 is not limited to this. For example, a screw-type structure is also possible. Since the specific structure and working mechanism of the screw-type electromagnet are well known, the applicant will not repeat them.

[0031] See also Figure 5 The applicant describes the closing process. After the coil 811 is energized, an electromagnetic attraction is generated on the moving iron core 82. The moving iron core 82 drives the main shaft 3 to rotate counterclockwise by overcoming the counter torque of the opening spring 30, and then drives the first connecting member 5 through the first operating arm 4 fixed on the main shaft 3 to make the moving contact assembly 2 rotate toward the static contact assembly 1, and store energy for the opening spring 30. When the moving contact assembly 2 contacts the static contact assembly 1, the crimping spring 22 arranged in the moving contact assembly 2 begins to further store energy. When the closing setting position is reached, the locking pin 101 of the trip latch 10 and the groove 91 of the locking rod 9 are abutted against the limit, and the limit surface 102 is further limited by the traction rod 20. After the electromagnetic attraction disappears, the contact system still remains in the closing position.

[0032] See also Figure 6 The applicant describes the opening process, applies a force to the traction rod 20, and after rotation, releases the limit on the trip button 10. Under the action of the crimping spring 22 and the opening spring 30, the main shaft 3 rotates clockwise, driving the moving contact assembly 2 to separate from the static contact assembly 1, realizing the opening, and at the same time, the moving iron core 82 is reset to the maximum open position. Example 2

[0033] See also Figure 7 The spindle fulcrum 31 and the movable contact assembly pivot support point 21 are respectively located on both sides of the first connecting member 5 in the height direction in a state of forming a diagonal relationship with each other, and the spindle 3 is transferred from the lower side corresponding to the movable iron core 82 to the upper side corresponding to the movable iron core 82, and the spindle fulcrum 31 is rotatably supported on the upper part of the housing. The rest is the same as the description of the first embodiment.

[0034] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A switch, comprising a stationary contact assembly (1) and a moving contact assembly (2) arranged in a housing; a main shaft (3); a first operating arm (4); a first connecting member (5), a second operating arm (7) and an electromagnetic assembly (8); the moving contact assembly (2) rotates counterclockwise or clockwise with the moving contact assembly pivot support point (21) as the rotation center to contact or separate with the stationary contact assembly (1); the main shaft (3) is rotatably arranged around its main shaft fulcrum (31) as the center; one end of the first operating arm (4) is fixedly arranged on the main shaft (3), and the other end is hinged to one end of the first connecting member (5), and the other end of the first connecting member (5) is hinged to the moving contact assembly (2); the electromagnetic assembly (8) comprises a stationary iron core (81) having a coil (811) and a moving iron core (82) that is attracted or repelled relative to the stationary iron core (81); and characterized in that: The moving iron core (82) is connected to one end of the second operating arm (7), and the other end of the second operating arm (7) is fixedly arranged on the main shaft (3), and during the process of the moving iron core (82) and the static iron core (81) being attracted, the moving iron core (82) drives the main shaft (3) to rotate through the second operating arm (7) and drives the first connecting member (5) to move through the first operating arm (4), so that the moving contact assembly (2) and the static contact assembly (1) are closed.

2. A switch according to claim 1, characterized in that: The second operating arm (7) is provided in one or a pair, and when there is one second operating arm (7), one end of the second operating arm (7) is hinged to the left side or right side of the moving iron core (82) through a second operating arm hinge pin (71), and the other end of the second operating arm (7) is fixedly arranged on the main shaft (3) through a main shaft fixing hole (72) provided on the second operating arm (7); when there is a pair of second operating arms (7), one end of the pair of second operating arms (7) is respectively hinged to the left side and right side of the moving iron core (82) through a second operating arm hinge pin (71), and the other end is also fixedly arranged on the main shaft (3) through the main shaft fixing hole (72).

3. A switch according to claim 1, characterized in that: A locking member (9) is fixedly arranged on the main shaft (3), and a locking pin matching groove (91) for matching with a locking pin (101) of a jumper (10) is formed at one end of the locking member (9) and on the side facing away from the moving iron core (82).

4. A switch according to claim 3, characterized in that: When the moving iron core (82) and the stationary iron core (81) are attracted to each other so that the moving contact assembly (2) and the stationary contact assembly (1) are in a closed state, the locking pin (101) is in a state of being matched with the locking pin matching groove (91).

5. A switch according to claim 1, characterized in that: The main shaft fulcrum (31) and the movable contact assembly pivot support point (21) are located on the same side of the first connecting member (5) in the height direction.

6. A switch according to claim 1, characterized in that: The main shaft fulcrum (31) and the movable contact assembly pivot support point (21) are respectively located on both sides of the first connecting member (5) in the height direction in a state of forming a diagonal relationship with each other, and the main shaft (3) is transferred from the bottom corresponding to the movable iron core (82) to the top corresponding to the movable iron core (82).

7. A switch according to claim 1, characterized in that: The switch is a two-pole, three-pole or four-pole switch, and the number of the electromagnetic component (8) is one.

8. A switch according to claim 1 or 4, characterized in that: The static iron core (81) is composed of a plurality of U-shaped magnetic iron plates and / or E-shaped magnetic iron plates stacked together, and the moving iron core (82) is composed of a plurality of rectangular magnetic iron plates stacked together.

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