Switch unit

Abstract

The invention discloses a switch unit, which comprises a shell, a moving contact assembly, a static contact assembly and a contact driving mechanism, and is characterized in that the moving contact assembly comprises a moving contact and a supporting piece; the shell is provided with a sliding rail; the supporting piece comprises a sliding block which is in sliding connection with the sliding rail, a contact connecting part which is fixedly connected with the moving contact, and a transmission connecting part which is in transmission connection with a contact driving mechanism; the sliding rail extends from the position close to the contact driving mechanism to the direction of the static contact assembly and is close to the static contact assembly, and the moving contact can be driven by the contact driving mechanism to slide along the sliding rail to be in contact with or separated from the static contact. In the switch unit provided by the invention, the moving contact moves in a sliding way of the sliding rail, so that the occupied moving space of the moving contact is smaller, a larger space can be reserved for arranging the arc extinguish chamber, and meanwhile, the size of a product can be reduced.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a switch unit. Background Art

[0002] The rotary disconnector is usually composed of an operating mechanism unit and several stacked switch units. The switch unit includes a unit housing, each of which is equipped with a pair of stationary contact assemblies and a rotatable moving contact module. The moving contact module is fixed on the rotating shaft, and the operating mechanism unit can operate the rotating shaft to rotate, thereby closing or opening the moving and stationary contacts.

[0003] The traditional moving contact moves in a circular motion, so it is necessary to leave space for the moving contact in the housing. This results in an increase in the housing structure and compresses the space available for the arc extinguishing chamber, which limits the arc extinguishing effect of the traditional disconnector and makes the product volume larger. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a switch unit.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A switch unit comprises a shell, a moving contact assembly, a stationary contact assembly, and a contact driving mechanism, wherein the moving contact assembly comprises: a moving contact and a support member; the shell is provided with a slide rail; the support member comprises a slider slidably connected to the slide rail, a contact connecting portion fixedly connected to the moving contact, and a transmission connecting portion for transmission connection with the contact driving mechanism; the slide rail extends from a position adjacent to the contact driving mechanism toward the stationary contact assembly and is adjacent to the stationary contact assembly, and the moving contact can slide along the slide rail under the drive of the contact driving mechanism to contact or separate from the stationary contact.

[0007] Preferably, the slide rail is formed by two parallel retaining walls arranged on the bottom surface of the shell.

[0008] Preferably, the contact connecting portion includes a connecting shaft and a key protruding from the outer periphery of the connecting shaft, and the moving contact is correspondingly provided with a support member connecting portion, the support member connecting portion includes a connecting hole and a keyway located on the side wall of the connecting hole, the connecting shaft is arranged in the connecting hole, and the key is inserted into the hole.

[0009] Preferably, a slide rail surface is provided on the top of the retaining wall, and the first moving contact piece is provided with a first supporting surface. The first supporting surface is mounted on the slide rail surface and simultaneously forms contact with the upper limit surface of the slider to limit each other, and the moving contact also slides on the slide rail surface through the first supporting surface.

[0010] Preferably, the second movable contact piece is provided with a second supporting surface facing opposite to the first supporting surface, and is used for cooperating with the first supporting surface to form upper and lower limit positions for the first movable contact piece and the second movable contact piece.

[0011] Preferably, the slide rail comprises: a first slide rail extending from the middle area of ​​the shell to the first side edge of the shell and a second slide rail extending from the middle area of ​​the shell to the second side edge of the shell; the first side and the second side are two opposite sides.

[0012] Preferably, the moving contact includes: a first moving contact piece and a second moving contact piece, the first moving contact piece and the second moving contact piece are relatively assembled and arranged, and the two ends of the first moving contact piece and the second moving contact piece are respectively provided with bending portions relatively bent outward, and the bending portions respectively form opening structures that contact the contact portions of the stationary contact.

[0013] Preferably, the opening structures of the first moving contact piece and the second moving contact piece are respectively provided with guide curved edges facing the direction of the stationary contact assembly.

[0014] Preferably, the outer end edge of the bent portion is also provided with an arc-striking edge and an arc-striking tip, the arc-striking edge is inclined relative to the movement path of the moving contact, the arc-striking tip of the moving contact is arranged close to one side of the arc extinguishing chamber, the first end of the arc-striking edge is at a greater distance from the arc extinguishing chamber than its second end, and the arc-striking tip is arranged at the second end of the arc-striking edge.

[0015] Preferably, both ends of the first moving contact piece and the second moving contact piece are provided with the opening structure, the arc-striking edge and the arc-striking tip, the line connecting the two ends of the first moving contact piece and the second moving contact piece is perpendicular to their movement direction, and arc extinguishing chambers are provided on the outer sides of the arc-striking tips at both ends of the first moving contact piece and the second moving contact piece.

[0016] In the switch unit of the present invention, the moving contact moves by sliding on a slide rail, and the slide rail extends from a position adjacent to the contact driving mechanism toward the direction of the stationary contact assembly and is adjacent to the stationary contact assembly, thereby making the movement space occupied by the moving contact smaller, leaving more space for setting up the arc extinguishing chamber, and also facilitating the reduction of the product volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a top view of the switch unit of the present invention;

[0018] Figure 2 It is a schematic diagram of the housing structure of the switch unit of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the moving contact of the present invention;

[0020] Figure 4 is a schematic diagram of the structure of the moving contact of the present invention (from another perspective);

[0021] Figure 5 It is a schematic diagram of the structure of the movable contact piece of the present invention;

[0022] Figure 6 It is a schematic diagram of the support structure of the present invention.

[0023] 6 Rotating frame 7 transmission shaft 10 case 20 Interrupter 31 First stationary contact 32 Second static contact 33 The third static contact 34 Fourth static contact 40 Moving contact 41 First moving contact 42 Second moving contact 401 Support connection part 4011 Connection hole 4012 keyway 402 Opening structure 403 Opening structure 411 First support surface 421 Second support surface 413 Bending Department 414 Bending Department 4131 Guide flange 4141 Guide flange 4132 Arc starting edge 4142 Arc striking edge 4133 Arc starting tip 4143 Arc starting tip 5a First connecting rod 5b Second connecting rod 103 Slide rails 103a First slide rail 103b Second slide rail 1030 Retaining Wall 1031 Slide surface 80 Support 801 Transmission connection 802 slider 803 Contact connection 8031 Connecting shaft 8031 Connecting shaft 8032 key DETAILED DESCRIPTION

[0024] The following is a further description of the specific implementation of the rotary isolating switch of the present invention in conjunction with the embodiments given in the accompanying drawings. The rotary isolating switch of the present invention is not limited to the description of the following embodiments.

[0025] A rotary isolating switch usually includes an operating unit and at least one switch unit, which are stacked together. The switch unit includes a moving contact assembly and a stationary contact assembly. The operating unit is provided with an output shaft, which is connected to a contact drive mechanism of the switch unit, and the contact drive mechanisms of adjacent switch units are connected. The output shaft of the operating unit rotates to drive the contact drive mechanism of the switch unit, thereby realizing the closing and opening of the switch unit.

[0026] like Figure 1 and Figure 2 The switch unit provided in this embodiment is shown, which includes a housing 10, a moving contact assembly, a stationary contact assembly, a contact drive mechanism and an arc extinguishing chamber 20. The moving contact assembly includes: a moving contact 40 and a support member 80; the housing 10 is provided with a slide rail 103; the support member 80 includes a slider 802 slidably connected to the slide rail 103, a contact connection portion 803 fixedly connected to the moving contact 40, and a transmission connection portion 801 for transmission connection with the contact drive mechanism; the slide rail 103 extends from a position adjacent to the contact drive mechanism toward the direction of the stationary contact assembly and is adjacent to the stationary contact assembly, and the moving contact 40 can move along the slide rail 103 under the drive of the contact drive mechanism to contact or separate with the stationary contact.

[0027] In this embodiment, the slide rail 103 is formed by two parallel retaining walls 1030 arranged on the bottom surface of the housing 10. The two retaining walls 1030 can provide a limit for the two sides of the slider 802, that is, the sliding track of the moving contact is pre-set, and the moving contact 40 can slide linearly along the slide rail 103 under the drive of the contact driving mechanism. The retaining wall 1030 can be a raised rib or a side wall of a slide groove. Of course, if a retaining wall structure is adopted, a slide groove structure can be set on the slider 802 to correspond thereto.

[0028] For this embodiment, the slide rail 103 is arranged in a straight line. Based on the existing square or rectangular shell structure, the straight line arrangement can save more movement space. Of course, the slide rail 103 can also be arranged in a curved manner. For example, in some special usage scenarios, the shell needs to be made into an arc structure, or based on the component layout requirements inside the shell, the slide rail 103 can also be arranged in a circular arc structure.

[0029] In this embodiment, the support member connection part 401 includes a connection hole 4011 and a key slot 4012 located on the side wall of the connection hole 4011. The moving contact is installed on the contact connection part 803 through the support member connection part 401, which can be well connected to prevent the moving contact from loosening and rotating. The contact connection part 803 of the corresponding support member 80 includes a connection shaft 8031 ​​corresponding to the connection hole 4011 and a symmetrically arranged key 8032 protruding from the outer periphery of the connection shaft 8031.

[0030] In this embodiment, a slide rail surface 1031 is provided on the top of the retaining wall 1030, and the moving contact 40 has a first moving contact piece 41. The first moving contact piece 41 is provided with a first supporting surface 411. The first supporting surface 411 is mounted on the slide rail surface 1031 and at the same time forms a contact and mutual limitation with the upper limit surface 804 of the slider 804. The moving contact 40 also slides on the slide rail surface 1031 through the first supporting surface 411.

[0031] Furthermore, the moving contact 40 clamps the stationary contact in a clamp-like manner, so the moving contact 40 also has a stacked second moving contact piece 42, and the two ends are provided with openings to form a clamp-like clamp. The second moving contact piece 42 is provided with a second supporting surface 421 facing opposite to the first supporting surface 411, which is used to cooperate with the first supporting surface 411 to form upper and lower limits for the first moving contact piece 41 and the second moving contact piece 42.

[0032] In this embodiment, the slide rail 103 includes: a first slide rail 103a extending from the middle area of ​​the housing 10 to the first side edge of the housing 10 and a second slide rail 103b extending from the middle area of ​​the housing 10 to the second side edge of the housing 10. By setting up the double slide rails, the sliding of two independent moving contacts can be realized, thereby realizing the setting of two circuit switches in one switch unit. Of course, the extension distance of the slide rail 103 is arranged based on the setting position of the static contact. In practical application, a feasible setting can be made.

[0033] In this embodiment, the first side and the second side are two opposite sides, and the symmetrical arrangement is conducive to the arrangement and installation of the arc extinguishing chamber, ensuring the arc extinguishing effect. Of course, when the requirements for the arc extinguishing chamber are not high (for example, when the space requirement for the arc extinguishing chamber is not large), slide rails can also be arranged on the other two opposite sides to form a cross-shaped arrangement, so that the sliding of the four moving contacts can be realized.

[0034] In this embodiment, if Figure 3-5 As shown, the moving contact 40 includes: a first moving contact piece 41 and a second moving contact piece 42, the first moving contact piece 41 and the second moving contact piece 42 are relatively assembled and arranged, and the two ends of the first moving contact piece 41 and the second moving contact piece 42 are respectively provided with bending parts 413 and 414 that are relatively bent outward, and the bending parts 413 and 414 respectively form opening structures 402 and 403, and the opening structures 402 and 403 are used to clamp the contact parts corresponding to the static contact assembly to achieve closing, and the structures of the opening structures 402 and 403 are adapted to the shapes of the static contact assembly (the first static contact 31, the second static contact 32, the third static contact 33 and the fourth static contact 34) so ​​that the two can clamp and contact each other.

[0035] Furthermore, a support member connecting portion 401 is provided in the middle of each of the first moving contact piece 41 and the second moving contact piece 42 for installation and cooperation with the contact connecting portion 803 of the support member 80. The cross-section of the contact connecting portion 803 matches the support member connecting portion 401. The support member connecting portion 401 includes a connecting hole 4011 and a key groove 4012 on the side wall. The moving contact 40 is installed on the contact connecting portion 803 through the support member connecting portion 401, and can be well connected to avoid loosening and rotation of the moving contact 40.

[0036] As another alternative implementation, the stationary contact in the stationary contact assembly may adopt an open structure, while the moving contact may adopt a single-piece structure, and the opening structure of the stationary contact may clamp the contact portion of the moving contact.

[0037] Furthermore, the opening structures 402 and 403 of the first moving contact piece 41 and the second moving contact piece 42 are provided with outwardly bent guide edges 4131 and 4141, and the guide edges 4131 and 4141 form a flaring structure. The guide edges 4131 and 4141 are arranged in the direction toward the static contact and are located on the side edges of the first moving contact piece 41 and the second moving contact piece 42. The gap of the flaring structure is larger than the gap of the opening structure, so that the static contact can be smoothly inserted into the opening structures 402 and 403.

[0038] In this embodiment, the outer end edges of the bending portions 413, 414 are further provided with arc-striking edges 4132, 4142 and arc-striking tips 4133, 4143, the arc-striking edges 4132, 4142 are inclined relative to the movement path of the moving contact 40, the arc extinguishing chamber 20 is arranged outside the movement trajectory of the arc-striking tips 4133, 4143 of the moving contact 40, the first ends of the arc-striking edges 4132, 4142 are farther away from the arc extinguishing chamber 20 than the second ends thereof, and the arc-striking tips 4133, 4143 are arranged at the second ends of the arc-striking edges 4132, 4142.

[0039] Further, combined with Figure 1 and Figure 2 As shown, both ends of the first moving contact piece 41 and the second moving contact piece 42 are provided with the arc-striking edges 4132, 4142 and arc-striking tips 4133, 4143, the connecting line between the two ends of the first moving contact piece 41 and the second moving contact piece 42 is perpendicular to their movement direction, and arc-extinguishing chambers 20 are provided on the outer sides of the arc-striking tips 4133, 4143 at both ends of the first moving contact piece 41 and the second moving contact piece 42.

[0040] like Figure 1 As shown, the contact driving mechanism in this embodiment includes a rotatably arranged transmission shaft 7, a rotating frame 6 fixed on the transmission shaft 7, a first connecting rod 5a and a second connecting rod 5b hinged to both ends of the rotating frame 6, both ends of the rotating frame 6 protrude from the radial direction of the transmission shaft 7, and the first connecting rod 5a and the second connecting rod 5b are respectively hinged to two moving contact assemblies, that is, respectively hinged to the transmission connection part 801 of the support member 80 of the corresponding moving contact assembly, changing the traditional circular motion of the moving contact to sliding motion of the moving contact, which is conducive to the overall miniaturization of the product. Figure 2 The transmission shaft 7 is arranged at the center of the housing 10 and passes through the housing 10. The housing 10 is provided with a transmission shaft mounting hole 101. Two slide rails 103 are symmetrically arranged on both sides of the transmission shaft 7 in the radial direction, namely a first slide rail 103a and a second slide rail 103b.

[0041] Based on the above embodiments, reference Figure 1As shown, the slide rails 103 are arranged on opposite sides of the present embodiment. The switch unit in the present embodiment includes two moving contacts 40, namely a first moving contact 41 and a second moving contact 42, and four stationary contacts 30, namely a first stationary contact 31, a second stationary contact 32, a third stationary contact 33 and a fourth stationary contact 34. The driving mechanism of the moving contact includes a transmission shaft 7, a rotating frame 6 fixed on the transmission shaft 7, a first connecting rod 5a and a second connecting rod 5b hinged to two ends of the rotating frame 6 respectively, and the driving connection parts of the first connecting rod 5a and the second connecting rod 5b are hinged to the first moving contact 41 and the second moving contact 42 respectively. The transmission shaft 7 rotates through the first connecting rod 5a to drive the first moving contact 41 to move linearly along the left slide rail, and the two ends of the first moving contact 41 contact with the first static contact 31 and the second static contact 32 to conduct a circuit. At the same time, the transmission shaft 7 rotates through the second connecting rod 5b to drive the second moving contact 42 to move linearly along the right slide rail, and the two ends of the second moving contact 42 contact with the third static contact 33 and the fourth static contact 34 to conduct another circuit. That is to say, based on the driving system of the moving contact of this embodiment, in one switch unit, two independent moving contacts can be driven simultaneously to slide linearly along the slide rail, and each independent moving contact can respectively contact with two static contacts to conduct a circuit. Therefore, in one switch unit of this embodiment, at least two circuits can be disconnected, that is, there are two circuit switches.

[0042] Of course, based on the slide rail arrangement of this embodiment, it is also possible to realize the arrangement of four circuit switches under reasonable space arrangement. For example, this embodiment adopts the method of relatively arranging two slide rails. If a cross-shaped arrangement is adopted, four slide rails can be arranged, and thus the arrangement of four circuit switches can be realized. In particular, in some specific applications, when the current is small, the space of the arc extinguishing chamber can be compressed or omitted (to make way for the arrangement space of the slide rails), thereby realizing the reasonable arrangement of the four circuit switches.

[0043] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0044] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A switch unit, comprising a housing (10), a moving contact assembly, a stationary contact assembly, and a contact driving mechanism, characterized in that: The moving contact assembly comprises: a moving contact (40) and a support member (80); the housing (10) is provided with a slide rail (103); the support member (80) comprises a slider (802) slidably connected to the slide rail (103), a contact connection portion (803) fixedly connected to the moving contact (40), and a transmission connection portion (801) for transmission connection with a contact drive mechanism; the slide rail (103) extends from a position adjacent to the contact drive mechanism toward the direction of the stationary contact assembly and is adjacent to the stationary contact assembly, and the moving contact (40) can slide along the slide rail (103) under the drive of the contact drive mechanism to contact or separate from the stationary contact.

2. The switch unit according to claim 1, characterized in that: The slide rail (103) is formed by two parallel retaining walls (1030) arranged on the bottom surface of the housing (10).

3. The switch unit according to claim 1, characterized in that: The contact connecting portion (803) comprises a connecting shaft (8031) and a key (8032) protruding from the outer periphery of the connecting shaft (8031); the movable contact is correspondingly provided with a support member connecting portion (401); the support member connecting portion (401) comprises a connecting hole (4011) and a key slot (4012) located on the side wall of the connecting hole (4011); the connecting shaft (8031) is arranged in the connecting hole (4011), and the key (8032) is inserted into the key slot (4012).

4. The switch unit according to claim 2, characterized in that: A slide surface (1031) is provided on the top of the retaining wall (1030); the moving contact (40) comprises a first moving contact piece (41); the first moving contact piece (41) is provided with a first supporting surface (411); the first supporting surface (411) is mounted on the slide surface (1031) and forms contact and mutual limitation with the upper limit surface (804) of the slider (80); the moving contact (40) slides on the slide surface (1031) via the first supporting surface (411).

5. The switch unit according to claim 4, characterized in that: The movable contact (40) further comprises a second movable contact piece (42) stacked with the first movable contact piece (41), and the second movable contact piece (42) is provided with a second supporting surface (421) facing opposite to the first supporting surface (411), and is used for cooperating with the first supporting surface (411) to form upper and lower limit positions for the first movable contact piece (41) and the second movable contact piece (42).

6. The switch unit according to claim 1 or 2, characterized in that: The slide rail (103) comprises: a first slide rail (103a) extending from the middle area of ​​the shell (10) to the first side edge of the shell (10) and a second slide rail (103b) extending from the middle area of ​​the shell (10) to the second side edge of the shell (10); the first side and the second side are two opposite sides.

7. The switch unit according to claim 1, characterized in that: The moving contact (40) comprises: a first moving contact piece (41) and a second moving contact piece (42); the first moving contact piece (41) and the second moving contact piece (42) are relatively assembled and arranged; two ends of the first moving contact piece (41) and the second moving contact piece (42) are respectively provided with bending parts (413, 414) relatively bent outward; the bending parts (413, 414) respectively form opening structures (402, 403) in contact with the contact parts of the stationary contact.

8. The switch unit according to claim 7, characterized in that: The opening structures (402, 403) of the first moving contact piece (41) and the second moving contact piece (42) are respectively provided with guide curved edges (4131, 4141) facing the direction of the stationary contact assembly.

9. The switch unit according to claim 7, characterized in that: The outer end edge of the bending portion (413, 414) is also provided with an arc-striking edge (4132, 4142) and an arc-striking tip (4133, 4143); the arc-striking edge (4132, 4142) is arranged obliquely relative to the movement path of the moving contact (40); the arc-striking tip (4133, 4143) of the moving contact (40) is arranged close to one side of the arc extinguishing chamber; the first end of the arc-striking edge (4132, 4142) is at a greater distance from the arc extinguishing chamber (20) than the second end thereof; and the arc-striking tip (4133, 4143) is arranged at the second end of the arc-striking edge (4132, 4142).

10. The switch unit according to claim 9, characterized in that: The opening structure (402, 403), arc-striking edges (4132, 4142) and arc-striking tips (4133, 4143) are provided at both ends of the first moving contact piece (41) and the second moving contact piece (42); a line connecting the two ends of the first moving contact piece (41) and the second moving contact piece (42) is perpendicular to their movement direction; and arc-extinguishing chambers (20) are provided outside the arc-striking tips (4133, 4143) at both ends of the first moving contact piece (41) and the second moving contact piece (42).

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