Rotary plug-in type double-breakpoint automatic change-over switch

Abstract

A rotary plug-in type double-breakpoint automatic change-over switch comprises an actuating mechanism and a contact arc extinguishing mechanism, the actuating mechanism comprises a single-coil electromagnet and a four-connecting-rod transmission mechanism arranged at the movable iron core end of the electromagnet, and power conversion of the automatic change-over switch can be achieved under the condition that the electromagnet is powered on once. The contact arc extinguishing mechanism is arranged in an independent unit box, a rotary double-breakpoint moving contact and a rotary double-breakpoint static contact are arranged in the unit box, and the double-pole or multi-pole automatic change-over switch is formed by combining the unit boxes. The arc extinguishing performance and the working stability of the automatic change-over switch are improved, the power supply conversion time of the automatic change-over switch is improved due to the rigid transmission that the transmission ratio of the driving gear to the driven gear is less than 1, and convenience is brought to the production and the maintenance of the automatic change-over switch due to the adoption of the standardized independent unit box.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a rotary plug-in type double-breakpoint automatic transfer switch. Background Art

[0002] The automatic transfer switch is a commonly used low-voltage electrical appliance, which is often used for mutual conversion between two power supplies to ensure that when one power supply fails or stops supplying power, the other power supply can be quickly switched to ensure the normal power supply of the load circuit. The automatic transfer switch generally has an action mechanism and a contact arc extinguishing mechanism. Its action mechanism generally adopts a lever action mechanism, and the contact arc extinguishing mechanism generally adopts an upper moving contact, a lower static contact and an independent arc extinguishing box. Traditional double-break switches are generally used for contactors, and rotary plug-in double-break automatic transfer switches suitable for infrequent operation have not yet been launched on the market. The utility model introduces a new automatic transfer switch, whose action mechanism consists of a working gear and a rotary moving contact, and the contact arc extinguishing mechanism consists of independent unit boxes, which not only simplifies the structure of the automatic transfer switch, but also further improves the conversion speed, arc extinguishing ability and working stability of the automatic transfer switch. Utility Model Content

[0003] The technical solution adopted by the utility model is:

[0004] A rotary plug-in double-breakpoint automatic transfer switch, comprising an action mechanism and a contact arc extinguishing mechanism;

[0005] The action mechanism includes an electromagnet, a connecting rod, a flywheel, a square shaft, a driving gear, a driven gear, a spline and a double-breakpoint rotating moving contact group. One end of the square shaft is arranged on the flywheel, and the other end is arranged on the driving gear. The driving gear meshes with the driven gear. The driven gear is sleeved on the spline. One end of the spline is vertically inserted into the rotating shaft of the moving contact group. The rotation of the spline drives the moving contact group to rotate and plug and unplug the static contact of the automatic transfer switch to complete the power conversion of the automatic transfer switch.

[0006] It is further provided that the electromagnet is a one-way pull-in electromagnet, comprising a coil, a moving iron core sleeved in the coil, and a power spring arranged in the moving iron core. When the coil is energized, the moving contact is driven to rotate by a four-bar transmission mechanism composed of the moving iron core, a connecting rod, a flywheel, and a square shaft at the center of the flywheel. When the coil is de-energized, the power spring in the moving iron core releases power, and the moving contact is driven to rotate again by the four-bar transmission mechanism at the end of the moving iron core to perform power conversion of the automatic transfer switch.

[0007] It is further configured that, when the common power supply is closed at the initial position of the automatic transfer switch, when the coil of the electromagnet is energized, the moving iron core of the electromagnet will compress the power spring and move to the right at the same time, the power spring accumulates force, and the flywheel rotates clockwise. When the angle between the flywheel and the connecting rod approaches the 180° dead point, the coil is de-energized, and the flywheel continues to rotate clockwise by inertia. After passing the dead point, the power spring immediately releases power, and the moving contact group is driven to rotate through the four-bar transmission mechanism at the end of the moving iron core. When the common power supply is closed, the automatic transfer switch is switched and locked in the standby power supply closing position;

[0008] When the coil of the electromagnet is energized again, the moving iron core of the electromagnet will compress the power spring and move to the right at the same time. The power spring accumulates force, and the flywheel will rotate counterclockwise at this time. When the angle between the flywheel and the connecting rod approaches the 180° dead point, the coil is de-energized, and the flywheel continues to rotate counterclockwise by inertia. After passing the dead point, the power spring immediately releases power, and the four-bar transmission mechanism at the end of the moving iron core drives the moving contact group to rotate. When the standby power is closed, the automatic transfer switch is switched to the normal power closing position;

[0009] It is further configured that the moving contact includes two groups of moving contact pieces, contact supports and clamping springs that are symmetrically arranged and have completely the same structure. The moving contact piece is the conductor of the moving contact. A waisted round boss is arranged in the middle of the moving contact piece to form a recess at the ends of the two moving contact pieces so that the moving contact can be easily inserted into the static contact. The contact support serves as a mounting and fixing body for the moving contact piece. The clamping spring provides elastic pressure for the moving contact piece. The two groups of moving contact pieces, contact supports and clamping springs are vertically arranged in the moving contact mounting groove of the moving contact shaft through the upper and lower half moving contact shafts.

[0010] It is further arranged that the static contact comprises a normal power static contact, a standby power static contact and a load static contact, and the static contact is arranged at the rotation radius end of the moving contact. At the same time, the moving and static contact connection lines when the moving contact is plugged into the normal power static contact and the moving and static contact connection lines when the moving contact is plugged into the standby power static contact are 90° to each other, so as to ensure that the moving contact can be reliably plugged and unplugged with the static contacts when the automatic transfer switch power is switched. This plug-in structure of moving and static contacts can avoid the defect that the moving and static contacts of the automatic transfer switch are easily bounced open under the action of high current electric force. At the same time, when the double-breakpoint rotating moving contact switches from one power supply to another, two power-off points will be formed at the moment of power switching, and a lower arc voltage can be formed at the two power-off points, which is beneficial to improving the short-time withstand current and arc extinguishing performance of the automatic transfer switch.

[0011] It is further configured that a common power terminal is provided at the other end of the common power static contact, and the common power terminal and the common power static contact are an integrated structure; a backup power terminal is provided at the other end of the backup power static contact, and the backup power terminal and the backup power static contact are an integrated structure; the load static contact includes a common power load static contact and a backup power load static contact, and the common power load static contact, the backup power load static contact and the load terminal are an integrated structure.

[0012] It is further provided that the contact arc extinguishing mechanism is arranged in an independent unit box, and the unit box includes a unit box cover, a double-breakpoint rotating moving contact group and a common power static contact, a standby power static contact, a load static contact and arc extinguishing pieces arranged at the upper and lower parts of the inner side of the box cover, and two or more independent unit boxes are connected through the spline connecting shaft and the spline female groove at the two ends of the moving contact rotating shaft to form a bipolar or multi-pole automatic transfer switch. The independent unit boxes of this standardized structure can be conveniently combined into a multi-pole automatic transfer switch, which brings convenience to the production and maintenance of the automatic transfer switch;

[0013] It is further configured that the arc extinguishing piece in the unit box is configured to be square, an arc inlet is provided at the lower part, radial arc extinguishing piece mounting grooves are provided at the upper and lower parts of the inner side of the unit box cover, the arc extinguishing piece is combined in two unit box covers, and arc outlets are provided at the upper and lower parts of the load end at the inner side of the unit box cover.

[0014] It is further provided that the driving gear and the driven gear can be set with a transmission ratio less than 1 according to the conversion speed required by the automatic transfer switch, so as to increase the speed on the driven gear and increase the rotation speed of the double-breakpoint rotating moving contact group, so as to improve the technical performance of the automatic transfer switch;

[0015] It is further provided that four spline grooves are evenly arranged on one side of the spline, the driven gear is sleeved on the spline groove, and the spline groove end of the spline is vertically inserted into the moving contact shaft of the double-breakpoint rotating moving contact group, so that when the automatic transfer switch is switched on the power supply, the driving wheel drives the driven wheel to rotate, and the spline on the driven wheel shaft drives the double-breakpoint rotating moving contact group to rotate to complete the power supply switching of the automatic transfer switch;

[0016] It is further configured that the four-bar linkage transmission mechanism includes a moving iron core, a connecting rod hinged to the end of the moving iron core, a flywheel hinged to the connecting rod, and a square shaft arranged at the center of the flywheel. The driving gear and the driven gear are driven to rotate through the four-bar linkage transmission mechanism, thereby realizing the power conversion of the automatic conversion switch.

[0017] The automatic transfer switch of the above structure has the following beneficial effects:

[0018] Since the automatic transfer switch adopts a rotating double-breakpoint plug-in contact structure, two power-off points will be formed at the moment of power conversion, which reduces the arc voltage, is beneficial to the electrical arc extinguishing of the automatic transfer switch, and improves the short-time withstand current value of the automatic transfer switch. At the same time, it overcomes the defect that the moving and static contacts of the general transfer switch are easy to bounce open under the action of large current electric force, and improves the working stability of the transfer switch. Due to the rigid transmission of gears, and the transmission ratio of the driving gear to the driven gear is less than 1, the double-breakpoint rotating moving contact group of the automatic transfer switch can obtain a faster rotation speed to improve the power conversion time of the automatic transfer switch. Due to the use of standardized independent unit boxes, it brings convenience to the production and maintenance of the automatic transfer switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structure diagram of the automatic transfer switch of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the action mechanism;

[0021] Figure 3 for Figure 1 Double breakpoint rotating moving contact group structure diagram;

[0022] Figure 4 for Figure 3 Double breakpoint rotating moving contact group shaft structure diagram;

[0023] Figure 5 for Figure 3 The structure diagram of the moving contact of the double-breakpoint rotating moving contact group;

[0024] Figure 6 for Figure 1 Internal structure diagram of each pole unit box;

[0025] Figure 7 This is a schematic diagram of the structure of the moving and static contact positions when the backup power supply of the automatic transfer switch is closed;

[0026] Figure 8 This is a schematic diagram of the position structure of the moving and static contacts of the automatic transfer switch when the common power supply is closed;

[0027] Fig. 9 It is a schematic diagram of the connecting rod and flywheel structure when the power supply is closed in the initial position of the automatic transfer switch;

[0028] Fig.10 It is a schematic diagram of the connecting rod and flywheel structure when the automatic transfer switch is switched to the backup power supply and closed;

[0029] Fig.11 for Figure 1 Schematic diagram of the structure of each connection terminal;

[0030] Fig.12 for Figure 2 Spline structure diagram;

[0031] Fig.13 for Figure 6 Arc extinguishing piece structure diagram. DETAILED DESCRIPTION

[0032] First of all, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "clockwise", "counterclockwise", "front", "back", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or part 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. In addition, the terms "normal power supply" and "backup power supply" are only used to describe the position relative to the drawing, and cannot be understood as indicating or implying the inherent characteristic names of the position in actual use.

[0033] Next, combine Figures 1 to 13 , the utility model is further illustrated through specific embodiments.

[0034] like Figure 1 As shown, a rotary plug-in double-breakpoint automatic transfer switch comprises an actuating mechanism 1 in the front part and a contact arc extinguishing mechanism 2 in the rear part which is installed in a unit box;

[0035] Further settings, such as Figure 2 , Figure 3 As shown, the action mechanism includes an electromagnet 101, an electromagnet moving iron core 1011, a connecting rod 1012, a flywheel 3, and a square shaft 4. The four-bar transmission mechanism composed of the electromagnet moving iron core 1011, the connecting rod 1012, the flywheel 3, and the square shaft 4 drives the driving gear 5, the driven gear 7, the spline 8, and the double-breakpoint rotating moving contact group 6 to rotate and plug and unplug with the static contact of the automatic transfer switch to complete the power conversion of the automatic transfer switch;

[0036] It is further configured that one end of the square shaft 4 is arranged on the flywheel 3, and the other end is arranged on the driving gear 5, the driving gear meshes with the driven gear, the driven gear 7 is sleeved on the spline 8, and the spline mounting groove 801 of the spline 8 is vertically inserted into the moving contact shaft 601 of the double-breakpoint rotating moving contact group 6;

[0037] It is further provided that the electromagnet 1 is a one-way pull-in electromagnet, comprising a coil 103, a moving iron core 1011 sleeved in the coil 103, a power spring 104 arranged in the moving iron core 1011, a yoke 102, and a static iron core 105. When the coil 103 is energized, the flywheel 3 is driven by the connecting rod 1012 at the end of the moving iron core 1011, and the flywheel 3 drives the driving gear 5 and the driven gear 6 to rotate through the square shaft 4, thereby driving the double-breakpoint rotating moving contact group 6 to rotate to perform power conversion of the automatic transfer switch;

[0038] Further settings, such as Figure 3 , Figure 4 As shown, the double-breakpoint rotating moving contact group 6 includes a moving contact shaft 601 and a moving contact 602. The moving contact shaft 601 is composed of two halves of identical structure. A recessed spline female groove 6013 is provided at one end of the moving contact shaft 601, and a protruding spline connecting shaft 6011 is provided at the other end. A moving contact mounting groove 6012 is provided in the middle. The spline female groove 6013 at one end of the moving contact shaft and the spline connecting shaft 6011 at the other end are used to connect two or more independent unit boxes 2 of the automatic transfer switch to form a double-pole or multi-pole automatic transfer switch.

[0039] Further settings, such as Figure 5 As shown, the moving contact 602 includes two groups of moving contact pieces 6021, a contact support 6022 and a pressing spring 6023 which are symmetrically arranged and have exactly the same structure. The moving contact piece 6021 is a conductor of the moving contact. A waisted round boss 6021 is arranged in the middle of the moving contact piece 6021 to form a gap at the ends of the two moving contact pieces 6021 so that the moving contact piece 6021 can be easily inserted into the static contact. The contact support 6022 is a mounting and fixing body for the moving contact piece 6021. The pressing spring 6023 provides elastic working pressure for the moving contact piece 6021 so that the moving contact piece can be elastically pressed into each static contact. The two groups of moving contact pieces 6021, the contact support 6022 and the pressing spring 6023 are vertically arranged in the moving contact mounting groove 6012 of the moving contact shaft through the upper and lower half moving contact shafts.

[0040] Further settings, such as Figure 6 As shown, the contact arc extinguishing mechanism is arranged in an independent unit box, and the unit box includes a unit box cover 206, a double-breakpoint rotating moving contact group 6, a common power static contact 201, a standby power static contact 202, a load static contact 203, and arc extinguishing pieces 205 arranged at the upper and lower parts of the inner side of the unit box cover 206. Two or more independent unit boxes 2 are connected through the spline connecting shaft 6011 and the spline female groove 6013 on both sides of the moving contact rotating shaft to form a bipolar or multi-pole automatic transfer switch;

[0041] Further settings, such as Figure 7, Figure 8 As shown, the static contact includes a common power static contact 2012, a standby power static contact 2022 and a load static contact 2032, and the common power static contact 2012, the standby power static contact 2022 and the load static contact 2032 are arranged at the rotation radius end of the double-breakpoint rotating moving contact 602, and at the same time, the dynamic and static contact connection line when the double-breakpoint rotating moving contact 602 is plugged in with the common power static contact 2012 and the dynamic and static contact line when the double-breakpoint rotating moving contact 602 is plugged in with the standby power static contact 2022 The contact lines are connected at 90° to each other to ensure that the double-breakpoint rotating moving contact 602 can be reliably plugged in and out of the static contacts. This plug-in structure of moving and static contacts can avoid the defect that the moving and static contacts of the automatic transfer switch are easily popped open under the action of high-current electric force. At the same time, when the double-breakpoint rotating moving contact switches from one power supply to another, two power-off points will be formed at the moment of switching. A lower arc voltage can be formed at the two power-off points, which is beneficial to improving the short-time withstand current and arc extinguishing performance of the automatic transfer switch.

[0042] Further settings, such as Fig. 9 , Fig.10 As shown, the electromagnet is a one-way attraction electromagnet, and one electromagnet can complete the two action processes of the automatic transfer switch from the normal power supply to the backup power supply and the backup power supply to the normal power supply. When the normal power supply is closed in the initial position of the automatic transfer switch, the angle between the connecting rod 1012 and the flywheel 3 is 72° above the horizontal line of the axis of the connecting rod and the flywheel. When the coil 103 of the electromagnet is energized, the moving iron core 101 of the electromagnet will compress the power spring 104 and move to the right at the same time. The power spring 104 accumulates power, and the flywheel 3 rotates clockwise. When the angle between the flywheel 3 and the connecting rod 1012 approaches the dead point of 180°, the coil 103 is de-energized, and the flywheel 3 continues to rotate clockwise by inertia. Rotate, after passing the dead point, the power spring 104 releases power immediately, and the four-bar transmission mechanism composed of the moving iron core 101, the connecting rod 1012, the flywheel 3, and the square shaft 4 drives the driving gear 5 and the driven gear 7 to rotate until the angle between the flywheel 3 and the connecting rod 1012 is 72° below the horizontal line of the axis of the connecting rod 1012 and the flywheel 3, and locks, and at the same time drives the double-breakpoint rotating moving contact group 6 to rotate 90°, and the automatic transfer switch is locked in the standby power closing position when the normal power is closed;

[0043] When the coil 103 of the electromagnet is energized again, the moving iron core 101 of the electromagnet will compress the main power spring 104 and move to the right at the same time. The main power spring 104 accumulates power, and the flywheel 3 will rotate counterclockwise at this time. When the angle between the flywheel 3 and the connecting rod 1012 is close to the 180° dead point, the coil 103 is de-energized, and the flywheel 3 continues to rotate counterclockwise by inertia. After passing the dead point, the main power spring 104 immediately releases power, and rotates through the connecting rod 1012, the flywheel 3, the square shaft 4, the driving gear 5, and the driven gear 7 until the angle between the flywheel 3 and the connecting rod 1012 is at 72° above the horizontal line of the axis of the connecting rod 1012 and the flywheel 3, and is locked. At the same time, the double-breakpoint rotating moving contact group 6 is driven to rotate 90°, and the automatic transfer switch is switched and locked to the normal power closing position when the backup power is closed.

[0044] Further settings, such as Fig.11 As shown, the common power static contact 201 includes a common power terminal 2011 and an integral common power static contact 2012, the standby power static contact 202 includes a standby power terminal 2021 and an integral standby power static contact 2022, the load static contact 203 includes a load terminal 2031 and an integral load static contact 2032, the load static contact 2032 includes a common power load static contact and a standby power load static contact, and the common power load static contact and the standby power load static contact are an integrated structure.

[0045] Further settings, such as Figure 3 , Fig.12 As shown, four spline grooves 801 are evenly arranged on one side of the spline 8, and the driven gear 7 is sleeved on the spline groove 801. The spline groove end 802 of the spline is then vertically inserted into the moving contact shaft 601 of the double-breakpoint rotating moving contact group 6. In this way, when the automatic transfer switch is switched in power, the driving wheel 5 drives the driven wheel 6 to rotate, and the spline 8 on the driven wheel shaft drives the double-breakpoint rotating moving contact group 6 to rotate to complete the power conversion of the automatic transfer switch;

[0046] Further settings, such as Figure 2 As shown, the transmission ratio of the driving gear 5 to the driven gear 7 is set to 0.75, so that the speed is increased on the driven gear 7, and the rotation speed of the double-breakpoint rotating moving contact group 6 is increased to increase the power conversion speed of the automatic transfer switch;

[0047] Further settings, such as Figure 6 , Fig.13As shown, the arc extinguishing piece 205 is arranged in a square shape, and an arc inlet port 2051 is arranged at the lower part, and radial arc extinguishing piece mounting grooves are arranged at the upper and lower parts of the inner side of the unit box cover 206 of the unit box 2, and the arc extinguishing piece 205 is combined in the two unit box covers 206 through the mounting grooves, and arc outlet ports 2061 are arranged at the upper and lower parts of the load end inside the unit box cover 206.

[0048] It should be noted that the above embodiments are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A rotary plug-in double-breakpoint automatic transfer switch, comprising an action mechanism and a contact arc extinguishing mechanism; The action mechanism includes an electromagnet, a connecting rod, a flywheel, a square shaft, a driving gear, a driven gear, a spline and a double-breakpoint rotating moving contact group. One end of the square shaft is arranged on the flywheel, and the other end is arranged on the driving gear. The driving gear meshes with the driven gear. The driven gear is sleeved on the spline. One end of the spline is vertically inserted into the rotating shaft of the moving contact group. The rotation of the spline drives the moving contact group to rotate and plug and unplug the static contact of the automatic transfer switch to complete the power conversion of the automatic transfer switch. Its characteristics are: The electromagnet is a one-way pull-in electromagnet, comprising a coil, a moving iron core sleeved in the coil, and a power spring arranged in the moving iron core. When the coil is energized, the moving contact group is driven to rotate through the four-bar transmission mechanism at the end of the moving iron core. When the coil is de-energized, the power spring in the moving iron core releases power, and the four-bar transmission mechanism at the end of the moving iron core is used to drive the moving contact group to rotate again, thereby performing power conversion of the automatic transfer switch. The moving contact group is a double-breakpoint rotating moving contact group, including a moving contact shaft and a moving contact. The moving contact shaft is composed of two halves of completely identical structure, one end of which is provided with a recessed spline female groove, the other end of which is provided with a protruding spline connecting shaft, and a moving contact mounting groove is provided in the middle. The moving contact includes two groups of moving contact pieces, contact support members and compression springs that are symmetrically arranged and have completely identical structures. The two groups of moving contact pieces, contact support members and compression springs are vertically combined in the moving contact mounting groove of the moving contact shaft. The contact arc extinguishing mechanism is arranged in an independent unit box, and the unit box includes a unit box cover, a double-breakpoint rotating moving contact group, a common power static contact, a standby power static contact, a load static contact and arc extinguishing plates arranged on the upper and lower parts of the inner side of the box cover. Two or more independent unit boxes are connected through the spline connecting shaft and the spline female groove at the two ends of the moving contact rotating shaft to form a bipolar or multi-pole automatic transfer switch.

2. The automatic transfer switch according to claim 1, characterized in that: The static contacts include a common power static contact, a standby power static contact and a load static contact. The static contacts are arranged at the rotation radius end of the moving contact. At the same time, the moving and static contact connection lines when the moving contact is plugged into the common power static contact and the moving and static contact connection lines when the moving contact is plugged into the standby power static contact are 90° to each other, so as to ensure that the moving contact can be reliably plugged in and out of the static contacts when the automatic transfer switch power is switched.

3. The automatic transfer switch according to claim 1, characterized in that: A common power terminal is provided at the other end of the common power static contact, and the common power terminal and the common power static contact are an integrated structure. A backup power terminal is provided at the other end of the backup power static contact, and the backup power terminal and the backup power static contact are an integrated structure. The load static contact includes a common power load static contact and a backup power load static contact, and the common power load static contact, the backup power load static contact and the load terminal are an integrated structure.

4. The automatic transfer switch according to claim 1, characterized in that: The arc extinguishing piece is arranged in a square shape, with an arc inlet opening at the lower part, radial arc extinguishing piece mounting grooves are arranged at the upper and lower parts of the inner side of the unit box cover, the arc extinguishing piece is combined in two unit box covers, and arc outlet openings are arranged at the upper and lower parts of the load end at the inner side of the unit box cover.

5. The automatic transfer switch according to claim 1, characterized in that: The driving gear and the driven gear can be set with a transmission ratio less than 1 according to the conversion speed required by the automatic transfer switch, so as to increase the speed on the driven gear to improve the power conversion speed of the automatic transfer switch.

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