An isolating switch with stable dynamic and static contact points

Abstract

The present invention relates to an isolating switch with stable contact between moving and static contacts, comprising a base, a first wiring screw, a second wiring screw, a static contact rod, a static contact, a moving contact rod, a moving contact, and an opening and closing driving mechanism, wherein the static contact rod is connected to the first wiring screw, and further comprising a conductive mechanism, wherein the conductive mechanism comprises a wiring board and a flexible connection, wherein the rear end of the moving contact rod can be rotatably mounted on the base, the moving contact is mounted on the front end of the moving contact rod, one end of the wiring board is connected to the second wiring screw, and the other end is connected to the rear end of the moving contact rod through a flexible connection, the wiring board and the static contact are respectively located on both sides of the moving contact rod, the opening and closing driving mechanism drives the moving contact rod to rotate so that the moving contact contacts or disconnects with the static contact, and the wiring board has a repulsion generating section located beside the moving contact rod and extending along the moving contact rod; when in a closed state, the angle θ between the repulsion generating section and the moving contact rod is less than 10 degrees, and the current in the repulsion generating section flows in the opposite direction to the current in the moving contact rod.

Description

Technical Field

[0001] The invention relates to the field of electrical components, in particular to an isolating switch with stable moving and static contacts. Background Art

[0002] The isolating switch is a switching device that is mainly used for "isolating power supply, switching operation, connecting and disconnecting small current circuits" and has no arc extinguishing function. When the isolating switch is in the open position, there is an insulation distance that meets the specified requirements and an obvious disconnection mark between the contacts; when it is in the closed position, it is a switching device that can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time. It is generally used as a high-voltage isolating switch, that is, an isolating switch with a rated voltage of more than 1kV. Its working principle and structure are relatively simple, but due to its large usage and high working reliability requirements, it has a great impact on the design, construction and safe operation of substations and power plants. The main feature of the isolating switch is that it has no arc extinguishing ability and can only open and close the circuit without load current.

[0003] In conventional disconnectors, the contact between the moving and static contacts in the disconnector is achieved mechanically, and the pressure provided to the moving contact in the closed state is limited. Although the contact surface of the moving and static contacts looks smooth, they are actually only in contact with each other at some spots. When current passes through, there will be an electromotive force between the moving and static contacts. This is an electromotive force under the action of the current's own magnetic field, which is related to the magnitude of the current. Therefore, when power is turned on, especially under the clearness of large currents, a large electromotive force will be generated between the moving and static contacts, causing the moving contact to shake or disconnect, which will generate an arc between the moving and static contacts and cause a fault. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an isolating switch with stable contact between moving and static contacts, which can ensure stable contact between moving and static contacts when current is conducted and has high safety.

[0005] To achieve the above-mentioned object, the present invention provides an isolating switch with stable contact between moving and static contacts, comprising a base, a first wiring screw, a second wiring screw, a static contact rod, a static contact installed on the static contact rod, a dynamic contact rod, a dynamic contact installed on the dynamic contact rod, and an opening and closing driving mechanism, wherein the static contact rod is connected to the first wiring screw, and further comprises a conductive mechanism, wherein the conductive mechanism comprises a wiring board and a flexible connection, wherein the wiring board is fixed to the base, the rear end of the dynamic contact rod can be rotatably installed on the base, the dynamic contact is installed at the front end of the dynamic contact rod, one end of the wiring board is connected to the second wiring screw, and the other end is connected to the rear end of the dynamic contact rod through a flexible connection, the wiring board and the static contact are respectively located on both sides of the dynamic contact rod, the opening and closing driving mechanism drives the dynamic contact rod to rotate so that the dynamic contact contacts or disconnects with the static contact, and the wiring board has a repulsion generating section located beside the dynamic contact rod and extending along the dynamic contact rod; when in a closed state, the angle θ between the repulsion generating section and the dynamic contact rod is less than 10 degrees, and the current in the repulsion generating section flows in the opposite direction to the current in the dynamic contact rod.

[0006] Furthermore, when in the disconnected state, the repulsive force generating section is parallel to the moving contact rod.

[0007] Furthermore, the moving contact rod, the stationary contact rod, and the wiring board are all strip-shaped plate structures.

[0008] Furthermore, the movable contact rod is provided with an articulated slot near the rear end, the base is provided with an articulated block, the articulated slot is mounted on the articulated block, and the movable contact rod rotates around the articulated block.

[0009] Furthermore, an arc-shaped limiting sliding block is also provided on the base, a limiting sliding groove is provided at the front end of the moving contact rod, and the limiting sliding groove is installed on the arc-shaped limiting sliding block.

[0010] Furthermore, it also includes a moving contact rod reset spring arranged on the base, and the moving contact rod reset spring acts on the moving contact rod to drive the moving contact rod to reset and disconnect.

[0011] Furthermore, the opening and closing drive mechanism includes a rotating shaft, a handle fixed to the rotating shaft, a swing arm fixed to the rotating shaft, and a connecting rod, one end of the connecting rod is hinged to the swing arm, and the other end is hinged to the front end of the moving contact rod.

[0012] Furthermore, the rotating shaft is provided with a first slot, the handle is provided with a second slot, and the opening and closing drive mechanism further comprises a connecting block for connecting the rotating shaft and the handle, and the connecting block is inserted into the first slot and the second slot at the same time.

[0013] Furthermore, the front end of the moving contact rod has a U-shaped connecting portion, and both ends of the connecting rod have connecting hooks, and one end is inserted into the U-shaped connecting portion through the connecting hook, and the other end is inserted into the hinge hole opened on the swing arm through the connecting hook.

[0014] Furthermore, it also includes an indicator member rotatably mounted on the base and connected to the opening and closing drive mechanism, the indicator member is provided with a disconnect mark and a closed mark, the base is provided with an observation window, and the opening and closing drive mechanism drives the indicator member to rotate when performing the opening and closing action, so that the disconnect mark and the closed mark are located in the observation window.

[0015] As described above, the isolating switch according to the present invention has the following beneficial effects:

[0016] By setting a conductive mechanism including a wiring board and a flexible connection, when in use, the isolating switch is connected to the circuit through the first wiring screw and the second wiring screw. When closed, the opening and closing driving mechanism drives the moving contact rod to rotate toward the static contact, so that the moving contact contacts the static contact, and the moving contact rod is always connected to the moving contact rod through the flexible connection during the swinging process. At this time, since the angle θ between the repulsion generating section and the moving contact rod is less than 10 degrees, and the current in the repulsion generating section flows in the opposite direction to the current in the moving contact rod, according to the Lorentz magnetic law, a repulsion force will be generated between the moving contact rod and the repulsion generating section, and the repulsion force will drive the moving contact rod to swing toward one side of the static contact, so that the moving contact can be further pressed against the static contact to ensure stable contact between the two, and the larger the current, the larger the repulsion force. In addition to providing pressure to close the moving and static contacts through the opening and closing driving mechanism, the isolating switch of the present invention also provides an electric repulsion force through the repulsion generating section of the wiring board to ensure the moving and static contacts are in contact when powered on, achieving double guarantees, high safety performance, simple structure, and convenient manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the isolating switch of the present invention at a certain viewing angle.

[0018] Figure 2 It is a schematic structural diagram of the isolating switch of the present invention from another viewing angle.

[0019] Figure 3 It is a front view of the isolating switch of the present invention.

[0020] Figure 4 It is a schematic diagram of the operation of the isolating switch of the present invention in a closed state.

[0021] Figure 5 It is a schematic structural diagram of the moving contact rod in the present invention.

[0022] Component number description

[0023] 1 Base

[0024] 2 First connection screw

[0025] 3 Second terminal screw

[0026] 4 Stationary contact rod

[0027] 5 Stationary contact

[0028] 6 Moving contact rod

[0029] 6a Hinge slot

[0030] 6b U-shaped connection

[0031] 7 Moving contact

[0032] 8 Terminal Block

[0033] 8a Repulsion force generation section

[0034] 9 Soft Link

[0035] 10. Handle

[0036] 10a First card slot

[0037] 11. Axis

[0038] 11a Second card slot

[0039] 12 Swing arm

[0040] 13 Connecting rod

[0041] 14 First Spring

[0042] 15 Retaining ring

[0043] 16 Connectors

[0044] 17 Second Spring

[0045] 18 Tie rod

[0046] 19 Indicator

[0047] 19a Disconnection mark

[0048] 19b Closed label

[0049] 20 Indicator drive spring

[0050] 21 Moving contact rod return spring

[0051] 22 Arc limit slider DETAILED DESCRIPTION

[0052] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0053] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0054] See also Figures 1 to 5 The present invention provides an isolating switch with stable moving and static contact points, comprising a base 1 (also called a shell), a first wiring screw 2, a second wiring screw 3, a stationary contact rod 4, a stationary contact 5 installed on the stationary contact rod 4, a moving contact rod 6, a moving contact 7 installed on the moving contact rod 6, and an opening and closing drive mechanism, wherein the stationary contact rod 4 is connected to the first wiring screw 2, and the stationary contact rod 4 and the moving contact rod 6 are all located in the base 1. The present invention also includes a conductive mechanism, which includes a terminal block 8 and a flexible connection 9. The terminal block 8 is fixed to the base 1, and the rear end of the moving contact rod 6 can be rotatably installed on the base 1. The moving contact 7 is installed at the front end of the moving contact rod 6. One end of the terminal block 8 is connected to the second wiring screw 3, and the other end is connected to the rear end of the moving contact rod 6 through the flexible connection 9. The terminal block 8 and the static contact 5 are respectively located on both sides of the moving contact rod 6. The opening and closing drive mechanism drives the moving contact rod 6 to rotate so that the moving contact 7 contacts or disconnects with the static contact 5. The terminal block 8 has a repulsion generating section 8a located beside the moving contact rod 6 and extending along the moving contact rod 6; when in the closed state, the angle θ between the repulsion generating section 8a and the moving contact rod 6 is less than 10 degrees, and the current in the repulsion generating section 8a flows in the opposite direction to the current in the moving contact rod 6.

[0055] The main working principle of the isolating switch of the present invention is as follows: when in use, the isolating switch is connected to the circuit through the first wiring screw 2 and the second wiring screw 3. When closed, the opening and closing driving mechanism drives the moving contact rod 6 to rotate toward the stationary contact 5, so that the moving contact 7 contacts the stationary contact 5, and the moving contact rod 6 is always connected to the moving contact rod 6 through the soft connection 9 during the swinging process. Figure 4 In the closed state, the current flows through the terminal block 8, the flexible connection 9, the moving contact rod 6, the moving contact 7, the static contact 5, and the static contact rod 4 in sequence. At this time, since the angle θ between the repulsive force generating section 8a and the moving contact rod 6 is less than 10 degrees, and the current in the repulsive force generating section 8a flows in the opposite direction to the current in the moving contact rod 6, see Figure 4As shown, the current flow direction in the repulsion generating section 8a is represented by direction A, and the current flow direction in the moving contact rod 6 is represented by direction B, that is, the angle between direction A and direction B is 180°-θ, and the two flow directions remain opposite. According to Lorentz's magnetic law, a repulsive force will be generated between the moving contact rod 6 and the repulsion generating section 8a, and the repulsive force will drive the moving contact rod 6 to swing toward the side of the static contact 5, so that the moving contact 7 can be further pressed against the static contact 5 to ensure stable contact between the two, and the larger the current, the larger the repulsive force, thereby avoiding the shaking or even disconnection of the moving contact 7 under large current conditions, thereby ensuring the stable closure of the isolating switch.

[0056] The isolating switch of the present invention not only provides pressure through the opening and closing drive mechanism to make the moving and static contacts 5 contact and close, but also provides electric repulsion through the repulsion generating section 8a of the terminal block 8 to ensure the moving and static contacts 5 contact when power is on, thereby achieving double guarantee, high safety performance, simple structure and easy manufacturing.

[0057] See also Figures 1 to 5 The present invention is further described below with a specific embodiment:

[0058] The position of the wiring board 8 is reasonably arranged according to the actual situation, and there is a certain distance between it and the moving contact rod 6 to provide space for the movement of the moving contact rod 6. As a preferred design, in this embodiment, see Figure 1 and Figure 3 , when in the disconnected state, the repulsive force generating section 8a is parallel to the moving contact rod 6, the two are close to each other, and there is an appropriate gap between them. When the moving contact rod 6 swings toward the stationary contact 5 to the closed state, the angle of rotation of the moving contact rod 6 is θ. In this way, when the rotation range of the moving contact rod 6 is determined, the angle θ can be minimized, thereby ensuring the maximum repulsive force. In this embodiment, see Figure 3 The terminal block 8 extends all the way to the left from the second terminal screw 3, and then turns downward, so that the front end of the repulsion force generating section 8a is as close to the static contact 5 as possible, and the rear end of the repulsion force generating section 8a is connected to the moving contact rod 6 near the rear end through the soft connection 9, so that the repulsion force generating section 8a can have a longer length as much as possible.

[0059] In this embodiment, see Figure 1 , Figure 2 and Figure 3 As a preferred design, the moving contact rod 6, the stationary contact rod 4, and the terminal block 8 are all strip-shaped plate structures, so that they can withstand large current impacts and are not prone to burning. Among them, the flexible connection 9 uses soft copper stranded wire, and the two ends can be welded to the stationary contact rod 4 and the terminal block 8 respectively. Of course, in other embodiments, the flexible connection 9 can be made of other materials or structures that can conduct electricity and ensure that the stationary contact rod 4 is always connected to the terminal block 8 during the rotation process.

[0060] In this embodiment, see Figure 1 and Figure 5 As a preferred design, a hinge slot 6a is provided near the rear end of the moving contact rod 6, and a hinge block (not shown in the drawings) is provided on the base 1. The hinge slot 6a is mounted on the hinge block to achieve hinge connection with the base 1. The moving contact rod 6 can automatically rotate around the hinge block. The above structure is convenient for the installation of the moving contact rod 6. It is only necessary to insert the hinge slot 6a of the moving contact rod 6 into the hinge block.

[0061] In this embodiment, see Figure 1 and Figure 3 As a preferred design, the base 1 is further provided with an arc-shaped limit slider 22, and the front end of the movable contact rod 6 is provided with a limit slide groove (not shown in the drawings), and the limit slide groove is mounted on the arc-shaped limit slider 22. When the movable contact rod 6 swings, its front end slides along the arc-shaped limit slider 22 through the limit slide groove to achieve stable guidance and ensure that the movable contact rod 6 can work stably. Preferably, see Figure 1 and Figure 3 , and also includes a moving contact rod reset spring 21 arranged on the base 1. The moving contact rod reset spring 21 acts on the moving contact rod 6 to drive the moving contact rod 6 to reset and disconnect. Specifically, the moving contact rod reset spring 21 adopts a torsion spring, one end of which abuts against the lower end of the moving contact rod 6, and the other end is connected to the base 1. When the moving contact rod 6 swings down toward the static contact 5, the moving contact rod reset spring 21 is compressed.

[0062] In this embodiment, see Figure 1 , Figure 2 and Figure 3 As a preferred design, the opening and closing drive mechanism includes a rotating shaft 11, a handle 10 fixed to the rotating shaft 11, a swing arm 12 fixed to the rotating shaft 11, and a connecting rod 13. One end of the connecting rod 13 is hinged to the swing arm 12, and the other end is hinged to the front end of the moving contact rod 6. By turning the handle 10, the rotating shaft 11 is driven to rotate, and the rotating shaft 11 drives the connecting rod 13 to move up and down through the swing arm 12, thereby driving the front end of the moving contact rod 6 to move, thereby driving the moving contact rod 6 to rotate around its hinge point. Preferably, in this embodiment, the front end of the moving contact rod 6 has a U-shaped connecting portion 6b, and both ends of the connecting rod 13 have connecting hooks. One end of the connecting rod 13 is inserted into the U-shaped connecting portion 6b through the connecting hook to achieve hinge connection, and the other end of the connecting rod 13 is inserted into the hinge hole on the swing wall through the connecting hook, so as to facilitate assembly. Furthermore, a first slot 10a is provided on the handle 10, and a second slot 11a is provided on the rotating shaft 11. The opening and closing drive mechanism also includes a connecting block for connecting the rotating shaft 11 and the handle 10. The connecting block is provided with a corresponding plug-in block, which can be inserted into the first slot 10a and the second slot 11a at the same time, thereby facilitating the fixed connection between the rotating shaft 11 and the handle 10.

[0063] In this embodiment, preferably, the opening and closing drive mechanism is also provided with an elastic reset structure to assist the reset and disconnection of multiple moving parts therein, the elastic reset structure includes a first spring 14 and a second spring 17, the first spring 14 is sleeved on the connecting rod 13, a connecting block is fixed on the swing arm 12, and a retaining ring 15 fixed to the base 1 is provided, the lower end of the connecting rod 13 (the end close to the moving contact rod 6) passes through the retaining ring 15, the upper end of the first spring 14 is abutted or connected to the connecting member 16, and the lower end is abutted or connected to the retaining ring 15, the second spring 17 is a torsion spring, which is installed on the base 1, one end of which is hinged to the handle 10, and the other end is hinged to the base 1, so that when the handle 10 is closed, the second spring 17 will be compressed, and when the swing arm 12 drives the connecting rod 13 to move downward, the first spring 14 will be compressed by the connecting member 16, so that when the disconnection operation is performed, the second spring 17 will assist the handle 10 to reset, and the first spring 14 will assist the connecting rod 13 and the swing arm 12 to reset and disconnect. Of course, the opening and closing drive mechanism is not limited to the above structure. In other embodiments, the opening and closing drive mechanism can also adopt an existing conventional structure to drive the moving contact rod 6 to move and realize the closing and opening of the moving and static contacts 5.

[0064] In this embodiment, see Figure 1 , Figure 2 and Figure 3 As a preferred design, the isolating switch also includes an indicator 19 rotatably mounted on the base 1 and connected to the opening and closing drive mechanism. The indicator 19 is provided with a disconnection mark 19a and a closing mark 19b. The disconnection mark 19a and the closing mark 19b can be colors or texts, etc. The base 1 is provided with an observation window (not shown in the drawings). The observation window can be a closed glass window to prevent dust from entering. When the opening and closing drive mechanism performs the opening and closing action, it drives the indicator 19 to rotate, so that the disconnection mark 19a and the closing mark 19b are located in the observation window, which is used to indicate whether the isolating switch is in the disconnected state or the closed state at this time.

[0065] In this embodiment, see Figure 1 , Figure 2 and Figure 3 Preferably, the indicator 19 is connected to the connecting member 16 in the opening and closing drive mechanism through a pull rod 18, one end of the pull rod 18 is hinged on the connecting member 16, and the other end is inserted into a linear slide groove arranged on the base 1 and can extend into the lower end of the connecting member 16. It also includes an indicator drive spring 20, which is a torsion spring and is installed on the base 1. One end of the indicator 19 is hinged on the base 1, and the other end is hinged on the base 1. When the isolating switch is disconnected, refer to Figure 3, the connecting member 16 drives the pull rod 18 to slide, and the right side of the pull rod 18 slides to the right in the linear slide groove until it abuts against the lower end of the indicator 19, so that the indicator 19 rotates upward until the closing mark 19b is located in the observation window. At this time, the indicator drive spring 20 is compressed. When performing the closing operation, the connecting member 16 drives the pull rod 18 to move, and the right end of the pull rod 18 moves to the left in the linear slide groove and leaves the lower end of the indicator 19. At this time, the elastic force of the indicator drive spring 20 drives the indicator 19 to rotate downward until the disconnection mark 19a is located in the observation window.

[0066] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An isolating switch with stable moving and static contact points, comprising a base (1), a first wiring screw (2), a second wiring screw (3), a stationary contact rod (4), a stationary contact (5) mounted on the stationary contact rod (4), a moving contact rod (6), a moving contact (7) mounted on the moving contact rod (6), and a switch drive mechanism, wherein the stationary contact rod (4) is connected to the first wiring screw (2), and is characterized in that: The invention also comprises a conductive mechanism, the conductive mechanism comprising a wiring board (8) and a flexible connection (9), the wiring board (8) being fixed to the base (1), the rear end of the movable contact rod (6) being rotatably mounted on the base (1), the movable contact (7) being mounted on the front end of the movable contact rod (6), one end of the wiring board (8) being connected to the second wiring screw (3), and the other end being connected to the rear end of the movable contact rod (6) through the flexible connection (9), the wiring board (8) and the stationary contact (5) being respectively located on both sides of the movable contact rod (6), the opening and closing driving mechanism driving the movable contact rod (6) to rotate so that the movable contact (7) and the stationary contact (5) are in contact or disconnected, the wiring board (8) having a repulsive force generating section (8a) being located beside the movable contact rod (6) and extending along the movable contact rod (6); when in a closed state, the angle θ between the repulsive force generating section (8a) and the movable contact rod (6) is less than 10 degrees, and the current in the repulsive force generating section (8a) is in direct contact with the movable contact rod (6) ) in opposite directions of current flow; when in the disconnected state, the repulsive force generating section (8a) is parallel to the moving contact rod (6); the moving contact rod (6), the stationary contact rod (4), and the terminal block (8) are all strip-shaped plate structures; the opening and closing drive mechanism comprises a rotating shaft (11), a handle (10) fixedly connected to the rotating shaft (11), a swing arm (12) fixedly connected to the rotating shaft (11), and a connecting rod (13), one end of the connecting rod (13) being hinged to the swing arm (12) and the other end being hinged to the front end of the moving contact rod (6); and also comprises an indicator (19) rotatably mounted on the base (1) and connected to the opening and closing drive mechanism, the indicator (19) being provided with a disconnection mark (19a) and a closing mark (19b), the base (1) being provided with an observation window, and the opening and closing drive mechanism drives the indicator (19) to rotate when performing an opening and closing action, so that the disconnection mark (19a) and the closing mark (19b) are located in the observation window.

2. The isolating switch according to claim 1, characterized in that: The movable contact rod (6) is provided with a hinge slot (6a) near the rear end, the base (1) is provided with a hinge block, the hinge slot (6a) is mounted on the hinge block, and the movable contact rod (6) rotates around the hinge block.

3. The isolating switch according to claim 1, characterized in that: The base (1) is also provided with an arc-shaped limit sliding block (22), the front end of the movable contact rod (6) is provided with a limit sliding groove, and the limit sliding groove is installed on the arc-shaped limit sliding block (22).

4. The isolating switch according to claim 1, characterized in that: It also includes a moving contact rod reset spring (21) arranged on the base (1), wherein the moving contact rod reset spring (21) acts on the moving contact rod (6) and is used to drive the moving contact rod (6) to reset and disconnect.

5. The isolating switch according to claim 1, characterized in that: The rotating shaft (11) is provided with a first slot (10a), the handle (10) is provided with a second slot (11a), and the opening and closing drive mechanism further comprises a connecting block for connecting the rotating shaft (11) and the handle (10), the connecting block being inserted into the first slot (10a) and the second slot (11a) at the same time.

6. The isolating switch according to claim 1, characterized in that: The front end of the movable contact rod (6) has a U-shaped connecting portion (6b), and both ends of the connecting rod (13) have connecting hooks, with one end being inserted into the U-shaped connecting portion (6b) through the connecting hook, and the other end being inserted into a hinge hole provided on the swing arm (12) through the connecting hook.

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