Three-position switch transmission mechanism

Abstract

The utility model discloses a three-position switch transmission mechanism which is a hinge four-bar mechanism composed of an operating mechanism output crank arm, a connecting rod, a three-position switch output crank arm and a rack, when the horizontal distance between the rotating axis of the operating mechanism output crank arm and the rotating axis of a three-position switch output shaft is 59mm and the vertical distance between the operating mechanism output crank arm and the rotating axis of the three-position switch output shaft is 165mm, the length of the operating mechanism output crank arm is 81mm, and the length of the connecting rod is 81mm. The initial rotation angle is 7 degrees; the length of an output crank arm of the three-position switch is 92 mm, and the initial rotation angle of the output crank arm is 27 degrees; the length of the connecting rod is 166 mm, and the included angle between the center line of the three-position switch at the grounding position and the center line of the output crank arm of the three-position switch at the grounding position is 63 degrees. According to the utility model, the double-locking function of the three-position switch at the closing position and the grounding position is realized, the contact is ensured not to be passively separated when the three-position switch is at the closing position and the grounding position, the operation safety is improved, and the three-position switch can meet the performance requirements of electrical appliances at the closing position, the isolating position and the grounding position.

Description

TECHNICAL FIELD

[0001] The utility model relates to a three-position switch drive mechanism. BACKGROUND

[0002] Three-position switch is an important equipment in power supply system, commonly used in hub station, electric phase separation, traction substation and other occasions, its function is to connect or cut off the circuit between power supply sections, improve the flexibility of power supply, realize the switching of single and double power supply. In the case of no load, the electrical equipment of power supply circuit can be cut off or closed by controlling the three-position switch, and at the same time in the process of maintenance, the three-position switch can be safely grounded to meet the needs of various maintenance.

[0003] Three-position switch has three positions: closed position, isolation (open) position and grounding position. The closed position connects the circuit and carries current; the isolation position isolates the power supply and forms an obvious break; the grounding position releases residual charge and maintains zero potential grounding protection. This requires that the operating mechanism of three-position switch also has three positions: closed position, isolation position and grounding position. In order to meet the requirements of electrical performance of three-position switch in each position, whether the design of three-position switch drive mechanism is reasonable is particularly important:

[0004] (1) When the three-position switch is in the closed position, it not only needs to carry the rated current, but also needs to carry the rated short-time withstand current and the rated peak withstand current at any time, which requires that the contact finger of the three-position switch has good cooperation with the static contact, that is, all the contact fingers of the three-position switch reach 100% contact with the conductive plane of each static contact.

[0005] (2) When the three-position switch is in the grounding position, it needs to ground the three-phase short circuit, which has two functions: one is to release the residual charge on the power line and power equipment to the ground; the other is to keep the power line and power equipment at zero potential, which also requires that the moving contact of the three-position switch has good cooperation with the static contact, that is, all the contact fingers of the moving contact reach 100% contact with the conductive plane of the static contact, and some places may also need to carry the rated short-time withstand current and the rated peak withstand current.

[0006] (3) When the three-position switch is in the open position, it must be reliably isolated from the power supply to form an obvious break, so as to prevent the power supply from being turned on in the case of misoperation or overvoltage, so as to ensure the safety of maintenance personnel and equipment; there must be enough distance and reliable insulation between the moving contact and the static contact after disconnection to ensure the isolation function under various conditions and prevent insulation breakdown in the case of overvoltage and interphase flashover. If the gas gap between the moving contact and the static contact is too small, it may cause voltage breakdown of the gas gap and discharge, even connect the power supply to cause personal safety accidents and equipment damage accidents.

[0007] The dynamic thermal stability requirements from the rated short-time withstand current and the rated peak withstand current, and the shocks / vibrations and impacts from the nature all hope that the three-position switch has necessary protection measures in the closing position, the isolation (opening) position and the grounding position to prevent misoperation and cause accidents, especially in the closing position and the grounding position, the impacts from the short-time withstand current and the rated peak withstand current are the biggest test for the safe operation of the three-position switch. Content of the utility model

[0008] The utility model discloses a kind of three-position switch transmission mechanisms, so that three-position switch in closing position, isolation position and grounding position can meet the requirement of its electrical performance.

[0009] The utility model discloses a kind of three-position switch transmission mechanisms, so that three-position switch in closing position, isolation position and grounding position can meet the requirement of its electrical performance.

[0010] The utility model discloses a kind of three-position switch transmission mechanisms, so that three-position switch in closing position, isolation position and grounding position can meet the requirement of its electrical performance.

[0011] Compared with the prior art, the utility model has the following remarkable effects:

[0012] (1) the utility model can realize the double locking function of three-position switch in closing position, grounding position, ensure that contact is not passive separation when three-position switch is in closing position and grounding position, improve the safety of operation, so that three-position switch in closing position, isolation position and grounding position can meet the requirement of its electrical performance.

[0013] (2) three position switch in the grounding position, for the specific embodiment of the example, the angle between the output crank of operating mechanism and connecting rod is 3°, at this time, as long as the output crank of operating mechanism is locked and no longer rotates clockwise, the three position switch itself will not separate the moving contact and static contact under the action of positive or reverse external force (here mainly refers to the impact force of electric power, vibration), ensuring that the three position switch is in the grounding position and the contact is not separated passively, improving the safety of operation; that is, only when the output crank of operating mechanism rotates counterclockwise under the action of human power and external force, the three position switch can be operated.

[0014] (2) three position switch in the grounding position, for the specific embodiment of the example, the angle between the output crank of operating mechanism and connecting rod is 3°, at this time, as long as the output crank of operating mechanism is locked and no longer rotates clockwise, the three position switch itself will not separate the moving contact and static contact under the action of positive or reverse external force (here mainly refers to the impact force of electric power, vibration), ensuring that the three position switch is in the grounding position and the contact is not separated passively, improving the safety of operation; that is, only when the output crank of operating mechanism rotates counterclockwise under the action of human power and external force, the three position switch can be operated.

[0015] (2) three position switch in the grounding position, for the specific embodiment of the example, the angle between the output crank of operating mechanism and connecting rod is 3°, at this time, as long as the output crank of operating mechanism is locked and no longer rotates clockwise, the three position switch itself will not separate the moving contact and static contact under the action of positive or reverse external force (here mainly refers to the impact force of electric power, vibration), ensuring that the three position switch is in the grounding position and the contact is not separated passively, improving the safety of operation; that is, only when the output crank of operating mechanism rotates counterclockwise under the action of human power and external force, the three position switch can be operated. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0017] Figure 1 is the side view of three position switch, transmission mechanism and operating mechanism;

[0018] Figure 2 is the front view of three position switch, transmission mechanism and operating mechanism;

[0019] Figure 3 is the schematic view of three position switch in the grounding position;

[0020] Figure 4 is the schematic view of three position switch in the grounding position;

[0021] Figure 5 is the schematic view of three position switch in the grounding position;

[0022] Figure 6 is the schematic view of three position switch in the grounding position;

[0023] Figure 7 This is a schematic diagram simulating motion design of transmission mechanism parameters;

[0024] Figure 8 This is a schematic diagram illustrating an example of designing the grounding position parameters for a transmission mechanism.

[0025] Figure 9 This is a schematic diagram illustrating an example of designing the opening position parameters of a transmission mechanism;

[0026] Figure 10 This is a schematic diagram illustrating an example of designing the closing position parameters of a transmission mechanism;

[0027] Figure 11 This is a schematic diagram illustrating an example of designing and locking the grounding position parameters of a transmission mechanism.

[0028] Figure 12 This is a schematic diagram illustrating an example of designing and locking the closing position parameters of a transmission mechanism.

[0029] In the diagram: 1-Three-position switch, 11-Contact finger, 2-Transmission mechanism, 3-Operating mechanism, 4-Ground stationary contact, 5-Close stationary contact, 6-Crank, 7-Frame, 8-Rocker, 9-Connecting rod, 10-Locking pin, O1-Operating mechanism output crank arm rotation axis, O2-Three-position switch output crank arm rotation axis, L-Horizontal distance, H-Vertical distance, L1-Grounding break, L2-Isolation break, L3-Center line of three-position switch, α-Initial angle of crank rotation, β-Initial angle of rocker rotation. Detailed Implementation

[0030] like Figure 11 , Figure 12 As shown, this utility model discloses a three-position switch transmission mechanism, which is a hinged four-bar linkage consisting of an operating mechanism output crank arm (crank 6), a connecting rod 9, a three-position switch output crank arm (rocker 8), and a frame 7. When the horizontal distance between the rotation axis O1 of the operating mechanism output crank arm and the rotation axis O2 of the three-position switch output shaft is 59mm and the vertical distance is 165mm, the length of the operating mechanism output crank arm is 81mm, and its initial rotation angle is 7°; the length of the three-position switch output crank arm is 92mm, and its initial rotation angle is 27°; the length of the connecting rod 9 is 166mm, and the angle between the center line of the three-position switch at the ground position and the center line of the three-position switch output crank arm at the ground position is 63°.

[0031] This invention uses a parameter design method for a three-position switch transmission mechanism with double locking to calculate the parameters of the transmission mechanism, which are determined by this method as follows:

[0032] (1) The length of the crank arm output by the operating mechanism and its initial position of rotation;

[0033] (2) The length of the output crank of the three-position switch and the initial position of the rotation thereof;

[0034] (4) The length of the connecting rod between the output crank of the three-position switch and the output crank of the operating mechanism;

[0035] (5) The angle between the center line of the three-position switch at the grounding position and the center line of the output crank of the three-position switch at the grounding position.

[0036] As shown in Figure 3 , Figure 4 , Figure 5 , the three-position switch 1 is respectively at the grounding position, the open position and the closed position, according to the electrical gap requirement of the three-position switch 1, it is confirmed that the electrical gap between the grounding breaking point L1 and the isolation breaking point L2 of the three-position switch 1 is about 75 mm (that is, 75 mm ± 3 mm, which is a maximum control value, and in actual design, other factors also affect the electrical gap, so the 75 mm without tolerance is not marked below), when all the contact fingers of the three-position switch 1 reach 100% contact with the conductive plane of each static contact, the center line L3 of the three-position switch 1 rotates from the grounding position to the isolation position, and the rotation angle is 65°, and vice versa; the center line L3 of the three-position switch 1 rotates from the isolation position to the closed position, and the rotation angle is 60°, and vice versa.

[0037] The rotation center O2 of the output shaft of the three-position switch and the rotation center of the output crank of the three-position switch are the same center, and rotate synchronously with the three-position switch 1, that is, the output crank of the three-position switch rotates from the grounding position to the isolation position, and the rotation angle is 65°, and vice versa; the output crank of the three-position switch rotates from the isolation position to the closed position, and the rotation angle is 60°, and vice versa.

[0038] It is known that the operating mechanism 3 can be intermittently rotated forward and backward twice, each time by 90°, and the operating sequence is the same as required by the three-position switch.

[0039] As shown in Figures 1 to 12 , the utility model includes the following steps:

[0040] S1, referring to Figure 1 , Figure 2 , the three-position switch 1, the transmission mechanism 2 and the operating mechanism 3 are shown in the figure, the relative installation position of the three-position switch 1 and the operating mechanism 3 is determined according to the structure layout, the horizontal distance L and the vertical distance H between the rotation center O1 of the output crank of the operating mechanism 3 and the rotation center O2 of the output shaft of the three-position switch 1 are confirmed, and the distance parameters are obtained; in this embodiment, the horizontal distance L is 59 mm, and the vertical distance H is 165 mm;

[0041] S2, as shown in Figure 6 , Figure 7As shown, draw the output crank arm rotation axis center (the same as the operation mechanism output shaft rotation axis center) O1 of the operating mechanism 3 and the output shaft rotation axis O2 of the three-position switch 1 on the drawing by CAD drawing software or on paper;

[0042] S3, draw the center line L3 of the three-position switch 1 with the output shaft rotation axis O2 as the center, the included angle between the closing position and the isolation position is 65°, and the included angle between the isolation position and the grounding position is 60°; that is, the center line of the three-position switch output crank arm is drawn, the included angle between the closing position and the isolation position is 65°, and the included angle between the isolation position and the grounding position is 60°;

[0043] S4, according to the positions of the three-position switch output crank arm and the operating mechanism output crank arm, and in the case of simultaneously meeting the grounding position, the isolation position and the closing position, design the transmission mechanism (hinged four-bar mechanism);

[0044] Connect the operating mechanism 3 output shaft rotation axis O1 and the three-position switch 1 output shaft rotation axis O2, the connecting line O1-O2 is the rack 7 of the transmission mechanism, and the hinged points at both ends of the rack 7 are taken as the center, the X1 axis and the Y1 axis are taken as the boundary, and the rectangular coordinate system I is established; the X2 axis and the Y2 axis are taken as the boundary, and the rectangular coordinate system II is established;

[0045] S5, take the center of the rectangular coordinate system I as the center, try to take the length r1=81 of the crank 6 (operating mechanism output crank arm) as the radius to draw a circle, and at the lower end of the crank 6 in the third quadrant of the rectangular coordinate system I, the crank 6 rotates clockwise twice with an initial angle α=7°, each time rotating 90°, and the crank 6 intersects the circumferential line of the circle at intersection points A1, B1 and C1;

[0046] S6, take the center of the rectangular coordinate system II as the center, take the length r2=92 of the rocker 8 (three-position switch output crank arm) as the radius to draw a circle, and at the lower end of the rocker 8 in the third quadrant of the rectangular coordinate system II, the rocker 8 rotates clockwise twice with an initial angle β=27°, the first time rotates 65°, and the second time rotates 60°, and the rocker 8 intersects the circumferential line of the circle at intersection points A2, B2 and C2;

[0047] According to the rack position, the crank rotates 90° each time, the rocker rotates about 60-65° each time, the rocker length is greater than the crank length; the connecting rod is fixed length, the starting position of the crank should be at the lower end of the third quadrant of the rectangular coordinate system I, and the limit position should be at the central axis Y1 of the third and fourth quadrants of the rectangular coordinate system I; similarly, the starting position of the rocker should be at the lower end of the third quadrant of the rectangular coordinate system II, and the limit position should be at the central axis Y2 of the third and fourth quadrants of the rectangular coordinate system II; based on the above judgment, a length of the crank and an initial angle at the lower end of the third quadrant are preliminarily tried; a length of the rocker and an initial angle at the lower end of the third quadrant are preliminarily tried, and it is confirmed that the rocker length is greater than the crank length.

[0048] S7, corresponding to the connection intersection A1, B1, C1 and intersection A2, B2, C2, forming A1-A2, B1-B2, C1-C2 three segment lines (the connecting line of the output crank arm end of the operating mechanism and the output crank arm end of the three-position switch, that is, the connecting rod 9), respectively measuring the length of the connecting rod 9;

[0049] If the lengths of the three segment lines A1-A2, B1-B2, C1-C2 differ within the set range, the set range is 0-2mm, the designed transmission mechanism is established, and step S8 is entered; otherwise, the length r1 of the crank, the initial angle α of the crank rotation, the length r2 of the rocker and the initial angle β of the rocker rotation are taken again, and steps S5-S7 are repeated until the lengths of the three segment lines A1-A2, B1-B2, C1-C2 differ within the set range, the set range is 0-2mm, and step S8 is entered;

[0050] In the embodiment, the length of the A1-A2 connecting line is 165.656mm, the length of the B1-B2 connecting line is 165.297mm, and the length of the C1-C2 connecting line is 165.941mm, the lengths of the three segment lines are approximately equal, that is, the length of the connecting rod 9, and the designed transmission mechanism is established;

[0051] S8, confirming that the included angle between the center line of the three-position switch at the grounding position and the center line of the rocker at the grounding position is 63°;

[0052] S9, using the confirmed parameters, verifying that the electrical gap between the isolation breaking gap L2 and the grounding breaking gap L1 of the three-position switch is 75mm, if the verification is successful, it is determined that the parameters meet the double locking of the three-position switch transmission mechanism; otherwise, according to steps S1-S8, the design is re-optimized until the electrical gap between the isolation breaking gap and the grounding breaking gap of the three-position switch is 75mm, and the parameters meeting the double locking of the three-position switch transmission mechanism are determined.

[0053] Referring to Figures 8 to 10 , respectively showing the parameter design of the transmission mechanism at the grounding position, the opening position and the closing position; Figure 11 andFigure 12 The transmission mechanism is locked in the ground position and the closing position respectively, and the operating mechanism output crank is locked by the locking pin 10.

[0054] In the embodiment, the electrical clearance between the three-position switch isolation gap and the ground gap is verified to be 75mm using the confirmed parameters, and the parameters of the transmission mechanism are confirmed as follows:

[0055] (1) The length of the operating mechanism output crank is 81mm, and the initial angle of rotation is 7°;

[0056] (2) The length of the three-position switch output crank is 92mm, and the initial angle of rotation is 27°;

[0057] (3) The length of the connecting rod between the three-position switch output crank and the operating mechanism output crank is 166mm;

[0058] (4) The included angle between the center line of the three-position switch in the ground position and the center line of the three-position switch output crank in the ground position is 63°.

[0059] The embodiment is one of the optimal parameter combinations under the overall structure scheme of the three-position switch, that is, when the horizontal distance and the vertical distance between the rotating axis O1 of the operating mechanism output crank and the rotating axis O2 of the three-position switch output crank are 59mm and 165mm, the main target is to realize the double locking function of the transmission mechanism under specific conditions.

[0060] The design of the four-bar mechanism of the transmission mechanism of the utility model, especially when the three positions are conditionally limited, the length of the connecting rod is difficult to reach the ideal state (that is, equal), and in actual application, the connecting rod is one, and in general cases, the angle or the electrical clearance will change, but the change does not affect the product performance (or within the design tolerance range, it is acceptable).

[0061] In actual drawing, the relevant length and angle of the utility model can be accurate to two decimal places, and the design allowance when the moving contact of the three-position switch and each static contact reach 100% contact and the design allowable deviation can be considered.

Claims

1. A three-position switch transmission mechanism which is a hinge four-bar mechanism composed of an operating mechanism output crank, a connecting rod, a three-position switch output crank, and a frame, characterized in that: When the horizontal distance between the rotation axis O1 of the operating mechanism output crank and the rotation axis O2 of the three-position switch output shaft is 59 mm and the vertical distance is 165 mm, the length of the operating mechanism output crank is 81 mm, the length of the three-position switch output crank is 92 mm, and the length of the connecting rod is 166 mm.

2. The triple position switch gear mechanism of claim 1, wherein: The initial angle of rotation of the operating mechanism output crank is 7°.

3. The triple position switch gear mechanism of claim 2, wherein: The initial angle of rotation of the three-position switch output crank is 27°.

4. The triple position switch gear mechanism of claim 3, wherein: The included angle between the center line of the three-position switch in the grounding position and the center line of the three-position switch output crank in the grounding position is 63°.

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