Free tripping structure for rotary disconnecting switch

Abstract

The utility model belongs to the technical field of low-voltage switches, and particularly relates to a free tripping structure for a rotary disconnecting switch, the rotary disconnecting switch comprises a knob and a switch assembly composed of a plurality of switch units, and the free tripping structure is connected between the knob and the switch assembly; the free tripping structure comprises a mechanism support and a multi-connecting-rod mechanism with an energy storage piece, the multi-connecting-rod mechanism with the energy storage piece comprises an output connecting rod, the output connecting rod is in hinged fit with the mechanism support through a first hinged shaft, the output connecting rod is provided with an output part in transmission fit with the switch assembly, and the output connecting rod rotates around a point D and has a switching-off position and a switching-on position. And a first power-assisted elastic piece is connected between the output connecting rod and the mechanism bracket. On the basis of an existing free tripping structure, the first power-assisted elastic piece is arranged for the output connecting rod located at the transmission tail end of the multi-connecting-rod mechanism, the opening and closing force output by the multi-connecting-rod mechanism can be freely adjusted through the first power-assisted elastic piece, and the opening and closing action of the switch is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage switches, and particularly relates to a free tripping structure for a rotary disconnector. Background Art

[0002] The free tripping device, including a five-link mechanism, is generally used in molded case circuit breakers to realize opening and closing operations and free tripping opening for purposes such as short-circuit instantaneous protection and overload protection. And during this action process, it is not associated with the operating handle to ensure safe and controllable opening control.

[0003] The rotary disconnector generally includes a switch assembly composed of a knob and a plurality of switch units stacked in layers. In the prior art, such as the structure disclosed in patent CN 202220055056.7, the free tripping mechanism previously used in molded case circuit breakers is applied to the rotary disconnector to realize the power transmission from the knob to the moving contact in the switch assembly and the free tripping opening that needs to disengage from the knob. The contact of the rotary disconnector rotates at a large angle during the opening and closing actions, mostly above 90°. The opening and closing forces required for the switch units stacked in layers are relatively large, and the opening and closing forces output by the free tripping device rely on the energy storage spring of the free tripping device driven by the knob. The calculation of the actual opening and closing forces of the free tripping mechanism is relatively complex, and it is difficult to design a free tripping mechanism that matches the opening and closing forces required by the stacked switch units. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the disadvantages and deficiencies existing in the prior art, and provide a free tripping structure for a rotary disconnector.

[0005] The technical solution adopted by the utility model is as follows: a free tripping structure for a rotary disconnector, the rotary disconnector includes a switch assembly composed of a knob and several switch units, and the free tripping structure is connected between the knob and the switch assembly;

[0006] The free tripping structure includes a mechanism bracket and a multi-link mechanism with an energy storage member. The multi-link mechanism with an energy storage member includes an output link. The output link is hinged and matched with the mechanism bracket through a first hinge shaft with point D as the axis. The output link is provided with an output part that is in transmission cooperation with the switch assembly. The output link rotates around point D and has an opening position and a closing position. A first assisting elastic member is connected between the output link and the mechanism bracket.

[0007] The first assisting elastic member is a torsion spring, including a fixed ring, a free end and a limiting end extending from the fixed ring. The fixed ring is sleeved on the first hinge shaft, and the free end and the limiting end are respectively abutted against the output link and the mechanism bracket.

[0008] The output connecting rod is formed by bending an integral plate, and has two parallel hinge plates and an acting plate connected between the two hinge plates. The hinge plate is provided with a first hinge hole for the first hinge shaft to pass through. The first boosting elastic member is arranged between the two hinge plates and its free end abuts against the acting plate;

[0009] The mechanism bracket has two relatively parallel mechanism side plates, and the two mechanism side plates are connected and fixed by a plurality of connecting columns, and the limiting end abuts against one of the connecting columns.

[0010] The first boosting elastic member forms an elastic acting force on the output connecting rod towards the opening position.

[0011] The mechanism bracket is provided with a limiting block cooperating with the output connecting rod corresponding to the opening position of the output connecting rod.

[0012] The first hinge shaft is in circumferential linkage cooperation with the output connecting rod, and one end or both ends of the first hinge shaft extend out of the mechanism bracket to form an output part.

[0013] The multi-link mechanism with an energy storage member includes an upper connecting rod, a lower connecting rod, an input arm, a jumping fastener, and an energy storage spring. The jumping fastener is hinged to the mechanism bracket through a second hinge shaft with O as the axis. The jumping fastener is hinged to the upper connecting rod through a third rotating shaft with A as the axis. The upper connecting rod is hinged to the lower connecting rod through a fourth rotating shaft with B as the axis. The lower connecting rod is hinged to the output connecting rod through a fifth rotating shaft with C as the axis;

[0014] It further includes a locking fastener. The jumping fastener and the locking fastener cooperate to have a latched state and an unlatched state of the jumping fastener. When the two are in the latched state, the jumping fastener is non-rotatable relative to O and is in an energy storage position for storing energy in the energy storage spring. When the two are in the unlatched state, the jumping fastener is rotatable relative to O and the energy storage spring can release energy. The rotation of the jumping fastener relative to O has an unlatched opening position corresponding to the complete release of energy of the energy storage spring and the switch assembly being in the opening state.

[0015] A second boosting elastic member is arranged between the jumping fastener and the mechanism bracket, and the second boosting elastic member forms an elastic acting force on the jumping fastener towards the unlatched opening position.

[0016] The second boosting elastic member is a tension spring.

[0017] The energy storage spring is a tension spring, and its two ends are respectively connected to a connecting shaft fixed on the input arm and the fourth rotating shaft with B as the axis.

[0018] The beneficial effects of the present utility model are as follows: Based on the existing free tripping structure, a first boosting elastic member is provided for the output connecting rod at the transmission end of the multi-link mechanism. The first boosting elastic member can freely adjust the closing and opening forces output by the multi-link mechanism, making the closing and opening actions of the switch more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present utility model.

[0020] Figure 1 An exploded view of an embodiment of the present utility model;

[0021] Figure 2 A partial schematic view of the mating structure between the output connecting rod and the mechanism support after hiding one mechanism side plate in an embodiment of the present utility model;

[0022] Figure 3 A schematic view of the structure of the output connecting rod in an embodiment of the present utility model;

[0023] Figure 4 A schematic view of the structure of an embodiment of the present utility model in the normal opening state;

[0024] Figure 5 A schematic view of the structure of an embodiment of the present utility model in the normal closing state;

[0025] Figure 6 A schematic view of the structure of an embodiment of the present utility model in the tripped opening state;

[0026] In the figure, mechanism side plate - 101, connecting column - 102, limit block - 103, upper connecting rod - 2, lower connecting rod - 3, output connecting rod - 4, hinge plate - 401, acting plate - 402, first hinge hole - 403, first boosting elastic member - 5, fixing ring - 501, free end - 502, limit end - 503, tripping buckle - 6, locking buckle - 7, energy storage spring - 8, second boosting elastic member - 9, input arm - 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will further describe the present utility model in detail with reference to the drawings.

[0028] It should be noted that all the expressions using "first" and "second" in the embodiments of the present utility model are for distinguishing two entities or parameters with the same name but different, so it can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present utility model. This will not be elaborated one by one in the subsequent embodiments.

[0029] The terms of direction and position mentioned in the present utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only with reference to the direction or position of the attached drawings. Therefore, the terms of direction and position used are for explaining and understanding the present utility model, rather than a limitation on the protection scope of the present utility model.

[0030] A free tripping structure for a rotary disconnector, the rotary disconnector includes a knob and a switch assembly composed of a plurality of switch units, and the free tripping structure is connected between the knob and the switch assembly;

[0031] As Figure 1 shown, the free tripping structure includes a mechanism bracket and a multi-link mechanism with an energy storage member. The mechanism bracket has two relatively parallel mechanism side plates 101, and the two mechanism side plates 101 are connected and fixed by a plurality of connecting columns 102. The multi-link mechanism with an energy storage member is installed between the two mechanism side plates 101, and specifically includes an upper link 2, a lower link 3, an output link 4, an input arm 10, a tripping member 6, and an energy storage spring 8. The tripping member 6, the upper link 2, the lower link 3, and the output link 4 are sequentially hinged. The tripping member 6 cooperates with a locking member 7. When the tripping member 6 is latched with the locking member 7, the tripping member 6 cannot move. The upper link 2, the lower link 3, and the output link 4 form a four-link mechanism. Through the action switching of the four-link mechanism, the opening and closing actions are realized. And at this time, the energy storage spring 8 stores energy. When the tripping member 6 is unlatched from the locking member 7, the tripping member 6 can move freely. The tripping member 6, the upper link 2, the lower link 3, and the output link 4 form a five-link mechanism, and the energy storage spring 8 releases energy to realize tripping and opening.

[0032] As Figure 2 shown, on the basis of the free tripping structure in this embodiment, a first assisting elastic member 5 is connected between the output link 4 and the mechanism bracket. When the output link 4 rotates and switches positions between the opening position and the closing position, the first assisting elastic member 5 completes energy storage / energy release to realize the adjustment of the opening and closing forces. Therefore, in this embodiment, the opening and closing forces output by the free tripping structure can be freely adjusted.

[0033] Specifically, the output connecting rod 4 is hinged to the mechanism bracket through a first hinge shaft with point D as the axis. The output connecting rod 4 is provided with an output part in transmission cooperation with the switch assembly. The output connecting rod 4 rotates around point D and has a tripping position and a closing position. The first boosting elastic member 5 is a torsion spring, including a fixing ring 501, a free end 502 and a limiting end 503 extending from the fixing ring 501. The fixing ring 501 is sleeved on the first hinge shaft, and the free end 502 and the limiting end 503 are respectively abutted against the output connecting rod 4 and the mechanism bracket.

[0034] As Figure 3 shown, the output connecting rod 4 of this embodiment includes a hinge plate 401 and an acting plate 402. The hinge plate 401 and the acting plate 402 are bent and connected. The hinge plate 401 is provided with a first hinge hole 403 for the first hinge shaft to pass through; the first boosting elastic member 5 forms an elastic acting force on the output connecting rod 4 tending to the tripping position. Specifically, the output connecting rod 4 is formed by bending an integral plate, having two parallel hinge plates 401 and an acting plate 402 connected between the two hinge plates 401. The first boosting elastic member 5 is arranged between the two hinge plates 401. The free end 502 abuts against the acting plate 402, and the limiting end 503 abuts against one of the connecting columns 102.

[0035] In addition, the mechanism bracket is provided with a limiting block 103 cooperating with the output connecting rod 4 corresponding to the tripping position of the output connecting rod 4.

[0036] The first hinge shaft is in circumferential linkage cooperation with the output connecting rod 4. One end or both ends of the first hinge shaft extend out of the mechanism bracket to form an output part. The first hinge shaft is a cylinder with two cut surfaces. The shape of the first hinge hole 403 is adapted to the shape of the first hinge shaft, so as to form a linkage cooperation. The through hole of the mechanism bracket for the first hinge shaft to pass through is a round hole. Therefore, the first hinge shaft can rotate relative to the mechanism bracket.

[0037] Specifically, the tripping fastener 6 is hinged to the mechanism bracket through a second hinge shaft with point O as the axis. The tripping fastener 6 is hinged to the upper connecting rod 2 through a third rotating shaft with point A as the axis. The upper connecting rod 2 is hinged to the lower connecting rod 3 through a fourth rotating shaft with point B as the axis. The lower connecting rod 3 is hinged to the output connecting rod 4 through a fifth rotating shaft with point C as the axis. The output connecting rod 4 is hinged to the mechanism bracket through a first hinge shaft with point D as the axis. The energy storage spring 8 is a tension spring, and its two ends are respectively connected to the connecting shaft fixed on the input arm 10 and the fourth rotating shaft with point B as the axis. Figure 4 、 Figure 5They are respectively the structural schematic diagrams of this embodiment in normal opening and normal closing states. When in normal closing - normal opening, the position of the jump fastener 6 is fixed and cannot rotate, forming a four-bar linkage of AB - BC - CD - DA where points A and D are stationary and points B and C are movable. The input arm 10 rotates, pulling point B through the energy storage spring 8, and the AB - BC - CD - DA four-bar linkage Figure 4 switches between the quadrilateral shape shown in Figure 5 and the quadrilateral shape shown in Figure 6 to perform the opening and closing actions. CD rotates to output the opening and closing actions. When the locking fastener 7 rotates and disengages from the jump fastener 6, the jump fastener 6 can rotate relative to the mechanism bracket, forming a five-bar linkage of OA - AB - BC - CD - DO where points O and D are stationary and points A, B, and C are movable. The energy storage spring 8 releases energy, and the OA - AB - BC - CD - DO five-bar linkage acts to achieve opening, forming a pentagon shape as shown in

[0038] In this embodiment, a second boosting elastic member 9 is additionally provided between the jump fastener 6 and the mechanism bracket, and the second boosting elastic member 9 exerts an elastic force on the jump fastener 6 towards the opening position of disengagement. This realizes accelerating the action of opening by disengagement, making the opening by disengagement faster and more effective.

[0039] Specifically, the second boosting elastic member 9 is a tension spring, one end of which is hooked on one of the connecting columns 102, and the other end is hooked on the jump fastener 6.

[0040] The above-disclosed are only the preferred embodiments of the present utility model. Of course, the scope of the rights of the present utility model cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present utility model still fall within the scope covered by the present utility model.

Claims

1. A free tripping structure for a rotary isolating switch, the rotary isolating switch comprising a switch assembly consisting of a knob and a plurality of switch units, the free tripping structure being connected between the knob and the switch assembly; The free tripping structure comprises a mechanism support and a multi-link mechanism with an energy storage component, wherein the multi-link mechanism with an energy storage component comprises an output link (4), wherein the output link (4) is hingedly matched with the mechanism support via a first hinge axis with point D as the axis, wherein the output link (4) is provided with an output portion for transmission matching with the switch assembly, wherein the output link (4) rotates around point D to have an opening position and a closing position, and is characterized in that: A first assisting elastic member (5) is connected between the output connecting rod (4) and the mechanism bracket.

2. The free tripping structure for a rotary disconnector according to claim 1, characterized in that: The first assisting elastic member (5) is a torsion spring, comprising a fixing ring (501) and a free end (502) and a limiting end (503) extending from the fixing ring (501); the fixing ring (501) is sleeved on the first hinge shaft, and the free end (502) and the limiting end (503) are respectively abutted against the output connecting rod (4) and the mechanism bracket.

3. The free tripping structure for a rotary disconnector according to claim 2, characterized in that: The output connecting rod (4) is formed by bending an integral plate, and comprises two parallel hinge plates (401) and an action plate (402) connected between the two hinge plates (401); the hinge plate (401) is provided with a first hinge hole (403) for the first hinge shaft to pass through; the first assisting elastic member (5) is arranged between the two hinge plates (401) and the free end (502) abuts against the action plate (402); The mechanism bracket comprises two mechanism side plates (101) arranged relatively parallel to each other. The two mechanism side plates (101) are connected and fixed via a plurality of connecting columns (102), and the limiting end (503) abuts against one of the connecting columns (102).

4. The free tripping structure for a rotary disconnector according to any one of claims 1 to 3, characterized in that: The first assisting elastic member (5) exerts an elastic force on the output connecting rod (4) tending towards the opening position.

5. The free tripping structure for a rotary disconnector according to claim 4, characterized in that: The mechanism bracket is provided with a limit block (103) matching with the output connecting rod (4) at the opening position corresponding to the output connecting rod (4).

6. The free tripping structure for a rotary disconnector according to any one of claims 1 to 3, characterized in that: The first hinge shaft is circumferentially linked with the output connecting rod (4), and one end or both ends of the first hinge shaft extend out of the mechanism bracket to form an output part.

7. The free tripping structure for a rotary disconnector according to claim 1, characterized in that: The multi-link mechanism with energy storage element comprises an upper link (2), a lower link (3), an input arm (10), a jumper (6), and an energy storage spring (8); the jumper (6) and the mechanism bracket are hingedly matched through a second hinge axis with point O as the axis; the jumper (6) and the upper link (2) are hingedly matched through a third rotation axis with point A as the axis; the upper link (2) and the lower link (3) are hingedly matched through a fourth rotation axis with point B as the axis; and the lower link (3) and the output link (4) are hingedly matched through a fifth rotation axis with point C as the axis. The invention also comprises a locking member (7), wherein the jumper (6) cooperates with the locking member (7) to enable the jumper (6) to be in a locked state and a released state. When the two are in the locked state, the jumper (6) cannot rotate relative to the O point and is in an energy storage position in which the energy storage spring (8) stores energy. When the two are in the released state, the jumper (6) can rotate relative to the O point and the energy storage spring (8) can release energy. The jumper (6) rotates relative to the O point to a released and disconnected position in which the energy storage spring (8) is completely released and the switch assembly is in an open state.

8. The free tripping structure for a rotary disconnector according to claim 7, characterized in that: A second boosting elastic member (9) is provided between the tripping member (6) and the mechanism bracket, and the second boosting elastic member (9) generates an elastic force on the tripping member (6) tending towards a tripping and opening position.

9. The free tripping structure for a rotary disconnector according to claim 8, characterized in that: The second assisting elastic member (9) is a tension spring.

10. The free tripping structure for a rotary disconnector according to claim 7, characterized in that: The energy storage spring (8) is a tension spring, and its two ends are respectively connected to a connecting shaft fixed to the input arm (10) and a fourth rotating shaft with point B as the axis.

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