Triple box and double-fracture column type direct current switch

Abstract

The invention relates to the technical field of mechanical devices for preventing or buffering vibration or impact in electric switches, in particular to a triple box and a double-fracture column type direct current switch. The triple box comprises a box body, a rotating shaft is assembled in the box body in a rotating mode, a crank arm is installed on the rotating shaft, a rotation stopping key installation groove is formed in the peripheral face of the rotating shaft, a matched rotation stopping key is installed in the rotation stopping key installation groove, and the crank arm is matched with the rotating shaft through a shaft hole formed in the crank arm. A key groove corresponding to the rotation stopping key is formed in the hole wall of the shaft hole, the key groove at least extends to one side of the crank arm in the circumferential direction of the shaft hole, and the crank arm and the rotating shaft are in rotation stopping fit through the rotation stopping key. According to the triple box, rotation stopping between the rotating shaft and the crank arm can be achieved, relative rotation of the rotating shaft and the crank arm is avoided, meanwhile, large damage to the overall structure of the crank arm is avoided, the mechanical strength of the crank arm is guaranteed, and the service life of the crank arm is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical devices for preventing or buffering vibration or impact in electric switches, and in particular to a triple box and a double-break column type DC switch. Background Art

[0002] With the continuous improvement of DC engineering voltage level and transmission capacity, high-voltage DC switches have gradually developed from traditional single-break structures to multi-break structures. Currently, double-break columnar high-voltage DC switches are more commonly used. During the switch disconnection process, the separation of the moving and static contacts will generate an arc, which enters the arc extinguishing chamber through the guidance of the arc striking angle. The double-break design can ensure that the arc between the two breaks can enter the arc extinguishing chamber at the same time, thereby improving the consistency and stability of arc extinguishing. In addition, the columnar structure makes the switch structure more compact and smaller in size, which is convenient for the installation and maintenance of the switch.

[0003] The high-voltage DC switch with a double-break column structure mainly includes an operating mechanism, an insulating rod, a triple box and an arc extinguishing chamber. When working, the operating mechanism drives the insulating rod, and the insulating rod is connected to the transmission mechanism in the triple box. The transmission mechanism drives the moving end of the arc extinguishing chamber to move to complete the opening and closing operations. The transmission mechanism is a key component in the high-voltage DC switch, mainly including a rotating shaft and a crank arm. During the opening and closing operation, relative movement is likely to occur between the rotating shaft and the crank arm, affecting the consistency and synchronization of the two breaks, resulting in differences in the opening and closing speed and accuracy. Moreover, when the rotating shaft is connected to the mechanical property test device to test the mechanical properties of the switch, the relative rotation between the rotating shaft and the crank arm will cause deviations in the measurement results. In response to this problem, a Chinese invention patent application with application publication number CN111180225A and application publication date 2020.05.19 discloses a crank arm transmission structure and a crank arm box assembly for a switch device, wherein the crank arm is provided with a hexagonal stop hole for plugging and cooperating with the rotating shaft, and the crank arm is provided with an open gap along its length, and the open gap divides one end of the crank arm into two overhanging ends, and the open gap passes through the stop hole and divides the stop hole into two halves, and a locking through hole is provided in the direction of the crank arm perpendicular to the open gap, and a threaded fastener is inserted into the locking through hole to tighten the two overhanging ends and the stop hole, so that the drive shaft is fixed in the stop hole, thereby realizing the positioning of the drive shaft and the crank arm.

[0004] Although the above scheme realizes the positioning between the transmission shaft and the crank arm, a relatively long opening gap is opened on the crank arm, thereby forming two cantilevered ends, which causes great damage to the overall structure of the crank arm, resulting in reduced mechanical strength of the crank arm, making it prone to damage or breakage, reducing the service life of the crank arm, and further resulting in poor reliability of the DC switch. Summary of the invention

[0005] The purpose of the present invention is to provide a triple box, aiming to solve the problem that the mechanical strength of the crank arm that cooperates with the rotating shaft is reduced, it is easy to be damaged or broken, and the processing difficulty of the crank arm is increased, which is not conducive to use. At the same time, the purpose of the present invention is also to provide a double-break column type DC switch, in which the above triple box is applied to solve the problem of poor reliability of the DC switch.

[0006] In order to achieve the above purpose, the triple box of the present invention adopts the following technical solutions:

[0007] A triple box comprises a box body, in which a rotating shaft is rotatably assembled, a crank arm is installed on the rotating shaft, a stop key installation groove is provided on the outer circumferential surface of the rotating shaft, an adaptive stop key is installed in the stop key installation groove, the crank arm cooperates with the rotating shaft through an axial hole provided thereon, a key groove corresponding to the stop key is provided on the hole wall of the axial hole, the key groove extends along the circumference of the axial hole to at least one side of the crank arm, and the crank arm and the rotating shaft are stopped by the stop key.

[0008] Furthermore, at least one end of the rotating shaft extends outside the box body for connecting to a mechanical property testing device.

[0009] Furthermore, the anti-rotation key comprises an assembly part and a clamping part, the assembly part is fixedly assembled with the anti-rotation key installation groove, and the clamping part is clamped with the key groove.

[0010] Furthermore, the crank arm is triangular in shape, the axial hole is located at a corresponding corner of the crank arm, and the other two corners of the crank arm are respectively used to connect the support link plate and the moving end link plate.

[0011] Furthermore, the rotating shaft and the crank arm constitute a transmission mechanism, and the transmission mechanism is provided with two groups, and the two groups of transmission mechanisms are used to drive the movable end link plates connected to them to move.

[0012] Beneficial effects: The triple box of the present invention is an improved invention. By setting a stop key installation groove on the rotating shaft, setting an axial hole on the crank arm, and setting a keyway on the hole wall of the axial hole, when the rotating shaft is inserted into the axial hole on the crank arm, the stop key installation groove and the keyway correspond to each other, and by installing a stop key between the stop key installation groove and the keyway, the rotation between the rotating shaft and the crank arm is stopped. At this time, when the rotating shaft rotates in the box body, it will drive the crank arm to rotate synchronously, avoiding relative rotation between the rotating shaft and the crank arm, and at the same time avoiding major damage to the overall structure of the crank arm, ensuring the mechanical strength of the crank arm, and improving the service life of the crank arm.

[0013] The double-break column type DC switch of the present invention adopts the following technical solutions:

[0014] A double-break column-type DC switch comprises an insulating pull rod, a triple box and a moving end of an arc extinguishing chamber. The triple box comprises a box body, and also comprises a support connecting plate and a moving end connecting plate. A rotating shaft is rotatably assembled in the box body, and a crank arm is installed on the rotating shaft. The crank arm is connected to the support connecting plate and the moving end connecting plate at the same time. A stop key mounting groove is arranged on the outer circumferential surface of the rotating shaft, and a matching stop key is installed in the stop key mounting groove. The crank arm cooperates with the rotating shaft through an axial hole arranged thereon, and a key groove corresponding to the stop key is arranged on the hole wall of the axial hole, and the key groove extends along the circumference of the axial hole to at least one side of the crank arm, and the crank arm and the rotating shaft are stopped by the stop key.

[0015] Furthermore, at least one end of the rotating shaft extends outside the box body for connecting to a mechanical property testing device.

[0016] Furthermore, the anti-rotation key comprises an assembly part and a clamping part, the assembly part is fixedly assembled with the anti-rotation key installation groove, and the clamping part is clamped with the key groove.

[0017] Furthermore, the crank arm is triangular in shape, the anti-rotation hole is located at a corresponding corner of the crank arm, and the other two corners of the crank arm are respectively used to connect the support link plate and the moving end link plate.

[0018] Furthermore, the rotating shaft and the crank arm constitute a transmission mechanism, and the transmission mechanism is provided with two groups, and the two groups of transmission mechanisms are used to drive the movable end link plates connected to them to move.

[0019] Beneficial effects: The double-break column type DC switch of the present invention is an improved invention. By setting a stop key installation groove on the rotating shaft, setting an axial hole on the crank arm, and setting a keyway on the hole wall of the axial hole, when the rotating shaft is inserted into the axial hole on the crank arm, the stop key installation groove and the keyway correspond to each other, and by installing a stop key between the stop key installation groove and the keyway, the rotation between the rotating shaft and the crank arm is stopped. At this time, when the rotating shaft rotates in the box, it will drive the crank arm to rotate synchronously, avoiding relative rotation between the rotating shaft and the crank arm, and at the same time avoiding major damage to the overall structure of the crank arm, ensuring the mechanical strength of the crank arm, and improving the service life of the crank arm, thereby improving the reliability of the DC switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a double-break column type DC switch of the present invention in a working state;

[0021] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the CC;

[0022] Figure 3 It is a schematic diagram of the position of the anti-rotation key installation groove on the rotating shaft in one embodiment of the triple box of the present invention;

[0023] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the middle BB;

[0024] Figure 5 It is a schematic diagram of the position of the keyway on the crank arm in one embodiment of the triple box of the present invention;

[0025] Figure 6 It is a schematic structural diagram of a stop key in an embodiment of a triple box of the present invention.

[0026] In the figure: 1. Box body; 2. Rotating shaft; 3. Crank arm; 4. Stop key mounting groove; 5. Stop key; 6. Shaft hole; 7. Keyway; 8. Support connecting plate; 9. Moving end connecting plate; 10. Insulating pull rod; 11. Moving end of arc extinguishing chamber. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] The embodiment of the triple box of the present invention:

[0029] In a high-voltage DC switch with a double-break column structure, a triple box is usually connected to the moving ends of the left and right arc extinguishing chambers. A transmission mechanism corresponding to the arc extinguishing chamber is also provided inside the triple box. The transmission mechanism is used to drive the moving contact of the arc extinguishing chamber to perform opening and closing operations. The transmission mechanism mainly includes a rotating shaft and a crank arm. Relative rotation is easy to occur between the rotating shaft and the crank arm, which affects the consistency and synchronization of the two breaks, resulting in differences in the opening and closing speed and accuracy of the moving ends of the left and right arc extinguishing chambers. In order to avoid the above problems, a block that can stop the rotating shaft and the crank arm is provided between the rotating shaft and the crank arm, so as to achieve relative positioning of the rotating shaft and the crank arm and avoid relative rotation of the rotating shaft and the crank arm. Based on the above inventive concept, the present invention proposes a triple box that can stop the rotating shaft and the crank arm, and has less damage to the overall structure of the crank arm, thereby ensuring the mechanical strength of the crank arm.

[0030] See also Figures 1 to 6As a basic embodiment of the present invention, a triple box includes a box body 1, a rotating shaft 2 is rotatably assembled in the box body 1, a crank arm 3 is installed on the rotating shaft 2, a stop key installation groove 4 is provided on the outer circumferential surface of the rotating shaft 2, and an adapted stop key 5 is installed in the stop key installation groove 4, the crank arm 3 cooperates with the rotating shaft 2 through an axial hole 6 provided thereon, a key groove 7 corresponding to the stop key 5 is provided on the hole wall of the axial hole 6, the key groove 7 extends at least to one side of the crank arm 3 along the circumferential direction of the axial hole 6, and the crank arm 3 and the rotating shaft 2 are stopped by the stop key 5, where the depth of the stop key installation groove 4 is less than the radius of the rotating shaft 2, and the thickness of the stop key 5 is greater than The depth of the stop key mounting groove 4 is set so that a part of the stop key 5 can extend out of the stop key mounting groove 4, which is convenient for engaging with the key groove 7. When the rotating shaft 2 passes through the shaft hole 6, the stop key mounting groove 4 on the rotating shaft 2 and the key groove 7 on the crank arm 3 are arranged relative to each other. At this time, the stop key 5 is between the key groove 7 and the stop key mounting groove 4. The stop key 5 realizes the stopping of the rotating shaft 2 and the crank arm 3 and avoids rotation between the rotating shaft 2 and the crank arm 3. At the same time, the design of the key groove 7 will not cause too much damage to the overall structure of the crank arm 3, and can ensure the mechanical strength of the crank arm 3. The crank arm 3 will not break easily, which can increase the service life of the crank arm 3.

[0031] As a preferred embodiment of the present invention, at least one end of the rotating shaft 2 extends outside the box body 1 for connecting a mechanical property testing device. At this time, the rotating shaft 2 and the crank arm 3 are matched through a stop key 5, which effectively avoids relative rotation between the rotating shaft 2 and the crank arm 3, thereby improving the accuracy of the mechanical property test. Accurate mechanical properties can provide important support for evaluating the reliability and stability of the operation of the high-voltage DC switch.

[0032] As a preferred embodiment of the present invention, the stop key 5 includes an assembly part and a clamping part, the assembly part is fixedly assembled with the stop key installation groove 4, and the clamping part is clamped with the key groove 7, that is, a part of the stop key 5 is fixedly assembled in the stop key installation groove 4 on the rotating shaft 2, and the other part is clamped in the key groove 7 on the crank arm 3. Such an arrangement can prevent the stop key 5 from loosening and falling. In other embodiments, the stop key 5 can also be welded and fixed to the stop key installation groove 4, or fixed with bolt fasteners, as long as it does not affect the clamping connection between the stop key 5 and the key groove 7, so that the stop key 5 always maintains a firm connection with the stop key installation groove 4.

[0033] As a preferred embodiment of the present invention, the crank arm 3 is triangular, and the shaft hole 6 is located at a corresponding corner of the crank arm 3. The other two corners of the crank arm 3 are used to connect the pillar connecting plate 8 and the moving end connecting plate 9 respectively. When working, the pillar connecting plate 8 will drive the crank arm 3 to flip. Due to the setting of the stop key 5 between the crank arm 3 and the rotating shaft 2, the crank arm 3 will drive the rotating shaft 2 to flip synchronously, and then drive the moving end connecting plate 9 to move to complete the opening and closing operation. When the three corners of the crank arm 3 rotate, the required force arm is the shortest and most uniform. Therefore, setting the shaft hole at the angle of the crank arm 3 can facilitate the crank arm 3 to drive the rotating shaft 2 to flip synchronously. In other embodiments, the crank arm 3 can also be set to a polygon, or composed of two hinged connecting rods, as long as the transmission effect can be achieved and no relative rotation occurs with the rotating shaft 2.

[0034] As a preferred embodiment of the present invention, the rotating shaft 2 and the crank arm 3 constitute a transmission mechanism, and the transmission mechanism is provided with two groups, and the two groups of transmission mechanisms are used to drive the moving end connecting plate 9 connected to each other to move. In the high-voltage DC switch with double-break column structure, the design of the double break requires the double transmission mechanism to transmit each, and it is only necessary to keep the rotation angle and rotation speed of the crank arm 3 in the double transmission mechanism consistent with the rotating shaft 2, so that the opening and closing speeds of the two breaks are consistent, and normal current opening and closing can be achieved. In other embodiments, the transmission mechanism can also be set to three or more groups, which can be determined according to the specific use requirements.

[0035] The use process of the triplex box of the present invention is as follows: the operating mechanism in the high-voltage DC switch drives the insulating pull rod 10 to move, the insulating pull rod 10 drives the supporting connecting plate 8 to flip, the supporting connecting plate 8 drives the crank arm 3 to flip synchronously with the rotating shaft 2, the crank arm 3 drives the moving end connecting plate 9 to flip, and the moving end connecting plate 9 drives the moving end 11 of the arc extinguishing chamber to flip, forming the opening and closing of the fracture, thereby realizing the opening and closing operation. In this process, the stop key 5 realizes the stop between the rotating shaft 2 and the crank arm 3, avoiding relative rotation between the rotating shaft 2 and the crank arm 3, and at the same time avoiding major damage to the overall structure of the crank arm 3, thereby ensuring the mechanical strength of the crank arm 3.

[0036] Implementation method of the double-break column type DC switch of the present invention:

[0037] The double-break column-type DC switch includes an insulating pull rod 10, a triple box and a moving end 11 of the arc extinguishing chamber. The triple box is the above-mentioned triple box, and the triple box also includes a support connecting plate 8 and a moving end connecting plate 9. The crank arm 3 is connected to the support connecting plate 8 and the moving end connecting plate 9 at the same time. The moving end connecting plate 9 and the support connecting plate 8 are respectively connected to the moving end 11 of the arc extinguishing chamber and the insulating pull rod 10. The specific structure of the triple box will not be repeated here.

[0038] The use process of the double-break column-type DC switch of the present invention is as follows: the operating mechanism in the double-break column-type high-voltage DC switch drives the insulating pull rod 10 to move, the insulating pull rod 10 drives the support connecting plate 8 to flip, the support connecting plate 8 drives the crank arm 3 to flip synchronously with the rotating shaft 2, the crank arm 3 drives the moving end connecting plate 9 to flip, the moving end connecting plate 9 drives the moving end 11 of the arc extinguishing chamber to flip, forming the opening and closing of the break, thereby realizing the opening and closing operation. In this process, the stop key 5 realizes the stop between the rotating shaft 2 and the crank arm 3, ensures the mechanical strength of the crank arm 3, and improves the reliability of the DC switch.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A triple box, comprising a box body, a rotating shaft rotatably mounted in the box body, a crank arm mounted on the rotating shaft, characterized in that: A stop key installation groove is provided on the outer circumferential surface of the rotating shaft, and a matching stop key is installed in the stop key installation groove. The crank arm cooperates with the rotating shaft through the axial hole provided thereon, and a key groove corresponding to the stop key is provided on the hole wall of the axial hole. The key groove extends along the circumference of the axial hole to at least one side of the crank arm, and the crank arm and the rotating shaft are stop-rotated by the stop key.

2. The triple box according to claim 1, characterized in that: At least one end of the rotating shaft extends outside the box body to be connected to a mechanical property testing device.

3. The triple box according to claim 1, characterized in that: The anti-rotation key comprises an assembly part and a clamping part. The assembly part is fixedly assembled with the anti-rotation key installation groove, and the clamping part is clamped with the key groove.

4. The triple box according to claim 1, characterized in that: The crank arm is triangular in shape, the shaft hole is located at a corresponding corner of the crank arm, and the other two corners of the crank arm are respectively used to connect the support link plate and the moving end link plate.

5. The triple box according to claim 1 or 4, characterized in that: The rotating shaft and the crank arm form a transmission mechanism, and the transmission mechanism is provided with two groups, and the two groups of transmission mechanisms are used to drive the movable end link plates connected to them to move.

6. A double-break column type DC switch, comprising an insulating pull rod, a triple box and a moving end of an arc extinguishing chamber, wherein the triple box comprises a box body, a support link plate and a moving end link plate, a rotating shaft is rotatably mounted in the box body, a crank arm is mounted on the rotating shaft, and the crank arm is connected to the support link plate and the moving end link plate at the same time, characterized in that: A stop key installation groove is provided on the outer circumferential surface of the rotating shaft, and a matching stop key is installed in the stop key installation groove. The crank arm cooperates with the rotating shaft through the axial hole provided thereon, and a key groove corresponding to the stop key is provided on the hole wall of the axial hole. The key groove extends along the circumference of the axial hole to at least one side of the crank arm, and the crank arm and the rotating shaft are stop-rotated by the stop key.

7. The double-break column type DC switch according to claim 6, characterized in that: At least one end of the rotating shaft extends outside the box body to be connected to a mechanical property testing device.

8. The double-break column type DC switch according to claim 6, characterized in that: The anti-rotation key comprises an assembly part and a clamping part. The assembly part is fixedly assembled with the anti-rotation key installation groove, and the clamping part is clamped with the key groove.

9. The double-break column type DC switch according to claim 6, characterized in that: The crank arm is triangular in shape, the anti-rotation hole is located at a corresponding corner of the crank arm, and the other two corners of the crank arm are respectively used to connect the support link plate and the moving end link plate.

10. The double-break column type DC switch according to claim 6 or 9, characterized in that: The rotating shaft and the crank arm form a transmission mechanism, and the transmission mechanism is provided with two groups, and the two groups of transmission mechanisms are used to drive the movable end link plates connected to them to move.

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