Permanent magnetic mechanism and emergency manual opening camshaft thereof

Abstract

The utility model aims to provide a permanent magnetic mechanism and an emergency manual opening camshaft thereof. The cam shaft comprises an eccentric shaft, and the eccentric shaft is divided into a butt joint section shaft, a supporting section shaft and an eccentric section shaft in the axial direction. The eccentric section shaft is sleeved with a roller, a limiting structure is arranged between the roller and the eccentric shaft, and the limiting structure enables the roller to rotate in the circumferential direction relative to the eccentric shaft without axial movement. The permanent magnetic mechanism with the camshaft has the advantages of quicker operation, lighter weight, high reliability and long service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to the manual opening device of vacuum switch for power supply and distribution of power system, especially relates to a permanent magnet mechanism and its emergency manual opening camshaft. BACKGROUND

[0002] The permanent magnet mechanism arouses the universal attention of the industry and obtains the rapid development because of its few parts, especially only one moving assembly, and the advantages of high reliability, long life and easy control.

[0003] At present, the permanent magnet mechanism is divided into single stable state and double stable state structure according to the holding of closing and opening terminal position, and is divided into single beat and double beat mode according to the holding form of closing terminal position, and is divided into push and pull mode according to the force of excitation coil on moving iron core when electrically opening.

[0004] In order to ensure the safety and high reliability of power system operation, no matter which structure form and working mode, the permanent magnet mechanism must have the emergency manual opening function, that is, even if the operation power supply fails or the secondary opening circuit fails or cannot be electrically opened due to any reason, manual opening can also be reliably carried out. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a permanent magnet mechanism and its emergency manual opening camshaft, the permanent magnet mechanism with the camshaft has the advantages of more agile operation, more light, high reliability and long life.

[0006] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0007] An emergency manual opening camshaft of a permanent magnet mechanism, which has the structural characteristics that it comprises an eccentric shaft, the eccentric shaft is divided into a butt joint section shaft, a support section shaft and an eccentric section shaft along the axial direction;

[0008] A roller is sleeved on the eccentric section shaft, and a limiting structure is arranged between the roller and the eccentric shaft, so that the roller rotates in the circumferential direction relative to the eccentric shaft without axial movement.

[0009] When working, the pre-rotation force of clockwise rotation is applied to the camshaft, so that the roller on the camshaft is tangent to the upper end surface of the permanent magnet mechanism and remains in this position, the permanent magnet mechanism is in the closing terminal position and in the opening standby state.

[0010] When emergency manual opening is needed, the external manual opening handle is connected with the shaft of the butt joint section of the eccentric shaft, the opening handle is counterclockwise rotated, the eccentric shaft is counterclockwise rotated, the roller installed on the eccentric shaft is counterclockwise rotated along the shaft center line of the supporting section, the contact with the permanent magnet mechanism is separated and is lifted upward, with the continuous rotation of the manual opening handle, the roller is tangent to the lower circular surface of the opening disc, then the roller is rotated around the eccentric section shaft center line of the eccentric shaft while the roller is counterclockwise rotated along the shaft center line of the supporting section of the eccentric shaft, the dynamic iron core assembly is moved upward by a small distance, at this time, the holding force of the permanent magnet mechanism is suddenly reduced, the circuit breaker is quickly opened under the action of the external spring force, when the "click" sound is heard, it indicates that the manual opening operation of the circuit breaker is completed.

[0011] According to the embodiments of the utility model, the utility model can be further optimized, and the following is the technical scheme formed after optimization:

[0012] In one preferred embodiment, the eccentric section shaft is a stepped shaft, and the limiting structure is a check ring; the outer wall of the stepped shaft and the inner wall of the roller are both provided with a mounting groove for accommodating the check ring. The check ring can limit the roller from separating from the eccentric shaft during movement.

[0013] In one preferred embodiment, the supporting section shaft is an optical shaft, a first shaft seat is clearance-fitted on the supporting section shaft, and a first grease storage groove is formed in the inner hole wall of the first shaft seat. Further, a pin is interference-fitted on the supporting section shaft, the pin is located on the side of the first shaft seat close to the butt joint section shaft, and a torsional spring is connected between the pin and the first shaft seat, one end of the torsional spring is fixed to the first shaft seat, and the other end is fixed to the pin. When the manual opening handle is continuously rotated, the torsional spring is simultaneously twisted and stored with the eccentric shaft through the pin, and the cam shaft is reset counterclockwise under the torsional force of the torsional spring when the manual opening handle is pulled out.

[0014] In one preferred embodiment, the supporting section shaft is an optical shaft, a first shaft seat and a second shaft seat are clearance-fitted on the supporting section shaft, a first grease storage groove is formed in the inner hole wall of the first shaft seat, and a second grease storage groove is formed in the inner hole wall of the second shaft seat. Further, a pin is interference-fitted on the supporting section shaft, the pin is located between the first shaft seat and the second shaft seat, and a torsional spring is connected between the pin and the first shaft seat, one end of the torsional spring is fixed to the first shaft seat, and the other end is fixed to the pin. When the manual opening handle is continuously rotated, the torsional spring is simultaneously twisted and stored with the eccentric shaft through the pin, and the cam shaft is reset counterclockwise under the torsional force of the torsional spring when the manual opening handle is pulled out.

[0015] In one of the preferred embodiments, a third grease groove is further provided on the inner wall of the roller.

[0016] In one preferred embodiment, the outer diameter of the roller is equal to or greater than the maximum diameter of the eccentric shaft.

[0017] Based on the same inventive concept, the utility model also provides a permanent magnet mechanism, which includes an upper end cover and a moving iron core assembly, the core shaft of the moving iron core assembly protrudes relative to the upper end cover, and a trip disk is fixed at the protruding end of the core shaft; a cam shaft for emergency manual tripping of the permanent magnet mechanism is provided on one side of the trip disk; the cam shaft is fixed to the upper end cover through a shaft seat installed on the supporting section shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model connects an external manual trip handle to the eccentric shaft and rotates it, driving the eccentric shaft to rotate with the first shaft seat and the second shaft seat as fulcrums. The eccentric shaft drives the roller mounted on its eccentric section shaft to rotate. As the eccentric shaft rotates, the roller is gradually lifted. When it contacts the trip disk, the eccentric shaft continues to rotate. On the one hand, the roller rotates with the axis of the eccentric section shaft of the eccentric shaft, and on the other hand, its outer circle acts on the lower annular surface of the trip disk and rolls on it, so that the trip disk drives the moving iron core assembly of the permanent magnet mechanism to move upward, so that the suction surface inside the permanent magnet mechanism is pulled apart a certain small distance. At this time, the holding force of the permanent magnet mechanism drops sharply, and the gate is quickly opened under the action of the external spring reaction force.

[0020] The camshaft of the utility model can make the emergency manual opening operation more agile, more portable, more reliable, and has the advantage of long service life, which matches the ultra-long service life of the permanent magnet mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural principle diagram of an embodiment of the utility model (the camshaft 9 is installed on the permanent magnet mechanism 1 in the closed state);

[0022] Figure 2 for Figure 1 Side view of the middle camshaft 9.

[0023] Figure 3 This is a front view (axial direction) of the camshaft 9 when the manual brake is opened by rotating counterclockwise.

[0024] Figure 4 This is a front view (axial direction) of the camshaft 9 when manually opening the brake when rotating clockwise. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.

[0026] comparison Figure 1 Reference Figure 2 It can be seen that the emergency manual tripping device of this embodiment is composed of a permanent magnet mechanism 1, a moving iron core assembly 2 installed in the permanent magnet mechanism 1, a tripping disc 3, a screw 4, a first shaft seat 5, a torsion spring 6, a pin 7, a second shaft seat 8, and a camshaft 9. Among them, the camshaft 9 is a core component, which is composed of an eccentric shaft 10, a roller 11 and a wire retaining ring 12. The wire retaining ring 12 limits the roller 11 from separating from the eccentric shaft 10 during movement. The inner hole of the first shaft seat 5 is provided with a first grease storage groove 5-1, and the inner hole of the second shaft seat 8 is provided with a second grease storage groove 8-1 for storing grease, so that long-term lubrication can be provided for the two sets of rotating sliding friction surfaces composed of the eccentric shaft 10 and the first shaft seat 5 and the second shaft seat 8.

[0027] For the camshaft 9 of the core component: the roller 11 is installed on the eccentric section shaft 10-3 of the eccentric shaft 10, and the two are fitted with a wire retaining ring 12 to limit the axial movement, so that the roller 11 can only rotate around the axis of the eccentric section shaft 10-3, so that it can only rotate relative to the eccentric section shaft 10-3 and will not fall out. The roller 11 is provided with a third grease storage groove 11-1 for storing grease to provide long-term lubrication for the rotating sliding friction surface composed of the roller 11 and the eccentric shaft 10.

[0028] The eccentric shaft section 10-3 is a stepped shaft. The outer diameter of the roller 11 is equal to or greater than the maximum diameter of the eccentric shaft section 10-3.

[0029] The connecting section 10-1 of the eccentric shaft 10 is milled flat, or adopts an external three-square, external four-square or above shape, which is used to transmit the hand force after the external manual opening handle is connected.

[0030] The supporting section shaft 10-2 of the eccentric shaft 10 adopts a smooth axis, which is loosely matched with the shaft seat 5 and the shaft seat 8. The shaft seat 5 and the shaft seat 8 are respectively provided with a first grease storage groove 5-1 and a second grease storage groove 8-1 in the inner hole for storing grease to provide long-term lubrication for the rotating sliding friction surface here. A shaft seat can also be configured.

[0031] On the left side of the shaft seat 5, the torsion spring 6 is sleeved on the supporting section shaft 10-2 of the eccentric shaft 10, one end of which is fixed on the shaft seat 5, and the other end is ring-shaped and inserted into the pin 7. The pin 7 has an interference fit with the radial hole of the eccentric shaft 10. The pin 7 can be a cylindrical pin or an elastic cylindrical pin.

[0032] comparison Figure 2It can be seen that the assembly process of the camshaft 9 assembly: first, the inner hole of the roller 11 and the third grease storage groove 11-1 are coated with lubricating grease, the steel wire retainer 12 is sleeved on the eccentric shaft 10 of the eccentric shaft 10-3 and falls into the groove, then the special tool is used to clamp the steel wire retainer 12, and the steel wire retainer 12 is shrunk into the groove, the roller 11 is sleeved on the eccentric shaft 10-3, and the special tool is pushed together and moved inward, when the steel wire retainer 12 falls into the inner hole of the roller 11, the special tool is removed and continues to move inward, until the steel wire retainer 12 expands and falls into the corresponding groove of the roller 11, at this time the assembly is completed, the roller 11 should be able to rotate flexibly, and there is a small movement in the axial direction and will not be pulled out.

[0033] By contrast Figure 1 By reference Figure 3 It can be seen that the assembly process of the emergency manual opening device: first, the opening disc 3 is fixed on the moving iron core assembly 2 using screws 4; then the inner holes of the first shaft seat 5 and the second shaft seat 8 and the first grease storage groove 5-1 and the second grease storage groove 8-1 are coated with lubricating grease, the first shaft seat 5 is sleeved on the eccentric shaft 10 support shaft 10-2 and reaches the root thereof; then the torsional spring 6 is sleeved on the eccentric shaft 10 support shaft 10-2, one end of which is fixed on the first shaft seat 5, and the other end is aligned with the radial hole of the support shaft 10-2, the pin 7 is inserted through the circle of the torsional spring 6 into the radial hole of the support shaft 10-2 to a suitable position; then the second shaft seat 8 is sleeved on the eccentric shaft 10 support shaft 10-2 at a suitable position; then the whole is placed on the upper end surface of the permanent magnet mechanism 1, the camshaft 9 is rotated to the angle shown in the figure and the torsional spring 6 is twisted by a certain angle, the first shaft seat 5 and the second shaft seat 8 are aligned with the corresponding holes of the permanent magnet mechanism 1, and are connected as a whole using screws; finally, the camshaft 9 assembly is rotated, which should be flexible and reliable in reset. Figure 3 By contrast By reference

[0034] By contrast Figure 3 By reference Figure 4 It can be seen that through the installation direction adjustment of the camshaft 9 assembly and the selection of right-handed or left-handed torsional spring 6, the manual opening operation can be counterclockwise or clockwise.

[0035] The embodiment also provides a permanent magnet mechanism, which comprises an upper end cover and a moving iron core assembly 2, a core shaft of the moving iron core assembly 2 extends out of the upper end cover 13, and an opening disc 3 is fixed at the extending end of the core shaft; one side of the opening disc 3 is provided with the camshaft 9 of the emergency manual opening device of the permanent magnet mechanism; and the camshaft 9 is fixed on the upper end cover 13 through the shaft seat installed on the support shaft 10-2.

[0036] The working principle of the embodiment is as follows: the torsion spring 6 applies a clockwise pre-rotation force to the camshaft 9 assembly, so that the roller 11 on the camshaft 9 assembly is tangent to the upper end surface of the permanent magnet mechanism 1 and is kept in this position, and the permanent magnet mechanism 1 is in the closed terminal position and is in the waiting opening state. When emergency manual opening is needed, the external manual opening handle is connected with the connecting segment shaft 10-1 of the eccentric shaft 10, the opening handle is counterclockwise rotated, the eccentric shaft 10 is counterclockwise rotated with the first shaft seat 5 and the second shaft seat 8 as the fulcrum, the roller 11 mounted thereon is counterclockwise rotated with the axis of the supporting segment shaft 10-2 as the fulcrum, and is separated from the contact with the permanent magnet mechanism 1 and is lifted upward. With the continuous rotation of the manual opening handle, the roller 11 is tangent to the lower annular surface of the opening disc 3, and then the roller 11 is counterclockwise rotated with the axis of the supporting segment shaft 10-2 of the eccentric shaft 10 as the fulcrum and is rotated around the axis of the eccentric segment shaft 10-3 of the eccentric shaft 10, and rolls on the lower annular surface of the opening disc 3, so that the movable iron core assembly 2 moves upward by a small distance. At this time, the holding force of the permanent magnet mechanism is suddenly reduced, and the circuit breaker is quickly opened under the action of the external spring reaction force. When the sound of "click" is heard, it indicates that the manual opening operation of the circuit breaker is completed, and the torsion spring 6 is torsionally stored with the eccentric shaft 10 simultaneously driven by the pin 7. At this time, the manual opening handle is pulled out, the camshaft 9 is clockwise rotated and reset under the action of the torsion force of the torsion spring 6, until the roller 11 mounted on the eccentric shaft 10 is tangent to the upper end surface of the permanent magnet mechanism 1 and is kept in this position, so as to prepare for the next manual opening.

[0037] For the rotating and sliding friction surface of the eccentric shaft 10 and the first shaft seat 5 and the second shaft seat 8, the first grease storage groove 5-1 and the second grease storage groove 8-1 store sufficient lubricating grease, so as to provide long-acting lubrication; for the rotating and sliding friction surface of the roller 11 and the eccentric shaft 10, the third grease storage groove 11-1 stores sufficient lubricating grease, so as to provide long-acting lubrication; for the rolling friction surface of the roller 11 and the opening disc 3, the two are coated with lubricating grease on the mutual action surface.

[0038] The above-mentioned embodiment should be understood as the embodiment only for more clearly illustrating the utility model, and should not be used for limiting the scope of the utility model. After reading the utility model, the modification of various equivalent forms of the embodiment made by the person skilled in the art all fall within the scope defined by the claims of the utility model.

Claims

1. A camshaft for emergency manual opening of a permanent magnet mechanism, characterized in that: It comprises an eccentric shaft (10), wherein the eccentric shaft (10) is divided into a docking section shaft (10-1), a supporting section shaft (10-2) and an eccentric section shaft (10-3) along the axial direction; The eccentric shaft (10-3) is sleeved with a roller (11), and a limiting structure is provided between the roller (11) and the eccentric shaft (10). The limiting structure enables the roller (11) to rotate circumferentially relative to the eccentric shaft (10) without axial movement.

2. The camshaft for emergency manual opening of a permanent magnet mechanism according to claim 1, characterized in that: The eccentric section shaft (10-3) is a stepped shaft, and the limiting structure is a retaining ring (12); an outer wall of the stepped shaft and an inner wall of the roller (11) are both provided with mounting grooves for accommodating the retaining ring (12).

3. The camshaft for emergency manual opening of a permanent magnet mechanism according to claim 1, characterized in that: The supporting section shaft (10-2) is an optical axis, and a first shaft seat (5) is loosely fitted on the supporting section shaft (10-2); a first grease storage groove (5-1) is provided on the inner hole wall of the first shaft seat (5).

4. The camshaft for emergency manual opening of a permanent magnet mechanism according to claim 3, characterized in that: A pin (7) is interference-fitted on the supporting section shaft (10-2), and the pin (7) is located on the side of the first shaft seat (5) close to the docking section shaft (10-1). A torsion spring (6) is connected between the pin (7) and the first shaft seat (5), and one end of the torsion spring (6) is fixed to the first shaft seat (5), and the other end is fixed to the pin (7).

5. The camshaft for emergency manual opening of a permanent magnet mechanism according to claim 1, characterized in that: The supporting section shaft (10-2) is an optical axis, and a first shaft seat (5) and a second shaft seat (8) are loosely fitted on the supporting section shaft (10-2); a first grease storage groove (5-1) is provided on the inner hole wall of the first shaft seat (5), and a second grease storage groove (8-1) is provided on the inner hole wall of the second shaft seat (8).

6. The camshaft for emergency manual opening of a permanent magnet mechanism according to claim 5, characterized in that: A pin (7) is interference-fitted on the supporting section shaft (10-2), and the pin (7) is located between the first shaft seat (5) and the second shaft seat (8). A torsion spring (6) is connected between the pin (7) and the first shaft seat (5), and one end of the torsion spring (6) is fixed to the first shaft seat (5), and the other end is fixed to the pin (7).

7. The cam shaft for emergency manual opening of a permanent magnet mechanism according to any one of claims 1 to 6, characterized in that: A third grease groove (11-1) is also provided on the inner wall of the roller (11).

8. The cam shaft for emergency manual opening of a permanent magnet mechanism according to any one of claims 1 to 6, characterized in that: The outer diameter of the roller (11) is equal to or greater than the maximum diameter of the eccentric segment shaft (10-3).

9. A permanent magnet mechanism, comprising an upper end cover and a moving iron core assembly (2), wherein the core shaft of the moving iron core assembly (2) extends relative to the upper end cover (13), and a trip disc (3) is fixed to the extended end of the core shaft; characterized in that: A cam shaft (9) for emergency manual opening of a permanent magnetic mechanism according to any one of claims 1 to 8 is provided on one side of the opening disc (3); The camshaft (9) is fixed on the upper end cover (13) via a shaft seat mounted on the supporting section shaft (10-2).

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