Closing mechanism of isolating switch

Abstract

The utility model relates to the field of disconnecting switches, and discloses a closing mechanism of a disconnecting switch, which comprises a base, an insulating column I, an insulating column II, a movable contact seat, a hinge lug, a knife switch, a static contact seat, a static contact piece and a buffer mechanism, and is characterized in that the insulating column I and the insulating column II are fixedly mounted at the top of the base, and the movable contact seat is fixedly mounted at the top of the insulating column II; the hinge lug is fixedly installed on one side wall of the movable contact seat, one end of the knife switch is rotatably connected with the hinge lug, the static contact seat is fixedly installed on the top of the first insulation column, the static contact piece is fixedly installed on one side wall of the static contact seat, and a closing groove is formed in the end, away from the hinge lug, of the knife switch. The isolating switch has the following advantages and effects: the impact force generated at the closing moment can be effectively buffered and unloaded, so that the knife switch can be stably contacted with the static contact piece to complete the closing operation, the damage to equipment caused by the overlarge impact force at the closing moment is avoided, the service life of the isolating switch is prolonged, and the stable operation of the isolating switch is ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of disconnectors, in particular to a closing mechanism of a disconnector. BACKGROUND

[0002] The disconnector is a kind of switching device mainly used for isolating power supply, switching operation, connecting and cutting off small current circuit, and has no arc extinguishing function. When the disconnector is in the disconnecting position, the contact has an insulation distance meeting the requirements and an obvious disconnecting mark; when the disconnector is in the closing position, the disconnector can bear the current under normal circuit conditions and the current under abnormal conditions within a specified time. The disconnector is a large switching device, and generally, the closing or opening of the disconnector is realized by rotating a push arm to drive a contactor to rotate. When the contactor of the existing disconnector is opened or closed, the push arm needs to be rotated greatly to make the contactor of the disconnector open or close, so that a large force is required to rotate the push arm, resulting in waste of energy resources.

[0003] In view of the above problems, the closing and opening mechanism of the disconnector disclosed in the Chinese patent with the patent number CN212625346U has the technical points that the mechanism comprises a base, first and second insulation columns are arranged at two ends of the base respectively, a static contact seat is fixed on the first insulation column, a static contact piece is installed on the static contact seat, a dynamic contact seat is fixed on the second insulation column, a contactor is rotatably arranged on the dynamic contact seat, the contactor is matched with the static contact piece, a push arm for pushing the contactor to rotate is further arranged, and a rotating rod is rotatably arranged on the base; one end of the push arm is hinged to the rotating rod, the other end of the push arm is provided with a bent portion bent towards the side of the dynamic contact seat, the bent portion is hinged to the contactor, when the rotating rod is rotated, the rotating rod pushes the push arm upwards to rotate towards the side of the dynamic contact seat, the bent portion bent towards the dynamic contact seat pushes the contactor to the side of the dynamic contact seat, so that only a small amplitude of the rotating rod needs to be rotated, the bent portion can push the contactor to rotate around the dynamic contact seat by a large amplitude and make the contactor separate from the static contact seat, thereby saving resources.

[0004] The above scheme can close the disconnector by rotating the rotating rod by a small amplitude, save the operating force of the disconnector, and save resources, but in actual operation, at least the following defects are found: in the last stage of closing the disconnector, the speed of the contactor approaching the static contact piece is relatively fast, a large impact force is generated at the moment of closing the contactor and the static contact piece, the impact force generated at the moment of closing cannot be buffered and unloaded, the contact of the contactor and the static contact piece for completing the closing operation is not stable, and the large impact force at the moment of closing easily causes damage to the equipment, and the service life of the disconnector is reduced.

[0005] Therefore, the application provides a closing mechanism of a disconnector to solve the above problems. CONTENT OF THE UTILITY MODEL

[0006] The purpose of the present application is to provide a closing mechanism of an isolating switch, which can effectively buffer the impact force generated at the closing moment, avoid damage to the equipment caused by excessive impact force at the closing moment, prolong the service life of the isolating switch, and ensure stable operation.

[0007] The above technical purpose of the present application is achieved by the following technical scheme: a closing mechanism of an isolating switch, comprising a base, an insulating column one, an insulating column two, a moving contact seat, a hinged lug, a blade, a static contact seat, a static contact piece, and a buffer mechanism, the insulating column one and the insulating column two are both fixedly installed on the top of the base, the moving contact seat is fixedly installed on the top of the insulating column two, the hinged lug is fixedly installed on one side wall of the moving contact seat, one end of the blade is rotatably connected with the hinged lug, the static contact seat is fixedly installed on the top of the insulating column one, the static contact piece is fixedly installed on one side wall of the static contact seat, a closing slot is formed in the end of the blade away from the hinged lug, the top of the static contact piece is slidably abutted in the closing slot, and the buffer mechanism is arranged on the static contact seat and used for buffering the impact force generated when the blade and the static contact piece are closed.

[0008] Further provided in the present application is that the buffer mechanism comprises an insulating box, a movable plate, hydraulic oil, an insulating upright column, a buffer spring, and an insulating support plate, the insulating box is fixedly installed on the static contact seat, the movable plate is arranged in the insulating box, the movable plate is in sliding sealing contact with the inner side wall of the insulating box, the hydraulic oil is stored in the insulating box, a plurality of evenly distributed damping holes are formed in the top of the movable plate, the insulating upright column is fixedly installed at the top center of the movable plate, the buffer spring is fixedly installed on the top of the movable plate, the top end of the buffer spring is fixedly connected with the top inner wall of the insulating box, the top end of the insulating upright column extends out of the insulating box, the insulating support plate is fixedly installed on the top end of the insulating upright column, and the end of the blade away from the hinged lug abuts against the upper surface of the insulating support plate.

[0009] Further provided in the present application is that the number of the buffer springs is multiple, and the multiple buffer springs are evenly distributed.

[0010] Further provided in the present application is that the upper surface of the insulating support plate is fixedly installed with an insulating baffle, and the insulating baffle and one side outer wall of the blade are in contact.

[0011] Further provided in the present application is that one side of the contact position between the insulating baffle and the blade is a smooth plane.

[0012] Further provided in the present application is that a round hole is formed in the top center of the insulating box, the top end of the insulating upright column penetrates through the round hole, a sealing ring is fixedly installed on the inner wall of the round hole, and the insulating upright column is in sliding sealing cooperation with the round hole through the sealing ring.

[0013] Further, the number of the buffer mechanisms is two, and the two buffer mechanisms are symmetrically distributed on two sides of the static contact piece.

[0014] Further, the front side wall of the movable contact is provided with a pushing arm which is rotatably installed by a pin shaft, the bottom end of the pushing arm is provided with a connecting arm which is rotatably installed by a pin shaft, a rotating rod is rotatably installed on the base, one end of the connecting arm away from the pushing arm is fixedly connected with the rotating rod, and the end of the rotating rod is provided with an external gear ring.

[0015] The present application has at least one of the following beneficial technical effects:

[0016] 1. The buffer mechanism is used to effectively buffer the impact force generated in the closing moment, so that the movable contact can stably contact the static contact piece to complete the closing operation, the impact force in the closing moment is prevented from being too large to damage the equipment, the service life of the disconnector is prolonged, and stable operation is ensured.

[0017] 2. The insulating baffle is used to guide the movement of the movable contact in the closing process, so that the movable contact moves more stably, the closing process of the movable contact is ensured to be smooth, and the accuracy and reliability of the closing are further improved.

[0018] 3. The two sets of buffer mechanisms symmetrically distributed on two sides of the static contact piece are used to uniformly distribute the buffer force received by the movable contact in the closing process, so that the deformation or deviation of the movable contact or the static contact piece caused by uneven force is avoided, and the stability and reliability in the closing process are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of the embodiment.

[0020] Figure 2 is a schematic diagram of the three-dimensional structure of the movable contact.

[0021] Figure 3 is a schematic diagram of the three-dimensional structure of the static contact seat and the buffer mechanism.

[0022] Figure 4 is a sectional view of the buffer mechanism.

[0023] In the figure, 1 is a base, 2 is an insulating column I, 3 is an insulating column II, 4 is a movable contact seat, 5 is a hinged lug, 6 is a movable contact, 7 is a static contact seat, 8 is a static contact piece, 9 is a buffer mechanism, 91 is an insulating box, 92 is a movable plate, 93 is hydraulic oil, 94 is a damping hole, 95 is an insulating stand, 96 is a buffer spring, 97 is an insulating support plate, 98 is an insulating baffle, 99 is a sealing ring, 10 is a closing slot, 11 is a pushing arm, 12 is a connecting arm, and 13 is a rotating rod. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely in combination with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present application provides a closing mechanism of an isolating switch, comprising a base 1, an insulating column 2, an insulating column 3, a moving contact seat 4, a hinged lug 5, a blade 6, a static contact seat 7, a static contact piece 8 and a buffer mechanism 9, the insulating column 2 and the insulating column 3 are both fixedly installed on the top of the base 1, the moving contact seat 4 is fixedly installed on the top of the insulating column 3, the hinged lug 5 is fixedly installed on one side wall of the moving contact seat 4, one end of the blade 6 is rotatably connected with the hinged lug 5, the static contact seat 7 is fixedly installed on the top of the insulating column 2, the static contact piece 8 is fixedly installed on one side wall of the static contact seat 7, the end of the blade 6 away from the hinged lug 5 is provided with a closing slot 10, and the top of the static contact piece 8 is slidably abutted in the closing slot 10.

[0026] The buffer mechanism 9 is arranged on the static contact seat 7, and is used for buffering the impact force generated when the movable contact 6 is closed with the static contact 8. The buffer mechanism 9 comprises an insulating box 91, a movable plate 92, hydraulic oil 93, an insulating column 95, a buffer spring 96 and an insulating support plate 97. The insulating box 91 is fixedly installed on the static contact seat 7. The movable plate 92 is arranged in the insulating box 91 and is in sliding sealing contact with the inner side wall of the insulating box 91. The hydraulic oil 93 is stored in the insulating box 91. A plurality of damping holes 94 are formed in the top of the movable plate 92 in a uniform distribution. The insulating column 95 is fixedly installed at the top center of the movable plate 92. The buffer spring 96 is fixedly installed at the top of the movable plate 92. The top end of the buffer spring 96 is fixedly connected with the top inner wall of the insulating box 91. The number of the buffer spring 96 is multiple, and the multiple buffer springs 96 are uniformly distributed. The top end of the insulating column 95 extends out of the insulating box 91. The insulating support plate 97 is fixedly installed at the top end of the insulating column 95. The end of the movable contact 6 away from the hinged lug 5 is in abutment with the upper surface of the insulating support plate 97. The insulating support plate 97 provides a stable abutment support surface for the movable contact 6, so that the movable contact 6 can accurately contact the static contact 8 and maintain a good contact state when being closed. When the movable contact 6 is closed with the static contact 8, the buffer spring 96 can absorb energy by using the elastic force of the buffer spring 96 itself, so as to convert the impact force into elastic potential energy. The hydraulic oil 93 can further absorb energy by using the flow process of the hydraulic oil 93 through the damping holes 94. The damping force generated by the hydraulic oil 93 passing through the damping holes 94 can effectively inhibit the reciprocating bouncing of the buffer spring 96 after absorbing energy, so as to effectively buffer the impact force generated in the closing moment, avoid the damage to the equipment caused by the excessive impact force in the closing moment, prolong the service life of the disconnector and ensure the stable operation of the disconnector.

[0027] In the embodiment, the upper surface of the insulating support plate 97 is fixedly installed with an insulating baffle 98. The insulating baffle 98 is arranged at the joint between the one side outer wall of the movable contact 6 and the insulating support plate 97. The joint between the insulating baffle 98 and the movable contact 6 is a smooth plane. The insulating baffle 98 can play a certain guiding role in the closing process, so that the movable contact 6 moves more stably and the closing process of the movable contact 6 is smooth. The insulating baffle 98 can also prevent the movable contact 6 from deviating too much, so as to further improve the accuracy and reliability of the closing.

[0028] In the embodiment, a circular hole is formed at the top center of the insulating box 91. The top end of the insulating column 95 penetrates through the circular hole. A sealing ring 99 is fixedly installed on the inner wall of the circular hole. The insulating column 95 is in sliding sealing cooperation with the circular hole through the sealing ring 99. The sealing ring 99 ensures the sealing property of the insulating box 91 and prevents the hydraulic oil 93 from leaking.

[0029] In the embodiment, the number of buffering mechanisms 9 is set to two groups, and the two groups of buffering mechanisms 9 are symmetrically distributed on both sides of the static contact 8. By arranging the two groups of buffering mechanisms 9 symmetrically distributed on both sides of the static contact 8, the buffering force received by the switch blade 6 during closing can be uniformly distributed, the deformation or deviation of the switch blade 6 or the static contact 8 caused by uneven force can be avoided, and the stability and reliability during closing are enhanced.

[0030] In the embodiment, the push arm 11 is rotatably installed on the front side wall of the switch blade 6 through a pin shaft, the bottom end front side of the push arm 11 is rotatably installed with the connecting arm 12 through a pin shaft, the rotating rod 13 is rotatably installed on the base 1, the end of the connecting arm 12 away from the push arm 11 is fixedly connected with the rotating rod 13, and the end of the rotating rod 13 is provided with an external gear ring. Through the connection structure of the push arm 11, the connecting arm 12 and the rotating rod 13, external driving force can be conveniently transmitted to the switch blade 6 to realize the rotating closing and opening actions of the switch blade 6, the operation is convenient, and the practical application and operation control of the disconnecting switch in the power system are facilitated. It should be noted that the setting, transmission principle and driving mode of the push arm 11, the connecting arm 12 and the rotating rod 13 have been described in detail in the patent document with the authorization announcement number CN212625346U, and therefore will not be described in detail herein.

[0031] Through the above structure, the working principle of the closing mechanism of the disconnecting switch provided by the application is as follows:

[0032] From the perspective of the rotating rod 13, the rotating rod 13 drives the connecting arm 12 to rotate clockwise, the connecting arm 12 drives the switch blade 6 to rotate through the push arm 11, at this time, the switch blade 6 rotates counterclockwise with the hinge of the hinge ear 5 as the center, that is, the end of the switch blade 6 away from the hinge ear 5 moves towards the static contact 8, so that the static contact 8 gradually inserts into the closing slot 10 at the end of the switch blade 6, and the closing operation is completed. Figure 1 Conversely, from the perspective of the rotating rod 13, the end of the switch blade 6 away from the hinge ear 5 moves away from the static contact 8, the static contact 8 gradually slides out of the closing slot 10 at the end of the switch blade 6, and the opening operation is completed. Figure 1

[0033] ​When the contact 6 rotates to close the switch, the end of the contact 6 will be in contact with the insulating support plate 97. As the contact 6 continues to rotate, the insulating support plate 97 will be subjected to downward pressure. The insulating support plate 97 will then transmit the force to the insulating column 95. The insulating column 95 will push the movable plate 92 to slide downward in the insulating box 91. Since the movable plate 92 is in sliding sealing contact with the inner side wall of the insulating box 91, the hydraulic oil 93 below the movable plate 92 will slowly flow to the upper side of the movable plate 92 through the damping holes 94. The hydraulic oil 93 will generate a damping force when flowing through the damping holes 94, which can preliminarily buffer the impact force during the closing process. At the same time, as the movable plate 92 moves downward, the multiple buffer springs 96 are compressed. The buffer springs 96 can further convert the impact force into elastic potential energy and store it. The damping force generated by the hydraulic oil 93 passing through the damping holes 94 can effectively suppress the reciprocating bouncing of the buffer springs 96 after absorbing energy, thereby effectively buffering the impact force generated at the moment of closing. This allows the contact 6 to stably contact the static contact 8 to complete the closing operation.

Claims

1. A closing mechanism for a disconnecting switch, characterized in that, The circuit includes a base (1), an insulating post one (2), an insulating post two (3), a moving contact seat (4), a hinge ear (5), a switch (6), a stationary contact seat (7), a stationary contact piece (8), and a buffer mechanism (9). The insulating post one (2) and the insulating post two (3) are both fixedly installed on the top of the base (1). The moving contact seat (4) is fixedly installed on the top of the insulating post two (3). The hinge ear (5) is fixedly installed on one side wall of the moving contact seat (4). One end of the switch (6) is connected to the hinge ear (5). The stationary contact seat (7) is fixedly installed on the top of the insulating column (2), and the stationary contact piece (8) is fixedly installed on one side wall of the stationary contact seat (7). The end of the switch (6) away from the hinge ear (5) is provided with a closing groove (10). The top of the stationary contact piece (8) slides against the closing groove (10). The buffer mechanism (9) is provided on the stationary contact seat (7). The buffer mechanism (9) is used to buffer and deflect the impact force generated when the switch (6) and the stationary contact piece (8) are closed.

2. The closing mechanism of the disconnecting switch according to claim 1, characterized in that: The buffer mechanism (9) includes an insulating box (91), a movable plate (92), hydraulic oil (93), an insulating column (95), a buffer spring (96), and an insulating support plate (97). The insulating box (91) is fixedly installed on the stationary contact seat (7). The movable plate (92) is disposed inside the insulating box (91). The movable plate (92) slides and seals against the inner wall of the insulating box (91). The hydraulic oil (93) is stored inside the insulating box (91). The top of the movable plate (92) has multiple evenly distributed damping holes (96). 4) The insulating column (95) is fixedly installed at the top center of the movable plate (92), the buffer spring (96) is fixedly installed at the top of the movable plate (92), the top end of the buffer spring (96) is fixedly connected to the top inner wall of the insulating box (91), the top end of the insulating column (95) extends to the outside of the insulating box (91), the insulating support plate (97) is fixedly installed at the top end of the insulating column (95), and the end of the switch (6) away from the hinge ear (5) abuts against the upper surface of the insulating support plate (97).

3. The closing mechanism of the disconnecting switch according to claim 2, characterized in that: The number of the buffer springs (96) is set to multiple, and the multiple buffer springs (96) are evenly distributed.

4. The closing mechanism of the disconnecting switch according to claim 3, characterized in that: An insulating baffle (98) is fixedly installed on the upper surface of the insulating support plate (97), and the insulating baffle (98) is connected to one side of the outer wall of the switch (6).

5. The closing mechanism of the disconnecting switch according to claim 4, characterized in that: The side where the insulating baffle (98) and the knife switch (6) meet is a smooth plane.

6. The closing mechanism of the disconnecting switch according to claim 5, characterized in that: The insulating box (91) has a circular hole at the top center. The top of the insulating column (95) passes through the circular hole. A sealing ring (99) is fixedly installed on the inner wall of the circular hole. The insulating column (95) slides and seals with the circular hole through the sealing ring (99).

7. The closing mechanism of the disconnecting switch according to claim 6, characterized in that: The number of the buffer mechanism (9) is set to two sets, and the two sets of buffer mechanism (9) are symmetrically distributed on both sides of the stationary contact piece (8).

8. The closing mechanism of the disconnecting switch according to claim 1, characterized in that: A push arm (11) is rotatably mounted on the front side wall of the guillotine (6) via a pin. A connecting arm (12) is rotatably mounted on the front side of the bottom end of the push arm (11) via a pin. A rotating rod (13) is rotatably mounted on the base (1). The end of the connecting arm (12) away from the push arm (11) is fixedly connected to the rotating rod (13). An external gear ring is provided at the end of the rotating rod (13).

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