A double-acting transmission device for an arc extinguishing chamber and its transmission method

Abstract

The present invention discloses a double-acting transmission device for an arc extinguishing chamber and its transmission method, which includes an active rack, an active gear, a rotating shaft, a transmission pin, a passive rack, a passive gear, a guide rail frame, a limit pin, a limit spring and a spring plug. The active rack is connected to the connecting piece of the arc extinguishing chamber. The active gear and the passive gear are concentrically installed on the rotating shaft, and the rotating shaft is fixedly connected to the guide rail frame. The active gear is provided with a U-shaped groove, and the passive gear is fixedly connected to the transmission pin. The transmission pin passes through the U-shaped groove to drive the passive gear to rotate. The passive gear meshes with the passive rack to make it move horizontally. The passive rack is connected to the static arc contact. The limit pin and the limit spring are both embedded in the spring plug, and the spring plug is fixed on the guide rail frame. The limit pin restricts the rotation of the passive gear at the closing / opening position. The present invention has the characteristics of compact structure, precise transmission, easy processing of parts and strong reliability, and realizes the different-time and different-speed movement of the dynamic and static sides of the arc extinguishing chamber.

Description

Technical Field:

[0001] The present invention belongs to the technical field of high - voltage circuit breakers, and specifically relates to a double - acting transmission device for an arc - extinguishing chamber and its transmission method. Background Art:

[0002] Figure 1 It is a typical double - acting double - gas - chamber arc - extinguishing chamber structure. The piston on the moving arc contact 33 assembly isolates the gas chamber into two parts, namely the thermal expansion chamber 34 and the compression chamber 36, and there is a one - way valve 35 between the two chambers. The nozzle 31 on the moving side is connected to the push - pull rod 30 through a connecting piece, and there is a pin 27 on the push - pull rod 30. The static arc contact 32 on the static side is fixed together with the rack 29 and can move axially. The fork 28 is fixed on the guide rail frame, and its lower part is a partial gear and can rotate around its center.

[0003] During opening, the moving - side part moves to the right along with the pull rod, and the push - pull rod 30 moves to the right together with the nozzle 31. The pin 27 on the push - pull rod 30 will contact the fork 28 during the movement to the right, causing the fork 28 to rotate clockwise. The clockwise - rotating fork 28 drives the rack 29 to move to the left through the gear at its lower part, and the static arc contact 32 on the static side moves to the left simultaneously following the rack 29. During closing, it is the reverse process of the above. Thus, a double - acting structure in which the moving and static contacts move in opposite directions is formed.

[0004] The key device for realizing double - acting in this structure is the fork - rack structure composed of the push - pull rod 30 and the pin 27, fork 28, and rack 29 on it. In addition, there are other forms of double - acting structure devices: such as a connecting - rod drive structure, a rotating cam structure with a special - shaped guide, a fork - connecting - rod drive structure, etc.

[0005] In the prior art, the double - acting structure using a fork - rack device is relatively close to the present invention. The nozzle 31 on the moving - side part is connected with a push - pull rod 30, and there is a pin 27 on the push - pull rod 30. The static arc contact 32 on the static side is fixed together with the rack 29 and can move axially. The fork 28 is fixed on the guide rail frame, and its lower part is a partial gear and can rotate around its center.

[0006] The main problems of this structure are that the shapes of the parts push - pull rod 30 and fork 28 are relatively complex, and the processing difficulty is high; the transmission accuracy of the push - pull rod 30 and fork 28 is low; the stroke of the pin 27 on the guide rail is large and it is easy to wear; the opening and closing speeds of the pin 27 and the moving - side part are the same. In the case of a relatively large opening speed, the collision force between the pin 27 and the fork 28 is large, and there may be a risk of fracture. Summary of the Invention:

[0007] To solve the above - mentioned technical problems, the present invention provides a double - acting transmission device for an arc - extinguishing chamber and its transmission method.

[0008] To achieve the above object, the present invention is realized through the following technical solutions:

[0009] A double-acting transmission device for an arc extinguishing chamber, comprising an active rack, an active gear, a rotating shaft, a transmission pin, a passive rack, a passive gear, a guide rail frame, a limit pin, a limit spring and a spring plug. The active rack is connected to the connecting part of the arc extinguishing chamber. The active gear and the passive gear are concentrically installed on the rotating shaft. The rotating shaft is fixedly connected to the guide rail frame. The active gear is provided with a U-shaped groove. The passive gear is fixedly connected to the transmission pin. The transmission pin passes through the U-shaped groove to drive the passive gear to rotate. The passive gear meshes with the passive rack to make it move horizontally. The passive rack is connected to the static arc contact. The limit pin and the limit spring are both embedded in the spring plug. The spring plug is fixed on the guide rail frame. The limit pin restricts the rotation of the passive gear at the closing / opening position.

[0010] Furthermore, the active gear and the passive gear adopt different pitch circle sizes.

[0011] Furthermore, the width of the U-shaped groove is greater than the diameter of the transmission pin. The arc length change of the U-shaped groove can meet the requirement of realizing the static side delay movement.

[0012] Furthermore, the center of the active gear coincides with the center of the U-shaped groove.

[0013] Furthermore, the passive gear is provided with two limit semi-circular holes. A limit pin guide rail for cooperating with the limit pin is arranged along the circumferential direction between the two limit semi-circular holes.

[0014] Furthermore, the limit pin can move along its axial direction.

[0015] Furthermore, the depth of the limit semi-circular hole is greater than the depth of the limit pin guide rail.

[0016] Furthermore, the fixed connection mode of the transmission pin and the passive gear is integral machining, welding or bolt connection.

[0017] Furthermore, the distance between the center of the active gear and the center of the U-shaped groove arc is equal to the distance between the center of the passive gear and the center of the transmission pin.

[0018] Furthermore, a transmission method for a double-acting transmission device for an arc extinguishing chamber includes the following steps:

[0019] a. When the active side part drives the active rack to move downward / upward, the active rack meshes with the active gear to rotate clockwise / counterclockwise. When the active gear rotates to the end of the U-shaped groove and contacts the transmission pin, the transmission pin follows the active gear to rotate clockwise / counterclockwise.

[0020] b. When the driving pin and the driven gear start to rotate clockwise / counterclockwise and engage with each other, the driven rack moves upward / downward. At this time, the static arc contact on the static side follows the upward / downward movement of the driven rack, causing the static arc contact and the moving arc contact to separate / approach in opposite directions, thereby achieving opening / closing.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention discloses a double-acting transmission device for an arc extinguishing chamber, which includes a driving rack, a driving gear, a rotating shaft, a driving pin, a driven rack, a driven gear, a guide rail frame, a limiting pin, a limiting spring, and a spring plug. The driving rack is connected to the connecting member of the arc extinguishing chamber. The driving gear and the driven gear are concentrically installed on the rotating shaft, and the rotating shaft is fixedly connected to the guide rail frame. The driving gear is provided with a U-shaped groove. The driven gear is fixedly connected to the driving pin, and the driving pin passes through the U-shaped groove to drive the driven gear to rotate. The driven gear engages with the driven rack to make it move horizontally. The driven rack is connected to the static arc contact. The limiting pin and the limiting spring are both embedded in the spring plug, and the spring plug is fixed on the guide rail frame. The limiting pin restricts the rotation of the driven gear at the closing / opening positions. When the driving side part drives the driving rack to move downward / upward, the driving rack engages with the driving gear to rotate clockwise / counterclockwise. When the driving gear rotates to the end of the U-shaped groove and contacts the driving pin, the driving pin and the driving gear rotate simultaneously. Since the driving pin and the driven gear are fixedly connected, the driven gear starts to rotate clockwise / counterclockwise and engages with the driven rack to move upward / downward. At this time, the static arc contact on the static side follows the upward / downward movement of the driven rack, causing the static and moving contacts to separate / approach in opposite directions, thereby achieving opening / closing. This device has a high transmission accuracy, can reliably transmit motion, and at the same time, the processing technology of the gear rack is relatively mature, which can effectively reduce the processing difficulty of parts, reduce costs, has a compact structure, and reduces space occupation.

[0023] Furthermore, the driving gear and the driven gear adopt different pitch circle sizes, which can achieve different speeds of movement on the dynamic and static sides.

[0024] Furthermore, the width of the U-shaped groove is greater than the diameter of the driving pin, ensuring that the driving pin does not contact the large and small arc surfaces on both sides of the U-shaped groove, so as to avoid contact friction and prevent the driving pin from wearing and failing. The change in the arc length of the U-shaped groove can achieve a delayed movement on the static side, which can meet the requirements of different breaker breaking capacities.

[0025] Furthermore, the center of the driving gear coincides with the center of the U-shaped groove, which can reliably transmit motion.

[0026] Furthermore, the driven gear is provided with two limiting semi-circular holes, and a limiting pin guide rail is arranged circumferentially between the two limiting semi-circular holes, which can cooperate with the limiting pin for limiting, avoiding the random rotation of the driven gear during the opening / closing process, and having high reliability.

[0027] Furthermore, the limit pin can move along its axial direction. When in the closing / opening position, the limit spring can push the limit pin into / out of the closing limit semicircular hole so that the driven gear cannot rotate.

[0028] Furthermore, the depth of the limiting semicircular hole is greater than the depth of the limiting pin guide rail. When in the closing position, the limiting pin pushes into the closing limiting semicircular hole, making the passive gear unable to rotate; when opening, the passive gear will cause the limiting pin to be pushed out of the semicircular hole when it is rotated under force and fall into the guide rail on the passive gear, and as the passive gear rotates to the opening position, it falls into the opening limiting semicircular hole. At this time, the passive gear cannot rotate, thereby successfully achieving the closing and opening of the arc extinguishing chamber.

[0029] Furthermore, the transmission pin and the passive gear are fixedly connected by integral processing, welding or bolt connection to ensure that the transmission pin and the passive gear move at a synchronous speed, thereby achieving high transmission accuracy.

[0030] Furthermore, the distance between the center of the driving gear and the center of the U-shaped groove arc is equal to the distance between the center of the driven gear and the center of the transmission pin, ensuring that the driving and driven gears can be installed in coordination. Description of the drawings:

[0031] Figure 1 It is a schematic diagram of the double-action double-chamber arc extinguishing chamber structure in the background technology. Figure 2 It is a schematic diagram of the double-acting transmission device for the arc extinguishing chamber of the present invention.

[0032] Figure 3 It is a cross-sectional view taken along line AA of a schematic diagram of a double-acting transmission device for an arc extinguishing chamber according to the present invention.

[0033] Figure 4 It is a schematic diagram of the limiting structure of the double-action transmission device for the arc extinguishing chamber of the present invention.

[0034] Figure 5 It is a sectional view BB of the limiting structure of the double-acting transmission device for the arc extinguishing chamber of the present invention (a is the sectional view BB, and b is a partially enlarged schematic view of the sectional view BB).

[0035] Figure 6 Schematic diagram of the passive gear of the present invention (a is a main view, b is a sectional view, c is a rear view, and d is a stereogram).

[0036] Figure 7 Schematic diagram of the driving gear and DD sectional view of the present invention (a is the main view, b is the sectional view).

[0037] Figure 8 It is a schematic diagram of the closing state of the double-acting transmission device for the arc extinguishing chamber of the present invention.

[0038] Figure 9It is a schematic diagram of the open state of the double-acting transmission device for the arc extinguishing chamber of the present invention.

[0039] Among them, 1 is a cylinder, 2 is a pressure reducing valve, 3 is a piston, 4 is a moving main contact, 5 is a static arc contact, 6 is a static main contact, 7 is a crossbeam, 8 is a guide rail frame, 9 is a passive rack, 10 is a transmission pin, 11 is a passive gear, 12 is a limit pin, 13 is a limit spring, 14 is a spring plug, 15 is an active rack, 16 is an active gear, 17 is a connecting piece, 18 is a large nozzle, 19 is a small nozzle, 20 is a moving arc contact, 21 is a one-way valve plate, 22 is a pull rod, 23 is a rotating shaft, 24 is a limit semicircular hole, 25 is a limit pin guide rail, 26 is a U-shaped groove, 27 is a pin, 28 is a shift fork, 29 is a rack, 30 is a push-pull rod, 31 is a nozzle, 32 is a static arc contact, 33 is a moving arc contact, 34 is a thermal expansion chamber, 35 is a one-way valve, and 36 is a compressed air chamber. Specific implementation method:

[0040] The present invention is described in further detail below with reference to the accompanying drawings:

[0041] like Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, a double-acting transmission device for an arc extinguishing chamber includes an active rack 15, an active gear 16, a rotating shaft 23, a transmission pin 10, a passive rack 9, a passive gear 11, a guide rail frame 8, a limit pin 12, a limit spring 13 and a spring plug 14. The active rack 15 is connected to the connecting piece 17 of the arc extinguishing chamber, the active gear 16 and the passive gear 11 are concentrically mounted on the rotating shaft 23, the rotating shaft 23 is fixed on the guide rail frame 8, the active gear 16 is provided with a U-shaped groove 26, the passive gear 11 is fixedly connected to the transmission pin 10, the transmission pin 10 passes through the U-shaped groove 26 to drive the passive gear 11 to rotate, the passive gear 11 engages the passive rack 9 to make it move horizontally, the passive rack 9 is connected to the static arc contact 5, the limit pin 12 and the limit spring 13 are both embedded in the spring plug 14, the spring plug 14 is fixed on the guide rail frame 8, and the limit pin limits the rotation of the passive gear when it is in the closing / opening position.

[0042] Specifically, the driving gear 16 and the driven gear 11 have different pitch circle sizes.

[0043] More preferably, the width of the U-shaped groove 26 is greater than the diameter of the driving pin 10, and the change in the arc length of the U-shaped groove 26 can achieve delayed motion of the static side.

[0044] Specifically, the center of the driving gear 16 coincides with the center of the U-shaped groove 26 .

[0045] Specifically, the driven gear 11 is provided with two limiting semicircular holes 24 , and a limiting pin guide rail 25 is provided between the two limiting semicircular holes 24 along the circumferential direction.

[0046] Preferably, the limit pin can move along its own axial direction.

[0047] Specifically, the depth of the limit semi-circular hole 24 is greater than the depth of the limit pin guide rail 25.

[0048] Preferably, the fixed connection method between the driving pin 10 and the passive gear 11 is integral machining, welding or bolt connection.

[0049] Preferably, the distance between the center of the driving gear 16 and the center of the arc of the U-shaped groove 26 is equal to the distance between the center of the passive gear 11 and the center of the driving pin 10.

[0050] Preferably, a driving method for a double-acting transmission device for an arc extinguishing chamber includes the following steps:

[0051] a. When the active side part drives the active rack 15 to move downward / upward, the active rack 15 meshes with the driving gear 16 to rotate clockwise / counterclockwise. When the driving gear 16 rotates to the end of the U-shaped groove 26 and contacts the driving pin 10, the driving pin 10 follows the driving gear 16 to rotate clockwise / counterclockwise.

[0052] b. When the driving pin 10 and the passive gear 11 start to rotate clockwise / counterclockwise and mesh with the passive rack 9 to move upward / downward, at this time, the static arc contact 5 on the static side follows the passive rack 9 to move upward / downward, so that the static arc contact 5 and the dynamic arc contact 20 separate / approach in the opposite direction, realizing opening / closing.

[0053] In Figure 8 and Figure 9 the cylinder 1 and the pressure reducing valve 2 are fixed parts on the active side, and the piston 3, the active main contact 4, the active rack 15, the connecting member 17, the large nozzle 18, the small nozzle 19, the dynamic arc contact 20, the one-way valve plate 21, and the pull rod 22 are active parts on the active side. The static main contact 6, the cross beam 7, and the guide rail frame 8 are fixed parts on the static side and are connected to the fixed frame of the arc extinguishing chamber. The static arc contact 5 and the passive rack 9 are passive parts on the static side.

[0054] In Figure 8 and Figure 9 the cylinder 1 and the pressure reducing valve 2 are fixedly connected together and are fixed to the arc extinguishing chamber frame at the same time, playing a role in positioning and guiding when the parts on the active side move. The static main contact 6, the cross beam 7, and the guide rail frame 8 are fixedly connected together and are fixed to the flange connecting the arc extinguishing chamber and the frame at the same time. The static main contact 6 plays a role in fixing the static parts on the static side and guiding the parts on the active side; the guide rail frame 8 plays a role in installing and guiding the transmission parts; the cross beam 7 plays a role in connecting the static main contact 6 and the guide rail frame 8.

[0055] In Figure 8 and Figure 9In it, the pull rod 22 is connected to the operating mechanism to provide the main power for movement. The piston 3 is directly connected to the pull rod 22, isolating the air chamber into the upper thermal expansion chamber 34 and the lower compressed air chamber 36. The one-way valve plate 21 is located on the piston 3. When interrupting a large current, the energy of the arc in the thermal expansion chamber 34 heats the gas, causing its pressure to increase significantly. At this time, the one-way valve plate 21 is closely attached to the piston, and the gas in the compressed air chamber 36 cannot enter the thermal expansion chamber 34. The arc is extinguished by relying on the high-pressure gas in the thermal expansion chamber 34. When interrupting a small current, the arc energy in the thermal expansion chamber 34 is not sufficient to heat the gas to cause a significant increase in pressure. At this time, the one-way valve plate 21 opens, and the high-pressure gas formed by compressing the gas in the compressed air chamber 36 passes through the thermal expansion chamber 34 to extinguish the arc. The small nozzle 19 is connected to the pull rod 22 through the moving arc contact 20. The driving rack 15 is connected to the pull rod 22 through the connecting member 17, the large nozzle 18, the moving main contact 4, and the piston 3, and can move axially along with the pull rod 22. The driving rack 15 is the driving part of the double-acting device.

[0056] In Figure 8 and Figure 9 it, the driven rack 9 is connected to the static arc contact 5 and can move axially. The driven rack 9 is the driven part of the double-acting device.

[0057] In Figure 8 and Figure 9 it, the driven gear 11 and the driving gear 16 are installed on the guide rail frame 8 and can rotate around their centers. The driving gear 16 meshes with the driving rack 15 to form a driving kinematic pair; the driven gear 11 meshes with the driven rack 9 to form a driven kinematic pair.

[0058] In Figure 4 and Figure 5 it, the limit pin 12, the limit spring 13, and the spring plug 14 are installed on the guide rail frame 8. The spherical surface of the limit pin 12 is pushed into the limit groove in the driven gear 11, and the plane of the limit pin 12 contacts the compression spring of the limit spring 13. Both ends of the limit spring 13 contact the limit pin 12 and the spring plug 14 respectively and are in a compressed state, capable of providing a spring reaction force axially. The spring plug 14 is directly connected to the guide rail frame 8, playing a role in supporting and guiding the limit spring 13.

[0059] In Figure 8In it, the arc extinguishing chamber is in the closing state. When it is switched off, the moving part drives the driving rack 15 to move downward. The driving rack 15 drives the driving gear 16 to rotate clockwise through meshing. When the driving gear 16 rotates to the edge of the groove on it and contacts the transmission pin 10, the transmission pin 10 will rotate following the driving gear 16. Since the transmission pin 10 and the driven gear 11 are fixedly connected, the driven gear 11 also starts to move clockwise. The driven gear 11 drives the driven rack 9 to move upward through meshing. At this time, the static arc contact 5 of the static part follows the driven rack 9 to move upward. In this way, the moving and static contacts are separated in opposite directions.

[0060] In Figure 9 In it, the arc extinguishing chamber is in the opening state. When it is switched on, the moving part drives the driving rack 15 to move upward. The driving rack 15 drives the driving gear 16 to rotate counterclockwise through meshing. When the driving gear 16 rotates to the edge of the groove on it and contacts the transmission pin 10, the transmission pin 10 will rotate following the driving gear 16. Since the transmission pin 10 and the driven gear 11 are fixedly connected, the driven gear 11 also starts to move counterclockwise. The driven gear 11 drives the driven rack 9 to move downward through meshing. At this time, the static arc contact 5 of the static part follows the driven rack 9 to move downward. In this way, the moving and static contacts approach in opposite directions.

[0061] Figure 2 It is a structural diagram of a double-acting transmission device. The driven gear 11 and the driving gear 16 are concentrically installed on the rotating shaft 23. The rotating shaft 23 is fixedly connected to the guide rail frame. The driven gear 11 and the driving gear 16 can rotate around their centers, The driving rack 15 and the driving gear 16 are meshed to form a driving kinematic pair, and the rotation of the driving gear 16 is driven by the translation of the driving rack 15. The driven gear 11 and the driven rack 9 are meshed to form a driven kinematic pair, and the translation of the driven rack 9 is driven by the rotation of the driven gear 11. The transmission pin 10 and the driven gear 11 are fixedly connected, and a U-shaped groove 26 is opened on the driving gear 16. The transmission pin 10 passes through the U-shaped groove 26 on the driving gear 16.

[0062] In Figure 2In the closing state, the transmission pin 10 contacts the lower edge of the U-shaped groove 26 on the driving gear 16. When it is opened, the driving rack 15 moves to the right, and the driving gear 16 rotates clockwise through meshing. The lower edge of the U-shaped groove 26 on it disengages from the transmission pin 10, and at this time, the transmission pin 10 does not contact the driving gear 16. The driven gear 11 does not start to rotate under the action of the limiting structure, and the driven rack 9 does not start to move either. When the driving gear 16 rotates to a certain extent, the upper edge of the U-shaped groove 26 on it contacts the transmission pin 10. At this time, the transmission pin 10 rotates following the driving gear 16, driving the driven gear 11 to disengage from the limiting structure and rotate clockwise. The driven gear 11 drives the driven rack 9 to move to the left through meshing, thereby realizing the mutual separation of the static side part and the moving side part.

[0063] In Figure 2 In the opening state, the transmission pin 10 contacts the upper edge of the U-shaped groove 26 on the driving gear 16. When it is closed, the driving rack 15 moves to the left, and the driving gear 16 rotates counterclockwise through meshing. The upper edge of the U-shaped groove 26 on it disengages from the transmission pin 10, and at this time, the transmission pin 10 does not contact the driving gear 16. The driven gear 11 does not start to rotate under the action of the limiting structure, and the driven rack 9 does not start to move either. When the driving gear 16 rotates to a certain extent, the lower edge of the U-shaped groove 26 on it contacts the transmission pin 10. At this time, the transmission pin 10 rotates following the driving gear 16, driving the driven gear 11 to disengage from the limiting structure and rotate counterclockwise. The driven gear 11 drives the driven rack 9 to move to the right through meshing, thereby realizing the mutual approach of the static side part and the moving side part.

[0064] Figure 6 It is the driven gear of the double-acting transmission device. One side of the driven gear 11 is provided with a transmission pin 10, which can be integrally processed with it or fixed together by other means such as welding and bolt connection. On the other side of the driven gear 11, there are closing and opening position limiting semi-circular holes 24. Between the two limiting semi-circular holes 24, there is a limiting pin guide rail 25 along the circumferential direction. The depth of the limiting semi-circular hole 24 is greater than the depth of the limiting pin guide rail 25. In the closing position, the limiting pin 12 is pushed into the closing limiting semi-circular hole 24, and the driven gear 11 cannot rotate. When opening, when the driven gear 11 rotates under force, the limiting pin 12 will be pushed out of the limiting semi-circular hole 24. After the limiting pin 12 is pushed out, it will fall into the limiting pin guide rail 25 on the driven gear 11 and fall into the opening limiting semi-circular hole 24 when the driven gear 11 rotates to the opening position. At this time, the driven gear 11 cannot rotate. The movement principle is the same from the opening position to the closing position.

[0065] Figure 7It is the driving gear of a double-acting transmission device. There is a U-shaped groove 26 on the driving gear 16, and the center of the arc of the U-shaped groove 26 is concentric with the center of the gear. The width of the U-shaped groove 26 is greater than the diameter of the transmission pin 10, so as to ensure that the transmission pin 10 will not contact and wear with the large and small circular surfaces of the U-shaped groove 26. The distance from the center of the driving gear 16 to the center of the arc of its U-shaped groove 26 should be equal to the distance from the center of the driven gear 11 to the center of the transmission pin 10, so as to ensure the mating installation of the driving gear 16 and the driven gear 11.

[0066] Figure 4 and Figure 5 It is the limit structure of a double-acting transmission device. The main components of the limit structure are the limit pin 12, the limit spring 13, and the spring plug 14, which are installed on the guide rail frame 8. The spring plug 14 is fixedly connected to the guide rail frame 8; the limit spring 13 is a compression spring and is located in the spring hole of the guide rail frame 8 and the spring plug 14; the spherical surface of the limit pin 12 extends out of the circular hole of the guide rail frame 8 to contact the driven gear 11, the plane of the limit pin 12 contacts the limit spring 13, and the limit pin 12 can move along its axial direction.

[0067] When in the closing (opening) position, the limit pin 12 is pushed into the closing (opening) position limit semi-circular hole 24 on the driven gear 11 by the spring force. At this time, if the driven gear 11 is not subjected to a large external force, it cannot rotate, playing the role of closing (opening) limit. When it opens (closes), the driven gear 11 starts to rotate along with the transmission pin 10. At this time, the external force received is large, and the arc surface in the semi-circular hole can push up the spherical surface on the limit pin 12 and enter the limit pin guide rail 25 on the driven gear 11. When reaching the opening (closing) position, the spherical surface of the limit pin 12 falls into the opening (closing) position limit semi-circular hole 24 on the driven gear 11 due to the spring force. At this time, the driven gear 11 is still not subjected to an external force and cannot rotate, playing the role of opening (closing) limit.

[0068] In the above double-acting transmission structure, the U-shaped groove is arranged on the driving gear, and the transmission pin is arranged on the driven gear. It is also possible to adopt a structure where the U-shaped groove is arranged on the driven gear and the transmission pin is arranged on the driving gear, and the same purpose can be achieved through the same principle, which belongs to the scope protected by this invention.

Claims

1. A double-acting transmission device for an arc extinguishing chamber, characterized in that: The invention comprises an active rack (15), an active gear (16), a rotating shaft (23), a transmission pin (10), a passive rack (9), a passive gear (11), a guide rail frame (8), a limit pin (12), a limit spring (13) and a spring plug (14); the active rack (15) is connected to a connecting piece (17) of an arc extinguishing chamber; the active gear (16) and the passive gear (11) are coaxially mounted on the rotating shaft (23); the rotating shaft (23) is fixed on the guide rail frame (8); the active gear (16) is provided with a U-shaped The driven gear (11) is fixedly connected to the transmission pin (10), and the transmission pin (10) passes through the U-shaped groove (26) to drive the driven gear (11) to rotate. The driven gear (11) engages with the driven rack (9) to make it move horizontally. The driven rack (9) is connected to the static arc contact (5). The limit pin (12) and the limit spring (13) are both embedded in the spring plug (14). The spring plug (14) is fixed on the guide rail frame (8). The limit pin (12) limits the rotation of the driven gear (11) when it is in the closing / opening position. The width of the U-shaped groove (26) is greater than the diameter of the transmission pin (10), and the arc length change of the U-shaped groove (26) can meet the requirements of the delayed motion of the static side.

2. A double-acting transmission device for an arc extinguishing chamber according to claim 1, characterized in that: The driving gear (16) and the driven gear (11) have different pitch circle sizes.

3. The double-acting transmission device for an arc extinguishing chamber according to claim 1, characterized in that: The center of the driving gear (16) coincides with the center of the U-shaped groove (26).

4. A double-acting transmission device for an arc extinguishing chamber according to claim 1, characterized in that: The passive gear (11) is provided with two limiting semicircular holes (24), and a limiting pin guide rail (25) cooperating with the limiting pin (12) is provided between the two limiting semicircular holes (24) along the circumferential direction.

5. A double-acting transmission device for an arc extinguishing chamber according to claim 4, characterized in that: The limiting pin (12) can move along its axial direction.

6. The double-acting transmission device for an arc extinguishing chamber according to claim 5, characterized in that: The depth of the limiting semicircular hole (24) is greater than the depth of the limiting pin guide rail (25).

7. The double-acting transmission device for an arc extinguishing chamber according to claim 1, characterized in that: The driving pin (10) and the driven gear (11) are fixedly connected by integral processing, welding or bolt connection.

8. The double-acting transmission device for an arc extinguishing chamber according to claim 1, characterized in that: The distance between the center of the driving gear (16) and the center of the arc of the U-shaped groove (26) is equal to the distance between the center of the driven gear (11) and the center of the transmission pin (10).

9. A transmission method for a double-acting transmission device for an arc extinguishing chamber, characterized in that: A double-acting transmission device for an arc extinguishing chamber according to any one of claims 1 to 8 comprises the following steps: a. When the active side portion drives the active rack (15) to move downward / upward, the active rack (15) engages with the active gear (16) and rotates clockwise / counterclockwise. When the active gear (16) rotates to the end of the U-shaped groove (26) and contacts the transmission pin (10), the transmission pin (10) rotates clockwise / counterclockwise following the active gear (16); b. When the transmission pin (10) and the driven gear (11) start to rotate clockwise / counterclockwise and the meshing driven rack (9) moves upward / downward, the static arc contact (5) on the static side follows the driven rack (9) to move upward / downward, so that the static arc contact (5) and the moving arc contact (20) separate / approach in opposite directions, thus realizing opening / closing.

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