阅读说明：本技术 一种真空灭弧室 (Vacuum arc extinguish chamber ) 是由 刘庆 毕迎华 马朝阳 杨帆 林麟 薛从军 李永林 王向克 李旭旭 孙广雷 何创伟 于 2020-12-01 设计创作，主要内容包括：本发明涉及一种真空灭弧室,包括：静触头结构,包括导电连接的静主触头和静弧触头,静弧触头活动装配在静主触头中；动触头结构包括导电连接的动主触头和动弧触头；动主触头和静主触头用于正常通流,动弧触头和静弧触头用于灭弧；所述静主触头和动主触头中的其中一个主触头具有锥形外周面,另一个主触头具有锥形凹部,该锥形凹部具有锥形内周面,锥形内周面在合闸时用于与所述锥形外周面吻合插配,以实现正常通流。该真空灭弧室中,在分合闸过程中,主触头和弧触头完全分离,有效提高了真空灭弧室的通流能力,而且,利用动主触头和静主触头之间锥形吻合插配,可有效增加通流面积,改善通流能力。(The invention relates to a vacuum interrupter comprising: the static contact structure comprises a static main contact and a static arc contact which are in conductive connection, and the static arc contact is movably assembled in the static main contact; the moving contact structure comprises a moving main contact and a moving arc contact which are in conductive connection; the movable main contact and the static main contact are used for normal through-flow, and the movable arc contact and the static arc contact are used for arc extinction; one main contact of the static main contact and the movable main contact is provided with a conical outer peripheral surface, the other main contact is provided with a conical concave part, the conical concave part is provided with a conical inner peripheral surface, and the conical inner peripheral surface is matched with the conical outer peripheral surface in an insertion mode when the switch is switched on so as to achieve normal through flow. In the vacuum arc extinguish chamber, the main contact and the arc contact are completely separated in the switching-on and switching-off process, so that the through-flow capacity of the vacuum arc extinguish chamber is effectively improved, and the through-flow area can be effectively increased and the through-flow capacity can be improved by utilizing the conical fit between the movable main contact and the static main contact.)

1. A vacuum interrupter, comprising:

the arc extinguish chamber shell (15) is internally provided with a static contact structure and a moving contact structure;

the static contact structure comprises a static main contact (3) and a static arc contact (6) which are in conductive connection, wherein the static main contact (3) is in a sleeve shape, and the static arc contact (6) is movably assembled in the static main contact (3);

the moving contact structure comprises a moving main contact (9) and a moving arc contact (7) which are in conductive connection;

the movable main contact (9) and the static main contact (3) are used for normal through-flow, and the movable arc contact (7) and the static arc contact (6) are used for arc extinction;

the static arc contact (6) is arranged in a manner of protruding out of the static main contact (3) along the direction towards the movable contact structure, the movable arc contact (7) is arranged in a manner of protruding out of the movable main contact (9) along the direction towards the static contact structure, during switching-on, the movable arc contact (7) and the static arc contact (6) are in contact with the static main contact (3) before the movable main contact (9), and during switching-off, the movable arc contact (7) and the static arc contact (6) are separated from the movable main contact (9) and the static main contact (3) after the movable main contact (9);

it is characterized in that the preparation method is characterized in that,

one of the static main contact (3) and the movable main contact (9) is provided with a conical outer peripheral surface (31), the other main contact is provided with a conical concave part (92), the conical concave part (92) is provided with a conical inner peripheral surface, and the conical inner peripheral surface is matched and inserted with the conical outer peripheral surface (31) when the switch is switched on so as to realize normal through-flow.

2. Vacuum interrupter according to claim 1, characterized in that the respective main contact of the stationary main contact (3) and the moving main contact (9) with the conical recess (92) comprises a plurality of contact lobes (91), all contact lobes (91) being evenly distributed at circumferential intervals, the inner side faces of all contact lobes (91) cooperating to form the conical inner circumferential surface.

3. Vacuum interrupter according to claim 2, characterized in that the respective main contacts of the static main contact (3) and the dynamic main contact (9) with the conical recess (92) are jacketed with a contact shield (8).

4. Vacuum interrupter according to claim 1, 2 or 3, characterized in that the static contact structure is located directly above the moving contact structure, the moving contact structure reciprocates vertically to perform the switching operation, the moving main contact (9) has the tapered recess (92), and the tapered recess (92) is arranged upward.

5. The vacuum arc-extinguishing chamber according to claim 4, characterized in that the moving main contact (9) is in a sleeve shape, the moving arc contact (7) comprises a lower rod part (72) and a lower head part (71), the lower head part (71) is used for being in conductive contact with the static arc contact (6), the lower rod part (72) is assembled in the moving main contact (9) in a sliding and conductive mode along the up-down direction, the moving conductive rod (13) is fixedly connected to the lower end of the moving main contact (9), the moving end corrugated pipe (12) is sleeved on the lower rod part (72), one end of the moving end corrugated pipe (12) is fixedly connected with the moving conductive rod (13), and the other end of the moving end corrugated pipe is fixedly connected with the lower rod part (72).

6. The vacuum arc-extinguishing chamber according to claim 5, characterized in that a lower assembling groove is arranged at the center of the upper end of the movable conducting rod (13), a lower guide sleeve (17) is arranged in the lower assembling groove, the lower guide sleeve (17) extends along the up-down direction, and the lower end of the lower rod part (72) is inserted into the lower guide sleeve (17) in a guiding manner.

7. The vacuum arc-extinguishing chamber according to claim 6, characterized in that the lower rod part (72) is provided with a lower connecting flange, the movable end corrugated pipe (12) is sleeved outside the lower guide sleeve (17), the upper end of the movable end corrugated pipe (12) is connected with the lower connecting flange in a welding manner, and the lower end of the movable end corrugated pipe is connected with the bottom of the lower assembling groove in a welding manner.

8. The vacuum arc-extinguishing chamber according to claim 7, characterized in that an upper assembling groove is arranged at the center of the lower end face of the movable main contact (9), the upper assembling groove and the lower assembling groove are correspondingly buckled, and after the brake is opened, under the reset action of the movable end corrugated pipe (12), the movable arc contact (7) moves upwards until the lower connecting flange is in stop fit with the bottom of the upper assembling groove.

9. The vacuum arc-extinguishing chamber according to claim 1, 2 or 3, characterized in that the stationary contact structure is located directly above the movable contact structure, the upper end of the stationary main contact (3) is fixedly connected with a stationary conductive end cap (1), the stationary conductive end cap (1) is fixedly arranged on the arc-extinguishing chamber housing (15), the stationary arcing contact (6) comprises an upper head portion (61) and an upper rod portion (62), the upper head portion (61) is electrically connected with the movable arcing contact (7), the upper rod portion (62) is slidably and conductively assembled in the stationary main contact (3), the stationary conductive end cap (1) is provided with an upper guide sleeve (16), the upper guide sleeve (16) extends in the up-down direction, the upper end of the upper rod portion (62) is guided and inserted in the upper guide sleeve (16), the stationary corrugated tube (2) is sleeved outside the upper guide sleeve (16), and the upper end of the stationary corrugated tube (2) is fixedly connected with the stationary conductive end cap (1), the lower end is fixedly connected with the lower rod part (72).

10. The vacuum interrupter according to claim 9, wherein an upper mounting groove is formed in the center of the lower side of the stationary conductive end cap (1), a lower mounting groove is formed in the center of the upper side of the stationary main contact (3), the two mounting grooves are correspondingly buckled, an upper connecting flange is formed on the upper rod portion (62), the lower end of the stationary corrugated tube (2) is welded to the upper connecting flange, and after the opening operation is completed, the stationary arcing contact (6) moves downward until the upper connecting flange is matched with the stop of the bottom of the lower mounting groove under the reset action of the stationary corrugated tube (2).

Technical Field

The invention belongs to the technical field of vacuum switches, and particularly relates to a vacuum arc extinguish chamber.

Background

With the development of economy, the vacuum circuit breaker has become a hot point of research at home and abroad by gradually replacing a sulfur hexafluoride circuit breaker with the characteristics of environmental friendliness, long service life, no maintenance and the like, and for a vacuum arc-extinguishing chamber, the difficulty lies in how to conduct rated current under normal conditions and break fault current under fault conditions.

In the chinese utility model patent with the publication number CN2023076740U, a vacuum interrupter is disclosed, although the static contact includes an arc contact and a main contact which are separately arranged, the moving contact still has an integrated structure of the main contact and the arc contact, even if the structure of the longitudinal magnetic field contact with the best breaking capability and suitable for high voltage and large breaking capacity is adopted, the through-current capability of the moving contact is still inferior to that of a simple main contact conductor under the effect of the ac skin effect. The invention discloses a vacuum arc-extinguishing chamber in Chinese patent application with application publication No. CN111463061A, wherein a static main contact is provided with a channel extending along the plugging direction, a static arc contact is movably and conductively assembled in the channel of the static main contact along the plugging direction, a movable main contact is in a cylindrical shape with an opening at one end and is sleeved outside a movable arc contact, the main contact is separated from the arc contact no matter the static end or the movable end, the static main contact is in butt joint communication with the movable main contact during closing, the through-flow capacity of the arc-extinguishing chamber is ensured, and when the vacuum arc-extinguishing chamber is opened, the movable arc contact and the static arc contact which adopt a coil magnetic field structure break electric arcs, so that the performance of the vacuum arc-extinguishing chamber for through-flow and open-break.

In the existing vacuum arc extinguish chamber with a composite contact structure with a main contact and an arc contact separated, when switching-on current is transmitted, a movable main contact and a static main contact are in a plane butt joint mode, the contact performance of a channel completely depends on the size of a contact plane, if the vacuum arc extinguish chamber is expected to obtain larger through-current capacity and better temperature rise performance, the radial size of the main contact needs to be enlarged, the radial size of the vacuum arc extinguish chamber is enlarged, the vacuum arc extinguish chamber is not in accordance with the development idea of miniaturization of the vacuum arc extinguish chamber, and the through-current capacity of a movable contact and a static contact adopting the composite contact structure cannot be effectively improved.

Disclosure of Invention

The invention aims to provide a vacuum arc-extinguishing chamber, which aims to solve the technical problem that the current capacity cannot be effectively improved because the plane of a main contact in a fixed contact and a movable contact of a composite contact structure is butted to transfer closing current in the prior art.

In order to achieve the purpose, the technical scheme of the vacuum arc-extinguishing chamber provided by the invention is as follows: a vacuum interrupter, comprising:

the arc extinguish chamber shell is internally provided with a static contact structure and a moving contact structure;

the static contact structure comprises a static main contact and a static arc contact which are in conductive connection, the static main contact is in a sleeve shape, and the static arc contact is movably assembled in the static main contact;

the moving contact structure comprises a moving main contact and a moving arc contact which are in conductive connection;

the movable main contact and the static main contact are used for normal through-flow, and the movable arc contact and the static arc contact are used for arc extinction;

the static arc contact is arranged in a manner of protruding out of the static main contact along the direction towards the movable contact structure, the movable arc contact is arranged in a manner of protruding out of the movable main contact along the direction towards the static contact structure, the movable arc contact and the static arc contact are contacted before the movable main contact and the static main contact during switching-on, and the movable arc contact and the static arc contact are separated from the movable main contact and the static main contact after the movable arc contact and the static arc contact during switching-off;

one main contact of the static main contact and the movable main contact is provided with a conical outer peripheral surface, the other main contact is provided with a conical concave part, the conical concave part is provided with a conical inner peripheral surface, and the conical inner peripheral surface is matched with the conical outer peripheral surface in an insertion mode when the switch is switched on so as to achieve normal through flow.

The beneficial effects are that: in the vacuum arc-extinguishing chamber provided by the embodiment, the main contact and the arc contact are completely separated in the switching-on and switching-off process, so that the through-flow capacity of the vacuum arc-extinguishing chamber is effectively improved, and moreover, the through-flow area can be effectively increased and the through-flow capacity is improved by utilizing the conical fit between the movable main contact and the static main contact.

As a further improvement, the corresponding main contact with the conical recess in the static main contact and the dynamic main contact comprises a plurality of contact lobes, all the contact lobes are uniformly distributed at intervals along the circumferential direction, and the inner side surfaces of all the contact lobes are matched to form the conical inner peripheral surface.

The beneficial effects are that: the corresponding arc contact is in a contact lobe structure, so that the elasticity of the main contact can be improved, the contact pressure is ensured, the contact area is ensured, and meanwhile, the centering performance is improved.

As a further improvement, the respective main contacts of the static main contact and the dynamic main contact, which have the tapered recesses, are sheathed with a contact shield.

The beneficial effects are that: the electric field of the respective main contact can be optimized by means of the contact shield.

As a further improvement, the fixed contact structure is located right above the moving contact structure, the moving contact structure reciprocates vertically to realize switching on and off operation, and the moving main contact is provided with the conical concave part which is arranged upwards.

The beneficial effects are that: the conical concave part is arranged upwards, so that abrasive dust falling from the static contact structure can be conveniently received, and particle impurities in the arc extinguish chamber shell are reduced.

As a further improvement, the movable main contact is sleeve-shaped, the movable arc contact comprises a lower rod part and a lower head part, the lower head part is used for being in conductive contact with the static arc contact, the lower rod part is assembled in the movable main contact in a sliding conductive mode along the vertical direction, the lower end of the movable main contact is fixedly connected with a movable conductive rod, a movable end corrugated pipe is sleeved on the lower rod part, one end of the movable end corrugated pipe is fixedly connected with the movable conductive rod, and the other end of the movable end corrugated pipe is fixedly connected with the lower rod part.

The beneficial effects are that: the moving arc contact moves in the moving main contact in a reciprocating way and can be matched with the moving static arc contact for use, and the distance of only a single arc contact when moving is reduced.

As a further improvement, a lower assembly groove is formed in the center of the upper end of the movable conducting rod, a lower guide sleeve is arranged in the lower assembly groove, the lower guide sleeve extends in the vertical direction, and the lower end of the lower rod is inserted into the lower guide sleeve in a guiding mode.

The beneficial effects are that: the lower guide sleeve is arranged in the lower assembling groove at the lower end of the movable conducting rod, so that the lower rod part can be conveniently guided.

As a further improvement, a lower connecting flange is arranged on the lower rod part, the movable end corrugated pipe is sleeved outside the lower guide sleeve, the upper end of the movable end corrugated pipe is connected with the lower connecting flange in a welding mode, and the lower end of the movable end corrugated pipe is connected with the bottom of the lower assembling groove in a welding mode.

The beneficial effects are that: the movable end corrugated pipe is conveniently connected to the lower rod part by the lower connecting flange.

As a further improvement, an upper assembling groove is arranged at the center of the lower end face of the movable main contact, the upper assembling groove and the lower assembling groove are correspondingly buckled, and after the brake is separated, the movable arc contact moves upwards under the reset action of the movable end corrugated pipe until the lower connecting flange is in stop fit with the bottom of the upper assembling groove.

The beneficial effects are that: under the action of the movable end corrugated pipe, the stop matching of the upper assembling groove and the lower connecting flange is conveniently utilized, the opening limit of the movable arc contact is realized, and the movable arc contact can be ensured to accurately protrude out of the movable main contact.

As a further improvement, the fixed contact structure is located directly above the movable contact structure, a fixed end conductive sealing cover is fixedly connected to the upper end of the fixed main contact, the fixed end conductive sealing cover is fixedly arranged on the arc extinguish chamber shell, the fixed arc contact comprises an upper head part and an upper rod part, the upper head part is electrically connected with the movable arc contact, the upper rod part is assembled in the fixed main contact in a sliding and conductive manner, an upper guide sleeve is arranged on the fixed end conductive sealing cover and extends along the vertical direction, the upper end of the upper rod part is inserted into the upper guide sleeve in a guiding manner, a fixed end corrugated pipe is sleeved outside the upper guide sleeve, the upper end of the fixed end corrugated pipe is fixedly connected with the fixed end conductive sealing cover, and the lower end of the fixed end corrugated pipe is fixedly connected with the.

The beneficial effects are that: the upper guide sleeve on the static end conductive sealing cover is used for guiding and assembling the upper rod part, so that effective guiding and limiting are conveniently provided for the static arc contact, and the action progress of the static arc contact is ensured.

As a further improvement, an upper mounting groove is arranged at the central position of the lower side surface of the static end conductive sealing cover, a lower mounting groove is arranged at the central position of the upper side surface of the static main contact, the two mounting grooves are correspondingly buckled, an upper connecting flange is arranged on the upper rod part, the lower end of the static end corrugated pipe is connected with the upper connecting flange in a welding manner, and after the brake is separated, the static arc contact moves downwards until the upper connecting flange is matched with the groove bottom stop of the lower mounting groove under the reset action of the static end corrugated pipe.

The beneficial effects are that: under the action of the static end corrugated pipe, the lower assembling groove and the stop of the upper connecting flange are conveniently utilized to realize the brake separating and limiting of the static arc contact, and the static arc contact can be ensured to accurately protrude out of the static main contact.

Drawings

Fig. 1 is a schematic structural diagram of a vacuum interrupter provided in the present invention in a switching-off state;

fig. 2 is a schematic structural diagram of the vacuum interrupter shown in fig. 1 when closing.

Description of reference numerals:

1. a static end conductive seal cover; 2. a static end bellows; 3. a stationary main contact; 31. a tapered outer peripheral surface; 4. a stationary end guide ring; 5. a stationary end watchband contact finger; 6. a stationary arc contact; 61. an upper head portion; 62. an upper rod part; 7. a moving arc contact; 71. a lower head portion; 72. a lower rod part; 8. a contact shield; 9. a movable main contact; 91. a contact lobe; 92. a tapered recess; 10. the moving end watchband contact finger; 11. a moving end guide ring; 12. a moving end bellows; 13. a movable conductive rod; 14. a lower bellows; 15. an arc extinguishing chamber housing; 16. an upper guide sleeve; 17. and a lower guide sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

The specific embodiment 1 of the vacuum arc-extinguishing chamber provided by the invention is as follows:

in the vacuum arc-extinguishing chamber provided by the embodiment, the static contact structure and the moving contact structure are composite contact structures, namely, the static contact structure and the moving contact structure are respectively provided with a main contact and an arc contact, in addition, the outer peripheral surface of the static main contact 3 is a conical outer peripheral surface 31, the moving main contact 9 is provided with a conical concave portion 92, the inner peripheral surface of the conical concave portion 92 is a conical inner peripheral surface, the conical inner peripheral surface is matched and inserted with the conical outer peripheral surface 31, during closing, the static main contact 3 and the moving main contact 9 can be matched and inserted together, and as the contact surface is a conical surface, compared with the previous plane contact, the flow area can be effectively enlarged, the impedance is reduced, the temperature rise performance is improved, and the performance.

The vacuum arc extinguish chamber has the specific structure as shown in fig. 1 and 2, and comprises an arc extinguish chamber shell 15, wherein a static contact structure and a moving contact structure are arranged in the arc extinguish chamber shell 15, the static contact structure is positioned above the moving contact structure, and the moving contact structure can be driven by a corresponding operating mechanism to move up and down and is used for being matched with the static contact structure to realize switching-on and switching-off operations.

Specifically, the static contact structure here includes a static main contact 3 and a static arc contact 6, a static end conductive seal cover 1 is fixed at the upper end of an arc extinguish chamber shell 15, the upper side surface of the static end conductive seal cover 1 can be welded and connected with a static end wiring conductor for realizing external wiring, the lower end of the static end conductive seal cover 1 is welded and connected with the static main contact 3, the static main contact 3 is of a sleeve structure, the static arc contact 6 is assembled in the static main contact 3 in a guiding and sliding manner along the up-down direction, the static arc contact 6 is of a T-shaped structure and comprises an upper head part 61 and an upper rod part 62, the upper head part 61 is used for being in conductive contact with a dynamic arc contact 7, the upper rod part 62 is positioned above the upper head part 61 and is in guiding and sliding fit with the static main contact 3, the inner hole of the static main contact 3 is a stepped through hole, the stepped through hole includes an upper large-diameter hole section, a middle static end hole section and a lower large-diameter hole section, big footpath hole section is used for holding upper head 61 down, sets up the guide way on the inner hole wall of quiet end path hole section and touches and indicate the mounting groove, sets up quiet end guide ring 4 in the guide way, touches and indicates the mounting groove along upper and lower direction interval arrangement two, every touches and to touch fixed assembly respectively in indicating the mounting groove and touch and indicate 5 with quiet end watchband, upper rod portion 62 slip direction cartridge is in quiet end path hole section to touch through quiet end watchband and indicate 5 and quiet main contact 3 electrically conductive connection.

In addition, in order to provide the elastic restoring force for the static arc contact 6, a static end corrugated pipe 2 is sleeved on the upper rod part 62, the upper end of the static end corrugated pipe 2 is connected with the static end conductive sealing cover 1 in a welding mode, an upper connecting flange is arranged on the upper rod part 62, the lower end of the static end corrugated pipe 2 is connected with the upper connecting flange in a welding mode, the lower mounting groove is located at the central position of the upper side surface of the static main contact 3, correspondingly, an upper mounting groove is arranged at the central position of the lower side surface of the static end conductive sealing cover 1, the two mounting grooves correspond to buckling devices, the static end corrugated pipe 2 is located in the two mounting grooves, an upper guide sleeve 16 extending along the vertical direction is fixedly arranged at the bottom of the upper mounting groove, the upper end of the upper rod part 62 is inserted into the upper guide sleeve 16 in a guiding. For the static end corrugated pipe 2, the static end corrugated pipe applies a reset elastic acting force to the static contact, so that the static arc contact 6 can descend until the upper connecting flange is in stop fit with the groove bottom of the lower mounting groove when the brake is switched off, and the static arc contact 6 protrudes downwards from the static main contact 3 to be arranged.

The movable contact structure comprises a movable main contact 9, a movable arc contact 7 and a movable conducting rod 13, wherein the movable main contact 9 is in a sleeve shape, the movable arc contact 7 is movably assembled in the movable main contact 9 along the up-down direction, actually, the movable main contact 9 and the static main contact 3 are used for normal through flow, the movable arc contact 7 and the static arc contact 6 are used for arc extinguishing, furthermore, the movable arcing contact 7 is arranged to protrude from the movable main contact 9 in the direction towards the structure of the fixed contacts, the fixed arcing contact 6 is arranged to protrude from the fixed main contact 3 in the direction towards the structure of the movable contacts, the movable arcing contact 7 is arranged to protrude from the movable main contact 9 in the direction towards the structure of the fixed contacts, when the vacuum arc extinguish chamber is switched on, the movable arc contact 7 and the static arc contact 6 are contacted with the movable main contact 9 and the static main contact 3 firstly, when the vacuum arc extinguish chamber is opened, the movable arc contact 7 and the static arc contact 6 are separated from the movable main contact 9 and the static main contact 3.

The upper end of the movable conducting rod 13 is welded with the lower end of the movable main contact 9, the lower end of the movable conducting rod 13 extends out of the arc extinguish chamber shell 15 to be in transmission connection with an insulating pull rod of a corresponding operating mechanism, a lower corrugated pipe 14 is sleeved outside the movable conducting rod 13, the upper end of the lower corrugated pipe 14 is welded with the movable conducting rod 13, and the lower end of the lower corrugated pipe is welded with the lower end of the arc extinguish chamber shell 15 to realize sealing protection.

The top of the movable main contact 9 is matched and inserted with the static main contact 3 correspondingly, the static main contact 3 is provided with a conical outer peripheral surface 31, the size of the conical outer peripheral surface 31 is gradually reduced from top to bottom in the radial direction, the movable main contact 9 is provided with an upward conical concave part 92, the conical concave part 92 is provided with a conical inner peripheral surface, and when the arc extinguish chamber is closed, the conical inner peripheral surface is matched and inserted with the conical outer peripheral surface 31 correspondingly so as to realize normal through flow.

Moreover, the tapered outer peripheral surface 31 and the tapered inner peripheral surface are both conical surfaces, and a good electric field effect is obtained.

The top end of the movable main contact 9 comprises a plurality of contact lobes 91, all the contact lobes 91 are uniformly distributed at intervals along the circumferential direction, all the contact lobes 91 are matched to form the conical concave part 92, and the inner side surfaces of all the contact lobes 91 are matched to form the conical inner peripheral surface. The design of the slotting and splitting can make the movable main contact 9 have certain elasticity, ensure the contact pressure and ensure the contact area. And the closing centering coaxiality of the movable contact and the fixed contact can be optimized.

In order to improve the effect of the peripheral electric field of the movable main contact 9, a contact shielding cover 8 is sleeved outside the movable main contact 9.

In this embodiment, the moving arcing contact 7 includes a lower head portion 71 and a lower rod portion 72, the lower head portion 71 is used for being in conductive contact with the upper head portion 61 of the stationary arcing contact 6, the lower rod portion 72 is assembled in the moving main contact 9 along the up-down direction in a sliding conductive manner, a guide groove and a contact finger installation groove are formed in the moving main contact 9, a moving end guide ring 11 is arranged in the guide groove, two contact finger installation grooves are arranged at intervals along the up-down direction, a moving end watch band contact finger 10 is fixedly assembled in each contact finger installation groove respectively, and the lower rod portion 72 is assembled with the moving end watch band contact finger 10 in a sliding conductive manner, so that the conductive connection between the moving arcing contact 7 and the moving main contact 9 is.

In practice, a lower assembly groove is provided at the center position of the upper end of the movable conducting rod 13, an upper assembly groove is provided at the center position of the lower end face of the movable main contact 9, the upper assembly groove and the lower assembly groove are buckled, the lower rod part 72 extends into the two assembly grooves, a lower guide sleeve 17 is provided at the lower assembly groove, the lower guide sleeve 17 extends along the up-down direction, the lower end of the lower rod part 72 is inserted into the lower guide sleeve 17 in a guiding manner, a movable end corrugated pipe 12 is sleeved outside the lower rod part 72 and the lower guide sleeve 17, the lower end of the movable end corrugated pipe 12 is welded and connected at the bottom of the lower assembly groove, and the upper end of the movable end corrugated pipe is welded and connected on a lower connecting flange provided on the lower rod part 72. The movable end corrugated pipe 12 applies a reset elastic acting force to the movable arcing contact 7 through the lower connecting flange to force the movable arcing contact 7 to move upwards, and after the brake is switched off, the movable arcing contact 7 moves upwards under the reset action of the movable end corrugated pipe 12 until the lower connecting flange is in stop fit with the bottom of the upper assembly groove.

As shown in fig. 2, during closing, the movable conducting rod 13 drives the movable main contact 9 to move upwards, the lower corrugated pipe 14 is stretched, meanwhile, the movable conducting rod 13 drives the movable arcing contact 7 to move upwards with the movable end corrugated pipe 12, the movable arcing contact 7 protrudes from the movable main contact 9 to be arranged, so that the movable arcing contact 7 and the static arcing contact 6 are in contact with the movable main contact 9 and the static main contact 3 first, and continue to move upwards along with the movable conducting rod 13 until the static main contact 3 and the movable main contact 9 are matched and inserted, and closing operation is completed. In the process of contacting the moving arc contact 7 and the static arc contact 6, the moving arc contact 7 and the static arc contact 6 retreat respectively, and the moving end corrugated pipe 12 and the static end corrugated pipe 2 are compressed and deformed respectively.

During opening, as shown in fig. 1, the movable conducting rod 13 drives the movable main contact 9 to move downwards, the lower corrugated pipe 14 is compressed, the movable main contact 9 and the static main contact 3 are separated firstly, at this time, under the action of the movable end corrugated pipe 12 and the static end corrugated pipe 2, the static arc contact 6 and the movable arc contact 7 are still in a contact state to realize contact arc striking, and the movable conducting rod 13 continues to move downwards until the movable arc contact 7 and the static arc contact 6 are separated to perform arc striking and arc extinguishing, so that opening operation is realized.

The specific embodiment 2 of the vacuum arc-extinguishing chamber provided by the invention is as follows:

the difference from example 1 is mainly that: in embodiment 1, in the embodiment, the stationary main contact has a tapered outer peripheral surface, and the movable main contact has a tapered recess. In the embodiment, the movable main contact is provided with the conical peripheral surface, the static main contact is provided with the conical concave part, the conical insertion of the two main contacts can be realized, and the contact area can be effectively increased.

In general, the movable contact structure is disposed below and the fixed contact structure is disposed above, but in other embodiments, the movable contact structure may be disposed above and the fixed contact structure may be disposed below.

The specific embodiment 3 of the vacuum arc-extinguishing chamber provided by the invention is as follows:

the difference from example 1 is mainly that: in embodiment 1, both the tapered outer peripheral surface of the stationary main contact and the tapered inner peripheral surface of the moving main contact are conical surfaces. In this embodiment, the conical outer circumferential surface of the stationary main contact and the conical inner circumferential surface of the moving main contact may be pyramidal surfaces, but for the purpose of improving the electric field performance, the edge of the stationary main contact may be designed to have a rounded corner structure.

The specific embodiment 4 of the vacuum arc-extinguishing chamber provided by the invention is as follows:

the difference from example 1 is mainly that: . In embodiment 1, the dynamic main contact comprises a plurality of contact lobes. In this embodiment, the movable main contact may also have an integral contact structure having a tapered recess for mating with the tapered outer peripheral surface of the stationary main contact.

The specific embodiment 5 of the vacuum arc-extinguishing chamber provided by the invention is as follows:

the difference from example 1 is mainly that: in embodiment 1, the moving arc contact is movably mounted in the moving main contact. In this embodiment, the moving arcing contact may also be directly fixed in the moving main contact, and the moving arcing contact and the moving main contact are relatively fixed in the vertical direction. For example, refer to the fixed assembly mode of the moving arc contact and the moving main contact in the vacuum arc-extinguishing chamber disclosed in the chinese invention patent application with application publication No. CN 111463061A.

The specific embodiment 6 of the vacuum interrupter provided by the present invention:

the difference from example 1 is mainly that: in embodiment 1, the rear ends of the static arcing contacts are encapsulated by a static end conductive cap. In this embodiment, the upper end of the stationary arcing contact may also extend outside the arc chamber housing.

For example, refer to the protruding manner of the stationary arc contact in the vacuum arc-extinguishing chamber disclosed in the chinese patent application with application publication No. CN 111463061A.

In the vacuum arc-extinguishing chamber provided by the embodiment, the main contact and the arc contact are completely separated in the switching-on and switching-off process, so that the through-flow capacity of the vacuum arc-extinguishing chamber is effectively improved, and the through-flow area can be effectively increased and the through-flow capacity can be improved by utilizing the conical insertion of the movable main contact and the static main contact. The movable end corrugated pipe and the static end corrugated pipe are utilized to enable the two arc contacts to simultaneously carry out relative motion in the switching-on and switching-off process, the two arc contacts are always dynamically kept at a larger relative distance, the arc current transfer in the arcing process is reduced, the main contact is prevented from being ablated, the service life of the contacts is prolonged, and therefore the service life of the vacuum arc extinguish chamber is obviously prolonged.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.