CN115206704A - Arc extinguish chamber and direct-current high-speed switch - Google Patents

Abstract

The invention relates to an arc extinguish chamber and a high-speed direct current switch. The arc extinguish chamber comprises a sleeve and a moving contact component. The moving contact component comprises a moving support, a pressure cylinder, a moving contact, a moving arc contact and a moving contact rod which is used for being connected with the driving mechanism, wherein the moving support is inserted in the accommodating cavity and is connected with one end of the sleeve pipe, which is provided with a first opening. The movable support is provided with an inner hole extending along the axial direction of the movable support, and the movable contact rod is movably inserted into the inner hole. The moving arc contact is arranged at one end of the moving contact rod far away from the driving mechanism and is coaxial with the moving contact rod. The moving contact is sleeved on the moving arc contact and is connected with the moving contact rod. The movable contact and the movable support are sleeved with the air cylinder, the air cylinder is fixedly connected with the movable contact and is in sliding connection with the movable support, and the air cylinder, the movable contact and the movable contact rod are enclosed to form an air flow space. The moving contact is provided with an airflow hole communicated with the airflow space, and one side of the automatic contact of the airflow hole, which is close to the moving support, extends to one side of the moving contact, which is far away from the moving support, in an inclined manner towards the direction close to the moving arc contact.

Description

Arc extinguish chamber and direct current high-speed switch

Technical Field

The invention relates to the technical field of power switches, in particular to an arc extinguish chamber and a direct current high-speed switch.

Background

With the intensive research and construction of new power systems, dc systems will transition from the traditional "end-to-end" form to the "multi-end" form, finally forming a "dc grid". The multi-terminal direct current and direct current power grid has stronger power transmission capability and more flexible operation mode, can effectively solve the problems of multi-power supply and multi-drop point power transmission, and becomes one of effective technical means for solving the shortage of Chinese power transmission corridors and large-scale renewable energy grid connection.

The High-Speed direct current Switch (HSS) is a key device of a multi-terminal direct current even direct current power grid, is used for the online switching of a third station at a load end and the quick isolation function of direct current line faults, and plays a vital role in supporting the flexible and reliable operation of a direct current system. The arc extinguish chamber is one of the core components of the direct current high-speed switch, and can quickly extinguish arc and restrain current after a medium-high voltage circuit is cut off a power supply through excellent insulating property of vacuum in a tube, so that accidents and accidents are avoided. However, the ability of a common arc chute to cut off a small direct current is weak.

Disclosure of Invention

Accordingly, there is a need for an arc extinguish chamber and a dc high-speed switch, which can improve the capability of breaking a small dc current.

An arc chute, comprising:

the sleeve is provided with an accommodating cavity and a first opening communicated with the accommodating cavity;

the moving contact component comprises a moving support, a pressure cylinder, a moving contact, a moving arc contact and a moving contact rod which is used for being connected with a driving mechanism, and the moving support is inserted in the accommodating cavity and is connected with one end of the sleeve pipe, which is provided with the first opening; the movable support is provided with an inner hole, the inner hole extends along the axial direction of the movable support, and the movable contact rod is movably inserted into the inner hole; the moving arc contact is arranged at one end, far away from the driving mechanism, of the moving contact rod and is coaxially arranged with the moving contact rod, and the moving contact is sleeved on the moving arc contact and is connected with the moving contact rod; the pneumatic cylinder cover is located the moving contact with the dynamic support, the pneumatic cylinder respectively with moving contact fixed connection, and with dynamic support sliding connection, the pneumatic cylinder, the moving contact with the surrounding of moving contact pole establishes and forms the air current space, the moving contact be equipped with the airflow hole of air current space intercommunication, the airflow hole certainly the moving contact is close to one side of dynamic support is towards being close to the direction slope of moving arc contact extends to the moving contact is kept away from one side of dynamic support.

In one embodiment, an included angle between an axis of the airflow hole and an axis of the movable contact is 25-45 degrees.

In one embodiment, the airflow hole is a kidney-shaped hole, and the kidney-shaped hole extends along the circumferential direction of the movable contact; the movable contact is provided with two air flow holes, the two air flow holes are waist-shaped holes, and the two air flow holes are arranged at intervals along the circumferential direction of the movable contact and are symmetrically arranged relative to a plane passing through the central axis of the movable contact.

In one embodiment, the moving contact assembly further comprises a nozzle, the nozzle is mounted on one side of the moving contact far away from the moving support and connected, the airflow hole is located inside the nozzle, and one end, far away from the moving contact rod, of the moving arc contact is inserted into the nozzle.

In one embodiment, the nozzle includes a first nozzle section, a second nozzle section, a third nozzle section and a fourth nozzle section which are connected in sequence, the first nozzle section extends from the movable contact in the axial direction of the moving arc contact towards the direction far away from the movable contact, the second nozzle section inclines from the side of the first nozzle section far away from the movable contact towards the axial direction close to the moving arc contact, the third nozzle section extends from the side of the second nozzle section far away from the first nozzle section along the axial direction of the moving arc contact, and the fourth nozzle section inclines from the side of the third nozzle section far away from the second nozzle section towards the axial direction far away from the moving arc contact; one end of the moving arc contact, which is far away from the moving contact rod, is inserted into the first nozzle section, and an airflow channel communicated with the airflow hole is formed between the moving arc contact and the first nozzle section at intervals.

In one embodiment, the diameter of the third nozzle section is 30-40 mm, and the included angle between the fourth nozzle section and the axis of the moving arc contact is 5-10 degrees.

In one embodiment, the outer peripheral surface of the movable support is annularly provided with a guide groove, the movable contact assembly further comprises a guide ring, the guide ring is arranged in the guide groove, and the air cylinder is in guide fit with the movable support through the guide ring; the moving contact component further comprises a first elastic ring, the first elastic ring is arranged in the guide groove, and the guide ring is arranged outside the first elastic ring.

In one embodiment, a sealing groove is annularly formed in the peripheral surface of the movable support, the movable contact assembly further comprises a sealing ring, the sealing ring is arranged in the sealing groove, and the air cylinder is in sealing fit with the movable support through the sealing ring.

In one embodiment, the sleeve is provided with a second opening opposite to the first opening; the arc extinguish chamber further comprises a static contact component, the static contact component comprises a static support, a static arc contact and a static contact, and the static support is inserted into the accommodating cavity and is connected with one end, provided with the second opening, of the sleeve; the static arc contact and the static contact are both arranged on one side, facing the movable contact component, of the static support, the static arc contact and the movable arc contact are coaxially arranged, and the static contact is arranged outside the static arc contact in an enclosing mode.

In one embodiment, the fixed contact includes a second elastic ring and a plurality of fixed contact bodies, the plurality of fixed contact bodies are arranged along the circumferential direction of the fixed support, a through hole is formed at one end of each of the plurality of fixed contact bodies close to the fixed support, the second elastic ring penetrates through the through hole of each fixed contact body, and the plurality of fixed contact bodies are arranged on the outer circumferential surface of one side of the fixed support facing the movable contact assembly through the second elastic hoop.

In one embodiment, the fixed contact assembly further includes a shielding cover, the shielding cover and the fixed support are coaxially arranged and connected with the fixed support, and the shielding cover is covered on the fixed contact.

In one embodiment, the fixed contact assembly further includes a plurality of elastic members, the elastic members are disposed between the fixed contact and the shielding case, the plurality of elastic members and the plurality of fixed contact bodies are disposed in a one-to-one correspondence, one end of each elastic member abuts against the outer circumferential surface of the corresponding fixed contact body, and the other end of each elastic member abuts against the inner circumferential surface of the shielding case.

In one embodiment, a first step portion and a second step portion are arranged on an outer peripheral surface of one side, facing the movable contact assembly, of the static support, the first step portion is closer to the outer peripheral surface of the static support relative to the second step portion, one end of the shielding cover is installed on the first step portion, one end, far away from the static support, of the shielding cover is provided with an installation groove, one end of the static contact is installed on the second step portion, and the other end of the static contact is inserted into the installation groove.

A DC high-speed switch comprises an insulating support, a driving mechanism and an arc extinguish chamber, wherein the driving mechanism is arranged on the insulating support, and the driving mechanism is connected with a movable contact rod.

When the arc extinguish chamber and the direct current high-speed switch are switched on, the movable contact rod drives the air cylinder, the movable contact and the movable arc contact to move towards the direction far away from the first opening under the action of the driving mechanism. In the process of closing movement, the movable arc contact generates electric arcs, meanwhile, the airflow space formed by the air cylinder, the movable contact and the movable contact rod is enlarged and forms negative pressure, and arc ions generated by the movable arc contact are sucked into the airflow space of the air cylinder from the airflow hole so as to rapidly reduce the temperature of the electric arcs and avoid burning parts by the electric arcs generated in closing movement. When the brake is switched off, the movable contact rod drives the air cylinder, the movable contact and the movable arc contact to move towards the direction close to the first opening under the action of the driving mechanism. In the process of opening movement, an airflow space formed by the air cylinder, the moving contact and the moving contact rod is compressed and generates high-pressure SF6 gas, and the high-pressure gas in the air cylinder is exhausted through an airflow hole of the moving contact to dissociate ions generated in the opening and closing process, so that electric arcs are extinguished. Through set up the air current hole at the moving contact, the automatic contact of air current hole inclines to extend to the moving contact and keeps away from the one side of moving support towards the direction that is close to moving arc contact near one side of moving support, and at the in-process of separating brake like this, the high-pressure gas in the air current space that air cylinder, moving contact and moving contact pole formed can smoothly blow to electric arc, improves the little direct current ability of breaking.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a dc high-speed switch according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of an arc chute of the dc high speed switch shown in fig. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of a portion B of FIG. 2;

FIG. 5 is a cross-sectional view of the moving contact assembly of the DC high speed switch shown in FIG. 2;

fig. 6 is a schematic structural diagram of a movable contact of the dc high-speed switch shown in fig. 2;

fig. 7 is a sectional view of the movable contact assembly of the dc high speed switch shown in fig. 6.

The reference numbers illustrate: 10. an arc extinguishing chamber; 11. a sleeve; 111. an accommodating cavity; 12. a moving contact assembly; 121. a movable support; 1211. a guide groove; 1212. a guide ring; 1213. a first elastic ring; 1214. a sealing groove; 122. a pneumatic cylinder; 123. a moving contact; 1231. an airflow aperture; 124. a moving arc contact; 125. a movable contact rod; 126. an air flow space; 127. a spout; 1271. a first nozzle section; 1272. a second nozzle section; 1273. a third nozzle section; 1274. a fourth nozzle section; 13. a stationary contact assembly; 131. a static support; 1311. a first step portion; 1312. a second stepped portion; 132. a stationary arc contact; 133. static contact; 1331. a static contact body; 1332. perforating; 134. a shield case; 1341. mounting grooves; 135. an elastic member; 20. a drive mechanism; 30. and an insulating support.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 2, 3 and 7, an arc extinguish chamber 10 according to an embodiment of the present invention includes a sleeve 11 and a movable contact assembly 12. The sleeve 11 has a receiving cavity 111 and a first opening, and the first opening is communicated with the receiving cavity 111. The movable contact assembly 12 includes a movable support 121, a pneumatic cylinder 122, a movable contact 123, a movable arcing contact 124 and a movable contact rod 125 for connecting with the driving mechanism 20, wherein the movable support 121 is inserted into the receiving cavity 111 and connected to one end of the sleeve 11 having the first opening. The movable support 121 is provided with an inner hole extending along the axial direction of the movable support 121, and the movable contact rod 125 is movably inserted into the inner hole. The moving arc contact 124 is mounted to an end of the moving contact rod 125 remote from the actuating mechanism 20 and is disposed coaxially with the moving contact rod 125. The moving contact 123 is sleeved on the moving arcing contact 124 and connected with the moving contact rod 125. The pneumatic cylinder 122 is sleeved on the movable contact 123 and the movable support 121, the pneumatic cylinder 122 is respectively fixedly connected with the movable contact 123 and slidably connected with the movable support 121, and an airflow space 126 is defined by the pneumatic cylinder 122, the movable contact 123 and the movable contact rod 125. The movable contact 123 is provided with an airflow hole 1231 communicated with the airflow space 126, and the airflow hole 1231 extends from one side of the movable contact 123 close to the movable support 121 to one side of the movable contact 123 far away from the movable support 121 in an inclined manner in a direction close to the movable arc contact 124.

In the arc extinguish chamber, when the door is closed, the movable contact rod 125 drives the puffer cylinder 122, the movable contact 123 and the movable arc contact 124 to move away from the first opening under the action of the driving mechanism 20. In the process of closing movement, the moving arc contact 124 generates an arc, and meanwhile, the airflow space 126 formed by the puffer cylinder 122, the moving contact 123 and the moving contact rod 125 is expanded and forms negative pressure, so that arc ions generated by the moving arc contact 124 are sucked into the airflow space 126 of the puffer cylinder 122 from the airflow hole 1231 to rapidly reduce the temperature of the arc, and the parts are prevented from being burnt by the arc generated in closing. During opening, the movable contact rod 125 drives the air cylinder 122, the movable contact 123 and the movable arcing contact 124 to move toward the first opening under the action of the driving mechanism 20. During the opening movement, the air flow space 126 formed by the air cylinder 122, the movable contact 123 and the movable contact rod 125 is compressed and generates high-pressure SF6 gas, and the high-pressure gas in the air cylinder 122 is exhausted through the air flow hole 1231 of the movable contact 123 to dissociate ions generated during the opening and closing process, thereby extinguishing the electric arc. Through setting up air flow hole 1231 at moving contact 123, air flow hole 1231 is from moving one side of contact 123 towards the slope that is close to moving arc contact 124 and extend to moving contact 123 and keep away from moving one side of support 121, like this at the in-process of separating brake, the high-pressure gas in the air current space 126 that air cylinder 122, moving contact 123 and moving contact pole 125 formed can smoothly blow to the electric arc through air flow hole 1231, is favorable to improving and opens and cut off little direct current ability.

In one embodiment, referring to fig. 7, the angle between the axis of the airflow holes 1231 and the axis of the movable contact 123 is θ, and θ is greater than or equal to 25 ° and less than or equal to 45 °. In this way, in the process of opening the brake, the high-pressure gas in the airflow space 126 formed by the puffer cylinder 122, the movable contact 123 and the movable contact rod 125 can be smoothly blown to the arc through the airflow hole 1231, which is beneficial to improving the capability of switching on and off the small direct current.

Optionally, θ is 25 °, 30 °, or 45 °. Specifically, in this embodiment, an included angle between an axis of the airflow hole 1231 and an axis of the movable contact 123 is 30 °, and in the process of opening the brake, high-pressure gas in the airflow space 126 formed by the puffer cylinder 122, the movable contact 123 and the movable contact rod 125 can be smoothly blown to the arc through the airflow hole 1231, which is beneficial to improving the capability of switching on and off a small direct current.

In one embodiment, referring to fig. 6, the airflow holes 1231 are kidney-shaped holes extending along the circumferential direction of the movable contacts 123. In this way, the airflow passing through the airflow holes 1231 can be increased, so that more high-pressure gas in the airflow space 126 blows towards the arc in the opening process, and the capability of breaking a small direct current is improved.

Alternatively, referring to fig. 6, two air flow holes 1231 are provided, and both air flow holes 1231 are kidney-shaped holes. The two airflow holes 1231 are spaced along the circumference of the movable contact 123 and are symmetrically arranged with respect to the plane passing through the central axis of the movable contact 123And (4) placing. Wherein, the distance H between the two airflow holes 1231 along the circumference of the movable contact 123 is 25mm, and the middle diameter of the waist-shaped hole

Is 128mm, and the radius of the semicircular arcs at the two ends of the waist-shaped hole is 11mm.

In one embodiment, referring to fig. 2 and 3, movable contact assembly 12 further includes a spout 127. The nozzle 127 is installed on one side of the movable contact 123 far away from the movable support 121, and the air flow hole 1231 is located in the nozzle 127. The end of the moving arcing contact 124 remote from the moving contact rod 125 is inserted into the spout 127. Further, the spout 127 is in sealing engagement with the movable contact 123. Optionally, a sealant is disposed between the spout 127 and the movable contact 123, and the spout 127 and the movable contact 123 are sealed by the sealant. Therefore, the high-pressure gas can be prevented from overflowing from the driven contact 123 and the nozzle 127, and the high-pressure gas can completely flow out through the nozzle 127, so that the electric arc can be better extinguished.

Further, referring to fig. 2 and 5, the outlet 127 includes a first outlet section 1271, a second outlet section 1272, a third outlet section 1273 and a fourth outlet section 1274 which are connected in sequence. The first nozzle section 1271 extends from the contact 123 in a direction away from the movable contact 123 in the axial direction of the movable arc contact 124, the second nozzle section 1272 is inclined in the axial direction close to the movable arc contact 124 from the side of the first nozzle section 1271 away from the movable contact 123, the third nozzle section 1273 extends in the axial direction of the movable arc contact 124 from the side of the second nozzle section 1272 away from the first nozzle section 1271, and the fourth nozzle section 1274 is inclined in the axial direction away from the movable arc contact 124 from the side of the third nozzle section 1273 away from the second nozzle section 1272. One end of the moving arc contact 124, which is far away from the moving contact rod 125, is inserted into the first outlet port section 1271, and is spaced apart from the first outlet port section 1271 to form an air flow channel communicated with the air flow hole 1231. Since the first nozzle hole section 1271 extends in the axial direction of the moving arc contact 124, it is possible to prevent the nozzle hole 127 and other components from interfering with the mounting. Since the second outlet section 1272 is inclined from the side of the first outlet section 1271 away from the movable contact 123 toward the axial direction close to the movable arc contact 124, the second outlet section 1272 can guide the high-pressure gas to blow toward the third outlet section 1273, so that the high-pressure gas extinguishes the arc. Because the fourth nozzle section 1274 is inclined from the side of the third nozzle section 1273 far away from the second nozzle section 1272 to the axial direction far away from the moving arc contact 124, that is, the diameter of the fourth nozzle section 1274 is gradually increased from the third nozzle section 1273 to the direction far away from the third nozzle section 1273, the control of the flow speed of the high-pressure gas is realized, and the on-off performance of the arc extinguish chamber 10 is ensured.

Furthermore, the diameter of the third nozzle section 1273 is 30 mm-40 mm, and the included angle between the fourth nozzle section 1274 and the axis of the moving arc contact 124 is 5-10 degrees. Therefore, the gas blowing is stronger and the arcing time is shorter while the gas fluidity is not influenced, and the optimal configuration of the high-pressure gas pressure and the gas blowing quantity of the nozzle 127 at the beginning of the process of low direct current is realized.

Optionally, the diameter of the third nozzle section 1273 is 38mm, and the angle between the fourth nozzle section 1274 and the axis of the moving arc contact 124 is 7.5 °.

In one embodiment, referring to fig. 2 and 3, the outer peripheral surface of the movable support 121 is annularly provided with a guide groove 1211, the movable contact assembly 12 further includes a guide ring 1212, the guide ring 1212 is disposed in the guide groove 1211, and the air cylinder 122 is guided and engaged with the movable support 121 through the guide ring 1212. In this way, the guide ring 1212 can constrain the axial movement of the air cylinder 122 along the movable support 121, so that the movement of the air cylinder 122 has guidance, and the stability of the movement of the air cylinder 122 is improved.

Further, referring to fig. 3, the movable contact assembly 12 further includes a first elastic ring 1213, the first elastic ring 1213 is disposed in the guide slot 1211, and the guide ring 1212 is disposed outside the first elastic ring 1213. In this way, the first elastic ring 1213 has a certain elasticity, so that the guide ring 1212 can be ensured to have a guiding function, and the jamming of the air cylinder 122 during the movement can be avoided.

In one embodiment, referring to fig. 3, the outer circumferential surface of the movable support 121 is further provided with a sealing groove 1214. The movable contact assembly 12 further includes a sealing ring disposed in the sealing groove 1214, and the air cylinder 122 is in sealing engagement with the movable support 121 through the sealing ring. So, the air cylinder 122 passes through the sealing washer and moves the sealed cooperation of support 121, can improve the leakproofness of air cylinder 122 like this, prevents that high-pressure gas from the position between air cylinder 122 and the support 121 excessive to obtain the gas of higher pressure, be favorable to extinguishing electric arc fast.

Optionally, the sealing ring is coated with grease. In this way, the frictional force between the packing and the air cylinder 122 can be reduced, and the air cylinder 122 can move smoothly.

In one embodiment, referring to FIG. 2, the sleeve 11 is provided with a second opening disposed opposite the first opening. The arc extinguish chamber 10 further comprises a static contact assembly 13, the static contact assembly 13 comprises a static support 131, a static arc contact 132 and a static contact 133, and the static support 131 is inserted into the accommodating cavity 111 and connected with one end of the sleeve 11 provided with the second opening. The static arcing contact 132 and the static contact 133 are both installed on one side of the static support 131 facing the movable contact assembly 12, the static arcing contact 132 and the movable arcing contact 124 are coaxially arranged, and the static contact 133 is enclosed outside the static arcing contact 132. During closing, the movable contact rod 125 drives the air cylinder 122, the movable contact 123 and the movable arc contact 124 to move towards the direction of the static contact component 13 under the action of the driving mechanism 20, in the process of closing movement, the movable arc contact 124 and the static arc contact 132 generate electric arcs, meanwhile, an airflow space 126 formed by the air cylinder 122, the movable contact 123 and the movable contact rod 125 is expanded and forms negative pressure, arc ions generated by the movable arc contact 124 and the static arc contact 132 are sucked into the air cylinder 122 from the airflow hole 1231, the temperature of the electric arcs is rapidly reduced, and parts are prevented from being burnt by the electric arcs generated during closing. During opening, the moving contact rod 125 drives the air cylinder 122, the moving contact 123 and the moving arc contact 124 to move in a direction away from the fixed contact assembly 13 under the action of the driving mechanism 20, and during opening, an air flow space 126 formed by the air cylinder 122, the moving contact 123 and the moving contact rod 125 is compressed and generates high-compression SF6 gas. The puffer cylinder 122 continues to move, and when the stationary arc contact 132 and the nozzle 127 are separated, the high-pressure gas in the gas flow space 126 is exhausted through the gas flow holes 1231 and the nozzle 127 to dissociate ions generated during the breaking process, thereby extinguishing the arc.

Further, referring to fig. 2 and 4, the fixed contact 133 includes a second elastic ring and a plurality of fixed contact bodies 1331, and the plurality of fixed contact bodies 1331 are arranged along the circumferential direction of the fixed support 131. Through holes 1332 are formed in one ends of the plurality of static contact bodies 1331 close to the static support 131, a second elastic ring penetrates through the through hole 1332 of each static contact body 1331, and the plurality of static contact bodies 1331 are arranged on the outer peripheral surface of one side of the static support 131 facing the movable contact assembly 12 through a second elastic hoop. Optionally, the second elastic ring is an elastic wire ring. Therefore, the plurality of static contact bodies 1331 are connected in series by the second elastic ring, so that the static contact bodies 1331 are prevented from scattering caused by improper force application of operators in the installation process, and the production efficiency is improved. In addition, the second elastic ring can also provide a contact force between the plurality of static contact bodies 1331 and the static support 131.

In one embodiment, referring to fig. 2 and 4, the stationary contact assembly 13 further includes a shielding can 134, and the shielding can 134 and the stationary support 131 are coaxially disposed and connected to the stationary support 131. The shielding can 134 covers the stationary contact 133. Thus, the phenomenon of point discharge of the stationary contact 133 is avoided.

Further, referring to fig. 2 and 4, the stationary contact assembly 13 further includes an elastic element 135, and the elastic element 135 is disposed between the stationary contact 133 and the shielding can 134. The elastic members 135 are provided in plural, and the plural elastic members 135 and the plural static contact bodies 1331 are provided in one-to-one correspondence. One end of the elastic element 135 abuts against the outer peripheral surface of the static contact body 1331, and the other end abuts against the inner peripheral surface of the shield can 134. With this arrangement, the elastic element 135 can provide a pressing force, so that the static contact body 1331 is pressed against the outer peripheral surface of the static support 131 facing the side of the movable contact assembly 12. In addition, the static contact bodies 1331 are uniformly distributed, so that the problems of pressing force offset and reduction of through-flow capacity caused by mutual extrusion of the static contact bodies 1331 due to uneven density are solved, and the reliability of the product is improved.

Optionally, the elastic member 135 is a plate spring. The outer peripheral surface of the static contact body 1331 is provided with a first groove, and the inner peripheral surface of the shielding case 134 is correspondingly provided with a second groove. One end of the plate spring leaf is inserted into the first groove, and the other end of the plate spring leaf is inserted into the second groove.

Further, referring to fig. 4, the outer peripheral surface of the stationary support 131 facing the movable contact assembly 12 is provided with a first step 1311 and a second step 1312, and the first step 1311 is closer to the outer peripheral surface of the stationary support 131 than the second step 1312. One end of the shield 134 is mounted to the first step 1311, and one end of the shield 134, which is far away from the static support 131, is provided with a mounting groove 1341. One end of the static contact 133 is mounted on the second stepped portion 1312, and the other end is inserted into the mounting groove 1341. In this way, one ends of the shield can 134 and the fixed contact 133 are respectively mounted on the first stepped portion 1311 and the second stepped portion 1312, so that an interval for disposing the elastic member 135 is formed between the fixed contact 133 and the shield can 134. One end of the shielding cover 134 is mounted on the second step portion 1312, and the other end is inserted into the mounting groove 1341 of the shielding cover 134, so that the static contact 133 abuts against the groove walls of the second step portion 1312 and the mounting groove 1341 under the action of the elastic member 135, and the mounting reliability of the static contact 133 is realized.

Referring to fig. 1, a dc high-speed switch according to an embodiment of the present invention includes an insulating support 30, a driving mechanism 20, and an arc extinguish chamber 10 according to any of the embodiments. The driving mechanism 20 is mounted on the insulating support 30, and the driving mechanism 20 is connected to the movable contact rod 125. The advantages of the dc high-speed switch can be referred to the advantages of the arc-extinguishing chamber 10, and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (14)

1. An arc chute, comprising:

the sleeve is provided with an accommodating cavity and a first opening communicated with the accommodating cavity; and

the moving contact component comprises a moving support, a pressure cylinder, a moving contact, a moving arc contact and a moving contact rod which is used for being connected with a driving mechanism, and the moving support is inserted in the accommodating cavity and is connected with one end of the sleeve pipe, which is provided with the first opening; the movable support is provided with an inner hole, the inner hole extends along the axial direction of the movable support, and the movable contact rod is movably inserted into the inner hole; the moving arc contact is arranged at one end, far away from the driving mechanism, of the moving contact rod and is coaxially arranged with the moving contact rod, and the moving contact is sleeved on the moving arc contact and is connected with the moving contact rod; the pneumatic cylinder cover is located the moving contact with the dynamic support, the pneumatic cylinder respectively with moving contact fixed connection, and with dynamic support sliding connection, the pneumatic cylinder, the moving contact with the surrounding of moving contact pole establishes and forms the air current space, the moving contact be equipped with the airflow hole of air current space intercommunication, the airflow hole certainly the moving contact is close to one side of dynamic support is towards being close to the direction slope of moving arc contact extends to the moving contact is kept away from one side of dynamic support.

2. The arc chute according to claim 1, wherein an angle between an axis of said gas flow hole and an axis of said movable contact is 25 ° to 45 °.

3. The arc extinguish chamber according to claim 1, wherein the airflow hole is a kidney-shaped hole which extends along the circumferential direction of the movable contact;

the two air flow holes are waist-shaped holes and are arranged at intervals along the circumferential direction of the moving contact and symmetrically arranged relative to a plane passing through the central axis of the moving contact.

4. The arc extinguish chamber according to claim 1, wherein the moving contact assembly further comprises a nozzle, the nozzle is installed on one side of the moving contact, which is far away from the moving support, the airflow hole is located inside the nozzle, and one end, which is far away from the moving contact rod, of the moving arc contact is inserted into the nozzle.

5. The arc extinguish chamber according to claim 4, wherein the nozzle comprises a first nozzle section, a second nozzle section, a third nozzle section and a fourth nozzle section which are connected in sequence, the first nozzle section extends from the movable contact in the axial direction of the moving arc contact and in the direction away from the movable contact, the second nozzle section inclines from the side, away from the movable contact, of the first nozzle section in the axial direction of the moving arc contact and in the axial direction of the moving arc contact, the third nozzle section extends from the side, away from the first nozzle section, of the second nozzle section in the axial direction of the moving arc contact and in the axial direction of the moving arc contact, and the fourth nozzle section inclines from the side, away from the second nozzle section, of the third nozzle section in the axial direction of the moving arc contact and in the axial direction of the moving arc contact; one end of the moving arc contact, which is far away from the moving contact rod, is inserted into the first nozzle section, and an airflow channel communicated with the airflow hole is formed between the moving arc contact and the first nozzle section at intervals.

6. The arc extinguish chamber according to claim 5, wherein the diameter of the third nozzle section is 30-40 mm, and the included angle between the fourth nozzle section and the axis of the moving arc contact is 5-10 degrees.

7. The arc extinguish chamber according to claim 1, wherein a guide groove is annularly formed on the outer peripheral surface of the movable support, the movable contact assembly further comprises a guide ring which is arranged in the guide groove, and the air cylinder is in guide fit with the movable support through the guide ring;

the moving contact component further comprises a first elastic ring, the first elastic ring is arranged in the guide groove, and the guide ring is arranged outside the first elastic ring.

8. The arc extinguish chamber according to claim 1, wherein a seal groove is annularly formed on the outer peripheral surface of the movable support, the movable contact assembly further comprises a seal ring which is arranged in the seal groove, and the air cylinder is in seal fit with the movable support through the seal ring.

9. An arc chamber according to any one of claims 1 to 8, characterized in that said bushing is provided with a second opening opposite said first opening;

the arc extinguish chamber further comprises a static contact component, the static contact component comprises a static support, a static arc contact and a static contact, and the static support is inserted into the accommodating cavity and is connected with one end, provided with the second opening, of the sleeve; the static arc contact and the static contact are both arranged on one side, facing the movable contact component, of the static support, the static arc contact and the movable arc contact are coaxially arranged, and the static contact is arranged outside the static arc contact in an enclosing mode.

10. The arc extinguish chamber according to claim 9, wherein the fixed contact includes a second elastic ring and a plurality of fixed contact bodies, the plurality of fixed contact bodies are arranged along a circumferential direction of the fixed support, a through hole is formed at one end of each of the plurality of fixed contact bodies, which is close to the fixed support, the second elastic ring penetrates through the through hole of each of the fixed contact bodies, and the plurality of fixed contact bodies are arranged on an outer circumferential surface of the fixed support, which faces one side of the movable contact assembly, through the second elastic hoop.

11. The arc extinguish chamber according to claim 10, wherein the stationary contact assembly further comprises a shielding cover, the shielding cover is coaxially arranged with the stationary support and connected with the stationary support, and the shielding cover is arranged on the stationary contact.

12. The arc extinguish chamber according to claim 11, wherein the fixed contact assembly further comprises a plurality of elastic members, the elastic members are disposed between the fixed contact and the shielding case, the plurality of elastic members are disposed in one-to-one correspondence with the plurality of fixed contact bodies, one end of each elastic member abuts against an outer peripheral surface of the corresponding fixed contact body, and the other end of each elastic member abuts against an inner peripheral surface of the shielding case.

13. The arc extinguish chamber according to claim 12, wherein a first step portion and a second step portion are provided on an outer peripheral surface of the stationary support on a side of the stationary support facing the movable contact assembly, the first step portion is closer to the outer peripheral surface of the stationary support than the second step portion, one end of the shielding cover is mounted on the first step portion, an installation groove is provided on an end of the shielding cover away from the stationary support, one end of the stationary contact is mounted on the second step portion, and the other end of the stationary contact is inserted into the installation groove.

14. A dc high-speed switch comprising an insulating post, a drive mechanism mounted to said insulating post, and an arc chute according to any one of claims 1 to 13, said drive mechanism being connected to said moving contact rod.

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