A contact mechanism

Abstract

A contact mechanism includes a moving contact and a static contact seat that cooperate with each other. A receiving cavity is provided in the static contact seat, and a conductive contact finger and a first contact assembly are assembled in the receiving cavity. The first contact assembly includes a first contact electrically connected to the receiving cavity. In the conducting state, the moving contact extends into the receiving cavity, and a mating hole provided at the end of the moving contact is inserted and mated with the leading end of the first contact. At the same time, the outer side of the moving contact is inserted and mated with the conductive contact finger. A baffle assembly that performs telescopic movement in the receiving cavity is also assembled between the first contact assembly and the conductive contact finger. During the opening and closing process, when an arc is generated between the moving contact and the first contact, the baffle assembly is located between the leading end of the first contact and the conductive contact finger to block the arc. In the present invention, during opening and closing, the baffle assembly blocks and extinguishes the arc between the moving contact and the first contact, avoiding damage to the conductive contact finger caused by the arc.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and particularly to a contact mechanism. Background Art

[0002] Gas-insulated switchgear (GIS) consists of a circuit breaker, disconnecting switch, earthing switch, current transformer, lightning arrester, busbar, connecting piece, outgoing terminal, etc. All these devices or components are enclosed in a metal earthed enclosure. GIS has the advantages of low failure rate, high operation reliability, less maintenance work, and long overhaul period. However, when GIS is applied at voltages of 126 kV and above, when the disconnecting switch opens and closes the bus transfer current, an arc will be generated between the moving contact and the static contact. The arc will cause damage to the contact and finger, and the decomposition products generated will also contaminate the insulating parts inside the switch, leading to insulation failure and / or reduction of insulation performance of the switch.

[0003] Currently, to solve the above problems, usually the opening and closing speed of the disconnecting switch is appropriately increased, and at the same time, an arc-igniting structure of alloy material (the alloy material plays a role in resisting arc ablation) is designed at the ends of the moving contact and the static contact. However, in actual application, when the disconnecting switch is in the opening and closing process, components such as contacts and fingers will still be damaged by the arc, posing a hidden danger to the reliable operation of the power grid. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a contact mechanism with a relatively fast opening and closing speed and less affected by the arc.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A contact mechanism includes a moving contact and a static contact seat that cooperate with each other. A receiving cavity is provided in the static contact seat, and a conductive finger and a first contact assembly are assembled in the receiving cavity. The first contact assembly includes a first contact electrically connected to the receiving cavity. When in the conducting state, the moving contact extends into the receiving cavity, the mating hole provided at the end of the moving contact is inserted and mated with the head end of the first contact, and at the same time, the outside of the moving contact is inserted and mated with the conductive finger.

[0007] A baffle assembly that can perform telescopic movement in the receiving cavity is further assembled between the first contact assembly and the conductive finger. During the opening and closing process, when an arc is generated between the moving contact and the first contact, the baffle assembly is located between the head end of the first contact and the conductive finger to block the arc.

[0008] Preferably, during the closing process, when an arc is generated between the moving contact and the head end of the first contact, the baffle assembly is located between the head end of the first contact and the conductive finger. Subsequently, the baffle assembly contracts under the pressing of the moving contact, the arc is extinguished when the first contact is inserted into the mating hole, and finally the moving contact is inserted and mated with the conductive finger to complete the closing.

[0009] During the opening process, the moving contact first separates from the conductive finger to cut off the power, and then the moving contact separates from the head end of the first contact and generates an arc. The baffle assembly resets, so that the baffle assembly is located between the head end of the first contact and the conductive finger.

[0010] Preferably, the first contact assembly further includes an elastic energy storage member. When the moving contact performs an opening movement, the head end of the first contact is pulled out of the accommodation cavity by a certain distance, and the elastic energy storage member stores energy. When the head end of the first contact separates from the moving contact, the elastic energy storage member releases energy to quickly retract the head end of the first contact into the accommodation cavity.

[0011] Preferably, the head end of the baffle assembly is flush with the head end of the first contact at the opening of the accommodation cavity.

[0012] Preferably, the outer end of the mating hole is a friction end. During opening, the head end of the first contact cooperates with the friction end to pull the first contact to move with the moving contact, so as to store energy in the elastic energy storage member; the inner end of the mating hole is an isolation end. During closing, after the head end of the first contact overcomes the friction force with the friction end, it extends into the isolation end, and there is no electrical connection between the isolation end and the first contact.

[0013] Preferably, the mating hole is a stepped hole with a thick inner end and a thin outer end. The thicker end is the isolation end, the inner diameter of the isolation end is larger than the outer diameter of the head end of the first contact, and the inner diameter of the friction end is smaller than the outer diameter of the elastic head end of the first contact.

[0014] Preferably, an elastic limiting structure is provided between the head end of the baffle assembly and the head end of the first contact, and the elastic limiting structure makes the head end of the baffle assembly flush with the head end of the first contact.

[0015] Preferably, a ring-shaped boss structure protrudes radially from the outer side wall of the head end of the first contact. The ring-shaped boss structure serves as an elastic limiting portion. The head end of the baffle assembly is flush with the head end of the quick contact by cooperating with the elastic limiting portion, and the first contact and the moving contact move along the same straight line.

[0016] Preferably, the elastic energy storage member includes a contact piece, an insulating guide plate, and a contact spring. The contact piece is fixedly arranged at the tail end of the first contact and is electrically connected to the accommodation cavity. The insulating guide plate is sleeved on the middle part of the first contact and is in insulating cooperation with the accommodation cavity. The contact spring is sleeved on the first contact between the contact piece and the insulating guide plate. The contact piece is in sliding cooperation with the accommodation cavity, and the insulating guide plate is fixedly connected to the accommodation cavity.

[0017] Preferably, the baffle assembly includes an annular baffle and an elastic member. The central hole of the annular baffle allows the first contact to pass through. The elastic member is sleeved on the middle part of the first contact. One end of the elastic member is insulatedly connected to the annular baffle, and the other end of the elastic member is connected to the receiving cavity.

[0018] Preferably, a boss serving as an elastic engaging portion is provided at one end of the central hole of the annular baffle close to the elastic member. The elastic engaging portion protrudes annularly along the central hole. The annular baffle is engaged with the head end of the first contact through the elastic engaging portion, so that the annular baffle is flush with the head end of the first contact.

[0019] Preferably, an annular groove is provided along the circumferential direction on the inner side wall of the receiving cavity. The conductive finger is arranged in the annular groove, and the outer diameter of the baffle assembly is smaller than the inner diameter of the conductive finger.

[0020] Preferably, the receiving cavity includes a first installation groove and a second installation groove that communicate with each other. The baffle assembly and the conductive finger are located in the first installation groove. The first contact penetrates through the first installation groove and the second installation groove. The head end of the first contact is flush with the head end of the baffle assembly at the opening of the first installation groove away from the second installation groove. The elastic energy storage member arranged on the first contact is located in the second installation groove and is slidably matched with the second installation groove.

[0021] Preferably, the inner diameter of the second installation groove is smaller than the inner diameter of the first installation groove. The second installation groove and the first installation groove are communicated through a connecting hole, and the inner diameter of the connecting hole is smaller than the inner diameter of the second installation groove.

[0022] Preferably, an elastic retaining ring is further sleeved on the middle part of the first contact. During the closing process, the elastic retaining ring abuts against the side wall of the first installation groove close to the connecting hole, so that the head end of the first contact is inserted into the mating hole of the moving contact.

[0023] In a contact mechanism of the present invention, a baffle assembly is arranged between the first contact and the conductive finger. When the moving contact performs opening and closing movements, the moving contact cooperates with the baffle assembly, so that the arc generated between the moving contact and the first contact is blocked and extinguished by the baffle assembly, thereby avoiding damage to the conductive finger caused by the arc.

[0024] In addition, the baffle assembly and the first contact are flush at the opening of the receiving cavity. When opening, the head end of the first contact is pulled out of the receiving cavity, so that the arc is extinguished outside the receiving cavity, and the elastic energy storage member enables the first contact to quickly separate from the moving contact, further reducing the damage to the conductive finger caused by the arc.

[0025] In addition, an elastic limiting structure is arranged between the head end of the first contact and the head end of the baffle assembly, which is beneficial to keeping the head ends of the first contact and the baffle assembly flush.

[0026] In addition, during closing, there is no electrical connection between the head end of the first contact and the moving contact, preventing the first contact from being burned out due to long-term energization. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a contact mechanism of the present invention before closing;

[0028] Figure 2 is a schematic structural diagram of a contact mechanism of the present invention when closing is completed;

[0029] Figure 3 is a schematic structural diagram of the first contact being pulled out by the moving contact when the contact mechanism of the present invention is opening;

[0030] Figure 4 is a schematic structural diagram of the first contact retracting when the contact mechanism of the present invention is opening;

[0031] Figure 5 is a schematic structural diagram of an arc being generated between the moving contact and the first contact when the contact mechanism of the present invention is opening;

[0032] Figure 6 is a schematic structural diagram of the arc extinguishing when the contact mechanism of the present invention is opening;

[0033] Figure 7 is a schematic structural diagram of the contact mechanism of the present invention when opening is completed;

[0034] Figure 8 is a schematic structural diagram of the elastic limit structure in the contact mechanism of the present invention when the baffle assembly and the first contact assembly are kept flush;

[0035] Figure 9 is a schematic structural diagram of the first contact being pulled out in the contact mechanism of the present invention;

[0036] Figure 10 is a schematic structural diagram of the moving contact in the contact mechanism of the present invention;

[0037] Figure 11 is a schematic structural diagram of the static contact seat in the contact mechanism of the present invention. Detailed Embodiments

[0038] The following, in combination with the Figures 1 to 11 embodiments given, further illustrate the specific embodiments of a contact mechanism of the present invention. The contact mechanism of the present invention is not limited to the descriptions of the following embodiments.

[0039] A contact mechanism includes a moving contact 1 and a static contact base 2 that cooperate with each other. The static contact base 2 is provided with a receiving cavity. A conductive contact finger 3 and a first contact assembly 4 are assembled in the receiving cavity. The first contact assembly 4 includes a first contact 41 electrically connected to the receiving cavity. When in the conducting state, the moving contact 1 extends into the receiving cavity. The mating hole 11 provided at the end of the moving contact 1 is inserted and mated with the head end of the first contact 41. At the same time, the outer side of the moving contact 1 is inserted and mated with the conductive contact finger 3. A baffle assembly 5 capable of performing telescopic movement in the receiving cavity is further assembled between the first contact assembly 4 and the conductive contact finger 3. During the opening and closing process, when an arc a is generated between the moving contact 1 and the first contact 41, the baffle assembly 5 is located between the head end of the first contact 41 and the conductive contact finger 3 to block the arc a.

[0040] In a contact mechanism of the present invention, a baffle assembly 5 is provided between the first contact 41 and the conductive contact finger 3. When the moving contact 1 performs the opening and closing movement, the moving contact 1 cooperates with the baffle assembly 5, and the arc a generated between the moving contact 1 and the first contact 41 is blocked and extinguished by the baffle assembly 5, thereby avoiding damage to the conductive contact finger 3 caused by the arc a.

[0041] Combined with Figures 1-11 Provide an embodiment. The contact mechanism includes a moving contact 1 and a static contact base 2 that cooperate with each other. The static contact base 2 is the main element for conducting current. A receiving cavity is provided in the middle of the static contact base 2. A conductive contact finger 3 is assembled in the receiving cavity. When the moving contact 1 extends into the receiving cavity, electrical connection is achieved by inserting and mating with the conductive contact finger 3. A first contact assembly 4 and a baffle assembly 5 are assembled in the receiving cavity. The first contact assembly 4 and the baffle assembly 5 are disposed through the middle of the conductive contact finger 3. The first contact assembly 4 includes a first contact 41 and an elastic energy storage member assembled on the first contact 41. Preferably, the elastic energy storage member is assembled at the tail end of the first contact 41. The elastic energy storage member is slidably and electrically connected to the receiving cavity. The head end of the first contact 41 passes through the conductive contact finger 3 for inserting and mating with the mating hole 11 at the end of the moving contact 1. When the moving contact 1 performs the opening and closing movement, the first contact 41 can perform rapid linear reciprocating movement along a straight line in the receiving cavity through the joint cooperation of the insertion with the mating hole 11 and the elastic energy storage member, thereby improving the opening and closing speed. Preferably, the first contact 41 and the moving contact 1 move along the same straight line, that is, the central axes of the first contact 41, the receiving cavity, the conductive contact finger 3, and the moving contact 1 coincide. Of course, the first contact 41 can also be replaced by a contact fixedly provided in the receiving cavity. Although the fixed contact will affect the breaking speed, it will not interfere with the telescopic movement of the baffle assembly 5, so that the baffle assembly 5 can still protect the conductive contact finger 3.

[0042] The baffle assembly 5 is sleeved outside the first contact assembly 4. The leading end of the baffle assembly 5 is flush with the leading end of the first contact 41. Preferably, an elastic limit structure is provided between the leading end of the baffle assembly 5 and the leading end of the first contact 41, so that the leading ends of the baffle assembly 5 and the first contact 41 are kept flush. When the moving contact 1 extends into or pulls out of the accommodating cavity for opening and closing movement, the moving contact 1 presses against the leading end of the baffle assembly 5 to cause the baffle assembly 5 to perform telescopic movement in the accommodating cavity. When an arc a is generated between the moving contact 1 and the leading end of the first contact 41, the leading end of the baffle assembly 5 is always located between the conductive finger 3 and the leading end of the first contact 41 to block and extinguish the arc a, avoiding damage to the conductive finger 3 by the arc a. In this embodiment, the elastic limit structure includes an elastic limit portion 411 and an elastic engagement portion 512 that cooperate with each other. The elastic limit portion 411 is provided on the first contact 41, and the elastic engagement portion 512 is provided at the leading end of the baffle assembly 5. The elastic limit portion 411 and the elastic engagement portion 512 can be a cooperating boss structure or a cooperating boss and groove structure. The shapes of the boss and groove structures are not specifically limited. The boss can be a continuous annular boss or multiple bosses arranged at intervals around. Correspondingly, the groove structure can also be a continuous annular groove or multiple grooves arranged at intervals around.

[0043] Preferably, the leading end of the baffle assembly 5 is flush with the leading end of the first contact 41 at the opening of the accommodating cavity. Thus, as Figure 1 、 2 shown, during the closing process, when an arc a is generated as the moving contact 1 approaches the leading end of the first contact 41, the leading end of this baffle assembly 5 is located between the leading end of the first contact 41 and the conductive finger 3. The leading end of the baffle assembly 5 restricts the arc a within a certain range, thereby protecting the conductive finger 3. Subsequently, the moving contact 1 is in top-pressure cooperation with the leading end of the baffle assembly 5 at the opening of the accommodating cavity. As the moving contact 1 extends into the interior of the accommodating cavity, the baffle assembly 5 is pressed and contracted. At the same time, when the first contact 41 is inserted into the mating hole 11, the arc a is completely extinguished. Finally, the moving contact 1 and the conductive finger 3 complete the insertion and mating to complete the closing.

[0044] As Figures 3-9 shown, during the opening process, the moving contact 1 first separates from the conductive finger 3. As the moving contact 1 is pulled out of the accommodating cavity, the leading end of the baffle assembly 5 and the moving contact 1 have released the top-pressure cooperation. After the baffle assembly 5 is stretched and reset, it is located between the leading end of the first contact 41 and the conductive finger 3. The moving contact 1 and the leading end of the first contact 41 first remain inserted and are pulled out of the accommodating cavity for a certain distance. The elastic energy storage member stores energy (see Figure 3 、 4 and 9). Subsequently, the moving contact 1 separates from the leading end of the first contact 41 to generate an arc a, and the elastic energy storage member releases energy (see Figure 5 and 8), the head end of the first contact 41 quickly retracts to the opening of the receiving cavity to be flush with the head end of the baffle assembly 5, achieving quick breaking, and at this time the arc a extinguishes (see Figure 6 ), the moving contact 1 further moves in the opening direction, and a switch break is formed between the moving contact 1 and the static contact seat 2 (see Figure 7 ).

[0045] Furthermore, the mating hole 11 of the moving contact 1 includes a friction end 111 and an isolation end 112 (see Figure 10 ), where the friction end 111 is located at the outer end of the mating hole 11. The friction end 111 cooperates with the head end of the first contact 41 during opening, so that the moving contact 1 drives the first contact 41 to move linearly out of the receiving cavity through the frictional force between the two. The isolation end 112 is located at the inner end of the mating hole 11. The isolation end 112 cooperates with the head end of the first contact 41 during closing. At this time, there is no electrical connection between the head end of the first contact 41 and the moving contact 1, thus avoiding the first contact 41 with poor current conduction ability from being energized for a long time, resulting in overheating and even being burned out.

[0046] Combined with Figure 10 The specific structure of the moving contact 1 in this embodiment is provided. The moving contact 1 is integrally in a rod-shaped structure. The rightward movement of the moving contact 1 is the closing movement direction, and the leftward movement is the opening movement direction. A mating hole 11 is provided at one end of the moving contact 1, which is the right end in the figure. The mating hole 11 is preferably a stepped hole with a thinner outer end and a thicker inner end. The thinner end is used as the friction end 111, and the thicker end is used as the isolation end 112. The inner diameter of the friction end 111 is slightly smaller than the elastic outer diameter of the head end of the first contact 41. In this way, during the opening movement, the head end of the first contact 41 is pulled out of the receiving cavity by a certain distance through the elastic friction between the friction end 111 and the head end of the first contact 41; the inner diameter of the isolation end 112 is larger than the outer diameter of the first contact 41. In this embodiment, the outer diameter of the head end of the first contact 41 is the largest, and the inner diameter of the isolation end 112 is preferably larger than the outer diameter of the head end of the first contact 41, so that the two cannot contact during closing and plugging cooperation, thus achieving isolation. Of course, the mating hole 11 can also be a straight hole with the same inner diameter. By setting elastic materials at the friction end 111, there is enough frictional force when the first contact 41 cooperates with the friction end 111, and different materials are coated at the isolation end 112, so that there is no electrical connection when the first contact 41 cooperates with the isolation end 112.

[0047] Such as Figure 11As shown, the static contact base 2, as the main conductive component, preferably adopts a smooth transition structure conducive to optimizing the electric field effect, and the end of the static contact base 2 facing the moving contact 1 has a design with a large chamfer. At least one end of the static contact base 2 is open, and a receiving cavity is provided in the middle of the static contact base 2. A conductive finger 3, a first contact assembly 4, and a baffle assembly 5 are assembled in the receiving cavity, so that the static contact base 2 shields the internal components.

[0048] The receiving cavity includes a first installation groove 21 and a second installation groove 22 that communicate with each other. Preferably, the first installation groove 21 and the second installation groove 22 are communicated through a connection hole 23. One end of the first installation groove 21 away from the second installation groove 22 is open. The inner diameter of the first installation groove 21 is larger than that of the second installation groove 22, and the inner diameter of the second installation groove 22 is larger than that of the connection hole 23. An annular groove 24 is provided along the side wall of the first installation groove 21 in the circumferential direction. Preferably, the annular groove 24 is located at one end away from the second installation groove 22, and there is a distance between the annular groove 24 and the opening of the first installation groove 21. The conductive finger 3 is assembled in the annular groove 24, and the moving contact 1 extends into the first installation groove 21 and is inserted into the conductive finger 3 to complete closing.

[0049] As Figures 1-9As shown, the first contact assembly 4 includes a first contact 41, an elastic retaining ring 45, and an elastic energy storage member. The first contact 41 is a rod structure penetrating through the accommodation cavity. The first end of the first contact 41 is located at the opening of the first installation groove 21 for insertion into the mating hole 11 of the moving contact 1. The outer sidewall of the first end of the first contact 41 protrudes radially to form an annular boss structure. The annular boss structure serves as an elastic limiting portion 411, making the outer sidewall of the first end of the first contact 41 a stepped structure. The elastic limiting portion 411 is used to cooperate with the baffle assembly 5 to keep the baffle assembly 5 flush with the first end of the first contact 41. Additionally, the elastic limiting portion 411, being the part with the largest outer diameter in the first contact 41, makes the first end of the first contact 41 elastic. When the first contact 41 is inserted into and mated with the mating hole 11, the inner diameters of the friction end 111 and the isolation end 112 of the mating hole 11 are set with reference to the outer diameter of the elastic limiting portion 411. The elastic retaining ring 45 is sleeved on the middle part of the first contact 41, located in the first installation groove 21 and capable of being in limiting cooperation with the first installation groove 21. The tail end of the first contact 41 and the elastic energy storage member are located in the second installation groove 22. The elastic energy storage member includes a contact piece 42, an insulating guide plate 43, and a contact spring 44. The contact piece 42 is fixedly arranged at the tail end of the first contact 41 and is electrically connected to the accommodation cavity. In this embodiment, the contact piece 42 is fixed to the end of the tail end of the first contact 41 by screws. The insulating guide plate 43 is sleeved on the middle part of the first contact 41 and is in insulating cooperation with the accommodation cavity. The contact spring 44 is sleeved on the first contact 41 between the contact piece 42 and the insulating guide plate 43. The contact piece 42 is in sliding cooperation with the accommodation cavity, and the insulating guide plate 43 is fixedly connected to the second installation groove 22, specifically fixed at one end of the second installation groove 22 close to the first installation groove 21.

[0050] In this embodiment, the inner diameter of the elastic retaining ring 45 is larger than the aperture of the connection hole 23, and the outer diameters of the contact piece 42 and the insulating guide plate 43 are the same as the inner diameter in the second installation groove 22. During closing, referring to Figure 1 、 2 and 8, the elastic retaining ring 45 abuts against the sidewall of the first installation groove 21 near one end of the connection hole 23, and the first contact 41 is limited and cannot be pushed, causing the first end of the first contact 41 to overcome the friction force with the friction end 111 and extend into the isolation end 112 to complete the insertion and mating. During opening, referring to Figures 3-7, as shown in FIGS. 9, the friction end 111 cooperates with the head end of the first contact 41 to pull the first contact 41 out of the receiving cavity (pull the first contact 41 to the left). At this time, the contact piece 42 is driven to slide in the direction of the first installation groove 21 (to the left in the figure). The contact spring 44 is compressed and stores energy under the action of the contact piece 42 and the insulating guide plate 43. Subsequently, due to the continuous movement of the moving contact 1 in the opening direction, the insulating guide plate 43 cooperates with the second installation groove 22 to prevent the first contact 41 from being further pulled. As a result, the head end of the first contact 41 and the friction end 111 are separated after overcoming the friction force. At this time, the contact spring 44 releases energy to make the contact piece 42 slide in the direction away from the first installation groove 21 (to the right in the figure). The first contact 41 retracts into the receiving cavity, and the head end of the first contact 41 is located at the opening of the first installation groove 21. The moving contact 1 continues to move, forming an opening break between the moving contact 1 and the first contact 41 of the static contact seat 2 and the head end of the baffle assembly 5. It should be noted that in this embodiment, when the first contact 41 is closed, due to the position of the elastic retaining ring 45 abutting against the side wall of the first installation groove 21, the first contact 41 does not perform a linear motion when closed, but only performs a linear reciprocating motion when opening. Of course, by changing the position of the elastic retaining ring 45 or extending the length of the first installation groove 21, the first contact 41 can also perform a linear reciprocating motion when closed.

[0051] The contact piece 42 is always electrically connected to the receiving cavity. One end of the contact spring 44 is connected to the contact piece 42, and the other end of the contact spring 44 is connected to the insulating guide plate 43, so that no current flows through the contact spring 44, and the contact spring 44 is equipotential with the static contact seat 2.

[0052] As Figures 1-9 shown, the baffle assembly 5 is sleeved around the first contact 41. The baffle assembly 5 is completely located in the first installation groove 21 and the outer diameter of the baffle assembly 5 is smaller than the inner diameter of the conductive finger 3, so that the baffle assembly 5 will not contact the conductive finger 3 during the telescopic movement. The baffle assembly 5 includes an annular baffle 51 and an elastic member 52. The annular baffle 51, as the head end of the baffle assembly 5, is made of an insulating and high-temperature resistant material. The central hole 511 of the annular baffle 51 allows the first contact 41 to pass through. A convex platform serving as an elastic engaging portion 512 is provided at one end of the central hole 511 of the annular baffle 51 close to the elastic member 52. The elastic engaging portion 512 protrudes along the circumferential direction of the central hole 511, and the elastic engaging portion 512 makes the side wall of the central hole 511 have a stepped structure as a whole. Among them, the inner diameter of the central hole 511 where the elastic engaging portion 512 is provided is smaller than the outer diameter of the first contact 41 where the elastic limiting portion 411 is provided, and the inner diameter of the central hole 511 where the elastic engaging portion 512 is not provided is greater than or equal to the outer diameter of the first contact 41 where the elastic limiting portion 411 is provided. The annular baffle 51 is engaged with the head end of the first contact 41 through the elastic engaging portion 512, so that the annular baffle 51 and the head end of the first contact 41 are flush (see Figure 8)。The elastic member 52 is sleeved on the middle part of the first contact 41 as the tail end of the baffle assembly 5. The elastic force of the elastic member 52 is less than that of the contact spring 44 in the elastic energy storage member, which is beneficial to the pressing fit between the moving contact 1 and the baffle assembly 5. One end of the elastic member 52 is insulatedly connected to the annular baffle 51, and the other end of the elastic member 52 is electrically connected to the accommodating cavity, specifically connected to one end of the first installation groove 21 close to the second installation groove 22, so that no current flows through the elastic member 52, and the elastic member 52 is equipotential with the static contact base 2.

[0053] During closing, the end of the moving contact 1 abuts against the annular baffle 51 and compresses the elastic member 52 by pressing the annular baffle 51. At this time, the annular baffle 51 gradually retracts into the first installation groove 21 as the moving contact 1 extends, so that the moving contact 1 and the conductive contact finger 3 can be inserted and matched. During opening, when the moving contact 1 is pulled out of the first installation groove 21, as the moving contact 1 moves, the elastic member 52 releases energy, and the annular baffle 51 is pushed to return to the opening of the first installation groove 21 together with the moving contact 1.

[0054] It should be noted that the first contact 41 and the annular baffle 51 may not be completely flush. Compared with the annular baffle 51, the head end of the first contact 41 can be slightly retracted into the accommodating cavity a little bit, which is also acceptable. In addition, arc transitions are adopted at the edges of the annular baffle 51, the first contact 41, the moving contact 1, the elastic limiting portion 411 and the elastic engaging portion 512, which is beneficial to improving the mutual cooperation between the components.

[0055] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A contact mechanism includes a moving contact (1) and a static contact base (2) that cooperate with each other. A receiving cavity is provided in the static contact base (2), and a conductive contact finger (3) and a first contact assembly (4) are assembled in the receiving cavity. The first contact assembly (4) includes a first contact (41) electrically connected to the receiving cavity. When in the conducting state, the moving contact (1) extends into the receiving cavity, and a mating hole (11) provided at the end of the moving contact (1) is inserted and mated with the leading end of the first contact (41). At the same time, the outer side of the moving contact (1) is inserted and mated with the conductive contact finger (3). Characterized in that: A baffle assembly (5) capable of performing telescopic movement in the receiving cavity is further assembled between the first contact assembly (4) and the conductive contact finger (3). During the opening and closing process, when an arc (a) is generated between the moving contact (1) and the first contact (41), the baffle assembly (5) is located between the leading end of the first contact (41) and the conductive contact finger (3) to block the arc (a); during the closing process, when an arc (a) is generated when the moving contact (1) approaches the leading end of the first contact (41), the baffle assembly (5) is located between the leading end of the first contact (41) and the conductive contact finger (3). Subsequently, the baffle assembly (5) contracts under the pressing of the moving contact (1), and the arc (a) is extinguished when the first contact (41) is inserted into the mating hole (11). Finally, the moving contact (1) is inserted and mated with the conductive contact finger (3) to complete the closing; During the opening process, the moving contact (1) is first separated from the conductive contact finger (3) to cut off the power. Then, the moving contact (1) is separated from the leading end of the first contact (41) and an arc (a) is generated. The baffle assembly (5) is reset so that the baffle assembly (5) is located between the leading end of the first contact (41) and the conductive contact finger (3).

2. A contact mechanism according to claim 1, Characterized in that: The first contact assembly (4) further includes an elastic energy storage member. When the moving contact (1) performs an opening movement, the leading end of the first contact (41) is pulled out of the receiving cavity by a certain distance, and the elastic energy storage member stores energy. When the leading end of the first contact (41) is separated from the moving contact (1), the elastic energy storage member releases energy to quickly retract the leading end of the first contact (41) into the receiving cavity.

3. A contact mechanism according to claim 2, Characterized in that: The leading end of the baffle assembly (5) is flush with the leading end of the first contact (41) at the opening of the receiving cavity.

4. A contact mechanism according to claim 2, Characterized in that: The outer end of the mating hole (11) is a friction end (111). During opening, the leading end of the first contact (41) cooperates with the friction end (111) to pull the first contact (41) to move with the moving contact (1), thereby storing energy in the elastic energy storage member; the inner end of the mating hole (11) is an isolation end (112). During closing, the leading end of the first contact (41) extends into the isolation end (112) after overcoming the friction with the friction end (111), and there is no electrical connection between the isolation end (112) and the first contact (41).

5. A contact mechanism according to claim 4, Characterized in that: The mating hole (11) is a stepped hole with a thick inner end and a thin outer end. The thicker end of the mating hole (11) is the isolation end (112), and the inner diameter of the isolation end (112) is greater than the outer diameter of the head end of the first contact (41). The inner diameter of the friction end (111) is smaller than the outer diameter of the elastic head end of the first contact (41).

6. A contact mechanism according to any one of claims 1-5, characterized in that: An elastic limiting structure is provided between the head end of the baffle assembly (5) and the head end of the first contact (41), and the head end of the baffle assembly (5) and the head end of the first contact (41) are kept flush by the elastic limiting structure.

7. A contact mechanism according to claim 2, characterized in that: A ring-shaped boss structure protrudes radially from the outer side wall of the head end of the first contact (41). The ring-shaped boss structure serves as an elastic limiting portion (411). The head end of the baffle assembly (5) is kept flush with the head end of the quick contact by cooperating with the elastic limiting portion (411). The first contact (41) and the moving contact (1) move along the same straight line.

8. A contact mechanism according to claim 2, characterized in that: The elastic energy storage member includes a contact piece (42), an insulating guide plate (43), and a contact spring (44). The contact piece (42) is fixedly arranged at the tail end of the first contact (41) and is electrically connected to the receiving cavity. The insulating guide plate (43) is sleeved on the middle part of the first contact (41) and is in insulating cooperation with the receiving cavity. The contact spring (44) is sleeved on the first contact (41) between the contact piece (42) and the insulating guide plate (43). The contact piece (42) is in sliding cooperation with the receiving cavity, and the insulating guide plate (43) is fixedly connected to the receiving cavity.

9. A contact mechanism according to claim 1, characterized in that: The baffle assembly (5) includes an annular baffle (51) and an elastic member (52). The central hole (511) of the annular baffle (51) allows the first contact (41) to pass through. The elastic member (52) is sleeved on the middle part of the first contact (41). One end of the elastic member (52) is insulatedly connected to the annular baffle (51), and the other end of the elastic member (52) is connected to the receiving cavity.

10. A contact mechanism according to claim 9, characterized in that: A boss serving as an elastic engaging portion (512) is provided at one end of the central hole (511) of the annular baffle (51) close to the elastic member (52). The elastic engaging portion (512) protrudes annularly along the central hole (511). The annular baffle (51) is engaged with the head end of the first contact (41) through the elastic engaging portion (512) to keep the annular baffle (51) flush with the head end of the first contact (41).

11. A contact mechanism according to claim 1, characterized in that: An annular groove (24) is provided along the circumferential direction on the inner side wall of the receiving cavity. The conductive contact finger (3) is arranged in the annular groove (24), and the outer diameter of the baffle assembly (5) is smaller than the inner diameter of the conductive contact finger (3).

12. A contact mechanism according to claim 2, characterized in that: The accommodation cavity includes a first installation groove (21) and a second installation groove (22) that are communicated with each other. The baffle assembly (5) and the conductive finger (3) are located in the first installation groove (21). The first contact (41) is disposed through the first installation groove (21) and the second installation groove (22). The leading end of the first contact (41) is flush with the leading end of the baffle assembly (5) at the opening of the first installation groove (21) away from the second installation groove (22). The elastic energy storage member disposed on the first contact (41) is located in the second installation groove (22) and is in sliding fit with the second installation groove (22).

13. A contact mechanism according to claim 12, characterized in that: The inner diameter of the second installation groove (22) is smaller than the inner diameter of the first installation groove (21). The second installation groove (22) is communicated with the first installation groove (21) through a connection hole (23), and the inner diameter of the connection hole (23) is smaller than the inner diameter of the second installation groove (22).

14. A contact mechanism according to claim 12, characterized in that: An elastic retaining ring (45) is further sleeved on the middle part of the first contact (41). During the closing process, the elastic retaining ring (45) abuts against the side wall of the first installation groove (21) near one end of the connection hole (23), so that the leading end of the first contact (41) is inserted into the mating hole (11) of the moving contact (1).

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