A vacuum interrupter and vacuum circuit breaker

Abstract

The present invention relates to the technical field of electrical vacuum switches, and specifically to a vacuum interrupter and a vacuum circuit breaker, wherein the vacuum interrupter comprises: a housing; a lower contact rod; a lower main contact; a lower arc contact; an upper contact rod; a reset spring; an upper arc contact; an upper main contact; in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is provided between the upper main contact and the upper contact rod, one end of the lever is connected to the upper main contact in a transmission manner, and the other end is connected to the upper contact rod in a transmission manner, so that when the upper contact rod moves, the upper main contact is driven to move in the opposite direction synchronously. Beneficial effect: the lower end surfaces of the upper main contact and the upper arc contact are staggered up and down, so that it is difficult for the arc to be transferred to the upper main contact, and the ablation of the upper main contact is reduced. The upper contact rod and the upper main contact move in the opposite direction synchronously, so that the upper and lower main contacts can quickly contact and separate, which can save the moving stroke of the lower contact rod, shorten the opening and closing time, reduce the longitudinal size of the vacuum interrupter, and reduce the requirements for the output stroke of the operating mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of electrical vacuum switches, and in particular to a vacuum interrupter and a vacuum circuit breaker. Background Art

[0002] The vacuum interrupter is an important component of the vacuum circuit breaker. The contacts of the vacuum interrupter need to conduct the rated working current under normal conditions and interrupt the fault current under fault conditions, so they need to have good breaking capacity.

[0003] The Chinese utility model patent with the authorization announcement number CN202307674U discloses a vacuum interrupter and a vacuum circuit breaker using the vacuum interrupter, including an upper contact composed of an upper main contact (i.e., an upper main contact) and an upper arc contact, and a lower contact composed of a lower main contact (i.e., a lower main contact) and a lower arc contact, and both the upper arc contact and the lower arc contact are made of contact materials that resist melting welding. The upper arc contact is fixed to the lower end of the upper conductive rod, and the upper conductive rod is connected to the upper main contact through the strap contact finger thereon. A limit pad is provided at the upper end of the upper conductive rod, and an upper contact spring is provided above the limit pad. The lower arc contact is fixed to the lower main contact, and the lower main contact is fixed to the upper end of the lower conductive rod. The lower conductive rod is connected to the circuit breaker operating mechanism through an insulating pull rod with a main contact spring.

[0004] When closing the circuit breaker, the operating mechanism drives the lower conductive rod, the lower main contact, and the lower arc contact to move upward together until the lower arc contact contacts the upper arc contact, and then the lower arc contact continues to move upward together with the upper arc contact, so that the upper contact spring at the upper end of the upper conductive rod is compressed, until the upper main contact and the lower main contact begin to contact, the main contact spring begins to be compressed, and is reliably closed under the action of the contact pressure. At this time, the high current is carried by the upper main contact and the lower main contact. When opening the circuit breaker, the compression of the main contact spring is released, and the lower conductive rod, the lower main contact, and the lower arc contact move downward under the drive of the operating mechanism, so that the compression of the upper contact spring is released. At this time, the upper conductive rod drives the upper arc contact and the lower arc contact to move downward, and the upper main contact and the lower main contact are separated, while the upper arc contact and the lower arc contact are still in the on state until the limit pad contacts the upper end of the vacuum interrupter to limit the upper conductive rod and the upper arc contact to stop moving downward. At this time, the lower conductive rod continues to move downward driven by the operating mechanism until the opening limit is reached, completing the opening action of the circuit breaker.

[0005] During the opening and closing process, an arc is generated between the upper arc contact and the lower arc contact. Although the upper arc contact and the lower arc contact are made of anti-welding contact materials, the contact surface is less burned, and the upper end surface of the lower arc contact is higher than the upper end surface of the lower main contact. However, in the opening state, of course, including when the upper arc contact and the lower arc contact are just closed or opened, the lower end surfaces of the upper arc contact and the upper main contact are flush, that is, there is no offset distance between the lower end surface of the upper arc contact and the lower end surface of the upper main contact in the upper and lower directions. The arc generated in this way can easily be transferred to the upper main contact, causing erosion of the upper main contact.

[0006] In response to the above problem, if the lower end surface of the upper main contact is simply moved up, or the lower end surface of the upper arc contact is moved down, so that the lower end surface of the upper arc contact and the lower end surface of the upper main contact are staggered in the up and down directions, the lower main contact will require a larger upward stroke to contact the upper main contact, and a larger downward stroke to separate from the upper main contact, that is, the moving stroke of the lower conductive rod is increased. This will not only prolong the opening and closing time, but also increase the longitudinal size of the vacuum interrupter, and at the same time put forward higher requirements on the output stroke of the operating mechanism. This is a difficult problem that needs to be solved urgently. Summary of the invention

[0007] The object of the present invention is to provide a vacuum arc extinguishing chamber that can reduce the ablation of the upper main contact without increasing the moving stroke of the lower conductive rod; the object of the present invention is also to provide a vacuum circuit breaker that can reduce the ablation of the upper main contact without increasing the moving stroke of the lower conductive rod.

[0008] In order to achieve the above purpose, the vacuum interrupter in the present invention adopts the following technical solutions:

[0009] A vacuum interrupter, comprising:

[0010] case;

[0011] A lower contact rod, the upper end of which extends into the interior of the housing, and the lower end of which is used for transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the housing to realize opening and closing;

[0012] A lower main contact, arranged at the upper end of the lower contact rod;

[0013] A lower arcing contact is conductively connected to the lower main contact, and an upper end surface of the lower arcing contact is higher than an upper end surface of the lower main contact;

[0014] An upper contact rod, the lower end of which extends into the housing, and the upper contact rod is assembled on the housing so as to be movable up and down;

[0015] A reset spring is used to deform when the upper contact rod moves upward, so as to provide a reset force for the upper contact rod to move downward;

[0016] An upper arc contact is arranged at the lower end of the upper contact rod;

[0017] An upper main contact, conductively connected to the upper arcing contact;

[0018] When in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, and the lever linkage mechanism comprises a lever, one end of the lever is transmission connected to the upper main contact, and the other end of the lever is transmission connected to the upper contact rod, so that when the upper contact rod moves up and down, the upper main contact is driven to move in the opposite direction synchronously through the lever linkage mechanism.

[0019] The beneficial effect of the above technical solution is that: when in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact, that is, the lower end surface of the upper main contact and the lower end surface of the upper arc contact are staggered in the up and down directions, and the lower end surface of the upper main contact is arranged away from the lower end surface of the upper arc contact. In this way, during the opening and closing process, the arc generated between the upper arc contact and the lower arc contact is difficult to transfer to the upper main contact, thereby reducing the ablation of the upper main contact.

[0020] At the same time, since a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, the lever linkage mechanism includes a lever, one end of the lever is transmission-connected to the upper main contact, and the other end of the lever is transmission-connected to the upper contact rod, and the lever plays a role of reversing. Therefore, when the upper contact rod moves up and down, the lever linkage mechanism can be utilized to drive the upper main contact to move in the opposite direction synchronously. That is, when the circuit breaker is closed, the upper contact rod moves upward under the push of the lower contact rod, and the upper main contact can move downward synchronously, so that it can quickly contact with the lower main contact, thus saving the upward movement stroke of the lower contact rod. Therefore, it can not only shorten the closing time, but also reduce the longitudinal size of the vacuum arc extinguishing chamber, and at the same time reduce the requirements for the output stroke of the operating mechanism.

[0021] Conversely, when opening the switch, the upper contact rod moves downward to reset under the action of the reset spring, and the upper main contact moves upward under the action of the lever linkage mechanism, so that it can quickly separate from the lower main contact, saving the downward movement of the lower contact rod, and also shortening the opening time. In addition, during the upward movement of the upper main contact, the lower end surface of the upper main contact and the lower end surface of the upper arc contact quickly pull apart in the vertical direction, so that at the moment when the upper arc contact and the lower arc contact are separated, the lower end surface of the upper main contact has moved to the upper side of the lower end surface of the upper arc contact, so that the arc generated between the upper arc contact and the lower arc contact is not easily transferred to the upper main contact, reducing the ablation of the upper main contact.

[0022] Furthermore, in order to facilitate arrangement and assembly, the upper main contact is arranged outside the upper arc contact.

[0023] Furthermore, in order to facilitate the setting and installation of the upper main contact, an upper cover plate is provided at the upper end of the shell, and a conductive tube extending up and down and with the lower end extending into the interior of the shell is fixed on the upper cover plate. The upper main contact is arranged on the outside of the conductive tube and is in sliding contact and conductive cooperation with the outer wall of the conductive tube, and the upper contact rod passes through the conductive tube up and down.

[0024] Furthermore, in order to facilitate the arrangement and assembly of the lever linkage mechanism, the lever linkage mechanism also includes a cylinder body arranged above the shell, the cylinder body having a cylinder body bottom wall and a cylinder body side wall, the cylinder body bottom wall is fixedly connected to the top end of the conductive tube, the top end of the upper contact rod extends into the cylinder body, the lever is rotatably installed in the cylinder body, and the lever linkage mechanism also includes a linkage rod having one end connected to the upper main contact and the other end extending into the cylinder body through the upper cover plate and the cylinder bottom wall, one end of the lever is transmission connected to the linkage rod, and the other end of the lever is transmission connected to the upper contact rod.

[0025] Furthermore, in order to facilitate the conductive connection between the upper contact rod and the upper main contact, the upper contact rod and the conductive tube are gap-matched, a conductive block is fixed on the bottom wall of the cylinder, the upper end of the upper contact rod passes through the conductive block, the upper contact rod and the conductive block are plugged and conductively matched, and the conductive block is conductively connected to the conductive tube through the bottom wall of the cylinder.

[0026] Furthermore, in order to facilitate the transmission connection between the upper contact rod and the lever, a pressure cover is connected to the upper end of the upper contact rod, and the pressure cover is transmission connected to the lever.

[0027] Furthermore, in order to facilitate the movement of the lever and prevent the lever from getting stuck, transition connecting rods are respectively connected between the pressure cover and the lever, and between the linkage rod and the lever.

[0028] Furthermore, in order to facilitate the movement of the pressure cover, the pressure cover is sleeved on the outside of the conductive block, and the pressure cover and the conductive block are guided and slidably matched in the up and down directions.

[0029] Furthermore, in order to facilitate the arrangement of the reset spring, a fixing plate is fixedly provided in the cylinder, the fixing plate is located above the pressure cover, a stop column extending downward is fixed on the fixing plate, the lower end surface of the stop column is used to cooperate with the upper end surface of the pressure cover when the switch is closed, the reset spring is sleeved on the stop column, one end of the reset spring presses on the fixing plate, and the other end presses on the pressure cover.

[0030] In order to achieve the above object, the vacuum circuit breaker in the present invention adopts the following technical solution:

[0031] A vacuum circuit breaker comprises an operating mechanism and a vacuum interrupter connected to the operating mechanism, wherein the vacuum interrupter comprises:

[0032] case;

[0033] A lower contact rod, the upper end of which extends into the interior of the housing, and the lower end of which is used for transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the housing to realize opening and closing;

[0034] A lower main contact, arranged at the upper end of the lower contact rod;

[0035] A lower arcing contact is conductively connected to the lower main contact, and an upper end surface of the lower arcing contact is higher than an upper end surface of the lower main contact;

[0036] An upper contact rod, the lower end of which extends into the housing, and the upper contact rod is assembled on the housing so as to be movable up and down;

[0037] A reset spring is used to deform when the upper contact rod moves upward, so as to provide a reset force for the upper contact rod to move downward;

[0038] An upper arc contact is arranged at the lower end of the upper contact rod;

[0039] An upper main contact, conductively connected to the upper arcing contact;

[0040] When in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, and the lever linkage mechanism comprises a lever, one end of the lever is transmission connected to the upper main contact, and the other end of the lever is transmission connected to the upper contact rod, so that when the upper contact rod moves up and down, the upper main contact is driven to move in the opposite direction synchronously through the lever linkage mechanism.

[0041] The beneficial effect of the above technical solution is that: when in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact, that is, the lower end surface of the upper main contact and the lower end surface of the upper arc contact are staggered in the up and down directions, and the lower end surface of the upper main contact is arranged away from the lower end surface of the upper arc contact. In this way, during the opening and closing process, the arc generated between the upper arc contact and the lower arc contact is difficult to transfer to the upper main contact, thereby reducing the ablation of the upper main contact.

[0042] At the same time, since a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, the lever linkage mechanism includes a lever, one end of the lever is transmission-connected to the upper main contact, and the other end of the lever is transmission-connected to the upper contact rod, and the lever plays a role of reversing. Therefore, when the upper contact rod moves up and down, the lever linkage mechanism can be utilized to drive the upper main contact to move in the opposite direction synchronously. That is, when the circuit breaker is closed, the upper contact rod moves upward under the push of the lower contact rod, and the upper main contact can move downward synchronously, so that it can quickly contact with the lower main contact, thus saving the upward movement stroke of the lower contact rod. Therefore, it can not only shorten the closing time, but also reduce the longitudinal size of the vacuum arc extinguishing chamber, and at the same time reduce the requirements for the output stroke of the operating mechanism.

[0043] Conversely, when opening the switch, the upper contact rod moves downward to reset under the action of the reset spring, and the upper main contact moves upward under the action of the lever linkage mechanism, so that it can quickly separate from the lower main contact, saving the downward movement of the lower contact rod, and also shortening the opening time. In addition, during the upward movement of the upper main contact, the lower end surface of the upper main contact and the lower end surface of the upper arc contact quickly pull apart in the vertical direction, so that at the moment when the upper arc contact and the lower arc contact are separated, the lower end surface of the upper main contact has moved to the upper side of the lower end surface of the upper arc contact, so that the arc generated between the upper arc contact and the lower arc contact is not easily transferred to the upper main contact, reducing the ablation of the upper main contact.

[0044] Furthermore, in order to facilitate arrangement and assembly, the upper main contact is arranged outside the upper arc contact.

[0045] Furthermore, in order to facilitate the setting and installation of the upper main contact, an upper cover plate is provided at the upper end of the shell, and a conductive tube extending up and down and with the lower end extending into the interior of the shell is fixed on the upper cover plate. The upper main contact is arranged on the outside of the conductive tube and is in sliding contact and conductive cooperation with the outer wall of the conductive tube, and the upper contact rod passes through the conductive tube up and down.

[0046] Furthermore, in order to facilitate the arrangement and assembly of the lever linkage mechanism, the lever linkage mechanism also includes a cylinder body arranged above the shell, the cylinder body having a cylinder body bottom wall and a cylinder body side wall, the cylinder body bottom wall is fixedly connected to the top end of the conductive tube, the top end of the upper contact rod extends into the cylinder body, the lever is rotatably installed in the cylinder body, and the lever linkage mechanism also includes a linkage rod having one end connected to the upper main contact and the other end extending into the cylinder body through the upper cover plate and the cylinder bottom wall, one end of the lever is transmission connected to the linkage rod, and the other end of the lever is transmission connected to the upper contact rod.

[0047] Furthermore, in order to facilitate the conductive connection between the upper contact rod and the upper main contact, the upper contact rod and the conductive tube are gap-matched, a conductive block is fixed on the bottom wall of the cylinder, the upper end of the upper contact rod passes through the conductive block, the upper contact rod and the conductive block are plugged and conductively matched, and the conductive block is conductively connected to the conductive tube through the bottom wall of the cylinder.

[0048] Furthermore, in order to facilitate the transmission connection between the upper contact rod and the lever, a pressure cover is connected to the upper end of the upper contact rod, and the pressure cover is transmission connected to the lever.

[0049] Furthermore, in order to facilitate the movement of the lever and prevent the lever from getting stuck, transition connecting rods are respectively connected between the pressure cover and the lever, and between the linkage rod and the lever.

[0050] Furthermore, in order to facilitate the movement of the pressure cover, the pressure cover is sleeved on the outside of the conductive block, and the pressure cover and the conductive block are guided and slidably matched in the up and down directions.

[0051] Furthermore, in order to facilitate the arrangement of the reset spring, a fixing plate is fixedly provided in the cylinder, the fixing plate is located above the pressure cover, a stop column extending downward is fixed on the fixing plate, the lower end surface of the stop column is used to cooperate with the upper end surface of the pressure cover when the switch is closed, the reset spring is sleeved on the stop column, one end of the reset spring presses on the fixing plate, and the other end presses on the pressure cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of embodiment 1 of the vacuum interrupter of the present invention (open state);

[0053] Figure 2 It is a structural schematic diagram of embodiment 1 of the vacuum interrupter of the present invention (just closed state);

[0054] Figure 3 It is a structural schematic diagram of embodiment 1 of the vacuum interrupter of the present invention (closed state);

[0055] Figure 4 for Figure 1 A magnified view of the upper and middle structures;

[0056] Figure 5 It is a structural schematic diagram of embodiment 2 of the vacuum interrupter of the present invention (open state);

[0057] Figure 6 It is a structural schematic diagram of embodiment 2 of the vacuum interrupter of the present invention (just closed state);

[0058] Figure 7 It is a structural schematic diagram of embodiment 2 of the vacuum interrupter of the present invention (closed state);

[0059] Figure 8 for Figure 5 A partial enlarged view of the middle and upper insulating ring part;

[0060] Fig. 9 for Figure 5 A partial enlarged view of the middle and lower insulating ring parts.

[0061] In the figure: 1-first bellows; 2-conductive tube; 3-upper main contact; 4-upper arc contact; 5-lower arc contact; 6-lower contact rod; 61-boss; 7-lower cover; 8-second bellows; 9-housing; 10-lower main contact; 11-shielding cover; 12-third bellows; 13-upper contact rod; 14-linkage rod; 15-upper cover; 16-lever structure; 161-first transition connecting rod; 162-lever; 163-second transition connecting rod; 164-mounting rod; 17-cylinder; 18-reset spring; 19-conductive block; 20-pressure cover; 21-stop column; 22-fixing plate; 23-fixing column; 24-terminal block; 25-upper insulating ring; 26-stop cylinder; 27-compression spring; 28-lower insulating ring. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0064] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0066] Embodiment 1 of the vacuum interrupter of the present invention is as follows Figure 1 , Figure 2 and Figure 3 As shown, it includes a housing 9, an upper cover plate 15 is provided at the upper end of the housing 9, and a lower cover plate 7 is provided at the lower end. A conductive tube 2 extending up and down and with the lower end extending into the interior of the housing 9 is fixed on the upper cover plate 15, and an upper contact rod 13 passes through the conductive tube 2 up and down, and there is a clearance fit between the upper contact rod 13 and the conductive tube 2. An upper arc contact 4 is fixed at the lower end of the upper contact rod 13, and a third corrugated tube 12 is sleeved on the outer side of the upper contact rod 13, and the upper end of the third corrugated tube 12 is connected to the conductive tube 2, and the lower end is connected to the upper arc contact 4.

[0067] An upper main contact 3 is arranged outside the conductive tube 2. The upper main contact 3 is a cylindrical structure. The upper main contact 3 is located outside the upper arc contact 4. The upper end of the upper main contact 3 is in sliding contact with the outer wall of the conductive tube 2 in the up and down directions for conductive cooperation. In the open state, the lower end surface of the upper main contact 3 is higher than the lower end surface of the upper arc contact 4.

[0068] A lever linkage mechanism is arranged between the upper main contact 3 and the upper contact rod 13, and the lever linkage mechanism is used to make the upper main contact 3 and the upper contact rod 13 move synchronously in opposite directions. The lever linkage mechanism includes a linkage rod 14, a cylinder 17, and a lever structure 16, wherein the cylinder 17 is arranged above the shell 9, and the cylinder 17 has a cylinder bottom wall and a cylinder side wall, and the cylinder bottom wall is fixedly connected to the top of the conductive tube 2. The cylinder 17 is made of conductive material, and a terminal block 24 is arranged at the top of the cylinder side wall.

[0069] There are two linkage rods 14 which are symmetrically arranged on the left and right. The linkage rods 14 pass through the upper cover plate 15 and the bottom wall of the cylinder. The lower end of the linkage rod 14 extends into the shell 9 and is fixedly connected to the upper main contact 3, and the upper end extends into the cylinder 17. A first bellows 1 is arranged in the shell 9, and one end of the first bellows 1 is connected to the linkage rod 14, and the other end is connected to the upper cover plate 15.

[0070] Combination Figure 4 As shown, a conductive block 19 is fixed on the bottom wall of the cylinder 17, and the upper end of the upper contact rod 13 passes through the bottom wall of the cylinder and is inserted into the conductive block 19. The upper contact rod 13 and the conductive block 19 are plug-in conductively matched, and the conductive block 19 is conductively connected to the conductive tube 2 through the bottom wall of the cylinder. In this way, the upper arc contact 4 is indirectly conductively connected to the upper main contact 3 through the upper contact rod 13, the conductive block 19, the bottom wall of the cylinder, and the conductive tube 2 in sequence.

[0071] The upper end of the upper contact rod 13 is connected with a gland 20, which is sleeved on the outside of the conductive block 19, and the gland 20 and the conductive block 19 are guided and slidably matched in the up and down directions. A fixed plate 22 is fixedly arranged in the cylinder 17 through a fixed column 23, and the fixed plate 22 is located above the gland 20. A stop column 21 extending downward is fixed on the fixed plate 22, and the lower end surface of the stop column 21 is used to stop and match with the upper end surface of the gland 20 when the switch is closed, so when the switch is opened, there is a gap between the lower end surface of the stop column 21 and the upper end surface of the gland 20. The outer sleeve of the stop column 21 is provided with a reset spring 18, one end of the reset spring 18 presses on the fixed plate 22, and the other end presses on the gland 20. When the switch is closed, the upper contact rod 13 moves upward, driving the gland 20 to compress the reset spring 18 to deform it under force, thereby providing a reset force for the downward movement of the upper contact rod 13.

[0072] like Figure 4 As shown, the lever structure 16 includes a first transition link 161, a lever 162, and a second transition link 163. A mounting rod 164 is fixedly arranged on the bottom wall of the cylinder. The lever 162 is rotatably mounted on the mounting rod 164. One end of the first transition link 161 is hinged to the pressure cover 20, and the other end is hinged to one end of the lever 162. One end of the second transition link 163 is hinged to the linkage rod 14, and the other end is hinged to one end of the lever 162. In this way, when the upper contact rod 13 drives the pressure cover 20 to move upward, the first transition link 161 drives the lever 162 to rotate, the lever 162 drives the second transition link 163 to move, and then drives the linkage rod 14 to move. After the reversal of the lever 162, the movement directions of the upper contact rod 13 and the linkage rod 14 are opposite.

[0073] In this embodiment, the first transition link 161 and the second transition link 163 are provided, and the second transition link 163 is bent (the first transition link 161 may also be bent according to the use requirements) in order to adapt to the smooth rotation of the lever 162 and avoid the lever 162 from getting stuck. Otherwise, a long hole structure needs to be provided between the lever 162, the gland 20 and the linkage rod 14, which is more complicated and inconvenient to process. At the same time, after using two transition links, the distance between the two linkage rods 14 can be reduced, and the lateral size of the arc extinguishing chamber can be reduced.

[0074] like Figure 1 , Figure 2 and Figure 3As shown, the upper end of the lower contact rod 6 extends into the housing 9, and the lower end is used for transmission connection with the operating mechanism (not shown in the figure), so the lower contact rod 6 can move up and down relative to the housing 9. A second bellows 8 is arranged in the housing 9, and the upper end of the second bellows 8 is connected to the lower contact rod 6, and the lower end is connected to the lower cover plate 7. The upper end of the lower contact rod 6 is fixed with the lower arc contact 5 and the lower main contact 10. In addition, a shielding cover 11 is fixed on the inner wall of the housing 9, and the shielding cover 11 corresponds to the contact position of the upper main contact 3 and the lower main contact 10, and the upper arc contact 4 and the lower arc contact 5.

[0075] The lower arc contact 5 is fixed on the upper end surface of the lower contact rod 6, and is in butt contact with the upper arc contact 4. The lower main contact 10 is also a cylindrical structure, and its lower end is fixed on the outer wall of the lower contact rod 6. The lower main contact 10 is located outside the lower arc contact 5, and the upper end surface of the lower arc contact 5 is higher than the upper end surface of the lower main contact 10. The outer diameter of the lower main contact 10 is smaller than the inner diameter of the upper main contact 3, and the inner hole of the upper main contact 3 constitutes a socket for the lower main contact 10 to be inserted and realize the plug-in contact and electrical conduction of the two.

[0076] When the vacuum interrupter is working, Figure 1 The vacuum circuit breaker is shown in the open state. Figure 2 In the just closed state, Figure 3 In the closing process, under the action of the operating mechanism, the lower contact rod 6 drives the lower arcing contact 5 and the lower main contact 10 to move upward until the upper and lower arcing contacts move to the just-closed state. Figure 2 As shown, at this time, the current flows from the conductive block 19 to the upper contact rod 13, and then to the upper arc contact 4, the lower arc contact 5 and the lower contact rod 6. After that, the lower contact rod 6 continues to move upward, thereby pushing the upper arc contact 4 to move upward, and the upper arc contact 4 drives the upper contact rod 13 to move upward, and then drives the gland 20 to move upward. Under the action of the lever structure 16, the linkage rod 14 moves downward, and drives the upper main contact 3 to move downward. In this process, the reset spring 18 is compressed, and the upper main contact 3 and the lower main contact 10 begin to plug and contact and conduct electricity, until the gland 20 moves to the stop column 21 to stop and cooperate. At this time, the upper main contact 3 and the lower main contact 10 are completely closed, and the conductive circuit is completely connected. At this time, the current flows from the terminal block 24 to the cylinder 17, and then to the conductive tube 2, the upper main contact 3, the lower main contact 10 and the lower contact rod 6.

[0077] During the opening process, under the action of the reset spring 18, the upper arc contact 4 and the upper contact rod 13 move downward, and under the action of the lever structure 16, the linkage rod 14 drives the upper main contact 3 to move upward until the upper and lower main contacts are completely separated, the conductive circuit is disconnected, and the upper and lower arc contacts are subsequently separated, and the upper and lower contacts return to the opening state.

[0078] When the vacuum interrupter of the present invention is in the open state, the lower end surface of the upper main contact 3 is higher than the lower end surface of the upper arc contact 4, that is, the lower end surface of the upper main contact 3 and the lower end surface of the upper arc contact 4 are offset in the up-down direction, and the lower end surface of the upper main contact 3 is arranged away from the lower end surface of the upper arc contact 4; at the same time, the upper end surface of the lower arc contact 5 is higher than the upper end surface of the lower main contact 10, that is, the upper end surface of the lower arc contact 5 and the upper end surface of the lower main contact 10 are also offset in the up-down direction. In this way, during the opening and closing process, the arc generated between the upper arc contact 4 and the lower arc contact 5 is difficult to transfer to the upper main contact 3 and the lower main contact 10, thereby reducing the ablation of the upper main contact 3 and the lower main contact 10, and protecting the main contacts.

[0079] At the same time, since a lever linkage mechanism is arranged between the upper main contact 3 and the upper contact rod 13, the lever in the lever linkage mechanism plays a reversing role, which can drive the upper main contact 3 to move in the opposite direction synchronously when the upper contact rod 13 moves up and down. That is, when closing the circuit, when the upper contact rod 13 moves upward under the push of the lower contact rod 6, the upper main contact 3 moves downward synchronously, so that it can quickly contact the lower main contact 10, thus saving the upward movement stroke of the lower contact rod 6. Therefore, it can not only shorten the closing time, but also reduce the longitudinal size of the vacuum arc extinguishing chamber, and at the same time reduce the requirements for the output stroke of the operating mechanism.

[0080] Conversely, when opening the switch, the upper contact rod 13 moves downward to reset under the action of the reset spring 18, and the upper main contact 3 moves upward under the action of the lever linkage mechanism, so that it can quickly separate from the lower main contact 10, saving the downward movement of the lower contact rod 6, and also shortening the opening time. In addition, during the upward movement of the upper main contact 3, the lower end surface of the upper main contact 3 and the lower end surface of the upper arc contact 4 are quickly pulled apart in the vertical direction, so that at the moment when the upper arc contact 4 and the lower arc contact 5 are separated, the lower end surface of the upper main contact 3 has moved to the upper side of the lower end surface of the upper arc contact 4, so that the arc generated between the upper arc contact 4 and the lower arc contact 5 is not easily transferred to the upper main contact 3, prolonging the time for the arc to spread to the upper main contact 3, and reducing the ablation of the upper main contact 3.

[0081] In addition, since the lower arc contact 5 and the upper arc contact 4 are in butt contact, after the lower arc contact 5 contacts the upper arc contact 4, the lower arc contact 5 can push the upper arc contact 4 to continue to move upward, so that the reset spring 18 is deformed by force, and provides reset power for the downward movement of the upper contact rod 13. The lower main contact 10 and the upper main contact 3 are in plug-in contact, and the plug-in contact relies on the contact and conduction between the inner hole and the outer wall, and does not need to apply a joint pressure in the up and down directions. Therefore, compared with the prior art, the main contact spring outside the moving end of the arc extinguishing chamber can be omitted, thereby simplifying the outer structure of the arc extinguishing chamber. At the same time, since the operating mechanism does not need to compress the main contact spring, the operating work can be reduced.

[0082] Embodiment 2 of the vacuum interrupter of the present invention is as follows Figure 5 , Figure 6 and Figure 7 As shown, the main difference between this embodiment and embodiment 1 is that an upper insulating ring 25 is fixed on the outer wall of the conductive tube 2, and a stopper 26 is fixedly arranged on the inner side of the upper main contact 3. Figure 8 As shown, in the open state, the upper end of the upper main contact 3 is in contact with the upper insulating ring 25, that is, the upper main contact 3 and the outer wall of the conductive tube 2 are temporarily not conductive.

[0083] In addition, the lower main contact 10 and the lower contact rod 6 in this embodiment are in sliding contact and conductive cooperation. A boss 61 is provided on the lower contact rod 6, and a compression spring 27 is sleeved on the outer side of the lower contact rod 6. The upper end of the compression spring 27 presses on the lower main contact 10, and the lower end presses on the boss 61, and the lower end of the compression spring 27 is combined with the boss 61. Fig. 9 As shown, a lower insulating ring 28 is fixed on the lower contact rod 6. In the open state, the lower main contact 10 contacts the lower insulating ring 28, that is, the lower main contact 10 and the lower contact rod 6 are temporarily disconnected.

[0084] The working principle of this embodiment is basically the same as that of the first embodiment, except that, due to the arrangement of the upper insulating ring 25, the lower insulating ring 28 and the stop cylinder 26, the lower main contact 10 will contact the stop cylinder 26 during the upward movement, and then the lower main contact 10 cannot move upward, but the lower contact rod 6 still moves upward, so that the lower main contact 10 moves downward relative to the lower contact rod 6 until it passes over the position of the lower insulating ring 28, and then it can be connected with the lower contact rod 6. Similarly, the upper main contact 3 also needs to pass over the upper insulating ring 25 during the downward movement to be connected with the conductive tube 2. Therefore, the upper main contact and the lower main contact in this embodiment will be connected with the main circuit after a period of time after the engagement, and will be disconnected from the main circuit before separation, which further avoids contact ablation caused by arc current transfer.

[0085] In other embodiments of the vacuum arc extinguishing chamber, the fixing plate and the stop column may not be provided in the cylinder. In this case, the reset spring may be connected between the pressure cover and the bottom wall of the cylinder, and the reset spring provides reset power through tensile deformation, or the reset spring may be provided in the shell, for example, between the conductive tube and the upper arc contact.

[0086] In other embodiments of the vacuum interrupter, the pressure cover does not need to cooperate with the guide of the conductive block, and the pressure cover is only arranged above the conductive block.

[0087] In other embodiments of the vacuum arc extinguishing chamber, a transition connecting rod may not be provided between the gland and the lever, and between the linkage rod and the lever. In this case, a long hole structure needs to be provided on the lever to prevent the lever from getting stuck.

[0088] In other embodiments of the vacuum interrupter, the upper end of the upper contact rod may not be provided with a gland, but may be directly connected to the lever structure in transmission.

[0089] In other embodiments of the vacuum interrupter, the conductive block may not be provided in the cylinder, and the upper contact rod may be directly plugged into the conductive tube for conductive contact. In this case, the upper end of the upper contact rod may be directly connected to the lever structure for transmission.

[0090] In other embodiments of the vacuum arc chamber, the lever linkage mechanism may not include the cylinder. In this case, the lever can be rotatably installed on the top of the shell, for example, a mounting rod is fixed on the upper cover plate, and the lever is rotatably installed on the mounting rod. At this time, in order to facilitate the setting of the reset spring, a relatively large spring cover can be fixed on the upper cover plate, and the spring cover encloses the lever structure. The reset spring is arranged in the spring cover, and the upper end of the upper contact rod is pressed into engagement with the reset spring.

[0091] In other embodiments of the vacuum arc chamber, the lever can also be rotatably installed in the shell. In this case, a mounting structure for the lever needs to be fixed on the inner wall of the shell, and a connecting structure connected to the lever structure needs to be provided on the upper contact rod. In this case, if the upper main contact structure is suitable, the linkage rod can be omitted and directly connected to the lever structure.

[0092] In other embodiments of the vacuum interrupter, the conductive tube may not be provided, so that the upper main contact directly contacts and conducts with the outer wall of the upper contact rod in a sliding manner.

[0093] In other embodiments of the vacuum interrupter, the upper main contact can also be arranged on the inner side of the upper arc contact. In this case, the lower main contact is arranged on the inner side of the lower arc contact, and the upper end surface of the lower arc contact is higher than the upper end surface of the lower main contact. In the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact, and the upper arc contact and the lower arc contact still contact before the upper main contact and the lower main contact, and separate after the upper main contact and the lower main contact.

[0094] In other embodiments of the vacuum interrupter, the inner diameter of the lower main contact may be set to be larger than the outer diameter of the upper main contact so that the upper main contact can be inserted into the lower main contact, that is, a socket is provided on the lower main contact.

[0095] In other embodiments of the vacuum interrupter, the upper main contact and the lower main contact may also be arranged to be in abutting contact for electrical conduction, as in the prior art.

[0096] An embodiment of the vacuum circuit breaker in the present invention is as follows: the vacuum circuit breaker includes an operating mechanism and a vacuum interrupter connected to the operating mechanism. The structure of the vacuum interrupter is the same as that of the vacuum interrupter in the above embodiment, and will not be repeated here.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A vacuum interrupter, comprising: case; A lower contact rod, the upper end of which extends into the interior of the housing, and the lower end of which is used for transmission connection with the operating mechanism, so that the lower contact rod can move up and down relative to the housing to realize opening and closing; A lower main contact, arranged at the upper end of the lower contact rod; A lower arcing contact is conductively connected to the lower main contact, and an upper end surface of the lower arcing contact is higher than an upper end surface of the lower main contact; An upper contact rod, the lower end of which extends into the housing, and the upper contact rod is assembled on the housing so as to be movable up and down; A reset spring is used to deform when the upper contact rod moves upward, so as to provide a reset force for the upper contact rod to move downward; An upper arc contact is arranged at the lower end of the upper contact rod; An upper main contact, conductively connected to the upper arcing contact; The invention is characterized in that: in the open state, the lower end surface of the upper main contact is higher than the lower end surface of the upper arc contact; a lever linkage mechanism is arranged between the upper main contact and the upper contact rod, and the lever linkage mechanism comprises a lever, one end of the lever is transmission-connected with the upper main contact, and the other end of the lever is transmission-connected with the upper contact rod, so that when the upper contact rod moves up and down, the upper main contact is driven to move in the opposite direction synchronously through the lever linkage mechanism; the upper main contact is arranged on the outer side of the upper arc contact; an upper cover plate is arranged on the upper end of the shell, and a conductive tube extending up and down and with the lower end extending into the shell is fixed on the upper cover plate, and the upper main contact is arranged The upper contact rod penetrates the conductive tube up and down on the outside of the conductive tube and is in sliding contact with the outer wall of the conductive tube for conductive cooperation; the lever linkage mechanism also includes a cylinder body arranged above the shell, the cylinder body has a cylinder body bottom wall and a cylinder body side wall, the cylinder body bottom wall is fixedly connected to the top end of the conductive tube, the top end of the upper contact rod extends into the cylinder body, the lever is rotatably installed in the cylinder body, the lever linkage mechanism also includes a linkage rod with one end connected to the upper main contact and the other end passing through the upper cover plate and the cylinder bottom wall and extending into the cylinder body, one end of the lever is transmission connected to the linkage rod, and the other end of the lever is transmission connected to the upper contact rod.

2. The vacuum interrupter according to claim 1, characterized in that: The upper contact rod and the conductive tube are gap-matched, a conductive block is fixed on the bottom wall of the cylinder, the upper end of the upper contact rod passes through the conductive block, the upper contact rod and the conductive block are plug-connected and conductively matched, and the conductive block is conductively connected to the conductive tube through the bottom wall of the cylinder.

3. The vacuum interrupter according to claim 2, characterized in that: The upper end of the upper contact rod is connected with a pressure cover, and the pressure cover is transmission connected with the lever.

4. The vacuum interrupter according to claim 3, characterized in that: Transition connecting rods are respectively connected between the pressure cover and the lever, and between the linkage rod and the lever.

5. The vacuum interrupter according to claim 3 or 4, characterized in that: The pressure cover is sleeved on the outside of the conductive block, and the pressure cover and the conductive block are guided and slidably matched in the up and down directions.

6. The vacuum interrupter according to claim 3 or 4, characterized in that: A fixing plate is fixedly arranged in the cylinder, and the fixing plate is located above the pressure cover. A stop column extending downward is fixed on the fixing plate, and the lower end surface of the stop column is used to cooperate with the upper end surface of the pressure cover when closing the switch. The reset spring is sleeved on the stop column, and one end of the reset spring presses on the fixing plate and the other end presses on the pressure cover.

7. A vacuum circuit breaker, comprising an operating mechanism and a vacuum interrupter connected to the operating mechanism, characterized in that: The vacuum interrupter is the same as the vacuum interrupter described in any one of claims 1 to 6 above.

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