Opening and closing unit for closing resistor and circuit breaker

Abstract

The utility model belongs to the technical field of metal-enclosed switch equipment, and discloses an opening and closing unit for a closing resistor and a circuit breaker. The opening and closing unit for the closing resistor comprises a static contact and a moving contact, the static contact is connected to the insulating sleeve, the moving contact is arranged in the insulating sleeve in a sliding mode, the moving contact can make contact with the static contact for closing or break away from the static contact for opening, the moving contact is sleeved with an elastic piece, and the elastic piece is limited between the moving contact and the insulating sleeve in the radial direction of the insulating sleeve. And a guide piece is arranged between at least one end of the moving contact and the insulating sleeve along the radial direction of the insulating sleeve. According to the switching-on and switching-off unit for the switching-on resistor, the guide piece ensures that the moving contact does not deviate in position when moving on the X axis, so that the elastic piece is prevented from deviating in position, the elastic piece can be prevented from being rubbed with the inner wall of the insulating sleeve in the switching-on and switching-off process, and the phenomenon of bouncing in the switching-on and switching-off process is ensured not to occur.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metal closed switch equipment especially relates to closing resistance uses switching unit and circuit breaker. BACKGROUND

[0002] In the switching unit for closing resistance of circuit breaker, mainly including moving contact and static contact, static contact is connected to one end of insulating sleeve and partly extends into insulating sleeve, reset spring is sleeved on moving contact and contacts the inner wall surface of insulating sleeve, reset spring is respectively abutted on moving contact and insulating sleeve along the opposite ends on X axis, and moving contact is slidably arranged in insulating sleeve along X axis, so that moving contact and static contact can be contacted or separated by reciprocating movement of moving contact along X axis, thereby realizing closing and opening of circuit breaker.

[0003] However, in the opening and closing process, due to the fast moving speed of moving contact, the position of moving contact in the insulating sleeve is easy to deviate, so that the position of reset spring is also easy to deviate, resulting in friction and scratching between reset spring and the inner wall of insulating sleeve, and the bouncing phenomenon occurs in the opening and closing process, which cannot guarantee the stability and reliability of the switching unit for closing resistance and the entire circuit breaker.

[0004] Therefore, there is an urgent need for a switching unit for closing resistance and a circuit breaker to solve the above problems. INVENTION CONTENTS

[0005] The utility model aims at providing a switching unit for closing resistance and a circuit breaker, which can avoid friction and scratching between the elastic member and the inner wall of the insulating sleeve, and can also guarantee that no bouncing phenomenon occurs in the opening and closing process.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The switching unit for closing resistance comprises:

[0008] Static contact and moving contact, the static contact is connected to the insulating sleeve, the moving contact is slidably arranged in the insulating sleeve, the moving contact can be contacted and closed or separated and opened with the static contact, an elastic member is sleeved on the moving contact, the elastic member is limited between the moving contact and the insulating sleeve along the radial direction of the insulating sleeve, and a guide member is arranged between at least one end of the moving contact and the insulating sleeve along the radial direction of the insulating sleeve.

[0009] As an option, an inner wall surface of the insulating sleeve is provided with a first groove, the guide member comprises a first guide ring, the first guide ring is located at one end of the movable contact close to the static contact, an outer side of the first guide ring is clamped in the first groove, an inner side of the first guide ring is in contact with an outer peripheral surface of the movable contact, the movable contact can slide along the X axis relative to the first guide ring, and the first guide ring is located at one side of the elastic member along the X axis.

[0010] As an option, one end of the movable contact away from the static contact is connected with a connecting member, the connecting member is used for connecting a transmission structure, and the transmission structure is used for driving the movable contact to slide in the insulating sleeve.

[0011] As an option, an outer peripheral surface of the connecting member is provided with a second groove, the guide member comprises a second guide ring, an inner side of the second guide ring is clamped in the second groove, an outer side of the second guide ring is in contact with an inner wall surface of the insulating sleeve, the second guide ring can slide relative to the insulating sleeve, and the second guide ring is located at the other side of the elastic member along the X axis.

[0012] As an option, the insulating sleeve comprises:

[0013] a first flange, a support cylinder and a second flange, the first flange is provided with an exhaust hole, opposite ends of the support cylinder along the X axis are connected with the first flange and the second flange respectively, the guide member is located in the first flange, an inner wall surface of the first flange is provided with a third groove, a watchband contact finger is arranged in the third groove, the watchband contact finger is in contact with an outer peripheral surface of the movable contact, and opposite ends of the elastic member along the X axis abut against the connecting member and the first flange respectively.

[0014] As an option, an outer side wall of the connecting member is formed with a first resisting end face in the circumferential direction, an inner side wall of the first flange is formed with a second resisting end face in the circumferential direction, the first resisting end face and the second resisting end face are arranged opposite to each other along the X axis, and two ends of the elastic member abut against the first resisting end face and the second resisting end face respectively.

[0015] As an option, the inner side wall of the first flange is further formed with a first limiting face in the circumferential direction, the first limiting face is connected perpendicularly with the second resisting end face, an outer peripheral surface of one end of the movable contact connected with the connecting member is formed with a second limiting face, one end of the elastic member is abutted between the first limiting face and the outer side wall of the movable contact, and the other end of the elastic member is abutted between the second limiting face and the inner side wall of the first flange.

[0016] As an option, the inner side wall of the first flange is further formed with a guide inclined surface which gradually approaches the axial inclined arrangement of the insulating sleeve along the direction of the X axis and close to the support cylinder, and the first limiting surface is connected to the guide inclined surface and the second resisting end surface.

[0017] As an option, the insulating sleeve further comprises:

[0018] A first support ring and a second support ring, the first support ring is arranged in the portion of the support cylinder located in the first flange, the second support ring is arranged in the portion of the support cylinder located in the second flange, and the first support ring, the first flange and the support cylinder are connected by a first fastener, and the second support ring, the second flange and the support cylinder are connected by a second fastener.

[0019] The circuit breaker comprises an operating mechanism and the closing resistance opening and closing unit as described above, and the operating mechanism is used to drive the moving contact to slide along the X axis.

[0020] Advantages:

[0021] The closing resistance opening and closing unit provided by the utility model, by connecting the static contact to the insulating sleeve and slidingly arranging the moving contact in the insulating sleeve, the moving contact can be in contact with the static contact to close or separated from the static contact to open; meanwhile, the elastic member is sleeved on the moving contact and is limited between the moving contact and the insulating sleeve along the radial direction of the insulating sleeve, so that the elastic member can be provided with the limiting action along the radial direction of the insulating sleeve; and the guide member is arranged between at least one end of the moving contact and the insulating sleeve, so that the guide member can provide the guide action for the sliding of the moving contact along the X axis in the insulating sleeve, the movement of the moving contact along the X axis will not be deviated, the position deviation of the elastic member can be avoided, the friction and scratching between the elastic member and the inner wall of the insulating sleeve can be avoided, and the bouncing phenomenon in the opening and closing process can be avoided, so that the stability and reliability of the closing resistance opening and closing unit and the whole circuit breaker can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the circuit breaker provided in the utility model;

[0023] Figure 2 is a front view of the closing resistance opening and closing unit provided in the utility model;

[0024] Figure 3 is a sectional view of the closing resistance opening and closing unit (when opening) provided in the utility model Figure 1 ;

[0025] Figure 4 isFigure 3 Partial enlarged structure schematic view of B in the middle;

[0026] Figure 5 is the sectional view of the closing resistance closing and opening unit (when closing) provided in the utility model Figure 2

[0027] Figure 6 is the sectional view of the insulating sleeve provided in the utility model

[0028] Figure 7 is Figure 6 Partial enlarged structure schematic view of A in the middle;

[0029] Figure 8 is the sectional view of the connecting piece (provided with the second guide ring) provided in the utility model.

[0030] In the figure:

[0031] 10, closing resistance closing and opening unit; 20, operating mechanism;

[0032] 11, insulating sleeve; 111, first flange; 1111, exhaust hole; 1112, first annular protrusion; 1113, first groove; 1114, third groove; 1115, second resisting end face; 1116, first limiting surface; 1117, guide inclined surface; 112, supporting cylinder; 113, second flange; 114, first supporting ring; 115, second supporting ring; 116, first fastener; 117, second fastener; 12, guide piece; 121, first guide ring; 122, second guide ring;

[0033] 21, connecting piece; 211, second annular protrusion; 212, first resisting end face; 22, moving contact; 221, moving main contact; 222, moving arc contact; 223, second limiting surface; 224, plug-in hole; 23, elastic piece; 24, static contact; 241, static main contact; 242, static arc contact; 25, watchband contact finger. DETAILED DESCRIPTION

[0034] The utility model will be further explained in detail below by combining with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0035] ​In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or into an organic whole, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0037] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0038] As Figure 1 And Figure 2 As shown in the embodiment, a closing resistor split closing unit 10 and a circuit breaker comprising the closing resistor split closing unit 10 are provided, the circuit breaker is applied to a gas insulated metal enclosed switchgear, and the circuit breaker further comprises an operating mechanism 20 connected with the closing resistor split closing unit 10 to drive the closing resistor split closing unit 10 to move. The operating mechanism 20 is a common operating structure in the existing circuit breaker, and the specific structure and working principle of the operating mechanism 20 will not be described in detail here.

[0039] Specifically, as Figures 1 to 5As shown, the closing resistor opening and closing unit 10 includes a static contact 24 and a dynamic contact 22, the static contact 24 is connected to the insulating sleeve 11, the dynamic contact 22 is slidingly arranged in the insulating sleeve 11 along the X axis, the dynamic contact 22 can be in contact with the static contact 24 to close or be separated from the static contact 24 to open; an elastic member 23 is sleeved on the dynamic contact 22, the elastic member 23 is limited between the dynamic contact 22 and the insulating sleeve 11 along the radial direction of the insulating sleeve 11, and a guide member 12 is arranged between at least one end of the dynamic contact 22 and the insulating sleeve 11 along the radial direction of the insulating sleeve 11. In the embodiment, the elastic member 23 can be a return spring. The X axis is parallel to the axial direction of the insulating sleeve 11.

[0040] By slidingly arranging the dynamic contact 22 in the insulating sleeve 11 along the X axis, sleeving the elastic member 23 on the dynamic contact 22, and limiting the elastic member 23 between the dynamic contact 22 and the insulating sleeve 11 along the radial direction of the insulating sleeve 11, the elastic member 23 can be provided with a limiting action along the radial direction of the insulating sleeve 11.

[0041] Compared with the prior art, the closing resistor opening and closing unit 10 in the embodiment can provide a guiding action for the sliding of the dynamic contact 22 in the insulating sleeve along the X axis through the guide member 12 arranged between at least one end of the dynamic contact 22 and the insulating sleeve 11, so that the movement of the dynamic contact 22 along the X axis will not be deviated, thereby avoiding the position deviation of the elastic member 23, avoiding the friction and scratching between the elastic member 23 and the inner wall of the insulating sleeve 11, and further avoiding the bouncing phenomenon in the opening and closing process, so as to improve the stability and reliability of the closing resistor opening and closing unit 10 and the whole circuit breaker. The bouncing phenomenon specifically refers to the phenomenon that the circuit breaker will be closed and tripped repeatedly, and the repeated action is called bouncing phenomenon.

[0042] Further, as shown in Figures 3 to 7 , a first groove 1113 is annularly arranged on the inner wall surface of the insulating sleeve 11; the guide member 12 includes a first guide ring 121, the first guide ring 121 is located at one end of the dynamic contact 22 close to the static contact 24, the outer side of the first guide ring 121 is clamped in the first groove 1113, the inner side of the first guide ring 121 is in contact with the outer peripheral surface of the dynamic contact 22, and the dynamic contact 22 can slide along the X axis relative to the first guide ring 121, and the first guide ring 121 is located on one side of the elastic member 23 along the X axis.

[0043] Specifically, as shown in Figure 3 , Figure 5 , and Figure 8 , one end of the dynamic contact 22 away from the static contact 24 is connected with a connecting member 21, the connecting member 21 is used for connecting a transmission structure, and the transmission structure is used for driving the dynamic contact 22 to slide in the insulating sleeve 11. The transmission structure is specifically a common transmission structure in the existing circuit breaker.

[0044] Specifically, as shown in Figures 1 to 3 , the operating mechanism 20 is connected with the connecting piece 21, so that the operating mechanism 20 drives the connecting piece 21 to move along the X axis, thereby driving the connecting piece 21 to drive the movable contact 22 to slide along the X axis in the insulating sleeve 11. In the embodiment, the connecting piece 21 is a connecting head structure commonly used in existing circuit breakers.

[0045] Specifically, as shown in Figure 3 , Figure 5 and Figure 8 , a second groove is arranged around the outer circumferential surface of the connecting piece 21; the guide 12 comprises a second guide ring 122, the inner side of the second guide ring 122 is clamped in the second groove, the outer side of the second guide ring 122 is in contact with the inner wall surface of the insulating sleeve 11, and the second guide ring 122 can slide along the X axis relative to the insulating sleeve 11, and the second guide ring 122 is located on the other side of the elastic piece 23 along the X axis.

[0046] As shown in Figure 3 and Figure 5 , by setting the first guide ring 121 and the second guide ring 122 cooperating with each other, a more stable guiding effect can be provided for the sliding of the movable contact 22 along the X axis, and the positions of the movable contact 22 and the elastic piece 23 can be better ensured not to deviate; and by locating the first guide ring 121 on one side of the elastic piece 23 along the X axis and locating the second guide ring 122 on the other side of the elastic piece 23 along the X axis, the guiding effect of the first guide ring 121 and the second guide ring 122 located on the opposite sides of the elastic piece 23 along the X axis can be used to more stably ensure that the position of the elastic piece 23 does not deviate.

[0047] Further, as shown in Figures 3 to 7 , the insulating sleeve 11 comprises a first flange 111, a support cylinder 112 and a second flange 113, the support cylinder 112 is connected with the first flange 111 and the second flange 113 at opposite ends along the X axis, the first guide ring 121 and the second guide ring 122 are located in the first flange 111, the inner wall surface of the first flange 111 is arranged with a third groove 1114, a watchband contact finger 25 is arranged in the third groove 1114, and the watchband contact finger 25 is in contact with the outer circumferential surface of the movable contact 22; the opposite ends of the elastic piece 23 along the X axis abut against the connecting piece 21 and the first flange 111 respectively, so as to provide a limiting effect along the axial direction of the insulating sleeve 11 for the elastic piece 23. The watchband contact finger 25, as a kind of conductive medium, is a specially shaped elastic connecting element, which can significantly improve the quality of electrical connection and energy transmission.

[0048] As shown in Figures 3 to 5As shown, the electric connection between the first flange 111 and the moving contact 22 is realized through the watchband contact finger 25, so that the conduction between the entire insulating sleeve 11 and the moving contact 22 can be ensured; and the watchband contact finger 25 and the third groove 1114 are respectively provided in plurality, one watchband contact finger 25 is limitedly connected in one third groove 1114, so that the stability and reliability of the conduction between the insulating sleeve 11 and the moving contact 22 can be better ensured. In the embodiment, the number of the watchband contact finger 25 and the third groove 1114 is respectively two, and the specific number of the watchband contact finger 25 and the third groove 1114 is not limited here.

[0049] Specifically, as shown in Figures 3 to 7 The first groove 1113 is arranged on the inner wall surface of the first flange 111, and the first groove 1113 is located on one side of the third groove 1114 along the X axis, so that the first guide ring 121 and the watchband contact finger 25 do not interfere with each other.

[0050] Specifically, as shown in Figures 3 to 8 The first annular protrusion 1112 is arranged on the inner wall surface of the first flange 111, and the first groove 1113 and the third groove 1114 are arranged on the inner wall surface of the first annular protrusion 1112; and the second annular protrusion 211 is arranged on the outer peripheral surface of the connecting piece 21, and the second groove is arranged on the outer peripheral surface of the second annular protrusion 211. One end of the connecting piece 21 extends into the moving contact 22 along the X axis and is threadedly connected with the moving contact 22, and the end of the moving contact 22 abuts against the first side surface of the second annular protrusion 211.

[0051] Specifically, as shown in Figure 2 , Figure 3 and Figure 6 The exhaust hole 1111 is arranged on the first flange 111, so that the gas in the insulating sleeve 11 can be exhausted through the exhaust hole 1111, and the problem that the insulating sleeve 11 becomes a vacuum state or has too much gas can be avoided, so that the breaking performance of the circuit breaker can be better ensured. The number of the exhaust hole 1111 can be provided in plurality, and the diameters of the plurality of exhaust holes 1111 can be the same or different, which is not limited here.

[0052] Further, as shown in Figures 3 to 8As shown, the outer side wall of the connecting piece 21 is formed with a first resisting end face 212 in the circumferential direction, that is, the first side face abutting against the end of the movable contact 22 is the first resisting end face 212, that is, one end of the elastic member 23 abuts against a part of the first side face, and the end of the movable contact 22 abuts against another part of the first side face; the inner side wall of the first flange 111 is formed with a second resisting end face 1115 in the circumferential direction, that is, the second side face of the first annular protrusion 1112 close to the connecting piece 21 is the second resisting end face 1115, the first resisting end face 212 and the second resisting end face 1115 are oppositely arranged along the X axis, and the two ends of the elastic member 23 abut against the first resisting end face 212 and the second resisting end face 1115 respectively, so as to provide the elastic member 23 with a limiting effect along the axial direction of the insulating sleeve 11.

[0053] Further, as shown in the drawings, Figures 3 to 7 the inner side wall of the first flange 111 is further formed with a first limiting face 1116 in the circumferential direction, the first limiting face 1116 is perpendicularly connected with the second resisting end face 1115, the outer peripheral surface of the end of the movable contact 22 connected with the connecting piece 21 is formed with a second limiting face 223, one end of the elastic member 23 abuts between the first limiting face 1116 and the outer side wall of the movable contact 22, and the other end of the elastic member 23 abuts between the second limiting face 223 and the inner side wall of the first flange 111, so as to provide the elastic member 23 with a limiting effect along the radial direction of the insulating sleeve 11.

[0054] Specifically, as shown in the drawings, Figures 3 to 7 the inner side wall of the first flange 111 is further formed with a guide inclined face 1117 in the circumferential direction, the guide inclined face 1117 is gradually arranged in the axial direction of the insulating sleeve 11 along the X axis and close to the support cylinder 112, and the first limiting face 1116 is connected with the guide inclined face 1117 and the second resisting end face 1115.

[0055] By arranging the guide inclined face 1117, on the one hand, the elastic member 23 can be more smoothly introduced into the first limiting face 1116 through the guiding effect of the guide inclined face 1117, and the elastic member 23 will not be stuck; on the other hand, the position deviation of the elastic member 23 can be avoided through the blocking effect of the guide inclined face 1117, so that the position deviation of the elastic member 23 can be better avoided.

[0056] Specifically, as shown in the drawings, Figures 3 to 7As shown, the insulation sleeve 11 further comprises a first support ring 114 and a second support ring 115, the first support ring 114 is arranged in the portion of the support cylinder 112 located in the first flange 111, and the second support ring 115 is arranged in the portion of the support cylinder 112 located in the second flange 113, so that the support cylinder 112 can be better supported by the first support ring 114 and the second support ring 115, and the connection between the support cylinder 112 and the first flange 111 and the second flange 113 is more stable and firm, thereby improving the anti-deformation ability of the entire insulation sleeve 11.

[0057] Further, as shown in Figure 6 , the first support ring 114, the first flange 111 and the support cylinder 112 are connected by the first fastener 116, and the second support ring 115, the second flange 113 and the support cylinder 112 are connected by the second fastener 117, so that the first flange 111, the first support ring 114, the support cylinder 112, the second support ring 115 and the second flange 113 can be electrically connected to each other while being stably connected by the first fastener 116 and the second fastener 117, thereby realizing the equipotential of the entire insulation sleeve 11 and reducing the discharge risk of the insulation sleeve 11. The first fastener 116 and the second fastener 117 can be elastic pins or screws, and the structures of the first fastener 116 and the second fastener 117 can be the same or different, which are not limited here as long as they can realize stable connection and electrical connection.

[0058] Specifically, as shown in Figure 3 and Figure 5 , the contact assembly further comprises a static contact 24, one end of the static contact 24 is connected to the end of the second flange 113 away from the support cylinder 112, and the other end of the static contact 24 is located in the second flange 113, so that the static contact 24 can contact or separate from the moving contact 22, thereby realizing the closing and opening of the circuit breaker.

[0059] Specifically, as shown in Figure 3 and Figure 5As shown, the stationary contact 24 includes a threaded stationary arc contact 242 and a stationary main contact 241. One end of the stationary main contact 241 is bolted to the end of the second flange 113 away from the support cylinder 112. The other ends of the stationary arc contact 242 and the stationary main contact 241 are located inside the second flange 113. Correspondingly, the moving contact 22 includes a fixedly connected moving arc contact 222 and a moving main contact 221. The moving main contact 221 is slidably disposed within the first flange 111 along the X-axis. That is, the moving contact 22 mentioned above basically refers to the moving main contact 221. The moving arc contact 222 protrudes from one end of the moving main contact 221 along the X-axis, and a insertion hole 224 is provided in the moving arc contact 222 so that the stationary main contact 241 can be inserted into the insertion hole 224. At the same time, the stationary arc contact 242 contacts the moving main contact 221, thereby realizing the contact and closing between the stationary contact 24 and the moving contact 22. The working principles of the stationary contact 24 and the moving contact 22 can be referred to the working principles of existing circuit breakers, and will not be described in detail here.

[0060] The specific working process of the closing resistor using the opening and closing unit 10 in this embodiment is as follows:

[0061] First, such as Figure 3 As shown, the initial position of the moving contact 22 is the open position, that is, the moving contact 22 is disengaged from the stationary contact 24. The operating mechanism 20 drives the connecting member 21 to move, causing the moving contact 22 to move along the Z-axis towards the stationary contact 24. During this process, as the moving contact 22 contacts the stationary contact 24 to enter the closed position, gas is discharged from the first flange 111 through the exhaust port 1111. Simultaneously, the connecting member 21 compresses the elastic member 23, causing the elastic member 23 to store elastic potential energy, thereby achieving the closing of the circuit breaker. Figure 5 As shown.

[0062] Then, during the tripping process, since there is no driving force from the operating mechanism 20, the elastic element 23 automatically moves along the X-axis away from the stationary contact 24 under its own elastic force. This pushes the connecting element 21 and the moving contact 22 to automatically move away from the stationary contact 24 along the X-axis, causing the moving contact 22 to disengage from the stationary contact 24, thus achieving the tripping of the circuit breaker. Figure 3 As shown.

[0063] During the aforementioned closing and opening processes, the limiting effect of the guide inclined surface 1117, the first limiting surface 1116, the second limiting surface 223, the first abutting end surface 212, and the second abutting end surface 1115 on the elastic element 23, the linear sliding of the second guide ring 122 along the inner wall surface of the first flange 111, and the sliding cooperation between the first guide ring 121 and the outer peripheral surface of the moving contact 22 reduce the stability impact of the elastic element 23 caused by compression or energy release, thereby ensuring that the position of the elastic element 23 will not shift, thus making the circuit breaker's working stability and reliability high.

[0064] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A closing resistor for a switching unit, characterized in that, include: A stationary contact (24) and a moving contact (22) are provided. The stationary contact (24) is connected to an insulating sleeve (11). The moving contact (22) is slidably disposed inside the insulating sleeve (11). The moving contact (22) can contact the stationary contact (24) to close or disengage from the stationary contact to open. An elastic element (23) is sleeved on the moving contact (22). The elastic element (23) is located radially between the moving contact (22) and the insulating sleeve (11). A guide element (12) is provided between at least one end of the moving contact (22) and the insulating sleeve (11) radially.

2. The closing resistor opening and closing unit according to claim 1, characterized in that, The inner wall of the insulating sleeve (11) is provided with a first groove (1113). The guide member (12) includes a first guide ring (121). The first guide ring (121) is located at one end of the moving contact (22) near the stationary contact (24). The outer side of the first guide ring (121) is engaged in the first groove (1113). The inner side of the first guide ring (121) is in contact with the outer peripheral surface of the moving contact (22). The moving contact (22) can slide relative to the first guide ring (121) along the X-axis. The first guide ring (121) is located on one side of the elastic member (23) along the X-axis.

3. The closing resistor opening and closing unit according to claim 1, characterized in that, The moving contact (22) is connected to a connector (21) at the end away from the stationary contact (24). The connector (21) is used to connect to a transmission structure, which is used to drive the moving contact (22) to slide inside the insulating sleeve (11).

4. The closing resistor opening and closing unit according to claim 3, characterized in that, The outer circumferential surface of the connector (21) is provided with a second groove. The guide (12) includes a second guide ring (122). The inner side of the second guide ring (122) is engaged in the second groove. The outer side of the second guide ring (122) is in contact with the inner wall surface of the insulating sleeve (11). The second guide ring (122) can slide relative to the insulating sleeve (11). The second guide ring (122) is located on the other side of the elastic member (23) along the X-axis.

5. The closing resistor opening and closing unit according to claim 3 or 4, characterized in that, The insulating sleeve (11) includes: The first flange (111), the support cylinder (112), and the second flange (113) are provided. The first flange (111) is provided with an exhaust hole (1111). The support cylinder (112) is connected to the first flange (111) and the second flange (113) at opposite ends along the X-axis, respectively. The guide (12) is located inside the first flange (111). The inner wall surface of the first flange (111) is provided with a third groove (1114). The third groove (1114) is provided with a watch strap finger (25), and the watch strap finger (25) is in contact with the outer peripheral surface of the moving contact (22). The elastic element (23) abuts against the connector (21) and the first flange (111) at opposite ends along the X-axis, respectively.

6. The closing resistor opening and closing unit according to claim 5, characterized in that, The outer sidewall of the connector (21) is formed with a first abutting end face (212) in the circumferential direction, and the inner sidewall of the first flange (111) is formed with a second abutting end face (1115) in the circumferential direction. The first abutting end face (212) and the second abutting end face (1115) are arranged opposite to each other along the X-axis. The two ends of the elastic member (23) abut against the first abutting end face (212) and the second abutting end face (1115) respectively.

7. The closing resistor opening and closing unit according to claim 6, characterized in that, The inner wall of the first flange (111) is also formed with a first limiting surface (1116) along the circumferential direction. The first limiting surface (1116) is perpendicularly connected to the second abutting end face (1115). The outer peripheral surface of the end of the moving contact (22) connected to the connecting member (21) is formed with a second limiting surface (223). One end of the elastic member (23) abuts between the first limiting surface (1116) and the outer wall of the moving contact (22), and the other end of the elastic member (23) abuts between the second limiting surface (223) and the inner wall of the first flange (111).

8. The closing resistor opening and closing unit according to claim 7, characterized in that, The inner wall of the first flange (111) is also formed with a guide inclined surface (1117) along the circumferential direction. Along the X-axis and in the direction close to the support cylinder (112), the guide inclined surface (1117) is gradually inclined towards the axial direction of the insulating sleeve (11). The first limiting surface (1116) is connected to the guide inclined surface (1117) and the second abutting end surface (1115).

9. The closing resistor opening and closing unit according to claim 5, characterized in that, The insulating sleeve (11) also includes: A first support ring (114) and a second support ring (115) are provided. The first support ring (114) is supported in the portion of the support cylinder (112) located inside the first flange (111), and the second support ring (115) is supported in the portion of the support cylinder (112) located inside the second flange (113). The first support ring (114), the first flange (111), and the support cylinder (112) are connected by a first fastener (116), and the second support ring (115), the second flange (113), and the support cylinder (112) are connected by a second fastener (117).

10. A circuit breaker, characterized in that, It includes an operating mechanism (20) and a closing and opening unit for a closing resistor as described in any one of claims 1-9, wherein the operating mechanism (20) is used to drive the moving contact (22) to slide along the X-axis.

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