Moving contact and circuit breaker

Abstract

The present invention provides a moving contact and a circuit breaker, belonging to the field of low-voltage electrical appliance technology, comprising a moving contact body, wherein an axial hole is provided in the middle of the moving contact body, the axial hole comprising a first hole position in an open state and a second hole position in a closed state, the first hole position being connected to the second hole position, and the upper limit wall and the lower limit wall of the first hole position being respectively located on the same straight segment or arc segment, the shape of the straight segment or arc segment and the inclination direction and angle of the bottom portion which is inclined relative to the circuit breaker in the use state being adapted to the closing trajectory of one end of the linkage between the moving contact and the tripping system. The present invention provides a moving contact and a circuit breaker thereof which are simple to modify and have excellent use effects, and which adapts the moving contact to the closing trajectory of the tripping mechanism by adjusting the motion trajectory of the rotating fulcrum of the moving contact, thereby maintaining the stability of the moving contact and the static contact, and rapid opening and closing over a short distance, thereby achieving the purpose of reducing contact damage and improving use performance and service life.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to a moving contact and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal or abnormal circuit conditions. The contact system is a key component of a switching device and directly impacts the performance and lifespan of the circuit breaker. The contacts consist of a fixed static contact and a moving contact that moves relative to the static contact. Conventional contacts have a long, axial hole on the moving contact to ensure adequate overtravel. When the moving contact is actuated, one end is controlled by the tripping system, using the rotating shaft on the axial hole as a fulcrum to move the other end closer to or further away from the static contact.

[0003] Since an arc will be generated between the moving contact and the static contact when the circuit breaker is opened, which will continuously burn the contact parts of the static contact and the moving contact, resulting in a decrease in the service life of the contacts, how to improve the materials of the moving contact and the static contact is the current mainstream research and development direction.

[0004] However, after numerous tests, the inventors discovered that, during the closing process, the movable and stationary contacts of this long, waist-shaped shaft hole structure initially locked their contact position at the upper half of the stationary contact. As the handle rotated, the movable contact gradually slid down within the shaft hole, ultimately locking its contact position at the middle of the stationary contact after closing. This relative slippage between the movable and stationary contacts during the closing and opening processes prolonged the contact time between the movable and stationary contacts, shortening the service life of the contact system.

[0005] Based on this, this application is filed. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a moving contact and a circuit breaker to solve the problem of relative slippage between the moving contact and the static contact when they come into contact and separate in the existing technology, maintain the stable cooperation between the moving contact and the static contact, and thus improve the service life of the contacts.

[0007] To achieve the above-mentioned objectives, the structure of the moving contact of the present invention is as follows: it includes a moving contact body, an axial hole is opened in the middle of the moving contact body, and is characterized in that the axial hole includes a first hole position in the open state and a second hole position in the closed state, the first hole position is directly connected to the second hole position and both include an upper limit wall and a lower limit wall, the spacing between the upper limit wall and the lower limit wall forms the hole position width, the upper limit walls and the lower limit walls of the first hole position and the second hole position are directly connected by an intermediate limit wall, and the upper limit wall and the lower limit wall are respectively on the same straight line segment or arc segment, and the shape of the straight line segment or arc segment and the inclination direction and angle relative to the bottom of the circuit breaker in the use state are adapted to the closing trajectory of one end of the linkage between the moving contact and the tripping system.

[0008] Through the above-mentioned structural arrangement, the closing hole position (i.e., the second hole position) and the opening hole position (i.e., the first hole position) are closely designed, and the shape of the axial hole between the closing and opening holes matches the closing trajectory. This allows the bottom of the moving contact to stably move toward or away from the static contact along a straight line or arc within a small range of its travel, preventing the moving contact from sliding relative to the static contact when in use. This not only shortens the contact time between the moving and static contacts during the opening and closing processes, thereby improving the product's breaking capacity, but also prevents contact slip damage caused by relative slip between the moving and static contacts during the opening and closing processes, thereby increasing the contact service life.

[0009] In the above structure, the first hole position in the open state refers to the contact point where the rotating shaft, which cooperates with the moving contact and provides a rotational fulcrum for the moving contact, cooperates with or should cooperate with the moving contact when the moving contact and the static contact are closed. The second hole position in the closed state refers to the contact point where the rotating shaft, which cooperates with the moving contact and provides a rotational fulcrum for the moving contact, cooperates with or should cooperate with the moving contact when the moving contact and the static contact are open. It can be seen that the rotational fulcrum of the moving contact is the contact point, which is dynamic and changes with the closing and opening states of the moving contact.

[0010] The present invention is further arranged as follows: the shaft hole also includes a spring hole position for hanging a spring, the spring hole position and the first hole position and the second hole position are distributed in a fan shape, the spring hole position is connected to the second hole position arranged close to it, and the connection has a corner connected by an arc segment, which can not only reduce the number of holes on the moving contact and facilitate processing, but also avoid the spring hole position being connected with the first hole position and the second hole position, resulting in the rotating shaft accidentally entering the spring hole position during closing and opening, affecting the closing and opening actions.

[0011] The present invention is further configured as follows: the angles between the spring hole position and the second hole position and the first hole position are obtuse angles.

[0012] More specifically, the obtuse angle is 130-150°; alternatively, 142-146°. This angle closely matches the moving contact's trajectory during closing and limits its displacement along the Z axis. This ensures that the opening and closing hole positions are within a relatively optimal range, facilitating rapid closing and opening. Furthermore, at this angle, the swinging fit between the shaft hole and the moving contact is optimized, and the relative slip between the moving and stationary contacts is less than 0.01mm, ensuring that the moving contact consistently contacts the center of the stationary contact.

[0013] The present invention further provides the following configuration: the spacing between the upper and lower limit walls forms a hole width, the first and second hole widths being equal or similar, and the first and second hole widths being greater than the diameter of a rotating shaft mating with the moving contact. Thus, when switching from closing to opening, the operating mechanism provides the moving contact with space for the operating mechanism's connecting rod to move quickly and directly without hindrance, thereby achieving rapid opening and reducing the contact time between the moving and static contacts during closing and opening.

[0014] The present invention is further configured as follows: the width of the spring hole and the hole at the connection between it and the second hole is adapted to the diameter of the rotating shaft that cooperates with the moving contact, and a narrowed structure is formed at the corner to limit the rotating shaft that cooperates with the moving contact to the second hole and the first hole.

[0015] The present invention is further configured as follows: a corner between the upper limit wall of the second hole and the upper limit wall of the spring hole is closer to the spring hole than a corner between the lower limit wall of the second hole and the lower limit wall of the spring hole.

[0016] The above structure forms a special-shaped structure in which the openings at the opening and closing positions are slightly wider and the spring hole and its connecting section are tightened. Resistance is formed by the narrowed side of the opening, thereby greatly increasing the difficulty of the rotating shaft entering the spring hole from the second hole and reducing misoperation.

[0017] The present invention is further arranged as follows: the radius corresponding to the arc segment of the corner between the second hole position and the upper limit wall of the spring hole position is 1 / 2 of the radius corresponding to the arc segment of the corner between the second hole position and the lower limit wall of the spring hole position.

[0018] The above structure makes the inner arc of the corner smaller than the outer arc, thereby effectively separating the spring hole from the first hole and the second hole, and also effectively limits the swing distance and amplitude of the swing shaft between the first hole and the second hole, thereby shortening the contact time between the moving contact and the static contact during the closing and opening process and achieving rapid opening.

[0019] Another object of the present invention is to provide a circuit breaker comprising any one of the above-mentioned moving contact structures. By configuring the shaft hole structure of the above-mentioned moving contact, the present invention can enable the moving contact to directly contact or separate from the static contact when closing or opening the circuit, thereby preventing relative slippage between the moving contact and the static contact, thereby improving the electrical performance of the product and extending its service life.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention improves the deficiencies of the prior art by controlling the movement amplitude of the moving contact during the disconnection and closing processes by adjusting the shaft hole structure of the moving contact, thereby avoiding relative sliding between the moving contact and the static contact when they are in contact. This can not only make the contacts disconnect faster, but also maintain the reliability of product contact, thereby improving the product's breaking capacity, reducing sliding damage, and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of a specific embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the shaft hole structure of the moving contact in a specific embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the contact between the moving contact and the static contact in a specific embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the closing state of the prior art.

[0026] Figure 5 This is a schematic diagram of the second closing state of the prior art.

[0027] Figure 6 Schematic diagram of the shaft hole structure of a specific embodiment of the present invention Figure 1 .

[0028] Figure 7 Schematic diagram of the shaft hole structure of a specific embodiment of the present invention Figure 2 .

[0029] Figure numerals: 1, static contact; 2, moving contact; 3, tripping system; 4, operating mechanism; 101, static contact; 201, moving contact; 210, shaft hole; 210a, first hole position; 210b, second hole position; 210c, upper corner; 210d, lower corner; 210e, straight section of closing trajectory; 210f, spring hole position. DETAILED DESCRIPTION

[0030] The present invention provides a moving contact 2, comprising a body of the moving contact 2. An axial hole 210 is defined in the middle of the body of the moving contact 2. The axial hole 210 is adapted to the closing trajectory of one end of the movable contact 2 in conjunction with the tripping system 3. This structural design enables the movable contact 201 to maintain relatively stable linear or arcuate motion, minimizing or even eliminating relative slippage between the movable contact 201 and the stationary contact 101 during closing and opening, which could affect performance and lifespan.

[0031] The present invention is further described below with reference to specific embodiments.

[0032] Example 1 This embodiment provides a moving contact 2 structure, which includes an irregularly shaped body with a certain length and an axial hole 210 in the middle as a rotation fulcrum. One end of the body is hinged to the end of the last transmission link of the tripping mechanism, and the other end of the body is provided with a moving contact 201 on the side along the rotation direction when the axial hole 210 is used as the rotation fulcrum.

[0033] Combine Figure 2 As shown, the shaft hole 210 is a special-shaped hole, which is formed by connecting the first hole position 210a in the open state, the second hole position 210b in the closed state, and the spring hole position 210f in a fan shape. Figure 1 As shown, the first hole position 210a corresponding to the open state is located at the top, and the second hole position 210b corresponding to the closed state is located at the bottom. Figure 2 As a reference, the first hole position 210a and the second hole position 210b are located on the same X-axis and Y-axis coordinates. Both the first hole position 210a and the second hole position 210b have upper and lower limit sidewalls. The gap between the upper and lower limit sidewalls of the first hole position 210a is opposite to form a first hole width. The gap between the upper and lower limit sidewalls of the second hole position 210b is opposite to form a second hole width. The hole widths of the first and second holes are greater than the diameter of the rotating shaft that mates with the moving contact.

[0034] The upper limit side wall of the first hole position 210a and the upper limit side wall of the second hole position 210b are on the same straight line segment and are connected by an intermediate limit side wall. The lower limit side wall of the first hole position 210a and the lower limit side wall of the second hole position 210b are on the same straight line segment and are connected by an intermediate limit side wall.

[0035] Combine Figure 1As shown, the shape of the closing trajectory straight section 210e where the upper limit side wall of the first hole position 210a and the upper limit side wall of the second hole position 210b are located is adapted to the closing trajectory of one end of the linkage between the moving contact and the tripping system in the use state and the inclination direction and angle relative to the bottom of the circuit breaker. Specifically, the closing trajectory straight section 210e is inclined to the left relative to the bottom of the circuit breaker, and the inclination angle is 22-26 degrees. Figure 7 The spring hole 210f also has an upper limit side wall and a lower limit side wall forming the width of the hole. Figure 6 As shown, the hole width of the spring hole 210f is preferably slightly larger than the diameter of the rotating shaft that cooperates with it, and smaller than the hole widths of the first hole 210a and the second hole 210b. The hole width at the connection between the spring hole 210f and the second hole 210b is adapted to the diameter of the rotating shaft that cooperates with the moving contact. Thus, a narrowing structure is formed at the entrance of the spring hole 210f. Moreover, in this embodiment, the spring hole 210f is distributed in a fan shape and forms an obtuse angle with the second hole 210b and the first hole 210a. The obtuse angle is between 130 and 150 degrees. In this embodiment, the obtuse angle is 142 degrees to 146 degrees. Figure 7 The angle shown in FIG is about 145°. Through the obtuse angle structure and the narrowing structure design, the second hole position 210b and the spring hole position 210f are relatively independent, which can effectively avoid misoperation.

[0036] An upper corner 210c and a lower corner 210d connected by an arc segment are formed between the upper limit wall and the lower limit wall of the spring hole 210fd and the second hole 210b. Figure 2 In the embodiment, the upper corner 210c of the shaft hole is located near the upper end of the shaft hole, that is, on the side of the spring hole 210f, while the lower corner 210d of the shaft hole is located in the middle of the lower edge of the shaft hole. Furthermore, the radius of the arc segment corresponding to the corner between the upper limit wall of the second hole 210b and the upper limit wall of the spring hole 210f is 1 / 2 of the radius of the arc segment corresponding to the corner between the lower limit wall of the second hole 210b and the lower limit wall of the spring hole 210f.

[0037] On the one hand, the structural features of this embodiment improve the coincidence between the shape of the bearing and the closing trajectory. On the other hand, since the corner on the lower edge of the bearing is relatively low and the corner on the upper edge of the shaft hole is relatively high, the closing and opening activity space of the moving contact 2 and the static contact 101 can be further strictly and stably limited between the first hole position 210a and the second hole position 210b: so that when the product switches from the closed state to the open state, when the moving contact 2 is pulled upward and swung by the tripping system 3, the rotating shaft matched with it is restricted by the upper limit side wall of the second hole position 210b and cannot slide (i.e., move in the vertical direction), but can only move to the right (i.e., the first hole position 210a) along the middle limit side wall between the second hole position 210b and the first hole position 210a. This movement will not drive the moving contact to move in the Z-axis direction, even if the contact point between the moving contact and the static contact is always maintained at Figure 3 Point B shown in the figure does not move.

[0038] On the contrary, when the product is transferred from the open state to the closed state, the movable contact 2 slides downward and swings under the action of the tripping system 3, and the rotating shaft matched with it moves on the lower limit side wall of the first hole 210a and the middle limit side wall connected thereto to the second hole 210b. In this embodiment, the contact point between the movable contact and the static contact is always kept at Figure 3 Point B shown in the figure does not move.

[0039] Example 2: This example differs from Example 1 in that the opening size of the first hole 210a and the portion of the connecting section directly connected to the first hole 210a is adapted to the diameter of the rotating shaft mating with the moving contact 2. The opening size of the first hole 210a is larger than the opening size of the portion of the connecting section directly connected to the first hole 210a. This limits the swing of the rotating shaft when mated with the first hole 210a, improving the stability of the moving contact after opening.

[0040] Embodiment 3 This embodiment provides a circuit breaker, comprising a cover, a base, and a terminal installed between the cover and the base, a tripping system 3, an operating mechanism 4, and a contact system. The contact system comprises a fixedly installed static contact 1 and a movable contact 2 provided in the above embodiment that is movably matched with the static contact 1. The movable contact 201 of the movable contact 2 provided in the above embodiment maintains an arc or linear motion relative to the static contact 101 during the opening and closing process, as shown in FIG. Figure 3 As shown, when closing, it directly contacts the middle of the static contact 101 and maintains this state until opening.

[0041] When the movable contact 201 of the prior art is closed, it first contacts the upper part of the static contact 101, and the contact point A is as shown in FIG. Figure 4As shown, with the action of the tripping system 3, the moving contact 201 moves down to the middle of the static contact 101 and contacts it, see Figure 5 The middle contact point A' is shown. The opening process is the opposite of the above process. From the above process, it can be seen that the movable contact 201 of the prior art takes a long time to open the static contact 101. The arc generated during the opening will continue to burn the contact during this period, causing contact damage and shortening the service life.

[0042] In addition to the low-voltage circuit breaker product mentioned in the present invention, the movable contact 2 of the present invention can also be applied to other low-voltage electrical products with contact systems, such as contactors and relays.

[0043] In summary, the present invention provides a moving contact 2 and a circuit breaker thereof that are simple to modify and have excellent performance. By adjusting the motion trajectory of the rotating fulcrum of the moving contact 2, the moving contact 2 is adapted to the closing trajectory of the tripping mechanism, thereby maintaining the stability of the moving contact 201 and the static contact 101, and achieving short-distance rapid opening and closing, thereby achieving the purpose of reducing contact damage and improving performance and life.

Claims

1. A moving contact, comprising a moving contact body, wherein a shaft hole is provided in the middle of the moving contact body, characterized in that: The shaft hole includes a first hole position in the open state and a second hole position in the closed state. The first hole position is directly connected to the second hole position and both include an upper limit wall and a lower limit wall. The spacing between the upper limit wall and the lower limit wall forms the hole width. The upper limit walls and the lower limit walls of the first hole position and the second hole position are directly connected by an intermediate limit wall, and the upper limit wall and the lower limit wall are respectively on the same straight line segment or arc segment, and the shape of the straight line segment or arc segment and the inclination direction and angle relative to the bottom of the circuit breaker in the use state are adapted to the closing trajectory of one end of the linkage between the moving contact and the tripping system; the shaft hole also includes The spring hole position is used to hang the spring, and the spring hole position is distributed in a fan shape with the first hole position and the second hole position. The spring hole position is connected to the second hole position arranged adjacent to it, and the connection has a corner connected by an arc segment; the angle between the spring hole position and the second hole position and the first hole position is an obtuse angle; the hole width of the spring hole position and the connection between it and the second hole position is adapted to the diameter of the rotating shaft cooperating with the moving contact, and a narrowing structure is formed at the corner, which limits the rotating shaft cooperating with the moving contact to the second hole position and the first hole position; the hole width of the first hole position and the second hole position is greater than the diameter of the rotating shaft cooperating with the moving contact.

2. The movable contact according to claim 1, characterized in that: The obtuse angle is 130-150°.

3. The movable contact according to claim 2, characterized in that: The obtuse angle is 142°~146°.

4. The movable contact according to claim 1, wherein: The first hole position and the second hole position have the same hole position width.

5. The movable contact according to claim 1, wherein: A corner between the upper limit wall of the second hole and the upper limit wall of the spring hole is closer to the spring hole than a corner between the lower limit wall of the second hole and the lower limit wall of the spring hole.

6. The movable contact according to claim 1, characterized in that: The radius of the arc segment of the corner between the second hole position and the upper limit wall of the spring hole position is 1 / 2 of the radius of the arc segment of the corner between the second hole position and the lower limit wall of the spring hole position.

7. A circuit breaker comprising a cover, a base, and terminals mounted between the cover and the base, a tripping system, an operating mechanism, and a contact system, characterized in that: The contact system includes a fixedly installed static contact and a movable contact according to any one of claims 1 to 6 that movably cooperates with the static contact.

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