Hydraulic electromagnetic circuit breaker for railway signals and arc extinguishing structure thereof

Abstract

The invention discloses a railway signal hydraulic electromagnetic circuit breaker and an arc extinguishing structure thereof, the railway signal hydraulic electromagnetic circuit breaker comprises a run-on plate, a current-conducting plate and an arc extinguishing chamber, the current-conducting plate and the arc extinguishing chamber are fixed in a circuit breaker shell, the run-on plate is fixed on the current-conducting plate, and a static contact is fixed on the current-conducting plate; when the movable feeler lever is connected with the static contact, the circuit breaker is electrified; when the movable contact rod is separated from the static contact, the movable contact rod swings and passes through the arc extinguish chamber, so that the circuit breaker is powered off; the arc extinguishing chamber comprises a plurality of arc extinguishing grid plates, and the tops of the arc extinguishing grid plates incline towards the static contact. An inclined arc striking end is arranged on the arc striking plate, and an included angle with a downward opening is formed between the arc striking end and the arc extinguishing grid plate. Therefore, the efficiency of effectively lengthening the electric arc after arc striking can be improved, the extinguishing of the electric arc is accelerated, and the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic electromagnetic circuit breakers, and in particular to a hydraulic electromagnetic circuit breaker for railway signals and an arc extinguishing structure thereof. Background Art

[0002] An arc-starting plate is added near the static contact of the circuit breaker to introduce the arc into the arc extinguishing chamber of the circuit breaker. However, the existing arc-starting plates are all extended like arc extinguishing grids. Although this can reduce the residence time of the arc on the static contact, the arc is extinguished in the arc extinguishing chamber, and the length of the arc is slightly short, resulting in poor breaking capacity of the circuit breaker.

[0003] The prior art with announcement number CN201754393U discloses a circuit breaker with improved arc-striking pieces, comprising a base, a static contact, an arc-striking piece and an arc-extinguishing chamber; the arc-extinguishing chamber is composed of a plurality of arc-striking pieces installed on the base through a bracket, each arc-striking piece is respectively provided with a U-shaped opening groove, and a waist-shaped small hole is respectively provided on the inner side of each U-shaped opening groove; the static contact is installed on the base corresponding to the arc-extinguishing chamber; the arc-striking piece has two bends and forms a first bent piece and a second bent piece by the two bends; the first bent piece is bent downward, the second bent piece is bent upward, and the length of the second bent piece is greater than the length of the first bent piece; the arc-striking piece is connected to the static contact through the first bent piece, and the end of the second bent piece of the arc-striking piece is close to the waist-shaped small hole of an arc-extinguishing piece in the lowest layer in the arc-extinguishing chamber.

[0004] In the prior art, the arc-starting piece is only an arc-extinguishing piece that guides the arc to the arc-extinguishing chamber. The arc-starting effect is poor or the arc length is fixed after arc-starting, resulting in a low breaking capacity of the circuit breaker. Summary of the invention

[0005] In order to solve the problems of short arc length and low breaking capacity of circuit breakers in the prior art, the purpose of the present invention is to provide a hydraulic electromagnetic circuit breaker for railway signals and an arc extinguishing structure thereof, which can draw the arc longer, extinguish the arc faster, and increase the breaking capacity of the circuit breaker.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an arc extinguishing structure of a circuit breaker, comprising an arc striking plate, a conductive plate and an arc extinguishing chamber, the conductive plate and the arc extinguishing chamber are fixed in a circuit breaker housing, the arc striking plate is fixed on the conductive plate, and a static contact is fixed on the conductive plate; when the moving contact rod is connected to the static contact, the circuit breaker is energized; when the moving contact rod is separated from the static contact, the moving contact rod swings and passes through the arc extinguishing chamber to cut off the power of the circuit breaker; the arc extinguishing chamber comprises a plurality of arc extinguishing grids, the top of the arc extinguishing grids is inclined toward the static contact; an inclined arc striking end is arranged on the arc striking plate, and the arc striking end and the arc extinguishing grid are at an angle with the opening facing downward.

[0007] Preferably, the arc striking end is in a multi-step shape.

[0008] Preferably, the arc striking end comprises a first-step arc angle and a second-step arc angle 14, and the first-step arc angle and the second-step arc angle 14 are arranged at an included angle.

[0009] Preferably, the angle between the first-step arc angle and the arc-extinguishing grid is smaller than the angle between the second-step arc angle and the arc-extinguishing grid.

[0010] Preferably, the first-step arc angle and the two second-step arc angles are separated from each other.

[0011] Preferably, the first-step arc angle is located between the two second-step arc angles.

[0012] Preferably, the length of the second-step arc angle is greater than the length of the first-step arc angle.

[0013] Preferably, the width of the first-step arc angle is greater than the width of the second-step arc angle.

[0014] A hydraulic electromagnetic circuit breaker for railway signals comprises the arc extinguishing structure of the above-mentioned circuit breaker.

[0015] The beneficial effects of the technical solution of the present invention are as follows: when an arc is generated after the moving contact rod is separated from the static contact, the arc magnetizes the entire arc extinguishing chamber and the arc striking plate, and while the moving contact is separated, the arc is introduced by the arc striking end, and the inclined arc striking end lengthens the arc, and then the arc quickly enters the arc extinguishing chamber and is divided by the arc extinguishing grid to accelerate the extinction of the arc. This not only improves the efficiency of effectively lengthening the arc after arc striking, but also accelerates the extinction of the arc, thereby improving the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the circuit breaker Figure 1 ; Figure 2 The structure of the circuit breaker Figure 2 ; Figure 3 It is a schematic diagram of the connection structure of the conductive plate, the static contact and the arc-starting plate; Figure 4 The structure of the arc-starting plate is shown in Figure 1. Figure 1 ; Figure 5 The structure of the arc-starting plate is shown in Figure 1. Figure 2 ; Figure 6 Schematic diagram of the structure of the conductive plate.

[0017] Reference numerals: 1, arc-starting plate; 11, arc-starting hole; 12, clamping protrusion; 13, first-step arc angle; 14, second-step arc angle; 2. Conductive plate; 21. Second connection end; 22. Mounting hole; 23. Socket; 3. Static contact; 4. Arc extinguishing chamber; 41. Arc extinguishing grid; 5. Equipotential arc starting plate; 6. Electric arc; 7. Moving contact rod; 8. Handle; 9. Tripping mechanism; 91. Armature; 10. Electromagnetic coil; 100. Circuit breaker housing; 200. Incoming terminal; 300. Outgoing terminal. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] The following embodiments are described in Figure 2 The orientation shown is the standard, where the handle is located as upper, upper part or top, the arc extinguishing grid is located as lower, lower part or lower part, the incoming terminal is located as right, right part or right part, and the outgoing terminal is located as left, left part or left part. Example

[0024] like Figures 1 to 6 The arc extinguishing structure of a circuit breaker shown includes a conductive plate 2, an arc striking plate 1 and an arc extinguishing chamber 4. The conductive plate 2 and the arc extinguishing chamber 4 are fixed in a circuit breaker housing 100. The arc striking plate 1 is fixed on the conductive plate 2, and a static contact 3 is fixed on the conductive plate 2. When the moving contact rod 7 is connected to the static contact 3, the circuit breaker is energized. When the moving contact rod 7 is separated from the static contact 3, the moving contact rod 7 swings and passes through the arc extinguishing chamber 4, so that the circuit breaker is de-energized. The arc extinguishing chamber 4 includes a plurality of arc extinguishing grids 41, the top of which is inclined toward the stationary contact 3; an arc striking end is arranged on the arc striking plate 1, and the arc striking end and the arc extinguishing grid 41 are at an angle with the opening facing downward. The plurality of arc extinguishing grids 41 are fixed between the two end plates.

[0025] In the above structure, an arc is generated after the moving contact rod 7 is separated from the static contact 3, and the arc 6 magnetizes the entire arc extinguishing chamber 4 and the arc striking plate 1. When the moving contact is separated, the arc 6 is introduced by the arc striking end, and the inclined arc striking end stretches the arc 6. Then the arc 6 quickly enters the arc extinguishing chamber 4 and is divided by the arc extinguishing grid to accelerate the extinction of the arc 6. This not only improves the efficiency of effectively stretching the arc 6 after arc striking, but also accelerates the extinction of the arc 6, thereby improving the breaking capacity of the circuit breaker.

[0026] In this embodiment, Figures 1 to 5As shown, the arc-striking end is in a multi-stepped shape; specifically, the arc-striking end includes a first-step arc angle 13 and a second-step arc angle 14, and the first-step arc angle 13 and the second-step arc angle 14 are arranged at an angle; wherein, the angle between the first-step arc angle 13 and the arc-extinguishing grid is smaller than the angle between the second-step arc angle 14 and the arc-extinguishing grid plate 41. In this arrangement, the arc 6 is introduced by the relatively flat first-step arc angle 13, and then the second-step arc angle further lengthens the arc 6; such a step-type arc-striking design ensures that the first-step arc angle effectively strikes the arc, and the second-step arc angle lengthens the arc 6, thereby improving the effectiveness and stability after arc-striking, providing the efficiency of lengthening the arc 6, and having the effect of accelerating the extinguishing of the arc 6 and improving the breaking capacity of the circuit breaker.

[0027] In this embodiment, Figure 4 and Figure 5 As shown, the first step arc angle 13 is separated from the two second step arc angles 14. Such an arrangement can ensure that the arc 6 is formed between the first step arc angle 13 and the second step arc angle 14.

[0028] In this embodiment, Figure 4 and Figure 5 As shown, the first step arc angle 13 is located between the two second step arc angles 14. In this arrangement, after the arc 6 is introduced by the first step arc angle 13, the arc 6 is divided into the two second step arc angles 14, thereby dispersing the energy of the arc 6 and accelerating the extinction of the arc 6.

[0029] In this embodiment, Figure 4 and Figure 5 As shown, the length of the second-step arc angle 14 is greater than the length of the first-step arc angle 13. With this arrangement, the arc 6 is elongated between the first-step arc angle 13 and the second-step arc angle 14, and the second-step arc angle 14 and the arc extinguishing grid 41 can further elongate the arc 6, thereby increasing the extension area and length of the arc 6, dispersing the energy of the arc 6, and accelerating the extinction of the arc 6.

[0030] In this embodiment, Figure 4 and Figure 5 As shown, the width of the first step arc angle 13 is greater than the width of the second step arc angle 14. This arrangement can ensure the stability of arc striking by the first step arc angle 13. Further, the static contact 3 and the first step arc angle 13 are both arranged in the middle position of the arc striking plate 1.

[0031] In this embodiment, Figure 2 As shown, in the arc-starting plate 1 and the arc-extinguishing grid plate 41 adjacent thereto: the top of the first ladder arc angle 13 and the top of the second ladder arc angle 14 are both higher than the top of the arc-extinguishing grid plate 41, and the first connection end of the arc-starting plate 1 is higher than the arc-extinguishing grid plate 41. Such an arrangement improves the stability of the arc 6 diversion and provides an area for the arc 6 to be extended and stretched.

[0032] In this embodiment, Figures 3 to 5As shown, the arc-striking plate 1 includes a first connection end, the first connection end is fixedly connected to the conductive plate 2, and the arc-striking end does not contact the conductive plate 2. Further, a clamping protrusion 12 is provided on the first connection end, and a plug hole 23 is provided on the conductive plate 2, and the clamping protrusion 12 and the plug hole are plugged. Further, two clamping protrusions 12 are respectively provided on both sides of the connecting part, and the two plug holes 23 correspond to the two clamping protrusions 12 one by one. Such a configuration facilitates the connection between the conductive plate and the arc-striking plate 1.

[0033] In this embodiment, Figure 6 As shown, one end of the conductive plate 2 is bent to form a second connection end 21, a plug hole 23 is provided on the second connection end 21, and a mounting hole 22 for mounting the static contact 3 is provided at the central position of the second connection end 21. In this way, the angle of the arc-starting plate 1 can be changed and the structure of the arc-starting plate 1 can be simplified.

[0034] In this embodiment, Figures 3 to 5 As shown, an arc-striking hole 11 is provided on the arc-striking plate 1 at the arc-striking end, and the static contact 3 is located in the arc-striking hole. Such an arrangement can effectively improve the stability of arc-striking.

[0035] In this embodiment, Figure 1 and Figure 2 As shown, the arc-starting plate 1 is arranged at one end of the arc-extinguishing chamber 4, and the equipotential arc-starting plate 5 is installed at the other end of the arc-extinguishing chamber 4. In this arrangement, after the static contact 3 and the moving contact rod 7 are completely disconnected, the arc 6 is completely introduced into the arc-extinguishing chamber 4 by the equipotential arc-starting plate 5. At this time, when the arc root of the arc 6 has been introduced to the head of the first-step arc angle 13, it is connected by the magnetized second-step arc angle 14 to lengthen the arc 6 again; this structure can limit the arc 6 in the arc-extinguishing chamber 4, accelerate the extinction of the arc 6, and improve the breaking capacity of the circuit breaker.

[0036] A hydraulic electromagnetic circuit breaker for railway signaling, such as Figure 1 and Figure 2 As shown, the arc extinguishing structure of the circuit breaker includes the above-mentioned circuit breaker, and also includes an incoming terminal 200, an outgoing terminal 300, an oil cup, an armature 91, a tripping mechanism 9 and a handle 8; the handle 8 is rotatably mounted on the circuit breaker housing 100, the handle 8 is connected to the moving contact rod 7 through the tripping mechanism 9, the incoming terminal 200 and the outgoing terminal 300 are both mounted on the circuit breaker housing 100, one end of the conductive plate 2 is fixedly connected to the incoming terminal 200, the oil cup is mounted in the circuit breaker housing 100, an electromagnetic coil 10 is wound around the oil cup, the two ends of the electromagnetic coil 10 are respectively connected to the moving contact rod 7 and the outgoing terminal 300, and the armature 91 is rotatably mounted in the circuit breaker housing 100; the tripping mechanism 9 includes a locked state and an unlocked state, the moving contact rod 7 is separated from the static contact 3; when the tripping mechanism 9 is in the locked state, the moving contact rod 7 can be connected to the static contact 3; after the oil cup and the armature 91 are attracted, the armature 91 can drive the tripping mechanism 9 to unlock, and the moving contact rod 7 is separated from the static contact 3.

[0037] When short-circuited, the magnetic field generated by the electromagnetic coil 10 attracts the armature 91 to close through the oil cup. After the armature 91 is actuated, the tripping mechanism 9 is unlocked. After the tripping mechanism 9 is unlocked, the moving contact rod 7 is separated from the static contact 3 and an arc 6 is generated. The arc 6 magnetizes the entire arc extinguishing chamber 4 and the arc striking plate 1. When the moving contact rod 7 is separated from the stationary contact 3, the arc 6 is introduced by a relatively flat step arc angle 13, and the arc 6 quickly enters the arc extinguishing chamber 4 and is divided by the arc extinguishing grid 41; Among them, after the moving contact is completely disconnected, the arc 6 is completely introduced into the arc extinguishing chamber 4 by the equipotential arc-starting plate 5. At this time, when the arc root of the arc 6 has been introduced to the head of the first-step arc angle 13, the arc root of the arc 6 is connected by the magnetized second-step arc angle 14, and the arc 6 is stretched again, thereby improving the efficiency of stretching the arc 6 after arc striking, accelerating the extinction of the arc 6, and improving the breaking capacity.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An arc extinguishing structure of a circuit breaker, characterized in that: The circuit breaker comprises an arc-starting plate (1), a conductive plate (2) and an arc-extinguishing chamber (4), wherein the conductive plate (2) and the arc-extinguishing chamber (4) are fixed in a circuit breaker housing (100), the arc-starting plate (1) is fixed on the conductive plate (2), and a static contact (3) is fixed on the conductive plate (2); when the moving contact rod (7) is in contact with the static contact (3), the circuit breaker is energized; when the moving contact rod (7) is separated from the static contact (3), the moving contact rod (7) swings and passes through the arc-extinguishing chamber (4), thereby de-energizing the circuit breaker; The arc extinguishing chamber (4) comprises a plurality of arc extinguishing grid plates (41), the tops of the arc extinguishing grid plates (41) being inclined towards the stationary contact (3); an arc striking end arranged in an inclined manner is arranged on the arc striking plate (1), and the arc striking end and the arc extinguishing grid plates (41) are at an angle with the opening facing downwards.

2. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: The arc striking end is in a multi-step shape.

3. The arc extinguishing structure of a circuit breaker according to claim 2, characterized in that: The arc striking end comprises a first-step arc angle (13) and a second-step arc angle 14, and the first-step arc angle (13) and the second-step arc angle 14 are arranged at an included angle.

4. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The included angle between the first-step arc angle (13) and the arc-extinguishing grid piece is smaller than the included angle between the second-step arc angle (14) and the arc-extinguishing grid plate (41).

5. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The first-step arc angle (13) and the two second-step arc angles (14) are separated from each other.

6. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The first-step arc angle (13) is located between the two second-step arc angles (14).

7. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The length of the second-step arc angle (14) is greater than the length of the first-step arc angle (13).

8. The arc extinguishing structure of a circuit breaker according to claim 3, characterized in that: The width of the first-step arc angle (13) is greater than the width of the second-step arc angle (14).

9. A hydraulic electromagnetic circuit breaker for railway signaling, characterized in that: An arc extinguishing structure for a circuit breaker comprising any one of claims 1 to 8.

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