A closing sudden-closing mechanism for a circuit breaker and an interlocking circuit breaker

Abstract

The present invention relates to a closing and sudden contact mechanism for a circuit breaker, which includes a housing, a static contact and a moving contact, and an arc extinguishing cover. The arc extinguishing cover is rotatably connected to the housing and contacts the moving contact. The arc extinguishing cover has a first position for making the moving contact contact the static contact and a second position for separating the moving contact from the static contact; a sudden contact shaft, the sudden contact shaft has a variable diameter section, and the variable diameter section contacts the arc extinguishing cover. By rotating the sudden contact shaft, the arc extinguishing cover is moved between the first position and the second position. A radial protrusion is also provided on the sudden contact shaft; a handle assembly, which contacts the radial protrusion, and the sudden contact shaft can be driven to rotate by rotating the handle assembly; a sudden contact shaft return spring, which is configured to drive the sudden contact shaft to rotate along a direction opposite to the acting force of the handle assembly. The present invention also relates to an interlocking circuit breaker configured with the above-mentioned closing and sudden contact mechanism for a circuit breaker. The present invention can achieve synchronous closing of multiple circuits, and has a simple structure and reliable use.

Description

Technical Field

[0001] The present invention relates to an electrical switch, in particular to a closing impact mechanism for a circuit breaker and an interlocking circuit breaker. Background Art

[0002] As a circuit protection device, a circuit breaker plays a very important role in electrical connections. In some application scenarios, some electrical equipment needs to meet the requirement of synchronous startup. Therefore, it is necessary to synchronously close multiple circuit breakers to meet the usage requirements. Existing interlocking circuit breakers generally only have a multi-linkage tripping function and do not have a synchronous closing function. Moreover, when the circuit breaker is closed, an arc is likely to be generated between the moving contact and the static contact, burning the contacts. Therefore, reducing the action time of the arc can achieve the effect of protecting the contacts.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] An object of the present invention is to overcome the deficiencies of the prior art and provide a closing impact mechanism for a circuit breaker that can enable the circuit breaker to achieve synchronous closing, and has the characteristics of simple structure and good arc extinguishing effect.

[0005] To achieve the first object, the present invention adopts the following technical solutions:

[0006] A closing impact mechanism for a circuit breaker includes a housing, a static contact and a moving contact installed in the housing, and the moving contact contacts or separates from the static contact by rotation.

[0007] It further includes

[0008] an arc extinguishing cover, which is rotatably connected to the housing and contacts the moving contact. The arc extinguishing cover has a first position where the moving contact contacts the static contact and a second position where the moving contact separates from the static contact;

[0009] a plunger shaft, which has a variable diameter section, and the variable diameter section contacts the arc extinguishing cover. By rotating the plunger shaft, the arc extinguishing cover is moved between the first position and the second position. A radial protrusion is also provided on the plunger shaft;

[0010] a handle assembly, which contacts the radial protrusion, and by rotating the handle assembly, the plunger shaft can be driven to rotate in a first direction;

[0011] a plunger shaft return spring, one end of which is fixedly arranged relative to the housing and the other end contacts the radial protrusion. The plunger shaft return spring is configured to drive the plunger shaft to rotate in a second direction along a direction opposite to the acting force of the handle assembly;

[0012] When the plunger shaft rotates in the first direction, the arc extinguishing cover is moved to the first position; when the plunger shaft rotates in the second direction, the arc extinguishing cover is moved to the second direction.

[0013] Further, a concave notch is provided on the outer peripheral surface of the engaging shaft. The notch is in the same straight line as the arc extinguishing cover and has a width greater than that of the arc extinguishing cover. When the engaging shaft rotates, the arc extinguishing cover rotates by cooperating with the notch.

[0014] Further, the handle assembly includes

[0015] an engaging swing rod, which is swingably arranged in the housing and is in sliding contact with the radial convex portion;

[0016] a handle rod, which is rotatably installed on the housing and is configured to drive the engaging swing rod to swing.

[0017] The engaging shaft return spring contacts the side of the radial convex that faces away from the engaging swing rod.

[0018] Further, the circuit breaker closing engaging mechanism further includes

[0019] a pressure rod mechanism, which is rotatably connected to the housing and is respectively connected to the handle rod and the moving contact. The pressure rod mechanism is configured to apply pressure to the moving contact to drive the moving contact to move towards the static contact;

[0020] a moving contact return spring, one end of which is fixedly arranged relative to the housing, and the other end extends between the pressure rod mechanism and the moving contact and is configured to drive the moving contact to move away from the static contact.

[0021] Further, the pressure rod mechanism includes a connecting seat. The middle of the connecting seat is rotatably connected to the housing. One end of the connecting seat is connected to the handle rod through a connecting rod, and the other end is rotatably connected to a pressure rod. The other end of the pressure rod is rotatably connected to the moving contact. The handle rod drives the moving contact to act through the pressure rod mechanism.

[0022] Further, the pressure rod can be telescopic, and a compression spring is sleeved on the pressure rod. The compression spring is configured to extend the pressure rod and generate a force for driving the moving contact to move towards the static contact.

[0023] Further, the arc extinguishing cover is in a bucket-shaped structure, and its spout faces the side of the moving contact. An arc-shaped smooth surface is provided in the spout and is in sliding contact with the moving contact. The upper end of the arc extinguishing cover is rotatably connected to the housing, and the lower end of the side facing away from the spout contacts the engaging shaft. The moving contact squeezes the arc extinguishing cover to keep the arc extinguishing cover in contact with the engaging shaft.

[0024] Further, there are multiple static contacts and moving contacts. The number of arc extinguishing covers matches the number of moving contacts or static contacts. The multiple arc extinguishing covers are arranged at equal intervals along the axial direction of the engaging shaft, and the multiple arc extinguishing covers are configured to rotate synchronously.

[0025] To achieve the second object, the present invention adopts the following technical solutions:

[0026] A linkage circuit breaker configured with the above-mentioned circuit breaker closing sudden closing mechanism.

[0027] After adopting the technical solutions of the present invention, the following beneficial effects are brought:

[0028] The circuit breaker closing sudden closing mechanism of the present invention can enable the moving contact and the static contact to be quickly closed, reduce the generation time of the arc, and achieve the purpose of protecting the moving contact and the static contact. On the other hand, multiple moving contacts can move synchronously, meeting the requirements of synchronous closing of multiple circuits, and having small resistance during closing, being easy to operate, and having the advantages of simple structure and long service life. Description of the Drawings

[0029] Figure 1 : An embodiment diagram of the linkage circuit breaker of the present invention;

[0030] Figure 2 : Another embodiment diagram of the linkage circuit breaker of the present invention;

[0031] Figure 3 : The front view of the linkage circuit breaker of the present invention after removing part of the housing;

[0032] Figure 4 : The partial front view of the circuit breaker closing sudden closing mechanism of the present invention;

[0033] Figure 5 : The exploded view of the circuit breaker closing sudden closing mechanism of the present invention;

[0034] Figure 6 : The schematic diagram when the arc extinguishing cover of the present invention is in the second position;

[0035] Figure 7 : The schematic diagram when the arc extinguishing cover of the present invention is in the first position;

[0036] Wherein: 1. Housing 2. Static contact 3. Moving contact 4. Arc extinguishing cover 5. Sudden closing shaft 6. Handle assembly 7. Sudden closing shaft return spring 8. Pressing rod mechanism 9. Moving contact return spring 51. Radial convex portion 52. Notch 61. Sudden closing swing rod 62. Handle rod 81. Connecting seat 82. Connecting rod 83. Pressing rod 84. Compression spring 4a. First position 4b. Second position. Detailed Embodiments

[0037] The following further describes in detail the specific embodiments of the present invention with reference to the drawings.

[0038] Combined with Figure 3 、 Figure 4 And Figure 5As shown in the figure, a closing and sudden-closing mechanism for a circuit breaker includes a housing 1, a static contact 2, a moving contact 3, an arc extinguishing cover 4, a sudden-closing shaft 5, a handle assembly 6, a sudden-closing shaft return spring 7, a pressure rod mechanism 8, and a moving contact return spring 9. The static contact 2 is fixedly installed on the housing 1, and the moving contact 3 is rotatably installed on the housing 1 and contacts or separates from the static contact 2 by rotation. When the moving contact 3 contacts the static contact 2, the circuit is connected, and when the moving contact 3 separates from the static contact 2, the circuit is disconnected.

[0039] Combined with Figure 6 and Figure 7 As shown, the arc extinguishing cover 4 is rotatably connected to the housing 1 and contacts the moving contact 3. The arc extinguishing cover 4 is an insulator. The arc extinguishing cover 4 has a first position 4a where the moving contact 3 contacts the static contact 2 and a second position 4b where the moving contact 3 separates from the static contact 2. When the arc extinguishing cover 4 is in the second position 4b, one end of it is embedded between the moving contact 3 and the static contact 2. When the arc extinguishing cover 4 is in the first position 4a, this end withdraws to one side of the moving contact 3 and the static contact 2.

[0040] The sudden-closing shaft 5 has a variable-diameter section, and the variable-diameter section contacts the arc extinguishing cover 4. By rotating the sudden-closing shaft 5, the arc extinguishing cover 4 is moved between the first position 4a and the second position 4b. When the sudden-closing shaft 5 rotates, the arc extinguishing cover 4 rotates by changing the distance from the arc extinguishing cover 4 to the axis of the sudden-closing shaft 5. The variable-diameter section is formed by an inwardly concave notch 52 provided on the outer peripheral surface of the sudden-closing shaft 5. The notch 52 is in the same straight line as the arc extinguishing cover 4, and its width is greater than the width of the arc extinguishing cover 4. When the sudden-closing shaft 5 rotates, the arc extinguishing cover 4 cooperates with the notch 52 to rotate. The arc extinguishing cover 4 is closely attached to the sudden-closing shaft 5. When one side of the notch 52 contacts the arc extinguishing cover 4, the arc extinguishing cover 4 will move towards the axis of the sudden-closing shaft 5 and then move to the first position 4a. When the notch 52 rotates to separate from the arc extinguishing cover 4, the arc extinguishing cover 4 will move away from the axis of the sudden-closing shaft 5 and then move to the second position 4b.

[0041] A radial protrusion 51 is also provided on the sudden-closing shaft 5. The handle assembly 6 contacts the radial protrusion 51. By rotating the handle assembly 6, the sudden-closing shaft 5 can be driven to rotate in the first direction. When the sudden-closing shaft 5 rotates in the first direction, the arc extinguishing cover 4 is moved to the first position 4a. One end of the sudden-closing shaft return spring 7 is fixedly arranged relative to the housing 1, such as being clamped on the housing 1, and the other end contacts the radial protrusion 51. The sudden-closing shaft return spring 7 is configured to drive the sudden-closing shaft 5 to rotate in the second direction along the direction opposite to the acting force of the handle assembly 6. When the sudden-closing shaft 5 rotates in the second direction, the arc extinguishing cover 4 is moved to the second position.

[0042] The handle assembly 6 includes a mating swing rod 61 and a handle rod 62. The mating swing rod 61 is swingably arranged in the housing 1, and one end of its bottom is in sliding contact with the radial protrusion 51. The handle rod 62 is rotatably mounted on the housing 1, its upper end extends to the outside of the housing 1, and its lower end is in contact with the mating swing rod 61 and is configured to drive the mating swing rod 61 to swing.

[0043] The mating shaft return spring 7 is in contact with the side of the radial protrusion 51 facing away from the mating swing rod 61, and the acting force of the mating shaft return spring 7 keeps the radial protrusion 51 in contact with the mating swing rod 61.

[0044] The pressure rod mechanism 8 is rotatably connected to the housing 1 and is respectively connected to the handle rod 62 and the moving contact 3. The pressure rod mechanism 8 is configured to apply pressure to the moving contact 3 to drive the moving contact 3 to move towards the static contact 2. One end of the moving contact return spring 9 is fixedly arranged relative to the housing 1, and the other end extends between the pressure rod mechanism 8 and the moving contact 3 and is configured to drive the moving contact 3 to move away from the static contact 2. The acting force direction of the moving contact return spring 9 is opposite to the acting force direction of the pressure rod mechanism 8.

[0045] Specifically, the pressure rod mechanism 8 includes a connecting seat 81. The middle of the connecting seat 81 is rotatably connected to the housing 1. One end of the connecting seat 81 is connected to the handle rod 62 through a connecting rod 82, and the other end is rotatably connected to a pressure rod 83. The other end of the pressure rod 83 is rotatably connected to the moving contact 3. When the handle rod 62 rotates, the moving contact 3 is driven to act through the pressure rod mechanism 8 to drive the moving contact 3 to move towards the static contact 2.

[0046] The pressure rod 83 can be telescopic, and a compression spring 84 is sleeved on the pressure rod 83. The compression spring 84 is configured to extend the pressure rod 83 and generate an acting force to drive the moving contact 3 to move towards the static contact 2. When the arc extinguishing cover 4 is in the second position 4b, the compression spring 84 stores potential energy as the handle rod 62 rotates. As the handle rod 62 continues to rotate, the notch 52 on the mating shaft 5 will contact the arc extinguishing cover 4, causing the arc extinguishing cover 4 to move to the second position 4b. At this time, under the action of the compression spring 84, the moving contact 3 quickly rotates to contact the static contact 2, reducing the generation time of the arc and being beneficial to protecting the moving contact 3 and the static contact 2.

[0047] The arc extinguishing cover 4 has a bucket-like structure, with its spade mouth facing one side of the moving contact 3. There is an arc-shaped smooth surface inside the spade mouth, which is in sliding contact with the moving contact 3. The upper end of the arc extinguishing cover 4 is rotatably connected to the housing 1, and the side of the lower end facing away from the spade mouth is in contact with the engaging shaft 5. By contacting the smooth surface, the moving contact 3 generates a thrust on the arc extinguishing cover 4, causing the arc extinguishing cover 4 to closely adhere to the engaging shaft 5. When the arc extinguishing cover 4 contacts the notch 52 on the engaging shaft 5, this force pushes the arc extinguishing cover 4 to move towards the axis direction of the engaging shaft 5, and at the same time, the moving contact 3 rotates downward to contact the static contact 2, realizing the closing of the circuit. The moving contact 3 keeps the arc extinguishing cover 4 in contact with the engaging shaft 5 by squeezing the arc extinguishing cover 4.

[0048] There are multiple static contacts 2 and moving contacts 3. The number of the arc extinguishing covers 4 matches the number of the moving contacts 3 or the static contacts 2. The multiple arc extinguishing covers 4 are arranged at equal intervals along the axial direction of the engaging shaft 5, and the multiple arc extinguishing covers 4 are configured to rotate synchronously. The number of the notches 52 on the engaging shaft 5 is the same as the number of the arc extinguishing covers 4, and the directions of the notches 52 are the same, enabling the multiple arc extinguishing covers 4 to rotate synchronously and achieving the purpose of linkage of the multiple moving contacts 3.

[0049] As Figure 1 shown, in an embodiment of the present invention, there is also a linked circuit breaker configured with the above-mentioned circuit breaker closing engaging mechanism. The linked circuit breaker includes two pairs of moving contacts 3 and static contacts 2.

[0050] As Figure 2 shown, in another embodiment of the present invention, there is also a linked circuit breaker configured with the above-mentioned circuit breaker closing engaging mechanism. The linked circuit breaker includes three pairs of moving contacts 3 and static contacts 2.

[0051] The above are the embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, various modifications and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A closing and sudden contact mechanism for a circuit breaker, comprising a housing, a static contact and a moving contact installed in the housing, and the moving contact is in contact with or separated from the static contact by rotation. Characterized in that: It further includes an arc extinguishing cover, which is an insulator. The arc extinguishing cover is rotatably connected to the housing and is in contact with the moving contact. The arc extinguishing cover has a first position for making the moving contact contact with the static contact and a second position for making the moving contact separate from the static contact. A sudden contact shaft, the sudden contact shaft has a variable diameter section, and the variable diameter section is in contact with the arc extinguishing cover. The variable diameter section is formed by an inward concave notch provided on the outer peripheral surface of the sudden contact shaft. The notch and the arc extinguishing cover are on the same straight line. The width of the notch is greater than the width of the arc extinguishing cover. When the sudden contact shaft rotates, the arc extinguishing cover cooperates with the notch to rotate. A radial protrusion is also provided on the sudden contact shaft. A handle assembly, which is in contact with the radial protrusion, and the sudden contact shaft can be driven to rotate in the first direction by rotating the handle assembly. A sudden contact shaft return spring, one end of which is fixedly arranged relative to the housing, and the other end is in contact with the radial protrusion. The sudden contact shaft return spring is configured to drive the sudden contact shaft to rotate in the second direction along the direction opposite to the acting force of the handle assembly. The arc extinguishing cover is closely attached to the sudden contact shaft. By rotating the sudden contact shaft, the arc extinguishing cover moves between the first position and the second position. When the sudden contact shaft rotates in the first direction, when one side of the notch contacts the arc extinguishing cover, the arc extinguishing cover moves towards the axis direction of the sudden contact shaft and then moves to the first position. When the sudden contact shaft rotates in the second direction, when the notch rotates to be separated from the arc extinguishing cover, the arc extinguishing cover moves away from the axis direction of the sudden contact shaft and then moves to the second position.

2. A closing and sudden contact mechanism for a circuit breaker according to claim 1, Characterized in that: The handle assembly includes a sudden contact swing rod, which is swingably arranged in the housing and is in sliding contact with the radial protrusion. A handle rod, the handle rod is rotatably installed on the housing and is configured to drive the sudden contact swing rod to swing. The sudden contact shaft return spring is in contact with the side of the radial protrusion facing away from the sudden contact swing rod.

3. A closing and sudden contact mechanism for a circuit breaker according to claim 2, Characterized in that: It further includes a pressure rod mechanism, which is rotatably connected to the housing and is respectively connected to the handle rod and the moving contact. The pressure rod mechanism is configured to apply pressure to the moving contact to drive the moving contact to move towards the static contact. A moving contact return spring, one end of which is fixedly arranged relative to the housing, and the other end extends between the pressure rod mechanism and the moving contact and is configured to drive the moving contact to move away from the static contact.

4. A closing and sudden contact mechanism for a circuit breaker according to claim 3, Characterized in that: The pressure rod mechanism includes a connecting seat, the middle part of the connecting seat is rotatably connected to the housing, one end of the connecting seat is connected to the handle rod through a connecting rod, the other end is rotatably connected to a pressure rod, and the other end of the pressure rod is rotatably connected to the moving contact. The handle rod drives the moving contact to act through the pressure rod mechanism.

5. A closing and sudden contact mechanism for a circuit breaker according to claim 4, Characterized in that: The pressure rod can be telescopic, and a compression spring is sleeved on the pressure rod. The compression spring is configured to elongate the pressure rod and generate a force for driving the moving contact to move towards the static contact.

6. A closing sudden - closing mechanism of a circuit breaker according to claim 1, characterized in that: The arc extinguishing cover is in a bucket - like structure, with its spade - mouth facing the side of the moving contact. There is an arc - shaped smooth surface in the spade - mouth and it is in sliding contact with the moving contact. The upper end of the arc extinguishing cover is rotatably connected to the housing, and the lower end on the side opposite to the spade - mouth contacts the sudden - closing shaft. The moving contact makes the arc extinguishing cover keep in contact with the sudden - closing shaft by squeezing the arc extinguishing cover.

7. A closing sudden - closing mechanism of a circuit breaker according to claim 1, characterized in that: There are multiple static contacts and moving contacts. The number of the arc extinguishing covers matches the number of the moving contacts or the static contacts. The multiple arc extinguishing covers are arranged at equal intervals along the axial direction of the sudden - closing shaft, and the multiple arc extinguishing covers are configured to rotate synchronously.

8. A linkage circuit breaker, characterized in that: It is configured with a closing sudden - closing mechanism of a circuit breaker as described in any one of claims 1 - 7.

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