A high anti-vibration structure of a circuit breaker

Abstract

The present invention discloses a high anti-vibration structure for a circuit breaker, characterized in that: it includes a limit lock assembly, the limit lock assembly includes a limit lock (1), the limit lock (1) is connected to a limit compensation piece (2), a lock groove (3) is provided on the limit lock (1), the lock groove (3) is connected to a linkage buckle piece (4), the lower end of the lock groove (3) of the limit lock (1) is inclined, and the inclination angle β between the lower end of the lock groove (3) and the limit lock (1) is 2-11°. The structure of the present invention is simple and has excellent performance indicators, and can meet sinusoidal vibration: (10-500) Hz, 0.75 mm / 10 g; (10-2000) Hz, 0.75 mm / 15 g; random vibration: 0.2 g<supgt;2< / supgt> / Hz (10-2000 Hz); acceleration: 17 g; shock: 75 g (11 ms); gunfire vibration: 1.462 g<supgt;2< / supgt> / Hz (30-2000 Hz).

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, in particular to a high anti-vibration structure of a circuit breaker. Background Art

[0002] At present, most of the circuit breakers used in the aviation field are thermal circuit breakers, which work on the principle of thermal bimetal electrothermal tripping. They have the characteristics of small size, light weight, etc. The circuit breaker is prone to be affected by vibration, shock, acceleration and vibration environment during application, resulting in misoperation protection phenomenon, thus affecting the working reliability of the circuit breaker. Its anti-vibration characteristic is mainly affected by the unlocking sensitivity of the unlocking mechanism. The higher the unlocking sensitivity, the higher the control precision of the circuit breaker, but the anti-vibration characteristic will be relatively reduced, and vice versa.

[0003] For example, a push-button type circuit breaker disclosed in Chinese Patent No. 201610751704.1 has the characteristics of small size, light weight, long service life, convenient installation and use. It can manually press to lock and connect the power supply, automatically cut off the power supply under overcurrent tripping, manually pull out the operating handle to cut off the power supply, has high precision of tripping current, and strong anti-vibration and anti-shock capabilities. It is mainly applicable to fields such as aerospace, aviation, and locomotives. Its locking assembly includes a locking piece, a U-shaped locking piece and a base. The locking piece is riveted to the end of the push rod piece, and a torsion spring is provided on one side of the locking piece; the U-shaped locking piece is fixed on the locking shaft, and a tension spring is provided between the U-shaped locking piece and the torsion spring.

[0004] In order to improve the anti-vibration performance of the thermal circuit breaker and meet the high requirements of the aviation field, it is necessary to research and improve the circuit breaker and its core components. Summary of the Invention

[0005] The purpose of the present invention is to provide a high anti-vibration structure of a circuit breaker. The present invention has the characteristics of simple structure, good anti-vibration effect, and is suitable for the special application field of aviation circuit breakers.

[0006] The technical solution of the present invention: The high anti-vibration structure of a circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock. The limit lock is connected to a limit compensation piece. A lock groove is provided on the limit lock. The lock groove is connected to a linkage buckle piece. The lower end of the lock groove of the limit lock is inclined. The inclination angle β between the lower end of the lock groove and the limit lock is 2 - 11°. Maximum range

[0007] For the above high anti-vibration structure of a circuit breaker, β is 2.1 - 10.8°.

[0008] For the above high anti-vibration structure of a circuit breaker, β is 4 - 8.8°.

[0009] For the above high anti-vibration structure of a circuit breaker, a limit elastic piece is provided on the other side of the limit lock. The limit elastic piece is divided into an elastic piece connection section, an elastic piece section and a hook section. The elastic piece connection section and the elastic piece section are inclined, and the inclination angle is 30 - 60°.

[0010] The high anti-vibration structure of the above circuit breaker, the limit compensation piece is divided into a compensation connection section, a limit section and an extension section, and the compensation connection section is connected to one end of the limit lock.

[0011] The high anti-vibration structure of the above circuit breaker, the linkage buckle piece is connected to the linkage mechanism.

[0012] The high anti-vibration structure of the above circuit breaker, the limit lock includes a lock piece, positioning shafts are arranged on both sides of the lock piece, the lock piece is divided into a locking component and a compensation component, a locking groove is arranged on the locking component, and the compensation component is connected to the limit compensation piece.

[0013] Beneficial effects: The working principle of the circuit breaker is as follows: When the operating mechanism of the circuit breaker is in the closed and connected state, the linkage buckle piece is buckled with the locking groove of the limit lock in the limit lock assembly under the action of the linkage mechanism and the torsion spring and the tension spring in the linkage mechanism, so that the circuit breaker is kept in the connected and locked state. The applicant's research found that the locking strength is mainly determined by the locking angle of the limit lock. If the locking angle is too large, it will cause the locking point of the linkage buckle piece to be tightly locked with the locking groove of the limit lock, and the thermal thrust generated by the tripping mechanism is not enough to unlock, resulting in the mechanism not being able to unlock and trip normally; if the locking angle is too small, it is easy to cause the locking point of the linkage buckle piece to slip or not be able to be buckled with the locking groove of the limit lock, and the mechanism locking is unreliable, resulting in poor anti-vibration characteristics of the mechanism.

[0014] The force analysis of the unlocking mechanism and the locking force analysis of the circuit breaker of this patent are as Figure 9 . The anti-vibration, impact and acceleration capabilities of the circuit breaker in this project mainly depend on the locking force of the mechanism. The locking force mainly comes from the deformation thrust of the reset spring piece and the locking angle of the limit lock parts. If the thrust of the reset spring piece is too large or the locking angle of the limit lock is too large, it is difficult for the circuit breaker to unlock; if the thrust of the reset spring piece is too small or the locking angle of the limit lock is too small, the anti-vibration and impact capabilities of the circuit breaker are weakened. Through multiple preliminary tests and data record analysis, the force value of the reset spring piece and the locking force value are calculated as follows:

[0015] P = Ebh 3 X / 4L 3

[0016] In the formula: P—the maximum deformation force of the reset spring piece during the unlocking process (N)

[0017] E—elastic modulus (N / mm 2 ), the value is taken as 176500 N / mm 2

[0018] b—the width of the reset spring piece (mm), the design value is 3 mm

[0019] h—the thickness of the reset spring piece (mm), the selected material is 0.12 mm

[0020] X—the maximum deflection of the reset spring plate, with a design value of 1 (mm)

[0021] L—the effective length of the reset spring plate (mm), 4.8 mm

[0022] P = Ebh 3 X / 4L 3 =(176500 × 3 × 0.12 3 × 1) / (4 × 4.8 3 )

[0023] = 2.1 N

[0024] P: the deformation force of the reset spring plate

[0025] Fj: the unlocking force

[0026] Ft: the locking force

[0027] From: Fj=(P × Lp) / Lj=(2.1 × 2.6) / 8.2 = 0.66 N

[0028] Ft=(P × Lp) / Lt=(2.1 × 2.6) / 5.5 = 1 N

[0029] Through the research and analysis of multiple linear forces, 3D simulation, theoretical calculation and experimental verification on the thermal release, the maximum deformation thrust that can be generated in the thermal linear region of the thermal bimetal sheet in the thermal release is determined. On the basis of not exceeding this kinetic energy, the unlocking sensitivity of the unlocking mechanism is reduced as much as possible, and the locking angle of the limit lock is set within a certain range, so as to improve the anti-vibration ability of the circuit breaker and ensure the reliable operation of the circuit breaker.

[0030] Through theoretical calculation, the linear thrust of the thermal release of this type of circuit breaker is 1.2 - 1.5 N > 0.66 N (mechanism unlocking force), which can reliably push the mechanism to unlock. At the same time, multiple tests and data collection are carried out on the anti-vibration, impact and acceleration capabilities of the locking force. When the locking force ≥ 0.75 N and the locking angle of the limit lock is designed within the range of 2° - 11°, it can meet the sine vibration: (10 - 500) Hz, 0.75 mm / 10 g; (10 - 2000) Hz, 0.75 mm / 15 g; random vibration: 0.2 g 2 / Hz (10 - 2000 Hz); acceleration: 17 g; impact: 75 g (11 ms); shelling vibration: 1.462 g 2 / Hz (30 - 2000 Hz).

[0031] To sum up, the design value of the locking force of this type of circuit breaker is 1 N > 0.75 N, and the locking angle of the limit lock is designed within the range of 2.1° - 10.8°, which can fully meet the technical index requirements of the anti-high-magnitude vibration, impact and acceleration of this series of products. Better still, the locking angle is 4 - 8.8°.

[0032] Technical advantages:

[0033] For domestic peer manufacturers, the internal structure of this type of product is a shrapnel structure, without a similar independent anti-vibration mechanism. The anti-vibration performance is determined by the overall structure, and the comprehensive technical performance is poor, belonging to products with a low anti-vibration level. The main technical advantages of the anti-vibration mechanism of this type of product of our company are as follows:

[0034] 1) It has an independent anti-vibration mechanism design, and the anti-vibration structure is simple and reliable;

[0035] 2) The anti-vibration value is leading in China and advanced abroad. The index comparison is shown in Table 1;

[0036] 3) It can be applied to application scenarios with a relatively complex vibration environment and high requirements for anti-vibration performance.

[0037] The structural design of this product and the comprehensive technical performance indicators are higher than those of domestic peer products of the same type, reaching the leading level in China and being advanced abroad. The comparison of the technical indicators of the circuit breaker with those of domestic and foreign advanced manufacturers of the same type is shown in Table 1:

[0038] Table 1 Comparison of technical indicators of circuit breakers with those of domestic and foreign advanced manufacturers of the same type

[0039] Brief description of the drawings

[0040] Figure 1 is the structural schematic diagram of the present invention;

[0041] Figure 2 is the structural schematic diagram of the limit lock of the present invention;

[0042] Figure 3 is Figure 2 the schematic view in the A-A direction in

[0043] Figure 4 is Figure 2 the schematic view in the B-B direction in

[0044] Figure 5 is the structural schematic diagram of the limit lock assembly;

[0045] Figures 6 - 8 is the schematic diagram of the states of the temperature compensation mechanism before, during, and after the closing of the circuit breaker operating mechanism;

[0046] Figure 9 is the locking force analysis diagram.

[0047] 1 - Limit lock, 2 - Limit compensation piece, 3 - Lock groove, 4 - Linking buckle piece, 5 - Linkage mechanism, 6 - Limit elastic piece, 7 - Elastic piece connection section, 8 - Elastic piece section, 9 - Hook section, 10 - Compensation connection section, 11 - Limit section, 12 - Extension section, 13 - Lock piece, 14 - Positioning shaft, 15 - Locking component, 16 - Compensation component. Detailed implementation method

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0049] Embodiment 1. The high anti-vibration structure of the circuit breaker is as Figures 1 - 8 shown, including a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. A lock groove 3 is provided on the limit lock 1. The lock groove 3 is connected to a linking buckle piece 4. The lower end of the lock groove 3 on the limit lock 1 is inclined. The inclination angle β between the lower end of the lock groove 3 and the limit lock 1 is 2 - 11°.

[0050] Preferably, the β is 2.1 - 10.8°. Further, a better solution is that the β is 4 - 8.8°.

[0051] A limit elastic piece 6 is provided on the other side of the limit lock 1. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8, and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 30 - 60°.

[0052] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11, and an extension section 12. The compensation connection section 10 is connected to one end of the limit lock 1.

[0053] The linking buckle piece 4 is connected to the linkage mechanism 5.

[0054] The limit lock 1 includes a lock piece 13. Positioning shafts 14 are provided on both sides of the lock piece 13. The lock piece 13 is divided into a locking component 15 and a compensation component 16. A lock groove 3 is provided on the locking component 15. The compensation component 16 is connected to the limit compensation piece 2.

[0055] Limit lock assembly: It is composed of a limit elastic piece 6, a limit compensation piece 2, and a limit lock 1. Among them, the limit lock 1 mainly plays the roles of mechanism locking and high anti-vibration characteristics; the limit elastic piece 6 mainly plays the role of mechanism reset; the limit compensation piece 2 mainly plays the role of temperature compensation.

[0056] Linking buckle piece 4: It mainly plays the role of mechanism linkage, locks with the lock groove of the limit lock, and enables the mechanism to ensure the locked state.

[0057] Linkage mechanism 5: It mainly connects each structural component together to form a linkage mechanism, thereby realizing the functions of mechanism unlocking and locking, and enabling the electrical circuit of the circuit breaker product to be normally connected and disconnected.

[0058] Working principle: When the circuit breaker operating mechanism is in the closed and connected state, the interlocking buckle 4 is buckled with the locking groove 3 of the limit lock 1 in the limit lock assembly under the action of the link mechanism 5 and the torsion spring and tension spring in the link mechanism 5, so that the circuit breaker maintains the connected and locked state.

[0059] Embodiment 2. The high anti-vibration structure of the circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. The limit lock 1 is provided with a locking groove 3. The locking groove 3 is connected to the interlocking buckle 4. The lower end of the locking groove 3 of the limit lock 1 is inclined. The inclination angle β between the lower end of the locking groove 3 and the limit lock 1 is 3°.

[0060] A limit elastic piece 6 is arranged on the other side of the limit lock 1. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8 and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 40°.

[0061] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11 and an extension section 12. The compensation connection section 10 is connected to one end of the limit lock 1.

[0062] Embodiment 3. The high anti-vibration structure of the circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. The limit lock 1 is provided with a locking groove 3. The locking groove 3 is connected to the interlocking buckle 4. The lower end of the locking groove 3 of the limit lock 1 is inclined. The inclination angle β between the lower end of the locking groove 3 and the limit lock 1 is 6°.

[0063] A limit elastic piece 6 is arranged on the other side of the limit lock 1. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8 and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 50°.

[0064] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11 and an extension section 12. The compensation connection section 10 is connected to one end of the limit lock 1. The interlocking buckle 4 is connected to the link mechanism 5.

[0065] The limit lock 1 includes a lock piece 13. Positioning shafts 14 are arranged on both sides of the lock piece 13. The lock piece 13 is divided into a locking component 15 and a compensation component 16. The locking component 15 is provided with a locking groove 3. The compensation component 16 is connected to the limit compensation piece 2.

[0066] Embodiment 4. The high anti-vibration structure of the circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. The limit lock 1 is provided with a locking groove 3. The locking groove 3 is connected to the interlocking buckle 4. The lower end of the locking groove 3 of the limit lock 1 is inclined. The inclination angle β between the lower end of the locking groove 3 and the limit lock 1 is 7°.

[0067] On the other side of the limit lock 1, there is a limit elastic piece 6. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8, and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 45°.

[0068] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11, and an extension section 12. The compensation connection section 10 is connected to one end of the limit lock 1. The linkage buckle piece 4 is connected to the linkage mechanism 5.

[0069] The limit lock 1 includes a lock piece 13. Positioning shafts 14 are provided on both sides of the lock piece 13. The lock piece 13 is divided into a lock component 15 and a compensation component 16. A lock groove 3 is provided on the lock component 15. The compensation component 16 is connected to the limit compensation piece 2.

[0070] Embodiment 5. The high anti-vibration structure of the circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. A lock groove 3 is provided on the limit lock 1. The lock groove 3 is connected to the linkage buckle piece 4. The lower end of the lock groove 3 of the limit lock 1 is inclined, and the inclination angle β between the lower end of the lock groove 3 and the limit lock 1 is 10°.

[0071] On the other side of the limit lock 1, there is a limit elastic piece 6. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8, and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 55°.

[0072] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11, and an extension section 12. The compensation connection section 10 is connected to one end of the limit lock 1. The linkage buckle piece 4 is connected to the linkage mechanism 5.

[0073] The limit lock 1 includes a lock piece 13. Positioning shafts 14 are provided on both sides of the lock piece 13. The lock piece 13 is divided into a lock component 15 and a compensation component 16. A lock groove 3 is provided on the lock component 15. The compensation component 16 is connected to the limit compensation piece 2.

[0074] Embodiment 6. The high anti-vibration structure of the circuit breaker includes a limit lock assembly. The limit lock assembly includes a limit lock 1. The limit lock 1 is connected to a limit compensation piece 2. A lock groove 3 is provided on the limit lock 1. The lock groove 3 is connected to the linkage buckle piece 4. The lower end of the lock groove 3 of the limit lock 1 is inclined, and the inclination angle β between the lower end of the lock groove 3 and the limit lock 1 is 9°.

[0075] On the other side of the limit lock 1, there is a limit elastic piece 6. The limit elastic piece 6 is divided into an elastic piece connection section 7, an elastic piece section 8, and a hook section 9. The elastic piece connection section 7 and the elastic piece section 8 are inclined, and the inclination angle is 35°.

[0076] The limit compensation piece 2 is divided into a compensation connection section 10, a limit section 11 and an extension section 12, and the compensation connection section 10 is connected to one end of the limit lock 1. The linkage buckle piece 4 is connected to the linkage mechanism 5.

[0077] The limit lock 1 includes a lock piece 13, positioning shafts 14 are arranged on both sides of the lock piece 13, the lock piece 13 is divided into a lock buckle component 15 and a compensation component 16, a lock buckle groove 3 is arranged on the lock buckle component 15, and the compensation component 16 is connected to the limit compensation piece 2.

Claims

1. A high anti-vibration structure for a circuit breaker, characterized in that: It includes a limit lock assembly. The limit lock assembly includes a limit lock (1). The limit lock (1) is connected to a limit compensation piece (2). A lock slot (3) is provided on the limit lock (1). The lock slot (3) is connected to a linkage buckle piece (4). The lower end of the lock slot (3) of the limit lock (1) is inclined. The inclination angle β between the lower end of the lock slot (3) and the limit lock (1) is 2.1 - 10.8°. The limit compensation piece (2) is divided into a compensation connection section (10), a limit section (11) and an extension section (12). The compensation connection section (10) is connected to one end of the limit lock (1). The limit section (11) is inclined at an angle away from the lock piece with respect to the compensation connection section (10). The extension section (12) is inclined at an angle towards the lock piece with respect to the limit section (11).

2. The high anti-vibration structure of the circuit breaker according to claim 1, characterized in that: The β is 4 - 8.8°.

3. The high anti-vibration structure of the circuit breaker according to claim 1, characterized in that: A limit elastic piece (6) is provided on the other side of the limit lock (1). The limit elastic piece (6) is divided into an elastic piece connection section (7), an elastic piece section (8) and a hook section (9). The elastic piece connection section (7) and the elastic piece section (8) are inclined, and the inclination angle is 30 - 60°.

4. The high anti-vibration structure of the circuit breaker according to claim 1, characterized in that: The linkage buckle piece (4) is connected to a linkage mechanism (5).

5. The high anti-vibration structure of the circuit breaker according to claim 1, characterized in that: The limit lock (1) includes a lock piece (13). Positioning shafts (14) are provided on both sides of the lock piece (13). The lock piece (13) is divided into a lock buckle part (15) and a compensation part (16). A lock slot (3) is provided on the lock buckle part (15). The compensation part (16) is connected to the limit compensation piece (2).

Images