A high and low temperature compensation mechanism for a circuit breaker

Abstract

The invention discloses a high and low temperature compensation mechanism for a circuit breaker, characterized in that it comprises a limit lock (1), the limit lock (1) is connected to a limit compensation plate (2), and the limit compensation distance a between the limit compensation plate (2) and the limit lock (1) is 0.15-0.55 mm. The invention designs a temperature compensation mechanism to compensate for the maximum deformation displacement of a thermal release under high and low temperature environments, so as to ensure that the relative displacement between the thermal release and the unlocking mechanism remains unchanged under high and low temperature environments. According to the test method of GJB5885-2006 "General Specification for Aviation Circuit Breakers", the product is tested and verified in high and low temperature environments. The product has an operating environment temperature range of up to -55°C to +125°C, and the product temperature range index is leading in China and advanced abroad.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, in particular to a high and low temperature compensation mechanism of a circuit breaker. Background Art

[0002] Currently, most circuit breakers used in the aviation sector are thermal circuit breakers, operating on the principle of a thermal bimetallic electrothermal tripping mechanism. These circuit breakers are characterized by their small size and light weight. However, due to the nature of their operating principle, they are susceptible to ambient temperature fluctuations during use, leading to false tripping and protection failures, which in turn affects the reliability of the circuit breaker. Therefore, to ensure product reliability, a high- and low-temperature compensation mechanism is required. Existing temperature compensation mechanisms suffer from the following shortcomings: a complex structure, low compensation accuracy, and low reliability. For example, the circuit breaker temperature compensation mechanism and circuit breaker disclosed in Chinese patent CN203941869U utilizes a U-shaped structure that deforms with changes in ambient temperature, causing the distance between the two legs of the U to change, compensating for the travel displacement of the main circuit tripping mechanism and ensuring a constant relative displacement between the two legs, thereby ensuring reliable operation within the specified ambient temperature range. A disadvantage is that this design requires a base for installation, making it bulky and heavy, making it unsuitable for aviation circuit breakers with high volume and weight requirements.

[0003] For example, Chinese patent CN200993942Y discloses a circuit breaker with temperature compensation. Its temperature compensation mechanism is a straight-plate structure that can deform and compensate for the deformation and displacement of the bimetallic component with a sliding plate as the ambient temperature changes, ensuring that the relative displacement between the two remains unchanged, thereby ensuring that the circuit breaker can operate reliably within the specified ambient temperature range. However, the disadvantage is that the compensation temperature range of this compensation mechanism is relatively narrow (up to only -55°C to +85°C), which does not meet the application requirements of some characteristic environments. Summary of the Invention

[0004] The present invention aims to provide a high and low temperature compensation mechanism for a circuit breaker. The present invention has the characteristics of simple structure, high compensation accuracy, wide compensation temperature range (up to -55°C to +125°C), strong environmental adaptability, and is suitable for special applications in aviation circuit breakers.

[0005] The technical solution of the present invention is as follows: the high and low temperature compensation mechanism of the circuit breaker includes a limit lock, the limit lock is connected to the limit compensation plate, and the limit compensation distance a between the limit compensation plate and the limit lock is 0.15-0.55mm.

[0006] In the aforementioned high and low temperature compensation mechanism of the circuit breaker, the limit lock includes a lock plate and an inclined lock buckle, and the limit compensation distance a is the distance between the limit compensation plate and the lock buckle.

[0007] In the aforementioned high and low temperature compensation mechanism of the circuit breaker, the inclination angle of the locking piece and the lock catch is 2-11°.

[0008] In the aforementioned high and low temperature compensation mechanism of the circuit breaker, the inclination angle of the locking piece and the locking catch is 5-8°.

[0009] The high and low temperature compensation mechanism of the aforementioned circuit breaker, the limit compensation piece is divided into a connecting section, a limit section and an extension section, the connecting section is connected to one end of the limit lock, and the limit compensation distance a is the distance between the limit section and the lock buckle.

[0010] In the aforementioned high and low temperature compensation mechanism of the circuit breaker, the limiting section and the connecting section are arranged obliquely, and the inclination angle is 1-20°.

[0011] The high and low temperature compensation mechanism of the aforementioned circuit breaker has a limiting spring piece on the other side of the limit lock. The limiting spring piece is divided into a spring piece connecting section, a spring piece segment and a hook section. The spring piece connecting section and the spring piece segment are tilted, and the tilt angle is 30-60°.

[0012] In the aforementioned high and low temperature compensation mechanism of the circuit breaker, the spring connecting section of the limiting spring is connected to the other side of the lock catch of the limiting lock.

[0013] The spring piece connecting section of the limiting spring piece is connected to the other side of the lock buckle of the limiting lock.

[0014] Beneficial effects: Compared with the existing technology, the present invention designs a temperature compensation mechanism to compensate for the maximum deformation displacement of the thermal release in high and low temperature environments, so as to ensure that the relative displacement between the thermal release and the unlocking mechanism remains unchanged in high and low temperature environments. According to the test method of GJB5885-2006 "General Specifications for Aviation Circuit Breakers", the high and low temperature environment test is carried out to verify that the product's operating environment temperature range can reach up to -55°C to +125°C. The product temperature range index is leading in China and advanced abroad. The present invention utilizes the temperature sensitivity of highly sensitive thermal bimetallic materials and selects them as the material for the limit compensation plate. According to the working principle and mechanism operation mechanism of this type of circuit breaker, its temperature compensation structure is designed. The limit compensation plate part structure is designed into three sections, namely the connection section, the limit section and the extension section. The three-section structure is designed for this purpose: one section serves as a connecting section, connected to one end of the limit lock. The limit section primarily compensates for the displacement of circuit breaker tripping mechanisms with smaller displacement compensation requirements. Through theoretical design calculations, three-dimensional motion simulation, and experimental verification, the maximum and minimum allowable displacement ranges between the circuit breaker tripping and unlocking mechanisms were determined, and the limit compensation distance a was set to 0.15-0.55mm. The extended section primarily compensates for the displacement of circuit breaker tripping mechanisms with larger displacement compensation requirements, and is designed with a certain inclination to increase the compensation displacement. When the displacement provided by the limit section is insufficient to compensate for the displacement of the tripping mechanism, the extended section provides further compensation. This balances the relative displacement between the tripping and unlocking mechanisms under different ambient temperature conditions, ensuring the reliability of the circuit breaker.

[0015] Inclined angle design of the lock plate and lock buckle

[0016] Through theoretical design calculations, three-dimensional motion simulation and experimental verification, the maximum and minimum allowable displacement ranges between the circuit breaker tripping mechanism and the unlocking mechanism are determined, so that the inclination angle of the locking plate and the lock buckle is designed to be 30-60°.

[0017] To achieve the effect:

[0018] The comprehensive technical performance indicators of this type of structural design are higher than those of similar products of domestic peers, leading domestically and advanced abroad. The technical indicators of circuit breakers compared with similar advanced manufacturers at home and abroad are shown in Table 1:

[0019] Table 1 Comparison of technical indicators of circuit breakers with similar advanced manufacturers at home and abroad

[0020] BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the limit lock of the present invention;

[0023] Figure 3 yes Figure 2 Schematic diagram of the middle AA direction;

[0024] Figure 4 yes Figure 2 Schematic diagram of the middle BB direction;

[0025] Figure 5-7 It is a schematic diagram of the status of the temperature compensation mechanism before the circuit breaker operating mechanism is closed, when it is closed, and when it is opened. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0027] Example 1. A high and low temperature compensation mechanism for a circuit breaker, such as Figure 1-7 As shown, it includes a limit lock 1, which is connected to a limit compensation piece 2, and a limit compensation distance a between the limit compensation piece 2 and the limit lock 1 is 0.15-0.55 mm.

[0028] The limit lock 1 includes a lock plate 4 and an inclined lock buckle 5 , and the limit compensation distance a is the distance between the limit compensation plate 2 and the lock buckle 5 .

[0029] The locking plate 4 and the lock catch 5 have an inclination angle of 2-11 degrees. More preferably, the locking plate 4 and the lock catch 5 have an inclination angle of 5-8 degrees. The inclination of the locking plate 4 and the lock catch 5 serves to limit the displacement of the limiting section 7 within a certain compensation displacement range.

[0030] The limit compensation piece 2 is divided into a connecting section 6, a limit section 7 and an extension section 8. The connecting section 6 is connected to one end of the limit lock 1. The limit compensation distance a is the distance between the limit section 7 and the lock buckle 5.

[0031] The limiting section 7 is tilted with respect to the connecting section 6, and the tilt angle is 1-20 degrees. The limiting section 7 is tilted, and when the limiting section compensation is limited, the displacement compensation can continue.

[0032] On the other side of the limit lock 1 is a limit spring 3, which consists of a spring connecting section 10, a spring segment 11, and a hook section 9. The spring connecting section 10 and the spring segment 11 are tilted at an angle of 30-60 degrees. This ensures that the limit lock mechanism can quickly and normally reset after the tripping mechanism and the unlocking mechanism are released.

[0033] The spring connecting section 10 of the limiting spring 3 is connected to the other side of the lock buckle 5 of the limiting lock 1 .

[0034] Working Principle: The limit compensation plate in the temperature compensation mechanism is a highly sensitive thermal bimetallic composite material, composed of three different layers: an active layer, an intermediate layer, and a passive layer. The expansion coefficient of the active layer is higher than that of the passive layer. Its temperature characteristics: At low temperatures, it bends toward the side with the lower expansion coefficient; at high temperatures, it bends toward the side with the higher expansion coefficient.

[0035] In a low-temperature environment, since the thermal circuit breaker works on the principle of electrothermal tripping, the thermal release has a large heat dissipation, and the deformation displacement of the thermal release is smaller than that at normal temperature. The limit compensation piece 2 in the temperature compensation mechanism is affected by the low temperature and deforms and bends toward the passive layer side, compensating for the displacement of the thermal release, thereby ensuring that the relative displacement between the thermal trip mechanism and the unlocking mechanism remains unchanged, and realizing reliable unlocking and tripping of the mechanism.

[0036] In a high-temperature environment, since the thermal circuit breaker works on the principle of electrothermal tripping, the thermal release has low heat dissipation and the deformation and displacement generated by the thermal release is larger than that at normal temperature. The limit compensation plate in the temperature compensation mechanism is affected by the high temperature and bends toward the active layer to compensate for the excess displacement of the thermal release, ensuring that the relative displacement between the thermal trip mechanism and the unlocking mechanism remains unchanged, thereby achieving reliable unlocking and tripping of the mechanism.

[0037] Example 2. A high and low temperature compensation mechanism for a circuit breaker, such as Figure 1-7 As shown, it includes a limit lock 1, which is connected to a limit compensation piece 2, and a limit compensation distance a between the limit compensation piece 2 and the limit lock 1 is 0.3 mm.

[0038] The position limiting lock 1 includes a locking piece 4 and an inclined locking buckle 5, and the position limiting compensation distance a is the distance between the position limiting compensation piece 2 and the locking buckle 5. The inclination angle of the locking piece 4 and the locking buckle 5 is 6°.

[0039] The limiting compensation piece 2 is divided into a connecting section 6, a limiting section 7 and an extension section 8. The connecting section 6 is connected to one end of the limiting lock 1. The limiting compensation distance a is the distance between the limiting section 7 and the lock buckle 5.

[0040] The limiting section 7 and the connecting section 6 are arranged tilted, with an inclination angle of 10°.

[0041] A limiting spring piece 3 is provided on the other side of the limiting lock 1. The limiting spring piece 3 is divided into a spring piece connecting section 10, a spring piece section 11 and a hook section 9. The spring piece connecting section 10 and the spring piece section 11 are tilted at an angle of 45°.

[0042] The spring connecting section 10 of the limiting spring 3 is connected to the other side of the lock buckle 5 of the limiting lock 1 .

[0043] Example 3. High and low temperature compensation mechanism of circuit breaker, such as Figure 1-7As shown, it includes a limit lock 1, which is connected to a limit compensation piece 2, and a limit compensation distance a between the limit compensation piece 2 and the limit lock 1 is 0.4 mm.

[0044] The position limiting lock 1 includes a locking piece 4 and an inclined locking buckle 5, and the position limiting compensation distance a is the distance between the position limiting compensation piece 2 and the locking buckle 5. The inclination angle of the locking piece 4 and the locking buckle 5 is 9°.

[0045] The limiting compensation piece 2 is divided into a connecting section 6, a limiting section 7 and an extension section 8. The connecting section 6 is connected to one end of the limiting lock 1. The limiting compensation distance a is the distance between the limiting section 7 and the lock buckle 5.

[0046] The limiting section 7 and the connecting section 6 are arranged tilted, with an inclination angle of 15°.

[0047] A limiting spring piece 3 is provided on the other side of the limiting lock 1. The limiting spring piece 3 is divided into a spring piece connecting section 10, a spring piece section 11 and a hook section 9. The spring piece connecting section 10 and the spring piece section 11 are tilted at an angle of 40°.

[0048] The spring connecting section 10 of the limiting spring 3 is connected to the other side of the lock buckle 5 of the limiting lock 1 .

[0049] Example 4. High and low temperature compensation mechanism of circuit breaker, such as Figure 1-7 As shown, it includes a limit lock 1, which is connected to a limit compensation piece 2, and the limit compensation distance a between the limit compensation piece 2 and the limit lock 1 is 0.5 mm.

[0050] The position limiting lock 1 includes a locking piece 4 and an inclined locking buckle 5, and the position limiting compensation distance a is the distance between the position limiting compensation piece 2 and the locking buckle 5. The inclination angle of the locking piece 4 and the locking buckle 5 is 4°.

[0051] The limiting compensation piece 2 is divided into a connecting section 6, a limiting section 7 and an extension section 8. The connecting section 6 is connected to one end of the limiting lock 1. The limiting compensation distance a is the distance between the limiting section 7 and the lock buckle 5.

[0052] The limiting section 7 and the connecting section 6 are arranged tilted, with an inclination angle of 5°.

[0053] A limiting spring piece 3 is provided on the other side of the limiting lock 1. The limiting spring piece 3 is divided into a spring piece connecting section 10, a spring piece section 11 and a hook section 9. The spring piece connecting section 10 and the spring piece section 11 are tilted at an angle of 35°.

[0054] The spring connecting section 10 of the limiting spring 3 is connected to the other side of the lock buckle 5 of the limiting lock 1 .

Claims

1. A high and low temperature compensation mechanism for a circuit breaker, characterized by: The invention comprises a limit lock (1), the limit lock (1) is connected to a limit compensation plate (2), and the limit compensation distance a between the limit compensation plate (2) and the limit lock (1) is 0.15-0.55 mm; the limit compensation plate (2) is divided into a connecting section (6), a limit section (7) and an extension section (8), the connecting section (6) is connected to one end of the limit lock (1), and the limit compensation distance a is the distance between the limit section (7) and the lock buckle (5); the limit section (7) is inclined at an angle to the connecting section (6) in a direction away from the lock plate, and the extension section (8) is inclined at an angle to the limit section (7) in a direction close to the lock plate.

2. The high and low temperature compensation mechanism of the circuit breaker according to claim 1, characterized in that: The limit lock (1) comprises a lock plate (4) and an inclined lock buckle (5), and the limit compensation distance a is the distance between the limit compensation plate (2) and the lock buckle (5).

3. The high and low temperature compensation mechanism of the circuit breaker according to claim 2, characterized in that: The inclination angles of the locking piece (4) and the locking buckle (5) are 2-11 degrees.

4. The high and low temperature compensation mechanism of the circuit breaker according to claim 3, characterized in that: The inclination angle of the locking piece (4) and the locking buckle (5) is 5-8°.

5. The high and low temperature compensation mechanism of the circuit breaker according to claim 1, characterized in that: The limiting section (7) and the connecting section (6) are arranged to be inclined, with an inclination angle of 1-20°.

6. The high and low temperature compensation mechanism of the circuit breaker according to claim 1, characterized in that: A limiting spring (3) is provided on the other side of the limiting lock (1). The limiting spring (3) is divided into a spring connecting section (10), a spring section (11) and a hook section (9). The spring connecting section (10) and the spring section (11) are tilted, and the tilt angle is 30-60 degrees.

7. The high and low temperature compensation mechanism of the circuit breaker according to claim 6, characterized in that: The spring connecting section (10) of the limiting spring (3) is connected to the other side of the lock buckle (5) of the limiting lock (1).

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