Thermal relay tripping device

Abstract

The utility model belongs to the technical field of tripping devices, and particularly relates to a thermal relay tripping device, which comprises a shell and a tripping assembly, the tripping assembly is arranged in the shell and comprises a first metal sheet and two second metal sheets with different thermal expansion coefficients, and the first metal sheet and the second metal sheet are arranged in the shell. The two second metal sheets are arranged on the two sides of the first metal sheet respectively, the top end and the bottom end of one side of each second metal sheet are fixedly connected with the top end and the bottom end of one side of the first metal sheet respectively, and connecting assemblies are arranged at the two ends of the tripping assembly respectively. According to the utility model, because the number of the second metal sheets is two, one of the second metal sheets deforms towards the direction close to the clamping hook, and the other second metal sheet deforms towards the direction close to the inner wall of the shell, when the side walls of the second metal sheets are contacted with the inner wall of the shell, the whole tripping assembly is pushed to approach the clamping hook, and the contact speed of the tripping assembly and the clamping hook is further improved; the sensitivity is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tripping devices, specifically relating to a thermal relay tripping device. Background Technology

[0002] When the relay is working, if the current passing through the circuit breaker exceeds the rated current for an extended period, the internal metal plate will deform due to heat, pushing the latch and hook to disengage. This will cause the circuit breaker contacts to open under the action of the return spring, cutting off the faulty circuit and achieving the purpose of protection.

[0003] The commonly used thermal tripping device has two metal strips. One strip undergoes a large elastic deformation when heated, while the other undergoes a smaller elastic deformation. To avoid false triggering, there is a certain distance between the metal strip and the latch. If the deformation of the metal strip needs to exceed this distance, it takes a certain amount of time, which in turn affects the sensitivity of the tripping device. Utility Model Content

[0004] The purpose of this invention is to provide a thermal relay tripping device that can increase the contact speed between the tripping component and the hook, thereby improving sensitivity and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a thermal relay tripping device, comprising a housing and a tripping assembly, wherein the tripping assembly is disposed inside the housing, and the tripping assembly includes a first metal sheet and a second metal sheet with different coefficients of thermal expansion, there are two second metal sheets, the two second metal sheets are respectively disposed on both sides of the first metal sheet, the top and bottom ends of one side of the second metal sheet are respectively fixedly connected to the top and bottom ends of one side of the first metal sheet, and connecting components are provided at both ends of the tripping assembly, the connecting components being fixedly installed inside the housing.

[0006] Furthermore, the coefficient of thermal expansion of the second metal sheet is greater than that of the first metal sheet.

[0007] Furthermore, the middle of both second metal sheets is an arc-shaped structure, and the distance between the protruding side of one of the second metal sheets and the inner wall of the outer shell is 1-3 mm.

[0008] Furthermore, the connecting assembly includes a slide rail, one end of which is symmetrically and fixedly connected to a limiting plate, and a metal slider is fixedly connected inside the slide rail. The ends of the first metal plate and the second metal plate are both fixedly connected to the corresponding metal sliders.

[0009] Furthermore, a spring is symmetrically fixedly connected to one side of the metal slider, and one end of the spring is fixedly connected to one end of the inner wall of the slide rail.

[0010] Furthermore, a waist-shaped groove is provided on one side of the slide rail, a cylinder is fixedly connected to one end of the metal slider, the cylinder passes through the waist-shaped groove, and a wire is fixedly welded to one end of the metal slider, the wire passing through the cylinder.

[0011] Furthermore, a support plate is fixedly connected to the inner wall of the outer shell, and one end of one of the slide rails is fixedly connected to one side of the support plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: since two second metal plates are provided, one of the second metal plates deforms towards the hook and the other deforms towards the inner wall of the outer shell. When the side wall of the second metal plate contacts the inner wall of the outer shell, it pushes the entire release assembly towards the hook, thereby increasing the speed at which the release assembly contacts the hook and improving the sensitivity. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a front view of the present invention;

[0015] Figure 3 This is a three-dimensional structural diagram of the tripping assembly and connecting assembly of this utility model.

[0016] The attached diagram lists the components represented by each number as follows:

[0017] 1. Housing; 2. Tripping assembly; 21. First metal plate; 22. Second metal plate; 3. Connecting assembly; 31. Slide rail; 32. Limiting plate; 33. Metal slider; 34. Spring; 35. Waist-shaped groove; 36. Cylinder; 37. Wire; 4. Support plate. Detailed Implementation

[0018] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0019] like Figure 1-3As shown, a thermal relay tripping device includes a housing 1 and a tripping assembly 2. The tripping assembly 2 is disposed inside the housing 1. The tripping assembly 2 includes a first metal sheet 21 and a second metal sheet 22 with different coefficients of thermal expansion. There are two second metal sheets 22, which are respectively disposed on both sides of the first metal sheet 21. The top and bottom ends of one side of the second metal sheet 22 are respectively fixedly connected to the top and bottom ends of one side of the first metal sheet 21. Both ends of the tripping assembly 2 are provided with connecting assemblies 3, which are fixedly installed inside the housing 1. The coefficient of thermal expansion of the second metal sheet 22 is greater than that of the first metal sheet 21.

[0020] According to the above structure, when the first metal piece 21 and the second metal piece 22 are connected to the circuit, when the current in the circuit is too large, the temperature of the first metal piece 21 and the second metal piece 22 will rise. Since the coefficient of thermal expansion of the second metal piece 22 is greater than that of the first metal piece 21, after the temperature rises, the deformation of the second metal piece 22 is greater than that of the first metal piece 21. Therefore, the bulge of the second metal piece 22 intensifies. When one side of one of the second metal pieces 22 comes into contact with the hook of the air switch, it pushes the hook, thereby causing the hook to disengage and form an open circuit.

[0021] like Figure 2 and 3 As shown, the middle part of both second metal plates 22 is an arc-shaped structure, and the distance between the protruding side of one of the second metal plates 22 and the inner wall of the outer shell 1 is 1-3 mm.

[0022] According to the above structure, since two second metal plates 22 are provided, one of the second metal plates 22 deforms towards the hook and the other deforms towards the inner wall of the outer shell 1. When the side wall of the second metal plate 22 contacts the inner wall of the outer shell 1, it pushes the entire tripping assembly 2 towards the hook, thereby increasing the speed at which the tripping assembly 2 contacts the hook and improving the sensitivity.

[0023] like Figure 3 As shown, the connecting component 3 includes a slide rail 31, with a limit plate 32 symmetrically fixedly connected to one end of the slide rail 31. A metal slider 33 is fixedly connected inside the slide rail 31. The ends of the first metal piece 21 and the second metal piece 22 are fixedly connected to the corresponding metal slider 33. A spring 34 is symmetrically fixedly connected to one side of the metal slider 33. One end of the spring 34 is fixedly connected to one end of the inner wall of the slide rail 31. A support plate 4 is fixedly connected to the inner wall of the outer shell 1. One end of one of the slide rails 31 is fixedly connected to one side of the support plate 4.

[0024] According to the above structure, when one of the second metal pieces 22 contacts the inner wall of the outer casing 1, as the second metal piece 22 continues to expand, the second metal piece 22 pushes the two metal sliders 33 to slide to the right, thereby squeezing the spring 34. The metal sliders 33 slide backward, driving the entire release assembly 2 to move to the right and accelerating the release assembly 2 to move closer to the hook.

[0025] like Figure 3 As shown, a waist-shaped groove 35 is provided on one side of the slide rail 31, and a cylinder 36 is fixedly connected to one end of the metal slider 33. The cylinder 36 passes through the waist-shaped groove 35, and a wire 37 is fixedly welded to one end of the metal slider 33. The wire 37 passes through the cylinder 36.

[0026] According to the above structure, by connecting the two wires 37 to the circuit, the first metal piece 21 and the second metal piece 22 are electrically connected to the wires 37 through the metal slider 33. The cylindrical 36 can protect the wires 37 and prevent the wires 37 from rubbing against the waist-shaped groove 35 when sliding.

[0027] The working principle of this utility model is as follows: When the first metal sheet 21 and the second metal sheet 22 are connected to the circuit, when the current in the circuit is too large, the temperature of the first metal sheet 21 and the second metal sheet 22 will rise. Since the coefficient of thermal expansion of the second metal sheet 22 is greater than that of the first metal sheet 21, the deformation of the second metal sheet 22 is greater than that of the first metal sheet 21 after the temperature rises. Therefore, the bulge of the second metal sheet 22 intensifies. When one side of one of the second metal sheets 22 contacts the hook of the air switch, it pushes the hook, thereby causing the hook to disengage and form an open circuit. Since there are two second metal sheets 22, one of the second metal sheets 22 deforms towards the hook and the other deforms towards the inner wall of the outer casing 1. After the side wall of the plate 22 contacts the inner wall of the outer shell 1, it pushes the entire tripping assembly 2 closer to the hook, thereby increasing the speed at which the tripping assembly 2 contacts the hook and improving the sensitivity. When one of the second metal plates 22 contacts the inner wall of the outer shell 1, as the second metal plate 22 continues to expand, the second metal plate 22 pushes the two metal sliders 33 to slide to the right, thereby squeezing the spring 34. The metal sliders 33 slide backward, driving the entire tripping assembly 2 to move to the right and accelerate the tripping assembly 2 closer to the hook. By connecting the two wires 37 to the circuit, the first metal plate 21 and the second metal plate 22 are electrically connected to the wires 37 through the metal sliders 33. The cylindrical 36 can protect the wires 37 and prevent the wires 37 from rubbing against the waist-shaped groove 35 during sliding.

[0028] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A thermal relay tripping device, comprising a housing (1) and a tripping assembly (2), characterized in that: The tripping assembly (2) is disposed inside the housing (1). The tripping assembly (2) includes a first metal sheet (21) and a second metal sheet (22) with different coefficients of thermal expansion. There are two second metal sheets (22), which are respectively disposed on both sides of the first metal sheet (21). The top and bottom ends of one side of the second metal sheet (22) are respectively fixedly connected to the top and bottom ends of one side of the first metal sheet (21). Both ends of the tripping assembly (2) are provided with connecting assemblies (3), which are fixedly installed inside the housing (1).

2. The thermal relay tripping device according to claim 1, characterized in that: The coefficient of thermal expansion of the second metal sheet (22) is greater than that of the first metal sheet (21).

3. The thermal relay tripping device according to claim 2, characterized in that: The middle part of both second metal sheets (22) is an arc-shaped structure, and the distance between the protruding side of one of the second metal sheets (22) and the inner wall of the outer shell (1) is 1-3 mm.

4. A thermal relay tripping device according to claim 3, characterized in that: The connecting component (3) includes a slide rail (31), one end of which is symmetrically fixedly connected to a limiting plate (32), and a metal slider (33) is fixedly connected inside the slide rail (31). The ends of the first metal piece (21) and the second metal piece (22) are both fixedly connected to the corresponding metal slider (33).

5. A thermal relay tripping device according to claim 4, characterized in that: A spring (34) is symmetrically fixedly connected to one side of the metal slider (33), and one end of the spring (34) is fixedly connected to one end of the inner wall of the slide rail (31).

6. A thermal relay tripping device according to claim 5, characterized in that: A waist-shaped groove (35) is provided on one side of the slide rail (31), and a cylinder (36) is fixedly connected to one end of the metal slider (33). The cylinder (36) passes through the waist-shaped groove (35), and a wire (37) is fixedly welded to one end of the metal slider (33). The wire (37) passes through the cylinder (36).

7. A thermal relay tripping device according to claim 6, characterized in that: The inner wall of the outer shell (1) is fixedly connected to a support plate (4), and one end of one of the slide rails (31) is fixedly connected to one side of the support plate (4).

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