CN101261913B - miniature breaker - Google Patents

Abstract

The invention discloses a microminiature breaker, which utilizes a contact spring to connect two terminals in a circuit, so that the two terminals are electrically connected to communicate the circuit; the contact spring piece is fixedly connected with one terminal, wherein one end of the contact spring piece is a fixed end, the other end of the contact spring piece is a free end, the contact spring piece close to the fixed end bends and extends towards the direction far away from the free end to form an elastic bent arc section, and the elastic bent arc section takes the fixed end as a fulcrum and has elastic restoring force. Therefore, the contact elastic sheet can have elastic force through the arrangement of the elastic arc section, the space length of the contact elastic sheet can be effectively shortened, the size of the contact elastic sheet is reduced, and the purpose of microminiaturizing the breaker is achieved.

Description

miniature breaker

technical field

The invention relates to an electric device, in particular to a miniature breaker. the

Background technique

Generally speaking, in the overall circuit circuit of the power supply and individual switch circuit circuits, electrical components such as fuses, breakers, and thermal relays are used to protect the circuit to prevent wires from igniting due to current overload and overheating, and to ensure electricity safety. . the

In some single electronic and electrical products, such as: high-priced electronic products, information equipment for processing data, or electric heating appliances with high power consumption, the circuit protection of temperature-sensing breakers is usually installed on the power line or inside the body. structure, to protect the single electronic and electrical product, so that the single electronic and electrical product itself can sense and cut off the power in real time when the current is overloaded or the circuit is overheated, so as to prevent the product itself from being burned. At the same time, the setting of the circuit protection structure of the temperature-sensing breaker can avoid the current overload and overheating of individual circuit loops or the overall circuit loop due to problems with a single electronic or electrical product, resulting in individual circuit loops or the overall circuit loop. Other electrical equipment in the device cannot operate. the

The aforementioned existing temperature-sensing breaker used in a single electronic product is usually connected to two terminals with a contact shrapnel to connect the circuit loop. Although the contact shrapnel can be deformed after being heated, bend and bounce in reverse, and the circuit circuit can be disconnected. , so that the contact shrapnel automatically trips and cuts off the power when the current is overloaded and overheated; but these existing temperature-sensing power-off protectors have the following disadvantages

1. The contact shrapnel of the existing temperature-sensing circuit breaker is set in a curved shape, which has the characteristics of being deformed by heat, bending in reverse, and bouncing; no matter when the contact shrapnel is stamped or assembled into a curved arc shape, due to the production, it is impossible to ensure that every contact The thickness, curvature and structural characteristics of the shrapnel are exactly the same, so it is difficult to effectively control the reaction temperature value of the contact shrapnel deformed and reversely bent and bounced after being heated. The value error of the set induction temperature is large, and the quality control is not easy. the

2. The arc-shaped contact shrapnel of the existing temperature-sensing circuit breaker is not sensitive to deformation and reverse bending and bouncing after being heated, and cannot protect the electronic product in time when it is overloaded and overheated.

3. Since the space length and size of the contact shrapnel cannot be reduced, the size and total volume of the existing temperature-sensing circuit breaker are relatively large, and the volume of the power-off protector cannot be reduced. Large-sized and bulky power-off protectors will affect the aesthetics of the product when installed on the power line, and the size of the electrical product will increase when installed inside the electrical appliance. the

4. In the existing temperature-sensing circuit breaker, the manufacturing materials cannot be reduced, and the production cost cannot be reduced. the

Contents of the invention

The purpose of the present invention is to solve the shortcomings of the arc-shaped contact shrapnel of the aforementioned existing temperature-sensing circuit breaker, such as: the reaction temperature value of the contact shrapnel that is deformed by heat and reversely bends and bounces cannot be effectively controlled; the error of setting the induction temperature value is large, It is not easy to control the production quality; the sensitivity is not high, so it cannot be tripped in time when overloaded and overheated, and the power can be cut off to protect electronic products; Relatively bulky; unable to reduce material, or reduce product manufacturing costs. the

The present invention provides a miniature breaker, which includes a box body, a button, and a contact shrapnel; wherein,

The box body is hollow, and at least two contact terminals are arranged in the box body, the first contact terminal is fixedly provided with one end of the contact shrapnel, and the second contact terminal is combined with a second contact point;

The button is a cylinder, the button is movably embedded in the box body, the button can be moved relative to the box body, and the button can abut against one side of the shrapnel;

The contact shrapnel is a bent sheet body, one end of the contact shrapnel is a fixed end, and the fixed end is set at the first contact terminal; the other end of the contact shrapnel is a free end, and the free end is provided with a first contact point;

The contact elastic piece forms an elastic curved arc section near the fixed end, and the elastic curved arc section bends the contact elastic piece in a direction away from the free end, and then bends back to the direction of the free end to form a semi-circular curved arc opening shape;

When the contact elastic piece is heated, the elastic curved section makes the free end of the contact elastic piece stretch outward and bounce, so that the first contact point and the second contact point are in an absolute separation state. the

The miniature breaker of the present invention mainly utilizes the elastic curved section formed by bending and extending the contact elastic piece, so that the contact elastic piece has elastic force through the setting of the elastic curved section, and shortens the space length of the contact elastic piece And size, to achieve the purpose of reducing the volume of the breaker. the

Secondly, an elastic curved section is provided in contact with the shrapnel, with the center of the curved arc of the elastic curved section as the axis, and in accordance with the geometric relationship of angular displacement, when the elastic curved section is heated and deformed, and is displaced by an arc angle , the free end of the contact shrapnel and the first contact will be relatively displaced by a large distance, through the relatively enlarged displacement distance to ensure that the first contact and the second contact are in an absolute separation state, and there is no electric field connection, making the circuit loop absolute. power-off state to ensure the safety of electricity use. the

Thirdly, the contact shrapnel set by the breaker has elastic force through the setting of the elastic bending section, instead of using stamping or assembling into a curved arc shape to achieve the function of deformation and reverse bending and bouncing after heating, which can effectively control the contact shrapnel when heated. The reaction temperature value of post-deformation and bounce, the set induction temperature is accurate, and the quality control is easy. the

Finally, the arrangement of the elastic curved section makes the contact shrapnel have an elastic recovery force. The overall structure is simple and easy to manufacture, which can meet the demand for miniaturization of the volume, and the material required for the structure of the breaker is reduced, which can effectively reduce the production cost. cost. the

Fig. 1 is an exploded perspective view of an embodiment of a micro-breaker according to the present invention;

Description of drawings

Fig. 2 is the combined cross-sectional view of the embodiment of the miniature breaker according to the present invention, which shows the state of the circuit circuit being de-energized;

Fig. 3 is another combined cross-sectional view of the embodiment of the micro-breaker according to the present invention, which shows the state of the circuit loop conduction;

FIG. 4 is a partially enlarged view of FIG. 3 , showing a schematic diagram of the contact shrapnel being stretched, deformed and tripped when the current is overloaded or the circuit is overheated. the

Among them, the reference signs are explained as follows:

1 box body 10 grooves

101 Upper notch 102 Lower notch

11 first contact terminal 111 raised part

12 second contact terminal 121 second contact

13 first slot 14 second slot

2 buttons 21 expansion end

22 concave ring neck 23 elastic element

3 contact shrapnel 30 perforation

31 The first contact point 32 Elastic curved section

33 Lugs 34 Curved Shrapnels

341 buttonhole 342 slot

35 adjusting screw 351 ring concave neck

In order to disclose the purpose, features and effects of the present invention in detail, the present invention will be described in detail through the following specific embodiments and accompanying drawings. the

Detailed ways

Figure 1 is an exploded perspective view of the miniature breaker according to the embodiment of the present invention, and Figures 2 and 3 are two combined cross-sectional views of the miniature breaker according to the embodiment of the present invention. The present invention is a miniature breaker, which It includes a box body 1, a button 2, and a contact shrapnel 3; among them,

The box body 1 is hollow, and the box body 1 is provided with a groove 10. The upper and lower sides of the groove 10 are respectively provided with an upper concave notch 101 and a lower concave notch 102; the bottom surface of the box body 1 is provided with at least two contact terminals. In this embodiment, there are two contact terminals, which are the first and second contact terminals 11 and 12, which are respectively inserted into the first and second slots 13 and 14 below the box body 1, and the upper part of the first contact terminal 11 is bent And it is fixedly arranged on one end of the contact spring 3 , a raised portion 111 is arranged under the first contact terminal 11 , and a second contact 121 is combined above the second contact terminal 12 . the

The button 2 is a cylinder, and the bottom end of the button 2 is a cap-shaped enlarged end 21; the button is provided with a concave ring neck 22, and the diameter of the concave ring neck 22 is smaller than the diameter of the button 2 cylinder; an elastic element 23 is set on the concave ring neck 22 of the button 2. In this embodiment, the elastic element 23 is a coil spring; when assembled, the button 2 is movably embedded in the upper concave gap 101 of the groove 10 of the aforementioned box body 1, The concave ring neck 22 of the button 2 is movably embedded in the concave notch 102, the elastic element 23 is located between the concave notch 102 and the enlarged end 21 and has an elastic force to stretch outwards, the button 2 can be placed in the groove 10 of the box body 1 The upper concave notch 101 and the lower concave notch 102 move up and down, and the button 2 can abut against the upper side of the contact elastic piece 3 . the

The contact elastic piece 3 is a bent sheet body, one end (ie the lower end) of the contact elastic piece 3 is a fixed end, and the fixed end of the contact elastic piece 3 is fixedly connected with the first contact terminal 11, see also Fig. 2 and Fig. 3 , In this embodiment, the fixed end of the contact elastic piece 3 is provided with a perforation 30 set on the protrusion 111 of the first contact terminal 11 and is inserted into the first slot 13 below the box body 1 to be fixed; the contact elastic piece The other end of 3 is a free end, and the first contact 31 is provided on the free end. The contact elastic piece 3 forms an elastic curved section 32 near the fixed end, and the elastic curved section 32 bends the contact elastic piece 3 to a direction away from the free end, and then bends back to the direction of the free end to form a semi-circular curved arc opening shape The entire section of the elastic curved section 32 is a heated deformation zone and has an elastic restoring force. Through the setting of the elastic curved section 32, the contact elastic piece 3 has elastic force and can stretch outwards and bounce after being heated; at the same time, the elastic curved section The arc center of the segment 32 is the axis, and in accordance with the geometrical relationship of the angular displacement, when the elastic arc segment 32 is thermally deformed, opens an arc angle and displaces a small distance, the first contact 31 that contacts the free end of the shrapnel 3 is relatively displaced. A large distance, of course, when the elastic curved section 32 closes an arc angle and displaces a short distance, the first contact point 31 contacting the free end of the shrapnel 3 also relatively displaces a large distance. The contact spring 3 can be a composite metal sheet. the

The fixed end of the contact spring 3 can also be directly riveted to the first contact terminal 11 by a rivet. the

In addition, referring to Fig. 1, Fig. 2 and Fig. 3, in the embodiment of the present invention, a protruding piece 33 is provided at the free end of the contact elastic piece 3, and the protruding piece 33 is movably fastened to a buckle hole 341 of an arc-shaped elastic piece 34, The other end of the arc-shaped shrapnel 34 is movably embedded in the ring concave neck 351 of an adjusting screw 35 with a groove 342. The adjusting screw 35 is installed in the box body 1 and the ring concave neck 351 of the adjusting screw 35 is in the box body. 1 is exposed inside, by adjusting the displacement of the adjustment screw 35, the arc-shaped elastic piece 34 has an appropriate elastic force, and when the contact elastic piece 3 bounces upward, it can be guaranteed to be stretched and positioned in the jump-off state. the

The present invention is in the implementation state of general power-off and power-on, as shown in Figure 2 and Figure 3; when the button 2 is pressed downward, the enlarged end 21 at the lower end of the button 2 presses against the contact spring 3 downward, so that the first contact spring 3 A contact point 31 is in contact with the second contact point 121 of the second contact terminal 12 downwards to form a circuit connection state, as shown in FIG. 3 . the

When the current is overloaded or the circuit circuit is overheated, the contact shrapnel 3 is heated, and the elastic curved arc section 32 is heated and deformed, opening an arc angle and displacing for a certain distance. Referring to Fig. 4, the free end of the contact shrapnel 3 stretches upward, and the first contact point 31 is relatively displaced A large distance and bounce upwards, the displacement distance of the first contact 31 can ensure that the first contact 31 and the second contact 121 are in an absolute separation state, and there is no electric field connection to ensure the power-off state of the circuit loop, such as As shown in FIG. 2 , at this moment, the first contact point 31 pushes the enlarged end 21 of the button 2 to make the button 2 upward. the

The above described the present invention in detail through specific embodiments, but the above descriptions are only preferred embodiments of the present invention, and cannot limit the implementation scope of the present invention. That is, all similar changes and modifications made according to the application scope of the present invention should still fall within the scope of patent protection of the present invention. the

Claims (7)

1. A micro-breaker, which includes a box body, a button, and a contact shrapnel; wherein, The box body is hollow, and at least two contact terminals are arranged in the box body, the first contact terminal is fixedly arranged at one end of the contact spring, and the second contact terminal is combined with a second contact point; The button is a cylinder, the button is movably embedded in the box body, the button can be moved relative to the box body, and the button can be in contact with one side of the shrapnel; The contact elastic piece is a bent sheet body, one end of the contact elastic piece is a fixed end, and the fixed end is arranged on the first contact terminal; the other end of the contact elastic piece is a free end, and the free end is provided with a first contact; It is characterized in that the contact elastic piece forms an elastic curved arc section near the fixed end, and the elastic curved arc section bends and extends the contact elastic piece in a direction away from the free end, and then bends back to the direction of the free end to form a semi-circular curved arc opening shape; When the contact elastic piece is heated, the elastic curved section makes the free end of the contact elastic piece stretch outward and bounce, so that the first contact point and the second contact point are in an absolute separation state. 2. The micro-breaker according to claim 1, wherein the box body is provided with a groove, and the upper and lower sides of the groove are respectively provided with an upper concave notch and a lower concave notch; The bottom end of the button cylinder is a cap-shaped enlarged end; the button is provided with a concave ring neck, and the diameter of the concave ring neck is smaller than the diameter of the button cylinder; an elastic element is sleeved on the concave ring neck of the button ; The button is movably embedded in the upper notch of the groove of the box body, the concave ring neck of the button is movably embedded in the lower notch, and the elastic element is located between the lower notch and the enlarged end and has the elasticity to stretch outwards. force. 3. The miniature breaker according to claim 2, wherein the elastic element is a coil spring. 4. The miniature breaker according to claim 1, wherein the first and second contact terminals are respectively inserted into the first and second slots below the box body. 5 . The miniature breaker according to claim 4 , wherein the fixed end of the contact spring and the first contact terminal are jointly inserted into the first slot below the box body to be fixed. 6 . 6. The miniature breaker according to claim 1, wherein the fixed end of the contact spring is directly riveted to the first contact terminal. 7. The miniature breaker according to claim 1, wherein the contact spring is a composite metal sheet.

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