阅读说明：本技术 一种小型过流过热保护器 (Small-size overcurrent and overheat protector ) 是由 伍为国 蔡从胜 于 2020-04-24 设计创作，主要内容包括：本申请公开了一种小型过流过热保护器,包括一端开口的外壳(1)和封装于外壳(1)开口上的底板,外壳(1)内设置有内部绝缘层(3),内部绝缘层(3)贴合于外壳(1)的内壁上并与外壳(1)的形状配合设置；所述内部绝缘层(3)内设置有双金属片(4),双金属片(4)的一端固定设置于内部绝缘层(3)的侧壁上,双金属片(4)的另一端设置有动触点一(5)；所述内部绝缘层(3)内设置有滑动金属片(6),滑动金属片(6)与内部绝缘层(3)相对滑动设置。本发明的优点在于：通过感温部件驱动滑动驱动装置,使得过流过热保护器内部的两个触点在发生轻微黏连时能够有效的脱离接触,保证过流过热保护器的动作可靠。(The application discloses a small-sized overcurrent and overheat protector, which comprises a shell (1) with an opening at one end and a bottom plate packaged on the opening of the shell (1), wherein an internal insulating layer (3) is arranged in the shell (1), and the internal insulating layer (3) is attached to the inner wall of the shell (1) and is matched with the shape of the shell (1); a bimetallic strip (4) is arranged in the internal insulating layer (3), one end of the bimetallic strip (4) is fixedly arranged on the side wall of the internal insulating layer (3), and the other end of the bimetallic strip (4) is provided with a first movable contact (5); a sliding metal sheet (6) is arranged in the internal insulation layer (3), and the sliding metal sheet (6) and the internal insulation layer (3) are arranged in a sliding mode. The invention has the advantages that: the sliding driving device is driven by the temperature sensing component, so that two contacts in the overcurrent and overheat protector can be effectively separated from contact when being slightly adhered, and the reliable action of the overcurrent and overheat protector is ensured.)

1. A small-size overcurrent and overheat protector is characterized in that: the insulation structure comprises a shell (1) with an opening at one end and a bottom plate packaged on the opening of the shell (1), wherein an internal insulation layer (3) is arranged in the shell (1), and the internal insulation layer (3) is attached to the inner wall of the shell (1) and is matched with the shell (1) in shape; a bimetallic strip (4) is arranged in the internal insulating layer (3), one end of the bimetallic strip (4) is fixedly arranged on the side wall of the internal insulating layer (3), and the other end of the bimetallic strip (4) is provided with a first movable contact (5); a sliding metal sheet (6) is arranged in the internal insulating layer (3), the sliding metal sheet (6) and the internal insulating layer (3) are arranged in a relatively sliding manner, and a second movable contact (7) matched with the first movable contact (5) is arranged on the sliding metal sheet (6); the backplane comprises a first conductive backplane (22), a second conductive backplane (24); the moving contact I (5) is electrically connected with the second conductive bottom plate (24), and the moving contact II (7) is electrically connected with the first conductive bottom plate (22); a sliding driving device for driving the sliding metal sheet (6) to slide is fixedly arranged in the shell (1), a temperature sensing part (13) which is conducted along with the temperature rise is arranged on the bimetallic sheet (4), and the temperature sensing part (13) is connected in series in a control loop of the sliding driving device.

2. The small overcurrent and overheat protector according to claim 1, wherein: the bottom plate further comprises an internal insulation bottom plate (21), a conductive insulation bottom plate (23) and an external insulation bottom plate (25), the internal insulation bottom plate (21) is arranged in the opening of the shell (1), the upper surface of the internal insulation bottom plate (21) faces the inside of the shell (1), the first conductive bottom plate (22), the conductive insulation bottom plate (23), the second conductive bottom plate (24) and the external insulation bottom plate (25) are sequentially attached to the lower surface of the internal insulation layer (3), and the sliding driving device is arranged on the internal insulation bottom plate (21).

3. The small overcurrent and overheat protector according to claim 2, wherein: the inner insulation bottom plate (21) is further provided with an inner guide plate (26), one end of the sliding metal sheet (6) is in sliding connection with one inner side wall of the inner insulation layer (3), the other end of the sliding metal sheet (6) is in sliding connection with the inner guide plate (26), the inner guide plate (26) is perpendicular to the inner insulation bottom plate (21), and the inner side wall of the inner insulation layer (3) in sliding connection with the sliding metal sheet (6) is parallel to the inner guide plate (26); the inner guide plate (26) is provided with a through hole for the bimetallic strip (4) to pass through.

4. The small overcurrent and overheat protector according to claim 3, wherein: the two ends of the sliding metal sheet (6) are respectively provided with a sliding head (61), sliding grooves which are matched with the sliding heads (61) are respectively arranged on the inner guide plate (26) and the inner side wall of the inner insulation bottom plate (21), and the length extending direction of the sliding grooves is perpendicular to the inner insulation bottom plate (21).

5. The small overcurrent and overheat protector according to claim 4, wherein: the sliding metal sheet (6) is arc-shaped, and an arc-shaped opening of the sliding metal sheet (6) is arranged towards the bottom plate; the sliding head (61) and the sliding metal sheet (6) are arranged in an insulating mode, and the second moving contact (7) is electrically connected with the sliding metal sheet (6).

6. The small overcurrent and overheat protector according to claim 2, wherein: the sliding driving device comprises a cylindrical electromagnet (8), a metal suction head (81) and a sliding support spring (82), wherein the metal suction head (81) is arranged on the surface of the sliding metal sheet (6) facing to the internal insulation bottom plate (21), the metal suction head (81) and the sliding metal sheet (6) are arranged in an insulation manner, the electromagnet (8) is fixedly arranged on the internal insulation bottom plate (21) and is positioned below the metal suction head (81), one end of the sliding support spring (82) is sleeved on the metal suction head (81) and is in contact with the sliding metal sheet (6), and the other end of the sliding support spring (82) is sleeved on the electromagnet (8) and is in contact with the internal insulation bottom plate (21); the surface of the sliding supporting spring (82) is subjected to insulation treatment; the temperature sensing component (13) is connected with a lead winding of the electromagnet (8) in series.

7. The small overcurrent and overheat protector according to claim 5, wherein: the temperature sensing part (13) is one of a thermistor and a thermal sensitive ceramic, and the surface of the temperature sensing part (13) is attached to the surface of the bimetallic strip (4); an internal conducting strip (12) is arranged in the external insulation bottom plate (25), and the temperature sensing part (13) is connected with a wire winding of the electromagnet (8) in series through the internal conducting strip (12).

8. The small excess current and excess heat protector of claim 6, wherein: the inner wall of the inner insulating layer (3) is provided with a heat conduction cavity (9), one end, fixed on the side wall of the inner insulating layer (3), of the bimetallic strip (4) is arranged in the heat conduction cavity (9), the temperature sensing part (13) is arranged in the heat conduction cavity (9), and the heat conduction cavity (9) is filled with heat conduction silicone grease.

9. The small excess current and excess heat protector of claim 6, wherein: a tension spring (10) is arranged between the internal insulating layer (3) and the bimetallic strip (4), the tension spring (10) is a memory metal spring, one end of the tension spring (10) is fixed with the internal insulating layer (3), and the other end of the tension spring (10) is fixed with the bimetallic strip (4); a buffer pad (11) is arranged on the inner insulating layer (3) and the bimetallic strip (4) respectively, and two ends of the tension spring (10) are sleeved on the buffer pad (11) on the inner insulating layer (3) and the buffer pad (11) on the bimetallic strip (4) respectively.

Technical Field

The invention relates to a small overcurrent and overheat protector, and belongs to the field of electronic equipment.

Background

The overcurrent and overheat protector is formed by combining two different alloys, generates heat after current flows, and is disconnected due to the fact that the two different alloys have different thermal expansion coefficients and tend to bend towards one direction and the contact leaves. The bending speed is proportional to the magnitude of the current passing through it. This protects the consumer. Two inside contacts of current overcurrent overheat protector, under the condition that the current flows, the separation of two inside contacts can only be realized through the crooked separation that realizes of the inflation after bimetallic strip is heated, when overcurrent overheat protector takes place the condition of overflowing when many, the condition of slightly gluing can take place for two inside contacts, the joining force between two inside contacts increases, the crooked probably can't make two inside contacts break away from the contact through the inflation after bimetallic strip is heated, thereby can't realize overcurrent protection, the use of overcurrent overheat protector has been influenced.

Disclosure of Invention

The technical scheme provided by the invention provides the small overcurrent and overheat protector which can effectively realize heat dissipation in the photovoltaic outgoing junction box, so that the stability and safety of elements in the junction box are greatly improved.

In order to solve the technical problem, the invention adopts the technical scheme that the small-sized over-current and over-heat protector comprises a shell with an opening at one end and a bottom plate packaged on the opening of the shell, wherein an internal insulating layer is arranged in the shell and is attached to the inner wall of the shell and is matched with the shape of the shell; a bimetallic strip is arranged in the internal insulating layer, one end of the bimetallic strip is fixedly arranged on the side wall of the internal insulating layer, and the other end of the bimetallic strip is provided with a first movable contact; a sliding metal sheet is arranged in the internal insulating layer, the sliding metal sheet and the internal insulating layer are arranged in a sliding mode, and a second movable contact matched with the first movable contact is arranged on the sliding metal sheet; the bottom plate comprises a first conductive bottom plate and a second conductive bottom plate; the first moving contact is electrically connected with the second conductive bottom plate, and the second moving contact is electrically connected with the first conductive bottom plate; a sliding driving device for driving the sliding metal sheet to slide is fixedly arranged in the shell, a temperature sensing part which is conducted along with the temperature rise is arranged on the bimetallic sheet, and the temperature sensing part is connected in series in a control loop of the sliding driving device.

In the technical scheme of this application, the movable contact on the bimetallic strip is with the movable contact two on the slip sheetmetal cooperation settings, and when taking place to overflow, the bimetallic strip generates heat, and the different emergence of two kinds of different alloy thermal expansion coefficients of bimetallic strip is crooked for movable contact one breaks away from with movable contact two. If the first moving contact and the second moving contact are not separated, the temperature sensing part with the positive temperature coefficient on the bimetallic strip is heated and conducted, so that the sliding driving device drives the sliding metal strip to slide towards the direction far away from the bimetallic strip, and the first moving contact and the second moving contact are forcibly separated, thereby preventing the failure of the overcurrent and overheat protector caused by the fact that the first moving contact and the second moving contact are not adhered and separated.

Optimized, above-mentioned small-size excessive heat protector that overflows, the bottom plate still includes internal insulation bottom plate, electrically conductive insulating bottom plate and external insulation bottom plate, and internal insulation bottom plate sets up in the opening of shell and inside the upper surface of internal insulation bottom plate is towards the shell, and first electrically conductive bottom plate, electrically conductive insulating bottom plate, the electrically conductive bottom plate of second and external insulation bottom plate laminate in proper order on the lower surface of internal insulation layer, and slide actuator sets up on internal insulation bottom plate.

In this application, the opening of inside insulating bottom plate shutoff shell, inside insulating layer for the inside part of shell is insulating with the outside, the inside part of protective housing.

Preferably, in the small overcurrent and overheat protector, the internal insulation bottom plate is further provided with an internal guide plate, one end of the sliding metal sheet is slidably connected with one of the internal side walls of the internal insulation layer, the other end of the sliding metal sheet is slidably connected with the internal guide plate, the internal guide plate is perpendicular to the internal insulation bottom plate, and the internal side wall of the internal insulation layer slidably connected with the sliding metal sheet is parallel to the internal guide plate; the inner guide plate is provided with a through hole for the bimetallic strip to pass through.

In this application, the both ends of slip sheetmetal slide with one of them inside lateral wall, the inside deflector of inside insulating layer respectively for the slip sheetmetal can slide to the direction of keeping away from the bimetallic strip under the drive of slip drive arrangement, makes movable contact one and movable contact two can break away from.

Preferably, the two ends of the sliding metal sheet are respectively provided with a sliding head, the inner guide plate and the inner side wall of the inner insulating bottom plate are respectively provided with a sliding groove matched with the sliding head, and the length extending direction of the sliding groove is perpendicular to the inner insulating bottom plate.

In this application, through the slider and the spout cooperation at slip sheetmetal both ends, lead the slip of slip sheetmetal, prevent that the slip sheetmetal from taking place the skew and influencing the contact cooperation of moving contact one and moving contact two at the slip in-process.

Preferably, in the small overcurrent and overheat protector, the sliding metal sheet is arc-shaped, and an arc-shaped opening of the sliding metal sheet is arranged towards the bottom plate; the sliding head is arranged in an insulating mode with the sliding metal sheet, and the second moving contact is electrically connected with the sliding metal sheet.

In this application, set up the slip sheetmetal into the arc, after the installation of slip sheetmetal, through the elasticity restoring force of slip sheetmetal self for the sliding head can and the spout between the contact pressure increase, prevent that the sliding head from deviating from the spout, guarantee the sliding fit of sliding head and spout.

Preferably, in the small overcurrent and overheat protector, the sliding driving device includes a cylindrical electromagnet, a metal suction head and a sliding support spring, the metal suction head is arranged on the surface of the sliding metal sheet facing the internal insulation base plate, the metal suction head is arranged in an insulation manner with the sliding metal sheet, the electromagnet is fixedly arranged on the internal insulation base plate and is located below the metal suction head, one end of the sliding support spring is sleeved on the metal suction head and is in contact with the sliding metal sheet, and the other end of the sliding support spring is sleeved on the electromagnet and is in contact with the internal insulation base plate; the surface of the sliding support spring is subjected to insulation treatment; the temperature sensing component is connected with a lead winding of the electromagnet in series.

In this application, through the metal suction head on the electro-magnet attraction slip sheetmetal for the slip sheetmetal can remove to the direction of keeping away from the bimetallic strip when overflowing, and then makes movable contact one and movable contact two can break away from the contact. After the power of the wire winding of the electromagnet is cut off, the attraction of the electromagnet to the metal sucker disappears, the sliding metal sheet is reset under the pushing of the sliding supporting spring, and the first movable contact is in contact with the second movable contact to enable the overcurrent and overheat protector to be conducted.

Preferably, in the small overcurrent and overheat protector, the temperature sensing part is one of a thermistor and a thermal sensitive ceramic, and the surface of the temperature sensing part is attached to the surface of the bimetallic strip; an internal conducting strip is arranged in the external insulation bottom plate, and the temperature sensing component is connected with the wire winding of the electromagnet in series through the internal conducting strip.

In this application, the temperature sensing part is thermistor, thermal ceramic, laminates the temperature sensing part in the surface of bimetallic strip for the temperature rise that the temperature sensing part can be timely after the bimetallic strip generates heat keeps the sensitivity.

Preferably, the small overcurrent and overheat protector is characterized in that a heat conducting cavity is formed in the inner wall of the inner insulating layer, one end, fixed to the side wall of the inner insulating layer, of the bimetallic strip is arranged in the heat conducting cavity, the temperature sensing component is arranged in the heat conducting cavity, and heat conducting silicone grease is filled in the heat conducting cavity.

In this application, the tip and the temperature sensing part of bimetallic strip all set up in the heat conduction cavity, and the heat conduction cavity can prevent that the heat of bimetallic strip from scattering and disappearing can't conducting to the temperature sensing part, keeps the temperature sensing sensitivity of temperature sensing part.

Preferably, in the small overcurrent and overheat protector, a tension spring is arranged between the internal insulating layer and the bimetallic strip, the tension spring is a memory metal spring, one end of the tension spring is fixed to the internal insulating layer, and the other end of the tension spring is fixed to the bimetallic strip; the double-metal piece is provided with a double-metal piece, and the double ends of the tension spring are sleeved on the double-metal piece and the double-metal piece respectively.

In this application, memory metal matter tension spring between internal insulation layer and the bimetallic strip makes the temperature rise back in the overheated protector that overflows at bimetallic strip temperature rise, and tension spring is heated and produces the memory deformation, moves the tip of bimetallic strip to the direction of keeping away from the slip sheetmetal for movable contact one can in time break away from with movable contact two.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention.

Detailed Description

The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

As shown in the figure, the invention is a small-sized overcurrent and overheat protector, which comprises a shell 1 with an opening at one end and a bottom plate packaged on the opening of the shell 1, wherein an internal insulating layer 3 is arranged in the shell 1, and the internal insulating layer 3 is attached to the inner wall of the shell 1 and is matched with the shape of the shell 1; a bimetallic strip 4 is arranged in the internal insulating layer 3, one end of the bimetallic strip 4 is fixedly arranged on the side wall of the internal insulating layer 3, and the other end of the bimetallic strip 4 is provided with a movable contact 5; a sliding metal sheet 6 is arranged in the internal insulating layer 3, the sliding metal sheet 6 and the internal insulating layer 3 are arranged in a relatively sliding mode, and a second movable contact 7 matched with the first movable contact 5 is arranged on the sliding metal sheet 6; the backplane comprises a first conductive backplane 22, a second conductive backplane 24; the moving contact I5 is electrically connected with the second conductive bottom plate 24, and the moving contact II 7 is electrically connected with the first conductive bottom plate 22; a sliding driving device for driving the sliding metal sheet 6 to slide is fixedly arranged in the shell 1, a temperature sensing part 13 which is conducted along with the temperature rise is arranged on the bimetallic sheet 4, and the temperature sensing part 13 is connected in series in a control loop of the sliding driving device.

In the technical scheme of this application, movable contact one 5 on bimetallic strip 4 and movable contact two 7 on the sliding metal piece 6 cooperate the setting, and when taking place to overflow, bimetallic strip 4 generates heat, and the different emergence of two kinds of different alloy thermal expansion coefficients of bimetallic strip 4 is crooked for movable contact one 5 breaks away from with movable contact two 7. If the first moving contact 5 and the second moving contact 7 are not separated, the temperature sensing part 13 with positive temperature coefficient on the bimetallic strip 4 is heated and conducted, so that the sliding driving device drives the sliding metal strip 6 to slide towards the direction far away from the bimetallic strip 4, and the first moving contact 5 and the second moving contact 7 are forcibly separated, thereby preventing the failure of the overcurrent and overheat protector caused by the fact that the first moving contact 5 is not adhered to the second moving contact 7 to be separated.

The bottom plate further comprises an internal insulation bottom plate 21, a conductive insulation bottom plate 23 and an external insulation bottom plate 25, the internal insulation bottom plate 21 is arranged in the opening of the shell 1, the upper surface of the internal insulation bottom plate 21 faces the inside of the shell 1, the first conductive bottom plate 22, the conductive insulation bottom plate 23, the second conductive bottom plate 24 and the external insulation bottom plate 25 are sequentially attached to the lower surface of the internal insulation layer 3, and the sliding driving device is arranged on the internal insulation bottom plate 21.

In the present application, the internal insulating bottom plate 21 blocks the openings of the housing 1 and the internal insulating layer 3, so that the components inside the housing 1 are insulated from the outside and protected from the components inside the housing 1.

An inner guide plate 26 is further arranged on the inner insulating bottom plate 21, one end of the sliding metal sheet 6 is in sliding connection with one inner side wall of the inner insulating layer 3, the other end of the sliding metal sheet 6 is in sliding connection with the inner guide plate 26, the inner guide plate 26 is perpendicular to the inner insulating bottom plate 21, and the inner side wall of the inner insulating layer 3 in sliding connection with the sliding metal sheet 6 is parallel to the inner guide plate 26; the inner guide plate 26 is provided with a through hole through which the bimetal 4 passes.

In this application, two ends of the sliding metal sheet 6 respectively slide with one of the inner side walls of the inner insulating layer 3 and the inner guide plate 26, so that the sliding metal sheet 6 can slide in a direction away from the bimetal 4 under the driving of the sliding driving device, and the movable contact one 5 can be separated from the movable contact two 7.

The two ends of the sliding metal sheet 6 are respectively provided with a sliding head 61, the inner guide plate 26 and the inner side wall of the inner insulating bottom plate 21 are respectively provided with a sliding chute which is matched with the sliding heads 61, and the length extending direction of the sliding chutes is perpendicular to the inner insulating bottom plate 21.

In the application, the sliding heads 61 at the two ends of the sliding metal sheet 6 are matched with the sliding grooves to guide the sliding of the sliding metal sheet 6, so that the sliding metal sheet 6 is prevented from deviating in the sliding process to influence the contact matching of the first movable contact 5 and the second movable contact 7.

The sliding metal sheet 6 is arc-shaped, and an arc-shaped opening of the sliding metal sheet 6 faces the bottom plate; the sliding head 61 is insulated from the sliding metal sheet 6, and the second moving contact 7 is electrically connected with the sliding metal sheet 6.

In this application, set up slip sheetmetal 6 to the arc, after slip sheetmetal 6 installs, through the elastic restoring force of slip sheetmetal 6 self for the sliding head 61 can and the spout between the contact pressure increase, prevent that the sliding head 61 from deviating from the spout, guarantee the sliding fit of sliding head 61 and spout.

The sliding driving device comprises a cylindrical electromagnet 8, a metal suction head 81 and a sliding support spring 82, wherein the metal suction head 81 is arranged on the surface of the sliding metal sheet 6 facing to the internal insulation bottom plate 21, the metal suction head 81 and the sliding metal sheet 6 are arranged in an insulation manner, the electromagnet 8 is fixedly arranged on the internal insulation bottom plate 21 and is positioned below the metal suction head 81, one end of the sliding support spring 82 is sleeved on the metal suction head 81 and is in contact with the sliding metal sheet 6, and the other end of the sliding support spring 82 is sleeved on the electromagnet 8 and is in contact with the internal insulation bottom plate 21; the surface of the sliding support spring 82 is subjected to insulation treatment; the temperature sensing part 13 is connected in series with the wire winding of the electromagnet 8.

In the application, the metal suction head 81 on the sliding metal sheet 6 is sucked by the electromagnet 8, so that the sliding metal sheet 6 can move towards the direction away from the bimetallic strip 4 when the overcurrent occurs, and further the movable contact I5 and the movable contact II 7 can be separated from contact. After the power of the wire winding of the electromagnet 8 is cut off, the attraction of the electromagnet 8 to the metal suction head 81 disappears, the sliding metal sheet 6 is reset under the pushing of the sliding supporting spring 82, and the movable contact I5 is contacted with the movable contact II 7 to enable the overcurrent and overheat protector to be conducted.

The temperature sensing part 13 is one of a thermistor and a thermal sensitive ceramic, and the surface of the temperature sensing part 13 is attached to the surface of the bimetallic strip 4; an internal conducting strip 12 is arranged in the external insulating bottom plate 25, and the temperature sensing part 13 is connected with a wire winding of the electromagnet 8 in series through the internal conducting strip 12.

In this application, temperature sensing part 13 is thermistor, thermal ceramic, laminates temperature sensing part 13 in the surface of bimetallic strip 4 for temperature sensing part 13 can be timely intensification after bimetallic strip 4 generates heat, keeps the sensitivity.

The inner wall of the inner insulating layer 3 is provided with a heat conduction cavity 9, one end of the bimetallic strip 4 fixed on the side wall of the inner insulating layer 3 is arranged in the heat conduction cavity 9, the temperature sensing part 13 is arranged in the heat conduction cavity 9, and the heat conduction cavity 9 is filled with heat conduction silicone grease.

In this application, the tip and the temperature sensing part 13 of bimetallic strip 4 all set up in heat conduction cavity 9, and heat conduction cavity 9 can prevent that the heat of bimetallic strip 4 from scattering and disappearing can't conducting to temperature sensing part 13, keeps the temperature sensing sensitivity of temperature sensing part 13.

A tension spring 10 is arranged between the internal insulating layer 3 and the bimetallic strip 4, the tension spring 10 is a memory metal spring, one end of the tension spring 10 is fixed with the internal insulating layer 3, and the other end of the tension spring 10 is fixed with the bimetallic strip 4; the double-metal sheet tension spring is characterized in that a buffer pad 11 is respectively arranged on the internal insulating layer 3 and the double-metal sheet 4, and two ends of the tension spring 10 are respectively sleeved on the buffer pad 11 on the internal insulating layer 3 and the buffer pad 11 on the double-metal sheet 4.

In this application, memory metal matter tension spring 10 between internal insulation layer 3 and bimetallic strip 4 makes the temperature rise back in the overheat protector that overflows at bimetallic strip 4 temperature rise, and tension spring 10 is heated and is produced the memory and warp, moves bimetallic strip 4's tip to the direction of keeping away from slip sheetmetal 6 for movable contact 5 can in time break away from with movable contact two 7.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.