CN214068677U

CN214068677U - Heavy current protector

Info

Publication number: CN214068677U
Application number: CN202023068195.3U
Authority: CN
Inventors: 石金武
Original assignee: Changzhou Yizhan Electrical Equipment Co Ltd
Current assignee: Changzhou Yizhan Electrical Equipment Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-08-27
Anticipated expiration: 2030-12-18

Abstract

The utility model relates to a heavy current protector of overcurrent at 20-30A scope, including shell and the bottom plate of fixed connection in the shell below, be equipped with insulating paper between shell and the bottom plate, roof department welding has bimetallic strip subassembly in the shell, bimetallic strip subassembly includes active layer and passive layer, the active layer sets up in the passive layer below, stationary blade and thin disk have been welded respectively to the positive and negative that bimetallic strip subassembly one end is close to the shell, the bottom welding of the bimetallic strip subassembly other end has the movable contact, be equipped with the conducting strip in the insulating paper, the welding has the stationary contact who runs through insulating paper on the conducting strip, movable contact and stationary contact are dynamic contact, be equipped with the folder of fixed centre gripping stationary blade on the shell, the stationary blade is used for providing the thermal resistance to bimetallic strip subassembly, the figure of stationary blade is provided with an at least. The utility model discloses can provide electric current and temperature duplicate protection at 20-30A scope for overload current, sensitivity is high, safe and reliable.

Description

Heavy current protector

Technical Field

The utility model relates to an overload protection technical field, concretely relates to heavy current protector.

Background

The current protector is a protection device aiming at overcurrent and overheat in circuit equipment, plays a role of protecting the circuit equipment, is widely applied to equipment such as electrical devices, transformers and the like, forms current breaking through internal elements, and blocks current circulation, has lower sensitivity and poorer safety performance, can only aim at a certain upper limit fixed overcurrent value, cannot be adjusted, and lacks a current type protector with a small volume between 20 and 30A in the current market.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the background art, the utility model provides a heavy current protector, which can provide current and temperature dual protection for the overload current in the range of 20-30A, and has high sensitivity, safety and reliability.

The utility model provides a following technical scheme:

the heavy current protector comprises a shell and a bottom plate fixedly connected below the shell, wherein insulating paper is arranged between the shell and the bottom plate, the top wall of the shell is welded with a bimetallic strip assembly, the bimetallic strip assembly comprises an active layer and a passive layer, the active layer is arranged below the passive layer, a fixing sheet and a thin wafer are respectively welded at one end of the bimetallic strip assembly close to the front side and the back side of the shell, the bottom of the other end of the bimetallic strip component is welded with a movable contact, a conducting strip is arranged in the insulating paper, a static contact penetrating through the insulating paper is welded on the conductive sheet, the movable contact is in dynamic contact with the static contact, the casing is provided with a clamping piece for fixedly clamping the fixing piece, the fixing piece is used for providing thermal resistance for the bimetallic strip assembly, and at least one fixing piece is arranged in the number of the fixing pieces.

Preferably, the bimetal block assembly is a bent piece.

Preferably, the coefficient of expansion of the active layer is greater than the coefficient of expansion of the passive layer.

Preferably, the current value of the overload protection of the large-current protector is 20-30A.

Preferably, the high-current protector further comprises a fixing seat for providing a mounting position for the high-current protector, and the fixing seat integrally fixes the shell and the bottom plate together.

Preferably, the minimum linear distance between the contact part of the static contact and the insulating paper is more than or equal to 3 cm.

Preferably, the thin disc is an electrically and thermally conductive material.

The utility model has the advantages that: the utility model has simple structure and small volume, the double metal sheet component is a bending component, the resistance born by the double metal sheet component when being heated and bent is small, the movable contact and the static contact are quickly separated, and the thin wafer provides a large heat conducting area, thereby accelerating the heat transfer and improving the response sensitivity of the overload protection; the fixing plates are used for providing thermal resistance for the bimetallic strip assembly, and the value of the overload current can be adjusted by adjusting the number of the fixing plates, so that the bimetallic strip can be flexibly applied to the condition that the overload current is in the range of 20-30A.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the present invention viewed from above.

The labels in the figure are: 1-a housing; 101-a clip; 2-a bottom plate; 3-a bimetallic strip assembly; 301-active layer; 302-a passive layer; 4-insulating paper; 5-moving contact; 6-stationary contact; 7-fixing the sheet; 8-thin round piece; 9-a conductive sheet; 10-fixed seat.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present embodiment provides a large current protector with an overcurrent in a range of 20-30A, including a housing 1 and a bottom plate 2 fixedly connected below the housing 1, an insulating paper 4 is disposed between the housing 1 and the bottom plate 2, a bimetal block 3 is welded on an inner top wall of the housing 1, the bimetal block 3 includes an active layer 301 and a passive layer 302, the active layer 301 is disposed below the passive layer 302, a fixing plate 7 and a thin circular plate 8 are respectively welded on one end of the bimetal block 3 near the front and back sides of the housing 1, a movable contact 5 is welded on the bottom of the other end of the bimetal block 3, a conducting plate 9 is disposed in the insulating paper 4, a stationary contact 6 penetrating through the insulating paper 4 is welded on the conducting plate 9, the movable contact 5 and the stationary contact 6 are in dynamic contact, a clamp 101 fixedly clamping the fixing plate 7 is disposed on the housing 1, the fixing plate 7 is used for providing thermal resistance for the bimetal block 3, the number of the fixing pieces 7 is provided with at least one.

In this embodiment, the bimetal block 3 is a bending piece, so that the resistance applied when the bimetal block 3 is heated and bent is small, the movable contact 5 and the stationary contact 6 are quickly separated, and the response sensitivity of the overload protection is improved.

In this embodiment, the coefficient of expansion of the active layer 301 is greater than the coefficient of expansion of the passive layer 302.

In the embodiment, the current value of the overload protection of the large-current protector is 20-30A.

In this embodiment, a fixing base 10 providing a mounting position for the high-current protector is further included, and the fixing base 10 integrally fixes the housing 1 and the bottom plate 2 together.

In the embodiment, the minimum linear distance between the contact part of the static contact 6 and the insulating paper 4 is more than or equal to 3cm, so that the static contact and the insulating paper 4 are separated by a certain distance, and the phenomenon that the insulating paper 4 is burnt and melted to damage the protector due to electric arcs generated when the protector is powered on and powered off is avoided.

In the present embodiment, the thin wafer 8 is made of an electrically and thermally conductive material, and an economical copper sheet can be used to conduct electricity to the current and transfer heat generated by the fixing sheet 7.

The utility model discloses the theory of operation is as follows, when under the non-overcurrent condition, the electric current flows through stationary blade 7 in proper order, bimetallic strip subassembly 3 and thin disk 8, movable contact 5, stationary contact 6, conducting strip 9, when under the overcurrent condition, the thermal resistance rises to the right speed in stationary blade 7, the heat is through the reinforcing transmission of thin disk 8, make bimetallic strip subassembly 3 rise to the temperature fast, take place the internal stress through active layer 301 and passive layer 302 that the coefficient of expansion is different and buckle, the deformation volume of active layer 301 is greater than the deformation volume of passive layer 302, make bimetallic strip subassembly 3 buckle to passive layer 302 one side, movable contact 5 separates with stationary contact 6, reach the purpose of cutting off the circuit, after bimetallic strip subassembly 3 cools off, reset and resume movable contact 5 and stationary contact 6 to contact the overlap joint once more; the value of the overload current can be adjusted by adjusting the number of the fixing sheets 7, and the method can be flexibly applied to the condition that the overload current is in the range of 20-30A.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. Heavy current protector, its characterized in that: comprises a shell (1) and a bottom plate (2) fixedly connected below the shell (1), wherein insulating paper (4) is arranged between the shell (1) and the bottom plate (2), a bimetallic strip assembly (3) is welded at the inner top wall of the shell (1), the bimetallic strip assembly (3) comprises an active layer (301) and a passive layer (302), the active layer (301) is arranged below the passive layer (302), a fixed sheet (7) and a thin wafer (8) are respectively welded at one end of the bimetallic strip assembly (3) close to the front and the back of the shell (1), a movable contact (5) is welded at the bottom of the other end of the bimetallic strip assembly (3), a conductive sheet (9) is arranged in the insulating paper (4), a static contact (6) penetrating through the insulating paper (4) is welded on the conductive sheet (9), and the movable contact (5) and the static contact (6) are in dynamic contact, the clamping piece (101) for fixing and clamping the fixing piece (7) is arranged on the shell (1), the fixing piece (7) is used for providing thermal resistance for the bimetallic strip assembly (3), and at least one fixing piece (7) is arranged in number.

2. A high current protector according to claim 1, wherein: the bimetallic strip assembly (3) is a bending piece.

3. A high current protector according to claim 2, wherein: the coefficient of expansion of the active layer (301) is greater than the coefficient of expansion of the passive layer (302).

4. A high current protector according to claim 1, wherein: the current value of the overload protection of the large-current protector is 20-30A.

5. A high current protector according to claim 1, wherein: the high-current protector is characterized by further comprising a fixed seat (10) providing a mounting position for the high-current protector, and the shell (1) and the bottom plate (2) are integrated and fixed together through the fixed seat (10).

6. A high current protector according to claim 1, wherein: the minimum linear distance between the contact part of the static contact (6) and the insulating paper (4) is more than or equal to 3 cm.

7. A high current protector according to claim 1, wherein: the thin circular sheet (8) is made of an electric and heat conducting material.