CN2603558Y

CN2603558Y - Thermal-expansion type junction box

Info

Publication number: CN2603558Y
Application number: CN 02249075
Authority: CN
Inventors: 柯航
Original assignee: DONGGUAN XILUN ELECTRIC APPLIANCES
Current assignee: DONGGUAN XILUN ELECTRIC APPLIANCES
Priority date: 2002-11-01
Filing date: 2002-11-01
Publication date: 2004-02-11
Anticipated expiration: 2012-11-01

Abstract

The utility model relates to the electrical equipment technological area, specifically to a thermal prevention expansion terminal box. The technical scheme is that: The box cover and the box body are connected by bolts, the outer surface of the box cover is an arced surface with the middle part slightly extrudes outwards. The outer surface of the box cover is an arc surface with the middle part slightly convex outwards after the device is used, so when the terminal box is under heat to expand, the direction of generated extrusion stress is along the protruding direction of the box cover, the bending degree of the arced surface of the box cover increases outwards under the stress, thus overcomes the gap or even the cracked situation generated because of the expansion under heat, and effectively eliminates the hidden safety troubles of the circuit short aroused by rain water infiltrating into the terminal box existed in previous products.

Description

A kind of heat expansion-proof type terminal box

Technical field:

The utility model relates to the electric equipment technical field, refers in particular to a kind of heat expansion-proof type terminal box.

Background technology:

In the circuit of electric equipment connects, often use terminal box, in case the generation of leak-stopping electricity situation guarantees that it is safe in utilization.Generally, consider that terminal box adopts plastic material to make more from the angle of safety and cost.In the process of circuit energising work, because the heat of its generation can make the temperature of terminal box raise, and the thermal expansion that causes terminal box is out of shape, make the inner extrusion stress that produces of terminal box, see accompanying drawing 1, this is that present a common terminal box is at thermal expansion lower stress analysis chart, because at present the lid 31 of terminal box mostly is one plate shaped, so, the direction of the extrusion stress T that produces during its expanded by heating is along lid 31 parallel scattering, cause lid 31 along continuous straight runs to stretch, so just cause the space increase that cooperates between lid 31 and the box body 32.Two ends owing to lid 31 are fixed on the box body 32 simultaneously, the scope of its stretching is restricted, be easy to cause lid 31 to break in this case, and space or crack make rainwater infiltrate easily in the terminal box, and the potential safety hazard of line short occurs owing to expanding.

Summary of the invention:

The purpose of this utility model is to provide a kind of terminal box that can effectively overcome thermal expansion stress.

The utility model is achieved by the following technical solution: lid is connected by screw with box body, and the outer surface of lid is that a pars intermedia omits the cambered surface to outer lug.

After adopting this device, because being a pars intermedia, the outer surface of lid omits cambered surface to outer lug, so when the terminal box expanded by heating, the direction of the extrusion stress of its generation is the direction along the lid projection, make lid under this stress, outwards strengthen the degree of crook of cambered surface, thereby overcome the space that cooperates between lid and the box body owing to expanded by heating increases, or caused the situation that it breaks, effectively eliminated the potential safety hazard that exists owing to expanding.

Description of drawings:

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is the thermal expansion force analysis figure of existing terminal box lid;

Fig. 2 is a stereogram of the present utility model;

Fig. 3 is a three-dimensional exploded view of the present utility model;

Fig. 4 is the thermal expansion force analysis figure of the utility model lid.

Embodiment:

See accompanying drawing 2,3, the utility model comprises: lid 1 and box body 2, lid 1 is connected by screw 3 with box body 2, its concrete connected mode is: offer some through holes 12 on the lid 1, be provided with in the box body 2 and the corresponding bearing pin 21 of through hole, screw 3 passes through hole 12 and is threaded with bearing pin 21, thereby lid 1 and box body 2 are coupled together.Through hole 12 is asymmetric distribution, adopts asymmetrically distributed advantage to be: it is unique to make that lid 1 and box body 2 closure between straight becomes, and prevents wrong mounting means.

The outer surface 11 of lid 1 is that a pars intermedia omits the cambered surface to outer lug.Lid 1 adopts plastic material to make with box body 2 in addition.

See accompanying drawing 4, this is that the utility model lid 1 is at expanded by heating lower stress analysis chart, because being a pars intermedia, the outer surface 11 of the lid 1 of terminal box omits cambered surface to outer lug, so when terminal box lid 1 expanded by heating, the direction of the extrusion stress F of its generation is the direction along lid 1 outer surface 11 projections, make lid 1 under this stress, outwards strengthen the degree of outer surface 11 cambered surface bendings, the deformation of lid 1 is discharged thus, thereby overcome the space that cooperates between lid 1 and the box body 2 owing to expanded by heating increases, or, effectively eliminated the potential safety hazard that exists owing to expansion causes the situation that it breaks.

Claims

1, a kind of heat expansion-proof type terminal box comprises: lid (1) and box body (2), lid (1) is connected by screw (3) with box body (2), it is characterized in that: the outer surface (11) of lid (1) is that a pars intermedia omits the cambered surface to outer lug.

2, a kind of heat expansion-proof type terminal box according to claim 1, it is characterized in that: offer some through holes (12) on the lid (1), be provided with in the box body (2) and the corresponding bearing pin of through hole (21), screw (3) passes through hole (12) and is threaded with bearing pin (21), and through hole (12) is asymmetric distribution.

3, a kind of heat expansion-proof type terminal box according to claim 1 is characterized in that: lid (1) adopts plastic material to make with box body (2).