CN201766003U

CN201766003U - Fully sealed band switch

Info

Publication number: CN201766003U
Application number: CN2010202732069U
Authority: CN
Inventors: 洪世煜
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-27
Filing date: 2010-07-27
Publication date: 2011-03-16
Anticipated expiration: 2020-07-27

Abstract

The utility model provides a fully sealed band switch which comprises a shaft core, a casing and a rubber-coated base, wherein a brush is riveted at the lower end of the shaft core; a spring slot is arranged at the lower end of the shaft core; a spring and a steel ball are arranged inside the spring slot; a ring-shaped steel ball slot and a stopping slot are arranged inside the casing; a contact piece is arranged inside the rubber-coated base; the shaft core is sleeved on the casing; the steel ball at the lower end of the shaft core is in contact with the ring-shaped steel ball slot inside the casing; the rubber-coated base is butted with the bottom of the casing; the brush at the lower end of the shaft core is in sliding fit with the contact piece inside the rubber-coated base; a first sealing zone (seal structure and sealing member) is arranged between the casing and the shaft core; a second sealing zone (seal structure) is arranged between the rubber-coated base and the casing; and a third sealing zone (seal structure) is arranged between the rubber-coated base and a printed circuit board (PCB).

Description

All-sealed band switch

Technical field

The utility model relates to band switch, mainly is meant a kind of all-sealed band switch.

Background technology

Known band switch structure is bareing construction of switch or half-sealed construction of switch, and its product is the sealing on the rigorous meaning of tool not, specifically describes as follows:

First kind is known that bareing band switch structure, and external terminal links to each other by contact brush in this switch, constitutes a loop, and the axle core drives brush when rotating and rotates, and contact brush jumps on different circuit, thereby reaches the purpose of gear switch.This kind structure is to expose in air because of all parts of loop, so product easily runs rosin scaling powder/dust/impurity etc. when producing and use, influences switch performance and useful life.

Second kind is known that half-sealed band switch structure, specify as follows: this product encloses switch block in product is inner by shell and base and seals, but because of shell and base are manner so sealing surface engages is not very desirable, shell and base also have aperture slit and exterior in addition, so can't reach hermetic effect.This kind semitight mode can prevent that part dust/impurity from entering product inside, but can't reach hermetically sealed/waterproof effect truly all the time, can't use for some comparatively harsh environment (as high humidity/waterproof etc.).

Summary of the invention

What the purpose of this utility model was intended to overcome existing band switch can't adapt to harsh and the rugged environment problem, and a kind of all-sealed band switch is provided.This switch is by being provided with the hermetically-sealed construction at three positions, circuit element all is wrapped in switch inside, be all-sealed structure, can completely cut off extraneous water/gas/dust and other impurity fully, thereby make the suitable environment of product more broad, some abominable environments for use (as high humidity/high dirt/waterproof etc.) all can adapt to.

The realization the technical solution of the utility model is: this all-sealed band switch comprises a core, shell, the encapsulate base, wherein said axle core lower end riveted has brush, axle core lower end also is provided with spring groove, in spring groove, be provided with spring and steel ball, be provided with annular steel bead groove and backstop draw-in groove in the described shell, be provided with contact chip in the described encapsulate base, its axis core retainer plate is contained on the shell, the steel ball of axle core lower end contacts with annular steel bead groove in the shell by spring, the encapsulate base is docked at the bottom of shell, contact chip slips in the brush of axle core lower end and the encapsulate base, wherein between shell and axle core, be provided with first seal area (hermetically-sealed construction and seal), between encapsulate base and shell, be provided with second seal area (hermetically-sealed construction), between encapsulate base and pcb board, be provided with the 3rd seal area (hermetically-sealed construction).

This technical scheme also comprises:

Described first seal area is included in shell and axle is provided with O-ring seal and stop tab between the core, and wherein O-ring seal is sleeved on the core, and the cylindrical of sealing cushion rubber contacts with stop tab, and this stop tab installs in the enclosure the backstop draw-in groove.

Described second seal area is located at the interface between outer casing bottom and the encapsulate base, wherein the interface at outer casing bottom is provided with outer shell flanch, interface at the encapsulate base is provided with the recessed edge of base, described outer shell flanch is plugged on the recessed edge of described base, is one through heating outer shell flanch and the recessed edge welding of base.

Described the 3rd seal area comprises that the contact chip with the encapsulate base inserts pcb board, and by silica gel encapsulate base and pcb board is sealed.

The beneficial effects of the utility model:

A. product is really accomplished all-sealed structure, make that product inside is isolated from the outside, the product function part is not subjected to the influence of external environmental condition, has improved the ability of product adaptation varying environment greatly, for the use stability of having guaranteed product in the adverse circumstances such as high humidity/Gao Chen.

B. the product base partly adopts the encapsulate mode to combine with chip, rather than combines with base assembling riveted mode as traditional terminal, and one can arrive better sealing effectiveness, and two can effectively save before the man-hour of terminal assembling one by one.

Description of drawings

Fig. 1 is overall structure schematic diagram of the present utility model (comprising front view, left view, right view).

Fig. 2 is the cutaway view of Fig. 1.

Fig. 3 is the axle core schematic diagram of Fig. 2.

Fig. 4 is the assembling decomposing schematic representation of Fig. 3.

Fig. 5 is the assembly drawing of Fig. 4.

Fig. 6 is the shell schematic diagram of Fig. 2.

Fig. 7 is the assembling decomposing schematic representation of Fig. 6.

Fig. 8 is axle core and the shell assembly drawing of Fig. 2.

Fig. 9 is the encapsulate base schematic diagram of Fig. 2.

Figure 10 is the assembling decomposing schematic representation of Fig. 1.

Figure 11 is the utility model and the pcb board schematic diagram that is packaged together.

Among the figure: 1 steel ball, 2 springs, 3 cores, 31 spring grooves, 4 O-ring seals, 5 brushes, 6PCB plate, 7 stop tab, 8 shells, 81 steel bead grooves, 82 backstop draw-in grooves, 83 outer shell flanch, 9 encapsulate bases, the recessed edge of 91 bases, 10 contact chips, 11 layer of silica gel, 12 convex-concave edge glue positions.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in the figure, the utility model is different with traditional band switch, in order to reach hermetic purpose, has at structure and has done concrete encapsulation process, is mainly reflected in two aspects, specifies as follows:

A. the hermetic unit of rotating shaft core and shell: as Fig. 2, shown in Figure 10, behind the rotating shaft core 3 riveted brushes 5, (steel ball can be adorned two also can adorn one in spring groove 31 to refill steel ball 1 and spring 2, be used to distinguish torsion), put O-ring seal 4 then, group founds a core semi-finished product (as shown in Figure 3), in addition, stop tab 7 is built on the backstop draw-in groove 82 of shell 8 group and founds into shell+stop tab semi-finished product (as shown in Figure 6), and the built-in purpose of stop tab also is in order to seal.Axle core semi-finished product are inserted in shell+stop tab semi-finished product group found into shell and axle core component (as shown in Figure 8), there is O-ring seal 4 to seal between its axis moving axis core 3 and the shell 8, this cushion rubber neither can influence the rotation of a core because of flexible, has also reached the effect of sealing simultaneously;

B. the hermetic unit of shell and base: as Fig. 2, shown in Figure 10, shell has just become finished product (as shown in Figure 1) with 9 combinations of encapsulate base again with axle core component, but in order to reach hermetic effect, we can take finished product away again and do ultrasonic Treatment, (as A place among Fig. 2), we are provided with the recessed edge 91 of a circle ultrasonic wave base on encapsulate base 9, on shell 8, be provided with a circle ultrasonic wave outer shell flanch 83, when ultrasonic wave, convex-concave edge glue position 12 (circle) can fuse at one, shell 8 and encapsulate base 9 are tightly lumped together, thereby make the contact component brush 5 of product inside be sealed in inside fully with contact chip 10, the product function part just is unlikely the influence that is subjected to external environment.

C. as shown in figure 10, after encapsulate base 9 and pcb board 6 pass through encapsulating, between encapsulate base 9 and pcb board 6, formed layer of silica gel 11, only reveal a rotating shaft outside, and between rotating shaft and shell O-ring seal is arranged, product inside is isolated fully, at this moment has been the band switch of whole sealing status truly, and this kind sealing state can adapt to client's high humidity/adverse circumstances such as high dirt/waterproof fully.

Certainly, this product also can be cancelled O-ring seal or ultrasonic wave heating according to user rs environment and cost requirement, thereby accomplishes the semitight form.The shell of the all-sealed band switch of the utility model and encapsulate base are except that above-mentioned use ultrasonic sealing in addition, also can adopt and resinize and hot-setting adhesive implementation sealing, all any trickle modifications of above example being done according to the utility model structure, equivalent variations all belongs in the scope of the utility model technology.

Claims

1. all-sealed band switch, it is characterized in that comprising a core, shell, the encapsulate base, wherein said axle core lower end riveted has brush, axle core lower end also is provided with spring groove, in spring groove, be provided with spring and steel ball, be provided with annular steel bead groove and backstop draw-in groove in the described shell, be provided with contact chip in the described encapsulate base, its axis core retainer plate is contained on the shell, the steel ball of axle core lower end contacts with annular steel bead groove in the shell by spring, the encapsulate base is docked at the bottom of shell, contact chip slips in the brush of axle core lower end and the encapsulate base, wherein between shell and axle core, be provided with first seal area, between encapsulate base and shell, be provided with second seal area, between encapsulate base and pcb board, be provided with the 3rd seal area.

2. all-sealed band switch as claimed in claim 1, it is characterized in that described first seal area is included in shell and axle is provided with O-ring seal and stop tab between the core, wherein O-ring seal is sleeved on the core, the cylindrical of sealing cushion rubber contacts with stop tab, and this stop tab installs in the enclosure the backstop draw-in groove.

3. all-sealed band switch as claimed in claim 1, it is characterized in that described second seal area is located at the interface between outer casing bottom and the encapsulate base, wherein the interface at outer casing bottom is provided with outer shell flanch, interface at the encapsulate base is provided with the recessed edge of base, described outer shell flanch is plugged on the recessed edge of described base, is one through heating outer shell flanch and the recessed edge welding of base.

4. all-sealed band switch as claimed in claim 1 is characterized in that described the 3rd seal area comprises that the contact chip terminal with the encapsulate base inserts pcb board, and by fluid sealant encapsulate base and pcb board is sealed.