CN1200346A - Waterproof structure of cases - Google Patents

Abstract

When install a couple of box cooperately, the invention provides a method to avoid the formation of a gap at seal portions of casings and the occurrence of strain of the casings by providing a place where a volume of a spur crushed when the casings are fitted to each other is released, a groove 3 is provided at a seal portion of a casing 1 over its entire circumference, and silicone is applied to the groove 3 to form a spur part 4 adhering closely to the groove 3 and capable of being deformed elastically. The spur part 4 is formed of two kinds of the materials different in hardness. Silicone 7 having low hardness is applied to a bottom face of the groove, and silicone 8 having high hardness is then applied to the top portion of the silicone 7. Further, a protrusion 5 is provided at a seal portion of a casing 2 over its entire circumference.

Description

Waterproof structure of the box

The invention relates to a waterproof structure of a box body, in particular to a waterproof structure using two kinds of sealing materials for outdoor use.

It should be understood that among the boxes described in the specification, one box cooperates with the other box, which is generally referred to as a box.

Conventionally, it is shaped as a hand-held device and an outdoor device, for example, has a structure for the case to cooperate with each other through the packaging material to achieve the purpose of waterproofing. 1A-1C show an example of a conventional waterproof structure using a packing material box. This structure makes the box body 21 and the box body 22 cooperate with each other, and the purpose of waterproofing is achieved by inserting the packing material 24 into the groove 23 arranged on the sealing part of the box body 21 and the matching box body 22 . Packaging material 24 is made up of packaging material body 24A and packaging material flap 24B, and wherein, when packaging material 24 is inserted groove 23, because elastic deformation flap 24B presses the wall of groove 23 and packaging material body 24A is also received from The pressure on the side walls of the groove 23 prevents the packaging material 24 from coming off.

However, when the box body 22 is closed or opened, the packaging material 24 may still fall off, and if the packaging material is in an improperly inserted state, waterproofing will not be guaranteed. The above-mentioned waterproof structure is provided with the solution of pressing the packaging material 24 into the groove 23 to cooperate, however, said packaging material does not have to come out of the groove 23 forever.

To solve the above-mentioned problems, it is suggested that the waterproof structure as the box body be realized by adopting a sealing method in which a groove is arranged on the sealing part of the box body, and silicon, silicone rubber, silicone resin or the like is applied to the groove . 2A and 2B show an example of realizing the waterproof structure of the box by this sealing method. By directly applying silicon to the groove 33 configured on the sealing part of the box body 31 to form a seal 34, the waterproof structure makes the box body 31 and the box body 32 cooperate with each other to achieve the purpose of waterproofing, and then the box body 31 and the box body 32 mount each other. When the silicon is applied directly to the tank 31, the resultant stick prevents the silicon from falling off.

3A to 3C show a waterproof structure of a semiconductor device described in Unexamined Japanese Patent Laid-Open No. 17359 of 1992.

A heat sink 45 has a water tank for conducting cold air in the cover plate 43 through a metal base plate 44 to cool and dissipate the heat of the semiconductor. On the other hand, the frame-like wrapping material 41 is disposed around the periphery of the cover plate 43 through which the protrusion 42 presses the cover plate 43 due to elastic deformation and prevents water droplets 4 a on the radiator 45 from entering the cover plate 43 . The cover plate 43 is connected to the metal base 44 with an adhesive 46 . However, the waterproof structure is rarely applied to portable devices and outdoor devices due to problems related to durability and appearance.

As shown in FIGS. 2A and 2B, in the conventional sealing method, when the housings are mated with each other, a gap is formed in the sealing portion due to the rebound of silicon. Especially, when this sealing method is applied to a plastic box, deformation of the box may occur. The rationale: when the boxes fit together, there is no area to slow down the resulting volume of the squeezed silicon.

If silicon with low hardness (or any material with compressibility) is used to overcome the above disadvantages, since its compressibility solves the problem of springback, then its waterproof effect is reduced compared to silicon with higher hardness . The reason is that silicon with lower hardness is less compressible than silicon with higher hardness. Therefore, the former has a lower waterproof performance than the latter.

The object of the present invention is to avoid deformation of the casings by providing an area for relieving the resultant volume of the squeezed seal when a pair of casings are mated, avoiding the formation of a gap in the sealing portion of the casings.

According to the present invention, there is provided a waterproof structure of a case, wherein, on a sealing portion of a pair of cases which cooperate with each other, a sealing member is composed of a first material and a second material, the first material having a relatively low hardness and Compressibility, which is directly applied to the case, and the second material with higher hardness and elasticity, which is directly applied to the first material, wherein the seal is squeezed by another case to achieve the purpose of waterproofing.

The waterproof structure of the present invention obtains waterproof performance by tightening screws to install the box and extruding an elastically deformable seal on the sealing part. The seal consists of one material of lower hardness and compressibility (such as: silicon or the like) applied directly to the tank and another material of higher hardness and elasticity (such as: silicon, silicone rubber, silicone resin or similar material). When pressure is applied to the sealing portion, the less hard silicon or the like is compressed so that the resultant volume of the compressed sealing material is relaxed, which prevents gaps from forming between the tanks and deformation of the tanks.

Relatively hard silicon or the like formed on the surface of the sealing portion has elasticity enough to obtain a waterproof effect.

Figure 1A shows an exploded perspective view of a case using conventional packaging materials for waterproof construction;

Fig. 1B shows a cross-sectional view of the packing material part of the case, which uses conventional packing material for waterproof structure before mating with each other;

Fig. 1 C represents the sectional view of the conventional packing material that is used for casing waterproof structure;

Fig. 2 A represents the exploded perspective view of the conventional sealing method that is applied to casing waterproof;

Fig. 2B represents the sectional view along the B-B direction of Fig. 2A line;

3A shows a plan view of a conventional waterproof structure of a semiconductor device;

3B shows a cross-sectional view of a conventional waterproof structure of a semiconductor device;

3C shows an enlarged cross-sectional view of a conventional waterproof structure of a semiconductor device, for showing the state of water droplets formed on the surface of the heat sink;

Fig. 4A shows the exploded perspective view of the casing with the waterproof structure of the present invention;

Fig. 4B represents the cross-sectional view along Fig. 4A line A-A direction;

Figure 4C represents a sectional view of the sealed portion of the casing with a waterproof structure, for illustrating the state before mutual cooperation; and

Fig. 4D shows a cross-sectional view of the sealing part of the case with the waterproof structure embodiment, for illustrating the state after mutual cooperation.

Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings.

Referring to accompanying drawings 4A-4D, the box for outdoors includes: box body 1 and box body 2, both have a structure sealed by fastening screw 6. The case 1 has a sealing portion, around which an annular groove 3 is arranged, wherein silicon is applied in the groove 3 in order to receive it, thereby forming an elastically deformable seal 4 in contact with the groove 3 . The sealing member 4 is made of two kinds of materials, silicon with different hardness is used, silicon 7 with low hardness is used to the inner bottom surface of the groove 3, and silicon 8 with high hardness is used at the same time. In addition, a protrusion is arranged along the sealing portion surrounding the case 2 . Just like the box shape mentioned above, when the box body 1 and the box body 2 cooperate with each other, the screws are tightened, and the protrusion 5 presses the sealing member 4, so as to achieve the purpose of waterproofing. At this time, the silicon 7 with less hardness has compressibility to reduce the volume synthesized by the extruded silicon. Thereby, no gap is formed between the box body 1 and the box body 2, and thus deformation of the box body can be avoided.

In addition, due to its high elasticity, harder silicone is used for waterproofing.

From the foregoing, it can be seen that the present invention can avoid the formation of gaps at the sealing portion and the deformation of the boxes when the boxes are mated with each other. The box is provided with a waterproof structure obtained by sealing with an elastically deformable seal.

The reason is that the seal is made of a material of lower hardness and compressibility (such as: silicon or the like) applied directly to the tank and another material of higher hardness and elasticity applied directly to said material (e.g. silicon or similar material). When pressure is applied to the seal, the less hard silicon is compressed. Thus, the resultant volume of the extruded seal can be reduced.

In addition, the seal of the present invention is compressible and elastic for waterproofing.

The reason is that the seal is made of a material of lower hardness and compressibility (such as: silicon or the like) applied directly to the tank and another material of higher hardness and elasticity applied directly to said material (such as: silicon or the like material), due to the use of relatively high hardness silicon or the like has a high elasticity material, therefore, springback occurs when extruded.

Claims (4)

1. the waterproof construction of a casing, it is characterized in that: on the hermetic unit of one of a pair of casing that cooperatively interacts, sealing member by the described casing part that directly puts on described casing have than soft and compressible first material and directly put on described first material have higher hardness and elastomeric second material constitutes, and wherein said sealing member is partly pushed to reach water repellant purpose by another casing of described casing.

2. as the waterproof construction at the casing described in the claim 1, it is characterized in that: described first and second materials all are silicon.

3. as waterproof construction, it is characterized in that: be arranged on the described sealing member of a projections press on described another casing at the casing described in the claim 1.

4. as the waterproof construction at the casing described in the claim 1, it is characterized in that: cannelure is arranged on a casing part of described casing, and described sealing member is accommodated in the described groove.

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