JP2005244103A - Box-body airtight structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box-body airtight structure, in which the scattering of a part by an explosion is inhibited minimally by a simple structure and man-hours for a design are decreased, which is lightened, the space of which is diminished and the cost of which is reduced. <P>SOLUTION: In the box-body airtight structure, electronic equipment is housed to the hermetically sealed inside composed of a plurality of the box bodies. In the airtight structure, a plurality of the box bodies are aligned mutually, the first box body 10 and second box body 20 of the aligned box bodies are clamped to the second box body 20 via the first box body 10 by a bolt 30 with a head section 30a and fast stuck mutually. The clamping section 22a of the second box body 20 is formed of the quality of the material having a strength weaker than the quality of the material of the bolt 30 so that the clamping section 22a of the second box body 20 clamped by the bolt 30 is broken and a stuck state is released, when the internal pressures of the box bodies rise. The slip-off of the second box body 20 is prevented, by clamping a nut 40 on the end-section side of the bolt 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a case hermetic structure, and more particularly to a case hermetic structure in which an electronic device is accommodated in a sealed interior composed of a plurality of cases.

Conventionally, a case airtight structure is used for a case in which an electronic device is housed inside a power amplifier such as a base station installed outdoors, and this case has moisture inside due to rain or snow inside. It has been considered important that airtightness that does not enter electric equipment and the danger of explosion due to generation of hydrogen gas (hereinafter referred to as gas) due to electrolysis of the infiltrated moisture even if moisture invades.
Here, as one embodiment of a conventional case hermetic structure, even if a plurality of gas vent holes are formed in the peripheral wall of a sealed case that houses an electronic device and moisture enters and gas is generated, A structure that avoids the danger of explosion by discharging gas from a hole for degassing is well known (see, for example, Patent Document 1).
JP-A-8-307070

  However, in one embodiment of such a conventional case confidential structure, a gas vent hole is provided and a plurality of holes such as a vent hole and a communication hole are simultaneously drilled to prevent moisture from entering through the hole. However, the intrusion of moisture cannot be suppressed, and a new problem of deterioration of the electronic device housed therein occurs.

  Therefore, the conventional case airtight structure has a sealed airtight structure that reliably suppresses the ingress of moisture and moisture, and has a sealed structure that can withstand even when the internal pressure such as an explosion suddenly rises. It was often used. FIG. 7 is a block diagram showing an embodiment of such a conventional hermetically sealed casing airtight structure. FIG. 8 is a cross-sectional view showing a cross section taken along line EE shown in FIG.

  An example of the former sealed type will be described with reference to FIGS. As shown in FIG. 7, in one embodiment of a conventional hermetically sealed casing airtight structure, an electronic device (not shown) is housed inside a pair of casings that are aligned and sealed. The first housing 70 and the second housing 80 which are a pair of matched housings are provided, and the bolt 90 having the head 90a and the nut 100 are fastened to each other to prevent moisture from entering. Yes. Here, the first casing 70 and the second casing 80 are provided as a pair of concave box bodies that are open on one side, and a space (not shown) that accommodates the electronic device inside is aligned with each other. Provided. Moreover, the 1st housing | casing 70 and the 2nd housing | casing 80 have the collar parts 72 and 82 extended outside from the peripheral edge which mutually aligns, as shown in FIG. By penetrating through holes 72a and 82a, respectively, through which bolts 90 are inserted and the nut 100 is fastened from the end side, the two are tightly fixed to each other to prevent moisture from entering. Further, the first housing 70 and the second housing 80 are designed so that moisture does not enter inside and a gas is generated due to the combination of hydrogen and oxygen so that it does not explode and explode even if it explodes. The wall thickness F shown in (1) is secured sufficiently thick.

  As described above, in the conventional case hermetic structure, the pair of cases including the first case 70 and the second case 80 are firmly fixed to each other by fastening the bolts 90 and the nuts 100 so as to ensure moisture intrusion. The first casing 70 and the second casing 80 are provided with a large thickness F so that they can sufficiently withstand even if an explosion occurs due to moisture intruding into the interior, and ribs (not shown) are frequently used. By doing so, the strength was increased to prevent the casing from scattering during the explosion. Also, the bolt 90 and the nut 100 are considerably larger than usual so that the casing is not scattered due to the breakage of the bolt 90 in particular.

However, in the conventional casing airtight structure, the thickness F of the first casing 70 and the second casing 100 is increased to increase the strength against explosion, thereby preventing the casing from bursting and scattering. In addition, it is necessary to design a high-strength case that specifically considers the entire case against this explosion, and it takes a design man-hour, and this high-strength case increases the thickness F and increases the weight of the whole case. There was a problem that it was difficult to reduce the weight.
Further, in the conventional case hermetic structure, a large number of bolts 90 and nuts 100 that are larger than usual are used in order to prevent the fixed and fixed alignment between the first case 70 and the second case 80 from being separated due to explosion. Accordingly, there is a problem in that the weight is increased and the cost is increased, and the arrangement space is taken to make it difficult to reduce the space.

  The present invention solves such a problem, and provides a low-cost casing hermetic structure that has a simple structure, minimizes the scattering of parts due to explosion, reduces the number of design steps, and is reduced in weight and space. With the goal.

In order to solve the above-described problem, the present invention is a case-hermetic structure in which an electronic device is housed in a sealed interior composed of a plurality of cases, and the plurality of cases are aligned with each other, and the matching cases A bolt having a head with the first housing and the second housing is fastened to the second housing via the first housing and brought into close contact with each other, and the bolt increases when the internal pressure of the housing increases. The fastening part of the second housing is made of a material whose strength is weaker than the material of the bolt so that the fastening part of the second housing to which the bolt is fastened is broken and the contact state is released. A nut is fastened to prevent the second housing from coming off.
Here, it is preferable to attach a shock absorbing material to the bolt between the fastening portion of the second housing and the nut. Moreover, it is preferable that a volt | bolt consists of a stainless material and the fastening part of a 2nd housing | casing consists of an aluminum material. The buffer material is preferably rubber.

As described above in detail, according to the case hermetic structure according to the present invention, the fastening portion is broken at the time of explosion and the case is degassed by releasing the contact state between the first case and the second case. In order to prevent scattering of the housing, it is possible to easily prevent the housing from scattering by designing only the fastening portion without considering the strength of the entire housing, reducing the design man-hours, and without increasing the thickness of the housing. The weight of the entire body can be reduced.
In addition, according to the case hermetic structure according to the present invention, as described above, the fastening portion that fastens with the bolt that tightly fixes the first case and the second case is damaged to prevent scattering of the case. The number of bolts for tightly fixing the first housing and the second housing can be reduced, and the size can be reduced. Accordingly, the weight can be reduced, the arrangement space can be reduced, and the overall cost can be reduced. Can be reduced.

  Next, an embodiment of a case airtight structure according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing a first embodiment of a casing airtight structure according to the present invention. 2 is a cross-sectional view showing a cross section taken along the line AA shown in FIG. 3 is an operation explanatory view showing an operation at the time of the explosion in the cross section shown in FIG. 2. FIG. 3 (a) shows a state before the explosion, and FIG. 3 (b) shows a state after the explosion. ing. FIG. 4 is a configuration diagram showing a second embodiment of the casing hermetic structure according to the present invention. 5 is a cross-sectional view showing a cross section taken along the line CC shown in FIG. 6 is an operation explanatory view showing the operation at the time of the explosion in the cross section shown in FIG. 5. FIG. 6 (a) shows the state before the explosion, FIG. 6 (b) shows the state at the time of the explosion, 6 (c) shows the state after the explosion.

  As shown in FIG. 1, the first embodiment of the case airtight structure according to the present invention is similar to the prior art shown in FIG. (Not shown) and a first housing 10 and a second housing 20 as a pair of matched housings. The first casing 10 and the second casing 20 are provided as a pair of concave box bodies that are open on one side, and are closed to each other so as to align with each other and store an electronic device (not shown) inside. Provided. Moreover, the 1st housing | casing 10 and the 2nd housing | casing 20 respectively form the collar parts 12 and 22 extended outside from the periphery of the opening surface which mutually aligns, as shown in FIG.

  Here, as shown in FIG. 2, the through-holes 12 a through which the bolts 30 can be inserted are drilled in the flanges 12, 22 as shown in FIG. 2. In addition, unlike the prior art shown in FIG. 7, the other second housing 20 side (the flange portion 22) is screwed and fastened to the bolt 30 inserted from the through hole 12 a on the first housing 10 side. Fastening portion 22a is formed. That is, in the first embodiment, in order to tightly fix the first casing 10 and the second casing 20 aligned with each other, the bolt 30 having the head 30a is attached to the through hole 12a of the first casing 10. The second housing 20 is screwed toward the head portion 30a of the bolt 30 to press and fix the first housing 10 in close contact with each other by being fastened to the fastening portion 22a of the second housing 20. It is formed in a sealed type.

  Further, when the internal pressure of the second casing 20 is suddenly increased due to an explosion of gas generated in the sealed casing due to an explosion or the like, the fastening portion 22a to which the bolt 30 is fastened is damaged by the internal pressure. The fastening portion 22a is formed of a material whose strength is weaker than that of the bolt 30 so that the tight contact state can be released and gas can be released. At this time, it is most desirable that the bolt 30 is preferably formed of a stainless steel material, and the fastening portion 22a of the other second housing 20 is formed of an aluminum material. Therefore, in the present embodiment, it is not necessary to design the casings with high thickness by providing the first casing 10 and the second casing 20 with a large thickness as in the prior art, and the thickness shown in FIG. It is possible to reduce the weight by forming it as thin as B. The material of the bolt 30 and the fastening part 22a is not limited to the above material, and the material of the fastening part 22a is weaker than the material of the bolt 30 and the fastening part 22a is destroyed at the time of explosion. That's fine. For example, the bolt 30 may be a metal and the fastening portion 22a may be a resin material.

  And when the internal pressure in the housing rises and the fastening portion 22a fastened to the bolt 30 is damaged, the second housing 20 is placed on the end portion side of the bolt 30 so that it does not come off from the end portion side of the bolt 30. The nut 40 is fastened to prevent it from coming off. As shown in FIGS. 1 and 2, the nut 40 is sealed so that the bolt 30 is fastened from one end and the other end is not penetrated, and the screwing is stopped at the end of the bolt 30. Thus, the second housing 20 is fixed in a state of being spaced apart without coming into contact with the flange portion 22. That is, when the nut 40 breaks the fastening portion 22a of the second casing 20 shown in FIG. 2 and degass the nut 40, the second casing 20 can be separated from the first casing 10 to release the contact state. The second casing 20 is fixed at a position away from the flange 22.

  When the first embodiment of the case hermetic structure according to the present invention formed as described above is used, first, moisture enters the inside sealed by the first case 10 and the second case 20 to bond hydrogen and oxygen. When a sudden increase in internal pressure such as an explosion occurs due to gas generated by this, as shown in FIG. 3 (a), the sudden increase in internal pressure causes the first casing 10 and the second casing 20 to move up and down. Force to pull away in the direction. Here, since the pressure when the casing is ruptured and scattered by this pulling force is not constant and is very large, the strength (thickness) that the casing does not rupture as in the prior art shown in FIG. 8 is assumed in advance. Compared to this, it is easy and simple to damage the fastening portion 22a before the casing is scattered as in the present embodiment. In addition, the fastening portion 22a is a press-fit structure. The material can be selected relatively freely if it is set so that it can be easily removed.

Therefore, in the first embodiment, the fastening portion 22a formed on the flange portion 22 of the second housing 20 is damaged before the first housing 10 and the second housing 20 are ruptured and scattered by the internal pressure. Since it is formed according to the material and the strength of the casing, it can be broken and degassed when a certain force is applied as shown in FIG. Moreover, in 1st Embodiment, as shown in FIG.3 (b), the nut 40 is fastened to the edge part of the volt | bolt 30 when the fastening part 22a is damaged and the housing | casing which contact | adhered mutually separated. Therefore, it is possible to prevent the second housing 20 from coming off from the end of the bolt 30 and scattering.
After that, when the fastening portion 22a is damaged due to such an explosion and the gas is vented, an administrator detects that an electronic device (not shown) in the housing is destroyed due to transmission / reception information or the like and is in an abnormal state. By doing so, it is exchanged for a new housing and electronic device.

As described above, according to the first embodiment of the case hermetic structure according to the present invention, the fastening portion 22a is broken at the time of explosion, and the gas is released by releasing the contact state between the first case 10 and the second case 20. In order to prevent scattering of the housing, the design of only the fastening portion 22a can easily prevent scattering of the housing without considering the strength of the entire housing, and the design man-hour can be reduced. The weight of the entire housing can be reduced without the need to increase (see FIG. 2).
Further, according to the first embodiment of the case hermetic structure according to the present invention, as described above, the fastening portion 22a fastened to the bolt 30 that tightly fixes the first case 10 and the second case 20 is damaged and the case is damaged. In order to prevent the body from scattering, the number of bolts 30 for tightly fixing the first housing 10 and the second housing 20 can be reduced, and the size can be reduced. A small space can be realized and the overall cost can be reduced.

  Next, a second embodiment of the case hermetic structure according to the present invention will be described in detail with reference to FIGS. Here, in 2nd Embodiment, all the components other than the shock absorbing material 50 shown in FIG. 4 are the same components as 1st Embodiment shown in FIG. 1, and the same code | symbol is attached to the same component. And redundant description will be omitted.

  As shown in FIG. 4, the second embodiment of the case airtight structure according to the present invention includes a first case 10 and a second case 20 that are a pair of cases, as in the first embodiment. Each of the first housing 10 and the second housing 20 is formed in a concave box having an opening on one side, and has a space (not shown) for accommodating an electronic device inside by aligning the openings with each other. Yes. Moreover, as shown in FIG. 5, the 1st housing | casing 10 and the 2nd housing | casing 20 each form the collar parts 12 and 22 extended outside from the periphery which mutually aligns. Here, as shown in FIG. 5, the through holes 12 a through which the bolts 30 can be inserted are formed in the flange portions 12 and 22 on the side of the aligned first casing 10, and the other first The fastening part 22a to be screwed and fastened to the bolt 30 is formed on the two housing 20 side.

  Here, unlike the first embodiment shown in FIG. 1, the second embodiment has elasticity between the nut 40 fastened to the end of the bolt 30 and the fastening portion 22 a of the second housing 20. Thus, a cushioning material 50 is provided so as to penetrate through the bolt 30. At this time, the nut 40 is configured to stop screwing at the end of the bolt 30 shown in FIG. 2, or screwed so that the bolt 30 penetrates as shown in FIG. It is formed in one of the structures to be pressed. Here, in the case of the nut 40 that abuts against the shock absorbing material 50 shown in FIG. 5 and performs finger pressure, a washer 60 is interposed between the nut 40 and the shock absorbing material 50, and the shock absorbing material 50 cannot be cut by friction when the nut 40 is fastened. I am doing so. Further, the cushioning material 50 uses an elastic body having a cushioning effect such as rubber, spring, hydraulic pressure, friction, and the like, and the structure is selected according to conditions such as cost, attenuation, and dimensions. That is, in the second embodiment, by attaching the cushioning material 50 to the bolt 30 that aligns and closely fixes the casing, the fastening portion 22a is damaged by the internal pressure and the first casing 10 and the second casing 20 are damaged. It effectively absorbs the repulsive force when pulling apart and prevents the casing or the casing from scattering due to rupture without increasing the strength of the nut or the casing itself. In the second embodiment, the wall thickness D shown in FIG. 5 can be made thinner and lighter, as with the wall thickness B of the first embodiment shown in FIG.

  When the second embodiment of the casing hermetic structure according to the present invention formed as described above is used, if a pressure increase due to an explosion or the like occurs inside the casing, as shown in FIG. A force that separates the first casing 10 and the second casing 20 in the vertical direction is applied to the first casing 10 and the second casing 20 by the internal pressure. And in 2nd Embodiment, as shown in FIG.6 (b), before the 1st housing | casing 10 and the 2nd housing | casing 20 burst and scatter by this internal pressure to separate, the fastening part of the 2nd housing | casing 20 is used. 22a is damaged and degassing is executed. As in the first embodiment shown in FIG. 1, the fastening portion 22a is formed of a material suitable for the material of the bolt 30 and the strength of the housing so that the housing itself is broken before it bursts and scatters. For example, when the bolt 30 is formed of a stainless steel material, the bolt 30 is formed of a material such as an aluminum material having a lower strength.

  In the second embodiment, as shown in FIG. 6B, the fastening portion 22a is broken and the first housing 10 and the second housing 20 are separated by the internal pressure to release the internal pressure to the outside. Although a gas venting structure is provided, settings such as the degree of separation and how much pressure is used to open the housing can be freely determined by the design of the cushioning material 50. For this reason, it is only necessary to adjust the amount of attenuation of the cushioning material 50 according to the shape and strength of the entire housing, so there is no need to give the second housing a special structure or strength as in the prior art shown in FIG. The housing cost and weight can be reduced.

  In the first embodiment, as shown in FIG. 6B, when the casings 22a are damaged and come into close contact with each other, the shock absorbing material 50 surely absorbs the reaction of the separation. In addition, since the second housing 20 does not come off from the bolts 30 and does not apply a load to the nut 40, the housing is reliably prevented from bursting and scattering by the buffer material 50. . And after absorbing the reaction which a housing | casing separates mutually and preventing scattering, the shock absorbing material 50, as shown in FIG.6 (c), again as the 1st housing | casing 10 and the 2nd housing | casing 20 Is returned to the original aligned state, and the release of the internal high pressure is completed. After that, the administrator senses that an electronic device (not shown) in the housing is destroyed and in an abnormal state based on transmission / reception information or the like, and replaces it with a new housing and electronic device.

  As described above, according to the second embodiment of the case hermetic structure according to the present invention, an impact is applied by the fastening portion 22a and the cushioning material 50 before the case ruptures and scatters due to pressure caused by an explosion or the like generated inside the case. In order to absorb, the same effect as in the first embodiment can be obtained, and by using the buffer material 50, the shock can be effectively absorbed, and the strength design for absorbing this shock can be facilitated and designed. There is a big effect in shortening the period.

As mentioned above, although embodiment of the housing | casing airtight structure by this invention was described in detail, this invention is not limited to embodiment mentioned above, It can change in the range which does not deviate from the summary.
For example, although the embodiment in which the bolt is formed of stainless steel (or metal) and the fastening portion is formed of aluminum (or resin material) has been described in detail, the present invention is not limited to this example. It is also possible to appropriately change the bolt and the fastening portion to other materials or combinations in accordance with the internal pressure change in the housing in which the internal pressure rapidly increases.

The block diagram (Example 1) which showed 1st Embodiment of the housing | casing airtight structure by this invention. Sectional drawing which shows the cross section of AA shown in FIG. Operation | movement explanatory drawing which shows the operation | movement at the time of the explosion in the cross section shown in FIG. The block diagram which showed 2nd Embodiment of the housing | casing airtight structure by this invention (Example 2). Sectional drawing which shows the cross section of CC shown in FIG. Operation | movement explanatory drawing which shows the operation | movement at the time of the explosion in the cross section shown in FIG. The block diagram which shows one Embodiment of the housing | casing airtight structure by the conventional sealing type. Sectional drawing which shows the cross section of the EE line shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st housing | casing 12 collar part 12a through-hole 20 2nd housing | casing 22 collar part 22a fastening part 30 bolt 30a head part 40 nut

Claims (4)

In a case airtight structure that houses electronic devices in a sealed interior consisting of a plurality of cases,
The plurality of casings are aligned with each other, and bolts having heads of the first casing and the second casing of the matching casings are fastened to the second casing via the first casing. When the internal pressure of the housing increases, the fastening portion of the second housing is released so that the fastening portion of the second housing to which the bolt is fastened is broken to release the contact state. Is formed of a material whose strength is weaker than that of the bolt, and a nut is fastened to an end side of the bolt to prevent the second housing from coming off. In the case airtight structure according to claim 1,
A housing airtight structure, wherein a cushioning material is passed through and attached to the bolt between the fastening portion of the second housing and the nut. In the case airtight structure according to claim 1 or 2,
The casing is airtight, wherein the bolt is made of stainless steel, and the fastening portion of the second casing is made of aluminum. In the case airtight structure according to claim 2,
The housing airtight structure, wherein the cushioning material is rubber.

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