JPH11233963A - Sealing structure for electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and surely seal a bottom plate by providing projections for accelerating shunt at the intersections of guide grooves, which connect a sealing compound storing recessed section at the center of the bottom plate to the peripheral edge, etc., of the bottom plate and the peripheral edge of the bottom plate. SOLUTION: An enclosure 1 of an electromagnetic relay is constituted with a bottom plate 3 inserted into a case 2 and guide grooves 6a-6u which connect a sealing compound storing recessed section 4 at the central part of the bottom plate 3 to the peripheral edge groove 7 of the bottom plate 3, and the peripheries of terminals 5a-5i are provided between the section 4 and groove 7 and terminals 5a-5i. By utilizing guide grooves 6a-6u, a liquid sealing compound is fed to the groove 7 and peripheries of the terminals 5a-5i. Of the intersections of the guide grooves 6a-6u and peripheral edge groove 7, the intersections of the guide grooves 6a, 6d, 6q, etc., and the peripheral edge groove 7 are selected, excepting the intersections at the four corners A1-A4 of the bottom plate 3 and projections 8a-8d are respectively provided to the intersections 9a-9d. Therefore, the airspace at the peripheral edge, etc., of the bottom plate can be sealed quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for electric equipment in which a gap formed in a case formed by fitting a bottom plate (base) is filled with a sealant, and more particularly to a capillary tube. The present invention relates to a sealing technique that uses a phenomenon to fill a gap around a bottom plate of an electric device such as an electromagnetic relay with a sealing agent quickly and without defects.

[0002]

2. Description of the Related Art A conventional electromagnetic relay to which a sealing structure for an electric device of this kind is applied generally uses a case formed by fitting a bottom plate to accommodate a relay. A terminal protruding hole is formed in the bottom plate to be connected to draw out a terminal connected to the relay to the outside of the case.

[0003] For this reason, a minute gap is inevitably formed around the periphery of the bottom plate and around the terminals of the bottom plate even if strict size control is performed.

FIG. 7 shows an example of a conventional technique for sealing these gaps. As shown in FIG.
Reference numeral 01 is formed by fitting a bottom plate 103 to a case 102. In this configuration, a guide groove 10 is provided between the sealant storage recess 104 substantially at the center of the bottom plate 103, the peripheral edge of the bottom plate 103, and the terminal projecting hole 105 of the bottom plate 103.
6, the guide groove 106 is used to fill the gap between the sealant storage recess 104 and the periphery of the bottom plate 103 and the gap around the terminal 107 of the bottom plate 103 with the liquid sealant. .

In this conventional method, the liquid sealing agent is supplied to the sealing agent storage recess 104 substantially at the center of the bottom plate 103, and at the same time, the guide groove 106 into which the liquid sealing agent flows is shown in FIG. As shown in the figure, the liquid sealant has a concave shape in which both ends are raised at a right angle from the flat bottom surface, so that the speed of the liquid sealant is increased at both end portions (two places), which are the corner portions of the bottom surface of the guide groove 106, by capillary action. Therefore, in the guide groove 106, the entire liquid sealing agent flows in a state where the liquid sealing agent is pulled by the flow at both ends thereof due to the viscosity of the liquid sealing agent.

On the other hand, the housing 101 is a fitting structure of the case 102 and the bottom plate 103, and generally, as shown in FIG.
A gap X is formed between the end (peripheral edge) of the (bottom plate 103) and the case 102 and extends in a direction substantially orthogonal to the guide groove 106. Therefore, as shown in FIGS. 10A to 10E, a substantially T-shaped flow path is formed by the guide groove 106 and the gap X.

In this case, as shown in FIGS. 10 (a) to 10 (e), the leading portion of the flow of the liquid sealant Y is sequentially shifted, and the leading end of the flow of the liquid sealant Y is located at the end of the guide groove 106. Then, the flow changes direction and spreads along the gap X. However, the flow of the liquid sealant Y is stagnated in the flow state in which it abuts and spreads, so that the flow speed of the liquid sealant is suppressed for each guide groove 106 in which the stagnation occurs.

[0008]

As described above, in the prior art, the flow of the liquid sealant Y is stagnated at the periphery of the bottom plate, and the flow speed of the liquid sealant Y is reduced for each guide groove where the stagnation occurs. For this reason, the liquid sealant Y does not evenly reach the gap at the periphery of the bottom plate 103 in FIG. 7 within a predetermined time determined by the curing characteristics of the sealant, or the liquid sealant Y There is a risk of being cured in the middle.

Therefore, according to the conventional sealing structure for electric equipment, there often occurs a problem that the gap at the peripheral edge of the bottom plate 103 cannot be sealed as desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a seal structure for electric equipment which can quickly and reliably seal a gap at a peripheral edge of a bottom plate. It is in.

[0011]

According to the first aspect of the present invention, a guide groove is provided for connecting a sealant storage recess substantially at the center of the bottom plate to the peripheral edge of the bottom plate, and the guide groove is used. ,
In the seal structure of an electric device that is filled with a liquid sealant from the sealant storage recess to a gap or the like on the peripheral edge of the bottom plate, at an intersection point between the guide groove and the peripheral edge of the bottom plate,
The present invention provides a seal structure for electric equipment, wherein a protrusion for diverting flow is provided.

According to the invention described in claim 1 of the present application, the liquid sealant is guided by the diversion-promoting protrusions at the intersection of the guide groove and the peripheral edge of the bottom plate, and is guided in two directions along the peripheral edge of the bottom plate. To be diverted quickly to
Moved in the direction.

For this reason, the liquid sealant can be spread evenly over all the gaps of the bottom plate per unit of the guide groove within a predetermined time determined by the curing characteristics of the sealant, and the bottom plate peripheral portion Good airtightness.

According to a second aspect of the present invention, in the electric apparatus according to the first aspect, the flow promoting projection is provided on an inner surface of the case forming a fitting portion with the peripheral edge of the bottom plate. Seal structure.

According to the invention as set forth in claim 2 of the present application, when the case is manufactured, the diversion promoting projection can be provided on the inner surface of the case so that the axis of the guide groove coincides with the guide groove. The seal structure according to the present invention could be constructed without providing the projection in a separate step at the intersection of the groove and the peripheral edge of the bottom plate.

In the invention according to claim 3 of the present application, the guide groove extending to the intersection point provided with the flow-promoting protrusion is extended to a position surrounding the tip portion of the flow-promoting protrusion. The seal structure of an electric device according to any one of claims 1 to 2, characterized in that:

According to the third aspect of the present invention, since the leading end of the projection is surrounded by the extending portion of the guide groove, the projection is guided by the diversion promoting projection and follows the peripheral edge of the bottom plate. When the liquid sealant is split in two directions, the splitting action occurs around the tip of the splitting promoting protrusion. In this state, the use efficiency of the flow-promoting protrusions is increased for each unit of the guide groove that continues to the intersection point where the flow-promoting protrusions are provided, so that the spreading speed of the liquid sealant is further increased. Therefore, the required lead time for uniformly spreading the liquid sealant to all the gaps on the periphery of the bottom plate will be reduced.

In the invention described in claim 4 of the present application, the intersection point at which the diversion-promoting projection is provided is an intersection point of the bottom plate corner where the intersection between the guide groove and the bottom plate periphery is a corner. The seal structure of an electric device according to any one of claims 1 to 3, wherein the seal structure is configured at a position selected in accordance with the curing characteristics of the sealant.

According to the invention as set forth in claim 4 of the present application, at the intersection of the corners, even if there is no diversion-promoting projection provided to increase the spreading speed of the liquid sealant, the liquid sealant can be used. Because the spreading speed of the
Except for the position of the intersection of the corners of the bottom plate, the position of the intersection provided with the diversion-promoting protrusion may be configured at a position selected according to the curing characteristics of the sealant. In the case of this configuration, within a predetermined time determined by the curing characteristics of the sealant, the intersection position of the intersection position where the diversion promoting projections necessary for uniformly spreading the liquid sealant to the gap over the entire area of the bottom plate peripheral edge are provided. When configuring the seal structure according to the present invention, the number can be minimized,
This would be advantageous from the viewpoint of reducing man-hours and manufacturing costs.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a seal structure of an electromagnetic relay to which the present invention is applied will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a bottom plate surface side of an electromagnetic relay having an application structure of the present invention in a state before sealing. In the figure, 1 is a housing of an electromagnetic relay, 2 is a case, 3 is a bottom plate, 4 is a sealant storage recess, 5a to 5i are terminals, 6a to 6u are guide grooves, 7 is a bottom plate peripheral groove, 8a to 8
d is a protrusion for promoting flow splitting, and 9a to 9d are intersection points of the present invention.

As shown in FIG. 1, the housing 1 of the electromagnetic relay is constructed by fitting a bottom plate 3 to a case 2. In this configuration, guide grooves 6a to 6u are provided between the sealant storage recess 4 substantially at the center of the bottom plate 3 and the bottom plate peripheral groove 7 and around the terminals 5a to 5i.
The seal structure of the electromagnetic relay is configured such that a liquid sealant is filled from the sealant reservoir concave portion 4 to the bottom plate peripheral groove 7 and the periphery of the terminals 5a to 5i by utilizing u. In this regard, it is substantially the same as the conventional one.

In this embodiment, in addition to the above basic configuration,
Of the intersections between the guide groove and the bottom plate peripheral groove 7, the intersections of the bottom plate corners A1, A2, A3, and A4 are excluded, and the guide groove 6a and the bottom plate peripheral groove 7 are formed according to the curing characteristics of the sealant. Intersection position 9a, Intersection position 9b between guide groove 6d and bottom plate peripheral groove 7, Intersection position 9 between guide groove 6q and bottom plate peripheral groove 7
c, an intersection point 9d between the guide groove 6j and the bottom plate peripheral groove 7 is selected, and each of the selected intersection points 9a, 9b, 9c, 9 is selected.
In the case of d, the projections 8a, 8b, 8c, and 8d are provided.

That is, in the present embodiment, FIG.
As shown in the detailed explanatory views of (a) and (b), at each of the selected intersection points 9a to 9d, a guide groove 6 is formed on the inner surface of the case 2 forming a fitting portion with the peripheral edge of the bottom plate 3.
a, 6d, 6q, 6j
Protrusions 8a to 8d formed narrower than the guide grooves 6a, 6d, 6q, 6j are provided. In addition, each intersection point 9a
Guide grooves 6a, 6d, 6q, and 6j that continue to
The projections 8a, 8b, 8c, and 8d extend to a position surrounding the distal ends thereof. 1A is a top view of a main part when the bottom plate is arranged upward, and FIG. 1B is a sectional side view of the main part.

For this reason, each of the selected intersection points 9a
3 to 9d, as shown in FIG.
When the liquid sealing agent is discharged from the bottom plate 3 and the liquid sealing agent is supplied to the sealing agent storage recess 4 substantially at the center of the bottom plate 3, and at the same time, the liquid sealing agent flows into the guide grooves 6a, 6d, 6q, and 6j, FIG. As shown in (e) to (e), the leading part of the flow of the liquid sealant Y is sequentially shifted, and the guide grooves 6a, 6
It is sent from the end of d, 6q, 6j. The head of the flow of the liquid sealant Y that has been sent abuts against the inner surface of the case 2, and then changes direction and becomes a flow that spreads along the bottom plate peripheral groove 7. At this point, the liquid sealant is filled around the terminals 5a to 5i.

More specifically, when the head of the flow of the liquid sealant Y moves to each of the intersection points 9a to 9d, at each of the intersection points 9a to 9d, as shown in FIG. When the head of the flow of the agent Y abuts against the case 2, it is guided by each of the projections 8 a to 8 d and quickly diverted in two directions on the bottom plate peripheral groove 7 along the periphery of the bottom plate 3. The movement is made in the two directions.

In particular, since the distal ends of the projections 8a to 8d are surrounded by the extended portions 6A of the guide grooves 6a, 6d, 6q, 6j, the projections 8a to 8d guide the guides 8a to 8d in two directions along the periphery of the bottom plate. When the liquid sealant is divided, the projections 8a to 8a
Around the tip of 8d, the shunt action occurs. In this state, the intersection points 9a to 9d where the projections 8a to 8d are provided
The use efficiency of the projections increases for each of the units of the guide grooves 6a, 6d, 6q, 6j which continue to reach, so that the spreading speed of the liquid sealant Y increases. Therefore, the required lead time for spreading the liquid sealant Y evenly over all the gaps at the periphery of the bottom plate is reduced.

On the other hand, at the respective intersections of the bottom plate corners A1, A2, A3, and A4, even if there is no diversion-promoting projection provided to increase the spreading speed of the liquid sealant as described above, the liquid sealant can be used. Spreading speed increases. For this reason, the bottom plate 3 selected according to the curing characteristics of the sealant, excluding the intersections of the bottom plate corners A1, A2, A3, and A4.
Each intersection position 9a to 9 provided with a protrusion at a substantially central position of each side.
d is configured.

In the case of this configuration, a diversion-promoting projection, which is necessary to spread the liquid sealing agent evenly in the gap over the entire periphery of the bottom plate within a predetermined time determined by the curing characteristics of the sealing agent, is provided. The number of intersection points can be minimized, which is advantageous from the viewpoint of reducing man-hours and manufacturing costs when configuring the seal structure according to the present invention. In addition, at the time of manufacturing the case, a flow-promoting protrusion can be provided on the inner surface of the case so that the axis of the guide groove is aligned with the guide groove.
There is also an advantage that the seal structure according to the present invention can be configured without providing a projection in a separate step at the intersection of the guide groove and the peripheral edge of the bottom plate.

As described above, when the liquid sealant uniformly spreads around the terminals 5a to 5i and the bottom plate peripheral groove 7, the liquid sealant Y is filled as shown in FIG. The liquid sealant Y is cured, and a seal structure of the electromagnetic relay with high seal reliability is obtained.

In addition to the configuration on the bottom plate surface side shown in FIG. 1, for example, the technique disclosed in Japanese Utility Model Laid-Open Publication No. 61-36938, that is, as shown in FIG. When a technique of forming, for example, a V-shaped narrow groove 6B extending along the groove 6 on the bottom surface is applied, an effect of increasing a corner portion with respect to the guide groove 6 and promoting a capillary phenomenon can be exerted. Therefore, it is possible to further reduce the required lead time for uniformly spreading the liquid sealant Y to all the gaps around the peripheral edge of the bottom plate.

Further, according to the present invention, for an electric device other than an electromagnetic relay, a diverting flow promoting device is formed at the intersection of the guide groove and the peripheral edge of the bottom plate such that the axis is aligned with the guide groove as in the above embodiment. The projection may be a seal structure provided. The operation and effects of these embodiments are almost the same as those of the above-described embodiments, and thus description thereof will be omitted.

[0032]

As is apparent from the above description, according to the present invention, it is possible to provide a seal structure for electric equipment which can quickly and reliably seal a gap such as a peripheral edge of a bottom plate.

[Brief description of the drawings]

FIG. 1 is a plan view showing a bottom plate surface side of an electromagnetic relay having an application structure of the present invention in a state before sealing.

FIG. 2 is a detailed explanatory view of an intersection position forming a main part of the application structure of the present invention.

FIG. 3 is a perspective view showing a state in which a liquid sealant is supplied to a sealant storage recess substantially at the center of a bottom plate.

FIG. 4 is a diagram illustrating a process of transition of a flow of a liquid sealant in the embodiment of the present invention.

FIG. 5 is a perspective view showing a completed state of the seal of the electromagnetic relay according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an embodiment of a guide groove provided with a V-shaped narrow groove on the bottom surface.

FIG. 7 is a perspective view showing a configuration of a conventional electromagnetic relay seal structure.

FIG. 8 is a cross-sectional view showing a conventional guide groove.

FIG. 9 is a cross-sectional view illustrating a structure of a peripheral edge of a conventional bottom plate.

FIG. 10 is a view showing a process in which the flow of a conventional liquid sealant is changed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case of electromagnetic relay 2 Case 3 Bottom plate 4 Sealant storage recess 5a-5i Terminal 6a-6u Guide groove 6A Extension part of guide groove 7 Bottom plate peripheral groove 8a-8d Projection for diverting promotion 9a-9d The present invention is applied. Intersection position 10 Nozzle Y Liquid sealant

Claims (4)

[Claims] A guide groove is provided for connecting a seal agent storage recess at a substantially central portion of a bottom plate to a peripheral edge of the bottom plate, and a liquid sealant is formed from the seal agent storage recess to a gap such as the peripheral edge of the bottom plate using the guide groove. A seal structure for an electric device, characterized in that, in a seal structure of an electric device, a flow-promoting protrusion is provided at an intersection of the guide groove and the peripheral edge of the bottom plate. 2. The seal structure for an electric device according to claim 1, wherein the branching promoting projection is provided on an inner surface of the case forming a fitting portion with the peripheral edge of the bottom plate. 3. The method according to claim 1, wherein the guide groove extending to the intersection point where the branching promotion protrusion is provided extends to a position surrounding the tip of the branching promotion protrusion. A seal structure for an electric device according to any one of the above. 4. An intersecting position of the diversion-promoting protrusions is set except for an intersecting position of the corner of the bottom plate where an intersection of the guide groove and the peripheral edge of the bottom plate is a corner. The seal structure for an electric device according to any one of claims 1 to 3, wherein the seal structure is configured at a position selected according to characteristics.