CN217115578U - Terminal box - Google Patents

Abstract

A junction box relates to the field of line communication and comprises: the box cover is provided with a retractable buffer cavity at one side, and the inner cavity of the buffer cavity is communicated with the inner cavity of the box cover; can be used for containing sealing glue. Can be through setting up collapsible buffering cavity, can be when carrying out the injecting glue in holding the chamber, the expansion through buffering cavity makes sealed glue also can get into buffering cavity simultaneously, after the injecting glue is accomplished, when sealed refrigerated in-process shrinks gradually, at this moment, can be through the gradual shrink of buffering cavity, extrude sealed glue in the buffering cavity to holding in the chamber, thereby compensate the difference that sealed glue cooling back volume in holding the chamber reduces, thereby guaranteed sealed glue and be full of the chamber that holds after the cooling all the time, thereby fundamentally has avoided because sealed glue cooling volume diminishes and lead to the air to get into and hold the problem that the chamber produced the bubble.

Description

Terminal box

Technical Field

The utility model relates to a circuit intercommunication field particularly, relates to a terminal box.

Background

At present, the current terminal box can wrap up the joint of circuit, avoids the direct exposure of joint in the air, causes the condition of short circuit even personnel's electric shock, but its leakproofness is poor, intakes easily in the gap of terminal box to lead to the joint short circuit of circuit.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a terminal box, it can guarantee good leakproofness, avoids the terminal box to intake at long-term practical in-process, and leads to circuit joint department to cause the emergence of short circuit scheduling problem.

The embodiment of the utility model is realized like this:

a junction box, comprising: the box cover is provided with a retractable buffer cavity at one side, and the inner cavity of the buffer cavity is communicated with the inner cavity of the box cover; can be used for containing sealing glue.

Further, the buffer chamber is made of an elastic material.

Furthermore, the buffer chamber and the box cover are integrally formed.

Further, the buffer chamber includes: the connecting part is arranged on one side of the buffering part, extends along the circumferential direction of the buffering part and is connected end to end; one side of the connecting part, which is far away from the buffering part, is connected with the box cover.

Further, the buffer portion has a corrugated structure.

Further, the buffer part is circular.

Furthermore, the buffer part comprises a support member, a first annular buffer groove, a second annular buffer groove and a third annular buffer groove, and the support member is arranged in the inner cavity of the first annular buffer groove to seal the annular inner cavity of the first annular buffer groove;

the second annular buffer groove is concentrically arranged with the first annular buffer groove, the radius of the second annular buffer groove is larger than that of the first annular buffer groove, the directions of the notches of the first annular buffer groove and the second annular buffer groove are the same, and the connecting part is arranged on the outer wall of one side, far away from the first annular buffer groove, of the second annular buffer groove;

the third annular buffer groove is arranged between the first annular buffer groove and the second annular buffer groove, the outer wall of the third annular buffer groove is connected with the inner wall of the second annular buffer groove, and the inner wall of the third annular buffer groove is connected with the outer wall of the first annular buffer groove; the direction of the notch of the third annular buffer groove is opposite to that of the notch of the first annular buffer groove.

Furthermore, the supporting member is hemispherical, and the opening direction of the supporting member is opposite to the direction of the notch of the first annular buffer groove.

Furthermore, the box cover and the buffer chamber are both made of transparent materials.

The embodiment of the utility model provides a beneficial effect is:

the embodiment of the utility model provides a terminal box, can be through setting up collapsible buffering cavity, can be when carrying out the injecting glue in holding the chamber, the expansion through buffering cavity makes sealed glue also can get into the buffering cavity simultaneously, after the injecting glue is accomplished, when sealed refrigerated in-process shrinks gradually, at this moment, can be through the gradual shrink of buffering cavity, extrude sealed glue in the buffering cavity to holding in the chamber, thereby compensate the difference that sealed glue cooling back volume in holding the chamber reduces, thereby guaranteed sealed glue and be full of all the time and hold the chamber after the cooling, thereby fundamentally has avoided leading to the air to get into the problem that holds the chamber gassing because sealed glue cooling volume diminishes.

Generally, the embodiment of the utility model provides a terminal box, it can guarantee good leakproofness, avoids the terminal box to intake at long-term practical in-process, and leads to circuit joint department to cause the emergence of short circuit scheduling problem.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a junction box according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first box flap according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second box flap according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a protective shell according to an embodiment of the present invention;

fig. 5 is a top view of a first cartridge flap provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 7 is a cross-sectional view of the buffer chamber in the glue filling state according to the embodiment of the present invention;

fig. 8 is a schematic diagram of a conventional junction box after glue filling.

Icon: 100-box cover, 110-first box flap, 120-second box flap and 130-containing cavity;

200-buffer chamber, 210-connecting part, 220-buffer part, 221-supporting member, 222-first annular buffer groove, 223-second annular buffer groove, 224-third annular buffer groove;

300-glue injection hole, 400-exhaust hole and 500-protective shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "parallel," "perpendicular," and the like do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1, the present embodiment provides a junction box, including: a cartridge cover 100 and a buffer chamber 200.

Wherein, one side of the box cover 100 is provided with a retractable buffer chamber 200, and the inner cavity of the buffer chamber 200 is communicated with the inner cavity of the box cover 100; can be used for containing sealing glue.

It should be noted that, the box cover 100 includes a first box flap 110 and a second box flap 120 that are fastened to each other (fastening means that detachable connection is performed between the first box flap 110 and the second box flap 120, and in order to prevent water from entering, a certain sealing performance is ensured after the first box flap 110 and the second box flap 120 are fastened), and a containing cavity 130 for containing a line connector is provided between the first box flap 110 and the second box flap 120, (currently, a circuit board spot welding mode is adopted, connectors at two ends are all welded on a circuit board, so as to achieve circuit communication, and at this time, the circuit board is placed in the containing cavity 130).

In addition, in the prior art, in order to ensure the sealing performance inside the junction box, a conventional method is to fill the sealant, a sealant injection hole 300 is formed in one end of the first box flap 110, a vent hole 400 is formed in the other end of the first box flap 400 (the aperture of the vent hole 400 is smaller than that of the sealant injection hole 300), the sealant is injected into the accommodating cavity 130 through the sealant injection hole 300, the circuit board or the circuit connector is covered until the accommodating cavity 130 is completely filled with the sealant and then flows out of the vent hole 400, so that the accommodating cavity 130 is filled with the sealant, and the sealing effect on the circuit board is ensured.

However, after many experiments, the applicant finds that the volume of the sealant is reduced in the cooling process due to the influence of the factors of thermal expansion and cold contraction, which causes the sealant in the accommodating cavity 130 to gradually shrink in the cooling process, thereby causing external air to enter the accommodating cavity 130 to form bubbles, which are most likely to be located at the welding point position of the circuit board, as shown in fig. 8, which causes the welding point position not to be sealed, and external rain water and the like to enter the accommodating cavity 130 to contact with the welding point position, which causes short circuit.

It should be noted that the pressure generated by the buffer chamber 200 during the contraction process is higher than the pressure of the outside air entering the glue injection hole 300 and the air outlet hole 400, so as to ensure the normal contraction of the buffer chamber 200 and ensure that the air does not enter the accommodating cavity 130.

Can be through setting up collapsible buffer chamber 200, can be when carrying out the injecting glue in holding chamber 130, the expansion through buffer chamber 200 makes sealed glue also can get into buffer chamber 200 simultaneously, after the injecting glue is accomplished, when sealed refrigerated in-process shrinks gradually, at this moment, can be through the gradual shrink of buffer chamber 200, extrude to holding chamber 130 in sealed glue in the buffer chamber 200, thereby compensate the difference that sealed glue cooling back volume in holding chamber 130 reduces, thereby guaranteed sealed glue and be full of all the time and hold chamber 130 after the cooling, thereby fundamentally has avoided because sealed glue cooling volume diminishes and lead to the air to get into the problem that holds chamber 130 production bubble, and then guarantee the complete sealing of solder joint position.

Generally, the embodiment of the utility model provides a terminal box, it can guarantee good leakproofness, avoids the terminal box to intake at long-term practical in-process, and leads to circuit joint department to cause the emergence of short circuit scheduling problem.

Further, in order to simplify the structure of the buffer chamber 200, the manufacturing cost is reduced; in this embodiment, the buffer chamber 200 is made of an elastic material. This kind of design, can utilize the elasticity of buffer chamber 200, when carrying out the injecting glue to holding chamber 130, sealed glue gets into sealed chamber inner chamber, can be under the effect of injecting glue pressure, make buffer chamber 200 be in the state of expansion, after the injecting glue is accomplished, sealed glue in holding chamber 130 dwindles at refrigerated in-process volume gradually, at this moment, sealed glue reduces (is less than buffer chamber 200's elasticity) to buffer chamber 200's pressure, thereby buffer chamber 200 is gradual shrink on the basis of self elasticity, the volume of buffer chamber 200 inner chamber in this in-process constantly dwindles, extrude to holding chamber 130 with sealed glue in its inner chamber, compensate the volume difference that sealed glue reduces because of the cooling in holding chamber 130, guaranteed that sealed glue is full of and hold chamber 130 all the time, thereby avoided the air admission to hold in chamber 130.

In this embodiment, the buffer chamber 200 may be made of materials such as Polyoxymethylene (POM), polypropylene, polyethylene, etc., but is not limited to one of them.

Further, in order to ensure stability in the practical process and ensure more stable connection between the buffer chamber 200 and the first case flap 110, in this embodiment, the buffer chamber 200 is integrally formed with the case cover 100.

Further, in order to make the structure of the buffer chamber 200 more stable, the buffer chamber 200 in this embodiment includes: the connecting part 210 is arranged on one side of the buffer part 220, and the connecting part 210 extends along the circumferential direction of the buffer part 220 and is connected end to end; the side of the connection part 210 away from the buffer part 220 is connected with the box cover 100.

In this embodiment, a side of the connecting portion 210 away from the buffering portion 220 faces a side of the first box flap 110, and an included angle between the connecting portion 210 and the buffering portion 220 is an obtuse angle.

In addition, it should be noted that, the connection portion 210 and the buffer portion 220 are integrally formed, so that stability and reliability of connection are ensured.

Further, in order to further improve the elasticity of the buffer portion 220 itself, in the present embodiment, the buffer portion 220 has a corrugated structure.

Specifically, the buffer part 220 includes a support member 221, a first annular buffer groove 222, a second annular buffer groove 223 and a third annular buffer groove 224, the support member 221 is disposed in an inner cavity of the first annular support groove to seal the annular inner cavity of the first annular buffer groove 222;

the second annular buffer groove 223 is concentrically arranged with the first annular buffer groove 222, the radius of the second annular buffer groove 223 is larger than that of the first annular buffer groove 222, the notch directions of the first annular buffer groove 222 and the second annular buffer groove 223 are the same, and the connecting part 210 is arranged on the outer wall of one side, away from the first annular buffer groove 222, of the second annular buffer groove 223;

the third annular buffer groove 224 is arranged between the first annular buffer groove and the second annular buffer groove 223, the outer wall of the third annular buffer groove 224 is connected with the inner wall of the second annular buffer groove 223, and the inner wall of the third annular buffer groove 224 is connected with the outer wall of the first annular buffer groove 222; the notch direction of the third annular buffer groove 224 is opposite to the notch direction of the first annular buffer groove 222.

In addition, the supporting member 221 has a hemispherical shape, and an opening direction thereof is opposite to a notch direction of the first annular buffer groove 222.

It should be noted that the difference between the radii of the first and second ring buffer grooves 222 and 223 is the same as the groove width of the third ring buffer groove 224.

It should be noted that, in this embodiment, it is not limited to only the first annular buffer slot 222, the second annular buffer slot 223 and the third annular buffer slot 224, in the actual production process, the annular buffer slots may be added according to actual requirements, and the first annular buffer slot 222 extends outward during the setting process, which is not described herein.

In this embodiment, the widths of the first annular buffer groove 222, the second annular buffer groove 223 and the third annular buffer groove 224 are the same, so as to ensure that the buffer chamber 200 is stressed uniformly in the contraction or expansion process.

Through the arrangement of the corrugated structure, the structural performance of contraction and expansion of the corrugated structure can be utilized, the elastic change brought by the structure is further utilized on the elastic basis of the material of the buffer chamber 200, and the contraction range of the buffer chamber 200 is improved, so that the air can be more effectively prevented from entering the accommodating cavity 130.

Further, in order to ensure that the buffer portion 220 is more stable during the contraction movement, in the embodiment, the buffer portion 220 is circular. This kind of design can guarantee that buffer 220 is producing the in-process of deformation, and the inseparabler of being connected between the first box lamella 110 to, circular design can more effectual elimination reaction force, makes buffer chamber 200 in the deformation in-process, more stable.

In addition, the existing junction box is mostly designed in an opaque way, so that the reason that bubbles are generated due to thermal expansion and cold contraction of sealant cannot be found after glue injection is carried out, and the problem that the short circuit is caused when water is met although the sealant is used for sealing is finally caused; for the above reasons, after the applicant performs short circuit detection through many experiments, it is determined that the short circuit is caused by incomplete sealing inside the junction box before the short circuit is finally caused, and thus, in this embodiment, both the box cover 100 and the buffer chamber 200 are made of transparent materials. Through the design, whether bubbles exist in the sealant after the junction box is sealed can be more clearly seen, and the normal operation of subsequent quality inspection work is more convenient.

It should be noted that in this embodiment, the material for manufacturing the buffer chamber 200 should have elasticity and transparency, so that the material is more preferable to polypropylene, and other materials that satisfy elasticity and transparency in the prior art may also be used, which is not described herein.

In addition, in the specific implementation process, a protective shell 500 is further arranged outside the junction box, and the protective shell 500 is detachably connected with the junction box.

In addition, it should be further described that the junction box in this embodiment is mainly used in the field of electric blankets, but is not limited to the field of electric blankets, and may also be used in other fields requiring wire sealing.

The working principle of the junction box is as follows: firstly, a circuit board of a wiring is placed in the accommodating cavity 130 between the first box flap 110 and the second box flap 120, then the first box flap 110 and the second box flap 120 are buckled, glue is injected into the glue injection holes 300, the sealant enters the accommodating cavity 130 and the buffer cavity 200, air in the accommodating cavity 130 is exhausted through the vent holes 400, the buffer part 220 is in an expansion state under the action of injection pressure of the sealant, the volume of the buffer cavity 200 is increased, more sealant is accommodated until the sealant flows out of the vent holes 400, the glue injection is finished, the volume of the sealant is reduced in the process of cooling the sealant, the pressure caused to the buffer part 220 is smaller than the self elasticity of the buffer part 220, then the buffer part 220 is gradually contracted along with the reduction of the volume of the sealant, at the moment, the volume in the buffer cavity 200 is reduced, the sealant in the inner cavity of the buffer part is compressed into the accommodating cavity 130, and the reduced volume of the sealant in the accommodating cavity 130 is compensated, thereby making sealed glue fill up all the time and holding chamber 130, avoid the air admission to hold chamber 130.

To sum up, the utility model discloses it can guarantee good leakproofness, avoids the terminal box to intake at long-term practical in-process, and leads to line joint department to cause the emergence of short circuit scheduling problem.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A junction box, comprising: the box cover is provided with a retractable buffer cavity at one side, and the inner cavity of the buffer cavity is communicated with the inner cavity of the box cover; can be used for containing sealant;

the buffer chamber includes: the connecting part is arranged on one side of the buffering part, extends along the circumferential direction of the buffering part and is connected end to end; one side of the connecting part, which is far away from the buffering part, is connected with the box cover.

2. The junction box of claim 1, wherein said buffer chamber is made of an elastic material.

3. The junction box of claim 1, wherein said buffer chamber is integrally formed with said box cover.

4. The junction box of claim 1, wherein said buffer is a corrugated structure.

5. The junction box of claim 1, wherein said cushioning portion is circular.

6. The junction box according to claim 1, wherein the buffer portion includes a support member provided in an inner cavity of the first annular buffer groove to seal the annular inner cavity of the first annular buffer groove, a second annular buffer groove, and a third annular buffer groove;

the second annular buffer groove is concentrically arranged with the first annular buffer groove, the radius of the second annular buffer groove is larger than that of the first annular buffer groove, the directions of the notches of the first annular buffer groove and the second annular buffer groove are the same, and the connecting part is arranged on the outer wall of one side, away from the first annular buffer groove, of the second annular buffer groove;

the third annular buffer groove is arranged between the first annular buffer groove and the second annular buffer groove, the outer wall of the third annular buffer groove is connected with the inner wall of the second annular buffer groove, and the inner wall of the third annular buffer groove is connected with the outer wall of the first annular buffer groove; the direction of the notch of the third annular buffer groove is opposite to that of the notch of the first annular buffer groove.

7. The junction box of claim 6, wherein said support member is formed in a hemispherical shape and has an opening direction opposite to a notch direction of said first annular buffer groove.

8. The junction box of claim 1, wherein said box cover and said buffer chamber are made of transparent material.

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