JP5320587B2 - Wiring board cover structure and electrical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring board cover structure which surely accommodates a vaporized gas in a cap during the time when the vaporized gas of an electrolyte is ejected, and also to provide a wiring board device, and an electric apparatus provided with these. <P>SOLUTION: The present invention is a wiring board cover structure provided with: an electrolytic capacitor 1 including a case 3 which stores a capacitor element 1a containing an electrolyte in a sealed state and is provided with a safety valve 6 for ejecting the vaporized gas of the electrolyte in the case when the internal pressure becomes a predetermined value or more and a cap 10 which is installed to cover the safety valve 6 in this case 3 and accommodates this vaporized gas during the time when the vaporized gas of the electrolyte is ejected; a wiring board 21 on which circuit components including the electrolytic capacitor 1 are mounted; and cover members 31 and 40 which cover the wiring board 21 and are arranged with a space distance d of 1.5 mm or more between the part of the safety valve 6 of the electrolytic capacitor 1 and a section opposed thereto. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a wiring board cover structure and an electric device including the wiring board cover structure .

  Conventionally, for example, a lighting device for lighting a discharge lamp is generally configured by mounting a filter circuit, a rectifying / smoothing circuit, a high-frequency conversion circuit, a lamp lighting circuit, and the like on a wiring board. An electrolytic capacitor is connected to smooth the DC power supply. An electrolytic capacitor is usually impregnated with electrolytic solution in an electrolytic capacitor element in which electrolytic paper is sandwiched between a pair of electrodes consisting of an anode foil and a cathode foil, and a sealing rubber is attached to the impregnated element, and a bottomed cylindrical shape. It is sealed in a case.

  In the electrolytic capacitor, the electrolytic solution evaporates and decreases with time, and at the end of the life, the equivalent series resistance (ESR) of the electrolytic solution increases and the temperature rises in addition to the capacity decrease due to the decrease of the electrolytic solution. . Eventually, the heat generated by the ripple current increases, causing thermal runaway, suddenly rising in temperature, and evaporating gas of the electrolytic solution is generated exceeding the boiling point of the electrolytic solution. Therefore, there is a case where a safety valve is provided in a part of the case, and when the pressure inside the case reaches a predetermined pressure or more with the evaporation gas of the electrolyte, the safety valve is activated and the evaporation gas of the electrolyte is jetted to the outside. The case is prevented from bursting. The operation of the safety valve is a normal operation aimed at suppressing abnormal pressure rise in the case, but the evaporation gas of the electrolyte sprayed to the outside looks like smoke. The phenomenon is likely to be misidentified as a fire.

  In order to prevent such a phenomenon, an electrolytic capacitor (see Patent Document 1) having an outer airtight means for containing gas released from the safety valve to the outside, and a cap made up of a storage part, a vertical extension part and an annular extension part are attached. An electrolytic capacitor (see Patent Document 2) has been proposed. Patent Document 2 shows a configuration in which a power supply board on which such an electrolytic capacitor is mounted is provided in an electronic device.

Japanese Patent Laid-Open No. 2005-44868 JP 2006-286969 A

  However, the one shown in Patent Document 1 and Patent Document 2 is an electrolytic capacitor and a member disposed around the electrolytic capacitor in order to securely store the gas released from the safety valve to the outside airtight means or the cap, For example, no consideration is given to the positional relationship between the case for storing the substrate and other circuit components. Therefore, when the evaporated gas of the electrolytic solution is ejected, the outer hermetic means and the cap do not function normally, so that there is a problem that the evaporated gas cannot be reliably stored.

The present invention has been made in view of the above problems, and in consideration of the arrangement relationship of the electrolytic capacitors mounted on the wiring board, when the evaporated gas of the electrolytic solution is ejected, the evaporated gas can be reliably stored in the cap. It is an object of the present invention to provide a wiring board cover structure that can be used and an electric device including the same.

The wiring board cover structure according to claim 1, wherein the capacitor element including the electrolytic solution is housed in a sealed state, and a safety valve is provided for ejecting the evaporated gas of the electrolytic solution when the internal pressure becomes a predetermined value or more. The fixing means is attached to the case so as to cover the safety valve, and when the electrolyte evaporating gas is ejected , the evaporating gas is accommodated in a state of inflating in the form of a bag outward from the fixing means. An electrolytic capacitor provided with a cap having elasticity and elasticity ; a wiring board on which circuit components including the electrolytic capacitor are mounted; a portion of the electrolytic capacitor that covers the wiring board and faces the safety valve; And a cover member disposed so as to form a spatial distance of 1.5 mm or more therebetween.

  In the present invention and the following invention, unless otherwise specified, the technical meaning and interpretation are as follows. The safety valve only needs to have a function of allowing the evaporated gas of the electrolyte to escape when the internal pressure of the case exceeds a predetermined value. The form of the safety valve is not particularly limited, and the cap is made of silicone resin or the like. However, the material is not particularly limited.

  The cover member means a member that covers the mounting surface of the circuit component on the wiring board, and corresponds to, for example, a main body of a device to which the wiring board is attached, a constituent member thereof, a storage case of the wiring board, or the like.

  The wiring board cover structure according to claim 2 is the wiring board cover structure according to claim 1, wherein the wiring board has a circuit component having a mounting height dimension larger than a mounting height dimension of the electrolytic capacitor. It is comprised so that it may be comprised.

According to a third aspect of the present invention, there is provided an electrical apparatus including the wiring board cover structure according to the first or second aspect. As an electrical device, any electrical device in which an electrolytic capacitor is mounted on a wiring board can be applied without any particular limitation.

  According to the first aspect of the present invention, when the internal pressure of the case becomes equal to or higher than a predetermined value, the safety valve is activated, and the evaporated gas can be reliably stored in the cap. Therefore, the outflow of the evaporative gas can be prevented, and the user can be prevented from misidentifying that it is a fire.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, it is possible to reliably ensure a spatial distance.

According to the invention described in claim 3 , it is possible to provide an electric device that exhibits the effects described in each claim.

1 is a perspective view showing an electrolytic capacitor according to a first embodiment of the present invention. It is a front view which shows the same electrolytic capacitor. It is sectional drawing which shows the same electrolytic capacitor. It is sectional drawing which shows typically the time of the action | operation of the safety valve of the same electrolytic capacitor. It is a perspective view which shows the same wiring board apparatus. It is a side view which shows the same wiring board apparatus. It is explanatory drawing which shows typically the time of the action | operation of the safety valve of the electrolytic capacitor by the relationship with a cover member. It is a side view which shows the example which mounted the electrolytic capacitor horizontally on the wiring board. It is sectional drawing which shows a lighting fixture as the electric equipment. It is sectional drawing which expands and shows the principal part. It is a perspective view which shows the storage case of the wiring board cover structure which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the same wiring board cover structure. It is a side view which shows the dimensional relationship of the mounting height of the circuit components in a wiring board apparatus.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  First, as shown in FIGS. 1 to 4, the electrolytic capacitor 1 includes a case body 2. The case body 2 includes a bottomed cylindrical aluminum case 3 having an opening 3a, a sealing rubber 4 as a sealing material, and a heat-shrinkable insulating sleeve 5. The case 3 houses an electrolytic capacitor element 1a in which electrolytic paper is sandwiched and wound between a pair of electrodes composed of an anode foil and a cathode foil, and impregnated with, for example, an ethylene glycol-based electrolyte. A sealing rubber 4 is inserted into the opening 3 a of the case 3, and the case 3 is sealed and sealed by crimping the opening 3 a to the sealing rubber 4. The caulking portion 3b forms a ring-shaped recess.

  The case body 2 has an outer diameter D of φ10 mm or more, specifically φ16 mm, and is impregnated with 0.3 g or more of an electrolytic solution. The height dimension H is 16.5 mm.

  On the other hand, on the end surface of the case 3 opposite to the opening 3a, when the internal pressure of the case 3 exceeds a predetermined value, a part of the case 3 breaks and the safety valve 6 releases the evaporated gas of the electrolytic solution to the outside. Is provided. The safety valve 6 is configured by forming a Y-shaped thin portion in the case 3 so as to be broken when the internal pressure of the case 3 exceeds a predetermined value. This thin portion may be formed in an X shape or a K shape. Further, the outer surface of the case 3 is covered with a cylindrical insulating sleeve 5. The insulating sleeve 5 is a heat-shrinkable sleeve made of PET resin or vinyl chloride resin on which the rated voltage, capacitance, polarity, etc. are printed. After covering the case 3, heat is applied to the case by the shrinkage. 3 is coated on the outer peripheral surface. Furthermore, a lead wire 7 that is connected to the anode foil and the cathode foil and penetrates the sealing rubber 4 is led out to the opening 3 a side of the case 3.

  A cap 10 is attached to the electrolytic capacitor 1 to cover the upper surface and side peripheral surface of the case body 2 including the safety valve 6. The cap 10 is made of an elastomer made of a translucent silicone resin and a modified compound thereof, an elastomer containing a fluorine-based or polyetherimide compound, etc., and has elasticity, heat resistance, elasticity, and has a cylindrical shape. It has a cap shape and has an opening 11 at one end. Further, a thick portion 11 a having a quadrangular cross section is formed at the peripheral edge of the opening 11.

  The opening 11 side of the cap 10 is fixed to the case 3 by winding a wire member 12 as a fixing means from the outer peripheral side. The wire member 12 is attached by using the caulking portion 3b of the opening 3a of the case 3 to secure the cap 10 securely. The fixing means can be made of a synthetic resin or a metal material, may be formed in a C shape, and may be a band-shaped metal fitting.

  Therefore, the space between the inside of the cap 10 and the outside of the case 3 is hermetically sealed, and the case 3 is hermetically covered with the cap 10. The cap 10 is preferably formed of a material having high stretchability, heat resistance, elasticity, and high erosion resistance against the electrolytic solution.

Next, the operation of the electrolytic capacitor 1 configured as described above will be described with reference to FIG. A safety valve 6 is provided to prevent the case 3 from rupturing when an overvoltage is applied to the electrolytic capacitor 1 or when the pressure in the case 3 reaches a predetermined pressure or higher due to the evaporation gas of the electrolytic solution at the end of life. It operates, the Y-shaped thin part is broken, and the evaporated gas of the electrolytic solution is ejected to the outside. Moreover, combustible gas and off-flavor may be generated. Since the cap 10 has elasticity and covers the case main body 2 in an airtight manner, the cap 10 can swell, and when the safety valve 6 is operated , the wire member 12 that is a fixing means is fixed by the ejection pressure of the evaporated gas. As a starting point, it is in a bag-like state that bulges outward. In this state, the evaporative gas stays in the cap 10 and thus can be prevented from flowing out. At this time, since the cap 10 is fixed to the opening 11 side by the wire member 12, it is prevented from being detached from the case 3 by the jetting pressure of the evaporating gas, and the attached state can be reliably maintained.

  Basically, as described above, detachment of the cap 10 is suppressed, but when the electrolyte evaporating gas is ejected, a part of the liquefied evaporating gas is formed between the outer surface of the case body 2 and the inner surface of the cap 10. The liquefied evaporative gas enters between the outer surface of the case body 2 and the inner surface of the cap 10 at the portion of the caulking portion 3b to which the wire member 12 is attached. There are cases where it acts like a kind of lubricant. In such a case, there is a possibility that the inner surface of the cap 10 slides on the outer surface of the case body 2 due to the ejection pressure of the evaporated gas, the cap 10 moves upward, and the cap 10 is detached from the case 3.

  However, in the present embodiment, even if the inner surface of the cap 10 slides on the outer surface of the case body 2 and the cap 10 moves upward, the thick portion 11a is formed in the opening 11 of the cap 10. Therefore, the movement of the cap 10 is stopped. That is, since the thick portion 11a cannot pass between the inner diameter side of the wire member 12 and the outer surface side of the case body 2 due to the thickness, the cap portion 10 is caught by the wire member 12 and the case 10 It is deterred from leaving and is held securely. In the configuration as described above, the wire member 12 suppresses the cap 10 from being detached from the case 3, and the thick portion 11a plays a role of reinforcing this suppression action.

  Next, the wiring board device 20 will be described with reference to FIGS. The wiring board device 20 constitutes, for example, a fluorescent lamp lighting device, and is mounted on the wiring board 21 so that the electrolytic capacitor 1 is erected, and other electronic circuit components including the electrolytic capacitor 1. That is, a winding part such as a transformer T and a coil, a switching element such as a transistor Q, a diode D, a capacitor C, a resistance element R, and the like are mounted.

  Then, when the electrolytic gas evaporates, the cap 10 swells and functions normally so that the evaporative gas can be reliably accommodated in the cap 10. Are implemented so that they are not placed close together. If other circuit components are arranged in a state of being close to or in contact with the electrolytic capacitor 1 in order to increase the mounting density of the circuit components on the wiring board, other circuits will be generated when the evaporated gas of the electrolyte is ejected. This is because the cap 10 is prevented from expanding by the parts, and the cap 10 is damaged and the evaporative gas cannot be reliably stored, and the evaporative gas may be ejected to the outside. Such a phenomenon is caused by the fact that when the cap 10 swells, pressure is applied from other circuit components as a reaction of the internal pressure, and the wall thickness of the cap 10 becomes thin, so that the cap 10 is easily damaged. Yes.

  In the present embodiment, in particular, in the case of a circuit component having an edge-shaped portion, for example, a transformer T, consideration is given so that corners E of the outer case constituting the transformer T are not arranged close to each other. This edge-shaped part is not limited to the corner E of the outer case of the transformer T, but means a part that may be damaged when the cap 10 swells.

  In order to prevent other circuit components from being arranged close to each other around the electrolytic capacitor 1, specifically, the electrolytic capacitor 1 and the other circuit components must be spaced at least 1 mm, preferably The cap 10 is separated by an interval of more than half (D / 2) of the outer diameter D of the case body 2 of the electrolytic capacitor 1, that is, 8 mm or more, more preferably, the outer diameter D or more, that is, 16 mm or more. When the swells, it can be prevented from being damaged.

  Similarly, considering that the wiring board device 20 is attached to the storage case or the luminaire main body, the electrolytic capacitor 1 is preferably provided from the end of the wiring board 21 in order not to prevent the cap 10 from expanding. Is more than half (D / 2) of the outer diameter D of the case body 2 of the electrolytic capacitor 1, that is, 8 mm or more, more preferably, the outer diameter D is more than 16 mm. It is desirable to do.

  Further, in order to suppress deterioration due to the temperature rise of the electrolytic capacitor 1, consideration is given so that no heat generating component such as a wound component or a switching element is disposed in the vicinity of the electrolytic capacitor 1. Reference numeral 22 denotes an attachment member to a storage case or the like provided as necessary.

  Next, in the wiring board device 20 configured as described above, the mounting surface side of the wiring board 21 is generally covered with a cover member, that is, a member such as a storage case or an apparatus main body of the wiring board device 20. It becomes a structure. In this case, when the internal pressure of the case 3 becomes equal to or higher than a predetermined value, the safety valve 6 is actuated, and the cap 10 swells due to the ejection of the evaporating gas. Therefore, it is necessary to form a predetermined spatial distance d between the portion of the safety valve 6 of the electrolytic capacitor 1 and the portion of the cover member facing the safety valve 6.

  As shown in FIG. 7, the inventor conducted experiments and measurements to find a predetermined spatial distance d between the electrolytic capacitor 1 and the cover member C. As a result, the spatial distance d needs to be at least 1.5 mm, and if it is 1.5 mm or more, the safety valve 6 can be operated and the cap 10 can bulge in the lateral direction, and evaporative gas can be accommodated in the cap 10. It turned out to be.

  In view of the operation of the safety valve 6 and the functioning of the cap 10 more normally, the spatial distance d is preferably more than half (H / 2) of the height dimension H of the case body 2 of the electrolytic capacitor 1. In other words, it has come to the view that it is desirable to set the height dimension to be not less than 8.25 mm, more preferably not less than the height dimension H, that is, not less than 16.5 mm.

  In addition, as shown in FIG. 8, when the electrolytic capacitor 1 is mounted on the wiring board 21 in the horizontal direction, the above-described configuration can be used. That is, by mounting so that other circuit components are not disposed close to the periphery of the electrolytic capacitor 1 mounted sideways, the cap 10 swells and functions normally when the evaporated gas of the electrolytic solution is ejected. Evaporative gas can be reliably accommodated.

  Subsequently, a lighting fixture 30 as an electric device in which the wiring board device 20 is incorporated will be described with reference to FIGS. 9 and 10. The lighting fixture 30 shows a wiring board cover structure in which the wiring board device 20 is covered with a reflection plate 31 as a cover member.

  9, the lighting fixture 30 includes an annular fluorescent lamp 32 as a light source, a fixture main body 33, a wiring board device 20 as a lighting device, a shade 34, and the like.

  The appliance main body 33 has a disk-like appearance and is formed thin, and the upper surface side is an attachment surface to the ceiling surface. A circular dish-shaped reflecting plate 31 is provided on the lower surface side of the instrument main body 33, and a storage part 35 is formed by the instrument main body 33 and the reflective plate 31. In the storage part 35, the wiring board device 20 is provided. It is arranged. In addition, a pair of sockets 36 are disposed on the reflecting plate 31 corresponding to the positions where the two annular fluorescent lamps 32 are disposed. Furthermore, a shade 34 having translucency and diffusibility that covers the lower surface side and the side of the instrument body 33 is attached to the instrument body 33.

  In the lighting fixture 30 configured as described above, as shown in FIG. 10, the wiring board device 20 is attached to the fixture main body 33 and is covered with the reflection plate 31 as a cover member. In this case, a predetermined spatial distance d is secured at the part of the reflector 31 facing the safety valve 6 of the electrolytic capacitor 1 as described above. Therefore, when the internal pressure of the case 3 becomes equal to or higher than the predetermined value, the safety valve 6 is activated, and the cap 10 swells due to the ejection of the evaporating gas, and functions normally so that the evaporating gas can be reliably accommodated in the cap 10. .

  As described above, according to the present embodiment, the electrolytic capacitor 1 is mounted so that other circuit components are not disposed close to each other, so that when the electrolytic gas evaporates, the cap 10 Swells and functions normally, and evaporative gas can be reliably accommodated in the cap 10. Further, since the space distance of 1.5 mm or more is formed between the portion of the safety valve 6 of the electrolytic capacitor 1 and the portion of the reflecting plate 31 facing the portion, the internal pressure of the case 3 becomes a predetermined value or more. When the safety valve 6 is activated, the cap 10 swells due to the ejection of the evaporating gas, and functions normally, so that the evaporating gas can be reliably accommodated in the cap 10.

  Therefore, when the safety valve 6 of the electrolytic capacitor 1 is activated and the evaporation gas of the electrolytic solution is ejected, the cap 10 can prevent the evaporation gas from flowing to the outside and prevent the user from misidentifying that it is a fire. it can.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted. In the present embodiment, a wiring board cover structure is shown in which the wiring board device 20 is covered and stored in a storage case 40 as a cover member.

  The storage case 40 is made of metal and is formed in a rectangular box shape. For example, the storage case 40 is disposed so as to cover the wiring board device 20 attached to the luminaire main body 33 from the mounting surface side of the wiring board 21. In this case, the portion of the storage case 40 facing the safety valve 6 of the electrolytic capacitor 1 is ensured with the predetermined spatial distance d as described above. Therefore, when the internal pressure of the case 3 becomes equal to or higher than the predetermined value, the safety valve 6 is activated, and the cap 10 swells due to the ejection of the evaporating gas, and functions normally so that the evaporating gas can be reliably accommodated in the cap 10. .

The form of the storage case 40 is not limited to that shown in the present embodiment. For example, the wiring board device 20 may be integrally stored so that the wiring board device 20 can be handled as a single component.
As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained.

  Next, as shown in FIG. 13, in the wiring board device 20, a circuit component having a mounting height dimension larger than the mounting height dimension of the electrolytic capacitor 1 is mounted on the wiring board 21. . Specifically, the transformer T mounted on both sides of the electrolytic capacitor 1 is higher than the mounting height of the electrolytic capacitor 1. Accordingly, when the cover member C is disposed on the wiring board device 20 in relation to the cover member C (shown by a broken line) that covers the wiring board device 20, the cover member C first collides with the upper surface of the transformer T. Due to the dimensional relationship, a predetermined spatial distance d is necessarily secured. Therefore, the space distance d can be reliably ensured.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the electrical device is not limited to a lighting fixture, and can be applied to other electrical devices using an electrolytic capacitor.

DESCRIPTION OF SYMBOLS 1 ... Electrolytic capacitor, 1a ... Capacitor element, 3 ... Case,
3b ... crimping part, 6 ... safety valve, 10 ... cap, 20 ... wiring board device,

21 ... Wiring board, 30 ... Electrical equipment (lighting fixture), 31 ... Cover member (reflecting plate), 40 ... Cover member (storage case), C ... Cover member, d ...・ Space distance,
E ... Edge-shaped part

Claims (3)

A case in which a capacitor element containing an electrolytic solution is housed in a sealed state and a safety valve is provided for ejecting evaporated gas of the electrolytic solution when the internal pressure exceeds a predetermined level, and a fixing means for covering the safety valve in this case attached by, when the evaporation gas of the electrolyte solution is released, and a cap having a stretchability and elasticity vapor is housed in a state bulging a bag-like outwardly starting the fixing means With electrolytic capacitors;
A wiring board on which circuit components including an electrolytic capacitor are mounted;
A cover member that covers the wiring board and is disposed so as to form a spatial distance of 1.5 mm or more between a portion of the safety valve of the electrolytic capacitor and a portion facing the safety valve;
A wiring board cover structure comprising:   The wiring board cover structure according to claim 1, wherein the wiring board is configured such that a circuit component having a mounting height dimension larger than a mounting height dimension of the electrolytic capacitor exists. An electrical apparatus comprising the wiring board cover structure according to claim 1 .

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