JP2014116522A - Capacitor assembly module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety by surely preventing damage in the case where an explosion-proof valve part is operated, and to facilitate assembly to a substrate.SOLUTION: A capacitor assembly module 10 disposes two electrolytic capacitors 12 including explosion-proof valve parts in front ends and lead terminals in rear ends on a substrate 14 in the state where the capacitors are arranged side by side in the lateral direction and installed horizontally. In a capacitor housing part 16, cylindrical holes 18 are provided consecutively side by side in the lateral direction for housing the front end sides of the electrolytic capacitors 12 including the explosion-proof valve parts. A capacitor mounting part 20 is provided integrally in an axial direction of the cylindrical holes 18, and semi-cylindrical portions 22 opened upward are provided consecutively side by side in the lateral direction. A gap is formed by providing a protrusion between the explosion-proof valve part in the front end of the electrolytic capacitor 12 housed in the cylindrical hole 18 and an end face of the cylindrical hole, and the gap is communicated to the outside by forming a discharge path 32 in an axial direction of a partition wall 30 partitioning the cylindrical holes.

Description

The present invention relates to a capacitor built-in module in which a plurality of electrolytic capacitors provided with explosion-proof valve portions are arranged on a substrate in a state where they are placed side by side.

  Conventionally, for example, the one shown in FIG. 8 is known as a capacitor built-in module in which an electrolytic capacitor having an explosion-proof valve is housed in a holder and placed horizontally on a substrate.

  As shown in FIG. 8, 101 is an electrolytic capacitor, 102 is a capacitor holder, and has two lead legs 102b for soldering to a printed circuit board 103.

  With the explosion-proof valve portion 101a of the electrolytic capacitor 101 inserted into the opening 102c of the capacitor holder 102, the lead terminal 101b of the electrolytic capacitor 101 and the lead foot portion 102b of the capacitor holder 102 are inserted into the land holes provided in advance on the printed circuit board 103. Are fixed to the circuit board 103 by soldering.

  A gap 104 is provided between the explosion-proof valve portion 101a of the electrolytic capacitor 101 and the inner wall portion 102a of the capacitor holder 102, and a space for opening the explosion-proof valve portion 101a is secured.

  When the electrolytic capacitors 101 are arranged in two rows, as shown in FIG. 9, the claw portions 102e and 102f are arranged in a staggered manner on the capacitor holder 102, thereby arranging the electrolytic capacitors 101 in two rows. In addition, useless space is prevented from being generated on the printed circuit board.

  As a result, even if the explosion-proof valve portion 101a of the electrolytic capacitor 101 mounted horizontally is activated and the electrolyte leaks, it can be suppressed in the capacitor holder 102, and even if the electrolyte is ignited, the capacitor holder 102 causes the electrolytic capacitor to Since the 101 explosion-proof valve portion 101a is covered, the suffocation can be extinguished. At the same time, it is possible to obtain a power supply circuit that can fix an unstable electrolytic capacitor lying on its side with a capacitor holder alone. Also, by placing the electrolytic capacitor 101 horizontally on the printed circuit board 103 by the capacitor holder 102, the height of the casing of an appropriate device incorporating the electrolytic capacitor can be reduced as compared with the case where the electrolytic capacitor is placed vertically. It can be downsized.

Japanese Patent Laid-Open No. 2002-345262

  However, in such a conventional capacitor built-in module, since it is necessary to provide a gap 104 necessary for extinguishing suffocation at the top of the electrolytic capacitor 101 housed in the capacitor holder 102, the large-sized electrolyte solution is large. In the case of an electrolytic capacitor, it is necessary to make the gap 104 large, which is an adverse effect of downsizing.

  Further, when the explosion-proof valve portion 101a is activated (ruptured), if the amount of gas ejected from the electrolytic capacitor to the gap 104 is large, the capacitor holder 102 is damaged without being able to withstand the pressure ejected, and the capacitor holder 102 There were safety problems such as splashing.

  Further, when the electrolytic capacitors are arranged in two rows on the printed circuit board, it is necessary to separately arrange the capacitor holders 102 having the claw portions 102e and 102f arranged in a staggered manner, and the mounting work on the printed circuit board becomes complicated. There's a problem.

The present invention provides a capacitor built-in module having a structure that facilitates assembly of a plurality of electrolytic capacitors to a substrate while reliably preventing breakage when an explosion-proof valve section is operated and improving safety. With the goal.

The present invention is an insulating capacitor built-in module in which a plurality of electrolytic capacitors provided with an explosion-proof valve portion at the front end and provided with a lead terminal at the rear end are arranged on a substrate in a state where they are placed side by side horizontally.
A capacitor housing part in which a plurality of cylindrical holes for housing the tip side including the explosion-proof valve parts of a plurality of electrolytic capacitors are arranged side by side;
A capacitor mounting portion that is integrally provided in the axial direction of a plurality of cylindrical holes and that is arranged side by side with a semi-cylindrical portion that opens upward, an explosion-proof valve portion at the tip of an electrolytic capacitor housed in the cylindrical hole, and a cylindrical hole end surface A protrusion that forms a gap between
A discharge path that is formed in the axial direction of the partition wall surface that partitions the plurality of cylindrical holes, and that communicates the gap formed by the protrusion to the outside,
It is provided with.

  The discharge path is formed at the uppermost portion of the partition wall that partitions the cylindrical hole that houses the plurality of electrolytic capacitors.

  In addition, a lead holding portion is provided which is formed integrally with the end portion of the capacitor mounting portion and holds the lead terminals of the plurality of electrolytic capacitors in a state bent to the substrate side.

Furthermore, a connection pin that protrudes from the substrate mounting surface of the capacitor housing portion and is solder-connected to the substrate is provided.

  According to the capacitor built-in module of the present invention, a protrusion is provided between the explosion-proof valve portion at the tip of the electrolytic capacitor housed in the cylindrical hole of the capacitor housing portion and the end surface of the cylindrical hole, and a gap is formed. Since the discharge path is formed in the axial direction of the partition wall that partitions the cylindrical hole and communicates with the outside, the high-pressure gas containing water vapor discharged from the electrolytic capacitor due to the operation (rupture) of the explosion-proof valve section Is discharged outside through the discharge path formed in the axial direction of the partition wall that partitions the cylindrical holes containing the plurality of electrolytic capacitors, and the pressure in the gap at the top of the capacitor does not increase. It is possible to reliably prevent scattering due to breakage and improve safety.

  In addition, a plurality of electrolytic capacitors are installed side by side in the capacitor built-in module, and they are combined into one, even if there are multiple electrolytic capacitors. And easily.

  In addition, since the gap at the top of the capacitor communicates with the outside air via the discharge path, it is sufficient that the gap is sufficient for the explosion-proof valve portion to operate, and the electrolytic capacitor becomes larger and the amount of electrolyte increases. However, there is no need to increase the gap at the top of the capacitor, and the module can be downsized.

  In addition, the discharge path is formed at the upper part of the partition wall that partitions the cylindrical holes that store multiple electrolytic capacitors, so that even if the electrolyte leaks into the gap at the top of the capacitor due to the operation of the explosion-proof valve, Until the liquid is filled with the electrolyte, it does not leak to the outside through the discharge path, and leakage of the electrolyte can be suppressed.

  In addition, since the lead holding part is provided at the end of the capacitor mounting part and the lead terminal of the electrolytic capacitor is held in a bent state on the substrate side, the accuracy of positioning the electrolytic capacitor in the capacitor module is improved. The workability when mounted on a substrate and the vibration resistance after mounting can be improved.

Furthermore, since the connection pins that protrude from the substrate mounting surface of the capacitor housing portion and are solder-connected to the substrate are provided, the vibration resistance when mounted on the substrate can be improved.

A perspective view showing an embodiment of a capacitor built-in module according to the present invention in which two electrolytic capacitors are arranged in two horizontal rows. The perspective view which showed the capacitor built-in module in the state where the electrolytic capacitor was removed Perspective view showing the bottom side of the capacitor built-in module Side view of capacitor built-in module Cross-sectional view of capacitor built-in module in the axial direction The perspective view which showed the capacitor built-in module seen from the capacitor insertion side Sectional drawing which showed the cross section of the capacitor storage part in a capacitor built-in module A perspective view showing a conventional capacitor built-in module A perspective view showing a conventional capacitor built-in module in which electrolytic capacitors are arranged in two rows.

  An embodiment of a capacitor built-in module according to the present invention will be described with reference to FIGS. 1 to 7 as follows.

  As shown in FIGS. 1, 2, and 4, the capacitor built-in module 10 of the present embodiment is provided with an explosion-proof valve portion 12 a (see FIG. 5) at the front end and two lead terminals 12 b at the rear end. Two electrolytic capacitors 12 are arranged on the substrate 14 in a state where they are placed side by side.

  Examples of the explosion-proof valve portion 12a of the electrolytic capacitor 12 include a concave groove portion (weak point portion) provided on the bottom surface of a metal case such as aluminum. When the internal pressure of the electrolytic capacitor 12 increases due to some cause, the bottom surface of the metal case swells, and the explosion-proof valve portion 12a operates by using the groove as a trigger.

  The capacitor assembly module 10 integrally includes a capacitor storage portion 16, a capacitor placement portion 20, and a lead holding portion 24, and is made of an insulating synthetic resin material.

  The capacitor storage unit 16 includes a pair of cylindrical holes 18 that store the tip side including the explosion-proof valve portions 12a of the two electrolytic capacitors 12 side by side.

  The capacitor mounting portion 20 is integrally provided in the axial direction of the pair of cylindrical holes 18 in the capacitor storage portion 18, and the semi-cylindrical portions 22 opened upward are arranged side by side.

  As shown in FIG. 6, projections 28 are formed at three locations in the circumferential direction on the end surface of the cylindrical hole 18 provided in the capacitor housing 16, and as shown in FIG. 5, the electrolytic capacitor 12. When the capacitor is inserted into the cylindrical hole 18, the tip of the capacitor hits and positions the protrusion 28, thereby forming a gap 34 between the explosion-proof valve portion 12 a at the tip of the electrolytic capacitor 12 and the end surface of the cylindrical hole. The clearance 34 has a dimension that allows the explosion-proof valve portion 12a of the electrolytic capacitor 12 to operate. In addition, it is good to form the protrusion part 28 avoiding the area | region where the groove part used as the explosion-proof valve part 12a swells, ie, a concave groove part.

  As shown in FIGS. 6 and 7, a discharge path 32 is formed by forming grooves in the axial direction of both surfaces of the partition wall 30 on the upper portion of the partition wall 30 that partitions the pair of cylindrical holes 18 provided in the capacitor housing portion 16. The gap 34 formed by the protrusion 28 communicates with the outside via the discharge path 32.

  As shown in FIGS. 1 and 2, the lead holding portion 24 is formed integrally with the end portion of the capacitor mounting portion 20, and holds the lead terminals 12 b of the two sets of electrolytic capacitors 12 in a state bent to the substrate 14 side. After being held through the groove 24a, it is inserted into the lead insertion hole 14a of the substrate 14 and soldered.

  The holding groove 24 is formed with a through hole at the back of the slit groove. The width of the slit groove is made smaller than the diameter of the lead terminal 12b, and when the lead terminal 12b is passed, the slit groove is expanded and the lead terminal is inserted into the through hole. By inserting 12b, the lead terminal 12b is sandwiched and held.

  As shown in FIG. 3, the base 25 is integrally formed on the back surface side of the capacitor assembly module 10 in two locations corresponding to the capacitor placement positions, and the leg portions 16 c on both sides of the lower portion of the capacitor storage portion 16 are further formed. The connection pin 26 protrudes from the substrate mounting surface and can be inserted into the pin insertion hole 14b of the substrate 14 and fixed by soldering. The connection pin 26 has a pin member resin-fixed to the leg portion 16c by press-fitting or insert molding.

  Next, the operation when the electrolytic capacitor substrate assembly and the electrolytic capacitor explosion-proof valve portion of the electrolytic capacitor are operated by the capacitor built-in module of the present embodiment will be described.

  The capacitor built-in module 10 includes a capacitor housing portion 16 and a capacitor corresponding to the inner diameter of the cylindrical hole 18 provided in the capacitor housing portion 16 corresponding to the outer diameter of the electrolytic capacitor 12 disposed on the substrate 14 and the length of the electrolytic capacitor 12. The thing of the length of the axial direction which match | combined the mounting part 20 is prepared.

  In the assembling work, the tip of the electrolytic capacitor 12 having the explosion-proof valve portion 12a is inserted into the cylindrical hole 18 provided in the capacitor housing portion 16 of the capacitor built-in module 10. The tip of the electrolytic capacitor 12 that has entered the cylindrical hole 18 hits the protrusion 28 formed at the end of the cylindrical hole, and a gap 34 is formed between the tip of the capacitor and the end surface of the cylindrical hole.

  When the electrolytic capacitor 12 is inserted into the cylindrical hole 18, the partition wall 30 that partitions the cylindrical holes 18 forms a discharge path 32 by grooves on both sides of the upper portion thereof. A discharge path 32 is secured between the side surface and a gap 34 formed by inserting the electrolytic capacitor 12 at the tip of the cylindrical hole 18 is communicated with the opening side of the cylindrical hole 18 through the discharge path 32.

  In addition, the electrolytic capacitor 12 inserted into the cylindrical hole 18 of the capacitor built-in module 10 has a body portion that rides on the capacitor mounting portion 20, and the lead terminal 12b provided on the rear end surface is bent toward the substrate 14 side to hold the lead. The holding groove 24a of the portion 24 is pushed and expanded to be held in a sandwiched state, and the electrolytic capacitor 12 is aligned and integrated in the capacitor built-in module 10.

With the two electrolytic capacitors 12 mounted and integrated in the capacitor built-in module 10 as described above, the lead terminal 12b is inserted into the lead insertion hole 14a of the substrate 14, and the connection pins 26 of the capacitor built-in module 10 are connected. Is inserted into the pin insertion hole 14b of the substrate 14,
In this state, solder connection is performed in the soldering process. In this case, the vibration resistance of the capacitor built-in module 10 in which the electrolytic capacitor 12 is arranged can be improved by soldering the connection pins 26 of the capacitor built-in module 10 to the substrate 14. Since the lead terminal 12b is held by the lead holding portion 24, alignment with the lead insertion hole 14a of the substrate 14 is easy.

  Further, if the internal temperature of the electrolytic capacitor 12 rises to a high pressure for some reason during the operation of the apparatus mounted with the capacitor built-in module 10, and the explosion-proof valve 12a of the electrolytic capacitor 12 is activated, the explosion-proof valve portion 12a starts the cylinder. A high-pressure gas containing water vapor is ejected into the gap 34 between the holes 18.

  The high-pressure gas ejected from the explosion-proof valve portion 12 a into the gap 34 is discharged to the outside through the axial discharge path 32 formed in the partition wall 30 of the cylindrical hole 18. For this reason, even if a high-pressure gas is ejected by the operation of the explosion-proof valve portion 12a, the internal pressure of the gap 34 does not increase, and the internal pressure increases by the operation of the explosion-proof valve portion 12a like a gap having no conventional discharge path. The module is not damaged and scattered, and high safety is obtained.

  Further, the electrolyte may leak from the electrolytic capacitor 12 into the gap 34 due to the operation of the explosion-proof valve portion 12a. However, since the discharge path 32 is provided at the upper part of the gap 34, the electrolyte is not filled until the gap 34 is full. Since it flows into the discharge path 32, it takes time for the electrolyte to leak to the outside, and the amount leaked to the outside is reduced by the amount accumulated in the discharge path 32, and the amount of leak of the electrolyte can be reduced. It becomes.

[Modification of the present invention]
In the above embodiment, a capacitor built-in module in which two electrolytic capacitors are arranged side by side is taken as an example, but a capacitor built-in module in which three or more electrolytic capacitors are arranged side by side can also be used. good.

The present invention includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Capacitor built-in module 12: Electrolytic capacitor 12a: Explosion-proof valve portion 12b: Lead terminal 12a: Explosion-proof valve portion 14: Board 14a: Lead insertion hole 14b: Pin insertion hole 16: Capacitor storage portion 16a: Leg portion 18: Cylindrical hole 20: Capacitor mounting portion 22: Semi-cylindrical portion 24: Lead holding portion 25: Base 26: Connection pin 28: Protruding portion 30: Partition 32: Discharge path 34: Clearance

Claims (4)

In an insulating capacitor built-in module in which a plurality of electrolytic capacitors provided with an explosion-proof valve at the front end and a lead terminal at the rear end are arranged on the board in a state of being placed side by side,
A capacitor storage portion provided side by side with a plurality of cylindrical holes for storing the tip side including the explosion-proof valve portions of the plurality of electrolytic capacitors;
A capacitor mounting portion that is integrally provided in the axial direction of the plurality of cylindrical holes and that is arranged side by side with a semi-cylindrical portion that opens upward, an explosion-proof valve portion and a cylinder at the tip of the electrolytic capacitor housed in the cylindrical hole A protrusion that forms a gap with the hole end surface;
A discharge path that is formed in the axial direction of the partition wall that partitions the plurality of cylindrical holes, and that communicates the gap formed by the protrusions to the outside;
A capacitor built-in module characterized by comprising:
The capacitor built-in module according to claim 1, wherein the discharge path is formed on an upper part of a partition wall partitioning a cylindrical hole accommodating a plurality of electrolytic capacitors.
2. The capacitor built-in module according to claim 1, further comprising a lead holding portion that is integrally formed at an end portion of the capacitor mounting portion and holds the lead terminals of the plurality of electrolytic capacitors bent in the substrate side. Capacitor built-in module characterized by that.
  2. The capacitor built-in module according to claim 1, further comprising a connection pin that protrudes from the board mounting surface of the capacitor housing portion and is fixed to the board by soldering.

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