JP5641645B2 - Welding power source - Google Patents

Description

  The present invention relates to a welding power source provided with a cooling fan.

  A general circuit configuration of the welding power source will be described with reference to FIG. In the figure, the power supplied from the commercial power source 1 that is a three-phase AC power source is rectified by the primary side rectifier 2, and the rectified DC power is smoothed by the smoothing capacitor 4. The electric power smoothed by the inverter circuit 5 made of a semiconductor element is converted into high-frequency electric power. The control circuit 6 detects the welding current with the current detector 10 and controls the inverter circuit 5 so that the output current value becomes a predetermined current set value. The high frequency power is stepped up or stepped down by the transformer 7 and rectified by the secondary side rectifier 8. The rectified high-frequency component of the DC power is cut and smoothed by the secondary side reactor 9, and power is supplied between the welding torch (not shown) connected to the output terminal 11 and the workpiece.

  In a conventional welding power source, a fan for cooling a heat generating component such as an electronic component or a transformer provided inside is usually provided at a position close to the ground on the rear surface of the welding power source. An opening of the same size is opened. Since the welding power source is placed in an environment where iron powder accumulates on the ground of a factory or the like, or the iron powder floats in the air, it is easy to suck the iron powder from the opening for the fan. In addition, when using a welding power source outdoors, it is easy for rain to enter from the opening for the fan. As a result, there has been a problem that iron powder and moisture sucked by the fan have a problem with the electrical components.

  On the other hand, a welding power source in which a fan is provided on the upper surface has been proposed in order to improve the ability to suck in iron powder and moisture. (For example, refer to Patent Document 1). This welding power source is installed at a place away from the ground, so it is difficult to suck in iron powder and moisture from the outside. The electric parts such as heat sinks and transformers are stacked in the vertical direction, and there is little tolerance for the arrangement of the electric parts. Further, since iron powder tends to accumulate on the heat sink, it is necessary to periodically remove the iron powder by blowing air with the air blow gun directed at the heat sink. At this time, since the components are arranged above and below the heat sink, it is difficult to clean the heat sink.

JP 2007-105741 A

  As described above, the conventional welding power source sucks iron powder and moisture from the opening for the fan when the fan is provided at a position close to the ground on the rear surface of the welding power source, causing a problem in the electrical component. There was a problem. On the other hand, when the fan is provided on the upper surface in the welding power source, it has a structure in which components such as a heat sink and a transformer are stacked in the vertical direction. Moreover, it was difficult to clean the heat sink.

  An object of the present invention is to provide a welding power source that can reduce problems with electrical components due to iron powder or moisture sucked by a fan and can easily clean a heat sink to which electrical components are attached.

In order to solve the above-described problems, the invention of claim 1
An air passage disposed at the rear part of the housing and extending in the longitudinal direction in the direction of both end surfaces of the housing;
A first fan that is provided at a longitudinal intermediate portion of the rear surface of the air passage and sends wind;
A heat sink provided on a front surface of the air passage, having a plurality of fins formed on the first fan side, a first electric component disposed on the back surface, and a wind from the first fan being applied in a right angle direction; ,
A second electrical component that is attached to an upper partition plate provided in the casing on the front surface side of the casing with respect to the air path and cools the second electrical component provided in the internal space of the casing. With fans,
A vent hole that is an outlet of the wind sent from the second fan is formed on the bottom surface of the casing,
The air path is formed by being surrounded by a rear surface of the casing, both end surfaces, the bottom surface, the upper partition plate, and a vertical wall provided at a position facing the rear surface. ,
The heat sink is provided on the vertical wall, and the first electrical component is disposed on the back surface of the heat sink through an opening formed in the vertical wall;
The internal space is formed by being surrounded by the front surface of the housing, the both end surfaces, the bottom surface, the vertical wall, and the upper partition plate,
The first electrical component and the second electrical component are provided in the internal space;
The welding power source, wherein the first electric component is an electronic component and the second electric component is a reactor or a transformer .

  The welding power source according to the present invention eliminates defects in the first electric component and the second electric component due to the iron powder and moisture sucked by the first fan, and the iron powder and moisture sucked by the second fan. The amount of the heat sink can be reduced and the heat sink to which the first electrical component is attached can be easily cleaned.

It is a figure which shows the structure inside the welding power supply of this invention. It is a figure which shows the general circuit structure of a welding power supply.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 is a diagram showing an internal configuration of a welding power source according to the present invention. FIG. 1 (A) is a view of the welding power source as viewed from the side, and FIG. In the figure, a casing 20 of the welding power source 19 is composed of a front surface 20a, a rear surface 20b, both end surfaces 20c and 20d, an upper surface 20e, and a bottom surface 20f, and each is attached to a frame. A first fan 21 is provided on the rear surface 20 b, and a vertical wall 22 facing the rear surface 20 b is disposed perpendicular to the bottom surface 20 f at the rear portion inside the welding power source 19. The base 23a of the metal heat sink 23 is fixed to the first fan 21 side (Y2 direction) of the vertical wall 22, and a plurality of the heat sink base 23a on the first fan 21 side (Y2 direction) are fixed. The fins 23b are formed, and the heat dissipation effect is enhanced by increasing the surface area. The short direction of the fins 23b is the direction toward the first fan 21 (Y2 direction), and the long direction (X1-X2 direction) of the fins 23b is the direction of both end surfaces 20c-20d of the housing 20. These fins 23b are arranged in the vertical direction (Z1-Z2 direction), and are sent so that the wind from the first fan 21 strikes the heat sink 23 at a right angle.

An upper partition plate 24 is provided in the upper part inside the housing 20. Surrounded by a part of the rear surface 20b of the housing, a part of both end surfaces 20c and 20d, a heat sink 20C, a vertical wall 22, a part of the upper partition plate 24, and a part of the bottom surface 20f, a rectangular cross section A shaped air passage 25 is formed. Ventilation holes (not shown) through which the air sent from the first fan 21 blows are formed on both end surfaces 20c and 20d of the housing where both ends of the air passage 25 are located. The path 25 extends in the longitudinal direction in the rear end portion 20c-20d direction (X1-X2 direction) at the rear portion of the housing 20. The first fan 21 is disposed almost in the middle of the air passage 25. Both end surfaces 20c and 20d are detachable from the housing 20. The vertical wall 22 is formed with an opening smaller than the back surface (Y1 direction) of the heat sink 23. The first electric component 26, which is a primary rectifier, a transistor, and a secondary rectifier, passes through the opening. Are directly attached to the back surface of the heat sink 23 by screws or the like. As a result, the heat of the first electrical component 26 is quickly transmitted to the heat sink 23. The opening is closed by the back surface of the base 23a of the heat sink. The smoothing capacitor 4 is disposed on the upper partition plate 24.

A second fan 27 is attached to the upper partition plate 24 of the housing 20 on the front surface 20a side (Y1 direction) of the air passage 25 in the housing 20. Air intake holes 28 are formed in the upper portions of both end faces 20c and 20d of the housing to be sucked from the outside by the second fan 27. The intake hole 28 is composed of a plurality of small armor windows and is arranged at a high position from the ground. A plurality of ventilation holes 29 through which the wind sent from the second fan 27 blows out are formed on the bottom surface 20f of the housing. A second electric component 30, which is a transformer and a secondary reactor, is attached to the bottom surface 20 f of the casing, and the second electric component 30 is cooled by the second fan 27. A plurality of wheels 31 are pivotally supported on the lower surface of the bottom surface 20 f via brackets, and the welding power source 19 can be moved by these wheels 31. A control circuit 6 is disposed at the top of the housing. The front surface 20a, the rear surface 20b, the both end surfaces 20c and 20d, the bottom surface 20f, the vertical wall 22 and the upper partition plate 24 of the housing are made of metal, for example.

  A filter may be attached to the intake air 28 into which outside air is sucked by the second fan 27 to enhance the dustproof effect. In addition, a shutter may be attached to the intake hole 28 so that the shutter is closed to prevent iron powder or moisture from entering when the welding power source is not used, and the shutter may be opened when the welding power source is used.

  The operation will be described below. The welding power source 19 of the present invention is used in an environment where iron powder accumulates on the ground of a factory or the like or iron powder floats in the air. While the welding power source 19 is operating, the first electrical component 26 and the second electrical component 30 generate heat and the temperature rises. The heat of the first electrical component 26 is transmitted to the air in the internal space 33 and also directly to the heat sink 23. At this time, since the heat sink 23 is made of metal, the heat conductivity is higher than that of air, and the heat of the first electrical component 26 is efficiently transmitted to the heat sink 23. The heat transmitted to the heat sink 23 is efficiently radiated into the air in the air passage 25 by the plurality of fins 23b. The heat transmitted to the heat sink 23 is also transmitted to the vertical wall 22 and both end surfaces 20c and 20d and the bottom surface 20f of the housing, and this heat is radiated to the internal space 33 and the outside air. On the other hand, in the second electrical component 30, the coil portion generates heat, and this heat is transmitted to the air in the internal space 33.

  When the first fan 21 is operated, the outside air around the opening formed in the rear surface 20 b of the housing is taken into the air passage 25 by the first fan 21, and the air flows to the heat sink 23. Directly hits the right angle direction and flows in two directions along the fins 23b in the longitudinal direction (X1-X2 direction). And this wind blows off from the ventilation hole of the both ends of the air path 25 to the exterior. In the air passage 25, the distance from the first fan 21 to the ventilation holes at both ends of the air passage 25 is about half of the entire length of the air passage 25, so that the wind is quickly discharged to the outside. At this time, heat is taken away from the surface of the fin 23b, so that the heat sink 23 is efficiently cooled, and the first electrical component 26 is also efficiently cooled via the heat sink 23.

  The air passage 25 is surrounded by a part of the rear surface 20b of the housing, a part of both end surfaces 20c and 20d, a part of the bottom surface 20f, the vertical wall 22 and a part of the upper partition plate 24. The air sent to the heat sink 23 is not sent into the internal space 33 in which the first electric component 26 is attached, and does not directly hit the first electric component 26 and the second electric component 30. Therefore, even if air containing iron powder or moisture is sent from the first fan 21, the first electric component 26 and the second electric component 30 do not cause a problem. Therefore, the first fan 21 that cools the heat sink 23 does not need to be dust-proofed or drip-proofed, and has an opening of approximately the same size as the first fan 21 on the rear surface 20b of the housing. The first fan 21 can be disposed at a position close to the ground. The heat transmitted to the heat sink 23 is also transmitted to the vertical wall 22, both end surfaces 20 c and 20 d and the bottom surface 20 f of the housing, so that the heat is radiated to the internal space 33 and the outside air.

  Next, when the second fan 27 is operated, the external air around the intake holes 28 formed in the upper portions of both end faces 20c and 20d of the housing is taken into the internal space 33 by the second fan 27. The wind directly hits the second electrical component 30, and this wind is blown out from the ventilation hole 29 formed in the bottom surface 20f. At this time, since the wind directly hits the coil portion of the second electrical component 30, heat is efficiently removed from the coil portion.

  Since the air suction port of the second fan 27 is the air intake holes 28 formed of a plurality of small armor windows opened on the upper ends 20c and 20d of the housing, the air intake holes 28 are separated from the ground. In addition, since the air intake hole 28 is composed of many small armor windows, the wind pressure at the air intake hole 28 is reduced, so that clean air with less iron powder and moisture can be taken into the internal space 33. it can. Therefore, iron powder and moisture do not adhere to the terminals of the second electrical component 30. Further, since the direction of the wind from the second fan 27 is from the top to the bottom, even if iron powder or moisture enters the internal space 33, it can be easily made from the plurality of ventilation holes 29 formed in the bottom surface 20f. It is discharged outside.

  When the first fan 21 of the welding power source 19 is operated, the iron powder enters together with the air. Therefore, after being used for a relatively long time, the iron powder enters and accumulates in the gaps between the fins 23b of the heat sink. In this state, since the heat dissipation effect of the heat sink 23 is reduced, it is necessary to periodically clean the heat sink 23 using an air blow gun. In this operation, the both end portions of the heat sink 23 are exposed only by removing the screws that attach the both end surfaces 20c, 20d of the housing to the frame and opening the both end surfaces 20c, 20d. Then, compressed air is injected from one outlet of the air passage 25 with the air outlet of the air blow gun directed toward the inside of the air passage 25. This compressed air becomes a jet along the longitudinal direction (X1 or X2 direction) of the air passage 25, and blows off the iron powder deposited on the fins 23b toward the other outlet. Thus, the heat sink 23 can be easily cleaned.

Moreover, the injection direction of the compressed air injected from the air blow gun is a direction along the longitudinal direction (X1 or X2 direction) of the air passage 25 and intersects the blowing direction (Y1 direction) of the first fan 21. Direction. For this reason, the compressed air from the air bougan becomes a jet that hardly causes the wind pressure to act directly on the blades of the first fan 21. Therefore, at the time of dust removal work using an air blow gun, the first fan 21 is not reversed at a high speed by a strong jet of compressed air, and there is no possibility that the blades and the rotary bearing of the first fan 21 are damaged. .

  As a result, the welding power source according to the present invention eliminates the problems of the first electric component 26 and the second electric component 30 caused by the iron powder and moisture sucked by the first fan 21, and the second fan 27 The amount of iron powder and moisture sucked in can be reduced, and the heat sink 23 to which the first electrical component 26 is attached can be easily cleaned.

  Further, the welding power source 19 of the present invention does not partition the first electrical component 26 and the second electrical component 30 attached to the heat sink 23 with a partition member as in the conventional welding power source. That is, the first electrical component 26 and the second electrical component 30 are disposed in the same internal space 33. Therefore, since the distance between the first electrical component 26 and the second electrical component 30 can be arranged short, the length of the power cable connecting them can be shortened, and the loss of the cable is reduced. This improves the efficiency of the welding power source. In addition, since the length of the power cable is shortened, the cost is reduced.

The above-described air path 25 includes a part of the rear surface 20b of the casing, a part of both end surfaces 20c and 20d, a part of the bottom surface 20f, and a part of the vertical wall 22 and the upper partition plate 24. The heat sink 23 is surrounded and provided on the first fan 21 side (Y2 direction) of the vertical wall 22, and an opening is formed in the vertical wall 22, and the first electrical component 26 passes through the opening to the heat sink 23. Had been placed on the back. Instead of this, the vertical wall 22 may be omitted by forming the heat sink 23 so as to extend to the upper partition plate 24 of the casing and both end faces 20c and 20d of the casing. As a result, the air path is formed by being surrounded by the rear surface 20b of the housing, a part of both end surfaces 20c and 20d and a part of the bottom surface 20f, and a part of the heat sink 23 and the upper partition plate 24. In this case, since the heat sink 23 can be directly attached to the upper partition plate 24 of the housing, the heat dissipation effect can be further enhanced. A dustproof material such as sponge rubber may be attached around the heat sink 23.

In addition, when there is a space between the periphery of the heat sink 23 and the upper partition plate 24 or both end surfaces 20c and 20d of the housing, a partition plate that blocks only these spaces instead of providing the vertical wall 22 described above. May be provided around the periphery of the heat sink 23.

DESCRIPTION OF SYMBOLS 1 Commercial power source 2 Primary side rectifier 4 Smoothing capacitor 5 Inverter circuit 6 Control circuit 7 Transformer 8 Secondary side rectifier 9 Secondary side reactor 10 Current detector 11 Output terminal 19 Welding power source 20 Housing 20a Front surface 20b Rear surface 20c, 20d Both end surfaces 20e Top surface 20f Bottom surface 21 First fan 22 Vertical wall 23 Heat sink 23a Base 23b Fin 24 Upper partition plate 25 Air passage 26 First electric component 27 Second fan 28 Intake hole 29 Ventilation hole 30 First Two electrical components 31 Wheel 33 Internal space

Claims (1)

A housing,
An air passage disposed at the rear part of the housing and extending in the longitudinal direction in the direction of both end surfaces of the housing;
A first fan that is provided at a longitudinal intermediate portion of the rear surface of the air passage and sends wind;
A heat sink provided on a front surface of the air passage, having a plurality of fins formed on the first fan side, a first electric component disposed on the back surface, and a wind from the first fan being applied in a right angle direction; ,
A second electrical component that is attached to an upper partition plate provided in the casing on the front surface side of the casing with respect to the air path and cools the second electrical component provided in the internal space of the casing. With fans,
A vent hole that is an outlet of the wind sent from the second fan is formed on the bottom surface of the casing,
The air path is formed by being surrounded by a rear surface of the casing, both end surfaces, the bottom surface, the upper partition plate, and a vertical wall provided at a position facing the rear surface. ,
The heat sink is provided on the vertical wall, and the first electrical component is disposed on the back surface of the heat sink through an opening formed in the vertical wall;
The internal space is formed by being surrounded by the front surface of the housing, the both end surfaces, the bottom surface, the vertical wall, and the upper partition plate,
The first electrical component and the second electrical component are provided in the internal space;
The welding power source, wherein the first electric component is an electronic component and the second electric component is a reactor or a transformer .

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