JPH0116372Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a cooling mechanism for electronic equipment in a soundproof engine-driven welding machine, and in particular to a rectifier and controller that converts the AC output of a welding generator into DC output. The present invention relates to a cooling mechanism for electronic equipment of a soundproof engine-driven welding machine that aims to increase the cooling effect of electronic equipment such as elements.

"Prior Art" Generally, soundproof engine-driven welding machines for outdoor work are portable, so that they can be conveniently transported on-site.
In addition, a small and lightweight device is required. Moreover,
Soundproof engine-driven welding machines are used for outdoor work, so in consideration of the local environment and work environment, the case is made of a metal plate with sound-absorbing material attached to the inner surface, and the engine and welding machine are It surrounds the entire generator and other control equipment. In addition, in recent years, welding work is often performed at construction sites, and there is a demand for one welding machine that can perform multiple welding operations at the same time.
In order to meet the above requirements, a so-called high-frequency brushless generator is used as a welding generator due to its ease of maintenance and inspection, and its small size and light weight. From the viewpoint of noise and arc characteristics, the generator converts high frequency output into DC output using a rectifier or control element and uses it as a welding power source.
Therefore, the rectifier and control element used are for large currents so as to be able to sufficiently withstand a large value of welding output, and must be cooled because they generate a large amount of heat. Conventionally, when cooling electronic equipment such as rectifiers and control elements, the following method has been adopted.

A rectifier or the like is built into the head cover of the welding generator, and the rectifier or the like is forcibly cooled using a cooling fan built into the welding generator.

A control box is installed in a soundproof case, and a rectifier, etc. is installed in the control box, and a cooling fin with an electric fan is attached to the rectifier, etc., and the rectifier, etc. is forcibly cooled by the cooling fin with an electric fan.

``Problems to be solved by the invention'' However, in conventional soundproof engine-driven welding machines, electronic devices such as rectifiers and control elements are surrounded by a soundproof housing as well as the generator head cover or control box. Not only is it double-covered, making it difficult for cooling air to flow in and out, but the electronic equipment is also exposed to radiant heat generated by the generator and engine, and the air inside the soundproof enclosure has increased in temperature. Both of the above cooling methods have problems such as poor cooling efficiency and, as a result, rapid damage to electronic equipment such as rectifiers.

Therefore, in view of the above-mentioned circumstances, the present invention was developed to utilize the cooling air when introducing cooling air to cool the engine, welding generator, etc. into the soundproof housing to cool the electronic equipment. An object of the present invention is to provide a cooling mechanism for electronic equipment of a soundproof engine-driven welding machine that can improve cooling efficiency by cooling and also prevent internal noise from leaking from the cooling air intake flow path. .

``Means for Solving the Problems'' In order to achieve the above object, the present invention provides a welding generator that is connected directly to an engine in a straight line to the engine using a casing in which a sound absorbing material is pasted on the inside of a metal plate. The interior of the housing is divided into three rooms, a generator room, an engine room, and an exhaust room, using a partition plate, and the welding process is carried out from the intake port in the housing through the generator room using a cooling fan built into the welding generator. The discharge port of the welding generator is opened into the engine compartment so that the cooling air introduced into the welding generator can be released into the engine compartment, and the cooling air is inserted into the opening of the partition plate that partitions the engine compartment and the exhaust compartment. A soundproof engine-driven welding machine is equipped with a radiator equipped with a cooling fan that also serves as forced exhaust, and the housing is equipped with an exhaust port for discharging hot air from the exhaust chamber and freely rotating running wheels. The center of the bottom plate of the chamber is curved into a concave shape into which the lower part of the welding generator fits, and the above-mentioned intake port is opened in the rising wall of the concave part of the center of the bottom plate, and the horizontal part of both sides of the bottom plate is bent. Attach electronic equipment to the shaped flange,
Cooling fins included in the electronic device are disposed so as to protrude downwardly from the flanges on both sides of the bottom plate and cover the intake port with an appropriate gap, and the area around the cooling fins is A soundproof engine-driven welding machine that is surrounded by a peripheral wall whose lower surface is open in cooperation with the bottom plate around the mouth, and has an inlet for outside air to flow in at a position facing the running wheels of the peripheral wall with a narrow gap. It features a cooling mechanism for electronic equipment.

Embodiment An embodiment of the cooling mechanism for electronic equipment of a soundproof engine-driven welding machine according to the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, 1 is an engine welding machine main body, and this engine welding machine main body 1 consists of an engine 2 and a welding generator 3 that is directly connected to the engine 2 and rotationally driven. The engine welding machine main body 1 is surrounded by a casing 4 serving as a soundproofing device. This housing 4 is formed from a metal plate 6 to which a sound absorbing material 5 is adhered inside in order to enhance the soundproofing effect. The housing 4 includes:
Bottom plate 7, front/rear plates 8, 9, side plates 10, top plate 1
1 are integrally attached to each other. Inside the casing 4, partition plates 12 and 13 extending vertically in front of the engine 2 and approximately at the center of the welding generator 3 form an exhaust chamber 14 in front of the partition plate 12 and an exhaust chamber 14 in front of the partition plate 12. , 13 between the engine compartment 15 and the partition plate 13
It is divided into a generator room 16 on the rear side. The partition plate 12 has an opening, and a radiator 17 for cooling the engine is mounted in the opening. On the other hand, the exhaust chamber 14 is equipped with a muffler 18 for muffling noise. An air purifier 19 is provided above the engine 2, and a radiator cooling fan 20 is provided in the front of the engine 2.

The side plate 10 of the housing 4 is equipped with a door 24 through which inspection and maintenance of the engine 2 or air intake into the engine compartment 15 can be performed. This door 24 is
As shown in FIG. 2, it is formed so that it can be opened and closed in the vertical direction by engaging and disengaging a locking rod 25. The radiator cooling fan 20 is rotated by the engine 2 and supplies cooling air to the radiator 17. At this time, arrow F shown in FIG.
Air blown from a cooling fan 27 built into the welding generator 3 such as G, J, and K and the door 24
When the opening is open, air flowing in from the opening flows along the outer periphery of the engine 2 and cools the engine 2.

The air that has cooled the radiator 17 is then transferred to the exhaust chamber 1 as indicated by arrows H and I shown in FIG.
After that, the air is blown to the outside air from the exhaust ports 21 and 22 provided on the upper surface and the lower end of the housing 4, thereby cooling the muffler 18 installed in the exhaust chamber 14. It is becoming more and more common.

The welding generator 3 has an air intake port 26 opening toward the generator chamber 16 side, and is equipped with a cooling fan 27 located toward the engine chamber 15 side. Therefore, when the welding generator 3 rotates together with the driving of the engine 2, the cooling fan 27 rotates, thereby generating electricity from the outside as shown by the arrow E shown in FIG. 1 and the arrow P shown in FIG. The air introduced into the machine room 16 flows into the welding generator 3 from an air intake port 26 for cooling purposes. Then, the air that has cooled the inside of the welding generator 3 is transferred to the discharge port 3 by the cooling fan 27 as shown by the arrow Q shown in FIG.
Air is blown to the engine compartment 15 from a.

Engine compartment 15 and generator compartment 16 of the housing 4
The bottom plate 7 has both sides bent into an inverted L shape and a concave portion 30 formed in the center. Said engine 2
are placed on the flanges 31 on both sides of the bottom plate 7 so as to straddle the concave portion 30, and are connected to the engine 2 and the bottom plate 7.
A vibration isolating rubber 32 is interposed between the two. Further, the welding generator 3 is attached to a support frame 34 provided in the concave portion 30 via a vibration-proofing rubber 33, so that vibrations generated when the engine welding machine main body 1 is driven are sound-proofed. It is configured such that the signal is not transmitted to the housing 4 of the device. The bottom plate 7 is equipped with a welding generator 3.
An intake port 36 is bored in the rising wall 35 near the air intake port 26, and an intake portion 37 is provided outside the intake port 36 at the rear end of the flange 31 and in a portion surrounded by the casing 4. It is provided. This intake section 37 has an open bottom surface, and is configured to allow air to directly flow in from the outside as shown by arrow A shown in FIG. 1 and arrow L shown in FIG. 3. The intake section 3
A side duct 38 whose lower surface is open is provided between the rising wall 35 of the bottom plate 7 and the side plate 10 on the front side of the bottom plate 7 . Air flowing into the side duct 38 from the lower opening surface serving as an intake port is provided through a hole in the rear surface of the side duct 38, as shown by arrow D shown in FIG. 1 and arrow M shown in FIG. 3. inlet 40
The air is configured to flow more into the air intake section 37. Front and rear wheels 41 and 42 are provided at the front and rear ends of the side ducts 38 and 38, respectively. Of these, the rear wheel 42 is disposed so as to cover the inlet 40 with an appropriate gap.

Electrical parts 60 are provided at the rear ends of the flanges 31 on both the left and right sides of the bottom plate 7, respectively. That is, electronic equipment such as a rectifier 50 consisting of a control element such as a thyristor and other elements for converting the output of the welding generator 3 from alternating current to direct current is mounted on the intake section 37, and this rectifier 50 etc. Electrical components such as a transformer 51 are arranged in parallel on the front side. An L-shaped cover member 52 attached to the rising wall 35 of the bottom plate 7 is provided around the rectifier 50, the transformer 51, etc., and is located near the welding generator 3 in the generator room 16. The space is narrowed so that air entering from the intake port 36 is smoothly guided to the air intake port 26 of the welding generator 3. The rectifier 5
The electronic device such as No. 0 has cooling fins 53 protruding downward to prevent heating. The cooling fins 53 are exposed toward the intake section 37 on the lower side of the flange 31, and are exposed to the outside air entering the intake section 37 from the lower opening surface of the intake section 37 and the inflow port 40 of the side duct 38. The sink cooling fins 53 are cooled. The outside air that has cooled the cooling fins 53 enters the generator room 16 through the intake port 36 and cools the welding generator 3, engine 2, etc. as described above. Here, the cooling fins 53 are arranged so as to cover the intake port 36 with an appropriate gap, so that the noise during operation of the engine welding machine that tends to leak to the outside through the intake flow path is sound-insulated. It is designed to be done. The rectifier 50, transformer 51, etc. are provided in sets on both the left and right sides so that two workers can weld separately and at the same time. Further, as shown in FIG. 2, the electrical equipment section 60 can be easily maintained and inspected by removing the removable panel 54 provided on the rear panel 9 of the housing 4 or the panel provided on the side panel 10. It is also structured like this.

The engine-driven welding machine configured as described above is operated with the door 24 closed when it is desired to suppress the generation of noise as much as possible, such as when working in a city area.
In this case, outside air that has entered the intake section 37 directly from the lower opening surface of the intake section 37 or from the lower opening surface of the side duct 38 flows into the generator room 16 .
At this time, the cooling fins 53 exposed to the intake section 37
cooling is performed. The air that has entered the generator room 16 is taken into the welding generator 3 through the air intake port 26 to cool the inside of the welding generator 3,
Next, the cooling fan 27 sends it out from the discharge port 3a of the welding generator 3 to the engine room 15 to cool the engine 2, and then it passes through the radiator cooling fan 20 to the exhaust chamber 14 and is discharged to the outside. At this time, due to the sound insulation by the cooling fins 53, the maze of the intake flow path from the inlet 40 to the intake port 36, and the fact that the intake portion 37 is open toward the ground, most of the noise is generated from the intake flow path. Does not leak outside.
Separately, if the noise caused to the surrounding area is not such a problem, such as when used outside the
is opened to allow a large amount of outside air to flow into the engine compartment 15, thereby effectively cooling the engine 2. however,
The generator room 16 is partitioned by the partition plate 13, and the cooling fan 27 built into the welding generator 3 independently takes in air, so the cooling effect of the cooling fin 53 remains unchanged. It is.

"Effects of the invention" As described above, according to the invention, when cooling air is introduced into the housing from the intake port, it can be passed through the cooling fins to effectively cool the electronic equipment, thus increasing the cooling efficiency. If the cooling fins can be used together with the wheels for running to form a labyrinth against internal noise and insulate internal noise from leaking from the intake port, It can also be used for both functions.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a soundproof engine-driven welding machine according to the present invention, Fig. 2 is a rear view of Fig. 1, and Fig. 3 shows the intake flow path seen from below in Fig. 1. 4 is a cross-sectional view of the main part passing over the electronic device in FIG. 1, and FIG. 5 is a cross-sectional view taken along A-A in FIG. 4.
FIG. 1... Engine welding machine body, 4... Housing, 5...
...Sound absorbing material, 6...Metal plate forming the housing, 7...
Bottom plate, 7... Intake section, 50... Rectifier, 53...
Cooling fin, 60...Electrical equipment section.

Claims (1)

[Scope of utility model registration request] A housing made of a metal plate with sound-absorbing material pasted inside surrounds the engine and a welding generator that is directly connected to the engine in a straight line. Inside the housing, a generator room, an engine room, and an exhaust are separated by partition plates. The welding generator is divided into three rooms, and the cooling air introduced into the welding generator by the cooling fan built into the welding generator can be discharged from the intake port in the housing through the generator room into the engine room. Open the discharge port of the machine into the engine room,
In addition, a radiator with a cooling fan that also serves for forced exhaust of cooling air is attached to the opening of the partition plate that separates the engine room and the exhaust chamber, and the casing has an exhaust port that discharges hot air from the exhaust chamber, and a free-rotating radiator. In a soundproof engine-driven welding machine, the center part of the bottom plate of the generator chamber is bent into a concave shape into which the lower part of the welding generator fits, and the bottom plate has a concave part in the center part. Open the above intake port on the rising wall of
In addition, an electronic device is mounted on the horizontal flanges on both sides of the bottom plate, and cooling fins included in the electronic device are made to penetrate and protrude downward from the flanges on both sides of the bottom plate, leaving an appropriate gap with respect to the air intake port. At the same time, the cooling fins are surrounded by a peripheral wall whose lower surface is open in cooperation with the bottom plate around the intake port, and outside air is injected into the peripheral wall at a position facing the running wheels with a narrow gap. A cooling mechanism for electronic equipment of a soundproof engine-driven welding machine, characterized in that an inlet is opened for the inflow of.