JP2008118854A - Power supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply unit which prevents rain water from coming into contact with a power circuit part. <P>SOLUTION: In a case 2, storing a power circuit in the inside, front and rear parts 4, 6 are opposed with a space and respectively arranged and formed, an intermediate part 8 is positioned in contact with the front and rear parts between the front and rear parts 4, 6 so as to connect these parts. The front part 4, the rear part 6, and the intermediate part 8 are separately formed. An internal cover 52 is arranged in the intermediate part 8 so as to cover a part for the power circuit existing in the intermediate part 8. The cover 52 comprises a tongue piece 52a extended diagonally upward to the front part 8 extending a contact surface of the front and intermediate parts 4, 8 from the entire end part in a side of the front part 4 in the upper part of the cover 52, and a tongue piece 52b extended diagonally upward to the rear part 6 over a contact surface of the rear and intermediate parts 6, 8 from the entire end part in a side of the rear part 6 in the upper part of the cover 52. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power supply device, for example, a welding power supply device.

  There are various types of welding such as manual welding and TIG welding. A power supply for a welding machine corresponding to these types is used. The basic configuration is generally as follows. The commercial AC voltage is converted into a DC voltage by the input side rectifier and the smoothing capacitor. This DC voltage is converted into a high-frequency voltage by an inverter. This high frequency voltage is transformed to a predetermined voltage by a transformer. The transformed high frequency voltage is converted into a DC voltage by the output side rectifier and supplied to the load. If necessary, this DC voltage is converted into a low-frequency AC voltage and supplied to the load. In this power supply device, since the DC voltage is converted into the high frequency voltage by the inverter, a small transformer can be used, and the entire power supply device can be downsized.

  As described above, types of welding include manual welding, direct current TIG welding, and alternating current TIG welding.

  When performing manual welding, the welding power supply device has a constant current output characteristic in which the output current is constant even when the output voltage varies. An output current setting device for setting the output current value is provided on the panel of the power supply device for manual welding. In addition, in the case of manual welding, when starting the welding or when the load consisting of the torch and the base material is short-circuited, for example, a current larger than the output current is passed to perform a hot start that generates an arc well. Sometimes. A hot start setting device for setting a current to flow during the hot start is provided on the panel. The panel is also provided with a display for displaying the output voltage and output current.

  DC TIG welding is suitable for welding stainless steel, for example, and has constant current output characteristics. Moreover, a hot start may be required like manual welding. In direct current TIG welding, when a flat base material is welded, the output current is set to a constant value. However, when welding a base material such as a pipe, especially when welding the bottom of the pipe, if a constant output current is supplied, the melt from the pipe falls from the base material and re-welds. May become necessary, or the melt may adhere to the TIG welding electrode of the torch and damage the welding electrode. Therefore, when the output current is changed to a pulse current and the base current IB of the pulse current flows, for example, the molten pool formed at the bottom of the pipe is cooled, and the molten material falls from the molten pool or the torch is welded. This prevents the melt from adhering to the electrode.

  In TIG welding, as a method for generating an arc, a touch start method in which a welding electrode and a base material are short-circuited, a low current is passed through them, the welding electrode is separated from the base material, and an arc is generated between the two. And a high frequency start method in which an arc is generated by separating a welding electrode from a base material in advance and applying a high frequency and high voltage of 5 to 20 kV, for example, at 1 to 3 MHz between them.

  The panel of the DC TIG welding power supply device is provided with an output current setting device and a hot start setting device for setting the output current. Furthermore, the up-slope time to start up from the starting current when supplying the pulse current as the output current to the maximum pulse current (set output current), and the down-slope time to reduce from the maximum pulse current to the crater current that flows at the end of welding The up-slope and down-slope time setters for setting each of these are also provided on the panel. Further, a pulse frequency setting device for setting the frequency of the pulse current and a pulse switching device for switching between supplying the pulse current or the direct current are provided on the panel. In addition, an arc start switch for switching between a touch start and a high frequency start is also provided on the panel. In addition, a display for displaying the output voltage and output current is also provided on the panel.

  AC TIG welding is used, for example, when welding aluminum. Since aluminum has a participation melting film with a high melting point, when a current is passed using the DC power supply device with the base material as the positive electrode and the welding electrode as the negative electrode (positive polarity), the base material becomes hot. In other words, welding cannot be performed. Therefore, when a base material is used as a negative electrode, an electrode as a positive electrode (negative polarity), and a current is passed, thermoelectrons are released from the base material, an oxide film is removed (cleaning effect), and welding becomes possible. However, in the case of positive polarity, there is a cooling effect for cooling the electrode. Therefore, in the case of AC TIG welding, both a cleaning effect and a cooling effect are obtained. By adjusting the positive polarity time and the negative polarity time, both effects can be brought into a desired state.

  There is an AC / DCTIG welding machine that can be used for both AC TIG welding and DC TIG welding. On the panel of the AC / DC TIG welding machine, switch the output current setting device, hot start setting device, up slope time and down slope time setting device, pulse frequency setting device, presence / absence of pulse current for DC TIG welding A pulse switch, an arc start switch for switching between touch start and high frequency start, an output voltage and output current indicator are provided on the panel, and for AC TIG welding, the frequency of the voltage during AC welding Also provided on the panel is a frequency setting device for setting the ratio and a waveform balance setting device for setting the ratio between the positive polarity and the negative polarity.

  When these various welding power supply devices are manufactured individually, the manufacturing is troublesome. Since various settings are required for the above-mentioned various types of welding, when trying to manufacture a single power supply device that can be used for various types of welding, the panel requires a large number of setting devices, and its configuration is complicated. In addition, the setting of each setting device becomes troublesome.

  Therefore, the applicant of the present application has proposed a power supply device as shown in Japanese Patent Laid-Open No. 10-3079. This power supply apparatus has a welding process setting push button for setting a welding process such as manual welding or direct current TIG welding on the panel, a parameter setting push button for selecting parameters of each welding process after the selection of the welding process, and one piece. The setting device is provided, and with this setting device, the output current, the output voltage, and the like are adjusted to cope with various types of welding. In addition to this, the panel is provided with a process indicator, a parameter indicator, an up / down push button, an output voltmeter, and an output ammeter.

  By the way, the power supply apparatus for welding machines is not only used indoors but also used outdoors, and it is necessary to take measures against drip and dust. Therefore, a drip-proof and dust-proof cover is provided on the above panel.

  An object of the present invention is to provide a power supply device in which rainwater does not come into contact with power supply circuit components.

  A power supply device according to the present invention includes a case and a power supply circuit accommodated in the case. The case is disposed so as to be opposed to each other with an interval, and is formed between the front part and the back part formed separately, and between the front part and the back part, and the front part and the back part are An intermediate portion formed separately from the front and back portions, which is in contact with the front and back portions so as to be connected. A sheet is disposed in the intermediate portion so as to cover the power circuit component in the intermediate portion. The sheet has a first tongue piece extending obliquely upward from the entire end portion of the upper portion on the front portion side to the inside of the front portion beyond the contact surface between the front portion and the intermediate portion; and And a second tongue piece extending obliquely upward from the entire upper end portion on the back surface side to the back surface portion beyond the contact surface between the back surface portion and the intermediate portion.

  With this configuration, even if rainwater enters from the contact surface between the front portion and the intermediate portion, for example, it flows to the seat side through the first tongue piece portion, so rainwater is applied to the power circuit components surrounded by the seat. There is no contact. The same applies when rainwater enters from the contact surface between the back surface portion and the intermediate portion.

  Furthermore, the cable can be introduced from the outside to the inside of the case through an introduction port provided in the case. In this case, a first clamp portion is formed integrally with the case in the vicinity of the introduction port. The 1st clamp part is formed in the shape which encloses the substantially half of the circumferential direction of the said cable. A second clamp portion that surrounds the other half of the cable is attached to the first clamp portion so as to surround the entire circumference of the cable together with the first clamp portion.

  If comprised in this way, since the 1st clamp part is integrally formed in the case, a 2nd clamp part is made to contact a cable so that a cable may be pressed on a 1st clamp part, and a 2nd clamp part is made into a 1st clamp part. By attaching to the cable, the cable can be clamped. Therefore, the clamping work can be easily performed.

  Moreover, a 1st protrusion part can be made to protrude toward the other of the contact surfaces of the said front part and intermediate part in one of the contact surfaces of the said front part and the said intermediate part. In this case, a first concave portion into which the first protruding portion enters is provided on the other of the contact surfaces of the front portion and the intermediate portion. A second projecting portion is projected from one of the contact surfaces of the back surface portion and the intermediate portion toward the other of the contact surfaces of the back surface portion and the intermediate portion. On the other of the contact surfaces between the back surface portion and the intermediate portion, a second concave portion into which the second protrusion portion enters is provided.

  When configured in this way, the first protrusion is engaged with the first recess and the second protrusion is engaged with the second recess, so that the joining of the front portion and the intermediate portion is not shifted, Similarly, the joining of the back portion and the intermediate portion does not shift.

  As described above, according to the present invention, since the tongue that extends beyond the mating surfaces of the front and back portions is provided on the inner cover in the middle portion, the mating surface between the front portion and the middle portion, Even if water intrudes from the mating surface of the part and the back part, the power supply circuit does not get wet with water. Also, if a convex part is provided on one of the contact surfaces of the front part and the intermediate part, a concave part is provided on the other, a convex part is provided on one of the contact surfaces of the rear part and the intermediate part, and a concave part is provided on the other side. When the case is lifted, no deviation occurs between the front portion and the intermediate portion, and no deviation occurs between the intermediate portion and the rear portion.

  A power supply device according to an embodiment of the present invention is, for example, a welding power supply device, and includes a case 2 as shown in FIG. The case 2 includes a front part 4, a back part 6, and an intermediate part 8, and is made of a synthetic resin.

  The front part 4 and the back part 6 are formed in a substantially flat rectangular parallelepiped shape having the same outer dimensions. The front part 4 and the back part 6 are arranged to face each other with a predetermined interval.

  The intermediate portion 8 is arranged so as to contact the back surface of the front portion 4 and the front surface of the back portion 6. The intermediate part 8 is formed in a substantially rectangular parallelepiped shape, and is composed of a right intermediate part 8a and a left intermediate part 8b as shown in FIGS. These right side and left side intermediate portions 8a and 8b are substantially U-shaped with the longitudinal cross-section laid sideways as shown in FIG. 3, and abut end portions thereof. A power supply circuit (not shown) of a welding power supply device is disposed in the intermediate portion 8. In addition, the handle 9 is formed so that it may be located in the upper center of the intermediate part 8 in the state which faced the right side and left side intermediate parts 8a and 8b.

  As shown in FIG. 4, a recess 10 is formed in the upper part of the front part 2 so as to face somewhat obliquely downward. A panel 12 is disposed in the recess 10 as shown in FIG. The panel 12 is provided with operation elements such as switches and volumes (not shown) for setting various parameters for adjusting the characteristics of the power supply device.

  A dust-proof cover 14 is attached to the recess 10 so as to cover the panel 12 as shown in FIG. Although this cover 14 is transparent and not shown in FIG. 4, the setting state of the panel 12 can be confirmed from the outside even when the cover 14 covers the panel 12. In FIG. 4, reference numeral 16 denotes a single operator, which protrudes outward from the cover 14 so that it can be operated from the outside even when the cover 14 covers the panel 12.

  As shown in FIG. 6, disks 18 and 18 are formed on the upper portions of both side surfaces of the cover 14. The shafts 20 and 20 protrude outward from the center of the disks 18 and 18 substantially perpendicularly to both side surfaces. As shown in FIG. 7, a plurality of convex portions 22 protrude outward at equal angles on a circumference centered on the centers of the shafts 20 and 20.

  On the other hand, in the recess 10, when the cover 14 covers the panel 12, the shafts 20, 20 can be rotated at positions on both sides corresponding to the shafts 20, 20 of the cover 14 as shown in FIG. 5. Bearings to be supported, for example, shaft holes 24, 24 are formed. Around these shaft holes 24, 24, recesses, for example, circular holes 26, 26, into which each protrusion 22 can enter and engage are formed so as to correspond to each protrusion 22. The angles formed by the circular holes 26 are equal to the angles formed by the convex portions 22.

  Since the shafts 20 and 20 of the cover 14 are inserted into the shaft holes 24 and 24, the cover 14 rotates around the shafts 20 and 20, and the cover 14 can be opened and closed as shown by a dotted line in FIG. It is. In addition, during this rotation, the circular holes 26 with which the convex portions 22 engage are sequentially changed, so that the cover 14 can be fixed at predetermined angles. Therefore, as shown in FIG. 1, the cover 14 can be fixed at a desired rotational position. Therefore, it is not necessary to hold the cover 14 by hand when operating the operation element of the panel 12, and the parameter can be easily set.

  In FIG. 4, reference numeral 28 denotes a positive output terminal, reference numeral 30 denotes a negative output terminal, and reference numeral 32 denotes an inert gas output terminal. Reference numeral 34 denotes a window for introducing air into the case 2. Reference numeral 36 denotes a connection terminal of the torch switch.

  As shown in FIG. 8, a cable, for example, a power cable 38 is introduced into the back surface portion 6. This is for supplying commercial AC power to the power circuit in the case 2. In order to prevent the power cable 38 from coming off from the case 2, the power cable 38 is clamped by a clamper 40. As shown in FIG. 9, the clamper 40 includes a first clamp part 40a and a second clamp part 40b. These are both made of synthetic resin, and the first clamp portion 40 a is formed integrally with the back surface portion 6. The first clamp portion 40 a has a recess 44 that surrounds the outer periphery of about 3/4 of the circular inlet 42 of the power cable 38 formed on the back surface portion 6. The second clamp portion 40 b is formed separately from the back surface portion 6, and has a recess 46 that can surround the remaining outer periphery of the circular introduction port 42.

  The power cable 38 is brought into contact with the concave portion 44 of the first clamp portion 40a, and the recess 46 of the second clamp portion 40b is made to press the power cable 38 toward the first clamp portion 40a. The fixing means, for example, bolts 48, 48 are inserted from the second clamp part 40b side, screwed into the first clamp part 40a, and the second clamp part 40b is attached to the first clamp part 40a. Secure and clamp the power cable 38.

  In the clamper 40, the first clamp portion 40 a is formed integrally with the back surface portion 6. Conventional clampers that have been used correspond to the first clamp portions 40a and 40b, which are formed separately from the case. Therefore, if the clamper corresponding to the first clamp portion 40a is not attached to the case, The workability was low. However, in this clamper 40, since the first clamp part 40a is formed integrally with the back face part 6, the work of attaching the first clamp part 40a to the back face part 6 is unnecessary, and the clamping work is made efficient. Can do. Moreover, since the first and second clamp portions 40a and 40b are made of synthetic resin, they do not rust.

  Note that reference numeral 50 in FIG. 8 denotes an inert gas input terminal. Reference numeral 51 also denotes a window for exhausting the air that has flowed through the case 2.

  As shown by a dotted line in FIG. 1, an inner cover 52 is disposed in the intermediate portion 8 so as to cover the power supply circuit. The inner cover 52 is formed by covering both surfaces of a conductive material such as a metal foil, specifically an aluminum foil or a copper foil, with a material having rust resistance and heat resistance, for example, a resin such as heat resistant vinyl chloride or heat resistant polyester. Is. A carbon resin having conductivity can be used instead of the metal foil. What coat | covered both surfaces of metal foil with said material is comparatively flexible, and can be made into a desired shape by making a suitable cut | incision in a plate-shaped thing, and bending.

  As shown in FIG. 10, the inner cover 52 has an upper wall 52U, and both side walls 52R and 52L extending downward from the longitudinal edge of the upper wall 52U. As shown in FIG. 1, the upper wall 52 </ b> U is located close to the upper wall of the intermediate portion 8 and has a size that substantially matches the upper wall of the intermediate portion 8. Both ends of the upper wall 52U are located in the intermediate portion 8 that is in the vicinity of the contact surface between the intermediate portion 8 and the front portion 4 and the contact surface between the intermediate portion 8 and the rear portion 6. The side walls 52R and 52L are in contact with the bottom wall of the intermediate portion 8. The inner cover 52 is connected to a reference potential point of the power supply circuit at an appropriate position. Accordingly, the inner cover 52 functions as a shield case.

  Furthermore, the tongue piece part 52a is formed toward the inside of the front part 4 from the edge part by the side of the front part 4 of the upper wall 52U. The tongue piece 52a has a first inclined portion 52a-1 that is inclined obliquely upward from an end portion on the front surface 4 side of the upper wall 52U, and subsequently, from the first inclined portion 52a-1. The second inclined portion 52a-2 has a gentle inclination. Similarly, a second tongue piece 52b is formed from the end of the upper wall 52U on the back surface 6 side. The tongue piece portion 52b also has first and second inclined portions 52b-1 and second inclined portions 52b-2 similar to the first and second inclined portions 52a-1 and 52a-2.

  Further, tongue pieces 52c and 52c are formed so as to enter the front portion 4 from the end portions of the side walls 52R and 52L on the front portion 4 side. Similarly, tongue pieces 52d and 52d are formed so as to enter the back surface portion 6 from the end portions of the side walls 52R and 52L on the back surface portion 6 side. These tongue pieces 52 c, 52 c, 52 d, 52 d also extend almost to the vicinity of the bottom walls of the front part 4 and the back part 6.

  Since the inner cover 52 includes a conductive material inside, the inner cover 52 functions as a shield case, and a high-frequency signal from a noise source in the vicinity of the power supply device is covered by the inner cover 52. This prevents the power supply circuit from malfunctioning when it arrives at the circuit. Furthermore, the upper wall 52U receives water that has entered from the mating surface 54 at the upper part of the right intermediate part 8a and the left intermediate part 8b of the intermediate part 8 shown in FIG. Therefore, it is possible to prevent the power supply circuit in the inner cover 52 from getting wet by water that has entered from the mating surface 54. Further, water that has entered from the mating surface 56 of the front surface portion 4 and the intermediate portion 8 or the mating surface 58 of the back surface portion 6 and the intermediate portion 8 flows along the tongue pieces 52a and 52b to the upper wall portion 52U side. Accordingly, it is possible to prevent the power supply circuit in the inner cover 52 from getting wet by water that has entered from the mating surface 56 or 58.

  For example, Japanese Patent No. 3235777 discloses a cover including an upper wall 52U and side walls 52R and 52L. In this case, since water corresponding to the tongue pieces 52a and 52b is not provided, it is not possible to cope with water that has entered from the mating surfaces 56 and 58.

  As shown in FIG. 11B, a plurality of, for example, two convex portions 60 projecting toward the front portion 4 side are formed on the upper portion of the contact surface with the front portion 4 of the intermediate portion 8. These convex portions 60 are provided at the right end portions of the right intermediate portion 8a and the left intermediate portion 8b, as shown in FIG. In a state in which the intermediate portion 8 and the front portion 4 are in contact with each other in the vertical direction, the upper portion of the surface of the front portion 4 on the side of the intermediate portion 8 is so arranged that the convex portions 60 and 60 come into contact with each other. As shown in FIG. 12, recesses 62 and 62 are formed at both outer ends corresponding to the protrusions 60 and 60. Similarly, convex portions 64 and 64 projecting toward the back surface portion 6 are formed at the upper outer ends of the contact surface of the intermediate portion 8 with the back surface portion 6. Further, although not shown in the drawing, the back surface portion 6 so that the convex portions 64 and 64 come into contact with each other in a state where the intermediate portion 8 and the back surface portion 6 are in contact with each other without any vertical displacement. Two recesses are formed on the surface of the intermediate portion 8 side.

  Thus, since the convex parts 60 and 60 are brought into contact with the concave parts 62 and 62 on the front face 4 side and the convex parts 64 and 64 are brought into contact with the two concave parts on the back face part 6 side, Even if the case 2 is gripped and the case 2 is lifted, the front portion 4 and the intermediate portion 8 are not displaced in the vertical direction, and similarly, the intermediate portion 8 and the rear portion 6 are not displaced in the vertical direction.

  If such a convex part or concave part is not provided, when a person grasps the handle 9 and lifts the case 2, there is a relatively heavy thing such as a power circuit in the intermediate part 8. On the other hand, since there is no heavy object in the front part 4 and the back part 6, vertical displacement occurs between the front part 4 and the intermediate part 8 and between the back part 6 and the intermediate part 8. . However, by providing the convex portions 60 and 60, the recesses 62 and 62, etc., it is possible to prevent such a shift from occurring.

  In the above embodiment, the cover 14 is provided with the shaft 20 and the convex portion 22, and the shaft hole 24 and the circular hole 26 are provided on the recess 10 side, but conversely, the cover 14 is provided with the shaft hole 24 and the circular hole 26. The shaft 20 and the convex portion 22 can be provided on the recess 10 side. Moreover, although the convex part 22 was provided with two or more, what is necessary is just to provide the convex part 22 at least once. Further, in the above embodiment, the first clamp part 40a and the second clamp part 40b are fixed by bolts, but the present invention is not limited to this, for example, a fixture having hooks at both ends is formed, Holes that engage with these hooks can also be provided in the first and second clamp portions 40a, 40b. In the above embodiment, the inner cover 52 is provided with the tongue pieces 52c and 52d. Further, in the above embodiment, the convex portions 60 and 64 are provided on the intermediate portion 8 side, and the concave portions are provided on the front portion 4 and the back portion 6 side, but conversely, the concave portions are provided on the intermediate portion 8 side. A convex part can also be provided in the front part 4 and the back part 6 side. In the above-described embodiment, the intermediate portion 8 is configured by the right and left intermediate portions 8a and 8b. However, the intermediate portion may be formed in a rectangular parallelepiped shape having a hollow interior and an open front and back.

It is a side view of the power supply device of one Embodiment of this invention. It is a top view of the power supply device of FIG. It is a vertical front view of the intermediate part of the case of the power supply device of FIG. It is a front view of the power supply device of FIG. It is a partial omission vertical side view of the front part of the case of the power supply device of FIG. FIG. 2 is a partially omitted plan view of a cover of a case of the power supply device of FIG. 1. It is a partially broken side view of the cover of FIG. It is a rear view of the power supply device of FIG. FIG. 2 is a partially omitted enlarged view of the rear portion of the power supply device of FIG. 1. FIG. 2 is a partially omitted perspective view of an inner cover used in the power supply device of FIG. 1. It is the top view and side view of the intermediate part of the case of the power supply device of FIG. FIG. 2 is a partially omitted rear view of the front portion of the case of the power supply device of FIG. 1.

Explanation of symbols

2 Case 4 Front section 6 Back section 8 Middle section 52 Inner cover (sheet)
52a Tongue piece (first tongue piece)
52b Tongue piece (second tongue piece)

Claims (3)

Case and
The power supply circuit housed in this case
In the power supply device comprising:
The case is disposed so as to be opposed to each other with an interval, and is formed between the front part and the back part formed separately, and between the front part and the back part, and the front part and the back part are An intermediate part formed separately from the front part and the back part, in contact with the front part and the back part so as to connect;
A sheet is disposed in the intermediate portion so as to cover the parts for the power supply circuit in the intermediate portion,
The sheet has a first tongue piece extending obliquely upward from the entire end portion of the upper portion on the front portion side to the inside of the front portion beyond the contact surface between the front portion and the intermediate portion; and And a second tongue piece extending obliquely upward from the entire end portion on the back surface side to the back surface beyond the contact surface between the back surface portion and the intermediate portion. The power supply device according to claim 1, wherein a cable introduced from an outside of the case to an inside through an introduction port provided in the case;
A first clamp part formed integrally with the case in the vicinity of the introduction port and surrounding substantially half of the circumferential direction of the cable;
A second clamp portion that is attached to the first clamp portion so as to surround the other half of the cable and surround the entire circumference of the cable together with the first clamp portion;
Power supply device provided. The power supply device according to claim 1, wherein
A first projecting portion projecting toward one of the contact surfaces of the front portion and the intermediate portion toward the other of the contact surfaces of the front portion and the intermediate portion;
A first recess provided on the other of the contact surfaces of the front portion and the intermediate portion, into which the first protrusion enters,
A second projecting portion projecting toward one of the contact surfaces of the back surface portion and the intermediate portion on the other of the contact surfaces of the back surface portion and the intermediate portion;
A second recess provided on the other of the contact surfaces of the back surface portion and the intermediate portion and into which the second protruding portion enters,
Power supply device provided.

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