Unit for contact ac welding, switching module for welding current transformer control, and method of making said switching module

FIELD: process engineering.

SUBSTANCE: switching module has, at least, comprises, at least, one switch 2A composed of power semiconductor device, cooling appliance 3A of electrically conducting material and current feed appliance 1A abutting switch 2A whereon abuts switch 2A to cool switch 2A. Insulation means 8A is arranged between cooler 3A and current feeder 1A to isolate cooler 3A from current feeder 1A. Switch 2A, cooler 3A, current feeder 1A and insulator 8A are configured to arranged cooler at no potential which allows decreasing length of coolant feed pipes.

EFFECT: compact design.

11 cl, 2 dwg

 

The present invention relates to a switching module, to its manufacturing process and to an apparatus for welding with alternating current with switching module.

Development of new welding systems requires a permanent increase in the density of installation of power e, respectively, of the power semiconductor components to reduce the structural size of the device to the minimum possible. Such a permanent increase in the density mounting of electronic components in turn is driven by the need for active removal dissipated their power, i.e. the emitted during operation of the heat. Usually electronic components screw with thermal contact to an extruded hollow profiles, through which flows a cooling medium, such as circulating in the cooling circuit coolant. As a material for the manufacture of extruded hollow profiles are suitable, for example, aluminium, due to its inherent characteristics, primarily due to the inherent exceptionally high thermal conductivity and good suitability for processing by pressing a bump.

In DE 10245288 A1 describes the power part of the Converter current and the method of its manufacture. Power part of the Converter current is schematically shown in section in Fi is .1 of this publication. In such power part on the heat sink is mounted bipolar transistor with insulated gate (IGBT), and also placed the diodes tablet design. The collector is depicted on the specified drawing IGBTs misconducting copper bus large area connected to the cathode of the diode tablet design. The emitter of the IGBTs other misconducting copper bus large area connected to the anode of diode tablet design. In the area of the IGBT both copper bus bars are separated and electrically isolated from each other by an insulating layer. Figure 1 is a given publication is clearly seen that the conductive bus located directly on the heat sink. Figure 1 shows only one-sided cooling of the diode tablet design. In this publication also States that the upper side of the diode to increase the efficiency of its use can also arrange additional heat sink. In accordance with this, the feed bars were placed between two heat sinks.

Similar devices are also known for their use in power management systems contact welding alternating current. In this case, between the two heatsinks aluminum usually are the two thyristor tablet design, the current which is supplied by electrically conductive aluminum heatsinks. So about what atom, heatsinks are used simultaneously for the supply current and thus are also under capacity under the feed bars. Usually the heatsinks for the possibility of exchange between coolant and connect the hoses to it. For this purpose, the coolant must do her first inlet of the first heat sink and pass then through the corresponding connection from the first heat sink in the second. The coolant again exits the second heat sink through the outlet. For the connection between the heatsinks and to supply to the first heat sink coolant and its outlet from the second heat sink according to the prior art use a special hose. These hoses are subject to extreme high demands regarding their electric strength, because they must ensure the connection between the first and second heat sinks, which are at different electrical potentials. Apart from that, these hoses are attached also to the case management system welding and thereby automatically connected with the ground potential as the grounded. Hose connections to the circulation circuit with a pump housing, there are additional connection.

The drawback of this design is, h is about because of the prevailing potential difference between the heatsinks, and between the heatsinks and located on the body connections for hoses, they are essentially must have a certain length, so that between the potentials, which is the power part and the ground potential constantly had the required dielectric strength. Hoses such specified depending on the electric strength of the spatial length needs to be placed inside a compact housing management system welding, which requires a corresponding installation space. In addition, you must use a special hose that have a high cost. Therefore known from the prior art design is not too compact and is expensive to manufacture due to the cost of installation of the hoses, as well as the high cost themselves a special hose.

The present invention was used to find a solution which would almost completely eliminate the above disadvantages.

This task is solved according to the invention with the help of the switching module to control the welding transformer installation for welding with alternating current, implemented on the primary side of the welding transformer having at least one switching means in the form of a power semiconductor arr is RA, coolant from electrically conductive material and the current-carrying means which is adjacent to the switching means and to which cooling switching means adjacent the cooling means, while between the cooling means and the current-carrying means is an insulating means so that switching on and operation of the device coolant was not under an electric potential of the current-carrying means.

The advantage of the invention is the ability to use between the first and second heatsinks connection is much much smaller length. In principle this purpose it is enough to use a short U-shaped hose or U-shaped pipe connecting the outlet of the first cooling means to the input of the second coolant. As the connecting pipe, respectively, for supplying a cooling medium, you can use the most simple copper or aluminum tube, since the cooling means are under the same electric potential.

In contrast to the known from the prior art hoses used to connect between a cooling means, respectively, for connecting the input of one and another of them with the appropriate connections for slango is on the case, the length of such hose can according to the invention to choose regardless of electric potential. This lowers the constructive dimensions of a control system of welding, and also reduces the cost of manufacture. In addition, the costs for installation of the hoses, as well as on the acquisition of themselves hoses.

Another advantage of the proposed invention is that the current-carrying means directly adjacent to the switching means, i.e. not connected with him indirectly through the cooling means, and thanks also used for heat dissipation. Since the current-carrying means in the form of tires, switching means which usually have a tablet design across its entire surface, respectively, over a large area, adjacent to the tire, so as to optimize heat transfer.

In the proposed invention, the switching module in the preferred embodiment, there is a second switching means, the second cooling means and the second current-carrying means, the first contact pin switching means is adjacent to the first current-carrying means, and the second contact pin switching means is adjacent to the second current-carrying means, as a result of the and switching means is enabled by the counter-parallel scheme between the two current-carrying means, switching means and feed means are located between the first and second cooling means, and between the second current-carrying means and the second cooling means is also located one - second insulating means.

In this way possible to obtain an extremely compact design with both sides effectively cools the switching means, which are usually designed for switching currents of very large power (ka), for example for welding, and bring to them the electric current.

Such compact design proposed in the invention switching module allows you to easily and compactly to place it into the case management system by welding.

As an insulating means it is most preferable to use electrically insulating and thermally conducting film or plate. In the preferred embodiment it is made of thermoplastic or made from synthetic polymers insulating means. Such films are, respectively, the plates can be purchased at a reasonable price, and without significant costs can easily be placed in the manufacture of switching modules between current-carrying means and cooling means, thereby isolating from each other both tools across their surface such films, the plates respectively.

In a preferred embodiment, the insulating means is additionally reinforced with reinforcing means, such as fiberglass, sealed in foil, respectively, in the plate. This reinforcement prevents damage film under the action may arise during the installation switching module compressive or shear forces.

Switching means, cooling means, feed means and the insulating means is preferably clamped between the two clamping means. Such clamping means may consist, for example, two clamping element in the form of plates adjacent on both sides to the cooling means and pressed against thereto by nuts screwed from both ends at the missed through these cooling means of the threaded rod. Under the action of such external forces applied to the cooling means of nuts and clamping elements, all components, including insulation means, firmly pressed to each other with the formation of the compact and mechanically stable structure.

In a particularly preferred embodiment, the switching module has a connecting means placed between the cooling means and enabling exchange between the cooling fluid. First cooling means has an input for who is agnosti feed it the cooling medium, which may flow through the specified connection means from the first coolant to the second cooling means and then through the existing exit again to exit from the second coolant. In this way it is possible to realize the circulation of the cooling medium, providing the maximum amount of heat directly from its source.

As the coolant is most preferable to use a hollow profile, for example, from aluminum.

Under used in switching module switching means in the preferred embodiment refers to power semiconductor devices, first of all thyristors tablet designs that are inexpensive products of mass production.

Equipment control welding are integrated into the housing of the power part with the proposed invention switching module allows you to perform such a control system welding is extremely compact and inexpensive, because provided according to the invention insulation for cooling switching module requires less supply lines.

In the manufacture proposed in the invention switching module to power parts of the welding device is usually first switching means, i.e. for example, the and the thyristors tablet design, have a current-carrying means, i.e. for example, the conductive bus. Then on the conductive bus is placed insulating means, such as an insulating film, after which the insulating means over the entire surface impose heatsinks and fix all this construction the above-mentioned clamping elements. Advantages design similar layout, already discussed above.

The object of the invention is also an installation for welding with alternating current having a welding transformer, welding and proposed in the invention of the switching module, and the first and second feed means are located between the control system of welding and the primary side of the welding transformer with the ability thereby to control the welding current or the control switching module.

The object of the invention is also a method of manufacturing a switching module to control the welding transformer installation for welding with alternating current, implemented on the primary side of the welding transformer, and the switching module has at least one switching means in the form of a power semiconductor device, the cooling means of the electrically conductive material and tocop DATASHEE means, namely, that the current-carrying means is disposed on the switching means, and cooling means for cooling the switching means is placed on the current-carrying means, and between the cooling means and the current-carrying means include insulating means electrically insulating them coolant from the current-carrying means.

Other preferred variants, distinguishing characteristics and specific embodiments of the invention are represented in the claims, the subsequent description of a possible implementation of the invention and the accompanying description of the drawings.

Below the invention is described in more detail on the example of some variants of its implementation with reference to the accompanying description of the drawings. In each of these drawings are presented only important for the explanation of the invention the elements. Attached to the description of the drawings in particular, it is shown:

figure 1 is a view in axonometric proposed in the invention of the switching module and

figure 2 - circuit diagram of the embedding proposed in the invention switching module installation for welding with alternating current without an image management system welding.

Figure 1 is a perspective view showing switching module with two thyristors 2A and 2B t is bleakney design, two cooling means 3A and 3B made of aluminium, two current-carrying means, respectively, the two conductive tires 1A and 1B, two insulating means 8A, 8B in the form of a reinforced insulating films (glass fiber reinforced silicon film or films produced under the trade name Kapton), as well as clamping element 4 (the second clamping element not shown) and threaded rod (stud) 9 screwed on him nut 10 (the second nut not shown). The thyristors 2A, 2B tablet designs located in the middle between the conductive buses 1A, 1B in such a way that their contact pins throughout their area adjacent to the buses 1A, 1B. On the buses 1A, 1B on both sides is glass fiber reinforced silicon film 8A, 8B, to which throughout its area adjacent the heat sink 3A, 3B respectively, and which he thus electrically isolated from the conductive bus 1A, 1B, respectively. Through this design passes the hole, respectively cylindrical channel that passed through him the threaded rod 9, when the screw nut 10 which has both its ends the whole structure is clamped between spaced from both sides of the clamping elements 4, which provides optimum electrical connection between the thyristors 2A and 2B, tabletos the first structure and the conductive busses 1A and 1B and optimal heat dissipation by the heat sinks 3A and 3B.

To the input 6 of the first heat sink 3A can be connected to a hose through which the heat sink 3A is fed pumped cooling medium. The connection 5 between the first heat sink 3A and the second heat sink 3B cooling medium may flow from the heat sink 3A in heat 3B and then back through the outlet 7 of the second heat sink back into the circulation loop with a pump.

Figure 2 is a schematic diagram of the setup for welding in alternating current, and first of all the welding transformer 11, controlled on the primary side proposed in the invention switching module 12, which provides the welding current is at located at the secondary side of the welding device 13, for example by welding clamp device for resistance welding. In addition, the drawing shows two points 14 current measurement, which allow you to register the change of welding current on the primary side and the secondary side and to transmit measurement data to the system 14 control welding.

The thyristors 2A, 2B proposed in the invention switching module unlocks to control the welding current in mode "current control" when asked constant value of the phase cutoff angle (firing angle of the thyristor). In the "current control" to calculate the new value of the phase at the La cutoff control welding is also used previously registered current.

1. Switching module to control the welding transformer installation for welding with alternating current, implemented on the primary side of the welding transformer having at least one switching means (2A) in the form of a power semiconductor device, the cooling means (3A) of electrically conductive material and the current-carrying means (1A), which is adjacent to the switching means (2A) and to which cooling switching means (2A) adjacent the cooling means (3A), characterized in that between the cooling means (3A) and current-carrying means (1A) is insulating means (8A), electrically insulating the cooling means (3A) from the current-carrying means (1A).

2. Switching module according to claim 1, in which is provided a second switching means (2B) in the form of a power semiconductor device, the second cooling means (3B), the second feed means (1B) and the second insulating means (8B), the first contact pin switching means (2A, 2B) adjacent to the first current-carrying means (1A), and the second contact pin switching means (2A, 2B) adjacent to the second feed means (1B), resulting in both switching means (2A, 2B) is enabled by the counter-parallel scheme, p reluctantly means (2A, 2B) are located between the two current-carrying means (1A, 1B) and the second current-carrying means (1B) is also adjacent insulating means (8B), where the cooling means (3B).

3. Switching module according to claim 1 or 2, in which the insulation means (8A, 8B) represents a film or plate with insulating and heat-conducting properties, preferably from a thermoplastic or synthetic polymers.

4. Switching module according to claim 1 or 2, in which the insulation means (8A, 8B) contains a reinforcing agent.

5. Switching module according to claim 1 or 2, in which the switching means (2A, 2B), the cooling means (3A, 3B), the current-carrying means (1A, 1B) and insulating means (8A, 8B) are located between the two clamping means (4A, 4B).

6. Switching module according to claim 2, in which the first (3A) and second (3B) cooling means connected between a connecting means (5) for sharing a cooling medium, while the first cooling means (3A) has an additional input (6) for the cooling medium and the second cooling means (3B) additionally has an outlet (7) for the cooling medium.

7. Switching module according to claim 1 or 2, in which the cooling means (3A, 3B) is a hollow profile for accumulation and transfer of coolant, especially hollow p is ofil from aluminium.

8. Switching module according to claim 1, in which the switching means (2A, 2B) in the form of a power semiconductor device are thyristors tablet design.

9. Installation for welding with alternating current having a welding transformer, welding and switching module according to one of claims 1 to 8, and first and second current-carrying means (1A, 1B) are located between the control system of welding and the primary side of the welding transformer with the ability thereby to control the welding current or the control switching module.

10. A method of manufacturing a switching module to control the welding transformer installation for welding with alternating current, implemented on the primary side of the welding transformer, and the switching module has at least one switching means (2A) in the form of a power semiconductor device, the cooling means (3A) of electrically conductive material and the current-carrying means (1A), namely, that the current-carrying means (1A) is disposed on the switching means (2A), and the cooling means (3A) for cooling the switching means (2A) is placed on the current-carrying vehicle (1A) and between the cooling means (3A) and the current-carrying means (1A) is raspolagayut insulating means (8A), electrically isolating them from the cooling means (3A) from the current-carrying means (1A).

11. The method according to claim 10, in which provide the second switching means (2B) in the form of a power semiconductor device, the second cooling means (3B), the second feed means (1B) and the second insulating means (8B), the first contact pin switching means (2A, 2) have on the first current-carrying vehicle (1A), and the second contact pin switching means (2A, 2B) disposed on the second current-carrying vehicle (1B), resulting in both switching means (2A, 2B) are enabled by the counter-parallel scheme, switching means (2A, 2B) is placed between the two current-carrying means (1A, 1B) and the second current-carrying means (1B) also put insulation means (8B), which are also equipped with cooling means (3B).



 

Same patents:

FIELD: electrical engineering.

SUBSTANCE: invention relates to a transformer winding stages switch with semiconductor switching elements for continuous switching between the two branches (branch n, branch n+1) of winding of a transformer with staged voltage control each winding branch is connected to the common load output via the corresponding mechanical switch (DS) and a series circuit of two oppositely placed IGBTs (IP, In), the circuit linked in series to the mechanical switch. According to the invention, each IGBT is shunted with a corresponding varistor (Vp, Vn), connected in parallel thereto and calculated in a special way.

EFFECT: no need for special setting to corresponding rated current.

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FIELD: electricity.

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EFFECT: higher functionality.

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FIELD: electricity.

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EFFECT: higher operational reliability of the drive, reduced labour intensiveness in manufacturing, higher accuracy of positioning during regulation.

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FIELD: electricity.

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Power accumulator // 2394297

FIELD: electrical engineering.

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5 cl, 4 dwg

FIELD: process engineering.

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26 cl, 16 dwg

FIELD: process engineering.

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FIELD: process engineering.

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18 cl, 14 dwg

FIELD: process engineering.

SUBSTANCE: invention may be used for welding with feed of fluxing powder. Welding set 1 comprises, at least, first container 4 for fluxing powder. Said first container 4 comprises outlet 6 with channel 7 to output powder. Welding set 1 has first element to feed heated gas in aforesaid first container. In compliance with proposed method, powder is kept in said first container. Heated gas is fed in first container to heat powder to be fed in welding zone 3.

EFFECT: uniform and sufficient heating of powder.

34 cl, 9 dwg

FIELD: metallurgy.

SUBSTANCE: contact assembly 1 comprises lengthwise axle 6, case 7, first contact device 32, second contact device 33 and third contact device 25. Third contact device 25 is arranged between first contact device 32 and second contact device 33 to displace relative to both. First contact device 32 features elongated shape to be fixed in case 7 and extend from first edge 24 located between case first edge 8 and second edge 9 to second edge 31. Second contact device 33 features elongated shape to be suspended by spring in case 7 and extend from first edge 17 located between case first edge 8 and second edge 9 to second edge 18.

EFFECT: uniform pressure on both welding wires.

23 cl, 7 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to welding guns for welding by metal electrode in atmosphere of active or inert gas. Gun comprises handle. Said handle has body 1 and stick 2. Stick 2 is arranged to turn relative to body 1 to extend partially through the length of said body. End of said stick may turn relative to body 1 through the distance that allows hand to be located between body 1 and stick 2 and body 1 to be located above hand. With stick end interacting with body 1, both stick and body make handle for hand.

EFFECT: ease of use.

5 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: cleaning device 1 comprises, at least, two coils 4, 11 and opening 3 for mounting torch 5, power supply 7 connected with said coils and, if required, with device to apply washing fluid on torch point 5. All components are arranged common case 2 and controlled one control device 8. To up the cleaning quality and increase cleaning zone, coils may be fed independently by said power supply. Cooler 14 is used to cooling coils 4, 11.

EFFECT: higher quality of gas cleaning.

13 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to device and method of measuring protective gas 8 in arc welding by analysing it after escape from gas nozzle 27 of torch 10. To analyse protective gas, external instrument incorporates, at least, one pickup 31. Said pickup 31 is arranged at distance 38 from torch 10 equal, in fact, to distance 38 between torch 10 and part 16 in welding to allow simulation of protective gas escape and effects like in actual welding conditions. Pickup 31 is connected with processing unit 32 and, via said unit, with welding apparatus.

EFFECT: fast, accurate and efficient estimation of protective gas effects.

43 cl, 6 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to welder inverter source and may find application in electrical engineering. Source body includes base, front and back panels with ventilation grates, detachable cover with side walls, and separating panel installed horizontally relative to base. This panel is fixed between front and back panels, which are joined to base and detachable cover to create an upper compartment. High-voltage and low-voltage electronic components are installed in upper compartment. Lower compartment is arranged in the form of air duct, which is equipped with fan and at least the first and second radiators for cooling of the following components installed in it - power transformer, throttles and power rectifying modules. Separating panel has an opening for installation of the first radiator with its flat horizontal surface inside the upper compartment. The first and second radiators are installed with vertical location of fins relative to base and are fixed on separating panel with longitudinal installation of fins relative to air flow direction from fan. The second radiator is fixed with vertical displacement relative to separating panel with creation of gap. Power rectifying modules are installed in specified gap on flat horizontal surface of this radiator.

EFFECT: higher reliability of source operation.

9 cl, 9 dwg

FIELD: welding jobs.

SUBSTANCE: invention relates to Electrode holder for manual electric arc welding (versions) and electrode magazine for aforesaid electrode holder and can be used in machine building for producing welding parts. The proposed electrode holder comprises a clamp, handle and magazine. The said clamp represents two two-tooth or four-tooth forks turning relative to each other. Clamp opening brings about a forced removal of electrode calcine from the clamp opening. Note that the electrode holder can be reloaded blindly, not touching the electrode. Note also that the magazine van be detached from the electrode holder and used independently.

EFFECT: higher efficiency of welding.

7 cl, 39 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to power supply of contact welding machine. Proposed power supply incorporates capacitor to partially compensate for inactive components of 1st harmonic full power. Semiconductor staticcompensator compensates for remaining inactive components. Voltage relay to control connection of said capacitor is connected via normally open contacts of the switch parallel to primary of welding transformer to control said capacitor and semiconductor static compensator.

EFFECT: descreasing of higher harmonic components and reducing consumption of inactive components.

1 dwg

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