RU2508970C1 - Device for gas-flame works - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal processing, particularly, to devices for gas-flame processing, say, soldering, welding, cutting of metals with the help of electrochemical production of detonating gas for said purposes. Proposed device comprises burner, hydraulic lock, electrolytic cell to extract hydrogen and oxygen for production of detonating gas, supply unit and pipeline. Said electrolytic cell is composed of the battery of separated electrolytic cells connected in series. Poles of the battery are connected to antipoles of supply unit. Said separate electrolytic cell represents a waste pre-discharged cell of iron-nickel alkaline accumulator. Said cells are equipped with detonating gas discharge branch pipes connected with pipeline communicated with hydraulic lock. Hydraulic lock exploits water emulsion with hydrocarbon compounds for correction of flame composition. Besides, hydraulic lock is furnished with means for separation of drops from gas mix.

EFFECT: simplified and cheap design.

2 dwg

Description

The invention relates to technological processes for the processing of metals, and more particularly to devices for performing flame works, such as soldering, welding, cutting metals, using electrochemical methods for producing detonating gas to perform these works.

The device for gas-flame work according to the first embodiment (RU 2283736, MPK V23K 1/012, V23K 5/00, V23K 31/10, V23K 7/06, S03V 9/00, S25V 9/00, S25V 9/08 was adopted as the closest analogue , С25В 9/20, published on August 27, 2005,) containing a burner with a casing, a water trap, an electrolyzer for hydrogen and oxygen evolution to produce explosive gas, a rectifier, pipelines, a control unit, a feed vessel connected by a pipeline to discharge the resulting explosive gas with water lock and burner, capillary and valve. The electrolyzer is made with flow-through make-up and consists of alternating bipolar electrodes, dielectric spacers, end plates, which serve as the anode and cathode, fasteners, inlet and outlet pipes. In each bipolar electrode, two holes are located at different heights, and the electrodes are placed between the end plates, separated by dielectric gaskets and pulled together by fasteners. The outlet pipe is connected by a pipeline to a feed vessel connected through a capillary and a valve to an inlet pipe, the feed vessel being electrically connected to an end plate serving as an anode, and the valve is electrically connected to an end plate serving as a cathode.

The disadvantages of the described device include the complexity of the design and its high cost, because, for example, the feeding system of the electrolyzer itself (valves, capillaries, etc.) is rather complicated, the design of the water seal and burner are complicated. The liquid feed stream, despite its zigzag shape, through the lower holes in the bipolar electrodes leads to an increase in heat loss at the internal resistance of the device. Nickel coating on one side of the bipolar electrode complicates the technology of their manufacture. The presence of dielectric spacers between bipolar electrodes inevitably leads to their aging and the need for periodic replacement. The presence of pressure gauges, safety membranes, a spool, preloaded by a spring, and other elements of the hydraulic lock complicates both the design and operation of the device. When welding and soldering, hydrocarbon compounds must be added to the explosive gas to obtain the optimal composition of the combustible mixture. The supply of gas from the cylinder through the nozzle on the burner leads to a significant complication of the burner itself and makes the installation cumbersome.

The invention solves the problem of reducing the cost of a device for carrying out flame work by simplifying the design and reducing the cost of manufacturing an electrolyzer and a water seal.

To obtain the desired technical result in a known device for flame works, containing a burner, a water trap, an electrolyzer for hydrogen and oxygen to produce explosive gas, a power supply and control unit, a pipeline, it is proposed to perform the electrolyzer in the form of a battery composed of separate electrolysis cells connected in series current, moreover, connect the battery poles to opposite poles of the power supply. It is proposed to use a spent battery and a pre-discharged can of an iron-nickel alkaline battery as a separate electrolysis cell, and provide the cells with outlet pipes for exhausting the resulting detonating gas associated with a collection pipe connected to a water seal. It is proposed to use an aqueous emulsion with hydrocarbon compounds in the water seal to correct the composition of the flame, in addition, the water seal is equipped with a droplet separator from the gas mixture.

The design of the electrode plates of iron-nickel alkaline batteries, made of perforated nickel-plated steel in the form of tubular elements filled with active mass (positive plates - oxide hydrate - nickel oxide and nickel petals, negative plates - finely ground iron - iron oxide hydrate), has a branched surface, which actively participates in the process of gas formation, which means that with the same weight and size characteristics with the closest analogue, the proposed design has a larger output d of gas. In addition, the chemical composition of the electrodes provides a transient voltage on a single cell of up to 1.7-1.9 V, which is slightly lower than when using traditional electrodes made of steel St.3 or stainless steels (2.0-2.2 V), which allows to obtain higher energy characteristics.

In the proposed design, there is no message of the individual electrolysis cells of the battery through the electrolyte, which reduces the heat loss on the internal resistance of the device. The used serial circuit for connecting the electrolysis cells of the battery in current reduces the total current consumption, which means that at a given power, in accordance with the Lenz-Joule law, heat losses are reduced. The implementation of the electrolyzer from separate electrolysis cells allows you to make the entire installation more compact, convenient to carry during operation.

The main electrolysis cell of the design of the electrolyzer is made of a can of iron-nickel battery that has expired and should be recycled, so the cost of such an electrolyzer will be significantly lower than that of the closest analogue. In addition, it guarantees high corrosion resistance of the structure, as it is designed for long-term operation in an alkaline electrolyte environment.

Separate electrolysis cells are equipped with outlet pipes, through which explosive gas is discharged into a collection pipe, which is connected to a water seal.

A water lock is a pipe plugged at the bottom and closed by a valve cover at the top. Pipes are welded into the pipe for supplying and discharging explosive gas and for visualizing the liquid level in it. In the upper part of the water seal there is a droplet separator, which can be filled, for example, with plastic balls.

The graphic materials attached to the description show:

figure 1 is a General diagram of the proposed device for flame work;

figure 2 is a drawing of a water seal in the context.

The following symbols are used on graphic materials:

1 - electrolysis cell of the electrolyzer; 2 - prefabricated pipeline; 3 - water seal; 4 - burner; 5 - power supply; 6 - valve cover on the water seal; 7 - pipe outlet gas; 8 - valve body; 9 - valve spring; 10 - indicator of liquid level; 11 - a bubble zone; 12 - base; 13 - pipe inlet of explosive gas; 14 - mesh; 15 - droplet separator; 16 - rubber valve gasket.

Description of the operation of the device.

Pour separate electrolysis cells of electrolyzer 1 (Fig. 1) with a 20% aqueous solution of sodium hydroxide (NaOH) with the addition of 15-20 g of lithium hydroxide (LiOH) per 1 liter of solution. To do this, disconnect the prefabricated pipe 2, connecting the individual cells, unscrew the plugs and, using a funnel, carry out the filling. The filling of the cells is monitored visually. For an electrolyzer, in which ZhN-100 battery banks were used as individual electrolysis cells, the estimated consumption is 1.2 liters per can, for ZhN-45, 0.45 liters, respectively. Screw the plugs back and attach the collection pipe 2 in the reverse order. Then, distilled water is poured into the water trap 3 to the average level of the liquid level indicator (approximately 300 ml) 10 (Fig. 2). Filling is carried out through the inlet of the explosive gas 13. The hydrocarbon compounds used are BR-1 "Galosha" gasoline or its analogue "Nefras" C2-80 / 120 in an amount of 50 ml. Restore the connection between the electrolyzer and the water seal. A pipeline is connected - a hose to the burner 4, the size of the mouthpiece of which is selected depending on the intended type of work (Fig. 1). Preparatory work is completed.

Turn on the power supply 5, set the current corresponding to the selected mouthpiece on the burner. Explosive gas is collected in the upper part of the electrolysis cells 1 of the electrolysis cell and is fed through the collection pipe of water 2 to the inlet of the explosive gas of the hydraulic seal 13 (Fig. 2), passing through the boring zone 11, the gas is saturated with hydrocarbon compound vapors and passing through the separator 15 drops and pipe the gas outlet 7 is supplied to the burner 4. After stabilizing the pressure and purging the system, the gas at the outlet of the burner is ignited.

The proposed design of the device for flame works is much simpler compared to the closest analogue, and the use of spent cans of iron-nickel alkaline batteries as separate cells of the electrolyzer significantly reduces the cost of the entire installation. The electrolyzer is assembled from the desired number of cells, that is, if you use 10 cells of ZhN-100, then the supplied electric power of 2 kW is obviously enough for the operation of the burner with tip No. 2. In this case, it will be necessary to understaff banks with plugs equipped with outlet nozzles. In other words, only a water seal and a power supply will need to be manufactured.

Claims (1)

A device for flame work, containing a burner, a water trap, an electrolyzer for hydrogen and oxygen evolution to produce explosive gas, a power supply unit, a pipeline, characterized in that the electrolyzer is made in the form of a battery consisting of separate series-connected electrolysis cells, the battery poles being connected to the opposite in sign to the poles of the power supply, and as a separate electrolysis cell, a spent and previously discharged can of iron-nickel alkaline acc a emulator, wherein the cells are equipped with outlet pipes for discharging the resulting detonating gas, connected to a pipeline connected to a water seal, in which a water emulsion containing hydrocarbon compounds is used to correct the flame composition, and the water seal is provided with a droplet separator from the gas mixture.

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