JP2017124510A - Small-sized cordless gas welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized cordless gas welder that allows plastic welding without use of electricity from a power receptacle.SOLUTION: A welder has a system consisting of fuel supply means for supplying a combustion catalyst with fuel, and air sending means for sending out the air that is to pass through the combustion catalyst, whereby it is possible to send out the thermal energy generated by the catalytic combustion of combustible liquid gas.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cordless plastic welding machine capable of generating heat by catalytic combustion of a combustible liquefied gas and sending hot air by a blower using a battery as a power source.

  Conventionally, a plastic welding machine that joins joint portions such as a vinyl chloride sheet mainly used for flooring heats a heating wire by electric energy taken from a power outlet, and the heat is provided by the same electric energy. The blower was started and the welding material and the PVC sheet joint were melted and joined together as hot hot air. In addition, there has been a thing in which a conventional catalyst inside with a combustion catalyst inside the nozzle is simply attached to the tip of the crater of the cassette torch after the torch is ignited.

  The following Patent Document 1 describes welding of a PVC material by a direct flame using gas.

JP 7-314557 A JP-A-5-137612

  Conventional welders using liquefied gas have the following drawbacks. Conventionally, the thing which just put the combustion catalyst in the tip of the gas torch does not have a blowing function, and since it does not have a function to blow hot air from the nozzle, the joint part side of the PVC sheet cannot be melted . Usually, since the welding material used for plastic welding of the PVC flooring material is not an adhesive, it is indispensable to melt both the welding material and the joint part, so that it cannot be used practically.

  Furthermore, since ignition cannot be performed with the nozzle attached, the attachment of the nozzle after ignition involves a great danger. Further, since the pressure adjustment in the tank due to the change in the outside air temperature, which is a drawback of the liquefied gas, is not taken into consideration, the gas supply is not stable and cannot be used particularly in a place where the temperature is low.

  Conventional products that use only electricity used plastic welding work to joint parts such as PVC sheets by drawing electricity from the power outlet to the work place with the power cord, but there is a power outlet that can be used at newly built construction sites etc. There is no or a lot of labor to draw in electricity from a few temporary temporary distribution boards. As a solution to the above problem, a storage battery is mentioned. However, in order to melt a polyvinyl chloride material by heat, a large amount of heat energy is required, so that it cannot be used due to the weight and size of the actual storage battery.

  A gas cartridge type hair dryer is known as a product having a combustion catalyst and a blower, but the hair dryer has a structure in which the air generated by the catalytic combustion is mixed with the air generated by the blower and discharged, and the air sent by the blower is discharged. The structure does not pass through the inside of the combustion catalyst. Furthermore, since it does not have a catalyst housing pipe for allowing air to pass into the catalyst, it is difficult to obtain a high temperature that melts the polyvinyl chloride material.

  Although there is a welding machine used for the welding of PVC pipes as in Patent Document 1, there is practically a danger of not only burning directly in the flame and reducing the joining force but also generating toxic hydrogen chloride gas. It is thought that there is also sex. In addition, there is a problem that it cannot be used for a PVC sheet for a flooring material used as a finishing material in which aesthetics are regarded as important. The present invention has been made to eliminate the above drawbacks.

  According to a first aspect of the present invention, there is provided fuel supply means for supplying fuel to the first combustion catalyst, and air for passing through the first combustion catalyst supplied with fuel by the fuel supply means. It is a welding machine which provides the ventilation means.

  According to a second aspect of the present invention, the welding machine further includes a second combustion catalyst, and the blower unit generates thermal energy generated by the second combustion catalyst supplied with fuel by the fuel supply unit. 1 is a welding machine that feeds to one combustion catalyst.

  The invention of claim 3 is a welding machine provided with a nozzle having a V-shaped tip.

  The invention of claim 4 is a welding machine in which a recombustion mixing chamber is provided between the first combustion catalyst and the second combustion catalyst.

  According to the configuration of claim 1, not only the main body can be downsized by using liquefied gas fuel having a high energy density and efficiently generating heat by the combustion catalyst, but also the air generated by the fan using the battery and motor as the power source. By passing it into the combustion catalyst, hot air can be sent out, and it is possible to melt the welding material and joint joint part of the PVC sheet with hot air without using electricity from the power outlet. You are freed from the hassle of drawing in electricity with a cord.

  According to the configuration of claim 2 and claim 4, the propeller is driven by the battery and the motor in order to send air from the rear to the first combustion catalyst provided inside the catalyst housing pipe and sucked into the main body grip. Air is fed into the recombustion mixing chamber through the blower pipe. At this time, the heated gas that could not be completely burned by the second combustion catalyst and the air that was sent in were mixed in the reburning mixing chamber, and the first combustion catalyst in the storage tube was again burned by the catalyst. Therefore, it is possible to obtain a large amount of heat energy even with a small amount of liquefied gas.

  In the previous section, the hot air heated to high temperature by re-combustion with the first combustion catalyst is not only heated by the welding material heating pipe of the nozzle, but also the joint part of the PVC sheet to be welded is melted by the structure that is discharged from the hot air outlet. It becomes a mechanism that can.

  In addition, a decrease in the amount of heat due to the pressure drop in the gas tank due to the low outside air temperature also increases the temperature in the gas tank by installing a heat insulation cover on the outside of the tank and putting a hood in between the heat insulation cover and the tank. Can solve the decrease in heat.

  Temperature adjustment, which is difficult with flame and catalytic combustion, due to combustion of liquefied gas, not only the gas flow rate adjustment lever, but also the distance between the combustion catalyst and the nozzle can be varied by the distance variable band, so that the temperature of the welding material melting tube can be adjusted. Can be adjusted.

  According to the configuration of claim 3, by dividing the nozzle tip into a V-shape, it becomes possible to easily finely adjust the melting temperature even at the joint portion, and it is possible to overcome the temperature adjustment in various places, which is a drawback of the liquefied gas, and to be compact. A plastic welder that does not require a power cord can be realized.

  In addition, by providing a heat insulation cover that puts a hood in the outer part of the gas tank, there is no problem in use in a low temperature place, which is a weak point of liquefied gas.

It is side surface sectional drawing of this invention. It is a perspective view of the present invention. It is side surface sectional drawing of the nozzle of this invention. It is sectional drawing of the nozzle at the time of use of this invention. It is a nozzle tip shape of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that in the present specification and drawings, components having the same reference numerals have substantially the same configuration or function.

  FIG. 1 is a side sectional view showing the configuration of an example of a small cordless gas welding machine according to the present invention. Reference numeral 1 denotes a gas pipe constituting a part of the main body, which connects a gas tank 2 for storing liquefied gas and a crater 3 for ejecting mixed gas.

  The gas pipe 1 is provided with a gas opening / closing lever 4 for shutting off or circulating the gas, and a gas flow rate adjusting lever 5 for adjusting the flow rate of the gas. The lever 5 can roughly adjust the amount of heat.

  An ejector 6 ejects gas from a small hole provided inside, and takes in air from the outside air inlet 7 by the ejector action of the gas to make a mixed gas.

  The ignition button 8 is pressed, and electricity generated by the piezoelectric element unit is sparked by the lead wire 10 in the vicinity of the mixed gas injection port in the crater 3 to generate a flame.

  The state in which the ignition button 8 is pushed in is maintained until the combustion catalyst 13 reaches about 200 ° C. at which the catalytic reaction is started by the flame generated in the previous section. At that time, the shutter 11 made of an elastic body moves in the direction of the arrow (A), and since the outside air inlet 7 and the shutter hole 12 are in the same position, a mixed gas can be generated, so a flame is also generated. to continue.

  When the ignition button 8 is loosened and the ignition button 8 is pushed back by the spring, it moves in the opposite direction of the arrow (A) in the previous section, but at that time, the air is shut off and the flame is extinguished because the air inlet 7 and the shutter hole 12 are displaced. Is done. As a result, the mixed gas is fed into the heated combustion catalyst B. Thereby, catalytic combustion can be started with the nozzle mounted. The welding material 9 and the PVC sheet 27 are not burned by not using a direct flame.

  A battery 19 and a motor 20 are provided inside the main body grip portion 16, and the motor 20 is provided with a propeller 15. When the air blow switch 21 is turned on, electricity flows through the wired cord. When the motor 20 rotates and the propeller 15 is driven, air can be sucked from the intake port 22, and the air can be sent to the recombustion mixing chamber 18 by the blower pipe 17. By connecting a light bulb 23 or the like in parallel to the wiring connecting the battery 19 and the motor 20, the remaining amount of the battery 19 can be confirmed, and at the same time, the work can be easily performed in the dark place by illuminating the work location.

  In order to heat the thermal energy generated by the catalytic reaction of the combustion catalyst 13 more efficiently, the propeller 15 is driven, and the air sucked into the main body grip 16 is sent to the recombustion mixing chamber 18 by the blower pipe 17, The combustion catalyst 13 is mixed again with the gas that has escaped without causing a catalytic reaction. The remixed gas is activated by being combined with heat energy that has already caused a catalytic reaction in the combustion catalyst. As a result, the remixed gas sent to the combustion catalyst 14 efficiently becomes thermal energy without waste, so that a large amount of thermal energy can be obtained with a small amount of gas, and the gas tank provided can be made smaller.

  The air forcedly sent out by the propeller 15 efficiently generates heat energy by passing through the inside of the combustion catalyst storage pipe 35 and becomes hot hot air, passing through the inside of the nozzle 24 provided at the tip of the main body and heating the entire nozzle. If the welding material 9 is inserted into the heating tube 25 provided in the nozzle, the welding material is in a semi-molten state.

  The welding material in a semi-molten state is melted by receiving hot air at the welding material melting portion 30. At this time, by blowing out the hot air from the hot air outlet 26, the seat joint portion 27 to be welded is also melted.

  In adjusting the melting of the joint part, the distance between the hot air outlet 26 serving as the hot air outlet and the joint part 27 is changed. For this purpose, it is necessary to increase the nozzle angle. However, a conventional nozzle with a sharp tip cannot hold the welding material and falls off. As a solution to the above problem, the nozzle tip portion 28 is formed in a bifurcated shape so that it can be pressed from the left and right.

  As another method for adjusting the melting of the welding material and the seat joint portion, the air volume can be adjusted by providing a variable resistor 29 in the wiring portion connecting the motor 20 and the battery 19. In addition, a valve for adjusting the air volume may be provided in the blower pipe 17 or the like. Further, adjusting the amount of air blown into the catalyst storage pipe 35 is also one means. As another air blowing system, it is also effective as one means to store compressed air in the main body grip portion 16 or the like instead of the battery and the motor and discharge it. Further, as another air blowing system, a part of the heat energy may be used and a steam turbine may be used as a substitute for a motor to rotate a propeller or the like to blow air.

  32 is a heat insulating cover provided to cover the gas tank 2. A squirt furnace 33 is inserted between the cover 32 and the gas tank 2. By doing so, the temperature of the liquefied gas in the gas tank can be prevented from decreasing even when the outside air temperature is low. Assuming a hood that generates heat by oxidizing with air, the heat insulating cover 32 is preferably breathable or has a vent.

  As another means for preventing the temperature of the gas tank 2 from decreasing, the heat energy obtained by catalytic combustion is sent as hot air to the gas tank part by a pipe or the like, or a member having good thermal conductivity is used, and the heat energy is transferred to the gas tank. The temperature drop of the gas tank can also be prevented by transmitting to the part.

  On the other hand, as a means for preventing the pressure inside the gas tank from rising too much due to a high outside air temperature, the heat insulating cover 32 or the like is made of a water-absorbing material so as to contain moisture and use the heat of vaporization. Thus, the temperature of the gas tank 2 can be lowered. If the air sent out by the blower systems 15, 19, 20 and the like is used, the temperature of the heat of vaporization can be further lowered.

   The present invention has the above structure. With this structure, plastic welding can be performed without using a power cord. In the present invention, the liquefied gas is described as an example, but the present invention can also be performed in catalytic combustion with liquid fuel.

  The preferred embodiment of the present invention has been described above with reference to the drawings, but the present invention is not limited to the above-described embodiment. That is, it is understood that forms or various modifications that can be conceived by those skilled in the art within the scope of the invention described in the claims belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Gas pipe 2 Gas tank 3 Tinder 4 Gas opening / closing lever 5 Gas flow control lever 6 Ejector 7 Air inlet 8 Ignition button 9 Welding material 10 Lead wire 11 Shutter 12 Shutter hole 13 Combustion catalyst 14 Combustion catalyst 15 Propeller 16 Grip part 17 Air blow pipe 18 Recombustion mixing chamber 19 Battery 20 Motor 21 Blower switch 22 Air inlet 23 Light (bean bulb)
24 Nozzle 25 Welding material heating pipe 26 Hot air outlet 27 Joint part 28 Nozzle V-shaped tip 29 Variable resistor 30 Welding material melting part 31 Distance and direction variable band 32 Heat insulation cover 33 Flash furnace 34 Liquefied gas 35 Combustion catalyst storage pipe A Shutter part B Direction adjustment of combustion catalyst and nozzle C Change in distance due to angle change D Insertion of heat insulation into the body

Claims (4)

A first combustion catalyst;
Fuel supply means for supplying fuel to the first combustion catalyst;
And a blower for sending out air for passing through the first combustion catalyst supplied with fuel by the fuel supply means. The welder further includes a second combustion catalyst,
2. The welding machine according to claim 1, wherein the blowing unit sends out thermal energy generated by the second combustion catalyst supplied with fuel by the fuel supply unit to the first combustion catalyst. 3. The welding machine according to claim 1, wherein the welding machine is provided with a nozzle having a V-shaped tip. The welding machine according to claim 2, wherein a recombustion mixing chamber is provided between the first combustion catalyst and the second combustion catalyst.

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