A plasma brazing machine

Abstract

The present invention relates to the field of welding, and specifically to a plasma brazing machine: comprising a shell, a conductive head, a negative pole, a nozzle, an airflow vortex device and a water tank, wherein the water tank and the negative pole are arranged in a staggered manner, and the interior of the water tank is divided into two chambers, the upper layer is chamber No. 1, the interior of the chamber No. 1 is filled with water, and the lower layer is chamber No. 2, the chamber No. 2 is filled with a temperature-sensitive medium; an air outlet is provided at the left end of the chamber No. 1, and an air-water separation layer is provided inside the air outlet; the chamber No. 1 and the chamber No. 2 are separated by a movable baffle, and the movable baffle and the water tank are connected by memory metal; a water injection port is provided at the upper end of the water tank and the shell, and a water level alarm is placed inside the water tank. Through the special structure inside the water tank, the water tank is always kept in a high-pressure state without consuming electric energy, which saves electric energy while increasing the overflow rate of water vapor, improving the quality of the plasma beam, and thus improving the welding quality of the workpiece.

Description

Technical Field

[0001] The invention relates to the field of welding, in particular to a plasma brazing machine. Background Art

[0002] The application scope of brazing technology is very wide in production and life. Traditional brazing has low welding temperature, high heat radiation, high welding cost and the risk of explosion. The flame temperature of plasma brazing machine can be adjusted, the welding temperature can reach more than 2000 degrees, the stability is high, and no harmful gases such as carbon monoxide and carbon dioxide are produced during use.

[0003] The cathode head inside the plasma fiber welding machine is connected to the negative pole of the power supply, and the nozzle of the plasma fiber welding machine is connected to the positive pole of the power supply. When the negative head contacts the positive nozzle, an instantaneous short circuit occurs, generating a high-temperature arc, vaporizing water into steam, and the water vapor is ionized to form a plasma beam.

[0004] However, when the plasma fiber welding machine is working, the water vapor inside it must maintain a certain pressure. In the prior art, an air pump is added to the water tank to maintain the water vapor pressure; however, adding an air pump will increase the weight of the welding machine. Not only does it require additional wires inside, making the welding machine inconvenient to hold during use, but adding an air pump also causes a loss of electrical energy.

[0005] In view of this, in order to overcome the above technical problems, the present invention designs a plasma brazing machine to solve the above technical problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is: during the process of welding workpieces, the plasma brazing machine provided by the present invention can keep the water tank in a high-pressure state at all times through the special structure of the water tank, thereby increasing the rate at which water vapor flows out and improving the effect of the airflow vortex device in generating vortices, thereby improving the quality of the generated plasma beam and further improving the quality of welding.

[0007] A plasma brazing machine provided by the present invention comprises a shell, wherein a conductive head is arranged on one side inside the shell, the conductive head is electrically connected to an external power supply, and the conductive head is fixed to a side wall of the shell; the output end of the conductive head is electrically connected to a negative pole, and an end of the negative pole away from the conductive head is connected to a negative pole head; a nozzle is arranged on an end of the negative pole head away from the negative pole, the nozzle is connected to a positive pole of an external power supply, and an ionization chamber is formed with the negative pole head; an airflow vortex device 7 and a water tank are arranged on one side of the negative pole head, respectively, and the airflow vortex device and the water tank are both fixedly connected to the side wall of the shell; the number of the airflow vortex devices is two, a quartz layer is arranged between adjacent airflow vortex devices, one end of the quartz layer is fixedly connected to the negative pole head, and the other end of the quartz layer is close to the conductive head; a side of the airflow vortex device away from the negative pole head is embedded in the water tank, and the heat generated by the high-temperature electric arc is transferred to the water tank through the airflow vortex device;

[0008] The water tank and the negative pole are staggered, and the interior of the water tank is divided into two chambers, the upper layer is chamber No. 1, which is filled with water, and the lower layer is chamber No. 2, which is filled with temperature-sensitive medium; an air outlet is provided at the left end of chamber No. 1, and an air-water separation layer is provided inside the air outlet; chamber No. 1 and chamber No. 2 are separated by a movable baffle, and the movable baffle and the water tank are connected with memory metal; water filling ports are provided at the upper ends of the water tank and the shell, and a water level alarm is placed inside the water tank.

[0009] Preferably, a vertical baffle for extension and retraction is provided on one side of the movable baffle, and an air duct is provided on the side wall of the water tank away from the air outlet, and the air duct connects chamber No. 1 and chamber No. 2; the ends of the vertical baffle that contact the water tank and the movable baffle are all slidably connected.

[0010] Preferably, the air-water separation layer comprises a high temperature resistant sponge and a fan, the high temperature resistant sponge is fixedly connected to the inner wall of the air outlet, a rotating shaft is fixed inside the fan, and one end of the rotating shaft away from the fan is rotatably connected to the air outlet.

[0011] Preferably, at least one airbag is provided on the wall of the first chamber, and the airbag is filled with gas.

[0012] Preferably, the vertical baffle is composed of a cylinder and a telescopic plate, a spring is provided inside the cylinder, the upper side of the spring is fixedly connected to the cylinder, and the lower side of the spring is fixedly connected to the telescopic plate.

[0013] Preferably, the ends of the fan blades are made of rubber material, and the fan blades are in contact with the high temperature resistant sponge when rotating.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The plasma brazing machine provided by the present invention utilizes the characteristics of temperature-sensitive medium and memory metal, and through the cooperation of a movable baffle and a vertical baffle, keeps the water tank in a high-pressure state at all times without consuming electric energy, thereby increasing the overflow rate of water vapor.

[0016] 2. The plasma brazing machine provided by the present invention saves electric energy while increasing the overflow rate of water vapor by utilizing the cooperation of a fan and a high temperature resistant sponge, thereby improving the effect of the air flow vortex device in generating vortices, thereby improving the quality of the plasma beam and further improving the welding quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a front view of the present invention;

[0019] Figure 2 is a rear view of the present invention;

[0020] Figure 3 is a cross-sectional view of the air outlet of the present invention;

[0021] Figure 4 is a cross-sectional view of a vertical baffle of the present invention;

[0022] In the figure: shell 1, conductive head 2, negative pole 3, quartz layer 4, water tank 5, air outlet 6, air flow vortex device 7, negative head 8, ionization chamber 9, nozzle 10, fan 11, high temperature resistant sponge 12, air bag 13, water injection port 14, water level alarm 15, No. 1 chamber 16, vertical baffle 17, air duct 18, memory metal 19, No. 2 chamber 20, movable baffle 21, rotating shaft 22, telescopic plate 23, spring 24, cylinder 25; DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0024] A plasma brazing machine provided by the present invention comprises a shell 1, wherein a conductive head 2 is arranged on one side inside the shell 1, the conductive head 2 is electrically connected to an external power supply, and the conductive head 2 is fixed to the side wall of the shell 1; the output end of the conductive head 2 is electrically connected to a negative pole 3, and the end of the negative pole 3 away from the conductive head 2 is connected to a negative pole head 8; a nozzle 10 is arranged on the end of the negative pole head 8 away from the negative pole 3, and the nozzle 10 is connected to the positive pole of the external power supply, and the nozzle 10 and the negative pole head 8 form an ionization chamber 9; an airflow vortex device 7 and a water tank 5 are respectively arranged on one side of the negative pole head 8, and the airflow vortex device 7 and the water tank 5 are both fixedly connected to the side wall of the shell 1; the number of the airflow vortex devices 7 is two, and a quartz layer 4 is arranged between adjacent airflow vortex devices 7, one end of the quartz layer 4 is fixedly connected to the negative pole head 8, and the other end of the quartz layer 4 is close to the conductive head 2; the side of the airflow vortex device 7 away from the negative pole head 8 is embedded in the water tank 5, and the heat generated by the high-temperature arc is transferred to the water tank 5 through the airflow vortex device 7;

[0025] The water tank 5 is staggered with the negative pole 3, and the interior of the water tank 5 is divided into two chambers, the upper layer is chamber No. 1 16, and the interior of chamber No. 1 16 is filled with water, and the lower layer is chamber No. 2 20, and the chamber No. 2 20 is filled with a temperature-sensitive medium; an air outlet 6 is provided at the left end of chamber No. 1 16, and an air-water separation layer is provided inside the air outlet 6; chamber No. 1 16 and chamber No. 2 20 are separated by a movable baffle 21, and the movable baffle 21 is connected to the water tank 5 by a memory metal 19; a water inlet 14 is provided at the upper end of the water tank 5 and the shell 1, and a water level alarm 15 is placed inside the water tank 5.

[0026] After the plasma brazing machine is powered on, electric energy reaches the cathode head 8 and the nozzle 10 from the external power supply, thereby generating a high-temperature electric arc; an airflow vortex device 7 and a water tank 5 are provided on one side of the cathode head 8, respectively, and the high temperature generated by the electric arc is transmitted to the water tank 5 through the airflow vortex device 7, so that the temperature of the water tank 5 increases, thereby generating water vapor; the increase in temperature will also expand the temperature-sensitive medium in the second chamber 20, and the expansion of the temperature-sensitive medium due to heat will push the movable block to move upward; and as the temperature rises, the memory metal 19 on the movable block is deformed by heat The first chamber 16 is shortened and the movable stopper moves upward, so that the first chamber 16 is always kept in a high pressure state, thereby increasing the speed of water vapor flowing out of the gas outlet 6; after the water vapor flows out from the gas outlet 6, it enters the air flow vortex device 7 at high speed, and after the water vapor forms a vortex in the air flow vortex device 7, it enters the ionization chamber 9 formed by the nozzle 10 and the cathode head 8, in the ionization chamber 9, a part of the water vapor is ionized to generate plasma, and the other part of the water vapor is wrapped in the plasma and ejected from the nozzle 10 to form a high-temperature plasma beam, thereby welding the workpiece.

[0027] In this embodiment, the temperature sensing medium can be gas or liquid. Generally, the expansion coefficient of gas is larger, and the travel of the movable stopper will be relatively larger; the expansion coefficient of liquid is smaller than that of gas, but the state is more stable. In this embodiment, the temperature sensing medium is kerosene. In addition, the temperature sensing medium can also be selected from methanol, xylene, mercury and alcohol with good thermal expansion and contraction coefficients. The freezing point of kerosene is: -47°C, and the boiling point is: 180°C~310°C. Therefore, it is particularly suitable to be used as a temperature sensing medium with a temperature change within -45°C~150°C. The material of the movable baffle 21 should be a material that does not react with kerosene and has a certain mechanical strength. The thermal expansion coefficient of kerosene is 1.81×10 -4 The volume change formula of kerosene affected by temperature is ΔV = V t -V 0 =3V 0 aΔt, the volume change of kerosene in the second chamber 20 is ΔV=πr 2 h deformation, the volume of kerosene in chamber 20 in the initial state is V 0 =πrh;

[0028] It should be noted that in the formula, ΔV represents the volume of kerosene affected by temperature, V 0 Represents the volume of kerosene before it is affected by temperature, V t represents the volume of kerosene affected by temperature, a is the expansion coefficient, Δt is the temperature difference, r is the length of the moving block, and h is the height of the kerosene in the second chamber 20. In this way, the movement of the moving block caused by temperature change can be clearly obtained;

[0029] In this embodiment, the memory metal 19 is installed as follows: the memory metal 19 is first stretched at room temperature, and then one end of the memory metal 19 is fixed to the upper end surface of the movable baffle 21, and the other end is fixed to the top of the inner part of the box. When the water temperature in the water tank 5 rises to 60°C, the memory metal 19 is shortened and tightened;

[0030] The present invention makes the water in the water tank 5 always in a high-pressure state through the cooperation between the memory metal 19 and the temperature-sensitive medium, thereby increasing the rate at which water vapor flows out of the air outlet 6, so that the water vapor flows into the air flow vortex device 7 at a high speed, thereby improving the effect of the air flow vortex device 7 in generating vortices, and can improve the quality of the high-temperature plasma beam ejected from the nozzle 10, thereby improving the welding quality.

[0031] As a specific embodiment of the present invention, a vertical baffle 17 for extension and retraction is provided on one side of the movable baffle 21, and an air duct 18 is provided on the side wall of the water tank 5 away from the air outlet 6, and the air duct 18 connects chamber No. 16 and chamber No. 2 20; the ends of the vertical baffle 17 that contact the water tank 5 and the movable baffle 21 are all slidingly connected, and the sliding connection can be a connection between a slider and a slide groove, but the sliding connection is not limited to this connection.

[0032] When the temperature of the water tank 5 rises, the temperature-sensitive medium expands, and the steam generated by the temperature-sensitive medium when heated reaches the closed space formed by the vertical baffle 17 and the No. 1 chamber 16 through the air duct 18, pushing the vertical baffle 17 to move horizontally, and cooperating with the movable baffle 21 to squeeze the water and water vapor in the No. 1 chamber 16, so that the No. 1 chamber 16 is always maintained in a high-pressure state, increasing the rate of water vapor flowing out of the air outlet 6, thereby further improving the effect of the airflow vortex device 7 on generating vortices, further improving the quality of the plasma beam generated by the ionization chamber 9, and further improving the welding quality.

[0033] As a specific embodiment of the present invention, it is characterized in that: the air-water separation layer includes a high temperature resistant sponge 12 and a fan 11, the high temperature resistant sponge 12 is fixedly connected to the inner wall of the air outlet 6, the fan 11 is fixedly connected to a rotating shaft 22, and the end of the rotating shaft 22 away from the fan 11 is rotatably connected to the air outlet 6.

[0034] After water vapor is generated in chamber No. 16, it reaches the gas-water separation layer and passes through the high temperature resistant sponge 12 and the fan 11 in sequence; the high temperature resistant sponge 12 absorbs the moisture mixed in the water vapor and only allows water vapor to pass through, and the water vapor passing through the high temperature resistant sponge 12 contacts the fan 11, driving the fan 11 to rotate. The rotation of the fan 11 increases the speed of water vapor outflow, cooperates with the airflow vortex device 7, improves the vortex effect generated by the airflow vortex device 7, and further improves the effect of the ionization chamber 9 to generate a plasma beam, thereby further improving the welding quality.

[0035] As a specific implementation of the present invention, it is characterized in that: one or more air bags 13 are arranged on the wall of the first chamber 16, and the air bags 13 are filled with gas.

[0036] As the temperature of the water tank 5 rises, the gas in the airbag 13 on the wall of chamber No. 1 16 also expands due to the heat, causing the airbag 13 to expand as well. The volume of the airbag 13 increases after expansion, and together with the vertical baffle 17 and the movable baffle 21, chamber No. 1 16 is further maintained in a high-pressure state, thereby increasing the rate at which water vapor flows out of the outlet 6, improving the effect of the airflow vortex device 7 in generating vortices, and further improving the effect of the plasma beam generated by the ionization chamber 9, thereby further improving the welding quality.

[0037] As a specific embodiment of the present invention, it is characterized in that: the vertical baffle 17 is composed of a cylinder 25 and a telescopic plate 23, and a spring 24 is provided inside the cylinder 25. The upper side of the spring 24 is fixedly connected to the cylinder 25, and the lower side of the spring 24 is fixedly connected to the telescopic plate 23.

[0038] After the plasma brazing machine completes its working stroke, the temperature in the water tank 5 gradually decreases, and the spring 24 inside the cylinder 25 returns to its original state. While the spring 24 returns to its original state, it pushes the telescopic plate 23 to move downward, and cooperates with the memory metal 19 to move the movable baffle 21 downward, which is convenient for the next use.

[0039] As a specific implementation of the present invention, it is characterized in that the ends of the blades of the fan 11 are made of rubber material, and the blades of the fan 11 are in contact with the high temperature resistant sponge 12 when rotating.

[0040] When water vapor comes out from the air outlet 6, it drives the fan 11 to rotate. The end of the fan blade of the fan 11 is made of rubber. When the fan 11 rotates, the end of the fan blade of the fan 11 moves the high-temperature resistant sponge 12, which is conducive to the rapid outflow of water vapor from the air outlet 6, thereby increasing the rate at which water vapor flows to the air flow vortex device 7, improving the effect of the air flow vortex device 7 to generate vortices, and then improving the effect of the plasma beam generated by the ionization chamber 9, thereby further improving the welding quality.

[0041] The specific workflow is as follows:

[0042] After the plasma brazing machine is powered on, electric energy reaches the negative electrode head 8 and the nozzle 10 from the external power supply, thereby generating a high-temperature electric arc; an airflow vortex device 7 and a water tank 5 are respectively provided on one side of the negative electrode head 8, and the high temperature generated by the electric arc is transmitted to the water tank 5 through the airflow vortex device 7, so that the temperature of the water tank 5 increases, thereby generating water vapor; the increase in temperature will also expand the temperature-sensitive medium in the second chamber 20, and a part of the steam generated by the temperature-sensitive medium when heated will push the movable block to move upward, and the other part will reach the closed space formed by the vertical baffle 17 and the first chamber 16 through the air duct 18, pushing the vertical baffle 17 to move horizontally, and cooperating with the movable baffle 21 to squeeze the water and water vapor in the first chamber 16, so that the first chamber 16 is always maintained in a high-pressure state, increasing the rate of water vapor flowing out of the air outlet 6; and as the temperature rises, the memory metal 19 on the movable block is deformed and shortened by the heat, cooperating with the movable block to move upward.

[0043] As the temperature of the water tank 5 rises, the gas in the airbag 13 on the wall of chamber No. 16 also expands due to the heat, causing the airbag 13 to expand as well. After the expansion, the volume of the airbag 13 increases, and in cooperation with the vertical baffle 17 and the movable baffle 21, the rate at which water vapor flows out of the air outlet 6 is further increased, thereby keeping the interior of chamber No. 16 in a high-pressure state at all times; after the water vapor is generated in chamber No. 16, it will reach the gas-water separation layer, and pass through the high-temperature resistant sponge 12 and the fan 11 in turn; the high-temperature resistant sponge 12 will absorb the moisture mixed in the water vapor and only allow water vapor to pass through; the water vapor after passing through the high-temperature resistant sponge 12 will contact with the fan 11, driving the fan 11 to rotate, and the rotation of the fan 11 increases the speed at which the water vapor flows out, and the end of the fan blades of the fan 11 is made of rubber. While the fan 11 is rotating, the end of the fan blades of the fan 11 moves the high-temperature resistant sponge 12, which is conducive to the rapid outflow of water vapor from the air outlet 6.

[0044] After the water vapor flows out from the air outlet 6, it enters the air flow vortex device 7 at high speed. After the water vapor forms a vortex in the air flow vortex device 7, it enters the ionization chamber 9 formed by the nozzle 10 and the cathode head 8. In the ionization chamber 9, part of the water vapor is ionized to generate plasma, and the other part of the water vapor is wrapped in the plasma and ejected from the nozzle 10 to form a high-temperature plasma beam, thereby welding the workpiece.

[0045] After the plasma brazing machine is finished, the temperature in the water tank 5 gradually decreases, and the spring 24 inside the cylinder 25 returns to its original state. When the spring 24 returns to its original state, it pushes the telescopic plate 23 to move downward, and cooperates with the memory metal 19 to move the movable baffle 21 downward, which is convenient for the next use.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plasma brazing machine, characterized in that: The invention comprises a shell (1), wherein a conductive head (2) is provided on one side of the shell (1), the conductive head (2) is electrically connected to an external power supply, and the conductive head (2) is fixed to the side wall of the shell (1); the output end of the conductive head (2) is electrically connected to a negative pole (3), and the end of the negative pole (3) away from the conductive head (2) is connected to a negative pole head (8); the end of the negative pole head (8) away from the negative pole head (3) is provided with a nozzle (10), the nozzle (10) is connected to the positive pole of the external power supply, and the nozzle (10) and the negative pole head (8) form an ionization chamber (9); the negative pole head (8) An airflow vortex device (7) and a water tank (5) are respectively provided on one side, and the airflow vortex device (7) and the water tank (5) are both fixedly connected to the side wall of the housing (1); the number of the airflow vortex devices (7) is two, and a quartz layer (4) is provided between adjacent airflow vortex devices (7), one end of the quartz layer (4) is fixedly connected to the negative electrode head (8), and the other end of the quartz layer (4) is close to the conductive head (2); the side of the airflow vortex device (7) away from the negative electrode head (8) is embedded in the water tank (5), and the heat generated by the high-temperature arc is transferred to the water tank (5) through the airflow vortex device (7); The water tank (5) and the negative pole (3) are arranged in a staggered manner. The interior of the water tank (5) is divided into two chambers, the upper layer is a No. 1 chamber (16), the interior of the No. 1 chamber (16) is filled with water, and the lower layer is a No. 2 chamber (20), the No. 2 chamber (20) is filled with a temperature-sensitive medium; an air outlet (6) is provided at the left end of the No. 1 chamber (16), and an air-water separation layer is provided inside the air outlet (6); the No. 1 chamber (16) and the No. 2 chamber (20) are separated by a movable baffle (21), and the movable baffle (21) and the water tank (5) are connected by a memory metal (19); a water injection port (14) is provided at the upper end of the water tank (5) and the housing (1), and a water level alarm (15) is placed inside the water tank (5); A vertical baffle (17) for extension and retraction is provided on one side of the movable baffle (21); a side of the water tank (5) away from the air outlet (6) is provided with an air passage (18) on its side wall, and the air passage (18) connects the first chamber (16) and the second chamber (20); the ends of the vertical baffle (17) that contact the water tank (5) and the movable baffle (21) are all in sliding connection; The air-water separation layer comprises a high temperature resistant sponge (12) and a fan (11); the high temperature resistant sponge (12) is fixedly connected to the inner wall of the air outlet (6); a rotating shaft (22) is fixedly connected to the inside of the fan (11); and one end of the rotating shaft (22) away from the fan (11) is rotatably connected to the air outlet (6); A plurality of air bags (13) are provided on the wall of the first chamber (16), and the air bags (13) are filled with gas; The vertical baffle (17) is composed of a cylinder (25) and a telescopic plate (23); a spring (24) is provided inside the cylinder (25); the upper side of the spring (24) is fixedly connected to the cylinder (25); and the lower side of the spring (24) is fixedly connected to the telescopic plate (23); The ends of the blades of the fan (11) are made of rubber, and the blades of the fan (11) are in contact with the high temperature resistant sponge (12) when rotating; After the plasma brazing machine is powered on, electric energy reaches the negative electrode head (8) and the nozzle (10) from the external power supply, thereby generating a high-temperature electric arc; the high temperature generated by the electric arc is transmitted to the water tank (5) through the airflow vortex device (7), so that the temperature of the water tank (5) increases, thereby generating water vapor; the temperature increase of the water tank (5) also causes the temperature-sensitive medium in the second chamber (20) to expand, and a part of the steam generated by the temperature-sensitive medium being heated will push the movable baffle (21) to move upward, and the other part will reach the closed space formed by the vertical baffle (17) and the first chamber (16) through the air passage (18), push the vertical baffle (17) to move horizontally, and cooperate with the movable baffle (21) to squeeze the water and water vapor in the first chamber (16), so that the first chamber (16) is always kept in a high-pressure state; and when the temperature increases, the memory metal (19) on the movable block is deformed and shortened by the heat, and cooperates with the movable block to move upward.

Images