An energy-saving vacuum tube furnace

Abstract

This invention relates to an energy-saving vacuum tube furnace, belonging to the field of tube furnace technology. It includes a shell with a heat-conducting cavity on its inner side. A heating tube is rotatably connected to the inner side of the heat-conducting cavity. An insulation layer and a metal cylinder are also provided on the inner side of the heat-conducting cavity. The insulation layer is distributed along the peripheral wall of the heat-conducting cavity, and the metal cylinder coincides with the central axis of the heating tube. This invention solves the problems of rapid temperature rise but slow cooling of the heating wire during heating, the high energy consumption of the curved outer surface of the heating tube, concentrated heat release, and difficulty in evenly distributing the heating wire on the outer surface of the heating tube, thus hindering even heating of the items inside the tube. In this invention, the insulation chamber of the insulation box allows for the storage and preservation of the heating medium oil, reducing energy consumption for heating and accelerating the heating rate during subsequent use.

Description

Technical Field

[0001] This invention belongs to the field of tube furnace technology, specifically relating to an energy-saving vacuum tube furnace. Background Technology

[0002] Tube furnaces are mainly used in industries such as 3D printing, metallurgy, glass, heat treatment, lithium battery positive and negative electrode materials, new energy, and abrasives. All tube furnaces are high-performance and energy-saving new electric furnaces developed using internationally advanced technology. There are various tube furnace types, including single-tube, double-tube, horizontal, openable, vertical, single-temperature zone, dual-temperature zone, and triple-temperature zone furnaces. They are safe and reliable, easy to operate, have high temperature control accuracy, good heat preservation effect, wide temperature range, high furnace temperature uniformity, multiple temperature zones, and can be equipped with atmospheres and vacuum furnaces.

[0003] When heating with an electric heating wire, the temperature of the heating wire rises rapidly but cannot be cooled quickly. Furthermore, the outer circumference of the heating tube is curved, resulting in extremely high energy consumption of the heating wire. This leads to overly concentrated heat release, and the heating wire is difficult to distribute evenly on the outer circumference of the heating tube, thus making it impossible to evenly heat the items inside the heating tube. Therefore, an energy-saving vacuum tube furnace is proposed. Summary of the Invention

[0004] This invention provides an energy-saving vacuum tube furnace, which aims to solve the problems of rapid temperature rise and slow cooling of the heating wire during heating, the high energy consumption of the heating wire due to the curved outer surface of the heating tube, the overly concentrated heat release, and the difficulty in evenly distributing the heating wire on the outer surface of the heating tube, thus failing to evenly heat the items inside the heating tube.

[0005] This invention provides an energy-saving vacuum tube furnace, including a shell, a heat-conducting cavity formed on the inner side of the shell, a heating tube rotatably connected to the inner side of the heat-conducting cavity, a heat insulation layer and a metal cylinder provided on the inner peripheral wall of the heat-conducting cavity, the heat insulation layer being distributed along the peripheral wall of the heat-conducting cavity, the metal cylinder coinciding with the central axis of the heating tube, and a coil provided on the inner side of the shell, the coil being sleeved on the outer side of the heat insulation layer;

[0006] One end of the heating tube is connected to a blocking post, and one end of the blocking post is provided with a sealing cap. A vent pipe is provided on one side of the sealing cap. A channel is opened on the inner side of the blocking post, and the channel is connected to the vent pipe. The metal cylinder is made of metal alloy. An annular piston is slidably connected to the inner side of the heat conduction cavity. The annular piston is sleeved on the outer circumference of the heating tube. A heat insulation box is provided at the bottom of the shell. A heat insulation component is provided inside the heat insulation box, and the heat insulation component is connected to the heat conduction cavity.

[0007] Furthermore, a sealing groove is provided at each of the two ends inside the housing, and a mating ring is provided at each of the two ends of the heating tube. A sealing ring is sleeved on the outer side of the mating ring, and an inclined surface is provided on the outer edge of the mating ring. The inner side of the sealing ring mates with the inclined surface on the outer side of the mating ring. The mating ring extends into the inner side of the sealing groove, and the sealing ring is located on the inner side of the sealing groove.

[0008] By adopting the above scheme, the sealing ring and mating ring can be combined to make the heat conduction cavity a closed cavity through the airtightness between the heating tube and the shell.

[0009] Furthermore, a rubber sealing ring is provided on the outer edge of the sealing ring, and the rubber sealing ring and the inner wall of the sealing ring are movably connected.

[0010] By adopting the above solution, the rubber sealing ring can improve the fit between the sealing ring and the inner wall of the sealing groove.

[0011] Furthermore, a turntable is provided at one end of the inner side of the heat-conducting cavity, and a plurality of equally spaced, annularly distributed stirring rods are provided on the turntable. The stirring rods pass through an annular piston, and an annular groove is provided on the inner side of the annular piston. A plurality of circumferentially distributed connecting plates are provided on one side of the annular piston, and a stirring ring is provided on the inner side of the annular groove. The stirring rod passes through the stirring ring, and the distance between the end of the stirring rod away from the turntable and the inner wall of the heat-conducting cavity is greater than the thickness of the connecting plate.

[0012] By adopting the above scheme, the stirring rod can be indirectly connected to the annular piston and the turntable, so that the two move together.

[0013] Furthermore, a motor is provided on the inner side of the housing, a drive gear is provided at the output end of the motor, and a transmission gear is provided on the outer side of the turntable, the transmission gear and the drive gear meshing together.

[0014] By adopting the above scheme, the motor drives the turntable to rotate through the drive gear and transmission gear. The turntable can drive the stirring rod to rotate around the central axis of the heating tube. The rotation of the stirring rod can stir the inner cavity of the heat conduction chamber.

[0015] Furthermore, the insulation component includes a heat insulation box, one end of which is provided with a heat insulation chamber, and the inside of the heat insulation box has an insulation cavity, the inner side of which contains the medium oil;

[0016] A heat-insulating piston is slidably connected to the inner side of the heat-insulating cavity. A vacuum connecting pipe is provided on one side of the heat-insulating piston. A linkage piston is fixedly connected to one end of the vacuum connecting pipe. A pressure hole one is opened at one end of the inner cavity of the heat-insulating box. A control cavity is opened at the other end of the heat-insulating box. A linkage piston is slidably connected to the inner side of the control cavity. A pressure hole two is opened at one end of the control cavity. The vacuum connecting pipe passes through the inner side of the heat-insulating box to reach the control cavity and is fixedly connected to the linkage piston. A return spring is provided on the side of the linkage piston away from the vacuum connecting pipe. The return spring is connected to the inner wall of the control cavity. A connecting air pipe is connected to one end of the control cavity. A sealing plate is provided at the end of the connecting air pipe away from the heat-insulating box. The sealing plate extends into the inner cavity of the heating tube.

[0017] The insulation box and the heat-conducting cavity are connected by a pipe. A vacuum channel is provided on the inner side of the vacuum connecting pipe. A connecting rod is provided on the inner side of the vacuum channel. The connecting rod passes through the vacuum channel. One end of the connecting rod is connected to the heat-insulating piston, and the other end of the heat-insulating piston is connected to the linkage piston.

[0018] By adopting the above scheme, the heat insulation component can recover and keep the medium oil in the heat conduction cavity warm after the gas pressure in the heating tube is balanced. During this period, the annular piston moves to clean the inner wall of the heat conduction cavity and the outer wall of the heating tube.

[0019] Furthermore, a vacuum chamber 1 is provided on the outer periphery of the heat insulation box, and a plurality of support frames 1 are provided on the inner side of the vacuum chamber 1. A vacuum chamber 2 is provided on the inner side of the heat insulation piston, and a plurality of support frames 2 are provided on the inner side of the vacuum chamber 2. Both the support frames 1 and the support frames 2 are X-shaped.

[0020] By adopting the above scheme, vacuum chamber one and vacuum chamber one can make it difficult for the insulation chamber to exchange heat with the outside world, thereby maintaining the temperature of the oil in the insulation chamber.

[0021] Furthermore, a gas supply pipe is provided at one end of the housing, and the gas supply pipe is connected to the heat conduction cavity.

[0022] By adopting the above scheme, the gas supply pipe can be matched with the gas pressure of the heat conduction cavity.

[0023] Furthermore, an air bladder is connected to the top of the coil, and a plurality of deoxygenating balls are arranged on the inner side of the air bladder. The deoxygenating balls are covered with air holes, and a deoxygenating agent and a desiccant are arranged on the inner side of the deoxygenating balls. Nitrogen gas is contained on the inner side of the air bladder. The deoxygenating agent includes red phosphorus, and the desiccant includes anhydrous calcium chloride.

[0024] By adopting the above scheme, when nitrogen returns to the inside of the airbag after being heated in the heat-conducting cavity, the oxygen that may be mixed in the nitrogen is also heated. When the oxygen passes through the inside of the deoxygenating ball, it will react with the red phosphorus, thereby removing the oxygen.

[0025] Furthermore, the air supply pipe is also equipped with a receiving box, the airbag is contained in the receiving box, and the inside of the receiving box contains saline solution.

[0026] By adopting the above method, the brine in the containment box can reduce the temperature of the gas inside the airbag.

[0027] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects:

[0028] 1. In this invention, the insulation chamber of the heat insulation box can be used to keep the medium oil warm and store it, so that the energy consumption required for heating can be reduced and the heating speed can be accelerated when it is used next time. During this process, the annular piston moves, so that the nitrogen gas in the vacuum chamber is drawn into the heat conduction chamber. The nitrogen gas can maintain the pressure in the heat conduction chamber and keep it in shape, while the temperature inside the heating tube can be reduced rapidly. The movement of the annular piston can clean the inner wall of the heat conduction chamber and the outer wall of the heating tube.

[0029] 2. In this invention, by using the airbag, when the nitrogen gas returns to the inside of the airbag after being heated by the inner cavity of the heat-conducting cavity, the oxygen that may be mixed in the nitrogen gas is also heated. When the oxygen passes through the inside of the deoxygenating ball, it will react with the red phosphorus, thereby removing the oxygen.

[0030] 3. In this invention, a changing electromagnetic field is generated by a coil to heat the metal cylinder. The metal cylinder transfers heat to the medium oil, and the medium oil evenly transfers the heat of the medium oil to the heating tube, so that the substance inside the heating tube is heated evenly and continuously.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a front cross-sectional view of the present invention;

[0034] Figure 2 For the present invention Figure 1 A magnified schematic diagram of part A in the diagram;

[0035] Figure 3 For the present invention Figure 1 A magnified schematic diagram of part B in the diagram;

[0036] Figure 4 For the present invention Figure 1 A magnified schematic diagram of part C in the diagram;

[0037] Figure 5 This is a schematic diagram showing the positional relationship between the connecting plate and the annular piston of the present invention.

[0038] Reference numerals: Shell—1, Heating tube—2, Sealing cover—3, Vent pipe—4, Blocking column—5, Turntable—6, Motor—7, Coil—8, Stirring rod—9, Insulation layer—10, Metal cylinder—11, Container box—12, Gas supply pipe—13, Air bag—14, Deoxygenating ball—15, Sealing plate—16, Insulation box—17, Insulation box—18, Vacuum chamber one—19, Support frame one—20, Support frame two—21, Insulation piston—22, Vacuum connecting pipe—23, Connecting rod—24, Linking piston—25, Control chamber—26, Return spring—27, Connecting air pipe—28, Heat conducting chamber—29, Sealing groove—30, Sealing ring—31, Matching ring—32, Transmission gear—34, Annular piston—35, Annular groove—36, Stirring ring—37, Connecting plate—38, Driving gear—39. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] like Figure 1-5 As shown, the present invention proposes an energy-saving vacuum tube furnace, including a shell 1. A heat-conducting cavity 29 is provided on the inner side of the shell 1. A heating tube 2 is rotatably connected to the inner side of the heat-conducting cavity 29. A heat insulation layer 10 and a metal cylinder 11 are provided on the inner peripheral wall of the heat-conducting cavity 29. The heat insulation layer 10 is distributed along the peripheral wall of the heat-conducting cavity 29. The metal cylinder 11 coincides with the central axis of the heating tube 2. A coil 8 is provided on the inner side of the shell 1. The coil 8 is sleeved on the outer side of the heat insulation layer 10.

[0041] One end of the heating tube 2 is connected to a blocking post 5, and one end of the blocking post 5 is provided with a sealing cap 3. A vent pipe 4 is provided on one side of the sealing cap 3. A channel is opened on the inner side of the blocking post 5, and the channel is connected to the vent pipe 4. The metal cylinder 11 is made of metal alloy. An annular piston 35 is slidably connected to the inner side of the heat conduction cavity 29. The annular piston 35 is sleeved on the outer circumferential surface of the heating tube 2. A heat preservation box 17 is provided at the bottom of the shell 1. A heat preservation component is provided on the inner side of the heat preservation box 17, and the heat preservation component is connected to the heat conduction cavity 29.

[0042] A sealing groove 30 is provided at each of the two ends of the housing 1. A mating ring 32 is provided at each of the two ends of the heating tube 2. A sealing ring 31 is sleeved on the outer side of the mating ring 32. An inclined surface is provided on the outer edge of the mating ring 32. The inner side of the sealing ring 31 is engaged with the inclined surface on the outer side of the mating ring 32. The mating ring 32 extends into the inner side of the sealing groove 30. The sealing ring 31 is located in the inner side of the sealing groove 30.

[0043] The sealing ring 31 and the mating ring 32 work together to make the heat-conducting cavity 29 a closed cavity by ensuring the airtightness between the heating tube 2 and the shell 1.

[0044] The outer edge of the sealing ring 31 is provided with a rubber sealing ring, and the rubber sealing ring and the inner wall of the sealing ring 31 are movably connected.

[0045] The rubber sealing ring can improve the fit between the sealing ring 31 and the inner wall of the sealing groove 30.

[0046] A turntable 6 is provided at one end of the inner side of the heat conduction cavity 29. Several equally spaced, annularly distributed stirring rods 9 are provided on the turntable 6. The stirring rods 9 pass through an annular piston 35. An annular groove 36 is provided on the inner side of the annular piston 35. Several circumferentially distributed connecting plates 38 are provided on one side of the annular piston 35. A stirring ring 37 is provided on the inner side of the annular groove 36. The stirring rods 9 pass through the stirring ring 37. The distance between the end of the stirring rod 9 away from the turntable 6 and the inner wall of the heat conduction cavity 29 is greater than the thickness of the connecting plate 38.

[0047] The stirring rod 9 can be indirectly connected to the annular piston 35 and the turntable 6, so that the two move together.

[0048] A motor 7 is provided on the inner side of the housing 1, and a drive gear 39 is provided at the output end of the motor 7. A transmission gear 34 is provided on the outer side of the turntable 6, and the transmission gear 34 and the drive gear 39 mesh together.

[0049] The motor 7 drives the turntable 6 to rotate through the drive gear 39 and the transmission gear 34. The turntable 6 can drive the stirring rod 9 to rotate around the central axis of the heating tube 2. The rotation of the stirring rod 9 can stir the inner cavity of the heat conduction cavity 29.

[0050] The insulation component includes an insulation box 18, one end of which is provided with the insulation box 17. The insulation box 18 has an insulation cavity inside, and the inner side of the insulation cavity contains the medium oil.

[0051] A heat-insulating piston 22 is slidably connected to the inner side of the heat-insulating cavity. A vacuum connecting pipe 23 is provided on one side of the heat-insulating piston 22. A linkage piston 25 is fixedly connected to one end of the vacuum connecting pipe 23. A pressure hole 1 is opened at one end of the inner cavity of the heat-insulating box 18. A control cavity 26 is opened at the other end of the heat-insulating box 17. A linkage piston 25 is slidably connected to the inner side of the control cavity 26. A pressure hole 22 is opened at one end of the control cavity 26. The vacuum connecting pipe 23 passes through the inner side of the heat-insulating box 17 to reach the control cavity 26 and is fixedly connected to the linkage piston 25. A return spring 27 is provided on the side of the linkage piston 25 away from the vacuum connecting pipe 23. The return spring 27 is connected to the inner wall of the control cavity 26. A connecting air pipe 28 is connected to one end of the control cavity 26. A sealing plate 16 is provided on the end of the connecting air pipe 28 away from the heat-insulating box 17. The sealing plate 16 extends into the inner cavity of the heating tube 2.

[0052] The heat preservation box 17 and the heat conduction cavity 29 are connected by a pipe. A vacuum channel is provided on the inner side of the vacuum connecting pipe 23. A connecting rod 24 is provided on the inner side of the vacuum channel. The connecting rod 24 passes through the vacuum channel. One end of the connecting rod 24 is connected to the heat insulation piston 22. The other end of the heat insulation piston 22 is connected to the linkage piston 25.

[0053] After the air pressure inside the heating tube 2 is balanced, the heat insulation component can recover and keep the medium oil in the heat conduction cavity 29 warm. During this period, the annular piston 35 moves to clean the inner wall of the heat conduction cavity 29 and the outer wall of the heating tube 2.

[0054] The outer periphery of the heat insulation box 18 is provided with a vacuum chamber 19, and a plurality of support frames 20 are provided on the inner side of the vacuum chamber 19. The inner side of the heat insulation piston 22 is provided with a vacuum chamber 2, and a plurality of support frames 21 are provided on the inner side of the vacuum chamber 2. Both the support frames 20 and the support frames 21 are X-shaped.

[0055] Vacuum chamber 1 and vacuum chamber 19 make it difficult for the insulation chamber to exchange heat with the outside, thereby maintaining the temperature of the oil inside the insulation chamber.

[0056] One end of the housing 1 is provided with an air supply pipe 13, which is connected to the heat conduction cavity 29;

[0057] The air supply pipe 13 can be matched with the air pressure of the heat conduction cavity 29.

[0058] The top of the coil 8 is connected to an air bag 14. Several deoxygenating balls 15 are arranged on the inside of the air bag 14. The deoxygenating balls 15 are covered with air holes. A deoxygenating agent and a desiccant are arranged on the inside of the deoxygenating balls 15. The inside of the air bag 14 contains nitrogen gas. The deoxygenating agent includes red phosphorus, and the desiccant includes anhydrous calcium chloride.

[0059] When nitrogen gas is heated in the inner cavity of the heat-conducting cavity 29 and returns to the inside of the airbag 14, the oxygen that may be mixed in with the nitrogen gas is also heated. When the oxygen passes through the inside of the deoxygenating ball 15, it will react with the red phosphorus and be removed.

[0060] The air supply pipe 13 is also provided with a receiving box 12, the airbag 14 is housed in the receiving box 12, and the inside of the receiving box 12 contains salt water;

[0061] The brine in the containment box 12 can lower the temperature of the gas in the airbag 14.

[0062] The specific implementation method is as follows: the vent pipe 4 is connected to a vacuum pumping device, such as a vacuum machine. The vacuum pumping device extracts the internal chamber of the heating tube 2 through the vent pipe 4, thereby reducing the air pressure. During this process, the gas in the control chamber 26 is also extracted through the sealing plate 16. Under the action of atmospheric pressure, the linkage piston 25 is pushed, and the linkage piston 25 compresses the return spring 27 to move. The linkage piston 25 pulls the heat insulation piston 22 to move through the connecting rod 24 and the vacuum connecting pipe 23. The heat insulation piston 22 squeezes the medium oil in the heat insulation chamber of the heat insulation box 18 into the heat conduction chamber 29. The medium oil pushes the annular piston 35 to move in the heat conduction chamber 29 until the annular piston 35 reaches the end of the heat conduction chamber 29 near the receiving box 12.

[0063] Nitrogen gas in the heat-conducting cavity 29 is discharged into the airbag 14 through one end near the container box 12. The direct coil 8 generates a changing electromagnetic field, which heats the metal cylinder 11. The metal cylinder 11 transfers heat to the medium oil, and the medium oil evenly transfers the heat of the medium oil to the heating tube 2, so that the material in the heating tube 2 is heated evenly and continuously. When the nitrogen gas returns to the inside of the airbag 14 after being heated in the heat-conducting cavity 29, the oxygen gas that may be mixed in the nitrogen gas is also heated. When the oxygen gas passes through the inside of the deoxygenating ball 15, it will react with the red phosphorus and be removed.

[0064] After the items in the heating tube 2 have been heated, gas is injected into the heating tube 2 to restore the gas pressure inside the heating tube 2 to normal. The return spring 27 releases its elastic potential energy, pushing the linkage piston 25 to move the heat insulation piston 22. During the movement of the heat insulation piston 22, the medium oil with a certain amount of heat in the heat conduction chamber 29 will be drawn into the heat insulation chamber of the heat insulation box 18 for heat preservation and storage. When used next time, it can reduce the energy consumption required for heating and speed up the heating rate. During this period, the annular piston 35 moves, so that the nitrogen in the vacuum chamber 19 is drawn into the heat conduction chamber 29. The nitrogen can maintain the pressure inside the heat conduction chamber 29 and keep it in shape.

[0065] The motor 7 drives the turntable 6 to rotate via the drive gear 39 and the transmission gear 34, which in turn drives the stirring rod 9 to rotate in the heat-conducting cavity 29. The stirring rod 9 stirs the medium oil in the heat-conducting cavity 29, causing the medium oil to flow and thus making the temperature of the various components of the medium oil tend to be uniform.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving vacuum tube furnace, comprising a shell (1), characterized in that, A heat-conducting cavity (29) is provided on the inner side of the housing (1). A heating tube (2) is rotatably connected to the inner side of the heat-conducting cavity (29). A heat insulation layer (10) and a metal cylinder (11) are provided on the inner peripheral wall of the heat-conducting cavity (29). The metal cylinder (11) coincides with the central axis of the heating tube (2). A coil (8) is provided on the inner side of the housing (1). The coil (8) is sleeved on the outer side of the heat insulation layer (10). A plug (5) is inserted into one end of the heating tube (2). A sealing cap (3) is provided at one end of the plug (5). A vent pipe (4) is provided on one side of the sealing cap (3). A channel is provided on the inner side of the plunger (5), and the channel is connected to the vent pipe (4). The metal cylinder (11) is made of metal alloy. An annular piston (35) is slidably connected to the inner side of the heat-conducting cavity (29). The annular piston (35) is sleeved on the outer circumference of the heating tube (2). A heat-insulating box (17) is provided at the bottom of the shell (1). A heat-insulating component is provided on the inner side of the heat-insulating box (17). The heat-insulating component is connected to the heat-conducting cavity (29). A sealing groove (30) is provided at each end of the shell (1). A mating ring (32) is provided at each end of the heating tube (2). A sealing ring (31) is fitted onto the outer side of the mating ring (32). The outer edge of the mating ring (32) is provided with an inclined surface. The inner side of the sealing ring (31) is engaged with the inclined surface on the outer side of the mating ring (32). The mating ring (32) extends into the inner side of the sealing groove (30), and the sealing ring (31) is located on the inner side of the sealing groove (30). A rubber sealing ring is provided on the outer edge of the sealing ring (31), and the rubber sealing ring and the inner wall of the sealing ring (31) are movably connected. A turntable (6) is provided at one end of the inner side of the heat conduction cavity (29), and a number of equally spaced, annularly distributed rings are provided on the turntable (6). A stirring rod (9) passes through an annular piston (35). An annular groove (36) is provided on the inner side of the annular piston (35). Several circumferentially distributed connecting plates (38) are provided on one side of the annular piston (35). A stirring ring (37) is provided on the inner side of the annular groove (36). The stirring rod (9) passes through the stirring ring (37). A motor (7) is provided on the inner side of the housing (1). A drive gear (39) is provided at the output end of the motor (7). A transmission gear (34) is provided on the outer side of the turntable (6). The transmission gear (34) and the drive gear (39) mesh.The insulation assembly includes an insulation box (18), with the insulation box (18) located at one end of the insulation box (17). An insulation cavity is formed inside the insulation box (18), and an insulation piston (22) is slidably connected to the inner side of the insulation cavity. A vacuum connecting pipe (23) is provided on one side of the insulation piston (22), and a linkage piston (25) is fixedly connected to one end of the vacuum connecting pipe (23). A pressure port is formed at one end of the inner cavity of the insulation box (18), and a control cavity (26) is formed at the other end of the insulation box (17). A linkage piston (25) is slidably connected to the inner side of the control cavity (26), and a pressure port is formed at one end of the control cavity (26). The vacuum connecting pipe (23) passes through the inner side of the insulation box (17) to reach the control cavity (26) and is fixedly connected to the linkage piston (25). The linkage piston (25) is located away from the vacuum... A return spring (27) is provided on one side of the empty connecting pipe (23). The return spring (27) is connected to the inner wall of the control chamber (26). One end of the control chamber (26) is connected to a connecting air pipe (28). A sealing plate (16) is provided at the end of the connecting air pipe (28) away from the heat preservation box (17). The sealing plate (16) extends into the internal cavity of the heating tube (2). The heat preservation box (17) and the heat conduction chamber (29) are connected by a pipe. A vacuum channel is provided on the inner side of the vacuum connecting pipe (23). A connecting rod (24) is provided on the inner side of the vacuum channel. One end of the connecting rod (24) is connected to the heat insulation piston (22). The other end of the heat insulation piston (22) is connected to the linkage piston (25). A gas supply pipe (13) is provided at one end of the shell (1). The gas supply pipe (13) is connected to the heat conduction chamber (29).

2. The energy-saving vacuum tube furnace according to claim 1, characterized in that: The outer periphery of the heat insulation box (18) is provided with a vacuum chamber one (19), and a number of support frames one (20) are provided on the inner side of the vacuum chamber one (19). The inner side of the heat insulation piston (22) is provided with a vacuum chamber two, and a number of support frames two (21) are provided on the inner side of the vacuum chamber two. Both the support frames one (20) and the support frames two (21) are X-shaped.

3. The energy-saving vacuum tube furnace according to claim 1, characterized in that: The top of the coil (8) is connected to an air bag (14). Several deoxygenating balls (15) are arranged on the inside of the air bag (14). The deoxygenating balls (15) are covered with air holes. A deoxygenating agent and a desiccant are arranged on the inside of the deoxygenating balls (15). Nitrogen gas is contained on the inside of the air bag (14). The deoxygenating agent includes red phosphorus, and the desiccant includes anhydrous calcium chloride.

4. The energy-saving vacuum tube furnace according to claim 3, characterized in that: The air supply pipe (13) is also provided with a receiving box (12), and the airbag (14) is contained in the receiving box (12).

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