Gas quenching furnace with small air door structure

Abstract

The invention belongs to the technical field of heat treatment equipment, and particularly relates to a gas quenching furnace with a small air door structure, which comprises a heating furnace body, the heating furnace body comprises a heat insulation clamping shell, a heating chamber is arranged in the heat insulation clamping shell, an auxiliary radiator is arranged on the left side of the heating chamber, and a main radiator is arranged on the left side of the inner wall of the heat insulation clamping shell. A closed sleeve shell is arranged on the right side of the inner wall of the heat insulation clamping shell, and a drainage component is arranged on the left side of the inner surface of the heat insulation clamping shell. According to the device, a preset path is provided for circular circulation of gas through a cylinder body consisting of an internal heat-insulating clamping shell and a heat-insulating inner cylinder, so that the gas can be accurately introduced into the heat-insulating inner cylinder to perform gas quenching work on a heated workpiece without being guided by an air guide pipe in the circular flowing process; the air circulation system is not provided with an air guide pipe on the basis of the original structure, so that the structure becomes simple, the space utilization rate is improved, and the overall weight of the device is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of heat treatment equipment, in particular to a gas quenching furnace with a small air door structure. Background Art

[0002] Vacuum gas quenching furnace is a heat treatment technology in a vacuum environment, which has high requirements for furnace temperature uniformity and cooling efficiency during the heating and cooling processes. Its working principle is to put the workpiece to be processed into the heating chamber of the furnace for heating. When the temperature reaches the set value, cooling gas is added into the furnace body, and then the air-cooled motor is used to circulate the gas in the furnace body to take away the heat, so as to achieve the effect of cooling and improve the performance of the workpiece.

[0003] In existing gas quenching furnaces, the air circulation system usually uses air ducts to connect the air nozzles to ensure that the airflow can be stably transported to the inside of the heating tube to achieve the air intake effect. However, too many air ducts will cause their volume to be larger, which will in turn make the space utilization rate in the furnace body lower. In addition, more ducts will make the internal assembly structure of the gas quenching furnace more complicated, so improvements are needed. Summary of the invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problems is: a gas quenching furnace with a small air door structure, comprising a heating furnace body;

[0005] The heating furnace body comprises a heat-insulating jacket, a heating chamber is arranged inside the heat-insulating jacket, a secondary radiator is arranged on the left side of the heating chamber, a main radiator is arranged on the left side of the inner wall of the heat-insulating jacket, a closed jacket is arranged on the right side of the inner wall of the heat-insulating jacket, a drainage component is arranged on the left side of the inner surface of the heat-insulating jacket, a combined pump body is arranged on the outer side of the heat-insulating jacket, a water-cooled electrode is fixedly connected to the top of the inner cavity of the heat-insulating jacket, and a support frame is fixedly connected to the lower surface of the heat-insulating jacket;

[0006] The heating chamber comprises an insulating inner cylinder, a front insulating plate and a rear insulating plate. The inner cavity of the insulating inner cylinder is provided with a connecting air nozzle through an adapter. When the drainage component is working, the gas will cause the wind shield of the connecting air nozzle to open, so that the cold gas can enter the inside of the insulating inner cylinder to cool the workpiece. However, the gas inside the heating chamber cannot push the wind shield inside the connecting air nozzle in the opposite direction, thereby ensuring that the hot air inside the insulating inner cylinder will not directly flow back to the outside through the connecting air nozzle. The external airflow can enter the inside of the insulating inner cylinder through the connecting air nozzle and the air inlet of the right rear insulating plate. The bottom of the inner wall of the insulating inner cylinder is solid. A processing material bracket is fixedly connected, the inner cavity of the front insulation disk is evenly provided with one-way air outlets, the inner wall of the insulation inner cylinder is provided with a heating element assembly, and the interior of the insulation inner cylinder can be heated by a tube body composed of the heating element assembly, and the workpiece that needs to be gas quenched is fixed by the processing material bracket, and the gas entering the insulation inner cylinder will be discharged outward through the one-way air outlet; the drainage component includes a buckle cover, the middle part of the inner wall of the buckle cover is fixedly connected with a drainage inner frame, the upper and lower sides of the inner cavity of the buckle cover are symmetrically provided with circulation pipes, and a combined fan is provided at the axis of the inner wall of the buckle cover.

[0007] Furthermore, the combined fan includes a sealed shaft cylinder, a rotating motor is fixedly connected to the side of the inner wall axis of the sealed shaft cylinder close to the buckle cover, and a drainage fan blade is fixedly connected to the outer surface of the output shaft of the rotating motor. When the drainage fan blade rotates at high speed, the hot air inside the heat-insulating inner cylinder will be drawn into the drainage inner frame through the one-way air outlet, and then ejected through the oblique nozzle of the main radiator, so that the airflow circulates inside the heating furnace body, the outer surface of the drainage fan blade is fixedly connected to the exhaust sleeve, the outer surface of the rotating motor is provided with a pressure-sensitive component, and the outer surface of the sealed shaft cylinder is fixedly connected to a buffer push cylinder on the side away from the buckle cover.

[0008] Further, the side of the outer surface of the rotating motor away from the buffer push cylinder is fixedly connected to the axis of the inner wall of the sealing axis cylinder, the right end of the sealing axis cylinder is fixedly connected to the axis of the left side of the outer surface of the buckle cover, the outer surface of the exhaust sleeve is fixedly connected to the inner wall of the main radiator, and the outer surface of the main radiator is fixedly connected to the inner wall of the buckle cover. The inner cavity of the main radiator is provided with an oblique nozzle, and the right end of the circulation pipe is fixedly connected to the inner cavity of the main radiator through the oblique nozzle.

[0009] Furthermore, the combined pump body includes a suspension base frame, a diffusion pump is fixedly connected to the top of the suspension base frame, a Roots pump is fixedly connected to the left side of the diffusion pump cavity, a flap valve is fixedly connected to the top of the diffusion pump cavity, a mechanical pump is fixedly connected to the back of the diffusion pump cavity, and the front end of the flap valve is fixedly connected to the back of the buckled cover cavity.

[0010] Further, the water-cooled electrode includes an insulating cylinder, a conductive connecting plate is fixedly connected to the middle of the inner cavity of the insulating cylinder, an electrode rod is fixedly connected to the middle of the inner cavity of the conductive connecting plate, the electrode rod is a hollow rod body, the outer part is a conductive metal rod body, but the inner part is a hollow tube structure, which is used for the circulation of water, and the inner and outer tubes are isolated from each other to avoid the problem of power failure and short circuit, the top of the electrode rod is fixedly connected to a water inlet pipe, the upper part of the inner cavity of the electrode rod is fixedly connected to a water outlet pipe, the lower part of the outer surface of the electrode rod is fixedly connected to a flange, and the bottom of the flange is provided with a water-cooled electrode seat. The bottom of the outer surface of the insulating cylinder is fixedly connected to the upper part of the inner cavity of the heat-insulating chuck, the end of the water inlet pipe away from the electrode rod extends to the outside of the insulating cylinder, the end of the water outlet pipe away from the electrode rod extends to the outside of the insulating cylinder, the inner cavity of the flange is fixedly connected to the upper surface of the water-cooled electrode seat by screws, and the bottom end of the water-cooled electrode seat extends to the outside of the insulating cylinder.

[0011] Further, the pressure-sensitive component includes a cluster sleeve, a compression sleeve is fixedly connected to the left side of the outer surface of the cluster sleeve, hollow slide tubes are evenly arranged in the inner cavity of the cluster sleeve, a thrust plate is fixedly connected to the left side of the hollow slide tube, a spring tension plate is arranged at the axis of the inner cavity of the thrust plate, and an anchor plate is fixedly connected to the right end of the spring tension plate. The outer surface of the anchor plate is fixedly connected to the axis of the outer surface of the rotating motor, the right side of the outer surface of the spring tension plate is fixedly connected to the left side of the outer surface of the thrust plate, and the left side of the outer surface of the cluster sleeve is mutually squeezed by the inner wall of the sealing shaft cylinder through the compression sleeve.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The device provides a preset path for the circulation of gas through a cylinder composed of an internal heat-insulating jacket and a heat-insulating inner cylinder, so that the gas does not need to be guided by an air duct during the circulation process, and can accurately enter the interior of the heat-insulating inner cylinder to perform gas quenching on the heated workpiece. The gas circulation system does not have an air duct in the original structure, which makes the structure simpler, thereby improving the space utilization and reducing the overall weight of the device.

[0014] 2. The wind nozzle and one-way air outlet of the device are both one-way ventilation components, which can ensure that the circulating gas will not flow back and ensure that the gas can circulate along the preset path, preventing the heat loss inside the heat-insulating inner cylinder under the gas quenching working state and playing a role in heat preservation. When performing ventilation and heat dissipation work, the wind can blow up the wind shield inside the wind nozzle and quickly take away the heat. This structure improves the disadvantage of large heat loss.

[0015] 3. The radiator is improved to use a main and auxiliary radiator structure. The heat exchange area is enlarged, and the effective heat exchange efficiency is improved when the gas flows through, which speeds up the cooling speed. Because the main radiator is located at the outlet of the cooling fan, the gas flow is better, so that the temperature distribution in the furnace is more uniform during cooling.

[0016] 4. The improved water-cooled electrode has its electrode holder embedded in the interlayer of the cylinder. The water in the interlayer takes away the heat from the electrode holder when it passes through the electrode holder, which improves the cooling effect. The water inlet pipe is inserted into the copper electrode, and the heat is taken away by water circulation to keep the electrode cool. Compared with the unimproved cooling effect, the cooling effect has been significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention;

[0018] Figure 2 is a cross-sectional view of the present invention;

[0019] Figure 3 is a cross-sectional view of a heating chamber of the present invention;

[0020] Figure 4 is a cross-sectional view of the drainage component of the present invention;

[0021] Figure 5 is a cross-sectional view of the combined fan of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the combined pump body of the present invention;

[0023] Figure 7 is a cross-sectional view of a water-cooled electrode of the present invention;

[0024] Figure 8 It is a cross-sectional view of the pressure-sensitive component of the present invention.

[0025] In the figure: 1. Heating furnace body; 11. Insulation jacket; 12. Auxiliary radiator; 13. Main radiator; 14. Enclosed jacket; 15. Oblique nozzle; 16. Support frame; 2. Combined pump body; 3. Heating chamber; 4. Water-cooled electrode; 5. Drainage component; 31. Insulation inner cylinder; 32. Front insulation plate; 33. Rear insulation plate; 34. Connecting air nozzle; 35. Processing material support; 36. One-way air outlet; 37. Heating element assembly; 51. Snap cover; 52. Drainage inner frame; 53. Circulation pipe; 6. Combined fan; 61. Sealed Sealing shaft core cylinder; 62, rotating motor; 63, drainage fan blades; 64, exhaust sleeve; 65, buffer push cylinder; 21, suspension chassis; 22, diffusion pump; 23, Roots pump; 24, mechanical pump; 25, flap valve; 41, insulating cylinder; 42, conductive connecting plate; 43, electrode rod; 44, water inlet pipe; 45, water outlet pipe; 46, flange; 47, water-cooled electrode seat; 7, pressure-sensitive component; 71, cluster sliding sleeve; 72, compression sleeve; 73, hollow sliding tube; 74, thrust plate; 75, spring tension plate; 76, anchor plate. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0027] Example 1, please refer to Figure 1-Figure 5 , the present invention provides a technical solution: a gas quenching furnace with a small air door structure, comprising a heating furnace body 1;

[0028] The heating furnace body 1 comprises a heat-insulating jacket 11, a heating chamber 3 is arranged inside the heat-insulating jacket 11, a secondary radiator 12 is arranged on the left side of the heating chamber 3, a main radiator 13 is arranged on the left side of the inner wall of the heat-insulating jacket 11, a closed jacket 14 is arranged on the right side of the inner wall of the heat-insulating jacket 11, a drainage component 5 is arranged on the left side of the inner surface of the heat-insulating jacket 11, a combined pump body 2 is arranged on the outer side of the heat-insulating jacket 11, a water-cooled electrode 4 is fixedly connected to the top of the inner cavity of the heat-insulating jacket 11, and a support frame 16 is fixedly connected to the lower surface of the heat-insulating jacket 11;

[0029] The heating chamber 3 includes an insulating inner cylinder 31, a front insulating plate 32 and a rear insulating plate 33. The inner cavity of the insulating inner cylinder 31 is provided with a connecting air nozzle 34 through an adapter. When the flow guide component 5 is working, the gas will open the wind shield of the connecting air nozzle 34, so that the cold gas can enter the insulating inner cylinder 31 to cool the workpiece. However, the gas inside the heating chamber 3 cannot push the wind shield inside the connecting air nozzle 34 in the opposite direction, thereby ensuring that the hot air inside the insulating inner cylinder 31 will not directly flow back to the outside through the connecting air nozzle 34. The external airflow can enter the interior of the insulating inner cylinder 31 through the connecting air nozzle 34 and the air inlet of the right rear insulating plate 33. The bottom of the inner wall of the insulating inner cylinder 31 is solid. A processing material bracket 35 is fixedly connected, and the inner cavity of the front insulation disk 32 is evenly provided with one-way air outlets 36. The inner wall of the insulation inner cylinder 31 is provided with a heating element assembly 37. The tube body composed of the heating element assembly 37 can heat the inside of the insulation inner cylinder 31. The workpiece that needs to be gas quenched is fixed by the processing material bracket 35, and the gas entering the insulation inner cylinder 31 will be discharged outward through the one-way air outlet 36; the drainage component 5 includes a buckled cover 51, and the middle part of the inner wall of the buckled cover 51 is fixedly connected with a drainage inner frame 52, and the upper and lower sides of the inner cavity of the buckled cover 51 are symmetrically provided with circulation pipes 53, and the axis of the inner wall of the buckled cover 51 is provided with a combined fan 6.

[0030] The combined fan 6 includes a sealed shaft cylinder 61, and a rotating motor 62 is fixedly connected to one side of the inner wall axis of the sealed shaft cylinder 61 near the buckled cover 51, and a guide fan blade 63 is fixedly connected to the outer surface of the output shaft of the rotating motor 62. When the guide fan blade 63 rotates at a high speed, the hot air inside the heat-insulating inner cylinder 31 will be drawn into the guide inner frame 52 through the one-way air outlet 36, and then ejected through the oblique nozzle 15 of the main radiator 13, so that the airflow circulates inside the heating furnace body 1, and the outer surface of the guide fan blade 63 is fixedly connected to the exhaust sleeve 64, and the outer surface of the rotating motor 62 is provided with a pressure-sensitive component 7, and the outer surface of the sealed shaft cylinder 61 is fixedly connected to a buffer push cylinder 65 on the side away from the buckled cover 51.

[0031] The side of the outer surface of the rotating motor 62 away from the buffer push cylinder 65 is fixedly connected to the axis of the inner wall of the sealing axis cylinder 61, the right end of the sealing axis cylinder 61 is fixedly connected to the axis of the left side of the outer surface of the buckle cover 51, the outer surface of the exhaust sleeve 64 is fixedly connected to the inner wall of the main radiator 13, and the outer surface of the main radiator 13 is fixedly connected to the inner wall of the buckle cover 51. The inner cavity of the main radiator 13 is provided with an oblique nozzle 15, the right end of the circulation pipe 53 is fixedly connected to the inner cavity of the main radiator 13 through the oblique nozzle 15, and the right side of the outer surface of the drainage inner frame 52 is fixedly connected to the left side of the outer surface of the insulation inner cylinder 31 through the front insulation plate 32.

[0032] When the combined pump body 2 provides power, the external cold air will enter the insulating shell 11, then flow from left to right, enter the insulating inner cylinder 31 through the connecting air nozzle 34 and the rear insulating plate 33 on the right side, heat the environment of the internal gas quenching workpiece through the rear insulating plate 33 and the front insulating plate 32, and then supplement heat through the processing material support 35 at the bottom.

[0033] When the device is working, the rotating motor 62 will drive the drainage blades 63 to rotate at high speed, and then the drainage blades 63 will draw out the gas inside the insulating inner tube 31 through the one-way air outlet 36. The gas enters the exhaust sleeve 64 through the guidance of the drainage inner frame 52, and enters the oblique nozzle 15 of the main heater through the mesh of the exhaust sleeve 64, and then continues to flow back to the interior of the heating furnace body 1, realizing the internal circulation of the air flow inside the heating furnace body 1. After the gas quenching work is completed, when the gas passes through the auxiliary radiator 12 and the main radiator 13, it will take out the heat inside the insulating inner tube 31 for cooling work, forming a cycle, so that the heat dissipation efficiency of the air cooling system is improved.

[0034] Example 2, please refer to Figure 1-Figure 8 The present invention provides a technical solution: on the basis of the first embodiment, the combined pump body 2 includes a suspension base frame 21, a diffusion pump 22 is fixedly connected to the top of the suspension base frame 21, a Roots pump 23 is fixedly connected to the left side of the inner cavity of the diffusion pump 22, a flap valve 25 is fixedly connected to the top of the inner cavity of the diffusion pump 22, a mechanical pump 24 is fixedly connected to the back of the inner cavity of the diffusion pump 22, and the front end of the flap valve 25 is fixedly connected to the back of the inner cavity of the buckled cover 51.

[0035] The water-cooled electrode 4 includes an insulating tube 41, a conductive connecting plate 42 is fixedly connected to the middle of the inner cavity of the insulating tube 41, an electrode rod 43 is fixedly connected to the middle of the inner cavity of the conductive connecting plate 42, the electrode rod 43 is a hollow rod body, the outer part is a conductive metal rod body, but the inner part is a hollow tube structure, which is used for the circulation of water. The inner and outer tubes are isolated from each other to avoid power failure and short circuit problems. The top of the electrode rod 43 is fixedly connected to a water inlet pipe 44, the upper part of the inner cavity of the electrode rod 43 is fixedly connected to a water outlet pipe 45, the lower part of the outer surface of the electrode rod 43 is fixedly connected to a flange 46, and a water-cooled electrode seat 47 is provided at the bottom of the flange 46. The bottom of the outer surface of the insulating tube 41 is fixedly connected to the upper part of the inner cavity of the insulating shell 11, the end of the water inlet pipe 44 away from the electrode rod 43 extends to the outside of the insulating tube 41, the end of the water outlet pipe 45 away from the electrode rod 43 extends to the outside of the insulating tube 41, the inner cavity of the flange 46 is fixedly connected to the upper surface of the water-cooled electrode seat 47 by screws, and the bottom end of the water-cooled electrode seat 47 extends to the outside of the insulating tube 41.

[0036] The pressure-sensing component 7 includes a clustering sleeve 71, a compression sleeve 72 is fixedly connected to the left side of the outer surface of the clustering sleeve 71, hollow slide tubes 73 are evenly arranged in the inner cavity of the clustering sleeve 71, a thrust plate 74 is fixedly connected to the left side of the hollow slide tube 73, a spring tension plate 75 is arranged at the axis of the inner cavity of the thrust plate 74, and an anchor plate 76 is fixedly connected to the right end of the spring tension plate 75. The outer surface of the anchor plate 76 is fixedly connected to the axis of the outer surface of the rotating motor 62, the right side of the outer surface of the spring tension plate 75 is fixedly connected to the left side of the outer surface of the thrust plate 74, and the left side of the outer surface of the clustering sleeve 71 is mutually squeezed with the inner wall of the sealing shaft core cylinder 61 through the compression sleeve 72.

[0037] The water circulation inside the water-cooled electrode 4 is as follows: cold water is introduced into the inner cavity of the electrode rod 43 through the water inlet pipe 44, and the water body circulates back to the water outlet pipe 45 and is sprayed outward, so as to quickly cool down the heat-conducting electrode rod 43. The water-cooled electrode seat 47 is embedded in the heat-insulating sandwich shell 11, and the water flow in the sandwich passes through the water-cooled electrode seat 47 to absorb heat to achieve the cooling effect.

[0038] After the gas is guided to the interior of the exhaust sleeve 64, due to the fixed diameter of the oblique nozzle 15, when the power of the combined fan 6 is large, the gas inside the exhaust sleeve 64 is difficult to discharge, resulting in an increase in the internal pressure. At this time, the clustering sleeve 71 will push the hollow sliding tube 73 to the left under the action of pressure, expanding the internal volume of the sealing axis cylinder 61. At this time, the compression sleeve 72 is squeezed, and when the clustering sleeve 71 squeezes the thrust plate 74 to the left through the hollow sliding tube 73, the thrust plate 74 will push the spring tension plate 75 to the left, but the anchor plate 76 on the right side always remains in a fixed state with the rotating motor 62, so the spring at the axis of the spring tension plate 75 is stretched. At this time, the change in the internal pressure of the sealing axis cylinder 61 is judged according to the tension applied to the spring tension plate 75, and then the circulation pipe 53 is used to timely reduce the pressure to prevent the internal pressure of the heating furnace body 1 from being too high and bursting and being damaged.

[0039] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A gas quenching furnace with a small air door structure, comprising a heating furnace body (1), characterized in that: The heating furnace body (1) comprises a heat-insulating jacket (11), a heating chamber (3) is arranged inside the heat-insulating jacket (11), an auxiliary radiator (12) is arranged on the left side of the heating chamber (3), a main radiator (13) is arranged on the left side of the inner wall of the heat-insulating jacket (11), a closed jacket (14) is arranged on the right side of the inner wall of the heat-insulating jacket (11), a drainage component (5) is arranged on the left side of the inner surface of the heat-insulating jacket (11), a combined pump body (2) is arranged on the outside of the heat-insulating jacket (11), a water-cooled electrode (4) is fixedly connected to the top of the inner cavity of the heat-insulating jacket (11), and a support frame (16) is fixedly connected to the lower surface of the heat-insulating jacket (11); The heating chamber (3) comprises an insulating inner cylinder (31), a front insulating plate (32) and a rear insulating plate (33); the inner cavity of the insulating inner cylinder (31) is provided with a connecting air nozzle (34) through an adapter; the bottom of the inner wall of the insulating inner cylinder (31) is fixedly connected with a processing material bracket (35); the inner cavity of the front insulating plate (32) is evenly provided with one-way air outlets (36); and the inner wall of the insulating inner cylinder (31) is provided with a heating element assembly (37); The drainage component (5) comprises a buckled cover (51), a drainage inner frame (52) is fixedly connected to the middle of the inner cavity of the buckled cover (51), circulation pipes (53) are symmetrically arranged on the upper and lower sides of the inner cavity of the buckled cover (51), and a combined fan (6) is arranged at the axis of the inner wall of the buckled cover (51).

2. The gas quenching furnace with a small air door structure according to claim 1, characterized in that: The combined fan (6) comprises a sealing shaft core cylinder (61), a rotating motor (62) is fixedly connected to the side of the inner wall of the sealing shaft core cylinder (61) close to the buckle cover (51), a flow guide blade (63) is fixedly connected to the outer surface of the output shaft of the rotating motor (62), an exhaust sleeve (64) is fixedly connected to the outer surface of the flow guide blade (63), a pressure sensing component (7) is arranged on the outer surface of the rotating motor (62), and a buffer push cylinder (65) is fixedly connected to the side of the outer surface of the sealing shaft core cylinder (61) away from the buckle cover (51).

3. The gas quenching furnace with a small air door structure according to claim 2, characterized in that: The side of the outer surface of the rotating motor (62) away from the buffer push cylinder (65) is fixedly connected to the axis center of the inner wall of the sealing shaft cylinder (61), the right end of the sealing shaft cylinder (61) is fixedly connected to the axis center of the left side of the outer surface of the buckle cover (51), the outer surface of the exhaust sleeve (64) is fixedly connected to the inner wall of the main radiator (13), and the outer surface of the main radiator (13) is fixedly connected to the inner wall of the buckle cover (51).

4. The gas quenching furnace with a small air door structure according to claim 3, characterized in that: The inner cavity of the main radiator (13) is provided with an oblique nozzle (15), and the right end of the circulation pipe (53) is fixedly connected to the inner cavity of the main radiator (13) through the oblique nozzle (15).

5. The gas quenching furnace with a small air door structure according to claim 1, characterized in that: The combined pump body (2) comprises a suspension base frame (21), the top of the suspension base frame (21) is fixedly connected to a diffusion pump (22), the left side of the inner cavity of the diffusion pump (22) is fixedly connected to a Roots pump (23), the top of the inner cavity of the diffusion pump (22) is fixedly connected to a flap valve (25), the back of the inner cavity of the diffusion pump (22) is fixedly connected to a mechanical pump (24), and the front end of the flap valve (25) is fixedly connected to the back of the inner cavity of the buckled cover (51).

6. The gas quenching furnace with a small air door structure according to claim 1, characterized in that: The water-cooled electrode (4) comprises an insulating tube (41), a conductive connecting plate (42) is fixedly connected to the middle of the inner cavity of the insulating tube (41), an electrode rod (43) is fixedly connected to the middle of the inner cavity of the conductive connecting plate (42), a water inlet pipe (44) is fixedly connected to the top of the electrode rod (43), a water outlet pipe (45) is fixedly connected to the upper part of the inner cavity of the electrode rod (43), a flange (46) is fixedly connected to the lower part of the outer surface of the electrode rod (43), and a water-cooled electrode seat (47) is arranged at the bottom of the flange (46).

7. The gas quenching furnace with a small air door structure according to claim 6, characterized in that: The bottom of the outer surface of the insulating cylinder (41) is fixedly connected to the upper part of the inner cavity of the heat-insulating jacket (11); one end of the water inlet pipe (44) away from the electrode rod (43) extends to the outside of the insulating cylinder (41); one end of the water outlet pipe (45) away from the electrode rod (43) extends to the outside of the insulating cylinder (41); the inner cavity of the flange (46) is fixedly connected to the upper surface of the water-cooled electrode seat (47) by screws; and the bottom end of the water-cooled electrode seat (47) extends to the outside of the insulating cylinder (41).

8. The gas quenching furnace with a small air door structure according to claim 2, characterized in that: The pressure-sensitive component (7) comprises a clustering sleeve (71), a compression sleeve (72) is fixedly connected to the left side of the outer surface of the clustering sleeve (71), the inner cavity of the clustering sleeve (71) is evenly provided with hollow sliding tubes (73), the left side of the hollow sliding tube (73) is fixedly connected to a thrust plate (74), a spring tension plate (75) is provided at the axis center of the inner cavity of the thrust plate (74), and the right end of the spring tension plate (75) is fixedly connected to an anchor plate (76).

9. The gas quenching furnace with a small air door structure according to claim 8, characterized in that: The outer surface of the anchor plate (76) is fixedly connected to the axis of the outer surface of the rotating motor (62), the right side of the outer surface of the spring tension plate (75) is fixedly connected to the left side of the outer surface of the thrust plate (74), and the left side of the outer surface of the clustering sleeve (71) is squeezed against the inner wall of the sealing shaft core cylinder (61) through the compression sleeve (72).

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