Air internal circulation cooling device for introducing protective gas

Abstract

The application relates to the field of pipeline inner wall cooling devices, in particular to an air inner circulation cooling device for guiding in protective gas, which comprises an outer shell, a top cover fixedly connected to the left end of the outer shell through bolts, and a flange connected to one end of a pipeline to be cooled at the right end of the outer shell; an air inlet pipe fixedly communicated on the outer side wall close to the left end of the outer shell, which is used for guiding in cold gas; the outer chamber, the inner chamber and the U-shaped air guide pipe are arranged, the hot gas in the pipeline is sucked into the outer chamber through the fan blade, mixed with the cold gas, then enters the pipeline through the inner chamber, and finally is transported into the outer chamber through the U-shaped air guide pipe, so that the hot gas in the pipeline is continuously circulated in the pipeline, thereby being beneficial to fully utilizing the inert gas, saving resources, and being beneficial to fully contacting the cold gas with the inner wall of the pipeline, and improving the cooling effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline inner wall cooling device, especially to an air internal circulation cooling device for guiding protective gas. BACKGROUND

[0002] When working with a pipeline, the temperature inside the pipe will rise, in order to prevent the pipe from being damaged, the inside of the pipeline needs to be cooled in time, the existing cooling is often to pass cold gas into the pipe to cool the pipe, and in order to prevent the pipe from being oxidized, the cold gas is inert gas.

[0003] However, the prior art has the following disadvantages: since both ends of the pipe are flowing, when the cold inert gas is passed into one end of the pipe, the cold inert gas will flow out of the other end of the pipe, so that the cold inert gas is difficult to fully contact with the inner wall of the pipe, not only a large amount of inert gas needs to be continuously passed in, which causes waste, but also is not conducive to fully cooling the inner wall of the pipe. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art, and provide an air internal circulation cooling device for guiding protective gas.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an air internal circulation cooling device for guiding protective gas, comprising:

[0006] A shell, a top cover is fixedly connected to the left end of the shell through bolts, and the right end of the shell is connected to one end of a pipe to be cooled through a flange;

[0007] An air inlet pipe is fixedly connected to the outer side wall near the left end of the shell, and the air inlet pipe is used to pass in cold gas;

[0008] A U-shaped air guide pipe, one end of the U-shaped air guide pipe is fixedly connected to the side wall of the right end of the shell, and the other end of the U-shaped air guide pipe is connected to the other end of the pipe to be cooled through a flange;

[0009] An inner shell is fixedly connected in the shell, and an outer chamber is left between the inner shell and the shell;

[0010] An inner container is fixedly connected in the inner shell, and an inner chamber is left between the inner container and the inner shell;

[0011] An annular sealing ring is fixedly connected to the right end of the inner shell;

[0012] A motor is connected to the left end of the inner container through a connecting part, and a fan blade is fixedly connected to the left end of the output shaft of the motor;

[0013] When the fan blade rotates, the U-shaped air duct sucks the hot gas in the pipe to be cooled into the outer chamber, and the hot gas enters the inner chamber after mixing with the cold gas, so that the temperature of the hot gas is reduced, and then reenters the pipe to be cooled to cool the pipe to be cooled.

[0014] Preferably, further comprising:

[0015] A temperature sensor fixedly connected in the U-shaped air duct for detecting the temperature of the hot gas;

[0016] A first annular connecting plate slidingly inserted into the inner wall of the right end of the inner shell, and the annular sealing ring is fixedly connected to the end of the first annular connecting plate;

[0017] A pushing assembly for pushing the first annular connecting plate to move towards the pipe to be cooled;

[0018] When the temperature sensor detects that the temperature of the hot gas exceeds a specified value, the pushing assembly is started to move the first annular connecting plate towards the pipe to be cooled, thereby increasing the area of the outer chamber and dispersing the hot gas to protect the right end of the outer shell from overheating.

[0019] Preferably, further comprising:

[0020] An annular mounting plate fixedly connected to the inner wall near the right end of the outer shell;

[0021] An annular partition plate fixedly connected to the annular mounting plate, and a plurality of first air inlet grooves are arranged on the surface of the annular partition plate;

[0022] A second annular connecting plate slidingly inserted into the inner wall of the right end of the annular partition plate, and a plurality of second air inlet grooves are arranged on the surface of the second annular connecting plate corresponding to the positions of the first air inlet grooves;

[0023] A plurality of connecting rods fixedly connected to the right end of the second annular connecting plate, and the connecting rods are fixedly connected with the annular sealing ring.

[0024] Preferably, further comprising:

[0025] A spiral conveying blade fixedly connected to the outer wall of the right end of the inner shell.

[0026] Preferably, further comprising:

[0027] A plurality of first air holes arranged on the right end wall of the inner shell along the track of the spiral conveying blade;

[0028] A plurality of second air holes are arranged on the first annular connecting plate away from the first air hole.

[0029] Preferably, the pushing assembly comprises:

[0030] An electric telescopic rod is fixedly connected to the right end of the inner container, and a bracket is fixedly connected to the end of the electric telescopic rod.

[0031] Preferably, the application further comprises:

[0032] A first sealing shell is fixedly connected to the right end of the inner container, a second sealing shell is slidingly inserted into the right end of the first sealing shell, the second sealing shell is fixedly connected to the bracket, and the electric telescopic rod is fixedly connected in the first sealing shell.

[0033] Preferably, the U-shaped air duct comprises a left air pipe and a right air pipe, and the left air pipe and the right air pipe are slidingly inserted.

[0034] Preferably, the cold gas is an inert gas.

[0035] Preferably, the connecting component comprises:

[0036] A base is fixedly connected to the motor, and the base is clamped to the left end of the inner container.

[0037] A top base is rotatably connected to the end of the output shaft of the motor.

[0038] A pressing plate is fixedly connected to the right end of the top cover through a support, and the pressing plate presses the top base to limit the base.

[0039] Compared with the prior art, the application has the following beneficial effects:

[0040] Firstly, the outer chamber, the inner chamber and the U-shaped air duct are arranged, the hot gas in the pipe is sucked into the outer chamber by the fan blade, mixed with the cold gas, then enters the pipe through the inner chamber, and finally is transported to the outer chamber through the U-shaped air duct, so that the hot gas in the pipe is continuously circulated in the pipe, which is beneficial to fully utilize the inert gas, saves resources, and facilitates the cold gas to fully contact the inner wall of the pipe, thereby improving the cooling effect.

[0041] Secondly, the temperature sensor and the first annular connecting plate are arranged, when the temperature sensor detects that the temperature of the hot air exceeds a specified value, the pushing assembly is started, the first annular connecting plate is moved to the pipe to be cooled, the area of the outer chamber is increased, the hot air is more dispersed, the right end of the shell is overheated, when the temperature sensor detects that the temperature of the hot air does not exceed the specified value, the first annular connecting plate is reset through the pushing assembly, the contact area of the cold air and the pipe is increased, and the heat dissipation effect is improved.

[0042] Thirdly, the annular mounting plate and the annular partition plate are arranged, when the temperature sensor detects that the temperature of the hot air exceeds a specified value, the pushing assembly is started, the second annular connecting plate is moved to the pipe under the connection of the connecting rod, the first air inlet groove and the second air inlet groove are misaligned and sealed, the hot air moves along the gap between the annular partition plate and the first annular connecting plate, the hot air is pre-cooled, the temperature of the hot air is reduced, and the right end of the shell is overheated. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the application;

[0044] Figure 2 It is a sectional view of the overall structure of the application;

[0045] Figure 3 It is Figure 2 It is an enlarged view of A in the middle;

[0046] Figure 4 It is a connection diagram of the annular mounting plate, the annular partition plate and the second annular connecting plate in the application;

[0047] Figure 5 It is a connection diagram of the first annular connecting plate and the annular sealing ring in the application;

[0048] Figure 6 It is a connection diagram of the motor and the fan blade in the application;

[0049] Figure 7 It is a connection diagram of the second annular connecting plate and the second air inlet groove in the application;

[0050] Figure 8 It is a connection diagram of the annular partition plate and the first air inlet groove in the application.

[0051] In the figure: shell 1, top cover 2, pressing plate 3, pipe 4, air inlet pipe 5, U-shaped air guide pipe 6, left air pipe 601, right air pipe 602, air outlet hole 603, inner shell 7, outer chamber 8, inner container 9, inner chamber 10, annular sealing ring 11, motor 12, fan blade 13, base 14, top seat 15, temperature sensor 16, first annular connecting plate 17, electric telescopic rod 18, support 19, first sealing shell 20, second sealing shell 21, annular mounting plate 22, annular partition plate 23, first air inlet groove 24, second annular connecting plate 25, second air inlet groove 26, connecting rod 27, spiral conveying blade 28, first air hole 29, second air hole 30. DETAILED DESCRIPTION

[0052] The following description is provided to enable those skilled in the art to practice the present application. The preferred embodiments described below are only examples of the present application and other obvious variants can be conceived by those skilled in the art.

[0053] As Figures 1 to 8 shown in a kind of air in-circulation cooling device of import protection gas, comprising:

[0054] Shell 1, the left end of shell 1 is fixedly connected with top cover 2 by bolt, and the right end of shell 1 is connected with one end of pipe 4 to be cooled by flange;

[0055] Air inlet pipe 5, air inlet pipe 5 is fixedly communicated on the outer side wall close to the left end of shell 1, and air inlet pipe 5 is used to import cold air;

[0056] U-shaped air guide pipe 6, one end of U-shaped air guide pipe 6 is fixedly communicated with the right end side wall of shell 1, and the other end of U-shaped air guide pipe 6 is connected with the other end of pipe 4 to be cooled by flange;

[0057] Inner shell 7, inner shell 7 is fixedly connected in shell 1, and outer chamber 8 is left between inner shell 7 and shell 1;

[0058] Inner container 9, inner container 9 is fixedly connected in the inside of inner shell 7, and inner chamber 10 is left between inner container 9 and inner shell 7;

[0059] Annular sealing ring 11, annular sealing ring 11 is fixedly connected in the right end of inner shell 7;

[0060] Motor 12, motor 12 is connected in the left end of inner container 9 by connecting component, and the left end of output shaft of motor 12 is fixedly connected with fan blade 13;

[0061] When fan blade 13 rotates, U-shaped air guide pipe 6 inhales hot air in pipe 4 to be cooled into outer chamber 8, and hot air and cold air are mixed together to enter inner chamber 10 in the process that hot air enters outer chamber 8, so that the temperature of hot air is reduced, and then reenters into pipe 4 to be cooled to cool pipe 4 to be cooled;

[0062] Specifically, in the prior art, since both ends of the pipe 4 are in flow, when the cold inert gas is introduced from one end of the pipe 4, the cold inert gas will flow out from the other end of the pipe 4, so that the cold inert gas is difficult to fully contact with the inner wall of the pipe 4, which not only needs to continuously introduce a large amount of inert gas, causing waste, but also is not conducive to fully cooling the inner wall of the pipe 4. The technical scheme can solve the above problems. The specific operation is as follows: first, the two ends of the pipe to be cooled 4 are connected with the U-shaped air guide pipe 6 and the shell 1 respectively through the flanges;

[0063] After the connection is completed, the fan blade 13 is rotated by driving the motor 12. When the fan blade 13 rotates, under the action of the negative pressure suction force, the U-shaped air guide pipe 6 sucks the hot gas in the pipe to be cooled 4 into the outer chamber 8. In the process of the hot gas entering the outer chamber 8, the cold gas enters the outer chamber 8 through the air inlet pipe 5, wherein the cold gas is inert gas. Then, the cold gas and the hot gas pass through the fan blade 13, and the cold gas and the hot gas are mixed under the stirring of the fan blade 13, so that the temperature of the hot gas is reduced. The mixed cold gas enters the inner chamber 10 and finally reenters the pipe to be cooled 4 to cool the pipe to be cooled 4.

[0064] And by arranging the annular sealing ring 11, the mixed cold gas can flow from the left end of the pipe to be cooled 4 to the right end of the pipe to be cooled 4, so as to facilitate the cold gas to fully contact with the inner wall of the pipe to be cooled 4.

[0065] When the cold gas flows to the right end of the pipe to be cooled 4, under the action of the negative pressure suction force of the U-shaped air guide pipe 6, the remaining cold gas reenters the inner chamber 10 and is mixed with the newly introduced cold gas, so as to facilitate the full use of the inert gas, save resources, and facilitate the cold gas to fully contact with the inner wall of the pipe 4, thereby improving the cooling effect.

[0066] It should be noted that when the gas pressure in the pipe reaches a predetermined value, the excess gas in the pipe 4 is discharged through the exhaust hole 603.

[0067] As a further embodiment of the present application, the connecting member comprises:

[0068] The base 14 is fixedly connected with the motor 12, and the base 14 is clamped with the left end of the inner container 9.

[0069] The top seat 15 is rotatably connected to the output shaft end of the motor 12.

[0070] The pressing plate 3 is fixedly connected to the right end of the top cover 2 through the support, and the pressing plate 3 presses the top seat 15 to limit the base 14.

[0071] Specifically, by setting the base 14 and the pressing plate 3, when the motor 12 and the fan blade 13 need to be repaired, the top cover 2 is removed, the pressure of the pressing plate 3 on the top base 15 is cancelled, and the motor 12 can be disassembled, thereby facilitating the repair.

[0072] As a further implementation of the present application, the U-shaped air duct 6 comprises a left air duct 601 and a right air duct 602, and the left air duct 601 and the right air duct 602 are slidingly inserted;

[0073] Specifically, by setting the left air duct 601 and the right air duct 602, the length of the U-shaped air duct 6 is adjusted to adapt to different lengths of the pipe 4.

[0074] As a further implementation of the present application, it further comprises:

[0075] The temperature sensor 16 is fixedly connected in the U-shaped air duct 6 and is used for detecting the temperature of the hot air;

[0076] The first annular connecting plate 17 is slidingly inserted in the inner wall of the right end of the inner shell 7, and the annular sealing ring 11 is fixedly connected to the end of the first annular connecting plate 17.

[0077] The pushing assembly is used for pushing the first annular connecting plate 17 to move into the pipe 4 to be cooled;

[0078] When the temperature sensor 16 detects that the temperature of the hot air exceeds a specified value, the pushing assembly is started to move the first annular connecting plate 17 into the pipe 4 to be cooled, thereby increasing the area of the outer chamber 8 and making the hot air more dispersed to perform overheating protection on the right end of the shell 1.

[0079] Specifically, by setting the temperature sensor 16 and the first annular connecting plate 17, when the temperature sensor 16 detects that the temperature of the hot air exceeds a specified value, the pushing assembly is started to move the first annular connecting plate 17 into the pipe 4 to be cooled, thereby increasing the area of the outer chamber 8 and making the hot air more dispersed to perform overheating protection on the right end of the shell 1, and when the temperature sensor 16 detects that the temperature of the hot air does not exceed a specified value, the first annular connecting plate 17 is reset by the pushing assembly, thereby facilitating the increase of the contact area of the cold air with the pipe 4 and improving the heat dissipation effect.

[0080] In the specific implementation process, the pushing assembly comprises:

[0081] The electric telescopic rod 18 is fixedly connected to the right end of the inner container 9, the end of the electric telescopic rod 18 is fixedly connected with the bracket 19, and the first annular connecting plate 17 is fixedly connected with the bracket 19.

[0082] Specifically, by starting the electric telescopic rod 18, the electric telescopic rod 18 pushes the support 19, so that the first annular connecting plate 17 moves into the pipe to be cooled 4.

[0083] In the specific implementation process, further comprising:

[0084] The first sealing shell 20 is fixedly connected to the right end of the inner container 9, the second sealing shell 21 is slidingly inserted into the right end of the first sealing shell 20, and the second sealing shell 21 is fixedly connected to the support 19. The electric telescopic rod 18 is fixedly connected in the first sealing shell 20;

[0085] Specifically, the first sealing shell 20 and the second sealing shell 21 are arranged to protect the electric telescopic rod 18.

[0086] As a further embodiment of the present application, further comprising:

[0087] The annular mounting plate 22 is fixedly connected to the inner wall near the right end of the shell 1;

[0088] The annular partition plate 23 is fixedly connected to the annular mounting plate 22, and a plurality of first air inlet grooves 24 are arranged on the surface of the annular partition plate 23;

[0089] The second annular connecting plate 25 is slidingly inserted into the inner wall of the right end of the annular partition plate 23, and the second air inlet groove 26 is arranged on the surface of the second annular connecting plate 25 corresponding to the position of the first air inlet groove 24;

[0090] A plurality of connecting rods 27 are fixedly connected to the right end of the second annular connecting plate 25, and the connecting rod 27 is fixedly connected with the annular sealing ring 11;

[0091] Specifically, the annular mounting plate 22 and the annular partition plate 23 are arranged, when the temperature sensor 16 detects that the hot gas temperature exceeds a specified value, the push assembly is started, under the connection action of the connecting rod 27, the second annular connecting plate 25 moves into the pipe 4, the first air inlet groove 24 and the second air inlet groove 26 are misaligned and sealed, when the hot gas enters, the hot gas moves along the annular partition plate 23 to the right, and then enters the outer chamber 8 along the gap between the annular partition plate 23 and the first annular connecting plate 17. In the process of moving along the gap between the annular partition plate 23 and the first annular connecting plate 17, the hot gas contacts the surface of the first annular connecting plate 17, thereby facilitating the precooling of the hot gas and reducing the temperature of the hot gas, thereby facilitating the overheating protection of the right end of the shell 1;

[0092] When the temperature sensor 16 detects that the hot gas temperature does not exceed the specified value, the second annular connecting plate 25 is reset by pushing the assembly, so that the first air inlet groove 24 and the second air inlet groove 26 are communicated, and when the hot gas enters, the hot gas enters the outer chamber 8 directly through the first air inlet groove 24 and the second air inlet groove 26, thereby increasing the air flow speed and rapidly mixing and cooling the hot gas with the cold gas.

[0093] As a further embodiment of the present application, it also includes:

[0094] The spiral conveying blade 28 is fixedly connected to the outer wall of the right end of the inner shell 7.

[0095] Specifically, by arranging the spiral conveying blade 28, the hot gas moves along the trajectory of the spiral conveying blade 28, so that the hot gas is in full contact with the surface of the first annular connecting plate 17, which is beneficial to pre-cooling the hot gas and reducing the temperature of the hot gas, thereby facilitating the overheating protection of the right end of the outer shell 1.

[0096] As a further embodiment of the present application, it also includes:

[0097] The plurality of first air holes 29 are arranged on the right end wall of the inner shell 7 along the trajectory of the spiral conveying blade 28.

[0098] The plurality of second air holes 30 are arranged on the first annular connecting plate 17 away from the first air holes 29.

[0099] Specifically, when the first annular connecting plate 17 moves to the specified position, the second air holes 30 are communicated with the first air holes 29, so that a small amount of cold gas in the inner chamber 10 enters the outer chamber 8 and is rapidly mixed with the newly entered hot gas, which is beneficial to pre-cooling the hot gas and reducing the temperature of the hot gas, thereby facilitating the overheating protection of the right end of the outer shell 1.

[0100] The working principle of the present application is as follows:

[0101] First, the two ends of the pipe to be cooled 4 are connected with the U-shaped air guide pipe 6 and the outer shell 1 respectively through the flanges.

[0102] After the connection is completed, the fan blade 13 is rotated by the driving motor 12, and when the fan blade 13 rotates, the U-shaped air guide pipe 6 is caused to suck the hot gas in the pipe to be cooled 4 into the outer chamber 8 under the action of the negative pressure suction force.

[0103] And through setting the annular sealing ring 11, the mixed cold air can flow from the left end of the pipe 4 to the right end of the pipe 4, so that the cold air can be in full contact with the inner wall of the pipe 4.

[0104] When the cold air flows to the right end of the pipe 4, the residual cold air re-enters the inner chamber 10 under the negative pressure of the U-shaped air duct 6, and mixes with the new cold air, so that the inert gas can be fully utilized, the resources can be saved, the cold air can be in full contact with the inner wall of the pipe 4, and the cooling effect is improved.

[0105] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. An air internal circulation cooling device for introducing a protective gas, characterized by, Include: The left end of the shell (1) is fixedly connected with the top cover (2) by bolt, the right end of the shell (1) is connected with one end of the pipe to be cooled (4) through flange; Air inlet pipe (5) is fixedly connected on the outer wall near the left end of the shell (1), which is used for the inlet of cold air; U-shaped air duct (6), one end of the U-shaped air duct (6) is fixedly connected with the right end of the shell (1), the other end of the U-shaped air duct (6) is connected with the other end of the pipe to be cooled (4) through flange; Inner shell (7), the inner shell (7) is fixedly connected in the shell (1), the outer chamber (8) is left between the inner shell (7) and the shell (1); Inner tank (9), the inner tank (9) is fixedly connected in the inner shell (7), the inner chamber (10) is left between the inner tank (9) and the inner shell (7); Annular sealing ring (11), the annular sealing ring (11) is fixedly connected in the right end of the inner shell (7); Motor (12), the motor (12) is connected with the left end of the inner tank (9) through connecting part, the output shaft of the motor (12) is fixedly connected with the fan blade (13); When the fan blade (13) rotates, the U-shaped air duct (6) sucks the hot air in the pipe to be cooled (4) into the outer chamber (8), in the process of the hot air entering the outer chamber (8), the hot air and the cold air are mixed and enter the inner chamber (10) together, so that the temperature of the hot air is reduced, and then reenters the pipe to be cooled (4), so as to cool the pipe to be cooled (4); Also include: Temperature sensor (16), the temperature sensor (16) is fixedly connected in the U-shaped air duct (6), which is used for detecting the temperature of the hot air; First annular connecting plate (17), the first annular connecting plate (17) is slidingly inserted in the inner wall of the right end of the inner shell (7), the annular sealing ring (11) is fixedly connected in the end of the first annular connecting plate (17); Pushing assembly, the pushing assembly is used for pushing the first annular connecting plate (17), so that the first annular connecting plate (17) moves towards the pipe to be cooled (4); When the temperature sensor (16) detects that the temperature of the hot air exceeds the specified value, the pushing assembly is started, the first annular connecting plate (17) moves towards the pipe to be cooled (4), so as to increase the area of the outer chamber (8), so as to make the hot air more dispersed, so as to overheat protection for the right end of the shell (1).

2. The air internal circulation cooling device for introducing protective gas according to claim 1, characterized by Also include: Annular mounting plate (22), the annular mounting plate (22) is fixedly connected on the inner wall near the right end of the shell (1); Annular partition (23), the annular partition (23) is fixedly connected on the annular mounting plate (22), a plurality of first air inlet grooves (24) are arranged on the surface of the annular partition (23); Second annular connecting plate (25), the second annular connecting plate (25) is slidingly inserted in the inner wall of the right end of the annular partition (23), the second annular connecting plate (25) is provided with second air inlet grooves (26) corresponding to the positions of the first air inlet grooves (24) on the surface; A plurality of connecting rods (27) are fixedly connected to the right end of the second annular connecting plate (25), and the connecting rods (27) are fixedly connected with the annular sealing ring (11).

3. The air internal circulation cooling device for introducing protective gas according to claim 2, characterized by Further comprising: A spiral conveying blade (28) is fixedly connected to the outer wall of the right end of the inner shell (7).

4. The air internal circulation cooling device for introducing protective gas according to claim 3, characterized by Further comprising: A plurality of first air holes (29) are arranged on the right end wall of the inner shell (7) along the track of the spiral conveying blade (28); A plurality of second air holes (30) are arranged on the first annular connecting plate (17) away from the position of the first air holes (29).

5. The air internal circulation cooling device for introducing protective gas according to claim 1, characterized by The pushing assembly comprises: An electric telescopic rod (18) is fixedly connected to the right end of the inner container (9), and the end of the electric telescopic rod (18) is fixedly connected with a support (19), and the first annular connecting plate (17) is fixedly connected with the support (19).

6. The air internal circulation cooling device for introducing protective gas according to claim 5, characterized by Further comprising: A first sealing shell (20) is fixedly connected to the right end of the inner container (9), and a second sealing shell (21) is slidingly inserted into the right end of the first sealing shell (20), and the second sealing shell (21) is fixedly connected to the support (19), and the electric telescopic rod (18) is fixedly connected in the first sealing shell (20).

7. The air internal circulation cooling device for introducing protective gas according to claim 1, characterized by The U-shaped air guide pipe (6) comprises a left air pipe (601) and a right air pipe (602), and the left air pipe (601) and the right air pipe (602) are slidingly inserted.

8. The air internal circulation cooling device for introducing protective gas according to claim 1, characterized by The cold air is inert gas.

9. The air internal circulation cooling device for introducing protective gas according to claim 1, characterized by The connecting component comprises: A base (14) is fixedly connected with the motor (12), and the base (14) is clamped with the left end of the inner container (9); A top base (15) is rotatably connected to the output shaft end of the motor (12); A pressing plate (3) is fixedly connected to the right end of the top cover (2) through a support, and the pressing plate (3) presses the top base (15) to limit the base (14).

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