Small tuyere sleeve

Abstract

The utility model provides a tuyere small sleeve which is of an integrated casting structure and is provided with a first cooling cavity, a second cooling cavity, a first cooling medium inlet, a first cooling medium outlet, a second cooling medium inlet and a second cooling medium outlet, the first cooling medium inlet and the first cooling medium outlet are communicated with the first cooling cavity, the second cooling medium inlet and the second cooling medium outlet are communicated with the second cooling cavity, the tuyere small sleeve comprises a conical sleeve body formed by casting, a first cooling pipe and a second cooling pipe, the first cooling pipe and the second cooling pipe are embedded, and a pipe cavity of the first cooling pipe forms the first cooling cavity. A pipe cavity of the second cooling pipe forms a second cooling cavity. The tuyere small sleeve is long in service life, and the damping-down time interval is prolonged, so that the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace production, in particular to a tuyere small sleeve. BACKGROUND

[0002] In the production of blast furnace, the blast device blows 1200 degrees or so of oxygen-rich gas into the furnace. The blast device includes a straight blowing pipe and a tuyere sleeve installed on the furnace shell. The tuyere sleeve generally includes a tuyere large sleeve, a tuyere middle sleeve and a tuyere small sleeve. The three are conical sleeves. The large diameter end of the tuyere middle sleeve is sleeved into the small diameter end of the tuyere large sleeve, and the large diameter end of the tuyere small sleeve is sleeved into the small diameter end of the tuyere middle sleeve. The large diameter end of the tuyere small sleeve abuts against the straight blowing pipe, and the small diameter end of the tuyere small sleeve extends into the blast furnace. The working environment of the tuyere small sleeve is very harsh. The small diameter end of the tuyere small sleeve is subjected to strong wear of high-speed coal particles and corrosion of high-temperature gas and high-temperature slag, which causes the small diameter end of the tuyere small sleeve to be prone to breakage.

[0003] The traditional tuyere small sleeve includes a main body part and a cap part, which are welded and fixed. One weld is located at the small diameter end of the tuyere small sleeve. Under the strong wear of high-speed coal particles and the corrosion of high-temperature gas and high-temperature slag, the weld position is prone to cracking, which causes the small diameter end of the tuyere small sleeve to be more prone to breakage, resulting in a shorter service life of the tuyere small sleeve.

[0004] The water chamber in the small diameter end of the traditional tuyere small sleeve is provided with baffles to form a curved flow channel, thereby increasing the cooling intensity of the small diameter end. However, this can easily cause a water supply dead zone, leading to local overheating corrosion and softening, resulting in a shorter service life of the tuyere small sleeve.

[0005] The traditional tuyere small sleeve is provided with only one water inlet and one water outlet. When the small diameter end of the tuyere small sleeve is broken, the water supply pressure must be reduced (the water pressure in the water chamber is slightly greater than or approximately equal to the pressure in the furnace) by adjusting the valve opening to avoid the coal gas in the furnace from entering the water inlet pipe and to avoid a large amount of water in the water chamber from leaking into the furnace to destroy the heat system in the furnace and affect the furnace condition. After water control, the cooling intensity is reduced, so the tuyere small sleeve must be replaced after a short period of use after water control, resulting in a shorter service life of the tuyere small sleeve.

[0006] The shorter the service life of the tuyere small sleeve, the shorter the interval between the shutdowns, and the economic loss caused by the shutdown process is much greater than the production cost of one or two tuyere small sleeves. Therefore, the service life of the tuyere small sleeve should be as long as possible to reduce production costs.

[0007] Therefore, how to prolong the service life of the tuyere small sleeve is a technical problem to be solved by those skilled in the art. Utility Model Content

[0008] To solve the above technical problems, the present application provides a tuyere small sleeve, which is an integrated casting structure, has a first cooling chamber and a second cooling chamber, and has a first cooling medium inlet, a first cooling medium outlet, a second cooling medium inlet and a second cooling medium outlet.

[0009] In an embodiment of the tuyere small sleeve, the tuyere small sleeve comprises a conical sleeve body and embedded first and second cooling pipes, the tube cavity of the first cooling pipe forms the first cooling chamber, the tube cavity of the second cooling pipe forms the second cooling chamber, and the two end openings of the first cooling pipe are located at the large-diameter end of the conical sleeve body to form the first cooling medium inlet and the first cooling medium outlet, respectively, and the two end openings of the second cooling pipe are located at the large-diameter end of the conical sleeve body to form the second cooling medium inlet and the second cooling medium outlet, respectively.

[0010] In an embodiment of the tuyere small sleeve, the first and second cooling pipes are distributed at different positions in the circumferential direction of the conical sleeve body.

[0011] In an embodiment of the tuyere small sleeve, the distance between the first cooling pipe and the small-diameter end face of the conical sleeve body is less than the distance between the second cooling pipe and the small-diameter end face of the conical sleeve body, and the heat exchange area of the second cooling pipe and the conical sleeve body is greater than the heat exchange area of the first cooling pipe and the conical sleeve body.

[0012] In an embodiment of the tuyere small sleeve, the first cooling pipe comprises a first inflow pipe section, a first return flow pipe section and a first communication pipe section, the first inflow pipe section extends from the large-diameter end face of the conical sleeve body to the small-diameter end of the conical sleeve body along the length direction of the side wall of the conical sleeve body, the first return flow pipe section extends from the small-diameter end of the conical sleeve body to the large-diameter end face of the conical sleeve body along the length direction of the side wall of the conical sleeve body, the first inflow pipe section and the first return flow pipe section are communicated through the first communication pipe section, and the first communication pipe section winds around the small-diameter end of the conical sleeve body for several turns in the circumferential direction of the conical sleeve body.

[0013] In an embodiment of the tuyere small sleeve, the second cooling pipe comprises a second inflow pipe section, a second return flow pipe section and a second communication pipe section, the second inflow pipe section extends from the large-diameter end face of the conical sleeve body to the small-diameter end of the conical sleeve body along a serpentine path, the second return flow pipe section extends from the small-diameter end of the conical sleeve body to the large-diameter end face of the conical sleeve body along a serpentine path, the second inflow pipe section and the second return flow pipe section are communicated through the second communication pipe section, and the second communication pipe section surrounds the small-diameter end of the conical sleeve body for several turns along the circumference of the conical sleeve body.

[0014] In an embodiment of the tuyere small sleeve, the first inflow pipe section and the first return flow pipe section of the first cooling pipe are symmetrically distributed about a first plane in which the axial center line of the conical sleeve body is located, and the second inflow pipe section and the second return flow pipe section of the second cooling pipe are symmetrically distributed about the first plane in which the axial center line of the conical sleeve body is located.

[0015] In an embodiment of the tuyere small sleeve, the first cooling medium inlet and the first cooling medium outlet are located on one side of a second plane in which the axial center line of the conical sleeve body is located, the second cooling medium inlet and the second cooling medium outlet are located on the other side of the second plane, and the second plane is perpendicular to the first plane.

[0016] In an embodiment of the tuyere small sleeve, a first slope protrusion and a second slope protrusion are arranged on the large-diameter end face of the conical sleeve body, the first cooling medium inlet and the first cooling medium outlet are located on the slope face of the first slope protrusion, and the second cooling medium inlet and the second cooling medium outlet are located on the slope face of the second slope protrusion.

[0017] In an embodiment of the tuyere small sleeve, a central groove is arranged at the center of the large-diameter end of the conical sleeve body, a spherical matching face is arranged on the inner side of the central groove, the spherical matching face is used for matching with a straight blowing pipe, a conical protruding ring is arranged on the outer circumferential face of the conical sleeve body, and the outer conical face of the conical protruding ring is used for matching with a tuyere middle sleeve.

[0018] The tuyere small sleeve provided in the application has no welding seam, thereby avoiding the problem that the welding seam is prone to cracking and shortening the service life of the tuyere small sleeve. In addition, since the first cooling medium inlet and the first cooling medium outlet are communicated with the first cooling chamber, the second cooling medium inlet and the second cooling medium outlet are communicated with the second cooling chamber, and the first cooling chamber and the second cooling chamber are isolated from each other, when one of the first cooling chamber and the second cooling chamber is damaged and leaks, the damaged and leaking one is subjected to water control treatment, and the other one which is not damaged and leaking can continue to maintain a high water supply pressure, thereby continuing to cool the tuyere small sleeve at a high intensity. Therefore, the service life is long, the blow-off time interval is prolonged, and the production cost is reduced.

[0019] Further, the tuyere small sleeve provided by the application utilizes the first cooling pipe and the second cooling pipe to form the first cooling chamber and the second cooling chamber, and the water can flow through each region of the first cooling pipe and the second cooling pipe smoothly, and a water supply dead zone is not easily generated, so that the situation of local overheating and softening due to corrosion can be avoided, and the service life is further prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The large-diameter end view of one embodiment of the tuyere small sleeve provided by the application;

[0021] Figure 2 The large-diameter end view of one embodiment of the tuyere small sleeve provided by the application; Figure 1 The right perspective view of the tuyere small sleeve;

[0022] Figure 3 The left perspective view of the tuyere small sleeve. Figure 1 The reference signs are explained as follows:

[0023] 10 conical sleeve body, 101 first inclined protrusion, 102 second inclined protrusion, 103 central groove, 103a spherical matching surface, 104 conical protruding ring, 104a outer conical surface;

[0024] 20 first cooling pipe, 201 first inflow pipe section, 202 first return flow pipe section, 203 first communication pipe section;

[0025] 30 second cooling pipe, 301 second inflow pipe section, 302 second return flow pipe section, 303 second communication pipe section;

[0026] 40 first inflow pipe, 50 first return flow pipe, 60 second inflow pipe, 70 second return flow pipe, 80 pressing plate, 90 bolt;

[0027] A first cooling medium inlet, B first cooling medium outlet, C second cooling medium inlet, D second cooling medium outlet;

[0028] P1 first plane, P2 second plane.

[0029] DETAILED DESCRIPTION The application provides a tuyere small sleeve. In order for the person skilled in the art to better understand the technical scheme of the application, the technical scheme of the application is further described in detail below in combination with the drawings of the application and the specific embodiments.

[0030] The application provides a tuyere small sleeve. In order for the person skilled in the art to better understand the technical scheme of the application, the technical scheme of the application is further described in detail below in combination with the drawings of the application and the specific embodiments. Figures 1-3 The application provides a tuyere small sleeve. In order for the person skilled in the art to better understand the technical scheme of the application, the technical scheme of the application is further described in detail below in combination with the drawings of the application and the specific embodiments.

[0031] As Figures 1-3As shown, the small tuyere sleeve provided by the present application is of an integrated casting structure. The small tuyere sleeve has a first cooling chamber and a second cooling chamber, and the first cooling chamber and the second cooling chamber are isolated from each other. The small tuyere sleeve also has a first cooling medium inlet A, a first cooling medium outlet B, a second cooling medium inlet C and a second cooling medium outlet D. The first cooling medium inlet A and the first cooling medium outlet B are in communication with the first cooling chamber, and the second cooling medium inlet C and the second cooling medium outlet D are in communication with the second cooling chamber.

[0032] In operation, cooling medium is supplied into the first cooling chamber and the second cooling chamber through the first cooling medium inlet A and the second cooling medium inlet C respectively, and the cooling medium is used to exchange heat with the small tuyere sleeve for cooling. The cooled cooling medium is returned to the cooling medium storage device from the first cooling medium outlet B and the second cooling medium outlet D respectively, so as to realize the recycling of the cooling medium.

[0033] The above small tuyere sleeve has no welds, which avoids the problem that the welds are prone to cracking, thereby shortening the service life of the small tuyere sleeve. The service life of the small tuyere sleeve is prolonged. In addition, since the first cooling medium inlet A and the first cooling medium outlet B are in communication with the first cooling chamber, the second cooling medium inlet C and the second cooling medium outlet D are in communication with the second cooling chamber, and the first cooling chamber and the second cooling chamber are isolated from each other, when one of the first cooling chamber and the second cooling chamber is damaged and leaks, the damaged and leaking one is treated for water control, and the other one which is not damaged and leaks can continue to maintain a high water supply pressure, so as to continue to cool the small tuyere sleeve at high intensity, thereby prolonging the service life of the small tuyere sleeve, prolonging the blowout time interval, and reducing the production cost.

[0034] In some embodiments, as shown in FIG. 1, the small tuyere sleeve has a first cooling chamber 1 and a second cooling chamber 2, and the first cooling chamber 1 and the second cooling chamber 2 are isolated from each other. Figure 2 and Figure 3As shown, the tuyere small sleeve includes a cast conical sleeve body 10 and a pre-embedded first cooling pipe 20 and a second cooling pipe 30. The conical sleeve body 10 has a central hole, and in use, hot air enters the interior of the blast furnace from the central hole of the conical sleeve body 10. During casting, the first cooling pipe 20 and the second cooling pipe 30 are pre-embedded in the cavity of the casting mold, and then the conical sleeve body 10 is cast, and after casting is completed, the lumen of the first cooling pipe 20 forms a first cooling chamber, and the lumen of the second cooling pipe 30 forms a second cooling chamber. The two end openings of the first cooling pipe 20 are located at the large-diameter end of the conical sleeve body 10, respectively forming a first cooling medium inlet A and a first cooling medium outlet B. Specifically, the two end openings of the first cooling pipe 20 can protrude beyond the large-diameter end face of the conical sleeve body 10, or can be flush with the large-diameter end face of the conical sleeve body 10. The two end openings of the second cooling pipe 30 are located at the large-diameter end of the conical sleeve body 10, respectively forming a second cooling medium inlet C and a second cooling medium outlet D. Specifically, the two end openings of the second cooling pipe 30 can protrude beyond the large-diameter end face of the conical sleeve body 10, or can be flush with the large-diameter end face of the conical sleeve body 10. In this way, the first cooling chamber and the second cooling chamber are formed by using the first cooling pipe 20 and the second cooling pipe 30, and the water supply can smoothly flow through each region of the first cooling pipe 20 and the second cooling pipe 30, and it is not easy to produce a water supply dead zone, so as to avoid the local overheating and softening, thereby prolonging the service life of the tuyere small sleeve.

[0035] More specifically, the first cooling pipe 20 and the second cooling pipe 30 are preferably made of a material with good heat resistance and excellent heat conduction performance, such as steel or copper.

[0036] More specifically, the conical sleeve body 10 is preferably made of a material with excellent heat conduction performance and excellent casting performance, such as copper.

[0037] In some embodiments, the first cooling pipe 20 and the second cooling pipe 30 are distributed at different positions on the circumference of the conical sleeve body 10, which on the one hand facilitates the uniformity of heat dissipation of the tuyere small sleeve, and on the other hand facilitates the reduction of production cost. If a part of the first cooling pipe 20 and a part of the second cooling pipe 30 are distributed at the same position on the circumference of the conical sleeve body 10, then they need to be staggered in the radial direction of the conical sleeve body 10, which will increase the wall thickness of the side wall of the conical sleeve body 10, and will increase the volume of the conical sleeve body 10, thereby not conducive to reducing production cost.

[0038] In some embodiments, the distance between the first cooling pipe 20 and the small-diameter end face of the conical sleeve body 10 is less than the distance between the second cooling pipe 30 and the small-diameter end face of the conical sleeve body 10, in combination with the fact that the first cooling pipe 20 and the second cooling pipe 30 are distributed at different positions on the circumference of the conical sleeve body 10, so as to facilitate the uniformity of heat dissipation of the tuyere small sleeve. Figure 2 It is understood that Figure 2In the embodiment, the first cooling pipe 20 is closer to the small-diameter end face of the right side, and the second cooling pipe 30 is farther away from the small-diameter end face of the right side. In addition, the heat exchange area of the second cooling pipe 30 with the conical sleeve body 10 is greater than the heat exchange area of the first cooling pipe 20 with the conical sleeve body 10, and the heat exchange area of the first cooling pipe 20 with the conical sleeve body 10 is less than the heat exchange area of the second cooling pipe 30 with the conical sleeve body 10. In this way, in use, the first cooling pipe 20 closer to the small-diameter end face of the conical sleeve body 10 will break before the second cooling pipe 30. When the first cooling pipe 20 breaks, the first cooling pipe 20 can be treated to control water, and the second cooling pipe 30 can continue to maintain a high water supply pressure, thereby continuing to cool the tuyere small sleeve at a high intensity. Since the heat exchange area of the second cooling pipe 30 with the conical sleeve body 10 is large, the overall tuyere small sleeve can still maintain a high cooling intensity at this time, and there will be no cliff-like drop in cooling intensity due to the cooling failure or cooling intensity drop of the first cooling pipe 20. Therefore, the service life of the tuyere small sleeve can be further prolonged. Figure 2 Understand, Figure 2 In the embodiment, the length of the first cooling pipe 20 is shorter than the length of the second cooling pipe 30, and the outer peripheral surface area of the first cooling pipe 20 is smaller than the outer peripheral surface area of the second cooling pipe 30, so that the heat exchange area of the first cooling pipe 20 with the conical sleeve body 10 is smaller than the heat exchange area of the second cooling pipe 30 with the conical sleeve body 10. In this way, in use, the first cooling pipe 20 closer to the small-diameter end face of the conical sleeve body 10 will break before the second cooling pipe 30. When the first cooling pipe 20 breaks, the first cooling pipe 20 can be treated to control water, and the second cooling pipe 30 can continue to maintain a high water supply pressure, thereby continuing to cool the tuyere small sleeve at a high intensity. Since the heat exchange area of the second cooling pipe 30 with the conical sleeve body 10 is large, the overall tuyere small sleeve can still maintain a high cooling intensity at this time, and there will be no cliff-like drop in cooling intensity due to the cooling failure or cooling intensity drop of the first cooling pipe 20. Therefore, the service life of the tuyere small sleeve can be further prolonged.

[0039] In some embodiments, the pipe diameter of the first cooling pipe 20 is smaller than the pipe diameter of the second cooling pipe 30, which can further compress the space occupied by the first cooling pipe 20 in the conical sleeve body 10, so as to reduce the degree of cooling intensity drop after the first cooling pipe 20 breaks.

[0040] In some embodiments, as shown in Figure 2 and Figure 3 The first cooling pipe 20 includes a first inflow pipe section 201, a first return flow pipe section 202, and a first communication pipe section 203. The first inflow pipe section 201 extends from the large-diameter end face of the conical sleeve body 10 along the length direction of the side wall of the conical sleeve body 10 to the small-diameter end of the conical sleeve body 10. The first return flow pipe section 202 extends from the small-diameter end of the conical sleeve body 10 along the length direction of the side wall of the conical sleeve body 10 to the large-diameter end face of the conical sleeve body 10. The first inflow pipe section 201 and the first return flow pipe section 202 are communicated through the first communication pipe section 203. The first communication pipe section 203 surrounds the small-diameter end of the conical sleeve body 10 for several turns along the circumferential direction of the conical sleeve body 10. In the drawings, the first communication pipe section 203 surrounds the small-diameter end of the conical sleeve body 10 for nearly one turn. In this way, the first cooling pipe 20 can easily avoid the second cooling pipe 30 and leave sufficient space for the second cooling pipe 30. In addition, since the first communication pipe section 203 of the first cooling pipe 20 surrounds the small-diameter end of the conical sleeve body 10 for several turns, the small-diameter end of the conical sleeve body 10 can be sufficiently cooled, and the risk of high-temperature corrosion of the small-diameter end of the conical sleeve body 10 can be reduced.

[0041] In some embodiments, as shown inFigure 2 and Figure 3 As shown, the second cooling pipe 30 includes a second inlet pipe section 301, a second return pipe section 302, and a second connecting pipe section 303. The second inlet pipe section 301 extends from the large-diameter end face of the conical sleeve 10 along a serpentine path to the small-diameter end of the conical sleeve 10. The second return pipe section 302 extends from the small-diameter end of the conical sleeve 10 along a serpentine path to the large-diameter end face of the conical sleeve 10. The second inlet pipe section 301 and the second return pipe section 302 are connected by the second connecting pipe section 303. The second connecting pipe section 303 circles the small-diameter end of the conical sleeve 10 several times in the circumference of the conical sleeve 10. In the figure, the second connecting pipe section 303 circles the small-diameter end of the conical sleeve 10 by a small half circle. With this design, since the second inlet pipe section 301 and the second return pipe section 302 are bent in a serpentine shape, the heat exchange area between the second cooling pipe 30 and the conical sleeve 10 is large. When the cooling intensity of the first cooling pipe 20 decreases or the cooling fails, the second cooling pipe 30 can still cool the conical sleeve 10 with high intensity.

[0042] In some embodiments, the first inlet pipe section 201 and the first return pipe section 202 of the first cooling pipe 20 lie in the first plane P1 about the axial centerline of the tapered sleeve 10 (see...). Figure 1 (As shown by the dashed line) The second inlet pipe section 301 and the second return pipe section 302 of the second cooling pipe 30 are also symmetrically distributed about the first plane P1. This is beneficial to the uniformity of heat dissipation of the air vent sleeve.

[0043] In some embodiments, the first cooling medium inlet A and the first cooling medium outlet B are located on the second plane P2 where the axial centerline of the conical sleeve 10 is located (see...). Figure 1 On one side of the plane (shown by the dashed line), the second cooling medium inlet C and the second cooling medium outlet D are located on the other side of the second plane P2, which is perpendicular to the first plane P1. This prevents interference between the first inlet pipe 40 and the first return pipe 50 connected to the first cooling medium inlet A and the first cooling medium outlet B, and the second inlet pipe 60 and the second return pipe 70 connected to the second cooling medium inlet C and the second cooling medium outlet D.

[0044] In some embodiments, the first inlet pipe 40 and the first return pipe 50 are threadedly connected to the first cooling pipe 20, and the second inlet pipe 60 and the second return pipe 70 are threadedly connected to the second cooling pipe 30. Further, it can also be as follows: Figure 1 As shown, a pressure plate 80 is set and pressed against the large diameter end face of the conical sleeve 10. The pressure plate 80 and the large diameter end of the conical sleeve 10 are fixed by bolts 90. This can avoid the problem of unstable connection by thread alone when the water pressure is too high.

[0045] In some embodiments, such as Figure 1As shown, the large-diameter end face of the conical sleeve 10 is provided with a first sloping protrusion 101 and a second sloping protrusion 102. The first cooling medium inlet A and the first cooling medium outlet B are located on the sloping surface of the first sloping protrusion 101, and the second cooling medium inlet C and the second cooling medium outlet D are located on the sloping surface of the second sloping protrusion 102. The inclination direction of the sloping surfaces of the first sloping protrusion 101 and the second sloping protrusion 102 is that the outer circumference is inclined towards the small-diameter end relative to the inner circumference. With this design, the sloping surfaces of the first sloping protrusion 101 and the second sloping protrusion 102 can be matched with the layout angle of the inlet and return pipes, and the inlet and return pipes can be roughly along a straight line perpendicular to the sloping surfaces. Figure 2 The layout (as shown by the dashed lines L1 and L2) is designed to avoid direct airflow ducts.

[0046] In some embodiments, such as Figure 1 As shown, the conical sleeve 10 has a central groove 103 at the center of its large-diameter end, such as... Figure 2 As shown, the inner side of the central groove 103 is provided with a spherical mating surface 103a, which is used to mate with the direct-blowing air duct. Figure 2 As shown, a tapered protruding ring 104 is provided on the outer circumferential surface of the tapered sleeve 10, and the outer tapered surface 104a of the tapered protruding ring 104 is used to mate with the middle sleeve of the air outlet. In the assembled state, the small sleeve of the air outlet is subjected to a pressure from the direct-blowing air duct toward the small diameter end, and at the same time, the small sleeve of the air outlet is subjected to a pressure from the middle sleeve of the air outlet toward the large diameter end. Under the action of the two opposing pressures, the position is fixed.

[0047] The above embodiments can be freely combined without conflict.

[0048] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A small air vent cover, characterized in that, The air vent sleeve is a one-piece cast structure. The air vent sleeve has a first cooling chamber and a second cooling chamber, which are isolated from each other. It also has a first cooling medium inlet (A), a first cooling medium outlet (B), a second cooling medium inlet (C), and a second cooling medium outlet (D). The first cooling medium inlet (A) and the first cooling medium outlet (B) are connected to the first cooling chamber, and the second cooling medium inlet (C) and the second cooling medium outlet (D) are connected to the second cooling chamber.

2. The air vent sleeve according to claim 1, characterized in that, The air vent sleeve includes a cast conical sleeve (10) and a pre-embedded first cooling pipe (20) and a second cooling pipe (30). The cavity of the first cooling pipe (20) forms the first cooling chamber, and the cavity of the second cooling pipe (30) forms the second cooling chamber. The two ends of the first cooling pipe (20) are located at the large diameter end of the conical sleeve (10), forming the first cooling medium inlet (A) and the first cooling medium outlet (B) respectively. The two ends of the second cooling pipe (30) are located at the large diameter end of the conical sleeve (10), forming the second cooling medium inlet (C) and the second cooling medium outlet (D) respectively.

3. The air vent sleeve according to claim 2, characterized in that, The first cooling pipe (20) and the second cooling pipe (30) are distributed at different positions in the circumferential direction of the conical sleeve (10).

4. The air vent sleeve according to claim 2, characterized in that, The distance between the first cooling pipe (20) and the small-diameter end face of the conical sleeve (10) is less than the distance between the second cooling pipe (30) and the small-diameter end face of the conical sleeve (10), and the heat exchange area between the second cooling pipe (30) and the conical sleeve (10) is greater than the heat exchange area between the first cooling pipe (20) and the conical sleeve (10).

5. The air vent sleeve according to claim 4, characterized in that, The first cooling pipe (20) includes a first inlet pipe section (201), a first return pipe section (202), and a first connecting pipe section (203). The first inlet pipe section (201) extends from the large-diameter end face of the conical sleeve (10) along the length direction of the side wall of the conical sleeve (10) to the small-diameter end face of the conical sleeve (10). The first return pipe section (202) extends from the small-diameter end of the conical sleeve (10) along the length direction of the side wall of the conical sleeve (10) to the large-diameter end face of the conical sleeve (10). The first inlet pipe section (201) and the first return pipe section (202) are connected by the first connecting pipe section (203). The first connecting pipe section (203) wraps around the small-diameter end of the conical sleeve (10) several times in the circumferential direction.

6. The air vent sleeve according to claim 5, characterized in that, The second cooling pipe (30) includes a second inlet pipe section (301), a second return pipe section (302), and a second connecting pipe section (303). The second inlet pipe section (301) extends from the large-diameter end face of the conical sleeve (10) along a serpentine path to the small-diameter end of the conical sleeve (10). The second return pipe section (302) extends from the small-diameter end of the conical sleeve (10) along a serpentine path to the large-diameter end face of the conical sleeve (10). The second inlet pipe section (301) and the second return pipe section (302) are connected by the second connecting pipe section (303). The second connecting pipe section (303) circles the small-diameter end of the conical sleeve (10) several times in the circumferential direction.

7. The air vent sleeve according to claim 6, characterized in that, The first inlet pipe section (201) and the first return pipe section (202) of the first cooling pipe (20) are symmetrically distributed about the first plane (P1) where the axial center line of the conical sleeve (10) is located, and the second inlet pipe section (301) and the second return pipe section (302) of the second cooling pipe (30) are symmetrically distributed about the first plane (P1).

8. The air vent sleeve according to claim 7, characterized in that, The first cooling medium inlet (A) and the first cooling medium outlet (B) are located on one side of the second plane (P2) where the axial center line of the conical sleeve (10) is located, and the second cooling medium inlet (C) and the second cooling medium outlet (D) are located on the other side of the second plane (P2). The second plane (P2) is perpendicular to the first plane (P1).

9. The air vent sleeve according to claims 1-8, characterized in that, The tapered sleeve (10) has a first ramp protrusion (101) and a second ramp protrusion (102) on its large-diameter end face. The first cooling medium inlet (A) and the first cooling medium outlet (B) are located on the ramp surface of the first ramp protrusion (101), and the second cooling medium inlet (C) and the second cooling medium outlet (D) are located on the ramp surface of the second ramp protrusion (102).

10. The air vent sleeve according to claim 9, characterized in that, The conical sleeve (10) has a central groove (103) at the center of its large diameter end. The inner side of the central groove (103) has a spherical mating surface (103a) for mating with the direct-blowing air duct. The outer circumferential surface of the conical sleeve (10) has a conical protrusion ring (104) for mating with the air outlet sleeve.

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