Flushing device for jacking-in type stirring equipment and jacking-in type stirring equipment

Abstract

The invention provides a flushing device for top-in type stirring equipment, which comprises a flushing inner extending pipe, and the flushing inner extending pipe comprises a straight pipe section penetrating through the top surface of the top-in type stirring equipment and a drainage section arranged in the top-in type stirring equipment; the straight pipe section is communicated with the drainage section; the axis of the straight pipe section is parallel to the axis of the stirring shaft, the included angle between the straight pipe section and the drainage section is an obtuse angle, and an opening in the lower end of the drainage section faces the stirring shaft. According to the top-in type stirring equipment, the flushing device is additionally arranged in the top-in type stirring equipment, the solvent is introduced into the stirring shaft through the flushing device, the liquid film is formed on the stirring shaft, and the liquid film flows downwards under the action of gravity to flush the stirring shaft, so that the problem that slurry is easy to adhere to the stirring shaft in the prior art is solved; and the failure rate of the top-in type stirring equipment is reduced, so that the stable operation of the top-in type stirring equipment is maintained.

Description

Technical Field

[0001] The present invention belongs to the technical field of stirring equipment, and in particular relates to a flushing device for top-entry stirring equipment. In addition, the present invention also relates to a top-entry stirring equipment comprising the flushing device. Background Art

[0002] Top-entry stirring equipment refers to stirring equipment in which the stirring shaft extends downward from the top of the container. Most of the existing slurry tanks are equipped with top-entry stirring shafts. However, during the stirring process, the slurry tends to adhere to the stirring shaft, that is, there is a problem of slurry climbing the pole. As the stirring time gets longer, the slurry adhering to the stirring shaft becomes thicker and thicker, which will affect the stirring efficiency. Secondly, it is likely to cause damage to the stirring shaft (due to the adhesion of solids on the stirring shaft, the weight distribution is uneven, and the stirring shaft will shake when it rotates, which is easy to be damaged if it runs for a long time). Thirdly, it may cause lumps of slurry to fall and damage the stirring blades or block the slurry tank discharge port, ultimately making the stirring equipment unable to operate stably.

[0003] In view of this, developing a flushing device that can solve the problem of slurry adhering to the stirring shaft has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art by adding a flushing device in the top-entry stirring equipment, and then introducing the solvent into the stirring shaft through the flushing device to form a liquid film on the stirring shaft. The liquid film flows downward under the action of gravity to flush the stirring shaft, thereby solving the problem in the prior art that the slurry is easy to adhere to the stirring shaft, thereby maintaining the stable operation of the top-entry stirring equipment.

[0005] The present invention is achieved through the following technical solutions:

[0006] One of the objects of the present invention is to provide a flushing device for a top-entry stirring equipment, the flushing device for the top-entry stirring equipment comprising an inner flushing pipe, the inner flushing pipe comprising a straight pipe section passing through the top surface of the top-entry stirring equipment and a drainage section arranged in the top-entry stirring equipment; the straight pipe section and the drainage section are connected to each other; the axis of the straight pipe section is parallel to the axis of the stirring shaft, the angle between the straight pipe section and the drainage section is an obtuse angle, and the lower end opening of the drainage section faces the stirring shaft.

[0007] In a preferred embodiment of the present invention,

[0008] The horizontal distance between the lower end of the drainage section and the stirring shaft is 30 to 100 mm; and / or

[0009] The lower end surface of the drainage section is located above the cross section at the center of the stirring shaft.

[0010] In a preferred embodiment of the present invention, the flushing device for the top-entry stirring equipment further comprises:

[0011] a distributor, which is a hollow ring and is connected to the lower end of the drainage section; the distributor is coaxial with the stirring shaft, and the inner diameter of the distributor is larger than the outer diameter of the stirring shaft; the distributor is located above the cross section at the center of the stirring shaft; and

[0012] A nozzle is arranged on the inner wall of the distributor and faces the stirring shaft; the number of the nozzles is multiple and the multiple nozzles are arranged at equal intervals.

[0013] In a preferred embodiment of the present invention, the angle between the nozzle and the horizontal plane is 30 to 60 degrees.

[0014] In a preferred embodiment of the present invention, the number of the nozzles is 4 to 8.

[0015] In a preferred embodiment of the present invention, the flushing device for the top-entry stirring equipment also includes a liquid collection tank connected to the stirring shaft, the liquid collection tank is located above the cross-section at the center of the stirring shaft; the bottom opening of the liquid collection tank is coaxial with the stirring shaft; the inner diameter of the bottom opening of the liquid collection tank is larger than the outer diameter of the stirring shaft; the liquid collection tank is longitudinally provided with a hollow accommodating portion, the top surface of the hollow accommodating portion is located below the drainage section, and the bottom surface is communicated with the bottom opening of the liquid collection tank.

[0016] In a preferred embodiment of the present invention, an annular underflow area is formed between the bottom opening of the liquid accumulation tank and the stirring shaft, and the area of ​​the annular underflow area is equal to the cross-sectional area of ​​the flushing inner extension pipe.

[0017] In a preferred embodiment of the present invention, the liquid accumulation tank is in the shape of an inverted trapezoid or an inverted truncated cone.

[0018] In a preferred embodiment of the present invention, the distance between the top surface of the liquid accumulation groove and the lower end of the drainage section is greater than 50 mm.

[0019] The second object of the present invention is to provide a top-entry stirring equipment including the flushing device according to one of the objects of the present invention. The top-entry stirring equipment includes a tank body, a stirring shaft and the flushing device for the top-entry stirring equipment according to one of the objects of the present invention.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By adding a flushing device in the top-entry stirring equipment, the solvent is introduced into the stirring shaft through the flushing device to form a liquid film on the stirring shaft. The liquid film flows downward under the action of gravity to flush the stirring shaft, thereby solving the problem of slurry easily adhering to the stirring shaft in the prior art, reducing the failure rate of the top-entry stirring equipment, and maintaining the stable operation of the top-entry stirring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of a top-entry stirring device including a flushing device according to Example 1 of the present invention;

[0023] Figure 2 This is a front view of a straight pipe section and a drainage section in a flushing device for a top-entry stirring device according to Example 1 of the present invention;

[0024] Figure 3 It is a front view of a top-entry stirring device including a flushing device according to Embodiment 2 of the present invention;

[0025] Figure 4 A stereoscopic diagram of a distributor, a nozzle and a flushing inner extension pipe in a flushing device for a top-entry stirring device according to Example 2 of the present invention;

[0026] Figure 5 It is a front view of a top-entry stirring device including a flushing device according to Example 3 of the present invention;

[0027] Figure 6 A top view of a liquid storage tank in a flushing device for a top-entry stirring device according to Example 3 of the present invention;

[0028] In the figure, 1-flushing inner extension pipe, 11-straight pipe section, 12-drainage section; 2-agitation shaft; 3-distributor; 4-sprinkler; 5-liquid accumulation tank; 6-upper head. DETAILED DESCRIPTION

[0029] In the present invention, the TL line refers to the junction between the elliptical upper head and the upper end of the cylinder.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0031] Example 1

[0032] like Figure 1 As shown, the present invention provides a flushing device for top-entry stirring equipment, which includes a flushing inner extension pipe 1. The flushing inner extension pipe 1 includes a straight pipe section 11 and a drainage section 12 (such as Figure 2As shown in the figure, the straight pipe section 11 and the drainage section 12 are integrally formed and interconnected, and the lower end of the straight pipe section 11 is connected to the upper end of the drainage section 12. The flushing inner extension pipe 1 is installed on the top surface of the top-entry stirring device and is close to the stirring shaft 2 in the top-entry stirring device. The straight pipe section 11 in the flushing inner extension pipe 1 is detachably connected to the top surface of the top-entry stirring device, and the axis of the straight pipe section 11 is parallel to the axis of the stirring shaft 2. That is, a part of the straight pipe section 11 is located inside the top-entry stirring device, and a part is located outside the top-entry stirring device. The drainage section 12 in the flushing inner extension pipe 1 is entirely located inside the top-entry stirring device. The angle between the straight pipe section 11 and the drainage section 12 is an obtuse angle, preferably 120 to 150°. The lower end of the drainage section 12 opens toward the stirring shaft 2. The horizontal distance between the lower end of the drainage section 12 and the stirring shaft 2 is smaller than the horizontal distance between the straight pipe section 11 and the stirring shaft 2. The horizontal distance between the lower end of the drainage section 12 and the stirring shaft 2 is preferably 30-100 mm to prevent the stirring shaft 2 from colliding with each other and damaging the stirring shaft 2 when the stirring shaft 2 is running.

[0033] The specific flushing steps of the flushing device are as follows: the upper end of the straight pipe section 11 is open, and the solvent can be introduced into the straight pipe section 11 through the opening. Since the straight pipe section 11 is arranged vertically, the solvent flows from the upper end of the straight pipe section 11 to the lower end of the straight pipe section 11 under the action of gravity. Since the straight pipe section 11 and the drainage section 12 are interconnected, the solvent enters the drainage section 12 from the straight pipe section 11, and continues to flow along the drainage section 12 under the action of gravity, and then reaches the lower end of the drainage section 12. Since the lower end opening of the drainage section 12 faces the stirring shaft 2 and the drainage section 12 has a certain slope, the solvent flows out of the drainage section 12 and moves obliquely downward to the stirring shaft 2, and forms a liquid film on the stirring shaft 2. The liquid film flows downward under the action of gravity to achieve full-section flushing of the stirring shaft 2. It should be noted that the solvent moves onto the stirring shaft 2 and flows downward along the stirring shaft, thereby forming a flowing liquid film on the stirring shaft 2 to prevent the slurry from climbing the rod and adhering to the stirring shaft 2. As the stirring shaft 2 rotates, the solvent moves evenly to the entire outer peripheral surface of the stirring shaft 2 at the same height.

[0034] In one preferred embodiment of the present invention, the lower end surface of the drainage section 12 is located above the cross section at the center of the stirring shaft 2, that is, the lower end of the drainage section 12 is close to the upper half of the stirring shaft 2 rather than the lower half. Preferably, the vertical distance between the lower end of the drainage section 12 and the TL line of the upper head 6 in the top-entry stirring device is less than 500mm, so that except for the section with a vertical distance of no more than 500mm between the upper head 6 and the stirring shaft 2, other parts can have a downward liquid film flow and are not easy to scale, thereby ensuring that the stirring shaft 2 runs more stably and shakes less. On the one hand, after the solvent moves to the stirring shaft 2, since the vertical distance between the lower end of the drainage section 12 and the TL line of the upper head 6 in the top-entry stirring device is less than 500mm, the falling speed of the solvent gradually increases during the falling process along the stirring shaft 2, which produces a greater impact and scrubbing force on the lower half of the stirring shaft 2 that is more prone to slurry adhesion, achieving a better cleaning effect. On the other hand, if there is a lot of slurry, part of the slurry will splash to the upper part of the stirring shaft 2 during the stirring process, forming a flushing dead angle. The vertical distance between the lower end of the drainage section 12 and the TL line of the upper head 6 in the top-entry stirring equipment is less than 500mm, which can flush the slurry splashed to the upper part of the stirring shaft 2, making it easier to achieve full-section cleaning and wetting of the stirring shaft 2. It should be noted that the vertical distance between the liquid level of the slurry and the TL line of the upper head 6 is generally greater than 500mm. In addition, it can also make the operation flexibility of the top-entry stirring equipment greater. This is because the liquid level of the slurry in the top-entry stirring equipment can be higher, and the amount of slurry processed can be more.

[0035] In one of the more preferred embodiments of the present invention, the flushing solvent is a solvent of the slurry system. When the solvent moves to the stirring shaft 2, the slurry is not easy to adhere to the stirring shaft 2 because there is a flowing solvent on the stirring shaft 2, but moves downward along the stirring shaft 2 with the solvent, which solves the problem in the prior art that the block slurry falls and damages the stirring blades at the lower end of the stirring shaft 2, or blocks the discharge port of the top-entry stirring device, or the stirring shaft 2 is damaged by a large amount of climbing rods on the stirring shaft 2, causing the stirring shaft 2 to shake significantly. Exemplarily, in the refining section crystallizer of the PTA device (i.e., a device for oxidizing paraxylene to produce terephthalic acid), the slurry system solvent is water, and the flushing solvent is water.

[0036] Example 2

[0037] like Figure 3 As shown, the present invention provides a flushing device for top-entry stirring equipment, which includes the flushing inner extension pipe 1 in embodiment 1, and also includes a distributor 3 and a nozzle 4. The distributor 3 is an annular pipe distributor, and its interior is hollow. The distributor 3 is connected to the lower end of the drainage section 12. The inner diameter of the distributor 3 is larger than the outer diameter of the stirring shaft 2, and the stirring shaft 2 can pass through.

[0038] In a preferred embodiment of the present invention, the distributor 3 is coaxial with the stirring shaft 2 to achieve uniform flushing of the outer periphery of the stirring shaft 2. More preferably, a plurality of nozzles 4 are evenly arranged on the inner wall of the distributor 3. Preferably, the nozzle 4 does not spray in a horizontal direction, but sprays obliquely downward, and the angle between the nozzle 4 and the horizontal plane is preferably 30 to 60 degrees to ensure that after the solvent is sprayed onto the stirring shaft 2, a uniform liquid film can be better formed on the stirring shaft 2. If it is greater than this angle range, it is easy to cause the solvent moving to the stirring shaft 2 to splash, which is not conducive to the formation of a uniform liquid film. More preferably, 4 to 8 nozzles 4 are distributed on the distributor 3, so that after the solvent is sprayed onto the stirring shaft 2, a uniform liquid film can be better formed on the stirring shaft 2, thereby achieving uniform flushing of the stirring shaft 2. Figure 4 In the embodiment, the number of the nozzles 4 is four, which does not constitute a limitation to the present invention, and the technicians can set a suitable number of the nozzles 4 according to the actual flushing requirements.

[0039] In a more preferred embodiment of the present invention, the straight pipe section 11 located outside the top-entry stirring equipment is provided with a flow regulating valve, and the flow rate of the nozzle 4 can be controlled by adjusting the flow regulating valve to ensure that the solvent passes through the annular pipe portion of the distributor 3 to fully, evenly and stably cover the stirring shaft 2 to avoid deviation or local areas not being covered by the liquid film.

[0040] The specific flushing steps of the flushing device are as follows: the upper end of the straight pipe section 11 is open, and the solvent can be introduced into the straight pipe section 11 through the opening. Since the straight pipe section 11 is arranged vertically, the solvent flows from the upper end of the straight pipe section 11 to the lower end of the straight pipe section 11 under the action of gravity. Since the straight pipe section 11 and the drainage section 12 are connected to each other, the solvent enters the drainage section 12 from the straight pipe section 11, continues to flow along the drainage section 12 under the action of gravity, and then reaches the lower end of the drainage section 12. Since the distributor 3 is hollow inside and is connected to the lower end of the drainage section 12, the solvent flows out of the drainage section 12 and enters the hollow distributor 3. The solvent forms a jetted liquid flow under the action of the pressure of the nozzle 4, and moves to the stirring shaft 2 to form a uniform liquid film. The liquid film flows downward along the stirring shaft 2 under the action of gravity to achieve flushing of the stirring shaft 2.

[0041] Compared with the flushing device for top-entry stirring equipment in Example 1, the flushing uniformity of the stirring shaft 2 in this embodiment is higher, and due to the spray impact force of the nozzle 4, the flushing effect of the stirring shaft 2 in this embodiment is further enhanced.

[0042] Example 3

[0043] like Figure 5As shown, the present invention provides a flushing device for top-entry stirring equipment, which includes the flushing inner extension pipe 1 in embodiment 1, and also includes a liquid collection tank 5, which has an opening on the top surface and an opening on the bottom surface to pass through the stirring shaft 2. The liquid collection tank 5 is fixedly connected to the stirring shaft 2. Since the two are fixedly connected, the two will not collide during the stirring process, which is conducive to extending the service life of the flushing device. Specifically, the bottom surface of the liquid collection tank 5 is fixedly connected to the stirring shaft 2 by a tie rod, but this does not constitute a limitation on the connection method between the two. The function of the liquid collection tank 5 is to ensure that there is a certain liquid level in the liquid collection tank 5. Due to the blocking effect of the side wall of the liquid collection tank 5, the solvent entering the liquid collection tank 5 is not easily thrown out, thereby ensuring the flushing effect of the stirring shaft 2, and is suitable for top-entry stirring equipment with a high speed of the stirring shaft 2. The inner diameter of the opening on the bottom surface of the liquid collection tank 5 is larger than the outer diameter of the stirring shaft 2, so that the solvent entering the liquid collection tank 5 from the flushing inner extension pipe 1 can pass through the liquid collection tank 5 and continue to move downward to form a liquid film to achieve flushing of the stirring shaft 2.

[0044] The liquid collection tank 5 is provided with a hollow receiving portion, which is a hollow portion extending downward from the open top surface of the liquid collection tank 5. The top surface of the hollow receiving portion is located below the drainage section 12, and the bottom surface is connected to the bottom opening of the liquid collection tank 5. The width of the bottom surface of the hollow receiving portion is greater than the diameter of the bottom opening. Preferably, the distance between the top surface of the liquid collection tank 5 and the lower end of the drainage section 12 is greater than 50 mm to avoid collision between the two when the top-entry stirring shaft 2 is in operation. The hollow receiving portion is located below the drainage section 12 to receive the solvent flowing into the drainage section 12 to achieve flushing of the stirring shaft 2.

[0045] In a preferred embodiment of the present invention, the radius of the bottom opening of the liquid sump 5, the radius of the flushing inner extension tube 1, and the radius of the stirring shaft 2 conform to the following relationship to ensure that there is a certain liquid level in the liquid sump 5, thereby ensuring that the solvent flows downward more evenly along the annular underflow area between the bottom opening of the liquid sump 5 and the stirring shaft 2.

[0046] π×R1 2 =π×(R3 2 -R2 2 )

[0047] Wherein, R1 is the radius of the flushing inner extension pipe 1, R2 is the radius of the stirring shaft 2, and R3 is the radius of the bottom opening of the liquid accumulation tank 5.

[0048] That is, the area of ​​the annular underflow zone between the bottom opening of the liquid storage tank 5 and the stirring shaft 2 is equal to the cross-sectional area of ​​the flushing inner extension pipe 1.

[0049] The straight pipe section 11 located outside the top-entry stirring device is provided with a flow regulating valve, and the liquid level of the liquid storage tank 5 can be controlled by adjusting the flow regulating valve to ensure that the solvent fully, evenly and stably covers the stirring shaft 2, especially to avoid biased flow or local areas not covered with liquid film. Compared with embodiment 2, this embodiment further reduces the cost while ensuring the flushing effect and flushing uniformity.

[0050] Figure 6 In the figure, the liquid accumulation tank 5 is an inverted trapezoid, and the top opening forms a hollow receiving portion with an opening facing upward to receive the solvent flowing in from the drainage section 12, thereby flushing the stirring shaft 2. The liquid accumulation tank 5 is configured as a trapezoid. On the one hand, the inclination of the side of the liquid accumulation tank 5 is utilized to allow the solvent to flow downward into the opening position on the bottom surface of the liquid accumulation tank 5, and then move downward on the stirring shaft 2 to form a liquid film. On the other hand, the weight and amount of liquid accumulated in the liquid accumulation tank 5 can be reduced. While satisfying the flushing effect of the stirring shaft 2, the weight load of the stirring shaft 2 is reduced, which can reduce the motor load and avoid the shaking of the stirring shaft 2 due to uneven weight distribution after the liquid accumulation tank 5 is partially added. The top opening of the liquid accumulation tank 5 is beneficial for draining the solvent into the liquid accumulation tank 5, and is also beneficial for cleaning, inspection and maintenance, etc. It should be noted that Figure 6 The inverted trapezoidal body does not constitute a limitation on the shape of the liquid collection tank 5 of the present invention, and the liquid collection tank 5 can also be set to an inverted truncated cone. The technician can select a suitable shape of the liquid collection tank 5 according to the adhesion degree of the slurry on the stirring shaft 2.

[0051] The specific flushing steps of the flushing device are as follows: the upper end of the straight pipe section 11 is open, and the solvent can be introduced into the straight pipe section 11 through the opening. Since the straight pipe section 11 is arranged vertically, the solvent flows from the upper end of the straight pipe section 11 to the lower end of the straight pipe section 11 under the action of gravity. Since the straight pipe section 11 and the drainage section 12 are connected to each other, the solvent enters the drainage section 12 from the straight pipe section 11, and continues to flow along the drainage section 12 under the action of gravity, and then reaches the lower end of the drainage section 12. The top surface of the hollow accommodation portion is located below the drainage section 12, and the bottom surface is connected to the bottom surface opening of the liquid collection tank 5. Therefore, the solvent flows from the lower end of the drainage section 12 to the hollow accommodation portion of the liquid collection tank 5, passes through the bottom end opening of the liquid collection tank 5, passes through the liquid collection tank 5, and continues to flow downward to the stirring shaft 2, forming a liquid film on the stirring shaft 2. The liquid film flows downward along the stirring shaft 2 under the action of gravity, thereby flushing the entire stirring shaft 2 .

[0052] Example 4

[0053] The present invention provides a top-entry stirring device, which comprises a tank body, a stirring shaft 2, and a flushing device for a top-entry stirring device according to any one of embodiments 1 to 3. The tank body is provided with an upper end cap 6, a lower end cap, and a cylindrical structure arranged therebetween.

[0054] When the top-entry stirring device includes the flushing device of Example 1, the top-entry stirring device includes a tank body, a stirring shaft 2 and a flushing inner extension pipe 1. The structure of the flushing inner extension pipe 1 has been described in detail in Example 1 and will not be repeated here.

[0055] When the top-entry stirring device includes the flushing device of Example 2, the top-entry stirring device includes a tank body, a stirring shaft 2, a flushing inner extension pipe 1, a distributor 3 and a nozzle 4. The structures of the distributor 3 and the nozzle 4 have been described in detail in Example 1 and will not be repeated here.

[0056] When the top-entry stirring device includes the flushing device of Example 3, the top-entry stirring device includes a tank body, a stirring shaft 2, a flushing inner extension pipe 1 and a liquid collection tank 5. The structure of the liquid collection tank 5 has been described in detail in Example 1 and will not be repeated here.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0059] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A flushing device for top-entry stirring equipment, characterized in that: It comprises a flushing inner extension pipe, which comprises a straight pipe section passing through the top surface of the top-entry stirring equipment and a drainage section arranged in the top-entry stirring equipment; the straight pipe section and the drainage section are connected to each other; the axis of the straight pipe section is parallel to the axis of the stirring shaft, the angle between the straight pipe section and the drainage section is an obtuse angle, and the lower end opening of the drainage section faces the stirring shaft.

2. The flushing device for top-entry stirring equipment according to claim 1, characterized in that: The horizontal distance between the lower end of the drainage section and the stirring shaft is 30 to 100 mm; and / or The lower end surface of the drainage section is located above the cross section at the center of the stirring shaft.

3. The flushing device for top-entry stirring equipment according to claim 1, characterized in that: Also includes: The distributor is a hollow ring-shaped device connected to the lower end of the drainage section; the distributor is coaxial with the stirring shaft, and the inner diameter of the distributor is larger than the outer diameter of the stirring shaft; The distributor is located above the cross section at the center of the stirring shaft; and A nozzle is arranged on the inner wall of the distributor and faces the stirring shaft; the number of the nozzles is multiple and the multiple nozzles are arranged at equal intervals.

4. The flushing device for top-entry stirring equipment according to claim 3, characterized in that: The angle between the nozzle and the horizontal plane is 30 to 60 degrees.

5. The flushing device for top-entry stirring equipment according to claim 3, characterized in that: The number of the nozzles is 4 to 8.

6. The flushing device for top-entry stirring equipment according to claim 4, characterized in that: It also includes a liquid collection groove connected to the stirring shaft, the liquid collection groove is located above the cross section at the center of the stirring shaft; the bottom opening of the liquid collection groove is coaxial with the stirring shaft; the inner diameter of the bottom opening of the liquid collection groove is larger than the outer diameter of the stirring shaft; the liquid collection groove is longitudinally provided with a hollow accommodating portion, the top surface of the hollow accommodating portion is located below the drainage section, and the bottom surface is communicated with the bottom opening of the liquid collection groove.

7. The flushing device for top-entry stirring equipment according to claim 6, characterized in that: An annular underflow area is formed between the bottom opening of the liquid accumulation tank and the stirring shaft, and the area of ​​the annular underflow area is equal to the cross-sectional area of ​​the flushing inner extension pipe.

8. The flushing device for top-entry stirring equipment according to claim 6, characterized in that: The liquid accumulation tank is in the shape of an inverted trapezoid or an inverted truncated cone.

9. The flushing device for top-entry stirring equipment according to claim 6, characterized in that: The distance between the top surface of the liquid accumulation groove and the lower end of the drainage section is greater than 50 mm.

10. A top-entry stirring device, characterized in that: The invention comprises a tank body, a stirring shaft and a flushing device for top-entry stirring equipment as claimed in any one of claims 1 to 9.

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