Pulping apparatus

Abstract

The application provides a pulping device, which comprises a circulating tank, a sleeve, a dispersing device and a flow guide cylinder. The circulating tank is provided with a containing cavity for containing slurry. The sleeve is arranged at the top of the circulating tank and extends into the containing cavity. The dispersing device is installed at the end of the sleeve close to the bottom wall of the circulating tank, and the side of the dispersing device close to the bottom wall of the circulating tank is provided with a flow inlet communicating with the containing cavity. The side wall of the dispersing device is provided with a flow outlet communicating with the flow inlet. The flow guide cylinder is connected with the dispersing device, and the inner wall of the flow guide cylinder and the outer wall of the sleeve form a flow guide channel. The end of the flow guide channel close to the top of the circulating tank communicates with the containing cavity, and the end of the flow guide channel close to the bottom wall of the circulating tank communicates with the flow outlet. In this way, the slurry is dispersed and circulated in the circulating tank, the circulation path of the slurry between the dispersing device and the circulating tank is greatly shortened, the slurry circulation efficiency is effectively improved, and the circulation time of the slurry is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulping equipment, and in particular to a pulping equipment. BACKGROUND

[0002] In the related art, a circulating tank and a dispersing device in a pulping equipment are connected together through a connecting pipeline. The pulp circulates between the circulating tank and the dispersing device through the connecting pipeline, and the circulating path of the pulp is long, and the circulating efficiency is low. SUMMARY

[0003] The present application provides a pulping equipment to solve the problem of long circulating path of the pulp and low circulating efficiency.

[0004] The present application provides a pulping equipment, which comprises a circulating tank, a sleeve, a dispersing device and a flow guide cylinder. The circulating tank is provided with a containing cavity for containing pulp. The sleeve is arranged at the top of the circulating tank and extends into the containing cavity. The dispersing device is installed at the end of the sleeve close to the bottom wall of the circulating tank, one side of the dispersing device close to the bottom wall of the circulating tank is provided with a flow inlet, the flow inlet is in communication with the containing cavity, and the side wall of the dispersing device is provided with a flow outlet in communication with the flow inlet. The flow guide cylinder is connected with the dispersing device, the inner wall of the flow guide cylinder and the outer wall of the sleeve form a flow guide channel, one end of the flow guide channel close to the top of the circulating tank is in communication with the containing cavity, and the end of the flow guide channel close to the bottom wall of the circulating tank is in communication with the flow outlet.

[0005] In some embodiments, the cross-sectional area of the flow guide channel at a position close to the top of the circulating tank is greater than or equal to the cross-sectional area at a position close to the bottom of the circulating tank.

[0006] In some embodiments, the sleeve extends in the axial direction of the circulating tank, the dispersing device comprises a first dispersing member and a second dispersing member, the second dispersing member is rotatable relative to the first dispersing member, the end of the sleeve close to the bottom of the circulating tank is connected with the second dispersing member, and the end of the flow guide cylinder close to the bottom of the circulating tank is connected with the first dispersing member.

[0007] In some embodiments, the flow guide channel comprises a first flow passage and a second flow passage in communication with the first flow passage, the flow guide cylinder comprises a side plate extending along the axial direction of the circulating tank and a bottom plate connected to the end of the side plate near the bottom of the circulating tank, the first flow passage is formed between the side plate and the side wall of the sleeve, the bottom plate extends along the radial direction of the circulating tank, the first flow passage is in communication with the containing cavity, the bottom plate is connected with the first dispersion member, the bottom plate and the end surface of the sleeve near the bottom of the circulating tank form the second flow passage, and the end of the second flow passage away from the first flow passage is in communication with the flow outlet.

[0008] In some embodiments, the pulping device further comprises a driving shaft, the driving shaft is arranged in the sleeve, and the end of the driving shaft near the bottom of the circulating tank is connected with the dispersion device.

[0009] In some embodiments, the end of the flow guide cylinder away from the bottom of the circulating tank is inclined or curved towards the direction away from the sleeve.

[0010] In some embodiments, the dispersion device comprises a first dispersion member and a second dispersion member, the second dispersion member is rotatably arranged relative to the first dispersion member, the first dispersion member comprises a first disc body and at least one first blocking ring, the first disc body is fixedly connected with the flow guide cylinder, the flow inlet is formed on the first disc body, the first blocking ring is arranged on one side of the first disc body near the second dispersion member, and the first blocking ring is provided with a first dispersion groove; the second dispersion member comprises a second disc body and at least one second blocking ring, the second disc body is fixed relative to the sleeve, the second blocking ring is arranged on one side of the second disc body near the first dispersion member, the second blocking ring is provided with a second dispersion groove, the first blocking ring is located on the inner side and / or the outer side of the second blocking ring, and the first dispersion groove or the second dispersion groove located on the outermost side of the dispersion device is configured as the flow outlet.

[0011] In some embodiments, the dispersion device further comprises a pushing blade arranged on the first disc body or the second disc body, and the pushing blade is used to push the slurry along the radial direction of the dispersion device.

[0012] In some embodiments, the flow guide cylinder is rotatably arranged relative to the circulating tank, and / or the sleeve is rotatably arranged relative to the circulating tank.

[0013] In some embodiments, the pulping device further comprises a baffle plate arranged on the sleeve and located on the side of the flow guide cylinder away from the bottom of the circulating tank, and in a plane perpendicular to the central axis of the sleeve, the baffle plate at least partially covers the outlet of the flow guide channel near the side of the top of the circulating tank.

[0014] In some embodiments, the first distance between the cylinder wall of the draft tube and the bottom of the circulating tank is greater than or equal to the second distance between the cylinder wall of the draft tube and the cylinder wall of the sleeve along the radial direction of the circulating tank.

[0015] In some embodiments, the ratio of the first distance and the second distance is 1-10.

[0016] In some embodiments, the ratio of the distance between the opening of the draft passage near the top of the circulating tank and the bottom of the circulating tank and the distance between the liquid surface of the slurry and the bottom of the circulating tank is 0.8-3.

[0017] In some embodiments, the ratio of the spacing distance between the draft tube and the bottom of the circulating tank and the diameter of the flow inlet is greater than 0.3.

[0018] In some embodiments, the pulp making device further comprises a stirring structure arranged on the top of the circulating tank or on the sleeve, and the stirring structure is used for stirring the slurry.

[0019] In some embodiments, the pulp making device further comprises a cooling structure arranged on the top of the circulating tank and extending into the containing cavity, and the cooling structure is used for cooling the slurry.

[0020] In the pulp making device provided by the present application, the sleeve is arranged on the top of the circulating tank and extends into the containing cavity, the dispersion device is mounted on the end of the sleeve close to the bottom wall of the circulating tank, the dispersion device is provided with a flow inlet and a flow outlet in communication with the flow inlet, the flow inlet is in communication with the containing cavity of the circulating tank, the draft tube is connected with the dispersion device, the inner wall of the draft tube and the outer portion of the sleeve form a draft passage, one end of the draft passage close to the top of the circulating tank is in communication with the containing cavity, and the end of the draft passage close to the bottom wall of the circulating tank is in communication with the flow outlet. The slurry is dispersed and circulated in the circulating tank. On the one hand, the dispersion device is located in the interior of the circulating tank, which greatly shortens the circulation path of the slurry between the dispersion device and the circulating tank, effectively improves the slurry circulation efficiency, and reduces the circulation time of the slurry. On the other hand, no additional connecting pipeline is needed to connect the dispersion device and the circulating tank together, thereby simplifying the structure of the pulp making device, making the structure of the pulp making device more compact, being conducive to the miniaturization of the pulp making device, reducing the floor area occupied by the pulp making device, and reducing the manufacturing cost and installation cost of the pulp making device. On the other hand, the sleeve is arranged on the top of the circulating tank, which is conducive to separating the circulating tank from other structures of the pulp making device, thereby greatly reducing the difficulty of cleaning the pulp making device. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 is a sectional view of a pulping device provided by the embodiments of the present application.

[0023] Figure 2 is a structural schematic view of a dispersing device provided by some embodiments of the present application.

[0024] Figure 3 is a sectional view of a part of structure in a pulping device provided by some embodiments of the present application.

[0025] Figure 4 is a sectional view of a part of structure in a pulping device provided by some embodiments of the present application.

[0026] Figure 5 is a structural schematic view of a sleeve provided by some embodiments of the present application.

[0027] Figure 6 is a sectional view of a pulping device provided by some embodiments of the present application.

[0028] Figure 7 is a sectional view of a pulping device provided by some embodiments of the present application.

[0029] Main figure mark explanation: pulping device 100; circulating tank 10; containing cavity 101; top part 102; bottom part 103; top cover 11; side wall 12; extension plate 121; bottom wall 13; discharge port 131; central axis C1; sleeve 20; driving shaft 21; baffle 22; first plate body 221; second plate body 222; flow guide structure 23; dispersing device 30; flow inlet 301; flow outlet 302; first dispersing piece 31; first disc body 311; first baffle ring 312; first dispersing groove 3121; second dispersing piece 32; second disc body 321; second baffle ring 322; second dispersing groove 3221; pushing blade 323; flow guide cylinder 40; flow guide passage 401; first flow channel 4011; second flow channel 4012; backflow passage 4013; side plate 41; bottom plate 42; stirring structure 50; first stirring piece 51; second stirring piece 52; cooling structure 61; fin 611; cooling jacket 62; first distance D1; second distance D2.

[0030] The following specific embodiments will further illustrate the present application in combination with the above drawings. Specific embodiments

[0031] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0032] Reference herein to "an embodiment" or "embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment or embodiments can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in various places in the specification are not necessarily all referring to the same embodiment, or are necessarily referring to some particular embodiment, or are mutually exclusive in

[0033] It should be noted that the terms of the specification and claims of the present application and the above-described drawings are only for describing specific embodiments, and are not intended to limit the present application. The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, and are not intended to describe a particular order. The term "and / or" used in the present application refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0034] Please refer to Figure 1 , Figure 1Figure 1 is a sectional view of a pulp making device 100 provided by an embodiment of the present application. The pulp making device 100 comprises a circulating tank 10, a sleeve 20, a dispersion device 30 and a flow guide cylinder 40. The circulating tank 10 is provided with a containing cavity 101 for containing pulp. The circulating tank 10 comprises a top cover 11, a side wall 12 and a bottom wall 13. The circulating tank 10 comprises a top portion 102 and a bottom portion 103 arranged opposite to each other along the extending direction of the central axis C1. After the pulp making device 100 is assembled and installed, the bottom portion 103 of the circulating tank 10 is located on the side of the top portion 102 close to the ground. The top cover 11 is arranged on the top portion 102 of the circulating tank 10. The side wall 12 is fixedly connected to the bottom wall 13. The side wall 12 and the bottom wall 13 enclose the containing cavity 101. The sleeve 20 is arranged on the top portion 102 of the circulating tank 10 and extends into the containing cavity 101. The sleeve 20 is rotatably arranged relative to the circulating tank 10. The dispersion device 30 is installed on the end of the sleeve 20 close to the bottom wall 13 of the circulating tank 10. The dispersion device 30 is provided with an inlet 301 on the side close to the bottom wall 13 of the circulating tank 10. The inlet 301 is in communication with the containing cavity 101. The side wall of the dispersion device 30 is provided with an outlet 302 in communication with the inlet 301. The flow guide cylinder 40 is connected to the dispersion device 30. The inner wall of the flow guide cylinder 40 and the outer wall of the sleeve 20 form a flow guide channel 401. The end of the flow guide channel 401 close to the top portion 102 of the circulating tank 10 is in communication with the containing cavity 101. The end of the flow guide channel 401 close to the bottom wall 13 of the circulating tank 10 is in communication with the outlet 302.

[0035] When the pulping device 100 is pulping, the dispersion device 30 sucks the slurry close to the bottom wall 13 of the circulating tank 10 from the flow inlet 301, the slurry is dispersed by the dispersion device 30 after entering the dispersion device 30, and is discharged from the flow outlet 302, and then enters the flow guide channel 401, flows along the flow guide channel 401, and then flows into the containing cavity 101 from the one end outlet of the flow guide channel 401 close to the top 102 of the circulating tank 10, and flows along the axial direction of the circulating tank 10 to close to the bottom wall 13, so that the slurry forms a circulating flow in the circulating tank 10. In the embodiment of the present application, the sleeve 20, the dispersion device 30 and the flow guide cylinder 40 are arranged in the pulping device 100, so that the slurry is dispersed and circulated in the circulating tank 10. On the one hand, the dispersion device 30 is located in the interior of the circulating tank 10, which greatly shortens the circulation path of the slurry between the dispersion device 30 and the circulating tank 10, effectively improves the slurry circulation efficiency, and reduces the circulation time of the slurry. On the other hand, the dispersion device 30 and the circulating tank 10 do not need to be connected by an additional connecting pipeline, so as to simplify the structure of the pulping device 100, make the structure of the pulping device 100 more compact, facilitate the miniaturization of the pulping device 100, reduce the floor area of the pulping device 100, and reduce the manufacturing cost and installation cost of the pulping device 100. On the other hand, the sleeve 20 is arranged at the top 102 of the circulating tank 10, which is beneficial to separate the circulating tank 10 from other structures of the pulping device 100, thereby greatly reducing the difficulty of cleaning the pulping device 100. The axial direction of the circulating tank 10 is parallel to the center axis C1, the radial direction of the circulating tank 10 is perpendicular to the center axis C1, and the circumferential direction of the circulating tank 10 is perpendicular to the center axis C1 and surrounds the center axis C1.

[0036] Please refer to Figure 1 and Figure 2The dispersion device 30 comprises a first dispersion member 31 and a second dispersion member 32. The second dispersion member 32 is rotatable relative to the first dispersion member 31. The first dispersion member 31 comprises a first disc body 311 and at least one layer of first blocking rings 312. The first disc body 311 is fixedly connected to the flow guide cylinder 40. The first blocking rings 312 are arranged on the side of the first disc body 311 close to the second dispersion member 32. The first blocking rings 312 are provided with first dispersion grooves 3121. The second dispersion member 32 comprises a second disc body 321 and at least one layer of second blocking rings 322. The second disc body 321 is fixed relative to the sleeve 20. The second blocking rings 322 are arranged on the side of the second disc body 321 close to the first dispersion member 31. The second blocking rings 322 are provided with second dispersion grooves 3221. The second blocking rings 322 are located on the inner side and / or the outer side of the first blocking rings 312. The first disc body 311 is provided with a flow inlet 301. The first dispersion grooves 3121 on the outermost first blocking rings 312 or the second dispersion grooves 3221 on the outermost second blocking rings 322 are configured as flow outlets 302. When the second dispersion member 32 rotates relative to the first dispersion member 31, negative pressure is generated near the second blocking rings 322 and the first blocking rings 312, so that the slurry flows into the dispersion device 30 from the flow inlet 301, and the centrifugal force of the second blocking rings 322 and / or the first blocking rings 312 on the slurry causes the slurry to be thrown out of the flow outlets 302. When the slurry flows through the second dispersion grooves 3221 on the second blocking rings 322 and the first dispersion grooves 3121 on the first blocking rings 312, the second blocking rings 322 and the first blocking rings 312 shear and disperse the slurry.

[0037] At least one of the first blocking rings 312 and the second blocking rings 322 is arranged in multiple layers. For example, the second blocking rings 322 are arranged in one layer, the first blocking rings 312 are arranged in two layers, and the second blocking rings 322 are located between the two layers of first blocking rings 312. The first dispersion grooves 3121 on the outermost first blocking rings 312 are configured as flow outlets 302. The slurry flows in from the flow inlet 301 and flows out from the flow outlets 302. In some embodiments, the second blocking rings 322 are arranged on the outermost side of the dispersion device 30. When the second dispersion member 32 rotates, after the slurry is thrown out by the outermost second blocking rings 322, the slurry directly enters the flow guide channel 401, avoiding the first blocking rings 312 from blocking the flow of the slurry, thereby increasing the outflow speed of the slurry and improving the circulation speed.

[0038] The second dispersion member 32 further comprises a pushing blade 323. The pushing blade 323 is arranged on the second disc body 321 and is located inside the second blocking ring 322 which is the innermost part of the dispersion device 30. The pushing blade 323 is fixedly connected with the second disc body 321. The pushing blade 323 and the second disc body 321 can be fixedly connected together by welding, screwing, clamping or the like, or the pushing blade 323 can be integrally formed with the second disc body 321. The pushing blade 323 extends in a spiral shape. In the axial direction of the circulating tank 10, the pushing blade 323 is generally conical. The pushing blade 323 can be a clockwise spiral or a counterclockwise spiral. When the second dispersion member 32 rotates, the pushing blade 323 is used to push the slurry in the axial direction of the circulating tank 10 and the radial direction of the dispersion device 30, so that the slurry flows from the inlet 301 into the dispersion device 30. In some embodiments, the pushing blade 323 can also be arranged on the first disc body 311.

[0039] The sleeve 20 extends in the axial direction of the circulating tank 10. The end of the sleeve 20 close to the bottom wall 13 of the circulating tank 10 is connected with the second dispersion member 32. The end of the flow guide cylinder 40 close to the bottom wall 13 of the circulating tank 10 is connected with the first dispersion member 31.

[0040] The end of the sleeve 20 close to the bottom wall 13 of the circulating tank 10 can be sealingly connected with the second dispersion member 32 to prevent the slurry from entering the connection between the sleeve 20 and the second dispersion member 32 or entering the inside of the sleeve 20. The end of the flow guide cylinder 40 close to the bottom wall 13 of the circulating tank 10 can be sealingly connected with the first dispersion member 31, so that all the slurry entering the flow guide passage 401 passes through the dispersion device 30, thereby improving the uniformity of the slurry and making the slurry evenly dispersed.

[0041] The flow guide cylinder 40 is rotatably arranged relative to the circulating tank 10, and / or the sleeve 20 is rotatably arranged relative to the circulating tank 10. For example, the flow guide cylinder 40 is fixedly arranged relative to the circulating tank 10, and the sleeve 20 is rotatably arranged relative to the circulating tank 10. The first dispersion member 31 is configured as a stator, and the first dispersion member 31 is fixed relative to the circulating tank 10. The second dispersion member 32 is configured as a rotor, and the second dispersion member 32 is rotatable relative to the circulating tank 10. When the sleeve 20 and the second dispersion member 32 rotate relative to the circulating tank 10, the second dispersion member 32 rotates and drives the slurry to rotate. A negative pressure is generated near the second dispersion member 32, so that the slurry is sucked into the inside of the dispersion device 30 from the inlet 301. The centrifugal action of the second dispersion member 32 on the slurry causes the slurry to be thrown out from the outlet 302. The flow guide cylinder 40 can be fixedly connected with the side wall 12 or the top cover 11 of the circulating tank 10 by a support fixing member.

[0042] In some embodiments, the draft tube 40 is rotatably arranged relative to the circulating tank 10, and the sleeve 20 is fixedly arranged relative to the circulating tank 10. The first dispersion member 31 is configured as a rotor, and the first dispersion member 31 is rotatable relative to the circulating tank 10. The second dispersion member 32 is configured as a stator, and the second dispersion member 32 is fixed relative to the circulating tank 10. When the first dispersion member 31 rotates, the pulp is rotated, and a negative pressure is generated near the first dispersion member 31, so that the pulp is sucked into the inside of the dispersion device 30 from the flow inlet 301, and the pulp is thrown out from the flow outlet 302 through the centrifugal action of the first dispersion member 31 on the pulp. In some embodiments, the first disc body 311 is provided with a flow guide portion on the side facing the bottom wall 13, and the flow guide portion is arranged in a spiral shape. The flow guide portion is configured as a spiral protrusion protruding from the side of the first disc body 311 facing the bottom wall 13.

[0043] In some embodiments, the draft tube 40 is rotatably arranged relative to the circulating tank 10, and the sleeve 20 is rotatably arranged relative to the circulating tank 10. The draft tube 40 and the sleeve 20 rotate in opposite directions. The first dispersion member 31 and the second dispersion member 32 are rotatable relative to the circulating tank 10, and rotate in opposite directions. When the first dispersion member 31 and the second dispersion member 32 rotate, the pulp is rotated, and a negative pressure is generated near the first dispersion member 31 and the second dispersion member 32, so that the pulp is sucked into the inside of the dispersion device 30 from the flow inlet 301, and the pulp is thrown out from the flow outlet 302 through the centrifugal action of the first dispersion member 31 and the second dispersion member 32 on the pulp.

[0044] In some embodiments, the pulp making device 100 further comprises a drive shaft 21. The sleeve 20 is hollow. The drive shaft 21 is arranged in the sleeve 20. The end of the drive shaft 21 close to the bottom wall 13 of the circulating tank 10 is connected to the second dispersion member 32 of the dispersion device 30. For example, the drive shaft 21 is rotatably arranged relative to the circulating tank 10. The pulp making device 100 further comprises a driving device, which is in transmission connection with the drive shaft 21 and is used to drive the drive shaft 21 to rotate. In some embodiments, the drive shaft 21 can be fixedly arranged relative to the circulating tank 10, and the end of the sleeve 20 close to the top 102 of the circulating tank 10 can be sealingly connected to the top cover 11.

[0045] In some embodiments, a cooling flow channel is formed between the outer wall of the drive shaft 21 and the inner wall of the sleeve 20. A cooling medium is introduced into the cooling flow channel. The cooling medium is used to cool the drive shaft 21 and the sleeve 20, so as to cool the pulp through the sleeve 20.

[0046] The flow guide passage 401 comprises a first flow channel 4011 and a second flow channel 4012. The second flow channel 4012 is in communication with the first flow channel 4011. The flow guide cylinder 40 comprises a side plate 41 and a bottom plate 42. The side plate 41 is annularly arranged. The side plate 41 extends along the axial direction of the circulating tank 10. The bottom plate 42 extends along the radial direction of the circulating tank 10. The bottom plate 42 is connected to the end of the side plate 41 close to the bottom 103 of the circulating tank 10. In the radial direction of the circulating tank 10, the width of the first disc body 311 is greater than the width of the second disc body 321. The diameter of the first disc body 311 is greater than the diameter of the second disc body 321. The first disc body 311 is located between the second disc body 321 and the bottom wall 13 of the circulating tank 10. The bottom plate 42 is connected to the first dispersion member 31. The connection between the bottom plate 42 and the first dispersion member 31 can be sealed. The first flow channel 4011 is formed between the side plate 41 and the side wall of the sleeve 20. The first flow channel 4011 is in communication with the containing cavity 101. The first flow channel 4011 extends along the axial direction of the circulating tank 10. The second flow channel 4012 is formed between the bottom plate 42 and the end surface of the sleeve 20 close to the bottom wall 13 of the circulating tank 10. The second flow channel 4012 extends along the radial direction of the circulating tank 10. The end of the second flow channel 4012 away from the first flow channel 4011 is in communication with the flow outlet 302. After the slurry flows out of the flow outlet 302, it enters the second flow channel 4012, flows through the first flow channel 4011, and then flows into the containing cavity 101. Exemplarily, the connection between the side plate 41 and the bottom plate 42 is transitioned by a circular arc to reduce or avoid accumulation of the slurry at the connection and its vicinity.

[0047] Exemplarily, the cross-sectional area of the flow guide passage 401 close to the top 102 of the circulating tank 10 is equal to the cross-sectional area of the flow guide passage 401 close to the bottom 103 of the circulating tank 10. The side plate 41 of the flow guide cylinder 40 and the side wall of the sleeve 20 are both configured in a cylindrical shape and coaxially arranged. The central axis of the flow guide cylinder 40 is collinear with the central axis of the sleeve 20. In some embodiments, the cross-sectional area of the flow guide passage 401 close to the top 102 of the circulating tank 10 is greater than the cross-sectional area of the flow guide passage 401 close to the bottom 103 of the circulating tank 10. In this way, when the slurry flows in the flow guide passage 401, the flow rate of the slurry decreases due to the increase of the cross-sectional area of the flow guide passage 401, thereby reducing the surging of the slurry at the liquid surface, avoiding splashing of the slurry, and avoiding air mixing into the slurry. The side plate 41 of the flow guide cylinder 40 can be inclined relative to the bottom plate 42 towards the side wall 12 of the circulating tank 10. The flow area of the first flow channel 4011 can increase linearly. The side plate 41 of the flow guide cylinder 40 can also be curved relative to the bottom plate 42 towards the direction of the side wall 12 of the circulating tank 10. The flow area of the first flow channel 4011 can increase nonlinearly.

[0048] The backflow passage 4013 is formed between the cylinder wall of the flow guide cylinder 40 and the side wall of the circulation tank 10, and is communicated with the first flow channel 4011 and the flow inlet 301. In the radial direction of the circulation tank 10, a first distance D1 between the cylinder wall of the flow guide cylinder 40 and the side wall of the circulation tank 10 is greater than or equal to a second distance D2 between the cylinder wall of the flow guide cylinder 40 and the cylinder wall of the sleeve 20. The first distance D1 can be the distance between the outer side wall of the flow guide cylinder 40 and the inner side wall of the circulation tank 10. The second distance D2 can be the distance between the inner side wall of the flow guide cylinder 40 and the outer side wall of the sleeve 20. Exemplarily, the first distance D1 is greater than the second distance D2. The flow area of the first flow channel 4011 is greater than the flow area of the backflow passage 4013. In this way, the volume of the first flow channel 4011 is less than the volume of the backflow passage 4013, so that the slurry has a greater flow rate in the first flow channel 4011, thereby avoiding the accumulation of the slurry in the first flow channel 4011, reducing the discharge resistance when the dispersion device 30 discharges the slurry, and making the liquid level of the slurry at the outlet of the first flow channel 4011 higher than the liquid level of the slurry at the backflow passage 4013, which is conducive to accelerating the outflow of the slurry from the flow guide passage 401 to the backflow passage 4013, accelerating the flow of the slurry in the backflow passage 4013 towards the dispersion device 30, and promoting the circulation of the slurry in the circulation tank 10. In some embodiments, the first distance D1 can be equal to the second distance D2.

[0049] The ratio of the first distance D1 and the second distance D2 is 1-10. In this way, the height difference between the liquid level of the slurry at the outlet of the first flow channel 4011 and the liquid level of the slurry at the backflow passage 4013 is within a suitable range, which on the one hand is conducive to promoting the circulation of the slurry in the circulation tank 10, and on the other hand can avoid the formation of splashes on the liquid surface of the slurry and the mixing of air into the slurry to form bubbles. The specific ratio of the first distance D1 and the second distance D2 can be specifically set according to actual needs, which is not limited in the present application. For example, the ratio of the first distance D1 and the second distance D2 can be 1, 1.5, 2, 3, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, etc.

[0050] The ratio of the distance between the opening of the flow guide channel 401 close to one side of the top 102 of the circulating tank 10 and the bottom wall 13 of the circulating tank 10 and the distance between the liquid level of the slurry and the bottom wall 13 of the circulating tank 10 is 0.8-3. In this way, the height difference between the liquid level at the outlet of the flow guide channel 401 and the liquid level at the backflow channel 4013 due to the flow inertia of the slurry is within a suitable range, on the one hand, it is beneficial to accelerate the flow of the slurry from the flow guide channel 401 into the backflow channel 4013, promote the circulation of the slurry in the circulating tank 10, on the other hand, it can avoid the splashing of the slurry on the liquid level, avoid the mixing of air into the slurry to form bubbles, and on the other hand, it is beneficial to avoid the accumulation of the slurry in the flow guide channel 401, and it is beneficial to make the slurry flowing out of the flow guide channel 401 cover the original slurry in the backflow channel 4013, thereby pushing the slurry in the backflow channel 4013 to flow towards the dispersing device 30, enabling the slurry in the containing cavity 101 to enter the dispersing device 30, thereby improving the dispersing effect of the slurry and improving the quality of the slurry. The opening of the flow guide channel 401 close to one side of the top 102 of the circulating tank 10 can be the end of the side plate 41 away from the bottom plate 42. The liquid level of the slurry can be the liquid level formed by the slurry contained in the circulating tank 10 within the rated capacity range of the circulating tank 10. The distance between the bottom wall 13 of the circulating tank 10 and the liquid level of the slurry refers to the distance between the position of the bottom wall 13 close to the dispersing device 30 and the liquid level in the circulating tank 10 along the axial direction of the circulating tank 10 when the slurry in the circulating tank 10 is in a static state. The distance between the end of the side plate 41 away from the bottom plate 42 and the bottom wall 13 of the circulating tank 10 refers to the distance between the end of the side plate 41 away from the bottom plate 42 and the position of the bottom wall 13 of the circulating tank 10 close to the dispersing device 30. The ratio of the distance between the end of the side plate 41 away from the bottom plate 42 and the bottom wall 13 of the circulating tank 10 and the distance between the liquid level of the slurry and the bottom wall 13 of the circulating tank 10 can be specifically set according to actual needs, which is not specifically limited in the present application. Exemplarily, the ratio of the distance between the end of the side plate 41 away from the bottom plate 42 and the bottom wall 13 of the circulating tank 10 and the distance between the liquid level of the slurry and the bottom wall 13 of the circulating tank 10 can be 0.8, 0.9, 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2, 2.2, 2.4, 2.5, 2.6, 2.8, 3, etc. In some embodiments, the end of the side plate 41 away from the bottom plate 42 can be located on the side of the liquid level of the slurry away from the bottom wall 13 of the circulating tank 10. That is, the end of the side plate 41 away from the bottom plate 42 is located above the liquid level.

[0051] The ratio of the interval distance between the draft tube 40 and the bottom wall 13 of the circulating tank 10 and the diameter of the flow inlet 301 is greater than 0.3. In this way, on the one hand, the pulp can be prevented from depositing near the bottom wall 13, which is beneficial to the dispersion device 30 fully inhaling the pulp near the bottom wall 13, improves the dispersion uniformity of the pulp, and improves the pulping efficiency of the pulping equipment 100. On the other hand, the distance between the flow inlet 301 of the dispersion device 30 and the bottom wall 13 can be prevented from being too small, so that the flow resistance of the pulp flowing from the backflow channel 4013 to the flow inlet 301 is too large, which leads to insufficient suction efficiency of the dispersion device 30 and reduces the pulping efficiency of the pulping equipment 100. The interval distance between the draft tube 40 and the bottom wall 13 of the circulating tank 10 can be specifically set according to actual needs, which is not specifically limited in the present application. The ratio of the interval distance between the draft tube 40 and the bottom wall 13 of the circulating tank 10 and the diameter of the flow inlet 301 can be specifically set according to actual needs, which is not specifically limited in the present application. Exemplarily, the ratio of the interval distance between the draft tube 40 and the bottom wall 13 of the circulating tank 10 and the diameter of the flow inlet 301 can be 0.3, 0.35, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, etc.

[0052] In some embodiments, the end of the draft tube 40 away from the bottom 103 of the circulating tank 10 is inclined or curved toward the direction away from the sleeve 20. For example, the end of the draft tube 40 away from the bottom 103 of the circulating tank 10 can be in the shape of an inverted truncated cone, or can be in the shape of a horn, etc. Among them, when the pulp flows in the draft flow channel 401, due to the wall attachment effect of the pulp, the draft tube 40 plays a guiding role on the pulp, and the pulp will flow along the extension direction of the side plate 41 of the draft tube 40. The end of the draft tube 40 is inclined or curved toward the direction away from the sleeve 20, and through the guiding effect of the draft tube 40 on the pulp, the flow direction of the pulp when flowing out of the opening of the draft tube 40 can form an angle with the axial direction of the circulating tank 10, thereby reducing the splashing height of the pulp at the opening of the draft tube 40, and avoiding the pulp from splashing.

[0053] Please refer to Figure 3In some embodiments, the pulp preparation device 100 further comprises a baffle 22. The baffle 22 is arranged on the side wall of the sleeve 20 and is located on the side of the draft tube 40 away from the bottom 103 of the circulating tank 10. The baffle 22 extends along the radial direction of the sleeve 20. In the plane perpendicular to the central axis C1 of the circulating tank 10, the orthographic projection of the baffle 22 at least partially covers the outlet of the draft passage 401 on the side close to the top 102 of the circulating tank 10. The baffle 22 is used to shield the pulp overflowing at the outlet of the draft passage 401, so as to avoid the pulp splashing on the sleeve 20 and make the pulp flow into the position between the draft tube 40 and the side wall 12, so as to make the pulp preparation device 100 fully circulate and disperse the pulp, improve the accuracy of the pulp ratio, and avoid the air being mixed into the pulp after the pulp splashing. Exemplarily, the baffle 22 can be located above the liquid level of the pulp.

[0054] In some embodiments, at least one of the two surfaces of the baffle 22 opposite in the axial direction of the sleeve 20 is inclined or curved towards the bottom 103 of the circulating tank 10, so that the pulp falling on the baffle 22 can slide under the action of gravity to the position between the draft tube 40 and the side wall 12, avoiding the pulp accumulating on the baffle 22. The baffle 22 can be arranged inclined or curved towards the bottom 103 of the circulating tank 10 relative to the sleeve 20. The extension length of the baffle 22 along the radial direction of the circulating tank 10 is greater than or equal to the width of the outlet of the draft passage 401 on the side close to the top 102 along the radial direction of the circulating tank 10, so as to facilitate the pulp sliding from the baffle 22 to the position between the draft tube 40 and the side wall 12. In some embodiments, the two surfaces of the baffle 22 opposite in the axial direction of the sleeve 20 can also be arranged in a plane, so as to reduce the processing difficulty of the baffle 22.

[0055] In some embodiments, the baffle 22 can be arranged as one. The baffle 22 can be arranged in a ring shape, and in the plane perpendicular to the central axis C1 of the circulating tank 10, the orthographic projection of the baffle 22 covers the outlet of the draft passage 401 on the side close to the top 102 of the circulating tank 10. In some embodiments, the baffle 22 can be arranged as multiple baffles 22, and the multiple baffles 22 are arranged along the circumferential direction of the sleeve 20.

[0056] Please refer to Figure 4In some embodiments, the baffle 22 comprises a plurality of first plate bodies 221 and a plurality of second plate bodies 222. The second plate bodies 222 are located on the side of the first plate bodies 221 away from the bottom wall 13 of the circulating tank 10. The plurality of first plate bodies 221 and the plurality of second plate bodies 222 are arranged alternately along the circumferential direction of the sleeve 20. In a plane perpendicular to the central axis C1 of the circulating tank 10, the orthographic projection of the plurality of first plate bodies 221 and the orthographic projection of the plurality of second plate bodies 222 overlap to form a complete annular shape. In this way, the splashing slurry can be effectively shielded, and the splashing of the slurry onto the side wall of the sleeve 20 can be avoided. In addition, when the sleeve 20 is cleaned, the slurry remaining at the connection between the first plate body 221 and the sleeve 20 and the connection between the second plate body 222 and the sleeve 20 can be easily removed, and the cleaning efficiency can be improved.

[0057] For reference Figure 1 and Figure 5 In some embodiments, the outer wall of the sleeve 20 and / or the inner wall of the flow guide cylinder 40 is provided with a flow guide structure 23. The flow guide structure 23 extends in a spiral shape. When the slurry flows along the flow guide channel 401, the flow guide structure 23 is used to guide the slurry to flow spirally along the circumferential direction of the sleeve 20, so that when the slurry flows out of the outlet of the first flow channel 4011, the flow direction of the slurry forms an acute angle with the axial direction of the sleeve 20, thereby reducing the turbulence of the slurry at the liquid surface, reducing or avoiding the adhesion of the slurry to the side wall of the sleeve 20, and fully circulating and dispersing the slurry to improve the accuracy of the slurry ratio. In addition, when the sleeve 20 provided with the flow guide structure 23 and / or the flow guide cylinder 40 provided with the flow guide structure 23 rotates, the flow guide structure 23 can also be used to push the slurry to flow towards the outlet of the first flow channel 4011, so as to improve the flow speed of the slurry and improve the circulating efficiency.

[0058] The flow guide structure 23 can be configured as a spiral protrusion and / or a spiral groove. The flow guide structure 23 can be configured as a spiral protrusion. The spiral protrusion can also improve the structural strength of the flow guide cylinder 40 and / or the sleeve 20, and avoid deformation of the flow guide cylinder 40 and / or the sleeve 20. In some embodiments, the flow guide structure 23 can be configured as a spiral groove. In some embodiments, the flow guide structure 23 can be configured as a combination of a spiral protrusion and a spiral groove, for example, the flow guide structure 23 comprises a plurality of flow guide structures, wherein a part of the flow guide structures 23 are configured as spiral protrusions, and another part of the flow guide structures 23 are configured as spiral grooves.

[0059] In some embodiments, the flow guide structure 23 can be arranged on the side of the side plate 41 of the flow guide cylinder 40 facing the sleeve 20. In some embodiments, the flow guide structure 23 can also be arranged on the side of the bottom plate 42 of the flow guide cylinder 40 facing the sleeve 20. In some embodiments, the flow guide structure 23 can also be arranged on the side of the sleeve 20 facing the side plate 41 and / or the side of the sleeve 20 facing the bottom plate 42.

[0060] Please refer to Figure 6 In some embodiments, the pulp preparation device 100 further comprises a stirring structure 50. The stirring structure 50 is arranged on the top of the circulating tank 10 or on the sleeve 20. The stirring structure 50 is used to stir the pulp to improve the mixing uniformity of the pulp. Exemplarily, the stirring structure 50 is connected to the side wall of the sleeve 20. The stirring structure 50 comprises a plurality of first stirring pieces 51. The plurality of first stirring pieces 51 are arranged at intervals along the axial direction of the sleeve 20. The number of the first stirring pieces 51 can be 2, 3, 4, etc.

[0061] The first stirring piece 51 extends into the backflow channel 4013. The first stirring piece 51 is arranged at intervals with the flow guide cylinder 40. The first stirring piece 51 comprises a first stirring section and a second stirring section connected to the first stirring section. The first stirring section extends along the radial direction of the sleeve 20. The second stirring section extends along the axial direction of the sleeve 20 and extends into the backflow channel 4013. In some embodiments, the first stirring section and / or the second stirring section can be arranged in a spiral shape along the circumferential direction of the sleeve 20 to reduce the rotational resistance of the first stirring piece 51.

[0062] In some embodiments, the stirring structure 50 further comprises a second stirring piece 52. The second stirring piece 52 is connected to the second stirring section. The second stirring piece 52 extends along the radial direction of the sleeve 20. The second stirring piece 52 is arranged in a plurality, and the plurality of second stirring pieces 52 are arranged at intervals along the axial direction of the sleeve 20. The second stirring piece 52 is used to increase the contact area of the stirring structure 50 with the pulp, and improve the stirring effect of the stirring structure 50 on the pulp.

[0063] Please refer to Figure 7 In some embodiments, the pulp preparation device 100 further comprises an extension plate 121. The extension plate 121 is arranged on the side wall 12 of the circulating tank 10 and extends along the radial direction of the circulating tank 10. The extension plate 121 is arranged in a plurality, and the plurality of extension plates 121 are arranged at intervals along the axial direction of the circulating tank 10. The second stirring piece 52 is located on the side of the second stirring section away from the sleeve 20. Along the axial direction of the circulating tank 10, the plurality of second stirring pieces 52 and the plurality of extension plates 121 are arranged alternately. When the sleeve 20 drives the second stirring piece 52 to rotate through the first stirring piece 51, the second stirring piece 52 and the extension plate 121 form shearing on the pulp, thereby improving the mixing uniformity of the pulp. In some embodiments, the flow guide cylinder 40 is provided with an extension plate 121. The extension plate 121 is located on the side of the side plate 41 facing the side wall 12 of the circulating tank 10. The side of the second stirring section close to the sleeve 20 is provided with the second stirring piece 52.

[0064] The arrangement direction of the plurality of extension plates 121 can be parallel to the axial direction of the circulating tank 10, so as to reduce the installation difficulty of the extension plates 121. In some embodiments, the plurality of extension plates 121 are arranged in a spiral shape along the axial direction of the circulating tank 10. In this way, when the sleeve 20 drives the second stirring member 52 to rotate, the plurality of second stirring members 52 meet the extension plates 121 in sequence, so as to avoid the plurality of second stirring members 52 from meeting the plurality of extension plates 121 at the same time, thereby avoiding the plurality of second stirring members 52 from shearing the slurry together with the plurality of extension plates 121, reducing the reaction force of the slurry on the second stirring member 52, and reducing the rotating resistance of the stirring structure 50.

[0065] In some embodiments, the pulping device 100 further comprises a cooling structure 61. The cooling structure 61 is connected to the top cover 11 and at least partially extends into the containing cavity 101. The cooling structure 61 extends into the backflow channel 4013 and is immersed in the slurry. The cooling structure 61 is used to cool the slurry, so that the temperature of the slurry is maintained within a preset temperature range, so as to improve the quality of the slurry. The cooling structure 61 is provided with a heat dissipation channel. The heat dissipation channel is provided with a circulating heat dissipation medium. Part of the cooling structure 61 is located inside the circulating tank 10, and the other part is located outside the circulating tank 10. When the heat dissipation medium flows in the heat dissipation channel, it can take away the heat of the slurry to the outside of the circulating tank 10.

[0066] The cooling structure 61 can be configured as a heat pipe or a cooling circulation pipe. For example, the cooling structure 61 is configured as a heat pipe. The heat dissipation channel is arranged in the heat pipe. The heat dissipation channel includes a capillary channel. The heat pipe includes a first segment and a second segment. The first segment is located in the containing cavity 101. The second segment is connected to the first segment and is located outside the circulating tank 10. The first segment is immersed in the slurry. After absorbing the heat of the slurry, the heat dissipation medium in the first segment vaporizes and flows to the second segment along the heat dissipation channel. The vaporized heat dissipation medium condenses into a liquid state in the second segment. The liquid state heat dissipation medium flows back to the first segment due to capillary action. The heat dissipation medium reciprocates between the first segment and the second segment, thereby achieving heat dissipation of the slurry. In this way, the cooling structure 61 can spontaneously drive the circulation of the heat dissipation medium in the heat dissipation channel through the temperature difference between the slurry and the external environment, thereby avoiding the need for additional driving structures, reducing the power consumption of the pulping device 100, and reducing the use cost of the pulping device 100. For example, the boiling point of the heat dissipation medium can be configured as 25-55℃. For example, the boiling point of the heat dissipation medium can be 25℃, 26℃, 30℃, 35℃, 61℃, 55℃, etc. In some embodiments, the cooling structure 61 is provided with fins 611 to increase the heat conduction area and improve the heat dissipation capacity.

[0067] In some embodiments, the circulating tank 10 is provided with a cooling jacket 62. The cooling jacket 62 wraps the side wall 12 and / or the bottom wall 13. Cooling medium is introduced into the cooling jacket 62 to cool the side wall 12 and / or the bottom wall 13 by the cooling medium, so as to dissipate heat from the slurry through the side wall 12 and / or the bottom wall 13.

[0068] In some embodiments, the pulping device 100 further comprises a feeding structure. The top cover 11 is provided with a feeding port. The feeding structure is connected to the feeding port. The feeding structure is configured to feed solid material into the circulating tank 10. The feeding structure can be configured as a double screw feeding mechanism. In some embodiments, the pulping device 100 further comprises a liquid feeding structure. The top cover 11 is provided with a liquid feeding port. The liquid feeding structure comprises a liquid feeding pipe. The liquid feeding pipe is arranged in the liquid feeding port and extends into the accommodating cavity 101. The opening of the liquid feeding pipe in the accommodating cavity 101 is arranged towards the side wall 12 of the circulating tank 10, so that when the liquid feeding pipe feeds liquid material into the circulating tank 10, the liquid material will flow down along the side wall 12, thereby reducing the impact force of the liquid material on the liquid surface, reducing or avoiding splashing of the liquid material, and avoiding gas mixing into the liquid material. In some embodiments, the bottom wall 13 is provided with a discharge port 131 communicating with the accommodating cavity 101. The discharge port 131 is arranged close to the position of the dispersing device 30, so as to improve the discharge speed of the slurry from the discharge port 131 and improve the discharge efficiency.

[0069] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements shall be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A pulping plant (100) characterized in that, The application relates to a circulating tank (10) provided with a containing cavity (101) for containing slurry; a sleeve (20) arranged at the top (102) of the circulating tank (10) and extending into the containing cavity (101), the sleeve (20) extending along the axial direction of the circulating tank (10); a dispersing device (30) arranged at the end of the sleeve (20) close to the bottom (103) of the circulating tank (10), the dispersing device (30) being provided with a flow inlet (301) on the side close to the bottom (103) of the circulating tank (10), the flow inlet (301) being in communication with the containing cavity (101), the side wall of the dispersing device (30) being provided with a flow outlet (302) in communication with the flow inlet (301), the dispersing device (30) comprising a first dispersing member (31) and a second dispersing member (32), the second dispersing member (32) being rotatable relative to the first dispersing member (31), the end of the sleeve (20) close to the bottom (103) of the circulating tank (10) being connected with the second dispersing member (32); a flow guide cylinder (40) connected with the dispersing device (30), the inner wall of the flow guide cylinder (40) and the outer wall of the sleeve (20) forming a flow guide channel (401), one end of the flow guide channel (401) close to the top (102) of the circulating tank (10) being in communication with the containing cavity (101), the end of the flow guide channel (401) close to the bottom (103) of the circulating tank (10) being in communication with the flow outlet (302), the end of the flow guide cylinder (40) close to the bottom (103) of the circulating tank (10) being connected with the first dispersing member (31). The cross-sectional area of the flow guide channel (401) close to the top (102) of the circulating tank (10) is greater than or equal to the cross-sectional area of the flow guide channel (401) close to the bottom (103) of the circulating tank (10). The flow guide channel (401) comprises a first flow channel (4011) and a second flow channel (4012) in communication with the first flow channel (4011), the flow guide cylinder (40) comprises a side plate (41) extending along the axial direction of the circulating tank (10) and a bottom plate (42) connected to the end of the side plate (41) close to the bottom (103) of the circulating tank (10), the side plate (41) and the side wall of the sleeve (20) form the first flow channel (4011), the bottom plate (42) extends along the radial direction of the circulating tank (10), the first flow channel (4011) is in communication with the containing cavity (101), the bottom plate (42) is connected with the first dispersing member (31), the bottom plate (42) and the end face of the sleeve (20) close to the bottom (103) of the circulating tank (10) form the second flow channel (4012), the end of the second flow channel (4012) away from the first flow channel (4011) is in communication with the flow outlet (302). ​ ​ 2. The pulping apparatus (100) according to claim 1, characterized in that ​ 3. The pulping apparatus (100) according to claim 1, characterized in that ​ 4. The pulping apparatus (100) according to claim 1, characterized in that The pulping device (100) further comprises a driving shaft (21) disposed in the sleeve (20), and an end of the driving shaft (21) close to the bottom (103) of the circulating tank (10) is connected with the dispersing device (30).

5. The pulping apparatus (100) according to claim 1, characterized in that An end of the draft tube (40) away from the bottom (103) of the circulating tank (10) is inclined or curved away from the sleeve (20).

6. The pulping apparatus (100) according to claim 1, characterized in that The dispersing device (30) comprises a first dispersing member (31) and a second dispersing member (32), the second dispersing member (32) is rotatably disposed relative to the first dispersing member (31), the first dispersing member (31) comprises a first disc body (311) and at least one first blocking ring (312), the first disc body (311) is fixedly connected with the draft tube (40), the flow inlet (301) is formed in the first disc body (311), the first blocking ring (312) is disposed on a side of the first disc body (311) close to the second dispersing member (32), and a first dispersing groove (3121) is formed in the first blocking ring (312); The second dispersing member (32) comprises a second disc body (321) and at least one second blocking ring (322), the second disc body (321) is fixed relative to the sleeve (20), the second blocking ring (322) is disposed on a side of the second disc body (321) close to the first dispersing member (31), and a second dispersing groove (3221) is formed in the second blocking ring (322), the first blocking ring (312) is located on the inner side and / or the outer side of the second blocking ring (322), and the first dispersing groove (3121) or the second dispersing groove (3221) located on the outermost side of the dispersing device (30) is configured as the flow outlet (302).

7. The pulping apparatus (100) according to claim 6, characterized in that The dispersing device (30) further comprises a pushing blade (323) disposed on the first disc body (311) or the second disc body (321), and the pushing blade (323) is used for pushing the slurry along the radial direction of the dispersing device (30).

8. The pulping apparatus (100) according to claim 1, characterized in that The draft tube (40) is rotatably disposed relative to the circulating tank (10), and / or the sleeve (20) is rotatably disposed relative to the circulating tank (10).

9. The pulping apparatus (100) according to claim 1, characterized in that The pulping device (100) further comprises a baffle (22) disposed on the sleeve (20) and located on a side of the draft tube (40) away from the bottom (103) of the circulating tank (10), and in a plane perpendicular to the central axis (C1) of the sleeve (20), the orthographic projection of the baffle (22) at least partially covers the outlet of the draft flow passage (401) close to the top (102) of the circulating tank (10).

10. The pulping apparatus (100) according to claim 1, characterized in that In the radial direction of the circulating tank (10), the first distance (D1) between the cylinder wall of the draft tube (40) and the bottom (103) of the circulating tank (10) is greater than or equal to the second distance (D2) between the cylinder wall of the draft tube (40) and the cylinder wall of the sleeve (20).

11. The pulping apparatus (100) according to claim 10, characterized in that The ratio of the first distance (D1) and the second distance (D2) is 1-10.

12. The pulping apparatus (100) according to claim 1, characterized in that The ratio of the distance between the opening of the flow guide channel (401) near one side of the top (102) of the circulating tank (10) and the bottom (103) of the circulating tank (10) and the distance between the liquid level of the slurry and the bottom (103) of the circulating tank (10) is 0.8-3.

13. The pulping apparatus (100) according to claim 1, characterized in that The ratio of the interval distance between the flow guide cylinder (40) and the bottom (103) of the circulating tank (10) and the diameter of the flow inlet (301) is greater than 0.

3.

14. The pulping apparatus (100) according to claim 1, characterized in that The pulping device (100) further comprises a stirring structure (50) arranged on the top (102) of the circulating tank (10) or on the sleeve (20), and the stirring structure (50) is used for stirring the slurry.

15. The pulping apparatus (100) according to claim 1, characterized in that The pulping device (100) further comprises a cooling structure (61) arranged on the top (102) of the circulating tank (10) and extending into the containing cavity (101), and the cooling structure (61) is used for cooling the slurry.

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