Low-resistance efficient dynamic separator

Abstract

The utility model relates to a low-resistance efficient dynamic separator which comprises an outer shell, a separation space is formed in the outer shell, a top cover is arranged on the top of the outer shell, a motor and a speed reducer are connected to the top of the top cover, and the output ends of the motor and the speed reducer are connected with a transmission shaft extending towards the interior of the separation space in a sealed mode. A powder inlet pipe and a powder return pipe are arranged at the bottom of the separation space, an air suction rotor is connected to the lower portion of the transmission shaft, a plurality of stationary blades are evenly distributed in the circumferential direction of the bottom end of the top cover, and the bottom ends of the stationary blades are suspended ends and distributed above the air suction rotor; an inner cone is correspondingly arranged below the air suction rotor, and a plurality of axial blades are distributed in the circumferential direction of the inner cone; the air suction rotor rotates to generate centrifugal force, an air exhaust trend is formed around the air suction rotor, and air is sucked from the bottom of the air suction rotor. The utility model mainly adopts centrifugal separation, solves the problem of mutual interference between fed powder and returned powder in the original rotor area, realizes perfect separation of fed powder and returned powder, and simultaneously solves the problem of short circuit of pulverized coal.

Description

Technical Field

[0001] The utility model relates to the technical field of powder milling, and more specifically, to a low-resistance and high-efficiency dynamic separator. Background Art

[0002] The cylinder body of the ball mill and the pulverized coal separator are separated. Raw coal is milled in the cylinder body of the ball mill, and primary air carries the milled pulverized coal from the cylinder body into the separator through the coal inlet pipe. In the separator, the pulverized coal is separated into fine and coarse powders. The pulverized coal with qualified fineness is continuously carried by the primary air and discharged from the separator, while the unqualified coarse powder returns to the cylinder body through the return powder pipe for re-milling.

[0003] The structure of the traditional dynamic and static combined separator is shown in Figure 1 , the bearing seat 101 is fixed on the top cover 102, the transmission shaft 103 passes through the bearing seat 101, the upper end of the transmission shaft 103 is connected to the motor and the speed reducer 104, and the lower end of the transmission shaft 103 is connected to the rotor 105. The motor and the speed reducer 104 are fixed on the bearing seat 101, and the transmission shaft 103 can rotate in the bearing seat 101. The motor drives the rotor 105 to rotate through the speed reducer and the transmission shaft 103. 32 axial blades 106 are evenly distributed in the circumferential direction in the annular channel between the outer shell 107 and the inner cone 108, and the angle of each axial blade 106 can be adjusted through the blade shaft 1061. 32 static blades 109 are also evenly distributed in the circumferential direction outside the inner cone 108, the upper end of the static blade 109 is connected to the top cover 102, and the lower end is connected to the inner cone 108.

[0004] The air-powder mixture H enters the separator from the coal inlet pipe 110, rises in the annular channel between the outer shell 107 and the inner cone 108, and the axial blade 106 guides the air-powder mixture H to rotate and rise. The air-powder mixture H reaches the upper part of the separator, passes through the static blade 109, and meets the rotating rotor 105. The rotor blades impact the pulverized coal particles, causing the pulverized coal particles to spread towards the periphery of the rotor. Since the primary air has a stronger carrying capacity for fine powder than for coarse powder, the fine pulverized coal is more easily carried by the primary air through the rotor 105 and discharged from the separator, while the coarse pulverized coal is separated from the primary air, falls downward into the return powder pipe 111, and finally returns to the cylinder body for re-milling. By adjusting the rotation speed of the rotor 105, the fineness of the pulverized coal passing through the rotor can be controlled, thereby realizing the real-time adjustment of the fineness of the pulverized coal discharged from the separator.

[0005] The above-mentioned traditional dynamic and static combined separator uses the collision between the rotor blades and the pulverized coal particles when the rotor rotates for the separation of fine and coarse powders. This collision separation method has the following disadvantages:

[0006] 1. The rotor blades are severely worn and the rotor has a short service life

[0007] When pulverized coal particles encounter the rotating rotor blades, they directly cause erosion and wear on the surface of the rotor blades. The faster the rotation speed, the more severe the wear.

[0008] 2. There is a phenomenon of pulverized coal short - circuit, resulting in poor pulverized coal uniformity.

[0009] There is a clearance L between the rotating rotor 105 and the top cover 102, as shown in Figure 3 , in order to avoid rubbing or jamming between the rotor 105 and the top cover 102, usually this clearance L is between 5 - 10 mm. In this way, a part of the air - powder mixture bypasses the rotor and is directly discharged from the separator, resulting in an increase in the proportion of large - particle pulverized coal in the pulverized coal discharged from the separator and poor pulverized coal uniformity.

[0010] 3. The resistance of the separator is large.

[0011] From the structure diagram of the rotor and Figure 2 it can be seen that when the rotor 105 rotates, the gas between the rotor blades will rotate with the rotor, and the rotation direction is Z1. Due to the action of centrifugal force, the gas between the rotor blades is discharged to the periphery, as shown by the Z2 arrow direction in the figure. Thus, there is a tendency to suck air from the top of the rotor, as shown in the Z3 position in the figure, and discharge air from the periphery of the rotor. This tendency is opposite to the flow direction of the air - powder mixture in the separator. Therefore, the rotation of the rotor causes additional resistance to the flow of the air - powder mixture in the separator, and the air - powder mixture must overcome this resistance to enter the rotor.

[0012] 4. The separation efficiency is low and the pulverized coal uniformity is poor.

[0013] The periphery of the rotor is both the channel for the air - powder mixture to enter the rotor and the return powder channel for the coarse pulverized coal particles blocked by the rotor. In this area, the pulverized coal entering the rotor and the returned coarse pulverized coal interfere with each other. The fine pulverized coal that should enter the rotor is interfered and does not enter the rotor, resulting in low separation efficiency. On the other hand, the coarse pulverized coal that has been blocked by the rotor is interfered by the air - powder mixture entering the rotor and re - enters the rotor, resulting in poor pulverized coal uniformity.

[0014] Therefore, how to provide a dynamic separator to solve the above problems is an urgent problem for those skilled in the art. Utility Model Content

[0015] For this reason, the purpose of the present utility model is to propose a low - resistance and high - efficiency dynamic separator to solve the deficiencies existing in the separation of coarse and fine pulverized coal by the static - dynamic combined separator when the rotor rotates and the rotor blades collide with pulverized coal particles.

[0016] The technical solution of the present utility model is a low-resistance and high-efficiency dynamic separator, which includes: an outer housing, a separation space is formed inside the outer housing, the top of which is a top cover, a motor and a speed reducer are connected to the top of the top cover, and the output end of the motor and the speed reducer is hermetically connected to a transmission shaft extending into the separation space, the top of the top cover has a powder outlet pipe communicating with the separation space, and the bottom of the separation space has a powder inlet pipe and a powder return pipe.

[0017] It further includes an air suction rotor, the lower part of the transmission shaft is connected with the air suction rotor, a plurality of static blades are evenly distributed in the circumferential direction at the bottom end of the top cover, the bottom end of the static blade is a suspended end and is distributed above the air suction rotor;

[0018] An inner cone, an inner cone corresponds to the lower part of the air suction rotor, and a plurality of axial blades are distributed in the circumferential direction of the inner cone;

[0019] Wherein, the air suction rotor rotates to generate centrifugal force, forming an exhaust trend in its surrounding direction and sucking air at its bottom.

[0020] According to the technical solution of the present utility model, the air suction rotor includes:

[0021] A central tube, the central tube is connected with the transmission shaft; an upper cone and a lower cone are sequentially connected to the central tube from top to bottom, and the upper cone and the lower cone are connected as a whole to form a structure with a top inclined downward and a bottom inclined upward;

[0022] Rotor blades, a plurality of rotor blades are evenly distributed in the circumferential direction at the top of the structure and facing downward;

[0023] A ring, the bottom of the rotor blade is connected with a ring;

[0024] Wherein, the ring is the inlet of the air suction rotor, and the rotor blade, the lower cone and the ring form an outlet.

[0025] According to the technical solution of the present utility model, the number of the outlets is one less than the number of the rotor blades.

[0026] According to the technical solution of the present utility model, the inner cone is located directly above the powder inlet pipe and forms an annular channel with the outer housing, and a plurality of the axial blades are located in the annular channel, and the axial blades adjust the angle through a blade shaft.

[0027] According to the technical solution of the present utility model, the inner cone is sequentially connected with: a top cone section, a middle cone section, a lower cone section and a bottom plate from top to bottom to form a cone structure with a smaller bottom and a larger top, and the middle cone section is connected with the axial blade.

[0028] According to the technical solution of the present utility model, a spiral rising section of the air-powder mixture is formed from the powder inlet pipe to the axial blades and the middle cone section, and a section of bottom suction and side throwing of the suction rotor is formed from the top cone section to the suction rotor; a rotating flow field is formed between the outer periphery of the suction rotor and the inner wall of the housing body to separate large-particle coal powder, and the section from the housing body downward to the return powder pipe is a return section of the large-particle coal powder, and the section from the top of the rotating flow field, the static blades to the powder outlet pipe is a powder outlet section.

[0029] It can be seen from the above technical solutions that, compared with the prior art, the present utility model has the following beneficial effects:

[0030] In the present utility model, the suction rotor is located between the static blades and the inner cone. This arrangement changes the flow field of the separator, thus changing the traditional separation mainly by collision to mainly by centrifugal separation in the present utility model.

[0031] The present utility model has high separation efficiency

[0032] For the traditional static-dynamic combined separator, the periphery of the rotor is both the powder inlet channel and the powder return channel. The powder inlet and powder return interfere with each other, resulting in low separation efficiency. The present utility model solves this problem. The inlet at the bottom of the suction rotor is the powder inlet channel. The air-powder mixture enters the rotor interior from the inlet, is carried and rotated by the blades, and then is discharged from the outlet at the periphery of the rotor into the rotating flow field between the suction rotor and the housing body. The coal powder undergoes centrifugal separation in this rotating flow field. The large-particle coal powder has a large centrifugal force and is thrown to the inner wall of the housing body and returns downward along the inner wall to the return powder pipe, while the fine coal powder is carried by the primary air and continues to move upward. Since the problem of interference between the powder inlet and powder return is solved, the separation efficiency is significantly improved.

[0033] The separator of the present utility model has low resistance

[0034] Due to the special structure of the suction rotor, there is a tendency to suck air from the bottom of the rotor and exhaust air from the periphery of the rotor during rotation. This tendency is consistent with the flow tendency of the air-powder mixture in the separator, so it will not cause resistance to the flow of the air-powder mixture, thereby reducing the resistance of the separator.

[0035] The rotor blades of the present utility model have small wear and the rotor has a long service life

[0036] For the traditional static-dynamic combined separator, the rotor realizes the separation of coarse and fine powder by colliding with coal powder particles, so the scouring and wear of the coal powder on the blades are very serious. The rotor of the present utility model carries the air-powder mixture to form a rotating flow field between the rotor and the housing body and uses the centrifugal separation method to realize the separation of coarse and fine powder. The relative speed when the coal powder contacts the blades is much lower than that of the traditional rotor, so the wear of the rotor blades is significantly reduced and the service life of the rotor is significantly extended.

[0037] The coal powder of the present utility model has better uniformity

[0038] When the air suction rotor rotates, a rotating flow field is formed between the outer housing and the air suction rotor. Whether the air-powder mixture passes through the rotor or bypasses the rotor, it inevitably has to pass through the rotating flow field and will surely undergo centrifugal separation within the rotating flow field. Therefore, there is no phenomenon of pulverized coal short-circuit, and the uniformity of the pulverized coal is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0040] Figure 1 It is a schematic diagram of a traditional static-dynamic combined separator;

[0041] Figure 2 It is a schematic diagram of the rotor structure of a traditional static-dynamic combined separator;

[0042] Figure 3 It is a schematic diagram of the static-dynamic combined gap between a traditional rotor and a top cover;

[0043] Figure 4 It is a schematic diagram of a low-resistance and high-efficiency dynamic separator provided by the present invention;

[0044] Figure 5 It is a sectional view of the air suction rotor provided by the present invention;

[0045] Figure 6 It is a structural diagram of the air suction rotor provided by the present invention;

[0046] Figure 7 It is a sectional view of the inner cone provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0048] Due to the traditional static-dynamic combined separator (for the detailed structure, see the attached Figure 1-3.) When the rotor rotates, the rotor blades collide with the pulverized coal particles to separate the coarse and fine powders. This collision separation method has the following problems: the rotor blades are severely worn, the rotor life is short; there is a phenomenon of pulverized coal short-circuit, resulting in poor uniformity of pulverized coal; the separator resistance is large; the separation efficiency is low and the uniformity of pulverized coal is poor.

[0049] In view of this, on the basis of the traditional static and dynamic combined separator, the present utility model has made structural improvements. The air-suction rotor is located between the static blades and the inner cone. This arrangement changes the flow field of the separator, thereby changing the traditional separation mainly by collision method. The present utility model separates mainly by centrifugal method.

[0050] Specifically, the present utility model provides a low-resistance and high-efficiency dynamic separator. Refer to the attached Figure 4 , including: a housing 107, a separation space is formed inside the housing 107, the top of which is a top cover 102. A motor and a speed reducer 104 are connected to the top of the top cover 102. The output end of the motor and the speed reducer 104 is hermetically connected to a transmission shaft 103 extending into the separation space. The top of the top cover 102 has a powder outlet pipe C communicating with the separation space. The bottom of the separation space has a powder inlet pipe 110 and a powder return pipe 111.

[0051] Advantageously, it further includes an air-suction rotor 201. The lower part of the transmission shaft 103 is connected to the air-suction rotor 201. A plurality of static blades 109 are evenly distributed on the circumferential direction of the bottom end of the top cover 102. The bottom end of the static blade 109 is a suspended end and is distributed above the air-suction rotor 201.

[0052] An inner cone 202 is provided corresponding to the lower part of the air-suction rotor 201. A plurality of axial blades 106 are distributed on the circumferential direction of the inner cone 202.

[0053] Among them, the air-suction rotor 201 rotates to generate a centrifugal force, forming an exhaust trend in its surrounding direction and sucking air at its bottom.

[0054] The above solution fundamentally separates the powder inlet and the powder return perfectly, and at the same time solves the problem of pulverized coal short-circuit. Therefore, compared with the traditional static and dynamic combined separator, the above embodiment has the advantages of lower resistance and higher separation efficiency, which is of great significance for improving the pulverized coal quality of the coal pulverizing system and increasing the output of the coal mill.

[0055] Among them, the static blades are the existing ones and are in an inclined state.

[0056] Refer to the attached Figure 5 and 6 , in the embodiment provided by the present utility model, the air-suction rotor 201 includes:

[0057] The central tube 2011, the central tube 2011 is connected to the transmission shaft 103; the upper cone 2012 and the lower cone 2013 are successively connected to the central tube 2011 from top to bottom, and the upper cone 2012 and the lower cone 2013 are connected as a whole to form a structure with a downwardly inclined top and an upwardly inclined bottom;

[0058] The rotor blades 2014, a plurality of rotor blades 2014 are evenly distributed in the circumferential direction and downward at the top of the structure;

[0059] The ring 2015, the bottom of the rotor blade 2014 is connected to the ring 2015;

[0060] Wherein, the ring 2015 is the inlet Z4 of the air suction rotor 201, and the rotor blade 2014, the lower cone 2013 and the ring 2015 form an outlet Z5.

[0061] The number of the above-mentioned outlet Z5 is one less than the number of the rotor blades 2014.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "middle", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0063] See the attached Figure 4 , the inner cone 202 is located directly above the powder inlet pipe 110 and forms an annular channel with the outer shell 107, and a plurality of the axial blades 106 are located in the annular channel, and the axial blades 106 are adjusted in angle through the blade shaft 1061.

[0064] See the attached Figure 7 , the inner cone 202 is successively connected with: a top cone section 2021, a middle cone section 2022, a lower cone section 2023 and a bottom plate 2024 from top to bottom to form a cone structure with a smaller bottom and a larger top, and the middle cone section 2022 is connected to the axial blade 106.

[0065] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0066] In each of the above embodiments, a spiral rising section of the air-powder mixture H is formed from the powder inlet pipe 110 to the axial blades 106 and the middle cone section 2022, and a section where air is inhaled from the bottom and the air-sucking rotor throws out from the side is formed from the top cone section 2021 to the air-sucking rotor 201; a rotating flow field is formed between the outer periphery of the air-sucking rotor 201 and the inner wall of the outer housing 107 to separate large-particle pulverized coal, and the section for returning large-particle pulverized coal is from the outer housing 107 downward to the powder return pipe 111, and the powder outlet section is from the top of the rotating flow field, the stationary blades 109 to the powder outlet pipe C.

[0067] In the above embodiment, the air-powder mixture H enters the separator from the powder inlet pipe 110, is first guided by the axial blades 106 to spiral upward, and then is inhaled from the bottom by the air-sucking rotor and discharged from the side of the air-sucking rotor. A rotating flow field is formed in the annular gap between the air-sucking rotor and the outer housing, and large-particle pulverized coal is centrifugally separated and returns downward along the inner wall of the outer housing to the powder return pipe 111. The remaining air-powder mixture H continues to spiral upward and passes through the stationary blades 109 to enter the pulverized coal outlet pipe C.

[0068] Through the optimization of the separator structure, the present invention changes the original separation method mainly based on collision separation to a separation method mainly based on centrifugal separation, solves the problem of mutual interference between powder inlet and powder return in the original rotor area, realizes the perfect separation of powder inlet and powder return, and at the same time solves the problem of pulverized coal short circuit. Therefore, compared with the traditional static-dynamic combined separator, the present invention has the advantages of lower resistance and higher separation efficiency, which is of great significance for improving the pulverized coal quality of the coal pulverizing system and increasing the output of the coal mill.

[0069] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0070] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A low-resistance and high-efficiency dynamic separator, comprising: Outer housing (107), a separation space is formed inside the outer housing (107), its top is a top cover (102), a motor and a speed reducer (104) are connected to the top of the top cover (102), an output end of the motor and the speed reducer (104) is hermetically connected to a transmission shaft (103) extending into the separation space, the top of the top cover (102) has a powder outlet pipe (C) communicating with the separation space, the bottom of the separation space has a powder inlet pipe (110) and a powder return pipe (111), and it is characterized in that It further includes an air suction rotor (201), the lower part of the transmission shaft (103) is connected with the air suction rotor (201), a plurality of static blades (109) are evenly distributed in the circumferential direction at the bottom end of the top cover (102), the bottom end of the static blade (109) is a suspended end and is distributed above the air suction rotor (201); Inner cone (202), an inner cone (202) corresponds to the lower part of the air suction rotor (201), and a plurality of axial blades (106) are distributed in the circumferential direction of the inner cone (202); Wherein, the air suction rotor (201) rotates to generate centrifugal force, forming an air exhaust trend in its surrounding direction and sucking air at its bottom.

2. The low-resistance and high-efficiency dynamic separator according to claim 1, wherein The air suction rotor (201) includes: Central tube (2011), the central tube (2011) is connected to the transmission shaft (103); an upper cone (2012) and a lower cone (2013) are sequentially connected to the central tube (2011) from top to bottom, and the upper cone (2012) and the lower cone (2013) are connected as a whole to form a structure with a top inclined downward and a bottom inclined upward; Rotor blades (2014), a plurality of rotor blades (2014) are evenly distributed in the circumferential direction at the top of the structure and facing downward; Ring (2015), a ring (2015) is connected to the bottom of the rotor blade (2014); Wherein, the ring (2015) is an inlet (Z4) of the air suction rotor (201), and the rotor blade (2014), the lower cone (2013) and the ring (2015) form an outlet (Z5).

3. The low-resistance and highly efficient dynamic separator according to claim 2, wherein The number of the outlets (Z5) is one less than the number of the rotor blades (2014).

4. The low-resistance and high-efficiency dynamic separator according to claim 2, wherein The inner cone (202) is located directly above the powder inlet pipe (110) and forms an annular channel with the outer housing (107), a plurality of the axial blades (106) are located in the annular channel, and the axial blades (106) are adjusted in angle through a blade shaft (1061).

5. The low-resistance and high-efficiency dynamic separator according to claim 2, characterized in that, The inner cone (202) is sequentially connected with: a top cone section (2021), a middle cone section (2022), a lower cone section (2023) and a bottom plate (2024) from top to bottom to form a cone structure with a smaller bottom and a larger top, and the middle cone section (2022) is connected to the axial blade (106).

6. The low-resistance and high-efficiency dynamic separator according to claim 5, characterized in that, The powder inlet pipe (110) to the axial blades (106) and the middle cone section (2022) form a spiral ascending section of the air-powder mixture (H), and the top cone section (2021) to the air suction rotor (201) form a section where air is sucked from the bottom and thrown out from the side of the air suction rotor; a rotating flow field is formed between the outer periphery of the air suction rotor (201) and the inner wall of the outer casing (107) to separate large-particle pulverized coal. The section from the outer casing (107) downward to the powder return pipe (111) is the return section of the large-particle pulverized coal, and the section from the top of the rotating flow field, the stationary blades (109) to the powder outlet pipe (C) is the powder outlet section.

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