Vertical mill circulating fan

Abstract

The utility model provides a vertical mill circulating fan, and relates to the technical field of vertical mills, the vertical mill circulating fan comprises a drying box, a first air pipe and a second air pipe, one side of the drying box is provided with an air heater, the air outlet end of the air heater is communicated with the interior of the drying box, the top of the drying box is provided with an air collecting cover communicated with the drying box, and the air collecting cover is connected with a first fan through the first air pipe; the first fan is connected with a heat recovery device through a second air pipe, the heat recovery device is communicated with the air inlet end of the hot-air blower, and a filter assembly is arranged in the air collecting cover. Hot air after drying returns to the hot-air blower again through the air collecting cover, the first air collecting pipe, the second air collecting pipe and the heat recovery device. When the hot air passes through the filtering assembly in the air collecting cover, dust in the hot air is filtered, the dust in the hot air is effectively prevented from entering the heat recovery device to affect the heat exchange efficiency or cause blockage, circulation of the hot air is guaranteed, and the circulating drying effect of the drying box is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of vertical mills, and in particular to a vertical mill circulation fan. Background Art

[0002] The vertical mill circulation fan is an important component of the vertical mill system. It is mainly responsible for providing circulating airflow to achieve functions such as material drying, conveying and sorting. In the vertical mill system, a hot air blower is generally used to heat the drying box.

[0003] A Chinese patent with publication number CN215524116U discloses a vertical mill circulating fan, which is designed to allow the hot air after drying in the drying box to pass through the first air collecting duct, the second air collecting duct, and the heat recovery device and return to the hot air blower again, thereby avoiding heat waste and increasing the heating time and heating efficiency of the hot air, further increasing the drying efficiency of the drying box; the heat recovery device can exchange heat with the hot air after drying in the drying box to increase the utilization rate of heat.

[0004] When the above device is used for the drying box, the first fan draws the hot air in the drying box into the hot air fan through the first air collecting duct, the second air collecting duct, and the coil of the heat recovery device. When the hot air flows in the coil, heat is exchanged with the heat exchange tube. However, since the hot air after drying carries a large amount of dust, the dust is easily adsorbed on the inner wall of the coil after entering the coil, affecting the heat exchange efficiency between the coil and the heat exchange tube, and the coil is easily blocked over time, resulting in the hot air not circulating, affecting the circulation drying effect of the drying box. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a vertical mill circulating fan, which can solve the technical problems in the prior art of using hot air to dry the drying box, that dust enters the coil, which can easily affect the heat exchange efficiency between the coil and the heat exchange tube, easily cause the coil to be blocked, resulting in hot air not circulating, and affecting the circulating drying effect of the drying box.

[0006] The embodiment of the present application provides a vertical mill circulation fan, comprising a drying box, a first air duct and a second air duct, a hot air blower is arranged on one side of the drying box, an air outlet end of the hot air blower is communicated with the interior of the drying box, an air collecting hood communicated with the drying box is arranged on the top of the drying box, the air collecting hood is connected to a first fan through the first air duct, the first fan is connected to a heat recovery device through the second air duct, the heat recovery device is communicated with the air inlet end of the hot air blower, and a filter assembly is arranged in the air collecting hood;

[0007] The filter assembly includes a filter frame, a first filter screen, a second filter screen and a filter cloth. The first filter screen and the second filter screen are fixed on the filter frame from bottom to top, and the filter cloth is located between the first filter screen and the second filter screen.

[0008] Furthermore, an opening is provided on one side of the air collecting hood, and the filter frame is drawn into the air collecting hood through the opening.

[0009] Furthermore, a handle is provided on the filter frame, and the handle is located on the outside of the air collecting hood.

[0010] Furthermore, a sealing ring is provided at the connection between the filter frame and the air collecting hood.

[0011] Furthermore, a support block is fixedly provided on the inner wall of the air collecting hood, and the support block abuts against the bottom of the filter frame.

[0012] Furthermore, the filter frame is provided with a through hole, the air collecting cover is provided with a threaded hole, a bolt is provided in the through hole, and the bolt passes through the through hole and is threadedly connected to the threaded hole.

[0013] Furthermore, the heat recovery device includes a shell, a connecting pipe, a plurality of heat exchange tube bundles, a plurality of first baffles and a plurality of second baffles. The plurality of first baffles and the plurality of second baffles are fixed in the shell in an up-and-down manner, and an air guide bend is formed in the shell. The heat exchange tube bundle is located in the air guide bend. A heat exchange tube bundle is provided between adjacent first baffles and second baffles. Both ends of the heat exchange tube bundle extend to the outside of the shell, and the plurality of heat exchange tube bundles are connected through the connecting pipe.

[0014] Furthermore, the air outlet end of the hot air blower is connected to an air dispersion hood, and the air dispersion hood is evenly distributed with air dispersion holes.

[0015] Furthermore, a second fan is provided on the top of the shell, and an air outlet of the second fan is connected to the shell.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a filter assembly in the air collecting hood, and the hot air after drying returns to the hot air blower again through the air collecting hood, the first air collecting duct, the second air collecting duct and the heat recovery device, wherein the dust in the hot air is filtered when the hot air passes through the filter assembly in the air collecting hood, effectively preventing the dust in the hot air from entering the heat recovery device to affect the heat exchange efficiency or cause blockage, thereby ensuring the circulation of the hot air and the circulating drying effect of the drying box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of some embodiments of the present application;

[0020] Figure 2 It is a cross-sectional view of some embodiments of the present application;

[0021] Figure 3 It is a schematic diagram of the structure of the air collecting hood in some embodiments of the present application;

[0022] Figure 4 This is a schematic diagram of the connection structure of the connecting pipe and the heat exchange tube bundle in some embodiments of the present application;

[0023] The reference numerals are:

[0024] 1. Drying box; 2. First air duct; 3. First fan; 4. Second air duct; 5. Hot air blower; 6. Air hood; 61. Opening; 62. Threaded hole; 7. Heat recovery device; 71. Shell; 72. Connecting pipe; 73. Heat exchange tube bundle; 74. First baffle; 75. Second baffle; 8. Filter assembly; 81. Filter frame; 811. Through hole; 82. First filter screen; 83. Second filter screen; 84. Filter cloth; 9. Handle; 10. Sealing ring; 11. Support block; 12. Bolt; 13. Air hood; 14. Second fan. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. Specific embodiment:

[0032] like Figure 1-3As shown, the present application provides a vertical mill circulation fan, including a drying box 1, a first air duct 2 and a second air duct 4, a hot air blower 5 is provided on one side of the drying box 1, an air outlet end of the hot air blower 5 is communicated with the interior of the drying box 1, a wind collecting hood 6 communicated with the interior of the drying box 1 is provided on the top of the drying box 1, the wind collecting hood 6 is connected to the first air blower 3 through the first air duct 2, the first air blower 3 is connected to the heat recovery device 7 through the second air duct 4, the heat recovery device 7 is communicated with the air inlet end of the hot air blower 5, a filter component 8 is provided in the wind collecting hood 6, the hot air blower 5 inputs hot air into the drying box 1, and uses the hot air to dry the drying box 1, the first air blower 3 sucks out the hot air dried in the drying box 1, and makes the hot air return to the hot air blower 5 again through the wind collecting hood 6, the first air collecting duct, the second air collecting duct and the heat recovery device 7, wherein the hot air passes through the filter component in the wind collecting hood 6 8, the dust in the hot air is filtered, which effectively prevents the dust in the hot air from entering the heat recovery device 7 to affect the heat exchange efficiency or cause blockage, thereby ensuring the circulation of hot air and the circulating drying effect of the drying box 1. Specifically, the filter assembly 8 includes a filter frame 81, a first filter screen 82, a second filter screen 83 and a filter cloth 84. The first filter screen 82 and the second filter screen 83 are fixed on the filter frame 81 from bottom to top, and the filter cloth 84 is located between the first filter screen 82 and the second filter screen 83. The hot air after drying passes through the first filter screen 82, the filter cloth 84 and the second filter screen 83 from bottom to top in sequence, wherein the first filter screen 82 and the second filter screen 83 play a positioning role for the filter cloth 84, and the dust in the hot air is filtered by the first filter screen 82, the filter cloth 84 and the second filter screen 83 to prevent the dust in the hot air from entering the heat recovery device 7.

[0033] like Figure 1 and Figure 3 As shown, an opening 61 is provided on one side of the air collecting hood 6, and a filter frame 81 is pull-out and arranged in the air collecting hood 6 through the opening 61. When dust adhering to the filter assembly 8 affects the circulation of hot air, the filter assembly 8 can be easily pulled out for replacement.

[0034] like Figure 1 and Figure 3 As shown, a handle 9 is provided on the filter frame 81 , and the handle 9 is located outside the air collecting cover 6 , so that the filter frame 81 can be easily pulled out through the handle 9 .

[0035] like Figure 3 As shown, a sealing ring 10 is provided at the connection between the filter frame 81 and the air collecting hood 6. The sealing ring 10 prevents hot air from leaking out from the connection between the filter frame 81 and the air collecting hood 6 to cause loss, and prevents dust in the hot air from leaking out and polluting the environment.

[0036] like Figure 2 and Figure 3As shown, a support block 11 is fixedly disposed on the inner wall of the air collecting hood 6 , and the support block 11 abuts against the bottom of the filter frame 81 , and the filter frame 81 is supported by the support block 11 to stabilize the filter frame 81 .

[0037] like Figure 3 As shown, a through hole 811 is provided on the filter frame 81, a threaded hole 62 is provided on the air collecting hood 6, a bolt 12 is provided in the through hole 811, the bolt 12 passes through the through hole 811 and is threadedly connected with the threaded hole 62, the filter frame 81 is installed on the air collecting hood 6 by the bolt 12, when the filter assembly 8 needs to be replaced, first screw the bolt 12 to remove the bolt 12, and then pull out the filter frame 81 to replace the new filter assembly 8.

[0038] like Figure 2 and Figure 4 As shown, the heat recovery device 7 includes a shell 71, a connecting pipe 72, a plurality of heat exchange tube bundles 73, a plurality of first baffles 74 and a plurality of second baffles 75. The plurality of first baffles 74 and the plurality of second baffles 75 are fixedly arranged in the shell 7 with vertical displacement, and an air guide bend is formed in the shell 71. The heat exchange tube bundle 73 is located in the air guide bend. A heat exchange tube bundle 73 is provided between each of the adjacent first baffles 74 and the second baffles 75. Both ends of the heat exchange tube bundle 73 extend to the outside of the shell 71. The plurality of heat exchange tube bundles 73 are connected through the connecting pipe 72. The hot air enters the shell 71, flows along the air guide bend, and finally returns to the hot air blower 5. At the same time, cold water is input into one end of the connecting pipe 72, and the cold water flows through the heat exchange tube bundle 73 to exchange heat with the hot air in the shell 71, thereby heating the cold water for use. In this embodiment, the outer surfaces of the first air duct 2, the second air duct 4 and the connecting pipe 72 are all wrapped with thermal insulation cotton to reduce heat loss.

[0039] like Figure 2 As shown, the air outlet of the hot air blower 5 is connected to an air dispersion cover 13, and air dispersion holes are evenly distributed on the air dispersion cover 13. The hot air evenly enters the drying box 1 through the air dispersion cover 13, and the drying effect is better.

[0040] like Figure 1 and Figure 2 As shown, a second fan 14 is provided on the top of the shell 71, and an air outlet of the second fan 14 is connected to the shell 71. The air is absorbed by the second fan 14 and input into the shell 71, thereby replenishing the hot air lost in the pipeline.

[0041] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vertical mill circulation fan, characterized in that: The invention comprises a drying box, a first air duct and a second air duct, a hot air blower is arranged on one side of the drying box, an air outlet end of the hot air blower is communicated with the interior of the drying box, an air collecting hood communicated with the interior of the drying box is arranged on the top of the drying box, the air collecting hood is connected with a first fan through the first air duct, the first fan is connected with a heat recovery device through the second air duct, the heat recovery device is communicated with the air inlet end of the hot air blower, and a filter assembly is arranged in the air collecting hood; The filter assembly includes a filter frame, a first filter screen, a second filter screen and a filter cloth. The first filter screen and the second filter screen are fixed on the filter frame from bottom to top, and the filter cloth is located between the first filter screen and the second filter screen.

2. A vertical mill circulation fan according to claim 1, characterized in that: An opening is arranged on one side of the air collecting hood, and the filter frame is arranged in the air collecting hood in a drawable manner through the opening.

3. A vertical mill circulation fan according to claim 2, characterized in that: The filter frame is provided with a handle, and the handle is located on the outside of the air collecting cover.

4. A vertical mill circulation fan according to claim 2, characterized in that: A sealing ring is provided at the connection between the filter frame and the air collecting cover.

5. The vertical mill circulation fan according to claim 1, characterized in that: A support block is fixedly arranged on the inner wall of the air collecting hood, and the support block abuts against the bottom of the filter frame.

6. A vertical mill circulation fan according to claim 1, characterized in that: The filter frame is provided with a through hole, the air collecting cover is provided with a threaded hole, a bolt is arranged in the through hole, and the bolt passes through the through hole and is threadedly connected with the threaded hole.

7. The vertical mill circulation fan according to claim 1, characterized in that: The heat recovery device includes a shell, a connecting pipe, a plurality of heat exchange tube bundles, a plurality of first baffles and a plurality of second baffles. The plurality of first baffles and the plurality of second baffles are fixed in the shell in an up-and-down manner, and an air guide bend is formed in the shell. The heat exchange tube bundle is located in the air guide bend. A heat exchange tube bundle is provided between adjacent first baffles and second baffles. Both ends of the heat exchange tube bundle extend to the outside of the shell, and the plurality of heat exchange tube bundles are connected through the connecting pipe.

8. The vertical mill circulation fan according to claim 1, characterized in that: The air outlet end of the hot air blower is connected with an air dispersion cover, and the air dispersion cover is evenly distributed with air dispersion holes.

9. The vertical mill circulation fan according to claim 7, characterized in that: A second fan is disposed on the top of the shell, and an air outlet end of the second fan is communicated with the shell.

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