A recirculation fan for a heat treatment furnace

Abstract

The utility model provides a kind of for heat treatment furnace's circulating fan, it is related to heat treatment technical field, to solve the technical problem that circulating fan is not tightly sealed to heat treatment furnace installation.The circulating fan for heat treatment furnace, including substrate and respectively being arranged in the drive arrangement and impeller of the opposite sides of substrate, impeller is arranged on the output shaft of drive arrangement;Circulating fan further includes the plug body around in the output shaft outside, plug body has circular platform shape shell and is arranged in the side of substrate towards impeller, plug body is matched with the mounting hole on the furnace body of heat treatment furnace, wherein, mounting hole is used for the installation of circulating fan;Circulating fan further includes heat-insulating material, heat-insulating material fills in the closed cavity of shell;Along the direction of being away from substrate, the diameter of shell gradually decreases.Circulating fan for heat treatment furnace can improve the sealing property after being installed to mounting hole that circulating fan is installed to heat treatment furnace, so that furnace body outer partial does not over-temperature.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology, and in particular to a circulating fan for a heat treatment furnace. Background Technology

[0002] In aluminum alloy heat treatment furnaces, the heat treatment temperature is generally between 200℃ and 600℃, and high temperature uniformity is required. Usually, a circulating fan is used to stir the furnace gas and blow heat onto the workpiece to achieve better furnace temperature uniformity and heating rate.

[0003] In related technologies, if the circulating fan is not properly sealed when installed in the furnace body of the heat treatment furnace, local overheating of the furnace body can easily occur, causing damage to components such as the motor of the circulating fan, and resulting in a large loss of heat energy. Utility Model Content

[0004] The purpose of this invention is to provide a circulating fan for a heat treatment furnace to solve the technical problem of poor sealing when the circulating fan is installed in the heat treatment furnace.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a circulating fan for a heat treatment furnace, including a base plate and a drive device and an impeller respectively disposed on opposite sides of the base plate, wherein the impeller is disposed on the output shaft of the drive device;

[0007] The circulating fan also includes a plug body surrounding the output shaft. The plug body has a frustum-shaped shell and is disposed on the side of the base plate facing the impeller. The plug body matches a mounting hole on the furnace body of the heat treatment furnace, wherein the mounting hole is used for mounting the circulating fan.

[0008] The circulating fan also includes thermal insulation material, which is filled into the sealed cavity of the housing;

[0009] The diameter of the housing gradually decreases along the direction away from the substrate.

[0010] According to at least one embodiment of the present invention, the difference between the maximum diameter and the minimum diameter of the shell ranges from 40mm to 60mm.

[0011] According to at least one embodiment of the present invention, the shell is made of stainless steel and the thickness of the shell is greater than or equal to 3 mm.

[0012] According to at least one embodiment of the present invention, the base plate is a flange, and a plurality of bolts are provided on the outer wall of the furnace body, the plurality of bolts being evenly arranged around the mounting holes.

[0013] The flange is fixed to the outer wall of the furnace body by the plurality of bolts.

[0014] According to at least one embodiment of the present invention, at least two guide members are further provided on the outer wall of the furnace body, and at least two guide holes for the guide members to pass through are further provided on the flange.

[0015] The at least two guide members and the plurality of bolts are arranged along the same circle, and the height of the guide members is greater than the height of the bolts; and / or,

[0016] The height difference between the guide and the bolt is greater than or equal to 45mm.

[0017] According to at least one embodiment of the present invention, the end of the guide member facing away from the furnace body has a tapered portion;

[0018] Along the direction away from the furnace body, the cross-sectional area of ​​the conical portion gradually decreases.

[0019] According to at least one embodiment of the present invention, the circulating fan further includes a sealing gasket, the sealing gasket comprising at least a first portion disposed between the outer peripheral side of the housing and the wall of the mounting hole.

[0020] According to at least one embodiment of the present invention, the sealing gasket further includes a second portion connected to the first portion, the second portion being disposed between the substrate and the outer wall of the furnace body.

[0021] According to at least one embodiment of the present invention, the thermal insulation material includes refractory fiber cotton.

[0022] According to at least one embodiment of the present invention, the sealing gasket comprises fire-resistant fiber paper.

[0023] In one or more technical solutions provided in the exemplary embodiments of this utility model, at least one of the following beneficial effects can be achieved.

[0024] An exemplary embodiment of this utility model discloses a circulating fan for a heat treatment furnace, comprising a base plate and a drive device and an impeller respectively disposed on opposite sides of the base plate, the impeller being mounted on the output shaft of the drive device. The circulating fan also includes a plug surrounding the output shaft, the plug having a frustum-shaped shell and being disposed on the side of the base plate facing the impeller. When the circulating fan is installed in a mounting hole on the furnace body of the heat treatment furnace, the impeller is located inside the furnace body via the output shaft, while the drive device is located outside the furnace body, and the plug matches the mounting hole. Because the plug has a frustum-shaped shell and its sealed cavity is filled with insulating material, the diameter of the shell gradually decreases along the direction away from the base plate; that is, as the plug is gradually installed into the furnace body, the gap between the plug and the mounting hole of the furnace body gradually decreases, thereby enabling good sealing between the fan and the furnace body. Based on this, the good installation sealing of the circulating fan can improve the uniformity of the heat treatment temperature inside the furnace, preventing local overheating outside the furnace body (at the location of the circulating fan installation). Attached Figure Description

[0025] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0026] Figure 1 This is a cross-sectional structural schematic diagram of a circulating fan according to an embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 A magnified view of part A;

[0028] Figure 3 yes Figure 1 A magnified view of part B;

[0029] Figure 4 This is a top view of the circulating fan according to an embodiment of the present invention.

[0030] Figure label:

[0031] 11. Motor; 12. Impeller; 13. Output shaft; 14. Flange;

[0032] 21. Furnace body; 22. Flange section;

[0033] 31. Sealing gasket; 311. First part; 312. Second part; 32. Insulation layer;

[0034] 41. Shell; 42. Insulation material;

[0035] 50. Guide component; 51. Tapered part; 52. Guide hole;

[0036] 60. Bolts. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] It should be noted that the circulating fan for heat treatment furnaces provided in the exemplary embodiments of this utility model is not only applicable to heat treatment furnaces, but also to other processing equipment that requires control of local overheating.

[0039] Figure 1 This is a cross-sectional structural diagram of a circulating fan according to an embodiment of the present invention. Figure 1 As shown, the circulating fan for a heat treatment furnace provided in an exemplary embodiment of the present invention includes a base plate and a drive device and an impeller 12 respectively disposed on opposite sides of the base plate. The impeller 12 is disposed on the output shaft 13 of the drive device. The circulating fan also includes a plug body surrounding the output shaft 13. The plug body has a frustum-shaped shell 41 and is disposed on the side of the base plate facing the impeller 12. The plug body matches the mounting hole on the furnace body 21 of the heat treatment furnace, wherein the mounting hole is used for mounting the circulating fan. The circulating fan also includes a heat insulation material 42, which fills the sealed cavity of the shell 41. The diameter of the shell 41 gradually decreases along the direction away from the base plate.

[0040] In practical applications, the furnace body 21 of the heat treatment furnace, for example, at the top of the furnace body 21, has mounting holes for installing a circulating fan, so that the impeller 12 of the circulating fan can be installed inside the furnace body 21. The substrate can be installed on the outer wall of the furnace body 21. The driving device can be a motor 11, which is located outside the furnace body 21. The motor 11 drives the impeller 12 to rotate through the output shaft 13, stirring the furnace gas and spraying heat onto the workpiece, thereby improving the temperature uniformity of the workpiece heat treatment. The plug has a shape that is larger at the top and smaller at the bottom, matching the shape of the mounting hole. When the substrate is installed on the furnace body 21, the plug is installed into the mounting hole, and the peripheral side of the plug is adapted to the wall surface of the mounting hole, that is, the diameter of the hole wall gradually decreases from the outside to the inside.

[0041] The plug body is formed by a frustum-shaped sealed shell 41 filled with insulation material 42. One end of the shell 41 is mounted on a base plate, and the other end is welded with a sealing plate. It is understood that the output shaft 13 passes through the plug body and connects to the impeller 12. The portion of the output shaft 13 located within the plug body has a protective shell, and a space is provided in the middle of the plug body for the protective shell to pass through. It is also understood that the axial length of the plug body matches the wall thickness of the furnace body 21. When the furnace body 21 includes the insulation layer 32, the axial length of the plug body is equal to the sum of the thicknesses of the furnace body 21 and the insulation layer 32.

[0042] When the circulating fan is installed, as it is gradually installed into the mounting hole of the furnace body 21 from the outside to the inside, the gap between the frustum-shaped plug and the mounting hole gradually decreases, effectively improving the sealing effect of the circulating fan installation, thereby preventing local areas outside the furnace body, especially the location where the circulating fan is installed, from exceeding the rated temperature.

[0043] For example, the insulation material 42 includes refractory fiber cotton, also known as ceramic fiber cotton or aluminosilicate fiber cotton, which is an inorganic non-metallic high-temperature resistant insulation material. It looks like cotton wool and is made of high-purity alumina, silicon dioxide, etc., which are melted at high temperature and then spun or blown into fibers.

[0044] Figure 2 yes Figure 1 A magnified view of part A. (See diagram below.) Figure 2 As shown, the circulating fan of the exemplary embodiment of the present invention further includes a sealing gasket 31, which includes at least a first portion 311, which is disposed between the outer peripheral side of the housing 41 and the wall of the mounting hole.

[0045] For example, the sealing gasket 31 includes fire-resistant fiber paper, which is an ultra-thin, lightweight, high-temperature resistant ceramic fiber product made of high-purity aluminosilicate fiber through a wet forming process. It looks similar to ordinary paper but can withstand high temperatures of 1000℃ to 1600℃.

[0046] In practical applications, before installing the circulating fan, a 5mm thick layer of refractory fiber paper is wrapped around the periphery of the plug. When the circulating fan is installed, the refractory fiber paper will be compressed and fill the gaps, achieving a good sealing and heat insulation effect. At the same time, the frustum-shaped structure of the plug can also effectively prevent the refractory fiber paper in the gaps from falling off due to equipment vibration during use.

[0047] In some embodiments, the difference between the maximum and minimum diameters of the housing 41 ranges from 40 mm to 60 mm.

[0048] Since the diameter of the housing 41 gradually decreases along the direction away from the substrate, that is, the difference between the diameter of the large end and the diameter of the small end of the housing 41 is 40mm to 60mm, for example, it can be 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm or within any two of the above values.

[0049] Since the heat treatment furnace operates at temperatures ranging from 200°C to 600°C, to ensure the reliability of the housing 41, it is made of rolled stainless steel sheet with a thickness greater than or equal to 3 mm. For example, the sealing plate at the bottom of the housing 41 is also made of stainless steel sheet with a thickness greater than or equal to 3 mm. The housing 41 is welded to the substrate, and the sealing plate is welded to the bottom of the housing 41, thus forming part of the housing.

[0050] Figure 3 yes Figure 1 A magnified view of part B; Figure 4 This is a top view schematic diagram of the circulating fan according to an embodiment of the present utility model. (In conjunction with...) Figure 3 and Figure 4 As shown, the base plate can be a flange 14, and multiple bolts 60 are provided on the outer wall of the furnace body 21. The multiple bolts 60 are evenly arranged around the mounting holes; the flange 14 is fixed to the outer wall of the furnace body 21 by the multiple bolts 60.

[0051] In practical applications, a flange 22 is provided on the outer wall of the furnace body 21. For example, bolts 60 are welded in multiple holes of the flange 22, and the flange 22 is welded to the outer wall of the furnace body 21. The flange 14 of the circulating fan has bolt holes that correspond one-to-one with the bolts 60, so that the flange 14 can be detachably connected to the flange 22 by multiple bolts 60 and corresponding nuts.

[0052] For example, the flange 14 has a thickness of 16mm, which ensures that the flange 14 has sufficient strength and rigidity, so that it is not easily deformed when the fan is installed, thereby ensuring the sealing performance.

[0053] In some implementations, such as Figure 2 and Figure 3 As shown, the sealing gasket 31 also includes a second part 312 connected to the first part 311, and the second part 312 is disposed between the substrate and the outer wall of the furnace body 21.

[0054] In practical applications, a sealing gasket 31 is installed between the flange 14 and the flange 22 of the furnace body 21, that is, a 5mm thick refractory fiber paper is placed between the flange 14 and the flange 22 of the furnace body 21, which can further achieve a good seal between the blower and the furnace body 21.

[0055] Due to the large weight of the circulating fan, a crane is required for installation. To facilitate quick installation and precise positioning of the circulating fan, such as... Figure 2As shown, in the circulating fan provided in the exemplary embodiment of this utility model, at least two guide members 50 are also provided on the outer wall of the furnace body 21, and at least two guide holes 52 for the guide members 50 to pass through are also provided on the flange 14; at least two guide members 50 and multiple bolts 60 are arranged along the same circle, and the height of the guide member 50 is greater than the height of the bolt 60.

[0056] In practical applications, two guide members 50 are welded onto the flange 22 of the furnace body 21, with the two guide members 50 located at opposite positions on the flange 22. The flange 14 has two guide holes 52 through which guide holes 52 pass. It can be understood that the two guide members 50 and multiple bolts 60 are arranged along the same circle, and the centers of the guide holes 52 and the bolt holes of the flange 14 are all located on the same circle.

[0057] The height of the guide 50 is greater than the height of the bolt 60. For example, when the height difference between the guide 50 and the bolt 60 is greater than or equal to 45mm, it can effectively ensure that the fan will not collide with the bolt 60 under the guidance of the guide 50 when the fan is installed from top to bottom, thus ensuring the reliability of the bolt 60.

[0058] It should be noted that the number of guide components 50 can also be 3, 4, etc., and they can be evenly arranged along the circumference of the flange 22.

[0059] Continue as Figure 2 As shown, the end of the guide member 50 away from the furnace body 21 has a tapered portion 51; along the direction away from the furnace body 21, the cross-sectional area of ​​the tapered portion 51 gradually decreases.

[0060] In practical applications, the guide member 50 is a circular pin-shaped component, with its tapered portion 51 at the top serving as the pin tip. The radius of the larger end of the tapered portion 51 is 10mm larger than the radius of the smaller end. Based on this, the guide member 50 with the tapered portion 51 can ensure good guiding performance, thereby facilitating the installation of the circulating fan.

[0061] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A circulating fan for a heat treatment furnace, characterized in that, It includes a substrate and a drive device and an impeller respectively disposed on opposite sides of the substrate, wherein the impeller is disposed on the output shaft of the drive device; The circulating fan also includes a plug body surrounding the output shaft. The plug body has a frustum-shaped shell and is disposed on the side of the base plate facing the impeller. The plug body matches a mounting hole on the furnace body of the heat treatment furnace, wherein the mounting hole is used for mounting the circulating fan. The circulating fan also includes thermal insulation material, which is filled into the sealed cavity of the housing; The diameter of the housing gradually decreases along the direction away from the substrate.

2. The circulating fan according to claim 1, characterized in that, The difference between the maximum and minimum diameter of the shell ranges from 40mm to 60mm.

3. The circulating fan according to claim 1, characterized in that, The shell is made of stainless steel and has a thickness greater than or equal to 3 mm.

4. The circulating fan according to claim 1, characterized in that, The base plate is a flange, and multiple bolts are provided on the outer wall of the furnace body. The multiple bolts are evenly arranged around the mounting holes. The flange is fixed to the outer wall of the furnace body by the plurality of bolts.

5. The circulating fan according to claim 4, characterized in that, The outer wall of the furnace body is also provided with at least two guide members, and the flange is also provided with at least two guide holes for the guide members to pass through; The at least two guide members and the plurality of bolts are arranged along the same circle, and the height of the guide members is greater than the height of the bolts; and / or, The height difference between the guide and the bolt is greater than or equal to 45mm.

6. The circulating fan according to claim 5, characterized in that, The end of the guide member facing away from the furnace body has a tapered portion; Along the direction away from the furnace body, the cross-sectional area of ​​the conical portion gradually decreases.

7. The circulating fan according to any one of claims 1-6, characterized in that, The circulating fan also includes a sealing gasket, which includes at least a first portion disposed between the outer peripheral side of the housing and the wall of the mounting hole.

8. The circulating fan according to claim 7, characterized in that, The sealing gasket also includes a second portion connected to the first portion, the second portion being disposed between the substrate and the outer wall of the furnace body.

9. The circulating fan according to claim 7, characterized in that, The insulation material includes refractory fiber cotton.

10. The circulating fan according to claim 7, characterized in that, The sealing gasket comprises fire-resistant fiber paper.

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