阅读说明：本技术 一种耐高温型关风机 (High temperature resistant type closes fan ) 是由 宋瑞宏 涂李冬 史文杰 戴忞中 陈晨 于 2020-04-15 设计创作，主要内容包括：本发明公开一种耐高温型关风机,包括：机壳,机壳的内圈壁沿其轴向间隔设有多个垂直于轴向的导向凹槽,机壳的两侧分别开设有与机壳内部连通的进口和出口；转轴,转轴沿轴向转动穿装在机壳内,围绕转轴间隔设有多个沿转轴轴向的叶片,叶片朝向机壳内壁的一侧设有与导向凹槽导向配合的凸齿,叶片与机壳内壁之间形成密封副；叶片表面包覆有Ni60-WC激光熔覆涂层,Ni60-WC激光熔覆涂层中Ni60:WC＝9:1(质量比)。本发明关风机可大大提高关风机的密封性,且在高温下会取得更好的密闭效果；对关风机叶片表面通过激光熔覆形成Ni60-WC激光熔覆涂层,较好增加了叶片的耐磨损性能和耐热性能。(The invention discloses a high-temperature resistant type air shutter, which comprises: the inner ring wall of the shell is provided with a plurality of guide grooves perpendicular to the axial direction at intervals along the axial direction, and the two sides of the shell are respectively provided with an inlet and an outlet communicated with the interior of the shell; the rotating shaft is rotatably arranged in the shell in an penetrating mode along the axial direction, a plurality of blades in the axial direction of the rotating shaft are arranged around the rotating shaft at intervals, one side, facing the inner wall of the shell, of each blade is provided with a convex tooth in guiding fit with the corresponding guide groove, and a sealing pair is formed between each blade and the inner wall of the shell; the surface of the blade is coated with a Ni60-WC laser cladding coating, and Ni60: WC in the Ni60-WC laser cladding coating is 9:1 (mass ratio). The air-closing machine can greatly improve the sealing performance of the air-closing machine, and can obtain better sealing effect at high temperature; the Ni60-WC laser cladding coating is formed on the surface of the blade of the air shutter through laser cladding, so that the wear resistance and the heat resistance of the blade are better improved.)

1. The utility model provides a fan is closed to high temperature resistant type which characterized in that: the method comprises the following steps:

the inner ring wall of the shell (1) is provided with a plurality of guide grooves (2) perpendicular to the axial direction at intervals along the axial direction, and two sides of the shell (1) are respectively provided with an inlet (3) and an outlet (4) communicated with the interior of the shell (1);

the rotating shaft (5) is rotatably arranged in the shell (1) in a penetrating mode along the axial direction, a plurality of blades (6) along the axial direction of the rotating shaft (5) are arranged around the rotating shaft (5) at intervals, and one side, facing the inner wall of the shell (1), of each blade (6) is provided with a convex tooth (7) matched with the guide groove (2) in a guiding mode; the surface of the blade (6) is coated with a Ni60-WC laser cladding coating, and Ni60: WC (9 +/-0.5: 1) (mass ratio) in the Ni60-WC laser cladding coating.

2. The high temperature resistant type air shutter according to claim 1, characterized in that: the Ni60-WC laser cladding coating is obtained by the following method:

step 1, preparing laser cladding powder

Mixing Ni60 and WC in a mass ratio of 9:1, and ball-milling the mixed powder in a ball mill for at least 2 hours to obtain composite powder;

step 2, powder preparation

Taking out and drying the ball-milled composite powder in the step 1, fully mixing the mixed powder by using a polyvinyl alcohol organic adhesive with the mass concentration of 3% to form a paste, uniformly coating the paste on a blade (6) subjected to surface pretreatment, flattening the surface and drying the preset layer with the thickness of 0.9-1mm for later use;

step 3, preparing the Ni60+ WC composite coating by laser cladding

Putting the dried blade (6) on a platform of a laser, setting the technological parameters of the laser to be 1.6KW, the scanning speed to be 420mm/min, the defocusing amount: 55mm, protective gas flow: 8 L.h < -1 >, and finally preparing a Ni60-WC laser cladding coating on the surface of the blade (6).

3. The high temperature resistant type air shutter according to claim 1, characterized in that: the mounting hole has been seted up respectively at the both ends of casing (1), and the outer fringe of mounting hole is equipped with annular boss around circumference, and mounting hole department is equipped with the bearing frame, the bearing frame passes through annular boss installation, the both ends of pivot (5) are passed through the bearing and are rotated and install on the bearing frame, and pivot (5) are coaxial with the casing.

4. The high temperature resistant type air shutter according to claim 3, characterized in that: the outer wall of the rotating shaft (5) is provided with a plurality of dovetail grooves along the axial direction at intervals along the circumferential direction, and the blades (6) can enter the inside of the casing through mounting ports at two ends of the casing and are clamped on the rotating shaft (5) through the dovetail grooves.

Technical Field

The invention belongs to the technical field of light fans, and particularly relates to a high-temperature-resistant type air shutter fan.

Background

The air-shutting machine is classified into three types, namely a common type, a pressure-resistant type and a high-temperature-resistant type, is important equipment in a pneumatic conveying and ventilating dust removal network, and has the main function of continuously and timely discharging materials in a discharger or a dust remover and simultaneously ensuring that the pressure in the equipment is not exposed to a normal-pressure environment. The air seal machinery is widely applied to pneumatic transportation of equipment in the industries of rice milling, powder making, feed, machinery, chemical engineering, medicine, tobacco, metallurgy, cement, dust removal and the like and unloading in a pipe network pressure state. When the air-blocking machine is used in a high-temperature state, for example, in the production of the expanded precipitated material, the temperature of the expanded material after being demoulded can reach 150 ℃, the moisture content reaches 30%, the material characteristics show high temperature and high humidity, and the characteristics are completely different from those of conventional powder. For example, the temperature of some materials is as high as 600 ℃ when the materials are just manufactured, and under the production condition, the problems of material blockage or serious air leakage, large air leakage and the like caused by blade deformation can occur in the actual use of the conventional air-shutting machine. The air shutter blades and the air shutter shell are generally made of carbon structural steel materials, deformation, corner collapse and abrasion are inevitable in high-temperature occasions, oxides are generated on the surface of the carbon structural steel to cause pitting corrosion, and the failure modes can cause the surface rate of the steel to fail first or even break suddenly and the like. Therefore, the necessary surface strengthening measures for the carbon steel can improve the high temperature resistance and the wear resistance of the steel surface, can also greatly reduce the production cost of enterprises and obtain good economic benefit.

Disclosure of Invention

In order to overcome the technical defects in the prior art, the invention provides the high-temperature-resistant type air shutter which can not influence the sealing property or cause the blocking phenomenon due to the high-temperature expansion and even deformation of the blades at higher temperature.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a high temperature resistant type air shutter, comprising:

the inner ring wall of the shell is provided with a plurality of guide grooves perpendicular to the axial direction at intervals along the axial direction, and the two sides of the shell are respectively provided with an inlet and an outlet communicated with the interior of the shell;

the rotating shaft is rotatably arranged in the shell in an axial direction in a penetrating mode, a plurality of blades in the axial direction of the rotating shaft are arranged around the rotating shaft at intervals, and one side, facing the inner wall of the shell, of each blade is provided with a convex tooth in guiding fit with the corresponding guide groove; the surface of the blade is coated with a Ni60-WC laser cladding coating, and Ni60: WC (9 +/-0.5: 1) in the Ni60-WC laser cladding coating is in a mass ratio.

Further, the Ni60-WC laser cladding coating is obtained by the following method:

step 1, preparing laser cladding powder

Mixing Ni60 and WC in a mass ratio of 9:1, and ball-milling the mixed powder in a ball mill for at least 2 hours to obtain composite powder;

step 2, powder preparation

Taking out and drying the ball-milled composite powder in the step 1, fully mixing the mixed powder by using a polyvinyl alcohol organic adhesive with the mass concentration of 3% to form a paste, uniformly coating the paste on the surface-pretreated blade, flattening the surface of the blade with the thickness of a preset layer of 0.9-1mm, and drying the blade for later use;

step 3, preparing the Ni60+ WC composite coating by laser cladding

The dried blade is placed on a platform of a laser, the technological parameters of the laser are set to be 1.6KW, the scanning speed is 420mm/min, and the defocusing amount is as follows: 55mm, protective gas flow: 8 L.h < -1 >, and finally preparing a Ni60-WC laser cladding coating on the surface of the blade.

The installing port has been seted up respectively at the both ends of casing, and the outer fringe of installing port is equipped with annular boss around circumference, and installing port department is equipped with the bearing frame, the bearing frame passes through annular boss installation, the both ends of pivot are passed through the bearing and are rotated and install on the bearing frame, and the pivot is coaxial with the casing.

Furthermore, in order to facilitate the replacement of the blades in the disassembly and assembly process, a plurality of dovetail grooves are formed in the outer wall of the rotating shaft at intervals along the circumferential direction, the blades can enter the interior of the casing through mounting ports at two ends of the casing and are clamped on the rotating shaft through the dovetail grooves.

Compared with the prior art, the invention has the following technical effects: the edge of the air-lock valve blade is provided with the convex teeth, and the inner wall of the air-lock valve shell is provided with the guide groove matched with the convex teeth of the blade, so that the air-lock valve blade can be fixed at a certain position to rotate by the guide groove when rotating, the sealing performance of the air-lock valve can be greatly improved by the design, and a better sealing effect can be obtained at high temperature; the Ni60-WC laser cladding coating is formed on the surface of the blade of the air shutter through laser cladding, so that the wear resistance and the heat resistance of the blade are better improved.

Drawings

Fig. 1 is a schematic structural diagram of a ventilation closing machine in the embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a casing of a ventilation device in an embodiment of the invention.

Fig. 3 is a top view of fig. 2.

FIG. 4 is an illustration of the assembly of the shutter blades and shaft in an embodiment of the present invention.

Fig. 5 is a right side view of fig. 4.

FIG. 6 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 9:1 formed on the surface of a vane in an embodiment of the present invention after high temperature frictional wear;

fig. 7 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 4:1 formed on the surface of a blade after high temperature frictional wear in an embodiment of the present invention.

Fig. 8 is a wear curve of a Ni60-WC laser cladding coating of Ni60: WC 7:3 formed on the surface of a blade after high temperature frictional wear in an embodiment of the present invention.

Fig. 9 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 9:1 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.

Fig. 10 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 4:1 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.

Fig. 11 is an electron micrograph of Ni60-WC laser cladding coating of Ni60: WC 7:3 formed on the surface of a vane before and after high temperature frictional wear at 50 × magnification in an example of the present invention, where a is before wear and b is after wear.

The reference numbers in the figures are: 1. the device comprises a shell, 2 parts of guide grooves, 3 parts of inlets, 4 parts of outlets, 5 parts of rotating shafts, 6 parts of blades and 7 parts of convex teeth.

Detailed Description

The invention is described in more detail below with reference to the following examples:

a high temperature resistant type air shutter of the present embodiment, as shown in fig. 1 to 4, comprises a casing 1 and a rotating shaft 5,

the inner ring wall of the machine shell 1 is provided with a plurality of guide grooves 2 perpendicular to the axial direction at intervals along the axial direction, and the two sides of the machine shell 1 are respectively provided with an inlet 3 and an outlet 4 communicated with the inside of the machine shell 1. The rotating shaft 5 is rotatably arranged in the machine shell 1 along the axial direction, a plurality of blades 6 along the axial direction of the rotating shaft 5 are arranged around the rotating shaft 5 at intervals, and one side of each blade 6, which faces the inner wall of the machine shell 1, is provided with a convex tooth 7 in guiding fit with the guide groove 2; the surface of the blade 6 is coated with a Ni60-WC laser cladding coating, wherein the mass ratio of Ni60 to WC is 9:1, Ni60 to WC is 4:1, and Ni60 to WC is 7:3 in the Ni60-WC laser cladding coating.

Specifically, the installing port has been seted up respectively at the both ends of casing 1, and the outer fringe of installing port is equipped with annular boss around circumference, and installing port department is equipped with the bearing frame, and the bearing frame passes through annular boss installation, and the bearing rotation is installed on the bearing frame at the both ends of pivot 5, and pivot 5 is coaxial with the casing.

The outer wall of pivot 5 is equipped with a plurality of dovetail along axial direction around circumference interval, and blade 6 can get into the casing through the installing port at casing both ends inside and clamp on pivot 5 through the dovetail (also, for the convenience of blade installation, the blade is kept away from the distance between one side of installation axle and the pivot center pin and is less than or equal to the radius of installing port), and the material of 6 base members of blade and casing 1 is the Q235 steel.

The examples of forming the Ni60-WC laser cladding coating on the surface of the blade 6 are as follows: