An integrally recyclable, highly energy-efficient and anti-corrosion fan

Abstract

The present invention provides an integrally recyclable, highly energy-efficient and anti-corrosion fan, comprising: a frame, on which a volute is installed, an impeller is installed inside the volute, a motor is installed on the rear side of the volute and is connected to the impeller, and both the volute and the impeller are integrally injection-molded by using a corrosion-resistant, high-hardness and recyclable linear low-density polyethylene material mold. This integrally recyclable, highly energy-efficient and anti-corrosion fan has a simple structure, ingenious design, small volume, light weight, low mass production, maintenance, transportation and installation costs, good anti-corrosion effect, the volute and the impeller are made of corrosion-resistant, high-hardness and recyclable linear low-density polyethylene, and it is integrally recyclable, meeting the environmental protection requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of fan equipment, and particularly relates to an integrally recyclable, highly energy-efficient and anti-corrosion fan. Background Art

[0002] A fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. Fans are mainly used for ventilation and air exchange in various fields of the national economy such as metallurgy, petrochemical, electric power, urban rail transit, textile, shipbuilding, etc. and various places. In addition to the traditional application fields, there will still be great development prospects in more than 20 potential market fields such as the comprehensive utilization of coal gangue, the technological transformation of new dry-process clinker, the energy conservation and comprehensive utilization of the metallurgical industry. From the perspective of the demand structure of the main fields, general ventilation and air exchange fans (generally medium and small centrifugal and axial flow fans) are the most widely used, with the largest demand and the most manufacturers. Generally speaking, the supply of such products exceeds the demand. However, the demand for special-purpose fans (including anti-corrosion fans, high-temperature fans, wear-resistant fans, fire smoke exhaust fans, etc.) is not very large, but due to the special working environment, they need to be treated differently because the main material requirements are relatively special.

[0003] In order to achieve the purpose of anti-corrosion, the existing anti-corrosion fans generally adopt a metal structure with an anti-corrosion coating on the surface. The anti-corrosion fans with a metal structure are large in volume, heavy in weight, and high in production, maintenance, transportation and installation costs. Once the internal structure of the anti-corrosion fan is damaged, it is very difficult to perform local repair, and the entire fan needs to be scrapped. There are also those made of fiberglass. Although fiberglass has good anti-corrosion effects, it is heavy in weight, non-degradable and non-recyclable, so improvement is needed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention proposes an integrally recyclable, highly energy-efficient and anti-corrosion fan, which is made of corrosion-resistant, high-hardness and recyclable linear low-density polyethylene, with a simple structure, small volume, light weight, low production, maintenance, transportation and installation costs, and good anti-corrosion effect.

[0005] To achieve the above technical solution, the present invention provides an integrally recyclable, highly energy-efficient and anti-corrosion fan, including: a frame, on which a volute is installed, an impeller is installed in the volute, a motor is installed on the rear side of the volute and connected to the impeller, and both the volute and the impeller are integrally injection-molded with a corrosion-resistant, high-hardness and recyclable linear low-density polyethylene material, and the corrosion-resistant, high-hardness and recyclable linear low-density polyethylene material is made by the following method:

[0006] S1. Purge the reactor with nitrogen at 110 - 120 °C for 1 - 2 hours to remove air, moisture, and impurities inside the reactor. Then, at room temperature, add hexane solvent to the reactor and stir for 5 - 10 minutes. Next, inject the catalyst slurry into the reactor and stir for 5 - 15 minutes to mix the catalyst slurry well with the hexane solvent. Then, inject 1 - butene comonomer and the required hydrogen for the reaction into the reactor, and continuously introduce ethylene gas at 0.5 Mpa into the reactor. Heat the reactor to 80 - 90 °C until polymerization for 1 h. After the polymerization ends, stop the ethylene flow to the reactor, quickly exhaust to reduce the reactor pressure, and remove the unreacted substances. Wait for the temperature inside the reactor to drop to room temperature, then take out the obtained polymer, precipitate it in an ethanol solution, filter, and conduct vacuum drying to obtain the matrix of linear low - density polyethylene material;

[0007] S2. Add solid microfibrillated cellulose and deionized water to a blender at a mass ratio of 1:50, and stir evenly to prepare a 2% microfibrillated cellulose suspension. Add the 2% microfibrillated cellulose suspension to the sorbitan oleate solution, and stir and react at 50 °C for 20 minutes. Then, pour the obtained emulsion into a storage tank and dry it in a forced - air drying oven at 50 °C for 2 - 3 days to obtain sorbitan oleate - treated microfibrillated cellulose;

[0008] S3. Add the sorbitan oleate - treated microfibrillated cellulose obtained in step S2 to xylene, and stir at 90 °C for 30 minutes to obtain a microfibrillated cellulose / xylene suspension. Then, add the matrix of linear low - density polyethylene material prepared in step S1 to the microfibrillated cellulose / xylene suspension, stir at 120 °C for 30 minutes and then filter. Then, use 95% ethanol solution to wash the filtered microfibrillated cellulose / linear low - density polyethylene mixture multiple times. Finally, dry the washed microfibrillated cellulose / linear low - density polyethylene at 85 °C to obtain corrosion - resistant, high - hardness, recyclable microfibrillated cellulose / linear low - density polyethylene;

[0009] S4. Melt the corrosion - resistant, high - hardness, recyclable microfibrillated cellulose / linear low - density polyethylene prepared in step S3 and inject it into the injection molds of the volute and impeller to produce a corrosion - resistant, high - hardness, recyclable volute and impeller.

[0010] Preferably, the reactor used in step S1 is a spherical stirred - bed semi - batch reactor, including a mass flowmeter and a temperature control unit. The temperature is controlled by a cooling coil and an electric heater, and the tolerance of the polymerization temperature is set to ±0.2 °C.

[0011] Preferably, the catalyst used in step S1 is a Ziegler - Natta catalyst.

[0012] Preferably, the impeller is a cantilever closed backward-inclined centrifugal impeller, including an inner plate. A central hole is provided at the center of the inner plate. The driving shaft of the motor passes through the central hole of the inner plate and is fixedly connected to the inner plate through an impeller fixing sleeve. An outer ring is provided at the front end of the inner plate. The inner plate and the outer ring are connected by a plurality of arc-shaped blades, and an air duct is formed between adjacent arc-shaped blades.

[0013] Preferably, the volute includes a volute body. A conical inlet pipe is installed at the air inlet of the volute body. The air outlet of the conical inlet pipe is arranged facing the impeller. An air outlet flange is provided at the air outlet of the volute body. A cleaning hole is provided obliquely above the volute body, and a cleaning hole cover is covered on the cleaning hole. A drain hole is provided obliquely below the volute body, and a drain hole cover is covered on the drain hole. The impeller is installed in the cavity of the volute body.

[0014] Preferably, the frame includes a base. A volute front support protruding upward is provided at the front end of the base. A motor mounting seat protruding upward is provided at the rear end of the base. The motor is horizontally installed on the motor mounting seat. A volute rear fixing frame is provided at the front end of the motor mounting seat. The front end of the volute is fixed on the volute front support, and the rear end of the volute is fixed on the volute rear support.

[0015] The beneficial effects of the integrally recyclable high-efficiency energy-saving and anti-corrosion fan provided by the present invention are as follows: The integrally recyclable high-efficiency energy-saving and anti-corrosion fan has a simple structure, ingenious design, small volume, light weight, low production, maintenance, transportation and installation costs, good anti-corrosion effect. The volute and the impeller are made of corrosion-resistant and high-hardness recyclable linear low-density polyethylene, and the whole is recyclable and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a rear view of the three-dimensional structure of the present invention.

[0018] Figure 3 It is a front view of the present invention.

[0019] Figure 4 It is a schematic diagram of the partial structure assembly of the present invention.

[0020] Figure 5 It is an exploded view of the three-dimensional structure of the present invention.

[0021] In the figure: 1. Volute; 11. Volute body; 12. Conical air inlet pipe; 13. Air outlet flange; 14. Cleaning hole cover; 15. Drain hole cover; 16. Impeller fixing sleeve; 17. Air inlet; 2. Impeller; 21. Inner plate; 22. Outer ring; 23. Arc-shaped impeller; 3. Frame; 31. Base; 32. Front volute support; 33. Motor mounting seat; 34. Rear volute fixing frame; 4. Motor. Detailed implementation mode

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1: An integrally recyclable, highly efficient, energy-saving and anti-corrosion fan.

[0024] Refer to Figures 1 to 5 As shown, an integrally recyclable, highly efficient, energy-saving and anti-corrosion fan includes: a frame 3, the frame 3 includes a base 31, a front volute support 32 protruding upward is provided at the front end of the base 31, a motor mounting seat 33 protruding upward is provided at the rear end of the base 31, a motor 4 is horizontally mounted on the motor mounting seat 33, a rear volute fixing frame 34 is provided at the front end of the motor mounting seat 33, the front end of the volute 1 is fixed on the front volute support 31, and the rear end of the volute 1 is fixed on the rear volute support 34 to ensure the stable installation of the volute 1.

[0025] A volute 1 is installed on the frame 3, and the volute 1 includes a volute body 11. A conical air inlet pipe 12 is installed at the air inlet of the volute body 11, and the air outlet of the conical air inlet pipe 12 is arranged directly opposite to the impeller 2. Such a structural design can form a strong wind pressure through the conical air inlet pipe 12 when the impeller 2 rotates, which can ensure sufficient air volume. An air outlet flange 13 is provided at the air outlet of the volute body 11 to facilitate quick connection with an external pipeline. A cleaning hole is provided at the oblique upper side of the volute body 11, and a cleaning hole cover 14 is covered on the cleaning hole to facilitate cleaning inside the volute body 11. The volute body 11 A drain hole is provided obliquely below the volute body 11, and a drain hole cover 15 is provided on the drain hole to facilitate the drainage of the inside of the volute body 11. The impeller 2 is installed in the cavity of the volute body 11. The impeller 2 is a cantilever closed backward-inclined centrifugal impeller, including an inner plate 21, and a center hole is provided at the center of the inner plate 21. The driving shaft of the motor 4 passes through the center hole of the inner plate 21 and is fixedly connected to the inner plate 21 through the impeller fixing sleeve 16 to facilitate the installation and disassembly and maintenance of the impeller 2. The front end of the inner plate 21 is provided with an outer ring 22, and the inner plate 21 and the outer ring 22 are connected by a plurality of arc blades 23, and an air duct is formed between adjacent arc blades 23. The motor 4 is installed on the rear side of the volute 1 and connected to the impeller 2.

[0026] The volute 1 and the impeller 2 are both integrally injection molded with a self-made corrosion-resistant, high-hardness, recyclable linear low-density polyethylene material, and the corrosion-resistant, high-hardness, recyclable linear low-density polyethylene material is made in the following manner:

[0027] (1) A spherical stirred bed semi-batch reactor is used for polymerization to obtain a linear low-density polyethylene material matrix that meets the requirements. The spherical stirred bed semi-batch reactor is controlled by a mass flow meter and a temperature control unit. The temperature is controlled by a cooling coil and an electric heater. The tolerance of the polymerization temperature is set to ±0.2°C. Since the spherical stirred bed semi-batch reactor is operated intermittently in batch mode, all substances involved in the reaction, including catalysts, hydrogen and comonomers, are added to the reactor at one time except ethylene, and ethylene is fed continuously to maintain a constant pressure.

[0028] In actual operation, first, purge the semi-batch spherical stirred bed reactor with nitrogen at 115 °C for 1 hour to remove air, moisture, and impurities in the reactor. Then, at room temperature, add hexane solvent to the reactor and stir for 5 minutes. Next, inject the Ziegler-Natta catalyst slurry into the reactor and stir for 10 minutes to mix the catalyst slurry well with the hexane solvent. Then, inject 1-butene comonomer and hydrogen required for the reaction into the reactor, and continuously introduce ethylene gas at 0.5 Mpa into the reactor. Heat the reactor to 85 °C until polymerization for 1 h. After the polymerization ends, stop the ethylene flow to the reactor, quickly exhaust to reduce the reactor pressure, and remove unreacted substances. Wait until the temperature in the reactor drops to room temperature, then take out the obtained polymer, precipitate it in an ethanol solution, filter, and conduct vacuum drying to obtain the matrix of linear low-density polyethylene material.

[0029] (2) Add solid microfibrillated cellulose and deionized water to a blender at a mass ratio of 1:50 and stir evenly to prepare a 2% microfibrillated cellulose suspension. Add the 2% microfibrillated cellulose suspension to the sorbitan oleate solution and stir and react at 50 °C for 20 minutes. Then, pour the obtained emulsion into a storage tank and dry it in a forced-air drying oven at 50 °C for 2 - 3 days to obtain sorbitan oleate-treated microfibrillated cellulose. The purpose of treating microfibrillated cellulose with sorbitan oleate is to enhance the activity of microfibrillated cellulose, enabling it to better composite with the subsequent matrix of linear low-density polyethylene material, and thus obtaining a microfibrillated cellulose / linear low-density polyethylene composite with higher hardness and stronger corrosion resistance.

[0030] (3) Add the sorbitan oleate-treated microfibrillated cellulose obtained in step (2) to xylene and stir at 90 °C for 30 minutes to obtain a microfibrillated cellulose / xylene suspension. Then, add the matrix of linear low-density polyethylene material prepared in step (1) to the microfibrillated cellulose / xylene suspension, stir at 120 °C for 30 minutes and then filter. Then, use 95% ethanol solution to wash the filtered microfibrillated cellulose / linear low-density polyethylene mixture multiple times. Finally, dry the washed microfibrillated cellulose / linear low-density polyethylene at 85 °C to obtain corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene.

[0031] (4) Melt the corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene prepared in step (3) and inject it into the injection molds of the volute and impeller to prepare corrosion-resistant, high-hardness, recyclable volute and impeller.

[0032] Comparative Example 1

[0033] Without subjecting microfibrillated cellulose to sorbitan oleate treatment, the microfibrillated cellulose was directly added to xylene and compounded with the linear low-density polyethylene material matrix to obtain a microfibrillated cellulose / linear low-density polyethylene composite material without sorbitan oleate treatment.

[0034] Comparative Example 2

[0035] Without compounding microfibrillated cellulose with linear low-density polyethylene, the performance of the linear low-density polyethylene material matrix obtained in step (1) was directly tested.

[0036] The UV grade of the corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene obtained by the present invention is 8 and it has excellent flowability, meeting the requirements for injection molding of products with complex structures and high requirements for hardness and corrosion resistance. The material properties of Example 1 and Comparative Examples 1-2 were tested, and the performances are as follows:

[0037] Table 1 Material Properties of Example 1 and Comparative Examples 1-2

[0038]

[0039]

[0040] From the data in Example 1, it can be seen that the corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene material prepared by the present invention has the characteristics of corrosion resistance and high hardness. Its corrosion reduction rate is 10%, and the Shore hardness is 65, well meeting the high-hardness and corrosion-resistant performance requirements during the manufacturing and use of the fan volute and impeller. Moreover, the corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene material prepared by the present invention has the characteristic of melt recyclability. Therefore, the volute and impeller are made of this corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene, and the whole can be recycled, which is environmentally friendly.

[0041] Comparing the data of Example 1 and Comparative Example 1, it can be seen that if the microfibrillated cellulose is not subjected to sorbitan oleate treatment, the microfibrillated cellulose is directly added to xylene and compounded with the linear low-density polyethylene material matrix, the compounding efficiency of the microfibrillated cellulose and the linear low-density polyethylene material matrix is very poor, and the hardness and corrosion resistance of the finally obtained microfibrillated cellulose / linear low-density polyethylene composite material without sorbitan oleate treatment have not been greatly improved.

[0042] By comparing the data of Comparative Example 1 and Comparative Example 2, it can be seen that after the microfibrillated cellulose is treated with sorbitan oleate and compounded with the matrix of linear low-density polyethylene material, the obtained microfibrillated cellulose / linear low-density polyethylene composite material has been greatly improved in terms of strength performance, hardness and corrosion resistance. Moreover, the microfibrillated cellulose / linear low-density polyethylene composite material, as a recyclable environmental protection material, can be recycled and is environmentally friendly.

[0043] The overall recyclable high-efficiency energy-saving anti-corrosion fan has a simple structure, ingenious design, small size, light weight, low production, maintenance, transportation and installation costs, and good anti-corrosion effect. The volute and impeller are made of corrosion-resistant and high-hardness recyclable linear low-density polyethylene, and the whole is recyclable and environmentally friendly.

[0044] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the drawings. Therefore, all equivalent or modified completions made without departing from the spirit disclosed by the present invention fall within the protection scope of the present invention.

Claims

1. An integrally recyclable, highly energy-efficient and anti-corrosion fan, comprising: Frame, a volute is installed on the frame, an impeller is installed in the volute, and a motor is installed on the rear side of the volute and connected to the impeller. It is characterized in that: both the volute and the impeller are integrally injection-molded from a corrosion-resistant, high-hardness, recyclable linear low-density polyethylene material, and the corrosion-resistant, high-hardness, recyclable linear low-density polyethylene material is made by the following method: S1. Use nitrogen gas at 110 - 120 °C to purge the reactor for 1 - 2 hours to remove air, moisture and impurities in the reactor. Then, at room temperature, add hexane solvent to the reactor and stir for 5 - 10 minutes. Then inject the Ziegler-Natta catalyst slurry into the reactor and stir for 5 - 15 minutes to mix the Ziegler-Natta catalyst slurry with the hexane solvent well. Then inject 1-butene comonomer and the required hydrogen for the reaction into the reactor, and continuously introduce ethylene gas at 0.5 Mpa into the reactor. Heat the reactor to 80 - 90 °C until polymerization for 1 h. After the polymerization ends, stop the ethylene flow to the reactor, quickly exhaust to reduce the reactor pressure, and remove the unreacted substances. Wait until the temperature in the reactor drops to room temperature, take out the obtained polymer, precipitate it in an ethanol solution, filter it, and perform vacuum drying to obtain the linear low-density polyethylene material matrix; S2. Add solid microfibrillated cellulose and deionized water to a blender at a mass ratio of 1:50 and stir evenly to make a 2% mass fraction microfibrillated cellulose suspension. Add the 2% microfibrillated cellulose suspension to the sorbitan oleate solution and stir and react at 50 °C for 20 minutes. Then pour the obtained emulsion into a storage tank and dry it in a forced-air drying oven at 50 °C for 2 - 3 days to obtain sorbitan oleate-treated microfibrillated cellulose; S3. Add the sorbitan oleate-treated microfibrillated cellulose obtained in step S2 to xylene and stir at 90 °C for 30 minutes to obtain a microfibrillated cellulose / xylene suspension. Then add the linear low-density polyethylene material matrix prepared in step S1 to the microfibrillated cellulose / xylene suspension, stir at 120 °C for 30 minutes and then filter. Then use a 95% ethanol solution to wash the filtered microfibrillated cellulose / linear low-density polyethylene mixture multiple times. Finally, dry the washed microfibrillated cellulose / linear low-density polyethylene at 85 °C to obtain a corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene; S4. Melt the corrosion-resistant, high-hardness, recyclable microfibrillated cellulose / linear low-density polyethylene prepared in step S3 and inject it into the injection molds of the volute and the impeller to make the corrosion-resistant, high-hardness, recyclable volute and impeller.

2. The overall recyclable, highly energy-efficient and anti-corrosion fan according to claim 1, characterized in that: The reactor used in step S1 is a spherical stirred-bed semi-batch reactor, including a mass flowmeter and a temperature control unit. The temperature is controlled by a cooling coil and an electric heater, and the tolerance of the polymerization temperature is set to ±0.2 °C.

3. The overall recyclable, highly energy-efficient and anti-corrosion fan according to claim 1, characterized in that: The impeller is a cantilever closed - type backward - inclined centrifugal impeller, including an inner plate. A central hole is provided at the center of the inner plate. The driving shaft of the motor passes through the central hole of the inner plate and is fixedly connected to the inner plate through an impeller fixing sleeve. An outer ring is provided at the front end of the inner plate. The inner plate and the outer ring are connected by a plurality of arc - shaped blades, and an air duct is formed between adjacent arc - shaped blades.

4. The overall recyclable, highly energy-efficient and anti-corrosion fan according to claim 1, characterized in that: The volute includes a volute body. A conical inlet pipe is installed at the air inlet of the volute body. The air outlet of the conical inlet pipe is arranged facing the impeller. An air outlet flange is provided at the air outlet of the volute body. A cleaning hole is provided obliquely above the volute body, and a cleaning hole cover is covered on the cleaning hole. A drain hole is provided obliquely below the volute body, and a drain hole cover is covered on the drain hole. The impeller is installed in the cavity of the volute body.

5. The overall recyclable, highly energy-efficient and anti-corrosion fan according to claim 1, characterized in that: The frame includes a base. A volute front support protruding upward is provided at the front end of the base. A motor mounting seat protruding upward is provided at the rear end of the base. The motor is horizontally installed on the motor mounting seat. A volute rear fixing frame is provided at the front end of the motor mounting seat. The front end of the volute is fixed on the volute front support, and the rear end of the volute is fixed on the volute rear support.

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