Corrosion-resistant and temperature-resistant coating and fan volute applying same

Abstract

The invention discloses an anti-corrosion and temperature-resistant coating and a fan volute applying the same. The invention relates to an anti-corrosion temperature-resistant coating, which is prepared from the following components in parts by weight: 55 to 72 parts of SiO2, 5 to 15 parts of Na2O, 0.05 to 0.15 part of Fe2O3, 1 to 3 parts of MgO, 1 to 5 parts of CaO, 20 to 25 parts of B2O3 and 0.01 to 0.03 part of TiO2. The volute body is made of metal materials, and the surface of the volute body or only the inner surface of the volute body is covered with the anti-corrosion temperature-resistant coating. The corrosion-resistant temperature-resistant coating provided by the invention has excellent high temperature resistance, strong acid resistance, strong alkali resistance and chloride ion corrosion resistance, so that the volute can be safely used in a corrosive medium-containing environment. Furthermore, the fan volute further comprises a plurality of radiating fins fixed on the volute front cover and a cooling coil installed on the volute rear wall. The combination of the cooling fins and the cooling coil can play a good role in heat dissipation, and normal operation of the fan is prevented from being affected by too high temperature. The volute has the advantages of being excellent in corrosion resistance, good in heat dissipation effect, low in manufacturing cost and the like, and is suitable for being used under high-temperature corrosive media.

Description

Technical Field

[0001] The present invention relates to the field of centrifugal fans, and more particularly to an anti-corrosion and temperature-resistant coating and a fan volute applying the coating. Background Art

[0002] A centrifugal fan is a driven fluid machine that relies on input mechanical energy to increase gas pressure and discharge the gas. Centrifugal fans are widely used for ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; and for ventilation and draft control in boilers and industrial furnaces.

[0003] In the chemical industry, pipelines often transport corrosive media, resulting in harsh operating environments for fans. Traditional fans often fail to meet these requirements, necessitating the design and manufacture of specialized fans to meet these requirements. For example, when a fan transports media containing corrosive gases such as hydrogen chloride and chlorine, its service life is impacted. To ensure safe and stable operation in corrosive environments, fans must be constructed from corrosion-resistant metals or coated with an anti-corrosion coating. However, due to the large size of the fan volute, manufacturing the entire volute out of corrosion-resistant metal significantly increases costs. Therefore, using an anti-corrosion coating is the most cost-effective and effective approach. Besides being corrosive, the transported media often also have high temperatures. During fan operation, the inhaled media contains significant heat, which transfers heat to the fan, causing the fan to heat up. Excessive temperatures can affect the performance of the fan's materials and threaten its operation. Therefore, the coating applied to the volute of a centrifugal fan must be both corrosion-resistant and heat-resistant. Currently, the commonly used high-temperature resistant anti-corrosion coating is epoxy resin coating, which has good high-temperature resistant anti-corrosion effect. However, its weather resistance is poor and it is easy to powder. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to propose an anti-corrosion and temperature-resistant coating and a fan volute applying the coating, so that the fan volute has good anti-corrosion and temperature-resistant effects. Furthermore, by adopting a combination of heat dissipation fins and cooling coils, the fan volute also has good heat dissipation effects.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The invention provides an anti-corrosion and temperature-resistant coating, which comprises 55-72 parts by weight of SiO2, 5-15 parts by weight of Na2O, 0.05-0.15 parts by weight of Fe2O3, 1-3 parts by weight of MgO, 1-5 parts by weight of CaO, 20-25 parts by weight of B2O3 and 0.01-0.03 parts by weight of TiO2.

[0007] Preferably, the composition is 60 parts by weight of SiO2, 10 parts by weight of Na2O, 0.1 parts by weight of Fe2O3, 2 parts by weight of MgO, 3 parts by weight of CaO, 25 parts by weight of B2O3 and 0.02 parts by weight of TiO2.

[0008] On the other hand, the present invention provides a fan volute, including a volute body, characterized in that the volute body is made of metal material, the surface of which is covered with the above-mentioned anti-corrosion and heat-resistant coating, or only the inner surface of the volute body is covered with the above-mentioned anti-corrosion and heat-resistant coating.

[0009] Furthermore, the volute body includes a volute front cover and a volute rear wall, wherein the volute front cover is sealably mounted on the volute rear wall, and a large cavity is formed in the middle after the volute front cover and the volute rear wall are sealed and connected, and the cavity is used to place the impeller and the shaft and to form a channel for conveying the medium; an air inlet is provided on the volute front cover, and an air outlet is provided on the volute rear wall.

[0010] Furthermore, the fan volute also includes a mounting seat, which is fixed on the rear wall of the volute and is used for fixed installation of the fan volute.

[0011] Furthermore, the corners of the volute body are all provided with rounded corners or inclined surfaces, and the rounded corner radius is greater than 3 mm, preferably the rounded corner radius is 5 mm.

[0012] Furthermore, the fan volute also includes a plurality of heat dissipation fins fixed on the volute front cover and a cooling coil installed on the volute rear wall, and the heat dissipation fins are radially installed on the outside of the volute front cover.

[0013] Furthermore, viewed from the Z-axis direction, the outer edge of the heat dissipating fin is flush with the outer edge of the volute front cover.

[0014] Furthermore, the water inlet of the cooling coil is arranged at the upper part of the volute, and the water outlet is arranged at the lower part of the volute. Preferably, the water inlet and the water outlet are arranged on the same side of the volute.

[0015] Preferably, the cross-section of the cooling coil is semicircular.

[0016] The specific method for covering the surface of the volute body or only the inner surface with the anti-corrosion and heat-resistant coating is as follows: 20-25 parts by volume of a binder are added to 100 parts by weight of the anti-corrosion and heat-resistant coating, and stirred evenly to form a coating mixture; the binder is a mixture of polystyrene and xylene, and the weight-to-volume ratio of polystyrene to xylene is 1:6-1:7.

[0017] The coating mixture is applied on the surface of the volute body or the inner surface of the volute body, dried and then placed in a heat treatment furnace for sintering. After sintering, a dense corrosion-resistant and heat-resistant coating is formed. The sintering temperature is 650°C-720°C, preferably 700°C.

[0018] Beneficial effects of the present invention:

[0019] 1. The anti-corrosion and temperature-resistant coating provided by the present invention has excellent high temperature resistance, resistance to strong acid, strong alkali and chloride ion corrosion, and allows the volute to be safely used in an environment containing corrosive media.

[0020] 2. The heat dissipation fins and cooling coils on the volute body can play a good heat dissipation role. The heat dissipation fins can effectively transfer heat to the surrounding environment. The cooling coil is set to be semicircular. The cooling water flowing through the cooling coil will fully contact the rear wall of the volute. The cooling water is used to cool the volute to prevent excessive temperature from affecting the mechanical properties of the volute.

[0021] 3. The fan volute adopts anti-corrosion and heat-resistant coating and heat dissipation structure, which can be used in high-temperature corrosive environment, with good heat dissipation effect and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the fan volute of the present invention.

[0023] Figure 2 It is a left side view of the fan volute of the present invention.

[0024] Figure 3 It is a rear view of the fan volute of the present invention.

[0025] Figure 4 It is a cross-sectional view of the fan volute of the present invention.

[0026] In the figure: 1-volute front cover, 2-volute rear wall, 3-air inlet, 4-air outlet, 5-heat sink fins, 6-cooling coil, 7-mounting base, 8-cooling coil water inlet, 9-cooling coil water outlet. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] like Figures 1 to 4As shown, the fan volute in this embodiment includes a volute body and a mounting seat (7), wherein the volute body includes a volute front cover (1) and a volute rear wall (2), wherein the volute front cover (1) is sealed and mounted on the volute rear wall (2), and the volute front cover (1) and the volute rear wall (2) form a large cavity in the middle after being sealed and connected, and the cavity is used to place the impeller and the shaft and form a channel for conveying medium; the volute front cover (1) is provided with an air inlet (3), and the volute rear wall (2) is provided with an air outlet (4); the mounting seat (7) is fixed on the volute rear wall (2) for fixed installation of the fan volute. The conveying medium enters from the air inlet (3), is driven to rotate by the impeller in the cavity, and is discharged from the air outlet (4). Preferably, the mounting seat (7) is arranged in the middle of both sides of the volute rear wall (2), which can effectively reduce the vibration of the fan volute system. During installation, a ground boss can be constructed to connect with the mounting seat (7). In order to make the fan volute have anti-corrosion and heat-resistant functions, the surface of the volute body is covered with an anti-corrosion and heat-resistant coating. The composition of the anti-corrosion and heat-resistant coating is preferably 60 parts by weight of SiO2, 10 parts by weight of Na2O, 0.1 parts by weight of Fe2O3, 3 parts by weight of MgO2, 3 parts by weight of CaO, 25 parts by weight of B2O3 and 0.02 parts by weight of TiO2. When the fan volute is transported in a pipeline, the outer surface of the volute is usually in contact with the atmosphere, and the inner surface is in contact with corrosive gases. Therefore, in order to save costs, only the inner surface of the volute body is covered with an anti-corrosion and heat-resistant coating. Optionally, the volute body is made of stainless steel. The anti-corrosion and heat-resistant coating sprayed on the inner surface of the volute body enhances the corrosion resistance of the volute. The volute body is made of stainless steel, and the strength is guaranteed, while greatly reducing the production and manufacturing costs. Furthermore, in order to reduce the dead angles covered by the coating, the corners of the volute body are provided with chamfers or bevels, preferably with a chamfer radius of 5mm.

[0029] Furthermore, the fan volute also includes a plurality of heat dissipation fins (5) fixed on the volute front cover (1) and a cooling coil (6) installed on the volute rear wall (2), wherein the heat dissipation fins (5) are radially installed on the outside of the volute front cover (1). The volute is cooled by the combination of the heat dissipation fins (5) and the cooling coil (6). Preferably, when viewed from the Z-axis direction, the outer edge of the heat dissipation fins (5) is flush with the outer edge of the volute front cover (1). The water inlet (8) of the cooling coil (6) is arranged at the upper part of the volute, and the water outlet (9) is arranged at the lower part of the volute. Such an arrangement is conducive to the flow of cold water in the pipeline and can better take away the heat of the volute. The water inlet (8) and the water outlet (9) are arranged on the same side of the volute and are connected to the water pump. Preferably, the cross-section of the cooling coil (6) is semicircular, which increases the contact area between the cooling water and the wall. When the fan is running, the flow of high-temperature flue gas will cause the temperature of the volute to rise, while the heat dissipation fins (5) arranged on the front cover of the volute and the cooling coil (6) arranged on the rear wall of the volute can effectively reduce the temperature of the volute, achieve a good heat dissipation effect, reduce the temperature of the volute, and facilitate the long-term use of the fan.

[0030] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention. These improvements and modifications also fall within the scope of protection required by the present invention.

Claims

1. An anti-corrosion and temperature-resistant coating, characterized in that: The composition is 55-72 parts by weight of SiO2, 5-15 parts by weight of Na2O, 0.05-0.15 parts by weight of Fe2O3, 1-3 parts by weight of MgO, 1-5 parts by weight of CaO, 20-25 parts by weight of B2O3 and 0.01-0.03 parts by weight of TiO2.

2. The anticorrosion and temperature-resistant coating according to claim 1, characterized in that: The composition is 60 parts by weight of SiO2, 10 parts by weight of Na2O, 0.1 parts by weight of Fe2O3, 2 parts by weight of MgO, 3 parts by weight of CaO, 25 parts by weight of B2O3 and 0.02 parts by weight of TiO2.

3. A fan volute, comprising a volute body, characterized in that: The volute body is made of metal material, and its surface is covered with the anti-corrosion and heat-resistant coating as claimed in claim 1 or 2, or only the inner surface of the volute body is covered with the anti-corrosion and heat-resistant coating as claimed in claim 1 or 2.

4. The fan volute according to claim 3, characterized in that: The volute body includes a volute front cover and a volute rear wall, wherein the volute front cover is sealably mounted on the volute rear wall. After the volute front cover and the volute rear wall are sealed and connected, a large cavity is formed in the middle. The cavity is used to place the impeller and the shaft and to form a channel for conveying the medium. An air inlet is provided on the volute front cover, and an air outlet is provided on the volute rear wall.

5. The fan volute according to claim 4, characterized in that: It also includes a mounting base, which is fixed on the rear wall of the volute and is used for fixed installation of the fan volute.

6. The fan volute according to claim 3, characterized in that: The corners of the volute body are all provided with rounded corners or inclined surfaces, and the rounded corner radius is greater than 3mm.

7. The fan volute according to claim 6, characterized in that: The fillet radius is 5 mm.

8. The fan volute according to any one of claims 4 to 7, characterized in that: The invention also comprises a plurality of heat dissipation fins fixed on the front cover of the volute and a cooling coil installed on the rear wall of the volute. The heat dissipation fins are radially installed on the outer side of the front cover of the volute.

9. The fan volute according to claim 8, characterized in that: Viewed from the Z-axis direction, the outer edge of the heat dissipation fin is flush with the outer edge of the volute front cover; the water inlet of the cooling coil is arranged at the upper part of the volute, and the water outlet is arranged at the lower part of the volute, and the water inlet and outlet are arranged on the same side of the volute.

10. The fan volute according to claim 9, characterized in that: The cross section of the cooling coil is semicircular.

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