Spark-proof impeller
By applying multiple layers of spark-proof coating on impellers used in flammable and explosive environments under coal mines, the problem of explosion accidents caused by sparks caused by high-speed rotation is solved, and the effect of improving equipment safety is achieved.
Patent Information
- Application Number
- CN202421336827.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-13
AI Technical Summary
In the flammable and explosive environment underground in coal mines, the impellers of pumps, fans and other equipment rotate at high speed due to mechanical impact, friction or high temperature, resulting in explosion accidents, and the existing technology is difficult to meet the requirements of safe use.
The impeller body made of carbon steel or cast steel is coated with multi-layer spark-resistant coating on its outer surface, including chromium-nickel alloy base coating, magnesium-aluminum spinel transition coating and TiCN surface coating, improving the impeller's corrosion resistance, high temperature resistance, high strength and low friction coefficient.
By improving the corrosion resistance, high temperature resistance, high strength and reduced friction coefficient of the impeller, the risk of sparks caused by friction and impact during high-speed operation is significantly reduced, and the safety of the equipment is improved.
Smart Images
Figure CN222717129U_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of pump impellers and fan impellers, and in particular to an anti-spark impeller used in underground coal mines and in flammable and explosive environments. Background Art
[0002] At present, for mechanical equipment in underground coal mines and in flammable and explosive environments, especially pumps, fans and other equipment, the impellers generate sparks due to mechanical impact, friction or high temperature during high-speed rotation, thus causing explosion accidents. Ordinary impellers cannot meet the safety requirements, and stainless steel impellers have the disadvantages of high processing difficulty, high welding and forming difficulty, and high cost. Therefore, spark-proof impellers that are easy to process, have stable performance and low cost have become one of the main problems that need to be solved urgently. Summary of the invention
[0003] The purpose of the utility model is to overcome the above-mentioned problems of the prior art and provide a spark-proof impeller, which reduces the risk of sparks generated by friction and impact by improving the corrosion resistance, high temperature resistance, high strength and reducing the friction coefficient of the impeller.
[0004] The utility model adopts a technical solution to solve the above technical problems: an anti-spark impeller, comprising: an impeller body (parent material), and an anti-spark coating coated on the outer surface of the impeller.
[0005] Furthermore, the impeller body (parent material) is a pump impeller or a fan impeller made of carbon steel or cast steel.
[0006] Furthermore, the coating thickness on the outer surface of the impeller is 0.0005-2.5 mm.
[0007] Furthermore, the anti-spark coating is a base coating, a transition coating, and a surface coating.
[0008] Furthermore, the bottom coating is a chromium-nickel alloy coating.
[0009] Furthermore, the transition coating is a magnesium-aluminum spinel coating.
[0010] Furthermore, the surface coating is a TiCN coating.
[0011] The beneficial effects of the utility model are as follows: the impeller adopts an anti-spark coating on the outer surface, which has different characteristics of high thermal conductivity, corrosion resistance, high temperature resistance, high strength and low friction coefficient, and is not easy to generate sparks even when it contacts other parts during high-speed operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the coating structure in an embodiment of the present utility model.
[0013] Among them: 10-impeller body (parent material), 20-base coating (chromium-nickel alloy coating), 30-transition coating (magnesium-aluminum spinel coating), 40-surface coating (TiCN coating).
[0014] Figure 2 This is a flow chart of the impeller manufacturing method in an embodiment of the present utility model. DETAILED DESCRIPTION
[0015] The present invention is further described below with reference to the accompanying drawings and embodiments, but is not intended to be limiting of the present invention.
[0016] See also Figure 1 A spark-proof impeller comprises: an impeller body (parent material) 10, and an impeller outer surface coated with a spark-proof coating (a base coating 20, a transition coating 30, and a surface coating 40).
[0017] like Figure 2 As shown, the process GX100 of the impeller body 10 is first performed, then the process GX200 of the base coating 20 is performed, then the process GX300 of the transition coating 30 is performed, and then the process GX400 of the surface coating 40 is performed.
[0018] The base coating 20 covers the surface of the impeller body 10 and is formed in the following manner: the impeller body 10 is sandblasted to a cleanliness standard of SA2.5 or higher to ensure that there is no oil, scale and other impurities, and a plasma spray coating technology is used to evenly cover the surface of the impeller body 10 to form a chromium-nickel alloy coating. As the first layer that directly contacts the metal substrate of the impeller body 10, the chromium-nickel alloy base coating provides excellent corrosion resistance and good adhesion. Its high temperature resistance and stability also provide a reliable base for subsequent coatings.
[0019] The transition coating 30 covers the surface of the underlying coating 20 and is formed in the following manner: a plasma spray coating technique is used to uniformly cover the surface of the underlying coating 20 to form a magnesium-aluminum spinel coating, which is used as a transition coating with its excellent high temperature resistance, wear resistance and thermal shock resistance to further enhance the mechanical strength and thermal stability of the coating system. It can effectively resist wear and erosion in high temperature environments, ensure that the transition coating is fully combined with the underlying layer, and provide a good bonding interface for the surface TiCN coating.
[0020] The surface coating 40 covers the surface of the transition coating 30 and is formed by using a physical vapor deposition coating technology to uniformly cover the surface of the transition coating 30 to form a TiCN coating, which provides extremely high hardness, wear resistance and low friction characteristics, as well as good anti-adhesion properties.
[0021] The thickness of each coating is 0.0005~2.5mm.
[0022] By adjusting the thickness of the base coating 20, the transition coating 30 and the surface coating 40, a spark-proof impeller with high thermal conductivity, corrosion resistance, high temperature resistance, high strength and low friction coefficient having different characteristics can be obtained, which is not easy to generate sparks even when in contact with other components during high-speed operation.
Claims
1. A spark-proof impeller, comprising: an impeller body and an impeller coating, characterized in that: The impeller body is a pump impeller or a fan impeller made of carbon steel or cast steel, and the outer surface of the impeller is coated with a coating, and the thickness of the coating coated on the outer surface of the impeller is 0.0005~2.5mm. It is characterized in that the coating coated on the outer surface of the impeller is a base coating, a transition coating, and a surface coating, the base coating is a chromium-nickel alloy coating, the transition coating is a magnesium-aluminum spinel coating, and the surface coating is a TiCN coating.