Multifunctional composite connecting rod for molten aluminum pump

Abstract

The utility model discloses a multifunctional composite connecting rod for a molten aluminum pump, which comprises a composite connecting rod structure used for connecting an impeller in the molten aluminum pump, the composite connecting rod structure comprises a core shaft and a protective layer, the core shaft is a metal material rod, and the lower end of the core shaft is fixedly connected with the upper end of the impeller; the protective layer comprises an anti-expansion heat insulation layer and a high-strength composite ceramic refractory layer, the anti-expansion heat insulation layer wraps the core shaft, the high-strength composite ceramic refractory layer is poured outside the anti-expansion heat insulation layer, and no gap exists between the anti-expansion heat insulation layer and the impeller and between the high-strength composite ceramic refractory layer and the impeller. The anti-expansion heat insulation layer is a nanofiber felt heat insulation layer, and the high-strength composite ceramic refractory material layer is formed by prefabricating a stainless steel mesh and a ceramic material layer. The utility model has the advantages of low manufacturing and use cost, high strength in a high temperature environment, long service life and degassing function.

Description

Technical Field

[0001] The utility model belongs to the technical field of aluminum liquid pumps, and in particular relates to a multifunctional composite connecting rod used for aluminum liquid pumps. Background Art

[0002] Aluminum liquid pumps are mainly used to pump high-temperature metal solutions such as aluminum liquid. At present, the connecting rod used to connect the impeller inside the aluminum liquid pump is mainly a graphite connecting rod. However, as an aluminum liquid pump accessory, graphite connecting rods have the following problems: Although graphite itself has good high temperature resistance and corrosion resistance, when used in high-temperature aluminum liquid, the material is easily oxidized by oxygen in the air at high temperatures and loses its strength, resulting in a short service life. In addition, graphite materials are expensive and have high use costs.

[0003] In order to solve the above problems, a Chinese patent with announcement number CN206891166U discloses a connecting rod for stirring aluminum water graphite disk, including a graphite disk, a connecting block fixedly connected between the inner walls of both sides of the graphite disk, a groove provided in the connecting block, and a connecting rod provided in the groove, a main rod fixed at the inner center of the connecting rod, a fixed sleeve is sleeved on the outside of the main rod, a plurality of mounting grooves are evenly arranged around one side of the outer wall of the fixed sleeve, and a support rod is provided in each mounting groove, a ferrule is sleeved on the outside of the connecting rod, an annular block is arranged around one side of the outer wall of the ferrule, a locking block is arranged around the bottom of the annular block along the edge, a plurality of fixed rods are symmetrically fixed at equal distances on both sides of the graphite disk, and a stirring wheel is provided at one end of each fixed rod away from the graphite disk. This scheme provides a connecting rod with a simple structure, easy operation and long service life, and improves its firmness and service life through the design and structural optimization of the connecting rod, which helps to reduce problems occurring during use.

[0004] A Chinese patent with announcement number CN204286080U discloses a connecting rod for stirring aluminum water graphite disk, comprising: an iron shaft, a graphite rod, and a base; the graphite rod is an integrated structure; the iron shaft is connected to the graphite rod, and the graphite rod is arranged on the base; the length of the graphite rod is 0.35m; the scheme adopts an overall shorter graphite rod to replace the original two connected longer graphite rods, so that the graphite rod will not break after working for a long time; a two-section connection is adopted to replace the original three-section connection, so as to reduce the error and make the connecting rod of the stirring aluminum water graphite disk not easy to be eccentric.

[0005] In addition, the existing solutions to the damage problem of graphite equipment are to improve the preparation process of graphite materials, optimize the equipment structure design, etc. The above solution can indirectly solve the problem that occurs when the graphite connecting rod is used in aluminum liquid pump accessories.

[0006] Although the above-mentioned documents disclose some solutions, they still need to be selected and adjusted according to specific circumstances during use, and regular inspection and maintenance are required to ensure the normal use of graphite connecting rods. In addition, the manufacturing and use costs of graphite connecting rods are high, and the problem of affecting service life under high temperatures still exists. Utility Model Content

[0007] The utility model aims to provide a multifunctional composite connecting rod for an aluminum liquid pump, so as to solve the technical defects in the prior art that the graphite connecting rod used in the aluminum liquid pump has a short service life and a high manufacturing and using cost.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A multifunctional composite connecting rod for an aluminum liquid pump comprises a composite connecting rod structure for connecting an impeller inside the aluminum liquid pump, wherein the composite connecting rod structure comprises a core shaft and a protective layer.

[0010] Among them, the core shaft is a metal rod, and the lower end of the core shaft is fixedly connected to the upper end of the impeller.

[0011] The protective layer includes an anti-expansion insulation layer and a high-strength composite ceramic refractory layer. The anti-expansion insulation layer is coated on the outside of the core shaft, and the high-strength composite ceramic refractory layer is cast on the outside of the anti-expansion insulation layer. There is no gap between the anti-expansion insulation layer and the high-strength composite ceramic refractory layer and the impeller.

[0012] As a preferred embodiment of the present invention, the anti-expansion thermal insulation layer is a nanofiber felt thermal insulation layer.

[0013] As a preferred embodiment of the utility model, the high-strength composite ceramic refractory layer is prefabricated with stainless steel fibers, stainless steel mesh and ceramic powder. The stainless steel fibers are combined with the stainless steel mesh and mixed in the ceramic powder to improve the thermal shock resistance and service life of the composite ceramic.

[0014] As a preferred solution of the utility model, a cooling assembly is provided at the upper end of the core shaft away from the impeller.

[0015] As a further solution of the utility model, the core shaft has an internal hollow structure, and the lower end of the core shaft connected to the impeller is provided with a plurality of small-diameter exhaust holes communicated with the interior thereof, and the plurality of small-diameter exhaust holes are located on the same plane and extend to the outer side of the impeller.

[0016] The cooling assembly includes a connecting seat and a gas rotating joint. The connecting seat is fixedly installed at the upper end of the core shaft away from the impeller. The lower end of the gas rotating joint is fixedly installed at the upper end of the connecting seat away from the core shaft. The upper end of the gas rotating joint is connected to the cooling nitrogen supply pipe. The gas rotating joint is connected to the interior of the core shaft through the cavity inside the connecting seat.

[0017] As a preferred solution of the utility model, a pulley is fixedly mounted on the connecting seat.

[0018] Compared with the prior art, the multifunctional composite connecting rod for a molten aluminum pump provided by the utility model has the following beneficial effects:

[0019] 1. The core shaft of the utility model adopts a metal rod. Compared with the existing graphite material, the strength is increased several times under the same diameter condition, and the core shaft can be reused, the manufacturing cost is low, and it can still maintain high strength and service life in a high temperature environment.

[0020] 2. The middle anti-expansion insulation layer adopts insulating nanofiber felt material, which uses the elasticity of the material to eliminate the pressure of the expansion of the steel material at high temperature on the high-strength composite ceramic refractory layer, and uses the thermal insulation of the material to prevent heat from being transferred from the high-strength composite ceramic refractory layer to the core axis, thus having a heat insulation function.

[0021] 3. The high-strength composite ceramic refractory layer is prefabricated from a stainless steel mesh combined with stainless steel fibers and ceramic powder. It utilizes the high temperature resistance and corrosion and oxidation resistance of the ceramic material in molten aluminum and has a long service life.

[0022] 4. The cooling component is installed at one end of the core shaft through the gas rotary joint to introduce nitrogen, and then transport it to the exhaust hole through the inner cavity of the core shaft to discharge the heat in the core shaft. The discharged nitrogen can also form a nitrogen protective layer on the surface of the aluminum liquid to prevent the oxidation of the surface aluminum liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only examples of the embodiment of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic cross-sectional structural diagram of an embodiment of the utility model.

[0025] Reference numerals:

[0026] 1. Impeller; 2. Core shaft; 3. High-strength composite ceramic refractory layer; 4. Anti-expansion insulation layer; 5. Connecting seat; 6. Pulley; 7. Gas rotary joint; 8. Exhaust hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model more clear, the embodiment of the utility model is further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0030] See attached Figure 1 As shown, an embodiment of the utility model is a multifunctional composite connecting rod for an aluminum liquid pump, including a composite connecting rod structure for connecting an impeller 1 inside the aluminum liquid pump, the composite connecting rod structure includes a core shaft 2 and a protective layer, and the impeller 1 is a graphite impeller.

[0031] The core shaft 2 is a metal rod, and the lower end of the core shaft 2 is fixedly connected to the upper end of the impeller 1 .

[0032] The protective layer includes an anti-expansion insulation layer 4 and a high-strength composite ceramic refractory layer 3. The anti-expansion insulation layer 4 is coated on the outside of the core shaft 2, and the high-strength composite ceramic refractory layer 3 is cast on the outside of the anti-expansion insulation layer 4. There is no gap between the anti-expansion insulation layer 4 and the high-strength composite ceramic refractory layer 3 and the impeller 1.

[0033] In the embodiment of the utility model, in order to ensure the heat insulation effect, the anti-expansion insulation layer 4 is a nanofiber felt insulation layer.

[0034] The high-strength composite ceramic refractory layer 3 is prefabricated by combining a stainless steel mesh with stainless steel fibers and a ceramic material layer.

[0035] In order to dissipate heat from the core shaft 2 and ensure the service life of the core shaft 2 , a cooling component is provided at the upper end of the core shaft 2 away from the impeller 1 .

[0036] In the embodiment of the utility model, the core shaft 2 has a hollow structure inside, and the lower end of the core shaft 2 connected to the impeller 1 is provided with a plurality of small-diameter exhaust holes communicating with the inside thereof, and the plurality of small-diameter exhaust holes are located on the same plane and extend to the outer side of the impeller 1, such as Figure 1As shown, the exhaust hole 8 extends from the core shaft 2 of the hollow structure to the outside of the impeller 1.

[0037] The cooling assembly includes a connecting seat 5 and a gas rotating joint 7. The connecting seat 5 is fixedly installed on the upper end of the core shaft 2 away from the impeller 1. The lower end of the gas rotating joint 7 is fixedly installed on the upper end of the connecting seat 5 away from the core shaft 2. The upper end of the gas rotating joint 7 is connected to the cooling nitrogen supply pipe. The gas rotating joint 7 is connected to the interior of the core shaft 2 through the cavity inside the connecting seat 5.

[0038] In order to facilitate the driving of the core shaft 2 to drive the impeller 1 to rotate, a pulley 6 is fixedly mounted on the connecting seat 5.

[0039] The multifunctional composite connecting rod of a liquid aluminum pump in an embodiment of the utility model is mainly composed of a core shaft 2, an anti-expansion insulation layer 4, a high-strength composite ceramic refractory layer 3 and a cooling component. The core shaft 2 is made of a metal material rod. Compared with the existing graphite material, the strength is increased several times under the same diameter conditions, and the core shaft 2 is reusable.

[0040] The middle anti-expansion insulation layer 4 is made of insulating nanofiber felt material, which uses the elasticity of the material to eliminate the pressure on the high-strength composite ceramic refractory layer 3 caused by the expansion of the steel material at high temperature, and uses the thermal insulation of the material to prevent heat from being transferred from the high-strength composite ceramic refractory layer 3 to the core shaft 2.

[0041] The high-strength composite ceramic refractory layer 3 is prefabricated from a stainless steel mesh combined with stainless steel fibers and ceramic materials, and utilizes the high temperature resistance and corrosion resistance of the ceramic material in molten aluminum to protect the core shaft 2.

[0042] The cooling assembly introduces nitrogen through the gas rotary joint 7 installed on the upper end of the core shaft 2, and transports it to the exhaust hole through the inner cavity of the core shaft 2 for discharge, thereby discharging the heat in the core shaft 2. The discharged nitrogen can remove the hydrogen mixed in the aluminum liquid, and can also form a nitrogen protective layer on the surface of the aluminum liquid to prevent the oxidation of the surface aluminum liquid.

[0043] The embodiment of the utility model has low manufacturing and use costs, can still maintain high strength in a high temperature environment, is resistant to high temperature, corrosion and oxidation, and has a long service life.

[0044] The above shows and describes the basic principles of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only intended to illustrate the principles of the present invention. Without departing from the scope of the present invention, any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional composite connecting rod for a liquid aluminum pump, characterized in that: It comprises a composite connecting rod structure for connecting an impeller (1) inside an aluminum liquid pump, the composite connecting rod structure comprising a core shaft (2) and a protective layer; Wherein, the core shaft (2) is a metal rod, and the lower end of the core shaft (2) is connected to the upper end of the impeller (1); The protective layer comprises an anti-expansion insulation layer (4) and a high-strength composite ceramic refractory layer (3), wherein the anti-expansion insulation layer (4) is coated on the outside of the core shaft (2), and the high-strength composite ceramic refractory layer (3) is cast on the outside of the anti-expansion insulation layer (4), and there is no gap between the anti-expansion insulation layer (4) and the high-strength composite ceramic refractory layer (3) and the impeller (1).

2. The multifunctional composite connecting rod for a molten aluminum pump according to claim 1, characterized in that: The anti-expansion thermal insulation layer (4) is a nanofiber felt thermal insulation layer.

3. The multifunctional composite connecting rod for a molten aluminum pump according to claim 1, characterized in that: A cooling assembly is provided at one end of the core shaft (2) away from the impeller (1).

4. The multifunctional composite connecting rod for a molten aluminum pump according to claim 3, characterized in that: The core shaft (2) has an internal hollow structure, and a plurality of small-diameter exhaust holes communicating with the interior of the core shaft are formed at the lower end of the core shaft (2) connected to the impeller (1), wherein the plurality of small-diameter exhaust holes are located on the same plane and extend to the outer side of the impeller (1); The cooling assembly comprises a connecting seat (5) and a gas rotary joint (7), wherein the connecting seat (5) is fixedly mounted on an upper end of the core shaft (2) away from the impeller (1), the lower end of the gas rotary joint (7) is fixedly mounted on an upper end of the connecting seat (5) away from the core shaft (2), and the upper end of the gas rotary joint (7) is connected to a cooling nitrogen supply pipe, and the gas rotary joint (7) is connected to the interior of the core shaft (2) through a cavity inside the connecting seat (5).

5. The multifunctional composite connecting rod for a molten aluminum pump according to claim 4, characterized in that: A belt pulley (6) is sleeved on the upper end of the connecting seat (5).

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