A New Type of Twisted Sheet Tube Investment Mold

Abstract

A novel twisted slice tube investment pattern comprises a pouring cup and a twisted slice tube. A transverse pouring gate is formed in the lower side of the pouring cup, rotary pouring gates are formed in two sides of the lower side of the transverse pouring gate and are connected with the twisted slice tube through a plurality of sprues, and the sprues are horizontally symmetric. The novel twisted slice tube investment pattern is reasonable in structure, the occurrence probability of liquid steel impurities is reduced, the rotation directions of the rotary pouring gates are the same as that of twisted blades in the twisted slice tube, partial shrinkage porosity of the twisted blades of the twisted slice tube is avoided, the service life of the twisted slice tube is prolonged, meanwhile, the qualified rate of radiography testing of the twisted slice tube is increased to 98% from 20% before, the waste of labor is avoided and the production cost is reduced.

Description

technical field

[0001] The invention relates to the application in cracking furnaces, in particular to a novel twisted sheet tube investment mold. Background technique

[0002] The application of twisted sheet tubes in cracking furnaces is a major technological breakthrough in the development of the ethylene industry. The twisted sheet tube is the core of cracking furnace enhanced heat transfer technology. After the cracking furnace is equipped with twisted sheet tubes, when the fluid passes through the twisted sheet tubes with the same width as the furnace tube, the original piston flow changes into a swirling flow, which greatly increases the tangential flow velocity of the fluid and forms a strong scouring effect on the tube wall , greatly reducing the thickness of the boundary layer with high thermal resistance, increasing the total heat transfer coefficient of the furnace tube, thereby reducing the temperature of the furnace tube wall, achieving enhanced heat transfer ...

Examples

Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] Referring to the accompanying drawings, a new twisted sheet tube investment mold includes a sprue cup 1 and a twisted sheet tube 5. It is characterized in that: a runner 2 is arranged under the sprue cup 1, and the two sides of the lower end of the runner 2 The rotary runner 3 is symmetrically arranged, and the rotary runner 3 is connected to the twisted sheet tube 5 through several gates 4; The directions are consistent; the gates 4 are arranged symmetrically.

[0013] During concrete implementation, molten steel is injected into the runner from the top sprue cup 1 during pouring, enters the rotary runner 3 from the runner 2, and is injected into the cavity of the twisted sheet tube 5 by several inlets 4 respectively. Compared with a new type of traditional twisted sheet tube investment mold, the present invention has the following advantages: 1. The flow mode of m...

technical field

[0001] The invention relates to the application in cracking furnaces, in particular to a novel twisted sheet tube investment mold. Background technique

[0002] The application of twisted sheet tubes in cracking furnaces is a major technological breakthrough in the development of the ethylene industry. The twisted sheet tube is the core of cracking furnace enhanced heat transfer technology. After the cracking furnace is equipped with twisted sheet tubes, when the fluid passes through the twisted sheet tubes with the same width as the furnace tube, the original piston flow changes into a swirling flow, which greatly increases the tangential flow velocity of the fluid and forms a strong scouring effect on the tube wall , greatly reducing the thickness of the boundary layer with high thermal resistance, increasing the total heat transfer coefficient of the furnace tube, thereby reducing the temperature of the furnace tube wall, achieving enhanced heat transfer ...

Examples

Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] Referring to the accompanying drawings, a new twisted sheet tube investment mold includes a sprue cup 1 and a twisted sheet tube 5. It is characterized in that: a runner 2 is arranged under the sprue cup 1, and the two sides of the lower end of the runner 2 The rotary runner 3 is symmetrically arranged, and the rotary runner 3 is connected to the twisted sheet tube 5 through several gates 4; The directions are consistent; the gates 4 are arranged symmetrically.

[0013] During concrete implementation, molten steel is injected into the runner from the top sprue cup 1 during pouring, enters the rotary runner 3 from the runner 2, and is injected into the cavity of the twisted sheet tube 5 by several inlets 4 respectively. Compared with a new type of traditional twisted sheet tube investment mold, the present invention has the following advantages: 1. The flow mode of m...

Images