CN100484743C - Frother mixing head - Google Patents

Abstract

The invention relates to a foaming foaming machine mainly used for the continuous foaming production of various resin foams, especially suitable for the continuous foaming of high-viscosity resins such as phenolic resin and other multi-component fluid stirring and foaming production that require high-speed stirring. Bubble machine mixing head. It is equipped with a motor, an impeller, a material mixing chamber and at least one feeding pipe, the impeller shaft is connected with the motor, the impeller is placed in the material mixing chamber, the feeding pipe and the material mixing chamber are connected by an axial feed port, and the material mixing chamber The front end is provided with a mixing nozzle. Compared with the existing equipment, the method of feeding material along the axial feed port is skillfully adopted, which avoids the high pressure around the swirling flow field and overcomes the existing disadvantages. The head of the impeller is equipped with a spiral propulsion section, which helps the material to enter the mixing chamber and further avoids the problem of material backflow. The structure of direct connection between the motor and the impeller is adopted, without a speed-increasing mechanism, which simplifies the mechanical transmission structure and improves the transmission efficiency. It is easy to achieve high speed, thus greatly improving product quality.

Description

Foaming machine mixing head

technical field

The invention relates to a plastic pressure foam molding equipment, which is mainly used for the continuous foaming production of various resin foams, especially for the continuous foaming of high-viscosity resins such as phenolic resins and other multi-component products that require high-speed stirring. Foaming machine mixing head for fluid mixing and foaming production.

Background technique

Phenolic foam material is a new type of flame-retardant foam insulation material. Due to the difference in raw material viscosity, its production equipment is very different from the current mature polyurethane foam equipment. At present, many manufacturers have changed the main parts of the original polyurethane continuous foaming equipment to anti-corrosion materials for the production of phenolic foam materials. Due to the high viscosity and high density of phenolic resin, it often occurs Problems such as blockage of the feed port, backflow of resin raw materials and mixtures to other material pipelines, etc., actually cannot achieve normal continuous production. In addition, the higher the speed of the impeller of the mixing head, the better the product quality. The existing equipment often adopts belt or gear speed increase, which has problems such as bulky size and low efficiency, and the maximum speed that can be achieved is very limited. CN 1345656 patent discloses a phenolic resin low-temperature foaming machine, which consists of three sets of storage tanks, metering pumps, metering gear pumps, mixing heads with motors, solenoid valves, discharge valves, feeding pipes and return pipes and so on. Among them, the mixing head is composed of a mixing chamber, a rotor driven by a motor in the mixing chamber and a vortex blade on it. The mixing head is made of OOCr17Ni14Mo2 material, and the rotor and vortex blade are made of OCr17Ni13Mo5 material.

Contents of the invention

The present invention aims to overcome the problems existing in the above-mentioned existing continuous foaming equipment, and provides a continuous foaming production mainly used for various resin foams, especially suitable for continuous foaming of high-viscosity resins such as phenolic resins, and other equipment that require high speed. Foamer mixing head for agitated, multi-component fluid agitation and foaming production.

The invention is provided with a motor, an impeller, a material mixing chamber and at least one feeding pipe, the impeller shaft is connected with the motor, the impeller is placed in the material mixing chamber, the feeding pipe and the material mixing chamber are connected by an axial feeding port, and the materials are mixed The front end of the cavity is provided with a mixing nozzle (or extrusion nozzle).

The impeller shaft can be connected with the motor by a coupling. The impeller used for material stirring and mixing is preferably provided with two functional sections, a propulsion section and a mixing section. The propulsion section can be in a spiral structure; the mixing section can adopt a blade-type structure. In addition to the axial feed port, a radial feed port can also be set on the material mixing chamber.

Compared with the existing equipment capable of continuous production of phenolic foam, the mixing heads of the existing resin foaming machines all use radial feed ports. The high pressure in the periphery will easily cause the mixture to pour back into the feed port of the material with lower density and viscosity, and the materials of different components will mix, solidify, and block in the pipeline near the feed port. The present invention skillfully adopts the method of feeding material along the axial feeding port, avoids the high pressure on the periphery of the rotating flow field, and overcomes the existing disadvantages.

The existing impeller of the mixing head of the resin foaming machine has no clear and independent propulsion function section, and the pressure distribution along the axial direction of the entire mixing chamber has no reasonable gradient. The high pressure generated when the materials are mixed and foamed, on the one hand, the mixture is ejected from the extrusion nozzle, and on the other hand, the mixture is invaded near the material inlet with lower density and viscosity. In the present invention, a screw propulsion section is designed at the head of the mixing impeller. Under the high speed of thousands of revolutions per minute, the end of the propulsion section near the feed inlet generates low pressure or even negative pressure, which helps the material to enter the mixing chamber and further The problem of material backflow is avoided.

The mixing head of the existing resin foaming machine is driven by a motor through a speed increasing mechanism to obtain the high speed required for high-quality mixing. The invention adopts the structure in which the motor and the impeller are directly connected without passing through a speed-increasing mechanism, simplifies the mechanical transmission structure, and improves the transmission efficiency. It is easy to achieve high speed, thus greatly improving product quality. High speed can be obtained by general frequency conversion technology.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

Example 1

As shown in Figures 1 and 2, the present invention is provided with a motor 1, a shaft coupling 2, an impeller shaft 3, an impeller 4, three axial feed pipes 5, a material mixing chamber 6 and a nozzle 7, and the impeller shaft 3 passes through the shaft coupling The device 2 is connected with the motor 1, the impeller 4 is placed in the material mixing chamber 6, the axial feeding pipe 5 and the material mixing chamber 6 are connected by an axial feeding port, and the front end of the material mixing chamber 6 is connected with the mixing nozzle 7. The impeller 4 is divided into two functional sections: a helical propelling section 4.1 and a blade mixing section 4.2.

Example 2

Similar to Embodiment 1, the difference is that a radial feed pipe can be provided, and the radial feed pipe is connected to the material mixing chamber through a radial feed port.

A motor with a speed of 3600 r/min or more can be used, and the structure directly connected with the impeller shaft is adopted without passing through the speed increasing mechanism.

Referring to Figures 1 and 2, a variety of liquid materials enter the mixing chamber 6 from three axial feed pipes 5 through the axial feed port. Due to the high-speed rotation of the impeller screw propulsion section 4.1, the negative pressure near the feed inlet is caused, so that the material enters the mixing chamber smoothly. If the viscosity and density of the main material are particularly high, the radial feeding pipe located in the mixing section can directly enter the mixing chamber through the radial feeding port, while the low-density material still enters the mixing chamber through the axial feeding pipe 5. At this time, the screw propulsion section 4.1 acts as a rotary seal, which can effectively prevent the phenomenon of material backflow. After the material is mixed by the high-speed rotating impeller mixing section 4.2, it is output by the nozzle 7.

Obviously, the present invention can be used in the continuous foaming production of various resin foams, especially suitable for the continuous foaming process of high-viscosity resins such as phenolic resin, and also suitable for other multi-component fluid stirring and foaming processes that require high-speed stirring .

Claims (3)

1. The mixing head of the foaming machine is characterized in that it is equipped with a motor, an impeller, a material mixing chamber and at least one feeding pipe. The impeller shaft for material mixing is connected with the motor by a coupling, and the impeller is placed in the material mixing chamber. Inside, the impeller is provided with two functional sections, the propulsion section and the mixing section. The impeller propulsion section has a spiral structure, the feed pipe and the material mixing chamber are connected by an axial feed port, and the front end of the material mixing chamber is provided with a mixing nozzle. 2. The mixing head of the foaming machine according to claim 1, characterized in that the mixing section of the impeller adopts a blade structure. 3. The mixing head of the foaming machine according to claim 1, characterized in that a radial feeding port is arranged on the material mixing chamber.

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