A kind of non-metal valve core and its molding process
A molding process, non-metallic technology, applied in valve devices, engine components, mechanical equipment, etc., can solve the problems of poor reliability, poor sealing performance, and reduced sealing performance, and achieve the effect of high reliability and good sealing performance
Active Publication Date: 2017-07-07
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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Problems solved by technology
[0002] Among the valve structures in the prior art, the valves that can withstand low temperature to high temperature are mainly all-metal spool structure, and its medium resistance performance can be selected according to the properties of metal materials, but the sealing specific pressure of the all-metal spool is very large, and it is difficult to operate at low pressure. The lower sealing performance is poor. If the valve caliber is larger, the sealing performance will be worse, and due to the metal-to-metal seal, it is easy to wear and drop slag, which is redundant for the launch vehicle and will cause the rocket to malfunction.
The valve core with rubber as the sealing surface will be vitrified due to low temperature and cannot be used; the valve core with polytetrafluoroethylene as the sealing surface can only be cold-bonded to the metal and then rolled to seal the valve core to ensure reliability. Poor, its diPTFE has greater cold flow, which will lead to a decrease in sealing performance after long-term use
If the valve core is made of engineering plastics such as polyimide, it may not be used due to the compatibility of pure oxygen
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[0025] Such as figure 1 As shown, a non-metallic valve core includes a valve head and a valve stem with a guiding function. The valve head and the valve stem are a metal skeleton with an aluminum material structure. A dovetail groove is arranged in the middle of the bottom surface of the valve head, and the angle between the grooves is 20. -25 degrees, the width of the groove opening is 4-5mm, and the depth is 2-3mm, and the melted plastic polyperfluoroethylene propylene is arranged in it.
[0026] Such as Figure 6 As shown, a non-metallic spool molding process, the specific steps are:
[0027] (1) cleaning the metal skeleton according to claim 1 with gasoline and absolute ethanol to remove surface impurities;
[0028] (2) Sand blowing: use 20-24 mesh quartz sand or brown corundum sand to blow sand on the bottom surface of the valve head and the dovetail groove, the pressure of the compressed air flow is 0.4-0.7MPa, and polish the burrs on the metal surface after sand blowi...
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The invention discloses a non-metal valve core. The non-metal valve core comprises a valve head and a valve rod with a guide function, wherein the valve head and the valve rod are a metal framework in an integral aluminum structure; a dovetail groove is arranged in the middle part of the bottom face of the valve head; an included angle of the groove is 20-25 degrees; a groove opening is 4-5mm in width and 2-3mm in depth; melted plastic tetrafluoroethylene-hexafluoropropylene copolymer is arranged inside the groove opening. According to the non-metal valve core, a thermo-compression molding process is used between the plastic and the metal framework, so that the adhesive property of the plastic and metal can be ensured; the adhesive intensity is up to 17MPa or above; the adhesive intensity under 500K is more than 3.5MPa; the reliability is high.
Description
technical field [0001] The invention relates to a non-metallic valve core and a molding process thereof, belonging to the technical field of valve sealing. Background technique [0002] Among the valve structures in the prior art, the valves that can withstand low temperature to high temperature are mainly all-metal spool structure, and its medium resistance performance can be selected according to the properties of metal materials, but the sealing specific pressure of the all-metal spool is very large, and it is difficult to operate at low pressure. The lower sealing performance is poor. If the valve caliber is larger, the sealing performance is even worse, and due to the metal-to-metal seal, it is easy to wear and drop slag, which is redundant for the launch vehicle and will cause the rocket to malfunction. The valve core with rubber as the sealing surface will be vitrified due to low temperature and cannot be used; the valve core with polytetrafluoroethylene as the sealin...
Claims
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IPC IPC(8): B29C65/02
CPCB29C65/02F16K51/00
Inventor 朱军刘凤英王帮武赵建设伍芃
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH