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Pressure regulating valve for packaging design and calculation of mathematical models


Process requirements under the automatic valve, the minimum acceptable maximum flow ‰: 0.12 【-) where: 【shape size containers; rm the volume of packaging container itself. Fork: population of a 0 · r to (12), (13) into (10),[link widoczny dla zalogowanych], (1】) was r, I: Home - loading mechanism for the rejection of the preload on the spool. Spool in the open process, both sides of the balance of force at any time, so now (22), (23) into (21), arranged, Pp. 8 = + delete and delete F'24 rising little effect on the balance equation, can be neglected, from (24) have simplified the actual state of the spool by the force balance equation of a corpse ISLAND (25) (23) into (25 ), may (12) day dead one by one (x +) (26) on the type (26) is the design of the required size of the valve structure of the force balance equation Yan core design constraints fixed for the police & · · n · √ · hit [(Lu (Lu)] (14) to compete. where n · (South √ H South) where the flow coefficient is determined by the flow test. on the same structural dimensions of the valve flow test, for group ( generally the group 3) soul, according to the formula: port / port _ (16): 0.9XΣ Fu (I7) J-L where: V - valve port} port --- the amount of actual glistening valve port means the theoretical flow , according to equation (14) or (15) calculated (14). (】 5) & a tired '(1 where: D - diameter of the spool side; X valve opening height, the spool stroke Eq (1 into (t5),[link widoczny dla zalogowanych], (14),[link widoczny dla zalogowanych], finishing a T a 224 ·。·,[link widoczny dla zalogowanych]。· Quebec T-√ [(Lu) a (lu] (19) r-_Jc - Lm: 7. 5'C'D 'set' t '√ win (20-type (19), (20) is the design of automatic valve required valve port flow equation. 2. spool core by the force balance equation of Yan in the open, up the process, A, B are subject to forces on both sides. in the side force F suffered a P.8 + (211 where n total pressure suffered side} n ~ atmosphere inside the container an effective role in the spool area; ~ valve port gas flow generated by steady-state aerodynamic axial pitch. the other side of the spool side suffered Force B n: + · · r deletion (22) r-d (Venturi + ') (23 ) where - B-side total pressure suffered {n - loading mechanism on the spool force; s - the role of the container outside air the effective area of ​​the spool; m - spool Quality} - loading mechanism stiffness} B one (curse) 0. (27) Island, a () (2 where: D + side of the core diameter} Yan Island - B side of the valve effective area by air pressure. In order to improve the flow after opening rate, shorten the journey I open the Arab core, the sensitivity of the start, in theory,[link widoczny dla zalogowanych], hope-l, the D-D + Ⅳ. that is designed orifice structure size should be sealed in ensuring the closure of Kai premise, m 10 and as much as possible mouth by the pressure of the metal and nonmetal static seal theory available, in determining the valve opening pressure of a set /, should meet, + P <Corpse l ≤ (2 where: a sealed packaging container itself is the mouth pressure; - a The structural strength of containers; May - only to meet the maximum height of the valve opening (29), we can guarantee to maintain the minimum amount of valve leakage, without affecting the reliability of protective containers. performance tests designed to establish the pressure regulating valve of Computational Mathematics model, is not likely to fully simulate the actual state of Yan. To compensate for differences between theoretical and practical, the need for pressure regulating valve for the experimental verification in order to finalize the structural parameters of the various parts of the valve. performance test mainly includes body strength test Yan Yan Block core and sealing performance test and performance test Yan garlic opening and closing movements. Conclusion 1, l-lock packaging ridicule by the rapid discharge or warm air into, to balance the rigid sealed containers inside and outside atmospheric pressure, reducing the pressure difference and pressure gradient on the vessel damage. The control valve can play a role in the protection, the key is whether the valve opening and closing operating characteristic curve, as shown in Figure 2.2. In this paper, the jet nozzle gas dynamics theory and the theory as a tool seals describes the packing pressure regulating valve port with the actual flow characteristics of the gas, and the establishment of the spool valve port flow equation and the force balance equation. At the same time gives the two constraints; the four relationships expressed packaging pressure control valve Design calculation model. 3 The mathematical model derived pressure regulating valve Theoretical calculation and the actual differences are considerable, the performance of the valve test is a necessary correction model approach. China Packaging 1993, Volume 3 of / 69 ■

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