CS219700B1

CS219700B1 - Steam valve

Info

Publication number: CS219700B1
Application number: CS839281A
Authority: CS
Inventors: Anton Juricek; Miloslav Abel
Original assignee: Anton Juricek; Miloslav Abel
Priority date: 1981-11-16
Filing date: 1981-11-16
Publication date: 1983-03-25

Abstract

U známých napařovacích ventilov ovládacie médium, ktoré pósobí na medzikružie piestu musí , překonávat’ značná silu pružiny, takže pri zvýšení strát vniknutých třením vodiacich elementov sa stává, že sedlový uzávěr sa pod vplyvom tlaku páry samočinné nadvihuje a para samovolné preniká do okolia. Konstrukčně sú známe ventily značné zložité. S cielom zabránenia samočinnému otvoreniu ventilu v případe nedostatočného tlaku pružiny, navrhovaný napařovací ventil má sedlový uzávěr uchytený na dolnom stupni diferenciálneho piesta ovládaného pomocou vratnej pružiny, a vybranie v medzikruží vytvorenom dolným stupňom diferenciálneho piesta a telesom ventilu je kanálom v telese ventilu přepojená s kanálmi v sedle. ' Takýto napařovací ventil je vhodný pre použitie u žehliacich strojov, napařovacích stolov a pod.In known vaporizing valves, the control medium that acts on the piston ring must overcome a considerable force of the spring, so when the frictional losses of the guide elements increase, the seat cap rises under the influence of the pressure of the self-acting steam and the steam spontaneously penetrates into the surroundings. In terms of design, known valves are quite complex. In order to prevent the automatic opening of the valve in the case of insufficient spring pressure, the proposed steam valve has a seat cap attached to the lower stage of the differential piston controlled by a return spring, and the recess in the annulus formed by the lower stage of the differential piston and the valve body is connected by a channel in the valve body to the channels in the seat. ' Such a steaming valve is suitable for use with ironing machines, steaming tables, etc.

Description

Vynález sa týká naparovacieho ventilu použitelného najma u tvaroviek žehliacich strojov a u napařovacích štolo v alebo pod. U doteraz používaných napařovacích ventilov tlaková para pósobí priamo na sedlový uzávěr pridržiavaný k telesu ventilu len silou pružiny, překonáním ktorej sa ventil otvára pre prepustenie páry na žehlený výrobok. Aby nedochádzalo k samočinnému prepúšťaniu páry na výrobok, tlak pružiny na sedlo ventilu musí byť dostatočne velký. Ovládacie médium, ktoré pósobí na medzikružie piestu, musí překonávat’ značnú silu tejto pružiny, takže pri zvýšení strát vzniknutých třením vodiacich elementov sa často stává, že sedlový uzávěr sa pod vplyvom tlaku páry samočinné nadvihuje a para samovolné preniká do okolia. Preto sa u známých ventilov musia klást’ značné nároky na tesniace prvky. Sila potřebná na prekonanie sily pružiny pósobí na medzikružie piesta, a strata sily sa musí nahrádzovať zvýšeným tlakom na jeho ovládanie. Konstrukčně sú známe ventily značné zložité, nakolko sa skladajú z viacerých prvkov a sú náročné na presnosť výroby.BACKGROUND OF THE INVENTION The present invention relates to a vapor valve useful in particular for ironing machines and for vapor depots in or under. In the vapor valves used so far, the pressurized steam acts directly on the seat closure retained to the valve body only by spring force, by which the valve opens to release steam to the ironed article. To prevent the steam from leaking automatically, the spring pressure on the valve seat must be large enough. The control medium acting on the piston ring must overcome the considerable force of the spring, so that when the friction loss is increased, it often happens that the seat closure is automatically raised under the influence of the vapor pressure and the steam spontaneously penetrates into the environment. Therefore, in the case of known valves, considerable demands must be placed on the sealing elements. The force needed to overcome the spring force acts on the piston ring, and the loss of force must be replaced by increased pressure to control it. By design, the known valves are quite complex as they consist of several elements and are demanding on production accuracy.

Uvedené nevýhody znižuje navrhovaný napařovací ventil podía vynálezu. Jeho podstata spočívá v tom, že sedlový uzávěr je uchytený na dolnom stupni diferenciálneho piesta ovládaného vratnou pružinou, a vybranie v medzikruží vytvorenom dolným stupňom diferenciálneho piesta a telesom ventilu je kanálom v telese ventilu přepojené s kanálmi v sedle. Výhodou takéhoto riešenia je, že pri jeho použití nemóže dojsť k samočinnému otvoreniu ventilu v případe nedostatočného tlaku pružiny, pretože táto má iba pomočnú funkciu pasivného prekonania odporov vodiacich prvkov, ked sa sedlový uzávěr dostane do uzatváracej polohy pod tlakom páry. Přitom ovládacie médium pósobí na celú plochu piestu, takže ovládací tlak média móže byť menší. Tým je ventil v žehliacich prevádzkach aj pri určitom poklese tlaku funkcie schopný.The aforementioned disadvantages are reduced by the proposed vapor valve according to the invention. It is based on the fact that the seat closure is attached to the lower stage of the differential piston actuated by the return spring, and the recess in the annulus formed by the lower differential piston stage and the valve body is channeled through the valve body to the channels in the seat. The advantage of such a solution is that when it is used, the valve cannot be opened automatically in the case of insufficient spring pressure, since it only has an auxiliary function to passively overcome the resistance of the guide elements when the seat closure reaches the closing position under steam pressure. In doing so, the control medium acts on the entire surface of the piston, so that the control pressure of the medium can be smaller. In this way, the valve is able to function in the ironing operations even with a certain pressure drop.

Napařovací ventil podlá vynálezu možno ovládat’The steam valve according to the invention can be operated

Claims

Steam valve for ironing machines, steaming tables and the like, with pneumatic or manual control, using a return spring and differential piston, characterized in that the seat closure (7) is attached to the lower stage of the differential219700 using both pressure medium and manual , for example using a lever system.

An exemplary embodiment of a vapor valve is shown schematically in the accompanying drawing, which represents the seat and valve body in longitudinal section with the seat closure in the closed position. The valve shown assumes control by pressure medium.

The valve body 3 is screwed in the seat 1 fitted into the pressure chamber 2. In the seat 1 there are formed supply channels 4 connecting the pressure chamber 2 s. In the valve body 3, a recess 8 is formed in which the differential piston 9 is received. In the middle stage of the differential piston 9, a recess spring 10 is supported in the recess 8, resting one end against the upper stage of the differential piston 9; In the vapor pressure chamber 5, a seat closure 7 is attached to the differential piston 9, which in the closed position abuts the valve seat 3. In the upper part of the valve, a cover 11 is screwed into the body 3, with an opening for operating the differential piston 9 by the pressure medium. Further, an adjustable stop 12 for adjusting the stroke of the differential piston 9 is screwed into the valve body 3. In the annular ring formed by the lower stage of the differential piston 9 and the valve body 3, the recess 8 forms a channel for steam removal through the channel 13 in the valve body 3 and channels 14 in the seat 1.

The steam from the pressure chamber 2 passes through the inlet ducts 4 to the pressure space 5 in the seat 1. Steaming occurs when, after supplying the pressure medium through the opening of the lid 11, this medium acts on the face of the differential piston 9, overcoming the spring force 10 and the differential piston 9 As a result, the seat closure 7 at the lower stage of the differential piston 9 is separated from the valve body 3 and the pressure vapor expands through the recess 8, the channel 13 in the valve body 3 and the channels 14 in the seat 1 onto the ironed article.

BACKGROUND OF THE INVENTION The piston (9) actuated by the return spring (10), and the recess (8) in the ring ring formed by the lower stage of the differential piston (9) and the valve body (3) is a channel (13) in the valve body (3) in communication with the channels (14). ) in the saddle (1).