CS258676B1

CS258676B1 - Hydraulic switching valve

Info

Publication number: CS258676B1
Application number: CS867461A
Authority: CS
Inventors: Rudolf Balasko
Original assignee: Rudolf Balasko
Priority date: 1986-10-15
Filing date: 1986-10-15
Publication date: 1988-09-16
Also published as: CS746186A1

Description

Vynález rieši. hydraulický spínací ventil, ktorý v hydraulickom okruhu pri poklese tlaku, ktorú sposohí porucha zdroja tlaku, alebo. vedenia tlaku v okruhu, zabezpečuje vyslanie poruchového signálu.The invention solves. a hydraulic shut-off valve which in the hydraulic circuit upon a pressure drop caused by a pressure source failure; or. pressure circuit in the circuit, provides a fault signal.

Doteraz známe hydraulické tlakové relé sú piestikovej konštrukcie, kde sa pohyb reakčného piestika prenáša mechanicky na palec mikrospínače a v závislosti na tlaku spina, alebo rozepíná elektrický obvod. Tlakové relé je poměrně zložitej a drahej konštrukcie a jeho použitie v hydraulickom obvode, kde má signalizovat pokles tlaku vysláním poruchových signálov je neúčelné.The prior art hydraulic pressure relays are of a piston design, where the movement of the reaction piston is mechanically transmitted to the thumb of the microswitch and, depending on the pressure, a switch, or opens the electrical circuit. The pressure relay is a relatively complex and expensive design, and its use in a hydraulic circuit to signal a pressure drop by sending fault signals is ineffective.

Nevýhody doteraz známých hydraulických tlakových relé, alebo snímačov tlaku oleja, ktoré sa možu použiť len pre nízké tlaky, odstraňuje hydraulický spínací ventil piestikovej konštrukcie pódia vynálezu, ktorého podstata spočívá v tom, že v telese ventila sú axiálně za sebou usporiadané dva navzájdm přepojené válcové otvory, v ktorých sú axiálně za sebou uložené primárný piestik těsněný prvým O-krúžkom, primárná pružina, opřená o nastavovacie podložky a sekundárný piestik těsněný druhým 0-krúžkom, sekundárná pružina opřená o· zátku a poistnú podložku, pričom v telese ventilu je medzi primárným a sekundárným piestikom radiálně vytvořený jeden otvor s vnútorným závitom pre snímač tlaku oleja a v priestore medzi primárným a reakčným piestikom je jeden otvor pre beztlaký odpad netěsnosti. Z čelnej strany je do telesa ventilu axiálně zaskrutkované hrdlo s reakčným piestikom těsněným manžetou a zakončeným sed lom, ktoré sa opiera z čelnej strany o primárný piestik,The disadvantages of the prior art hydraulic pressure relays or oil pressure sensors, which can only be used for low pressures, are eliminated by the hydraulic switching valve of the piston structure of the invention, which consists in the fact that two mutually interconnected cylindrical openings are arranged in the valve body. in which the first O-ring sealed primary piston, the primary spring supported on the adjusting washers and the second O-ring sealed secondary piston, the secondary spring supported by the stopper and the lock washer are axially disposed, wherein the valve body is between the primary and the secondary piston has a radially formed one internally threaded bore for the oil pressure sensor, and there is one bore for pressureless leakage waste in the space between the primary and reaction pistons. From the front side, a throat with a reaction piston sealed by a collar and a seated end is axially screwed into the valve body and is supported from the front side by the primary piston,

Hydraulický spínací ventil podlá vynálezu je jednoduchej, nenáročnej konštrukcie a spolahlivé j funkcie. Je možné zapéjať ho do okruhov s nízkým, alebo s vysokým tlakom a rozsah spínaných poklesov tlaku je možné nastavovat.The hydraulic switch valve according to the invention is of simple, unpretentious construction and reliable functions. It can be wired into low or high pressure circuits and the range of switched pressure drops can be adjusted.

Příklad prevedenia hydraulického spínacieho ventilu pódia vynálezu je zobrazený na výkrese, kde je znázorněný osový pozdížny rez ventilom.An example of an embodiment of a hydraulic switching valve according to the invention is shown in the drawing where an axial longitudinal section through the valve is shown.

V telese 1 ventilu sú axiálně za. sebou dva válcové otvory navzájom přepojené menším otvorom, v ktorých sú axiálně za sebou uložené primárný piestik 2 těsněný prvým 0-krúžkóm a pritláčaný primárnou pružinou 3 opierajúcou sa o nastavovacie podložky 4, dalej v druhej diere sú sekundárný piestik 5 těsněný druhým O-krúžkom 9 a pritláčaný sekundárnou pružinou 6 opierajúcou sa o zátku 7 a poistnú podložku 10.They are axially behind the valve body 1. two cylindrical bores interconnected by a smaller bore, in which a primary piston 2 sealed by a first O-ring and pressed by a primary spring 3 resting on the adjusting washers 4 is placed axially one after another, and in the second hole the secondary piston 5 is sealed by a second O-ring 9 and pressed by a secondary spring 6 supported by the plug 7 and the lock washer 10.

V telese 1 ventilu je medzi primárným piestikom 2 a sekundárným piestikom 5 ra258676 diálne jeden otvor s vnútorným závitom pre snímač 8 tlaku oleja a z čelnej strany je do telesa 1 ventilu v ose zaskrutkované hrdlo 13 s reakčným piestikom 12 těsněným manžetou 11 a zakončený sedlom X, ktorý sa z čelnej strany opiera o primárný piestik 2.In the valve body 1, there is one internally threaded bore for the oil pressure sensor 8 between the primary piston 2 and the secondary piston 5 ra258676, and a throat 13 with a reaction piston 12 sealed by a collar 11 and ending with a seat X is screwed into the valve body 1. which rests on the front side on the primary piston 2.

V priestore medzi primárným piestikom 2 a reakčným piestikom 12 je v telese 1 ventilu jeden otvor Y pre beztlaký odpad netěsnosti, ktorý je potřebné zapojit' pri vysokých tlakoch.In the space between the primary piston 2 and the reaction piston 12, in the valve body 1 there is one opening Y for pressureless leakage waste which has to be connected at high pressures.

Potřebný spínací tlak ventilu zaisťuje primárná pružina 3 a nastavovacie podložky 4. Sekundárná pružina 6 zaisťuje vznik a udržanie tlaku potřebného nta rozopnutie kontaktov snímača 8 tlaku oleja a zároveň chráni snímač 8 tlaku oleja před poškodením vyšším tlakom, než je dovolený pracovný tlak snímača 8.The required spring pressure of the valve is provided by the primary spring 3 and the adjusting washers 4. The secondary spring 6 ensures the formation and maintenance of the pressure required to open the oil pressure sensor contacts 8 while protecting the oil pressure sensor 8 from damage above the permissible working pressure.

Funkcia spínacieho ventilu je nasledovná:The function of the switch valve is as follows:

Pri zapojení spínacieho ventilu do okruhu s pracovným tlakom p nad hodnotou spínacieho tlaku ventilu pi sa dá do pohybu reakčný piestik 12, ktorý tlačí na primárný piestik 2 a tým stúpne tlak p2 v priestore medzi piestikmi 2, 5 na tlak potřebný na rozopnutie kontaktov snímača 8 tlaku oleja, ktorý zruší vysielanie poruchového signálu. Po dosiahnutí rozpínacieho tlaku snímača 8, ktorý zaisťuje sekundárná pružina 6 sa dá do pohybu aj sekundárný piestik 5, tým sa medzi piestikmi 2, 5 udržuje konštantný rozpínací tlak p2, sekundárný piestik 5 plní zároveň aj funkciu spožďovača, pretože pri krátokodobom poklese tlaku p < pi sa piestiky 2, 5 začnú vracať do východzej polohy, ale sekundárná pružina 6 udržiava medzi piestikmi 2, 5 i naďalej potřebný tlak p2 na rozopnutie snímača 8 tlaku/oleja.When the switching valve is connected to a circuit with an operating pressure p above the switching pressure of the valve pi, the reaction piston 12 is actuated, pushing the primary piston 2 and thereby increasing the pressure p2 in the space between the pistons 2, 5 to the pressure necessary to open the contacts of the sensor 8 oil pressure, which cancels the transmission of a fault signal. When the expansion pressure of the sensor 8 provided by the secondary spring 6 has been reached, the secondary piston 5 can also be moved, thereby maintaining a constant expansion pressure p2 between the pistons 2,5, the secondary piston 5 also fulfilling the delay function. As the pistons 2, 5 begin to return to the starting position, the secondary spring 6 maintains the required pressure p2 between the pistons 2, 5 to open the pressure / oil sensor 8.

Pri pracovnom tlaku p s hodnotou nad nastavenou hodnotou spínacieho tlaku pi reakčný piestik 12 so sedlovou stykovou plochou X uzavrie priestor medzi piestikmi 2, 5 a presaky vysokého tlaků sú odvádzané kanálikom Y do beztlakého odpadu. Pri poklese pracovného tlaku p na p < pi sa reakčný piestik 12, piestiky 2, 5 vrátia do· východzej polohy. Tým sa rozpínací tlak p2 medzi piestikmi 2, 5 zruší a snímač 8 tlakuoleja zopne elektrický okruh svetelnej, zvukovej signalizácie, alebo okruh havarijnej brzdy.At an operating pressure p with a value above the set switching pressure pi, the reaction piston 12 with the saddle contact surface X closes the space between the pistons 2, 5 and the high-pressure leakages are discharged through the channel Y into the pressureless waste. When the working pressure p drops to p <pi, the reaction piston 12, the pistons 2, 5 return to the initial position. As a result, the expansion pressure p2 between the pistons 2, 5 is canceled and the pressure sensor 8 switches the electrical light, audible signal, or emergency brake circuit.

Hydraulický spínací ventil podlá vynálezu je možné využit pri konštrukcii stavebných a čestných strojov majúcich hydraulické servoriadenie, v hydraulických a pneumatických lisoch, v obráběcích strojoch a v iných hydraulických zariadeniach, kde pri poklese tlaku v pracovnom okruhu sposóbenom poruchou zdroja tlaku, deštrukciou hadice a vedenia je potřebné poruchu signalizovat, alebo chránit zariadenie a obsluhu před poškodením.The hydraulic switch valve according to the invention can be used in the construction of construction and honest machines having hydraulic power steering, in hydraulic and pneumatic presses, machine tools and other hydraulic devices where pressure drop in the working circuit caused by pressure source failure, hose and line destruction is required. to signal the fault or to protect the device and the operator from damage.

Claims

258676 one orifice with internal threaded oil pressure transducer 8 and from the front side the valve valve 1 is screwed in the neck 13 with the reaction piston 12 with a sealed sleeve 11 and terminated with a saddle X which rests on the primary piston from the front

2. In the space between the primary piston 2 and the reaction piston 12, there is one opening Y in the valve body 1 for non-pressurized non-leakage waste, which needs to be connected at high pressures. The necessary switching pressure of the valve is ensured by the primary spring 3 and the adjusting washers 4. The secondary spring 6 ensures the formation and maintenance of the pressure required to open the contacts of the oil pressure sensor 8 and at the same time protect the oil pressure sensor 8 from damage to a higher pressure than permissible working pressure of the sensor 8. The function of the switching valve is as follows: When the switching valve is connected to the circuit with a working pressure p above the switching pressure of the valve pi, a re-action piston 12 is pushed which presses on the primary piston 2 and thus increases the pressure p2 in the space shift the pistons 2, 5 to the pressure required to switch the taps of the oil pressure sensor 8 to cancel the transmission of the fault signal. Upon reaching the expansion pressure of the sensor 8, which secures the secondary spring 6, the secondary piston 5 also starts to move, thereby maintaining a constant expansion pressure p2 between the pistons 2, 5, while the secondary sand 5 also serves as a retarder, since the piston 2, 5 begins to return to the starting position, but the secondary spring 6 continues to maintain the necessary pressure p2 between the pistons 2, 5 to open the oil pressure sensor 8. At a working pressure p with a value above the set pressure of the switching pressure pi, the piston 12 with the saddle contact surface X closes the space between the pistons 2,5 and the high pressure leaks are discharged through the channel Y into the pressureless waste. When the working pressure p decreases, the piston 12, pistons 2, 5 are returned to the starting position. Thereby, the expansion pressure between the pistons 2, 5 is canceled and the pressure sensor 8 switches the electric circuit of the light, audible signal or emergency brake circuit. The hydraulic switching valve according to the invention can be used in the construction of construction and honorary machines having hydraulic servo control, in hydraulic and pneumatic presses, in machine tools and in other hydraulic devices, where the pressure drop in the working circuit is compromised the source of pressure, destruction of the hoses and lines, it is necessary to signal the malfunction or to protect the equipment and the operator from damage. SUBJECT Hydraulic switching valve of the piston structure, characterized in that it consists of a valve body (1) in which two cylindrical openings connected to one another are arranged axially, in which the primary piston [2] is sealed by a first O-ring. , primary spring (3) resting on adjusting pads (4) and plunger plunger (5) sealed with second ring 0 (9), secondary spring (6) resting on plug (7) and lock washer (10) in the valve body (1) there is one internally threaded opening for the oil pressure sensor (8) and the space in front of the primary piston (2) being radially formed between the primary piston (2) and the secondary piston (5) one opening (Y) for non-pressure non-leakage waste and from the front side the neck (13) is screwed axially to the valve body (1) with a sealing piston (12) sealed with a sleeve (11) and ending with a saddle (X) relies on prim reverse to the plunger (2). 1 sheet of drawings