SU987224A1

SU987224A1 - Pneumatic intensifier

Info

Publication number: SU987224A1
Application number: SU813321301A
Authority: SU
Inventors: Георгий Семенович Бакрымов; Виктор Трофимович Лысаковский
Priority date: 1981-07-23
Filing date: 1981-07-23
Publication date: 1983-01-07

Description

(54) ПНЕВМАТИЧЕСКИЙ УСИЛИТЕЛЬ(54) PNEUMATIC AMPLIFIER

Изобретение относитс к приборостроению , а именно к пневматическим аналоговым элементам.The invention relates to instrumentation, namely to pneumatic analog elements.

Известно устройство, содержащее двухмембранный блок, дроссель и подвижное сопло. Это устройство позвол ет умножить входной сигнал на посто нный положительный коэффициент 1 .A device containing a double membrane unit, a choke and a movable nozzle is known. This device allows you to multiply the input signal by a constant positive factor of 1.

Недостаток этого устройства - отсутствие усилени по мощности входного сигнала.The disadvantage of this device is the lack of gain in input power.

Наиболее близким к предлагаемому по технической сущности вл етс усилитель, содержащий мембранный блок, ):амеры: входную, отрицательной обратной св зи и две проточные, соединенные с клапанами питани и сброса, выполненные с общей заслонкой и двум концентричными седлами,, одним из которых вл етс торец штока мембранного блока, в котором выполнен осевой канал, подключенный к проточной камере клапана сброса, а второе седло жестко соединено с корпусом 2 .The closest to the proposed technical entity is an amplifier containing a membrane unit,): amers: input, negative feedback and two flow-through, connected to the power and reset valves, made with a common damper and two concentric seats, one of which is The end of the stem of the membrane unit, in which an axial channel is made, is connected to the flow chamber of the relief valve, and the second seat is rigidly connected to the housing 2.

Г1елостатком известного усилител вл етс невозможность изменени коэффициента усилени , что не позвол ет примен ть известное устройство.The core of a known amplifier is the inability to change the gain, which prevents the use of a known device.

например, в пневматических след щих приводах, где с целью устойчивой работы привода необходимо измен ть коэффициент усилени в зависимости от динамических характеристик объекта .For example, in pneumatic servo drives, where for the purpose of stable drive operation it is necessary to change the gain depending on the dynamic characteristics of the object.

Целью изобретени вл етс рас- ширение области применени усилите10 л .The aim of the invention is to expand the field of application of amplifiers.

Эта цель достигаетс тем, что в пневматическом усилителе, содержащем установленный в корпусе мембранный блок, входную глухую каме15 ру, две проточные камеры, перва из которых, расположенна между мембраНЕ1МИ , соединена с атмосферой и с осевьм каналом в штоке жесткого центра мембранного блока, а вто20 ра - с выходным каналом, канал питани , клапаны питани и сброса, выполненные с общей подпружиненной заслонкой и с двум концентрично расположенными седлами, причем сед25 лом клапана сброса вл етс торец штока жесткого центра, в корпусе установлен с возможностью осевого перемещени плунжер, в котором выполнены седло клапана питани и This goal is achieved by the fact that in a pneumatic amplifier containing a membrane unit installed in the housing, an inlet dummy chamber, two flow chambers, the first of which, located between the membrane, are connected to the atmosphere and the axial channel in the stem of the hard center of the membrane unit and 20 Pa - with output channel, supply channel, supply and reset valves, made with a common spring-loaded damper and with two concentric seats, and the seat of the reset valve is the end of the rigid center rod, in the case of Credited axially movable plunger defining a supply valve seat and

Claims

30 a chamber connected to the feed channel and a common spring-loaded damper located therein. The drawing shows a diagram of the pneumatic amplifier. The device consists of a housing 1, divided by a membrane unit 2 with a rod having an axial channel 3, into three chambers: an input 4 and two flow-through 5 and 6, a flow-through chamber 6 at the same time being a negative feedback camera. The fourth chamber 7 is formed by the body of the plunger 8 and the valve 9, held in the upper position by the spring 10. The center channel 3 through the flow chamber 5 is connected to the atmosphere. The device contains a valve group with two concentric seats, 11 and 12, and a common valve 9. The saddle 11 of the relief valve is made at the end of the stem of the membrane unit 2, and the saddle 12 is made in the plunger 8 and together with the valve forms a food valve. Plunger 8 is equipped with sealing elements 13 and 14. In case 1, there is an annular groove 15, and in plate 8 there are radial holes 16 through which chamber 7 is connected to power channel 17. Using screw 18, plunger 8 can be moved in the axial direction. Camera 6 is connected to the output channel 19. The device operates as follows. If there is no pressure in chamber 4, valve 9 closes both saddles and there is no pressure at the amplifier output. When the pressure Pg is supplied to the chamber 4, the balance of forces on the membrane unit 2 is disturbed. leads to the downward movement of the diaphragm block, to the closing / of the saddle 11 of the relief valve and to the opening of the saddle 12 of the feed valve. The air supply pressure enters the chamber 6 and the output 19 of the amplifier, as a result of which a negative pressure 6 chamber will be pressurized, balancing the membrane unit 2. The device realizes the dependence РВЫХ 1 -Рвх-gain factor; and S (h) are the effective areas of the membrane of the entrance chamber 7 and the negative feedback chamber b, respectively; h - movement of the membrane unit. The gain factor K is adjusted by shifting with the screw 18 of the plunger 8 and with it the membrane unit.

2. When moving the membrane unit 2, there is a simultaneous change in the effective areas of all membranes and a change in the gain of the device. For example, by moving the plunger 8 upward, the effective area of the upper membrane increases, the area of the lower membrane decreases, and the gain increases. As the plunger moves downwards, the opposite is true. The proposed device can operate in a supply pressure range of 2-10 kgf / cm and provides a wide range of gain, which allows it to expand its functionality, used in automatic control systems of various technological objects. Pneumatic amplifier containing a membrane unit installed in the housing, an inlet blind chamber, two flow chambers, the first of which, located between the membranes, is connected to the atmosphere and to the axial channel in the stem of the rigid center of the membrane unit, and the second to the output channel, channel power supply, power and relief valves, made with a common spring-loaded damper and with two concentric mounted seats, the relief valve seat being the end of the stem of the hard center, characterized in that expanding the field of application, the amplifier housing is mounted with the possibility of axial movement of the plunger, in which the valve seat and chamber are connected, connected to the feed channel and to the common spring-loaded damper located in it. Sources of information taken into account in the examination 1. Systems and pneumatic automation devices. M., Science, 1969, p. 220, Fig. 1. 2, Copyright certificate S.CHCH 676769, cl. F 15 C 3/04, GZ.N (prototype).