SU879314A1

SU879314A1 - Hydrodynamic balanse zero floating compressor

Info

Publication number: SU879314A1
Application number: SU802903154A
Authority: SU
Inventors: Вячеслав Валентинович Витушкин; Вадим Федорович Захарченко; Венедикт Павлович Карягин; Александр Борисович Поляков; Амиран Владимирович Тертерашвили; Виктор Ильич Шкатов
Original assignee: Предприятие П/Я А-7544; Московское Ордена Ленина И Ордена Трудового Красного Знамени Высшее Техническое Училище Им. Н.Э.Баумана
Priority date: 1980-03-31
Filing date: 1980-03-31
Publication date: 1981-11-07

Description

Изобретение относится к области весоизмерительной техники.The invention relates to the field of weighing equipment.

Известны гидродинамические весы, содержащие компенсационную схему подвода газа, выполненную в виде двух сильфонов, связанных между собой трубкой.жесткости, имеющей канал для подвода газа или жидкости[1].Known hydrodynamic scales containing a compensation gas supply circuit, made in the form of two bellows, interconnected by a tube of rigidity, with a channel for supplying gas or liquid [1].

Это устройство не обеспечивает необходимую точность, так как,например, в процессе измерения возникает упругая деформация троса, связывающего свободные концы сильфонов, которая вызывает неравномерную деформацию сильфонов.This device does not provide the necessary accuracy, since, for example, during the measurement process, an elastic deformation of the cable connecting the free ends of the bellows occurs, which causes an uneven deformation of the bellows.

Ближайшим по технической сущности к предлагаемому изобретению является компенсатор ухода нуля гидродинамических весов, содержащий зэк-jq репленный в корпусе сильфон с глухим дном, внутренняя полость которого сообщена с каналом подвода сжатого газа гидродинамических весов[2].Closest to the technical nature of the present invention is a zero-compensator for a hydrodynamic balance, containing a zak-jq bellows replicated in the housing with a blank bottom, the internal cavity of which is in communication with a channel for supplying compressed gas to a hydrodynamic balance [2].

ких весов в разностную схему электрического моста.Weights in the difference scheme of the electric bridge.

На фиг. 1 изображена конструкция компенсатора в соединении с гидродинамическими весами,' на фиг. 2 - разностная схема электрического моста соединения тензорезисторов весов и компенсатора.In FIG. 1 shows the construction of a compensator in conjunction with a hydrodynamic balance, 'in FIG. 2 is a difference diagram of the electric bridge connecting the strain gages of the balance and the compensator.

Компенсатор ухода нуля гидродинамических весов содержит корпус 1, в котором размещен компенсационный силь|фон 2 с глухим дном. В корпусе 1 установлен упругий элемент 3, ориентированный осью чувствительности соосно сильфону 2 и связанный с его глухим дном. Внутренняя полость сильфона 2 связана через систему подвода 4 с сильфоном 5 гидродинамических весов, который жестко закреплен в поршнях би 7. На упругий элемент 3 наклеены тензорезисторы 8-11, соединенные с тензорезиеторами гидродинамических весов 12-15 в разностную схему (в разные плечи) электрического моста с шунтирующим сопротивлением 16 (фиг. 2).The zero drift compensator of the hydrodynamic balance comprises a housing 1, in which a compensating bellows 2 with a blind bottom is placed. An elastic element 3 is installed in the housing 1, oriented along the sensitivity axis coaxially with the bellows 2 and connected with its dead bottom. The internal cavity of the bellows 2 is connected through the supply system 4 to the bellows 5 of the hydrodynamic balance, which is rigidly fixed in the pistons of the bi 7. The elastic element 3 is glued with a strain gauge 8-11 connected to a tensor resistor of a hydrodynamic balance 12-15 in a differential circuit (in different arms) of the electric bridge with shunt resistance 16 (Fig. 2).

Компенсатор работает следующим образом.The compensator works as follows.

При подаче газа высокого давления в систему подвода 4 в гидродинамических весах под действием дайленяи газа возникает растягивающее усилие, которое регистрируется тензорезисторами 12-15. Одновременно давление газа действует на глухое дно сильфона 2, деформирует связанный с ним упругий элемент 3, что регистрируется тензорезиеторами 8-11. Таким образом с электрического моста снимается разность сигналов, получаемых с тензорезисторов 8-11 и 12-15, и под4 бором шунтирующего сопротивления 16 можно получить величину выходного сигнала равного нулю при любом давлении газа.When a high-pressure gas is supplied to the supply system 4 in a hydrodynamic balance under the action of gas pressure, a tensile force arises, which is recorded by the strain gauges 12-15. At the same time, the gas pressure acts on the dead bottom of the bellows 2, deforms the associated elastic element 3, which is recorded by the strain gauges 8-11. Thus, the difference between the signals received from the strain gauges 8-11 and 12-15 is removed from the electric bridge, and by using a shunt resistance 16, it is possible to obtain the value of the output signal equal to zero at any gas pressure.

Описанная конструкция компенсатора позволяет повысить точность эксперимента, упростить конструкцию гидродинамических весов и увеличить диапазон их измерения за счет предварительного растяжения упругих элементов.The described design of the compensator allows to increase the accuracy of the experiment, simplify the design of the hydrodynamic balance and increase the range of their measurement due to the preliminary stretching of the elastic elements.

Claims

The invention relates to the field of weighing technology. Hydrodynamic scales are known, which contain a compensation scheme for the supply of gas, made in the form of two bellows, connected by a tube with a tube, of rigidity, having a channel for the supply of gas or a dislocation 1. This device does not provide the necessary accuracy, since, for example, in the measurement process, elastic deformation of the cable arises, connecting the free ends of the bellows, which causes uneven deformation of the bellows. The closest to the technical essence of the present invention is a hydrodynamic balance zero care compensator, containing a bellows with a deaf bottom embedded in the housing, the internal cavity of which is connected to a hydrodynamic balance channel for supplying compressed gas. 2 The disadvantages of the device include the impossibility of selecting two sylphs with equal effective areas that during the experiment causes unbalanced forces from the pressure of the inlet gas, reducing the accuracy of the experiment; as well as the large size and complexity of the construction of hydrodynamic scales by installing a compensator inside their case. This requires the implementation of a bypass pipe for supplying gas through radial holes. The purpose of the invention is to improve the accuracy and functionality. The goal is achieved by the fact that the compensator is provided with an elastic element installed in the housing, oriented along the axis of sensitivity to the coaxially bellows and connected to its deaf bottom, while the resistance strain gages connected to the strain gages of the hydrodynamic weights are pasted onto the difference circuit of the electric bridge. FIG. 1 shows the structure of a compensator in conjunction with hydrodynamic weights; FIG. 2 is a difference diagram of an electrical bridge connecting the weighers of the scales and the compensator. The care compensator zero hydrodynamic scales includes a housing 1 in which is placed the compensation force of 1 PHONE 2 with a blind bottom. An elastic element 3 is installed in the housing I. It is oriented by the axis of sensitivity coaxially to the bellows 2 and is associated with its deaf bottom. The internal cavity of the bellows 2 is connected through the supply system A with the bellows 5 hydrodynamic scales, which are rigidly fixed in the pistons x 6 and 7. On the elastic element 3, strain gages 8-11 are attached, connected to the strain gages of the hydrodynamic scales 12-15 in a difference scheme ( different shoulders of the electric bridge with shunt resistance 16 (Fig. 2). The compensator works as follows. When a high pressure gas is supplied to the supply system 4 in the hydrodynamic balance under the action of dylen and a gas, a tensile force arises, which is recorded by strain gages 12-15. At the same time, the gas pressure acts on the deaf bottom of the background 2 forces, deforms the elastic element 3 associated with it, which is recorded by the strain gages 8-11. Thus, from the electric bridge removes the difference between the signals received from the strain gauges 8-11 and 12-15, and by shunting the resistor 16, it is possible to obtain an output signal value equal to zero at any pressure of the gas. The described construction of the compensator makes it possible to increase the accuracy of the experiment, simplify the design of hydrodynamic weights and increase the range of their measurement due to the preliminary stretching of elastic elements. Claims Compensator of zero hydrodynamic balance containing a fixed bottom-mounted bellows in the case, the internal cavity of which is connected to the channel for supplying compressed gas to the hydrodynamic scales, with the aim of increasing the accuracy and expanding the functionality it is equipped with an elastic element installed in the housing, oriented along the axis of sensitivity coaxially with the ilfon and connected with its deaf-bottom, while strain gages connected to the strain gages are attached to the elastic element difference in hydrodynamic balance diagram of an electrical bridge. Sources of information taken into account during the examination 1. USSR author's certificate №538242, cl. G 0 G 19/10, 1975,

2.Certificate of the USSR №323669, cl. G 01 .G 19/10, 1969 (prototype).