RU181294U1 - PRESSURE JET RELAY - Google Patents

Abstract

The utility model relates to technical means of automation and can be used in pneumatic automatic control systems, namely in inkjet control systems. An inkjet pressure switch comprises a working chamber formed by a housing, a lower cover with an opening for supplying controlled pressure and an upper cover, and a float located in the working chamber, which can freely move in the vertical direction. In the proposed jet pressure switch, the working chamber communicates with the atmosphere through an opening in the top cover and an adjustable throttle, and through a hole in the housing communicates with the control input of a discrete monostable element, the power channel of which is connected to the pressure source, and the direct and inverse outputs are connected to the jet control device. The technical result is the provision of precise control of pressure in inkjet devices. 1 ill.

Description

The utility model relates to technical means of automation and can be used in pneumatic automatic control systems, namely in inkjet control systems.

There are various devices for measuring and controlling gas pressure, the principle of which is based on the mechanical effect of a gaseous medium on a sensitive element. A sensing element that perceives gas pressure can be, for example, a membrane (Patent No. 2317532 “Pressure Relay”, published on 02.20.08) or a piston (Patent No. 2345340 “Threshold Pressure Transmitter”, published on 01/31/09). These devices are quite complex and are used in pneumatic automation of normal (from 0.1 to 0.2 MPa) and high (up to 1.0 MPa) pressure.

Devices are known in which a pressure sensing element is a float that moves freely in a housing. These devices are designed to measure gas flow. For example, a rotameter measuring the flow rate by the differential pressure method (Patent No. 2200935 "Rotameter", published March 20, 03).

Inkjet control systems operate at low pressure (from 0.001 to 0.01 MPa). Digital nodes of inkjet circuits (triggers with separate inputs, triggers with a counting input, shift registers, etc.) require initial initialization, which is done by supplying a short-time signal of a single level to the circuit before starting work (see "Inkjet logic elements and automatic devices process equipment management. "Industry catalog. Edited by EI Chaplygin, M: VNIITEMR, 1989).

The objective of the proposed utility model is the creation of a simple design pressure switch for inkjet control systems operating in the low pressure range (0.001-0.01 MPa) and ensuring the automatic installation of digital circuit units in the initial state.

The technical result of the proposed technical solution is to provide accurate control of the pressure in the inkjet devices.

The specified technical result is achieved by the fact that in the jet pressure switch containing a working chamber formed by the housing, a lower cover with a hole for supplying a controlled pressure and a top cover, as well as a float located in the working chamber, which can freely move in the vertical direction, the working chamber through the hole in the top cover and the adjustable throttle communicate with the atmosphere, and through the hole in the housing communicates with the control input of the jet discrete monostable element, to cash supply is connected to a pressure source, and direct and inverted outputs are connected with the jet control device.

The installation of an adjustable throttle, connecting the working chamber of the pressure switch with the atmosphere, allows you to fine-tune the value of the controlled pressure. The installation of a jet discrete monostable element with appropriate connections allows you to get a short-term signal of a single level at one of its outputs, and a constant resolution signal of a single level at the second.

The figure depicts an inkjet pressure switch. An inkjet pressure switch includes a working chamber 1 formed by a housing 2, a lower cover 3 and an upper cover 4. An opening 5 is made in the lower cover 3, to which a controlled pressure is applied. An opening 6 is made in the top cover 4, through which the working chamber 1 communicates with the input of the adjustable throttle 7, the output of which is connected with the atmosphere. In the working chamber 1 there is a float 8, which is able to freely move in the vertical direction. The weight of the float is selected so that it rises at a pressure corresponding to the nominal supply pressure of the inkjet elements. A hole 9 is made in the housing 2, through which the working chamber 1 is connected to the control input 10 of the discrete mono-stable element 11. The feed channel 12 of the discrete mono-stable element 11 is connected to a source of controlled pressure, and the inverse output 13 and direct output 14 of this element are connected to the jet control device. As an inkjet discrete monostable element, for example, an ST41 type inkjet discrete element can be used (see "Inkjet logic elements and automatic control devices for technological equipment." Industry Catalog. Edited by E.I. Chaplygin, Moscow: VNIITEMR, 1989 , p. 10, fig. 8).

Inkjet pressure switch operates as follows.

After the supply of compressed air to the device begins, an increase in pressure occurs in the hole 5, in the power channel 12 of the jet discrete monostable element 11 and, accordingly, at the inverse output 13 of this element. After the pressure level reaches the value corresponding to the minimum required for the operation of the inkjet elements (approximately 2.5 kPa), a complete signal of a single level is formed at the inverse output 13 of the discrete monostable inkjet 11. This signal enters the circuit of the inkjet control device to all digital nodes for which an initial installation is required and will bring them to their initial state.

An increase in the pressure entering through the opening 5 to the working chamber 1 to the nominal pressure value of the inkjet elements (approximately 3.5-4.0 kPa) will cause the float 8 to rise and the compressed air through the opening 9 will go to the control input 10 of the inkjet discrete monostable element 11. At the control input 10, a signal is generated sufficient to switch the jet discrete monostable element 11. Element 11 will switch and a zero level signal will be established at inverse output 13. Thus, a single unit signal is removed from the circuit of the inkjet control device. At the same time, at the direct output 14 of the jet discrete monostable element 11, a signal of a unit level is established. He will enter the circuit of the inkjet control device, allowing his work.

The pressure value of the operation of the jet time switch over a wide range can be changed by selecting the appropriate weight of the float 8. More precise adjustment is carried out using an adjustable throttle 7.

If during the operation of the inkjet control device the supply pressure of the inkjet elements decreases to a value less than the nominal value, the float 8 will drop. At the control input 10 of the jet discrete monostable element 11, the pressure becomes insufficient, and this element will switch to its original state. At the inverse output 13, a unit level signal will be established, and at direct output 14, a zero level signal will be established, which will make the operation of the inkjet control device impossible.

The jet pressure switch is simple in design, provides precise control of the required pressure level and has the additional function of automatically setting the digital nodes of the circuit to its original state when the supply pressure is applied.

Claims (1)

An inkjet pressure switch comprising a working chamber formed by a housing, a lower cover with an opening for supplying a controlled pressure and an upper cover, as well as a float located in the working chamber, which can move freely in the vertical direction, the working chamber through an opening in the upper cover and an adjustable throttle communicates with the atmosphere, and through an opening in the housing communicates with the control input of a discrete monostable discrete element, the power channel of which is connected to a pressure source ia, and direct and inverse outputs are connected with the inkjet control device.

Images