RU224024U1 - Diaphragm pressure switch - Google Patents

Abstract

The utility model relates to instrument making, namely to devices that convert the movement of a sensing element under the influence of gas or liquid pressure into an electrical signal, and can be used as a device that issues a control signal when a given pressure difference of the medium is reached. The membrane pressure alarm contains a housing with fittings, a corrugated membrane, a stop for limiting the travel of the membrane, a rod, a connecting element in the form of a double-armed lever, a spring assembly, an actuator, an electrical connector element and three sealed working cavities. The first and second working cavities are separated by a membrane, the third cavity is separated from the second by a seal along the rod. The rod contains a support. The surface of the support in contact with the membrane corresponds to the profile of the membrane. The membrane stroke limitation stop contains channels for the passage of the working fluid to the membrane. There is a gap between the signaling device body and the rod support for the passage of the working fluid to the membrane. The technical result consists in expanding the options for using a membrane pressure alarm. The technical result is achieved by containing more than one working cavity in the signaling device, which allows its use in many circuits of control devices and process control in hydraulic or pneumatic systems of equipment, for example, for regulating engine fuel supply (flight speed) of aircraft, or a circuit using all sealed cavities when it is necessary to use a pressure difference across the differential area between the rod and the membrane.

Description

The utility model relates to instrument making, namely to devices that convert the movement of a sensing element under the influence of gas or liquid pressure into an electrical signal, and can be used as a device that issues a control signal when a given pressure difference of the medium is reached.

In modern devices, membranes are widely used as sensitive elements for various purposes [1. With. 25, 47-48, fig. 7, 8, 24.], [2. With. 221-225.], and in each specific case their purpose is determined by the diagram of the devices for their use.

A membrane pressure alarm is known [3.], which converts the movement of a sensing element under the influence of gas or liquid into an electrical signal. The alarm device contains a housing in the form of a threaded fitting for supplying pressure, which contains a corrugated membrane, a base containing a stop to limit the stroke of the membrane, a rod, contacts fixed to the racks using plates, a spring, as well as an electrical connector, where the contacts are closed and opened with using a rod having a mechanical connection with the membrane.

The circuit of the signaling device [3.] with one-sided activation of the membrane does not allow it to be used to register a control signal when a given differential pressure of the medium is reached, for example, from air pressure receivers for regulating the flight speed of an aircraft. A pressure switch [4.] was selected as a prototype, containing a housing, a sensitive element made in the form of a piston located with a gap in the housing opening, an elastic membrane in contact with the piston and hermetically connected along the periphery to the housing, a rod located coaxially with the piston and interacting through a lever and spring with a contact element, such as a switch. The elastic membrane is made with a concentric corrugation, and on the piston and in the housing opening there are chamfers concentric to each other, between which the membrane corrugation is located, and the membrane is located with a gap relative to the housing.

The relay [4.] has the following disadvantage: the relay circuit with one-way membrane activation does not allow its use for registering a control signal when a given environmental difference is reached, for example, from air pressure receivers for regulating the flight speed of an aircraft, which reduces the variability of its use.

The purpose of the proposed utility model is to expand the options for using a membrane pressure alarm.

This goal is achieved by the fact that the membrane pressure switch contains a housing with fittings, a corrugated membrane, a stop for limiting the travel of the membrane, a rod, a connecting element in the form of a double-armed lever, a spring assembly, an actuator, an electrical connector element and three sealed working cavities. The first and second working cavities are separated by a membrane, the third cavity is separated from the second by a seal along the rod. The rod contains a support. The surface of the support in contact with the membrane corresponds to the profile of the membrane. The membrane stroke limitation stop contains channels for the passage of the working fluid to the membrane. There is a gap between the signaling device body and the rod support for the passage of the working fluid to the membrane.

The claimed utility model is illustrated in the drawing. In fig. Figure 1 shows a membrane pressure alarm, containing a housing 1 with a pressure supply fitting 2, a corrugated membrane 3, a stop 4 for limiting the stroke of the membrane 3, a rod 5 with a support 6, a connecting element 7 in the form of a double-armed lever on an axis of rotation 8, kinematically connected to a spring unit 9 and the executive body 10. The executive body 10 contains an output to the recording equipment (not considered in this solution) through an electrical connector 11. The signaling device contains three sealed working cavities: the first working cavity 12, the second working cavity 13, the third working cavity 14. Cavities 12, 13 are separated by a membrane 3, cavity 14 is separated from cavity 13 along rod 5 by sealing unit 15 (the design of unit 15 is not considered in this solution). The signaling device contains an adjusting screw 16 and a transfer unit 17. The stop 4 for limiting the stroke of the membrane 3 contains channels 18 for the passage of the working fluid to the membrane 3, and between the housing 1 of the signaling device and the support 6 of the rod 5 there is a gap 19 for the passage of the working fluid to the membrane 3. The housing 1 also contains fittings 20, 21.

The operating principle of the alarm is based on the ability of the sensitive element (membrane) to bend depending on the amount of pressure supplied to the alarm.

The alarm can operate in different modes, depending on how the alarm is used by the consumer. Let's look at two of them.

In the first mode, excess operating pressure is supplied to cavity 12 through fitting 2 while cavities 13 and 14 are drained through fittings 20 and 21. In the second mode, the differential operating pressure is supplied to cavities 12 and 13 through fittings 2 and 20 while cavity 14 is drained through fitting 21. There may be a scheme using all sealed cavities, when it is necessary to use the pressure difference across the differential area between the rod and the membrane (not considered in this solution.). In all modes, the membrane 3 moves, which leads to the movement of the support 6 with the rod 5, the lever 7 and the elements of the spring unit 9. The lever 7, rotating on the axis 8, through the transfer unit 17 and the kinematic connection affects the actuator 10. The movement of the membrane 3 within the permissible load, it is limited by the stroke of the support 6 and the position of the stop 4 in the body 1.

When the response pressure is reached, the contacts of the switch of the actuator 10 close and open.

Screw 16 adjusts the preload force of the spring assembly 9 when setting the range of operating pressures for the alarm to operate.

The transfer unit 17 closes the contact of the actuator 10, at the same time being a preliminary adjustment element for adjusting the response of the actuator 10.

The technical result consists in expanding the options for using a membrane pressure alarm. The technical result is achieved by containing more than one working cavity in the signaling device, which allows the use of the signaling device in many circuits of process monitoring and control devices in hydraulic or pneumatic equipment systems, for example, for regulating engine fuel supply (flight speed) of aircraft, or a circuit using all sealed cavities when it is necessary to use a pressure difference across the differential area between the rod and the membrane.

The proposed device can be made using standard equipment and materials of domestic production. Thus, the claimed device meets the criterion of “industrial applicability”.

Sources taken into account

1. Weinberg I.B. Handbook for a young instrument operator: Handbook / I.B. Weinberg. - 2nd ed. reworked and additional - M.: Higher School, 1981. - 224 p., ill.

2. Andreeva L.G. Elastic elements of devices / L.G. Andreeva. - M.: MASHGIZ, 1962. - 456 p., ill.

3. Pat. on PM RU 173 876, IPC (2006.01) G01L 12/19, G01L 7/08. Membrane pressure alarm / Bakatova I.V. etc. - Appl. 02/28/2017; publ. 09/15/2017, Bulletin. No. 26.

4. Pat.RU 2106611, IPC G01L 19/12. Pressure switch / Slyusarev O.V. and others - Appl. 02/06/1996; publ. 03/10/1998.

5. Pat. RU 2745007, IPC (2006.01) G01L 7/08. Diaphragm pressure sensor / Dyachkov V.N. etc. - Appl. 03/06/2020; publ. 03/18/2021, Bulletin. No. 19.

6. Pat.CN 201819766, IPC G01L 12/19. Oil pressure alarm for vehicle / Xu Yongji, Li Jianbin, Qiu Hailong. - Application November 20, 2009; publ. 05/04/2011.

7. Pat. RU 2379639, IPC (2006.01) G01L 12/19. Overpressure alarm with a sealed contact chamber / Emtsev E.P., Gadyatsky S.V. - Application 06/30/2008; publ. 01/20/2010, Bulletin. No. 2.

8. Pat.RU 2346252, IPC (2006.01) G01L 12/19. Sensor-relay for measuring pressure / Yakunin A.N. - Application 05/25/2007; publ. 02/10/2009, Bulletin. No. 4.

9. Pat. on PM RU 47 518, IPC (2006.01) G01L 12/19. Pressure alarm / Efimov V.S. etc. - Appl. 02/28/2005; publ. 08/27/2005.

10. Pat. RU 2 014 582, IPC G01L 19/12. Pressure alarm / Kazainis G.Ya. - Application 07/02/1991; publ. 06/15/1948.

11. Mulev Yu.V. Pressure gauges / Yu.V. Mulev. - M.: MPEI Publishing House, 1997.-280 p., ill.

Claims (1)

A diaphragm pressure alarm device containing a housing with fittings, a corrugated membrane, a stop for limiting the travel of the membrane, a rod, a connecting element in the form of a double-armed lever, a spring assembly, an actuator, an electrical connector element, characterized in that the alarm device contains three sealed working cavities: the first and the second the cavities are separated by a membrane, the third cavity is separated from the second by a seal along a rod containing a support; the support surface in contact with the membrane corresponds to the membrane profile; the diaphragm stroke limiting stop contains channels for the passage of the working fluid to the diaphragm, and there is a gap between the alarm housing and the rod support.

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