RU2730428C1 - Small pressure receiver - Google Patents

Abstract

FIELD: instrument engineering.SUBSTANCE: invention relates to instruments – small pressure sealed pressure receivers, which are used in aircrafts to receive full and static air flow pressure. Small-sized pressure receiver comprises head part and holder with channels of full and static pressure and is equipped with housing with channels of full and static pressure, in axial cavity of which, tightly closed cover, head part is located, and in axial hole of housing there is a sleeve, in which there is a holder in form of a rod, channels of full and static pressure of which pass to ends in corresponding to them perpendicularly located thickening channels and channels of rod head part, note here that rod with its thickening faces the source of pulse pressure and is installed with possibility of communication after channels actuation in bulge with channels of full and static pressure of the case, and with possibility of pressing the collar to bulge of fixing element ring body.EFFECT: reduced effect of external atmospheric factors during storage and operation of small pressure receiver, increased reliability of its operation and elimination of necessity of maintenance during the whole service life.1 cl, 2 dwg

Description

The invention relates to the field of measuring technology, in particular, to devices - small-sized sealed pressure receivers, which are used in aircraft to receive the total and static pressure of the air flow.

Known analogue under the name "Combined pressure receiver", and.with. USSR No. 932318 dated 07/10/1980, IPC G01L 19/00, which

contains receivers of total and static pressure, a holder with a static pressure fitting, inside which a communication channel of the total pressure receiver with the full pressure fitting is located.

The communication channel is made in the form of an elastic hose, and the holder is connected to the total pressure receiver by means of a thread. Elastic sealing rings are introduced into the pressure receiver, which create the necessary tightness.

In this pressure receiver, the service life is increased during its operation in dusty streams, due to its collapsible design, which allows mechanical cleaning inside its cavities.

However, to carry out mechanical cleaning of the cavities, it is necessary to take this receiver out of operation and carry out its complete disassembly, which is a disadvantage of this design. In the claimed invention, maintenance and cleaning is not required throughout the entire service life.

Known analogue, which is selected as a prototype under the name "Receiver of air pressure" and.with. USSR No. 1809340 dated 04/08/1991, IPC G01L 19/00.

According to the prototype, the air pressure receiver contains a receiving device consisting of a head part and a holder rigidly connected perpendicularly, and channels for receiving the total and static pressure.

In the known invention, inside the cylindrical body of the head part, parallel to its axis, there is a receiving tube with a receiving opening for receiving the total pressure, connected by a channel to the full pressure fitting. The holder is attached along the normal to the outer surface of the body and has a channel with a receiving hole for receiving static pressure, connected to the fitting. The receiver is located across the flow and is designed to determine the total and static pressure.

The disadvantage of the prototype is that it does not ensure the tightness of the internal cavities (full and static pressure channels) relative to external influencing factors, thereby not providing the required level of reliability.

The problem to be solved by the claimed invention is to improve the reliability of the pressure receiver.

The technical result to be achieved by the claimed invention is to reduce the influence of external atmospheric influencing factors during storage and operation of a small-sized pressure receiver by sealing the channels for receiving full and static pressure (body with a cover), which leads to an increase in the reliability of its operation and eliminates the need for maintenance throughout the entire service life.

The specified technical result is achieved in that a small-sized pressure receiver containing a head part and a holder rigidly connected perpendicularly with full and static pressure channels, according to the invention, is equipped with a body with full and static pressure channels, in the axial cavity of which the head part is located with a hermetically sealed cover, and in the axial hole of the body is equipped with a bushing, in which a holder in the form of a rod is located, the channels of full and static pressure of which, at the ends, pass into the corresponding perpendicularly located channels of the thickening and channels of the head of the rod, the thickening of the rod facing the source of impulse pressure fixed at the end of the body and is installed with the possibility of communication after the channels in the bulge are triggered with the channels of the full and static pressure of the body, and with the possibility of pressing the bulge against the shoulder of the body of the locking element in the form of a ring, installed in the annular gap between the sleeve and stock.

In addition, to protect all channels of full and static pressure from the pressure and combustion products of the impulse pressure source, the pressure receiver is equipped with a sealing collar fixed on the thickening of the stem and installed in the bushing.

Implementation of a small-sized pressure receiver in the form of a cylindrical body with channels for receiving full and static pressure and an axial hole with a sleeve installed in it, in which a holder is located in the form of a rod with channels of full and static pressure passing into the corresponding perpendicularly located channels of thickening at its end and channels of the head part located in the axial cavity of the body, hermetically closed by a cover fixed on the body, the position of the stem with the possibility of communication after the operation of the channels of full and static pressure in its thickening, with the channels of the full and static pressure of the body, ensuring after actuation of the compression of the stem by the thickening to the shoulder the housing of the fixing element in the form of a ring, installed in the axial clearance between the sleeve and the rod, made it possible to increase the reliability of operation and eliminate the need for maintenance of the small-sized pressure receiver throughout the entire service life.

The presence in the claimed invention of the features that distinguish it from the prototype, allows it to be considered as corresponding to the condition of the invention "novelty".

New features, which contain the distinctive part of the claims, are not identified in technical solutions for a similar purpose. On this basis, we can conclude that the claimed invention meets the condition "inventive step".

The invention is illustrated in the drawing.

FIG. 1 shows the design of a small-sized pressure receiver in the initial state.

FIG. 2 shows the design of a small-sized pressure receiver in an actuated state.

The following items are shown in the drawings:

1 - Housing;

2, 3, 4 - Full pressure channels of the body;

5, 6, 7 - Static pressure channels of the body;

8 - Axial cavity;

9 - Cover;

10 - Head part;

11 - Axial hole;

12 - Bushing;

13 - Stock;

14 - Channel of full stem pressure;

15 - Channel of static pressure of the rod;

16 - Channel of the full pressure of the stem in its thickening;

17 - Channel of static pressure of the rod in its thickening;

18 - Thickening of the stem;

19 - Channel of full pressure of the head part;

20 - Channel of static pressure of the head part;

21 - Source of impulse pressure;

22 - stock collar in its thickening;

23 - body collar;

24 - Locking element in the form of a ring;

25 - annular gap;

26 - Membrane;

27 - Sealing cuff;

28 - body grooves;

29 - Stem grooves.

A small-sized pressure receiver (Fig. 1, 2) contains a cylindrical body 1 with full 2, 3, 4 and static 5, 6, 7 pressure channels. A bushing 12 is installed in the axial hole of the housing 1, in which a receiving device is installed, consisting of a head part 10 rigidly connected perpendicularly and a holder in the form of a rod 13 with channels of full 14 and static 15 pressure, passing into the thickening channels 16 corresponding to them perpendicularly located on its ends , 17 and channels 19, 20 of the head part 10, located in the axial cavity 8 of the body 1, and a hermetically sealed cover 9, fixed to the body 1 by welding, which ensures the tightness of the pressure receiver in the initial state, thereby protecting the pressure receiving channels 2, 3 , 4, 5, 6, 7, 14, 15, 16, 17, 19, 20 from the influence of external atmospheric factors, which leads to an increase in the reliability of work. The rod 13 by the thickening 18 interacts with the sealing collar 27 installed in the sleeve 12 from the side of the pulse pressure source 21 and attached to the bulge 18. The pulse pressure source 21 is attached to the end of the housing 1 by means of a threaded connection. At the end of the housing 1 from the side of the pulse pressure source 21, a membrane 26 with a weakened section is installed to optimize the operation of the pulse pressure source 21. The membrane 26 is sealed to the body 1 by welding and is made of non-plastic metal. In the annular gap 25 between the sleeve 12 and the rod 13 at the level of the full 2 and static 5 pressure channels of the body 1, an O-ring 24 made of a ductile metal, for example, annealed copper, is pressed into the sleeve 12.

The device works as follows.

The pressure receiver is placed inside the aircraft (LA) so that the metal cover 9 is in the same plane with the aircraft surface (that is, with the aircraft body). In the initial state (Fig. 1), the rod 13 with the head part 10 is in the housing 1 hermetically sealed by the cover 9, the channels for receiving the full 2 and static 5 pressure in the housing 1 communicate with each other through the cavity formed by the groove in the ring 24 and the surface of the sleeve 12.

When the pressure receiver is transferred to the triggered state (Fig. 2), a pulsed pressure source 21 is activated by the gas pressure created by it, the weakened section in the membrane 26 is destroyed and the gas pressure begins to act on the cuff 27 connected to the rod 13. Under the action of the gas pressure, the cuff 27, the rod 13 and the head part 10 begin to move, destroying the metal cover 9 with the head part 10. The head part 10 and the rod 13 protrude beyond the surface of the destroyed cover 9, while the channels of the total 19 and static 20 pressure of the head part 10 are able to receive the full and static pressure of the oncoming flow. Moving in the sleeve 12, the rod 13 with the collar 22 of the thickening 18 moves the ring 24 until it stops in the collar 23 of the housing 1 and crushes it. The ring 24 under the action of the load is deformed and flows into the grooves 28 and 29 made in the housing 1 and in the rod 13, respectively, thereby achieving the tightness of the pressure receiver and the firm fixing of the rod 13 in the housing 1 in the actuated state. After moving the rod 13 to the working position, the channels for receiving the full 16 and static 17 pressure of the rod 13 in its thickening and the corresponding channels for receiving the full 2 and static 5 pressure in the body 1 are combined, while the channels in the body 1 receive the full 2 and static 5 pressures hermetically are divided into two independent channels, thereby achieving the operability of the pressure receiver in the triggered state.

The presented data indicate the fulfillment of the following set of conditions when using the claimed invention:

- a small-sized pressure transducer embodying the claimed invention in its implementation relates to the field of measuring technology, in particular, to devices - small-sized sealed pressure transducers, which are used in aircraft to receive the total and static pressure of an air flow;

- for the claimed device in the form in which it is described in the claim, the possibility of its implementation is confirmed;

- a pressure transducer embodying the claimed invention in its implementation is able to provide high reliability and the required tightness. Therefore, the claimed invention meets the condition of "industrial applicability".

Claims (2)

1. A small-sized pressure receiver containing a head part rigidly connected perpendicularly and a holder with full and static pressure channels, characterized in that it is equipped with a body with full and static pressure channels, in the axial cavity of which, with a hermetically sealed cover, the head is located, and in the axial bore of the body is equipped with a bushing, in which a holder in the form of a rod is located, the channels of full and static pressure of which at the ends pass into the corresponding perpendicularly located channels of the thickening and channels of the head of the rod, and the rod with its thickening faces the source of impulse pressure fixed at the end of the body, and is installed with the possibility of communication after the channels in the thickening are triggered with the full and static pressure channels of the body, and with the possibility of pressing the thickening collar against the body shoulder of the locking element in the form of a ring, installed in the annular gap between the sleeve and the rod. 2. The device according to claim 1, characterized in that it is equipped with a sealing collar fixed on the thickening of the stem and installed in the bushing.

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