JPH01500538A - Support cells for pressure pick-up devices, especially made of ceramic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention belongs to the field of means for measuring physical quantities; more precisely, it belongs to the field of means for measuring physical quantities; Akira developed a pressure-measuring cell for its purpose using a known type of pink amplifier device. It is something that

A pressure pin cup with a deformable membrane and a strainer fixed on its surface. Tap devices are already known. The arrangement of the membrane and gauge is such that the current passing through the pickup device The change in the gas signal is proportional to the difference in pressure between the two sides of the membrane. One of the circular ends of the cylindrical case is itself closed with a membrane made of ceramic. It is made up of things.

The first object of the present invention is to completely eliminate the gap between the space created on one side of the membrane and the space created on the opposite side of the membrane. Measurements for the use of pick-up devices of the type mentioned above, which provide excellent airtightness. The aim is to provide regular cells.

Another object of the present invention is to prevent the big amplifier device from being damaged. Pick-ups of the aforementioned type are protected against certain impacts and other mechanical blows. The object of the present invention is to provide a measurement cell for use with a tap device.

A third object of the present invention is to easily access the inside of the case having connection terminals. The purpose is to provide a cell that can be stored in a manner that allows for storage.

According to the invention, the invention generally comprises a pick having a deformable membrane; A pressure measuring cell using a pick-up device, the pick-up device being mounted on a lid. The pick-up device is thus housed within a correspondingly shaped cavity of the cell body held therein. In the pressure measurement cell to be housed, the pink amplifier device is placed in the cavity. Sometimes the lid is sealed hermetically against the cell body at the periphery; This seal is ideally achieved by continuous welding along the entire circumference of the body and lid that contact each other. It is characterized by being carried out.

This arrangement creates a strong mechanical bond between the lid and the cell body due to the welded seal. At the same time, the connection is completely airtight.

The welding process consists of two protruding flanges, each separating the contact area between the body and the lid. It is desirable that it be carried out between people.

With this arrangement, automatic welding of the contact portions becomes possible.

Alternatively, sealing can be done by using adhesive on the contact area between the main body and the lid. Therefore, it can also be realized. In fact, satisfactory resistance can be achieved under a variety of different circumstances. It is known that adhesives or glues with drag properties are commercially available.

According to one other main arrangement of the invention, a cavity containing a pick amplifier device is provided. A passageway is provided to communicate the air with the atmosphere. In the present invention, the passage Multiple embodiments have been proposed.

According to the first embodiment, the passage is arranged in a large orifice located in the center of the lid. The orifice allows the signal line to pass freely through the orifice.

According to a second embodiment, the passageway defines a cavity in which a pick-up device is housed. It communicates with the atmosphere.

In the case of the second implementation type described above, a large Although no orifice is provided in the lid, in the present invention an orifice is provided to allow the passage of cotton. Two variants have been proposed for this purpose.

According to the first variant of the second implementation method, the signal line of the pink-up device traverses the lid via an orifice provided in the The lid is sealed with glass using a technique called ``glass treatment'', which allows the lid to Insulation of the signal line can be obtained compared to the case where the orifice is airtight. This would result in a blockade of .

According to a second variant of the second scheme, the lid has a central part fixed to each other with a peripheral part. Consisting of two parts, the central part is made of more expensive material than the surrounding parts. and includes said orifice sealed with glass.

Finally, regarding the cell of the second type, the present invention provides a raised portion of the cavity of the cell body. a cell having an airtightness and on which the deformable membrane is supported; For fixation such that at the same time a slight mechanical play of the pick-up device is obtained It provides the arrangement of Based on this arrangement, there is only one raised part. with two concentric grooves, one in the so-called central part and the other in the so-called peripheral part These grooves provide additional deformability to the membrane and also provide pressure channels facing the membrane. This helps improve the tightness between the chamber and the cell body cavity.

The present invention will be described below with reference to the accompanying drawings. It will therefore be better understood and the various means involved will become clear. In the drawing, No. FIG. 1 is a sectional view of a cell of the present invention based on a first embodiment.

Figures 1a and 1b show details of each part in Figure 1 before and after welding, respectively. FIG.

FIG. 1C is a longitudinal sectional view of a cell according to the invention in which the lid is made in the form of a plug.

FIG. 2 is a similar diagram of a cell according to a first variant of the second embodiment.

FIG. 3 is a similar diagram of a cell according to a second variant of the second embodiment.

Figure 4 is a cross-sectional view of a cell similar to Figure 2, installed in a fixing case. It is a figure showing a state.

FIG. 4a is a detailed sectional view taken along line A in FIG. 4.

In FIG. 1, the pressure measuring cell, designated as a whole by 1, is a piston with a deformable membrane 3. It includes a back-up amplifier device 2, a cell body 5, and a lid 4.

According to the present invention, the main body 5 and the lid 4 have a welding bead on their periphery along the contact surface. 6 is used for welding. This weld bead is continuous all the way around the cell. and also preferably only on or between the two protruding flanges 7.8. This is also done by simply melting the metal of the flange, preferably without the use of filler metal. It is advantageous if For the protruding flange, the groove is rounded near the edge of the contact surface. It can be formed by

This welded assembly feature is also common to all other embodiments described below. It is something to do.

Based on the first embodiment shown in FIG. 1, the signal line 13 passes through the center of the lid 4. This is done via a large orifice 10 provided in part 4b.

In this first embodiment, it is also possible to take an execution form as shown in Fig. 1e. be. Based on this configuration, the lid has a screw thread on the body 5' with an inner thread groove 9. It is made into a plug 4' shape that can be fitted. When welding by melting, the contact grooves This is done at 6', which is on the apparent upper limit line of the plane marked with. In this marginal case However, the lid can be said to be sealed all around.

Based on the second embodiment shown in FIGS. 2 and 3, the passage of the signal line 13 is , through a small orifice 14 provided in the lid and covered with glass. . This insulates the wire 13 from the lid and provides airtightness of the passage.

This embodiment can be implemented based on two variants. First variant Based on the example (Figure 2), the small orifice 14 is drilled into the lid itself. There is. Based on the second variant (Fig. 3), the small orifice 14 is It is opened in the central part 4b of the lid which is fixed to the lid 4a. The central portion 4b is more Expensive metal, therefore in principle "glass treatment" of the passage part of the orifice 14 It can be made from metals that are more durable. Part 4b is heat welded into part 4a. It can then be pressed against the latter and finally welded there.

In the first embodiment (FIG. 1), the surface of the pickup device 2 opposite to the membrane 3 is , exposed to the atmosphere by the large orifice 10 itself, and also by the two of the second embodiment. In a variant (FIGS. 2 and 3), the book is A vent hole 11 leading into a groove 12 of the lid 4 along the contact surface with the body 5 allows air to be removed from the atmosphere. will be exposed to.

In some of the figures, there are holes drilled oppositely in the lid 4 and in the body 5. It can be seen that there is a centering stop pin 17 housed therein. Bin 17 allows for The pores 11 and the grooves 12 can be aligned.

In FIGS. 4 and 4a, cell 1, which corresponds to the cell in FIG. It is housed in a case 20 that is closed at 1.

On the lid 4 of the cell 1, there is a Two base plates 22 and 23 and a terminal 24 are placed thereon. In this diagram, Notice that the previous diagrams show some details that are not shown accurately. I wonder. In particular, the main body 5 is configured such that the cell can be screwed onto the tip of a conduit under pressure. It can be seen that the inner thread groove 25 is provided.

In the internal space of the main body facing the conduit and membrane 3 under pressure, corrosion or explosion can contain hazardous gases or gas mixtures. Now, this dangerous Only the pick-up device 2 can act as a barrier between the surrounding atmosphere and the surrounding space. Yes, and there may be sparks or other flames in the outside air that could cause an explosion. There is also a risk that equipment that may be corroded may be located there. Ma Furthermore, the pick-up device must have a vanishing point, especially in order not to confuse pressure measurements. shall not constitute a Therefore, the pick amplifier device It is very important that the storage space is as airtight as possible. It becomes important. Therefore, the cell body that constitutes the storage area of the pickup device is The cavity is provided with a raised part 26 on which the membrane 3 rests. this One of the raised parts is the so-called central groove 15, and the other is the so-called peripheral part. grooves 16, said grooves provide further deformability to the membrane and To improve the tightness between the pressure chamber facing the membrane and the cavity of the cell body. Helpful to contain gas get, cement, putty and other air sealing products It is advantageous to do so.

Also, from the same figure, the needle 27 inserted into the hole 28 of the lid 4 is located in the pickup device. The pink-up device itself has a It can be seen that it has a groove for positioning along the generatrix of the book. One secondary aspect of the invention Based on this feature, this groove serves to open the vent hole 11 therein.

The M4 groove 12 is provided to the right of the hole 28. Ventilation hole 11 makes the diagram complicated In order to avoid Ru. As a result, the rear or upper surface of the big amplifier device 2 on the opposite side of the membrane 3 is exposed to outside air. You will be in a state of communication.

For example, the present invention can be applied to chemical facilities that process active gases or explosive gases. It is advantageous for use in measuring pressures or pressure differences in petrochemical facilities.

Above are specific preferred embodiments of the cell of the pressure pickup device according to the present invention. Although the embodiments have been shown and explained, the scope of the present invention is not limited to these embodiments. rather than across all cells with the general characteristics we have already identified. It is.

Taki investigation report 111-i---kPCT/FR87100179ANNEX To THE INTERNATIONA, L 5EARCHREPORT 0NINTER NATIONAL APPI, ICATION No, PCT/FR8710 0179 (SA 17303) DE-A-2248004, 19104/73 tJS-A-381710718106/74DE-A-3344799131 06/85 NoneUS-A-412784028/11/78 NoneD E-A-223469024101/74　’　None

Claims (8)

[Claims] 1. Using a generally cylindrical pickup device (2) with a deformable membrane (3) the pressure measuring cell (1), and the pickup device is connected to the cell body (5) on the one hand; and on the other hand by a lid (4) which serves to hold the pick-up device. In a pressure measuring cell housed in a cavity with a corresponding volume of When the pick-up device is placed in the cavity, the lid (4, 4') (6, 6') to be airtightly sealed to the cell body (5, 5'). Sealing is achieved by continuous welding along the entire circumference of the body and lid where they come into contact. thing A cell characterized by. 2. The cell according to claim 1, wherein each of the welding operations is performed on a main body. and between two protruding flanges (7, 8) separating the contact area of the lid. thing A cell characterized by. 3. In the cell according to any one of claims 1 and 2, Passages (10, 11) for communicating the cavity containing the pickup device with the atmosphere A cell characterized by being arranged with. 4. 4. The cell according to claim 3, wherein the passageway extends at least through the body. (5) consists of ventilation holes (11, 12) passing across the bulkhead; cell to be marked. 5. A cell according to claim 3, in which the passageway is located in the central part of the lid (4). a large orifice (10) provided in the orifice; , thereby allowing free passage of the signal line (13) A cell characterized by. 6. In the cell according to claim 3, the signal line (13 ) traverses the lid via an orifice (14) provided in the lid and connects said orifice. The space is covered with glass using the so-called ``glass treatment method.'' This provides better insulation of the signal line than with a lid, and at the same time, the orifice airtight sealing of the system. A cell characterized by. 7. A cell according to claim 6, in which the lid is mutually connected to the surrounding part (4a). It consists of two parts, the central part (4b) is fixed to the The orifice (14) is made of a more expensive material and is sealed with glass. A cell characterized by: 8. The cell according to any one of claims 1 to 7, comprising a cell main body. said cavity has a raised portion (26) and said deformable membrane rests thereon. In the cell where The raised part is the so-called central part (15) on the one hand, and the so-called peripheral part on the other hand. Part (16) is equipped with two concentric grooves, said grooves allow further deformation into the membrane. It also provides airtightness between the pressure chamber facing the membrane and the cavity of the cell body. Cells characterized by helping to improve.