JPS5999231A - Pressure replacing device for high temperature - Google Patents

Abstract

PURPOSE:To allow use even for fluid of about 450 deg.C by coupling the 1st pressure diaphragm which is displaced by the pressure of fluid to be measured and the 2nd pressure diaphragm which replaces external force with the pressure of a pressure transmitting medium, through a cooling system. CONSTITUTION:A pressure regulator 7 consists of the 1st pressure diaphragm 22 which is attached to the flange 71 of the high-pressure side pressure outlet of a hermetically sealed tank and displaced by the pressure of fluid 30 to be measured and the 2nd pressure diaphragm 23 provided in a recessed part 21. The pressure diaphragms 22 and 23 are coupled together by the stem for cooling 26 having a cooling fin 26, so the pressure of the fluid 30 applied to the pressure diaphragm 22 is tansmitted to the pressure transmitting medium 13 through the pressure diaphragm 23 and measured. A cooling medium 29 having constant pressure is flowed through the recessed part 24 between the pressure diaphragms 22 and 23 through a piping connection port 28, so the fluid 30 to be measured is cooled even when having >=about 450 deg.C and the characterstics of the pressure transmitting medium 13 never deteriorate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used, for example, in a pressure measurement system or a differential pressure measurement system, and is capable of controlling the pressure of a high-temperature fluid without impairing the pressure transmission characteristics of the pressure transmission medium. This invention relates to a high-temperature pressure replacer that replaces the pressure to

Next, a conventional pressure displacement device will be explained based on the drawings.

FIG. 1 is a block diagram of a liquid level measuring system using a conventional pressure displacement device, and FIG. 2 is an enlarged longitudinal cross-sectional view of a main part S in FIG. 1. Identical parts in FIG. 1 and FIG. 2 are given the same reference numerals.

In Fig. 1, 1 is a sealed tank containing the liquid to be measured 2, 3 is a gas such as steam on the surface of the liquid to be measured 2, 4 and 5 are pressure outlets on the low pressure side and high pressure side, respectively, and Pe is a gas. 3, Ph is the pressure at the pressure outlet 5, and H is the height of the liquid column from the liquid level of the liquid 2 to the pressure outlet 5. Therefore, if the density of the liquid 2 is r, then there is a relationship expressed by equation (1).

Ph −Pe = r −H・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・(
1) 6 and 7 are pressure replacers on the low pressure side and high pressure side, respectively, which are fluid-tightly connected to the respective pressure impulse pipes 8 and 9 on the low pressure side and the high pressure side, and furthermore, pressure displacement ports 4, 5 are each flanged in a fluid-tight manner with a pressure displacement device 6.7. 10 is a conversion section 10a and a transmission section 10
b, the end of the impulse tube 8.9 opposite to the end connected to the pressure replacers 6, 7 is connected liquid-tightly to the conversion part 10a of the differential pressure converter 10. has been done.

In FIG. 2, 51 is a flange of the pressure outlet 5, and the pressure replacer 7 includes a recess 71a and a t1 of the recess 71a.
It consists of a flange 71 having a through hole 71b provided near the center, and a pressure receiving membrane 72 that covers the recess 71a. The pressure-receiving membrane 72 has its peripheral edge fluid-tightly joined to the flange 71, and the flange 71 is fluid-tightly joined to the seven flange 51 via the packing 11 with bolts 12.12. The impulse tube 9 is connected to the flange 71, and the inside of the impulse tube 9 communicates with the through hole 71b.

Reference numeral 13 denotes silicone oil as a pressure transmission medium sealed in a series of cavities consisting of the inside of the impulse pipe 9, the through hole 71b, and the recess 71B covered with the pressure receiving membrane 72. FIG. 2 shows the configuration of the high-pressure side pressure outlet 5 and the high-pressure side pressure replacer 7 in FIG. 1, but the configuration of the low-pressure side pressure outlet 4 and the low-pressure side pressure replacer 6 in FIG. is also the same as in FIG.

Since the liquid level measuring system shown in FIG. 1 is configured as explained above, the pressure ph at the bottom of the liquid column H is
The gas pressure Pe is transmitted to the converting section 10a of the differential pressure converter 10 via the pressure transmitting medium 13, and the gas pressure Pe is similarly transmitted via the pressure receiving membrane 62 (not shown) in the low pressure side pressure replacer 6 and the pressure transmitting medium 13. is transmitted to the converter 10a. In the converter 10a, the transmitted positive force Ph and the pressure difference Ph - Pe of PeO are converted into, for example, an electric signal, and this electric signal corresponds to the height H of the liquid column according to equation (1). This signal is transmitted to the outside of the differential pressure converter 10 via the transmission section 10b. Therefore, the liquid level of the liquid to be measured 2 can be measured by this signal transmitted to the outside.

In the liquid level measurement system shown in FIG. 1, the pressure receiving membrane 72.62 and the pressure transmission medium 13.13 in each of the EFjE M exchangers 7, 6 on the high pressure side and the low pressure side are omitted, and the liquid to be measured 2 and the gas deprived are removed, respectively. In principle, it is also possible to directly lead the liquid to the differential pressure converter 10 via the pressure conduits 9 and 8 to measure the liquid level. However, in such a case, when a pressure change occurs in the gas 3, the gas 3 in the impulse tube 8 and the liquid 2 in the impulse tube 9
Since the propagation speed of the pressure change is different between the two, the pressure change does not reach the converter 108K of the differential pressure converter 10 at the same time, so the Ph-Pe detected by the converter 10a is rH
, which causes an error in the measured liquid level. Naturally, measurement errors also occur when the gas 3 or the liquid 2 to be measured that is introduced into the converting section 108 corrodes the converting section 1a. Furthermore, generally the converter 10a is 100"O
Converter 1 cannot withstand temperatures higher than 100°C, so if gas 3 or liquid 2 to be measured is high temperature and impulse pipe 8.9 is short, converter 1
(If Ml exceeds 100°0, a measurement error will also occur in this case. The pressure receiving membranes 72, 62 and the pressure transmission medium 13, 13 in the liquid level measuring system shown in Fig. 1 prevent the occurrence of measurement errors as described above. When the liquid 2 or gas 3 to be measured is at a high temperature, when the liquid 2 or gas 3 corrodes the conversion part 10a, or when it is necessary to install a long impulse pipe 8.9, etc. In the case of pressure-receiving membrane 72.62
If pressure transmission medium 13.13 is used, even if the liquid 2 or gas 3 is at a high temperature, if the impulse tubes 8 and 9 are made long, the temperature of the converter 10a can be reduced to 100°C by heat dissipation in these parts.
(5) In this case, even if the impulse tubes 8 and 9 become longer, the insides of the impulse tubes 8 and 9 are both filled with silicone oil as the pressure transmission medium 13. There is no time difference in pressure transmission in the groove pressure pipe. In addition, the pressure receiving membranes 72 and 62 are connected to liquids 2 and 62, respectively. If it is made of a material that is not corroded by the gas 3 and the silicone oil 13, the conversion part 10a
is formed so as not to be corroded by silicone oil, so that the converting portion 10a is not corroded by liquid 2 or gas 3.

The conventional pressure displacement device shown in FIGS. 1 and 2 has the functions described above, and silicone oil is generally used as the pressure transmission medium. . However, the heat resistance limit of silicone oil is usually about 350 to 400°C in a closed system, and when the temperature exceeds this temperature, the quality deteriorates and the pressure transmission characteristics are extremely deteriorated.

In other words, conventional pressure displacement devices that use silicone oil as a pressure transmitting sand body have the disadvantage that they cannot be used for fluids with temperatures above about 350 to 400 degrees (6). was there.

The present invention provides a pressure displacer that transmits the pressure of a fluid to be measured to a pressure transmission medium via a pressure-receiving membrane, and a first pressure-receiving membrane that displaces the pressure-receiving membrane of the pressure transducer by the pressure of the fluid to be measured, and a first pressure-receiving membrane that transfers an external force to the pressure. a second pressure-receiving film that replaces the pressure of the transmission medium, the first pressure-receiving film and the second pressure-receiving film are connected by a cooling stem, and the first pressure-receiving film and the second pressure-receiving film are By providing a plurality of communication holes for a cooling medium in the flange of the pressure replacer, which communicate the space connected by the cooling stem between the two and the outside of the pressure replacer, the pressure of silicone oil can be transmitted. 350-4 even when used as a medium
The purpose of this invention is to provide a high-temperature pressure displacement device that can be used for fluids at temperatures above about 50°C.

Next, the present invention will be explained with reference to the drawings.

FIG. 3 is a block diagram of an embodiment of a high-temperature pressure displacement device according to the present invention, in which (A) is a longitudinal sectional view, and (B) is an enlarged view of the cooling stem 26 in FIG. FIG.

In FIG. 3 (71!), the pressure displacement device 7 is shown connected to the pressure guiding pipe 9 for convenience of explanation.

In FIG. 3, the same parts or parts having the same functions as in FIGS. 1 and 2 are given the same reference numerals.

In FIG. 3, 71c is a bolt through hole provided in the flange 71, 21 is a cylindrical recess of the flange 71, and 22 is a first pressure receiving membrane that covers the cylindrical recess 21. The first pressure-receiving membrane 22 is fluid-tightly joined to the flange 71 at its peripheral edge. 23 is a cylindrical recess 21' (i-1) covered by the first pressure-receiving membrane 22; a second pressure-receiving membrane formed in a direction substantially perpendicular to the axis thereof to form cavities 24 and 25; The second pressure-receiving membrane 23 is fluid-tightly joined to the flange 71 at its peripheral edge.The space 24 is a portion surrounded by the first pressure-receiving membrane 22, the side surface of the cylindrical recess 21, and the second pressure-receiving membrane 23. The space 25 is a quadruple area formed by the second pressure-receiving membrane 23 and the bottom surface of the cylindrical recess 21.The space 26 is a quadruple area formed by the second pressure-receiving membrane 23 and the bottom surface of the cylindrical recess 21.The shaft 26B is passed through one or more cooling fins 26b, and It is a cooling stem in which a shaft 26a and the fins 26b are fixed, and both ends of the shaft 26a of the cooling stem 26 are fixed to substantially central portions of the first pressure-receiving film 22 and the second pressure-receiving film 23 by welding or the like. 27,
27 are two communication holes for the cooling medium 29 provided in the flange 71 that communicate the cavity 24 with the outside of the flange 71; 28;
．． 28 is a pipe connection port fixed to the opening in the surface of the flange 71 of the communication hole 27.27 by welding or the like.

Since the through hole 71b of the flange 710 opens into the cavity 25, a series of cavities formed by the aerodynamic force 125, the through hole 71b, and the inside of the pressure pipe 9 are filled with the pressure transmission medium 13. Therefore, in this case, the pressure replacer 7 has a flange 71
, the mud 1 pressure receiving membrane 22 , the cooling stem 26 and the second pressure receiving membrane 23
It is formed by. 30 is a fluid to be measured.

Since the pressure displacement device shown in FIG. 3 has the above-described configuration, the pressure P1 of the fluid 30 to be measured is now equal to the effective area S! When applied to the first pressure-receiving membrane having a pressure of F=(Ps-Po)・
A force St is generated, and this force F is transmitted to the second pressure receiving membrane 23 through the stem 26, so that the pressure transmitting medium 13 has pg=P+・-8l/, where the effective area of the second pressure receiving membrane 23 is 82.
32 +PO (1-8t/SR) (r) Pressure force generation f
Le. Since Sl/S2 in (9) is a constant specific to the pressure replacer 7, P
If O is constant, the pressure P+Fi of the fluid 30 to be measured is the pressure P! The pressure is transmitted to the pressure transmission medium 13 as a pressure P2 corresponding to the pressure P2. Note that if Sl:S2, it is clear that P2=Pl regardless of Po. Although not shown, a circulation device for the cooling medium 29 consisting of a pump, a filter, a heat exchanger, a pressure regulating device, etc. is connected to the piping connections 28 and 28, so that the cooling medium 2
9 flows through the cavity 247 at a constant pressure PO. For this reason, the first pressure receiving membrane 22. The fluid to be measured 30. in contact with the [22.
The second pressure receiving membrane 23 and the pressure transmission medium 1 in contact with the membrane 23
3 are cooled by a cooling medium 29.

In the above embodiment description, two pipe connections 28
. The port 28 may be open to the atmosphere, and in such a case, the connection port 28 may not be provided.

The cooling medium 29 may be a gas such as air or water, or (1
0) Although liquid can be used, it is desirable that the fluctuations in pressure PO in different parts of the cavity be as small as possible. In the above description, the number of communication holes 27 has been described as two, but considering the function of the communication holes 270, there is no problem with the number of communication holes 27 being two or more for the purpose of the present invention.

Next, the present invention will be explained in detail.

That is, in the present invention, as explained in FIG.
A first pressure receiving film 22 displaces the pressure receiving film of the pressure displacement device 7 by the pressure of the fluid to be measured 30, and a pressure transmitting medium 13 that transfers external force.
a second pressure-receiving membrane 23 which replaces the pressure P2 of the first pressure P2;
The pressure receiving membrane 22 and the first pressure receiving membrane 23 are connected by a cooling stem 26, and are further connected by a cooling stem base.
2 and the second pressure receiving membrane 23 and the flange 71
A plurality of communication holes 27 are provided in the flange 71 to communicate with the outside of the pressure replacer 7, that is, the outside of the pressure replacer 7, and a cooling medium 29 with a constant pressure is supplied to the space U through a piping connection port connected to the communication holes 27. Since the flow is made to flow through the first pressure receiving membrane 2
2. A fluid to be measured 30 in contact with the layer 22. Second pressure receiving membrane 23
The heat of the pressure transmission medium 13 in contact with the layer 23 is transferred from the fins 26b of the cooling stem 26 to the air F9.
: As a result of heat being radiated by the cooling body 29 flowing inside the cooling body 24, the receiving pressure [22, 23 and the fluid 30 . The temperature of the medium 13 decreases, and therefore, when the pressure transmission medium 13 is silicone oil, for example, even if the temperature of the fluid 30 to be measured is 350-450'O or more, the pressure due to the deterioration of the silicone oil will decrease. Deterioration of transfer characteristics is prevented. Therefore, a pressure replacer with such a configuration can handle a fluid to be measured that has a temperature higher than the heat resistance limit of the pressure transmission medium without deteriorating the pressure transmission characteristics of the pressure transmission medium. It has the advantage that the pressure can be replaced by the pressure of the pressure transmission medium.

[Brief explanation of drawings]

Figure 1 shows the structure of a liquid level system using a secondary pressure displacement device, Figure 2 is an enlarged cross-sectional view of the main part S in Figure 1, and Figure 3 is a high-temperature pressure system according to the invention. This is a drawing of one embodiment of the replacer.
It is an enlarged side view of the cooling stem 23 in (A). In each figure, 2.3... liquid and gas to be measured as the fluid to be measured, 6, 7... pressure displacement device, 13.
...Pressure transmission medium, 22..., first pressure receiving membrane, 23...
- Second pressure-receiving membrane, 24... void, 26... cooling stem, 27... communicating hole, 30... fluid to be measured, 62.
72...Pressure membrane. (13)

Claims (1)

[Claims] A pressure displacement device that transmits the pressure of a fluid to be measured to a pressure transmission medium via a pressure-receiving membrane includes a first pressure-receiving membrane that is displaced by the pressure of the fluid to be measured, and a second pressure-receiving membrane that replaces external force with the pressure of the pressure transmission medium. a pressure receiving film, the first pressure receiving film and the second pressure receiving film are connected by a cooling stem, and the first pressure receiving film and the second pressure receiving film are further connected by the cooling stem. A high-temperature pressure replacer, characterized in that a plurality of communication holes are provided to communicate a cavity and the outside of the pressure replacer.