JPS5959238A - Fluid diluting apparatus - Google Patents

Abstract

PURPOSE:To always enable dilution to a constant ratio, by a method wherein pressure receiving elements each forming one wall surface of each gas-tight chamber supplied individually with a fluid are connected and the displacement of this connecting means is detected while the fluid of the gas-tight chamber is discharged through a throttle having a predetermined ratio. CONSTITUTION:One wall surfaces of a first and a second gas-tight chambers 1a, 3a individually supplied with a first fluid (e.g., fuel F) and a second fluid (e.g., air A as a combustion supporting fluid) are formed by a first and a second pressure receiving elements 5, 6 which are, in turn, connected by a connecting means 7 and the displacement of the connecting means 7 is detected by a second fluid jet nozzle 9. In addition, an amplifying means 11 for amplifying the back pressure of the nozzle 9 is provided to a second fluid introducing pipe 4 while a constant pressure chamber 12 is arranged to a first fluid introducing pipe 2 and the fluids are discharged to a branched pipeline 15 from the first and the second gas-tight chambers 1a, 3a through throttles 13, 14 each having a predetermined ratio. By this simple constitution, the first fluid can be diluted always to a constant ratio by the second fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid dilution device that dilutes, for example, various types of fuel with air at a constant rate.

In recent years, there has been a demand for continuous and instantaneous measurement of the calorific value of gas for the purpose of controlling the refining process of city gas, etc. or for trading. Gas calorimeters have been developed in which a gas diluted with a combustion-supporting fluid such as air or oxygen is passed through and the heat of oxidation reaction of the gas by an oxidation catalyst is detected by a temperature sensor.

Therefore, there is a need for a device that always dilutes a fuel such as gas as a base fluid at a constant ratio with a combustion support fluid as a diluent fluid, and there is a strong demand for such a dilution device.

The present invention has been made in response to such demands, and includes a connecting means for connecting pressure receiving elements forming one wall surface of an airtight chamber to which fluid is supplied to each individual, a nozzle for detecting displacement of the connecting means, The present invention provides a fluid diluting device that always dilutes the fluid at a constant ratio with an extremely simple configuration including a branch pipe line for leading out the fluid in the airtight chamber through a throttle having a predetermined ratio. Hereinafter, the configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of a main part of a fluid diluting device according to the present invention.
A first container is shown which has a first airtight chamber 1a into which a first reference fluid, for example fuel F, is supplied via an inlet pipe 2. Reference numeral 3 denotes a second container having a second airtight chamber 3a into which a second fluid for diluting the first fluid, for example, air A serving as a combustion support fluid, is supplied via an introduction pipe 4; 1 Like the container 1, it is opened on one side, and these openings are arranged so as to face each other. These openings are connected to the diaphragm 5 as the first and second pressure receiving elements. It is closed by a bellows 6.

That is, the above-mentioned 1. The second airtight chambers 1a and 3a are
The wall surface is a diaphragm5. It is formed by bellows 6.

1 is the diaphragm 5. A connecting rod serving as a connecting means for connecting the movable parts of the bellows 6, each of which has a diaphragm 5 at each end. It is fixed to the movable part of the bellows 6, and a flapper 8 is provided in the middle to protrude. A jet nozzle 9 is provided opposite the flapper 8 to detect the displacement of the connecting rod 7 by a change in its back pressure. Fluid air A is introduced. Further, a pilot pulp 11 as an amplifying means for amplifying the back pressure of the nozzle 9 is provided in the middle of the introduction pipe 4, and supplies air A to the second airtight chamber 3a according to the back pressure. On the other hand, a non-bleed type pressure regulator 12 called a governor is provided as a constant pressure device in the middle of the introduction pipe 2 to supply a constant pressure.

Said 1st. The fuel F and air A in the second airtight chambers 1a, 3a are passed through a branch pipe through a constriction, that is, a fluid resistance 13.14, having a communication hole 13a114a with an inner diameter corresponding to a predetermined dilution ratio of fuel F with air A. 15. In this branch pipe 15, the first airtight chamber side pipe 15a and the second airtight room side pipe 15b are connected by a connecting part 15C, and are open to the atmosphere or to the inside and outside of the tank, for example, so as not to cause a pressure load. . Therefore, the fuel F and air A are mixed together to form a mixed fluid M, which is sent out. 16 is a sample introduction tube for introducing the mixed fluid M into a sampling circuit (not shown).

In the fluid diluting device configured in this way, the first.
Fuel F and air A supplied to the second airtight chamber 1a+3a
The pressure ratio can be kept constant.

This is because when the pressure of the fuel F supplied into the first hermetic chamber 1a via the pressure regulator 12 changes, even if the change is minute, the diaphragm 5 responds to this change. For this reason, diaphragm 5, heo-7 (
By displacing the connecting rod 7 connecting the two, the gap between the flapper 8 protruding from the rod 1 and the nozzle 9 changes. This change in the gap, that is, the relative pressure change in the second airtight chamber 1a+3a is detected by the change in the back pressure of the nozzle 9. This change in the back pressure of the nozzle 9 is amplified by the pilot pulp 11, and the fuel F
Air A having a pressure balanced with the pressure is introduced into the second airtight chamber 3a.

The fuel F and air A thus maintained at a constant pressure ratio flow into the connecting portion 15C via a fluid resistance 13°14 provided in the branch pipe 15 and having a communication hole 13a114a with an inner diameter corresponding to the dilution ratio. , the fuel F and air A are supplied at a constant ratio to the connecting portion 15C, and dilution at a constant rate is always performed here.

Note that the overall spring constant of the diaphragm 5 and the bellows 6 connected is 1, and the pressure inside the first airtight chamber 1a is P 1 +
4 P l, the pressure inside the second airtight chamber 3a is P2 + ΔP2,
The effective areas of the diaphragm 5 and bellows 6 are AI and A
2. If the amount of change in the gap between the nozzle 9 and the flapper 8 is X, then the force F received by the connecting rod 1 is positive in the upward direction.
The following equation is obtained.

F=A2(P2±7Pz)−AI(PlkaΔP1)x
= F/k-1-x.

X here. corresponds to F-0, that is, the equilibrium point of X, and this equilibrium point X. The change ΔP8 in the nozzle back pressure P8 with respect to the displacement in the vicinity of is ΔPs=-α as shown in FIG.
ΔX (α is a constant). This nozzle back pressure P8+ΔPa
The pressure inside the second hermetic chamber 3a is output accordingly.

P2±ΔP2=β(Ps±ΔP3) In the above equation, if we put these together using the β constant, at the equilibrium point, pl=p2=lnil2=knee=ΔP220A2PB
-AIP1=OL&so PI/pH=A2/AI constant, F=0, x=xo1 Ps=constant, pH-βP8 Therefore, the following equation is obtained.

On the other hand, the height of non-equilibrium ΔPi\0 is Δpl=-AlΔPl
Δx=-(Ai/k)ΔPi, ΔP8-α(Ax/k)
ΔPIΔP2−αβ(Al/k)ΔP1 and ΔFz
A restoring force of =AzΔP2 is generated.

Therefore, the following equation is obtained.

That is, when the effective area of the bellows 6 is large and the spring constant k is small, the pressure ratio between the p% material F and the air A can be made equal to one from equations (1) and (2).

Furthermore, if the fluid conductance of the communication hole 13ap14aO) is CI and C2, and the pressure of the connecting part 15C of the branch pipe 15 is P4, then the desire for fuel F and air A to be controlled by the plate resistances 13 and 14 is Ql, Q2id. It is given by the following equation.

Ql=C1(PI ±ΔPi-P4) ・
... (3) Q2=Cz(P2±ΔP2-
P4) - Old... (4) Here, the following equation is obtained from (31, (J equation).

Therefore, if the second term on the right side of equation (5) can be ignored, then (K
- always constant) is established, and the mixing ratio of the mixed gas M is constant due to the fluid conductances C1 and C2, which are determined according to the inner diameter and overall length of the communicating holes 13aj14a, and constant dilution is realized. Therefore, in order to satisfy the above-mentioned condition, it is necessary that Al=A2.

3 and 4 show a second diagram of the fluid diluting device according to the present invention.
and a sectional view of a main part showing a third embodiment. In these figures, members that are the same or equivalent to those shown in FIG. The embodiment shown in FIG. 3 is a case where the first and second containers 1 and 3 are arranged in parallel, and the connecting rod 7 has a diaphragm 5 at each end.
．． It is connected to the bellows 6 and is swingably supported by a support member 17. Therefore, fuel F and air A
is the first. In the second airtight chamber 18#3a, the nozzle 9.
The flapper 8 keeps the υ pressure ratio constant, and the fluid resistance 13
．． A constant dilution is performed via 14.

In the embodiment shown in FIG. 4, two similarly formed bellows 1B and '18 are connected by a connecting plate 19 instead of a diaphragm. In the case where the second airtight chambers la and 3a are defined, the first. The second airtight chambers 1a, 3a have a peripheral wall that is similar to that of the first airtight chamber. It is formed by a bellows 18.18 as a second pressure receiving element. Therefore, instead of a container as used in other embodiments, a flat plate member 20 with a through hole is used.
°20 is used. 1st. Second airtight room 1a/3a
The pressure change in the bellows 18.18 is expressed as the relative displacement of the bellows 18.
Flapper 8. Detected by the nozzle 9, the first and second airtight chambers 1
The pressure ratio of a+3a is kept constant. As a result, the fuel F
, the air passes through fluid resistance 13.14 and is diluted to a predetermined ratio.

In addition, in the above embodiment, the communication hole 13al is used as the diaphragm.
Although the fluid resistances 13 and 14 having a diameter of 14a are provided, the present invention is not limited to this communication hole, for example, it is of course possible to use a single through hole, and any other fluid having the same function may be used. It can be anything.

As explained above, according to the present invention, the first. A second fluid is supplied to each of the first. The second airtight wall surface is formed of pressure-receiving elements, and the first and second air-tightness The pressure ratio of ';J';1+second fluid in the room can be kept constant. In addition, since it is equipped with branch pipes connected through apertures of a predetermined ratio,
The first fluid and the second fluid can be mixed in a fixed ratio.

Therefore, there is an effect that the first fluid, that is, the fuel, can always be diluted with the second fluid, that is, air at a constant rate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing a first embodiment of a fluid diluting device according to the present invention, FIG. 2 is a graph showing the relationship between nozzle back pressure P8 and the gap X between the nozzle and flapper, and FIG. Fourth
The figure is a sectional view of main parts showing second and third embodiments of the fluid diluting device. 1a + 3a battle...Fyo No. 1. 2nd airtight chamber, 5ΦO chamber, tire flam, 6... bellows, s@-... flapper,
S... Nozzle, 11.00. Pilot valve, 1
2φ0...Pressure regulator, 13.14...Fluid resistance,
15...Curious branch pipe. Patent applicant Yamatake Honeywell Co., Ltd. Agent Masaki Yamakawa (and one other person)

Claims (1)

[Claims] 1st. A second fluid is supplied to each of the first. a second airtight chamber, first and second pressure receiving elements forming one wall surface of these airtight chambers, a connecting means for connecting these pressure receiving elements, a second fluid jetting nozzle for detecting displacement of the connecting means; an amplifying means provided in the second fluid introduction pipe to amplify the back pressure of the nozzle; a constant pressure device provided in the first fluid introduction pipe; A fluid diluting device characterized by comprising a branch pipe led out from the second airtight chamber through a throttle having a predetermined ratio and connected to the branch pipe.