JPS58729A - Pressure transducer - Google Patents

Abstract

PURPOSE:To elevate both resolution and accuracy, by filling a chamber of the lower side of a large-diameter diaphragm, and a recessed part and a fine hole being in the upper part of a comparatively smaller-diameter bellowphragm, with a noncompressive viscous substance, and sealing them up tightly, in a transducer for converting pressure to a resistance value of a potentiometer. CONSTITUTION:A pressure lead-in port 2 is provided on an upper body 1, a cavity 3 is formed in the inside, and an intermediate body 6 is fitted into the lower surface. In the circumference of an upper flat surface 7 of the intermediate body 6, a large-diameter diaphragm 25 is pinch-stuck to a circular arc-like wall surface 8, a circular arc-like recessed chamber 9 is formed on the lower surface, and they are communicated with each other by plural openings 10, 10. Between the intermediate body 6 and a lower body 12 fastened to the intermediate body 6, a bellowphragm 13 of a comparatively small diameter is pinch-stuck, and a casing 14 is fastened to the lower part of the lower body 12. A piston 18 is stored in the inside of the bellowphragm 13, and a spring 20 is hooked with an adjusting screw 15. 1 or 2 pieces or more of potentiometers 21 are connected to the piston 18 by a lever 22, and a resistance value is varied. A space between the diaphragm 25 and the bellowphragm 13 is filled with a noncompressive viscous substance, and a temperature variation is also detected.

Description

Detailed Description of the Invention The present invention relates to a pressure transducer that converts pressure changes into electrical changes, and is used in various fields such as chemistry, automobiles, and air conditioning control to convert pressure changes into electrical changes. It can be used in all fields where it is converted into and used.

Listing the technologies that convert changes in pressure into electrical changes: ■Piezoelectric effect type that generates electric charge due to pressure. ■Resistance wire and metal resistance foil resistance meter type. ■Uses capacitance of two opposing electrodes; ■Semiconductor pressure sensor using piezoresistance effect. ■Differential transformer pressure sensor. Many others? Several types of pressure sensors have been put into practical use, but most of them require the use of complex and expensive electronic circuits, making the pressure sensor itself expensive, requiring care in handling, etc. The drawback was the price.

In order to eliminate such drawbacks of the prior art, the present invention is inexpensive, easy to use, withstands rough use, and provides an expensive electronic circuit with high neutralization, high B, 7M ratio, and other advanced characteristics. In order to provide a pressure transducer that does not require any additional equipment, is simple, has a temperature sensing ability, and is low in cost and has high pressure resistance, it is characterized by the following features.

＠Sliding type bulge as a part to extract the amount of electrical change. I used a meter. ■Botefushi. A liquid substance was filled between the large diameter diaphragm and the small diameter large diameter diaphragm in order to increase the flow resistance of the meter to change the resistance value of the meter. 0 diaphragm and bep flam and 0! By filling &I with a liquid substance, it becomes possible to utilize the thermal expansion of the liquid, and the pressure-receiving pressure-receiving area on both sides of Dia 7 can be used as a temperature sensing area. O
Mechanical parts such as Tera central gears are manufactured by JI Izuni Stoden-I.
Since the increase in the amount of water is avoided, it is possible to avoid problems such as sagging during jI, and the structure is simplified.

To explain the embodiment of the present invention in terms of sections, (1) is an upper body, which has a pressure introduction port (2) in the upper center, a cavity (3) inside, and a locking part ( 4) is provided. (6) is an intermediate body that is brought together with the lower surface k1 of the upper body, and the outer periphery of this intermediate body is caulked with the locking part (4), or by other methods, the upper body (1) and the intermediate body (6) are connected. stick. (2) is the circumference I! between this upper body and the intermediate body! A diamond 72mm is used to clamp and fix the ks, and the center table is fixed to the bottom of the center. Also, there is a center table (2) at the center of the upper surface of the intermediate body (6), which is slightly lower than the surrounding area. A flat support (7) having approximately the same diameter is formed, and the peripheral section of this flat surface forms an arcuate wall surface (8) for absorbing the slack of the diaphragm. An arc-shaped concave chamber (9) with an open bottom is formed in the center of the lower surface of this intermediate body (6), and the flat surface (7) and the concave chamber (9) are connected to a plurality of pores (to) (to). I'll communicate with you.

The ζO intermediate body (6) and the lower body (6) that attaches to the lower part of the intermediate body
The lower body (6) has a hollow space 02α) in the center thereof, and the casing α◆ is fixed to the lower part thereof. In (g), an adjustment screw (to) is screwed into the casing located below the recessed chamber (9) so as to be adjustable from the outside, and a plurality of external terminals (2) are further attached to the lower part of the casing α fathom. be. (to) is hehafu ^(
This piston (to) is housed inside the piston (to).
A spring ■ is activated between the latching piece (to) and the adjustment screw (to). (2) is casing α→
one or more potentiometers having a vertically slidable lever mounted therein, the lever being connected to the piston; Furthermore, the plurality of O terminals of the meter 71 can be connected by a combination of a printed circuit board (2) having an electronic circuit network, etc., and other conductive materials, or a member such as a flexible printed wiring board (not shown). , and are connected to the external terminal CL.

In addition, the upper body (1) and the intermediate body (hereinafter referred to as "clay") are fixed airtightly by caulking the lock 5 (4) or with a bolt nut (not shown), and are also attached to the intermediate body (6). The lower body (6) is welded by ultrasonic welding or the like, or assembled airtight by loosening.Furthermore, the lower body (6) and the casing α◆ are assembled in a spring bin.
Or fasten with bolts and nuts.

In the figure, the body) communicates with the pressure introduction port (2), and the upper body (1)
The pressure chamber consisting of the diaphragm and the diaphragm (-) is a chamber provided between the diaphragm and the intermediate body (6), and this chamber
The pore (9) and the recess (9) whose lower part is sealed with verofram (9) are integrally formed, and an incompressible liquid substance such as silicone oil, ethylene glycol,
Filled with other liquid substances. In addition, the diaphragm (
By setting the diameter of 2) to be several times larger than the diameter of the velofram (to), the vertical movement of the velofram (to) can be expanded several times.

The present invention has the above-described configuration, and when the pressure from the pressure inlet (2) is transmitted into the pressure chamber, and the pressure is greater than the pressure of the pressure chamber, the diaphragm 4 is pushed downward, and the pressure in the chamber is ) is moved from the pore (g) into the recess (9), and the piston (to) is pushed down via the valve frame (2), and the lever (2) connected to this piston is pushed down. In this case, the movement of the diaphragm (2) is increased in proportion to the amount of movement of the diaphragm in proportion to the reciprocal of the area ratio between the two. For example, if the area ratio between the diaphragm and the bezel is 5:1, when the diaphragm and the bevel are moved by 2 degrees, the tongue of the tongue 7 and 50 will move approximately 10 degrees. This movement moves the piston, which in turn moves lever 4 connected to this piston, causing it to swell. Meter (2)
The resistance value of the resistor is changed continuously.

In this case, how does it react to the applied pressure? Whether or not the meter responds is determined by the spring (1), the latch piece (to), and the adjustment screw (to) against the generated force determined by the product of the effective pressure-receiving area of the dial and the pressure. Since it is determined based on the balance relationship with the biasing force of the sakaki, it can be made to correspond to the diaphragm@O diameter dimension and the tin 9/da@1) spring force.

Next, when a higher %A pressure is applied beyond the pressure response range of this device, the diaphragm 4 and the center disk become intermediate (s) 03F IN (7) 9H1. As shown in ), no more!
Even if a large amount of pressure is applied, there is no risk of damage to the diaphragm itself. .

If this is the case, bem7tsumu is in the room) from! ! 1 Ig(9
), the liquid substance moves inside and meets the spring force, and 0Il.
Even if the pressure is not applied above the maximum response pressure point of this device in the l section, and the excessive pressure applied to the diaphragm (2) is h9,
The impact is 1:10 and 11:00 safe.

Furthermore, the potential meter is 3 years old! Not only can you use the LO slide variable resistor, but you can also use it in two or multiple series. Using resistors, 01 of the resistors are ME
In the force exchange layer, the false 01 is defined as a compensating layer for liquid expansion, and the pressure conversion amount is set without any possibility of temperature change. For example, as shown in tI■1c (, 01 → (21 One variable resistor C21a) is connected to a resistor (A) for sensing pressure changes, and the other variable resistor C21b) is a resistor for correcting liquid expansion or for providing desired characteristics. In addition, as shown in Figure 6, three sliding variable resistors may be connected.In other words, high resistance pin 1 for pressure conversion, and resistance (b) for correction or adding desired characteristics. Put it on,
Furthermore, an additional resistor (c) for correcting component VLC tension, etc. may be used. In addition, as shown in the off-screen image, there are multiple blister beetles. The potentiometer shown in FIG. 5 can also be multi-connected by using two or three meters for output.

In addition, when this device is used as a pressure/temperature converter, in order to improve heat conduction between the mounting part and this device, a threaded portion αh) is provided on the outer periphery of the upper body α, as shown in Fig. 4. It is also possible to conveniently detect the temperature by screwing it into the hole 6 provided in the mounting country.

The present invention as described above has the following effects.゛■ By making the diameter of the diaphragm several times larger than the diameter of the bellophragm, and sealing a liquid substance in the lower chamber of this diaphragm and the recess and pores above the bellows, the diaphragm is Since the movement of the four-piece phragm has been greatly expanded several times in relation to the movement, the movement of the lever of the potentiometer can be increased, and the diameter of the diaphragm has been increased to make the pressure receiving area larger and more flexible. It can respond to minute pressure changes with low precision, and can obtain sufficient resolution and integration.

■ When excessive pressure is applied to the diaphragm, the diaphragm comes into close contact with the flat part and arcuate opening on the upper surface of the intermediate body, preventing damage to the diaphragm and making it possible to sufficiently withstand the excessive pressure. .

■ This device has almost no joints, fasteners, or connecting parts like a link mechanism, so there is no trouble due to discontinuous movement caused by rattling or warping, and as a result, there are no errors, so accurate values can be obtained. You can get it.

(2) Appropriate selection of the characteristics of the viscous substance - From this, it is possible to enhance the temperature sensing ability and to minimize the influence of temperature on the output signal.

[Brief explanation of the drawing]

The drawings show the SA embodiment of the present invention. Fig. 1 is an overall cross-sectional view, Fig. 2 is an overall cross-sectional view in full stroke operation, No. 31 is a bottom view of the same, and Fig. 4 is a double-circuit cross-sectional view. A schematic diagram of a potentiometer and a meter with a resistor added for pressure change sensing and hydraulic expansion correction or desired characteristics. Figure 5 shows two sets of potentiometers and meters, one for pressure change sensing and one for hydraulic expansion Schematic diagram with added resistance for use and parts expansion correction. Schematic diagram 1 when multiple meters are connected. FIG. 7 is a partially broken sectional view of the device used as a pressure/temperature converter. (1) is the upper body, (2) is the pressure inlet, and (6) is the middle i!
1 body, (7) is flat TI, (10 is borehole, (6) is lower body, 03 is bellofram, α◆ is casing, (2) is external terminal, (to) is piston, (e) is Spring, 4 is bulge, meter, (2) is lever, (2) is diaphragm. Patent applicant: Toho Gas Kogyo Co., Ltd.

Claims (1)

[Claims] ■ An upper body (1) having a pressure introduction port (2), and an intermediate body (having an arcuate wall surface (8) for absorbing the slack of the diaphragm (ηoymvsi) with a flat surface provided in the center of the upper surface ( The peripheral edge of a large diameter diaphragm member is clamped and fixed between 6) and 0, and a pressure chamber (2) is provided above the diaphragm, and a chamber (2) is provided below, and a recess (9) with an open lower end is formed. an intermediate body (6) in which the flat surface (7) and the recess are communicated through the pores;
The periphery of the velofram, which has a smaller diameter than the diaphragm section, is clamped and fixed between the lower body (b) and the lower body (b), which has a vacant chamber in the center. Be a7 tsum (
One incompressible viscous substance is sealed in the recess (9) closed in (a), and one or two sliding potentiometers (2) are placed in the casing (b) attached below the lower body (6).
) in the vertical direction, and screw F7 connected to the lever (2) of the potentiometer on the bottom surface of this base plate 50:I.
(to), and this piston (to) and the adjustable screw (to) on the outside of the casing (on the spring between the installed adjustment screw (to)) spring, and the potentiometer and external terminal (b)
A pressure transducer consisting of a ■ The incompressible viscous substance described in item 1 above has temperature characteristics appropriate to the purpose of use and ambient temperature conditions, and is characterized by converting changes in pressure and temperature into changes in electric extenuating power. converter. (1) The potentiometer described in item 1 above has two or more multiple units, one of which measures the influence of a liquid substance that expands due to temperature changes, and the other (1-). A pressure transducer is provided with a compensation means for compensating for errors in potency and meter resistance values caused by temperature effects of component parts. The correction means described in item 4 above includes a potentiometer, a meter Ej
A pressure transducer consisting of a printed circuit board with an additional resistor connected according to the voltage and an electronic network in combination with a correction effect in the O-bottom yv-meter.