JPH09138171A - Bourdon tube pressure gauge indicating mean value - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a Bourdon tube pressure gauge indicating the mean value of pressure varying abruptly at a short period through choking effect for delaying transmission of pressure. SOLUTION: A Bourdon tube pressure gauge 6 commnicates with a diaphragm 2 through a clean encapsulated liquid 3 and the passage thereof is provided with a micro hole 5 for limiting the movement of encapsulated liquid 3. When a pressure varying abruptly at a short period is applied to the diaphragm 2, the pressure is transmitted from the Bourdon tube pressure gauge 6 through a gear 9 to a pressure pointer 10. Since the encapsulated liquid 3 flows slowly through the choking effect of micro hole 5, the pressure is transmitted slowly. Consequently, the pressure pointer 10 follows up the pressure slowly and provides a mean pressure.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]

1) The present invention is a Bourdon tube type pressure gauge attached to a machine such as a pump, a compressor, a blower, an engine, etc. whose pressure changes at short intervals around a certain value at all times, and a Bourdon tube type pressure gauge attached to such a machine. Since it is difficult to read the pressure gauge because the indicator needle of the pressure gauge moves violently, it is a field-installed pressure gauge for such machines that can be replaced by average pressure monitoring. As a result, we devised a Bourdon tube pressure gauge that shows the average value. 2) The Bourdon tube type pressure gauge installed in the field is a Bourdon tube type pressure gauge that measures the pressure that does not change so much due to repeated stress due to the pressure change of the machine. Compared with this, the Bourdon tube pressure gauge installed on a machine with drastic pressure changes has a short mechanical life, and the Bourdon tube pressure gauge that measures a constant and relatively constant pressure has a long mechanical life, and the pressure always changes in a short cycle. We have devised a Bourdon tube pressure gauge that shows the average value and has the same level of mechanical life even when installed in a machine

[0002]

2. Description of the Related Art When a Bourdon tube type pressure gauge is attached to a machine such as a pump, compressor, blower, engine, etc. where the pressure changes in a short cycle, it is necessary to prevent the indication of the Bourdon tube type pressure gauge from fluctuating drastically. By inputting a fixed throttle insect screw into the Bourdon tube pressure gauge stock, or by installing a needle valve type throttle with a variable pattern, the pressure variation range indicated by the Bourdon tube pressure gauge can be entered. The technique of making the pressure smaller than the change width of the pressure is well known.

[0003]

Problems to be Solved by the Invention This has the following drawbacks. 1) When the pressure measurement target is directly measured, stains or lumps of the pressure measurement target may adhere to the diaphragm, or the lump may be clogged, and the throttle hole may be blocked. Without noticing the blockage,
Even if the pressure changes, the Bourdon tube pressure gauge indicates the pressure in the state before the blockage, so the change in the state may be overlooked and the discovery of an abnormality in the machine or device may be delayed. 2) When the Bourdon tube type pressure gauge is attached with an insect screw or throttle, the indicated change of the Bourdon tube type pressure gauge is smaller than the input pressure change width, but the Bourdon tube and gears are always in operation, so mechanical repetitive stress is applied. The metal may be damaged by fatigue. 3) Pressure indicators for machines such as pumps, compressors, blowers, and engines that constantly change their pressure around a certain value in a short cycle, even if the Bourdon tube pressure gauge is equipped with insect screws or throttles. Since the needle is constantly changing, it is difficult to read the instruction accurately, and the current reading method is to read the center of the change.

[0004]

[Means for Solving the Problems]

1) Connect to the pressure introduction part (1) for introducing the pressure measurement object. 2) The diaphragm (2) that receives the pressure of the introduced pressure measurement target is pushed by the pressure of the introduced pressure measurement target and fills the space between the diaphragm membrane (2) and the liquid sealing chamber (4). The clean filled liquid (3) is pushed out to the Bourdon tube type pressure gauge (6), the flow of the filled liquid (3) is transmitted, and the pressure received by the diaphragm (2) is transmitted to the Bourdon pipe (8). The flow of the pressure-transmitted enclosed liquid (3) continues until the introduced pressure (1) and the indication of the Bourdon tube pressure gauge (6) are in equilibrium, and is stopped when they are in equilibrium. 3) The pressure transmission flow of the enclosed liquid (3) due to pressure is
The pressure received by the diaphragm (2) is limited by the minute holes (5) that limit the flow, and the pressure transmission flow moves over time, so the Bourdon tube type pressure gauge (6) takes time.
The movement of the diaphragm membrane (2) and the Bourdon tube type pressure gauge (6) becomes gentle with a time limit that does not change in proportion to a sudden pressure change. Further, the pressure of pumps, compressors, blowers, engines, etc. changes around a certain value in a short cycle. Since it takes time for the diaphragm membrane (2) and the Bourdon tube type pressure gauge (6) to follow the pressure in such a pressure, the diaphragm and
And the Bourdon tube pressure gauge (6) does not follow the change. 4) The indicator needle (10) of the Bourdon tube pressure gauge (6) is central to the pressure that constantly changes in a short cycle such as in a pump, compressor, blower, engine, etc. It shows the average value in the static state without any change with respect to the pressure changing from the top to the bottom. Pump, compressor, blower, engine,
When the center of the pressure of the machine, that is, the average pressure, changes, the indicator needle (10) of the Bourdon tube pressure gauge (6) indicating the average value gently follows the average pressure of the machine. The present invention is a Bourdon tube pressure gauge (6) having the above-mentioned configuration and showing an average value of pressures that change in a short cycle.

[0005]

In the Bourdon tube type pressure gauge (6), the Bourdon tube (8) changes and deforms in proportion to the input pressure and the internal volume changes. Bourdon tube pressure gauge (6) and diaphragm membrane (2)
Are connected with a clean fill liquid (3), and a micro hole (5) for restricting the movement of the clean fill liquid (3) is provided in the passage. When the diaphragm membrane (2) receives the pressure of a machine such as a pump, a compressor, a blower, an engine, etc. where the pressure constantly changes rapidly in a short cycle, the diaphragm membrane (2) tries to change and deform according to the pressure received by the diaphragm (2). . The clean enclosed liquid (3) filled in the space of the diaphragm membrane (2) and the sealing liquid chamber (4) is pushed by the diaphragm membrane (2), and the cleaned enclosed liquid (3) moves to move to the Bourdon tube pressure. The pressure is transmitted to the gauge (6), but the fine filled liquid (3) flows into the Bourdon tube pressure gauge (6) through a minute hole (5) that restricts and delays the pressure transmission, and becomes a gentle moving flow. Since it is transmitted over a period of time, it does not change abruptly with respect to the machine pressure that changes abruptly in a short cycle. Due to the effect of the minute holes (5) for delaying the pressure transmission, the Bourdon tube pressure gauge (6) and the pressure indicating needle (10) gently follow the pressure of the mean value of the machine that changes rapidly in a short cycle, and the diaphragm ( 2) and Bourdon tube (8) change and deform

[0006]

【The invention's effect】

1) The Bourdon tube pressure gauge (6) does not change suddenly with respect to the machine pressure that changes rapidly in a short cycle, but gently follows the continuous average value of mechanical pressure that changes rapidly in a short cycle. Therefore, it is possible to easily read the pointer (10). 2) If an accident occurs in the Bourdon tube pressure gauge (6) and the Bourdon tube (8) is damaged, a clean filled liquid filled in the space between the diaphragm membrane (2) and the liquid sealing chamber (4). (3) leaks through the minute hole (5) to the damaged Bourdon tube (8), the clean liquid (3) filling the space in the liquid sealing chamber (4) is lost, and the diaphragm membrane (2) is lost. )
Is safe because it stops in contact with the liquid chamber (4) and the object whose pressure is measured does not leak. 3) Bourdon tube pressure gauge (6) If the amount of clean filled liquid (3) is determined within the range where the indication does not exceed the scale and the Bourdon tube pressure gauge (6) is damaged, the Bourdon tube pressure gauge (6) Even if a pressure greatly exceeding the scale of) is introduced into the diaphragm (2), the clean filled liquid (3) gently moves to the Bourdon tube pressure gauge (6), and the Bourdon tube pressure gauge (6) indicator needle The diaphragm (2) is stopped in a state where it is in contact with the liquid sealing chamber (4) when (10) is over the scale. If the pressure returns to normal, the Bourdon tube pressure gauge (6) will function normally. The pressure resistance of the Bourdon tube type pressure gauge (6) which indicates the average value, in which the amount of the enclosed liquid (3) is enclosed in a predetermined amount, is determined by the strength of the enclosed liquid chamber (4). 4) Bourdon tube pressure gauge (6) changes and deforms very slowly, so Bourdon tube (8) and gear (9)
A conversion gear (9) that converts the change of the Bourdon tube (8) into the movement of the indicator needle (10) because no impact force is applied to the
The conversion rate can be made large and the Bourdon tube (6) can also be used for the measured pressure.

[0007]

【effect】

1) Pressure gauges for machines such as pumps, compressors, blowers, engines, etc. where the pressure is constantly changing. For daily pressure monitoring, pressure average monitoring is more suitable than pressure variation monitoring, but pressure monitoring Can be used as a total. 2) The pressure of substances such as liquefied gas is low under normal conditions and high under abnormal conditions, which can be used as a pressure monitor. 3) Metal fatigue due to repeated stress of Bourdon tube, gears, etc. even if the pressure of machines such as pumps, compressors, blowers, engines, etc. that change rapidly around a certain pressure with a constant cycle is measured over a long period of time. Is less
Long life can be expected.

[Brief description of the drawings]

Figure 1: Bourdon tube pressure gauge diagram showing average values

[Explanation of symbols]

(1) Pressure introduction part that introduces measurement pressure (2) Diaphragm membrane that receives pressure (3) Clean filled liquid (4) Sealing chamber (5) Minute holes that delay pressure transmission (6) Bourdon tube type pressure Total (7) Stock (8) Bourdon tube (9) Gear that converts movement of Bourdon tube into movement of pressure indicator needle (10) Pressure indicator needle (11) Support point (12) Scale plate (13) Gasket (14) Tightening Attached bolt (15) Connecting rod that transmits the movement of the Bourdon tube to the gear

Claims (1)

[Claims] 1. A small hole diameter (0, 01 to 0) is provided in a passage connecting a sealed liquid chamber filled with a clean liquid and a Bourdon tube type pressure gauge.
(0, 4 mmΦ) by providing a fixed throttle that delays pressure transmission, for pressure that fluctuates rapidly in a short cycle,
A Bourdon tube pressure gauge that gives an average value by the effect of a throttle that delays the pressure transmission by setting a time for the pressure to be transmitted from the diaphragm that receives the pressure to the Bourdon tube pressure gauge.