JPS6013929B2 - Seal performance measuring device for transferred objects during pipe transportation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the sealing performance of a transferred object in pipe transportation using a flow of fluid such as air in a pipe as a propulsion force.

In this type of so-called capsule transportation, the capsules running in the pipeline are equipped with rubber plates, elastic seal brushes, etc. to improve the sealing performance of the capsules in order to prevent leakage loss of the propulsion fluid.

However, the sealing performance differs from capsule to capsule, and this uneven sealing performance is caused by the capsule stop position control and
It is a variable factor in various controls such as speed control. Conventionally, sealing performance was not measured for each capsule or over time, making it impossible to obtain accurate sealing performance for each capsule, resulting in a reduction in various controllability.

This invention was proposed to address the above-mentioned conventional problems, and by measuring the relative velocity of the capsule and the flow in the pipe and the differential pressure before and after the capsule, it is possible to accurately determine the sealing performance of each capsule. The aim is to improve various controllability.

The measurement principle of this invention will be explained below. The sealing performance of a capsule can be expressed by the amount that leaks through the capsule when a certain pressure difference is applied across the capsule. If this is made dimensionless, it becomes the equation '1-', and the dimensionless number center represents the leakage rate. However, V: Relative velocity of the propelling fluid with respect to the capsule △Pc: Differential pressure before and after the capsule g: Gravitational acceleration y: Specific weight of the propelling fluid, that is, this leakage rate J is used as a characteristic value expressing the sealing performance of the capsule. be able to.

Furthermore, this small leakage rate is estimated from the flow at the orifice and is considered to be a constant value regardless of the magnitude of the differential pressure applied.

In fact, in experiments conducted under various sealing conditions, it has been confirmed that the leakage rate is not affected by the magnitude of the differential pressure applied. Figure 6 shows the leakage rate when the capsule is moving at a certain speed.
It can be seen that the value is almost the same as when it is stationary. From the above, the leakage rate of the capsule is determined by measuring the leakage rate under certain conditions, regardless of the size of the differential pressure or the capsule speed.
It can be seen that this value can be used for various controls as the sealing performance unique to the capsule.

Next, the present invention will be explained with reference to illustrated embodiments.
Reference numeral 1 denotes a capsule running in a conduit 3 receiving fluid pressure supplied from a fluid supply source 2 such as a blower, and measuring the differential pressure △Pc before and after the capsule and the relative velocity V of the propelling fluid with respect to the capsule, This is to find the leakage rate J of the capsule.

FIG. 2 shows a measurement method in which air is sent from the fluid supply source 2 to an extent that the capsule 1 does not move, and the leak rate peak is determined when the capsule is stationary.

Since the capsule velocity is 0, the relative velocity V is the velocity of the wind sent into the pipe line 3, and is measured by the current velocity meter (or flowmeter) 4. Differential pressure before and after capsule 1 is statically calculated △
Pc is measured using a known differential pressure gauge 5 such as a diaphragm strain gauge type. Furthermore, since the specific weight y changes depending on temperature and pressure, a pressure gauge 6 and a thermometer 7 are provided on the upstream side of the capsule 1 to measure the temperature t and pressure p at the time of measuring the leakage rate, and the specific weight y in this state is Use. '1 from these values
} Find the leakage rate center using the formula. In addition, when there are small fluctuations in temperature and pressure, the specific weight y can be roughly expressed as [Equation 2-2] using representative values in this system, and p to
．． ．．・Skin■y=Bottom・Reyo However, Suffix ○: Typical value For example, when the temperature changes by 10○○, the leakage rate center error is 2%, and when the pressure is 200k9', the error is about 1%. Therefore, the pressure gauge 6 and the thermometer 7 may be omitted.

FIG. 3 shows an example of online application in a capsule transportation system, which is a method for determining the leakage rate when the capsule 1 is at rest just before departure.

In the state before the capsule 1 departs, the on-off valves 8 and 9 are closed, and air from the fluid supply source 2 is sent to the pipe 3 through the flow meter 10, the branch pipe 11, and the flow rate adjustment valve 12, and the preceding capsule is Promote. Next, the on-off valves 8 and 9 are opened, and air is sent to the departure preparation pipe 3a via the branch pipe 11a. On this occasion,
The on-off valve 8 is adjusted so that the capsule in the departure preparation pipe 3a does not start moving. In such a state, the wind speed V
is measured by a current meter 4 provided in the branch pipe 11a, and the differential pressure ΔPc is measured by a differential pressure gauge 5 provided in the pipe line la. These measured values are calculated by the calculation unit 13 incorporating the formula (1).
is input, and the leakage rate is calculated. FIG. 4 shows the measurement of the leakage rate in the running state of the capsule 1, and the equation '1} becomes the following equation.

However, Va: Wind speed Vc: Capsule speed In this case, a detector 14 such as a photoelectronic switch is installed at a certain interval L in the differential pressure measurement section of the conduit 3, and the passage time Δt of the capsule 1 is measured, and Vc The signal is inputted to an arithmetic unit 15 incorporating 2L/Δt.

This gives the capsule velocity Vc. Further, the differential pressure ΔPc is measured by the differential pressure gauge 5, and the wind speed Va is measured by the current meter 4. Each measured value is input to the calculator 16 incorporating the formula (1)', and the leakage rate core is obtained.The leakage rate core measured in this way is the sealing performance specific to the capsule 1, and the capsule It is used as one of the characteristic values of 1 for various controls.

As described above, according to the present invention, by measuring the relative velocity of the propellant fluid to the transferred object and the differential pressure before and after the transferred object, accurate sealing performance can be determined for each transferred object, and various controllability can be improved. I can hope for it.

Furthermore, since measurements can be made online, no special time is required for measurements. Furthermore, since the measuring equipment used is a simple one that is produced in a standard manner, it has the advantage of being inexpensive and highly reliable.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the state of a capsule running in a pipeline, Figure 2 is a schematic diagram showing the measurement method of the present invention when the capsule is stationary, and Figure 3 is a diagram showing the state of the capsule before it departs. Figure 4 is a schematic diagram showing the measurement method when the capsule is running, Figure 5 is a graph of the experimental results showing the leakage rate when the capsule is stationary, and Figure 6 is a graph showing the measurement method when the capsule is stationary. ,
It is a graph showing the leakage rate during driving. 1...capsule, 2...fluid supply source, 3...
・Pipe line, 3a... Departure preparation pipe line, 4... Current velocity meter (flow meter), 5... Differential pressure gauge, 6... Pressure gauge, 7... ...Thermometer, 8,9...Open/close valve, 10...Flowmeter, 11,1 1a...
...Branch pipe, 12...Flow rate adjustment valve, 13...Arithmetic unit, 14...Detector, 15, 16...Arithmetic unit. 1st false figure 2 leopard 3 figure burning flies leopard 5 figure disaster 6 figure

Claims (1)

[Scope of Claims] 1. In a pipe transportation device that transports objects using the flow of fluid in a pipe as a propulsive force, the relative velocity V of the propelling fluid with respect to the object and the differential pressure ΔP before and after the object are measured during operation of the device. However, the leakage rate ψ as the sealing performance of the transported object is ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ However, g: gravitational acceleration γ: specific weight of the propelling fluid It is characterized by being configured to be measured online. Seal performance measuring device for transported objects.