JPS61218923A - Pressure measuring device - Google Patents

Abstract

PURPOSE:To measure a wind pressure accurately by providing a relatively thin pressure introducing body attached to a desired position of curved face and flat face and a pressure detecting section that determines the pressure of gas introduced from the pressure introducing body. CONSTITUTION:A pressure introducing body 1 is truck to a desired position where the wind pressure on the sail face is to be measured. In this case, the pressure introducing body 1 is stuck with a drip hole 5 positioned in the lower part. When the wind pressure is applied to each pressure introducing body, the pressure is sent to a pressure switching device 10 from a space 7 through pressure introducing tubes 11-1, 11-2, 11-3. The pressure switching device 10 sends the wind pressure to a pressure sensor 14 according to a switching signal from a switching signal generating circuit 13. Consequently, the wind pressure applied to a sail face can be determined accurately by the pressure sensor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a pressure measuring device for measuring wind pressure applied to a curved surface such as a sail surface of a sailing vessel and a flat surface.

[Technical background of the invention]

Sailing vessels (commercial vessels) are energy-saving vessels that have multiple sails installed on the vessel body, as shown in Figure 4, and propel themselves using the wind pressure applied to the sails. The angle is adjusted and propulsion is controlled. By the way, in order to carry out propulsion control with high precision, it is necessary to maintain the inside of the desk at a constant value depending on the wind direction, and this inside of the desk is determined by measuring the wind pressure (gas pressure) at each part of the sail surface. Previously, wind pressure measurements in 9 were carried out in a wind tunnel laboratory using artificial wind by creating model sails, but there are differences between the laboratory and the actual natural lee, so now sails are installed on ships. Often done.

Therefore, conventionally, wind pressure has been measured using the following method.

(1) Method of attaching a pressure sensor This method is a method of attaching a pressure sensor directly to the part of the sail where the wind pressure (pressure) is to be measured.

Since there are various types of pressure sensors that currently exist, there are two methods for this method: one is to form a hole perpendicular to the sail surface where the wind pressure is to be measured and embed the pressure sensor, and the other is to embed the pressure sensor in a hole perpendicular to the part of the sail surface where wind pressure is to be measured. It is classified into a method of pasting it on the surface. Here, in the method of embedding a pressure sensor, it is necessary to satisfy the following conditions. In other words, ■ There should be no problem even if a hole is made in the sail surface to be measured.

■ The structure must be thick enough to hide the pressure sensor. Alternatively, even if the pressure sensor protrudes, the protrusion should not affect the pressure being measured, such as when trying to measure the pressure on the outer surface of a cylinder and the protrusion occurs on the inner surface of the cylinder.

It is.

On the other hand, in the method of attaching a pressure sensor, the following conditions must be met. That is, although some protrusion from the sail surface occurs due to deterioration, this protrusion must be small enough not to affect the wind pressure to be measured.

(2) Method of providing a pressure hole In this method, a small hole, that is, a pressure hole, is provided in the sail to be measured, and the wind pressure applied to this pressure hole is guided through a pressure guide to a pressure sensor to measure the wind pressure. be.

Generally, with this method, a pressure switch can be used to select one of the pressure holes provided at multiple points and connect it to the pressure sensor, so one pressure sensor can measure the wind pressure at multiple points. It has the advantage of being measurable. Therefore, if a known reference pressure is included in one of the wind pressures at multiple points, it is easy to calibrate the measuring instrument at any time.

[Problems with background technology]

However, each of the above methods has the following problems in measuring the wind pressure on the sail surface. First, in the method of embedding a pressure senna, ■ The sail is owned by the customer and cannot be damaged in many cases, so it is extremely difficult to create a hole.

■ Since the sail surface is thin, making holes would pose a problem in terms of strength.

Furthermore, even if a hole is provided and a pressure sensor is embedded, the sail surface is thin and the pressure sensor may protrude from the hole, which may change the flow of wind (gas) on the sail surface.

There are other problems.

Next, in the method of attaching a pressure sensor, it is necessary to make the pressure sensor sufficiently small so as not to disturb the wind pressure on the sail surface, and to be able to measure minute pressures of about 0 to 501111H20 with high precision. However, at present, such a pressure sensor does not exist. - In addition to the problems of each of the above methods, the method of mounting the pressure sensor has the following problems. That is, since it takes a long time to measure the wind pressure at each location on the sail surface, a drift occurs in the measuring instrument system, which affects minute pressure measurements. Therefore, it is necessary to calibrate the measuring instrument system by applying a known reference pressure to each pressure sensor at appropriate intervals. However, when measuring wind pressure on a sail surface, the measurement point is at a high place, and it is almost impossible to freely load the reference pressure and the wind pressure to be measured to each pressure sensor without affecting each other.

Next, the method of providing pressure holes has the following problems. That is, since a pressure hole is provided and a pressure guiding chisel is connected, problems tend to occur in terms of the strength of the sail surface9, which is not suitable for practical use. Furthermore, since wind pressure measurements are carried out while sailing at sea, it is necessary to be able to accurately and stably measure wind pressure over a long period of time even in rainy weather or sea breezes. However, in reality, stable measurements were not possible due to the intrusion of rainwater into the pressure holes, clogging due to dew condensation, clogging due to salt clumps, etc.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its object is to provide a pressure measuring device that can perform stable measurements even under adverse conditions without disturbing the direction of gas pressure.

[Summary of the invention]

In the present invention, a pressure introduction body having a pressure introduction passage having a pressure introduction hole and a drainage passage for fluid flowing into the pressure introduction hole is attached to a curved surface such as a sail surface or a flat surface, and the pressure from this pressure introduction body is detected. This is a pressure measurement device that measures wind pressure.

[Embodiments of the invention]

As mentioned above, one embodiment of the pressure measuring device according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of the pressure measuring device. In the figure, reference numeral 1 denotes a pressure introducing body, which is attached to a desired position on the sail shown in FIG. 4 where wind pressure is to be measured. The specific structure is shown in Figure 2 (&) (b)
Explain with reference to. Note that FIG. 2(a) is a front view, and FIG. 2(b) is a sectional view taken along line A-A. This pressure introducing body 1 has a pressure introducing hole 4 and a drainage hole 5 formed on a circular substrate 2 for pasting through a Q-9 shaped intervening hole f*3. It has a structure in which the receiving plate 6 is fixed, and the intervening body 3 is hollow and thin. Therefore, a space 1 is formed inside the pressure introducing body 4.

The pressure introduction hole 4 is formed at a substantially central position of the pressure receiving plate 6, so that wind pressure is introduced to the pressure introduction path 8 through the space 1.

Further, the drain hole 5 is formed at a position opposite to the pressure introduction path 8 when viewed from the pressure introduction hole 4, that is, on the side in the self-falling direction of the fluid, so that the fluid entering from the pressure introduction hole 4 passes through the space 1 and passes through the drain hole 5. The water is drained from the water. Therefore, a drainage channel is formed by the space 7 and the drainage hole 5.

Furthermore, even if the amount of rainfall is large and the amount of water intruding from the pressure introduction hole 4 is greater than the amount of water drainage from the drainage hole 5, the space 7 has a capacity such that the surface of the water inundation does not reach the pressure introduction tube 9 for a certain period of time. The diameter of the pressure introduction hole 4 and the drainage hole 5 are
It is formed based on the size of the diameter and the maximum permissible amount of water infiltration.

The pressure introducing body 1 is a curved surface having various radii of curvature similar to the shape of a sail surface, so it is made of a material with excellent flexibility.

Now, this pressure introducing body 1 is connected to a pressure switching device 10 via a pressure introducing tube 9.

This pressure switching device 10 has pressure introduction bodies 1 affixed to desired wind pressure measurement positions on the sail surface, respectively.
11-x, xi-: 1, 11-3, and a reference pressure generating section 12 that generates a reference pressure for sheets is connected via a reference pressure switch 13.
In response to a switching signal from a switching signal generation circuit 13, each pressure introducing body 1'ft is switched and the wind pressure is sent to a pressure sensor 14. Although the switching signal generating circuit 13 automatically generates the switching signal, it may be configured to generate the switching signal manually.

Next, the operation of the apparatus having the above configuration will be explained.

First, the pressure introduction body 1 is attached to a desired location on the sail surface where the wind pressure is to be measured. In this case, the pressure introduction body 1 is attached so that the drainage hole 5 is located below. Therefore,
When wind pressure is applied to each pressure introduction body 1, the pressure is transferred from the space 7 to the pressure introduction tube 9 and the pressure introduction tube 11.
-1°11-2.1l-3t- and is sent to the pressure switching device 10. Then, in this pressure switch 10, the wind pressure from one pressure introduction #, 1 of each pressure introduction body 1 is sent to the pressure sensor 14 by a switching signal from a switching signal generation circuit 13. As a result, the pressure sensor 14 determines the wind pressure applied to the sail surface.

Note that in the above device, a pressure cell 140 calibration operation is also performed. That is, in response to a switching signal from the switching signal generation circuit 13, the pressure switching device 10 switches to the reference pressure from the reference pressure generation section 12 and sends it to the pressure sensor 14. Calibration is performed by adjusting whether the output signal of the pressure sensor 14 at this time is a predetermined value.

In this embodiment, the pressure introduction body 1, in which the pressure introduction passage having the pressure introduction hole 4 and the drainage passage having the drainage hole 5 are formed, is attached to the sail surface. In addition to being able to measure wind pressure without the need for a wind pressure inlet, the shape of the pressure introduction body 1 is thin and the circumference is shaped like a chi/4, so no matter what direction wind pressure (airflow) is applied, there will be no turbulence in the wind pressure on the sail surface or airflow. turbulence can be minimized and wind pressure can be measured accurately.

Furthermore, since the drainage hole 5 is provided, even if rainwater or the like floods through the pressure introduction hole 4, the rainwater is immediately drained, allowing stable wind pressure measurement at all times.

In particular, the drainage hole 5 is positioned on the same plane as the pressure introduction hole 4 so that the wind pressure in any direction does not affect the measurement, so it has no effect on the wind pressure measurement. and,
Even if the amount of water entering from the pressure introduction hole 4 becomes larger than the amount of water discharged, wind pressure measurement will not become impossible unless this state continues for a certain period of time or more. Note that the effect will be further enhanced if a material that repels water is used. Furthermore, since the calibration operation can be performed at any time, high measurement accuracy can be maintained for a long time.

Note that the present invention is not limited to the above embodiment. In the above embodiment, the drainage hole 5 is provided on the same plane as the pressure introduction hole 4, but if the direction of wind pressure is determined in advance, the fluid will naturally fall as shown in FIG. The drainage channel 20 may be formed in the direction according to the direction.

Although the device of the present invention has been applied to measuring wind pressure on a sail surface, it can also be applied to measuring wind pressure on a membrane structure without damaging general structures, such as wind pressure or rainfall conditions without disturbing airflow. Wind pressure can be measured accurately and stably even in extreme conditions.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a pressure measuring device that can perform stable measurements even under adverse conditions without disturbing the wind pressure direction.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the pressure measuring device according to the present invention, Fig. 2 (-) (b) is a specific structural diagram of the pressure introduction body of the device of the present invention, and Fig. 3 (,) (b) is a structural diagram showing a modified example of the pressure introducing body, and FIG. 4 is an external view of a sail of a sailing vessel. DESCRIPTION OF SYMBOLS 1... Pressure introduction body, 2... Substrate, 3... Tapered intermediate body, 4... Pressure introduction hole, 5... Drainage hole, 6...
・Pressure receiving plate, 7... Space part, 8... Pressure introduction path, 9
...Pressure introduction tube, 10...Pressure switch, 12
...Reference pressure generation section, 13...Switching signal generation circuit,
14... Pressure case/su. Applicant's agent Patent attorney Takehiko Suzue Figure 3 (a) (b)

Claims (1)

[Claims] In a pressure measuring device that measures gas pressure applied to a desired position on a curved surface and a flat surface, a pressure introduction path having a pressure introduction hole for the gas pressure and a drainage path for draining fluid flowing into the pressure introduction hole are formed, A pressure measuring device comprising: a relatively thin pressure introducing body attached to a desired position on a plane; and a pressure detecting section for determining the gas pressure guided from the pressure introducing body.