JP7764259B2 - Connecting Devices - Google Patents

Description

The present invention relates to a connection device used in wind tunnel experiments using a wind tunnel experiment model.

Conventionally, it has been known to conduct wind tunnel tests using wind tunnel test models of buildings in order to evaluate in advance the wind forces acting on the exterior walls and roofs of buildings whose construction is planned (see, for example, Patent Document 1).
A wind tunnel test model is formed with multiple wind pressure measurement holes, for example, several tens to approximately 1,000 wind pressure measurement points. Each measurement hole can be formed when forming the building's exterior using a 3D printer or other three-dimensional modeling device, or can be installed by forming it in advance on the acrylic panel or other part that forms the building's exterior. A pressure guide tap made of a thin metal pipe is connected to each measurement hole. The wind pressure at the multiple wind pressure measurement holes is extracted to the outside of the wind tunnel test model via a pressure guide tube connected to each pressure guide tap.

JP 2019-178870 A

Each wind pressure measurement hole formed on the outer surface of the wind tunnel test model is given a measurement number (measurement point number) and name for identifying it. Similarly, each pressure guide tube extending to the outside of the wind tunnel test model is also labeled with the corresponding measurement number and name. When connecting the pressure guide tubes to the wind pressure sensor equipment, the pressure guide tubes are connected one by one to the connecting members of the wind pressure sensor equipment while checking the labels. This has resulted in a problem of requiring a great deal of time and effort to connect the pressure guide tubes, as well as the time and effort required to check for connection errors.
The present invention aims to solve the above-mentioned problems and to provide a connection device that can reduce connection errors while shortening the time required to connect a wind tunnel test model having multiple wind pressure measurement holes to a wind pressure sensor device.

To solve the above problem, the present invention provides a connection device for connecting a wind tunnel test model having a plurality of wind pressure measurement holes and a plurality of wind pressure output holes communicating with the plurality of wind pressure measurement holes to a wind pressure sensor device. The connection device includes a base attached to the locations where the plurality of wind pressure output holes are formed, a plurality of connection tubes supported by the base and connectable to the plurality of wind pressure output holes, a plurality of pressure guiding tubes connected to the plurality of connection tubes and guiding wind pressure transmitted to the plurality of connection tubes toward the wind pressure sensor device, and a connecting member connected to the ends of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device . A mounting flange protruding laterally from the periphery of the base is formed.
In the present invention, the base, multiple connection tubes, multiple pressure guide tubes, and connecting member can be permanently assembled into an integrated unit. This allows the wind tunnel test model and wind pressure sensor equipment to be uniformly connected via the connecting device during wind tunnel testing, eliminating the need for the conventional, cumbersome task of connecting each pressure guide tube to the wind pressure measurement hole or connecting member while checking the labels bearing the measurement numbers and names. This shortens the connection time to the wind pressure sensor equipment and reduces connection errors.

It is also preferable that the plurality of connection tubes are connected to the plurality of wind pressure extraction holes via a sealing material.
By configuring it in this way, the sealing performance between the wind pressure extraction hole and the connecting tube can be improved, making it possible to perform wind tunnel experiments with high accuracy.

Preferably, the base is provided with a positioning means for positioning the base at a location where the plurality of wind pressure extraction holes are formed.
This configuration allows multiple connection tubes to be correctly connected to multiple wind pressure extraction holes, reliably preventing connection errors. Also, it makes it easier to connect the connection tubes to each wind pressure extraction hole, thereby reducing the connection time.

To solve the above problems, the present invention provides a connection device for connecting a wind tunnel test model having a plurality of wind pressure measurement holes and a plurality of wind pressure output holes communicating with the plurality of wind pressure measurement holes to a wind pressure sensor device. The connection device includes a base attached to the location where the plurality of wind pressure output holes are formed, a plurality of connection tubes supported by the base and connectable to the plurality of wind pressure output holes, a plurality of pressure guiding tubes connected to the plurality of connection tubes and guiding wind pressure transmitted to the plurality of connection tubes toward the wind pressure sensor device, and a connecting member connected to the ends of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device. The connection device also includes an attachment/detachment means for attaching and detaching the base to the location where the plurality of wind pressure output holes are formed . The attachment /detachment means includes a plurality of bolt insertion holes formed through the base, base attachment bolts that are inserted into the plurality of bolt insertion holes and screwed into the areas where the plurality of wind pressure extraction holes are formed, and removal female threads that are formed on the inner surfaces of the plurality of bolt insertion holes and do not interfere with the base attachment bolts . The attachment/detachment means also includes a seat plate that is inserted between the base and the areas where the plurality of wind pressure extraction holes are formed and is positioned so as to close the openings of the plurality of bolt insertion holes, and base removal bolts that have an outer diameter larger than that of the base attachment bolts and can be screwed into the removal female threads .
With this configuration, the base can be attached to and detached from the area where the multiple wind pressure extraction holes are formed using the attachment/detachment means. When attaching the base, base attachment bolts are inserted into the multiple bolt insertion holes and screwed into the area where the multiple wind pressure extraction holes are formed. On the other hand, when removing the base, each base attachment bolt is removed, and a seat plate is inserted between the base and the area where the multiple wind pressure extraction holes are formed to close the openings of the multiple bolt insertion holes. Then, base removal bolts are inserted into the multiple bolt insertion holes and screwed into the female threads, and each base removal bolt is evenly tightened. Then, the tightening pressure of each base removal bolt acts on the seat plate, and the reaction force from this tightening pressure pulls the base approximately parallel to the area where the multiple wind pressure extraction holes are formed. This results in a connection device with excellent repeatability (reusability) for attachment and detachment.

The connection device of the present invention can shorten the time required to connect wind pressure sensor equipment to a wind tunnel test model with multiple wind pressure measurement holes, while reducing connection errors.

1 is a schematic diagram showing an overview of a wind tunnel testing device using a connection device according to a first embodiment of the present invention. 1 is a partial cross-sectional explanatory view showing a state in which a connection device according to a first embodiment of the present invention is connected to a wind tunnel test model. FIG. FIG. 2 is a partial cross-sectional explanatory view showing a state in which the connection device according to the first embodiment of the present invention is removed from the wind tunnel test model. FIG. 2 is a plan view showing a base body of the connection device according to the first embodiment of the present invention. FIG. 2 is a front view showing the base of the connection device according to the first embodiment of the present invention. FIG. 1 is a partial cross-sectional explanatory view showing an example of a connection in a conventional wind tunnel experiment. FIG. 1 is a partial cross-sectional explanatory view showing an example of a connection in a conventional wind tunnel experiment. FIG. 10 is a plan view showing a base body of a connection device according to a second embodiment of the present invention. FIG. 10 is a partial cross-sectional explanatory view showing a state in which a connection device according to a third embodiment of the present invention is connected to a wind tunnel test model. FIG. 11 is a partial cross-sectional explanatory view showing the base body of a connection device according to a third embodiment of the present invention and the lower part of a wind tunnel test model. FIG. 11 is a partial cross-sectional explanatory view showing the operation when the base body of the connection device according to the third embodiment of the present invention is removed from the wind tunnel test model. FIG. 11 is a partial cross-sectional explanatory view showing the operation when the base body of the connection device according to the third embodiment of the present invention is removed from the wind tunnel test model. FIG. 11 is a partial cross-sectional explanatory view showing a state in which the base body of the connection device according to the third embodiment of the present invention has been removed from the wind tunnel test model.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In the following embodiments, identical parts will be designated by the same reference numerals, and duplicated explanations will be omitted. Fig. 1 is a schematic diagram showing an overview of a wind tunnel testing apparatus using a connection device according to a first embodiment of the present invention, Fig. 2A is a partial cross-sectional explanatory view showing the connection device according to the first embodiment of the present invention connected to a wind tunnel testing model, and Fig. 2B is a partial cross-sectional explanatory view showing the connection device removed from the wind tunnel testing model.
(First embodiment)
The connection device 10 of this embodiment is applied to a wind tunnel testing device 100 as shown in FIG. 1 , and is a device attached to a wind tunnel testing model 70 installed in a wind tunnel 101. An artificial wind flow is created in the wind tunnel 101 by a blower (not shown). A Pitot tube P is installed in the wind tunnel 101 as a measuring device for measuring the speed of the wind flow. The total pressure and static pressure measured by the Pitot tube P are input to a downstream differential pressure meter (manometer) 110 via a pressure guiding tube P1. The differential pressure meter 110 measures the wind speed based on the pressure difference between the input total pressure and static pressure.

The connection device 10 includes a base body 20, a plurality of connection tubes 30 attached to the base body 20, pressure guiding tubes 40 connected to each connection tube 30, and connection members 50 connected to the ends of each pressure guiding tube 40. The base body 20 is formed of a metal material, for example, an aluminum alloy. As shown in FIG. 2A , the base body 20 is attached to the underside 75 of the lower portion 71 of the wind tunnel test model 70.
3A and 3B, the left-right direction of the base 20 is referred to as the X-axis direction, the front-rear direction as the Y-axis direction, and the up-down direction as the Z-axis direction. The X-axis and Y-axis directions are horizontal directions parallel to the floor of the experimental facility where the wind tunnel experimental device 100 is installed, and the Z-axis direction is vertical, perpendicular to the floor of the experimental facility.
As shown in FIG. 3A , the base body 20 has a substantially rectangular shape in plan view. The base body 20 also has a predetermined thickness in the Z-axis direction so that it can stably hold each connection tube 30 in an upright position (see FIG. 3B ). As shown in FIGS. 2A and 3B , the base body 20 has a plurality of mounting holes 22 formed therethrough in the Z-axis direction to support the connection tubes 30. As shown in FIG. 3A , the mounting holes 22 are arranged in a linear array in the X-axis and Y-axis directions (25 columns x 25 columns), effectively utilizing the rectangular shape of the base body 20. Among the mounting holes 22, the distance between the mounting holes 22 aligned in the Y-axis direction at the right end of the base body 20 and the adjacent mounting hole 22 to the left of it is wider than the distance between adjacent mounting holes 22 at other positions.

Each connection tube 30 is formed of a metal material, such as iron or stainless steel. Each connection tube 30 has, for example, an inner diameter of 1.0 mm and an outer diameter of 1.5 mm. Each connection tube 30 passes through a mounting hole 22 and is attached to the base 20 with its upper and lower portions protruding from the base 20. The upper portion of each connection tube 30 functions as an insertion portion inserted into the wind pressure extraction hole 74 of the wind tunnel test model 70, and the lower portion of each connection tube 30 functions as a connection portion to which the pressure guide tube 40 is connected. Note that FIGS. 2A and 2B schematically illustrate the mounting holes 22 and connection tubes 30 and do not correspond to the number and arrangement of the mounting holes 22 in FIGS. 3A and 3B. The number and arrangement of the connection tubes 30 (25 rows x 25 columns) shown in FIG. 3A are an example design. As shown in FIG. 2B , each mounting hole 22 is formed at a position corresponding to a wind pressure extraction hole 74 formed in the underside 75 of the lower portion 71 of the wind tunnel test model 70, and has an outer diameter smaller than the inner diameter of the wind pressure extraction hole 74. As a result, as shown in FIG. 2A , by attaching the base 20 to the underside 75 of the wind tunnel test model 70, each connection tube 30 is inserted into the corresponding wind pressure extraction hole 74. An O-ring 23 is attached to the base portion of the upper portion of each connection tube 30 as a sealing member (see FIG. 2B ). As shown in FIG. 2A , by attaching the base 20 to the underside 75 of the wind tunnel test model 70, each O-ring 23 seals the gap between the underside 75 of the wind tunnel test model 70 and the upper surface of the base 20 around the connection tube 30. It should be noted that other sealing materials may be used instead of the O-ring 23.
The wind tunnel test model 70 is formed with a plurality of wind pressure measurement holes 72 opening on the outer surface of the model, and pressure guide paths 73 that communicate with each of the wind pressure measurement holes 72 and have the other end opening as wind pressure extraction holes 74.

As shown in FIG. 3A , a plurality of mounting flanges 21 are formed around the periphery of the base body 20, protruding laterally from the base body 20. A bolt insertion hole 24 is formed in each mounting flange 21. A bolt (not shown) for fixing the base body 20 to the underside 75 of the wind tunnel test model 70 is inserted into the bolt insertion hole 24. Threading holes (not shown) for the bolts inserted through the bolt insertion holes 24 are formed in the underside 75 of the wind tunnel test model 70. Of the mounting flanges 21, three mounting flanges 21c, 21b, and 21c are arranged at the left end of the base body 20 in the X-axis direction, and one mounting flange 21b is arranged at the opposite right end. In other words, the number of mounting flanges 21 differs between the left end and the right end. At the left end, the mounting flange 21b is located in the center in the Y-axis direction, and the remaining mounting flanges 21c, 21c are located at the front and rear ends in the Y-axis direction. At the right end, the mounting flange 21b is located in the center in the Y-axis direction.
Meanwhile, two mounting flanges 21a, 21d are disposed at both the front end and rear end in the Y-axis direction of the base body 20. The mounting flange 21a is located in the center in the X-axis direction, and the mounting flange 21d is located at the right end in the X-axis direction. In other words, no mounting flanges 21 are disposed at the left ends of the front and rear ends.
This layout of the mounting flange portion 21 and the layout of the mounting holes 22 with the different pitch intervals described above provide a configuration for mounting the base 20 in the correct position on the underside 75 of the wind tunnel test model 70, i.e., a positioning means for ensuring that the connecting tubes 30 are correctly connected to each wind pressure extraction hole 74.

Each pressure guiding tube 40 is made of a resin material, such as vinyl resin. For example, each pressure guiding tube 40 has an inner diameter of 1 mm and an outer diameter of 2.3 mm. One end of each pressure guiding tube 40 is connected to the lower part of the connecting tube 30, and the other end is connected to the terminal portion 51 of the connecting member 50. This function guides the wind pressure transmitted to each connecting tube 30 to a downstream wind pressure sensor device (not shown; the same applies below). The connection portions between each pressure guiding tube 40 and the connecting tube 30, and between each pressure guiding tube 40 and the terminal portion 51, are secured by, for example, a wire wrapping or adhesive, ensuring a permanent connection. This reduces the risk of the pressure guiding tube 40 becoming detached accidentally when attaching the base body 20 to the wind tunnel test model 70.

The connecting member 50 is an adapter for connecting to the sensor terminal (not shown) of the wind pressure sensor device, and is equipped with terminals 51 to which each pressure guide tube 40 can be connected. The connecting member 50 is attached to the sensor terminal of the wind pressure sensor device with mounting screws or the like. The entire path from each wind pressure measurement hole 72 to the pressure guide path 73, wind pressure extraction hole 74, connection tube 30, pressure guide tube 40, and terminal 51 is assigned a measurement number (measurement point number) and name to identify the wind pressure measurement hole 72. Attaching the connecting member 50 to the sensor terminal of the wind pressure sensor device is pre-set so that the wind pressure corresponding to the measurement number (measurement point number) and name can be recognized.

A method of using the connection device 10 described above will now be described.
First, the upper surface of the base 20 is brought close to the underside 75 of the wind tunnel test model 70, and the orientation of the base 20 is adjusted so that the position of the mounting flange 21 of the base 20 corresponds to the position of the bolt holes on the underside of the wind tunnel test model 70. Thereafter, the base 20 is brought even closer to the underside 75 of the wind tunnel test model 70, and the tip ends of each connecting tube 30 of the base 20 are aligned and inserted into each wind pressure extraction hole 74 of the wind tunnel test model 70. Thereafter, the base 20 is gradually lifted up until the upper surface of the base 20 is in tight contact with the underside 75 of the wind tunnel test model 70.
In this state, bolts (not shown) are inserted into the bolt insertion holes 24 of each mounting flange portion 21 of the base body 20, and each bolt is screwed into the bolt insertion hole 24. As a result, the connection device 10 is attached to the wind tunnel test model 70 with the connection tubes 30 properly connected to each wind pressure extraction hole 74 of the wind tunnel test model 70.
The connecting member 50 is then attached to the terminal of the wind pressure sensor device and fixed in place with mounting screws, etc. As a result, the wind tunnel test model 70 and the wind pressure sensor device can be connected via the integrally constructed connecting device 10 so that wind pressure can be measured.

4A and 4B show an example of a connection used in a conventional wind tunnel experiment as a comparative example.
The connection example shown in Figure 4A is for a conventional wind tunnel test model 70A that only forms the outer shape of a building. The inside of the wind tunnel test model 70A is a substantially hollow space that provides space for arranging pressure lead taps 76 connected to each wind pressure measurement hole 72 and pressure lead tubes 45 that are directly connected to each pressure lead tap 76. The ends of each pressure lead tube 45 are connected to connecting members 50.
During wind tunnel testing, pressure guiding tubes 45, each having a measurement number (measurement point number) or name attached to a label or the like, are connected one by one to each pressure guiding tap 76, and then, while checking the labels, the pressure guiding tubes 45 are connected one by one to the terminal portions 51 of the connecting member 50. For this reason, in this connection example, the work of connecting the pressure guiding tubes 45 required a great deal of time and effort, and also time and effort were required to check for connection errors to the connecting member 50.

4B is for a conventional wind tunnel test model 70B in which the entire building is solid. Openings 78 of pressure guide paths 73 that communicate with each wind pressure measurement hole 72 are formed on the underside 77 of wind tunnel test model 70B. Connecting pipes 35 are connected to each opening 78, and pressure guide tubes 45 are connected to each connecting pipe 35. The ends of each pressure guide tube 45 are connected to connecting members 50.
During a wind tunnel experiment, connecting pipes 35 are attached to each opening 78 of the wind tunnel experiment model 70B, and pressure guiding tubes 45, each having a measurement number (measurement point number) or name on a label, are connected to each connecting pipe 35 one by one. Thereafter, while checking the labels, the pressure guiding tubes 45 are connected one by one to the terminal portions 51 of the connecting members 50. For this reason, even in this connection example, the work of connecting the pressure guiding tubes 45 required a great deal of time and effort, and additional time and effort was required to check for connection errors to the connecting members 50.

In contrast, the connection device 10 of this embodiment allows the base 20, multiple connection tubes 30, multiple pressure guiding tubes 40, and connection member 50 to be configured as a permanently assembled, integrated unit. This allows for a uniform connection between the wind tunnel experiment model 70 and the wind pressure sensor equipment via the connection device 10 during wind tunnel experiments. This eliminates the need for the conventional, cumbersome task of connecting each pressure guiding tube 45 to the connection member 50 while checking the labels bearing the measurement numbers and names. This reduces the time required to connect to the wind pressure sensor equipment and reduces connection errors.

In addition, each connecting tube 30 is connected to the wind pressure extraction hole 74 via an O-ring 23, which improves the sealing between the wind pressure extraction hole 74 and the connecting tube 30, enabling highly accurate wind tunnel experiments.

Furthermore, the positioning means described above allows the connection tubes 30 to be correctly connected to each wind pressure extraction hole 74 on the base 20, reliably preventing connection errors. It also makes it easier to connect the connection tubes 30 to each wind pressure extraction hole 74, shortening the connection time.

Second Embodiment
A connection device according to a second embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 is a plan view showing the base of the connection device according to the second embodiment of the present invention.
5, the base body 20A has a substantially square shape in a plan view. Although not shown, the base body 20A also has a predetermined thickness in the Z-axis direction so as to stably hold each connection tube 30 in an upright position, similar to the first embodiment. The mounting flange portion is omitted.
In this embodiment, the mounting holes 22 are formed concentrically, and the connection tubes 30 are arranged concentrically.
A pin 25A is erected on the top surface of the base body 20A near one corner. The pin 25A functions as a positioning device and can be inserted into a pin insertion hole (not shown) provided at a corresponding position on the underside 75 of the wind tunnel test model 70. By performing positioning using the pin 25A in this manner, the connection tube 30 can be correctly connected to each wind pressure extraction hole 74 (see FIG. 2A ). This reliably prevents connection errors even when the connection tube 30 is concentric. Furthermore, this makes it easier to connect the connection tube 30 to each wind pressure extraction hole 74, thereby reducing the connection time.
It should be noted that instead of the pin 25A, a connecting tube 30 may be provided and used as a positioning means.

This embodiment also achieves the same effects as those described in the first embodiment. That is, during wind tunnel testing, the wind tunnel test model 70 and wind pressure sensor equipment can be uniformly connected via the connection device 10. This eliminates the need for the conventional, cumbersome task of connecting each pressure-guiding tube 45 to the connecting pipe 35 and connecting member 50 while checking the labels bearing the measurement numbers and names. This reduces the time required to connect to the wind pressure sensor equipment and reduces connection errors.

(Third embodiment)
A connection device according to a third embodiment of the present invention will be described with reference to Figures 6 to 7D. Figure 6 is a partial cross-sectional view showing the state in which the connection device according to the third embodiment of the present invention is connected to a wind tunnel test model. Figure 7A is a partial cross-sectional view showing the base body of the connection device according to the third embodiment of the present invention and the lower part of the wind tunnel test model. Figures 7B and 7C are partial cross-sectional views showing the operation of removing the base body of the connection device from the wind tunnel test model. Figure 7D is a partial cross-sectional view showing the state in which the base body of the connection device has been removed from the wind tunnel test model.
As shown in FIGS. 6 and 7A, the connection device 10A of this embodiment includes an attachment/detachment means 60 for attaching and detaching the base body 20B to and from the wind tunnel test model 70C.
The attachment/detachment means 60 includes a plurality of bolt insertion holes 61, a bolt 62 for attaching the base body, a female threaded portion 63 for detachment (see Figure 7A), a seat plate 64 (see Figure 7B), and a bolt 65 for detaching the base body (see Figure 7B).

The plurality of bolt insertion holes 61 are provided on the outer periphery of the base body 20B and penetrate in the Z-axis direction (vertical direction). Figures 6 and 7A show, as an example, two bolt insertion holes 61 formed at the left and right ends of the base body 20B in the X-axis direction (horizontal direction). Note that the plurality of bolt insertion holes 61 may be provided at appropriate positions according to the shape of the base body 20B, or may be provided using the mounting flange portion 21 (see Figure 3A) as described in the first embodiment.
When attaching the base 20B to the wind tunnel test model 70C, base attachment bolts 62 are inserted through the bolt insertion holes 61, and when removing the base 20B from the wind tunnel test model 70C, base removal bolts 65 are inserted through the bolt insertion holes 61. The base attachment bolts 62 have a total length that passes through the base 20B and is threaded into nuts 7b (described below) that are disposed in the lower portion 71C of the wind tunnel test model 70C. In this embodiment, for example, M8 bolts with washers having an outer diameter larger than that of the bolt insertion holes 61 are used as the base attachment bolts 62. Note that it is also possible to use washers instead of washers and use M8 bolts without washers.
The female threaded portion 63 for removal is formed on the inner surface of each bolt insertion hole 61, and has an inner diameter that does not interfere with the base mounting bolt 62, i.e., an inner diameter that is smaller than the outer diameter of the base mounting bolt 62. In this embodiment, the maximum inner diameter of the female threaded portion 63 for removal is set to, for example, 8.5 mm.
A plurality of model-side through-holes 7a are formed through the lower portion 71C of the wind tunnel test model 70C at positions corresponding to the plurality of bolt insertion holes 61. A recess 7c is formed at the upper opening of each model-side through-hole 7a. A nut 7b is fitted into each recess 7c, into which a base body mounting bolt 62 is threaded. Meanwhile, a seat plate arrangement space 7d, which is recessed upward, is formed at the lower opening of each model-side through-hole 7a. The size of the seat plate arrangement space 7d in the Z-axis direction is set to, for example, 3.0 mm.

The seat plate 64 shown in FIG. 7 has a flat plate shape that can be placed in the seat plate placement space 7d. The seat plate 64 is inserted into the seat plate placement space 7d when the base body 20B is removed and serves to close the upper openings of the bolt insertion holes 61 (the lower openings of the model insertion holes 7a). In this embodiment, for example, a seat plate 64 with a thickness of 2.3 mm is used. Note that the seat plate placement space 7d is formed on the underside 75C of the wind tunnel test model 70C, but this is not limited thereto. It may also be formed on the upper side of the base body 20B, or it may be formed on both the underside 75C of the wind tunnel test model 70C and the upper side of the base body 20B. A washer (not shown) may be inserted into the seat plate placement space 7d as needed.
As shown in FIG. 7B , the base removal bolts 65 are used when removing the base 20B. The base removal bolts 65 have an outer diameter that can be threaded into the removal female threads 63. That is, the outer diameter of the base removal bolts 65 is larger than the outer diameter of the base attachment bolts 62. In this embodiment, M10 bolts, for example, are used as the base removal bolts 65. When removing the base 20B from the underside 75C of the wind tunnel test model 70C, the base removal bolts 65 are threaded into the removal female threads 63 and act to apply tightening pressure from below to the seat plate 66 disposed in the seat plate arrangement space 54. The reaction force from this tightening pressure acts to separate the base 20B from the underside 75C of the wind tunnel test model 70C.
The overall length of the base removal bolt 65 is set so that when tightened by screwing, it projects greater than the amount of projection of each connection tube 30 projecting upward from the top surface of the base 20B.

Next, a procedure for attaching and detaching the base body 20B of the connection device 10A using the attachment/detachment means 60 will be described. Prior to attaching the base body 20B, a sealant for sealing the gap between the underside 75C of the wind tunnel test model 70C and the top surface of the base body 20B is applied, for example, to the top surface of the base body 20B (around the rising portion of the connection tube 30). Any material can be used as the sealant as long as it prevents pressure leakage from the connection between the two, and various materials can be used, such as caulking, adhesive, gel-like material, grease, etc.
When attaching the base body 20B, the upper surface of the base body 20B is brought close to the underside 75C of the wind tunnel test model 70C, and the position of the base body 20B is adjusted so that the positions of the bolt insertion holes 61 of the base body 20B correspond to the positions of the model-side insertion holes 7a of the wind tunnel test model 70C. The base body 20B is then brought even closer to the underside 75C of the wind tunnel test model 70C, and the tips of the connection tubes 30 of the base body 20B are aligned and inserted into the wind pressure extraction holes 74 of the wind tunnel test model 70C. The base body 20B is then gradually lifted before the sealing material dries or solidifies, so that the upper surface of the base body 20B is tightly attached to the underside 75C of the wind tunnel test model 70C. The base body attachment bolts 62 are then inserted into the bolt insertion holes 61 of the base body 20B, and then threaded into the nuts 7b through the model-side insertion holes 7a. As a result, the connection device 10A is attached to the wind tunnel test model 70C with the connection tubes 30 properly connected to the wind pressure extraction holes 74 of the wind tunnel test model 70C. If necessary, a washer (not shown) may be placed in the seat plate arrangement space 7d.

When removing the base body 20B, the base body mounting bolts 62 are unscrewed and removed from the bolt insertion holes 61. If a washer is inserted in the seat plate arrangement space 7d, the washer is then removed. Then, as shown in FIG. 7B , a seat plate 64 is inserted into the seat plate arrangement space 7d to close the upper openings of the bolt insertion holes 61 (the lower openings of the model-side insertion holes 7a). Then, a base removal bolt 65 is inserted into each bolt insertion hole 61 and threaded into the removal female thread 63.
As a result, the tip of each base removal bolt 65 abuts against the underside of each seat plate 64, and tightening pressure acts on each seat plate 64. When each base removal bolt 65 is further tightened evenly, the reaction force from the tightening pressure pulls the base 20B away from the underside 75C of the wind tunnel test model 70C in a substantially parallel position, as shown in Figure 7C. In other words, when each base removal bolt 65 is tightened while maintaining the tightening amount of each base removal bolt 65 (the length of the base removal bolt 65 protruding from the bolt insertion hole 61) evenly, the base 20B can be pulled away vertically downward while maintaining the parallelism of the base 20B with respect to the underside 75C of the wind tunnel test model 70C. This makes it less likely that a removal situation that could occur without the attachment/detachment means 60, such as a situation in which the base 20B is pulled strongly by hand during removal, causing the parallelism to exceed a certain tolerance and placing a load on the connection tube 30, thereby preventing bending or breakage of the connection tube 30. Furthermore, by further tightening each base removal bolt 65 evenly, the base 20B can be removed from the underside 75C of the wind tunnel test model 70C, as shown in FIG. 7D . Evenly tightening each base removal bolt 65 allows the base 20B to be easily removed against the adhesive force, even if the base 20B is firmly adhered to the underside 75C of the wind tunnel test model 70C with a sealant.

This embodiment also provides the same effects as those described in the first embodiment. Additionally, since the attachment/detachment means 60 is provided, when removing the base body 20B, the base body 20B can be detached while maintaining parallelism with the underside 75C of the wind tunnel test model 70C and adjusting the amount of detachment from the underside 75C. This prevents bending or damage to the connection tube 30, which may occur when removing the base body 20B, and provides a connection device 10A with excellent repeatability (reusability) for attachment and detachment. Furthermore, since the O-ring 23 (see FIG. 2B) described in the first embodiment is not required, the installation of the base body 20B is simplified.
The outer diameter of the base mounting bolt 62, the inner diameter of the female threaded portion 63, and the outer diameter of the base removal bolt 65 can be set appropriately within a range that allows the mounting/removal means 60 to achieve its desired effect.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and each component can be appropriately modified within the scope of the invention.
For example, if there are fewer wind pressure measurement holes 72 than the number of connecting tubes 30 provided on the bases 20, 20A, and 20B, dummy wind pressure extraction holes 74 that are not related to measurement can be formed on the underside of the wind tunnel test model 70 so that all of the connecting tubes 30 can be inserted.
Conversely, if there are more wind pressure measurement holes 72 than the number of connecting tubes 30 provided on the bases 20, 20A, 20B, the wind tunnel test model 70 can be configured so that multiple bases 20, 20A, 20B can be attached to the underside of the model.
Furthermore, the number and arrangement of the mounting holes 22 (connection tubes 30) provided in the bases 20, 20A, 20B, and the spacing between adjacent mounting holes 22 (connection tubes 30) can be set as appropriate.

Furthermore, although the bases 20, 20A, and 20B are shown to have a rectangular shape in plan view, this is not limited thereto, and various shapes such as a circle, an ellipse, a triangle, or a polygon can be used.
In addition, multiple bases 20, 20A, 20B may be connected to one connecting member 50 via a pressure-guiding tube 40, or a single base 20, 20A, 20B may be connected to multiple connecting members 50 via a pressure-guiding tube 40.
In the third embodiment, the nut 7b is fixed to the lower portion 71C of the wind tunnel test model 70C, and the base mounting bolt 62 is screwed onto the nut 7b. However, this is not limited to this, and a female thread may be formed on the inner surface of the model-side through-hole 7a, and the base mounting bolt 62 may be screwed onto the female thread.
In addition, in the third embodiment, a sealant is applied to the lower surface 75C of the wind tunnel test model 70C and the upper surface of the base body 20B. However, instead of applying a sealant, other seal members such as an O-ring 23 (see FIG. 2B) may be used.

10 Connection device 20, 20A Base body 21 Mounting flange portion (positioning means)
21a to 21d: Mounting flange portion 22: Mounting hole 23: O-ring (sealing member)
24 Bolt insertion hole (positioning means)
25A Pin (positioning means)
30 Connection tube 40 Pressure guide tube 50 Connection member 60 Attachment/detachment means 61 Bolt insertion hole 62 Bolt for attaching base body 63 Female thread portion 64 Seat plate 65 Bolt for removing base body 70, 70C Wind tunnel test model 72 Wind pressure measurement hole 74 Wind pressure extraction hole 100 Wind tunnel test device

Claims (4)

A connection device for connecting a wind tunnel test model having a plurality of wind pressure measurement holes and a plurality of wind pressure output holes communicating with the plurality of wind pressure measurement holes to a wind pressure sensor device,
a base attached to a portion where the plurality of wind pressure extraction holes are formed;
a plurality of connection tubes supported on the base and connectable to the plurality of wind pressure extraction holes;
a plurality of pressure guiding tubes connected to the plurality of connection tubes and guiding the wind pressure transmitted to the plurality of connection tubes toward the wind pressure sensor device;
a connecting member connected to an end of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device;
A connection device characterized in that a mounting flange portion protruding laterally from the periphery of the base body is formed on the periphery of the base body . The connection device described in claim 1, characterized in that the multiple connection tubes are connected to the multiple wind pressure extraction holes via sealing material. A connection device as described in claim 1 or claim 2, characterized in that the base is provided with positioning means for positioning the base at the location where the multiple wind pressure extraction holes are formed. A connection device for connecting a wind tunnel test model having a plurality of wind pressure measurement holes and a plurality of wind pressure output holes communicating with the plurality of wind pressure measurement holes to a wind pressure sensor device,
a base attached to a portion where the plurality of wind pressure extraction holes are formed;
a plurality of connection tubes supported on the base and connectable to the plurality of wind pressure extraction holes;
a plurality of pressure guiding tubes connected to the plurality of connection tubes and guiding the wind pressure transmitted to the plurality of connection tubes toward the wind pressure sensor device;
a connecting member connected to an end of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device;
a detachment means for attaching and detaching the base to and from a portion where the plurality of wind pressure extraction holes are formed,
The attachment/detachment means is
a plurality of bolt insertion holes formed through the base;
a base mounting bolt that is inserted into each of the plurality of bolt insertion holes and screwed into a portion where the plurality of wind pressure extraction holes are formed;
a female thread portion for removal formed on the inner surface of the plurality of bolt insertion holes and not interfering with the base mounting bolts;
a seat plate inserted between the base body and a portion where the plurality of wind pressure extraction holes are formed, and disposed in a state of closing the openings of the plurality of bolt insertion holes;
a base removal bolt having an outer diameter larger than that of the base attachment bolt and capable of being threaded into the removal female thread portion, said connection device comprising: