Connecting Devices

Abstract

To propose a connection device that can reduce connection errors while shortening a connection time of a wind tunnel test model having a plurality of wind pressure measurement holes to a wind pressure sensor apparatus.SOLUTION: A connection device 10 is for connecting a wind tunnel test model 70 formed with a plurality of wind pressure measurement holes 72 and a plurality of wind pressure extraction holes 74 communicating with the plurality of wind pressure measurement holes 72, to a wind pressure sensor apparatus. The connection device 10 includes: a base body 20 attached to a portion where the plurality of wind pressure extraction holes 74 are formed; a plurality of connection tubes 30 that are supported by the base body 20 and can be connected to the plurality of wind pressure extraction holes 74; a plurality of pressure guide tubes 40 that are connected to the plurality of connection tubes 30, and guide wind pressure transmitted to the plurality of connection tubes 30 toward the wind pressure sensor apparatus; and a connection member 50 that is connected to ends of the plurality of pressure guide tubes 40 and can be connected to the wind pressure sensor apparatus.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to a connection device used in a wind tunnel experiment using a wind tunnel experiment model. [Background technology]

[0002] Conventionally, it is 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 has multiple wind pressure measurement holes, for example, several tens to a thousand wind pressure measurement holes. Each measurement hole can be formed when forming the building's exterior using a 3D printer or other 3D modeling device, or it can be installed by forming it in advance on the acrylic panel or other part that forms the building's exterior. Each measurement hole is connected to a pressure guide tap made of a thin metal pipe. The wind pressure at the multiple wind pressure measurement holes is extracted to the outside of the wind tunnel test model via pressure guide tubes connected to each pressure guide tap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-178870 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, 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 leading out of the wind tunnel test model is also given a label with the corresponding measurement number and name, and when connecting the pressure guide tubes to the wind pressure sensor equipment, the pressure guide tubes are connected one by one to the wind pressure sensor equipment's connecting members while checking these labels. As a result, connecting the pressure guide tubes requires a great deal of time and effort, and there is also the problem of 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. [Means for solving the problem]

[0005] In order 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 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 connection members connected to ends of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device. A mounting flange portion is formed on the periphery of the base body, protruding laterally from the base body. In the present invention, the base, multiple connection tubes, multiple pressure guiding 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 guiding tube to the wind pressure measurement hole or connecting member while checking the labels bearing the measurement numbers and names. This shortens the time required to connect the tubes to the wind pressure sensor equipment and reduces connection errors.

[0006] 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.

[0007] 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.

[0008] In order 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 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 connection members connected to ends of the plurality of pressure guiding tubes and connectable to the wind pressure sensor device. The base body is provided with an attachment / detachment means for attaching and detaching the base body to and from the area where the plurality of wind pressure extraction holes are formed. . before The attachment / detachment means includes a plurality of bolt insertion holes formed through the base body, base attachment bolts that are inserted into the plurality of bolt insertion holes and screwed into the locations where the plurality of wind pressure extraction holes are formed, and female threaded portions for removal that are formed on the inner surfaces of the plurality of bolt insertion holes and do not interfere with the base attachment bolts. do. The attachment / detachment means includes a seat plate that is inserted between the base and the portion where the plurality of wind pressure extraction holes are formed and that is disposed in a state of blocking the openings of the plurality of bolt insertion holes, and a base removal bolt that has an outer diameter larger than that of the base attachment bolt and can be screwed into the removal female thread portion. do. 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 tightened evenly. 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. [Effects of the Invention]

[0009] The connection device according to the present invention can reduce connection errors while shortening the time required to connect a wind pressure sensor device to a wind tunnel test model having multiple wind pressure measurement holes. [Brief explanation of the drawings]

[0010] [Figure 1] 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. [Figure 2A] 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. [Figure 2B] 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 removed from a wind tunnel test model. [Figure 3A] 1 is a plan view showing a base body of a connection device according to a first embodiment of the present invention. [Figure 3B] 1 is a front view showing a base body of a connection device according to a first embodiment of the present invention. [Figure 4A] FIG. 1 is a partial cross-sectional explanatory view showing an example of a connection in a conventional wind tunnel experiment. [Figure 4B] FIG. 1 is a partial cross-sectional explanatory view showing an example of a connection in a conventional wind tunnel experiment. [Figure 5] FIG. 10 is a plan view showing a base body of a connection device according to a second embodiment of the present invention. [Figure 6] 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. [Figure 7A] FIG. 10 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. [Figure 7B] FIG. 10 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. [Figure 7C] FIG. 10 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. [Figure 7D] FIG. 10 is a partial cross-sectional explanatory view showing a state in which the base body of a connection device according to a third embodiment of the present invention has been removed from a wind tunnel test model. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In the following embodiments, identical parts are 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 same 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 differential pressure meter (manometer) 110 in the subsequent stage via a pressure guiding pipe P1. The differential pressure meter 110 measures the wind speed based on the pressure difference between the input total pressure and static pressure.

[0012] 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 a lower portion 71 of a wind tunnel test model 70. 3A and 3B, for convenience of explanation, the left-right direction of base body 20 is defined 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 or the like on which wind tunnel experimental apparatus 100 is installed, and the Z-axis direction is vertical direction perpendicular to the floor of the experimental facility or the like. As shown in FIG. 3A, the base body 20 has a substantially rectangular shape in plan view. The base body 20 has a predetermined thickness in the Z-axis direction so that it can stably hold each connection tube 30 in an upright state (see FIG. 3B). As shown in FIGS. 2A and 3B, a plurality of mounting holes 22 for supporting the connection tubes 30 are formed through the base body 20 in the Z-axis direction. 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 hole 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 on the left and right at other positions.

[0013] 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 to be 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. Thus, 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 has a plurality of wind pressure measurement holes 72 that open 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.

[0014] 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. The underside 75 of the wind tunnel test model 70 is formed with threaded holes (not shown) for the bolts inserted through the bolt insertion holes 24. 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, 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, 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. Mounting flange 21a is located in the center in the X-axis direction, and 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 different pitch intervals as 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.

[0015] 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 connection tube 30, and the other end is connected to the terminal portion 51 of the connection member 50. The pressure guiding tube 40 functions to guide the wind pressure transmitted to each connection 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 connection tube 30, and between each pressure guiding tube 40 and the terminal portion 51, are fixed by, for example, a wire wound or adhesive, thereby achieving a permanent connection. This reduces the risk of the pressure guiding tube 40 becoming detached accidentally when, for example, attaching the base body 20 to the wind tunnel test model 70.

[0016] The connecting member 50 is an adapter for connecting to a sensor terminal (not shown) provided on the wind pressure sensor device, and has terminals 51 to which each pressure guiding 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. Note that the series of paths from each wind pressure measurement hole 72 to the pressure guiding path 73, wind pressure extraction hole 74, connection tube 30, pressure guiding tube 40, and terminals 51 are assigned measurement numbers (measurement point numbers) and names to identify the wind pressure measurement holes 72, and are set in advance so that by attaching the connecting member 50 to the sensor terminal of the wind pressure sensor device, it is possible to recognize that the wind pressure corresponds to the measurement number (measurement point number) and name.

[0017] A method of using the connection device 10 described above will now be described. First, the upper surface of base 20 is brought close to underside 75 of wind tunnel test model 70, and the orientation of base 20 is adjusted so that the position of mounting flange 21 of base 20 corresponds to the position of the bolt holes on the underside of wind tunnel test model 70. Then, base 20 is brought even closer to underside 75 of wind tunnel test model 70, and the tips of each connecting tube 30 of base 20 are aligned and inserted into each wind pressure extraction hole 74 of wind tunnel test model 70. Then, base 20 is gradually lifted up until the upper surface of base 20 is in tight contact with underside 75 of 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. Thereafter, the connection member 50 is attached to the terminal portion 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 connection device 10 so that wind pressure can be measured.

[0018] 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 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 it also required time and effort to check for connection errors to the connecting member 50.

[0019] 4B is for a conventional wind tunnel test model 70B in which the entire building is formed as a solid structure. Opening holes 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 hole 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 hole 78 of 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, and then, while checking the labels, the pressure guiding tubes 45 are connected one by one to the terminal parts 51 of the connecting member 50. Therefore, 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 member 50.

[0020] In contrast, the connection device 10 of this embodiment can be configured as an integrated unit in which the base 20, the multiple connection tubes 30, the multiple pressure guiding tubes 40, and the connection member 50 are permanently assembled. As a result, during wind tunnel testing, the wind tunnel test model 70 and the 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 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.

[0021] Furthermore, since each connection tube 30 is connected to the wind pressure output hole 74 via an O-ring 23, the sealing performance between the wind pressure output hole 74 and the connection tube 30 can be improved, enabling wind tunnel experiments to be performed with high accuracy.

[0022] Furthermore, the above-described positioning means on the base 20 allows the connection tubes 30 to be correctly connected to each wind pressure extraction hole 74, reliably preventing connection errors. Also, it becomes easier to connect the connection tubes 30 to each wind pressure extraction hole 74, reducing the connection time.

[0023] (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 state, 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 near one corner of the upper surface of the base body 20A. The pin 25A functions as a positioning means 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), and even when the connection tube 30 is concentric, connection errors can be reliably prevented. 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 connection tube 30 may be provided and used as a positioning means.

[0024] This embodiment also provides the same effects as those described in the first embodiment. That is, during wind tunnel testing, the wind tunnel test model 70 and the 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 the 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.

[0025] (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 explanatory 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, and Figure 7A is a partial cross-sectional explanatory 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 similar partial cross-sectional explanatory views showing the operation when the base body of the connection device is removed from the wind tunnel test model, and Figure 7D is similarly a partial cross-sectional explanatory 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 thread portion 63 for removal (see Figure 7A), a seat plate 64 (see Figure 7B), and a bolt 65 for removing the base body (see Figure 7B).

[0026] A 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 a 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 by utilizing 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 on the lower portion 71C of the wind tunnel test model 70C. In this embodiment, for example, M8 bolts with washers attached, each with a washer 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 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.

[0027] 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 a member that is inserted into the seat plate placement space 7d when the base body 20B is removed, and serves to close the upper openings of each bolt insertion hole 61 (the lower openings of each model-side insertion hole 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 across 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 bolt 65 is used when removing the base 20B. The base removal bolt 65 has an outer diameter that can be threaded into the removal female thread portion 63. That is, the outer diameter of the base removal bolt 65 is larger than the outer diameter of the base attachment bolt 62. In this embodiment, an M10 bolt is used as the base removal bolt 65. When removing the base 20B from the underside 75C of the wind tunnel test model 70C, the base removal bolt 65 is threaded into the removal female thread portion 63 and acts to apply tightening pressure from below to the seat plate 66 arranged 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 bolt 65 for removing the base body is set so that when tightened by screwing, it projects out more than the amount of projection of each connection tube 30 projecting upward from the top surface of the base body 20B.

[0028] 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 20B, the upper surface of the base 20B is brought close to the underside 75C of the wind tunnel test model 70C, and the position of the base 20B is adjusted so that the positions of the bolt insertion holes 61 of the base 20B correspond to the positions of the model-side insertion holes 7a of the wind tunnel test model 70C. The base 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 20B are aligned and inserted into the wind pressure extraction holes 74 of the wind tunnel test model 70C. The base 20B is then gradually lifted before the sealing material dries or hardens, so that the upper surface of the base 20B is tightly attached to the underside 75C of the wind tunnel test model 70C. The base attachment bolts 62 are then inserted into the bolt insertion holes 61 of the base 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.

[0029] 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 body removal bolt 65 abuts against the underside of each seat plate 64, and tightening pressure acts on each seat plate 64. When each base body removal bolt 65 is further tightened evenly, the reaction force from the tightening pressure pulls the base body 20B away from the underside 75C of the wind tunnel test model 70C in a substantially parallel position, as shown in Fig. 7C. In other words, when each base body removal bolt 65 is tightened while keeping the tightening amount of each base body removal bolt 65 (the length of the base body removal bolt 65 protruding from the bolt insertion hole 61) even, the base body 20B can be pulled away vertically downward while maintaining the parallelism of the base body 20B with respect to the underside 75C of the wind tunnel test model 70C. This reduces the likelihood of 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. This prevents bending or damage to 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 from the underside 75C of the wind tunnel test model 70C, even if the base 20B is firmly bonded to the underside 75C of the wind tunnel test model 70C with a sealant.

[0030] 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 distance 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 attachment 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.

[0031] 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 present 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 connection 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.

[0032] Furthermore, although the bases 20, 20A, and 20B are shown to have a rectangular shape in plan view, the present invention is not limited to this and various shapes such as a circle, an ellipse, a triangle, or a polygon can be used. Furthermore, multiple bases 20, 20A, 20B may be connected to one connection member 50 via pressure guiding tubes 40, or a single base 20, 20A, 20B may be connected to multiple connection members 50 via pressure guiding tubes 40. In addition, 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 insertion 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, but instead of applying a sealant, other seal members such as an O-ring 23 (see Figure 2B) may be used. [Explanation of symbols]

[0033] 10 Connecting Devices 20,20A base 21 Mounting flange (positioning means) 21a~21d Mounting flange 22 mounting holes 23 O-ring (sealing material) 24 Bolt insertion hole (positioning means) 25A pin (positioning means) 30 Connecting Tube 40 Pressure Tube 50 Connecting member 60 Attachment / detachment means 61 Bolt insertion hole 62 Bolt for mounting the base 63 Female thread 64 Seat board 65 Bolt for removing base 70,70C Wind tunnel test model 72 Wind pressure measurement hole 74 Wind pressure extraction hole 100 Wind tunnel testing equipment

Claims

1. 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.

2. 2. The connection device according to claim 1, wherein the plurality of connection tubes are connected to the plurality of wind pressure extraction holes via a sealing material.

3. 3. The connection device according to claim 1, wherein 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.

4. A connection device for connecting a wind tunnel experiment model having a plurality of wind pressure measurement holes and a plurality of wind pressure extraction 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:

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