Air flow measuring jig

Abstract

To provide an air flow measuring jig with which it is possible to accurately measure the flow rate of air irrespective of the shape and size of a blow port.SOLUTION: An air flow measuring jig comprises: a cylindrical body 20 having an insertion opening 22 on a side surface; and a hood 30 for guiding the air discharged from a blow port 103 to the cylindrical body 20. The hood 30 includes a hood body 31 formed from a deformable sheet material that does not pass air through, and a skeleton member 40 that holds the shape of the hood body 31, and the hood body 31 includes a first opening end 31a that is an opening end on the upstream side in the flow of air and a second opening end 31b that is an opening end on the downstream side in the flow of air. The skeleton member 40 includes a first skeleton member 50 located in shape of a frame along the first opening end 31a, and second skeleton members 60a, 60c that connect the first skeleton member 50 and the cylindrical body 20 together. The first skeleton member 50 has four sides, and each of the four sides has a stretchable structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an air flow measurement jig. [Background technology]

[0002] Patent Document 1 describes an air flow measurement hood. This air flow measurement hood includes an air flow measurement hood section and an air flow measurement portion that is detachable from the air flow measurement hood section. The air flow measurement hood section has a free-end side frame, a base side frame, and a sheet. The free-end side frame is foldable and has a free-end side opening. The base side frame is foldable and has a base side opening. The sheet is made of a flexible material. Both ends of the sheet are fixed to the free-end side frame and the base side frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-270005 Summary of the Invention [Problem to be solved by the invention]

[0004] When measuring the volume of air blown out from the air outlet, the air volume measurement hood is pressed against the ceiling so that the air outlet is surrounded by the free end opening. This causes the air blown out from the air outlet to be guided by the air volume measurement hood to the air volume measurement section, where the air volume is measured.

[0005] In order to accurately measure the volume of air blown out of the air outlet, the air outlet needs to be entirely enclosed by the free end opening of the air volume measurement hood. However, because air outlets come in a variety of shapes and sizes, it may be difficult to entirely enclose the air outlet with the free end opening depending on the shape or size of the air outlet. In this case, there is a problem in that it is difficult to accurately measure the volume of air.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an air flow measurement tool that can accurately measure air flow regardless of the shape and size of the air outlet. [Means for solving the problem]

[0007] The air flow measurement jig according to the present disclosure is an air flow measurement jig used to measure the air flow rate of air blown out from an air outlet, and comprises a cylindrical body having an insertion hole on its side through which an air speed sensor is inserted, and a hood attached to the cylindrical body and guiding the air blown out from the air outlet to the cylindrical body, the hood having a hood body formed from a deformable, airtight sheet material and a skeletal member that maintains the shape of the hood body, the hood body having a first opening end that is the upstream opening end in the air flow and a second opening end that is the downstream opening end in the air flow, the skeletal member having a first skeletal member arranged in a frame shape along the first opening end and a second skeletal member that connects the first skeletal member and the cylindrical body, the first skeletal member having four sides, each of which has an expandable structure. [Effects of the Invention]

[0008] According to the present disclosure, the air volume can be accurately measured regardless of the shape and size of the air outlet. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view showing a schematic configuration of an air flow measurement jig according to a first embodiment. [Figure 2] 1 is a top view showing a schematic configuration of an air flow measurement jig according to a first embodiment. [Figure 3] 3 is a top view showing a schematic configuration of a framework member in the air flow measurement jig according to the first embodiment. FIG. [Figure 4]10 is a top view showing a schematic configuration of the air flow measurement jig according to the first embodiment when the opening shape of the first opening end is changed. FIG. [Figure 5] 5 is a top view showing a schematic configuration of a framework member in the state shown in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 An air flow rate measuring jig according to embodiment 1 will be described. The air flow rate measuring jig of this embodiment is used to measure the air flow rate of air blown into a room from each outlet of a duct fan. Duct fans include duct air conditioners, duct ventilators, etc. The outlets of duct fans are installed on the ceiling, wall, floor, window frame, etc.

[0011] FIG. 1 is a side view showing a schematic configuration of an air flow measurement jig according to this embodiment. FIG. 1 shows the configuration of the air flow measurement jig when measuring air flow. In FIG. 1, an example of air flow is indicated by thick arrows. As shown in FIG. 1, a blowing unit 101 of a duct-type fan is installed on a ceiling 100. The blowing unit 101 is connected to a blowing unit (not shown) via a duct 102. The duct 102 is a round duct having a circular cross-sectional shape. Typically, a plurality of blowing units are connected to a blowing unit. The air blown from the blowing unit is distributed to each blowing unit via the duct.

[0012] The blow-out unit 101 is formed with a blow-out port 103. From the blow-out port 103, air blown from the blower unit is blown into the room.

[0013] The air flow measurement jig 10 includes a tubular body 20 and a hood 30. The tubular body 20 has, for example, a cylindrical or rectangular tubular shape. An air passage 21 is formed inside the tubular body 20, extending linearly along the axial direction of the tubular body 20. The air passage 21 penetrates the tubular body 20 from one end to the other.

[0014] The cylindrical body 20 has a plurality of insertion holes 22 on its side surface. Each insertion hole 22 penetrates to the air passage 21 inside the cylindrical body 20. In this embodiment, four insertion holes 22 are provided. The four insertion holes 22 are provided at 90° intervals along the circumferential direction of the cylindrical body 20. A probe 112 of a wind speed sensor 110, which will be described later, is inserted into each insertion hole 22. To prevent air from leaking from each insertion hole 22, each insertion hole 22 is closed by a slit-made rubber cap.

[0015] The cylindrical body 20 further has a handle 23 and a hook 24. The handle 23 is attached to the side of the cylindrical body 20. The handle 23 is formed so that the air flow measurement operator can hold it with one hand. The air flow measurement operator can support the cylindrical body 20 and the hood 30 by holding the handle 23.

[0016] The hook 24 is attached to the lower part of the side surface of the cylindrical body 20. The main body 111 of the wind speed sensor 110 is hung from the hook 24.

[0017] The hood 30 is detachably attached to the upper end of the cylindrical body 20. The hood 30 is configured to guide the air blown out from the air outlet 103 to the cylindrical body 20.

[0018] The hood 30 has a hood body 31 and a frame member 40. The hood body 31 is formed from a deformable, airtight sheet material. The hood body 31 may be formed from a flexible material that cannot maintain its three-dimensional shape. For example, the hood body 31 is formed from a cloth-like material.

[0019] The hood body 31 is formed in a cylindrical shape. The hood body 31 has a first open end 31a and a second open end 31b. The first open end 31a and the second open end 31b are each formed in the shape of a closed curve surrounding an opening through which air passes. The first open end 31a is the open end on the upstream side in the air flow during air volume measurement. The second open end 31b is the open end on the downstream side in the air flow during air volume measurement. The second open end 31b is connected to the cylindrical body 20. The circumferential length of the first open end 31a is longer than the circumferential length of the second open end 31b.

[0020] The wind speed sensor 110 has a main body 111, a probe 112, and a cable 113. The main body 111 has a display screen that displays the detection results, and a battery. A hanging string 114 is also attached to the main body 111. The hanging string 114 is hooked onto the hook 24, so that the main body 111 is supported by the cylindrical body 20.

[0021] Probe 112 is formed in a rod shape. When measuring air volume, probe 112 is inserted into one of the multiple insertion holes 22. Probe 112 is connected to main body 111 via cable 113.

[0022] Fig. 2 is a top view showing a schematic configuration of the air flow measurement jig according to this embodiment. Fig. 3 is a top view showing a schematic configuration of a skeletal member in the air flow measurement jig according to this embodiment. As shown in Figs. 2 and 3, the three-dimensional shape of hood body 31 is maintained by skeletal member 40. The opening shape of first opening end 31a is maintained as a square by skeletal member 40.

[0023] The skeletal member 40 has a first skeletal member 50 and a plurality of second skeletal members 60a, 60b, 60c, and 60d. The skeletal member 40 is configured to maintain the three-dimensional shape of the hood body 31. The skeletal member 40 is formed from a material that is lighter than metal, such as plastic.

[0024] The first skeletal member 50 is arranged in the shape of a rectangular frame. The first skeletal member 50 is arranged along the first opening end 31a of the hood body 31. For example, the hood body 31 has a plurality of through holes 32 formed along the first opening end 31a. The first skeletal member 50 is passed through the plurality of through holes 32. As a result, the first skeletal member 50 maintains the opening shape and opening size of the first opening end 31a.

[0025] The first skeleton member 50 has four sides 50a, 50b, 50c, and 50d and four corners 51a, 51b, 51c, and 51d. Corner 51a is formed between side 50a and side 50b. Corner 51b is formed between side 50b and side 50c. Corner 51c is formed between side 50c and side 50d. Corner 51d is formed between side 50d and side 50a.

[0026] The side portion 50a has a large diameter portion 50a1 and a small diameter portion 50a2. The large diameter portion 50a1 and the small diameter portion 50a2 are arranged coaxially with each other. One end of the large diameter portion 50a1 is connected to the corner portion 51d. The other end of the large diameter portion 50a1 is connected to one end of the small diameter portion 50a2. The other end of the small diameter portion 50a2 is connected to the corner portion 51a.

[0027] Both the large diameter portion 50a1 and the small diameter portion 50a2 are formed in a straight tube shape. The inner diameter of the large diameter portion 50a1 is larger than the outer diameter of the small diameter portion 50a2. The small diameter portion 50a2 is housed inside the large diameter portion 50a1 so as to be able to move back and forth freely. When the small diameter portion 50a2 is pulled out from the large diameter portion 50a1, the length of the side portion 50a increases. When the small diameter portion 50a2 is pushed into the large diameter portion 50a1, the length of the side portion 50a decreases. This gives the side portion 50a an expandable structure.

[0028] In this embodiment, the side portion 50a has a two-stage elastic structure consisting of a large diameter portion 50a1 and a small diameter portion 50a2. Therefore, the ratio of the longest length to the shortest length, i.e., the elasticity ratio, is about 2. To further increase the elasticity ratio of the side portion 50a, the side portion 50a may have a three-stage or more elastic structure.

[0029] The sides 50b, 50c, and 50d have the same structure as the side 50a. In this embodiment, the angles of the corners 51a, 51b, 51c, and 51d are fixed, so even if the sides 50a, 50b, 50c, and 50d expand or contract, the frame shape of the first framework member 50 remains rectangular. However, the angles of the corners 51a, 51b, 51c, and 51d may be variable.

[0030] The second skeletal members 60a, 60b, 60c, and 60d are configured to connect the first skeletal member 50 and the cylindrical body 20. The second skeletal members 60a, 60b, 60c, and 60d are all formed in a straight pipe shape.

[0031] One end of the second skeletal member 60a is connected to the corner 51a via a ball joint or the like (not shown). The other end of the second skeletal member 60a is connected to the cylindrical body 20 via a ball joint or the like (not shown). That is, the second skeletal member 60a is connected to both the corner 51a and the cylindrical body 20 so that its orientation can be changed. The second skeletal member 60a is connected to at least the cylindrical body 20 in a detachable manner.

[0032] Similarly, one end of the second skeletal member 60b is connected to the corner 51b via a ball joint or the like. The other end of the second skeletal member 60b is connected to the cylindrical body 20 via a ball joint or the like. One end of the second skeletal member 60c is connected to the corner 51c via a ball joint or the like. The other end of the second skeletal member 60c is connected to the cylindrical body 20 via a ball joint or the like. One end of the second skeletal member 60d is connected to the corner 51d via a ball joint or the like. The other end of the second skeletal member 60d is connected to the cylindrical body 20 via a ball joint or the like. The second skeletal members 60b, 60c, 60d are detachably connected to at least the cylindrical body 20.

[0033] Sides 50a, 50b, 50c, and 50d are extended or contracted by the air volume measurement operator in accordance with the shape and size of air outlet 103 to be measured. As a result, the opening shape and opening size of first opening end 31a are changed in accordance with the shape and size of air outlet 103 to be measured.

[0034] Fig. 4 is a top view showing a schematic configuration of the air flow measurement jig according to this embodiment when the opening shape of the first opening end is changed. Fig. 5 is a top view showing a schematic configuration of the framework member in the state shown in Fig. 4.

[0035] As shown in Figures 4 and 5, the opening shape of the first opening end 31a has been changed to a rectangular shape that is long in one direction. Compared to the state shown in Figure 3, the lengths of the sides 50a and 50c have been extended, and the lengths of the sides 50b and 50d have been shortened. Furthermore, compared to the state shown in Figure 3, the orientations of the second skeletal members 60a, 60b, 60c, and 60d have been adjusted.

[0036] The circumferential length of the first opening end 31a has been shortened by changing the opening shape of the first opening end 31a from a square to a rectangular shape. As a result, an excess portion that is not necessary for maintaining the three-dimensional shape of the hood body 31 is generated near the first opening end 31a of the hood body 31. For this reason, a pleat 33 is formed near the first opening end 31a of the hood body 31. The pleat 33 is a portion where the excess portion of the hood body 31 is gathered and folded over. The pleat 33 is formed in two or more dispersed locations in the circumferential direction of the first opening end 31a.

[0037] Next, an example of an air flow measurement method using the air flow measurement jig according to this embodiment will be described with reference to Fig. 1. First, the air flow measurement operator attaches the hood 30 to the cylindrical body 20 and assembles the air flow measurement jig 10. At this time, the air flow measurement operator adjusts the lengths of the side portions 50a, 50b, 50c, and 50d according to the shape and size of the air outlet 103 to be measured. As a result, the opening shape and opening size of the first opening end 31a are adjusted according to the shape and size of the air outlet 103 to be measured.

[0038] For example, when the shape of the air outlet 103 is square or circular, the opening shape and opening size of the first opening end 31a are adjusted to a square shape that surrounds the entire air outlet 103. When the shape of the air outlet 103 is a rectangle that is long in one direction, the opening shape and opening size of the first opening end 31a are adjusted to a rectangle that surrounds the entire air outlet 103.

[0039] Next, the air flow measurement worker grasps the handle 23 with one hand and lifts up the cylindrical body 20 and the hood 30. This allows the cylindrical body 20 and the hood 30 to be supported by one hand of the air flow measurement worker. The air flow measurement worker then presses the hood 30 against the ceiling 100 so that the first open end 31a of the hood 30 completely surrounds the air outlet 103.

[0040] Next, the air flow measurement operator hangs main body 111 of air velocity sensor 110 from hook 24 and holds probe 112 with the other hand. As a result, main body 111 of air velocity sensor 110 is held by one hand of the air flow measurement operator, and probe 112 is held by the other hand of the air flow measurement operator. Therefore, in this embodiment, air flow measurement jig 10 and air velocity sensor 110 can be held by a single air flow measurement operator.

[0041] The airflow measurement operator sequentially inserts probes 112 into the multiple insertion holes 22 and measures the air speed at multiple measurement points in air passage 21. The air volume of air blown out from air outlet 103 is calculated based on, for example, the average value of the air speeds at the multiple measurement points and the cross-sectional area of ​​air passage 21.

[0042] When the air flow measurement is completed, the air flow measurement operator moves the hood 30 away from the ceiling 100 and disassembles the air flow measurement jig 10 into the cylindrical body 20 and the hood 30. In this embodiment, since the air flow measurement jig 10 can be disassembled into the cylindrical body 20 and the hood 30, the air flow measurement jig 10 can be easily carried around.

[0043] In the disassembled hood 30, the lengths of the sides 50a, 50b, 50c, and 50d of the first skeletal member 50 are adjusted to be as short as possible. Each of the second skeletal members 60a, 60b, 60c, and 60d is folded into the same plane as the first skeletal member 50 by a ball joint or the like. This makes the disassembled hood 30 smaller and flatter, making it easier to carry.

[0044] As described above, the air flow measurement jig 10 according to this embodiment is used to measure the air flow rate of air blown out from the air outlet 103. The air flow measurement jig 10 comprises a cylindrical body 20 and a hood 30. The cylindrical body 20 has an insertion hole 22 on its side. The probe 112 of the air velocity sensor 110 is inserted into the insertion hole 22. The hood 30 is attached to the cylindrical body 20. The hood 30 is configured to guide the air blown out from the air outlet 103 to the cylindrical body 20.

[0045] The hood 30 has a hood body 31 and a skeletal member 40. The hood body 31 is formed from a deformable, airtight sheet material. The skeletal member 40 is configured to maintain the shape of the hood body 31. The hood body 31 has a first opening end 31a and a second opening end 31b. The first opening end 31a is the opening end on the upstream side in the air flow. The second opening end 31b is the opening end on the downstream side in the air flow.

[0046] The skeleton member 40 has a first skeleton member 50 and second skeleton members 60a, 60b, 60c, and 60d. The first skeleton member 50 is arranged in a frame shape along the first opening end 31a. The second skeleton members 60a, 60b, 60c, and 60d connect the first skeleton member 50 and the cylindrical body 20. The first skeleton member 50 has four sides 50a, 50b, 50c, and 50d. Each of the four sides 50a, 50b, 50c, and 50d has an expandable structure.

[0047] According to this configuration, the opening shape and opening size of first open end 31a can be changed according to the shape and size of air outlet 103. Therefore, regardless of the shape and size of air outlet 103, first open end 31a can surround the entire air outlet 103. Therefore, regardless of the shape and size of air outlet 103, the air volume can be accurately measured.

[0048] In the air flow measurement jig 10 according to this embodiment, the hood 30 is detachably attached to the cylindrical body 20 .

[0049] According to this configuration, the air flow measurement jig 10 can be disassembled into the cylindrical body 20 and the hood 30, making the air flow measurement jig 10 easy to carry.

[0050] In the air flow measurement jig 10 according to this embodiment, the insertion hole 22 is a plurality of insertion holes 22. The plurality of insertion holes 22 are arranged in the circumferential direction of the cylindrical body 20.

[0051] According to this configuration, the wind speed can be measured at a plurality of measurement points spaced apart from one another in the circumferential direction of the cylindrical body 20, so that the air volume can be measured more accurately.

[0052] In the air flow measurement jig 10 according to this embodiment, a handle 23 is attached to the side surface of the cylindrical body 20.

[0053] According to this configuration, the cylindrical body 20 can be easily carried around.

[0054] In this embodiment, the configuration in which the air outlet 103 is installed on the ceiling 100 has been taken as an example, but the present invention is not limited to this. The air flow rate measuring jig of this embodiment can also be used to measure the air flow rate from an air outlet installed on a wall, floor, window frame, etc. [Explanation of symbols]

[0055] 10 air flow measurement jig, 20 cylindrical body, 21 air passage, 22 insertion hole, 23 handle, 24 hook, 30 hood, 31 hood main body, 31a first opening end, 31b second opening end, 32 through hole, 33 pleat portion, 40 skeletal member, 50 first skeletal member, 50a, 50b, 50c, 50d side portion, 50a1 large diameter portion, 50a2 small diameter portion, 51a, 51b, 51c, 51d corner portion, 60a, 60b, 60c, 60d second skeletal member, 100 ceiling, 101 blowing unit, 102 duct, 103 blowing outlet, 110 air speed sensor, 111 main body, 112 probe, 113 cable, 114 hanging cord.

Claims

1. An air flow rate measuring tool used to measure the air flow rate of air blown out from an air outlet, a cylindrical body having an insertion hole on a side surface into which the wind speed sensor is inserted; a hood attached to the cylindrical body and guiding air blown out from the air outlet to the cylindrical body; Equipped with The hood is a hood body formed of a deformable, airtight sheet material; a skeletal member that maintains the shape of the hood body, The hood body includes: a first open end that is an open end on the upstream side in the air flow; a second open end that is an open end on the downstream side in the air flow, The skeletal member is a first framework member disposed in a frame shape along the first opening end; a second skeletal member connecting the first skeletal member and the cylindrical body, the first skeletal member has four sides, Each of the four sides of the air flow measurement jig has an expandable structure.

2. The air flow measurement tool according to claim 1 , wherein the hood is detachably attached to the cylindrical body.

3. the insertion hole is a plurality of insertion holes, The air flow measurement jig according to claim 1 or 2, wherein the plurality of insertion holes are arranged in a circumferential direction of the cylindrical body.

4. 3. The air flow measurement tool according to claim 1, wherein a handle is attached to a side surface of the cylindrical body.

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