Clothing fan

Abstract

To provide a clothing fan which can improve a blow capacity while suppressing an increase in an axial direction of a housing.SOLUTION: A clothing fan 1 includes: a hollow housing 2 having an air inlet 11 and an air outlet 21 facing the air inlet 11; and a fan body 3 arranged inside the housing 2. The housing 2 has: a first case 10 having a cylindrical first cylinder part 12 in which the air inlet 11 is formed at one end part; and a second case 20 having a cylindrical second cylinder part 22 in which the air outlet 21 is formed at one end part and into which the first cylinder part 12 is inserted. The fan body 3 has a plurality of blades 37 for sending air from the air inlet 11 to the air outlet 21 by being rotated by an electric motor 34. When a direction in which the air inlet 11 and the air outlet 21 face each other is an axial direction X, a position of an opening edge 21a of the air outlet 21 in the axial direction X is set within a predefined range A with a blade chord-side downstream end part 38d of the blade 37 as reference.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a clothing fan. [Background technology]

[0002] Conventionally, clothing fans are known that are attached to clothing with an outlet inserted into an opening formed in the clothing to blow air (outside air) into the interior of the clothing (see, for example, Patent Documents 1 and 2). Conventional clothing fans include a hollow housing with a fan body disposed therein. The housing has a cylindrical first case with an inlet formed therein and a cylindrical second case with an outlet formed opposite the inlet and into which the first case is inserted. The clothing fan is attached to clothing by sandwiching the clothing between the first case and the second case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-115685 [Patent Document 2] Japanese Patent Publication No. 2022-27428 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, in a clothes fan, the shorter the axial distance between the housing and the fan body, the higher the pressure inside the housing, causing pressure loss when air is introduced through the inlet, resulting in a decrease in the volume of air discharged from the outlet. Therefore, increasing the axial length of the housing and ensuring a large axial distance between the housing and the fan body increases the volume of air discharged from the clothes fan and improves its airflow capacity.

[0005] However, because clothing fans are attached to clothing when used, the longer the axial length of the housing, the more it protrudes inside or outside the clothing, increasing the chances of it coming into contact with the wearer's body or interfering with the wearer's work. Therefore, it is preferable for the axial length of the housing of a clothing fan to be short.

[0006] The present invention has been made in light of the above-mentioned problems, and aims to provide a clothes fan that can improve air-blowing capacity while suppressing an increase in the axial dimension of the housing. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a clothing fan that is attached to clothing and blows air into the clothing, comprising: a hollow housing having an inlet and an outlet facing the inlet; and a fan body disposed inside the housing. The housing has a first case having a cylindrical first tubular section with the inlet formed at one end thereof; and a second case having a cylindrical second tubular section having the outlet formed at one end thereof and into which the first tubular section is inserted. The fan body has a plurality of blades that are rotated by an electric motor to blow air from the inlet to the outlet. When the direction in which the inlet and the outlet face each other is defined as the axial direction, the axial position of the opening edge of the outlet is set within a predetermined range based on the downstream end of the blade on the chord side. [Effects of the Invention]

[0008] As a result, the clothing fan of the present invention can improve its air-blowing capacity while suppressing an increase in the axial dimension of the housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing clothing to which the clothing fan of Example 1 is attached. FIG. [Figure 2] FIG. 1 is an exploded perspective view showing a clothing fan according to a first embodiment. [Figure 3] FIG. 1 is a plan view of the clothing fan of the first embodiment, viewed from the air inlet side. [Figure 4] FIG. 1 is a plan view of the clothing fan of the first embodiment, viewed from the outlet side. [Figure 5] FIG. 1 is a side view of a clothing fan according to a first embodiment. [Figure 6] 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 7] FIG. 2 is a perspective view of the first case of the first embodiment as seen from inside the housing. [Figure 8] FIG. 2 is a perspective view of the second case of the first embodiment as seen from outside the housing. [Figure 9] FIG. 2 is a perspective view showing a blade member of the first embodiment. [Figure 10] FIG. 2 is a plan view of the blade member of the first embodiment as viewed from the air inlet side. [Figure 11] FIG. 2 is a side view of the blade member of the first embodiment. [Figure 12] 4 is a cross-sectional view of FIG. 3 taken along line B-B. [Figure 13] 1 is a table showing pressure distribution around a blade. [Figure 14A] FIG. 2 is a cross-sectional view showing the main configuration of the first prototype clothing fan. [Figure 14B] FIG. 10 is a cross-sectional view showing the main configuration of the second prototype clothing fan. [Figure 14C] FIG. 10 is a cross-sectional view showing the main configuration of the third prototype clothing fan. [Figure 15] 10 is a graph showing the relationship between the distance from the downstream end on the chord side to the opening edge of the discharge port and the simulated air volume. [Figure 16] 10 is a graph showing the relationship between the distance from the downstream end on the chord side to the opening edge of the discharge port and the actually measured air volume. [Figure 17] 4 is a graph showing the measured airflow rates of the clothing fan of Example 1 and the clothing fan of the comparative example. [Figure 18] FIG. 10 is a cross-sectional view showing a clothing fan according to a second embodiment. [Figure 19] FIG. 10 is a side view showing a first case of the second embodiment. [Figure 20]19A is a cross-sectional view taken along the line CC in FIG. [Figure 21] FIG. 10 is a cross-sectional view showing a second case of the second embodiment, with blade members omitted. [Figure 22] FIG. 10 is a plan view of the second case of the second embodiment as viewed from the suction port side. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clothing fan according to a first embodiment of the present invention will be described with reference to a first embodiment and a second embodiment shown in the drawings.

[0011] Example 1 The clothing fan 1 of the first embodiment is detachably attached to clothing 100, such as a jacket (jacket) worn by a wearer on the upper body. The clothing fan 1 sends air (outside air) into the clothing 100 to cool the wearer's body.

[0012] As shown in FIG. 1 , the garment 100 has a pair of openings 102 formed in a back piece 101 that covers the wearer's back, for example. The openings 102 are circular through-holes that penetrate the back piece 101. Meanwhile, the garment fan 1 of Example 1 has a first case 10 that is inserted into the openings 102 from the outside of the garment 100, and a second case 20 that is placed inside the garment 100, as will be described later. The garment fan 1 is attached to the garment 100 by sandwiching the peripheral area of ​​the openings in the back piece 101 between the first case 10 and the second case 20.

[0013] As shown in FIGS. 2 to 6, the clothing fan 1 of the first embodiment includes a housing 2 and a fan main body 3. As shown in FIGS.

[0014] 2, the housing 2 is a hollow member having a first case 10 formed with an inlet 11 for drawing in air (outside air), and a second case 20 formed with an outlet 21 for discharging air. The inlet 11 and the outlet 21 face each other, and hereinafter, the direction in which the inlet 11 and the outlet 21 face each other is referred to as the "axial direction X." Furthermore, the direction from an arbitrary reference position along the axial direction X toward the inlet 11 is indicated as a negative direction (negative value), and the direction toward the outlet 21 is indicated as a positive direction (positive value).

[0015] As shown in Figure 7, the first case 10 has a cylindrical first tubular portion 12, an intake port guard portion 13 that covers the intake port 11, and a pressing portion 14 formed on the first tubular portion 12.

[0016] The first cylindrical portion 12 is a cylindrical member that is open at both ends. The suction port 11 is formed by an opening at one end of the first cylindrical portion 12. The first cylindrical portion 12 is screwed into a second cylindrical portion 22 of a second case 20 (described later) from a tip 12a of the other end. A first screw portion 15 is formed on the outer circumferential surface of the first cylindrical portion 12.

[0017] The length L1 (see FIG. 6) of the first cylindrical portion 12 in the axial direction X is set to 10 mm here. Note that the length L1 is the axial length of the outer circumferential surface of the first cylindrical portion 12 and does not include the thickness of the pressing portion 14. In other words, the length L1 is the axial length of the portion of the first cylindrical portion 12 that is screwed into the second cylindrical portion 22. A shorter length L1 is preferable, but the length must be long enough to form the first screw portion 15 that can fix the first cylindrical portion 12 to the second cylindrical portion 22. Therefore, specifically, the length L1 is preferably set to 10 mm or more.

[0018] Suction port guard 13 prevents foreign objects such as fingers from entering the interior of housing 2 through suction port 11. As shown in Figures 3, 7, etc., suction port guard 13 has central support 13a, multiple suction-side rail members 13b, and multiple connecting rail members 13c. Suction port guard 13 is disposed perpendicular to axial direction X and is formed flat relative to suction port 11 (see Figure 6).

[0019] The central support portion 13a is a disk-shaped member disposed at the center of the air inlet 11. When viewed along the axial direction X, the central support portion 13a is set to have approximately the same size as an electric motor 34 of the fan body 3, which will be described later.

[0020] The multiple suction-side rail members 13b are annular members formed between the opening edge 11a of the suction port 11 and the central support portion 13a. The first case 10 of the first embodiment has three suction-side rail members 13b. The suction-side rail members 13b are arranged concentrically around the center of the suction port 11.

[0021] The multiple connecting rail members 13c are rod-shaped members that connect the central support portion 13a and the multiple suction-side rail members 13b to the first tubular portion 12. Each connecting rail member 13c spans between the opening edge 11a of the suction port 11 and the suction-side rail members 13b, between the suction-side rail members 13b, or between the suction-side rail members 13b and the central support portion 13a. When viewed along the axial direction X, the multiple connecting rail members 13c are formed at regular intervals in the circumferential direction around the center of the suction port 11. Furthermore, the connecting rail members 13c are arranged so as to be discontinuous in the radial direction from the center of the suction port 11 (see FIG. 3).

[0022] The pressing portion 14 is a flange-shaped plate member that protrudes from the opening edge 11a of the suction port 11 to the outside of the housing 2. The pressing portion 14 is formed around the entire circumference of the first cylindrical portion 12. The width (the length of protrusion from the outer peripheral surface of the first cylindrical portion 12) and thickness of the pressing portion 14 can be set as desired. In addition, the outer shape of the pressing portion 14, when viewed along the axial direction X, is a substantially regular hexagon.

[0023] As shown in FIGS. 2 and 8, the second case 20 has a cylindrical second tube portion 22, a discharge port guard portion 23 that covers the discharge port 21, and a finger hook portion 24.

[0024] The second cylindrical portion 22 is a cylindrical member that is open at both ends. The discharge port 21 is formed by an opening at one end of the second cylindrical portion 22, and the first cylindrical portion 12 is screwed into the opening at the other end of the second cylindrical portion 22. A second screw portion 25 is formed on the inner circumferential surface of the second cylindrical portion 22. The second screw portion 25 is coupled to the first screw portion 15 when the first cylindrical portion 12 is screwed into the second cylindrical portion 22. As shown in FIG. 2, the second screw portion 25 is divided into multiple portions in the circumferential direction of the second cylindrical portion 22.

[0025] Furthermore, when the first tubular portion 12 is screwed in, the tip 22a of the other end of the second tubular portion 22 faces the pressing portion 14 of the first case 10. The garment 100 is sandwiched between the tip 22a of the second tubular portion 22 and the pressing portion 14 (see FIG. 5).

[0026] The length L2 (see FIG. 6) of the second tubular portion 22 in the axial direction X is set to 22 mm here. The length L2 is the axial length from the tip 22a of the second tubular portion 22 that contacts the clothing 100 to the opening edge 21a of the discharge port 21. The length L2 is set taking into consideration the length of the blade member 32 in the axial direction X and the axial position of the blade member 32.

[0027] Furthermore, the diameter of the clothing fan 1 of the first embodiment can be determined by the outer diameter of the second case 20, but can be set arbitrarily depending on the type of clothing 100, the required amount of airflow, and the like.

[0028] The outlet guard portion 23 prevents foreign objects such as fingers from getting into the housing 2 through the outlet 21. As shown in Figures 4, 8, etc., the outlet guard portion 23 has a motor housing portion 23a, a plurality of outlet-side rail members 23b, a plurality of connecting rail members 23c, and a connector housing portion 23d. The outlet guard portion 23 is formed further outward in the axial direction X than the outlet 21 (see Figures 5 and 6). In other words, when viewed from the side, the outlet guard portion 23 bulges outward in the axial direction X than the opening edge 21a of the outlet 21.

[0029] Here, the protrusion length L2' (see FIG. 6) of the outlet guard portion 23 from the opening edge 21a of the outlet 21 can be set arbitrarily, and is set to 7.9 mm in Example 1. If L2' is short, the length of the housing 2 in the axial direction X can be shortened, allowing the garment fan 1 to be made thinner. However, the distance between the housing 2 and the blade members 32 becomes short, which may cause pressure loss and reduce the airflow. On the other hand, if L2' is long, the gap between the housing 2 and the blade members 32 can be made larger, suppressing pressure loss and reducing the airflow. However, an increase in the length of the housing 2 in the axial direction X can cause an uncomfortable fit (for example, the garment fan 1 touching the wearer's body).

[0030] Motor storage section 23a is a cylindrical recess large enough to store electric motor 34, which will be described later, and is formed in the center of discharge port 21. Motor storage section 23a is recessed toward the inside of housing 2, has flat closed surface 23e facing suction port 11, and is open toward the outside of housing 2. A through hole 23f is formed in the center of closed surface 23e.

[0031] The multiple discharge-side rail members 23b are rod-shaped members that span between the opening edge 21a of the discharge port 21 and the motor housing portion 23a. Each discharge-side rail member 23b extends radially from the center of the discharge port 21. When viewed along the axial direction X, the multiple discharge-side rail members 23b are arranged at regular intervals along the circumferential direction centered on the center of the discharge port 21 (see FIG. 4).

[0032] 4 and 5, each discharge-side rail member 23b extends from the peripheral edge of the motor housing portion 23a in a direction perpendicular to the axial direction X and has a bent portion 23g at a midpoint that bends toward the opening edge 21a of the discharge port 21. Between the bent portion 23g and the opening edge 21a of the discharge port 21, each discharge-side rail member 23b extends substantially along the axial direction X.

[0033] The multiple connecting rail members 23c are rod-shaped members that are bridged between the discharge-side rail members 23b. When viewed along the axial direction X, each connecting rail member 23c is formed so as to be continuous along the circumferential direction centered on the center of the discharge port 21. Furthermore, each connecting rail member 23c is disposed at regular intervals in the radial direction from the center of the discharge port 21 between the bent portion 23g and the motor housing portion 23a.

[0034] The connector accommodating portion 23d is a recess large enough to accommodate the power connector 33, which will be described later, and is formed adjacent to the motor accommodating portion 23a. The connector accommodating portion 23d is in communication with the motor accommodating portion 23a and is formed so that a harness 35 that electrically connects the electric motor 43 and the power connector 33 can be routed therein. As shown in Fig. 4, the connector accommodating portion 23d is disposed in an area inside the second tubular portion 22 (an area overlapping with the discharge port 21) when viewed along the axial direction X.

[0035] The finger hook 24 is an annular member formed on the outer circumferential surface of the second tubular portion 22. The finger hook 24 of the first embodiment is composed of a flange-shaped plate portion 24a and a ring portion 24b (see FIG. 6). The plate portion 24a protrudes from the housing 2 from a midpoint in the axial direction X of the second tubular portion 22 and is provided around the entire circumference of the second tubular portion 22. The ring portion 24b extends from the tip of the plate portion 24a toward the other end of the second tubular portion 22 (the opening into which the first tubular portion 12 is screwed). The outer circumferential surface of the ring portion 24b is formed with a plurality of recesses 24c recessed in an arc shape extending radially inward (see FIG. 8). The recesses 24c are arranged at regular intervals around the entire circumference of the ring portion 24b. The recesses 24c are used by the user to grip the second case 20 with their fingers when wearing the clothing fan 1.

[0036] As shown in FIG. 2, the fan body 3 includes a motor mechanism 31 and a blade member 32.

[0037] The motor mechanism 31 is composed of an electrical connector 33 that is connected to a battery (not shown), an electric motor 34 that is driven by power supplied from the battery, and a harness 35 that electrically connects the electrical connector 33 and the electric motor 34.

[0038] The power connector 33 is housed in the connector housing 23d of the outlet guard 23. The electric motor 34 is housed in the motor housing 23a of the outlet guard 23. The electric motor 34 is a DC brushless motor. A DC brushless motor is a DC motor that uses a direct current power source to rotate a rotating shaft 34a, but does not have brushes that rotate the rotating shaft 34a in a fixed direction in combination with a commutator. That is, the electric motor 34 of the first embodiment controls the rotation of the rotating shaft 34a using an electronic circuit without using a commutator or brushes. The rotating shaft 34a of the electric motor 34 protrudes from a through hole 23f formed in the motor housing 23a. The harness 35 is routed between the motor housing 23a and the connector housing 23d and is housed inside the outlet guard 23.

[0039] A motor cap 26 that integrally covers the motor housing portion 23 a and the connector housing portion 23 d is attached to the second case 20 of the first embodiment. By attaching the motor cap 26 to the second case 20, the motor mechanism 31 is protected by the motor cap 26 and the second case 20.

[0040] As shown in FIGS. 9 to 11, the blade member 32 is composed of a cylindrical hub and a plurality of (here, five) blades 37 fixed to the circumferential surface of the hub .

[0041] The hub 36 has a cylindrical shaft barrel 36a surrounding the electric motor 34 and a shaft end surface 36b that closes one end of the shaft barrel 36a and faces the suction port 11. The other end of the shaft barrel 36a is open. The hub 36 is fitted over the motor housing 23a with a gap therebetween, and the rotating shaft 34a of the electric motor 34 protruding from the through-hole 23f is connected to a rotating shaft mounting portion 36c formed in the center of the shaft end surface 36b. As a result, the hub 36 rotates in conjunction with the rotation of the rotating shaft 34a, and the multiple blades 37 rotate integrally. Note that the blade member 32 of the first embodiment rotates counterclockwise when viewed along the axial direction X from the suction port 11 side, as indicated by the arrows in FIGS. 9 to 11.

[0042] As shown in FIG. 9, multiple (here, five) blades 37 are attached at regular intervals to the outer circumferential surface of the shaft barrel 36a. Each blade 37 is attached such that its root portion 37a, located radially inside, and its chord portion 37b, located radially outside, are inclined relative to the axial direction X. Each blade 37 has the same projected area as viewed in the axial direction X, the same chord length Lα, and the same pitch angle θ. The "projected area" refers to the area of ​​the projected region of the blade 37 as viewed in the axial direction X. The "chord length Lα" refers to the length of the chord portion 37b along the rotation direction (see FIG. 10). The "pitch angle θ" refers to the angle between the chord and the plane of rotation of each blade 37 (a plane perpendicular to the axial direction X). The "chord" refers to a straight line connecting the upstream end and downstream end of the blade 37 (e.g., the root-side upstream end 38a and the root-side downstream end 38b). The pitch angle θ is set to gradually decrease from the root portion 37a of the blade 37 toward the chord portion 37b.

[0043] Furthermore, the root portion 37a of each blade 37 has a root-side upstream end 38a, which is the most upstream portion in the rotation direction, attached to a position near the axial end surface 36b, and a root-side downstream end 38b, which is the most downstream portion in the rotation direction, attached to a position near the opening of the shaft body portion 36a. When viewed from the side, as shown in Figures 6 and 11, at least a portion of each blade 37 (upstream edge 39a of blade 37) protrudes toward the suction port 11 beyond the axial end surface 36b. In other words, the axial end surface 36b of the hub 36 is recessed toward the electric motor 34 beyond the upstream edge 39a of each blade 37.

[0044] The "upstream edge 39a of the blade 37" is the region between the root-side upstream end 38a and the chord-side upstream end 38c. The "chord-side upstream end 38c" is the most upstream part of the chord portion 37b in the direction of rotation.

[0045] In the clothing fan 1 of Example 1, the diameter R1 of the shaft body 36a is set to 33.0 mm, the diameter R2 of the blade member 32 is set to 84.0 mm, and the ratio of the diameter R1 to the diameter R2 is set to 39.2%. A larger diameter R2 is advantageous for increasing the volume of air discharged from the clothing fan 1. However, increasing the diameter R2 brings the blade member 32 closer to the housing 2, increasing pressure loss and reducing the volume of air. Furthermore, to prevent an increase in pressure loss, it is necessary to ensure a large distance between the blade member 32 and the housing 2, which requires a larger inner diameter of the housing 2. However, this increases the size of the clothing fan 1, which may be a nuisance to the wearer or may make it impossible to attach to clothing 100 with an existing opening 102.

[0046] Therefore, in order to prevent an increase in the inner diameter dimension of the housing 2 and to prevent a decrease in air volume, it is desirable that the ratio of the diameter R1 of the barrel portion 36a to the diameter R2 of the blade member 32 be less than 40%. In other words, it is desirable that the relationship in length between the diameter R1 of the barrel portion 36a and the diameter R2 of the blade member 32 satisfy the following formula (1). R1 / R2×100<40(%) (1)

[0047] In the case of the clothes fan 1 of Example 1, since the diameter R2 of the blade member 32 is set to 84.0 mm, it is desirable that the diameter R1 of the shaft body 36a be less than 33.6 mm. However, if the diameter R2 of the blade member 32 can be set to 84.0 mm or more, the diameter R1 of the shaft body 36a can be set to 33.6 mm or more.

[0048] The "diameter R1 of the shaft trunk portion 36a" is the outer diameter of the shaft trunk portion 36a when the blade member 32 is viewed along the axial direction X, as shown in Fig. 10. The "diameter R2 of the blade member 32" is the diameter of the locus K of the chord portion 37b of each blade 37 when the blade member 32 is viewed along the axial direction X, as shown in Fig. 10.

[0049] In the clothes fan 1 of Example 1, the axial length L3 of each blade 37 is set to 17.9 mm, the axial length L4 of the housing 2 is set to 35 mm, and the ratio of length L3 to length L4 is set to 51.1%. That is, length L3 is set to 51.1% of length L4. Here, if the ratio of length L3 to length L4 is greater than 60%, the blades 37 will be too close to the housing 2, increasing pressure loss and resulting in a decrease in airflow. On the other hand, if the ratio of length L3 to length L4 is less than 45%, the axial length L4 of the housing 2 will be too long, resulting in an increase in the size of the housing 2. Furthermore, if the axial length L3 of the blades 37 is too short, the projected area and pitch angle θ of each blade 37 will be small, and a sufficient amount of air will not be able to be discharged. Therefore, it is desirable to set the ratio of the axial length L3 of the blades 37 to the axial length L4 of the housing 2 to 45% to 60% (45% or more and 60% or less).

[0050] In the case of the clothes fan 1 of the first embodiment, since the axial length L4 of the housing 2 is set to 35 mm, it is desirable to set the axial length L3 of the blades 37 to 15.75 mm to 21.0 mm. Note that the axial length L4 of the housing 2 is not limited to 35 mm, and the preferable range of the axial length L3 of the blades 37 varies depending on the axial length L4 of the housing 2.

[0051] As shown in Fig. 11, "axial length L3 of blade 37" is the length along the axial direction X of each blade 37. As shown in Fig. 6, "axial length L4 of housing 2" is the maximum length from the outer surface of inlet guard portion 13 to the outer surface of outlet guard portion 23. Length L4 does not include the portion of motor cap 26 that protrudes from outlet guard portion 23.

[0052] Furthermore, in the clothes fan 1 of the first embodiment, the blade member 32 is supported by the second case 20, but depending on the position of the opening edge 21a of the outlet 21 in the axial direction X, the downstream edge 39b of the blade 37 moves relatively away from or closer to the outlet 21. Here, the "downstream edge 39b of the blade 37" is the region between the root-side downstream end 38b and the chord-side downstream end 38d. The "chord-side downstream end 38d" is the most downstream portion of the chord portion 37b in the direction of rotation.

[0053] Therefore, in the clothes fan 1 of the first embodiment, the position of the opening edge 21a of the outlet 21 in the axial direction X is set within a predetermined range A (see FIG. 6) along the axial direction X based on the chord-side downstream end 38d of the blade 37. In the clothes fan 1 of the first embodiment, the "predetermined range A" is defined based on the rate of decrease from the maximum value of the air volume discharged from the housing 2.

[0054] In other words, in the clothing fan 1 of Example 1, the distance Lx (see Figure 6) in the axial direction X from the chord-side downstream end 38d to the opening edge 21a of the discharge port 21 falls within a predetermined range A defined based on the rate of decrease from the maximum discharged air volume.

[0055] Specifically, in the clothes fan 1 of Example 1, the reduction rate is set to approximately 3% (a reduction rate at which the reduction in airflow from the maximum value is approximately 2 L / s), and the predetermined range A is defined as a range of 2 mm from the chord-side downstream end 38d toward the inlet 11 and 2 mm from the chord-side downstream end 38d toward the outlet 21. That is, in the clothes fan 1 of Example 1, the position of the opening edge 21a of the outlet 21 in the axial direction X is set within the range A defined by 2 mm toward the inlet 11 and the outlet 21, respectively, with the chord-side downstream end 38d as the reference (zero mm). Therefore, in the clothes fan 1 of Example 1, the distance Lx in the axial direction X from the chord-side downstream end 38d of the blade 37 to the opening edge 21a of the outlet 21 is a maximum of 2 mm.

[0056] The "rate of decrease from the maximum air volume discharged from the clothes fan 1" set when defining the above-mentioned "predetermined range A" can be set arbitrarily, but a small value is preferable. Also, the size of the predetermined range A becomes narrower as the "rate of decrease from the maximum air volume discharged from the clothes fan 1" becomes smaller.

[0057] Therefore, it is preferable that the "predetermined range A" be set to a range of 2 mm or less from the chord-side downstream end 38d toward the inlet 11 along the axial direction X, and 2 mm or less from the chord-side downstream end 38d toward the outlet 21 along the axial direction X, in accordance with the arbitrarily set "rate of decrease from the maximum air volume discharged from the clothes fan 1." For example, the "predetermined range A" may be set to 1.2 mm or less from the chord-side downstream end 38d toward the inlet 11 and the outlet 21, respectively, with the chord-side downstream end 38d as the reference (zero mm).

[0058] Furthermore, in the clothes fan 1 of the first embodiment, the "decrease rate from the maximum air volume discharged from the clothes fan 1" may be set to zero percent, and the "predetermined range A" may be defined as zero mm toward the inlet 11 and zero mm toward the outlet 21, with the position of the chord-side downstream end 38d in the axial direction X as the reference (zero mm). In this case, the position of the opening edge 21a of the outlet 21 in the axial direction X coincides with the position of the chord-side downstream end 38d in the axial direction X.

[0059] In addition, in the clothes fan 1 of Example 1, as shown in FIG. 12, when viewed in a cross section (cross section BB in FIG. 3) along the axial direction X that passes through the circumferential center position of the chord portion 37b of the blade 37 and the rotation center of the blade member 32 (the rotation shaft 34a of the electric motor 34), the tip 12a of the first tubular portion 12 on the discharge port 21 side is set at a position closer to the inlet 11 than the blade tip 37c at the circumferential center position of the chord portion 37b of the blade 37.

[0060] Here, the "circumferential center position of the chord portion 37b of the blade 37" is the position β where the chord length Lα is halved in the circumferential direction, as shown in Figure 10. Also, the "blade tip 37c at the circumferential center position of the chord portion 37b" is the portion of the chord portion 37b at position β. Hereinafter, the "circumferential center position of the chord portion 37b" will simply be referred to as the "center of the chord portion 37b" or the "center position of the chord portion 37b."

[0061] In Example 1, when the clothing fan 1 is not attached to the clothing 100, that is, when the tip 22a of the second tubular portion 22 is in contact with the presser portion 14 (see FIG. 12), the tip 12a on the outlet 21 side of the first tubular portion 12 is set to a position 3 mm closer to the inlet 11 than the impeller tip 37c. That is, in the clothing fan 1 of Example 1, when not attached to the clothing 100, the distance Lβ along the axial direction X from the impeller tip 37c at the center of the chord portion 37b to the tip 12a of the first tubular portion 12 is set to −3 mm.

[0062] Furthermore, in the clothing fan 1 of Example 1, if the absolute value of the distance Lβ along the axial direction X from the blade tip 37c at the center of the chord portion 37b to the tip 12a of the first tubular portion 12 is too large, it may be impossible to form, for example, the first thread portion 15. Therefore, it is desirable that the absolute value of the distance Lβ be 3 mm or less when the clothing fan 1 is not attached to the clothing 100.

[0063] Furthermore, when the clothing fan 1 is attached to the clothing 100, the back portion 101 of the clothing 100 is sandwiched between the tip 22a of the second tubular portion 22 and the retainer portion 14 (see FIG. 5). Therefore, when the clothing fan 1 is attached to the clothing 100, the tip 12a of the first tubular portion 12 is farther away from the blade tip 37c than when the clothing fan 1 is not attached to the clothing 100. As a result, even when the clothing fan 1 is attached to the clothing 100, the tip 12a of the first tubular portion 12 remains positioned closer to the air inlet 11 than the blade tip 37c.

[0064] The operation of the clothing fan 1 of the first embodiment will be described below.

[0065] When fan body 3 of clothes fan 1 is driven, air flows into housing 2 from inlet 11 and is discharged from outlet 21. In other words, the driving force of fan body 3 causes air to flow from inlet 11 toward outlet 21.

[0066] On the other hand, the pressure distribution around the blade 37 varies depending on the positional relationship in the axial direction X between the chord-side downstream end 38d of the blade 37 and the opening edge 21a of the discharge port 21, as shown in FIG.

[0067] Note that the "suction side pressure value" in Figure 13 is a simulated pressure value at a predetermined position between the suction port 11 and the downstream edge 39b of the blade 37. Also, the "discharge side pressure value" in Figure 13 is a simulated pressure value around the opening edge 21a of the discharge port 21. Also, the "pressure difference" in Figure 13 is the difference between the suction side pressure value and the discharge side pressure value (the absolute value of the value obtained by subtracting the discharge side pressure value from the suction side pressure value). Note that a negative pressure value indicates negative pressure, and the larger the value, the lower the pressure.

[0068] 13 is a clothes fan in which the position of opening edge 21a of discharge port 21 in the axial direction X is shifted 3 mm toward suction port 11 from chord-side downstream end 38d of blade 37, as shown in Fig. 14A. That is, in the first prototype clothes fan, distance Lx along the axial direction X from chord-side downstream end 38d to opening edge 21a of discharge port 21 is set to -3 mm.

[0069] 13 is a clothing fan in which the position in the axial direction X of the opening edge 21a of the discharge port 21 coincides with the position in the axial direction X of the chord-side downstream end 38d of the blade 37, as shown in Fig. 14B. That is, in the second prototype clothing fan, the distance Lx along the axial direction X from the chord-side downstream end 38d to the opening edge 21a of the discharge port 21 is set to zero mm.

[0070] 13 is a clothes fan in which the position of opening edge 21a of discharge port 21 in the axial direction X is shifted 3 mm toward discharge port 21 from chord-side downstream end 38d of blade 37, as shown in Fig. 14C. That is, in the third prototype clothes fan, distance Lx along the axial direction X from chord-side downstream end 38d to opening edge 21a of discharge port 21 is set to +3 mm.

[0071] The first, second, and third prototype clothing fans have similar configurations except for the relationship between the axial position of the chord-side downstream end 38d and the axial position of the opening edge 21a of the discharge port 21.

[0072] Generally, air tends to flow from a high-pressure region to a low-pressure region. Therefore, from the pressure distribution around the blades shown in Figure 13, it can be seen that a pressure difference occurs inside the housing 2, causing air to flow from the discharge port 21 toward the suction port 11. However, the air flow caused by this pressure difference creates resistance to the air flow from the suction port 11 toward the discharge port 21 caused by the driving force of the fan body 3. Moreover, this resistance increases as the pressure difference between the suction-side pressure value and the discharge-side pressure value increases, resulting in an obstruction to smooth airflow.

[0073] 13, it is clear that the closer the axial direction X position of opening edge 21a of discharge port 21 is to the axial direction X position of chord-side downstream end 38d of blade 37, the smaller the pressure difference between the suction-side pressure value and the discharge-side pressure value can be. In other words, it was found that when the axial direction X position of opening edge 21a of discharge port 21 coincides with the axial direction X position of chord-side downstream end 38d, resistance to the airflow from suction port 11 to discharge port 21 can be most suppressed.

[0074] As shown in Figure 15, the second prototype clothing fan produced a simulated airflow of approximately 100 L / s. The first prototype clothing fan produced a simulated airflow of approximately 95 L / s. The third prototype clothing fan also produced a simulated airflow of approximately 95 L / s.

[0075] 15, when the axial direction X position of the opening edge 21a of the discharge port 21 coincides with the axial direction X position of the chord side downstream end 38d (the distance Lx along the axial direction X from the chord side downstream end 38d to the opening edge 21a of the discharge port 21 is zero mm: second prototype), the air volume is at its maximum. On the other hand, when the axial direction X position of the opening edge 21a of the discharge port 21 deviates along the axial direction X from the axial direction X position of the chord side downstream end 38d as a reference, the air volume decreases below the maximum value regardless of the direction of the deviation.

[0076] 16 shows the relationship between the measured value of the air volume discharged from the clothes fan 1 and the distance from the chord-side downstream end 38d to the opening edge 21a of the outlet 21. As is clear from FIG. 16, when the clothes fan 1 is viewed from the side, the air volume is maximum when the axial distance X from the chord-side downstream end 38d of the blade 37 to the opening edge 21a of the outlet 21 is zero mm, that is, when the axial position X of the opening edge 21a of the outlet 21 coincides with the axial position X of the chord-side downstream end 38d. Furthermore, the air volume discharged from the clothes fan 1 decreases as the axial position X of the opening edge 21a of the outlet 21 deviates from the chord-side downstream end 38d along the axial direction X (as the absolute value of the axial distance X from the chord-side downstream end 38d to the opening edge 21a of the outlet 21 increases).

[0077] Furthermore, the volume of air discharged from the clothing fan 1 is reduced from the maximum value whether the position of the opening edge 21a of the outlet 21 in the axial direction X is shifted toward the inlet 11 side or toward the outlet 21 side relative to the position of the chord-side downstream end 38d in the axial direction X.

[0078] In this way, in the clothing fan 1, the air volume is at its maximum when the axial direction X position of the opening edge 21a of the outlet 21 coincides with the axial direction X position of the chord-side downstream end 38d when viewed from the side, and the air volume decreases as the axial direction X position of the opening edge 21a of the outlet 21 deviates from the axial direction X position of the chord-side downstream end 38d.

[0079] From the above, it is clear from the simulated airflow results shown in FIG. 15 and the measured airflow values ​​shown in FIG. 16 that by bringing the position of opening edge 21 a of outlet 21 in the axial direction X closer to the position of chord-side downstream end 38 d in the axial direction X, it is possible to reduce the pressure difference between the suction-side pressure value and the discharge-side pressure value without increasing the axial dimension of housing 2, and thereby suppress a decrease in the airflow of clothes fan 1.

[0080] As described above, in the clothes fan 1 of the first embodiment, as shown in Fig. 6, the position of the opening edge 21a of the discharge port 21 in the axial direction X is set within a predetermined range A (see Fig. 6) along the axial direction X based on the chord-side downstream end 38d. Therefore, in the clothes fan 1 of the first embodiment, the position of the opening edge 21a of the discharge port 21 in the axial direction X can be kept within the predetermined range A based on the chord-side downstream end 38d. As a result, the clothes fan 1 of the first embodiment can improve the air-blowing capacity as shown in Figs. 15 and 16 while suppressing an increase in the axial dimension of the housing 2.

[0081] In the clothes fan 1 of the first embodiment, the position of the opening edge 21a of the outlet 21 in the axial direction X may coincide with the position of the chord-side downstream end 38d in the axial direction X. In this case, the clothes fan 1 can maximize the amount of air discharged.

[0082] In addition, in the clothing fan 1 of Example 1, the “predetermined range A” for setting the axial direction X of the opening edge 21a of the outlet 21 is defined based on the rate of decrease from the maximum air volume discharged from the housing 2.

[0083] Thus, in the clothes fan 1 of the first embodiment, the rate at which the air volume decreases from its maximum value can be controlled by adjusting the position of the opening edge 21a of the outlet 21 in the axial direction X.

[0084] In the clothes fan 1 of the first embodiment, the "predetermined range A" is specifically defined as a range of 2 mm toward the inlet 11 and 2 mm toward the outlet 21, based on the position of the chord-side downstream end 38d in the axial direction X. This allows the clothes fan 1 of the first embodiment to limit the decrease in the air volume discharged from the housing 2 to approximately 2 L / s from the maximum value.

[0085] That is, in the clothing fan 1 of Example 1, by defining the "predetermined range A" to be 2 mm or less from the chord-side downstream end 38d toward the inlet 11, and 2 mm from the chord-side downstream end 38d toward the outlet 21, the reduction in the air volume discharged from the housing 2 can be kept within approximately 2 L / s of the maximum value.

[0086] In the clothes fan 1 of the first embodiment, a hub 36 is attached to the electric motor 34. The hub 36 has a cylindrical shaft body 36a that surrounds the electric motor 34 and a shaft end face 36b that closes one end of the shaft body 36a and faces the air inlet 11. A plurality of blades 37 are provided at regular intervals on the outer circumferential surface of the shaft body 36a, and at least some of the blades protrude toward the air inlet 11 beyond the shaft end face 36b.

[0087] As a result, the clothes fan 1 of Example 1 can increase the amount of air discharged and improve the air blowing capacity compared to the clothes fan of the comparative example, as shown in FIG.

[0088] The clothes fan of the comparative example has a configuration in which the shaft end surface 36b of the hub 36 protrudes toward the air inlet 11 more than the plurality of blades 37 that are provided at regular intervals on the outer peripheral surface of the shaft body 36a. In other words, in the clothes fan of the comparative example, the blades 37 do not protrude toward the air inlet 11 more than the shaft end surface 36b of the hub 36. The clothes fan of the comparative example has the same configuration as the clothes fan 1 of Example 1, except for the configuration in which the shaft end surface 36b protrudes toward the air inlet 11 more than the blades 37.

[0089] In the clothes fan 1 of the first embodiment, a hub 36 is attached to the electric motor 34. The hub 36 has a cylindrical shaft body 36a that surrounds the electric motor 34 and a shaft end surface 36b that closes one end of the shaft body 36a and faces the air inlet 11. A plurality of blades 37 are provided at regular intervals on the outer peripheral surface of the shaft body 36a. The ratio of the diameter R1 of the shaft body 36a to the diameter R2 of the blade member 32 formed by the hub 36 and the plurality of blades 37 is set to be less than 40%.

[0090] Here, if the diameter R2 is increased, the distance between the blade members 32 and the housing 2 becomes shorter, which increases pressure loss and reduces the airflow. Furthermore, if the inner diameter of the housing 2 is increased to ensure a large distance between the blade members 32 and the housing 2, the clothes fan 1 becomes larger. By setting the ratio of the diameter R1 of the shaft body 36a to the diameter R2 of the blade members 32 to less than 40%, the clothes fan 1 of Example 1 can prevent an increase in the inner diameter of the housing 2 and a decrease in the airflow.

[0091] In the clothes fan 1 of the first embodiment, the ratio of the length L3 in the axial direction X of the blades 37 to the length L4 in the axial direction X of the housing 2 is set to be 45% or more and 60% or less. If the ratio of length L3 to length L4 is greater than 60%, pressure loss increases, resulting in a decrease in airflow. On the other hand, if the ratio of length L3 to length L4 is less than 45%, the housing 2 becomes too large, or the blade angle and wing area of ​​the blades 37 become too small, making it impossible to discharge a sufficient amount of air. Therefore, in the clothes fan 1 of the first embodiment, it is possible to suppress a decrease in airflow while suppressing an increase in the length L4 in the axial direction X of the housing 2.

[0092] In the clothes fan 1 of the first embodiment, the second case 20 has a motor housing portion 23a capable of housing the electric motor 34 and a connector housing portion 23d capable of housing the current-carrying connector 33 connected to the electric motor 34. The connector housing portion 23d is formed in an area inside the second cylindrical portion 22 when viewed along the axial direction X.

[0093] As a result, in the clothing fan 1 of Example 1, the electrical connector 33 is not positioned so as to protrude into an area outside the outer peripheral surface of the second tubular portion 22, and the electrical connector 33 is prevented from interfering with objects around the clothing fan 1, causing malfunctions or becoming a nuisance.

[0094] In the clothes fan 1 of the first embodiment, the electric motor 34 is configured as a DC brushless motor. This makes it possible to suppress an increase in the axial length of the electric motor 34, and to prevent an increase in the length L4 of the housing 2 in the axial direction X.

[0095] Example 2 Like the clothing fan 1 of the first embodiment, the clothing fan 1A of the second embodiment is detachably attached to clothing 100 (see FIG. 1) and sends air (outside air) into the interior of the clothing 100 to cool the wearer's body.

[0096] As shown in Fig. 18, the clothes fan 1A of Example 2 differs from the housing 2 of Example 1 in the configuration of part of the housing 2A. Since the clothes fan 1A of Example 2 is similar to the clothes fan 1 of Example 1 in configuration other than the housing 2A, the same reference numerals as in Example 1 are used and detailed descriptions are omitted. In addition, in the configuration of the housing 2A, the same components as the housing 2 of Example 1 are used and detailed descriptions are omitted.

[0097] The housing 2A of the second embodiment has a first case 10A in which an inlet 11 is formed, and a second case 20A in which an outlet 21 is formed. In the second embodiment, the direction in which the inlet 11 and the outlet 21 face each other is also defined as the "axial direction X."

[0098] As shown in Figure 18, the first case 10A has a cylindrical first tubular portion 12A, an intake port guard portion 13 that covers the intake port 11, and a pressing portion 14 formed on the first tubular portion 12A.

[0099] The first cylindrical portion 12A is a cylindrical member that is open at both ends, with the opening at one end forming the suction port 11, and the tip 12a at the other end being screwed into the second cylindrical portion 22A of the second case 20A. A first screw portion 15A is formed on the outer peripheral surface 12b of the first cylindrical portion 12A.

[0100] 19, first screw portion 15A is a male screw formed by a protrusion spirally surrounding outer circumferential surface 12b of first tubular portion 12. First screw portion 15A has an outer diameter on the discharge port 21 side (first outer diameter R3 described later) that is larger than an inner diameter R5 of opening 102 formed in garment 100, and an outer diameter on the suction port 11 side (second outer diameter R4 described later) that is smaller than the inner diameter R5 of opening 102.

[0101] 20, the outer diameter of the first thread portion 15A at the first threaded portion from the tip 12a (referred to as "first outer diameter R3") is larger than the inner diameter R5 (see FIG. 18) of the opening 102 formed in the garment 100. The outer diameters of the second and third threaded portions from the tip 12a (referred to as "second outer diameter R4") of the first thread portion 15A are smaller than the inner diameter R5 of the opening 102.

[0102] The "first thread portion 15A from the tip 12a to the first thread start point S (see FIG. 19) of the first thread portion 15A on the tip 12a side is a 360° range in the circumferential direction of the first cylindrical portion 12A. The "first thread portion 15A from the tip 12a to the second thread start point" is a 360° range in the circumferential direction of the first cylindrical portion 12A from the end point of the first thread start point S of the first thread portion 15A. The "first thread portion 15A from the tip 12a to the third thread start point S" is a range from the end point of the second thread start point S of the first thread portion 15A to the thread start point S on the suction port 11 side. The "thread start point S" is the circumferential tip position where the thread height reaches a specified dimension from the outer peripheral surface 12b of the first cylindrical portion 12.

[0103] 20, the first thread portion 15A has a thread height H1 of the first thread on the tip 12a side that is set higher than the thread heights H2 of the second and third threads. It is preferable that the first outer diameter R3 is approximately 1 to 2 mm larger than the inner diameter R5 of the opening 102, and the second outer diameter R4 is approximately 0.5 to 1 mm smaller than the inner diameter R5 of the opening 102. If the difference between the first outer diameter R3 and the inner diameter R5 of the opening 102 is too large, the first cylindrical portion 12A cannot be inserted into the opening 102. Furthermore, if the difference between the second outer diameter R4 and the inner diameter R5 of the opening 102 is too large, the thread height H2 of the second and subsequent threads of the first thread portion 15A cannot be sufficiently ensured.

[0104] As shown in FIG. 18, the second case 20A has a cylindrical second tube portion 22A, a discharge port guard portion 23 that covers the discharge port 21, and a finger hook portion 24.

[0105] The second cylindrical portion 22A is a cylindrical member that is open at both ends, with the opening at one end forming the discharge port 21 and the opening at the other end into which the first cylindrical portion 12A is screwed. A second screw portion 25A is formed on the inner circumferential surface of the second cylindrical portion 22A.

[0106] As shown in Fig. 21, the second screw portion 25A is an internal thread formed by grooves formed between protrusions protruding from the inner peripheral surface 22b of the second cylindrical portion 22A, and couples with the first screw portion 15A when the first cylindrical portion 12A is screwed into the second cylindrical portion 22A. Here, the second screw portion 25A has a constant thread depth D1 over its entire length. Furthermore, as shown enlarged in Fig. 18, the thread depth D1 is set to a size that allows coupling with the thread height H1 of the first thread on the tip 12a side of the first screw portion 15A.

[0107] 22, the second screw portion 25A is divided into a plurality of portions (here, six portions at 60° intervals) along the circumferential direction of the second cylindrical portion 22A. Note that "60° interval" means that when viewed along the axial direction X, the angle θS formed by a straight line LS connecting the center O of the second cylindrical portion 22A and the circumferential center position of an adjacent second screw portion 25A is set to 60°.

[0108] In addition, in the circumferential direction of the second tubular portion 22A, the arc length AR1 of the continuous portion of the second screw portion 25A is shorter than the arc length AR2 of the non-threaded portion (the portion where the second screw portion 25A is not formed) that divides the second screw portion 25A.

[0109] The operation of the clothing fan 1A of the second embodiment will be described below.

[0110] In the clothing fan 1A of the second embodiment, the first case 10A and the second case 20A are separated in advance, and after the first case 10A is attached to the clothing 100, the second case 20A is fixed to the first case 10A.

[0111] At this time, first case 10A is first inserted with first tubular portion 12A from tip 12a into opening 102, and the first ridge of first screw portion 15A on the tip 12a side climbs over the edge of opening 102 and enters garment 100. Then, first case 10A is pushed in, and garment 100 fits around the second and subsequent ridges of first screw portion 15A. In this way, first case 10A is attached to garment 100.

[0112] Here, the first outer diameter R3 of the first screw portion 15A is larger than the inner diameter R5 of the opening 102. Therefore, after the first ridge on the tip 12a side of the first screw portion 15A climbs over the edge of the opening 102, if the first tubular portion 12A tries to slip out of the garment 100, the periphery of the opening 102 will catch on the first screw portion 15A. This prevents the first case 10A from spontaneously falling off the garment 100 even if it is not supported by the wearer's hands.

[0113] Furthermore, the second outer diameter R4 of the first screw portion 15A is smaller than the inner diameter R5 of the opening 102. Therefore, after the first ridge on the tip 12a side of the first screw portion 15A climbs over the opening 102, the edge of the opening 102 does not interfere with the first screw portion 15A and is not caught between the first screw portion 15A and the second screw portion 25A.

[0114] This prevents the first case 10A from falling off during installation, facilitating installation and improving workability. In the clothes fan 1A of Example 2, the first outer diameter R3 is larger than the inner diameter R5 of the opening 102, so the first case 10A must be inserted into the opening 102 at an angle with respect to the axial direction X.

[0115] The clothing fan 1 of the present invention has been described above based on Examples 1 and 2, but the specific configuration is not limited to these Examples, and design changes and additions are permitted as long as they do not deviate from the gist of the invention according to each claim.

[0116] In the clothing fan 1 of Example 1, an example has been shown in which the first case 10 is screwed into the second case 20, and the first screw portion 15 is coupled to the second screw portion 25. However, the engagement structure between the first case 10 and the second case 20 is not limited to a screw structure. For example, the first cylindrical portion 12 of the first case 10 may be press-fitted into the second cylindrical portion 22 of the second case 20, or a claw formed on the first case 10 may be caught on the second case 20, thereby engaging the first case 10 and the second case 20.

[0117] In the clothes fan 1 of the first embodiment, the outlet-side rail member 23b of the outlet guard 23 extends in a direction perpendicular to the axial direction X from the motor housing portion 23a to the bent portion 23g. This results in a flat tip of the outlet guard 23, but the shape of the outlet guard 23 is not limited to this. The outlet-side rail member 23b may be curved in a direction protruding from the outlet 21 around the motor housing portion 23a. Furthermore, the inlet guard 13 may discharge air further outside the housing 2 than the inlet 11.

[0118] In the clothing fan 1 of Example 1, the blade member 32 has five blades 37. However, the number of blades 37 can be set arbitrarily. Furthermore, the projected area, chord length Lα, pitch angle θ, etc. of each blade 37 can also be set arbitrarily.

[0119] In addition, in the clothes fan 1 of the first embodiment, an example has been shown in which the electric motor 34 is configured as a DC brushless motor. However, any motor can be used as the electric motor 34, and it may be, for example, a brushed DC motor having a commutator and brushes.

[0120] Furthermore, in Example 2, an example was shown in which the outer diameter of first screw portion 15A at the first thread from tip 12a is larger than the inner diameter R5 of opening 102, and the outer diameter of first screw portion 15A at the second thread from tip 12a onwards is smaller than the inner diameter R5 of opening 102. However, it is sufficient that the outer diameter of first screw portion 15A on the suction port 11 side is smaller than the inner diameter R5 of opening 102, and the outer diameter of first screw portion 15A on the discharge port 21 side is larger than the inner diameter R5 of opening 102.

[0121] Therefore, for example, the outer diameter of the first screw portion 15A at the first and second threads from the tip 12a of the first tubular portion 12A may be larger than the inner diameter R5 of the opening 102, and the outer diameter of the first screw portion 15A at the third thread from the tip 12a may be smaller than the inner diameter R5 of the opening 102.

[0122] In addition, in the clothing fan 1A of Example 2, an example is shown in which the first screw portion 15A formed on the first case 10A has three threads, but the number of threads on the first screw portion 15A can be set arbitrarily. [Explanation of symbols]

[0123] 1 clothing fan 2. Housing 3 Fan body 10 Case 1 11 Intake port 12 First cylinder part 12a tip 13 Suction side guard 15 First screw part 20 Case 2 21 Discharge port 22 Second cylinder part 23 Discharge side guard 23a Motor storage section 23d Connector storage area 25 Second screw part 34 Electric motor 36 Hub 36a Shaft body 36b Shaft end face 37 Feather 37b Chord section 37c Blade tip at the circumferential center of the chord 38d Chord side downstream end L1 Axial length of the first cylindrical section L2 Axial length of the second cylindrical section L3 Axial length of the blade L4 Axial length of housing Lα Chord length R1 Shaft body diameter R2 Diameter of blade member?

Claims

1. A clothing fan comprising: a hollow housing having an inlet and an outlet facing the inlet; and a fan body disposed inside the housing; the clothing fan being attached to clothing to blow air into the clothing, the housing includes a first case having a cylindrical first cylindrical portion with the suction port formed at one end thereof, and a second case having a cylindrical second cylindrical portion with the discharge port formed at one end thereof and into which the first cylindrical portion is inserted; the fan body has a plurality of blades that are rotated by an electric motor to blow air from the suction port toward the discharge port, When the direction in which the suction port and the discharge port face each other is defined as the axial direction, the position of the opening edge of the discharge port in the axial direction is set within a predetermined range based on the downstream end of the blade on the chord side. A clothing fan characterized by:

2. 2. The clothes fan according to claim 1, The axial position of the opening edge of the discharge port coincides with the axial position of the downstream end portion on the chord side. A clothing fan characterized by:

3. 2. The clothes fan according to claim 1, The predetermined range is defined based on a rate of decrease from the maximum value of the air volume discharged from the housing. A clothing fan characterized by:

4. 2. The clothes fan according to claim 1, The predetermined range is defined as a range of 2 mm or less from the downstream end on the chord side to the suction port side and 2 mm or less from the downstream end on the chord side to the discharge port side. A clothing fan characterized by:

5. The clothing fan according to any one of claims 1 to 4, a hub is attached to the electric motor, the hub having a cylindrical shaft body portion surrounding the electric motor and a shaft end surface closing one end of the shaft body portion and facing the suction port; The plurality of blades are provided at regular intervals on the outer peripheral surface of the shaft body, and at least a portion of the blades protrude toward the suction port beyond the shaft end surface. A clothing fan characterized by:

6. The clothing fan according to any one of claims 1 to 4, a hub is attached to the electric motor, the hub having a cylindrical shaft body portion surrounding the electric motor and a shaft end surface closing one end of the shaft body portion and facing the suction port; The plurality of blades are provided at regular intervals on the outer circumferential surface of the barrel portion, The ratio of the diameter of the shaft body to the diameter of the blade member formed by the hub and the plurality of blades is set to less than 40%. A clothing fan characterized by:

7. The clothing fan according to any one of claims 1 to 4, The ratio of the length of the blades in the axial direction to the length of the housing in the axial direction is set to 45% or more and 60% or less. A clothing fan characterized by:

8. The clothing fan according to any one of claims 1 to 4, the second case has a motor housing portion capable of housing the electric motor and a connector housing portion capable of housing a current-carrying connector connected to the electric motor, The connector accommodating portion is formed in an area inside the second cylindrical portion when viewed along the axial direction. A clothing fan characterized by:

9. The clothing fan according to any one of claims 1 to 4, The first cylindrical portion has a first thread portion formed on an outer circumferential surface thereof, the second cylindrical portion has an inner circumferential surface formed with a second screw portion that is coupled to the first screw portion, The first screw portion has an outer diameter on the suction port side that is smaller than an inner diameter of the opening formed in the clothing, and an outer diameter on the discharge port side that is larger than the inner diameter of the opening. A clothing fan characterized by:

Images